Vaporization frame sealed

The main reason is to reduce the strain on operators during winter, but there are also cases in the northern regions where the gasification systems are not enclosed, so it’s unclear how they will cope through this winter.

Firstly, it is not permissible from a safety perspective for the gasification framework to be enclosed; it likely has not passed the safety inspections. However, considering the climate conditions in northern China, the devices may stop functioning if they are not enclosed. In light of this, some manufacturers adopt a semi-enclosed design, or take measures such as positioning other devices on the upwind side of the main wind direction within the gasification framework during the design process. So, regarding the climate requirements asked by the original poster, the answer is simply that safety does not permit it.

It serves to prevent freezing, as well as to protect against strong winds

The fire protection code for coal chemical plant design has already removed the provision prohibiting the sealing of high-rise Class A factories, but for some reason this code has not been issued yet.

According to current regulations, areas over 24m are not allowed to be enclosed

Semi-enclosed; furthermore, it must comply with the building design fire protection codes – it’s too cold in winter, making it impossible for people to operate it

During the previous design process, the sealing of the upper layers was primarily aimed at facilitating operations and preventing freezing of liquids; however, issues such as explosion relief presented difficulties during the design phase. According to the latest building codes, high-rise Class A factories are not permitted, so in future designs, the gasification frameworks in the northern regions must also be open

That's absolutely true. The owners mainly considered the operating and maintenance conditions in cold weather; the regulations do not allow for enclosures. It will eventually be sealed off; presumably, the owner will do so on their own after it passes the inspection.

(From the draft of the Fire Protection Code for Coal Chemical Engineering Design) 5.2 Height, Number of Floors, and Area of Buildings 5.2.1 Units for coal powder preparation, gasification, coal slurry preparation, treatment of gasification ash water, preparation of oil-based coal slurries from direct coal liquefaction, and the production of catalysts using coal as a raw material often require a large number of floors and high heights due to the demands of the processes and equipment layout; in addition, some areas need to be enclosed. Such facilities typically incorporate inherent safety measures in terms of process design and equipment, and with the addition of other measures such as automatic alarms, fire suppression systems, and ventilation, it is possible to effectively prevent and control the occurrence of hazardous incidents. Therefore, this regulation states that, provided that the process requirements are met and effective safety measures are taken, there are no restrictions on the number of floors or height of such buildings. Inherent safety measures include things such as: 1) The selection of materials for equipment and pipelines should take into account the effects of the process media and airflows, and reliable protective measures should be implemented in those critical areas where operating conditions are particularly demanding； 　2) The plant process utilizes a Distributed Control System (DCS), along with automatic control measures such as regulation, alarm functions, and safety interlocks. To ensure the reliability of these safety measures and prevent missed reports of accidents, a redundant design, multi-parameter monitoring, and design based on the most adverse conditions are employed in the design process ； Relevant measures and regulations can be found in chapters such as Chapter 6 \"Process Units and System Components\", Chapter 8 \"Piping Layout\", Section 10.3 \"Fire Alarm Systems\", Section 10.5 \"Lightning Protection\", Section 10.6 \"Anti-static Measures\", and Section 11.2 \"Ventilation and Dust Removal\" of this specification. For the partially enclosed spaces in such factories, strict fire and explosion prevention measures should be taken: 1) In Class A or Class B factories, the scope of these enclosed spaces should be strictly limited; 2) Windows should be installed on the exterior walls facing the prevailing wind direction over an area as large as possible, and these windows should remain open for ventilation unless maintenance is required; 3) Light-weight partition walls should be used to ensure effective explosion venting, thereby reducing the destructive impact of explosions and preventing serious casualties and economic losses due to damage to the factory’s structural elements; 4) Flammable gas detectors should be installed at areas where leaks are likely to occur or where hazardous gases tend to accumulate; 5) Mechanical ventilation systems should be installed in areas where flammable gases are likely to accumulate and where natural ventilation is insufficient. When a flammable gas detector detects a leak, it should trigger the ventilation fans in that area to dilute the concentration of harmful substances in the air; 6) Necessary fire detectors should be installed, along with a fire suppression system that is compatible with the properties of any leaks from pipes or equipment in that area; 7) The equipment and its pipelines should be grounded to prevent static electricity, and appropriate lightning protection measures should also be taken