CN103071359B - A kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas - Google Patents

A kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas Download PDF

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Publication number
CN103071359B
CN103071359B CN201310014025.2A CN201310014025A CN103071359B CN 103071359 B CN103071359 B CN 103071359B CN 201310014025 A CN201310014025 A CN 201310014025A CN 103071359 B CN103071359 B CN 103071359B
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tail gas
acid making
sintering machine
sulfur dioxide
gas
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CN103071359A (en
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李强
孟步祥
李国喜
吕彥强
高长涛
赵宏
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Abstract

The present invention relates to a kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas, method is: <b> I </b>, the tail gas of acid making system, delivers to the entrance of booster fan with carbon steel pipe; <b> II </b> acid making system discharge tail gas together with the tail gas of sintering machine through booster fan pressurization after, then desulfurizer desulfurization is entered, in the adsorption tower of desulfurizer, sulfur dioxide in the tail gas of sintering machine is absorbed, and the SO in the tail gas of acid making system 2separate with other gases, the SO after absorption 2after Analytic Tower, enter acid making system, other gas is discharged from chimney; Relieving haperacidity tail gas after the desulfurization of <b> III </b> acid making system delivers to the entrance of booster fan again with carbon steel pipe, enter desulfurizer desulfurization together with the tail gas of sintering machine.This reduction method of the acid making system discharge sulfur dioxide of sintering machine tail gas, achieves the zero-emission of acid making system sulfur dioxide.

Description

A kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas
Technical field
The present invention relates to a kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas.
Background technology
The method of existing sinter fume Sulphuric acid, adopts active carbon mobile layer desulphurization denitration division dirt technology, this technology collection desulphurization and denitration, dedusting and removal dioxin four technology, desulfuration efficiency reaches 95%, denitration efficiency reaches 40%, and efficiency of dust collection reaches 99.5%, the SO removed 2can the concentrated sulfuric acid be produced, part relieving haperacidity tail gas is discharged to air simultaneously.Although relieving haperacidity exhaust emissions index reaches design standard and national environmental protection index, but still causes serious pollution to the air of surrounding.Strict control tail gas is to the pollution of air, most important to the air quality of environmental protect, 450m 2sO is arranged outside after sintering machine relieving haperacidity 2reach 25 tons/year, new 450m 2sO is arranged outside annual after sintering machine (title of other a set of equipment) relieving haperacidity 2reach 50 tons/year.These harmful substances generate severe contamination to surrounding environment.Due to existing this sulphuric acid plant SO 2conversion ratio do not reach 100%, therefore will inevitably some SO 2do not change into SO 3, be produced into sulfuric acid, therefore had sub-fraction SO 2gas discharging enters air.SO in acid making system tail gas can not be realized 2the target of zero-emission.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for the acid making system discharge sulfur dioxide of existing reduction sintering machine tail gas, the invention provides a kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas, method of the present invention can realize SO in acid making system tail gas 2zero-emission.
Starting point of the present invention is: after sintering machine desulfuration, denitration, dedusting and removal dioxin, mainly contains SO in tail gas containing gas 2, N 2with CO 2.Flue gas structure is comparatively simple, wherein only has SO 2gas can cause severe contamination to air.SO in tail gas 2concentration be 737mg/Nm 3, its concentration meets desulphurization system design objective, SO 2concentration be not more than 815mg/Nm 3, meet the requirement of deacidification system in theory.In addition, on air volumematching, acid making system maximum throughput per hour is 4116m 3, after absorbing, volume-diminished 9.5%, total blast volume is 3726m 3and sinter fume flow per hour is 140 ten thousand steres (entering the gas flow of desulphurization system), the air quantity of 140 ten thousand steres is compared with 3726 cubic metres, and the air quantity of the outer last person's gas of relieving haperacidity is completely negligible, namely very little on the impact increasing fan delivery adjustment.Therefore, outer last person's gas of relieving haperacidity is compared with sinter fume composition, fairly simple, can not cause corrosion to desulphurization plant.
Design of the present invention is:
The tail gas of acid making system, deliver to the entrance of booster fan with the DN325 carbon steel pipe installing automatic pressure regulating valve;
Acid making system discharge tail gas together with the tail gas of sintering machine through booster fan pressurization after, then desulfurizer desulfurization is entered, in the adsorption tower of desulfurizer, absorb the sulfur dioxide in the tail gas of sintering machine, other gas in the tail gas of sintering machine is discharged from chimney; SO 2gas enters acid making system extracting sulfuric acid;
Relieving haperacidity tail gas after acid making system desulfurization delivers to the entrance of booster fan again with carbon steel pipe, enter desulfurizer desulfurization together with the tail gas of sintering machine.
The present invention is directly connected to the entrance of the booster fan of desulphurization system outer last person's feed channel of relieving haperacidity with the carbon steel pipe of DN325, utilize the negative pressure increasing blower fan and produce, in the adsorption tower of desulphurization system, cyclic absorption is carried out (because enter the SO after desulphurization system to the sulfur dioxide in the tail gas of relieving haperacidity 2may not necessarily 100% resolve enter desulphurization system, also likely 100% resolve after enter acid making system, but also may not necessarily 100% change into SO 3generate sulfuric acid, therefore mandatory declaration is here cyclic absorption, after circulation, just can reach SO 2realize the absorption of 100%), the sulfur dioxide gas after absorption, reenters acid making system and carries out secondary conversion, reach the object of cyclic absorption, conversion and cycle like this, realize SO in acid making system tail gas 2the target of zero-emission.
Method of the present invention is:
The tail gas of 1 acid making system, delivers to the entrance of booster fan with the DN325 carbon steel pipe installing automatic pressure regulating valve, this automatic pressure regulating valve regulates the outlet tail gas of two suction towers;
The tail gas of 2 acid making system discharges after booster fan pressurization, then enters desulfurizer desulfurization, in the adsorption tower of desulfurizer, absorbs the sulfur dioxide in the tail gas of sintering machine together with the tail gas of sintering machine, and the SO in the tail gas of acid making system 2separate with other gases, the SO after absorption 2acid making system is entered, other gas mainly N after Analytic Tower 2, CO 2with CO 1discharge from chimney;
Relieving haperacidity tail gas after 3 acid making system desulfurization delivers to the entrance of booster fan again with the DN325 carbon steel pipe installing automatic pressure regulating valve, enter desulfurizer desulfurization together with the tail gas of sintering machine.
The diameter of the DN325 carbon steel pipe of above-mentioned installation automatic pressure regulating valve is generally 300mm.
Because the present invention gets back to again acid making system second adsorption, double absorption outer for relieving haperacidity last person's gas, solve the difficult problem that sintering relieving haperacidity sulfur dioxide discharges outward, achieve relieving haperacidity and arrange tail gas sulphur dioxide zero-emission outward.Avoid the pollution that the environment of sulfur dioxide in tail gas is arranged in relieving haperacidity outward.
Detailed description of the invention
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention to be not limited to following enforcement attached.
embodiment
The present embodiment is at 450m 2sintering desulfuration denitration acid making system is implemented.
After the tail gas desulfurization of sintering machine, denitration, dedusting and removal dioxin, in the tail gas of sintering machine, mainly contain SO containing gas 2, N 2with CO 2.The tail gas SO of sintering machine 2concentration be 730 ± 200mg/Nm 3, the tail gas flow per hour of sintering machine is 140 ± 200,000 m 3, the flow of the tail gas of acid making system is per hour is 3700 ± 300m 3.
The method of the present embodiment is:
The tail gas of 1 acid making system is the entrance that the DN325 carbon steel pipe of the installation automatic pressure regulating valve of 300mm delivers to booster fan with diameter, and this automatic pressure regulating valve regulates two to inhale towers outlet tail gas;
The tail gas of 2 acid making system discharges after booster fan pressurization, then enters desulfurizer desulfurization, in the adsorption tower of desulfurizer, absorbs the sulfur dioxide in the tail gas of sintering machine together with the tail gas of sintering machine, and the SO in the tail gas of acid making system 2separate with other gases, the SO after absorption 2acid making system is entered, other gas mainly N after Analytic Tower 2, CO 2with CO 1discharge from chimney;
Relieving haperacidity tail gas after 3 acid making system desulfurization delivers to the entrance of booster fan again with the carbon steel pipe of diameter 300mm, enter desulfurizer desulfurization together with the tail gas of sintering machine.
The present embodiment circulates from the above-mentioned process of 1,2 and 3 to carry out, cyclic absorption, conversion and cycle.
The present embodiment takes off SO at desulfurizer 2efficiency reaches 95%; Acid making system is to SO 2absorption is had to reach 99.75%, SO in the tail gas of acid making system discharge 2for 0.025%(volume ratio) other is mainly N 2, CO 2, CO 1with steam.

Claims (1)

1. reduce a method for the acid making system discharge sulfur dioxide with sintering machine tail gas, method is:
ithe tail gas of acid making system, deliver to the entrance of booster fan with the DN325 carbon steel pipe installing automatic pressure regulating valve, this automatic pressure regulating valve regulates the outlet tail gas of two suction towers;
iIthe tail gas of acid making system discharge after booster fan pressurization, then enters desulfurizer desulfurization, in the adsorption tower of desulfurizer, absorbs the sulfur dioxide in the tail gas of sintering machine together with the tail gas of sintering machine, and the SO in the tail gas of acid making system 2separate with other gases, the SO after absorption 2after Analytic Tower, enter acid making system, other gas is discharged from chimney;
iIIrelieving haperacidity tail gas after acid making system desulfurization delivers to the entrance of booster fan again with the DN325 carbon steel pipe installing automatic pressure regulating valve, enter desulfurizer desulfurization together with the tail gas of sintering machine.
CN201310014025.2A 2013-01-15 2013-01-15 A kind of method reducing the acid making system discharge sulfur dioxide using sintering machine tail gas Active CN103071359B (en)

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CN107469588A (en) * 2016-06-07 2017-12-15 上海宝钢化工有限公司 SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101492154A (en) * 2009-02-12 2009-07-29 中国瑞林工程技术有限公司 Method for economically recycling sulphur dioxide from low-concentration or non-continuity flue gas to produce sulphuric acid
CN102580455A (en) * 2011-12-29 2012-07-18 山西太钢不锈钢股份有限公司 Sintering smoke treatment system and sintering smoke treatment method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101492154A (en) * 2009-02-12 2009-07-29 中国瑞林工程技术有限公司 Method for economically recycling sulphur dioxide from low-concentration or non-continuity flue gas to produce sulphuric acid
CN102580455A (en) * 2011-12-29 2012-07-18 山西太钢不锈钢股份有限公司 Sintering smoke treatment system and sintering smoke treatment method

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