Power plant denitrification treatment
Selective Catalytic Reduction (SCR) controls the NOx in diesel exhaust, using NH3 or urea (usually using a 32.5% urea aqueous solution) as a reducing substance, and the O2 concentration is higher than the NOx concentration by more than two orders of magnitude. Under certain temperature and catalyst, NOx is reduced to N2 and H2O by NH3. Since NH3 selectively reduces NOx preferentially without first reacting with O2, it is called "selective catalytic reduction". For the excess NH3, a certain proportion of ammonia slip catalyst (ASC) is coated on the end of the SCR carrier to ensure that NH3 reacts with O2 to form N2 and H2O, so as to avoid secondary pollution caused by NH3 leakage. The exhaust temperature of the diesel engine or the gas engine is generally in the range of 300 ° C to 500 ° C, which satisfies the temperature conditions required for the medium temperature catalytic reaction. If the exhaust temperature after the vortex is higher than 500 ° C, the high temperature catalyst should be considered, and the system cost will have a certain proportion. Rise.
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Technology Introduction
Selective Catalytic Reduction (SCR) controls the NOx in diesel exhaust, using NH3 or urea (usually using a 32.5% urea aqueous solution) as a reducing substance, and the O2 concentration is higher than the NOx concentration by more than two orders of magnitude. Under certain temperature and catalyst, NOx is reduced to N2 and H2O by NH3. Since NH3 selectively reduces NOx preferentially without first reacting with O2, it is called "selective catalytic reduction".
For the excess NH3, a certain proportion of ammonia slip catalyst (ASC) is coated on the end of the SCR carrier to ensure that NH3 reacts with O2 to form N2 and H2O, so as to avoid secondary pollution caused by NH3 leakage.
The exhaust temperature of the diesel engine or the gas engine is generally in the range of 300 ° C to 500 ° C, which satisfies the temperature conditions required for the medium temperature catalytic reaction. If the exhaust temperature after the vortex is higher than 500 ° C, the high temperature catalyst should be considered, and the system cost will have a certain proportion. Rise.
Technical advantages
China's biomass energy resources are very rich, and the development of biomass power generation industry has broad prospects. On the one hand, China's crop planting area is 1.8 billion mu, with an annual production of about 700 million tons of material. It is equivalent to 350 million tons of standard coal. In addition, agricultural product processing waste, including rice husks, corn cobs, peanut hulls, bagasse and cottonseed hulls, is also an important biomass resource. On the other hand, China's existing forest area is about 195 million hectares, the forest coverage rate is 20.36%, and the annual biomass resources are about 800 million to 1 billion tons.
At the same time, the development of biomass power generation and the implementation of coal substitution can significantly reduce carbon dioxide and sulfur dioxide emissions, resulting in huge environmental benefits. Compared with traditional fossil fuels, biomass energy is a clean fuel. After combustion, carbon dioxide emissions belong to the natural carbon cycle and do not form pollution. According to estimates, the operation of a 25,000 kW biomass generator set can reduce CO2 emissions by about 100,000 t/a compared with the same type of thermal power unit.
By 2025, biomass power generation will dominate in renewable energy. In the future, the use of biomass renewable energy to generate electricity has become one of the important ways to solve energy shortages.
In addition, there are more than 54 million hectares of suitable forest land in China, which can be combined with ecological construction to grow crops. These are the advantages of China's development of biomass power generation industry. The development of biomass power generation industry is an important way to build a stable, economic, clean and safe energy supply system and break through the constraints of economic and social development resources and environment.
The significance of development: 1. Increase the proportion of clean energy in China 2. Improve the environment 3. Increase farmers' income and narrow the gap between urban and rural areas.
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