CN105782724A - Gas automatic liquid sealing device - Google Patents
Gas automatic liquid sealing device Download PDFInfo
- Publication number
- CN105782724A CN105782724A CN201410792175.0A CN201410792175A CN105782724A CN 105782724 A CN105782724 A CN 105782724A CN 201410792175 A CN201410792175 A CN 201410792175A CN 105782724 A CN105782724 A CN 105782724A
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- China
- Prior art keywords
- cavity
- coal gas
- liquid
- inlet pipe
- smoke inlet
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- 239000007788 liquid Substances 0.000 title claims abstract description 126
- 238000007789 sealing Methods 0.000 title abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003546 flue gas Substances 0.000 claims abstract description 26
- 239000003034 coal gas Substances 0.000 claims description 56
- 239000000779 smoke Substances 0.000 claims description 41
- 239000000243 solution Substances 0.000 claims description 30
- 239000012530 fluid Substances 0.000 claims description 21
- 230000037452 priming Effects 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
The invention provides a gas automatic liquid sealing device. The gas automatic liquid sealing device comprises a flue gas leading part and a liquid sealing part, wherein the flue gas leading part comprises a first cavity filled with a solution and a flue gas inlet pipe, a flue gas inlet and a flue gas outlet are formed above the liquid level of the first cavity, the flue gas inlet pipe extends into the first cavity through the flue gas inlet, and the bottom end of the flue gas inlet pipe is positioned above the liquid level of the first cavity; the liquid sealing part comprises a second cavity filled with a solution and a liquid sealing structure, the space above the liquid level of the second cavity is communicated with the space above the liquid level of the first cavity by virtue of a pipeline, and when gas pressure in the first cavity and gas pressure in the second cavity are increased because the flue gas inlet pipe is closed when gas flows back from the flue gas outlet, the solution in the second cavity flows into the first cavity through the liquid sealing structure, so that the liquid level of the first cavity rises, and the solution enters the flue gas inlet pipe, thereby sealing the flue gas inlet pipe.
Description
Technical field
The present invention relates to a kind of coal gas automatic liquid seal apparatus, belong to gas pipeline liquid seal device technical field.
Background technology
Calorific value of gas refer to the combustion gas of certain volume or quality burn completely after institute can liberated heat.After the gas-fired that calorific value is high, liberated heat is many, and is susceptible to imperfect combustion, is unfavorable for the safe handling of user.For making calorific value of gas reach the requirement that user security uses, the method generally adopted is to be mixed in high heating value gas by low-BTU gas (such as coal gas, flue gas or noble gas etc.), it is thus achieved that coal gas that meet user security instructions for use, that calorific value of gas is relatively low.
A kind of conventional way is that the flue gas taken in chimney is mixed in the high heating value gas in gas piping, obtains the coal gas that calorific value is relatively low after mixing.Because in gas piping, gas pressure is higher, the flue gas pressures in chimney is relatively low, and above-mentioned low-calorie flue gas is blown in gas piping by the mode being now generally adopted booster fan.When running into emergency situations and causing booster fan to quit work (as having a power failure), the coal gas in gas piping can flow backwards along the flue gas input channel inputted by above-mentioned low heat value flue gas, and gas leak occurs.
Prior art is usually on gas pipeline and installs check-valves and dead electricity stop valve, and when booster fan quits work, check-valves and dead electricity stop valve are closed, and stop the coal gas in gas piping to blow back in chimney through flue gas input channel.But owing in gas piping, the pressure of coal gas is relatively big, above-mentioned check-valves and dead electricity stop valve are all again mechanical valve, it is easy to are not closed completely, cause gas leak, bring hidden danger to safety in production.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is in that to overcome the machinery valves such as the check-valves adopted in flue gas input channel in prior art, dead electricity stop valve to be easily not closed completely, cause gas leak, and then the defect of hidden danger is brought to safety in production, thus providing a kind of when booster fan quits work, can match with above-mentioned machinery valve, to completely seal off flue, thus avoiding the coal gas automatic liquid seal apparatus of gas leak.
For this, the present invention provides a kind of coal gas automatic liquid seal apparatus, including vent portion and wet seals, wherein said vent portion includes the first cavity equipped with solution and smoke inlet pipe, position on described first cavity liquid level forms smoke inlet, exhanst gas outlet, described smoke inlet pipe is extend in described first cavity by described smoke inlet, and the bottom of described smoke inlet pipe is on the liquid level of described first cavity；Described wet seals includes the second cavity equipped with solution and fluid-tight structure, pipeline communication is passed through with on the liquid level of described first cavity on the liquid level of described second cavity, air pressure in described first cavity and the second cavity when described coal gas flows backwards from described exhanst gas outlet because described smoke inlet pipe is closed air pressure raise time, solution in described second cavity flows in described first cavity by described fluid-tight structure, liquid level in described first cavity is made to rise and enter in described smoke inlet pipe, thus being blocked by described smoke inlet pipe.
Described fluid-tight structure includes:
Communicating pipe, there is described communicating pipe one end and the liquid outlet connected under the liquid level of described first cavity, and stretch into described second inside cavity, and higher than the liquid feeding end of liquid level in described second cavity；
Air pipe, described air pipe is set in the outside that described second inside cavity is divided that is positioned at of described communicating pipe, and have all the time with the air opening of atmosphere and all the time with at least one fluid-through port of described second cavity fluid connection.
Described first cavity is additionally provided with the pumping equipment for being discharged by described solution.
Described pumping equipment includes the leakage fluid dram being opened on described first cavity, and controls the draining valve of described leakage fluid dram break-make, and the position of described leakage fluid dram is lower than the lower end of described smoke inlet pipe.
Also include the priming device for injecting solution in described second cavity.
Described priming device includes the liquid injection port being opened on described second cavity.
Described second cavity is additionally provided with the redundant solution for being injected by described priming device and discharges the leveling device to control liquid level.
Described leveling device includes the liquid outlet being opened on described second cavity, and the height of described liquid outlet is lower than described liquid feeding end certain altitude h, described height h≤90mm.
The described smoke inlet pipe connected between flue gas source and described smoke inlet is provided with check-valves.
Described solution is water.
A kind of coal gas automatic liquid seal apparatus of the present invention has the advantage that
1. the coal gas automatic liquid seal apparatus of the present invention, it is arranged between gas piping and machinery valve, and match by designing vent portion and wet seals, work as fan trouble, when coal gas in gas piping occurs to flow backwards, closing function due to flue upper check valve, make the first cavity of vent portion and the second inside cavity of part wet seals because being filled with coal gas and air pressure rising, the solution in the second cavity is forced to be flowed into the first inside cavity by fluid-tight structure, the liquid level of solution making the first inside cavity raises, until the mouth of pipe of completely plugged firmly smoke inlet pipe, thus realizing tight sealing, it is thus able to prevent coal gas from leaking gas from the machinery valve of smoke inlet pipe upstream.This kind of design is ingenious, has used the pressure between coal gas and air to change flexibly, it is possible to effectively realize sealing, thus reducing potential safety hazard.
2. the coal gas automatic liquid seal apparatus of the present invention, above-mentioned fluid-tight structure is set and includes communicating pipe and air pipe, due to air pipe air opening all the time with atmosphere, and air pipe is provided with at least one fluid-through port of at least one and above-mentioned second cavity fluid connection, therefore when coal gas flows backwards the gas pressure rising caused in the first and second cavitys, the liquid of gas urges the second inside cavity enters in air pipe, further through being flowed into communicating pipe in the first cavity, liquid level in first cavity is raised, and final clogging smoke inlet pipe, thus realizing automatic fluid-tight.
3. the coal gas automatic liquid seal apparatus of the present invention, above-mentioned first cavity is additionally provided with the pumping equipment for being discharged by solution, above-mentioned pumping equipment includes the leakage fluid dram being opened on the first cavity, and the draining valve of control leakage fluid dram break-make, and the position of above-mentioned leakage fluid dram is lower than the lower end of smoke inlet pipe；When fluid-tight is complete, when needing to restart booster fan, in order to unobstructed for flue gas drying is input in gas piping, it is accomplished by discharging the solution of the first inside cavity, now have only to open above-mentioned draining valve, unnecessary solution can be discharged from the leakage fluid dram being arranged on the first cavity wall, very convenient, after discharge opeing, close draining valve, one is avoid smoke spillage, and two is when causing booster fan again to stop operating because of reasons such as power failures, and the automatic fluid-tight function of coal gas automatic liquid seal apparatus of the present invention can continue to play a role.
4. the coal gas automatic liquid seal apparatus of the present invention, second cavity is additionally provided with the priming device for injecting solution, concrete, priming device may be configured as the liquid injection port being opened on the second cavity, after a fluid-tight, the liquid of the second inside cavity can reduce, if without liquid, just it is likely to the next self-sealing effect of impact, above-mentioned priming device is now set, and after automatic fluid-tight function enables, add enough liquid by priming device every time, thereby may be ensured that coal gas automatic liquid seal apparatus of the present invention can be reused, and ensure that good sealing effectiveness.
5. the coal gas automatic liquid seal apparatus of the present invention, second cavity is additionally provided with for the redundant solution injected by above-mentioned priming device being discharged the leveling device to control the second inside cavity liquid level, arranging the liquid outlet that above-mentioned leveling device includes being opened on the second cavity, the height of liquid outlet is lower than liquid feeding end certain altitude h；It is utilize the pressure differential between gas pressure and atmospheric pressure owing to the present invention realizes the principle of automatic fluid-tight, so the height h between the liquid level in the second cavity and the liquid feeding end of communicating pipe is required, enter in air pipe certain altitude because only that oppress the solution in the second cavity when above-mentioned pressure differential and can enter into from liquid feeding end inside communicating pipe, and input abundant liquid and enter into the first inside cavity, the effect of automatic fluid-tight can be played, therefore arrange above-mentioned leveling device be easy to by above-mentioned liquid injection port to the second inside cavity inject liquid time level control to the second inside cavity, thus ensureing sealing effectiveness.
6. the coal gas automatic liquid seal apparatus of the present invention, above-mentioned solution can be water, it is also possible to is that other are capable of the liquid of effect of the present invention.
Accompanying drawing explanation
Fig. 1 is the coal gas automatic liquid seal apparatus installation site schematic diagram in the application of the present invention.
Fig. 2 is the coal gas automatic liquid seal apparatus of the present invention structural representation when the normal feed status of coal gas.
Fig. 3 is the coal gas automatic liquid seal apparatus of the present invention structural representation when coal gas refluence sealing state.
In figure:
1-coal gas automatic liquid seal apparatus, 2-the second cavity, 21-liquid injection port, 211-fluid injection valve, 22-liquid outlet, 3-the first cavity, 30-smoke inlet, 31-smoke inlet pipe, 32-smoke inlet end, 33-draining valve, 4-exhanst gas outlet, 5-communicating pipe, 51-liquid feeding end, 52-liquid outlet, 6-air pipe, 61-air opening, 62-fluid-through port, 7-pipeline；
100-chimney, 101-conveyance conduit, 102-check-valves, 103-booster fan, 104-gate valve, 105-gas piping.
Detailed description of the invention
Below in conjunction with accompanying drawing, a kind of coal gas automatic liquid seal apparatus provided by the invention is described in further detail.
Embodiment 1
The present embodiment provides a kind of coal gas automatic liquid seal apparatus, its installation site is as shown in Figure 1, flue gas in chimney 100 is under the swabbing action of booster fan 103, booster fan 103 inside is entered into through conveyance conduit 101, check-valves 102, coal gas automatic liquid seal apparatus 1, after pressurization, being blown in gas piping 105 through gate valve 104, the coal gas higher with calorific value mixes, thus obtaining the coal gas being suitable to life use that calorific value is relatively low.
When causing booster fan 103 to stop operating because of cause specifics such as power-off, owing to the gas pressure in gas piping 105 is bigger, coal gas can be greasy flue gas input path flow backwards, owing to check-valves 102 is mechanical valve, cannot ensure to fully seal, once coal gas leaks, will bring considerable risk to safety in production, it is therefore desirable to coal gas automatic liquid seal apparatus 1 was set before check-valves 102.
The coal gas automatic liquid seal apparatus of this enforcement is as shown in Figure 2, including vent portion and wet seals, wherein vent portion includes the first cavity 3 equipped with solution and smoke inlet pipe 31, in the position molding of the first cavity 3 ullage or be provided with smoke inlet 30 and exhanst gas outlet 4, it is internal that smoke inlet pipe 31 extend into the first cavity 3 by smoke inlet 30, and the bottom of smoke inlet pipe 31 is positioned on the liquid level within the first cavity 3.
Wet seals includes the second cavity 2 equipped with solution and fluid-tight structure, liquid level above section within second cavity 2 and the liquid level above part within the first cavity 3 are by pipeline 7 gas communication, air pressure in the first cavity 3 and the second cavity 2 is when when above-mentioned coal gas flows backwards from exhanst gas outlet 4, because smoke inlet pipe 31 is closed by check-valves 102, air pressure raises, solution in second cavity 2 flows in the first cavity 3 by above-mentioned fluid-tight structure, make the liquid level in the first cavity 3 increase and enter in smoke inlet pipe 31, thus smoke inlet pipe 31 is blocked, realization fully seals.
Above-mentioned fluid-tight structure includes communicating pipe 5 and air pipe 6, wherein has one end and the liquid outlet 52 connected under the liquid level of the first cavity 3 communicating pipe 5, and it is internal to stretch into the second cavity 2, and higher than the liquid feeding end 51 of liquid level in the second cavity 2；
Air pipe 6 be set in communicating pipe 5 be positioned at second cavity 2 part outside, and have all the time with the air opening 61 of atmosphere and all the time with at least one fluid-through port 62 of the second cavity 2 fluid connection.
Above-mentioned first cavity 3 is additionally provided with the pumping equipment for being discharged by solution.Above-mentioned pumping equipment includes the leakage fluid dram being opened on the first cavity 3 and the draining valve 33 of the upper leakage fluid dram break-make of control, and the position of leakage fluid dram is lower than the lower end of smoke inlet pipe 31.
The automatic water sealing arrangement for coal gas of the present invention, also includes the priming device for injecting solution in the second cavity 2.Above-mentioned priming device includes the liquid injection port 21 being opened on the second cavity 2.Liquid injection port 21 is provided with homepage valve 211, closes after fluid injection, be used for ensureing the second cavity 2 inner sealing.
Above-mentioned second cavity 2 is additionally provided with the redundant solution for being injected by priming device and discharges the leveling device to control liquid level.Above-mentioned leveling device includes the liquid outlet 22 being opened on the second cavity 2, and the height of liquid outlet 2 is lower than the liquid feeding end 51 certain altitude h of communicating pipe 5, height h≤90mm.
nullAs shown in Figure 3，When causing booster fan 103 to quit work because of reasons such as power failures，Check-valves 102 cuts out，Now coal gas enters into the space of more than the first cavity 3 and the second cavity 2 internal liquid level from gas piping 105 through exhanst gas outlet 4 refluence，Owing to space more than first cavity 3 and the second cavity 2 internal liquid level does not communicate with the direct gas in the external world，Coal gas can oppress the liquid level within the first cavity 3 and the second cavity 2 simultaneously，The internal certain altitude of air pipe 6 is entered into through fluid-through port 62 after liquid pressurized within second cavity 2，Owing to the height between liquid feeding end 51 and second cavity 2 internal liquid level of communicating pipe 5 is less than h，Liquid in second cavity 2 can enter communicating pipe 5 from liquid feeding end 51 and further flow into the first cavity 3，Liquid level within first cavity 3 gradually rises，Fully seal thus the smoke inlet end 32 of smoke inlet pipe 31 being blocked closing realization.
When needs restart booster fan 103 input flue gas to gas piping 105 time, open draining valve 33 and internal for first cavity 3 liquid that seal smoke inlet pipe 31 discharged, after discharge, close draining valve 33；Open fluid injection valve 211, injecting liquid by liquid injection port 21 to the second cavity 2 is internal, until stopping injecting when the liquid injected is discharged from liquid outlet 22, and closing fluid injection valve 211 and liquid outlet 22.After completing aforesaid operations, can opening booster fan 103 and work, when there is fortuitous event, the coal gas automatic liquid seal apparatus 1 of the present invention still can play the function of automatic fluid-tight, it is to avoid gas leak, it is ensured that safety in production.
In the present embodiment, above-mentioned solution is water, and it is equally possible that other can meet the liquid realizing the object of the invention.
Obviously, above-described embodiment is only for clearly demonstrating example, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.And the apparent change thus extended out or variation are still among the protection domain of the invention.
Claims (10)
1. a coal gas automatic liquid seal apparatus, it is characterized in that: include vent portion and wet seals, wherein said vent portion includes the first cavity (3) equipped with solution and smoke inlet pipe (31), position on described first cavity (3) liquid level forms smoke inlet (30), exhanst gas outlet (4), described smoke inlet pipe (31) is extend in described first cavity (3) by described smoke inlet (30), and the bottom of described smoke inlet pipe (31) is on the liquid level of described first cavity (3)；Described wet seals includes the second cavity (2) equipped with solution and fluid-tight structure, connected by pipeline (7) with on the liquid level of described first cavity (3) on the liquid level of described second cavity (2), air pressure in described first cavity (3) and the second cavity (2) when described coal gas flows backwards from described exhanst gas outlet (4) because described smoke inlet pipe (31) is closed air pressure raise time, solution in described second cavity (2) flows in described first cavity (3) by described fluid-tight structure, make the interior liquid level of described first cavity (3) increase and enter in described smoke inlet pipe (31), thus described smoke inlet pipe (31) is blocked.
2. coal gas automatic liquid seal apparatus according to claim 1, it is characterised in that: described fluid-tight structure includes:
Communicating pipe (5), there is described communicating pipe (5) one end and the liquid outlet (52) connected under the liquid level of described first cavity (3), and it is internal to stretch into described second cavity (2), and higher than the liquid feeding end (51) of the interior liquid level of described second cavity (2)；
Air pipe (6), described air pipe (6) be set in described communicating pipe (5) be positioned at described second cavity (2) part outside, and have all the time with the air opening (61) of atmosphere and all the time with at least one fluid-through port (62) of described second cavity (2) fluid connection.
3. coal gas automatic liquid seal apparatus according to claim 2, it is characterised in that: described first cavity (3) is additionally provided with the pumping equipment for being discharged by described solution.
4. coal gas automatic liquid seal apparatus according to claim 3, it is characterized in that: described pumping equipment includes the leakage fluid dram being opened on described first cavity (3), and control the draining valve (33) of described leakage fluid dram break-make, and the position of described leakage fluid dram is lower than the lower end of described smoke inlet pipe (31).
5. the coal gas automatic liquid seal apparatus according to any one of claim 2-4, it is characterised in that: also include the priming device for injecting solution in described second cavity (2).
6. coal gas automatic liquid seal apparatus according to claim 5, it is characterised in that: described priming device includes the liquid injection port (21) being opened on described second cavity (2).
7. the coal gas automatic liquid seal apparatus according to claim 5 or 6, it is characterised in that: described second cavity (2) is additionally provided with the redundant solution for being injected by described priming device and discharges the leveling device to control liquid level.
8. coal gas automatic liquid seal apparatus according to claim 7, it is characterized in that: described leveling device includes the liquid outlet (22) being opened on described second cavity (2), the height of described liquid outlet (2) is lower than described liquid feeding end (51) certain altitude h, described height h≤90mm.
9. coal gas automatic liquid seal apparatus according to claim 1, it is characterised in that: flue gas source and described smoke inlet pipe (31) are provided with check-valves (102).
10. the coal gas automatic liquid seal apparatus according to any one of claim 1-9, it is characterised in that: described solution is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410792175.0A CN105782724B (en) | 2014-12-19 | 2014-12-19 | A kind of automatic liquid seal device of coal gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410792175.0A CN105782724B (en) | 2014-12-19 | 2014-12-19 | A kind of automatic liquid seal device of coal gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105782724A true CN105782724A (en) | 2016-07-20 |
| CN105782724B CN105782724B (en) | 2018-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410792175.0A Expired - Fee Related CN105782724B (en) | 2014-12-19 | 2014-12-19 | A kind of automatic liquid seal device of coal gas |
Country Status (1)
| Country | Link |
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| CN (1) | CN105782724B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828122A (en) * | 2006-04-18 | 2006-09-06 | 杨裕能 | Automatic gas leakage preventing device |
| JP2010151265A (en) * | 2008-12-26 | 2010-07-08 | Nippon Steel Corp | Water sealed gas holder and method of closing water seal valve of the water sealed gas holder |
| CN201810993U (en) * | 2010-09-19 | 2011-04-27 | 钦州永盛锰业有限公司 | Electric furnace gas conduit non-return water seal device |
| CN201858526U (en) * | 2009-12-02 | 2011-06-08 | 青岛天人环境股份有限公司 | Positive/negative pressure protection device with water condensation function |
| CN202852856U (en) * | 2012-09-29 | 2013-04-03 | 山东铁雄冶金科技有限公司 | Burning device and tempering water seal device thereof |
-
2014
- 2014-12-19 CN CN201410792175.0A patent/CN105782724B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828122A (en) * | 2006-04-18 | 2006-09-06 | 杨裕能 | Automatic gas leakage preventing device |
| JP2010151265A (en) * | 2008-12-26 | 2010-07-08 | Nippon Steel Corp | Water sealed gas holder and method of closing water seal valve of the water sealed gas holder |
| CN201858526U (en) * | 2009-12-02 | 2011-06-08 | 青岛天人环境股份有限公司 | Positive/negative pressure protection device with water condensation function |
| CN201810993U (en) * | 2010-09-19 | 2011-04-27 | 钦州永盛锰业有限公司 | Electric furnace gas conduit non-return water seal device |
| CN202852856U (en) * | 2012-09-29 | 2013-04-03 | 山东铁雄冶金科技有限公司 | Burning device and tempering water seal device thereof |
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| Publication number | Publication date |
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| CN105782724B (en) | 2018-03-06 |
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Effective date of registration: 20220622 Address after: 3007, Hengqin international financial center building, No. 58, Huajin street, Hengqin new area, Zhuhai, Guangdong 519031 Patentee after: New founder holdings development Co.,Ltd. Patentee after: SUZHOU SUXIN SPECIAL STEEL Co.,Ltd. Patentee after: JIANGSU SUZHOU STEEL GROUP Co.,Ltd. Address before: 100871, Beijing, Haidian District Cheng Fu Road 298, founder building, 9 floor Patentee before: PEKING UNIVERSITY FOUNDER GROUP Co.,Ltd. Patentee before: SUZHOU SUXIN SPECIAL STEEL Co.,Ltd. Patentee before: JIANGSU SUZHOU STEEL GROUP Co.,Ltd. |
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Granted publication date: 20180306 |