JP2014185815A - Heat exchange device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a heat exchange device by preventing the temperature increase of an outer shell due to input of heat from a heating heat medium, by applying a low temperature material to the outer shell, and dispensing with installation of an internal heat insulating material.SOLUTION: A heat exchange device is configured so that a heating-heat-medium inlet port is connected to an inner shell, a heating-heat-medium outlet port is connected to a second outer shell provided between an outer shell and the inner shell concentrically with the outer shell, a heating heat medium flowing into the inner shell turns around just before a plenum portion and flows into the heating-heat-medium outlet port from an outside of the inner shell, and so that a second cooling heat medium for cooling the outer shell flows between the outer shell and the second outer shell.

Description

  The present invention relates to a heat exchange device with reduced manufacturing costs, and more particularly to a heat exchange device useful as an intermediate heat exchanger of a high temperature gas furnace or a steam generator.

  As a prior art closest to the present invention, there is an intermediate heat exchanger of a high temperature engineering test research reactor shown as Non-Patent Document 1. As shown in FIG. 4, this intermediate heat exchanger has a structure in which two types of cooling heat medium having different conditions from the heating heat medium flow in. The inner cylinder, the outer cylinder, the heat transfer section, the inner It consists of a cylinder and a connecting pipe. Hereinafter, for comparison with the present invention, description will be made using the terms heating heat medium, first cooling heat medium, and second cooling heat medium used in the present invention. In this intermediate heat exchanger, the heating heat medium flows into the inner cylinder from the inlet at the bottom of the heat exchanger, supplies heat to the first cooling heat medium while ascending the outside of the heat transfer tube, and heat exchange Out of the vessel. The first cooling heat medium flows into the connecting pipe, receives heat while descending the heat transfer section, and flows out of the heat exchanger through the inner cylinder. The second cooling heat medium descends the annular flow path between the inner cylinder and the outer cylinder while cooling the cylinder portion, and flows out of the heat exchanger.

Kazuhiko Kunitomi et al. “Strength Evaluation of Intermediate Heat Exchanger Heat Transfer Tube in High Temperature Engineering Test Reactor” JAERI-M92-147 (1992)

  When the conventional heat exchanger described above is used under the condition that the mass flow rate of the heating heat medium is large, the heat transfer section outlet temperature of the heating heat medium becomes high. Or, it was necessary to construct an internal heat insulating material, and there was a problem that the production cost increased.

  Accordingly, the object of the present invention is to prevent the temperature rise of the outer cylinder due to heat input from the heating heat medium, and to eliminate the need for the application of low-temperature materials to the outer cylinder and the construction of the internal heat insulating material. It is to reduce the manufacturing cost of the.

  As the most basic structure for achieving the above object, in the present invention, a second outer cylinder is added between the inner cylinder and the outer cylinder, and an annular flow path formed between the outer cylinder and the second outer cylinder. Inflow of a part of the second cooling heat medium into the outer cylinder prevents the temperature rise of the outer cylinder due to heat input from the heating heat medium. By making it unnecessary, the manufacturing cost of the heat exchange device is reduced.

  Specifically, a heat exchange device according to one aspect of the present invention includes an outer cylinder provided with a plenum portion, an inner cylinder provided concentrically therein, and a plurality of heat transfer tubes for performing heat exchange. And an inner cylinder provided concentrically with the inner cylinder so as to pass through the plenum portion, and a heating medium is allowed to flow into the inner cylinder, and a first cooling is applied to the heat transfer tube. A heat exchange device for inflowing the heat medium for heat flow, exchanging heat, and then flowing the first cooling heat medium out of the outer cylinder through the inner cylinder, The outlet of the heating heat medium is connected to the inner cylinder to a second outer cylinder concentrically provided with the outer cylinder between the outer cylinder and the inner cylinder, and flows into the inner cylinder. The heated heating medium is U-turned in front of the plenum portion, and the heating heat is supplied from the outside of the inner cylinder. A second cooling heat medium for cooling the outer cylinder flows between the outer cylinder and the second outer cylinder, and is configured to flow to the outlet of the medium.

  In the heat exchange device according to another aspect of the present invention, the heat exchange device described above further includes a side path parallel to the flow path of the second cooling heat medium, and the second path is provided with the second path. A flow rate adjusting valve for adjusting the flow rate of the cooling heat medium is provided.

  According to the present invention, a part of the second cooling heat medium is caused to flow between the outer cylinder and the second outer cylinder so as to prevent the temperature of the outer cylinder from rising. The tempered Mn-Mo steel for containers can be applied, and the manufacturing cost of the heat exchange device can be reduced.

FIG. 3 is a schematic structural diagram of the heat exchange device of the present invention in which two types of cooling heat media having different conditions from the heating heat medium flow. FIG. 2 is a cross-sectional view of the heat exchanger taken along line A-A ′ in FIG. 1. The graph for demonstrating the prevention effect of the temperature rise of the outer cylinder by this invention. A structural diagram of a conventional intermediate heat exchanger used in a high temperature engineering test research reactor.

  The structure and operation of the heat exchange device of the present invention will be described below with reference to the drawings. FIG. 1 shows a longitudinal section of a heat exchanging apparatus targeted by the present invention, and FIG. 2 shows a transverse section taken along line A-A 'of FIG. The purpose of the present heat exchange apparatus is to supply the heat retained in the heating heat medium to the first cooling heat medium. In addition, a second cooling heat medium having different conditions from the first cooling heat medium flows in and out.

  Please refer to FIG. 1 and FIG. The heat exchange apparatus shown in FIG. 1 includes an outer cylinder 10, a second outer cylinder 16 that constitutes an ascending flow path of a second cooling heat medium 40 a that cools the outer cylinder 10, and an upward flow of the heating heat medium 20 a. The inner cylinder 11 constituting the path, the heat transfer section 13 for heat exchange between the heating heat medium 20a and the first cooling heat medium 30a, the second flowing into the flow path between the outer cylinder 10 and the second outer cylinder 16. The pipe 17 and the flow rate adjusting valve 18 that form a side path for adjusting the mass flow rate of the cooling heat medium 40a, the connecting pipe 19 that causes the first cooling heat medium 30a to flow into the heat transfer section 13, and the inner cylinder 14 are configured. Is done.

  Here, Table 1 shows the materials of the heat transfer section, the connecting tube, the inner cylinder, the outer cylinder, the second outer cylinder, the inner cylinder, the upper mirror 1, the upper mirror 2, and the lower mirror in one embodiment of the present invention.

  Table 2 shows dimensions such as the outer diameter and length of the heat transfer section, the outer cylinder, the second outer cylinder, the inner cylinder, the inner cylinder, the upper mirror 1, the upper mirror 2, and the lower mirror.

  The heating heat medium 20a in the present heat exchange device flows into the inner cylinder 11, then supplies heat to the first cooling heat medium while ascending the heat transfer section 13, and is indicated by an arrow at one end of the inner cylinder. As shown, it makes a U-turn, descends the annular flow path between the inner cylinder and the second outer cylinder 16, and flows out of the heat exchanger. At this time, the temperature of the outer cylinder 10 due to heat input from the heating heat medium 20a by allowing a part of the second cooling heat medium 40a to flow into the annular flow path between the second outer cylinder 16 and the outer cylinder 10. By preventing the rise, as shown in Table 1, to apply low temperature materials such as tempered Mn-M0 steel for pressure vessels to the outer trunk, etc., or to eliminate the need for construction of internal insulation Make it possible.

  Part of the second cooling heat medium 40a flowing into the annular flow path between the second outer cylinder 16 and the outer cylinder 10 is mixed with the heating heat medium 20a and flows out of the heat exchange device. In order to prevent a decrease in the mixing temperature and an increase in the outer cylinder temperature, a pipe 17 and a flow rate adjusting valve 18 are provided, and a second flow is introduced into the annular flow path between the second outer cylinder 16 and the outer cylinder. The mass flow rate of the cooling heat medium 40a is adjusted. For example, a helical coil type used in the prior art can be applied to the type of the heat transfer section 13.

  Next, the effect of the present invention will be described with reference to FIG. The graph of FIG. 3 is a diagram for explaining the effect of preventing the temperature rise of the outer body according to the present invention. In FIG. 3, graph (a) shows the outer cylinder temperature when a part of the second cooling heat medium is introduced into the annular flow path between the second outer cylinder and the outer cylinder, and (b) shows the conventional intermediate temperature. The outer cylinder temperature when the second outer cylinder is not provided as in the heat exchanger, (c) indicates the temperature of the heating medium for heating the flow path between the inner cylinder and the inner cylinder, and the broken line indicates the tempered Mn- This is the use limit temperature of Mo steel.

  When the conventional technology is applied, the temperature of the outer shell 10 rises due to heat input from the heating medium 20a and exceeds the temperature limit for use of tempered Mn-Mo steel (low temperature material) for pressure vessels. Application of a material (for example, nickel-base heat-resistant alloy) or construction of an internal heat insulating material is required. In the present invention, a part of the second cooling heat medium 40a is caused to flow between the outer cylinder 10 and the second outer cylinder 16 to prevent the temperature of the outer cylinder 10 from rising. Steel can be applied, and the manufacturing cost of the heat exchange device can be reduced.

  The above embodiments are intended to illustrate the principles of the present invention and practical applications. The present invention is not limited to the items described here, and many modifications and applications can be made to the configuration presented above. For example, many applications are possible, such as setting the inflow / outflow position of the first cooling heat medium 30a, the flow direction of the heat medium, and the inner cylinder opening downward. Similarly, there are various means for adjusting the washing amount of the second cooling heat medium 40a. Furthermore, there are various types such as a plate fin type in the heat transfer section 13. The structure of the present invention can be applied to the steam generator by making the flow direction of the first cooling heat medium vertically upward and reversing the flow direction of the heating heat medium.

  Since the heating heat medium handled in the present invention is extremely high in temperature, usually the heating heat medium 20a, 20b, the first cooling heat medium 30a, 30b, and the second cooling heat medium 40a, 40b are gaseous helium. Is used. However, it is also possible to use cooling water instead of gaseous helium, for example, by pressurizing the first cooling heat medium 30a, 30b.

DESCRIPTION OF SYMBOLS 10 ... Outer cylinder 11 ... Inner cylinder 13 ... Heat-transfer part 14 ... Inner cylinder 15 ... Plenum 16 ... 2nd outer cylinder 17 ... Pipe 18 ... Flow control valve 19 ... Communication pipe 20a, 20b ... Heating medium 30a, 30b ... First cooling heat medium 40a, 40b ... second cooling heat medium

Claims (6)

An outer cylinder provided with a plenum part, an inner cylinder provided concentrically within the outer cylinder, and a plurality of heat transfer tubes for performing heat exchange, and concentric with the inner cylinder so as to penetrate the plenum part And a heating heat medium is allowed to flow into the inner cylinder, and a first cooling heat medium is allowed to flow into the heat transfer tube to perform heat exchange, and then the first cooling. In a heat exchanging apparatus that causes the heat medium to flow out of the outer cylinder through the inner cylinder,
An inlet for the heating medium is provided in the inner cylinder, and an outlet for the heating medium is provided between the outer cylinder and the inner cylinder. The second outer cylinder is provided concentrically with the outer cylinder. connection,
The heating medium flowing into the inner cylinder is configured to make a U-turn before the plenum part and flow from the outside of the inner cylinder to the outlet of the heating medium,
A heat exchange device, wherein a second cooling heat medium for cooling the outer cylinder flows between the outer cylinder and the second outer cylinder.   The heat exchange device according to claim 1, wherein a heat insulating material is provided inside the inner body.   3. The heat exchange device according to claim 1, further comprising a side path parallel to the flow path of the second cooling heat medium, and adjusting the flow rate of the second cooling heat medium in the side path. The heat exchange device is provided with a flow rate adjusting valve.   4. The heat exchange device according to claim 1, wherein the heating heat medium, the first cooling heat medium, and the second cooling heat medium are gaseous helium. 5. Heat exchange device.   4. The heat exchange device according to claim 1, wherein the first cooling heat medium is cooling water. 5. The heat exchange device according to any one of claims 1 to 5, wherein the outer body is formed of tempered Mn-Mo steel for pressure vessels.

Images