JPS61254286A - Small-sized apparatus for generating pure steam or high purity distilled water - Google Patents

Abstract

PURPOSE:To supply high purity distilled water wtihin a short time, by providing two stages or more of cylindrical evaporation boilers each having a vertical heater housed therein and storing high purity water in a connected state. CONSTITUTION:The deionized water 18 supplied from a water feed pipe 10 is heated by the electric heater 16a of a first state evaporation boiler 12 to be flowed into a second stage evaporation boiler 14 and further heated by the electric heater 16b of the second stage evaporation boiler 14 and evaporated to generate pure steam 32. This pure steam 32 enters a gas-liquid separator 34 to remove liquid droplets and passes through a steam outlet pipe 36 to be supplied to facilities using the pure steam 32. The pressure of the pure steam 32 is held to predetermined value by indivisually performing the ON/OFF or proportional control of the electric heaters 16a, 16b by a pressure regulator 35a. By this method, a container can be miniaturized and it is unnecessary to undergo inspection for strength as a pressure vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a small-sized production apparatus for pure steam or high-purity distilled water suitable for relatively small-scale facilities such as research institutes.

(Prior art and its problems) In this type of conventional apparatus, for example, deionized water is stored in a relatively large evaporator and heated with a heater to evaporate the deionized water.

However, in such conventional equipment, it is necessary to store high-pressure steam (approximately 2 kg/cd) in a large evaporator, and in order to maintain the safety of the evaporator, the evaporator must be made sturdy. Furthermore, it must be certified as a pressure vessel.

Also, it takes a long time to evaporate a large amount of deionized water by heating it with a heater, and a relatively small amount of pure steam or BI11
Another problem is that it is unsuitable for small-scale facilities such as research institutes that require once-distilled water for a short period of time.

(Objective of the Invention) An object of the present invention is to provide a small-sized production apparatus for pure steam or high-purity distilled water that can supply a relatively small amount of pure steam or high-purity distilled water in a short time.

(Structure of the Invention) (1) Technical Means The present invention provides at least two or more connected cylindrical evaporators that house vertical heaters and store high-purity water, and generate pure steam. This is a small-sized apparatus for producing pure steam or high-purity distilled water, characterized in that a control means is provided for individually controlling the heaters so as to maintain a constant state.

(2) Function Since a plurality of relatively small evaporators are connected and provided, steam is generated in a short time. Further, the plurality of heaters are individually controlled by the control means.

(Example) A first example of the present invention, that is, a small-sized pure steam production apparatus will be described with reference to FIG.

Reference numeral 10 denotes a water supply pipe, through which raw water, ie, high purity water such as deionized water, is supplied. An electric valve 11a1 adjustment valve 11 is installed in the middle of the water supply pipe 10.
b1 check valves 11C are sequentially installed.

The water supply pipe 10 is connected to the lower end of the first stage evaporator 12 . The first stage evaporator 12 has a substantially cylindrical shape with a bent upper end, and is continuous with the side surface of the second stage evaporator 14 . A vertical electric heater 16a is inserted from the lower end of the first stage evaporator 12, and the first stage evaporator 12 is set to have a volume that stores a relatively small amount of deionized water 18 around the electric heater 16a. .

Similarly, the electric heater 16b of the second stage evaporator 14 is heated from the lower end.
is inserted, and the volume is set to store a relatively small amount of deionized water 18. In addition, electric heaters 16a and 16b
For example, the capacity is about 6KW.

A bypass pipe 20 communicates between the upper part of the second stage evaporator 14 and the middle part of the first stage evaporator 12.
Natural convection due to the temperature difference causes deionized water 18 to flow in the direction of the arrow. A branch pipe 21a is provided in the middle of the bypass pipe 20. In addition, the second stage evaporator 1
A bypass pipe 22 communicates between the bottom of the evaporator 4 and the middle part of the first stage evaporator 12, and the natural convection of the bypass pipe 22 is designed to prevent liquid pooling from occurring in the portion X.

One end of a blow piping 24 is connected to the bottom of the first stage evaporator 12, and the other end of the blow piping 24 is opened to blow a part of the accumulated deionized water 18 to the outside. ing. A blow valve 25a is installed in the middle of the blow pipe 24.
, check valves 25b are successively installed. Check valve 25b
An auxiliary blow pipe 26 is provided between the downstream blow pipe 24 and the bypass pipe 20, and the auxiliary blow pipe 26 includes a check valve 27a1, an adjustment valve 27b1, a blow valve 27C
are interposed in sequence.

A level switch 28 (control means) for adjusting the water level of the second stage evaporator 14 between a high level H and a low level L is provided in the middle of the bypass pipe 2o. From the output part 29a of the level switch 28, an opening/closing control signal 29b is transmitted to the electric valve 11a, and an opening/closing control signal 29c is transmitted to the blow valve 27C. When the electric valve 11a is open, the blow valve 27c is transmitted. This structure prevents impurities in the deionized water 18 from concentrating by opening the valve and blowing about 10% of the deionized water 18 supplied from the water supply pipe 10 from the auxiliary blow pipe 26.

Further, a heater control signal 29d is transmitted from the output section 29a, and the output section 29a controls the electric heaters 16a and 16b.

One end of a steam pipe 30 is connected to the top of the second stage evaporator 14 , and the other end of the steam pipe 30 communicates with a gas-liquid separator 34 . Pure steam 32 generated in the second stage evaporator 14 is supplied to a gas-liquid separator 34 through a steam pipe 30. The pure steam from which liquid droplets have been removed in the gas-liquid separator 34 is supplied from a steam outlet pipe 36 to facilities that use the pure steam.

The gas-liquid separator 34 is equipped with a pressure regulator 35a (control means) and a thermometer 35b, and the electric heaters 16a, 16 are controlled by a heater/control signal 35c from the pressure regulator 35a.
b individually ON, OFF or proportionally controlled to control the steam outlet pipe 3.
The pressure of the pure steam 32 of No. 6 is controlled to, for example, 1.5 Kf/-.

Next, the effect will be explained. Deionized water 18 supplied from the water supply pipe 10 is first supplied to the electric heater 16 of the first stage evaporator 12.
After being heated by a, it flows into the second stage evaporator 14, is further heated by the electric heater 16b of the second stage evaporator 14, and evaporates, becoming pure steam 32. This pure steam 32 is subjected to droplet removal in a gas-liquid separator 34 and is then supplied through a steam outlet pipe 36 to a facility that uses the pure steam 32. Since the deionized water 18 stored in the first-stage evaporator 12 and the second-stage evaporator 14 is relatively small, even when low-temperature deionized water 18 is supplied, the deionized water 18 can be regenerated in a short time. Boil to generate pure steam 32.

At this time, the pressure of the pure steam 32 is adjusted by turning on the electric heaters 16a and 16b individually using the pressure regulator 35a.

By turning it off or proportionally controlling it, it is maintained at a predetermined pressure, that is, about 1.5 Kjl/7.

The water level in the second stage evaporator 14 is maintained between high level H and low level L by the level switch 28, and the output section 29a opens and closes the electric valve 11a of the water supply pipe 10 and the blow valve 27G of the auxiliary blow pipe 26. The control prevents impurities in the deionized water 18 stored in the second-stage evaporator 14 and the first-stage evaporator 12 from concentrating.

Furthermore, due to the natural convection action of the bypass pipe 20, bypass pipe 22, etc., the inside of the first stage evaporator 12, the second stage evaporator 14,
In particular, there is no possibility of liquid pooling occurring in the portion X, etc., and the temperature of the deionized water 18 becomes uniform.

Next, referring to FIG. 2, an apparatus for producing high-purity distilled water, which is a second embodiment of the present invention, will be described. In addition, in Figure 2,
Parts with the same reference numerals as in Figure 1 indicate the same or equivalent parts.

In FIG. 2, the downstream end of the steam outlet pipe 36 is connected to a condenser 40. The condenser 40 has a cooling pipe 4
2 is accommodated, and the cooling water is cooled from a cooling water intake 43a and is made to flow through an outlet 43b.

A distilled water outlet pipe 44 is provided at the lower end of the condenser 40, and pure distilled water is supplied to the outside from the end of the distilled water outlet pipe 44.

Further, FIGS. 3 to 5 show the external appearance of the device shown in FIG. 2 when it is actually manufactured into a product. 50 is instruments, 52 is an operation panel, and 54 is a flow meter.

(Effects of the Invention) As explained above, the small-sized production apparatus for pure steam or high-purity distilled water according to the present invention has at least two stages of a cylindrical evaporator that houses a vertical heater and stores high-purity water. Since the heaters are connected and provided with a control means for individually controlling the heaters so as to maintain a constant state of the generated pure steam, the following effects are achieved.

First, since the first stage evaporator 12 and the second stage evaporator 14 are relatively small, the first stage evaporator 12 and the second stage evaporator The strength of the can 14 is improved, and since the volume is small, there is no need to undergo strength verification as a pressure vessel.

Moreover, since the amount of deionized water 18 stored in the first stage evaporator 12 and the second stage evaporator 14 is relatively small, even when low-temperature deionized water 18 is supplied, the deionized water 18 can be used in a short time. can be boiled to generate pure steam 32, and is suitable for small-scale facilities such as research institutes that require pure steam 32 in a short time.

Furthermore, since the electric heaters 16a and 16b are individually controlled by the steam outlet pipe 36C from the pressure regulator 35a, the pressure of the pure steam 32 supplied from the steam outlet pipe 36 can be adjusted to 1, for example.
．． It is possible to maintain an appropriate pressure of about 5 Nff/ci.

(Another embodiment) (1) The present invention is not limited to the above-mentioned embodiments. For example, a heat exchanger such as a multi-effect can is provided in the middle of the steam pipe 30, and the thermal efficiency of the entire device is greatly increased as an effect can system. It can also be improved.

(2) The evaporator is not limited to two stages, such as the first stage evaporator 12 and the second stage evaporator 14, but may be any number of stages, including at least two or more stages.

[Brief explanation of the drawing]

Claims (1)

[Claims] At least two or more stages of cylindrical evaporators containing vertical heaters and storing high-purity water are provided in a connected manner, and the heaters are individually controlled to maintain a constant state of the pure steam generated. A small-sized production device for pure steam or high-purity distilled water, characterized in that it is equipped with a control means.