CN203615773U - Comprehensive recycling system of surplus coal gas and saturated steam of steel plant - Google Patents
Comprehensive recycling system of surplus coal gas and saturated steam of steel plant Download PDFInfo
- Publication number
- CN203615773U CN203615773U CN201320828117.XU CN201320828117U CN203615773U CN 203615773 U CN203615773 U CN 203615773U CN 201320828117 U CN201320828117 U CN 201320828117U CN 203615773 U CN203615773 U CN 203615773U
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- gas
- steam
- temperature superheater
- saturated vapor
- coal gas
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- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 239000003034 coal gas Substances 0.000 title claims abstract description 22
- 238000004064 recycling Methods 0.000 title abstract description 5
- 238000003860 storage Methods 0.000 claims description 21
- 239000003245 coal Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 230000005611 electricity Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 35
- 238000010438 heat treatment Methods 0.000 description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 235000014171 carbonated beverage Nutrition 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006392 deoxygenation reaction Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The utility model provides a comprehensive recycling system of surplus coal gas and saturated steam of a steel plant. A coal gas combustion chamber is communicated with a hearth; the hearth is communicated with a flue; a high-temperature superheater, a low-temperature superheater, a high-pressure economizer, a low-pressure economizer and an air pre-heater are respectively arranged in the flue from the bottom up; the hearth is L-shaped, a lower collection box and an upper collection box on the inner wall of the hearth are respectively connected with a steam pocket to form a closed loop; the air pre-heater is respectively communicated with the coal gas combustion chamber and the flue through a primary fan and a secondary fan; a condensate pump, a thermal deaerator, a feed pump, the low-pressure economizer, the high-pressure economizer and the steam pocket are sequentially connected; a heat accumulator and the steam pocket are respectively connected with a steam distribution cylinder. The boiler of the comprehensive recycling system of surplus coal gas and saturated steam of the steel plant superheats the saturated steam by using heat provided by combustion of the surplus coal gas to obtain superheated steam, and then conveys to a steam turbine generator unit through a pipe to generate electricity, and thus the surplus coal gas and saturated steam of the steel plant can be scientifically, effectively and comprehensively utilized.
Description
Technical field
The utility model belongs to steel mill's residual heat and energy and recycles field, relates to a kind of blast furnace, converter surplus gas and saturated vapor utilization system.
Background technology
Ferrous Metallurgy is highly energy-consuming industry, 12 industrial energy saving planning propose, and are recovered as emphasis with process optimization and secondary energy sources, improve the quality of material, fuel, strengthen high efficiency of energy and reclaim, change and utilize technological transformation dynamics, improve secondary energy sources level of comprehensive utilization.
In smelting iron and steel technical process, can produce a large amount of blast furnace, coal gas of converter, wherein except part is for enterprise's steel-making, steel rolling heating, remainder is mostly for combustion power generation or slatterned.In addition, in smelting iron and steel technique, a large amount of saturated vapors that converter evaporated flue produces, because it has pressure, shortcoming that flowed fluctuation is larger, discharge and have wasted as waste gas except minority is utilized major part.
Chinese patent CN202598485U discloses a kind of steel mill afterheat steam heating boiler again, and it can utilize blast furnace gas that saturated vapor is heated and makes superheated steam.Its feature is to comprise body of heater, and there is furnace chamber body of heater inside and is reverse U shape; Insulated combustion chamber is sealed to form in one end of furnace chamber, and there is exhanst gas outlet air preheater below, in the furnace chamber of top, is provided with superheater.The weak point of this patent is only using saturated vapor as heat transferring medium, high to steel mill's dependence, if steel mill produces while seldom or not producing saturated vapor, heating furnace will not have the object of recycling coal gas and saturated vapor.
Chinese patent ZL200720138203.2 discloses a kind of saturated vapor heating furnace, is made up of pressure fan, boiler-burner, burner hearth, saturated vapor import header, superheater, superheated steam outlet header, economizer, feedwater outlet header, air preheater and air-introduced machine.Be characterized in that thermal medium directly adopts saturated vapor; Adopt blast furnace or coal gas of converter to make fuel.The weak point of this patent is that fuel gas is directly transported to combustion chamber after udst separation by workshop, causes heating furnace too to rely on steel mill's production operation situation, thereby flow easily fluctuates and makes superheated steam quality unstable.
Summary of the invention
Above-mentioned mentioned blast furnace, coal gas of converter and saturated vapor are iron and steel enterprise's secondary energy sources, the utility model is just in order to make these steel mill's residual heat and energies change the stable steam that continues effectively to control utilization into, a kind of steel mill surplus gas and saturated vapor utilization system are provided, thereby fully utilized fully, save the energy, reduce atmosphere pollution.
The technical solution adopted in the utility model is as follows:
A kind of steel mill's surplus gas and saturated vapor utilization system, comprise burner hearth, drum, high temperature superheater, low temperature superheater, high-pressure economizer, low-pressure coal saver, air preheater, exhanst gas outlet, gas burner, water-cooling wall, upper collecting chamber, lower header, steel mill's saturated vapor more than needed, gas-distributing cylinder, storage heater, oxygen-eliminating device, direct-contact desuperheater, feed pump, primary air fan, overfire air fan and corresponding pipeline and valve; Wherein, gas burner communicates with burner hearth, and burner hearth communicates with flue, arranges respectively high temperature superheater, low temperature superheater, high-pressure economizer, low-pressure coal saver, air preheater in flue from bottom to top; Steel mill's saturated vapor more than needed is passed into storage heater, and converter gas cabinet and blast furnace coal gas holder are communicated with gas burner; Described burner hearth is L-type, and inboard wall of burner hearth is provided with respectively upper collecting chamber, water-cooling wall, lower header successively, and lower header and upper collecting chamber are connected to form a closed-loop path with drum respectively; Air preheater is communicated with gas burner, flue by primary air fan, overfire air fan respectively; Condensate pump, thermal deaerator, feed pump are connected successively with low-pressure coal saver, high-pressure economizer, drum, and storage heater is connected with gas-distributing cylinder respectively with drum; Gas-distributing cylinder, low temperature superheater, high temperature superheater and Turbo-generator Set are connected successively.
Further, between described high temperature superheater and low temperature superheater, direct-contact desuperheater is installed; Between storage heater and gas-distributing cylinder, be provided with steam reducing valve, between storage heater and steel mill saturated vapor more than needed, be provided with steam overflow valve.
The method concrete steps of utilizing of said system are:
Boiler possesses after entry condition, starts boiler startup step, opens air control valve and gas regulator, and air preheater utilizes the fume afterheat of hearth combustion by cold air heating, and hot blast is delivered to gas burner through primary air fan; Coal gas passes into gas burner by the road by converter gas cabinet and blast furnace coal gas holder, with the more than 1000 ℃ high-temperature flue gas of the hot blast mixed combustion generation of inputting, through burner hearth, flue heat exchange, is finally discharged by exhanst gas outlet, and discharge temperature can drop to below 150 ℃; The feedwater coming from condensate pump is after thermal deaerator deoxygenation, delivered into after the heating of low-pressure coal saver, high-pressure economizer to drum by feed pump, the hot water separating through carbonated drink in drum enters upper collecting chamber through lower header to water-cooling wall heat exchange, and institute's producing steam, to drum, forms a closed-loop path; The saturated vapor separating through carbonated drink in drum enters gas-distributing cylinder; Steel mill's saturated vapor more than needed enters storage heater through steam overflow valve, and the steam after accumulation of energy enters gas-distributing cylinder through steam reducing valve regulation and control again, and mixed vapour is superheated to rated designs parameter through low temperature superheater, high temperature superheater, is delivered to Turbo-generator Set generating.
Boiler of the present utility model utilizes surplus gas burning to provide heat by overheated saturated vapor acquisition superheated steam, is then transported to Turbo-generator Set generating through pipeline, steel mill's surplus gas and saturated vapor scientificlly and effectively can be fully utilized.Be that single utilization coal gas is compared with useless saturated vapor with current conventional art; the utility model comparison Comprehensive has utilized secondary energy sources and has improved boiler performance; increase the output of Boiler Steam amount, introduced the protection of external saturated vapor to superheater, prolonged boiler service life.L-type steam generator system layout is compacter in addition, and the iron and steel enterprise that can adapt to different scales adopts, and is that a kind of range of application is wider, the equipment that adaptability is higher.Concrete advantage is as follows:
1, fully utilized the secondary energy sources in steelmaking process, reduced the discharge of pollutant: steel mill's surplus gas is burnt and produces superheated steam and useless saturated vapor is carried out to overheated recycling;
2, stability and the security of boiler have been strengthened: because boiler self-produced steam has reduced the dependency to process for making, the saturated vapor of introducing again in steelmaking process has avoided boiler to occur that the dry combustion method phenomenon of superheater occurs simultaneously;
3, flue is short, and cigarette speed is higher, can make whole boiler volume dwindle, and floor space is few; Whole boiler is overhung construction, only has downward vertical expansion, and convection heating surface pipe is concentrated through walls in a side, reduce sealing surface, and flue gas does not change flow direction, and heating surface is washed away evenly, and wearing and tearing alleviate;
4, because temperature in burner hearth is higher, so being set, overfire air fan introducing hot blast is used for regulating the flue-gas temperature through superheater, reduce the infringement that excess Temperature causes superheater, extend the life-span of superheater;
5, between steel mill's saturated vapor more than needed and gas-distributing cylinder, storage heater is set, regulates by its energy storage, can make saturated-steam temperature more than needed and flow tend towards stability, thereby ensure steam turbine generator steady-state operation;
6, improving generated energy fundamentally reduces production costs: owing to introducing, saturated vapor is overheated, so increased the generated energy of Turbo-generator Set.
Accompanying drawing explanation
Fig. 1 is a kind of steel mill's surplus gas of the utility model and saturated vapor utilization system and boiler plant.
The specific embodiment
A kind of steel mill surplus gas of the present utility model and saturated vapor utilization system and boiler plant are that blast furnace, coal gas of converter mix (also can be single) combustion gas boiler, described boiler is single drum, Natural Circulation, comprise body, combustion chamber, superheater, economizer and air preheater, burner hearth arranges water-cooling wall in addition; Body of heater lower end is burner hearth, and upper end is flue gas discharge opening.
As seen from Figure 1, a kind of steel mill's surplus gas of the utility model and saturated vapor utilization system and boiler plant are made up of gas burner 3, burner hearth 5, drum 16, high temperature superheater 11, low temperature superheater 10, flue 22, high-pressure economizer 9, low-pressure coal saver 8, air preheater 21, steel mill's saturated vapor 18 more than needed, gas-distributing cylinder 14, water-cooling wall 27, upper collecting chamber 25, lower header 26, storage heater 13, oxygen-eliminating device 15, direct-contact desuperheater 12, feed pump 28, primary air fan 29, overfire air fan 30 and corresponding pipeline and valve; Gas burner 4 communicates with burner hearth 5, arranges respectively high temperature superheater 11, low temperature superheater 10, high-pressure economizer 9, low-pressure coal saver 8, air preheater 21 in flue 22 from bottom to top, and flue gas is finally discharged by exhanst gas outlet 20; Steel mill in storage heater 13 saturated vapor 18 more than needed with converge at gas-distributing cylinder 14 from the saturated vapor of drum 16; Coal gas from converter gas cabinet 1 and blast furnace coal gas holder 2 ignites in gas burner 3, and air preheater 21 provides hot blast 7 combustion-supporting for gas burner 3; Cold wind 6 is exported hot blast 7 through air preheater 21, regulates to control to be respectively delivered to gas burner 3 and flue collector 22 through primary air fan 29, overfire air fan 30; Condensate pump water delivery 17 is after thermal deaerator 15 deoxygenations, carried by feed pump 28, after elder generation after 9 heating of low-pressure coal saver 8, high-pressure economizer to drum 16, the interior hot water separating through carbonated drink of drum 16 enters upper collecting chamber 25 through lower header 26 to water-cooling wall 27 heat exchange, institute's producing steam, to drum 16, forms a closed-loop path; The interior saturated vapor separating through carbonated drink of drum 16 enters gas-distributing cylinder 14; High temperature superheater 11 is provided with direct-contact desuperheater 12 with low temperature superheater 10 intermediate conduit, and feedwater is from deaerated water 4; Between storage heater 13 and gas-distributing cylinder 14, steel mill's saturated vapor 18 more than needed, pipeline arranges respectively steam overflow valve 24, steam reducing valve 23 regulates; Superheated steam is delivered to Turbo-generator Set 19 through pipeline and generates electricity.
The course of work of said system and boiler plant, specific implementation process is as follows:
Boiler possesses after entry condition, starts boiler startup step, opens air control valve and gas regulator, and air preheater 21 utilizes the fume afterheat that burner hearth 5 burns that cold wind 6 is heated, and hot blast 7 is delivered to gas burner 3 through primary air fan 29; Coal gas (converter, blast furnace) passes into gas burner 3 by the road by steel mill's gas chamber, high-temperature flue gas more than producing 1000 ℃ with hot blast 7 mixed combustions of input, through burner hearth 5, flue 22 heat exchange, finally to be discharged by exhanst gas outlet 20, discharge temperature can drop to below 150 ℃; The feedwater 17 coming from condensate pump is after thermal de-aeration, after delivering into low-pressure coal saver 8, high-pressure economizer 9 and heat by feed pump 28 to drum 16, the interior hot water separating through carbonated drink of drum 16 changes 27 heat through lower header 26 to water-cooling wall and enters upper collecting chamber 25, institute's producing steam, to drum 16, forms a closed-loop path; The interior saturated vapor separating through carbonated drink of drum 16 enters gas-distributing cylinder 14; Steel mill's 18 of saturated vapors more than needed enter storage heater 13 through steam overflow valve 24, steam after accumulation of energy enters gas-distributing cylinder 14 through steam reducing valve 23 regulation and control again, mixed vapour is superheated to rated designs parameter through low temperature superheater 10, high temperature superheater 11, is delivered to Turbo-generator Set 19 and generates electricity.
Direct-contact desuperheater 12(feedwater is installed between high temperature superheater 11 and low temperature superheater 10 to be come by oxygen-eliminating device), regulate outlet steam temperature by it, protection superheater.Hot blast 7 enters the front flue of high temperature superheater 11 by overfire air fan 30 regulation and control, is that being unlikely to excess Temperature affects the superheater life-span in order rationally to control the front flue-gas temperature of high temperature superheater 11.
Between steel mill's saturated vapor more than needed and gas-distributing cylinder, storage heater 13 is set in addition, regulates by its energy storage, can make saturated-steam temperature more than needed and flow tend towards stability, thereby ensure steam turbine generator steady-state operation.When steel mill is more than needed, saturated vapor is more while exceeding boiler load, and excess steam is input to storage heater 13 internal water is heated to accumulation of energy; When coal gas is not enough or interruption, or when steel mill's saturated vapor fluctuation more than needed or deficiency, regulate by the steam reducing valve 23 of storage heater 13, the high temperature saturation water in storage heater 13 flashes to rapidly steam, be input to gas-distributing cylinder 14, thereby provide stable steam to superheater.When the interior steam of gas-distributing cylinder 14 is inputted superheater continuously, while causing the interior steam pressure of gas-distributing cylinder 14 to reduce, by the adjusting of steam reducing valve 23, storage heater 13 internal pressures reduce external heat release, can make high temperature saturation water flash to steam, supplement the interior steam of gas-distributing cylinder 14, thereby it is stable to maintain the steam parameter that gas-distributing cylinder 14 exports, guaranteeing provides stable and sufficient steam to Turbo-generator Set 19.
Produce superheated steam and utilize its waste heat to remove the saturated vapor in overheated steelmaking process by utilizing coal gas to burn, this technical scheme had both reduced the dependence of boiler to steel mill, can make again the stable output in large quantities of boiler, improve steam quality, be conducive to Turbo-generator Set operation.In addition, than inverted U boiler, the utility model adopts the advantage of L-type boiler to be: flue gas upwards flows always, and burner hearth can be square, and surrounding can arrange that fin panel casing is to upper furnace, so that hydrophobic; Flue is short, and cigarette speed is higher, can make whole boiler volume dwindle, and floor space is few; Whole boiler is overhung construction, only has downward vertical expansion, and convection heating surface pipe is concentrated through walls in a side, reduce sealing surface, and flue gas does not change flow direction, and heating surface is washed away evenly, and wearing and tearing alleviate.
Claims (2)
1. steel mill's surplus gas and saturated vapor utilization system, comprise burner hearth (5), drum (16), high temperature superheater (11), low temperature superheater (10), high-pressure economizer (9), low-pressure coal saver (8), air preheater (21), exhanst gas outlet (20), gas burner (3), water-cooling wall (27), upper collecting chamber (25), lower header (26), steel mill's saturated vapor (18) of having more than needed, gas-distributing cylinder (14), storage heater (13), oxygen-eliminating device (15), direct-contact desuperheater (12), feed pump (28), primary air fan (29), overfire air fan (30) and corresponding pipeline and valve, wherein, gas burner (3) communicates with burner hearth (5), burner hearth (5) communicates with flue (22), arranges respectively high temperature superheater (11), low temperature superheater (10), high-pressure economizer (9), low-pressure coal saver (8), air preheater (21) in flue (22) from bottom to top, steel mill's saturated vapor (18) of having more than needed is passed into storage heater (13), converter gas cabinet (1) and blast furnace coal gas holder (2) and gas burner (3), it is characterized in that, described burner hearth (5) is L-type, burner hearth (5) inwall is provided with respectively upper collecting chamber (25), water-cooling wall (27), lower header (26) successively, and lower header (26) is connected to form a closed-loop path with drum (16) respectively with upper collecting chamber (25),
Air preheater (21) is communicated with gas burner (3), flue (22) by primary air fan (29), overfire air fan (30) respectively;
Condensate pump, thermal deaerator (15), feed pump (28) are connected successively with low-pressure coal saver (8), high-pressure economizer (9), drum (16), and storage heater (13) is connected with gas-distributing cylinder (14) respectively with drum (16); Gas-distributing cylinder (14), low temperature superheater (10), high temperature superheater (11) and Turbo-generator Set (19) are connected successively.
2. a kind of steel mill surplus gas according to claim 1 and saturated vapor utilization system, is characterized in that, between described high temperature superheater (11) and low temperature superheater (10), direct-contact desuperheater (12) is installed; Between storage heater (13) and gas-distributing cylinder (14), be provided with steam reducing valve (23), between storage heater (13) and steel mill saturated vapor (18) more than needed, be provided with steam overflow valve (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320828117.XU CN203615773U (en) | 2013-12-13 | 2013-12-13 | Comprehensive recycling system of surplus coal gas and saturated steam of steel plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320828117.XU CN203615773U (en) | 2013-12-13 | 2013-12-13 | Comprehensive recycling system of surplus coal gas and saturated steam of steel plant |
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| Publication Number | Publication Date |
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| CN203615773U true CN203615773U (en) | 2014-05-28 |
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| CN201320828117.XU Expired - Lifetime CN203615773U (en) | 2013-12-13 | 2013-12-13 | Comprehensive recycling system of surplus coal gas and saturated steam of steel plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673650A (en) * | 2013-12-13 | 2014-03-26 | 南京凯盛开能环保能源有限公司 | Steel mill surplus gas and sanitary steam comprehensive utilization system and method |
-
2013
- 2013-12-13 CN CN201320828117.XU patent/CN203615773U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673650A (en) * | 2013-12-13 | 2014-03-26 | 南京凯盛开能环保能源有限公司 | Steel mill surplus gas and sanitary steam comprehensive utilization system and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140528 |
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| CX01 | Expiry of patent term |