How to deal with hydrogen compressor failure?

Have you ever experienced a hydrogen compressor failure? Then you can only worry, because you don't understand the structure of the machine. Probably understand some of the following, you will know in advance what went wrong before the compressor failure, and solve it in advance.

Point：

• Hydrogen compressor accident performance

• Approach

• Selection requirements for high pressure hydrogen compressors

Hydrogen compressor accident performance

1. The amount of hydrogen suddenly decreases, the hydrogen pressure drops, and the hydrogen flow rate is zero.

2. The temperature at the inlet of the fluctuated and increased.

3. System pressure drops.

4. The hydrogen compressor is shut down and the pressure at each level is abnormal.

Approach

1. If it is a compressor failure, you can resume normal production by switching the standby machine.

2. If the hydrogen machines are all faulty and other hydrogens are not available, follow the steps below.

3. Internal operation will change the temperature control of the reactor to manual operation, reduce the inlet temperature of the reactor and reduce the feed amount of the unit.

4. Inform the outside operator to go to the field device to change the large cycle operation, open the product and change the unqualified line valve, and close valve.

5. Reduce the stripping steam volume of the dehydrogenation stripping tower, stop the pump and the scale inhibitor pump.

6. The circulating hydrogen continues to circulate, and the system pressure is maintained as much as possible. If the pressure drops to the lowest operating pressure of the circulating hydrogen compressor, the system is filled with hydrogen to maintain the operation.

7. The circulating hydrogen is changed to cross the line, the solvent circulation is maintained, the low gas is removed before the gas is removed, and the fuel gas is released from the torch to ensure the normal operation of the desulfurization system.

8. The steam generator's vent valve opens to prevent steam from carrying water.

9. If the hydrogen is not supplied for a long time, contact the production management department to stop the installation.

Selection requirements for high pressure hydrogen compressors

l  Unit selection requirements

Compressors are generally divided into two types: turbine type and volume type. The choice of compressor depends entirely on the technical requirements related to the unit used, such as gas type, volumetric displacement, and pressure to be achieved. For high pressure hydrogen, only diaphragm and piston compressors (both are positive displacement compressors) can be used. The technical advantages of the piston type hydrogen compressor are mainly: high efficiency, relatively simple unit control system, almost no change in exhaust pressure during gas volume adjustment, and high reliability. The diaphragm type hydrogen compressor has the characteristics of large compression ratio, wide pressure range and good sealing performance. Because its air cavity does not require any lubrication, it ensures the purity of the compressed gas, especially suitable for the compression, transportation and filling (such as hydrogen) of flammable, explosive, toxic and harmful, high-purity gas. According to the difference of exhaust pressure, it is generally divided into single-stage and two-stage compression. The primary compression is generally pressurized from 0.1 MPa to 1.0 MPa, and the secondary compression is generally pressurized from 1.0 Pa to 20 MPa, and the flow rate is generally 5 to 1000 m 3 /h. The disadvantage is that the gas volume is smaller and the efficiency is lower than that of the reciprocating hydrogen compressor. From a safety point of view, a diaphragm compressor is generally used to deliver hydrogen gas.

l  Material requirements

Safety, economy and maintenance convenience are the basic requirements for selecting high-pressure hydrogen compressors. Under the premise of ensuring safety, the most economical and most convenient maintenance is possible. The safety of hydrogen compressors is manifested in material selection, safety protection control, piping requirements, and sealing requirements. Hydrogen is prone to intergranular corrosion of certain metals at high temperatures and pressures, causing dangers when parts are broken at high temperatures and pressures. Therefore, choosing the right material can avoid the danger. Generally, austenitic stainless steel can avoid intergranular corrosion of hydrogen under high temperature and high pressure, and hydrogen compressors usually choose 316 austenitic stainless steel. The density of hydrogen is very small, and the leakage ability is strong. When the leaked hydrogen reaches a certain concentration in the air, it will burn or even explode when it encounters fire. Therefore, when designing a hydrogen compressor, the sealing should be considered from all aspects to ensure that hydrogen does not leak.

The machine will behave differently for each failure. If you want to understand the failure of other compressors such as oxygen compressors, nitrogen compressors.