Comprehensive treatment method for boiler smoke

Abstract

A comprehensive treatment method for boiler smoke includes the following steps that firstly, a desulphurization solution containing sodium hydrosulfide and sodium sulfide in a desulphurization tank is pumped into an inner cavity of a desulphurization tower through a desulphurization pump; secondly, sulfur dioxide in the smoke and sodium hydrosulfide and sodium sulfide in the desulphurization solution are reacted in the inner cavity of the desulphurization tower, and the reacted desulphurization solution drops into the lower part of the desulphurization tower and then flows into a buffer tank through a lye outlet; thirdly, an upper-layer solution of the desulphurization solution in the buffer tank flows into the desulphurization tank. According to the method, when the boiler smoke is desulfurated, the solution containing sodium hydrosulfide and sodium sulfide is treated at the same time; by means of the method, existing boiler smoke desulphurization equipment can be refitted without building new desulphurization equipment; by adopting the solution containing sodium hydrosulfide and sodium sulfide for removing sulfur dioxide in the boiler smoke, a lot of desulphurization water can be saved, the flue gas desulphurization cost is lowered, the effect of treating waste with waste is achieved, and great social benefits are achieved.

Description

technical field [0001] The invention relates to a method for treating boiler flue gas. Background technique [0002] The flue gas emitted by the current coal-fired boilers contains a certain amount of sulfur dioxide. At present, the commonly used desulfurization methods include limestone desulfurization, double-alkali desulfurization and ammonia desulfurization. These desulfurization methods need to consume more resources and cost. Higher. At present, some enterprises have a large number of mixed liquids generated by treating waste gas containing hydrogen sulfide. These mixed liquids contain a certain amount of sodium hydrosulfide and sodium sulfide. If fresh sodium hydroxide solution is used to treat hydrogen sulfide waste gas, The resulting mixed solution can be used to make sodium hydrosulfide slices, but some enterprises will produce a large amount of waste lye due to the process requirements in production. The waste lye contains a certain amount of sodium hydroxide and ...

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Problems solved by technology

[0002] The flue gas emitted by the current coal-fired boilers contains a certain amount of sulfur dioxide. At present, the commonly used desulfurization methods include limestone desulfurization, double-alkali desulfurization and ammonia desulfurization. These desulfurization methods need to consume more resources and cost. Higher. At present, some enterprises have a large number of mixed liquids generated by treating waste gas containing hydrogen sulfide. These mixed liquids contain a certain amount of sodium hydrosulfide and sodium sulfide. If fresh sodium hydroxide solution is used to treat hydrogen sulfide waste gas, The resulting mixed solution can be used to make sodium hydrosulfide slices, but some enterprises will produce a large amount of waste lye due to the process requirements in production. The waste lye contains a certain amount of sodium hydroxide and a large amount of impurities , these enterprises will use these waste lye to treat hydrogen sulfide-containing waste gas, and the mixed liquid generated by using waste lye to treat hydrogen sulfide-containing waste gas is not suitable for making sodium hydrosulfide slices. How to deal with these mixed liquids containing a large amount of impurities is also a business problem

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