CN101601964A - A kind of high-efficiency ammonia flue gas desulfurization technique and device - Google Patents
A kind of high-efficiency ammonia flue gas desulfurization technique and device Download PDFInfo
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- CN101601964A CN101601964A CNA2009101460463A CN200910146046A CN101601964A CN 101601964 A CN101601964 A CN 101601964A CN A2009101460463 A CNA2009101460463 A CN A2009101460463A CN 200910146046 A CN200910146046 A CN 200910146046A CN 101601964 A CN101601964 A CN 101601964A
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Abstract
A kind of high-efficiency ammonia flue gas desulfurization technique of the present invention and device are with SO
2Absorption, ammonium sulfate condensing crystallizing and demist process are finished in the absorption tower, SO in the tower
2Absorb and adopt eddy flow plate and spraying layer compound mode, eddy flow plate, flap, silk screen combined defroster are adopted in demist, and tower is provided with oxidation trough outward.Utilize tower height temperature flue gas thermal source to carry out the ammonium sulfate evaporating, concentrating and crystallizing, gas approach is provided with heat exchanger and adds hot-air, utilizes the blower fan conveying to add hot-air the ammonium sulfate drying source is provided, and reduces crystallization, energy consumption for drying.This sulfur removal technology has that desulfuration efficiency height, operating cost are low, accessory substance ammonium sulfate can fully utilize characteristics.
Description
Technical field
The described flue gas desulfurization technique that belongs to of patent of the present invention is a kind of wet ammonia method for flue gas desulfurizing technology and device specifically.
Technical background
Sulfur dioxide is one of current atmosphere pollution major pollutants, flue gas desulfurization is very urgent, the flue gas desulfurization technique of domestic present main flow is based on the calcium method, but calcium method desulfur technology accessory substance gypsum easily produces secondary pollution and captures problems such as land resource mainly based on landfill.
Ammonia-process desulfurization technique is to adopt ammonia or deposed ammonia as desulfurizing agent and the final sulfur removal technology that generates ammonium sulfate of sulfur dioxide in flue gas reaction.The amino SO that absorbs
2Speed and efficient all be higher than the calcium base, desulfuration efficiency reaches more than 95%, and liquid-gas ratio is low, power consumption is low, desulfurizing byproduct ammonium sulfate value height if desulfurizing agent utilizes deposed ammonia, can reach the treatment of wastes with processes of wastes against one another, realizes resource circulation utilization.But be to use ammonia desulfurizing process still to have problems: dry electricity or Steam Heating mode, the consumes energy of adopting of sulfate of ammoniac crystal; Demister adopts folded plate type, is difficult to remove 0.01～10 μ m ammonia aerosols, has the escaping of ammonia problem, causes secondary pollution, and these problems have all restricted the development of ammonia-process desulfurization technique.
Summary of the invention
A kind of ammonia flue gas desulfurization technique of the present invention and device utilize ammoniacal liquor or liquefied ammonia to make desulfurizing agent to absorb SO in the flue gas
2, end product is an ammonium sulfate.Whole desulphurization system comprises devices such as absorption tower, crystallization tank, agitator, circulating pump, oxidation trough, aerator, oxidation fan, ammonia storage tank, ammonia transfer pump, blender, inspissator, dewaterer, drier, heat exchanger.
The absorption tower hypomere of this process system is a crystallization tank, and the crystallization tank top is provided with the cooling spraying layer, and the crystallization cell wall is communicated with gas approach, and the stage casing, absorption tower is SO
2Absorber portion, be provided with spiral-flow type and absorb distribution grid and spraying layer combination absorber portion, the absorption tower epimere is the demist section, adopt eddy flow plate, flap and silk screen combined defroster, wherein spiral-flow type absorption distribution grid is made up of dividing plate, a plurality of rising tube and eddy flow plate, the rounded even distribution of rising tube, the dividing plate percent opening is 40～80%, allows flue gas to pass through.At first enter the crystallization tank on absorption tower through the flue gas after dust removal process and the heat exchange, by crystallization tank ammonium sulfate cooling spraying layer, flue-gas temperature drops to 50 ℃～70 ℃, not only effectively reduce flue-gas temperature by crystallization tank, the heat that can make full use of high-temperature flue gas simultaneously carries out evaporating, concentrating and crystallizing to ammonium sulfate, greatly reduce the energy consumption of evaporation and concentration, humidity of flue gas increases, enter the eddy flow plate, spraying layer combination absorber portion, at first pass through crystallization tank top eddy flow distribution grid, rotation is risen under the guide effect of column plate blade, the absorption spray liquid spins off from aqueous vapor and is thrown toward around the cylindrical shell under action of centrifugal force, realize gas, liquid separates buffer action, arranges that simultaneously eddy flow plate face liquid film improves SO
2Mass-transfer efficiency is provided with 3 layers of spray equipment at the spray absorber portion, and absorption liquid contacts washing with flue gas adverse current, finish SO
2Absorb.SO in the flue gas
2Generated bisulfite ammonia with ammonium sulfite reaction in the absorption liquid, absorption liquid is pooled to the gravity flow of eddy flow plate distribution grid bottom and enters the outer oxidation trough of tower.Be provided with on spraying layer top, absorption tower that eddy flow is board-like, flap, silk screen combined defroster and flusher, can effectively remove its drop that carries and part ammonium salt aerosol during flue gas process combined defroster, flusher sprays clear water and can effectively remove the ammonia that carries in the flue gas and ammonium salt aerosol and demister is washed, prevent its fouling obstruction, utilize eddy flow plate gas-liquid isolation features simultaneously, compile flushing, shower water from flowing into the fresh water (FW) case, recycling through the technology water pump, when descending, replenishes cistern water level fresh water (FW).By discharging from the exhanst gas outlet at top, absorption tower after the combined defroster than clean flue gas.
The ammonia storage tank is annotated ammonia by the ammonia transfer pump to absorbing spraying layer and blender, and the addition of ammonia is controlled by the absorption liquid pH value, and keeping oxidation trough pH is 5～6, and blender pH is 6～7.
Absorption tower external oxidation groove absorption liquid enters spraying layer washing flue gas by circulating pump, in the oxidation trough bottom aerator is set, and is connected with oxidation fan, and constantly aeration is an ammonium sulfate with sulfite oxidation wherein, and control spraying layer absorption liquid pH is 4～6.Absorption liquid is handled by delivery pump to crystallization tank condensing crystallizing in the oxidation trough.
The crystallization tank bottom is provided with agitating device, crystallization tank is provided with crystallisation cycle pump and slurries drawing pump outward, crystallisation cycle pump discharge pipeline connects with the nozzle of cooling spray, the crystallisation cycle pump makes ammonium sulfate repeatedly contact with high-temperature flue gas, after reaching finite concentration, the ammonium sulfate of process crystallization treatment is delivered to blender by the slurries drawing pump, the pH value of ammonium sulfate saturated solution is regulated in ammonification in blender, helps reducing the acid content of ammonium sulfate products, improves the quality of ammonium sulfate product.The ammonium sulfate slurries are delivered to inspissator through blender and carry out concentration, it is recycling that the top flow liquid is back to the absorption liquid oxidation trough, the bottom concentrate enters dewaterer and carries out processed, the dewaterer filter liquor is back to oxidation trough and carries out recyclingly, makes the ammonium sulfate finished product by the further drying of drier at last through the ammonia sulfate crystal of processed.Heat exchanger (23) is set on the gas approach of absorption tower, and blower fan (24), heat exchanger (23) are connected in series by pipeline with drier (22), and blower fan carries air to heat exchanger, provide hot blast to drier after the high-temperature flue gas heating.
Ammonia flue gas desulfurization technique of the present invention and device are because the employing absorption tower is provided with the eddy flow plate and spraying layer combined type absorber portion makes full use of eddy flow plate and spray advantage, SO
2Absorption efficiency improves, and liquid-gas ratio reduces, and power consumption decreases.Demister adopts eddy flow plate, flap, silk screen compound mode in the tower, effectively removes and carries drop and ammonia aerosols in the flue gas, has avoided the escaping of ammonia phenomenon of outlet flue gas.The spray equipment of crystallization inside tower groove with advance tower height temperature flue gas and contact washing, utilize the high-temperature flue gas thermal source to carry out the ammonium sulfate evaporating, concentrating and crystallizing, gas approach is provided with heat exchanger, and the blower fan conveying adds hot-air provides the ammonium sulfate drying source, reduces crystallization, energy consumption for drying.
Description of drawings
Fig. 1 is the structural representation of process flow diagram of the present invention and device.
Among the figure: the 1-absorption tower; The 2-crystallization tank; The 3-spraying layer of lowering the temperature; The 4-spiral-flow type absorbs distribution grid; 5-absorbs spraying layer; 6-spiral-flow type demist distribution grid; 7-flap demister; The 8-mesh mist eliminator; The 9-agitator; 10-crystallisation cycle pump; The 11-oxidation trough; The 12-absorbent recirculation pump; The 13-aerator; The 14-oxidation fan; The 15-delivery pump; 16-ammonia storage tank; 17-ammonia transfer pump; 18-slurries drawing pump; The 19-blender; The 20-inspissator; The 21-dewaterer; The 22-drier; The 23-heat exchanger; The 24-blower fan; 25-technology water tank; 26-technology water pump.
The specific embodiment
Introduce the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
This technology is used for coal burning flue gas desulfurization.As shown in Figure 1,130～160 ℃ high-temperature flue gas enters bottom, absorption tower (1) crystallization tank (2) behind heat exchanger (23), contact washing with cooling spraying layer (3) ammonium sulfate, flue-gas temperature drops to 50 ℃～70 ℃, simultaneously ammonium sulfate is carried out evaporating, concentrating and crystallizing, enter middle part, absorption tower (1) again and spiral-flow type absorption distribution grid (4) is set and absorbs spraying layer (5) combination absorber portion, finish SO
2Washing absorbs, enter top, absorption tower (1) afterwards spiral-flow type demist distribution grid (6), flap demister (7), mesh mist eliminator (8) combination demister are set, remove its drop that carries and part ammonium salt aerosol, after absorption tower (1) top exit flue enters atmosphere.
Absorption tower external oxidation groove (11) absorption liquid is delivered to by absorbent recirculation pump (12) and absorbs spraying layer (5), absorbs spraying layer (5) and is provided with 3 layers of spray equipment.
Absorption tower intercrystalline groove (2) cleaning solution is delivered to cooling spraying layer (3) by crystallisation cycle pump (10), and cooling spraying layer (3) is provided with 1 layer of spray equipment.
Combined defroster provides flushing, spray water source by technology water pump (26), and flushing, shower water compile through the board-like demister of eddy flow (6) that to flow into technology water tank (25) recycling, additional fresh water (FW) when water level drops to 1 meter technology water tank (25) in.
Flue gas is finished SO in absorption tower (1)
2After the absorption, ammonium sulfite and SO in the absorption liquid
2Reaction has generated bisulfite ammonia, absorption liquid is pooled to the gravity flow of eddy flow plate distribution grid (4) bottom and enters the outer oxidation trough (11) of tower, in oxidation trough (11) bottom aerator (13) is set, be connected with oxidation fan (13), constantly aeration is an ammonium sulfate with sulfite oxidation wherein, pH is 4～6 in control, and absorption liquid carries out the condensing crystallizing processing by delivery pump (15) to crystallization tank (2) in the oxidation trough (13).
Crystallization tank (2) bottom is provided with agitator (9), reach after the supersaturation by taking out slurries to go out pump (18) and be delivered to blender (19) through the ammonium sulfate of crystallization treatment, to regulate the pH value of ammonium sulfate saturated solution be to be delivered to inspissator (20) after 6～7 to carry out concentration in ammonification in blender, the bottom concentrate enters dewaterer (21) and carries out processed, it is recycling that dewaterer (21) filter liquor and inspissator (20) top flow liquid are back to absorption liquid oxidation trough (11), ammonia sulfate crystal through processed makes the ammonium sulfate finished product by the further drying of drier (22) at last, and drier (22) hot blast utilizes the high-temperature flue gas thermal source (to provide after 23 heating through heat exchanger by blower fan (24) air blast.
Ammonia storage tank (16) is annotated ammonia by ammonia transfer pump (17) to absorbing spraying layer (5) and blender (19), and the addition of ammonia is controlled by the absorption liquid pH value, and keeping oxidation trough pH is 5～6, and blender pH is 6～7.
Claims (2)
1. high-efficiency ammonia flue gas desulfurization technique and device, it is characterized in that: adopting bottom, absorption tower (1) is crystallization tank (2), crystallization tank (2) top is provided with cooling spraying layer (3), crystallization tank (2) sidewall is provided with agitator (9), and be communicated with gas approach, cooling spraying layer (3) top is provided with spiral-flow type and absorbs distribution grid (4), this spiral-flow type absorbs distribution grid (4) and absorbs spraying layer (5) combination absorber portion, absorber portion top is provided with spiral-flow type demist distribution grid (6), flap demister (7), mesh mist eliminator (8) combination demister, top, absorption tower and exhaust pass UNICOM.Crystallization tank (2), crystallisation cycle pump (10), cooling spraying layer (3) is connected in series by pipeline, combination demister flusher is by pipeline and technology water pump (26), technology water tank (25) connects, spiral-flow type demist distribution grid (6) overflow pipe is connected by pipeline with technology water tank (25), spiral-flow type absorbs distribution grid (4) overflow pipe and is connected by pipeline with oxidation trough (11), establish aerator (13) in the oxidation trough (11), this aerator (13) is communicated with oxidation fan (14), oxidation trough (11), absorbent recirculation pump (12), absorbing spraying layer (5) is connected in series by pipeline, oxidation trough (11), delivery pump (15), crystallization tank (2) is connected in series by pipeline, ammonia storage tank (16), ammonia transfer pump (17), absorbing spraying layer (5) is connected in series by pipeline, and ammonia transfer pump (17) outlet is connected with blender (19) import by pipeline, crystallization tank (2), slurries drawing pump (18), blender (19), inspissator (20), dewaterer (21), drier (22) is connected in series by pipeline, the flow liquid outlet of inspissator (20) top is connected by pipeline with oxidation trough (11), and the outlet of dewaterer (21) filter liquor is connected by pipeline with oxidation trough (11), heat exchanger (23) is set, blower fan (24) on the gas approach of absorption tower, heat exchanger (23) is connected in series by pipeline with drier (22).
2. a kind of high-efficiency ammonia flue gas desulfurization technique according to claim 1 and device is characterized in that: spiral-flow type absorbs distribution grid (4) to be made up of dividing plate, a plurality of rising tube and eddy flow plate, the rounded even distribution of tube of rising, and the dividing plate percent opening is 40～80%.
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| CN102029105A (en) * | 2011-01-06 | 2011-04-27 | 上海克硫环保科技股份有限公司 | Double-tower ammonia method desulfuration device and process |
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