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Energy required for CO2 compression (ecomp) This is the electrical energy required (kWh per tonne CO2) to compress a unit mass of CO2 product stream to the designated pressure (P CO2) expressed in psig. Compression of CO2 to high pressures takes lot of energy, and is a principle contributor to the overall energy penalty of a CO2 capture unit in a power plant. CO2 compression efficiency (comp) This is the effective efficiency of the compressors used to compress CO2 to the desirable pressure. Typically, the value of compressor efficiency (comp) is about 80%. It maybe noted that the energy requirement calculated from the performance equation (ecomp) has to be corrected by this efficiency factor in order to get the total energy required for CO2 compression. The following set of parameters are relevant only if the CO2 capture system has been configured to include an auxiliary NG boiler to supply sorbent regeneration heat. Heating value of natural gas (NGHV) This is the high heating value (HHV, MJ/ kmole NG) of the natural gas used as fuel for the auxiliary boiler. Density of natural gas (NG) This is the density (lb/ft3) of the natural gas used as fuel for the auxiliary boiler. Average molecular weight of natural gas (mwNG) This is the average molecular weight (kg / kmole NG) of the natural gas used as fuel for the auxiliary boiler. This is a function of the molar composition of the natural gas. Flow rate of natural gas (mNG) This is the total molar flow rate (kmole NG / hr) of the natural gas used as fuel for the auxiliary boiler. It is basically a function of the total heat requirement for sorbent regeneration in the amine system. Auxiliary NG boiler efficiency (NGB) This is the efficiency of the auxiliary boiler that uses natural gas as fuel input. It is defined as the ratio of total thermal energy (in the form of steam) delivered by the boiler divided by the total heat energy input (in the form of heating value of the natural gas input). Secondary steam turbine power generation efficiency (ST2) This is the efficiency of the secondary steam turbine added along with the auxiliary NG boiler to generate electrical power. It may be defined as the ratio of electrical energy generated (MWST2) by the steam turbine divided by the total thermal energy (in the form of steam) input from the auxiliary NG boiler. It is assumed that the rest of the thermal energy is contained in the LP exhaust steam from the turbine, which is sent to the reboiler for sorbent regeneration. 3.4. Performance Equations The performance equations define the functional relationships among various key performance parameters. They have been derived as multivariate linear regression equations from the data obtained from the process simulation model runs. Integrated Environmental Control Model - Technical Documentation • 23PDF Image | Amine Based CO2 Capture
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