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Comparison of biomass gasification power generation systems with direct combustion boiler power generation and diesel power generation (on a 500Kw basis) Serial No. NO. Comparison items Gasification power generation system Direct combustion boiler with turbine generator set Diesel generator 1 Fuel and its cost The fuel cost for wood chips is 0; only local transportation/lifting costs apply. However, if the fuel is irregularly discarded wood, it is recommended to use a crusher to grind it into pieces with a diameter of 15–20 mm. Based on a price of 50.00 yuan per ton for wood chips, the fuel cost associated with wood chips is 0; only the costs related to local transportation and handling apply. However, if the fuel is irregularly discarded wood, it is recommended to use a crusher to grind it into pieces with a diameter of 15–20 mm. Based on a price of 50.00 yuan per ton for wood chips, the price of diesel and other fuels is very high. Calculated at approximately 7,000.00 yuan per ton. 2 Fuel consumption per unit of power: 1.50 kg/kW·h, 1.80 kg/kW·h, 0.10 kg/kW·h. 3 Fuel cost per unit of power: 0.075 yuan/kW·h, 0.09 yuan/kW·h, 0.70 yuan/kW·h. 4 Fuel cost for 500kW: 37.50 yuan/kW·h, 45.00 yuan/kW·h, 350.00 yuan/kW·h (too high). 5 Operating time of 6000 hours per year: 225,000 yuan, 270,000 yuan, 2,100,000 yuan (too high). 6 Energy conversion process: ① Solid chemical energy → Gas chemical energy; ② Gas chemical energy → Kinetic energy of internal combustion engine; ③ Kinetic energy of internal combustion engine → Electrical energy from generator. ① Chemical energy → Thermal energy; ② Thermal energy → Steam thermal energy; ③ Steam thermal energy → Kinetic energy of turbine; ④ Kinetic energy of turbine → Electrical energy from generator. ① Chemical energy → Kinetic energy of internal combustion engine; ② Kinetic energy of internal combustion engine → Electrical energy from generator. 7 Overall power generation efficiency: >25%, ≈20%, over 30%. 8 Water requirements: ① Water used for system cleaning and dust removal can be recycled. A small amount of supplementation is sufficient on regular days ； ② Water for generator cooling is reused with only minor replenishment. ① Water for steam consumption: approximately 300 kg/h, based on the boiler’s evaporation rate ； ② Water for generator cooling is reused with only minor replenishment. None. 9 If the raw water is groundwater, it must undergo filtration, softening, desalination, or reverse osmosis treatment to ensure steam quality and the safe operation of the system. None. 10 Power consumption for system operation: Total installed motor capacity ≈ 50 Kw; Total installed motor capacity ≈ 75 Kw. None. 11 Percentage of power consumption for internal use compared to total power generated: 10%, 15%. None. 12 Requirements for operator training: Simple and reliable operation – professional training for operators required; Complex system – professional training for operators required; Simple and quick to use. 13 Operation, maintenance, and repairs: ① Apply grease to motors; ② Clean rotary vacuum pumps to remove tar; ③ Clean components such as pistons in gas engines to remove tar; ④ Regularly clean the circulation tank and add a small amount of water. ① Apply grease to motors; ② Maintain steam boilers and pipelines; ③ Maintain turbines, such as by replacing blades; Clean components such as pistons in diesel generators to remove tar. 14 Repair time: Usually 2–3 days of maintenance per month, no major repairs required. Regular maintenance is required in accordance with the “Boiler Safety Technical Inspection Regulations” and “Turbine Safety Technical Inspection Regulations”; ongoing maintenance and repairs are needed throughout the year. Usually 2–3 days of maintenance per month, no major repairs required. 15 Dust emissions and environmental impact: No dust emissions; ash can be collected and used as carbon black or fertilizer. Significant dust emissions; ash is not recycled. None. 16 Construction period: 6 months, including 4 months for equipment delivery and 2 months for installation and commissioning; 3 months. Among them: the delivery time for the equipment is 2 months, and installation and commissioning take about 1 month. The investment cost for System 17 includes infrastructure costs; the equipment investment amounts to 4.8 million yuan, with low infrastructure and maintenance costs. In the case of System 18, the equipment investment is 4.3 million yuan, resulting in higher infrastructure and maintenance costs. There is less investment required in this case, leading to lower infrastructure and maintenance costs. 18: Cost-effectiveness – High cost-effectiveness with a short investment recovery period; high cost-effectiveness and a relatively short investment recovery period; low cost-effectiveness