CN210595735U - System for thermal power plant's boiler flue gas pyrolysis mud - Google Patents
System for thermal power plant's boiler flue gas pyrolysis mud Download PDFInfo
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- CN210595735U CN210595735U CN201921509234.3U CN201921509234U CN210595735U CN 210595735 U CN210595735 U CN 210595735U CN 201921509234 U CN201921509234 U CN 201921509234U CN 210595735 U CN210595735 U CN 210595735U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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Abstract
The utility model provides a system of thermal power plant's boiler flue gas pyrolysis mud, thermal power plant include power plant boiler and steam turbine, the system includes: a high-temperature flue gas pipeline for leading high-temperature flue gas out of the power station boiler; the low-temperature flue gas is sent back to a low-temperature flue gas pipeline of the power station boiler; the sludge storage tank is used for storing sludge which is divided into a liquid phase layer and a solid phase layer in a standing state, the high-temperature flue gas pipeline is communicated with the drying and volatilizing furnace, and the drying and volatilizing furnace uses the high-temperature flue gas as a heat source to dry and heat the conveyed solid phase layer sludge; the high-temperature flue gas pipeline is also communicated with the pyrolysis furnace and is used as a heat source of the pyrolysis furnace to pyrolyze the sludge which is positioned in the furnace and dried by the drying volatilization furnace. Through the utility model discloses a system of thermal power plant's boiler flue gas pyrolysis mud can utilize power plant boiler exhaust high temperature flue gas etc. to make mud dry, decompose as the heat source, can pyrolyze mud with low energy consumption from this.
Description
Technical Field
The utility model relates to a mud pyrolysis technology, in particular to system for thermal power plant's boiler flue gas pyrolysis mud that utilizes the waste heat of thermal power plant's boiler to come pyrolysis mud.
Background
Municipal sewage sludge has become one of the most serious public hazards in the world today. At present, the municipal sludge treatment modes widely adopted at home and abroad mainly comprise 4 types of sanitary landfill, incineration, composting and comprehensive utilization. At present, sludge incineration plants for sludge treatment by incinerating sludge are increasing. However, direct sludge incineration has problems of difficulty in ignition, unstable combustion, and easy generation of dioxin. In order to ensure stable combustion, many sludge incineration plants mix and burn coal, gas or oil, which increases the consumption of afterburning fuel of the sludge incineration plants.
Therefore, a sludge incineration system that has little environmental impact and low fuel consumption is demanded.
SUMMERY OF THE UTILITY MODEL
The present application has been made in view of the above-described problems occurring in the prior art, and an object of the present application is to provide a pyrolytic sludge system that has a small environmental impact and can significantly reduce the amount of supplementary fuel consumption, that is, a system for pyrolyzing sludge in boiler flue gas of a thermal power plant.
In order to achieve the above object, the present application adopts the following technical means.
The utility model provides a system for thermal power plant's boiler flue gas pyrolysis mud, thermal power plant includes power boiler and steam turbine, the characterized in that of system includes:
a high-temperature flue gas pipeline for leading high-temperature flue gas out of the power station boiler;
the low-temperature flue gas is sent back to a low-temperature flue gas pipeline of the power station boiler; and
a sludge storage tank, a drying and volatilizing furnace and a pyrolyzing furnace which are connected in sequence,
the sludge storage tank is stored with sludge which is divided into a liquid phase layer and a solid phase layer under a standing state,
the high-temperature flue gas pipeline is communicated with the drying and volatilizing furnace, and the drying and volatilizing furnace uses high-temperature flue gas as a heat source to dry and heat the conveyed solid-phase layer sludge;
the high-temperature flue gas pipeline is also communicated with the pyrolysis furnace and is used as a heat source of the pyrolysis furnace to pyrolyze the sludge which is positioned in the furnace and dried by the drying volatilization furnace.
In foretell system of thermal power plant's boiler flue gas pyrolysis mud, it is preferred that, high temperature flue gas pipeline connect gradually along the flow direction of high temperature flue gas power plant's boiler with between the pyrolysis oven with between the dry stove of volatilizing.
In the system for pyrolyzing sludge by using boiler flue gas of a thermal power plant, the system preferably further comprises a gas-water oil separator for separating water, oil and combustible gas from each other, and the drying and volatilizing furnace is provided with a gas-water oil pipeline for conveying a mixture of evaporated and volatilized water, oil and gas; the gas-water oil pipeline is connected with the gas-water oil separator; the pyrolysis furnace is provided with a pyrolysis gas conveying pipeline, and the pyrolysis gas conveying pipeline is connected with the gas-water oil separator; the output end of the gas-water oil separator is connected with a storage tank for storing water, oil and combustible gas respectively or pipelines for conveying water, oil and combustible gas respectively.
In the system for pyrolyzing sludge by using boiler flue gas of a thermal power plant, the high-temperature flue gas pipeline is respectively communicated with the flue gas heat exchange pipeline in the drying volatilization furnace and the pyrolysis furnace, and the sludge is heated in a manner that the high-temperature flue gas does not contact the sludge; or, the high-temperature flue gas pipeline is respectively communicated with the heating cavities of the drying and volatilizing furnace and the pyrolysis furnace, and the sludge is heated in a mode that the high-temperature flue gas contacts the sludge.
In the above system for pyrolyzing sludge by using boiler flue gas of a thermal power plant, the storage tank for combustible gas or the pipeline for combustible gas may be communicated with the furnace chamber of the power plant boiler and the afterburning chamber of the system for pyrolyzing sludge by using boiler flue gas of the thermal power plant.
In foretell system of thermal power boiler flue gas pyrolysis mud, it is preferred that low temperature flue gas pipeline with dry volatilize the stove with the pyrolysis oven is individual flue gas heat transfer pipe connects, low temperature flue gas pipeline via the draught fan connect in the furnace of power boiler or the flue of boiler.
In the above-mentioned system for pyrolyzing sludge by using boiler flue gas of a thermal power plant, the gas-water oil separator may include a condensing unit for condensing water vapor,
and a condensate water outlet of the condensing unit is connected with a steam-water circulating system or a cooling water system of the thermal power plant.
In foretell system of thermal power plant boiler flue gas pyrolysis mud, the pyrolysis oven can include the afterburning chamber, the afterburning chamber with the pipe connection of combustible gas, high temperature flue gas pipeline passes through the afterburning chamber, the combustible gas is in the burning in the afterburning chamber is so that high temperature flue gas temperature in the high temperature flue gas pipeline further risees.
Effect of the utility model
The utility model discloses has following technological effect:
(1) because the high-temperature flue gas and/or the high-temperature steam of the power station boiler are/is used as a heat source, the consumption of fuel can be reduced, no extra pollution is generated, and therefore, the sludge treatment can be carried out in an environment-friendly mode.
(2) Because the high-temperature flue gas is changed into the low-temperature flue gas after heat exchange, the influence on the environment temperature and the like is small when the high-temperature flue gas is discharged into the atmospheric environment.
(3) Since the condensed water generated in the drying furnace and the like is also recovered to the steam circulation system of the thermal power plant, the additional consumption of water can be reduced.
(4) Because the pyrolysis furnace still is equipped with afterburning chamber to the combustible pyrolysis gas that utilizes the pyrolysis to produce heats the high temperature flue gas of process in afterburning chamber, consequently, can utilize combustible pyrolysis gas nearby and do not need extra fuel, can adjust the high temperature flue gas to the high temperature that is suitable for the mud pyrolysis moreover, is favorable to improving the efficiency and the sufficiency of mud pyrolysis.
(5) The evaporation capacity of the power station boiler is reduced by utilizing the heat of the flue gas of the power station boiler, and the peak shaving requirements of a thermal power plant and a power grid are further responded.
Drawings
Fig. 1 is a schematic diagram of a system for pyrolyzing sludge by using boiler flue gas of a thermal power plant according to an embodiment of the present invention.
Description of the reference numerals
21 utility boilers; 22 a steam turbine; 1, a sludge storage pool; 2 drying and volatilizing the furnace;
3, a pyrolysis furnace; 6 gas-water-oil separating device; 7 multi-fuel burners; an IDF draught fan;
w a water storage tank; an O oil storage tank; g gas storage tank.
Detailed Description
For making the purpose, technical scheme and effect of the utility model clearer, will combine below the embodiment of the utility model, it is right the technical scheme of the utility model carry out more detailed description.
In the description of the present specification, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and unless otherwise specified, the terms are only used for clarity and conciseness to illustrate the technical solutions, and do not limit the scope of the present invention.
The technical solution of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the system for pyrolyzing sludge by using flue gas of a boiler of a thermal power plant comprises a power station boiler 21, a steam turbine 22, and a sludge storage tank 1, a sludge conveying device (not shown), a drying and volatilizing furnace 2 and a pyrolysis furnace 3 which are connected in sequence. The sludge storage tank stores sludge which is initially divided into a liquid phase layer and a solid phase layer by standing. The sludge conveying device is connected between the sludge storage tank 1 and the drying volatilization furnace 2. The sludge in the sludge storage tank 1 is sent to the drying and volatilizing furnace 2 through a sludge conveying device.
The drying and volatilizing furnace 2 is used for drying the solid-phase layer sludge and evaporating water in the solid-phase layer sludge. The number of the drying and volatilizing furnaces 2 can be 1, and can also be 2 or more. Fig. 1 shows an example in which 1 dry volatilization oven 2 is provided. The position of the drying and volatilizing furnace 2 is not particularly limited, and it is preferably provided in the vicinity of the sludge storage tank 1.
The pyrolysis furnace 3 is used for pyrolyzing the dried sludge into pyrolysis mixed gas and ash, and is generally provided with a feed inlet at the upper end and a slag discharge port at the lower end, and can also comprise a catalyst adding port. The number of the pyrolysis furnaces 3 may be 1 or 2 or more, and in the present embodiment, only 1 is provided, and the pyrolysis furnace 3 is preferably provided in the vicinity of the utility boiler, and more preferably in the vicinity of the utility boiler in the vicinity of the sludge storage tank 1.
The utility boiler 21 is provided with a high-temperature flue gas pipeline for leading out high-temperature flue gas in the boiler, a low-temperature flue gas pipeline for returning low-temperature flue gas cooled after external circulation to the utility boiler 21, and a flue for leading waste flue gas in the boiler to the atmospheric environment.
A flue gas heat exchange pipeline is arranged in the pyrolysis furnace 3. The high-temperature flue gas pipeline is led out from the power station boiler 21 and then communicated with the inlet end of the flue gas heat exchange pipeline of the pyrolysis furnace 3. Preferably, a valve (not shown) is provided between the utility boiler 22 and the pyrolysis furnace 3, and the amount of the high-temperature flue gas supplied from the utility boiler 22 to the pyrolysis furnace 3 can be effectively controlled by controlling the valve. The high-temperature flue gas flows in the heat exchange pipeline and exchanges heat with the gas environment in the furnace chamber of the pyrolysis furnace, so that the heating effect is achieved. The high-temperature flue gas which completes the heat exchange flows out from the outlet end of the flue gas heat exchange pipeline. Of course, the temperature of the flue gas at the outlet end of the flue gas heat exchange pipeline is lower than that at the inlet end of the flue gas heat exchange pipeline.
The pyrolysis furnace 3 includes at least a pyrolysis gasification chamber in which the sludge is pyrolyzed into pyrolysis gas (e.g., hydrogen-rich pyrolysis mixed gas) and ash. The pyrolysis furnace 3 adopts low-temperature pyrolysis (the pyrolysis temperature is between 300 and 600 ℃) or high-temperature pyrolysis (the pyrolysis temperature is between 600 and 800 ℃).
The pyrolysis mixed gas discharge port of the pyrolysis furnace 3 is connected to an air-water separator 6, and the pyrolysis mixed gas is separated into water, oil and combustible gas (e.g., hydrogen) by the air-water separator, and is partially stored in the water storage tank W, the oil storage tank O and the gas storage pipe G. Of course, the combustible gas may be fed to a multi-fuel burner 7 provided in the utility boiler through a feed pipe for combustion, or may be fed to a post-combustion chamber of the pyrolysis furnace 3 as fuel (described later). The ash generated by pyrolysis in the pyrolysis furnace 3 is treated with solid waste together with the ash or fly ash of the power station boiler.
The pyrolysis furnace 3 may include a afterburning chamber (not shown) in addition to the pyrolysis gasification chamber. The high-temperature flue gas that comes from high-temperature flue gas pipeline transport can be earlier through afterburning the intensification of afterburning room, then gets into pyrolysis gasification room, can further improve the ambient temperature in the pyrolysis gasification room from this (for example be applicable to high-temperature pyrolysis), improves pyrolysis efficiency and sufficiency. As fuel for the afterburner, pyrolysis gas obtained by pyrolysis of waste in the pyrolysis gasification chamber, for example, pyrolysis mixed gas rich in hydrogen, can be used. The pyrolysis gas is combusted in the afterburning chamber to generate harmless ash, and finally the flue gas is discharged into a flue of a power station boiler
Certainly, the pyrolysis furnace 3 may not be provided with a flue gas heat exchange pipeline, and the high-temperature flue gas pipeline is led out from the utility boiler 21 and then directly communicated with the furnace chamber (or the pyrolysis gasification chamber) of the pyrolysis furnace 3.
A high-temperature flue gas pipeline is arranged between the flue gas outlet of the pyrolysis furnace 3 or the outlet end of the flue gas heat exchange pipeline of the pyrolysis furnace 3 and the drying volatilization furnace 2. The high-temperature flue gas with the temperature reduced after the heat exchange in the pyrolysis furnace 3 is conveyed to the drying and volatilizing furnace 2.
A flue gas heat exchange pipeline is arranged in the drying and volatilizing furnace 2. The inlet end of the flue gas heat exchange pipeline is communicated with a high-temperature flue gas pipeline at the downstream side of the pyrolysis furnace 3. The high-temperature flue gas exchanges heat with the gas environment in the furnace chamber of the drying and volatilizing furnace while flowing in the heat exchange pipeline, and plays a role in heating to evaporate the moisture in the solid-phase sludge. The high-temperature flue gas which has completed the heat exchange flows out from the outlet end of the flue gas heat exchange pipeline of the drying and volatilizing furnace 2, and is conveyed to the hearth of the utility boiler 21 or the flue of the utility boiler through the low-temperature flue gas pipeline communicated with the outlet end. Of course, an induced draft fan IDF can be arranged in the low-temperature flue gas pipeline to promote the backflow of the low-temperature flue gas.
Certainly, the drying and volatilizing furnace 2 may not be provided with a flue gas circulation pipeline, but the high-temperature flue gas directly circulates and exchanges heat in the furnace chamber of the drying and volatilizing furnace 2.
The gas-water separator is provided with a moisture recovery device for condensing and recovering water vapor. The gas-water oil separator 6 utilizes cooling water of a thermal power plant to carry out interval type heat exchange cooling, thereby condensing and recovering water. The input end of the moisture recovery device 5 is connected with the drying and volatilizing furnace 2 and the pyrolysis furnace 3, and the water vapor generated in the drying and volatilizing furnace is condensed and recovered. The output end of the moisture recovery device can be connected to the water storage pipe W and also can be connected to a steam-water circulating system or a cooling water system of a thermal power plant. The gas-water oil separator 6 recovers oil by gravity stratification.
And carrying out harmless treatment on the waste water, waste residue, waste liquid and waste gas generated by the sludge pyrolysis system by utilizing an environment-friendly treatment facility in the thermal power plant. As the gas detoxifying system, for example, a flue gas treatment device, an activated carbon adsorption device, a dust collector 63, and the like provided in a flue of a utility boiler are detoxified, and then discharged to the atmosphere from a discharge port of the flue.
The embodiments of the present invention have been described above. It should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto. Those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essential aspects.
Claims (8)
1. The utility model provides a system for thermal power plant's boiler flue gas pyrolysis mud, thermal power plant includes power boiler and steam turbine, its characterized in that includes:
a high-temperature flue gas pipeline for leading high-temperature flue gas out of the power station boiler;
the low-temperature flue gas is sent back to a low-temperature flue gas pipeline of the power station boiler; and
a sludge storage tank, a drying and volatilizing furnace and a pyrolyzing furnace which are connected in sequence,
the sludge storage tank is stored with sludge which is divided into a liquid phase layer and a solid phase layer under a standing state,
the high-temperature flue gas pipeline is communicated with the drying and volatilizing furnace, and the drying and volatilizing furnace uses high-temperature flue gas as a heat source to dry and heat the conveyed solid-phase layer sludge;
the high-temperature flue gas pipeline is also communicated with the pyrolysis furnace and is used as a heat source of the pyrolysis furnace to pyrolyze the sludge which is positioned in the furnace and dried by the drying volatilization furnace.
2. The system for pyrolyzing sludge by using boiler flue gas of a thermal power plant according to claim 1,
the high-temperature flue gas pipeline is connected in proper order along the flow direction of high-temperature flue gas power boiler with between the pyrolysis oven with between the dry stove that volatilizees.
3. The system for pyrolyzing sludge by using boiler flue gas of a thermal power plant according to claim 1 or 2, further comprising a gas-water separator for separating moisture, oil and combustible gas from each other,
the drying and volatilizing furnace is provided with an air-water oil pipeline for conveying a mixture of evaporated and volatilized water, oil and gas; the gas-water oil pipeline is connected with the gas-water oil separator;
the pyrolysis furnace is provided with a pyrolysis gas conveying pipeline, and the pyrolysis gas conveying pipeline is connected with the gas-water oil separator;
the output end of the gas-water oil separator is connected with a storage tank for storing water, oil and combustible gas respectively or pipelines for conveying water, oil and combustible gas respectively.
4. The system for pyrolyzing sludge by using boiler flue gas of a thermal power plant according to claim 1 or 2,
the high-temperature flue gas pipeline is respectively communicated with the flue gas heat exchange pipelines in the drying and volatilizing furnace and the pyrolysis furnace, and the sludge is heated in a mode that the high-temperature flue gas does not contact the sludge; or the high-temperature flue gas pipeline is respectively communicated with the heating cavities of the drying and volatilizing furnace and the pyrolysis furnace, and the sludge is heated in a mode that the high-temperature flue gas contacts the sludge.
5. The system for pyrolyzing sludge by using boiler flue gas of a thermal power plant according to claim 3,
the storage tank of the combustible gas or the pipeline of the combustible gas is communicated with the hearth of the power station boiler and the afterburning chamber of the system for pyrolyzing sludge by using the flue gas of the boiler of the thermal power plant.
6. The system for pyrolyzing sludge by using boiler flue gas of a thermal power plant according to claim 4,
the low temperature flue gas pipeline with dry volatilizing furnace with the pyrolysis oven is respective the flue gas heat transfer pipe connects, low temperature flue gas pipeline via the draught fan connect in the furnace of power plant boiler or the flue of boiler.
7. The system for pyrolyzing sludge according to boiler flue gas of a thermal power plant as claimed in claim 3, wherein said gas-water separator includes a condensing unit for condensing water vapor,
and a condensate water outlet of the condensing unit is connected with a steam-water circulating system or a cooling water system of the thermal power plant.
8. The system for pyrolyzing sludge according to boiler flue gas of a thermal power plant as claimed in claim 3, wherein the pyrolysis furnace comprises an afterburning chamber, the afterburning chamber is connected with the pipeline of the combustible gas, the high-temperature flue gas pipeline passes through the afterburning chamber, and the combustible gas is combusted in the afterburning chamber to further raise the temperature of the high-temperature flue gas in the high-temperature flue gas pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921509234.3U CN210595735U (en) | 2019-09-10 | 2019-09-10 | System for thermal power plant's boiler flue gas pyrolysis mud |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921509234.3U CN210595735U (en) | 2019-09-10 | 2019-09-10 | System for thermal power plant's boiler flue gas pyrolysis mud |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113416562A (en) * | 2021-07-16 | 2021-09-21 | 中煤能源研究院有限责任公司 | Oxygen-enriched low-carbon pyrolysis system utilizing boiler flue gas and using method |
| CN115046207A (en) * | 2022-06-10 | 2022-09-13 | 西安热工研究院有限公司 | Method and system for improving denitration flue gas temperature through pyrolysis gas afterburning |
| CN115549114A (en) * | 2022-11-03 | 2022-12-30 | 中国电力工程顾问集团有限公司 | System and method for adjusting peak and frequency of sludge mixed combustion |
-
2019
- 2019-09-10 CN CN201921509234.3U patent/CN210595735U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113416562A (en) * | 2021-07-16 | 2021-09-21 | 中煤能源研究院有限责任公司 | Oxygen-enriched low-carbon pyrolysis system utilizing boiler flue gas and using method |
| CN115046207A (en) * | 2022-06-10 | 2022-09-13 | 西安热工研究院有限公司 | Method and system for improving denitration flue gas temperature through pyrolysis gas afterburning |
| CN115549114A (en) * | 2022-11-03 | 2022-12-30 | 中国电力工程顾问集团有限公司 | System and method for adjusting peak and frequency of sludge mixed combustion |
| CN115549114B (en) * | 2022-11-03 | 2023-04-25 | 中国电力工程顾问集团有限公司 | System and method for mixing and burning sludge, peak regulation and frequency modulation |
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