December 5th Weekly Topic on Ammonia Synthesis Knowledge
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In the production of synthetic ammonia and glycerol, what impacts does it have on synthetic ammonia production? 1. Since methanol synthesis consumes more hydrogen than ammonia synthesis without consuming nitrogen, as the alcohol-to-ammonia ratio increases, it is necessary to raise the hydrogen content and reduce the nitrogen content in the feed gas. This results in a decrease in the gas production capacity of the gas generator, making gas generation more difficult; it is also hard to adjust the hydrogen-to-nitrogen ratio in the resulting gas, and existing gas generator systems may prove to be insufficient in capacity. 2. The production of bifunctional alcohols reduces the production load on the shift process; as the alcohol-to-ammonia ratio increases, steam consumption is reduced, and the shift resistance also decreases accordingly. However, at higher alcohol-to-ammonia ratios, a higher level of CO at the outlet of the shift system is required. If the shift process is not a full low-temperature shift process, it is not possible to increase the outlet CO by significantly reducing the amount of steam added; otherwise, the medium-temperature shift catalyst will suffer from excessive reduction, which affects its service life ； A feasible approach is to add a methanol bypass line on the inlet and outlet pipes of the low-temperature converter, to regulate the CO content at the system outlet. 3. The investment in methanol synthesis has resulted in cleaner inlet gases for the refining system; at the same time, the loading on the refining process has been reduced, leading to lower copper and electricity consumption. It has also been possible to maintain the specified levels of trace elements in the fresh gas used in synthesis. No adverse effects have been observed as a result of trace amounts of methanol entering the copper solution. Rather, when the ligand alcohol is stopped for too long, frequent liquid carryover in the refined outlet gas occurs, which is particularly severe in plants with inadequate desulfurization. 4. If the balance section is removed from the nitrogen-hydrogen compressor, its last two cylinder sections are on the same side; due to the addition of diethanol and the resulting increase in pressure difference, piston leakage increases, and even the gas exiting the copper washing unit (containing ammonia) ends up entering the methanol system. 5. For plants that produce urea, the reduction in synthetic ammonia production due to the production of dihydric alcohol will lead to a decrease in urea output ； For every ton of 100% methanol produced, urea production decreases by 1.4 tons.
This post was last edited by Chemical Gas Purification on 2010-12-5 at 14:45. In the production of synthetic ammonia and diol, it has an impact on the synthesis of ammonia: primarily, the temperature at the catalyst site where methanol is processed should be kept between 215 and 280 degrees, with it being preferable not to exceed 280 degrees. Because if the temperature at the hot spot exceeds 280 degrees, certain unknown impure gases are generated during methanol synthesis. When these impure gases are used in ammonia synthesis, they inhibit the ammonia synthesis reaction, reduce its efficiency, and cause an increase in pressure within the ammonia synthesis system.
1. The main change is in the adjustment of the hydrogen ratio in the gas generation system; there is a clear requirement to reduce the nitrogen content in the composition of the gas produced； 2. There are corresponding requirements for the conversion system: the desired concentration of carbon monoxide after conversion is high, and the amount of steam used for conversion will gradually decrease ； 3. The operating cycle of ammonia synthesis involves slight changes in hydrogen compared to before, but these changes are not significant; the purity of the gas needs to be higher, which is beneficial for the synthesis process. 4. If there is a copper washing stage after the methanol stage, the production load on copper washing **decreases**, and the operating costs also drop. However, it is essential to ensure that the amount of alcohol in the gas phase is well controlled; exceeding this limit must be avoided to prevent any adverse effects on the copper washing process.
Ammonia-alcohol co-production can effectively recover carbon monoxide from the ammonia production line. Carbon dioxide from the methanol production line can also be recycled. The greatest advantage is producing products based on market prices. To maximize the utilization of the equipment.
Reply to 1# Yan Qiusheng: When the alcohol-to-ammonia ratio is too high, it has an impact on carbonization crystallization, resulting in fine, flaky crystals. The compression ratio of stages 5–6 of the compressor increases, causing the rings in stage 6 to wear out easily. Excessive temperature control in the later stage of methanol catalysis leads to an increase in side reactions, which affects the ammonia catalyst, similar to carbon monoxide poisoning.
This post was last edited by 654262293 on 2010-12-6 at 13:14: 1. Adjust the product structure to maximize economic benefits. 2. It becomes more difficult to adjust the hydrogen-to-nitrogen ratio in gas production. 3. As the load changes, it decreases, and steam consumption drops significantly. 4. The load for decarburization will also be appropriately reduced. 5. The workload of the refining position is reduced.
Synthetic ammonia can be converted efficiently at high pressure only when it has a specific nitrogen-to-hydrogen ratio; an excessive proportion of either component increases the workload of the cycle and raises energy consumption.
Although I don’t understand it, I still want to try to learn it**
It can reduce the methane content at the outlet of the methanation reactor, thereby decreasing the flow rate of off-gases in the ammonia synthesis system； Increase the carbon utilization rate in the alcohol-ammonia system ； Reducing the load on the conversion and decarburization systems is particularly significant for the decarburization system, which serves as a bottleneck in the plant.
By adding dihydroluxene to synthetic ammonia, it is possible to change the product structure, resulting in an additional product； Secondly, after the addition of ligand alcohol, the levels of CO and CO2 in the refined feed gas are significantly reduced, which helps to lessen the load on the copper washing process ； Of course, the load on the synthesis tower has also decreased, which is beneficial for capacity expansion ； Of course, the current alcohol-based processes are rather outdated; it would be best to install a set of alcohol-etherification units at once as a replacement for copper washing, which would also help reduce production costs.
I wanted to know that too; now I can finally see the answer. Thank you all, seniors!