3 years ago

Energy-saving combination of N2 production, NH3 synthesis, and power generation

Energy-saving combination of N2 production, NH3 synthesis, and power generation
A novel integration of N2 production, NH3 synthesis, and power generation systems is designed to efficiently convert H2 to NH3. The integrated system employs the principles of exergy recovery and process integration to achieve high energy efficiency. The high-purity N2 output by the N2 production module is reacted with H2 in an NH3 synthesis module to produce NH3. In addition, O2-rich gas, which is a by-product, is utilized as an oxidant in the power-generation module. A single column is adopted in the N2 production module, and the feed stream is split into two and fed to the middle and bottom of the column. In our tests with the N2 production module, the two operating parameters of bottom-feed ratio and refed-stream ratio were evaluated in terms of the energy consumed, N2 purity, and O2 molar fraction in O2-rich gas. Compared with previous studies on N2 production systems, our N2 production module can reduce energy consumption by about 43% (3.27 MW compared with 5.76 MW to produce 1 tmol-N2 h−1). In the NH3 synthesis and power generation module, the two operating parameters of conversion rate per pass and purged-stream ratio are also evaluated. The calculation results show that a high conversion rate per pass and low purged-stream ratio increase the total energy efficiency, which includes NH3 production efficiency and power generation efficiency. The highest total energy efficiency that can be achieved by the integrated system is 66.92%, which includes a NH3-production efficiency of 66.69% and a net power generation efficiency of 0.23%.

Publisher URL: www.sciencedirect.com/science

DOI: S0360319917337102

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