High-temperature generator for lithium bromide cold and warm water unit and pipe expanding method

Abstract

The invention provides a high-temperature generator for a lithium bromide cold and warm water unit and a pipe expanding method. The high-temperature generator comprises pipe plates and heat exchanging pipes, and the heat exchanging pipes are inserted into holes of the pipe plates. The heat exchanging pipes are the titanium heat exchanging pipes, and the insides of the holes of the pipe plates and/or the outsides of the pipe ends of the titanium heat exchanging pipes are coated with silicone oil. The invention further provides the pipe expanding method of the high-temperature generator for the lithium bromide cold and warm water unit. According to the high-temperature generator for the lithium bromide cold and warm water unit and the pipe expanding method, on the one hand, by adopting the titanium heat exchanging pipes and compared with copper heat exchanging pipes, the quantity of utilized materials can be reduced by more than 70%; and on the other hand, the degree of difficulty of pipe expanding can be lowered, and airtightness is greatly improved.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a high-temperature generator for a lithium bromide cold and warm water unit and a tube expansion method. Background technique [0002] The lithium bromide cold and warm water unit heated by the separated high-temperature generator has the feature of separating the main body from the high-temperature generator during heating. Since the high-temperature generator has no mechanical moving parts, it can reduce wear when the main body is not running. After more than 20 years of actual operation and verification by a large number of users: the failure rate is reduced by 70%, the heat dissipation loss is reduced by 60%, and the scaling of the evaporator during heating is avoided to affect the cooling. Life can be doubled. [0003] The heat exchange tubes in the high-temperature generator are traditionally made of copper heat exchange tubes. Although the thermal conductivity is hi...

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Problems solved by technology

[0003] The heat exchange tubes in the high-temperature generator are traditionally made of copper heat exchange tubes. Although the thermal conductivity is high, it has the following disadvantages: 1) Copper has low hardness and is not resistant to erosion, corrosion and wear; 2) Copper is prone to oxide layers and easy to form Long-term use leads to a decrease in heat transfer capacity; 3) Copper is not resistant to corrosion by ammonia, sulfide and acidic substances

[0004] Afterwards, it was improved, and stainless steel heat exchange tubes were used instead of copper heat exchange tubes. Although the hardness and corrosion resistance were improved, it had the following disadvantages: 1) Stainless steel was not resistant to corrosion by a large amount of chloride ions in water, resulting in problems such as pitting corrosion and stress corrosion ;2) The thermal expansion coefficient of stainless steel is higher than 50% of the carbon steel shell used as a high-temperature generator, resulting in uneven expansion of the carbon steel shell and heat exchange tubes during work, resulting in greater stress and damage; 3 ) Stainless steel can produce under-scaling corrosion (a kind of oxygen concentration corrosion) in the case of scaling

[0005] In order to solve the above problems, titanium heat exchange tubes are used to replace stainless steel heat exchange tubes in the prior art, and good results have been achieved. However, since titanium is a material with a high elastic coefficient, its yield strength is very close to the fracture strength. If the tube expansion force is insufficient, the material will rebound. If the tube expansion force is too large, it may crack, so it is difficult to grasp the expansion force of the titanium heat exchange tube

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