SCR denitration, namely selective catalytic reduction technology, refers to the reduction and removal reaction of NH3 with NOx preferentially under the action of catalyst and the presence of oxygen to generate nitrogen and water.
The reaction core of SCR denitration is the denitration catalyst. The service life of SCR catalyst is about 3-5 years. In 2014, China's coal-fired power plants began to use SCR catalyst on a large scale to achieve the denitration goal. With the increasing use of SCR denitration system catalyst in thermal power and non electric fields nationwide, a large number of denitration catalysts will be scrapped in China in the next 1-2 years from this year. It is predicted that by 2025, the waste volume of denitration catalyst will reach 40100 cubic meters, and the annual waste volume will reach 200000 tons.
Once the service life of SCR catalyst is reached, it is defined as hazardous solid waste due to its own composition. Before, most of the treatment methods of enterprises were landfill or harmless treatment, which still has a certain damage to the environment and a waste of resources.
With the implementation of the new solid waste method, it is urgent to develop the regeneration technology of denitration catalyst. In the future, the regeneration of denitration catalyst will change to the direction of resource utilization, from the traditional linear process of resource exploitation, generation, use and scrapping to the recycling process of new catalyst production, regeneration and recovery, so as to realize the reuse of raw materials. In addition, denitration technology will also make more use of big data, artificial intelligence and other technologies to realize intelligent denitration, control the process more accurately, and even develop integrated technologies such as dust removal, desulfurization and denitration.
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