Air feeding system and method for desulfurizing slurry liquid pre-heating boiler

Abstract

The invention discloses an air feeding system and method for a desulfurizing slurry liquid pre-heating boiler. The air feeding system comprises a desulfurizing tower, a desulfurizing pump, a technological water tank, a demister cleaning pump, an energy-saving pump, a liquid distributor, an air warmer and a liquid returning device, wherein the air warmer comprises an air feeding air channel and an air warming pipe grid; an air inlet of the air feeding air channel communicates with environmental air and an air outlet of the air feeding air channel communicates with a boiler air inlet; a liquid inlet of the energy-saving pump communicates with a desulfurizing slurry chest, and a liquid outlet of the energy-saving pump communicates with a liquid inlet of the liquid returning device; and a liquid outlet of the liquid returning device separately communicates with the desulfurizing slurry chest and a liquid inlet of a gypsum dehydration system. By adopting the system and the method disclosed by the invention, low-grade afterheat in wet-process desulfurizing slurry liquid is effectively recycled, and the recycled afterheat is used for feeding air into the pre-heating boiler, so that the air inlet temperature of the boiler is improved, and the water consumption volume for operation of a wet-process desulfurizing device is reduced while energy consumption of operation of the boiler is reduced at the same time.

Description

technical field [0001] The invention relates to the fields of energy saving and environmental protection, in particular to a system and method for air supply of a desulfurization slurry preheating boiler. Background technique [0002] The industrial production process discharges a large amount of high-temperature flue gas into the environment, and also discharges a large amount of heat into the environment, which is the main reason for the low energy utilization rate. The waste heat recovery and utilization of the high-temperature flue gas emitted by industry and the reduction of the exhaust temperature can not only reduce the energy consumption per unit output value of the industrial production process, but also reduce the emission of pollutants. Coal-fired power plants, industrial boilers, and kilns are the main energy consumption systems in the industrial production process. The recovery and utilization of waste heat from exhaust gas in coal-fired power plants, industrial...

AI Technical Summary

Problems solved by technology

The development of low-grade waste heat recovery technology for wet desulfurization devices can not only realize the recovery of low-grade waste heat and reduce the energy consumption of industrial production processes, but also save water resources and improve the flue gas purification efficiency of desulfurization devices. However, the waste heat recovery process of wet desulfurization devices There are the following difficulties: (1) Low waste heat recovery efficiency: the gas-liquid reaction temperature in the desulfurization device is low, the temperature difference between the heat exchange equipment and the desulfurization slurry and desulfurization tail gas is small, and the amount of waste heat recovered during the heat exchange process is limited; (2) Recovery of waste heat Difficult to use: Affected by heat exchange conditions, the temperature of the heat-extracting medium that completes heat exchange is lower than the temperature of wet desulfurization slurry or desulfurization tail gas, the quality of recovered waste heat is further reduced, there are fewer ways to recover waste heat, and the economic benefits are not obvious

Therefore, the current research on energy-saving technologies and equipment based on the efficient recovery of low-grade waste heat in wet desulfurization units and the efficient utilization of recovered waste heat is still in a blank state.

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