Kaifeng Group of the Yellow River air separation of the high-Yau
Abstract: The purification system in operation in the course of the accident analysis.
                                          Foreword
    Key words: purification systems, physical adsorption, zeolite, purifying effect, accident analysis.
    Molecular sieve adsorbent of water, the absorption of carbon dioxide and hydrocarbons are physical adsorption, absorbent surface there are a lot of really cylindrical holes, according to the different diameter holes in the low-temperature state of absorption components of the molecular chain length, its absorption Efficiency is not the same. Zeolite purification system will have a purifying effect, a direct impact on the operation of air separation plant for the same equipment, improper operation, but also may affect the purifying effect, reducing production efficiency. Therefore, the purification system is running only guarantee the stability of the entire space subsystems to ensure the normal operation.
                                    Accident Analysis
    1, molecular sieve with water purification systems Accident Analysis:
With a water accident, pre-cooling system `cooling pumps, chilled water circulating pump too much, resulting in air-cooled Tabou water gauge water treatment, water distribution inundated with too much liquid gas channel, gas-liquid attached to water absorption into the molecular sieve For. Features: Water fast, there is generally a few minutes into the water a lot, because surface water Ambassador zeolite powder, lower intensity, a lot to plug porous zeolite, the absorption capacity decreases. Has been unable to rely on renewable zeolite absorption efficiency of absorption of factory standards. To be replaced in the work of a can of zeolite.
    The incident with water, recycled water and medicine caused by improper low-temperature crystal, crystal plug the water distribution channel for water, air-cooling tower water tower filled, air-cooled water cooling towers is not down, the air cooling tower diffuse gas pipelines, water gradually into an attachment to gas-liquid Zeolite absorber. Water accidents and the results of a basically the same.
    Three accidents with water, air-cooling towers bottom surface of failure (most of the liquid level of positive pressure in the plug), far higher than the actual surface on the DCS display surface, the operator is not found in time, so that the surface Man Air-cooling tower gas pipelines, water gradually into an attachment to gas-liquid zeolite absorber. Water accidents and the results of a basically the same.
    40 accidents with water, pre-cooling system `cooling pumps, pump start and stop frequent frozen or cooling water, chilled water rate adjustment much so that the air-cooling tower formation of the hanging. An attachment to gas-liquid water into the molecular sieve absorber. The results with water and a basic similar incidents.
    Five accidents with water, chilled water air-cooling tower upper water is too small, cloth water so that water atomized water ventilation, water mist to enter the zeolite absorber. Features: Water slowly, generally with water when found not too much, renewable 23-cycle, can also use a molecular sieve adsorbent, but molecular sieve adsorbent life has been reduced.
    Six incidents with water, pre-cooling chiller system failure, chilled water temperature increases, so that exports of air-cooling tower air temperature rises, when the temperature is higher than 15 ℃, wet air saturation of more than zeolite absorbent capacity, water Slowly gathered in the molecular sieve absorber. Water accidents and the results of the five is basically the same.
    Water accidents 7.30, large air compressor pressure fluctuations caused by frequent air-cooling towers and air handling Mandrax small quantity of Mandrax, the flow rate of Mandrax Mandrax is also small, air-cooling tower cooling water flow impact of water into the molecular sieve absorber, the results Water accidents and five basically the same.
    Water eight incidents, water-cooling towers bottom surface of failure (most of the liquid level of positive pressure in the plug), far higher than the actual surface on the DCS display surface, the operator is not found in time, the surface diffuse pollution Imports of nitrogen, water intrusion is to the regeneration of zeolite absorber in a can. Features: faster with water, electric heater temperature Shangbu Qu, less than 110 ℃. Serious, the need to replace a can of regeneration of zeolite, lighter, the first row of water pipes, and renewable 23-cycle, can also use a molecular sieve adsorbent, but molecular sieve adsorbent life has been reduced.
    Water accidents 9, after stopping air compressor, water-cooling towers Water Commissioner forget valve, or air compressor drive, no water-cooling towers Water Commissioner valve, water-cooling tower liquid nitrogen imports of diffuse pollution, water intrusion regeneration of the need to Absorber, a can of zeolite. Results and eight accidents with water is basically the same.
    2, molecular sieve CO2 purification system超标Accident Analysis:
    CO2超标an accident, molecular sieve with water CO2超标.
    CO2超标two incidents, the worst environmental CO2, occupation factory in the air contains a lot of acidic gases, such as: hydrogen sulfide, sulphur dioxide, nitrogen oxides, or the cycle of acidic water into a molecular sieve into the lead for the purification of acidic gases into the adsorption The process of molecular sieve adsorbent with water and acid gases react so that the molecular sieve adsorbent structure of irreversible change, lower absorption capacity, resulting in a molecular sieve gas CO2超标.
    CO2超标three incidents, do not complete regeneration of CO2超标.   

According to practical experience, 13 X zeolite sorbent regeneration temperature control in about 170 ℃, the temperature reached 85 ℃ exports over when to stop heating, blowing into the cold period, cold winds peak absorption zeolite structure under a different molecular sieve adsorbent bed thickness Different, not the same as the peak cold winds, generally in control of more than 140 ℃ for the best. Regeneration temperature is too low, being sucked component can not be completely desorption, that is, within the porous molecular sieve adsorbent was also part of residual absorption components have not been expelled, further adsorption, absorption capacity will be reduced, resulting in CO2超标.
    CO2超标four incidents, as operator errors, operation molecular sieve   adsorbent bed by the impact of air, surface Tuao grievances bed, the gas short circuit, caused by lower volume of CO2 absorption超标.
    CO2超标five incidents, the use of zeolite long time, some molecular sieve absorbent powder, to reduce bed, or molecular sieve bed absorber break-hoon, molecular sieve adsorbent leak, caused by lower volume of CO2 absorption超标.
                                    Concluding remarks
    Purification of the system is running only the stability, in order to ensure the stability of oxygen system, in operation and purification systems, should always seek the seizure, even if found to solve the problem, remember to slow operation, it is necessary to correct, not blindly operation