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Economic model predictive control method for organic Rankine cycle

A Rankine cycle and economic model technology, applied in mechanical equipment, steam engine devices, machines/engines, etc., can solve problems such as non-optimal, unreachable, and difficult to obtain satisfactory control quality of optimal system operating parameters, and improve timeliness sexual effect

Active Publication Date: 2020-08-07
ZHEJIANG UNIV
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Problems solved by technology

However, when the waste heat is very unstable, the supervisory control scheme is not easy to achieve effective control, especially in the process of transient changes in waste heat conditions, it is difficult to obtain satisfactory control quality
At the same time, the supervisory control scheme does not consider the dynamic characteristics of the system in the process of optimizing the operating parameters of the system at the upper level, and the obtained optimal system operating parameters may be non-optimal or unreachable

Method used

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  • Economic model predictive control method for organic Rankine cycle
  • Economic model predictive control method for organic Rankine cycle
  • Economic model predictive control method for organic Rankine cycle

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Embodiment Construction

[0063] The economic model predictive control method of the organic Rankine cycle of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0064] The method of the invention is applied to the control of the organic rankine cycle under the drastic change of the waste heat working condition. The structure of the organic Rankine cycle is as follows figure 1 As shown, it is mainly composed of five parts: evaporator 1, expander 2, condenser 3, liquid storage tank 4 and booster pump 5, and R245fa is used as the circulating working fluid (ie organic working fluid). The liquid working medium absorbs heat from the heat source in the evaporator 1 and becomes a high-temperature and high-pressure gaseous working medium, and then expands in the expander 2 to perform work, turning heat energy into mechanical energy. The exhaust gas after expansion is condensed by the condenser 3 and becomes a liquid working medium a...

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Abstract

The invention discloses an economic model predictive control method for organic Rankine cycle. The method comprises the following steps of establishing a mechanism model of the organic Rankine cycle;performing order reduction processing on the mechanism model according to the speed of the dynamic characteristics of the system state variable to obtain a simplified model; setting a control quantityand constraint conditions, and establishing an economic model prediction controller by taking the integral of the net output power of the organic Rankine cycle as an optimization target based on thesimplified model; and converting the economic model prediction controller, and solving the converted economic model prediction controller to obtain an optimal control quantity so as to control the organic Rankine cycle. According to the method, the calculated amount is small, the organic Rankine cycle can be effectively controlled under violent fluctuation of the waste heat working condition, thenet output power of the organic Rankine cycle is improved, and deep utilization of waste heat is achieved.

Description

technical field [0001] The invention relates to the technical field of organic Rankine cycle control, in particular to an economic model predictive control method for the organic Rankine cycle. Background technique [0002] Energy is the foundation of national economic development, but the rapid consumption of traditional petrochemical energy has exacerbated the energy crisis in today's society. In cement, chemical, steel, petrochemical, metal smelting and other industrial fields, various furnaces, reactors, boilers and other industrial devices discharge a large amount of medium and low temperature waste heat in the form of high-temperature waste water, waste gas and waste slag during the production process. Reasonable recovery and utilization of these waste heat will effectively promote my country's energy conservation and emission reduction work, and alleviate the pressure of energy shortage. Organic Rankine cycle (ORC) is a promising waste heat recovery technology due to ...

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Application Information

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IPC IPC(8): F01K13/02
CPCF01K13/02
Inventor 谢磊吴夏来陈启明
Owner ZHEJIANG UNIV
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