Through the use of bag filter, sodium carbonate plant dust in the air for processing, plant dust concentration after treatment to achieve national standards, to achieve green production.
1 Overview
In the course of disposing the sodium carbonate solution, the adding method of sodium carbonate is manually accomplished. The raw material of sodium carbonate is in the form of powder and is very light. When the material is added, the dust is very big and the amount of dust is up to 15mg / m3, exceeding the national standard, directly endangering the employee's body health. According to the actual site investigation, the environmental protection department found that the source of pollution was mainly on the second floor feeding platform. To solve the hazard of dust, a baghouse was added on the second floor feeding platform.
2 dust collector structure and characteristics of chemical China
2.1 dust collector structure
Currently, in the field of dust removal technology, dust removal methods are many, sodium carbonate dust is used in the PL-A-type dust collector, which is based on the LPL single bag filter as the core of the newly developed, with small size, high dust removal efficiency specialty. Its basic structure is composed of fan, filter and dust collector composed of three parts, each part are installed in a vertical frame.
2.2 dust collector features
Bag test dust collector is a dry dust removal equipment. It is suitable for capturing small, dry, non-fibrous dust. The filter bag is made of textile cloth or non-woven felt, and the dusty gas is filtered by the filtering action of the fiber fabric. When the dusty gas enters the dust collector, the dust with large particle and large specific gravity settles down due to the action of gravity , Fall into the ash bucket, the gas containing finer dust passes through the filter media, the dust is blocked and the gas is purified. General new filter dust removal efficiency is not high enough. After the filter is used for a period of time, the surface of the filter bag accumulates a layer of dust due to the effects of sieving, collision, retention, diffusion and static electricity, and the layer of dust is called the primary layer. In the later movement, the primary layer becomes Filter the main filter layer, relying on the role of the first layer, mesh larger filter can get higher filtration efficiency. With the accumulation of dust on the surface of the filter material, the efficiency and resistance of the bag filter are correspondingly increased. When the pressure difference on both sides of the filter material is large, some fine dust particles attached to the filter material will be squeezed in the past , So that the bag filter efficiency decreased. In addition, the bag filter will cause the resistance of the dust removal system significantly decreased resistance. Therefore, the bag filter resistance reaches a certain value, to timely cleaning. Dust can not destroy the initial layer, so as to avoid the efficiency of decline.
3 dust collector in the sodium carbonate feed application
3.1 feed mouth dust treatment
Dust for the feeding port, design dust suction port, dust suction port installed in the original feeding port:
During the charging process, after the dust collector is started, a negative pressure will be formed around the air collecting port to make the dust suction inlet produce a negative pressure air flow belt of 10 to 30 cm above the charging material. The suspended sodium carbonate dust is effectively sucked into the pipe through the dust suction inlet, Into the central dust collector, containing sodium carbonate dust air through the dust filter inside the flat bag, sodium carbonate dust was blocked in the outer surface of the filter bag, the purified air will be through the filter bag into the fan, the fan sucked into the direct row Into the room.
3.2 after the air suspension of suspended powder handling
In the feeding hall, the central dust collector also has an air inlet, when the air inlet is cut off by the butterfly valve, the wind mainly concentrates on the charging inlet. After the charging is finished, the air inlet is cut off by the butterfly valve, and the air inlet is opened , So that the formation of negative pressure hall with the central belt, the hall was constantly circulating air, suspended air in the air filter is filtered, the air is purified.
3.3 duster after the effect
According to the actual working conditions on site, environmental monitoring department sampling and analysis of the feeding point and plant environment.
4 Conclusion
It can be seen from the above data that the use of the bag filter reduces the dust content of the sodium carbonate plant and the two-stage feeding platform of sodium carbonate so that the amount of sodium carbonate dust is strictly controlled within the international standards and the staff's Work environment, to ensure the physical and mental health of employees, eliminating the potential for unsafe production, to achieve environmentally friendly production.
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