Due to the technical restrictions associated with the maximum temperatures supported by the fabrics used in filter bags, the need arises cool the suction gases before they enter the bag filter.
For this purpose, there are various technologies, some of which involve the injection of air and/or water. However, these solutions have the disadvantage that they increase the volume of gases, which requires a larger post-cooling installation.
An effective alternative, as long as the characteristics of the gases and the process allow it, is the use of air-to-air tubular coolers.
How Does It Work?
The air-to-air tubular cooler usually has a vertical tower configuration with the gas inlet at the top and outlet at the bottom, although the inverted configuration can also be used.
Hot gases pass through the inside of steel tubes, while ambient air is circulated outside the tubes with the assistance of axial fans. Gas cooling occurs by convection.
With the appropriate instrumentation and control logic, the cooling air flow is regulated to achieve a constant and admissible outlet gas temperature to filter dusty gases.
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