Pulsed blowing ash-removal control system of large-scale bag-type deduster, and control method therefor

Abstract

The invention provides a pulsed blowing ash-removal control system of a large-scale bag-type deduster, and a control method therefor. The pulsed blowing ash-removal control system of a large-scale bag-type deduster comprises a control power supply, a pulse valve, a blowing-out valve relay and a storehouse change relay. A negative pole of the pulse valve is connected orderly to a normally closed contact of the storehouse change relay and a normally opened contact of the blowing-out valve relay in series, and then is connected to a low-voltage port of the control power supply. A positive pole of the pulse valve is connected to a pulse valve relay normally-opened contact in series and then is connected to a high-voltage port of the control power supply. The control method adopts a fully automatic ash removal control mode, a centralized maintenance control mode and a deduster body safety interlock control mode. The pulsed blowing ash-removal control system of a large-scale bag-type deduster, and the control method therefor realize automatic ash removal of a dedusting system and ash removal of a standby storehouse used for storehouse change, guarantee intelligentization and rationalization of an ash removal process, and realize switching of various maintenance modes.

Description

technical field [0001] The invention belongs to the field of pulse bag dust collector system control, in particular to an intelligent control strategy for a pulse jet dust removal system of a large bag dust collector. Background technique [0002] With the urgent requirements of sustainable development and the continuous improvement of people's awareness of environmental protection, iron and steel enterprises have gradually increased their investment in environmental protection facilities. Widely used in polluted areas, it undertakes the key task of dust treatment for the blast furnace raw fuel supply system, feeding system, and casthouse system. The pulse jet dust cleaning system is the core of the bag filter, and its control strategy directly determines the reliability and economy of the filter operation. [0003] The working principle of the bag filter is: after the dust-laden flue gas enters the ash hopper of each warehouse in the bag filter, under the guidance of the a...

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Problems solved by technology

Based on this circuit mode, the current pulse cleaning control strategy for large bag filter has the following problems: 1. The automatic control is timing control or constant pressure difference control, which only realizes the simple cycle of the cleaning process, that is: all boxes participate in dust removal Work, according to the principle of timing or constant pressure difference, the dust cleaning work is carried out successively from the first box to the last box, and the next cycle is completed after the cleaning is completed; this control method cannot reflect that the large-scale dust collector has many boxes and strong backup capacity , support online maintenance and other advantages; 2. There is no centralized maintenance mode or centralized maintenance function and automatic dust cleaning process switching is unreasonable; 3. The signal linkage between the dust removal fan and the dust collector is not close enough, and the protection of the dust collector body is lacking

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