CN100336755C - Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment - Google Patents
Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment Download PDFInfo
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- CN100336755C CN100336755C CNB2004101018579A CN200410101857A CN100336755C CN 100336755 C CN100336755 C CN 100336755C CN B2004101018579 A CNB2004101018579 A CN B2004101018579A CN 200410101857 A CN200410101857 A CN 200410101857A CN 100336755 C CN100336755 C CN 100336755C
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Abstract
The present invention relates to a method and equipment for preparing two-stage hydrated lime used in a flue gas desulphurization system, which belongs to the technical field of flue gas desulphurization. In the equipment of the present invention, the bottom of a first-stage lime reaction column is connected with a raw material bin through a Venturi sector; the raw material bin is provided with a quicklime inlet on the top, and the cone at the bottom of the raw material bin is provided with an air stream inlet; a water injector is arranged in the first-stage lime reaction column, and the upper outlet of the water injector is connected with the inlet of a second-stage lime-slaking column; an air nozzle is arranged in the second-stage lime-slaking column, and the lower outlet of the air nozzle is connected with the inlet of a lower discharge cyclone separator; discharging pipes are arranged on an oblique plane at the bottom of the lower discharge cyclone separator; a dual channel is arranged at the bottom of the oblique plane; one side of the dual channel is connected with an air oblique slot whose bottom is connected with the lower part of the first-stage lime reaction column, and a feeding pipe which is communicated with the bottom of the second-stage lime-slaking column; the other end of the dual channel is connected with a winch used for conveying the products. The method of the present invention has the advantages of simple procedure and convenient operation; the equipment of the present invention has the advantages of reasonable design and low equipment cost.
Description
Technical field
The invention belongs to the flue gas desulfurization technique field, especially for the method for preparing two-stage slaked lime in use and the device of flue gas desulphurization system.
Background technology
Sulfurous gas is one of principal pollutant that cause problem of environmental pollutions such as Greenhouse effect, acid rain.China's energy structure fire coal for a long time accounts for more than 70% always, and in foreseeable future, China is that the energy structure of main energy sources can not obtain radical change with the coal, and using in a large number of coal produces a large amount of pollutents such as sulfurous gas.At present, China's sulfurous gas annual emissions is first place, the world, position, has a strong impact on the Sustainable development of Chinese national economy.
The flue gas desulfurization of prior art can be divided into wet method and dry method (semidrying) two big classes.Wet process of FGD technology (WFGD), though the desulfuration efficiency height, complex process, resistance are bigger, one-time investment is big, working cost is high, floor space is big.And the desulfurization product of dry flue gas desulphurization is a dry powder, can well overcome some problem and shortage of wet desulphurization.Along with the research and development of Technology, the particularly development of circulating fluid bed flue-gas desulfurizing technology, the dry flue gas desulphurization technology has obtained application more and more widely.In dry method flue gas desulfur device, sweetening agent sprays into the absorption tower with dry powder, and water sprays into by water spouting nozzle, and sweetening agent is slaked lime powder normally.For the dry flue gas desulphurization technology, the size of sorbent particle particle diameter and surface-active height are the important factors that influences the height of the utilization ratio of sweetening agent in its desulphurization system and desulfurization degree.Yet present circulating fluid bed flue-gas desulfurizing technology mostly utilizes slaked lime powder that the non-fluidization mode produces as sweetening agent, is exactly the usual way of producing slaked lime at present as Chinese patent ZL01275451.X disclosed " a kind of quicklime slaking device ".These slaked lime powders not only price are higher, and particle diameter is bigger, and surfactivity is poor, and are very low in the utilization ratio of the sorbent particle of thionizer internal reaction, and desulfurization degree is not high simultaneously, increased the working cost of desulphurization system.
Summary of the invention
At above-mentioned problems of the prior art, it is stronger to the purpose of this invention is to provide a kind of adaptability of restricted condition that exists in actual applications, method for preparing two-stage slaked lime in use that is used for flue gas desulphurization system and device thereof that digestive efficiency is higher.The inventive method program is simple, easy to operate.Apparatus of the present invention are reasonable in design, equipment cost is low, use the running cost that the present invention can reduce flue gas desulphurization system greatly.
In order to realize above-mentioned goal of the invention, technical scheme of the present invention realizes as follows:
A kind of method for preparing two-stage slaked lime in use that is used for flue gas desulphurization system, it comprises uses one-level lime reaction tower, secondary lime slaking tube to reach air draft cyclonic separator down, and its algorithm is:
1), mixes back formation fluidized mixture with the unslaked lime material that the bottom of one-level lime reaction tower is imported with the bottom input of fluidized wind by one-level lime reaction tower.
2) the Venturi section of fluidized mixture process one-level lime reaction tower enters the awl column body segment diffusion of one-level lime reaction tower, with multi-level water spray system generation digestion reaction formation gas, liquid, solid three-phase mixed reactant set in the one-level lime reaction tower.
3) fall back to formation internal recycle in the one-level lime reaction tower behind the bump of particle that a part of terminal flow velocity is bigger in the mixed reactant and one-level lime reaction tower direct tube section top, remaining particle is along with gas enters secondary lime slaking tube.
4) quick digestion reaction takes place in the high-temperature water vapor that is sprayed in mixed reactant and the secondary lime slaking tube, and the hybrid reaction composition granule behind overactivation forms slaked lime along with gas enters down the air draft cyclonic separator.
5) slaked lime of quality major part is input to by the skewed slot that descends the air draft cyclonic separator and realizes recirculation in the one-level lime reaction tower, the slaked lime of quality smaller portions is transported to the slaked lime finished bin by control valve through auger and stores, and the weary gas in the following air draft cyclonic separator can directly be sent into the desulfurization reaction tower inlet.
In above-mentioned preparation method, the warm air of described fluidized wind for blasting with gas blower, warm air are the normal temperature air of heater via heating.
In above-mentioned preparation method, described multi-level water spray system is made up of two-layer, the bottom water spray system places in the awl column body segment of one-level lime reaction tower, the upper strata water spray system places in the direct tube section of one-level lime reaction tower, and each layer water spray system adopts two-fluid spray nozzle to be arranged in one-level lime reaction tower center.
In above-mentioned preparation method, the fluidizing velocity of fluidized wind is 1～10m/s in the described one-level lime reaction tower, and the fluidizing velocity of Venturi section quicklime particles is 14～18m/s.
Realize the above-mentioned device that is used for the method for preparing two-stage slaked lime in use of flue gas desulphurization system, it comprises that one-level lime reaction tower, secondary lime slaking tube reach air draft cyclonic separator down.Its constructional feature is, described one-level lime reaction tower is to be formed by connecting by direct tube section and awl column body segment, and the bottom of awl column body segment is provided with the Venturi section.Venturi Duan Yuyuan feed bin connects, and is equipped with the unslaked lime import on the former feed bin.The bottom of former feed bin is a cone, is equipped with the fluidized wind import on the cone.Be provided with the spaced apart water-jet of multilayer in the one-level lime reaction tower, the outlet of one-level lime reaction tower top links to each other with the inlet of described secondary lime slaking tube.Be provided with spray vapour nozzle in the secondary lime slaking tube, the lower part outlet of secondary lime slaking tube is connected with the inlet of following air draft cyclonic separator.The bottom surface of following air draft cyclonic separator is a tapered plane, is equipped with vapor pipe on the tapered plane.The bottom of tapered plane is equipped with the two channels that is opened and closed by two-way control valve control, the carrier pipe that a twin-channel side connects air flume and is communicated with the bottom of secondary lime slaking tube, the air flume bottom is connected with one-level lime reaction tower awl column body segment bottom, and twin-channel opposite side connects the auger of carrying finished product.
In above-mentioned device, be provided with two-layer spaced apart water-jet in the described one-level lime reaction tower, wherein the bottom water-jet places in the awl column body segment of one-level lime reaction tower, the upper strata water-jet places in the direct tube section of one-level lime reaction tower, and each water-jet adopts two-fluid spray nozzle to be arranged in one-level lime reaction tower center.
In above-mentioned device, the bottom of described cone is equipped with the ash port that is opened and closed by control valve control.
In above-mentioned device, described each control valve is a star valve.
Compare with currently used non-fluidization quicklime slaking device, the invention has the advantages that:
The first, unslaked lime reacts with atomizing droplet under fluidized, has avoided the equipment pipe fouling to stop up, and the branch two-stage is carried out digestion reaction and improved the quicklime slaking rate.
The second, to the physical adsorption of water vapor and the chemical reaction of water molecules, further improve the ability that it absorbs sulfurous gas by sweetening agent.
The 3rd, the finished product slaked lime is the dry powder attitude, and activity improves greatly, and particle size range is lower than the particle of 20um more than 85%, is convenient to store.
The 4th, apparatus of the present invention can be directly and desulphurization system connect, operation continuously improves the stability of desulphurization system operation simultaneously, reduces the running cost of flue gas desulphurization system.
The present invention will be further described below in conjunction with accompanying drawing and concrete embodiment.
Description of drawings
Accompanying drawing is the structure principle chart of apparatus of the present invention.
Embodiment
Referring to accompanying drawing, apparatus of the present invention comprise that one-level lime reaction tower 5-1, secondary lime slaking tube 5-2 reach air draft cyclonic separator 6 down.One-level lime reaction tower 5-1 is formed by connecting by direct tube section and awl column body segment, and the bottom of awl column body segment is provided with Venturi section 3, and Venturi section 3 is connected with former feed bin 12.Be equipped with unslaked lime import 1 on the former feed bin 12, the bottom of former feed bin 12 is a cone 14.Be equipped with fluidized wind import 2 on the cone 14, the bottom of cone 14 is equipped with the ash port 13 by the control valve 7 control switchings of star.Be provided with the water-jet 4 that two-layer employing two-fluid spray nozzle is arranged in one-level lime reaction tower 5-1 center at interval among the one-level lime reaction tower 5-1, wherein bottom water-jet 4 places in the awl column body segment of one-level lime reaction tower 5-1, and upper strata water-jet 4 places in the direct tube section of one-level lime reaction tower 5-1.The outlet of one-level lime reaction tower 5-1 top links to each other with the inlet of secondary lime slaking tube 5-2, is provided with spray vapour nozzle 17 among the secondary lime slaking tube 5-2, and the lower part outlet of secondary lime slaking tube 5-2 is connected with the inlet of following air draft cyclonic separator 6.The bottom surface of following air draft cyclonic separator 6 is a tapered plane 10, is equipped with vapor pipe 11 on the tapered plane 10.The bottom of tapered plane 10 is equipped with the two channels 15 that is opened and closed by 7 controls of two-way star control valve.The carrier pipe 16 that one side of two channels 15 connects air flume 8 and is communicated with the bottom of secondary lime slaking tube 5-2, air flume 8 bottoms are connected with one-level lime reaction tower 5-1 awl column body segment bottom, and the opposite side of two channels 15 connects the auger 9 of carrying finished product.
When apparatus of the present invention were used, its workflow was:
1) normal temperature air with the heater via heating blasts the formation fluidized wind with gas blower, fluidized wind mixes back formation fluidized mixture by the fluidizing velocity input of the fluidized wind import 2 on the cone 14 of one-level lime reaction tower 5-1 bottom with 1～10m/s with the unslaked lime material that the unslaked lime import 1 on the one-level lime reaction tower 5-1 lower feed storehouse 12 is imported.
2) the fluidized mixture enters the fluidizing velocity diffusion of the awl column body segment 3 of one-level lime reaction tower 5-1 with 14～18m/s through the Venturi section of one-level lime reaction tower 5-1, and the two-layer water spray system generation digestion reaction that adopts two-fluid spray nozzle to arrange with center in the one-level lime reaction tower 5-1 forms gas, liquid, solid three-phase mixed reactant.
3) fall back to formation internal recycle in the one-level lime reaction tower 5-1 behind the bump of particle that a part of terminal flow velocity is bigger in the mixed reactant and one-level lime reaction tower 5-1 direct tube section top, remaining particle is along with gas enters secondary lime slaking tube 5-2.
4) about mixed reactant enters secondary lime slaking tube 5-2 and stops 3 seconds kinds, quick digestion reaction takes place with the high-temperature water vapor of vapor-nozzle set in the secondary lime slaking tube 5-2 17 ejections, compound particles is activated, and makes sorbent particle obtain sufficient activation effect.Hybrid reaction composition granule after the activation forms slaked lime along with gas enters down air draft cyclonic separator 6.
5) slaked lime of quality major part is input to by the air flume 8 that descends air draft cyclonic separator 6 and realizes recirculation in the one-level lime reaction tower 5-1, the slaked lime of quality smaller portions is transported to the slaked lime finished bin by control valve 7 through auger 9 and stores, and the weary gas in the following air draft cyclonic separator 6 can directly be sent into the desulfurization reaction tower inlet.
Claims (8)
1, a kind of method for preparing two-stage slaked lime in use that is used for flue gas desulphurization system, it comprises uses one-level lime reaction tower, secondary lime slaking tube to reach air draft cyclonic separator down, and its algorithm is:
1), mixes back formation fluidized mixture with the unslaked lime material that the bottom of one-level lime reaction tower is imported with the bottom input of fluidized wind by one-level lime reaction tower;
2) the Venturi section of fluidized mixture process one-level lime reaction tower enters the awl column body segment diffusion of one-level lime reaction tower, with multi-level water spray system generation digestion reaction formation gas, liquid, solid three-phase mixed reactant set in the one-level lime reaction tower;
3) fall back to formation internal recycle in the one-level lime reaction tower behind the bump of particle that a part of terminal flow velocity is bigger in the mixed reactant and one-level lime reaction tower direct tube section top, remaining particle is along with gas enters secondary lime slaking tube;
4) quick digestion reaction takes place in the high-temperature water vapor that is sprayed in mixed reactant and the secondary lime slaking tube, and the hybrid reaction composition granule behind overactivation forms slaked lime along with gas enters down the air draft cyclonic separator;
5) slaked lime of quality major part is input to by the skewed slot that descends the air draft cyclonic separator and realizes recirculation in the one-level lime reaction tower, the slaked lime of quality smaller portions is transported to the slaked lime finished bin by control valve through auger and stores, and the weary gas in the following air draft cyclonic separator can directly be sent into the desulfurization reaction tower inlet.
According to the described method for preparing two-stage slaked lime in use that is used for flue gas desulphurization system of claim 1, it is characterized in that 2, the warm air of described fluidized wind for blasting with gas blower, warm air are the normal temperature air of heater via heating.
3, according to the described method for preparing two-stage slaked lime in use that is used for flue gas desulphurization system of claim 1, it is characterized in that, described multi-level water spray system is made up of two-layer, the bottom water spray system places in the awl column body segment of one-level lime reaction tower, the upper strata water spray system places in the direct tube section of one-level lime reaction tower, and each layer water spray system adopts two-fluid spray nozzle to be arranged in one-level lime reaction tower center.
4, according to claim 1, the 2 or 3 described method for preparing two-stage slaked lime in use that are used for flue gas desulphurization system, it is characterized in that, the fluidizing velocity of fluidized wind is 1～10m/s in the described one-level lime reaction tower, and the fluidizing velocity of Venturi section quicklime particles is 14～18m/s.
5, realize the described device that is used for the method for preparing two-stage slaked lime in use of flue gas desulphurization system of claim 1, it comprises one-level lime reaction tower (5-1), secondary lime slaking tube (5-2) reaches air draft cyclonic separator (6) down, it is characterized in that, described one-level lime reaction tower (5-1) is to be formed by connecting by direct tube section and awl column body segment, the bottom of awl column body segment is provided with Venturi section (3), Venturi section (3) is connected with former feed bin (12), be equipped with unslaked lime import (1) on the former feed bin (12), the bottom of former feed bin (12) is cone (14), be equipped with fluidized wind import (2) on the cone (14), be provided with the spaced apart water-jet of multilayer (4) in the one-level lime reaction tower (5-1), the outlet of one-level lime reaction tower (5-1) top links to each other with the inlet of described secondary lime slaking tube (5-2), be provided with spray vapour nozzle (17) in the secondary lime slaking tube (5-2), the lower part outlet of secondary lime slaking tube (5-2) is connected with the inlet of following air draft cyclonic separator (6), the bottom surface of following air draft cyclonic separator (6) is tapered plane (10), be equipped with vapor pipe (11) on the tapered plane (10), the bottom of tapered plane (10) is equipped with the two channels (15) that is opened and closed by two-way control valve (7) control, the carrier pipe (16) that one side of two channels (15) connects air flume (8) and is communicated with the bottom of secondary lime slaking tube (5-2), air flume (8) bottom is connected with one-level lime reaction tower (5-1) awl column body segment bottom, and the opposite side of two channels (15) connects the auger (9) of carrying finished product.
6, according to the described device that is used for the method for preparing two-stage slaked lime in use of flue gas desulphurization system of claim 5, it is characterized in that, be provided with two-layer spaced apart water-jet (4) in the described one-level lime reaction tower (5-1), wherein bottom water-jet (4) places in the awl column body segment of one-level lime reaction tower (5-1), upper strata water-jet (4) places in the direct tube section of one-level lime reaction tower (5-1), and each water-jet (4) adopts two-fluid spray nozzle to be arranged in one-level lime reaction tower (5-1) center.
According to the described device that is used for the method for preparing two-stage slaked lime in use of flue gas desulphurization system of claim 6, it is characterized in that 7, the bottom of described cone (14) is equipped with the ash port (13) that is opened and closed by control valve (7) control.
8, according to claim 5, the 6 or 7 described devices that are used for the method for preparing two-stage slaked lime in use of flue gas desulphurization system, it is characterized in that described each control valve (7) is a star valve.
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| CNB2004101018579A CN100336755C (en) | 2004-12-29 | 2004-12-29 | Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment |
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| CNB2004101018579A CN100336755C (en) | 2004-12-29 | 2004-12-29 | Method for preparing two-stage slaked lime in use for flue gas desulfurization system and equipment |
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| CN108640538A (en) * | 2018-07-04 | 2018-10-12 | 江苏佳鑫环保工程有限公司 | Quick lime recirculating fluidized bed is classified dry digestive system |
| CN110385032A (en) * | 2019-06-19 | 2019-10-29 | 无锡威实工业成套设备有限公司 | A method of it reducing desulfurization waste of steam and reduces desulfurization lime consumption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425491A (en) * | 2002-12-09 | 2003-06-25 | 武汉凯迪电力股份有限公司 | Composite Circulation fluidized dry desulfurization process for flue gas and desalfurizing reaction tower |
| CN2767443Y (en) * | 2004-12-29 | 2006-03-29 | 清华大学 | Two-stage lime hydrate preparation apparatus for flue gas desulfurization system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425491A (en) * | 2002-12-09 | 2003-06-25 | 武汉凯迪电力股份有限公司 | Composite Circulation fluidized dry desulfurization process for flue gas and desalfurizing reaction tower |
| CN2767443Y (en) * | 2004-12-29 | 2006-03-29 | 清华大学 | Two-stage lime hydrate preparation apparatus for flue gas desulfurization system |
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