CN204494453U - A kind of energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke - Google Patents
A kind of energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke Download PDFInfo
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- CN204494453U CN204494453U CN201520095385.4U CN201520095385U CN204494453U CN 204494453 U CN204494453 U CN 204494453U CN 201520095385 U CN201520095385 U CN 201520095385U CN 204494453 U CN204494453 U CN 204494453U
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Abstract
The utility model discloses a kind of energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke, comprise economizer, air preheater, feed-water heater, steam air heater, N level low-pressure heater, one-level gas cooler, secondary smoke cooler, electrostatic precipitator, desulfuration absorbing tower, chimney, one-level high-pressure heater.The thermal power transfer of boiler smoke middle-low grade is high-grade heat energy while to boiler smoke process by the utility model, increases coal conservation.
Description
Technical field
The utility model belongs to station boiler field, relates to a kind of energy-saving and emission-reduction system, is specifically related to a kind of energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke.
Background technology
Coal is the main primary energy of China, and coal fired power generation is occupied an leading position in power generation.This energy resource structure can not change within one quite long from now on period.Under, coal supply intense situation in great demand at current energy source; develop efficient, energy-conservation, Large Copacity, clean environmental protection, generation technology that reliability is high; can not only meet national economy fast-developing to electric power in the urgent need to, and the increasingly serious requirement can tackled from environmental protection aspect and challenge.Along with the whole world is to the raising day by day of environmental protection requirement, China is also more and more higher to the standard of environmental protection.Within 2011, country has promulgated new " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), and enforcement in 2012.Relative to former standard, further increase thermal power plant SO
2, NO
xand the discharge standard of flue dust, reach and be even better than international most advanced level.
Thermal power plant consumes 50% of coal in China total output, and its heat loss due to exhaust gas is one maximum in station boiler various heat losses, and generally 5% ~ 8%, exhaust gas temperature often raises 15 DEG C, and heat loss due to exhaust gas increases by 0.6% ~ 1.0%.In China's active service fired power generating unit, exhaust gas temperature generally maintains 125 ~ 150 DEG C of left and right horizontal, and high fume temperature is a universal phenomenon.The impact of exhaust gas temperature on boiler safety, economy is mainly manifested in the following aspects:
1) exhaust gas temperature raises, and exhaust gas volumn is increased, thus reduces the specific dust collection area of electric cleaner, shortens the time of staying of fly ash granule in electric precipitation, affects the sedimentation of flying dust, reduces the efficiency of electric cleaner.
2) exhaust gas temperature raises, and fly ash resistivity will rise to 10
11more than (Ω cm), fly ash resistivity enter be not suitable for electric precipitation work scope in, greatly reduce the efficiency of electric cleaner.
3) exhaust gas temperature raises, and blower fan, deduster working environment are worsened, and shortens the life-span of equipment, adds accident rate, affect unit safety.
4) for wet desulfurization system, exhaust gas temperature is too high will make the water consumption of desulphurization system strengthen, the water resource that waste is precious.
At present, the mainstream technology of deeply reducing exhausted smoke temperature is low low-level (stack-gas) economizer, before it is arranged on deduster, exhaust gas temperature is reduced to below acid dew point, improve efficiency of dust collection, reduce wet desulfuration tower water consumption, the heat reclaimed is used for heat-setting water, and exclusion low-pressure heater draws gas, and reduces gross coal consumption rate.But its heat grade reclaimed is lower, can only be used for squeezing low-grade drawing gas, energy-saving effect is limited; Drawing gas of simultaneously squeezing can cause condenser vacuum slightly to raise, and adds gross coal consumption rate, and natively limited energy-saving effect is compressed further.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, provide a kind of energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke, the thermal power transfer of boiler smoke middle-low grade is high-grade heat energy while to boiler smoke process by this system, reduce the vacuum rising that low-level (stack-gas) economizer causes, increase coal conservation.
For achieving the above object, the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke described in the utility model comprises economizer, air preheater, feed-water heater, steam air heater, N level low-pressure heater, one-level gas cooler, secondary smoke cooler, electrostatic precipitator, desulfuration absorbing tower, chimney, one-level high-pressure heater;
The smoke inlet of described economizer is connected with the exhanst gas outlet of boiler, the exhanst gas outlet of economizer is connected with the smoke inlet of feed-water heater, the exhanst gas outlet of feed-water heater is connected with the smoke inlet of air preheater, the exhanst gas outlet of air preheater is connected with the smoke inlet of one-level gas cooler, the exhanst gas outlet of one-level gas cooler is connected with the smoke inlet of secondary smoke cooler, the exhanst gas outlet of secondary smoke cooler is connected with chimney through electrostatic precipitator and desulfuration absorbing tower successively, the air outlet of steam air heater is connected with the air intake vent of air preheater,
The described feedwater piping of one-level high-pressure heater is connected with the feed-water intake of feed-water heater, the feedwater outlet of feed-water heater is connected with the feed-water intake of economizer, the hot water outlet of secondary smoke cooler is connected with the hot water inlet of steam air heater, the cooling water outlet of steam air heater is connected by the cold water inlet of booster pump with secondary smoke cooler, the condensate water entrance of one-level gas cooler is connected with the condensate water entrance of N level low-pressure heater, and the condensate water outlet of one-level gas cooler exports with the condensate water of N level low-pressure heater and is connected.
Also comprise pressure fan, the air outlet of pressure fan is connected with the air intake vent of steam air heater.
Described electrostatic precipitator is connected by air-introduced machine with between desulfuration absorbing tower.
Also comprise the first controller, for detecting the first temperature sensor of feed-water heater smoke outlet flue-gas temperature and detecting the second temperature sensor of air preheater air outlet place hot blast temperature, be connected by the first valve between the feedwater piping of one-level high-pressure heater and the water inlet of economizer, the output of the first temperature sensor and the output of the second temperature sensor are all connected with the input of the first controller, and the output of the first controller is connected with the control end of the first valve.
Also comprise second controller, second valve, 3rd valve, for detecting the three-temperature sensor of the water temperature of one-level gas cooler condensate water entrance and the 4th temperature sensor for detecting one-level gas cooler smoke outlet flue-gas temperature, the condensate water outlet of N level low-pressure heater to be exported with the condensate water of one-level gas cooler by the second valve and is connected, be connected by the 3rd valve between the condensate water entrance of one-level gas cooler and condensate water outlet, the output of three-temperature sensor and the output of the 4th temperature sensor are all connected with the input of second controller, the output of second controller is connected with the control end of the control end of the second valve and the 3rd valve.
The utility model has following beneficial effect:
Energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke described in the utility model is carried out in processing procedure at the flue gas produced boiler, by part of smoke waste heat in secondary smoke cooler recovered flue gas, then the heat of recovery is utilized to enter into the cold wind of air preheater by steam air heater heating, make the cold wind temperature increase entered in air preheater, when air preheater exchange capability of heat and air preheater outlet hot blast temperature constant, its inlet flue gas temperature can suitably reduce.The flue-gas temperature that feed-water heater utilizes air preheater entrance to reduce is to heat the feedwater of one-level high-pressure heater outlet, this process is, by secondary smoke cooler and steam air heater, air preheater is exported the high-grade heat energy that low-grade fume afterheat is replaced as air preheater entrance, by feed-water heater, high-grade heat energy is passed to feedwater, strengthen coal conservation, reduce the ratio resistance of flying dust in flue gas simultaneously, reduce the flow of flue gas, improve the efficiency of electrostatic precipitator, reduce the water consumption of desulfuration absorbing tower, be conducive to the energy-saving and emission-reduction of unit.Because the air themperature entering air preheater raises, the exhaust gas temperature also corresponding rising of air preheater outlet, now by one-level gas cooler, Mist heat recovering, condensate water in heating N level low-pressure heater, exclusion low-pressure pumping steam, reduces the gross coal consumption rate of unit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1 be boiler, 2 be economizer, 3 be air preheater, 4 be feed-water heater, 5 be one-level gas cooler, 6 be steam air heater, 7 be secondary smoke cooler, 8 be electrostatic precipitator, 9 be air-introduced machine, 10 be desulfuration absorbing tower, 11 be chimney, 12 be booster pump, 13 be pressure fan, 14 be N level low-pressure heater, 15 for one-level high-pressure heater.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to figure 1, the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke described in the utility model comprises economizer 2, air preheater 3, feed-water heater 4, steam air heater 6, N level low-pressure heater 14, one-level gas cooler 5, secondary smoke cooler 7, electrostatic precipitator 8, desulfuration absorbing tower 10, chimney 11, one-level high-pressure heater 15, the smoke inlet of described economizer 2 is connected with the exhanst gas outlet of boiler 1, the exhanst gas outlet of economizer 2 is connected with the smoke inlet of feed-water heater 4, the exhanst gas outlet of feed-water heater 4 is connected with the smoke inlet of air preheater 3, the exhanst gas outlet of air preheater 3 is connected with the smoke inlet of one-level gas cooler 5, the exhanst gas outlet of one-level gas cooler 5 is connected with the smoke inlet of secondary smoke cooler 7, the exhanst gas outlet of secondary smoke cooler 7 is connected with chimney 11 through electrostatic precipitator 8 and desulfuration absorbing tower 10 successively, the air outlet of steam air heater 6 is connected with the air intake vent of air preheater 3, the feedwater piping of described one-level high-pressure heater 15 is connected with the feed-water intake of feed-water heater 4, the feedwater outlet of feed-water heater 4 is connected with the feed-water intake of economizer 2, the hot water outlet of secondary smoke cooler 7 is connected with the hot water inlet of steam air heater 6, the cooling water outlet of steam air heater 6 is connected by the cold water inlet of booster pump 12 with secondary smoke cooler 7, the condensate water entrance of one-level gas cooler 5 is connected with the condensate water entrance of N level low-pressure heater 14, the condensate water outlet of one-level gas cooler 5 exports with the condensate water of N level low-pressure heater 14 and is connected.
It should be noted that, the utility model also comprises pressure fan 13, and the air outlet of pressure fan 13 is connected with the air intake vent of steam air heater 6, is connected between electrostatic precipitator 8 with desulfuration absorbing tower 10 by air-introduced machine 9.The utility model also comprises the first controller, for detecting the first temperature sensor of feed-water heater 4 smoke outlet flue-gas temperature and detecting the second temperature sensor of air preheater 3 air outlet place hot blast temperature, be connected by the first valve between the feedwater piping of one-level high-pressure heater 15 and the water inlet of economizer 2, the output of the first temperature sensor and the output of the second temperature sensor are all connected with the input of the first controller, and the output of the first controller is connected with the control end of the first valve.The utility model also comprises second controller, second valve, 3rd valve, for detecting the three-temperature sensor of the water temperature of one-level gas cooler 5 condensate water entrance and the 4th temperature sensor for detecting one-level gas cooler 5 smoke outlet flue-gas temperature, the condensate water outlet of N level low-pressure heater 14 to be exported with the condensate water of one-level gas cooler 5 by the second valve and is connected, be connected by the 3rd valve between the condensate water entrance of one-level gas cooler 5 and condensate water outlet, the output of three-temperature sensor and the output of the 4th temperature sensor are all connected with the input of second controller, the output of second controller is connected with the control end of the control end of the second valve and the 3rd valve.
Specific works process of the present utility model is:
Along flow of flue gas direction, flue gas enters into air preheater 3 by the exhanst gas outlet of boiler 1 through economizer 2 and feed-water heater 4, and then enter in one-level gas cooler 5 and form tail flue gas, tail flue gas enters into secondary smoke cooler 7, condensation flue gas is formed below the acid dew point that flue-gas temperature continues to be reduced to 90 DEG C in secondary smoke cooler 7, sulfuric acid vapor condensation in condensation flue gas becomes acid mist, condense on grey particle, reduce the fly ash resistivity in flue gas, also reduce flue gas flow simultaneously, greatly efficiency of dust collection can be improved after described condensation flue gas enters electrostatic precipitator 8, sulfur trioxide content in flue gas and dust burdening are reduced greatly, and form dedusting flue gas, dedusting flue gas is drawn through air-introduced machine 9 and is discharged by chimney 11 after desulfuration absorbing tower 10 desulfurization subsequently.
On recirculated water direction, the cooling water that booster pump 12 exports is heated as the hot water of about 100 DEG C after secondary smoke cooler 7, and hot water is cooled to the cooling water of about 70 DEG C after entering steam air heater 6, then enter booster pump 12 and complete circulation.The cold air of about 20 DEG C enters steam air heater 6 after pressure fan 13, enters air preheater 3 after being then heated to about 80 DEG C in steam air heater 6, enters in one-level gas cooler 5 after being then heated to form hot blast.Because the air themperature entering air preheater 3 increases about 60 DEG C, the hot blast temperature that air preheater 3 exports will raise, in order to maintaining heat air temperature is constant, the flue-gas temperature of air preheater 3 entrance can suitably reduce on original basis, feed-water heater 4 is exactly the feedwater that the flue-gas temperature that utilizes air preheater 3 entrance to reduce exports to heat one-level high-pressure heater 15, this process is, by secondary smoke cooler 7 and steam air heater 6, air preheater 3 is exported the high-grade heat energy that low-grade fume afterheat is replaced as air preheater 3 entrance, by feed-water heater 4, high-grade heat energy is passed to feedwater, strengthen coal conservation.Arrange bypass between one-level high-pressure heater 15 and economizer 2, the hot blast temperature exported when air preheater 3 is too low, then open the first valve, improves the flue-gas temperature of air preheater 3 entrance, then improves the hot blast temperature that air preheater 3 exports.
Utilize one-level gas cooler 5 to reclaim low-grade flue gas waste heat to heat the condensate water of N level low-pressure heater 14 entrance, exclusion extracted steam from turbine, reduces the gross coal consumption rate of unit further, effectively realizes the energy-saving and cost-reducing of unit.After the air themperature raising of air preheater 3 entrance, the flue-gas temperature also corresponding raising that air preheater 3 exports, the fume afterheat grade that one-level gas cooler 5 reclaims also improves relatively.
Utilize one-level gas cooler 5 and secondary smoke cooler 7 that flue-gas temperature is reduced to below acid dew point, the sulfuric acid vapor in flue gas is made to become acid mist, condense on flying dust, reduce the ratio resistance of flying dust, reduce flue gas flow rate, improve the efficiency of dust collection of electrostatic precipitator 8, make it to meet stricter environmental requirement, flying dust adsorbs a large amount of SO simultaneously
3, substantially increase desulfuration absorbing tower 10 couples of SO
3removal efficiency, effectively can slow down the corrosion of upstream device.One-level gas cooler 5 and secondary smoke cooler 7 reduce the temperature of flue gas, and the exhaust gas volumn that air-introduced machine 9 is processed reduces greatly, save power consumption.The temperature of flue gas reduces simultaneously, water consumption in desulfuration absorbing tower 10 is reduced greatly, has saved precious water resource, saved the spending of power plant.
Three-temperature sensor detects the condensing water temperature of one-level gas cooler 5 condensate water porch in real time, 4th temperature sensor detects the flue-gas temperature that one-level gas cooler 5 exports in real time, when the temperature of described one-level gas cooler 5 condensate water porch condensate water is lower than pre-set threshold value, 3rd controller controls the second valve open, replace the condensate water of a part of one-level gas cooler 5 condensate water outlet, improve the water temperature entering one-level gas cooler 5.When the flue-gas temperature that described one-level gas cooler 5 exports is lower than pre-set threshold value, the 3rd controller regulates the 3rd valve opening, exempts from too much cooling water and enters one-level gas cooler 5, make flue-gas temperature too low, produces corrosion to follow-up equipment.
Claims (5)
1. the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke, it is characterized in that, comprise economizer (2), air preheater (3), feed-water heater (4), steam air heater (6), N level low-pressure heater (14), one-level gas cooler (5), secondary smoke cooler (7), electrostatic precipitator (8), desulfuration absorbing tower (10), chimney (11), one-level high-pressure heater (15);
The smoke inlet of described economizer (2) is connected with the exhanst gas outlet of boiler (1), the exhanst gas outlet of economizer (2) is connected with the smoke inlet of feed-water heater (4), the exhanst gas outlet of feed-water heater (4) is connected with the smoke inlet of air preheater (3), the exhanst gas outlet of air preheater (3) is connected with the smoke inlet of one-level gas cooler (5), the exhanst gas outlet of one-level gas cooler (5) is connected with the smoke inlet of secondary smoke cooler (7), the exhanst gas outlet of secondary smoke cooler (7) is connected with chimney (11) through electrostatic precipitator (8) and desulfuration absorbing tower (10) successively, the air outlet of steam air heater (6) is connected with the air intake vent of air preheater (3),
The feedwater piping of described one-level high-pressure heater (15) is connected with the feed-water intake of feed-water heater (4), the feedwater outlet of feed-water heater (4) is connected with the feed-water intake of economizer (2), the hot water outlet of secondary smoke cooler (7) is connected with the hot water inlet of steam air heater (6), the cooling water outlet of steam air heater (6) is connected by the cold water inlet of booster pump (12) with secondary smoke cooler (7), the condensate water entrance of one-level gas cooler (5) is connected with the condensate water entrance of N level low-pressure heater (14), the condensate water outlet of one-level gas cooler (5) exports with the condensate water of N level low-pressure heater (14) and is connected.
2. the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke according to claim 1, it is characterized in that, also comprise pressure fan (13), the air outlet of pressure fan (13) is connected with the air intake vent of steam air heater (6).
3. the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke according to claim 1, is characterized in that, is connected between described electrostatic precipitator (8) with desulfuration absorbing tower (10) by air-introduced machine (9).
4. the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke according to claim 1, it is characterized in that, also comprise the first controller, for detecting the first temperature sensor of feed-water heater (4) smoke outlet flue-gas temperature and detecting the second temperature sensor of air preheater (3) air outlet place hot blast temperature, be connected by the first valve between the feedwater piping of one-level high-pressure heater (15) and the water inlet of economizer (2), the output of the first temperature sensor and the output of the second temperature sensor are all connected with the input of the first controller, the output of the first controller is connected with the control end of the first valve.
5. the energy-saving and emission-reduction system based on the exhaust heat stepped utilization of coal steam-electric plant smoke according to claim 4, it is characterized in that, also comprise second controller, second valve, 3rd valve, for detecting the three-temperature sensor of the water temperature of one-level gas cooler (5) condensate water entrance and the 4th temperature sensor for detecting one-level gas cooler (5) smoke outlet flue-gas temperature, the condensate water outlet of N level low-pressure heater (14) to be exported with the condensate water of one-level gas cooler (5) by the second valve and is connected, be connected by the 3rd valve between the condensate water entrance of one-level gas cooler (5) and condensate water outlet, the output of three-temperature sensor and the output of the 4th temperature sensor are all connected with the input of second controller, the output of second controller is connected with the control end of the control end of the second valve and the 3rd valve.
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| CN105135468A (en) * | 2015-09-29 | 2015-12-09 | 国网浙江省电力公司电力科学研究院 | Smoke waste heat utilization system |
| CN105712423A (en) * | 2016-03-04 | 2016-06-29 | 华北电力大学 | MED-TVC seawater desalination combination system by means of power station waste heat |
| CN106051805A (en) * | 2016-06-24 | 2016-10-26 | 福建龙净环保股份有限公司 | Waste heat recovery system and method with discharged smoke waste heat as heat source of air heater |
| CN106439782A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Novel combined boiler smoke waste heat recycling system |
| CN106439781A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Combined boiler smoke waste heat recycling system |
| CN106439780A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Novel boiler flue gas waste heat recovery system |
| CN106439896A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Boiler smoke waste heat recycling system |
| CN106678852A (en) * | 2017-02-27 | 2017-05-17 | 北京京诚科林环保科技有限公司 | Gas heating boiler smoke latent heat recycle and treatment system |
| CN106979530A (en) * | 2017-04-26 | 2017-07-25 | 西安西热锅炉环保工程有限公司 | A kind of energy-saving and water-saving system for wet desulfurization system |
| CN108061668A (en) * | 2018-02-10 | 2018-05-22 | 华能国际电力股份有限公司 | A kind of sulphur coal unit fume afterheat utilizes cooperation-removal pilot plant test platform |
| CN112857067A (en) * | 2021-01-14 | 2021-05-28 | 浙江宏纪能源环境科技有限公司 | Low-grade waste heat comprehensive utilization system with high safety and reliability |
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| CN106439782B (en) * | 2015-08-10 | 2019-05-28 | 江苏海德节能科技有限公司 | A kind of composite boiler flue gas waste heat recovery system |
| CN106439782A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Novel combined boiler smoke waste heat recycling system |
| CN106439780B (en) * | 2015-08-10 | 2019-05-28 | 江苏海德节能科技有限公司 | A kind of New-type boiler flue gas waste heat recovery system |
| CN106439780A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Novel boiler flue gas waste heat recovery system |
| CN106439896A (en) * | 2015-08-10 | 2017-02-22 | 江苏海德节能科技有限公司 | Boiler smoke waste heat recycling system |
| CN105135468A (en) * | 2015-09-29 | 2015-12-09 | 国网浙江省电力公司电力科学研究院 | Smoke waste heat utilization system |
| CN105712423B (en) * | 2016-03-04 | 2018-07-31 | 华北电力大学 | Utilize the MED-TVC seawater desalination combined systems of surplus heat of power plant |
| CN105712423A (en) * | 2016-03-04 | 2016-06-29 | 华北电力大学 | MED-TVC seawater desalination combination system by means of power station waste heat |
| CN106051805A (en) * | 2016-06-24 | 2016-10-26 | 福建龙净环保股份有限公司 | Waste heat recovery system and method with discharged smoke waste heat as heat source of air heater |
| CN106051805B (en) * | 2016-06-24 | 2018-12-14 | 福建龙净环保股份有限公司 | A kind of residual neat recovering system and method using smoke discharging residual heat as steam air heater heat source |
| CN106678852A (en) * | 2017-02-27 | 2017-05-17 | 北京京诚科林环保科技有限公司 | Gas heating boiler smoke latent heat recycle and treatment system |
| CN106979530A (en) * | 2017-04-26 | 2017-07-25 | 西安西热锅炉环保工程有限公司 | A kind of energy-saving and water-saving system for wet desulfurization system |
| CN108061668A (en) * | 2018-02-10 | 2018-05-22 | 华能国际电力股份有限公司 | A kind of sulphur coal unit fume afterheat utilizes cooperation-removal pilot plant test platform |
| CN108061668B (en) * | 2018-02-10 | 2023-11-03 | 华能国际电力股份有限公司 | High sulfur coal unit flue gas waste heat utilization is desorption pilot scale test bench in coordination |
| CN112857067A (en) * | 2021-01-14 | 2021-05-28 | 浙江宏纪能源环境科技有限公司 | Low-grade waste heat comprehensive utilization system with high safety and reliability |
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