CN210464078U - Smelting flue gas treatment system - Google Patents
Smelting flue gas treatment system Download PDFInfo
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- CN210464078U CN210464078U CN201921155800.5U CN201921155800U CN210464078U CN 210464078 U CN210464078 U CN 210464078U CN 201921155800 U CN201921155800 U CN 201921155800U CN 210464078 U CN210464078 U CN 210464078U
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- flue gas
- treatment system
- gas treatment
- activated carbon
- calcium hydroxide
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- 239000003546 flue gas Substances 0.000 title claims abstract description 87
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000003723 Smelting Methods 0.000 title claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000000428 dust Substances 0.000 claims abstract description 34
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 27
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000007921 spray Substances 0.000 claims abstract description 26
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 238000010791 quenching Methods 0.000 claims abstract description 19
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 239000002918 waste heat Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 9
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 241001062472 Stokellia anisodon Species 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 19
- 239000003054 catalyst Substances 0.000 description 7
- 239000000779 smoke Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- -1 V)2O5 Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a smelt flue gas processing system. The flue gas treatment system comprises an SNCR (selective non-catalytic reduction) denitration device, a spray quenching tower, a dust collecting device, a desulfurization tower, a demisting device and an SCR (selective catalytic reduction) denitration device which are sequentially connected in series; the gas outlet of the SCR denitration device is communicated with the flue gas heat exchanger; an activated carbon injection device and a calcium hydroxide injection device are arranged on a pipeline between the spray quenching tower and the dust collection device; the SNCR denitration device is arranged at a flue gas outlet of the side-blown converter. The utility model discloses a flue gas processing system's denitration efficiency can reach more than 90%.
Description
Technical Field
The utility model relates to a smelt flue gas processing system belongs to the flue gas and handles the field.
Background
SO in flue gas discharged in smelting process2、NOX(mainly comprising NO and NO)2) Is one of the main pollutants of the atmosphere, and causes great harm to the health of human beings and the natural environment.
The desulfurization process is mature at present, but the flue gas denitrification is always the key point and the difficulty of pollutant removal. SNCR (selective non-catalytic reduction), also known as high-heat denitration, is a process in which an amino-containing reducing agent (e.g., NH)3Urea) is sprayed into a region with the hearth temperature of 850-1100 ℃, and then is rapidly thermally decomposed into NH3And other by-products, followed by NH3SNCR reaction with NOx in flue gas to produce N2. SCR (Selective catalytic reduction) is carried out by reacting NH with catalyst3As the reducing agent, a vanadium-titanium catalyst, a noble metal catalyst or a metal oxide (e.g., V)2O5、WO3Etc.) as catalyst, selectively reacting with NOx in fume to generate non-toxic and pollution-free N2And H2O。
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a smelt flue gas processing system, this flue gas processing system jointly uses SNCR and SCR method, can improve the ability of denitration effectively, and denitration efficiency can reach more than 90%.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is:
a smelting flue gas treatment system is structurally characterized by comprising an SNCR (selective non-catalytic reduction) denitration device, a spray quenching tower, a dust collecting device, a desulfurization tower, a demisting device and an SCR (selective catalytic reduction) denitration device which are sequentially connected in series; an activated carbon injection device and a calcium hydroxide injection device are arranged on a pipeline between the spray quenching tower and the dust collection device; the SNCR denitration device is arranged at a flue gas outlet of the side-blown converter.
The utility model discloses active carbon injection apparatus is used for providing active carbon powder in to the pipeline, and calcium hydrate injection apparatus is used for providing calcium hydrate powder in to the pipeline.
Therefore, the utility model discloses a smelt the flue gas and come out after from the exhanst gas outlet of side blown converter, handle through above-mentioned equipment in proper order, denitration efficiency can reach more than 90% to satisfy the requirement of discharge to reach standard.
According to the utility model discloses an embodiment, can also be right the utility model discloses do further optimization, following for optimizing the technical scheme who forms afterwards:
in order to further adsorb harmful substances in the flue gas, the activated carbon spraying device comprises an activated carbon bin, a feeding machine and a fan; the fan is used for conveying the activated carbon in the activated carbon bin into the feeder, and the feeder is used for conveying the activated carbon into the pipeline.
Preferably, the calcium hydroxide spraying device comprises a calcium hydroxide bin, a feeding machine and a fan; the fan is used for conveying the calcium hydroxide in the calcium hydroxide bin into the feeder, and the feeder is used for conveying the calcium hydroxide into the pipeline.
Therefore, the calcium hydroxide injection device and the activated carbon injection device perform dry deacidification, and the calcium hydroxide is used as a dry deacidification agent. The activated carbon spraying system ensures that the activated carbon and the flue gas are uniformly mixed, so that the effect of efficient adsorption is achieved, and the activated carbon is coal or wood.
In order to further improve the denitration efficiency, a flue gas outlet of the side-blown converter is communicated with a gas inlet of the waste heat boiler; the SNCR denitration device comprises a reducing agent storage bin and an SNCR denitration spray gun; and an SNCR denitration spray gun is arranged on a water-cooled wall of the waste heat boiler and is used for spraying the reducing agent in the reducing agent storage bin into the flue gas. Therefore, after the temperature of the flue gas is reduced to be not lower than 500 ℃ by the waste heat boiler, the flue gas enters the spray quenching tower and crosses the synthesis temperature of the dioxin, and the generation of the dioxin is avoided or reduced.
Preferably, the dust collecting device is a bag dust collector, and a buried scraper for conveying the smoke dust collected by the dust hopper to a smoke dust warehouse is arranged in the bag dust collector. This allows for a non-stop flue gas treatment.
In order to improve the air supply capacity, an induced draft fan is installed on a pipeline between the dust collection device and the desulfurizing tower.
Preferably, the SCR denitration device comprises a flue gas heat exchanger, a flue gas heater and an SCR denitration device which are sequentially connected in series; and the gas outlet pipeline of the SCR denitrator passes through the flue gas heat exchanger.
Preferably, the demister is an electric demister.
Compared with the prior art, the beneficial effects of the utility model are that: flue gas that oxygen boosting side-blown converter came out gets into the utility model discloses a smelt among the flue gas processing system and handle the back and can the evacuation up to standard, denitration efficiency is up to more than 90%.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure
1-an SCR denitration device; 2-flue gas heat exchanger; 3-a flue gas heater; 4-an electric demister; 5-a desulfurizing tower; 6-smoke dust warehouse; 7-a draught fan; 8-a fan; 9-calcium hydroxide bin; 10-a feeder; 11-bag house; 12-an activated carbon silo; 13-spray quench tower; 14-SNCR denitration spray gun; 15-side blown converter; 16-a reductant storage bin; 17-waste heat boiler.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
A smelting flue gas treatment system comprises a waste heat boiler 17, a spray quenching tower 13, a bag dust collector 12, an induced draft fan 7, a wet desulphurization tower 5, an electric demister 4, a flue gas heat exchanger 2 (GGH), a flue gas heater 3 (SGH) and an SCR denitration device 1 which are sequentially connected in series as shown in figure 1. Wherein the dust collecting cavity of the bag dust collector 12 is communicated with the smoke dust warehouse 6. An activated carbon injection device and a calcium hydroxide injection device are arranged on a pipeline between the spray quenching tower 13 and the bag dust collector 12. Wherein the activated carbon is fed before and the calcium hydroxide is fed after. Specifically, the activated carbon spraying device comprises an activated carbon bin 12, and activated carbon in the activated carbon bin 12 is conveyed into the screw feeder 10 through the fan 8 and then conveyed into a pipeline. The calcium hydroxide spraying device comprises a calcium hydroxide bin 9, and calcium hydroxide in the calcium hydroxide bin 9 is conveyed into another screw feeder 10 through another fan 8 and then conveyed into a pipeline.
An SNCR denitration spray gun 14 is arranged on a water-cooled wall of the waste heat boiler 17, and the SNCR denitration spray gun 14 is used for spraying the reducing agent in the reducing agent storage bin 16 into flue gas.
And the flue gas from the oxygen-enriched side-blown converter 15 enters a smelting flue gas treatment system, and can be emptied after treatment.
In the embodiment, the SNCR and SCR methods are mainly used in a combined manner, about 10% of urea aqueous solution is uniformly sprayed on a water-cooled wall in the temperature range of 950-1050 ℃ of the flue gas temperature of the waste heat boiler 17 through the SNCR denitration spray gun 14, the aim of removing and reducing the nitrogen oxides in the flue gas is fulfilled through selective reduction of the urea and the nitrogen oxides in the flue gas, and the denitration efficiency is 40-70%.
The flue gas treatment system of this embodiment mainly comprises injection apparatus, storage and conveyor, sets up the mouth of spouting of 4 SNCR denitration spray guns 14 on exhaust-heat boiler 17, guarantees that the abundant of reductant adds. The flue gas in the waste heat boiler 17 is cooled to be not lower than 500 ℃ and enters the spray quenching tower 13 to be fully contacted with atomized water or lime slurry sprayed from a cooling spray gun. The atomized water absorbs a large amount of heat because the high-temperature flue gas is heated and rapidly evaporated, and meanwhile, the high-temperature flue gas is rapidly cooled to the temperature of less than 200 ℃, so that a dioxin synthesis interval is avoided. The temperature of the flue gas at the outlet of the spray quenching tower 13 is lower than 200 ℃, the flue gas at the outlet of the spray quenching tower 13 is connected with the bag dust collector 11 through a smoke tube, a calcium hydroxide injection device and an active carbon injection device are arranged between the spray quenching tower 13 and the bag dust collector 11 for dry deacidification, calcium hydroxide is used as a dry deacidification agent, an active carbon injection system ensures that the active carbon and the flue gas are uniformly mixed, the efficient adsorption effect is achieved, and the active carbon is coal or wood. The flue gas passes through a bag dust collector 11, and the smoke dust is collected by an ash bucket and conveyed to a smoke dust warehouse 6 through a buried scraper. Flue gas after the dust removal gets into desulfurizing tower 5 through the draught fan and carries out the desulfurization, adopt sodium hydroxide to carry out wet flue gas desulfurization as alkali lye, get into rear end SCR denitrification facility 1 through electrostatic defogging and further get rid of the NOx in the flue gas, the flue gas that comes out from wet electric defogging gets into the GGH heat exchanger, improve the temperature to about 130 ℃, reentrant SGH heat exchanger carries out the heat transfer with saturated steam, improve the flue gas temperature to the reaction temperature who adapts to low temperature SCR catalyst, reentrant SCR system denitration, flue gas after the denitration carries out the GGH heat exchanger heat transfer with the flue gas of wet electric defogging export, reduce the temperature to discharge up to standard more than 135 ℃. When the NOx in the flue gas passes through the catalyst layer, the NOx in the flue gas and the reducing agent are subjected to selective reaction on the surface of the catalyst layer, so that the aim of further removing the NOx in the flue gas is fulfilled, and meanwhile, dioxin can be removed. The SCR denitration device mainly comprises the following components: high-temperature flue gas/flue gas heat exchanger 2 (GGH), steam/flue gas heater 3 (SGH), SCR reactor 1 etc. denitration efficiency can reach more than 90%.
The process flow of the embodiment is as follows: side-blown furnace flue gas → SNCR denitration → waste heat recovery → flue gas quench tower → dry deacidification, activated carbon adsorption → bag dust removal → induced draft fan → wet deacidification → wet electric demisting → GGH heat exchanger → flue gas heating SGH → SCR system → discharge after reaching standards.
The functional requirements of this embodiment are: the waste heat is retrieved in the high temperature flue gas that oxygen boosting side blown smelting furnace produced gets into exhaust-heat boiler 17, set up SNCR denitration spray gun (4 sets at least) on exhaust-heat boiler 17's the vertical flue (the flue gas temperature interval is at 850~1100 ℃), exhaust-heat boiler falls the flue gas temperature to and is not less than 500 ℃ after the flue gas gets into the spraying quench tower, cross the synthetic temperature of dioxin, quench tower exit temperature is less than 200 ℃, quench tower exit flue gas passes through tobacco pipe and connects the sack dust collector, set up calcium hydroxide injection apparatus and active carbon injection apparatus between quench tower and the sack dust collector. Flue gas enters a flue gas desulfurization system after being dedusted by a bag dust collector, and the desulfurized flue gas enters an SCR denitration device after passing through an electric demister, a GGH heat exchanger and a flue gas heater SGH.
The above-mentioned embodiments are illustrative and should not be construed as limiting the scope of the invention, which is defined by the appended claims, and all modifications of the equivalent forms of the present invention which are obvious to those skilled in the art after reading the present invention.
Claims (8)
1. A smelting flue gas treatment system is characterized by comprising an SNCR (selective non-catalytic reduction) denitration device, a spray quenching tower (13), a dust collecting device, a desulfurization tower (5), a demisting device and an SCR (selective catalytic reduction) denitration device which are sequentially connected in series;
an activated carbon injection device and a calcium hydroxide injection device are arranged on a pipeline between the spray quenching tower (13) and the dust collecting device;
the SNCR denitration device is arranged at a flue gas outlet of the side-blown converter (15).
2. Smelting flue gas treatment system according to claim 1, wherein the activated carbon injection device comprises an activated carbon silo (12), a feeder (10) and a fan (8); the fan (8) is used for conveying the activated carbon in the activated carbon bin (12) into the feeder (10), and the feeder (10) is used for conveying the activated carbon into the pipeline.
3. The smelting flue gas treatment system according to claim 1, wherein the calcium hydroxide injection apparatus includes a calcium hydroxide bin (9), a feeder (10), and a fan (8); the fan (8) is used for conveying the calcium hydroxide in the calcium hydroxide bin (9) into the feeder (10), and the feeder (10) is used for conveying the calcium hydroxide into the pipeline.
4. Smelting flue gas treatment system according to claim 1, wherein the flue gas outlet of the side-blown converter is in communication with an inlet of a waste heat boiler (17); the SNCR denitration device comprises a reducing agent storage bin (16) and an SNCR denitration spray gun (14); and an SNCR denitration spray gun (14) is arranged on a water-cooled wall of the waste heat boiler (17), and the SNCR denitration spray gun (14) is used for spraying the reducing agent in the reducing agent storage bin (16) into flue gas.
5. Smelting flue gas treatment system according to any one of claims 1 to 4, wherein the dust collecting means is a bag collector (11), and a scraper blade is provided in the bag collector (11) for feeding the dust collected by the dust hopper to the dust storage (6).
6. Smelting flue gas treatment system according to any one of claims 1 to 4, wherein an induced draft fan (7) is installed on the piping between the dust collecting device and the desulfurizing tower (5).
7. Smelting flue gas treatment system according to any one of claims 1 to 4, wherein the SCR denitration device comprises a flue gas heat exchanger (2), a flue gas heater (3) and an SCR denitration device (1) which are connected in series in sequence; and an air outlet pipeline of the SCR denitrator (1) passes through the flue gas heat exchanger (2).
8. Smelting flue gas treatment system according to any one of claims 1 to 4, wherein the demister is an electric demister (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155800.5U CN210464078U (en) | 2019-07-23 | 2019-07-23 | Smelting flue gas treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155800.5U CN210464078U (en) | 2019-07-23 | 2019-07-23 | Smelting flue gas treatment system |
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| Publication Number | Publication Date |
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| CN210464078U true CN210464078U (en) | 2020-05-05 |
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|---|---|---|---|
| CN201921155800.5U Active CN210464078U (en) | 2019-07-23 | 2019-07-23 | Smelting flue gas treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705225A (en) * | 2020-07-24 | 2020-09-25 | 中国恩菲工程技术有限公司 | Method and device for preparing nickel matte |
| CN114459253A (en) * | 2021-12-30 | 2022-05-10 | 荆门格林循环电子废弃物处置有限公司 | Organic tail gas processing system is smelted to circuit board |
-
2019
- 2019-07-23 CN CN201921155800.5U patent/CN210464078U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705225A (en) * | 2020-07-24 | 2020-09-25 | 中国恩菲工程技术有限公司 | Method and device for preparing nickel matte |
| CN114459253A (en) * | 2021-12-30 | 2022-05-10 | 荆门格林循环电子废弃物处置有限公司 | Organic tail gas processing system is smelted to circuit board |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210602 Address after: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Patentee after: CENTRAL SOUTH University Address before: 410006 Second Floor of 10 Skirt Buildings, No. 1, Liandong Yougu Industrial Park, 32 Yuelian Street, Yuelu District, Changsha City, Hunan Province Patentee before: HUNAN RUIYI ZIHUAN TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20220303 Address after: 543002 room 325, third floor, information center building, No. 6, Guangyuan Avenue, Wuzhou import renewable resources processing park, Longwei District, Wuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Guangxi Ruiyi Environmental Technology Co.,Ltd. Address before: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Patentee before: CENTRAL SOUTH University |
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| TR01 | Transfer of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A smelting flue gas treatment system Granted publication date: 20200505 Pledgee: Bank of Communications Ltd. Wuzhou branch Pledgor: Guangxi Ruiyi Environmental Technology Co.,Ltd. Registration number: Y2024980026136 |
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