How to Choose the Right Chemical Filter
Release time:
2020-10-09
How to make the right choicechemical filter
The chemical filter is a new type of filtration system, which has the advantages of high filtration accuracy, large processing capacity, low cost, convenient use and maintenance, complete specifications, diverse materials, and wide application range. Mainly used in: food, health, pharmaceutical and other industries.
chemical filterAccording to the number of bags, it can be divided into single bag type and multi bag type, and according to the position of the feeding hole, it can be divided into side entry type and top entry type. The side-entry type has now been replaced by the top-entry type. In addition, according to the user's requirements for filtration temperature, sandwich filters can also be provided, usually with a double-layer structure. The sandwich may be a steamed or thermally conductive oil to maintain or increase the temperature of the fluid, prevent the fluid from freezing, increase the filtration rate of the viscous liquid, or meet the process temperature of the following requirements.
Chemical filters manufactured according to the above principlesThere are many types. There are round cloth bags and flat cloth bags in the form of cloth bags. According to the position of the air inlet, there are upper and lower air inlets. The cleaning method is divided into manual cleaning, mechanical flapping, pulse blowing and reverse blowing.
Compared with other gas-solid separation equipment, chemical filters have the following advantages: high filtration efficiency, generally can maintain a filtration efficiency of more than 99%, and less dust in the gas discharged after filtration; select the appropriate filtration speed, the inlet particle concentration The change has little effect on filtration efficiency and pressure loss, high operational stability, and strong adaptability. Convenient recovery of powder, to achieve comprehensive utilization. The disadvantages are: checking and replacing the filter bag requires a lot of labor and harsh working conditions; the temperature of the filtered gas is limited by the heat resistance of the filter material.
In order to make full useThe advantages of chemical filters, the correct selection and design of bag-type mechanical filters is very important. To choose or design a bag mechanical filter, you must first understandchemical filterProduction process and operating conditions, and understand the quantity, composition, dust concentration and state parameters (temperature, humidity and pressure) of flue gas. At the same time, select suitable filter materials, dust removal methods and dust removal equipment according to these conditions.
Aluminum electrolysis flue gas has two characteristics: First, it has a large amount of smoke. For every ton of aluminum produced, the flue gas volume of the electrolytic cell flue gas discharge system will reach 150,000 to 200,000 m3, and the annual output of one electrolytic series is 60,000 tons of aluminum. The smog emission per hour is 1 to 1.4 million cubic meters; the second is miscellaneous. In addition to hydrogen fluoride, carbon dioxide and sulfur dioxide are present in the flue gas. There are also bitumen volatiles in the self-baking tank, and the discharge temperature is 70-90°C.The purification of aluminum electrolysis flue gas by the front-end method with chemical filters requires the addition of a large amount of alumina, so that the concentration of substances in the flue gas is as high as 20-100g/m3. According to the characteristics of large amount of flue gas, many sundries and high material concentration, it is necessary to specially design and manufacture a large special cloth bag type mechanical filter that can handle 5 × 104~1 × 106 m3 / h flue gas per hour.
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