CN102974181A - Flue gas dedusting and desulfurization and denitrification craft and special device thereof - Google Patents

Flue gas dedusting and desulfurization and denitrification craft and special device thereof Download PDF

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Publication number
CN102974181A
CN102974181A CN2012104545253A CN201210454525A CN102974181A CN 102974181 A CN102974181 A CN 102974181A CN 2012104545253 A CN2012104545253 A CN 2012104545253A CN 201210454525 A CN201210454525 A CN 201210454525A CN 102974181 A CN102974181 A CN 102974181A
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flue
eddy flow
flue gas
gas
hypergravity
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CN2012104545253A
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Chinese (zh)
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袁长胜
程晓辉
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江苏中显集团有限公司
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Publication of CN102974181A publication Critical patent/CN102974181A/en

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Abstract

The invention discloses a flue gas dedusting, desulfurization and denitrification craft and a special device of the flue gas dedusting, desulfurization and denitrification craft. A mixed glass fiber ceramic bag with double coatings or a polytetrafluoroethylene bag with the double coatings is utilized to dedust. An ultra-gravity bed or a static cyclone is used as an absorbing and washing reactor. A compulsory oxidation and alkali washing manner is adopted by a comprehensive flue gas processing craft for the desulfurization and the denitrification. A dirt catcher is high in dust removal rate, and is high-temperature resisting, and temperature fluctuation in a large scale is resisted. Ultra-fine powder can be removed. According to the ultra-gravity bed as the reactor, reaction and absorbing strength and absorbing efficiency can be greatly improved, and at the same time, size and investment of equipment can be greatly reduced. Modularization combined installation is achieved, occupied space is greatly reduced, and manufacture and installing procedure is easy, fast and convenient.

Description

A kind of flue-gas dust-removing and desulfurization denitrating technique and special equipment thereof

Technical field

The invention belongs to dust-removal and desulfurizing denitration technology field, be specifically related to a kind of flue-gas dust-removing and desulfurization denitrating technique and special equipment thereof.

Background technology

The equipment of removing or collect solid-state or liquid particle from gas is called dust arrester, can be divided into wet dust separater and dry dust removal apparatus; Can be divided into by the separation principle classification: gravitational dust collecting device (mechanical type dust arrester), inertia force dust arrester (mechanical type dust arrester), centrifugal force dust arrester (mechanical type dust arrester), washing type dust arrester, filtering dust-arrester, electric dust collector.Use at present maximum have electric cleaner, sack cleaner, cyclone dust collectors etc., Electric Scrubber Efficiency can reach 97%, and cyclone dust collectors can reach 84.2%, and sack cleaner can reach 99.7%.The efficiency of dust collection of sack cleaner is the highest from this.

Flue gas desulfurization refers to remove the sulfur dioxide in the flue gas, and fume desulphurization method has kind more than 100 at present, can industrializedly also have tens kinds.Can be divided into wet method, semidry method and dry method by removing the wet form of doing of product, their desulfurization degree is not less than 80%, and respectively length is arranged.Wherein typical wet type process has: 1) limestone/lime-gypsum method; 2) ammonia process; 3) two alkaline process; 4) magnesium oxide method; 5) sodium sulfite absorption cycle (W-L method); 6) Citrate Buffer; 7) ammonium phosphate compound fertilizer method (PAFP); 8) sea water desulfuration etc.The dry type process has: 1) in-furnace calcium spraying afterbody humidification activation method (LIFAC method); 2) charged dry sorbent injection doctor treatment (CDSI); 3) in-furnace calcium spraying circulating fluid bed reactor technology etc.The half dry type process has: 1) rotary spraying and drying method (SDA) method; 2) recirculating fluidized bed (CFB) flue gas desulfurization technique etc.

Denitrating flue gas refers to remove the nitrogen oxide (NOx) in the flue gas, the improvement of NOx gas is normal adopt NH arranged 3Reducing process, CO reducing process and H 2Reducing process.In recent years, two kinds of technology commonly used of NO_x removal are direct catalytic decomposition NOx and hydrocarbon Selective Catalytic Reduction of NO x, and the latter is better than the former.Typical NH 3The reducing process process comprises: 1) selective catalytic reduction (SCR method); 2) on-catalytic selective reduction (SNCR method).And use the typical method of oxidation to have: 1) ozone oxidation absorption process; 2) potassium permanganate KMnO 4The liquid phase oxidation absorption process.

The combined desulfurization denitride technology becomes one of developing direction that fuel gas administers, and can develop any more at present 60 kinds, the industrialization that wherein has, and what have also is in pilot scale and lab scale stage.According to the formation stages of flue gas, flue gas combined desulfurization denitride technology after desulfurization removing nitric technology and burning when can be divided in the stove combustion process.Desulfurization removing nitric technology in the time of in the stove combustion process is the generation that reduces NOx by the control combustion temperature, utilizes simultaneously calcium enhancer to absorb the SO that produces in the combustion process 2, control simultaneously SO to reach 2Purpose with the NOx discharging.Its representative art has: 1) CFBC (CFBC); 2) lime stone injects sectional combustion (LIMB) in the stove; 3) lime stone/urea-spray method; 4) sodium matter sorbent injection method; 5) gas second-time burning sorbent injection technique; 6) spray into organic acid absorbent technique in the stove.General 70% to 80%, the denitrification percent 50% to 70% of the desulfurization degree of these technology.

The flue gas combined desulfurization denitride technology grows up in flue gas desulfurization technique (FGD) technical foundation after the burning, and it can reduce system complexity, better runnability and low cost.Desulfurization degree is more than 90% simultaneously, and denitrification percent is more than 80%.Its representative art comprises: 1) active carbon adsorption; 2) CuO method; 3) NOXSO technique (sodium carbonate/aluminium oxide dry type absorption regeneration); 4) SNAP method; 5) SNOX (WSA-SNOX) technique; 6) SNRB (SOX-BOX) technique; 7) Parsons method; 8) electron beam irradiation method (EBA method); 9) wet type desulfurizing adds metal chelating and thing denitrogenation; 10) strong oxidizer/alkali technique (such as the EDV technology of Belco Technologies company exploitation); 11) heteropoly acid (molybdenum silicic acid) absorption process etc.The first eight kind method is the dry type process, and they exist complex process, cost of investment height and the high deficiency of operation energy consumption to some extent.Rear three kinds is the wet type process, exists the not enough problem of equipment corrosion, liquid waste processing difficulty.

Domestic is digestion and absorption to foreign technology mostly concentrating on the desulfurization aspect aspect the processing coal-fired flue-gas substantially, and denitrogenation research is less separately; This invention is a kind of new dedusting combined desulfurization and denitrification process of releasing summing up at present domestic and international advanced technologies basis, is particularly suitable for the purified treatment of regeneration fume from catalytic cracking and power-plant flue gas.

Summary of the invention

Goal of the invention: for the deficiencies in the prior art, the purpose of this invention is to provide a kind of flue-gas dust-removing and desulfurization denitrating technique, flue gas is at first through the heat exchange UTILIZATION OF VESIDUAL HEAT IN, reduce flue-gas temperature, go again bag-type dust to remove the trickle flue dust in the flue gas, can satisfy multiple flue gas processing requirements, especially be fit to catalytic cracked regenerated generation high temperature, contain the flue gas of ultrafine dust.Another object of the present invention provides a kind of special equipment of flue-gas dust-removing and desulfurization denitrating technique.

Technical scheme: for achieving the above object, the technical solution used in the present invention is as follows:

A kind of flue-gas dust-removing and desulfurization denitrating technique comprises:

(1) flue gas at first enters waste heat using device and carries out heat exchange cooling, and flue-gas temperature is down to about 150~180 ℃, and the flue gas after the cooling enters sack cleaner, to the dust separation in the flue gas, makes kind of dust be reduced to 30mg/m 3

(2) in flue gas, add strong oxidizer again, flue gas after the oxidation enters into the two hypergravity beds of eddy flow or static cyclone, or oxidation in the two hypergravity beds of eddy flow or batch reactor, alkali lye kickback under the two Elevated Gravities of eddy flow with spray, absorb nitrogen oxide and oxysulfide in the flue gas, generate the rich solution that contains nitrate, nitrite, sulfate, sulphite;

(3) rich solution from diffluence circulation fluid groove, is sent into circulated sprinkling in the two hypergravity beds of eddy flow or the static cyclone by the recycle liquid pump pressurization from the two hypergravity beds of eddy flow again;

(4) flue gas after the two hypergravity beds of eddy flow or the washing of static cyclone except being clean flue gas after the demist of PM2.5 device, removes the chimney qualified discharge through demist.

Wherein, the concentration of nitric acid acid, nitrite, sulfate, sulphite raises in the rich solution, the discharge unit waste liquid is to oxidation trough, simultaneously in oxidation trough, blast compressed air, make the waste liquid oxidation in the oxidation trough, generate nitrate and sulfate, reduce the COD value of waste liquid, send to sewage disposal system by waste drains pump again.

Wherein, in system, add the new alkali of joining the preparation of alkali groove by the control of the pH value in the circulation liquid bath, to satisfy the required alkali lye amount of system's operation.

Described strong oxidizer is ozone, clorox, sodium chlorite, hydrogen peroxide or other strong oxidizers and mixes strong oxidizer.

Described alkali lye can be soda, ammonia, magnesia or magnesium hydroxide, calcium oxide or calcium hydroxide, seawater etc., and the reactant salt that calcium hydroxide and generation can be set generates alkali lye and calcium sulfate precipitation device, make the alkali lye (such as NaOH etc.) of regeneration recycling, reduce alkaline consumption.

Described alkali lye is soda, generates sulfate behind the sulfur dioxide in the soda absorption flue gas, the sulfur trioxide, adds the calcium hydroxide slurry reaction and generates calcium sulfate precipitation and alkali lye, and alkali lye goes absorption system recycling, and precipitation effluxes processed.

The special equipment of above-mentioned flue-gas dust-removing and desulfurization denitrating technique comprises that waste heat using device, sack cleaner, the two hypergravity beds of eddy flow or static cyclone, circulation liquid bath, demist remove the PM2.5 device, join alkali groove, strong oxidizer configuration-system, blower fan, oxidation trough and waste drains pump; Described waste heat using device, sack cleaner link to each other by pipeline successively with the two hypergravity beds of eddy flow or static cyclone; The two hypergravity beds of described eddy flow or static cyclone are communicated with by circulation line with the circulation liquid bath; Described circulation liquid bath links to each other with oxidation trough; Described strong oxidizer configuration-system is by the pipeline connection between pipeline and sack cleaner and the two hypergravity beds of eddy flow or the static cyclone or directly be linked in the reactor; The two hypergravity beds of described eddy flow or static cyclone link to each other except the PM2.5 device with demist; The described alkali groove of joining is connected on the circulation line of the two hypergravity beds of eddy flow or static cyclone and circulation liquid bath; Described oxidation trough is communicated with blower fan, waste drains pump.

Circulation line at the two hypergravity beds of described eddy flow or static cyclone and circulation liquid bath is provided with recycle liquid pump.

Described sack cleaner adopts and can mix cloth bag or the pure PTFE sack cleaner of two overlay film by two overlay film glass potteries high temperature resistant, wear-resisting, acid-alkali-corrosive-resisting.

Can adopt single hypergravity bed to replace the two hypergravity beds of eddy flow or static cyclone.

Beneficial effect: compared with prior art, flue-gas dust-removing and desulfurization denitrating technique of the present invention has following advantage:

(1) adopts waste heat using device that high-temperature flue gas is carried out the heat exchange cooling, when reducing flue-gas temperature, produce hot water or steam, satisfy factory and use.

(2) sack cleaner adopts two overlay film glasses pottery mixed types, can stand 280 ℃ of high temperature, and wearing and tearing that can anti-dust and the corrosion of soda acid can be removed the dust granules of superfine simultaneously, and the dust emission concentration that finally reaches is 30mg/m 3

(3) adopting the two hypergravity beds of eddy flow or static cyclone is the key reaction washer, make flue gas and cleaning solution kickback under Elevated Gravity, reaction rate improves greatly, assimilation effect strengthens greatly, effectively avoided simultaneously the common suction of carbon dioxide in flue gas, in the situation that keeps high removal efficiency, reduced circulating fluid volume, except low alkaline consumption and operating cost.Also can adopt single hypergravity bed as the reaction washer.

(4) nitrogen oxide and oxysulfide and the alkali cleaning in the strong oxidizer oxidation flue gases such as employing ozone or hypochlorite, improved the removal efficiency of nitrogen oxide and oxysulfide, compare with other denitrating techniques, reduced operating cost, the denitration desulfuration efficiency is also good than other techniques.

(5) adopt efficient demist except the PM2.5 device, can greatly reduce pollution and the tail gas water content of PM2.5 particle, reduced tail gas and emitted white plumage phenomenon, can remove the heavy metals such as mercury in the flue gas simultaneously.

Description of drawings

Fig. 1 is flue-gas dust-removing and desulfurization denitrating technique schematic flow sheet.

The specific embodiment

Further illustrate the present invention below in conjunction with accompanying drawing, this specific embodiment is implemented under take technical solution of the present invention as prerequisite, should understand these modes and only be used for explanation the present invention and be not used in and limit the scope of the invention.

A kind of flue-gas dust-removing and desulfurization denitrating technique comprises:

(1) flue gas at first enters waste heat using device and carries out heat exchange cooling, and flue-gas temperature is down to about 150~180 ℃, and the flue gas after the cooling enters sack cleaner, to the dust separation in the flue gas, makes kind of dust be reduced to 30mg/m 3

(2) in flue gas, blast strong oxidizer again, flue gas after the oxidation enters into the two hypergravity beds of eddy flow or static cyclone (or directly oxidation in the two hypergravity beds of eddy flow or batch reactor), alkali lye kickback under the two Elevated Gravities of eddy flow with spray, absorb nitrogen oxide and oxysulfide in the flue gas, generate the rich solution that contains nitrate, nitrite, sulfate, sulphite; Strong oxidizer is ozone, clorox, sodium chlorite, hydrogen peroxide or other strong oxidizers and mixes strong oxidizer; Alkali lye can be soda, ammonia, magnesia or magnesium hydroxide, calcium oxide or calcium hydroxide, seawater etc.

(3) rich solution from diffluence circulation fluid groove, is sent into circulated sprinkling in the two hypergravity beds of eddy flow or the static cyclone by the recycle liquid pump pressurization from the two hypergravity beds of eddy flow again; The concentration of nitric acid acid, nitrite, sulfate, sulphite raises in the rich solution, the discharge unit waste liquid is to oxidation trough, simultaneously in oxidation trough, blast compressed air, make the waste liquid oxidation in the oxidation trough, generate nitrate and sulfate, reduce the COD value of waste liquid, send to sewage disposal system by waste drains pump again.In system, add the new alkali of joining the preparation of alkali groove by the control of the pH value in the circulation liquid bath, to satisfy the required alkali lye amount of system's operation.

(4) flue gas after the two hypergravity beds of eddy flow or the washing of static cyclone except being clean flue gas after the demist of PM2.5 device, removes the chimney qualified discharge through demist.

When alkali lye is soda, generate sulfate behind the sulfur dioxide in the soda absorption flue gas, the sulfur trioxide, add the calcium hydroxide slurry reaction and generate calcium sulfate precipitation and alkali lye, alkali lye goes absorption system recycling, and precipitation effluxes processed.Therefore, the reactant salt that can set up calcium hydroxide and generation generates alkali lye and calcium sulfate precipitation device, makes the alkali lye of regeneration recycling, reduces alkaline consumption.

A kind of special equipment of flue-gas dust-removing and desulfurization denitrating technique comprises that waste heat using device 2, sack cleaner 3, the two hypergravity beds of eddy flow or static cyclone 5, circulation liquid bath 6, demist remove PM2.5 device 8, join alkali groove 9, strong oxidizer configuration-system 10, blower fan 11, oxidation trough 12 and waste drains pump 13; Waste heat using device 2, sack cleaner 3 and the two hypergravity beds of eddy flow or static cyclone 4 link to each other successively by pipeline.The two hypergravity beds of eddy flow or static cyclone 5 and circulation liquid bath 6 are communicated with by circulation line, are provided with recycle liquid pump 7 and join alkali groove 9 at this circulation line.Circulation liquid bath 6 links to each other with oxidation trough 12.Strong oxidizer configuration-system 10 is by the pipeline connection between pipeline and sack cleaner 3 and the two hypergravity beds of eddy flow or the static cyclone 5.The two hypergravity beds of eddy flow or static cyclone 5 link to each other except PM2.5 device 8 with demist.Oxidation trough 12 is communicated with blower fan 11, waste drains pump 13.Wherein, sack cleaner 3 adopts and can remove or the pure PTFE bag dust of two overlay film device by two overlay film glass pottery mixing cloth bags high temperature resistant, wear-resisting, acid-alkali-corrosive-resisting.Can adopt single hypergravity bed to replace and adopt the two hypergravity beds of eddy flow or static cyclone 5.

During work, as shown in Figure 1, flue gas 1 at first enters waste heat using device 2 heat exchange cooling, and flue-gas temperature is down to about 150 ℃, and the flue gas after the cooling enters sack cleaner 3, to the dust separation in the flue gas, makes kind of dust be reduced to 30mg/m 3In flue gas, blast strong oxidizer again by pump 4, strong oxidizer is produced by strong oxidizer configuration-system 10, flue gas after the oxidation enters into the two hypergravity beds of eddy flow or static cyclone 5, alkali lye kickback under the two Elevated Gravities of eddy flow with spray, absorb nitrogen oxide and oxysulfide in the flue gas, generation contains the rich solution of nitrate, nitrite, sulfate, sulphite, rich solution from diffluence circulation fluid groove 6, is sent into circulated sprinkling in the two hypergravity beds of eddy flow or the static cyclone 5 by recycle liquid pump 7 pressurizations from the two hypergravity beds of eddy flow again.Flue gas after the two hypergravity beds of eddy flow or 5 washings of static cyclone except being clean flue gas 14 after 8 demists of PM2.5 device, removes the chimney qualified discharge through demist.

Carrying out along with reaction, the concentration of nitric acid acid, nitrite, sulfate, sulphite raises in the rich solution, need outside discharge unit waste liquid to oxidation trough 12, simultaneously in oxidation trough 12, blast the compressed air of being delivered to by blower fan 11, make the waste liquid oxidation in the oxidation trough 12, generate nitrate and sulfate, reduce the COD value of waste liquid, send to sewage disposal system by waste drains pump 13 again.

Along with the carrying out of reaction, the concentration of alkali lye also can decrease in the system, adds the new alkali of joining 9 preparations of alkali groove by the control of the pH value in the circulation liquid bath 6 in system, to satisfy the required alkali lye amount of system's operation.

Flue-gas dust-removing and desulfurization denitrating technique of the present invention and special equipment thereof, adopt the glass pottery of two overlay films to mix bag-type dust, adopt hypergravity bed work or static cyclone for absorbing the washing reaction device, adopt the smoke comprehensive treatment process of the mode desulphurization denitration of strong oxidizer forced oxidation and alkali cleaning.The deduster capture rate is high, can high temperature resistant and large-scale temperature fluctuation, can capture the superfine flue dust; The hypergravity bed can improve reactive absorption intensity and absorption efficiency greatly as reactor, greatly reduces equipment volume and investment simultaneously; The implementation modular combination is installed, and floor space reduces greatly, the set up install program simple and fast.

Claims (10)

1. a flue-gas dust-removing and desulfurization denitrating technique is characterized in that, comprising:
(1) flue gas at first enters waste heat using device and carries out heat exchange cooling, and flue-gas temperature is down to about 150~180 ℃, and the flue gas after the cooling enters sack cleaner, to the dust separation in the flue gas, makes kind of dust be reduced to 30mg/m 3
(2) in flue gas, add strong oxidizer again, flue gas after the oxidation enters into the two hypergravity beds of eddy flow or static cyclone, or oxidation in the two hypergravity beds of eddy flow or batch reactor, alkali lye kickback under the two Elevated Gravities of eddy flow with spray, absorb nitrogen oxide and oxysulfide in the flue gas, generate the rich solution that contains nitrate, nitrite, sulfate, sulphite;
(3) rich solution from diffluence circulation fluid groove, is sent into circulated sprinkling in the two hypergravity beds of eddy flow or the static cyclone by the recycle liquid pump pressurization from the two hypergravity beds of eddy flow again;
(4) flue gas after the two hypergravity beds of eddy flow or the washing of static cyclone except being clean flue gas after the demist of PM2.5 device, removes the chimney qualified discharge through demist.
2. flue-gas dust-removing and desulfurization denitrating technique according to claim 1, it is characterized in that: the concentration of nitric acid acid, nitrite, sulfate, sulphite raises in the rich solution, the discharge unit waste liquid is to oxidation trough, simultaneously in oxidation trough, blast compressed air, make the waste liquid oxidation in the oxidation trough, generate nitrate and sulfate, reduce the COD value of waste liquid, send to sewage disposal system by waste drains pump again.
3. flue-gas dust-removing and desulfurization denitrating technique according to claim 1 is characterized in that: add the new alkali of joining the preparation of alkali groove by the pH value in the circulation liquid bath and/or the control of import and export acid gas concentration in system, to satisfy the required alkali lye amount of system's operation.
4. flue-gas dust-removing and desulfurization denitrating technique according to claim 1, it is characterized in that: in the step (2), described strong oxidizer is ozone, clorox, sodium chlorite or hydrogen peroxide.
5. flue-gas dust-removing and desulfurization denitrating technique according to claim 1, it is characterized in that: in the step (2), described alkali lye is soda, ammonia, magnesia or magnesium hydroxide, calcium oxide or calcium hydroxide, seawater.
6. flue-gas dust-removing and desulfurization denitrating technique according to claim 1, it is characterized in that: in the step (2), described alkali lye is soda, generate sulfate behind sulfur dioxide in the soda absorption flue gas, the sulfur trioxide, add the calcium hydroxide slurry reaction and generate calcium sulfate precipitation and alkali lye, alkali lye goes absorption system recycling, and precipitation effluxes processed.
7. the special equipment of flue-gas dust-removing and desulfurization denitrating technique claimed in claim 1 is characterized in that: comprise that waste heat using device (2), sack cleaner (3), the two hypergravity beds of eddy flow or static cyclone (5), circulation liquid bath (6), demist remove PM2.5 device (8), join alkali groove (9), strong oxidizer configuration-system (10), blower fan (11), oxidation trough (12) and waste drains pump (13); Described waste heat using device (2), sack cleaner (3) link to each other by pipeline successively with the two hypergravity beds of eddy flow or static cyclone (5); The two hypergravity beds of described eddy flow or static cyclone (5) are communicated with by circulation line with circulation liquid bath (6); Described circulation liquid bath (6) links to each other with oxidation trough (12); Described strong oxidizer configuration-system (10) is by the pipeline connection between pipeline and sack cleaner (3) and the two hypergravity beds of eddy flow or the static cyclone (5); The two hypergravity beds of described eddy flow or static cyclone (5) link to each other except PM2.5 device (8) with demist; The described alkali groove (9) of joining is connected on the circulation line of the two hypergravity beds of eddy flow or static cyclone (5) and circulation liquid bath (6); Described oxidation trough (12) is communicated with blower fan (11), waste drains pump (13).
8. the special equipment of flue-gas dust-removing and desulfurization denitrating technique according to claim 7 is characterized in that: the circulation line at the two hypergravity beds of described eddy flow or static cyclone (5) and circulation liquid bath (6) is provided with recycle liquid pump (7).
9. the special equipment of flue-gas dust-removing and desulfurization denitrating technique according to claim 7 is characterized in that: described sack cleaner (3) adopts can be high temperature resistant, wear-resisting, two overlay film glasses pottery mixing cloth bags or the pure PTFE sack cleaner of two overlay film of acid-alkali-corrosive-resisting.
10. the special equipment of flue-gas dust-removing and desulfurization denitrating technique according to claim 7 is characterized in that: the two hypergravity beds of the single hypergravity bed replacement of described employing eddy flow or static cyclone (5).
CN2012104545253A 2012-11-14 2012-11-14 Flue gas dedusting and desulfurization and denitrification craft and special device thereof CN102974181A (en)

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CN104324575A (en) * 2014-09-19 2015-02-04 东南大学 Spray absorption type system for simultaneous desulphurization and denitration of sintering flue gas
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