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    Treatment of glass and ceramic waste gastreatment-of-glass-and-ceramic-waste-gas

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    Treatment of glass and ceramic waste gas

    来源:admin(传梦环保整理发布)   时间:2018-08-28

    Treatment of glass and ceramic waste gas:
    1. dust removal in billet preparation process
    (1) Hydraulic dust removal is a method of collecting dust produced by breaking hard materials by spraying water from a sprinkler during the preparation of billets. On the one hand, it reduces the dispersion of dust when the material is crushed, and dust can be collected and emitted into the air by spraying. On the other hand, the purity of the raw material is improved by washing with water, which is beneficial to the quality of the product.
    (2) mechanical dust removal
    (1) The dedusting system of jaw crusher The dedusting system of jaw crusher can adopt swirl tray tower www.xuanliubanta.com or cyclone deduster or rotary reverse blow flat bag deduster. Cyclone dust collector equipment investment is less, the design and installation of the system are very simple, the operation of the dust collector maintenance workload is less, collected materials can be directly recycled, basically no secondary pollution. Bag dust collector investment is higher than cyclone dust collector, maintenance workload is relatively more, but because the concentration of dust in the exhaust gas is generally not high here, so filter air speed can be selected higher, the equipment can be correspondingly smaller, the efficiency of the equipment is high, and the material removed can also be recycled locally, basically no secondary lift. Dust.
    Second, Raymond Mill tail gas dust removal system Raymond Mill exhaust dust system generally uses two grade dust removal system. The first stage uses cyclone separator, and the second stage is equipped with one-stage dust collector, such as bag filter or water bath dust collector.
    3. Dust removal system of wheel mill.
    (a) wet or wet type dust remover can be adopted in wet wheel mill. CZT cyclone is the main type of dry dust collector, and CCJ / A impulse dust collector is the main type of wet dust collector. The concentration of dust in the exhaust gas is not very high, so there is no need for continuous sludge discharge, just regular cleaning, mud can be directly into the pulp tank, waste water is very few.
    (b) a dry bag type dust collector can be used for the dust removal system of dry wheel mills. The material collected by this method can be reused directly. (4) The concentration of dust in the tail gas of spray drying tower is generally very high, so at least two stages of dust removal are needed. The first stage uses a cyclone separator, which is used as both a dust collector and a material collector; the second stage uses a spray precipitator, a foam precipitator, a Venturi precipitator or an impulse precipitator.
    _In the production of ceramic floor tiles, a large amount of dust will be produced during the transportation and unloading of fine powder from Raymond mill into the storage bin. Therefore, local exhaust hood and dust removal system should be installed at the molding equipment.
    2. exhaust gas treatment technology in molding process
    (1) The dust removal system of the manual friction brick press is generally better to have two or one manual friction brick press set up a dust removal system. The dedusting equipment can adopt cyclone separator, CCI impulse dedusting unit, water bath deduster and bag deduster. However, due to the high dispersion of dust in the fume produced by the brick press and the low concentration of dust, the cyclone separator is not suitable for practical engineering use less; CCI impulse dust collector is not used much, because this kind of dust collector has a large amount of air handling capacity, the resistance loss of the unit. Large and frequent water consumption will lead to waste of water and transfer of pollution. Most of the dust removal systems of manual friction brick press are water bath dust remover and bag type dust collector.
    (2) Automatic brick press dust removal system automatic brick press production is larger, more dust emission points, and larger air volume, so the general single automatic brick press independent dust removal system is more reasonable. Automatic pressure brick machine can use pulse bag filter and impulse dust collector.
    (3) The dedusting system of the sanitary ceramic spray glaze cabinet. The dedusting system of the sanitary ceramic spray glaze cabinet is set up by a single spray glaze cabinet, so that different glazes can be recycled separately. Dust removal system for sanitary ceramics spray glaze cabinet. At present, wet dust collectors are mostly used, such as water bath dust collectors.
    3. treatment technology of burning waste gas
    (1) The dust removal equipment of the ventilation and dust removal system of sanitary ceramics before entering the kiln generally adopts the water bath dust collector. Because the dust concentration produced by cleaning the dust in front of the ceramic kiln is only about 100mg/m3, only a certain amount of water should be added to the dust collector to ensure the required constant water level and keep the dust removal efficiency stable. The dust remover only needs to clear mud regularly.
    (2) In order to reduce the emission of waste gas from kilns, coal can be converted into gas and supplied back to porcelain kilns as fuel; centralized gas generating stations can also be set up in large ceramic bases to supply commodities to ceramic factories. In addition, the bag type dust collector can be used for smoke exhausting in the coal fired tunnel kiln of a ceramic factory to eliminate smoke and dust.
    4. treatment technology of exhaust gas during processing of auxiliary materials
    (1) Treatment of waste gas from sagger preparation process During the preparation of sagger, dust-containing waste gas is produced during the process of blank processing, forming and firing. However, due to the coarse particles, high water content and small output of semi-dry pressing powder, most enterprises have not adopted waste gas control measures. A large amount of dust containing waste gas is produced when the sac material is crushed by the jaw crusher coarse crushing and wheel mill. A closed exhaust ventilation system should be set up for this pollution source. Dust is also produced when sieving is used. The sieve should be sealed as a whole and local exhaust hood and dust removal equipment should be installed. Dry or wet methods, such as bag filter or water bath filter, can be used for dust removal.

    (2) Dust-containing waste gas treatment in the preparation of hemihydrate gypsum (1) Dust produced when raw materials are prepared for dust treatment and treatment of large pieces of natural gypsum crushed by jaw crusher should be provided with an external dust cover at the feeding port of jaw crusher. The collected dust-containing waste gas can be treated separately or shared with Raymond mill tail gas. Dust removal equipment can be used as bag filter.
    Second, semi hydrated gypsum is used to prepare dust to treat gypsum dust when the semi water gypsum is prepared. The waste gas can be preheated and kept warm by dry-hot air and purified as a bag dust collector for back-blowing cleaning. In addition, it can be used to stir fry and dehydrate under the condition of larger particles to reduce dust in the process of frying.
    (3) The dust in the dust-containing waste gas of gypsum mould making is hemihydrate gypsum powder, which will coagulate and harden when it meets water. Therefore, the dry dust collector is suitable for the dust. The particle size of the stir-fried dust is very small, about 96% of the particle size is less than 5 micron, so the cyclone dust collector is not suitable for the dust removal equipment, but the pulse bag dust collector can be used.
    Swirling plate tower www.xuanliubanta.com
    In recent years, glass mosaic as a more common decoration materials, its cheap and beautiful, strong and durable, acid and alkali resistance, soft and bright color, well received by people. However, the pollution of the waste gas, especially the fluorine-containing waste gas produced in the production process of glass mosaic, seriously restricts the development of the industry, and is of great concern to the society. How to deal with the waste gas in glass mosaic production is not only a problem that manufacturers must solve, but also a requirement of the relevant state environmental protection departments and society.
    Waste gas purification tower of cyclone plate column
    The main raw materials for producing glass mosaics are sea sand, soda ash, fluorite, sodium fluosilicate and sodium nitrate. Dust discharged from the feeding port and fluorine-containing waste gas discharged from the chimney outlet during the production process seriously pollute the environment.
    Exhaust gas treatment process:
    1. Improvement of combustion conditions: Increase the exhaust volume of the exhaust flue, and increase the exhaust volume from 800 square meters/h to 12000 square meters/h with the induced draft fan.
    2. Fluorine removal from waste gas: in the process of glass mosaic melting, raw and auxiliary materials such as fluorite, sodium fluosilicate, etc. are decomposed at high temperature to produce fluorine-containing waste gas such as silicon tetrafluoride.
    3. Dust removal: install air hood at the inlet and outlet, lead the overflowed alkali dust and waste gas to gravity dust collector, after recovering alkali dust, the tail gas enters the absorption tower to remove fluorine. The size of the gravity dust collector is selected by the specific conditions of the furnace.
    Swirling plate tower www.xuanliubanta.com
    Analysis of how to deal with exhaust gas from ceramic kiln
    At present, the waste gases produced by ceramic kilns can be roughly divided into two categories, the first is the process waste gases mainly containing productive dust. The temperature of this kind of waste gases is generally not high, mainly from the crushing, screening, granulation and spray drying in the preparation of green materials, glazes and colors; the second is the various kiln firing equipment in the second category. The high-temperature flue gas produced in production contains carbon monoxide, sulfur dioxide, nitrogen oxides, fluorides and soot. These exhaust gases have a large amount of emissions, many emission points, high content of free silica in the dust, and high dust dispersion in the exhaust gas. The dust in these exhaust gases is basically close to or belongs to ultrafine dust. Therefore, inertial dust collector and medium-effect cyclone dust collector are not applicable in single-stage dust collection system. If the cyclone dust collector is needed, it is necessary to select high-efficiency cyclone dust collector, also known as cyclone tower www.xuanliubanta.com. If only from the particle size of dust, wet dust collector, bag dust collector and electrostatic precipitator are building ceramics raw materials industrial waste gas purification system more suitable dust removal equipment.
    Treatment of waste gas from sagger preparation process during the sagger preparation process, the industrial furnace dusty waste gas is produced in each link of blank processing, molding and firing. However, due to the coarse particles, high water content and small output of semi-dry pressing powder, most enterprises have not adopted waste gas control measures. A large amount of dust containing waste gas is produced when the sac material is crushed by the jaw crusher coarse crushing and wheel mill. A closed exhaust ventilation system should be set up for this pollution source. Dust is also produced when sieving is used. The sieve should be sealed as a whole and local exhaust hood and dust removal equipment should be installed. Dry or wet methods, such as bag filter or water bath filter, can be used for dust removal.
    Dust-containing waste gas treatment in the preparation process of hemihydrate gypsum: 1. Dust produced when crushing large pieces of natural gypsum with jaw crusher for raw material preparation and dust treatment should be provided with an external dust cover at the feeding port of jaw crusher. The collected dust-containing waste gas can be treated separately or shared with Raymond mill tail gas. Dust removal equipment can be used as bag filter.
    Second, semi hydrated gypsum is used to prepare dust to treat gypsum dust when the semi water gypsum is prepared. The waste gas can be preheated and kept warm by dry-hot air and purified as a bag dust collector for back-blowing cleaning. In addition, it can be used to stir fry and dehydrate under the condition of larger particles to reduce dust in the process of frying.
    The dust in the dust-containing waste gas of gypsum mould making is hemihydrate gypsum powder, which will coagulate and harden when it meets water. Therefore, the dry dust collector is suitable for the dust. The particle size of the stir-fried dust is very small, about 96% of the particle size is less than 5 micron, so the cyclone dust collector is not suitable for the dust removal equipment, but the pulse bag dust collector can be used.

    Treatment technology of burning waste gas:
    (1) The dust removal equipment of the ventilation and dust removal system of sanitary ceramics before entering the kiln generally adopts the water bath dust collector. Because the dust concentration produced by cleaning the dust in front of the ceramic kiln is only about 100mg/m3, only a certain amount of water should be added to the dust collector to ensure the required constant water level and keep the dust removal efficiency stable. The dust remover only needs to clear mud regularly.
    (2) In order to reduce the emission of waste gas from kilns, coal can be converted into gas and supplied back to porcelain kilns as fuel; centralized gas generating stations can also be set up in large ceramic bases to supply commodities to ceramic factories. In addition, the bag type dust collector can be used for smoke exhausting in the coal fired tunnel kiln of a ceramic factory to eliminate smoke and dust.
    Swirling plate tower www.xuanliubanta.com
    Discussion on present situation and optimization measures of waste gas treatment in ceramic enterprises
    The desulfurization and dust removal equipment adopts high efficiency dust removal, desulfurization and corrosion resistant wet desulfurization and dust removal tower, multi-layer spraying and high efficiency mass transfer components, which effectively improves the desulfurization efficiency and can remove dust below 5 headings.
    The absorber body is made of carbon steel anticorrosion, and the interior parts are made of special glass fiber reinforced plastic and heat resistant to ensure the corrosion resistance of sulfur dioxide. The device has reliable sealing and earthing devices, and the leakage rate of the tower is <3%. The absorber consists of homogeneous cooling layer, desulfurization component, two-layer spray distributor and demister.
    Homogeneous cooling layer: Homogeneous cooling layer is designed above the inlet of flue gas, which not only realizes the uniform distribution of flue gas flow in the tower, but also reduces the flue gas temperature and improves the desulfurization effect at the back.
    Desulfurization components: the high-efficiency fluidized desulfurization and dust removal components in the desulfurization section are made of wear-resistant and fluorine-resistant components. When flue gas passes through the components, the flue gas forms a super fluidized zone between the plates, which makes the gas and liquid collide at high speed in the mass transfer field, forming a state in which the gas phase and the liquid phase are dispersed, and provides full contact and mixing of the gas-liquid-solid three phases.
    Mist eliminator: the use of swirl separation technology, the use of droplets of gravity and inertia, flue gas droplets touch the baffle and stay on the baffle, and then enter the drainage system, and finally fall into the slurry tank. The net smoke separated by the mist eliminator is generally less than 75mg/Nm3 and the average droplet diameter is less than 20um.
    Spray device: in the spray section, the flue gas flows from bottom to top, and the desulfurizer is ejected from top to bottom. According to the hydrodynamic characteristics of the tower, the flow rate of MP solid nozzle groups and nozzles in the large channel can not only ensure the uniform flow of flue gas in the tower, but also ensure the severe gas-liquid countercurrent contact in the reaction, and carry out the full mass transfer and heat transfer reaction.
    Advantages of swirl plate tower www.xuanliubanta.com than spray tower
    1. Cyclone tray tower www.xuanliubanta.com is an upgraded version of ordinary spray tower. The design is more humanized, packing and cleaning are more convenient, and can be reused. It is suitable for the treatment of continuous and intermittent exhaust gas.
    2. The technology is simple, the management, operation and maintenance are more convenient and concise, and will not affect the production of the workshop. At the same time, the acid mist absorber has a wider range of application, and the effect of removing mist is better.
    For the treatment of corrosive gases, such as acid and basic waste gases, liquid absorption is often adopted. The key to the treatment of the waste gas by liquid absorption is the choice of purification equipment.
    At present, our company has independently developed acid and alkaline waste gas purification process, acid mist absorption tower and acid mist absorber equipment with high purification efficiency, simple operation and management, long service life, combined with advanced technical experience in the fields of dust collector, dust collector and desulfurization dust collector.
    The process and products have the characteristics of simple structure, low energy consumption, high purification efficiency and wide application range. Acid mist absorber can effectively remove hydrogen chloride (HCl), hydrogen fluoride (HF), ammonia (NH3), sulfuric acid (H2SO4), chromic acid (CrO3), cyanic acid (HCN), alkali vapor (NaOH), hydrogen sulfide (H2S), formalin (formalin). HCHO) water soluble gas.
    The acid mist exhaust gas is introduced into the acid mist absorber by the air duct, and through the packing layer, the exhaust gas and the sodium hydroxide absorption liquid are fully contacted to absorb and neutralize the gas-liquid two-phase reaction. The acid mist exhaust gas is purified, dehydrated and defogged by the demister plate, and then discharged into the atmosphere by the fan. The absorption liquid is pressurized by the pump at the bottom of the tower and then sprayed down at the top of the tower. Finally, it is recycled to the bottom of the tower for recycling. The purified acid fog exhaust gas meets the discharge requirements of Guangdong provincial emission standards and is lower than the national emission standards.

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