Abstract

The article describes the design of a heat exchanger used for biomass combustion. The design takes into account simple maintenance of the exchanger, low input costs of construction and the highest possible efficiency. In the design is used the tubular type of heat exchanger. The construction consists of a tubular part - flue gas part, inter-tube space - heat transfer medium space. The output of the numerical model, CFD model is the heat transfer coefficient, heat exchanger power and final comparison of CFD and numerical model outputs.

Highlights

  • We know various divisions of types of exchangers in terms of construction, type of media used, according to the purpose of use, the meaning of the flow of heat transfer media

  • In our case, we decided for a tubular type exchanger. This type of exchanger enables the introduction of continuous cleaning, and simple maintenance, when even after equipment failures, it is possible to replace individual parts of the equipment that are exposed to the adverse corrosive effects of biomass flue gases [1, 2]

  • The flue gas properties are calculated for an average temperature of 495 °C, flow of 207 m3h-1

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Summary

Numerical design of heat exchanger

We know various divisions of types of exchangers in terms of construction, type of media used, according to the purpose of use, the meaning of the flow of heat transfer media. In our case, we decided for a tubular type exchanger This type of exchanger enables the introduction of continuous cleaning, and simple maintenance, when even after equipment failures, it is possible to replace individual parts (pipes) of the equipment that are exposed to the adverse corrosive effects of biomass flue gases [1, 2]. Where: Q – power of heat exchanger [W], k – heat transfer coefficient [W.m-1.K-1], ∆t – mean logarithmic temperature gradient for counter flow [°C], S – area of heat exchanger [m2]. It is necessary to know the properties of individual heat transfer media at the points of their mean temperatures [4].

Pipe area – flue gas
Inner pipe space – water
Final design of heat exchanger
CFD design of heat exchanger
Comparison of results from numerical model

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