Pulverized coal lock hopper discharging system and discharging method

Abstract

The invention discloses a pulverized coal lock hopper discharging system. The pulverized coal lock hopper discharging system comprises a pulverized coal lock hopper, a pulverized coal feeding tank, apulverized coal lock hopper outlet pressure adjusting pipe, a pneumatic conveying pipe and a DCS control system; a pulverized coal lock hopper high-material-level switch is arranged on the upper portion of the side wall of the pulverized coal lock hopper, and a pulverized coal lock hopper low-material-level switch is arranged on the lower portion of the side wall of the pulverized coal lock hopper; a pulverized coal lock hopper pressure sensor is further arranged on the pulverized coal lock hopper; and a pulverized coal feeding tank pressure sensor is arranged on the pulverized coal feeding tank. According to the pulverized coal lock hopper discharging system, a pneumatic and gravity scheme is adopted, undisturbed switching of pneumatic conveying and gravity conveying is ensured in the discharging stage of the pulverized coal lock hopper, and extremely high practicability is achieved; and the bridging phenomenon in the discharging process is automatically judged through program logic,the flow fluctuation of the pulverized coal conveying pipeline caused by the fact that a traditional discharging system only adopts gravity discharging is avoided, and the defects that the material level stabilizing time is short and the discharging continuity is poor due to the fact that pneumatic conveying is purely relied on are overcome.

Description

Technical field: [0001] The invention relates to a feeding system and a feeding method, in particular to a feeding system and a feeding method of a pulverized coal locking hopper. Background technique: [0002] As a new coal gasification technology developed at home and abroad in recent years, pulverized coal gasification has the characteristics of high gas production efficiency, low water consumption and high conversion rate compared with traditional coal-water slurry gasification, and is widely used in today's coal chemical industry. Industry; pulverized coal high pressure dense phase conveying device is an essential part of pulverized coal gasification, including pulverized coal feed tank and pulverized coal lock bucket. [0003] For the pulverized coal gravity conveying technology, the principle is that when the pulverized coal feeding tank and the pulverized coal locking bucket have the same pressure, the pulverized coal is fed by its own gravity. However, due to the ch...

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Problems solved by technology

[0003] For the pulverized coal gravity conveying technology, the principle is that when the pressure of the pulverized coal feed tank and the pulverized coal lock hopper are the same, the powdered coal is fed by its own gravity, but due to the characteristics of the pulverized coal itself, including temperature, pressure, density and other factors The impact will cause the powdered coal to form a bridge in the conical section of the lock bucket during the feeding process, which will hinder the feeding process, resulting in fluctuations in the flow rate of the pulverized coal delivery pipeline, and affecting the stable delivery of the system;

[0004] Compared with the pulverized coal gravity conveying technology, the principle of the pneumatic conveying technology is that the pulverized coal lock hopper and the pulverized coal feeding tank form a pressure difference, and the pulverized coal is conveyed through the pneumatic conveying regulating valve and pipeline. Gas, there are disadvantages such as slow material level stabilization time and poor feeding continuity

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