- - Integrated evaporative crystallization device
- - High organic and high salt wastewater recycling system
- - Waste water evaporation and fractional crystallization system
- - Zero discharge of desulfurization wastewater and salt recycling system in coal-fired power plant
- - High efficiency membrane concentration wastewater reuse system
- Product introduction
- Technical advantages
- engineering application
General idea and solution
At present, for the ammonia injection control of most coal-fired power plants, there are three problems: uneven distribution of flow field and NOx concentration field, inability to realize regional ammonia injection, and inability of ammonia injection control to respond to changes in working conditions in time. In order to realize intelligent ammonia injection, it is necessary to optimize the flow field, adopt more scientific full section monitoring method, more advanced control strategy and more accurate control model to control the total amount of ammonia injection and the amount of ammonia injection of each branch, so as to realize regional fine ammonia injection.
Figure 2 precision control model
Figure 4 shows the demonstration project of intelligent ammonia injection transformation of 1000MW unit in a power plant. The basic situation of denitration device is shown in Table 1. In order to evaluate the effect of intelligent ammonia injection transformation, the flow field distribution, urea consumption per unit power generation, NOx concentration at the outlet, ammonia escape, NOx non-uniformity at the denitration outlet and ammonia nitrogen molar ratio before and after the transformation were compared.
Flow field distribution at denitration inlet
Urea consumption per unit power generation v.s. NOx concentration at outlet
NOx unevenness at denitration outlet
Ammonia nitrogen molar ratio
Taking 1000MW unit as an example, the economic benefits after intelligent ammonia injection transformation are calculated, including direct economic benefits and indirect economic benefits.