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Effect evaluation method for secondary air bellow flow field of opposed coal-fired boiler

A technology of secondary air box and evaluation method, which is applied to combustion equipment, testing of machinery/structural components, measurement devices, etc., can solve the problem of insufficient stability of combustion optimization effect, and achieve the effect of enriching evaluation methods.

Active Publication Date: 2020-06-16
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, since the combustion process in the furnace is a dynamic process, it is greatly affected by the type of coal, the contamination in the furnace, etc., and the stability of the combustion optimization effect is not enough.

Method used

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  • Effect evaluation method for secondary air bellow flow field of opposed coal-fired boiler
  • Effect evaluation method for secondary air bellow flow field of opposed coal-fired boiler
  • Effect evaluation method for secondary air bellow flow field of opposed coal-fired boiler

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Experimental program
Comparison scheme
Effect test

Embodiment

[0085] After a one million hedge coal-fired boiler implemented a secondary air box modification for over-temperature tube wall and high-temperature water wall corrosion, the data comparison before and after the modification is shown in Table 1 to Table 2.

[0086] Table 1 Statistics of measured cross-section wind speed under the original air duct layout:

[0087]

[0088] The numerical simulation results show that the flow field distribution of the secondary air volume measurement section on the A / B side under the original air duct layout is extremely uneven, the relative standard deviation of the velocity distribution is 36% (average velocity is 18.27m / s), and the section appears Obvious separation of fast and slow.

[0089] Table 2 Measured cross-section wind speed statistics after optimization:

[0090]

[0091] The flow field optimization results show that the uniformity of the flow field distribution of the total secondary air volume measurement section on the A / B side is signifi...

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Abstract

The invention relates to an effect evaluation method for a secondary air bellow flow field of a opposite coal-fired boiler after transformation. The method comprises the following steps: in a thermalstate, testing the relative standard deviation of section velocity field distribution at a pre-mounted measuring hole section before and after transformation; testing the pipe wall temperature of a main heating surface before and after transformation, and forming a comparison distribution diagram; testing flue gas components of the outlet section of an economizer before and after transformation, and forming a contrast distribution diagram; and testing the reducing atmosphere of a water-cooled wall surface in a furnace before and after transformation. The uniformity of the pipe wall temperatureis judged by adopting the distribution curve of the pipe wall temperature; the corrosion degree is judged by checking the thickness of the pipe wall and the reducing atmosphere of the water-cooled wall in the furnace in the hot state when the furnace is shut down; the uniformity of the flow field is judged by adopting the temperature and speed distribution relative standard deviation, reference is provided for the evaluation method of the secondary air bellow flow field of the same type of unit after transformation, and the original evaluation method is enriched.

Description

Technical field [0001] The invention relates to the field of boiler transformation, in particular to an effect evaluation method after the transformation of the flow field of the secondary wind box of a hedge coal-fired boiler. Background technique [0002] With the gradual improvement of unit parameters, especially the unit whose hot reheat steam temperature is increased to 620℃, the problems of over-temperature tube wall explosion and high temperature corrosion in the furnace under various loads are particularly prominent, which has also attracted widespread attention. Research on the material analysis of the tube burst on the heating surface shows that in addition to the performance of the tube itself and the welding process, the tube wall overtemperature is also an important inducement. Therefore, it is particularly important to strengthen the monitoring of tube wall temperature. Several major boiler plants have adopted the method of adding online temperature measurement poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00F23C7/00
CPCG01M99/002F23C7/00
Inventor 王小华梅振锋彭小敏陈敏陈宝康薛晓垒俞胜捷刘瑞鹏赵鹏丁奕文
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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