High-temperature semicoke grinding system and grinding method

Abstract

The invention discloses a high-temperature semicoke grinding system and a grinding method. The system comprises a pyrolyzing furnace, a high-temperature speed adjustment material feeder, a raw coal bunker, a coal feeder and a pulverizer, wherein the high-temperature speed adjustment material feeder is arranged between the pulverizer and the pyrolyzing furnace; the coal feeder is arranged between the pulverizer and the raw coal bunker; the pulverizer comprises bearings and a barrel body; the bearings are arranged on two sides of the barrel body; the barrel body comprises a material inlet, a material outlet and a shell; the material inlet and the material outlet are respectively located at two ends of the barrel body; the shell is located on the surface layer of the barrel body; a water cooling cavity is arranged in the shell; and the shell further comprises a cooling water inlet and a cooling water outlet. The system solves the problem of grinding at a high-temperature state of high-temperature semicoke; the high-temperature semicoke is ground at high temperature to prepare high-temperature coke powder which can be directly conveyed into a boiler for combustion through pneumatic conveying; and therefore, direct pulverizing, conveying and utilization of the high-temperature semicoke are realized.

Description

technical field [0001] The invention belongs to the technical field of coke powder and coal powder combustion power generation, and in particular relates to a high-temperature semi-coke grinding system and method. Background technique [0002] my country is rich in coal resources, and most of the raw coal is used for direct combustion except for coking and conversion processing. The direct combustion of coal leads to the fact that the oil and gas resources rich in coal have not been fully refined and utilized, and the thermal efficiency of direct combustion is low, which seriously damages the environment. The pyrolysis of coal is to heat coal under an inert atmosphere to produce semi-coke, gas and tar and other products. These products can be used in stages to fully extract oil and gas resources while improving coal, especially lignite and coal. Comprehensive utilization efficiency of long flame coal. [0003] The prior art discloses a power plant semi-coke powder injectio...

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Problems solved by technology

[0005] The above-mentioned prior art has the following disadvantages: (1) high-temperature semi-coke needs to be cooled before entering the coal mill for grinding, and the original surface heat is not utilized; (2) high-temperature semi-coke needs to consume a large amount of cooling water during the cooling process, Increase the production cost of semi-coke; (3) The system needs to be equipped with a cold coke machine, which increases the complexity and investment of the system; (4) The structural characteristics of the mill limit the material temperature; (5) Due to the structural characteristics of the cylinder, the material temperature It should not be too high, generally limited to below 400°C. If it exceeds the above range, the temperature of the ball mill body and bearings will rise, which will affect the strength of the cylinder and the safe operation of the bearings; (6) Steel balls and liners inside the mill The contact area determines the production efficiency of the mill, and the contact area is limited by the diameter and length of the ball mill. If the production capacity is increased, the length and diameter of the ball mill need to be increased, which will greatly increase the production cost of the mill.

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