JPH03279799A - Scale adhering preventing method in sterilization device or the like - Google Patents
Scale adhering preventing method in sterilization device or the likeInfo
- Publication number
- JPH03279799A JPH03279799A JP8037590A JP8037590A JPH03279799A JP H03279799 A JPH03279799 A JP H03279799A JP 8037590 A JP8037590 A JP 8037590A JP 8037590 A JP8037590 A JP 8037590A JP H03279799 A JPH03279799 A JP H03279799A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- gas
- heat exchanger
- temperature
- raw material
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001954 sterilising effect Effects 0.000 title claims description 7
- 238000004659 sterilization and disinfection Methods 0.000 title claims description 7
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 abstract 5
- 239000011550 stock solution Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 235000011194 food seasoning agent Nutrition 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 101100492805 Caenorhabditis elegans atm-1 gene Proteins 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、食品、医薬品業界等において各種液体を熱交
換器等を通して連続的に加熱殺菌処理する場合等に利用
される殺菌機等におけるスケール付着防止方法に関する
ものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a scale for a sterilizer used in the food, pharmaceutical industry, etc. to continuously heat sterilize various liquids through a heat exchanger, etc. This invention relates to a method for preventing adhesion.
液体を熱交換器等を通して連続的に加熱殺菌処（１）
理する場合、気泡が混入していると、熱交換器等でスケ
ールが付着発生する場合があり、品質低下（こげ臭等）
や伝熱性能の低下の原因となる。When a liquid is continuously heated and sterilized through a heat exchanger, etc. (1), if air bubbles are mixed in, scale may form on the heat exchanger, resulting in a decrease in quality (burnt odor, etc.).
This may cause a decrease in heat transfer performance.
例えば、前処理工程に、遠心分離機、濾過機、豆摺機等
が設置されている場合、液中に空気が気泡状態で混入し
ている場合がある。For example, if a centrifuge, filter, bean grinder, etc. are installed in the pretreatment process, air may be mixed into the liquid in the form of bubbles.
上記したスケールの付着を防止するには、熱交換器や加
熱器等では、液中に気泡を存在させないようにすること
が必要である。In order to prevent the above-mentioned scale adhesion, it is necessary to prevent air bubbles from being present in the liquid in heat exchangers, heaters, etc.
そこで、前処理工程と加熱殺菌処理工程との間に、気液
分離手段を設置することも可能であるが、この方式では
、装置が複雑化し、高価となる等の問題がある。Therefore, it is possible to install a gas-liquid separation means between the pretreatment step and the heat sterilization step, but this method has problems such as the equipment becoming complicated and expensive.
これが為、従来では、加熱殺菌処理工程における液体の
背圧を、加熱殺菌温度により制御させる方式を採用して
いる。即ち、加熱殺菌温度（最高液温）における飽和水
蒸気分圧Ｐｓｋｇ／ｃ＋＆をベースに、プラスαとして
、０ 、５ ｋｇ ／ ｃｔＡ〜１．０ｋｇ／ｃ＋ｆｌ
を付加した背圧π−Ｐｓ＋αで液体を流通させるように
している。For this reason, conventionally, a method has been adopted in which the back pressure of the liquid in the heat sterilization process is controlled by the heat sterilization temperature. That is, based on the saturated steam partial pressure Pskg/c+& at the heat sterilization temperature (maximum liquid temperature), plus α, 0.5 kg/ctA to 1.0 kg/c+fl
The liquid is caused to flow under a back pressure of π-Ps+α.
（２）
この方式は、水蒸気分圧のみに着目し、熱交換器内で沸
騰が起こらないように経験上定めた値をプラスαとして
加え、この和を背圧として運転させている。(2) This method focuses only on the water vapor partial pressure, adds a value determined empirically as plus α to prevent boiling in the heat exchanger, and operates with this sum as the back pressure.
従来の背圧設定方式は、スケールの付着を防止するとい
うことよりも、昇温（加熱温度）能力を中心に考えて設
定していたもので、この方式であると、液中の溶存ガス
及び含有ガス粒子が増大すると、スケール付着が激しく
なり、運転が出来なくなっていた。The conventional back pressure setting method focused on the ability to raise the temperature (heating temperature) rather than preventing scale adhesion. With this method, dissolved gas and As the amount of gas particles increased, scale adhesion became more severe, making it impossible to operate.
本発明は、従来の背圧設定方式の上記問題点に鑑みて提
案されたもので、その目的とするところは、液体の物性
（含有ガス量）と処理温度とから適正背圧を設定するこ
とにより、スケールの付着を防止すると共に、過大な背
圧設定による弊害（流量低下、ポンプ動力の無駄発生等
）を回避し得る殺菌機等におけるスケール付着防止方法
を提供しようとするものである。The present invention was proposed in view of the above problems of the conventional back pressure setting method, and its purpose is to set an appropriate back pressure based on the physical properties of the liquid (gas content) and processing temperature. Accordingly, the present invention aims to provide a method for preventing scale adhesion in a sterilizer, etc., which can prevent scale adhesion and avoid harmful effects caused by excessive back pressure settings (lower flow rate, wasted pump power, etc.).
（３）
上記目的を達成するため、本発明は、液体を熱交換器、
加熱器等に連続的に供給して殺菌処理する殺菌機等にお
いて、原液中の含有ガス量を予め検出し、かつ、加熱温
度から、当該温度における飽和水蒸気分圧と上記含有ガ
スの分圧とを演算させて、これら両分圧の和により、運
転中の液体の背圧を制御させるようになしたものである
。(3) In order to achieve the above object, the present invention provides a heat exchanger for a liquid,
In a sterilizer, etc. that continuously supplies water to a heater, etc. for sterilization, the amount of gas contained in the stock solution is detected in advance, and from the heating temperature, the saturated steam partial pressure at that temperature and the partial pressure of the gas contained above are calculated. is calculated, and the back pressure of the liquid during operation is controlled by the sum of these two partial pressures.
スケール付着発生の原因となる気泡は、大別して、蒸気
泡とガス泡である。Bubbles that cause scale adhesion can be broadly classified into vapor bubbles and gas bubbles.
蒸気泡をなくすには、加熱温度における飽和水蒸気分圧
と同一の背圧を液体に付与すればよい。To eliminate vapor bubbles, a back pressure equal to the saturated water vapor partial pressure at the heating temperature may be applied to the liquid.
しかし、これだけでは、ガス泡はなくならない。However, this alone will not eliminate gas bubbles.
そこで、本発明は、当該ガスの蒸気加熱温度におけるガ
ス分圧に相当する圧力を液体に付加して付与することに
よって、当該ガスの気泡をもなくすようにしている。Therefore, in the present invention, bubbles in the gas are eliminated by applying a pressure corresponding to the partial pressure of the gas at the steam heating temperature to the liquid.
第１図は本発明方法を実施する装置の概略構成図であっ
て、（１）は熱交換器、（２）はガス量（４）
検出器、（３）は温度検出器、（４）は演算器、（５）
は調節計、（６）は背圧弁、（７）は背圧計を示してい
る。FIG. 1 is a schematic diagram of an apparatus for implementing the method of the present invention, in which (1) is a heat exchanger, (2) is a gas amount (4) detector, (3) is a temperature detector, (4) is a is a computing unit, (5)
indicates a controller, (6) indicates a back pressure valve, and (7) indicates a back pressure gauge.
熱交換器（１）は、相互に独立した原液流路（８）とス
チーム等の加熱媒体流路（９）とを有し、チューブ、プ
レート型又はスパイラル型のいずれであってもよい。The heat exchanger (1) has a stock solution flow path (8) and a heating medium flow path (9) such as steam, which are independent from each other, and may be of a tube type, a plate type, or a spiral type.
ガス量検出器（２）は、熱交換器（１）の入口側の原液
流路（８ａ）に設置され、原液中の含有ガス量をガスの
モル分率Ｃ６として検出させるものである。The gas amount detector (2) is installed in the stock solution flow path (8a) on the inlet side of the heat exchanger (1), and detects the amount of gas contained in the stock solution as a gas mole fraction C6.
温度検出器（３）は、熱交換器（１）内での原液の加熱
温度（最高液温−加熱媒体温度）ｔｓ′Ｃを検出させる
ためのものであって、第１図の実施例では、熱交換器（
１）の出口側の処理液流路（８ｂ）に設けた場合を示し
ているが、他の個所に設けてもよい。The temperature detector (3) is for detecting the heating temperature (maximum liquid temperature - heating medium temperature) ts'C of the stock solution in the heat exchanger (1), and in the embodiment shown in FIG. ,Heat exchanger(
1), the case is shown in which it is provided in the processing liquid flow path (8b) on the outlet side, but it may be provided in other locations.
演算器（４）は、ガス量検出器（２）の検出値及び温度
検出器（３）の検出温度とから、適正背圧ｚ＝Ｐｓ ＋
Ｐｃ （ｋｇ／ｃｌｊｌ）を演算させ、調節計（５）
（５）を制御するものである。ここで、Ｐｓは、飽和水
蒸気分圧であり、Ｐｃはガス分圧である。The computing unit (4) determines the appropriate back pressure z=Ps + from the detected value of the gas amount detector (2) and the detected temperature of the temperature detector (3).
It calculates Pc (kg/cljl) and controls the controller (5) (5). Here, Ps is the saturated water vapor partial pressure, and Pc is the gas partial pressure.
調節計（５）は、演算器（４）の演算結果により背圧弁
（６）を制御するものである。The controller (5) controls the back pressure valve (6) based on the calculation results of the calculator (4).
背圧弁（６）は、熱交換器（１）の出口側の処理液流路
（８ｂ）に設けてあり、調節計（５）により、熱交換器
（１）内を通る原液の圧力を適正背圧に設定制御される
ものである。尚、背圧計（７）は、熱交換器（１）内の
原液圧力を表示するものであり、調節計（５）にフィー
ドバックさせるようにすることも可能である。The back pressure valve (6) is provided in the treated liquid flow path (8b) on the outlet side of the heat exchanger (1), and uses a controller (5) to adjust the pressure of the raw liquid passing through the heat exchanger (1) to an appropriate level. The setting is controlled by the back pressure. Note that the back pressure gauge (7) displays the pressure of the stock solution in the heat exchanger (1), and it is also possible to feed back the pressure to the controller (5).
上述したガス量検出器（２）により検出したガスのモル
分率から、ガス分圧を求めるには、ヘンリーの法則を応
用して次式より求める。To obtain the gas partial pressure from the mole fraction of the gas detected by the gas amount detector (2) described above, the gas partial pressure is obtained from the following equation by applying Henry's law.
Ｐ、＝ＥＣ。P,=EC.
Ｃ６：液相中のガスのモル分率
Ｅ：ヘンリ一定数（ａｔｍ １モル分率）Ｐ６ ：気相
中のガス分圧（ａｔｍ ）上記ガス分圧Ｐ６と飽和水蒸
気分圧Ｐｓ とから、適正背圧πをπ−Ｐｓ ＋Ｐ＠と
して求めさせ、（６）
この背圧πによって、調節計（５）を介し背圧弁（６）
を制御し、熱交換器（１）内を通る液体の圧力を上記背
圧に設定する。これらの演算は、演算器（４）内で行わ
せるもので、演算器（４）内には、各加熱温度毎のヘン
リ一定数表及び飽和水蒸気分圧表を記憶させておき、温
度検出器（３）の検出温度により、当該温度に対応した
飽和水蒸気分圧Ｐｓ及び当該ガスのヘンリ一定数Ｅを選
出し、前記した演算を行うように構成されている。C6: Mole fraction of gas in liquid phase E: Henry's constant (ATM 1 mole fraction) P6: Partial pressure of gas in gas phase (ATM) Appropriate from the above gas partial pressure P6 and saturated water vapor partial pressure Ps The back pressure π is determined as π-Ps + P@, and (6) this back pressure π is used to control the back pressure valve (6) via the controller (5).
is controlled, and the pressure of the liquid passing through the heat exchanger (1) is set to the above-mentioned back pressure. These calculations are performed in the calculator (4), and the Henry constant table and saturated water vapor partial pressure table for each heating temperature are stored in the calculator (4). Based on the detected temperature in (3), the saturated steam partial pressure Ps corresponding to the temperature and the Henry constant number E of the gas are selected, and the above-mentioned calculations are performed.
実験データ
上記実験データは、本発明の方法により得られた背圧で
運転し、いずれもスケール付着がなかったものである。Experimental data The above experimental data was obtained by operating with the back pressure obtained by the method of the present invention, and no scale was observed in any case.
尚、生呉（なまご）とは、ダイズをすり潰した粒子形態
が含まれた液体である。Note that Namago is a liquid containing particles of ground soybeans.
上記実験データ中、調味液を例にとって、従来（７） の背圧設定方法と、本発明の方法との相違を説明する。In the above experimental data, taking the seasoning liquid as an example, conventional (7) Differences between the back pressure setting method and the method of the present invention will be explained.
この例では、加熱温度が１２０°Ｃであり、従来の場合
では、１２０°Ｃにおける飽和水蒸気分圧Ｐｓ −２ｋ
ｇ／ｃ＋ｆｉに、プラスαとして、０．５〜１．０ｋｇ
／ ｃ＋］の範囲の種々の圧力を付加してみたところ
、いずれの場合にも、スケール付着があった。In this example, the heating temperature is 120°C, and in the conventional case, the saturated water vapor partial pressure Ps −2k at 120°C
g/c+fi, plus α, 0.5 to 1.0 kg
/c+], scale adhesion occurred in all cases.
これに対し、本発明の方法では、調味液中の含有ガス成
分が空気として、その含有量をガス量検出器（２）で検
出したところ、ガスのモル分率Ｃ６は、
Ｃ，−２，６２ｘｌＯ−’
を得た。On the other hand, in the method of the present invention, the gas component contained in the seasoning liquid is air, and when the content is detected by the gas amount detector (2), the molar fraction C6 of the gas is C, -2, 62xlO-' was obtained.
一方１２０°Ｃにおける空気のヘンリ一定数Ｅは、１０
．７Ｘ１０”４である。On the other hand, the Henry constant E of air at 120°C is 10
．． It is 7×10”4.
これらをＰＧ＝ＥＣＧに代入して計算すると、Ｐ ｃ
−１０，７Ｘ１０”Ｘ２．６２Ｘ１０−”； ２．８が
得られた。Substituting these into PG=ECG and calculating, P c
-10,7X10"X2.62X10-"; 2.8 was obtained.
上記Ｐ０と、Ｐｓとを加えたものが適正背圧である。The sum of the above P0 and Ps is the appropriate back pressure.
（８）
ｙｔ −Ｐ ｓ ＋ Ｐ ｃ ＝ ２ ＋２．８＝４．
８但し、この値は、絶対圧基準であり、大気圧基準に直
すと、４．８−１ ＝ ３．８ｋｇ／ｃ＋ｌｌｃ；とな
る。(8) yt-Ps+Pc=2+2.8=4.
8 However, this value is based on absolute pressure, and when converted to atmospheric pressure, it becomes 4.8-1 = 3.8 kg/c+llc;
従って、上記データに示す調味液に対しては、適正背圧
π−３，８ｋｇ ／ ｃｒｌ Ｇとして設定した場合に
は、スケールの付着がない最適条件を設定したことにな
る。Therefore, for the seasoning liquid shown in the above data, when the appropriate back pressure is set as π-3.8 kg/crl G, the optimum conditions are set without scale adhesion.
上記した実施例は、熱交換器の場合で本発明を説明した
が、他の加熱器等にも適用でき、また、蒸発器の予熱器
等にも適用できる。In the embodiments described above, the present invention was explained in the case of a heat exchanger, but it can also be applied to other heaters, etc., and can also be applied to a preheater of an evaporator.
本発明によれば、運転中の液体の背圧を、加熱温度にお
ける飽和水蒸気分圧と含有ガスの分圧の和として設定制
御させているため、スケール付着防止の適正背圧条件に
設定していることになり、スケール付着が防止できるこ
とは勿論のこと、特に、背圧を必要以上に上昇させるこ
とによる弊害をも回避でき、極めて合理的である。According to the present invention, the back pressure of the liquid during operation is set and controlled as the sum of the saturated water vapor partial pressure at the heating temperature and the partial pressure of the contained gas, so it is possible to set the back pressure to an appropriate back pressure condition to prevent scale adhesion. This is extremely rational, not only can scale adhesion be prevented, but also the adverse effects of increasing back pressure more than necessary can be avoided.
第１図は本発明方法を実施する装置の概略構成（９） 図である。 （１）−熱交換器、 （３）−温度検出器、 （５）−調節計、 （８）−原液流路、 （２） （４） （６） （９） ガス量検出器、 演算器、 背圧弁、 加熱媒体流路。 Figure 1 shows a schematic configuration (9) of an apparatus for carrying out the method of the present invention. It is a diagram. (1) - heat exchanger, (3)-temperature detector; (5)-controller, (8) - stock solution flow path; (2) (4) (6) (9) gas amount detector, arithmetic unit, back pressure valve, Heating medium flow path.
Claims (1)
菌処理する殺菌機等において、 原液中の含有ガス量を予め検出し、かつ、加熱温度から
、当該温度における飽和水蒸気分圧と上記含有ガスの分
圧とを演算させて、これら両分圧の和により、運転中の
液体の背圧を制御させるようになしたことを特徴とする
殺菌機等におけるスケール付着防止方法。(1) In sterilizers, etc. that continuously supply liquid to a heat exchanger, heater, etc. for sterilization, the amount of gas contained in the raw liquid is detected in advance, and the amount of saturated water vapor at that temperature is determined from the heating temperature. A method for preventing scale adhesion in a sterilizer, etc., characterized in that the back pressure of a liquid during operation is controlled by calculating the pressure and the partial pressure of the contained gas, and by the sum of these partial pressures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2080375A JP3012874B2 (en) | 1990-03-27 | 1990-03-27 | Scale adhesion prevention method in sterilizers, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2080375A JP3012874B2 (en) | 1990-03-27 | 1990-03-27 | Scale adhesion prevention method in sterilizers, etc. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03279799A true JPH03279799A (en) | 1991-12-10 |
| JP3012874B2 JP3012874B2 (en) | 2000-02-28 |
Family
ID=13716534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2080375A Expired - Fee Related JP3012874B2 (en) | 1990-03-27 | 1990-03-27 | Scale adhesion prevention method in sterilizers, etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3012874B2 (en) |
-
1990
- 1990-03-27 JP JP2080375A patent/JP3012874B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3012874B2 (en) | 2000-02-28 |
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