CN211650275U - Waste heat recovery coupling sludge blending combustion system suitable for coal-fired power plant - Google Patents
Waste heat recovery coupling sludge blending combustion system suitable for coal-fired power plant Download PDFInfo
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- CN211650275U CN211650275U CN202021165668.9U CN202021165668U CN211650275U CN 211650275 U CN211650275 U CN 211650275U CN 202021165668 U CN202021165668 U CN 202021165668U CN 211650275 U CN211650275 U CN 211650275U
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Abstract
The utility model relates to an urban sludge reduction processing system discloses a waste heat recovery coupling mud mixes system of burning suitable for coal fired power plant very much. This waste heat recovery coupling mud mixes system of burning, including the wet sludge bucket pond of splendid attire wet sludge, wet sludge bucket pond intercommunication sludge drying machine, its characterized in that: an outlet of the sludge dryer is communicated with the cyclone separator, an outlet at the bottom of the cyclone separator is communicated with the dry sludge buffer bin, an outlet at the bottom of the dry sludge buffer bin is communicated with the boiler coal feeder system, and an outlet at the top end of the cyclone separator is communicated with an inlet flue of an electric dust collector of a power plant; an air inlet of the sludge dryer is communicated with a steam-gas mixer, a bottom flue gas inlet of the steam-gas mixer is communicated with a high-temperature flue between an outlet of the SCR denitration device and an inlet of the air preheater, and a steam inlet of the steam-gas mixer is communicated with the fixed-row pipeline system and the continuous-row pipeline system in parallel. The utility model has the advantages of reasonable design, easy operation, economical and practical, energy-concerving and environment-protective is suitable for extensive popularization and application.
Description
Technical Field
The utility model relates to an urban sludge reduction processing system, in particular to waste heat recovery coupling mud mixes system of burning suitable for coal fired power plant.
Background
Along with the enlargement of the scale of cities and towns in China and the increasing improvement of the living standard of urban residents, the generation amount of domestic sewage is increased year by year, and more sludge is produced by sewage treatment plants. The composition of the sludge is extremely complex, the sludge contains rich combustible organic matters, and also contains toxic and harmful substances such as heavy metals, pathogenic bacteria and the like, the sludge is large in size, easy to rot, unstable and stink, if the sludge is not properly treated in time, secondary pollution in a large range can be caused, and meanwhile, resources are greatly wasted.
The traditional sludge treatment method mainly comprises landfill, sea filling, incineration and agriculture, and the treatment method consumes a large amount of capital, is easy to cause secondary pollution to the environment, cannot effectively control the emission of pollutants, and limits the popularization and application of the traditional technology.
Disclosure of Invention
The utility model discloses a remedy prior art not enough, provide a waste heat recovery coupling mud that is applicable to coal fired power plant of reasonable in design, easy operation, energy-concerving and environment-protective and mix burning system.
The utility model discloses a realize through following technical scheme:
the utility model provides a waste heat recovery coupling mud mixes system of burning suitable for coal fired power plant, includes the wet sludge bucket pond of splendid attire wet sludge, wet sludge bucket pond intercommunication sludge drying machine, its characterized in that: an outlet of the sludge dryer is communicated with the cyclone separator, an outlet at the bottom of the cyclone separator is communicated with the dry sludge buffer bin, an outlet at the bottom of the dry sludge buffer bin is communicated with the boiler coal feeder system, and an outlet at the top end of the cyclone separator is communicated with an inlet flue of an electric dust collector of a power plant; an air inlet of the sludge dryer is communicated with a steam-gas mixer, a bottom flue gas inlet of the steam-gas mixer is communicated with a high-temperature flue between an outlet of the SCR denitration device and an inlet of the air preheater, and a steam inlet of the steam-gas mixer is communicated with the fixed-row pipeline system and the continuous-row pipeline system in parallel.
The utility model discloses a sludge drying processing system and low temperature flue gas waste heat recovery utilize system. The sludge drying treatment system comprises a wet sludge bucket pool, a sludge dryer, a cyclone separator, a dry sludge buffer bin, a steam-gas mixer and the like; the low-temperature flue gas recovery system comprises a flue gas cooler, a water medium type air heater, a circulating pump and the like.
Wet sludge is conveyed from a sludge treatment plant to a coal-fired power plant by a conveying vehicle, discharged into a wet sludge bucket pool and then conveyed into a sludge dryer for mass heat exchange, dried sludge enters a cyclone separator along with air flow, a gas-solid mixture is separated, then the sludge enters a dry sludge buffer bin and then is discharged into a boiler coal feeder system, and finally the sludge and coal as fired are conveyed into a boiler hearth for combustion; the tail gas separated by the cyclone separator is discharged from the top outlet, sent into the inlet flue of the electric dust remover of the power plant, and mixed with the outlet flue gas of the flue gas waste heat recovery device to enter the dust remover for flue gas treatment.
The drying heat medium required by the sludge dryer is formed by mixing high-temperature flue gas between the outlet of the SCR denitration device and the inlet of the air preheater and high-temperature steam flashed by the constant-discharge/continuous-discharge sewage, wherein the flue gas and the steam are fully mixed in a steam-gas mixer, and the temperature of the mixed flue gas is about 330 ℃; the high-temperature flue gas and the steam are fully mixed and then discharged into a sludge dryer to dry wet sludge, and the temperature of the dried gas-solid mixture is not lower than 110 ℃.
The utility model discloses a more excellent technical scheme does:
a flue gas dust remover is arranged on a communicating pipeline between the steam-gas mixer and the high-temperature flue, and a high-temperature flue gas electric adjusting air door is arranged on a communicating pipeline between the flue gas dust remover and the high-temperature flue; the high-temperature flue gas is subjected to pre-dedusting treatment before entering the steam-gas mixer to remove larger-particle dust, so that the scouring abrasion and blockage of the high-temperature flue gas on the steam-gas mixer, a dryer and other system equipment are reduced, the output of the system is reduced, and the service life of the system is prolonged.
Preferably, the flue gas dust remover is a cyclone separation dust remover, a bottom outlet of the flue gas dust remover is communicated with an inlet flue of an electric dust remover of a power plant, and a manual dedusting inserting plate door is arranged on the bottom outlet; the removed large-particle dust is converged into an inlet flue of an electric dust collector of the power plant and enters the dust collector for flue gas treatment.
The high temperature flue gas of extraction air heater entry reduces as sludge dryer heat source, the flue gas flow who flows through air heater, causes air heater export hot air temperature to descend, and boiler efficiency reduces, from this, the utility model discloses add low temperature flue gas waste heat recovery system at power plant's electric dust remover entry flue, utilize low temperature flue gas to preheat air heater's entry cold wind, the corresponding rising of wind temperature of air heater export can mostly offset the boiler efficiency decline problem that the extraction stove cigarette arouses.
A water medium type air heater is installed in the secondary cooling air channel in front of the inlet of the air preheater, a smoke cooler is installed in the flue in front of the inlet of the electric dust remover of the power plant, a water inlet and outlet pipe of the smoke cooler is circularly communicated with a water inlet and outlet pipe of the water medium type air heater, and a circulating pump and a water circulation electric regulating valve are installed on the circulating pipeline; the low-temperature flue gas waste heat recovery system realizes heat transfer through the flue gas cooler and the water medium type air heater. The waste heat recovery system adopts closed circulation, overcomes the resistance in the pipeline system through the circulating pump, and the electric regulating valve is designed at the outlet of the circulating pump, and the air temperature at the outlet of the hydrophily type air heater is regulated by controlling the circulating water flow through the opening of the regulating valve.
Preferably, the smoke cooler and the hydrophily type air heater are both of an H-shaped fin heat exchange tube structure, smoke and air transversely wash the heat exchange tube outside the tube, a heat transfer medium (water) flows inside the tube, the smoke heats water through the smoke cooler, the water temperature rises, and the hot water heats cold air through the hydrophily type air heater, so that the air temperature rise meets the requirement.
The sludge dryer is a key device of a sludge drying treatment system, is a rotary wing type forced fluidization wall scraping type sludge direct heating and drying treatment device, and has the characteristics of good drying effect, low operating cost and the like; wet sludge with the water content lower than 80% is fed from the bottom of one end of the dryer and is thrown upwards under the action of the rotor wing, a heating medium enters the dryer from the upper part of the same end of the sludge feed and is directly contacted with the thrown material, and the material moves forwards under the action of the rotor wing and hot air to realize mass heat exchange; three working cavities of a heating drying section, a constant-speed drying section and a speed-reducing drying section are arranged inside the sludge dryer, the temperature of sludge at the outlet of the sludge dryer is not more than 55 ℃, and the water content is reduced to be below 40%.
The wet sludge bucket pond is characterized in that a wet sludge discharging manual inserting plate door is installed on an outlet at the bottom of the wet sludge bucket pond, a wet sludge feeding screw pump is installed on an outlet pipeline of the wet sludge bucket pond, and wet sludge is sent into a sludge dryer to be subjected to heat exchange.
The high-temperature heating medium introduced into the dryer consists of two paths of media of high-temperature flue gas and high-temperature steam, the high-temperature flue gas extracted from the front inlet flue of the air preheater enters the steam-gas mixer from the bottom, and the sewage water connected from the fixed-discharge/continuous-discharge pipeline system enters the steam-gas mixer from the side along with the pipeline after being decompressed.
The device comprises a steam-gas mixer, a sludge dryer, a steam-gas mixer, a flue gas inlet electric adjusting air door, a flue gas outlet electric adjusting air door, a flue gas inlet electric adjusting air door and a sludge treatment capacity adjusting valve, wherein the steam-gas mixer is provided with a sewage discharge inlet pipeline which is provided with a sewage discharge electric pressure reducing valve, a part of the sewage discharge pipeline inserted into the steam-gas mixer is provided with a plurality of staggered and crossed holes, and the flue gas inlet electric adjusting air door is arranged on a pipeline of the; the low-pressure sewage is sprayed out from the pipe hole and is flashed into high-temperature steam, and the high-temperature steam is fully mixed with high-temperature flue gas flowing from bottom to top, so that the fixed/continuous discharge sewage is fully utilized, the high-temperature flue gas extraction amount is reduced, and the heat loss of the boiler is reduced.
The utility model discloses a wet sludge treatment device, including cyclone separator, power plant's electric dust remover, be provided with the inlet flue of cyclone separator and power plant's electric dust remover, install the draught fan on the intercommunication pipeline between the inlet flue of cyclone separator and power plant's electric dust remover, and be provided with the waste gas branch pipe of parallelly connected intercommunication dry sludge surge bin and wet sludge bucket pond on cyclone separator's the top export, wet sludge bucket pond and the produced waste gas of dry sludge surge bin all insert in the tail gas pipeline by cyclone separator exhaust.
And a bottom outlet of the dry sludge buffer bin is provided with a dry sludge discharging manual inserting plate door, and a communication pipeline of the dry sludge buffer bin and a boiler coal feeder system is provided with a dry sludge spiral discharging machine.
The utility model utilizes the high-temperature flue gas of the boiler of the coal-fired power plant and the sewage of the fixed and continuous discharge to dry the sludge and then convey the sludge to the coal feeding system of the boiler, the sludge and the coal as fired are sent into a hearth for combustion, and simultaneously the low-temperature flue gas waste heat at the inlet of the dust remover is utilized to preheat the air supply, thereby reducing the influence of the high-temperature flue gas extraction on the boiler efficiency and realizing the comprehensive economic benefit; the system has the advantages of reasonable design, simple operation, economy, practicality, energy conservation, environmental protection and suitability for wide popularization and application.
Drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1 wet sludge bucket pool, 2 wet sludge discharging manual inserting plate doors, 3 wet sludge feeding screw pumps, 4 sludge dryers, 5 cyclone separators, 6 dry sludge buffer bins, 7 dry sludge discharging manual inserting plate doors, 8 dry sludge spiral discharging machines, 9 draught fans, 10 high-temperature flue gas electric adjusting air doors, 11 flue gas dust collectors, 12 dust removing manual inserting plate doors, 13 steam-gas mixers, 14 sewage discharging electric pressure reducing valves, 15 flue gas inlet electric adjusting air doors, 16 flue gas coolers, 17 hydrophily type air heaters, 18 circulating pumps, 19 water circulating electric adjusting valves, 20 power plant electric dust collectors and 21 air preheaters.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
The attached drawing is a concrete embodiment of the utility model. The embodiment comprises a wet sludge bucket pool 1 for containing wet sludge, wherein the wet sludge bucket pool 1 is communicated with a sludge dryer 4, an outlet of the sludge dryer 4 is communicated with a cyclone separator 5, an outlet at the bottom of the cyclone separator 5 is communicated with a dry sludge buffer bin 6, an outlet at the bottom of the dry sludge buffer bin 6 is communicated with a boiler coal feeder system, and an outlet at the top end of the cyclone separator 5 is communicated with an inlet flue of an electric dust collector 20 of a power plant; an air inlet of the sludge dryer 4 is communicated with a steam-gas mixer 13, a bottom gas inlet of the steam-gas mixer 13 is communicated with a high-temperature flue between an outlet of the SCR denitration device and an inlet of the air preheater 21, and a steam inlet of the steam-gas mixer 13 is communicated with a fixed-row pipeline system and a continuous-row pipeline system in parallel.
In the utility model, wet sludge of a sludge treatment plant is transported into a coal-fired power plant by a sludge transport vehicle, is discharged into a wet sludge bucket pool 1, is sent into a sludge dryer 4 by a wet sludge feeding screw pump 3 for drying treatment, and a wet sludge discharging manual inserting plate door 2 is arranged below the wet sludge bucket pool 1 for manually opening and closing the discharge of the wet sludge; the high-temperature heating medium in the sludge dryer 4 comes from a steam-gas mixer 13, the system automatically controls the air inflow by adjusting the opening of an electric adjusting air door 15 of a flue gas inlet, and the treatment capacity of wet sludge is adjusted, so that mass heat exchange in the dryer is realized.
The high-temperature heat medium in the steam-gas mixer 13 is respectively taken from high-temperature flue gas (285-; the sewage inlet and outlet pipeline is provided with a sewage discharge electric pressure reducing valve 14 for adjusting the pressure of sewage discharge; high-temperature flue gas extracted from a front inlet flue of an air preheater 21 enters a steam-gas mixer 13 from the bottom, sewage water connected from a fixed discharge/continuous discharge pipeline system is decompressed and then enters the steam-gas mixer 13 along with a pipeline from the side, a part of the sewage water pipeline inserted into the steam-gas mixer 13 is provided with a plurality of staggered and crossed open holes, low-pressure sewage water is sprayed from the open holes of the pipeline to be flashed into high-temperature steam, the high-temperature steam is fully mixed with high-temperature flue gas flowing from bottom to top and then enters a sludge dryer to be dried, and the temperature of a gas-solid mixture after wet sludge is dried is 110 ℃.
High-temperature flue gas extracted from the front of an inlet of an air preheater 21 enters a steam-gas mixer 13 for pre-dedusting treatment to remove larger-particle dust so as to reduce scouring wear and blockage of the high-temperature flue gas on the steam-gas mixer 13, a sludge dryer 4 and other equipment, ensure stable system output and prolong the service life of the equipment, a cyclone separation dedusting device is adopted in a flue gas deduster 11, the removed large-particle dust is connected into an inlet flue of an electric deduster 20 of a power plant and enters the electric deduster 20 of the power plant for flue gas treatment, and a dedusting manual inserting plate door 12 is arranged below the flue gas deduster 11 and used for manually opening and closing the discharge of the separated large-particle dust; dried sludge enters a cyclone separator 5 along with air flow, a gas-solid mixture is separated, the sludge enters a dry sludge buffer bin 6, is discharged into a boiler coal feeder system through a dry sludge spiral discharging machine 8, is fed into a boiler hearth together with coal as fired for combustion, and is opened and closed through a dry sludge discharging manual inserting plate door 7 to output dry sludge; the tail gas separated by the cyclone separator 5 is discharged from the upper part, is sent into an inlet flue of an electric dust collector 20 of the power plant by a draught fan 9, and flows into the electric dust collector 20 of the power plant together with the boiler exhaust gas for flue gas treatment; waste gas generated by the wet sludge bucket pool 1 and the dry sludge buffer bin 6 is connected into a tail gas pipeline discharged by the cyclone separator 5.
A smoke cooler 16 of the low-temperature smoke waste heat recycling system is installed in an inlet flue in front of an electric dust collector 20 of a power plant, a hydrophily type air heater 17 is installed in a secondary cooling air flue in front of an inlet of an air preheater 21, the smoke cooler 16 and the hydrophily type air heater 17 are both in an H-shaped fin heat exchange tube mode, smoke and air transversely wash heat exchange tubes outside the tubes, heat transfer media (water) flow inside the tubes, the smoke heats water through the smoke cooler 16, the water temperature rises, and the cold air is heated by the water through the hydrophily type air heater 17, so that the air temperature meets the requirement. The water flow in the whole system is closed circulation, the resistance in the water pipeline system is overcome by the circulating pump 18, the water flow is controlled by the water circulation electric regulating valve 19 at the outlet of the circulating pump 18 to regulate the air temperature at the outlet of the hydrophily type air heater 17, the water circulation electric regulating valve 19 and the outlet air temperature of the hydrophily type air heater 17 are interlocked and connected into the DCS system, and automatic control is realized.
And the sludge drying treatment system is connected to a DCS system for centralized control. The DCS controls the whole set of drying devices in a linkage mode, and reliable guarantee is provided for safe and stable operation of the system. The DCS controls the sludge inlet amount of the dryer by adjusting the heat input (the introduction amount of high-temperature flue gas) of the dryer, so that the stable drying treatment of the sludge is realized.
After the system is put into operation, the water content of the imported sludge is 80 percent, the water content after drying is 40 percent, and the wet sludge amount can be processed by 300t every day; however, because of the extraction of high-temperature flue gas in front of the air preheater, the flow rate of the flue gas flowing through the air preheater is reduced, so that the air temperature at the outlet of the air preheater is slightly reduced, and the boiler efficiency is reduced; meanwhile, the low-temperature flue gas waste heat recycling system heats cold air at the inlet of the air preheater by using the waste heat of low-temperature flue gas (the temperature of the flue gas is reduced to 90 ℃), the temperature of the inlet air is increased by 40 ℃), the temperature of hot air at the outlet of the air preheater is correspondingly increased by about 5 ℃), the waste heat of tail flue gas is recycled, the efficiency of the boiler is improved, and the problem of reduction of the efficiency of the boiler caused by extracting the boiler smoke can be mostly offset.
The system utilizes the waste heat of the coal-fired power plant to carry out drying and dehydration treatment on the municipal sludge, the sludge after drying and dehydration enters a boiler to be burned for power generation, the sludge generated by a local sewage treatment plant is effectively treated, the pressure of the municipal environment and the land is relieved, the aims of harmless treatment and resource utilization of the municipal sludge are finally realized, and good environmental benefit and social benefit can be generated; the mixed combustion proportion of the sludge is small, after the sludge is mixed and combusted, the influence on the ignition, combustion and burnout characteristics of the coal as fired is small, the stable operation of a boiler unit is not influenced, and meanwhile, the system is coupled with a constant continuous drainage sewage waste heat recovery and low-temperature flue gas waste heat recovery utilization system, so that the influence on the thermal efficiency of the boiler after the whole system is put into operation is small; after the sludge is mixed and burned, the comprehensive utilization of the fly ash is not greatly influenced, and the standard emission of the boiler smoke is not influenced. In conclusion, the sludge co-combustion system is completely feasible in technology and has wide application and popularization values.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned are only embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements 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 waste heat recovery coupling mud mixes system of burning suitable for coal fired power plant, includes wet sludge bucket pond (1) of splendid attire wet sludge, wet sludge bucket pond (1) intercommunication sludge drying machine (4), its characterized in that: an outlet of the sludge dryer (4) is communicated with a cyclone separator (5), an outlet at the bottom of the cyclone separator (5) is communicated with a dry sludge buffer bin (6), an outlet at the bottom of the dry sludge buffer bin (6) is communicated with a boiler coal feeder system, and an outlet at the top end of the cyclone separator (5) is communicated with an inlet flue of an electric dust collector (20) of a power plant; an air inlet of the sludge dryer (4) is communicated with a steam-gas mixer (13), a bottom flue gas inlet of the steam-gas mixer (13) is communicated with a high-temperature flue between an outlet of the SCR denitration device and an inlet of the air preheater (21), and a steam inlet of the steam-gas mixer (13) is communicated with the fixed-row pipeline system and the continuous-row pipeline system in parallel.
2. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: a flue gas dust remover (11) is arranged on a pipeline communicated with the steam-gas mixer (13) and the high-temperature flue, and a high-temperature flue gas electric adjusting air door (10) is arranged on a pipeline communicated with the flue gas dust remover (11) and the high-temperature flue.
3. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: install hydrophily formula fan heater (17) in the secondary cold air duct before air heater (21) entry, install cigarette cooler (16) in the flue before power plant's electric dust remover (20) entry, the business turn over water pipe of cigarette cooler (16) and the business turn over water pipe circulation intercommunication of hydrophily formula fan heater (17), and install circulating pump (18) and hydrologic cycle electrical control valve (19) on the circulating line.
4. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: the sludge drying machine (4) is a rotary wing type forced fluidization wall scraping type sludge direct heating and drying treatment device, and a heating drying section, a constant-speed drying section and a deceleration drying section are arranged in the sludge drying machine (4).
5. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: the wet sludge bucket pool is characterized in that a manual inserting plate door (2) for discharging wet sludge is installed on an outlet pipeline at the bottom of the wet sludge bucket pool (1), and a wet sludge feeding screw pump (3) is installed on an outlet pipeline of the wet sludge bucket pool (1).
6. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: the steam-gas mixer (13) is characterized in that a sewage discharge electric pressure reducing valve (14) is installed on a sewage discharge inlet pipeline, a plurality of staggered and crossed holes are formed in the part of the sewage discharge pipeline inserted into the steam-gas mixer (13), and a flue gas inlet electric adjusting air door (15) is installed on a pipeline of the steam-gas mixer (13) communicated with the sludge dryer (4).
7. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: an induced draft fan (9) is installed on a communicating pipeline between inlet flues of the cyclone separator (5) and the electric dust collector (20) of the power plant, and a waste gas branch pipe which is connected with a dry sludge buffer bin (6) and a wet sludge bucket pool (1) in parallel is arranged at an outlet at the top end of the cyclone separator (5).
8. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 1, characterized in that: and a manual inserting plate door (7) for discharging dry sludge is installed on a bottom outlet pipeline of the dry sludge buffer bin (6), and a dry sludge spiral discharging machine (8) is installed on a communication pipeline of the dry sludge buffer bin (6) and a boiler coal feeder system.
9. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 2, characterized in that: the flue gas dust remover (11) is a cyclone dust remover, a bottom outlet pipeline of the flue gas dust remover (11) is communicated with an inlet flue of an electric dust remover (20) of a power plant, and a manual dedusting inserting plate door (12) is arranged on a bottom outlet.
10. The waste heat recovery coupled sludge co-combustion system suitable for the coal-fired power plant according to claim 3, characterized in that: the smoke cooler (16) and the water medium type air heater (17) are both H-shaped fin heat exchange tube structures.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114688523A (en) * | 2022-03-31 | 2022-07-01 | 福建龙净环保股份有限公司 | Mix coal fired boiler system who burns mud |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688523A (en) * | 2022-03-31 | 2022-07-01 | 福建龙净环保股份有限公司 | Mix coal fired boiler system who burns mud |
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