JPH10212907A - Axial flow exhaust condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To require no restraint of a vacuum reaction force by inserting a tie-rod in a trunk main body and receive no restriction for the arrangement of a pipe nest in the shell main body and improve the performance of an axial flow exhaust condenser by making a support structure in which a vacuum reaction force in the axial flow exhaust condenser is borne by a support rod installed between the outer surface of an intermediate shell and the base of a steam turbine. SOLUTION: In an axial flow exhaust condenser in which a shell main body 1, in whose inside a pipe nest 53 is assembled, for cooling the exhaust of a steam turbine 51 and an intermediate trunk 2, interposed between the shell main body 1 and a steam turbine 51, for introducing the exhaust of the steam turbine 51 in the shell main body 1 are connected mutually in a nearly horizontal direction, a support rod 3 is interposed between the outer surface of the intermediate shell 2 and the base 4 of the steam turbine 51 so as to restrain the vacuum reaction force acting to the shell main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial exhaust condenser applied to a steam turbine or the like.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of a conventional axial exhaust condenser used in a steam turbine or the like. In the figure,
The exhaust gas leaving the steam turbine 51 passes through an intermediate body 52 of the axial exhaust condenser, and a body 54 in which a tube nest 53 is incorporated.
And is cooled by heat exchange to become condensed water, which accumulates in a hot well 55 provided at a lower portion of the body 54.

In an axial exhaust condenser, a vacuum reaction force in a direction indicated by an arrow A acts on the body 54 in a horizontal direction due to contraction of the body in the axial exhaust condenser in contrast to the vertical steam condenser of the vertical steam flow. A plurality of tie rods (Tie Rods) 56 are inserted thereinto to fix the trunk body 54 and the intermediate trunk 52, thereby suppressing the vacuum reaction force. A telescopic joint 57 is attached to each of the intermediate body 52 and the body 54 to cope with thermal expansion in both directions indicated by the arrow B. One end of the axial exhaust condenser is fixed to and supported by the base 58 of the steam turbine 51 via the steam turbine 51, and the other end is placed on the foundation 59 of the body 54 in the axial direction of the axial exhaust condenser. Is mounted via a leg 60 movably provided on the base.

[0004]

As described above, in the conventional axial exhaust condenser, a plurality of tie rods 56 are connected to the body 54 to suppress the vacuum reaction force acting in the horizontal direction.
Because of the necessity of insertion into the inside, the arrangement of the tube nest 53 is significantly restricted.

In general, a condenser used in a steam turbine has a small temperature difference, so that there is a problem that the condensing temperature is reduced due to a pressure loss. In particular, since the condenser is large and the number of heat transfer tubes is large, the pressure loss of steam becomes considerably large unless the arrangement of the tube nests 53 in the body 54 is optimized.
In addition, it is inevitable that the leaked air is contained in the axial exhaust condenser. In order to prevent the leaked air from stagnating in the trunk body 54 and creating a dead space, the arrangement of the tube nests 53 is set. Need to be optimized.

[0006]

SUMMARY OF THE INVENTION An axial-flow exhaust condenser according to the present invention has an object to solve the above-mentioned problems, and has a tube nest incorporated therein for cooling the exhaust of a steam turbine, and a trunk body. And an outer surface of the intermediate cylinder in an axial exhaust condenser in which an intermediate cylinder that is interposed between the steam turbine and introduces exhaust of the steam turbine into the trunk body is connected to each other in a substantially horizontal direction. A support rod is interposed between the steam generator and the base of the steam turbine so as to suppress a vacuum reaction force acting on the body. Thus, in this axial exhaust condenser, one end of the support rod is attached to the outer surface of the intermediate cylinder, and the other end is attached to the base of the steam turbine so as to suppress the vacuum reaction force acting on the trunk body. The vacuum reaction force in the flow exhaust condenser is supported by a support rod installed between the outer surface of the intermediate cylinder and the base of the steam turbine. Need not be suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an axial exhaust condenser according to an embodiment of the present invention. In the drawing, the axial exhaust condenser according to the present embodiment is used for a steam turbine or the like. In the drawing, reference numeral 1 denotes a body, 2 denotes an intermediate body, 3 denotes a support rod, and 4 denotes a base of the steam turbine. Reference numeral 5 denotes a base of the trunk body 1, reference numeral 6 denotes an expansion joint, reference numeral 51 denotes a steam turbine, reference numeral 53 denotes a tube nest, and reference numeral 55 denotes a hot well. The exhaust gas leaving the steam turbine 51 passes through the intermediate body 2 of the axial exhaust condenser, and passes through the tube nest 5.
3 flows into the body 1 in which it is incorporated, is cooled by heat exchange and becomes condensed water, and accumulates in a hot well 55 provided at a lower portion of the body 1.

In this axial flow exhaust condenser, as shown in the figure, a plurality of support rods 3 are horizontally or parallelly welded to the outer surfaces of both sides of an intermediate body 2 attached to the body 1 or intermediately provided. An ear plate or the like is welded to the body 2 and fixed to the ear plate with a bolt or the like and attached. The other end of the support rod 3 is fixedly attached to the base 4 of the steam turbine 51. The support bar 3 suppresses the vacuum reaction force in the direction indicated by the arrow A. Although the trunk body 1 is fixedly mounted on the foundation 5, the trunk body 1 has a structure capable of coping with some thermal expansion by making the leg mounting holes of the trunk body 1 elongated. The thermal expansion of the intermediate body 2 in the direction indicated by the arrow B is absorbed by the expansion joint 6.

As described above, in this axial flow exhaust condenser, one end of a plurality of support rods 3 is attached horizontally and parallel to both outer sides of the intermediate body 2 and the other end is fixed to the base 4 of the steam turbine. At the same time, the condenser body 1 is fixed to the condenser base 5 so as to cope with some thermal expansion. By providing the axial exhaust condenser with such a supporting structure against the vacuum reaction force, the vacuum reaction force
The support rod 3 fixedly mounted on the support member bears the load. Therefore,
It is not necessary to suppress the vacuum reaction force by inserting a tie rod or the like into the trunk main body 1, and the arrangement of the tube nests 53 in the trunk main body 1 is not restricted. Further, since the body 1 is fixedly mounted on the foundation 5, the intermediate body 2 thermally expands toward the steam turbine 51 side and is absorbed by the expansion joint 6.

In the conventional axial exhaust condenser, it is necessary to insert a plurality of tie rods into the body of the body in order to suppress the vacuum reaction force acting in the horizontal direction. is recieving. Generally, a condenser used in a steam turbine has a small temperature difference, so that there is a problem that the condensing temperature is reduced due to a pressure loss. In particular, since the condenser is large and the number of heat transfer tubes is large, the pressure loss of steam becomes considerably large unless the arrangement of tube nests in the body of the body is optimized. In addition, it is inevitable that leaked air will be contained in the axial exhaust condenser, and in order to prevent this leaked air from stagnating in the trunk body and creating dead space, the arrangement of tube nests is optimized. There is a need to. In this axial flow exhaust condenser,
In order to solve such a problem, one end of a plurality of support rods 3 is attached horizontally and parallel to the outside of the intermediate body 2 of the axial exhaust condenser, and the other end is fixedly attached to the base 4 of the steam turbine. At the same time, the body 1 of the axial exhaust condenser is fixedly attached to the base 5 and the axial exhaust condenser has such a supporting structure in order to suppress the vacuum reaction force. There is no need to insert a tie rod or the like into the inside, and there is no restriction on the selection of the arrangement of the tube nests 53 which has a considerable influence on the performance of the axial exhaust condenser. Accordingly, the pressure loss of the steam is considerably reduced, and the leakage air contained in the axial exhaust condenser is not stagnated in the body of the body, thereby improving the performance of the axial exhaust condenser.

[0011]

The axial exhaust condenser according to the present invention is configured as described above, and the vacuum reaction force in the axial exhaust condenser is attached between the outer surface of the intermediate cylinder and the base of the steam turbine. With the support structure that bears the support rods, it is not necessary to insert tie rods etc. in the body to suppress the vacuum reaction force, so the body of the body has a considerable effect on the performance of the axial flow exhaust condenser There is no restriction on the arrangement of tube nests in the inside, and the performance of the axial exhaust condenser is improved.

[Brief description of the drawings]

FIG. 1A is a front view of an axial exhaust condenser according to an embodiment of the present invention, and FIG. 1B is a plan view.

FIG. 2 is a front view of a conventional axial exhaust condenser.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Intermediate body 3 Support rod 4 Base of steam turbine 5 Base of body 6 Expansion joint 51 Steam turbine 53 Tube nest 55 Hot well

Claims (1)

[Claims] 1. A body having a tube nest incorporated therein for cooling exhaust of a steam turbine, and an intermediate member interposed between the body and the steam turbine for introducing exhaust of the steam turbine into the body. In an axial exhaust condenser in which the shells are connected to each other in a substantially horizontal direction, a support rod interposed between an outer surface of the intermediate shell and a base of the steam turbine for suppressing a vacuum reaction force acting on the shell main body. An axial exhaust condenser comprising: