Heating device for garbage pool of garbage power plant, garbage pool and garbage power plant

Abstract

The utility model provides a kind of for garbage power plant garbage pool heating device, garbage pool and garbage power plant, it is related to garbage power generation technical field, the utility model includes fixed installation in the surface of concrete terrace steam turbine, the input end of steam turbine and steam pipeline intercommunication, the exhaust port of steam turbine is fixedly installed with spent steam waste heat recovery device, spent steam waste heat recovery device is surface type heat exchanger, the utility model waste heat recovery device, so that utilize steam turbine, spent steam waste heat recovery device, flue gas waste heat recovery device and cooling water waste heat recovery device synergistic effect, can simultaneously recover incinerator flue gas, steam turbine spent steam, generator cooling water and other multiple waste heat, avoid energy waste, realize energy saving and cost reduction, meet green environmental protection demand, recycled waste heat can be simultaneously transferred to the floor heating coil in garbage pool by circulating medium, provide sustained stable heat for garbage pool, effectively solve the problem of insufficient fermentation caused by garbage pool temperature too low in winter, ensure garbage fermentation effect, improve subsequent incineration efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste-to-energy technology, and in particular to a heating device for waste pools in waste-to-energy plants, a waste pool, and a waste-to-energy plant. Background Technology

[0002] With the acceleration of urbanization, the amount of urban domestic waste is increasing day by day. Waste-to-energy, as an effective way to reduce, harmlessly treat and recycle waste, has been widely used.

[0003] However, in winter, due to the low ambient temperature, the temperature inside the waste pool of the waste-to-energy plant also decreases. The fermentation process of the waste is severely inhibited in the low-temperature environment, resulting in insufficient fermentation. When the insufficiently fermented waste enters the incinerator, there is a problem of incomplete combustion. This not only reduces the energy conversion efficiency of the waste and causes energy waste, but also produces a large amount of harmful gases (such as dioxins) and unburned residue, increasing the difficulty and cost of subsequent environmental treatment and causing a significant negative impact on the environment. Utility Model Content

[0004] The purpose of this utility model is to solve the problems mentioned above in the background art by proposing a heating device for a waste-to-energy plant waste pit, a waste pit, and a waste-to-energy plant.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a heating device for a waste-to-energy plant waste pit, comprising a concrete floor, a waste pit body on the surface of the concrete floor, a discharge platform on the bottom surface of the waste pit body, a ramp at the inlet of the waste pit body, an incinerator on the surface of the concrete floor, a flue gas duct fixedly installed on the top surface of the incinerator, a chimney fixedly installed on the top surface of the flue gas duct, a steam duct fixedly installed on the side of the incinerator, and a waste heat recovery device on the surface of the concrete floor, the waste heat recovery device comprising a steam turbine fixedly installed on the surface of the concrete floor, the input end of the steam turbine being connected to the steam duct, and a waste steam waste heat recovery device fixedly installed at the exhaust port of the steam turbine, the waste steam waste heat recovery device being a surface heat exchanger.

[0006] Preferably, a generator is fixedly installed on the surface of the concrete floor, the output shaft of the turbine is connected to the input shaft of the generator through a flexible coupling, and a cooling water waste heat recovery device is fixedly installed in the cooling system of the generator. The cooling water waste heat recovery device is a plate heat exchanger, and the cooling water waste heat recovery device is connected in series in the generator cooling water circulation pipe. Generator cooling water and circulation medium are respectively introduced into both sides of the cooling water waste heat recovery device.

[0007] Preferably, a flue gas waste heat recovery device is fixedly installed on the surface of the incinerator. The flue gas waste heat recovery device is connected to the flue gas pipeline through a first connecting pipe, and the flue gas waste heat recovery device is a finned tube heat exchanger.

[0008] Preferably, a circulation pump is provided on the surface of the concrete floor, and an insulation pipe is fixedly installed at the output end of the circulation pump.

[0009] Preferably, a second connecting pipe, made of seamless steel pipe, is provided between the flue gas waste heat recovery unit and the insulation pipe; a third connecting pipe is provided between the cooling water waste heat recovery unit and the insulation pipe; and a fourth connecting pipe is provided between the exhaust steam waste heat recovery unit and the insulation pipe.

[0010] Preferably, the interior of the garbage pit body is equipped with a floor heating coil, which is located directly below the unloading platform, and an auxiliary pipe is fixedly installed on one side of the inner wall surface of the garbage pit body.

[0011] Preferably, the inlet end of the underfloor heating coil is connected to the auxiliary pipe, and the auxiliary pipe and the insulation pipe are connected by a fifth connecting pipe.

[0012] Preferably, the circulating pump is a high-temperature resistant centrifugal pump, and the insulation pipe is made of polyurethane insulation material.

[0013] In addition, this application also provides a waste pit, including the heating device for a waste pit in a waste-to-energy plant as described above.

[0014] In addition, this application also provides a waste-to-energy plant, including the waste pool described above.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] In this invention, by setting up a waste heat recovery device, the synergistic effect of the steam turbine, exhaust steam waste heat recovery unit, flue gas waste heat recovery unit, and cooling water waste heat recovery unit can simultaneously recover various waste heat sources such as incinerator flue gas, steam turbine exhaust steam, and generator cooling water. This avoids energy waste, achieves energy conservation and consumption reduction, and meets the requirements of green environmental protection. At the same time, the recovered waste heat can be transferred to the underfloor heating coils in the waste pit through a circulating medium, providing a continuous and stable heat source for the waste pit. This effectively solves the problem of insufficient fermentation caused by excessively low temperatures in the waste pit during winter, ensures the fermentation effect of the waste, and improves the subsequent incineration efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This utility model Figure 1 Another structural diagram from a different angle;

[0019] Figure 3 This is a partial structural schematic diagram of the waste heat recovery device of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the garbage pit of this utility model.

[0021] Legend: 1. Concrete floor; 2. Waste heat recovery device; 201. Steam turbine; 202. Exhaust steam waste heat recovery unit; 203. Generator; 204. Fourth connecting pipe; 205. Flue gas waste heat recovery unit; 206. First connecting pipe; 207. Insulation pipe; 208. Fifth connecting pipe; 209. Cooling water waste heat recovery unit; 210. Third connecting pipe; 211. Underfloor heating coil; 212. Auxiliary pipe; 213. Circulating pump; 3. Garbage pit body; 4. Slope; 5. Unloading platform; 6. Incinerator; 7. Flue gas duct; 8. Chimney; 9. Steam duct. Detailed Implementation

[0022] Example 1, as Figure 1-4 As shown, a heating device for a waste-to-energy plant waste pit includes a concrete floor 1, a waste pit body 3 on the surface of the concrete floor 1, a discharge platform 5 on the bottom surface of the waste pit body 3, a ramp 4 at the inlet of the waste pit body 3, an incinerator 6 on the surface of the concrete floor 1, a flue gas duct 7 fixedly installed on the top surface of the incinerator 6, a chimney 8 fixedly installed on the top surface of the flue gas duct 7, and a steam pipe 9 fixedly installed on the side of the incinerator 6. The steam pipe 9 has a pressure of 4 MPa and a temperature of 400℃.

[0023] Reference Figure 1-4As shown in this embodiment: a waste heat recovery device 2 is provided on the surface of the concrete floor 1. The waste heat recovery device 2 includes a steam turbine 201 fixedly installed on the surface of the concrete floor 1. The input end of the steam turbine 201 is connected to the steam pipe 9. A waste steam waste heat recovery device 202 is fixedly installed at the exhaust port of the steam turbine 201. The waste steam waste heat recovery device 202 is a surface heat exchanger. A generator 203 is fixedly installed on the surface of the concrete floor 1. The output shaft of the steam turbine 201 is connected to the input shaft of the generator 203 through a flexible coupling. A cooling water waste heat recovery device 209 is fixedly installed in the cooling system of the generator 203. The cooling water waste heat recovery device 209 is a plate heat exchanger. The cooling water waste heat recovery device 209 is connected in series with the cooling water circulation system of the generator 203. In the ring pipeline, cooling water and circulating medium from the generator 203 are respectively introduced to both sides of the cooling water waste heat recovery unit 209. A flue gas waste heat recovery unit 205 is fixedly installed on the surface of the incinerator 6. The flue gas waste heat recovery unit 205 is connected to the flue gas pipeline 7 through a first connecting pipe 206. The flue gas waste heat recovery unit 205 is a finned tube heat exchanger. A circulating pump 213 is installed on the surface of the concrete floor 1. An insulation pipe 207 is fixedly installed at the output end of the circulating pump 213. A second connecting pipe, made of seamless steel pipe, is provided between the flue gas waste heat recovery unit 205 and the insulation pipe 207. A third connecting pipe 210 is provided between the cooling water waste heat recovery unit 209 and the insulation pipe 207. A fourth connecting pipe 204 is provided between the exhaust steam waste heat recovery unit 202 and the insulation pipe 207. The garbage pit body 3 is equipped with a floor heating coil 211 located directly below the unloading platform 5. An auxiliary pipe 212 is fixedly installed on the inner wall of one side of the garbage pit body 3. The inlet end of the floor heating coil 211 is connected to the auxiliary pipe 212. The auxiliary pipe 212 and the insulation pipe 207 are connected by a fifth connecting pipe 208. The circulating pump 213 is a high-temperature resistant centrifugal pump. The insulation pipe 207 is made of polyurethane insulation material. Cooling water from the generator 203 is introduced into both sides of the cooling water waste heat recovery device 209, with a flow rate of 100 m³ / h. The circulating medium is heat transfer oil with an operating temperature of 60-120℃. The turbine 201 has a power of 30MW and an inlet steam pressure of 3.8MPa. The heat exchange area of ​​the exhaust steam waste heat recovery device 202 is... 500m², design pressure 1.0MPa, working temperature 120-180℃, cooling water waste heat recovery unit 209 heat exchange area 200m², design pressure 0.6MPa, working temperature 50-80℃, flue gas waste heat recovery unit 205 heat exchange area 800m², design pressure 0.8MPa, working temperature 200-350℃, circulating pump 213 flow rate 150m³ / h, head 20m, withstand temperature ≤150℃, insulation pipe 207 thermal conductivity ≤0.03W / (m•K), working pressure 1.0MPa, fourth connecting pipe 204 pressure rating PN1.6, underfloor heating coil 211 material PE-RT heat-resistant polyethylene, pipe diameter DN20, wall thickness 2mm, serpentine laying.

[0024] In some embodiments, this application also provides a waste pit (not shown) including the heating device for a waste pit in a waste-to-energy plant as described above.

[0025] In some embodiments, this application also provides a waste-to-energy plant (not shown), including the waste pool described above.

[0026] Working Principle: During winter operation, the device is first started. The high-temperature, high-pressure steam generated by the incinerator 6 enters the turbine 201 through the steam pipe 9, driving the turbine 201 to rotate. The turbine 201 drives the generator 203 to generate electricity through the flexible coupling. Simultaneously, the high-temperature flue gas in the flue gas duct 7 of the incinerator 6 flows through the first connecting pipe 206 and passes through the flue gas waste heat recovery unit 205, transferring heat to the circulating medium heat transfer oil, thus raising the temperature of the circulating medium. Next, the exhaust steam discharged from the turbine 201 enters the exhaust steam waste heat recovery unit 202, where it exchanges heat with the circulating medium, further increasing the medium temperature. At the same time, the cooling water of the generator 203 exchanges heat with the circulating medium in the cooling water waste heat recovery unit 209, continuously providing heat to the circulating medium. The circulating medium replenishes heat. Once the circulating medium has absorbed enough heat, the circulating pump 213 is turned on. After the circulating pump 213 starts, the circulating medium that has absorbed heat is collected in the insulation pipe 207 through the second connecting pipe, the third connecting pipe 210, and the fourth connecting pipe 204, and then transported to the auxiliary pipe 212 through the fifth connecting pipe 208. Then, the circulating medium is diverted to the underfloor heating coil 211 through the auxiliary pipe 212. The underfloor heating coil 211 uses thermal radiation to transfer heat to the garbage on the unloading platform 5, thereby increasing the overall temperature in the garbage pit. Through the coordinated operation of the above structures, the garbage pit 3 is heated by recovering waste heat from multiple heat sources, which can not only meet the temperature conditions required for garbage fermentation, but also achieve the purpose of energy saving and consumption reduction, and avoid energy waste.

[0027] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, still fall within the protection scope of this utility model's technical solution. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

Claims

1. A heating device for a waste-to-energy plant waste pit, comprising a concrete floor (1), a waste pit body (3) on the surface of the concrete floor (1), a discharge platform (5) on the bottom surface of the waste pit body (3), a ramp (4) at the inlet of the waste pit body (3), an incinerator (6) on the surface of the concrete floor (1), a flue gas duct (7) fixedly installed on the top surface of the incinerator (6), a chimney (8) fixedly installed on the top surface of the flue gas duct (7), and a steam pipe (9) fixedly installed on the side of the incinerator (6), characterized in that: The surface of the concrete floor (1) is provided with a waste heat recovery device (2). The waste heat recovery device (2) includes a steam turbine (201) fixedly installed on the surface of the concrete floor (1). The input end of the steam turbine (201) is connected to the steam pipe (9). The exhaust port of the steam turbine (201) is fixedly installed with a waste steam waste heat recovery device (202). The waste steam waste heat recovery device (202) is a surface heat exchanger.

2. The heating device for waste pools in a waste-to-energy plant according to claim 1, characterized in that: A generator (203) is fixedly installed on the surface of the concrete floor (1). The output shaft of the steam turbine (201) is connected to the input shaft of the generator (203) through a flexible coupling. A cooling water waste heat recovery device (209) is fixedly installed in the cooling system of the generator (203). The cooling water waste heat recovery device (209) is a plate heat exchanger. The cooling water waste heat recovery device (209) is connected in series in the cooling water circulation pipe of the generator (203). The cooling water of the generator (203) and the circulating medium are respectively introduced into the two sides of the cooling water waste heat recovery device (209).

3. A heating device for a waste-to-energy plant waste pit according to claim 2, characterized in that: A flue gas waste heat recovery device (205) is fixedly installed on the surface of the incinerator (6). The flue gas waste heat recovery device (205) is connected to the flue gas pipeline (7) through a first connecting pipe (206). The flue gas waste heat recovery device (205) is a finned tube heat exchanger.

4. A heating device for a waste-to-energy plant waste pit according to claim 3, characterized in that: The surface of the concrete floor (1) is provided with a circulating pump (213), and the output end of the circulating pump (213) is fixedly installed with an insulation pipe (207).

5. A heating device for a waste-to-energy plant waste pit according to claim 4, characterized in that: A second connecting pipe, made of seamless steel pipe, is provided between the flue gas waste heat recovery unit (205) and the insulation pipe (207). A third connecting pipe (210) is provided between the cooling water waste heat recovery unit (209) and the insulation pipe (207). A fourth connecting pipe (204) is provided between the exhaust steam waste heat recovery unit (202) and the insulation pipe (207).

6. A heating device for a waste-to-energy plant waste pit according to claim 1, characterized in that: The garbage pool body (3) is equipped with a floor heating coil (211) inside. The floor heating coil (211) is located directly below the unloading platform (5). An auxiliary pipe (212) is fixedly installed on the inner wall surface of one side of the garbage pool body (3).

7. A heating device for a waste-to-energy plant waste pit according to claim 6, characterized in that: The inlet end of the floor heating coil (211) is connected to the auxiliary pipe (212), and the auxiliary pipe (212) and the insulation pipe (207) are connected through the fifth connecting pipe (208).

8. A heating device for a waste-to-energy plant waste pit according to claim 4, characterized in that: The circulating pump (213) is a high-temperature resistant centrifugal pump, and the insulation pipe (207) is made of polyurethane insulation material.

9. A garbage pit, characterized in that... Includes the heating device for waste pools in waste-to-energy plants as described in any one of claims 1-8.

10. A waste-to-energy plant, characterized in that... Includes the waste pit as described in claim 9.

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