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Method for calculating heating surface of power station boiler steam temperature overheating or insufficient temperature

A technology of power station boiler and calculation method, which is applied in steam generation, lighting and heating equipment, control system, etc., can solve the problems of under-temperature and over-temperature of steam temperature of power station boiler.

Inactive Publication Date: 2009-12-09
上海汉鼎环保技术工程有限公司
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a calculation method for the heating surface of a power plant boiler, so as to overcome the defects of overheating or underheating of the steam temperature of the power plant boiler caused by the existing calculation method

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  • Method for calculating heating surface of power station boiler steam temperature overheating or insufficient temperature
  • Method for calculating heating surface of power station boiler steam temperature overheating or insufficient temperature
  • Method for calculating heating surface of power station boiler steam temperature overheating or insufficient temperature

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Embodiment Construction

[0045] In order to prevent the overheating or underheating of the steam temperature of the utility boiler, it is necessary to calculate the heating surface that meets the requirements, that is, the area occupied by the water wall of the furnace F l .

[0046] Such as figure 1 , B1: First, select the flue gas temperature T at the furnace outlet according to the furnace type l ″, and calculate the furnace outlet flue gas enthalpy I l ";

[0047] B2: Set the geometric characteristic coefficient of the furnace M=1.5, and the state characteristic coefficient of the heat absorption capacity of the furnace ζ=1;

[0048] B3: Due to the calculation of the amount of fuel Bj (unit t / h), the effective calorific value of the furnace Q l (unit: kcal / kg), furnace blackness a l , black body radiation coefficient σ o =4.9×10 -8 (kcal / m 2 When·K 4 ), calculate the heat absorption capacity of the furnace water wall ψ l0 pj Taking conventional values, these boiler design parameters or ...

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Abstract

The invention discloses a heating surface calculation method for solving the problem of overheating or underheating of the steam temperature of a power plant boiler, which comprises the following steps: according to the selected furnace outlet flue temperature Tl" and other known parameters, the geometric characteristic coefficient M of the furnace is set and The initial value of the state characteristic coefficient ζ of the heat absorption capacity of the furnace, calculate the occupied area Fl of the furnace water wall and the characteristic value of the comprehensive factor β, then calculate M according to the formula (see the formula on the right below), and then calculate ζ, according to the calculated M, ζ, Recalculate Fl, if the difference between the Fl values ​​calculated twice adjacently is large, use the new Fl value to recalculate β, M, ζ, Fl until the Fl values ​​calculated twice adjacently are close enough, that is The furnace water-cooled wall that meets the requirements occupies an area Fl.

Description

technical field [0001] The invention relates to a furnace heat transfer calculation method of a utility boiler. Background technique [0002] The heat transfer calculation of the boiler furnace in our country has been using the calculation method of the former Soviet Union. This method does not consider the influence of the furnace geometry on the heat transfer in the furnace. Since the development of power plant boilers to large capacity, both domestic and former Soviet Union large capacity boilers have produced a series of high and low steam temperature problems. This is due to the fact that with the increase of capacity, the change of coal type and other specific requirements of the power plant boiler, the geometry of the furnace has exceeded the conventional range, and a large change has occurred, becoming thin or short. , the heating surface of the boiler designed by the original calculation method, that is, the occupied area Fl of the furnace water-cooled wall, is di...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B35/00
Inventor 曹汉鼎顾恬林碧玉熊显巍朱秀芬肖华陶丽朱智士李永德杨大卫周奎应刘恩生王兴钦刘国栋吴萍胡兴胜吴安
Owner 上海汉鼎环保技术工程有限公司
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