CN112856429A - Combined garbage pit heating system and method - Google Patents

Combined garbage pit heating system and method Download PDF

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Publication number
CN112856429A
CN112856429A CN202110227562.XA CN202110227562A CN112856429A CN 112856429 A CN112856429 A CN 112856429A CN 202110227562 A CN202110227562 A CN 202110227562A CN 112856429 A CN112856429 A CN 112856429A
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CN
China
Prior art keywords
air
flue gas
pit
primary
fan
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Pending
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CN202110227562.XA
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Chinese (zh)
Inventor
张苗
赵雷
孙晋诚
江涛
周敬
卢靖
刘诗雄
李中原
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Design Institute Of Chongqing Iron & Steel Group Co ltd
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Design Institute Of Chongqing Iron & Steel Group Co ltd
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Priority to CN202110227562.XA priority Critical patent/CN112856429A/en
Publication of CN112856429A publication Critical patent/CN112856429A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • F23G5/46Recuperation of heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50Control or safety arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2206/00Waste heat recuperation
    • F23G2206/10Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00Special features of, or arrangements for incinerators
    • F23G2900/50213Preheating processes other than drying or pyrolysis

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)

Abstract

The invention belongs to the technical field of waste incineration power generation, and particularly relates to a combined type waste pit heating system and method, wherein the heating method comprises the following steps: leading out air in the garbage storage pit, and preheating the led-out air to form primary air; and then guiding the discharged flue gas to be discharged to a chimney, pressurizing the discharged flue gas to form flue gas backflow air, mixing the flue gas backflow air with the primary air, and then returning the mixture to the garbage storage pit together. This heating system includes: the primary fan is connected with the air intake of the garbage storage pit; the air inlet of the primary air preheater is connected with the air outlet of the primary fan; and a flue gas inlet of the flue gas backflow fan is connected with an outlet of the induced draft fan, and a flue gas outlet of the flue gas backflow fan is connected to the garbage storage pit after being converged with an air outlet of the primary air preheater. The heating heat source of the garbage pit comprises primary air which is formed by pumping air in the garbage pit and preheating the air, and secondary air which is formed by leading a path of pressurized flue gas from the back of an induced draft fan and is combined with the primary air to heat the garbage pit together.

Description

Combined garbage pit heating system and method
Technical Field
The invention belongs to the technical field of waste incineration power generation, and particularly relates to a combined type waste pit heating system and method.
Background
At present, domestic waste incineration power plant all is equipped with the rubbish pond of storing rubbish, and the initial intention of its setting is to avoid burning the not enough of rubbish volume and make the incinerator stop in the short time, leads to increasing and opens, blowing out the number of times to take place the difficult problem of controlling of flue gas pollutant during this period, the effective volume in rubbish pond is confirmed according to the rubbish abundance margin of 2 ~ 3 days usually. Domestic garbage in China generally has the characteristics of high moisture and low heat value, and in order to ensure that the garbage can be fully combusted in the incinerator, the garbage needs to be stacked and fermented in a garbage pool for a period of time to drain part of moisture so as to improve the heat value of the garbage incinerated in the incinerator, so that the effective volume of the garbage pool in general engineering design is determined according to the rated garbage amount of 5-7 days. In the stacking fermentation time of normal design, the fermentation effect is mainly determined by the temperature of the garbage, the temperature is proper, the fermentation effect is good, the draining effect is good, the calorific value of the garbage burned in the furnace is relatively high, and the stable and continuous operation of the whole plant is facilitated. Usually in spring summer autumn, temperature can satisfy fermentation, waterlogging caused by excessive rainfall requirement in rubbish and the storehouse, but in winter, especially northeast cold district, the factory temperature is low to rubbish income, wherein is mingled with ice and snow piece even, leads to the interior heap of garbage bin body temperature lower, and fermentation, waterlogging caused by excessive rainfall effect are poor, greatly reduced the calorific value of advancing stove rubbish, be unfavorable for waste incineration waste heat stove steady operation, this will seriously influence stability, the continuous operation of system.
In order to ensure that the temperature of a hearth of the incinerator is kept at 850 ℃/2s, auxiliary burners are frequently used for supporting combustion, so that a large amount of combustion is consumed, and the running cost is increased. Especially for northern projects, winter heating measures must be carried out on the garbage pit. The existing heating measures are as follows: 1) the hot water circulation generated after the water source heat pump absorbs the heat of the industrial circulating water is utilized to heat the air in the garbage storage pit, so that the aims of promoting garbage fermentation and improving the heat value of the garbage are fulfilled; however, the heating system has high investment, high engineering implementation difficulty and difficult maintenance, and is not ideal in view of the current operation effect. 2) The leachate heating and back spraying technology of the garbage pool is utilized, namely air is taken from a flue gas pipeline behind an induced draft fan, the leachate stock solution is heated to about 50 ℃ after passing through a flue gas heat exchanger, then the leachate stock solution is conveyed to a 7m maintenance platform and is sprayed into a garbage pit by dividing into branches; each branch is provided with an electric gate valve for controlling spraying; however, the heating system has lower enthalpy of flue gas and more complex components, and particularly, after the leachate in the garbage pit is heated, the leachate is more seriously corroded, so that the equipment maintenance frequency is higher, and the effect is not ideal. 3) A part of main steam and steam extracted after the steam turbine works are sent to the garbage pit for heating, and meanwhile, a steam exhaust pipeline of the periodically and empty reserved flash tank is also sent to the garbage pit for heating; but is ideal from the view point of current operation effect, but needs to consume a part of main steam, reduces the power generation income and is not economical.
Disclosure of Invention
In view of the above, the present invention provides a combined garbage pit heating system and method, and aims to solve the problem of insufficient temperature of the material pile of the garbage pit in the winter of the garbage power plant.
In order to achieve the purpose, the invention provides the following technical scheme:
a combined garbage pit heating method comprises the following steps: leading out air in the garbage storage pit, and preheating the led-out air to form primary air; and then guiding the discharged flue gas to be discharged to a chimney, pressurizing the discharged flue gas to form flue gas backflow air, mixing the flue gas backflow air with the primary air, and then returning the mixture to the garbage storage pit together.
Preferably, the air led out of the garbage storage pit is as follows: and extracting the air intake port of the garbage storage pit by using a primary fan in the incinerator system.
Preferably, the air of the garbage storage pit which is led out is preheated to form primary air: and preheating the led-out air by using a primary air preheater in the incinerator system.
Preferably, the temperature of the extracted air is acquired, and the preheating of the extracted air and the mixing of the preheated primary air and the flue gas backflow air are controlled according to the acquired air temperature.
The invention also provides a combined garbage pit heating system for realizing the heating method, which comprises the following steps: the air inlet of the primary fan is connected with the air intake port of the garbage storage pit and is used for extracting air in the garbage storage pit; the air inlet of the primary air preheater is connected with the air outlet of the primary fan and is used for preheating the led air in the garbage storage pit and forming primary air; and a flue gas inlet of the flue gas reflux fan is connected with an outlet of the induced draft fan, and a flue gas outlet of the flue gas reflux fan is converged with an air outlet of the primary air preheater and used for pressurizing and refluxing the discharged flue gas of the incinerator system, mixing the flue gas with primary air and then returning the mixed flue gas into the garbage storage pit.
Furthermore, a primary air pipe connected with an air outlet of the primary air preheater, a smoke backflow air inlet pipe connected with a smoke inlet of the smoke backflow fan and a smoke backflow outlet pipe connected with a smoke outlet of the smoke backflow fan are respectively provided with a valve A, a valve B and a valve C, and a mixed air pipe connected with the garbage storage pit is connected with the smoke backflow outlet pipe and the primary air pipe.
Further, the valve A, the valve B and the valve C are all electric valves or pneumatic valves with remote control.
Further, an air bypass pipe is arranged on the smoke return air inlet pipe, and a silencer is connected to the air bypass pipe.
Furthermore, a deodorizing air pipeline is also arranged on the flue gas backflow air inlet pipe.
Furthermore, an air outlet of the primary air preheater and a smoke outlet of the smoke backflow fan are both connected with the incinerator.
The invention has the beneficial effects that: the invention utilizes the waste heat (the temperature of the flue gas is about 180 ℃) of the flue gas discharged from the incinerator system to return to the garbage storage pit so as to raise the temperature of the garbage pool material pile in the garbage storage pit; meanwhile, air in the garbage storage pit is led out and preheated to form primary air, so that the primary air is mixed with the flue gas backflow air, the garbage storage pit is more favorably conveyed back, and the internal temperature of the garbage storage pit is improved. In addition, after the incinerator is shut down, the flue gas backflow inlet pipe can be used for discharging the deodorizing air to the chimney, so that the deodorizing air is discharged to the atmosphere through the chimney, a deodorizing exhaust pipeline is not additionally arranged in the garbage storage pit, and partial investment is saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the modular refuse pit heating system of the present invention.
Reference numerals: 1 is rubbish storage pit, 2 is getting the wind gap, 3 is a fan, 4 is a wind air preheater, 5 is valve A, 6 is a tuber pipe, 7 is valve B, 8 is flue gas backward flow wind exit tube, 9 is mixed tuber pipe, 10 is flue gas backward flow fan, 11 is the deodorization wind pipeline, 12 is the muffler, 13 is the air bypass pipe, 14 is flue gas backward flow wind admission pipe, 15 is valve C, 16 is steam gas heat exchanger, 17 is the denitrator, 18 is the draught fan, 19 is the chimney.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Referring to fig. 1, the present embodiment relates to a combined garbage pit heating system, which is an improvement on the existing incinerator system, and solves the problem of insufficient temperature of the garbage pit material pile in the winter of the garbage power plant by comprehensively utilizing the components and the exhaust gas of the incinerator system. The incinerator system mainly comprises an incinerator (not shown), a primary fan 3, a garbage storage pit 1, a primary air preheater 4, a steam-flue gas heat exchanger 16, a denitrator 17, an induced draft fan 18, a chimney 19 and the like, wherein the primary fan 3 and the primary air preheater 4 are used for providing primary air for the incinerator, and flue gas generated in the incinerator system is led out by the induced draft fan 18 and is led to the chimney 19 after being treated by the steam-flue gas heat exchanger 16 and the denitrator 17. The heating heat source of the combined garbage pit heating system is combined from two sides, firstly, a primary air blower 3 is utilized to pass through a pipeline, the air inlet of the primary air blower is connected with an air intake port 2 of a garbage storage 1 so as to extract low-temperature air in the garbage storage pit, the air outlet of the primary air blower is connected with an air inlet of a primary air preheater so as to output preheated primary air at an air outlet of the primary air preheater after the primary air preheater carries out heat exchange on the low-temperature air entering the primary air preheater, the primary air is divided into two paths, one path of primary air is sent to an incinerator to supply air to the incinerator, and the other path of primary air is sent to a mixed air pipe 9 leading to the garbage storage pit 1 through a primary air pipe 6; and secondly, a flue gas backflow fan 10 is arranged on a pipeline between a chimney 19 and an induced draft fan 18, namely a flue gas inlet of the flue gas backflow fan 10 is connected with an outlet of the induced draft fan 18 through a flue gas backflow air inlet pipe 14, a flue gas outlet of the flue gas backflow fan is divided into two paths, one path of flue gas backflow air is sent to the incinerator for supplying air to the incinerator, the other path of flue gas backflow air is sent to a mixed air pipe 9 passing through the garbage storage pit 1 through a flue gas backflow air outlet pipe 8, so that flue gas backflow air formed by pressurizing discharged flue gas of the incinerator system and primary air are mixed in the mixed air pipe 9 and then are conveyed back to the garbage storage pit 1, and the temperature of a garbage pit material pile is raised.
In this embodiment, the primary air duct 6 connected to the air outlet of the primary air preheater 4, the flue gas backflow air inlet duct 14 connected to the flue gas inlet of the flue gas backflow fan 10, and the flue gas backflow outlet duct 8 connected to the flue gas outlet of the flue gas backflow fan 10 are respectively provided with a valve a5, a valve B7, and a valve C15, which are used for adjusting the air volume of the primary air or the flue gas backflow air, so as to meet the requirement of the operation of the incinerator and also perform the temperature raising operation on the garbage pit. Meanwhile, the valve A, the valve B and the valve C are both electric valves or pneumatic valves with remote control, so that automation control and opening degree adjustment are facilitated.
In this embodiment, an air bypass pipe 13 is disposed on the flue gas backflow air inlet pipe 14, and a silencer 12 is connected to the air bypass pipe 13 to perform silencing treatment on the flue gas backflow air.
The flue gas backflow air inlet pipe 14 in the embodiment is also provided with a deodorizing air pipeline 11. On one hand, the flue gas can flow back into the garbage storage pit along with the flue gas to deodorize the garbage storage pit; on the other hand, after the incinerator is stopped, the flue gas backflow inlet pipe can be used for discharging the deodorizing air to the chimney so as to discharge the deodorizing air to the atmosphere through the chimney, so that a deodorizing exhaust pipeline is not additionally arranged in the garbage storage pit, and partial investment is saved.
Firstly, leading out air in the garbage storage pit through a primary fan, and preheating the led-out air by using a primary air preheater to form primary air; then, the discharged flue gas to be discharged to a chimney is guided after the induced draft fan, and the discharged flue gas is pressurized by a flue gas reflux fan to form flue gas reflux air; and finally, mixing the flue gas backflow air and the primary air and then returning the mixture to the garbage storage pit together. Therefore, the invention utilizes the waste heat (the temperature of the flue gas is about 180 ℃) of the flue gas discharged from the incinerator system to feed back to the garbage storage pit so as to raise the temperature of the garbage pool material pile in the garbage storage pit; meanwhile, air in the garbage storage pit is led out and preheated to form primary air, so that the primary air is mixed with the flue gas backflow air, the garbage storage pit is more favorably conveyed back, and the internal temperature of the garbage storage pit is improved.
In addition, the temperature of the extracted air can be acquired, and the preheating of the extracted air and the mixing of the preheated primary air and the flue gas backflow air can be controlled according to the acquired air temperature. Namely, the regulation and control are carried out through a valve A, a valve B and a valve C.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. A combined garbage pit heating method is characterized by comprising the following steps: leading out air in the garbage storage pit, and preheating the led-out air to form primary air; and then guiding the discharged flue gas to be discharged to a chimney, pressurizing the discharged flue gas to form flue gas backflow air, mixing the flue gas backflow air with the primary air, and then returning the mixture to the garbage storage pit together.
2. The combined pit heating method of claim 1, wherein the air drawn out of the pit is: and extracting the air intake port of the garbage storage pit by using a primary fan in the incinerator system.
3. The combined refuse pit heating method according to claim 1, wherein the preheating of the led-out refuse storage pit air to form primary air is: and preheating the led-out air by using a primary air preheater in the incinerator system.
4. A combined refuse pit heating method according to any one of claims 1-3, characterized in that the temperature of the lead-out air is obtained, and the preheating of the lead-out air and the mixing of the preheated primary air and the flue gas recirculation air are controlled according to the obtained air temperature.
5. Combined refuse pit heating system, characterized in that it is used to implement the heating method according to any one of claims 1-4, comprising: the air inlet of the primary fan (3) is connected with the air intake (2) of the garbage storage pit (1) and is used for extracting air in the garbage storage pit; the air inlet of the primary air preheater (4) is connected with the air outlet of the primary fan and is used for preheating the led air in the garbage storage pit and forming primary air; and a flue gas inlet of the flue gas backflow fan (10) is connected with an outlet of the induced draft fan (18), and a flue gas outlet of the flue gas backflow fan is converged with an air outlet of the primary air preheater and is used for pressurizing and refluxing the discharged flue gas of the incinerator system, mixing the flue gas with the primary air and then returning the flue gas into the garbage storage pit.
6. A combined refuse pit heating system according to claim 5, characterized in that the primary air pipe (6) connected to the air outlet of the primary air preheater, the flue gas return air inlet pipe (14) connected to the flue gas inlet of the flue gas return fan, and the flue gas return outlet pipe (8) connected to the flue gas outlet of the flue gas return fan are respectively provided with a valve A (5), a valve B (7), and a valve C (15), and the mixed air pipe (9) connected to the refuse storage pit is connected to both the flue gas return outlet pipe and the primary air pipe.
7. The modular trash pit heating system of claim 6, wherein the valves a, B, C are all electrically or pneumatically operated valves with remote control.
8. Combined refuse pit heating system according to claim 6, characterized in that the flue gas return air intake pipe is provided with an air bypass pipe (13) to which a silencer (12) is connected.
9. The combined refuse pit heating system according to claim 6, characterized in that the flue gas return air inlet pipe is further provided with a deodorizing air duct (11).
10. The combined garbage pit heating system according to any one of claims 5-9, wherein the air outlet of the primary air preheater and the flue gas outlet of the flue gas recirculation fan are both further connected to the incinerator.
CN202110227562.XA 2021-03-01 2021-03-01 Combined garbage pit heating system and method Pending CN112856429A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115854348A (en) * 2022-12-08 2023-03-28 中节能(象山)环保能源有限公司 Intelligent heating system for waste incineration

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JP2012087977A (en) * 2010-10-19 2012-05-10 Takuma Co Ltd Incineration equipment and operation method of the same
CN106287730A (en) * 2016-08-17 2017-01-04 重庆钢铁集团设计院有限公司 A kind of garbage storing hole heating means
CN106907719A (en) * 2017-02-28 2017-06-30 重庆三峰环境产业集团有限公司 A kind of utilization garbage burning factory used heat improves the method and system of refuse thermal value
CN207936094U (en) * 2018-02-27 2018-10-02 重庆钢铁集团设计院有限公司 A kind of smoke waste heat utilization system
CN111322622A (en) * 2020-03-25 2020-06-23 青岛达能环保设备股份有限公司 Flue gas waste heat recovery system for drying garbage by utilizing flue gas waste heat to improve heat value
CN112393266A (en) * 2020-11-20 2021-02-23 西安热工研究院有限公司 System for heating garbage pit by utilizing flue gas waste heat in garbage incineration power station
CN214468637U (en) * 2021-03-01 2021-10-22 重庆钢铁集团设计院有限公司 Combined garbage pit heating system
CN221146542U (en) * 2023-10-31 2024-06-14 阳谷新源热电有限公司 Mixed type rubbish pit heating system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012087977A (en) * 2010-10-19 2012-05-10 Takuma Co Ltd Incineration equipment and operation method of the same
CN106287730A (en) * 2016-08-17 2017-01-04 重庆钢铁集团设计院有限公司 A kind of garbage storing hole heating means
CN106907719A (en) * 2017-02-28 2017-06-30 重庆三峰环境产业集团有限公司 A kind of utilization garbage burning factory used heat improves the method and system of refuse thermal value
CN207936094U (en) * 2018-02-27 2018-10-02 重庆钢铁集团设计院有限公司 A kind of smoke waste heat utilization system
CN111322622A (en) * 2020-03-25 2020-06-23 青岛达能环保设备股份有限公司 Flue gas waste heat recovery system for drying garbage by utilizing flue gas waste heat to improve heat value
CN112393266A (en) * 2020-11-20 2021-02-23 西安热工研究院有限公司 System for heating garbage pit by utilizing flue gas waste heat in garbage incineration power station
CN214468637U (en) * 2021-03-01 2021-10-22 重庆钢铁集团设计院有限公司 Combined garbage pit heating system
CN221146542U (en) * 2023-10-31 2024-06-14 阳谷新源热电有限公司 Mixed type rubbish pit heating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115854348A (en) * 2022-12-08 2023-03-28 中节能(象山)环保能源有限公司 Intelligent heating system for waste incineration

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