CN1340676A - Water supply heater - Google Patents

Abstract

The invention provides a feed water heater which can maintain high performance even when the capacity of a power generating plant is increased or the condition of heating steam is strict. The desuperheating section 29 of the feed water heater has two entrances 36 at its central part so that heating steam may flow from the entrances 36 to both ends of the section 29. The condensing section of the feed water heater is provided with a short pass preventing plate both ends of which are inserted into the slit sections of a lower pipe group and which covers the top of a bent pipe at its central part. A drain output seat is provided at the central position of the main body barrel of the heater in the vertical direction and a drain outlet seat guide plate which guides drains to the drain outlet seat is installed in a drain cooling section.

Description

Feed-water heater

Technical field that the present invention belongs to

The present invention relates to the employed feed-water heater in power station.

Background technology

Employed general thermal power plant in the steam importing turbine with the boiler generation, makes this steam expansion in turbine at present, and the thermal power transfer that steam is held is a mechanical energy thus, makes the generator rotation with this mechanical energy, obtains electric energy.

The system that Figure 10 shows so general heat power station constitutes.

In Figure 10, the steam by boiler 1 produces imports turbine 4 by main steam pipe 2 by steam check-valves 3.This steam flows while expanding in turbine 4 and does work, and thus, makes generator 5 rotations with the coaxial setting of turbine, obtains electric power.The steam that expands in turbine 4 flows in the condenser 6, this cooling, condensing, become condensed water, be trapped in the hot pond (hot well) 7 of condenser 6 bottoms.The condensed water that is detained is directed to condenser pipe 8, is boosted by the condensate pump 9 that is arranged in these condenser pipe 8 ways, becomes feedwater, is directed to low-pressure feed heater 10.

Low-pressure feed heater 10 is a kind of of the heat exchanger that is provided with in order to improve the power station thermal efficiency, and the steam that the pressure ratio of bleeding from the low-pressure stage of steam turbine 4 is lower guides by heating steam pipe 15a.In low-pressure feed heater 10, carry out heat exchange from steam and feedwater that the low-pressure stage of this steam turbine 4 is bled, make the feedwater heating.At this moment, the condensing condensed water that becomes of the steam of bleeding is directed to the low-pressure feed heater drainpipe 17 that pressure is lower than low-pressure feed heater 10, further is directed to condenser 6.

Feedwater by low-pressure feed heater 10 heating is directed to deaerator 11.Deaerator 11 is to be used for removing the molten machine that is stored in the non-condensing gases such as oxygen of feedwater, and the steam from the medium pressure grade of steam turbine 4 is bled guides by heating steam pipe 15b.Then, in deaerator 11, feeding water directly contacts with the steam of bleeding, and the molten non-condensing gas that is stored in the feedwater is separated and degasification as gas.

After feedwater by deaerator 11 arrives boiler feed pump 12 place's pressure and further raises, be directed to high-pressure feed-water heater 13.High-pressure feed-water heater 13 is the same with low-pressure feed heater 10, is a kind of of the heat exchanger that is provided with in order to improve the power station thermal efficiency, and its basic structure is also roughly the same.That is to say, in high-pressure feed-water heater 13, bleed and by the steam of heating steam pipe 15c guiding from the hiigh pressure stage of steam turbine 4, and carry out heat exchange between the feedwater of boosting, the further heating of feeding water.Then, at this moment, the condensing condensed water that becomes of steam process from the hiigh pressure stage of steam turbine 4 is bled is guided to deaerator 11 by the high-pressure feed-water heater drainpipe 18 that is connected in high-pressure feed-water heater 13.

Like this, by the feedwater of high-pressure feed-water heater 13 heating, process boiler feed pipe 14 guides to boiler 1, is heated once more to become steam.

; feed-water heaters such as low-pressure feed heater 10 or high-pressure feed-water heater 13 have forms such as vertical or horizontal; at heat power station; situation with horizontal-type feed water heater is more; so; hereinafter, be example with the situation of Horizontal Type High PressureFeedwater Heaters, with Figure 11 the general concise and to the point formation of feed-water heater is illustrated.

As shown in figure 11, feed-water heater is made of two parts of big hydroecium that separates 21 and body 22, is provided with tube sheet 25 between hydroecium 21 and body 22, and both separate.In hydroecium 21, at its downside, feed-water intake seat 23 is installed, side is equipped with feedwater outlet port 24 thereon, corresponding with it, the inside of hydroecium 21 separates and is two and is used to guide the space of the feedwater that flows into from feed-water intake seat 23 and is used to make the space of giving hydropexis of flowing out from feedwater outlet port 24, feedwater flows into from feed-water intake seat 23, is heated the back and is flowed out by feedwater outlet port 24.

On tube sheet 25, offer a plurality of pores that are communicated with it.These pores are being offered up and down symmetrically with respect to the horizontal plane at the vertical direction center by 25 of tube sheets, constitute top pore group and bottom pore group.Further, in being arranged at each pore of tube sheet 25, insert U-shaped heating tube 26 described later from body 22 sides, and fixing by welding etc.

As indicated above, the feedwater that flows in the hydroecium 21 from feed-water intake seat 23 flows into to the fixing U-shaped heating tube 26 of bottom pore group, and be directed to body 22 sides, after in body 22, heating, in the top pore group side process hydroecium 21 of tube sheet 25, flow out, flow to the outside of feed-water heater from feedwater outlet port 24.

In the inside of body 22, U-shaped heating tube 26 is setting along the total length of body 22, and its end is fixed in a plurality of pores of offering on the tube sheet 25.In addition, in Figure 11, for convenience, only show the part of U-shaped heating tube 26.Further,, be vertically installed with a plurality of heating tube gripper shoes 27, of the pore support of U-shaped heating tube by offering on these heating tube gripper shoes in the inside of body 22.

In addition, on body 22, on this tube sheet 25 top nearby, be provided with heating steam inlet seat 28, the heating steam of bleeding from steam turbine is by the inside that flows into body 22 here.Then, this heating steam is interior mobile through body 22 on one side, on one side and by carrying out heat exchange between the feedwater of flowing in the U-shaped heating tube, it is also condensing to be captured its heat energy, finally become condensed water, the condensation-water drain seat not shown in the figures that is provided with from tube sheet 25 body 22 nearby flows out.

The inside of the body 22 of Gou Chenging is divided into 3 parts from its function like this.That is to say that overheated portion 29, condensation part 30 and the condensed water cooling end 31 of returning arranged.Wherein, overheated return bottom roughly that portion 29 is arranged on superheated steam inlet seat 28 promptly, in the body 22 and tops tube sheet 25 adjacency.On the other hand, with the bottom of the body 22 of tube sheet 25 adjacency promptly, the overheated downside that returns portion 29, be provided with condensed water cooling end 31.The part that these that are provided with in the body 22 are overheated to be returned beyond portion 29, the condensed water cooling end 31 is condensation part 30.

Flow into the overheated heating steam of returning portion 29, the feedwater transmission in U-shaped heating tube 26 of its sensible heat part is flowed out after becoming saturated vapor roughly.At this moment, be higher than saturation temperature, make this heating steam become superheated steam, therefore overheatedly return heat transfer form in the portion 29, become the advection heat conduction along with the variation of phase owing to import this overheated temperature of returning the heating steam in the portion 29.This heat transfer form is when the steam flow rate of heat-transfer area is slow, and the thermal resistance resistance is big, and the heat exchanger effectiveness deterioration between feedwater.Therefore, return in the portion 29 overheated, be provided with snakelike stream, superheated steam vertically flows by this snakelike stream and U-shaped heating tube 26, and it is big that flow velocity becomes, and improved heat exchanger effectiveness.That is to say, return in the portion 29 overheated, heat-transfer pipe gripper shoe 27 is made the structure that an end that makes its vertical direction can not extend to the end of overheated bottom surface side that returns portion 29 or top surface side, and a side that does not extend to the end disposes several with differing from one another, forms snakelike stream.By adopting such formation, utilize the overheated portion 29 that returns, from the heating steam that heating steam inlet seat 28 flows into,, carry out heat exchange effectively on one side on one side by snakelike stream, the saturated vapor that becomes roughly flows out.

In the condensation part 30, the heating steam that becomes saturated vapor roughly is from the space between U-shaped heating tube 26 and the body 22, flows into and condensing to the heating tube group portion that a plurality of U-shaped heating tubes 26 compile formation.Here, owing to carry out heat exchange by the condensing of heating steam, so almost not variation of temperature, become certain substantially temperature.Thereby, can not cause convection current etc., the flow velocity of heating steam is compared with the overheated portion of returning, and is slow, the largest portion in occupation of feed-water heater in all.Further, near the center of condensation part 30,30 total length is provided with breather pipe 32 along the condensation part, and this breather pipe 32 is used to compile the non-condensing gases such as oxygen that produce along with the condensing of heating steam.One end of this breather pipe 32 is connected with the breather pipe outlet ports 33 that extend to body 22 outsides.In addition, on this breather pipe outlet port 33, also be connected with the pipeline that guides these non-condensing gases to low-pressure feed heater, deaerator, condenser etc.

Further specify the condensing appearance of heating steam of condensation part 30 here, with Figure 12.

Figure 12 is the sectional drawing of condensation part 30 of the body 22 of feed-water heater shown in Figure 11.In Figure 12, the structure identical with Figure 11 indicates identical symbol, and it describes omission in detail.U-shaped heating tube 26 shown in Figure 12 pools together by a plurality of, forms heating tube group 42, and this heating tube group 42 is divided into top heating tube group 42a and lower heating pipe group 42b, makes the laterally zygomorphic structure of center line with respect to the horizontal direction of body 22.In addition, near the central part of body 22, above-mentioned breather pipe 32 is being set.

Become the heating steam of saturated vapor roughly by the overheated portion of returning, import the gap of body 22 and pipe group 42, from the full week in this gap, in the inflow pipe group 42.The surface of U-shaped heating tube 26 in pipe group 42 by capturing its latent heat, the condensing condensed water that becomes saturation water roughly, is organized 42 inside through pipe same as before and is flowed down, and is trapped in the bottom of body 22.At this moment, in pipe group 42, condensing by heating steam descends the pressure at this position, thereby further heating steam is directed in the pipe group 42.So the central part of heating steam in pipe group 42 imports gradually, and be condensing repeatedly, final, become do not become condensed water non-condensing gas residue such as oxygen near the breather pipe 32 of central part.In breather pipe 32, offer the passage not shown in the figures that is used to attract non-condensing gas, non-condensing gas is retracted to the outside of feed-water heater from attracting here in breather pipe 32.At this, breather pipe 32 is described with Figure 13 and Figure 14.Figure 13 is arranged on the pattern diagram of the formation of the breather pipe 32 on the condensation part 30, and Figure 14 is the concise and to the point sectional drawing of breather pipe 32 shown in Figure 13.In addition, in Figure 13 and Figure 14, shared formation indicates shared symbol, and simultaneously, the formation identical with Figure 11 and Figure 12 indicates identical symbol, and it describes omission in detail.

As shown in figure 13, breather pipe 32 also is supported on the heat-transfer pipe gripper shoe 27, in its latter half the condensed water inflow is installed and prevents plate 44.This condensed water flows into and prevents plate 44, and the position of set passage covers passage on breather pipe 32, according to the number or the size of passage, is provided with like that shown in Figure 13 (a) or Figure 13 (b).In addition, as shown in Figure 4, this passage 45 is in the following half side left and right symmetrically setting of the horizontal direction center line of breather pipe 32, and condensed water flows into and prevents plate 44, covers these passage 45 ground from the position at the vertical direction center of breather pipe 32 and is being provided with.Flow into by this condensed water and to prevent plate 44, attached on this breather pipe 32, can not be attracted to the inside of breather pipe 32 from passage 45 from the condensed water of top.In addition, though not shown in the figures,, such situation is also arranged, promptly the foot at breather pipe 32 is provided with the condensed water tap, condensed water is attracted to the structure that can discharge in the breather pipe 32.

Here, about the size of passage 45, owing to determine the amount of the heating steam in the space that the heated support plate 27 of each condensation part 30 of inflow separates in advance, so, according to the amount of this heating steam, also can infer the amount of the non-condensing gas that produces in this space.Thus, determine the size of passage 45 according to this amount of inferring.Further, by in the way of breather pipe 32, throttle orifice being set, can adjust the influx of non-condensing gas.

So, the saturation water condensed water of condensing heating steam flows into to condensed water cooling end 31, through the internal flow of this condensed water cooling end 31, further its sensible heat is partly passed to feedwater in the U-shaped heating tube 26, after temperature reduces, flow out from condensation-water drain seat not shown in the figures.At this moment, also with overheated to return portion 29 same, become form in the heat transfer form of this condensed water cooling end 31 by convective heat transfer.Therefore,,, form snakelike stream, thus, in condensed water cooling end 31, also improved heat exchanger effectiveness by heat-transfer pipe gripper shoe 27 with overheated to return portion same in the inside of condensed water cooling end 31.

With Figure 15 this condensed water cooling end 31 is described here.Figure 15 is the perspective view of detailed structure of condensed water cooling end set on pattern ground expression feed-water heater body 22 Lower Halves and the C-C sectional drawing in this perspective view.In addition, in Figure 15, the formation identical with Figure 11 indicates identical symbol, and it describes omission in detail.In Figure 15,, U-shaped heating tube 26 shown in Figure 11 and heat-transfer pipe gripper shoe 27 are not shown for the convenience that illustrates.As shown in figure 15, condensed water cooling end 31, one end and tube sheet 25 are arranged on tube sheet 25 1 sides of bottoms in the body 22 with being connected, with condensed water cooling coaming plate 60, cover the condensed water cooling top board 63 of this condensed water cooling coaming plate 60 and the sealing plate 64 that is arranged between condensed water cooling coaming plate 60 and the body 22 is a main composition.This condensed water cooling top board 63 flatly is arranged on the approximate centre position of body 22 vertical direction, and its top is provided with the above-mentioned overheated portion that returns.

The downside with tube sheet 25 unconnected ends in the space that condensed water cooling coaming plate 60 and condensed water cooling top board 63 surround is provided with condensed water cooling end inlet 62, condensed water enters the mouth 62 from this condensed water cooling end, flows into the inside in the space of condensed water cooling coaming plate 60 and 63 encirclements of condensed water cooling top board.Then, one side is passed through this condensed water cooling coaming plate 60 and is cooled off the snakelike stream not shown in the figures of the interior volume setting of top board 63 encirclements with condensed water, carry out heat exchange on one side with through the feedwater of flowing in the set a plurality of U-shaped heating tubes not shown in the figures of this interior volume, temperature is reduced, arrive near the tube sheet 25 in this space.Then, the condensed water that this temperature reduces, the nearby set space outflow of condensed water cooling coaming plate outlet between condensed water cooling coaming plate 60 and body 22 not shown in the figures in end of cooling off tube sheet 25 sides of coaming plate 60 from condensed water.This space is separated by sealing plate 64, and the condensed water that temperature is reduced to design temperature collects in this space, and the condensation-water drain seat 61 set by side half side under the body flows out, and further is directed to low-pressure feed heater, deaerator, condenser etc.

Each structure of above-mentioned feed-water heater has in the past been considered to implement result's decision of Machinery Design to being suitable for of the steam turbine power station of the steam condition of foundation subcritical pressure boiler design.But the result of technological development in recent years shows that the output in steam condition and power plant thereupon, causes the capacity of feed-water heater also to maximize increasing.So reckoning with such tendency can continue from now on more.So the design aspect of the feed-water heater when increasing about such machine capacity will be considered the increase etc. of the degree of superheat of increase, the heating steam of feedwater flow.Wherein,, by increasing the radical of U-shaped heating tube, can bring up to a certain degree size to the Yang Cheng of condenser pump or boiler feed pump, perhaps can constitute the material that do not change the U-shaped heating tube or the machine of material for the increase of feedwater flow.

In addition, for the increase of the degree of superheat of heating steam, can adopt to enlarge the overheated countermeasure of returning the area of portion 29.But, under the situation that adopts this method, the shape of body 22 and hydroecium 21 is maximized.And, even the overheated area that returns portion 29 increases, because the pressure loss can make heating steam pass through the pipe group time also increases by this method thereupon, the result who obtains is, can not produce the condition of the heating steam of extracting out from the steam turbine of the heating steam pressure that reduces condensation part 30 fully.

Further, in condensation part 30, the radical of U-shaped heating tube 26 increases, it is big that the section configuration of pipe group 42 can become, thereupon, the distance of the central part of steam arrival pipe group 42 can be elongated, also can become big so pipe is organized the pressure distribution of 42 central parts on heating tube is axial, lost the reliability of the extraction of non-condensing gases such as oxygen.

In addition, at the condensed water cooling end, condensation-water drain seat 61 shown in Figure 15 be provided in the section horizontal direction center line of body 22 the lower part, be the bottom of condensed water cooling top board 63, and, because condensed water cooling coaming plate 60 seals with the space that condensed water cooling top board 63 surrounds, and therefore, such situation can take place, promptly in feed-water heater when beginning running etc., collect in condensed water cooling top board 63 air, other gas nearby and get rid of smoothly and have any problem.

The present invention In view of the foregoing proposes, and its objective is provides a kind of feed-water heater, and this feed-water heater can improve performance for the increase or the strict heating condition of station capacity.

The content of invention

For achieving the above object, the present invention takes following technical scheme:

A kind of feed-water heater, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute the heating tube group, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that

In the inside of described body, have the overheated portion that returns that forms by several vapor flow paths, this vapor flow path makes all of the steam that imports described body, flows along the length direction of described heating tube group, and the sensible heat of this steam is imposed on described feedwater.

The feed-water heater of being put down in writing is characterized in that, at the overheated central portion that returns portion, is provided with the inlet of two places heating steam, at the described overheated two ends of returning portion, the outlet of a described heating steam is set respectively.

A kind of feed-water heater, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

Cover this ventilation duct from the top along described ventilation duct, the short circuit that the described group of pipe up and down gap is divided into 2 spaces prevents plate.

A kind of feed-water heater, substantially be the inside of columnar body, along the length direction of described body, be equipped with a plurality of U-shaped heating tubes, on the section of described body, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange, the temperature of this feedwater is risen with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

From roughly being radial setting near the central part of the vertical cross section of described heating tube group and not setting 4 pipe group slot parts of described U-shaped heating tube; And

The short circuit that covers this ventilation duct along the length direction of described ventilation duct prevents plate,

Described short circuit prevents that the both ends of plate from inserting in 2 set on the described lower heating pipe group described pipe group slot parts.

A kind of feed-water heater, substantially be the inside of columnar body, along the length direction of described body, be equipped with a plurality of U-shaped heating tubes, on the section of described body, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange, the temperature of this feedwater is risen with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

Near the central part of the vertical cross section of described heating tube group, roughly be radial setting and be provided with 4 pipe group slot parts that set described U-shaped heating tube; And

Length direction along described ventilation duct is being provided with, and the one end inserts in 2 set on the described lower heating pipe group in the described pipe group slot part described pipe group slot parts, and 2 pieces of short circuits that the other end is connected with described ventilation duct prevent plate.

The feed-water heater of being put down in writing is characterized in that, in the gap of the described group of pipe up and down, is provided with vertical short circuit symmetrically and prevents plate on ventilation duct.

A kind of feed-water heater, substantially be the inside of columnar body, along the length direction of described body, be equipped with a plurality of U-shaped heating tubes, on the section of described body, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange, the temperature of this feedwater is risen with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

Position directly over described lower heating pipe group, the short circuit that sets along described ventilation duct prevents plate, this short circuit prevents that plate from flatly extending along described lower heating pipe group, and portion is provided with the chevron shape that covers described ventilation duct from the top in the central.

The feed-water heater of being put down in writing is characterized in that,

At the both ends in pipe group gap up and down, be provided with vertical short circuit in each end and prevent plate,

Prevent on the plate in described vertical short circuit, be provided with and be used for being trapped in the condensate draining pipe that short circuit prevents that the condensed water on the plate from discharging to the body bottom.

A kind of feed-water heater, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute the heating tube group, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that

Above the center of the lateral vertical side direction of described body, be provided with and be used to discharge the condensation-water drain seat that makes the condensing condensed water of described heating steam,

Be provided with the condensation-water drain guide plate of described condensed water in the inside of described body to described condensation-water drain seat guiding.

As the means that address the above problem, in the present invention, as put down in writing, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute the heating tube group, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that,, have the overheated portion that returns that forms by several vapor flow paths in the inside of described body, this vapor flow path flows all length directions along described heating tube group of the steam that imports described body, and the sensible heat of this steam is imposed on described feedwater.So, adopt such structure, the steam that imports each vapor flow path is cut apart, and direct into the overheated portion that returns, thereby, compare with the situation that whole steam are directed in the single vapor flow path, the pressure loss can be reduced significantly, heat exchanger effectiveness can be improved.

Further, as put down in writing, in the present invention, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that, also comprise: at the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group; Cover this ventilation duct from the top along described ventilation duct, the short circuit that the described group of pipe up and down gap is divided into 2 spaces prevents plate.So, by such structure, can prevent around the pipe group by pipe group gap up and down the direction of the set ventilation duct of the direct ingress pipe group of steam central portion, simultaneously, in top heating tube or the lower heating pipe group of also this vapor stream can being led once more, therefore, the delay of the heating steam in the heating tube group etc. is avoided.More successfully carry out condensingly, improved heat exchanger effectiveness.

Moreover, as put down in writing, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute the heating tube group, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that, above the center of the lateral vertical side direction of described body, be provided with and be used to discharge the condensation-water drain seat that makes the condensing condensed water of described heating steam, be provided with in the inside of described body the condensation-water drain guide plate of described condensed water to described condensation-water drain seat guiding.So, by adopting this structure, because the condensation-water drain seat is positioned at the top of condensed water cooling end, therefore, when the running in the power station begins etc., gases such as air can not be trapped near the top board of condensed water cooling end, thereby, even the condensed water cooling end also can turn round all the time under the prerequisite that does not reduce heat exchanger effectiveness.

Brief description of drawings

Fig. 1 is the overheated sectional drawing that returns portion of the present invention's first form of implementation.

Fig. 2 is the overheated perspective view that returns portion of the present invention's first form of implementation.

Fig. 3 is the sectional drawing of the feed-water heater body of the present invention's second form of implementation.

Fig. 4 is the A-A sectional drawing of Fig. 3.

Fig. 5 is the ideograph that short circuit prevents the various variation of plate.

Fig. 6 is the sectional drawing of the feed-water heater body of the present invention's second form of implementation.

Fig. 7 is that the B-B of Fig. 6 is to view.

Fig. 8 is the perspective view of the condensed water cooling end structure of the present invention's the 3rd form of implementation.

Fig. 9 is the front view of the condensed water cooling end structure of the present invention's the 3rd form of implementation.

Figure 10 is system's pie graph of heat power station in the past.

Figure 11 is the sectional drawing of the length direction of feed-water heater in the past.

Figure 12 is the transverse cross of feed-water heater in the past.

Figure 13 is the ideograph of the drainpipe of feed-water heater in the past.

Figure 14 is the sectional drawing of the drainpipe of feed-water heater in the past.

Figure 15 is the condensed water cooling end detailed maps of feed-water heater in the past.

The working of an invention form

Hereinafter, utilize accompanying drawing to describe each form of implementation of feed-water heater of the present invention.

Fig. 1 shows first form of implementation of feed-water heater of the present invention, is the vertical cross section figure of the length direction of feed-water heater body, shows the overheated formation of returning portion of feed-water heater especially, and Fig. 2 shows this formation by perspective view.In addition, in Fig. 1 and Fig. 2, common formation is with common symbolic representation, and the structural table identical with Figure 13 has identical symbol, and it describes omission in detail.

As shown in Figures 1 and 2, the feed-water heater of the present invention's first form of implementation, its overheated portion of returning also is arranged on tube sheet 25 1 sides of body 22 first halves.In Fig. 1 and Fig. 2, though not shown,,, allow the line part of U-shaped heating tube not shown in the figures run through the overheated portion that returns for the U-shaped heating tube that the roughly total length along feed-water heater is set is fixed on the tube sheet 25.

Overheated return between portion 29 and the body 22 is the space, and the overheated body 22 that returns above the portion 29 is provided with heating steam inlet seat 28.The heating steam that is used for heated feed water flows into from this heating steam inlet seat 28.At this, the heating steam of this inflow is that the level from steam turbine way not shown in the figures waits the gas of extracting out, becomes the big superheated steam of the degree of superheat here.Further, an end of heating steam inlet hot jacket tube 41 cylindraceous is fixed on the interior perimembranous of heating steam inlet seat 28, and the high heating steam of the degree of superheat that flows into from heating steam inlet seat 28 is directed to this heating steam inlet hot jacket tube 41.

In body 22, be provided with in heating steam inlet seat 28 and the overheated space of returning between the portion 29 with overheated and return the overheated portion's coaming plate 35 that returns that portion 29 is communicated with.The other end of heating steam inlet hot jacket tube 41 inserts this overheated upper part that returns portion's coaming plate 35, becomes the structure that allows 41 thermal expansions of heating steam inlet hot jacket tube.According to this structure, from of the heating steam of heating steam inlet seat 28, flow into the overheated inside of returning portion's coaming plate to 41 guiding of heating steam inlet hot jacket tube, be directed to the overheated portion 29 that returns.

Return in the portion 29 overheated,, be provided with to adjacency the overheated portions of the returning inlet 36 of observing essentially identical two positions of cross-sectional areas from heating steam inlet seat 28 at its central portion roughly.The overheated internal vertical of returning portion 29 be provided with a plurality of heating tube gripper shoes 27, the line part of a plurality of U-shaped heating tubes not shown in the figures passes the hole that wears on this heating tube gripper shoe 27 and is supported.

Here, being used in these heating tube gripper shoes 27 separates the heating tube gripper shoe 27 beyond the heating tube gripper shoe 27 of the overheated portion of returning inlet 36 of two positions of adjacency, only is fixed on overheated bottom surface one side or end face one side of returning portion 29.Here, in the heating tube gripper shoe 27 of adjacency, it is different to be fixed on an overheated end that returns portion 29, or is fixed on bottom surface one side or is fixed on end face one side, the non-closing structure that the other end adopts the steam that flows into to pass through.Like this, in this form of implementation, these heating tube gripper shoes 27 separate the overheated heating tube gripper shoe 27 of returning the overheated portion of the returning inlet 36 of two set positions of 29 substantial middle portions of portion with respect to being used to, and constitute two snakelike streams of left-right symmetry.And the overheated portion of returning outlet 39 is opened on the overheated top, two ends of returning portion 29.

According to this formation, flow into the overheated superheated steam that returns in portion's coaming plate 35, flow into roughly the same amount respectively from the overheated overheated portion of the returning inlet 36 that returns two set positions of 29 substantial middle portions of portion.Then, flow into the overheated big superheated steam of the degree of superheat that returns in the portion 29, such shown in Fig. 1 and Fig. 2 arrow, snakelike respectively the flowing of two streams that one side separates by heating tube gripper shoe 27, and it is mobile to both ends, between the feedwater that tube sheet 25 directions flow, carry out heat exchange on one side and in the overheated U-shaped heating tube not shown in the figures that returns in the portion 29 of process, feedwater is heated.So, flow into the overheated superheated steam that returns in the portion 29, captured its sensible heat, finally become the saturated center roughly that the degree of superheat diminishes, flow out from the overheated portion of returning outlet 39.

Here, as indicated above, these two vapor flow paths make with respect to the heating tube gripper shoe 27 symmetrical structures that are used to separate the set overheated portion of the returning inlet 36 of substantial middle portion, thereby, the flow resistance of vapor flow path is basic identical, and the pressure that exports 39 steam that flow out from the overheated portion of returning that is arranged on both ends is also basic identical.

Like this, in first form of implementation of the present invention, can pass through a plurality of streams by the overheated whole steam that return portion 29, thereby in the overheated rectification stream that returns in the portion 29, the increase of the flow velocity of steam is avoided, and has reduced the pressure loss.Here, in general, flow losses and flow velocity 2 times are proportional, thereby flow velocity reduces a half, and the pressure loss becomes 1/4.That is to say, use this form of implementation, do not change the pipe group shape of U-shaped heating tube not shown in the figures, allow the pipe group intersect vertically, the quantity of steam that passes through just can become half.Thus, can reduce the pressure loss of returning the steam of portion 29 by overheated significantly.

Further, by above describing in detail, through overheated return portion 29 after, in the condensation part of guiding heating steam, the vapo(u)rous temperature does not reduce, and becomes big with the temperature difference of feedwater in the U-shaped heating tube, therefore, can provide heat exchange characteristics good feed-water heater.

Here, in this form of implementation, the structure that adopts is, at the overheated overheated portion of returning of the substantial middle portion configuration inlet 36 that returns portion 29, the steam that flows into is arranged on the overheated portion of returning outlet 36 and flows out through symmetrical snakelike stream from both ends, but, the area of the straight length 11,12 of each stream shown in Figure 1 or the overheated portion of returning inlet 36 or the configuration of aperture position and heating tube gripper shoe 27 can be designed so that also the flow resistance of snakelike stream equates.In addition, about the number of stream, being 2 in this form of implementation, still, is also passable more than 3.About this structure, also can be according to determining to the temperature of the superheated steam of outlet and the thermal balance of the feed temperature in the U-shaped heating tube not shown in the figures of tube sheet 25 1 sides from the overheated portion of returning inlet.

Below, second form of implementation of feed-water heater of the present invention is described with Fig. 3 to Fig. 7.Fig. 3 (a) shows second form of implementation of feed-water heater of the present invention, be vertical cross section figure with respect to the feed-water heater body length direction of feed-water heater condensation part, Fig. 3 (b) is the enlarged diagram of ventilation duct 32 detailed structure shown in Fig. 3 (a), and Fig. 4 is the A-A sectional drawing of Fig. 3 (a).In addition, in Fig. 3, Fig. 4, common formation indicates common symbol, and the structure identical with Figure 11 to Figure 14 indicates identical symbol, and it describes omission in detail.

Shown in Fig. 3 (a), be equipped with a plurality of U-shaped heating tubes not shown in the figures in the inside of the body 22 of feed-water heater.This U-shaped heating tube is provided with a plurality of at certain intervals, passes set hole on several heating tube gripper shoes 27 shown in Figure 4, is being supported by this heating tube gripper shoe 27.The condensation part is made of several spaces that these several heating tube gripper shoes 27 separate.

In the condensation part, the U-shaped heating tube not shown in the figures shown in Fig. 3 oblique line constitutes heating tube group 42, and with respect to the center line of its horizontal direction, top heating tube group 42a and lower heating pipe group 42b become symmetrical structure.And, feedwater in the U-shaped heating tube not shown in the figures in the feed-water intake side inflow lower heating pipe group 42b not shown in the figures, the U-shaped portion of the U-shaped heating tube that does not show in the figure turns back, and is directed to top heating tube group 42a side same as before, is directed to above-mentioned heating not shown in the figures and returns portion.

On top heating tube group 42a and lower heating pipe group 42b,, be provided with near the radial and symmetrical nest of tubes groove slot part 47 of basic one-tenth its central portion in the position that does not dispose U font heating tube.The central portion in the group of the pipe up and down gap 48 between top heating tube group 42a and lower heating pipe group 42b is provided with the ventilation duct 32 that is used to suck non-condensing gas.At this, ventilation duct 32 total length along the condensation part on the feed-water heater length direction is extended, and simultaneously, is drawn out to the outside of feed-water heater, further is connected with the ventilation duct or the condenser of the feed-water heater of low-pressure stage by pipeline.

Shown in Fig. 3 (b), in a side of the latter half of ventilation duct 32, air vent 45 is being provided with symmetrically with respect to center line, with horizontal angle be angle θ 1.In addition, shown in Fig. 3 (a), the short circuit with chevron section configuration prevents that plate 46 from inserting this lower heating pipe group 42b and going up in two set pipe group slot parts 47, is setting with the form that covers these ventilation duct 32 tops.

Fig. 4 is the A-A sectional drawing of Fig. 3 (a) of this appearance of expression, and this short circuit prevents that plate 46 is being provided with along the roughly total length of ventilating board 32 length directions, with the U-shaped heating tube is not same among the figure, passes this heating tube gripper shoe 27, supports in the above.

In addition, air vent 45 is arranged on the latter half one side of ventilation duct 32, and is arranged in each space that this heating tube gripper shoe 27 separates according to some.Here, according to the water condition of giving in steam in the condensation part and the U-shaped heating tube not shown in the figures, determine the heat exchange amount in each space that heating tube gripper shoe 27 separates, thus, amount by means of the non-condensing gas that attracts from air vent 45 is determined heat exchange amount, thereby, based on this, can determine to be arranged on the configuration or the shape of the air vent 45 of ventilation duct 32.

According to this formation, become the heating steam of saturated vapor roughly through the above-mentioned overheated portion of returning, one side enters the space between heating tube group 42 and the body 22 above Fig. 3 (a) and body 22 shown in Figure 4, Yi Bian flow into the condensation part that several spaces that heating tube gripper shoe 27 separates constitute.In the condensation part, the heating steam of inflow is carried out heat exchange with the interior feedwater of flowing of process U-shaped heating tube, captures its latent heat and condensing, becomes condensed water.Condensing by means of this heating steam reduced the steam pressure at this position, can further add hot-air to internal feed from the periphery of heating tube group 42.

At this moment, the feed temperature in the U-shaped heating tube not shown in the figures of formation heating tube group 42 is at lower heating pipe group 42b place step-down, and heating tube group 42a place uprises on top.In addition, low voltage section such as the feed-water heater of ventilation duct 32 and low-pressure stage, deaerator, condenser is connected, and can successfully attract non-condensing gas.So, as a whole, in the condensation part, produce from the periphery of heating tube group 42 vapor stream to the central upper of bottom heating tube group 42b.

Here, heating tube group 42 U-shaped heating tube by mentioned earlier constitutes, thereby, between top heating tube group 42a and lower heating pipe group 42b, certainly existing pipe group gap 48 up and down.At this up and down in the pipe group gap 48, because the formation thing that does not hinder steam to flow, therefore, the vapor stream in above-mentioned heating tube group 42, also exist through this steam of flowing to its central part of pipe group gap 48 up and down.In this vapor stream, except from heating tube group 42 peripheries directly to the heating steam at center, the steam that also includes in the heating tube group 42a of top and flow out through pipe group gap 48 up and down in the lower heating pipe group 42b.

Because of preventing plate 46, short circuit hindered its stream to the steam that its central part flows in pipe group gap 48 up and down through this to central portion, thereby, can not be inhaled in the ventilation duct 32, but supply with also condensing to top heating tube group 42a or lower heating pipe group 42b.That is to say that this short circuit prevents that plate 46 is arranged to the space segmentation in pipe group gap 48 is up and down become to comprise the space of ventilation duct 32 and two spaces in the space beyond this space, prevents that steam from directly flowing into to ventilation duct 32.

So after heating steam was condensing, the non-condensing gas residue such as oxygen that are included in the heating steam were got off.At this, because the inside of ventilation duct 32 is low-pressure state, therefore, this non-condensing gas is attracted from the air vent 45 that ventilation duct 32 is provided with, and is retracted to the outside of feed-water heater body.So, in the condensation part, the condensing condensed water that becomes of heating steam, the non-condensing gases such as oxygen that are included in simultaneously in the heating steam are discharged effectively.

As indicated above, with second form of implementation of the present invention, in the condensation part, to the heating steam that central portion flows, can be directed to the inside of top heating tube group 42a or lower heating pipe group 42b through the group of the pipe up and down gap 48 in the gap of top heating tube group 42a and lower heating pipe group 42b.Thereby in the ventilation duct 32 as low voltage section, minimally has prevented from the not condensing heating steam of heating tube group 42 outside attractions.

By this short circuit being prevented plate 46 from making the structure that covers ventilation duct 32 tops, the condensed water that can prevent top heating tube group 42a generation is attached on the ventilation duct 32.Thus, adopt second form of implementation of the present invention, can provide heat exchanger effectiveness high feed-water heater.

In addition, in this form of implementation, as shown in Figure 3, short circuit prevents that plate 46 from bending to becomes the smooth surface structure above ventilation duct 32, still, also can adopt as Fig. 5 (a) to the various variation shown in Fig. 5 (d).Fig. 5 be only ventilation duct 32 and short circuit are prevented the position of plate 46 release expression, be used for representing that the short circuit that becomes smooth curved above ventilation duct 32 that is arranged on 2 pipe group slot parts 47 of ventilation duct 32 on the condensation part and insertion lower heating pipe group 42b shown in Figure 3 prevents the schematic diagram of the variation of plate 46.In addition, in the figure, the structure identical with Fig. 3, table has identical symbol, and it illustrates omission.

In the variation of Fig. 5 (a), short circuit is prevented plate 46 makes the bight on ventilation duct 32 tops curved shape.This variation has enlarged the group of the pipe up and down gap 48 in the gap as top heating tube group 42a and lower heating pipe group 42b shown in Figure 3, be adapted to the big situation in space that is provided with that short circuit prevents plate 46, adopt the formation shown in Fig. 5 (a), can further force down manufacturing expense, obtain and above-mentioned same effect.

In addition, also can not adopt the plate 46 that short circuit is prevented shown in Fig. 3 (a) to make the structure that insertion lower heating pipe group 42b goes up 1 piece of plate in 2 pipe group slot parts 47 that are provided with, but shown in 5 (b), 2 pieces of short circuits of inserting in the pipe group slot part 47 are prevented that plate 46 directly is fixed on the ventilation duct 32.

In this case, short circuit prevents the fixed position of plate 46 to ventilation duct 32, though near the center of ventilation duct 32 vertical direction, should be above air vent 45.Adopt this structure,, also can obtain and above-mentioned same effect as the narrow occasion in the group of the pipe up and down gap 48 in the gap of top heating tube group 42a and lower heating pipe group 42b.

Further, shown in Fig. 5 (c), except short circuit prevents plate 46, also can in the way in the group of the pipe up and down gap 48 shown in Fig. 3 (a), be set to vertical vertical short circuit and prevent plate 49.In Fig. 5 (c), this vertical short circuit prevents that plate 49 is provided with 2 pieces, and be arranged on ventilation duct 32 and short circuit prevent plate 46 about, left-right symmetry respectively.

Here, in Fig. 5 (c), though adopted short circuit to prevent plate 46 and further appended the structure that vertical short circuit prevents plate 49 at ventilation duct 32, but, be not limited thereto, also can prevent that with ventilation duct 32 shown in Fig. 5 (a) and short circuit the vertical short circuit of increase prevents plate 49 on plate 46 structures at Fig. 3 (a).Further, as required, can also increase piece number that this vertical short circuit prevents plate 49.

When constituting said structure, the vapor stream that flows to central portion by the group of the pipe up and down gap 48 shown in Fig. 3 (a), can be directed to top heating tube group 42a or lower heating pipe group 42b in the optional position of heating tube group 42, thereby, the delay of the steam in heating tube group 42 is avoided, condensing can more successfully carrying out improved heat exchanger effectiveness.

In addition, pipe group slot part 47 shown in Fig. 3 (a) is not set, also can adopt the formation shown in Fig. 5 (d), along lower heating pipe group 42b, horizontal direction short circuit is set prevents plate 46 directly over lower heating pipe group 42b, prevent that in this short circuit the central portion of plate 46 is provided with the chevron bend, prevent that with this short circuit plate 46 from covering the top of ventilation duct 32.By adopting this structure, the heating steam stream that flows to central portion through the group of the pipe up and down gap 48 shown in Fig. 3 (a) prevents from the chevron bend of plate 46 to make its stream bending by means of this short circuit, is directed in the heating tube group 42a of top.Moreover, be directed to the heating steam in the top heating tube group 42a shown in Fig. 3 (a), condensing in the heating tube group 42a of this top, become condensed water.Then, this condensing condensed water through flowing downward in the heating tube group 42a of top, is trapped in the horizontal part that the short circuit shown in Fig. 5 (d) prevents plate 46 according to former state, prevents that from this short circuit the end of plate 46 from flowing downward.

That is to say, by such short circuit being prevented plate 46 from making the structure shown in Fig. 5 (d), can obtain and above-mentioned same effect, and, the condensed water that produces in the top heating tube group 42a shown in Fig. 3 (a) can not flow downward in the lower heating pipe group 42b, therefore, lower heating pipe group 42b can not be subjected to the influence of the condensed water that flow down by top heating tube group 42a, the advantage of the heat exchanger effectiveness that can be improved.

Here, in the occasion of using this variation, the group of pipe up and down gap 48 shown in Fig. 3 (a) as the gap of top heating tube group 42a and lower heating pipe group 42b, prevent that by the short circuit shown in Fig. 5 (d) plate 46 from cutting apart, therefore, in the top heating tube group 42a shown in Fig. 3 (a) by non-condensing gas that condensing heating steam produced etc., by heating tube group 42 peripheral parts to bottom heating tube group 42b side shifting, from attracteding to air vent set on the ventilation duct 32 45 here.Thereby, as required, can prevent from tube connector 51 is set on the plate 46 in the short circuit shown in Fig. 5 (d), non-condensing gas is directly moved from top heating tube group 42a side direction lower heating pipe group 42b side.,, the condensed water that tube connector 51 is used for prevent flowing downward and be detained prevents plate 46 here for flowing into short circuit, thereby, wish that this tube connector 51 makes outstanding upward cylindrical duct.

Further, prevent the variation of plate 46, also can prevent that the both ends of plate 46 are provided with vertical short circuit and prevent plate and condensate draining pipe in short circuit about adopting the short circuit shown in figure Fig. 5 (d).Then, with Fig. 6 and Fig. 7 this situation is described.

Fig. 6 is a schematic diagram of removing the feed-water heater internal structure of the feed-water heater condensation part of expression after the U-shaped heating tube on the part of feed-water heater length direction, and Fig. 7 is that the B-B of Fig. 6 is to view.In addition, in Fig. 6 and Fig. 7, shared formation indicates shared symbol, and the structure identical with Fig. 3 to Fig. 5 indicates identical symbol, and it describes omission in detail.

As Figure 6 and Figure 7, in this variation, in body 22, also be equipped with a plurality of vertical heating tube gripper shoes 27.By this heating tube gripper shoe 27 a plurality of pores 43 are split up into top pore group 43a and bottom pore group 43b, these pores connect a plurality of shape heating tubes not shown in the figures, thus, in a plurality of spaces that separate by heating tube gripper shoe 27, constitute the condensation part set a plurality of U-shaped heating tubes not shown in the figures.

In addition, the short circuit that the along continuous straight runs that is provided with the chevron crooked position at central portion extends to heating tube group two ends prevents plate 46, setting along the condensation part Zone Full, supporting by heating tube gripper shoe 27, its horizontal part be in lower heating pipe group not shown in the figures directly over.And as shown in Figure 7, prevent from the central portion of plate 46 ventilation duct 32 to be set below the chevron crooked position in short circuit.In addition, prevent on the plate 46, the tube connector 51 that is directed to the bottom from top with non-condensing gas can also be set as required in short circuit.

Further, as Figure 6 and Figure 7, each vertical short circuit prevents that plate 49 is separately positioned on the two ends that short circuit prevents plate 46, thereby makes the group of pipe up and down gap-closing not shown in the figures.Here, prevent on the plate 49 in this vertical short circuit, be provided be used for will be trapped in short circuit prevent the condensate draining pipe 52 that the condensed water on the plate 46 is discharged to the bottom of body 2.As shown in Figure 6, this condensate draining pipe 52 is arranged near the both sides the heating tube gripper shoe 27, and its underpart is supported on this heating tube gripper shoe 27.

According to this formation, become the heating steam of saturated vapor roughly by the above-mentioned overheated portion of returning, from this overheated return portion around flow into the condensation part.Then, this heating steam flows into heating tube group not shown in the figures, constitutes the feedwater of flowing in the U-shaped heating tube not shown in the figures of this heating tube group with process and carries out heat exchange, and its latent heat is captured, and the condensing condensed water that becomes.So, by condensing heating steam, can reduce the steam pressure at this position, therefore, heating steam is imported the inside of heating tube group.Finally, non-condensing gases such as oxygen are attracted in the ventilation duct 32, and feed-water heater or deaerator, the condenser etc. of guiding low-pressure stage.Here, owing to adopted the structure of between top heating tube group and lower heating pipe group, not arranging the U-shaped heating tube, therefore, add hot-air and can flow directly into this up and down in the pipe group gap, but, this heating steam, by this up and down the short circuit in the pipe group gap prevent that the set vertical short circuit of plate 46 and two ends thereof from preventing that plate 49 is to top heating tube group or the guiding of lower heating pipe group.Further, the condensed water that produces in the heating tube group flows downward through this heating tube group, particularly, the condensed water that produces in the heating tube group of top flows to the top that this short circuit prevents plate 46 downwards, the end that prevents plate 46 from this short circuit is by condensate draining pipe 52 inside, to the bottom that drops to body 22.

So, by adopting this variation, can prevent from directly to attract heating steams from pipe group gap up and down to ventilation duct 32, simultaneously, the condensed water that produces in the heating tube group of top can be guided to the bottom of body 22, make it can not flow to lower heating Guan Zuzhong downwards, therefore, can be provided in the also very high feed-water heater of heat exchanger effectiveness in the lower heating pipe.In addition, at this moment, with the lower guide of condensed water, condensed water bottom line can be pressed onto with contacting of heating steam, heating, the again dissolving of non-condensing gas in condensed water etc. again of condensed water can be prevented to body 22 with condensate draining pipe 52.

The 3rd form of implementation of feed-water heater of the present invention hereinafter, is described with reference to Fig. 8 and Fig. 9.

Fig. 8 is the perspective view of the part of the set condensed water cooling end of the hydroecium side of feed-water heater body bottom of pattern ground expression the present invention the 3rd form of implementation, and Fig. 9 is the front view from positive this condensed water cooling end observed previously of Fig. 8.In addition, in Fig. 8 and Fig. 9, shared formation indicates common symbol, and simultaneously, the formation identical with Figure 11 Figure 15 indicates identical symbol, and it describes omission in detail.

As shown in Figure 8, in this form of implementation, also same with feed-water heater in the past shown in Figure 11, condensed water cooling end 31 is arranged on the bottom of condensed water cooling end top board 63, this condensed water cooling end top board 63 is connected with tube sheet 25, simultaneously, flatly be configured near the central part of vertical direction in the body 22, the space in the body 22 is divided into two parts up and down.And, in this form of implementation,, be provided with the condensation-water drain seat 61 that the condensed water of body 22 coolings is discharged to the feed-water heater outside in the center of body 22 vertical direction.This condensation-water drain seat is connected with deaerator or condenser not shown in the figures by pipe arrangement.

Bottom at condensed water cooling end top board 63, be connected with condensed water cooling end coaming plate 60, the line part of a plurality of U-shaped heating tubes not shown in the figures that are connected with tube sheet 25 passes this condensed water cooling end coaming plate 60 and is being provided with the inside of condensed water cooling end top board 63 encirclements.In the gap between this condensed water cooling end coaming plate 60 and body 22, be equipped with sealing plate 64.And, condensed water cooling end coaming plate 60 is same with condensed water cooling end 31 in the past shown in Figure 15, further extend to dead ahead shown in Figure 8 one side than sealing plate 64, the condensed water cooling end top board 63 on top that covers the condensed water cooling end coaming plate 60 of this extension extends to the end too, and the bottom of the condensed water cooling end coaming plate 60 of its end is provided with condensed water cooling end inlet.Further, the bottom of the condensed water cooling end coaming plate 60 between sealing plate 64 and tube sheet 25 is provided with condensed water cooling end coaming plate outlet 66.

By condensed water cooling end coaming plate 60 and the inside that condensed water cooling end top board 63 surrounds, be provided with several heating tube gripper shoes not shown in the figures, this heating tube gripper shoe supports above-mentioned U-shaped heating tube not shown in the figures with given configuration.Several heat pipe gripper shoes that these are not shown in the figures in its end, have only the bottom surface side of condensed water cooling end coaming plate 60 or any one party of condensed water cooling top board 61 sides alternately to fix.Thus, in the inside that condensed water cooling end coaming plate 60 and condensed water cooling top board 63 surround, the condensed water cooling end inlet from not shown in the figures that is separated by the heating tube gripper shoe that formation will be provided with exports 66 snakelike stream to condensed water cooling end coaming plate.

Further, in the side than the more close tube sheet 25 of sealing plate 64 positions, a horizontal end of condensed water cooling top board 63 is connected with body 22.The other end is not connected with body 22, but opening, but is provided with the condensation-water drain seat guide plate 65 that extends to sealing plate 64 from the tube sheet 25 that is used to close peristome.This condensation-water drain seat guide plate 65 makes the shape of rectangular plate bending roughly, is connected with tube sheet 25 and sealing plate 64 in the longitudinal direction, laterally is being connected on condensed water cooling top board 63 and the body 22.And the connecting portion of this condensation-water drain seat guide plate 65 and body 22 is in the upside of body 22 horizontal direction center lines, near the upper end for condensation-water drain seat 61.The detailed structure of this form and sealing plate 64, shown in Figure 9.

As shown in Figure 9, sealing plate 64 makes the sealing plate 64 that is installed in condensed water cooling end coaming plate 60 bottoms is overlapped with sealing plate 64 on being installed in body 22, and the structure that this coincidence part is linked together.And sealing plate 64 is arranged to close the gap that forms between condensed water cooling end top board 63, condensed water cooling end coaming plate 60, condensation-water drain seat guide plate 66 and the body 22.So, as Fig. 8 and shown in Figure 9, by means of sealing plate 64, between body 22 and condensed water cooling end top board 63, condensed water cooling end coaming plate 60 and condensation-water drain seat guide plate 65, form the space, this space is by means of the set water cooling portion of the coagulating coaming plate outlet 66 in condensed water cooling end coaming plate 60 bottoms, and the space that sets a plurality of U-shaped heating tubes not shown in the figures that surrounds with condensed water cooling end coaming plate 60 and condensed water cooling top board is communicated with.

According to Fig. 8 and formation shown in Figure 9, in the feed-water heater of this form of implementation, the cooling water of the condensing bottom that is trapped in body 22 in the condensation part flows into the condensed water cooling end 31 from condensed water cooling end inlet not shown in the figures.Then, the condensed water of this inflow, in the snakelike stream that the heating tube gripper shoe by not shown in the figures of the inside that process condensed water cooling end coaming plate 60 and condensed water cooling end top board 63 surround separates, and carry out heat exchange between the feedwater of flowing in the U-shaped heating tube not shown in the figures.So, through this snakelike stream carry out heat exchange captured condensed water that sensible heat flows again simultaneously arrive tube sheet 25 near, flow out from water quench portion coaming plate outlet 66, be directed to the space of condensed water cooling end coaming plate 60 bottoms that sealing plate 64 separates at this position opening.On condensation-water drain seat 61, connect deaerator or the further machine that reduces of condenser equal pressure by pipeline not shown in the figures, therefore, condensed water to the guiding of the bottom of the condensed water cooling end coaming plate 60 that separates by sealing plate 64, according to siphon principle, from flowing out by condensation-water drain seat 61 here.

In this form of implementation, owing to condensation-water drain seat 61 is arranged on the center of body 22 vertical direction, thereby, condensation-water drain is in the position perpendicular to condensed water cooling end top board 63, when the running beginning of power station, even be trapped at gases such as air under the situation in the space that condensed water cooling end coaming plate 60 and condensed water cooling end top board 63 surround, this gas also can compile and be trapped near the condensed water cooling end top board 63, and can successfully discharge, therefore, can not reduce the heat exchanger effectiveness in the condensed water cooling end 31, can provide performance higher feed-water heater.

In addition, in this form of implementation, condensation-water drain guide plate 65 is made of the shape of bending, therefore, at this position, can absorb the distortion that produces along with the thermal expansion of body 22 grades, can obtain the high structure of reliability.

Effect of the present invention:

As indicated above, feed-water heater of the present invention can improve overheated return section, condensation The heat exchanger effectiveness at section, each position of condensed water cooling end, thus can provide a kind of with respect to sending out Also can propose high performance feedwater under the increase of the capacity in power station or the strict heating steam condition adds Hot device.

Claims (9)

1, a kind of feed-water heater, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute the heating tube group, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that

In the inside of described body, have the overheated portion that returns that forms by several vapor flow paths, this vapor flow path makes all of the steam that imports described body, flows along the length direction of described heating tube group, and the sensible heat of this steam is imposed on described feedwater.

2, the feed-water heater of putting down in writing according to claim 1 is characterized in that, at the overheated central portion that returns portion, is provided with the inlet of two places heating steam, at the described overheated two ends of returning portion, the outlet of a described heating steam is set respectively.

3, a kind of feed-water heater, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

Cover this ventilation duct from the top along described ventilation duct, the short circuit that the described group of pipe up and down gap is divided into 2 spaces prevents plate.

4, a kind of feed-water heater, substantially be the inside of columnar body, along the length direction of described body, be equipped with a plurality of U-shaped heating tubes, on the section of described body, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange, the temperature of this feedwater is risen with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

From roughly being radial setting near the central part of the vertical cross section of described heating tube group and not setting 4 pipe group slot parts of described U-shaped heating tube; And

The short circuit that covers this ventilation duct along the length direction of described ventilation duct prevents plate,

Described short circuit prevents that the both ends of plate from inserting in 2 set on the described lower heating pipe group described pipe group slot parts.

5, a kind of feed-water heater, substantially be the inside of columnar body, along the length direction of described body, be equipped with a plurality of U-shaped heating tubes, on the section of described body, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange, the temperature of this feedwater is risen with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

Near the central part of the vertical cross section of described heating tube group, roughly be radial setting and be provided with 4 pipe group slot parts that set described U-shaped heating tube; And

Length direction along described ventilation duct is being provided with, and the one end inserts in 2 set on the described lower heating pipe group in the described pipe group slot part described pipe group slot parts, and 2 pieces of short circuits that the other end is connected with described ventilation duct prevent plate.

6, according to arbitrary feed-water heater of putting down in writing in the claim 1 to 3, it is characterized in that, in the gap of the described group of pipe up and down, on ventilation duct, be provided with vertical short circuit symmetrically and prevent plate.

7, a kind of feed-water heater, substantially be the inside of columnar body, along the length direction of described body, be equipped with a plurality of U-shaped heating tubes, on the section of described body, constitute that top heating tube group and lower heating pipe group clip up and down pipe group gap and the heating tube group of balanced configuration up and down, import the steam of described heating tube group, carry out heat exchange, the temperature of this feedwater is risen with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, it is characterized in that, also comprise:

At the central part of the vertical cross section of described heating tube group, the ventilation duct that is used to attract non-condensing gas that is provided with along described heating tube group;

Position directly over described lower heating pipe group, the short circuit that sets along described ventilation duct prevents plate, this short circuit prevents that plate from flatly extending along described lower heating pipe group, and portion is provided with the chevron shape that covers described ventilation duct from the top in the central.

8, the feed-water heater of putting down in writing according to claim 7 is characterized in that,

At the both ends in pipe group gap up and down, be provided with vertical short circuit in each end and prevent plate,

Prevent on the plate in described vertical short circuit, be provided with and be used for being trapped in the condensate draining pipe that short circuit prevents that the condensed water on the plate from discharging to the body bottom.

9, a kind of feed-water heater, substantially be the inside of columnar body, length direction along described body, be equipped with a plurality of U-shaped heating tubes, constitute the heating tube group, import the steam of described heating tube group, carry out heat exchange with the feedwater of flowing in the described a plurality of U-shaped heating tubes of process, the temperature of this feedwater is risen, it is characterized in that

Above the center of the lateral vertical side direction of described body, be provided with and be used to discharge the condensation-water drain seat that makes the condensing condensed water of described heating steam,

Be provided with the condensation-water drain guide plate of described condensed water in the inside of described body to described condensation-water drain seat guiding.

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