Non-pump type organic Rankine cycle method and device for power generation

Abstract

The invention discloses a non-pump type organic Rankine cycle method and device for power generation. High-temperature high-pressure working medium steam which is generated by a boiler is used for pressurizing liquid working media and conveying the liquid working media, then liquid working media to be conveyed in a next cycle are pre-pressurized, and energy of the high-temperature high-pressure working medium steam is sufficiently used for improving power generation efficiency of a system. The device comprises the boiler, an expansion machine, a generator, a condenser and a liquid storing device. The liquid storing device comprises two or more liquid storing tanks which are connected in parallel and matched. Each liquid storing tank is respectively communicated with the boiler, the condenser and the other matched liquid storing tank through control valves. The boiler is sequentially connected with the expansion machine, the generator, the condenser and the liquid storing device in series to form a loop, and the steam in the expansion machine expands and does work to drive the generator to generate power. According to the device, non-pump cycle of the system is achieved, the number of moving parts is reduced, and moving performance is more stable and reliable. Energy using of the system is more economical and reasonable, thermal loads of cooling water are reduced, and net power generation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of organic Rankine cycle power generation, and in particular relates to a pumpless organic Rankine power generation cycle method and a device for realizing the method. Background technique [0002] At present, my country's energy situation is severe, and the utilization rate of energy efficiency is low. Low-temperature waste heat with a temperature below 350 °C accounts for about 60% of the total waste heat. For example, in the iron and steel industry, the total waste heat of iron and steel metallurgy reaches 150 million tce / a, while the current recovery level is only 30%. In the cement industry, with the promotion and popularization of the new dry process cement clinker technology across the country, there is a large amount of waste heat below 350-400 °C in the cement production process that cannot be fully utilized. These exhausted and unused heat not only increase the production cost of the enterprise, cause energ...

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Problems solved by technology

[0006] In the above system, in order to meet the pressure of the next cycle of liquid storage, when the liquid storage tank completes the delivery of liquid working fluid, the residual high-temperature and high-pressure working medium vapor enters the condenser without being used and condenses into a low-pressure liquid. The energy of the high-temperature and high-pressure working medium is not fully utilized, which reduces the power generation efficiency of the system; and the high-temperature and high-pressure working medium steam affects the condensation pressure

[0007] In addition, the pump in the above system still needs to consume a certain amount of electric energy, and because it is a moving part, it will reduce the stability of the system operation to a certain extent, restrict the scope of application of the organic Rankine cycle power generation device, and increase the initial investment

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