CN102557318A - Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing - Google Patents
Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing Download PDFInfo
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- CN102557318A CN102557318A CN2012100088776A CN201210008877A CN102557318A CN 102557318 A CN102557318 A CN 102557318A CN 2012100088776 A CN2012100088776 A CN 2012100088776A CN 201210008877 A CN201210008877 A CN 201210008877A CN 102557318 A CN102557318 A CN 102557318A
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- water
- flushing
- pipe
- slag
- cinder
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a method and a system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing. In the method, slag at high temperature of 1,500DEG C is subjected to water quenching, slag-washing water instantaneously absorbs a great deal of latent heat of vaporization, and is evaporated to form slag-washing spent steam which contains low salt content and is rich in the latent heat of vaporization; the spent steam is subjected to condensation heat transfer to prepare the soft water or demineralized water, and low-grade latent heat of vaporization is brought to terminal users such as boilers and the like through the soft water or the demineralized water; meanwhile, the spent steam is purified to reduce dust pollution. The system for implementing the method comprises a water quenching circular slag-washing device, a spent steam purifier and a water making device. The invention has the advantages that: the spent steam is prepared into the soft water or the demineralized water at low cost and light pollution, the afterheat of the spent steam is recovered, the emission of slag-washing dust and the visual pollution of the spent steam are greatly reduced, and the comprehensive benefit is obvious.
Description
Technical field
The invention belongs to the UTILIZATION OF VESIDUAL HEAT IN technical field, be specifically related to a kind of iron-smelting blast furnace flushing cinder waste vapour UTILIZATION OF VESIDUAL HEAT IN method and system.
Background technology
In Iron And Steel Industry was produced, iron-smelting blast furnace will be discharged a large amount of 1500 ℃ of left and right sides high-temperature slags, contains a large amount of high temperature sensible heats simultaneously, under the impact of 6 ~ 8 times of water, is granulated into grain slag.Water is heated, and produces a large amount of low-temp low-pressure waste vapour, and carry a certain amount of dust secretly and enter in the air, pollutant atmosphere, its water smoke also forms visual pollution.Waste vapour in uphill process, constantly be condensed into water droplet be scattered near on the equipment, pipeline, dust of carrying secretly and dissolved sour gas can cause surrounding devices, Corrosion of Pipeline and stained again.Hot water circulation behind the flushing cinder is used, and its temperature can reach more than 95 ℃.At present, for the blast furnace slag flushing waste heat, people mainly reclaim through modes such as hot water for slag flushing heating, and because of heating season property is strong, reasons such as high, the easy fouling of hot water hardness are difficult to promote, and cause a large amount of waste heats, dust and steam still to enter atmosphere around the clock.
The reason that past high-temperature slag shrend UTILIZATION OF VESIDUAL HEAT IN is failed time and again, except ignoring the harm of flushing cinder water hardness, prior reason is to think that by error waste heat is in water; Just the opposite, no matter adopt the water of many low temperatures to come flushing cinder, in contacting with the moment of high-temperature slag; The capital produces a large amount of steam, and takes away most of heat, has only a spot of heat to get in the water; Circulation flushing cinder water temp is improved constantly, near 100 ℃.Not only interchanger and pipeline scale are very fast with the heating of flushing cinder water cycle the time, and water temperature also descends very soon, causes the heating effect bad.
Summary of the invention
The present invention aims to provide the method and system that a kind of iron-smelting blast furnace flushing cinder waste vapour prepares soft water and utilizes waste heat, to realize preparation high-quality soft water, to improve the purpose that the blast furnace slag flushing utilization rate of waste heat reduces dust pollution simultaneously.
The objective of the invention is to be achieved through following technical scheme.
A kind of iron-smelting blast furnace flushing cinder of the present invention waste vapour prepares soft water and utilizes the method for waste heat, and when promptly being based on 1500 ℃ of high-temperature slags of shrend, the flushing cinder instant water absorbs a large amount of latent heats of vaporization, and it is low and be rich in the flushing cinder waste vapour of a large amount of latent heats of vaporization that evaporation forms saltiness; This waste gas condensing heat-exchange is prepared soft water or de-mineralized water and brings the low-quality latent heat of vaporization terminal users such as into boiler through soft water or de-mineralized water; Carrying out waste vapour simultaneously purifies to reduce dust pollution.
A kind of iron-smelting blast furnace flushing cinder of the present invention waste vapour prepares soft water and utilizes the system of waste heat, comprises shrend circulation slag flushing device, waste vapour refining plant and water generator; Said shrend circulation slag flushing device is made up of flushing cinder water circulation tank, flushing cinder water-circulating pump, high-temperature slag ditch, cinder-flushing groove, rotary screen, rotating screen guard and the belt of slagging tap; Said high-temperature slag ditch is located at cinder-flushing groove import top; Said cinder-flushing groove stretches into rotary screen inside; The said belt of slagging tap picks out from rotary screen inside, and said rotary screen cover cap is lived rotary screen, and said flushing cinder water circulation tank is located at the rotary screen below; And link to each other with the flushing cinder water-circulating pump by water absorption tube, be connected under the outlet of high-temperature slag ditch from the rising pipe of flushing cinder water-circulating pump; Said waste vapour refining plant is made up of gas skirt, catalytic converter and bleed valve; Said vapour collect cover covers the cinder-flushing groove in the above-mentioned shrend circulation slag flushing device; With effuser gas skirt is linked to each other with catalytic converter, said bleed valve links to each other with rotary screen in the above-mentioned shrend circulation slag flushing device; Said water generator is made up of condensing heat exchanger, thermal deaerator, finished product water pipe, condensate pump, polisher, MSF device, new water pipe and non-condensable gas pipe; Said condensing heat exchanger leading portion connects that polisher rising pipe, its back segment prolong link to each other with the MSF device, its top and the non-condensable gas pipe joins, its underpart condensate pipe and condensate pump join; The top steam outlet pipe of the catalytic converter in said condensing heat exchanger and the above-mentioned waste vapour refining plant links to each other; Said MSF device water-in connects new water pipe, its rising pipe and condensing heat exchanger joins, take back the MSF device after the indirect heating again, its condensate pipe also joins with condensate pump, its underpart concentrates water pipe and inserts the flushing cinder water circulation tank in the above-mentioned shrend circulation slag flushing device; Said condensate pump rising pipe and polisher import are joined; Said polisher water outlet gets in the thermal deaerator through aforementioned condensing heat exchanger heats deoxygenation, and said thermal deaerator connects the finished product water pipe.
As a kind of optimization, in connecting the waste vapour refining plant, on the dry pipe of gas skirt and catalytic converter the accident aiutage is set.
Technique effect of the present invention is: overcome to have now and directly utilized the using exhaust heat of slag flushing water method to be prone to fouling, recovery utilization rate is low, can not solve defectives such as waste vapour dust polluting environment problem.With exhaust steam system soft water and recovery waste heat, not only annual a large amount of waste heats and the water of condensation of reclaiming; And in precision processing such as soft water, de-mineralized water, prolong the cycle of operation of yin, yang ion-exchanger greatly, and improve effluent quality, reduce reagent consumption such as regeneration soda acid and regenerative wastewater amount more than 90%; A large amount of simultaneously dust discharge and visual pollutions of reducing, comprehensive benefit is remarkable.
Description of drawings
Fig. 1 is the synoptic diagram of system of the present invention.
Shown in the figure: 1. flushing cinder water circulation tank, 2. flushing cinder water-circulating pump, 3. high-temperature slag ditch, 4. cinder-flushing groove, 5. vapour collect cover; 6. rotary screen, 7. rotating screen guard, 8. cleaner, 9. bleed valve, the belt of 10. slagging tap; 11. condensing heat exchanger, 12. thermal deaerators, 13. finished product water pipes, 14. condensate pumps, 15. polisher; 16. the MSF device, 17. new water pipes, 18. non-condensable gas pipes, 19. emergency dump steam tubes.
Embodiment
Below in conjunction with detailed description of the drawings the present invention.
As shown in Figure 1, a kind of iron-smelting blast furnace flushing cinder of the present invention waste vapour prepares soft water and utilizes the system of waste heat, is made up of shrend circulation slag flushing device, waste vapour refining plant and water generator three parts, and each several part primary structure and function introduction are following:
First part: shrend circulation slag flushing device
High-temperature slag ditch 3 is located at cinder-flushing groove 4 imports tops, is connected under 3 outlets of high-temperature slag ditch from the rising pipe of flushing cinder water-circulating pump 2, and the high-temperature slag of discharge is broken up by the high velocity jet of below, the cool quickly granulation, and pulp water falls into cinder-flushing groove 4 together; Cinder-flushing groove 4 stretches into rotary screen 6 inside, and pulp water is imported rotary screen 6 together; The belt 10 of slagging tap picks out from rotary screen 6 inside, derives grain slag; Rotating screen guard 7 covers rotary screen 6, with the duct waste vapour that produces in the filtration procedure is introduced vapour collect cover 5, in order to avoid the waste vapour diffusion; Vapour collect cover 5 covers cinder-flushing groove 4, links to each other with catalytic converter 8 with dry pipe, waste vapour is collected the back import cleaner 8; Flushing cinder water circulation tank 1 is located at rotary screen 6 belows, and collecting precipitation rotary screen 6 filter back water, and linked to each other with flushing cinder water-circulating pump 2 by water absorption tube are connected under high-temperature slag ditch 3 exports the circulation flushing cinder from the rising pipe of flushing cinder water-circulating pump 2.Necessary insulation is carried out in the pulp water recycle system that liquidates equipment, pipeline and pond, so that reduce calorific loss.
Second section: waste vapour refining plant
Waste vapour refining plant 8 tops link to each other with dry pipe with vapour collect cover 5 tops, and steam outlet pipe links to each other with condensing heat exchanger 11, and the bottom is inserted rotary screen 6 with pipeline through bleed valve 9, and water in the waste vapour and dust separation are come out, and improves the water quality of water of condensation; Establish emergency dump steam tube 19 on the dry pipe, so that waste vapour is diffused during the follow up device fault.
Third part: water generator
Condensing heat exchanger 11 links to each other with waste vapour refining plant 8, and leading portion connects polisher 15 rising pipes, behind condensing heat exchanger 11, links to each other with thermal deaerator 12, removes the dissolved oxygen in the water, and thermal deaerator 12 connects finished product water pipe 13; Condensing heat exchanger 11 back segment prolongs link to each other with MSF device 16, and its top and non-condensable gas pipe 18 join, and its condensate pipe and condensate pump 14 join; MSF device 16 water-ins connect new water pipe 17, and its rising pipe and condensing heat exchanger 11 join, and take back MSF device 16 after the indirect heating again, and its condensate pipe also joins with condensate pump 14, and its underpart concentrates water pipe and inserts flushing cinder water circulation tank 1; Condensate pump 14 rising pipes and polisher 15 imports are joined, and polisher 15 water outlets are through aforementioned condensing heat exchanger 11 heating deoxygenations.Polisher 15 is general according to the demands of different of different user to finished product water quality, correspondingly selects technologies such as system soft water, de-mineralized water.
The present invention also provides a kind of brand-new iron-smelting blast furnace flushing cinder waste vapour to prepare soft water and has utilized the method for waste heat; Form a large amount of water vapors when promptly utilizing flushing cinder; After these exhaust steam collections, deliver to cleaner and isolate the dust and the globule in the steam, deliver to one section of condensing heat exchanger again; Continue heat exchange with the new water that comes with the MSF device after the polisher water outlet heat exchange for two sections at condensing heat exchanger, form one time water of condensation; New water after the heating is got back to the MSF device and is carried out the flash distillation desalination; Form time condensation water; Be pumped to polisher after a water of condensation mixes and process high-quality soft water or de-mineralized water, in one section heating of condensing heat exchanger, supply the user by band heat after the thermal deaerator deoxygenation is outer again; Flushing cinder water advances rotary screen with the isolated pulp water of cleaner to carry out pulp water and separates, and granulated slag is sent outside by belt, and filter back water continues the circulation flushing cinder.
Practical implementation step of the present invention is following:
(1) blast furnace slag drains into cinder-flushing groove 4 through high-temperature slag ditch 3, and under the impact of 6～8 times of flushing cinder water, shrend becomes fine particle rapidly; Water mixes the horizontal column rotary screen 6 of inflow with slag; Elimination flushing cinder water, grain slag rise to earlier and send outside after belt 10 tops of slagging tap freely fall into the belt 10 of slagging tap under the effect of rotary screen; Flushing cinder water under the filter is got back to flushing cinder water circulation tank 1, and post precipitation continues flushing cinder;
(2) above cinder-flushing groove 4; If the waste vapour collection device is collected the waste vapour that produces in the flushing cinder process, import cleaner 8 dedustings and water smoke then and catch; Waste vapour after the purification gets into carbonated drink condensing heat exchanger 11; Carry out a heat exchange condensation with polisher 15 water outlets, do not have the waste vapour continuation of condensation and the new water after 16 preheatings of MSF device to carry out the secondary heat exchange condensation, remaining non-condensable gas is extracted out and is effluxed; Water-slag mixture that the waste vapour refining plant is discharged directly enters rotary screen 6 through bleed valve 9 and filters, and carries out pulp water and separates;
(3) after 16 heat exchange of the advanced MSF device of new water heat up, advance condensing heat exchanger 11 heating again, and then get back to 16 flash distillations of MSF device and produce water of condensation;
(4) water of condensation that MSF device 16 and condensing heat exchanger 11 is come out pressurizes; Send into polisher 15 and carry out the softening or desalination of the degree of depth; Advance condensing heat exchanger 11 heat temperature raisings then; Advance thermal deaerator 12 deoxygenations again, be incubated finished product of terminal company water users such as delivering to boiler through finished product water pipe 13 at last, the dense water that MSF device 16 produces is as the make up water of flushing cinder recirculated water;
(5) MSF device 16 is extracted discharging with blower fan or vacuum ejector through non-condensable gas pipe 18 with the non-condensable gas that condensing heat exchanger 11 produces.
Innovative point of the present invention is: make soft water or de-mineralized water and recovery waste heat with low-cost low pollution of exhaust steam, and reduce flushing cinder dust discharge and waste vapour visual pollution in a large number, comprehensive benefit is remarkable.System shown in the accompanying drawing is a most preferred embodiment of the present invention, and practical structure is not limited thereto.So,, under the situation that does not break away from the invention aim,, all should belong to protection scope of the present invention without creationary frame mode similar and the embodiment of designing with this technical scheme if those of ordinary skill in the art is enlightened by it.
Claims (3)
1. an iron-smelting blast furnace flushing cinder waste vapour prepares soft water and utilizes the method for waste heat, and it is characterized in that: when being based on 1500 ℃ of high-temperature slags of shrend, the flushing cinder instant water absorbs a large amount of latent heats of vaporization, and it is low and be rich in the flushing cinder waste vapour of a large amount of latent heats of vaporization that evaporation forms saltiness; This waste gas condensing heat-exchange is prepared soft water or de-mineralized water and brings the low-quality latent heat of vaporization terminal users such as into boiler through soft water or de-mineralized water; Carrying out waste vapour simultaneously purifies to reduce dust pollution.
2. a system that realizes the said preparation soft water of claim 1 and utilize the waste heat method comprises shrend circulation slag flushing device, waste vapour refining plant and water generator, it is characterized in that:
Said shrend circulation slag flushing device is made up of flushing cinder water circulation tank [1], flushing cinder water-circulating pump [2], high-temperature slag ditch [3], cinder-flushing groove [4], rotary screen [6], rotating screen guard [7] and the belt of slagging tap [10]; Said high-temperature slag ditch [3] is located at cinder-flushing groove [4] import top; Said cinder-flushing groove [4] stretches into rotary screen [6] inside; The said belt of slagging tap [10] picks out from rotary screen [6] inside, and said rotating screen guard [7] covers rotary screen [6], and said flushing cinder water circulation tank [1] is located at rotary screen [6] below; And link to each other with flushing cinder water-circulating pump [2] by water absorption tube, be connected under high-temperature slag ditch [3] outlet from the rising pipe of flushing cinder water-circulating pump [2];
Said waste vapour refining plant is made up of gas skirt [5], catalytic converter [8] and bleed valve [9]; Said vapour collect cover [5] covers the cinder-flushing groove [4] in the above-mentioned shrend circulation slag flushing device; With effuser gas skirt [5] is linked to each other with catalytic converter [8], said bleed valve [9] links to each other with rotary screen [6] in the above-mentioned shrend circulation slag flushing device;
Said water generator is made up of condensing heat exchanger [11], thermal deaerator [12], finished product water pipe [13], condensate pump [14], polisher [15], MSF device [16], new water pipe [17] and non-condensable gas pipe [18]; Said condensing heat exchanger [11] leading portion connects that polisher [15] rising pipe, its back segment prolong link to each other with MSF device [16], its top and non-condensable gas pipe [18] joins, its underpart condensate pipe and condensate pump [14] join; The top steam outlet pipe of the catalytic converter [8] in said condensing heat exchanger [11] and the above-mentioned waste vapour refining plant links to each other; Said MSF device [16] water-in connects that new water pipe [17], its rising pipe and condensing heat exchanger [11] join, take back that MSF device [16], its condensate pipe also join with condensate pump [14], its underpart concentrates water pipe and inserts the flushing cinder water circulation tank [1] in the above-mentioned shrend circulation slag flushing device after the indirect heating again; Said condensate pump [14] rising pipe and polisher [15] import are joined; Said polisher [15] water outlet gets into heating deoxygenation in the thermal deaerator [12] through aforementioned condensing heat exchanger [11], and said thermal deaerator [12] connects finished product water pipe [13].
3. preparation soft water as claimed in claim 2 also utilizes the system of waste heat, it is characterized in that, in connecting the waste vapour refining plant, on the dry pipe of gas skirt [5] and catalytic converter [8] accident aiutage [19] is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100088776A CN102557318A (en) | 2012-01-13 | 2012-01-13 | Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100088776A CN102557318A (en) | 2012-01-13 | 2012-01-13 | Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030381A (en) * | 2014-06-18 | 2014-09-10 | 西安交通大学 | System and method for preparing steam-injection boiler feed water by utilizing waste heat of ground of oilfield |
| CN104988257A (en) * | 2015-08-03 | 2015-10-21 | 中冶赛迪工程技术股份有限公司 | Blast furnace slag washing water waste heat recovery system |
| CN106906321A (en) * | 2017-05-08 | 2017-06-30 | 安徽工业大学 | A kind of Treating Methods for BF Slag and device that can directly obtain the dry slag of high temperature |
| CN107739763A (en) * | 2017-10-31 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Water quenching carbide slag collects conveying device |
| CN109881738A (en) * | 2019-04-26 | 2019-06-14 | 秦皇岛莱特流体设备制造有限公司 | A kind of washing slag water steam exhaust fog dissipation system and defogging method |
| CN110964866A (en) * | 2019-12-30 | 2020-04-07 | 中冶赛迪上海工程技术有限公司 | Recovery device and recovery method for steam heat and moisture of blast furnace granulated slag |
| CN111928709A (en) * | 2020-07-10 | 2020-11-13 | 广东韶钢松山股份有限公司 | Slag flushing exhaust steam waste heat recovery system and recovery method |
| CN114482927A (en) * | 2021-12-31 | 2022-05-13 | 西安本清化学技术有限公司 | Green low-carbon development system and method for thickened oil |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030381A (en) * | 2014-06-18 | 2014-09-10 | 西安交通大学 | System and method for preparing steam-injection boiler feed water by utilizing waste heat of ground of oilfield |
| CN104030381B (en) * | 2014-06-18 | 2016-04-27 | 西安交通大学 | A kind of system and method utilizing oil field ground waste heat to prepare injection boiler feedwater |
| CN104988257A (en) * | 2015-08-03 | 2015-10-21 | 中冶赛迪工程技术股份有限公司 | Blast furnace slag washing water waste heat recovery system |
| CN106906321A (en) * | 2017-05-08 | 2017-06-30 | 安徽工业大学 | A kind of Treating Methods for BF Slag and device that can directly obtain the dry slag of high temperature |
| CN107739763A (en) * | 2017-10-31 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Water quenching carbide slag collects conveying device |
| CN109881738A (en) * | 2019-04-26 | 2019-06-14 | 秦皇岛莱特流体设备制造有限公司 | A kind of washing slag water steam exhaust fog dissipation system and defogging method |
| CN110964866A (en) * | 2019-12-30 | 2020-04-07 | 中冶赛迪上海工程技术有限公司 | Recovery device and recovery method for steam heat and moisture of blast furnace granulated slag |
| CN110964866B (en) * | 2019-12-30 | 2024-02-06 | 中冶赛迪上海工程技术有限公司 | Recovery device and recovery method for steam heat and moisture of blast furnace slag |
| CN111928709A (en) * | 2020-07-10 | 2020-11-13 | 广东韶钢松山股份有限公司 | Slag flushing exhaust steam waste heat recovery system and recovery method |
| CN114482927A (en) * | 2021-12-31 | 2022-05-13 | 西安本清化学技术有限公司 | Green low-carbon development system and method for thickened oil |
| CN114482927B (en) * | 2021-12-31 | 2024-06-07 | 西安本清化学技术有限公司 | Green low-carbon development system and method for thickened oil |
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Application publication date: 20120711 |