CN210495698U - Coal-fired power plant boiler flue gas processing apparatus - Google Patents
Coal-fired power plant boiler flue gas processing apparatus Download PDFInfo
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- CN210495698U CN210495698U CN201920689895.2U CN201920689895U CN210495698U CN 210495698 U CN210495698 U CN 210495698U CN 201920689895 U CN201920689895 U CN 201920689895U CN 210495698 U CN210495698 U CN 210495698U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
A coal-fired power plant boiler flue gas treatment device comprises a heat exchange box, a filter box, a water storage box, a first purification box, a second purification box, a heat exchange tube and a connecting box; a flue gas input pipe and a first gas conveying pipe are arranged on the heat exchange box, and a first gas collecting piece and a second gas collecting piece are arranged on two sides in the heat exchange box; a filter assembly is arranged in the filter box; a first connecting piece and filter cloth are horizontally arranged in the first purifying box, and the bottom of the first connecting piece is communicated with a plurality of first spray heads; a second connecting piece is vertically arranged in the first purifying box, and a plurality of second spraying heads are arranged on the second connecting piece; a fan is arranged in the connecting box; the water storage tank is communicated with a water delivery pipeline; the water delivery pipeline is provided with a water pump and is communicated with the first water delivery pipe and the second water delivery pipe; the first water pipe is communicated with the first connecting piece, and the second water pipe is communicated with the second connecting piece; the second gas transmission pipe is communicated with the first purifying box. The utility model discloses retrieve and utilize the heat energy in the flue gas, energy-concerving and environment-protective, purifying effect is splendid, and purification efficiency is high.
Description
Technical Field
The utility model relates to a coal fired power plant boiler flue gas processing apparatus.
Background
The boiler is an energy conversion device, the energy input to the boiler is in the forms of chemical energy, electric energy, heat energy of high-temperature flue gas and the like in fuel, and the steam, high-temperature water or an organic heat carrier with certain heat energy is output outwards through the conversion of the boiler, the hot water or the steam generated in the boiler can directly provide heat energy required for industrial production and people life, and can also be converted into mechanical energy through a steam power device, or the mechanical energy is converted into the electric energy through a generator.
The boiler is in the course of the work, and the flue gas that produces is discharged through the chimney mostly, leads to a large amount of heat energy also discharge thereupon, causes the reduction of boiler efficiency and the waste of the energy to the boiler is in the use, contains harmful substance such as sulphide and smoke and dust in the flue gas that produces mostly, not only harms people's healthy, still can cause the pollution to the environment. Although there is also a coal-fired power plant boiler flue gas treatment technology at present, for example, chinese patent publication No. CN206037091U, published as 03 and 22 in 2017, discloses a coal-fired power plant boiler flue gas waste heat and moisture combined recycling system, the coal-fired power plant boiler flue gas waste heat and moisture combined recycling system does not have a function of purifying flue gas.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem who exists among the background art, the utility model provides a coal fired power plant boiler flue gas processing apparatus can retrieve and utilize the heat energy in the flue gas, and is energy-concerving and environment-protective, and purifying effect is splendid, and purification efficiency is high.
The utility model provides a technical scheme that above-mentioned problem adopted is: the coal-fired power plant boiler flue gas treatment device is characterized by comprising a heat exchange box, a filter box, a water storage box, a first purification box, a second purification box, a heat exchange pipe, a connecting box and a second gas conveying pipe;
the top of the heat exchange box is provided with a water inlet pipe with a valve, the bottom of the heat exchange box is provided with a water outlet pipe with a valve, and the heat exchange box is filled with aqueous solution; a flue gas input pipe and a first gas conveying pipe are arranged on the heat exchange box, and a first gas collecting piece and a second gas collecting piece are arranged on two sides in the heat exchange box; the heat exchange tube is positioned in the heat exchange box, and two ends of the heat exchange tube are respectively communicated with the first air collecting piece and the second air collecting piece; the first gas collecting piece is communicated with the flue gas input pipe, and the second gas collecting piece is communicated with one end of the first gas conveying pipe; the other end of the first gas pipe is communicated with the filter box; a filtering component is arranged in the filtering box and is positioned above the communication part of the first gas pipe and the filtering box;
a first connecting piece and filter cloth are arranged in the first purifying box, the first connecting piece and the filter cloth are both horizontal, and the first connecting piece is positioned above the filter cloth; the first connecting piece is uniformly provided with through holes, a water collecting cavity is arranged in the first connecting piece, the bottom of the first connecting piece is communicated with a plurality of first atomizing heads, and the atomizing direction of the first atomizing heads faces towards the filter cloth; a second connecting piece is vertically arranged in the first purifying box and is positioned below the filter cloth; a water collecting cavity is arranged in the second connecting piece, and a plurality of second spraying heads are arranged on the second connecting piece; the spraying direction of the second spraying head is vertical to the smoke output direction; the bottom of the first purifying box is provided with a drain pipe with a valve;
one side of the connecting box is communicated with the filter box through a connecting pipe, and the other side of the connecting box is communicated with the first purifying box through a connecting pipe; the connecting part of the connecting box and the filter box is positioned above the filter assembly, and the connecting part of the connecting box and the first purifying box is positioned below the second connecting piece; a fan is arranged in the connecting box;
the water storage tank is provided with a water inlet pipe and is communicated with one end of the water delivery pipeline; the water delivery pipeline is provided with a water pump, and the other end of the water delivery pipeline is communicated with the first water delivery pipe and the second water delivery pipe; the first water pipe is communicated with the first connecting piece, and the second water pipe is communicated with the second connecting piece;
one end of the second gas pipe is communicated with the first purifying box, and the communication position of the second gas pipe and the first purifying box is positioned above the first connecting piece; an air extractor is arranged on the second air conveying pipe, and the other end of the second air conveying pipe extends into the second purifying box and is connected with a third connecting piece; the second purifying box is filled with aqueous solution, and the third connecting piece is positioned in the aqueous solution; the third connecting piece is hollow, and through holes are uniformly formed in the bottom of the third connecting piece; the top of the second purifying box is provided with an exhaust pipe.
Preferably, the heat exchange tube is a coiled tube; and/or the heat exchange tubes are arranged in a plurality of groups at equal intervals in the longitudinal direction.
Preferably, the first gas collecting piece and the second gas collecting piece are both vertically arranged rectangular structures.
Preferably, the filter assembly comprises a fixing frame and an activated carbon adsorption layer; the active carbon adsorption layer is positioned in the fixing frame, and through holes are uniformly formed in the fixing frame.
Preferably, the second connecting member has a cylindrical structure.
Preferably, the second spray heads are arranged in a plurality of circles at equal intervals in the vertical direction, and the second spray heads are distributed in an annular array in each circle.
Preferably, the first water pipe is provided with a valve, and the second water pipe is provided with a valve.
Preferably, the third connecting member is a horizontally arranged rectangular structure.
Preferably, the top of the second purifying box is provided with a water inlet pipe with a valve, and the bottom of the second purifying box is provided with a water outlet pipe with a valve.
The method for treating the flue gas of the coal-fired power plant boiler by using the flue gas treatment device of the coal-fired power plant boiler is characterized in that the flue gas enters a heat exchange tube through a flue gas input tube, the heat in the flue gas is quickly absorbed by a water solution in the heat exchange tube, cold water can be added into the heat exchange tube through a water inlet tube, hot water is discharged outwards through a water outlet tube, and the heat in the flue gas is recovered and utilized, so that the energy conservation and the environmental protection are realized; the flue gas after heat exchange enters a filter box through a first gas pipe, an active carbon adsorption layer in the filter assembly filters and absorbs particles in the flue gas to achieve a primary filtering effect, an induced air fan is started to enable the filtered flue gas to enter a first purification box, a water pump pumps aqueous solution in a water storage box into a water pipe, the aqueous solution then enters a first connecting piece and a second connecting piece through the first water pipe and the second water pipe respectively, a second spray head sprays the flue gas to purify the flue gas, the first spray head sprays the filter cloth to purify the flue gas again, a moist filter cloth purifies the flue gas again, an air extractor is started, the purified gas enters a second gas pipe through a through hole in the first connecting piece and then is uniformly discharged into the aqueous solution in the second purification box through a third connecting piece to filter the gas again, and the treated flue gas is discharged through an exhaust pipe, the purification effect is excellent.
Compared with the prior art, the utility model, have following advantage and effect: the flue gas enters the heat exchange tube through the flue gas input tube, the water solution in the heat exchange box quickly absorbs the heat in the flue gas, cold water can be added into the heat exchange box through the water inlet tube, hot water is discharged outwards through the water outlet tube, and the heat energy in the flue gas is recovered and utilized, so that the energy is saved and the environment is protected; the active carbon adsorption layer filters the absorption to the particulate matter in the flue gas, reach prefilter's effect, the second atomising head sprays towards the flue gas, purify the flue gas, first atomising head sprays towards the filter cloth, moist filter cloth purifies the flue gas once more, the air extractor will be through in the gas suction second gas-supply pipe that purifies, and then evenly arrange the aqueous solution to the second purifying box in through the third connecting piece, purify gas once more, purifying effect is splendid.
Drawings
In order to more clearly illustrate the embodiments and/or prior art solutions of the present invention, the drawings used in the description of the embodiments and/or prior art will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive work.
FIG. 1 is a schematic structural view of a flue gas treatment device of a coal-fired power plant boiler in the embodiment of the present invention.
FIG. 2 is a schematic structural diagram of the connection between the second connecting piece and the second spraying head in the flue gas treatment device of the coal-fired power plant boiler of the embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a filter assembly in a flue gas treatment device of a coal-fired power plant boiler according to an embodiment of the present invention.
Reference numerals: 1. a heat exchange box; 2. a filter box; 3. a water storage tank; 4. a first purge bin; 5. a second purge bin; 6. a heat exchange pipe; 7. a water pump; 8. a first connecting member; 9. filtering cloth; 10. a second connecting member; 11. a first spray head; 12. a second spray head; 13. a blow-off pipe; 14. an air extractor; 15. a third connecting member; 16. a flue gas input pipe; 17. a first gas delivery pipe; 18. a connecting box; 19. a filter assembly; 20. a fan guide; 21. a water delivery pipeline; 22. a first water delivery pipe; 23. a second water delivery pipe; 24. a second gas delivery pipe; 25. a fixing frame; 26. an exhaust pipe; 27. an activated carbon adsorption layer; 28. a first gas collecting member; 29. a second gas collecting member.
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. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in figures 1-3, the utility model provides a coal fired power plant boiler flue gas processing apparatus, including heat transfer case 1, rose box 2, storage water tank 3, first purifying box 4, second purifying box 5, heat exchange tube 6, connecting box 18 and second gas-supply pipe 24.
The top of the heat exchange box 1 is provided with a water inlet pipe with a valve, the bottom of the heat exchange box 1 is provided with a water outlet pipe with a valve, and the heat exchange box 1 is filled with aqueous solution; a flue gas input pipe 16 and a first gas conveying pipe 17 are arranged on the heat exchange box 1, and a first gas collecting piece 28 and a second gas collecting piece 29 are arranged on two sides in the heat exchange box 1; the heat exchange tube 6 is positioned in the heat exchange box 1, and the heat exchange tube 6 is communicated with the first air collecting piece 28 and the second air collecting piece 29; the first air collecting piece 28 is communicated with the flue gas input pipe 16, and the second air collecting piece 29 is communicated with the first air conveying pipe 17; one end of the first gas pipe 17 far away from the heat exchange box 1 is communicated with the filter box 2; a filtering component 19 is arranged in the filtering box 2, and the filtering component 19 is positioned above the communicating part of the first air conveying pipe 17 and the filtering box 2.
A first connecting piece 8 and a filter cloth 9 are horizontally arranged in the first purifying box 4, and the first connecting piece 8 is positioned above the filter cloth 9; through holes are uniformly formed in the first connecting piece 8, a water collecting cavity is formed in the first connecting piece 8, the bottom of the first connecting piece 8 is communicated with a plurality of first spray heads 11, and the spray direction of the first spray heads 11 faces towards the filter cloth 9; a second connecting piece 10 is vertically arranged in the first purifying box 4, and the second connecting piece 10 is positioned below the filter cloth 9; a water collecting cavity is arranged in the second connecting piece 10, and a plurality of second spray heads 12 are arranged on the second connecting piece 10; the spraying direction of the second spraying head 12 is vertical to the smoke output direction; the bottom of the first purifying box 4 is provided with a drain pipe 13 with a valve.
One side of the connecting box 18 is communicated with the filter box 2 through a connecting pipe, and the other side of the connecting box 18 is communicated with the first purifying box 4 through a connecting pipe; the communication part of the connecting box 18 and the filter box 2 is positioned above the filter assembly 19, and the communication part of the connecting box 18 and the first purifying box 4 is positioned below the second connecting piece 10; the filter assembly 19 comprises a fixing frame 25 and an activated carbon adsorption layer 27; the active carbon adsorption layer 27 is positioned in the fixing frame 25, and through holes are uniformly formed in the fixing frame 25; an induced fan 20 is provided in the connection box 18.
A water inlet pipe is arranged on the water storage tank 3, and the water storage tank 3 is communicated with a water delivery pipeline 21; the water pump 7 is arranged on the water delivery pipeline 21, and one end of the water delivery pipeline 21, which is far away from the water storage tank 3, is communicated with a first water delivery pipe 22 and a second water delivery pipe 23; the first water pipe 22 is communicated with the first connecting piece 8, and the second water pipe 23 is communicated with the second connecting piece 10.
The second air conveying pipe 24 is communicated with the first purifying box 4, and the communication position of the second air conveying pipe 24 and the first purifying box 4 is positioned above the first connecting piece 8; the second air delivery pipe 24 is provided with an air extractor 14, and one end of the second air delivery pipe 24, which is far away from the first purification box 4, extends into the second purification box 5 and is connected with a third connecting piece 15; the second purifying box 5 is filled with water solution, and the third connecting piece 15 is positioned in the water solution; the third connecting piece 15 is of a horizontally arranged rectangular structure, the third connecting piece 15 is hollow, and through holes are uniformly formed in the bottom of the third connecting piece 15; the top of the second purifying box 5 is provided with an exhaust pipe 26, the top of the second purifying box 5 is also provided with a water inlet pipe with a valve, and the bottom of the second purifying box is provided with a water outlet pipe with a valve.
In an alternative embodiment, the first air collecting part 28 and the second air collecting part 29 are both vertically arranged rectangular structures, the heat exchange tubes 6 are coiled tubes, the number of the heat exchange tubes 6 is multiple, and the heat exchange tubes are arranged at equal intervals in the longitudinal direction, so that heat in the flue gas can be fully absorbed by the aqueous solution in the heat exchange box 1, heat in the flue gas can be recycled, and environmental pollution can be reduced.
In an optional embodiment, the second connecting member 10 is a cylindrical structure, the second spraying heads 12 are arranged in a plurality of circles in the vertical direction at equal intervals, and each circle of the second spraying heads 12 is distributed in an annular array, so that the purification effect is good, the purification efficiency is high, and dust and harmful gas in the flue gas can be fully absorbed.
In an alternative embodiment, the first water pipe 22 is provided with a valve, and the second water pipe 23 is provided with a valve, so that the amount and the speed of water flowing into the first water pipe 22 and the second water pipe 23 can be controlled.
In the utility model, the flue gas enters the heat exchange tube 6 through the flue gas input tube 16, the water solution in the heat exchange box 1 quickly absorbs the heat in the flue gas, cold water can be added into the heat exchange box 1 through the water inlet tube, hot water is discharged outwards through the water outlet tube, and the heat energy in the flue gas is recovered and utilized, thereby saving energy and protecting environment; the flue gas after heat exchange enters the filter box 2 through the first gas pipe 17, the active carbon adsorption layer 27 in the filter assembly 19 filters and absorbs particles in the flue gas to achieve the effect of primary filtration, the induced air fan 20 is started and enables the filtered flue gas to enter the first purification box 4, the water pump 7 pumps the aqueous solution in the water storage box 3 into the water pipe 21, then the aqueous solution enters the first connecting piece 8 and the second connecting piece 10 through the first water pipe 22 and the second water pipe 23 respectively, the second spray head 12 sprays the flue gas to purify the flue gas, the first spray head 11 sprays the aqueous solution towards the filter cloth 9, the wet filter cloth 9 purifies the flue gas again, the air extractor 14 is started, the purified gas enters the second gas pipe 24 through the through holes on the first connecting piece 8 and then is uniformly discharged into the aqueous solution in the second purification box 5 through the third connecting piece 15, the gas is filtered again, and the treated flue gas is discharged through the exhaust pipe 26, so that the purification effect is excellent.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A coal-fired power plant boiler flue gas treatment device is characterized by comprising a heat exchange box (1), a filter box (2), a water storage box (3), a first purification box (4), a second purification box (5), a heat exchange pipe (6), a connecting box (18) and a second gas transmission pipe (24);
the top of the heat exchange box (1) is provided with a water inlet pipe with a valve, and the bottom of the heat exchange box is provided with a water outlet pipe with a valve; a flue gas input pipe (16) and a first gas conveying pipe (17) are arranged on the heat exchange box (1), and a first gas collecting piece (28) and a second gas collecting piece (29) are arranged on two sides in the heat exchange box (1); the heat exchange tube (6) is positioned in the heat exchange box (1), and two ends of the heat exchange tube (6) are respectively communicated with a first air collecting piece (28) and a second air collecting piece (29); the first air collecting piece (28) is communicated with the smoke input pipe (16), and the second air collecting piece (29) is communicated with one end of the first air conveying pipe (17); the other end of the first gas pipe (17) is communicated with the filter box (2); a filtering component (19) is arranged in the filtering box (2), and the filtering component (19) is positioned above the communication part of the first air conveying pipe (17) and the filtering box (2);
a first connecting piece (8) and filter cloth (9) are arranged in the first purifying box (4), the first connecting piece (8) and the filter cloth (9) are both horizontal, and the first connecting piece (8) is positioned above the filter cloth (9); through holes are uniformly formed in the first connecting piece (8), a water collecting cavity is formed in the first connecting piece (8), the bottom of the first connecting piece (8) is communicated with a plurality of first spray heads (11), and the spray direction of the first spray heads (11) faces towards the filter cloth (9); a second connecting piece (10) is vertically arranged in the first purifying box (4), and the second connecting piece (10) is positioned below the filter cloth (9); a water collecting cavity is arranged in the second connecting piece (10), and a plurality of second spray heads (12) are arranged on the second connecting piece (10); the spraying direction of the second spraying head (12) is vertical to the smoke output direction; a blow-off pipe (13) with a valve is arranged at the bottom of the first purifying box (4);
one side of the connecting box (18) is communicated with the filter box (2) through a connecting pipe, and the other side of the connecting box (18) is communicated with the first purifying box (4) through a connecting pipe; the connecting position of the connecting box (18) and the filter box (2) is positioned above the filter assembly (19), and the connecting position of the connecting box (18) and the first purifying box (4) is positioned below the second connecting piece (10); a fan (20) is arranged in the connecting box (18);
a water inlet pipe is arranged on the water storage tank (3), and the water storage tank (3) is communicated with one end of a water delivery pipeline (21); a water pump (7) is arranged on the water conveying pipeline (21), and the other end of the water conveying pipeline (21) is communicated with a first water conveying pipe (22) and a second water conveying pipe (23); the first water pipe (22) is communicated with the first connecting piece (8), and the second water pipe (23) is communicated with the second connecting piece (10);
one end of the second air conveying pipe (24) is communicated with the first purifying box (4), and the communication position of the second air conveying pipe (24) and the first purifying box (4) is positioned above the first connecting piece (8); an air extractor (14) is arranged on the second air conveying pipe (24), and the other end of the second air conveying pipe (24) extends into the second purifying box (5) and is connected with a third connecting piece (15); the third connecting piece (15) is hollow, and through holes are uniformly formed in the bottom of the third connecting piece; an exhaust pipe (26) is arranged at the top of the second purifying box (5).
2. The coal-fired utility boiler flue gas treatment device according to claim 1, characterized in that the heat exchange tubes (6) are serpentine tubes; and/or the heat exchange tubes (6) are arranged in a plurality of groups at equal intervals in the longitudinal direction.
3. The coal-fired utility boiler flue gas treatment device according to claim 1, characterized in that the first gas collecting member (28) and the second gas collecting member (29) are both vertically arranged rectangular structures.
4. The coal-fired utility boiler flue gas treatment plant according to claim 1, characterized in that the filter assembly (19) comprises a fixed frame (25) and an activated carbon adsorption layer (27); the active carbon adsorption layer (27) is positioned in the fixing frame (25), and through holes are uniformly formed in the fixing frame (25).
5. The coal-fired utility boiler flue gas treatment device according to claim 1, characterized in that the second connection member (10) is of a cylindrical structure.
6. The coal-fired utility boiler flue gas treatment plant according to claim 1, characterized in that the second spray headers (12) are arranged in a plurality of circles in the vertical direction at equal intervals, and the second spray headers (12) are distributed in an annular array for each circle.
7. The coal-fired utility boiler flue gas treatment device according to claim 1, characterized in that the first water pipe (22) is provided with a valve, and the second water pipe (23) is provided with a valve.
8. The coal-fired utility boiler flue gas treatment device according to claim 1, characterized in that the third connection member (15) is a horizontally arranged rectangular structure.
9. The coal-fired utility boiler flue gas treatment device according to claim 1, characterized in that the top of the second purification tank (5) is provided with a water inlet pipe with a valve, and the bottom is provided with a water outlet pipe with a valve.
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| CN201920689895.2U CN210495698U (en) | 2019-05-10 | 2019-05-10 | Coal-fired power plant boiler flue gas processing apparatus |
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| CN201920689895.2U CN210495698U (en) | 2019-05-10 | 2019-05-10 | Coal-fired power plant boiler flue gas processing apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180300A (en) * | 2019-05-10 | 2019-08-30 | 华电电力科学研究院有限公司 | A kind of coal-fired power station boiler flue gas processing device and method |
| CN111744284A (en) * | 2020-07-03 | 2020-10-09 | 嘉兴市布雷塑胶新材料股份有限公司 | Plastic composite process organic tail gas recovery processing system |
-
2019
- 2019-05-10 CN CN201920689895.2U patent/CN210495698U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180300A (en) * | 2019-05-10 | 2019-08-30 | 华电电力科学研究院有限公司 | A kind of coal-fired power station boiler flue gas processing device and method |
| CN111744284A (en) * | 2020-07-03 | 2020-10-09 | 嘉兴市布雷塑胶新材料股份有限公司 | Plastic composite process organic tail gas recovery processing system |
| CN111744284B (en) * | 2020-07-03 | 2021-10-22 | 嘉兴市布雷塑胶新材料股份有限公司 | Plastic composite process organic tail gas recovery processing system |
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