JP5577145B2 - Gasification power generation system - Google Patents

Description

  The present invention relates to a gasification power generation system including a gasification furnace that heats a solid carbonaceous material to generate a combustible gas, and an engine power generation device that generates electric power by supplying the combustible gas. The present invention relates to a blower capable of preventing leakage of flammable gas without causing drive troubles caused by impurities such as soot, tar, and dust in the flammable gas flowing in the electric power generation system.

  In recent years, the effective use of so-called biomass, that is, resources derived from living organisms that are currently living and inhabiting, such as thinned wood and milled wood generated from forest and wood processing, has been studied. One of the technologies for utilizing such organic matter including biomass (hereinafter referred to as “solid carbonaceous material”) is a combustible gas such as biogas (carbon monoxide, hydrogen, methane, etc.) using a gasifier. There is a gasification power generation system that generates electric power with an engine power generation device using the combustible gas.

  In the gasification power generation system, in order to generate the combustible gas, it is necessary to send a gas material such as air, oxygen, and water vapor into the gasification furnace in addition to the solid carbonaceous material. A technique for installing a blower at the entrance to the chemical furnace is known (for example, see Patent Document 1). In this technique, a positive displacement blower such as a Roots-type blower is used as the blower so that the flow rate of the gas material supplied to the gasification furnace can be accurately controlled.

JP 2008-63363 A

  However, in the above technology, since the positive displacement blower is disposed at the gasification furnace inlet, it functions as a so-called forced draft blower that introduces a gaseous material into the gasification furnace after increasing the pressure. In the gasification furnace and in the gas flow path from the gasification furnace to the engine power generator, the positive pressure is higher than the atmospheric pressure. For this reason, if each component in the gasification power generation system deteriorates due to a thermal cycle or high-temperature corrosion due to long-term operation, there is a problem that combustible gas leaks from the gaps between the connecting portions of the component. It was.

  Therefore, the positive displacement blower is arranged as a so-called induction draft blower in the gas flow path immediately before the engine power generator, and in the gasification furnace and in the gas flow path from the gasification furnace to the blower, By setting the negative pressure lower than the atmospheric pressure, a countermeasure for preventing leakage of combustible gas can be considered. However, in this case, if the impurities in the combustible gas adhere to and adhere to the component device in the middle of the gas flow path, particularly the drive unit of the blower, the blower malfunctions, and the introduced gas material is reduced and combustible. There was a problem that the generation amount of the property gas also decreased, and the power generation efficiency of the gasification power generation system was greatly reduced.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
The gasification power generation system according to claim 1, comprising: a gasification furnace that generates a combustible gas by heating a solid carbonaceous material; and an engine power generation device that generates power by supplying the combustible gas. An induction draft fan is provided immediately before the engine power generator on the gas flow path of the combustible gas from the converter to the engine power generator, and impurities attached to the fan from the combustible gas are provided in the fan. A cleaning device that is removed by a cleaning liquid is provided, and a suction port and a discharge port for the combustible gas are respectively provided at the upper and lower portions of the blower to form a downward gas flow, and in the vicinity of the suction port, the cleaning device An inlet for supplying the cleaning liquid from the blower to the blower is opened, and a liquid reservoir is provided on the downstream side of the discharge outlet to allow the filthy liquid after the cleaning to flow in. The cleaning device returns from the liquid reservoir. And a cleaning pump provided in the middle of the feed liquid path from the storage tank to the inlet, and the cleaning pump allows impurities from the sewage to be stored in the storage tank. The cleaning liquid regenerated by removing water is pumped to the inlet through the feed liquid path to circulate the cleaning liquid between the blower and the storage tank to remove impurities in the blower.
According to a second aspect of the present invention, in the storage tank, a strainer is provided in the suction portion of the feed liquid path, and the strainer is disposed above the bottom surface of the storage tank.
According to a third aspect of the present invention, the cleaning device includes a drain mechanism that causes the water in the sewage to flow upward from a drain outlet of the drainage pipe along a drainage pipe extending upward from the storage tank, and the drainage pipe The drain inlet for taking water into the tank is disposed above and spaced from the bottom surface of the storage tank.
In claim 4 , the cleaning liquid having a specific gravity smaller than that of water is used to form a cleaning liquid layer and an aqueous layer above and below the storage tank, and only the cleaning liquid layer is formed in the drain mechanism. The first pressure head given to the upper edge of the drain inlet and the second pressure head given to the upper edge by the water in the drain pipe from the upper edge to the lower edge of the drain outlet are substantially equal. The height position of the lower edge is set.
In Claim 5 , the said gasification power generation system is provided with the controller which controls operation | movement of the said gasification furnace, and immediately after completion | finish of operation | movement of the said gasification furnace, while operating the said washing | cleaning apparatus, the said air blower automatically Is controlled at a lower speed than during operation of the gasifier.
According to a sixth aspect of the present invention, the gasification power generation system includes a controller that controls the operation of the gasification furnace, and is provided at the drain outlet when the drain mechanism is operated before the operation of the gasification furnace is started. In addition, the control valve is configured to open the overflow valve and open the air release valve that releases the air pressure in the storage tank to the atmosphere.

Since this invention was comprised as mentioned above, there exists an effect shown below.
According to claim 1, without causing malfunction in the blower due to impurities in the flammable gas, the blower maintains a negative pressure in the gasification furnace and the gas flow path from the gasification furnace to the blower. The gas material can be introduced into the gasification furnace, and the combustible gas can be stably generated while preventing leakage of the combustible gas from the gaps between the connecting portions of the constituent members. The power generation efficiency of the power generation system is greatly improved.
In addition , by causing the cleaning liquid to flow down from the suction port of the blower toward the discharge port, the cleaning liquid is less likely to accumulate in the blower, and the cleaning liquid that has flowed down is allowed to flow into the liquid reservoir as it is, so that the cleaning liquid is downstream from the liquid pool. It is possible to prevent the gas from flowing into the gas flow channel on the side, and it is possible to increase the cleaning liquid recovery efficiency and reduce the cleaning cost.
Further , the cleaning liquid can be circulated and reused, and the cleaning cost can be further reduced.
According to the second aspect of the present invention, it is possible to prevent the strainer from being clogged and the purity of the regenerated cleaning liquid from being reduced by sucking in the impurities, and it is possible to reliably prevent the cleaning performance of the cleaning apparatus from being deteriorated.
According to the third aspect , the drain inlet can be prevented from being clogged with impurities, and the drainage capacity of the drain mechanism can be reliably prevented from being lowered.
According to claim 4 , the water in the lower water layer is allowed to overflow from the drain outlet through the drain pipe and drain until the lower surface of the upper cleaning liquid layer descends to the upper edge of the drain inlet. This eliminates the need for a sensor, a control device, or the like for automatically stopping drainage, thereby reducing the device cost.
According to the fifth aspect , impurities adhered and stuck to the drive unit are easily separated thermally by the residual heat immediately after the operation of the gasification furnace, and centrifugal force or Impurities can be easily separated by mechanical impact, and the cleaning ability of the cleaning device can be improved. According to the sixth aspect of the present invention, the drain mechanism can be operated by a simple operation of opening only the overflow valve and the atmosphere release valve, a complicated switch device is not required, and the device cost can be further reduced. .

It is a mimetic diagram showing the whole gasification power generation system composition concerning the present invention. It is a side view of a washing | cleaning apparatus. It is side surface sectional drawing of the blower part in an induction blower. It is side surface sectional drawing of a storage tank. FIG. 5A is a side sectional view of the drain mechanism in the middle of draining, and FIG. 5B is a side sectional view of the drain mechanism at the end of draining. It is explanatory drawing of the control process of a washing | cleaning apparatus.

  Hereinafter, embodiments of the present invention will be described in detail. First, the overall configuration of a gasification power generation system 1 according to the present invention will be described with reference to FIG.

  The gasification power generation system 1 includes an input hopper 2, an input conveyor 3, a gasification furnace 4, a cyclone 5, a heat exchanger 6, a cooling tower 7, a water tank 8, a scrubber 9, a filter 10, an induction blower 11, and a pretreatment unit. 12, the engine power generation device 13, the surplus gas combustion device 15, and the like. And the biogas as combustible gas produced | generated in the said gasification furnace 4 flows in order of the cyclone 5, the heat exchanger 6, the scrubber 9, the filter 10, and the induction blower 11, and in the downstream of this induction blower 11, It branches and flows into the engine power generation device 13 side and the surplus gas combustion device 15 side.

  Biomass as a solid carbonaceous material is stored in the input hopper 2, and the biomass in the input hopper 2 is input into the gasification furnace 4 by the input conveyor 3. Here, the solid carbonaceous material includes not only biomass such as livestock excrement, food waste, paper, black liquor, sewage sludge, wood-based waste / unused material, agricultural non-edible parts, resource crops, etc. Other fossil fuels are also used.

  In the gasification furnace 4, the biomass is incompletely burned to generate biogas. The produced biogas is introduced into the cyclone 5 through the gas pipe 16. This biogas is a combustible gas mainly composed of carbon monoxide, and contains impurities such as soot, tar, and dust described above.

  In the cyclone 5, relatively large dust contained in the biogas is removed by centrifugation. The biogas from which large dust and the like have been removed by the cyclone 5 is introduced into the heat exchanger 6 through the gas pipe 17.

  A gas pipe (not shown) through which biogas flows is provided in the heat exchanger 6, and the biogas in the gas pipe is washed with cooling water and cooled, and cooling that flows around the gas pipe Cooled with water. The biogas cleaned and cooled by the heat exchanger 6 is introduced into the scrubber 9 through the gas pipe 18.

  Washing water is stored in the scrubber 9, and the biogas is washed and cooled by diving in the washing water in the scrubber 9. The biogas cleaned and cooled by the scrubber 9 is introduced into the filter 10 through the gas pipe 25.

  Here, the cooling water supplied to the heat exchanger 6 is stored in the cooling tower 7, and the cooling water in the cooling tower 7 is introduced into the heat exchanger 6 through the water distribution pipe 19. Then, the cooling water in the water distribution pipe 19 is pumped to the heat exchanger 6 side by the pump 20, and the cooling water after the biogas is cooled by the heat exchanger 6 is collected in the cooling tower 7 by the water distribution pipe 21. I try to do it.

  Further, the wash water supplied to the heat exchanger 6 and the scrubber 9 is stored in the water storage tank 8, and the wash water in the water storage tank 8 is introduced into the heat exchanger 6 through the water distribution pipe 22. The scrubber 9 is introduced by a water distribution pipe 26 branched from the middle of the water distribution pipe 22. The wash water in the water distribution pipe 22 is pumped to the heat exchanger 6 side and the scrubber 9 side by the pump 23, and the wash water washed and cooled by the heat exchanger 6 is stored in the water tank by the water distribution pipe 24. On the other hand, the wash water that has been biogas washed and cooled by the scrubber 9 is collected in the water storage tank 8 by the distribution pipe 27.

  In the filter 10, relatively small dust contained in the biogas is removed by filtration. The biogas from which small dust and the like have been removed by the filter 10 is introduced into the attracting blower 11 as a blower through a gas pipe 49.

  In the attraction blower 11, the biogas upstream of the attraction blower 11 is introduced from the gas pipe 63 into the engine power generation device 13 through the pretreatment unit 12 by the configuration described later. On the other hand, surplus biogas is introduced into the surplus gas combustion device 15 through the gas pipe 30 branched from the middle of the gas pipe 63. The attracting blower 11 is provided with a cleaning device 60 described later.

  The engine power generator 13 includes a gas engine using biogas as a fuel, a power generator driven by the gas engine, and the like. The engine power generation device 13 of the present embodiment is a cogeneration system that generates power with the power generation device and uses the exhaust heat of the gas engine for hot water supply or air conditioning. The engine power generation device 13 is supplied with biogas from which impurities have been removed by the pretreatment unit 12.

  In the surplus gas combustion device 15, surplus biogas sent from the gas pipe 30 is combusted.

  Next, the attracting blower 11 will be described with reference to FIGS. The attraction blower 11 includes a blower unit 41 that sucks and discharges biogas generated in the gasification furnace 4, and a motor unit 42 that drives the blower unit 41. The motor unit 42 and the blower unit 41 is fixed on a blower base 56 placed and fixed on a base 55.

  In the blower portion 41, a blower chamber 44 having an elliptical shape when viewed from the side is formed in the casing 43, and the two rotors 45 and 46 are partially installed in the blower chamber 44. In addition, the rotor shaft 45 a of the first rotor 45 and the rotor shaft 46 a of the second rotor 46 are supported in parallel by the casing 43.

  A suction port 47 is opened at the upper part of the casing 43, and the suction port 47 is connected to the gas pipe 49 from the outlet side of the filter 10, while the lower part of the casing 43 is directly below the suction port 47. On the other hand, a discharge port 48 is opened, and the discharge port 48 is connected to a gas pipe 50 bent in an L shape in a side view.

  In the motor portion 42, an output shaft 54 projects from the motor 57 in parallel with the rotor shafts 45a and 46a, and an output pulley 51 and an input pulley 52 are fixed to the output shaft 54 and the rotor shaft 45a, respectively. In addition, a belt 53 is wound between the input pulley 52 and the output pulley 51.

In such a configuration, when the motor 57 is driven, rotational power is transmitted to the rotor shaft 45a via the output shaft 54, the output pulley 51, the belt 53, and the input pulley 52, and the first rotor on the rotor shaft 45a. 45 rotates in the direction of arrow 58, and accordingly, the second rotor 46 rotates in the direction of arrow 59. Then, the biogas confined between the inner wall of the casing 43 and the rotors 45 and 46 in the blower chamber 44 is transferred from the suction port 47 side to the discharge port 48 side, and passes through the discharge port 48 to form a gas pipe. It is extruded into 50 vertical pipe portions 50a.

  As a result, the biogas on the upstream side of the induction blower 11 is sucked and discharged downstream. As a result, in the gasification power generation system 1, the upstream side of the induction blower 11 has a negative pressure, but the downstream side of the induction blower 11. Since the side has a positive pressure, the biogas upstream from the attracting blower 11 can be attracted downstream via the attracting blower 11.

  Next, the cleaning device 60 provided alongside the induction blower 11 as described above will be described with reference to FIGS. The cleaning device 60 stores a cleaning liquid after cleaning the inside of the induction blower 11 and a mixed liquid of impurities and the like (hereinafter referred to as “dirt liquid”) through the return liquid path 66 for storage. And a cleaning pump 62 for pressure-feeding the cleaning liquid regenerated from the waste liquid in the storage tank 61 to the attraction blower 11 through a feed liquid path 67.

  One end of the return liquid path 66 extends into the storage tank 61, and the other end is connected to a liquid reservoir 64 into which the sewage flowing from the induction blower 11 through the gas pipe 50 flows. Here, the gas pipe 63 communicating with the pretreatment unit 12 is connected to the end of the horizontal pipe portion 50b of the gas pipe 50 through flanges 50c and 63a. The branch pipe part 63b is branched and suspended downward, and the liquid pool 64 is formed in a space below the branch inlet to the branch pipe part 63b. Between the liquid reservoir 64 and the other end of the return liquid path 66, a dirty liquid cutoff valve 68 capable of blocking the inflow of biogas into the storage tank 61 is interposed.

  Further, one end of the feed liquid passage 67 extends into the storage tank 61 and is immersed in the cleaning liquid, while the other end opens into the gas pipe 49 in the vicinity of the suction port 47 to the induction blower 11. Connected to the inlet 65. A cleaning liquid shut-off valve 69 capable of interrupting the flow of the regenerated cleaning liquid is interposed between one end of the feed liquid path 67 and the cleaning pump 62.

  In such a configuration, when the cleaning pump 62 is driven with the shut-off valves 68 and 69 opened, the cleaning liquid regenerated by being stationaryly separated in the storage tank 61 passes through the feed liquid path 67 and is injected into the inlet. It is supplied from 65 to the attraction blower 11.

  Then, the cleaning liquid flows down from the suction port 47 toward the discharge port 48 while washing away impurities adhering to and sticking to the inner wall of the casing 43 and the rotors 45 and 46 from the biogas. 50 flows into the liquid reservoir 64 of the gas pipe 63. The sewage from the liquid reservoir 64 is collected in the storage tank 61 through the return liquid passage 66, and the cleaning process is performed by repeating this. Then, the cleaning liquid is regenerated from the collected waste liquid by stationary separation in the storage tank 61.

  That is, in a gasification power generation system 1 including a gasification furnace 4 that heats a solid carbonaceous material to generate biogas that is a flammable gas, and an engine power generation device 13 that supplies the biogas to generate power, An induction blower 11, which is an induction blower, is provided on the biogas gas flow path from the gasification furnace 4 to the engine power generation device 13 immediately before the engine power generation device 13. Since the cleaning device 60 for removing impurities adhering from the biogas into the attracting blower 11 by the cleaning liquid is provided, the malfunctioning due to the impurities in the biogas does not occur in the attracting blower 11, and the attracting blower 11 gasifies the gas. A negative pressure is applied to the inside of the gas pipes 16, 17, 18, 25, and 49 as a gas flow path from the furnace 4 to the induction blower 11. The gas material can be introduced into the gasification furnace 4 while being held, and the biogas can be stably generated while preventing leakage of the biogas from the gaps between the connecting portions of the constituent members. The power generation efficiency of the gasification power generation system 1 is greatly improved.

  Further, the biogas suction port 47 and the discharge port 48 are respectively provided at the upper and lower portions of the attracting blower 11 to form a downward gas flow, and in the vicinity of the suction port 47, the attracting blower from the cleaning device 60 is provided. 11 is opened, and a liquid reservoir 64 into which the filthy liquid after washing flows is provided on the downstream side of the discharge port 48, so that the cleaning liquid is discharged from the suction port 47 of the induction blower 11 to the discharge port. By flowing down toward 48, the cleaning liquid does not easily accumulate in the attracting blower 11, and the flowing cleaning liquid flows into the liquid reservoir 64 as it is, so that the cleaning liquid flows into the gas flow path downstream of the liquid reservoir 64. It is possible to prevent the liquid from flowing out, and it is possible to increase the cleaning liquid recovery efficiency and reduce the cleaning cost.

  In addition, the cleaning device 60 includes a storage tank 61 that stores and stores the sewage from the liquid reservoir 64 via the return liquid path 66, and a feed liquid path 67 from the storage tank 61 to the inlet 65. A cleaning pump 62 provided in the section is provided, and the cleaning pump 62 pumps the cleaning liquid regenerated by removing impurities and water from the waste liquid in the storage tank 61 to the inlet 65 through the feed liquid path 67. By doing so, the cleaning liquid is circulated between the induction blower 11 and the storage tank 61 to remove impurities in the induction blower 11, so that the cleaning liquid can be circulated and reused, and the cleaning cost can be further reduced. Can do.

  Next, the storage tank 61 and the drain mechanism 70 will be described in detail with reference to FIGS. 2, 4, and 5. The storage tank 61 is composed of a bottomed rectangular tube-shaped tank body 71 and a plate-like lid body 72 that closes the upper opening of the tank body 71. A liquid pipe 66a constituting one end of the liquid pipe 66a is inserted in an airtight manner, and a lower end opening of the liquid pipe 66a is opened in the tank body 71. Similarly, a liquid pipe 67a that constitutes one end of the feed liquid path 67 is also hermetically inserted into the standing part 72a on the upper surface of the lid 72, and at the suction part 67b at the tip of the liquid pipe 67a, A strainer 77 that separates and removes foreign matter, dust, and the like in the sewage is provided. Further, the lid 72 is provided with an air release valve 80 capable of opening and closing the upper space of the sewage in the storage tank 61 to the outside.

  Here, in this embodiment, an oily cleaning liquid having excellent solubility with respect to the impurities is used as the cleaning liquid, and the sewage flowing into the storage tank 61 from the liquid pipe 66a is allowed to stand for a long time. If there is a specific gravity difference between oil and water, a cleaning liquid layer 74 in which a light cleaning liquid component floats and collects, and a water layer 75 in which moisture contained in biogas descends and collects under the cleaning liquid layer 74, Separated. Impurities containing a large amount of solid and having the highest specific gravity in the sewage settle in the lower water layer 75 and accumulate on the bottom surface 71 a of the tank body 71 to form an impurity mass 76.

  The strainer 77 is disposed in the cleaning liquid layer 74, and only the cleaning liquid is sucked from the suction portion 67b. Further, the strainer 77 is disposed at a position away from the bottom surface 71a of the storage tank 61, and impurities in the impurity mass 76 on the bottom surface 71a are sucked around the strainer 77 generated when the cleaning pump 62 is operated. Therefore, it is possible to avoid being accidentally caught and sucked into the strainer 77 together with the suction flow.

  That is, in the storage tank 61, a strainer 77 is provided in the suction portion 67 b of the feed liquid passage 67, and the strainer 77 is disposed above the bottom surface 71 a of the storage tank 61 so as to suck in impurities. As a result, the strainer 77 can be prevented from being clogged or the purity of the regenerated cleaning liquid can be prevented from being deteriorated, and the deterioration of the cleaning ability of the cleaning device 60 can be reliably prevented.

  In this embodiment, the strainer 77 has a lower end height position set near the two-layer interface 78 between the cleaning liquid layer 74 and the water layer 75, but from the viewpoint of preventing impurity inhalation. Is preferably set at a height position in the vicinity of the cleaning liquid surface 74 a of the cleaning liquid layer 74.

  In addition, a drain pipe 73 having an S-shape in side view is communicated with the side wall of the tank body 71. The drainage pipe 73 includes a lower horizontal pipe part 73a extending horizontally from the tank body 71, a standing pipe part 73b extending upward from the tip of the lower horizontal pipe part 73a, and the standing pipe part 73b. The upper horizontal pipe portion 73c extends horizontally from the upper end again, and the upper horizontal pipe portion 73c can be opened and closed to the outside through an overflow valve 79.

  In such a configuration, the following pressure balance is established at the upper edge portion 73f of the drain inlet 73d formed by opening the base portion of the lower horizontal pipe portion 73a into the tank body 71.

  As shown in FIGS. 2 and 4, after the attraction blower 11 is washed, the dirt shut-off valve 68, the wash liquid shut-off valve 69, the overflow valve 79, and the air release valve 80 are all closed. When the liquid is allowed to stand, it is separated into two upper and lower layers of the cleaning liquid layer 74 and the water layer 75 as described above, and a sealed space is formed above the cleaning liquid layer 74. The sum of the internal pressure P1 in the sealed space, the pressure head H1 from the two-layer interface 78 to the cleaning liquid surface 74a, and the pressure head H3 from the upper edge 73f to the two-layer interface 78 is the upper edge. The pressure head H2 from the portion 73f to the water surface 75a of the drain outlet 73e in the upper horizontal pipe portion 73c is substantially equal.

  Subsequently, draining is performed by opening only the overflow valve 79 and the air release valve 80 while the dirty liquid cutoff valve 68 and the cleaning liquid cutoff valve 69 are closed. Then, as shown in FIG. 5A, water in the water layer 75 overflows and drains from the overflow valve 79 through the drain pipe 73, and the cleaning liquid surface 74a descends from the height position 84 accordingly. The water surface 75a in the drain pipe 73 also descends from the height position 86.

  At this time, since the same atmospheric pressure P0 is applied to the cleaning liquid surface 74a in the storage tank 61 and the water surface 75a of the drain outlet 73e, the sum (H1 + H3) of the pressure head H1 and the pressure head H3 is the pressure. As long as it is larger than the water head H2, drainage continues. At this time, while the two-layer interface 78 descends to the upper edge portion 73f of the drain inlet 73d, the pressure head H3 due to the water layer 75 gradually decreases due to drainage, while the pressure head H1 due to the cleaning liquid layer 74 is reduced to the cleaning liquid. Since the amount of the cleaning liquid does not change greatly due to the circulation use, it is kept substantially constant.

  In such drainage, in order to drain as much water as possible in the water layer 75 while preventing the cleaning liquid in the cleaning liquid layer 74 from being taken into the drain pipe 73 from the drain inlet 73d, FIG. As shown, when the water surface 75a in the drain pipe 73 descends to the lower edge 73g of the drain outlet 73e and draining is completed, the descent of the two-layer interface 78 also stops at the upper edge 73f of the drain inlet 73d. You can do it. That is, the lower edge of the drain outlet 73e so that the pressure head H2 (hereinafter referred to as “pressure head H2a”) from the upper edge 73f to the lower edge 73g of the drain outlet 73e is substantially equal to the pressure head H1. What is necessary is just to set the height position h of the part 73g.

  If the lower edge portion 73g is lower than the height position h, the pressure head H2 in the drain pipe 73 is too small, and even the cleaning liquid in the cleaning liquid layer 74 enters the drain pipe 73 at the drain inlet 73d. The washed liquid overflows from the drain outlet 73e together with water. On the contrary, if the lower edge 73g is higher than the height position h, the pressure head H2 in the drain pipe 73 is too large, and the water in the water layer 75 cannot enter the drain pipe 73 at the drain inlet 73d. Can't drain the water sufficiently.

  In this way, the cleaning liquid surface 74a descends from the height position 84 to the height position 85 and drains all the water above the upper edge portion 73f of the drain inlet 73d, and at the same time, the water surface 75a in the drain pipe 73. Is lowered from the height position 86 to the height position 87, and the overflow of water from the drain outlet 73e can be automatically stopped.

  Further, in the drain mechanism 70 having such a configuration, a drain inlet 73d to the drain pipe 73 is disposed at a position away from the bottom surface 71a of the storage tank 61, and the impurity mass 76 on the bottom surface 71a is in the impurity mass 76. It is possible to avoid that the impurities are trapped in the suction flow around the drain inlet 73d generated when draining and sucked into the drain inlet 73d.

  That is, the cleaning device 60 includes a drain mechanism 70 that causes the water in the sewage to flow through the drain pipe 73 extending upward from the storage tank 61 and overflow from the drain outlet 73e of the drain pipe 73, Since the drain inlet 73d for taking water into the drainage pipe 73 is disposed above and spaced apart from the bottom surface 71a of the storage tank 61, the drain inlet 73d can be prevented from being clogged with impurities, and the drainage of the drain mechanism 70 can be prevented. It is possible to reliably prevent a decrease in capacity.

  Further, the cleaning liquid having a specific gravity smaller than that of water is used to form the cleaning liquid layer 74 and the water layer 75 above and below the storage tank 61. In the drain mechanism 70, only the cleaning liquid layer 74 is provided. The pressure head H1 which is the first pressure head to be given to the upper edge portion 73f of the drain inlet 73d, and the water in the drain pipe 73 from the upper edge portion 73f to the lower edge portion 73g of the drain outlet 73e are the upper edge portion 73f. Since the height position h of the lower edge portion 73g is set so that the pressure head H2a, which is the second pressure head given to the liquid, becomes substantially equal, the two-layer interface 78, which is the lower surface of the cleaning liquid layer 74 in the upper layer, is drained. Only until it descends to the upper edge 73f of the inlet 73d, the water in the lower water layer 75 can be drained through the drain pipe 73 from the drain outlet 73e, and the drainage is automatically stopped. Do Or the like becomes unnecessary because the sensor or the control device, it is possible to reduce the apparatus cost.

  Next, the control process of the cleaning apparatus 60 having the above configuration will be described with reference to FIGS. As shown in FIGS. 1 and 2, the gasification power generation system 1 is provided with a controller 81 for starting and stopping the gasification furnace 4 by transmitting a gasification furnace start signal to the gasification furnace 4. The controller 81 includes an operation switch 83 for transmitting an operation signal instructing start / stop of the gasification furnace 4 to the controller 81, an inverter 82 for supplying electric power to the motor 57 of the induction blower 11, and the feed liquid path 67. The cleaning pump 62 for pumping the cleaning liquid to the induction blower 11 via the sluice, and the solenoids (not shown) of the dirty liquid blocking valve 68, the cleaning liquid blocking valve 69, the overflow valve 79, and the air release valve 80 are connected.

  In such a configuration, as shown in FIG. 6, when the operation switch 83 is set to “ON” at time T1, a gasifier starting signal is transmitted from the operation switch 83 to the controller 81. , Transmission to the gasifier 4 is delayed until time T3. At the same time, a valve opening signal is transmitted from the controller 81 to the solenoids of the overflow valve 79 and the atmosphere release valve 80, and only the overflow valve 79 and the atmosphere release valve 80 are opened. Then, the drain mechanism 70 described above is operated, and drainage from the drain pipe 73 through the open overflow valve 79 becomes possible, and drainage is started. The drainage is automatically stopped by the time point T2.

  At time T2, the controller 81 transmits a valve closing signal to the solenoids of the overflow valve 79 and the atmosphere release valve 80, the overflow valve 79 and the atmosphere release valve 80 are closed, and drainage is completed.

  Further, when the time elapses and the time point T3 is reached, the gasification furnace start signal is transmitted from the controller 81 to the gasification furnace 4, the gasification furnace 4 is started, and the gasification operation is started. At the same time, a normal operation signal is transmitted from the controller 81 to the inverter 82, and electric power is supplied from the inverter 82 to the induction blower 11. Then, the attracting blower 11 is normally operated, and the biogas upstream from the attracting blower 11 is attracted and introduced into the engine power generator 13.

  When the operation switch 83 is turned off at time T4, the gasifier start signal to the controller 81 is stopped, but transmission to the gasifier 4 is continued by the timer until time T5.

  At time T5, the transmission of the gasifier start signal from the controller 81 to the gasifier 4 is stopped, and the gasification operation ends. At the same time, the transmission of the normal operation signal from the controller 81 to the inverter 82 is stopped, the power supply from the inverter 82 to the induction blower 11 is stopped, and the introduction of biogas to the engine power generator 13 is stopped.

  Immediately after the end of the gasification operation, when a predetermined time elapses and the time T6 comes, a low-speed operation signal is automatically transmitted from the controller 81 to the inverter 82, which is smaller than that during normal operation from the inverter 82 to the motor 57. Electric power is supplied, and the induction blower 11 is operated at a lower speed than during normal operation. At this time, since the gasification furnace 4 has just finished operating, the remaining heat remains. At the same time, a valve opening signal is transmitted from the controller 81 to the solenoids of the dirty liquid cutoff valve 68 and the cleaning liquid cutoff valve 69, and only the dirty liquid cutoff valve 68 and the cleaning liquid cutoff valve 69 are opened. As a result, the cleaning device 60 is activated to start the cleaning process.

  In this state, at time T7, an operation signal is transmitted from the controller 81 to the cleaning pump 62. Then, the cleaning pump 62 is activated, and the cleaning liquid regenerated by stationary separation in the storage tank 61 is pumped to the attracting blower 11 through the feed liquid path 67.

  At time T8, transmission of the start signal from the controller 81 to the cleaning pump 62 is stopped, and the cleaning pump 62 is stopped.

  Further, when the time elapses and the time T9 is reached, the transmission of the low-speed operation signal from the controller 81 to the inverter 82 is stopped, the power supply from the inverter 82 to the induction blower 11 is also stopped, and the induction blower 11 is stopped. . At the same time, the dirty liquid shutoff valve 68 and the cleaning liquid shutoff valve 69 are closed, and all cleaning processes are completed.

  That is, the gasification power generation system 1 includes a controller 81 that controls the operation of the gasification furnace 4, and immediately after the operation of the gasification furnace 4 is activated, the cleaning device 60 is operated and a blower is automatically provided. The attracting blower 11 is controlled at a lower speed than during the operation of the gasification furnace 4, so that impurities adhering to and sticking to the drive part are thermally separated by the residual heat immediately after the operation of the gasification furnace 4 is completed. In addition, the low speed operation of the attracting blower 11 facilitates separation of impurities by centrifugal force or mechanical impact while preventing the cleaning liquid from being scattered, and the cleaning capability of the cleaning device 60 can be improved.

  Further, the gasification power generation system 1 is provided with a controller 81 for controlling the operation of the gasification furnace 4, and when the drain mechanism 70 is operated before the operation of the gasification furnace 4 is started, the drain outlet 73e. Since the control valve is configured to open the overflow valve 79 provided in the atmosphere and open the atmosphere release valve 80 for releasing the air pressure in the storage tank 61 to the atmosphere, only the overflow valve 79 and the atmosphere release valve 80 are opened. Thus, the drain mechanism 70 can be operated by a simple operation, a complicated switch device is not required, and the device cost can be further reduced.

  The present invention is applied to all gasification power generation systems including a gasification furnace that heats a solid carbonaceous material to generate a combustible gas and an engine power generation device that generates power by supplying the combustible gas. be able to.

1 Gasification Power Generation System 4 Gasification Furnace 11 Induction Blower (Induction Ventilation Blower)
13 Engine Power Generation Device 47 Suction Port 48 Discharge Port 60 Cleaning Device 61 Storage Tank 62 Cleaning Pump 64 Liquid Pool 65 Inlet 66 Return Liquid Channel 67 Feed Liquid Channel 67b Suction Unit 70 Drain Mechanism 71a Bottom Surface 73 Drain Pipe 73d Drain Inlet 73e Drain Outlet 73f Upper edge portion 73g Lower edge portion 74 Cleaning liquid layer 75 Water layer 77 Strainer 79 Overflow valve 80 Atmospheric release valve 81 Controller h Height position H1 Pressure head (first pressure head)
H2 pressure head (second pressure head)

Claims (6)

A gasification power generation system comprising: a gasification furnace that heats a solid carbonaceous material to generate a combustible gas; and an engine power generation apparatus that generates power by supplying the combustible gas. A cleaning device that is provided with an induction draft fan on the gas flow path of the flammable gas immediately before the engine power generator, and that removes impurities adhering to the inside of the blower from the flammable gas with a cleaning liquid. The suction port and the discharge port for the combustible gas are respectively provided at the upper and lower portions of the blower to form a downward gas flow, and the cleaning liquid is supplied from the cleaning device to the blower in the vicinity of the suction port. An inlet is formed, and a liquid reservoir into which the cleaned sewage flows is provided on the downstream side of the discharge port, and the cleaning device allows the sewage to flow from the liquid reservoir through a return liquid path. And a cleaning pump provided in the middle of the feed liquid path from the storage tank to the injection port, and the cleaning pump removes impurities and water from the sewage in the storage tank and regenerates it. A gasification power generation system characterized in that the cleaning liquid is circulated between the blower and the storage tank to remove impurities in the blower by pumping the cleaning liquid to the inlet through the feed liquid path .   2. The gasification power generation according to claim 1, wherein in the storage tank, a strainer is provided in the suction portion of the feed liquid path, and the strainer is disposed above and spaced apart from the bottom surface of the storage tank. system. The cleaning device has a drain mechanism that allows water in the sewage to flow upward from a drain outlet of the drain pipe through a drain pipe extending upward from the storage tank, and to drain the water into the drain pipe. The gasification power generation system according to claim 1 , wherein the gasification power generation system is disposed above and spaced apart from the bottom surface of the storage tank.   The cleaning liquid having a specific gravity smaller than that of water is used to form a cleaning liquid layer and an aqueous layer above and below the storage tank. In the drain mechanism, only the cleaning liquid layer is the upper edge of the drain inlet. The first pressure head given to the upper edge and the second pressure head given to the upper edge by the water in the drain pipe from the upper edge to the lower edge of the drain outlet are substantially equal. The gasification power generation system according to claim 3, wherein the position is set. The gasification power generation system includes a controller for controlling the operation of the gasification furnace, and immediately after the operation of the gasification furnace is completed, the cleaning device is operated and the blower is automatically operated in the gasification furnace. The gasification power generation system according to any one of claims 1 to 4, wherein the control configuration is configured to operate at a lower speed. The gasification power generation system includes a controller for controlling the operation of the gasification furnace, and when the drain mechanism is operated before the operation of the gasification furnace is started, an overflow valve provided at the drain outlet is opened. In addition, the gasification power generation according to any one of claims 3 to 5 , wherein the control structure is configured to open an air release valve for releasing the air pressure in the storage tank into the atmosphere. system.

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