CN105771573A - System and method for achieving low-temperature simultaneous desulfurization, denitration and dedusting of flue gas of gas-fired boiler - Google Patents

System and method for achieving low-temperature simultaneous desulfurization, denitration and dedusting of flue gas of gas-fired boiler Download PDF

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Publication number
CN105771573A
CN105771573A CN201610121456.2A CN201610121456A CN105771573A CN 105771573 A CN105771573 A CN 105771573A CN 201610121456 A CN201610121456 A CN 201610121456A CN 105771573 A CN105771573 A CN 105771573A
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gas
flue gas
low
absorption tower
dedusting
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从明耀
陆诗诣
罗洪国
何利
杨晓
金勇�
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Beijing Changxintaihe Energy-Saving Science & Technology Co Ltd
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Beijing Changxintaihe Energy-Saving Science & Technology Co Ltd
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    • 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
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • 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
    • B01D53/76Gas phase processes, e.g. by using aerosols
    • 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
    • B01D53/86Catalytic processes
    • B01D53/8637Simultaneously removing sulfur oxides and nitrogen 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
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • 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
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05CNITROGENOUS FERTILISERS
    • C05C1/00Ammonium nitrate fertilisers
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05CNITROGENOUS FERTILISERS
    • C05C3/00Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/10Oxidants
    • B01D2251/104Ozone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/12Methods and means for introducing reactants
    • B01D2259/124Liquid reactants
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

Provided are a system and method for achieving low-temperature simultaneous desulfurization, denitration and dedusting of flue gas of a gas-fired boiler.The invention aims at solving the problem that at present, when burning is conducted through a gas-fired boiler, exhaust of dust, sulfur dioxide and nitrogen oxide in flue gas is substandard.The invention provides the system and method for achieving low-temperature simultaneous desulfurization, denitration and dedusting of the flue gas of the gas-fired boiler.The system comprises an absorption tower, an ozone generator, a gas distributer, a chimney, an oxygen supply pump, an ammonia water supply tank, an oxidation air blower, a residue storage tank, a catalyst separation and recovery system, a liquid fertilizer storage tank and a circulating pump; for the treatment effect, high desulfurization rate, denitration dedusting rate and dedusting rate are achieved; the system is low in investment cost, low in energy consumption and convenient and rapid to use.

Description

A kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting
Technical field
The present invention relates to a kind of system and method to gas fired-boiler flue gas low-temperature denitration coordinated desulfurization, dedusting.
Background technology
The process of gas fired-boiler fume emission, is always up the indispensable part of field of Environment Protection, and gas fired-boiler smoke emissioning pollution thing is mainly sulfur dioxide, nitrogen oxides and dust.Sulfur dioxide is the water white transparency gas with pungent odour, and in an atmosphere, it can be oxidized to sulfuric acid mist or sulfate aerosol, is the main matter forming acid rain.Nitrogen oxides is primarily referred to as nitric oxide and nitrogen dioxide.The respiratory tract of nitrogen oxides major determinant people, one of nitrogen dioxide or the origin cause of formation of acid rain.Under irradiation by sunlight, make often can occur between the nitrogen oxides in air, Hydrocarbon and ozone a series of photochemical reaction due to ultraviolet effect, and generate blue smog (being sometimes with a little purple or yellowish-brown).The zest of photochemical fog and hazardness are much stronger than primary pollution, so the generation of primary pollution need to be stopped.
In prior art, the process for the material such as sulfide, nitrogen oxides mainly has following several method.Independent denitrating technique, the denitration efficiency of SCR denitration technique is higher, 90% can be reached, but the suitable reaction temperature of traditional SCR denitration technique is between 350~420 DEG C, conventional combustion gas maximum smoke temperature 210 DEG C, adopt SCR denitration technique can not reach the reaction temperature window of the best, therefore do not recommend SCR denitration technique.Although having had up-to-date middle low temperature SCR denitration technique now, good denitration efficiency can be reached between 160~300 DEG C, but the flue-gas temperature after desulfurizing tower is typically in 50~60 DEG C, according to middle low temperature SCR denitration technique, then need to be equipped with a set of GGH system, be can be only achieved after the flue gas that desulfurizing tower is discharged the purpose of denitration, whole plant investment promotes, and GGH floor space is relatively big, and GGH easily blocks, corrosion, running status is unstable.Independent sulfur removal technology, Limestone-gypsum Wet Flue Gas Desulfurization Process technique needs to be equipped with a set of conveying, stocking system and follow-up gypsum dehydration system for desulfurizing agent, Limestone-gypsum Wet Flue Gas Desulfurization Process technique is run in a large number along with power plant, the selling market of by-produced gypsum also tends to saturated, and adopts the calcium sulphate solid made of limestone-gypsum method mostly to turn black jaundice, not good, market is limited, and price is relatively low, side-product income is relatively low, and other industry is not suitable for using this kind of method;And limestone is slightly soluble medium, under the dissolubility in water, chemical reaction rate is relatively slow, as SO in gas phase2Concentration relatively low time, it is necessary to bigger calcium sulfur ratio and bigger recycle slurry liquid measure just can make the SO in serosity and flue gas2Reaction, the SO that present key area is required further2Concentration of emission 35mg/Nm3Hereinafter, limit the use of limestone-gypsum method, add that in limestone-gypsum running, slurry solid content is big, the serious wear (particularly circulating pump) to equipment, add the replacing of equipment, maintenance cost in plant running process.Independent dedusting technology, dedusting prevailing technology technology is dry dust removal and wet dust removal technique.Dry dust removal technique is mainly bag-type dusting technique, dry electric precipitation technique, electricity bag composite dedusting etc..Adopting dry dust removal technique need to increase a whole set of dust arrester newly, floor space is big, and investment height.
Therefore, research and development one can synchronize process dust up to standard, SO in gas fired-boiler tail flue gas technology2, NOx atmosphere pollution system, solve to there is no under low temperature and carry out processing NOx, SO for gas fired-boiler integration2, dust problem.
Summary of the invention
Present invention aim to address currently used gas fired-boiler burning after exhaust gas dust, sulfur dioxide, the problem that discharged nitrous oxides is not up to standard, the present invention provides a kind of system and method to flue gas low-temperature synchronized desulfuring and denitrifying dedusting, flue gas produced by gas fired-boiler can be made at low temperatures, treatment effect reach the desulfurization degree of more than 99%, the denitration rate of more than 90% and more than 60% dust removal efficiency, this cover system cost of investment is low, energy expenditure is low, easy to use.
The technical scheme is that a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting, it is characterized in that, system includes absorption tower, ozonator, gas distributor, chimney, oxygen supply pump, ammonia supplying tank, oxidation fan, slag ladle, separation and recovery of catalyst system, liquid fertilizer storage tank and circulating pump.Described absorption tower is by after gas distributor at ozonator, its top is connected in line chimney, the inside filling tower internals on described absorption tower and low temperature organic catalyst, the bottom on described absorption tower is connected with ammonia supply pump, described ammonia supply pump has two, one is connected to ammonia supplying tank, the ammonia supply pump of the other end is connected with separation and recovery of catalyst system, the two ends of described separation and recovery of catalyst system connect liquid fertilizer storage tank and slag ladle respectively, and described oxidation fan is connected with bottom, absorption tower.
Further, the described method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting specifically comprises the following steps that
Step one: gaseous oxygen enters ozonator after being decompressed to 0.2MPa, the ozone gaseous mixture that ozonator produces enters gas fired-boiler flue gases duct;
Step 2: gas fired-boiler flue gas by after cigarette gas distributor with ozone reaction, now smelly oxygen gas mixture contacts with the lower nitrogen oxides in flue gas, gas distributor in flue makes ozone and flue gas be fully contacted, after the nitrogen oxides of flue gas state at a middle or low price is oxidized to higher nitrogen oxides, subsequently into absorption tower;
Step 3: flue gas moves vertically upward in absorption tower, reacts with the water in mixed liquor in absorption tower, generates H2SO3And HNO2, wherein, SO3 2-And NO2 -It is mixed the low temperature organic catalyst in liquid to catch, generates stable chelate, the SO under aerobic environment, in chelate3 2-And NO2 -Composition is substantially oxidized into stable SO4 2-And NO3 -, and reacting, with the ammonia provided, the ammonium salt solution that generation is stable, low temperature organic catalyst separates from chelate and reduces simultaneously;
Step 4: when saline solution concentration reaches 40%, take out the dust that in absorption tower, the solid-liquid separation Partial filtration of catalyzed dose of separation and recovery system of mixed liquor is a small amount of and enter slag ladle, filtrate containing low temperature organic catalyst carries out secondary separation again in the Liquid liquid Separation part of separation and recovery of catalyst system, low temperature organic catalyst after Liquid liquid Separation is recycled to absorption tower and recycles, ammonium salt liquid enters liquid fertilizer storage tank and enters follow-up manufacturer and process, and the flue gas after purification is from the discharge up to standard of tower top direct exhaust chimney.
Further, the method in described step one belongs to low-temperature denitration, and its temperature is 30-180 DEG C.
Further, the addition of described ozone is directly proportional to nitrogen oxides in effluent, and mol ratio is 1: 1.
Further, described method passes through low temperature organic catalyst chelating catalytic action scrubbing CO_2.
Further, described method is by low temperature organic catalyst efficient chelating catalytic action elimination nitrogen oxides together with ozone.
Further, the described method method for designing elimination dust granules thing by catalyst adhesive effect and whole system.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described desulphurization and denitration oxidative system is made up of ozonator and ozone gas distributor, and described ozonator is connected by oxygen channel, gas fired-boiler side provide gaseous oxygen, and wherein, described ozonator can use liquid oxygen source or air source.
Further, described ammonia is reclaimed from gas fired-boiler user, it is possible to for KOH, KHCO3、(NH4)2HPO4In one or more mixture.
Further, the top on described absorption tower is connected in line chimney, and in the qualified situation of anti-corrosion measure, the flue gas after purification may also pass through the original smoke stack emission of gas fired-boiler user, does not set up top, described absorption tower direct exhaust chimney.
Further, being filled with low temperature machine catalyst in described absorption tower, this catalyst reusable edible, it just fills ratio (volume) and can adjust between 10-50% according to pollutant levels.
Beneficial effects of the present invention is as follows:
First, native system and method desulfurized effect are extremely strong, because under the effect of catalyst, even if using sulphur coal, native system remains to control at extremely low discharge value by exhanst gas outlet sulfur content concentration, such as sulfur dioxide: 10mg/Nm3Below.Native system achieves real low-temperature denitration, without high temperature section, any change is done without to former flue gas generation systems, by ozone and organic catalyst combined effect, the low-temperature denitration to flue gas can be realized in the temperature range of 30 DEG C-180 DEG C, and discharged nitrous oxides can be made to reach 30mg/Nm3Following effect.
Native system has multiple-effect purification function, in same emission-reducing system, it is possible to there is the effect that the pollutant multiple-effect such as denitration (reaching more than 90%), desulfurization (up to more than 99%), dedusting (can reach more than 60%) reduce discharging simultaneously;Average for exhanst gas outlet pollutant levels can be controlled at extremely low discharge value by native system, for instance the discharge capacity of sulfur dioxide is at 10mg/Nm3Hereinafter, the discharge capacity of nitrogen oxides is at 30mg/Nm3Hereinafter, the discharge capacity of dust granules thing is at 5mg/Nm3Below.Native system, because of non-wastewater discharge at work, so that water resource can recycle, does not produce aerosol phenomenon.The side-product ammonium fertilizer produced at work has stable market channel, so thoroughly solving environmental protection various problems.
This method belongs to without back reaction, and its low temperature organic catalyst can effectively stop the back reaction that ite decomposes to occur, and in ammonia process of desulfurization denitration, there is no intermediate product (NH4)2SO3Generation, thus effectively avoiding the generation of the phenomenons such as flue gas hangover, the escaping of ammonia.After the reaction owing to the ammonium fertilizer quality of compound byproduct of ammonium sulfate, ammonium nitrate is high, ammonium fertilizer can be reached and produce concerned countries standard, so significant side-product income can be brought, system operation cost is greatly lowered.
In summary, the present invention high temperature section need not reduce cost, decreases the energy expenditure that high-temp combustion causes simultaneously, non-secondary pollution and can reclaim economic benefit, easy to use and easy to maintenance.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting of the present invention;
In accompanying drawing, the list of parts representated by each label is as follows:
1 is absorption tower, and 2 is chimney, and 3 supply pump for ammonia, and 4 is ammonia supplying tank, and 5 is oxidation fan, and 6 is slag ladle, and 7 is separation and recovery of catalyst system, and 8 is liquid fertilizer storage tank, and 9 is circulating pump, and 10 is gas distributor, and 11 is ozonator.
Detailed description of the invention
It is further described below according to specific embodiment.
nullA kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting,System includes absorption tower 1,Chimney 2,Ammonia supply pump 3,Ammonia supplying tank 4,Oxidation fan 5,Slag ladle 6,Separation and recovery of catalyst system 7,Liquid fertilizer storage tank 8,Circulating pump 9,Gas distributor 10 and ozonator 11,Absorption tower 1 is after ozonator 11 passes through gas distributor 10,Its top is connected in line chimney 2,The inside filling tower internals on absorption tower 1 and low temperature organic catalyst,The bottom on absorption tower 1 is connected with ammonia supply pump,Ammonia supply pump 3 has two,One is connected to ammonia supplying tank 4,The ammonia supply pump of the other end is connected with separation and recovery of catalyst system 7,The two ends of separation and recovery of catalyst system 7 connect liquid fertilizer storage tank 8 and slag ladle 6 respectively,Oxidation fan 5 is connected with bottom, absorption tower 1.
The method of gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting specifically comprises the following steps that
Step one: gaseous oxygen enters ozonator after being decompressed to 0.2MPa, the ozone gaseous mixture that ozonator produces enters gas fired-boiler flue gases duct;The temperature of its low-temperature denitration is 60 DEG C;
Step 2: gas fired-boiler flue gas by after cigarette gas distributor with ozone reaction, the addition of ozone is directly proportional to nitrogen oxides in effluent, mol ratio is 1: 1, now smelly oxygen gas mixture contacts with the lower nitrogen oxides in flue gas, gas distributor in flue makes ozone and flue gas be fully contacted, after the nitrogen oxides of flue gas state at a middle or low price is oxidized to higher nitrogen oxides, subsequently into absorption tower;
Step 3: flue gas moves vertically upward in absorption tower, reacts with the water in mixed liquor in absorption tower, generates H2SO3And HNO2, wherein, SO3 2-And NO2 -It is mixed the organic catalyst in liquid to catch, generates stable chelate, the SO under aerobic environment, in chelate3 2-And NO2 -Composition is substantially oxidized into stable SO4 2-And NO3 -, and reacting, with the ammonia provided, the ammonium salt solution that generation is stable, low temperature organic catalyst separates from chelate and reduces simultaneously;
Step 4: when saline solution concentration reaches 40%, take out the dust that in absorption tower, the solid-liquid separation Partial filtration of catalyzed dose of separation and recovery system of mixed liquor is a small amount of and enter slag ladle, filtrate containing low temperature organic catalyst carries out secondary separation again in the Liquid liquid Separation part of separation and recovery of catalyst system, organic catalyst after Liquid liquid Separation is recycled to absorption tower and recycles, ammonium salt liquid enters liquid fertilizer storage tank and enters follow-up manufacturer and process, and the flue gas after purification is from the discharge up to standard of tower top direct exhaust chimney.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within the claimed scope of the invention.

Claims (7)

  1. null1. the system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting,It is characterized in that,System includes absorption tower,Ozonator,Gas distributor,Chimney,Oxygen supply pump,Ammonia supplying tank,Oxidation fan,Slag ladle,Separation and recovery of catalyst system,Liquid fertilizer storage tank and circulating pump,Described absorption tower is by after gas distributor at ozonator,Its top is connected in line chimney,The inside filling tower internals on described absorption tower and low temperature organic catalyst,The bottom on described absorption tower is connected with ammonia supply pump,Described ammonia supply pump has two,One is connected to ammonia supplying tank,The ammonia supply pump of the other end is connected with separation and recovery of catalyst system,The two ends of described separation and recovery of catalyst system connect liquid fertilizer storage tank and slag ladle respectively,Described oxidation fan is connected with bottom, absorption tower.
  2. 2. a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting according to claim 1, it is characterised in that the described method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting specifically comprises the following steps that
    Step one: gaseous oxygen enters ozonator after being decompressed to 0.2MPa, the ozone gaseous mixture that ozonator produces enters gas fired-boiler flue gases duct;
    Step 2: gas fired-boiler flue gas by after cigarette gas distributor with ozone reaction, now smelly oxygen gas mixture contacts with the lower nitrogen oxides in flue gas, gas distributor in flue makes ozone and flue gas be fully contacted, after the nitrogen oxides of flue gas state at a middle or low price is oxidized to higher nitrogen oxides, subsequently into absorption tower;
    Step 3: flue gas moves vertically upward in absorption tower, reacts with the water in mixed liquor in absorption tower, generates H2SO3And HNO2, wherein, SO3 2-And NO2 -It is mixed the low temperature organic catalyst in liquid to catch, generates stable chelate, the SO under aerobic environment, in chelate3 2-And NO2 -Composition is substantially oxidized into stable SO4 2-And NO3 -, and reacting, with the ammonia provided, the ammonium salt solution that generation is stable, low temperature organic catalyst separates from chelate and reduces simultaneously;
    Step 4: when saline solution concentration reaches 40%, take out the dust that in absorption tower, the solid-liquid separation Partial filtration of catalyzed dose of separation and recovery system of mixed liquor is a small amount of and enter slag ladle, filtrate containing low temperature organic catalyst carries out secondary separation again in the Liquid liquid Separation part of separation and recovery of catalyst system, low temperature organic catalyst after Liquid liquid Separation is recycled to absorption tower and recycles, ammonium salt liquid enters liquid fertilizer storage tank and enters follow-up manufacturer and process, and the flue gas after purification is from the discharge up to standard of tower top direct exhaust chimney.
  3. 3. a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting according to claim 2, it is characterised in that the method in described step one belongs to low-temperature denitration, and its temperature is 30-180 DEG C.
  4. 4. a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting according to claim 2, it is characterised in that the addition of described step 2 ozone is directly proportional to nitrogen oxides in effluent, and mol ratio is 1: 1.
  5. 5. a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting according to claim 2, it is characterised in that described step 3 passes through low temperature organic catalyst chelating catalytic action scrubbing CO_2.
  6. 6. a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting according to claim 2, it is characterised in that described step 3 is by low temperature organic catalyst efficient chelating catalytic action elimination nitrogen oxides together with ozone.
  7. 7. a kind of system and method to gas fired-boiler flue gas low-temperature synchronized desulfuring and denitrifying dedusting according to claim 2, it is characterised in that the described method method for designing elimination dust granules thing by catalyst adhesive effect and whole system.
CN201610121456.2A 2016-03-04 2016-03-04 System and method for achieving low-temperature simultaneous desulfurization, denitration and dedusting of flue gas of gas-fired boiler Pending CN105771573A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110944731A (en) * 2017-07-20 2020-03-31 阿里尔科学创新有限公司 Catalytic oxidation of NOx/SOx in flue gas using atmospheric oxygen as oxidizing agent
CN109550378A (en) * 2017-09-26 2019-04-02 萍乡市普天高科实业有限公司 Low-temp desulfurization denitration device and its technique in a kind of flue gas
CN109772121A (en) * 2019-03-08 2019-05-21 河海大学 A kind of non-electrical industry flue gas low-temperature denitration and dirt sulphur integral processing device

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Application publication date: 20160720