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Boiler system for cold flue gas recirculation and cold flue gas recirculation method

A flue gas recirculation and flue gas technology, which is applied to boiler systems with cold flue gas recirculation and the field of cold flue gas recirculation, can solve the problem of high reheater steam temperature, achieve low soot concentration, reduce NOx content, The effect of low flue gas temperature

Inactive Publication Date: 2016-03-09
上海汉鼎环保技术工程有限公司
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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a boiler system with cold flue gas recirculation and a cold flue gas recirculation method, which are used to solve the problem of high steam temperature of the reheater in the prior art

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  • Boiler system for cold flue gas recirculation and cold flue gas recirculation method
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  • Boiler system for cold flue gas recirculation and cold flue gas recirculation method

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[0026] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] see Figure 1 to Figure 2 . It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. The disclosed technical content must be within the scope covered. At the sa...

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Abstract

The invention provides a boiler system for cold flue gas recirculation and a cold flue gas recirculation method. The boiler system for cold flue gas recirculation comprises collection pipes communicated with a de-duster outlet and used for collecting cold flue gas, a concentration pipe connected with the collection pipes and a guide pipe connected with the concentration pipe and used for conveying cold flue gas into a boiler body. The boiler system for cold flue gas recirculation and the cold flue gas recirculation method have following beneficial effects: by adopting cold flue gas behind the de-duster as circulation flue gas, flue gas can be directly and conveyed to the boiler body after pressure rise in an induced draft fan due to low flue gas temperature and low smoke concentration behind the de-duster; by adjusting the boiler and then increasing steam temperature, coking is prevented; temperature of a heating surface pipe wall is decreased; and content of NOx is reduced.

Description

technical field [0001] The invention relates to a flue gas recirculation system, in particular to a boiler system with cold flue gas recirculation and a cold flue gas recirculation method. Background technique [0002] The current flue gas recirculation is to send the flue gas from the shaft at the tail of the boiler body into the boiler, which belongs to the flue gas recirculation of the boiler body with high ash content and high flue temperature. Generally, the flue gas at the outlet of the boiler economizer 9 is collected, such as figure 1 As shown, the smoke concentration here is often 40g / m 3 Around, the temperature of the flue gas is 400°C-450°C. Due to the high flue temperature, especially the high concentration of flue dust, the recirculation fan can only be used for a short period of time. Because it cannot be used normally for a long time, there are few people who use this flue gas circulation at present. Boilers, flue gas recirculation leading to such high tempe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G5/06
Inventor 曹汉鼎
Owner 上海汉鼎环保技术工程有限公司
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