• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a nuclear reactor capture solution injector (32) that can inject a deposition solution from ambient temperature into a high temperature, high pressure feedwater line. It is ensured that the deposition solution is supplied at a location within the feedwater pipe that is beyond a boundary layer of the flowing water to prevent spreading of the solution and to prevent deposition of the deposition solution within the injector. The axial cross-sectional profile of the injector and the position of an injection slot on the injector can reduce the turbulence of the feedwater into the injector to further reduce injector clogging.
    公开号:CH706005B1
    申请号:CH02934/12
    申请日:2012-12-21
    公开日:2016-12-30
    发明作者:A Caine Thomas；M Mistreanu Adrian；A Seeman Russell
    申请人:Ge-Hitachi Nuclear Energy Americas Llc；
    IPC主号:
    专利说明:

    Field of the invention
    The invention relates to a system for supplying a deposition solution at ambient temperature to a high-temperature high-pressure feedwater flow line, with which it is ensured that the deposition solution is fed to a location within the feedwater, which is beyond the boundary layer of the flowing water to prevent excessive separation of the solution on a feedwater pump directly below an injection valve and to prevent separation of the solution within the injection valve, which causes clogging of the faucet.
    Related Technology
    In a nuclear reactor, plating solutions are often injected into a high temperature / pressure feed water line to deposit materials on reactor surfaces. In particular, as shown in FIG. 1, hydrogen injection 2 may be used to inject hydrogen into a feedwater suction line 4b (the suction line 4b is the inlet to the feedwater pumps 10) to act as an oxygen scavenger for the water circulating in the reactor 8 , In connection with the hydrogen injection 2, a noble metal (e.g., platinum) plating solution injection system 6 may be used to inject a plating solution into the feedwater discharge line 4a to deposit platinum ions on surfaces of the reactor 8. Although Fig. 1 illustrates a BWR configuration 8, it will be understood that other types of nuclear reactors may also make use of deposition solution injections (such as the platinum plating solution described herein). The platinum plating solution may be, for example, a platinum salt solution of sodium hexahydroplatinate (Na 2 Pt (OH) 6). By injecting the solution into the feedwater drain 4a, platinum ions can be deposited on surfaces of the reactor 8 such that the platinum can act as a catalyst in reacting the injected hydrogen with oxygen molecules that may be present in the reactor. By reacting hydrogen with oxygen molecules on surfaces of the reactor 8, water (H2O) molecules can be generated. This reaction potentially reduces and eliminates oxygen molecules that may be present on surfaces of the reactor 8 that may otherwise promote corrosion of metal components, thus extending the useful life of reactor components.
    As shown in Fig. 2, a conventional injector configuration 12 for the plating solution may include a chemical charging carriage 24 which supplies a plating solution to the feedwater discharge conduit 4a. The chemical loader normally delivers the chemical deposition solution at a flow rate of about 50-120 cm 3 / min and a pressure of typically less than 8,62 MPa (1250 psi) (via positive displacement pumps). A chemical feed line 26 may deliver the plating solution from the chemical loading carriage 24 to the injection cock 20. One or more injector valves 14 may be inserted into the chemical feed line 26 to provide isolation of the plating solution in the chemical feed line 26. Normally, a conduit 16 is located at the outlet of valve 14. A welding member 18 may connect the injection valve 20 to the conduit 16 and the feedwater drain 4a.
    Since a distal end of a conventional injection cock 20 may extend only to an inner surface of the feedwater discharge conduit 4a, deposited material 22 may form within the end of the injection cock 20. The deposited material 22 may form at the injection point 6 when the deposition solution at the ambient (ie, low) temperature with the penetrating vortex flow of the high-temperature high-speed feedwater (in the range between about 115 ° C and 215 ° C with a flow rate of about 3 to 3). 6 m / s), which may cause the plating solution to break down into platinum ions which are then deposited within the distal end of the injection cock 20 (note that sodium hexahydroxyplatinate, Na 2 Pt (OH) 6, at temperatures of about 150 -260 ° C begins to decay). The obstruction of the injection valve 20 caused by the deposited material 22 may cause the positive displacement pumps to increase the injection pressure to provide the fixed injection flow rate. The pressure may increase to the design pressure of the injector configuration 12, resulting in the completion of an injection before the entire deposition solution has been injected. This can lead to a reduced amount of platinum itself, which is deposited in the reactor 8. Furthermore, blockage of the injection faucet 20 may prevent execution of the next scheduled injection (which is normally done once a year) or may require an unplanned reactor shutdown to remove the clog.
    In addition to the clogging of the injection valve 20 by deposited material 22 within the injection points 6, a distribution of the deposited material 22 along the inner surfaces of the feedwater line 4a may occur because the slowly flowing deposition solution does not dissolve out of the boundary layer and into the main flow of the feedwater can penetrate. The spreading may cause significant amounts of the platinum ions to deposit on the inside of the feed water line where they are not needed or desired, thereby also reducing the amount of platinum reaching the reactor 8. Thus, the object of the present invention is to alleviate clogging of the injector and distribution of the deposited material along the inner surfaces of the feed water line.
    Brief description of the invention
    The invention provides a system for injecting a plating solution into a high pressure / high temperature feedwater line. The system ensures that the deposition solution is injected outside the boundary layer of fluids passing through the feedwater line and into the associated main flow of fluids. By injecting the deposition solution outside the boundary layer, blockage of the injector and distribution of the deposited material along the inner surfaces of the feedwater line can be alleviated.
    Brief description of the drawings
    The above and other features and advantages of the invention will become more apparent from the detailed description of exemplary embodiments with reference to the attached drawings. The accompanying drawings are intended to depict the exemplary embodiments and are not to be construed as limiting the intended scope of the claims. The accompanying drawings are not to be considered as drawn to scale, unless expressly stated.<Tb> FIG. 1 <SEP> is a perspective view of a conventional BWR including deposition solution injection;<Tb> FIG. 2 <SEP> is a cross-sectional view of a conventional configuration of a deposition solution injector;<Tb> FIG. 3 <SEP> is a cross-sectional view of a configuration of a deposition solution injector according to an exemplary embodiment;<Tb> FIG. 4A <SEP> is a cross-sectional view of a distal end of an injector according to an exemplary embodiment, and FIGS<Tb> FIG. 4B <SEP> is an axial cross-sectional view A-A of the injector of FIG. 4A.
    Detailed description of the invention
    Detailed exemplary embodiments are disclosed herein. However, specific structural and functional details disclosed herein are presented for purposes of describing example embodiments only. However, exemplary embodiments may be embodied in many alternative forms and should not be interpreted as limited only to the embodiments illustrated herein.
    Accordingly, while exemplary embodiments may have various modifications and alternative forms, embodiments thereof are shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that there is no intention to limit example embodiments to the specific forms disclosed, but on the contrary, exemplary embodiments are intended to cover all modifications, equivalents, and alternatives that fall within the scope of exemplary embodiments. Like numbers refer to like elements throughout the description of the figures.
    It should be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element could be called a second element and, analogously, a second element could be called a first element without departing from the scope of the exemplary embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
    It is understood that when designating an element as "connected" or "connected" with another element, it may be directly connected to the other element or connected to this or that intermediate elements may be present. Conversely, if one element is labeled as "directly connected" or "directly connected" to another element, there are no intermediary elements. Other words used to describe the relationship between elements must be similarly interpreted (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).
    The terminology used herein is for the purpose of describing only particular embodiments, and is not intended to limit example embodiments. As used herein, the singular forms "a / a" and "this / that" are intended to include plural forms, unless the context clearly indicates otherwise. It is also to be understood that the terms "comprising," "comprising," "including," and / or "including," as used herein, but not indicating, the existence of the specified features, integers, steps, operations, elements, and / or components exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.
    It should also be noted that in some alternative implementations the functions / acts may occur out of the order referred to in the figures. For example, two figures shown in succession may in fact be executed substantially simultaneously or may sometimes be executed in reverse order, depending on the functionality / actions involved.
    FIG. 3 is a cross-sectional view of a configuration of a deposition solution injector 32 according to an exemplary embodiment. FIG. The injector configuration 32 includes a hollow injector tube 30 having a distal end 30a that extends beyond the inner surface of the feedwater conduit 4a. In particular, the distal end 30a of the injector 30 may extend outside of a detected boundary layer of the main flow of fluids flowing through the feed water line 4a. The depth of the boundary layer (and the required length X of the distal end 30a of the injector 30) may vary depending on the temperature and velocity of the feedwater. The depth of the boundary layer may also vary depending on the type of fluid flowing in the feedwater conduit 4a (of potentially varying viscosity), the diameter and material of the feedwater conduit 4a, and other parameters known to increase the Reynolds number (and the resulting depth of the Boundary layer) of the fluid flowing in the feedwater line 4a. It is therefore understood that the length X should at least be long enough so that it extends beyond the boundary layer of the fluid flowing in the feedwater line 4a.
    The configuration 32 of the deposition solution injector also includes a pipe stub 16a having an inner diameter that corresponds to or slightly exceeds the outer diameter of the injector 30. This pipe stub 16a provides assistance in minimizing vibration stresses in the injector 30 caused by feedwater flow forces.
    The inner diameter of the injector 30 may also contribute to potential plugging by deposited material as the deposition material is heated to high temperatures as it flows to the distal end 30a of the injector 30. For this reason, the inner diameter of the injector 30 should be made sufficiently small, which ensures that the deposition solution flows rapidly through the hot area adjacent to the feedwater line 4a. For a 50-120 <3> / min flow rate of the deposition solution through the injector 30, an inside diameter of about 3.2 mm (1/8 inch) of the injector 30 results in flow rates of about 7.6-2.2.9 cm / s (3-9 inches / s). This would result in the deposition solution staying in the hot zone for less than a second, ensuring that the deposition solution does not decay in that short time.
    4A is a cross-sectional view of a distal end 30a of an injector 30 according to an exemplary embodiment. The injector 30 is provided with an injection slot 30b located on a side behind the injector (more specifically, the injector slot 30b is downstream of the feedwater flow passing over the distal end 30a of the injector 30). By placing the injection slot 30b on the downstream side of the injector 30, the slot 30b is protected somewhat from the high pressure flow of the feedwater, thereby reducing the potential for clogging the injector 30 with deposited material.
    The injector should be sized to ensure that the entire injection slot 30b extends beyond the boundary layer of the flowing feedwater, just as the distal end 30a of the injector should extend beyond the boundary layer (as in FIG. 3) described). This ensures that the plating solution is completely injected into the main flow of the feedwater in the feedwater line 4a without experiencing unnecessarily high deposition of platinum ions on the inside of the feedwater line 4a. For this reason, the length Y (the injector length from the inner surface of the feedwater pipe 4a to the opening of the injection slot 30b) must extend beyond the boundary layer of the feedwater. As described in FIG. 3, the depth of the boundary layer may vary depending on the temperature and velocity of the feedwater, the type of fluid flowing in the feedwater line, the diameter and material of the feedwater line, and so forth. For example, for a feed water conduit 4a having a diameter of about 40 cm (16 inches) with flowing water, it is in a range of about 460-610 cm / s at a temperature of about 125-215 ° C, a length Y of about 2.5 cm (1 inch) adequately ensure that the entire injection slot 30b extends beyond the boundary layer of fluids flowing in the feed water conduit 4a.
    The size of the injection slot 30b itself can also influence the blockage of the injector 30. Therefore, the cross-sectional area of the injection slot 30b should be sized to ensure that the exit velocity of the plating solution is approximately equal to the velocity of the feedwater flow, ensuring that the eddy currents of the feedwater do not enter the injection slot 30b and cause deposition and possible clogging.
    The injection slot 30b may be located at a distance below the true distal end 30a of the injector 30 to protect the injection slot 30b from the high pressures of the feedwater flow. However, the distal end 30a of the injector 30 must not extend too far beyond the depth of the feedwater interface. Because the distal end 30a of the injector does not extend too far beyond the location of the boundary layer, bending and damage to the injector 30 can be avoided by the high velocity of the feedwater flow. Therefore, the length X (the entire length of the distal end 30a of the injector extending within the feed water conduit 4a) may not be more than about 20% greater than the required length Y.
    Fig. 4B is an axial cross-sectional view A-A of the injector 30 of Fig. 4A. As discussed in FIG. 4A, the injection slot 30b is located on a downstream side of the injector 30 (downstream side means downstream in the feed water flow direction). The axial cross-sectional profile 30c of the injector may be tapered oval with two pointed ends (as shown in Figure 4B) to hydrodynamically reduce the feedwater fluid forces that may occur at the interface between the injection slot 30b and the main flow of feedwater. The injection slot 30b may be located on the downstream end of the injector 30 (as shown in Fig. 4B). The axial cross-sectional profile 30c may also be circular, square, or other shape as long as the injection slot 30b is on the downstream side of the injector 30 to minimize turbulence of the incoming feedwater that may enter the injector 30.
    权利要求:
    Claims (7)
    [1]
    A system for injecting a plating solution into a high temperature feedwater line, comprising:a feedwater conduit adapted to direct a flow of fluid through the conduit,an injector having an injection slot at a distal end of the injector, the injector extending into the feedwater line and configured to inject a plating solution into the feedwater line,wherein the length of the injector extends from the inner surface of the feed water conduit to the opening of the injection slot at the distal end of the injector beyond an operational depth of the boundary layer of the flow of fluid through the feedwater conduit;wherein the injection slot is located on a downstream side of the injector relative to a flow direction of fluid through the feedwater line.
    [2]
    The system of claim 1, wherein an axial cross-section of the injector is oval with pointed, tapered ends, the injection slot being on one of the pointed, tapered ends.
    [3]
    3. System according to claim 1, wherein an axial cross section of the injector has a circular shape.
    [4]
    The system of claim 1, wherein an overall length of the portion of the injector that extends into the feedwater line is no more than 20% greater than the operating depth of the boundary layer of fluid flow through the feedwater line.
    [5]
    5. The system of claim 1, wherein a cross-sectional area of the injection slot is sized to cause, in operation, a flow rate of the deposition solution exiting the injection slot to be approximately equal to a flow rate of fluid flow through the feedwater conduit.
    [6]
    A reactor system comprising a system according to claim 1 for injecting sodium hexahydroxy platinate as a deposition solution, and a nuclear reactor connected to the feedwater line and located downstream of the injector.
    [7]
    The reactor system of claim 6, further comprising: a chemical load carriage having positive displacement pumps connected to the injector.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US13/340,918|US10290381B2|2011-12-30|2011-12-30|Method and apparatus for a high-temperature deposition solution injector|
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