JP2013066838A - Multieffect evaporator-type distilled water manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multieffect evaporator-type distilled water manufacturing apparatus capable of efficiently separating pure steam from steam-water mixed solution by arranging a steam-water separation mechanism for applying centrifugal force to the steam-water mixed solution generated in a heating chamber of each evaporator in a lower chamber of each evaporator.SOLUTION: The multieffect evaporator-type distilled water manufacturing apparatus includes: a preheating means for supply water; a plurality of evaporators for successively generating steam-water mixed solution from the preheated supply water; a steam-water separation means for separating the generated steam-water mixed solution into steam and water; a condenser for cooling the steam/water separated pure steam with the supply water and cooling water to generate distilled water; and an outer air introducing means connected to the condenser. In the manufacturing apparatus, the steam-water separation mechanism is arranged in the lower chamber of each evaporator, the steam-water separation mechanism includes a spiral fin arranged between an outer cylinder of the lower chamber and an inner cylinder inserted into the center part of the lower chamber, and the steam-water separation mechanism separates pure stem from the steam-water mixed solution by applying centrifugal force to the steam-water mixed solution.

Description

  The present invention relates to a multi-effect can-type distilled water production apparatus, and more particularly to an improvement of a multi-effect can-type distilled water production apparatus composed of a plurality of vertical evaporators and their attached devices. For example, various pharmaceutical manufacturing factories and medical sites require distilled water suitable for GMP (standards for manufacturing and quality control of pharmaceuticals and quasi-drugs) and the Japanese Pharmacopoeia. The present invention relates to an improvement of a multi-effect can-type distilled water production apparatus for producing such distilled water.

  Conventionally, as a multi-effect can-type distilled water production apparatus as described above, supply water preheating means, a plurality of evaporators for sequentially generating a mixture of air and water from the preheated supply water, and the generated mixture of air and water An apparatus is known that includes an air / water separation means, a condenser that cools the pure steam separated from the air / water with supply water and cooling water to form distilled water, and an outside air introduction means that is connected to the condenser (for example, Patent Documents). 1 and 2).

  However, in such a conventional multi-effect can-type distilled water production apparatus, the pure water does not evaporate upward in the lower chamber of the evaporator by using the gas-water mixture generated in the heating chamber of the evaporator. Since the feed water (hereinafter also simply referred to as saturated water) is simply separated by specific gravity downward, the steam-water mixture efficiency is poor, and some saturated water is brought in along with pure steam. There's a problem.

Japanese Patent Laid-Open No. 60-051588 JP-A-10-296236

  The problem to be solved by the present invention is to provide a steam separation mechanism that applies a centrifugal force directly to the downward flow of the steam-water mixture generated in the heating chamber of each evaporator in the lower chamber of each evaporator. An object of the present invention is to provide a multi-effect can-type distilled water production apparatus capable of efficiently separating pure steam from the gas-water mixture.

  The present invention that solves the above-mentioned problems is a feed water preheating means, a plurality of evaporators that sequentially generate a steam-water mixture from the preheated feed water, a steam-water separation means for the generated steam-water mixture, In a multi-effect can-type distilled water production apparatus comprising a condenser that cools pure steam separated by steam with supply water and cooling water to form distilled water, and an outside air introducing means connected to the condenser, a lower chamber of each evaporator The air / water separation mechanism is provided with a helical fin provided between the outer cylinder of the lower chamber and the inner cylinder inserted in the center of the lower chamber, A multi-effect can-type distilled water producing apparatus is characterized in that a pure steam is separated from the air / water mixture by applying a centrifugal force to the air / water mixture by the air / water separation mechanism.

  The multi-effect can-type distilled water production apparatus (hereinafter simply referred to as the apparatus of the present invention) according to the present invention is similar to the conventional multi-effect can-type distilled water production apparatus. A plurality of evaporators that sequentially generate a water mixture, a steam separator for the generated steam / water mixture, a condenser that cools the pure steam separated by steam with supply water and cooling water to form distilled water, And an outside air introducing means connected to the capacitor.

  In the apparatus of the present invention, a steam / water separation mechanism is provided in each lower chamber of the plurality of evaporators as the steam / water separation means. Each evaporator has an upper chamber that feeds supply water and saturated water to the heat transfer tube of the heating chamber, a heating chamber that indirectly heats the supply water and saturated water sent to the heat transfer tube with heating steam, The generated gas / water mixture is roughly divided into lower chambers for separating pure steam and saturated water. In the apparatus of the present invention, each of the lower chambers of the evaporator is provided with an air / water separation mechanism. .

  In the apparatus of the present invention, the steam-water separation mechanism provided in the lower chamber of each evaporator has a helical fin provided between the outer cylinder of the lower chamber and the inner cylinder inserted in the center of the lower chamber. I have. The apparatus of the present invention applies centrifugal force to the air / water mixture falling into the lower chamber by swirling with a spiral fin, and separates pure vapor from the air / water mixture by the centrifugal force. ing. Each lower chamber is preferably provided with a spiral blade swirling in the same direction as the spiral fin above the spiral fin, and is separated while rotating with the spiral fin below the spiral fin. It is preferable to provide a liquid collecting member for collecting saturated water in the central part and facilitating discharge from the lower chamber. As the liquid collecting member, as will be described in detail later, a disc upper member that is spaced apart from the bottom surface of the lower chamber and supported in the horizontal direction, and is suspended from the peripheral portion of the disc upper member at a predetermined interval. It is preferable to provide a plurality of cross-sectionally U-shaped members and collect saturated water separated in the central portion while being rotated by the helical fins by these U-shaped members.

  In the apparatus of the present invention, a steam / water separator can be connected to the downstream side of each evaporator, but the steam / water separator is preferably provided with a steam / water separation mechanism. Such a steam-water separation mechanism includes a spiral fin provided between an outer cylinder of the steam-water separator and a closed inner cylinder inserted in the center of the steam-water separator. It is preferable to apply a centrifugal force to pure steam containing fine water droplets by a separation mechanism to separate the fine water droplets from the pure vapor.

  Furthermore, in the apparatus of the present invention, it is preferable to provide a degassing mechanism in the upper chamber of the first evaporator in order to reduce the content of the generated pure steam and the non-condensable gas of distilled water to be produced. As the deaeration mechanism, a flat conical member as a whole is provided in the upper stage, and an overall ring-shaped member having an inclined surface that descends toward the center part is provided in the lower stage. It is preferable to deaerate while flowing in a thin film along each surface of the conical member and the lower ring member. In some cases, such a deaeration mechanism can be provided in the upper chamber of the second and subsequent evaporators.

  According to the present invention, since the steam / water separation mechanism is provided in the lower chamber of each evaporator, the centrifugal force is applied to the steam / water mixture generated in the heating chamber of each evaporator. There is an effect that it can be separated efficiently.

1 is an overall view illustrating an apparatus of the present invention. The expanded longitudinal cross-sectional view which shows the lower chamber of the 1st evaporator in the apparatus of this invention of FIG. 1, and its steam-water separation mechanism. The side view which shows the helical fin in the steam-water separation mechanism of FIG. The top view which shows the spiral blade in the steam-water separation mechanism of FIG. FIG. 2 is an enlarged cross-sectional view showing a lower chamber of a first evaporator and a liquid collecting member thereof in the apparatus of the present invention shown in FIG. 1. FIG. 2 is an enlarged longitudinal sectional view showing a steam / water separator and a steam / water separation mechanism in the apparatus of the present invention of FIG. 1. FIG. 2 is an enlarged longitudinal sectional view showing an upper chamber of a first evaporator and a deaeration mechanism thereof in the apparatus of the present invention shown in FIG. 1.

  The apparatus of the present invention will be described with reference to FIG. The apparatus of the present invention illustrated in FIG. 1 includes a total of three first evaporators 70, second evaporators 80, and third evaporators 90. The steam separators 75, 85, and 95 are connected to the downstream sides of the first evaporator 70, the second evaporator 80, and the third evaporator 90, and the condenser is connected to the downstream side of the steam separator 95. Has been. The capacitor is composed of the first capacitor 30 and the second capacitor 40, the steam separator 95 is connected to the first capacitor 30, the second capacitor 40 is connected to the first capacitor 30, and the second capacitor 40 has A distilled water outlet pipe 4 is connected.

  The first evaporator 70, the second evaporator 80, and the third evaporator 90 are roughly divided into three chambers: an upper chamber 70A, 80A, 90A, a heating chamber 70B, 80B, 90B, and a lower chamber 70C, 80C, 90C. A plurality of heat transfer tubes 70D, 80D, 90D extending from the upper chambers 70A, 80A, 90A to the lower chambers 70C, 80C, 90C are passed through the heating chambers 70B, 80B, 90B.

  A steam / water separation mechanism is provided in the lower chambers 70C, 80C, and 90C of each evaporator. Since the air / water separation mechanism of the lower chambers 80C and 90C is the same as the air / water separation mechanism of the lower chamber 70C, the air / water separation mechanism of the lower chamber 70C will be described below. As shown in FIGS. 2 and 3, the air / water separation mechanism of the lower chamber 70C of the first evaporator 70 is formed between an outer cylinder 70L of the lower chamber 70C and an inner cylinder 70M inserted in the center of the lower chamber 70C. A spiral fin 70N provided on the air-water mixture is provided, and the air-water mixture is subjected to centrifugal force by the air-water separation mechanism to separate pure steam from the air-water mixture. In the apparatus of the present invention illustrated in FIG. 1, as shown in FIGS. 3 to 5, in the lower chamber 70 </ b> C, a spiral blade 70 </ b> K swirling in the same direction as the spiral fin 70 </ b> N is disposed above the spiral fin 70 </ b> N. Also provided below the spiral fin 70N is a liquid collection member 70P for collecting saturated water separated while rotating by the spiral fin 70N in the central portion and facilitating discharge from the lower chamber 70C. It has been. In the case of the illustrated apparatus of the present invention, the liquid collection member 70P protrudes from a disk upper member 70Q supported in a horizontal direction spaced apart from the bottom surface forming the lower chamber 70C, and a lower surface peripheral portion of the disk upper member 70Q. A total of four U-shaped members 70R having a transverse cross section are provided, and by these U-shaped members 70R, saturated water separated while rotating is collected in the central portion.

  The steam separators 75, 85, and 95 connected to the downstream side of each evaporator also have a steam / water separation mechanism. Since the steam-water separation mechanism of the steam-water separators 85 and 95 is the same as the steam-water separation mechanism of the steam-water separator 75, the steam-water separation mechanism of the steam-water separator 75 will be described below. As shown in FIG. 5, the steam / water separation mechanism of the steam / water separator 75 is formed between an outer cylinder 75 </ b> J of the steam / water separator 75 and an inner cylinder 75 </ b> K with a closed tip inserted in the center of the steam / water separator 75. The spiral fin 75L has the same configuration as that of the spiral fin 70N, and a centrifugal force is applied to pure steam containing fine water droplets by the air-water separation mechanism. Is added to separate fine water droplets from pure steam.

  Further, a deaeration mechanism is provided in the upper chamber 70 </ b> A of the first evaporator 70. This deaeration mechanism includes a conical member 70S as a whole supported by a total of three flat plate-like support members 70V on the upper lid 70U, and descends toward the center supported by the outer cylinder 70W of the upper chamber 70A. A ring-shaped member 70T as a whole having an inclined surface is provided in the lower stage, and the degassing mechanism causes the supply water to fall into a thin film shape for deaeration.

  The device of the present invention will be described in more detail with reference to FIG. In FIG. 1, reference numeral 1 denotes a supply water inlet pipe, which is connected to a supply water inlet nozzle of the first condenser 30. The supply water inlet pipe 1 is provided with a supply water pump 1B, a pressure sensor 1C, a flow meter 1D, an automatic on-off valve 1E, and a manual water amount adjustment valve 1F.

  The 1st capacitor | condenser 30 cools and condenses the pure vapor | steam used as distilled water during the distilled water manufacture driving | operation with the 2nd capacitor | condenser 40, Both are double tube plate type multi-tube cylindrical heat exchangers. In the first condenser 30, the supply water of the supply water inlet pipe 1 is used for cooling when passing through the heat transfer pipe of the first condenser 30 and is heated by itself. In the second condenser 40, the cooling water sent from the cooling water inlet pipe 8 cools the inside through the heat transfer pipe of the second condenser 40, and is heated and discharged from the cooling water outlet pipe 9. 8C is a proportional control valve for adjusting the amount of cooling water so that the temperature of distilled water produced from the second condenser 40 is maintained at a set temperature (for example, 95 to 105 ° C.) by a temperature sensor 4B described later.

  The first condenser 30 is provided with an inlet for pure steam sent from the steam separator 95 and an inlet for condensed water produced in the heating chamber 90 </ b> B of the third evaporator 90. Pure steam and condensed water introduced into the first condenser 30 are condensed and cooled by the heat transfer tube of the first condenser 30 to be distilled water, discharged from the distilled water outlet at the lower part of the first condenser 30, and provided in the lower stage. The second capacitor 40 is entered.

  The upper part of the first condenser 30 is provided with a non-condensable gas vent for removing the non-condensable gas accumulated in the first condenser 30 during the distilled water production operation. A non-condensable gas outlet pipe 6 is connected. The non-condensable gas outlet pipe 6 is provided with a check valve 6C and a manual valve 6D that act in the direction of extracting the non-condensable gas. When the production of distilled water is suspended, if the cooling water is supplied to the heat transfer tube of the second condenser 40 to condense the pure steam remaining inside the apparatus, the inside tends to become negative pressure. In order to prevent such negative pressure, outside air is sucked in from the outside air suction pipe 15 and microorganisms and fine particles contained in the outside air are removed by the vent filter 6F, and then outside air is introduced into the apparatus through the check valve 6B. Prevent pressure. The check valve 6B is a check valve that allows only the introduction of outside air. The vent filter 6 </ b> F can be steam sterilized with pure steam introduced through a pipe 77 branched from the steam pipe 76 connecting the steam separator 75 and the second evaporator 80. The pure steam at this time is obtained by removing the non-condensable gas by the deaeration mechanism provided in the upper chamber 70A of the first evaporator 70 to reduce the content of the non-condensable gas, and is used for steam sterilization. Suitable for

  A discharge port is provided at the lower portion of the first capacitor 30, and pure steam and condensed water that have not been condensed inside the first capacitor 30 are discharged to the second capacitor 40. A receiving port is provided in the upper part of the second capacitor 40, and pure steam and condensed water that have not been condensed inside the first capacitor 30 flow from the receiving port. The pure steam that has flowed in is condensed in the heat transfer tube of the second condenser 40 and is discharged from the distilled water outlet pipe 4 together with the condensed water that has flowed in from the first condenser 30. At this time, the cooling water amount is adjusted so as to maintain the set temperature of the temperature sensor 4B (usually 95 to 105 ° C.).

  The first condenser 30 is connected to the first evaporator 70 via the exhaust heat recovery device 50 and the preheater 60, and supplies supply water to the first evaporator. Both the exhaust heat recovery device 50 and the preheater 60 are double tube plate type multi-tube cylindrical heat exchangers. The exhaust heat recovery device 50 is provided with a port for receiving the steam drain of the preheater 60 and the first evaporator 70, and the supplied water is preheated by the exhaust heat recovery device 50 and the preheater 60 and then preheated. The high temperature supplied water is supplied to the first evaporator 70. On the other hand, the temperature of the steam drain that has been heat-recovered decreases, and flows out of the steam drain outlet pipe 3 via the check valve 3B. In FIG. 1, 2 is a steam inlet pipe for supplying steam to the preheater 60 and the heating chamber 70B of the first evaporator 70, and 2B is a manual on-off valve. 71 is a steam drain discharge pipe for discharging the steam drain of the heating chamber 70B, 71A is a steam trap, and 71B is a check valve.

  The first evaporator 70 is a double tube plate type multi-tube cylindrical heat exchanger that efficiently evaporates a part of the supplied water by heat exchange with heating steam to obtain pure steam. It is divided into an upper chamber 70A to be introduced, a heating chamber 70B into which heated steam is introduced, and a lower chamber 70C into which a gas / water mixture of pure steam and saturated water is introduced. A plurality of heat transfer tubes 70D for guiding the preheated water supplied from the chamber 70A to the lower chamber 70C are inserted. A heating steam supply port is provided in the upper part of the heating chamber 70B, and a steam drain discharge pipe 71 that guides the drain of the heating steam to the outside of the can is connected to the lower part of the heating chamber 70B. The discharge side end of the steam drain discharge pipe 71 is connected to the exhaust heat recovery unit 50. The upper portion of the lower chamber 70C is provided with a pure steam discharge port, and the bottom portion is provided with a saturated water discharge port that has not evaporated.

  The preheated water that has entered the upper chamber 70A of the first evaporator 70 is degassed by the degassing mechanism described above with reference to FIG. 7, and then passes through the heat transfer tube 70D to reach the lower chamber 70C. It is heated by the heated steam to be in a gas-liquid mixed state and falls into the lower chamber 70C where it is separated into pure steam and saturated water by the steam-water separation mechanism described above with reference to FIGS. It reaches the upper steam outlet and the saturated water descends and is discharged from the lower saturated water outlet. 72 is a saturated water pipe, one end of which is connected to the saturated water discharge port at the bottom of the first evaporator 70 and the other end is connected to the connection port of the upper chamber 80A of the second evaporator 80, Water is supplied to the upper chamber 80 </ b> A of the second evaporator 80. Reference numeral 72A denotes an orifice provided in the saturated water pipe 72, and an orifice plate having an orifice hole with a predetermined hole diameter is interposed through a packing of the saturated water pipe 72. Each of the orifices to be described later has the same structure, but each orifice has a predetermined hole diameter.

  Between the pure steam discharge port of the first evaporator 70 and the steam supply port of the heating chamber 80B of the second evaporator 80, pure steam serving as a heating source of the second evaporator is passed through the steam / water separator 75. A steam pipe 73 to be sent is connected. From the pure steam sent to the steam separator 75, fine water droplets are removed by the steam / water separation mechanism described above with reference to FIG. 6, and the removed fine water droplets are placed in the lower chamber of the second evaporator 80 via the orifice 75D. Enter 80C.

  Unlike the first evaporator 70, the second evaporator 80 is a multi-tube cylindrical heat exchanger that does not have a double tube plate, and the saturated water that has entered the upper chamber 80A passes through the heat transfer tube 80D to the lower chamber. While reaching 80C, it is heated by pure steam in the heating chamber 80B, becomes a gas-liquid mixed state and falls into the lower chamber 80C, and the gas-liquid mixed solution is separated from the lower chamber 70C of the first evaporator 70 in the lower chamber 60C. It is separated into pure steam and saturated water by the same steam separation mechanism, and the pure steam rises to reach the upper steam discharge port, and the saturated water descends and is discharged from the lower saturated water discharge port. 82 is a saturated water pipe, one end of which is connected to the saturated water discharge port at the bottom of the second evaporator 80 and the other end is connected to the connection port of the upper chamber 90 </ b> A of the third evaporator 90. Is supplied to the upper chamber 90 </ b> A of the third evaporator 90. 82 A is an orifice provided in the saturated water pipe 82.

  81 is a condensate water pipe that guides the condensed water generated by heat exchange in the heating chamber 80B of the second evaporator 80 to the lower part of the heating chamber 90B of the third evaporator 90, and 81A is a condensate water pipe. This is an orifice installed in 81. The steam outlet of the second evaporator 80 and the steam supply port of the heating chamber 90 </ b> B of the third evaporator 90 are connected by a steam pipe 83, and the steam pipe 83 has the same structure as the steam separator 75. A water separator 85 is interposed, and fine water droplets removed by the steam separator 85 enter the lower chamber 90C of the third evaporator through the orifice 86A.

  The structure of the third evaporator 90 is the same as that of the second evaporator 80. The saturated water supplied by the saturated water pipe 82 is partially evaporated by heat exchange with the steam, and further, pure steam and saturated water It is an evaporator used as an air-water mixture. The third evaporator 90 is divided into an upper chamber 90A into which saturated water is introduced, a heating chamber 90B into which steam is introduced, and a lower chamber 90C into which an air / water mixture is introduced. The heating chamber 90B is provided with a heat transfer tube 90D for introducing saturated water from the upper chamber 90A to the lower chamber 90C. The heating chamber 90B has a supply port for introducing pure steam and pure steam condensed by heat exchange. A condensed water discharge pipe 91 for discharging the condensed water from the bottom to the outside of the can is provided. A steam discharge port is provided at the upper part of the lower chamber 90C, and a saturated water discharge port is provided at the bottom of the lower chamber 90C. In the third evaporator 90, the saturated water that has entered the upper chamber 90A passes through the heat transfer tube 90D and reaches the lower chamber 90E, and is heated by the pure steam in the heating chamber 90B to become a gas-water mixture, thereby forming the lower chamber 90C. Here, the steam is separated into pure steam and saturated water by the same steam separation mechanism as the lower chamber 70C of the first evaporator 70, and the steam reaches the steam outlet at the upper part of the lower chamber 90C.

  7 is a saturated water outlet pipe, 7B is an automatic on-off valve, and 7C is an orifice. 91 is a condensate water pipe, which sends condensate by heat exchange to the condensate inlet of the first condenser 30, and 91A is an orifice. A steam pipe 93 sends pure steam to the first condenser 30 through the steam separator 95. The fine water droplets removed by the steam separator 95 merge into the saturated water outlet pipe 7 via the steam trap 96A and the check valve 96B. The steam generated in the third evaporator 90 flows into the first condenser 30 via the steam separator 95.

  Reference numeral 4 denotes a distilled water outlet pipe connected to the distilled water outlet at the lower part of the second condenser 40 to guide distilled water to the outside. The distilled water outlet pipe 4 is partially U-shaped. 4C is a water quality sensor interposed in the distilled water outlet pipe 4, and the conductivity of distilled water can be measured. 4B is a temperature sensor that is electrically connected to a temperature controller attached to the distilled water outlet pipe 4, and is set to a set temperature of 95 to 105 ° C., for example, and is connected to the second condenser 40. Eight proportional control valves 8C are electrically linked to operate when the temperature of distilled water in the distilled water outlet pipe 4 exceeds a predetermined temperature to control the inflow amount of cooling water. 4D is an automatic opening / closing valve interposed in the distilled water outlet pipe 4, 5 is a waste distilled water outlet pipe branched at an upstream position of the automatic opening / closing valve 4D of the distilled water outlet pipe 4, and is a water quality sensor. When the measurement result of 4C is equal to or higher than the set water quality value, the automatic opening / closing valve 4D of the distilled water outlet pipe 4 is opened, the automatic opening / closing valve 5B of the waste distilled water outlet pipe 5 is closed, and the distilled water is discharged from the distilled water outlet. It is discharged from the pipe 4. If the measurement result of the water quality sensor 4C is below the set water quality value, the on-off valve 4D of the distilled water outlet pipe 4 is closed, the on-off valve 5B of the waste distilled water outlet pipe 5 is opened, and distilled water that does not meet the water quality standard Is discharged from the waste distilled water outlet pipe 5.

  As mentioned above, although the apparatus of this invention was demonstrated based on drawing about the case where each is equipped with three evaporators and a steam-water separator, it is the same also in the case where there are more evaporators and steam-water separators, for example, 4-7. is there.

1 Supply water inlet piping 2 Heating steam inlet piping 3 Steam drain outlet piping 4 Distilled water outlet piping 5 Waste distilled water outlet piping 6 Non-condensable gas outlet piping 7 Saturated water outlet piping 8 Cooling water inlet piping 9 Cooling water outlet piping 15 External air inlet pipe 30 1st capacitor 40 2nd capacitor 50 Waste heat recovery device 60 Preheater 70 1st evaporation can 80 2nd evaporation can 90 3rd evaporation can 70K Spiral blade 70N, 75L Spiral fin 70P Liquid collection member 70Q Disc-shaped member 70R U-shaped member 70S Conical member 70T Ring-shaped member 75, 85, 95 Air-water separator

Claims (3)

  Supply water preheating means, a plurality of evaporators that sequentially generate an air / water mixture from the preheated supply water, an air / water separation means for the generated air / water mixture, and air / water separated pure steam as supply water and In a multi-effect can-type distilled water production apparatus comprising a condenser that is cooled with cooling water to form distilled water, and an outside air introduction means connected to the condenser, a steam-water separation mechanism is provided in the lower chamber of each evaporator. The air / water separation mechanism includes a spiral fin provided between the outer cylinder of the lower chamber and the inner cylinder inserted in the central portion of the lower chamber, and the air / water mixture is provided by the air / water separation mechanism. A multi-effect can-type distilled water production apparatus characterized in that a pure steam is separated from the gas-water mixture by applying a centrifugal force.   A steam separator is connected to the downstream side of each evaporator, and the steam separator is provided with a steam separator. The steam separator is separated from the outer cylinder of the steam separator. A spiral fin provided between the inner cylinder of the closed end inserted in the center of the vessel, and the pure steam containing fine water droplets is subjected to centrifugal force by such a steam-water separation mechanism. The multi-effect can type distilled water producing apparatus according to claim 1, wherein the fine water droplets are separated from the water.   A deaeration mechanism is provided in the upper chamber of the first evaporator, and the deaeration mechanism as a whole has a generally flat conical member in the upper stage and has an inclined surface that descends toward the center as a whole. The multi-effect can type distilled water production apparatus according to claim 1, wherein the feed water is degassed by the degassing mechanism.

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