Nitrogen oxide (NOx) is one of the main pollutants in coal-fired power plants and other industrial processes, which poses a serious threat to the environment and human health. Selective catalytic reduction (SCR) technology, as the most widely used NOx treatment technology at present, reduces NOx to nitrogen (N₂) and water (H₂O) under the action of catalysts. The NOx emission is effectively reduced. However, the performance of SCR denitration system is affected by many factors, among which the smoke volume is the key parameter. This paper mainly discusses the influence of smoke volume on SCR denitrification technology.
The smoke volume in working condition refers to the smoke volume produced by combustion equipment in unit time, which directly affects the working efficiency and denitrification effect of SCR denitrification system. Generally speaking, the larger the flue gas volume, the amount of NOx processed by the SCR denitration system will also increase, but too large flue gas volume may exceed the designed processing range of the SCR denitration system, resulting in a decrease in the efficiency of flue gas treatment. Therefore, in the design and operation of SCR denitration system, it is necessary to fully consider the change of smoke volume in the working condition to ensure that the system runs in the best working state.
When the smoke volume is relatively small, the SCR denitrification system may not be able to fully deal with all nox emissions, resulting in reduced denitrification efficiency. At the same time, the denitrification efficiency can be improved by adjusting the amount of ammonia injection and optimizing the selection of reaction catalysts. On the contrary, if the working condition is too large, it may lead to uneven mixing of ammonia and NOx in the reactor of SCR denitration system, reducing the denitration efficiency. Increasing the flue gas flow rate requires increasing the working flue gas volume, which may reduce the contact time between the flue gas and the catalyst, thus affecting the denitrification efficiency. In order to effectively maintain the denitrification efficiency at high temperature flue gas volume, it may be necessary to increase the amount of catalyst or optimize the reactor design.
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Fluctuations in flue gas volume may change the chemical composition and temperature distribution in the flue gas, and these changes may affect the activity and selectivity of the catalyst, and the catalyst may exhibit different reaction mechanical properties under different temperature and chemical conditions.
To increase the gas volume, more energy is needed to heat the catalyst to the operating temperature, in this process, will increase more energy consumption and operating costs, in addition, the increase in the resistance of the system, the need for greater power of the fan, further increasing the energy consumption. The increase in smoke volume can lead to pressure loss, resulting in wear on fans and other equipment, which not only increases maintenance costs, but may also affect the service life of the equipment.
SCR catalysts typically perform best within a specific temperature window, and fluctuations in smoke volume may affect the temperature distribution within the reactor, requiring more refined temperature control to maintain optimal operating conditions.
Under the condition of high smoke volume, if the injection amount of reducing agent is not properly adjusted, it may lead to excessive injection of ammonia, resulting in ammonia escape. In this process, it will not only reduce the efficiency of denitrification, but also lead to environmental pollution.
Working condition smoke volume has many influences on SCR denitrification technology. From denitrification efficiency to system design, in order to achieve efficient NOx treatment, SCR denitrification system must be designed and optimized to adapt to different working conditions. Through technological innovation and management, SCR technology can play the best performance under various smoke volume conditions. Contribute to the protection of the environment and human health.
Post time: Jun-19-2024