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Air preheater cold end comprehensive temperature control method and system and air preheater

An air preheater and temperature detector technology, applied in the field of air preheater and air preheater cold end comprehensive temperature control, can solve problems such as low temperature corrosion, and achieve the effect of reducing the risk of low temperature corrosion

Active Publication Date: 2017-07-18
SHANDONG ZHONGSHI YITONG GRP
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Problems solved by technology

Since the air temperature at the inlet of the air preheater is low and the temperature of the flue gas in the area of ​​the air preheater is not high, the temperature of the metal near the air preheater is often lower than the dew point of the flue gas. It will condense on the heating surface of the air preheater and the tail flue, causing low-temperature corrosion. At present, power stations equipped with air preheaters have not specified a corresponding solution for this defect

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  • Air preheater cold end comprehensive temperature control method and system and air preheater

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0027] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention relates to an Air preheater cold end comprehensive temperature control method and system and an air preheater. The method comprises the following steps that the exhaust gas temperature and secondary air inlet temperature of the air preheater are detected in real time; the cold end comprehensive temperature of the air preheater is calculated according to the exhaust gas temperature and the secondary air inlet temperature; and the cold end comprehensive temperature of the air preheater is compared with set temperature, the secondary air inlet temperature is adjusted according to the comparison result, and automatic control over the cold end comprehensive temperature of the air preheater is achieved. According to the technical scheme, when the air preheater operates nromallhy, the cold end comprehensive temperature is kept at the set temperature for running under all load working conditions, the exhaust gas temperature changes along with changes of unit loads, and automatic control over the cold end comprehensive temperature is achieved; and the cold end comprehensive temperature of the air preheater is within the economical and safe range, the risk of low temperature corrosion of a unit can be reduced, and the unit operates safe, stably and economically.

Description

technical field [0001] The invention relates to a comprehensive temperature control method and system at the cold end of an air preheater and the air preheater. Background technique [0002] At present, large-scale power stations are equipped with air preheaters. Air preheaters are the heating surfaces where the flue gas in the flue at the tail of the boiler passes through the internal cooling fins to preheat the air before entering the boiler to a certain temperature. Exchange performance, reduce energy consumption. Since the air temperature at the inlet of the air preheater is low and the temperature of the flue gas in the area of ​​the air preheater is not high, the temperature of the metal near the air preheater is often lower than the dew point of the flue gas. It will condense on the heating surface of the air preheater and the tail flue, causing low-temperature corrosion. At present, power stations equipped with air preheaters have not specified a corresponding solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F27/00F23L15/00
CPCF23L15/00F28F27/00Y02E20/34
Inventor 刘希健杨锋孙鑫郭鲁阳申旭张鹏李蕾张善鹏部俊峰
Owner SHANDONG ZHONGSHI YITONG GRP
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