Issue 19/2015 - High-efficiency flue gas denitration technology solves the urgent need to burn "coal"

Recently, the key technology of high-efficiency flue gas catalytic denitration developed by Zhejiang University is expected to solve the urgent need
for "coal" combustion.
By using a new catalyst developed in the project, the nitrogen oxide (NOx) content per cubic meter of flue gas emitted by the plant can be reduced to less than
50 milligrams.

The project, led by Professor Gao Xiang, Deputy Dean of the School of Energy Engineering, Zhejiang University, and Mr.
Cen Keyuan, has made substantial innovations and major breakthroughs in the design of high-efficiency denitrification catalyst system and catalyst preparation technology, catalyst regeneration and modification and mercury nitrate synergistic control technology, mixing and reaction process coupling and strengthening technology, etc.
, and successfully developed and industrialized the key technology and complete set of equipment for efficient catalytic denitrification with completely independent intellectual property rights
。
It is understood that per cubic meter of flue gas emitted by the factory, the nitrogen oxide content is less than 200 mg, which can meet the current standards of the EU and Japan, and less than 100 mg can meet the latest standards
of the United States and China.
By using the new catalyst, this number has been reduced to less than
50 milligrams.
At present, the key technology of high-efficiency flue gas catalytic denitrification has been applied to more than 300 coal-fired boilers, achieving an annual emission reduction of about 942,000 tons of nitrogen oxides, and the cumulative output value of cooperation has exceeded 5.
1 billion yuan
.

Denitration technology is currently widely used in countries to remove nitrogen oxides, of which the key role is the catalyst
.
In order to develop "powerful" catalysts adapted to China's industrial environment, Gao Xiang's team used quantum chemistry and computer simulations to screen out qualified catalyst formulations
more accurately and efficiently from thousands of combinations of different elements.
The catalyst they finally developed has greatly improved its resistance to toxicity and wear resistance, prolonging the service life
of the catalyst.
The research team also added elements such as rare earths to the formula, so that the catalyst is no longer so demanding on temperature, and it can also play a better role
when the boiler is running at low load.

In the process of improving the catalyst, the research team has already considered the problem of
recycling.
China's coal power capacity is the largest in the world, and the number of waste catalysts generated every year is four times that of the United States, and how to deal with it is a difficult problem
.
The cost of landfill is nearly 6,000 yuan per ton, and the waste catalyst is hazardous waste, and improper disposal will cause serious secondary pollution
.
To this end, the research team has invented a new set of cleaning, regeneration and modification methods, which can restore the activity of the original inactivated catalyst to 98%
of the fresh catalyst.

(Country)