Water supply device for preventing vaporization of economizer of million-second reheat unit

Abstract

The application discloses a water supply device for preventing vaporization of a coal economizer of a million secondary reheating unit, which comprises an outlet header of the coal economizer, wherein the outlet header is connected with the coal economizer, the outlet header is provided with a water inlet, the outlet header is further provided with an outlet, the water inlet is provided with a pipeline which extends into the outlet header, and an opening of one end of the pipeline which is located outside the outlet header is provided with a connecting boss; a water inlet assembly comprises a water inlet pipe which is connected with the connecting boss, and an annular cavity is formed between the water inlet pipe and the pipeline; when the coal economizer is not completely filled with water and local vaporization occurs in the outlet header after heat exchange, pressure generated by the vaporization pushes an annular disc to move in an axial direction, and the annular disc further drives a moving ring, a rotating ring and a spherical body to deflect, so that manual monitoring is not needed, and once vaporization pressure in the outlet header increases, the water supply device can automatically open a channel to supply water.

Description

Technical Field

[0001] This invention relates to the field of economizers, and in particular to a water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit. Background Technology

[0002] To further adapt to the peak-shaving requirements of the power grid, explore the economic benefits of the electricity spot market, and investigate the lower limit of unit peak-shaving, how to minimize unit load during off-peak hours and improve the stable operation of units under low load conditions is a difficult problem for thermal power units. The main limiting factor for deep peak-shaving of power plant 1MW units (especially below 350MW load) is the low feedwater flow rate at low loads, which easily causes economizer vaporization. When the economizer vaporizes, the feedwater flow rate drops suddenly, leading to boiler MFT (Mechanical Fuel Turbine Default) and causing steam to enter the water-cooled walls, which disrupts hydrodynamic stability and endangers the safety of the water-cooled walls.

[0003] The economizer is divided into two parts: the front and rear walls. Feedwater enters the economizer inlet via two separate streams into the economizer inlet headers on both walls. From the economizer outlet headers, two separate downcomers lead to the bottom headers of the water-cooled walls. The main economizer is located at the very top of the boiler, where heat is concentrated. Because the feedwater enters the economizer via two separate streams, uneven distribution of feedwater at low flow rates causes a deviation in water flow within the economizers. The side with lower feedwater flow (often the rear side vaporizes first) is not completely filled with water (even if the water tank is full when the boiler is filled, water cannot be released from the economizer outlet vent valve). This results in localized vaporization after heat exchange, which gradually develops into "vapor resistance," eventually expanding the vaporization area. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is that when the feed water flow rate is low, the feed water is unevenly distributed, causing a deviation in the water flow rate in the front and rear economizers. The side with a smaller feed water flow rate (often the rear side vaporizes first) is not completely filled with water in the economizer (even if the water storage tank is full when the boiler is filled with water, the air vent valve at the economizer outlet cannot release water), resulting in local vaporization after heat exchange.

[0007] To solve the above technical problems, the present invention provides the following technical solution: a water supply device for preventing the vaporization of the economizer in a million-kilowatt double reheat unit, comprising an economizer outlet header connected to the economizer, the outlet header being provided with a water inlet, the outlet header also being provided with an outlet, the water inlet being provided with a pipe extending into the outlet header, and the end of the pipe located outside the outlet header being provided with a connecting boss.

[0008] The water inlet assembly includes a water inlet pipe, which is connected to a connecting boss, and an annular cavity K is formed between the water inlet pipe and the pipeline;

[0009] The water inlet pipe is provided with a through channel, a spherical groove is provided in the channel, a sphere is provided in the spherical groove, and a through hole is provided in the sphere. One end of the water inlet pipe is connected to the water inlet, and the other end is connected to the water delivery pipe.

[0010] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: an annular disk is provided in the annular cavity K, the outer side of the annular disk is slidably connected to the inner side of the pipe, and the inner side of the annular disk is slidably connected to the outer side of the water inlet pipe.

[0011] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: a cylindrical groove is provided on the side of the spherical groove, a rotating shaft is provided outside the sphere, the rotating shaft is rotatably connected to the cylindrical groove, and the axis of the rotating shaft is perpendicular to the axis of the through hole;

[0012] The water inlet pipe is provided with a first annular groove, which intersects with the cylindrical groove. A rotating ring is provided in the first annular groove, and an end face gear is provided on the end face of the rotating ring. A spur gear is provided at one end of the rotating shaft, and the end face gear meshes with the spur gear.

[0013] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: a second annular groove is further provided in the water inlet pipe, the second annular groove intersects with the first annular groove, and a movable ring is provided in the second annular groove, the movable ring being sleeved outside the rotating ring;

[0014] The rotating ring has a spiral groove on its outer side, and the moving ring has a boss on its inner side, with the boss embedded in the spiral groove.

[0015] A first spring is provided between the movable ring and the end face of the second annular groove near the rotating shaft.

[0016] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: a strip groove is provided on the outside of the water inlet pipe, and the strip groove is connected to the second annular groove;

[0017] A frustum is provided on the outer periphery of the moving ring, and the frustum is embedded in the strip groove; a radial spring groove is provided on the inner side of the second annular groove, a limit pin is provided in the spring groove, a second spring is provided between the limit pin and the bottom of the spring groove, and the frustum is provided with a limit hole that penetrates radially along the moving ring.

[0018] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit as described in this invention, a reset rod is provided in the limiting hole;

[0019] A limiting groove is formed inside the limiting hole, and a limiting platform is provided on the part of the reset rod located in the limiting groove. A third spring is provided between the limiting platform and the end face of the limiting groove near the center of the moving circle.

[0020] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: a radial circular hole is provided on the inner side of the annular disk, and one end of the reset rod is embedded in the circular hole.

[0021] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: the connecting boss is provided with a slot, a guide rod is provided in the slot, and one end of the guide rod located in the annular cavity K is provided with a chamfer to form an inclined surface;

[0022] The annular disk has a slot on its end face near the connecting boss that intersects with the circular hole.

[0023] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit according to the present invention, wherein: one end of the guide rod located outside the annular cavity K is connected to a limiting ring, the inner side of the limiting ring extends toward the axis to form a protrusion, a fourth spring is fixedly connected to the protrusion, and the other end of the fourth spring is fixedly connected to a connecting boss.

[0024] As a preferred embodiment of the water supply device for preventing the economizer of a million-kilowatt double reheat unit as described in this invention, after one end of the guide rod is inserted into the slot, the chamfer pushes the reset rod to move toward the axis of the water inlet pipe.

[0025] The beneficial effects of this invention are as follows: When the economizer is not completely filled with water and local vaporization occurs in the outlet header after heat exchange, the pressure generated by vaporization pushes the annular disk, which moves along the axial direction, thereby driving the moving ring and rotating ring to deflect the ball. No manual monitoring is required. Once the vaporization pressure inside the outlet header increases, the channel can be automatically opened to supply water. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 A schematic diagram of a water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit, as provided in an embodiment of the present invention.

[0028] Figure 2 A schematic diagram of the water inlet assembly in a water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit, as provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the explosion structure of the water inlet assembly in a water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit, provided as an embodiment of the present invention.

[0030] Figure 4 A schematic diagram of the structure of the water supply component in the water supply device for preventing vaporization of the economizer of a million-kilowatt double reheat unit according to an embodiment of the present invention, showing the water supply during vaporization.

[0031] Figure 5 This is a schematic diagram of the water supply component completing water supply in a water supply device for preventing vaporization of the economizer in a megawatt reheat unit, as provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0036] Example 1

[0037] Reference Figure 1 This embodiment provides a water supply device to prevent vaporization of the economizer in a megawatt reheat unit. It includes an economizer outlet header 100 connected to the economizer. The outlet header 100 is provided with an inlet 101 and an outlet 102. The inlet 101 is provided with a pipe 103 extending into the outlet header 100. One end of the pipe 103 located outside the outlet header 100 is provided with a connecting boss 103a. The connecting boss 103a is annular.

[0038] It also includes a water inlet assembly 200, which includes a water inlet pipe 201. The water inlet pipe 201 is connected to the connecting boss 103a and the connection is sealed. An annular cavity K is formed between the water inlet pipe 201 and the pipe 103.

[0039] The inlet pipe 201 is provided with a through channel 201a, a spherical groove 201b is provided in the channel 201a, a ball 202 is provided in the spherical groove 201b, and a through hole 202a is provided in the ball 202, thus forming a valve body. When water is needed, the ball 202 is operated to make its through hole coaxial with the channel 201a.

[0040] Furthermore, one end of the water inlet pipe 201 is connected to the water inlet 101, and the other end is connected to the water supply pipe 300 to supply water to the economizer outlet header 100.

[0041] When vaporization occurs inside the outlet header 100, water can be injected into it through the water inlet assembly 200.

[0042] Example 2

[0043] Reference Figures 1-5 This is the second embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0044] An annular disk 104 is provided inside the annular cavity K. The outer side of the annular disk 104 is slidably connected to the inner side of the pipe 103, and the inner side of the annular disk 104 is slidably connected to the outer side of the inlet pipe 201. Therefore, the annular disk 104 can slide axially inside the annular cavity K. The opening of the annular cavity K faces the inside of the outlet header 100. It should be noted that the connecting boss 103a is provided with a vent hole. When vaporization occurs inside the outlet header 100, the internal pressure increases. Under the action of the pressure, the annular disk 104 is pushed to move axially.

[0045] Among them, a cylindrical groove 201c is provided on the side of the spherical groove 201b. The cylindrical groove 201c is arranged radially along the channel 201a. A rotating shaft 202b is provided outside the sphere 202. The rotating shaft 202b is rotatably connected to the cylindrical groove 201c. The axis of the rotating shaft 202b is perpendicular to the axis of the through hole 202a.

[0046] Furthermore, a first annular groove 201d is provided inside the water inlet pipe 201, which intersects with the cylindrical groove 201c. A rotating ring 203 is provided inside the first annular groove 201d, and the rotating ring 203 can rotate within the first annular groove 201d. An end face gear 203a is provided on the end face of the rotating ring 203, and a spur gear 202c is provided at one end of the rotating shaft 202b. The end face gear 203a meshes with the spur gear 202c. Therefore, the deflection of the ball 202 is controlled by the rotating ring 203.

[0047] The inlet pipe 201 is also provided with a second annular groove 201e, which intersects with the first annular groove 201d. A movable ring 204 is provided in the second annular groove 201e, which is sleeved on the outside of the rotating ring 203. The movable ring 204 can move axially within the second annular groove 201e.

[0048] A spiral groove 203b is provided on the outside of the rotating ring 203, and a boss 204a is provided on the inside of the moving ring 204, with the boss 204a embedded in the spiral groove 203b. Therefore, when the moving ring 204 is moved axially within the second annular groove 201e, the boss 204a drives the rotating ring 203 to rotate. It should be noted that when the boss 204a moves from one end of the spiral groove 203b to the other end, the change in rotation of the rotating ring 203 causes the sphere 202 to deflect by 90°. In the initial state, the axis of the through hole 202a is perpendicular to the axis of the channel 201a, meaning the water inlet assembly 200 channel is closed. After deflection by 90°, the axis of the through hole 202a is collinear with the axis of the channel 201a, meaning the water inlet assembly 200 channel is open and water can be supplied.

[0049] Preferably, a first spring 205 is provided between the movable ring 204 and the end face of the second annular groove 201e near the rotating shaft 202b. The first spring 205 is a compression spring, that is, under the action of the first spring 205, in the initial state, the movable ring 204 is located away from the ball 202, and the boss 204a is located at the starting end of the spiral groove 203b.

[0050] Furthermore, a strip groove 201f is provided on the outside of the water inlet pipe 201, and the strip groove 201f is connected to the second annular groove 201e; a frustum 204b is provided on the outer periphery of the moving ring 204, and the frustum 204b is embedded in the strip groove 201f, which can restrict the circumferential deflection of the spiral groove 203b, so that it can only move along the axial direction.

[0051] Furthermore, a radially extending spring groove 201g is provided on the inner side of the second annular groove 201e. A limiting pin 206 is provided inside the spring groove 201g, and a second spring 207 is provided between the limiting pin 206 and the bottom of the spring groove 201g. The frustum 204b is provided with a limiting hole 204c that penetrates radially along the moving ring 204. The position of the spring groove 201g should satisfy the following condition: when the boss 204a drives the starting end of the spiral groove 203b to move to the end, that is, when the water inlet assembly 200 channel changes from closed to open, the limiting hole 204c is coaxial with the spring groove 201g, and under the action of the second spring 207, the limiting pin 206 pops out and embeds into the limiting hole 204c to restrict the movement of the moving ring 204, so that the water inlet assembly 200 is in the water supply state.

[0052] Preferably, a reset rod 208 is provided inside the limiting hole 204c; a limiting groove 204d is formed inside the limiting hole 204c, the inner diameter of the limiting groove 204d is larger than the diameter of the limiting hole 204c, and a limiting platform 208a is provided on the portion of the reset rod 208 located inside the limiting groove 204d. A third spring 209 is provided between the limiting platform 208a and the end face of the limiting groove 204d near the center of the moving ring 204. Therefore, when the reset rod 208 moves against the elastic force of the third spring 209, the end of the reset rod 208 can push the limiting pin 206 out of the limiting hole 204c. At this time, under the action of the first spring 205, the moving ring 204 is reset, and the water inlet assembly 200 is closed.

[0053] The annular disk 104 has a radially arranged circular hole 104a on its inner side, and one end of the reset rod 208 is embedded in the circular hole 104a. Therefore, when vaporization occurs inside the outlet header 100, the internal pressure pushes the annular disk 104, which in turn drives the reset rod 208, thereby driving the moving ring 204 and the rotating ring 203 to deflect the ball. In this embodiment, no manual monitoring is required. Once the vaporization pressure inside the outlet header 100 increases, the channel can be automatically opened to supply water. When the annular disk 104 is pushed to the bottom, the limiting hole 204c is coaxial with the spring groove 201g. Under the action of the second spring 207, the limiting pin 206 pops out and embeds in the limiting hole 204c to restrict the movement of the moving ring 204, thus ensuring that the water inlet assembly 200 is in a water supply state.

[0054] It should be noted that an annular cylinder with a sealing function can be installed inside the annular disc 104 and fitted over the water inlet pipe 201.

[0055] Furthermore, the connecting boss 103a is provided with a slot 103b, and a guide rod 105 is provided in the slot 103b. One end of the guide rod 105 located in the annular cavity K is provided with a chamfer 105a to form a bevel. The end face of the annular disk 104 near the connecting boss 103a is provided with a slot 104b that intersects with the circular hole 104a. The slot 103b and the slot 104b are positioned correspondingly. That is, when the annular disk 104 is pushed by vaporization pressure, the end of the guide rod 105 with the chamfer 105a can be inserted into the slot 104b. When the water supply can be stopped, the guide rod 105 is manually operated so that the bevel formed by the chamfer 105a presses the reset rod 208, which in turn pushes the limit pin 206 out of the limit hole 204c. At this time, under the action of the first spring 205, the moving ring 204 is reset, and the water inlet assembly 200 is closed.

[0056] Preferably, one end of the guide rod 105 located outside the annular cavity K is connected to a limiting ring 105b. The inner side of the limiting ring 105b extends towards the axis to form a protrusion, which is fixedly connected to a fourth spring 106. The other end of the fourth spring 106 is fixedly connected to a connecting boss 103a. That is, under the action of the fourth spring 106, one end of the chamfer 105a does not exert pressure on the reset rod 208 and requires manual pressure.

[0057] Therefore, after one end of the guide rod 105 is inserted into the slot 104b, the chamfer 105a pushes the reset rod 208 to move towards the axis of the water inlet pipe 201.

[0058] In this embodiment, when the economizer is not completely filled with water (even if the water storage tank is full when the boiler is filled with water, the air vent valve at the economizer outlet will not release water), local vaporization occurs in the outlet header 100 after heat exchange. This local vaporization gradually develops into "vapor resistance," eventually expanding the vaporization range. At this time, the pressure generated by vaporization pushes the annular disk 104, which moves axially, thereby driving the moving ring 204 and the rotating ring 203 to deflect the ball. That is, in this embodiment, no manual monitoring is required. Once the vaporization pressure inside the outlet header 100 increases, the channel can be automatically opened to supply water. When the annular disc 104 is pushed to the bottom, the limiting hole 204c is coaxial with the spring groove 201g. Under the action of the second spring 207, the limiting pin 206 pops out and is embedded in the limiting hole 204c to restrict the movement of the moving ring 204, so that the water inlet assembly 200 is in the water supply state. When the water supply can be stopped, the guide rod 105 is manually operated so that the inclined surface formed by its chamfer 105a presses the reset rod 208, which can push the limiting pin 206 out of the limiting hole 204c. At this time, under the action of the first spring 205, the moving ring 204 is reset and the water inlet assembly 200 is closed.

[0059] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0060] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0061] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit, characterized in that: include, An economizer outlet header (100) is connected to the economizer. The outlet header (100) is provided with an inlet (101) and an outlet (102). The inlet (101) is provided with a pipe (103) extending into the outlet header (100). The pipe (103) is provided with a connecting boss (103a) at one end outside the outlet header (100). The water inlet assembly (200) includes a water inlet pipe (201), which is connected to a connecting boss (103a), and an annular cavity (K) is formed between the water inlet pipe (201) and the pipe (103). The water inlet pipe (201) is provided with a through channel (201a), a spherical groove (201b) is provided in the channel (201a), a sphere (202) is provided in the spherical groove (201b), and a through hole (202a) is provided in the sphere (202). One end of the water inlet pipe (201) is connected to the water inlet (101), and the other end is connected to the water supply pipe (300). An annular disk (104) is provided inside the annular cavity (K). The outer side of the annular disk (104) is slidably connected to the inner side of the pipe (103), and the inner side of the annular disk (104) is slidably connected to the outer side of the water inlet pipe (201). The spherical groove (201b) has a cylindrical groove (201c) on its side. A rotating shaft (202b) is provided outside the sphere (202). The rotating shaft (202b) is rotatably connected to the cylindrical groove (201c). The axis of the rotating shaft (202b) is perpendicular to the axis of the through hole (202a). The water inlet pipe (201) is provided with a first annular groove (201d), which intersects with the cylindrical groove (201c). A rotating ring (203) is provided in the first annular groove (201d), and an end face gear (203a) is provided on the end face of the rotating ring (203). A spur gear (202c) is provided at one end of the rotating shaft (202b), and the end face gear (203a) meshes with the spur gear (202c). The water inlet pipe (201) is also provided with a second annular groove (201e), which intersects with the first annular groove (201d). A movable ring (204) is provided in the second annular groove (201e), which is sleeved outside the rotating ring (203). The rotating ring (203) has a spiral groove (203b) on its outside, and the moving ring (204) has a boss (204a) on its inside side, and the boss (204a) is embedded in the spiral groove (203b). A first spring (205) is provided between the movable ring (204) and the end face of the second annular groove (201e) near the rotating shaft (202b).

2. The water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit according to claim 1, characterized in that: The water inlet pipe (201) is provided with a strip groove (201f) on the outside, and the strip groove (201f) is connected to the second annular groove (201e); A frustum (204b) is provided on the outer periphery of the moving ring (204), and the frustum (204b) is embedded in the strip groove (201f); a radial spring groove (201g) is provided on the inner side of the second annular groove (201e), a limiting pin (206) is provided in the spring groove (201g), a second spring (207) is provided between the limiting pin (206) and the bottom of the spring groove (201g), and a limiting hole (204c) is provided on the frustum (204b) that penetrates radially along the moving ring (204).

3. The water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit according to claim 2, characterized in that: A reset rod (208) is provided inside the limiting hole (204c); The limiting hole (204c) forms a limiting groove (204d) inside. The portion of the reset rod (208) located in the limiting groove (204d) is provided with a limiting platform (208a). A third spring (209) is provided between the limiting platform (208a) and the end face of the limiting groove (204d) near the center of the moving ring (204).

4. The water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit according to claim 3, characterized in that: The inner side of the annular disk (104) is provided with a radial circular hole (104a), and one end of the reset rod (208) is embedded in the circular hole (104a).

5. The water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit according to claim 4, characterized in that: The connecting boss (103a) is provided with a slot (103b), and a guide rod (105) is provided in the slot (103b). One end of the guide rod (105) located in the annular cavity (K) is provided with a chamfer (105a) to form an inclined surface. The annular disk (104) has a slot (104b) on its end face near the connecting boss (103a) that intersects with the circular hole (104a).

6. The water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit according to claim 5, characterized in that: The guide rod (105) is connected to a limiting ring (105b) at one end outside the annular cavity (K). The inner side of the limiting ring (105b) extends toward the axis to form a protrusion. A fourth spring (106) is fixedly connected to the protrusion. The other end of the fourth spring (106) is fixedly connected to the connecting boss (103a).

7. The water supply device for preventing vaporization of the economizer in a million-kilowatt double reheat unit according to claim 6, characterized in that: After one end of the guide rod (105) is inserted into the slot (104b), the chamfer (105a) pushes the reset rod (208) to move toward the axis of the water inlet pipe (201).

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