Limestone-plaster wet method flue gas desulfurization composite synergistic agent

Abstract

The invention relates to a limestone-plaster wet method flue gas desulfurization composite synergistic agent, which comprises the following ingredients in percentage by mass: 40 percent to 50 percent of organic acid synergistic agents, 25 percent to 35 percent of organic salt synergistic agents, 15 percent to 20 percent of efficient activating agents, 5 to 10 percent of oxidation catalysts and 1 percent of tracers. The half dissolving time of limestone is shortened by more than 40 percent, and the dissolving speed of the limestone is greatly accelerated, so the activity of the limestone is greatly improved. Under the work condition of the designed surfur content, the circulation intensity of serous fluid can be reduced by one third to one half, the liquid-gas ratio of a system is reduced, the system resistance is reduced, the energy consumption of a desulphurization system is obviously reduced, the utilization rate of limestone and oxidation air is improved, and the scale formation and blockage effects on back-stage equipment are reduced. Under the condition that the coal-fired sulfur exceeds the design value, the utilization rate of the oxidation air can be improved by 50 percent to 60 percent, on the basis without transforming the original oxidative system, the oxidation effect that when the fired-coal surfur content exceeds 20 to 30 percent can be met, and the requirements of the desulfurization efficiency and the clean flue gas SO2 discharge concentration are met.

Description

technical field [0001] The invention belongs to the application field of flue gas desulfurization engineering technology in thermal power plants, and in particular relates to a composite synergist suitable for all limestone-gypsum wet flue gas desulfurization devices. Background technique [0002] The limestone-gypsum wet flue gas desulfurization process is widely used because of its mature technology, high desulfurization efficiency, abundant sources of absorbent, low price, and availability of by-products. It has become the most widely used method for flue gas desulfurization in coal-fired power plants. However, at present, the operation of limestone-gypsum wet flue gas desulfurization devices in thermal power plants in my country generally has high energy consumption and operating costs, poor adaptability to coal sulfur content, serious blockage and fouling of subsequent equipment in the absorption tower, and serious equipment wear, etc. The problem is that with the instab...

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Problems solved by technology

However, at present, the operation of limestone-gypsum wet flue gas desulfurization devices in thermal power plants in my country generally has high energy consumption and operating costs, poor adaptability to coal sulfur content, serious blockage and fouling of subsequent equipment in the absorption tower, and serious equipment wear, etc. The problem is that with the instability of my country's coal market, many power plants have been burning coal that exceeds the design sulfur content for a long time, resulting in the desulfurization system not operating normally. With the implementation of increasingly strict environmental protection emission standards, many desulfurization devices are forced to Carry out capacity expansion and transformation of existing equipment