What should be considered when regenerating methanol-rich stream in low-temperature methanol washing?
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This post was last edited by Fengye Hong on 2009-5-28 23:52. What should be considered when regenerating methanol-rich fluid using low-temperature methanol washing? Please give me some advice, thank you
Strictly control the temperature of the gas exiting the regeneration Claus unit; it should not deviate too much from the design temperature. If the temperature is too low, incomplete regeneration may occur, resulting in excessive hydrogen sulfide levels along with low methanol content. Being too high will cause hydrogen sulfide gas to entrain methanol.
Strictly control the temperature of the rich methanol entering the tower, as well as the tower top pressure and steam consumption, to ensure that the temperature at the bottom of the tower remains normal under the operating pressure! If the steam consumption is insufficient, the pressure at the top of the tower and the temperature at the bottom of the tower will be inadequate, resulting in excessive sulfur levels in the methanol-rich stream at the outlet!
It is essential to keep the pressure at the top of the tower under control and minimize its fluctuations, otherwise it will cause disruptions in the regeneration system!
When regenerating methanol-rich stream using low-temperature methanol washing, the following points should be noted: 1. Pay attention to the pressure in the regeneration tower; if the operating pressure is higher than the designed value, even if the temperature meets or exceeds the design specifications, poor regeneration will still occur. 2. As long as the solution is regenerated, even if the hydrogen sulfide content in the reformate increases, it will have little impact on low-temperature methanol washing. 3. The hydrogen sulfide content in the transformed gas varies depending on the sulfur content in the coal. 4. Check whether there is corrosion in the internals of the regeneration tower; also inspect the differential pressure gauge of the regeneration tower. 5. Check for any minor internal leaks in the heater
Attention should also be paid to the sulfur content, carbon dioxide content, and water content in the lean methanol output from the tower
Attention should also be paid to the sulfur content, carbon dioxide, and water content in the methanol-rich outlet stream
1. Strictly control the temperature of the rich methanol entering the tower. 2. Control the top pressure of the tower and the amount of steam used, to ensure that the bottom temperature remains normal at the operating pressure (if these controls are not properly managed, the sulfur content in the outlet lean methanol will definitely be too high). 3. Check whether there is any minor internal leakage in the heater, as this could increase the water content. Active participation :handshake
Control the steam heating temperature in the thermal regeneration tower, and adjust the pressure in the thermal regeneration tower in a timely manner to maintain stability
Do not set the regeneration temperature too high; although this ensures regeneration, excessive methanol being carried away with the hot regeneration gas will increase energy consumption and lead to higher methanol usage
1. Control the flash pressure of each section properly； 2. Control the steam heating temperature in the thermal regeneration tower ； 3. Pay attention to the temperature control of the methanol vapor being stripped ； 4. Pay attention to the temperature control of the condenser at the top of the thermal regeneration tower.
Control the temperature of the tower; higher temperatures are favorable for resolution.
That is, the distillation process involves the main temperatures, pressures, and regeneration conditions.
This post was last edited by MapleLeafRed on 2009-5-28 23:53 regarding thermal regeneration. One thing to pay attention to is the steam temperature. . Second, pay attention to the levels of hydrogen sulfide and ammonia in lean methanol. . It’s possible to tell at a glance whether the regeneration is good or not. . The temperature inside the tower is high. The outlet temperature at the top of the tower is also correspondingly higher. If the water cooling effect is poor. This results in an increased ammonia cooling load later on. . . These analyzed components in lean methanol indicate the quality of regeneration
This post was last edited by Fengye Hong on 2009-5-28 23:53: strictly control the temperature of the rich methanol entering the tower, as well as the tower top pressure and steam consumption
Could everyone provide specific figures when discussing? For example, what is an appropriate level to control for the S content in recycled methanol? What is the appropriate corresponding value for the top temperature of the tower and the bottom temperature? Only by discussing in this way can things be substantive, can everyone benefit greatly, and can the exchanges be concrete.
It’s mainly about controlling pressure; only by controlling pressure properly can we talk about temperature
The lower the S content in the regenerated methanol, the better, especially if we intend to carry out sulfur recovery. When controlling the top temperature, it is still necessary to follow the design specifications as long as the required criteria are met; otherwise, if steam is added in an attempt to increase the methanol content in the regeneration tower, it will lead to unstable pressure control, and such instability has a negative effect on both the regeneration process and the circulation process. Our regeneration process isn’t carried out using a single tower either; it’s better to make comprehensive adjustments using both the azeotropic distillation column and the methanol-water tower.