CN105195004A - Combined desulphurization and dedusting apparatus and method for wet flue gas - Google Patents

Combined desulphurization and dedusting apparatus and method for wet flue gas Download PDF

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Publication number
CN105195004A
CN105195004A CN201510705638.XA CN201510705638A CN105195004A CN 105195004 A CN105195004 A CN 105195004A CN 201510705638 A CN201510705638 A CN 201510705638A CN 105195004 A CN105195004 A CN 105195004A
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flue gas
pipeline
booster
spray pipe
cylindrical shell
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CN201510705638.XA
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李继凤
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李继凤
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Abstract

The invention provides a combined desulphurization and dedusting apparatus and method for wet flue gas. The upper part of the apparatus executes tubular electrostatic dust collection, and the lower part of the apparatus executes alkaline desulphurization. The apparatus comprises a drum; one side of the bottom of drum is provided with a flue gas inlet channel; bottom space of the drum is a buffer pool; the upper part of the flue gas inlet channel is provided with two lower sprinkler pipes; an air flow uniform distribution plate is arranged above the lower sprinkler pipes; the upper part of the air flow uniform distribution plate is an electrostatic dust collection zone; the lower sprinkler pipes and an upper sprinkler pipe are respectively connected with outlets of booster pumps through pipelines; inlets of the booster pumps are connected with the bottom of a neutralizing pool; the top of the neutralizing pool is provided with an alkali lye adding pipeline and connected with an outlet pipeline of a booster pump b; an inlet pipeline of the booster pump b is connected with the central part of a sedimentation basin; the bottom of the sedimentation basin is connected with a waste liquid outlet through a pipeline; the top of the sedimentation basin is connected with the outlet of a booster pump a; and an inlet pipeline of the booster pump a is connected with the bottom of the buffer pool. The combined desulphurization and dedusting apparatus and method mainly overcome the problems of low efficiency, high energy consumption, low utilization rate of waste water and the like of desulphurization and dedusting of tail flue gas of an industrial boiler.

Description

Combined wet-type desulfurating dust removing device for flue gas and method
Technical field:
The present invention relates to air pollution treatment field, be specifically related to combined wet-type desulfurating dust removing device for flue gas and method.
Background technology:
In recent years, along with the generation of haze, increasing people is caused to pay close attention to the pollutant emission situation of air quality and Air Pollutant Emission situation, particularly boiler smoke; The smoke gas treatment starting of station boiler comparatively early, in the strict implement standard of country, at the large-area rebuilding and improving carrying out flue gas, but Industrial Boiler smoke pollution situation but allows of no optimist, at present, the discharge of Industrial Boiler flue gas pollutant exceedes station boiler, becomes the first pollution sources of national industrial trade, and the deep treatment for Industrial Boiler smoke pollution becomes inevitable;
The special emission limit of atmosphere pollution of " emission standard of air pollutants for boilers (GB13271-2014) " that on July 1st, 2014 implements requires: soot dust granule thing≤30mg/Nm 3, SO 2≤ 200mg/Nm 3, nitrogen oxide≤200mg/Nm 3, and the emission limit in key area and eastern part area has required soot dust granule thing≤5mg/Nm 3, SO 2≤ 100mg/Nm 3, this special limit value makes the efficiency of dust collection of fume treatment need reach more than 90%, desulfuration efficiency need reach more than 90%, and more and more stricter emission request makes more Industrial Boiler producer enter in the ranks of tail flue gas environmental transformation;
The desulfurization of Industrial Boiler is divided into dry desulfurization and wet desulphurization two kinds of modes, dry desulfurization generally adopts lime (lime stone) as desulfurizing agent, and have the methods such as in-furnace calcium spraying, the utilization rate of desulfurizing agent is low, and desulfuration efficiency is low, do not reach the limitation standard of country for boiler smoke discharge; Wet desulphurization has limestone-based process, Dual alkali, magnesium oxide method, sodium alkali or ammonia process etc., and limestone-based process is due to system complex, and running pollutes high, and easily causes the problems such as system jams, and general industry boiler is of little use; Other sulfur methods due to the alkalescence of absorbent strong, with SO 2reaction speed fast, absorptivity is high, and sorbent utilization is high, and general desulfuration efficiency can reach more than 90%, but it is more complicated also to there is wastewater treatment, and initial cost is large, and operating cost is also higher;
Dedusting method conventional in Industrial Boiler dedusting is also divided into dry type and wet type two kinds, what dry method was the most frequently used has electric precipitation and bag-type dust, these two kinds of mode equipment are huge, investment and operating cost large, and efficiency of dust collection is lower, do not reach the discharge standard of existing national regulation, the water-bath type dust cleaner that wet dust removal is conventional and gallet water curtain dust collector and wet cottrell, the efficiency of dust collection of water-bath type and granite with water film formula dedusting method is higher, but water consumption is larger, cost of sewage disposal is high, and wet cottrell small volume, due to the existence of electric field force, efficiency of dust collection is very high, concentration of emission≤the 5mg/Nm of flue gas can be reached 3, a large amount of in station boiler application.
Summary of the invention:
Patent of the present invention provides a kind of combined wet-type desulfurating dust removing device for flue gas and method, the problem such as the efficiency mainly solving the tail flue gas desulfurization and dedusting of Industrial Boiler is low, energy consumption is high, and water reuse rate is low.
Technical scheme of the present invention is: combined wet-type desulfurating dust removing device for flue gas, combined by the pipe-type electrostatic dust arrester on top and the alkaline desulfurizer of bottom, wherein device comprises cylindrical shell, cylindrical shell is the cylinder of a setting, side, bottom has gas approach passage, the cylinder body bottom space of the bottom of gas approach passage is Buffer Pool, the top of gas approach passage is provided with twice lower spray pipe, the top of lower spray pipe is provided with airflow uniform distribution plate, airflow uniform distribution plate top is electrostatic precipitation district, the anode tube of some cellular interior hexagonals is hung in the cylindrical shell of electrostatic precipitation district part, the upper space of each anode tube is equipped with shower nozzle, some shower nozzles are by pipeline and be unified into upper spray pipe, cylindrical shell top is provided with exhanst gas outlet, lower spray pipe is connected booster outlet with upper spray pipe respectively by pipeline, booster import connects bottom neutralization pond, neutralization pond top is provided with alkali lye and adds pipeline, neutralization pond top connects booster b outlet conduit, booster b inlet pipeline connects in the middle part of sedimentation basin, pipeline is had to connect waste liquid outlet bottom sedimentation basin, sedimentation basin top connects booster a outlet, bottom booster a inlet pipeline Connection Pool,
Combined wet-type FGD dust collection method, comprise the following steps, flue gas is by gas approach pipeline access to plant, bottom of device is the Buffer Pool of waste liquid after desulfurization, the water of Buffer Pool enters in settling tank through booster a pumping, and settling tank supernatant liquor enters in neutralization pond, in neutralization pond through booster b pumping, add pipeline by alkali lye to add alkali lye and regulate the circulation of the absorbing liquid after PH to enter in lower spray pipe and upper spray pipe, the water of settling tank bottom is expelled to sewage treatment unit, absorbing liquid sprays in cylindrical shell by nozzle atomization in two-layer lower spray pipe, and be dispersed into tiny drop and cover the whole section of cylindrical shell, the alkali lye in these drops contacts with flue gas adverse current in cylindrical shell, and flue gas flow rate keeps 3.2 ~ 4m/s, mass transfer occurs and absorbs SO 2reaction, absorbing liquid is the magnesium hydroxide solution that alkaline solution of sodium hydroxide, sodium carbonate liquor or magnesia are dissolved in that water clears up rear formation, gas after desulfurization is through the backward upper flowing of airflow uniform distribution plate, flue gas flow rate is between 3 ~ 4m/s, enter the electrostatic precipitation district on top, flow through cellular interior hexagonal anode tube, anode tube center is the cathode line of joining with its pole, the bottom-up flowing of flue gas, flue gas flow rate 3 ~ 4m/s, cathode line is discharged under the effect of extraneous high voltage source, grit in the flue gas of Bottomhole pressure and water under electric field action, anode pipe move, and stick in anode tube, flue gas after purification is discharged from top, cleaned under the effect of the absorbing liquid of the interval ejection of the shower nozzle of anode tube in upper spray pipe, Buffer Pool bottom liquid access to plant after cleaning.
The present invention has following beneficial effect: forming integrated wet-desulfurizing dust remover and method by pipe-type electrostatic dedusting and alkaline desulfurization being combined as a whole, first can share a set of water circulation system, investment reduction; Secondly the treating capacity of recirculated water reduces, and operating cost greatly reduces; Again, the interaction of desulfurization and dedusting, makes the desulfurization dust-removing efficiency of device greatly improve, and the concentration of emission of exhanst gas outlet reduces.The application mainly solves the problems such as the efficiency of the tail flue gas desulfurization and dedusting of Industrial Boiler is low, energy consumption is high, and water reuse rate is low.
Accompanying drawing illustrates:
Accompanying drawing 1 is structural representation of the present invention;
Accompanying drawing 2 is A-A views of accompanying drawing 1.
1-Buffer Pool in figure, 2-gas approach passage, 3-cylindrical shell, 4-electrostatic precipitation district, 5-upper spray pipe, 6-lower spray pipe, 7-exhanst gas outlet, 8-booster, 9-neutralization pond, 10-sedimentation basin, 11-waste liquid outlet, 12-alkali lye adds pipeline, 13-anode tube, 14-shower nozzle, 15-airflow uniform distribution plate, 16-booster a, 17-booster b.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the invention will be further described:
Shown in Fig. 1 composition graphs 2, combined wet-type desulfurating dust removing device for flue gas top is pipe-type electrostatic dedusting, bottom is alkaline desulfurization, wherein device comprises cylindrical shell 3, cylindrical shell 3 is the cylinder of a setting, side, bottom has gas approach passage 2, cylindrical shell 3 bottom space of the bottom of gas approach passage 2 is Buffer Pool 1, the top of gas approach passage 2 is provided with twice lower spray pipe 6, the top of lower spray pipe 6 is airflow uniform distribution plate 15, the air-flow of airflow uniform distribution plate 15 pairs of flue gases has the effect of current-sharing, flue gas after current-sharing is conducive to electrostatic precipitation and alkali lye sulphur removal, airflow uniform distribution plate 15 top is electrostatic precipitation district 4, the anode tube 13 of some cellular interior hexagonals is hung in the cylindrical shell 3 of electrostatic precipitation district 4 part, anode tube 13 center is the cathode line of joining with its pole, under electric field action, anode tube 13 is used for adsorbing the grit in flue gas, water and part SO 2material, the upper space of each anode tube 13 is equipped with shower nozzle 14, some shower nozzles 14 are by pipeline and be unified into upper spray pipe 5, shower nozzle 14 and upper spray pipe 5 are used for anode purge pipe 13, cylindrical shell 3 top is provided with exhanst gas outlet 7, lower spray pipe 6 is connected booster 8 with upper spray pipe 5 respectively by pipeline and exports, booster 8 import connects bottom neutralization pond 9, neutralization pond 9 top is provided with alkali lye and adds pipeline 12, neutralization pond 9 top connects booster b17 outlet conduit, booster b17 inlet pipeline connects in the middle part of sedimentation basin 10, pipeline is had to connect waste liquid outlet 11 bottom sedimentation basin 10, sedimentation basin 10 top connects booster a16 outlet, bottom booster a16 inlet pipeline Connection Pool 1,
Combined wet-type FGD dust collection method, comprise the following steps, flue gas is by gas approach pipeline 2 access to plant, and bottom of device is the Buffer Pool 1 of waste liquid after desulfurization, the water of Buffer Pool 1 enters in settling tank 10 through booster a16 pumping, and the water of settling tank 10 bottom is expelled to sewage treatment unit; Settling tank 10 supernatant liquor enters in neutralization pond 9 through booster b17 pumping, in neutralization pond 9, add pipeline 12 by alkali lye to add alkali lye and regulate the circulation of the absorbing liquid after PH to enter in lower spray pipe 6 and upper spray pipe 5, absorbing liquid is sprayed into by nozzle atomization in cylindrical shell 3 in two-layer upper spray pipe 6, be dispersed into tiny drop and cover the whole section of cylindrical shell 3, alkali lye in these drops contacts with flue gas adverse current in cylindrical shell 3, and flue gas flow rate keeps 3.2 ~ 4m/s, mass transfer occurs and absorbs SO 2reaction, absorbing liquid is generally alkaline solution as sodium hydroxide solution, and sodium carbonate liquor or magnesia are dissolved in the magnesium hydroxide solution that water clears up rear formation.Gas after desulfurization is through the backward upper flowing of airflow uniform distribution plate 15, flue gas flow rate is between 3 ~ 4m/s, enter the electrostatic precipitation district 4 on top, flow through cellular interior hexagonal anode tube 13, anode tube 13 center is the cathode line of joining with its pole, the bottom-up flowing of flue gas, flue gas flow rate 3 ~ 4m/s, cathode line is discharged under the effect of extraneous high voltage source, the materials such as the grit in the flue gas of Bottomhole pressure and water under electric field action, anode pipe 13 move, and stick in anode tube 13, flue gas after purification is discharged from top, cleaned under the effect of the absorbing liquid of the interval ejection of the shower nozzle 14 of anode tube 13 in upper spray pipe 5, Buffer Pool 1 bottom liquid access to plant after cleaning.
Alkali absorption method is as the efficient fume desulphurization method of one, and have system liquid-gas ratio little, operation energy consumption is low, and desulfurization absorbing liquid is generally alkaline solution as sodium hydroxide solution, and sodium carbonate liquor or magnesia are dissolved in the magnesium hydroxide solution that water clears up rear formation.Alkaline absorbent method desulfuration efficiency is high; System run all right is reliable; Waste water is few, produces the advantages such as secondary pollution hardly.
The principle of absorption of alkaline absorbent method is as follows: absorbing liquid is sprayed in cylindrical shell 3 by nozzle atomization, is dispersed into tiny drop and covers the whole section of cylindrical shell 3.Alkali lye in these drops contacts (flue gas flow rate keeps 3.2 ~ 4m/s) with flue gas adverse current in cylindrical shell 3, mass transfer occurs and absorbs SO 2, SO 3reaction.Circulatory pool is entered after absorbing SO2, the SO3 etc. in flue gas.Doctor solution in circulatory pool regulates after pH value through alkali lye, reenters in circulating pump, is injected in desulfurization cylindrical shell 3 as absorbing liquid.
Wet static dedusting principle is as follows: cellular interior hexagonal anode tube vertical hanging is on the fixing channel-section steel of dust remover roof, and anode tube center is the cathode line of joining with its pole.The bottom-up flowing of flue gas (flue gas flow rate 3 ~ 4m/s), cathode line is discharged under the effect of extraneous high voltage source, the materials such as the grit in the flue gas of Bottomhole pressure and water under electric field action, anode pipe move, and stick in anode tube, flue gas after purification is discharged from dust remover roof and is entered chimney, and anode tube is cleaned under the effect of interval water spray.Tubular electrostatic precipitator has that volume is little, system is simple and the advantage that efficiency of dust collection is high.
Flue gas, from the bottom access to plant of combined type wet-desulfurizing dust remover, upwards flows, and flue gas flow rate is between 3 ~ 4m/s, and the alkali lye drop that flue gas sprays with the nozzle in the middle part of device in flow process contacts, SO 2by alkali liquor absorption, flue gas obtains desulfurizing and purifying, and in this process, oarse-grained grit have also been obtained and removes.The flue-gas temperature of desulfurization is down to 50 DEG C, continue upwards to flow, airflow uniform distribution plate 15 through intermediate layer enters dedusting region, flue gas stream flowing evenly, under the effect of electric field force, the drop in flue gas and grit anode tube wall face motion, and stick on fiberglass anode tube wall, flue gas obtains further dedusting demist purification, and in this process, part SO 2have also been obtained and remove.Flue gas continues upwards flow into chimney and discharge.The intermittent shower water that top dust removal part needs is got from neutralization pond 9, to spray in backward lower Buffer Pool bottom dedusting, disengagement section access to plant thus to enter in water circulation system.
The alkali lye supplemented adds in neutralization pond 9, PH in regulating reservoir is to suitable value, enter in lower spray pipe 6 and upper spray pipe 5 through booster 8 pumping, the drop that lower spray pipe 6 sprays is mainly used in flue gas desulfurization, and the water that upper spray pipe 5 sprays is mainly used in the anode tube of rinsing dedusting area.Shower water all flows downward, and arrive in Buffer Pool 1, through being pumped in settling tank 7, supernatant liquor enters in neutralization pond 9 through pump and completes circulation, and the waste liquid of lower floor enters Waste Water Treatment.
This device and method can realize smoke desulfurization efficiency and reach more than 90%, dedusting exiting flue gas concentration≤5mg/Nm 3, discharge reaches the strictest existing discharge standard; Dust waste water recycling can be realized, greatly reduce the wastewater discharge in running; The initial cost of desulfurization and dedusting can be reduced, and the energy consumption in running can be reduced, reach the object of energy efficiency.

Claims (2)

1. a combined wet-type desulfurating dust removing device for flue gas, it is characterized in that: combined by the pipe-type electrostatic dust arrester on top and the alkaline desulfurizer of bottom, wherein device comprises cylindrical shell (3), cylindrical shell (3) is the cylinder of a setting, side, bottom has gas approach passage (2), cylindrical shell (3) bottom space of the bottom of gas approach passage (2) is Buffer Pool (1), the top of gas approach passage (2) is provided with twice lower spray pipe (6), the top of lower spray pipe (6) is provided with airflow uniform distribution plate (15), airflow uniform distribution plate (15) top is electrostatic precipitation district (4), the anode tube (13) of some cellular interior hexagonals is hung in the cylindrical shell (3) of electrostatic precipitation district (4) part, the upper space of each anode tube (13) is equipped with shower nozzle (14), some shower nozzles (14) are by pipeline and be unified into upper spray pipe (5), cylindrical shell (3) top is provided with exhanst gas outlet (7), lower spray pipe (6) is connected booster (8) outlet with upper spray pipe (5) respectively by pipeline, booster (8) import connects neutralization pond (9) bottom, neutralization pond (9) top is provided with alkali lye and adds pipeline (12), neutralization pond (9) top connects booster b (17) outlet conduit, booster b (17) inlet pipeline connects sedimentation basin (10) middle part, sedimentation basin (10) bottom has pipeline to connect waste liquid outlet (11), sedimentation basin (10) top connects booster a (16) outlet, booster a (16) inlet pipeline Connection Pool (1) bottom.
2. a combined wet-type FGD dust collection method, comprise the following steps, flue gas is by gas approach pipeline (2) access to plant, bottom of device is the Buffer Pool (1) of waste liquid after desulfurization, the water of Buffer Pool (1) enters in settling tank (10) through booster a (16) pumping, settling tank (10) supernatant liquor enters in neutralization pond (9) through booster b (17) pumping, in neutralization pond (9), add pipeline (12) by alkali lye to add alkali lye and regulate the circulation of the absorbing liquid after PH to enter in lower spray pipe (6) and upper spray pipe (5), the water of settling tank (10) bottom is expelled to sewage treatment unit, absorbing liquid is sprayed into by nozzle atomization in cylindrical shell (3) in two-layer lower spray pipe (6), be dispersed into tiny drop and cover the whole section of cylindrical shell (3), alkali lye in these drops contacts with cylindrical shell (3) interior flue gas adverse current, flue gas flow rate keeps 3.2 ~ 4m/s, mass transfer occurs and absorbs SO 2reaction, absorbing liquid is the magnesium hydroxide solution that alkaline solution of sodium hydroxide, sodium carbonate liquor or magnesia are dissolved in that water clears up rear formation, gas after desulfurization is through the backward upper flowing of airflow uniform distribution plate (15), flue gas flow rate is between 3 ~ 4m/s, enter the electrostatic precipitation district (4) on top, flow through cellular interior hexagonal anode tube (13), anode tube (13) center is the cathode line of joining with its pole, the bottom-up flowing of flue gas, flue gas flow rate 3 ~ 4m/s, cathode line is discharged under the effect of extraneous high voltage source, the upper motion of grit in the flue gas of Bottomhole pressure and water anode pipe (13) under electric field action, and stick in anode tube (13), flue gas after purification is discharged from top, cleaned under the effect of the absorbing liquid of the interval ejection of the shower nozzle (14) of anode tube (13) in upper spray pipe (5), Buffer Pool (1) bottom liquid access to plant after cleaning.
CN201510705638.XA 2015-10-27 2015-10-27 Combined desulphurization and dedusting apparatus and method for wet flue gas Pending CN105195004A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107998792A (en) * 2016-10-29 2018-05-08 佛山市原创动力科技有限公司 A kind of multistage combined desulfation dust-extraction device
CN109621613A (en) * 2019-01-11 2019-04-16 山东名邦环保科技有限公司 A kind of dry tail gas minimum discharge method of wood-based plate
CN110865142A (en) * 2019-11-20 2020-03-06 镇江海关综合技术中心 Detection method for measuring total sulfur content in food by ion chromatography
CN107754607B (en) * 2017-11-14 2021-05-14 大连海事大学 Comprehensive treatment method and device for exhaust gas of marine diesel engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107998792A (en) * 2016-10-29 2018-05-08 佛山市原创动力科技有限公司 A kind of multistage combined desulfation dust-extraction device
CN107754607B (en) * 2017-11-14 2021-05-14 大连海事大学 Comprehensive treatment method and device for exhaust gas of marine diesel engine
CN109621613A (en) * 2019-01-11 2019-04-16 山东名邦环保科技有限公司 A kind of dry tail gas minimum discharge method of wood-based plate
CN110865142A (en) * 2019-11-20 2020-03-06 镇江海关综合技术中心 Detection method for measuring total sulfur content in food by ion chromatography

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