Multi-pollutant cooperative control system for flue gas and water collection technology thereof

Abstract

The invention relates to a multi-pollutant cooperative control system for flue gas and a water collection technology thereof. The multi-pollutant cooperative control system for the flue gas comprisesa desulfurization tower arranged in a flue, wherein the desulfurization tower is internally provided with one or more group of desulfurization spraying layer, a cooling and liquid deposition layer, acooling and spraying layer, a demister and a flue gas heat exchange layer in sequence from bottom to top; a cooling liquid pipeline communicated and connected with the cooling and liquid deposition layer is arranged outside the desulfurization tower; the other end of the cooling liquid pipeline is communicated and connected with a liquid returning opening of a circulating liquid cooling tower; a bottom liquid outlet of the circulating liquid cooling tower is communicated and connected with a liquid supply pipe of the cooling and spraying layer through a first circulating pipeline which is connected with a condensing and cooling circulating pump in series; a second circulating pipeline which is connected with a desulfurization circulating pump in series and is communicated with a desulfurization slurry tank is arranged outside the desulfurization tower; the other end of the desulfurization tower is communicated and connected with each desulfurization and spraying layer. By adopting themulti-pollutant cooperative control system, deep cooperative control can be carried out on a plurality of pollutants in wet-process desulfurization tail gas; near zero emission of the plurality of pollutants is realized and water in wet flue gas is recycled; the system can also be used for deep treatment of other high-humidity flue gas.

Description

technical field

[0001] The invention relates to the technical fields of chemical industry and environmental protection, in particular to a flue gas multi-pollutant cooperative control system and a water collection process thereof. Background technique

[0002] At present, 100% of the flue gas from thermal power coal-fired boilers in my country has been sent to desulfurization devices, and more than 90% of them have adopted limestone-gypsum wet flue gas desulfurization technology. During the operation of the coal-fired boiler wet desulfurization device, a large amount of water is brought out by the exhaust gas of the desulfurization tail gas. Taking a 300MW unit as an example, the desulfurization system consumes 120m water per hour 3 / h, including 71.8m moisture in the original flue gas 3 / h, desulfurization system make up water 40m 3 / h, based on the annual operating time of 8000 hours, the annual water consumption of a 300MW unit is 1 million tons. Discharge flue gas 100...

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