WO2017006455A1 - Procédé permettant d'évaluer la propreté d'une conduite de liquide de refroidissement - Google Patents

Procédé permettant d'évaluer la propreté d'une conduite de liquide de refroidissement Download PDF

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Publication number
WO2017006455A1
WO2017006455A1 PCT/JP2015/069622 JP2015069622W WO2017006455A1 WO 2017006455 A1 WO2017006455 A1 WO 2017006455A1 JP 2015069622 W JP2015069622 W JP 2015069622W WO 2017006455 A1 WO2017006455 A1 WO 2017006455A1
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WO
WIPO (PCT)
Prior art keywords
cooling water
contamination
water line
condenser
evaluating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/069622
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English (en)
Japanese (ja)
Inventor
義尚 岸根
元揮 谷垣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurita Water Industries Ltd
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Kurita Water Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Priority to PCT/JP2015/069622 priority Critical patent/WO2017006455A1/fr
Publication of WO2017006455A1 publication Critical patent/WO2017006455A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00

Definitions

  • the present invention relates to a method for evaluating the fouling of a refrigeration system equipped with a compression refrigerator or an absorption refrigerator.
  • the present invention relates to a method for evaluating contamination of a cooling water line when circulating cooling water through a condenser of the refrigerator.
  • water systems including various heat exchangers such as refrigerators are provided, and cooling water and the object to be cooled are brought into contact with each other through the heat exchanger to cool the object to be cooled (in some cases, latent heat is used). Including those that only take away).
  • a refrigerant such as chlorofluorocarbon or water is used as an object to be cooled.
  • various heat exchangers are used, and air, an oily substance, and various organic substances are used as a body to be cooled.
  • condensers those that are accompanied by condensation of the cooled object are referred to as condensers, and those that are not accompanied by condensation of the cooled object are referred to as coolers.
  • a compression type refrigerator with condensation will be mainly described as an example.
  • the present invention is not limited to the compression type refrigerator, and can be applied to general heat exchangers.
  • the cooling water in order to save water, the cooling water is operated with higher concentration and lower flow rate. Under such operating conditions, the ionic component accompanying the evaporation of the cooling water may concentrate, and the scale may precipitate and adhere to the refrigerator. Microorganisms propagate in the cooling water, and slime may adhere to the refrigerator.
  • Heat transfer from the object to be cooled to the cooling water is hindered by the adhesion of dirt such as scale and slime.
  • the amount of the object to be cooled decreases; the pressure increases; the temperature of the object to be cooled increases, the load on the compressor increases, and the high pressure cut (the compressor stops at a certain level or more). ) May occur. Due to adhesion of dirt such as scale and slime, the refrigerating capacity is reduced and the power consumption is increased, so that the energy efficiency is lowered.
  • LTD temperature after cooling of the cooled object ⁇ cooling water outlet temperature
  • ATD temperature after cooling of the cooled object ⁇ cooling water inlet temperature The temperature after cooling of the cooled object is defined as the heat exchanger outlet temperature of the cooled object. Can be measured.
  • Patent Document 2 discloses that the LTD and ATD are corrected, and the corrected LTD value or corrected ATD value is compared with a reference value to obtain a heat exchanger. It is described that the dirt is evaluated.
  • the absolute value is affected by the thermometer mounting position, cooling machine specifications and model, etc.
  • it is necessary to collect and accumulate LTD, ATD, correction LTD, and correction ATD over the long term, and to grasp the dirt index due to the increasing tendency. Therefore, in order to grasp the increasing tendency of dirt, a period of at least about two weeks is required, and the period has been required to be shortened.
  • An object of the present invention is to provide a dirt evaluation method capable of obtaining dirt on a cooling water line of a refrigeration system with high accuracy.
  • the method for evaluating contamination of a cooling water line is a method for evaluating contamination in a refrigeration system including a condenser and an evaporator, wherein the contamination of the cooling water line in which cooling water is circulated through the condenser is evaluated.
  • the LTD of the condenser is measured, and the cooling water is based on the measurement result of the LTD when the load of the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation. Evaluate line contamination.
  • the refrigeration system compresses the medium from the evaporator by the compressor and directs it to the condenser to condense, and introduces the condensed liquid into the evaporator through an expansion valve for evaporation. It is configured.
  • the load of the evaporator or the condenser is a temperature difference between a brine inlet temperature and a brine outlet temperature and a rated brine (sometimes cold water or cooling water) temperature. It is the ratio to the difference.
  • the brine outlet temperature T 2 extracts the LTD in the case where the predetermined temperature or less, to evaluate the contamination of the cooling water line based on the extracted LTD.
  • the LTD when the brine outlet temperature T 2 is equal to or lower than the predetermined temperature and (T 1 ⁇ T 2 ) / (rated brine temperature difference) is equal to or higher than the predetermined value is extracted and extracted.
  • the contamination of the cooling water line is evaluated based on the LTD.
  • the LTD when the difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser is equal to or greater than a certain value is extracted, and based on the extracted LTD Evaluate dirt on the cooling water line.
  • an LTD is extracted when the current value or power value of the compressor is equal to or greater than a predetermined ratio of the rated current value or the rated power value, and the cooling water line is cleaned based on the extracted LTD. evaluate.
  • the pressure of the temperature T 6 or medium medium flowing into the condenser extracts LTD when a predetermined value or more, to evaluate the contamination of the cooling water line based on the extracted LTD .
  • an LTD-time graph is created by continuing plots so that the extracted LTD is continuous in the LTD-time graph, and the contamination of the cooling water line is evaluated from this graph.
  • Cooling water is passed through the cooling water line of the condenser, and this cooling water is cooled by a cooling tower or the like provided in the line. If the contamination of the cooling water line increases, the LTD of the condenser (T 5 -T 4 described later) increases, so that the LTD becomes an index value of the contamination.
  • the refrigerator starts and stops (start / stop)
  • the relation between the LTD and the contamination of the cooling water line is small when the refrigerator is in an unsteady state immediately after the start.
  • the load on the refrigerator is small, the heat exchange is not stable, so the correlation between the LTD and the contamination of the cooling water line is low. Therefore, in the present invention, the contamination state of the cooling water line is evaluated based on data when the load on the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation.
  • the following effects can be obtained. 1) Based on the LTD at the time when the refrigerator is operated and heat exchange is performed stably, the heat exchange efficiency of the refrigerator can be accurately evaluated. 2) Adaptable to different driving loads depending on the season. 3) The trend of LTD can be easily understood. 4) It can be determined whether the change in LTD is due to a change in load or a change in efficiency. 5) When the refrigerant temperature rises, the LTD rises, but the rise in LTD is due to fouling, so the rate of rise is very slow. When the increase in LTD is rapid, it can be determined that only the refrigerant temperature is rising rapidly due to mechanical trouble.
  • FIG. 1 is a flowchart showing an example of a turbo compression refrigeration system.
  • the refrigerator 1 compresses a medium (for example, an HFC (hydrofluorocarbon) system, an HCFC (hydrochlorofluorocarbon) system, or a CFC (chlorofluorocarbon) system) with a turbo compressor 2, and guides it to a condenser 3 for condensation.
  • the cooling water cooled by the cooling tower 6 is circulated through the heat transfer tube (cooling coil) 3 a of the condenser 3 through the pump 7.
  • the difference T 5 -T 4 of the medium outlet temperature T 5 of the condenser 3 and the cooling water outlet temperature T 4 is LTD.
  • the temperatures T 1 to T 6 are measured by a temperature sensor.
  • the condensed liquid is introduced into the evaporator 5 through the expansion valve 4, evaporates and adiabatically expands, and cools the refrigerant (brine in this embodiment) flowing in the heat transfer coil 5a.
  • the steam is sent to the compressor 2 and compressed again.
  • the brine that has been heated by the heat exchanger in the load body 9 and passed through the heat transfer coil 5 a is passed through the pump 8, and the cooled cold brine is circulated through the load body 9.
  • a cooling water line is configured by the heat transfer tube 3a, the cooling tower 6, the pump 7, and the pipes 6A and 6B.
  • This cooling tower 6 has a casing (tower) 6a, an air inlet 6b provided on the side surface of the casing 6a, and a cooling water tank (pit) 6c provided at the bottom.
  • a filler 6d is accommodated in the casing 6a, and a cooling water sprinkling nozzle 6e is disposed above the filler 6d.
  • An opening 6g is provided at the top of the casing 6a, and a blower 6f is provided in the opening 6g.
  • the suction port of the pump 7 is connected to the vicinity of the bottom of the water tank 6c, and the discharge port of the pump 7 is connected to one end of the heat transfer tube (cooling coil) 3a via the cooling water forward piping 6A.
  • the other end of the heat transfer tube 3a is connected to a watering nozzle 6e of the cooling tower 6 via a cooling water return pipe 6B.
  • the water tank 6c is provided with a ball tap as a water level control means to which a water supply pipe for makeup water (ground water, tap water, industrial water, etc.) is connected, and the water level in the water tank 6c is set within a set range. It comes to hold.
  • a water supply pipe for makeup water ground water, tap water, industrial water, etc.
  • Ratio (T 1 -T 2 ) / (rated brine temperature difference) between the difference (T 1 -T 2 ) between the brine inlet temperature T 1 and the brine outlet temperature T 2 of the evaporator 5 and the rated brine temperature difference of the evaporator 5 ) Is the brine load.
  • FIG. 3 shows an example of the LTD of this system.
  • the LTD greatly varies depending on the start / stop of the refrigerator and the load fluctuation. Therefore, in this embodiment, the brine outlet temperature T 2 is below a predetermined temperature, and brine load to extract LTD where is above a predetermined value.
  • This predetermined value is preferably a value selected from 0.5 to 0.7.
  • extraction (filtering) of LTD data may be performed by any of the following methods i) to iv).
  • the difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser 3 is a certain value or more, preferably T 4 -T 3 is the difference between the rated cooling water inlet temperature and the outlet temperature.
  • LTD is extracted when it is N% or more (N% is preferably 60% or more, more preferably 80% or more).
  • T 4 -T 3 is an index value for judging the stability of heat exchange. Generally, the higher the load, the more stable the heat exchange.
  • the brine outlet temperature T 2 is extracted LTD when more than a predetermined value.
  • the brine outlet temperature is an index value for the start / stop of the refrigerator. When the refrigerator is in steady operation, the brine outlet temperature is generally low. iii) Extract the LTD when the current value or power value of the compressor 2 is C% or more of the rated current value or rated power value (C% is preferably 60% or more, more preferably 80% or more). This current value or power value is an index value of the start / stop of the refrigerator, and becomes a predetermined value or more during steady operation. iv) Extract the LTD when the temperature T 6 (or the pressure of the medium) of the medium flowing into the condenser 3 is equal to or higher than a predetermined value. This temperature or pressure is an index value for start / stop, and becomes a predetermined value or more during steady operation.
  • the above description relates to a compression refrigerator, but the present invention can also be applied to an absorption refrigeration system having a regenerator using gas, fuel oil, steam or the like as a heat source.
  • the temperature data of T 1 to T 6 measured by the temperature measuring means 11 is accumulated in the temperature data accumulating means 12, and any of the above extraction methods is used, and the predetermined value is set to any value.
  • the filtering rule is input from the filtering (extraction) rule input unit 16 to the filtering rule storage unit 17. From the accumulated temperature data, the one that meets the extraction condition is extracted by the filtering unit 13, the LTD is calculated by the calculating unit 14, and presented by the presenting unit 15.
  • a commercially available data logger device may be applied, but a method in which collected data is stored in a server via the Internet and data can be confirmed via the Internet may be adopted. By using this method, it is possible to check the situation at the site even at a location away from the site.
  • FIG. 5 shows an LTD-time graph in which plots are continued by cutting data at the time of non-extraction so that the extracted LTD values are continuous. According to FIG. 5, it is possible to clearly know the fluctuation of the LTD value from which the data disturbance due to start / stop is removed.
  • the average value of LTD is 0.6 ° C. in the case of FIG. 3 including data in a stop or control transition period (for example, immediately after startup).
  • the average value of LTD is 2.9 ° C., and it can be seen that FIG. 5 is more suitable for the actual situation.
  • Fig. 6 shows a graph in which data taken at different times in this actual machine was extracted in the same manner and added with brine load data. As shown in FIG. 6, it is clear that LTD changes according to load.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un procédé permettant d'évaluer la propreté d'une conduite de liquide de refroidissement dans un système de réfrigération, selon lequel il est possible de déterminer avec précision la propreté d'une conduite de liquide de refroidissement dans un système de réfrigération. Un système de réfrigération comporte un réfrigérateur d'absorption ayant un réfrigérateur à compression comportant un compresseur (2), un condenseur (3) et un évaporateur (5), la propreté d'une conduite de liquide de refroidissement à travers laquelle un liquide de refroidissement est mis en circulation et réparti dans le condenseur (3), est évaluée. Le LTD du condenseur (3) est mesuré et la propreté de la conduite de liquide de refroidissement est évaluée sur la base des résultats de mesure de LTD lorsque la charge de l'évaporateur (5) ou du condenseur (3) est égale ou supérieure à une valeur spécifique ou lorsque le réfrigérateur est en fonctionnement stable.
PCT/JP2015/069622 2015-07-08 2015-07-08 Procédé permettant d'évaluer la propreté d'une conduite de liquide de refroidissement Ceased WO2017006455A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106642857A (zh) * 2017-01-09 2017-05-10 中国工程物理研究院材料研究所 一种采用制冷剂的热力性质控制冷却塔风机的系统及方法
CN109253555A (zh) * 2017-07-12 2019-01-22 荏原冷热系统株式会社 压缩式制冷机
CN113390161A (zh) * 2020-03-12 2021-09-14 青岛海尔空调电子有限公司 风冷热泵热水空调机组及其控制方法
CN115235052A (zh) * 2022-07-27 2022-10-25 广州市铭汉科技股份有限公司 一种冷水机自动调节控制系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07218188A (ja) * 1994-02-04 1995-08-18 Kurita Water Ind Ltd 熱交換器の汚れ状態の推定方法及び洗浄方法
JP2501656Y2 (ja) * 1988-12-06 1996-06-19 石川島播磨重工業株式会社 熱交換器の監視装置
JPH0926804A (ja) * 1995-07-11 1997-01-28 Daidan Kk 熱源運転管理装置
JP2009030936A (ja) * 2007-07-30 2009-02-12 Kurita Water Ind Ltd 冷却水系の薬注制御方法及び装置
JP2012052733A (ja) * 2010-09-01 2012-03-15 Mitsubishi Heavy Ind Ltd ターボ冷凍機の性能評価装置
JP2012207832A (ja) * 2011-03-29 2012-10-25 Kurita Water Ind Ltd 冷凍システムにおける冷却水ラインの汚れ評価方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2501656Y2 (ja) * 1988-12-06 1996-06-19 石川島播磨重工業株式会社 熱交換器の監視装置
JPH07218188A (ja) * 1994-02-04 1995-08-18 Kurita Water Ind Ltd 熱交換器の汚れ状態の推定方法及び洗浄方法
JPH0926804A (ja) * 1995-07-11 1997-01-28 Daidan Kk 熱源運転管理装置
JP2009030936A (ja) * 2007-07-30 2009-02-12 Kurita Water Ind Ltd 冷却水系の薬注制御方法及び装置
JP2012052733A (ja) * 2010-09-01 2012-03-15 Mitsubishi Heavy Ind Ltd ターボ冷凍機の性能評価装置
JP2012207832A (ja) * 2011-03-29 2012-10-25 Kurita Water Ind Ltd 冷凍システムにおける冷却水ラインの汚れ評価方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106642857A (zh) * 2017-01-09 2017-05-10 中国工程物理研究院材料研究所 一种采用制冷剂的热力性质控制冷却塔风机的系统及方法
CN109253555A (zh) * 2017-07-12 2019-01-22 荏原冷热系统株式会社 压缩式制冷机
CN113390161A (zh) * 2020-03-12 2021-09-14 青岛海尔空调电子有限公司 风冷热泵热水空调机组及其控制方法
CN115235052A (zh) * 2022-07-27 2022-10-25 广州市铭汉科技股份有限公司 一种冷水机自动调节控制系统

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