JP2004121995A - Vacuum evaporation type distillation equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heat/sterilize the inside of distillation equipment by making good use of a heat source supplied to the distillation equipment. <P>SOLUTION: This vacuum evaporation type distillation equipment is provided with an evaporation unit 11 having a plurality of evaporators which are connected to one another in a multiple effect manner, in the first one of which a heat source and a raw water 25 are supplied and the raw water 25 is heated by the heat source 23 and in each of which evaporation/condensation is repeated successively, a condenser 12 for cooling/condensing the steam evaporated in the final evaporator of the unit 11 and an evacuating means 15 for keeping the inside of the unit 11 below atmospheric pressure. Distilled water 26 and impurity-concentrated water 27 are obtained by repeating evaporation/condensation of the water 25 in the unit 11 decompressed by the means 15. A heating/sterilizing means is arranged for heating/sterilizing this evaporation type distillation equipment by the source 23 by reducing or nulling the amount of cooling water 24 to be supplied to the condenser 12 by a cooling water volume regulating valve 22 to reduce or null the amount of the steam to be condensed in the condenser 12. <P>COPYRIGHT: (C)2004,JPO

Description

【００３２】
加熱殺菌は、冷却水流量を零として蒸留装置に熱源を供給し、原水流量を６．３（Ｌ／ｍｉｎ）（３０分保持）→３．０（Ｌ／ｍｉｎ）（３０分保持）→０（Ｌ／ｍｉｎ）（１時間保持）と変化させていった。この加熱によって蒸留装置は、原水流量が６．３（Ｌ／ｍｉｎ）の時に最終段の蒸発器の温度は６０℃、３．０（Ｌ／ｍｉｎ）で約６５℃、０（Ｌ／ｍｉｎ）で約８０℃まで昇温され、殺菌効果が得られた。
【００３３】
【発明の効果】
以上、説明したように、各請求項に記載の発明によれば、下記のような優れた効果が得られる。
請求項１に記載の発明によれば、凝縮器における水蒸気の冷却量を減少又は零とし、通常運転時に蒸留装置に供給されている熱源、原水を供給するだけで、蒸留装置の加熱殺菌を行うことが可能となり、別途加熱殺菌用の設備を設ける必要がなくなる。
【００３４】
請求項２に記載の発明によれば、原水の流量を通常の運転時よりも低減、若しくは零とすることにより、請求項１に示す発明の場合よりも蒸留装置の温度を高くすることができ、加熱殺菌効果を高めることが可能となる。
【００３５】
請求項３に記載の発明によれば、徐々に原水の流量を減少させることで、蒸留装置の温度が低い状態からでも、最上段の蒸発器（その上段に脱気室を設置した場合は脱気室）内の原水が全量蒸発することなく、蒸留装置を十分に加熱することが可能となる。
【００３６】
そして請求項１，２，３に記載の発明にかかる加熱殺菌を定期的に行うことで、蒸留水系に混入した生菌を殺菌することが可能となり、通常運転中に得られる蒸留水中の生菌、微生物数を、加熱殺菌を行わない場合に比べて、大幅に低減することが可能となる。
【図面の簡単な説明】
【図１】本発明にかかる真空蒸発式蒸留装置の一構成例を示す図である。
【図２】本発明にかかる真空蒸発式蒸留装置の他の構成例を示す図である。
【符号の説明】
１０　脱気室
１１　蒸発装置
１２　凝縮器
１３　蒸留水タンク
１４　濃縮水タンク
１５　真空手段
１６　蒸留水ポンプ
１７　濃縮水ポンプ
１８　原水流量計
１９　原水流量調整弁（原水流量調整手段）
２０　蒸留水供給弁
２１　濃縮水排水弁
２２　冷却水量調整弁（冷却量調整手段）
２３　熱源
２４　冷却水
２５　原水
２６　蒸留水
２７　濃縮水
２８　排気
２９　熱源流路
３０　冷却水流路
３１　原水供給流路
３２　蒸留水供給流路
３３　濃縮水排水流路
３４　排気流路
３４´　第二の排気流路
３５　蒸気流路
３６　蒸留水流路
４０　遮断弁
４１　水位計
４２　水位計
４３　減圧機構
４４　脱気原水流路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides industrial water, city water, factory wastewater and the like as raw water, heats the raw water by a heat source under reduced pressure, by evaporation and condensation method, distilled water, and concentrated water in which impurities in the raw water are concentrated. The present invention relates to a vacuum evaporation type distillation apparatus provided with means for easily sterilizing the vacuum evaporation type distillation apparatus.
[0002]
[Prior art]
Conventionally, a vacuum evaporative distillation apparatus can be operated even when the temperature of a heat source is relatively low (about 85 ° C.) by reducing the internal pressure of the apparatus to lower than the atmospheric pressure to reduce the boiling point temperature. It is sometimes used mainly in places where a large amount of exhaust heat at a high temperature is obtained.
[0003]
However, in this type of vacuum evaporative distillation apparatus, since the temperature inside the distillation apparatus during operation does not rise to a temperature sufficient to kill the viable bacteria, the viable bacteria propagate in the apparatus with the operation, and the resulting distilled water There was a problem that the number of viable bacteria and the dead bacteria increased.
[0004]
To solve this problem, a method of periodically cleaning and sterilizing the inside of the apparatus with a disinfectant such as hydrogen peroxide, or a method of sterilizing the distillation apparatus by heating the distillation apparatus with a separately installed heating apparatus may be used. do it.
[0005]
However, in the case of a disinfection method using a disinfectant such as hydrogen peroxide, there is a problem that a disinfectant such as hydrogen peroxide remains in distilled water for a long time even after the disinfection is completed, and disinfection using a heating device separately is also required. In the case of the method, there is a problem that not only the installation space for the heating device is required but also the cost increases.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and can perform heat sterilization in a distillation apparatus by using a heat source supplied to the distillation apparatus, and requires special equipment for sterilization. It is an object of the present invention to provide a vacuum evaporative distillation apparatus that does not have a vacuum.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 has a plurality of evaporators connected in a multiple effect, supplies a heat source and raw water to a first-stage evaporator, and heats the raw water by the heat source. An evaporator that sequentially repeats evaporation / condensation in each stage evaporator; a condenser that cools and condenses water vapor evaporated in the last stage evaporator of the evaporator; A vacuum evaporating distillation apparatus comprising: a vacuum means for maintaining the water; and repeating the evaporation and condensation of the raw water in the evaporator depressurized by the vacuum means to produce distilled water and concentrated water in which impurities are concentrated. And a heat disinfection means for heating and sterilizing the vacuum evaporative distillation apparatus with the heat source by reducing or eliminating the cooling amount of steam in the condenser. Here, the heat sterilizing means is constituted by a cooling amount adjusting means for adjusting a cooling amount of steam in the condenser. The cooling amount adjusting means is specifically a cooling water amount adjusting valve or the like in a water-cooled condenser, and a fan or the like in an air-cooled condenser.
[0008]
If the cooling amount of steam in the condenser is reduced or set to zero as described above, the heat source and raw water supplied to the distillation apparatus during normal operation are supplied, and the vacuum evaporation type distillation apparatus is heated and sterilized. Not only does not require the use of a disinfectant, but also eliminates the need to provide a separate facility for heat disinfection.
[0009]
The invention according to claim 2 has a plurality of evaporators connected in a multiple effect manner, supplies a heat source and raw water to the first-stage evaporator, heats the raw water with the heat source, and sequentially evaporates each stage. An evaporator for repeating evaporation / condensation in an evaporator, a condenser for cooling and condensing water vapor evaporated in an evaporator at the last stage of the evaporator, and vacuum means for keeping the inside of the evaporator at atmospheric pressure or lower. A vacuum evaporating distillation apparatus for producing distilled water and concentrated water in which impurities are concentrated by repeatedly evaporating and condensing raw water in an evaporator reduced in pressure by the vacuum means, wherein the steam in the condenser is Heat sterilization means for heating or sterilizing the vacuum evaporative distillation apparatus by the heat source by reducing or reducing the cooling amount of the raw water to zero or reducing the flow rate of the raw water to be supplied to the evaporator from that at the time of normal operation. Vacuum characterized by having It is a Hatsushiki distillation apparatus. Here, the heat sterilizing means is constituted by a cooling amount adjusting means for adjusting a cooling amount of steam in the condenser and a raw water amount adjusting means for adjusting a flow rate of the raw water to be supplied to the evaporator. The cooling amount adjusting means is specifically a cooling water amount adjusting valve or the like in a water-cooled condenser, and a fan or the like in an air-cooled condenser. The raw water amount adjusting means is specifically a raw water flow rate adjusting valve or the like.
[0010]
As described above, if the cooling amount of steam in the condenser is reduced or set to zero and the flow rate of the raw water is set to be reduced or set to zero as compared with the time of normal operation, vacuum evaporation distillation is further performed as compared with the case of the invention shown in claim 1. The temperature of the device can be increased, and the heat sterilization effect can be enhanced.
[0011]
According to a third aspect of the present invention, in the vacuum evaporative distillation apparatus according to the second aspect, the heat sterilizing means heats the vacuum evaporative distillation apparatus by reducing the amount of cooling in the condenser or setting the cooling amount to zero and using a heat source. A vacuum evaporative distillation apparatus characterized in that it is means for reducing the flow rate of raw water supplied to the evaporator as the temperature of the vacuum evaporative distillation apparatus rises from a flow rate during normal operation.
[0012]
As described above, if the flow rate of the raw water is gradually reduced as the temperature of the vacuum evaporative distillation apparatus rises, the uppermost evaporator (the upper evaporator is removed even if the temperature of the vacuum evaporative distillation apparatus is low). (If an air chamber is provided, the vacuum evaporation type distillation apparatus can be sufficiently heated without the entire amount of the raw water charged into the degassing chamber being evaporated).
[0013]
By periodically performing the heat sterilization according to the first, second, and third aspects of the present invention, it becomes possible to sterilize live bacteria mixed in the distilled water system, and the live bacteria in the distilled water obtained during normal operation can be sterilized. The number of bacteria and microorganisms can be significantly reduced as compared with the case where heat sterilization is not performed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing one configuration example of a vacuum evaporation type distillation apparatus (hereinafter, simply referred to as “distillation apparatus”) according to the present invention. In FIG. 1, reference numeral 11 denotes an evaporator in which a plurality of evaporators for heating raw water 25 under reduced pressure to produce distilled water are connected for multiple effects. Each evaporator in the evaporator 11 has a heat exchanger, and raw water 25 and a heat source 23 are supplied to the first (uppermost) evaporator. The raw water 25 is heated by the heat source 23 supplied through the heat source flow path 29, and the water vapor evaporated thereby is sent to the heat exchanger of the second-stage evaporator. The supplied second-stage evaporator heats and evaporates the raw water again, and cools itself by the raw water of the second-stage evaporator, condenses, and becomes distilled water. In this manner, the evaporation / condensation is sequentially repeated, and finally, the steam generated from the last (lowest) evaporator and the distilled water condensed in each evaporator are obtained. The flow rate of the raw water 25 is measured by the raw water flow meter 18, and the flow rate of the raw water 25 is adjusted by a raw water flow rate regulating valve (raw water flow rate adjusting means) 19 so that the flow rate becomes a preset value. Is supplied to the uppermost evaporator of the evaporator 11.
[0015]
Next, in the present configuration example, the cooling water 24 is used as a cooling source of the condenser 12, and is supplied to the condenser 12 through the cooling water passage 30. The distilled water from the evaporator 11 moves to the condenser 12 via the distilled water flow path 36, while the water vapor generated in the last evaporator of the evaporator 11 contains dissolved gas components contained in the raw water, It moves to the condenser 12 via the vapor passage 35 together with the volatile impurities.
[0016]
The water vapor generated in the last-stage evaporator of the evaporator 11 is condensed in the condenser 12 and stored in the distilled water tank 13 together with the distilled water moved to the condenser 12 via the distilled water flow path 36. The water level in the distilled water tank 13 is detected by, for example, a water level meter 41 or the like. When the distilled water in the distilled water tank 13 accumulates to some extent, the distilled water pump 16 is activated, and the distilled water is supplied to the outside as distilled water 26 through the distilled water pump 16, the distilled water supply passage 32, and the distilled water supply valve 20. . Here, since the pressure in the distillation apparatus is reduced, the distilled water supply valve 20 is opened after the distilled water pump 16 is started, and the distilled water 26 is supplied to the outside.
[0017]
The concentrated water 27 in which impurities in the raw water 25 are concentrated is stored in the concentrated water tank 14 from the evaporator at the last stage of the evaporator 11. The water level in the concentrated water tank 14 is detected by, for example, a water level meter 42 or the like. When the concentrated water is accumulated in the concentrated water tank 14 to some extent, the concentrated water pump 17 is started, and the concentrated water is discharged to the outside through the concentrated water pump 17, the concentrated water drain passage 33, and the concentrated water drain valve 21. Here, since the pressure in the distillation apparatus is reduced, the concentrated water drain valve 21 is opened after the concentrated water pump 17 is started, and the concentrated water 27 is discharged outside the apparatus.
[0018]
In the above example, outside air or the like flows into the distillation apparatus whose internal pressure is reduced according to the operation order of the distilled water pump 16 and the distilled water supply valve 20 and the operation order of the concentrated water pump 17 and the concentrated water drain valve 21. However, an appropriate backflow prevention mechanism such as a check valve is provided at an appropriate position downstream of the distilled water tank 13 and the concentrated water tank 14 to prevent the inflow of outside air or the like. You may.
[0019]
On the other hand, the dissolved gas and the volatile impurities in the raw water 25 conveyed to the condenser 12 together with the water vapor in the vapor passage 35 from the evaporator 11 pass through the shut-off valve 40 and the exhaust passage 34 from the vacuum means 15. The exhaust gas is exhausted outside the machine.
[0020]
In this way, during normal operation, the distillation apparatus is continuously supplied with the heat source 23, the raw water 25, and the cooling water 24, thereby performing continuous distillation and supplying the distilled water 26 to the outside.
[0021]
In the distillation apparatus shown in FIG. 1, a water-cooled condenser is used as the condenser 12, and cooling water 24 is supplied to the condenser 12 as a cooling source. However, the condenser of the present invention is limited to a water-cooled condenser. Instead, a condenser using another cooling method or a fluid (for example, air) other than cooling water may be used as a cooling source. As the vacuum means 15 for keeping the inside of the evaporator 11 under reduced pressure, any means such as a vacuum pump or an ejector may be used as long as it has a function of keeping the inside of the evaporator 11 under a predetermined reduced pressure.
[0022]
In the distillation apparatus shown in FIG. 1 described above, in the present invention (the invention according to claim 1), cooling amount adjusting means such as a cooling water amount adjusting valve 22 is provided in the cooling water flow path 30, and heat sterilization in the distillation apparatus is performed. Is performed, the flow rate of the cooling water supplied to the condenser 12 by the cooling water amount adjustment valve 22 is reduced or set to zero. By performing such an operation, the cooling amount of steam in the condenser 12 is reduced or set to zero, and if the heat source 23 is continuously supplied in this state, the raw water 25 in the distillation apparatus is heated and evaporated, and the water in the distillation apparatus is evaporated. Since the vapor pressure of the distillation apparatus rises, the distillation apparatus can be heated, and the microorganisms and bacteria in the distillation apparatus can be heated and sterilized. At that time, if the flow rate of the cooling water 24 is set to zero, the temperature rise due to the heating becomes the fastest. Since water is obtained and discharged to the outside, the heat sterilization operation may be performed with a reduced cooling amount in order to discharge microorganisms and bacteria dead by heat sterilization to the outside of the distillation apparatus.
[0023]
In the configuration example of the distillation apparatus shown in FIG. 1, a vacuum pump is used as the vacuum means 15 necessary for keeping the inside of the evaporator 11 under reduced pressure. The shutoff valve 40 that shuts off the flow path to the means 15 is closed. On the other hand, when an ejector or the like is used as the vacuum means 15, it is not particularly necessary to stop the bleeding from the evaporator 11 from the viewpoint of protection of the device, and thus the bleeding from the evaporator 11 may or may not be performed.
[0024]
In the configuration example of the distillation apparatus shown in FIG. 1, a water-cooled condenser using cooling water 24 is used as the condenser 12, so that the cooling water regulating valve 22 is provided as cooling amount regulating means. In the case where an air-cooled condenser is used, cooling of steam in the condenser 12 is performed according to the type and structure of the condenser 12 such as a fan for sending air (deceleration or stoppage of the fan) serving as cooling amount adjusting means. The heat sterilization means for sterilizing the distillation apparatus by heating the distillation apparatus with the amount reduced or eliminated is different.
[0025]
Next, in the distillation apparatus shown in FIG. 1, in another invention of the present application (the invention described in claim 2), as described above, the flow rate of the cooling water 24 is reduced or set to zero, and at the same time, supplied to the distillation apparatus. The flow rate of the raw water 25 is reduced or set to zero as compared with the normal operation. Adjustment of the flow rate of the raw water 25 is performed by raw water amount adjusting means such as the raw water flow control valve 19. As a result, since the amount of heat for heating the raw water 25 can be reduced, the temperature of the distillation apparatus can be further increased, and the microorganisms and bacteria in the distillation apparatus can be more effectively heated and sterilized. If the flow rate of the supplied raw water 25 is set to zero, the effect is maximized.
[0026]
By the way, if the distillation apparatus shown in FIG. 1 is not heated and the heat sterilization is performed by reducing the flow rate of the raw water 25 to zero or lower than that during the normal operation, the steam pressure in the distillation apparatus is still low. All of the raw water 25 in the uppermost evaporator in the evaporator 11 is evaporated, and the heat transfer by heating is deteriorated. As a result, the temperature of the evaporator 11 does not rise sufficiently. For example, if the supply amount of the raw water 25 is suddenly reduced to zero in a state where the distillation apparatus is not warmed, the evaporator at the uppermost stage of the evaporator 11 dries (all the raw water 25 evaporates), and the temperature of the evaporator at the subsequent stage rises so much. (Eg, 65 ° C. at the bottom evaporator temperature). Therefore, in another invention of the present application (invention of claim 3), in the distillation apparatus shown in FIG. 1, the flow rate of the cooling water 24 is reduced or set to zero to heat the distillation apparatus, Control means for gradually decreasing the supply amount of the raw water 25 from the supply amount during the normal operation as the temperature and the vapor pressure increase (for example, the flow rate of the cooling water 24 is reduced or set to zero by the cooling water amount adjusting valve 22 and then the predetermined amount is reduced). After a lapse of time, a control means including a computer and other electric circuits for controlling the raw water flow control valve 19 to gradually close and reduce the supply amount of the raw water 25) is provided, so that the entire distillation apparatus can be sufficiently provided. It made it possible to heat. For example, after the distillation apparatus is heated for a certain period of time by reducing or setting the flow rate of the cooling water 24 at the rated flow rate of the raw water 25 to 6.3 (L / min) during normal operation, the supply amount of the raw water 25 is reduced to 3 (L). / Min) and 0 (L / min) to control heating so that heating can be performed effectively. The effect is maximized by finally setting the supply amount of the raw water 25 to zero.
[0027]
Here, in the configuration example of the distillation apparatus shown in FIG. 1, each of the raw water flow control valve 19, the distilled water supply valve 20, the concentrated water drain valve 21, the cooling water amount control valve 22, and the shutoff valve 40 is a manual valve, an electric valve. The type is not particularly limited as long as the flow rate can be adjusted / interrupted, such as a solenoid valve.
[0028]
FIG. 2 is a diagram showing another configuration example of the distillation apparatus according to the present invention. In FIG. 2, portions denoted by the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. The difference between the distillation apparatus shown in FIG. 2 and the distillation apparatus shown in FIG. 1 is that a degassing chamber 10 for separating dissolved gas and volatile impurities in raw water 25 before supplying the same to the evaporator 11 at the upper stage of the evaporator 11. Is provided.
[0029]
At least a part of the heat source 23 is supplied to the degassing chamber 10 to heat the raw water 25 supplied from the raw water supply flow path 31 to separate dissolved gas and volatile impurities. These separated gas components are The gas is introduced into the condenser 12 via the second exhaust passage 34 ′ having the pressure reducing mechanism 43. The water vapor evaporated together with the gas components in the condenser 12 is condensed and moves to the distilled water tank 13 as distilled water, and the gas components are condensed from the final stage evaporator of the evaporator 11 together with the water vapor through the vapor passage 35 to the condenser. The residual gas component introduced into the fuel cell 12 passes through the exhaust passage 34 together with the residual gas component, and is exhausted out of the apparatus as the exhaust gas 28 by the vacuum means 15. The raw water deaerated in the deaeration chamber 10 is introduced into the uppermost evaporator in the evaporator 11 through the deaerated raw water flow path 44. With this configuration, during normal operation, since the gas component in the degassed raw water introduced into the evaporator 11 is reduced, the heat transfer coefficient in the evaporator 11 is increased, and the distillation efficiency is improved. In addition, at the time of heat sterilization, the gas components and steam heated and evaporated in the degassing chamber 10 move to the condenser 12, so that the distillation apparatus including the condenser 12 can be heated quickly.
[0030]
【Example】
Next, the present invention will be described more specifically with reference to examples.
In this example, a distillation apparatus having the following specifications was used in the configuration shown in FIG.
Raw water: Fujisawa city water temperature 25 ° C, flow rate 6.3 (L / min)
Heat source: 85 ° C hot water Flow rate 100 (L / min)
Cooling water: 32 ° C cold water Flow rate 84 (L / min)
Distilled water amount: 4.7 (L / min)
[0031]
After normal operation for one month under the above conditions, the numbers of microorganisms in the raw water and distilled water were measured (comparative example), sterilized by heat, returned to a steady state, operated for about 8 hours, and again distilled water. The number of microorganisms was counted (Example). Table 1 shows the results of the analysis.
[Table 1]

[0032]
In the heat sterilization, the heat source is supplied to the distillation apparatus with the cooling water flow rate set to zero, and the raw water flow rate is set to 6.3 (L / min) (hold for 30 minutes) → 3.0 (L / min) (held for 30 minutes) → 0. (L / min) (1 hour hold). Due to this heating, the distillation apparatus has a final stage evaporator temperature of 60 ° C when the raw water flow rate is 6.3 (L / min), about 65 ° C at 3.0 (L / min), and 0 (L / min). The temperature was raised to about 80 ° C. to obtain a bactericidal effect.
[0033]
【The invention's effect】
As described above, according to the invention described in each claim, the following excellent effects can be obtained.
According to the first aspect of the present invention, the heat sterilization of the distillation apparatus is performed only by supplying the heat source and the raw water supplied to the distillation apparatus during the normal operation by reducing or reducing the cooling amount of the steam in the condenser. This makes it unnecessary to provide a separate facility for heat sterilization.
[0034]
According to the second aspect of the present invention, the temperature of the distillation apparatus can be made higher than in the case of the first aspect of the present invention by reducing the flow rate of the raw water as compared with that during the normal operation, or by setting it to zero. Thus, the heat sterilization effect can be enhanced.
[0035]
According to the third aspect of the present invention, by gradually decreasing the flow rate of the raw water, even when the temperature of the distillation apparatus is low, the evaporator at the uppermost stage (when the degassing chamber is installed at the upper stage, the degassing is performed). The distillation apparatus can be sufficiently heated without the entire amount of the raw water in the (gas chamber) evaporating.
[0036]
By periodically performing the heat sterilization according to the invention as set forth in claims 1, 2, and 3, it becomes possible to sterilize live bacteria mixed in the distilled water system, and live bacteria in distilled water obtained during normal operation. In addition, the number of microorganisms can be significantly reduced as compared with the case where heat sterilization is not performed.
[Brief description of the drawings]
FIG. 1 is a diagram showing one configuration example of a vacuum evaporation type distillation apparatus according to the present invention.
FIG. 2 is a diagram showing another configuration example of the vacuum evaporation type distillation apparatus according to the present invention.
[Explanation of symbols]
Reference Signs List 10 Deaeration chamber 11 Evaporator 12 Condenser 13 Distilled water tank 14 Concentrated water tank 15 Vacuum means 16 Distilled water pump 17 Concentrated water pump 18 Raw water flow meter 19 Raw water flow control valve (raw water flow adjusting means)
20 Distilled water supply valve 21 Concentrated water drain valve 22 Cooling water amount adjusting valve (cooling amount adjusting means)
23 heat source 24 cooling water 25 raw water 26 distilled water 27 concentrated water 28 exhaust 29 heat source flow path 30 cooling water flow path 31 raw water supply flow path 32 distilled water supply flow path 33 concentrated water drain flow path 34 exhaust flow path 34 'second exhaust Flow path 35 Steam flow path 36 Distilled water flow path 40 Shut-off valve 41 Water level gauge 42 Water level gauge 43 Pressure reducing mechanism 44 Deaerated raw water flow path

Claims (3)

Evaporation that has multiple evaporators connected in multiple effects, supplies a heat source and raw water to the first stage evaporator, heats the raw water with this heat source, and repeats evaporation and condensation in each stage evaporator sequentially Equipment and
A condenser that cools and condenses the water vapor evaporated in the last-stage evaporator of the evaporator,
Vacuum means for keeping the inside of the evaporator at or below atmospheric pressure,
A vacuum evaporative distillation apparatus for producing distilled water and concentrated water in which impurities are concentrated by repeating evaporation and condensation of raw water in an evaporator reduced in pressure by the vacuum means,
A vacuum evaporative distillation apparatus comprising a heat sterilizing means for sterilizing the condenser by heating or sterilizing the vacuum evaporative distillation apparatus by reducing the cooling amount of steam in the condenser to zero. Evaporation that has multiple evaporators connected in multiple effects, supplies a heat source and raw water to the first stage evaporator, heats the raw water with this heat source, and repeats evaporation and condensation in each stage evaporator sequentially Equipment and
A condenser that cools and condenses the water vapor evaporated in the last-stage evaporator of the evaporator,
Vacuum means for keeping the inside of the evaporator at or below atmospheric pressure,
A vacuum evaporative distillation apparatus for producing distilled water and concentrated water in which impurities are concentrated by repeating evaporation and condensation of raw water in an evaporator reduced in pressure by the vacuum means,
The amount of cooling water vapor in the condenser is reduced or set to zero, and the flow rate of raw water supplied to the evaporator is reduced or set to zero or less than during normal operation, thereby heating the vacuum evaporative distillation apparatus by the heat source. A vacuum evaporation type distillation apparatus having a heat sterilizing means for sterilizing. The vacuum evaporative distillation apparatus according to claim 2,
The heat sterilizing means reduces the amount of cooling in the condenser or heats the vacuum evaporative distillation apparatus with a heat source as zero, and adjusts the flow rate of raw water to be supplied to the evaporator with the temperature rise of the vacuum evaporative distillation apparatus. A vacuum evaporation type distillation apparatus characterized in that it is a means for reducing the flow rate during normal operation.

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