JP2012213700A - Apparatus for evaluating filtration performance of high temperature water and method for filtering high temperature water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for evaluating filtration performance which can accurately evaluate filtration performance of a filtration element used for filtration of high temperature water and to provide a method for filtering high temperature water by which filtration can be efficiently carried out by using the filtration element selected by the apparatus for evaluating filtration performance.SOLUTION: A first filtration element 6a is attached to a high temperature tester 11 provided at a high temperature testing water channel L2 branched from a high temperature water system L1 to evaluate filtration performance of high temperature water and a second filtration element 6b is attached to a low temperature tester 12 provided at a low temperature testing water channel L3 branched from a downstream side of a cooler C1 to evaluate filtration performance of low temperature water. Filtration performance at the high temperature water system L1 is estimated from both evaluation results and the filtration element 6 to be used at a filter 2 provided at the high temperature water system L1 is selected and filtration is carried out.

Description

  The present invention relates to a filtration performance evaluation apparatus for evaluating the filtration performance of a filtration element used for filtration of high-temperature water, and a filtration method using the evaluated filtration element, in particular, a thermal power or a condensate treatment system for a nuclear power plant, etc. The present invention relates to a filtration performance evaluation apparatus and a filtration method for evaluating the filtration performance of a filtration element used for filtration of high-temperature water.

  In the condensate treatment system of thermal power or nuclear power generation equipment, the iron condensate and other impurities are contained in the condensate, so the iron clad and other SS components are removed by the filtration device, and the salt is removed by the desalination device. Treated water that has undergone water treatment is supplied to the boiler as feed water. In such condensate treatment system filtration, it is required to filter high-temperature water, and a filter having a filtration element is used for filtration, and filtration is continued by replacing the filtration element with reduced filtration performance. Since high temperature water is at a high pressure in order to maintain a liquid state at 100 ° C. or higher, it may be indicated as high temperature (high pressure) water.

  Filtration for high-temperature water requires a filter element that can withstand high-temperature water. However, in advance, only whether or not the material can withstand high-temperature water is examined, and it is determined that the material can withstand high-temperature water. The selected filter element was selected and installed in an actual apparatus, and applied to actual high-temperature water system filtration. Since the filtration performance of such a filtration element decreases with the operation of the actual device, as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-184232), the filtration performance is evaluated during the operation of the actual device. Filtration is continued by exchanging the filtration element having decreased.

  In filtration for high-temperature water, it is important that the material of the filtration element is resistant to high-temperature water, but the problem of filtration performance in high-temperature water is more important than that. The filtration performance for the SS component in the water to be treated is different from the filtration performance for room temperature water. This is largely due to the difference in chemical form change of the substance in addition to the physical difference simply due to temperature rise.

  The change in chemical form of a substance in high-temperature water occurs even with calcium compounds, silicic acid compounds, etc., but particularly appears with iron compounds. As iron compounds in water, iron oxide and iron hydroxide are generally used. However, in high-temperature water, iron valence, bonding state, dissociation, solubility, and the like are often different from room-temperature water. Accordingly, even in the water to be treated having the same composition, the filterability is different between high-temperature water and room-temperature water, and different filtration performance can be obtained even if filtration is performed with the same filtration element.

  The filtration element is manufactured and sold so as to obtain a specific filtration performance. The filtration performance is tested with room temperature water having a specific composition, and the obtained data is a guaranteed value. When selecting a filter element for a specific high-temperature water such as condensate in a power plant, select it based on the manufacturer's guaranteed value, and test it with normal-temperature water having a composition corresponding to the high-temperature water. The performance is judged and the heat resistance and pressure resistance are tested and selected in the immersion test in high-temperature water without passing water.

  The filtration element selected in this manner is mounted on an actual apparatus as it is and applied to actual high-temperature water system filtration. However, the filtration characteristics in actual high-temperature water are different from those in room-temperature water, and filtration is performed with filtration characteristics different from those predicted with room-temperature water. Since the filtration characteristics and lifespan in such actual high-temperature water are different from the predictions in room temperature water, as shown in Patent Document 1, the filtration performance is evaluated during the operation of the actual apparatus, and the filtration performance decreases. It was necessary to replace the filter element.

  In conventional high-temperature water filtration, even with a filtration element selected based on the filtration characteristics predicted with room-temperature water, the temperature (pressure), flow rate, etc. The final filtration performance cannot be grasped unless the difference in filtration characteristics under the condition changing condition is examined. For this reason, in selecting, a filtration element suitable for an actual high-temperature (high-pressure) water system was selected, and there was a problem that high-temperature water could not be efficiently filtered in an actual apparatus.

JP 2010-184232 A

  An object of the present invention is to efficiently and accurately evaluate whether or not the filtration element to be used has a filtration performance that can be used for filtration of high-temperature water in order to solve the conventional problems as described above. It is to propose a filtration method for high-temperature water that can be efficiently filtered using a filtration performance evaluation device that can be used, and a filtration element selected thereby.

The present invention provides the following high-temperature water filtration performance evaluation apparatus and filtration method.
(1) A device for evaluating the filtration performance of a filtration element attached to a filtration device provided in a high-temperature water system,
A high-temperature test channel branched from the high-temperature water system;
A low-temperature test channel branched from the high-temperature test channel through the first cooling device;
A high-temperature test apparatus provided in the high-temperature test water channel so as to filter the high-temperature water by attaching the first filtration element;
A low-temperature test device provided in the low-temperature test water channel so as to filter the low-temperature water by attaching the second filtration element;
A first sampling channel communicating between the first cooling device of the low temperature test channel and the low temperature test device;
A second sampling path that communicates with the downstream side of the high temperature test device in the high temperature test water channel via a second cooling device;
A filtration performance evaluation apparatus, comprising: a third sampling path connected to the downstream side of the low temperature test apparatus of the low temperature test water channel.
(2) The device according to (1), further comprising a control device configured to perform a test by applying a load so as to apply the same differential pressure to the high temperature test device and the low temperature test device.
(3) The apparatus according to (1) or (2) above, wherein a heating device is provided in front of the high temperature test device for the high temperature test water channel.
(4) The apparatus according to any one of (1) to (3), wherein the first to third sampling paths are provided with a membrane filter that captures SS particles and measures the particle diameter thereof.
(5) The apparatus according to any one of (1) to (4), wherein a heat insulating material is attached to the outside of a pipe constituting the high temperature test water channel branched from the high temperature water system.
(6) Using the filtration performance evaluation apparatus according to any one of (1) to (5) above,
The first filtration element is attached to the high-temperature test device provided in the high-temperature test channel that branches from the high-temperature water system, the high-temperature water is filtered, and the filtration performance in the high-temperature water is evaluated.
A low temperature test device provided in a low temperature test channel that branches from the high temperature test channel through the first cooling device is equipped with a second filtration element to filter the low temperature water, and the filtration performance in the low temperature water is evaluated.
From the evaluation results in high-temperature water and the evaluation results in low-temperature water, predict the filtration performance in the high-temperature water system, select the filtration element to be used in the high-temperature water system,
A high-temperature water filtration method comprising: filtering a high-temperature water by attaching the selected filtration element to a filtration device provided in the high-temperature water system.

  In the present invention, the high-temperature water to be treated is high-temperature water whose filtration characteristics are different from normal temperature and normal-pressure water, and in some cases is high-pressure water, and the temperature during filtration is preferably 80 to 200 ° C. The temperature is 100 to 150 ° C., and the pressure is a pressure at which the high-temperature water keeps the liquid phase. Generally, the pressure is about normal pressure to 3 MPa. Here, the normal pressure is a pressure obtained by adding a differential pressure component for filtration to atmospheric pressure. In the present invention, the high-temperature water system that performs filtration is an aqueous system that retains such high-temperature water, and examples thereof include a condensate treatment system, but other water systems may also be used.

  The condensate treatment system is a system that includes boilers (steam generators) such as thermal power or nuclear power generation equipment, and condensate generated by condensing steam emitted from a condenser (condenser), iron clad by filtration equipment, etc. This is a treatment system that performs condensate treatment such as removal of SS components and removal of salts by a desalting apparatus, and supplies treated water to the boiler as feed water. The temperature and pressure of such a condensate treatment system are the temperatures and pressures as shown for the high-temperature water, and condensate filtration is performed on the condensate having such a temperature and pressure.

  The condensate generated in such a condensate system contains silica, calcium, and other salts that are brought in from steam, iron clad that is brought in from boilers, condensers, pipes, and other SS components. The filtration characteristics of the SS component contained in such condensate are different from the filtration characteristics when normal temperature and normal pressure water is filtered. Particularly, iron clad and other iron components have large differences in filtration characteristics due to differences in iron valence, bonding state, dissociation, solubility, and the like depending on temperature and pressure. For this reason, the filtration characteristics in high temperature (high pressure) condensate cannot be predicted by the filtration performance at normal temperature and the filtration test results.

  The filtration performance evaluation apparatus of this invention is for evaluating efficiently and correctly the filtration performance of the filtration element for attaching and filtering to the filtration apparatus provided in the high temperature water system. The filtration element is a member that is attached to a high-temperature water filtration device such as a condensate treatment system and is used for filtering water to be treated such as condensate. The filtration element to be evaluated here is preferably a filtration element to be used by being mounted on an actual condensate treatment system filtration device, but may be a downsized test filtration element. There are various types of elements, such as leaf type, cylinder type, pipe type, filter media such as membranes, fibers, short fibers, powders, etc., and filtration methods such as fixed type and precoat type.

  The filtration performance evaluated by the filtration performance evaluation apparatus of the present invention includes 1) solid matter removal rate, 2) capture capacity per unit filtration area, 3) correlation between filtration flow rate and differential pressure, and 4) other filtration characteristics. Can be given.

  The high-temperature filtration performance evaluation device of the present invention is a device for evaluating the filtration performance of a filtration element attached to a filtration device provided in a high-temperature water system, and is a high-temperature test water channel branched from the high-temperature water system and a high-temperature test water channel. A low-temperature test water channel that branches through a cooling device, a high-temperature test device provided in the high-temperature test water channel, and a second filtration element so as to filter the high-temperature water by attaching the first filtration element. A low temperature test device installed in the low temperature test water channel so as to be mounted and filtered for low temperature water, a first sampling channel communicating between the first cooling device and the low temperature test device in the low temperature test water channel, and a high temperature test A second sampling path that communicates with the downstream side of the high-temperature testing device in the water channel via the second cooling device and a third sampling channel that communicates with the downstream side of the low-temperature testing device in the low-temperature testing water channel are provided.

The high temperature test apparatus provided in the high temperature test water channel is configured to attach the first filtration element to perform filtration of the high temperature water, and to evaluate the filtration performance of the first filtration element in the high temperature water. Moreover, the low-temperature test apparatus provided in the low-temperature test water channel is configured to attach the second filtration element, filter the low-temperature water, and evaluate the filtration performance of the second filtration element in the low-temperature water. The temperature of the test water in the low-temperature test channel is 10 to 50 ° C., preferably normal temperature (20 to 40 ° C.), and the pressure is normal pressure, preferably a pressure (about 0.1 Pa) that allows filtration at normal temperature.

  In the evaluation method of the present invention, a high-temperature test water is diverted from a boiler water pipe into which a filtration device to be evaluated such as a boiler feed water pipe is inserted using a metal pipe (for example, stainless steel). By introducing it into the filtration element to be evaluated without changing the pressure and temperature applied to the test water, and by measuring and comparing the change in water quality, it is possible to sample the test water before and after passing through the filtration element, In addition to making it possible to evaluate the performance of the filtration element in almost the same state as when it was installed in the actual machine, the high-temperature test water introduced at this time was cooled and passed through the filtration element provided at a low temperature, for example, room temperature It is possible to directly compare the filtration characteristics of the filtration element.

  In this case, the high-temperature test apparatus and the low-temperature test apparatus are each provided with a control device configured to conduct a test by applying a load so as to apply the same differential pressure. In addition, by passing water under a load so as to apply the same differential pressure, the high temperature test and the low temperature test can be performed in parallel under substantially the same conditions, and direct comparison becomes possible. In addition, by installing a heating device in front of the high-temperature test channel in the high-temperature test channel, and testing by changing the temperature and pressure of the high-temperature test channel by the heating, the test corresponding to the change in the operating status in the actual high-temperature water system Can do. The same applies to the case where the test is performed by changing the flow rate or other conditions by controlling the valve of the high-temperature test channel.

  The filtration performance of the filtration element is usually presented as a catalog value by a manufacturer, but the filtration performance is usually a test of specific water under normal conditions, and cannot be applied to filtration in a high-temperature water system as it is. For this reason, when judging the availability of such a filtration element, it is necessary to consider the condition fluctuation of (A) water quality and (B) temperature and pressure. In this case, in order to understand whether the problem in filtration performance has occurred due to the factor (A) or whether the problem has occurred due to the factor (B), the two systems of the high temperature test device and the low temperature test device are used. It is necessary to establish and separate items. In this case, the influence of the water quality of (A) is evaluated by the low temperature test apparatus, and the influence of the temperature pressure of (B) is evaluated by the high temperature test apparatus. And in order to evaluate the versatility rather than a single evaluation of whether the filtration performance is good or bad, by accumulating the test results divided into items, even when the above (A), (B) fluctuate, Filtration performance can be estimated, and selection of filtration elements becomes easy.

  In general, the filtration performance of the filtration element varies depending on the amount of the object to be filtered, the flow rate, etc., and is also affected by the properties of the raw water to be filtered. Of these, it is possible to investigate the effects of trapped amount and flow velocity by tests at room temperature, but the state of substances in raw water at high temperatures (high pressure) is often unknown, It was necessary to observe changes in filtration characteristics such as differential pressure increase with water flow when used in actual equipment. However, since the change in the usage state in the actual machine is also affected by the flow velocity and the trapped amount at the same time, it is not possible to evaluate only the influence of the water quality under high temperature (high pressure). In this equipment, in order to clarify the influence of water quality change under high temperature (high pressure) on the filtration element, filtration under high temperature (high pressure) and filtration under normal temperature and normal pressure are performed simultaneously using the same raw water. Thus, it is possible to take out the influence on the filter element due to the water quality under high temperature (high pressure) from the difference. If this apparatus is used, it will become possible to accurately predict changes in filtration performance when filtration conditions such as flow rate are changed.

  For example, when an evaluation is carried out with this device using a filtration element whose usage period has already exceeded a predetermined 80%, the rate of increase after a predetermined differential pressure is indicated by the manufacturer at room temperature and constant water temperature. Although it can be predicted based on the data, the influence of the water quality change due to the difference in water quality and being in a high temperature (high pressure) environment may change the filtration performance or increase the differential pressure increase rate. If this device is used, the effect of being placed under high temperature (high pressure) is compared by comparing the rise rate due to differences in water quality and the difference in rise rate due to being placed under high temperature (high pressure) in addition to the above. It becomes possible to know from the difference between the two, and it is possible to predict how the differential pressure will increase when the filter element whose life is close is used.

  For this reason, in the filtration method of the present invention, the first filtration element is attached to the high-temperature test device, high-temperature water is filtered, the filtration performance in the high-temperature water is evaluated, and the second filtration element is attached to the low-temperature test device. Filter the low-temperature water, evaluate the filtration performance in the low-temperature water, predict the filtration performance in the high-temperature water system from the evaluation results in the high-temperature water and the evaluation results in the low-temperature water, select the filtration element to be used in the high-temperature water system, The selected filtration element is attached to a filtration device provided in a high-temperature water system, and high-temperature water is filtered. Thereby, the filtration performance of the filtration element can be evaluated quickly and accurately, and high-temperature water can be efficiently filtered.

  As described above, the filtration performance evaluation apparatus of the present invention is equipped with the high temperature test water channel branched from the high temperature water system, the low temperature test water channel branched from the high temperature test water channel via the first cooling device, and the first filtration element. A high-temperature test device provided in the high-temperature test water channel so as to filter high-temperature water, and a low-temperature test device provided in the low-temperature test water channel so as to filter the low-temperature water by installing the second filtration element; A first sampling path communicating between the first cooling device of the low temperature test channel and the low temperature test device, and a second sampling connected via a second cooling device downstream of the high temperature test device of the high temperature test channel The filter element to be used has a filtration performance that can be used for the filtration of high-temperature water. How The efficient and can be accurately evaluated, such an effect can be efficiently performed filtered through a filter element that is selected thereby.

It is a flowchart which shows the high temperature water filtration method and filtration performance evaluation apparatus of embodiment.

  In FIG. 1, 1 is a condensate treatment apparatus, which includes a filtration device 2 and a desalination device 3, and is provided in a high-temperature water system (condensate system) L1 that sends condensate from a condenser 4 of a power plant to a boiler 5. ing. The filtration device 2 has a filtration element 6 mounted on a liquid collection board 8 in a container 7, and high-temperature water (condensate) that is treated water supplied into the container 7 from a high-temperature water system (condensate system) L 1. The filter element 6 is configured to be filtered. The filtration device 2 is provided with a backwash device for recovering the reduced filtration capacity, but the illustration is omitted.

10 is a filtration performance evaluation device, and includes a high temperature test water channel L2 branched from the high temperature water system L1, a low temperature test water channel L3 branched from the high temperature test water channel L2 via the first cooling device C1, and a first filtration element 6a. The high temperature test apparatus 11 provided in the high temperature test water channel L2 and the second filtration element 6b are installed so as to filter the high temperature water so that the low temperature water can be filtered. On the downstream side of the provided low temperature test apparatus 12, the first sampling path S1 communicating between the first cooling apparatus C1 and the low temperature test apparatus 12 in the low temperature test water path L3, and the high temperature test apparatus 11 in the high temperature test water path L2. A second sampling path S2 that communicates via the second cooling device C2 and a third sampling path S3 that communicates with the low temperature test water path L3 downstream of the low temperature test apparatus 12 are provided. A heating device 13 is provided upstream of the high temperature test device 11 in the high temperature test water channel L2.

  The first, second, and third sampling paths S1, S2, and S3 are provided with membrane filters M1 to M3 that capture SS particles and measure their particle sizes. V1 to V8 are valves, CV1 to CV3 are constant pressure valves, T1 to T3 are thermometers, P1 to P5 are pressure gauges, F1 and F2 are flow meters, and these opening signals, temperature signals, pressure signals, flow signals Are input to the control device 14 from the input signal line In, and the opening degree of the valve and the like are controlled by a control signal output from the output signal line Out. A heat insulating material 9 is attached outside the high temperature water system L1 and the high temperature test water channel L2 (stainless steel in the embodiment) and the high temperature test apparatus 11 to prevent the temperature from decreasing due to heat dissipation when the sampling water permeates. Have been to.

  In the filtration performance evaluation apparatus 10 described above, the first filtration element 6a is attached to the high temperature test apparatus 11 provided in the high temperature test water channel L2 branched from the high temperature water system L1, and the filtration performance of the high temperature water is evaluated. The second filtration element 6b is attached to the low temperature test device 12 provided in the low temperature test water channel L3 branched from the downstream side of the cooling device C1, and the filtration performance of the low temperature water is evaluated. A filtration element 6 to be used in the high-temperature water system L1 is selected by predicting the filtration performance. And the selected filtration element 6 is attached to the filtration apparatus 2 provided in the high temperature water system L1, and the high temperature water system L1 is filtered.

  The evaluation by the filtration performance evaluation apparatus 10 is performed as follows. First, by opening the valve V1, the high-temperature test water is introduced from the high-temperature water system L1 through the high-temperature test water channel L2 into the high-temperature test apparatus 11 and filtered by the first filtration element 6a for evaluation, and then passes through the flow meter F1. It returns to the feed water treatment system (not shown) of the boiler 5 through the valve V4. Thus, in the high temperature test apparatus 11 provided in the high temperature test water channel L2, the filtration performance in the high temperature water of the 1st filtration element 6a is evaluated by filtering with the 1st filtration element 6a.

  Further, by opening the valve V2, the high temperature test water is introduced from the high temperature test water channel L2 to the first cooling device C1, and is lowered to a low temperature (for example, 30 ° C.) as the test temperature and pressure, and then the low temperature of the low temperature test water channel L3. After being introduced into the test device 12 and filtered by the second filter element 6b for evaluation, the fluid passes through the flow meter F2 and is discharged through the valve V7. Thus, in the low temperature test apparatus 12 provided in the low temperature test water channel L3, the filtration performance in the low temperature water of the 2nd filtration element 6b is evaluated by filtering with the 2nd filtration element 6b.

  In this case, the opening signals of the valves V1 to V8 and the constant pressure valves CV1 to CV3, the temperature signals of the thermometers T1 to T3, the pressure signals of the pressure gauges P1 to P5, the flow signals of the flow meters F1 and F2, etc. To the control device 14. Then, in the control device 14, the high temperature test device 11 and the low temperature test device 12 are set so as to pass the water under the same differential pressure, and control signals output from the output signal line Out are valves V1 to V8, A test is performed by inputting to the constant pressure valves CV1 to CV3 and opening the valve. The same applies when the test is performed by changing the flow rate (flow velocity) of the high temperature test apparatus 11 and the low temperature test apparatus 12. When the temperature of the high-temperature test water in the high-temperature test water channel L2 is increased and the test of the high-temperature test device 11 is performed at a higher temperature, the heating device 13 is operated by a control signal output from the output signal line Out.

  In order to measure the concentration of the component (for example, iron particles) in the sample water supplied to the high temperature test device 11 and the low temperature test device 12, when the valve V5 is opened, the sample water cooled by the first cooling device C1 is It enters the sampling path S1, passes through the membrane filter M1, passes through the constant pressure valve CV1, and is sampled as a feed water sample. Precipitated iron particles and the like are captured by a membrane filter M1 arranged in series so that the size of particles that can be captured becomes smaller in order, and particles or ionic substances smaller than the pore size of the membrane filter M1 are captured by the membrane filter M1. And is sampled from the sampling path S1.

  Further, the liquid filtered by the first filtration element 6a for evaluation attached to the high-temperature test apparatus 11 passes through the second cooling apparatus C2 by opening the valve V6, and has a temperature as low as the low-temperature test water channel L3. The sample is cooled, enters the sampling path S2, passes through the membrane filter M2, and captures particles such as iron particles as in the case of the membrane filter M1, and is sampled from the sampling path S2 through the constant pressure valve CV2.

  Similarly, the liquid filtered by the second filter element 6b for evaluation mounted on the low temperature test apparatus 12 enters the sampling path S3 by opening the valve V8, passes through the membrane filter M3, and the membrane filter M1. Similarly, particles such as iron particles are captured and sampled from the sampling path S3 through the constant pressure valve CV3.

  When evaluating the filtration performance of the first filtration element 6a, the first filtration element 6a to be evaluated is attached to the high temperature test apparatus 11, and the valves V1, V2, V4, V5, V6 and the constant pressure valves CV1, CV2 are installed. The high-temperature water is filtered by adjusting the display value of the flow meter F1 so as to give a predetermined treatment flow rate. When evaluating the filtration performance of the second filtration element 6b, the second filtration element 6b to be evaluated is attached to the low temperature test apparatus 12, and the valves V1, V2, V3, V5, V7, V8 and the constant pressure valve CV1, CV3 is adjusted and adjusted according to the display value of flow meter F2 so as to give a predetermined treatment flow rate, and low-temperature water is filtered.

When evaluating the iron particle trapping performance of the first filtration element 6a in the high-temperature test apparatus 11, the amounts of iron trapped in the membrane filters M1 and M2 are set to f1 and f2, respectively, and each sample of the feed water sample and the treated water sample When the amounts are s1 and s2 and the respective soluble iron concentrations are d1 and d2, the iron concentration Fe1 supplied from the inlet side of the filter and the iron concentration Fe2 of the outlet water of the filter are expressed by Equations 1 and 2, respectively. Desired.
Fe1 = f1 / s1 + d1 [Formula 1]
Fe2 = f2 / s2 + d2 [Formula 2]

At this time, when the amount of water passed through the first filtration element 6a for evaluation in the high-temperature test apparatus 11 is Q1,
Inflow iron amount = (f1 / s1 + d1) × Q1 (Equation 3)
Permeated iron amount = (f2 / s2 + d2) × Q1 (Formula 4)
Captured iron amount = (f1 / s1-f2 / s2 + d1-d2) × Q1
... [Formula 5]
Iron capture rate (%) = (f1 / s1-f2 / s2 + d1-d2) / (f1 / s1 + d1) (Equation 6)
As a result, the iron capture performance of the filtration element 6a can be expressed quantitatively. However, s1, s2 << Q1.

When evaluating the iron particle trapping performance of the second filtration element 6b in the low-temperature test apparatus 12, the amount of iron trapped by the membrane filter M3 in the sampling path S3 is set to f3, the sample amount of treated water is set to s3, and the dissolution thereof When the ferrous iron concentration is d3 and the amount of water passed through the second filtration element 6b is Q2,
Captured iron amount = (f1 / s1-f3 / s3 + d1-d3) × Q2 (Equation 7)
Iron capture rate (%) = (f1 / s1-f3 / s3 + d1-d3) / (f1 / s1 + d1) (Equation 8)

For this reason, if the same thing as the 1st filtration element 6a is equipped as the 2nd filtration element 6b and a water flow test under low temperature is carried out, the treatment performance under the high temperature of the 1st filtration element 6a, It is possible to directly compare the processing performance at low temperatures, and to quantitatively evaluate the change in iron removal performance due to temperature and pressure. In this case, by adjusting so that s2 = s3, it is possible to directly compare the amount of iron trapped in the filtration element at high temperature and low temperature.
This evaluation is also possible by directly comparing the amount of iron captured by the first filtration element 6a attached to the high temperature test apparatus 11 and the second filtration element 6b attached to the low temperature test apparatus 12. It is.

It is assumed that the change over time of the filtration characteristics under normal temperature and normal pressure of the filter element in a specific water quality is presented by the filter manufacturer as follows.
[Temperature characteristics under normal temperature and normal pressure in water quality q0 of filtration element] = F ₀₀ [T]
And the time-dependent change of the filtration characteristic in the water quality q1 under normal temperature and normal pressure is [the time-dependent characteristic in the water quality q1 of the filtration element under the normal temperature and normal pressure] = F ₀₁ [T]
And the change under high temperature (high pressure) is [the time-dependent characteristics of the water quality q1 of the filtration element under high temperature (high pressure)] = F ₁₁ [T]
Assuming that
Also, when the difference between the raw water quality at the time of the flow rate, temperature, and constant pressure to the influence of the filtration element and f _00,
f ₀₀ = F ₀₁ [T] / F ₀₀ [T]
Can know as.

On the other hand, since F ₁₁ [T] is considered to be given by changing the relationship between the water quality and the filtration element at high temperature (high pressure), if f ₁₀ and f ₀₁ are respectively set,
F ₁₁ [T] / F ₀₁ [T] = f ₁₀ + f ₀₁
Can know as.

If it is assumed that the heat resistance of the material used for the filter element is good and that the change in the material of the filter element itself due to high temperature (high pressure) is slight,
F ₁₁ [T] / F ₀₁ [T] ≈f ₁₀
Therefore, the influence of the change in water quality on the filtration element under high temperature (high pressure) is F ₁₁ [T] = f ₁₀ × {f ₀₀ × F ₀₀ [T]}

Here, f ₀₀ and f ₁₀ are characteristics given by this test apparatus, and F ₀₀ [T] is information obtained from the manufacturer and past knowledge of the filtration element, so it was placed under high temperature (high pressure). It is possible to determine the influence F ₁₁ [T] over time of the change in the raw water quality on the filtration element from the respective characteristics.

  As described above, if this device is used, the difference between the rising speed due to the difference in water quality and the rising speed due to being placed under high temperature (high pressure) in addition to the above will be compared under high temperature (high pressure). It is possible to know the effect of the difference from the two differences, and it is possible to predict how the differential pressure will increase when a filter element with a near life is used.

  The present invention relates to a filtration performance evaluation apparatus for evaluating the filtration performance of a filtration element used for filtration of high-temperature water, and a filtration method using the evaluated filtration element, in particular, a thermal power or a condensate treatment system for a nuclear power plant, etc. It can utilize for the filtration performance evaluation apparatus and the filtration method for evaluating the filtration performance of the filtration element used for filtration of high temperature water.

1: Condensate treatment device, 2: Filtration device, 3: Desalination device, 4: Condenser, 5: Boiler, 6: Filtration element, 6a: First filtration element, 6b: Second filtration element, 7: Container , 8: Liquid collection board, 9: Thermal insulation material, 10: Filtration performance evaluation device, 11:
High temperature test device, 12: Low temperature test device, 13: Heating device, 14: Control device,
L1: High temperature water system (condensate system), L2: High temperature test channel, L3: Low temperature test channel, C1:
1st cooling device, C2: 2nd cooling device, S1: 1st sampling path, S2: 2nd sampling path, S3: 3rd sampling path, M1-M3: Membrane filter, V1-V8: Valve , CV1 to CV3: constant pressure valve, T1 to T3: thermometer, P1 to P5: pressure gauge, F1, F2: flow meter.

Claims (6)

A device for evaluating the filtration performance of a filtration element attached to a filtration device provided in a high-temperature water system,
A high-temperature test channel branched from the high-temperature water system;
A low-temperature test channel branched from the high-temperature test channel through the first cooling device;
A high-temperature test apparatus provided in the high-temperature test water channel so as to filter the high-temperature water by attaching the first filtration element;
A low-temperature test device provided in the low-temperature test water channel so as to filter the low-temperature water by attaching the second filtration element;
A first sampling channel communicating between the first cooling device of the low temperature test channel and the low temperature test device;
A second sampling path that communicates with the downstream side of the high temperature test device in the high temperature test water channel via a second cooling device;
A filtration performance evaluation apparatus, comprising: a third sampling path connected to the downstream side of the low temperature test apparatus of the low temperature test water channel.   The apparatus according to claim 1, further comprising a control device configured to perform a test by applying a load so as to apply the same differential pressure to the high temperature test device and the low temperature test device.   The apparatus according to claim 1 or 2, further comprising a heating device in front of the high temperature test device in the high temperature test channel.   The apparatus according to any one of claims 1 to 3, further comprising a membrane filter that captures SS particles and measures a particle size thereof in the first to third sampling paths.   The apparatus according to any one of claims 1 to 4, wherein a heat insulating material is attached to the outside of the pipe constituting the high temperature test water channel branched from the high temperature water system. Using the filtration performance evaluation device according to any one of claims 1 to 5,
The first filtration element is attached to the high-temperature test device provided in the high-temperature test channel that branches from the high-temperature water system, the high-temperature water is filtered, and the filtration performance in the high-temperature water is evaluated.
A low temperature test device provided in a low temperature test channel that branches from the high temperature test channel through the first cooling device is equipped with a second filtration element to filter the low temperature water, and the filtration performance in the low temperature water is evaluated.
From the evaluation results in high-temperature water and the evaluation results in low-temperature water, predict the filtration performance in the high-temperature water system, select the filtration element to be used in the high-temperature water system,
A high-temperature water filtration method comprising: filtering a high-temperature water by attaching the selected filtration element to a filtration device provided in the high-temperature water system.

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