CN203342941U - Device for wetly electro-coagulating and capturing tiny particles - Google Patents

Abstract

The utility model relates to a device for wetly electro-coagulating and capturing tiny particles. Flue gas of a coal-fired boiler is electro-coagulated and processed through an alternating electric field, the tiny particles such as PM2.5 in the flue gas are coagulated into large particles, positively and negatively charged ions are ionized by a strong electric field through a wet type electrostatic dust collection device for adsorbing and removing PM2.5, and meanwhile, PM2.5 on polar plates is flushed through a spraying system, so that the removal rate of PM2.5 in the flue gas can be remarkably increased. Through the device, the tiny particles such as PM2.5 in the coal-fired flue gas can be efficiently removed; compared with the prior art, the device has the characteristics of high efficiency and low energy consumption.

Description

A kind of wet type coagulation also catches the device of fine particulates

Technical field

A kind of wet type coagulation of the present invention also catches the device of fine particulates, relates to environmental technology field, and particularly the Air Pollutant Emission control field of thermal power plant, industry coal-boiler, be applied to the comprehensive regulation of haze weather.

Background technology

At present, owing to containing the fine particles such as a large amount of inhalable particles (PM2.5), organic carbon hydrogen compound in China's air, these particulates swim in atmosphere for a long time, cause the haze weather of continuation, the serious threat health, and become an environment protection treating difficult problem." ambient air quality " that China revises recently usingd clearly fine particle polluted as the monitoring and evaluation object.Therefore, fine particle will become the main task of several years Air Pollution Control from now on, and its technical research and application will become one of most important work of atmosphere field of Environment Protection.

The domestic improvement for PM2.5 in coal-fired flue-gas, rely on the equipment such as electrostatic precipitator, sack cleaner or electric-bag complex dust collector mostly.In electrostatic precipitation, by the strong electric field ionization effect, bulky grain adheres to free electron and removes after charged, but, because PM2.5 is in charged and diffusional charging mixed zone on the scene, charged poor ability, be difficult to remove; Bag-type dusting has removal effect preferably to fine particle, but the bag-type dusting deashing is frequent, reduces the service life of filter bag, and has increased the management difficulty of stable operation; The subject matter that electric-bag complex dust collector exists in the time of solving preferably independent use electric cleaner or sack cleaner.But existing electric-bag complex dust collector is still not high enough to the removal efficiency of fine particle, be difficult to meet the efficient technical need of controlling, as need be, for fine particle, needed the coated filter material that adopts price high.

Summary of the invention

Purpose of the present invention is exactly the device that provides in order to overcome the defect that above-mentioned prior art exists the wet type coagulation that a kind of efficiency is high, cost is low and catch fine particulates, can realize the purpose to the synchronous removal of the fine particles such as PM2.5 in coal-fired flue-gas.

Purpose of the present invention can be achieved through the following technical solutions: a kind of wet type coagulation also catches the device of fine particulates, comprises that alternating electric field, wet static dedusting device, spray equipment form.It is characterized in that, whole device is by the import flue gas is added to alternating electric field, and fine particle is agglomerated into the bulky grain thing and follows flue gas to enter wet static dedusting device, by spray equipment, flue gas is washed away.Described alternating electric field is comprised of alternating electric field electricity coalescer, alternating electric field power supply, and the voltage range of high voltage source is between 20-100kV, and frequency is between 5-10Hz.Described wet static dedusting device mainly is comprised of corona wire, receiving electrode, insulated case and power supply.Described spray equipment mainly contains absorption liquid sprayer, demister, insulation jet pipe composition.

Utilize the alternating electric field coagulation and and the technology of wet static dedusting, compared with prior art, the present invention has following advantages: the present invention adopts external electrical field to carry out coagulation also to the import flue gas, does not change the physical dimension that has flue gas ash removal now; It is coalescent that coagulation technology can be carried out the PM2.5 fine grained in flue gas coalescence well, forms the bulky grain thing, more easily by cleaner, removed; Wet static dedusting device can directly apply in wet desulphurization equipment, does not change the physical dimension of wet desulphurization; Under the ionization of electrostatic field, particle can fully ionize, and is adsorbed in the both sides pole plate, and capturing efficiency is high; Sprinkling equipment adopts alkaline absorption solution, can directly wash away the particle that pole plate goes out to adhere to, and prevents that the secondary of particle from escaping; Can be combined with existing Wet Flue Gas Desulfurization Technique, remove the pollutants such as sulfur dioxide in flue gas, nitrogen oxide; The absorption liquid of sprinkling equipment, after the demister trapping, can recycle, and operating cost is low.

The accompanying drawing explanation

Fig. 1 is wet type coagulation the device schematic diagram that catches fine particulates.In figure 1, reaction tower, 2, alternating electric field electricity coalescer, 3, the alternating electric field power supply, 4, absorption liquid sprayer, 5, demister, 6, power line, 7, the electrostatic field high voltage source, 8, absorption liquid valve, 9, absorption liquid pipeline, 10, slush pump, 11, absorption liquid dosing pond, 12, regeneration of absorption solution pond, 13, the dope crystallizing pond.

The specific embodiment

As shown in Figure 1, at first start coagulation AC field power supply (3) and electrostatic field power supply (7), fine particle in electric coalescer (2) along with alternating electric field repeatedly collision coalescence become bulky grain, along with flue gas enters reaction tower (1), due to electrostatic interaction, particle is adsorbed on the pole plate of both sides, the absorbent prepared is placed in absorption liquid dosing pond (11), utilize slush pump (10) to be delivered to reaction tower (1) by absorption liquid pipeline (9), spray in reaction tower (1) with vaporific form by absorption liquid sprayer (4).The absorption liquid of bottom, absorption tower is processed through regeneration of absorption solution pond (12), and supernatant flows into absorption liquid dosing pond (11), can recycle.

Utilize the laboratory pilot-plant, structure as shown in Figure 1.The desulfurizing tower diameter is 250mm, tower height 3000mm, and static electric field supply voltage 0-80kV, absorption liquid is 1-10L/m with the exhaust gas volumn ratio ³(adjustable continuously).Utilize the adsorption liquid that the polyfluortetraethylene pipe of diameter 10mm sprays spray gun to spray in desulfurizing tower.

The processing coal-fired flue-gas is 200m ³/ h, temperature 50 C, initial dust content is 1000mg/m ³.Utilize Electrical low pressure impactor (ELPI) to be analyzed total dust content and fine particle concentration in flue gas.When not enabling wet type coagulation dust arrester, by monitoring, find that the dedusting dust concentration drops to 210mg/m ³, wherein fine particle is about 70mg/m ³.Result shows, the efficiency of dust collection of spraying wet desulfurization system is about 80%, but the concentration of emission of fine particle is still higher.When starting wet type coagulation dust arrester, by voltage-regulation, to 50kV, through monitoring, the dust concentration after dedusting drops to 65mg/m ³, and fine particle concentration also is down to 12mg/m ³.Visible, the removal efficiency of system to fine particles such as PM2.5 of having utilized wet type coagulation dust arrester to improve.

Claims (4)

1. a wet type coagulation catch the device of fine particulates, comprise that alternating electric field, wet static dedusting device, spray equipment form, it is characterized in that, whole device is by adding alternating electric field to the import flue gas, fine particle is agglomerated into the bulky grain thing and follows flue gas to enter wet static dedusting device, by spray equipment, flue gas is washed away.

2. a kind of wet type coagulation according to claim 1 catch the device of fine particulates, it is characterized in that, described alternating electric field is comprised of alternating electric field electricity coalescer, alternating electric field power supply, and the voltage range of high voltage source is between 20-100kV, and frequency is between 5-10Hz.

3. according to a kind of wet type coagulation claimed in claim 1 and catch the device of fine particulates, it is characterized in that, described wet static dedusting device mainly is comprised of corona wire, receiving electrode, insulated case and power supply.

4. a kind of wet type coagulation according to claim 1 catch the device of fine particulates, is characterized in that, described spray equipment mainly is comprised of absorption liquid sprayer, demister, insulation jet pipe.

Images