Device and method for secondary spraying deep emission reduction, waste heat utilization and flue gas water collection in desulfurization tower
A desulfurization tower and flue gas technology, applied in the field of flue gas desulfurization, can solve the problems of low investment cost performance, low cooling environment benefits, and increased system resistance, reduce the height required for spraying, avoid environmental protection exceeding the standard, and improve processing capacity Effect
Pending Publication Date: 2022-07-29
SHANXI ZHANGSHAN POWER GENERATION +1
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Problems solved by technology
However, since the system requires a separate spray cooling tower after the desulfurization tower, the system is complex and difficult to apply to engineering examples
The spray system can also be arranged on the upper part of the desulfurization tower, but at present, the water collection device and the demister are arranged separately, resulting in a large increase in system resistance
The environmental benefits of simple direct spray cooling are very low, and the investment cost performance is not high
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[0034] The present invention will be further described with reference to the accompanying drawings.
[0035] A method for deep emission reduction, waste heat utilization, and flue gas collection in a desulfurization tower by secondary spraying The spray liquid is collected. The vertical pipe self-cleaning tank is thin and tubular, occupies a small area, and has a self-cleaning structure design inside. , to realize the cascade utilization of flue gas recovery moisture. A pipeline heat exchanger is installed at the outlet of the secondary spray circulating pump to cool the spray liquid, recover the heat in the spray liquid (ie the heat in the flue gas), and at the same time recover the moisture in the flue gas. The pump outlet is also connected to a sodium carbonate (sodium bicarbonate) dosing device, which can quickly improve the processing capacity of the desulfurization system. The water quality of the secondary spray system is good, and it can effectively treat unconventio...
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The invention aims to provide a device and a method for secondary spraying deep emission reduction, waste heat utilization and flue gas water collection in a desulfurizing tower, and belongs to the technical field of flue gas desulfurization. Liquid of an original spraying system and liquid of a secondary spraying system are separated through a demisting and liquid collecting integrated device, spraying liquid is collected through a vertical pipe self-cleaning tank, and the secondary spraying system is used for secondary spraying. The vertical pipe self-purification tank is in a thin and high pipe shape, occupies a small area, is internally provided with a self-purification structure design, is divided into a high-turbidity area, a turn-back area and a low-turbidity area, and is provided with a corresponding solid content meter, so that gradient utilization of water recovered from flue gas is realized. A pipeline heat exchanger is installed at an outlet of the secondary spraying circulating pump and used for cooling spraying liquid, recycling heat in the spraying liquid (namely heat in the smoke) and recycling water in the smoke at the same time. A pump outlet is further connected with a sodium carbonate (sodium bicarbonate) dosing device, and the treatment capacity of the desulfurization system can be rapidly improved. The secondary spraying system is good in water quality, and unconventional pollutants can be effectively treated.
Description
technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a device and a method for deep emission reduction by secondary spraying in a desulfurization tower, utilization of waste heat, and water collection from flue gas. Background technique [0002] Limestone / gypsum wet flue gas desulfurization is the most commonly used desulfurization process for coal-fired power station boilers and industrial boilers, and the application ratio exceeds 90%. The basic process is to let the flue gas pass through the absorption tower, and multiple spray layers are used to spray the flue gas in the absorption tower to capture sulfur dioxide and other acid gases and dust in the flue gas. In the wet desulfurization process, a large amount of liquid condensate appears at the exit of the chimney, forming a "wet plume". It will cause certain visual pollution to the surrounding environment, affect the local image of the enterprise,...
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IPC IPC(8): B01D53/79B01D53/50B01D53/34
CPCB01D53/79B01D53/50B01D53/343
Inventor 景杰
Owner SHANXI ZHANGSHAN POWER GENERATION