Process method of device for removing ammonia nitrogen from desulfurization wastewater of power plant

Abstract

The invention discloses a process method of a device for removing ammonia nitrogen from desulfurization wastewater of a power plant. The device comprises an air stripping tank, an ammonia recovery tower, a tail gas absorption box, an aeration fan and a suction fan. According to the air stripping principle, low-cost self power generation of a power plant is utilized for desulfurization wastewater treated by a traditional triple box process, waste heat of boiler fixed and continuous drainage is used as a heating source, removed ammonia gas is recovered in two stages, and recovered ammonia water is directly used for denitration in the power plant. According to the process method, ammonia nitrogen existing in the desulfurization wastewater treated by a traditional process is removed and recycled through a deamination device, an ammonia collection device and a tail gas collection device, and the process method is particularly suitable for the desulfurization wastewater with relatively high ammonia nitrogen content, so that the ammonia nitrogen index of the sewage meets the standard for putting sewage into a sewage collection pipe, and the removed ammonia nitrogen is recycled.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment technology, in particular to a process method of a desulfurization wastewater removal device for ammonia nitrogen in a power plant. Background technique [0002] At present, the conventional desulfurization wastewater treatment process in power plants is a three-box process, and the process principle is to adjust the pH→Na 2 S sedimentation→PFS flocculation→coagulation aid→sedimentation. This process does not consider the removal of ammonia nitrogen, resulting in high ammonia nitrogen indicators in the effluent, often exceeding 150mg / L, and even reaching 3000mg / L in severe cases, failing to meet the sewage management standards. (less than 35mg / L). [0003] The water quality of desulfurization wastewater is generally acidic (pH 4-6), containing a large amount of suspended solids, ammonia nitrogen, heavy metal pollutants, and Ca2+, Mg2+, F-, SO42-, Cl-, S2-, etc. If the...

AI Technical Summary

Problems solved by technology

However, the conventional blow-off method consumes a lot of energy, and there is a problem of secondary pollution. There are many factors affecting the blow-off efficiency, which is not easy to control. The blow-off efficiency is generally only 60% to 70%. The stripping efficiency will be greatly reduced, and steam needs to be introduced to raise the temperature of wastewater, which will increase additional energy consumption. There is no link for ammonia recovery, and it will be directly discharged into the atmosphere, causing air pollution

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