Heat pipe air pre-heater capable of preventing dew point corrosion

Abstract

The invention discloses a heat pipe air pre-heater capable of preventing dew point corrosion. The heat pipe air pre-heater comprises a box body, wherein a partition board dividing an inner cavity of the box body into a cold flow cavity and a hot flow cavity is arranged in the box body, and the cold flow cavity and the hot flow cavity are vertically arranged and are not connected with each other. Heat pipes are inserted onto the partition board in penetrating mode, the upper sections of the heat pipes are located in the cold flow cavity, and the lower sections of the heat pipes are located in the hot flow cavity. Spiral fins are connected onto the outer surfaces of all the heat pipes, the total area of the fins on the upper sections of the front two rows of heat pipes located close to an output port at the right end of the hot flow cavity is smaller than that of the fins on the lower sections of the front two rows of heat pipes, the total area of the fins on the upper sections of the last two rows of heat pipes located close to an input port at the left end of the hot flow cavity is larger than that of the fins on the lower sections of the last two rows of heat pipes, and the total areas of the fins on the upper sections and the lower sections of the other heat pipes are identical. The heat pipe air pre-heater can effectively reduce dew point corrosion and high-temperature pipe explosion, is provided with a heat exchange device with high heat exchange efficiency and a self ash removal function, and has the advantages of being efficient, safe and low in cost.

Description

[0001] technical field [0002] The invention relates to the field of heat exchange devices of chemical equipment, in particular to a heat pipe air preheater for preventing dew point corrosion applied to flue gas waste heat recovery technology. Background technique [0003] The heat pipe air preheater is widely used in flue gas waste heat recovery technology due to its high-efficiency heat transfer, safety and reliability. However, the traditional heat pipe heat exchangers used in flue gas waste heat recovery have the following two main disadvantages: 1. Dew point corrosion is easy to occur. When the flue gas temperature decreases and the pipe wall temperature is lower than the dew point, the water vapor in the flue gas will Condensation on the pipe wall, sulfur dioxide, sulfur trioxide and other acid gases in the flue gas dissolve in the water to form an acid solution that corrodes the pipe wall, causing the heat pipe to break and fail. This is the most fatal shortcoming of...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the existing heat pipe heat exchangers, which are prone to dew point corrosion, pipe bursting, and easy dust accumulation, the present invention provides a heat pipe air that reduces dew point corrosion and pipe bursting, has good heat transfer performance, and has strong self-cleaning ability. Preheater

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