CN106673101A - Deep treatment method and system for high-salinity desulfurization wastewater - Google Patents
Deep treatment method and system for high-salinity desulfurization wastewater Download PDFInfo
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- CN106673101A CN106673101A CN201611233561.1A CN201611233561A CN106673101A CN 106673101 A CN106673101 A CN 106673101A CN 201611233561 A CN201611233561 A CN 201611233561A CN 106673101 A CN106673101 A CN 106673101A
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- waste water
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- desulfurization wastewater
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/141—Wind power
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a deep treatment method and system for high-salinity desulfurization wastewater. The system comprises five parts, including a wastewater delivery device, a gas path delivery device, a heat source device, a concentrated solution and crystal substance recovery device and a droplet size measuring device, wherein the wastewater delivery device comprises a wastewater storage tank and a centrifugal pump; the gas path delivery device comprises an air compressor, a mixing chamber and a nozzle; the heat source device comprises an air blower and low-temperature exhaust heat utilization equipment; the concentrated solution and crystal substance recovery device comprises a drying tower, a screw distribution slide rail, a cyclone centrifuge, a salt recovery tank, a sieve plate, a concentrated solution storage tank and a preheater; the droplet size measuring device comprises an observation window, a droplet size measurer and a computer. The system integrates high-salinity desulfurization wastewater atomization evaporation, droplet size detection and concentrated solution and crystal substance recovery functions, the operation is convenient, the temperature in a plant is evenly distributed, the evaporation effect is good, and operation energy consumption is low.
Description
Technical field
The present invention relates to technical field of waste water processing, more particularly to a kind of saliferous Deep Processing Method of Waste Water from FGD high and it is
System.
Background technology
Coal accounts for 66% in China's primary energy consumption, and about 3,700,000,000 tons of consumption of coal total amount accounts for worldwide coal consumption
50% or so of amount.70%, the 85% of sulfur dioxide (SO2) emissions, the 67% of discharged nitrous oxides of national smoke-dust discharge is all originated from
Fossil energy burning based on coal, is the principal element for influenceing atmosphere quality.
Limestone-gypsum method and the ammonia process of desulfurization are the most widely used sulfur removal technologies of petrochemical enterprise, and it is useless that it is produced
Water contains plurality of heavy metal ion and solid suspension, and directly discharge has extremely strong pollution to environment.
Conventional desulfurization wastewater mainly uses chemical precipitation method, but cannot effectively remove the chlorion and sulfate radical in waste water
Ion, it is impossible to realize minimum discharge.Other processing methods include NF membrane retention waste water in dissolving salt, but because film easily
Pollute and relatively costly, be not used widely；Direct combustion method, the discarded object of generation is less, but is only applicable to water content
There is the situation of a large amount of combustible components in less and water.
The content of the invention
In order to solve the above problems, the invention provides a kind of saliferous Deep Processing Method of Waste Water from FGD high and system, should
System produces atomization waste liquid by desulfurization wastewater, gas circuit conveying device, through evaporation process in drying tower, journey is atomized by on-line checking
Degree, adjusts desulfurization wastewater treatment system operational factor, system is reached optimal operational condition.
The technical problems to be solved by the invention are realized using following technical scheme.
A kind of saliferous Deep Processing Method of Waste Water from FGD high and system, it is characterised in that including waste water conveying device, gas circuit
Conveying device, heat power supply device, concentrate and crystal retracting device, five parts of drop size measurement device.The waste water is defeated
Device, gas circuit conveying device, heat power supply device, concentrate and crystal retracting device is sent to be connected with valve by pipeline.It is described useless
Water conveying device includes waste water reservoir (1), centrifugal pump (2)；The gas circuit conveying device includes air compressor (7), mixing
Room (5), nozzle (6)；The heat power supply device includes air blower (8), low temperature heat equipment (9)；The concentrate and crystallization
Thing retracting device includes drying tower (12), Spiral distribution slide rail (13), cyclone centrifuges (14), salt accumulator tank (17), sieve plate
(21), concentration liquid storage tank (22), preheater (24)；The drop size measurement device includes that observation window (18), drop size are surveyed
Amount instrument (19), computer (20).
Further, the waste water reservoir (1) is connected with centrifugal pump (2) by pipeline；Centrifugal pump (2) efferent duct
Include glass rotameter (3) and pressure gauge (4) on road；The mixing chamber (5) ensures that desulfurization wastewater and the abundant of air are mixed
Close.
Further, the air compressor (7) is connected by pipeline with mixing chamber (5), by adjust compressed air with
The gas liquid ratio of desulfurization wastewater, after being sufficiently mixed, desulfurization wastewater fog is produced by nozzle (6).
Further, the low temperature heat equipment (9) using heat exchanger including directly heating air or utilizes machine
Tool compression heat pump, absorption heat transformer reclaim industrial waste gas waste heat, heat air, reducing energy consumption；The low temperature heat
Equipment (9) is blown by air blower (8), and is connected with gas flowmeter (10), gas flowmeter (10) and thermal source incidence end
(11) it is connected, the thermal source incidence end (11) sends into hot blast in circular tangent form, produces spiralling hot-fluid.
Further, the Spiral distribution slide rail (13) is connected using the spherical fixture of embedded slide rail with nozzle (6), nozzle
The desulfurization wastewater fog of generation completes evaporation in drying tower (12)；Drying tower (12) upper end outlet containing a small amount of salt grain
Gas is separated by cyclone centrifuges (14), and gas is taken away by air-introduced machine (15), and a small amount of salt grain is collected into salt accumulator tank
(17)；Drying tower (12) lower end through sieve plate (21) separation concentrated solution and salt, by the crystalline salt by evaporation that Action of Gravity Field falls
Particle is separated by cyclone centrifuges (14), by outlet valve (16), is collected into salt accumulator tank (17)；Sieve plate (21) is leached
Concentrate is flowed into concentration liquid storage tank (22) by drying tower bottom tapered exit, and waste water liquid storage is led back by circulating pump (23)
Groove is circulated treatment in (1).
Further, the nozzle (6) by Spiral distribution slide rail (13) can free adjustment work position, be capable of achieving to
It is upper, downwards and the direction such as spiral sink flow direction is tangent injection, make uniform distribution of temperature field in tower, thermal source is abundant
Utilize, injector spacing about 0.4m, the number of nozzle (6) depends on the treating capacity of desulfurization wastewater and the flow of hot-air；The spiral shell
Rotation distribution slide rail (13) includes fluoroplastics, stainless steel and corrosion resistance composite, the cloth of Spiral distribution slide rail (13) top nozzle
Mode is put, using upper and lower interlaced arrangement.
Further, described drop size measurement instrument (19) one end is connected with observation window (18), the other end and computer
(20) it is connected, the macro-effect that the observation window (18) is atomized for observed drop；The drop size measurement instrument (19) uses
Laser-Doppler (LDV) system or high-speed motion picture camera, measure diameter and the distribution of drop, and drop size is by adjusting air pressure
Contracting machine (8) enters the gas liquid ratio of mixing chamber (5), and the size of mouth atomized drop is touched in regulation, is controlled below 50 μm；The computer
(20) analyze and process the data that measuring instrument is used.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is saliferous Deep Processing Method of Waste Water from FGD high and system flow schematic diagram.
In Fig. 1,1. waste water reservoir, 2. centrifugal pump, 3. glass rotameter, 4. pressure gauge, 5. mixing chamber, 6. spray
It is mouth, 7. air compressor, 8. air blower, 9. low temperature heat equipment, 10. gas flowmeter, 11. thermal source incidence ends, 12. dry
Dry tower, 13. Spiral distribution slide rails, 14. cyclone centrifuges, 15. air-introduced machines, 16. outlet valves, 17. salt accumulator tanks, 18. observations
Window, 19. drop size measurement instrument, 20. computers, 21. sieve plates, 22. concentration liquid storage tanks, 23. circulating pumps, 24. surge tanks, 25.
Preheater, 26. condensation water storage tanks.
Specific embodiment
In Fig. 1, waste water reservoir (1) is connected with centrifugal pump (2) by pipeline；Centrifugal pump (2) is opened, by glass
Spinner flowmeter (3) is adjusted into flow quantity with the reading of pressure gauge (4), and desulfurization wastewater and air are carried out into mixing chamber (5)
Be sufficiently mixed.Start air compressor (7), regulation compressed air is 2 with the gas liquid ratio of desulfurization wastewater：1, after being sufficiently mixed,
Desulfurization wastewater fog is produced by nozzle (6).
Start air blower (8) and low temperature heat equipment (9), low temperature heat equipment (9) is changed including directly utilizing
Hot device heating air reclaims industrial waste gas waste heat using mechanical compression type heat pump, absorption heat transformer, heats air, reduces
Energy consumption.The wind that air blower (8) is sent out is heated by low temperature heat equipment (9), is adjusted by gas flowmeter (10)
Air inflow, from thermal source incidence end (11) in circular tangent form, into drying tower, produces spiralling hot-fluid, and heating is steamed
Hair waste liquid fog.
Well mixed gas-liquid sprays from nozzle (6), and the position of nozzle (6) is by Spiral distribution slide rail (13) and embedded cunning
The spherical fixture of rail is fixed, and the desulfurization wastewater fog that nozzle is produced completes evaporation, drying tower in drying tower (12)
(12) gas of the upper end outlet treatment containing a small amount of salt grain is separated by cyclone centrifuges (14), and gas is taken out by air-introduced machine (15)
Walk, a small amount of salt grain is collected into salt accumulator tank (17)；Drying tower (12) lower end through sieve plate (21) separation concentrated solution and salt, by weight
The evaporative crystallization salt particle that power effect falls is separated by cyclone centrifuges (14), by outlet valve (16), is collected into salt and is returned
Receive groove (17)；The concentrate that sieve plate (21) is leached is flowed into concentration liquid storage tank (22) by drying tower bottom tapered exit, is passed through
Circulating pump (23) is circulated treatment in leading back waste water reservoir (1).
In specific implementation, injector spacing about 0.4m, the number of nozzle (6) depends on the treating capacity and hot-air of desulfurization wastewater
Flow；Spiral distribution slide rail (13) includes fluoroplastics, stainless steel and corrosion resistance composite, Spiral distribution slide rail (13)
The arrangement of top nozzle, using upper and lower interlaced arrangement.
Start drop size measurement instrument (19), drop size measurement instrument (19) one end is connected with observation window (18), the other end
It is connected with computer (20), the macro-effect that observation window (18) is atomized for observed drop.Drop size measurement instrument (19) is used
Laser-Doppler (LDV) system or high-speed motion picture camera, measure diameter and the distribution of drop, and drop size is by adjusting air pressure
Contracting machine (8) enters the gas liquid ratio of mixing chamber (5), and the size of mouth atomized drop is touched in regulation, is controlled below 50 μm, computer (20)
The data that analysis and treatment measuring instrument are used.
With above-mentioned according to desirable embodiment of the invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to its technical scope is determined according to right.
Claims (7)
1. a kind of saliferous Deep Processing Method of Waste Water from FGD high and system, it is characterised in that defeated including waste water conveying device, gas circuit
Send device, heat power supply device, concentrate and crystal retracting device, five parts of drop size measurement device, the waste water conveying
Device, gas circuit conveying device, heat power supply device, concentrate and crystal retracting device are connected by pipeline with valve, the waste water
Conveying device includes waste water reservoir (1), centrifugal pump (2)；The gas circuit conveying device includes air compressor (7), mixing chamber
(5), nozzle (6)；The heat power supply device includes air blower (8), low temperature heat equipment (9)；The concentrate and crystal
Retracting device includes drying tower (12), Spiral distribution slide rail (13), cyclone centrifuges (14), salt accumulator tank (17), sieve plate
(21), concentration liquid storage tank (22), preheater (24)；The drop size measurement device includes that observation window (18), drop size are surveyed
Amount instrument (19), computer (20).
2. saliferous Deep Processing Method of Waste Water from FGD high as claimed in claim 1 and system, it is characterised in that the waste water storage
Liquid bath (1) is connected with centrifugal pump (2) by pipeline；On centrifugal pump (2) output pipe include glass rotameter (3) with
Pressure gauge (4)；The mixing chamber (5) ensures being sufficiently mixed for desulfurization wastewater and air.
3. saliferous Deep Processing Method of Waste Water from FGD high as claimed in claim 1 and system, it is characterised in that the air pressure
Contracting machine (7) is connected by pipeline with mixing chamber (5), by adjusting the gas liquid ratio of compressed air and desulfurization wastewater, after being sufficiently mixed,
Desulfurization wastewater fog is produced by nozzle (6).
4. saliferous Deep Processing Method of Waste Water from FGD high as claimed in claim 1 and system, it is characterised in that more than the low temperature
Heat utilization equipment (9) using heat exchanger including directly heating air or being returned using mechanical compression type heat pump, absorption heat transformer
Industry of knocking off waste gas residual heat, heats air, reducing energy consumption；The low temperature heat equipment (9) is blown by air blower (8), and
Be connected with gas flowmeter (10), gas flowmeter (10) is connected with thermal source incidence end (11), the thermal source incidence end (11) with
Circular tangent form, sends into hot blast, produces spiralling hot-fluid.
5. saliferous Deep Processing Method of Waste Water from FGD high as claimed in claim 1 and system, it is characterised in that：The spiral point
Cloth slide rail (13) is connected using the spherical fixture of embedded slide rail with nozzle (6), and the desulfurization wastewater fog that nozzle is produced is in drying tower
(12) evaporation is completed in；Steam buffered device (24) voltage stabilizing of drying tower (12) upper end outlet, buffer (24) and preheating
Device (25) is connected, and preheater (25) is heated to the stoste that centrifugal pump (2) is pumped out, preheater (25) and reuse water storage tank (26)
It is connected；Drying tower (12) lower end through sieve plate (21) separation concentrated solution and salt, by the crystalline salt by evaporation that Action of Gravity Field falls
Particle is separated by cyclone centrifuges (14), by outlet valve (16), is collected into salt accumulator tank (17)；Sieve plate (21) is leached
Concentrate is flowed into concentration liquid storage tank (22) by drying tower bottom tapered exit, and waste water liquid storage is led back by circulating pump (23)
Groove is circulated treatment in (1).
6. saliferous Deep Processing Method of Waste Water from FGD high as claimed in claim 1 and system, it is characterised in that：The nozzle
(6) can free adjustment work position, achievable upward, downward and spiral hot-fluid stream by Spiral distribution slide rail (13)
The injection in the direction such as dynamic direction is tangent, makes uniform distribution of temperature field in tower, and thermal source makes full use of, injector spacing about 0.4m, nozzle
(6) number depends on the treating capacity of desulfurization wastewater and the flow of hot-air；The Spiral distribution slide rail (13) including fluoroplastics,
Stainless steel and corrosion resistance composite, the arrangement of Spiral distribution slide rail (13) top nozzle, using upper and lower interlaced arrangement.
7. saliferous Deep Processing Method of Waste Water from FGD high as claimed in claim 1 and system, it is characterised in that the drop chi
Very little measuring instrument (19) one end is connected with observation window (18), and the other end is connected with computer (20), and the observation window (18) is for seeing
Survey the macro-effect of drop atomization；The drop size measurement instrument (19) is taken the photograph using laser-Doppler (LDV) system or at a high speed
Shadow machine, measures diameter and the distribution of drop, and drop size enters the gas liquid ratio of mixing chamber (5) by adjusting air compressor (8),
The size of mouth atomized drop is touched in regulation, is controlled below 50 μm；The number that computer (20) analysis and treatment measuring instrument are used
According to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611233561.1A CN106673101B (en) | 2016-12-28 | 2016-12-28 | Deep treatment method and system for high-salt-content desulfurization wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611233561.1A CN106673101B (en) | 2016-12-28 | 2016-12-28 | Deep treatment method and system for high-salt-content desulfurization wastewater |
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| CN106673101A true CN106673101A (en) | 2017-05-17 |
| CN106673101B CN106673101B (en) | 2020-06-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107445229A (en) * | 2017-08-05 | 2017-12-08 | 周维民 | A kind of feces of livestock and poultry penetrating fluid reclaims enrichment facility |
| CN109336203A (en) * | 2018-11-26 | 2019-02-15 | 广东威特宝土壤修复科研中心有限公司 | Waste water evaporation process system and the processing system that water is evaporated by change water quality |
| CN109557062A (en) * | 2018-12-10 | 2019-04-02 | 徐州工程学院 | A kind of desulfurization wastewater drop evaporation test device and test method |
| CN110420471A (en) * | 2019-08-18 | 2019-11-08 | 天津格林泰格科技有限公司 | A kind of energy saving vapo(u)rization system for liquid evaporation |
| CN110550682A (en) * | 2018-05-30 | 2019-12-10 | 中国科学院广州能源研究所 | Small-size waste water concentration system |
| CN111087034A (en) * | 2019-12-12 | 2020-05-01 | 西安交通大学 | Desulfurization waste water and salt recovery system and method of integrated absorption heat pump |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105460993A (en) * | 2016-01-13 | 2016-04-06 | 大连科林能源工程技术开发有限公司 | Dry environment-friendly treating and solid salt recycling system for high-concentration salt-containing waste water |
| CN106145228A (en) * | 2016-09-08 | 2016-11-23 | 国投百川环保科技（北京）有限公司 | The two-part vaporising device of desulfurization wastewater and processing method thereof |
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2016
- 2016-12-28 CN CN201611233561.1A patent/CN106673101B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105460993A (en) * | 2016-01-13 | 2016-04-06 | 大连科林能源工程技术开发有限公司 | Dry environment-friendly treating and solid salt recycling system for high-concentration salt-containing waste water |
| CN106145228A (en) * | 2016-09-08 | 2016-11-23 | 国投百川环保科技（北京）有限公司 | The two-part vaporising device of desulfurization wastewater and processing method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107445229A (en) * | 2017-08-05 | 2017-12-08 | 周维民 | A kind of feces of livestock and poultry penetrating fluid reclaims enrichment facility |
| CN110550682A (en) * | 2018-05-30 | 2019-12-10 | 中国科学院广州能源研究所 | Small-size waste water concentration system |
| CN110550682B (en) * | 2018-05-30 | 2022-04-12 | 中国科学院广州能源研究所 | Small-size waste water concentration system |
| CN109336203A (en) * | 2018-11-26 | 2019-02-15 | 广东威特宝土壤修复科研中心有限公司 | Waste water evaporation process system and the processing system that water is evaporated by change water quality |
| CN109557062A (en) * | 2018-12-10 | 2019-04-02 | 徐州工程学院 | A kind of desulfurization wastewater drop evaporation test device and test method |
| CN110420471A (en) * | 2019-08-18 | 2019-11-08 | 天津格林泰格科技有限公司 | A kind of energy saving vapo(u)rization system for liquid evaporation |
| CN111087034A (en) * | 2019-12-12 | 2020-05-01 | 西安交通大学 | Desulfurization waste water and salt recovery system and method of integrated absorption heat pump |
| CN111087034B (en) * | 2019-12-12 | 2022-02-22 | 西安交通大学 | Desulfurization waste water and salt recovery system and method of integrated absorption heat pump |
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| CN106673101B (en) | 2020-06-26 |
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Effective date of registration: 20220128 Address after: 213164 2220, block B, science and Education Hall, Changzhou science and Education City, No. 18, middle Changwu Road, Wujin District, Changzhou City, Jiangsu Province Patentee after: Jiangsu changnuo energy and Environmental Protection Technology Co.,Ltd. Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |
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