Steam temperature and pressure reducing device with multiple safety protections

Abstract

The utility model discloses a steam temperature and pressure reducing device with multiple safety protection relates to the temperature and pressure reducing device field of high pressure steam. In the industrial field such as electric power, high temperature and high pressure steam need to be regulated and controlled parameters by temperature and pressure reducing device, and the existing device has the problems of uneven temperature reduction, insufficient overpressure protection, inconvenience of pollution discharge and easy leakage of pipeline. The utility model discloses a steam pipeline and temperature reducing water supply pipeline, is equipped with pilot type low noise sleeve adjusting valve, large flow atomizing nozzle device, two sets of duplex structure spring safety valve, pressure transmitter and integral type temperature transmitter on the steam pipeline, is equipped with temperature uniform distribution mechanism on the steam pipeline downstream of large flow atomizing nozzle device, and temperature reducing water supply pipeline is equipped with stop valve, filter, sleeve guide single seat adjusting valve and check valve, and is equipped with pollution discharge branch pipeline and spare bypass. Effectively realize double redundant grading overpressure protection, guarantee temperature and pressure reducing stability, be convenient for maintenance, improve system reliability and security.

Description

Technical Field

[0001] This utility model relates to the field of desuperheating and pressure reducing devices for high-pressure steam, and in particular to a steam desuperheating and pressure reducing device with multiple safety protections. Background Technology

[0002] In industries such as power, chemical, and petroleum, high-temperature and high-pressure steam serves as a crucial energy carrier. Its pressure and temperature parameters must strictly match the operational requirements of downstream equipment, necessitating the regulation of steam parameters to the target range using desuperheating and pressure-reducing devices. However, existing desuperheating and pressure-reducing devices still face several pressing problems under high-pressure, high-flow-rate steam conditions: uneven mixing of the desuperheating water sprayed from the atomizing nozzles with the high-temperature steam, coupled with a lack of effective temperature distribution mechanisms, easily leads to localized temperature gradients, affecting the stability of downstream processes; in terms of safety protection, many devices employ single or even individual safety valves, which, if malfunctions such as valve core jamming or spring failure occur, completely lose overpressure protection capabilities, potentially causing serious accidents such as pipeline rupture and equipment explosions due to steam system overpressure; simultaneously, desuperheating water pipelines are prone to retaining rust debris, scale, and other particulate matter, and existing devices lack efficient drainage designs, requiring frequent shutdowns for cleaning, resulting in high maintenance costs. Furthermore, the lack of overall optimization in pipeline layout makes them susceptible to leakage at interfaces due to thermal expansion and contraction, affecting system reliability. Therefore, there is an urgent need for a high-pressure, high-flow-rate steam desuperheating and pressure-reducing device that can achieve uniform desuperheating, multiple safety protections, and is easy to maintain. Utility Model Content

[0003] The technical problem to be solved and the technical task proposed by this utility model is to improve and refine the existing technical solutions, and to provide a steam desuperheating and pressure reducing device with multiple safety protections, so as to achieve multiple redundancies and step-by-step overpressure protection, and to avoid equipment damage or safety accidents caused by overpressure. To this end, this utility model adopts the following technical solution.

[0004] A steam desuperheating and depressurization device with multiple safety protections includes a steam pipeline and a desuperheating water supply pipeline. The steam pipeline includes an inlet pipeline for inputting high-temperature and high-pressure steam, a desuperheating and depressurization mixing pipeline for depressurizing and desuperheating the steam, and an outlet pipeline for outputting the treated steam, connected in sequence. The inlet end of the desuperheating and depressurization mixing pipeline is equipped with a pilot-operated low-noise sleeve regulating valve and a high-flow atomizing nozzle device in sequence according to the steam flow direction. The desuperheating water supply pipeline is connected to the high-flow atomizing nozzle device. The outlet end of the desuperheating and depressurization mixing pipeline is equipped with a first spring safety valve and a second spring safety valve in sequence according to the steam flow direction. Each set of spring safety valves adopts a vertically stacked double structure. By installing a pilot-operated low-noise sleeve regulating valve and a high-flow atomizing nozzle device at the inlet end of the pressure-reducing and cooling mixing pipeline, and adopting two sets of vertically stacked double-connected structures at the outlet end, a core architecture of "pressure reduction-cooling-dual redundancy overpressure protection" is formed. The double-connected spring safety valve realizes the safety backup in a single device, and the two sets set in sequence further enhance the redundancy of overpressure protection. It can simultaneously ensure the accuracy of parameter control and system safety under high pressure and high flow steam conditions, and avoid equipment damage or safety accidents caused by overpressure.

[0005] As a preferred technical approach, a pressure transmitter and an integrated temperature transmitter are installed on the outlet pipeline. These transmitters monitor the pressure and temperature parameters of the processed steam in real time, providing feedback to the control system. This facilitates timely adjustment of the opening of the pilot-operated low-noise sleeve regulating valve and the spray volume of the high-flow atomizing nozzle, ensuring that the steam parameters remain stable within the range required by the downstream process and improving the controllability of the system operation.

[0006] As a preferred technical approach, a temperature distribution mechanism is installed inside the pressure-reducing and temperature-reducing mixing pipeline downstream of the high-flow-rate atomizing nozzle device to make the temperature distribution more uniform. This mechanism can perform secondary mixing on the initially cooled steam, eliminate local temperature gradients caused by uneven atomization, make the outlet steam temperature distribution more uniform, avoid thermal stress damage to downstream equipment due to temperature fluctuations, and ensure process stability.

[0007] As a preferred technical means, the temperature uniform distribution mechanism employs several perforated plates, with the holes on each plate evenly distributed in a honeycomb pattern. This honeycomb perforated plate temperature uniform distribution mechanism can disperse the steam flow into multiple fine streams and force mixing. Through the step-by-step turbulence effect of the perforated structure, it efficiently eliminates temperature differences. The honeycomb-shaped distribution of holes further facilitates flow field homogenization, thereby improving the temperature uniformity effect.

[0008] As a preferred technical approach, the steam pipeline is constructed with a high-strength alloy steel outer shell. This shell can withstand the long-term scouring and high-temperature corrosion of high-pressure, high-flow steam, significantly improving the pipeline's pressure resistance and wear resistance, extending the overall service life of the device, and reducing safety risks caused by pipeline material failure.

[0009] As a preferred technical approach: the steam pipeline and the desuperheating water supply pipeline are connected to a skid-mounted base with a channel steel frame structure via multiple supports, wherein the pipeline of the second spring safety valve on the side adjacent to the outlet pipeline is mounted on a sliding support. The channel steel frame structure of the skid-mounted base facilitates the overall installation, transportation, and fixing of the device, improving on-site deployment efficiency; the sliding support used for the pipeline of the second spring safety valve near the outlet can accommodate the thermal expansion and contraction displacement of the steam pipeline due to temperature changes, avoiding stress cracking of the pipeline due to rigid constraints, and ensuring the sealing performance and structural stability of the pipeline connection.

[0010] As a preferred technical means: the desuperheating water supply pipeline is equipped with a first shut-off valve, a filter, a second shut-off valve, a sleeve-guided single-seat regulating valve, a third shut-off valve, and a check valve in sequence according to the desuperheating water flow direction. The downstream pipeline of the check valve is connected to a high-flow-rate atomizing nozzle device. This forms a complete desuperheating water control link. The shut-off valve is used to control the on / off state. The setting of multiple shut-off valves can realize the on / off control at different positions, providing support for flexible switching of bypass or branch lines. The filter can prevent impurities from clogging the nozzles, and the check valve can prevent the desuperheating water from flowing back, ensuring the safety of unidirectional flow in the system. The sleeve-guided single-seat regulating valve controls the desuperheating water volume, ensuring a stable and reliable desuperheating effect.

[0011] As a preferred technical approach: a sewage branch pipeline is connected downstream of the sleeve-guided single-seat regulating valve on the desuperheating water supply pipeline. Two fourth shut-off valves are sequentially installed on the sewage branch pipeline according to the sewage flow direction. These valves can be periodically opened to discharge rust debris, scale, and other particles from the pipeline, preventing impurities from clogging nozzles or wearing down valves. Simultaneously, by controlling the opening degree of the two shut-off valves, transient pressure fluctuations during desuperheating water regulation can be flexibly released, ensuring the stable operation of the desuperheating water system.

[0012] As a preferred technical approach: the desuperheating water supply pipeline is equipped with a backup bypass. The upstream port of the backup bypass is connected between the filter and the second shut-off valve, and the downstream port of the backup bypass is connected between the third shut-off valve and the check valve. A fifth shut-off valve is also provided on the backup bypass. When the main pipeline is shut down due to a fault or maintenance, desuperheating water can be temporarily and continuously supplied through the path of filter → backup bypass → check valve, avoiding steam overheating caused by interruption of the desuperheating function and ensuring the redundancy and continuity of the desuperheating system.

[0013] Beneficial effects: 1. In terms of safety protection, the solution adopts a "dual redundancy + tiered protection" design concept: two sets of vertically stacked double-link spring safety valves are installed at the outlet of the pressure-reducing and temperature-reducing mixing pipeline. Each set has two safety valves that serve as backups for each other, effectively preventing pressure relief failure caused by a single valve due to jamming, wear, or other malfunctions. The two sets of safety valves are arranged sequentially according to different set pressures, allowing for stepped pressure relief based on the degree of overpressure. This prevents excessive discharge and energy waste during minor overpressure and enables rapid pressure reduction through coordinated action during severe overpressure, fundamentally eliminating safety accidents such as pipeline rupture and equipment explosion. Simultaneously, the steam pipeline uses a high-strength alloy steel shell, which can withstand long-term erosion and corrosion from high-pressure steam, further enhancing the structural safety of the system.

[0014] 2. Regarding desuperheating and pressure reduction efficiency and parameter stability, the solution achieves control through component collaboration: the pilot-operated low-noise sleeve regulating valve at the inlet end can smoothly reduce steam pressure, minimizing the impact of pressure fluctuations on downstream equipment; the high-flow atomizing nozzle efficiently atomizes the desuperheating water, and in conjunction with the downstream honeycomb porous plate temperature distribution mechanism, it can completely eliminate local temperature gradients, ensuring uniform and stable steam temperature. The pressure transmitter and integrated temperature transmitter on the outlet pipeline provide real-time parameter feedback, providing signals to the control system to dynamically adjust the valve opening and water spray volume, ensuring that steam parameters always strictly match downstream process requirements, avoiding equipment efficiency reduction or damage due to parameter deviations.

[0015] 3. Regarding system reliability and ease of maintenance, the downstream drain branch of the sleeve-guided single-seat regulating valve can periodically discharge rust debris, scale, and other particles to prevent nozzle blockage or valve wear. Simultaneously, two fourth shut-off valves release transient pressure fluctuations, ensuring a stable supply of desuperheating water. The backup bypass allows for rapid switching during main line failures or maintenance, ensuring a continuous supply of desuperheating water and preventing steam overheating caused by desuperheating interruptions, thus reducing downtime losses. Furthermore, the entire unit is integrated via a skid-mounted base, with a compact layout of components. Combined with sliding supports to compensate for thermal expansion and contraction, this not only facilitates on-site installation and relocation but also significantly reduces the difficulty and cost of daily maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0017] Figure 2 This is a top view of the structure of this utility model.

[0018] In the diagram: 1. Desuperheating water supply pipeline; 2. Inlet pipeline; 3. Pressure reducing and desuperheating mixing pipeline; 4. Outlet pipeline; 5. Pilot-operated low-noise sleeve regulating valve; 6. High-flow atomizing nozzle device; 7. First shut-off valve; 8. Filter; 9. Second shut-off valve; 10. Sleeve-guided single-seat regulating valve; 11. Third shut-off valve; 12. Check valve; 13. First spring safety valve; 14. Second spring safety valve; 15. Pressure transmitter; 16. Integrated temperature transmitter; 17. Skid-mounted base; 18. Sliding support; 19. Sewage branch pipeline; 20. Fourth shut-off valve; 21. Backup bypass; 22. Fifth shut-off valve. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1 like Figure 1 , Figure 2 As shown, a steam desuperheating and pressure reducing device with multiple safety protections includes a steam pipeline and a desuperheating water supply pipeline 1. From left to right, the steam pipeline includes an inlet pipeline 2 for inputting high-temperature, high-pressure steam, a desuperheating and pressure reducing mixing pipeline 3 for depressurizing and cooling the steam, and an outlet pipeline 4 for outputting treated steam. At the inlet end of the desuperheating and pressure reducing mixing pipeline 3, a pilot-operated low-noise sleeve regulating valve 5 and a high-flow-rate atomizing nozzle device 6 are sequentially installed in the steam flow direction. On the desuperheating water supply pipeline 1, in the desuperheating water flow direction, a first shut-off valve 7, a filter 8, a second shut-off valve 9, a sleeve-guided single-seat regulating valve 10, a third shut-off valve 11, and a check valve 12 are sequentially installed. The downstream pipeline of the check valve 12 is connected to the high-flow-rate atomizing nozzle device 6. At the outlet end of the desuperheating and pressure reducing mixing pipeline 3, in the steam flow direction, a first spring safety valve 13 and a second spring safety valve 14 are sequentially installed, each spring safety valve employing a vertically stacked double-connected structure. A pressure transmitter 15 and an integrated temperature transmitter 16 are installed on the outlet pipeline 4. The steam pipeline and the desuperheating water supply pipeline 1 are connected to the skid-mounted base 17 of the channel steel frame structure via multiple supports. The pipeline to which the second spring safety valve 14 belongs, located on the side adjacent to the outlet pipeline 4, is mounted on the sliding support 18. In this embodiment, the steam pipeline is arranged at a height of 500mm above the upper surface of the skid-mounted base 17, and the desuperheating water supply pipeline 1 is arranged at a height of 300mm above the upper surface of the skid-mounted base 17.

[0021] To achieve a more uniform temperature distribution of the outlet steam, a temperature distribution mechanism is installed inside the pressure-reducing and temperature-reducing mixing pipeline 3 downstream of the high-flow-rate atomizing nozzle device 6. This mechanism performs secondary mixing of the initially cooled steam, eliminating localized temperature gradients caused by uneven atomization, resulting in a more uniform outlet steam temperature distribution. This prevents thermal stress damage to downstream equipment due to temperature fluctuations and ensures process stability.

[0022] To achieve a uniform temperature distribution mechanism, a three-stage perforated plate is used to isolate the pipeline, with the holes on each plate evenly distributed in a honeycomb pattern. This honeycomb perforated plate structure ensures that steam can only pass through the holes, dispersing the steam flow into multiple fine streams and forcing them to mix. Through the progressive turbulence effect of the perforated structure, temperature differences are efficiently eliminated, and the honeycomb distribution of the holes further facilitates flow field homogenization, further enhancing the temperature distribution effect.

[0023] To enhance the pressure resistance and wear resistance of the pipeline, the steam pipeline uses a high-strength alloy steel outer shell. This allows it to withstand long-term erosion and high-temperature corrosion from high-pressure, high-flow-rate steam, significantly improving the pipeline's pressure resistance and wear resistance, extending the overall service life of the equipment, and reducing safety risks caused by pipeline material failure.

[0024] During operation, high-temperature, high-pressure steam first enters the device through inlet pipe 2 and flows along the steam pipeline to the pressure-reducing and cooling mixing pipeline 3. At the inlet of the pressure-reducing and cooling mixing pipeline 3, the steam first flows through the pilot-operated low-noise sleeve regulating valve 5, where the throttling structure inside the valve achieves initial pressure reduction, steadily lowering the steam pressure to near the target range. Subsequently, the pressure-reduced high-temperature steam enters the area of ​​the high-flow-rate atomizing nozzle device 6. At this time, the cooling water supply pipeline 1 starts working simultaneously: the cooling water passes sequentially through the opened first shut-off valve 7, filter 8, second shut-off valve 9, sleeve-guided single-seat regulating valve 10, third shut-off valve 11, and check valve 12. After the cooling water passes through the filter 8 to filter impurities, the cooling water flow rate is regulated by the sleeve-guided single-seat regulating valve 10, and the check valve 12 prevents steam from flowing back into the cooling water supply pipeline. Finally, the steam is atomized into fine water droplets through the high-flow-rate atomizing nozzle device 6, fully mixing with the high-temperature steam and absorbing heat to achieve initial cooling.

[0025] After initial cooling, the steam continues to flow downstream of pressure-reducing and cooling mixing pipe 3, passing through an internally designed three-stage honeycomb porous plate temperature distribution mechanism. The steam must pass through the honeycomb holes of the porous plate, be dispersed into multiple fine streams, and undergo forced secondary mixing. Through step-by-step turbulence, local temperature gradients are completely eliminated, ensuring uniform and stable steam temperature.

[0026] Before the de-temperatured and depressurized steam enters the outlet pipeline 4, it passes through two vertically stacked double-valve structures: a first spring safety valve 13 and a second spring safety valve 14. These two safety valves operate in stages according to preset pressure settings: if the steam pressure slightly exceeds the safety threshold, the upstream first spring safety valve 13 activates first, quickly releasing some pressure through the redundant design of the double valves; if the pressure continues to rise and exceeds a higher threshold, the downstream second spring safety valve 14 immediately activates, providing double protection to prevent system overpressure. Simultaneously, the pressure transmitter 15 and integrated temperature transmitter 16 on the outlet pipeline 4 monitor the steam pressure and temperature parameters in real time, feeding the signals back to the control system to dynamically adjust the opening of the pilot-operated low-noise sleeve regulating valve 5 and the flow rate of the sleeve-guided single-seat regulating valve 10, ensuring that the outlet steam parameters stably match the downstream process requirements.

[0027] In this embodiment, the pilot-operated low-noise sleeve regulating valve 5 is equipped with a multi-stage throttling assembly, including multiple throttling valve plates connected in series. Each throttling valve plate has a throttling orifice with a different diameter and shape, and the orifice diameter gradually increases along the fluid flow direction. This design allows the high-pressure fluid to gradually decrease in pressure as it passes through the multi-stage throttling valve plates, avoiding sudden pressure changes that could impact the device. For example, the first-stage throttling valve plate has a smaller orifice diameter, providing initial throttling and pressure reduction for the high-pressure fluid. Subsequent stages of the throttling valve plate further adjust the degree of throttling according to changes in fluid pressure, ultimately stabilizing the fluid pressure to the target value.

[0028] In this embodiment, the atomizing nozzle of the high-flow-rate atomizing nozzle device 6 consists of multiple atomizing nozzles evenly distributed around the surface. The nozzles are distributed on the cross-section of the fluid channel, and the spray direction of the nozzles forms a 45-degree angle with the fluid flow direction. The nozzles use fine atomization technology, which can atomize the desuperheating water into tiny water droplets with an average particle size between 50-100μm. This ensures full contact with the high-temperature steam in the depressurization and desuperheating mixing pipeline 3. When the high-temperature and high-pressure fluid passes through the atomizing nozzle, the tiny water droplets sprayed from the atomizing nozzle quickly mix with the high-temperature steam, absorb heat, and achieve cooling.

[0029] This device achieves uniform and efficient cooling of high-temperature steam. At the same time, it utilizes two sets of vertically stacked double-connected structures at the outlet end to form a graded overpressure protection. With the real-time monitoring and dynamic adjustment of the pressure transmitter 15 and the integrated temperature transmitter 16, it ensures that the steam parameters stably match the downstream process requirements. Through the filtration, check valve and structural optimization of the desuperheating water supply pipeline 1 and the skid-mounted base 17, the whole system achieves safe, stable, desuperheating and pressure reduction of steam under high pressure and high flow conditions, significantly improving the safety, reliability and maintenance convenience of the system.

[0030] Example 2 Unlike the previous embodiment, a sewage branch pipe 19 is connected downstream of the sleeve-guided single-seat regulating valve 10 on the desuperheating water supply pipe 1. Two fourth shut-off valves 20 are sequentially installed on the sewage branch pipe according to the sewage flow direction. During normal operation, both fourth shut-off valves 20 are closed, and the sewage branch pipe 19 remains closed, ensuring that the desuperheating water flows normally to the high-flow-rate atomizing nozzle device 6 to participate in the steam desuperheating process. The pipe can be periodically opened to discharge rust debris, scale, and other particles, preventing impurities from clogging the nozzles or wearing down the valves. Simultaneously, by controlling the opening degree of the two shut-off valves, transient pressure fluctuations during desuperheating water regulation can be flexibly released, ensuring the stable operation of the desuperheating water system.

[0031] Example 3 Unlike embodiments one or two above, the desuperheating water supply pipeline 1 is equipped with a backup bypass 21. The upstream port of the backup bypass 21 is connected between the filter 8 and the second shut-off valve 9, and the downstream port of the backup bypass 21 is connected between the third shut-off valve 11 and the check valve 12. A fifth shut-off valve 22 is provided on the backup bypass 21. When the main pipeline is shut down due to a fault or maintenance, desuperheating water can be temporarily and continuously supplied through the path of filter 8 → backup bypass 21 → check valve 12 to avoid steam overheating caused by interruption of the desuperheating function and to ensure the redundancy and continuity of the desuperheating system.

[0032] The steam desuperheating and depressurization device with multiple safety protections shown above is a specific embodiment of this utility model, which has demonstrated the substantial features and progress of this utility model. According to actual use needs, equivalent modifications in shape, structure, etc. can be made to it under the guidance of this utility model, all of which are within the protection scope of this solution.

Claims

1. A steam desuperheating and depressurization device with multiple safety protections, comprising a steam pipeline and a desuperheating water supply pipeline, wherein the steam pipeline includes an inlet pipeline for inputting high-temperature and high-pressure steam, a depressurization and desuperheating mixing pipeline for depressurizing and desuperheating the steam, and an outlet pipeline for outputting the treated steam, wherein: The inlet end of the pressure-reducing and temperature-reducing mixing pipeline is equipped with a pilot-operated low-noise sleeve regulating valve and a high-flow atomizing nozzle device in sequence according to the steam flow direction. The temperature-reducing water supply pipeline is connected to the high-flow atomizing nozzle device. The outlet end of the pressure-reducing and temperature-reducing mixing pipeline is equipped with a first spring safety valve and a second spring safety valve in sequence according to the steam flow direction. Each set of spring safety valves adopts a vertically stacked double structure.

2. The steam desuperheating and depressurization device with multiple safety protections according to claim 1, characterized in that: The outlet pipeline is equipped with a pressure transmitter and an integrated temperature transmitter.

3. A steam desuperheating and depressurization device with multiple safety protections according to claim 2, characterized in that: A temperature distribution mechanism is provided inside the pressure-reducing and temperature-reducing mixing pipeline downstream of the high-flow atomizing nozzle device to make the temperature distribution more uniform.

4. A steam desuperheating and depressurization device with multiple safety protections according to claim 3, characterized in that: The temperature distribution mechanism uses several perforated plates, with the holes on each plate evenly distributed in a honeycomb pattern.

5. A steam desuperheating and depressurization device with multiple safety protections according to claim 4, characterized in that: The steam pipeline has a shell made of high-strength alloy steel.

6. A steam desuperheating and depressurization device with multiple safety protections according to claim 5, characterized in that: The steam pipeline and the desuperheating water supply pipeline are connected to the skid-mounted base of the channel steel frame structure through multiple supports, wherein the pipeline of the second spring safety valve on the side adjacent to the outlet pipeline is set on the sliding support.

7. A steam desuperheating and depressurization device with multiple safety protections according to claim 1, characterized in that: The desuperheating water supply pipeline is provided with a first shut-off valve, a filter, a second shut-off valve, a sleeve-guided single-seat regulating valve, a third shut-off valve, and a check valve in sequence according to the direction of desuperheating water flow. The downstream pipeline of the check valve is connected to a high-flow atomizing nozzle device.

8. A steam desuperheating and depressurization device with multiple safety protections according to claim 7, characterized in that: The cooling water supply pipeline is connected to a sewage branch pipeline downstream of the sleeve-guided single-seat regulating valve. Two fourth shut-off valves are installed on the sewage branch pipeline in sequence according to the flow direction.

9. A steam desuperheating and depressurization device with multiple safety protections according to claim 7, characterized in that: The desuperheating water supply pipeline is equipped with a backup bypass. The upstream port of the backup bypass is connected between the filter and the second shut-off valve, and the downstream port of the backup bypass is connected between the third shut-off valve and the check valve. The backup bypass is equipped with a fifth shut-off valve.

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