Two-stage organic Rankine cycle combined heat and power system with preferential heat supply function and regulation and control method

Abstract

The invention discloses a two-stage organic Rankine cycle combined heat and power system with a preferential heat supply function and a regulation and control method, and belongs to the technical field of energy. The two-stage organic Rankine cycle combined heat and power system comprises a waste heat exchange unit, a heat conduction oil distribution and control unit, a heat supply unit, a first organic Rankine cycle power generation unit and a second organic Rankine cycle power generation unit, and intermediate-temperature smoke waste heat energy can be subjected to first-stage heat exchangeto heat conduction oil through the waste heat exchange unit. The heat conduction oil is distributed to the heat supply unit and the first organic Rankine cycle power generation unit through the heat conduction oil distribution and control unit, the heat supply unit and the first organic Rankine cycle power generation unit work in parallel, and smoke waste heat obtained after heat exchange with theheat conduction oil enters the second organic Rankine cycle power generation unit for secondary power generation. High-temperature heat obtained through first-stage heat exchange preferentially meetsthe electric load of a heat supply system through the heat conduction oil distribution and control system, the purpose of preferentially and stably supplying heat is achieved, two-stage power generation is conducted on residual heat through two organic Rankine cycle power generation systems, and the better combined heat and power supply proportion is achieved.

Description

technical field [0001] The invention belongs to the field of energy technology, and relates to a two-stage organic Rankine cycle combined heat and power system with priority heat supply and a control method. Background technique [0002] The recovery and utilization of industrial waste heat is of great significance. Cogeneration technology uses heat exchange to recover heat energy and at the same time convert part of the heat energy into electrical energy, which is the main process in waste heat recovery. The Organic Rankine Cycle (ORC) uses low-boiling organic working fluids for thermal conversion. In terms of recovering low-temperature waste heat below 200 °C, the ORC has more advantages than the Steam Rankine Cycle. And the ORC system has the advantages of compact structure, convenient start and stop, good load adaptability and low maintenance cost. The ORC low-temperature waste heat power generation technology is relatively mature, and there have been many reports on th...

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Problems solved by technology

[0003] In order to ensure the smooth operation of the ORC system, most waste heat recovery systems of combined heat and power adopt a priority power supply mode, which will cause fluctuations in heating supply and cannot meet specific changing heating demand

In addition, flue gas heat sources may also fluctuate in winter and summer, which requires the waste heat recovery and utilization system to have certain adjustment capabilities

However, the existing waste heat recovery and utilization systems have not yet seen relevant reports that can achieve the purpose of priority heat supply through reasonable adjustment of heat sources

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