Powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification

Abstract

The invention relates to a powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification. The device is characterized by comprising a normal-pressure bin, a variable-pressure bin and a feeding bin which are sequentially arranged from top to bottom, wherein the gas outlets of the normal-pressure bin, the variable-pressure bin and the feeding bin are connected with respective bag-type dust collectors respectively; an outlet control valve is arranged on a gas discharge pipeline; the fluidized gas inlets of the normal-pressure bin, the variable-pressure bin and the feeding bin are connected with a gas supply source through respective fluidized gas pipelines; the pressure gas inlets of the variable-pressure bin and the feeding bin are connected with the gas supply source through respective pressure gas pipelines; the variable-pressure bin and the feeding bin are connected through a pressure balance pipeline; a pressure balance valve is arranged on the pressure balance pipeline; and a coal dust outlet of the feeding bin is connected with a nozzle through a coal dust conveying pipeline. The invention also provides a coal dust conveying method adopting the powdered coal pressure dense-phase conveying device of dry coal dust pressure gasification. The device and method provided by the invention can perfectly realize uniform distribution and conveying stability of powdered coal flow on the conveying pipeline to accurately control the powdered coal conveying flow.

Description

technical field [0001] The invention relates to a pulverized coal pressurized conveying device and method in the pulverized coal pressurized gasification process, in particular to a pulverized coal feeding device and method suitable for entrained gasification. Background technique [0002] Entrained bed pulverized coal pressurized gasification technology has been widely used in IGCC power generation, synthetic ammonia, coal-to-hydrogen and other industries due to its advantages of wide adaptability of coal types and high conversion rate. Pulverized coal pressurized feeding technology is one of the core and key technologies of entrained bed gasification. The pulverized coal feeding method and device directly affect the safety, stability, reliability and gasification efficiency of the entire gasification system. Most of the existing pulverized coal feeding methods use screw feeders and rotary feeders. [0003] The Chinese patent whose publication number is CN1376761 has intro...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a single-way or multi-way conveying of pulverized coal pressurized silos through the pulverized coal pneumatic conveying method, so as to realize the stable, controllable and uniform distribution of pulverized coal feed, and overcome the existing spiral The feeder and rotary feeder are poorly sealed and it is difficult to accurately control the feed flow rate, so as to achieve the purpose of stable and efficient operation of the gasifier

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