Heat preservation and application of heating pipe in flue gas denitrification system

Published on:

2023-04-20 17:38

The flue gas denitrification system of a thermal power plant is an important environmental treatment facility in the power generation system The stability of the denitrification system has a great impact on the protection of the atmospheric environment in the adjacent area. The urea hydrolysis ammonia production system includes a urea dissolution tank, a urea solution pump, a urea solution storage tank, a feed pump, a hydrolyser, an ammonia buffer tank, and other equipment. The urea solution in the hydrolyser is hydrolyzed to ammonia, carbon dioxide, and water vapor under specified conditions such as temperature, pressure, and residence time, and after pressure adjustment is transported to the ammonia buffer tank. However, during the operation of the ultra-pure system, the operation of the denitrification system was unstable, ammonia gas carried water seriously, and the reaction efficiency of the denitrification catalyst was low, causing resistance to environmental management.

Take as an example a thermal power plant in Anyang, Henan Province. After analysis, the main reasons for the unstable operation of the station denitrification system, the low efficiency of the ammonia gas water reaction, and the low efficiency of the denitrification catalyst reaction are: the original device product gas pipeline is long, the pipeline is poor heat insulation and heating effect, which causes the product gas temperature to drop excessively, In addition, the volume of the product gas is very high. And the temperature of the product gas below the dew temperature Hidden danger of the mixed ammonia-air gas pipeline corrosion After the ammonia mixer with air in the SCR zone, the water contact in the pipeline with the ash carried by the secondary air will cause an accumulation that will affect the denitrification efficiency of the flue gases and lead to instability of the emission of nitrogen oxides in the flue gases.

When analyzing causes, the main cause of pipeline blockage and poor denitrification effect is poor heat preservation and pipeline heating effect. Thus, the conversion goal can only be achieved by selecting the best heat preservation method and heating method to further improve the heat preservation and heating effect of the pipeline. In recent years, there are three main methods for heating a steam forecastle, heating pipes with a steam jacket and electric heating in the transportation of gaseous products of a urea and ammonia hydrolysis plant.

After many comparisons, the energy company finally opted for our composite heating and sampling pipe.

After the plant reformed the thermal insulation and heating of the product gas pipeline of the urea hydrolysis ammonia production system, it completely eliminated the hidden danger of condensate blockage caused by the long pipeline and poor thermal insulation and heating effect, improved the stability of the denitrification system operation, and reduced nitrogen oxide emissions in flue gases.

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