Integrated pulverized coal separation and concentration device of pulverized-coal boiler

Abstract

The invention relates to an integrated pulverized coal separation and concentration device of a pulverized-coal boiler, which comprises an axial type coarse pulverized coal separator of which the bottom is connected with a coal mill (1) by a pulverized coal return pipe (16) and the top is connected with a tangential extraction axial type pulverized coal concentrator; the coarse pulverized coal separator comprises an inlet section (2), a closed inner cylinder body (6) provided with a circular truncated cone bottom (4), a shell (3), a ring-shaped diversion ring (5) and an axial blade (7) of the coarse pulverized coal separator; an outlet on the top of the coarse pulverized coal separator is a tapered necking hole (8); the pulverized coal concentrator comprises a cylindrical shell (9), a pulverized coal concentrator swirl stabilizer (11) provided with a straightening vane (10), an internal inserting type exhaust gas lead-out circular tube (12) and an exhaust gas outlet circular tube (14) which are connected together into a whole, a hot air inlet (15) and a concentration outlet (13); and pulverized coal air flow which has high oxygen quantity and concentration and is formed by mixing hot air coming from the hot air inlet with the pulverized coal coming from the concentration outlet at the end of the concentration outlet is filled into a primary air flow pipeline of the boiler. The invention realizes pulverized coal separation and concentration with high performance and low resistance, and has the advantages of being high in pulverization output, low in pulverization electricity consumption, fine in pulverized coal, good in pulverized coal uniformity, excellent in concentration performance, flexible in adjustment, etc.

Description

technical field

[0001] The invention belongs to the field of equipment related to thermal power engineering, and in particular relates to a pulverized-coal boiler that burns high-moisture lignite (the coal-fired base moisture is ≥ 40%) and integrates the pulverized coal separation of the pulverizing system and the pulverized coal concentration function of the combustion system. installation. Background technique

[0002] The burial age of lignite is about 15,000 to 40,000 years. According to its geological burial age and carbonization degree, it can be divided into young lignite and old lignite. Aged lignite has deep carbonization degree, compact structure and dark brown appearance. Its calorific value and carbon content are relatively high. The moisture content of the as-received base is generally below 35%, and the volatile content of the dry and ash-free base is generally 40% to 50%. %, the low calorific value on the basis of receipt is between 10MJ / kg and 16MJ / kg. Youn...

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