Process for preparing calcium-based sorbent through normal pressure dry slaking

Abstract

The invention discloses a process for preparing a calcium-based sorbent through normal pressure dry slaking, which comprises the following steps of: mixing a modified additive and a raw material CaO in a raw material storage bay, and adding into a continuous slaking system; and supplying slaking water to the slaking system through two-fluid spray nozzles at three water distribution points, making the raw material fully contacted with water to perform slaking reaction in the process of spirally stirring and proceeding so as to generate dry Ca(OH)2 with certain water content. In the slaking process of the raw material CaO, the influence of the water / ash ratio, slaking water initial temperature, stirring speed and slaking time on the slaking process is mainly considered, and according to small tests and pilot tests of a laboratory system, the technological process for generating the Ca(OH)2 through dry slaking of the CaO is optimized by taking the specific surface area, the porosity and reactivity as slaking product indexes. The process is simple; wastes can be utilized; and the slaking effect of the sorbent is improved, and the desulfurization efficiency is improved and the desulfurization operating cost is reduced further.

Description

technical field [0001] The invention relates to a production process for preparing a dry calcium-based desulfurizer, in particular to a semi-dry lime digestion process suitable for sintering flue gas desulfurization. Background technique [0002] my country has been plagued by air pollution for a long time, especially SO 2 Pollution is more serious. Over the years, my country has carried out research and application of various desulfurization technologies, among which flue gas SO 2 More flue gas desulfurization technology is used to control. [0003] Flue gas desulfurization technology mainly uses alkaline substances to absorb or absorb SO in flue gas 2 , and convert it into a relatively stable sulfur-containing compound or elemental sulfur that can be separated, so as to control SO 2 escape purpose. According to the morphological characteristics of desulfurization agent and desulfurization products, flue gas desulfurization is generally divided into wet method, dry met...

AI Technical Summary

Problems solved by technology

Due to the activity of powdered CaO compared to Ca(OH) 2 low, cannot directly interact with SO after entering the desulfurization reaction section 2 reaction, the desulfurization reaction process is to first react with water to generate Ca(OH) 2 , then with SO 2 reaction, thus reducing the desulfurization reaction rate, which is not conducive to the effective use of desulfurization agent and the improvement of desulfurization efficiency; while Ca(OH) 2 With good activity and fast reaction rate, it is the preferred desulfurizer for this type of desulfurization process

Although the dry flue gas desulfurization process is flexible and simple, it also has the problem of relatively low desulfurization agent utilization and desulfurization efficiency. Based on the principle of low cost and high efficiency, the preparation of highly active Ca(OH) 2 Become a key step in the dry flue gas desulfurization process

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