Device for preventing ash from being accumulated in rear smoke channel of coal-fired boiler subjected to denitration transformation

Abstract

The invention discloses a device for preventing ash from being accumulated in a rear smoke channel of a coal-fired boiler subjected to denitration transformation. The device comprises an economizer outlet vertical smoke channel, an air supply pipeline, a hot primary air pipe, an air preheater and an ash bucket arranged at the tail end of the economizer outlet vertical smoke channel. The hot primary air pipe is externally connected with a bypass air channel, and the bypass air channel communicates with the economizer outlet vertical smoke channel through the air supply pipeline. The hot primaryair pipe and an inlet smoke channel are connected with the air preheater. According to the device, the hot primary air pipe on an outlet of the air preheater is externally connected with the bypass air pipeline, hot primary air is sprayed in through a rectangular spraying opening of a smoke channel at the position, prone to ash accumulation, of an outlet of an economizer, the gas flow speed of adry loose ash accumulating area can be increased due to the sprayed hot primary air, gas force carries dry ash to the ash bucket on a subsequent smoke channel, and therefore ash accumulation on a bendbetween the vertical section of the outlet of the economizer and the horizontal section can be avoided. The device is small in structural size, can be easily mounted in narrow space, and is safe andreliable in performance and small in construction amount and investment.

Description

technical field [0001] The invention belongs to the technical field of boilers, and in particular relates to a device for preventing ash accumulation in the tail flue of a coal-fired boiler after denitrification transformation. Background technique [0002] The current coal-fired units in service are to ensure the NO x The discharge meets the national environmental protection standard, and the technical means of adding a denitrification device to the tail flue of the boiler is basically adopted. However, since the layout space of the denitrification device was not considered in the initial design of the active units, a long horizontal straight pipe flue is generally arranged at the outlet of the economizer when the denitrification transformation is carried out, and then the flue turns to a certain height before entering the denitrification device . The inlet of the denitration device is generally more than 10m higher than the horizontal straight pipe section, so when the a...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a device for preventing ash accumulation in the tail flue of a coal-fired boiler after denitrification transformation. The problem of a lot of dust accumulation at the bend of the horizontal section

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