1. How does a heat exchanger work?

Heat exchanger is the equipment that transfers part of heat from hot fluid to cold fluid, also known as heat exchanger. According to the heat transfer principle heat exchanger is divided into wall heat exchanger, regenerative heat exchanger, fluid connection indirect heat exchanger, direct contact heat exchanger, compound heat exchanger; According to the classification of use, it is divided into heater, preheater, superheater, evaporator; According to the structure can be divided into: floating head heat exchanger, fixed tube-plate heat exchanger, U-shaped tube-plate heat exchanger, plate heat exchanger and so on.

2. Resonance problem of heat exchange unitHeat exchanger unit is to consider the organizational structure, there is also a resonance problem, like the sound wave vibration situation, bring sound and so on. The heat exchange unit heat exchange control and the whole shell adopts stainless steel material, with the expansion coefficient, the pressure of 1.6mpa, temperature of 400℃, not because of the pressure and temperature not quiet and caused by the deformation of the heat exchanger; No temperature and pressure reducing device is required. The shell of the extensive heat exchange unit is made of carbon steel, and the pipe is red copper. Because the material is not extensive so the expansion coefficient is not common, with thermal expansion and contraction easy to crack the tube at the solder joint. In addition, most of the floating coil type, coil connection vibration, more easy to break the pipe, for the late construction of the heat exchange unit constitutes a great deal of trouble.

3. Cause analysis of heat exchanger explosion

Cause analysis of heat exchanger explosion:

1, homemade heat exchanger, the heat exchanger structure and material blindly do great changes, the manufacturing quality is poor, does not meet the pressure vessel standards, equipment strength is greatly reduced.

2, heat exchanger welding quality is poor, especially the welding joint is not welded through, and there is no weld inspection, blasting experiment, resulting in welding joint leakage or fatigue fracture, and then a large number of flammable and explosive fluid overflow, blasting.

3, due to corrosion (including stress corrosion, intergranular corrosion), the pressure strength decreases, so that the bundle failure or serious leakage, in case of open fire explosion.

4. When the heat exchanger does the air tightness experiment, the oxygen pressure is supplemented or the combustible essence gas is used to test the leakage, causing the physical and chemical explosion.

5. The heat exchanger is operated illegally and incorrectly, and the valve is closed, causing overpressure explosion.

6, for a long time without sewage, flammable and explosive substances (such as nitrogen trichloride) accumulation too much, and the operating temperature is too high to lead to heat exchanger (such as liquid chlorine heat exchanger) produce violent explosion.

7. Peroxide blasting.