CN211551605U - Pyrolysis gas cooling system of pyrolysis furnace of thermal power plant - Google Patents
Pyrolysis gas cooling system of pyrolysis furnace of thermal power plant Download PDFInfo
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- CN211551605U CN211551605U CN201921740726.3U CN201921740726U CN211551605U CN 211551605 U CN211551605 U CN 211551605U CN 201921740726 U CN201921740726 U CN 201921740726U CN 211551605 U CN211551605 U CN 211551605U
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Abstract
The utility model discloses a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, including power plant boiler and air supply system, steam turbine and steam-water system thereof, still include pyrolysis furnace and pyrolysis gas cooling purification and separation device thereof, be provided with heat transfer device among the pyrolysis gas cooling purification and separation device, heat transfer device is air cooled heat exchanger and/or water cooled heat exchanger, cooling medium among air cooled heat exchanger and/or the water cooled heat exchanger is right pyrolysis gas among the pyrolysis gas cooling purification and separation device cools off, the cooling medium that the air cooled heat exchanger export has been heated can be carried into in power plant boiler or the powder process system, the cooling medium that the water cooled heat exchanger export has been heated can be carried into in boiler water supply pipe or oxygen-eliminating device water supply pipe or the heating network circulating water supply pipe. The utility model discloses simple structure, wind and/or water that need heat in the heat heating thermal power plant system of release when can make full use of pyrolysis gas cooling reduce its energy consumption, are showing improvement energy utilization.
Description
Technical Field
The utility model relates to a pyrolysis technical field particularly, relates to a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant.
Background
Researches show that coal has high oil and gas resources. Therefore, the coal pyrolysis technology can improve the utilization efficiency of coal, and the pyrolysis products of coal tar and pyrolysis gas can be used as supplement of petroleum and natural gas. In addition, the steel industry consumes a large amount of coke every year, and high-quality coke is produced by a coal coking furnace. In recent years, the coke yield of our country accounts for more than half of the total world yield, and has become the largest coke production and export country in the world. Therefore, the rapid development of the coking technology is stimulated, the number of newly-built and modified coke ovens is increased linearly, and the large-scale proportion of the coke ovens is obviously improved; a batch of new technologies such as raw gas waste heat utilization, dry pyrolysis gas cooling, tamping coking, coking production automation and the like are popularized and applied.
Biomass is a clean renewable energy source, and a biomass fast pyrolysis technology is an important way for biomass utilization, namely pyrolysis is a process of breaking molecular bonds of large molecular weight organic matters and hydrocarbons by using heat energy to convert the large molecular weight organic matters and the hydrocarbons into low molecular weight substances containing a small number of carbon atoms. Biomass pyrolysis is a biomass thermal degradation process in which biomass produces three products, liquid (bio-oil), gas (combustible gas) and solid (coke) under a completely anoxic condition.
In addition, with the development of industry and cities, the production amount of municipal garbage, sludge and industrial oil sludge is increasing, and the urban environmental protection puts higher requirements on the treatment of garbage and sludge. With occupation and pollution of a large amount of land by garbage and sludge landfill sites, harmless treatment of garbage or sludge by adopting a pyrolysis process becomes a unique option in the future.
In the pyrolysis process of the coal, the biomass, the garbage or the sludge, the heat carried by the pyrolysis gas accounts for more than 30%, and how to cool the pyrolysis gas and utilize the heat in the pyrolysis gas further extracts tar, coal gas, biomass gas, oil gas and other combustible gases from the pyrolysis gas becomes a key for improving the economy and the energy utilization efficiency of a pyrolysis project. At present, the conventional cooling mode adopted is water cooling or air cooling, but after the heat exchange between the cooling water or the cooling air and the pyrolysis gas, the heat is dissipated to the atmosphere through a cooling water tower or an air cooling radiator, and the heat is completely wasted, so that the whole energy efficiency of the pyrolysis furnace is low.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problem that the heat released by the cooling of the pyrolysis gas in the pyrolysis gas cooling, purifying and separating device is not fully utilized.
In order to solve the problem, the utility model provides a pyrolysis furnace pyrolysis gas cooling system of thermal power plant, including power plant boiler and air supply system, steam turbine and steam-water system thereof, still include pyrolysis furnace and pyrolysis gas cooling purification and separation device, be provided with heat transfer device among the pyrolysis gas cooling purification and separation device, heat transfer device is air-cooled heat exchanger and/or water cooled heat exchanger, cooling medium among air-cooled heat exchanger and/or the water cooled heat exchanger is right pyrolysis gas among the pyrolysis gas cooling purification and separation device cools off, the cooling medium that the air-cooled heat exchanger export has been heated can be carried into in power plant boiler or the powder process system, the cooling medium that the water cooled heat exchanger export has been heated can be carried into in boiler water supply pipeline or oxygen-eliminating water supply pipeline or the heat supply network circulating water supply pipeline.
The raw materials decomposed by the pyrolysis furnace can be any one or more of raw coal, biomass, garbage and sludge, the pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant utilizes the heat released by cooling the pyrolysis gas to heat the cooling medium in the heat exchange device, the cooling medium heated by the pyrolysis gas can be air and/or water, the hot air can be sent into the power station boiler to assist the combustion of coal in the furnace, the consumption of the energy of the hot air is saved, the hot water can be sent into a boiler water supply pipeline or a deaerator water supply pipeline or a heat network circulating water supply pipeline, the energy consumption of cold water heating in a water supply system or a condensate water system or a heat network circulating water system is reduced, and the heat released by cooling the pyrolysis gas is fully utilized.
Further, the heat exchange device is an air-cooled heat exchanger, and the cooling medium circulating inside the air-cooled heat exchanger is primary air or secondary air in a cold state of the power station boiler.
The pyrolysis gas cooling, purifying and separating device is used for heating part of primary air or secondary air, so that the heat consumption of preheating the primary air or the secondary air by the air preheater in the boiler of the power station is reduced.
Furthermore, the air supply system is connected with the air preheater and the air-cooled heat exchanger, at least one flow dividing device and at least one flow converging device are arranged in the air supply system, and the flow in each air channel can be controlled by the flow dividing device and the flow converging device.
The air supply system is characterized in that a part of air sent by the air supply system enters an air preheater inside the power station boiler to be preheated, a part of air enters the pyrolysis gas cooling and purifying and separating device to carry out heat exchange, the air after being cooled is converged and then enters the power station boiler or the powder making system, and meanwhile, the arrangement of the adjustable flow dividing device and the adjustable flow converging device can control the air volume entering the air preheater and the pyrolysis gas cooling system to enable the pyrolysis gas cooling system to be in a heat exchange balance state.
Furthermore, cold primary air is introduced into an inlet of the flow dividing device, an outlet of the flow dividing device is connected with a cold air pipeline of the air preheater and the air-cooled heat exchanger, an inlet of the flow converging device is connected with a hot air pipeline of the air preheater and the air-cooled heat exchanger, an outlet of the flow converging device is connected with a powder making system, and an outlet of the powder making system is connected with a burner of the power station boiler.
The utility model discloses a pulverized coal gasification device, including the flow converging device, the flow converging device is used for converging pulverized coal in the pulverized coal gasification device, the primary air gets into the diverging device after, heats in getting into air heater and air-cooled heat exchanger from its export, and the primary air after the heating gets into the powder process system after converging the device, carries the pulverized coal in the powder process system into the combustor of utility boiler, and hot primary air can guarantee that the pulverized coal has possessed certain temperature when getting into utility boiler promptly.
Furthermore, cold secondary air is introduced into an inlet of the flow dividing device, an outlet of the flow dividing device is connected with a cold air pipeline of the air preheater and the air-cooled heat exchanger, an inlet of the flow converging device is connected with a hot air pipeline of the air preheater and the air-cooled heat exchanger, and an outlet of the flow converging device is connected with a burner of the power station boiler.
After the overgrate air gets into diverging device, get into air heater and air-cooled heat exchanger from its export and heat in, the overgrate air after the heating joins the back through converging device and gets into the power plant boiler, the overgrate air that the power plant boiler used is high-temperature wind usually, and its quantity is the biggest, only can consume a large amount of heats in the power plant boiler through air heater heating, influence energy utilization, can show the energy utilization who improves in the power plant boiler through pyrolysis gas cooling purification and separation device heating part overgrate air, in addition, when power plant boiler low load operation of thermal power plant, can close air heater's air inlet, utilize pyrolysis gas cooling heat to replace the heat that air heater absorbs completely, SCR entry flue gas temperature is more than 310 degrees under maintaining the boiler low load, guarantee SCR system normal operating under the low load.
Furthermore, a water-cooling heat exchanger is arranged in the heat exchange device, and a cooling medium circulating in the water-cooling heat exchanger is any one of boiler feed water, condensed water or heat supply network circulating return water.
The pyrolysis gas cooling, purifying and separating device is used for heating part of boiler feed water or condensed water or heat supply network circulating return water, so that the coal consumption of the power station boiler is reduced, and the circulation efficiency of a steam-water system of a thermal power unit is improved.
Furthermore, a cold water pipeline of the water-cooling heat exchanger is connected with any one of a feed water pipeline, a condensed water supply pipeline and a heat supply network circulating water return pipeline of a power plant boiler, a hot water pipeline of the water-cooling heat exchanger is connected with any one of a feed water pipeline, a deaerator supply pipeline and a heat supply network circulating water supply pipeline of the power plant boiler, and a control valve is arranged in the steam-water system to control the inlet, outlet and flow of a cooling medium.
And meanwhile, the setting of the adjustable control valve can control the water quantity entering the pyrolysis gas cooling system, so that the pyrolysis gas cooling system is in a heat exchange balance state.
Further, the air-cooled heat exchanger or the water-cooled heat exchanger is a surface type interval heat exchange coil, and the coil is any one of a light pipe, an inner ribbed pipe, an outer ribbed pipe or a heat exchange pipe with fins inside and outside.
Furthermore, an airflow control valve is arranged on a pyrolysis gas pipeline at the outlet of the pyrolysis furnace, and can control to send one part of pyrolysis gas into the pyrolysis gas cooling, purifying and separating device and directly send the other part of pyrolysis gas into the power station boiler.
A part of pyrolysis gas is directly sent into the power station boiler and can become the direct energy of power station boiler, reduces other fuel consumption, and the pyrolysis gas of hot attitude need not to preheat simultaneously, can save a large amount of energy, and wherein the flue gas accessible power station boiler's flue gas processing apparatus carries out innocent treatment, has practiced thrift partial equipment input.
Further, the combustible gas obtained by purification and separation of the pyrolysis gas cooling, purification and separation device is subjected to subsequent treatment or introduced into a power station boiler, waste gas generated by the pyrolysis furnace or the pyrolysis gas cooling, purification and separation device is sent into the power station boiler, and waste residues and waste liquid generated by the pyrolysis furnace or the pyrolysis gas cooling, purification and separation device are sent into a thermal power plant treatment facility.
The combustible gas that pyrolysis gas cooling purification separator purification separation obtained lets in power plant boiler combustor and can be used to combustion-supporting, saves hot-blast quantity, reduces energy consumption, the waste gas that pyrolysis furnace or pyrolysis gas cooling purification separator produced is sent into power plant boiler and can be utilized its flue gas processing apparatus and carry out innocent treatment, waste residue, the waste liquid that pyrolysis furnace or pyrolysis gas cooling purification separator produced can be sent into thermal power plant's processing facility and carry out innocent treatment.
Compared with the prior art, the utility model has the advantages of as follows:
1. cold state air and/or water in a production system of a thermal power plant are/is used for cooling hot state pyrolysis gas, so that a pyrolysis gas cooling process of interval heat exchange is realized, wherein the cold state air is primary air or secondary air;
2. the heat recovered by cooling the pyrolysis gas is used for heating cold air and/or water in the production system, so that the energy consumption in the process of air blowing and/or water preheating in the original system is reduced, and the production efficiency is improved;
3. when the boiler of the thermal power plant and power station operates at low load, the pyrolysis gas cooling heat can be used for replacing an air preheater to absorb heat, the flue gas temperature of an SCR inlet under the low load of the boiler is maintained to be above 310 ℃, and the normal operation of the SCR system under the low load is ensured.
Drawings
FIG. 1 is a schematic view of a pyrolysis gas cooling system of a pyrolysis furnace of a thermal power plant according to embodiment 1 of the present application;
FIG. 2 is a schematic view of an air-cooled pyrolysis gas cooling and heat exchange system in example 2 of the present application;
FIG. 3 is a schematic view of the primary air heated alone in accordance with embodiment 3 of the present application;
FIG. 4 is a schematic view of the heated overfire air alone of example 4 of the present application;
FIG. 5 is a schematic view of cooling heat exchange of water-cooled pyrolysis gas of example 5 of the present application.
Description of reference numerals:
1. a utility boiler; 2. an air supply system; 201. a flow divider; 202. a confluence device; 3. a steam turbine; 4. a steam-water system; 401. a control valve; 5. a pyrolysis furnace; 501. an airflow control valve; 6. a pyrolysis gas cooling, purifying and separating device; 7. a heat exchange device; 701. an air-cooled heat exchanger; 702. a water-cooled heat exchanger; 8. an air preheater; 9. a pulverizing system; 10. utility boiler burners.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same reference numerals are given to the same structural or functional components, and redundant description thereof is omitted. The described embodiments are merely illustrative of the inventive concept and do not limit the scope of the invention. Embodiments of the present application will be described in detail below with reference to the drawings.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be considered limiting of the scope of the present application.
The pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant according to the embodiment of the present invention is specifically described below with reference to the accompanying drawings.
Example 1
The embodiment provides a pyrolysis gas cooling system of a pyrolysis furnace of a thermal power plant, as shown in fig. 1, the pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant comprises a power station boiler 1, an air supply system 2 of the power station boiler, a steam turbine 3, a steam-water system 4 of the steam turbine, a pyrolysis furnace 5 and a pyrolysis gas cooling, purifying and separating device 6 of the pyrolysis furnace, wherein a heat exchange device 7 is arranged in the pyrolysis gas cooling, purifying and separating device 6, and the heat exchange device 7 comprises an air-cooled heat exchanger 701 and a water-cooled heat exchanger 702.
The water-cooled heat exchanger 702 is connected with any one of a thermal power plant feed water or condensed water supply pipeline or a heat supply network circulating water return pipeline through a cold water pipeline, a hot water pipeline of the water-cooled heat exchanger 702 is connected with any one of a thermal power plant boiler or a deaerator feed water pipeline or a heat supply network circulating water supply pipeline, and a control valve 401 capable of adjusting flow is arranged at the joint of the water-cooled heat exchanger 702 and a water channel and used for adjusting water flow in each pipeline.
The air-cooled heat exchanger 701 and the water-cooled heat exchanger 702 heat air and water inside the pyrolysis gas cooling process through heat released in the pyrolysis gas cooling process, the heated air and water are input into a production system of a thermal power plant, hot air can be sent into the power boiler 1 to assist combustion of coal in the boiler, energy consumption of the hot air is saved, hot water can be sent into a boiler water supply pipeline or a deaerator water supply pipeline or a heat supply network circulating water supply pipeline, energy consumption of cold water heating in a water supply system or a condensate system or a heat supply network circulating water system is reduced, and heat released by pyrolysis gas cooling is fully utilized.
In the system, the raw materials decomposed by the pyrolysis furnace 5 can be any one or more of raw coal, biomass, garbage and sludge, pyrolysis gas generated by heating and decomposing the pyrolysis furnace 5 is discharged into a pyrolysis gas cooling, purifying and separating device 6, tar and combustible gas can be generated after cooling, and the combustible gas is introduced into a hot air pipeline of an air supply system 2 and finally enters a power station boiler 1 for combustion supporting; the waste gas that pyrolysis oven 5 or pyrolysis gas cooling purification separator 6 produced sends into power boiler 1 and can utilize its flue gas processing apparatus to carry out innocent treatment, waste residue, the waste liquid that pyrolysis oven 5 or pyrolysis gas cooling purification separator 6 produced can send into thermal power plant's treatment facility and carry out innocent treatment.
The air supply system 2 sends cold air, after the cold air passes through the flow dividing device 201, a part of the cold air enters the air preheater 8 arranged in the power station boiler 1 to be preheated, a part of the cold air enters the pyrolysis gas cooling, purifying and separating device 6, the cold air is heated by pyrolysis gas in the pyrolysis gas cooling, purifying and separating device 6 through the air-cooled heat exchanger 701, and hot air heated by the air preheater 8 and the air-cooled heat exchanger 701 is converged through the converging device 202 to enter a hot air pipeline of the air supply system 2. The primary air can be fed into the air supply system 2, the outlet of a hot air pipeline of the air supply system 2 is connected with a powder making system 9, the outlet of the powder making system 9 is connected with a power station boiler burner 10, the heated primary air carries pulverized coal produced in the powder making system 9 to enter the power station boiler burner 10, and the hot primary air can ensure that the pulverized coal has a certain temperature when entering the power station boiler 1, so that the pulverized coal can be conveniently and fully combusted, and the energy utilization rate is improved; the what send into in air supply system 2 also can be the overgrate air, this moment air supply system 2's hot-blast main lug connection power plant boiler combustor 10, the overgrate air that power plant boiler 1 used is high-temperature wind usually, and its quantity is the biggest, only can consume a large amount of heats in power plant boiler 1 through air heater 8 heating, influence energy utilization, can show the energy utilization who improves in power plant boiler 1 through pyrolysis gas cooling purification and separation device 6 heating part overgrate air, in addition, when power plant boiler 1 low-load operation of thermal power plant, can close air heater 8's air inlet, utilize pyrolysis gas cooling heat to replace the heat that air heater 8 absorbs completely, SCR entry flue gas temperature is more than 310 ℃ under maintaining the boiler low-load, guarantee SCR system normal operating under the low load.
The water-cooled heat exchanger 702 can be connected with a water supply system of a thermal power plant, the supplied water which is pressurized by a water supply pump and is discharged from the deaerator is sent to a cold water pipeline of the water-cooled heat exchanger 702 of the pyrolysis gas cooling, purifying and separating device 6, a hot water pipeline of the pyrolysis gas cooling, purifying and separating device 6 is connected to the power station boiler 1, the pyrolysis gas in the pyrolysis gas cooling, purifying and separating device 6 is used for heating the supplied water, and the supplied water is input into the power station boiler 1 after the supplied water meets the temperature requirement of the accumulated water in the; the water-cooled heat exchanger 702 can also be connected with a condensate system, condensate water which is discharged from a condenser and pressurized by a condensate pump is sent to a cold water pipeline of the water-cooled heat exchanger 702 of the pyrolysis gas cooling and purifying separation device 6, a hot water pipeline of the water-cooled heat exchanger 702 is connected with a deaerator, the condensate water is heated by utilizing the cooling heat of the pyrolysis gas, and the condensate water is pumped into the deaerator after meeting the temperature requirement; the water-cooled heat exchanger 702 can also be connected with a heat supply network circulating system of a heat supply network, return water of the heat supply network returned from the heat supply network is sent to a cold water pipeline of the water-cooled heat exchanger 702 of the pyrolysis gas cooling and purifying and separating device 6, a hot water pipeline of the water-cooled heat exchanger 702 is connected with the heat supply network, the heat supply network circulating water is heated by utilizing the pyrolysis gas cooling heat, and the heated heat supply network circulating water meeting the temperature requirement is pumped into the heat supply network; the cold water in the water channel is heated by the heat released by cooling the pyrolysis gas, so that the energy consumption for heating the water channel is reduced, and meanwhile, the arrangement of the adjustable control valve 401 can control the water amount entering the pyrolysis gas cooling system, so that the pyrolysis gas cooling system is in a heat exchange balance state.
Example 2
The embodiment provides a pyrolysis gas cooling system of a pyrolysis furnace of a thermal power plant, the pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant comprises a power station boiler 1, an air supply system 2 of the power station boiler, a steam turbine 3, a steam-water system 4 of the steam turbine, and further comprises a pyrolysis furnace 5 and a pyrolysis gas cooling, purifying and separating device 6 of the pyrolysis furnace, a heat exchange device 7 is arranged in the pyrolysis gas cooling, purifying and separating device 6, and the heat exchange device 7 comprises an air-cooled heat exchanger 701.
As shown in fig. 2, compared with embodiment 1, this embodiment only includes an air-cooled heat exchanger 701, after cold air sent by the air supply system 2 passes through the flow dividing device 201, a part of the cold air enters the air preheater 8 disposed in the utility boiler 1 to be preheated, a part of the cold air enters the pyrolysis gas cooling, purifying and separating device 6, the cold air is heated by pyrolysis gas in the pyrolysis gas cooling, purifying and separating device 6 through the air-cooled heat exchanger 701, hot air heated by the air preheater 8 and the air-cooled heat exchanger 701 is merged into a hot air duct of the air supply system 2 through the merging device 202, and the merged hot air is finally sent into the utility boiler combustor 10, so that energy consumption of cold air in the preheating part of the utility boiler 1 is saved.
Example 3
The embodiment provides a pyrolysis gas cooling system of a pyrolysis furnace of a thermal power plant, the pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant comprises a power station boiler 1, an air supply system 2 of the power station boiler, a steam turbine 3, a steam-water system 4 of the steam turbine, and further comprises a pyrolysis furnace 5 and a pyrolysis gas cooling, purifying and separating device 6 of the pyrolysis furnace, a heat exchange device 7 is arranged in the pyrolysis gas cooling, purifying and separating device 6, and the heat exchange device 7 comprises an air-cooled heat exchanger 701.
As shown in fig. 3, the air supply system 2 sends cold primary air, after the cold primary air passes through the flow dividing device 201, a part of the cold primary air enters the air preheater 8 arranged in the utility boiler 1 for preheating, and a part of the cold primary air enters the pyrolysis gas cooling, purifying and separating device 6, is heated by the pyrolysis gas in the pyrolysis gas cooling, purifying and separating device 6 through the air-cooled heat exchanger 701, and the hot primary air heated by the air preheater 8 and the air-cooled heat exchanger 701 is converged into the hot air duct of the air supply system 2 through the flow converging device 202. The hot-blast pipeline lug connection power plant boiler combustor 10 of air supply system 2, because the overgrate air that power plant boiler 1 used is high-temperature wind usually, and its quantity is the biggest, only can consume a large amount of heats in power plant boiler 1 through the heating of air heater 8, influence energy utilization, can show the energy utilization who improves in power plant boiler 1 through pyrolysis gas cooling purification separator 6 heating part overgrate air, in addition, when power plant boiler 1 low-load operation of thermal power plant, can close air heater 8's air inlet, the heat that utilizes pyrolysis gas cooling heat to replace air heater 8 to absorb completely, SCR entry flue gas temperature is more than 310 degrees under maintaining the boiler low-load, guarantee the normal operating under the SCR system low-load.
Example 4
The embodiment provides a pyrolysis gas cooling system of a pyrolysis furnace of a thermal power plant, the pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant comprises a power station boiler 1, an air supply system 2 of the power station boiler, a steam turbine 3, a steam-water system 4 of the steam turbine, and further comprises a pyrolysis furnace 5 and a pyrolysis gas cooling, purifying and separating device 6 of the pyrolysis furnace, a heat exchange device 7 is arranged in the pyrolysis gas cooling, purifying and separating device 6, and the heat exchange device 7 comprises an air-cooled heat exchanger 701.
As shown in fig. 4, the air supply system 2 sends cold secondary air, after the cold secondary air passes through the flow dividing device 201, a part of the cold secondary air enters the air preheater 8 arranged in the utility boiler 1 for preheating, a part of the cold secondary air enters the pyrolysis gas cooling, purifying and separating device 6, the cold secondary air is heated by the pyrolysis gas in the pyrolysis gas cooling, purifying and separating device 6 through the air-cooled heat exchanger 701, and the hot secondary air heated by the air preheater 8 and the air-cooled heat exchanger 701 is converged into the hot air duct of the air supply system 2 through the flow converging device 202. The hot-blast pipeline lug connection power plant boiler combustor 10 of air supply system 2, because the overgrate air that power plant boiler 1 used is high-temperature wind usually, and its quantity is the biggest, only can consume a large amount of heats in power plant boiler 1 through the heating of air heater 8, influence energy utilization, can show the energy utilization who improves in power plant boiler 1 through pyrolysis gas cooling purification separator 6 heating part overgrate air, in addition, when power plant boiler 1 low-load operation of thermal power plant, can close air heater 8's air inlet, the heat that utilizes pyrolysis gas cooling heat to replace air heater 8 to absorb completely, SCR entry flue gas temperature is more than 310 degrees under maintaining the boiler low-load, guarantee the normal operating under the SCR system low-load.
Example 5
This embodiment provides a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, pyrolysis furnace pyrolysis gas cooling system of thermal power plant includes power boiler 1 and air supply system 2, steam turbine 3 and soda system 4 thereof, still includes pyrolysis furnace 5 and pyrolysis gas cooling purification separator 6 thereof, be provided with heat transfer device 7 in the pyrolysis gas cooling purification separator 6, heat transfer device 7 contains water-cooled heat exchanger 702.
As shown in fig. 5, a cold water pipeline of the water-cooling heat exchanger 702 is connected to any one of a water supply pipeline or a condensed water supply pipeline of the power plant boiler 1 or a circulating water return pipeline of a heat supply network, a hot water pipeline of the water-cooling heat exchanger 702 is connected to any one of the power plant boiler 1 or a deaerator water supply pipeline or the circulating water supply pipeline of the heat supply network, and a control valve 401 is arranged in the steam-water system 4 to control the inlet and outlet and flow of a cooling medium. And a part of boiler feed water or condensed water or heat supply network circulating water return water in the steam-water system 4 enters the pyrolysis gas cooling and purifying separation device 6 for heat exchange, the water after being subjected to heat reduction enters the power station boiler 1 or a water supply pipeline of a deaerator or a heat supply network circulating water supply pipeline, the energy consumption for heating the water is reduced, and meanwhile, the arrangement of the adjustable control valve 401 can control the water amount entering the pyrolysis gas cooling system, so that the pyrolysis gas cooling system is in a heat exchange balance state.
Example 6
This embodiment provides a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, pyrolysis furnace pyrolysis gas cooling system of thermal power plant includes power boiler 1 and air supply system 2, steam turbine 3 and soda system 4 thereof, still includes pyrolysis furnace 5 and pyrolysis gas cooling purification separator 6 thereof, be provided with heat transfer device 7 in the pyrolysis gas cooling purification separator 6, heat transfer device 7 contains water-cooled heat exchanger 702.
In this embodiment, the pyrolysis gas cooling heat is used to heat the feed water of the utility boiler 1, the feed water pressurized by the feed water pump from the deaerator is sent to the cold water pipeline of the water-cooled heat exchanger 702 of the pyrolysis gas cooling purification and separation device 6, the feed water is heated by the pyrolysis gas cooling heat, and the heated feed water meeting the boiler feed water temperature requirement is fed into the utility boiler 1.
Example 7
The embodiment provides a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, and the embodiment provides a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, pyrolysis gas cooling system of thermal power plant includes power boiler 1 and air supply system 2, steam turbine 3 and its soda system 4, still includes pyrolysis furnace 5 and pyrolysis gas cooling and purifying separator 6, be provided with heat transfer device 7 among the pyrolysis gas cooling and purifying separator 6, heat transfer device 7 contains water-cooled heat exchanger 702.
In this embodiment, the pyrolysis gas cooling heat is used for heating the condensate of the thermal power generating unit, the condensate which comes out of the condenser and is pressurized by the condensate pump is sent into the cold water pipeline of the water-cooled heat exchanger 702 of the pyrolysis gas cooling and purifying separation device 6, the condensate is heated by the pyrolysis gas cooling heat, and the heated condensate meeting the temperature requirement is pumped into the deaerator.
Example 8
The embodiment provides a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, and the embodiment provides a pyrolysis gas cooling system of pyrolysis furnace of thermal power plant, pyrolysis furnace pyrolysis gas cooling system of thermal power plant includes power boiler 1 and air supply system 2, steam turbine 3 and steam-water system 4 thereof, still includes pyrolysis furnace 5 and pyrolysis gas cooling and purification separator 6 thereof, be provided with heat transfer device 7 in pyrolysis gas cooling and purification separator 6, heat transfer device 7 contains water-cooled heat exchanger 702.
In this embodiment, the pyrolysis gas cooling heat is used to heat the heat supply network circulating water of the heat supply network of the thermal power plant, the return water of the heat supply network returned from the heat supply network is sent into the cold water pipeline of the water-cooled heat exchanger 702 of the pyrolysis gas cooling and purifying and separating device 6, the pyrolysis gas cooling heat is used to heat the heat supply network circulating water, and the heated heat supply network circulating water meeting the temperature requirement is pumped into the heat supply network.
Example 9
The present embodiment provides a pyrolysis gas cooling system for a pyrolysis furnace of a thermal power plant, the structure of which is substantially the same as that of any one of embodiments 1 to 8, and the difference is that an airflow control valve 501 is disposed on a pyrolysis gas pipeline at an outlet of the pyrolysis furnace 5, the airflow control valve 501 can control a part of pyrolysis gas to be sent to a pyrolysis gas cooling, purifying and separating device 6 for cooling, and at the same time, another part of pyrolysis gas can be directly sent to a power station boiler 1, so that the other part of pyrolysis gas directly becomes a heat source of the power station boiler 1, an intermediate link is saved, and energy consumption is reduced, and the airflow control valve 501 can be disposed in any one of embodiments 1 to 8.
The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above only are embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a pyrolysis furnace pyrolysis gas cooling system of thermal power plant, includes power plant boiler (1) and air supply system (2), steam turbine (3) and soda system (4) thereof, its characterized in that still includes pyrolysis furnace (5) and pyrolysis gas cooling purification separator (6) thereof, be provided with heat transfer device (7) in pyrolysis gas cooling purification separator (6), heat transfer device (7) are air-cooled heat exchanger (701) and/or water-cooled heat exchanger (702), cooling medium in air-cooled heat exchanger (701) and/or water-cooled heat exchanger (702) is right pyrolysis gas in pyrolysis gas cooling purification separator (6) cools off, cooling medium that air-cooled heat exchanger (701) export has been heated can be carried into power plant boiler (1) or powder process system (9), cooling medium that water-cooled heat exchanger (702) export has been heated can carry into boiler water supply pipeline or oxygen-eliminating device water supply pipeline or heat supply network circulating water supply In the water line.
2. The pyrolysis gas cooling system of the thermal power plant pyrolysis furnace according to claim 1, wherein the cooling medium circulating in the air-cooled heat exchanger (701) is cold primary air or secondary air of the utility boiler (1).
3. The pyrolysis gas cooling system of the thermal power plant pyrolysis furnace is characterized in that the air supply system (2) is connected with an air preheater (8) and an air-cooled heat exchanger (701), at least one flow dividing device (201) and at least one flow converging device (202) are further arranged in the air supply system (2), and the flow dividing device (201) and the flow converging device (202) can adjust the flow in each air channel.
4. The pyrolysis gas cooling system of the thermal power plant pyrolysis furnace is characterized in that cold primary air is introduced into an inlet of the flow dividing device (201), an outlet of the flow dividing device is connected with a cold air pipeline of the air preheater (8) and the air-cooled heat exchanger (701), an inlet of the flow converging device (202) is connected with a hot air pipeline of the air preheater (8) and the air-cooled heat exchanger (701), an outlet of the flow converging device is connected with the pulverizing system (9), and an outlet of the pulverizing system (9) is connected with the power plant boiler burner (10).
5. The pyrolysis gas cooling system of the thermal power plant pyrolysis furnace is characterized in that cold secondary air is introduced into an inlet of the flow dividing device (201), an outlet of the flow dividing device is connected with a cold air pipeline of the air preheater (8) and the air-cooled heat exchanger (701), an inlet of the flow converging device (202) is connected with a hot air pipeline of the air preheater (8) and the air-cooled heat exchanger (701), and an outlet of the flow converging device is connected with the power plant boiler burner (10).
6. The pyrolysis gas cooling system of the thermal power plant pyrolysis furnace according to claim 1, 4 or 5, wherein a water-cooled heat exchanger (702) is arranged in the heat exchange device (7), and a cooling medium circulating inside the water-cooled heat exchanger (702) is any one of feed water of a power plant boiler, condensed water or return water of a heat supply network.
7. The pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant as claimed in claim 6, wherein a cold water pipeline of the water-cooled heat exchanger (702) is connected with any one of a feed water pipeline or a condensed water feed pipeline of a boiler of the thermal power plant or a return water pipeline of circulating water of a heat supply network, a hot water pipeline of the water-cooled heat exchanger (702) is connected with any one of a feed water pipeline or a deaerator feed water pipeline of a boiler of the thermal power plant or a return water pipeline of circulating water of the heat supply network, and a control valve (401) is arranged in the steam-water system (4) to control the inlet and outlet and flow of a cooling medium.
8. The pyrolysis gas cooling system of the pyrolysis furnace of the thermal power plant as claimed in claim 7, wherein the air-cooled heat exchanger (701) or the water-cooled heat exchanger (702) is a surface type interval heat exchange coil, and the coil is any one of a light pipe, an inner ribbed pipe, an outer ribbed pipe or a heat exchange pipe with ribs on the inner side and the outer side.
9. The system for cooling the pyrolysis gas of the pyrolysis furnace of the heat-engine plant according to claim 8, wherein a gas flow control valve (501) is arranged on a pyrolysis gas pipeline at the outlet of the pyrolysis furnace (5), and the gas flow control valve (501) can control to feed a part of the pyrolysis gas into the pyrolysis gas cooling, purifying and separating device (6) and simultaneously feed another part of the pyrolysis gas into the power station boiler (1) directly.
10. The system for cooling the pyrolysis gas of the pyrolysis furnace of the thermal power plant according to claim 1, wherein the combustible gas obtained by purification and separation of the pyrolysis gas cooling, purification and separation device (6) is subjected to subsequent treatment or is introduced into a burner (10) of a power plant boiler, the waste gas generated by the pyrolysis furnace (5) or the pyrolysis gas cooling, purification and separation device (6) is sent into the power plant boiler (1), and the waste slag and the waste liquid generated by the pyrolysis furnace (5) or the pyrolysis gas cooling, purification and separation device (6) are sent into a treatment facility of the thermal power plant.
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| CN117299740B (en) * | 2023-11-30 | 2024-02-06 | 光大环保技术装备（常州）有限公司 | Waste battery recycling system and control method |
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