Explosion-proof and blowout-proof device of coal powder storage tank and powder feeding technological process

Abstract

The invention discloses an explosion-proof and blowout-proof device of a coal powder storage tank, which can avoid powder blowout, and a powder feeding technological process. The explosion-proof and blowout-proof device comprises an explosion-proof valve, wherein the explosion-proof valve is further provided with a locking device; the locking device is connected with a safety control system; the locking device is fixed on a support; the support is fixed on the coal powder storage tank through a support bottom plate; the safety control system comprises a PLC (programmable logic controller), a pressure sensor, a pressure transmitter and a driving cylinder; the pressure sensor is fixed inside the coal powder storage tank and transmits a signal to the PLC through the pressure transmitter; the driving cylinder is fixed on the support and is connected with the locking device; the driving cylinder receives the signal of the PLC and pushes or pulls the locking device. Through design of the reasonable powder feeding technological process and a reasonable pressure value parameter, the powder blowout is reduced to the maximum extent.

Description

technical field [0001] The invention belongs to an explosion-proof valve device for a pulverized coal storage tank and a powder feeding process flow. Background technique [0002] The pulverized coal storage tank is an important supporting equipment for high-efficiency and clean pulverized coal industrial boilers, and is used to store about 200 mesh fuel pulverized coal. Because the pulverized coal particles are extremely fine, the feeding and discharging of the pulverized coal storage tank adopts the pneumatic conveying method powered by compressed air. A large amount of coal dust will be generated in the pulverized coal storage tank under the push of compressed air during feeding. The gas-powder mixture is filtered through the tank top dust collector and then discharged to the atmosphere to meet the standard air, leaving the pulverized coal in the pulverized coal storage tank to complete the process. During the feeding process, the working pressure of the pulverized coal ...

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Problems solved by technology

[0003] Since pulverized coal is flammable and explosive, in order to ensure safety, the pulverized coal storage tank is not only equipped with carbon dioxide cooling and fire extinguishing devices, but also equipped with explosion-proof valves, such as figure 1 However, when feeding, it often happens that the pressure in the storage tank reaches or exceeds the opening threshold of the explosion-proof valve (greater than 1KPa, but less than 0.4Mpa for the working pressure of the pulverized coal storage tank), the explosion-proof valve opens, and the gas-powder mixture passes through the explosion-proof valve, The event of air pollution caused by the discharge of the pressure relief port of the explosion-proof valve cover into the atmosphere is called "dust spraying". figure 2 As shown, there is no device for reasonable control of the explosion-proof valve

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