CN102502903A - System and process for realizing zero emission of coal gas and steam of iron and steel plant by utilizing seawater desalination - Google Patents
System and process for realizing zero emission of coal gas and steam of iron and steel plant by utilizing seawater desalination Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000013535 sea water Substances 0.000 title claims abstract description 39
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 17
- 239000010959 steel Substances 0.000 title claims abstract description 17
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 10
- 239000003034 coal gas Substances 0.000 title claims description 182
- 238000000034 method Methods 0.000 title claims description 23
- 239000007789 gas Substances 0.000 claims abstract description 189
- 239000002918 waste heat Substances 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000571 coke Substances 0.000 claims abstract description 14
- 238000005516 engineering process Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000004880 explosion Methods 0.000 claims description 84
- 239000000203 mixture Substances 0.000 claims description 41
- 238000001816 cooling Methods 0.000 claims description 19
- 230000000295 complement effect Effects 0.000 claims description 16
- 239000000284 extract Substances 0.000 claims description 10
- 230000001603 reducing effect Effects 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012797 qualification Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
利用海水淡化实现钢铁厂煤气、蒸汽零排放的系统及工艺，属于钢铁厂二次能源综合利用技术领域，特别涉及利用低温多效海水淡化将煤气、蒸汽资源转化成水资源。该系统包括高炉煤气柜、焦炉煤气柜、转炉煤气柜、煤气调配增压系统、全烧/掺烧煤气电站锅炉、蒸汽轮机、工业锅炉、蒸汽管网、余能余热回收装置、减温减压装置、TVC装置、MED装置。将钢铁厂生产工序消耗不了的剩余煤气用于全烧/掺烧煤气锅炉和/或工业锅炉，通过燃烧产生蒸汽，与钢铁厂回收的蒸汽在合理分级的前提下，通过MED装置制取淡化水。同现有技术相比本发明能极限回收钢铁厂煤气、蒸汽资源，有很好的经济效果，适用于沿海钢铁厂的节能减排。
The system and technology for realizing zero discharge of gas and steam in iron and steel plants by using seawater desalination belong to the technical field of comprehensive utilization of secondary energy in iron and steel plants, and in particular involve the use of low-temperature multi-effect seawater desalination to convert gas and steam resources into water resources. The system includes blast furnace gas cabinets, coke oven gas cabinets, converter gas cabinets, gas distribution pressurization system, full-fired/mixed-fired gas power plant boilers, steam turbines, industrial boilers, steam pipe networks, waste energy and waste heat recovery devices, temperature reduction pressure device, TVC device, MED device. The remaining gas that cannot be consumed in the production process of the iron and steel plant is used in full-fired/mixed-fired gas boilers and/or industrial boilers to generate steam through combustion, and the steam recovered by the iron and steel plant is reasonably graded to produce desalinated water through the MED device . Compared with the prior art, the invention can limit the recovery of gas and steam resources in iron and steel plants, has good economic effect, and is suitable for energy saving and emission reduction in coastal iron and steel plants.
Description
Technical field
The invention belongs to Iron And Steel Plant secondhand energy comprehensive utilization technique field, particularly a kind of low-temperature multiple-effect seawater desalination that utilizes becomes the system and the technology of water resources with coal gas, steam resource conversion, is applicable to the energy-saving and emission-reduction of coastal Iron And Steel Plant.
Background technology
Iron and steel enterprise at high temperature carries out owing to the production technique major part, so " complementary energy " or residual activity resource are quite abundant.Coal gas, vapor recovery utilization are that iron and steel enterprise realizes an important content of " energy-saving and emission-reduction ", to the recovery of coal gas, steam not only save energy but also environmental benefit is arranged.
At present, iron and steel enterprise does not still have the report of realizing coal gas, steam zero release through sea water desaltination both at home and abroad.Patent " utilizes low temperature and low pressure steam to carry out the technology of sea water desaltination "; Application number 200810103167.5 relates to a kind of technology of utilizing low temperature and low pressure steam to carry out sea water desaltination; This technology mainly is that the LT-MED device is set behind turbine; The LT-MED device is the main generating condenser function that has concurrently with the seawater desalination functions; Utilize of the heating steam of the low-quality steam of the terminal low-temp low-pressure of steam turbine, realize that the LT-MED device directly uses low temperature and low pressure steam to carry out the purpose of sea water desaltination as sea water desaltination.In addition; One or two TVC device is set on the LT-MED device; Can utilize the higher steam more than needed of other pressure with the compression of the LP steam that produces in the LT-MED device obtaining more heating steam, and then improve system's producing water ratio and water generation ratio, and the operation of feasible system multi-state.This technology not only can reduce the running cost of sea water desaltination significantly, can also save the investment that condenser is set and auxiliary facilities such as cooling are set for condenser for turbine.Yet this patent can only be utilized the heating steam of the low-quality steam of the terminal low-temp low-pressure of steam turbine as sea water desaltination, can not solve all the other low temperature and low pressure steams of iron and steel enterprise and in, the problem of LP steam discharging.
There are following subject matter in existing Iron And Steel Plant coal gas, vapor recovery utilization: 1. a large amount of low-quality steam can not economic utilizations and have been discharged; 2. steam is difficult to store, and coal gas also is difficult for storing, transportation inconvenience, even go generating, because generating is higher to the quality requirements of coal gas, steam, and electricity also is difficult to effective storage, diffuses in a large number so still exist.In view of the above problems, should update coal gas, vapor recovery is utilized system, its key problem is to make full use of coal gas, steam, overcomes the storage characteristics that is difficult for of coal gas, steam.
Summary of the invention
The object of the present invention is to provide the system and the technology of a kind of Iron And Steel Plant coal gas, steam utilization; Coal gas is generated electricity through boiler combustion; Produce desalination water with steam through low-temperature multiple-effect seawater desalination; Fully efficient the utilization and the classification utilization of steam of realizing coal gas reaches that coal gas, steam efficiently utilize and the purpose of zero release.
System of the present invention comprises blast furnace gas cabinet 1, coke-oven gas cabinet 2, converter gas cabinet 3, coal gas allotment supercharging system 4, clean burn/the mix station boiler 5 that burns gas, steam turbine 6, Industrial Boiler 7, steam pipe system 8, complementary energy waste-heat recovery device 9, reducing-and-cooling plant 10, TVC (English thermal vapor compression; English abbreviation is TVC; The steam heat compression) device 11, MED (English low temperature multiple effect distillation; English abbreviation is MED, low-temperature multiple-effect seawater desalination) device 12, low LP steam 13, in, LP steam 14.Wherein, blast furnace gas cabinet 1, coke-oven gas cabinet 2, converter gas cabinet 3 are connected through gas line with coal gas allotment supercharging system 4 respectively, coal gas allotment supercharging system 4 respectively with clean burn/mix the station boiler 5 that burns gas to be connected with Industrial Boiler 7; Clean burn/mix between the station boiler 5 that burns gas, steam turbine 6, Industrial Boiler 7, steam pipe system 8, complementary energy waste-heat recovery device 9, reducing-and-cooling plant 10, TVC device 11, the MED device 12 connects through steam-pipe accordingly; Wherein the low LP steam 13 in the MED device 12 extraction steam turbines 6 when utilizing low LP steam 13 to desalinize seawater, plays the effect that substitutes the steam turbine condensing surface; The low LP steam 13 that complementary energy waste-heat recovery device 9 produces is transported to MED device 12 through steam-pipe; Complementary energy waste-heat recovery device 9 produce in, LP steam 14 is transported in the steam pipe system 8 through steam-pipe; Get into the TVC device through reducing-and-cooling plant then, unite with the MED device and carry out sea water desaltination.
Coal gas allotment supercharging system 4 comprises blast furnace gas 15, coke-oven gas 16, coal gas of converter 17, condensed water 18, coal gas explosion reverse checkvalve 19, coal gas homogeneous jar 20, gas relief valve 21, water discharging valve 22, coal gas supercharger 23.Wherein every group of coal gas homogeneous supercharging system comprises the coal gas explosion reverse checkvalve 19C on small transfer line between coal gas explosion reverse checkvalve 19A on the blast furnace gas main pipe line and the coal gas explosion reverse checkvalve 19B; Coal gas explosion reverse checkvalve 19F on small transfer line between coal gas explosion reverse checkvalve 19D on the coke-oven gas main pipe line and the coal gas explosion reverse checkvalve 19E; Coal gas explosion reverse checkvalve 19K on small transfer line between coal gas explosion reverse checkvalve 19G on the coal gas of converter main pipe line and the coal gas explosion reverse checkvalve 19H; Coal gas homogeneous jar 20; Gas relief valve 21; Water discharging valve 22; Coal gas supercharger 23; As required, can one or more groups coal gas homogeneous supercharging system be set parallel connection.
With pressure store is that the thermal value that the blast furnace gas cabinet 1 of 5～10kPa is collected is 3000～4000kJ/Nm
3Blast furnace gas 15, pressure store is that the thermal value that the coke-oven gas cabinet 2 of 5～10kPa is collected is 15000～40000kJ/Nm
3Coke-oven gas 16, the about 5000～10000kJ/Nm of thermal value that converter gas cabinet 3 that pressure store is 2～5kPa is collected
3Coal gas of converter 17, be delivered directly to clean burn/mix respectively and burn gas station boiler 5 or/and Industrial Boiler 7 burnings; Or be adjusted to thermal value at 3000～40000kJ/Nm through coal gas allotment supercharging system 4
3Between, pressure is transported to clean burn/mix after between 2～30kPa respectively and burns gas station boiler 5 or/and Industrial Boiler 7, the control gas pressure burns between 2～30kPa.Concrete allotment boosting method is:
(1) burns gas station boiler 5 or/and Industrial Boiler 7 when needing blast furnace gas 15 when clean burn/mix; Open coal gas explosion reverse checkvalve 19A and 19B on the blast furnace gas pipeline; Close the coal gas explosion reverse checkvalve 19C on the blast furnace gas small transfer line, close coal gas explosion reverse checkvalve 19D and the coal gas explosion reverse checkvalve 19G on the coal gas main pipe line on the coke-oven gas main pipe line simultaneously; When clean burn/mix burns gas station boiler 5 or/and Industrial Boiler 7 when needing coke-oven gas 16 or coal gas of converter 17, concocting method is similar;
(2) burn gas station boiler 5 or/and Industrial Boiler 7 when needing the mixed gas of blast furnace gas 15 and coke-oven gas 16 when clean burn/mix; Close the coal gas explosion reverse checkvalve 19B on the blast furnace gas pipeline earlier; Close the coal gas explosion reverse checkvalve 19E on the coke oven gas pipe; Close coal gas explosion reverse checkvalve 19G and the coal gas explosion reverse checkvalve 19K on the coal gas of converter small transfer line on the coal gas of converter main pipe line simultaneously; Open coal gas explosion reverse checkvalve 19A and 19C on the blast furnace gas pipeline again, open coal gas explosion reverse checkvalve 19D and 19F on the coke oven gas pipe; When clean burn/mix burns gas station boiler 5 or/and Industrial Boiler 7 when needing blast furnace gas 15 and coal gas of converter 17 or coke-oven gas 16 with coal gas of converter 17, concocting method is similar;
(3) burn gas station boiler 5 or/and Industrial Boiler 7 when needing the mixed gas of blast furnace gas 15, coke-oven gas 16,17 3 kinds of coal gas of coal gas of converter when clean burn/mix; Close the coal gas explosion reverse checkvalve 19B on the blast furnace gas pipeline earlier; Close the coal gas explosion reverse checkvalve 19E on the coke oven gas pipe; Close the coal gas explosion reverse checkvalve 19H on the converter gas pipeline; Open coal gas explosion reverse checkvalve 19A and 19C on the blast furnace gas pipeline again, open coal gas explosion reverse checkvalve 19D and 19F on the coke oven gas pipe, open coal gas explosion reverse checkvalve 19G and 19K on the converter gas pipeline;
(4) when can not satisfying clean burn/mix, the pressure of coal gas of converter 17 burns gas station boiler 5 or/and the pressure of Industrial Boiler 7 when requiring; Can open coal gas explosion reverse checkvalve 19G and 19K on the converter gas pipeline; Close coal gas explosion reverse checkvalve 19H; Close 19C and 19F simultaneously, through being transported to clean burn/mix the station boiler 5 that burns gas after coal gas supercharger 23 pressurization or/and Industrial Boiler 7; Burn gas station boiler 5 or/and the pressure of Industrial Boiler 7 when requiring when the pressure of blast furnace gas 15 or coke-oven gas 16 can not satisfy clean burn/mix, and concocting method is similar.
Another key character of the present invention is that the complementary energy waste heat of iron and steel enterprise is reclaimed through complementary energy waste-heat recovery device 9, produce low LP steam 13 with in, LP steam 14; The absolute pressure of the low LP steam of Iron And Steel Plant is generally between 0.02MPa～0.05MPa; 60 ℃～70 ℃ of temperature; Mainly from various cogenerations; Like sintering waste heat generating, the generating of converter low-temperature saturated steam, dry coke quenching cogeneration (english abbreviation is CDQ), blast furnace flush slag waste heat, and power generating by remain energy, coal gas-steam combined cycle power generating (english abbreviation is CCPP), clean burn/the mix terminal weary steam of turbine of the boiler generating that burns gas; Generally between 0.8MPa～3.8MPa, the gauge pressure of LP steam is generally between 0.2MPa～0.6MPa for the gauge pressure of Iron And Steel Plant's MP steam; With low LP steam 13 with from the low-quality steam of the terminal low-temp low-pressure that extracts of steam turbine separately or both under steam absolute pressure 0.02MPa～0.04MPa, the heating thermal source is provided after mixing for MED device 12; Produce and desalinize seawater; This method is called MED pattern (English MED running model, multi-effect distilling pattern), during with this mode operation; The TVC device does not move, and MED device the 1st is imitated and adopted low LP steam; Steam between gauge pressure 0.2MPa～3.8MPa that Industrial Boiler 7 is produced with in, LP steam 14 all is transported in the steam pipe system 8; Through reducing-and-cooling plant 10 pressure and temperature reducings reach between gauge pressure 0.20MPa～0.60MPa that TVC device 11 needs, after the qualification of temperature≤250 ℃; Unite to produce by TVC device 11 and MED device 12 and desalinize seawater; This method is called TVC pattern (English MED-TVC running model; Multi-effect distilling thermo compression pattern), during with this mode operation, imitate getting into MED device the 1st after the secondary steam compression again through the TVC device; Perhaps above two kinds of methods are used simultaneously; Be called the MED+TVC pattern, during with this mode operation, imitate getting into the 1st after the secondary steam compression again through the TVC device; During with this mode operation; TVC device and MED device all have only sub-load work, get into MED device the 1st again after the TVC device compresses secondary steam and imitate, and some low LP steam enters into MED device the 1st effect simultaneously.Concrete grammar is:
(1), during and steam absolute pressure 0.02MPa～0.04MPa, adopt the MED pattern to carry out sea water desaltination when the low-quality steam that has only the terminal low-temp low-pressure that extracts of low LP steam 13 and/or steam turbine;
(2) when have only between 0.3MPa～3.8MPa in, during steam between gauge pressure 0.2MPa～3.8MPa of producing of LP steam 14 and/or Industrial Boiler 7; Between gauge pressure 0.20MPa～0.60MPa, behind temperature≤250 ℃, adopt the TVC pattern to carry out sea water desaltination through reducing-and-cooling plant 10 pressure and temperature reducings;
(3) when the low-quality steam of the terminal low-temp low-pressure that extracts of existing low LP steam 13 and/or steam turbine; And steam absolute pressure 0.02MPa～0.04MPa; Have again between 0.3MPa～3.8MPa in, the steam between gauge pressure 0.2MPa～3.8MPa of producing of LP steam 14 and/or Industrial Boiler 7; And through reducing-and-cooling plant 10 pressure and temperature reducings between gauge pressure 0.20MPa～0.60MPa, during temperature≤250 ℃, adopt the MED+TVC pattern to carry out sea water desaltination.
The present invention has the technological improvement of 2 innovations: the one, improved the utilising efficiency of coal gas, and adopt coal gas allotment supercharging system to strengthen the coal gas homogeneity and realize this effect with steady pressure, the zero release of assurance coal gas; The 2nd, adopt steam classification utilization, guarantee that MED is to the efficient utilization of steam and the zero release of steam.
Advantage of the present invention and positively effect are:
1. can improve the regulating power of gas chamber, the coal gas of gas chamber sh is in time consumed through the MED device coal gas;
2. the MED device can effectively utilize low LP steam, has effectively utilized the low temperature and low pressure steam of Iron And Steel Plant.The present invention has important practical and is worth coastal iron and steel enterprise enforcement coal gas, steam zero release.
Description of drawings
Fig. 1 is the system diagram that utilizes low-temperature multiple-effect seawater desalination (english abbreviation is MED) to realize Iron And Steel Plant's coal gas, steam zero release of the present invention.Wherein, blast furnace gas cabinet 1, coke-oven gas cabinet 2, converter gas cabinet 3, coal gas allotment supercharging system 4, clean burn/the mix station boiler 5 that burns gas, steam turbine 6, Industrial Boiler 7, steam pipe system 8, complementary energy waste-heat recovery device 9, reducing-and-cooling plant 10, TVC steam heat compression set 11, MED device 12, low LP steam 13, in, LP steam 14.
Fig. 2 is the process flow sheet of coal gas allotment supercharging system.Wherein, blast furnace gas 15, coke-oven gas 16, coal gas of converter 17, condensed water 18, coal gas explosion reverse checkvalve 19, coal gas homogeneous jar 20, gas relief valve 21, water discharging valve 22, coal gas supercharger 23.Wherein every group of coal gas homogeneous supercharging system comprises the coal gas explosion reverse checkvalve 19C on small transfer line between coal gas explosion reverse checkvalve 19A on the blast furnace gas main pipe line and the coal gas explosion reverse checkvalve 19B; Coal gas explosion reverse checkvalve 19F on small transfer line between coal gas explosion reverse checkvalve 19D on the coke-oven gas main pipe line and the coal gas explosion reverse checkvalve 19E; Coal gas explosion reverse checkvalve 19K on small transfer line between coal gas explosion reverse checkvalve 19G on the coal gas of converter main pipe line and the coal gas explosion reverse checkvalve 19H; Coal gas homogeneous jar 20; Gas relief valve 21; Water discharging valve 22; Coal gas supercharger 23; As required, can be set up in parallel one or more groups coal gas homogeneous supercharging system.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Referring to accompanying drawing 1, certain Iron And Steel Company is the about 3145kJ/Nm of thermal value that the blast furnace gas cabinet 1 of 10kPa is collected with pressure store
3Blast furnace gas 15, pressure store is the about 17900kJ/Nm of thermal value that the coke-oven gas cabinet 2 of 7kPa is collected
3Coke-oven gas 16, pressure store is the about 7536kJ/Nm of thermal value that the converter gas cabinet 3 of 2.6～3.2kPa is collected
3Coal gas of converter 17; Be delivered directly to clean burn/mix burn gas station boiler 5 and 7 burnings of 2 * 35t/h Industrial Boiler respectively; Wherein clean burn/mix the station boiler 5 that burns gas is 2 overcritical station boilers of 300MW, nominal steam pressure 10MPa, configuration extraction condensing type steam turbine 6; Or through coal gas allotment supercharging system 4, parallel connection is provided with 2 groups of separate coal gas homogeneous supercharging systems, is adjusted to thermal value at 8000～10000kJ/Nm
3Between, be transported to clean burn/mix burn gas station boiler 5 and Industrial Boiler 7 burnings behind pressure 3～10kPa respectively, produce steam.Concrete allotment boosting method is:
(1) burns gas station boiler 5 or/and Industrial Boiler 7 when needing blast furnace gas 15 when clean burn/mix; Open coal gas explosion reverse checkvalve 19A and 19B on the blast furnace gas pipeline; Close the coal gas explosion reverse checkvalve 19C on the blast furnace gas small transfer line, close coal gas explosion reverse checkvalve 19D and the coal gas explosion reverse checkvalve 19G on the coal gas main pipe line on the coke-oven gas main pipe line simultaneously; When clean burn/mix burns gas station boiler 5 or/and Industrial Boiler 7 when needing coke-oven gas 16 or coal gas of converter 17, concocting method is similar;
(2) burn gas station boiler 5 or/and Industrial Boiler 7 when needing the mixed gas of blast furnace gas 15 and coke-oven gas 16 when clean burn/mix; Close the coal gas explosion reverse checkvalve 19B on the blast furnace gas pipeline earlier; Close the coal gas explosion reverse checkvalve 19E on the coke oven gas pipe; Close coal gas explosion reverse checkvalve 19G and the coal gas explosion reverse checkvalve 19K on the coal gas of converter small transfer line on the coal gas of converter main pipe line simultaneously; Open coal gas explosion reverse checkvalve 19A and 19C on the blast furnace gas pipeline again, open coal gas explosion reverse checkvalve 19D and 19F on the coke oven gas pipe; When clean burn/mix burns gas station boiler 5 or/and Industrial Boiler 7 when needing blast furnace gas 15 and coal gas of converter 17 or coke-oven gas 16 with coal gas of converter 17, concocting method is similar;
(3) burn gas station boiler 5 or/and Industrial Boiler 7 when needing the mixed gas of blast furnace gas 15, coke-oven gas 16,17 3 kinds of coal gas of coal gas of converter when clean burn/mix; Close the coal gas explosion reverse checkvalve 19B on the blast furnace gas pipeline earlier; Close the coal gas explosion reverse checkvalve 19E on the coke oven gas pipe; Close the coal gas explosion reverse checkvalve 19H on the converter gas pipeline; Open coal gas explosion reverse checkvalve 19A and 19C on the blast furnace gas pipeline again, open coal gas explosion reverse checkvalve 19D and 19F on the coke oven gas pipe, open coal gas explosion reverse checkvalve 19G and 19K on the converter gas pipeline;
(4) when can not satisfying clean burn/mix, the pressure of coal gas of converter 17 burns gas station boiler 5 or/and the pressure of Industrial Boiler 7 when requiring; Can open coal gas explosion reverse checkvalve 19G and 19K on the converter gas pipeline; Close coal gas explosion reverse checkvalve 19H; Close 19C and 19F simultaneously, through being transported to clean burn/mix the station boiler 5 that burns gas after coal gas supercharger 23 pressurization or/and Industrial Boiler 7; Burn gas station boiler 5 or/and the pressure of Industrial Boiler 7 when requiring when the pressure of blast furnace gas 15 or coke-oven gas 16 can not satisfy clean burn/mix, and concocting method is similar.
The various complementary energy cogenerations of this iron and steel enterprise, the waste heat like sintering waste heat, blast-furnace top gas recovery (english abbreviation is TRT), the generating of converter low-temperature saturated steam, blast furnace flush slag reclaims through complementary energy waste-heat recovery device 9.As: 1. in order to reclaim the sintering circular-cooler fume afterheat, every supporting 1 hot tube heat exchanger formula waste heat boiler waste heat boiler of sinter machine, wherein the 1.0MPa saturation steam is about 40t/h, and the 0.3MPa saturation steam is 9t/h; 2. in order to reclaim the converter gas waste heat, every block converter supporting 1 overlaps converter vaporization cooling infrastructure, and recovered steam is pressed the design of 80kg/t steel, recovered steam 3.0MPa～3.6MPa; 3. the supporting walking beam heating furnace of hot rolling line adopts vaporization cooling, recyclable 1.27MPa saturation steam; 4. configuration low pressure waste heat boiler on the flue of cold rolled annealed unit can produce LP steam; 5. blast furnace slag quenching water obtains low LP steam recovery after flash distillation; Produce absolute pressure between 0.02MPa～0.05MPa; Low LP steam that temperature is 60 ℃～70 ℃ 13 with in, LP steam 14; Wherein the gauge pressure of MP steam is between 0.8MPa～3.8MPa, and the gauge pressure of LP steam is between 0.2MPa～0.6MPa.
With low LP steam 13 with from the low-quality steam of the terminal low-temp low-pressure that extracts of steam turbine separately or both mix the back and under absolute pressure 0.02MPa～0.04MPa, can be MED device 12 the heating thermal source is provided, employing MED pattern is produced and is desalinized seawater; With steam between the gauge pressure 0.2MPa～3.8MPa of Industrial Boiler 7 generations; With in, LP steam 14 all is transported in the steam pipe system 8; Through reducing-and-cooling plant 10 pressure and temperature reducings reach between gauge pressure 0.20MPa～0.60MPa that TVC device 11 needs, after the qualification of temperature≤250 ℃; Can adopt the TVC pattern, unite to produce by TVC device 11 and MED device 12 and desalinize seawater; Also can above two kinds of methods be used simultaneously, adopt the MED+TVC pattern to produce and desalinize seawater.Concrete grammar is:
(1), during and steam absolute pressure 0.02MPa～0.04MPa, adopt the MED pattern to carry out sea water desaltination when the low-quality steam that has only the terminal low-temp low-pressure that extracts of low LP steam 13 and/or steam turbine;
(2) when have only between 0.3MPa～3.8MPa in, during steam between the gauge pressure 0.80MPa that produces of LP steam 14 and/or Industrial Boiler 7; Between gauge pressure 0.20MPa～0.60MPa, behind temperature≤250 ℃, adopt the TVC pattern to carry out sea water desaltination through reducing-and-cooling plant 10 pressure and temperature reducings;
(3) when the low-quality steam of the terminal low-temp low-pressure that extracts of existing low LP steam 13 and/or steam turbine; And steam absolute pressure 0.02MPa～0.04MPa; Have again between 0.3MPa～3.8MPa in, the steam between gauge pressure 0.2MPa～3.8MPa of producing of LP steam 14 and/or Industrial Boiler 7; And through reducing-and-cooling plant 10 pressure and temperature reducings between gauge pressure 0.20MPa～0.60MPa, during temperature≤250 ℃, adopt the MED+TVC pattern to carry out sea water desaltination.
Claims (5)
1. utilize sea water desaltination to realize the system of Iron And Steel Plant's coal gas, steam zero release; It is characterized in that, this system comprises blast furnace gas cabinet (1), coke-oven gas cabinet (2), converter gas cabinet (3), coal gas allotment supercharging system (4), clean burn/mix the station boiler that burns gas (5), steam turbine (6), Industrial Boiler (7), steam pipe system (8), complementary energy waste-heat recovery device (9), reducing-and-cooling plant (10), TVC (steam heat compression) device (11), MED (low-temperature multiple-effect seawater desalination) device (12), hangs down LP steam (13), in, LP steam (14); Wherein, Blast furnace gas cabinet (1), coke-oven gas cabinet (2), converter gas cabinet (3) are connected through gas line with coal gas allotment supercharging system (4) respectively, coal gas allotment supercharging system (4) respectively with clean burn/mix the station boiler that burns gas (5) to be connected with Industrial Boiler (7); Clean burn/the mix station boiler that burns gas (5), sucking condensing turbine group (6), Industrial Boiler (7), steam pipe system (8), complementary energy waste-heat recovery device (9), reducing-and-cooling plant (10), TVC device (11), MED device connect through steam-pipe between (12) accordingly; Wherein MED device (12) extracts the low LP steam (13) in the steam turbine (6), when utilizing LP steam (13) to desalinize seawater, plays the effect that substitutes the steam turbine condensing surface; The low LP steam (13) that complementary energy waste-heat recovery device (9) produces is transported to MED device (12) through steam-pipe; Complementary energy waste-heat recovery device (9) produce in, LP steam (14) is transported in the steam pipe system (8) through steam-pipe; Get into TVC device (11) through reducing-and-cooling plant then, unite with MED device (12) and carry out sea water desaltination.
2. system according to claim 1; It is characterized in that; Described coal gas allotment supercharging system (4) comprises blast furnace gas (15), coke-oven gas (16), coal gas of converter (17), condensed water (18), coal gas explosion reverse checkvalve (19), coal gas homogeneous jar (20), gas relief valve (21), water discharging valve (22), coal gas booster fan (23), and wherein every group of coal gas homogeneous supercharging system comprises the coal gas explosion reverse checkvalve (19C) on the small transfer line between the coal gas explosion reverse checkvalve (19A) that is positioned on the blast furnace gas main pipe line and the coal gas explosion reverse checkvalve (19B), is positioned at the coal gas explosion reverse checkvalve (19F) on the small transfer line between coal gas explosion reverse checkvalve (19D) and the coal gas explosion reverse checkvalve (19E) on the coke-oven gas main pipe line, is positioned at coal gas explosion reverse checkvalve (19K), coal gas homogeneous jar (20), gas relief valve (21), water discharging valve (22), coal gas supercharger (23) on the small transfer line between coal gas explosion reverse checkvalve (19G) and the coal gas explosion reverse checkvalve (19H) on the coal gas of converter main pipe line; Can one or more groups coal gas homogeneous supercharging system be set parallel connection.
3. utilize sea water desaltination to realize the technology of Iron And Steel Plant's coal gas, steam zero release; It is characterized in that the blast furnace gas (15) that blast furnace gas cabinet (1) is collected, the coke-oven gas (16) that coke-oven gas cabinet (2) is collected, the coal gas of converter (17) that converter gas cabinet (3) is collected are delivered directly to clean burn/mix the station boiler that burns gas (5) or/and Industrial Boiler (7) burning respectively; Or be adjusted to thermal value at 3000～40000kJ/Nm through coal gas allotment supercharging system (4)
3Between, pressure is transported to clean burn/mix the station boiler that burns gas (5) after between 2～30kPa respectively or/and Industrial Boiler (7) burning, concrete allotment boosting method is:
(1) when clean burn/mix the station boiler that burns gas (5) or/and Industrial Boiler (7) when needing blast furnace gas (15); Open the coal gas explosion reverse checkvalve (19A) and (19B) on the blast furnace gas pipeline; Close the coal gas explosion reverse checkvalve (19C) on the blast furnace gas small transfer line, close coal gas explosion reverse checkvalve (19D) and the coal gas explosion reverse checkvalve (19G) on the coal gas main pipe line on the coke-oven gas main pipe line simultaneously; Or/and Industrial Boiler (7) when needing coke-oven gas (16) or coal gas of converter (17), concocting method is similar when clean burn/mix the station boiler that burns gas (5);
(2) when clean burn/mix the station boiler that burns gas (5) or/and Industrial Boiler (7) when needing the mixed gas of blast furnace gas (15) and coke-oven gas (16); Close the coal gas explosion reverse checkvalve (19B) on the blast furnace gas pipeline earlier; Close the coal gas explosion reverse checkvalve (19E) on the coke oven gas pipe; Close coal gas explosion reverse checkvalve (19G) and the coal gas explosion reverse checkvalve (19K) on the coal gas of converter small transfer line on the coal gas of converter main pipe line simultaneously; Open the coal gas explosion reverse checkvalve (19A) and (19C) on the blast furnace gas pipeline again, open the coal gas explosion reverse checkvalve (19D) and (19F) on the coke oven gas pipe; Or/and Industrial Boiler (7) when needing blast furnace gas (15) and coal gas of converter (17) or coke-oven gas (16) and coal gas of converter (17), concocting method is similar when clean burn/mix the station boiler that burns gas (5);
(3) when clean burn/mix the station boiler that burns gas (5) or/and Industrial Boiler (7) when needing the mixed gas of blast furnace gas (15), coke-oven gas (16), (17) three kinds of coal gas of coal gas of converter; Close the coal gas explosion reverse checkvalve (19B) on the blast furnace gas pipeline earlier; Close the coal gas explosion reverse checkvalve (19E) on the coke oven gas pipe; Close the coal gas explosion reverse checkvalve (19H) on the converter gas pipeline; Open the coal gas explosion reverse checkvalve (19A) and (19C) on the blast furnace gas pipeline again, open the coal gas explosion reverse checkvalve (19D) and (19F) on the coke oven gas pipe, open the coal gas explosion reverse checkvalve (19G) and (19K) on the converter gas pipeline;
(4) can not satisfy clean burn/mix the station boiler that burns gas (5) or/and the pressure of Industrial Boiler (7) when requiring when the pressure of coal gas of converter (17); Can open the coal gas explosion reverse checkvalve (19G) and (19K) on the converter gas pipeline; Close coal gas explosion reverse checkvalve (19H); Close simultaneously (19C) and (19F), through being transported to clean burn/mix the station boiler that burns gas (5) after coal gas supercharger (23) pressurization or/and Industrial Boiler (7); When the pressure of blast furnace gas (15) or coke-oven gas (16) can not satisfy clean burn/mix the station boiler that burns gas (5) or/and the pressure of Industrial Boiler (7) when requiring, concocting method is similar.
4. technology according to claim 3 is characterized in that, the pressure store of blast furnace gas cabinet (1) is 5～10kPa, and the blast furnace gas of collecting (15) thermal value is 3000～4000kJ/Nm
3Coke-oven gas cabinet (2) pressure store is 5～10kPa, and the coke-oven gas of collecting (16) thermal value is 15000～40000kJ/Nm
3Converter gas cabinet (3) pressure store is 2～5kPa, and the coal gas of converter of collecting (17) thermal value is 5000～10000kJ/Nm
3Clean burn/mix the station boiler that burns gas (5) or Industrial Boiler (7) requires gas pressure between 2～30kPa.
5. technology according to claim 3; It is characterized in that; The complementary energy waste heat of iron and steel enterprise is reclaimed through complementary energy waste-heat recovery device (9), produce low LP steam (13) with in, LP steam (14), will hang down LP steam (13) with independent from the low-quality steam of the terminal low-temp low-pressure that extracts of steam turbine or both under steam absolute pressure 0.02MPa～0.04MPa, the heating thermal source is provided after mixing for MED device (12); Produce and desalinize seawater, this method is called the MED pattern; The gauge pressure that Industrial Boiler (7) is produced be between 0.2MPa～3.8MPa steam with in, LP steam (14) all is transported in the steam pipe system (8); Through reducing-and-cooling plant (10) pressure and temperature reducing reach between gauge pressure 0.20MPa～0.60MPa that TVC device (11) needs, after the qualification of temperature≤250 ℃; United to produce by TVC device (11) and MED device (12) and desalinize seawater, this method is called the TVC pattern; Perhaps above two kinds of methods are used simultaneously, be called the MED+TVC pattern; Concrete grammar is:
(1), during and steam absolute pressure 0.02MPa～0.04MPa, adopt the MED pattern to carry out sea water desaltination when the low-quality steam that has only the terminal low-temp low-pressure that extracts of low LP steam 13 and/or steam turbine;
(2) when have only between 0.3MPa～1.3MPa in, when the gauge pressure that produces of LP steam 14 and/or Industrial Boiler 7 is the steam between 0.2MPa～3.8MPa; Between gauge pressure 0.20MPa～0.60MPa, behind temperature≤250 ℃, adopt the TVC pattern to carry out sea water desaltination through reducing-and-cooling plant (10) pressure and temperature reducing;
(3) when the low-quality steam of the terminal low-temp low-pressure that extracts of existing low LP steam (13) and/or steam turbine; And steam absolute pressure 0.02MPa～0.04MPa; Have again between 0.3MPa～3.8MPa in, the steam between gauge pressure 0.2MPa～3.8MPa of producing of LP steam (14) and/or Industrial Boiler (7) and through reducing-and-cooling plant (10) pressure and temperature reducing between gauge pressure 0.20MPa～0.60MPa, during temperature≤250 ℃, adopt the MED+TVC pattern to carry out sea water desaltination.
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