JPH05280701A - Reboiler - Google Patents

Abstract

PURPOSE:To obtain pure steam having a high purity by a method wherein the top of a U-tube is held above the vapor-liquid interface, and a discharge valve which is opened when a specified amount of foul water gathers in a discharge pipe is installed on the downstream side of a venturi of the discharge pipe. CONSTITUTION:A vertical pipe 29 is laid outside a vessel 21 and parallel with a shell 22 of the vessel 21 and a venturi 30 is mounted on the lower part of the vertical pipe 29. A discharge nozzle 31 is located at the center of the vessel 21 and connected to the top end of a discharge pipe 28, so that upper part foul water containing contaminants (a) floating on the vapor-liquid interface around the discharge nozzle 31 flows down into the discharge pipe 28. A discharge valve 32 is mounted on time further downstream side of the venturi 30 of the discharge pipe 28 and is brought in action when the upper part foul water gathers in the discharge pipe 28 by a specified amount. Thereby, contaminants floating on the vapor-liquid interface can be certainly removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reboiler, and more specifically, it blows live steam into a container to which water is supplied and revaporizes the live steam to generate pure steam having high purity. The present invention relates to a reboiler.

[0002]

2. Description of the Related Art Generally, in the food industry, pharmaceutical industry, air conditioning industry, etc., when steaming, indirect heating, or heat treatment of food materials such as steam sterilization, live steam generated by a boiler is supplied with water. It uses the re-evaporated steam that has been re-evaporated by blowing it into the re-boiler, but since it does not remove the sludge generated during use, the floating material, and the sludge settling at the bottom, , Water, iron, calcium carbonate, boiler additives, etc. were often accompanied. Further, for example, in the food industry, the chemicals used for boiler additives are used for foods to enhance safety, but still contain iron concentration components, hardness components and contaminants such as fats and oils, It was not preferable for food processing.

By the way, conventionally, a reboiler as shown in FIG. 2 has been used to generate revaporized vapor.

As shown in FIG. 2, the conventional reboiler has the following structure.
The water supply pipe (3) and the branch pipes (4) and (4) at the tip of the peripheral wall portion (2) of the self-supporting vertically long cylindrical container (1), to which water is supplied to the lower portion, have a steam injection nozzle (5) ( The steam introducing pipes (6) each provided with 5) are fixed through, and the tip of the water supply pipe (3) and the steam blowing nozzles (5) and (5) are held at the bottom of the container (1). Further, an outlet pipe (8) for pure steam (P) is connected and opened to the top wall portion (7) of the container (1). A first discharge pipe for discharging a contaminant (a) floating on the surface of water, that is, on the gas-liquid interface (9), at a part of the peripheral wall portion (2) of the container (1). (10) is connected and opened, and at the substantially central portion of the bottom wall (12) of the container (1), a sedimentable pollutant (b) such as iron fine particles settled at the bottom of the container (1) is attached. The second discharge pipe (13) for discharging is connected and opened. Both of the above discharge pipes (10) (1
3) is joined to the joining pipe (14) in the middle of the pipe, and the first and second on-off valves (15) and (16) are provided in the middle of the discharge pipes (10) and (13), respectively. ..

Then, when the live steam (S) is blown into the water (W) supplied into the container (1) through the water supply pipe (3) through the steam introducing pipe (6), the live steam After being deprived of heat by water, the whole amount is once condensed and then re-evaporated from the gas-liquid interface (9) of water. The floating contaminant (a) generated at the gas-liquid interface (9) due to the condensation of the above-mentioned live steam, together with water, flows into the first discharge pipe (10) connected to the peripheral wall portion (2) of the container (1). It is discharged and flows into the merging pipe (14) through the first opening / closing valve (15) which is normally open during the operation of the device. Further, the second on-off valve (16) is periodically opened by a manual operation of an operator to remove the sedimentary pollutant (b) settled at the bottom of the container (1) into the second discharge pipe (16). ) Through the confluence pipe (1
Discharge to 4).

[0006]

According to the conventional reboiler, the peripheral wall portion of the container (1) having the first discharge pipe (10) connected and opened for discharging the floating pollutant (a). Since it is carried out only at one predetermined site in (2), it is difficult to reliably remove the floating contaminant (a). Therefore, a part of the pollutant (a) is discharged to the outlet pipe (8) together with the re-evaporated vapor that is re-evaporated from the gas-liquid interface (9) due to the pseudo-azeotropic phenomenon, so that the re-evaporated vapor has a floating property. There is a problem in that a pollutant (8) is contaminated and a pollutant having a high purity cannot be obtained.

Further, the operator must manually open and close the second on-off valve (16) to take out a certain amount of sedimentable pollutant (b) settled at the bottom of the container (1) in a timely manner. Alternatively, an automatic control valve must be used for the second on-off valve (16) to remove the sedimentable pollutant (b) at regular intervals. Therefore, maintenance and inspection becomes complicated, and maintenance and inspection work is extremely complicated.

The present invention has been proposed in view of the above problems, and it is an object of the present invention to provide a reboiler capable of obtaining pure vapor with high purity from which contaminants have been removed.

[0009]

In order to achieve the above-mentioned object, the present invention supplies the raw steam generated in the boiler to the lower part of the container and causes it to pass through the water accumulated in the lower part of the container to be condensed. In a reboiler in which steam is re-evaporated from the water, and the re-evaporated steam is taken out through an outlet pipe connected to the upper portion of the container, a pipe that is held through the container and is outside the container A funnel-shaped discharge nozzle is attached to the upper end of a predetermined bent shape discharge pipe with a venturi part in the middle, and the discharge pipe is discharged from the upper side contaminated water containing floating contaminants on the gas-liquid interface. Both ends of the suction pipe having a reverse U-shaped U pipe part that is disposed in the center of the container so that the lower side contaminated water containing the sedimentable pollutant that has settled at the bottom of the container can be sucked in. , Bottom wall of the container and discharge Connection openings to the venturi section, U
The top pipe part of the pipe part is held above the gas-liquid interface in the container by a predetermined dimension, and a discharge valve is provided below the venturi part of the discharge pipe, which opens when a certain amount of upper contaminated water is accumulated in the discharge pipe. It is a thing.

[0010]

The upper contaminated water containing floating contaminants generated at the gas-liquid interface due to the condensation of the live steam supplied to the lower part of the container is discharged like a funnel arranged in the substantially central part of the container. The nozzle overflows and flows down into the discharge pipe, and gradually accumulates in a part of the suction pipe communicating with the discharge pipe and the venturi portion of the discharge pipe. Then, when the upper contaminated water reaches the upper predetermined position of the discharge pipe, the discharge valve opens, and the upper side contaminated water in the discharge pipe passes through the venturi portion and is discharged to the outside at once. When the upper side contaminated water passes through the venturi portion, a suction force acts on the bottom portion of the container via the suction pipe by the venturi action. Then, the lower contaminated water containing the sedimentary pollutants settled at the bottom of the container is sucked into the venturi portion of the discharge pipe via the suction pipe, merges with the upper contaminated water, and is discharged to the outside.

[0011]

Embodiment An embodiment of a reboiler according to the present invention will be described below with reference to FIG.
The explanation is as follows with reference to.

As shown in FIG. 1, a water supply pipe (23) is provided at a lower portion of a peripheral wall portion (22) of a self-standing vertical cylindrical container (21).
Further, the steam introducing pipe (24) connected to the boiler is fixed through, and the steam blowing nozzle (25) is attached to the tip of the steam introducing pipe (24). The top wall portion (2) of the container (21)
An outlet pipe (27) for pure steam (P) is connected and opened at 6). A discharge pipe (28) having a predetermined bending shape is penetratingly fixed to a predetermined portion of the peripheral wall portion (22) of the container (21), and the peripheral wall portion (22) of the container (21) is formed outside the container (21). A venturi portion (30) is provided below the vertical pipe portions (29) arranged in parallel, and at the upper end portion of the discharge pipe (28),
Container (21) with a funnel-shaped discharge nozzle (31) attached
The upper side contaminated water containing the pollutant (a) on the gas-liquid interface (37) floating around the discharge nozzle (31) can flow down to the discharge pipe (28). A discharge valve (32) that opens when a certain amount of contaminated water on the upper side is accumulated in the discharge pipe (28) is provided below the venturi portion (30) of the discharge pipe (28).

The bottom wall portion (33) of the container (21)
And a suction pipe (35) having an inverted U-shaped U pipe portion (34)
One end of is connected and opened. The other end of the suction pipe (35) is connected and opened to the venturi portion (30) of the discharge pipe (28), and the top pipe portion (36) forming the U pipe portion (34) is placed inside the container (21). A container-side vertical pipe portion (38) and a venturi-side vertical pipe portion (39) which are held at a predetermined size above the gas-liquid interface (37) of water and hang downward from both sides of the top pipe portion (36).
Are held substantially parallel to the vertical pipe portion (29) of the discharge pipe (28).

The opening diameter d of the upper opening of the funnel-shaped discharge nozzle (31), the gas-liquid interface (37) and the suction pipe (3).
The space dimension h between the top pipe parts (36) of 5) is set to the container (21).
The inner diameter dimension of the discharge pipe (28) and the suction pipe (35) is about 15 minutes of the inner diameter dimension D of the container (21). 1 to 1/20 of the above.

Thus, when producing pure steam,
The discharge valve (32) on the discharge pipe (28) is kept closed, and water (W) is supplied to the container (21) through the water supply pipe (23). At this time, a part of the water supplied into the container (21) is part of the vertical pipe portion (38) of the suction pipe (35) on the container side.
And is held on the same plane as the gas-liquid interface (37). When the amount of water in the container (21) reaches a certain amount, the boiler is driven to drive the steam introduction pipe (24) and the steam injection nozzle (2).
The live steam (S) is blown into the container (21) via 5).
Due to the blowing of the live steam, the live steam is deprived of heat and once condensed entirely, it is re-evaporated from the gas-liquid interface (37) of water. The floating contaminant (a) floats on the gas-liquid interface (37) due to the condensation of the live steam, and the gas-liquid interface (37)
And a sedimentable pollutant (b) composed of a heavy component such as iron fine particles settles at the bottom of the container (21).

The upper side contaminated water containing floating floating pollutants (a) on the raised gas-liquid interface (37) overflows the funnel-shaped discharge nozzle (31), and
After flowing down to the discharge pipe (28), since the discharge valve (32) is closed, it gradually accumulates in the discharge pipe (28). At this time, since the discharge nozzle (31) is disposed in the center of the container (21), the overflow amount of the upper side contaminated water increases, and the floating contaminant (a) on the gas-liquid interface (37) increases. ) All flow into the discharge nozzle (31), and the pseudo-azeotropic phenomenon can be prevented from occurring. Further, the venturi side vertical pipe part (39) of the suction pipe (35) is the venturi part (3) of the discharge pipe (28).
0), the upper side contaminated water in the discharge pipe (28) is sucked into the suction pipe (3) through the venturi portion (30).
5) It gradually collects in the Venturi side vertical pipe part (39).

Then, the upper side contaminated water is discharged from the discharge pipe (28).
When a certain amount is accumulated in the exhaust pipe (28), the upper side contaminated water accumulated in the exhaust pipe (28) is discharged to the venturi portion (3).
It is discharged to the outside at once through 0). When the upper side contaminated water passes through the venturi part (30) of the discharge pipe (28),
The venturi action causes the container (2) to pass through the suction pipe (35).
The suction force acts on the bottom of 1), and the lower side contaminated water containing the sedimentable pollutant (b) that has settled on the bottom of the suction pipe (3
5) The space portion (4) formed in the upper portion of the U pipe portion (34)
The amount corresponding to 0) is sucked into the venturi portion (30) of the discharge pipe (28). The lower side contaminated water sucked by the venturi portion (30) joins with the upper side contaminated water flowing through the discharge pipe (28), and then passes through the discharge valve (32) to be discharged to the outside.

In this way, when the upper side contaminated water and the lower side contaminated water are discharged to the outside through the discharge pipe (28) and the upper contaminated water does not flow through the venturi portion (30) of the discharge pipe (28), the suction pipe. The suction force does not act on (35), and the suction of the lower side contaminated water is stopped. Thereafter, the upper contaminated water and the lower contaminated water are discharged to the outside in the same manner.

According to the above procedure, the floating contaminant (a) on the gas-liquid interface (37) is surely removed, so that a pseudo-azeotropic phenomenon does not occur and a pure pure substance having no impurities is obtained. Steam (P) can be obtained.

[0020]

According to the present invention, it is possible to reliably remove floating contaminants on the gas-liquid interface, so that by the pseudo-azeotropic phenomenon, floating contaminants can be removed together with the re-evaporated vapor. Pure steam with high purity can be obtained without being taken out. Therefore, during heat treatment of food materials or the like by steaming, indirect heating, or steam sterilization, heat transfer efficiency can be significantly improved, and safety and hygiene are extremely good. Moreover, not only floating pollutants but also sedimentable pollutants can be automatically discharged, which makes maintenance free and greatly improves workability.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a reboiler according to the present invention.

FIG. 2 is a structural explanatory view of a conventional reboiler.

[Explanation of symbols]

 a Floating pollutant b Precipitating pollutant 21 Container 28 Discharge pipe 30 Venturi part 31 Discharge nozzle 32 Discharge valve 34 U pipe part 35 Suction pipe

Claims (1)

[Claims] 1. Live steam generated in a boiler is supplied to a lower portion of a container and is condensed by passing through water accumulated in the lower part of the container. The condensed live steam is re-evaporated from the water, and the re-evaporated steam is In a reboiler adapted to take out through an outlet pipe that is connected and opened to the upper part of the container, the upper end of a predetermined bent shape discharge pipe that is held through the container and has a venturi part in the middle of the pipe outside the container A funnel-shaped discharge nozzle is attached to the container, and the discharge nozzle is arranged in the center of the container so that the upper contaminated water containing floating contaminants on the gas-liquid interface overflows and can flow down to the discharge pipe. Both ends of the suction pipe having an inverted U-shaped U pipe part capable of sucking the lower side contaminated water containing the sedimentary pollutant that has settled at the bottom of the container are connected to the bottom wall of the container and the venturi part of the discharge pipe. Open the top tube of the U tube A discharge valve that is held above the gas-liquid interface in the vessel by a predetermined size and that is provided below the venturi portion of the discharge pipe and that opens when a certain amount of upper contaminated water is accumulated in the discharge pipe is provided. Boiling device.