CN106474905A - A kind of calcining fume desulfurizing and dedusting technology - Google Patents

A kind of calcining fume desulfurizing and dedusting technology Download PDF

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Publication number
CN106474905A
CN106474905A CN201611244410.6A CN201611244410A CN106474905A CN 106474905 A CN106474905 A CN 106474905A CN 201611244410 A CN201611244410 A CN 201611244410A CN 106474905 A CN106474905 A CN 106474905A
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CN
China
Prior art keywords
flue gas
desulfurizing
calcining
desulfurization
agent
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CN201611244410.6A
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Chinese (zh)
Inventor
王复生
班祥
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焦作和信冶金科技有限责任公司
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Priority to CN201611244410.6A priority Critical patent/CN106474905A/en
Publication of CN106474905A publication Critical patent/CN106474905A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/78Liquid phase processes with gas-liquid contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/96Regeneration, reactivation or recycling of reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2067Urea
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/306Alkali metal compounds of potassium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/40Alkaline earth metal or magnesium compounds
    • B01D2251/402Alkaline earth metal or magnesium compounds of magnesium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The invention discloses a kind of calcining fume desulfurizing and dedusting technology, including the step such as out of stock, flue gas cooling, dedusting, sulphur removal, its advantage is:1st, arrange rationally, it is possible to achieve the quick denitration of flue gas, high-efficiency desulfurization and demisting dedusting, shorten flow process, reduce Process configuration.For the high feature of pollutant levels, can effectively remove the SO in flue gas2, nitrogen oxides and dust, realize environment protection standard discharge;2nd, this technique had both been suitable for the desulfurization of newly-built flue gas system, also was adapted for existing cleaning system desulfurizing fly ash;Both it had been suitable for humidity, high temperature area desulfurization, and be also suitable for arid, cold district electrolysis flue gas desulfurization, there is the stronger suitability;3rd, middle additive reusable edible, advantageously reduces cost, and reduces the discharge capacity of garbage.

Description

A kind of calcining fume desulfurizing and dedusting technology

Technical field

The present invention relates to a kind of calcining fume desulfurizing and dedusting technology, belong to environmental protection resist technology and apparatus field.

Background technology

In carbon industry, due to the petroleum coke of high-quality to be obtained, need using calcining furnace or pot type burner high-temperature calcination Method remove fugitive constituent therein, reduce S content and other impurity.So in calcining furnace(Or pot type burner)Outlet can be released Release the flue gas containing higher concentration sulfur dioxide, nitrogen oxides and fugitive constituent dust.According to SO in the general flue gas of calculating2's Concentration is 2000-6500mg/Nm3, nitrous oxides concentration is typically in 150-400 mg/Nm3.

According to《Aluminum i ndustry pollutant emission standard》(GB25465-2010)And promulgate for 2014《Aluminum i ndustry pollutant are arranged Put standard》Amendment is it is desirable in key area by SO2Concentration control in 100 mg/Nm3Hereinafter, nitrous oxides concentration controls 100 mg/Nm3Hereinafter, particulate matter controls in 10 mg/Nm3Below it is therefore desirable to carry out dirt at desulphurization denitration comprehensive to calcining flue gas Conjunction is processed.

Calcining flue gas have exhaust gas volumn little, containing sulphur concentration high, concentration containing nitre is low, particle size is little the features such as, therefore adopt Not only can not effectively remove the various pollutant in flue gas with traditional Limestone-gypsum Wet Flue Gas Desulfurization Process composite technology, and desulfurization System footprint area is big, system operation whole efficiency is relatively low, operating cost is high.It is thus desirable to the feature exploitation for calcining flue gas Go out efficient flue gas desulfurization, denitration, dedusting composite technology.

Content of the invention

In order to overcome drawbacks described above, the invention provides a kind of calcining fume desulfurizing and dedusting technology.

To achieve these goals, the technical scheme is that:A kind of calcining fume desulfurizing and dedusting technology, its feature exists In:Comprise the following steps:

1), spray into denitrfying agent in calcining furnace exhanst gas outlet, be sufficiently mixed with flue gas, carry out denitration process;

2), gas enters cleaner unit after denitration, removes dust;

3), flue gas enters hypergravity rotation desulfurizing tower after chalk dust removing, rotate the desulfurizing agent in desulfurizing tower with hypergravity and adsorbed Reaction, carries out sulphur removal;

4), the flue gas after sulphur removal discharged;

5), step 3)In complete adsorption reaction desulfurizing agent enter neutralization precipitation system, add neutralization reducing agent, produce precipitation and Regeneration solubility alkali liquor, regeneration solubility alkali liquor input hypergravity rotation desulfurizing tower re-starts sulphur removal;Precipitation is through pressure filter pressure Filter is reclaimed after processing.

Further, as a kind of preferred, described step 1)With step 2)Between be provided with flue gas cool-down step, described flue gas fall Warm step is lowered the temperature by smoke temperature reducer, described smoke temperature reducer be waste heat boiler, flue gas heat-exchange unit, water-spraying control, The one or more combination of tube-cooled.

Further, as one kind preferably, described denitrfying agent is the reducing agent containing ammonia or carbamide.

Further, as one kind preferably, described desulfurizing agent is NaOH, Na2CO3、NaHCO3、KaOH、Mg(OH)2One kind Or multiple mixture solution.

Further, as one kind preferably, described neutralization reducing agent is Ca(OH)2、CaO、CaCO3、Mg(OH)、MgCO3One Plant or multiple mixture.

The invention has the beneficial effects as follows:1st, arrange rationally, it is possible to achieve the quick denitration of flue gas, high-efficiency desulfurization and demisting are removed Dirt, shortens flow process, reduces Process configuration.For the high feature of pollutant levels, can effectively remove the SO in flue gas2, nitrogen oxidation Thing and dust, realize environment protection standard discharge;2nd, this technique had both been suitable for the desulfurization of newly-built flue gas system, also is adapted for existing purification and is System desulfurizing fly ash;Both it had been suitable for humidity, high temperature area desulfurization, and be also suitable for arid, cold district electrolysis flue gas desulfurization, have relatively The strong suitability;3rd, middle additive reusable edible, advantageously reduces cost, and reduces the discharge capacity of garbage.

Brief description

Fig. 1 is the process flow diagram of the present invention.

Specific embodiment

Below in conjunction with accompanying drawing, technical scheme is clearly and completely described with the enforcement it is clear that described Example is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill The every other embodiment that personnel are obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.

In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertical ", The orientation of instruction such as " level ", " interior ", " outward " or position relationship are based on orientation shown in the drawings or position relationship, merely to Be easy to describe the present invention and simplify description, rather than instruction or the hint device of indication or element must have specific orientation, With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ", " the 3rd " is only used for describing purpose, and it is not intended that indicating or hint relative importance.

In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected;Can To be to be mechanically connected or electrical connection;Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, Ke Yishi The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.

A kind of calcining fume desulfurizing and dedusting technology it is characterised in that:Comprise the following steps:

1), spray into denitrfying agent in calcining furnace 1 exhanst gas outlet, be sufficiently mixed with flue gas, carry out denitration process, described denitrfying agent be containing There is the reducing agent of ammonia or carbamide;

2), gas enters cleaner unit 4 after denitration, removes dust;

3), flue gas enters hypergravity rotation desulfurizing tower 6 after chalk dust removing, rotate the desulfurizing agent in desulfurizing tower 6 with hypergravity and inhaled Reaction enclosure, carries out sulphur removal, and described desulfurizing agent is NaOH, Na2CO3、NaHCO3、KaOH、Mg(OH)2Mixture solution;

4), the flue gas after sulphur removal discharged;

5), step 3)In complete adsorption reaction desulfurizing agent enter neutralization precipitation system, add neutralization reducing agent, produce precipitation and Regeneration solubility alkali liquor, regeneration solubility alkali liquor input hypergravity rotation desulfurizing tower 6 re-starts sulphur removal;Precipitation is through pressure filter pressure Filter is reclaimed after processing, and described neutralization reducing agent is Ca(OH)2、CaO、CaCO3、Mg(OH)、MgCO3Mixture.

As the improvement of technique scheme, described step 1)With step 2)Between be provided with flue gas cool-down step, described cigarette Gas cooling step is lowered the temperature by smoke temperature reducer, and described smoke temperature reducer is waste heat boiler, flue gas heat-exchange unit, water spray are cold But, the one or more combination of tube-cooled.

In actual applications, the process flow diagram of the present invention as shown in Figure 1, including denitration section, dedusting section, Desulfurization section, absorbing liquid processing section, water tank 20, filter-pressing device and smoke extractor 19, described denitration section includes denitrfying agent bunker 16, takes off Nitre agent dosage bunker 17 and denitrfying agent reflux pump 18, for carrying out denitration to smoke inlet injection denitrfying agent;Dedusting section includes dedusting Device 4, for removing chalk dust removing;Described desulfurization section includes hypergravity rotation desulfurizing tower 6 and demister 7, for carrying out desulfurization to flue gas; Described absorbing liquid processing section includes neutralization precipitation pond 9, regulating reservoir 10, clarified filter tank 11 and the depositing reservoir 12 being sequentially connected, and uses Medicament used by desulfurization section is precipitated, adjusted and recycled;Described water tank 20 passes through water pump to denitrfying agent dosage bunker 17 Supply water with clarified filter tank 11;Described filter-pressing device includes pressure filter 14, for carrying out to the sediment slurry of absorbing liquid processing section Filter pressing, filter pressing backwater passes through pipeline to neutralization precipitation pond 9, and described smoke extractor 19 is used for discharging last flue gas.

For heat energy in effectively utilizes calcining flue gas, waste heat boiler 2 can be set between denitration section and dedusting section.

Because the flue gas after desulfurization contains wetly, therefore by the high temperature fluid pipeline of flue gas heat-exchange unit 3 and denitration Duan Lian Connect, the outlet of cryogenic fluid conduit and desulfurization section is connected, to make high temperature calcine flue gas to heat the flue gas after desulfurization, and effectively Reduction calcine the temperature of flue gas, the backwater of described flue gas heat-exchange unit 3 is connected with neutralization precipitation pond, described flue gas heat-exchange unit 3 The air vent of cryogenic fluid conduit is communicated with smoke extractor by air-introduced machine 5.

In addition can arrange water drench cooling tower further the calcining flue gas of high temperature is cooled down, facilitate follow-up dedusting and Desulfurization.

Another kind of form of practical application, as shown in figure 1, flue gas is from pot type outlet of still(Rotary kiln or boiler)1 discharge, High-temperature flue gas region sprays into denitrfying agent.Denitrfying agent bunker first, in denitrfying agent bunker 16, stirs in denitrfying agent dosage bunker 17, fixed That measures is added in high-temperature flue gas.High-temperature flue gas are through waste heat boiler 2(Evaporation boiler or hot coal thermo oil boiler)Pass through again after cooling Flue gas heat-exchange unit 3, flue-gas temperature reduces further.Flue gas sack cleaner/cyclone dust extractor 4 after cooling, removes therein Dust.In order to ensure that temperature is reduced to suitable degree, equipment water jetting cooler can be set after flue gas heat-exchange unit 3.From dedusting Device 4 flue gas out enters air-introduced machine 5, and after air-introduced machine, flue gas enters hypergravity rotation desulfurization 6 tower and removes in flue gas two Sulfur oxide and remaining dust.From hypergravity rotation desulfurizing tower 6 flue gas out through demister 7(Or demister is revolved with hypergravity Turn desulfurizing tower to be integrated), from demister 7 flue gas out again through flue gas heat-exchange unit 3, enter greatly through smoke extractor 19 after heating Gas.

Pass through inflow neutralization precipitation pond 9 from what hypergravity rotation desulfurizing tower 6 was discharged containing acid, containing alkali salt, in neutralization precipitation pond 9 Middle add from lye tank (vat) 8 come alkaline matter be neutralized, add further in regulating reservoir 10 alkali liquor adjustment pH value, Filter in clarified filter tank 11, enter depositing reservoir 12 through screen cloth 13, the alkali liquor in depositing reservoir 12 is transported to through water pump overweight Power rotation desulfurizing tower 6 completes desulfurization and dedusting reaction.

Neutralization precipitation pond 9, regulating reservoir 10, the serosity in clarified filter tank 11 are transported in pressure filter 14 through water pump 21. Through pipeline in neutralization precipitation pond 9, filter cake is transported in storage slag case 15 aqueous solution after filter pressing, regular export trade or fill out Bury.The water returning from flue gas heat-exchange unit 3, demister 7 is also transported in neutralization precipitation pond 9.

Technical scheme is not limited to the restriction of above-mentioned specific embodiment, and every technology according to the present invention scheme is done The technology deformation going out, each falls within protection scope of the present invention.

Claims (5)

1. a kind of calcining fume desulfurizing and dedusting technology it is characterised in that:Comprise the following steps:
1), spray into denitrfying agent in calcining furnace exhanst gas outlet, be sufficiently mixed with flue gas, carry out denitration process;
2), gas enters cleaner unit after denitration, removes dust;
3), flue gas enters hypergravity rotation desulfurizing tower after chalk dust removing, rotate the desulfurizing agent in desulfurizing tower with hypergravity and adsorbed Reaction, carries out sulphur removal;
4), the flue gas after sulphur removal discharged;
5), step 3)In complete adsorption reaction desulfurizing agent enter neutralization precipitation system, add neutralization reducing agent, produce precipitation and Regeneration solubility alkali liquor, regeneration solubility alkali liquor input hypergravity rotation desulfurizing tower re-starts sulphur removal;Precipitation is through pressure filter pressure Filter is reclaimed after processing.
2. calcining fume desulfurizing and dedusting technology described in 1 to be gone according to right it is characterised in that:Described step 1)With step 2)It Between be provided with flue gas cool-down step, described flue gas cool-down step is lowered the temperature by smoke temperature reducer, and described smoke temperature reducer is Waste heat boiler, flue gas heat-exchange unit, water-spraying control, the one or more combination of tube-cooled.
3. according to claim 1 calcining fume desulfurizing and dedusting technology it is characterised in that:Described denitrfying agent be containing ammonia or The reducing agent of carbamide.
4. according to claim 1 calcining fume desulfurizing and dedusting technology it is characterised in that:Described desulfurizing agent be NaOH, Na2CO3、NaHCO3、KaOH、Mg(OH)2One or more mixture solution.
5. according to claim 1 calcining fume desulfurizing and dedusting technology it is characterised in that:Described neutralization reducing agent is Ca (OH)2、CaO、CaCO3、Mg(OH)、MgCO3One or more mixture.
CN201611244410.6A 2016-12-29 2016-12-29 A kind of calcining fume desulfurizing and dedusting technology CN106474905A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102974181A (en) * 2012-11-14 2013-03-20 江苏中显集团有限公司 Flue gas dedusting and desulfurization and denitrification craft and special device thereof
CN103432877A (en) * 2013-09-06 2013-12-11 余国贤 Integrated method for wet-process dust removal, desulfurization, denitrification demercuration, dearsenification of complexing ferroporphyrin smoke based on supergravity
EP2959959A1 (en) * 2013-02-25 2015-12-30 Mitsubishi Hitachi Power Systems, Ltd. Exhaust gas treatment system and exhaust gas treatment method
CN105194990A (en) * 2015-10-14 2015-12-30 中国华能集团清洁能源技术研究院有限公司 Flue gas comprehensive management system applicable to coke refining oven
CN105944536A (en) * 2016-05-12 2016-09-21 中冶华天工程技术有限公司 Coke oven flue gas desulfurization technology and system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102974181A (en) * 2012-11-14 2013-03-20 江苏中显集团有限公司 Flue gas dedusting and desulfurization and denitrification craft and special device thereof
EP2959959A1 (en) * 2013-02-25 2015-12-30 Mitsubishi Hitachi Power Systems, Ltd. Exhaust gas treatment system and exhaust gas treatment method
CN103432877A (en) * 2013-09-06 2013-12-11 余国贤 Integrated method for wet-process dust removal, desulfurization, denitrification demercuration, dearsenification of complexing ferroporphyrin smoke based on supergravity
CN105194990A (en) * 2015-10-14 2015-12-30 中国华能集团清洁能源技术研究院有限公司 Flue gas comprehensive management system applicable to coke refining oven
CN105944536A (en) * 2016-05-12 2016-09-21 中冶华天工程技术有限公司 Coke oven flue gas desulfurization technology and system

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