Limestone activity test method and test device for wet process of FGD

Abstract

The invention discloses a reactivity test method and test device of limestone for wet flue gas desulfurization. The test method is that firstly, an acidic reagent and limestone slurry are prepared. The acidic reagent is instilled in the limestone slurry for reaction to test the reactivity. The acidic reagent is SO2 ethanol solution. The concentration of the SO2 ethanol solution is 0.05-0.5mol / L. The test device includes an acid reagent bottle, a reaction vessel, a constant temperature magnetic agitator and an automatic titrator. The acid reagent bottle is connected with a pipette of the automatic titrator. A liquid dripping tube of the automatic titrator is connected with the reaction vessel. The inside of the reaction vessel is connected with a titrating sensor of the automatic titrator and a thermometer of the constant temperature magnetic agitator. The bottom of the reaction vessel is equipped with a rotator of the constant temperature magnetic agitator. The acid reagent bottle is connected with the pipette of the automatic titrator in a way of sealing. Compared with prior art, the invention has the advantges of simple system, convenient operation, rapid and accurate detection, etc.

Description

technical field [0001] The invention relates to a method for testing the reactivity of limestone for wet flue gas desulfurization and a testing device for realizing the testing method, belonging to the technical field of wet flue gas desulfurization. Background technique [0002] my country's annual SO 2 The emissions reached about 20 million tons, which is the largest amount of SO in the world 2 Countries with the largest emissions, in which coal-fired thermal power plants emit SO 2 It is more than 8 million tons, which is SO 2 big emitters. my country's air pollution is a typical soot-type pollution, and dust and acid rain are the most harmful. According to statistics, the area of ​​my country's acid rain has reached 30% of the total land area. The key to solving acid rain problem is to control SO 2 Pollution, power plant flue gas desulfurization is the mitigation of SO 2 An effective way to pollute, the limestone / gypsum wet flue gas desulfurization process (WFGD) is...

AI Technical Summary

Problems solved by technology

[0015] If method (2) directly puts SO 2 gas (or containing SO 2 Simulated flue gas) into limestone slurry to measure the reactivity of limestone, there are the following problems: (a) gas flow is difficult to control and measure; (b) SO 2 The solubility in water is small (under normal temperature and pressure, 1L of water can only dissolve about 40L of SO 2 gas), SO in limestone slurry 2 The gas is difficult to dissolve and react quickly, and the spilled gas is difficult to collect and measure accurately

However, the experimental system of this method is very large, the construction and operation costs are high, the experimental cycle is long, and the operation is complicated. During the experimental process, the flow field in the pipeline fluctuates greatly, and the SO 2 It is also difficult to accurately measure the concentration

[0017] Due to the above reasons, the limestone activity data obtained by the above method are rarely used in the actual engineering design and desulfurization optimization model, so that the selection of relevant parameters in the wet flue gas desulfurization process mainly depends on experience. In order to ensure the desulfurization efficiency, the insurance factor is often The investment and operating costs of the desulfurization system are greatly increased

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