Biomass and geothermal energy complementary organic Rankine cycle distributed energy system

Abstract

The invention discloses a biomass and geothermal energy complementary organic Rankine cycle distributed energy system which comprises a biomass combustion subsystem, an organic Rankine cycle power generation subsystem, a flue gas distribution and refrigeration subsystem and a ground source heat pump subsystem. Main equipment comprises a biomass combustion chamber, a cyclone dust collector, a second heat exchanger, a first evaporator, a steam turbine, a first condenser, a circulation pump, a flue gas distributor, a flue gas type lithium bromide refrigerator, a water pump, an underground heat exchanger, a second evaporator, a compressor, a second condenser, a throttling valve and a first heat exchanger. Two kinds of energy technologies of biomass organic Rankine cycle and the ground source heat pump are integrated, and two kinds of energy are efficiently utilized through system complementary integration. The total energy efficiency of the system reaches up to 70% or more, and a great significance is achieved for energy system structure optimization, output of various kinds of energy products and environmental and sustainable development.

Description

technical field [0001] The invention relates to the technical field of utilization of biomass and geothermal energy, in particular to a complementary organic Rankine cycle distributed energy system of biomass and geothermal energy. Background technique [0002] In recent years, with the continuous development of the social economy and the continuous improvement of people's living standards, the demand for energy is increasing day by day. Among them, fossil fuels, as the main energy consumption, release a large amount of pollutants and cause serious damage to the ecological environment. Therefore, the search for cleaner and more efficient energy is beneficial to alleviate the problems caused by fossil energy, among which renewable energy is considered as a potential substitute for fossil energy and has received widespread attention. [0003] Shallow geothermal energy refers to thermal energy resources whose temperature below the surface is generally lower than 25°C and has d...

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Problems solved by technology

At present, the main problems in the research of energy systems based on biomass and shallow geothermal energy utilization in the existing design concepts and implementation schemes are: 1) The utilization of renewable energy is relatively single, and the existing coupling methods lack integration depth; 2) Cogeneration The flue gas utilization of the system lacks a certain rationality, which leads to a large exergy loss in the waste heat utilization process; 3) The output product ratio of the combined cooling, heating and power generation system is single, lacking certain flexibility and adjustability; 4) Single ground source heat pump operation The COP is low, resulting in a large energy loss in the thermal process of the heat pump

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