NOx treatment | What problems will exist in the operation process of coal-fired boiler denitrification?


Release time:

2024-07-06

The denitration efficiency of coal-fired boiler is affected by flue gas blockage and catalyst attenuation. Optimized design, enhanced maintenance, use of Green Valley SCR system, precision injection, improved system, iot control, and enhanced training can improve the stability of the denitration system and achieve environmentally friendly operation.

As an important energy conversion equipment, coal-fired boilers provide heat and electricity at the same time, but also accompanied by nitrogen oxide emissions. In order to meet the increasingly strict environmental protection standards, denitration technology is widely used in the flue gas purification of coal-fired boilers. In the actual operation process, the denitration system faces a variety of problems.

Nitrogen oxide emission poses a threat to the environment and human health, and is one of the main pollution causing acid rain and photochemical smog. The denitrification technology of coal-fired boilers is mainly selective catalytic reduction SCR, although these technologies have achieved remarkable results in reducing NOx emissions, there will be some problems in practical application.

First, the problems that may occur in operation are as follows:
1. Ash accumulation in the flue gas system leads to blockage: dust and other particles in the flue gas accumulate in the SCR reactor and related equipment, causing blockage and wear.
2, catalyst performance attenuation: long-term operation leads to a decline in catalyst activity, affecting the denitration efficiency.
3, ammonia injection system control is improper, resulting in ammonia escape or denitrification efficiency is not up to standard.
4. Improper control of flue gas temperature leads to too high or too low flue gas temperature affecting catalyst activity, which may lead to catalyst sintering or blockage.
5, design and construction defects: some denitration devices in the design and construction process did not fully consider the actual conditions, leading to problems in operation, resulting in installation deviation, flue gas system design is unreasonable.
6, technology and equipment update needs: with the improvement of environmental standards, the original technology and equipment need to be updated and optimized.

Second.,Analysis of the reasons for the deficiency in the operation process:
1, the design does not fully consider the actual conditions and long-term operation of sustainability;
2, lack of regular inspection and maintenance, failure to find and solve problems in time;
3, the operator of the denitration system operation training is insufficient;
4, not strong adaptation to environmental changes.

Third, solution strategy
1, optimize the design, in the design process, need to fully consider the actual conditions, the use of more reasonable flue gas treatment program.
2, strengthen equipment maintenance, regular inspection and maintenance of equipment to ensure the normal operation of equipment.
3, the use of green Valley environmental protection SCR denitration system, patented mixing technology, to ensure that ammonia gas and flue gas fully mixed, to achieve near-zero nitrogen oxide emissions;
4, accurate calculation of injection technology, to cope with load changes under the condition of stable emission standards;
5, improve the denitration system, improve its change to the environment;
6, the use of Internet of Things technology to achieve multi-class integrated remote control;
7, strengthen the training of operators, improve their understanding of the denitration system and operational skills.

It is necessary to comprehensively consider and solve problems in the denitration operation of coal-fired boilers. Through system optimization, optimized design, improved operational training, enhanced practicability and updated technology, the stability of denitration system operation can be effectively improved, and the normal operation of more environmentally friendly coal-fired boilers can be realized.