WO2013084641A1 - 付着物検出用のセンサー及び付着物検出装置 - Google Patents

付着物検出用のセンサー及び付着物検出装置 Download PDF

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Publication number
WO2013084641A1
WO2013084641A1 PCT/JP2012/078682 JP2012078682W WO2013084641A1 WO 2013084641 A1 WO2013084641 A1 WO 2013084641A1 JP 2012078682 W JP2012078682 W JP 2012078682W WO 2013084641 A1 WO2013084641 A1 WO 2013084641A1
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Prior art keywords
scale
metal tube
sensor
detection
temperature
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PCT/JP2012/078682
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English (en)
French (fr)
Japanese (ja)
Inventor
由子 岸
信太郎 森
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栗田工業株式会社
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Publication of WO2013084641A1 publication Critical patent/WO2013084641A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/008—Monitoring fouling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity

Definitions

  • the present invention relates to a sensor for detecting deposits and an apparatus for detecting deposits, which are used in an industrial water system such as a cooling water system, or a scale or the like used in a paper pulp manufacturing process. .
  • Such a scale, slime, or a device capable of continuously detecting the occurrence of scale and slime includes, for example, a deposit detection apparatus described in Patent Document 1.
  • This adhering matter detection apparatus has a sensor and a measurement unit.
  • the outer surface of a metal tube in which a heating element and a temperature measuring element are inserted and filled with a heat conductive filler so as to surround them is used as a detection surface for adhering substances in water.
  • This sensor generates a certain amount of heat in the heating element when energized, and measures the temperature in the metal tube heated by the heating element with the temperature measuring element, and detects the difference in the measured temperature to the measuring unit.
  • the adhesion detection of the deposit on the surface is performed.
  • the present invention detects an adhering substance that does not cause a time lag in detecting an adhering substance when detecting an adhering substance adhering to a detection surface due to a change in temperature in a metal tube caused by energization of a heating element. It is an object of the present invention to provide a sensor for use and an attached matter detection apparatus including the sensor.
  • the outer surface is formed as an uneven surface having a predetermined surface roughness, and the outer surface is in contact with the survey water for deposits, and the deposit due to the survey water is attached.
  • a heating element that changes the temperature in the metal tube due to the attachment of the deposit on the detection surface and the metal tube are inserted so as to be surrounded by the filler, and the temperature in the metal tube is measured.
  • it has a temperature measuring body that performs adhesion detection of the deposit based on the measured temperature difference.
  • the heating element is energized to cause the heating element to generate heat with a certain amount of heat, and this amount of heat is detected on the detection surface. Release almost uniformly outward.
  • the temperature measuring device measures, for example, the inner surface temperature T 0 of the metal tube, thereby measuring the temperature increase due to the water temperature + the heat transfer boundary film of the water + the temperature increase due to the heat conduction of the metal tube. Further, the temperature measuring element measures the inner surface temperature T p of the metal tube after a predetermined time has elapsed from the measurement of the temperature T 0 .
  • the detection surface is a smooth outer surface of the metal tube, it is difficult for the adhering matter to adhere, so after adhering partially to the detection surface, it adheres in a form that spreads throughout.
  • the thermal conductivity of the deposit is smaller than that of the metal tube, the heat from the heating element is added at the beginning of the deposit, that is, in the state where the deposit is partially formed on the detection surface. Much is released from the outer surface side of the metal tube without kimono. For this reason, the temperature measuring element cannot fully measure the temperature rise due to the deposit.
  • the detection surface is formed of an uneven surface having a predetermined surface roughness
  • the flow resistance of water around the detection surface can be increased as compared with the case where the detection surface is a smooth metal tube outer surface.
  • the flow rate of water around the detection surface can be reduced, and the adhesive layer of water near the detection surface can be thickened. That is, in this invention, the adhering substance in the water stays on the detection surface and easily adheres to it, and the adhering substance can be easily attached to the entire detection surface.
  • a metal tube, a thermally conductive filler filled in the metal tube, and an outer surface of the metal tube are covered with a scale.
  • a scale covering portion that serves as a detection surface for adhering deposits from the investigation water, and is inserted in the metal tube so as to be surrounded by the filler, and generates a certain amount of heat in the metal tube by energization.
  • a heating element that changes the temperature in the metal tube by the adhesion of the deposit on the detection surface and the metal tube are inserted so as to be surrounded by the filler, and the temperature in the detection tube is measured.
  • it has a temperature measuring body that performs adhesion detection of the deposit based on the measured temperature difference.
  • the detection surface is formed by the surface of the scale in which irregularities are generated by the scale particles, the flow resistance of water around the detection surface is increased compared to the case where this is the outer surface of a smooth metal tube. It is possible to create a state where adhering substances in the water stay and easily adhere to the detection surface. For this reason, the deposits easily adhere to the entire detection surface from the beginning of deposition. Further, in the present invention, since the surface of the scale is used as the detection surface, the scale material in water can be easily attached to the surface of the scale that is energetically stable compared to the outer surface of the metal tube, that is, the detection surface. . For this reason, in this invention, a scale can be made to adhere to a detection surface at an early stage.
  • the components of the scale are calcium carbonate, basic zinc carbonate, calcium sulfate, calcium sulfite, barium sulfate, aluminum sulfate, calcium phosphate, zinc phosphate, silica That is, any one of calcium acid, magnesium silicate, calcium oxalate, magnesium hydroxide, and zinc hydroxide, or a mixture of at least two of these.
  • a heating element and a temperature measuring element are inserted, and the outer surface of a metal tube filled with a heat-conducting filler is surrounded by a scale so as to surround them.
  • the sensor is used as a detection surface that comes into contact with the survey water for deposits and deposits the deposits from the survey water, and the amount of current supplied to the heating element of the sensor is controlled, so that a certain amount of heat is applied to the heating element.
  • the energization amount control means sets the current value to a predetermined value in the first time zone, but the current value in the second time zone following this. Setting the value to zero or a value close to zero means controlling the energization amount of the sensor to the heating element so as to continuously repeat.
  • the temperature measuring element can measure the temperature of the survey water.
  • the detection surface is formed of an uneven surface having a predetermined surface roughness, deposits such as scale, slime, or scale and slime adhere to the entire detection surface. Therefore, it is possible to detect the adherence of the adhering substance without a time lag from the adhering substance adhering to the actual machine.
  • the detection surface is formed by the surface of the scale in which irregularities are generated by the scale particles, the scale, slime, or The deposits such as the scale and the slime are likely to be adhered, and the adhesion detection of the deposits can be performed or performed without a time lag from the adhesion of the deposits in the actual machine.
  • the surface of the scale is the detection surface, the scale material in the survey water is more likely to adhere to the detection surface than in the case of the actual device, and before the scale adheres to the actual device, The adhesion detection can be performed or can be performed.
  • the temperature of the deposit water can be measured with a temperature measuring body, so the configuration of the deposit detection device is simplified, and the detection of the deposit can be easily performed correspondingly. .
  • FIG. 1 is a sectional view of the sensor.
  • FIG. 2 is an explanatory view in the case of forming a scale covering portion on the outer surface of the metal tube of the sensor.
  • FIG. 3 is a graph showing a state in which the scale deposition rate changes with time when the scale generation water generates scale.
  • FIG. 4 is a diagram illustrating a state in which the generation of scale due to the survey water is detected using a sensor.
  • FIG. 5 is a graph showing a change in the current value of the heating current supplied to the sensor and a change in the temperature in the detection unit corresponding to the heating current.
  • FIGS. 6A and 6B are diagrams for explaining the temperature around the cross section of the detection unit.
  • FIG. 6A shows a state before the scale is attached
  • FIG. 6B shows a state after the scale is attached.
  • FIG. 7 is a graph showing a change in the temperature rise in the detection unit due to the generation of the scale.
  • FIG. 8 is a diagram showing a state in which generation of scale due to cooling water is detected using a sensor in the cooling tower.
  • FIG. 1 shows a sensor for detecting a deposit according to an embodiment of the present invention.
  • the sensor 1 includes a metal tube 10 whose one end is closed, a heating element 11 and a temperature measuring body 12 inserted into the metal tube 10, and a heating element 11 and a temperature measuring body 12. It is integrated with the metal tube 10 so as to close the filler 13 filled in the metal tube 10 and the open end 10a side of the metal tube 10 so as to be a support portion of the metal tube 10 Further, the entire outer surface of the resin portion 14 formed sufficiently larger in diameter than the metal tube 10 and the protruding portion 10b of the metal tube 10 protruding from the resin portion 14 is made of a scale made of a predetermined scale component (hereinafter referred to as a coating scale G). ) And the scale covering portion 15 covered with.
  • a coating scale G a predetermined scale component
  • the adhering matter detection unit K includes a protruding portion 10 b of the metal tube 10, a heating element 11, a temperature measuring body 12, a filler 13, and a scale covering portion 15 in the protruding portion 10 b.
  • This sensor 1 has a detection unit K immersed in water (hereinafter referred to as survey water W0) for investigating the occurrence of deposits (for the sake of clarity, the deposits are hereinafter referred to as scales). Whether or not the scale is attached to the outer surface of K (hereinafter referred to as detection surface K1) is detected. That is, the sensor 1 measures the temperature in the detection unit K heated by the heating element 11 with the temperature measuring element 12 while generating a certain amount of heat in the heating element 11, and based on the measured temperature difference. Thus, the detection control unit 2 (described later) detects the adhesion of the scale to the detection surface K1.
  • the one end side of the metal tube 10 is closed into a hemispherical shape, and the outer surface is made smooth by a corrosion-resistant metal such as brass or stainless steel.
  • a corrosion-resistant metal such as brass or stainless steel.
  • the size of the metal tube 10 for example, the diameter D is 3 mm, the wall thickness is 0.1 mm, and the length L of the protruding portion 10 b is 18 mm.
  • the heating element 11 generates heat when energized, and gives a predetermined amount of heat flux to the entire detection unit K.
  • a platinum thin film formed on an insulating substrate is used as the heating element 11. Specifically, a metal having a diameter of 1.7 mm and a length of 4.0 mm and a resistance value of 120 ⁇ is used. Film resistance is used.
  • the heating element 11 is positioned at the center position of the metal tube 10 so that the center line overlaps the center axis of the metal tube 10, and generates a substantially uniform heat flux toward the detection surface K1 side.
  • the heating element 11 is connected to the three lead wires 11 a, 11 b, 11 c through the metal tube 10, and is supplied with the heating current I through the lead wires 11 a, 11 b, 11 c and the metal tube 10.
  • the temperature measuring element 12 measures the internal temperature of the detection unit K, preferably the inner surface temperature of the metal tube 10.
  • a thermocouple is used for the temperature measuring element 12.
  • the temperature measuring body 12 is positioned so as to contact the inner surface of the metal tube 10.
  • the temperature measuring body 12 is connected to two lead wires 12a and 12b and transmits a temperature signal S to the outside.
  • the filler 13 is used to make the temperature inside the metal tube 10 substantially uniform.
  • the filler 13 for example, magnesium oxide (magnesia) powder having thermal conductivity and electrical insulation and having an average particle diameter of 100 ⁇ m is used.
  • the resin part 14 is formed from the epoxy resin which has heat insulation and electrical insulation.
  • the scale coating portion 15 is preferably formed of a coating scale G made of the same scale component as the scale component of the scale to be detected (hereinafter referred to as adhesion scale F).
  • adhesion scale F the same calcium carbonate as the scale component of the adhesion scale F is used as the scale component of the coating scale G.
  • the coating scale G is, for example, calcium carbonate, basic zinc carbonate, calcium sulfate, calcium sulfite, barium sulfate, aluminum sulfate, calcium phosphate, zinc phosphate, calcium silicate, magnesium silicate, calcium oxalate, hydroxide It is formed from a scale component obtained by mixing either magnesium or zinc hydroxide, or at least two of these.
  • the scale component of the coating scale G is as close as possible to the scale component of the adhesion scale F generated by the water used in the actual machine. The reason is that the adhesion of the scale becomes easy and the adhesion of the scale can be detected earlier.
  • these scale components are the same type.
  • Examples of the same type of scale component include carbonates such as calcium carbonate and basic zinc carbonate, sulfates such as calcium sulfate, calcium sulfite, barium sulfate and aluminum sulfate, and phosphates such as calcium phosphate and zinc phosphate.
  • Silicates such as calcium silicate and magnesium silicate, oxalates such as calcium oxalate, and hydroxides such as magnesium hydroxide and zinc hydroxide.
  • the scale component of the adhesion scale F is carbonate scale component, sulfate scale component, phosphate scale component, silicate scale component, oxalate scale component, hydroxylation
  • the coating scale G is used as the main scale component of the adhesion scale F, for example. It may be formed from those containing two or three scale components. Even in this case, the scale component of the coating scale G can be said to be the same type as the scale component of the adhesion scale F.
  • FIG. 2 shows a scale forming facility A for forming the scale covering portion 15 on the outer surface of the protruding portion 10 b of the metal tube 10.
  • the scale forming facility A is filled with a scale-generating water W1 that generates a scale and is closed with a cylindrical container 100 having a capacity of 1 L (liter) with the lower end closed, and the scale-generating water W1.
  • the stirrer 110 that stirs the scale-generated water W1 magnetically using the stirrer 111 and the thermostat 120 that keeps the scale-generated water W1 in the container 100 at a constant temperature (for example, 30 ° C.).
  • a calcium hardness component replenisher 130 for replenishing the hardness component (calcium) into the container 100
  • M alkalinity component replenisher for replenishing the container 100 with the M alkalinity component (bicarbonate) and the maleic acid polymer.
  • the calcium hardness component replenisher 130 includes a pump 131, a pipe 132, and a container 133 filled with a calcium chloride aqueous solution.
  • the M alkalinity component replenisher 140 includes a pump 141, a pipe 142, and a container 143 filled with a solution obtained by adding a maleic acid polymer to an aqueous sodium hydrogen carbonate solution.
  • Scale generation water W1 is distilled water
  • calcium hardness component is 500 mg / L in terms of CaCO 3
  • M alkalinity component is 500 mg / L in terms of CaCO 3
  • maleic acid polymer is only 5 mg / L (solid content concentration). It is dissolved and has sufficient scale material to cause the calcium carbonate component to scale.
  • the maleic acid polymer is a reaction inhibitor that prevents solid calcium carbonate from being generated and precipitated in water before scale generation.
  • the stirrer 110 stirs the scale generation water W1 in the container 100 using the stirrer 111, and makes the concentrations of the calcium hardness component, the M alkalinity component, and the maleic acid polymer in the scale generation water W1 constant. Has a function.
  • the stirrer 110 keeps the flow rate of water around the detection unit K immersed in the scale-generated water W ⁇ b> 1 constant, and the temperature rises by the heat transfer boundary film ( (To be described later).
  • the calcium hardness component replenisher 130 and the M alkalinity component replenisher 140 replenish the calcium hardness component, M alkalinity component, and maleic acid polymer in the scale generation water W1, which are insufficient due to the generation and overflow of the scale.
  • the supply amount of the calcium hardness component and the like by these is so small that the residence time of the calcium hardness component and the like in the container 100 is, for example, 200 minutes.
  • An aqueous solution such as a calcium hardness component overflows from the overflow pipe 150 of the container 100 by substantially the supply amount.
  • FIG. 3 shows how the scale deposition rate (mcm, specifically mg / cm 2 / month) due to the scale-generated water W1 changes with time.
  • the scale adhesion rate is calculated by immersing a test piece made of stainless steel (SUS304) in the scale-generated water W1 in the container 100, taking it out at regular intervals, and measuring the weight.
  • SUS304 stainless steel
  • the scale covering portion 15 immerses the protruding portion 10b of the metal tube 10 serving as the detecting portion K in the scale generated water W1 in the container 100 for 48 hours, for example, and the scale generated water W1 is formed on the outer surface of the protruding portion 10b. Formed by depositing scale material inside.
  • the scale covering portion 15 is formed by covering the entire outer surface of the protruding portion 10b of the metal tube 10 with a covering scale G made of a calcium carbonate component having a substantially equal thickness.
  • FIG. 4 shows a state where the generation of scale due to the scale-generated water W1 in the scale forming facility A is detected by the deposit detection device B provided with the sensor 1.
  • the scale generation water W1 is also referred to as the survey water W0 for investigating the occurrence of the scale for the adhering matter detection device B and the sensor 1, and hence the scale generation water W1 is hereinafter referred to as the survey water W0.
  • the attached matter detection apparatus B includes a sensor 1, a detection control unit 2, and a power source 3.
  • the detection control unit 2 is a computer including a central processing unit (CPU), a memory such as a RAM and a ROM, an input / output interface, and the like, and operates according to a program.
  • the detection control unit 2 includes an energization amount control unit 20 and an attached matter detection unit 21 as functions of a CPU that operates according to a program.
  • the energization amount control means 20 controls the power supply 3 so that the heating current I given to the sensor 1 from the power supply 3 becomes a square wave current as shown in FIG. That is, the energization amount control means 20 sets the current value applied to the heating element 11 of the sensor 1 to a predetermined magnitude I 0 in the first time zone t1, but the second value following the first time zone t1. In the time zone t2, the power supply 3 is controlled so as to continuously repeat zeroing.
  • the energization amount control means 20 also has a function of notifying the adhering matter detection means 21 of the end timings of the first time zone t1 and the second time zone t2.
  • the heating element 11 Heat is generated by a predetermined amount of heat to generate a substantially uniform heat flux from the detection portion K of the sensor 1 toward the detection surface K1.
  • this heat flux is obtained when the scale is not attached to the detection surface K1, and the temperature rise ⁇ T 1 due to the metal tube wall and the covering scale G in the detection unit K.
  • T 0 ⁇ T 1 + ⁇ T 2 + ⁇ T 3 + TW 0
  • T 0 -TW 0 ⁇ T 1 + ⁇ T 2 + ⁇ T 3 (1)
  • the lower graph in FIG. 5 shows the temperature change in the detection unit K when the heating element 11 generates heat and when it does not generate heat. This graph shows that a certain time is required until the temperature measured by the temperature measuring body 12 reaches the temperature of the object to be obtained (for example, the survey water W0).
  • the temperature measuring element 12 is heated by the heat generated by the heating element 11 ( ⁇ T 1 + ⁇ T 2 + ⁇ T 3 ) as shown in FIG. ), A temperature T p obtained by adding the temperature increase ⁇ T 4 due to the adhesion scale and the temperature TW p of the survey water W0 is measured.
  • the temperature rise ( ⁇ T 3 ) due to the heat transfer boundary film of the survey water W 0 becomes a constant value due to the action of the stirrer 110.
  • the heating element 11 does not generate heat
  • temperature sensing element 12 measures the temperature TW p surveys water W0.
  • T p -TW p can be calculated by the above equation (2).
  • the attached matter detection means 21 calculates and detects whether or not a scale is attached to the detection surface K1 of the sensor 1 based on the temperature signal S from the sensor 1.
  • the adhering matter detection means 21 stores the temperature T 0 in the detection unit K and the temperature TW 0 of the survey water W0 at that time when the adhering scale F is not present on the detection surface K1 of the sensor 1.
  • the energization amount control means 20 is, for example, the current magnitude I 0 in the first time zone t1 for 60 seconds in the first time zone t1, 60 seconds in the second time zone t2. Is controlled so as to be 40 mA, and the adhering matter detection means 21 calculates the temperature increase ⁇ T 4 due to the adhering scale F at regular intervals based on the equation (3) or (4).
  • a graph a in FIG. 7 shows a temperature rise in the detection unit K, that is, a temperature rise ⁇ T 4 due to the adhesion scale F.
  • the graph b of FIG. 7 has shown the temperature rise in the same detection part at the time of using the conventional sensor which does not have the scale coating
  • the outer surface of the metal tube is the detection surface
  • the scale is difficult to adhere to the detection surface, and adheres in such a manner that it partially adheres to the detection surface but spreads throughout. To go.
  • the thermal conductivity of the deposit is generally smaller than that of the metal tube forming the detection surface, the heating element is initially attached to the scale, that is, in the state where the scale is partially formed on the detection surface. Much heat is released from the metal surface side without scale. For this reason, at the beginning of the adhesion of the scale, the temperature measuring body cannot sufficiently catch the temperature rise in the detection unit due to the scale.
  • the temperature in the detection portion K starts to rise immediately after the start of temperature measurement, as is apparent from the graph a in FIG. Later, it rises by about 0.2 ° C. This indicates that the scale has started to adhere to the entire detection surface K1 of the sensor 1 immediately after the start of temperature measurement.
  • the detection surface K1 of the deposit is formed by the surface of the covering scale G that is uneven due to the scale particles, so that the detection surface K1 is compared with the case where this is a smooth outer surface of the metal tube.
  • the flow resistance of the surrounding water can be increased.
  • the sensor 1 can reduce the flow rate of water around the detection surface K1 and increase the thickness of the adhesive layer of water near the detection surface K1. That is, the sensor 1 creates a state in which the scale substance in the water stays and adheres to the detection surface K1, and easily attaches the scale to the entire detection surface K1. The same can be said for slime produced by microorganisms or the like in the survey water W0.
  • the senor 1 can attach the deposits such as scale, slime, or scale and slime to the entire surface of the detection surface K1 from the beginning of the deposition, and the detection control unit 2 can deposit the deposits on the actual machine. Adhesion detection can be performed without time and time lag.
  • the scale material in the survey water W0 is energetically stable on the coating scale C compared to the outer surface of the metal tube, that is, the detection surface. Easy to deposit on K1. For this reason, this sensor 1 makes it easier to attach the scale substance in the survey water W0 to the detection surface K1 than in the case of the actual machine, and the scale adheres to the detection control unit 2 before the scale adheres to the actual machine. Detection can be performed.
  • the detection control unit 2 can be scaled more quickly. Adhesion detection can be performed.
  • the adhering matter detection apparatus B provided with the sensor 1 sets the current value to a predetermined magnitude I 0 in the first time zone t1, but sets the current value to zero in the subsequent second time zone t2.
  • the power supply amount control means 20 for controlling the power supply amount to the heating element 11 of the sensor 1 is provided so as to continuously repeat the process. For this reason, this adhering matter detection apparatus B sets the temperature of the survey water W0 by the temperature measuring body 12 of the sensor 1 when the current value to the heating element 11 is zero (during the second time zone t2). It can be measured. Therefore, the adhering matter detection apparatus B can simplify the apparatus, thereby facilitating the detection of the adhering matter.
  • the senor 1 does not have the scale covering portion 15 in the detection portion K, and the outer surface of the protruding portion 10b of the metal tube 10 serving as the detection surface K1 is formed as an uneven surface having a predetermined surface roughness. Also good. Since the sensor 1 can increase the flow resistance of the water around the detection surface K1 compared to the case where the outer surface of the detection unit K is the outer surface of a smooth metal tube, the flow velocity of the water around the detection surface K1 is reduced. In addition, it is possible to create a state in which the adhering substance in the water is retained and easily adheres to the detection surface K1.
  • this sensor 1 can attach the deposits such as scale, slime, or scale and slime to the entire surface of the detection surface K1 from the beginning of the deposition, and the detection control unit 2 can attach the deposits in the actual machine.
  • Adhesion detection can be performed without time lag from the adhesion.
  • the surface roughness of the outer surface of the metal tube 10 is, for example, the same as the surface roughness of the covering scale G, or a cast tube that is considered to have a large surface roughness on the inner surface of a pipe or the like. It may be the same as the inner surface roughness.
  • the scale component of the coating scale G is the same as the scale component of the adhesion scale F, but this may be the same type as the scale component of the adhesion scale F. Since the sensor 1 has a scale component of the covering scale G that is not the same type as the scale component of the adhesion scale F, the scale can be easily adhered to the detection surface K1. Can be detected.
  • the energization amount control means 20 may control the power supply 3 so that there is no time zone (second time zone t2) in which no current flows when the heating element 11 of the sensor 1 is energized.
  • the temperature of the survey water W ⁇ b> 0 may be measured by a temperature measurement unit different from the temperature measuring body 12, and a measurement temperature signal from the temperature measurement unit may be transmitted to the detection control unit 2.
  • the energization amount control means 20 may control the power source 3 so that the current value in the second time zone t2 is not zero but is a small value close to zero.
  • FIG. 8 shows the deposit detection device C installed around the cooling tower 200.
  • the cooling tower 200 sprays the cooling water W ⁇ b> 2 from the water spray nozzle 201 a provided in the upper header 201, and the sprinkled cooling water W ⁇ b> 2 is supplied to the outside air in the filler 202. It cools by making Q and gas-liquid contact, and cools this cooling water W2 temporarily in the tank part 203 of the lower part. Further, the cooling water W2 in the tank unit 203 is sent to the heat exchanger 230 using the pump 210 and the pipe 220, and after cooling and warming the fluid in the heat exchanger 230, the cooling water W2 is cooled by the pipe 220. It circulates back to the header 201 of the tower 200.
  • the adhering matter detection device C includes a sensor 1, a detection control unit 2, a power source 3, a measurement cell 4, a pump 5, an inlet pipe 6 and an outlet pipe 7.
  • the measurement cell 4 has the sensor 1 installed therein, and is connected to the tank unit 203 of the cooling tower 200 using the inlet pipe 6 and the outlet pipe 7.
  • the cooling water W2 in the tank unit 203 of the cooling tower 200 that is, the survey water W0 is sent into the measurement cell 4 by using the inlet pipe 6 and the pump 5, and the detection unit K of the sensor 1 in the measurement cell 4 After contact, it is returned to the cooling tower 200 using the outlet pipe 7.
  • the flow rate of the survey water W0 around the detection unit K in the measurement cell 4 is adjusted so that the temperature increase ⁇ T 3 due to the heat transfer boundary film of the survey water W0 is always constant.
  • the temperature of the survey water W0 is constant from the end of the first time zone t1 to the end of the second time zone t2.
  • the scale coating portion 15 of the sensor 1 is composed of, for example, calcium sulfate. Formed with a coating scale G.
  • the scale covering portion 15 of the sensor 1 has a scale component, For example, it is formed with a coating scale G made of calcium carbonate and calcium phosphate.
  • the deposit detection means 21 of the detection control unit 2 calculates the temperature rise ⁇ T 4 due to the deposit scale F using the equation (3). If this temperature rise ⁇ T 4 is, for example, 0.1 ° C. or more, the sensor It is determined that the scale is attached to the first detection unit K. Note that the temperature rise value (0.1 ° C.), which is a criterion for determining scale adhesion, should be determined in consideration of temperature measurement errors and the like.
  • the adhering matter detection means 21 sets the temperatures T n and TW n at the time of judging that the adhesion scale F is generated as T 0 and TW 0. Then, it is only necessary to detect adhesion of a new scale to the detection surface K1 of the sensor 1.

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PCT/JP2012/078682 2011-12-09 2012-11-06 付着物検出用のセンサー及び付着物検出装置 WO2013084641A1 (ja)

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