Pulverized coal feeding control device and pulverized coal feeding control method

Abstract

The invention relates to a pulverized coal feeding control device and a pulverized coal feeding control method. The device comprises a feeding device body and a control system, wherein the feeding device body comprises a coal hopper, a pulverized coal locking hopper, a pulverized coal feeding hopper, a central controller, relevant valves and a sensor; the central controller comprises a sequence control unit, an analog quantity and switch quantity input/output unit, a human-machine interaction unit and a field communication unit. The pulverized coal feeding control device is preset with a pulverized coal feeding control method. According to the pulverized coal feeding control method, a field feedback signal is judged, a corresponding time sequence action instruction is generated, the valves are controlled to be opened and closed according to a preset procedure, and therefore, the pulverized coal feeding process is automatically finished. By further arranging a dual-decompression valve, a valve site feedback device and a valve action timer, the security risk and the fault rate in a feeding process are substantially decreased; and by setting a locking hopper pumping control process and a locking hopper discharging circulating control process in the pulverized coal feeding control method, the problems that bridging and discharging of pulverized coal are not smooth under an alternating pressure are solved. The pulverized coal feeding control device is high in control precision, strong in anti-jamming capability and low in error rate, the operation difficulty is substantially reduced, errors of manual operation are avoided, and the automatic, continuous, stable and safe pressurizing feeding of the pulverized coal is realized.

Description

technical field [0001] The invention relates to the feeding of solid powder in the field of energy and chemical industry and its automatic control method, in particular to a pulverized coal feeding control device and method. Background technique [0002] The pressurized feeding and transportation of pulverized coal is the key to pulverized coal gasification and pyrolysis technology, and the core to maintain the stable long-term operation of the process system. At present, there are mainly two technical solutions for pressurized coal powder feeding: one is dry coal powder alternating pressure pneumatic conveying technology; the other is coal water slurry conveying technology. In the field of pulverized coal pressurized feeding technology in my country, the alternating pressure conveying technology has occupied a dominant position for a long time. [0003] The alternating pressure conveying technology mostly adopts the lock hopper system to realize the pressurized conveying p...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of bridging, material hanging, low conveying accuracy, unstable conveying and high operating intensity in the process of pulverized coal alternating pressure feeding in the prior art

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