JPS627479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating non-condensable gas in a plate-type condenser in which a large number of plates are polymerized and housed in a container. In this type of plate condenser, a large number of plates are placed in a container and are polymerized through a gasket, thereby creating appropriately opened plate gaps for the passage of steam and gaps for the passage of cooling water. Alternating closed plate gaps are formed. That is, in FIG.
It is formed between the front surface of plate 1b and the back surface of plate 1b, and is open to the interior space of a container (not shown). Further, the steam flow path A is disconnected from the inlets and outlets 2 and 3 of the cooling water b by respective gaskets 4 and 5 installed around them. The plate gap for circulating the cooling water b, that is, the cooling water flow path B, is formed between the front surface of the plate 1b and the back surface of the plate 1a.
The container is closed off to the interior space of the container by a gasket 6 installed along the outer periphery of the container. This cooling water flow path B communicates with the cooling water inlets and outlets 2 and 3. Steam a flows into the steam flow path A from the opening on the outer periphery of the plate 1a where the gasket is not installed, and as it passes toward the lower opening, it passes through the cooling water inlet in the adjacent cooling water flow path B. It is cooled and condensed by the cooling water b flowing from 2 toward the outlet 3, and the condensed liquid flows down along the plate surface and flows out from the lower opening. The functions of this type of condenser are roughly as described above, but steam generally contains non-condensable gas such as air, and depending on the amount of non-condensable gas, it becomes a dominant factor in heat transfer engineering. The factors are different. Therefore, it is difficult or extremely inefficient to apply one plate shape to the condensation of all types of steam. In view of the above-mentioned circumstances in this type of plate heat exchanger, this invention contains non-condensable gas by using one type of plate and changing the length of the gasket that constitutes the inlet of the steam flow path. An object of the present invention is to provide a method for treating non-condensable gas in a plate heat exchanger that can efficiently condense even steam. The features of this invention are that the steam flows from top to bottom in the steam flow path, and the cooling water flows from bottom to top in the cooling water flow path to create a completely countercurrent flow, and that The length of the gasket defining the steam inlet of the steam flow path can be adjusted and changed as appropriate. Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings. In the drawings showing the embodiment of the present invention, FIG. 2 shows the arrangement of gaskets defining the steam flow path when the amount of non-condensable gas in the steam is small. That is, on the surface of the plate 11a constituting the steam flow path 10A, gaskets 14 and 15 for cooling water sealing are installed around the inlet 12 and outlet 13 of the cooling water, respectively, and further, the steam flow path is sealed within the gap between the plates. 10A and to regulate the flow direction of the steam, short straight gaskets 17 and 18 extending upward are attached to the lower portions of both long sides of the plate 11a. In this case, since the amount of non-condensable gas is small, the main focus should be on improving the condensation heat transfer coefficient from a heat transfer engineering perspective, but with the above configuration, the opening area of the steam inlet at the top of the plate is wide, and the As a result, the steam flow rate at the inlet point is reduced, and static pressure recovery prevents a reduction in condensation at the center of the high performance heat transfer surface. As a result, a high heat transfer coefficient is ensured. On the other hand, FIG. 3 shows the arrangement of gaskets that define the steam flow path when the amount of non-condensable gas in the steam is large. In this case, the speed of movement of steam from the mixed steam to the heat transfer surface is a more dominant factor than the condensation heat transfer coefficient, so the gasket should be arranged in an effective way to increase the speed of movement. need to be taken. That is, the plate 21 constituting the steam flow path 20A
On the surface of a, there is a gasket 24 for sealing the cooling water.
and 25 are installed around the cooling water inlet 22 and outlet 23, respectively, and a gasket 28 for defining the steam flow path 20A and regulating the flow direction of steam.
Linear guides 28 and 29 extending upward are provided at the bottom of each long side on both sides of the plate 21a. As a result, the cross-sectional area of the steam flow path 20A is reduced, the steam flow rate is increased, and non-condensable gas is effectively discharged to the outside of the system. This eliminates the inhibition of contact between the steam and the heat transfer surface due to the retention of non-condensable gas in the steam flow path, making it possible to efficiently condense the steam. Although omitted in the drawing, the steam flow paths 10A, 2
The above gasket 17, 1 for specifying 0A
8, 28, and 29 also have the function of contacting and cooperating with a seal stay provided between the inner wall of the container and the long side of the plate to prevent a short pass or backflow of steam. As explained above, the present invention accommodates a large number of plates in a polymerized state through gaskets in a container, and uses gaps between the plates to close vapor flow paths that are appropriately opened to the space inside the container. A gasket for cooling water sealing is installed around the inlet and outlet of the cooling water on the surface of the plate constituting the steam flow path, and the inlet of the steam flow path is formed in the gap between the plates. In order to specify this and to regulate the flow direction of steam, straight gaskets extending upward were installed at the bottom of both long sides of the plate, and the length of the straight gaskets was adjusted and changed according to the properties of the steam. At the same time, the steam flowed in the steam flow path from the upper inlet to the lower outlet, and the cooling water flowed in the cooling water flow path from the bottom to the top to create a completely countercurrent flow, which prevented the mixture of noncondensable gases. It is possible to obtain a plate-type condenser that can exhibit high performance in each condensation mode without being greatly affected.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the schematic structure of this type of plate condenser. FIGS. 2 and 3 are front views of plates showing embodiments of the present invention, respectively. 11a, 21a...Plate, 10A, 20A
...Steam flow path, 17, 18 , 28, 29... Gasket for regulating the steam flow path.

Claims (1)

[Claims] 1. A large number of plates are housed in a container in a polymerized state through gaskets, and steam passages that are appropriately opened to the space inside the container and closed cooling water passages are alternately formed in the gaps between the plates. A cooling water sealing gasket is installed around the cooling water inlet and outlet on the surface of the plate constituting the steam flow path, and a gasket is installed to define the inlet of the steam flow path within the gap between the plates, and to seal the steam. In order to regulate the flow direction, straight gaskets extending upward are installed at the bottom of both long sides of the plate, and the length of the straight gaskets is adjusted according to the properties of the steam. A method of controlling non-condensable gas in a plate type condenser, which is characterized in that steam flows in a channel from an upper inlet to a lower outlet, and cooling water flows in a cooling water channel from the bottom to the top to create a complete counterflow. Processing method.