CN210292927U - Smoke waste heat recovery and white smoke elimination device for thermal power plant - Google Patents
Smoke waste heat recovery and white smoke elimination device for thermal power plant Download PDFInfo
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- CN210292927U CN210292927U CN201920680521.4U CN201920680521U CN210292927U CN 210292927 U CN210292927 U CN 210292927U CN 201920680521 U CN201920680521 U CN 201920680521U CN 210292927 U CN210292927 U CN 210292927U
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Abstract
The utility model discloses a flue gas waste heat recovery of thermal power plant and white cigarette device disappears, including flue gas pipeline, its characterized in that: the flue gas pipeline is sequentially connected with a heat exchange box flue gas heat exchange inlet and a flue gas heat exchange outlet of the superconducting heat exchange exhaust device, a spraying box flue gas de-whitening inlet and a flue gas de-whitening outlet of the de-whitening water heat recovery device, and a flue gas backflow pipe to a chimney for emission. The cooling and whitening of the high-temperature flue gas, the waste heat recovery and the circulation of the purified flue gas are realized through a superconducting heat exchange exhaust device and a water heat recovery device of the de-whitening water which are connected in series by a flue gas pipeline, and the purified flue gas is automatically discharged through the heating of the high-temperature flue gas; the device adopts superconducting liquid to obviously improve the heat exchange efficiency, improves the treatment effect of the flue gas, recovers the heat in the flue gas to a greater extent, completes the traditional complex flue gas whitening and waste heat recycling with extremely low extra electric quantity consumption, has the advantages of good whitening effect, low operation cost and purchase cost, high operation efficiency, relatively small device volume and low maintenance requirement, and is worth widely popularizing and applying.
Description
Technical Field
The utility model relates to an environmental protection equipment field, specifically say and relate to a flue gas waste heat recovery and white smoke abatement device for high temperature flue gas of thermal power plant.
Background
The thermal power is a main power generation mode in China, the thermal power mainly comprises a coal-fired power plant, the coal-fired power plant uses coal to combust to generate steam to drive a power generating set to generate power, heating and industrial and mining enterprises also have a large number of coal-fired boilers, coal energy has the characteristic of high pollution, smoke generated by coal combustion contains a large amount of dust, sulfur and nitrate containing pollutants and the like, so the smoke generated by primary combustion must be subjected to desulfurization, denitrification and dust removal treatment, the temperature of the treated smoke is 120-180 ℃, the smoke also contains a large amount of water vapor generated by combustion, after dust removal, the water vapor is still in a gaseous state at the high temperature of more than 120 ℃, the high-temperature smoke can be rapidly cooled after being discharged into the air, the temperature of the water vapor in the smoke is reduced, and the water vapor is condensed into white mist, also called white smoke, and becomes a scene of continuous discharge on a chimney of the thermal.
No matter in spring, summer, autumn and winter, white smoke emitted from a chimney of a thermal power plant continuously exists, but the temperature is lower in winter, the white smoke is more remarkable, serious visual pollution can be caused, and the environment attractiveness is influenced. On the other hand, the high-temperature flue gas still carries considerable heat and water, and the energy is wasted when the high-temperature flue gas is directly discharged into the atmosphere. The proportion of heat loss of exhaust smoke in the operation of a boiler of a coal-fired power plant in China is large, at present, the energy utilization rate of the heat-fired power plant is low, the heat efficiency of the whole plant is between 35% and 45%, and about 60% of energy is discharged into the environment and is not utilized; and the operating exhaust gas temperature of some thermal power plants is often higher than the design value, and the energy loss is larger. The flue gas discharged after the dust removal of the cloth bag in the thermal power plant is saturated wet flue gas and carries a large amount of water vapor, and the water vapor contains a large amount of latent heat of vaporization. Therefore, the method has important practical significance in recovering heat and water carried by high-temperature flue gas of a power plant so as to be beneficial to realizing energy conservation and emission reduction and eliminating white smoke at the outlet of a chimney.
Aiming at the problems, a method MGGH for eliminating white smoke is proposed in recent years, the MGGH is a hydrophily heat exchanger, a cooling section heat exchanger is generally installed at an inlet of an electric dust collector, a warming section heat exchanger is installed at a desulphurization outlet, and desulfurized smoke is heated by using heat of the smoke in front of the electric dust collector.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the weak point of above-mentioned conventional art, provide a waste heat recovery to the high temperature flue gas of thermal power plant utilizes and the device of white cigarette disappears.
The purpose of the utility model is achieved through the following technical measures:
thermal power plant's flue gas hydrothermal recovery and white cigarette device that disappears, including the flue gas pipeline, its characterized in that: the flue gas pipeline is connected with a superconducting heat exchange exhaust device and a water heat recovery device for dewatering;
the superconductive heat exchange exhaust device comprises a heat exchange box and a superconductive heat exchange exhaust pipe group, the superconductive heat exchange exhaust pipe group is arranged in the heat exchange box, and the heat exchange box is provided with a flue gas heat exchange inlet and a flue gas heat exchange outlet;
the water-white removal heat recovery device comprises a spraying and water-white removal box, a spraying and water-white removal device, a spraying drive and a water-heat recovery box, wherein spray water is contained in the water-heat recovery box, the water-heat recovery box is communicated with the lower part of the spraying and water-white removal box, the spraying and water-white removal device is arranged at the upper part of the spraying and water-white removal box, the spraying drive absorbs the spray water in the water-heat recovery box and sprays and removes white in the spraying and water-white removal box through the spraying and water-white removal device, and the spraying and water-white removal box is provided with a smoke-gas white removal inlet and a smoke-;
the flue gas pipeline is sequentially connected with a flue gas heat exchange inlet of the heat exchange box, a flue gas heat exchange outlet, a flue gas whitening inlet of the spraying box, a flue gas whitening outlet, a superconductive heat exchange exhaust pipe group and is discharged to a chimney.
As a preferred scheme, a waste heat recovery tube group is arranged in the water heat recovery tank and is connected with a water supply pipeline of a hot water boiler. The hydrothermal recovery case carries out the heat exchange through waste heat recovery nest of tubes, sends the heat in the flue gas of retrieving back to the boiler, reduces the boiler energy consumption, and the energy saving improves the benefit.
As a preferred scheme, the waste heat recovery pipe group comprises a plurality of waste heat recovery pipes which are connected in parallel, and high-frequency welding fins are arranged on the outer circumference of the pipe wall of each waste heat recovery pipe in a winding mode.
The temperature of flue gas subjected to desulfurization and denitrification and high-temperature cloth bag dust removal treatment in a thermal power plant is 120-180 ℃, the high-temperature flue gas is rich in water vapor, the high-temperature flue gas enters a heat exchange box along a flue gas pipeline through a flue gas heat exchange inlet, the high-temperature flue gas is subjected to heat exchange with a superconducting heat exchange exhaust pipe group for primary cooling, the temperature of the high-temperature flue gas is reduced to be below 100 ℃, the flue gas subjected to primary cooling enters a spray box through a flue gas whitening inlet, the flue gas is subjected to spray cooling through spray water in the spray box, saturated water vapor in the flue gas is completely condensed and separated out and falls into a hydrothermal recovery box, the temperature of the bleached flue gas is reduced to 25-30 ℃, the flue gas enters a superconducting flue gas heat exchange pipe of the superconducting heat exchange exhaust pipe group through a flue gas heat exchange outlet and a flue gas pipeline flue gas return pipe, the heat of the high-temperature flue gas subjected to high, the exhaust fan does not need to be used for exhausting air separately.
Under the conditions of spraying, cooling, whitening, secondary desulfurization, denitration and dust removal, the generated sulfur and nitrate mixed in the spraying water are treated by a wet method, and the sludge is cleaned at regular time and sent to an industrial garbage treatment plant for treatment.
Meanwhile, the flue gas after primary cooling still has higher temperature, the temperature of the flue gas is reduced after the flue gas is sprayed by spray water in the spray whitening box, water vapor in the flue gas is condensed, mixed with the spray water and releases heat, so that the temperature of the spray water is obviously increased, the spray water falls into the water heat recovery box and then exchanges heat with the waste heat recovery pipe group, and the water in the waste heat recovery pipe group enters the hot water boiler after being heated to be used as production and living hot water supply so as to further utilize the heat energy in the flue gas and fully recycle the heat energy. The air quantity of the flue gas is reduced after heat exchange and dehydration. And the high temperature flue gas after the sack dust removal is handled heats the flue gas that the amount of wind reduces after handling with superconductive heat transfer exhaust apparatus, makes its intensification, density reduce to can rise by oneself, discharges in the chimney to avoid equipment and electric power input such as extra fan, reduce investment and running cost, simplify equipment and reduce the maintenance requirement, the advantage that has simultaneously is: the water and heat are recycled, the emission indexes are reduced by secondary desulfurization, denitration and dust removal, the heating emission is carried out, and the ultralow emission is really realized.
As a preferred scheme, the superconductive heat exchange exhaust pipe group is provided with a flue gas discharge pipe, a superconductive flue gas heat exchange pipe and a flue gas return pipe.
As a preferred scheme, the superconducting flue gas heat exchange tube comprises a sleeve and an inner tube, the inner tube is sleeved in the sleeve, superconducting liquid is filled between the inner tube and the sleeve, and two ends of the inner tube are respectively communicated with a flue gas discharge tube and a flue gas return tube. Superconducting liquid is a superconductive heat transfer and high-efficient heat transfer new technology, adopt phase change material to make as the medium, superconducting liquid has excellent heat conductivity under 30~100 ℃ of phase transition temperature, through filling full superconducting liquid in the combination formula sleeve pipe and making the heat conduction material, can greatly improve the heat exchange efficiency of flue gas, guarantee that the large-traffic flue gas and the water that the power plant produced also can fully heat transfer discharge, solved that traditional heat exchanger needs super large heat transfer area and super large volume heat exchanger problem to the emission of a large amount of flue gases in power plant, the volume of equipment that can significantly reduce, reduce the equipment maintenance cost.
As a preferred scheme, the superconductive heat exchange exhaust pipe set comprises a plurality of groups of superconductive flue gas heat exchange pipes, and the plurality of groups of superconductive flue gas heat exchange pipes are arranged in parallel.
As a preferred scheme, the spraying and whitening device comprises at least one spraying pipe and a plurality of spraying heads, and the spraying driving is a water pump.
Preferably, a full water discharge device is provided in the water heat recovery tank, and the full water discharge device discharges the shower water exceeding a preset water level in the water heat recovery tank to the water heat recovery tank.
As a preferable scheme, the full water discharge device comprises a full water monitoring control device, a drain pipe, a drain valve and a water level sensor, the drain pipe is connected with a pipeline below a preset water level of the water heat recovery tank, the drain valve is arranged on the drain pipe, the water level sensor is arranged in the water heat recovery tank, and the full water monitoring control device receives a signal of the water level sensor and opens the drain valve until the water level is lower than the preset level after the water level exceeds the preset level.
Owing to adopted above-mentioned technical scheme, compare with prior art, the utility model has the advantages that:
the utility model discloses a flue gas hydrothermal recovery and white smoke elimination device of a thermal power plant, which realizes the cooling and whitening, waste heat recovery and purification of high-temperature flue gas through a superconducting heat exchange exhaust device and a white smoke elimination hydrothermal recovery device which are connected in series by a flue gas pipeline, and the high-temperature flue gas is automatically discharged through the high-temperature flue gas conversion and temperature rise; the device adopts superconducting liquid to obviously improve the heat exchange efficiency, improve the treatment effect of the flue gas, recover heat and water in the flue gas to a greater extent, complete traditional complex flue gas whitening and waste heat and water recycling with extremely low extra electric quantity consumption, and has the advantages of good whitening effect, low operation cost and acquisition cost, high operation efficiency, relatively small equipment volume and low maintenance requirement, thereby being worthy of great popularization and application.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a schematic structural diagram of a flue gas water heat recovery and white smoke elimination device of a thermal power plant.
Fig. 2 is a schematic structural view of a superconducting heat exchange exhaust pipe group in the utility model.
Fig. 3 is a schematic structural diagram of a superconducting heat exchange exhaust pipe group in the present invention.
Fig. 4 is a schematic structural diagram of the waste heat recovery pipe group of the present invention.
Detailed Description
Example (b): as shown in attached figure 1, the flue gas water heat recovery and white smoke elimination device of the thermal power plant comprises a flue gas pipeline 1, wherein the flue gas pipeline 1 is connected with a superconducting heat exchange exhaust device 3 and a white water removal heat recovery device 4 from a bag-type dust collector 2;
as shown in fig. 2 and 3, the superconducting heat exchange exhaust device 3 includes a heat exchange box 31 and a superconducting heat exchange exhaust pipe group 32, the superconducting heat exchange exhaust pipe group 32 is disposed in the heat exchange box 31, the heat exchange box 31 is provided with a flue gas heat exchange inlet 311 and a flue gas heat exchange outlet 312, the superconducting heat exchange exhaust pipe group 32 is provided with a flue gas discharge pipe 321, a plurality of superconducting flue gas heat exchange pipes 323 and a flue gas return pipe 322, two ends of the superconducting flue gas heat exchange pipes 323 are respectively connected to the flue gas discharge pipe 321 and the flue gas return pipe 322, and the plurality of superconducting flue gas heat exchange pipes 323 are disposed in;
as shown in fig. 1 and 2, the de-whitening water heat recovery device 4 includes a spraying de-whitening box 42, a spraying de-whitening device 41, a spraying driver 43 and a hydrothermal recovery box 44, the hydrothermal recovery box 44 contains spraying water, the hydrothermal recovery box 44 is communicated with the lower part of the spraying de-whitening box 42, the spraying de-whitening device 41 is arranged at the upper part of the spraying de-whitening box 42, the spraying de-whitening device 41 includes at least one spraying pipe and a plurality of spraying heads, the spraying driver 43 is a water pump, the spraying driver 43 sucks the spraying water in the hydrothermal recovery box 44 to spray de-whiten in the spraying de-whitening box 42 through the spraying de-whitening device 41, and the spraying de-whitening box 42 is provided with a smoke de-whitening inlet 421 and a smoke de-whitening outlet 422;
the flue gas pipeline 1 is sequentially connected with a flue gas heat exchange inlet 311 of the heat exchange box, a flue gas heat exchange outlet 312, a flue gas whitening inlet 421 of the spraying box, a flue gas whitening outlet 422, a flue gas return pipe 321, a superconductive flue gas heat exchange pipe 323, a flue gas discharge pipe 322 and a chimney 5 for discharge.
As shown in fig. 1 and 4, a waste heat recovery pipe group 45 is arranged in the water heat recovery tank 44, the waste heat recovery pipe group 45 comprises a plurality of waste heat recovery pipes 451 connected in parallel, high-frequency welding fins 452 are arranged on the outer circumference of the pipe wall of each waste heat recovery pipe 451 in a surrounding manner, one water inlet end of the waste heat recovery pipe group 45 is connected with a municipal water pipeline, and one water outlet end of the waste heat recovery pipe group 45 is connected with a water supply pipeline of a hot water boiler.
The temperature of flue gas subjected to desulfurization and denitrification and high-temperature cloth bag dust removal treatment in a thermal power plant is 120-180 ℃, the high-temperature flue gas is rich in water vapor, the high-temperature flue gas enters a heat exchange box 31 along a flue gas pipeline 1 through a flue gas heat exchange inlet 311, the temperature of the high-temperature flue gas is primarily reduced to be below 100 ℃, the primarily reduced temperature flue gas enters a spray box 42 through a flue gas whitening inlet 421, the flue gas is sprayed and reduced in temperature by spraying water in the spray box 42, saturated water vapor in the flue gas is completely condensed and separated out, the saturated water vapor is mixed with the spraying water and releases heat and falls into a water heat recovery box 44, the temperature of the whitened flue gas is reduced to 25-30 ℃, the saturated water vapor enters a superconducting flue gas heat exchange tube 323 of the superconducting heat exchange exhaust tube group 32 through a flue gas heat exchange outlet 422 and a flue gas return tube 322, and the low-temperature flue gas absorbs the heat of, the temperature is obviously increased, the exhaust gas temperature is about 40-50 ℃, the heated flue gas can be discharged into the atmosphere through the chimney 5 by the aid of the self-lifting force, and an exhaust fan is not needed to be independently used for exhausting. The smoke temperature is about 40-50 ℃, so that the smoke temperature is close to the atmospheric temperature and no white smoke is generated. The temperature change in summer and winter can adjust the exhaust gas temperature.
Meanwhile, the flue gas after primary cooling still has high temperature, after being sprayed by the spray water in the spray whitening box 42, the water vapor in the flue gas is condensed and mixed with the spray water and releases heat, so that the temperature of the spray water is obviously increased, the spray water falls into the water heat recovery box 44 and then generates heat exchange with the waste heat recovery tube set 45, and the water in the waste heat recovery tube set 45 is heated and then enters the hot water boiler to be used as production and living hot water supply, so that the heat energy in the flue gas is further utilized and fully recycled. The high-temperature flue gas after the bag-type dust removal treatment is used for heating the treated flue gas, so that the temperature of the flue gas is increased, the density of the flue gas is reduced to be capable of rising automatically, and the flue gas is discharged from a chimney 5, thereby avoiding the investment of additional equipment such as a fan and the like and electric power, reducing the investment cost, simplifying the equipment and reducing the maintenance requirement.
As shown in fig. 2 and 3, the superconducting flue gas heat exchange tube 323 comprises a sleeve tube 3232 and an inner tube 3231, the inner tube 3231 is sleeved in the sleeve tube 3232, superconducting liquid 3233 is filled between the inner tube 3231 and the sleeve tube 3232, and two ends of the inner tube 3231 are respectively communicated with a flue gas discharge tube 321 and a flue gas return tube 322. Superconducting liquid 3233 is a new technology of superconducting heat transfer and efficient heat exchange, and is made of a phase-change material as a medium, the superconducting liquid 3233 has excellent heat conductivity at the phase-change temperature of 30-100 ℃, and the superconducting liquid is filled in a combined sleeve to serve as a heat conduction material, so that the heat exchange efficiency of smoke can be greatly improved, the large-flow smoke generated by a power plant can be fully subjected to heat exchange and discharged, the problems that the traditional heat exchanger needs an ultra-large heat exchange area and an ultra-large heat exchanger for the emission of a large amount of smoke of the power plant are solved, the size of equipment can be greatly reduced, and the maintenance cost of the equipment is reduced.
As shown in fig. 1, a full water discharge device is provided in the water heat recovery tank 44, and the full water discharge device discharges the shower water exceeding a predetermined water level in the water heat recovery tank 44 out of the water heat recovery tank 44. The full water discharge device includes a full water monitoring control device, a drain pipe 461, a drain valve 462 and a water level sensor 463, the drain pipe 461 is connected with a pipeline below a preset water level in the heat recovery tank 44, the drain valve 462 is disposed on the drain pipe 461, the water level sensor 463 is disposed in the heat recovery tank 44, the full water monitoring control device receives a signal of the water level sensor 463 and opens the drain valve 462 until the water level is lowered to a preset level after the water level exceeds the preset level. The full water monitor and control device is not shown in the drawings.
Claims (9)
1. Thermal power plant's flue gas waste heat recovery and white cigarette device that disappears, including flue gas pipeline, its characterized in that: the flue gas pipeline is connected with a superconducting heat exchange exhaust device and a water heat recovery device for dewatering;
the superconductive heat exchange exhaust device comprises a heat exchange box and a superconductive heat exchange exhaust pipe group, the superconductive heat exchange exhaust pipe group is arranged in the heat exchange box, and the heat exchange box is provided with a flue gas heat exchange inlet and a flue gas heat exchange outlet;
the water-white removal heat recovery device comprises a spraying and water-white removal box, a spraying and water-white removal device, a spraying drive and a water-heat recovery box, wherein spray water is contained in the water-heat recovery box, the water-heat recovery box is communicated with the lower part of the spraying and water-white removal box, the spraying and water-white removal device is arranged at the upper part of the spraying and water-white removal box, the spraying drive absorbs the spray water in the water-heat recovery box and sprays and removes white in the spraying and water-white removal box through the spraying and water-white removal device, and the spraying and water-white removal box is provided with a smoke-gas white removal inlet and a smoke-;
the flue gas pipeline is sequentially connected with a flue gas heat exchange inlet of the heat exchange box, a flue gas heat exchange outlet, a flue gas whitening inlet of the spraying box, a flue gas whitening outlet, a superconductive heat exchange exhaust pipe group and is discharged to a chimney.
2. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant as claimed in claim 1, wherein: and a waste heat recovery pipe group is arranged in the water heat recovery tank and is connected with a water supply pipeline of the hot water boiler.
3. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant as claimed in claim 2, wherein: the waste heat recovery pipe group comprises a plurality of waste heat recovery pipes connected in parallel, and high-frequency welding fins are wound on the outer ring of the pipe wall of each waste heat recovery pipe.
4. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant as claimed in claim 1, wherein: the superconductive heat exchange exhaust pipe group is provided with a smoke exhaust pipe, a superconductive smoke heat exchange pipe and a smoke return pipe.
5. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant as claimed in claim 4, wherein: the superconductive flue gas heat exchange tube comprises a sleeve and an inner tube, the inner tube is sleeved in the sleeve, superconductive liquid is filled between the inner tube and the sleeve, and two ends of the inner tube are respectively communicated with a flue gas discharge tube and a flue gas return tube.
6. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant as claimed in claim 4, wherein: the superconductive heat exchange exhaust pipe group comprises a plurality of groups of superconductive flue gas heat exchange pipes, and the plurality of groups of superconductive flue gas heat exchange pipes are arranged in parallel.
7. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant as claimed in claim 1, wherein: the spraying and whitening device comprises at least one spraying pipe and a plurality of spraying heads, and the spraying drive is a water pump.
8. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant according to any one of claims 1 to 7, characterized in that: and a full water discharge device is arranged in the water heat recovery tank and discharges the spray water exceeding a preset water level in the water heat recovery tank out of the water heat recovery tank.
9. The flue gas waste heat recovery and white smoke elimination device of the thermal power plant according to claim 8, characterized in that: the full water discharge device comprises a full water monitoring control device, a drain pipe, a drain valve and a water level sensor, the drain pipe is connected with a pipeline of the water heat recovery tank, the drain valve is arranged on the drain pipe, the water level sensor is arranged in the water heat recovery tank, and the full water monitoring control device receives a signal of the water level sensor and opens the drain valve until the water level is lower than a preset level after the water level exceeds the preset level.
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| CN201920680521.4U CN210292927U (en) | 2019-05-14 | 2019-05-14 | Smoke waste heat recovery and white smoke elimination device for thermal power plant |
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| CN201920680521.4U CN210292927U (en) | 2019-05-14 | 2019-05-14 | Smoke waste heat recovery and white smoke elimination device for thermal power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186298A (en) * | 2019-05-14 | 2019-08-30 | 山东萨尔帕环保科技有限公司 | The recycling of coal steam-electric plant smoke waste heat and eliminating white smoke device |
| CN111735099A (en) * | 2020-05-27 | 2020-10-02 | 黑龙江建筑职业技术学院 | Heat slow release method for heating system |
| CN114577053A (en) * | 2022-03-09 | 2022-06-03 | 浙江凯洲机电工程有限公司 | Industrial heat recovery device and system |
-
2019
- 2019-05-14 CN CN201920680521.4U patent/CN210292927U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186298A (en) * | 2019-05-14 | 2019-08-30 | 山东萨尔帕环保科技有限公司 | The recycling of coal steam-electric plant smoke waste heat and eliminating white smoke device |
| CN111735099A (en) * | 2020-05-27 | 2020-10-02 | 黑龙江建筑职业技术学院 | Heat slow release method for heating system |
| CN111735099B (en) * | 2020-05-27 | 2021-06-01 | 黑龙江建筑职业技术学院 | Heat slow release method for heating system |
| CN114577053A (en) * | 2022-03-09 | 2022-06-03 | 浙江凯洲机电工程有限公司 | Industrial heat recovery device and system |
| CN114577053B (en) * | 2022-03-09 | 2023-09-29 | 浙江凯洲机电工程有限公司 | Industrial heat recovery device and system |
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