Gas-liquid contact type non-phase-change middle medium heat exchange wet-type desulfuration method and apparatus

Abstract

The invention discloses a gas-liquid contact type non phase transition intermediate medium heat transfer wet desulfurization method and a device thereof. Flue gas enters a flue gas cooling section through an air preheater to carry out pre-desulfurization and release heat towards desulfurization liquid to bring down temperature, and then enters a desulfurization section; the desulfurization liquid absorbs the heat of the flue gas to cause the temperature to rise to 90 to 95 DEG C and then enters a purified flue gas heating section and an air preheating section to release heat again; the lower part of the desulfurization section of the device is connected with the flue gas cooling section which is respectively connected with the purified flue gas heating section and the air preheating section; the air preheating section is connected with the air preheater and the air preheater is connected with the flue gas cooling section; an outlet at the top of the desulfurization section is connected with the purified flue gas heating section; the bottoms of the air preheating section and the purified flue gas heating section are connected with a sedimentation tank which is connected with a spray device at the upper part of the desulfurization section. The method and device greatly improve the heat efficiency of boilers; meanwhile, the minimum wall temperature of the air preheater is greatly increased and far away from a flue gas acid dew point, thereby guaranteeing the safe operation of boilers and preventing heating surfaces from acid dew corrosion.

Description

Technical field: [0001] The invention relates to a gas desulfurization purification method and device, in particular to a gas-liquid contact non-phase-change intermediate medium heat exchange wet desulfurization method and device for boiler flue gas desulfurization purification and comprehensive utilization of heat energy Background technique: [0002] Limestone wet flue gas desulfurization device is the flue gas desulfurization device with the largest commercial application scale, the highest desulfurization efficiency and the most mature technology in the world. As a large number of limestone wet flue gas desulfurization devices have been put into operation in my country, desulfurization devices have become the main devices for the operation of coal-fired power plants in addition to boilers, steam turbines and generators. In the limestone wet flue gas desulfurization device: the temperature of the treated flue gas is generally 130°C to 140°C. On the one hand, before the r...

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Problems solved by technology

[0005] In order to overcome the problems of high operating cost, prone to dew condensation, ash plugging and serious equipment corrosion in the current flue gas desulfurization method, the purpose of the present invention is to provide a method that makes full use of the heat in the desulfurization process and reduces external A gas-liquid contact non-phase change intermediate medium heat exchange wet desulfurization method is provided with a heating device and a heating process to reduce operating costs in the flue gas desulfurization process, prevent condensation, and prolong the service life of the equipment

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