High-temperature sulfur-containing nitrogen-containing flue gas waste heat multi-effect distillation seawater desalination system

Abstract

The invention discloses a high-temperature sulfur-containing nitrogen-containing flue gas waste heat type multi-effect distillation seawater desalination system. The system comprises a coal economizer, an electric dust remover, a desulfuration and denitration device and a low-temperature multi-effect distillation seawater desalination device, and further comprises an anti-corrosion heat exchanger, a circulating water flash tank and a gas-liquid separator. According to the system, sulfur-containing nitrogen-containing high-temperature flue gas waste heat can be fully recovered to serve as a heat source of the seawater desalination device, and therefore organic combination of flue gas waste heat recovery and multi-effect distillation seawater desalination can be achieved; the anti-corrosion heat exchanger can effectively solve the problems of low temperature acid dew corrosion and deposition of flue dust and deposit on the heat exchange surface in the heat exchange process of high-temperature sulfur-containing nitrogen-containing flue gas and seawater, commodity steam is not consumed, the operation cost of distillation seawater desalination is lowered, waste heat emission is reduced, and the energy utilization rate is increased; the temperature of the high-temperature sulfur-containing nitrogen-containing flue gas can be lowered to about 80 DEG C which is basically in accordance with the flue gas temperature required by the desulfuration and denitration device, and therefore the cooling water consumption needed by the fact that the temperature of the flue gas is lowered to the optimal technological temperature of desulfuration is reduced.

Description

technical field [0001] The invention relates to the technical fields of flue gas waste heat recovery and seawater desalination, in particular to a multi-effect distillation seawater desalination system for waste heat of high-temperature sulfur-containing and nitrogen-containing flue gas. Background technique [0002] With the continuous and stable development of my country's economy, the demand for water resources in various industries in society is increasing. Due to the obvious changes in rainfall with seasons and regions in our country, coupled with the increasing demand for industrial water year by year, some areas, especially the eastern coastal areas, have suffered a severe shortage of water resources, causing economic losses of hundreds of billions of yuan each year. Water resource crisis Has seriously restricted my country's economic development. In order to cope with the water crisis, in addition to the planned implementation of water storage and transfer projects a...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a solution for the problems of low-temperature acid dew corrosion and easy adhesion of scales in the high-temperature flue gas produced in coal power, refining, steel and other industries, especially in the waste heat recovery process of high-temperature sulfur-containing and nitrogen-containing flue gas. A high-temperature sulfur-containing nitrogen-containing flue gas waste heat type multi-effect distillation seawater desalination system

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