CN103977664A - Flue gas desulfurization, denitration and dust removal method - Google Patents

Flue gas desulfurization, denitration and dust removal method Download PDF

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Publication number
CN103977664A
CN103977664A CN201410208569.7A CN201410208569A CN103977664A CN 103977664 A CN103977664 A CN 103977664A CN 201410208569 A CN201410208569 A CN 201410208569A CN 103977664 A CN103977664 A CN 103977664A
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China
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flue gas
dust
spray absorber
denitration
desulfurization
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CN201410208569.7A
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Chinese (zh)
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CN103977664B (en
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赵成
赵鑫
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山西清泽环境科技有限公司
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Abstract

The invention provides a flue gas desulfurization, denitration and dust removal method. The method comprises the following steps: a desulfurizer supply system introduces alkali liquor into a spray absorption tower; after entering the spray absorption tower, flue gas is in countercurrent contact with mist recycling slurry, and the recycling slurry absorbing SO2 falls into an absorption tower slurry basin; absorption liquid absorbing SO2 is sent to a primary sedimentation basin and then flows into a lime reactor for regeneration reaction and enters an aeration basin; waste water reenters a desulfurization system for recycling, and an automatic control system adopts an operation desk for centralized control; the flue gas enters a low-temperature denitration device and realizes low-temperature denitration reaction; the flue gas exhausted from a boiler smoke outlet is subjected to desulfurization through the spray absorption tower firstly and then enters a cyclone dust remover and a water film dust remover for dust removal, and the flue gas after desulfurization and dust removal is exhausted in air from a flue gas outlet of the water film dust remover. The method has the advantages of high desulfurization, denitration and dust removal efficiencies, small investment, low operating cost and convenience in maintenance and management and can realize automation control and intelligent control.

Description

A kind of method of flue gas desulfurization denitration dust-removing

Technical field

The present invention relates to the desulphurization denitration of boiler smoke and the technical field of dedusting, particularly a kind of method of flue gas desulfurization denitration dust-removing.

Background technology

At present, coal accounts for 75% left and right of China's demand for energy, coal burning produce sulphur, chlorine, nitrogen oxide be the primary pollution source of atmosphere pollution, heavy damage ecological environment, harm humans health.The boiler of existing many large-scale power stations and Industrial Boiler are the main emission sources of this kind of pollution, although carried out there is certain research for desulfur denitrate dust collecting field both at home and abroad at present, but because existing equipment exists, cost is high, processed complex, and the situations such as the comprehensive effectiveness that has while desulphurization and denitration and dedusting is not good, therefore, lack a kind of reliable integrated desulfurization of economy, denitration, dedusting equipment that can adapt to China's coal-fired plant boiler, Industrial Boiler and other Industrial Stoves, make its industrialization and form production scale.

Summary of the invention

The present invention proposes a kind of method of flue gas desulfurization denitration dust-removing, and its desulphurization and denitration, efficiency of dust collection are high, small investment, and operating cost is low and maintenance management convenient, can realize automation and intelligent control, has solved defect of the prior art.

Technical scheme of the present invention is achieved in that

A kind of method of flue gas desulfurization denitration dust-removing, wherein desulfur denitrate dust collecting system comprises desulphurization system, denitrating system and dust pelletizing system, and described desulphurization system comprises that desulfurizing agent feed system, front end are provided with the spray absorber of Venturi tube, desulfurizer regeneration and the circulatory system, dewatering system and automatic control system; Described denitrating system comprises economizer, deduster and chimney; Described dust pelletizing system comprises cyclone dust collectors and water dust scrubber; It is characterized in that: the step that the method comprises is as follows:

(1) by described desulfurizing agent feed system, alkali lye is stored in to lye tank (vat), and squeezes into the forebay of described spray absorber with pump, in pump forebay, pH value is adjusted to after desired value, squeezes into spray absorber by circulating pump;

(2) in described spray absorber, be provided with Venturi rod layer, flue gas is entered after spray absorber and vaporific recirculation slurries counter current contacting from nozzle ejection by side air inlet, has absorbed SO 2recirculation slurries fall into slurry pool of absorption tower;

(3) described desulfurizer regeneration and the circulatory system comprise primary sedimentation basin and lime reaction device, the SO that made the absorption of discharging from described spray absorber 2absorption liquid flow into lime reaction device after being sent to described primary sedimentation basin, carry out regenerative response, the pH value in lime stock tank is controlled between 10-11, then enter aeration tank;

(4) described dewatering system utilization is grabbed bucket the desuifurized eliminating in described primary sedimentation basin, and waste water is reentered in desulphurization system recycle, described automatic control system adopts operating desk centralized Control, and the device of realizing desulphurization system starts, normally moves supervision, adjustment, shutdown and the accident treatment of industrial and mineral;

(5) between described deduster and chimney, be provided with low-temperature denitration device, described low-temperature denitration device is communicated with the water supply system of described boiler, utilize the heat heating part boiler feedwater of flue gas, flue gas enters the out of stock device of low temperature and realizes low-temperature denitration reaction;

(6) from boiler smoke outlet flue gas out first by spray absorber desulfurization, then enter cyclone dust collectors and water dust scrubber dedusting, the flue gas after desulfurization and dedusting enters air from water dust scrubber exhanst gas outlet.

As the preferred embodiment of one of the present invention, the main component of described alkali lye is NaCO 3and NaOH.

As the preferred embodiment of another kind of the present invention, the slurry spraying system of described spray absorber inside, by distributing pipe network and nozzle to form, for controlling spray flux, makes flue gas flow direction even, makes slurries fully contact and react with flue gas.

As the preferred embodiment of another kind of the present invention, demister is arranged on the top of described spray absorber, the droplet of carrying secretly in order to separate clean flue gas.

As the preferred embodiment of another kind of the present invention, when described lime reaction device is made regenerative agent with lime, the concentration of the active alkali in described spray absorber is controlled at 0.15-0.4mol/L, and the concentration range of spray absorber exudate containing sulfate is 0.5-0.8mol/L.

Beneficial effect of the present invention is:

The invention provides a kind of method of flue gas desulfurization denitration dust-removing, the method that has adopted desulphurization system, denitrating system and dust pelletizing system to control respectively, its desulphurization and denitration, efficiency of dust collection are high, small investment, operating cost is low and maintenance management convenient, can realize automation and intelligent control.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the process chart of the method for a kind of flue gas desulfurization denitration dust-removing of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

As shown in Figure 1, a kind of method of flue gas desulfurization denitration dust-removing, comprises that the desulfurizing agent feed system using in desulphurization system will mainly comprise NaCO in the present invention 3be stored in lye tank (vat) with the alkali lye of NaOH composition, and squeeze into the forebay of spray absorber with pump, in pump forebay, pH value is adjusted to after desired value, squeezes into spray absorber by circulating pump; In spray absorber, be provided with Venturi rod layer, described spray absorber inside can arrange slurry spraying system, it is by distributing pipe network and nozzle to form, be used for controlling spray flux, make flue gas flow direction even, make slurries fully contact and react with flue gas, flue gas is entered after spray absorber and vaporific recirculation slurries counter current contacting from nozzle ejection by side air inlet, has absorbed SO 2recirculation slurries fall into slurry pool of absorption tower, also demister can be arranged on to the top of described spray absorber, the droplet of carrying secretly in order to separate clean flue gas; Make from spray absorber discharge absorption SO 2absorption liquid flow into lime reaction device after being sent to the primary sedimentation basin of desulfurizer regeneration and the circulatory system, when described lime reaction device is made regenerative agent with lime, the concentration of the active alkali in described spray absorber is controlled at 0.15-0.4mol/L, the concentration range of spray absorber exudate containing sulfate is 0.5-0.8mol/L, while carrying out regenerative response, the pH value in lime stock tank is controlled between 10-11, then enters aeration tank; Dewatering system utilization is grabbed bucket the desuifurized eliminating in described primary sedimentation basin, and waste water is reentered in desulphurization system recycle; Automatic control system adopts operating desk centralized Control, and the device of realizing desulphurization system starts, normally moves supervision, adjustment, shutdown and the accident treatment of industrial and mineral; Between the deduster of denitrating system and chimney, be provided with low-temperature denitration device, and be communicated with the water supply system of boiler, utilize the heat heating part boiler feedwater of flue gas, flue gas enters the out of stock device of low temperature and realizes low-temperature denitration reaction; From boiler smoke outlet flue gas out first by spray absorber desulfurization, then enter cyclone dust collectors and water dust scrubber dedusting in dust pelletizing system, the flue gas after desulfurization and dedusting enters air from water dust scrubber exhanst gas outlet.

In desulfurizer, the exhaust gas volumn when gas treatment ability of spray absorber is boiler 100%MCR operating mode, desulfuration efficiency is according to being not less than 90% design, and in dust arrester, efficiency of dust collection is according to being not less than 95% design.In this programme, can adopt calcium and sodium double alkali method desulfurizing technology, use solubility large, to SO 2affinity is strong, alkali lye (for example NaOH, Na that product is less scaling 2cO 3, NaHCO 3the aqueous solution) absorb the SO in flue gas 2, then can outside spray absorber, in mixing pit, absorb SO with lime regeneration 2after slurries, generate CaSO 3and CaSO 4precipitation, supernatant returns to absorption system and recycles.

Boiler discharge flue gas enter spray absorber front end through air-introduced machine Venturi tube dedusting after, in spray absorber taking containing active soda lye as desulfurizing agent, to containing SO 2flue gas carry out spray washing, be SO 2thereby with the alkaloid substance generation chemical reaction in slurries by SO 2remove.Flue gas after purification is discharged by spray-absorption tower top after demister gas-water separation, and the doctor solution of discharging at the bottom of tower flows into regenerated reactor after flowing into primary sedimentation basin again, carry out regenerative response with lime, the circulation fluid after regeneration can continue to flow into secondary sedimentation tank, the CaSO that regenerative response is generated 3and CaSO 4fully precipitation, the supernatant of sedimentation basin flows into spray absorber to liquid bath, then returns spray absorber with pump and complete this and recycle, and makes solid easily precipitate and be conducive to the recovery of sodium.

The flowing velocity of the flue gas in spray absorber has affected the time of desulphurization reaction gas-liquid contact, thereby has affected desulfuration efficiency, and velocity of flue gas is larger, and time of contact is just shorter, and in the situation that other condition is the same, desulfuration efficiency just may be low, otherwise high.Meanwhile, flow of flue gas speed has also affected the water content of carrying in flue gas, and the velocity of flue gas slurry drops that more Gao Zeqi carries is just more, on the contrary may be fewer.In this programme, the velocity of flue gas in spray absorber is controlled at below 3.0m/s, the reaction time is greater than 4s.

The ratio of loop slurry and flue gas flow is that liquid-gas ratio is the important parameter that affects desulfuration efficiency, for ensureing certain desulfuration efficiency, for different SO 2the flue gas of concentration, different flue gas SO 2emission request, desulfurizing agent of different nature, different desulphurization reaction tower structures, just needs different liquid-gas ratios.Under identical condition, the larger desulfuration efficiency of liquid-gas ratio is higher, but the consumption of power is also just larger thereupon, the temperature of exhanst gas outlet is also just lower, therefore, will be according to actual conditions, in conjunction with applicable liquid-gas ratio, in ensureing desulfuration efficiency, reduce operating cost, in the time using alkali lye for desulfurizing agent, can consider that liquid-gas ratio is 2L/m 3.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (5)

1. the method for a flue gas desulfurization denitration dust-removing, wherein desulfur denitrate dust collecting system comprises desulphurization system, denitrating system and dust pelletizing system, and described desulphurization system comprises that desulfurizing agent feed system, front end are provided with the spray absorber of Venturi tube, desulfurizer regeneration and the circulatory system, dewatering system and automatic control system; Described denitrating system comprises economizer, deduster and chimney; Described dust pelletizing system comprises cyclone dust collectors and water dust scrubber; It is characterized in that: the step that the method comprises is as follows:
(1) by described desulfurizing agent feed system, alkali lye is stored in to lye tank (vat), and squeezes into the forebay of described spray absorber with pump, in pump forebay, pH value is adjusted to after desired value, squeezes into spray absorber by circulating pump;
(2) in described spray absorber, be provided with Venturi rod layer, flue gas is entered after spray absorber and vaporific recirculation slurries counter current contacting from nozzle ejection by side air inlet, has absorbed SO 2recirculation slurries fall into slurry pool of absorption tower;
(3) described desulfurizer regeneration and the circulatory system comprise primary sedimentation basin and lime reaction device, the SO that made the absorption of discharging from described spray absorber 2absorption liquid flow into lime reaction device after being sent to described primary sedimentation basin, carry out regenerative response, the pH value in lime stock tank is controlled between 10-11, then enter aeration tank;
(4) described dewatering system utilization is grabbed bucket the desuifurized eliminating in described primary sedimentation basin, and waste water is reentered in desulphurization system recycle, described automatic control system adopts operating desk centralized Control, and the device of realizing desulphurization system starts, normally moves supervision, adjustment, shutdown and the accident treatment of industrial and mineral;
(5) between described deduster and chimney, be provided with low-temperature denitration device, described low-temperature denitration device is communicated with the water supply system of described boiler, utilize the heat heating part boiler feedwater of flue gas, flue gas enters the out of stock device of low temperature and realizes low-temperature denitration reaction;
(6) from boiler smoke outlet flue gas out first by spray absorber desulfurization, then enter cyclone dust collectors and water dust scrubber dedusting, the flue gas after desulfurization and dedusting enters air from water dust scrubber exhanst gas outlet.
2. the method for a kind of flue gas desulfurization denitration dust-removing according to claim 1, is characterized in that: the main component of described alkali lye is NaCO 3and NaOH.
3. the method for a kind of flue gas desulfurization denitration dust-removing according to claim 1, it is characterized in that: the slurry spraying system of described spray absorber inside is by distributing pipe network and nozzle to form, be used for controlling spray flux, make flue gas flow direction even, make slurries fully contact and react with flue gas.
4. the method for a kind of flue gas desulfurization denitration dust-removing according to claim 1, is characterized in that: demister is arranged on the top of described spray absorber, the droplet of carrying secretly in order to separate clean flue gas.
5. the method for a kind of flue gas desulfurization denitration dust-removing according to claim 1, it is characterized in that: when described lime reaction device is made regenerative agent with lime, the concentration of the active alkali in described spray absorber is controlled at 0.15-0.4mol/L, and the concentration range of spray absorber exudate containing sulfate is 0.5-0.8mol/L.
CN201410208569.7A 2014-05-16 2014-05-16 A kind of method of flue gas desulfurization denitration dust-removing CN103977664B (en)

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Publication number Priority date Publication date Assignee Title
CN104117278A (en) * 2014-08-15 2014-10-29 大丰市佳诣电力燃料有限公司 Dust removal, desulfurization and denitrification integrated tower and dust removal, desulfurization and denitrification integrated system
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CN104740992B (en) * 2015-03-20 2017-06-27 凯天环保科技股份有限公司 A kind of carbide slag gypsum flue gas deep desulfuration dust arrester and method
CN104841271A (en) * 2015-05-27 2015-08-19 山东应天节能环保科技有限公司 Desulfurization and denitrification automatic control system
CN104857853A (en) * 2015-05-27 2015-08-26 山东应天节能环保科技有限公司 Conveying device for conveying powdery catalyst according to sulfur and nitrate content in flue gas
CN106076096A (en) * 2016-08-05 2016-11-09 重庆智库能源管理有限公司 Flue gas desulphurization system and technique

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