JPS6021316B2 - Condenser for steam containing non-condensable gas and method for adjusting condensation amount using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser useful for condensing steam containing non-condensable gases, and more particularly to a condenser that allows easy adjustment of the amount of condensation, and a method of adjusting the amount of condensation using the same. .

Generally, when the vapor to be condensed contains non-condensable gas, the non-condensable gas is condensed while being extracted to the outside from an appropriate location in the condensing system.

Usually the point of extraction is the condenser, especially the top of the condenser. However, when condensing is performed using a condenser with a suitable extraction part, controlling the amount of condensation, for example, controlling the condensation at a constant flow rate, is generally done by controlling the flow surface of the condenser and the amount of steam flowing into the condenser. Or, it is necessary to control at least two systems of condensate withdrawal and limit control. Various methods are used to do this, such as controlling the steam flow rate to a constant level and controlling the amount of condensation to keep the liquid level constant, or controlling the flow rate of cooling water in the condenser to keep the steam amount constant. However, there are methods to control the condensate flow rate to keep the liquid level constant.
In either case, the extraction of non-condensable gas is carried out as it happens without being involved in these controls. The condenser of the present invention is characterized by having a unique non-condensable gas extraction method, and the non-condensable gas extraction control can be involved in the control of the condenser, thereby simplifying the control method of the condenser. It can be used as a control system.

Accordingly, one object of the present invention is to provide a novel condenser for non-condensable gas-containing steam, and another object is to provide a useful method for controlling the amount of condensation using the same. To achieve such an object, the present invention provides a condenser having a heat exchange section having a non-condensable gas-containing steam inlet in the upper part and a liquid distillation part having a condensate outlet in the lower part. A condenser for condensing and degassing vapor containing non-condensable gas, characterized in that it has a closing part on the side wall of the liquid collecting part, and a gas venting pipe that connects the opening and a gas outlet part above the opening. {2' In a condenser that has a heat exchange section with a non-condensable gas-containing steam inlet in the upper part and a liquid crab part with a condensate outlet in the lower part, a sekiguchi part is installed on the side wall of the lower liquid collecting part. Using a condenser having a gas vent pipe that guides the closed part and the gas outlet part above the closed part, steam containing non-condensable gas is continuously introduced into the steam inlet, and a condensate outlet is provided. By adjusting the flow rate of the condensate drawn out, the liquid level position of the condensate in the liquid crab part is changed, and the closing area of the gas vent pipe is adjusted, thereby adjusting the pressure inside the condenser and increasing the amount of condensation. This invention is characterized by a method for adjusting the amount of condensation of steam containing non-condensable gas.

Next, the present invention will be explained in detail using the drawings.

FIG. 1 is a simplified flow sheet showing an example of the condenser of the present invention and the case where a certain amount of steam containing non-condensable gas is condensed using the condenser. In FIG. 1, 1 indicates a condenser, and a heat exchange section 2 and a steam inlet 3 are provided on the upper part of the condenser.
has. A cooling medium for the heat exchange section 2, such as industrial water or seawater, is introduced through a line 2a and discharged through a line 2b. Further, the lower part thereof is a condensate liquid crab part 4, and the liquid condensed in the heat exchange part 2 flows down here and is extracted to the outside from a condensate extraction port 5 provided at the bottom. It is now possible to On the other hand, a side wall 6 of the lower liquid storage section 4 is provided with a gate 7, and the gate 7 is connected to the gas vent pipe 8. The gas vent pipe 8 reaches a gas outlet part 9 located above the entrance part 7 by its rising part 8a. The liquid level of the condensed liquid in the liquid crab part 4 is indicated by 10, and the state of the liquid level 10 of the condensed liquid in the Sekiguchi part 7 as seen from the low arrow direction in FIG. 1 is shown in FIG. In the case of the condenser 1 having such a configuration as shown in FIG.
An example is shown in which a certain amount of steam (including non-condensable gases) is extracted from the tank, condensed, and then the condensate is returned to the column 20. Steam containing non-condensable gases is extracted from 20a, passes through a line 21, enters the steam inlet 3 of the condenser, is condensed by cold soot in the heat exchange section 2, and the liquid is transferred to the liquid distillation section 4. Non-condensable gas in the steam flows from the entrance 7 provided in the side wall 6 to the upper space of the gas vent pipe 8, that is, between the liquid level 10 and the gas vent pipe 8.
The gas passes through a region defined by the space 10a surrounded by the upper inner wall of the gas outlet section 9, and is led to the gas outlet section 9, from where it is discharged to the outside, for example, to the atmosphere, as shown by the arrow, or the non-condensable gas is useful. If so, you will be directed to the recovery device. On the other hand, the condensate is returned from the outlet 5 at the bottom of the condenser 1 through the line 22 to the crab tower 201 from 20b. A liquid transfer pump P may be appropriately provided in the line 22, and a flow rate control valve FV is also provided. In this example, the flow rate controller FC controls the flow rate control valve FV so that the flow rate value of the flow rate transmitter FT is always constant. In other words, the example in Fig. 1 is Kagani Tower 2.
The condenser of the present invention is used when condensing at a constant flow rate from zero. As a modification of this, so-called follow-up control is also possible, in which the set value of the flow rate controller FC is not kept constant but is changed by other process signals, and the set value of the flow rate control valve F
V may be changed manually as appropriate. If it is desired to change the amount of condensation in such a distillation column, the flow rate of the line 22 may be changed.

Specifically, for example, when trying to increase the amount of condensation, the set value of the flow controller FC is increased by the increasing value, and the flow rate control valve is increased until the set value and the transmitted value of the flow rate transmitter FT become equal. Flow controller FC is operated to open FV. As a result, first of all, the amount of condensate returned, ie the amount of liquid withdrawn from the condenser 1, increases correspondingly. Then, the liquid level 10 in the lower liquid reservoir 4 of the condenser 1 decreases, thereby increasing the space 10a of the gas vent pipe 8 and increasing the flow rate of the non-condensable gas extracted. As a result, the pressure inside the condenser 1 decreases, so the flow rate of steam from the line 21 increases and becomes balanced with the extraction of condensate. Of course, the cooling capacity of the heat exchange section 2 is selected to have a capacity sufficient to absorb such changes. The final equilibrium state is settled in a state where the amount of incoming steam increases in accordance with the increase in the amount of condensation, and the liquid level decreases to some extent due to the increase in the amount of extracted non-condensable gas. The case of reducing the amount of condensation is completely opposite to the above. In the condenser of the present invention, the amount of condensation can be changed by changing the exit area of the space 10a of the gas vent pipe 8 and changing the extraction amount of non-condensable gas, so the range of change in the closing area can be changed. Corresponds to the condensation amount change range.

In this sense, the dimensions and shapes of the closing part 7 and the gas vent pipe 8 must be made to meet the requirements, and if a large change in the amount of condensation is required, these dimensions must also be made large. However, these are just design issues.
Also, the cross-sectional shapes of the entrance part 7 and the gas vent pipe 8 are as shown in Figures 1 and 2.
It does not necessarily have to be circular as shown in the figure, and may be modified to an elliptical, square, triangular, or other polygonal shape as necessary. If the steam extracted from the rectification column does not contain any non-condensable gas as in the above example, an equivalent amount can be obtained by mixing non-condensable gas, such as air or nitrogen gas, from an appropriate location in the line 21. effect can be obtained.

According to the condenser of the present invention, it is possible to efficiently change or stabilize the amount of condensation with a simple adjustment method.

Furthermore, when using the condenser of the present invention, the liquid level does not have self-control like a normal condenser and requires some kind of liquid level control system, but the liquid level does not have self-control. Therefore, there is essentially no need for liquid level control. Furthermore, as in the example above, it is sufficient to insert a pressure drop (or fluctuation) element such as a valve only in the condensate line. It is advantageous that there is no need to consider the temperature difference between the

[Brief explanation of drawings]

FIG. 1 is a simplified diagram of the condenser of the present invention and its operational flow sheet. FIG. 2 is a view taken along the line 0--b in FIG. 1. In the figure,
1...Condenser, 2...Heat exchange section, 3.
...Steam inlet, 4...Liquid reservoir, 5...
... Condensate outlet, 6 ... Liquid reservoir side wall, 8
...Gas vent pipe, 10... Condensate liquid level, 21... Steam extraction line, 22...
・Condensate return line, P...pump, FT...
...Flow rate transmitter, FC...Flow rate controller, F
V...Represents a flow rate control valve. O diagram O 2 diagram

Claims (1)

[Scope of Claims] 1. In a condenser provided with a heat exchange part having a non-condensable gas-containing steam inlet in the upper part and a liquid collecting part having a condensate extraction port in the lower part, the side wall of the lower liquid collecting part has an opening in
A condenser for condensing and degassing steam containing non-condensable gas, characterized in that it has a gas vent pipe that communicates between the opening and a gas outlet above the opening. 2. In a condenser equipped with a heat exchange section having a non-condensable gas-containing steam inlet in the upper part and a liquid reservoir section having a condensate outlet in the lower part, the lower liquid reservoir section has an opening in the side wall. ,
Using a condenser having a gas vent pipe communicating between the opening and the gas outlet above it, steam containing non-condensable gas is continuously introduced into the steam inlet and extracted from the condensate outlet. By adjusting the flow rate of the condensate, the liquid surface position of the condensate in the liquid reservoir section is changed and the opening area of the gas vent pipe is adjusted, thereby adjusting the pressure inside the condenser and the amount of condensation. A method for adjusting the amount of condensation of non-condensable gas-containing steam.