Synthetic Ammonia Process Technology Exchange Area [Daily Question 2009-02-17]
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Synthetic Ammonia Process Technology Exchange Area [Daily Question 2009-02-17] How is refined gas produced using the copper bath method during the startup process? Has it been smooth? How long did it take? Purpose: Communication and mutual progress. Hope: Work together to help newcomers improve! Link: Synthetic Ammonia Process Technology Exchange Area [Daily Question 2009-02-16] What are the problems associated with the design and use of copper pumps and pipes for producing refined gas using the copper melt method? http://bbs.hcbbs.com/thread-390428-1-1.html Synthetic Ammonia Process Technology Discussion Forum [Daily Question 2009-02-15] What are the causes of overcurrent in screw chillers and how to address them? http://bbs.hcbbs.com/viewthread.php?tid=390338&highlight= Synthesis Ammonia Process Technology Exchange Area【Daily Question 2009-02-14】For the refining position (copper melt method), what are the reasons for low pressure at the inlet of the copper pump, and what are the solutions? http://bbs.hcbbs.com/thread-389713-1-1.html This post was last edited by jindin312 on 2009-2-16 21:05 ]
If there is no pressure in the copper tower, when starting the refining process, I turn on the high-pressure copper pump as soon as the compressor starts supplying air; I don’t wait until the pressure reaches 70 MPa as suggested in the books. In fact, as long as there is some pressure in the copper tower, the molten copper can be forced into the reflux tower through the pressure reducing valve. This approach allows for a faster processing speed, and it takes less time to remove the gases with high PPM levels from the copper. Once the pressure rises, the PPM levels become acceptable. Unlike before, when it took a long time to remove all the gases with unacceptable PPM levels up to 70 MPa
If there is no pressure in the copper tower, when starting the refining process, I turn on the high-pressure copper pump as soon as the compressor starts supplying air; I don’t wait until the pressure reaches 70 MPa as suggested in the books. In fact, as long as there is some pressure in the copper tower, the molten copper can be forced into the reflux tower through the pressure reducing valve. This approach allows for a faster processing speed, and it takes less time to remove the gases with high PPM levels from the copper. Once the pressure rises, the PPM levels become acceptable. Unlike before, when it took a long time to remove all the gases with unacceptable PPM levels up to 70 MPa
The method for producing refined gas is essentially the same, but careful attention is paid to reducing the time required. Our approach is as follows: 1. Preheat the copper melt in the regeneration system with steam in advance to ensure that the regeneration temperature is reached as quickly as possible. 2. The circulation volume of the refined gas should not be too large. 3. Increase the pressure in the refining system as much as possible to enhance the energy absorption capacity of the copper melt. It usually takes about 40 minutes. This post was last edited by *aoye613 on 2009-2-17 09:54]
I agree with the opinion above: it is advisable to use a low-pressure pump to circulate the fluid in advance, so that the temperatures required for regeneration and ammonia cooling are achieved; once high-pressure gas is supplied, then the copper pump can be turned on. This approach helps to reduce startup time and saves hydrogen and nitrogen gases, although it does result in the consumption of ammonia.
Qualification criteria for 10-minute gas production: First, use a low-pressure pump to circulate the fluid in advance, so that the temperatures required for regeneration and ammonia cooling are achieved. Second, once high-pressure gas is supplied, start the valve at the front of the tower first; once the pressure reaches 2.5 MPa, the copper pump can be activated. The purpose of this is to ensure that copper fluid is delivered to the reflux tower. After that, activate the copper pump – do not keep increasing the pressure until it reaches 8.0 MPa. Once the pressure has reached the desired level, the product gas is qualified; it is sufficient to slightly open the valve at the back. If the quality standards are not met, it is usually due to delays in the infrared analyzer’s readings. This can save driving time and reduce the use of hydrogen and nitrogen.
It is still necessary to wait until there is a certain pressure inside the copper tower before starting the copper pump. Otherwise, it is very easy for gas to enter the copper melt system, causing air blockages and resulting in no inlet pressure for the copper pump. In actual production, I usually wait until the pressure in the copper tower reaches 4 MPa before ordering the copper pump to be started.
The production of refined gas requires first ensuring that the gas can dissolve in the copper melt. The solubility of gases in liquids is primarily determined by pressure and temperature. Given that the partial pressures of carbon monoxide and carbon dioxide in the feed gas are low, the pressure in the copper tower is raised to over 4 MPa before starting the copper pump. At the same time, the ammonia cooling temperature should be maintained at around 12 degrees. If the time required to adjust the composition of the copper melt is not taken into account, the production of refined gas generally takes only about ten minutes.