A design method of channel layout of plate-fin heat exchanger under multiple working conditions based on integral average temperature difference method

Abstract

The invention discloses a method for designing channel arrangement of a plate-fin heat exchanger under multiple conditions based on an integral mean temperature difference process. The method comprises: first, constructing a design model for channel arrangement, fine structure parameters, condition parameters of cold and hot fluid inlets and heat exchanging efficacy of the exchanger based on the integral mean temperature difference process; defining a multi-condition channel arrangement coefficient, and constructing a multi-condition channel arrangement coordination section; using the channelarrangement coordination section as a design domain, and providing, by targeting at the highest quantity of multi-condition weighted heat exchanging, optimal design of plate-fine heat exchanger channel arrangement considering multi-condition design requirement. The method has the advantages that the method is applicable to the channel arrangement design of plate-fine heat exchangers under multipleconditions, the heat exchange process of a super-large plate-fin heat exchanger is enhanced, and energy-saving potential of the exchanger is explored.

Description

technical field [0001] The invention relates to a channel layout design method of a plate-fin heat exchanger, in particular to a channel layout design method for an ultra-large plate-fin heat exchanger under multiple working conditions. Background technique [0002] In the plate-fin heat exchanger, there are many types of hot and cold fluids and a large number of channels. The types of channel layouts increase exponentially with the increase in the number of channels, and the heat transfer of different channel layouts is different. Therefore, the channel layout design is A key issue in the design of plate-fin heat exchangers. [0003] Most of the existing channel layout methods are based on the number of channels for hot and cold fluids, the parameters of the inlet conditions of hot and cold fluids, and the optimal design of channel arrangement based on the two principles of isolated arrangement of cold and hot fluids and local heat load balance. These methods can obtain th...

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Problems solved by technology

However, these methods can only be applied to the design of super-large plate-fin heat exchangers under single working conditions, and cannot be applied to the channel layout design of heat exchangers under multiple working conditions

[0004] Existing ultra-large plate-fin heat exchangers often have complicated operating conditions. For example, the heat exchangers used in large-scale air separation equipment need to adapt to the demand of 80%-110% oxygen production load changes. The heat exchangers in the production of ethylene enterprises The amount of heat transfer needs to be adjusted adaptively according to the change of output. Therefore, how to design the channel layout considering the design requirements of complex working conditions is the key to enhancing heat transfer and tapping the energy-saving potential of super-large plate-fin heat exchangers.

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