Flue gas desulfurization and denitration integrated apparatus

Abstract

The invention discloses a flue gas desulfurization and denitration integrated apparatus and relates to desulfurization and denitration device for chemical engineering. The apparatus includes a dust remover, an ozone reaction device, an absorption column, a gas-water separator, an ammonia water supplement device, an ozone generator and a control cabinet, which are all installed in a box body. The dust remover is connected to a chimney through a pipeline. A flue gas inlet on the ozone reaction device is connected to the dust remover. A flue gas outlet on the ozone reaction device is connected to the flue gas inlet on the absorption column. An ozone adding inlet is connected to the ozone generator. An electric heater is connected to the control cabinet to achieve automatic temperature control. The flue gas outlet on the absorption column is connected to the gas-water separator. An ammonia water supplement inlet is connected to the ammonia water supplement device for supplementing ammonia water to maintain a proper pH value of a mixed liquid. The gas-water separator is also connected to a draught fan. The apparatus can reach 99% in desulfurization rate and can reach more than 85% in denitration rate at a low temperature of 100-200 DEG C, can remove other pollutants at the same time, is small in occupied area and is convenient to transport.

Description

technical field [0001] The invention relates to chemical desulfurization and denitrification equipment, in particular to an integrated device for flue gas desulfurization and denitrification. Background technique [0002] With the rapid development of my country's economy, the emission of SO 2 and NO x and also growing. SO released from coal combustion 2 Accounting for 85% of total emissions, NO x Accounting for 60% of the total emissions, the amount of acid rain caused by the two accounts for 82% of the total amount of acid rain. Now, the economic loss caused by acid rain pollution in my country is about 500 billion yuan every year. [0003] The traditional flue gas desulfurization and denitration technology is a combination of wet flue gas desulfurization and selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) denitrification technology. Wet flue gas desulfurization is commonly used calcium method using lime or limestone, the desulfurizatio...

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Problems solved by technology

Wet flue gas desulfurization is commonly used calcium method using lime or limestone, the desulfurization efficiency is greater than 90%, its disadvantage is that the project is huge, the initial investment and operation costs are high, and it is easy to form secondary pollution; At ~450℃, the denitrification rate can reach 70%~90%

This technology is mature and reliable, and is currently widely used in the world, especially in developed countries. However, the investment in the process equipment is large, the flue gas needs to be preheated, the catalyst is expensive and the service life is short, and there are problems such as ammonia leakage and easy corrosion of equipment; The catalytic reduction temperature range is 870-1200°C, the denitrification rate is less than 50%, the investment in process equipment is large, the flue gas needs to be preheated, and the equipment is easy to corrode

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