CN201302374Y - Selective desulfurization device for flue gas of sintering machine head - Google Patents

Selective desulfurization device for flue gas of sintering machine head Download PDF

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Publication number
CN201302374Y
CN201302374Y CNU200820146133XU CN200820146133U CN201302374Y CN 201302374 Y CN201302374 Y CN 201302374Y CN U200820146133X U CNU200820146133X U CN U200820146133XU CN 200820146133 U CN200820146133 U CN 200820146133U CN 201302374 Y CN201302374 Y CN 201302374Y
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China
Prior art keywords
flue
valve
pipeline
windscreen
flue gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNU200820146133XU
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Chinese (zh)
Inventor
欧阳元和
陈冠群
林金柱
林建军
梁伯平
江荣才
余志杰
陈深灿
郭光章
赖毅强
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Fujian Sangang Minguang Co Ltd
Fujian Sangang Group Co Ltd
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Fujian Sangang Minguang Co Ltd
Fujian Sangang Group Co Ltd
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Priority to CNU200820146133XU priority Critical patent/CN201302374Y/en
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Publication of CN201302374Y publication Critical patent/CN201302374Y/en
Anticipated expiration legal-status Critical
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Abstract

A selective desulfurization device for flue gas of a sintering machine head relates to a desulfurization device used in a sintering machine. The selective desulfurization device comprises wind boxes of the sintering machine head, a flue duct, an electric precipitator, an exhaust blower, the desulfurization device, a wind screen valve and a pipeline, and is characterized in that the wind boxes for low-sulfur flue gas at the head part of the sintering machine head and at the tail part thereof are connected into a flue duct of a machine head and a flue duct of a machine tail through the pipelines respectively, a high-sulfur wind box at the middle part of the machine is connected into a flue duct in the middle of the machine through the pipeline, the flue duct of the machine head and the flue duct of the machine tail are connected into an A# electric precipitator through a three-way connector, and an outlet of the electric precipitator is communicated with an A# exhaust blower, the directly connected wind screen valve and a chimney pipe in sequence; the flue duct in the middle of the machine is connected with a B# electric precipitator, a B# exhaust blower, an inlet wind screen valve, the desulfurization device, an outlet wind screen valve and the chimney pipe in sequence, and an outlet pipeline of the B# exhaust blower is also connected with a bypass wind screen valve and the chimney pipeline in sequence. The selective desulfurization device has the advantages of low desulfurization cost with double flue ducts and high desulfurization efficiency.

Description

Sintering machine head end flue gas selective desulfurization device
Technical field:
The utility model relates to the desulfurizer that uses on the sintering machine.
Background technology:
Fujian Sanguang Minguang Share Co., Ltd. calls for response national environmental protection " energy-saving and emission-reduction " and according to the needs of self-growth, at a newly-built 180m 2Supporting flue gas desulfur device on the sintering machine carries out desulfurization to the head flue gas of sintering machine and handles.
Because sulfur content is higher in the sintering crude fuel, a large amount of SO that produce in sintering production process 2If all outer being discharged in the atmosphere very easily forms the acid rain contaminated environment.The head flue gas of sintering machine is because the operating mode complexity, variations in temperature and flue gas flow change all very greatly, it is carried out desulfurization still belong to development at home, though there are extremely indivedual producers to drop on probation, but basically all can't stable operation, desulfuration efficiency is not high, and equipment failure rate is higher, and therefore also not having ripe experience can be for using for reference.
Up to the present, be applied to sintering flue gas desulfurization technology and mainly contain three kinds of close coherent method, circulating fluidized bed dry and wet methods, main because the system complex of wet desulfurizing process, corrosivity are serious, accessory substance is difficult to handle and has secondary pollution and problem such as involve great expense, and seldom use at present.Close coherent method has overcome the shortcoming of wet desulphurization, but because the structure more complicated, fault rate is higher, also is not very ripe.And flue gas circulating fluidized bed dry desulfurization because simple in structure, therefore fault rate is low, than the desulfurization that is more suitable for the sintering machine head end flue gas.
Because the SO in the sintering process in the different phase flue gas 2The content difference, and differ more than ten times, desulfurization is generally all passed through with all sinter fumes by steel plant at present, each bellows that is about to sintering machine connect large flue of feeding with pipeline, insert deduster again, the deduster other end is installed air exhauster, and air exhauster enters desulfurizer through the windscreen valve again, and the desulfurizer outlet inserts the windscreen valve and then feeds chimney to airborne release.Because SO in the flue gas 2Mean concentration is lower, and not only desulfuration efficiency is low, and cost and operating cost is all than higher, and this is very uneconomic.Therefore, we have proposed sinter fume is carried out selective desulfurization, can improve desulfuration efficiency, reduce operating cost, can reduce investment significantly again, make desulfur technology be achieved in the application of sintering, have filled up a domestic blank.
Summary of the invention:
The purpose of this utility model be to provide a kind of simply, sintering machine head end flue gas selective desulfurization device efficiently.
Scheme of the present utility model is: its structure comprises bellows, flue, electric cleaner, air exhauster, desulfurizer, windscreen valve, the pipeline of sintering machine head end, each bellows that it is characterized in that head, the afterbody low-sulfur flue gas of sintering machine head end insert the bellows of high-sulfur at head flue and tail flue, machine middle part respectively by flue in the pipeline access machine by pipeline, tail flue and tail flue insert the A# electric cleaner by three-way connection, and the electric cleaner outlet is communicated with A# air exhauster, direct-connected windscreen valve, chimney breast successively; Flue is connected with B# electric cleaner, B# air exhauster, import windscreen valve, desulfurizer, outlet windscreen valve, chimney breast successively in the machine, and B# air exhauster outlet conduit also is connected with bypass windscreen valve, chimney breast successively.
The utility model has the advantages that: one, adopt the twin flue selective desulfurization, have only 60% air quantity to carry out desulfurization, small investment, operating cost is low, and because of containing the sulphur concentration height, the efficient of desulfurization is also higher, can reach more than 95%; Simultaneously, adopt twin flue segmentation exhausting, sintering process is had active influence, facts have proved that the usage factor of sintering increases; Two, adopt the circulating sulfuration bed desulfurization technique, a large amount of desulfurizing agent (comprising circulating ash) enters desulfurizing tower by the below of desulfurizing tower, and it is convenient to carry, and realizes that easily the strength of big flow is carried; Three, the conveying of quick lime, calcium hydroxide and final products desulfurization ash all adopts strength to carry, and a large amount of circulating ash adopts air flume to carry, and simple in structure, fault rate is low, does not have the secondary pollution problem; Four, gas solid separation adopts sack cleaner, and adopts rotary action of low-voltage pulse soot blower, good dedusting effect, the long service life of cloth bag; Five, adopt special making-up air device, can overcome the sulfuration bed that causes when fluctuating in a big way and change, influence desulfuration efficiency because of sinter fume; Six, adopt sealing gland formula windscreen valve, when desulfurizer need be shut down for some reason, can effectively stop and contain SO 2Flue gas enter desulfurizer, prevent SO 2Produce strong acid etching system facility with the condensed water reaction; Seven, adopt three grades of special burnt lime digesters, digest effectively, do not have secondary pollution; Eight, adopt special-purpose atomized water spray gun, atomizing effect is good; Nine, adopt the segmentation desulfur technology, sintering machine middle part and the independent separately exhausting of portion end to end can be regulated negative pressure and air quantity separately according to the sintering situation, and minimizing is leaked out, and wind utilization ratio height helps improving production capacity, reduces to consume.
Description of drawings:
The structural representation of accompanying drawing the utility model twin flue technical scheme.
The specific embodiment:
Structure of the present utility model comprises the bellows of sintering machine head end, flue, electric cleaner, air exhauster, desulfurizer (2), the windscreen valve, pipeline, the head that it is characterized in that sintering machine head end, each bellows of afterbody low-sulfur flue gas insert head flue (3) and tail flue (5) respectively by pipeline, the bellows of the high-sulfur at machine middle part are by flue (4) in the pipeline access machine, tail flue (5) and tail flue (5) insert A# electric cleaner (7) by three-way connection, the electric cleaner outlet successively with A# air exhauster (9), direct-connected windscreen valve (10), chimney (1) pipeline is communicated with; Flue in the machine (4) is connected with B# electric cleaner (6), B# air exhauster (8), import windscreen valve (12), desulfurizer (2), outlet windscreen valve (14), chimney (1) pipeline successively, and B# air exhauster (8) outlet conduit also is connected with bypass windscreen valve (11), chimney (1) pipeline successively.
Dock a circulation windscreen valve (13) at desulfurizer (2) with importing and exporting between two pipelines that the windscreen valve is communicated with.
According to the characteristics of sintering process, at initial stage of sintering, because temperature is lower, SO in the flue gas 2Concentration is very low; At sintering machine middle part, SO in the flue gas 2Concentration sharply raises, and is more than ten times of sintering machine head; At sintering machine afterbody, SO 2Concentration sharply reduces.Therefore, sintering machine middle part flue gas drawn by special flue gas system carry out desulfurization, row is to atmosphere after dedusting; And the flue gas of sintering machine head end afterbody is because of SO 2Concentration is very low, can meet discharging standards, directly arranges to atmosphere after dedusting by another flue gas system.
Non-desulfurization flue gas system: be pooled to a large flue from the sinter fume of first to fourth, the ten four, ten No. five bellows (amounting to six bellows) of sintering machine, by special main exhauster exhausting, through behind the electric precipitation by chimney (1) row to atmosphere.This part air quantity accounts for 40% of total blast volume, SO 2Concentration is at 300mg/Nm 3About.
Desulfurization flue gas system: be pooled to another large flue from the sinter fume of the 5th to the ten No. three bellows of sintering machine (amounting to nine bellows), by special main exhauster exhausting, enter desulfurizer (2) through behind the electric precipitation, return chimney (1) by desulfurization air inducing power traction behind desulfurization and bag-type dust, row is to atmosphere.This part air quantity accounts for 60% of total blast volume, SO 2Concentration is at 3000-5000mg/Nm 3
Desulfurizer (2): flue gas enters from the bottom, absorption tower by the control of sealing gland formula windscreen valve, reacts with the absorbent (calcium hydroxide), circulating ash (returning the absorption tower by the circulation skewed slot) and the water that add after Venturi tube is quickened, and removes the SO in the flue gas X, HCl, HF, CO 2Deng gas.Absorbent of carrying secretly in the flue gas and circulating ash, when passing through the Venturi tube of bottom, absorption tower, be subjected to the acceleration of air-flow and suspend, form fierce turbulence state, make between particle and the flue gas and have very big relative landing speed, the particle reaction interface constantly rubs, collides, and a series of chemical reaction takes place.Simultaneously in order to reach best reaction temperature, the atomizer by special use makes flue-gas temperature be cooled to above about 20 ℃ of dew-point temperature to absorption tower internal spraying water.The flue gas that carries a large amount of absorbents, adsorbent and product is advanced into the desulfurization sack cleaner downwards from the absorption tower top side, carries out gas solid separation, and the dust content after gas solid separation is no more than 30mg/Nm 3, clean flue gas is discharged into atmosphere by chimney (1).The conveying of the quick lime in the system, calcium hydroxide and final products desulfurization ash all adopts strength to carry, and circulating ash adopts air flume to carry, so whole system is succinctly reliable.Simultaneously, because flue gas flow and unstable in the sintering process, excursion is big, so is provided with cold air making-up air device (temperature controlling range: 150 ℃~170 ℃) in the system, with the height of stable sulfuration bed, has guaranteed the stable operation of desulfurizer (2).
The utility model is divided into two parts:
The one, the shunting of large flue flue gas.The twin flue system that employing varies in size, article two, large flue is arranged on the same axis, be equivalent to a large flue is divided into three sections that are separated by, two sections are adopted communicating pipe to be communicated with end to end, sintering machine head end 1#--4# bellows, tail 14#-15# amount to six bellows and are pooled to section large flue (1# large flue) end to end respectively, adopt independent electric cleaner, main exhauster that this part sinter fume is directly introduced chimney (1) row to atmosphere.Sintering machine middle part 5#--13# amounts to nine bellows and is pooled to the interlude large flue; (2# large flue); adopt independent electric cleaner, main exhauster that this part sinter fume is directly introduced chimney (1) desulfurization island; and be provided with a bypass windscreen valve; when desulfurizer (2) need be shut down for some reason; can open bypass windscreen valve, flue gas just directly inserts chimney (1) row to atmosphere.
The 2nd, the desulfurization of sulfur-containing smoke gas.On the flue of turnover desulfurizer (2), respectively be provided with a sealing gland formula windscreen valve and a tonifying Qi windscreen valve; when desulfurizer (2) need be shut down for some reason; just close and import and export two windscreen valves, prevent that sulfur-containing smoke gas from entering desulfurizer (2), corrosion desulfurizer (2) facility.Sintered flue gas desulfurization device (2) by absorbent and adsorbent supply system, desulfurizing tower, material recirculation, fresh water (FW) system, desulfurization after deduster and blind controller system etc. form.Sulfur-containing smoke gas is entered by the desulfurizing tower lower end, and the desulfurizing tower lower end is provided with Venturi tube, is used to quicken flue gas, so that set up fluid bed; The desulfurizing tower lower end also is provided with desulfurizing agent and adds inlet and water atomizing nozzle, and atomized water is used to reduce flue-gas temperature, makes it to be controlled at above about 20 ℃ of dew-point temperature, reaches best reaction temperature; The adsorbent supply system is made up of Pneumatic conveying pipeline, quick lime storehouse, calcium hydroxide storehouse, electronic scale, digester, dispenser etc.; The desulfurizing tower bottom is provided with conveying worm and Double-deck cinder discharge valve, is used to get rid of the material that settles down; Deduster after the desulfurization adopts the sack cleaner of waterproof anti-corrosion, and is provided with rotary low pressure reverse gas cleaning device, regularly purges cloth bag, guarantees the operate as normal of cloth bag; Deduster below ash bucket is provided with sulfuration dish and air flume, Pneumatic conveying pipeline, the component material recirculating system, send the most of desulfurizing agent that does not also have complete reaction back to desulfurizing tower by air flume and participate in desulphurization reaction again, another fraction is then delivered to desulfurization ash storehouse by Pneumatic conveying pipeline and is effluxed; Be provided with the desulfurization air-introduced machine in the deduster outlet, be used to overcome the pressure loss of whole desulfurizer (2); Desulfurizer (2) also is provided with cleaning flue gases recirculation, when load reduces less than fully loaded 70%, ON cycle windscreen valve, can utilize the cleaning flue gases behind the air-introduced machine negative pressure on absorption tower to introduce the absorption tower, when changing for different load, system guarantees that the exhaust gas volumn in the absorption tower does not change, thereby can guarantee the constant and maintenance high desulfurization rate of material bed in the absorption tower, this is the distinguishing feature that native system adapts to load variations and keeps high desulfurization rate; Control system then is provided with temperature control, bed pressure drop control and three control loops of acidic materials concentration of emission control.

Claims (2)

1, sintering machine head end flue gas selective desulfurization device, the bellows that comprise sintering machine head end, flue, electric cleaner, air exhauster, desulfurizer (2), the windscreen valve, pipeline, the head that it is characterized in that sintering machine head end, each bellows of afterbody low-sulfur flue gas insert head flue (3) and tail flue (5) respectively by pipeline, the bellows of the high-sulfur at machine middle part are by flue (4) in the pipeline access machine, tail flue (5) and tail flue (5) insert A# electric cleaner (7) by three-way connection, the electric cleaner outlet successively with A# air exhauster (9), direct-connected windscreen valve (10), chimney (1) pipeline is communicated with; Flue in the machine (4) is connected with B# electric cleaner (6), B# air exhauster (8), import windscreen valve (12), desulfurizer (2), outlet windscreen valve (14), chimney (1) pipeline successively, and B# air exhauster (8) outlet conduit also is connected with bypass windscreen valve (11), chimney (1) pipeline successively.
2, sintering machine head end flue gas selective desulfurization device according to claim 1 is characterized in that docking a circulation windscreen valve (13) at desulfurizer (2) with importing and exporting between two pipelines that the windscreen valve is communicated with.
CNU200820146133XU 2008-11-04 2008-11-04 Selective desulfurization device for flue gas of sintering machine head Expired - Fee Related CN201302374Y (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101963459A (en) * 2010-09-02 2011-02-02 宝钢工程技术集团有限公司 Corrosion decelerating system for wet desulphurization chimney of sintering machine
CN102003886A (en) * 2010-11-05 2011-04-06 浙江菲达脱硫工程有限公司 Sintering machine flue gas separation conduction type desulfurizing device and method
CN102022914A (en) * 2010-12-08 2011-04-20 江阴兴澄特种钢铁有限公司 Self-cyclic utilization device for sinter machine tail smoke and tail wind box smoke
CN105841499A (en) * 2014-11-28 2016-08-10 中国钢铁股份有限公司 Exhaust air treating system
CN107198961A (en) * 2017-06-13 2017-09-26 武汉钢铁有限公司 Sinter flue dust sub-prime residual heat recovery and denitration coupling process
CN113124685A (en) * 2021-04-19 2021-07-16 中冶长天国际工程有限责任公司 Method and system for controlling HCl emission by sintering source

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101963459A (en) * 2010-09-02 2011-02-02 宝钢工程技术集团有限公司 Corrosion decelerating system for wet desulphurization chimney of sintering machine
CN102003886A (en) * 2010-11-05 2011-04-06 浙江菲达脱硫工程有限公司 Sintering machine flue gas separation conduction type desulfurizing device and method
CN102022914A (en) * 2010-12-08 2011-04-20 江阴兴澄特种钢铁有限公司 Self-cyclic utilization device for sinter machine tail smoke and tail wind box smoke
CN105841499A (en) * 2014-11-28 2016-08-10 中国钢铁股份有限公司 Exhaust air treating system
CN107198961A (en) * 2017-06-13 2017-09-26 武汉钢铁有限公司 Sinter flue dust sub-prime residual heat recovery and denitration coupling process
CN107198961B (en) * 2017-06-13 2020-06-02 武汉钢铁有限公司 Sintering smoke quality-based waste heat recycling and denitration coupling process
CN113124685A (en) * 2021-04-19 2021-07-16 中冶长天国际工程有限责任公司 Method and system for controlling HCl emission by sintering source

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Granted publication date: 20090902

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