Pebble Coal Comprehensive Utilization System

Abstract

A pebble coal comprehensive utilization system comprises a plurality of unit plants, a pebble coal conveying device and a circulating fluidized bed boiler; each unit plant is provided with a plurality of medium speed mills, and an auxiliary steam header is arranged in each unit plant; the pebble coal conveying device is connected with the medium speed mills of each unit plant; the pebble coal conveying device is connected with a pebble coal bin; the circulating fluidized bed boiler is connected with the pebble coal bin and is connected with a fan and a water supply device; the circulating fluidized bed boiler is connected with the auxiliary steam header of each unit plant through a boiler steam mother tube. According to the system, the circulating fluidized bed boiler burns the pebble coal, and heat generated by burning of the pebble coal heats supplied water, and therefore steam is generated and conveyed to the unit plants. Steam extraction capacity of turbines of the unit plants is reduced; the unit output is increased; coal consumption of the unit plants is reduced; the pebble coal comprehensive utilization system can comprehensively and efficiently utilize the pebble coal discharged from the unit plants; the problem that the pebble coal is accumulated and discharged, and the land is occupied is solved; and the environmental pollution is avoided.

Description

technical field [0001] The invention relates to a pebble coal processing system, in particular to a pebble coal comprehensive utilization system for processing pebble coal. Background technique [0002] In recent years, thermal power generating units have been developed rapidly, and a large number of large-capacity, high-parameter generating units have been put into production intensively. At the same time, medium-speed coal mills have been widely used. In the prior art, the medium-speed coal mill discharges particles that are not easy to grind during operation, and its main components include coal gangue, pyrite, etc., and also entrains some raw coal, which has a certain calorific value. At present, the discharged pebble coal particles are basically not used effectively, but are directly transported away or discharged to the slag removal system, which not only wastes a lot of energy, but also wastes a large area of ​​land due to the accumulation of pebble coal. [0003] Th...

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Problems solved by technology

At present, the discharged pebble coal particles are basically not used effectively, but are directly transported away or discharged to the slag removal system, which not only wastes a lot of energy, but also wastes a large area of ​​land due to the accumulation of pebble coal

[0003] The tight supply of coal has also caused the composition of coal in thermal power plants to change, and many power plants have a variety of coal supply methods, which will inevitably bring in a large amount of impurities during transportation, making the coal quality of many power plants and the design coal quality There is a large difference, so in the process of using the medium-speed coal pulverizer, a large amount of pebble coal will be discharged. In addition, many power plants have limitations in the selection of medium-speed coal pulverizer equipment and unreasonable operation methods. A large amount of raw coal is entrained in coal and discharged directly, which not only pollutes the environment, but also causes a lot of waste of energy

[0004] The discharge of pebble coal from existing power plants is unstable, and the composition of pebble coal is complex, so it is difficult to comprehensively treat and utilize the pebble coal discharged

For the current large-scale and large-capacity thermal power generation units, many medium-speed coal mills are installed. When the coal quality deteriorates and the operation mode is unreasonable, a large amount of pebble coal will be discharged, and it will be transported only by the pebble coal treatment system. It is not a wise move to abandon it, and the unit unit needs to consume a lot of steam during operation. Generally, the power plant is equipped with a start-up boiler or extracts steam from the unit to meet this requirement, which not only wastes energy, but also reduces the steam entering the steam turbine. The steam flow for doing work reduces the output of the unit and increases the unit coal consumption of the power plant

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