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How To Distinguish Between Old And New Heat Exchanger
- Oct 20, 2017 -

How to distinguish between old and new Heat Exchanger
In chemical work, we often use Heat Exchanger. Do you know how we should identify new and old Heat Exchanger? Next Xiaobian for your details about it!
1. Check the outer welding of the Heat Exchanger, the old Heat Exchanger in the weld will be refurbished after the traces of repair; 2. Check the kettle body below the mouth of the discharge mark, the new Heat Exchanger forging finished Welding the surface after the paint will be more smooth, and the old Heat Exchanger flange where there will be rust, even if the rust, and will leave traces; 3. Check the kettle body into the steam, To avoid the impact of steam is too large and the phenomenon of porcelain, the new Heat Exchanger will generally have sub-steam device. 4. The new Heat Exchanger jacket and the barrel of the weld is flat and uniform, the paint is also relatively smooth.
The Heat Exchanger was calcined at 900 ° C and cooled, and the glass was bonded to the steel plate after cooling. Since the coefficient of linear expansion and elongation of the glass-lined glass is smaller than that of the steel plate, the amount of deformation of the glass after cooling is smaller than that of the steel plate, and the glass-lined glass is subjected to compressive stress by the steel plate. After the Heat Exchanger is made, there is a pre-compression stress, and the steel sheet has a pre-tensile stress. Because the prestress is related to the coefficient of linear expansion and elongation, the linear expansion coefficient and elongation are closely related to the temperature, so the operating temperature of the Heat Exchanger has a great influence on the use of the Heat Exchanger. If the stress caused by the glass is greater than the stress due to the temperature change, the glass-lined glass will be destroyed.
The Heat Exchanger is a glass containing high silica, lining the inner surface of a steel container and being firmly adhered to the metal surface by high temperature burning to become a composite material. Therefore, it has the glass stability and metal strength of the dual advantages, is an excellent corrosion-resistant equipment. Is working in the harsh environment of high temperature, it needs to be rigorous operation, the following will give you a description of the Heat Exchanger after the end of the operation:
1, according to the technical procedures for processing Heat Exchanger material after the stop mixing, and check, cleaning the relevant pipeline and equipment;
2, the Heat Exchanger residue washed, can not be washed with alkaline water enamel pot, can not use acidic solution flush stainless steel kettle;
3, strict implementation of the shift management system, the Heat Exchanger operation and the integrity of the case included in the shift.
The Heat Exchanger is a glass containing high silica, lined on the inner surface of a steel container, and is firmly adhered to the metal surface by high temperature burning.
Heat Exchanger operating pressure is high. The pressure inside the kettle is generated by a chemical reaction or is caused by an increase in temperature. The pressure fluctuates greatly and is sometimes unstable. The sudden increase in pressure may exceed several times the normal pressure. Therefore, most of the Heat Exchanger belong to the pressurized vessel The In the Heat Exchanger is usually carried out in the chemical reaction, in order to ensure the reaction can be carried out evenly and faster, improve efficiency, usually in the Heat Exchanger with the corresponding mixing device, so it will bring the drive shaft dynamic seal and prevent leakage The problem.
In the jacket to pass high-temperature steam or ice-cold medium heating or cooling, the first small to join, and other equipment temperature rise or lower to a certain temperature, and then a large number of access, to avoid the jacket within the sudden change in temperature caused by porcelain. In order to avoid the occurrence of such events, it is recommended that you choose a thermometer casing with a quick temperature probe in order to reduce the sharp rise in the temperature and have to pass a large number of refrigerated media in order to quickly and accurately Understand the temperature inside the tank. Especially in the tank medium reaction is more intense or the process temperature control requires strict equipment. Ordinary thermometer casing due to glass-lined layer of thermal conductivity is poor, temperature hysteresis will lead to very serious consequences;
Heat Exchanger glass-lined layer is strictly prohibited hot and cold medium direct impact and the metal substrate back, the temperature of the rapid quenching and cooling can easily lead to glass-lined porcelain. The standard stipulates that the glass-lined layer should be subjected to thermal shock at 120 ° C and a cold shock of 110 ° C. However, many times the frequency of frequent large temperature cold, hot or caused by the glass-lined layer of porcelain fatal causes. Therefore, this phenomenon should be avoided as much as possible. For example, when adding a relatively high temperature heat medium to the cold reaction tank, it is advisable to heat the reaction tank first. When adding a cold medium to the heated reaction tank, it should be added in a small amount several times, or the equipment is cooled and then added The