CN102806006A - Flue gas desulfurization purifying system - Google Patents
Flue gas desulfurization purifying system Download PDFInfo
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- CN102806006A CN102806006A CN2012103158499A CN201210315849A CN102806006A CN 102806006 A CN102806006 A CN 102806006A CN 2012103158499 A CN2012103158499 A CN 2012103158499A CN 201210315849 A CN201210315849 A CN 201210315849A CN 102806006 A CN102806006 A CN 102806006A
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- flue gas
- desulfurizing agent
- fluidizer
- gas desulfurization
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000003546 flue gas Substances 0.000 title claims abstract description 70
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 44
- 230000023556 desulfurization Effects 0.000 title claims abstract description 40
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 102
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 76
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 37
- 239000000292 calcium oxide Substances 0.000 claims abstract description 36
- 239000000779 smoke Substances 0.000 claims abstract description 12
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 238000005243 fluidization Methods 0.000 claims description 49
- 239000002956 ash Substances 0.000 claims description 29
- 238000000746 purification Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 11
- 230000029087 digestion Effects 0.000 claims description 10
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
- 239000010882 bottom ash Substances 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 22
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 22
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 238000007600 charging Methods 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
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- 238000004611 spectroscopical analysis Methods 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a flue gas desulfurization purifying system, which comprises a desulfurizer, a dust remover and a chimney communicated in sequence outside the smoke outlet of an industrial furnace through a pipeline, wherein a desulfurizing agent is used for reacting in the desulfurizer; flue gas exhausted out of the industrial furnace is subjected to desulfurizing and dust removing treatment by using the desulfurizer and the dust remover; the desulfurizing agent is conveyed to the desulfurizer through a conveying device; the conveying device is provided with a stock bin and a fluidizer positioned at the inner bottom of the stock bin; the center of the fluidizer is provided with a vertical Venturi conveyer; the sucking hole of the Venturi conveyer is positioned on the upper part of the fluidizer; the upper part of the Venturi conveyer is provided with a central pipe which is used for conveying upwards; and the lower end of the Venturi conveyer is communicated with a water vapor conveying pipeline. The conveying device in the flue gas desulfurization purifying system can be used for conveying quicklime serving as a desulfurizing agent, and the quicklime can be digested into lime hydrate by using water vapor during conveying, so that the digestibility of lime in an entire process can be increased greatly, and the desulfurization efficiency is increased greatly.
Description
Technical field
The present invention relates to gas cleaning, particularly a kind of simple in structure and flue gas desulfurization purification system that desulfuration efficiency is higher.
Background technology
Shown in Figure 1 is a kind of semi-dry process flue gas desulphurization process for purifying of prior art flow process; It has used absorption recirculating fluidized bed (GSA) technology that suspends, and mainly comprises desulfurizing tower 102, deduster 103, middle grey storehouse 111, circulation ash bin 105, lime bank 109, lime service bin 108, pressurized gas system 110 and water system 112.Desulfurizing tower 102 is through connecting the pipeline before flue 1131 is switched to chimney 101; Vertical desulfurizing tower 102 middle parts of installing have desulfurizing agent inlet 1021 and circulating ash inlet 1022; The middle part hypomere is a venturi section 1023, and venturi section 1023 lower ends are connected to flue 1131 through a control of dust bend pipe 1024.As shown in Figure 2, venturi section 1023 comprises: the flaring pipeline section 10233 that is formed on the convergent pipeline section 10231 of control of dust bend pipe 1024 upper ends, middle tubule section 10232 and top.Flue gas is quickened by convergent pipeline section 10231; Through 10233 dischargings of tubule section 10232 arrival expander sections, formed gas-solid mixed zone 10230 in the position of expander section 10233 contiguous tubule sections 10232, again from material and flue gas 10230 actings in conjunction of desulfurizing agent inlet 1021 and 1022 entering of circulating ash inlet in the gas-solid mixed zone; Produce fierce turbulence and mix; Fully contact in the process that rises, constantly forms floccule and returns downwards; And floccule constantly disintegrates in fierce turbulence again by gas lift, forms the peculiar interior circulating granular stream of similar cycle fluidized-bed combustion boiler.
Desulfurizing agent and circulating ash are mixed in gas-solid mixed zone 10230 with flue gas after rear pass 1132 gets into deduster 103; The solid particle that captures through deduster 103; Be delivered to the grey storehouse 111, centre under the deduster 103 by conveying worm; Flue gas clean after dedusting gets into air-introduced machine 104 through smokejack 1133, sends into chimney 101 then and discharges.
The solid particle in grey storehouse 111 in the middle of delivering to; Major part is delivered to circulation ash bin 105 as circulating ash; Send in the desulfurizing tower 102 through circulating ash inlet 1022 through rotatory feeder valve, auger conveyor then, another part is transported to desulphurization ash bank 106 through air-transport system, regularly sends outside.
Desulfurizing tower 102 needed desulfurizing agent quick limes are transported to lime service bin 108 by lime bank 109 through air-transport system, send in the desulfurizing tower 102 through desulfurizing agent inlet 1021 through conveying worm again.
During the said equipment work; Flue gas is introduced desulfurizing tower 102 by flue 1131 before the chimney 101 of 1#, 2# sintering machine outlet 100, in desulfurizing tower 102, flue gas mixes with the quick lime, water, the circulating ash that add desulfurizing tower 102 mutually; Form violent turbulence state, the SO under this condition in the flue gas
2Can react the stable CaSO of generation rapidly with quick lime
42H
2O, the SO in the flue gas
2Be removed, flue gas after the desulfurization gets into sack cleaner 103 and removes the flue dust in the flue gas, and clean flue gas is sent into chimney 101 by air-introduced machine 104 and discharged after dedusting.The mechanism of the flue gas humidification activation desulphurization reaction that desulfurizing tower 102 is utilized mainly is: form water membrane, desulfurizing agent and SO on the sorbent particle surface
2Gas is all to wherein dissolving, thereby makes desulphurization reaction change into the ionic reaction in the moisture film by original gas-solid reaction, and major part is in time participated in the CaO of reaction and the SO in the flue gas in the flue gas in burner hearth
2Reaction generates CaSO
3And CaSO
4According to the operation principle of recirculating fluidized bed, make desulfurizing agent in desulfurizing tower 102 repeatedly the circulation, and with flue gas in SO
2Fully haptoreaction realizes desulfurization.
Present flue gas desulfurization purification system, this desulfurizing agent of quick lime will digest in desulfurizing tower for calcium hydroxide, make in the reaction effective adsorption area of desulfurizing agent little, and reactivity is lower, and it is lower to cause this flue gas adsorptive purifier to handle the operating efficiency of waste gas; And material uses venturi type or silo pump type to carry, and complex structure, energy consumption height cause production cost to improve (operating cost that comprises purchase cost and water, electricity etc.), take than large tracts of land, are unfavorable for installation and maintenance.
Summary of the invention
Be to solve the technical problem that prior art exists, the object of the invention be provide a kind of simple in structure, floor space is little, effective filtration area is big, the flue gas desulfurization purification system of high efficiency and low preparation cost.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of flue gas desulfurization purification system; Comprise through pipeline and be communicated with devulcanizer, deduster and chimney outside the industrial furnace outlet flue successively; Desulfurizing agent is delivered to said devulcanizer, and the flue gas that said devulcanizer and deduster come out to industrial furnace carries out desulfurization and dedusting to be handled, wherein; Said desulfurizing agent is delivered to said devulcanizer through transport; The fluidizer that said transport has feed bin and is positioned at the feed bin inner bottom part, and establish a vertical venturi conveyer at said fluidizer center, said venturi conveyer material sucking port is positioned at said fluidizer top; The central tube of said venturi conveyer top for upwards carrying, said venturi conveyer lower end is communicated with the moisture vapor transport pipeline.
The present invention is with respect to the beneficial effect of prior art, and flue gas desulfurization purification system of the present invention has the transport of being made up of the venturi conveyer of feed bin, the fluidizer that is positioned at said feed bin inner bottom part and the setting at said fluidizer center; The activation of tool feed bin promotes transport, utilizes to carry out strength with the venturi conveyer again behind the fluidizer activation desulfurizing agent and carry, and functions such as the feed bin of prior art, circulation feed bin, pay-off, digester that transport is integrated are in one; Having simplified the technology of desulphurization system forms; Cancelled carry in electric rotary dispenser commonly used, reduced feed bin and simplified conveying equipment, and through the desulfurizing agents such as calcium oxide of overactivation; Inner minute aperture increases; Specific area increases, and can improve the suction-operated to other polluters, makes system's desulfuration efficiency improve.
Said venturi conveyer lower end is communicated with the moisture vapor transport pipeline; Like this; Said fluidizer makes the desulfurizing agent fluidization that gets in the said feed bin; Fluidised desulfurizing agent gets into said venturi conveyer from the material sucking port of said venturi conveyer, is upwards delivered into the central tube of said venturi conveyer by the steam of said venturi conveyer ejection, and desulfurizing agent is by steam activation in this process.Desulfurizing agent after the activation gets into the devulcanizer middle part, immediately with the flue gas that gets into from said devulcanizer bottom SO
2Reaction, thus the sulphur in the flue gas is removed.The flue gas desulfurization purification system of prior art; Non-activated desulfurizing agent gets into the desulfurizing tower middle part, and flue gas gets in the said desulfurizing tower from said desulfurizing tower bottom, and water sprays in the said desulfurizing tower from the inlet between said desulfurizing tower middle part and bottom; Like this; Desulfurizing agent in said desulfurizing tower by the flue gas fluidization, and by the water activation, and then with flue gas in SO
2Reaction, thus remove the sulphur in the flue gas.Flue gas desulfurization purification system of the present invention is compared with the flue gas desulfurization purification system of prior art; Because the fluidization of desulfurizing agent and activation are to carry out at the independent transport of being made up of the venturi conveyer of feed bin, the fluidizer that is positioned at said feed bin inner bottom part and the setting at said fluidizer center; The fluidization of desulfurizing agent is effective, and activation rate is high; Owing in flue gas desulfurization device, can fully contact with the fluidization desulfurizing agent of overactivity rate, desulfurized effect improves greatly.
According to above-mentioned design, said industrial furnace outlet flue place is provided with and absorbs the air to water heat exchanger that heat produces steam, and said steam passes to said venturi conveyer lower end through said moisture vapor transport pipeline.Effectively utilize waste heat, reduce energy resource consumption.
According to above-mentioned design, said desulfurizing agent is a quick lime, in said transport and said devulcanizer, is calcium hydroxide by said steam effect digestion.
According to above-mentioned design, said feed bin is the round can shaped container, and the top is provided with quick lime feeding mouth and circulating ash feeding mouth, and the bottom has the tapered portion of being convenient to blanking, and a circular bottom is closed in the bottom of said tapered portion removably.
According to above-mentioned design; Said fluidizer comprises the fluidisation air compartment and several fluidisation nozzles that is fixed at said bottom inboard; Said fluidisation nozzle is installed on said fluidisation air compartment top; These fluidisation nozzles are communicated with external fluidized air pipe line through said fluidisation air compartment, the center line of said fluidizer and the central lines of said feed bin.The one, can prevent in feed bin inner bottom part buildup, the 2nd, can make bulk materials receive sufficient impact, can quick lime be carried out abundant activation and be beneficial to follow-up digestion process.
According to above-mentioned design, said venturi conveyer comprises: steam jet, reducing pipe, bottom pipeline and said central tube; Said central tube lower end is connected with reducing pipe; Has spacing between steam jet and the reducing pipe to form material sucking port; Steam jet is through bottom pipeline connection said moisture vapor transport pipeline, the center line of said venturi conveyer and the central lines of said fluidizer.
According to above-mentioned design, said fluidisation nozzle is the shower nozzle that circle wall is offered several fumaroles.With this air-flow that makes the ejection of all fluidisation nozzles in feed bin inner bottom part level to the formation level to crosscurrent, upwards do not blow material, can prevent bulk materials directly is blown in the venturi conveyer and causes fault.
According to above-mentioned design, said central tube inwall has high-density polyethylene ene coatings or sintered ceramic material layer.Prevent that with this calcium hydroxide and steam from luming on the tube wall of central tube, thereby ensure the normal operation of course of conveying
According to above-mentioned design; Said devulcanizer is the fluidization desulfurizing tower; The center has the desulfurizing agent inlet that is communicated with said central tube, and the bottom has the smoke inlet that is communicated with said industrial furnace outlet flue, and the top has the outlet of the flue gas after desulfurization that is communicated with the inlet of said deduster.
According to above-mentioned design, said deduster bottom ash hole downside is provided with grey storage vault, and said grey storage vault is communicated to the circulating ash feeding mouth of said transport through return pipeline.Thereby make its better and quick lime mixture slaking, can reach acting in conjunction to improve the technique effect of bulk devulcanization efficient.
Description of drawings
Fig. 1 is a prior art flue gas desulfurization process for purifying schematic flow sheet.
Fig. 2 is the sketch map of desulfurizing tower substructure among Fig. 1.
Fig. 3 is invention flue gas desulfurization purification system process flow diagram.
Fig. 4 is the structural representation of air to water heat exchanger among the present invention.
Fig. 5 is the structural representation of gas-liquid separator among the present invention.
Fig. 6 is the side-looking structural representation of transport among the present invention.
Fig. 7 is the structural representation of looking up of transport among the present invention.
Fig. 8 is fluidisation structure of nozzle sketch map among the present invention.
Fig. 9 is the diffraction spectroscopy figure before the steam activation of the present invention.
Figure 10 is the diffraction spectroscopy figure after the steam activation of the present invention.
Wherein, description of reference numerals is following: 1 industrial furnace, 2 air to water heat exchangers, 21 heating sections, 22 heat pipes, 23 external connection pipes, 24 air outlet valves, 25 water receptacles, 26 water pipes, 27 outer water tube, 20 vapor lines, 3 transports, 30 first smoke pipes, 31 feed bins, 311 shells, 312 tapered portion, 313 bottoms, 314 quick lime feeding mouths, 315 circulating ash feeding mouths, 32 fluidizers, 321 fluidisation nozzles, 3211 fumaroles, 322 fluidisation air compartments, 323 fluidized wind pipelines, 324 switch valves, 33 venturi conveyers, 331 steam jet, 332 material sucking ports, 333 reducing pipes, 334 bottom pipelines, 335 central tubes, 34 supports, 4 gas-liquid separators, 41 main bodys, 411 separation chambers, 412 are locellus, 413 air inlets, 42 riseies, 43 anti-liquid covers, 44 slits, 45 blast pipes, 46 outer circulating tubes, 47 return-air mouths, 48 deflection plates, 40 desulfurizing agent pipes, 5 fluidized wind systems, 51 airducts, 52 fluidisation blower fans, 50 return pipelines, 6 devulcanizers, 60 mixed pipe lines, 61 desulfurizing agents inlet, 62 smoke inlets, 7 dedusters, 70 smoke evacuation pipelines, 8 grey storage vaults, 9 air-introduced machines, 10 chimneys, the outlet of 100 sintering machines, 101 chimneys, 102 desulfurizing towers, 1021 desulfurizing agents inlet, 1022 circulating ash inlet, 1023 venturi sections, 10231 draw sections, 10232 tubule sections, 10233 Zhejiang expander sections, 10230 gas-solid mixed zones, 1024 control of dust bend pipes, 103 dedusters, 104 air-introduced machines, 105 circulation ash bins, 106 desulphurization ash banks, 108 lime service bins, 109 lime banks, 110 pressurized gas system, 111 Zhong Jian grey storehouses, 112 water systems, 1121 water pumps, 1122 tanks, 1123 water pipes, 1124 water injectors, 1131 flues, 1132 rear pass, 1133 smokejacks again.
The specific embodiment
The exemplary embodiments that embodies characteristic of the present invention and advantage will be described in detail in following explanation.Be understood that the present invention can have various variations on various embodiment, its neither departing from the scope of the present invention, and explanation wherein and to be shown in be the usefulness of being used as explanation in essence, but not in order to restriction the present invention.
As shown in Figure 3, the present invention provides a kind of flue gas desulfurization purification system, comprising: the activation of air to water heat exchanger 2, desulfurizing agent promotes the chimney 10 of transport 3, fluidized wind system 5, devulcanizer 6, deduster 7, grey storage vault 8 and least significant end.Industrial furnace 1 gas outlet is communicated with devulcanizer 6 through first smoke pipe 30; Devulcanizer 6 is communicated with deduster 7 through mixed pipe line 60; Grey storage vault 8 under deduster 7 ash holes promotes transport 3 through the activation that return pipeline 50 is connected to desulfurizing agent, and deduster 7 gas outlets are communicated to chimney 10 through smoke evacuation pipeline 70.Transport 3 is carried devulcanizer 6 desulfurizer therefors through desulfurizing agent pipe 40; Air to water heat exchanger 2 can absorb heat in the flue gas and produce steam at industrial furnace 1 outlet flue place; Here the activation that the steam that produces can be again be delivered to desulfurizing agent through vapor line 20 promotes transport 3, and the activation of desulfurizing agent lifting transport 3 just can utilize the steam that the produced transmitting power as desulfurizing agent like this.
Air to water heat exchanger 2 of the present invention can be selected the existing various steam generators that utilize waste heat for use; As shown in Figure 4; In the present embodiment, air to water heat exchanger 2 is supplied water by outer water tube 27, and inner equipment such as heat pipe 22, external connection pipe 23, water pipe 26 and heating section 21 by the number cover are formed.Heat pipe respectively is provided with upper header 222 and lower collecting box 221 in two ends about in the of 22, and intermediate sleeve is in heating section 21, and upper header 222 is communicated to air outlet valve 24 through external connection pipe 23, and lower collecting box 221 is communicated to water receptacle 25 through water pipe 26.Its heating section 21 places in the flue gas hot fluid air channel; The horizontal heating section 21 of plunderring of hot flue gas; Water in heating heat pipe 22 middle parts and the lower collecting box 221, water become steam and get into upper header 222, finally get into the air inlet 413 of gas-liquid separator 4 through external connection pipe 23 and air outlet valve 24.
As shown in Figure 5; In the present embodiment, the round can shaped main body 41 of gas-liquid separator 4 is divided into separation chamber 411 and locellus 412 again by dividing plate 49, and air inlet 413 is located at separation chamber's 411 top tangential directions; By the riser 42 connection separation chambers 411 at middle part and locellus 412 again; The anti-liquid cover 43 of anti-liquid phase wriggling is housed around riser 42 bottoms, and locellus 412 tops are provided with the smaller blast pipe of diameter 45 again, leave slit 44 between riser 42 and the blast pipe 45; Locellus 412 bottoms are communicated with an end of outer circulating tube 46 again, and the other end of outer circulating tube 46 extend into 411 nearly bottoms, separation chamber and is communicated with the return-air mouth 47 of a deflection plate 48.Deflection plate 48 centers, round can shaped main body 41 axle center and riser 42 axle center and blast pipe 45 axle center all are located on the same line.In the running, the steam that air to water heat exchanger 2 produces tangential under pressure gets into separation chamber 411, and the liquid phase in the steam is thrown toward round can shaped main body 41 inwalls with the drop form under centrifugal action; Get rid of to the drop of inwall more and more; Slowly accumulate liquid film, liquid film is more and more thicker, finally under the gravity effect; Liquid film flow to round can shaped main body 41 bottoms along inwall, accomplishes a gas-liquid separation.Following rotational gas flow is still remaining to have Partial Liquid Phase, runs into stopping of deflection plate 48 in the underspin process, becomes interior eddy flow by the outward turning circulation; Get into riser 42; The flow velocity of swirling eddy further improves in the riser 42, and is obvious to liquid phase separation effect wherein, separates the liquid phase continued upwards; A part gets into locellus 412 through the slit 44 between riser 42 and the blast pipe 45 again; Get into separation chamber 411 through outer circulating tube 46 once more from return-air mouth 47 then and accomplish separation for the second time, a part gets into vapor line 20 through blast pipe 45 drainage gas-liquid separators 4.Flow to the then recyclable utilization again of water of round can shaped main body 41 bottoms.Devulcanizer 6 can be selected existing reverse-flow type recirculating fluidized bed (RCFB) or fluidization desulfurizing tower desulphurization reaction equipment such as [belonging to the absorption recirculating fluidized bed (GSA) that suspends]; (with reference to Fig. 2) as shown in Figure 3; Devulcanizer 6 is preferably present effect fluidization desulfurizing tower preferably in the specific embodiment of the invention; It is communicated with the desulfurizing agent inlet 61 of the activation lifting transport 3 of desulfurizing agent through desulfurizing agent pipe 40; Devulcanizer 6 bottoms are for being communicated with the smoke inlet 62 of industrial furnaces 1 outlet flue through first smoke pipe 30, devulcanizer 6 tops then be with the desulfurizing agent hybrid reaction after the outlet 63 of flue gas, outlet 63 connection mixed pipe lines 60.With respect to the desulfurizing tower in the background technology 102, devulcanizer 6 differences of the present invention are, because the present invention utilizes moisture vapor transport meeting predigestion desulfurizing agent; The moisture film on calcium hydroxide particle surface forms tentatively in moisture vapor transport and predigestion; So devulcanizer 6 need not digest water and can normally turn round yet, certainly; In order to improve the digestibility of lime again, also can establish the discharge apparatus (no longer signal among the figure) of compensation atomized water in the devulcanizer 6.Devulcanizer 6 chargings place of the present invention simultaneously need not be established the spiral feeding structure again and carried out charging; Activation lifting transport 3 steam flows through the control desulfurizing agent can be controlled the desulfurizing agent input; And devulcanizer 6 of the present invention is no longer established the circulating ash charging aperture, and circulating ash will get into devulcanizer 6 after will promoting transport 3 activation digestion through the activation of desulfurizing agent again.
Deduster 7 can be electrostatic precipitator or sack cleaner; Describe with sack cleaner in the present embodiment; As shown in Figure 3; Deduster 7 is provided with the outlet of flue gas after import and the dedusting of mixed flue gas, and import links to each other with devulcanizer 6 exhanst gas outlets 63 through mixed pipe line 60, and outlet then is communicated to chimney 10 through the pipeline 70 of discharging fume.Deduster 7 is separated dust from flue gas, deduster 7 bottom ash hole downsides are provided with grey storage vault 8, and the flying dust of separating is delivered to the grey storage vault 8 under the deduster 7 by conveying worm.Because some available calcified material in the flying dust in order to improve the utilization rate of calcium, can return a part of circulating ash with deduster 7 collected flying dusts and in the activation lifting transport 3 of desulfurizing agent, utilize again.The present invention's ash storage vault 8 has the return pipeline 50 that the activation that is communicated to desulfurizing agent promotes transport 3; This point is different from prior art; Circulating ash behind the desulphurization reaction can promote transport 3 to the activation of desulfurizing agent through return pipeline 50 and carry out the once desulfurization operation again; Can be with circulating ash again through the primary water vapor, thus make its better with the quick lime mixture slaking, can reach the technique effect of acting in conjunction with raising bulk devulcanization efficient.
Because it is big that the molal volume of product becomes, reaction is exothermic reaction again, and the molal volume of the calcium hydroxide of generation is greater than the molal volume of calcium oxide; Cause particle volume to expand, make breakage of particles to generate some smaller particles; Make grain diameter reduce, specific area increases.Above factor causes the particle swelling fracture, and particle diameter diminishes.The product that particle diameter is little has bigger specific area, helps desulfurization.
In flue gas desulfurization course, under the effect of steam, activated the activity of desulfurizing agent neutral and alkali material, improved the growing amount of Ca (OH) 2, make under identical Ca/S, improved the reaction rate and the reactivity of sulfur dioxide and desulfurizing agent; Improve the specific area of desulfurizing agent simultaneously, thereby under identical Ca/S mol ratio condition, improved desulfuration efficiency.
The powder that digestion is come out is active high, and particle diameter is little, and quantity-produced efficient is high.The product that particle diameter is little has bigger specific area, and its reactivity is greater than the big product of particle diameter, helps desulfurization.
Shown in Fig. 6 to 8; The present invention provides a kind of activation of desulfurizing agent to promote transport 3 in addition; It carries effect better; And the predigestion rate of this desulfurizing agent of lime is higher in carrying, and the activation of desulfurizing agent promotes fluidizer 32 and the venturi conveyer 33 that transport 3 has feed bin 31, is positioned at feed bin 31 inner bottom parts.Like Fig. 6, shown in Figure 7; The feed bin 31 that the activation of desulfurizing agent promotes transport 3 is preferably the round can shaped container; The top is provided with quick lime feeding mouth 314 and circulating ash feeding mouth 315; The bottom of the shell 311 of feed bin 31 is formed with the tapered portion 312 of being convenient to blanking, and by several supports 34 feed bin 31 is supported in ground, circular bottom 313 removable bottoms that are closed in tapered portion 312.Transport has the transport of being made up of the venturi conveyer of feed bin, the fluidizer that is positioned at said feed bin inner bottom part and the setting at said fluidizer center; The activation of tool feed bin promotes transport, utilizes to carry out strength with the venturi conveyer again behind the fluidizer activation desulfurizing agent and carry, and functions such as the feed bin of prior art, circulation feed bin, pay-off, digester that transport is integrated are in one; Having simplified the technology of desulphurization system forms; Cancelled carry in electric rotary dispenser commonly used, reduced feed bin and simplified conveying equipment, and through the desulfurizing agents such as calcium oxide of overactivation; Inner minute aperture increases; Specific area increases, and can improve the suction-operated to other polluters, makes system's desulfuration efficiency improve.
Fluidizer 32 can be selected traditional fluidizing equipments such as fluid bed for use, as long as can the desulfurizing agent powder of feed bin 31 bottoms be realized fluidisation.Like Fig. 6, shown in Figure 7, fluidizer 32 is positioned at feed bin 31 bottoms, the central lines of the center line of fluidizer 32 and feed bin 31.Fluidizer 32 is made up of several fluidisation nozzles 321, fluidisation air compartment 322 and fluidized wind pipeline 323; Fluidisation air compartment 322 is formed at bottom 313 inboards; Fluidisation nozzle 321 is installed on this fluidisation air compartment 322 tops, and these fluidisation nozzles 321 are communicated with external fluidized air pipe line 323 through fluidisation air compartment 322.As shown in Figure 8; Fluidisation nozzle 321 is preferable all to be the shower nozzle that circle wall is offered several fumaroles 3211; With this air-flow that makes 321 ejections of all fluidisation nozzles in feed bin 31 inner bottom part levels to the formation level to crosscurrent; The one, can prevent in feed bin 31 inner bottom part buildups, the 2nd, can make bulk materials receive sufficient impact, can quick lime be carried out abundant activation and be beneficial to follow-up digestion process; The 3rd, upwards do not blow material, can prevent bulk materials directly is blown in the venturi conveyer 33 and causes fault.
As shown in Figure 3, fluidized wind system 5 is the supply system of the fluidisation of transport 3 with gases at high pressure, comprises tracheae 51 and fluidisation blower fan 52, and tracheae 51 is communicated with fluidized wind pipeline 323.Fluidisation blower fan 52 can be the roots blower of high reliability, and it is fluidized wind that fluidisation blower fan 52 will suck supercharging air, can certainly be fluidized wind with suction steam or other effect gas boosting.
Venturi conveyer 33 can be selected traditional venturi structure for conveying for use, as long as can the fluidized state desulfurizing agent powder of feed bin 31 bottoms outwards be carried through upper pipeline.Like Fig. 6, shown in Figure 7, the central lines of the center line of venturi conveyer 33 and fluidizer 32.Venturi conveyer 33 comprises: steam jet 331, reducing pipe 333, bottom pipeline 334 and central tube 335.Central tube 335 lower ends are connected with reducing pipe 333, have spacing between steam jet 331 and the reducing pipe 333 to form material sucking port 332, and steam jet 331 is communicated with vapor line 20 through bottom pipeline 334.Central tube 335 upper ends are communicated to desulfurizing agent inlet 61 through vulcanizing agent pipe 40, to carry out the conveying of desulfurizing agent.Like this; Steam jet 331 has constituted the venturi injection structure for conveying that the activation that is positioned at desulfurizing agent promotes transport 3 bottoms jointly with reducing pipe 333; Steam is from steam jet 331 ejection at a high speed; Material sucking port 332 places at reducing pipe 333 form negative pressuren zone, the quick lime after 32 activation of suction fluidizer.
The operating process of the activation lifting transport 3 of desulfurizing agent of the present invention is following: with reference to Fig. 6; Add lime and circulating ash from feed bin 31 top quick lime feeding mouths 314 and circulating ash feeding mouth 315 earlier; Meanwhile; Fluidized wind system 5 feeds hp fluid air through fluidized wind pipeline 323 to fluidisation air compartment 322 and fluidisation nozzle 321, and the air-flow of fluidisation nozzle 321 ejections blows afloat the quicklime particles activation of feed bin 31 bottoms; Then; Feed steam to bottom pipeline 334; Steam jet 331 sprays the high speed water steam in reducing pipe 333, form negative pressuren zone in reducing pipe 333 porch, and the quick lime after fluidizer 32 activation gets into reducing pipe 333 inlets; In reducing pipe 333, mix, upwards carry through central tube 335 with the high speed water steam.What use here is the low-pressure water steam, and temperature is generally at 85 ~ 95 degree in the central tube 335, and these conditions all can be quickened the wherein digestion rate of quick lime, and CaO is converted into Ca (OH) in the quick lime in central tube 335 thereby make
2Because the Ca (OH) that digestion generates in central tube 335
2Low weight, density is 0.55g/cm
3, and the density of CaO is 1g/cm
3So the CaO upward velocity is little, the vertical length of central tube 335 can prolong the reaction time of CaO and steam, digests the top of the central tube 335 of calcium hydroxide arrival completely and be transported to devulcanizer 6 through principle of overflow to use.
With reference to Fig. 3, when flue gas desulfurization purification system of the present invention was worked, sulfur-containing smoke gas was introduced devulcanizers 6 from industrial furnace 1 gas outlet through first smoke pipe 30; Demineralized water is delivered to through outer water tube 27 through pressurization back and is produced steam after receiving flue gas heating in the air to water heat exchanger 2; After isolating water wherein through gas-liquid separator 4, get into activation through vapor line 20 and promote the conveying source of the gas of transports 3 bottoms as venturi conveyer 33; The quick lime that adds the activation lifting transport 3 of desulfurizing agent is blown down by the fluidized wind of the fluidizer 32 of bottom and forms local fluidization, under the delivering vapor air-flow of venturi conveyer 33 drives, delivers to devulcanizer 6; In devulcanizer 6, flue gas mixes with the lime, water vapour, the circulating ash that add devulcanizer 6 mutually, forms violent turbulence state, the SO under this condition in the flue gas
2Can react the stable CaSO of generation rapidly with lime
42H
2O, the SO in the flue gas
2Be removed; Flue gas after the desulfurization gets into sack cleaner 7 and removes the flue dust in the flue gas; Clean flue gas is sent into chimney 10 by air-introduced machine 9 and is discharged after dedusting.Flue dust under sack cleaner 7 removes, a part turn back to activation lifting transport 3 and digest circulation again, and another part is put into grey storage vault 8, regularly sends outside.
In addition; Central tube 335 inwalls of the present invention are preferable to have VHD polyethylene coating or sintered ceramic material wearing layer; Make its inwall very smooth and can be high temperature resistant, prevent that with this calcium hydroxide and steam from luming on the tube wall of central tube 335, thus the normal operation of guarantee course of conveying.In order to prevent that gluing wall, obstruction and moisture content crosses high phenomenon, the ratio of lime and water (steam) is controlled between 0.8～2, and needed all the other water of catapepsis spray at the fluid-bed sweetening tower bottom.
In addition, owing in the lime material slag is arranged all, so, need regularly empty feed bin 31 and open bottom 313 and carry out scarfing cinder, to enhance productivity.In the present embodiment, fluidisation air compartment 322, fluidisation nozzle 321, steam jet 331 and bottom pipeline 334 all are fixedly installed in bottom 313, and bottom 313 can be connected with tapered portion 312 through removable connected modes such as flange connections.When needs maintenance or deslagging, pull down bottom 313 from tapered portion 312 and get final product.
And as shown in Figure 6, the fluidized wind pipeline 323 that the activation of desulfurizing agent promotes transport 3 also can be communicated with through a switch valve 324 with bottom pipeline 334; Like this; Whenever necessary, can be used for steam jet 331 by the fluidized wind that pressure is bigger, central tube 335 carried out the cleaning of tube wall and dredge stifled.Can certainly feed HCS through vapor line 20 to fluidized wind pipeline 323 in addition, carry out fluidisation, to obtain better activation and digestion effect with HCS.
In service, the activation of desulfurizing agent of the present invention promotes the conveying capacity of transport 3 desulfurizing agents and can control through the emitted dose of control steam jet 331, certainly, also needs fluidizer 32 to cooperate.In addition; The needed quick lime of desulphurization system also can be transported to a lime service bin through induction system by the lime bank; Quantitatively be transported in real time in the transport 3 through conveying worm more afterwards and use, can macroscopic view go up the better consumption of this desulfurizing agent of control lime like this.Find through test; The activation of this kind desulfurizing agent promotes transport 3 and in conveying, can 40% to 60% of CaO total amount in the lime be digested; Because of various places lime quality is different, so digestibility has difference, in a word; Can promote the predigestion rate of quick lime greatly, thereby effectively improve the reaction efficiency of desulphurization system.
Though described the present invention with reference to exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.Because the present invention's practical implementation and do not break away from the spirit or the essence of invention in a variety of forms; So be to be understood that; The foregoing description is not limited to any aforesaid details; And should in enclose spirit that claim limited and scope, explain widely, therefore fall into whole variations and remodeling in claim or its equivalent scope and all should be the claim of enclosing and contain.
Claims (10)
1. flue gas desulfurization purification system; Comprise through pipeline being communicated with devulcanizer, deduster and chimney outside the industrial furnace outlet flue successively, desulfurizing agent is delivered to said devulcanizer, and the flue gas that said devulcanizer and deduster come out to industrial furnace carries out desulfurization and dedusting to be handled; It is characterized in that
Said desulfurizing agent is delivered to said devulcanizer through transport; The fluidizer that said transport has feed bin and is positioned at the feed bin inner bottom part; And establish a vertical venturi conveyer at said fluidizer center; Said venturi conveyer material sucking port is positioned at said fluidizer top, the central tube of said venturi conveyer top for upwards carrying, and said venturi conveyer lower end is communicated with the moisture vapor transport pipeline.
2. flue gas desulfurization purification system as claimed in claim 1; It is characterized in that; Said industrial furnace outlet flue place is provided with and absorbs the air to water heat exchanger that heat produces steam, and said steam passes to said venturi conveyer lower end through said moisture vapor transport pipeline.
3. flue gas desulfurization purification system as claimed in claim 2 is characterized in that, said desulfurizing agent is a quick lime, in said transport and said devulcanizer, is calcium hydroxide by said steam digestion.
4. flue gas desulfurization purification system as claimed in claim 3; It is characterized in that said feed bin is the round can shaped container, the top is provided with quick lime feeding mouth and circulating ash feeding mouth; The bottom has the tapered portion of being convenient to blanking, and a circular bottom is closed in the bottom of said tapered portion removably.
5. flue gas desulfurization purification system as claimed in claim 4; It is characterized in that; Said fluidizer comprises the fluidisation air compartment and several fluidisation nozzles that is fixed at said bottom inboard; Said fluidisation nozzle is installed on said fluidisation air compartment top, and these fluidisation nozzles are communicated with external fluidized air pipe line through said fluidisation air compartment, the center line of said fluidizer and the central lines of said feed bin.
6. flue gas desulfurization purification system as claimed in claim 5 is characterized in that, said venturi conveyer comprises: steam jet, reducing pipe, bottom pipeline and said central tube; Said central tube lower end is connected with reducing pipe; Has spacing between steam jet and the reducing pipe to form material sucking port; Steam jet is through bottom pipeline connection said moisture vapor transport pipeline, the center line of said venturi conveyer and the central lines of said fluidizer.
7. flue gas desulfurization purification system as claimed in claim 5 is characterized in that, said fluidisation nozzle is the shower nozzle that circle wall is offered several fumaroles.
8. like each described flue gas desulfurization purification system of claim 1 to 7, it is characterized in that said central tube inwall has high-density polyethylene ene coatings or sintered ceramic material layer.
9. flue gas desulfurization purification system as claimed in claim 8; It is characterized in that; Said devulcanizer is the fluidization desulfurizing tower; The center has the desulfurizing agent inlet that is communicated with said central tube, and the bottom has the smoke inlet that is communicated with said industrial furnace outlet flue, and the top has the outlet of the flue gas after the desulfurization that is communicated with the inlet of said deduster.
10. like each described flue gas desulfurization purification system of claim 4 to 7, it is characterized in that said deduster bottom ash hole downside is provided with grey storage vault, said grey storage vault is communicated to the circulating ash feeding mouth of said transport through return pipeline.
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| CN201210315849.9A CN102806006B (en) | 2012-08-30 | 2012-08-30 | Flue gas desulfurization purifying system |
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| CN109045909A (en) * | 2018-08-31 | 2018-12-21 | 广州市环境保护工程设计院有限公司 | A environmental protection dust suppression device for furniture workshop |
| CN112604611A (en) * | 2020-11-26 | 2021-04-06 | 清华大学 | Device and method for carrying out chemical energy storage/discharge by using carbide slag |
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