Method and device for drying of moist gases
OwnerRoderich Wilhelm Graeffinventor
Life of this patent
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Abstract
A process and an apparatus are described for drying moist gas, in particular air, in which the moisture is removed from the gas by a desiccant and the desiccant is freed of the absorbed moisture by a hot regeneration gas. In order to improve the energy balance in the drying of moist gas, in particular air, it is provided that the throughput of regeneration gas through the desiccant is controlled as a function of the temperature of the regeneration gas leaving the desiccant. An apparatus suitable for carrying out the process contains a temperature sensor arranged in the regeneration exhaust gas stream, which temperature sensor controls a device determining the regeneration gas throughput through the desiccant.
Claims21
A process for drying a moist gas by first removing moisture from the gas by passing the moist gas through a desiccant, and then freeing said moisture picked up by the desiccant from the moist gas by passing a hot regeneration gas through the desiccant, the process comprising,
- heating the regeneration gas to a predetermined input temperature and inputting the heated regeneration gas to and through the desiccant;
- measuring the temperature of the exhaust regeneration gas that afflues from the desiccant during a last phase of regeneration;
- adjusting the amount of regeneration gas that is input to the desiccant while maintaining the temperature of the inputted regeneration gas at said predetermined input temperature until the temperature of the exhaust regeneration gas reaches a predetermined exhaust gas temperature and continuing the adjusting so as to maintain the temperature of the exhaust regeneration gas at said predetermined exhaust gas temperature.
An apparatus for drying a moist gas comprising:
- a vessel for receiving a desiccant through which moist gas is passed to remove the moisture from the moist gas;
- fan means for feeding moist gas to said vessel;
- a regeneration gas line for feeding heated regeneration gas to said vessel and through the desiccant to free said moisture picked up by the desiccant from the moist gas;
- heating means for heating the regeneration gas to a predetermined input temperature;
- a control device for controlling the throughput of heated regeneration gas that is fed to the vessel and through the desiccant;
- an exhaust regeneration gas line for receiving the regeneration gas that is passed through the desiccant within the vessel, said exhaust regeneration gas line being open to the atmosphere;
- temperature sensing means for measuring the temperature of the exhaust regeneration gas including a sensor positioned to detect the temperature of the exhaust regeneration gas,
- wherein said sensor is connected with said control device for adjusting the throughput of the regeneration gas that is input to the vessel through the regeneration gas line, while maintaining the temperature of the heated regeneration gas at said predetermined temperature, until the temperature of the exhaust regeneration gas reaches a predetermined exhaust gas temperature.
Dependencies are inferred from the claim text.