CN108246021B - PM in a kind of concentration removing agglomeration for iron mine flue gas2.5Again/alkali metal method - Google Patents
PM in a kind of concentration removing agglomeration for iron mine flue gas2.5Again/alkali metal method Download PDFInfo
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- CN108246021B CN108246021B CN201711457948.XA CN201711457948A CN108246021B CN 108246021 B CN108246021 B CN 108246021B CN 201711457948 A CN201711457948 A CN 201711457948A CN 108246021 B CN108246021 B CN 108246021B
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- flue gas
- alkali metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- Chemical Kinetics & Catalysis (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses PM in a kind of concentration removing agglomeration for iron mine flue gas2.5Again/alkali metal method.This method is that sintering flue gas is divided into three parts: PM2.5Again/alkali metal discharge ratio is high, temperature is low, H2The high leading portion flue gas of O (g) content, PM2.5Again/alkali metal discharge ratio is high, temperature is high, H2The low middle section flue gas of O (g) content, PM2.5Again/alkali metal discharge ratio is low, temperature is high, H2The low endpiece flue gas of O (g) content；The flue gas of leading portion, endpiece is imported into low emission flue, and uses routine intravenous electric cleaner dedusting；The flue gas in middle section is imported into maximum discharge flue, and PM is directly removed using high temperature resistant filter membrane2.5Again/alkali metal.This method is segmented by flue gas, realizes high PM2.5, again/alkali metal is efficient, Concetrated control, and be conducive to the recycling of high-grade fume afterheat.
Description
Technical field
The present invention relates to a kind of agglomeration for iron mine flue gas processing method, in particular in a kind of concentration removing agglomeration for iron mine flue gas
PM2.5Again/alkali metal method；Belong to Ferrous Metallurgy fume treatment technical field.
Background technique
Agglomeration for iron mine is the first step high-temperature process of entire smelting iron and steel process, while consuming a large amount of materials, the energy,
Outlet exhausted air quantity also accounts for 40% or more steel and iron industry total amount, is the main source of atmospheric pollution of steel and iron industry.It is removed in sintering flue gas
Containing the gaseous contaminations beyond the region of objective existence such as COx, NOx, SOx, also contain PM2.5Ultra-fine grain pollutant, again/alkali metal, discharge amount account for steel
40%, 50% or more of iron industry total emission volumn.Therefore, effectively control sintering process PM2.5, again/alkali metal discharge amount is to drop
Low entire steel industry ultra-fine grain pollutant, the discharge of again/alkali metal are significant.
Country's sintering machine head dust removing mainly uses electrostatic precipitator at present, and ratio is up to 84.2%, to total particle in flue gas
The removal efficiency of object is up to 99% or more, but superfine particulate matter of the partial size less than 2.5 μm easily loads weight/alkali metal chloride, than
Resistance is typically up to 1012-1013Ω cm, to be also easy to produce inverse corona in the electric field, reentrainment of dust causes removal efficiency low.Mesh
Before, China's sintering plant exhaust gas dust average emission concentration is about 102mg/m3, wherein 80% dust is ultra-fine grain pollutant,
The concentration of emission also with maximum concentration 50mg/m specified in " steel sintering, pelletizing industrial air pollution object discharge standard "3's
There are larger gaps for discharge standard, with 20mg/m specified in the standard revision list exposure draft3Emission limit gap is bigger.
To sintering process ultra-fine grain pollutant PM2.5, heavy metal emission reduction face huge environmental protection pressure.
Currently, rarely having both at home and abroad for sintering flue gas PM2.5, the research of again/alkali metal Prevention Technique report, PM2.5Discharge
The research of control technology is concentrated mainly on coal-fired field, mainly includes two types: 1. process absorption and control technology；2. particulate matter
Agglomeration techniques.Because addition solid, adsorbent exist new impurity is introduced into mixture or be difficult to carry out in sinter bed
Deficiency, process adsorption technology do not adapt to sintering demand；Because sintering flue gas flow is big, (3000- is about discharged in 1t sinter
4300m3Exhaust gas), PM2.5Concentration of emission is lower, and reunion preconditioning technique is difficult to obtain efficient, inexpensive application.For weight/
The control of alkali metal discharge also mainly realizes the reduction of its discharge amount by improving particulate matter removing efficiency.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the invention is to provide in a kind of concentration removing agglomeration for iron mine flue gas
PM2.5, again/alkali metal method；This method is according to sintering different phase PM2.5, again/alkali metal discharge ratio and moisture content etc.
Difference, by different PM2.5, again/alkali metal discharge ratio and moisture content etc. flue gas be directed respectively into different flues and separately locate
Reason, realizes PM in flue gas2.5, again/alkali metal concentration removing.
In order to achieve the above technical purposes, the present invention provides PM in a kind of concentration removing agglomeration for iron mine flue gas2.5Again/
The method of alkali metal, method includes the following steps:
1) according to PM2.5And the burning that heavy metal and alkali metal discharge amount, moisture content and temperature characterisitic generate sintering stage
Knot flue gas is divided into leading portion flue gas, middle section flue gas and endpiece flue gas；PM in leading portion flue gas2.5Discharge amount accounts for sintering stage PM2.5Always
Discharge amount 35% or less, heavy metal and alkali metal discharge amount account for the 35% of sintering stage heavy metal and alkali metal total release with
Under, flue-gas temperature≤100 DEG C and Water Vapor Quality degree >=10%；PM in the flue gas of middle section2.5Discharge amount accounts for sintering stage
PM2.5Total release 55~70%, heavy metal and alkali metal discharge amount account for sintering stage heavy metal and alkali metal total release
60~75%, flue-gas temperature is 60~450 DEG C, Water Vapor Quality degree is not more than 5%；PM in endpiece flue gas2.5Discharge
Amount accounts for sintering stage PM2.5Total release 10% or less, heavy metal and alkali metal discharge amount account for sintering stage heavy metal and alkali gold
Belong to that the 10% or less of total release, flue-gas temperature is 350~450 DEG C, Water Vapor Quality degree is less than 5%；
2) leading portion flue gas and endpiece flue gas are converged into importing discharge flue I control mixed flue gas temperature and is higher than acid dew point temperature
Degree, after electric precipitator removes dirt, direct emission；
3) middle section flue gas is imported into discharge flue II, after high temperature resistant dust-filtering film dedusting, into residual neat recovering system
Recovery waste heat.
Preferred scheme, PM in leading portion flue gas, middle section flue gas and endpiece flue gas2.5Content account for sintering stage PM2.5Total row
The ratio that the content of ratio or heavy metal and alkali metal high-volume accounts for sintering stage heavy metal and alkali metal total release use with
Lower formula is calculated:
In formula,
I indicates to be sintered each stage；
tiThe duration of expression stage i, unit h；
wiTable PM10Or PM2.5In the concentration of emission of stage i, unit mg/m3；
QiThe flue gas flow of expression stage i, unit m3/h；
BiIndicate PM2.5Or heavy metal and alkali metal account for the percentage of total release, % in the discharge amount of stage i.
Preferred scheme, the high temperature resistant dust-filtering film include ceramic filter membrane, intermetallic compound filter membrane, metal
Tunica fibrosa, glass fibre filter membrane, Teflon filtration film or polyphenylene sulfide overlay film.
Preferred scheme, the acid dew-point temperature are 110 DEG C.
Preferred scheme, the flue-gas temperature after residual neat recovering system heat exchange are 110~130 DEG C.
The present invention is big according to agglomeration for iron mine exhaust gas volumn, and to sintering end point is reached since sintering ignition, difference is sintered rank
The flue-gas temperature of section discharge, H2O (g) content and ultra-fine grain pollutant, again/biggish spy of alkali metal contaminants proportional difference
Point, in conjunction with sintering flue gas different phase super-P M2.5, again/alkali metal discharge ratio and flue-gas temperature, H2The variation of O (g) content
Feature proposes sintering flue gas being divided into leading portion flue gas, middle section flue gas and endpiece flue gas, then the flue gas of different phase is separated
Processing, leading portion flue gas are that igniting starts to flue-gas temperature to rise last stage flue gas, and middle section flue gas is that temperature is gradually increasing the stage
Flue gas, endpiece flue gas are that sintering is completed to sinter discharging phase flue gas.Wherein, the PM of middle section flue gas2.5High, again/alkali metal row
Put ratio height, and high temperature, low H2The flue gas of O (g) is directly filtered using high temperature resistant filter membrane, can be concentrated and be realized particulate matter and gold
Belong to stability and high efficiency removing.
Compared with the prior art, technical solution of the present invention bring the utility model has the advantages that
(1) by the way that sintering flue gas to be segmented, low PM is realized2.5, again/alkali metal discharge ratio and lower the burning of temperature
Tie flue gas and high PM2.5The sintering leading portion flue gas shunting of discharge, Gao Chong/alkali metal discharge amount and high temperature, is conducive to high PM2.5、
Gao Chong/alkali metal discharge ratio flue gas Concetrated control.
(2) compared with the electrostatic precipitator that current flue gas of sintering machine head dedusting generallys use, using high temperature resistant filter membrane
Purification efficiency will not, weight alkali metal small because of particle size content it is high due to cause efficiency of dust collection to reduce, thus can realize PM2.5、
The stability and high efficiency of weight/alkali metal removes.
(3) using high temperature resistance diaphragm directly to high PM2.5, Gao Chong/alkali metal discharge ratio high-temperature flue gas administered, only
Flue gas after change is directly entered heat-exchange system, is conducive to the recycling of high-temperature flue gas waste heat.
(4) by sintering flue gas segment processing, the high concentration H in low emission section flue gas is avoided2O (g) is to high temperature section dedusting
System-down starts shipment process because a large amount of condensation of moisture bring dust block membrane pores problem, is conducive to extend high-temperature dust removal film
Service life, guarantee equipment stabilization, efficiently, low-resistance operation.
Detailed description of the invention
[Fig. 1] is pallet difference bellows flue-gas temperature, H2The variation characteristic of O (g) content；
[Fig. 2] is PM in pallet difference bellows2.5, again/alkali metal concentration of emission variation characteristic.
Specific embodiment
To facilitate the understanding of the present invention, present invention work more comprehensively, is meticulously described below in conjunction with preferred embodiment,
But the protection scope of the present invention is not limited to the following specific embodiments.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art
It is identical.Patent term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention
Protection scope.
Except there is a special instruction, the various reagents used in the present invention, raw material be can commodity commercially or
Person can the product as made from well known method.
Embodiment 1
According to the temperature of flue gas, H in different bellows2O (g) content (see Fig. 1) and PM2.5, again/alkali metal concentration of emission
(see Fig. 2), sintering flue gas is divided into three sections: sintering stage leading portion is 1#-13#Bellows；Sintering stage middle section is 14#-20#Bellows；
Sintering stage endpiece is 21#-24#Bellows.Different phase flue-gas temperature, H2O (g) content and PM2.5, again/alkali metal discharge amount
The ratio for accounting for total release is shown in Table 1.The flue gas for being sintered leading portion, sintering endpiece discharge is imported into low emission flue, and using conventional
Electrostatic precipitator dedusting.The flue gas for being sintered middle section discharge is imported into maximum discharge flue, and is filtered using ceramic filtration membrane, purification efficiency
Up to 95.5%.Then by purified maximum discharge flue gas through residual neat recovering system recovery waste heat, and by flue-gas temperature control
System is at 118 DEG C.
Embodiment 2
According to the temperature of flue gas, H in different bellows2O (g) content (see Fig. 1) and PM2.5, again/alkali metal concentration of emission
Sintering flue gas is divided into three sections by (see Fig. 2): sintering leading portion is 1#-14#Bellows；Being sintered middle section is 15#-20#Bellows；It is sintered endpiece
It is 21#-24#Bellows.Different phase flue-gas temperature, H2O (g) content and PM2.5, again/alkali metal discharge amount account for total release
Ratio is shown in Table 1.The flue gas for being sintered leading portion, sintering endpiece discharge is imported into low emission flue, and is removed using routine intravenous electric cleaner
Dirt.The flue gas for being sintered middle section discharge is imported into maximum discharge flue, and is filtered using metallic fiber film, purification efficiency is up to
96.8%.Then by purified maximum discharge flue gas through residual neat recovering system recovery waste heat, and flue-gas temperature control is existed
123℃。
Embodiment 3
According to the temperature of flue gas, H in different bellows2O (g) content (see Fig. 1) and PM2.5, again/alkali metal concentration of emission
Sintering flue gas is divided into three sections by (see Fig. 2): sintering leading portion is 1#-14#Bellows；Being sintered middle section is 15#-21#Bellows；It is sintered endpiece
It is 22#-24#Bellows.Different phase flue-gas temperature, H2O (g) content and PM2.5, again/alkali metal discharge amount account for total release
Ratio is shown in Table 1.The flue gas for being sintered leading portion, sintering endpiece discharge is imported into low emission flue, and is removed using routine intravenous electric cleaner
Dirt.The flue gas for being sintered middle section discharge is imported into maximum discharge flue, and is filtered using intermetallic compound film, purification efficiency is up to
98.5%.Then by purified maximum discharge flue gas through residual neat recovering system recovery waste heat, and flue-gas temperature control is existed
130℃。
Table 1 is different sintering stage flue-gas temperatures, H2O (g) content and PM2.5, again/alkali metal discharge ratio
Claims (4)
1. PM in a kind of concentration removing agglomeration for iron mine flue gas2.5Again/alkali metal method, it is characterised in that: including following step
It is rapid:
1) according to PM2.5And the sintering cigarette that heavy metal and alkali metal discharge amount, moisture content and temperature characterisitic generate sintering stage
Gas is divided into leading portion flue gas, middle section flue gas and endpiece flue gas；PM in leading portion flue gas2.5Discharge amount accounts for sintering stage PM2.5Total discharge
Amount 35% or less, heavy metal and alkali metal discharge amount account for sintering stage heavy metal and alkali metal total release 35% or less,
Flue-gas temperature≤100 DEG C and Water Vapor Quality degree >=10%；PM in the flue gas of middle section2.5Discharge amount accounts for sintering stage PM2.5
Total release 55~70%, heavy metal and alkali metal discharge amount account for sintering stage heavy metal and alkali metal total release 60~
75%, flue-gas temperature is 60~450 DEG C, Water Vapor Quality degree is not more than 5%；PM in endpiece flue gas2.5Discharge amount accounts for
Sintering stage PM2.5Total release 10% or less, heavy metal and alkali metal discharge amount accounts for sintering stage heavy metal and alkali metal is total
Discharge amount 10% or less, flue-gas temperature be 350~450 DEG C, Water Vapor Quality degree is less than 5%；
PM in leading portion flue gas, middle section flue gas and endpiece flue gas2.5Content account for sintering stage PM2.5The ratio or a huge sum of money of total release
Belong to and the content of alkali metal accounts for sintering stage heavy metal and the ratio of alkali metal total release is calculated using following formula:
In formula,
I indicates to be sintered each stage；
tiThe duration of expression stage i, unit h；
wiTable PM10Or PM2.5In the concentration of emission of stage i, unit mg/m3；
QiThe flue gas flow of expression stage i, unit m3/h；
BiIndicate PM2.5Or heavy metal and alkali metal account for the percentage of total release, % in the discharge amount of stage i；
2) leading portion flue gas and endpiece flue gas are converged into importing discharge flue I control mixed flue gas temperature and is higher than acid dew-point temperature, warp
After electric precipitator removes dirt, direct emission；
3) middle section flue gas is imported into discharge flue II, after high temperature resistant dust-filtering film dedusting, is recycled into residual neat recovering system
Waste heat.
2. PM in a kind of concentration removing agglomeration for iron mine flue gas according to claim 12.5Again/alkali metal method, it is special
Sign is: the high temperature resistant dust-filtering film includes ceramic filter membrane, intermetallic compound filter membrane, metallic fiber film, glass
Fiber filter film, Teflon filtration film or polyphenylene sulfide overlay film.
3. PM in a kind of described in any item concentration removing agglomeration for iron mine flue gases according to claim 1~22.5Again/alkali metal
Method, it is characterised in that: the acid dew-point temperature is 110 DEG C.
4. PM in a kind of described in any item concentration removing agglomeration for iron mine flue gases according to claim 1~22.5Again/alkali metal
Method, it is characterised in that: the flue-gas temperature after residual neat recovering system heat exchange is 110~130 DEG C.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376921A (en) * | 2008-10-10 | 2009-03-04 | 中南大学 | Sintering gas flue gas sulfuric dioxide decrement discharge technology |
| CN103499216A (en) * | 2013-09-26 | 2014-01-08 | 中南大学 | Iron mine sintering flue gas segmented circulation method |
| CN105091615A (en) * | 2015-08-06 | 2015-11-25 | 中南大学 | Comprehensive treatment method for iron ore sintering smoke pollutants |
| CN106996702A (en) * | 2017-04-17 | 2017-08-01 | 钢研晟华工程技术有限公司 | A kind of agglomeration for iron mine flue gas segmentation enrichment and UTILIZATION OF VESIDUAL HEAT IN emission reduction SOxAnd NOxMethod |
-
2017
- 2017-12-28 CN CN201711457948.XA patent/CN108246021B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376921A (en) * | 2008-10-10 | 2009-03-04 | 中南大学 | Sintering gas flue gas sulfuric dioxide decrement discharge technology |
| CN103499216A (en) * | 2013-09-26 | 2014-01-08 | 中南大学 | Iron mine sintering flue gas segmented circulation method |
| CN105091615A (en) * | 2015-08-06 | 2015-11-25 | 中南大学 | Comprehensive treatment method for iron ore sintering smoke pollutants |
| CN106996702A (en) * | 2017-04-17 | 2017-08-01 | 钢研晟华工程技术有限公司 | A kind of agglomeration for iron mine flue gas segmentation enrichment and UTILIZATION OF VESIDUAL HEAT IN emission reduction SOxAnd NOxMethod |
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| CN108246021A (en) | 2018-07-06 |
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