Method for constructing heat exchange network based on exergy consumption cost

Abstract

The invention discloses a method for constructing a heat exchange network based on exergy consumption cost. The method comprises the following steps of: 1) extracting logistics data, drawing a balanced composite curve on a temperature enthalpy graph, dividing an enthalpy interval, constructing a super-structural model of the heat exchange network, optimizing matched structures among fluids of all sub-enthalpy intervals by using minimized investment cost as a target function, and solving a heat load and an area allocation matrix; 2) solving heat transfer exergy loss among all enthalpy intervals by a sectional integration method in reference to the formula (1), and calculating flow exergy loss of a matched unit in reference to the formula (2); and 3) solving the optimal heat transfer temperature difference of the heat exchange network and a corresponding network structure by using minimized annual total cost as the target function in reference to the formula (3). In the invention, the method for constructing the heat exchange network based on the exergy consumption cost, which is high in reliability and solving efficiency, is provided.

Description

technical field [0001] The invention relates to a method for constructing a heat exchange network. Background technique [0002] The heat exchange network is used to recover the energy available in the system and reduce the demand for external public works. It is one of the main components of the process industry such as chemical industry and oil refining. Its design level directly determines the energy consumption and economy of the process system . [0003] The optimization and synthesis of the heat exchange network is to solve the heat exchanger network structure with the minimum equipment investment and operation costs under the premise of heating or cooling each process stream from the initial temperature to the specified target temperature. [0004] The economic index based on the existing comprehensive method of heat exchange network consists of two parts: energy consumption cost and equipment investment cost. The traditional method uses the consumption of cooling an...

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Problems solved by technology

[0005] In order to overcome the shortcomings of poor reliability and low solution efficiency of existing heat exchange network synthesis methods, the present invention adopts thermoeconomic objective function based on exergy loss cost, step-by-step optimization technology based on superstructure, and heat transfer exergy based The flow exergy loss correlation solution method of loss makes the design scheme simple and easy, and provides a heat exchange network construction method based on exergy consumption cost with good reliability and high solution efficiency

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