CN102029105B - Double-tower ammonia method desulfuration device and process - Google Patents
Double-tower ammonia method desulfuration device and process Download PDFInfo
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- CN102029105B CN102029105B CN 201110001716 CN201110001716A CN102029105B CN 102029105 B CN102029105 B CN 102029105B CN 201110001716 CN201110001716 CN 201110001716 CN 201110001716 A CN201110001716 A CN 201110001716A CN 102029105 B CN102029105 B CN 102029105B
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Abstract
The invention discloses a double-tower ammonia method desulfuration device which comprises a desulfuration absorption tower, a concentration pump arranged at the bottom of the desulfuration absorption tower and a crystallization pump, wherein the interior of the desulfuration absorption tower is divided into a spraying absorption section for spraying ammonium-containing absorption liquid and a cooling concentration section for cooling an ammonium sulfate solution; the desulfuration device also comprises an oxidation power for oxidizing and concentrating an ammonium sulfite solution into the ammonium sulfate solution; the oxidization tower is connected with the desulfuration absorption tower through a pipeline; a spraying layer is arranged in the spray absorption section in the desulfuration absorption tower; and the oxidation tower is connected with the spraying layer of the desulfuration absorption tower through a primary circulation pump and a secondary circulation pump. The invention also discloses a double-tower ammonia method desulfuration process which has the characteristics of simple flow, high desulfuration ratio, stability of operation, convenience of overhauling and less investment. With the desulfuration absorption tower and the oxidization tower as core devices, the desulfuration device has the advantages of composite multifunction, high absorption efficiency and combined high-efficiency operation of oxidization, concentration and crystallization.
Description
Technical field
The invention belongs to the environmental protection equipment technical field, the flue gas desulfurization technique field that relates to Coal-fired Thermal Power, coal-burning boiler, steel sintering machine, nonferrous metallurgy and chemical building material field relates in particular to a kind of Double-tower ammonia desulfurization device that removes and recycle for the sulfur dioxide to flue gas and the desulphurization technological process that utilizes this device.
Background technology
The industrialization of China and economic construction are fast-developing, SO in the industrial smoke that thereupon brings
2Pollution problem day by day serious, cause the harm of serious acid rain.Although through the Eleventh Five-Year Plan period large-scale flue-gas desulfurizing engineering construction, flue gas desulfurization ability and the installed capacity of China have leapt to the No. 1 in the world,, end 2010, the SO that China every year discharges in the atmosphere
2Still surpass 2,000 ten thousand tons, and along with the demand of China's economic development to the energy and resource, emission source continues to increase, and is discharged into the SO in the atmosphere
2Still the ability that has exceeded atmospheric self-cleaning.Therefore, in " 12 " with in afterwards longer time, China control SO
2The task of discharging and energy-saving and emission-reduction is still very heavy, and larger desulphurization market is arranged.The Eleventh Five-Year Plan period, China is that the engineering reduction of discharging is main, during " 12 ", will progressively be converted to the structure reduction of discharging and have an effect, but the engineering reduction of discharging still is important indispensable reduction of discharging mode.
The primary energy of China is take coal as main, and Coal-fired Thermal Power, coal-burning boiler have discharged a large amount of SO in atmosphere
2, the industries such as other industry such as chemical industry, iron and steel, nonferrous metallurgy, building materials have also been discharged more SO in atmosphere
2, cause atmospheric sulfer seriously polluted.Simultaneously, the poor sulphur of China, annual cost huge fund is from a large amount of sulphur of external import; Even the enterprise of the sulphur of the recovery of newly building up and production was going into operation in recent years, but still can not satisfy the consumption of domestic sulphur.China is large agricultural country, and need a large amount of chemical fertilizer every year, and wherein, ammonium sulfate is a kind of valuable fertilizer.Resources for construction economizing type, environmentally friendly society greatly develop green economy, recycling economy, are the problems that China's present stage development must be faced.Adhere to pursuing development in a scientific way, accelerate transformation of the mode of economic development, actively adjust economy and the industrial structure, enhance the capacity for independent innovation energetically, greatly developing strategic new industry, is that China's socio-economic development was improved the overall national strength to present stage, the inevitable choice of realization sustainable development.Therefore, further examine the development of China's flue gas desulfurization industry closely, active development new technology, optimisation technique kind and the engineering ratio that puts into operation is the new problem that China's flue gas desulfurization industry is faced.
Employing lime/lime stone-gypsum wet technology is taken off in the present flue gas desulfurization of China, although this technology has realized maximization, has that fouling obstruction, accessory substance gypsum are difficult to process, discharging CO
2Etc. problem, and China is plaster of paris big producing country, and the desulfurated plaster of stacking causes secondary pollution.The ammonia process of desulfurization is a kind of resource flue gas desulfurization technique that can reclaim the sulphur resource, the advantages such as, producing ammonium sulfate byproduct chemical fertilizer efficient with its desulfurization, floor space is little, investment is relatively little, be fit to China's national situation, obtained paying close attention to and used widely, realized that just at home technological progress and quickening apply.
In the tradition ammonia desulfuration equipment, scheme commonly used has desulfuration absorbing tower by the integrated single tower Design Mode of absorber portion, enriching section and oxidizing and crystallizing section; Desulfuration absorbing tower is integrated by oxidation panel and absorber portion, and enriching section becomes separately the double tower Design Mode of tower.Under single tower Design Mode, a dividing plate is arranged between enriching section and the oxidation panel, the enriching section concentration of slurry is large, dividing plate place slurry flow rate is low, cause easily the solid clogging, the ammonium sulfate slurries of enriching section flow back to circulating slot certainly by gravity and the equipment discrepancy in elevation usually, also tend to form the solid clogging in the pipeline, affect device and normally move.Adopt absorber portion, oxidation panel integrated (absorption tower) with enriching section (concentration tower) although the double tower Design Mode that separates has solved blockage problem, but owing to increased the flue of being connected between absorption tower and the concentration tower, make flue system more complicated, caused the increase of investment and SR.
Application number 200910068756.9, publication number CN 10159600A, name is called in the Chinese invention patent of the ammonia desulfurizing process that utilizes high potential energy and device, the ammonium sulfate slurries directly enter the slurry pool of desulfuration absorbing tower bottom, avoided the solid obstruction, the oxidation linker that is positioned at the desulfuration absorbing tower outside is provided with oxidation distributor and oxic gas deflector, prolonged oxidization time, improved the oxidation effectiveness of absorption liquid, but its reactant liquor relies on potential energy fully, speed is slow, and oxygen concentration is uneven, and oxidation efficiency is low.
Summary of the invention
In existing ammonia desulfuration equipment, oxidation reaction speed is slow in the oxidation linker, and oxygen concentration is uneven, and the deficiency that oxidation efficiency is low the purpose of this invention is to provide a kind of Double-tower ammonia desulfurization device
And utilize the process of this device desulfurization, it is simple that this technique has flow process, desulfurization degree is high, stable, maintenance is convenient, the characteristics of small investment, desulfuration absorbing tower in this desulfurizer and oxidizing tower are core apparatus, have multi-functional compoundly, absorption efficiency is high, the advantage that oxidation and condensing crystallizing combined highly effective move.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Double-tower ammonia desulfurization device, comprise a desulfuration absorbing tower, be arranged on concentrating pump and the crystallization pump of described desulfuration absorbing tower bottom, be divided into spraying the spray-absorption section that contains the ammonia absorption liquid and the cooling concentration section that is used for cooling off ammonium sulfate in the described desulfuration absorbing tower from top to bottom, described desulfurizer also comprises for the oxidizing tower that the ammonium sulfite solution oxidation is condensed into ammonium sulfate, described oxidizing tower is connected with described desulfuration absorbing tower by pipeline, be provided with spraying layer in the inherent described spray-absorption section of described desulfuration absorbing tower, described oxidizing tower is connected with the spraying layer of described desulfuration absorbing tower with the secondary circulating pump by the one-level circulating pump.
Further, it also comprises an agitator, and described agitator is arranged at the bottom of the cooling concentration section of described desulfuration absorbing tower.
Further, described desulfuration absorbing tower is provided with the packing layer that is positioned at above the described spraying layer in described spray-absorption section.
Further, described desulfuration absorbing tower in described spray-absorption section, be provided be positioned at above the described packing layer except the fog-zone, describedly comprise a demister except the fog-zone.
Further, described spraying layer is divided into one-level spraying layer and secondary spraying layer, and described one-level spraying layer is comprised of 1 to 4 layer of spray equipment, and described secondary spraying layer is comprised of 1 to 3 layer of spray equipment, described one-level spraying layer is connected with the one-level circulating pump, and described secondary spraying layer is connected with the secondary circulating pump.
Further, be provided with aeration tube in the described oxidizing tower, described aeration tube is connected with the blower fan of delivering oxygen in described oxidizing tower.
Further, also be provided with for the equally distributed phegma distributor of ammonium bisulfite that will reflux in the described desulfuration absorbing tower in the described oxidizing tower and be arranged on the air and liquid mixer that described phegma distributor below is used for oxidation.
Further, the top of the cooling concentration section of described desulfuration absorbing tower also is provided with a liquefied ammonia ascending pipe, and described oxidizing tower top also is provided with a liquefied ammonia ascending pipe.
The present invention also provides a kind of double tower ammonia desulfurizing process method, comprises the steps:
Step 1: the cooling concentration section that flue gas enters desulfuration absorbing tower through former smoke inlet, react with ammonia spirit and ammonium sulfite solution in the tower, generate ammonium sulfite with the ammonia spirit reaction, generate ammonium bisulfite with the ammonium sulfite solution reaction;
Step 2: the flue gas through step 1 continues to flow to the desulfuration absorbing tower top, enters the spray-absorption section, and flue gas is removed SO through one-level spraying layer and secondary spraying layer successively
2, continuation is upwards flowed through packing layer with except the fog-zone, removes the fog of ammonia mist, ammonium sulfite and ammonium bisulfite in the flue gas, and the clean exhanst gas outlet on desulfuration absorbing tower enters atmosphere;
Step 3: the bisulfite ammonium salt solution that generates through step 1 is sent into by pipeline and is carried out oxidation in the oxidizing tower, a part of ammonium sulfite solution that oxidation generates enters the one-level spraying layer of spray-absorption section through the one-level circulating pump, and another part ammonium sulfate that oxidation generates enters the secondary spraying layer of spray-absorption section through the secondary circulating pump;
Step 4: pass back into by the road in the cooling concentration section of desulfuration absorbing tower through the ammonium sulfate that step 3 accumulates in oxidizing tower, and carrying out condensing crystallizing through the top that concentrating pump is sent into the cooling concentration section, the ammonium sulfate slurries of cooling concentration section bottom are pumped into the ammonium sulfate production system through crystallization and produce the ammonium sulfate finished product.
In this patent, the flue gas running route is as follows: flue gas is through behind the flue gas system, enters desulfuration absorbing tower in the middle and upper part of the cooling concentration section of desulfuration absorbing tower, reacts with ammonia spirit and ammonium sulfite solution in the tower; Wherein, generate ammonium sulfite with the ammonia spirit reaction, generate ammonium bisulfite with the ammonium sulfite solution reaction; SO in the flue gas
2After being removed, the SO in the flue gas
2Concentration reduces, and flue gas further upwards flows, and enters the epimere of desulfuration absorbing tower by the intersegmental gas cap of cooling concentration section and spray-absorption, it is the spray-absorption section, further with solution in ammoniacal liquor and sulfurous acid ammonia react, generate ammonium bisulfite, flue gas is further purified; In the spray-absorption section, flue gas passes through one-level spraying layer and secondary spraying layer, SO successively
2Be removed, then continue to make progress through packing layer with except the fog-zone, remove the fog of ammonia mist, ammonium sulfite and ammonium bisulfite in the flue gas, the exhanst gas outlet district on the absorption tower discharges, and the process air-introduced machine enters atmosphere.
The absorption liquid circulation route is as follows: the absorption liquid of desulfuration absorbing tower epimere spray-absorption section, and through absorbing SO
2And reaction, generated a large amount of ammonium bisulfites, send into oxidizing tower through pipeline and carry out oxidation, after process ammonia reduces in oxidizing tower, easier oxidation; After the oxidizing tower oxidation, a part of solution enters the one-level spraying layer of spray-absorption section through the one-level circulating pump, is mainly ammonium sulfite solution; Another part solution enters the secondary spraying layer of spray-absorption section through the secondary circulating pump, is mainly ammonium sulfate.
Ammonium sulfate and ammonium sulfate finished product route are as follows: solution in the desulfuration absorbing tower through with flue gas in SO
2Reaction, in oxidizing tower, accumulated the ammonium sulfate of high concentration, relied on deadweight, through pipeline, oxidizing tower is included the cooling concentration section that the higher solution of ammonium sulfate concentrations passes back into the desulfuration absorbing tower hypomere, send into the cooling concentration section top of desulfuration absorbing tower through concentrating pump and carry out condensing crystallizing; The ammonium sulfate slurries of the cooling concentration section bottom of desulfuration absorbing tower hypomere are pumped into the ammonium sulfate production system through crystallization and produce the ammonium sulfate finished product.
Main technological features and the flow process of patent of the present invention are as follows:
The ammonia desulfurizing process that this patent designs for double tower, whole desulphurization system is divided into desulfuration absorbing tower and oxidizing tower.Desulfuration absorbing tower is divided into two sections, and top is desulfuration absorbing tower spray-absorption section, and the bottom is desulfuration absorbing tower cooling concentration section.The major function of desulfuration absorbing tower cooling concentration section is the high-temperature flue gas adiabatic evaporation cooling that will enter in the desulfuration absorbing tower, simultaneously dilute sulfuric acid ammonium concentrate is formed the ammonium sulfate slurries of certain solid holdup.The major function of desulfuration absorbing tower spray-absorption section is the sulfur dioxide in the ammonium sulfite absorption flue gas that utilizes in the absorption liquid, reaches desulfurized effect, removes simultaneously the water smoke in the flue gas after absorbing.
Former flue gas from former flue comes enters desulfuration absorbing tower cooling concentration section, enters desulfuration absorbing tower spray-absorption section after the ammonium sulfate slurries cooling that the concentrating pump with setting bottom desulfuration absorbing tower cooling concentration section comes.To be ammonium sulfite solution carry out the absorption cleaning reaction in the one-level spraying layer in the desulfuration absorbing tower for former flue gas and the main component of being brought by the one-level circulating pump, the main component that the secondary circulating pump brings is that ammonium sulfate sprays into from the secondary spraying layer, plays the generation that reduces the escaping of ammonia phenomenon.The one section packing layer of smoke gas flow after the purification in being arranged on desulfuration absorbing tower reduced the escape of ammonia, finally by entering atmosphere except the fog-zone demist by chimney.
With SO in the flue gas
2Reacted slurries contain a large amount of ammonium bisulfites, rely on self gravitation to pass back into uniformly the oxidizing tower from the phegma distributor of oxidizing tower inside, the air of sending into oxidation fan carries out forced oxidation through aeration tube, the air and liquid mixer of design plays the function of oxidation efficient in the oxidizing tower, most of absorption liquid after the oxidation continues to participate in absorption reaction after mending ammonia, another part is back to desulfuration absorbing tower cooling concentration section bottom, sends into desulfuration absorbing tower cooling concentration section top through concentrating pump and carries out condensing crystallizing.The ammonium sulfate slurries of desulfuration absorbing tower bottom are pumped into the ammonium sulfate production system through crystallization.Gather for the sedimentation that prevents desulfuration absorbing tower cooling concentration section bottom slurries, in the desulfuration absorbing tower sidewall design one cover side-feeding mixer is arranged, prevent that the phenomenon of slurry mud deposition from appearring in the desulfuration absorbing tower bottom.
The effect of this patent is:
1) the ammonium sulfate slurries after this device concentrates directly enter the slurry pool of desulfuration absorbing tower bottom, have cancelled ammonium sulfate slurries gravity line, and the problem of having avoided solid to stop up has guaranteed that device normally moves.
2) this device for prolonging the time of staying of ammonium sulfate slurries in desulfuration absorbing tower after concentrated, increased the chance that ammonium sulfate is grown up.
3) this device adopts Double-Tower Structure, oxidizing tower is set separately the ammonium sulfite solution oxidation is condensed into ammonium sulfate, owing to do not carry out oxidation in desulfuration absorbing tower, the desulfuration absorbing tower height that therefore adopts is lower, has reduced circulation pump lift and energy consumption.
4) be designed with air and liquid mixer in this device oxidizing tower, additional NH
3Along with the reaction of the ammonium bisulfite in the solution in oxygen and the oxidizing tower contacts more even, be difficult for producing local concentration phenomenon bigger than normal, make that ammonium bisulfite concentration significantly reduces in the absorption liquid, ammonium sulfite concentration increases, improved desulfuration efficiency, because ammonium bisulfite stability than ammonium sulfate poor stability, has also reduced the decomposition of ammonium bisulfite in the absorption tower, reduce the escaping of ammonia phenomenon simultaneously.
5) this device is imported and exported flue and is connected all on desulfuration absorbing tower in engineering is used, and has reduced SR and simple and reliable.
Adopt this technological process and device, the SO in can the efficient absorption flue gas
2, to produce and obtain high-quality ammonium sulfate product, effusion ammonia is few in the outlet flue gas, and ammonium sulfate and ammonium sulfite aerosol load are low, save equipment investment and operating cost, have larger engineering and use and industrialization value.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples;
Fig. 1 is apparatus structure of the present invention and process flow diagram;
The number in the figure explanation:
1-desulfuration absorbing tower 2-cooling concentration section 3-spray-absorption section 4-oxidizing tower
5-crystallization pump 6-blower fan 7-one-level circulating pump 8-secondary circulating pump 9-concentrating pump
The clean exhanst gas outlet 32-of the former smoke inlet 22-of 21-agitator 31-one-level spraying layer
33-secondary spraying layer 34-packing layer 35-is except the fog-zone
41-aeration tube 42-air and liquid mixer 43-phegma distributor
The specific embodiment
In conjunction with Fig. 1 Double-tower ammonia desulfurization device of the present invention is described, desulfurizer is divided into desulfuration absorbing tower 1 and oxidizing tower 4, desulfuration absorbing tower 1 is followed successively by cooling concentration section 2 and spray-absorption section 3 from bottom to up, separates by inner member between the two, and connects by gas cap.Cooling concentration section 2 tops arrange former smoke inlet 21, and spray-absorption section 3 tops arrange clean exhanst gas outlet 31.The major function of cooling concentration section 2 is the high-temperature flue gas adiabatic evaporation coolings that will enter in the desulfuration absorbing tower 1, simultaneously dilute sulfuric acid ammonium concentrate is formed the ammonium sulfate slurries of certain solid holdup.The major function of spray-absorption section 3 is the SO in the ammonium sulfite absorption flue gas that utilizes in the absorption liquid
2, reach desulfurized effect, remove simultaneously the water smoke in the flue gas after absorbing.
Cooling concentration section 2 is a district.Spray-absorption section 3 is divided into five districts, is followed successively by from bottom to up uptake zone, one-level spraying layer 32, secondary spraying layer 33, packing layer 34 and removes fog-zone 35, between each district the gas cap that passes through for flue gas is only arranged.One-level spraying layer 32 is comprised of 1～4 layer of spray equipment, and flue gas and liquefied ammonia, ammonium sulfite reaction are carried out desulfurization and absorbed, and are mainly the ammonium sulfite solution that one-level circulating pump 7 brings in the one-level spraying layer 32, are to remove SO
2The key reaction space, generate ammonium bisulfite.Secondary spraying layer 33 is comprised of 1～3 layer of spray equipment, in the absorption liquid with SO remaining in ammonium sulfite and the flue gas
2Reaction is main, continues desulfurization, and secondary spraying layer 33 is interior mainly to be the ammonium sulfate that secondary circulating pump 8 brings, and when continuing reaction desulfuration, mainly plays the effect that reduces the escaping of ammonia.The interface of one-level spraying layer 32 and secondary spraying layer 33 with link to each other with lower floor mist eliminator flushing water pipe except the upper strata mist eliminator flushing water pipe in the fog-zone 35, significantly reduce the ammonia rate of escaping.Each district finishes respectively SO in the flue gas
2The removal of first absorption, double absorption and absorption liquid droplet.The circulation of absorption liquid and ammonium sulfate liquid is finished by one-level circulating pump 7, secondary circulating pump 8, concentrating pump 9 and crystallization pump 5 with conveying in the device.Desulfuration absorbing tower 1 also comprises annotates the ammonia pipe, and liquefied ammonia is injected from the bottom of one-level spraying layer 32 and the top of cooling concentration section 2.
The sidewall of cooling concentration section 2 bottoms is provided with a cover side-feeding mixer 22, prevents that the phenomenon of slurry mud deposition from appearring in desulfuration absorbing tower 1 bottom.In the cooling concentration section 2, liquefied ammonia injects rear and the ammonium bisulfite reaction, and the reduction ammonium bisulfite is ammonium sulfite.Simultaneously, the ammonium sulfate that generates in the interior oxidations of oxidizing tower 4 flows into the cooling concentration section 2 of desulfuration absorbing tower 1 hypomere by pipeline, through cooling down and concentrating and precipitating, is deposited as the high-concentration sulfuric acid ammonium salt solution in the bottom, and has the part of sulfuric acid crystalline ammonium to separate out.The solution of cooling concentration section circulates through enriching section, realizes that solution is further concentrated, and ammonium sulfate is discharged by discharge pipe and circulating pump, and a part enters circulation, and another part enters the ammonium sulfate production operation, produces ammonium sulfate product.Thereby in an absorption combination tower, finish SO in the flue gas
2The conversion of absorption, ammonium sulfite and bisulfite ammonium salt solution and regeneration, ammonium sulfate cooling concentration and a plurality of functions of removing the absorption liquid droplet.
Oxidizing tower 4 is gas-liquid contact reactor, and inside arranges aeration tube 41, air and liquid mixer 42 and phegma distributor 43, by blower fan 6 oxidation air is passed into oxidizing tower 4, and under catalytic action, ammonium sulfite solution is oxidized to ammonium sulfate.Oxidizing tower 4 arranges annotates the ammonia pipe, injects liquefied ammonia or ammoniacal liquor, with the ammonium sulfite solution reduction, and decomposition and the escaping of ammonia of accelerating oxidation and inhibition sodium sulfite hydrogen ammonium; Oxidizing tower 4 is connected with a plurality of pipe interfaces, realizes the function of Flow of Goods and Materials and exchange.Be connected with oxidation air pipe, solution discharge pipe in the bottom, pass into oxidation air and discharge solution circulation and enter desulfuration absorbing tower 1, the solution that is connected with desulfuration absorbing tower 1 at the middle part enters pipe and solution discharge pipe, mainly with concentrated ammonium sulfate solution inlet and outlet desulfuration absorbing tower 1, be connected with the solution inlet tube at oxidizing tower 4 tops, the solution that flows out from desulfuration absorbing tower 1 enters oxidizing tower 4.
In conjunction with Fig. 1 double tower ammonia desulfurizing process flow process of the present invention is described again, the flue gas that enters from former smoke inlet 21, enter the cooling concentration section 2 of desulfuration absorbing tower 1, enter the uptake zone of spray-absorption section 3 after jointly lowering the temperature with the ammonium sulfate slurries of concentrating pump 9 introducings that arranged by the bottom.Flue gas and the main component of being brought by one-level circulating pump 7 are that the solution of ammonium sulfite carries out the absorption cleaning reaction in one-level spraying layer 32, the main component that secondary circulating pump 8 brings is that the solution of ammonium sulfate sprays into from secondary spraying layer 33, plays the generation that reduces the escaping of ammonia phenomenon.Smoke gas flow after the purification has further reduced the escape of ammonia through packing layer 34, finally by entering atmosphere except after 35 demists of fog-zone by clean exhanst gas outlet 31.With SO in the flue gas
2Reacted slurries contain a large amount of ammonium bisulfites, rely on self gravitation evenly to pass back into the oxidizing tower 4 from the phegma distributor 43 of oxidizing tower 4 inside, the air of being sent into by blower fan 6 carries out forced oxidation through aeration tube 41, air and liquid mixer 42 plays the function of oxidation efficient, most of absorption liquid after the oxidation continues to participate in absorption reaction after mending ammonia, another part is back to the bottom of desulfuration absorbing tower 1 cooling concentration section 2, sends into cooling concentration section 2 tops through concentrating pump 9 and carries out condensing crystallizing.The ammonium sulfate slurries of cooling concentration section 2 bottoms are sent into the ammonium sulfate production system through crystallization pump 5.
Embodiment is as follows: the flue gas 100 * 10 that will be from boiler temperature 120 ℃
4Nm
3/ h, SO in the flue gas
2Concentration is 2000ppm, after flue gas enters desulfuration absorbing tower, contacts with absorption liquid, begins cooling, and part reaction occurs; Flue gas further rises, and from the spray-absorption section that the cooling concentration section enters epimere, is down to about 60 ℃～70 ℃ in spray-absorption section flue-gas temperature, and the ammonium sulfite reaction with in the absorption liquid generates ammonium bisulfite; Flue gas further rises through the one-level spraying layer, continues reaction, the SO in the flue gas
2Further remove; When arriving through the second spraying layer, the SO in the flue gas
2Removal efficiency reaches designing requirement substantially; Flue gas continues to pass through exhanst gas outlet through packing layer with except the fog-zone.
The absorption liquid of desulfuration absorbing tower spray-absorption section is with the SO in the flue gas
2After the reaction, flow into oxidizing tower through pipeline.With flue gas in SO
2Reacted slurries contain a large amount of ammonium bisulfites, rely on self gravitation to pass back into uniformly the oxidizing tower from the phegma distributor of oxidizing tower inside, the air of sending into oxidation fan carries out forced oxidation through aeration tube, the air and liquid mixer that arranges in the oxidizing tower plays the function of oxidation efficient, most of absorption liquid after the oxidation continues to participate in absorption reaction after mending ammonia, another part is back to desulfurizing tower cooling concentration section bottom, sends into desulfurizing tower cooling concentration section top through concentrating pump and carries out condensing crystallizing.The ammonium sulfate slurries of desulfurizing tower bottom are pumped into the ammonium sulfate production system through crystallization.
Those skilled in the art will recognize that; the above-mentioned specific embodiment is exemplary; in order to make those skilled in the art can better understand this patent content; should not be understood as the restriction to this patent protection domain; change or modify so long as disclose spiritual any being equal to of doing according to this patent, all fall into this patent protection domain.
Claims (6)
1. Double-tower ammonia desulfurization device, comprise a desulfuration absorbing tower (1), be arranged on concentrating pump (9) and the crystallization pump (5) of described desulfuration absorbing tower (1) bottom, be divided into spraying the spray-absorption section (3) that contains the ammonia absorption liquid in the described desulfuration absorbing tower (1) from top to bottom and be used for cooling off the cooling concentration section (2) of ammonium sulfate, it is characterized in that:
Described desulfurizer also comprises for the oxidizing tower (4) that the ammonium sulfite solution oxidation is condensed into ammonium sulfate, described oxidizing tower (4) is connected with described desulfuration absorbing tower (1) by pipeline, be provided with spraying layer in the inherent described spray-absorption section of described desulfuration absorbing tower (1) (3), described oxidizing tower (4) is connected with the spraying layer of secondary circulating pump (8) with described desulfuration absorbing tower (1) by one-level circulating pump (7);
Also be provided with in the described oxidizing tower (4) for will and being arranged on the air and liquid mixer that described phegma distributor (43) below is used for oxidation from the interior equally distributed phegma distributor of ammonium bisulfite (43) that refluxes of described desulfuration absorbing tower (1);
The top of the cooling concentration section (2) of described desulfuration absorbing tower (1) also is provided with a liquefied ammonia ascending pipe, and described oxidizing tower (4) top also is provided with a liquefied ammonia ascending pipe;
Described desulfuration absorbing tower (1) is provided with the packing layer (34) that is positioned at described spraying layer top in described spray-absorption section (3).
2. Double-tower ammonia desulfurization device according to claim 1, it is characterized in that: it also comprises an agitator (22), described agitator (22) is arranged at the bottom of the cooling concentration section (2) of described desulfuration absorbing tower (1).
3. Double-tower ammonia desulfurization device according to claim 1, it is characterized in that: described desulfuration absorbing tower (1) in described spray-absorption section (3), be provided be positioned at described packing layer (34) top except fog-zone (35), describedly comprise a demister except fog-zone (35).
4. Double-tower ammonia desulfurization device according to claim 1, it is characterized in that: described spraying layer is divided into one-level spraying layer (32) and secondary spraying layer (33), described one-level spraying layer (32) is comprised of 1 to 4 layer of spray equipment, described secondary spraying layer (33) is comprised of 1 to 3 layer of spray equipment, described one-level spraying layer (32) is connected with one-level circulating pump (7), and described secondary spraying layer (33) is connected 8 with the secondary circulating pump) connect.
5. according to claim 1 to the described Double-tower ammonia desulfurization device of 4 arbitrary claims, it is characterized in that: be provided with aeration tube (41) in the described oxidizing tower (4), described aeration tube (41) is connected with blower fan (6) to the interior delivering oxygen of described oxidizing tower (4).
6. a double tower ammonia desulfurizing process method is characterized in that, comprises the steps:
Step 1: flue gas enters the cooling concentration section (2) of desulfuration absorbing tower (1) through former smoke inlet (21), react with ammonia spirit and ammonium sulfite solution in the tower, generate ammonium sulfite with the ammonia spirit reaction, generate ammonium bisulfite with the ammonium sulfite solution reaction;
Step 2: the flue gas through step 1 continues to flow to desulfuration absorbing tower (1) top, enters spray-absorption section (3), and flue gas passes through successively one-level spraying layer (32) and secondary spraying layer (33) is removed SO
2, continuation is upwards flowed through packing layer (34) with except fog-zone (35), removes the fog of ammonia mist, ammonium sulfite and ammonium bisulfite in the flue gas, and the clean exhanst gas outlet (31) on desulfuration absorbing tower (1) enters atmosphere;
Step 3: the bisulfite ammonium salt solution that generates through step 1 is sent into by pipeline in the oxidizing tower (4) and is carried out oxidation, a part of ammonium sulfite solution that oxidation generates enters the one-level spraying layer (32) of spray-absorption section (3) through one-level circulating pump (7), and another part ammonium sulfate that oxidation generates enters the secondary spraying layer (33) of spray-absorption section (3) through secondary circulating pump (8);
Step 4: pass back into by the road in the cooling concentration section (2) of desulfuration absorbing tower (1) through the ammonium sulfate that step 3 accumulates in oxidizing tower (4), and carrying out condensing crystallizing through the top that concentrating pump (9) is sent into cooling concentration section (2), the ammonium sulfate slurries of cooling concentration section (2) bottom are sent into the ammonium sulfate production system through crystallization pumps (5) and are produced the ammonium sulfate finished product.
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| CN102974185B (en) * | 2012-11-29 | 2014-12-10 | 上海龙净环保科技工程有限公司 | Modularized integrated smoke purification system and method for removing plurality of pollutants |
| CN105771591A (en) * | 2016-01-27 | 2016-07-20 | 西安航天源动力工程有限公司 | Graded tower internal crystallization ammonia-process desulfurization method |
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| CN111482072B (en) * | 2019-01-28 | 2024-03-29 | 南京定环新能源科技有限公司 | Upper desulfurization liquid collecting disc of absorption section of absorption tower in ammonia desulfurization |
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| CN111111413B (en) * | 2020-01-13 | 2022-04-29 | 江苏远东环保工程有限公司 | Desulfurization system and process for ultralow emission of waste gas in carbon black industry |
| CN111573695A (en) * | 2020-04-09 | 2020-08-25 | 浙江省天正设计工程有限公司 | Recycling treatment process for high-concentration organic wastewater containing phosphorus and sulfur |
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| CN101422693A (en) * | 2008-11-24 | 2009-05-06 | 贵州开磷（集团）有限责任公司 | Sulphuric acid tail-gas deep desulfurization method |
| CN101601964B (en) * | 2009-06-03 | 2012-01-11 | 李鹏举 | Ammonia flue gas desulfurization device |
| CN201930705U (en) * | 2011-01-06 | 2011-08-17 | 上海克硫环保科技股份有限公司 | Double-tower ammonia desulfurization device |
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