CN2195686Y - Dryer for steam generator - Google Patents

Abstract

The utility model discloses a dryer for a steam generator, which comprises a separator, wherein, the separator is composed of vertical corrugated plate rings which are uniformly arranged along the circumferential direction. A steam counterpoising hole plate is arranged at the sides of inlets of the corrugated plate rings, and a supporting plate is arranged between the steam counterpoising hole plate and the corrugated plate rings. A top plate is arranged on the corrugated plate ring and the upper ends of the uniform steam hole plates, and an annular water collecting tank is arranged at the lower ends of the corrugated plate rings, wherein, the inner part of the annular water collecting tank is provided with a steam blocking plate which divides the water collecting tank into a big front chamber and a small rear chamber. The front chamber, the rear chamber and a bottom plate outside the water collecting tank are all provided with drainage pipes, and each of the drainage pipes is guided into water space of an evaporator. The dryer has the advantages of reasonable structure, strong separating capacity and good drainage effect. The utility model can be used in evaporators in nuclear power plants and stream drum boilers in power plants.

Description

Dryer for steam generator

The utility model relates to a kind of water separator, is a kind of presurized water reactor natural circulation steam generator drier specifically.

The water separator of presurized water reactor natural circulation steam generator is made up of coarse separator and thin separator.Thin separator claims drier again, and it is to prevent that steam from taking the wet last line of defense that divides out of.From the steam water interface of heating surface bank after crude separation and Gravity Separation, steam also carries the fine liquid particles of some, drier can separate these fine liquid particles, promptly moist steam is carried out " drying ", steam generator outlet saturated steam wetness is met be lower than 0.25% set quota, to guarantee the operation of nuclear power unit safety economy ground.Drier generally includes the separator of being made up of vertical corrugated sheet and is located at the hydrophobic structure of this separator lower end.Concerning drier, not only require vertical corrugated sheet separator to have good carbonated drink separating property, and require hydrophobic structure in time and effectively will divide dried up dredging away.Experimental study thinks that hydrophobic structure has a significant impact the service behaviour of drier, the design of hydrophobic structure and separator no less important.The GNPS dress comprises water leg with the hydrophobic structure of French 55/19B type steam generator drier, in the middle of water leg, adorn a dividing plate, with four support plates bulkhead bracket is got up, make it to throw off 50mm with the water leg base plate, throw off 2mm with vertical corrugated sheet lower end, the water leg side plate exceeds corrugated sheet lower end 75mm, forms forward and backward threshold, and drain pipe is contained in an end of water leg.Test shows that the hydrophobic effect of this hydrophobic structure is very poor.Its reason is: have two gaps up and down at dividing plate, because corrugated sheet has certain resistance, part steam will be in the water leg short circuit, be that steam is not flowed through corrugated sheet and flowed away from the gap, the gap of vapor stream above excessively makes that branch on the corrugated sheet is dried up can not to flow into water leg smoothly, flows through following gap, can blow afloat the water that flows into water leg and take away, the wet branch of corrugated sheet outlet steam is increased.

The purpose of this utility model provides a kind of rational in infrastructure, and separating power is strong, the steam generator drier that hydrophobic effect is good.

The utility model is achieved in that a kind of steam generator drier, it comprises the separator of being made up of vertical corrugated sheet and is located at the hydrophobic structure of this separator lower end, wherein said separator is radially placed along the circumferential evenly distributed corrugated sheet circle of forming by one group of vertical corrugated sheet, the entrance side of corrugated sheet circle is equipped with the equal steam vent plate of cylindrical shape, this orifice plate and corrugated sheet arrival end distance are 30～40mm, the top of corrugated sheet circle and equal steam vent plate is provided with the circular seal top board, all between steam vent plate and corrugated sheet circle annular horizontal supporting plate is housed, said hydrophobic structure comprises the annular collecting vat that is located at corrugated sheet circle lower end, its width is the distance of equal steam vent plate to the corrugated sheet circle port of export, an annular steam baffle is housed in annular collecting vat, before water leg is divided into, latter two chamber, and make the width L of front chamber ₁Greater than the width L of rear chamber ₂, being respectively equipped with drain pipe on the base plate of two chambers of water leg and water leg outside, and introducing the hydrospace of steam generator, retaining vapour box is equipped with in the outlet of drain pipe.

In this drier, moist steam flows through vertical corrugated sheet group through equal steam vent plate level, flows to the outside by the inboard, the water that is separated is formed moisture film and is flowed downward along wooden partition, be provided with water leg in corrugated sheet circle lower end, dried up to collect branch, the hydrospace of water being introduced steam generator with drain pipe.Vertical corrugated sheet to increase circulation area, reduces vapor (steam) velocity along circumferentially evenly distributed, improves separating effect.Water leg has two chambers and respectively hydrophobic separately, has thoroughly solved the steam short circuit problem that French hydrophobic structure exists, and can guaranteeing branchs, dried up to go into water leg interference-free, and the water of avoiding steam flow to have separated is taken away again, so has good hydrophobic effect.In inlet steam speed is 0.8～1.0m/s, and inlet steam humidity is under 5～6% the condition, and this drier can guarantee that the saturated steam wetness of steam generator outlet is lower than 2.5%.

Now in conjunction with the accompanying drawings and embodiments the utility model is done specific descriptions:

Fig. 1 is a steam generator dryer configuration schematic diagram;

Fig. 2 is the partial enlarged drawing of Fig. 1;

Fig. 3 is the A-A view of Fig. 1;

Fig. 4 is vertical circular arc corrugated sheet schematic diagram;

Fig. 5 is hydrophobic structure provided by the utility model and domestic similar hydrophobic structure comparative test result schematic diagram;

Fig. 6 is hydrophobic structure provided by the utility model and external similar hydrophobic structure comparative test result schematic diagram;

Ordinate exports hydrophobic amount G for the corrugated sheet group among Fig. 5 and Fig. 6, and kq/h, abscissa are air velocity w, m/s.

As Fig. 1, Fig. 2 and shown in Figure 3, a kind of steam generator drier comprises separator of being made up of vertical corrugated sheet 2 and the hydrophobic structure that is positioned at these separator 2 lower ends, and said separator 2 is radially placed along the circumferential evenly distributed corrugated sheet circle of forming by one group of vertical corrugated sheet.Entrance side at corrugated sheet circle 2 is equipped with the equal steam vent plate 3 of cylindrical shape, all steam vent plate 3 is 30～40mm with corrugated sheet circle 2 arrival ends distance, the top of corrugated sheet circle 2 and equal steam vent plate 3 is provided with circular seal top board 1, all steam vent plate 3 and 2 on corrugated sheet circle are equipped with annular horizontal supporting plate 4, said hydrophobic structure comprises the annular collecting vat 6 that is located at corrugated sheet circle 2 lower ends, its width is the distance of equal steam vent plate 3 to corrugated sheet circle 2 ports of export, an annular steam baffle 5 is housed in the water leg 6, water leg 6 is divided into former and later two chambers, and makes the width L of front chamber ₁Width L greater than rear chamber ₂, L ₁: L ₂=2:1, the corrugated sheet lower end is bearing on support plate 4, steam baffle 5 and the water leg 6.Be respectively equipped with drain pipe 10,9 and 8 on the base plate 7 of front chamber, rear chamber and water leg 6 outsides of water leg 6, each drain pipe is all introduced the hydrospace of steam generator, at drain pipe 10,9 and 8 retaining vapour box 11 is housed.In this drier, equal steam vent plate 3 is the inlet steam load evenly, improves separating effect.Top board 1 is by " drying " in order to guarantee moist steam to flow through the corrugated sheet group.At drain pipe 10,9,8 outlet dress retaining vapour boxes 11 is in order to prevent that upwards steam withstands on the drain pipe outlet even flows into drain pipe, to guarantee the hydrophobic hydrospace that successfully flows into of drier.When steam load and humidity were excessive, vapor stream is crossed the corrugated sheet group can take more water droplet out of, and bigger water droplet will drop on the base plate 7 of water leg 6 outsides, adorn drain pipe 8 here, can dredge these water.The extension of drain pipe 9,8 can and become a drain pipe, and introduces the hydrospace of steam generator, in the outlet of this drain pipe retaining vapour box 11 is housed.Parts all in this drier are all made with stainless steel.In the present embodiment, adopt vertical circular arc corrugated sheet to form separator 2, vertical circular arc corrugated sheet wave pitch b=35mm highly is no more than 500mm, width L=115mm, mean pitch a=10mm, (see figure 4); The corrugated sheet group can be arranged the 2-3 circle, and the number of turns of corrugated sheet group is determined according to steam load.The steam load distribution of the vapor space is relevant below position and the drier of circle and circle, and the vapor (steam) velocity that should guarantee the corrugated sheet group during design makes that separating effect is identical substantially everywhere about equally.The maximum water depth that water leg 6 height h should calculate greater than hydraulics, adjacent two drain pipes 10 or 9 distance dependents in maximum water depth and inlet steam humidity, drain pipe 9,10 circulation areas and the same chamber, increase drain pipe 10 and 9 radicals, water leg 6 height h can reduce; Drain pipe 10,9 and 8 is along arranging evenly that circumferentially each drain pipe should have enough hydrophobic abilities, and is in time hydrophobic to guarantee, its actual internal area is determined according to hydrophobic amount and drain pipe resistance; Drain pipe outlet should be below the lowest water level that the steam generator water level fluctuation may reach 200mm at least.

Fig. 5 provides this drier hydrophobic structure and domestic similar hydrophobic structure and France, the Soviet Union, Italian similar hydrophobic structure comparative test result respectively with Fig. 6.The hydrophobic structure of the nuclear power station steam generator drier of domestic design is to be provided with the porous hydrophobic base plate above water leg, 5 dividing plates are housed in the water leg constitute " labyrinth ", its result of the test is shown in curve A among Fig. 5, and curve B is this drier hydrophobic structure result of the test.Address before the hydrophobic structure of France, the Soviet Union is hydrophobic with the water leg of a sky, and gondola water leg is equipped with lath anyhow, but is the supporting that is used for corrugated sheet.Their result of the test represents with curve A, B, C respectively that in Fig. 6 curve D is this drier hydrophobic structure result of the test.Test is carried out on water-air test platform.Export hydrophobic amount by the metering experiment part, promptly taken out of the corrugated sheet group and drop on moisture on the base plate, determine its hydrophobic effect by air-flow.Export the separating effect that hydrophobic amount has also characterized drier, it is little to export hydrophobic amount, good separating effect; Otherwise it is big to export hydrophobic amount, inferior separating effect.Contrast test shows that the service behaviour of this drier hydrophobic structure is better than domestic and international similar hydrophobic structure greatly.

In the utility model, also can form separator with vertical buckle corrugated sheet, promptly above-mentioned hydrophobic structure both can be used for vertical circle arc corrugated sheet separator, also can be used for vertical buckle corrugated sheet separator, all can guarantee smoothly hydrophobic and can gas blowby, reach similar hydrophobic effect.The utility model can be used for nuclear power station steam generator, also can be used for thermal power station's dum boiler.

Claims (2)

1, a kind of steam generator drier, it comprises separator of being made up of vertical corrugated sheet (2) and the hydrophobic structure that is located at this separator (2) lower end, it is characterized in that said separator (2) radially placed along the circumferential evenly distributed corrugated sheet circle of forming by one group of vertical corrugated sheet, the entrance side of corrugated sheet circle (2) is equipped with columnar equal steam vent plate (3), this orifice plate (3) is 30～40mm with corrugated sheet circle (2) arrival end distance, the top of corrugated sheet circle (2) and equal steam vent plate (3) is provided with circular seal top board (1), all between steam vent plate (3) and corrugated sheet circle (2) annular horizontal supporting plate (4) is housed, said hydrophobic structure comprises the annular collecting vat (6) that is located at corrugated sheet circle (2) lower end, its width is the distance of equal steam vent plate (3) to corrugated sheet circle (2) port of export, an annular steam baffle (5) is housed in water leg (6), before water leg (6) is divided into, back two chambers, and make the width L of front chamber ₁Greater than the width L of rear chamber ₂Be respectively equipped with drain pipe (10), (9) and (8) on the base plate (7) of two chambers of water leg (6) and water leg (6) outside, retaining vapour box (11) is equipped with in the hydrospace that steam generator is introduced in drain pipe (10), (9) and (8), the delivery port in drain pipe (10), (9) and (8).

2, according to the said a kind of steam generator drier of claim 1, it is characterized in that said separator (2) arranges that by vertical circular arc corrugated sheet 2～3 circles form, height≤the 500mm of vertical circle arc corrugated sheet, width L=115mm, wave pitch b=35mm, mean pitch a=10mm, the width L of front chamber of said water leg (6) ₁With the width L of rear chamber ₂Than being L ₁: L ₂=2:1.

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