Sulfur-based acid production plant resumes operations

After being shut down for such a long time, there are quite a few items that need to be checked: the manufacturing process, equipment, water supply, electricity, gas, instruments, and so on all require a thorough inspection

It’s been stopped for 4 years! I believe it is necessary to confirm whether the main equipment is still in condition to resume production, such as whether it is necessary to replace the bricks in the sulfur incineration furnace, inspecting the heating area of the waste heat boiler, conducting pressure tests on the boiler system, and checking whether the catalyst has become ineffective ； A comprehensive inspection of the converters and heat exchangers, particularly the corrosion condition at the lower part of the heat exchanger tubes; an inspection of the interior of the absorption tower; as well as inspections of the acid separation units, acid mist demisters, etc. Additionally, inspections are carried out on fans, acid pumps, the boiler water treatment system, the exhaust gas absorption system, the sulfur dissolution system, process water supply and drainage systems, electrical and instrumentation systems, and so on……

The bricks in the sulfur incineration furnace are generally fine; the heating area of the waste heat boiler is also acceptable. However, the tubes need to be cleaned, and a comprehensive pressure test of the boiler system must be carried out. There is significant catalyst pulverization as well as discoloration； The converter should not be a problem; however, corrosion in the heat exchanger, especially in the lower part of its tube bundles, is likely severe, with dirt buildup and discoloration to green. The acid separation unit in the absorption tower is corroded, with 78 units of acid accumulated. Is the acid mist demister dirty, and does it need to be taken apart for cleaning? :'(。 The status of fans, acid pumps, power generation, etc., is very unclear. The boiler water treatment system should be relatively easy to fix even if there are problems. The exhaust gas absorption system uses NaOH; it has glass flake lining on the outside of the chimney steel, and dry and wet flue gases operate alternately. Is this situation unclear and the most difficult to deal with? ! The filter in the sulfur dissolution system is also filled with sulfide – how can it be removed? The rest of the sulfur melting system basically needs to be rebuilt. There is corrosion and penetration in the underground process water supply and drainage pipes, as well as water accumulation on the road surface. What should be done with the 3,000-ton tank of liquid sulfur? ...:funk:

The key is to check the sealing condition when the system is shut down! If it is properly sealed, the system remains clean and no thorough cleaning is required. Otherwise, it has to be completely cleaned! Especially the acid system! The conversion catalyst also needs to be checked! Even more attention must be paid to the inspection of boiler pressure vessels! It’s been four years; a thorough review is necessary! For reference only!

The inspection and maintenance of the entire system must be supervised by individuals with extensive experience in on-site production management. Additionally, a maintenance team that is very familiar with the sulfuric acid system is necessary to ensure the smooth resumption of production. Even the slightest lack of responsibility during maintenance can lead to failure in restarting production! ! ! We learned such a lesson years ago!

Hehe, as long as there is steam in the sulfur area, it’s not a big problem. Check the sulfur incineration furnace; if it looks fine to the eye, just mix everything for a longer period of time at higher temperatures. The catalyst definitely needs to be sifted again, and have someone check its activity to see how it performs. Add some new material and mix it in, as well. Do a leak test on the heat exchanger, circulate the acid system, and make sure to clean the mist eliminators. Conduct individual tests for all sections of the plant, and thoroughly inspect the electrical equipment and instruments

Hehe, it’s not easy and there’s nothing we can do about it. After being shut down for such a long time, it’s unclear how many components have been damaged or ruined. By the way, I see there’s also Xuanda’s low-temperature recovery system; it’s probably connected in parallel as well, so it needs to be circulated properly too!