CN204018028U - A kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume - Google Patents

A kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume Download PDF

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Publication number
CN204018028U
CN204018028U CN201420488710.9U CN201420488710U CN204018028U CN 204018028 U CN204018028 U CN 204018028U CN 201420488710 U CN201420488710 U CN 201420488710U CN 204018028 U CN204018028 U CN 204018028U
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China
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wet
several
type electric
dust leg
dust
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CN201420488710.9U
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Chinese (zh)
Inventor
柴发合
黄家玉
张凡
石应杰
邓双
刘宇
束韫
王洪昌
朱金伟
田刚
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Chinese Research Academy of Environmental Sciences
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Chinese Research Academy of Environmental Sciences
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Abstract

The utility model discloses a kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume.This device comprises bottom-up gas feed, heat exchanger tube, several humidifying nozzle, negative electrode fixed frame, several dust leg, several washer jet and the gas vent being successively set in housing, wherein, several dust leg upper/lower terminals are tightly connected with upper face plate and lower face plate respectively, the tube bank of composition control of dust; Several discharge plumes are built in respectively dust leg, are fixed by negative electrode fixed frame; Described negative electrode fixed frame is connected with the high voltage source outside housing.While purifying wet-method desulfurized fume, flue gas, by gas feed access equipment, reaches capacity or supersaturated vapor state after heat exchanger tube cooling and humidifying nozzle spray humidifying cooling; Through there is condensation vapor phase transformation in flue gas, particulate is collected into dust leg inner surface under electric field force effect in dust leg.The utility model catchments vapour condensation phase change and wet-esp in one, can reach the deep purifying effect of wet-method desulfurized fume.

Description

A kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume
Technical field
The utility model relates to a kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume, belongs to air pollution control technique field.
Background technology
At present, coal burning flue gas desulfurization mainly adopts Wet Flue Gas Desulfurization Technique.In service at wet desulfurization system, unavoidably produce SO 3acid mist, slurry drops aerosol, or the PM such as ammonia salt aerosol 2.5, health and environment are caused to serious harm; The anticorrosion cost of follow-up equipment improves thereupon.
Early stage wet desulfurization system is all equipped with flue gas heat-exchange unit (GGH) as in limestone-gypsum method process system, to add clean flue gas after thermally desulfurizing, improves atmosphere hoist height, is conducive to flue gas diffusion, has effectively avoided " gypsum rain " phenomenon.But in actual moving process, GGH easily produces obstruction, etching problem, has a strong impact on the safe operation of system.At present, exceed 70% WFGD system and cancel GGH.But cancel after GGH, around chimney, produce significantly " gypsum rain ", surrounding enviroment are produced to severe contamination.
A PM of coal-burning power plant's discharge 2.5superfine particulate matter is divided into the PM that directly solid-state (or liquid) form is discharged 2.5superfine particulate matter, and discharging with gaseous state or vapor form under flue-gas temperature state condenses into the condensation type PM of solid-state (or liquid) in the dilution of plume and cooling procedure 2.5superfine particulate matter.These condensation type particles are (as SO 3acid mist, HCl, NH 3, steam) be the precursor of gray haze mostly, the impact of power plant's surrounding enviroment be can not ignore.
At present, traditional wet electrical dust precipitator technology can effectively trap fine particle (PM 2.5dust, SO 3acid mist, aerosol), heavy metal (Hg, As, Se, Pb, Cr); To PM 2.5the arresting efficiency of particle is more than 98%, and soot emissions can reach 10mg/m 3even 5mg/m 3below; Can effectively solve the landscape pollution problem such as pipe-line equipment corrosion and " gypsum rain " that wet desulfurization system brings.But (m) the endocorpuscular arresting efficiency of particle size range is lower for≤1 μ, limited in one's ability to the removal of condensation type particle (gray haze precursor) to sub-micron for traditional wet electric cleaner.Therefore, be further deep purifying wet-method desulfurized fume, need to strengthen the removal capacity of wet electrical dust precipitator to superfine particulate matter and condensation type particle.
Utility model content
The purpose of this utility model is to provide a kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume, and this device catchments vapour condensation phase change and wet-esp in one, and compact conformation can reach the deep purifying effect of coal-burning boiler wet-method desulfurized fume.
For achieving the above object, the utility model is by the following technical solutions:
A kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume, this device comprises bottom-up gas feed, heat exchanger tube, several humidifying nozzle, negative electrode fixed frame, several dust leg, several washer jet and the gas vent being successively set in housing, wherein, several dust leg upper/lower terminals are tightly connected with upper face plate and lower face plate respectively, the tube bank of composition control of dust; Several discharge plumes are built in respectively dust leg, are fixed by negative electrode fixed frame; Described negative electrode fixed frame is connected with the high voltage source outside housing.
In purifier of the present utility model, described heat exchanger tube can be common pipe, and in order to increase the external surface area of heat exchanger tube, improves heat exchange efficiency, also can select finned tube; Further, for optimization airflow distributes, described heat exchanger tube is stratiform setting in housing.In heat exchanger tube using air or water as heat catalysis.
Preferably, described dust leg material is stainless steel or electroconductive frp, and its cross section is circle or regular polygon.
Preferably, the internal diameter of described circular cross section or the inscribed circle diameter of regular polygon are 200mm~800mm.
Preferably, in order to increase the external surface area of dust leg, improve heat exchange efficiency, the outer wall of described dust leg is provided with fin.
Preferably, the control of dust tube bank of described several dust legs composition is for single-stage or be made up of plural serial stage, between dust leg outer wall using air or water as heat catalysis.
Preferably, described humidifying nozzle adopts the mode of operation of spray continuously, and described washer jet adopts the mode of operation of intermittent shower.
Preferably, described hull outside is provided with liquid circulation pump, and this liquid circulation pump is connected to humidifying nozzle and washer jet by liquid line, and the liquid that takes this housing bottom is received is recycled.
Adopt the utility model to purify the process of wet-method desulfurized fume to be: the flue gas after coal-burning boiler wet desulphurization by air inlet access to plant after, through heat exchanger tube heat exchange cooling, approach saturation vapour state; After humidifying nozzle further sprays humidification, cooling, reach capacity or supersaturated vapor state; When flue gas passes through dust leg, between dust leg outer wall, cool as heat catalysis using air or water, the phase transformation of flue gas generation condensation vapor, most condensation type particles are (as SO 3acid mist, HCl, NH 3, steam) form liquid-state soluble (or solid-state) particulate; In phase transition process, supersaturated vapor is with PM 2.5condense for the nuclei of condensation undergo phase transition, make PM 2.5particle diameter increases, mass penalty; In condensation phase change, these particulates are collected into dust leg inner surface under electric field force effect, and flue gas reaches the effect of deep purifying.
The beneficial effects of the utility model are:
1) the utility model makes full use of the synergy of condensation vapor phase transformation and high voltage electric field, effectively strengthen wet-esp to superfine particulate matter and condensation type particle (as SO 3acid mist, HCl, NH 3, steam) deep purifying performance.By condensation vapor phase transformation, most condensation type particles are (as SO 3acid mist, HCl, NH 3, steam) form liquid-state soluble (or solid-state) particulate; PM 2.5especially the particle diameter of submicron particles increases, and charged ability strengthens, and under the effect of electric field force, arresting efficiency improves.
2) after wet desulphurization, exit gas temperature is conventionally at 45 DEG C~60 DEG C, and water capacity is up to 90%~95%, makes the flue gas state that reaches capacity, and cooling 1~2 DEG C of flue gas can reach.By heat exchanger tube heat exchange, humidifying nozzle humidification, cooling, dust leg bundle indirect heat exchange, can realize the hypersaturated state of flue gas.
3) heat exchanger tube adopts after layered arrangement, can play the effect that optimization airflow distributes; The humidifying nozzle adopting sprays continuously, can play the effect of cleaning heat exchange pipe external surface, prevents dust stratification, fouling, is conducive to keep the stable of heat exchange property.
4) compared with traditional wet electrostatic precipitation technology, the utility model catchments vapour condensation phase change and wet-esp in one, and compact conformation can reach the deep purifying effect of coal-burning boiler wet-method desulfurized fume.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model high-efficient wet-type electric precipitation purifier;
Fig. 2 is the structural representation of circular control of dust tube bank;
Fig. 3 is the structural representation of square control of dust tube bank;
Fig. 4 is the structural representation of regular hexagon control of dust tube bank;
Fig. 5 is the structural representation of circular control of dust tube bank plural serial stage;
Fig. 6 is the structural representation of heat exchanger tube combination.
Reference numeral: 1, gas feed, 2, heat exchanger tube, 3, humidifying nozzle, 4, negative electrode fixed frame, 5, dust leg, 6, discharge plume, 7, insulated case, 8, gas vent, 9, washer jet, 10, high voltage source, 11, upper face plate, 12, valve, 13, lower face plate, 14, liquid circulation pump
Detailed description of the invention
As shown in Figure 1, the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume of the present utility model comprises bottom-up gas feed 1, heat exchanger tube 2, several humidifying nozzle 3, negative electrode fixed frame 4, several dust leg 5, several washer jet 9, insulated case 7 and the gas vent 8 being successively set in housing, wherein, in conjunction with as shown in Figure 2,3, 4, several dust leg 5 upper/lower terminals are tightly connected with upper face plate 11 and lower face plate 13 respectively, the tube bank of composition control of dust; Several discharge plumes 6 are built in respectively dust leg 5, fixing by negative electrode fixed frame 4; Negative electrode fixed frame 4 is connected with the high voltage source 10 outside housing.
After flue gas access to plant, first will lower the temperature through heat exchanger tube 2, heat exchanger tube 2 can be common pipe, and in order to increase the external surface area of heat exchanger tube, improves heat exchange efficiency, also can select finned tube, as shown in Figure 6.Further, for optimization airflow distributes, described heat exchanger tube is stratiform setting in housing.In heat exchanger tube using air or water as heat catalysis.
Flue gas after heat exchanger tube 2 coolings approaches saturation vapour state, after humidifying nozzle 3 further sprays humidification, cooling, reaches capacity or supersaturated vapor state, and humidifying nozzle 3 adopts the mode of operation of spray continuously.Saturated or supersaturated vapor state flue gas enters dust leg 5, and condensation vapor phase transformation occurs, and most condensation type particles are (as SO 3acid mist, HCl, NH 3, steam) form liquid-state soluble (or solid-state) particulate; In phase transition process, supersaturated vapor is with PM 2.5condense for the nuclei of condensation undergo phase transition, make PM 2.5particle diameter increases, mass penalty; In condensation phase change, these particulates are collected into dust leg 5 inner surfaces under electric field force effect, and flue gas reaches the effect of deep purifying.
The material of dust leg 5 is stainless steel or electroconductive frp, and its cross section is circular (as shown in Figure 2) or regular polygon, as square (as shown in Figure 3), regular hexagon (as shown in Figure 4).Wherein, the internal diameter of circular cross section or the inscribed circle diameter of regular polygon are that 200mm~800mm is advisable.In order to increase the external surface area of dust leg, improve heat exchange efficiency, the outer wall of described dust leg is provided with fin.The control of dust tube bank that several dust legs 5 form can be single-stage, also can be made up of plural serial stage, as shown in Figure 5.Heat catalysis between dust leg outer wall can be air or water.
After flue gas passes through dust leg 5, PM 2.5the superfine particulate matters such as particulate are collected in dust leg 5 inner surfaces, and the moisture film that wherein part particle forms by dust leg 5 inner surfaces is washed in the ash bucket of device bottom, and remainder can adopt the mode of operation periodic cleaning of intermittent shower to remove by washer jet 9.
Liquid from humidifying nozzle and washer jet ejection is collected in housing bottom, is provided with liquid circulation pump and be arranged on hull outside, liquid-circulating to humidifying nozzle and washer jet can be recycled.
Utilize said apparatus to purify the method for wet-method desulfurized fume as follows:
1) coal-burning boiler wet-method desulfurized fume by gas feed 1 access to plant after, after heat exchanger tube 2 heat exchange coolings, approach saturation vapour state; After humidifying nozzle 3 further sprays humidification, cooling, reach capacity or supersaturated vapor state; When flue gas passes through dust leg 5, the heat catalysis through between dust leg 5 outer walls cools, and condensation vapor phase transformation occurs, and most condensation type particles are (as SO 3acid mist, HCl, NH 3, steam) form liquid-state soluble (or solid-state) particulate; In phase transition process, supersaturated vapor is with PM 2.5condense for the nuclei of condensation undergo phase transition, make PM 2.5particle diameter increases, mass penalty; In condensation phase change, these particulates are collected into dust leg 5 inner surfaces under electric field force effect, and flue gas reaches the effect of deep purifying.In this process, control the interior flue gas flow rate of dust leg 5 at 0.5~3m/s, the time of staying is at 2~12s.
2) PM that dust leg 5 inwalls are collected 2.5particulate, the moisture film forming by dust leg 5 inner surfaces except part is washed in the ash bucket of device bottom, and remainder is removed by washer jet 9 periodic cleanings.
Adopt said apparatus to purify wet-method desulfurized fume, PM 2.5concentration of emission is lower than 5mg/Nm 3, SO 3aerosol concentration is lower than 3mg/Nm 3.

Claims (9)

1. the high-efficient wet-type electric precipitation purifier of a wet-method desulfurized fume, it is characterized in that, this device comprises bottom-up gas feed, heat exchanger tube, several humidifying nozzle, negative electrode fixed frame, several dust leg, several washer jet and the gas vent being successively set in housing, wherein, several dust leg upper/lower terminals are tightly connected with upper face plate and lower face plate respectively, the tube bank of composition control of dust; Several discharge plumes are built in respectively dust leg, are fixed by negative electrode fixed frame; Described negative electrode fixed frame is connected with the high voltage source outside housing.
2. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 1, is characterized in that, described heat exchanger tube is common pipe or finned tube, is stratiform setting in housing.
3. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 1 and 2, is characterized in that, in described heat exchanger tube using air or water as heat catalysis.
4. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 1, is characterized in that, described dust leg material is stainless steel or electroconductive frp, and its cross section is circle or regular polygon.
5. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 4, is characterized in that, the internal diameter of described circular cross section or the inscribed circle diameter of regular polygon are 200mm~800mm.
6. according to the high-efficient wet-type electric precipitation purifier of the wet-method desulfurized fume described in claim 4 or 5, it is characterized in that, the outer wall of described dust leg is provided with fin.
7. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 1, is characterized in that, the control of dust tube bank of described several dust legs composition is for single-stage or be made up of plural serial stage, between dust leg outer wall using air or water as heat catalysis.
8. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 1, is characterized in that, described humidifying nozzle adopts the mode of operation of spray continuously, and described washer jet adopts the mode of operation of intermittent shower.
9. the high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume according to claim 1, is characterized in that, described hull outside is provided with liquid circulation pump, and this liquid circulation pump is connected to humidifying nozzle and washer jet by liquid line.
CN201420488710.9U 2014-08-27 2014-08-27 A kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume Expired - Fee Related CN204018028U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104226479A (en) * 2014-08-27 2014-12-24 中国环境科学研究院 Efficient wet type electric dedusting and purifying device and method for smoke obtained after wet desulphurization
CN108079714A (en) * 2017-12-06 2018-05-29 宁波市江北义盈工贸有限公司 A kind of boiler dust-extraction unit
CN110624340A (en) * 2019-09-18 2019-12-31 东南大学 Dust removal pretreatment device and method based on water vapor charge phase change

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104226479A (en) * 2014-08-27 2014-12-24 中国环境科学研究院 Efficient wet type electric dedusting and purifying device and method for smoke obtained after wet desulphurization
CN108079714A (en) * 2017-12-06 2018-05-29 宁波市江北义盈工贸有限公司 A kind of boiler dust-extraction unit
CN110624340A (en) * 2019-09-18 2019-12-31 东南大学 Dust removal pretreatment device and method based on water vapor charge phase change

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