CN102172461B - Automatic high-efficiency energy-saving purification system for industrial volatilizable organic pollutants - Google Patents
Automatic high-efficiency energy-saving purification system for industrial volatilizable organic pollutants Download PDFInfo
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- CN102172461B CN102172461B CN 201110073011 CN201110073011A CN102172461B CN 102172461 B CN102172461 B CN 102172461B CN 201110073011 CN201110073011 CN 201110073011 CN 201110073011 A CN201110073011 A CN 201110073011A CN 102172461 B CN102172461 B CN 102172461B
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Abstract
The invention relates to an automatic high-efficiency energy-saving purification system for industrial volatilizable organic pollutants, which is characterized in that: (1) both opposite side walls of an active carbon bed body of an adsorption bed are set into side walls with hollow structures, an active carbon clapboard is set into an active carbon clapboard with a hollow structure, the active carbon clapboard with the hollow structure is communicated with the side walls with the hollow structures, and the two side walls with the hollow structures are respectively provided with a hot air inlet and a hot air outlet; and (2) a catalytic combustion bed is connected with a plate-type heat exchanger, and the plate-type heat exchanger is connected with the hot air inlets on the side walls withthe hollow structures of the adsorption bed through an adsorption bed heating fan. The automatic high-efficiency energy-saving purification system for the for industrial volatilizable organic pollutants has a simple and reasonable structure, can effectively reduce energy consumption, improve the purifying rate, prolong the service life of a catalyst, shorten the desorption process time, improve the purifying efficiency and reduce the operating cost, and is safe and reliable.
Description
Technical field
The invention belongs to organic pollution cleaning system field, especially a kind of automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants.
Background technology
The cleaning system that application adsorption system and desorption catalyzing combustion system constitute jointly in the prior art realizes the improvement to the large-wind-volume low-concentration industrial volatile organic pollutants, its primary structure comprises desorption electric heater, catalytic combustion bed, mixed flow heat exchanger, desorption circulating fan and the electric cabinet in filter, spark arrester, adsorbent bed, absorption main air blower and the desorption catalyzing combustion system in the adsorption system, and electric cabinet is carried out corresponding actions by each equipment and electrically operated valve in circuit control adsorption system and the desorption catalyzing combustion system.Filter in the adsorption system, spark arrester, adsorbent bed and absorption main air blower connect successively by pipeline, realization is to the absorption of large-wind-volume low-concentration industrial volatile organic pollutants, after adsorbent in the adsorbent bed reaches capacity, pass through valve event, adsorbent bed is switched to the desorption catalyzing combustion system, the desorption circulating fan is introduced mixed flow heat exchanger and desorption electric heater with air successively by pipeline, enter adsorbent bed through the air after heating up and realize desorption, waste gas behind the desorption delivers into the catalytic combustion bed and carries out catalytic combustion generating clean gas up to standard, a part of cleaning gas up to standard enters atmosphere, and another part cleans gas up to standard and enters the mixed flow heat exchanger heat energy is provided.Although this existing system can be realized the processing of large-wind-volume low-concentration industrial volatile organic pollutants, but there are the following problems: 1. because will be to adsorbent in entering adsorbent bed by the air after the intensification of desorption electric heater, adsorbate and adsorbent bed metal structure heat simultaneously, the adsorbent bed metal structure just consumes partial heat energy like this, thereby prolonged desorption time, reduced desorption efficient, especially northerly winter, heat-energy losses is larger, desorption time is longer, and the waste heat that catalytic combustion produces is not fully utilized also can increase the weight of thermal pollution to atmospheric environment; 2. when the heat energy of the cleaning high-temperature gas up to standard that utilizes the catalytic combustion bed to discharge, owing to adopting the mixed flow heat exchange mode, the existence of high-temperature catalytic tail gas has reduced the partial pressure of oxygen of mist, the active oxygen that participates in catalytic reaction is reduced, catalyst activity reduces, thereby have influence on the continuous stability of catalytic oxidation and reacting completely property, purifying rate reduction, electrical heating energy consumption are increased; 3. the purifying rate of catalytic combustion bed is lower, catalyst is short service life, trace it to its cause for: industrial volatile organic pollutants is to enter catalytic combustion bed of the prior art from the below, discharge from the top, the catalytic combustion that lower floor occurs produces heat effect to the catalytic bed on upper strata, thereby whole catalytic bed upper area easily surpasses the operating temperature of its permission because of the heat energy savings, and catalyst is lost activity, cause purifying rate to reduce, catalyst shortening in service life; Industrial volatile organic pollutants catalyticing combustion process free convection direction is bottom-up operation in addition, and during through the catalytic combustion bed, waste gas begins to accelerate to rise, and causes reduce the time of contact of waste gas and catalytic combustion bed, causes purifying rate to reduce.The three aspects: reason causes that whole cleaning system energy consumption of the prior art is high, purifying rate is low in sum, catalyst shortens service life, the desorption flow time is long, purification efficiency is lower, and operating cost is higher.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of and can effectively reduce energy consumption, improve purifying rate, extending catalyst service life, shorten the desorption flow time, improve purification efficiency, reduce the automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants of operating cost.
The present invention solves its technical problem and is achieved through the following technical solutions:
A kind of automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants, comprise filter, the first spark arrester, adsorbent bed, absorption main air blower, catalytic combustion bed, mixed flow heat exchanger, desorption electric heater, desorption circulating fan and electric cabinet, filter, spark arrester, adsorbent bed and absorption main air blower connect successively by pipeline, catalytic combustion bed the first air outlet connects mixed flow heat exchanger the first air inlet by pipeline, mixed flow heat exchanger air outlet connects the desorption circulating fan by desorption electric heater and adsorbent bed, and its innovative point is:
(1), adsorbent bed comprises the air intake expansion mouth, active-carbon bed body and air-out choke, the two sides that active-carbon bed body is relative connects respectively air intake expansion mouth and air-out choke, be fixed with air distribution plate at the air intake expansion mouth, multilayer active carbon dividing plate is set in the active-carbon bed body, wherein active-carbon bed body two lateral walls all is set to have the sidewall of hollow structure, the active carbon dividing plate is set to have the active carbon dividing plate of hollow structure, active carbon dividing plate with hollow structure is communicated with the sidewall with hollow structure, has on the two side of hollow structure to be respectively arranged with hot blast import and hot-blast outlet;
(2), catalytic combustion bed the second air outlet connects the thermal source wind inlet of a plate type heat exchanger by pipeline, the first thermal source wind outlet of this plate type heat exchanger connects the sidewall hot blast import that adsorbent bed has hollow structure by an adsorbent bed heating blower;
(3), this plate type heat exchanger is provided with the first gas feed to be heated, the first gas vent to be heated, the second gas feed to be heated and the second gas vent to be heated, wherein the first gas vent to be heated connects mixed flow heat exchanger the second air inlet by pipeline, the second gas feed to be heated connects the outlet of desorption circulating fan, and the second gas vent to be heated connects catalytic combustion bed air inlet;
(4), electric cabinet is by pre-set programs and circuit difference controlled filter device, the first spark arrester, adsorbent bed, absorption main air blower, catalytic combustion bed, adsorbent bed heating blower, desorption electric heater, desorption circulating fan and all valves.
And, described catalytic combustion bed comprises catalytic bed body, air inlet, air outlet, catalysis electric heater, air distribution plate and catalytic bed, its catalytic bed body upper end is shaped with air inlet, catalytic bed body lower end is shaped with air outlet, be disposed with from top to bottom catalysis electric heater, air distribution plate and catalytic bed in the catalytic bed body, the external wall of this catalytic bed is fixedly mounted with the pyroceram fibre heat-insulation layer.
And described catalytic bed comprises catalyst carrier and catalyst, and catalyst carrier is honeycomb ceramic body, and catalyst is alundum (Al2O3) and Bo, Palladium.
And, described at plate type heat exchanger the second gas vent to be heated and catalytic combustion bed air inlet between install one second spark arrester additional.
Advantage of the present invention and beneficial effect are:
1, the adsorbent bed of this cleaning system comprises the air intake expansion mouth, active-carbon bed body and air-out choke, the two sides that active-carbon bed body is relative connects respectively air intake expansion mouth and air-out choke, be fixed with air distribution plate at the air intake expansion mouth, multilayer active carbon dividing plate is set in the active-carbon bed body, wherein active-carbon bed body two lateral walls all is set to have the sidewall of hollow structure, the active carbon dividing plate is set to have the active carbon dividing plate of hollow structure, active carbon dividing plate with hollow structure is communicated with the sidewall with hollow structure, have on the two side of hollow structure and be respectively arranged with hot blast import and hot-blast outlet, catalytic combustion bed the second air outlet connects the hot blast import of a plate type heat exchanger by pipeline, the first hot-blast outlet of this plate type heat exchanger connects the hot blast import that adsorbent bed has the hollow structure sidewall by an adsorbent bed heating blower; The hot blast import of this kind structure connects the outlet of catalytic bed tail gas, desorption process utilizes the hardware of catalysis tail gas heating adsorbent bed inside and passes through interior adsorbent and the adsorbate of conduction convection type indirect adsorbent bed, thereby significantly shortened desorption time, reduced power consumption, take full advantage of the heat energy that catalyticing combustion process produces, environmental protection, and greatly reduce equipment operating cost, improved exhaust-gas treatment efficient, and can effectively solve at the northern area winter temperature low, the desorption extending heating time, power consumption increases, even the technical barrier that the desorption flow process can not normally be moved.
2, this cleaning system adopts plate type heat exchanger, it is provided with the first gas feed to be heated, the first gas vent to be heated, the second gas feed to be heated and the second gas vent to be heated, wherein the first gas vent to be heated connects mixed flow heat exchanger the second air inlet by pipeline, the second gas feed to be heated connects the outlet of desorption circulating fan, and the second gas vent to be heated connects catalytic combustion bed air inlet; This structure can effectively be carried out heat exchange to Cryogenic air, make Cryogenic air reach desorption temperature, and improved oxygen content in the VOCs gas that enters catalytic bed, and improved catalytic combustion purifying rate and desorption efficient, reduced the thermal pollution to environment when taking full advantage of catalytic combustion thermal energy.
3, the catalytic combustion bed of this cleaning system comprises the catalytic bed body, air inlet, air outlet, the catalysis electric heater, air distribution plate and catalytic bed, its catalytic bed body upper end is shaped with air inlet, catalytic bed body lower end is shaped with air outlet, be disposed with from top to bottom the catalysis electric heater in the catalytic bed body, air distribution plate and catalytic bed, the external wall of this catalytic bed is fixedly mounted with the pyroceram fibre heat-insulation layer, this structure Effective Raise the time of contact of waste gas and catalytic bed, avoided the overheated of catalytic bed top, make temperature equalization between each catalytic bed, improved the catalytic purification rate, and the pyroceram fibre of the external wall of catalytic bed can effectively reduce heat energy loss, raising catalytic combustion efficient and self-sustaining burning stability.
4, this cleaning system installs one second spark arrester additional between the second gas vent to be heated of plate type heat exchanger and catalytic combustion bed air inlet, has increased Security of the system and reliability, prevents the generation of contingency.
5, system architecture advantages of simple of the present invention, can effectively reduce energy consumption, improve purifying rate, extending catalyst service life, shorten the desorption flow time, improve purification efficiency, reducing operating cost, is a kind of safe and reliable automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants.
Description of drawings
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the structural representation of adsorbent bed of the present invention;
Fig. 3 is the right view (omitting air-out choke and Alveolate activated carbon capable) of Fig. 2;
Fig. 4 is the top view of Fig. 2;
Fig. 5 is the structural representation of catalytic combustion bed of the present invention;
Fig. 6 is the top view of Fig. 5.
The specific embodiment
The invention will be further described below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants, comprise filter, the first spark arrester, adsorbent bed, absorption main air blower, catalytic combustion bed, mixed flow heat exchanger, desorption electric heater, desorption circulating fan and electric cabinet, filter, spark arrester, adsorbent bed and absorption main air blower connect successively by pipeline, catalytic combustion bed the first air outlet connects mixed flow heat exchanger the first air inlet by pipeline, mixed flow heat exchanger air outlet connects the desorption circulating fan by desorption electric heater and adsorbent bed, and its innovative point is:
(1), adsorbent bed comprises air intake expansion mouth 12, active-carbon bed body 5 and air-out choke 6, the small-caliber end of air intake expansion mouth connects blast pipe 1, this blast pipe can connect respectively the first spark arrester and desorption electric heater by threeway and valve, the small-caliber end of air-out choke connects discharge pipe 7, this discharge pipe can connect absorption main air blower and desorption circulating fan, air-out choke bottom offers manhole 8, this manhole is equipped with the door that reloads, active-carbon bed body top offers explosion-proof relief mouth 3, the two sides that active-carbon bed body is relative connects respectively air intake expansion mouth and air-out choke, be fixed with air distribution plate 11 at the air intake expansion mouth, this air distribution plate can be arranged according to the actual condition at scene, it mainly is evenly to guide the waste gas that contains industrial volatile organic pollutants on the active carbon dividing plate active carbon, multilayer active carbon dividing plate is set in the active-carbon bed body, place Alveolate activated carbon capable 10 on this active carbon dividing plate, the uniform thermometric thermal resistance connector 14 that is provided with on the active-carbon bed body sidewall, be used for connection thermal resistor, thereby each temperature data of very first time monitoring adsorbent bed, it is that the steel pipe of rectangle is as support that four jiaos of active-carbon bed bodies adopt the cross section, the moulding of convenient active-carbon bed body, for the connection of follow-up hollow structure is laid a solid foundation, active-carbon bed body two lateral walls all is set to have the sidewall 13 of hollow structure, the active carbon dividing plate is set to have the active carbon dividing plate 9 of hollow structure, active carbon dividing plate with hollow structure is communicated with the sidewall with hollow structure, have on the two side of hollow structure and be respectively arranged with hot blast import 2 and hot-blast outlet 4, the active carbon dividing plate with hollow structure after the connection and the sidewall with hollow structure can reach hot blast and enter after the active carbon dividing plate with hollow structure and sidewall with hollow structure flow from the hot blast import and discharge this hot blast import from hot-blast outlet, hot-blast outlet, the sidewall structures that has the active carbon dividing plate of hollow structure and have a hollow structure is mainly used in introducing catalytic combustion tail gas heating adsorbent bed metal structure altogether.If need to this adsorbent equipment fast cooling, to improve service efficiency, can also directly introduce air by threeway and blower fan from the hot blast import and cool off, thereby enter again adsorption process from desorption process more quickly in use;
(2), catalytic combustion bed the second air outlet connects the thermal source wind inlet of a plate type heat exchanger by pipeline, the first thermal source wind outlet of this plate type heat exchanger connects the sidewall hot blast import that adsorbent bed has hollow structure by an adsorbent bed heating blower, plate type heat exchanger is provided with the second hot-blast outlet, is used for directly discharging through the gas up to standard of heat exchange;
(3), this plate type heat exchanger is provided with the first gas feed to be heated, the first gas vent to be heated, the second gas feed to be heated and the second gas vent to be heated, wherein the first gas vent to be heated connects mixed flow heat exchanger the second air inlet by pipeline, the second gas feed to be heated connects the outlet of desorption circulating fan, the second gas vent to be heated connects catalytic combustion bed air inlet, installs one second spark arrester additional between the second gas vent to be heated of plate type heat exchanger and catalytic combustion bed air inlet; Described catalytic bed body 21, air inlet 15, air outlet 20, electric heater 16, air distribution plate 17 and catalytic bed 18, the external wall of catalytic bed is fixed with heat-insulation layer 19, this heat-insulation layer is pyroceram fibre, air outlet is set to 3, catalytic bed comprises catalyst carrier and catalyst, catalyst carrier is honeycomb ceramic carrier, catalyst is alundum (Al2O3) and platinum Palladium, alundum (Al2O3) is one year, platinum Palladium is two years, its catalytic bed body upper end is shaped with air inlet, catalytic bed body lower end is shaped with air outlet, be disposed with from top to bottom electric heater in the catalytic bed body, air distribution plate and catalytic bed, catalytic combustion bed arrange the 3rd air outlet and are used for direct emission compliance gas.
(4), electric cabinet is by pre-set programs and circuit difference controlled filter device, the first spark arrester, adsorbent bed, the absorption main air blower, the catalytic combustion bed, the adsorbent bed heating blower, the desorption electric heater, desorption circulating fan and the second spark arrester, differential pressure transmitter is set in the exhaust gas source collecting main road of the industrial volatile organic pollutants of native system before the adsorption system filter is used in the monitoring gas gathering manifold pressure differential with atmosphere, differential pressure signal is transferred in the electric cabinet, when the air pressure in the gas gathering manifold is higher than atmospheric pressure and be higher than setting value, control system will be adjusted absorption main air blower power output automatically, prevent that the ventilation system air draft is not smooth in the factory building, when gas pressure is lower than atmospheric pressure in the gas gathering manifold, control system will reduce absorption main air blower power output automatically, design can effectively adapt to the operating mode that exhaust emission system constantly changes like this, and effective saves energy.
The present invention in use, the exhaust gas source of industrial volatile organic pollutants is passed through filter successively by pipeline, the first spark arrester arrives adsorbent bed, gas after the waste gas of industrial volatile organic pollutants is processed through adsorbent bed can reach discharge standard and directly discharge, after the Alveolate activated carbon capable on the adsorbent bed reaches capacity, electric cabinet is controlled corresponding adsorption plant switching by pre-set programs and circuit and is entered the desorption flow process, start the desorption catalyzing combustion system, opening desorption circulating fan fresh air enters from the pipeline fresh inlet and enters adsorbent bed by mixed flow heat exchanger and desorption electric heater and carry out desorption, gas permeable plate formula heat exchanger behind the desorption and the second spark arrester enter the catalytic combustion bed and carry out the catalytic combustion purification, out tail gas has reached discharge standard from the catalytic combustion bed, for realizing UTILIZATION OF VESIDUAL HEAT IN, energy-saving and cost-reducing, provide thermal source with this high-temperature tail gas continuation introducing plate type heat exchanger and mixed flow heat exchanger, at this moment the fresh air that enters from fresh inlet at first can carry out heat exchange by plate type heat exchanger, enter adsorbent bed by mixed flow heat exchanger auxiliary heating again, reached the temperature that desorption requires owing to flowing through the air of mixed flow heat exchanger, so can close the desorption electric heater, that is to say when just beginning to start the desorption catalyzing combustion system, need to open the desorption electric heater, after catalyticing combustion process starts successfully and stablizes, namely can close the desorption electric heater, save electric energy, temperature was still about 100 ℃ after the tail gas of catalytic combustion bed discharge passed through plate type heat exchanger in addition, directly it is sent into the import of adsorbent bed hot blast by the adsorbent bed heating blower, this hot blast flows in active carbon dividing plate with hollow structure and sidewall with hollow structure, discharge from hot-blast outlet, by the metal structure in the direct heating adsorption bed, adsorbent bed desorption programming rate is accelerated, realize saving energy and reduce the cost by taking full advantage of the catalytic combustion waste heat, effect is particularly remarkable when the northern area winter operation.
Claims (4)
1. automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants, comprise filter, the first spark arrester, adsorbent bed, absorption main air blower, catalytic combustion bed, mixed flow heat exchanger, desorption electric heater, desorption circulating fan and electric cabinet, filter, spark arrester, adsorbent bed and absorption main air blower connect successively by pipeline, catalytic combustion bed the first air outlet connects mixed flow heat exchanger the first air inlet by pipeline, mixed flow heat exchanger air outlet connects the desorption circulating fan by desorption electric heater and adsorbent bed, it is characterized in that:
(1), adsorbent bed comprises the air intake expansion mouth, active-carbon bed body and air-out choke, the two sides that active-carbon bed body is relative connects respectively air intake expansion mouth and air-out choke, be fixed with air distribution plate at the air intake expansion mouth, multilayer active carbon dividing plate is set in the active-carbon bed body, wherein active-carbon bed body two lateral walls all is set to have the sidewall of hollow structure, the active carbon dividing plate is set to have the active carbon dividing plate of hollow structure, active carbon dividing plate with hollow structure is communicated with the sidewall with hollow structure, has on the two side of hollow structure to be respectively arranged with hot blast import and hot-blast outlet;
(2), catalytic combustion bed the second air outlet connects the thermal source wind inlet of a plate type heat exchanger by pipeline, the first thermal source wind outlet of this plate type heat exchanger connects the sidewall hot blast import that adsorbent bed has hollow structure by an adsorbent bed heating blower;
(3), this plate type heat exchanger is provided with the first gas feed to be heated, the first gas vent to be heated, the second gas feed to be heated and the second gas vent to be heated, wherein the first gas vent to be heated connects mixed flow heat exchanger the second air inlet by pipeline, the second gas feed to be heated connects the outlet of desorption circulating fan, and the second gas vent to be heated connects catalytic combustion bed air inlet;
(4), electric cabinet is distinguished controlled filter device, the first spark arrester, adsorbent bed, absorption main air blower, catalytic combustion bed, adsorbent bed heating blower, desorption electric heater, desorption circulating fan by pre-set programs and circuit.
2. automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants according to claim 1, it is characterized in that: described catalytic combustion bed comprises catalytic bed body, air inlet, air outlet, catalysis electric heater, air distribution plate and catalytic bed, its catalytic bed body upper end is shaped with air inlet, catalytic bed body lower end is shaped with air outlet, be disposed with from top to bottom catalysis electric heater, air distribution plate and catalytic bed in the catalytic bed body, the external wall of this catalytic bed is fixedly mounted with the pyroceram fibre heat-insulation layer.
3. automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants according to claim 2, it is characterized in that: described catalytic bed comprises catalyst carrier and catalyst, catalyst carrier is honeycomb ceramic body, and catalyst is alundum (Al2O3) and Bo, Palladium.
4. automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants according to claim 1 is characterized in that: described at plate type heat exchanger the second gas vent to be heated and catalytic combustion bed air inlet between install one second spark arrester additional.
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| CN103480226B (en) * | 2013-09-27 | 2015-05-27 | 天津赛智科技发展有限公司 | Industrial volatile organic pollutant purifying system dedicated to painting workshops |
| EP3204153B1 (en) * | 2014-10-09 | 2019-04-03 | Basf Se | Heat exchange process for adsorber regeneration |
| CN104474891A (en) * | 2014-12-04 | 2015-04-01 | 北京科太亚洲生态科技有限公司 | Organic waste gas treatment system |
| CN105771541A (en) * | 2016-04-07 | 2016-07-20 | 重庆纽贝环保科技有限公司 | Spraying waste gas purification system and purification method thereof |
| CN105709562A (en) * | 2016-04-07 | 2016-06-29 | 重庆纽贝环保科技有限公司 | Continuous purification treatment system for paint spraying waste gas and purification method adopting continuous purification treatment system |
| CN108487972A (en) * | 2018-03-30 | 2018-09-04 | 安徽合众智信科技咨询有限公司 | A kind of Exhaust Gas Catalytic Converter for Automobiles |
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| CN100558445C (en) * | 2006-09-15 | 2009-11-11 | 中国石油化工股份有限公司 | The purification method of organic exhaust gas |
| CN201684522U (en) * | 2010-05-31 | 2010-12-29 | 湖北中油环保集团股份有限公司 | Activated carbon adsorption tower |
| CN202044888U (en) * | 2011-03-25 | 2011-11-23 | 天津理工大学 | Automatic high-efficiency energy-saving purification system of volatilizable industrial organic pollutants |
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Inventor after: Zhu Dianxing Inventor before: Zhu Dianxing Inventor before: Liu Guangming Inventor before: Feng Xin Inventor before: Liu Zongyu Inventor before: Zhou Yan Inventor before: Yue Junjie Inventor before: Li Ling |
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Effective date of registration: 20170814 Address after: 300308, Tianjin free trade zone (Tianjin Port Free Trade Zone), No. ten, No. 129, 2039 Haibin Road, room 2 Patentee after: Tianjin Saizhi Science and Technology Development Co., Ltd. Address before: 300384, Tianjin, Nankai District red flag South Road extension line, Tianjin University of Technology main campus, building 17 Patentee before: Tianjin University of Technology |
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