JP4076004B2 - Paste fuel production apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a pressurized fluidized bed boiler that burns solid fuel in a pressurized fluidized bed, drives a steam turbine with the generated steam, and further drives a gas turbine with high-pressure and high-temperature combustion gas to obtain electric power with high efficiency. It relates to a combined power plant.
[0002]
  An apparatus for producing a solid fuel and water mixture to be supplied to a pressurized fluidized bed combustion furnace and itsTo the lawRelated.
[0003]
[Prior art]
  Fuel is burned in a pressurized fluidized bed furnace, steam is generated in a heat transfer tube installed in the fluidized bed to drive the steam turbine, and the high pressure and high temperature generated in the pressurized fluidized bed boiler are driven. There is known a pressurized fluidized bed boiler combined power plant that can drive a gas turbine with combustion gas and obtain electric power with high efficiency.
[0004]
  One of the problems of the pressurized fluidized bed boiler is to supply coal particles continuously and stably in a large quantity into a pressurized fluidized bed furnace. As means for solving this problem, for example, in Japanese Patent Laid-Open No. Sho 62-155433, coal and water are mixed to form a paste-like fluid (hereinafter abbreviated as Coal-Water Paste; CWP), and the CWP is pumped. Discloses a wet feeding method in which the pressure is fed and fed from a spray nozzle into a fluidized bed furnace.
[0005]
  FIG. 20 shows a fuel production / supply system for supplying CWP to a pressurized fluidized bed furnace. Fuel coal is supplied from the raw coal bunker 1 to the coarse pulverizer 3 by the coal feeder 2, and the coarsely pulverized coal is sent to the relay hopper 4. A part of the coarsely pulverized coal is sent to the wet tube mill 5 and pulverized together with water sent from the tube mill water pump 10 to produce a pulverized coal slurry. The produced pulverized coal slurry is temporarily stored in the slurry tank 6. CWP is manufactured by supplying coal from the relay hopper 4, pulverized coal slurry from the slurry tank 6, and water from the water tank 7 to the kneader 13 and kneading. The produced CWP is stored in the CWP tank 14, is pumped to the CWP transport pipe 19 by the piston pump 15, and is supplied to the pressurized fluidized bed (not shown) via the CWP nozzle 21.
[0006]
  The piston pump 15 for supplying the CWP to the pressurized fluidized bed is driven by the hydraulic pressure of the piston pump hydraulic device 17, and the CWP is sent from the CWP tank 14 through the suction port 16 to the piston pump 15 and sent to the CWP transport pipe 19. The Water can be injected into the suction port 16 of the piston pump 15 by the water injection water pump 12 and the injection pipe 22, and pulverized coal slurry can also be injected from the injection slurry pump 9 and the injection pipe 22. The piston pump hydraulic device 17 includes a hydraulic pressure gauge 18 that detects the hydraulic pressure of the piston pump 15. The CWP transport pipe 19 has a pressure gauge 20 and detects the internal pressure of the CWP transport pipe 19 during CWP pumping.
[0007]
  Moisture content of raw coal, moisture content of pulverized coal slurry produced by wet tube mill 5 and water pump 11 for kneaderwaterThe amount of water to be supplied is set so that the total amount becomes the water content of CWP. The water content of CWP produced by the kneading machine 13 is set to a minimum water content necessary for pumping with the piston pump 15.
[0008]
  In the production of the CWP, it is important to reduce the amount of water added to coal as much as possible in order to maintain the power generation efficiency of the boiler plant at a high level. For this reason, CWP in which the amount of water added to coal is limited has a high viscosity, and since the chemical for dispersing coal particles is not added to reduce the production cost, the fluidity is extremely poor. Furthermore, since CWP coal has a maximum diameter of 6 to 10 mm, an average diameter of 1 to 2 mm, and a coarse particle size, a particle size configuration including an appropriate amount of fine particles is required to obtain CWP having a low moisture content. That is, the coal particles in CWP are characterized by existing in a wide particle size range from fine particles of several tens of microns to coarse particles of about 10 mm at the maximum.
[0009]
  In order to produce a stable CWP under the above-described constraints, it is desirable to adjust the viscosity of the CWP to a range of 5 to 20 Pa · s. This is because when the viscosity of the CWP is 20 Pa · s or more, the suction port of the piston pump 15 is clogged by CWP, and the pump cannot be transported. The viscosity of CWP is mainly correlated with the coal concentration and particle size composition in CWP.
[0010]
  That is, when the coal concentration is high, the viscosity of CWP increases. Conversely, when the coal concentration is low, the concentration of CWP decreases. Also, the viscosity increases as the particle size becomes finer. Therefore, in order to supply CWP stably, the method of managing the coal concentration and viscosity in CWP is the most effective. For this reason, the present inventors have invented an invention in which a device 101 for measuring the viscosity of CWP by branching CWP discharged from the kneader outlet 13 shown in FIG. Japanese Patent Laid-Open No. 9-145487GazetteEtc.).
[0011]
  The CWP viscosity measuring device 101 is provided on the outlet side surface portion of the kneader 13, detects the CWP viscosity, and supplies the amount of water from the water tank 7 supplied to the kneader 13 by the viscosity control device 102 or pulverized coal slurry from the pulverized coal slurry tank 6. The amount is increased or decreased. FIG. 21 is a structural cross-sectional view of the CWP viscosity measuring device 101 provided on the outlet side surface of the kneader 13 shown in FIG. The CWP viscosity measuring device 101 includes a guide plate 105 for introducing CWP, a viscosity measuring container 106, a pin type rotor 107 for detecting viscosity, and a torque meter 110.. StickyIn the temperature measuring container 106, a pin type rotor 107 for measuring the viscosity of CWP is installed at the center. The pin type rotor 107 is connected to the torque meter 110.
[0012]
  At the bottom of the CWP viscosity measuring vessel 106, a CWP transfer gate valve 111 is provided. The opening / closing operation of the CWP discharge gate valve 111 is controlled by a cylinder 112 (compressed air type or hydraulic type). CWP discharged from the outlet of the kneader 13 is supplied from the guide plate (θ <40 degrees) 105 into the viscosity measuring container 106 and held in the viscosity measuring container 106 for a certain period of time. Thereafter, the gate valve 111 provided at the bottom of the viscosity measuring container 106 is opened to discharge the CWP, and the gate valve 111 is closed again to measure the viscosity of the CWP.YongGuide into vessel 106. This is repeated and the viscosity of CWP is continuously measured.
[0013]
  Further, the CWP obtained by the above wet method is pumped to the furnace by the piston pump 15 (see FIG. 20).efficiencyIn order to maintain a high level, it is necessary to reduce the amount of water in the CWP as much as possible. And the chemical | medical agent which disperse | distributes coal particles is not added for CWP manufacturing cost reduction. For this reason, CWP has a high viscosity and extremely poor fluidity compared to high-concentration coal / water slurry developed as an alternative fuel to heavy oil.
[0014]
  If the water content of CWP is small, CWP is not fluid and cannot be pumped by piston pump 15. For pumping by the pump 15, the particle size distribution of CWP is, for example, that coal having a weight average diameter in the range of 1.0 to 2.0 mm and coal having a weight average diameter in the range of 0.03 to 0.07 mm. A predetermined particle size distribution is a necessary condition, such as mixing 10-40% of the total coal weight with pulverized coal slurry previously mixed with water. However, if the water content is gradually increased, fluidity (viscosity) appears in the CWP, and the pumping by the piston pump 15 becomes possible. Since the fluidity of CWP is caused by the fine powder component of coal and water, the viscosity of CWP increases when the content of water in CWP is reduced by 1/10% in an area where moisture is low. There is.
[0015]
  Due to the above characteristics of CWP, the minimum necessary for CWP pumping by pump 15 in the production of fuel (CWP) in consideration of variations in moisture content of raw coal and controllability of the supply amount of each CWP component Manufactures CWP that contains several percent more water than moisture.
[0016]
  Conventionally, as shown in FIG. 20, in the CWP supply method, coal particles having a maximum diameter of about 6 mm, water, and limestone as a furnace desulfurization agent are mixed in a kneader 13 to obtain a CWP having a water content of about 25%. After temporarily storing in the tank 14, the pressure is increased by a plurality of piston pumps 15b, 15c in the example of FIG.Transport piping 19b,19c and CWP supply nozzles (hereinafter sometimes referred to as nozzles or CWP nozzles) 21b and 21c are pumped to a furnace 34 accommodated in a pressurized vessel 33, sprayed and dispersed in a fluidized bed 35 in the furnace 34, and burned To do. The heat transfer tube 36 in the furnace 34 is heated to generate steam from the water in the tube.
[0017]
  When the supply of CWP to the furnace 34 is stopped, the flow path is switched to the conduits 38b and 38c by the switching valves 37b and 37c, and the CWP is returned to the tank 14.
[0018]
  In FIG. 22, the pressurized container 33, the furnace 34, the heat transfer tube 36, and the CWP supply nozzles 21b and 21c of the fluidized bed boiler are shown in a plan view. FIG. 23 shows an arrangement relationship of the furnace 34, the heat transfer tube 36, and the CWP supply nozzle 21. In FIG. 23, the furnace 34 is filled with a fluid medium (sometimes referred to as BM), fluidized by combustion air supplied from below the furnace 34 through the air dispersion plate 41, and a fluidized bed 35 is formed. Yes. Heat transfer pipes 36 are arranged in the fluidized bed 35 to generate steam and supply it to a steam turbine (not shown). Furnace 34A dust removing device (not shown) for removing scattered ash is installed at the outlet of the gas, and after dedusting, the combustion gas is supplied to a gas turbine (not shown).
[0019]
  FIG. 24 shows the appearance of the CWP supply nozzle 21. The nozzle 21 is inserted into an outer cylinder 42 connected to the furnace wall 34 a and the pressure vessel wall 33 a and is fixed by a flange 43. An expansion 44 that absorbs the thermal expansion of the outer cylinder 42 is provided.
[0020]
  The total length of the CWP supply nozzle 21 is 4.5 to 6 m, and the inner diameter of the CWP supply pipe 46 is about 50 mm, which is long and thin. The outer diameter of the multiple pipe including the passage of the cooling water and the dispersed air is about 220 mm, and since it has a complicated multiple pipe structure as a whole and penetrates the pressure vessel 33 and the furnace 34, the weight is also heavy. There are many joints, and once installed, it cannot be easily removed.
[0021]
  Here, at the time of emergency stop of the furnace 34, it is required to stop and hold the supply of paste-like CWP in the CWP supply nozzle 21. The reason is as follows. That is, at the time of an emergency stop, the supply air necessary for the flow of CWP is instantaneously shut off, so that the fluidization of the furnace 34 is stopped. In this case, the supply of CWP that has been continued to be supplied from the CWP supply nozzle 21 until then needs to be stopped immediately. This is because when CWP is continuously supplied into the furnace 34 in which the fluidized bed 35 is not fluidized, incomplete combustion occurs in the bed, and a large mass called agglomerate is formed. This is because serious problems such as damage to the heat pipe 36 and a decrease in the flow performance of the fluidized bed 35 may be caused.
[0022]
  Therefore, if the CWP supply is also stopped at the time of an emergency stop, the fuel stays in the CWP supply nozzle 21. Since this pasty fuel is produced together with water, the higher the temperature is close to the boiling point of water, the more severe the separation of coal and water becomes, and it becomes unstable and easily solidifies. According to experiments, it is said that the temperature at which the pipe can be stably transported is 50 ° C. or less.
[0023]
  Therefore, even during normal operation, the CWP supply pipe 46 is covered with a cooling water pipe (not shown), and the CWP temperature is maintained below the stable supply temperature by the effect of the cooling water until immediately before being supplied into the furnace fluidized bed. It has become. Here, cooling water is allowed to flow in the cooling water pipe even when the boiler is stopped urgently. However, since CWP is stopped in the CWP supply nozzle 21 unlike the case of normal operation, CWP supply is performed. Radiant heat corresponding to the furnace inner layer temperature (about 800 ° C. to 900 ° C.) flows from the furnace 34 at the tip of the nozzle 21 into the pipe.
[0024]
  For this reason, even if the CWP staying in the CWP supply nozzle 21 is at a predetermined temperature or less as a whole, the CWP located at the tip of the CWP supply nozzle 21 rises in temperature by receiving the radiant heat of the furnace 34 directly. , Solidify. Even if it is a part of CWP, once it is solidified in the pipe, it becomes difficult to supply CWP to the furnace in the case of restart.
[0025]
[Problems to be solved by the invention]
  In the prior art shown in FIG. 20, a viscosity measuring device 101 is provided to measure the viscosity of CWP discharged from the kneader 13. The problem with the viscosity measuring apparatus 101 is that CWP adheres to the guide plate 105 and the inner wall of the viscosity measuring container 106 as shown in FIG.That is. SaidThe amount of CWP deposited increases with time and becomes solidified by drying, making it impossible to measure the viscosity. The phenomenon that CWP adheres to the viscosity measuring device 101 is due to the following reasons.
[0026]
(1) The CWP discharged from the kneader 13 slides on the guide plate 105 and is a viscosity measuring container.106Led in. When the kneader is stopped, the amount of CWP (A) adhering to the guide plate 105 greatly depends on the inclination angle θ of the guide plate 105, and the CWP adhesion amount decreases as the inclination angle θ increases. . The CWP (A) adhering to the guide plate 105 increases as the kneading machine 13 is repeatedly started and stopped, and is dried and solidified. If a large lump of CWP (A) adheres to the guide plate 105, the slip of the CWP on the guide plate 105 becomes worse and the CWP is not guided into the viscosity measuring container 106.
[0027]
(2) When filling and discharging of the CWP into the square (cuboid) viscosity measuring container 106 having four corners of 90 degrees are repeated for a long time, the CWP tends to adhere to the four corners of the viscosity measuring container 106. The growth of CWP (B) adhering to the inner wall of the viscosity measuring container 106 occurs from the four corners of the viscosity measuring container 106. Viscosity measuring container106Since the CWP adhering to the inner wall of the CWP fluctuates with the change in the CWP viscosity, the CWP to be filled is dried and solidified by coming into contact with the air. The adhering matter (b) does not readily peel off, and if the adhering amount increases in a long continuous operation, the CWP in the viscosity measuring container 106 is not discharged and the viscosity cannot be measured.
[0028]
  Therefore, the present inventionSectionThe title is to provide a viscosity measuring device capable of measuring CWP viscosity for a long time in the manufacturing process of CWP, and to eliminate problems with CWP adhesion by cleaning each part with a cleaning device.
[0029]
[Means for Solving the Problems]
  UpLessonTitleIs solved by the following solution.
The invention according to claim 1 is a kneader for kneading a mixture containing solid fuel and water (hereinafter often described as a representative example in CWP), and whether the kneader is in operation or is out of operation. A kneader operation detecting means for detecting any of the above, and a part of the pasty fuel exiting from the kneader bypassing a flow path through which the pasty fuel obtained by kneading the mixture containing solid fuel and water in the kneader A viscosity measuring device that continuously measures the viscosity of the paste-like fuel provided in the bypass flow path through which the gas flows, and has an outlet that can be opened and closed, a water injection means for cleaning the viscosity measuring device, and the kneader operation detecting means A controller for operating the water injection means when it is detected that the kneader is stopped, and for periodically operating the water injection means at predetermined intervals when it is detected that the kneader is in operation. Made paste fuel There is an apparatus.
According to a second aspect of the present invention, there is provided a kneader for kneading a mixture containing solid fuel and water and a flow path through which a paste-like fuel obtained by kneading the mixture containing the solid fuel and water flows. Paste fuel after kneading is provided with a viscosity measuring device for measuring the viscosity of the pasty fuel in a bypass channel through which part of the pasty fuel exiting from the kneading machine flows, and washing the viscosity measuring device A paste-like fuel manufacturing method in which a paste-like fuel is manufactured while continuously measuring the viscosity with the viscosity measuring device, and the water injection cleaning device is operated while the kneader is stopped. And a paste-like fuel manufacturing method in which the water injection cleaning device of the viscosity measuring device is periodically operated during operation of the kneader.
[0030]
  For example, in the apparatus for producing a coal / water paste provided with a device for measuring the viscosity of a mixed paste (CWP) of coal, limestone, and water, the viscosity measuring device is for introducing CWP attached to the CWP viscosity measuring device. A water injection means for cleaning the guide plate, the viscosity measuring container, and the viscosity detection rotor is provided, and the water injection means and means for performing a water injection operation corresponding to the output signal of the kneader are provided.
[0031]
  The water injection operation of the water injection cleaning device is performed for the guide plate, the viscosity measurement container and the rotor every time the kneading machine is stopped, and the viscosity measurement container and the rotor are periodically cleaned during the operation of the kneading machine. And the said water injection operation is provided with the water injection means performed when the gate valve for CWP discharge | emission provided in the said viscosity measurement container bottom part is open.
[0032]
  In the coal / water paste manufacturing apparatus according to the present invention, the CWP from the kneader slides on the guide plate and is guided into the viscosity measuring container, and the viscosity is measured by a rotor that detects the stirring torque provided in the center portion thereof. To do. When the kneading machine is stopped, CWP is thinly deposited on the guide plate and the inner wall of the viscosity measuring container, and is dried and solidified as time passes. When the CWP adhering to the guide plate is solidified, the slip of the CWP supplied from the kneader deteriorates and is not guided into the viscosity measuring container.
[0033]
  CWP adherence in the viscosity measuring container is more likely to adhere when the previously deposited CWP is dried and solidified. The amount of CWP adhered increases with time, and CWP cannot be discharged, making it impossible to measure viscosity. In order to prevent CWP from drying and solidifying, the viscosity measurement container and the rotor may be washed on the guide plate. For this purpose, a water injection nozzle is installed, and water is supplied to the water injection nozzle after an arbitrary time (for example, 5 minutes) after the kneading machine is stopped, and the cleaning portion is cleaned. In particular, it is important that the cleaning with water injection is performed before the CWP adhered on the guide plate is dried and solidified.
[0034]
  The CWP adheres to the inner wall of the viscosity measurement container even during the viscosity measurement operation. This is because, even during CWP viscosity measurement, when CWP in the viscosity measurement container is intermittently discharged, the flow of CWP stops at the opposing wall of the viscosity measurement container side wall on the guide plate side. In that case, it becomes easy to adhere to the location where CWP does not flow in the viscosity measuring container.
[0035]
  Therefore, cleaning of the inner wall of the viscosity measuring container is performed when CWP is discharged from the bottom of the viscosity measuring container intermittently at arbitrary time intervals during operation of the kneader. Note that any cleaning operation is performed when the gate valve at the bottom of the viscosity measurement container is open. This is because the wash water and the removed CWP are easily discharged to the discharge chute.
[0036]
  The pasty fuel used in the present invention is a coal having a weight average diameter of 0.03 to 0.07 mm mixed with water in advance in coal having a weight average diameter of 1.0 to 2.0 mm. The coal / water paste is obtained by pumping a coal / water paste made of a mixture containing coal and water contained in 10-40% of the total coal weight as a pulverized coal slurry in a coal / water paste flow path by a pumping means. Pressure value or pumping in coal / water paste flow pathabilityCombustion provided in the furnace by adding at least one of the pulverized coal slurry and water to the coal / water paste based on the value to adjust the viscosity or adjusting the pumping capacity to produce the coal / water paste Supplied to the supply nozzle.
[0037]
  For example, pressure value or pumping in coal / water paste flow pathabilityIf the pressure value or the pumping capacity value increases while monitoring the value, water and / or pulverized coal slurry is injected into the coal / water paste in the coal / water paste flow path.
[0038]
  Fuel supply to the pressurized fluidized bed furnace can be achieved by pumping with a piston pump using the viscosity (fluidity) of CWP. Viscosity of CWP is determined by the amount of water in CWP (and the particle size and amount of pulverized coal). . When a certain amount of moisture can be maintained, the pulverized coal becomes a slurry and fluidity appears in the CWP.
[0039]
  Furthermore, to describe in a specific example, pulverized coal containing pulverized coal having a weight average diameter of 0.03 to 0.07 mm previously mixed with water in coal having a weight average diameter of 1.0 to 2.0 mm. A charcoal slurry tank (6), a water tank (7), a kneader (13) for kneading a mixture containing at least coal containing pulverized coal slurry and water, and the pulverized coal slurry tank in the kneader (13) A first slurry injection pump (8) for injecting the pulverized coal slurry from (6), and a first water injection pump for injecting water from the water tank (7) into the kneader (13) ( 11), and coal / water paste in which 10-40% of the coal weight obtained by the kneading machine (13) is pulverized coal flows to the coal / water paste supply nozzle (21) of the furnace (34) Paste channel (19) and coal / water paste channel (19) Of the coal / water paste of FIG. 1 to the coal / water paste supply nozzle (21), a pumping means (15) provided with a hydraulic device (17), and a coal / water paste immediately before the pumping means (15). The second slurry injection pump (9) for injecting the pulverized coal slurry from the pulverized coal slurry tank (6) into the water paste channel (19), and the coal / water paste flow immediately before the pumping means (15) A second water injection pump (12) for injecting water from the water tank (7) into the passage (19), an oil pressure gauge (18) provided in the pressure feeding means (15), and the pressure feeding means ( 15) Pressure in the channel provided in the coal / water paste channel (19) on the downstream side Based on the detected value of the force gauge (20) and the hydraulic pressure gauge (18) or the pressure gauge (20), the coal / water paste passes through the coal / water paste flow path (19) on the downstream side of the pressure feeding means (15). A control device (24) for controlling the slurry or water injection amount of at least one of the second slurry injection pump (9) and the second water injection pump (12) so as not to be blocked. Use coal / water paste production and supply equipment.
  in this way,Moisture amount (fluidity) required for CWP pumpingOf coal / water paste channel (19)The pressure in the tube, orPressure feeding means (15)It is evaluated by monitoring the hydraulic pressure ofCoal / water paste channel (19)The pressure in the pipe, orPressure feeding means (15)The hydraulic pressure ofPressure feeding means (15)Inject water or pulverized coal slurry into the suction port to improve CWP fluidityUpGet awayOf coal / water paste channel (19)Avoid blockage in the tube.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
  Figure 1FIG. 2 is a system diagram of the cleaning device of the CWP viscosity measuring device and the control device provided in the CWP manufacturing device according to the embodiment of the present invention. FIG. 2 is a program of the cleaning flow of the cleaning device of the CWP viscosity measuring device of FIG. is there. FIG. 3 is a system diagram of a CWP production / supply apparatus for supplying CWP to the pressurized fluidized bed according to the embodiment of the present invention.
[0041]
  A viscometer 101 and its control device 102, a water injection nozzle 51 (51a, 51b), and its control device 53 are provided in the middle portion of the flow path 23 that guides CWP discharged from the kneader 13 shown in FIG. 3 to the CWP tank 14. . Viscometer 101 isInclined guide plate 105 for introducing CWP, viscosityMeterMeasuring container 106, pin type rotor 107, torTotal110 and a CWP discharge gate valve 111.
[0042]
  In order to clean the viscometer 101, water injection nozzles 51 a and 51 b are provided on the guide plate 105 and the viscosity measuring container 106. The water injection nozzle 51a is for cleaning the guide plate 105, and the water injection nozzle 51b is for the viscosity measuring container 106 and the pin type rotor 1.07The shuffToThe cleaning is performed. Although not shown here, it is desirable that the injection holes of the water injection nozzles 51a and 51b have a slit shape and the injection pattern has a fan shape. Washing with water injection is performed by the kneader 13 (Fig.3) Operation control device 56 and gate valve 111 opening / closing control device 113Is performed by opening / closing control of opening / closing valves 53a, 53b provided in the water supply pipes 52a, 52b to the water injection nozzles 51a, 51b.
[0043]
  FIG. 2 shows a cleaning program of the viscometer 101, and the guide plate 105 is cleaned when the gate valve 111 is opened after an arbitrary time after the operation of the kneader 13 is stopped. The viscosity measuring container 106 is cleaned when the kneading machine 13 is stopped and when the gate valve 111 is opened at an arbitrary time interval during operation of the kneading machine 13.
[0044]
  For measuring the CWP viscosity, the CWP discharged from the kneader 13 is branched by the guide plate 105 and guided into the viscosity measuring container 106, and the pin rotor 107This is done by measuring the torque value and converting to a viscosity. When the CWP viscosity measurement is completed, the gate valve 111 at the bottom of the viscosity measurement container 106 is opened to discharge the CWP. This operation is repeated to measure the viscosity of CWP. When the viscosity measurement is performed for a long time, CWP adheres to the guide plate 105 and the inner wall of the viscosity measurement container 106. In particular, the CWP adheres to the surface of the CWP attached to the pin-type rotor 107 and the inner wall of the viscosity measuring vessel 106 when the CWP is discharged from the viscosity measuring vessel 106 when the kneader 13 is stopped or during operation. It is caused by doing.
[0045]
  In this way, in order to prevent CWP from adhering to the members constituting the viscometer 101 and further drying and solidifying after adhering, the water injection nozzles 51a and 51b are provided on the guide plate 105 and the viscosity measuring container 106. The guide plate 105 is cleaned when the gate valve 111 is open any time after the operation of the kneader 13 is stopped. Cleaning of the viscosity measuring container 106 is performed when the gate valve 111 is opened at any time interval when the kneader 13 is stopped and during operation.
[0046]
  By performing the cleaning operation according to the above procedure, the CWP does not adhere to the inner walls of the guide plate 105, the pin type rotor 107, and the viscosity measuring container 106. The washed water is mixed into the CWP, and the amount of water increases slightly. When the amount of water increases, the properties of CWP may be deteriorated. In order to improve the cleaning effect, the cleaning water spray pressure is increased (for example, 5 kg / cm ² )It is desirable to perform an operation that shortens the injection time (for example, 2 seconds) and reduces the amount of water mixed in the CWP as much as possible.
[0047]
  As described above, in order to accurately measure the CWP viscosity after CWP production online, by installing a cleaning device that removes CWP adhering to the viscosity measuring device 101, stable CWP can be measured over a long period of time. The viscosity adjustment can also be controlled with high accuracy and efficiency.
[0048]
  Moreover, considering the power generation efficiency of the power plant using the pressurized fluidized bed boiler, it is necessary to reduce the water content of CWP even slightly,in frontIn the conventional technology, the coarsely pulverized coal, pulverized coal slurry and water are added to the CWP produced by the kneader 13 so that the fluidity or moisture content cannot be measured instantaneously. Even at the lower limit, it is set to be equal to or higher than the CWP-containing water content that can be pumped by the piston pump 15. As a result, there has been a problem that the water content of CWP is more than necessary.
[0049]
  Therefore,In this embodiment, as will be described with reference to FIG.CWP water content is reduced as much as possible, and stable pumping is possible while preventing CWP blockage in the CWP feed pipe.did.
[0050]
  FIG. 3 shows a system of a CWP production / supply apparatus for supplying CWP to a pressurized fluidized bed. The same number is attached | subjected to the same apparatus as the structure shown to the system diagram of the CWP manufacturing / supply apparatus of FIG. That is, the raw coal bunker 1, the coal feeder 2, the coarse pulverizer 3, the relay hopper 4, the wet tube mill 5, the slurry tank 6, the water tank 7, the slurry pump 8 for the kneader, the slurry pump 9 for the injection, and the water for the tube mill. Pump 10, kneading machine injection pump 11, injection water pump 12, kneading machine 13, CWP tank 14, piston pump 15, suction port 16, piston pump hydraulic device 17, hydraulic gauge 18, CWP supply nozzle 21, injection pipe 22 Etc.
[0051]
  In the CWP manufacturing / supplying apparatus having the above-described configuration, coal is supplied from the relay hopper 4, pulverized coal slurry is supplied from the slurry tank 6, and water is supplied from the water tank 7 to the kneader 13. Manufacturing. The produced CWP is temporarily stored in the CWP tank 14, and is pumped to the CWP transport pipe 19 by the piston pump 15, and is passed through the CWP supply nozzle 21.AddIt supplies to the pressure fluidized bed furnace 34 (refer FIG. 4).
[0052]
  The piston pump 15 that supplies CWP to the furnace 34 is driven by the hydraulic pressure of the piston pump hydraulic device 17, and the CWP is sent from the CWP tank 14 through the suction port 16 to the piston pump 15 and is pressure-fed to the CWP transport pipe 19. . Water can be injected into the suction port 16 of the piston pump 15 by the water injection water pump 12 and the injection pipe 22, and pulverized coal slurry can also be injected from the injection slurry pump 9 and the injection pipe 22. The piston pump hydraulic device 17 includes a hydraulic pressure gauge 18 that detects the hydraulic pressure of the piston pump 15. The CWP transport pipe 19 has a pressure gauge 20 and detects the internal pressure of the CWP transport pipe 19 during CWP pumping.
[0053]
  here,According to the degree of pressure due to the blockage of CWP inside the CWP transport pipe 19 measured by the pressure gauge 20 of the CWP transport pipe 19,Slurry pump 9 for injection from the pulverized coal slurry tank 6as well asWater pump 12 for water injection in the water tank 7ByRespectivelyOf the injection pipes 22 and 22Control device for controlling the flow rate24Is provided.
[0054]
  Moisture content of raw coal, moisture content of pulverized coal slurry produced by wet tube mill 5 and water pump 11 for kneaderwaterThe amount of water to be supplied is set so that the total amount becomes the water content of CWP. The water content of CWP produced by the kneading machine 13 is set to a minimum water content necessary for pumping with the piston pump 15. When the water content of the CWP does not change, the resistance in the CWP transport pipe 19 is also constant, and the indicated value of the pressure gauge 20 and the indicated value of the hydraulic gauge 18 are also constant.
[0055]
  When the moisture content of the raw coal decreases or the supply amount to the kneading machine 13 fluctuates and the moisture content of the produced CWP decreases, the fluidity of the slurry that freely moves in the CWP deteriorates. As a result, the piston pump 15 The fluidity of CWP in the CWP transport pipe 19 becomes worse, and the indicated value of the pressure gauge 20 or the hydraulic gauge 18 increases. The water injection pump 12 is activated before the pressure of the CWP becomes blocked in the pipe 19 and the like, and water is injected into the suction port 16 of the piston pump 15.When,Since the water content increases, the CWP sucked into the piston pump 15 improves the fluidity of the fine powder slurry, and the resistance in the pipe 19 is reduced.
[0056]
  As described above, the pressure in the CWP transport pipe 19 is monitored by the pressure gauge 20, and the hydraulic pressure of the piston pump 15 is monitored by the hydraulic gauge 18.WatchThus, the flow state in the CWP transport pipe 19 is monitored, and the blockage in the CWP transport pipe 19 due to CWP is detected in advance based on the increase in the indicated value of the pressure gauge 20 or the hydraulic gauge 18. When it is detected in advance, water is injected from the water tank 7 into the suction port 16 of the piston pump 15 to improve the fluidization of the CWP and avoid clogging. Further, even if pulverized coal slurry in the slurry tank 6 is injected instead of water to be injected into the suction port 16, fluidization of CWP can be improved, and blockage of the pipe 19 and the like can be avoided.
[0057]
  ThusCWP supplied to the pressurized fluidized bedCWP transportPiping19Occluded inLetIt is possible to reduce moisture without causing an effect of improving the power generation efficiency of a power plant using a pressurized fluidized bed boiler.
[0058]
  Pressurized fluidized bed furnace34The CWP supplied to the coal has a large coal particle size, the coal and water are easily separated, and the fluidity of the CWP is not very good. For this reason, conventionally, the supply of CWP does not branch off in the middle as shown in FIG. 22, but one piston pump (CWP pump) is supplied to one CWP supply nozzle 21.The15) and one CWP transport pipe 19. For example, for the CWP supply nozzle 21b, the CWP is connected to the piston pump 15b and the CWP.Transport distributiontube19sent by b.
[0059]
  On the other hand, as the piston pumps 15b and 15c, a two-cylinder piston pump is conventionally used, and there is no CWP supply stop period in the CWP suction process that occurs when a single-cylinder piston pump is used as shown in FIG. CWP can be discharged. As a result, the temperature rise at the tip of the CWP supply nozzle 21 during the CWP supply stop period of the suction process, and the blocking of the CWP supply nozzle 21 due to drying and solidification of the CWP due to this, are suppressed.
[0060]
  When the pressurized fluidized bed boiler becomes a commercial scale and the fluidized bed cross-sectional area becomes large, if the number of CWP supply nozzles 21, that is, the number of coal supply points is small, the combustion distribution in the fluidized bed 35 becomes nonuniform and local in the furnace cross section. A typical oxygen-deficient region or conversely an oxygen-excess region occurs. As a result, an unburned portion increases in the oxygen-deficient region, the unburned char is scattered in the upper space of the fluidized bed 35, and a combustion gas containing high-concentration oxygen is fluidized in the fluidized bed. The unburnt char may flow into the upper space 35 and burn the unburned char to cause a so-called upper layer combustion phenomenon.
[0061]
  As a result, the gas temperature may rise, exceeding the allowable temperature of the component on the wake side of the upper part of the bed, or exceeding the measured value of the gas turbine output. Therefore, coal is used as the furnace 34In order to make the distribution of combustion uniform in each region, it is essential to increase the number of CWP supply points, that is, the number of CWP supply nozzles 21.
[0062]
  However, since the fluidity of CWP is not good as described above, it is necessary to provide one piston pump 15 and one CWP transport pipe 19 for one of the CWP supply nozzles 21 and increase the number of nozzles. There is a problem that the equipment cost becomes higher as it goes on.
[0063]
  CWP as a countermeasureTransport distributiontube19It is conceivable that CWP is supplied to a plurality of nozzles 21 from a single piston pump 15, but the flow rate of the flow rate is adjusted by an abrupt throttling mechanism because the fluidity of CWP is not good as described above. It is difficult to evenly distribute the CWP flow rate to each nozzle 21. Also, the aboveArrangementtube19There is a possibility that the nozzle 21 is blocked due to non-uniform flow distribution due to the branching.
[0064]
  Therefore, Less piston pump15CWP is supplied to a plurality of CWP supply nozzles 21 while maintaining the fluidity of CWP usingAn apparatus capable of performing the following will be described.
[0065]
  This methodPressure vessel33Inside fuel supply nozzle21Fluidized bed furnace34In a pressurized fluidized bed boilerCWPA two-cylinder or multi-cylinder piston type pump15In a method for supplying fuel to a pressurized fluidized bed boiler supplied with a two-cylinder or multi-cylinder piston pump15Multiple pistons provided in15One fuel supply nozzle corresponding to each cylinder by each cylinder21For supplying fuel to a pressurized fluidized bed boiler with CWP supplied theretoIt is.
[0066]
  For example, one 2-cylinder slurry pump152 CWP supply nozzles21To supply CWP to two or more pistons15One multi-cylinder slurry pump with15Therefore, multiple CWP supply nozzles21Supply CWP.
[0067]
  The specific method is as follows.
(1) Plural piston pumps provided in a conventionally used two-cylinder or multi-cylinder slurry pump15Each corresponding one CWP supply nozzle21CWP slurry is supplied to
(2) CWP supply nozzle21CWP at the tip ofTransport distributiontube19Water is constantly poured into the inner CWP to suppress drying and solidification of the CWP during the CWP supply stop time in the suction process.
[0068]
  UpNotationOne pump by law15One CWP supply nozzle by one cylinder of a plurality of pistons21By supplying CWP to the nozzle, the number of nozzles can be increased by a factor of two or more compared to the conventional method of supplying a single CWP supply nozzle from a single or multi-cylinder slurry pump. it can.
[0069]
  However, one cylinder pistonPump 15CWP supply nozzle at the supply stop time of CWP suction process by supplying CWP with21In some cases, the CWP may be dried and solidified.
[0070]
  For this problem, the above CWPTransport distributiontube19According to the method of injecting water into the CWP, the CWP can be coped with by maintaining the water concentration higher than the pump dischargeable water at a certain amount of water injection. This is a furnace34CWP supply nozzle from fluid medium BM inside21CWP supply nozzle in the stopped state21This is because the temperature rise and solidification of the CWP caused by the radiant heat to the end of the glass is suppressed by the injected water, and at the same time, the evaporated water is supplemented.
[0071]
  Figure 4CWP using piston pump 15Pressurized fluidized bed boilerTo a plurality of CWP supply nozzles 21FIG. 3 is a flowchart whenParts shown inThe same parts are denoted by the same reference numerals, and the description of the same flow is omitted.
[0072]
  As shown in FIG. 4, the CWP stored in the CWP tank 14 is a case where a plurality of, for example, two two-cylinder piston pumps 15b and 15c are provided in FIG. Each from CWPTransport distributiontube19a,19b and CWP supply nozzles 21a and 21b, respectively, from the two pistons of the pump 15c, respectively,transportArrangementTube 19c,19d and CWP supply nozzles 21c and 21d are supplied to the fluidized bed 35 in the furnace 34. Thereby, CWP can be supplied to the four nozzles 21a to 21d by the two pumps 15b and 15c. Fluidized bed 35When stopping the supply of CWP to the tank, the switching valves 37a, 37b, 37c and 37d are switched to the conduits 38a, 38b, 38c and 38d, respectively, and returned to the tank 14.
[0073]
  NextTo CAn example of the structure of the WP supply nozzle 21 will be described with reference to the drawings. Figure 5 shows CWPTransport distributiontube19To pour water into the CWP insideCThis is a WP supply nozzle 21.
[0074]
  The CWP supply nozzle 21 has a CWP supply pipe 46 and a cooling water pipe 47 having a reciprocating water channel from the center., MinutesThe air diffuser tube 48 is formed of concentric tubes in this order. The characteristic of the nozzle 21 shown in FIG.Water pipe47, the tip end 55 a of the CWP supply pipe 46 is opened so as to inject water into the CWP in the CWP supply pipe 46. The water injection conduit 55 is prevented from being vaporized by passing through the cooling water pipe 47.
[0075]
  The cooling water pipe 47 flows through the cooling water and keeps the wall temperature of the CWP supply pipe 46 at 60 ° C., preferably 50 ° C. or less, to prevent evaporation of water in the CWP. The dispersion air pipe 48 injects CWP supplied through the CWP supply pipe 46 into the fluidized bed.put outThe high pressure air is used to discharge the high pressure air from the dispersed air injection slit 48a to the CWP supply pipe 46 and collide with the CWP exiting from the CWP supply pipe 46, and the fluidized bed 35 in the fluidized bed furnace 34. Spray and supply.
[0076]
  In the above structure, the CWP is sent through the CWP supply pipe 46, and the cooling water is sent through the cooling water pipe 47, returned from the tip of the nozzle 21, and discharged. The dispersed air is ejected from the dispersed air ejection slit 48a to the CWP supply pipe 46, and the CWP is fluidized to the fluidized bed 3 by the dispersed air.5Squirted into the inside. The injected water is supplied to the CWP supply pipe 46 from the tip 55a through the injected water conduit 55.
[0077]
  As described above, when CWP is supplied from one piston 15 of the two-cylinder piston pump 15 through one CWP supply pipe 46 and CWP supply nozzle 21, respectively, the CWP is as shown in FIG. It will be supplied intermittently. That is, in the CWP suction process, the CWP temporarily stagnates in the CWP supply pipe 46, and the stagnation CWP is in the fluidized bed 3.5Moisture is evaporated and dried and solidified by the heat entering from.But,According to the CWP supply nozzle 21 shown in FIG. 5, the CWP in the CWP supply pipe 46 that is in a stopped state is injected from the water injection conduit 55 so that it does not dry and solidify.
[0078]
  Figure 6 shows the bookEmbodiment5 is a relationship between the water injection amount of the water injection type nozzle 21 shown in FIG. 5 and the pump discharge pressure. Of the CWP supply pipe 46Diameter 27mmIn the CWP supply nozzle 21, the CWPTransport distributiontube19The temperature of the pipe wall was maintained at 50 ° C., and the water temperature was injected into the CWP at the tip of the nozzle 21, so that the combustion temperature of the fluidized bed furnace 34 was 860 ° C., the furnace pressure was 0.9 MPa, and the CWP supply amount was about 600 kg / h ( The time average value is about 300 kg / h).
[0079]
  It was confirmed that the pump outlet CWP pressure does not increase when the amount of water injected is 0.10 kg / h or more, that is, the CWP can be discharged and supplied to the furnace without the nozzle tip clogging. Although a slight increase was observed in the CWP pressure at the pump outlet when the amount of injected water was 0.03 kg / h, the CWP discharge and supply to the furnace 34 were not hindered. These are the effects of the CWP temperature rise caused by the radiant heat from the fluid medium in the furnace to the remaining CWP end of the nozzle tip being suppressed by the injected water from the conduit 55 and simultaneously replenishing the evaporated water.
[0080]
  As described above, the amount of water supplied to the CWP supply nozzle 21 is 0.10 kg / h or more with respect to the time average supply amount of CWP of about 300 kg / h, and a very small amount of 0.03% or more in terms of rate. Yes, combustion rate in the furnace 34, emissionelectronicThe impact on the rate is negligible.
[0081]
  On the other hand, although CWP is intermittently supplied to the furnace 34 as fuel, the number of CWP supply nozzles 21 is doubled and the CWP supply stop period by the adjacent CWP supply nozzles 21 does not overlap. By adjusting to, there was no increase in unburned content and no combustion phenomenon on the bed. The interval between the suction and discharge processes by the piston pump 15 was 0.5 to 3 minutes although it was changed depending on the CWP supply load.
[0082]
  Furthermore, a slurry can be supplied from one pump 15 to two or more slurry supply nozzles by combining the water injection type nozzle 21 and the multi-cylinder piston pump 15 having two or more pistons.
[0083]
  ThusPressurized fluidized bedFurnace 34In the supply of CWP, the number of CWP nozzles can be increased in comparison with the same number of pumps, uniform combustion can be achieved in the cross-sectional area of the furnace, the combustion rate in the layer is improved, and the upper layer combustion phenomenon In addition, it is possible to provide a pressurized fluidized bed combustion boiler with high efficiency and low pollution.
[0084]
  On the other hand, in the comparison with the same number of CWP supply nozzles, the number of pumps can be reduced, and an economical pressurized fluidized bed combustion boiler with low equipment cost can be provided.
[0085]
  Also,in frontNozzle for supplying CWP in a pressurized fluidized bed boiler using a conventional wet supply system21In some cases, it is necessary to stop the combustion urgently due to a malfunction. The following items can be cited as the cause.
(1) Blocking of the ejection holes and air ejection holes of the CWP supply nozzle 21;
(2) leakage of cooling water from the CWP supply nozzle 21;
(3) Wear and refraction of the ejection holes of the CWP supply nozzle 21;
(4) Burnout of the tip of the CWP supply nozzle 21;
  The current situation is that these problems cannot be addressed while operating a fluidized bed boiler.
[0086]
  Therefore, a method of continuing the operation with the failed CWP supply nozzle 21 installed, that is, with a reduced operating load, or stopping the boiler plant and repairing and restarting the failed part can be considered. Therefore, it is essential to ensure the reliability of the CWP supply nozzle 21. However, when periodic inspection of the plant is performed once a year, it is actually difficult to move the CWP supply nozzle 21 without a failure for one year.
[0087]
  Therefore,nextNozzle during operation without stopping the pressurized fluidized bed boiler21Repair the faulty part or new nozzle21Replaceable nozzle21Extraction deviceWill be described.
[0088]
  7 to 9 show an example of a device suitable as a device for extracting the nozzle 21. FIG. Nozzle extraction device of FIG.Pressure vessel33And the pressure vessel33Fluid medium stored inBMFluidized bed to fluidize35And the fluidized bed35Fuel supply nozzle to supply fuel to21Fluidized bed furnace34A fuel supply nozzle extracting device for a pressurized fluidized bed combustion apparatus, wherein the fuel supply nozzle21The outer cylinder that supports42Fuel flow medium backflow prevention plate60And gas shut-off gate type or ball type valve61And gas purge introduction pipe62And the nozzle21Means to drive back and forth65And external cylinder outside the furnace from the gas shutoff valve installation42To pressure detection conduit64Is used.
[0089]
  For example, the furnace34Nozzle to supply CWP to21The outer cylinder that supports42Flow medium backflow prevention plate60, Gate type or ball type valves that shut off gas61, Gas purge introduction pipe62And nozzle21Means to drive back and forth65And gas shutoff valve61Outer cylinder in front42To pressure detection conduit64It is equipped with.
[0090]
  The fluidized bed furnace34CWP supply nozzle for supplying CWP to21For example, CWP jet hole71When is closed, there are the following operations and actions according to the operations.
[0091]
  The outer cylinder42Plate for preventing backflow of fluid medium driven up and down provided at the tip of60The plate60Compressed gas cylinder for driving79Gas shutoff valve61Plate for preventing fluid flow back to the gate plate60Fixing the valve61Equipped to drive up and down(Fig. 8)Or the fluid medium backflow prevention plate60Circular plate with hinges on76Configuration with(Fig. 9)And the nozzle21To drive the cylinder back and forth42Inside and nozzle21Fixed with screws on the outside of the cylinder or compressed gas cylinder78Cylinder79Nozzle inside21It is the structure provided with the means to inject | pour and fix.
[0092]
  Further, the gas cutoff valve61Gas purge hole on the fluidized bed side71Provided with means for using exhaust gas or nitrogen gas as the purge gas, or the nozzle21Gas shutoff valve provided on the nozzle support cylinder61Gas shut-off valve when pulled out further61Close the shutoff valve61Pressure gauge installed in front of72After confirming that the instruction is zero, it may be configured to include means for extracting the nozzle out of the system.
[0093]
  In FIG.The nozzle extraction device shown isThe CWP supply nozzle 21 for supplying CWP into the fluidized bed furnace 34 is inserted into the outer cylinder 42 connecting the furnace wall 34a and the pressure vessel wall 33a and set at a predetermined position. The outer cylinder 42 includes an expansion 44, a flow medium backflow prevention plate 60, a gas shutoff valve 61, a purge gas introduction pipe 62, a pressure detection pipe 64, a forward and backward screw 65 of the CWP supply nozzle 21, and a cooling pipe using cooling water. Composed of 66NoThe
[0094]
  The fluid medium backflow prevention plate 60 is installed on the furnace 34 side from the gas shutoff valve 61, and the vertical drive part is a dedicated compressed gas cylinder 67 of the fluid medium backflow prevention plate 60 or the fluid medium backflow as shown in FIG. The prevention plate 60 is welded or bolted to the gas shutoff valve 61NoThe
[0095]
  The gas shut-off valve 61 is a gate type or a ball type, and has a mechanism in which a vertical or rotational drive is performed by a compressed gas type cylinder 69. Purge gas introduction pipe62Is provided with a plurality of ejection holes 71 below the gas shutoff valve 61 on the furnace 34 side. Since the outer cylinder 42 is installed in an atmosphere of 350 ° C., an expansion 44 is installed in consideration of thermal expansion. The pressure detection conduit 64 is installed outside the gas cutoff valve 61, and the conduit 64 is provided with a pressure detector 72 and a valve 73 outside the pressure vessel wall 33a. The mechanism for advancing and reversing the nozzle 21 has a structure in which a screw 65 is installed inside the outer cylinder 42 and outside the nozzle 21 to rotate and extract the nozzle 21. The outer cylinder 42 is provided with a water-cooled tube 66 on the outside.Has beenThe
[0096]
  When CWP is supplied to the pressurized fluidized bed furnace 34, if the CWP supply nozzle 21 fails, the following operation is performed.
(1) First, the operation of the piston pump 15 is stopped, the valve 74 in front of the CWP supply nozzle 21 is closed, and a part of the piping is removed to extract the nozzle 21 out of the system.
(2) Purge gas near the gas shutoff valve 61 provided in the outer cylinder 42TheAfter ejecting, when the nozzle 21 is rotated and pulled out of the system, when the nozzle 21 passes the fluid medium backflow prevention plate 60, the fluid medium backflow prevention plate 60 is lowered.
[0097]
(3) When the nozzle 21 is further pulled out of the system, when the nozzle 21 passes the gas cutoff valve 61, the gas cutoff valve 61 is closed.
(4) In order to check the sealing performance of the gas shutoff valve 61, the valve 73 of the pressure detection conduit 64 in the outer cylinder 42 is opened, the pressure in the outer cylinder 42 is brought to atmospheric pressure, and then the valve 73 is closed to detect the pressure. The pressure is checked with a vessel 72.
(5) A blind flange is attached to the flange 75 of the outer cylinder 42 after the nozzle 21 is completely removed from the system.
(6) The fluid medium that has flowed back to the tip of the outer cylinder 42 by the exhaust gas or nitrogen gas in the purge gas injection hole 71 provided in the vicinity of the gas shutoff valve 61 is returned into the furnace 34.
[0098]
(7) The repaired nozzle 21 or new nozzle is rotated and inserted into the outer cylinder 42, opened in front of the gas shutoff valve 61, and the fluid medium backflow prevention plate 60 is raised and inserted to a predetermined position. Supply CWP.
(8) Purge gasTheStop.
[0099]
  Other embodiments will be described with reference to FIGS. The example shown in FIG. 8 is a mechanism in which the fluid medium backflow prevention plate 60 is lowered while the gas shutoff valve 61 is closed by fixing the fluid medium backflow prevention plate 60 shown in FIG. It has become.
[0100]
  FIG. 9 shows a cross-sectional view of a hinged fluid medium backflow prevention plate 76, which is a hinged fluid medium backflow prevention plate.TheThe rate 76 naturally falls when the nozzle 21 is pulled out to the outside of the system, and the outer cylinder 42 is closed to prevent the backflow of the fluid medium. Further, by inserting the nozzle 21 to the fluidized bed furnace 34 side, when the nozzle 21 comes into contact with the fluid medium backflow prevention plate 76, the nozzle 21 is pushed upward. FIG. 10 shows a drive unit for moving the nozzle 21 forward and backward, in which the cylinder 79 of the compressed gas cylinder 78 is hollow, and the nozzle 21 is installed in the hollow portion to provide a flange.82It is fixed with. The compressed gas is compressed nitrogen or air.
[0101]
  In this way, the nozzle 21 which has failed during the boiler operation can be extracted without repairing the load reduction and operation of the pressurized fluidized bed boiler, and repair and replacement of new nozzles can be easily performed, and long-term operation can be continued. .
[0102]
  Thus, Nozzle failed during operation without reducing load and stopping operation of pressurized fluidized bed boiler21Remove, repair and new nozzle21Can be easily exchanged for long-term operation.
[0103]
  In the CWP supply nozzle structure, the fluidized bed35Nozzle under operating conditions such as emergency stop21Even if measures are taken to prevent the fuel located at the tip from solidifying, there is an event that the fuel is solidified and the boiler cannot be restarted.
[0104]
  Therefore, NoUnavoidably CWP supply nozzle21Cleaning device that quickly crushes the solidified fuel and removes it outside the tubeWill be described.
[0105]
  the aboveCWP, Fluidized bed furnace34Nozzle to supply21ButCWPWhen clogged with21For cleaning the inside of the pipeThe nozzle cleaning device used is,As shown in FIG.nozzle21For injecting water to the solidified fuel part at the tip of the tubeWater injection pipe 85And scraping the solidified CWP80,134Jig withAnd using the jigInsert to the solidified fuel part, supply water from outside the pipe to clean the solidified fuel in the pipe,The waterFluidized bed furnace34It is discharged outside the pipe again with the solidified fuel pulverized without being discharged inside.be able to.
[0106]
  Above NozLe QingSweeper80Reach the tip of the rotating shaft in the shaftWater injection pipe 85The rotating shaft80The tip of the drill part130A rotating shaft80Spiral fins on the outer periphery134Is provided.
[0107]
  HonseiIn-pipe cleaning method using sweeperIsDo as follows.
  Fluidized bed furnace34Furnace during shutdown34And the furnace34Pressure vessel33When stored in a pressure vessel33When the pressure of the fuel drops to atmospheric pressure, the fuel supply nozzle21Pressure vessel33Disassemble the outer flange part and nozzle21Pressure vessel on the inner surface of the pipe33Make it accessible from the outside. Nozzle cleaning device with pressure vessel33Outer fuel supply nozzle21Long rotating shaft80Is inserted into the inner surface of the nozzle while rotating.
[0108]
  At this time, long nozzle21To insert the cleaning device into the cleaning device nozzle21However, positioning is easy to install the device on the nozzle flange portion. Long shaft80The tip of the drill part130Is provided for the solidified fuel part130The solidified fuel is cut and pulverized with a rotational force of. The ground solid fuel is the shaft80Spiral fin provided around134Through pressure vessel33Discharged to the outside.
[0109]
  Since it is preferable to supply moisture in order to facilitate cutting and grinding the solidified CWP, the rotating shaft80The inside is hollow and supplied to the tip. This water supply is drilled130Spiral fin with crushed solidified fuel after being fed to the tip of134Through the container33Discharged to the outside. So this feed water is nozzle21This also contributes to the smooth discharge of solidified fuel to the outside.
[0110]
  nozzle21If the length of the cleaning shaft is short and the length of the cleaning shaft of the device is insufficient,136 (FIG. 16)As necessary, the axial length of the apparatus is increased. axis80,136The weight of the shaft80,136Fins provided around134,139Through the nozzle21Therefore, even if the axial length of the apparatus is extended, the function of the cleaning apparatus is not hindered by bending or the like.
[0111]
  Even if the solidified part and non-solidified part of the fuel in the nozzle are mixed, the drill part at the tip130By properly setting the rotation torque and feed speed of the nozzle21The nozzle removes the residual fuel inside21The inside can be cleaned.
[0112]
  More specificallyImplementation of nozzle cleaning device structureForm of11 to 19Will be described.
  Cleaning shaft for cleaning the inside of the CWP nozzle 21(Axis of rotation)80 is supported by the inside of the driving device 81 and the shaft support 84. The cleaning shaft 80 has a double pipe structure, and the supply water 86 passes through the inside of the water injection pipe 85 (FIG. 15), and CWP discharged between the water injection pipe 85 and the outer cylinder 87 (FIG. 15) and Cleaning water passes. The supply water 86 is supplied from a hose 88 and a union joint 89, and the amount of water injected is adjusted by a water supply source valve 90. Further, the supply water 86 is guided to a water injection pipe 85 (FIG. 15) in the cleaning shaft 80 through a swivel joint 92 that prevents the rotation of the shaft 80 from being transmitted to the hose 88 side, and a coupler 93.
[0113]
  Further, the CWP and cleaning water discharged through the water injection pipe 85 and the outer cylinder 87 are collected by the hose 120 from the CWP receiver 94. These parts are a support frame attached to the drive device 81.95The drive device 81 is mounted on the flange portion 99 (FIG. 17) of the CWP supply nozzle 21 using the flange mounting support 97. Since the flange 99 is machined to match the hole axis of the CWP nozzle 21, the cleaning device can be easily centered automatically by attaching the drive device 81 to the flange 99. become. Since a part of the CWP and cleaning water is discharged outside the outer cylinder 87 (FIG. 15) of the cleaning shaft 80, this is used as the shaft cleaning water inlet of the hose 120.118Wash water is supplied from the shaft, the outer cylinder 87 is washed, and the shaft wash water outlet119So that the inside of the driving device 81 is not contaminated.
[0114]
  FIG. 13 is a partial detailed view of the driving device 81, and FIG. 14 is a view taken along the line AA in FIG. The rotational force of the gear motor 122 is transmitted from the motor pulley 123 to the cleaning shaft 80 via the drive roller 124. In order to properly transmit the rotational force, a presser roller 125 is installed, and is properly adjusted and attached by a jack nut 127. The outer surface of the outer cylinder 87 of the cleaning shaft 80 has a screw structure, and the cleaning shaft 80 is inserted into the tube of the nozzle 21 in conjunction with the rotation by the shaft feeding device 126 attached to the driving device 81 and is pulled out.
[0115]
  FIG. 15 is a detailed view of the cleaning shaft 80 of the tip drill part. The water injection hole 132 is provided in the drill portion 130 of the water injection pipe 85, and the supply water 86 is injected from here to facilitate the cleaning of the solidified CWP. A fin 134 is spirally wound and attached between the water injection pipe 85 and the outer cylinder 87, and plays the role of conveying the internal CWP to the outside as the shaft 80 rotates. The outer cylinder 87 is fixed to the water injection pipe 85 with a fixing pin 135.
[0116]
  FIG. 16 shows a cleaning shaft 136 that is appropriately connected as an extension when the length of the cleaning shaft 80 of FIG. 15 is insufficient, and is also composed of a water injection pipe 137 and an outer cylinder 138, with a fin 139 interposed therebetween. Is provided.Of the cleaning shaft 136Cleaning shaft 80WhatAre connected by a set screw 140. The outer cylinder 138 is fixed to the water injection pipe 137 with a fixing pin 141.
[0117]
  17 to 19 show an outline of a cleaning procedure using the cleaning device. FIG. 17 shows a state in which the cleaning device is set on the CWP nozzle flange 99. The CWP and cleaning water discharged from the CWP nozzle 21 are collected in the CWP cleaning water receiving box 142 or the cleaning water receiving box 143. FIG. 18 is a diagram illustrating a state diagram of the apparatus during cleaning. FIG. 19 is a view showing a state in which the cleaning device is removed and the CWP transport pipe 19 (FIG. 4) is attached and restored after cleaning the CWP nozzle pipe. Since the inside of the pipe is cleaned, the plant can be started up smoothly by supplying CWP.
[0118]
  Thus, fluidized bed furnace34Even when the fuel supply nozzle 21 that supplies CWP to the long, small-diameter nozzle solidifies the fuel, the fuel remaining in the nozzle including the solidified fuel is removed out of the system, and the inside of the nozzle is quickly removed. And it can be easily cleaned. Further, the CWP solidified in the furnace fluidized bed is discharged and does not hinder the operation.
[0119]
【The invention's effect】
  Main departureClearlyIn addition, by installing a cleaning device to remove CWP adhering to the viscosity measuring device, the CWP viscosity after CWP production can be accurately measured online over a long period of time, and CWP viscosity adjustment control Can be performed accurately and efficiently.
[Brief description of the drawings]
FIG. 1 is a system diagram of a cleaning device and a control device for a CWP viscosity measuring device provided in a CWP manufacturing device according to an embodiment of the present invention.
FIG. 2 is a program of a cleaning flow of the cleaning device of the CWP viscosity measuring apparatus of FIG.
FIG. 3 is a system diagram of a CWP manufacturing / supplying apparatus for supplying CWP to a pressurized fluidized bed according to an embodiment of the present invention.
FIG. 4 is a diagram showing an embodiment of a fuel supply system to a pressurized fluidized bed boiler according to the present invention.
FIG. 5 is a view showing an embodiment of a slurry (CWP) supply nozzle used in the boiler of FIG. 4;
6 is a graph showing the relationship between the amount of water injected into the CWP used in the boiler of FIG. 4 and the piston pump outlet pressure.
FIG. 7 is a cross-sectional view of the extraction structure of the CWP supply nozzle of the pressurized fluidized bed boiler according to the embodiment of the present invention.
FIG. 8 is a structural cross-sectional view of a fluid medium backflow prevention plate of a pressurized fluidized bed boiler according to an embodiment of the present invention.
FIG. 9 is a structural cross-sectional view of a fluid medium backflow prevention plate of a pressurized fluidized bed boiler according to an embodiment of the present invention.
FIG. 10 is a sectional view of a cylinder type extraction structure of a CWP supply nozzle of a pressurized fluidized bed boiler according to an embodiment of the present invention.
FIG. 11 is an overall plan view showing the boiler fuel supply nozzle cleaning device according to the embodiment of the present invention.
FIG. 12 is an overall front view showing the boiler fuel supply nozzle cleaning device according to the embodiment of the present invention.
13 is a partial detail view showing details of the drive device of the apparatus of FIG. 11. FIG.
14 is a view taken along the line AA in FIG.
15 is a partial detail view showing details of the nozzle cleaning shaft of FIG. 11. FIG.
16 is a partial detail view showing details of the nozzle cleaning shaft of FIG. 11. FIG.
17 is a schematic diagram showing an operation sequence of the nozzle cleaning device of FIG. 11. FIG.
18 is a schematic diagram showing an operation sequence of the nozzle cleaning device of FIG. 11. FIG.
FIG. 19 is a schematic diagram showing an operation sequence of the nozzle cleaning device of FIG.
FIG. 20 is a system diagram of a conventional CWP manufacturing apparatus.
FIG. 21 is a cross-sectional view of the online viscosity measuring apparatus shown in FIG.
FIG. 22 is a view showing a fuel supply system of a conventional pressurized fluidized bed boiler.
FIG. 23 is a view showing a longitudinal section of a general pressurized fluidized bed boiler.
FIG. 24 is a structural diagram of a CWP supply nozzle of a conventional pressurized fluidized bed boiler.
FIG. 25 is a cleaning device for a CWP viscosity measuring device provided in a conventional CWP manufacturing device.
FIG. 26 is a diagram showing a general CWP supply amount characteristic of a single cylinder type piston pump.
[Explanation of symbols]
    1 Raw coal bunker 2 Coal feeder
    3 Coarse crusher 4 Relay hopper
    5 Wet tube mill 6 Slurry tank
    7 Water tank 8 Slurry pump for kneader
    9 Slurry pump for injection 10 Water pump for tube mill
    11 Water pump for kneading machine 12 Water pump for injection
    13 Kneader 14 CWP tank
    15 Piston pump 16 Suction port
    17 Hydraulic system for piston pump 18 Hydraulic gauge
    19 CWP transportation piping 20 Pressure gauge
    21 CWP supply nozzle 22 Injection pipe
    23 Flow path for CWP discharge24  Control device
    33 Pressurized vessel 34 Furnace
    35 Fluidized bed 36 Heat transfer tube
    37 Switching valve 38 Conduit
    41 Dispersion plate 42, 87, 138 Outer cylinder
    43 Flange 44 Expansion
    46 CWP supply pipe 47 Cooling water pipe
    48 Dispersed air pipe 48a Dispersed air ejection slit
    51a, 51b Water injection nozzle 52 Water supply pipe
    53 Control device 55 Water injection pipe
    56 Kneader Operation Control Device 60 Fluid Medium Backflow Prevention Plate
    61 Gas shut-off valve 62 Purge gasIntroduction pipe
    64 Pressure detection conduit 65 Screw
    67 Compressed gas cylinder 69 Compressed gas cylinder
    71 Purge gas ejection hole 72 Pressure detector
    73, 74 Valve 75 Flange
    76 Hinge fluid medium backflow prevention plate
    78 Compressed gas cylinder 79, 112 cylinder
    80, 136 Cleaning shaft 81 Drive device
    82 Flange                    84 axis support
    85 Water supply pipe 86 Supply water
    88 Hose 89 Union Fitting
    90 Water injection valve 91 Stirrer
    92 swivel joint 93 coupler
    94 CWP95  Support frame
    97 Flange mounting support 99 CWP nozzle flange
    100 CWP pump 101 Viscometer
    102 stickinessDegree systemControl device 105 Information board
    106 Viscosity measuring container 107 Pin type rotor
    110 TorqueTotal                  111 Gate valve
    112 cylinders                  113 Open / close control device
    118 Shaft cleaning water inlet              119 Shaft cleaning water outlet
    120 hose 122 gear motor
    123 Motor pulley 124 Drive roller
    125 Roller 126 Axis feeder
    127 Jack nut 130 Drill part
    132 Water ejection holes 134, 139 Fins
    135 Fixing pin 137 Injection pipe
    140 Set screw 141 Fixing pin
    142 CWP cleaning water receiving box 143 cleaning water receiving box

Claims (2)

A kneader for kneading a mixture containing solid fuel and water;
A kneader operation detecting means for detecting whether the kneader is in operation or is stopped; and
Kneader with solid fuel and the mixture kneaded to resulting pasty fuel pasty which bypasses the flow path provided in the bypass flow path portion flows pasty fuel exiting the kneader flowing containing water A viscosity measuring device that continuously measures the viscosity of the fuel and has an openable / closable outlet;
Water injection means for cleaning the viscosity measuring device;
Upon detecting that the kneading machine operation detecting means is stopped kneader operation, periodically the water injection means at a predetermined interval detects that the water injection means is operated, and also in operation of the mixer An apparatus for producing a paste-like fuel, comprising: a control device that is operated. Pasty fuel leaving the mixture containing the solid fuel, water and kneading machine for kneading, the kneading machine in the solid fuel and a mixture containing water to bypass the flow path through which pasty fuel obtained by mixing kneader some viscosity measuring device for measuring the viscosity of the paste fuel to bypass flow path that flows provided, the water injection cleaning apparatus for cleaning a the viscosity measurement device provided in the bypass passage of the pasty fuel after kneading a method for manufacturing a paste-like fuel to produce a pasty fuel while continuously measuring the viscosity the viscosity measuring device,
A method for producing a paste-like fuel, wherein the water injection cleaning device is operated while the kneader is stopped, and the water injection cleaning device of the viscosity measuring device is periodically operated during the operation of the kneading machine.

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