Ash deposition resistance and acid dew corrosion resistance heat exchanger accurate in positioning and easy for side leakage

Abstract

The invention discloses an ash deposition resistance and acid dew corrosion resistance heat exchanger accurate in positioning and easy for side leakage. The heat exchanger comprises a support frame, three-wing connectors connected to the support frame, 8-shaped blocks connected between the adjacent three-wing connectors through hanging hooks, and fluoroplastic heat exchange pipes penetrating through the 8-shaped blocks to form a netty heat exchange grid. The heat exchanger adopts the three-wing connectors and the 8-shaped blocks with simple and reasonable structures to fix and position according to characteristics of fluoroplastic pipes; the complex grid structure of the fluoroplastic pipes can be quickly and conveniently installed, is accurately and conveniently positioned, and overcomes fixation of traditional fluoroplastic pipes through bending insertion in positioning grids to prevent more bending positioning installation; when hot smoke continuously passes through, the fluoroplastic pipes cannot generate bending marks after being softened; and cooling water in the fluoroplastic pipes is smoothly circulated, so that the heat exchange efficiency is improved, and the service life of the fluoroplastic pipes is prolonged.

Description

technical field [0001] The invention belongs to the field of heat exchange equipment, and in particular relates to a heat exchanger with accurate positioning and easy side leakage, which is resistant to dust deposition and acid dew corrosion. Background technique [0002] On thermal power plant boilers or other industrial boilers, there is a tail gas waste heat recovery system for flue gas waste heat recovery. In the tail gas waste heat recovery system, a flue gas heat exchanger is generally installed at the entrance of the wet flue gas desulfurization tower. The flue gas heat exchanger recovers the waste heat of the flue gas. As the core equipment of the flue gas waste heat recovery system, the flue gas heat exchanger determines the performance of the waste heat recovery system. Flue gas waste heat recovery is of great significance, because flue gas waste heat recovery can not only utilize the waste heat of flue gas, but also reduce the temperature entering the flue gas de...

AI Technical Summary

Problems solved by technology

1. Since the temperature of the wall surface of the heat exchange tube is much lower than the acid dew point of the flue gas, acid dew will be generated on the wall surface of the low-temperature tube bundle of the heat exchanger, causing low-temperature corrosion; 2. The existing flue gas heat exchanger made of ordinary stainless steel metal tubes It is impossible to realize the low-temperature heat exchange utilization of flue gas, that is, if you want to recover as much flue gas heat as possible, you must reduce the flue gas temperature as much as possible. At the same time, the more flue gas heat recovered, the replacement of stainless steel metal pipe The low-temperature corrosion phenomenon on the heat pipe will become more and more serious, making it difficult to guarantee the life of the heat exchange tube. If the absorption is too much, it is necessary to ensure that the temperature of the flue gas is above the acid dew point, and only part of the waste heat in the flue gas can be absorbed; 3. The flue gas produced by boilers burning coal and other fossil fuels contains a certain amount of soot, and the acid dew is in contact with the soot , the fouling problem is also unavoidable, specifically, when the flue gas temperature drops and acid dew appears, the smoke dust in the flue gas combines with the acid dew to form a hard scale layer, which adheres to the surface of the heat exchange tube and the dead angle positions such as the tube bundle support plate ,Due to the requirement of the heat exchange area, the arrangement of the tube bundles is tight. Even if measures such as steam blowing are used, it is difficult to clean it thoroughly. shutdown

[0005] Some of the heat exchange tubes in the existing flue gas heat exchangers are made of fluoroplastics. The disadvantage of this type of flue gas heat exchanger is that the fluoroplastic tubes in the flue gas heat exchanger It is flexible, and it is easy to vibrate and deform under the impact of flue gas flow. Not only is it very easy to damage, but the heat transfer efficiency will also deteriorate accordingly.

[0006] In addition, the structure of the fluoroplastic tubes of the existing flue gas heat exchanger is not reasonable enough. The fluoroplastic tubes are fixed by bending and interspersed in the positioning grid. On the one hand, the bending torque generated by bending affects the installation efficiency of the fluoroplastic tubes and reduces the service life , Another convenience is that when the hot flue gas continues to pass through, the softening of the fluoroplastic is prone to bending marks, resulting in poor circulation of the cooling water in the fluoroplastic pipe, and in severe cases, it is easy to be blocked and reduce the heat exchange efficiency

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