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