Low temperature thermal energy utilization system in dual pressure endothermic non-azeotropic organic flash-rankine cycle

Abstract

The invention discloses a dual-pressure heat-absorbing non-azeotropic organic flash-Rankine cycle medium and low temperature heat energy utilization system, which includes a low-pressure stage preheater, a high-pressure stage working medium pump, a high-pressure stage preheater, a high-pressure stage throttle valve, High-pressure stage gas-liquid separator, high-pressure stage turbine, low-pressure stage throttle valve, low-pressure stage gas-liquid separator, low-pressure stage evaporator, low-pressure stage turbine, condenser, low-pressure stage working medium pump, cooling water pump and cooling tower, They constitute the first organic rankine cycle pipeline, the first organic flash circulation pipeline, the second organic rankine cycle pipeline, the second organic flash circulation pipeline and the cooling water circulation pipeline, which can expand the working medium The range of selection can realize the complementary advantages of different working fluid components, so that the temperature matching between the cycle and the heat / cooling source can be improved, the cycle () loss can be reduced, and the second organic Rankine cycle and the second organic flash cycle can be used to recover The residual heat of the saturated liquid at the outlet of the flash evaporator can avoid the energy loss caused by the direct interception of the saturated liquid.

Description

technical field [0001] The invention relates to the technical field of energy utilization, in particular to a dual-pressure endothermic non-azeotropic organic flash evaporation-Rankine cycle medium and low temperature heat energy utilization system. Background technique [0002] In recent years, with the rapid development of China's economy, my country's total energy consumption has grown rapidly. In 2017, China's total energy consumption reached 4.49 billion tons of standard coal. However, my country's energy consumption is still dominated by fossil fuels such as coal. The proportion of consumption accounted for more than 60% of the total energy consumption. Fossil fuels are non-renewable energy sources, and the large-scale use of fossil fuels emits a large amount of CO into the atmosphere. 2 , SO 2 , NO x Such harmful gases lead to global warming, air pollution, and aggravated the energy crisis, seriously affecting social and economic development and people's health. Th...

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Problems solved by technology

Generally speaking, most of the renewable energy and industrial waste heat in my country belong to the medium and low temperature waste heat with a temperature lower than 200 °C. Due to the significant difference between the thermal power conversion characteristics and the conventional power cycle, the utilization of these medium and low temperature heat energy is not currently available. full

[0004] Traditional methods of utilizing medium and low temperature heat sources, such as organic Rankine cycle, organic flash cycle, etc., can effectively utilize medium and low temperature heat sources to a certain extent, but because these cycles are often in the heat / The temperature matching problem in the heat exchange process of the cold source is not good, so there is a huge loss, resulting in a waste of energy; in addition, the traditional organic flash cycle often directly sends the intercepted saturated liquid to the condenser for condensation, which also causes a large loss

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