A boiler superheated steam attemperator

Abstract

The utility model discloses a kind of boiler superheated steam temperature reducing device, the device includes: steam processing unit and temperature reducing water supply unit;The steam processing unit includes steam temperature reducer;The steam temperature reducer is Venturi temperature reducer;The temperature reducing water supply unit includes temperature reducing water tank, temperature reducing water conveying pipeline and temperature reducing water adjusting pipeline connected in turn;The output end of temperature reducing water adjusting pipeline is connected steam temperature reducer.The utility model reduces superheated steam temperature, realizes heat energy source utilization maximization, reaches heat conduction efficiency maximization, reduces heat conduction area, reduces energy loss.The utility model improves the saturated steam heating efficiency when operating, ensures to reduce heat conduction area, realizes temperature realizes the utilization maximization of energy, reduces energy consumption, and heating efficiency is high, weakening feels and equipment loss, and steam is stable, improve the service period of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of boiler steam treatment equipment, and relates to a boiler superheated steam de-heating device, which is used to cool superheated steam after steam sulfidation to saturated steam to stabilize the energy consumption of downstream equipment, downstream pipelines and equipment, etc. Background Technology

[0002] Superheated steam refers to steam with a temperature higher than its saturation temperature; the portion above the saturation temperature is called superheat. Referring to the saturated steam table (thermodynamic properties of water vapor), taking a pressure of 7 barg as an example, the temperature of saturated steam is 170℃. Steam exceeding this temperature is called superheated steam.

[0003] Superheated steam has the following characteristics: 1) Compared to the saturated portion, the superheated portion of steam contains a very small heat capacity; 2) Superheated steam has a low heat transfer coefficient; 3) The temperature gradient of the heat exchange surface is large; 4) It requires a larger heat exchange area. For example... Figure 1 As shown, the overall heat transfer coefficient (U-value) of saturated steam and superheated steam is their main difference. The U-value of superheated steam varies depending on the process, but is much smaller than that of saturated steam. It is difficult to predict the U-value of superheated steam, but generally, the higher the degree of superheat, the smaller the U-value. In most cases, for horizontal steam coil heat exchangers, the U-value of superheated steam is typically 50 to 100 W / (m²). 2 ·℃), while saturated steam is 1200W / (m³). 2 ·℃).

[0004] This means that when superheated steam enters the heat exchanger, the first part to come into contact with it will cool the superheated steam. At this point, the heat released by the superheated part of the steam is very low. Only when the temperature of the superheated steam drops to the saturation temperature does it begin to release a large amount of heat to heat the secondary side. Figure 2 As shown. The higher the superheat of the superheated steam, the larger the heat exchange area required and the longer the heating time. Therefore, we need to reduce the superheated steam to its saturation temperature before it enters the heat exchanger.

[0005] Currently, the boiler's superheated steam temperature is too high, and occasional pressure instability occurs, leading to excessive pipeline losses and leaks. Furthermore, after the superheated steam cools down, instability still occurs occasionally, causing downstream equipment and valves to overheat, resulting in system instability and energy waste.

[0006] Therefore, decooling superheated steam is necessary in the following ways: decooling to saturation temperature can improve heat transfer efficiency, reduce heat exchange area and heating time; it can stabilize steam parameters, avoid excessive temperature and pressure fluctuations that exacerbate damage and corrosion to pipelines and equipment, reduce leakage and failure, and extend service life; it can stabilize the steam temperature within ±3℃ of saturation temperature, ensuring stable operation of downstream equipment and maintaining production continuity; it can also reduce ineffective energy consumption, allowing steam to release a large amount of latent heat, maximizing energy utilization and reducing energy costs.

[0007] Existing superheated steam desuperheating devices are mainly divided into non-contact desuperheating devices and contact desuperheating devices.

[0008] Non-contact desuperheating devices use a cooling medium that does not directly contact the steam being cooled. Low-temperature liquids or gases, such as air, can be used as the cooling medium. Examples of this type of desuperheater include shell-and-tube heat exchangers. Superheated steam enters one side of the heat exchanger, while the cooling medium enters the other side. The outlet temperature of the superheated steam is controlled by adjusting the inlet flow rate of the superheated steam or the flow rate of the cooling medium. The advantages of this method are fast response and the ability to withstand high temperatures and pressures. The disadvantages are large size, high cost, and the significant thermal resistance caused by fouling and air films on the heat exchanger surface. Therefore, non-contact desuperheating devices are now largely obsolete, replaced by direct-contact desuperheaters.

[0009] The working principle of a direct contact desuperheater is to add a certain amount of water to the superheated steam through the mixing device of the desuperheater. The water absorbs heat from the superheated steam and evaporates, thus lowering the temperature of the superheated steam. Direct contact desuperheaters are further divided into many types, such as water bath type, water spray type, water jet type, axial jet type, venturi type, steam atomization type, and variable orifice plate type.

[0010] During the operation of industrial boilers, the temperature of superheated steam often exceeds the range required by the process, necessitating the use of desuperheating devices to reduce it to the target temperature. Existing desuperheating devices generally suffer from the following problems: low desuperheating accuracy, making it difficult to stably control the steam outlet temperature; inadequate safety protection mechanisms, making them prone to equipment failure due to abnormal pressure or water backflow; and inconvenient system maintenance, requiring frequent shutdowns for filter cleaning and pipeline repairs, thus impacting production efficiency. Therefore, there is an urgent need for a boiler superheated steam desuperheating device that offers precise control, safety, reliability, and ease of maintenance. Utility Model Content

[0011] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a boiler superheated steam desuperheating device. The device is based on a Venturi desuperheater and uses a pipeline to throttle the superheated steam. The superheated steam generates high-speed flow and turbulence at the desuperheating water inlet, so as to fully mix the desuperheating water and the superheated steam to improve the efficiency of the desuperheating process.

[0012] To achieve the above objectives, this utility model provides the following technical solution: One of the technical solutions of this utility model is to provide a boiler superheated steam desuperheating device, which includes: a steam treatment unit and a desuperheating water supply unit; The steam treatment unit includes a steam desuperheater; the steam desuperheater is a Venturi desuperheater. The desuperheating water supply unit includes a desuperheating water tank, a desuperheating water delivery pipeline, and a desuperheating water regulating pipeline connected in sequence. The output end of the desuperheating water regulating pipeline is connected to a steam desuperheater.

[0013] Furthermore, the steam treatment unit also includes a steam input pipeline and a steam output pipeline; the output end of the steam input pipeline is connected to the steam inlet of the steam desuperheater; the input end of the steam output pipeline is connected to the steam outlet of the steam desuperheater. A steam pressure gauge, a steam shut-off valve, and a steam filter are sequentially installed along the steam flow direction on the steam input pipeline; a steam pressure sensor and a steam temperature sensor are sequentially installed along the steam flow direction on the steam output pipeline.

[0014] Furthermore, the top of the desuperheating water tank is equipped with an overflow valve, and the bottom is equipped with a drain valve.

[0015] Furthermore, the input end of the desuperheating water delivery pipeline is connected to the bottom of the desuperheating water tank. Two desuperheating water delivery pipelines are arranged in parallel. Each pipeline is provided with a desuperheating water pump inlet shut-off valve, a desuperheating water tank inlet filter, a desuperheating water pump, a desuperheating water pump outlet check valve, and a desuperheating water tank outlet shut-off valve in sequence along the water flow direction. A desuperheating water return valve is also connected in parallel between the desuperheating water tank and the desuperheating water delivery pipeline. One end of the desuperheating water return valve is connected to the top of the desuperheating water tank, and the other end is connected to the output end of the desuperheating water tank outlet shut-off valve.

[0016] Furthermore, the input end of the desuperheating water regulating pipeline is connected to the output end of the desuperheating water conveying pipeline, and the output end is connected to the desuperheating water inlet of the steam desuperheater; the desuperheating water regulating pipeline is provided with a desuperheating water regulating check valve, a desuperheating water regulating filter, a desuperheating water regulating valve and a desuperheating water regulating shut-off valve in sequence along the water flow direction, and a desuperheating water regulating bypass valve is provided in parallel with the desuperheating water regulating pipeline.

[0017] Furthermore, a desuperheating water pressure gauge is connected to the input and output ends of the desuperheating water regulating pipeline.

[0018] Furthermore, the output end of the desuperheating water regulating pipeline is connected to the desuperheating water inlet of the steam desuperheater, and a desuperheating water check valve is installed on the connection section between the desuperheating water regulating pipeline and the steam desuperheater.

[0019] Furthermore, the boiler superheated steam desuperheating device also includes a monitoring unit and a control unit; the monitoring unit is integrated into the steam processing unit and the desuperheating water supply unit; the control unit is used to receive sensor signals and control the operation of the water pump and valves.

[0020] Furthermore, the monitoring unit includes the aforementioned steam pressure gauge, steam pressure sensor, steam temperature sensor, and desuperheating water pressure gauge; the control unit is a steam desuperheating system control cabinet, which is electrically connected to the steam pressure sensor, steam temperature sensor, desuperheating water pump, and desuperheating water regulating valve, respectively.

[0021] Compared with the prior art, the present invention has at least the following improvements and beneficial effects: (1) This utility model reduces the temperature of superheated steam, maximizes the utilization of thermal energy, maximizes the heat conduction efficiency, reduces the heat conduction area, and reduces energy loss.

[0022] (2) This utility model improves the saturated steam heating efficiency during operation, ensures a reduction in heat conduction area, maximizes energy utilization, reduces energy consumption, and has high heating efficiency, reduces sensor and equipment wear, and provides stable steam, thus extending the service life of the equipment. Attached Figure Description

[0023] Figure 1 A comparative schematic diagram of water-circled steam coil heat exchange structures for saturated steam and superheated steam. Figure 2 This is a schematic diagram illustrating the heat exchange process and heat transfer coefficient (U value) characteristics of superheated steam passing through a steam coil surrounded by water. Figure 3 Schematic diagram of a boiler superheated steam desuperheating device; Figure label: 1. Steam pressure gauge; 2. Steam shut-off valve; 3. Steam filter; 4. Steam desuperheater; 5. Steam pressure sensor; 6. Steam temperature sensor; 7. Desuperheating water check valve; 8. Desuperheating water tank overflow valve; 9. Desuperheating water tank; 10. Desuperheating water tank drain valve; 11. Desuperheating water return valve; 12. Desuperheating water pump inlet shut-off valve; 13. Desuperheating water tank inlet filter; 14. Desuperheating water pump; 15. Desuperheating water pump outlet check valve; 16. Desuperheating water tank outlet shut-off valve; 17. Desuperheating water pressure gauge; 18. Desuperheating water pre-regulation check valve; 19. Desuperheating water regulating filter; 20. Desuperheating water regulating valve; 21. Desuperheating water post-regulation shut-off valve; 22. Desuperheating water regulating bypass valve; 23. Steam desuperheating system filter. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to specific embodiments. It should be noted that the following embodiments will help those skilled in the art to further understand this utility model, but do not limit this utility model in any way. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model. These all fall within the protection scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Example 1: A boiler superheated steam desuperheating device like Figure 3 As shown in the figure, this embodiment provides a boiler superheated steam desuperheating device, which includes a steam treatment unit and a desuperheating water supply unit.

[0027] The steam processing unit includes a steam input pipeline, a steam desuperheater 4, and a steam output pipeline. A steam pressure gauge 1, a steam shut-off valve 2, and a steam filter 3 are sequentially installed along the steam flow direction on the steam input pipeline, and the output end of the steam input pipeline is connected to the steam inlet of the steam desuperheater 4. A steam pressure sensor 5 and a steam temperature sensor 6 are sequentially installed along the steam flow direction on the steam output pipeline, and the input end of the steam output pipeline is connected to the steam outlet of the steam desuperheater 4. The desuperheating water supply unit includes a desuperheating water tank 9, a desuperheating water delivery pipeline, and a desuperheating water regulating pipeline. The desuperheating water tank 9 has an overflow valve 8 at its top and a drain valve 10 at its bottom. The input end of the desuperheating water delivery pipeline is connected to the bottom of the desuperheating water tank 9. Two desuperheating water delivery pipelines are connected in parallel. Each pipeline, along the water flow direction, is sequentially equipped with a desuperheating water pump inlet shut-off valve 12, a desuperheating water tank inlet filter 13, a desuperheating water pump 14, a desuperheating water pump outlet check valve 15, and a desuperheating water tank outlet shut-off valve 16. A desuperheating water return valve 11 is also connected in parallel between the desuperheating water tank 9 and the desuperheating water delivery pipeline. One end of the desuperheating water return valve 11 is connected to the top of the desuperheating water tank 9, and the other end is connected to the output end of the desuperheating water tank outlet shut-off valve 16. The input end of the desuperheating water regulating pipeline is connected to the output end of the desuperheating water delivery pipeline, and the output end is connected to the desuperheating water inlet of the steam desuperheater 4. Along the water flow direction, the pipeline is sequentially equipped with a desuperheating water regulating check valve 18, a desuperheating water regulating filter 19, a desuperheating water regulating valve 20, and a desuperheating water regulating shut-off valve 21. A desuperheating water regulating bypass valve 22 is also connected in parallel with the desuperheating water regulating pipeline. A desuperheating water pressure gauge 17 is connected to both the input and output ends of the desuperheating water regulating pipeline. The output end of the desuperheating water regulating pipeline is connected to the desuperheating water inlet of the steam desuperheater 4, and a desuperheating water check valve 7 is installed at the connection point between the desuperheating water regulating pipeline and the steam desuperheater 4.

[0028] This embodiment provides a boiler superheated steam desuperheating device, which also includes a monitoring unit and a control unit.

[0029] The monitoring unit includes the aforementioned steam pressure gauge 1, steam pressure sensor 5, steam temperature sensor 6, and desuperheating water pressure gauge 17; the monitoring unit is integrated into the steam treatment unit and the desuperheating water supply unit.

[0030] The control unit is a steam desuperheating system control cabinet 23, which is electrically connected to the steam pressure sensor 5, the steam temperature sensor 6, the desuperheating water pump 14, and the desuperheating water regulating valve 20. The steam desuperheating system control cabinet 23 is used to receive sensor signals and control the operation of the water pump and valve.

[0031] The steam desuperheater 4 used in this embodiment is a Venturi desuperheater, which has the following advantages: excellent atomization effect, allowing steam and desuperheating water to mix thoroughly, avoiding the large amount of condensate produced after multiple desuperheaters, ensuring good steam dryness, and benefiting the operation of downstream steam-using equipment. Its operating principle is simple, with no moving parts. It can precisely control the temperature of superheated steam, typically about 3°C ​​above the saturation temperature. It is suitable for applications with stable and variable steam conditions, and compared to water-spray type desuperheaters, it causes much less wear on downstream pipelines. The steam regulation ratio reaches 5:1, and the desuperheating water regulation ratio exceeds 20:1, meaning the ratio of the maximum steam flow rate to the minimum steam flow rate can reach 5:1.

[0032] From the perspective of protecting equipment and saving costs, the advantages of Venturi desuperheaters are mainly reflected in the following aspects: (1) Reduce equipment wear: Through precise and uniform desuperheating, the steam temperature is avoided from causing overheating damage, oxidation corrosion or scaling to downstream equipment (such as valves, pipelines, heat exchangers, etc.), thus extending the service life and maintenance cycle of the equipment. (2) Stabilize system operating conditions: Maintain the steam temperature within the set range, ensure that downstream equipment (such as steam turbines, reactors, etc.) operate under the design parameters, reduce equipment vibration and efficiency reduction caused by temperature fluctuations, and improve the overall system stability. (3) Reduce energy consumption: The efficient hybrid desuperheating design reduces the ineffective loss of steam during the desuperheating process (such as energy waste caused by excessive pressure drop), while ensuring stable steam parameters, making the downstream equipment operate more efficiently, and indirectly reducing the overall energy consumption cost. (4) Reduce maintenance costs: The equipment itself is durable and wear-free, with a long maintenance cycle, reducing the number of shutdowns for maintenance and the cost of spare parts replacement; at the same time, the protection of downstream equipment also reduces the maintenance and replacement expenses of other equipment. (5) Reduce operational risk costs: The risks of production interruption and product quality problems caused by temperature control failure are reduced, avoiding hidden costs such as rework and downtime losses.

[0033] Example 2 This embodiment provides the boiler superheated steam desuperheating device of Embodiment 1, and, in conjunction with the working characteristics of the Venturi desuperheater, details its usage, including preparation, desuperheating process, and shutdown maintenance: (1) Preparation stage: Check the initial status of each valve, start the steam desuperheating system control cabinet 23, and initialize the steam pressure gauge 1, steam pressure sensor 5, steam temperature sensor 6, and desuperheating water pressure gauge 17 to ensure normal signal transmission from the monitoring unit. Confirm that the water level in the desuperheating water tank 9 is normal (this can be determined by the observation device next to the overflow valve or the level sensor); if the water level is insufficient, add water to the tank through an external water supply device. When adding water, open the bypass pipeline of the desuperheating water tank overflow valve 8 (or utilize the characteristics of the overflow valve itself) to prevent overpressure in the tank.

[0034] Slowly open the steam shut-off valve 2, and the superheated steam passes through the following in sequence: steam pressure gauge 1 (to monitor the initial steam pressure in real time and ensure that the pressure is within the rated range of the equipment), steam filter 3 (to filter impurities such as rust and dust carried in the steam to avoid clogging the desuperheater or affecting the desuperheating effect), and finally enters the steam inlet of the Venturi desuperheater 4.

[0035] Open the inlet shut-off valve 12 of the desuperheating water pump and the outlet shut-off valve 16 of the desuperheating water tank, and start the desuperheating water pump 14: the desuperheating water is drawn from the bottom of the desuperheating water tank 9, filtered by the inlet filter 13 of the desuperheating water tank, and then pressurized and delivered by the desuperheating water pump 14; the outlet check valve 15 of the desuperheating water pump prevents the desuperheating water from flowing back and ensures the safety of the pump and pipeline; the outlet pressure of the desuperheating water pump 14 can be adjusted by the desuperheating water return valve 11 (if the pressure is too high, open the return valve to allow some of the desuperheating water to flow back to the water tank to maintain stable pressure).

[0036] (2) The cooling process includes several independent processes. The Venturi desuperheater achieves precise cooling through three stages: "preliminary atomization → deep mixing → final evaporation". The specific process is as follows: Phase 1: Initial atomization and desuperheating within the diffuser of the Venturi desuperheater. Open the pre-regulation check valve 18, the desuperheating water regulating valve 20, and the post-regulation shut-off valve 21 (if the desuperheating water regulating valve 20 malfunctions, switch to opening the desuperheating water regulating bypass valve 22). The desuperheating water, after being filtered again by the desuperheating water regulating filter 19, enters the desuperheating water inlet of the Venturi desuperheater 4 at a certain pressure (monitored by the desuperheating water pressure gauge 17). Inside the diffuser of the desuperheater, high-speed steam impacts and breaks up the injected desuperheating water, achieving initial atomization; the atomized water and steam begin heat exchange, and the steam temperature initially decreases. (The desuperheating water check valve 7 prevents the desuperheating water from flowing back into the pipeline when the steam pressure fluctuates, ensuring unidirectional flow of the desuperheating water.) The second stage: deep mixing and desuperheating within the main diffuser. The "saturated water mist," initially atomized by the internal diffuser, along with the remaining superheated steam, enters the main diffuser of the Venturi desuperheater. The main diffuser, through a "flow-limiting design," drastically increases the steam velocity, creating a strong turbulent field in this region. Under the influence of turbulence, the water mist and steam are thoroughly disturbed and mixed, significantly improving heat exchange efficiency and further reducing the steam temperature, thus completing the "deep desuperheating." During this stage, the steam desuperheating system control cabinet 23 receives signals from the steam temperature sensor 6 in real time: if the outlet steam temperature is higher than the target value, the control cabinet automatically increases the opening of the desuperheating water regulating valve 20 (or adjusts the bypass valve opening) to increase the desuperheating water flow; if the temperature is lower than the target value, the opening is reduced to achieve precise temperature control.

[0037] The third stage: final evaporative cooling in the downstream pipeline. The steam (containing a small amount of incompletely evaporated water droplets) mixed in the main diffuser enters the downstream pipeline at the outlet of the Venturi desuperheater 4. Inside the pipeline, the remaining water droplets continue to exchange heat with the steam, gradually evaporating completely into water vapor. Finally, the steam temperature stabilizes at a target value close to the saturation temperature + 3°C, continuously monitored and confirmed by the steam temperature sensor 6. The advantages of the Venturi structure: minimizing direct contact between the cooling water and the inner wall of the pipeline, reducing the risk of pipeline erosion, while ensuring thorough cooling.

[0038] (3) Shutdown maintenance After the cooling operation is completed, shut down the machine in the following order: close the cooling water regulating valve 20 (or cooling water regulating bypass valve 22), the cooling water pump inlet shut-off valve 12, and the cooling water tank outlet shut-off valve 16, then stop the cooling water pump 14; slowly close the steam shut-off valve 2 to cut off the steam supply. If the machine is to be shut down for an extended period, the cooling water tank drain valve 10 can be opened to drain the sediment at the bottom of the tank and keep the tank clean.

[0039] Regular maintenance: Regularly (e.g., once a month) disassemble the filter screens of steam filter 3, desuperheating water tank inlet filter 13, and desuperheating water regulating filter 19 to clean the trapped impurities and ensure smooth fluid flow; regularly check the sealing performance of steam shut-off valve 2 and desuperheating water regulating valve 20, and verify the accuracy of steam pressure gauge 1 and steam temperature sensor 6 to ensure the accuracy of monitoring and control.

[0040] Through the above steps, this device can achieve precise de-temperatureing of superheated steam. At the same time, by utilizing the advantages of the Venturi desuperheater, it ensures stable and low-loss operation of the system and meets the requirements of downstream steam-using equipment for steam parameters.

[0041] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A boiler superheated steam desuperheating device, characterized in that, The boiler superheated steam desuperheating device includes: a steam treatment unit and a desuperheating water supply unit; The steam treatment unit includes a steam desuperheater (4); the steam desuperheater (4) is a Venturi desuperheater; The desuperheating water supply unit includes a desuperheating water tank (9), a desuperheating water delivery pipeline, and a desuperheating water regulating pipeline connected in sequence. The output end of the desuperheating water regulating pipeline is connected to the steam desuperheater (4).

2. The boiler superheated steam desuperheating device according to claim 1, characterized in that, The steam treatment unit also includes a steam input pipeline and a steam output pipeline; the output end of the steam input pipeline is connected to the steam inlet of the steam desuperheater (4); the input end of the steam output pipeline is connected to the steam outlet of the steam desuperheater (4).

3. The boiler superheated steam desuperheating device according to claim 2, characterized in that, The steam input pipeline is provided with a steam pressure gauge (1), a steam shut-off valve (2) and a steam filter (3) in sequence along the steam flow direction; the steam output pipeline is provided with a steam pressure sensor (5) and a steam temperature sensor (6) in sequence along the steam flow direction.

4. The boiler superheated steam desuperheating device according to claim 1, characterized in that, The desuperheating water tank (9) is equipped with a desuperheating water tank overflow valve (8) at the top and a desuperheating water tank drain valve (10) at the bottom.

5. A boiler superheated steam desuperheating device according to claim 1, characterized in that, The input end of the desuperheating water delivery pipeline is connected to the bottom of the desuperheating water tank (9). Two desuperheating water delivery pipelines are connected in parallel. Each pipeline is provided with a desuperheating water pump inlet shut-off valve (12), a desuperheating water tank inlet filter (13), a desuperheating water pump (14), a desuperheating water pump outlet check valve (15), and a desuperheating water tank outlet shut-off valve (16) in sequence along the water flow direction. A desuperheating water return valve (11) is also connected in parallel between the desuperheating water tank (9) and the desuperheating water delivery pipeline. One end of the desuperheating water return valve (11) is connected to the top of the desuperheating water tank (9), and the other end is connected to the output end of the desuperheating water tank outlet shut-off valve (16).

6. A boiler superheated steam desuperheating device according to claim 5, characterized in that, The input end of the desuperheating water regulating pipeline is connected to the output end of the desuperheating water conveying pipeline, and the output end is connected to the desuperheating water inlet of the steam desuperheater (4); the desuperheating water regulating pipeline is provided with a desuperheating water regulating check valve (18), a desuperheating water regulating filter (19), a desuperheating water regulating valve (20) and a desuperheating water regulating shut-off valve (21) in sequence along the water flow direction, and a desuperheating water regulating bypass valve (22) is provided in parallel with the desuperheating water regulating pipeline.

7. A boiler superheated steam desuperheating device according to claim 6, characterized in that, The input and output ends of the desuperheating water regulating pipeline are respectively connected to a desuperheating water pressure gauge (17).

8. A boiler superheated steam desuperheating device according to claim 7, characterized in that, The output end of the desuperheating water regulating pipeline is connected to the desuperheating water inlet of the steam desuperheater (4), and a desuperheating water check valve (7) is provided on the connection section between the desuperheating water regulating pipeline and the steam desuperheater (4).

9. A boiler superheated steam desuperheating device according to claim 8, characterized in that, The boiler superheated steam desuperheating device also includes a monitoring unit and a control unit; the monitoring unit is integrated into the steam processing unit and the desuperheating water supply unit; the control unit is used to receive sensor signals and control the operation of the water pump and valves.

10. A boiler superheated steam desuperheating device according to claim 9, characterized in that, The monitoring unit includes the steam pressure gauge (1), steam pressure sensor (5), steam temperature sensor (6), and desuperheating water pressure gauge (17); the control unit is the steam desuperheating system control cabinet (23), which is electrically connected to the steam pressure sensor (5), steam temperature sensor (6), desuperheating water pump (14), and desuperheating water regulating valve (20), respectively.

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