Heat exchange device for condensing VOCs gas and working method

Abstract

The invention discloses a heat exchange device for condensing VOCs gas and a working method. The heat exchange device comprises a vertically arranged shell and a heat exchange mechanism arranged in the shell; a flow equalizer for uniformly feeding a refrigerant into the heat exchange mechanism is arranged at the upper end of the shell; an upper pipe plate and a lower pipe plate which are used for fixing the heat exchange mechanism are arranged in the shell; a heat exchange cavity is formed between the upper pipe plate and the lower pipe plate; the heat exchange mechanism comprises a plurality of layers of heat exchange units distributed in a layered manner around a longitudinal center line; each layer of heat exchange unit consists of a plurality of heat exchange pipes; and the heat exchange pipes in the adjacent heat exchange units are screwed in opposite directions. The heat exchange device is compact in structure and corrosion-resistant; efficient heat exchange of two fluids with high temperature difference in the same heat exchange device is guaranteed; and the heat exchange device can be widely applied to VOCs recovery treatment devices in such industries as car and train loading, wharf shipping, storage and transportation tank yards and biological pharmacy.

Description

technical field [0001] The invention relates to a heat exchange device, in particular to a heat exchange device and a working method for condensing VOCs gas. Background technique [0002] The VOCs gas condensation recovery technology provides a low-temperature cold field by the Freon refrigeration system. Freon evaporates and absorbs heat in the heat exchange tube, and the VOCs gas outside the tube releases heat and condenses to cool down, and condenses and separates oil for recovery, thereby realizing VOCs gas purification and emission. Conventional condensing oil separation heat exchangers are in the form of vertical aluminum plate-fin heat exchangers and horizontal shell-and-tube heat exchangers. The vertical aluminum plate-fin heat exchanger is made of aluminum alloy, with high heat transfer coefficient, small channel pores, large heat transfer area, and small footprint, but it is not resistant to sulfur corrosion such as hydrogen sulfide and mercaptan sulfide. The ice-...

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Problems solved by technology

The ice-melting channel of the horizontal shell-and-tube heat exchanger is large, and the stainless steel heat exchange tube is resistant to sulfur corrosion, but the Freon horizontal lower side enters the upper side, and there is a dead angle in the oil return; the gas channel is a baffle channel, and there is a vortex dead angle, which affects the part Heat transfer effect

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