Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling

Abstract

The invention relates to a fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling. The system is further provided with a steam exhaust separator, a pulverized fuel feeder and a coal-dust mixer in sequence between a tailing separator and a coal-dust distributor; the upper part of the steam exhaust separator is provided with a steam exhaust outlet; the steam exhaust outlet is communicated with a steam exhaust filter; the coal outlet of the steam exhaust filter is communicated with the pulverized fuel feeder; the air outlet of the steam exhaust separator is communicated with a steam exhaust fan; the steam exhaust fan is then communicated with a desulfurizing tower; and an air preheater is further communicated with the coal dust mixer. The system has the advantages of improving the burn-up quality of brown coal and the thermal efficiency of fuel coal, and as drying, pulverizing, upgrading, water conservation and storage of the brown coal are combined, the coal consumption of power generation can be reduced, and a large amount of water in the brown coal can be recycled.

Description

technical field [0001] The invention belongs to the technical field of coal power generation, and relates to lignite power generation technology, specifically, to a lignite drying and pulverizing system. Background technique [0002] Lignite, also known as charcoal, is mostly brown or brown-black. It is a kind of high volatile content (about 50%), high moisture content (25%-60%), high ash content (about 30%), low calorific value (about 3200kcal / kg), low ash melting point, easy to weather and fragment, easy to oxidize and spontaneously combust, and it is the mineral coal with the lowest degree of coalification. Lignite is mainly used as fuel in power plants, and can also be used as chemical raw materials, catalyst carriers, adsorbents, sewage purification and metal recovery. Due to the limitations of natural properties and technical processes, the main problems in the mining and utilization of lignite include: (1) low calorific value and limited use. Building coal power bas...

AI Technical Summary

Problems solved by technology

Due to the limitations of natural properties and technical processes, the main problems in the mining and utilization of lignite include: (1) low calorific value and limited use

2) Blending cold flue gas can ensure that the CO in the desiccant of the pulverizing system 2 The content is greater than 4%, but due to factors such as air leakage in the pipeline, the pulverizing system is often in danger of explosion

The upgrading of lignite also brings a lot of problems such as storage, packaging, transportation, spontaneous combustion, and environmental pollution after lignite upgrading, and the investment is huge

Moreover, it failed to coordinate with the lignite pulverization system of the power plant, which made various lignite upgrading technologies costly and failed to be popularized and applied.

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