Method for improving internal fluidizing condition of fluidized bed equipment

Abstract

The invention discloses a method for improving an internal fluidizing condition of fluidized bed equipment, and relates to the technical field of coal gasification. According to the method, the feed coal at industrial level and with wide particle size distribution or the feed coal with large componenticle size can be utilized under a medium and high pressure gasification condition for improving the internal fluidizing condition of the fluidized bed equipment, enabling the feed coal particles to be fluidized well, as well as avoiding a dead fluidizing area; the phenomenon of adhering or slab-bonding of particles can also be avoided under the oxygen charging gasification condition. The method is characterized in that air flow is input to a volatile fluidizing area in the fluidized bed equipment under operation to remove the problems that materials are accumulated and gas and solid cannot be contacted uniformly in the fluidized bed equipment, wherein materials are accumulated in the volatile fluidizing area, and gas and solid cannot be contacted uniformly in the volatile fluidizing area; the input air flow is in a direction adapted to the direction a fluidizing field is promoted to be formed, and the flow rate of the air flow is higher than the minimum fluidizing speed of the particles in the volatile fluidizing area. The method is applicable to coal gasification of the fluidized bed.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a method for improving fluidization conditions in fluidized bed equipment. Background technique [0002] Fluidized bed coal gasification technology is one of the earliest industrialized coal gasification technologies. Its process is that the raw coal in the fluidized bed equipment is kept in suspension under the action of the bottom-up gasification agent, and the raw coal is continuous due to high temperature. Continuous boiling, and rapid gasification reaction and heat exchange. [0003] The bottom of the fluidized bed equipment is usually equipped with a gasification agent distribution device (commonly referred to as "distribution plate"), and the distribution plates used in industrial-scale fluidized bed equipment generally include flat plate distribution plates and conical distribution plates. Among them, the flat distribution plate is easy to cause channeling and ...

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Problems solved by technology

[0004] However, under medium and high pressure gasification conditions, since the gasification pressure in the fluidized bed equipment is generally 2.5 to 3.5 MPa, under this pressure, the gasification agent entering the fluidized bed equipment is severely compressed and its physical properties change. changes, the gas velocity entering the fluidized bed equipment decreases, while the physical properties of the raw coal are not affected. Therefore, the influence of the pressure in the fluidized bed equipment on the gasification agent gas velocity is far greater than that of the minimum fluidization of the raw coal Influenced by the speed, the gas velocity in the fluidized bed equipment is low, and the fluidization of the material particles is no

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