tailieunhanh - Process Engineering Equipment Handbook Episode 3 Part 3

Tham khảo tài liệu 'process engineering equipment handbook episode 3 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Pulp and Paper P-213 TABLE P-25 Simulation Results for the Hybrid System and the Tomlinson Boiler Power Production Power Output MW Thermal Efficiency Gas turbine Steam turbine Reference case Low heat demand case Biomass gasifier malfunction Black liquor gasifier malfunction Tomlinson boiler Steam Production Saturated Steam Produced in t h Pressure in bar 3 5 12 Reference case Low heat demand case Biomass gasifier malfunction Black liquor gasifier malfunction Tomlinson boiler Steam demand 28 235 87 Production Minus Demand t h is surplus and - is deficit Reference case Balance Balance Balance Low heat demand case Balance Biomass gasifier malfunction Balance Black liquor gasifier malfunction Balance1 Balance1 1. Steam demand is lower in this case. SCondensing backpressure turbine CHP turbine Gas turbine FIG. P-223 Power output for different scenarios. Source Ahlroth and Svedberg. I Saturated 12 bar steam i Saturated 5 bar steam Sootblow steam Steam for power production Saturated 3 bar steam FIG. P-224 Steam production for different scenarios. Source Ahlroth and Svedberg. P-214 Pulsation Dampeners It is therefore noticeable that in all studied cases with a hybrid energy system instead of a conventional one the process steam demand for the pulp mill is satisfied at all points of operation except when the biomass gasifier suffers a malfunction. The introduction of the hybrid-energy system with black liquor gasification as a unit operation enables an increase in pulp production as planned. The thermal efficiency of the hybrid system is 33 percent for the reference case based on the LHV for the gasified fuels shown in Table P-24. Compared to modern gas turbine combined cycle plants with efficiencies up to nearly 60 percent this might seem as mediocre performance. It should be kept in mind however that the fuel used is difficult to refine .