CN104214990B - A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system and method - Google Patents
A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system and method Download PDFInfo
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- CN104214990B CN104214990B CN201410410943.1A CN201410410943A CN104214990B CN 104214990 B CN104214990 B CN 104214990B CN 201410410943 A CN201410410943 A CN 201410410943A CN 104214990 B CN104214990 B CN 104214990B
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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
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Sorption Type Refrigeration Machines (AREA)
Abstract
The present invention relates to a kind of coal oven dithio-gas sensible heat and reclaim water refrigeration system and method. this system comprises the tedge of tandem connection, bridge tube, discharge, gas-liquid separator, mechanical settling tank, oil-circulating ammonia water tank, cyclic ammonia water pump and lithium bromide refrigerator, in tedge, the raw coke oven gas of 700 DEG C of left and right is recycled ammoniacal liquor sprinkling and is cooled to about 83(± 5 in the time of bridge tube) DEG C, approximately 83(± 5 after heat absorption) DEG C cyclic ammonia water flows in mechanical settling tank and tar separation after discharge separates with coal gas with gas-liquid separator, ammoniacal liquor after separation directly pumps into lithium bromide refrigerator after entering oil-circulating ammonia water tank, ammoniacal liquor after lithium bromide refrigerator heat absorption pumps into bridge tube circulation and sprays cooling raw coke oven gas. coal oven dithio-gas sensible heat recovery water refrigeration system of the present invention and method are directly using cyclic ammonia water simultaneously as heat-absorbing medium and thermal source, substitute first with the warm water after cyclic ammonia water and cold water heat exchange as thermal source for freezing, effectively avoid the waste of the energy, improved the thermal efficiency.
Description
Technical field
The present invention relates to coking industry heat recovery field, particularly the coal oven dithio-gas sensible heat of a kind of coke oven coke oven uprising tube crude-gas sensible heat and cyclic ammonia water UTILIZATION OF VESIDUAL HEAT IN reclaims water refrigeration system and method.
Background technology
Coal tar is that coking coal is heated to 950 ~ 1050 DEG C under isolated air conditions, produces the technical process of coke, coke-stove gas and coking chemistry product through high-temperature retorting. Wherein, from carbonization chamber, the temperature in the time that tedge is overflowed is 700 DEG C of left and right to coke-stove gas, now in coal gas, contain tar gas, benzene hydrocarbon, steam, ammonia, hydrogen sulfide, hydrogen cyanide, naphthalene and other compounds, for reclaiming and process these compounds, in bridge tube and discharge, spray with a large amount of cyclic ammonia waters, in the time that the ammoniacal liquor of fine mist fully contacts with raw coke oven gas, because gas temperature is very high, humidity is very low, therefore coal gas is emitted a large amount of sensible heats and is cooled to 83(± 5) DEG C left and right, ammoniacal liquor absorbs amount of heat and is warming up to 83(± 5) DEG C left and right. Cyclic ammonia water carries the tar that is cooled and flow into mechanical settling tank and tar separation after discharge separates with coal gas with gas-liquid separator, and after separating, ammoniacal liquor enters oil-circulating ammonia water tank and pumps into bridge tube and recycle. The heat that in this system, cyclic ammonia water carries wastes in atmosphere, has caused the waste of the energy.
At present, seldom there is the waste heat in crude-gas sensible heat and cyclic ammonia water in pair tedge effectively to recycle. Obviously mainly contain aspect recovery at raw coke oven gas: adopt the tedge device with function of recovering waste heat, as tedge outer wall installs semi-conductor thermo-electric generation module additional for generating, tedge installs water leg outward additional for generation of steam-electric power etc., but due to narrow space, heating surface is arranged and is affected, cannot fully reclaim crude-gas sensible heat, and equipment produces that leak source time impact is normal produces, cause being difficult to promoting; Adopt raw coke oven gas is concentrated and drawn, concentrated residual neat recovering system is set in addition, this kind of tactic pattern, because combustibility, the tar of its system complex, raw coke oven gas are separated out the factors such as coking, causes the air-tightness requirement of system very high, and system safety operation is subject to very large challenge; In the tedge of coke oven, superheater is set, evaporimeter is set in bridge tube, and demineralized water reclaims heat for generation of steam by superheater and evaporimeter, but bonds and stop up tube wall owing to existing in this technique, install the problems such as the perishable difficult replacing of equipment additional, be difficult to long-time steady operation. Aspect cyclic ammonia water UTILIZATION OF VESIDUAL HEAT IN mainly by: in mechanical settling tank, install heat transmission equipment additional, cyclic ammonia water waste heat is utilized, its concrete scheme is: cyclic ammonia water is heated recirculated water by heat transmission equipment, then the recirculated water after heating is passed into heating equipment or Absorption Refrigerator use, but there is following drawback in this system: one, use heat transmission equipment, reduced cyclic ammonia water heat utilization rate; Two, the recirculated water after heating is limited service time for heating, and heating line laying is longer, and heat leakage is large, invests also larger; Three, the circulating water temperature after heating is lower, again carries out heat exchange for Absorption Refrigerator, and refrigerating efficiency is lower. Cyclic ammonia water is substituted to steam in the past and wash just cold tower, the advantage of the method is to have reduced steam to wash the environmental pollution that tower causes, but few owing to regularly washing tower consumption, can not effectively more recycle the heat of cyclic ammonia water. Utilize the heat of cyclic ammonia water to heat the remained ammonia in negative pressure ammonia still, but after there is cyclic ammonia water and remained ammonia heat exchange, remained ammonia temperature is lower, ammonia still process effect is not clearly.
Therefore, how rationally and effectively to improving coking system crude-gas sensible heat and cyclic ammonia water heat recovery efficiency, be, current urgent problem.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art provide a kind of directly using cyclic ammonia water simultaneously as heat-absorbing medium and thermal source and be applied to the raising thermal efficiency that absorbs crude-gas sensible heat and drive lithium-bromide absorption-type refrigerating machine, the coal oven dithio-gas sensible heat of saving the energy reclaims water refrigeration system and method.
Technical scheme of the present invention is achieved in that a kind of coal oven dithio-gas sensible heat reclaims water refrigeration system, this system comprises coke oven, on described coke oven, be connected with tedge, described tedge is connected with bridge tube, described bridge tube is connected on a discharge, described discharge is connected on a gas-liquid separator, described gas-liquid separator is connected with the mechanical settling tank that is arranged on its downstream, described mechanical settling tank is connected with an oil-circulating ammonia water tank, on described oil-circulating ammonia water tank, connect one first cyclic ammonia water pump, described the first cyclic ammonia water pump is connected on described bridge tube and lithium-bromide absorption-type refrigerating machine by a threeway pipeline, on described threeway pipeline, be respectively equipped with the stop valve that can realize single lead control, on described lithium-bromide absorption-type refrigerating machine, be also connected with one second cyclic ammonia water pump, described the second cyclic ammonia water pump is connected with described bridge tube by the pipeline that is provided with stop valve, on described lithium-bromide absorption-type refrigerating machine, be provided with an intake tunnel and an exhalant canal.
The generator material of described lithium-bromide absorption-type refrigerating machine inside adopts stainless steel composite plate material.
A kind of coal oven dithio-gas sensible heat reclaims chilled water method, the method comprises: the ammoniacal liquor that the raw coke oven gas of 700 DEG C of left and right is pumped into by the second cyclic ammonia water in bridge tube sprays and is cooled to 78 ~ 88 DEG C, bridge tube is connected with discharge, 78 ~ 88 DEG C of cyclic ammonia waters after heat absorption and tar mixed liquor flow to gas-liquid separator along inhaling gas piping in discharge, after gas-liquid separation, cyclic ammonia water and tar mixed liquor flow into mechanical settling tank, cyclic ammonia water and the tar different and separation by density in mechanical settling tank, cyclic ammonia water after separation flows in oil-circulating ammonia water tank, in oil-circulating ammonia water tank, 78 ~ 88 DEG C of cyclic ammonia waters directly pump into lithium-bromide absorption-type refrigerating machine by the first cyclic ammonia water pump as thermal source, process and form 68 ~ 78 DEG C of ammoniacal liquor after heat release and directly pump into bridge tube by the second cyclic ammonia water pump and circulate through lithium-bromide absorption-type refrigerating machine.
Lithium-bromide absorption-type refrigerating machine process of refrigerastion is specific as follows: when lithium bromide water solution is subject to after the heating of thermal cycle ammoniacal liquor in generator, the water in solution is constantly vaporized; Along with the continuous vaporization of water, the lithium bromide water solution concentration in generator constantly raises, and enters absorber; Water vapour enters condenser, after the cooling agent cooling being condensed in device, condenses, and becomes the aqueous water of high pressure low temperature; In the time that the water in condenser enters evaporimeter by choke valve, rapid expansion and vaporizing, and in vaporescence a large amount of heats that absorb chilled water in evaporimeters, thereby reach the object of cooling refrigeration; Meanwhile, water at low temperature steam enters absorber, and the lithium bromide water solution being absorbed in device absorbs, and solution concentration progressively reduces, then sends generator back to by circulating pump, completes whole circulation.
What in described lithium-bromide absorption-type refrigerating machine, pass into is the cold water of 21 ~ 25 DEG C under cooling tower, generation be the cold water of 14 ~ 18 DEG C, the cold water of generation be incorporated to water at low temperature pipe network for first cold tower and final cooling tower further cooling to coal gas.
The good effect that technical scheme of the present invention produces is as follows: coal oven dithio-gas sensible heat recovery water refrigeration system of the present invention and method are directly using cyclic ammonia water simultaneously as heat-absorbing medium and thermal source, be applied to and absorb crude-gas sensible heat and drive lithium-bromide absorption-type refrigerating machine, avoid tedge to install the risk that heat transmission equipment brings additional, substitute first with the warm water after cyclic ammonia water and cold water heat exchange as thermal source for freezing, both reclaimed crude-gas sensible heat, improve the thermal efficiency, reclaim again the heat of system to environmental emission, effectively avoid the waste of the energy, meet energy-conserving and environment-protective requirement.
The generator of described lithium-bromide absorption-type refrigerating machine inside adopts stainless steel composite plate material, stainless steel clad plate generator adopts explosive welding (EW) connection to produce, both improve the corrosion resistance of generator, avoided again a corrosivity difficult problem that adopts the material such as ferrous metal and red copper to bring.
Brief description of the drawings
Fig. 1 is that coal oven dithio-gas sensible heat of the present invention reclaims chilled water schematic flow sheet.
In figure, be labeled as: 1, coke oven; 2, tedge; 3, bridge tube; 4, discharge; 5, gas-liquid separator; 6, mechanical settling tank; 7, oil-circulating ammonia water tank; 8, the first cyclic ammonia water pump; 9, lithium-bromide absorption-type refrigerating machine; 10, the second cyclic ammonia water pump; 11, stop valve; 12, intake tunnel; 13, exhalant canal.
Note: in figure, the arrow at exhalant canal and intake tunnel two places represents the flow direction of water, all the other all arrows all represent that cyclic ammonia water reclaims the flow direction in water refrigeration system at coal oven dithio-gas sensible heat.
Detailed description of the invention
Embodiment mono-
A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system, this system comprises coke oven 1, on described coke oven, be connected with tedge 2, described tedge is connected with bridge tube 3, described bridge tube is connected on a discharge 4, described discharge is connected on a gas-liquid separator 5, described gas-liquid separator is connected with the mechanical settling tank 6 that is arranged on its downstream, described mechanical settling tank is connected with an oil-circulating ammonia water tank 7, on described oil-circulating ammonia water tank, connect one first cyclic ammonia water pump 8, described the first cyclic ammonia water pump is connected on described bridge tube and lithium-bromide absorption-type refrigerating machine 9 by a threeway pipeline, on described threeway pipeline, be respectively equipped with the stop valve 11 that can realize single lead control, on described lithium-bromide absorption-type refrigerating machine, be also connected with one second cyclic ammonia water pump 10, described the second cyclic ammonia water pump is connected with described bridge tube by the pipeline that is provided with stop valve, on described lithium-bromide absorption-type refrigerating machine, be provided with an intake tunnel 12 and an exhalant canal 13.
The material of the generator of described lithium-bromide absorption-type refrigerating machine inside adopts stainless steel composite plate material, it is again stainless steel clad plate generator, stainless steel clad plate generator adopts explosive welding (EW) connection to produce, both improve the corrosion resistance of generator, avoided again a corrosivity difficult problem that adopts the material such as ferrous metal and red copper to bring.
The above-mentioned threeway pipeline that is provided with stop valve, installs in stop valve process and adopts press and open holes technology, neither affects the normal production of coke oven, again can retain original system equipment as basis for subsequent use on, realize the safe and effective operation of new system.
What described intake tunnel passed into is under the cooling tower cold water of 21 ~ 25 DEG C, at lithium-bromide absorption-type refrigerating machine, inner what produce is the cold water of 14 ~ 18 DEG C, be exhalant canal inside cold water out, the cold water of generation be incorporated to water at low temperature pipe network for first cold tower and final cooling tower further cooling to coal gas.
Embodiment bis-
A kind of coal oven dithio-gas sensible heat reclaims chilled water method, utilize a kind of described coal oven dithio-gas sensible heat of above-described embodiment to reclaim water refrigeration system, the method is as follows: the ammoniacal liquor that the raw coke oven gas of 700 DEG C of left and right is sent into by the second cyclic ammonia water pump 10 in bridge tube 3 sprays and is cooled to 78 ~ 88 DEG C, bridge tube is connected with discharge 4, 78 ~ 88 DEG C of cyclic ammonia waters after heat absorption and tar mixed liquor flow to gas-liquid separator 5 along inhaling gas piping in discharge, after gas-liquid separation, cyclic ammonia water and tar mixed liquor flow into mechanical settling tank 6, cyclic ammonia water and the tar different and separation by density in mechanical settling tank, cyclic ammonia water after separation flows in oil-circulating ammonia water tank 7, in oil-circulating ammonia water tank, 78 ~ 88 DEG C of cyclic ammonia waters directly pump into lithium-bromide absorption-type refrigerating machine 9 by the first cyclic ammonia water pump 8 as thermal source, process and form 68 ~ 78 DEG C of ammoniacal liquor after heat release and directly pump into bridge tube by the second cyclic ammonia water pump 10 and circulate through lithium-bromide absorption-type refrigerating machine.
Lithium-bromide absorption-type refrigerating machine process of refrigerastion is specific as follows: when lithium bromide water solution is subject to after the heating of thermal cycle ammoniacal liquor in generator, the water in solution is constantly vaporized; Along with the continuous vaporization of water, the lithium bromide water solution concentration in generator constantly raises, and enters absorber; Water vapour enters condenser, after the cooling agent cooling being condensed in device, condenses, and becomes the aqueous water of high pressure low temperature; In the time that the water in condenser enters evaporimeter by choke valve, rapid expansion and vaporizing, and in vaporescence a large amount of heats that absorb chilled water in evaporimeters, thereby reach the object of cooling refrigeration; Meanwhile, water at low temperature steam enters absorber, and the lithium bromide water solution being absorbed in device absorbs, and solution concentration progressively reduces, then sends generator back to by circulating pump, completes whole circulation.
What in described lithium-bromide absorption-type refrigerating machine, pass into is the cold water of 21 ~ 25 DEG C under cooling tower, generation be the cold water of 14 ~ 18 DEG C, the cold water of generation be incorporated to water at low temperature pipe network for first cold tower and final cooling tower further cooling to coal gas.
In the present embodiment, coal oven dithio-gas sensible heat recovery water refrigeration system is that the coal oven dithio-gas sensible heat described in embodiment mono-reclaims water refrigeration system, and this is no longer going to repeat them.
Claims (5)
1. a coal oven dithio-gas sensible heat reclaims water refrigeration system, it is characterized in that: this system comprises coke oven, on described coke oven, be connected with tedge, described tedge is connected with bridge tube, described bridge tube is connected on a discharge, described discharge is connected on a gas-liquid separator, described gas-liquid separator is connected with the mechanical settling tank that is arranged on its downstream, described mechanical settling tank is connected with an oil-circulating ammonia water tank, on described oil-circulating ammonia water tank, connect one first cyclic ammonia water pump, described the first cyclic ammonia water pump is connected on described bridge tube and lithium-bromide absorption-type refrigerating machine by a threeway pipeline, on described threeway pipeline, be respectively equipped with the stop valve that can realize single lead control, on described lithium-bromide absorption-type refrigerating machine, be also connected with one second cyclic ammonia water pump, described the second cyclic ammonia water pump is connected with described bridge tube by the pipeline that is provided with stop valve, on described lithium-bromide absorption-type refrigerating machine, be provided with an intake tunnel and an exhalant canal.
2. a kind of coal oven dithio-gas sensible heat according to claim 1 reclaims water refrigeration system, it is characterized in that: the generator material of described lithium-bromide absorption-type refrigerating machine inside adopts stainless steel composite plate material.
3. one kind is utilized system as described in claim 1 to carry out coal oven dithio-gas sensible heat recovery chilled water method, it is characterized in that: the method comprises: the ammoniacal liquor that the raw coke oven gas of 700 DEG C of left and right is pumped into by the second cyclic ammonia water in bridge tube sprays and is cooled to 78 ~ 88 DEG C, bridge tube is connected with discharge, 78 ~ 88 DEG C of cyclic ammonia waters after heat absorption and tar mixed liquor flow to gas-liquid separator along inhaling gas piping in discharge, after gas-liquid separation, cyclic ammonia water and tar mixed liquor flow into mechanical settling tank, cyclic ammonia water and the tar different and separation by density in mechanical settling tank, cyclic ammonia water after separation flows in oil-circulating ammonia water tank, in oil-circulating ammonia water tank, 78 ~ 88 DEG C of cyclic ammonia waters directly pump into lithium-bromide absorption-type refrigerating machine by the first cyclic ammonia water pump as thermal source, process and form 68 ~ 78 DEG C of ammoniacal liquor after heat release and directly pump into bridge tube by the second cyclic ammonia water pump and circulate through lithium-bromide absorption-type refrigerating machine.
4. a kind of coal oven dithio-gas sensible heat according to claim 3 reclaims chilled water method, it is characterized in that: lithium-bromide absorption-type refrigerating machine process of refrigerastion is specific as follows: when lithium bromide water solution is subject to after the heating of thermal cycle ammoniacal liquor in generator, the water in solution is constantly vaporized; Along with the continuous vaporization of water, the lithium bromide water solution concentration in generator constantly raises, and enters absorber; Water vapour enters condenser, after the cooling agent cooling being condensed in device, condenses, and becomes the aqueous water of high pressure low temperature; In the time that the water in condenser enters evaporimeter by choke valve, rapid expansion and vaporizing, and in vaporescence a large amount of heats that absorb chilled water in evaporimeters, thereby reach the object of cooling refrigeration; Meanwhile, water at low temperature steam enters absorber, and the lithium bromide water solution being absorbed in device absorbs, and solution concentration progressively reduces, then sends generator back to by circulating pump, completes whole circulation.
5. a kind of coal oven dithio-gas sensible heat according to claim 3 reclaims chilled water method, it is characterized in that: what in described lithium-bromide absorption-type refrigerating machine, pass into is the cold water of 21 ~ 25 DEG C under cooling tower, what produce is the cold water of 14 ~ 18 DEG C, the cold water of generation be incorporated to water at low temperature pipe network for first cold tower and final cooling tower further cooling to coal gas.
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| CN201410410943.1A CN104214990B (en) | 2014-08-20 | 2014-08-20 | A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system and method |
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| CN201410410943.1A CN104214990B (en) | 2014-08-20 | 2014-08-20 | A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system and method |
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| CN104214990B true CN104214990B (en) | 2016-05-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104629816B (en) * | 2015-01-30 | 2016-09-28 | 济南冶金化工设备有限公司 | From the preliminary chiller of refrigeration mode coal oven dithio-gas |
| CN104727872A (en) * | 2015-03-25 | 2015-06-24 | 山东钢铁股份有限公司 | Coke oven gas waste heat power generation system |
| CN106766342B (en) * | 2016-12-12 | 2022-07-05 | 松下制冷（大连）有限公司 | System for recovering ammonia steam waste heat at top of ammonia still tower by using lithium bromide absorption heat pump |
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| DE3609702A1 (en) * | 1986-03-20 | 1987-11-26 | Helmut Dipl Ing Pfab | System for the combined generation of electricity, heat and cold |
| CN102827623A (en) * | 2012-09-07 | 2012-12-19 | 云南大为制焦有限公司 | Method and system for recycling waste heat of ammonia water |
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| CN203346328U (en) * | 2013-06-19 | 2013-12-18 | 河南中鸿集团煤化有限公司 | Raw gas recovery and tar collecting device for test coke oven |
| CN204063677U (en) * | 2014-08-20 | 2014-12-31 | 河南中鸿集团煤化有限公司 | A kind of coal oven dithio-gas Exposure degree water refrigeration system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8529679B2 (en) * | 2009-11-05 | 2013-09-10 | General Electric Company | System and method for improving performance of an IGCC power plant |
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| DE3609702A1 (en) * | 1986-03-20 | 1987-11-26 | Helmut Dipl Ing Pfab | System for the combined generation of electricity, heat and cold |
| CN102827623A (en) * | 2012-09-07 | 2012-12-19 | 云南大为制焦有限公司 | Method and system for recycling waste heat of ammonia water |
| CN203323218U (en) * | 2013-06-13 | 2013-12-04 | 烟台龙源电力技术股份有限公司 | Boiler flue gas waste heat heating system |
| CN203346328U (en) * | 2013-06-19 | 2013-12-18 | 河南中鸿集团煤化有限公司 | Raw gas recovery and tar collecting device for test coke oven |
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Effective date of registration: 20180214 Address after: No. 14, No. 1407, No. 33, No. 14, agricultural road, Jinshui District, Zhengzhou, Henan Patentee after: Henan neutron star energy saving Technology Co., Ltd. Address before: Hung Road Shilong District of Pingdingshan City, Henan province 467045 No. 2 Patentee before: Henan Zhonghong Group Coal Chemical Industry Co., Ltd. |
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Effective date of registration: 20190531 Address after: Room 2203-2, 22nd floor, Wangting International Building, No. 80 Zhangbajie High-tech Road, Xi'an High-tech Zone, Shaanxi Province, 710000 Patentee after: Jujin Tongbo Energy Saving Technology Co., Ltd. Address before: 450000 Layer 1407, No. 33 East Agricultural Road, Jinshui District, Zhengzhou City, Henan Province Patentee before: Henan neutron star energy saving Technology Co., Ltd. |