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Low-mass flow rate perpendicular water cooled wall arrangement method

A layout method and water-cooled wall technology, applied in the direction of boiler water pipes, etc., can solve the problem of mismatched distribution of heat absorption and heat flow density, and achieve the effects of reasonable distribution, reduced friction and pressure drop, and convenient installation and maintenance.

Active Publication Date: 2013-09-25
TSINGHUA UNIV
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Problems solved by technology

[0004] Based on the design experience of supercritical ultra-supercritical pulverized coal boilers, the present invention proposes a low-mass flow rate vertical Water wall layout method

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  • Low-mass flow rate perpendicular water cooled wall arrangement method

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Embodiment Construction

[0013] The principle, specific structure and best implementation mode of the present invention will be further described below in conjunction with the accompanying drawings.

[0014] figure 1 It is a schematic diagram of a low mass flow rate vertical water wall arrangement method. It mainly includes a vertical water wall 1 and non-equal-pitch fins 2 . The working fluid enters the water wall from the feed water header of the water wall, heats up in the vertical water wall 1 and absorbs heat, and then is sent to the outlet header of the water wall. In this method, the riser tubes of the water-cooled wall adopt a vertical layout as a whole, and are arranged at non-equal intervals. The space between the riser tubes in the two sides of the low heat flux range of the furnace is relatively large, and the distance between the riser tubes in the middle area of ​​the furnace high heat flux range is relatively small. Small; the distance between each tube is inversely proportional to th...

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Abstract

A low-mass flow rate perpendicular water cooled wall arrangement method belongs to the technical field of boiler design. Water cooled wall ascending tubes are arranged in an unequal interval mode, the distance between the ascending tubes of both-side areas in a furnace-cavity low heat-flow density range is large, the distance between the ascending tubes of the middle area in a furnace-cavity high heat-flow density range is small, and the distance between every two tubes is inversely proportional to heat-flow distribution. Meanwhile, by the adoption of low-mass flow rate, self resistance of the water cooled wall ascending tubes is reduced. By adopting the low-mass flow rate water cooled wall ascending tubes in the unequal interval mode to arrange furnace-cavity heating surfaces, temperature deviation and flow deviation of water cooled wall outlet working media are improved, complexity level of the existing supercritical boiler water cooled wall arrangement mode is greatly decreased, self resistance of the water cooled wall is reduced, overhaul and maintenance is led to be convenient, and simultaneously water power safety can be ensured.

Description

technical field [0001] The invention relates to a method for arranging boiler water cooling walls, which belongs to boiler design technology. Background technique [0002] Supercritical pulverized coal boilers are currently the main unit of thermal power generation. Regardless of whether the four-corner tangential combustion method or the front and rear walls are opposed to the combustion method, there is always an uneven heat load in the furnace, which may easily lead to flow and temperature deviations in the vertical water wall. Serious hydrodynamic accidents such as pipe bursts occur due to partial overheating of the water wall. At present, engineering methods to eliminate temperature deviation generally include: adopting spiral pipe coils, adding throttling pipe coils, etc. The spiral tube coil has the advantages of high space utilization, high heat exchange efficiency, and compact structure, but it also has defects such as high manufacturing cost, high self-resistance,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B37/10
Inventor 张大龙吴玉新吕俊复刘青
Owner TSINGHUA UNIV
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