Medium-and-low temperature ground heat and biomass gas combined power generation system and power generation cost calculating method

Abstract

A medium-and-low temperature ground heat and biomass gas combined power generation system is characterized in that a working medium evaporator is connected with a working medium superheater, a prime motor and a power generator of a gas boiler, the prime motor is communicated with a working medium condenser and a working medium storage tank, and the working medium storage tank is communicated with a working medium preheater of the gas boiler through a working medium booster pump; a production well is communicated with a ground heat water processing device and the working medium evaporator, and the working medium evaporator is communicated with a second inner heating pipe and a first inner heating pipe; the first inner heating pipe is communicated with an inverted well, an underground heat storage part and the production well; biomass is communicated with an acidification hydrolysis tank and communicated with a biogas residue fermentation tank and biogas fertilizer through a biogas residue circulation pump, and the biogas residue fermentation tank is communicated with a gas storage tank through a first gas booster pump; the acidification hydrolysis tank is communicated with an anaerobic digestor through an organic acid circulation pump; the anaerobic digestor is communicated with the gas storage tank and a combustor in the gas boiler through a second gas booster pump; and an anaerobic digester filling module is arranged in the anaerobic digestor. A power generation cost calculating method for the medium-and-low temperature ground heat and biomass gas combined power generation system is provided.

Description

technical field [0001] The invention relates to the technical field of multiple renewable energy combined power generation, and relates to a medium-low temperature geothermal and biomass gas combined power generation system and a power generation cost calculation method. Background technique [0002] As a kind of natural energy, geothermal energy has large reserves (about 170 million times of global coal reserves), low-carbon, clean, and can be directly used. Continuous and stable supply. my country's proven geothermal resources are equivalent to 2,000 trillion tons of standard coal, accounting for 40% of the world's proven geothermal resources, but most of them belong to medium temperature (150-90°C) and low temperature (<90°C) geothermal resources. Because the enthalpy drop of the working medium is too small and the thermal efficiency is very low (only 3% to 6%), it cannot be directly used for steam power cycle power generation, so it is discarded. [0003] In addition...

AI Technical Summary

Problems solved by technology

my country's proven geothermal resources are equivalent to 2,000 trillion tons of standard coal, accounting for 40% of the world's proven geothermal resources, but most of them are medium-temperature (150-90°C) and low-temperature (<90°C) geothermal resources. Because the enthalpy drop of the working medium is too small and the thermal efficiency is very low (only 3% to 6%), it cannot be directly used for steam power cycle power generation, so it is abandoned.

[0003] In addition, biomass energy is a renewable energy with abundant reserves, which can be co-combusted with coal to generate electricity to replace part of the fossil energy. The disadvantages of being used as power generation energy are: low energy density, and the utilization rate of direct combustion is only 10%, the area of ​​straw utilization is limited to arable areas, and the cultivated land area of ​​our country only accounts for 12.68% of the land area; the energy density is high dedicated energy plants compete with food crops for land

Images