Venturi type desuperheater
Through the combined structure of the Venturi tube body and wing nozzle, the existing temperature reducer has poor atomization effect and short life under unstable steam pressure, and efficient atomization and steam mixing are achieved, extending service life and reducing maintenance needs.
Patent Information
- Application Number
- CN202421685046.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the case of unstable steam pressure and pressure difference, the cooling water flow rate is insufficient, and the atomization effect is poor, which is prone to two-phase flow of water and gas, resulting in vibration and pipe damage, and has a short service life.
The combined structure of the venturi pipe body and the wing nozzle is adopted. Through the wing nozzle design and the venturi effect, efficient atomization of cooling water and full mixing of steam are achieved, reducing the impact of steam flow rate changes on the pipeline.
Complete atomization of cooling water under small steam pressure and pressure difference is achieved, preventing thermal shock, extending the service life of the temperature reducer, reducing maintenance needs, and improving service efficiency and life.
Smart Images
Figure CN223063836U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a Venturi type desuperheater, in particular to a Venturi type desuperheater. Background Art
[0002] At present, most desuperheaters in various fields adopt an insert-type nozzle structure, which includes a spray nozzle assembly, a thermal sleeve and a shell sleeve connected by a flange. The coolant of the desuperheater is sprayed into the steam flow through one or more atomizing nozzles; the atomizing nozzles are located on the central axis of the desuperheater, and the coolant is sprayed into the steam in the same direction as the steam, having the following defects:
[0003] 1. Since the inner diameter of the pipeline is fixed and the steam flow rate is a fixed quantity, but in on-site use, the pressure and pressure difference of the steam pipeline cannot be stable and unchanged, and of course the medium flow rate is also unequal. Therefore, it is required that the cooling water flow width of the desuperheater is relatively large. Especially when the steam pressure and pressure difference are small and a relatively small steam flow rate is required, if the desuperheating water cannot reduce the cooling water with the minimum flow rate, the atomization effect is poor.
[0004] 2. During low-load operation, the flow rate cannot be effectively increased, the cooling water cannot be fully mixed with the steam, the atomization effect is poor, and a water-vapor two-phase flow is likely to occur. The desuperheater will vibrate and whistle, and in severe cases, the pipeline will be damaged and cause external leakage.
[0005] 3. The designed pipeline requires a sufficient length of thermal sleeve and pipe shell, and sufficient space is required for installation. The pipeline is generally formed by reel welding, which is prone to sand holes and cracks. For the insert-type nozzle, in the case of a water-vapor two-phase flow, it is prone to erosion, and if there are garbage impurities in the system, it may cause blockage.
[0006] 4. The steam and water cannot fit well. In the case of a water-vapor two-phase flow, it is easy to cause erosion of the inner wall of the steam pipeline, and the downstream pipeline will be subjected to thermal shock, resulting in a short service life.
[0007] Therefore, we propose a Venturi type desuperheater. Content of the Utility Model
[0008] The technical problem to be solved by the utility model is to provide a Venturi type desuperheater, which solves the defects described in the background art of the existing desuperheater.
[0009] To solve the above technical problems, the present utility model provides the following technical solutions: A Venturi type desuperheater, comprising a Venturi tube body, a wing-shaped nozzle, a locking nut, a diversion pipe, a connecting flange and a desuperheating water pipe. The wing-shaped nozzle is installed on the inner wall of the Venturi tube body. The bottom end of the wing-shaped nozzle is connected with the locking nut by a thread. The diversion pipe is installed below the locking nut. The connecting flange is installed below the diversion pipe. The connecting flange is fixedly connected to the Venturi tube body by bolts. The bottom end of the connecting flange is fixedly connected with the desuperheating water pipe.
[0010] On the basis of the above solution, the diversion pipe is in sliding fit with the Venturi tube body, and the connecting flange is pressed against the diversion pipe.
[0011] On the basis of the above solution, the connecting flange and the desuperheating water pipe are fixedly connected by welding.
[0012] The beneficial effects of the present utility model compared with the prior art are as follows: A Venturi type desuperheater has the following advantages:
[0013] 1. The steam side turndown ratio (maximum flow / minimum flow) that a Venturi desuperheater can handle depends on the allowable steam side pressure drop on the desuperheater. Since most high pressures are available, a thin water film is formed on the surface of the special nozzle. The dynamic energy of the steam flow breaks the surface tension of the film, forming a conical water spray. Ideally, the added cooling water should be completely atomized to ensure temperature stability and prevent thermal shock in the downstream pipeline. The ideal mixing of superheated steam and water is achieved through high steam flow turbulence. This is caused by the special shape of the nozzle and the Venturi effect of the present invention: the phenomenon that the velocity of the fluid increases and the pressure decreases under the Venturi pipe structure.
[0014] 2. For the Venturi desuperheater, under the conditions of relatively small steam pressure and pressure difference, through the specially designed Venturi curve, an effective flow velocity can be satisfied, generating dynamic energy inside the desuperheater. The cooling water is sucked in and atomized into fine cooling water droplets through the special wing-shaped nozzle design. The combination of the Venturi tube and the wing-shaped nozzle will generate high turbulence (eddy current) and ensure rapid and complete evaporation in a very short time.
[0015] 3. The installation of the Venturi desuperheater upstream and downstream only requires a relatively short straight steam pipe length, and does not require a thermal sleeve and a pressure reducing system, so a higher regulation ratio can be achieved.
[0016] 4. The Venturi desuperheater of the present invention is made by free integral forging, and the whole device is completed through mechanical processing technology, eliminating welded or assembled parts. Therefore, it is insensitive to thermal shock working conditions and hardly requires maintenance. The continuous service life exceeds 30 years, and it is a desuperheater solution with the lowest ownership cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic structural diagram of a Venturi type desuperheater of the present utility model;
[0018] Figure 2 is Figure 1 a partially enlarged view in
[0019] The reference numerals in the figure are: 1 - Venturi tube body, 2 - wing-shaped nozzle, 3 - lock nut, 4 - guide pipe, 5 - connecting flange, 6 - desuperheating water pipe. Specific embodiments
[0020] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0021] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0022] Referring to Figures 1 to 2 It can be seen that a Venturi type desuperheater includes a Venturi tube body 1, a wing-shaped nozzle 2, a lock nut 3, a guide pipe 4, a connecting flange 5 and a desuperheating water pipe 6. The wing-shaped nozzle 2 is installed on the inner wall of the Venturi tube body 1. The bottom end of the wing-shaped nozzle 2 is threadedly connected with a lock nut 3. A guide pipe 4 is installed below the lock nut 3. A connecting flange 5 is installed below the guide pipe 4. The connecting flange 5 is fixedly connected to the Venturi tube body 1 by bolts. The bottom end of the connecting flange 5 is fixedly connected with a desuperheating water pipe 6.
[0023] The guide pipe 4 is in sliding fit with the Venturi tube body 1, which is convenient for the disassembly and installation of the guide pipe 4. The connecting flange 5 presses on the guide pipe 4, and the connecting flange 5 can press and fix the guide pipe 4; the connecting flange 5 and the desuperheating water pipe 6 are fixedly connected by welding.
[0024] Principle and advantages of the present utility model: A Venturi type desuperheater adopts a new structure. Desuperheating water flows into the diversion pipe 4 from the desuperheating water pipe 6, and then flows out from the orifice of the wing-shaped nozzle 2 and mixes with the steam flowing out of the Venturi tube body 1. The wing-shaped nozzle 2 is fixed in the flow channel with the Venturi tube body 1 by a locking nut 3. Its nozzle opening is aligned with the outlet. The diversion pipe 4 is installed on the Venturi tube body 1 to protect the wall of the Venturi tube body 1 from being directly eroded by cooling water. The Venturi tube body 1 and the connecting flange 5 are fixed by bolts and nuts. A sealing gasket is used for fitting and sealing between the Venturi tube body 1 and the connecting flange 5 to prevent the leakage of cooling water. The desuperheating water pipe 6 is welded to the connecting flange 5 as a whole and connected to the desuperheating water system. According to the demand of steam flow, the steam temperature is adjusted by the flow rate through an external desuperheating water regulating valve. The present utility model has a simple structure, high use efficiency, wide use range, long service life and low manufacturing cost.
[0025] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A Venturi type desuperheater, comprising a Venturi tube body (1), a wing-shaped nozzle (2), a lock nut (3), a diversion pipe (4), a connecting flange (5) and a desuperheating water pipe (6), characterized in that: A wing-shaped nozzle (2) is installed on the inner wall of the Venturi tube body (1). The bottom end of the wing-shaped nozzle (2) is threadedly connected with a locking nut (3). A diversion pipe (4) is installed below the locking nut (3). A connecting flange (5) is installed below the diversion pipe (4). The connecting flange (5) is fixedly connected to the Venturi tube body (1) by bolts. A desuperheating water pipe (6) is fixedly connected to the bottom end of the connecting flange (5).
2. The Venturi type desuperheater according to claim 1, wherein The diversion pipe (4) is in sliding fit with the Venturi tube body (1), and the connecting flange (5) is pressed against the diversion pipe (4).
3. The Venturi type desuperheater according to claim 1, wherein, The connecting flange (5) and the desuperheating water pipe (6) are fixedly connected by welding.