During the evaluation of ammonia synthesis plants, discussions on the problems encountered
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Most small and medium-sized ammonia synthesis plants were built in the 1960s to 1970s. Due to the conditions at that time and their relatively small design scale, these plants have been continuously expanded as the economy has developed. There are many problems in the process of obtaining a work safety license. For example: the explosion protection issues of the motor in the high-pressure pump, safety distances in the layout, fire resistance ratings, and so on.
The motors used in high-pressure compressors are now mostly synchronous motors. Explosion protection is achieved through positive pressure ventilation of the commutator rings; it is difficult to ensure proper fire separation distances in the layout design, and such units must be removed if they are located near major hazard sources. Other preventive measures include sealing doors and windows. High standards are generally required for the fire resistance rating of buildings; in many older enterprises, there are still many wooden beams and roofs that need to be removed and replaced.
I completely agree! Such enterprises face not only the above problems but also issues related to distances from surrounding areas that do not meet the required standards, as cities develop and are constructed. For such enterprises, it is best to provide funding and implement policies for relocation; otherwise, it will be difficult for them to meet the evaluation criteria.
The issue of explosion-proof electrical equipment is one aspect; as mentioned above, the most difficult part to handle is the spacing issue. An evaluation of a fertilizer plant was conducted at the end of 05; when the time frame left was insufficient, it was recommended that the plant relocate. Now that it’s time to renew the license, we can’t possibly recommend relocation again
For businesses of this type, it’s difficult to come up with effective safety measures. In many cases, there isn’t even any original documentation for the old equipment, and subsequent inspection and testing also present problems
I’m not very familiar with ammonia synthesis; the safety regulations for small-scale nitrogen fertilizers still apply, but the key issue is that there are no safety regulations specific to large-scale nitrogen fertilizers.
Explosion-proof electrical equipment must be rectified, small motors must be replaced, and large motors must be modified with positive pressure ventilation； The problem that causes headaches is still the issue of safety distances. On one hand, inadequate implementation of the safety principles of \"simultaneous planning, construction, and operation\" during technical upgrades results in facilities that do not meet the required standards from the start. On the other hand, this problem arises due to the continuous development of surrounding villages, which the factory is unable to control. There really is no solution to such issues! ! ! !
The small motors are somewhat better, but the electric fans and wiring require extensive repairs
It’s indeed difficult to deal with such old enterprises; it causes headaches for everyone. If you prevent them from operating, many people will be affected. After all, social stability comes first. But if you allow them to operate, who will be held responsible if problems arise?
There are too many non-explosion-proof electrical devices in ammonia synthesis plants; it’s not just a problem with the high-pressure motor. Moreover, this is a widespread problem across the country, one that stems from historical factors. In our view, companies make progress year by year, and safety conditions continue to improve rather than deteriorate; therefore, companies should be allowed to monitor their operations.