System for preventing unnecessary shutdown of a high-purity gas production plant
First Claim
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1. A system for preventing an equipment failure from a potentially catastrophic exothermic reaction in a gas purifier bed, comprising:
- providing one or more dual temperature sensors at various locations in the purifier bed having one or more inlet and outlet valves and, wherein a first set of temperature measuring devices are disposed in close proximity to a corresponding second set of temperature measuring devices forming part of each individual dual temperature sensor;
selecting a first predetermined temperature differential between a first and second temperature measuring device for each individual dual temperature sensor;
selecting a second predetermined temperature;
preventing failure by shutting down the gas purification bed upon determining that the differential between the first and the second temperature measuring device in each of the dual temperature sensors is below the first predetermined temperature differential but wherein the first and the second temperature measuring device of any of said dual temperature sensors exceeds the second predetermined temperature, thereby closing the inlet and the outlet valves to isolate the bed.
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Abstract
A novel fail-safe temperature monitoring system that can distinguish excessive chemical adsorbent temperature from temperature sensing component failure is provided. This system prevents the gas purifier from shutting down as a result of temperature sensing component failure, and thereby prevents a false shutdown of a high-purity gas production plant.
13 Citations
18 Claims
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1. A system for preventing an equipment failure from a potentially catastrophic exothermic reaction in a gas purifier bed, comprising:
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providing one or more dual temperature sensors at various locations in the purifier bed having one or more inlet and outlet valves and, wherein a first set of temperature measuring devices are disposed in close proximity to a corresponding second set of temperature measuring devices forming part of each individual dual temperature sensor; selecting a first predetermined temperature differential between a first and second temperature measuring device for each individual dual temperature sensor; selecting a second predetermined temperature; preventing failure by shutting down the gas purification bed upon determining that the differential between the first and the second temperature measuring device in each of the dual temperature sensors is below the first predetermined temperature differential but wherein the first and the second temperature measuring device of any of said dual temperature sensors exceeds the second predetermined temperature, thereby closing the inlet and the outlet valves to isolate the bed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus designed for preventing failure in a gas purification bed due to an exothermic reaction, comprising:
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a gas purification bed having one or more inlet and outlet valves and one or more dual temperature sensors at various locations in the gas purification bed, each of the one or more dual temperature sensors having two temperature measuring devices in close proximity to one another; the two temperature measuring devices in each of the one or more dual temperature sensors being connected to separate temperature receiving computer cards; and a program logic controller configured to monitor an exothermic reaction in the gas purification bed based on (i) a first predetermined temperature differential between the temperature measuring devices of each dual temperature sensor; and
(ii) temperatures measured by the two measuring devices of one of said dual temperature sensors exceeding a second predetermined temperature;wherein the program logic controller is configured for preventing failure by shutting down the gas purification bed upon the controller determining that the differential between the two temperature measuring devices in each of the one or more dual temperature sensors is below the first predetermined temperature differential but wherein the two measuring devices of any of the dual temperature sensors exceeds the second predetermined temperature, thereby causing the controller to transmit a signal to close the inlet and the outlet valves to isolate the bed. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification