Medium-low temperature geothermal power generation unit with absorbing temperature-increasing system

Abstract

The invention discloses a medium-low temperature geothermal power generation unit coupled with a Kallina cycle. The medium-low temperature geothermal power generation unit is structurally characterized in that a high-temperature heat regenerator, a generator, a separator, a turbine low-temperature heat regenerator and a condenser are in parallel connection with a first throttling valve between the high-temperature heat regenerator and the low-temperature heat regenerator to form a Kalina geothermal power generation system, wherein the high-temperature heat regenerator, the generator, the separator, the turbine low-temperature heat regenerator and the condenser are sequentially connected in series. A second condenser, a solvent pump, an evaporator, a throttling valve and an absorber are sequentially connected in series to form an absorbing temperature-increasing system. The throttling valves are connected to the separator, the absorber is connected with the high-temperature heat regenerator to ensure that the absorbing temperature-increasing system and the absorbent geothermal power generation are combined into the medium-low temperature geothermal power generation unit. The medium-low temperature geothermal power generation unit can generate absorbing temperature of about 100 DEG C, and reduces the exhaust temperature of geothermal wastewater to about 60 DEG C so as to achieve the purpose of improving the power generation efficiency of the unit by using low-level geothermal energy. According to the invention, working medium types and state parameters are coincident to the Kalina system without massively adjusting various items of parameters of the traditional system.

Description

technical field [0001] The invention belongs to utilization of geothermal resources, in particular to a medium-low temperature geothermal power generation device coupled with a Kalina cycle. Background technique [0002] Geothermal power generation belongs to new energy utilization. At present, the use of medium and low temperature geothermal energy for power generation is mainly based on the Rankine cycle, such as the organic Rankine cycle (ORC), water vapor expansion cycle, etc. The Kalina cycle is the use of NH 3 -H 2 O solution is used as the working medium, and the concentration of the working medium is changed by fractional distillation, and the technology of absorbing geothermal energy for power generation has a cycle efficiency that is 20%-40% higher than that of the ORC cycle. The Kalina cycle is used for medium and low temperature geothermal power generation. The temperature of the geothermal water source is required to be between 200-120°C, while the temperatur...

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Problems solved by technology

When the geothermal water discharge temperature is lower than 80°C, the Kalina cycle is used. The problem is that the evaporation pressure of the ammonia solution corresponding to the lower geothermal water discharge temperature is also low, and the inlet pressure of the steam turbine decreases, resulting in The efficiency of cycle power generation decreases; in addition, when the temperature of geothermal water is low, the heat exchange temperature difference of the heat exchange equipment in the system decreases, and increasing the heat exchange area will lead to an increase in system investment, resulting in a decrease in the economy of the power generation system

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