Flue gas bypass system with Pi-shaped boiler participating in peak regulation

Abstract

The invention discloses a flue gas bypass system with a Pi-shaped boiler participating in peak regulation. A flue gas bypass is additionally arranged on a flue in front of a furnace arch of the Pi-shaped boiler and behind a coal economizer, the flue gas bypass system comprises a furnace smoke exhaust port formed in the upstream side of the furnace arch of a main flue, a bypass flue is in an L shape, a smoke one-way regulating valve, a smoke flow monitoring device and a smoke temperature monitoring device are arranged on a horizontal section at the upper end of the bypass flue, a booster fan is arranged at the lower end of the bypass flue, and a boiler smoke outlet is formed in the tail portion of the bypass flue and connected with a boiler main flue behind the coil economizer. According to the flue gas bypass system, the problems of slow temperature rise of the tail flue and low ammonia spraying smoke temperature during starting and stopping of the Pi-shaped boiler can be effectively solved, the problems of unstable combustion state and excessive NOx emission of the boiler when the boiler participates in peak regulation can be effectively solved, coal consumption is reduced, and the flexibility of a thermal power generating unit participating in peak regulation is improved.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to a flue gas bypass system for a Π-type boiler participating in peak regulation. Background technique [0002] In recent years, the proportion of new energy power generation has increased year by year, and the operating environment of thermal power units has become more and more changeable, and will mainly participate in the operation as peak-shaving units. For most power plants, on the premise of ensuring equipment safety, how to make the boiler NO x The emission meets the environmental protection index, and the inlet flue temperature of the denitrification system meets the minimum flue temperature requirement for ammonia injection when the boiler starts and stops, which has become the focus of research at this stage. If the above-mentioned related problems can be effectively solved, the flexibility of the thermal power unit to participate in peak regulation can be ef...

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Problems solved by technology

[0003] In order to overcome the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a flue gas bypass system for Π-type boilers participating in peak regulation, which can effectively solve the problem of slow temperature rise in the tail flue and ammonia smoke spraying when the Π-type boiler is started and stopped. The problem of low temperature, and when the boiler participates in peak shaving, the combustion state is unstable, and the boiler NO x To solve the problem of excessive emissions, reduce coal consumption, and improve the flexibility of thermal power units to participate in peak regulation

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