Control of fast heating rate during the initial startup of methanol synthesis

You can contact the previous process stage to adjust the CO2 level (by increasing it appropriately), which will help you regulate the heat of reaction. Reduce the CO level slightly to make the reaction less intense. It’s also important to keep a tight control on the temperature of the material entering the furnace, making adjustments as needed. The level of waste liquid in the tank can also be used to make temporary adjustments to the furnace temperature. Additionally, check the opening degree of the valves in the cold bypass line. This isn’t a complete list; please let other experts add to it.

Currently, copper-based catalysts are most commonly used in the production of methanol, with the maximum operating temperature for such catalysts being 290 degrees Celsius. If the temperature is too high, it will affect the lifespan of the catalyst. The temperature of the catalyst during startup reduction should be increased gradually; otherwise, it will affect the catalyst’s activity. Therefore, controlling the temperature increase during startup reduction is very important. Measures to control the heating rate: 1. Increase the concentration of carbon dioxide appropriately. Carbon dioxide reacts with hydrogen to produce water, and the heat released in this reaction is less than that resulting from the reaction between carbon monoxide and hydrogen. An appropriate increase in the carbon dioxide concentration is feasible; generally, a concentration range of 3% to 15% is acceptable. A high carbon dioxide concentration leads to a higher water content in methanol, which affects its quality and also increases the steam consumption in the distillation process. The optimal level of carbon dioxide should be 4% to 6%. 2. Reduce the oxygen content in the reducing gas. 3. Control the space velocity of the reducing gas; generally, a higher space velocity leads to more heat removal, which can help lower the temperature.

Since the original engine used a new catalyst with high activity, the system’s circulation rate had to be low, which meant less heat was transferred through water cooling. The method recommended by the moderator, which involves controlling the pressure of the gas tank, is the most effective. Another option is to increase the CO2 concentration slightly and reduce the synthesis rate

1. Generally, nitrogen is filled in the synthesis tower before driving the system; once connected, the catalyst begins to react, and the pressure in the synthesis drum increases rapidly. By opening the valve for discharging steam from the drum in a timely manner based on temperature trends, it is possible to effectively control the temperature of the bed layer and replenish the boiler feed water promptly. 2. Analyze the gas composition of the preceding process; if the CO2 content is high, it will cause a rapid increase in temperature in a short period of time. As mentioned on the second floor, it is only possible to increase the CO2 level in moderation; the by-product water can help reduce the rise in temperature. Additionally, when the amount of synthetic CO entering is high, more heat is generated as a result of the reactions that take place inside the tower. It is therefore necessary to adjust the valve controlling the flow of steam from the steam drum promptly.

Control the drum pressure carefully; for every 0.1 MPa increase in drum pressure, the catalyst temperature rises by 1.5 degrees. Therefore, it is essential to maintain proper control of the drum pressure in order to ensure stability.

Controlling the CO2 level should have an effect

The main focus is on controlling the hydrogen addition rate; if it is a water-cooled tower, the drum pressure is also controlled simultaneously