| Canada Blower Co. now offers gas-tight and zero | | | | speed control can be used |
| leakage steam-jacketed blowers for Sulfur | | | | Steam jacketed construction can also be used in |
| Recovery in Cemical Industry. | | | | other thermally critical chemical processes. As to |
| Hydrogen Sulfide H2S is a main source of sulfur. | | | | air-tifgt and zero-emission construction, it is used |
| In high concentrations it can be lethal. It occurs in | | | | in the following industries: |
| natural gas, oil, volcanic emissions, and some | | | | * Pollution Control * Pulp and Paper Industry * |
| mineral springs. In oil rfining processes its presence | | | | Printing and Converting * Chemical Plants * Power |
| is undesirable, and it must be removed. The | | | | Generation * Research and Development * |
| Clause process is one of the methods used to | | | | Petroleum * Food Processing * Paint and Ink |
| remove the hydrogene sulphide, and while doing | | | | Industriesfor containment of hazardous organic |
| so, recover elementar sulfur. | | | | and inorganic compounds in industrial process |
| In pactice this sulfur removal process requires a | | | | plants and other critical applications. Special |
| gas-tight, zero leakage, high temperature and high | | | | construction and shaft sealing devices are available |
| pressure blower for intermittent duty that must | | | | for blower service requiring zero or minimal gas |
| handle toxic gases and must be capable of being | | | | leakage into and out of casing. |
| brought on line immediately upon demand. To do | | | | Canada Blower has a lot of experince with |
| this the following features on the blower must be | | | | gas-tight and zero-leakage construction on fans |
| provided: | | | | and blowers, including: multistage lip shaft seals; |
| - Double welded casing construction; - Steam | | | | Buna-N, Viton and Teflon seals; mechanical shaft |
| flows between the housing walls to maintain a | | | | seals; special fan housing gasketings; single and |
| constant 285 F gas temperature inside the fan | | | | double carbon ring seals; hermetically sealed |
| (because below 285 F sulfur will change from a | | | | blowers; magnetofluidic and ferrofluidic seals; and |
| gaseous to a solid state and will "freeze" to the | | | | packed stuffing boxes with barrier liquids and |
| blower surfaces causing damage or destruction); - | | | | purgeable seals. |
| A mechanical shaft seal with heat tracing and | | | | Specific code welding processes and special fan |
| purge by air or nitrogen; - To assure tight | | | | design features are used too - to ensure |
| tolerances between the shaft and shaft seal, the | | | | complete gas tight integrity. |
| housing should be supported at the centerline, and | | | | Some special materials and alloys frequently used |
| grows concentric to the fan shaft when exposed | | | | in gas tight fans, especially for service in |
| to heat.: since this support isolates housing from | | | | hazardous, abrasive, corrosive and high |
| the drive and mounting bases, housing thermal | | | | temperature environments, include: |
| growth doesn't cause forces to be applied to | | | | Corten, ASTM A36 Carbon Steel, Hastelloy, |
| these bases. - To prevent the shaft from taking | | | | Inconel, Stainless Steels of different kinds, |
| a permanent set when the blower is idle but still | | | | Titanium, Monel, Aluminum, Teflon, Rubber LIning. |
| exposed to the high temperature, a turning gear | | | | These materials are typical for industrial |
| is provided to keep the blower rotating at a very | | | | applications requiring high strength alloys and super |
| slow speed of 25 - 40 RPM; alternatively a VFD | | | | alloys too. |