Method for evaluating performance of chemical filter for cleaning gas
First Claim
1. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
- determining at least one of a moisture content and a weight of a filter element including an ion exchanger;
comparing the determined value of a moisture content or a weight with a prescribed value of a moisture content or a weight;
replacing the filter element when the determined value is equal to or less than the prescribed value; and
waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step;
wherein the prescribed value of a moisture content or a weight is smaller than an initial value of a moisture content or a weight of the filter element.
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Accused Products
Abstract
A method for evaluating performance of a chemical filter element is disclosed. A moisture content, a weight or a pressure loss of a filter element including an ion exchanger is determined, and the determined value is compared with a prescribed value. Alternatively, the determined value is converted into a residual ion exchange capacity of the filter element, and the residual ion exchange capacity is compared with a prescribed value. When the determined value or the residual ion exchange capacity is equal to or less than the prescribed value, the filter element is exchanged. On the other hand, when the determined value or the residual ion exchange capacity is more than the prescribed value, after waiting a prescribed period, the determining step and the comparing step are repeated.
18 Citations
42 Claims
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1. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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determining at least one of a moisture content and a weight of a filter element including an ion exchanger; comparing the determined value of a moisture content or a weight with a prescribed value of a moisture content or a weight; replacing the filter element when the determined value is equal to or less than the prescribed value; and waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step; wherein the prescribed value of a moisture content or a weight is smaller than an initial value of a moisture content or a weight of the filter element. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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determining at least one of a moisture content and a weight of a filter element including an ion exchanger; converting the determined value of a moisture content or a weight into a residual ion exchange capacity of the filter element; and comparing the residual ion exchange capacity with a prescribed value. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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providing a filter element including an ion exchanger in a gas passage; determining a pressure difference between an upstream and a downstream of the filter element; comparing the determined value of a pressure difference with a prescribed value of a pressure difference; replacing the filter element when the determined value is less than the prescribed value; and waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step; wherein the prescribed value of a pressure difference is smaller than an initial value of a pressure difference between an upstream and a downstream of the filter element. - View Dependent Claims (19)
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20. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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providing a filter element including an ion exchanger in a gas passage; determining a pressure difference between an upstream and a downstream of the filter element; converting the determined value of a pressure difference into a residual ion exchange capacity; and comparing the residual ion exchange capacity with a prescribed value. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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providing a filter element including an ion exchanger in a gas passage; determining a pressure difference between an upstream and a downstream of the filter element; comparing the determined value of a pressure difference with a prescribed value of a pressure difference; determining at least one of a moisture content and a weight of the filter element when the determined value of a pressure difference is equal to or less than the prescribed value; and waiting a prescribed period when the determined value of a moisture content or a weight is more than the prescribed value and repeating the pressure-difference determining step, and the comparing step subsequent to the waiting step; wherein the prescribed value of a pressure difference is smaller than an initial value of a pressure difference. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprises the steps of:
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providing a filter assembly including an ion exchanger in a gas passage, wherein said filter assembly comprises a housing, and the filter element is fixed to the housing; determining a pressure difference between an upstream and a downstream of the filter element; comparing the determined value of a pressure difference with a prescribed value of a pressure difference; replacing the filter assembly when the determined value is equal to or less than the prescribed value; and waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step; wherein the prescribed value of a pressure difference is smaller than an initial value of a pressure difference between an upstream and a downstream of the filter element.
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40. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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providing a first filter element including an ion exchanger in a gas passage, wherein another filter element is provided in an upstream of the first filter element; determining a pressure difference between an upstream and a downstream of the first filter element; comparing the determined value of a pressure difference with a prescribed value of a pressure difference; replacing the first filter element when the determined value is equal to or less than the prescribed value; and
waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step;wherein the prescribed value of a pressure difference is smaller than an initial value of a pressure difference between an upstream and a downstream of the first filter element.
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41. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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providing a filter element including an ion exchanger in a gas passage, wherein the ion exchanger comprises an ion exchange group having strong acidity or strong basicity; determining a pressure difference between an upstream and a downstream of the filter element; comparing the determined value of a pressure difference with a prescribed value of a pressure difference; replacing the filter element when the determined value is equal to or less than the prescribed value; and waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step; wherein the prescribed value of a pressure difference is smaller than an initial value of a pressure difference between an upstream and a downstream of the filter element.
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42. A method for evaluating performance of a chemical filter element for cleaning a gas, which method comprising the steps of:
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providing a filter element including an ion exchanger in a gas passage, wherein the ion exchanger is made by irradiation-induced graft polymerization; determining a pressure difference between an upstream and a downstream of the filter element; comparing the determined value of a pressure difference with a prescribed value of a pressure difference; replacing the filter element when the determined value is equal to or less than the prescribed value; and waiting a prescribed period when the determined value is more than the prescribed value and repeating the determining step and the comparing step subsequent to the waiting step; wherein the prescribed value of a pressure difference is smaller than an initial value of a pressure difference between an upstream and a downstream of the filter element.
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Specification