High efficient and environment-friendly pebble coal full-sealing discharge device

Abstract

The invention relates to equipment in a thermal power plant, and particularly relates to a high efficient and environment-friendly pebble coal full-sealing discharge device applied to a quick grinding pebble coal discharge system in a thermal power plant. The device comprises a transition pipeline, wherein the tail end of the transition pipeline is connected with a gas-tight silo; the gas-tight silo consists of a silo body and a sealing cover which is driven by a cylinder; a transferring box is arranged below the sealing cover; the top of the transferring box is provided with a feed port; a sealing ring is arranged between the edge of the feed port and the bottom surface of the sealing cover; the top of the sealing cover is provided with a lower shell; the lower opening of the silo body is provided with an upper shell; the upper shell and the lower shell are interlaced, sleeved and closed; the top of the sealing cover is also provided with a gas-tight cavity; the lower end of the joint gap between the upper shell and the lower shell is sealed in the gas-tight cavity; and the outer wall of the gas-tight cavity is provided with a sealed air inlet connected with a compressed air source. By adopting the high efficient and environment-friendly pebble coal full-sealing discharge device, dust pollution in a pebble coal working environment can be reduced, the labor intensity is lowered, and water and electricity consumption of auxiliary equipment are saved.

Description

technical field [0001] The invention relates to thermal power plant equipment, in particular to a high-efficiency and environment-friendly pebble coal fully sealed discharge device used in a medium-speed pebble coal discharge system of a thermal power plant. Background technique [0002] Medium-speed mills in thermal power plant equipment are less adaptable to coal types than steel ball cylinder coal mills, but within the scope of their applicable coal types (grinding bituminous coal and lean coal), they have less metal consumption and less investment. Coal grinding has the advantages of low power consumption, low metal wear and low noise, so it is widely used in power plant boiler units. The pebble coal produced during the operation of the medium-speed mill mainly comes from gangue, pyrite, etc., which are dense and difficult to grind in the raw coal. When the coal mill is running, the pebble coal falls below the wind ring and is sent into the pebble coal hopper by the scra...

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Problems solved by technology

[0003] The slag discharge method of the existing medium-speed coal mill basically adopts the buffer box type slag discharge system, which is discharged on the spot and manually cleaned and transported. After a period of operation, the slag discharge door has internal leakage and external leakage. Factors of the design of the machine itself and coal quality affect the increase of the slag discharge volume of the pebble coal, so that the entrance door and the exit door of the slag discharge door of the pebble coal are frequently opened, the slag discharge door is severely worn, the door panel is deformed, and the plug is not closed properly, resulting in serious air leakage. During slag discharge, the positive pressure gas in the slag box carries a large amount of dust, seriously polluting the surrounding environment, which has become a problem that many thermal power generation companies are focusing on solving. The common discharge of pebble coal has three types: manual discharge, hydraulic discharge, and mechanical discharge. Due to the characteristics of high density (1.0~1.5 t / m3), large particles (≤60mm), high hardness, high temperature (about 150°C), and dust content, pebble coal has certain advantages in processing and transportation. Difficulty, the above treatment methods are difficult to achieve the desired effect

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