CN104208987B - Device for recovering tail gas in a kind of urea ammonium nitrate solution production - Google Patents
Device for recovering tail gas in a kind of urea ammonium nitrate solution production Download PDFInfo
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- CN104208987B CN104208987B CN201410503697.4A CN201410503697A CN104208987B CN 104208987 B CN104208987 B CN 104208987B CN 201410503697 A CN201410503697 A CN 201410503697A CN 104208987 B CN104208987 B CN 104208987B
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- Prior art keywords
- pipeline
- absorption tower
- ammonium nitrate
- nitrate solution
- urea ammonium
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- CSGLCWIAEFNDIL-UHFFFAOYSA-O azanium;urea;nitrate Chemical compound [NH4+].NC(N)=O.[O-][N+]([O-])=O CSGLCWIAEFNDIL-UHFFFAOYSA-O 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000010521 absorption reaction Methods 0.000 claims abstract description 68
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 34
- 239000000945 filler Substances 0.000 claims abstract description 8
- 238000012856 packing Methods 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 7
- 230000002745 absorbent Effects 0.000 claims description 21
- 239000002250 absorbent Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 9
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 57
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 10
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 239000000618 nitrogen fertilizer Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical group [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Gas Separation By Absorption (AREA)
Abstract
The invention provides the device for recovering tail gas in the production of a kind of urea ammonium nitrate solution, comprise urea ammonium nitrate solution make-up tank, absorption tower, dashpot, circulating pump, cooler and volley pump, absorption tower comprises packing support plate, hold-down grid, filler and distributor, the outlet of urea ammonium nitrate solution make-up tank is connected with absorption tower lower sidewall entrance, absorption tower top exit with volley pump trunnion entrance and be connected, volley pump one end to be connected with dashpot top, be connected with surge tank top bottom absorption tower, dashpot outlet at bottom is connected with pump entry, circulating-pump outlet is connected with cooler entrance, cooler outlet is connected with absorption tower sidewall upper entrance by the first pipeline, first pipeline is connected with the second pipeline of deallocation acid tank, connection is node A, the part of the first pipeline between node A to cooler is connected with the entrance volleying the pump other end.Apparatus of the present invention, technological design is simple, has effectively reclaimed the gas ammonia in tail gas, has reduced consumption, decreased environmental pollution.
Description
Technical field
The invention belongs to chemical fertilizer field, particularly relate to the device for recovering tail gas in the production of a kind of urea ammonium nitrate solution.
Background technology
Urea ammonium nitrate solution (UreaAmmoniumNitratesolution), being called for short UAN solution, abroad also referred to as nitrogen solution (Nsolution), is formulated by urea, ammonium nitrate and water.UAN solution is a kind of liquid nitrogenous fertilizer of stable, colourless, normal pressure, fertilizer efficiency, energy-conservation, reduce environmental pollution, and economic benefit, be all better than solid-state nitrogenous fertilizer, there are bright prospects at home and abroad.
UAN produces the U.S. starting from the seventies in last century, is used widely at present.The output of global urea ammonium nitrate solution in 2013 is more than 2,000 ten thousand tons, and China is nitrogen fertilizer production big country, and the process units of UAN is in the starting stage, and application prospect is very wide.UAN generally adopts normal pressure to produce, and is prepared in proportion by certain density urea liquid and ammonium nitrate solution, and because production temperature is higher, hydrolysis of urea, generates a large amount of gas ammonias (NH3) and carbon dioxide (CO2).Prepare at ambient pressure because UAN produces, gas ammonia is discharged by the blow-down pipe on UAN make-up tank top, and pollution and loss are comparatively large, and production leadtime finds, its proportion of goods damageds are about 0.1-0.2%, namely produce 100 tons of UAN products, and gas ammonia loss is 100-200kg.
Summary of the invention
For above-mentioned technical problem, the object of this invention is to provide the device for recovering tail gas in the production of a kind of urea ammonium nitrate solution, can Production requirement be met, reclaim the gas ammonia in tail gas, reduce and consume, reduce environmental pollution.
The technical solution used in the present invention is:
Device for recovering tail gas in a kind of urea ammonium nitrate solution production, comprise urea ammonium nitrate solution make-up tank, absorption tower, dashpot, circulating pump, cooler and volley pump, described absorption tower comprises packing support plate, hold-down grid, filler and distributor, described filler is arranged between described packing support plate and described hold-down grid, described distributor is arranged on above described hold-down grid, the outlet of described urea ammonium nitrate solution make-up tank is connected with the lower sidewall entrance on described absorption tower by pipeline, the top exit on described absorption tower is connected with the described trunnion entrance volleying pump by pipeline, described one end volleying pump is connected with the top of described dashpot, the bottom on described absorption tower is connected by the top of pipeline with described dashpot, the outlet at bottom of described dashpot is connected by the entrance of pipeline with described circulating pump, described circulation delivery side of pump is connected by the entrance of pipeline with described cooler, the outlet of described cooler is connected with the side wall upper part entrance on absorption tower by the first pipeline, described first pipeline is connected with the second pipeline of deallocation acid tank, connection is node A, the part of described first pipeline between node A to cooler is connected with the described entrance volleying the other end of pump by pipeline, the part of described first pipeline between node A to absorption tower is provided with the first control valve, described second pipeline is provided with the second control valve.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, wherein, be provided with at described absorption tower inner top and add sprinkler head, described in add sprinkler head and be connected with gas ammonia absorbent intake line, described gas ammonia absorbent intake line is provided with the 3rd control valve.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, wherein, the part of described gas ammonia absorbent intake line between the 3rd control valve to absorption tower is connected by pipeline and the pipeline between valve with described urea ammonium nitrate solution make-up tank to absorption tower.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, wherein, described gas ammonia absorbent adopts desalted water or magnesium tail water, is preferably magnesium tail water.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, wherein, the top of described dashpot is also provided with the discharge pipe of on-condensible gas, and described discharge pipe is provided with the 4th control valve.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, wherein, described absorption tower to dashpot pipeline designs is U-tube, and described absorption tower bottom level is higher than dashpot.
Urea ammonium nitrate solution of the present invention produce in device for recovering tail gas, wherein, the controlled pressure in described urea ammonium nitrate solution make-up tank and absorption tower is-20 ~-30KPa.
Beneficial effect of the present invention:
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, by changing UAN solution preparation groove atmospheric pressure device into negative pressure equipment, be Sealing Arrangement by general uncovered equipment de-sign, ensure that gas ammonia and carbon dioxide flow in UAN solution preparation groove and absorption tower, control to answer pressure by the amount of solution volleying pump inlet, utilization volleys pump and produces negative pressure, avoid adopting the power-equipments such as compressor, energy-saving effect is obvious, technological design is simple, meet Production requirement, reclaim the gas ammonia in tail gas, solution after gas ammonia reclaims is recycled to complex acid groove, can be fully used as raw materials for production, reduce consumption, decrease environmental pollution.
Urea ammonium nitrate solution of the present invention produce in device for recovering tail gas, be provided with at described absorption tower inner top and add sprinkler head, described in add sprinkler head and be connected with gas ammonia absorbent intake line, utilize gas ammonia absorbent effectively can absorb gas ammonia in tail gas.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, the part of described gas ammonia absorbent intake line between the 3rd control valve to absorption tower is connected by pipeline and the pipeline between valve with described urea ammonium nitrate solution make-up tank to absorption tower, because temperature reduces in urea ammonium nitrate solution make-up tank to absorption tower Pipeline transport process, easily there is ammonium carbonate crystallization in pipeline, by adding gas ammonia absorbent periodic flushing, pipeline Crystallization Plugging can be avoided.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, described gas ammonia absorbent first-selection adopts magnesium tail water, is secondly desalted water.Magnesium tail water is the waste water that indirect method produces red fuming nitric acid (RFNA), main component is the dust technology of concentration 3-5%, with magnesium tail water as absorbent, magnesium tail water and gas ammonia react fast, and assimilation effect is better, ammonium nitrate solution cyclic absorption concentrate, the ammonium nitrate solution reclaimed is recycled to complex acid groove, then be fully used as raw materials for production, both the nitric acid in efflux wastewater can be recycled, additionally reduce the environmental pollution of discharge nitric acid waste water.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, the top of described dashpot is also provided with the discharge pipe of on-condensible gas, and described discharge pipe is provided with the 4th control valve, can periodic exhaustion on-condensible gas.
Device for recovering tail gas in urea ammonium nitrate solution production of the present invention, described absorption tower to dashpot pipeline designs is U-tube, better can keep the negative pressure in absorption tower, absorption tower device bottom height, higher than dashpot, can ensure that absorption tower lower liquid can be flow in dashpot automatically by potential difference.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device for recovering tail gas during urea ammonium nitrate solution of the present invention is produced.
In figure: 1, UAN solution preparation groove; 2, absorption tower; 21, sprinkler head is added; 22, distributor; 23, filler; 24, packing support plate; 25, hold-down grid; 3, dashpot; 4, circulating pump; 5, cooler; 6, pump is volleyed; 7, the first control valve; 8, the second control valve; 9, the 3rd control valve; 10, the first pipeline; 11, second pipe; 12, the 4th control valve; 13, valve.
Below with reference to drawings and Examples, the present invention is described in detail.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, device for recovering tail gas in a kind of urea ammonium nitrate solution production, comprise UAN solution preparation groove 1, absorption tower 2, dashpot 3, circulating pump 4, cooler 5 and volley pump 6, absorption tower 2 comprises packing support plate 24, hold-down grid 25, filler 23 and distributor 22, filler 23 is arranged between packing support plate 24 and hold-down grid 25, distributor 22 is arranged on above hold-down grid 25, be provided with at absorption tower 2 inner top and add sprinkler head 21, add sprinkler head 21 to be connected with gas ammonia absorbent intake line, described gas ammonia absorbent intake line is provided with the 3rd control valve 9, described gas ammonia absorbent adopts magnesium tail water, the outlet of UAN solution preparation groove 1 is connected with the lower sidewall entrance on absorption tower 2 by pipeline, the top exit on absorption tower 2 is connected with the trunnion entrance volleying pump 6 by pipeline, the one end volleying pump 6 is connected with the top of dashpot 3, the bottom on absorption tower 2 is connected by the top of pipeline with surge tank 3, the outlet at bottom of dashpot 3 is connected by the entrance of pipeline with circulating pump 4, the outlet of circulating pump 4 is connected by the entrance of pipeline with cooler 5, the outlet of cooler 5 is connected with the side wall upper part entrance on absorption tower 2 by the first pipeline 10, first pipeline 10 is connected with the second pipeline 11 of deallocation acid tank, connection is node A, the part of the first pipeline 10 between node A to cooler 2 is connected by the entrance of pipeline with the other end volleying pump 6, the part of the first pipeline 10 between node A to absorption tower 2 is provided with the first control valve 7, second pipeline 11 is provided with the second control valve 8, the part of described gas ammonia absorbent intake line between the 3rd control valve 9 to absorption tower 2 is connected by pipeline and the pipeline between valve 13 with UAN solution preparation groove 1 to absorption tower 2, the top of dashpot 3 is also provided with the discharge pipe of on-condensible gas, and described discharge pipe is provided with the 4th control valve 12, and absorption tower 2 to dashpot 3 pipeline designs is U-tube, and the bottom level on absorption tower 2 is higher than dashpot 3.
The operation principle of the device for recovering tail gas in the production of the present embodiment urea ammonium nitrate solution: in the course of the work, in UAN solution preparation groove 1, gas ammonia and carbon dioxide enter into bottom, absorption tower 2 by pipeline, and gas ammonia and carbon dioxide upwards pass through absorption tower 2 at the bottom of the tower of absorption tower 2; The negative pressure on absorption tower 2 produces by volleying pump 6, volley pump 6 and carry liquid by circulating pump, produce relative negative pressure volleying pump 6 trunnion place, vacuum cavitations is-20 to-30KPa, volley pump 6 trunnion to be connected with absorption tower 2 top gas phase, absorption tower 2 top gas is extracted out, in absorption tower 2 and UAN solution preparation groove 1, produce negative pressure, gas ammonia and carbon dioxide flow in UAN solution preparation groove 1 and absorption tower 2, complete absorption process; It is exothermic reaction that absorption tower 2 absorbs gas ammonia, and solution temperature raises, and by cooler 5, is reduced by solution temperature; After solution absorbs gas ammonia, generate ammonium nitrate solution, after cooler 5 is lowered the temperature, be divided into three parts, a part is as volleying pump 6 power, negative pressure is produced on absorption tower 2 and UAN solution preparation groove 1, a part of absorbent as absorption tower 2, cyclic absorption gas ammonia, some is after concentration improves, deliver to complex acid groove, as the raw material producing ammonium nitrate and UAN.
Embodiment 2
Be with the difference of embodiment 1: the present embodiment gas ammonia absorbent adopts desalted water.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (8)
1. the device for recovering tail gas in a urea ammonium nitrate solution production, it is characterized in that: comprise urea ammonium nitrate solution make-up tank (1), absorption tower (2), dashpot (3), circulating pump (4), cooler (5) and volley pump (6), described absorption tower (2) comprises packing support plate (24), hold-down grid (25), filler (23) and distributor (22), described filler (23) is arranged between described packing support plate (24) and described hold-down grid (25), described distributor (22) is arranged on described hold-down grid (25) top, the outlet of described urea ammonium nitrate solution make-up tank (1) is connected by the lower sidewall entrance of pipeline with described absorption tower (2), the top exit on described absorption tower (2) is connected with the described trunnion entrance volleying pump (6) by pipeline, described one end volleying pump (6) is connected with the top of described dashpot (3), the bottom on described absorption tower (2) is connected by the top of pipeline with described dashpot (3), the outlet at bottom of described dashpot (3) is connected by the entrance of pipeline with described circulating pump (4), the outlet of described circulating pump (4) is connected by the entrance of pipeline with described cooler (5), the outlet of described cooler (5) is connected by the side wall upper part entrance of the first pipeline (10) with absorption tower (2), described first pipeline (10) is connected with second pipeline (11) of deallocation acid tank, connection is node A, the part that described first pipeline (10) is positioned between node A to cooler (5) is connected with the described entrance volleying the other end of pump (6) by pipeline, the part that described first pipeline (10) is positioned between node A to absorption tower (2) is provided with the first control valve (7), described second pipeline (11) is provided with the second control valve (8).
2. the device for recovering tail gas in urea ammonium nitrate solution production according to claim 1, it is characterized in that: be provided with at described absorption tower (2) inner top and add sprinkler head (21), the described sprinkler head (21) that adds is connected with gas ammonia absorbent intake line, described gas ammonia absorbent intake line is provided with the 3rd control valve (9).
3. the device for recovering tail gas in urea ammonium nitrate solution production according to claim 2, is characterized in that: the part that described gas ammonia absorbent intake line is positioned between the 3rd control valve (9) to absorption tower (2) is connected by pipeline and the pipeline between valve (13) with described urea ammonium nitrate solution make-up tank (1) to absorption tower (2).
4. the device for recovering tail gas in the urea ammonium nitrate solution production according to Claims 2 or 3, is characterized in that: described gas ammonia absorbent adopts desalted water or magnesium tail water.
5. the device for recovering tail gas in urea ammonium nitrate solution production according to claim 4, is characterized in that: described gas ammonia absorbent adopts magnesium tail water.
6. the device for recovering tail gas in urea ammonium nitrate solution production according to claim 5, it is characterized in that: the top of described dashpot (3) is also provided with the discharge pipe of on-condensible gas, described discharge pipe is provided with the 4th control valve (12).
7. the device for recovering tail gas in urea ammonium nitrate solution production according to claim 6, it is characterized in that: described absorption tower (2) are U-tube to dashpot (3) pipeline designs, the bottom level of described absorption tower (2) is higher than dashpot (3).
8. urea ammonium nitrate solution according to claim 7 produce in device for recovering tail gas, it is characterized in that: the controlled pressure in described urea ammonium nitrate solution make-up tank (1) and absorption tower (2) is-20 ~-30KPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410503697.4A CN104208987B (en) | 2014-09-26 | 2014-09-26 | Device for recovering tail gas in a kind of urea ammonium nitrate solution production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410503697.4A CN104208987B (en) | 2014-09-26 | 2014-09-26 | Device for recovering tail gas in a kind of urea ammonium nitrate solution production |
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| CN104208987A CN104208987A (en) | 2014-12-17 |
| CN104208987B true CN104208987B (en) | 2016-03-02 |
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| CN201410503697.4A Expired - Fee Related CN104208987B (en) | 2014-09-26 | 2014-09-26 | Device for recovering tail gas in a kind of urea ammonium nitrate solution production |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105126546B (en) * | 2015-08-10 | 2017-09-22 | 大唐环境产业集团股份有限公司 | A kind of ammonia absorption treating device and method |
| CN105413406B (en) * | 2015-12-27 | 2017-10-24 | 安徽淮化股份有限公司 | The recovery system and its operating method of gas ammonia in a kind of emptying end gas |
| CN105920979A (en) * | 2016-05-23 | 2016-09-07 | 肥西县鑫山机械厂 | Industrial tail gas fine purifier |
| CN105944510A (en) * | 2016-07-03 | 2016-09-21 | 安徽碧源环保工程有限公司 | Industrial tail gas fine cleaning process |
| CN105944516A (en) * | 2016-07-03 | 2016-09-21 | 安徽碧源环保工程有限公司 | Industrial tail gas fine cleaner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102515877A (en) * | 2011-12-20 | 2012-06-27 | 中国成达工程有限公司 | Preparation method for urea ammonium nitrate solution |
| CN102527218A (en) * | 2012-01-05 | 2012-07-04 | 江苏融泰化工有限公司 | Treatment device for ammonia-containing waste gas |
| CN103894048A (en) * | 2014-04-18 | 2014-07-02 | 中石化南京工程有限公司 | Method for treating low-concentration ammonia-containing tail gas |
| CN204247032U (en) * | 2014-09-26 | 2015-04-08 | 安徽淮化股份有限公司 | Device for recovering tail gas in a kind of urea ammonium nitrate solution production |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53147679A (en) * | 1977-05-31 | 1978-12-22 | Nippon Solid Co Ltd | Deodorization method |
| JPS54150366A (en) * | 1978-05-18 | 1979-11-26 | Toshiba Corp | Deodorizing apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102515877A (en) * | 2011-12-20 | 2012-06-27 | 中国成达工程有限公司 | Preparation method for urea ammonium nitrate solution |
| CN102527218A (en) * | 2012-01-05 | 2012-07-04 | 江苏融泰化工有限公司 | Treatment device for ammonia-containing waste gas |
| CN103894048A (en) * | 2014-04-18 | 2014-07-02 | 中石化南京工程有限公司 | Method for treating low-concentration ammonia-containing tail gas |
| CN204247032U (en) * | 2014-09-26 | 2015-04-08 | 安徽淮化股份有限公司 | Device for recovering tail gas in a kind of urea ammonium nitrate solution production |
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Effective date of registration: 20210413 Address after: 234000 No. 157, Xichang Road, Suzhou, Anhui Patentee after: WANBEI COAL-ELECTRICITY GROUP Co.,Ltd. Address before: 232038 Anhui Huainan Tian Jia An District Quanshan Anhui Huaihua Limited by Share Ltd technology research and Development Center Patentee before: ANHUI HUAIHUA Co.,Ltd. |
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