Water-tube boiler achieving internal circulation of flue gas and low-nitrogen combustion control method

A water tube boiler and internal circulation technology, applied in the boiler field, can solve the problems of increasing the load of the induced draft fan, complicated control, increased investment and energy consumption, etc., to reduce the generation of nitrogen oxides, the system and control are simple, and the combustion stability Good results

Active Publication Date: 2016-04-13
QINGDAO QUANNENG ENERGY SAVING ENVIRONMENTAL PROTECTION BOILER CO LTD
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Problems solved by technology

This flue gas recirculation method increases the flue gas volume of the system due to the introduction of a large amount of low-temperature flue gas, which leads to an increase in the flue gas f...

Method used

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  • Water-tube boiler achieving internal circulation of flue gas and low-nitrogen combustion control method
  • Water-tube boiler achieving internal circulation of flue gas and low-nitrogen combustion control method
  • Water-tube boiler achieving internal circulation of flue gas and low-nitrogen combustion control method

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0020] Such as figure 1 and figure 2 As shown, the flue gas internal circulation water tube boiler includes a furnace wall 1 and a furnace 2 for fuel combustion formed by the furnace wall 1. The furnace is in the form of an annular water-cooled jacket structure. The furnace 2 and the burner outlet 3 The side wall of the furnace 2 is equipped with an outer water-cooled wall 4, and the inner water-cooled wall 5 correspo...

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Abstract

The invention relates to the technical field of boilers, in particular to a water-tube boiler achieving internal circulation of flue gas and a low-nitrogen combustion control method. The water-tube boiler achieving internal circulation of the flue gas comprises a boiler wall and a boiler chamber which is communicated with an outlet of a combustor, an outer side water-cooling wall is installed on the side wall of the boiler chamber, an inner side water-cooling wall is installed in the boiler chamber, and a water-cooling interlayer is formed between the outer side water-cooling wall and the inner side water-cooling wall; a flue gas backflow inlet is formed in the end, far away from the outlet of the combustor, of the water-cooling interlayer, and a lower-temperature flue gas backflow outlet is formed in the end, close to the outlet of the combustor, of the water-cooling interlayer; a low-temperature flue gas backflow zone is formed by the water-cooling interlayer, and a high-temperature flue gas radiation zone is formed by the portion, located on the inner side of the inner side water-cooling wall, of the boiler chamber. According to the water-tube boiler achieving internal circulation of the flue gas and the low-nitrogen combustion control method, by means of the circulation mode of flue gas in the boiler chamber, decreasing of combustion temperature is facilitated, generation of nitrogen oxides is reduced, the load of an induced draft fan cannot be increased, the system is easy to control, and combustion stability is good.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a flue gas internal circulation water tube boiler and a low-nitrogen combustion control method. Background technique [0002] During the combustion of fuel, nitrogen oxides are one of the products of combustion. Generally, the nitrogen oxides produced by combustion come from two aspects: one is the oxidation of nitrogen in the air required for combustion; the other is the nitrogen oxides contained in fuel during the combustion process. decomposed and oxidized continuously. Nitrogen oxides are extremely harmful to the environment and human health. It is a major issue facing the development of boiler technology to take technical measures to reduce the formation of nitrogen oxides and reduce the emission of nitrogen oxides. [0003] In the prior art, such technical measures are divided into two categories: one is denitrification in the furnace, and the other is denitrification at t...

Claims

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Application Information

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IPC IPC(8): F24H1/24F23N5/00
CPCF23N5/00F24H1/24
Inventor 张青张世仓
Owner QINGDAO QUANNENG ENERGY SAVING ENVIRONMENTAL PROTECTION BOILER CO LTD
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