CN101476007B - Dry dust collection method and apparatus for blast furnace gas - Google Patents

Dry dust collection method and apparatus for blast furnace gas Download PDF

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Publication number
CN101476007B
CN101476007B CN 200810236213 CN200810236213A CN101476007B CN 101476007 B CN101476007 B CN 101476007B CN 200810236213 CN200810236213 CN 200810236213 CN 200810236213 A CN200810236213 A CN 200810236213A CN 101476007 B CN101476007 B CN 101476007B
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China
Prior art keywords
gas
blast furnace
coal gas
dehydrating unit
raw
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CN 200810236213
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Chinese (zh)
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CN101476007A (en
Inventor
尹华勤
许祖根
许志伟
许志庆
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无锡红旗除尘设备有限公司
尹华勤
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Priority to CN 200810236213 priority Critical patent/CN101476007B/en
Publication of CN101476007A publication Critical patent/CN101476007A/en
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Publication of CN101476007B publication Critical patent/CN101476007B/en

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Abstract

A blast furnace gas dry type dust collection method, a paralleled gas drying equipment is provided after the gravity dust collector and before the cloth bag dust remover in the blast furnace gas dry type dust collection system as a constituent part of the blast furnace gas dry type dust collection system, and a temperature sensor is provided on the export of the gravity dust collector; when the system export (the blast furnace) generates low-temperature raw coal gas, the humidity is usually relatively high, before the cloth bag dust remover performs dust exhaustion, the gas from the export of the gravity dust collector passes through the paralleled gas drying equipment, the gas drying equipment firstly performs dehumidification processing to the raw coal gas to remove the water in the raw coal gas, and then enters into the cloth bag dust remover for dust exhaustion; when the temperature of the blast furnace raw coal gas is in a normal range, the blast furnace raw coal gas enters the gravity dust collector through a raw gas pipeline to perform coarse dust exhaustion, and then directly enters the cloth bag dust remover for dust exhaustion, the clean gas after dust exhaustion enter in the pressure reducing valve through a clean gas pipeline for pressure reduction, and finally loads in a gas holder through the clean gas pipeline.

Description

The blast furnace gas dry dusting method and apparatus

Technical field

The invention belongs to the dedusting technology field, particularly a kind of blast furnace gas dry dusting novel process that has the coal gas dehydrating unit comprises method for dust removal and device.

Background technology

Existing blast furnace gas dry dusting technology is mainly by raw gas pipeline, gravitational precipitator, sack cleaner, reducing valve group, purified gas pipeline and diffuse chimney etc. and form.Wherein play the sack cleaner of main dedusting effect, handle gas temperature between 90 ℃~250 ℃.Gas temperature is low excessively, the filter bag dewfall, and dust bonding not only increases the breakage of filter bag, also gives and unloads ash, defeated ash causes difficulty, directly influences the normal operation of dust-removal system.For sack cleaner is normally moved, the coal gas that never allowable temperature is low excessively gets into sack cleaner, can only get into by-pass line through diffusing smoke stack emission.A large amount of so poisonous dust-laden coal gas directly enter atmosphere, have both lost the considerable energy, again environment are caused great pollution.

Summary of the invention

The present invention seeks to: can handle low temperature coal gas for making dust-removal system; Avoid environmental pollution; The energy that reclaim more; Task of the present invention provides a kind of blast furnace gas dry dusting novel process and isolated plant that has the coal gas dehydrating unit, and it has solved that existing blast furnace gas dry dusting technology can not be handled low temperature coal gas and the problem that can only diffuse.

Technical scheme of the present invention is following: the blast furnace gas dry dusting method; In the blast furnace gas dry dusting system, set up the coal gas dehydrating unit 3 of parallel connection after the gravitational precipitator 2; And it is arranged on the sack cleaner front; As an integral part of blast furnace gas dry dusting system, the gravitational precipitator outlet is provided with TP; When system outlet is blast furnace generation low temperature raw gas; Usually psychromatic ratio is higher; Before sack cleaner carries out dedusting; Coal gas dehydrating unit from the coal gas of gravitational precipitator outlet from parallel connection carries out dehumidification treatments by the coal gas dehydrating unit to the low temperature raw gas earlier, gets into the sack cleaner dedusting after removing the moisture in the raw gas.Water becomes liquid state by gaseous state in dehumidification process, can discharge great amount of heat, and these heats have heated the low temperature raw gas again, and the raw gas temperature is raise.After coal gas dehydrating unit dehumidification treatments, raw gas humidity<50~55%, temperature>90 ℃ are satisfied the sack cleaner operating requirement fully.Behind the coal gas dehydrating unit, meet the requirements of raw gas and can get into sack cleaner and carry out dedusting, the purified gas after the dedusting just can be recycled.

The dehydrating unit that blast furnace gas dry dusting is used; Between gravitational precipitator 2 in the blast furnace gas dry dusting system and sack cleaner, set up parallelly connected coal gas dehydrating unit; Said coal gas dehydrating unit tube structure; Inside is provided with multilayer dehumidifying layer, between each dehumidifying layer, the coal gas division plate is set, and makes coal gas be divided into several roads respectively through each dehumidifying layer.

Be to adapt to the characteristics of blast furnace gas, the coal gas dehydrating unit has particular requirement, requires airtight can not the leakage, and will bear certain pressure and temperature, WP>0.2MPa, working temperature>250 ℃.Coal gas dehydrating unit housing is a tube structure, and inside is provided with multilayer dehumidifying layer, between each dehumidifying layer, the coal gas division plate is set, and makes coal gas be divided into several roads respectively through each dehumidifying layer.

After moisture adsorbent absorption moisture in the dehydrating unit acquires a certain degree, need moisture adsorbent be taken out usually, put the regenerating unit of other setting into, consumes energy is carried out thermal regeneration to it.The regeneration of this coal gas dehydrating unit moisture adsorbent need not taken out moisture adsorbent, and blast furnace gas temperature can directly get into coal gas dehydrating unit heating moisture adsorbent when 200 ℃ of left and right sides, make moisture adsorbent regeneration, has saved the regenerating unit and the energy.

The invention has the beneficial effects as follows: though at present dedusting of blast furnace gas has two kinds of wet method and dry method, dedusting technology is each has something to recommend him.But the present invention can carry out whole process to blast furnace gas to be handled, and makes dry dedusting technology further perfect, the purified gas better quality; Coal-gas recovering is more; The energy-saving and environmental protection effect is obvious, has given full play to the meliority of dry dedusting technology, can replace the wet dedusting technology fully.

Description of drawings

Fig. 1 is a kind of blast furnace gas dry dusting new technological flow synoptic diagram that has the coal gas dehydrating unit of the present invention.

Fig. 2 is a coal gas dehydrating unit structural representation.

Embodiment

Referring to Fig. 1, the present invention is a kind of blast furnace gas dry dusting novel process that has the coal gas dehydrating unit, and it comprises raw gas pipeline 1, gravitational precipitator 2, coal gas dehydrating unit 3, sack cleaner 4, reducing valve group 5, purified gas pipeline 6 and diffuses chimney 7.

Coal gas dehydrating unit 3 is cylindrical structures.Coal gas dehydrating unit 3 comprises inlet pipe 3-1, housing 3-2, dehumidifying layer (containing moisture adsorbent) 3-3, division plate 3-4, escape pipe 3-5.And the intravital dehumidifying layer of shell is multilayer dehumidifying layer, between each dehumidifying layer, the coal gas division plate is set, and makes coal gas be divided into several roads respectively through each dehumidifying layer; Inlet pipe 3-1, escape pipe 3-5 are located on the housing.

The end of dehumidifying layer 3-3 is connected with inlet pipe 3-1, division plate 3-4 lower side, and dehumidifying layer (containing moisture adsorbent) 3-3 the other end is connected with division plate 3-4 upside, escape pipe 3-5 respectively.Dehumidifying layer (containing moisture adsorbent) 3-3 two avris also are connected with housing 3-2; Dehumidifying layer horizontal positioned places on the reticular lamina.The moisture adsorbent of dehumidifying moisture adsorbent layer can adopt inorganic materials such as calcium chloride, silica gel, quicklime.

Housing 3-2 is a tube structure.Housing 3-2 is connected with inlet pipe 3-1, dehumidifying layer (containing moisture adsorbent) 3-3, division plate 3-4, escape pipe 3-5 respectively.

Dehumidifying layer (containing moisture adsorbent) 3-3 one end is connected with inlet pipe 3-1, division plate 3-4 lower side respectively, and dehumidifying layer (containing moisture adsorbent) 3-3 the other end is connected with division plate 3-4 upside, escape pipe 3-5 respectively.Dehumidifying layer (containing moisture adsorbent) 3-3 two avris also are connected with housing 3-2;

Division plate 3-4 lower side is connected with inlet pipe 3-1, dehumidifying layer (containing moisture adsorbent) 3-3 one end respectively, and division plate 3-4 upside is connected with dehumidifying layer (containing moisture adsorbent) 3-3 the other end, escape pipe 3-5 respectively.Division plate 3-4 two avris also are connected with housing 3-2;

Coal gas dehydrating unit 3 is arranged between gravitational precipitator 2 and the sack cleaner 4, and the inlet pipe 3-1 of coal gas dehydrating unit 3 is connected with the raw gas pipeline 1 of both sides respectively with escape pipe 3-5.

Gravitational precipitator 2 is cylindrical structures.Gravitational precipitator 2 is arranged between blast furnace and the coal gas dehydrating unit 3; Gravitational precipitator 2 top inlet mouths connect with the raw gas pipeline that is connected blast furnace 1, and gravitational precipitator 2 air outlets connect with the raw gas pipeline 1 that is connected coal gas dehydrating unit 3 and connection sack cleaner 4.

Sack cleaner 4 is cylindrical structures.Sack cleaner 4 is arranged between raw gas pipeline 1 and the purified gas pipeline 6, and sack cleaner 4 bottom inlet mouths are connected with raw gas pipeline 1, and sack cleaner 4 tops are connected with purified gas pipeline 6;

Reducing valve group 5 is arranged between sack cleaner 4 and the gas holder, high-pressure side and the purified gas pipe connection that is connected sack cleaner 4, low pressure end and the purified gas pipe connection that is connected gas holder;

Diffusing chimney 7 is cylindrical structures.Diffuse chimney 7 bottom inlet mouths and be connected, diffuse chimney 7 top venting ports and be communicated with atmosphere with the raw gas pipeline 1 that is in sack cleaner 4 upper reaches

Raw gas pipeline 1 is a cylindrical structure.Blast furnace, gravitational precipitator 2, coal gas dehydrating unit 3, sack cleaner 4, diffuse each equipment such as chimney 7 and connect through raw gas pipeline 1.

Purified gas pipeline 6 is cylindrical structures.Sack cleaner 4 is connected through purified gas pipeline 6 with gas holder with reducing valve group 5, reducing valve group 5.

Blast furnace gas dry dusting novel process workflow of the present invention is following:

1. work as blast furnace raw gas temperature in normal range; The blast furnace raw gas gets into gravitational precipitator 2 through raw gas pipeline 1 and carries out thick dedusting; Get into sack cleaner 4 dedustings through raw gas pipeline 1 then; Get into 5 decompressions of reducing valve group through the purified gas after the dedusting through purified gas pipeline 6, send into gas holder through purified gas pipeline 6 at last.

2. it is low excessively to work as blast furnace raw gas temperature, and the blast furnace raw gas gets into gravitational precipitator 2 through raw gas pipeline 1 and carries out thick dedusting, gets into coal gas dehydrating unit 3 through raw gas pipeline 1 bypass then.In coal gas dehydrating unit 3, raw gas at first through inlet pipe 3-1, gets into the multiplexer channel that is surrounded by division plate 3-4 respectively then.Dehumidifying layer (containing moisture adsorbent) 3-3 in passage carries out dehumidification treatments to raw gas, and the raw gas temperature raises in the time of dehumidifying.Raw gas after dehumidifying heats up is discharged coal gas dehydrating unit 3 via escape pipe 3-5; Get into sack cleaner 4 dedustings through raw gas pipeline 1 then; Get into 5 decompressions of reducing valve group through the purified gas after the dedusting through purified gas pipeline 6, send into gas holder through purified gas pipeline 6 at last.The present invention can adopt the humidity of regularly moisture adsorbent being regenerated or passing through humidity sensor detection coal gas dehydrating unit 3 air outlets, in certain humidity range, is regenerating, even the regeneration passage is opened.

3. break down when blast furnace or dust-removal system, the blast furnace raw gas gets into gravitational precipitator 2 through raw gas pipeline 1, directly sends into through raw gas pipeline 1 then and diffuses chimney 7 and discharge.

4. when the moisture adsorbent in the coal gas dehydrating unit need be regenerated, about 200 ± 40 ℃ blast furnace raw gas are got into gravitational precipitator 2 through raw gas pipeline 1 carry out thick dedusting, get into coal gas dehydrating unit 3 through raw gas pipeline 1 bypass then.In coal gas dehydrating unit 3, raw gas at first through inlet pipe 3-1, gets into the multiplexer channel that is surrounded by division plate 3-4 respectively then.Raw gas carries out thermal regeneration to the moisture adsorbent in the dehumidifying layer 3-3 in passage; And the raw gas temperature of coal gas dehydrating unit 3 is discharged in control via escape pipe 3-5; Raw gas gets into sack cleaner 4 dedustings through raw gas pipeline 1 then; Get into 5 decompressions of reducing valve group through the purified gas after the dedusting through purified gas pipeline 6, send into gas holder through purified gas pipeline 6 at last.Stop in the time of can adopting regularly dehumidifying or the humidity through the outlet of humidity sensor measurement coal gas dehydrating unit to be lower than certain humidity.Will regularly carry out deashing to dust-removal system equipment, the flue dust behind the deashing will regularly be discharged.Certainly; Those skilled in the art in the present technique field will be appreciated that; The foregoing description only is to be used for explaining the present invention; And be not with opposing qualification of the present invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.

Claims (5)

1. blast furnace gas dry dusting method; It is characterized in that in the blast furnace gas dry dusting system, being provided with after the gravitational precipitator coal gas dehydrating unit of parallel connection; And it is arranged on the sack cleaner front; As an integral part of blast furnace gas dry dusting system, the gravitational precipitator outlet is provided with TP; When blast furnace produces the low temperature raw gas; Usually psychromatic ratio is higher; Before sack cleaner carries out dedusting; Through coal gas dehydrating unit, by coal gas dehydrating unit low temperature raw gas carried out dehumidification treatments earlier from the coal gas of gravitational precipitator outlet, get into the sack cleaner dedusting again after removing the moisture in the raw gas from parallel connection; When the moisture adsorbent in the coal gas dehydrating unit need be regenerated, 200 ± 40 ℃ blast furnace raw gas are got into gravitational precipitator through raw gas pipeline I carry out thick dedusting, get into the dehumidifying of coal gas dehydrating unit through raw gas pipeline II bypass then;
When blast furnace raw gas temperature in normal range; The blast furnace raw gas gets into gravitational precipitator through raw gas pipeline I and carries out thick dedusting; Then through directly getting into the sack cleaner dedusting; Get into the decompression of reducing valve group through the purified gas after the dedusting through purified gas pipeline I, send into gas holder through purified gas pipeline II at last.
2. blast furnace gas dry dusting method according to claim 1; It is characterized in that raw gas passes through inlet pipe; Get into the coal gas dehydrating unit then; The coal gas dehydrating unit is made up of the multiplexer channel that division plate surrounds, and in every paths, is equipped with raw gas dehumidifying moisture adsorbent layer, is dehumidified or is heated regeneration by moisture adsorbent.
3. blast furnace gas dry dusting method according to claim 2 is characterized in that regularly moisture adsorbent being regenerated or regenerating through the humidity of humidity sensor detection coal gas dehydrating unit air outlet.
4. blast furnace gas dry dusting device; It is characterized in that in the blast furnace gas dry dusting system, being provided with after the gravitational precipitator coal gas dehydrating unit of parallel connection; And it is arranged on the sack cleaner front, said coal gas dehydrating unit is made up of housing, inlet pipe, dehumidifying layer, division plate, escape pipe; The intravital dehumidifying layer of shell is multilayer dehumidifying layer, between each dehumidifying layer, the coal gas division plate is set, and makes coal gas be divided into several roads respectively through each dehumidifying layer; Inlet pipe, escape pipe are located on the housing; Dehumidifying layer horizontal positioned places on the reticular lamina.
5. blast furnace gas dry dusting device according to claim 4, characteristic are that said coal gas dehydrating unit housing is a cylindrical structure.
CN 200810236213 2008-11-18 2008-11-18 Dry dust collection method and apparatus for blast furnace gas CN101476007B (en)

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Application Number Priority Date Filing Date Title
CN 200810236213 CN101476007B (en) 2008-11-18 2008-11-18 Dry dust collection method and apparatus for blast furnace gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200810236213 CN101476007B (en) 2008-11-18 2008-11-18 Dry dust collection method and apparatus for blast furnace gas

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CN101476007B true CN101476007B (en) 2012-12-05

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Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102888477A (en) * 2012-09-28 2013-01-23 中冶南方工程技术有限公司 Top even pressure gas recovery device and technology for blast furnace and technology
CN105256091A (en) * 2015-10-30 2016-01-20 太仓东能环保设备有限公司 Dry dedusting technology for blast furnace gas
CN106215557A (en) * 2016-08-29 2016-12-14 合肥合意环保科技工程有限公司 A kind of dehydrator frosting resistance glass fiber bag type cleaner
CN106215559A (en) * 2016-08-29 2016-12-14 合肥合意环保科技工程有限公司 A kind of long bag and low pulse bag-type dust collecting equipment
CN106268135A (en) * 2016-08-29 2017-01-04 合肥合意环保科技工程有限公司 One faces formula pulse bag-type dust-removing device directly
CN106215558A (en) * 2016-08-29 2016-12-14 合肥合意环保科技工程有限公司 A kind of sack cleaner with air cleaner
CN106268076A (en) * 2016-08-29 2017-01-04 合肥合意环保科技工程有限公司 A kind of Novel pulse exhaust dust device with bag
CN106178791A (en) * 2016-08-29 2016-12-07 合肥合意环保科技工程有限公司 A kind of dust removing device for refuse incineration
CN106268136A (en) * 2016-08-29 2017-01-04 合肥合意环保科技工程有限公司 A kind of unit pulse bag-type dust-removing device
CN106390622A (en) * 2016-08-29 2017-02-15 合肥合意环保科技工程有限公司 Electrical charge bag-type dust remover
CN106215556A (en) * 2016-08-29 2016-12-14 合肥合意环保科技工程有限公司 A kind of shaft kiln glass cleaner
CN106178727A (en) * 2016-08-29 2016-12-07 合肥合意环保科技工程有限公司 A kind of air box impulse bag-type cleaner
CN109439827A (en) * 2018-12-06 2019-03-08 东北大学 A kind of blast furnace raw gas heats up dust pelletizing system online

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