Supercritical cfb boiler power failure protection device
A power failure protection and supercritical technology, applied in the field of boiler combustion, can solve the problems of insufficient cooling technology, damage to the boiler, complicated operation, etc., and achieve good cooling and cooling effects, water saving and rapid cooling
Active Publication Date: 2018-07-17
NORTH CHINA POWER ENG
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Problems solved by technology
[0008] The problem to be solved by the present invention is: when the existing CFB boiler is in the power-off state, the high-temperature material in the furnace will continue to release heat, which will damage the boiler. The existing cooling technology is not fast enough, the operation is complicated, and the cost is high.
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[0055] Such as figure 1 and figure 2 Shown is the overall system flow chart of the power failure protection device of the supercritical CFB boiler of the present invention and the furnace roof part structural schematic diagram of the power failure protection device. The overall design concept of the present invention is to quickly reduce the heat release of the combustion materials in the furnace in the state of power failure. On the one hand, a large number of cooling solid particles are used to cover the combustion materials in the furnace to cool down and prevent the boiler from being damaged by high temperature; on the other hand On the one hand, the water circulation is used to drive the water in the lower header of the water wall at the bottom of the furnace to exchange heat for cooling.
[0056] The powder material covering device is a powder material bin 1 and a pneumatic gate valve 3, the pneumatic gate valve 3 is a power-off opening device for the powder material b...
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The invention relates to a power loss protection device for a supercritical CFB boiler. The power loss protection device comprises the CFB boiler. A water cooling wall lower collection box is arranged in the CFB boiler. The power loss protection device is characterized in that a powder bin is arranged above a hearth of the CFB boiler, during power losses, cooling powder is scattered into the hearth through the powder bin, the water cooling wall lower collection box is connected with a power loss emergency pump system, and the other end of the power loss emergency pump system is connected with a deaerator water tank; and during power losses, a water cooling wall gets water from the deaerator water tank for cooling. According to the power loss protection device, solid particles are sprayed from the boiler top to cover high-temperature materials, so that cooling is achieved, it can be guaranteed that the CFB boiler is protected in time under the situation of power failures, damage to the boiler from the excessively high temperature in the boiler is prevented, and cooling is fast and efficient.
Description
technical field [0001] The invention relates to the field of boiler combustion, in particular to protecting the pressurized parts of a steam-water system after a supercritical CFB boiler loses power, so as to prevent metal wall temperature from overheating and damage. Background technique [0002] After a power plant equipped with a supercritical CFB boiler (circulating fluidized bed, CFB boiler is what we usually call a circulating fluidized bed boiler) loses power, due to the large amount of high-temperature materials remaining in the furnace and the laying of refractory and wear-resistant materials will continue to discharge Therefore, it is necessary to protect its pressure-bearing parts, especially the heat-absorbing and easy-to-overheat heating surfaces. [0003] According to the requirements of the boiler factory, the use of steam to cool the pressurized parts must meet the following requirements: [0004] 1) In the first 20 minutes after the shutdown of the furnace,...
Claims
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IPC IPC(8): F23C10/18
Inventor 李仁
Owner NORTH CHINA POWER ENG