The selection of commonly used air compressors for pulse bag dust collectors: Bag dust collectors are widely used in industries such as building materials, metallurgy, chemical, textile, petrochemical, etc. The automatic control system for bag dust collectors can be applied in all industries of bag dust collectors to achieve automatic control of the filtration system and dust cleaning system during the bag dust removal process. For different industries, we can design optimal control schemes based on the controlled objects to achieve optimal control effects. According to the specific bag dust removal method and the requirements for bag dust removal detection and control points, PLC control and DCS control are adopted The control system runs stably, with good dust cleaning effect and smoke emissions meeting relevant standards. The pulse bag filter is located at the negative pressure end of the fan, and the filter adopts a multi chamber structure with separated bag chambers. When a certain bag is used for dust cleaning, the offline valve is controlled to open and close, so that the filter bag is cleaned and the dust falls into the ash hopper. The dust is transported away through the ash conveying and discharging device, and the purified gas flows through the pores of the dust removal filter bag and is discharged into the atmosphere through the exhaust pipe. When selecting an air compressor for a pulse bag filter, attention should be paid to the following three aspects: first, choose the corresponding compressor and supporting equipment according to the requirements of the pulse bag filter for the compressor gas. There are several points to consider: 1. To reduce the oil content in compressed gas, a degreasing purifier can be used. If the required treatment indicators are high, multi-stage treatment can be used. 2. To reduce the water content in compressed gas, a matching water removal equipment can be used. 2、 Select the compressor structure based on the production task of the pulse bag filter and the specific conditions of the factory, such as vertical, horizontal, or angular. 3、 Select the appropriate model from the corresponding compressor sample or product catalog based on the required exhaust volume and pressure during the production of pulse bag dust collectors. It should be noted that the exhaust volume listed in the compressor sample or product catalog is generally calculated based on the gas volume at 20 ℃ and 101.33kPa, in m3/min, and the exhaust pressure is expressed in Pa (gauge pressure). When determining the performance parameters of the air compressor required for the production of pulse bag filters, the following aspects should be considered: 1. Exhaust pressure. The higher the discharge pressure of the compressor, the more energy it consumes. The sum of pressure, pipeline resistance loss, and pressure of supporting equipment shall be determined as the lower limit of the rated discharge pressure of the selected compressor. In general, the diameter of the gas pipeline should be chosen to be larger to reduce resistance losses and achieve the goal of reducing energy consumption during long-term operation. Do not use compressors with excessively high exhaust pressure. 2. The exhaust volume is calculated by multiplying the actual total gas consumption by a coefficient of 1.1-1.2 to determine the exhaust volume for the selected model of pulse bag filter. If the selection is too low, it will not meet the specified value of gas for pulse bag filter; If too large is selected, it will result in high energy consumption and uneconomical operation during load reduction, and the purchase cost of using a large displacement compressor is also high. 4、 Before purchasing, careful consideration should be given to avoid discovering problems only when using the pulse bag filter. Requirements for gas source of pulse bag filter: The compressed air system of pulse bag filter includes compressed air pipeline, gas storage tank and corresponding accessories. According to the working principle of the pulse dust collector and the structural characteristics of the instruments and components in the dust cleaning control system, there should be restrictions on the pressure of the compressed air before entering the dust collector air bag, as well as requirements for the air quality. Because high or low pressure and good or bad temperament can affect the cleaning effect. The pressure of compressed air used for dust removal has a significant impact on the dust removal efficiency. According to the operating requirements of the pulse bag filter, the compressed air pressure range for dust cleaning is 0.02~0.8MPa. Therefore, it is required to install a pressure reducing device at the inlet of the outdoor pipeline network or a separate gas supply system to control the pressure within the required range. Normal operation not only requires stable pressure, but also requires uninterrupted gas supply. If there is a large fluctuation in the pressure and volume of the gas source, a gas storage tank can be used to store a relatively stable amount of gas. The volume and structure of the gas storage tank are determined based on the required air volume and pressure of the dust collector working simultaneously over time. When the gas storage tank cannot meet the requirements, a separate gas supply system should be installed, otherwise it will affect the normal operation of the dust collector. If the oil, water and dirt in the compressed air are not clear, it will not only block the air path of the instrument and the hole of the injection pipe, affecting the dust removal effect, but also affect the dust removal efficiency once it is sprayed on the filter bag and bonded with the dust. Therefore, it is required to install a centralized filtering device at the inlet of the compressed air as a secondary filter to remove condensed water and oil stains inside the pipe. To prevent poor or ineffective filtration, a small air filter needs to be installed before the air bag of the dust collector.
