Key points of operation of new alcohol hydrocarbon process

.Operation points in normal production 1. Alcoholization system 1.1 Under a certain production load, adjust the split flow rate and cold shock amount. The reasonable performance of shunt and cold shock is as follows: The catalyst zero meter temperature is 200~220℃, the initial hot spot temperature is 230±5℃, the middle stage is 260±5℃, and the late stage is 280±5℃ ； The temperature at each point of the inner cooling layer and lower insulation layer is 200-230℃ in the early stage, 220-260℃ in the middle stage, and 230-260℃ in the later stage. 1.2 Control the liquid level of the alcohol separator. 1.3 Control the liquid level of the crude methanol intermediate tank and the pressure of flash steam. 1.4 Control the CO and CO2 after the alcohol separator to be within the range of process indicators. 2. Hydrocarbonization system 2.1 Under a certain production load, adjust the split flow rate and cold shock amount. The reasonable performance of shunt and cold shock is as follows: The zero-meter temperature of the catalyst is 220~230℃, and the hot spot temperature of the upper insulation layer is 250±5℃ in the early stage and 280±5℃ in the later stage.℃ ； The temperature at each point in the middle and lower layers is 20 to 30°C lower than the hot spot. 2.2 Control the liquid level of the water separator. 2.3 Control the liquid level and evaporation pressure of the hydrocarbonized ammonia cold flash evaporation tank. 2.5 Control the CO+CO2 in the post-hydrocarbon gas to be below 25 ppm.

What kind of accidents occur while driving, what are their symptoms, and how to deal with them.

This post was last edited by long198600 on 2009-8-13 21:21 1 The catalyst temperature of the methanolization tower dropped sharply 1. The circulation volume is too large 2. The fresh gas volume is reduced 3. The CO content in the decarbonized gas decreases 4. Improper operation 5. Alcohol zone liquid 6. High sulfur content poisons the catalyst 7. Internal parts leak 1. Adjust the short circuit of the circulation machine to reduce the circulation volume； 2. Reduce the circulation volume and close the diverter valve or cold shock valve. ； 3. Stabilize the temperature according to the normal temperature adjustment method, and at the same time, coordinate the adjustment to restore the CO content. ； 4. Operate quickly and carefully to prevent excessive counter-adjustment ； 5. Lower the alcohol level ； 6. To maintain production, the two towers can be connected in series to ensure that the CO in the post-alcohol gas does not exceed the standard, and the catalyst can be replaced on standby. ； 7. Maintain production and standby for inspection and repair ；

We are going to start the synthesis first. Do you have any information on synthesis?

This problem has become common. Your factory should have its technicians compile a set of implementation codes to provide regulations on pressure, temperature, hot spots, and other process indicators. What is the catalyst for alcohol hydrocarbonization? Then explain how to control it. This is impossible to complete from here. Specific implementation methods for specific situations. Then there is the process of figuring out the process. Compare it with the real thing. Of course, the driving and parking steps must also be formulated according to the actual situation. These are the main issues.

I just want to know what matters and operational requirements you should pay attention to when producing this system.

Several problems that have arisen during the operation of the alcoholization unit (1) Since the start-up of the unit, there is oil pollution in the discharge liquid at the inlet joint pipe of the A and B alcoholization towers. However, the oil content of the supplementary gas and the oil content of the circulating gas are less oily, and part of the oil pollution is brought into the catalyst layer. Our company's circulation machine adopts oil-free lubrication. From this, it can be judged that the oil and water are carried by the hydrogen-nitrogen compressor. Because the raw gas temperature is between 35 and 45 ℃. In summer, the temperature is as high as 50°C. The separation of oil and water is not complete, and mist is entrained in the gas and enters the catalyst bed. Oil pollution enters the catalyst layer and decomposes at high temperatures to form carbon and high-carbon colloids, which deposit on the surface of the catalyst, blocking the pores within the catalyst, reducing the active center area, and reducing the catalyst activity. Moreover, the oil contains sulfur, phosphorus, arsenic, etc., which will chemically poison the catalyst. For this reason, during the overhaul period, our company added an ammonia cooler with F=200㎡ in front of the alcohol hydrocarbonization system to control the temperature of the raw gas at 10 to 20 ℃. After use, the effect is obvious. About 50 kg of oil and water are discharged from the raw gas and oil in each shift (originally, most of this part of oil and water is brought into the catalyst). There is no discharge in the circulating gas and oil components, the supplementary gas and oil components, and the pour-over joint pipes at the entrances of towers A and B. (2) During the overhaul in 2008, the internal parts of the alcohol separator were replaced, and composite high-efficiency separator internal parts were used. The gas processing volume of the alcohol separator was increased from 180,000 m3/h to 230,000 m3/h, and the methanol content at the outlet of the alcohol separator was reduced from the original 0.8% to 0.33%. (3) Since October 2008, the water cooler (shell and tube type) of Tower A has been waxing. The loads of Tower A and Tower B are equivalent. When the circulating water temperature is 25°C, the outlet temperature of the alcoholized water-cooled gas in A reaches 39°C, while the water-cooled gas in B is only 30°C. The gap between the two is getting bigger and bigger. We have repeatedly flushed the water-cooled shell waterway, but the effect is not obvious. Since the company's production equipment operates stably, except for major repairs, there is almost no opportunity to stop and boil wax. In November, the alcoholization process took advantage of the power limit and quantity reduction in the previous process to conduct online wax boiling.: First, turn up the gas supply (raw gas) of tower B, turn down the gas supply of tower A to CO 0.5%~0.8%, and try to reduce the load of system A as much as possible. Tower A delivers electricity and heat preservation. The circulation machine in Tower A is fully open and the shortcut is open. Gradually close the circulating water outlet valve of alcoholized water-cooling A, so that the outlet air of water-cooling A slowly rises, control the temperature between 70 and 75 ℃, and hot wash for 50 minutes, then gradually open the circulating water valve, so that the outlet air drops to normal temperature, and the hot washing is completed. Notes: ① Changes in water cooling temperature will inevitably increase or decrease the inlet temperature of Tower A, which should be adjusted in time to prevent the catalyst bed from overheating or collapse. ② The water cooling temperature is high, and the reactant methanol cannot be separated. When the oil is mixed with the lower temperature raw gas (10-20°C), the temperature drops by about 40°C, and part of the alcohol will be separated from the oil. The oil should be drained out in time. ③ The water cooler should be heated up and down slowly, and the process should be controlled within 3 to 4 hours. If it is too fast, the temperature will rise and fall suddenly, which may easily cause leakage of the preheater and separator packing. ④ The temperature should be controlled within 75°C to prevent the temperature from being too high and damaging the filling of the cycle machine. ⑤ After boiling the wax, the melted wax adheres to the inner wall of the alcohol separator and the pipe wall. The alcohol discharging valve and liquid level gauge should be opened in time to prevent the wax from clogging the equipment and pipes. After the wax is boiled online in water cooler A, the temperature drops to normal (about 30°C, which is equivalent to water cooling in B).

Thanks for the knowledge provided! Does anyone have any knowledge about hydrocarbonization?