JP6288841B2 - Water-cooled stoker device for waste incinerator and operation method thereof - Google Patents

Description

  The present invention mainly relates to improvements in a water-cooled stoker device for a waste incinerator for incinerating municipal waste and industrial waste, etc. and its operation method, and for cooling grate cooling water conventionally circulating in a water-cooled stoker. Instead of the cooling tower and ventilator used, an indirect heat exchanger and cold water (well water or rainwater) are used, and after cooling the grate cooling water with the indirect heat exchanger, the cold water is used in the waste incinerator. Wastewater incinerator water-cooled stoker device that can simplify equipment and reduce equipment costs and running costs by using it as spray water to an exhaust gas cooling chamber that is always installed in the exhaust gas discharge route, and its It relates to the driving method.

  Conventionally, as a water-cooled stoker device, for example, one having a structure disclosed in Japanese Patent Laid-Open No. 10-504890 (Patent Document 1) or Japanese Patent Application Laid-Open No. 2003-4218 (Patent Document 2) is known.

  That is, as shown in FIG. 4, the former water-cooled stalker apparatus A ′ has a water-cooled stalker B ′ in which a movable grate and a fixed grate are alternately arranged in parallel, and grate cooling water to the water-cooled stalker B ′. It is composed of a grate cooling water circulation / cooling mechanism C ′ that circulates and circulates.

  The grate cooling water circulation / cooling mechanism C 'includes a pump 40, a flow rate measuring device 41, an expansion vessel 42, a temperature measuring device 43, a pressure measuring device 44, a recooler 45, a ventilator 46, a pressure regulating valve 47, and the like. The grate cooling water supplied through the pressure regulating valve 47 is circulated and circulated by the pump 40 to the water-cooled stalker B ′, and the grate cooling water flowing out from the water-cooled stalker B ′ is recooled by the recooler 45 and the ventilator 46. I'm trying to cool it down.

  However, the former water-cooled stoker device A ′ cools the grate cooling water by the recooler 45 and the ventilator 46, so that not only the cooling capacity is relatively low but also the responsiveness of the temperature control. There was a problem of being extremely bad. In addition, since the internal pressure of the grate cooling water system is controlled by adjusting the internal pressure of the expansion vessel 42 through operation control of a compressor (not shown), the pressure of the grate cooling water circulation / cooling mechanism C ′ is maintained. There were problems such as complicated mechanism structure and operation control operation.

  On the other hand, as shown in FIG. 5, the latter water-cooled stalker apparatus A ′ includes a water-cooled stalker B ′ formed by alternately combining a movable grate 50 and a fixed grate 51 in a stepped or inclined manner, and a water-cooled stalker. It comprises a grate cooling water circulation / cooling mechanism C ′ for circulating the grate cooling water W ′ to B ′.

  The grate cooling water circulation / cooling mechanism C ′ is composed of a grate cooling part C1 ′ and a cooling part C2 ′ of the grate cooling water W ′, and both cooling parts C1 ′ and C2 ′ are indirect heat. Thermally connected via the exchanger 52.

  That is, the grate cooling unit C1 ′ includes the grate cooling water tank 53, the pressurization circulation pump 54, the grate cooling water circulation amount control valve 55, the water supply side header 56, the drain side header 57, and the fire of the indirect heat exchanger 52. The grate cooling water side heat exchange element 52 a, the pressure control valve 58, the temperature controller 59, the temperature detector 59 a, the pressure controller 60, the pressure detector 60 a, and the like, and the grate in the grate cooling water tank 53. The cooling water W ′ is circulated and circulated to the water-cooled stalker B ′ by the pressurized circulation pump 54.

  On the other hand, the cooling part C2 ′ of the grate cooling water W ′ includes a cold water tank 61, a cold water circulation pump 62, a cold water circulation amount control valve 63, a cold water side heat exchange element 52b of the indirect heat exchanger 52, a cooling tower 64, a temperature. The chilled water Wo ′ in the chilled water tank 61 is sent to the chilled water side heat exchange element 52b of the indirect heat exchanger 52 by the chilled water circulation pump 62, and is configured by an indirect heat exchanger. The cold water Wo ′ after the grate cooling water W ′ is cooled in 52 is cooled by the cooling tower 64 and returned to the cold water tank 61.

  The latter water-cooled stoker device A ′ has a configuration in which the grate cooling part C1 ′ and the grate cooling water W ′ cooling part C2 ′ are completely divided by using the indirect heat exchanger 52. The problem of the water-cooled stoker device A ′ can be solved.

  However, the latter water-cooled stoker device A ′ has a problem that the equipment becomes complicated and the equipment cost increases because the cooling tower 64 is provided in the cooling part C2 ′ of the grate cooling water W ′.

  Further, in the circulating cooling water system using the cooling tower 64, the cold water Wo ′ is circulated and used, so that the cold water Wo ′ is concentrated by evaporation, and scale failure, corrosion failure, and slime failure are likely to occur. If an injection device (not shown) for injecting chemicals (corrosion inhibitor, anti-scale agent, anti-slime agent) into the cold water Wo ′ of the cooling part C2 ′ of the cooling water W ′ is required, the equipment cost will increase. There was a problem.

  Furthermore, since the chemical | medical agent is inject | poured into the cold water Wo 'of the cooling part C2' of the grate cooling water W ', there existed a problem that a running cost also increased.

  In addition, since the material of the filler used for the cooling tower 64 is generally polyvinyl chloride (PVC), the heat resistance limit is less than 45 ° C, and the heat resistance specification is 45 ° C to 70 ° C. If water that exceeds heat resistance flows in by mistake, the filler will buckle and need to be replaced. In this case, there was a problem that the furnace was forced to shut down and a replacement cost was incurred.

Japanese National Patent Publication No. 10-504890 JP 2003-4218 A

  The present invention has been made in view of such problems, and its purpose is to use an indirect heat exchanger and cold water (well water or rainwater), and to add grate cooling water with the indirect heat exchanger. By using the chilled water after cooling as spray water to the exhaust gas cooling chamber installed in the exhaust gas discharge path of the garbage incinerator, the cooling tower can be reduced, and the chemical injection device and chemical are not required. It is an object of the present invention to provide a water-cooled stoker device for a waste incinerator and a method for operating the same, which can be simplified and can reduce facility costs and running costs.

  In order to achieve the above object, the invention of claim 1 of the present invention comprises a water-cooled stoker comprising a movable grate and a fixed grate, each having a grate cooling water passage formed in a stepwise or inclined manner, In a water-cooled stoker device for a refuse incinerator configured to circulate and circulate grate cooling water to a water-cooled stoker, the grate cooling water circulation / cooling mechanism is a grate cooling water circulation / cooling mechanism. The grate cooling unit for circulating and circulating the cooling water and the grate cooling water cooling unit for cooling the grate cooling water of the grate cooling unit with cold water are thermally connected via an indirect heat exchanger, and the grate cooling is performed. The water cooling unit is configured to supply cold water to a water injection supply device that injects water into an exhaust gas cooling chamber installed in an exhaust gas discharge path of a waste incinerator, and the grate cooling unit stores grate cooling water. Grate cooling water A grate cooling water circulation pump, a water supply side header for supplying grate cooling water to the grate cooling water passages of each movable grate and fixed grate, and grate cooling water from each grate cooling water passage And a grate cooling water side heat exchange element of an indirect heat exchanger that cools grate cooling water from the drain side header. A chilled water tank, a chilled water feed pump, a chilled water side heat exchange element of the indirect heat exchanger, a chilled water amount adjusting valve provided on the inlet side or the outlet side of the chilled water side heat exchange element, and an indirect heat exchanger It is characterized by comprising a temperature controller that controls the chilled water amount adjusting valve according to the detected temperature of the grate cooling water on the outlet side.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the grate cooling water circulation / cooling mechanism includes a heat utilization facility and a second indirect heat exchanger, The grate cooling water system of the grate cooling unit is characterized in that it is thermally connected via a second indirect heat exchanger provided between the indirect heat exchanger and the drainage side header.

  According to the third aspect of the present invention, there is provided a water-cooled stoker in which a movable grate and a fixed grate each having a grate cooling water passage are combined in a stepped or inclined manner, and a grate cooling water to the water-cooled stoker. In a water-cooled stoker device for a waste incinerator configured to circulate and circulate a grate cooling water circulation / cooling mechanism, the grate cooling water circulation / cooling mechanism is a grate for circulating grate cooling water. The cooling unit and the grate cooling water cooling unit that cools the grate cooling water of the grate cooling unit with cold water are thermally connected via an indirect heat exchanger, and the cold water of the grate cooling water cooling unit is incinerated with garbage. It is configured to supply to a water injection supply device that injects water into an exhaust gas cooling chamber installed in the exhaust gas discharge path of the furnace, and the grate cooling unit includes a grate cooling water tank that stores grate cooling water, Circulation cooling water circulation A water supply side header that supplies grate cooling water to the grate cooling water passages of each movable grate and fixed grate, a drain side header that drains the grate cooling water from each grate cooling water passage, A grate cooling water side heat exchange element of an indirect heat exchanger that cools grate cooling water from the side header, and the grate cooling water cooling unit includes a cold water tank that stores cold water, and water supply of the cold water Flow rate that controls the chilled water amount control valve according to the amount of water injected into the pump, the chilled water side heat exchange element of the indirect heat exchanger, the chilled water amount control valve provided on the inlet side of the chilled water side heat exchange element, and the exhaust gas cooling chamber A controller, a three-way valve that is provided on the outlet side or inlet side of the chilled water side heat exchange element and controls the flow of chilled water to the indirect heat exchanger, and a detected temperature of grate cooling water on the outlet side of the indirect heat exchanger Temperature controller that controls the three-way valve by It is characterized by consisting of.

  According to a fourth aspect of the present invention, in the water-cooled stoker device for a waste incinerator according to the first aspect, the grate cooling water in the grate cooling water tank is well water or clean water, After the water is pumped by a grate cooling water circulation pump and passed through a water-cooled stoker, it is cooled by an indirect heat exchanger and returned to the grate cooling water tank, and the cold water in the cooling tank is made into well water or rain water, Well water or rainwater is pumped to an indirect heat exchanger by a chilled water pump and used for cooling grate cooling water, and then supplied to a water jet supply device in an exhaust gas cooling chamber to be used as jet water in the exhaust gas cooling chamber. It is characterized by doing so.

  The invention according to claim 5 of the present invention is the invention according to claim 4, wherein the grate cooling water before entering the indirect heat exchanger is passed through the second indirect heat exchanger, where It is characterized by being cooled by cooling water or cooling air.

  The invention according to claim 6 of the present invention is the water-cooled stoker device for a refuse incinerator according to claim 3, wherein the grate cooling water in the grate cooling water tank is well water or clean water, The water is pumped by a grate cooling water circulation pump and passed through a water-cooled stalker, then cooled by an indirect heat exchanger and returned to the grate cooling water tank, and the cooling water in the cooling tank is used as rainwater. After being pumped to the indirect heat exchanger by a water pump and used for cooling the grate cooling water, the rainwater is supplied to the water jet supply device of the exhaust gas cooling chamber and used as the jet water of the exhaust gas cooling chamber. Controls the amount of rainwater by controlling the cold water amount control valve according to the water injection flow rate to the exhaust gas cooling chamber, and controls the three-way valve based on the detected temperature of the grate cooling water on the outlet side of the indirect heat exchanger To control the flow of rainwater to the indirect heat exchanger It is characterized in the that.

The present invention relates to a grate cooling unit that circulates and distributes grate cooling water to a water-cooled stoker device and a grate cooling water cooling unit that cools grate cooling water of the grate cooling unit with cold water via an indirect heat exchanger. The cooling water in the grate cooling water cooling section is used to cool the grate cooling water with an indirect heat exchanger, and then supplied to the water jet supply device in the exhaust gas cooling chamber to inject the exhaust gas cooling chamber. Since it is used as water, it is not necessary to cool the cooling water used for cooling the grate cooling water with the cooling tower as in the prior art described above, and the number of cooling towers in the cooling part of the grate cooling water is reduced. Therefore, the equipment can be simplified and the equipment cost can be reduced.
In addition, since the present invention has reduced the number of cooling towers, it is no longer necessary to inject a medicine into the cold water of the grate cooling water cooling unit, and the equipment for injecting the medicine becomes unnecessary, thereby further reducing the equipment cost. In addition, it is possible to reduce running costs by eliminating the need for chemicals.
Furthermore, since the present invention does not use a cooling tower, the risk of buckling of the filler used in the cooling tower can be avoided.
Moreover, the present invention passes the grate cooling water before entering the indirect heat exchanger through the second indirect heat exchanger where it is cooled by cooling water from the heat utilization equipment, cooling air, heat transfer oil or low boiling point medium. Therefore, effective use of thermal energy can be achieved.
In addition, since well water or rainwater is used as cold water, the present invention can achieve cost reduction as compared with the prior art using clean water as cold water.

1 is a schematic system diagram of a water-cooled stoker device for a waste incinerator according to a first embodiment of the present invention. It is a schematic system diagram of the water-cooled stoker device for the waste incinerator according to the second embodiment of the present invention. It is a schematic system diagram of the water-cooled stoker device for the refuse incinerator according to the third embodiment of the present invention. It is a schematic system diagram which shows an example of the conventional water-cooled stoker device. It is a schematic system diagram which similarly shows the other example of the conventional water-cooled stoker apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a schematic system diagram of a water-cooled stoker device A of a waste incinerator D according to a first embodiment of the present invention. The water-cooled stoker device A of the waste incinerator D has a grate cooling water passage (illustrated). A water-cooled stoker B formed by combining the movable grate 1 and the fixed grate 2 formed in a stepped or inclined manner, and a fire that cools the grate cooling water W through the water-cooled stoker B in a circulating manner. It comprises a lattice cooling water circulation / cooling mechanism C.

That is, the water-cooled stoker B combines a plurality of water-cooled grate bodies 3 having cooling water passages (not shown) in parallel and connects the cooling water passages of adjacent water-cooled grate bodies 3 together. Are constructed by combining a plurality of movable grate 1 and fixed grate 2 formed by forming a continuous grate cooling water passage (not shown) in a staircase shape or an inclined shape. Waste such as municipal waste moves in the direction of the arrow by the operation of the grate 1.
Since this water-cooled stalker B has the same structure as a conventionally known one, detailed description thereof is omitted here.
The type and structure of the water-cooled stoker B may be any as long as it has a grate cooling water passage.

  On the other hand, the grate cooling water circulation / cooling mechanism C includes a grate cooling unit C1 that circulates and distributes the grate cooling water W and a grate cooling water cooling unit that cools the grate cooling water W of the grate cooling unit C1 with the cold water Wo. C2 is thermally coupled with the indirect heat exchanger 4 and the cold water Wo of the grate cooling water cooling unit C2 used in the indirect heat exchanger 4 is installed in the exhaust gas discharge path of the garbage incinerator D. It is set as the structure supplied to the water injection supply apparatus F which injects water into the exhaust gas cooling chamber E.

  The exhaust gas cooling chamber E is always installed in the exhaust gas discharge path of the waste incinerator D, and the exhaust gas discharged from the waste incinerator D and heat recovered by a waste heat boiler or the like is guided into the exhaust gas cooling chamber E, Here, water is injected into the exhaust gas cooling chamber E by the water injection supply device F to reduce the temperature of the exhaust gas to a temperature suitable for exhaust gas treatment equipment such as a bag filter provided on the downstream side of the exhaust gas cooling chamber E. It is.

  The water injection supply device F in the exhaust gas cooling chamber E pumps the cold water Wo from the grate cooling water cooling unit C2 and the water injection tank 5 that stores rainwater or well water, and the cold water Wo in the water injection tank 5 by pressure. Water jet pump 6, a flow meter 7 provided downstream of the water jet pump 6, a water injection control valve 8 provided downstream of the flow meter 7, and water for injecting cold water Wo into the exhaust gas cooling chamber E An injection nozzle 9, an exhaust gas temperature detector 10 for detecting the gas temperature on the outlet side of the exhaust gas cooling chamber E, a temperature controller 11 for controlling the water injection control valve 8 based on the detected temperature of the exhaust gas temperature detector 10, It comprises a pipe 12 that connects the devices, and the amount of cold water Wo injected into the exhaust gas cooling chamber E is determined based on the detected temperature from the exhaust gas temperature detector 10 via the temperature controller 11. The exhaust gas cooling chamber E is controlled by adjusting It is obtained to keep the exhaust gas temperature on the outlet side to a predetermined temperature (a temperature suitable for the exhaust gas treatment equipment such as bag filter).

  The grate cooling unit C1 of the grate cooling water circulation / cooling mechanism C includes a grate cooling water tank 13 for storing the grate cooling water W, a circulation pump 14 for the grate cooling water W, and a grate cooling water W. A water supply side header 16 that supplies the grate cooling water passages of the movable grate 1 and the fixed grate 2, a drain side header 17 that drains the grate cooling water W from each grate cooling water passage, and a drain side header 17. The grate cooling water side heat exchange element 4a of the indirect heat exchanger 4 that cools the grate cooling water W from the pipe and the piping 21 that connects the devices to each other so as to circulate and circulate the grate cooling water W. It has become.

The grate cooling water tank 13 is formed as an open tank, in which well water or clean water is stored as grate cooling water W. In this embodiment, well water is stored in the grate cooling water tank 13.
Further, when the liquid level in the grate cooling water tank 13 becomes a set value or less, well water or clean water is supplied as the grate cooling water W.

  The grate cooling water W in the grate cooling water tank 13 is pumped by the circulation pump 14, passes through the water supply side header 16, and passes through the grate cooling water passages of the movable grate 1 and the fixed grate 2 of the water-cooled stoker B. The water-cooled stoker B is cooled and heated to about 35 ° C. (this temperature fluctuates depending on the combustion state in the furnace) and discharged to the drain side header 17, and about 20 ° C. by the cold water Wo in the indirect heat exchanger 4. After being indirectly cooled, the grate cooling water tank 13 is returned.

  Note that the grate cooling water system between the grate cooling water side heat exchange element 4a and the water inlet side of the circulation pump 14 is maintained at substantially the same pressure as the atmospheric pressure. As a result, the replenishment of the grate cooling water W to the grate cooling water tank 13 can be performed very easily.

Further, the grate cooling water W in the indirect heat exchanger 4 is cooled by a temperature detector 25a provided on the outlet side of the grate cooling water W of the indirect heat exchanger 4 as described later. , And the amount of cold water Wo to the indirect heat exchanger 4 is adjusted by adjusting the opening degree of the cold water amount adjustment valve 24 via the temperature controller 25 based on the detected temperature. .
Specifically, the temperature of the grate cooling water W returned from the indirect heat exchanger 4 to the grate cooling water tank 13 is about 20 ° C. (for example, the temperature of well water or rain water used in Wo is about 15 ° C. and + 5 ° C. Temperature).

  On the other hand, the grate cooling water cooling unit C2 of the grate cooling water circulation / cooling mechanism C includes a chilled water tank 22 for storing the chilled water Wo, a water supply pump 23 for the chilled water Wo, and a chilled water side heat exchange element of the indirect heat exchanger 4. 4b, a chilled water amount adjusting valve 24 provided on the inlet side (or outlet side) of the chilled water side heat exchange element 4b, and a chilled water amount adjusting valve 24 according to the detected temperature of the grate cooling water W on the outlet side of the indirect heat exchanger 4. The temperature controller 25 for controlling the water and the pipe 26 for connecting the devices to each other. After the cold water Wo is used for cooling the grate cooling water W by the indirect heat exchanger 4, the cold water Wo is used as a waste incinerator. The cooling water Wo is supplied to the water jet supply device F of the exhaust gas cooling chamber E that is always installed in the exhaust gas discharge path of D, and the cold water Wo is used as the jet water of the exhaust gas cooling chamber E.

The cold water tank 22 is formed as an open tank, in which well water or rain water is stored as cold water Wo.
Further, when the liquid level in the cold water tank 22 is equal to or lower than the set value, when well water is used as the cold water Wo, the well is replenished as cold water Wo by a well water pump (not shown) or the like.
A part of the cold water Wo in the cold water tank 22 is used as make-up water, humidified water, sprinkling water, etc. in the waste incineration plant via the branch pipe 26a.

  The cold water Wo in the cold water tank 22 is pumped by the water pump 23 and enters the indirect heat exchanger 4 through the cold water amount adjustment valve 24, where the grate cooling water W is cooled, and then the water in the water injection supply device F Enter into the injection tank 5.

At this time, the amount of the cold water Wo circulated to the indirect heat exchanger 4 is adjusted so that the temperature of the grate cooling water W after the indirect heat exchange becomes constant.
That is, the amount of the cold water Wo to the indirect heat exchanger 4 is adjusted by detecting the temperature of the grate cooling water W by the temperature detector 25a provided on the outlet side of the grate cooling water W of the indirect heat exchanger 4. This is done by adjusting the opening degree of the cold water amount adjusting valve 24 by the temperature controller 25 based on the detected temperature.
For example, when well water of about 15 ° C. is used as the grate cooling water W, the temperature of the grate cooling water W after indirect heat exchange is about 20 ° C. (about + 5 ° C.). The amount is adjusted by the cold water amount adjusting valve 24.

In this embodiment, the mounting position of the chilled water amount adjusting valve 24 is set to the inlet side of the chilled water side heat exchange element 4b. However, in other embodiments, the chilled water amount adjusting valve 24 is set to the outlet side of the chilled water side heat exchanging element 4b. You may make it attach to.
The indirect heat exchanger 4 may have any structure regardless of whether it is a plate type or a tube type, as long as it performs heat exchange in a state where the grate cooling water W and the cold water Wo are not mixed. It may be.

By the way, the heat transfer area of the indirect heat exchanger 4 is determined under the following conditions (all numerical values are examples).
・ Temperature of the grate cooling water W coming out of the water-cooled stoker B, that is, the temperature Thin at the inlet side of the indirect heat exchanger 4 (20 ° C. + 60 ° C. of the temperature increase included in the water-cooled grate) = 80 ℃
-Inlet heat exchanger 4 outlet water temperature Thout = 20 ° C
・ Grate cooling water volume Wh (t / h)
-Cold water temperature Tcin at the inlet of the indirect heat exchanger 4 = temperature of well water or rain water (15 ° C)
・ The chilled water temperature Tcout at the outlet of the indirect heat exchanger 4 is below the temperature that does not cause cavitation even if a general centrifugal pump is installed at the same level as the tank (for example, 50 ° C or less).
An amount that prevents the amount of cold water Wc (t / h) to the indirect heat exchanger 4 from exceeding the designed water injection amount (Ww) to the exhaust gas cooling chamber E (for example, Wc = Ww × 0.9)
Here, x0.9 is set to prevent cold water from overflowing from the water jet tank 5.
That means
Exchange heat quantity in the indirect heat exchanger 4 on the grate cooling water side: Qh = Wh × (Thin−Thout)
Heat exchange amount in indirect heat exchanger 4 on the cooling side of the grate cooling water: Qc = Wc × (Tcout−Tcin)
Heat transfer area of indirect heat exchanger 4: S = Qh / U / ΔTm
Here, U is the overall heat transfer coefficient of the heat exchanger, and ΔTm is the logarithmic average temperature difference of the heat exchanger.
Since Qh = Qc, the heat transfer area S of the indirect heat exchanger 4 is determined so that the cold water temperature Tcout is 50 ° C. or less.
In this way, the heat transfer area of the indirect heat exchanger 4 is determined.

  If the heat transfer area of the indirect heat exchanger 4 is determined as described above, the water injection pump 6 of the water injection supply device F does not cause cavitation. Further, there is a difference between the cold water amount Wc and the designed water injection amount Ww to the exhaust gas cooling chamber E, and the water level of the water injection tank 5 fluctuates. However, the water injection tank 5 itself has a level control function (for example, a ball tap). If a formula, contact type on, off control, etc.) are provided, there is no problem.

Thus, in the above-described water-cooled stoker device A of the waste incinerator D, after using the cold water Wo of the grate cooling water cooling section C2 for cooling the grate cooling water W by the indirect heat exchanger 4, Since it is supplied to the water injection supply device F of the exhaust gas cooling chamber E and used as the injection water of the exhaust gas cooling chamber E, a cooling tower is required like the conventional water-cooled stoker device described at the beginning. It is possible to simplify equipment and reduce equipment costs.
In addition, in the water-cooled stoker device A of the waste incinerator D, since the cooling tower can be reduced, the chemical injection device and the chemical become unnecessary, and the equipment cost can be further reduced. Costs can be reduced.
Furthermore, in the water-cooled stoker device A of the waste incinerator D, since well water or rain water is used as cooling water, compared with a conventional cooling stoker device using clean water as cold water Wo. Cost reduction can be achieved.

  FIG. 2 shows a schematic system diagram of a water-cooled stoker device A of a waste incinerator D according to the second embodiment of the present invention, and the water-cooled stoker device A of the waste incinerator D has a grate cooling water passage. A water-cooled stoker B, which is a combination of the movable grate 1 and the fixed grate 2 formed in a stepped or inclined manner, and a grate cooling water circulation that cools the water-cooled stoker B while circulating the grate cooling water W. The grate cooling water circulation / cooling mechanism C includes a heat utilization facility 27 and a second indirect heat exchanger 28, and includes the heat utilization facility 27 and the grate cooling section C1. The grate cooling water system is thermally connected via a second indirect heat exchanger 28 provided between the indirect heat exchanger 4 and the drain side header 17.

That is, the water-cooled stoker device A of the waste incinerator D passes the grate cooling water W before entering the indirect heat exchanger 4 through the second indirect heat exchanger 28, where the cooling water from the heat utilization equipment 27 is passed. Alternatively, the cooling water is indirectly cooled and then guided to the indirect heat exchanger 4, and the cooling water, the cooling air, the heat medium oil, or the low boiling point medium heated by the second indirect heat exchanger 28 is used as the heat utilization equipment 27. This is used as a heat source of the heat utilization equipment 27 here.
Further, as the heat utilization equipment 27, equipment associated with the waste incinerator D (for example, an economizer that heats boiler feed water, an air preheater that preheats combustion air to the waste incinerator D, etc.) or a waste incinerator D Equipment that does not accompany the snow (for example, a snow melting machine) is used.

  In the water-cooled stoker device A of the waste incinerator D, facilities and equipment other than the heat utilization equipment 27 and the second indirect heat exchanger 28 (water-cooled stoker B, grate cooling water circulation / cooling mechanism C, The grate cooling unit C1, the grate cooling water cooling unit C2, the indirect heat exchanger 4, the exhaust gas cooling chamber E, the water injection supply device F, etc.) are the same as the water-cooled stoker device A of the waste incinerator D shown in FIG. The same parts and members as those of the water-cooled stoker apparatus A of the waste incinerator D shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The water-cooled stoker device A of the waste incinerator D according to the second embodiment described above can achieve the same operational effects as the water-cooled stoker device A of the waste incinerator D shown in FIG.
In addition, the water-cooled stoker device A of the waste incinerator D according to the second embodiment uses the grate cooling water W before entering the indirect heat exchanger 4 through the second indirect heat exchanger 28 and uses the heat here. Since the cooling is performed by the cooling water, the cooling air, the heat medium oil, or the low boiling point medium from the facility 27, the heat energy can be effectively used.

FIG. 3 shows a schematic system diagram of a water-cooled stoker device A of a waste incinerator D according to the third embodiment of the present invention, and the water-cooled stoker device A of the waste incinerator D has a grate cooling water passage. A water-cooled stoker B, which is a combination of the movable grate 1 and the fixed grate 2 formed in a stepped or inclined manner, and a grate cooling water circulation that cools the water-cooled stoker B while circulating the grate cooling water W. The cooling mechanism C is configured to improve the grate cooling water cooling unit C2 of the grate cooling water circulation / cooling mechanism C, and supply of the cold water Wo to the cold water tank 22 of the grate cooling water cooling unit C2 is rainwater. It is used only when it can only be used.
In addition, as an example when only the rainwater can be used for the supply to the cold water tank 22, for example, the precipitation in the waste treatment facility cannot be discharged and needs to be treated in the facility. In some cases, it cannot be processed.

  That is, the grate cooling water cooling unit C2 of the grate cooling water circulation / cooling mechanism C includes a chilled water tank 22 for storing the chilled water Wo, a water supply pump 23 for the chilled water Wo, and a chilled water side heat exchange element of the indirect heat exchanger 4. 4b, a chilled water amount adjusting valve 24 provided on the inlet side of the chilled water side heat exchange element 4b, a flow rate controller 29 for controlling the chilled water amount adjusting valve 24 according to the amount of water injected into the exhaust gas cooling chamber E, and a chilled water side heat A three-way valve 30 that is provided on the outlet side of the exchange element 4b and controls the flow of the cold water Wo to the indirect heat exchanger 4, and a three-way valve 30 based on the detected temperature of the grate cooling water W on the outlet side of the indirect heat exchanger 4. The amount of cold water Wo according to the amount of water injected into the exhaust gas cooling chamber E by controlling the cold water amount adjusting valve 24 by the flow rate controller 29 according to the flow rate from the flow meter 7. Secure the three-way valve 30 Based on the detected temperature of the grate cooling water W on the outlet side of the heat exchanger 4 (the detected temperature from the temperature detector 25a), the temperature controller 25 controls the flow control of the cold water Wo to the indirect heat exchanger 4. It is what I do.

In this embodiment, the three-way valve 30 is provided on the outlet side of the cold water side heat exchange element 4b. However, in another embodiment, the three way valve 30 may be provided on the inlet side of the cold water side heat exchange element 4b. .
When the three-way valve 30 is provided on the outlet side of the cold water side heat exchange element 4b, the three-way valve 30 uses a mixed three-way valve 30 that can mix and flow fluid from two pipes to one pipe, Further, when the three-way valve 30 is provided on the inlet side of the cold water side heat exchange element 4b, the three-way valve 30 is a split three-way valve that can distribute and flow fluid from one pipe to two pipes at a predetermined ratio. 30 is used.

  In the water-cooled stoker device A of the waste incinerator D, equipment and equipment other than the three-way valve 30 and the flow rate controller 29 (water-cooled stoker B, grate cooling water circulation / cooling mechanism C, grate cooling unit C1, The grate cooling water cooling section C2, the indirect heat exchanger 4, the exhaust gas cooling chamber E, the water injection supply device F, etc.) are configured in the same structure as the water-cooled stoker device A of the waste incinerator D shown in FIG. The same parts and members as those of the water-cooled stoker device A of the waste incinerator D shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The water-cooled stoker device A of the waste incinerator D according to the third embodiment described above can also exhibit the same operational effects as the water-cooled stoker device A of the waste incinerator D shown in FIG.

  In the water-cooled stalker apparatus A of the refuse incinerator D according to the third embodiment described above, the heat utilization equipment 27 and the second indirect heat are added to the grate cooling water circulation / cooling mechanism C as shown by a one-dot chain line in FIG. An exchanger 28 is added, and a second indirect heat exchanger 28 in which the heat utilization equipment 27 and the grate cooling water system of the grate cooling unit C1 are provided between the indirect heat exchanger 4 and the drain side header 17 is provided. It may be configured to be thermally connected through the vias.

  A is a water-cooled stoker device, B is a water-cooled stoker, C is a grate cooling water circulation / cooling mechanism, C1 is a grate cooling unit, C2 is a grate cooling water cooling unit, D is a waste incinerator, and E is an exhaust gas cooling chamber , F is a water jet supply device, W is a grate cooling water, Wo is cold water, 1 movable grate, 2 is a fixed grate, 3 is a water-cooled grate body, 4 is an indirect heat exchanger, 4a is a grate cooling Water side heat exchange element, 4b is a cold water side heat exchange element, 5 is a water injection tank, 6 is a water injection pump, 7 is a flow meter, 8 is a water injection control valve, 9 is a water injection nozzle, and 10 is an exhaust gas temperature detector. , 11 is a temperature controller, 12 is piping, 13 is a grate cooling water tank, 14 is a circulation pump, 16 is a water supply side header, 17 is a drainage side header, 21 is piping, 22 is a cold water tank, 23 is a water pump, 24 is a cold water amount control valve, 25 is a temperature controller, and 25a is a temperature detector. Vessel, 26 pipe, 26a the branch pipe, 27 heat utilization equipment, second indirect heat exchanger 28, 29 flow controller, 30 is a three-way valve.

Claims (6)

  A water-cooled stoker that is a combination of a movable grate and a fixed grate each formed with a grate cooling water passage, and a grate cooling that cools the grate cooling water while circulating the grate cooling water to the water-cooled stoker. In a water-cooled stoker device for a waste incinerator comprising a water circulation / cooling mechanism, the grate cooling water circulation / cooling mechanism includes a grate cooling unit that circulates and distributes grate cooling water and a grate of a grate cooling unit. A grate cooling water cooling unit that cools the cooling water with cold water is thermally connected to the grate cooling water cooling unit via an indirect heat exchanger, and the grate cooling water cooling unit is installed in the exhaust gas discharge path of the waste incinerator. The grate cooling unit is configured to supply water to a water injection supply device that injects water into the exhaust gas cooling chamber, and the grate cooling unit includes a grate cooling water tank that stores grate cooling water, a grate cooling water circulation pump, and a grate Cooling water for each Water supply side headers that supply the grate cooling water passages of the dynamic grate and fixed grate, drain side headers that drain the grate cooling water from each grate cooling water passage, and grate cooling water from the drain side header The grate cooling water side heat exchange element of the indirect heat exchanger to be cooled, and the grate cooling water cooling section includes a cold water tank for storing cold water, a water feed pump for cold water, and cold water for the indirect heat exchanger. The temperature at which the chilled water amount adjusting valve is controlled by the detected temperature of the grate cooling water at the outlet side of the indirect heat exchanger, the chilled water amount adjusting valve provided on the inlet side or outlet side of the chilled water side heat exchanging element, and the outlet side of the indirect heat exchanger A water-cooled stoker device for a waste incinerator characterized by comprising a controller.   The grate cooling water circulation / cooling mechanism includes a heat utilization facility and a second indirect heat exchanger, and the heat utilization facility and the grate cooling water system of the grate cooling section are connected to the indirect heat exchanger, the drain side header, The water-cooled stoker device for a refuse incinerator according to claim 1, wherein the water-cooled stoker device is thermally connected via a second indirect heat exchanger provided between the two.   A water-cooled stoker that is a combination of a movable grate and a fixed grate each formed with a grate cooling water passage, and a grate cooling that cools the grate cooling water while circulating the grate cooling water to the water-cooled stoker. In a water-cooled stoker device for a waste incinerator comprising a water circulation / cooling mechanism, the grate cooling water circulation / cooling mechanism includes a grate cooling unit that circulates and distributes grate cooling water and a grate of a grate cooling unit. A grate cooling water cooling unit that cools the cooling water with cold water is thermally connected to the grate cooling water cooling unit via an indirect heat exchanger, and the grate cooling water cooling unit is installed in the exhaust gas discharge path of the waste incinerator. The grate cooling unit is configured to supply water to a water injection supply device that injects water into the exhaust gas cooling chamber, and the grate cooling unit includes a grate cooling water tank that stores grate cooling water, a grate cooling water circulation pump, and a grate Cooling water for each Water supply side headers that supply the grate cooling water passages of the dynamic grate and fixed grate, drain side headers that drain the grate cooling water from each grate cooling water passage, and grate cooling water from the drain side header The grate cooling water side heat exchange element of the indirect heat exchanger to be cooled, and the grate cooling water cooling section includes a cold water tank for storing cold water, a water feed pump for cold water, and cold water for the indirect heat exchanger. Side heat exchange element, chilled water amount adjustment valve provided on the inlet side of the chilled water side heat exchange element, a flow rate controller for controlling the chilled water amount adjustment valve according to the amount of water injected into the exhaust gas cooling chamber, and the chilled water side heat exchange element A three-way valve that controls the flow of cold water to the indirect heat exchanger and a temperature controller that controls the three-way valve based on the detected temperature of grate cooling water on the outlet side of the indirect heat exchanger Characterized by comprising Water-cooled stoker device only incinerator.   2. A water-cooled stoker device for a waste incinerator according to claim 1, wherein the grate cooling water in the grate cooling water tank is well water or clean water, and the well water or clean water is pumped by a grate cooling water circulation pump. After passing through a water-cooled stoker, it is cooled by an indirect heat exchanger and returned to the grate cooling water tank, and the cold water in the cooling tank is made into well water or rain water, and the well water or rain water is indirectly heated by a cold water pump. Waste incineration characterized by being fed to the exchanger and used here for cooling the grate cooling water, then supplied to the water jet supply device of the exhaust gas cooling chamber and used as the jet water of the exhaust gas cooling chamber Operation method of water-cooled stoker equipment for furnace.   5. The grate cooling water before entering the indirect heat exchanger is passed through the second indirect heat exchanger, where it is cooled by cooling water or cooling air from the heat utilization equipment. To operate a water-cooled stoker device in a waste incinerator.   4. A water-cooled stoker device for a refuse incinerator according to claim 3, wherein the grate cooling water in the grate cooling water tank is well water or clean water, and the well water or clean water is pumped by a grate cooling water circulation pump. After passing through a water-cooled stoker, it is cooled by an indirect heat exchanger and returned to the grate cooling water tank, and the cold water in the cooling tank is made rainwater, and this rainwater is pumped to the indirect heat exchanger by a water pump. After using the grate cooling water here, the rainwater is supplied to the water injection supply device of the exhaust gas cooling chamber and used as the injection water of the exhaust gas cooling chamber, and the water injection flow rate to the exhaust gas cooling chamber is further increased. Accordingly, the amount of rainwater is adjusted by controlling the cold water amount control valve, and the rainwater to the indirect heat exchanger is controlled by controlling the three-way valve based on the detected temperature of the grate cooling water on the outlet side of the indirect heat exchanger. Garbage characterized by distribution control How the operation of the water-cooled stoker device 却炉.

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