Alkali recovery boiler tail gas cyclic treatment method and equipment

Abstract

The invention discloses an alkali recovery boiler tail gas cyclic treatment method and equipment. The equipment comprises an alkali recovery boiler, a disc evaporator, an atomizing nozzle, a papermaking black liquor inlet, a disc evaporator tail gas inlet, an alkali recovery boiler exhaust port, a liquid caustic soda recovery pipe, a liquid caustic soda pump, an incinerated material outlet, a temperature sensor, an electromagnetic exhaust valve, a control cabinet, a flow control valve and a controller. Liquid caustic soda obtained by concentration in the disc evaporator is recovered and used for spray neutralization of acidic tail gas generated in an alkali recovery boiler, and by low cost, tail gas generated by the alkali recovery boiler reaches emission standards.

Description

technical field [0001] The invention relates to the field of papermaking industry, in particular to a method and equipment for circulating treatment of tail gas of an alkali recovery boiler. Background technique [0002] Alkali recovery is one of the core links in the modern large-scale kraft pulping production line. The alkali recovery boiler is responsible for treating the waste liquid generated in the pulping process, and recovering the sodium hydroxide used in the pulping process through combustion and causticization reaction. , and the heat obtained from combustion is converted into steam or electricity used in production, but the current alkali recovery process has a big problem. The tail gas generated by the alkali recovery boiler contains a large amount of sulfide and other acidic substances, which are directly discharged into the air and will be harmful to the surrounding environment. It has a great impact and does not meet the emission requirements, so how to deal ...

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Problems solved by technology

[0002] Alkali recovery is one of the core links in the modern large-scale kraft pulping production line. The alkali recovery boiler is responsible for treating the waste liquid generated in the pulping process, and recovering the sodium hydroxide used in the pulping process through combustion and causticization reaction. , and the heat obtained from combustion is converted into steam or electricity used in production, but there is a big problem in the current alkali recovery process. The tail gas produced by the alkali recovery boiler contains a large amount of acidic substances such as sulfide, which is directly discharged into the air. It has a great impact and does not meet the emission requirements, so how to deal with the tail gas produced by the alkali recovery boiler has become a key issue

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