JP3507866B2 - Steam heating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating an object to be heated in a heat exchanger with steam.
The present invention relates to a steam heating device suitable for a relatively low temperature of about C. Specifically, it is used for steam heating of various reaction vessels used for a polymerization reaction or the like, a food distilling apparatus, a concentrating apparatus, or a sterilizing apparatus. 2. Description of the Related Art As a conventional steam heating device, for example, a device as disclosed in JP-A-3-241202 has been used. This is a system in which a pressure reducing valve, a heating vessel, and an ejector-type vacuum pump are sequentially arranged, and the ejector-type vacuum pump is composed of an ejector, a tank, and a spiral pump as a condensate discharge device. The heated low-pressure steam is supplied to the heating vessel, and the ejector-type vacuum pump is driven to maintain the inside of the heating vessel at a desired degree of vacuum, and the condensate generated by heating the object to be heated in the heating vessel is sucked. Thus, the object to be heated can be heated with a vacuum steam of 100 ° C. or less, or about 100 ° C., that is, a reduced pressure steam of an atmospheric pressure or less. In the above-mentioned conventional steam heating apparatus, since an ejector-type vacuum pump is used as a vacuum suction means, an ejector, a tank and a vortex pump are required at a minimum. However, there was a problem that it became expensive. In addition, it is necessary to continuously drive the centrifugal pump to supply the fluid to the ejector, so that the operation cost of the pump is not small and the maintenance cost is increased. Accordingly, it is an object of the present invention to provide a steam heating apparatus which is simple and inexpensive and has low maintenance costs. The technical means of the present invention taken to solve the above technical problem is to form a heating section in a heat exchanger and to connect a steam supply pipe for heating. And the heating
In the part connected with a condensate discharge device that discharges condensate generated by heating while heating with vacuum steam below atmospheric pressure , the condensate discharge device is formed by a falling portion having a desired length. , fitted with a liquid level-off valve to open and close valve becomes the predetermined liquid level in the falling portion Rutotomoni, the raised bottom is
The desired length of the heating section depends on the degree of vacuum required by the heating section.
Length, that is, the falling part sucks condensate and heats
Length capable of producing a head height commensurate with the degree of vacuum
That's what it was. The operation of the above technical means is as follows.
The steam supplied from the steam supply pipe to the heat exchanger is deprived of heat by the object to be heated by the heat exchanger itself and the heating unit, condensed, condensed, flows down to the falling part, and accumulates. Further, as the steam supplied to the heating unit is condensed, the pressure of the heating unit is reduced to the atmospheric pressure or less, and the condensate in the falling part is sucked up. The distance of the suction depends on the degree of vacuum generated in the heating section. Further, by supplying low-pressure heating steam from the steam supply pipe, the heat exchanger is heated by vacuum steam at a pressure lower than the atmospheric pressure. Condensate generated by heating the heat exchanger reaches the falling portion and reaches a predetermined liquid level, and is discharged to the outside from the liquid level on-off valve as needed. An embodiment showing a specific example of the above technical means will be described. A steam supply pipe 3 is connected to a heating section of the reaction vessel 1 as a heat exchanger, that is, a jacket section 2 by an on-off valve 4 and a pressure control valve 5.
Connect through. A bypass pipe 7 is provided between the on-off valve 4 and the pressure control valve 5 via an on-off valve 6, and is connected to the jacket portion 2. An atmosphere communication pipe 14 is connected to the lower side of the jacket 2 via an on-off valve 13. [0008] Falling portions 8 and 9 having a predetermined length are provided at a lower portion of the jacket portion 2 to form a condensate discharge device. A liquid level on-off valve 20 comprising a valve body 10, a connecting rod 11 and a float 12 is attached to the falling part 9. The valve seat 15 is opposed to the valve body 10.
Is formed below the falling portion 9. The liquid level on-off valve 20 is
When the float 12 moves up and down with the liquid level, the valve element 1
The valve 0 opens and closes the valve seat 5 to discharge or close the condensed water accumulated in the falling portions 8 and 9. Valve body 10 and float 12
By adjusting the length of the connecting rod 11 connecting the valves, the liquid level for opening and closing the valve can be adjusted. The lengths of the falling portions 8 and 9 may have a length corresponding to the degree of vacuum required in the jacket portion 2, but it is usually preferable that the length be approximately 10 meters. A replenishing water pipe 16 for replenishing water is attached to the side of the falling part 8. Next, the operation will be described. If it is necessary to remove the residual air in the jacket portion 2 before heating an object to be heated (not shown) inside the reaction vessel 1, first, the on-off valve 1
3 is opened, and then the on-off valve 6 of the bypass line 7 is opened.
Is supplied to the jacket portion 2 from the steam supply pipe 3 to supply high-pressure steam that is not subjected to pressure adjustment such as pressure reduction, and residual air is removed from the on-off valve 13. If the removal of residual air is not necessary before heating, the above operation is not necessary. The low-pressure heating steam once supplied from the steam supply pipe 3 via the pressure control valve 5 is condensed by heat transfer in the jacket portion 2 to become condensed water and accumulate in the falling portions 8 and 9.
In addition, since the vapor in the jacket portion 2 is condensed and its volume is rapidly reduced, the inside of the jacket portion 2 is in a vacuum state at atmospheric pressure or lower. While the inside of the jacket portion 2 is in a vacuum state, the falling portions 8 and 9 suck up the condensed water to generate a water head height proportional to the degree of vacuum. When the condensed water collected in the falling portions 8 and 9 is insufficient, water is supplied from the supply water pipe 16. By supplying low-pressure steam reduced to a predetermined pressure from the steam supply pipe 3 to the jacket portion 2 having a predetermined degree of vacuum again by the pressure control valve 5 from the steam supply pipe 3, the reaction vessel 1 has a predetermined vacuum steam, that is, 100 ° C. Heated with steam at the following temperatures: The condensate generated by heating the reactor 1 flows down from the jacket 2 to the falling portions 8 and 9, and falls.
When the liquid level of 9 rises, the liquid level on-off valve 20 opens and is discharged to the outside. As described above, according to the present invention, the degree of vacuum of the heat exchanger can be maintained by the falling part and the liquid level on-off valve, and the condensate generated can be discharged. Ejectors, tanks, centrifugal pumps, etc. are not required unlike an ejector-type vacuum pump, and the equipment itself can be made inexpensive. Also, operating costs of the centrifugal pump are unnecessary, and the maintenance cost of the equipment is almost eliminated. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an embodiment of a steam heating device of the present invention. [Description of Signs] 1 Reaction vessel 2 Jacket section 3 Steam supply pipe 5 Pressure control valve 8, 9 Falling section 10 Valve body 11 Connecting rod 12 Float 20 Liquid level opening / closing valve

Claims (1)

(57) [Claims 1] A heating section is formed in a heat exchanger, a heating steam supply pipe is connected, and the heating section has a pressure lower than the atmospheric pressure.
Heating with air steam and connecting a condensate discharge device that discharges condensate generated by heating, the condensate discharge device is formed with a falling portion having a desired length, and the falling portion has predetermined liquid level in the on-off valve for liquid level taken off valve <br/> Ri attached Rutotomoni, the desired length of the falling portion, a heating portion
Length according to the degree of vacuum required, that is, falling
Head sucks condensate and balances the degree of vacuum in the heating part
A steam heating device having a length capable of producing a height .