JPS6352954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an improvement in a high-purity distilled water supply device that supplies high-purity distilled water from a high-purity distilled water production device to a user facility.

(Prior art and its problems) In conventional devices of this type, high-purity distilled water stored in a tank is constantly circulated within the main piping to prevent the growth of bacteria inside the device. There is.

However, there is a cooling mechanism in the middle of the main piping that cools the high-purity distilled water stored at high temperature to an appropriate temperature. There is a problem in that even circulating high-purity distilled water that does not need to be heated is cooled, and the energy required for cooling and reheating is wasted.

(Objective of the Invention) An object of the present invention is to provide a high-purity distilled water supply device that can eliminate the above-mentioned waste of energy and prevent the growth of bacteria inside the device.

(Structure of the Invention) (1) Technical Means The present invention provides a tank for storing high-purity distilled water produced by a high-purity distilled water production device at a high temperature that prevents the growth of bacteria, and a high-purity distilled water stored in the tank. In a high-purity distilled water supply system that has a main pipe that pressure-feeds purified water to the facility where it is used and a cooling mechanism that cools the high-purity water in the main pipe, high-purity distilled water is circulated from the distilled water outlet of the main pipe to a tank. A reflux pipe is installed, and a throttling mechanism is installed to reduce the flow rate of the reflux pipe to a low enough flow rate to prevent the growth of bacteria inside the high-purity distilled water supply device. This is a high-purity distilled water supply device characterized by providing a bypass pipe for circulating high-purity distilled water from the main pipe between the tank and the cooling mechanism to the tank.

(2) Effect The flow rate of high-purity distilled water flowing through the circulation piping is restricted by the throttling mechanism to a low enough flow rate to prevent the growth of bacteria, reducing the energy required for circulating high-purity distilled water, and Excess high-purity distilled water is returned to the tank via bypass piping without passing through the cooling mechanism.

(Example) In FIG. 1 showing a pure steam production apparatus equipped with a high-purity distilled water supply apparatus according to the present invention, M is a production apparatus and F is a high-purity distilled water supply apparatus. In the figure, 10 is a droplet-flowing type evaporator. A heat exchanger tube 14 fixed by two tube plates 12 is provided in the vertically elongated evaporator 10, and the upper part of the heat exchanger tube 14 is an upper chamber 16, and the lower part is a lower chamber 18. It is becoming.

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. An automatic valve 22, a first preheater 24a, a second preheater 24b, a heater 26, etc. are sequentially installed in the main pipe 20 from the upstream side, and the deionized water preheated by both preheaters 24a and 24b is heated. It has the function of supplying deionized water to the evaporator 10 by boiling it in the vessel 26 and using the rising power of the generated steam.

A bent pipe 28 is provided in the lower chamber 18 of the evaporator 10, and the bent pipe 28 is connected to a gas-liquid separator 30 that separates vapor and liquid droplets. Gas-liquid separator 3
A pressure indicating controller 34b is provided at the upper part of the autoclave 3, and the steam outlet pipe 32 is connected to the autoclave 3, for example.
It is designed to supply pure steam to the 3rd class.

In addition, a blow pipe 36 is provided at the bottom of the gas-liquid separator 30.
is connected to the gas-liquid separator 30, and has a function of discharging deionized water accumulated in the gas-liquid separator 30 to the outside. The blow pipe 36 branches into a branch pipe 38 and a branch pipe 40,
The branch pipe 38 connects the second preheater 24b and the heater 26.
Deionized water is circulated through a branch pipe 38 and supplied to the evaporator 10 by the upward force of the steam generated by the heater 26 . Branch pipe 40 is connected to piping 41. The blow pipe 36 is connected to the pipe 41 via an orifice 42, an automatic valve 44, and the like.

These evaporator 10, both preheaters 24a, 2
4b, the heat source of the heater 26 is supplied from the main steam pipe 50 having the opening adjustment valve 48 by adjusting the opening of the opening adjustment valve 48 using the signal from the pressure indicating controller 34b. It is connected to the evaporator 10 via the evaporator 10.

The evaporator 10 is provided with a steam drain pipe 56 for discharging steam drain after heating the heat transfer tube 14, and after passing through the heater 26, the steam drain pipe 56 is connected to both preheaters 24a via a steam trap 58. , 24b, both preheaters 2
After the waste heat is recovered at 4a and 24b, it is discharged from the steam drain pipe 60.

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.

In the middle of the steam outlet pipe 32, there is a surplus steam extraction pipe 7.
0 is connected to the surplus steam extraction pipe 7.
0 is connected to a first condenser 72a that condenses pure steam to produce high-purity distilled water via a third preheater 71a, a second evaporator 71b, a third evaporator 71c, etc. Second evaporator 71
b, the third evaporator 71c is equipped with a second gas-liquid separator 71d and a third gas-liquid separator 71e, respectively.

A deionized water inlet pipe 78 and a deionized water outlet pipe 80 are connected to the first condenser 72a.
The deionized water inlet pipe 78 is configured to be preheated by flowing low-temperature deionized water from the main pipe 20. The deionized water outlet pipe 80 communicates with the bottom of the second evaporator 71b. A breather mechanism 82 is provided in the first condenser 72a, and the breather mechanism 82 includes a check valve 83a and a sterilization filter 8.
3b etc.

A second condenser 72b is provided downstream of the first condenser 72a, and the second condenser 72b has a cooling water inlet pipe 84 and a cooling water outlet pipe 8.
6 is connected. This second capacitor 72b
A three-way valve 90 is interposed in the distilled water outlet pipe 88, and high-purity distilled water is made to flow from the three-way valve 90 to the high-purity distilled water supply device F through a pipe 92.

The high purity distilled water supply device F will be explained with reference to FIG. The piping 92 (FIG. 1) is connected to a distilled water tank 100. A jacket 102 is provided at the bottom of the distilled water tank 100, and the jacket 102 heats the high purity distilled water 104 stored in the distilled water tank 100 to a high temperature of 80°C to 85°C, which is a high temperature that does not allow bacteria to grow. It has a structure that allows

A steam pipe 108 having a temperature control valve 106 is connected to the jacket 102.
08 is connected to the main steam pipe 50 (FIG. 1).
110 is a drain pipe, and the drain pipe 110 is the drain pipe 60 (first
(Figure).

A breather mechanism 82 similar to the first condenser 72a is provided at the top of the distilled water tank 100. Further, one end of a main pipe 112 is connected to the bottom of the distilled water tank 100, and high-purity distilled water 104 is fed under pressure from the main pipe 112. The main pipe 112 includes a pump 114 from the upstream side,
Flow meter 116, first cooler 118, second cooler 1
20 (first and second cooling mechanisms) etc., and a distilled water outlet 1 is installed at the downstream end of the main pipe 112.
22 is formed. Both coolers 118, 120
For example, high purity distilled water stored at high temperature is
It cools to an appropriate temperature between ℃ and 45℃.

High-purity distilled water 104 is supplied from the distilled water outlet 122 to equipment for manufacturing pharmaceutical products such as injections, but the consumption of high-purity distilled water 104 in the equipment for manufacturing pharmaceuticals is intermittent, and the high-purity distilled water 104 does not flow. If water stagnates, bacteria tend to grow, so a reflux pipe 124 is provided to reflux a portion of the high-purity distilled water 104 to the distilled water tank 100.

The reflux pipe 124 passes through the 'th cooler 118,
An orifice 126 (throttling mechanism) is provided between the first cooler 118 and the distilled water tank 100. The throttling ratio of the orifice 126 is set to restrict the flow rate of the reflux pipe 124 to a minimum amount that can prevent the growth of bacteria, for example, about 10% of the flow rate of the main pipe 112. A pressure gauge 128 is interposed in the reflux pipe 124 upstream of the first cooler 118 .

Main piping 11 between pump 114 and flow meter 116
One end of the bypass pipe 130 is connected to the bypass pipe 1, and the other end of the bypass pipe 130 is connected to the bypass pipe 1.
The other end of 30 is connected to the distilled water tank 100, and a circulation pipe 124 downstream of the orifice 126 is connected to the bypass pipe 130 downstream of the regulating valve 132. A regulating valve 132 is interposed in the middle of the bypass pipe 130, and the opening degree of the regulating valve 132 is adjusted by the transmitter 129 of the pressure gauge 128. More specifically, the amount of surplus water returned to the distilled water tank 100 via the bypass pipe 130 is preferably controlled so that it decreases as the amount used at the distilled water outlet 122 increases, and increases as the amount used decreases. Therefore, if the amount of distilled water used at the outlet 122 increases, the pressure in the circulation piping 124 decreases, so the pressure in the circulation piping 124 is measured with a pressure gauge 128, and a transmitter 129 linked to the pressure gauge 128 is used. In the manufacturing process, the regulating valve 132 is controlled so that the opening degree of the regulating valve 132 is increased when the amount of distilled water used at the distilled water outlet 122 decreases. Note that 134 is a level switch, and 135 is a transmitter.

Next, the effect 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, liquid 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 is dripped down, and the droplets become fine particles. The liquid is atomized and adheres to the inner surface of the heat transfer tube 14 of the evaporator 10, forming a thin liquid film that is easily emitted. The steam from the heater 26 and the steam generated in the heat transfer tube 14 flow from the lower chamber 18 through the bent tube 28 into the gas-liquid separator 30, where droplets are further removed and pure steam is produced. The steam is then supplied from the steam outlet pipe 32 to the autoclave 33.

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 indicating regulator 34b. 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 indicating regulator 34b maintains a constant pressure.

Excess steam is condensed in the first condenser 72a and the second condenser 72b to produce high-purity distilled water.

High-purity distilled water 104 stored at high temperature in the distilled water tank 100 is supplied to a first cooler 118 and a second cooler 118.
The distilled water cooled to a droplet temperature of, for example, about 40°C by the cooler 120 is supplied to facilities such as pharmaceutical manufacturing equipment from the distilled water outlet 122, but when the high-purity distilled water 104 is not consumed, about 10% of the water is removed from the reflux pipe 124. High purity distilled water 104 flows back into distilled water tank 100.

Therefore, bacterial growth inside the high-purity distilled water supply device 6 is prevented, and the energy required for cooling in the second cooler 120 is saved.

Moreover, the pressure inside the main pipe 112 is lower than that in the reflux pipe 124.
Since the high purity distilled water 104 is maintained by the circulating flow, high purity distilled water 104 is immediately pumped from the main pipe 112 when necessary.

Further, the refrigerant of the first cooler 118 is supplied to the reflux pipe 124.
Since the high-purity distilled water 104 flows through the water, the first cooler 118 recovers the exhaust heat.

Furthermore, surplus high-purity distilled water 10 in the main pipe 112
4 from the bypass pipe 130 to the first cooler 118;
Distilled water tank 10 without passing through second cooler 120
Since it is bypassed to 0, the energy saving effect is even greater.

(Effects of the Invention) As explained above, the high-purity distilled water supply device of the present invention has a tank that stores high-purity distilled water produced by the high-purity distilled water production device at a high temperature that prevents the growth of bacteria. , in a high-purity distilled water supply system that has a main pipe that pumps high-purity water stored in a tank to a usage facility and a cooling mechanism that cools the high-purity water in the main pipe, high-purity distilled water is supplied from the distilled water outlet of the main pipe. A reflux pipe is installed to circulate distilled water to the tank, and a throttling mechanism is installed to reduce the flow rate of the reflux pipe to a low enough flow rate to prevent the growth of bacteria inside the high-purity distilled water supply device. A bypass pipe is provided to circulate excess high-purity distilled water maintained at pressure and circulated from the main pipe between the tank and the cooling mechanism to the tank, resulting in the following effects.

Even when the high-purity distilled water 104 is not consumed from the distilled water outlet 122, the high-purity distilled water 10 is squeezed to the minimum required amount by the orifice 126 from the reflux pipe 124.
4 flows back into the distilled water tank 100, the energy required for cooling in the second cooler 120 can be significantly reduced while the growth of bacteria is prevented.

Further, the excess high-purity distilled water 104 flowing through the main pipe 112 can be bypassed from the bypass pipe 130 to the distilled water tank 100 without passing through the first cooler 118 and the second cooler 120, thereby improving the operation of the entire device. The energy required for this can be further reduced.

Moreover, the pressure inside the main pipe 112 is lower than that in the reflux pipe 124.
Since the high purity distilled water 104 is maintained by the circulating flow, the high purity distilled water 104 can be immediately pumped from the main pipe 112 if necessary. In particular, in the present invention, water-cooled first and second coolers 120 (first and second cooling mechanisms) are provided at two locations in the middle of the main pipe 112, and high-purity distilled water 104 is supplied from the distilled water outlet of the main pipe 112. A reflux pipe 124 is provided to circulate distilled water 104 in the tank 100 and to flow the distilled water 104 taken out from the distilled water outlet 122 to the first cooler 118 as a refrigerant in the first cooler 118 near the tank 100. A first cooler 11 through which high-temperature distilled water 104 flows near the
By using the low-temperature distilled water 104 flowing through the reflux pipe 124 as the refrigerant in step 8, waste heat from the first cooler 118 can be recovered into the distilled water tank 100 using this distilled water 104, resulting in a large energy-saving effect.

Furthermore, a circulation pipe 12 is installed in the middle of the bypass pipe 130.
A regulating valve 132 is provided to adjust the flow rate of the bypass piping 130 so as to increase the flow rate as the amount of distilled water consumed at the distilled water outlet 122 decreases according to the pressure of the distilled water outlet 122. Since the downstream end of the circulation piping 124 is connected to the downstream part, the pressure in the reflux piping 124, which changes depending on the increase or decrease in the amount of distilled water used at the distilled water outlet 122, is measured with the pressure gauge 128. The regulating valve 132 can be controlled by the signal from the transmitter 129, the flow rate of the bypass pipe 130 can be maintained at an appropriate level, the pressure of the main pipe 112 can be kept approximately constant, and the distilled water outlet can be quickly closed if necessary. Distilled water 104 can be supplied from 122 .

The reflux pipe 124 is connected to the bypass pipe 130 downstream of the regulating valve 132, and the orifice 126 is provided downstream of the first cooler 118, so the influence of the orifice 126 does not affect the pressure gauge 128. High measurement accuracy.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram showing an apparatus for producing high-purity distilled water, and FIG. 2 is a schematic structural diagram showing a high-purity water supply apparatus according to the present invention. M...Pure distilled water production equipment,
F...High purity distilled water supply device, 90...3-way valve,
100... Distilled water tank, 120... Jacket, 112... Main piping, 114... Pump, 11
8...First cooler, 120...Second cooler, 12
2... Distilled water outlet, 124... Reflux piping, 126
... Orifice, 130 ... Bypass piping, 13
2...Adjustment valve.

Claims (1)

[Claims] 1 A tank that stores the high-purity distilled water produced by the high-purity distilled water production equipment at a high temperature that prevents the growth of bacteria, a main pipe that pumps the high-purity water stored in the tank to the facility where it will be used, and In a high-purity distilled water supply device that has a cooling mechanism that cools high-purity water in piping, first and second water-cooled cooling mechanisms are installed at two locations in the middle of the main piping, and high-purity distilled water is supplied from the distilled water outlet of the main piping. Distilled water is circulated through the tank, and a reflux piping is provided to flow the distilled water taken out from the distilled water outlet to the first cooling mechanism as a refrigerant of the first cooling mechanism near the tank, and the flow rate of this reflux piping is adjusted to match the flow rate of high-purity distilled water. A throttling mechanism that restricts the flow rate to a low enough level to prevent the growth of bacteria inside the supply device is provided in the circulation piping downstream of the first cooling mechanism, and the main piping is circulated so as to maintain the main piping at a constant pressure. By-pass piping is provided to circulate excess high-purity distilled water from the main piping between the tank and the first cooling mechanism to the tank, and a pressure gauge is provided at the upstream side of the first cooling mechanism in the reflux piping, and this bypass A regulating valve is installed in the middle of the piping to adjust the flow rate of the bypass piping so that the flow rate increases as the amount of distilled water consumed at the distilled water outlet decreases according to the pressure of the circulation piping. A high-purity distilled water supply device, characterized in that a downstream end of the circulation pipe is connected to a side portion.