CN202823129U - Flue gas cleaning device of spray drying method combined with hydrated lime powder spraying - Google Patents

Flue gas cleaning device of spray drying method combined with hydrated lime powder spraying Download PDF

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Publication number
CN202823129U
CN202823129U CN 201220421135 CN201220421135U CN202823129U CN 202823129 U CN202823129 U CN 202823129U CN 201220421135 CN201220421135 CN 201220421135 CN 201220421135 U CN201220421135 U CN 201220421135U CN 202823129 U CN202823129 U CN 202823129U
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China
Prior art keywords
flue gas
dry powder
lime
hydrated lime
spray drying
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CN 201220421135
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Chinese (zh)
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任少清
张星群
裘晓云
吴钦宝
沈华忠
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XINSHIJI ENERGY ENVIRONMENTAL PROTECTION ENGINEERING Co Ltd HANGZHOU
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XINSHIJI ENERGY ENVIRONMENTAL PROTECTION ENGINEERING Co Ltd HANGZHOU
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Abstract

The utility model relates to a flue gas cleaning device of spray drying method combined with hydrated lime powder spraying and aims at providing a device which is capable of enabling a garbage incinerator to stably achieve the requirement of flue gas emission. The flue gas cleaning device of the spray drying method combined with the hydrated lime powder spraying comprises a flue gas distributor, a rotating sprayer, a reaction tower, a bag-type dust remover, an induced draft fan and a chimney in sequence, a flue gas inlet is formed in the front end of the flue gas distributor, the bag-type dust remover is communicated with the reaction tower through a venturi tube, the flue gas cleaning device of the spray drying combined with the hydrated lime powder spraying further comprises a control system, and the control system is communicated with two detectors which are arranged on the inner wall of the flue gas inlet and are used for measuring flue gas inlet temperature and the content of acid gas. The flue gas cleaning device of the spray drying method combined with the hydrated lime powder spraying is characterized by further being provided with a hydrated lime dry powder spraying system, the hydrated lime powder spraying system comprises a flue gas mixer 1B, a dry powder storage bin and a dry powder conveying device, the flue gas mixer 1B is arranged between the flue gas inlet and the flue gas distributor, the dry powder storage bin is arranged outside the flue gas mixer 1B, and the dry powder conveying device is used for conveying lime dry powder in the dry powder storage bin to the flue gas mixer 1B through pipelines.

Description

The smoke eliminator that a kind of spray drying process combination hydrated lime in powder sprays
Technical field
The utility model relates to field of Environment Protection, specifically is used for the smoke eliminator of the sour gas of removal flue gas that waste incineration produces.
Background technology
The article that house refuse includes are numerous, the plastic articles that wherein has people to discard; So not only contain pernicious gas and the flying dust such as carbon monoxide, sulfur dioxide in the flue gas that consumer waste incineration produces, also contain such as toxic gases such as hydrogen chloride, Buddhist hydrogen, dioxin, heavy metal Hgs.Therefore, in today of strengthen environmental protection, for the environmental requirement of increasingly stringent, the function of smoke eliminator is subject to people's common concern.
Present smoke eliminator, the form that whether produces waste water or used nertralizer according to this device can be divided into wet method, dry method, spray drying process and circular suspension type semi-dry etc.Wherein the cost of investment of flue gas clenear by wet is higher, and the waste water of its generation causes secondary pollution because containing heavy metal element, so generally be not used in the gas cleaning of consumer waste incineration.The dry method flue gas purifier is to spray Ca (OH) by the entrance toward sack cleaner 2Powder is realized purifying, and is too low to the utilization rate of nertralizer although this system does not produce waste water, and can't guarantee desulfurization degree, so the trend of being abandoned is arranged.For the flue gas that waste incineration produces, current especially to adopt rotary spraying technique and circulating fluid bed type, also claim the circular suspension type semi-dry flue gas purification system just many.But from behaviour in service, although the circular suspension type semi-dry purifier can reuse flying dust that deduster separates, reduce the consumption of nertralizer, sack cleaner can increase reduction of service life because of burden; Owing to the geometric properties of circular suspension type flue gas processing device itself, along with the increase of injection flow rate, will cause the problems such as glutinous wall simultaneously, thereby cause the increase of Operation and Maintenance amount.The rotary sprayer technology is used wider at present at home, especially large-scale burning power plant; Being different from the recirculating fluidized bed method can adopt dry powder as nertralizer, spray drying process mainly adopts self-control lime white solution as the depickling medium, quality requirement to lime white is relatively high, fog-spray nozzle, stock line, stock pump etc. are prone to problems such as stopping up wearing and tearing, in case load variations is large or the temperature of entrance or the content of acid gas fluctuation is large and boiler at low load, can't in time adjust the concentration of lime white or when atomizer overhauls, lime white can't be sprayed, so that the emission request of depickling can't be satisfied.Affect the deacidifying flue gas effect.
The utility model content
The purpose of this utility model is to overcome the existing existing shortcoming of smoke eliminator, the smoke eliminator that provides a kind of spray drying process combination hydrated lime in powder to spray, this device should be able in load, flue-gas temperature, when the content of acid gas fluctuation is larger, still can make the stable requirement that realizes fume emission of incinerator.
The technical solution adopted in the utility model is: the smoke eliminator that a kind of spray drying process combination hydrated lime in powder sprays, sequentially comprise sack cleaner, air-introduced machine and chimney that front end is provided with the smoke distributor of smoke inlet, rotary sprayer, reaction tower, is communicated with reaction tower by Venturi tube, also comprise a control system, this control system is connected and is located on the gas approach inwall to be used for measuring two detectors of cigarette temperature and content of acid gas; It is characterized in that this smoke eliminator also is furnished with a white lime dry powder spraying system, this white lime dry powder spraying system comprise the flue gas blender 1B that is arranged between smoke inlet and the smoke distributor, the dry powder bunker that is arranged on flue gas blender outside and by pipeline with the dry powder conveying device in the input of the lime dry powder in the dry powder bunker flue gas blender.
Described flue gas blender is the cylindrical shell of the thinner venturi-type in thick centre, two ends, the dry powder playpipe that one end is communicated with the dry powder bunker stretches in the flue gas blender from the outside, the injector head of this dry powder playpipe is positioned at the cylindrical shell central part, and lime dry powder injection direction is opposite with the flue gas input direction of smoke inlet.
Described dry powder playpipe enters in the flue gas blender after passing through the barrel wall section of flue gas blender.
Operation principle of the present utility model is: owing to disposed white lime dry powder spraying system, thereby work as incinerator because of reasons such as combustion conditions or component of refuse fluctuations, and when causing the fume emission index unstable, can adopt this kind flue gas processing device to solve; Mainly comprise following several operating mode:
1) flue-gas temperature is excessively low
Because containing large quantity of moisture in the slurries, when flue-gas temperature excessively low, the slurries that rotary sprayer sprays into can't reach the purpose of depickling, can't guarantee that also the sack cleaner exit gas temperature is at the above 10-20 of dew-point temperature ℃, this will cause the sour gas discharging can't reach requirement, and the filter bag of sack cleaner can't normally use simultaneously.At this moment, the utility model can according to the temperature signal of smoke inlet feedback, in spraying system guarantees normal range of operation, stop water spray so that the deduster outlet temperature rises to normal level; Simultaneously, according to the content of acid gas of on-line monitoring, drop into lime dry powder and spray, thus the discharge index of assurance sour gas.
2) acid gas in flue gas too high levels
When the acid gas in flue gas too high levels, because the restriction of concentration of slurry, maximum although the whitewashing amount reaches, the sack cleaner inlet temperature is in normal range (NR), and sour gas still can't reach requirement; Control system will be opened lime dry powder spraying system and spray lime dry powder automatically according to the feedback information of on-line monitoring this moment, thereby guaranteed the discharging of sour gas.
3) flue-gas temperature and content of acid gas are lower
When flue-gas temperature and content of acid gas are low, can reduce the whitewashing amount of rotary sprayer.In the normal range (NR) of sack cleaner inlet temperature, by spraying lime dry powder to reach the depickling requirement; Concrete steps be control system according to the feedback information of on-line monitoring, open lime dry powder and spray, reduce simultaneously the whitewashing amount, thereby guarantee the discharging of sour gas and the temperature that enters sack cleaner.
4) when rotary sprayer overhauls
When the rotary sprayer ad hoc inspection and repair, absorb by the absorption that sprays into lime dry powder and sack cleaner filter bag, can satisfy the emission request of flue gas.
In addition, break down when the lime white system; At this moment, as back-up system, can by water spray and the injection lime dry powder of rotary sprayer, reach the requirement of depickling discharging.
The beneficial effects of the utility model are: joined white lime dry powder spraying system owing to increase in original smoke eliminator, can effectively tackle because the incinerator reason causes loading, flue-gas temperature, problem that the content of acid gas fluctuation is larger, guarantee the normal effectively work of smoke eliminator, make the flue gas of discharging reach normal discharge standard.
Description of drawings
Fig. 1 is system architecture schematic diagram of the present utility model.
Fig. 2 is the structural representation of the flue gas blender in the utility model.
Fig. 3 is the A section structure for amplifying schematic diagram among Fig. 2.
The specific embodiment
Below further specify by embodiment shown in the drawings.
As shown in the figure: this device sequentially comprise gas approach 1A, smoke distributor 1C, rotary sprayer 1D(can be respectively or spray simultaneously desuperheating water, lime white and cooling-air), reaction tower 1, and Venturi tube 1G, sack cleaner 2, air-introduced machine 3 and the chimney 4 used with the injection active carbon that reaction tower exhanst gas outlet 1F sequentially is connected; The reaction tower bottom also is provided with flying dust outlet 1E; Said structure is all identical with existing smoke eliminator.
Improvement of the present utility model is that flue gas blender 1B is set between smoke inlet and smoke distributor, this flue gas blender has formed lime dry powder spraying system jointly with the dry powder bunker that is arranged on the outside and by the dry powder conveying device of pipeline with the input of the lime dry powder in dry powder bunker flue gas blender.
When using the utility model device, from the interior acid gas-containing of domestic waste incineration such as the flue gas of the toxic gas such as HCl, SOx, HF and dioxin and flying dust, 1A enters from gas approach, enter the smoke distributor 1C at reaction tower top through blender 1B, mix with desuperheating water and slurries that rotary sprayer 1D sprays into, white lime dry powder fully mixes with flue gas at smoke distributor, mix with contact in carry out following depickling and react:
SO 2+Ca(OH) 2+H 2O=CaSO 3+2H 2O
2HCl+Ca(OH) 2=CaCl 2+2H 2O
2HF+Ca(OH) 2=CaF 2+2H 2O;
The temperature of said process must drop in the proper range, is that reduction with temperature increases because absorb the ability of acid ingredient in the flue gas, but the trend that too low temperature is stuck with paste bag with bonding and the filter bag of flying dust in the intensified response tower; Take into account this two factors, the water capacity of general control sack cleaner outlet is about 6%.
Leave reaction tower through taking off acid-treated flue gas from the exhanst gas outlet 1F at top, and enter successively Venturi tube 1G, the sack cleaner 2 that sprays active carbon, in succession further remove dioxin by active carbon, dedusting in the sack cleaner, flue gas after the purification is delivered to chimney 4 by air-introduced machine 3, then enters atmosphere.
Above-mentioned deacidification also is the removal process of the toxic gases such as dioxin simultaneously, and in the reaction tower absorption of acid gases, the charcoal absorption that the toxic gases such as bioxin are injected in active carbon mixer 3 thereafter is clean.
Lime white provides (lime white concentration is set up according to concrete needs) by pulping system, then sprays in the reaction tower from rotary sprayer 1D by pipeline.This pulping system comprises bunker, conveyer, digester and the agitator that from up to down arranges; Lime is expected on the conveyer under bunker, is sent in the digester by conveyer and mixes with water, can become the lime white that required usefulness is reacted in depickling after stirring.Obviously, this pulping system is conventional equipment.
The used lime dry powder of white lime dry powder spraying system is the Ca (OH) through pulverizing 2Dry powder (be white lime dry powder, the fineness of this dry powder is determined as required, usually can be selected 150 orders-250 order), they are confessed by the dry powder bunker, by pipeline and dry powder conveying device (air pump normally; Omit among the figure) spray in the reaction tower by flue gas blender 1B.Described dry powder bunker and dry powder conveying device are existing apparatus, can directly divert from one use to another or the outsourcing adapted.
Among Fig. 2 as seen: described flue gas blender is the cylindrical shell of two ends thinner venturi-type in the middle of thick, and the dry powder playpipe 1B-1 that an end is communicated with the dry powder bunker (shows it is to enter after passing through the barrel wall section of flue gas blender Fig. 2 in the flue gas blender is stretched in the outside; Also can stretch into from other position), the injector head of this dry powder playpipe is positioned at the cylindrical shell central part, and lime dry powder injection direction is opposite with the flue gas input direction (direction shown in the arrow S) of smoke inlet.
Because above-mentioned lime white spraying system, white lime dry powder spraying system can independently use or simultaneously use, and the inwall at gas approach is provided with two detectors can measuring cigarette temperature and content of acid gas, therefore this device can be according to the size of the flue-gas temperature that detects online, content of acid gas, enable fast spray lime white or spray lime dry powder, perhaps spray simultaneously lime white and spray lime dry powder.
Enable spray lime white, spray lime dry powder or spray simultaneously the lime white applying working condition different with spraying three kinds in lime dry powder and be:
1) when the flue-gas temperature of reaction tower entrance is very low, for the inlet temperature that guarantees sack cleaner in rational normal operating range, when reaching when needing flue-gas temperature, because the restriction of the concentration of lime white and can't satisfy the emission request of sour gas, can automatically enable simultaneously the ripe grey dry powder spraying system of stone this moment, so that the discharging flue gas reaches the depickling requirement;
2) when the content of the flue-gas temperature of reaction tower entrance and sour gas in normal range of operation, namely use separately rotary sprayer, can reach the serviceability temperature of sack cleaner and the requirement of fume emission, can adopt separately rotary sprayer this moment;
3) when the entrance load variations, although the temperature of reaction tower gas approach is in normal desuperheat scope, but when the content of the sour gas in the flue gas is relatively high, the rotary sprayer whitewashing was sprayed and can only be satisfied the cooling requirement this moment, and can't reach the depickling emission request, must open simultaneously white lime dry powder spraying system this moment, under the prerequisite that satisfies the requirement of deduster entrance flue gas temperature, according to the content of acid gas of feedback, by spraying into the consumption of hydrated lime in powder, in reaching and purpose;
When 4) fluctuation of bigger than normal, the system loading of acid gas in flue gas content is more frequent, also can adopt simultaneously spray lime dry powder and spray lime slurry to carry out depickling.
In addition, when the composition of entrance sour gas is lower, or the shotcrete pipe road can start separately lime dry powder spraying system, to satisfy emission request when fault occurring and during the atomizer ad hoc inspection and repair.
M among the figure represents electrical header.

Claims (3)

1. a spray drying process makes up the smoke eliminator that hydrated lime in powder sprays ,Comprise that sequentially front end is provided with the smoke distributor of smoke inlet (1A) (1C), rotary sprayer (1D), reaction tower (1), passes through sack cleaner (2), air-introduced machine (3) and chimney (4) that Venturi tube (1G) is communicated with reaction tower; Also comprise a control system, this control system is connected and is located on the gas approach inwall to be used for measuring two detectors of cigarette temperature and content of acid gas; It is characterized in that this smoke eliminator also is furnished with a white lime dry powder spraying system, this white lime dry powder spraying system comprise the flue gas blender (1B) that is arranged between smoke inlet and the smoke distributor, the dry powder bunker that is arranged on flue gas blender outside and by pipeline with the dry powder conveying device in the input of the lime dry powder in the dry powder bunker flue gas blender.
2. a kind of spray drying process according to claim 1 makes up the smoke eliminator that hydrated lime in powder sprays, it is characterized in that: described flue gas blender is the cylindrical shell of the thinner venturi-type in thick centre, two ends, the dry powder playpipe that one end is communicated with the dry powder bunker stretches in the flue gas blender from the outside, the injector head of this dry powder playpipe is positioned at the cylindrical shell central part, and lime dry powder injection direction is opposite with the flue gas input direction of smoke inlet.
3. the smoke eliminator that sprays of a kind of spray drying process combination hydrated lime in powder according to claim 2 is characterized in that: described dry powder playpipe enters in the flue gas blender after passing through the barrel wall section of flue gas blender.
CN 201220421135 2012-08-23 2012-08-23 Flue gas cleaning device of spray drying method combined with hydrated lime powder spraying Active CN202823129U (en)

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Application Number Priority Date Filing Date Title
CN 201220421135 CN202823129U (en) 2012-08-23 2012-08-23 Flue gas cleaning device of spray drying method combined with hydrated lime powder spraying

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103657393A (en) * 2013-05-17 2014-03-26 上海康恒环境股份有限公司 Dry powder jetting device for flue gas purification
CN104984606A (en) * 2015-07-10 2015-10-21 佛山君帝环保科技有限公司 Synchronous desulphurization and dust removal system shared by multi-tower and multi-kiln and method
CN111013346A (en) * 2019-12-27 2020-04-17 中国科学院过程工程研究所 Electrolytic aluminum flue gas semi-dry desulfurization and defluorination system and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103657393A (en) * 2013-05-17 2014-03-26 上海康恒环境股份有限公司 Dry powder jetting device for flue gas purification
CN104984606A (en) * 2015-07-10 2015-10-21 佛山君帝环保科技有限公司 Synchronous desulphurization and dust removal system shared by multi-tower and multi-kiln and method
CN104984606B (en) * 2015-07-10 2016-10-12 佛山君帝环保科技有限公司 A kind of multitower many kilns common type synchronized desulfuring dust pelletizing system and method
CN111013346A (en) * 2019-12-27 2020-04-17 中国科学院过程工程研究所 Electrolytic aluminum flue gas semi-dry desulfurization and defluorination system and method
WO2021128472A1 (en) * 2019-12-27 2021-07-01 中国科学院过程工程研究所 Semi-dry desulfurization and defluorination system and method for aluminum electrolysis flue gas

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