CN201988324U - Multi-section combined desulfurizer - Google Patents
Multi-section combined desulfurizer Download PDFInfo
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- CN201988324U CN201988324U CN2010205956396U CN201020595639U CN201988324U CN 201988324 U CN201988324 U CN 201988324U CN 2010205956396 U CN2010205956396 U CN 2010205956396U CN 201020595639 U CN201020595639 U CN 201020595639U CN 201988324 U CN201988324 U CN 201988324U
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- ammonium sulfurous
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Abstract
The utility model discloses a multi-section combined desulfurizer, which comprises a desulfurizing tower, an ammonium sulfite circulating pump, a gas-liquid mixer and a heat exchanger. The desulfurizing tower comprises a section A, a section B, a section C and a section D, wherein the desulfurizing tower section A is positioned at the bottommost portion, the desulfurizing tower section B is positioned on the upper portion of the desulfurizing tower section A, the desulfurizing tower section C is positioned on the upper portion of the desulfurizing tower section B, and the desulfurizing tower section D is positioned at the uppermost end, the desulfurizing tower section A is connected with the desulfurizing tower section B by a gas rising cap, the desulfurizing tower section B is connected with the desulfurizing tower section C by a gas rising cap, and the desulfurizing tower section C and the desulfurizing tower section D are directly connected. The bottom of the desulfurizing tower section B and the bottom of the desulfurizing tower section C are respectively provided with a liquid level stabilizing device, different forms of internal parts are arranged inside the section A, the section B, the section C and the section D of the desulfurizing tower, one side of the bottom of the desulfurizing tower section A is provided with the gas-liquid mixer, and an ammonium sulfite solution outlet at the bottom of the desulfurizing tower section A is provided with the heat exchanger. The multi-section combined desulfurizer is small in floor space, high in desulfurizing efficiency and not easy to be blocked.
Description
Technical field
The utility model relates to the desulphurization plant field of solvent reclamation sour gas in the synthetic gas purification process of coal burning flue gas desulfurization and synthetic ammonia, methyl alcohol, is specifically related to a kind of multistage combined desulfurizing device.
Background technology
Coal is the main domestic fuel of China, and is widely used in generating, industrial and civilian, and in recent years along with Chinese economic development, energy resource consumption is in rapid increase, and the discharge capacity of the sulfur dioxide that is caused by fire coal remains high always.Boiler flue gas desulfurization has become the main subject under discussion of numerous environment specialist's researchs.In China, ammonia-process desulfurization technique has good development soil, because the product of the ammonia process of desulfurization is the ammonium sulfate fertilizer of high added value, has good using value.
The sulfur content of the feed coal that is adopted in synthetic ammonia and the methanol synthesizing process is higher, is not reclaimed if be discharged into airborne sulphur, will contaminated air.Especially the hydrogen sulfide tail gas that produces in the low-temperature rectisol process.Hydrogen sulfide is a kind of colourless gas, and special rotten egg smell is arranged, liquid such as water-soluble, alcohol, ether.It is a kind of irritative gas, also is a kind of asphyxiant gas.The harm of hydrogen sulfide is very big.Reclaim after being oxidized to sulfur dioxide hydrogen sulfide is all or part of in the prior art because hydrogen sulfide content is very high in the tail gas that processes such as low-temperature rectisol produce, therefore be oxidized to sulfur dioxide after, the content of sulfur dioxide height.
For the high gas sweetening of content of sulfur dioxide, as the common hollow-spraying-tower that adopts prior art then needs a plurality of tandem workings of desulfurizing tower and pre-desulfurization section is set could satisfy desulfuration efficiency and make the tail gas can qualified discharge, so just increases floor space and increases investment; If adopt high packed tower and the bubble column of absorption efficiency, under the very high situation of sulfur content, easily stop up.
Therefore, seek a kind of more economical and effective, floor space is little, desulfuration efficiency is high, not susceptible to plugging desulfurizing tower device becomes a kind of urgent demand.
Summary of the invention
In order to overcome above-mentioned shortcoming, the utility model provides a kind of desulfuration efficiency height, little, the not susceptible to plugging multistage combined desulfurizing device of floor space.
The purpose of this utility model is achieved in that a kind of multistage combined desulfurizing device, comprise desulfurizing tower, ammonium sulfurous circulating pump, air and liquid mixer, heat exchanger, it is characterized in that: described desulfurizing tower comprises four sections of A, B, C, D, desulfurizing tower A section is positioned at bottommost, desulfurizing tower B section is positioned at desulfurizing tower A section top, desulfurizing tower C section is positioned at desulfurizing tower B section top, and desulfurizing tower D section is positioned at topmost; Described desulfurizing tower A section is the spray void tower, comprises smoke inlet, absorbent inlet, ammonium sulfurous solution inlet, ammonium sulfurous taphole; Described desulfurizing tower B section is the random packing tower, comprises ammonium sulfurous solution inlet, ammonium sulfurous taphole; Described desulfurizing tower C section is a regular packed tower, comprises ammonium sulfurous solution inlet, ammonium sulfurous taphole; Described desulfurizing tower D section is a bubble column, comprises fresh water (FW) inlet, drain; Described air and liquid mixer is positioned at desulfurizing tower A section bottom one side, comprises gas ammonia inlet, ammonium sulfurous solution inlet, absorbent outlet; Described heat exchanger is positioned at the ammonium sulfurous circulating-pump outlet that links to each other with described desulfurizing tower A section ammonium sulfurous taphole; Heat exchanger entrance is connected by pipeline with described ammonium sulfurous circulating-pump outlet.
Described desulfurizing tower B section bottom one side is provided with the level stability device, control desulfurizing tower B section bottoms level, and desulfurizing tower B section is connected by rising gas cap with described desulfurizing tower A section; Described desulfurizing tower C section bottom one side is provided with the level stability device, control desulfurizing tower C section bottoms level, and desulfurizing tower C section is connected by rising gas cap with described desulfurizing tower B section; Described desulfurizing tower D section directly is connected with described desulfurizing tower C section; The ammonium sulfurous taphole of described desulfurizing tower A section, desulfurizing tower B section and desulfurizing tower C section is provided with an ammonium sulfurous circulating pump respectively at least.
Described air and liquid mixer absorbent outlet is connected by pipeline with described desulfurizing tower A section absorbent inlet, and air and liquid mixer ammonium sulfurous solution inlet is connected by pipeline with described heat exchanger ammonium sulfurous taphole; Described air and liquid mixer mixes from the ammonium sulfurous solution of heat exchanger and from the gas ammonia outside the battery limit (BL), mixed solution enters desulfurizing tower A section bottom, the amount that adds gas ammonia by control is regulated desulfurizing tower A section bottom pH value, the absorption reaction balance when increasing suddenly or reducing by control pH value adjusting exhaust gas volumn; Described heat exchanger is used to shift out a large amount of heat that desulfurizing tower A section produces because of absorption reaction.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is a kind of multistage combined desulfurizing device of the utility model schematic diagram.
In Fig. 1,1, desulfurizing tower, 2, desulfurizing tower A section, 3, desulfurizing tower B section, 4, desulfurizing tower C section, 5, desulfurizing tower D section, 6, smoke inlet, 7, ammonium sulfurous taphole F, 8, the absorbent inlet, 9, ammonium sulfurous solution inlet E, 10, ammonium sulfurous taphole H, 11, ammonium sulfurous solution inlet G, 12, ammonium sulfurous taphole J, 13, ammonium sulfurous solution inlet I, 14, the fresh water (FW) inlet, 15, drain, 16, rise gas cap K, 17, rise gas cap L, 18, level stability device M, 19, level stability device N, 20, ammonium sulfurous circulating pump O, 21, ammonium sulfurous circulating pump P, 22, ammonium sulfurous circulating pump Q, 23, air and liquid mixer, 24, heat exchanger, 25, the gas ammonia inlet, 26, the absorbent outlet, 27, ammonium sulfurous solution inlet R.
The specific embodiment
A kind of multistage combined desulfurizing device, comprise desulfurizing tower 1, ammonium sulfurous circulating pump O 20, ammonium sulfurous circulating pump P 21, ammonium sulfurous circulating pump Q 22, air and liquid mixer 23, heat exchanger 24, it is characterized in that: described desulfurizing tower comprises four sections of A, B, C, D, desulfurizing tower A section 2 is positioned at bottommost, desulfurizing tower B section 3 is positioned at desulfurizing tower A section 2 tops, desulfurizing tower C section 4 is positioned at desulfurizing tower B section 3 tops, and desulfurizing tower D section 5 is positioned at topmost; Described desulfurizing tower A section 2 is the spray void tower, comprise smoke inlet 6, absorbent inlet 8, ammonium sulfurous solution inlet E 9, ammonium sulfurous taphole F7, the ammonium sulfurous taphole F7 of described desulfurizing tower A section 2 is connected by ammonium sulfurous circulating pump O 20 with ammonium sulfurous solution inlet E 9; Described desulfurizing tower B section 3 is the random packing tower, comprises ammonium sulfurous solution inlet G11, ammonium sulfurous taphole H10, and the ammonium sulfurous taphole H 10 of described desulfurizing tower B section 3 is connected by ammonium sulfurous circulating pump P21 with ammonium sulfurous solution inlet G11; Described desulfurizing tower C section 4 is a regular packed tower, comprises ammonium sulfurous solution inlet I13, ammonium sulfurous taphole J12, and the ammonium sulfurous taphole J12 of described desulfurizing tower C section 4 is connected by ammonium sulfurous circulating pump Q 22 with ammonium sulfurous solution inlet I 13; Described desulfurizing tower D section 5 is a bubble column, comprises fresh water (FW) inlet 14, drain 15; Described air and liquid mixer 23 is positioned at desulfurizing tower A section 2 bottoms one side, comprises gas ammonia inlet 25, ammonium sulfurous solution inlet R 27, absorbent outlet 26; Described heat exchanger 24 is positioned at described ammonium sulfurous circulating pump O 20 outlets; Heat exchanger 24 inlets are connected by pipeline with described ammonium sulfurous circulating pump O 20 outlets.
Described desulfurizing tower B section 3 bottoms one side is provided with level stability device M 18, control desulfurizing tower B section 3 bottoms level, and desulfurizing tower B section 3 is connected by rising gas cap K 16 with described desulfurizing tower A section 2; Described desulfurizing tower C section 4 bottoms one side is provided with level stability device N 19, control desulfurizing tower C section 4 bottoms level, and desulfurizing tower C section 4 is connected by rising gas cap L17 with described desulfurizing tower B section 3; Described desulfurizing tower D section 5 directly is connected with described desulfurizing tower C section 4; The ammonium sulfurous taphole of described desulfurizing tower A section 2, desulfurizing tower B section 3 and desulfurizing tower C section 4 is provided with an ammonium sulfurous circulating pump respectively at least, guarantees the internal circulating load of each tower section ammonium sulfurous solution; Described air and liquid mixer 23 absorbents outlet 26 and described desulfurizing tower A section 2 absorbents inlet 8 are connected by pipeline, and the air and liquid mixer 23 ammonium sulfurous solution R 27 that enters the mouth exports with described heat exchanger 24 and is connected by pipeline; Described air and liquid mixer 23 mixes from the ammonium sulfurous solution of heat exchanger 24 and from the gas ammonia outside the battery limit (BL), mixed solution enters desulfurizing tower A section 2 bottoms as absorbent through absorbent inlet 8, the amount that adds gas ammonia by control is regulated desulfurizing tower A section 2 bottom pH values, the absorption reaction balance when increasing suddenly or reducing by adjusting pH value control exhaust gas volumn; Described heat exchanger 24 is used to shift out a large amount of heat that desulfurizing tower A section 2 produces because of absorption reaction.
The course of work of present embodiment is as follows: flue gas enters desulfurizing tower A section 2 (spray void tower) bottom through smoke inlet 6, and (content of sulfur dioxide is about 500～800g/Nm
3), the ammonium sulfurous solution counter current contacting of getting off with ammonium sulfurous circulating pump O 20 circulated sprinklings upwards, the sulfur dioxide in the gas falls into desulfurizing tower A section 2 bottoms with ammonium sulfurous solution reaction generation bisulfite ammonium salt solution.Desulfurizing tower A section 2 synthesis desulfurating rates can reach more than 99%, and this moment, content of sulfur dioxide was reduced to 15～30g/Nm
3, the flue gas of flue gas after spray absorbs enters desulfurizing tower B section 2 through rising gas cap K 16.Entering air and liquid mixer 23 from the gas ammonia outside the battery limit (BL) mixes with ammonium sulfurous solution from heat exchanger 24, mixed solution enters desulfurizing tower A section 2 bottoms by absorbent inlet 8, regulate desulfurizing tower A section 2 bottom pH values, the absorption reaction balance when increasing suddenly or reducing by adjusting pH value control exhaust gas volumn.Absorbing the heat that is generated in desulfurizing tower A section 2 is shifted out by the heat exchanger 24 that ammonium sulfurous circulating pump O20 exports.Part ammonium sulfurous solution enters air and liquid mixer 23 by ammonium sulfurous circulating pump O20 pressurization, and the ammonium sulfurous solution of high velocity jet is pumped into air and liquid mixer 23 with gas ammonia.Desulfurizing tower A section 2 bottom ammonium sulfurous concentration are controlled at 30～40%.
Enter the flue gas of desulfurizing tower B section 3 (random packing tower) and the ammonium sulfurous solution counter current contacting that ammonium sulfurous circulating pump 21 circulated sprinklings get off by rising gas cap K16, sulfur in smoke gas and ammonium sulfurous solution reaction generate the bisulfite ammonium salt solution and fall into desulfurizing tower B section 3 bottoms.Desulfurizing tower B section 3 bottoms level are by level stability device M 18 controls.Desulfurizing tower B section 3 desulfuration efficiencies can reach more than 98%, and the sulfur in smoke amount is reduced to 450～700mg/Nm
3, enter desulfurizing tower C section 4 through rising gas cap L 17 through the flue gas after the absorption of random packing tower.Desulfurizing tower B section 3 bottom ammonium sulfurous solution concentrations are controlled at 15～20%.
Gas cap L 17 continues to enter the flue gas of desulfurizing tower C section 4 (regular packed towers) and ammonium sulfurous solution counter current contacting that ammonium sulfurous circulating pump 22 circulated sprinklings get off further removes sulfur in smoke by rising, and the bisulfite ammonium salt solution that reaction generates enters desulfurizing tower C section 4 bottoms.The desulfuration efficiency of desulfurizing tower C section 4 can reach more than 97%, and this moment, amount of sulfur dioxide was reduced to 20～40mg/Nm
3, the flue gas after the regular packed tower desulfurization directly enters desulfurizing tower D section 4, and the concentration of desulfurizing tower C section bottom ammonium sulfurous solution is controlled at 8～15%.
Flue gas goes out desulfurizing tower C section 4 and upwards enters in the desulfurizing tower D section 5 (bubble column), contacts with fresh water (FW) inlet 14 fresh water (FW)s that spray, and little ammonia and the sulfur dioxide carried secretly in the washing tail gas, and solubilized is through the aerosol of each tower section generation.
Through desulfurization and washing step by step, synthesis desulfurating efficient can reach more than 99.999%, desulfurizing tower drain 15 contents of sulfur dioxide≤20mg/Nm
3, ammonia content≤7mg/Nm
3
In gas and the absorbent solution contact process, sulfur dioxide is absorbed by ammoniacal liquor, and following overall reaction takes place:
SO
2+2NH
3+H
2O＝(NH
4)
2SO
3
SO
2+(NH
4)
2SO
3+H
2O＝2NH
4HSO
3
NH
3+NH
4HSO
3＝(NH
4)
2SO
3
2(NH
4)
2SO
3+O
2＝2(NH
4)
2SO
4
For ammonia content in the prevention tail gas exceeds standard and the aerosol pollution, desulfurizing tower D section 5 is set to bubble column and can ammonia and the aerosol of carrying secretly in the tail gas be absorbed once more, reduces ammonia content, solution gas colloidal sol in the tail gas, makes the tail gas qualified discharge.
Present embodiment has the following advantages:
(1) the utility model device is a upper and lower settings, and floor space is little, and the desulfuration efficiency height can be handled the gas of content of sulfur dioxide more than 35%.
(2) the utility model desulfurization degree is more than 99.999%.
(3) the utility model tail gas outlet content of sulfur dioxide≤20mg/Nm
3, ammonia content≤7mg/Nm
3
(4) the utility model desulfurizing tower D section top is provided with fresh water (FW) spray, water balance in the control tower, and also desulfurizing tower D section is bubble column, can absorb small amounts of sulfur dioxide, gas ammonia and aerosol in the tail gas better, secondary pollution is avoided in no waste residue toxic emission.
Claims (4)
1. multistage combined desulfurizing device, comprise desulfurizing tower (1), ammonium sulfurous circulating pump O (20), ammonium sulfurous circulating pump P (21), ammonium sulfurous circulating pump Q (22), air and liquid mixer (23), heat exchanger (24), it is characterized in that: described desulfurizing tower comprises four sections of A, B, C, D, desulfurizing tower A section (2) is positioned at bottommost, desulfurizing tower B section (3) is positioned at desulfurizing tower A section (2) top, desulfurizing tower C section (4) is positioned at desulfurizing tower B section (3) top, and desulfurizing tower D section (5) is positioned at topmost; Described desulfurizing tower A section (2) is the spray void tower, comprise smoke inlet (6), absorbent inlet (8), ammonium sulfurous solution inlet E (9), ammonium sulfurous taphole F (7), the ammonium sulfurous taphole F (7) of described desulfurizing tower A section (2) is connected by ammonium sulfurous circulating pump O (20) with ammonium sulfurous solution inlet E (9); Described desulfurizing tower B section (3) is the random packing tower, comprise ammonium sulfurous solution inlet G (11), ammonium sulfurous taphole H (10), the ammonium sulfurous taphole H (10) of described desulfurizing tower B section (3) is connected by ammonium sulfurous circulating pump P (21) with ammonium sulfurous solution inlet G (11); Described desulfurizing tower C section (4) is a regular packed tower, comprise ammonium sulfurous solution inlet I (13), ammonium sulfurous taphole J (12), the ammonium sulfurous taphole J (12) of described desulfurizing tower C section (4) is connected by ammonium sulfurous circulating pump Q (22) with ammonium sulfurous solution inlet I (13); Described desulfurizing tower D section (5) is a bubble column, comprises fresh water (FW) inlet (14), drain (15); Described air and liquid mixer (23) is positioned at desulfurizing tower A section (2) bottom one side, comprises gas ammonia inlet (25), ammonium sulfurous solution inlet R (27), absorbent outlet (26); Described heat exchanger (24) is positioned at described ammonium sulfurous circulating pump O (20) outlet; Heat exchanger (24) inlet is connected by pipeline with described ammonium sulfurous circulating pump O (20) outlet.
2. according to the described a kind of multistage combined desulfurizing device of claim 1, it is characterized in that: described desulfurizing tower B section (3) bottom one side is provided with level stability device M (18), and desulfurizing tower B section (3) is connected by rising gas cap K (16) with described desulfurizing tower A section (2); Described desulfurizing tower C section (4) bottom one side is provided with level stability device N (19), and desulfurizing tower C section (4) is connected by rising gas cap L (17) with described desulfurizing tower B section (3); Described desulfurizing tower D section (5) directly is connected with described desulfurizing tower C section (4).
3. according to the described a kind of multistage combined desulfurizing device of claim 1, it is characterized in that: the ammonium sulfurous taphole of described desulfurizing tower A section (2), desulfurizing tower B section (3) and desulfurizing tower C section (4) is provided with an ammonium sulfurous circulating pump respectively at least.
4. according to the described a kind of multistage combined desulfurizing device of claim 1, it is characterized in that: described air and liquid mixer (23) absorbent outlet (26) is connected by pipeline with described desulfurizing tower A section (2) absorbent inlet (8), and air and liquid mixer (23) ammonium sulfurous solution inlet R (27) is connected by pipeline with described heat exchanger (24) outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205956396U CN201988324U (en) | 2010-11-05 | 2010-11-05 | Multi-section combined desulfurizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205956396U CN201988324U (en) | 2010-11-05 | 2010-11-05 | Multi-section combined desulfurizer |
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| Publication Number | Publication Date |
|---|---|
| CN201988324U true CN201988324U (en) | 2011-09-28 |
Family
ID=44664829
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| CN2010205956396U Expired - Fee Related CN201988324U (en) | 2010-11-05 | 2010-11-05 | Multi-section combined desulfurizer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430304A (en) * | 2011-11-09 | 2012-05-02 | 陕西煤业化工技术开发中心有限责任公司 | Circulating washing tower |
| CN103301732A (en) * | 2013-06-20 | 2013-09-18 | 义马煤业集团煤生化高科技工程有限公司 | Device and process for recycling and treating hydrogen sulfide-containing chemical acid waste gas |
| CN103506002A (en) * | 2013-10-11 | 2014-01-15 | 浙江洁达环保集团有限公司 | Two-section bicirculating spraying and padding composite absorption tower |
| CN106237824A (en) * | 2016-08-23 | 2016-12-21 | 陈淼 | A kind of minimum discharge desulfurization and dedusting eddy flow pallet spray tower |
| CN109078479A (en) * | 2018-09-05 | 2018-12-25 | 无锡中天固废处置有限公司 | A kind of compound bio method processing sewage plant exhaust device and waste gas processing method |
| CN109453633A (en) * | 2018-11-15 | 2019-03-12 | 江苏诺伊拓环保工程有限公司 | A kind of liquid collecting liter gas cap structure in flue gas desulfurization governing system |
| CN109621638A (en) * | 2018-12-07 | 2019-04-16 | 鲁西化工集团股份有限公司 | A kind of the deamination and desulfurization device and technique of conversion gas condensate liquid |
| CN110252091A (en) * | 2019-05-29 | 2019-09-20 | 华陆工程科技有限责任公司 | A kind of step absorption technique handling methylchlorosilane tail gas |
| CN111672283A (en) * | 2020-06-01 | 2020-09-18 | 中国石油化工股份有限公司 | Amine liquid desulfurizing tower |
-
2010
- 2010-11-05 CN CN2010205956396U patent/CN201988324U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430304A (en) * | 2011-11-09 | 2012-05-02 | 陕西煤业化工技术开发中心有限责任公司 | Circulating washing tower |
| CN103301732A (en) * | 2013-06-20 | 2013-09-18 | 义马煤业集团煤生化高科技工程有限公司 | Device and process for recycling and treating hydrogen sulfide-containing chemical acid waste gas |
| CN103506002A (en) * | 2013-10-11 | 2014-01-15 | 浙江洁达环保集团有限公司 | Two-section bicirculating spraying and padding composite absorption tower |
| CN103506002B (en) * | 2013-10-11 | 2016-03-09 | 浙江洁达环保集团有限公司 | Two-period form Two-way Cycle spraying filler composite absorption tower |
| CN106237824A (en) * | 2016-08-23 | 2016-12-21 | 陈淼 | A kind of minimum discharge desulfurization and dedusting eddy flow pallet spray tower |
| CN106237824B (en) * | 2016-08-23 | 2019-02-19 | 陈淼 | A kind of desulfurization and dust-removal method using minimum discharge desulfurization and dedusting eddy flow pallet spray tower |
| CN109078479A (en) * | 2018-09-05 | 2018-12-25 | 无锡中天固废处置有限公司 | A kind of compound bio method processing sewage plant exhaust device and waste gas processing method |
| CN109453633A (en) * | 2018-11-15 | 2019-03-12 | 江苏诺伊拓环保工程有限公司 | A kind of liquid collecting liter gas cap structure in flue gas desulfurization governing system |
| CN109621638A (en) * | 2018-12-07 | 2019-04-16 | 鲁西化工集团股份有限公司 | A kind of the deamination and desulfurization device and technique of conversion gas condensate liquid |
| CN110252091A (en) * | 2019-05-29 | 2019-09-20 | 华陆工程科技有限责任公司 | A kind of step absorption technique handling methylchlorosilane tail gas |
| CN110252091B (en) * | 2019-05-29 | 2021-11-23 | 华陆工程科技有限责任公司 | Cascade absorption process for treating methyl chlorosilane tail gas |
| CN111672283A (en) * | 2020-06-01 | 2020-09-18 | 中国石油化工股份有限公司 | Amine liquid desulfurizing tower |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20171105 |