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Supercritical circulating fluid bed boiler water wall having high flow stability under low load

A circulating fluidized bed and water-cooled wall technology, which is applied to boiler water pipes, fluidized bed combustion equipment, and fuel burning in a molten state, can solve the problems of decreased flow stability, increased water-cooled wall area and furnace height, etc., to prevent The effect of negative feedback

Active Publication Date: 2016-02-03
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology

[0011] Purpose of the present invention: supercritical CFB boiler water wall realizes low mass flow rate, solves the problem of increasing water wall area and furnace height under low mass flow rate at the same time; Decrease in stability and prevent negative feedback of the water wall system

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  • Supercritical circulating fluid bed boiler water wall having high flow stability under low load
  • Supercritical circulating fluid bed boiler water wall having high flow stability under low load

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Embodiment Construction

[0038] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0039] The method for realizing low mass flow rate in the water wall of supercritical CFB boiler, the steps are:

[0040] First, according to the steam flow (T) of the CFB boiler and the fuel, the flue gas flow (Q) generated by combustion is calculated, and then the cross-sectional area of ​​the furnace is obtained from the flue gas flow and the flue gas flow rate in the furnace: the main element carbon in the fuel (C) The combustion of hydrogen (H) sulfur (S) emits heat and also generates flue gas. The amount of heat released and the amount of flue gas generated can be known from known chemical knowledge. The flue gas flow Q can be calculated according to the balance of the heat that the steam needs to absorb and the heat generated by the combustion of the fuel. The choice of flue gas flow rate in the furnace is generally V=4-6m / s. Q / V=S, S is the ...

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Abstract

The invention discloses a method enabling a supercritical circulating fluid bed (CFB) boiler water wall to realize low mass velocity and a low-mass-velocity supercritical CFB boiler water wall having high flow stability under low load and relates to a circulating fluid bed boiler. The circulating fluid bed boiler comprises a low-mass-velocity hearth circumferential water wall and a water partition board, and the flow of a working medium is associated on the circumferential water wall and the water partition board. The inner diameters of, positions that the steam ratio is larger than 50%, of pipes of the hearth circumferential water wall and the water partition board are larger than the inner diameters of the pipes in lower positions, and the cross section of the large inner diameter parts of the pipes is 1.05 to 3 times of that of the small inner diameter parts. The supercritical CFB boiler water wall realizes low mass velocity, and meanwhile, the problem that water wall area and hearth height are increased at low mass velocity is solved. Particularly, the problem that the flow stability of the low-mass-velocity supercritical CFB boiler water wall declines under low load is solved, and the negative feedback of the water wall system is prevented from occurring.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler water cooling wall system with supercritical parameters. Background technique [0002] The supercritical boiler generator set can obtain higher power generation efficiency. The supercritical circulating fluidized bed boiler means that the pressure and temperature of the steam output by the boiler are higher than the critical parameters of water steam (22.12MPa, 374.15℃). However, in the supercritical state, there is no difference in physical parameters between water and steam, so the natural circulation (or forced circulation) water wall system consisting of steam drum-downcomer-water wall-steam drum used in boilers below subcritical parameters cannot be used. . The supercritical boiler water-cooled wall system adopts a once-through boiler, that is, the working fluid (water or water vapor) in the water-cooled wall passes through the water-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18
CPCF22B37/10
Inventor 徐鹏胡修奎巩李明陈震宇苏虎杨雪芬薛大勇聂立薛燕辉王鹏
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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