Water-cooled cooling device for stoker equipment and design method for water-cooled cooling device for stoker equipment

Abstract

To provide a water-cooling type cooling device of a stoker device which does not impair reliability while avoiding the employment of a first-class pressure vessel.SOLUTION: A water-cooling type cooling device 1 of a stoker device comprises a stoker cooling water supply path 20 connected with cooling water flow passages formed at stokers via a connecting pipe, an open-type water tank 3 for collecting cooling water from the stoker cooling water supply path, a pump 6 for making the cooling water circulate and supplying it therebetween, and a cooling mechanism 4 for cooling the circulated cooling water. An installation height H of the open-type water tank 3 and a volume Vs of the cooling water flow passage of the stoker are set so as to satisfy a relational expression (Ph+Pr)×Vs≤0.001 with respect to head pressure Ph[MPa] reaching the open-type water tank 3 which is arranged above the stoker cooling water supply flow passage, a pressure loss Pr[MPa] at the stoker cooling water supply path when making a prescribed flow rate of cooling water flow to the stoker cooling water supply path, and a volume Vs[m3] of the cooling water flow passage of each of the stokers.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water-cooled cooling device for a stoker system and a method for designing a water-cooled cooling device for a stoker system. [Background technology]

[0002] Conventionally, as a cooling device for a stoker device of a refuse incinerator, for example, an air-cooled cooling device using combustion air supplied from a wind box disposed below the stoker device has been widely used.

[0003] However, in order to prevent environmental pollution, waste incinerators are adopting low-air-ratio combustion methods and oxygen-enriched combustion methods, which tend to increase the combustion temperature. Furthermore, municipal waste and other waste are becoming increasingly high-calorie. This has led to the problem of the temperature of the grates that make up the stoker device rising in parts, leading to burnout.

[0004] Patent Document 1 discloses a waste incinerator that employs a water-cooled stoker device instead of an air-cooled stoker device. The water-cooled stoker device is equipped with a pressure pump, an expansion vessel, a compressor, a level gauge, a recooler, a temperature detector, a ventilator, a pressure control valve, a pressure detector, a flow detector, a flow control valve, a grate cooling water supply pipe, a grate cooling water drainage pipe, a pressurized cooling water supply port, etc.

[0005] The air pressure in the expansion vessel is adjusted by controlling the operation of the compressor to maintain a predetermined pressurized state, and when the pressure in the system exceeds a set value, the air pressure in the expansion vessel is blown out. For example, the boiling point is raised to about 140°C, and the cooling water outlet temperature is set to 90°C, preventing the grate cooling water from vaporizing in the system. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 10-504890 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when the water-cooled stoker device disclosed in Patent Document 1 is adopted, the grate is classified as a Class 1 pressure vessel, which corresponds to the regulations for a vessel that holds a liquid inside at a temperature above its boiling point at atmospheric pressure. In accordance with the pressure vessel safety regulations set forth in the Labor Standards Act, inspections by the Labor Bureau are mandatory at the manufacturing and installation stages, and after use begins, performance inspections by an inspection agency are required periodically, which requires complicated work and raises the issue of various management costs.

[0008] Therefore, in order to avoid the application of a Class 1 pressure vessel, it is conceivable to install a dissolving plug on a grate or the like that will melt when the temperature of the liquid inside the vessel rises and allow steam to escape. However, using a dissolving plug that is not sufficiently reliable could actually undermine the reliability of the water-cooled stoker device.

[0009] In view of the above-mentioned conventional problems, the object of the present invention is to provide a water-cooled cooling device for a stoker system and a design method for a water-cooled cooling device for a stoker system that avoids the application of a first-class pressure vessel while not compromising reliability. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, a first characteristic configuration of the water-cooled cooling device for a stoker device according to the present invention is a water-cooled cooling device for a stoker device in which a plurality of water-cooled grates, each having a cooling water flow path formed therein, are arranged in parallel, and the water-cooled cooling device comprises: a grate cooling water supply path in which a water inlet and a water outlet of each cooling water flow path are connected by a connecting pipe between adjacent grates; an open-type water tank disposed above the grate cooling water supply path and for recovering cooling water from the grate cooling water supply path; a pump that circulates and supplies the cooling water recovered in the open-type water tank to the grate cooling water supply path; and a cooling mechanism that cools the cooling water recovered in the open-type water tank, and the water-cooled cooling device is configured to calculate a head pressure Ph [MPa] from the grate cooling water supply path to the open-type water tank, a pressure loss Pr [MPa] in the grate cooling water supply path when a predetermined flow rate of cooling water is flowed through the grate cooling water supply path, a volume Vs [m 3 The installation height H based on the inlet side of the grate cooling water supply path of the open-type water tank and the volume Vs of the cooling water flow path of the grate are set so as to satisfy the relationship (Ph+Pr)×Vs≦0.001.

[0011] By setting the installation height H of the open-type water tank relative to the inlet side of the grate cooling water supply path and the volume Vs of the grate cooling water flow path so that the above relationship is satisfied, it is possible to avoid the grate, which is a component of the stoker system's water-cooled cooling device, being certified as a Class 1 pressure vessel without using unreliable parts such as dissolvable plugs, thereby reducing management costs while ensuring reliability.In other words, by applying a head pressure equivalent to the installation height H of the open-type water tank to the grate, there is a large margin before the cooling water boils, allowing the waste incinerator to operate safely.

[0012] The second characteristic feature of the present invention is that, in addition to the first characteristic feature described above, a pressure regulating valve is provided between the pump and the grate cooling water supply path.

[0013] By operating the pressure regulating valve, the pressure loss due to the pump is reduced, thereby preventing excessive pressure from being applied to the grate.

[0014] The third characteristic configuration is that, in addition to the second characteristic configuration described above, the device is equipped with a control unit that adjusts the opening degree of the pressure regulating valve so as to satisfy the relational expression (Ph+Pr)×Vs≦0.001.

[0015] Even if the pressure loss Pr [MPa] in the grate cooling water supply path fluctuates, the control unit can adjust the opening of the pressure regulating valve, allowing the incinerator to be operated appropriately and safely.

[0016] The fourth characteristic configuration of the present invention is, in addition to any one of the first to third characteristic configurations described above, further provided with a plurality of water-cooled side walls having cooling water flow paths formed therein and pressing the parallel-arranged fire grates from the sides, and a side wall cooling water supply path connecting the water inlet and the water outlet of each cooling water flow path between adjacent side walls with a connecting pipe, wherein cooling water is recovered from the side wall cooling water supply path disposed below the open-type water tank into the open-type water tank, and the cooling water recovered in the open-type water tank is circulated and supplied to the side wall cooling water supply path by the pump, and the head pressure Ph [MPa] from the side wall cooling water supply path to the open-type water tank, the pressure loss Pr' [MPa] in the side wall cooling water supply path when a predetermined flow rate of cooling water is flowed through the side wall cooling water supply path, and the volume Vs' [m 3 ], the installation height H based on the inlet side of the side wall cooling water supply path of the open-type water tank and the volume Vs' of the cooling water flow path of the side wall are set so as to satisfy the relational expression (Ph+Pr')×Vs'≦0.001.

[0017] By setting the installation height H of the open-type water tank relative to the inlet side of the side wall cooling water supply path and the volume Vs' of the side wall cooling water flow path so that the above relationship is satisfied, the cooling wall, which is a component of the stoker system's water-cooled cooling device, can be prevented from being certified as a Class 1 pressure vessel without using unreliable parts such as soluble plugs, thereby reducing management costs while ensuring reliability.In other words, by applying a head pressure equivalent to the installation height H of the open-type water tank to the side wall, there is a larger margin before the cooling water boils, allowing the waste incinerator to operate safely.

[0018] The first characteristic configuration of the design method of the water-cooled cooling device for a stoker apparatus according to the present invention is a design method of the water-cooled cooling device for a stoker apparatus in which a plurality of water-cooled grates each having a cooling water flow path formed therein are arranged in parallel, and the design method includes: a grate cooling water supply path in which the water inlet and the water outlet of each cooling water flow path are connected by a connecting pipe between adjacent grates; open type aquarium than downward Distributed in R The cooling water supply system comprises an open-type water tank that recovers cooling water from the grate cooling water supply path, a pump that circulates and supplies the cooling water recovered in the open-type water tank to the grate cooling water supply path, and a cooling mechanism that cools the cooling water recovered in the open-type water tank, and is configured to calculate a head pressure Ph [MPa] from the grate cooling water supply path to the open-type water tank, a pressure loss Pr [MPa] in the grate cooling water supply path when a predetermined flow rate of cooling water is flowed through the grate cooling water supply path, and a volume Vs [m 3 The point is to set the installation height H based on the inlet side of the grate cooling water supply path of the open-type water tank and the volume Vs of the cooling water flow path of the grate so as to satisfy the relationship (Ph+Pr)×Vs≦0.001.

[0019] The second characteristic configuration is, in addition to the first characteristic configuration described above, further comprising: a plurality of water-cooled side walls having cooling water flow paths formed therein and pressing the parallel-arranged fire grates from the sides; and a side wall cooling water supply path connecting the water inlet and the water outlet of each cooling water flow path between adjacent side walls with a connecting pipe; open type aquarium than downward Distributed in R The cooling water is recovered from the side wall cooling water supply path into the open-type water tank, and the cooling water recovered in the open-type water tank is circulated and supplied to the side wall cooling water supply path by the pump. The head pressure Ph [MPa] from the side wall cooling water supply path to the open-type water tank, the pressure loss Pr' [MPa] in the side wall cooling water supply path when a predetermined flow rate of cooling water is flowed through the side wall cooling water supply path, and the volume Vs' [m 3 ], the relation (Ph+Pr´)×Vs´≦ 0.001 The open-type water tank is side wallThe point is to set the installation height H based on the inlet side of the cooling water supply path and the volume Vs' of the cooling water flow path of the side wall.

[0020] The third characteristic configuration is, in addition to the second characteristic configuration described above, a predetermined temperature at which the cooling water in the cooling water flow path provided in the grate and / or the side wall rises above 100°C during the period when the incinerator equipped with the water-cooled cooling device is shut down in a state where the pump is stopped in the event of a power outage, or during the period until the pump is switched to a backup pump in the event of a failure of the pump, and the steam pressure Ps at the predetermined temperature is calculated based on (Ph'+Ps)×Vs'≦ 0.001 The point is to determine the head pressure Ph'' [MPa] and the volume Vs'' of the cooling water flow path provided in the grate and / or the side wall so as to satisfy the above. [Effects of the Invention]

[0021] As described above, according to the present invention, it is possible to provide a water-cooled cooling device for a stoker system and a design method for a water-cooled cooling device that avoids the application of a first-class pressure vessel while not compromising reliability. [Brief explanation of the drawings]

[0022] [Figure 1] Illustration of the water-cooled cooling device for the stoker device [Figure 2] (a) is a bottom view of the grate at the left end facing the direction of transport of the incineration material, (b) is a bottom view of the grate in the center, (c) is a bottom view of the grate at the right end, (d) is an AA cross-sectional view of (a), (b), and (c), and (e) is a BB cross-sectional view of (a) and (c). [Figure 3] (a) is an explanatory diagram of the connecting pipes that connect the cooling channels of the grates arranged in parallel across the furnace width, and (b) is an explanatory diagram of the manifolds that supply cooling water to the cooling channels of each grate and the installation positions of the pressure sensors. [Figure 4] (a) is an explanatory diagram of the main part of the water-cooled wall, and (b) is an explanatory diagram of the main part of the water-cooled wall showing the AA cross section of (a). [Figure 5](a) is an explanatory diagram of FIG. 4(a) viewed from the BB direction, (b) is a cross-sectional view of FIG. 4(a) viewed from the DD direction, and (c) is an explanatory diagram of FIG. 4(a) viewed from the CC direction. [Figure 6] A partially cutaway perspective view showing the combustion chamber of a waste incinerator [Figure 7] 10A and 10B are explanatory views of a water-cooled cooling device for a stoker device according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, a water-cooled cooling device for a stoker device and a design method for the water-cooled cooling device for a stoker device according to the present invention will be described with reference to the drawings.

[0024] FIG. 6 shows a schematic structure of a furnace chamber of a general stoker-type incinerator A to which the present invention can be applied. The furnace chamber is covered with a fire-resistant wall W and is equipped with a hearth B consisting of a stoker mechanism with multiple fire grates 2 arranged in it. Combustion air is supplied from a forced draft fan to a wind box installed below the hearth B through the fire grates 2 to the waste to be incinerated on the hearth B.

[0025] Each grate 2 is made up of a fixed grate group 2F whose base end is swingably supported by a cylindrical support rod C1 hung horizontally on a fixed frame C, and a movable grate group 2M whose base end is swingably supported by a cylindrical support rod D1 hung horizontally on a movable frame D that moves back and forth in the direction of waste transport relative to the fixed frame C. The multiple grate groups 2F, 2M arranged side by side in the width direction are sandwiched between a pair of side walls SW located on both sides of the furnace chamber, and the side walls SW are pressed from the outside toward the center by springs.

[0026] The movable frame D is reciprocated by the hydraulic mechanism E, causing the movable grate group 2M and the fixed grate group 2F to move relative to each other, and the materials to be incinerated on the hearth B are stirred and transported downstream.

[0027] A combustion burner is installed on the ceiling of the furnace chamber and is used to raise the temperature inside the furnace when starting up the furnace. When the calorific value of the waste is low, the heat from the combustion burner dries and ignites the material to be incinerated on hearth B, and the material is burned while being stirred and transported by the grate group.

[0028] The central hearth B forms the main combustion zone where gasification combustion mainly takes place, with separate hearths provided on the upstream and downstream sides. The upstream hearth Bu forms a drying zone where materials to be incinerated are mainly dried, and the downstream hearth Bd forms a post-combustion zone where solid materials after gasification combustion are incinerated. Note that the upstream hearth Bu and the central hearth B may sometimes be integrated into one unit.

[0029] The above-mentioned fire grate 2 and side wall SW are provided with a cooling mechanism that uses water as a cooling medium. 2(a) to 2(e) show the cooling mechanism provided in the grate 2. Each grate 2 is made of heat-resistant cast steel, and inside the casting, two cooling water flow paths 2A are formed in parallel from the base end to the tip along the longitudinal direction, which is the transport direction of the materials to be incinerated. The two cooling water flow paths 2A are bent downward at the tip end, and are connected to each other by a communication path 2B formed at the tip end.

[0030] On the rear surface of the grate 2, fittings are provided at the base end of each cooling water flow path 2A, serving as a cooling water inlet 2Pi and a drain outlet 2Po. Fig. 2(a) shows the grate 2L at the left end as viewed in the direction of transport of the materials to be incinerated, Fig. 2(c) shows the grate 2R at the right end as viewed in the direction of transport of the materials to be incinerated, and Fig. 2(b) shows the intermediate grate 2C. The intermediate grate 2C is provided with fittings 2D bent in a dogleg shape toward the tip as the water inlet 2Pi and the drain outlet 2Po (see Fig. 2(d)). The left-end grate 2L is provided with fittings 2E extending downward as the water inlet 2Pi, and the right-end grate 2R is provided with fittings 2F extending downward as the drain outlet 2Po (see Fig. 2(e)).

[0031] As shown in Figure 3(a), seven grates 2 are arranged side by side in the furnace width direction, and connecting pipes 2T are fastened and fixed by screwing between the water inlet 2Pi and the drain outlet 2Po of adjacent grates 2. Cooling water supplied from a water supply pipe connected to the water inlet 2Pi of the left-end grate 2L passes through a cooling water flow path 2A, and then is supplied from the drain outlet 2Po to the water inlet 2Pi of the adjacent grate 2 via the connecting pipe 2T, and is then drained from a drain pipe connected to the drain outlet 2Po of the right-end grate 2R.

[0032] As shown in Figure 3(b), the connection fitting 2E provided on the grate 2L at the left end is connected to distribution pipes Mi1, Mi2, Mi3, ... branching off from the distribution manifold Mi, and cooling water is branched and supplied, and a pressure sensor 8 is attached to the distribution manifold Mi. Similarly, the connection fittings 2F provided on the grate 2R at the right end are each connected to the drain manifold Mo via a drain pipe.

[0033] 4(a), (b) and 5(a), (b), (c) show the cooling mechanism provided on the side wall SW, which functions as a cooling wall. A fire-resistant wall W is arranged on the outside of the side wall SW, and a spring SP, which constitutes a pressing mechanism incorporated in the fire-resistant wall W, presses the fire grate 2 toward the center of the furnace width via the side wall SW.

[0034] The side wall SW is made up of multiple wear-resistant metal plates and is arranged along the arrangement direction of the fire grate 2. A plurality of water-cooling jackets S, each having a cooling water flow path S1 formed therein, are arranged on the rear surface of the side wall SW. The connectors provided at the ends of the cooling water flow paths S1 formed in the water-cooling jackets S are connected to each other by connecting pipes ST, and the cooling water flow paths S1 are connected in series.

[0035] 4(a) indicates the piping on the cooling water inlet side of the side wall SW, and the symbol SPo indicates the piping on the cooling water outlet side. A similar cooling mechanism is also provided on the side wall SW arranged opposite to the grate 2. Note that the side wall SW may be made of a single wall, with multiple divided water-cooling jackets S arranged on the back surface thereof.

[0036] In this embodiment, the water-cooled jacket S of the side wall SW, which serves as a water-cooled wall, is divided by the piping ST, and the volume Vs' [m 3 ] is defined as the volume of each water-cooled jacket S, excluding the volume of the water supply pipe SPi, the connecting pipe ST, and the water outlet pipe SPo.

[0037] Figure 1(a) shows the overall configuration of a water-cooled cooling device 1 for a stoker device. The water-cooled cooling device 1 for a stoker device has multiple water-cooled grates 2 arranged in parallel, each having a cooling water flow path 2A formed therein.

[0038] The water-cooled cooling device 1 includes a grate cooling water supply path 20 that connects the water inlet 2Pi and the drain outlet 2Po of each cooling water flow path 2A between adjacent grates 2 with a connecting pipe 2T, a water distribution manifold Mi that distributes cooling water to the grate cooling water supply path 20, a drain manifold Mo that drains cooling water from the grate cooling water supply path 20, an open-type water tank 3 that recovers cooling water from the grate cooling water supply path 20, a pump 6 that circulates the cooling water recovered in the open-type water tank 3 to the grate cooling water supply path 20, a cooling mechanism 4 such as a cooling tower that cools the cooling water recovered in the open-type water tank 3, and a cooling water tank 5 that recovers the cooling water.

[0039] The open-type water tank 3 is disposed above the grate cooling water supply path 20, in this example above the water distribution manifold Mi. By providing an overflow pipe below the return pipe connected to the open-type water tank 3, the water level in the open-type water tank 3 is prevented from being above the connection position of the return pipe.

[0040] The head pressure Ph [MPa] from the grate cooling water supply path 20 (in this example, the water distribution manifold Mi) to the open water tank 3, the pressure loss Pr [MPa] of the grate cooling water supply path 20, the volume Vs [m 3 ], the installation height H of the open-type water tank 3 and the volume Vs of the cooling water flow path 2A of the grate 2 are set so as to satisfy the following relational expression. (Ph+Pr)×Vs≦0.001

[0041] By setting the installation height H of the open-type water tank 3, based on the inlet side of the grate cooling water supply path, and the volume Vs of the cooling water flow path 2A of the grate 2, so as to satisfy the above-mentioned relational expression, it is possible to avoid the grate 2, which is a component of the water-cooled cooling device 1 of the stoker device, being certified as a Class 1 pressure vessel without using unreliable parts such as fusible plugs, and it is possible to reduce management costs while ensuring reliability.In other words, by applying a head pressure equivalent to the installation height H of the open-type water tank to the grate, there is a large margin before the cooling water boils, allowing the waste incinerator to operate safely.

[0042] A pressure regulating valve 7 is provided between the pump 6 and the grate cooling water supply path 20, and is configured so that pressure loss caused by the pump 6 can be reduced by operating the pressure regulating valve 7. As a result, excessive pressure on the grate 2 can be avoided.

[0043] Furthermore, it is preferable to provide a control unit that adjusts the opening of the pressure regulating valve 7 so as to satisfy the above-mentioned relational expression, and even if the pressure loss Pr [MPa] in the grate cooling water supply path 20 fluctuates, the control unit can adjust the opening of the pressure regulating valve 7, thereby enabling the incinerator to be operated appropriately and safely. The type of the control unit is not particularly limited, and it can be configured as a control circuit using a PLC circuit or a microcomputer, as long as it can adjust the opening of the pressure regulating valve 7 based on the pressure value.

[0044] The above-mentioned water-cooled cooling device 1 may further include a plurality of water-cooled side walls SW having cooling water flow paths S1 formed therein and pressing the grate 2 from the ends thereof, and a side wall cooling water supply path 30 connecting the water inlet and drain outlet of each cooling water flow path S1 between adjacent side walls SW with a connecting pipe ST, and configured to recover cooling water from the side wall cooling water supply path 30 to the open-type water tank 3, and to circulate and supply the cooling water recovered in the open-type water tank 3 to the side wall cooling water supply path 30 by a pump 6.

[0045] In this case, the open-type water tank 3 must also be located above the side wall cooling water supply path 30. The head pressure Ph [MPa] from the side wall cooling water supply path 30 to the open-type water tank 3, the pressure loss Pr' [MPa] of the side wall cooling water supply path 30, and the volume Vs' [m 3 ], the installation height H of the open-type water tank 3 and the volume Vs' of the cooling water flow path S1 of the side wall SW may be set so as to satisfy the following relational expression. (Ph+Pr´)×Vs´≦0.001

[0046] By setting the installation height H of the open-type water tank 3 and the volume Vs' of the cooling water flow path in the side wall SW so as to satisfy the above-mentioned relational expression, the cooling wall SW, which is a component of the water-cooled cooling device of the stoker device, can be prevented from being certified as a Class 1 pressure vessel without using unreliable parts such as soluble plugs, thereby reducing management costs while ensuring reliability.In other words, by applying a head pressure equivalent to the installation height H of the open-type water tank 3 to the side wall, there is a large margin before the cooling water boils, allowing the waste incinerator to operate safely.

[0047] In addition, when cooling water is supplied to both the grate cooling water supply path 20 and the side wall cooling water supply path 30, the installation height H of the open-type water tank 3, the volume Vs of the cooling water flow path 2A of the grate 2, and the volume Vs' of the cooling water flow path S1 of the side wall SW can be set so that the respective relationship equations described above are satisfied.

[0048] 7(a) and (b) show an embodiment in which a water-water heat exchanger 4' is used instead of the cooling tower 4 shown in Fig. 1 to cool the cooling water recovered in the open-type water tank 3. According to this embodiment, the cooling water tank 5 is not necessary.

[0049] That is, the design method of the water-cooled cooling device according to the present invention is a design method of the water-cooled cooling device of a stoker device in which a plurality of water-cooled grates, each having a cooling water flow path formed therein, are arranged in parallel, and the design method comprises a grate cooling water supply path in which the water inlet and the water outlet of each cooling water flow path are connected by a connecting pipe between adjacent grates, an open water tank for recovering cooling water from the grate cooling water supply path, a pump for circulating and supplying the cooling water recovered in the open water tank to the grate cooling water supply path, and a cooling mechanism for cooling the cooling water recovered in the open water tank, and the design method is based on the head pressure Ph [MPa] from the grate cooling water supply path to the open water tank, the pressure loss Pr [MPa] of the grate cooling water supply path, the volume Vs [m 3 ], the installation height H of the open water tank and the volume Vs of the cooling water flow path of the grate are set so as to satisfy the relationship (Ph+Pr)×Vs≦0.001.

[0050] The system further comprises a plurality of water-cooled side walls, each having a cooling water flow path formed therein and pressing the grate from its end, and a side wall cooling water supply path in which the water inlet and outlet of each cooling water flow path are connected by a connecting pipe between adjacent side walls. The cooling water is collected from the side wall cooling water supply path to an open water tank, and the cooling water collected in the open water tank is circulated and supplied to the side wall cooling water supply path by a pump. The system is configured so that the head pressure Ph [MPa] from the side wall cooling water supply path to the open water tank, the pressure loss Pr' [MPa] of the side wall cooling water supply path, and the volume Vs' [m 3 ], the relation (Ph+Pr´)×Vs´≦ 0.001 The installation height H of the open-type water tank and the volume Vs' of the cooling water flow path in the side wall are set so as to satisfy the above.

[0051] Furthermore, during the time when an incinerator equipped with a water-cooled cooling device is shut down with the pump P stopped in the event of a power outage, or during the time when the pump P is switched to a backup unit in the event of a breakdown in the pump P, the cooling water in the cooling water flow path provided in the grate 2 and / or side wall SW will rise to a temperature exceeding 100°C. From the steam pressure Ps at the predetermined temperature, (Ph´´+Ps)×Vs´´≦ 0.001By determining the head pressure Ph'" [MPa] and the volume Vs'" of the cooling water flow passage in the grate 2 and / or side wall SW so as to satisfy the above, boiling of the cooling water can be avoided even in the event of an abnormal situation.

[0052] The above-described embodiment is merely an example of the present invention, and the technical scope of the present invention is not limited by the description. Furthermore, it goes without saying that the specific structure, materials, size, installation mode, etc. of each part can be appropriately modified and designed within the scope of the effects of the present invention. [Explanation of symbols]

[0053] 1: Water-cooled cooling device for stoker equipment 2,2L,2C,2R:Grate 2A: Cooling water flow path 2B: Communication path 2Pi: Water inlet 2Po: Drain port 2D, 2E, 2F: Connection fittings 4: Cooling mechanism (cooling tower) 20: Grate cooling water supply path 30: Side wall cooling water supply path A: Stoker type incinerator B: Hearth (combustion zone) Bu: Hearth (drying zone) Bd: Hearth (post-combustion zone) C: Fixed Frame C C1: Support rod D: Movable frame D1: Support rod Mi: Water distribution manifold Mo: Drain manifold SW: Side wall S: Water-cooled jacket S1: Cooling water flow path ST: Connecting pipe

Claims

1. A water-cooled cooling device for a stoker device in which a plurality of water-cooled grates having cooling water flow paths formed therein are arranged in parallel, a grate cooling water supply path connecting the water inlet and the water outlet of each cooling water flow path between adjacent grates with a connecting pipe; an open-type water tank disposed above the grate cooling water supply passage and configured to collect cooling water from the grate cooling water supply passage; a pump that circulates and supplies the cooling water recovered in the open water tank to the grate cooling water supply path; a cooling mechanism that cools the cooling water collected in the open water tank; Equipped with The head pressure Ph [MPa] from the grate cooling water supply path to the open water tank, the pressure loss Pr [MPa] in the grate cooling water supply path when a predetermined flow rate of cooling water is flowed through the grate cooling water supply path, and the volume Vs [m ３ ], the relation (Ph+Pr)×Vs≦0.001 The installation height H based on the inlet side of the grate cooling water supply path of the open water tank and the volume Vs of the cooling water flow path of the grate are set so as to satisfy the above. A water-cooled cooling device for a stoker apparatus.

2. The water-cooled cooling device for a stoker apparatus according to claim 1, further comprising a pressure regulating valve between the pump and the grate cooling water supply path.

3. The above relational expression (Ph+Pr)×Vs≦0.001 The water-cooled cooling device for a stoker apparatus according to claim 2, further comprising a control unit that adjusts the opening of the pressure regulating valve so as to satisfy the above condition.

4. A plurality of water-cooled side walls each having a cooling water flow path formed therein and pressing the parallel-arranged fire grates from the side; a sidewall cooling water supply path connecting the water inlet and the water outlet of each cooling water flow path between adjacent sidewalls with a connecting pipe; Furthermore, The cooling water is collected into the open-type water tank from the side wall cooling water supply path disposed below the open-type water tank, and the cooling water collected in the open-type water tank is circulated and supplied to the side wall cooling water supply path by the pump, The head pressure Ph [MPa] from the side wall cooling water supply path to the open-type water tank, the pressure loss Pr' [MPa] in the side wall cooling water supply path when a predetermined flow rate of cooling water is flowed through the side wall cooling water supply path, and the volume Vs' [m ３ ], the relation (Ph+Pr')×Vs'≦0.001 4. The water-cooled cooling device of any one of claims 1 to 3, wherein the installation height H based on the inlet side of the side wall cooling water supply path of the open water tank and the volume Vs' of the cooling water flow path of the side wall are set so as to satisfy the above.

5. A design method for a water-cooled cooling device for a stoker device in which a plurality of water-cooled grates having cooling water flow paths formed therein are arranged in parallel, a grate cooling water supply path connecting the water inlet and the water outlet of each cooling water flow path between adjacent grates with a connecting pipe; an open-type water tank disposed above the grate cooling water supply passage and configured to collect cooling water from the grate cooling water supply passage; a pump that circulates and supplies the cooling water recovered in the open water tank to the grate cooling water supply path; a cooling mechanism that cools the cooling water collected in the open water tank; Equipped with The head pressure Ph [MPa] from the grate cooling water supply path to the open water tank, the pressure loss Pr [MPa] in the grate cooling water supply path when a predetermined flow rate of cooling water is flowed through the grate cooling water supply path, and the volume Vs [m ３ ], the relation (Ph+Pr)×Vs≦0.001 A design method for a water-cooled cooling device for a stoker device in which the installation height H based on the inlet side of the grate cooling water supply path of the open water tank and the volume Vs of the cooling water flow path of the grate are set so as to satisfy the above.

6. A plurality of water-cooled side walls each having a cooling water flow path formed therein and pressing the parallel-arranged fire grates from the side; a sidewall cooling water supply path connecting the water inlet and the water outlet of each cooling water flow path between adjacent sidewalls with a connecting pipe; Furthermore, cooling water is collected into the open-type water tank from the side wall cooling water supply path disposed below the open-type water tank, and the cooling water collected in the open-type water tank is circulated and supplied to the side wall cooling water supply path by the pump, The head pressure Ph [MPa] from the side wall cooling water supply path to the open-type water tank, the pressure loss Pr' [MPa] in the side wall cooling water supply path when a predetermined flow rate of cooling water is flowed through the side wall cooling water supply path, and the volume Vs' [m ３ ], the relation (Ph+Pr')×Vs'≦0.001 6. A design method for a water-cooled cooling device for a stoker apparatus according to claim 5, wherein an installation height H based on the inlet side of the side wall cooling water supply path of the open water tank and a volume Vs' of the cooling water flow path of the side wall are set so as to satisfy the above.

7. During the time when the incinerator equipped with the water-cooled cooling device is shut down with the pump stopped in the event of a power outage, or during the time when the pump is switched to a backup unit in the event of a failure of the pump, a predetermined temperature is assumed at which the cooling water in the cooling water flow path provided on the grate and / or the side wall rises above 100°C, and the head pressure Ph'' [MPa] and the temperature of the cooling water flow path provided on the grate and / or the side wall are adjusted so that the steam pressure Ps at the predetermined temperature satisfies (Ph'' + Ps) x Vs'' ≦ 0.

001. The method for designing a water-cooled cooling system for a stoker system according to claim 6, wherein the volume Vs' is determined.

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