Application of alkyl sulfonate to in-furnace desulfurization and desulfurizing and coal saving method

Abstract

The invention relates to application of alkyl sulfonate to in-furnace desulfurization and a desulfurizing and coal saving method. The invention discloses a two-step desulfurizing and coal saving process, and belongs to the technical field of flue gas sulfur dioxide processing. The method comprises two steps: 1, in-furnace desulfurization, wherein byproducts of the desulfurizing in the furnace in-furnace desulfurization can be taken as raw materials for flue gas desulfurization of step 2 after screen separation treatment; and 2, the flue gas desuferization. Compared with the prior art, the two-step desulfurizing and coal saving process has the characteristics of high desulfurization efficiency, low cost and the like.

Description

technical field [0001] The invention relates to coal-fired desulfurization technology, in particular to the application of alkyl sulfonate in furnace desulfurization and the corresponding desulfurization and coal-saving method. Background technique [0002] There are many mature desulfurization processes in the prior art, such as simple wet limestone-gypsum desulfurization process. This process uses lime slurry as a desulfurizer to complete the desulfurization of flue gas through absorption, separation, demisting and other treatments. However, this process can only desulfurize about 75% of the flue gas, and the efficiency of the desulfurization device is ≥90%. The other 25% of the flue gas does not pass through the desulfurization device, but directly enters the chimney after bypassing the temperature. Although this process has the characteristics of simple process structure, low initial investment and operating costs, it has the following disadvantages: 1. The low-temperat...

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Problems solved by technology

However, this process can only desulfurize about 75% of the flue gas, and the efficiency of the desulfurization device is ≥90%, and about 25% of the flue gas does not pass through the desulfurization device, but directly enters the chimney after bypassing the temperature rise

Although this process has the characteristics of simple process structure, low initial investment and operating costs, it has the following disadvantages: 1. The low-temperature flue gas after desulfurization and the high-temperature flue gas without desulfurization are mixed and discharged after heating, which improves the humidity of the exhaust gas; 2. The flue gas desulfurization efficiency is only about 70%, which cannot meet the increasingly high environmental protection technical requirements of the current society

Although this process can achieve better desulfurization efficiency, it still has the following deficiencies: First, it only absorbs sulfur dioxide in the flue gas in the furnace, flue and desulfurization tower, and cannot directly remove the solid sulfur in the furnace, missing a It is a very good opportunity for desulfurization; secondly, part of the calcium oxide decomposed from calcium carbonate will be directly discharged out of the furnace together with the desulfurization mixed slag composed of calcium sulfate and other substances, and the utilization rate of the desulfurizer is still at a low level; here is a bit Inappropriate, because part of the desulfurizer after the three-stage separation is used in the wet desulfurization of the tail gas, so as to improve the utilization rate of the desulfurizer, and the utilization rate is relatively high (you may have misunderstood here, what I said It is at a relatively low level, which refers to the method in the comparative literature, which points out the deficiencies of the prior art); third, it is necessary to add humidification flue, desulfurization tower and other equipment, and the investment and operation costs are relatively high

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