CN202465273U - Process system for preparing sulfuric acid from hydrogen sulfide through wet method - Google Patents
Process system for preparing sulfuric acid from hydrogen sulfide through wet method Download PDFInfo
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- CN202465273U CN202465273U CN2011205350022U CN201120535002U CN202465273U CN 202465273 U CN202465273 U CN 202465273U CN 2011205350022 U CN2011205350022 U CN 2011205350022U CN 201120535002 U CN201120535002 U CN 201120535002U CN 202465273 U CN202465273 U CN 202465273U
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- sulfuric acid
- hydrogen sulfide
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model provides a process system for preparing sulfuric acid from hydrogen sulfide through a wet method. The process system comprises four procedures which are connected in sequence, namely, hydrogen sulfide combustion, sulfur dioxide catalytic oxidation, sulfuric acid steam condensation and sulfuric acid temperature reduction and concoction; the hydrogen sulfide combustion is that the mixture of hydrogen sulfide acid gas and air combusts in an acid gas burning furnace, and during the combustion process, hydrogen sulfide is oxidated to be converted into sulfur dioxide; the sulfur dioxide catalytic oxidation is that the sulfur dioxide is catalyzed and oxidated to be converted into sulfur trioxide in a catalytic reactor; the sulfuric acid steam condensation is that the sulfur trioxide exchanges heat with a heat exchanger to be cooled and is then converted into concentrated sulphuric acid after further being condensed and cooled by a sulfuric acid condenser; and the sulfuric acid temperature reduction and concoction is that the concentrated sulphuric acid is further cooled and confected by a sulfuric acid water cooler so as to form a sulfuric acid finished product. A plurality of process facilities in the conventional technology for preparing sulfuric acid from hydrogen sulfide are improved, so that the whole process facility is simpler, the utilization efficiency of heat energy is higher, the conversion rate of hydrogen sulfide is higher, and the integral economic benefits are better.
Description
Technical field
The utility model relates to a kind of hydrogen sulfide preparation system, relates in particular to a kind of wet method hydrogen sulfide and prepares the vitriolic process system.
Background technology
Hydrogen sulfide (H
2S) be a kind of mineral compound.Under the normal circumstances a kind of colourless, inflammable sour gas, band stench when concentration is low, smell such as addled egg; There is not smell (because the hydrogen sulfide of high density can be benumbed olfactory nerve) when concentration is high on the contrary.The hydrogen sulfide nature is present among crude oil, Sweet natural gas, volcanic gas and the hot spring.Hydrogen sulfide results from natural gas conditioning, refining of petroleum, and makes production processes such as coal gas, process hides, pharmacy, papermaking, synthetic chemistry fiber.Hydrogen sulfide is colourless gas, and the pungency stench is arranged, and is volatile, is blue flame during burning.Hydrogen sulfide is one of atmospheric principal pollutant, not only is detrimental to health, also can severe corrosion equipment etc.
Hydrogen sulfide waste gas can not directly be thrown in the environment, in the existing Technology, generally adopts claus process to handle hydrogen sulfide and reclaim and obtains sulphur; This process method, processing condition more complicated, long flow path; Equipment is also many, and the exhaust pollutant residual quantity is high, can not satisfy environmental emission standard.
Application number is 200410047016.4 Chinese patent " a kind of hydrogen sulfide is done wet method combination system high-concentration sulfuric acid technology "; Disclose and a kind ofly prepared vitriolic technology through hydrogen sulfide; Mainly comprise following process step: 1. acid hydrogen sulfide gas is sent into mixed burning in the incinerator with the high temperature molten sulfur through the nozzle mechanical atomizing with purifying air; 600 ℃～1100 ℃ of temperature of combustion; Generation contains the high-temperature reacting gas of components such as sulfurous gas, water, after the recovery heat makes the temperature of reactant gases reduce to 410 ℃～430 ℃, directly gets into conversion procedure; 2. reactant gases transforms in doing wet combination convertor; Adopt wet method to transform in first three section of convertor; One time the reforming gas temperature is reduced to 255 ℃～270 ℃, get into to absorb operation and removes sulphur trioxide and water, reforming gas behind the hot heat exchange to 415 of internal-response ℃ entering convertor two sections; Adopt dry method to carry out twice transformation, the sulfur dioxide gas of remainder is changed into sulphur trioxide; 3. a reforming gas gets into the systems such as acid tower, nicotinic acid tower and first absorption tower that are condensed in the dried operation of inhaling, and water, the sulphur trioxide in the gas is condensed, absorbs acid, and the acid mist of removing wherein through mist eliminator is again got back to conversion procedure; 4. get into after twice transformation gas is cooled to 160 ℃ to do and inhale operation second absorption tower, after the sulphur trioxide in second absorption tower in the gas was absorbed, tail gas was removed acid mist wherein through mist eliminator, through chimney emptying.Adopt dried wet combined method to carry out hydrogen sulfide in this process method and prepared sulfuric acid, existed technology comparatively complicated, the problem that transformation efficiency is not high.In the prior art urgent hope to find a kind ofly can hydrogen sulfide efficiently be converted into sulfuric acid, and Processes and apparatus is all comparatively simple, the hydrogen sulfide of better economic benefit prepares the vitriolic process system.
The utility model content
The utility model technical problem to be solved provides a kind of wet method hydrogen sulfide and prepares the vitriolic process system; Improve through having a plurality of processing units that hydrogen sulfide prepares in the sulfur process technology now; Make integrated artistic equipment more simple; Utilization efficiency of heat energy is higher, and the hydrogen sulfide transformation efficiency is higher, and whole economic efficiency is better.
In order to achieve the above object, the utility model provides a kind of wet method hydrogen sulfide to prepare the vitriolic process system, and said system comprises the sulfureted hydrogen burning that connects in order, and sulfurous gas catalyzed oxidation, sulfuric acid vapor condensation, sulfuric acid are lowered the temperature and modulated four operations;
Said sulfureted hydrogen burning comprises that one is used for hydrogen sulfide sour gas and AIR MIXTURES are carried out incendiary acid gas roasting kiln; Also be connected with on the said acid gas roasting kiln one be used for the sulfureted hydrogen burning heat recuperation waste heat boiler, said acid gas roasting kiln is connected with said waste heat boiler one;
Said sulfurous gas catalyzed oxidation comprise one be used for that the sulfureted hydrogen burning process is produced the sulfurous gas catalyzed oxidation be the catalyticreactor of sulphur trioxide; Said catalyticreactor is horizontal multistage catalyticreactor, comprises three reaction beds at least, connects through interchanger between the said reaction bed;
Said sulfuric acid vapor condensation comprises that one is used for the interchanger with the sulphur trioxide heat exchange after oxidation cooling, and the condensation of sulfuric acid device that is used for sulphur trioxide further condensation cooling the becoming vitriol oil;
Cooling of said sulfuric acid and modulation comprise that one is used for the back that further lowers the temperature of the vitriol oil after the condensation cooling is become the sulfuric acid water cooler of sulfuric acid finished product after modified.
Further preferably, the outlet of said condensation of sulfuric acid device is connected with one and is used to assemble the sulfuric acid non-condensable gas and delivers to the acid mist eliminator that chimney discharges.
Further preferably; Said condensation of sulfuric acid device is a vertical structure; Comprise a housing, the top of said housing is provided with a non-condensable gas drain, and the bottom of said housing is provided with a liquid outlet; In said housing along the long axis direction of said housing, between both sides, stride the Glass tubing that is provided with some heat-eliminating mediums that are used to circulate; It is head end that said Glass tubing is positioned at an end that has on this heat-eliminating medium, and an end that is positioned at these heat-eliminating medium downstream is a tail end, thus the heat-eliminating medium runner that adjacent said Glass tubing is connected to end and forms at least one unidirectional water conservancy diversion between the upstream and downstream of this heat-eliminating medium.
Further preferably, be communicated with through " U " shape pipeline between the adjacent said Glass tubing.
Further preferably, be provided with static high-efficiency fiber mist eliminator in the said acid mist eliminator.
Further preferably, the boiler of said waste heat boiler and drum are formed in one.
The announcement of this patent system hydrogen sulfide prepare vitriolic technical process and concrete equipment; Its main process characteristic is that at first air being incorporated into the sulfuric acid that in the condensation of sulfuric acid device subsequent preparation is formed through blower fan carries out condensing heat-exchange; Air after heat exchange heats up mixes with the hydrogen sulfide sour gas through the traction of overfire air fan, gets into then and carries out combustion reactions in the acid gas roasting kiln, like this; Not only utilize normal temperature air that the condensation of sulfuric acid device has been carried out condensation; Also pass through temperature increase, thereby the feasible temperature that enters into the mixed gas of acid gas roasting kiln raises also, thereby more help the complete of combustion reactions normal temperature air.
This patent adopts acid gas roasting kiln and waste heat boiler one scheme of designing simultaneously, and porcelain bushing is adopted in boiler and drum integrated design simultaneously, and the weldprocedure of improvement tube sheet; Because the hydrogen sulfide combustion reactions is a thermopositive reaction, emit great amount of heat in the reaction process, through waste heat boiler heat output is reclaimed, can a large amount of middle super pressure-high temperature steam of output, produce or living needs thereby satisfy.
The catalyticreactor of this patent adopts horizontal multistage catalyticreactor, does not use high framework, makes things convenient for the manufacture, installation, maintenance operation, and between reaction bed, connects through interchanger, thereby with a large amount of heat recuperation that produce in the reaction process.
The condensation of sulfuric acid device that this patent adopts adopts vertical structure; And employing Glass tubing lateral arrangement; Acidity is made shell side leave with rage, has overcome vertical layout of Glass tubing in the general device and the long Glass tubing that produces fracture and the high problem of production cost easily, helps the device fabrication making.
The acid mist unit has overcome and adopts burning silicone oil to be easy to generate that the nucleus of condensation, control difficulty are big, the problem of weak effect in the existing installation in this patent; This patent does not adopt the operation of burning silicone oil; And have additional static high-efficiency fiber mist eliminator, thereby perfectly solved this problem.
In general, this patent process system hydrogen sulfide transformation efficiency is high, and the concentration of hydrogen sulfide is lower than 10ppmv in the non-condensable gas of discharging; Significantly be superior to existing environmental protection standard, technical process is rationally distributed, simple and remarkable in economical benefits; The complex energy utilization ratio is high, and the integral device cost is low, energy-conserving and environment-protective.
Description of drawings
Through the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the utility model will become apparent and understand easily.
Fig. 1 is the rough schematic of the utility model patent process system;
Fig. 2 is the one-piece construction synoptic diagram of the utility model patent process system;
Fig. 3 is the structural representation of the condensation of sulfuric acid device of the utility model patent;
The reference numeral explanation:
1- housing 11- floss hole 12- air inlet 13- liquid outlet 2- condensation of sulfuric acid device 21- primary air fan 22- overfire air fan 3- fiber filter plate 4- acid gas combustion furnace 5- catalytic reactor 51- cooling medium inlet 52- cooling medium outlet the 3rd group of glass tube unit of 63-, second group of glass tube unit of 62-, the 53- first bobbin carriage 54- second bobbin carriage 55- the 3rd bobbin carriage 56- first group of glass tube unit of the 4th bobbin carriage 6- heat exchanger 61- 7- sulfuric acid fluid reservoir 71- acid mist eliminator 72- chimney 73- sulfuric acid pump 74- sulfuric acid water cooler
Embodiment
Below in conjunction with accompanying drawing the utility model is done further explain.
Like Fig. 1, shown in 2, a kind of wet method hydrogen sulfide prepares the vitriolic process system, and system comprises the sulfureted hydrogen burning that connects in order, and sulfurous gas catalyzed oxidation, sulfuric acid vapor condensation, sulfuric acid are lowered the temperature and modulated four operations; Sulfureted hydrogen burning is meant that hydrogen sulfide sour gas and AIR MIXTURES burn in acid gas roasting kiln 4, hydrogen sulfide oxidation conversion in combustion processes is a sulfurous gas; Also be connected with on the acid gas roasting kiln 4 one be used for the sulfureted hydrogen burning heat recuperation waste heat boiler, acid gas roasting kiln 4 is connected as a whole with the waste heat boiler one, the boiler and the drum of waste heat boiler are formed in one.The sulfurous gas catalyzed oxidation is meant that the sulfurous gas catalyzed oxidation in catalyticreactor 5 that produces in the sulfureted hydrogen burning process is a sulphur trioxide; Catalyticreactor 5 is horizontal multistage catalyticreactor, comprises three reaction beds at least, connects through interchanger between the reaction bed, for example can be three beds, two heat exchanger structures, promptly is connected in series through two interchanger between three reaction beds.The sulfuric acid vapor condensation is meant that 2 further condensations coolings became the vitriol oil through the condensation of sulfuric acid device again after the sulphur trioxide after the oxidation was lowered the temperature through interchanger 6 heat exchange; Sulfuric acid cooling and modulation are meant that the vitriol oil after the condensation cooling becomes the sulfuric acid finished product after modified after the 73 further coolings of persulfuric acid water cooler.
In this patent; Sulphur trioxide does not also reach the sulphuric acid dew point temperature after lowering the temperature through interchanger 6 heat exchange; Further heat exchange condensation in condensation of sulfuric acid device 2; Condensed sulfuric acid enters into sulfuric acid container for storing liquid 7 from condensation of sulfuric acid device 2 bottoms, and then pumps in the sulfuric acid water cooler 74 further cooling through persulfuric acid pump 73 and become the sulfuric acid finished product after modified.Air gets into condensation of sulfuric acid device 2 after through the traction of primary air fan 21 to carry out heat exchange with sulfuric acid and heats up afterwards through mixing with the hydrogen sulfide sour gas after the traction of overfire air fan 22.The sulfuric acid non-condensable gas of condensation of sulfuric acid device 2 tower top outlets is delivered to chimney 72 after through acid mist eliminator 71 coalescences and is discharged.Be provided with static high-efficiency fiber mist eliminator in the acid mist eliminator 71.
As shown in Figure 3; Condensation of sulfuric acid device 2 is a vertical structure, comprises a housing 1, and the top of housing 1 is provided with a non-condensable gas drain 11; The bottom of housing 1 is provided with the inlet mouth 12 of an input sulfuric acid vapor, below inlet mouth 12, also be provided with one be used to discharge the condensed vitriol oil liquid outlet 13.The bottom of housing 1 becomes semicircular structure, and liquid outlet 13 is positioned at the below of circular configuration, and the diminishing structure of direction such as del or inverted trapezoidal structure can be discharged along liquid for other in housing 1 bottom certainly.In addition, the upper reaches that the top of housing 1 is positioned at drain 11 are provided with a fiber filter plate 3 as filter mechanism, the liquid small-particle of the tail gas that is used for producing behind the filter freezing.In housing 1 along the long axis direction of housing 1, between both sides, stride the Glass tubing that is provided with the some groups of heat-eliminating mediums that are used to circulate; It is head end that Glass tubing is positioned at an end that has on this heat-eliminating medium; An end that is positioned at these heat-eliminating medium downstream is a tail end, thus the heat-eliminating medium runner that adjacent said Glass tubing is connected to end and forms at least one unidirectional water conservancy diversion between the upstream and downstream of this heat-eliminating medium.Be communicated with through " U " shape pipeline between the adjacent Glass tubing.Concrete; On a bobbin carriage of the top, be provided with cooling medium inlet 51, be provided with heat-eliminating medium outlet 52 on the bobbin carriage below being positioned at, what misplace up and down in the left and right sides of housing 1 is provided with some bobbin carriages; The stem of first group of Glass tubing unit 61 is positioned at first bobbin carriage 53 of top, left side from top to bottom; Afterbody is positioned at second bobbin carriage 54 of top, right side, and the stem of second group of Glass tubing unit 62 is positioned at second bobbin carriage 54 from top to bottom, and afterbody is positioned at the 3rd bobbin carriage 55 of first bobbin carriage, 53 belows; The stem of top-down the 3rd group of Glass tubing unit 63 is positioned at the 3rd bobbin carriage 55; Tail end is positioned at the 4th bobbin carriage 56 of second bobbin carriage, 54 belows, and the like, thereby the cooling medium pass of formation hyperchannel, unidirectional water conservancy diversion.
It should be noted that; Above content is the further explain that combines concrete embodiment that the utility model is done; The embodiment that can not assert the utility model only limits to this; Under the above-mentioned guidance of the utility model, those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improve or distortion drops in the protection domain of the utility model.
Claims (6)
1. a wet method hydrogen sulfide prepares the vitriolic process system, it is characterized in that: said system comprises the sulfureted hydrogen burning that connects in order, and sulfurous gas catalyzed oxidation, sulfuric acid vapor condensation, sulfuric acid are lowered the temperature and modulated four operations;
Said sulfureted hydrogen burning comprises that one is used for hydrogen sulfide sour gas and AIR MIXTURES are carried out incendiary acid gas roasting kiln; Also be connected with on the said acid gas roasting kiln one be used for the sulfureted hydrogen burning heat recuperation waste heat boiler, said acid gas roasting kiln is connected with said waste heat boiler one;
Said sulfurous gas catalyzed oxidation comprise one be used for that the sulfureted hydrogen burning process is produced the sulfurous gas catalyzed oxidation be the catalyticreactor of sulphur trioxide; Said catalyticreactor is horizontal multistage catalyticreactor, comprises three reaction beds at least, connects through interchanger between the said reaction bed;
Said sulfuric acid vapor condensation comprises that one is used for the interchanger with the sulphur trioxide heat exchange after oxidation cooling, and the condensation of sulfuric acid device that is used for sulphur trioxide further condensation cooling the becoming vitriol oil;
Cooling of said sulfuric acid and modulation comprise that one is used for the back that further lowers the temperature of the vitriol oil after the condensation cooling is become the sulfuric acid water cooler of sulfuric acid finished product after modified.
2. wet method hydrogen sulfide according to claim 1 prepares the vitriolic process system, it is characterized in that: the outlet of said condensation of sulfuric acid device is connected with one and is used to assemble the sulfuric acid non-condensable gas and delivers to the acid mist eliminator that chimney discharges.
3. wet method hydrogen sulfide according to claim 1 prepares the vitriolic process system; It is characterized in that: said condensation of sulfuric acid device is a vertical structure; Comprise a housing; The top of said housing is provided with a non-condensable gas drain; The bottom of said housing is provided with a liquid outlet, in said housing along the long axis direction of said housing, between both sides, stride the Glass tubing that is provided with some heat-eliminating mediums that are used to circulate, it is head end that said Glass tubing is positioned at an end that has on this heat-eliminating medium; An end that is positioned at these heat-eliminating medium downstream is a tail end, thus the heat-eliminating medium runner that adjacent said Glass tubing is connected to end and forms at least one unidirectional water conservancy diversion between the upstream and downstream of this heat-eliminating medium.
4. wet method hydrogen sulfide according to claim 3 prepares the vitriolic process system, it is characterized in that: be communicated with through " U " shape pipeline between the adjacent said Glass tubing.
5. wet method hydrogen sulfide according to claim 2 prepares the vitriolic process system, it is characterized in that: be provided with static high-efficiency fiber mist eliminator in the said acid mist eliminator.
6. wet method hydrogen sulfide according to claim 1 prepares the vitriolic process system, it is characterized in that: the boiler and the drum of said waste heat boiler are formed in one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205350022U CN202465273U (en) | 2011-12-20 | 2011-12-20 | Process system for preparing sulfuric acid from hydrogen sulfide through wet method |
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| CN2011205350022U CN202465273U (en) | 2011-12-20 | 2011-12-20 | Process system for preparing sulfuric acid from hydrogen sulfide through wet method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264994A (en) * | 2013-06-04 | 2013-08-28 | 刘立文 | Method for producing sulphuric acid by adopting wet process |
| CN109573959A (en) * | 2019-01-04 | 2019-04-05 | 科洋环境工程（上海）有限公司 | The multi-stage oxidizing sulphuric acid plant and acid-making process of hydrogen sulfide sour gas |
| CN109650346A (en) * | 2019-01-25 | 2019-04-19 | 科洋环境工程（上海）有限公司 | A kind of wet process sulfur process system and method for the secondary pressurized production concentrated sulfuric acid |
| CN110127629A (en) * | 2019-04-25 | 2019-08-16 | 南京聚拓化工科技有限公司 | A kind of wet process sulfide prepares the device and technique of sulfuric acid |
| WO2020140799A1 (en) * | 2019-01-04 | 2020-07-09 | 科洋环境工程（上海）有限公司 | Acid production device and acid production process using multi-stage oxidation of hydrogen sulfide acidic gas |
-
2011
- 2011-12-20 CN CN2011205350022U patent/CN202465273U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103264994A (en) * | 2013-06-04 | 2013-08-28 | 刘立文 | Method for producing sulphuric acid by adopting wet process |
| CN109573959A (en) * | 2019-01-04 | 2019-04-05 | 科洋环境工程（上海）有限公司 | The multi-stage oxidizing sulphuric acid plant and acid-making process of hydrogen sulfide sour gas |
| WO2020140799A1 (en) * | 2019-01-04 | 2020-07-09 | 科洋环境工程（上海）有限公司 | Acid production device and acid production process using multi-stage oxidation of hydrogen sulfide acidic gas |
| CN109650346A (en) * | 2019-01-25 | 2019-04-19 | 科洋环境工程（上海）有限公司 | A kind of wet process sulfur process system and method for the secondary pressurized production concentrated sulfuric acid |
| CN110127629A (en) * | 2019-04-25 | 2019-08-16 | 南京聚拓化工科技有限公司 | A kind of wet process sulfide prepares the device and technique of sulfuric acid |
| CN110127629B (en) * | 2019-04-25 | 2020-11-17 | 南京聚拓化工科技有限公司 | Device and process for preparing sulfuric acid from sulfide by wet process |
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| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI KEYONTECHS CO., LTD. Free format text: FORMER NAME: SHANGHAI KEYONTECHS DEVELOPMENT CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 201502 room 3, hall 38, Lane 168, Lane 19, welfare Road, Xingcheng Town, Shanghai, Jinshan District Patentee after: SHANGHAI KEYONTECHS CO., LTD. Address before: 201502 room 3, hall 38, Lane 168, Lane 19, welfare Road, Xingcheng Town, Shanghai, Jinshan District Patentee before: Shanghai Keyontechs Development Co., Ltd. |
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Address after: Jinshan District Fengjing town 201501 Shanghai Xinghao Road No. 7 Patentee after: SHANGHAI KEYONTECHS CO., LTD. Address before: 201502 room 3, hall 38, Lane 168, Lane 19, welfare Road, Xingcheng Town, Shanghai, Jinshan District Patentee before: SHANGHAI KEYONTECHS CO., LTD. |
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