Device and method for increasing capacity and improving efficiency of coal mill based on lignite

Abstract

The invention relates to the technical field of coal pulverizing by a coal mill for co-firing of lignite in a thermal power plant, in particular to a device and method for increasing capacity and improving efficiency of a coal mill based on lignite. According to the device for increasing the capacity and improving the efficiency of the coal mill, a high temperature superheated steam pipeline led from a steam turbine is connected with a steam heat exchanger; the steam heat exchanger is connected with a coal mill primary air chamber through an inlet primary air duct; the steam heat exchanger isconnected with a high pressure heater III through a pipeline; and a primary draught fan is connected with the steam heat exchanger through a hot primary air pipeline. According to the device and method for increasing the capacity and improving the efficiency of the coal mill based on the lignite, the adaptability to coal types and output of the coal mill are improved, the proportion of lignite mixed combustion is effectively increased, and the combustion performance of a boiler basically keeps unchanged. The technical scheme of adding hot primary air at an inlet of the coal mill solves the technical problems of insufficient output of the coal mill and low combustion efficiency of the boiler. According to the device and method for increasing the capacity and improving the efficiency of thecoal mill based on the lignite, the application scope of the lignite is expanded, thus any power plant can have the ability of burning the lignite, and the operation cost of an enterprise is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of pulverization of coal pulverizers for co-burning lignite in thermal power plants, in particular to a lignite-based coal pulverizer capacity-increasing device and a method thereof. Background technique [0002] In order to protect limited natural resources and save power generation costs of thermal power plants, the current situation of thermal power plants requires the active use of low-quality coal, and the blending of lignite and coal slime in coal combustion. At present, my country's proven lignite reserves are as high as 16% of the total reserves. The characteristics of high reserves and low cost make many thermal power plants begin to require blending lignite. [0003] Because lignite has the characteristics of high moisture and low calorie, a lot of imported lignite is applied to the existing coal mill, which has problems such as low efficiency and insufficient grinding output. [0004] Under high ...

AI Technical Summary

Problems solved by technology

The invention solves the problems of insufficient output of the coal mill and low combustion efficiency of the boiler by increasing the primary air temperature at the inlet of the coal mill during the process of co-burning lignite

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