Fan
Fans play a vital role in ventilation, air circulation, cooling and fume extraction, helping to maintain a safe working environment and supporting a variety of chemical processes. These fans include axial and centrifugal (radial) fans, which are designed for high-volume, low-pressure applications, conveying air along the axis; and conveying perpendicular to the air inlet for high pressure and handling contaminated air. Key features of fans in this industry include corrosion resistance (usually achieved through special materials or coatings), explosion-proof designs for hazardous areas, high temperature resistance, and robust seals and bearing systems to prevent leakage. Its applications range from general area ventilation and reactor fume extraction to providing air for combustion and treating exhaust gases in environmental protection systems. The selection of chemical fans is critical and requires careful consideration of process parameters (flow, pressure, temperature, media characteristics), energy efficiency and reliability, as well as continuous innovation, focusing on smart upgrades, green technology and customized designs to meet the changing needs of the chemical industry.
| Equipment type | Classification method | Features | Application scenario |
| Centrifugal fan | Classification by working principle | The gas gains kinetic energy and potential energy through the rotation of the impeller. The gas enters the impeller radially and flows out tangentially. Centrifugal fans have the characteristics of high wind pressure, wide flow range, and compact structure. | Applicable to occasions requiring higher wind pressure, such as boiler blast, industrial furnace ventilation, induced draft of dust removal system, etc. |
| Axial flow fan | Classification by working principle | The gas enters the impeller along the axial direction and flows out along the axial direction. Axial flow fans have the characteristics of large flow, low wind pressure, and high efficiency, and are suitable for occasions with large flow and low wind pressure. | Commonly used in cooling towers, air conditioning systems, ventilation ducts, etc. |
| Mixed flow fan | Classification by working principle | The gas enters the impeller along a direction between axial flow and centrifugal flow, and flows out along the tangential direction. The mixed flow fan combines the advantages of centrifugal fans and axial flow fans, and the wind pressure and flow rate are between the two. | It is suitable for ventilation, smoke exhaust and other occasions, such as ventilation systems in high-rise buildings, tunnel ventilation, etc. |
| Diagonal flow fan | Classification by working principle | The gas enters the impeller along the diagonal direction and flows out along the diagonal direction. The wind pressure and flow characteristics of the diagonal flow fan are between the axial flow fan and the centrifugal fan. | It is suitable for occasions requiring medium wind pressure and flow, such as air conditioning units, ventilation systems, etc. |
| Cross-flow fan | Classification by working principle | The gas enters the impeller along the horizontal direction and flows out along the horizontal direction. The airflow direction of the cross-flow fan is perpendicular to the impeller axis, with a compact structure and suitable for installation in a small space. | Commonly used in small air-conditioning equipment, household appliances, etc. |
| Suction fan | Classified by gas flow direction | The gas is sucked into the fan, usually used for negative pressure operation. | Such as induced draft fan, dust exhaust fan, etc. |
| Pressure-type fan | Classified by gas flow direction | The gas is pressed into the fan, usually used for positive pressure operation. | Such as blowers, ventilation fans, etc. |
| Horizontal fan | Classified by installation method | The fan axis is installed horizontally, occupying a large area, but easy to install and maintain. | Applicable to occasions where space allows, such as factory workshops, large ventilation systems, etc. |
| Vertical fan | Classification by installation method | The fan axis is installed vertically, occupying a small area, but the installation and maintenance are relatively complicated. | Suitable for occasions with limited space, such as ventilation systems in high-rise buildings, small equipment, etc. |
| Roof fan | Classification by installation method | Installed on the roof of a building for ventilation and smoke exhaust, usually with a rainproof and windproof design. | Such as ventilation and smoke exhaust systems in high-rise buildings. |
| References | Authors | Abstract | DOI |
| Application of Laser Alignment Instrument in Alignment of Centrifugal Pumps and Blowers in Chemical Industry | Wang Shuli | Centrifugal pumps and blowers are typical high-speed rotating equipment commonly used in the chemical industry. The driving machine and the driven machine are connected by a diaphragm coupling. For large-scale high-speed rotating machinery, centering (alignment) is a very important maintenance link. The traditional method of installing and aligning dial indicators requires a lot of manpower and material resources, and the time cycle is also very long. With the development of science and technology, in recent years, the application of laser centering technology in the installation and alignment process has become more and more extensive. This technology has the characteristics of convenience, speed, accuracy and efficiency. | CNKI:SUN:TYJS.0.2013-05-031 |
| Analysis and prevention of early corrosion failure of salt chemical fan impeller | Sun Shaodong, He Shijian, Chen Wei, Shu Yun, Wang Xiang, Wu Xinqiang | The results show that the failure of the impeller is caused by stress corrosion cracking under the action of Cl-; after the spoiler is welded to the impeller body, the welding thermal cycle causes a significant change in the impeller body structure near the fusion line, the precipitation of the second phase causes the corrosion resistance of the impeller body to decrease, and stress corrosion cracking occurs under the combined action of working stress and welding residual stress; the working stress distribution on the impeller body is uneven, the closer to the impeller center, the greater the working stress, and the easier it is to induce stress corrosion cracking; a preventive measure of removing the four spoilers near the impeller center is proposed, and it is verified in production that this measure can prevent early stress corrosion cracking of the impeller. | 10.11973/jxgccl201710021 |
| Application of Bionic Technology in Noise Reduction of Chemical Ventilators | Liu Yanbin | Bionic technology is a chemical technology that has gradually developed in recent years and plays an important role in the development of many links in chemical production. Bionic technology also plays an important role in the noise reduction of chemical ventilators, which can effectively improve the air volume and work efficiency of ventilators. In the design process of the fan blade surface, the non-smooth surface morphology of the organism can be fully utilized to realize the non-smooth treatment process of the blade surface, thereby achieving an effective noise reduction effect. At the same time, bionic technology can also effectively solve the noise pollution problem faced by chemical companies. | 10.3969/j.issn.1674-5167.2015.10.180 |
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