CN102921254B - Preparation method of high-efficiency dedusting module - Google Patents

Abstract

The invention discloses a method for preparing a high-efficiency dust removal module, belonging to the technical fields of material preparation and environmental protection. The method is to use the honeycomb porous ceramics as the base material, fill the twisted wire brushes in the pores, and use the dust-binding agent solution to surface treat the hole walls of the honeycomb porous ceramics and the twisted wire brushes to obtain A high-efficiency dust removal module with small air resistance and large flux. When the dust-laden airflow flows in the module, it will turbulently pass through the complex flow path formed by the bristles and ceramic holes, and the particles in it will be captured by the dust-binding agent layer on the surface of the bristles and the inner surface of the ceramic holes, so this module is very conducive to removal Fine particles with a particle size ≤ 2 μm in the airflow.

Description

A kind of preparation method of high-efficiency dedusting module

technical field

The invention relates to a preparation method of a high-efficiency dust removal module, belonging to the technical fields of material preparation and environmental protection.

Background technique

With the rapid development of my country's economy, the haze air pollution in large and medium-sized cities, economically developed areas and areas with intensive basic industries in my country is becoming more and more serious. As my country's restrictions on SOx and NOx emissions become increasingly stringent, and related environmental protection technologies and devices continue to be put into use, the total emissions of SOx and NOx pollutants in my country's atmospheric environment have decreased year by year. However, from the current monitoring results, my country's Yangtze River Delta On the contrary, the smog pollution in the Pearl River Delta and Beijing-Tianjin-Hebei areas is becoming more and more serious, which has seriously threatened the health of the people and the sustainable development of the economy.

With the current in-depth research on haze pollution traceability, it has been found that ultrafine particles emitted by industrial production have a certain contribution to haze weather, especially in Shandong, Hebei and other places, where there are a large number of emissions from cement plants and sintering plants. Dusty gas contributes significantly to the haze phenomenon in the surrounding environment. Therefore urgently need a kind of efficient dedusting module to solve this problem.

At present, there are many mature technologies in the field of industrial dust removal, such as: bag type dust removal, electric dust removal, mechanical dust removal and wet dust removal, etc. Among them, the dust removal efficiency of the bag type dust collector is very high, and it has good tolerance to the fluctuation of the particle size range of the dust. Even fine dust can successfully obtain a high retention rate. However, the pressure drop of the bag type dust collector is relatively large. The dynamic load requirements of such gas transmission equipment are high. In addition, the common cloth bags are difficult to withstand high temperature. For the sintering flue gas containing red hot particles and smoldering particles in the waste gas, "burning bag" accidents often occur when using cloth bag dust removal. In addition, in the common industrial waste gas treatment section, the pressure of the waste gas is very low. For the bag type dust collector with a large pressure drop, it is often necessary to increase the pressure head of the fan to cope with the pressure drop of the bag, and even need to purchase a new fan.

Electrostatic precipitator is also a very common and efficient dust removal method at present. This method is a dust removal method that first charges the dust in the air, and then removes it from the air through electric field force and fixes it on the surface of the electrode plate. This method can be used for high-temperature waste gas treatment, and has only a small pressure drop resistance, but its disadvantage is that there are certain requirements on the conductivity of the dust and the humidity of the gas, otherwise a high dust removal rate cannot be obtained. In addition, the one-time investment of this method is relatively high. High and low operating costs.

Mechanical dedusting is a method of dust removal using mechanical devices such as dust chambers and cyclone separators. This method has a good effect on dust with large particles. However, the purification efficiency is very low for particles of about 2 μm that cause haze pollution. Moreover, for fine particles, this type of dust removal device has a serious secondary dust problem, and cannot effectively play a role in the current situation where the requirements for dust removal efficiency of fine particles are getting higher and higher.

Wet dust removal is a method of dust removal using spray towers, water film dust collectors or Venturi dust collectors. It is commonly used in the treatment of gases with large dust particle sizes. The trapped particles can be discharged by forming mud with water. This process The requirements for equipment are also higher, the equipment is larger in size, and the investment is higher.

To sum up, at present, my country urgently needs an efficient and flexible removal device with small air resistance, large flux, and fine particles and droplets, which is very important for suppressing the contribution of industrial dust to haze from the source .

Contents of the invention

The purpose of the present invention is to obtain a high-efficiency dust removal module with low air resistance and high flux through a simple method. The module has a compact structure, a simple manufacturing method, and a wide operating temperature range, and has good capture performance for soot, soil dust, and secondary aerosol particles.

The purpose of the present invention is achieved through the following technical solutions: using honeycomb porous ceramics as the substrate, twisted wire brushes are filled in the pores of the honeycomb porous ceramics, and the dust-binding agent solution is used to treat the pore walls of the honeycomb porous ceramics. The bristle surface of the twisted wire brush is impregnated, the concentration of the impregnating solution is 2%~100% of the saturation concentration of the dust-binding agent, and then dried to obtain a high-efficiency dust removal module with low air resistance and high gas flux. The outer diameter of the brush is between the long diameter and short diameter of the honeycomb porous ceramic channel section. The honeycomb porous ceramics used are cordierite ceramics, alumina ceramics, silica ceramics or silicon carbide ceramics, and the pore diameter is 1mm~ 50mm; the dust-binding agent in the method is selected from polyacrylic acid, polyacrylamide, acrylic acid-acrylamide copolymer, polyaspartic acid, gelatinized starch, cationic etherified starch, sodium carboxymethylcellulose, methyl One or a mixture of any of cellulose, polyethylene glycol and polyvinyl alcohol; the bristles of the twisted wire brush in the described method are selected from steel wire, stainless steel wire, iron wire, copper-plated steel wire, copper-plated iron wire, Zinc steel wire, galvanized iron wire, copper wire, glass fiber, carbon fiber, nylon wire, polypropylene wool, polyethylene wool, PVC wool, tree palm, horsetail, wool, mane.

Compared with common dust removal devices, the size of the dust removal module obtained by the method is adjustable, and the removal effect on fine particles is good. Since micropores or slits are avoided to trap particles, the module has the characteristics of small pressure drop and large air volume. For the treatment of high-temperature dusty gas, steel wire, stainless steel wire, iron wire, copper-plated steel wire, copper-plated iron wire, galvanized steel wire, galvanized iron wire, copper wire, glass fiber, carbon fiber and other materials can be selected as the bristle material of the twisted wire brush. Good thermal stability; for normal temperature or medium temperature flue gas, you can choose nylon filament, polypropylene wool, polyethylene wool, polyvinyl chloride wool, tree palm, horsetail, wool, mane and other materials as the bristle material of the twisted wire brush. The dust-binding agent used in the technical solution will form a viscous liquid film within a certain temperature range and stay on the inner wall of the bristles and porous ceramic channels. When fine particles in the air collide with the wall and the bristles, they will be trapped by the liquid film of the dust-binding agent Capture, no escape and secondary dust will occur in the subsequent air scour; when the dust removal module is saturated, water can be used to remove the fine particles deposited on the cilia of the twisted wire brush and the inner wall of the honeycomb porous ceramics together with the dust binding agent and eluting, and then re-load the dust-binding agent to complete the regeneration of the module.

Description of drawings

The accompanying drawings 1 and 2 of the description illustrate the technical solution intuitively. In Fig. 1 and Fig. 2: 1 represents honeycomb porous ceramics; 2 represents twisted wire brush. Fig. 1 is an oblique view of honeycomb porous ceramics, and draws the process of inserting twisted wire brushes into ceramic holes, and Fig. 2 is a front view after each ceramic hole is inserted into twisted wire brushes. Fig. 1 and Fig. 2 do not constitute restriction to the external shape and the channel shape of honeycomb porous ceramic carrier in this technical scheme, the external shape of honeycomb porous ceramic in this technical scheme is except square, can also choose round, ellipse, pear according to actual needs. Shape, triangle and polygon, and besides the square hole, the hole can also choose round hole, oval hole, semicircle hole and rectangular hole.

Detailed ways

The preparation method of a high-efficiency dedusting module provided by the present invention, its specific technical scheme is realized as follows: use honeycomb porous ceramics as the matrix, fill the twisted wire brushes in the pores of the honeycomb porous ceramics, and use the dust-binding agent The solution is used to impregnate the pore wall of the honeycomb porous ceramics and the bristle surface of the twisted wire brush. The concentration of the impregnation solution is 2% to 100% of the saturation concentration of the dust-binding agent, and then dried to obtain a low air resistance and high gas permeability. A large amount of high-efficiency dust removal module, the honeycomb porous ceramics used are cordierite ceramics, alumina ceramics, silicon dioxide ceramics or silicon carbide ceramics, and its aperture is 1mm~50mm; the dust-binding agent in the method is selected from polyacrylic acid , polyacrylamide, acrylic acid-acrylamide copolymer, polyaspartic acid, gelatinized starch, cationic etherified starch, sodium carboxymethylcellulose, methylcellulose, polyethylene glycol and polyvinyl alcohol Or any mixture of several; The bristles of the twisted wire brush in the described method are selected from steel wire, stainless steel wire, iron wire, copper-plated steel wire, copper-plated iron wire, galvanized steel wire, galvanized iron wire, copper wire, glass fiber, carbon fiber, Nylon yarn, polypropylene wool, polyethylene wool, PVC wool, tree palm, ponytail, wool, mane.

List several specific examples below, to further understand the present invention:

Example 1:

Take a honeycomb cordierite porous ceramic with a size of 10cm×10cm, the hole size is 1.5mm×1.5mm, and the number of holes is 38×38, take 1444 twisted wire brushes, the outer diameter is 2.1mm, and the bristle material is polyester Vinyl filaments are inserted into the channels of cordierite honeycomb ceramics, a brush is inserted in each hole, the module is impregnated with gelatinized starch solution (mass concentration 1%), and then taken out and dried to obtain a gas purification module that can efficiently bind dust. When the radial length is 20cm, the pressure drop is less than 900Pa at a space velocity of 10000/h, and the interception efficiency for particles with a particle size of 2μm exceeds 90%.

Example 2:

Take a honeycomb aluminum oxide porous ceramic with a size of 20cm×20cm, its hole size is 1.5mm×1.5mm, and the number of holes is 76×76, take 5776 twisted wire brushes, its outer diameter is 1.5mm, and the bristle material is polyester Acrylic filaments are inserted into the channels of the alumina honeycomb ceramics, a brush is inserted in each hole, the module is impregnated with a polyacrylamide solution with a molecular weight of 2 million (mass concentration 1.5%), and then taken out and dried to obtain a dust-binding When the gas purification module has a radial length of 30cm, the pressure drop is less than 900Pa at a space velocity of 10,000/h, and the interception efficiency for particles with a particle size of 2μm exceeds 93%.

Example 3:

Take a cylindrical honeycomb silicon dioxide porous ceramic with a diameter of 10 cm, and its pore diameter is 2 mm. Take a twisted wire brush with an outer diameter of 2 mm. Insert a brush, impregnate the module with an acrylic acid-acrylamide copolymer solution with a molecular weight of 1 million (mass concentration 1.2%), then take it out and dry it to obtain a gas purification module that can efficiently bind dust. When its radial length is 40cm , at a space velocity of 10000/h, the pressure drop is less than 1000Pa, and the retention efficiency of particles with a particle size of 2 μm exceeds 98%.

Example 4:

Take a honeycomb aluminum oxide porous ceramic with a size of 10cm×10cm, its hole size is 1mm×1mm, and the number of holes is 50×50, take 2500 twisted wire brushes, its outer diameter is 1.4mm, and the bristle material is tree palm, Insert it into the channels of the alumina honeycomb ceramics, insert a brush in each hole, impregnate the module with a cationic etherified starch solution with a mass concentration of 2%, and then take it out and dry it to obtain a gas purification module that can efficiently bind dust. When the longitudinal length is 25cm, the pressure drop is less than 700Pa at a space velocity of 7000/h, and the retention efficiency of particles with a particle size of 2μm exceeds 96%.

Example 5:

Take a cylindrical honeycomb silicon carbide porous ceramic with a diameter of 50cm, and its pore diameter is 50mm. Take a twisted wire brush with an outer diameter of 50mm. Brush, impregnate the module with a polyethylene glycol solution with a molecular weight of 10000 (mass concentration 0.7%), then take it out and dry it to obtain a gas purification module that can efficiently bind dust. When its radial length is 100cm, the At space velocity, the pressure drop is less than 900Pa, and the interception efficiency for particles with a particle size of 2 μm exceeds 97%.

Embodiment 6:

Take a honeycomb cordierite porous ceramic with a size of 10cm×10cm, the hole size is 2mm×2mm, take a twisted wire brush with an outer diameter of 2.5mm, and the bristle material is copper wire, insert it into the channel of the cordierite honeycomb ceramic, Insert a brush into each hole, impregnate the module with a solution of polyvinyl alcohol (molecular weight: 100,000) with a mass concentration of 0.6%, and then take it out and dry it to obtain a gas purification module that can efficiently bind dust. When its radial length is 20cm, At a space velocity of 7000/h, the pressure drop is less than 700Pa, and the interception efficiency exceeds 95% for particles with a particle size of 2 μm.

Embodiment 7:

Take a honeycomb cordierite porous ceramic with a size of 10cm×10cm, the hole size is 3mm×3mm, take a twisted wire brush with an outer diameter of 3mm, and the bristle material is glass fiber, insert it into the channel of the cordierite honeycomb ceramic, each hole Insert a brush, impregnate the module with a 1% methyl cellulose solution, then take it out and dry it to obtain a gas purification module that can efficiently bind dust. At high speed, the pressure drop is less than 700Pa, and the interception efficiency for particles with a particle size of 2 μm exceeds 90%.

Claims (3)

1. A method for preparing a high-efficiency dedusting module, characterized in that the method is realized through the following technical scheme: using honeycomb porous ceramics as a substrate, twisting wire brushes are filled in the channels of honeycomb porous ceramics, and using The dust-binding agent solution impregnates the hole wall of the honeycomb porous ceramics and the bristle surface of the twisted wire brush. The concentration of the impregnation solution is 2% to 100% of the saturation concentration of the dust-binding agent, and then dried to obtain a low air resistance and High gas flux dust removal module, the outer diameter of the twisted wire brush is between the long diameter and short diameter of the honeycomb porous ceramic channel section, and the honeycomb porous ceramics used are cordierite ceramics, alumina ceramics, silicon dioxide Ceramic or silicon carbide ceramics, the pore diameter is 1mm~50mm. 2. The preparation method of a high-efficiency dust removal module as claimed in claim 1, characterized in that: the dust-binding agent in the method is selected from polyacrylic acid with a molecular weight between 20 million and 20,000, and a molecular weight between 1 million and 25 million. Inter-polyacrylamide, acrylic acid-acrylamide copolymer with a molecular weight between 200,000 and 10 million, polyaspartic acid with a molecular weight between 3 million and 20,000, gelatinized starch, cationic etherified starch, carboxymethyl Sodium cellulose, methyl cellulose, polyethylene glycol with a molecular weight between 1000 and 25,000, and polyvinyl alcohol with a molecular weight between 25,000 and 300,000, or a mixture of any of them. 3. The preparation method of a kind of high-efficiency dust removal module as claimed in claim 1, is characterized in that: the bristle of the twisted wire brush in the method is selected from steel wire, stainless steel wire, iron wire, copper-plated steel wire, copper-plated iron wire, galvanized Steel wire, galvanized iron wire, copper wire, glass fiber, carbon fiber, nylon wire, polypropylene wool, polyethylene wool, PVC wool, tree palm, horsetail, wool, mane.