Method and device for cleanly storing and feeding coal slurry fuel of electric power plant

Abstract

The invention provides a method for cleanly storing and feeding coal slurry fuel of an electric power plant. The method comprises the following processes of: pre-treating coal slurry, protecting and storing the coal slurry, feeding the coal slurry, pumping the coal slurry and feeding the coal slurry with a boiler. The invention also provides a device for cleanly storing and feeding the coal slurry fuel of the electric power plant. The device comprises a coal slurry pre-treating system, a coal slurry protection and storage device, a pre-pressurized feed screw (4), a flashboard valve (3), a coal slurry transmission pump (5), a coal slurry transmission pipeline (6), a rotation type dense material dividing valve (13), a coal slurry feeding device and an electric power plant boiler. The invention overcomes a plurality of defects existing in the prior art and provides the brand new method and the corresponding device for transmitting the cola slurry to the electric power plant boiler.

Description

technical field [0001] The invention relates to the field of fuel processing and transportation, in particular to a method for clean storage, transportation and feeding of coal slime fuel in a power plant and equipment for realizing the method. Background technique [0002] After the raw coal is mined, it is generally washed. The main component of the coal slime produced during the washing process is carbon, and contains impurities such as gangue and clay. After dehydration, it becomes primary coal with a solid content of 72-77%. Coal slime, the particle diameter is less than 0.5mm, and the solid calorific value is 14644-18828KJ / Kg. Primary coal slime is a viscous solid material with an apparent viscosity above 10 poise (kinetic viscosity unit), even tens of thousands of poise. Exhibits little fluidity and great cohesion. It is characterized by high ash content, fine particles, high viscosity, strong water holding capacity, and high cohesion, making it difficult to transpo...

AI Technical Summary

Problems solved by technology

However, due to the lack of reliable and applicable treatment methods and equipment for coal slime removal, homogenization, slurry retention, feeding and suction, pipe flow distribution, coal slime diversion, high-pressure pipe flow anti-backflow and combustion feed, the utilization of coal slime is limited. Promotion and popularization of combustion power generation

The existing method of transporting coal slime to power plant boilers mainly has the following deficiencies: one, coal slime is often mixed with some massive and fibrous impurities during storage and transportation, and some of these impurities are difficult to break, such as iron nuggets, iron wires, cables , steel wire ropes, etc., although some can be broken but the cost is relatively high, such as stones, gangue, wood, etc., these impurities will cause entanglement, jamming of equipment, and blockage of the slime channel, affecting the pretreatment of the slime, Conveying and feeding, leading to the failure of conveying and feeding, interrupting the supply of coal slime to the boiler of the power plant, and seriously causing damage to equipment and even casualties; When a fault occurs, the standby system cannot be activated in time, resulting in the interruption of the coal slime delivery to the boiler of the power plant; third, the coal slime will flow back during pipeline transportation, which affects the transmission efficiency and wastes energy; fourth, the feeding equipment is easy to coke and block, And it is difficult to clean; fifth, the delivery pipeline adopts plug-in installation throughout, and it is extremely difficult to disassemble and replace

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