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Waste Heat Recovery Heat Exchanger From Power Generation

Views: 0     Author: Site Editor     Publish Time: 2025-01-20      Origin: Site


Waste Heat Recovery Heat Exchanger From Power Generation


Fins are added to the surface of the tube to increase the heat transfer area. The tube is usually circular and the fins can be round, rectangular, and other shapes, and are secured to the tube by welding, expansion, etc. In power generation waste heat recovery applications, the high temperature waste heat fluid generally flows inside the tube, while the heated medium flows between the fins outside the tube.

Application Scenario: Commonly used to recover waste heat from high temperature gases in the power generation process, especially when the heated medium outside the tube is air, the presence of the fins significantly increases the heat transfer area, which can strengthen the heat transfer process of the fluid outside the tube. For example, in the gas turbine power generation system, the finned tube heat exchanger is utilized to recover the waste heat from the exhaust gas of the gas turbine, to preheat the air used for combustion, and to improve the thermal efficiency of the gas turbine.


Waste Heat Recovery Heat Exchanger From Power Generation


Advantages of waste heat recovery heat exchanger for power generation

Improvement of energy utilization: By recovering the waste heat from the power generation process, such as the heat from steam turbine exhaust and gas turbine exhaust, the heat can be used to preheat the boiler feed water, to heat domestic hot water, or to be used for the heating process in the industrial production process, thus greatly improving the energy utilization rate of the whole power generation system. For example, in a cogeneration system, a waste heat recovery heat exchanger can increase the comprehensive energy utilization rate from 30% - 40% of pure power generation to 70% - 80%.

Reduced environmental pollution: Recovered waste heat reduces the need to burn additional fossil fuels for the same heating purpose, thereby reducing emissions of pollutants such as carbon dioxide and sulfur dioxide. In a medium-sized thermal power plant, for example, thousands of tons of carbon dioxide emissions can be reduced annually if the waste heat from power generation is effectively recovered for use in the heating of surrounding industries.

Significant economic benefits: In addition to the cost reductions brought about by energy savings, waste heat recovery can also create additional economic benefits by providing heat energy (e.g., industrial steam, domestic hot water, etc.) to neighboring users. For example, some cogeneration plants have increased their revenue streams by providing hot water and steam to nearby factories or residential areas.


Key points in the design of heat exchangers for waste heat recovery in power generation

Material selection: Select the appropriate material according to the temperature, pressure, corrosiveness and other characteristics of the waste heat fluid. For high-temperature, high-pressure and corrosive waste heat fluid, it may be necessary to use high-temperature, corrosion-resistant alloy steel or special stainless steel. For example, in the recovery of gas turbine exhaust waste heat containing sulfur compounds, the choice of materials that can resist sulfide corrosion of the heat exchanger.

Calculation of heat transfer area: the heat transfer area needs to be accurately calculated according to the heat requirements of waste heat recovery, the temperature difference between the waste heat fluid and the heated medium, the heat transfer coefficient and other factors. Insufficient heat transfer area will lead to inefficient waste heat recovery, while too large will increase the cost of equipment and floor space.

Fluid flow rate control: reasonable control of waste heat fluid and heated media in the heat exchanger flow rate. Too high a flow rate may lead to too large a pressure drop, increasing the energy consumption of pumps or fans; too low a flow rate will affect the heat transfer efficiency. For example, in the shell-and-tube heat exchanger, the flow rate of the shell-side fluid is generally regulated by the design and arrangement of the folding plate.


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