CN103333987B - Converter gas dry method bag-type recovering and purifying process system - Google Patents

Converter gas dry method bag-type recovering and purifying process system Download PDF

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Publication number
CN103333987B
CN103333987B CN201310285499.0A CN201310285499A CN103333987B CN 103333987 B CN103333987 B CN 103333987B CN 201310285499 A CN201310285499 A CN 201310285499A CN 103333987 B CN103333987 B CN 103333987B
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gas
heat boiler
waste heat
cooler
method bag
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CN103333987A (en
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王宇
杨柏松
王佳生
段梦凡
潘家綮
王莉佳
王琼
贾敏
艾晗
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Liaoning Huanyu Environmental Protection Technology Co.,Ltd.
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Liaoning Huanyu Environmental Protection Technique Co Ltd
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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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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Abstract

The invention relates to a converter gas dry method bag-type recovering and purifying process system. A waste heat boiler is connected with a water-cooling flue; the two ends of a primary waste heat boiler are connected with the water-cooling flue and an atomizing cooler respectively; the atomizing cooler is connected to a secondary waste heat boiler through a cinder cooler; the inlet of the secondary waste heat boiler is connected with a gas mixer through a heating valve bank; the secondary waste heat boiler is connected with a by-pass blower and the gas mixer respectively by a three way valve; the gas mixer is connected to a plurality of dry method bag-type dust removers; the dry method bag-type dust removers are connected with a gas blower; the gas blower is connected to a clean gas cooler; the clean gas cooler is connected to a gaspipe network; the clean gas cooler and the gas mixer are connected by a pipeline and the heating valve bank; a low speed valve bank is arranged between the inlet and the outlet of the gas blower; the bottom of the cinder cooler and the bottom of each dry method bag-type dust remover are connected with totally-enclosed cinder conveyers respectively; and the totally-enclosed cinder conveyers are connected with a cinder storage bin. The converter gas dry method bag-type recovering and purifying process system of the invention is capable of controlling the dust concentration of gas under 5mg/Nm<3>.

Description

Converter gas full-dry method pocket type reclaiming clean process system
Technical field
Heat energy in the coal gas of high temperature that the invention produces when being and reclaiming converter smelting for whole process, and coal gas is adopted to the converter gas full-dry method pocket type reclaiming clean process system of full-dry method bag-type dusting.
Background technology
Converter produces a large amount of flue gas containing carbon monoxide in smelting process, and be commonly called as " converter raw coke oven gas ", temperatures as high 1450 DEG C, has larger heat energy, and contain a large amount of dust in coal gas, dust content is up to 100 ~ 120 g/Nm simultaneously 3, dust main component is the oxide of iron and iron, in order to the heat energy in gas recovery and dust, and coal gas is purified utilization, is the normal operation ensureing follow-up equipment, could uses after raw coke oven gas must being carried out dedusting.At present, coal gas of converter mainly adopts wet method (OG method) and semidry method (LT method) two kinds of reclaiming clean techniques.
Wet method (OG method) reclaiming clean technique: be that nippon and Kawasaki company develop jointly the reclaiming clean technology of development the sixties in last century, this technology is primarily of evaporated cooling system, secondary purification system, dewatering system, sewage disposal system, dreg removing system, the composition such as water circulation and cooling system, coal gas is down to 800 ~ 950 DEG C through cooling stack temperature by about 1450 DEG C, enter dust separation system, temperature is down to about 50 DEG C, remove the dust in coal gas, sewage with dust enters settling system through being separated, concentrated, after processed, dust is stand-by after drying, sewage recycles after treatment.Wet method (OG method) reclaiming clean technique one-time investment and floor space is large, operating cost is high, secondary pollution is serious, water consumption is large when running, and need carry out after-treatment to water.Waste water treatmentntrol difficult, particularly heat-energy losses waste is serious, and after purification, dust content of gas is up to 100mg/Nm 3above, the requirement of subsequent production technique can not be met.Before entering gas chamber, increase wet-esp for this reason carry out again smart dedusting, its dust content of gas is controlled at about 10mg/Nm 3, equipment corrosion is serious, and easily blasts.
Semidry method (LT method) is coal gas of converter semidry method (LT method) the reclaiming clean technology that German Lu Qi company and Di Sen steel mill developed jointly at the end of the sixties in last century, system is primarily of devaporizer, cylinder type electric cleaner, gas washing cooler, the compositions such as steam-water separator, coal gas is down to 800 ~ 1000 DEG C by indirect heat exchange temperature by about 1450 DEG C through cooling stack, then enter devaporizer and be down to 180 ~ 200 DEG C by direct heat transfer temperature, reduce the resistivity of coal gas simultaneously, after have collected meal dirt, enter cylinder type electric cleaner, further purification, dust content of gas is down to about 10mg/Nm 3, reach dust removing effects.LT method is not only invested high, and fault is many, operating difficulties, and due to electric precipitation electric discharge, often occur that quick-fried phenomenon is dodged in local, device damage is serious.Same with OG method exist thermal waste problem, and dust content of gas is high, but had very much progress compared with OG method, solves OG method water consumption and secondary pollution problem.Calorific value of gas has had relative raising compared with OG method.Up to the present, the whole world is except minority pneumatic steelmaking adopts LT method, and all the other all adopt OG method.Because LT method and OG method have had significant improvement, people in the industry's most attention and concern.
Summary of the invention
The object of the invention is to provide a kind ofly by the energy recovery in coal gas of converter, and can remove the full-dry method pocket type reclaiming clean process system of (dust content controls at below 5mg/Nm3) by the dust in coal gas.This reclaiming clean process system, thoroughly solves consumption and the secondary pollution problem of wet method (OG method) reclaiming clean fresh water (FW), the quick-fried phenomenon of sudden strain of a muscle produced when simultaneously overcoming the electric discharge of (LT method) electric precipitation; Guaranteeing that under converter and the stable prerequisite of follow-up equipment, whole process has reclaimed the heat energy in coal gas of converter, thus realizes low energy consumption or Non-energy-consumption pneumatic steelmaking.
The object of the invention is realized by following technical scheme: converter gas full-dry method pocket type reclaiming clean process system, is made up of waste heat boiler, water-cooled flue, one-level waste heat boiler, spray cooler, device for cooling ash, secondary waste heat boiler, intensification valve sets, three-way switch valve, bypass blower fan, air and gas mixer, some dry-method bag-type dedusters, gas fan, low cruise valve sets, purified gas cooler, cooling valve sets, explosion venting device, totally-enclosed ash conveying device, ash-storing bin and control system.
Waste heat boiler outlet connects water-cooled flue, water-cooled flue outlet connects one-level waste heat boiler, one-level heat boiler outlet connects spray cooler, spray cooler outlet is connected with secondary exhaust-heat boiler inlet by device for cooling ash, secondary exhaust-heat boiler inlet is connected with air and gas mixer entrance with intensification valve sets by the road, secondary heat boiler outlet is connected with air and gas mixer entrance with bypass blower fan respectively by three-way switch valve, air and gas mixer outlet is connected with the dry-method bag-type deduster of some laid out in parallel, dry-method bag-type house outlet connects gas fan, gas fan outlet connects purified gas cooler, purified gas cooler outlet is connected with gaspipe network, be connected with cooling valve sets by the road between purified gas cooler outlet and air and gas mixer entrance, gas fan entrance end establishes low cruise valve sets, some dry-method bag-type dedusters are connected with explosion venting device, device for cooling ash is connected totally-enclosed ash conveying device respectively with some dry-method bag-type deduster bottoms, totally-enclosed ash conveying device is connected with ash-storing bin by the road.
The advantage of the invention: 1) owing to have employed I and II waste-heat recovery device, has reclaimed heat energy while cooling and thick dedusting; 2) have employed dry-method bag-type deduster in parallel, dust removing effects is remarkable, and the dust content in coal gas of converter can be controlled in below 5mg/Nm3, far away higher than the 80mg/Nm3 of wet method (OG method) reclaiming clean, and the 10mg/Nm3 of semidry method (LT method) reclaiming clean; 3) owing to being provided with totally-enclosed ash conveying device in dry-method bag-type deduster bottom, decrease the secondary pollution to environment, and the dust reclaimed can utilize by secondary; 4) in gas fan outlet, low cruise valve sets is installed, controls the pressure and the flow that enter pipe network, guarantee system even running; 5) before dry-method bag-type deduster, be provided with air and gas mixer, before ensureing that coal gas enters dry-method bag-type deduster, control gas temperature between 150 DEG C ~ 200 DEG C, to guarantee that dry-method bag-type deduster security of operation is stablized; 6) due on waste heat boiler, sack cleaner body and system pipe network place be respectively equipped with explosion venting device, thoroughly solve this technological limits explosion issues.7) device for cooling ash is provided with in I and II waste heat boiler lower end, while high-temperature dust ash can being cooled, by heat energy recycle.8) spray cooler has been set up in the invention, gas temperature can be down to rapidly about 450 DEG C by 650 DEG C, prevents coal gas of converter between this temperature, producing blast (gas explosion limiting temperature 600 DEG C ~ 500 DEG C).9) adopt purified gas cooler, the gas temperature after sack cleaner can be down to 60 DEG C by 150 DEG C, reclaim the heat energy in coal gas, and the moisture content in coal gas is removed, thus improve the calorific value of coal gas.10) owing to being provided with intensification valve sets and cooling valve sets at the arrival end of air and gas mixer, gas temperature in air and gas mixer can be controlled and, between 150 DEG C ~ 200 DEG C, guarantee that bag-type dust removing system security of operation is stablized.11) be provided with bypass accessory system, while guaranteeing that the whole process of the heat energy in high-temperature flue gas is recycled, deliver to secondary dedusting system when oxygen index (OI) in coal gas and CO content do not meet when recovery requires, guarantee this security of system reliability service.
In sum, the invention have compared with OG method and LT method technique simple, to invest and floor space is little, Automated condtrol precision is high, safe and reliable to operation, thoroughly solve consumption and the secondary pollution problem of water, heat energy in coal gas is recovered utilization, and operating cost is low, and dust content of gas is low, system cloud gray model resistance is little, calorific value of gas is high, economic benefit and environmental benefit superior, omnidistance energy recovery achieves low energy consumption or Non-energy-consumption pneumatic steelmaking.
Accompanying drawing explanation
Fig. 1 is the structural representation of the invention.
Detailed description of the invention
As shown in Figure 1, a kind of converter gas full-dry method pocket type reclaiming clean process system, by waste heat boiler (1), water-cooled flue (2), one-level waste heat boiler (3), spray cooler (4), device for cooling ash (5), secondary waste heat boiler (6), intensification valve sets (7), three-way switch valve (8), bypass blower fan (9), air and gas mixer (10), some dry-method bag-type dedusters (11), gas fan (12), low cruise valve sets (13), purified gas cooler (14), cooling valve sets (15), explosion venting device (16), totally-enclosed ash conveying device (17), ash-storing bin (18) and control system (19) composition.
Waste heat boiler (1) outlet connects water-cooled flue (2), water-cooled flue (2) outlet connects one-level waste heat boiler (3), one-level waste heat boiler (3) outlet connects spray cooler (4), spray cooler (4) outlet is connected with secondary waste heat boiler (6) entrance by device for cooling ash (5), secondary waste heat boiler (6) entrance is connected with air and gas mixer (10) entrance with intensification valve sets (7) by the road, secondary waste heat boiler (6) outlet is connected with air and gas mixer (10) entrance with bypass blower fan (9) respectively by three-way switch valve (8), air and gas mixer (10) outlet is connected with the dry-method bag-type deduster (11) of some laid out in parallel, dry-method bag-type deduster (11) outlet connects gas fan (12), gas fan (12) outlet connects purified gas cooler (14), purified gas cooler (14) outlet is connected with gaspipe network, be connected with cooling valve sets (15) by the road between purified gas cooler (14) outlet and air and gas mixer (10) entrance, gas fan (12) entrance end is provided with low cruise valve sets (13), some dry-method bag-type dedusters (11) are connected with explosion venting device (16), device for cooling ash (5) is connected a totally-enclosed ash conveying device (17) respectively with some dry-method bag-type deduster (11) bottoms, totally-enclosed ash conveying device (17) is connected with ash-storing bin (18) by the road.
The processing step of above-mentioned converter gas full-dry method pocket type reclaiming clean process system is as follows:
Converter top is provided with waste heat boiler, and the coal gas of high temperature that converter produces in smelting process enters waste heat boiler by petticoat pipe, is down to about 950 DEG C through water-cooled flue gas temperature, cools the temperature to about 650 DEG C by one-level waste heat boiler; Through spray cooler, gas temperature is down to rapidly about 450 DEG C by 650 DEG C again, prevent coal gas of converter between this temperature, producing blast (gas explosion limiting temperature 600 DEG C ~ 500 DEG C), from spray cooler coal gas out again after secondary waste heat boiler gas temperature reduce to 150 DEG C ~ 200 DEG C, so that follow-up pocket type reclaims.I and II waste heat boiler and spray cooler have thick dedusting function simultaneously, and now coal gas of converter dustiness is about 60g/m 3, the steam supply gas fired-boiler of generation or outer net use.
This technique has set up bypass accessory system, while guaranteeing that the whole process of the heat energy in high-temperature flue gas is recycled, does not meet when recovery requires deliver to secondary dedusting system by bypass blower fan to oxygen index (OI) in coal gas and CO content.
During normal work, coal gas is after secondary waste heat boiler is lowered the temperature again, and temperature is down to 150 DEG C ~ 200 DEG C, then enters air and gas mixer through outlet and three-way switch valve, ensure the gas temperature entered in air and gas mixer, to guarantee that dry-method bag-type deduster security of operation is stablized.When entering the gas temperature in air and gas mixer lower than 150 DEG C, opening intensification valve sets, the raw coke oven gas of secondary exhaust-heat boiler inlet 450 DEG C being introduced air and gas mixer by intensification valve sets, mixes with low temperature coal gas, make temperature control at 150 DEG C ~ 200 DEG C; When gas temperature is higher than 200 DEG C, open cooling valve sets, the purified gas of purified gas cooler outlet about 60 DEG C is introduced air and gas mixer by cooling valve sets, mixes with coal gas, temperature is controlled at 150 DEG C ~ 200 DEG C.Guarantee that bag-type dusting is effectively working properly, prevent condensation.
Coal gas is after elementary pretreatment (150 DEG C ~ 200 DEG C), and after by the dry-method bag-type deduster dedusting of some laid out in parallel, dust content of gas is less than 5mg/Nm3.
Coal gas after purification enters purified gas pipe network by gas fan through purified gas cooler, is provided with low cruise valve sets at gas fan entrance end, ensures the low speed idle operation of gas fan during not gas recovery.Coal gas after purification is dropped to 60 DEG C from 150 DEG C ~ 200 DEG C by purified gas cooler, meets and enters pipe network and gas chamber requirement, and by its energy recovery.
Coal gas of converter is when I and II waste heat boiler and spray cooler, coarse grained dust is deposited in device for cooling ash under the effect of self gravitation, coal gas is through dry-method bag-type deduster trapping fine dust, the dust collected by device for cooling ash and dry-method bag-type deduster is delivered in ash-storing bin by totally-enclosed ash conveying device, is regularly transported to appointed place and uses.
On waste heat boiler, sack cleaner body and system pipe network place be respectively equipped with explosion venting device, ensure this security of system stable operation.
Overall process process system is controlled by control system.

Claims (1)

1. converter gas full-dry method pocket type reclaiming clean process system, it is characterized in that: by waste heat boiler (1), water-cooled flue (2), one-level waste heat boiler (3), spray cooler (4), device for cooling ash (5), secondary waste heat boiler (6), intensification valve sets (7), three-way switch valve (8), bypass blower fan (9), air and gas mixer (10), some dry-method bag-type dedusters (11), gas fan (12), low cruise valve sets (13), purified gas cooler (14), cooling valve sets (15), explosion venting device (16), totally-enclosed ash conveying device (17), ash-storing bin (18) and control system (19) composition,
Waste heat boiler (1) outlet connects water-cooled flue (2), water-cooled flue (2) outlet connects one-level waste heat boiler (3), one-level waste heat boiler (3) outlet connects spray cooler (4), spray cooler (4) outlet is connected with secondary waste heat boiler (6) entrance by device for cooling ash (5), secondary waste heat boiler (6) entrance is connected with air and gas mixer (10) entrance with intensification valve sets (7) by the road, secondary waste heat boiler (6) outlet is connected with air and gas mixer (10) entrance with bypass blower fan (9) respectively by three-way switch valve (8), air and gas mixer (10) outlet is connected with the dry-method bag-type deduster (11) of some laid out in parallel, dry-method bag-type deduster (11) outlet connects gas fan (12), gas fan (12) outlet connects purified gas cooler (14), purified gas cooler (14) outlet is connected with gaspipe network, be connected with cooling valve sets (15) by the road between purified gas cooler (14) outlet and air and gas mixer (10) entrance, gas fan (12) entrance end establishes low cruise valve sets (13), some dry-method bag-type dedusters (11) are connected with explosion venting device (16), device for cooling ash (5) is connected totally-enclosed ash conveying device (17) respectively with some dry-method bag-type deduster (11) bottoms, totally-enclosed ash conveying device (17) is connected with ash-storing bin (18) by the road.
CN201310285499.0A 2013-07-09 2013-07-09 Converter gas dry method bag-type recovering and purifying process system Active CN103333987B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103757175A (en) * 2014-01-17 2014-04-30 辽宁环宇环保技术有限公司 Converter high-temperature flue gas heat recovery and dust purification system
CN107034335A (en) * 2017-05-18 2017-08-11 中冶节能环保有限责任公司 A kind of process system and method to ultra-clean dedusting of flue gas of converter
CN111336530A (en) * 2020-03-12 2020-06-26 成都易态科技有限公司 System and method for recovering raw gas energy of ore furnace

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101532069A (en) * 2009-04-14 2009-09-16 江苏中金环保科技有限公司 Device for recycling flue gas of steelmaking converters through full-dry purification and process thereof
CN102071281A (en) * 2011-02-25 2011-05-25 辽宁环宇环保技术有限公司 Converter gas dry method bag type recovering and purifying system and process
CN203403124U (en) * 2013-07-09 2014-01-22 辽宁环宇环保技术有限公司 All-dry method bag type recycling and purifying technology system for converter gas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101532069A (en) * 2009-04-14 2009-09-16 江苏中金环保科技有限公司 Device for recycling flue gas of steelmaking converters through full-dry purification and process thereof
CN102071281A (en) * 2011-02-25 2011-05-25 辽宁环宇环保技术有限公司 Converter gas dry method bag type recovering and purifying system and process
CN203403124U (en) * 2013-07-09 2014-01-22 辽宁环宇环保技术有限公司 All-dry method bag type recycling and purifying technology system for converter gas

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Address after: 115100 South Outer Ring Development Zone, Yingkou, Liaoning, Dashiqiao

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