A disc-shaped two-phase flow nozzle device

Abstract

The application belongs to the technical field of atomizing nozzles, and particularly relates to a disc-shaped two-phase flow nozzle device. The existing multi-layer disc-shaped spray ports are generally in the same vertical direction, which causes a large number of intersections of broken small droplets in the falling process, seriously affects the heat exchange effect of the droplets and water vapor, and reduces the oxygen removal efficiency of the oxygen remover. The disc-shaped two-phase flow nozzle device provided by the application comprises a nozzle body, wherein the nozzle body is connected with a ring-shaped disc assembly, the nozzle body comprises a gas pipe and a nozzle which are connected with each other from inside to outside, the ring-shaped disc assembly comprises a plurality of ring-shaped discs, a disc cavity is arranged in each ring-shaped disc, a plurality of gas holes are arranged on the gas pipe, a plurality of liquid holes are arranged on the nozzle, the gas holes and the liquid holes are mutually penetrated, and the liquid holes and the disc cavities are mutually penetrated. The oxygen removal efficiency of the oxygen remover is improved.

Description

Technical Field

[0001] This application belongs to the field of atomizing nozzle technology, and in particular relates to a disc-shaped two-phase flow nozzle device. Background Technology

[0002] With the rapid development of science and technology in my country and the requirements of the overall development goal of building an intensive society, improving the efficiency of coal-fired power generation units and building nuclear power units with independent intellectual property rights have become two major directions for the development of the power industry. Among coal-fired power units, large-capacity, high-parameter supercritical and ultra-supercritical coal-fired units with a capacity of 600-1000MW have occupied most of the domestic power generation equipment market.

[0003] As an important auxiliary device in the regenerative cycle system of large and medium-sized thermal power generating units, the headless deaerator's main function is to remove oxygen and non-condensable gases from the boiler feedwater. Condensate is injected into the deaerator's steam space through constant-speed nozzles for initial deoxygenation, then falls into the water space and flows to the outlet. Heating steam pipes are evenly distributed along the deaerator's axial direction. Heating steam is sent into the deaerator from underwater through these pipes, mixing and heating with the water while simultaneously agitating the water flow and carrying dissolved oxygen and other non-condensable gases to the surface, achieving deep deoxygenation of the condensate. The longer the water flows through the deaerator, the better the deep deoxygenation effect. Steam is sent in from underwater; the uncondensed heating steam (at this point, saturated steam) carries non-condensable gases to the water surface and flows towards the exhaust area of ​​the nozzles (the exhaust area around the nozzles is an unsaturated water spray zone). In the exhaust area, the uncondensed heating steam condenses into water, while the non-condensable gases are discharged from the exhaust port.

[0004] However, due to the size limitations of the deaerator, simply increasing the water flow rate within it is not feasible. Therefore, improving the initial deaeration efficiency is highly effective in enhancing the overall deaeration efficiency. As a core component of the deaerator, the nozzle's performance directly impacts the equipment's performance indicators. In disc nozzles, condensate from the outside passes through a filter and enters the gaps between multiple discs. Under pressure differential, the condensate is sprayed outwards along the radial direction of the parallel discs, forming multiple water films that are injected into the deaerator cavity through the gaps in the discs. The breakage of the liquid film forms numerous tiny droplets that exchange heat with the surrounding hot steam. However, the nozzles of existing multi-layer discs are typically positioned in the same vertical direction, causing a large number of small droplets to converge during their descent, severely affecting the heat exchange between the droplets and the steam, and reducing the deaerator's deaeration efficiency. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] The problem that the nozzles of existing multi-layer discs are usually located in the same vertical direction can cause a large number of small droplets to converge during their fall, which seriously affects the heat exchange effect between the droplets and water vapor and reduces the deoxygenation efficiency of the deaerator. This application provides a disc-shaped two-phase flow nozzle device.

[0007] 2 Technical Solution

[0008] To achieve the above objectives, this application provides a disc-shaped two-phase flow nozzle device, including a nozzle body connected to an annular disc assembly. The nozzle body includes an air pipe and a nozzle connected from the inside to the outside. The annular disc assembly includes a plurality of annular discs, each annular disc having a disc cavity. The air pipe has a plurality of air holes, and the nozzle has a plurality of liquid holes. The air holes and the liquid holes communicate with each other, and the liquid holes communicate with the disc cavity.

[0009] Another embodiment provided in this application is: the air pipe is fixed inside the nozzle, the air pipe is used to introduce water vapor, and a liquid cavity is formed between the air pipe and the nozzle.

[0010] Another embodiment provided in this application is that the liquid holes are distributed in a circumferential array.

[0011] Another embodiment provided in this application is that the vent connects the air tube and the liquid cavity.

[0012] Another embodiment provided in this application is: a plurality of the annular discs are arranged at equal intervals, and the diameters of the plurality of annular discs decrease by an equal amount from top to bottom.

[0013] Another embodiment provided in this application is: the disc cavity divides the annular disc into two symmetrical parts, and the outer edge of the annular disc is elastic.

[0014] Another embodiment provided in this application is that the number of air holes and liquid holes is the same, and the liquid holes and air holes are on the same horizontal plane and at the same angle.

[0015] Another embodiment provided in this application is: the number of air holes and liquid holes is the same, the liquid holes and air holes are not on the same horizontal plane, and the air holes and liquid holes are staggered.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the dish-shaped two-phase flow nozzle device provided in this application are as follows:

[0018] The disc-shaped two-phase flow nozzle device provided in this application is a high-efficiency atomizing disc nozzle. It not only preheats the condensate inside the disc nozzle, so that the condensate is heated before entering the deaerator for further heating, making the subsequent heating process smoother, but also allows the condensate to combine with water vapor to form a gas-liquid mixture. When the fluid is sprayed outward through the disc cavity, the atomization effect is better, and the contact and heating with the subsequent internal water vapor is more complete, improving the atomization effect of the disc nozzle and increasing the deaerator's deoxygenation efficiency.

[0019] The disc-shaped two-phase flow nozzle device provided in this application preheats the condensate inside the disc nozzle by introducing a high-temperature, high-pressure steam gas path into the gas pipe of the disc nozzle. This ensures that the condensate is preheated before entering the deaerator for further heating, making the subsequent heating process smoother. It also allows the condensate and steam to combine to form a gas-liquid mixture. When the fluid is atomized and sprayed outward through the disc cavity, the atomization effect is improved, resulting in more thorough contact and heating with the subsequent internal steam. This enhances the atomization effect of the disc nozzle and improves the deaerator's deoxygenation efficiency.

[0020] The disc-shaped two-phase flow nozzle device provided in this application sets the diameter of the annular discs to decrease equally from top to bottom, and distributes them evenly in space. This ensures that the small droplets ejected from the injection holes of different discs have their own falling space and no longer overlap in space. This reduces the overlap of atomized droplets ejected from the multi-layer annular discs during the falling process and increases the heat exchange area between the droplets and the rising water vapor in the deaerator.

[0021] The disc-shaped two-phase flow nozzle device provided in this application allows the upper and lower parts of the annular disc to automatically adjust the disc gap width according to the size of the incoming flow within a certain flow range, thus maintaining a constant injection pressure drop. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the disc-shaped two-phase flow nozzle device of this application;

[0023] Figure 2 This is a front perspective sectional view of the disc-shaped two-phase flow nozzle device of this application;

[0024] Figure 3 This is a partial cross-sectional view of the front of the disc-shaped two-phase flow nozzle device of this application;

[0025] Figure 4 This is a second front perspective sectional view of the disc-shaped two-phase flow nozzle device of this application;

[0026] Figure 5 This is a second front partial sectional view of the disc-shaped two-phase flow nozzle device of this application. Detailed Implementation

[0027] In the following, specific embodiments of this application will be described in detail with reference to the accompanying drawings. Based on these detailed descriptions, those skilled in the art will be able to clearly understand and implement this application. Without departing from the principles of this application, features from various embodiments can be combined to obtain new implementations, or certain features from some embodiments can be substituted to obtain other preferred implementations.

[0028] See Figures 1-5 This application provides a disc-shaped two-phase flow nozzle device, including a nozzle body 1, which is connected to an annular disc assembly. The nozzle body 1 includes an air pipe 2 and a nozzle connected from the inside to the outside. The annular disc assembly includes a plurality of annular discs 5, and a disc cavity 6 is provided inside the annular discs 5. A plurality of air holes 8 are provided on the air pipe 2, and a plurality of liquid holes 7 are provided on the nozzle. The air holes 8 and the liquid holes 7 communicate with each other, and the liquid holes 7 communicate with the disc cavity 6.

[0029] A steam chamber 3 is formed inside the duct 2 for introducing water vapor. This solves the problem that existing disc nozzles cause a large number of broken droplets to converge during their fall, which seriously affects the heat exchange effect between the droplets and water vapor. This achieves the goal of increasing the heat exchange area between the droplets and water vapor, thereby improving the deaerator's deoxygenation efficiency.

[0030] Furthermore, the air pipe 2 is fixed inside the nozzle, the air pipe 2 is used to introduce water vapor, and a liquid cavity 4 is formed between the air pipe 2 and the nozzle.

[0031] Furthermore, the liquid holes 7 are distributed in a circumferential array.

[0032] Furthermore, the vent 8 connects the air tube 2 and the liquid chamber 4.

[0033] Furthermore, the annular discs 5 are arranged at equal intervals, and the diameters of the annular discs 5 decrease by an equal amount from top to bottom.

[0034] Furthermore, the disc cavity 6 divides the annular disc 5 into two symmetrical parts, and the outer edge of the annular disc 5 is elastic.

[0035] Furthermore, the number of air holes 8 and liquid holes 7 are the same, and the liquid holes 7 and air holes 8 are on the same horizontal plane and at the same angle.

[0036] Furthermore, the number of air holes 8 and liquid holes 7 is the same, the liquid holes 7 and air holes 8 are not on the same horizontal plane, and the air holes 8 and liquid holes 7 are staggered.

[0037] Example

[0038] Example 1

[0039] Figures 1-3 An embodiment of this application is provided: a high-efficiency atomizing disc nozzle structure, including a disc nozzle, an air pipe 2 fixedly disposed on the inner side of the disc nozzle, a steam chamber 3 for introducing water vapor disposed on the inner side of the air pipe 2, and a liquid chamber 4 disposed between the disc nozzle and the air pipe 2.

[0040] Several equally spaced annular discs 5 are fixedly installed on the outer bottom of the disc nozzle. A disc cavity 6 is opened on the inner side of the annular discs 5. The diameter of the annular discs 5 decreases equally from top to bottom. The broken droplets sprayed from the annular discs 5 at different levels reduce the intersection in the falling space, increase the heat exchange area when in contact with the water vapor inside the deaerator, increase the contact area between the atomized condensate and the water vapor inside the deaerator, and improve the heat exchange efficiency. The disc cavity 6 divides the annular discs 5 into two symmetrical parts, and the outer edge of the annular discs 5 is elastic. The thin liquid film formed by the annular discs 5 is conducive to atomization. The upper and lower parts of the annular discs 5 can act as springs, automatically adjusting the disc gap width according to the flow rate. Within a certain range, the injection pressure drop remains constant, and it has strong operational stability.

[0041] Steam is introduced into the gas pipe 2 and enters the liquid chamber 4. The condensate inside the disc nozzle is heated by the steam ejected from the steam chamber 3, creating a pressure difference between the annular disc 5 and the disc nozzle. The gas-liquid mixture is ejected from the inside out along the radial direction parallel to the annular disc 5 and injected into the deaerator chamber through the gaps on the annular disc 5. The gas expands in the liquid to form bubbles and eventually breaks down, forming a large number of tiny droplets that further exchange heat with the surrounding hot steam.

[0042] Inside the disc cavity 6, there are several liquid holes 7 on the disc-shaped nozzle. The number of liquid holes 7 is set to be several and distributed in a circular array. The liquid holes 7 are used to connect the liquid cavity 4 and the disc cavity 6. At the bottom of the air pipe 2, there are several air holes 8 distributed in a circular array. The air holes 8 are used to connect the steam cavity 3 and the liquid cavity 4. The number of air holes 8 and liquid holes 7 is the same. The liquid holes 7 and air holes 8 are on the same horizontal plane and have the same angle. The high-temperature water vapor input is discharged into the liquid cavity 4 through the air holes 8. The water vapor and condensate in the liquid cavity 4 are ejected from the liquid holes 7 and enter the interior of the disc cavity 6. The water jet is unstable and broken.

[0043] The disc cavities 6 between each layer of annular discs 5 form a spray nozzle. Liquid holes 7 are evenly arranged along the cylinder wall between the upper and lower parts of the annular discs 5. Water is sprayed into the disc cavity 6 from the liquid holes 7. It first undergoes jet stabilization and breakage, and then is rectified in the disc cavity 6 before being sprayed out from the inside out along the gaps of the annular discs 5. The small droplets that have undergone two breakages enter the deaerator and exchange heat with the internal water vapor.

[0044] In this embodiment, when the disc nozzle is working, high-pressure, high-temperature water vapor is delivered to the steam chamber 3 inside the gas pipe 2, and is injected into the liquid chamber 4 through the air hole 8. It combines with the condensate in the liquid chamber 4 to exchange heat. After the water vapor is ejected from the air hole 8 and combines with the condensate in the liquid chamber 4, it is directly sprayed into the disc cavity 6 along the liquid hole 7. It is rectified in the disc cavity 6 and sprayed out from the inside to the outside along the gap between the two parts of the annular disc 5 into the deaerator.

[0045] Example 2

[0046] refer to Figures 4-5 Similar to Embodiment 1, but with an optimization: a liquid hole 7 is provided on the disc-shaped nozzle inside the disc cavity 6, and the number of liquid holes 7 is set to several and distributed in a circumferential array. The liquid holes 7 are used to connect the liquid cavity 4 and the disc cavity 6. A number of air holes 8 are provided at the bottom of the air pipe 2 and distributed in a circumferential array. The air holes 8 are used to connect the air cavity 3 and the liquid cavity 4. The liquid holes 7 and air holes 8 in each layer are not on the same horizontal plane, and the liquid holes 7 and air holes 8 in each layer are designed to intersect each other.

[0047] In this embodiment, when the disc nozzle is working, high-pressure, high-temperature water vapor is delivered to the steam chamber 3 inside the gas pipe 2, and then injected into the liquid chamber 4 through the air hole 8. It combines with the condensate in the liquid chamber 4 to exchange heat. After the water vapor is ejected from the air hole 8 and combines with the condensate in the liquid chamber 4, it will be rectified in the liquid chamber 4 and then injected into the disc cavity 6 through the liquid hole 7. Then it is ejected along the gap between the annular discs 5 and enters the deaerator.

[0048] Although this application has been described above with reference to specific embodiments, those skilled in the art will understand that many modifications can be made to the configurations and details disclosed in this application within the principles and scope of the disclosure. The scope of protection of this application is determined by the appended claims, and the claims are intended to cover all modifications included in the literal meaning or scope of equivalents of the technical features in the claims.

Claims

1. A disc-shaped two-phase flow nozzle device, characterized in that: The device includes a nozzle body connected to an annular disc assembly. The nozzle body includes an air tube and a nozzle connected from the inside to the outside. The annular disc assembly includes a plurality of annular discs, and a disc cavity is provided inside the annular discs. A plurality of air holes are provided on the air tube, and a plurality of liquid holes are provided on the nozzle. The air holes and the liquid holes are interconnected, and the liquid holes are interconnected with the disc cavity. The air tube is fixed inside the nozzle and is used to introduce water vapor. A liquid cavity is formed between the air tube and the nozzle. The annular discs are arranged at equal intervals, and the diameters of the annular discs decrease equally from top to bottom.

2. The dish-shaped two-phase flow nozzle device as described in claim 1, characterized in that: The liquid pores are distributed in a circumferential array.

3. The dish-shaped two-phase flow nozzle device as described in claim 1, characterized in that: The vent connects the air tube and the liquid cavity.

4. The dish-shaped two-phase flow nozzle device as described in claim 1, characterized in that: The disc cavity divides the annular disc into two symmetrical parts, and the outer edge of the annular disc is elastic.

5. The disc-shaped two-phase flow nozzle device as described in claim 4, characterized in that: The number of air holes and liquid holes is the same, and the liquid holes and air holes are on the same horizontal plane and at the same angle.

6. The dish-shaped two-phase flow nozzle device as described in claim 5, characterized in that: The number of air holes and liquid holes is the same, the liquid holes and air holes are not on the same horizontal plane, and the air holes and liquid holes are arranged alternately.

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