Application of Bellows Heat Exchangers in the National Economy [Abstract] So far, bellows heat exchangers have been widely used in fields such as thermal power, petroleum, chemical, natural gas, light industry, metallurgy, and urban central heating systems. Played a growing role. With the passage of time and the continuous improvement of bellows technology, bellows heat exchangers will also replace shell-and-tube heat exchangers and become the main equipment in the field of heat exchange. To
Application of bellows heat exchanger in the field of thermoelectricity The application of bellows heat exchanger in the field of thermoelectricity is mainly embodied by the water heater of thermal power plant. The steam from the thermal power plant is passed through the bellows heat exchanger to heat the circulating water to a certain temperature. For example, heating to about 150°C is called a high temperature heater, and heating to about 110°C is called a basic heater. Then, the circulating water is supplied to thousands of households to solve the problem of heating in winter. This combined heat and power method can not only save energy, but also improve the living environment of urban residents and achieve good social benefits.
In recent years, my country’s urban construction has developed rapidly. With the improvement of the people’s living standards, the people’s living standards are also improving, and it is necessary to increase the living area. The large increase in the living area makes the heating capacity of the original heater of the power plant look awkward. This requires an increase in the heat exchange area. However, the space of the plant in the power plant is certain, so the bellows heat exchanger is used to replace the original The shell-and-tube heat exchanger completely solves the above problems.
6.5.2 Application of bellows heat exchanger in the petroleum field
The petroleum industry is a pillar industry of my country’s national economy, and its development is bound to have a powerful boost to the national economy. Therefore, it is an imperative task to fully implement energy-saving technologies in the petroleum industry.
Generally speaking, crude oil pumped up from the ground has a very high viscosity. To transport crude oil from a well platform to a long distance, a great driving force is required. However, if the viscosity of the crude oil is reduced, the transportation of crude oil will be easier. Much. One way is to increase the temperature of the crude oil. In the past, a gas stove was used to heat the crude oil in an oil field, which not only consumed a large amount of natural gas, but also had low actual efficiency, resulting in a lot of waste of energy. Since the use of bellows heat exchangers on the well platform, it has not only saved energy, but also achieved good results. The method is to install a small bellows heat exchanger on each oil well. The crude oil is passed through the pipes, and hot water from the boiler room is passed between the pipes. In this way, the crude oil is heated from the original 20°C to about 50°C, and the viscosity of the crude oil is greatly reduced. Moreover, a boiler room can drive many bellows heat exchangers, and hot water circulates between the boiler and the bellows heat exchanger. As shown in Figure 6-33.
6.5.3 Application of bellows heat exchanger in the chemical industry
The chemical industry is one of the most widely used heat exchangers. Large chemical plants have thousands of heat exchangers, but these heat exchangers are all shell and tube heat exchangers. The process characteristics of chemical plants are heating and cooling, reheating and cooling. An oil refinery in Xinjiang uses bellows heat exchangers to condense organic vapors into liquids. Other chemical plants use bellows heat exchangers as reboilers to remove organics. The mixed substance is heated to 90°C to make it into mixed vapor, and then enters the tower to cool down, repeating and reciprocating. Some chemical plants also use bellows heat exchangers to heat the medium to a certain temperature, and then enter the reaction tower for chemical reactions.
Although the bellows heat exchanger has been used in the chemical industry, its usage is small and belongs to the test and observation stage. And the occasion used is not a very important occasion. It will take time for the bellows heat exchanger to completely replace the shell-and-tube heat exchanger. There are subjective and objective factors. Objectively, this new product of bellows heat exchanger still needs to be improved, and there is still a lot of work to be done, which restricts the wide-scale promotion and application of this product in the chemical industry.
6.5.4 Application of bellows heat exchanger in residential liquefied gas
Bellows heat exchangers have been used in liquefaction heating systems since 1992. A gas company uses two small bellows heat exchangers with an outer diameter of Ø325mm and a heat exchange area of 5m² produced by the Shenyang Instrument and Technology Research Institute to accelerate the gasification of urban residents’ liquefaction. The heating source is 70°C hot water, and the working pressure is 0.3MPa. The hot water runs on the tube side and liquefies and runs on the shell side. A liquid baffle is installed at the outlet of the liquefied gas. The liquid level of the liquefied gas is 1/2 of the shell. The remaining heat exchange area mainly causes the liquid carried in the evaporated liquefied gas to evaporate further. If the liquid is also carried, it is recovered by the liquid baffle at the outlet, and flows back to the bottom of the shell along the shell wall, so that the liquefied gas can be fully vaporized. Since the use of bellows heat exchange tubes, satisfactory results have been achieved.
6.5.5 Application of bellows heat exchanger in light industry
The bellows heat exchanger also has broad application prospects in the field of light industry. A certain brewery uses bellows heat exchangers to cool beer juice. The cooling medium is liquid, and its temperature is -5°C–6°C, and the liquid works in the shell side. The cooled medium is beer juice, the inlet temperature is 13°C, and the outlet temperature is 1°C-2°C. The beer juice works in the pipeline, and its workflow is shown in Figure 6-34. When the beer juice enters the heat exchanger, it releases heat, and the temperature drops to 1 ℃-2 ℃ and then enters the wine storage tank for storage. At the same time, the liquid absorbs the heat of the beer juice and evaporates, and the vaporized gas is compressed by the compressor to form a liquid at -5°C–6°C, and then enters the heat exchanger to complete a cycle process.
6.5.6 Application of bellows heat exchanger in the field of urban central heating
In recent years, in accordance with the needs of energy conservation and environmental protection, many cities in China have built a number of residential quarters. Correspondingly, the guidelines and principles of district heating have been put forward in terms of heating, which has greatly promoted the construction of urban central heating. Rationalization and modernization. Centralized heating has become a hot spot in the construction of large and medium-sized cities.
The heat exchanger used in the central heating system is the main equipment for heat exchange. In the past, shell-and-tube heat exchangers and a small number of plate heat exchangers were used. However, as a heat exchanger for central heating, it has its own unique requirements, such as: high heat transfer coefficient, low temperature difference between cold and hot fluid, no leakage, not easy to block, not easy to scale, etc., to meet the special requirements of central heating Require. Both the shell and tube heat exchanger and the plate heat exchanger cannot have these characteristics at the same time, but the application of the bellows heat exchanger has solved this problem. The bellows heat exchanger used in two heating districts in Shenyang in the winter of 1990 proved that the bellows heat exchanger has high heat transfer coefficient, no leakage, no blockage, not easy to scale, good corrosion resistance, and suitable for low temperature conditions. , It is easy to clean and maintain, and the effect is obvious.
The application field of the bellows heat exchanger is wide. It can not only be used as a preheater and economizer, but also the preparation of domestic hot water used in buildings, halls and pavilions can be completed by the bellows heat exchanger. In some occasions, different structures and different materials are used.
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