Supercritical circulating fluidized bed boiler water wall with 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 burned 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: 2017-07-28
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology

[0012] 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

Method used

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  • Supercritical circulating fluidized bed boiler water wall with high flow stability under low load
  • Supercritical circulating fluidized bed boiler water wall with high flow stability under low load

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Embodiment Construction

[0039] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0040] The method for realizing the low mass flow rate of the water wall of the supercritical CFB boiler is as follows:

[0041] First, according to the steam flow (T) and fuel of the CFB boiler, 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 velocity in the furnace: the main element carbon in the fuel (C) Combustion of hydrogen (H) and sulfur (S) will release heat and also produce smoke. The amount of heat released and the amount of smoke produced can be known from known chemical knowledge. According to the heat balance that steam needs to absorb and the heat generated by fuel combustion, the flue gas flow Q can be calculated. The choice of flue gas flow rate in the furnace is generally V=4-6m / s.Q / V=S, S is the cross-sectional area...

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Abstract

A water wall of a supercritical circulating fluidized bed boiler having high flow stability at a low load, and method of providing a low mass flow rate. The circulating fluidized bed boiler comprises a surrounding water wall (11) and a mid-partition water wall (17) of a furnace (1) having a low mass flow rate, and a working medium flows in the surrounding water wall (11) and the mid-partition water wall (17) connected in parallel. Tubes of the surrounding water wall (11) and the mid-partition water wall (17) have a greater inner diameter at locations having a steam content greater than 50% than locations having a steam content less than 50%, and the portion of the tubes having the greater inner diameter has a cross section area 1.05-3 times of a cross section area of the portion of the tubes having the smaller inner diameter. The water wall of the supercritical circulating fluidized bed boiler realizes a low mass flow rate, and addresses the problems of an increased water wall area and furnace height when the mass flow rate is low. In addition, the water wall of the supercritical circulating fluidized bed boiler addresses the problem of lower flow stability at a low load, thus preventing a negative feedback from happening in a water wall system.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a circulating fluidized bed boiler water wall system with supercritical parameters. Background technique [0002] Supercritical boiler generator sets can obtain higher power generation efficiency. 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°C). 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 composed of steam drum-downcomer-water wall-steam drum used in boilers below the subcritical parameters cannot be used. . The supercritical boiler water wall system adopts a once-through boiler, that is, the working fluid (water or steam) in the water wall passes through the water wall once. The mass flow rate of...

Claims

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Application Information

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Patent Type & Authority Patents(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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