Cooling process of heat reactivated desiccant air dryer systems using blower purge and method therefore

A system for regenerating desiccant in an air dryer comprising:

• a means to produce a primary high heating period of about degrees 430° F. and a secondary low heating period of about 225° F. of purge air flows to a bed of desiccant within at least one tower vessel of said air dryer;
• said purge air flow directed to at least one vessel containing desiccant to achieve a high heat of about 400° F. and a low heat of about 200° F. at the vessel entry area;
• a means to measure heater discharge temperatures and bottom vessel temperatures;
• a means to measure desiccant bed bottom area temperature and read said high and low heating as it progresses through the desiccant bed, means to dry purge for deep cooling, and a means to measure dew point;
• wherein said bottom vessel is operatively arranged to achieve temperatures to maintain deep cooling of the desiccant bed and terminate dry purging;
• wherein, said primary high heating is achieved at a set point of about 400° F. for a period of blower purging and is immediately terminated and followed by a secondary low heating set point of about 200° F. for a period of blower purging to complete the heating phase in regenerating the desiccant, and, a means to terminate said low secondary heating period of blower purging and begin said dry purge means of at least one tower vessel within said air dryer for deep cooling, enabling the system to be cooled and repressurized and returned to a dryer mode cycle of operation.

A system process and apparatus for regenerating desiccant in an air dryer device comprising;

• a means to produce a primary high heating period of about 400° F. to high purge temperatures and a secondary low heating period about 225° F. of purge air flows to a bed of desiccant within at least one tower vessel of said air dryer to start to cooling process;
• said purge air flow directed to a twin tower vessel configuration of a dryer system containing desiccant and achieve a high heat of about 400° F. and a low heat of about 200° F. at the vessel entry area during regeneration;
• means to measure heater discharge temperatures or the high and low temperature set points, and bottom vessel temperature sensing means;
• means to measure desiccant bed bottom area temperature and read said high and low heating as it progresses through the desiccant bed, means to dry purge for deep cooling elimination the opportunity for blower ambient air re-loading moisture in the desiccant bed being regenerated, and a means to measure dew point of the regenerated desiccant bed;
• said bottom vessel temperatures operatively configured to maintain the deep cooling process of the desiccant bed dryness and terminate dry purging early when dryness is accomplished;
• wherein, said primary high heating set point of about 400° F. for a period of blower purging is configured to terminate high heat period and immediately start said secondary low heating set point at about 200° F. for a period of blower purging to complete the heating phase in regenerating the desiccant, and, said low heating period of blower purging configured to terminate low heat period and immediately start said dry purge period of the process enabling the system to be cooled and repressurized.