JP2012037175A - Deaerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deaerator of single barrel type capable of subjecting feed water and steam to rectangular contact and enhancing deaeration efficiency even when being disposed on the under side of a feed water supply part which supplies feed water from the above side to a water storage part in a barrel.SOLUTION: The feed water supply part 3 includes: a feed water ejector 31 which ejects feed water from the above side to the water storage part 6; and a regulator which directs the feed water ejected from the feed water ejector 31 to a horizontal direction center part perpendicular to the axial direction of the barrel, a steam supply part 4 is configured to have a plurality of steam jetting unit groups 43 in the axial direction of the barrel 2, each steam jetting unit group 43 includes a plurality of steam jetting units which jet steam into the water storage part, in the horizontal direction perpendicular to the axial direction of the barrel 2 and the ejection means constituting the ejector group is arranged by setting a distance of a gap from the lower end position of each ejector to a barrel inner peripheral surface of the vertical direction lower side into the distance where the feed water can flow, and the ejector is prevented from being located on the horizontal direction center part vertical to the axial direction of the barrel 2.

Description

  The present invention relates to a deaerator for removing dissolved oxygen contained in feed water and supplying it to a steam generator such as a boiler.

  In a thermal power plant, a nuclear power plant, and the like, a deaerator that removes dissolved oxygen in the feed water is used in order to suppress corrosion of the components of the plant due to dissolved oxygen in the feed water.

  Two types of deaerators are known: a so-called twin-bottle type deaerator and a so-called single-cylinder type deaerator. The twin-bottle type deaerator has a deaeration part and a water storage part separately, and steam is added to the water supply made into a mist in the deaeration part to remove dissolved oxygen, and the deaerated water supply is stored in the water storage part. It is. In addition, the single cylinder type deaerator has a deaeration part and a water storage part coexisting in one body, and adds bubbled steam to the water supply stored in the water storage part to remove dissolved oxygen in the water supply. Is.

An example of a conventional single cylinder deaerator will be described with reference to FIG.
The single-body deaerator 101 has a horizontally long cylindrical body 102, and includes a water supply supply unit 103 and a steam supply unit 104 on the head side of the body 102, and a water supply outlet 105 on the bottom side of the body 102. I have.

  The water supply unit 103 includes a spray nozzle 131 and an introduction port 132 that introduces water to the spray nozzle 131, and water storage that is formed in the body 102 by spraying the water introduced from the introduction port 132 with the spray nozzle 131. It sprays and supplies to the part 106.

  The steam supply unit 104 also includes a steam inlet pipe 141 that introduces steam, a steam header 142 that is connected to the steam inlet pipe 141 and extends in the axial direction of the body 102, and extends from the steam header 142 toward the water storage unit 106. The water storage unit 106 includes a spray pipe 143 having a large number of openings, and stores steam from an external device such as a steam turbine (not shown) through the steam inlet pipe 141, the steam header 142, and the spray pipe 143. It supplies in the part 106. FIG.

  In the deaerator 101 having such a configuration, the steam from the opening portion of the spray pipe 143 is jetted into the water supply (water storage) of the water storage unit 106 as water bubbles, and the water is supplied with a wide contact area of the bubbles ( It comes into direct contact with water storage) and heats and degass oxygen contained in the water supply (storage water). Steam as air bubbles obtained by heating and degassing oxygen from the water supply (storage water) rises in the water storage section 106 and reaches the steam space section 107 in the upper part of the fuselage 102. Here, the steam from the spray nozzle 131 of the water supply supply section 103 Direct contact with sprayed mist-like water supply, and oxygen contained in the water supply is heated and degassed. Oxygen and accompanying steam separated from the feed water by deaeration are discharged to the outside through an air outlet (not shown) provided in the upper part of the body 2. In addition, the deaerated water supply is discharged from the water supply outlet 105 and sent to equipment in the plant that requires deaerated water.

  In this way, the conventional single-cylinder deaerator heats and degass oxygen contained in the feed water, and the plant components caused by dissolved oxygen prevent corrosion. Such conventional single cylinder type deaerators are disclosed in Patent Document 1 and Patent Document 2, for example.

  Furthermore, as shown in FIG. 7, there is also known a single cylinder type deaerator in which a partition plate 108 is provided in the water storage unit 106 and the water storage unit 106 is divided into a counter flow region 161 and a counter flow region 162. The single cylinder deaerator shown in FIG. 7 is the same as the single cylinder deaerator shown in FIG. 6 except that a partition plate is provided. The partition plate 108 is provided so that a gap 109 is formed below, and the counterflow region 161 and the counterflow region 162 communicate with each other through the gap 109.

  In the single-cylinder deaerator shown in FIG. 7, by providing the partition plate 108, the water supply supplied from the spray nozzle 131 to the water storage section 106 flows downward in the counterflow region 161 due to the force of the spray. , Facing the vapor as rising bubbles. Further, after the water supply passes through the gap 109 below the partition plate 108, it flows in the counterflow region 162 in the axial direction of the body 102, and is in orthogonal contact with the vapor as rising bubbles.

  Water supply and steam are more likely to cause turbulent flow of water when they are in orthogonal contact than when they face each other, and the turbulent flow increases the frequency of contact between steam and water as bubbles and increases deaeration efficiency. . That is, in the single cylinder type deaerator shown in FIG. 7, by providing the partition plate 108, an orthogonal contact region 162 where the water supply and the steam are orthogonally contacted is created to improve the deaeration efficiency.

Japanese Patent Laid-Open No. 11-351507 Japanese Patent No. 3684192

  However, in the single cylinder type deaerator in the prior art shown in FIGS. 6 and 7, the flow of the water supply sprayed from the spray nozzle 131 to the water storage unit 106 is downward in the downward direction of the spray nozzle 131. For this reason, the water supply flowing downward and the vapor as the rising bubbles are opposed to each other below the spray nozzle 131. Therefore, the deaeration efficiency is not sufficient below the spray nozzle 131. For example, when a deaerator is used in a large plant, the body needs to be very long in order to increase the deaeration capability. Problems arise in terms of the installation location of the vessel and the production cost of the deaerator.

  Therefore, even in the lower part of the water supply part that supplies water to the water storage part in the fuselage from above, the water supply and the steam can be brought into orthogonal contact with each other, so that the degassing efficiency can be improved. The purpose is to provide a ventilator.

  In order to solve the above-described problems, in the present invention, a fuselage having a water storage part for storing water supply therein, a water supply supply part that is provided on the upper part of the fuselage and that jets water supply to the water storage part, and In the deaerator having a steam supply unit for supplying steam to the water storage unit and a water supply outlet unit for discharging the water supply provided at the bottom of the body, the water supply unit supplies water to the water storage unit from above. Water supply jetting means, and regulating means for directing the water supplied from the jetting means to a central portion in the horizontal direction perpendicular to the axial direction of the fuselage, and the steam supply part is in the water storage part The steam jetting means group is configured to have a plurality of steam jetting means groups in the axial direction of the fuselage provided with a plurality of steam jetting means for jetting steam in a horizontal direction perpendicular to the axial direction of the fuselage, and constitute the jetting means group Each jet means The gap between the lower end position of the outlet means and the circumferential surface of the fuselage in the lower vertical direction is set to a distance through which the water supply can flow, and the jetting means is orthogonal to the axial direction of the trunk. It is not located in the center in the horizontal direction.

  Thereby, the water supply sprayed by the water supply spraying means is sprayed in the vicinity of the center in the direction orthogonal to the axial direction of the fuselage, the spraying direction of which is regulated by the pre-made means, and then descends in the vicinity of the fuselage center, When it reaches the lower end, it rises along the inner peripheral surface of the fuselage. At this time, since the steam jetting means is not provided near the center in the horizontal direction orthogonal to the axial direction of the fuselage, the water supplied from the steam jetting means by the steam jetting means is the axial direction of the fuselage 2. The steam jetting means does not prevent the steam jetting means from descending in the vicinity of the center in the orthogonal direction, and the steam jetting means indicates that the water supply rises along the inner peripheral surface of the fuselage due to the presence of the gap. Will not interfere.

  That is, below the steam jetting means, the water supply flows along the inner peripheral surface of the fuselage, that is, flows substantially horizontally. Accordingly, since the steam and the water supply are in contact with each other substantially orthogonally below the steam jetting means, the oxygen contained in the water supply can be heated and degassed with high efficiency. Furthermore, since a plurality of the steam ejection means groups are provided in the direction orthogonal to the axial direction of the body, that is, along the flow of the feed water, the feed water contacts the steam with high efficiency in the flow, and the deaeration efficiency is improved. Can be increased.

Moreover, it is preferable to set the distance of the gap from the lower end position of each of the jetting means constituting the jetting means group to the circumferential surface of the fuselage in the vertical direction below the same.
Thereby, it can accelerate | stimulate that the said water supply flows along the internal peripheral surface of a trunk | drum through the said clearance gap.

Further, the plurality of jetting means constituting the jetting means group may be arranged in line symmetry with a horizontal center line orthogonal to the axial direction of the body as an axis.
Thereby, the water supply which flowed how can contact with a vapor | steam equally, and the nonuniformity of deaeration can be eliminated.

  In addition, the water storage section includes a partition plate that divides the water storage portion into two regions in the axial direction of the body, and the partition plate is disposed with a gap in the lower portion, and the two regions communicate with each other through the gap. The water supply supply unit is arranged to supply water supply to only one of the two regions, and the water supply outlet unit is a region different from the region where water supply is supplied from the water supply supply unit. It is good to be arranged.

  According to the present invention, water supply and steam can be brought into orthogonal contact with each other even below the water supply supply unit that supplies water to the water storage unit in the fuselage from above, and the deaeration efficiency can be improved. A torso type deaerator can be provided.

It is a schematic cross-sectional view which shows the single cylinder type deaerator in an Example. It is AA sectional drawing in FIG. It is sectional drawing of the direction orthogonal to the axial direction of the trunk | drum of another example of a water supply part. It is a B direction arrow line view in FIG. It is a C direction arrow directional view in FIG. It is a schematic cross-sectional view showing an example of a conventional single-cylinder deaerator. It is a schematic cross-sectional view which shows another example of the conventional single cylinder type deaerator.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

First, the structure of the deaerator of this invention is demonstrated using FIG.1 and FIG.2.
FIG. 1 is a schematic cross-sectional view showing a single cylinder type deaerator in the embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

  A single-body deaerator 1 of the present invention has a horizontally long cylindrical body 2, and includes a water supply supply unit 3 and a steam supply unit 4 on the head side of the body 2, and a water supply on the bottom side of the body 2. A water supply outlet portion 5 is provided at a position away from the supply portion 3 in the axial direction of the body 2.

  The water supply unit 3 includes a plate-like member 33 to which a large number of spray nozzles 31 are attached, an introduction port 32 for introducing water supply into the upper space 36 of the plate-like member 33, and a guide 35. The plate-like member 33 is partitioned at both ends in the axial direction of the body 2 by a partition plate 34, and both ends in the direction orthogonal to the axial direction of the body 2 are attached to the inner wall of the body 2 as shown in FIG. The upper space 36 of the member 33 is a closed space. Moreover, the spray nozzle 31 sprays and supplies the water supply supplied from the inlet 32 to the upper space 36 to the water storage section 6 formed in the body 2 in the form of a mist. The guide 35 regulates the spraying direction of the feed water sprayed by the spray nozzle 31, and the feed water sprayed from the spray nozzle 31 by the guide 35 is near the trunk center in the direction orthogonal to the axial direction of the trunk 2. Sprayed on.

  The steam supply unit 4 includes a steam inlet pipe 41 for introducing steam, a steam header 42 connected to the steam inlet pipe 41 and extending in the axial direction of the body 2, and extending from the steam header 42 toward the water storage unit 6. And a plurality of spray pipe groups 43 arranged in the axial direction of the body. The spray pipe group 43 is composed of a plurality (six in this embodiment) of spray pipes 43a, 43b,. That is, the steam supply unit 4 supplies steam from an external device such as a steam turbine (not shown) into the water storage unit 6 through the steam inlet pipe 41, the steam header 42, and the spray pipe group 43.

As shown in FIG. 2, the spray pipe group 43 includes a plurality of spray pipes 43a, 43b,... 43f in a direction orthogonal to the axial direction of the body 2 (six in the present embodiment shown in FIG. 2). Each of the spray pipes 43a, 43b,... 43f is configured so that the distances d between the lower ends of the spray pipes 43a, 43b,... 43f and the inner surface of the body 2 on the lower side in the vertical direction are all the same. Is provided. Further, near the center of the direction perpendicular to the axial direction of the fuselage 2 (the range represented by a in FIG. 2 / the vapor bubbles ejected from the spray pipe collide with the vapor bubbles ejected from the adjacent spray pipe, coalesce, and the bubble size is spray pipe largely become not scope and range interval plus the width f ₁ of the range and downflow is provided) is not provided.

  Further, the water storage section 6 is provided with a partition plate 8, and the water storage section 6 is divided into a counter flow region 61 and a counter flow region 62 by the partition plate 8. The partition plate 8 is provided so that a gap 9 is formed below, and the counterflow region 61 and the counterflow region 62 communicate with each other through the gap 9.

In such a deaerator 1, in the counterflow region 61, the water supplied from the spray nozzle 31 is sprayed in the vicinity of the fuselage center in the direction orthogonal to the axial direction of the fuselage 2 with the spraying direction regulated by the guide 35. Is done. Then, water supply as it is lowered to the body around the center as shown in f ₁ in FIG. When the water supply reaches the lower end of the fuselage 2, it rises along the inner peripheral surface of the fuselage 2 as indicated by f ₂ → f ₃ in FIG.

At this time, the spray pipes constituting the spray pipe group 43 are not provided in the vicinity of the center in the direction orthogonal to the axial direction of the body 2 shown by a in FIG. The sprayed water supply does not interfere with the lowering of the vicinity of the center in the direction orthogonal to the axial direction of the body 2 (flow of f ₁ shown in FIG. 2).

  Further, since the plurality of spray pipes 43 are provided so that the distances d between the lower ends of the spray pipes 43 and the inner surface of the body 2 on the lower side in the vertical direction are all the same, the spray pipes 43 are formed of the body 2. The formation of the flow along the inner peripheral surface of the water supply is promoted by making the distance d uniform without obstructing the flow along the inner peripheral surface of the water supply.

  On the other hand, the steam from the opening of each of the spray pipes 43a, 43b,... 43f forming the spray pipe group 43 is bubbled into the water supply (water storage) of the water storage unit 6, and the wide contact of the bubbles. In direct contact with the water supply (storage water) by area, the oxygen contained in the water supply (storage water) is heated and degassed. At this time, the steam is ejected downward from each of the spray pipes 43a, 43b,... 43f and then rises, so that a vertical flow is formed. On the other hand, below each spray pipe 43a, 43b,... 43f, the water supply flows along the inner peripheral surface of the body 2 below the spray pipe as shown in FIG. .

  Therefore, since the steam and the water supply are in contact with each other substantially orthogonally below the spray pipes 43a, 43b,... 43f, the oxygen contained in the water supply can be heated and degassed with high efficiency. Furthermore, since a plurality of spray pipes 43a, 43b,... 43f are provided in the direction perpendicular to the axial direction of the body 2, that is, along the flow of the water supply (six in the example of FIG. 2), the water supply flows. It is possible to contact the steam with high efficiency and improve the deaeration efficiency.

  In addition, when the steam as bubbles obtained by heating and degassing oxygen from the water supply (storage water) rises in the water storage section 6 and reaches the steam space section 7 in the upper part of the body 2, the spray nozzle of the water supply supply section 3 here The mist-like water sprayed from 31 is directly contacted, and oxygen contained in the water is heated and deaerated. Oxygen and accompanying steam separated from the feed water by deaeration are discharged to the outside through an air outlet (not shown) provided in the upper part of the body 2.

  That is, according to the present embodiment, the steam and the water supply can be brought into contact with each other even in the counterflow region 61 in a nearly orthogonal state, and deaeration with high efficiency is possible.

Further, in the counterflow region, the water supply passes through the gap 9 below the partition plate 8 and flows in the axial direction of the body 2, and is heated and deaerated while being orthogonally contacted with the vapor as rising bubbles. . In the counterflow region, steam and feed water are in orthogonal contact with each other, so high efficiency degassing is possible.
The water supply deaerated in the counter-current region and the counterflow region is discharged to the outside from the water supply outlet 5 and sent to other equipment that requires the degassed water for use.

  In the present invention, even under the spray nozzle 31 that atomizes and sprays the feed water, the steam and the feed water can be brought into contact with each other in a nearly orthogonal state, so that the deaeration efficiency can be improved.

  In addition, the water supply part 103 is not restricted to the form shown in FIG. 6, FIG. 7, It can also be set as another form. An example of another form of the water supply unit 103 will be described with reference to FIGS. 3-4 is a figure which shows another form of a water supply part, FIG. 3 is sectional drawing of the direction orthogonal to the axial direction of the fuselage | body 2, and corresponds to the upper part of FIG. 2, FIG. FIG. 5 is a view in the direction of arrow B in FIG. 3, and FIG. 5 is a view in the direction of arrow C in FIG.

The water supply unit 3 ′ includes a body 2 to which six spray nozzles 31 ′ are attached, a header 36 ′ for storing water supply and supplying the spray nozzle 31 ′, and an inlet 32 for introducing water supply to the header 36 ′. 'And a guide 35'. In the water supply unit 3 ′ as shown in FIGS. 4 to 3, the water supplied from the introduction port 32 ′ is temporarily stored in the header 36 ′, and is supplied to the water storage unit 6 in the body 2 from each spray nozzle 31 ′. Sprayed toward. At this time, the guide 35 ′ is regulated so that it is sprayed in the vicinity of the center of the body in the direction orthogonal to the axial direction of the body 2.
The form of the water supply unit 3 ′ as shown in FIGS. 4 to 3 is suitable for supplying a large amount of water supply, and is suitable for the supply amount of the water supply, that is, the processing amount of the deaerator 1. It is good to select the form.

  A single-cylinder type deaerator that can make the feed water and steam orthogonally contact with each other even below the feed water supply unit that supplies feed water to the water storage unit in the fuselage from above. Can be used as

DESCRIPTION OF SYMBOLS 1 Deaerator 2 Body 3 Water supply part 4 Steam supply part 5 Water supply outlet part 6 Water storage part 8 Partition plate 9 Gap 31 Spray nozzle (water supply ejection means)
35 Guide (regulatory means)
43 Spray pipe group (steam jetting means group)
43a-43f spray pipe (steam ejection means)

Claims (4)

A fuselage having a water storage part for storing water supply therein, a water supply supply part provided at an upper part of the fuselage for ejecting water supply to the water storage part, a steam supply part for supplying steam to the water storage part of the fuselage, and the fuselage A deaerator having a water supply outlet provided at the bottom of the water supply for discharging the water supply,
The water supply unit has water supply jetting means for jetting water from above into the water storage part, and regulating means for directing the water jetted from the water supply jetting means toward a horizontal central portion orthogonal to the axial direction of the fuselage. And
The steam supply section has a plurality of steam ejection means groups, each having a plurality of steam ejection means for ejecting steam into the water storage section in a horizontal direction orthogonal to the axial direction of the fuselage, in the axial direction of the fuselage. Configured,
The jetting means constituting the jetting means group are arranged by setting the distance of the gap from the lower end position of each jetting means to the body circumferential surface below the vertical direction to the distance through which the water supply can flow. In addition, the deaerator is characterized in that the jetting means is not located in a horizontal central portion orthogonal to the axial direction of the body.   The deaerator according to claim 1, wherein a distance between a lower end position of each of the jetting means constituting the jetting means group and a peripheral surface of the trunk in the vertical direction is set to be the same.   3. The deaeration according to claim 1, wherein the plurality of ejection means constituting the ejection means group are arranged symmetrically with respect to a horizontal center line orthogonal to the axial direction of the body. vessel. A partition plate that divides the water reservoir into two regions in the axial direction of the body;
The partition plate is arranged with a gap in the lower part, and the two regions communicate with each other through the gap.
The water supply unit is arranged to supply water to only one of the two regions,
The deaerator according to any one of claims 1 to 3, wherein the water supply outlet is arranged in a region different from a region where water is supplied from the water supply unit.

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