CN105749731A - Efficient gas-liquid flow equilibrating device of square-box type desulfurizing tower - Google Patents
Efficient gas-liquid flow equilibrating device of square-box type desulfurizing tower Download PDFInfo
- Publication number
- CN105749731A CN105749731A CN201610176936.9A CN201610176936A CN105749731A CN 105749731 A CN105749731 A CN 105749731A CN 201610176936 A CN201610176936 A CN 201610176936A CN 105749731 A CN105749731 A CN 105749731A
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- China
- Prior art keywords
- gas
- desulfurizing tower
- current equalizer
- liquid
- high efficient
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- 239000007788 liquid Substances 0.000 title claims abstract description 69
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 238000013459 approach Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 229910052602 gypsum Inorganic materials 0.000 abstract description 2
- 239000010440 gypsum Substances 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 26
- 238000006477 desulfuration reaction Methods 0.000 description 16
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 14
- 230000023556 desulfurization Effects 0.000 description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 239000003500 flue dust Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/126—Semi-solid reactants, e.g. slurries
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention relates to an efficient gas-liquid flow equilibrating device of a square-box type desulfurizing tower. The efficient gas-liquid flow equilibrating device comprises a plurality of gas-liquid flow equilibrating plate modules which are horizontally arranged along the cross section of the desulfurizing tower and are connected into a whole, wherein each gas-liquid flow equilibrating plate module comprises a plurality of steel plates longitudinally arranged in parallel, the steel plates are arranged equidistantly, and each steel plate is a straight plate; triangular dustproof plates are arranged in the connection positions of the gas-liquid flow equilibrating plate modules. In the efficient gas-liquid flow equilibrating device, gas flow performs rotary disturbance, gas and liquids are more sufficiently contacted, the desulfurizing reaction area is increased, meanwhile, smoke and gypsum slurry in the gas and liquids are removed, and the dust removal purpose is achieved.
Description
Technical field
The present invention relates to a kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer.
Background technology
Along with China's economic development, electricity needs continues to increase, haze long lasting effect, controls PM2.5 and refer to agenda.Local government, electric power enterprise propose one after another " minimum discharge ", " near-zero release ", " reaching combustion engine discharge standard " construction or transformation requirement." minimum discharge " technology, scientific guidance Thermal Power Generation Industry sustainable development ultra-clean is discharged.
State Development and Reform Commission prints and distributes " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) " Air Pollutant Emission of keeping under strict control.Newly-built Thermal generation unit (is contained in and builds the unit having included country's construction of fire and electricity planning with project in) answers synchronized construction advanced person's high-efficiency desulfurization, denitration and dust removal installation, must not arrange gas bypass passage.Eastern region (11 provinces and cities such as Liaoning, Beijing, Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan) newly-built Thermal generation unit Air Pollutant Emission concentration basically reaches gas turbine group emission limit (namely under benchmark oxygen content 6% condition, flue dust, sulfur dioxide, discharged nitrous oxides concentration are respectively no higher than 10,35,50 milligrams/cubic metre).Middle part (8 provinces such as Heilungkiang, Jilin, Shanxi, Anhui, Hubei, Hunan, Henan, Jiangxi) new-built unit is in principle close to or up gas turbine group emission limit.Encourage west area new-built unit close to or up gas turbine group emission limit, support that the elimination of atmosphere pollution combination and cooperation is carried out in synchronization, reduce the pollutant emissions such as sulfur trioxide, hydrargyrum, arsenic.In tradition flue gas desulphurization system, desulfurization discharge efficiency is less than 95%, desulfurization outlet drain is that flue dust, sulfur dioxide emissioning concentration are respectively greater than 20,100 milligrams/cubic metre, but without reaching minimum discharge requirement (flue dust, sulfur dioxide emissioning concentration are respectively no higher than 10,35 milligrams/cubic metre).Existing apparatus is at desulfurization entrance SO2Concentration 3420mg/Nm3Time, desulfurization entrance dust concentration is 24mg/Nm3Time, desulfurization outlet SO2Concentration is 180mg/Nm3, outlet dust concentration is 20mg/Nm3, desulfuration efficiency is 95%, and desulfurizer exiting flue gas amount is 246200Nm3/h.Existing desulfurization equipment cannot meet minimum discharge outlet sulfur dioxide (SO2) < 20mg/Nm3, outlet dust concentration be 5mg/Nm3Emission request, namely existing desulphurization system can not meet minimum discharge operation emission request, therefore need to generator set desulfurization reaction unit be transformed.
Summary of the invention
For solving the problems referred to above, it is an object of the invention to provide a kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer.
It is an object of the invention to be achieved through the following technical solutions:
A kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer, described square chest type desulfurizing tower includes: gas approach, and it is arranged on the middle lower section of desulfurizing tower side；Exhanst gas outlet, it is arranged on the top of desulfurizing tower side；Slurry tank, it is arranged on the internal bottom side of desulfurizing tower, is positioned at the lower section of described gas approach；Spray portion, it is arranged on inside desulfurizing tower, is positioned at the top of described gas approach, and described spray portion is provided with 5 spraying layers, and each spraying layer is equipped with several nozzles；Gas-liquid current equalizer, it is along desulfurizing tower cross sectional arrangement, and is arranged between gas approach and ground floor spraying layer, including:
Several gas-liquid homogenizing plate modules, it is all along desulfurizing tower cross section tiled arrangements and connect into entirety, and each gas-liquid homogenizing plate module forms by the steel plate of several parallel longitudinal arrangements, described steel plate equidistant placement, and described steel plate is straight plate；The junction of described gas-liquid homogenizing plate module is provided with the anti-hawk of triangle.
Further, each gas-liquid homogenizing plate module is all long is 680mm for 3991mm, width, high 300mm.
Further, the spacing between described steel plate is 57mm.
Further, described high efficient gas and liquid current equalizer is made up of 2205 rustless steels.
Further, described steel plate thickness is 3～6mm.
Further, described steel plate thickness is 3mm.
Further, it is fixed on I-beam bottom the anti-hawk of described triangle.
Further, four angles of described gas-liquid current equalizer are separately fixed on the pillar of desulfurizing tower.
Further, it is provided with I-beam bottom described gas-liquid current equalizer and the intersection of desulfurizing tower surrounding wallboard.
Further, it is provided with the anti-hawk of triangle every the junction of 1,2,3 or 4 gas-liquid homogenizing plate modules.
The invention have the benefit that
Square chest type desulfurizing tower high efficient gas and liquid current equalizer of the present invention, makes entrance desulfurizing tower flue gas flow distribution more uniform, is more uniformly distributed improving gas-to-liquid contact, can guarantee that at desulfurization entrance SO2Concentration is 3420mg/Nm3Time, desulfurization entrance dust concentration is 24mg/Nm3Time, reach desulfuration efficiency and be not less than 99% and desulfurization outlet SO2Concentration is not more than 20mg/Nm3, outlet dust concentration is 5mg/Nm3Emission request, optimizes design, reduces cost, serves energy saving and cost lowering potentiation, has great economic implications.
Desulfurizing tower high efficient gas and liquid current equalizer of the present invention is when in desulfurizing tower, gas-liquid is passed through, violent disturbance mixing is produced in device, gas-liquid can be made on device top to form superposed layer, thus increasing gas-to-liquid contact surface area, extend the serosity time of staying and response time, make flue gas and slurry liquid contacts surface more abundant, so that desulfuration efficiency obtains raising 4%～5%.
The disturbance that in desulfurizing tower high efficient gas and liquid current equalizer of the present invention, air-flow rotates, makes gas-liquid more be fully contacted increase desulphurization reaction area, the flue dust in gas-liquid and gypsum slurries is removed simultaneously, reach dedusting purpose.
The advantage such as desulfurizing tower high efficient gas and liquid current equalizer of the present invention has desulfuration efficiency height, energy consumption is low, resistance is little (resistance only has 150Pa), simple in construction, maintenance are easy to maintenance, it is adaptable to the newly-built desulfurizing item of the middle and high sulfur coal that burns and desulfurization renovation and improving project.Described high efficient gas and liquid current equalizer makes flue gas flow field distribution more uniform, unbiased flow short-circuit dead band, and resistance is low, makes flue gas flow field distribution more uniform, and without bias current, resistance is low, alleviates the abrasion of upstream device, extends service life.
Accompanying drawing explanation
Fig. 1 is the structural representation of the desulfurizing tower being provided with gas-liquid current equalizer of the present invention；
Fig. 2 is the structural representation of gas-liquid current equalizer of the present invention；
Fig. 3 is the sectional drawing in 1-1 face in Fig. 2；
Fig. 4 is the sectional drawing in 2-2 face in Fig. 2；
Fig. 5 is the structural representation of gas-liquid homogenizing plate module junction of the present invention；
Fig. 6 is gas-liquid homogenizing plate module sectional drawing of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
A kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer, as it is shown in figure 1, described square chest type desulfurizing tower includes: gas approach, it is arranged on the middle lower section of desulfurizing tower side；Exhanst gas outlet, it is arranged on the top of desulfurizing tower side；Slurry tank, it is arranged on the internal bottom side of desulfurizing tower, is positioned at the lower section of described gas approach；Spray portion, it is arranged on inside desulfurizing tower, is positioned at the top of described gas approach, and described spray portion is provided with 5 spraying layers, and each spraying layer is equipped with several nozzles；Gas-liquid current equalizer, it is along desulfurizing tower cross sectional arrangement, and is arranged between gas approach and ground floor spraying layer, as in figure 2 it is shown, include:
Several gas-liquid homogenizing plate modules, it is all along desulfurizing tower cross section tiled arrangements and connect into entirety, as shown in Figure 6, each gas-liquid homogenizing plate module forms by the steel plate of several parallel longitudinal arrangements, described steel plate is straight plate, and described steel plate equidistant placement, is respectively provided with the spacing of 57mm between.As shown in Figure 3 and Figure 4, it is provided with the anti-hawk of triangle every the junction of 1,2,3 or 4 gas-liquid homogenizing plate modules, is fixed on I-beam bottom the anti-hawk of described triangle.When the junction of described gas-liquid homogenizing plate module is not provided with the anti-hawk of triangle, the spacing between described gas-liquid homogenizing plate module is 40mm.Four angles of described gas-liquid current equalizer are separately fixed on the pillar of desulfurizing tower.It is provided with I-beam bottom described gas-liquid current equalizer and the intersection of desulfurizing tower surrounding wallboard.There is between described gas-liquid current equalizer and desulfurizing tower surrounding wallboard the spacing of 20mm.
Each gas-liquid homogenizing plate module is all long is 680mm for 3991mm, width, and high 300mm, described steel plate thickness is 3mm.Described high efficient gas and liquid current equalizer is made up of 2205 rustless steels.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. a square chest type desulfurizing tower high efficient gas and liquid current equalizer, described square chest type desulfurizing tower includes: gas approach, and it is arranged on the middle lower section of desulfurizing tower side；Exhanst gas outlet, it is arranged on the top of desulfurizing tower side；Slurry tank, it is arranged on the internal bottom side of desulfurizing tower, is positioned at the lower section of described gas approach；Spray portion, it is arranged on inside desulfurizing tower, is positioned at the top of described gas approach, and described spray portion is provided with 5 spraying layers, and each spraying layer is equipped with several nozzles；Gas-liquid current equalizer, it is along desulfurizing tower cross sectional arrangement, and is arranged between gas approach and ground floor spraying layer, it is characterised in that including:
Several gas-liquid homogenizing plate modules, it is all along desulfurizing tower cross section tiled arrangements and connect into entirety, and each gas-liquid homogenizing plate module forms by the steel plate of several parallel longitudinal arrangements, described steel plate equidistant placement, and described steel plate is straight plate；The junction of described gas-liquid homogenizing plate module is provided with the anti-hawk of triangle.
2. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that each gas-liquid homogenizing plate module is all long is 680mm for 3991mm, width, high 300mm.
3. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that the spacing between described steel plate is 57mm.
4. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that described high efficient gas and liquid current equalizer is made up of 2205 rustless steels.
5. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that described steel plate thickness is 3～6mm.
6. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 5, it is characterised in that described steel plate thickness is 3mm.
7. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that be fixed on I-beam bottom the anti-hawk of described triangle.
8. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that four angles of described gas-liquid current equalizer are separately fixed on the pillar of desulfurizing tower.
9. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that be provided with I-beam bottom described gas-liquid current equalizer and the intersection of desulfurizing tower surrounding wallboard.
10. square chest type desulfurizing tower high efficient gas and liquid current equalizer according to claim 1, it is characterised in that be provided with the anti-hawk of triangle every the junction of 1,2,3 or 4 gas-liquid homogenizing plate modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610176936.9A CN105749731B (en) | 2016-03-24 | 2016-03-24 | A kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610176936.9A CN105749731B (en) | 2016-03-24 | 2016-03-24 | A kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105749731A true CN105749731A (en) | 2016-07-13 |
| CN105749731B CN105749731B (en) | 2019-04-30 |
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| CN201610176936.9A Active CN105749731B (en) | 2016-03-24 | 2016-03-24 | A kind of square chest type desulfurizing tower high efficient gas and liquid current equalizer |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201618515U (en) * | 2010-02-04 | 2010-11-03 | 安徽省元琛环保科技有限公司 | Desulfurizing tower |
| CN203564963U (en) * | 2013-10-25 | 2014-04-30 | 福建鑫泽环保设备工程有限公司 | Flue gas denitration airflow uniform-distribution device |
| CN204233970U (en) * | 2014-10-30 | 2015-04-01 | 江苏苏境电力科技有限责任公司 | The board-like airflow uniform distribution device of a kind of flue gas desulfurization demister |
| US20150182910A1 (en) * | 2014-01-02 | 2015-07-02 | Alstom Technology Ltd | Apparatus and method for evaporating waste water and reducing acid gas emissions |
| WO2015125559A1 (en) * | 2014-02-24 | 2015-08-27 | 三菱日立パワーシステムズ株式会社 | System for discharge gas treatment and method for discharge gas treatment |
| CN204601990U (en) * | 2015-05-18 | 2015-09-02 | 武汉凯迪电力环保有限公司 | A kind of dust-removing desulfurating apparatus |
| CA2939524A1 (en) * | 2014-04-15 | 2015-10-22 | Ihi Corporation | Desulfurization apparatus and exhaust gas processing system using the same |
| CN205586801U (en) * | 2016-03-24 | 2016-09-21 | 大唐环境产业集团股份有限公司 | High -efficient gas -liquid flow straightener of square chest formula desulfurizing tower |
-
2016
- 2016-03-24 CN CN201610176936.9A patent/CN105749731B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201618515U (en) * | 2010-02-04 | 2010-11-03 | 安徽省元琛环保科技有限公司 | Desulfurizing tower |
| CN203564963U (en) * | 2013-10-25 | 2014-04-30 | 福建鑫泽环保设备工程有限公司 | Flue gas denitration airflow uniform-distribution device |
| US20150182910A1 (en) * | 2014-01-02 | 2015-07-02 | Alstom Technology Ltd | Apparatus and method for evaporating waste water and reducing acid gas emissions |
| WO2015125559A1 (en) * | 2014-02-24 | 2015-08-27 | 三菱日立パワーシステムズ株式会社 | System for discharge gas treatment and method for discharge gas treatment |
| CA2939524A1 (en) * | 2014-04-15 | 2015-10-22 | Ihi Corporation | Desulfurization apparatus and exhaust gas processing system using the same |
| CN204233970U (en) * | 2014-10-30 | 2015-04-01 | 江苏苏境电力科技有限责任公司 | The board-like airflow uniform distribution device of a kind of flue gas desulfurization demister |
| CN204601990U (en) * | 2015-05-18 | 2015-09-02 | 武汉凯迪电力环保有限公司 | A kind of dust-removing desulfurating apparatus |
| CN205586801U (en) * | 2016-03-24 | 2016-09-21 | 大唐环境产业集团股份有限公司 | High -efficient gas -liquid flow straightener of square chest formula desulfurizing tower |
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| CN105749731B (en) | 2019-04-30 |
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Inventor after: Liu Yuxin Inventor after: Liu Chang Inventor after: Xia Shuang Inventor after: Wu Guojun Inventor after: Li Chunyu Inventor after: Li Yehong Inventor before: Liu Yuxin Inventor before: Liu Chang Inventor before: Lu Shengkuan Inventor before: Wu Guojun Inventor before: Peng Daijun |
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