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Method for determining minimum cooling common engineering requirement of heat exchange network containing non-isothermal phase-change fluid

A technology of phase change fluid and heat exchange network, applied in general control systems, instruments, adaptive control, etc., can solve problems such as inability to correctly estimate limitations

Inactive Publication Date: 2015-09-16
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In order to overcome the limitation that the existing pinch point method cannot correctly estimate the minimum cold utility requirement of a heat exchange network containing a non-isothermal phase-change fluid, the present invention provides a heat exchange network containing a non-isothermal phase-change fluid based on the actual physical properties of the fluid Determination Method of Minimum Cooling Utilities Requirements in Network

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  • Method for determining minimum cooling common engineering requirement of heat exchange network containing non-isothermal phase-change fluid
  • Method for determining minimum cooling common engineering requirement of heat exchange network containing non-isothermal phase-change fluid
  • Method for determining minimum cooling common engineering requirement of heat exchange network containing non-isothermal phase-change fluid

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] refer to Figure 1 ~ Figure 3 , a method for determining the minimum cooling utility requirement for a heat exchange network containing a non-isothermal phase change fluid, comprising the following steps:

[0052] 1) Extract the process parameters and physical property data of the fluid

[0053] The process parameters and physical data of logistics include: composition, flow rate, inlet temperature T in (initial temperature), outlet temperature T out (specified target temperature), enthalpy and specific heat capacity. The method is based on the actual physical properties of the fluid, and adopts the actual temperature-enthalpy physical property relationship of the fluid instead of assuming that the specific heat capacity of the substance is constant.

[0054] 2) Set the minimum heat transfer temperature difference ΔT of the heat exchange network min

[005...

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Abstract

Disclosed is a method for determining the minimum cooling common engineering requirement of a heat exchange network containing a non-isothermal phase-change fluid. Based on the actual physical property of the fluid, through adoption of the actual temperature and enthalpy physical property relationship of the fluid, a distribution relationship of available heat with temperature in the heat exchange network is determined; according to influences of a non-linear physical property on the size and the direction of the available heat of a local temperature region, a whole temperature region is divided into a series of sub regions heat fluxes of which monotonously change with temperature; and then the minimum cooling common requirement of the heat exchange network is determined according to sizes and directions of the accumulated heat fluxes of the various temperature regions. A reliable heat flux calculating result can be obtained, and a condition of the minimum cooling common engineering requirement of the heat exchange network is correctly estimated.

Description

technical field [0001] The invention relates to the design field of industrial heat exchange networks, in particular to a method for determining the minimum cooling public engineering requirements of heat exchange networks containing non-isothermal phase change fluids. Background technique [0002] In an industrial process, in order to meet the technical requirements of the process, some cold fluids are heated to the temperature state specified by the process conditions, while other hot fluids are cooled to the temperature state specified by the process conditions. By reasonably matching these hot and cold streams for heat exchange, we can make full use of the heat of the internal logistics of the industrial process, use the hot fluid to heat the cold fluid, and use the cold fluid to cool the hot fluid, so that the flow reaches the specified temperature And phase state, by recovering the heat inside the system to reduce the consumption of external utilities, this is the role...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 蒋宁徐英杰李韩伟
Owner ZHEJIANG UNIV OF TECH
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