Organic Rankine Cycle generation device for low-pressure diffused steam and use method for same

Abstract

The invention relates to the field of engines driven by fluids and specifically relates to an Organic Rankine Cycle generation device for low-pressure diffused steam and a use method for the same. The Organic Rankine Cycle generation device for the low-pressure diffused steam comprises a heat collector (1), an evaporator (2) and a condenser (6) and is characterized by comprising an energy storage working medium pump (3), a water pump (4), an organic working medium condensation pump (5) and a screw expander (7); and the evaporator (2), the organic working medium condensation pump (5), the condenser (6) and the screw expander (7) compose a generator set system. The use method for the Organic Rankine Cycle generation device for the low-pressure diffused steam is characterized in that the method is implemented at the successive steps that heat exchange is carried out between the low-pressure diffused steam and an energy storage working medium; heat exchange is carried out between the energy storage working medium and an organic working medium; and working medium steam works for the screw expander (7). The device provided by the invention has the advantages of high thermal energy use ratio and high adaptability.

Description

technical field [0001] The invention relates to the field of fluid-driven engines, in particular to an organic Rankine cycle power generation device for low-pressure steam release and its application method. Background technique [0002] The Rankine cycle refers to an ideal cycle process using water vapor as a working medium, which mainly includes isentropic compression, isobaric heating, isentropic expansion, and isobaric condensation processes. The Rankine cycle absorbs heat from the outside, and the closed-loop working medium is usually heated by water to do work, which is used in the power cycle of the steam device. [0003] At present, the organic Rankine cycle power generation system is widely used in the recovery of medium and low temperature waste heat. It has the advantages of mature technology, stable operation, and frequent start and stop. Its power generation system mainly includes: working medium pump, evaporator (waste heat heat exchange device) , expander, co...

AI Technical Summary

Problems solved by technology

[0004] However, at present, the organic Rankine cycle power generation system is mainly used in stable flue gas and stable steam systems, but it is rarely used in fluctuating medium and low temperature flue gas waste heat recovery and low-pressure steam systems. 1. In the steam system, such as the low-pressure steam pipe network of the whole plant in the iron and steel industry to release steam, the medium and low temperature waste heat resources with large fluctuations, and other processes to release steam, etc., due to the fluctuation of production rhythm, the steam consumption and steam production All fluctuate accordingly, and it is difficult to use, especially the irregular steam release, the number of releases and the amount of release are difficult to control, most of the release low-pressure steam is generally below 1.0MPa, the temperature is saturated steam or slightly superheated steam, and the expansion screw Although the machine can start and stop quickly and adapt to local fluctuations in temperature and flow, in the case of large-scale fluctuations, it will inevitably affect the selection of unit capacity and system design, and the frequent start and stop of the unit will increase the difficulty and complexity of operation management. , the utilization of waste heat resources cannot be maximized, and it will also affect the service life of the entire system

Therefore, due to the difficulties of large fluctuations and irregularities, it is difficult to utilize waste heat, and the controllability is relatively poor. It is difficult to design a suitable utilization plan, which will inevitably lead to a large waste of waste heat resources.

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