Conversion of coke oven gas to LNG

Piping must be purged thoroughly, and any insulation work that needs to be done must be carried out properly.

1. Pipeline purging, pressure testing, and leak testing must be carried out properly. Especially for purging, it is best to confirm multiple times before purging that no new items have been added. If the purging is not done properly, you will find that the valves do not close tightly and that the control valves do not function properly after just a few days of use. 2. Thermal pipelines must be thoroughly inspected in accordance with the drawings; care must be taken to use fixed supports where they are required, and sliding supports must be used wherever sliding is necessary. Many construction companies weld the sliding support points in place for ease of construction. 3. Before using the spring bracket, be sure to remove the pin; large temperature fluctuations occur during operation, and failing to address this issue can very likely damage the pipes and equipment. 4. The heating vulcanization should be carried out according to the catalyst manufacturer’s procedures, with careful control of the temperature rise rate. If you have not done this before, it is recommended to hire a team experienced in such operations. 5. The reduction in the superfinishing process is crucial; it is essential not to allow the temperature to rise too much during this stage. Even if it means working more slowly, the safety of the catalyst must be ensured. 6. Proper hot tightening and cold tightening of the pipeline connection flanges must be carried out; you can consult relevant materials for more information. It’s fine to delay the insulation work at the flanges for a few days; at the very least, wait until thermal tightening is completed during the high-load testing before carrying out the insulation. 7. The pre-cooling of the LNG storage tank can be carried out in advance, at the cooling rate specified by the manufacturer; if time is limited, liquid nitrogen can be used for pre-cooling ahead of time. 8. The flange of the inlet valve of the loading pump is prone to leakage; do not apply insulation too early – tighten it several more times before applying the insulating material.

For now, these are the only points that come to mind. If anything unusual happens while you are driving, you can contact me and we can discuss it together

1. During the initial startup phase, since the new pipeline equipment, catalysts, and fillers can absorb sulfur, it is possible that the sulfur content at the inlet of the pre-hydrogenation and hydrogenation units will be low. It is not advisable to use systems for extensive desulfurization or benzene removal; if benzene gets into subsequent processes, it is likely that methanation cannot take place completely, resulting in the material going to the deep cooling stage and causing tower blockages and shutdowns. During the early stages of operation, an appropriate amount of sulfur can still be added. 2. The cryogenic refrigerant you use should also be a mixed refrigerant; it is best to add methane by vaporizing the LNG at the bottom of the distillation tower, in order to avoid introducing hydrogen

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During the vulcanization process, it is recommended to take measures to protect the screw compressor; a filter should be installed on the return pipeline. Fire hazards must be taken into account during vulcanization； The oil washing of the engine unit was carried out thoroughly ； For the various discharge points that are pre-purified, it is essential to provide insulation, as well as short circuits and flanges that facilitate removal and cleaning ； At the beginning of the design phase, welding is usually used; it is very difficult to carry out cutting and replacement ； It is recommended to install a filter before the liquefied gas enters the cold box through the cooling pipeline, in order to prevent blockage of the heat exchangers in the cold box at the beginning; please remember this carefully ； There are too many other small issues; the original poster should summarize them through practice. Looking forward to seeing posts from you sharing your progress in the future.

During vulcanization, it is necessary to protect the nitrogen pipelines related to synthesis.

Many coking enterprises have stopped production; you’ve done well, congratulations! !