JPS6324428B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in an apparatus for producing high-purity distilled water or pure steam used in the pharmaceutical industry and the like.

(Prior Art) In this type of apparatus, it is common to evaporate high purity water such as deionized water using an evaporator called a falling film type.

However, conventional devices have problems in that depending on the state or amount of deionized water supplied to the evaporator, the liquid film in the evaporator may break or the liquid film may be too thick, reducing the thermal efficiency of the evaporator.

(Object of the Invention) An object of the present invention is to provide an apparatus for producing high-purity distilled water or pure steam that can maintain the state of a liquid film appropriately and improve the thermal efficiency of an evaporator.

(Structure of the Invention) The present invention provides a heater for boiling high-purity water in the middle of a pipe that supplies high-purity water to a liquid film falling type evaporator. This is an apparatus for producing high-purity distilled water or pure steam, which is characterized by supplying a mixed state of water, droplets, and liquid to an evaporator.

(Example) In FIG. 1 showing the case where the present invention is applied to a pure steam production apparatus, 10 is a droplet-flow type evaporator. Inside the evaporator 10, which is vertically formed and installed vertically, there are heat transfer tubes 1 fixed with two tube plates 12.
4, the upper part of the heat exchanger tube 14 is an upper chamber 16, and the lower part is a lower chamber 18.

A main pipe 20 is connected to the upper chamber 16 of the evaporator 10, and high-purity water such as deionized water flows through the main pipe 20. The main pipe 20 includes an automatic valve 22, a preheater 24, and a heater 2 from the upstream side.
6 etc. are successively interposed, deionized water preheated by the preheater 24 is boiled by the heater 26,
Deionized water is evaporated into the evaporator 10 by the rising power of the generated steam.
It has the function of supplying

A vapor outlet pipe 28 is provided in the lower chamber 18 of the evaporator 10, and the vapor outlet pipe 28 is connected to a separator 30 for separating vapor and liquid droplets. Separator 3
A pressure switch 34 is provided in the steam outlet pipe 32 of the steam outlet 32, and the steam outlet pipe 32 is adapted to supply pure steam to, for example, pharmaceutical manufacturing equipment.
Further, a blow pipe 36 is connected to the lower chamber 18, and deionized water accumulated in the lower chamber 18 is transferred to the lower chamber 18.
It has the function of discharging to the outside. The blow pipe 36 is branched into a branch pipe 38 and a branch pipe 40.
8 is the main pipe 2 between the preheater 24 and the heater 26
0, and deionized water is circulated through the branch pipe 38 by the rising force of the steam generated by the heater 26 to the evaporator 10.
is supplied to The branch pipe 40 is opened to discharge a portion of the deionized water via an orifice 42 and an automatic valve 44. A drain pipe 46 of the separator 30 is connected to the middle of the blow pipe 36 .

These evaporator 10, preheater 24, heater 2
The heat source of No. 6 is a main steam pipe 50 having an opening adjustment valve 48.
The main steam pipe 50 is branched into a branch pipe 52 and a branch pipe 54, which are connected to the evaporator 10 and the heater 26, respectively. The evaporator 10 is provided with a steam drain pipe 56 for discharging steam drain after heating the heat transfer tube 14. The steam drain pipe 56 is connected to the preheater 24 via a steam trap 58, and is discharged from the preheater 24. After the heat is recovered, it is discharged from the steam drain pipe 60. A drain pipe 62 of the heater 26 is connected to a portion of the steam drain pipe 56 upstream of the steam trap 58.

The blow pipe 36 is provided with a level switch 64, which opens and closes the automatic valve 22 and the automatic valve 44 in response to a signal from the level switch 64 to keep the water level in the heater 26 constant and prevent impurities in the deionized water from concentrating. It has a function to control the amount of deionized water supplied and the amount of blowing.

Next, the action will be explained. When deionized water boils in the heater 26, a bumping phenomenon occurs, and this bumping phenomenon increases the pressure inside the heater 26, causing the heater 26 to boil.
The deionized water is mixed with steam, droplets, and liquid due to the rising force of the steam, and is forced into the upper chamber 16 of the evaporator 10 through the main pipe 20. Therefore, the heater 26 also functions as a pump, and no special pump is required.

When deionized water in a mixed state of steam, droplets, and liquid is pumped into the upper chamber 16, the volume expands rapidly in the upper chamber 16, causing a so-called flushing phenomenon, and the liquid becomes droplets, and the droplets become fine particles. It is atomized into particles and adheres to the inner surface of the heat transfer tube 14 of the evaporator 10, forming a thin liquid film that is easily evaporated. The steam from the heater 26 and the steam generated in the heat transfer tube 14 flow from the lower chamber 18 through the steam outlet tube 28 into the separator 30 .
At 0, further droplets are removed and pure vapor is supplied through the vapor outlet pipe 32 to the pharmaceutical manufacturing equipment.

The amount of deionized water supplied to the evaporator 10 is appropriately controlled by opening and closing the automatic valves 22 and 44, which are controlled by the level switch 64, to appropriately control the amount of deionized water pumped into the heater 26.

Adjustment of the heat source heating steam is controlled by a pressure switch 34. Even if the amount of steam used from the steam outlet pipe 32 changes, the required amount is supplied by adjusting the opening degree of the opening adjustment valve 48 so that the pressure is constant using the pressure switch 34.

(Effects of the Invention) As described above, the pure steam production apparatus of the present invention includes a heater 26 that boils high-purity water in the middle of the main pipe 20 that supplies high-purity water to the liquid film falling type evaporator 10. Since the high purity water is supplied to the evaporator 10 in a mixed state of steam, droplets and liquid by the rising force of the generated steam, the heat exchanger tube 1 of the evaporator 10
4 Deionized water atomized by the flushing phenomenon adheres to the inner surface as a thin liquid film that easily evaporates, and the steam generated by the heater 26 and the steam generated by flushing reduce the steam flow rate in the heat transfer tube 14. As the Reynolds number increases due to the rise, deionized water is easily evaporated with a small amount of heat, and the thermal efficiency of the evaporator 10 can be improved. Therefore, the cost required to produce pure steam can be significantly reduced.

In addition, the improved thermal efficiency allows the evaporator 10 to be made smaller, and the state of the generated steam improves, reducing the number of droplets in the steam flowing from the evaporator 10 into the separator 30. A simple device is sufficient, and the cost and installation space of the entire device can be reduced.

(Another Example) A case in which the present invention is applied to an apparatus for producing high-purity distilled water will be described with reference to FIG. In FIG. 2, parts indicated by the same reference numerals as those in FIG. 1 are the same or equivalent parts.

In Fig. 2, 70 is a condenser, and the main pipe 20
is connected to the preheater 24 through a capacitor 70. Deionized water from the preheater 24 passes through the first stage heater 26a and is then transferred to the first stage evaporator 10a.
From the first stage evaporator 10a to the second stage heater 26b
to the second stage evaporator 10b, the second stage evaporator 10
b, the third stage heater 10c and the third stage evaporator 1
0c. The steam generated in the first stage evaporator 10a is transferred to the second stage heater 26b and the second stage evaporator 1.
0b and the condensed water is the third stage heater 26c.
The signal is sent to the capacitor 70 via the . The steam generated in the second stage evaporator 10b becomes a heating source for the third stage heater 26c and the third stage evaporator 10c, and the condensed water is sent to the condenser 70 together with the second stage condensed water. The steam generated by the second stage evaporator 10cde is supplied from the condenser outlet pipe 74 to the pharmaceutical manufacturing equipment.

Note that the evaporator 10 is not limited to three stages, and the number of stages may be increased or decreased.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of an apparatus for producing pure steam to which the present invention is applied, and FIG. 2 is a schematic structural diagram of an apparatus for producing high-purity distilled water to which the present invention is applied. DESCRIPTION OF SYMBOLS 10... Evaporator, 20... Main piping, 24... Preheater, 26... Heater, 30... Separator, 36... Blow piping.

Claims (1)

[Claims] 1 A heater that boils high-purity water is installed in the middle of the piping that supplies high-purity water to a liquid film falling type evaporator, and the high-purity water is heated to a mixed state of steam, droplets, and liquid by the rising force of the generated steam. An apparatus for producing high-purity distilled water or pure steam, which is supplied to an evaporator.