JPS58203390A - Condenser - Google Patents

Abstract

PURPOSE:To prevent titanous condenser pipes from being broken, and to prolong their lives, by removing a fear that a baffle plate may hit the condenser pipes, by disposing rod materials of which section modulus is large in the vicinity of the baffle plate, in a condenser in which a baffle plate is disposed in a cluster of titanous condenser pipes, so as not to contact with condenser pipes. CONSTITUTION:Instead of condenser pipes, among titanous condenser pipes 4, in the vicinity of a baffle plate 11b, that is to say, in the neighborhood of the baffle plate 11b, solid bars 12, 12..., as an example of rod materials, are disposed, being supported by partitioning plates 7 and supporting plates 10. The steam discharged from a turbine collides against the condenser pipes 4 nearly in the sonic speed, and each condenser pipe 4 is deflected by this steam pressure. But collision will not occur among the condenser pipes, because distances among the partitioning plates 10 are determined so that the condenser pipes 4 do not contact with each other. Besides, the disposed distance between the condenser pipe 4 and the solid bar 12 is as same as the distance among the condenser pipes 4, and the solid bar 12 has larger section modulus than that of condenser pipe 4, its rigidity is large, and is harder to be deflected than the condenser pipe 4. Accordingly, condenser pipes 4 and solid bars 12 will not be contacted with each other, and repeated impact load acted on the condenser pipes 4 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a condenser used in power generation plants and the like, and relates to an improvement of a condenser made of bamboo and using titanium tubes as cooling tubes.

[Technical background of the invention and its problems]

First, a typical type of condenser is shown in Figs. 1 and 2. In Fig. 1, the casing 3 of the drainage capacity which condenses the exhaust steam exiting the turbine is shown. There are many cooling pipes μ, μ・
... are arranged in a row in the horizontal direction, and both ends of each cooling pipe are connected to inlet ice chambers formed at both ends of the casing 3.
and reaches the outlet ice chamber O, inside the casing 3 and both water chambers, t
, g'l are fixed to partition plates 7a and 7k. Cooling water is supplied to the inlet ice chamber j from the conduit r, and each cooling pipe 4 is supplied from the inlet water chamber j! The cooling water that has reached the outlet ice chamber B via the outlet is discharged from the conduit.

The intermediate portion of each of the cooling pipes is supported by a plurality of support plates 10, 10, . . . spaced apart in the axial direction of the cooling pipe.

Furthermore, as shown in FIG.
, //b and a deflection plate vertically arranged at an intermediate position between these three cooling tube groups /4'a l /
It can be divided into 4'tl l /IAc. Each of the deflection plates // is fixed to the partition plate 7 and the support plate 10.

In addition, the exhaust steam condensed by heat exchange with the cooling water in the cooling pipe v is discharged to the outside of the condenser λ via the conduit 72 connected to the lower end of the casing 3. According to the configuration, the exhaust steam of the turbine/condenser 2
each cooling pipe group 144a,
14cb, 744Q flows into each group/Honai from the outer periphery, exchanges heat with the cooling water in each cooling pipe V, and condenses and condenses. Then, the boiling water is discharged to the outside of the water container 2 via the conduit/2f.

By the way, the condensate condensed in the upper cooling pipe group/Hiroa falls sequentially onto the lower cooling pipes due to gravity and the downward flow of steam, but at that time, the thickness of the liquid film increases gradually. Heat transfer with cooling pipe μ deteriorates.

However, due to the presence of the deflection plates //a and //b arranged at an angle, the condensate preferable to the cooling pipe group /4ff& is
a, //k), both lower cooling pipe groups /4'
b, does not reach /4'O o Therefore, in these cooling tube groups /4(t) and /4ffO, there is no increase in the liquid film due to condensation in the upper cooling tube group lI/-a, and furthermore, Since the steam flow supplied to these return pipe groups /4fb and /Q-C is a horizontal flow, the condensed water is scattered horizontally by the high-speed steam flow, and as a result, the liquid film remains constant. , and a reduction in heat transfer is prevented.

As for the material of the cooling pipe t in the conventional condenser described above, since the cooling water flowing through the cooling pipe is seawater, copper alloy is generally used in consideration of its corrosion resistance. The wall thickness of the tube μ is usually about 0.2 mm.

However, the cooling pipe t is constantly subject to corrosion phenomena caused by seawater and inlet attack near the steam inlet end, so it deteriorates over many years of use and cools down over time. There was a problem in which a hole formed in the tube, causing a tube leak in the bath water.In a power generation plant, when a tube leak occurs in W1, plant operation (3) must be stopped and the output must be restricted. Therefore, there was a strong demand for the use of cooling pipes that do not cause tube leaks.

For this reason, in recent years, condensers 2 using cooling pipes made of titanium have begun to be adopted. Titanium is a metal with particularly excellent corrosion resistance and erosion resistance, so if titanium is used for cooling pipes, a condenser with no tube leaks can be realized.

However, titanium is a very expensive material, so in order to make each cooling pipe in a power plant condensate tank with tens of thousands of cooling pipes <<'1, it is necessary to reduce the amount of titanium used. In order to reduce this, it is necessary to reduce the thickness of the cooling pipe t. For this reason, considering the material properties of titanium, currently titanium cooling pipes have a wall thickness of 0. j8 is generally used.

Conventionally, condensers using the titanium cooling pipes mentioned above,
? , / All cooling pipes II of the condenser shown in Figs.
It was made of L'lr-titanium. But from power
In such a configuration, there is a power problem as shown below.

(4L) In other words, titanium materials have inferior wear characteristics compared to copper alloy materials and carbon steel materials commonly used in condensers, and they become relatively brittle when repeatedly brought into contact with dissimilar metals. It has been experimentally confirmed that cooling pipes using titanium pipes break at considerably lower repeated loads than cooling pipes made of copper alloy materials that have been used in the past. Because a thin-walled tube with a thickness of 0#'lB is used, the number of times the allowable repeated load due to contact with dissimilar metals is considerably lower than that of conventional cooling tubes made of copper alloy materials with a wall thickness of about 2 mm. The problem is that there are fewer.

By the way, in general, turbine exhaust steam with a flow velocity close to the speed of sound collides with a cooling pipe having a large water capacity, and the pressure of this steam causes the cooling pipe to bend. Condenser λ in Figures 1 and 2
In this case, the distance between the pair of adjacent support plates 10, 10 is selected so that one cooling pipe does not collide with or come into contact with another cooling pipe due to this deflection. The distance between the casing 3 and the cooling pipe at the outer periphery is also selected so that they do not come into contact with each other.

However, as shown in FIG. 3, it is desirable to make the distance between the cooling pipe hole and the deflection plate as small as possible. This is because the exhaust steam of the turbine 1 takes a short path through the gap between the cooling pipe 77 and the deflection plate 77, resulting in the condensation and first freezing of the steam.
This is to avoid passing through the cooling pipe group /ψ. In this way, when the steam passes through the cooling tube group/II'i, it flows into the air extractor (
(not shown), the capacity of the air extraction device must be increased.For this reason, the gap between the cooling pipe and the deflection plate 77 is usually set to about /QMJII. This gap is a gap where the cooling pipe and the deflection plate do not come into contact with each other, and furthermore, the vapor is not discharged from the condenser λ, but the deflection plate made of thin carbon steel plate /f When welding to the support plate 10, the vertical plate // is distorted due to heat influence.
Or, due to other manufacturing errors, the gap between the cooling pipe and the deflection plate l1 may be several U or less.

In such a state, if the cooling pipe t is bent due to the pressure of the steam, or if the deflection plate/l is bent due to the vibration t due to the steam pressure or falling water, the cooling pipe t will be bent. The deflection plate // may come into contact. If this tangent angle is repeated, the repeated loads of different metals will act on the titanium cooling pipe, and as is clear from the test results mentioned above, the titanium cooling pipe will It becomes brittle and there is a risk of damage.

[Purpose of Seal 1] In view of the above, the present invention has been made with the purpose of providing a '6i rectangular box which does not have a titanium cooling pipe that would be damaged by contact with the Ti facing plate. A large rod member with a cross section of t7 is arranged near the deflection plate.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the embodiments shown in the drawings. Ru.

The overall configuration of the present invention is the same as that of the general Li condenser shown in FIGS. 1 and 2, so here we will discuss the main parts (7).

FIG. 7 shows an embodiment of the present invention, and shows how the first, second, and second toy 1 is constructed. In this figure, reference numerals indicate cooling pipes made of titanium, and instead of the cooling pipes located near the deflection plate llb, that is, adjacent to the deflection plate //111, a rod member is used. Solid bar as an example of /2
, /:l... is placed in the field. Note that solid rods 2-2 are also arranged near other upright plates //a and //Q (not shown).These solid rods 2 are connected to the partition plate 7 and the support shown in FIG. It is supported by f10, and its material is carbon steel or the like. The solid rod 2 has a much larger section modulus than the thin cooling pipe 1.

Next, we will explain the operation of the above-mentioned embodiment.As mentioned above, the turbine exhaust steam collides with the cooling pipes at a speed close to the speed of sound, and each cooling pipe V≠ is deflected by the pressure of this steam. The spacing between the support plates 10 is set so that the cooling pipes come into contact with each other even with this deflection, so that no collision occurs between the cooling pipes. Also, cooling pipe Hiro and Nakami ml,! The contact with the cooling tube and the solid rod/, 2 arrangement 1171
The spacing is equal to the spacing between the cooling pipes, and the solid rod has a larger section modulus than the cooling pipes, and is more rigid and less susceptible to bending than the cooling pipes. The solid rods 12 never come into contact.

Then, due to the manufacturing difference or deformation of the parallel direction 'Fj//b, or the vibration 1 or deformation of the deflection plate //'t) during operation, the direction plate//b is marked with the symbol B in Fig. In the situation shown, the deflection plate /lb will probe the solid rod /y, but the deflection plate /'b will deform or vibrate and even if the solid rod /? Because it is blocked by Tsukuda 1 direction root t/b and cooling pipe g, there is no contact. Therefore, the repeated impact load of the deflection plate //b does not act on the titanium cooling pipe, and it is possible to achieve a long life compared to the titanium cooling pipe, which has strong corrosion and erosion resistance. .

By the way, in the above-mentioned embodiment, a medium-length carbon steel rod was used as the rod member, but a titanium solid rod or thick-walled tube was used as the solid rod L2. if,
Since the section modulus is much larger than that of thin-walled cooling pipes, the resistance to impact loads is improved, and the properties of titanium are utilized, making them even more reliable.

In addition, when using a titanium cooling pipe l, the partition plate ~ (
Figure 1) is made of titanium or titanium clad steel, and welding is an essential condition for fixing the cooling pipe and the partition plate droplet in order to improve the axiality. By welding the bar or thick wall t' to the partition plate N made of titanium or titanium clad steel, reliability is further improved and it becomes safe and watertight.

〔Effect of the invention〕

As explained above, in the condenser according to the present invention, a large number of titanium cooling pipes are arranged and distributed, and within these cooling pipe groups, the deflection [-] is arranged so as not to contact the cooling pipes, and the Since a rod member with a large section modulus is arranged near the deflection plate, the deflection plate does not collide with the titanium cooling pipe, which is vulnerable to impact loads, and therefore has corrosion resistance and erosion resistance. The cooling pipe made of strong titanium will not be damaged and the condenser will have a long lifespan.

[Brief explanation of the drawing]

Figure 1 is an obituary diagram showing a general condenser, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a detailed view of section A in Figure 2, and Figure 2 is a detailed view of section A in Figure 2. O7 is a detailed view of part A in FIG. 2 showing an embodiment of the condenser according to the present invention. Turbine, condenser, 3. Casing, ≠. Cooling pipe. , 7 (7a
, 71))... Partition plate, 10... Support plate, //(/
/a, //b, //c) - deflection plate, /2... solid rod, /l (/4'fL, /4''b, /II
Q) ,,,Cooling pipe group〇Applicant Kiyoshi Inomata, 1'lb (//) Toki 1 Figure 2 Figure 2\'--\2, 14a 10, A 711su(/co)

Claims (1)

[Scope of Claims] l) A condenser in which a large number of titanium T cooling pipes are arranged in a line and a deflection plate is arranged in the group of these cooling pipes so as not to touch the cooling pipes, in which a deflection plate is arranged in the vicinity of the deflection plate. , a condenser characterized by having rod members having a large section modulus arranged therein. λ) The condenser according to claim 1, wherein the rod member is a solid rod. 3) @water container according to claim 1, wherein the rod member is a thick-walled pipe.