The Research And Energy Efficiency Optimization On Carbon Capture By Ammonia With Reinforced Crystallization

Based on 300 MW power plant, using software Aspen plus, the traditional and the new model is set up. Comparative analysis of the effects of the operating parameters on CO2 removal efficiency, ammonia escape, CO2 removal amount and regeneration heat duty between the two technologies is carried out. Obtaining that the new technology has a great advantage on CO2 absorption and desorption process. In absorption process, the new technology guarantees the high reaction rate and the high NH3 efficiency. In desorption process, the new technology has capture the amount of carbon more 30% than the old technology. More important, the regeneration heat duty of the new technology is only 41.5% of the traditional one. And the experiment research on absorption and crystallization process is carried out, which has proved the accuracy of the conclusions drawn from the simulation study related to the absorption process.The typical 300 MW power plant model of steam cycle is set up. The different load of power plant is defined, set and analyzed. Comparative analysis of the actual value and the calculations of flow rate of every extracting points of steam. Taking the 50%,75%,100% and the peak loads as variable, analysis the temperature, pressure and flow rate of every extracting points of steam. Meanwhile, analysis the simulation and the calculated value of material and work flow of small steam turbine as well as heat consumption of unit and steam turbine. Obtaining that the simulated value is agree with the actual value.The integration of the two CO2 desorption models and the steam cycle is set up. Comparative analysis of the advantages and disadvantages of the two technology models. The analysis is considered from energy consumption and the power generation. Obtaining that, on one hand, the effect of extracting points of steam at low-pressure end is larger than at high-pressure end on power generation;On the other hand, the energy consumption of new technology is lower than the traditional one, so is the power generation. Obtaining that the new technology has a big advantage in reducing energy consumption of CO2 capture system, so the new technology has optimized the energy efficiency of CO2 capture system in power plant. The works of this paper can provide a new reference for CO2 capture technology.