A differential pressure time-sequential mixing control method for a bag filter

Abstract

The invention relates to a pressure difference-timing sequence mixed control method for a bag type dust collector. The method includes S1) a step of setting pressure difference dust collecting work conditions comprising a pressure difference upper limit value PH and a pressure difference lower limit value PL with the PL being less than the PH, and setting timing sequence dust collecting work conditions comprising a timing sequence cycling time T5, S2) a step of circulating dust collecting wait, allowing a timer T to be started from zero and detecting the pressure difference P between upper and lower boxes of the dust collector, and S3) a step of, when the pressure difference P reaches the pressure difference upper limit value PH, controlling Q electromagnetic pulse valves to perform a plurality of times of circulated dust clearing under work parameters for pressure difference dust collecting until the pressure difference P is not more than the pressure difference lower limit value PL, and returning to the step (S2); and when the pressure difference P does not reach the pressure difference upper limit value PH and the T from the timer is larger than the timing sequence cycling time T5, controlling the Q electromagnetic pulse valves to perform one time of circulated dust clearing under work parameters for timing sequence dust collecting, and returning to the step (S2). Compared with the prior art, the method is advantaged by being capable of pressure difference control, energy-saving and efficient, and the method can improve stability of circulated dust clearing for the bag type dust collector and can prolong the overall lifetime of filter bags.

Description

technical field [0001] The invention relates to the field of bag dust collector system control, in particular to a differential pressure timing mixing control method for bag dust collectors. Background technique [0002] Bag filter pulse jet dust cleaning is mainly divided into two control methods: pressure difference or time sequence. [0003] Pressure difference control method: According to the resistance on both sides of the filter bag (that is, the pressure difference between the upper and lower boxes of the dust collector) to determine whether to clean dust, according to the set pressure difference upper limit and pressure difference lower limit (pressure difference upper The limit value is greater than the lower limit of the pressure difference), after the dust passing through the filter bag increases, the pressure difference gradually rises to the upper limit of the pressure difference, carry out intensive centralized dust cleaning, and stop cleaning when the pressure...

AI Technical Summary

Problems solved by technology

Due to the pressure difference control method, the cleaning cycle will be concentrated in a certain period of time. This intensive cleaning will cause a very large load on the filter bag. It often happens that the filter bag is damaged before the design expectation and needs to be replaced and maintained. Phenomenon, increasing the cost of filter bag replacement and maintenance

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