Applications of Stainless Steel Centrifugal Fans in Hazardous Areas

Applications of Stainless Steel Centrifugal Fans in Hazardous Areas

Stainless steel centrifugal fans are employed in hazardous zones within industries such as oil tankers, offshore oil platforms, and petrochemical plants. In these environments, to prevent combustion or explosions during heating and ventilation processes in such hazardous locations while improving working and living conditions, explosion-proof heaters must be selected. These systems consist of explosion-proof fans and air heaters. The stainless steel centrifugal fan system provides heating, while the air heater handles heat dissipation. Through the forced action of the heater, outdoor (or indoor) air is drawn into the unit, flows through the air heater, and is delivered to the interior after heating to maintain a specific indoor temperature. This enables rapid heating of indoor air, with a significantly larger coverage area and heat output compared to conventional radiators. Additionally, temperature distribution is more uniform than radiators, making it particularly suitable for spacious rooms and workshops. Depending on the heat medium, air heaters are categorized into steam-type and hot water-type, with numerous models and methods available. Stainless steel centrifugal fans: Based on steam pressure, they can be classified as high-pressure (>0.7 bar gauge) and low-pressure (≤0.7 bar gauge) (typically limited to 3 bar gauge for safety reasons). Stainless steel centrifugal fans generally utilize saturated steam. Within the heater, steam primarily releases latent heat through condensation. During this process, the temperature remains constant, and the latent heat released by steam condensation is significantly greater than that released by the same amount of water at the same temperature. For instance, at an absolute pressure of 1 atm, the amount of condensed steam decreases significantly. At 1 atm absolute pressure, the weight ratio of saturated steam to water is approximately 1:1. In stainless steel centrifugal fans, an increase in steam pressure corresponds to a rise in temperature, though the latent heat of vaporization slightly decreases. Utilizing high-pressure steam as a heat transfer medium reduces required heater surface area while increasing the necessary steam volume. Slightly. Water Heaters: Based on hot water heating systems, they can be categorized into natural (gravity) and mechanical circulation types. After heat dissipation from the heater, hot water returns to the boiler via the return pipe under gravity. Circulation pump. During the circulation process, water continuously absorbs heat from the boiler and releases heat from the heater. Subsequently, to achieve heating objectives, the fan forcibly maintains indoor temperatures. Stainless steel centrifugal fans are typically mounted on interior walls, directing airflow toward exterior walls or windows. As shown in Figure 2A, this configuration minimizes cold air infiltration. For larger spans, placing the heater centrally in the room ensures uniform temperature distribution. The critical technical requirement is that the fan, motor, and starter must meet explosion-proof standards. Currently, China lacks national standards for explosion-proof heater rentals, resulting in no officially certified products in this category. To ensure safe and reliable operation in hazardous areas, custom design and manufacturing can be undertaken. Such solutions should comply with domestic and international specifications, standards, or technical requirements for explosion-proof equipment