CN201020334Y - Desulfurization denitration integrative smoke purifying device - Google Patents

Desulfurization denitration integrative smoke purifying device Download PDF

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Publication number
CN201020334Y
CN201020334Y CNU2007200060671U CN200720006067U CN201020334Y CN 201020334 Y CN201020334 Y CN 201020334Y CN U2007200060671 U CNU2007200060671 U CN U2007200060671U CN 200720006067 U CN200720006067 U CN 200720006067U CN 201020334 Y CN201020334 Y CN 201020334Y
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China
Prior art keywords
denitration
tower body
desulfurization
desulfation
waste liquid
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Expired - Lifetime
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CNU2007200060671U
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Chinese (zh)
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毛健
尤生全
孙江榕
康志杰
杨春广
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THUMB ENTIRONMENT-FRIENDLY TECHNOLOGY GROUP (FUJIAN) Co Ltd
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THUMB ENTIRONMENT-FRIENDLY TECHNOLOGY GROUP (FUJIAN) Co Ltd
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Abstract

The utility model relates to a desulfation, denitration all-in-one smoke gas purification device, which comprises a tower body. The purification device is characterized in that: inside the tower body, a distance sleeve, the top of which is connected with the top plate of the tower body, is positioned, so that the periphery of the internal cavity of the tower body forms a desulfation room while the internal cavity of the tower body forms a denitration room. A smoke gas inlet and a desulfurizer spray pipe are arranged in the upper part of the desulfation room and a desulfation aeration basin is positioned in the lower part of the desulfation room; the desulfation room is separated by a plurality of distance sleeves to form the inward constantly up and down turning denitration flue layers; the upper part of each denitration flue layer is provided with a denitrifying agent spray pipe; a plurality of sections of denitrifying filling materials are positioned at intervals along the trend of the smoke gas; a waste liquid recycle pond is arranged in the lower part of the denitration flue layers; the waste liquid circulating pump and the outlet of the waste liquid circulating pump are connected in parallel with the liquid inlet pipe of the denitrifying agent, which links to the denitrifying agent spray pipe; after the smoke gas of the denitration flue layers positioned in the centre is demisted by the demister arranged on the upper part of the denitration flue layers, the smoke gas is discharged upwardly through the central through holes on the top plate of the tower body. The utility model aims at providing a desulfation, denitration all-in-one smoke gas purification device, which has a simple structure, high efficiency of desulfation and denitration and a good effect of smoke gas.

Description

The desulfurization and denitrification integral smoke eliminator
Technical field
The utility model relates to a kind of gas sweetening unit, particularly relates to a kind of desulfurization and denitrification integral smoke eliminator.
Background technology
Up to now, it is many that the coal-fired flue-gas nitrogen oxide of countries in the world exploitation is administered the technology kind, from the different denitrating technique of form now that is improved to of various stove combustion process such as low oxygen combustion, flue gas recirculation burning, secondary firing, bias combustion, sectional combustion, low NO, wherein SCR method and SNCR method obtain commercial the application at large coal-fired power plant.Wherein the SCR method has hundreds of successful Application achievement and the operating experience of more than ten years in the world.In addition, also have liquid absorption method, microorganism absorption process, non-selective catalytic reduction, red-hot charcoal reduction method, catalytic decomposition method, liquid-film method, SNRB technology denitration technology, reaction type oxidation to absorb denitration technology etc.
1.1。Selective catalytic reduction
Selective catalytic reduction (Selective Catalytic Reduction SCR) is meant under the effect of catalyst, with NH3 as reducing agent, " selective " with flue gas in NOx reaction and generate the N2 and the H2O of nontoxic pollution-free.Select suitable catalyst can make in the temperature range that is reflected at 200-400 ℃ and carry out, and can suppress the generation of side reaction effectively.Be under 1 the situation, can obtain NOx removal efficiency in NH3 and NO stoichiometric proportion up to 80-90%.The arrangement of SCR system has three kinds, and the above-mentioned arrangement of stone power plant afterwards is called the high-temperature high dust arrangement, also has the arrangement form of low dirt of high temperature and the low dirt of low temperature in addition.The high-temperature high dust arrangement is be most widely used at present a kind of, and its advantage is that catalytic reactor is in 300-400 ℃ the temperature range, helps the carrying out that reacts, yet because catalyst is in the high cloud of dust gas, inclement condition, polish-brush is serious, and the life-span will be affected.The low dirt arrangement of high temperature is meant that the SCR reactor is arranged between the hot electrostatic precipitator and air preheater behind the economizer, this arrangement can prevent flying dust in the flue gas to the pollution of catalyst with to the wearing and tearing and the obstruction of reactor, and its shortcoming is that electric cleaner service condition under 300 ~ 400 ℃ high temperature is poor.The low dirt of low temperature (or claiming afterbody to arrange) mode of arranging is that the SCR reactor is arranged in after deduster and the flue gas desulphurization system, catalyst is not subjected to the influence of flying dust and SO2, but because flue-gas temperature is lower, generally need gas-gas heat exchanger or employing to add fuel oil or the natural gas burning device is brought up to the activity of such catalysts temperature with the cigarette temperature, certainly will increase energy resource consumption and operating cost.
The method that NH3-SCR eliminates NO has realized industrialization, and have reaction temperature lower (573~753K), catalyst do not contain advantages such as noble metal, life-span be long.But also have significant disadvantages [2]: (1) owing to used corrosivity very strong NH3 or ammoniacal liquor, the requirement height to pipeline equipment, and (80 dollars of investment costs/kW) [3] involve great expense; (2) because error can appear in the addition control of NH3, cause secondary pollution easily; (3) easily leak, operation and storage difficulty, and be easy to form (NH-4) 2SO4; (4) this process can only be applicable to the purification of stationary source, is difficult to solve the NO that produces as moving sources such as automobile engines and eliminates problem.
1.2。On-catalytic selective reduction method (SNCR method)
This method principle is with the SCR method, owing to there is not catalyst, reacts temperature required higher (900~1200 ℃), therefore need control reaction temperature well, in order to avoid ammonia is oxidized to nitrogen oxide.This method purifying rate is 50%.
These method characteristics are not need catalyst, and rebuilding old equipment is few, and investment is than SCR method little (15 dollars/kW[3 of investment cost]).But the ammoniacal liquor consumption is than the SCR fado.No. 2 units of 1~No. 4 oil burning boiler of the loose island thermal power plant of Japan, two boilers of Yokkaichi thermal power plant, No. 2 units knowing the 350MW of many thermal power plants and the 350MW of Yokosuka thermal power plant have all adopted the SNCR method.But present most of boiler does not adopt the SNCR method, and main cause is as follows: (1) efficient not high (the NOx discharge capacity of oil burning boiler only reduces by 30%~50%); (2) consumption of increase reactant and vehicle medium (air); (3) leakage rate of ammonia is big, atmosphere pollution not only, and when combustion of sulfur fuel,, can make air preheater stop up [4] owing to there is ammonium hydrogen sulfate to form.
1.3。The catalytic decomposition method
In theory, NO resolves into N2 and O2 is reaction favourable on the thermodynamics, NO → 1/2N2+1/2O2, and Δ fGm=-86kJ/mol, but the activation energy that should react needs appropriate catalyst to reduce activation energy up to 364kJ/mol, could realize decomposition reaction.Because this method is simple, expense is low, be considered to the most promising denitrogenation method,, mainly contain the molecular sieve of noble metal, metal oxide, perovskite composite oxide and metal ion exchanged etc. so people have carried out a large amount of work for seeking appropriate catalyst for many years.
Noble metals such as Pt, Rh, Pd are dispersed on the carriers such as Pt/7-Al2O3, can be used for the catalytic decomposition of NO.Under equal conditions, Pt class catalyst activity is the highest.It is more extensive that noble metal catalyst is used for the research of NO catalytic decomposition, in recent years, the work of this respect mainly is to utilize some alkali metal and transition metal ions that single supported precious metal catalyst is carried out modification, to improve activity of such catalysts and stability.
1.4。Plasma is administered technology
Electron beam (electron|beam, EB) ratio juris is the high-power electron beam that utilizes electron accelerator to produce, the gas that direct irradiation is pending, by oxygen molecule in high energy electron and the gas and hydrone collision, make it disassociation, ionization, form nonequilibrium plasma, a large amount of active particles that wherein produced (as OH, O and HO2 etc.) react with pollutant, make it oxidation removal [5].Many countries have set up a collection of electron beam test facilities and demonstration workshop.The demonstration workshop operation result of Japan, Germany, the U.S. and Poland shows that the gross efficiency that this electron beam system is removed SO2 surpasses 95% usually, and the efficient of removing NOx reaches 80%~85%[6].
1.5。Liquid absorption method
NOx is a sour gas, can be by the NOx in the alkaline solution absorption cleaning waste gas.Common absorbent has: water, rare HNO3[9], NaOH, Ca (OH) 2, NH4OH, Mg (OH) 2 etc.For improving the absorption efficiency of NOx, can adopt the oxidation absorption process again, absorb reducing process and complexed absorption method etc.The oxidation absorption process is NO2 with the NO partial oxidation earlier, absorbs with alkali lye again.Gaseous oxidizing agent has O2, O3, Cl2 and ClO2 etc.; The liquid phase oxidation agent has HNO3, KMnO4, NaClO2, NaClO, H2O2, KBrO3, K2Br2O7, Na3CrO4, (NH4) 2Cr2O7 etc.Absorb reducing process application reducing agent NOx is reduced into N-2, reducing agent commonly used has (NH4) 2SO4, (NH4) HSO3, Na2SO3 etc.The liquid complexing absorption process mainly utilizes the liquid complexing agent directly with the NO reaction, therefore has special meaning for handling the NOx tail gas that mainly contains NO.The complex compound that NO generates is emitted NO again when heating, thereby makes NO energy enriching and recovering.The NO complexed absorption agent of studying at present has FeSO4, Fe (II)-EDTA and Fe (II)-EDTANa2SO4 etc.
This method removal efficiency to NO on experimental provision can reach 90%, but is difficult to the removal efficiency that reaches such on commercial plant.People such as Peter, Harri, Ott have reached 10%~60% NO removal efficiency [10] at pilot-scale.
1.6。Absorption method
Absorption method is to utilize adsorbent the variation with temperature or pressure changes to the adsorbance of NOx, and by periodic variation operating temperature or pressure, absorption and the desorb of control NOx are separated NOx from source of the gas, belong to the dry method denitration technology.According to the difference of regeneration, absorption method can be divided into alternating temperature absorption method and pressure swing adsorption method.Alternating temperature absorption method denitration research early has some commercial plants.Pressure swing adsorption method is a kind of newer denitration technology of researching and developing recently.Adsorbent commonly used has heteropoly acid, molecular sieve, active carbon, silica gel and contains NH3 [11] such as mud coals.
The advantage of adsorption method for purifying NOx waste gas is: the purification efficiency height, do not consume chemical substance, and equipment is simple, and is easy to operate.Shortcoming is: because the adsorbents adsorb capacity is little, the quantity of sorbent that needs is big, and equipment is huge, needs regeneration to handle; Process is intermittently operated, and investment cost is higher, and energy consumption is bigger.
1.7。Bioanalysis is handled
The essence that bioanalysis is handled is to utilize the vital movement of microorganism that NOx is converted into harmless inorganic matter and cells of microorganisms matter.Because this process is difficult to carry out in gas phase, so the pollutant of gaseous state is earlier transferred to mass transport process in the liquid film of liquid phase or solid phase surface through the gas phase of associating, biodegradable solubility pollutant enters the biomembrane of filter tower filling surface from gas phase, and through diffusing into microorganism cultures wherein.Then, pollutant is as the required nutrients of microbial metabolism, in the purification [12] that is degraded by microorganisms of liquid phase or solid phase.
The research staff of U.S. Idaho national engineering laboratory (Idaho National Engineering Laboratory) has invented the technology [13] with NOx in the denitrifier reduction flue gas the earliest.Be about 1min when the time of staying (EBRT) of flue gas in tower, when the NO inlet concentration was 335mg/m3, the clearance of NO can reach 99%.The optimum temperature of bacterium is 30~45 ℃ in the tower, and the pH value is 6.5~8.5.
NOx does not use catalyst in the microbial method smoke treatment, and cost is low; Do not use reducing agent NH 3, do not have the secondary pollution problem of ammonia; Though disposable denitration chamber equipment volume is big, avoided using the equipment of ammonia system, the equipment less investment, the safety and sanitation condition is quite a lot of, is up-and-coming method of denitration.
The utility model had both utilized wet desulphurization, bioanalysis denitration and flue gas heating jacket, smoke exhaust pipe is integrated combines, and forms a kind of desulfurization and denitrification integral smoke eliminator.
Summary of the invention
The purpose of this utility model provides a kind of desulfurization and denitrification integral smoke eliminator, and this device construction is simple, the denitrification efficiency height, and gas cleaning is effective.
The utility model comprises tower body, it is characterized in that: be provided with the separation sleeve that the upper end connects with the tower body top board in the described tower body, so that forming desulfurization chamber tower body inner chamber, tower body inner chamber perimembranous forms the denitration chamber, described desulfurization chamber top is provided with gas approach and desulfurizing agent spray beautiful jade pipe, the bottom is provided with the desulfurization aeration tank, described desulfurization chamber is separated to form going up outside to inside certainly of can being communicated with the desulfurization chamber bottom through several not isometrical separation sleeves again, the denitration flue layer of following continuous widely different commentaries on classics, each denitration flue layer top is provided with the denitrfying agent shower, and be arranged at intervals with plurality of sections denitration filler along flue gas trend, denitration flue layer bottom is provided with the waste liquid circulatory pool, the waste liquid circulating pump, described waste liquid outlet of circulating pump with lead to the denitrfying agent shower after the denitrfying agent feed tube is in parallel, the flue gas of the denitration flue that is arranged in is upwards discharge after the demister demist of portion provided thereon.
Advantage of the present utility model is: its floor space is little, multiple functional, the gas cleaning combination is simple, resistance is little, saving flue, smoke exhaust pipe material, can satisfy the improvement requirement of the smoke exhaust pipe of desulphurization denitration heating from now on fully, is high-efficiency desulfurization denitrification integral smoke eliminator.
Description of drawings
Fig. 1 is an organigram of the present utility model.
23 is the desulfurizing agent feed tube among the figure; 24 is the desulfurizing agent circulating pump; 25 is agitator; 26 is the desulfurizing agent shower nozzle; 27 is the denitrfying agent shower nozzle; 28 is gas approach; 29 is exhanst gas outlet; 31 for purifying exhanst gas outlet; 32 is the desulfurizing agent circulation pipe; 33 is the denitrfying agent circulation pipe; 34 is composite desulfate denitration chamber; 35 is running water pipe.
The specific embodiment
The utility model comprises tower body 1, it is characterized in that: be provided with the separation sleeve 2 that the upper end connects with the tower body top board in the described tower body, so that forming desulfurization chamber 3 tower body inner chambers, tower body inner chamber perimembranous forms denitration chamber 4, described desulfurization chamber top is provided with gas approach 5 and desulfurizing agent spray beautiful jade pipe 6, the bottom is provided with desulfurization aeration tank 7, described desulfurization chamber is separated to form going up outside to inside certainly of can being communicated with the desulfurization chamber bottom through several not isometrical separation sleeves again, the denitration flue layer 8 of following continuous widely different commentaries on classics, each denitration flue layer top is provided with denitrfying agent shower 9, and be arranged at intervals with plurality of sections denitration filler 10 along flue gas trend, denitration flue layer bottom is provided with waste liquid circulatory pool 11, waste liquid circulating pump 12, described waste liquid outlet of circulating pump is led to the denitrfying agent shower with denitrfying agent feed tube 13 backs in parallel, and the flue gas that is positioned at the denitration flue layer of central authorities is upwards discharged from tower body top board middle part through hole 30 after demister 14 demists of portion provided thereon.
Above-mentioned demister is provided with running water and cleans shower nozzle 15.
Enter desulfurization chamber 3 behind the flue gas heating jacket 22 of the above-mentioned flue gas that enters through being located at tower body top board smoke exhaust pipe 16 peripheries, described flue gas after the demister demist is discharged from smoke exhaust pipe after top board heating jacket inner chamber is heated.
Above-mentioned aeration tank is provided with agitator 17 and has the aeration tube 19 and the outer comb 20 of desulfurization waste liquor of aeration head 18, also is provided with the outer comb 21 of denitration waste liquid on the described waste liquid circulatory pool.
During work, boiler hot flue gas from dedusting enters from the gas approach 28 on the flue gas heating jacket 22, with the flue gas after being purified indirect heat exchange, pass through exhanst gas outlet 29 subsequently, the gas approach 5 on desulfurization chamber top enters the top of desulfurization chamber 3, evenly mix from desulfurizing agent shower 6, the desulfurizing agent of desulfurizing agent shower nozzle 26 carries out wet desulphurization, flue gas after the desulfurization enters the denitration chamber 4 of the inside, piecemeal by denitration filler 10 and denitrfying agent shower 9, denitrfying agent shower nozzle 27, redistribute the next denitration liquid of liquid section and carry out the bioanalysis denitration reaction, reacted purification wet flue gas is removed water smoke through demister 14, middle part through hole 30 by the tower body top board enters flue gas heating jacket 22 and carries out the flue gas heat treated again, enters smoke exhaust pipe 16 qualified discharges by purifying exhanst gas outlet 31 at last; The desulfurizing agent continuous supplementation quantitatively is fed in the desulfurization chamber 3 by desulfurizing agent feed tube 23, desulfurizing agent recycles by desulfurizing agent circulating pump 24, desulfurizing agent circulation pipe 32, the sulphite that desulfurization is got off changes sulfate into by the air oxidation that aeration tube 19, aeration head 18 are supplied with in aeration tank 7, and under the guiding of aeration tank agitator 17, comb 20 is discharged desulfurization chamber outside desulfurization waste liquor; The denitrfying agent continuous supplementation quantitatively is fed in the denitration chamber 4 by denitrfying agent feed tube 13, denitrfying agent recycles by denitrfying agent waste liquid circulating pump 12, denitrfying agent circulation pipe 33, the waste liquid that denitration is got off is under the guiding of waste liquid circulatory pool agitator 25, and comb 21 is discharged composite desulfate denitration chamber 34 outside the denitration waste liquid; Running water pipe 35 is supplied with and is cleaned shower nozzle 15 running water, regularly cleans the dirt on the demister 14, and its waste water merges the denitration waste liquid together to be handled.

Claims (4)

1. desulfurization and denitrification integral smoke eliminator, comprise tower body, it is characterized in that: be provided with the separation sleeve that the upper end connects with the tower body top board in the described tower body, so that forming desulfurization chamber tower body inner chamber, tower body inner chamber perimembranous forms the denitration chamber, described desulfurization chamber top is provided with gas approach and desulfurizing agent spray beautiful jade pipe, the bottom is provided with the desulfurization aeration tank, described desulfurization chamber is separated to form going up outside to inside certainly of can being communicated with the desulfurization chamber bottom through several not isometrical separation sleeves again, following continuous rotating denitration flue layer, each denitration flue layer top is provided with the denitrfying agent shower, and be arranged at intervals with plurality of sections denitration filler along flue gas trend, denitration flue layer bottom is provided with the waste liquid circulatory pool, the waste liquid circulating pump, described waste liquid outlet of circulating pump with lead to the denitrfying agent shower after the denitrfying agent feed tube is in parallel, the flue gas that is positioned at the denitration flue layer of central authorities is upwards discharged from tower body top board middle part through hole after the demister demist of portion provided thereon.
2. desulfurization and denitrification integral smoke eliminator according to claim 1 is characterized in that: described demister is provided with running water and cleans shower nozzle.
3. desulfurization and denitrification integral smoke eliminator according to claim 1 and 2, it is characterized in that: enter desulfurization chamber behind the flue gas heating jacket of the described flue gas that enters through being located at tower body top board smoke exhaust pipe periphery, described flue gas after the demister demist is discharged from smoke exhaust pipe after the heating jacket inner chamber on the top board is heated.
4. desulfurization and denitrification integral smoke eliminator according to claim 3 is characterized in that: described aeration tank is provided with agitator and has the aeration tube and the outer comb of desulfurization waste liquor of aeration head, also is provided with the outer comb of denitration waste liquid on the described waste liquid circulatory pool.
CNU2007200060671U 2007-01-12 2007-01-12 Desulfurization denitration integrative smoke purifying device Expired - Lifetime CN201020334Y (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107042033A (en) * 2017-03-28 2017-08-15 鲍守明 Efficient boiler dust-removal and desulfurizing denitrification apparatus
CN107905875A (en) * 2017-12-18 2018-04-13 北京联飞翔科技股份有限公司 A kind of purification of nitrogen oxides device and method
CN108722156A (en) * 2018-06-12 2018-11-02 彭圆 A kind of coke oven flue desulphurization denitration purifier
CN109999589A (en) * 2019-05-24 2019-07-12 鞍山美城城市环境服务有限公司 A kind of coal furnace flue gas emission processing unit and flue gas treating process
CN110180376A (en) * 2019-06-17 2019-08-30 山东山大华特环保工程有限公司 Annular bin dry type fixed bed desulfuring and denitrifying apparatus and flue gas desulfurization and denitration method
JP2019535516A (en) * 2016-11-15 2019-12-12 8 リバーズ キャピタル,エルエルシー Removal of impurities from process streams by contact with oxidants and water streams
CN115634522A (en) * 2022-10-20 2023-01-24 云南曲靖钢铁集团呈钢钢铁有限公司 Environment-friendly energy-saving type deep purification system and method for flue gas of belt type sintering machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019535516A (en) * 2016-11-15 2019-12-12 8 リバーズ キャピタル,エルエルシー Removal of impurities from process streams by contact with oxidants and water streams
CN107042033A (en) * 2017-03-28 2017-08-15 鲍守明 Efficient boiler dust-removal and desulfurizing denitrification apparatus
CN107905875A (en) * 2017-12-18 2018-04-13 北京联飞翔科技股份有限公司 A kind of purification of nitrogen oxides device and method
CN108722156A (en) * 2018-06-12 2018-11-02 彭圆 A kind of coke oven flue desulphurization denitration purifier
CN109999589A (en) * 2019-05-24 2019-07-12 鞍山美城城市环境服务有限公司 A kind of coal furnace flue gas emission processing unit and flue gas treating process
CN110180376A (en) * 2019-06-17 2019-08-30 山东山大华特环保工程有限公司 Annular bin dry type fixed bed desulfuring and denitrifying apparatus and flue gas desulfurization and denitration method
CN110180376B (en) * 2019-06-17 2022-02-01 山东山大华特环保工程有限公司 Dry type fixed bed desulfurization and denitrification device with annular bin
CN115634522A (en) * 2022-10-20 2023-01-24 云南曲靖钢铁集团呈钢钢铁有限公司 Environment-friendly energy-saving type deep purification system and method for flue gas of belt type sintering machine

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