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

A technology of denitrification transformation and tail flue, which is applied in the direction of combustion air/fuel supply, combustion method, combustion control, etc., can solve the problem of excessive ash accumulation in the vertical section of the boiler economizer outlet when it turns to the horizontal section, and achieves The construction volume and investment are small, the structure is simple, and the effect of small device structure size

Pending Publication Date: 2018-06-29
XIAN XIRE ENERGY SAVING TECH
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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 accumulati

Method used

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

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Embodiment Construction

[0017] The present invention is described in further detail below in conjunction with accompanying drawing:

[0018] see figure 1 , a device for preventing soot accumulation in the tail flue of a coal-fired boiler after denitrification transformation, including an economizer outlet vertical flue 1, an air supply pipe 2, a pneumatic control valve 3, a bypass air duct 4, and a hot primary air duct 5 , Air preheater 6, air preheater inlet flue 7, ash hopper 8 and rectangular spout 9.

[0019] A bypass air duct 4 is externally connected to the hot primary air duct 5, and a pneumatic control valve 3 is arranged on the bypass air duct 4 to regulate the flow of the hot primary air entering the air supply duct 2; Road 1 is close to the horizontal flue, and a row of rectangular nozzles 9 is arranged in the width direction of the furnace. The hot primary air is injected into the corner of the vertical flue to the horizontal flue through the rectangular nozzles, thereby increasing the g...

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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...

Claims

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Application Information

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IPC IPC(8): F23L1/00F23N3/00F23J3/02
CPCF23J3/026F23L1/00F23N3/00Y02E20/34
Inventor 井新经李杨张奔王宏武周元祥王勇周刚
Owner XIAN XIRE ENERGY SAVING TECH
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