JP2002147975A - Steam heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam heating device which is able to uniformly heat the entire heating portion by steam without retaining condensate which has been generated at the heating portion. SOLUTION: A jacket portion 2 which is connected with a steam supply pipe 5 is permitted to communicate with a gas-liquid separating vessel 3. A cooling pipe 16 is fixed to the inside of the vessel 3. A condensate compression pump 4 is connected to the lower part of the vessel 3. Steam that has been reevaporated in the vessel 3 is cooled by the cooling pipe 16 to allow the inside of the vessel 3 to have a negative pressure, and thus steam condensate in the jacket portion 2 is sucked without being retained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating an object to be heated with steam, and more particularly to a steam heating apparatus suitable for a case where the heating temperature is relatively low, such as about 100.degree. Specifically, it is used for steam heating of various reaction vessels used for a polymerization reaction or the like, a distilling apparatus, a concentrating apparatus, or a sterilizing apparatus for food. In these cases, the object to be heated often causes thermal damage due to a slight temperature change, and it is necessary to accurately maintain the heating temperature.

[0002]

2. Description of the Related Art A conventional steam heating device is disclosed in
No. 328422. In this method, a steam supply pipe for heating is connected to the heating section, a condensate recovery device that discharges condensate generated by heating is connected, and a replacement fluid supply pipe that replaces air in the heating section is connected. By removing the air in the heating unit by the replacement fluid and reducing the pressure, the steam can be heated at a low temperature of 100 ° C. or less.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Since the condensate generated in the heating section flows into the condensate recovery device by natural flow based on the head of the inflow, if the amount of condensate generated fluctuates and increases, the condensate in the heating section will be immediately retained without stagnation. There was a problem that the entire heating section could not be uniformly steam-heated because it could not be discharged outside the heating section and a part of the heating section was covered with condensate.

[0004] It is therefore an object of the present invention to provide a steam heating device capable of accurately maintaining a steam heating temperature at a predetermined value without retaining condensate generated in a heating section.

[0005]

Means of the present invention taken to solve the above-mentioned problems are to supply steam to a heating section to heat an object to be heated and to recover condensate generated by heating. In the case of pumping to a predetermined location by a water pressure pump, a gas-liquid separation container for separating condensate and steam is arranged between the heating unit and the condensate pressure pump, and the vapor in the gas-liquid separation container is condensed. It is equipped with heat exchange means.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Condensate generated in a heating section reaches a gas-liquid separation vessel, and a part of the condensate is re-evaporated into steam. By installing the heat exchange means in the gas-liquid separation vessel, the re-evaporated steam is cooled by the heat exchange means and condensed, causing a sudden decrease in its volume. State. Since the inside of the gas-liquid separation container is in a negative pressure state, the condensate generated in the heating unit quickly flows down to the gas-liquid separation container due to the pressure difference and does not stay in the heating unit.

As the heat exchange means, any means can be used as long as it can condense the steam. A means for directly contacting the steam and the cooling fluid to condense it, or a means for indirectly exchanging heat can be used. it can.

[0008]

EXAMPLE In this example, a reaction vessel 1 was used as a heating section.
An example of the jacket portion 2 is shown. In FIG. 1, a vapor heating device is constituted by a gas-liquid separation container 3 connected to a jacket portion 2 and a condensing pressure pump 4 connected to a lower portion of the gas-liquid separation container 3.

A valve 6 is connected to a steam supply pipe 5 for supplying steam for heating to the jacket 2. Steam at a predetermined pressure or temperature is supplied from the valve 6 to the jacket portion 2 to heat an object to be heated in the reactor 1 (not shown).

A lower portion of the jacket portion 2 is connected to an upper side surface of the gas-liquid separation container 3 via a pipe 7. Gas-liquid separation container 3
Is formed of a cylindrical container, and a cylindrical pipe 8 having a smaller diameter than the gas-liquid separation container 3 is provided at the center with a gap 9 provided at the lower end. A condensate discharge pipe 10 smaller in diameter than the cylindrical pipe 8 is attached to the lower part of the cylindrical pipe 8. The condensate discharge pipe 10 is connected to a condensate inlet 12 of the condensate pressure pump 4 by a pipe 11.

The condensate discharge pipe 10 is attached so that the upper end thereof is located above the lower end of the cylindrical pipe 8 by a predetermined length. A liquid reservoir 13 is formed by the outer circumference of the condensate discharge pipe 10, the inner circumference of the cylindrical pipe 8, and the lower circumference of the gas-liquid separation vessel 3. A valve 14 and a conduit 15 are attached to the upper end of the cylindrical pipe 8, and the valve 14 is opened so that it can communicate with the atmosphere.

A cooling pipe 16 as a heat exchange means is mounted above the inside of the gas-liquid separation vessel 3. The cooling pipe 16 spirally surrounds the outer periphery of the cylindrical pipe 8, supplies cooling fluid from a cooling fluid supply pipe 17, cools the vapor in the gas-liquid separation container 3, condenses the water, and makes it condensed. This is discharged from the cooling fluid outlet pipe 18 to the outside of the system or sent to a separate hot water usage point.

The steam supply pipe 5 is branched and connected to the upper part of the gas-liquid separation vessel 3 via a pipe 19 and a valve 20. The branch conduit 19 supplies a desired amount of steam when the amount of re-evaporated steam in the gas-liquid separation container 3 is small or fluctuates, thereby ensuring a reduced pressure state in the gas-liquid separation container 3. It is for.

A valve 21 and a check valve 22 are attached to a pipe 11 connecting the condensate discharge pipe 10 and the condensate inlet 12 of the condensate pressure pump 4. The check valve 22 is connected to the condensate discharge pipe 10.
This allows the passage of fluid only in the direction of the condensate pump 4 but does not allow the passage of fluid in the opposite direction.
The valve 21 adjusts the amount of condensate flowing down to the condensate pump 4.

A condensate pressure feed line 26 is connected to a condensate pressure feed port 23 of the condensate pressure feed pump 4 via a check valve 24 and a valve 25. The check valve 24 allows the fluid to pass only from the condensate pump 4 to the condensate feed line 26 in the outward direction.

A steam supply pipe 5 is provided above the condensing pump 4.
Is provided with a high-pressure steam inlet 28 connected to a steam pipe 27 branching off. An outlet 29 for high-pressure steam is provided beside the high-pressure steam inlet 28.

When the float (not shown) disposed inside is located at the lower part, the condensing pressure pump 4 closes the inlet 28 for high-pressure steam, opens the outlet 29, and connects the pipe 11 and the valve. The condensate in the gas-liquid separation vessel 3 flows down into the condensate pump 4 through the check valve 21, the check valve 22 and the condensate inlet 12.

When condensed water is accumulated in the condensate pressure pump 4 and a float (not shown) is located at a predetermined upper portion, the outlet 2
9 is closed, while a high-pressure steam inlet 28 is opened, and high-pressure steam flows from the steam pipe 27 into the condensate pump 4, and the condensate collected therein is sent to the pump 23 and the check valve 24. , A valve 25 and a condensate pressure feed pipe 26 to feed the water to a predetermined condensate pressure feed destination.

When the condensate is pumped and the liquid level in the condensate pump 4 drops, the inlet 28 is closed again and the outlet 29 is opened, so that the condensate is pumped from the condensate inlet 12. It flows down into the pump 4. By repeating such an operation cycle, the condensate pump 4 pumps the condensate in the gas-liquid separation vessel 3.

At the initial stage of heating the reactor 1, non-condensable air is retained in the jacket portion 2, and no liquid is present in the liquid reservoir 13 below the gas-liquid separation container 3.
In this state, when the valve 6 is opened to supply steam for heating to the jacket portion 2, the air in the jacket portion 2 is pushed out by the steam and reaches the gas-liquid separation vessel 3, where the lower liquid reservoir where no liquid exists does not exist. 13, the gap 9, the inside of the cylindrical pipe 8, and the outside through the valve 14 and the pipe 15.

As the air is discharged, the gas-liquid separation vessel 3
Condensed water generated by initial heating of the reaction vessel 1 flows into the inside and accumulates in the liquid storage section 13, and a part of the condensate is re-evaporated to become vapor again and accumulates above the gas-liquid separation vessel 3. Cooling pipe 1
By supplying the cooling fluid to 6, the re-evaporated vapor is condensed again to become condensed water, the volume of which is rapidly reduced, and the inside of the gas-liquid separation vessel 3 is reduced in pressure below the atmospheric pressure. Due to the reduced pressure, the condensate generated by heating in the jacket portion 2 is sucked into the gas-liquid separation container 3 and stored in the liquid storage portion 13.

The condensate collected in the liquid reservoir 13 flows down into the pump 4 when the discharge port 29 of the condensate pump 4 is opened, and when a predetermined amount is accumulated in the pump 4, a float (not shown) rises. The discharge port 29 is closed, and at the same time, the high-pressure steam inlet 28 is opened. The high-pressure steam is fed from the condensate pressure feed port 23 to a predetermined location.

[0023]

As described above, according to the present invention, a gas-liquid separation vessel for separating condensate and steam is disposed between the heating section and the condensing pump, and the vapor in the gas-liquid separation vessel is condensed. By attaching the heat exchange means, the condensate generated in the heating section does not stay, the entire heating section can be uniformly heated with steam, and the steam heating temperature can be accurately maintained at a predetermined value. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a steam heating device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reaction vessel 2 Jacket part 3 Gas-liquid separation container 4 Condensate pressure pump 5 Steam supply pipe 8 Cylindrical pipe 10 Condensate discharge pipe 12 Condensate inlet 16 Cooling pipe 23 Condensate pressure inlet 28 High pressure steam inlet 29 High pressure steam Vent

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L103 AA31 BB03 CC30 DD64 4D076 BC03 BC25 BC27 CB06 CB07 CB08 CB12 CD25 FA03 FA11 FA34 HA11 HA14 HA20 JA02 JA03 4G075 AA13 AA23 AA44 AA45 AA63 BB01 BB02 BB05 DA02 CA01 EC06 EC23 EC26 ED18 FC02

Claims (1)

[Claims] 1. A heater for supplying steam to a heating section to heat an object to be heated, and for condensing water generated by heating to a predetermined location by a condensate pump. A steam heating apparatus, comprising a gas-liquid separation vessel for separating condensate and steam between them, and a heat exchange means for condensing the steam in the gas-liquid separation vessel.