Heat pipe waste heat boiler (evaporator) series

Heat pipe waste heat boiler (evaporator) series

1. Working principle of finned tubes

To understand the heat transfer principle of finned tubes, let's first understand what heat transfer coefficient is. The heat transfer coefficient refers to the heat transfer capacity per unit temperature difference and per unit heat transfer area, which can reflect the heat transfer capacity between the fluid and the wall.

Finned tubes are heat exchangers composed of circular or smooth tubes, so how can we improve the heat transfer of circular tubes? One of the most effective methods is to use an extended surface on the outer surface of the pipe, which is the smoke side, to make a finned pipe. Assuming that the actual heat transfer area of the finned tube is several times that of the original outer surface area of the light tube, although the heat transfer coefficient of the flue gas is still very low, the heat transfer effect reflected on the outer surface area of the light tube will greatly increase, thereby enhancing the entire heat transfer process. With a constant total heat transfer, the metal consumption of the equipment will be reduced, and the economy will be improved.

2. Application examples of finned tubes

(1) Heat pipe air preheater series

Application scenario: Absorbing waste heat from flue gas, heating combustion air to reduce fuel consumption, improve combustion conditions, and achieve energy-saving goals; It can also absorb waste heat from the flue gas and be used to heat other gas media such as coal gas.

(2) Heat pipe economizer series

Application scenario: Absorbing heat from flue gas to heat water supply. The heated water can be returned to the boiler (as an economizer) or used alone (as a water heater) to improve energy utilization and achieve energy-saving goals.

(3) Heat pipe waste heat boiler (evaporator) series

Application scenario: Heat pipes are used as heat transfer components to absorb the waste heat of flue gas at higher temperatures and generate steam. The generated steam can be combined into the steam pipeline network (to reach the pipeline pressure), or used for power generation (with large steam volume and stable heat source) or other purposes. For steel mills, petrochemical plants, and industrial kilns, this is the most popular form of waste heat utilization.

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