Pressure reducing and steam supplementing device of steam turbine

Abstract

The invention discloses a decompression steam supplementing device of a steam turbine, and relates to the technical field of steam turbines. The medium-pressure steam turbine comprises a medium-pressure boiler, a steam turbine body and a water cooling box, a snakelike gas supplementing pipe is fixedly connected into the water cooling box, and one end of the snakelike gas supplementing pipe extends out of the snakelike gas supplementing pipe and is fixedly connected with the gas outlet end of the medium-pressure boiler. The S-shaped cooling pipe is arranged outside the S-shaped air supplementing pipe in a sleeving mode, cooling water opposite to the flowing direction of steam in the S-shaped air supplementing pipe is introduced into the S-shaped cooling pipe, efficient water cooling can be conducted on the steam, the backflow cooling water is atomized and sprayed out to the cooling fins through the atomizing nozzle, and the cooling effect is improved. According to the heat dissipation device, the atomization cooling water can exchange heat with the heat dissipation fins more efficiently, the cooling efficiency of the cooling water is improved, air flow in the heat dissipation box can be accelerated through the heat dissipation fan, heat on the surfaces of the heat dissipation fins can be rapidly brought out, the heat dissipation fins are kept at the low temperature, and efficient cooling of the cooling water is better guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and in particular to a steam turbine pressure reducing and steam supplementing device. Background Art

[0002] Steam engine is the abbreviation of steam engine and steam turbine. Steam engine originally refers to the general term for steam engine and steam turbine. The normal air supply of low-pressure steam-supplemented steam engine is 30t / h, but the low-pressure steam-supplemented steam engine has not been running smoothly, which is mainly manifested in the unstable operation of the steam production unit, resulting in large fluctuations in the steam pressure and temperature of the low-pressure steam network. At the same time, after passing through the superheater, it brings hidden dangers to the operation of the steam engine. After searching, the patent with application number 202321411828.7 discloses a reduced-pressure steam-supplemented device for steam engines, which specifically relates to the field of steam engine technology, including a steam engine body, a medium-pressure boiler and a water tank, a serpentine pipe is fixedly provided inside the water tank, both ends of the serpentine pipe pass through the water tank and are connected to the steam engine body and the medium-pressure boiler, coolant is stored inside the water tank, and a refrigeration component is provided at the rear end of the water tank for cooling the coolant, and the refrigeration component includes a box body, and a refrigeration plate is fixed inside the box body.

[0003] However, in actual use, the applicant found that when the coolant in the water tank is used to cool the steam inside the serpentine tube, the coolant is cooled indirectly by cooling the water tank, and the coolant in the water tank cannot flow. This will make it impossible for the coolant in the water tank away from the water tank to be cooled efficiently, which is not conducive to effectively cooling the steam inside the serpentine tube. In view of this, we propose a steam turbine pressure reducing and steam supplement device. Summary of the invention

[0004] The present invention provides a steam turbine pressure reducing and steam supplementing device to solve the defects in the prior art.

[0005] The present invention provides a pressure reducing and steam supplement device for a steam turbine, comprising: a medium-pressure boiler, a steam turbine body and a water cooling box, wherein a serpentine air supplement pipe is fixedly connected to the interior of the water cooling box, one end of the serpentine air supplement pipe extends to the outside of the serpentine air supplement pipe and is fixedly connected to the air outlet end of the medium-pressure boiler, the other end of the serpentine air supplement pipe extends to the outside of the serpentine air supplement pipe and is fixedly connected to the air inlet end of the steam turbine body, a control panel is fixedly installed on the front side of the water cooling box, a serpentine cooling pipe is arranged on the outer sleeve of the serpentine air supplement pipe inside the water cooling box, a water outlet branch pipe is fixedly arranged on the portion of the serpentine cooling pipe close to the air inlet end of the serpentine air supplement pipe, a water inlet branch pipe is fixedly arranged on the portion of the serpentine cooling pipe close to the air outlet end of the serpentine air supplement pipe, the lower ends of the water inlet branch pipe and the water outlet branch pipe both extend to the interior of the cooling box, the lower end of the water inlet branch pipe is communicated with the bottom of the inner side of the cooling box, and the lower end of the water outlet branch pipe is fixedly connected to the water inlet end of a water pump fixedly installed on the top of the inner side of the cooling box.

[0006] Preferably, an atomizing nozzle is fixedly connected at the center position of the inner top of the cooling box, and the water outlet end of the water pump is connected to the atomizing nozzle through a hose.

[0007] Preferably, heat dissipation fins are fixed side by side inside the cooling box, the heat dissipation fins are located below the atomizing nozzle, and the liquid level of the cooling water inside the cooling box is located below the heat dissipation fins.

[0008] Preferably, heat dissipation boxes are symmetrically arranged on the front and rear sides of the cooling box, and the front and rear ends of the heat dissipation fins extend into the heat dissipation boxes on the front and rear sides respectively.

[0009] Preferably, a cooling fan is fixedly installed in the heat dissipation box below the heat dissipation fins, and the cooling fan is electrically connected to the control panel through a wire.

[0010] Preferably, an air inlet window is provided at the bottom of the heat dissipation box, and an air outlet window is provided at the bottom of the heat dissipation box, and filters are fixedly provided on the air inlet window and the air outlet window.

[0011] Preferably, a solenoid valve is fixedly sleeved on the serpentine air supply pipe between the medium-pressure boiler and the water cooling box.

[0012] Preferably, the control panel is electrically connected to an external power source via a wire, and the solenoid valve and the water pump are electrically connected to the control panel via a wire, respectively.

[0013] Preferably, it also includes:

[0014] Temperature measurement module 1, used to measure the temperature value at the water inlet branch pipe;

[0015] Temperature measurement module 2, used to measure the temperature value at the water inlet of the serpentine cooling pipe;

[0016] Temperature measurement module three, used to measure the temperature value at the outlet of the serpentine cooling pipe;

[0017] A flow rate detection module is used to detect the real-time flow rate of cooling water in the serpentine cooling pipe;

[0018] An alarm module, used for issuing an alarm;

[0019] A calculation module 1, used for calculating the heat absorbed by the cooling water based on the temperature value at the water outlet branch pipe (72);

[0020] Calculation module 2, used for calculating the rated flow rate of cooling water based on calculation module 1;

[0021] A processing module, used for comparing the result obtained by the calculation module 2 with the real-time flow rate of the cooling water;

[0022] The control module, when the real-time flow rate of cooling water is greater than or equal to the rated flow rate of cooling water, the device works normally, and when the real-time flow rate of cooling water is less than the rated flow rate of cooling water, the control alarm module sounds an alarm.

[0023] Preferably, the calculation module 1 calculates based on the following formula 1:

[0024]

[0025] Q is the heat absorbed by the cooling water, π is the pi, d1 is the radius of the outer surface of the serpentine air supply pipe, l1 is the length of the outer surface of the serpentine air supply pipe, T2 is the preset temperature value at the outlet branch, T1 is the temperature value at the inlet branch detected by the temperature measurement module 1, h1 is the heat transfer coefficient of the cooling water, f is the friction factor between the cooling water and the outer surface of the serpentine air supply pipe, Re c is the Reynolds number of the serpentine cooling tube, Pr c is the Prandtl number of cooling water, γ1 is the thermal conductivity of cooling water, Pr d is the Prandtl number of the serpentine cooling tube, l2 is the length of the inner surface of the serpentine air supply tube, ε is the thickness of the serpentine cooling tube, and γ2 is the thermal conductivity of the serpentine cooling tube;

[0026] The calculation module 2 is calculated based on the following formula 2:

[0027]

[0028] V is the rated flow rate of cooling water, C is the specific heat capacity of cooling water, T3 is the temperature value at the water inlet of the serpentine cooling pipe, T4 is the temperature value at the water outlet of the serpentine cooling pipe, and d2 is the inner radius of the serpentine cooling pipe.

[0029] The present invention has the following beneficial effects:

[0030] The invention discloses a steam turbine pressure reducing and steam supplement device. By sleeve-arranging a serpentine cooling pipe on the outside of the serpentine air supplement pipe and introducing cooling water in the serpentine cooling pipe in a direction opposite to the steam flow direction inside the serpentine air supplement pipe, the steam can be efficiently water-cooled and cooled. The reflux cooling water is atomized and sprayed onto the heat dissipation fins through an atomizing nozzle, so that the atomized cooling water can more efficiently exchange heat with the heat dissipation fins, thereby improving the cooling efficiency of the cooling water. The heat dissipation fan can accelerate the air flow inside the heat dissipation box, thereby quickly taking out the heat on the surface of the heat dissipation fins and keeping the heat dissipation fins at a relatively low temperature, thereby better ensuring the efficient cooling of the cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the overall structure of a steam turbine pressure reducing and steam supplementing device of the present invention;

[0033] Figure 2 It is a schematic diagram of the internal structure of a water cooling box in a steam turbine pressure reducing and steam supplementation device of the present invention;

[0034] Figure 3 It is a cross-sectional view of a serpentine air supply pipe and a serpentine cooling pipe in a steam turbine pressure reducing and steam supply device of the present invention;

[0035] Figure 4 It is a schematic diagram of the external structure of a cooling box in a steam turbine pressure reducing and steam supplementation device of the present invention;

[0036] Figure 5 It is a schematic diagram of the internal structure of a cooling box in a steam turbine pressure reducing and steam supplementation device of the present invention;

[0037] Figure 6 The figure is a schematic diagram of the internal structure of a heat dissipation box in a steam turbine pressure reducing and steam supplementation device according to the present invention.

[0038] Reference numerals:

[0039] 1. Medium-pressure boiler; 2. Steam turbine body; 3. Water cooling box; 4. Serpentine air supply pipe; 5. Cooling box; 51. Radiator box; 52. Air inlet window; 53. Air outlet window; 54. Filter; 6. Solenoid valve; 7. Serpentine cooling pipe; 71. Water inlet branch pipe; 72. Water outlet branch pipe; 8. Control panel; 9. Water pump; 10. Hose; 11. Atomizing nozzle; 12. Radiating fins; 13. Radiating fan. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The present invention provides the following embodiments

[0043] See also Figure 1-6 As shown, the present invention provides a technical solution:

[0044] Embodiment 1: A steam turbine decompression and steam supplement device comprises a medium-pressure boiler 1, a turbine body 2 and a water cooling box 3, wherein a serpentine air supplement pipe 4 is fixedly connected to the interior of the water cooling box 3, one end of the serpentine air supplement pipe 4 extends to the outside of the serpentine air supplement pipe 4 and is fixedly connected to the gas outlet end of the medium-pressure boiler 1, and a solenoid valve 6 is fixedly sleeved on the serpentine air supplement pipe 4 between the medium-pressure boiler 1 and the water cooling box 3, through which the amount of steam entering the turbine body 2 can be adjusted, the other end of the serpentine air supplement pipe 4 extends to the outside of the serpentine air supplement pipe 4 and is fixedly connected to the gas inlet end of the turbine body 2, and the water cooling box 3 is fixedly sleeved on the serpentine air supplement pipe 4 between the medium-pressure boiler 1 and the water cooling box 3, and the amount of steam entering the turbine body 2 can be adjusted through the solenoid valve 6, and the other end of the serpentine air supplement pipe 4 extends to the outside of the serpentine air supplement pipe 4 and is fixedly connected to the gas inlet end of the turbine body 2, and the water cooling box 3 is fixedly sleeved on the serpentine air supplement pipe 4 between the medium-pressure boiler 1 and the water cooling box 3. A control panel 8 is fixedly installed on the front side of the box 3, and the control panel 8 is electrically connected to the external power supply through a wire. A serpentine cooling tube 7 is arranged on the outer surface of the serpentine air supply pipe 4 inside the water-cooled box 3. A water outlet branch pipe 72 is fixedly arranged on the part of the serpentine cooling tube 7 near the air inlet end of the serpentine air supply pipe 4, and a water inlet branch pipe 71 is fixedly arranged on the part of the serpentine cooling tube 7 near the air outlet end of the serpentine air supply pipe 4. The cooling water entering the serpentine cooling tube 7 through the water inlet branch pipe 71 can flow in the opposite direction to the steam inside the serpentine air supply pipe 4, and cool down the steam in the serpentine air supply pipe 4. Thus, the steam entering the steam turbine body 2 can be decompressed, and the circulating cooling water can effectively cool the steam inside the serpentine air supply pipe 4. The lower ends of the water inlet branch pipe 71 and the water outlet branch pipe 72 extend to the inside of the cooling box 5. The lower end of the water inlet branch pipe 71 is connected to the bottom of the inner side of the cooling box 5, and the lower end of the water outlet branch pipe 72 is fixedly connected to the water inlet end of the water pump 9 fixedly installed on the top of the inner side of the cooling box 5. The solenoid valve 6 and the water pump 9 are electrically connected to the control panel 8 through wires respectively. Steam is provided by the medium-pressure boiler 1, and the steam enters the serpentine air supply pipe 4. The steam in the serpentine air supply pipe 4 enters the steam turbine body 2. When the steam in the serpentine air supply pipe 4 passes through the water cooling box 3, the control panel 8 drives the water pump 9 to rotate, so that the cooling water in the cooling box 5 can be transported to the serpentine cooling pipe 7 through the water inlet branch pipe 71, and flows in the opposite direction to the steam in the serpentine air supply pipe 4, so as to effectively cool the steam in the serpentine air supply pipe 4, thereby reducing the pressure of the steam entering the steam turbine body 2. The cooling water after heat exchange with the steam can flow back to the cooling box 5 through the water outlet branch pipe 72 for cooling.

[0045] Embodiment 2: The difference between this embodiment and embodiment 1 lies in that, an atomizing nozzle 11 is fixedly connected at the center position of the top of the inner side of the cooling box 5, the water outlet end of the water pump 9 is connected with the atomizing nozzle 11 through a hose 10, and heat dissipation fins 12 are fixed side by side inside the cooling box 5, and the heat dissipation fins 12 are located below the atomizing nozzle 11. The cooling water atomized and sprayed by the atomizing nozzle 11 can exchange heat with the cold heat dissipation fins 12, which can further accelerate the cooling of the cooling water. The liquid level of the cooling water inside the cooling box 5 is located below the heat dissipation fins 12, and heat dissipation boxes 51 are symmetrically arranged on the front and rear sides of the cooling box 5. The front and rear ends of the heat dissipation fins 12 extend to the heat dissipation boxes 51 on the front and rear sides respectively, and a heat dissipation fan 13 is fixedly installed in the heat dissipation box 51 below the heat dissipation fins 12. The heat dissipation fan 13 can drive the air inside the heat dissipation box 51 to flow quickly, thereby accelerating the heat dissipation. The heat on the surface of the fin 12 is brought out, and the heat dissipation fin 12 is dissipated, so that the heat dissipation fin 12 can always maintain a low temperature. The heat dissipation fan 13 is electrically connected to the control panel 8 through a wire. An air inlet window 52 is provided at the bottom of the heat dissipation box 51, and an air outlet window 53 is provided at the bottom of the heat dissipation box 51. The air inlet window 52 and the air outlet window 53 are fixedly provided with a filter screen 54. The cooling water returning from the water outlet branch pipe 72 can be atomized and sprayed out through the atomizing nozzle 11, and then contact with the cold heat dissipation fin 12, and efficiently exchange heat with the heat dissipation fin 12, so that the cooling water is cooled more quickly. At the same time, the control panel 8 can drive the heat dissipation fan 13 to rotate. The rotation of the heat dissipation fan 13 can accelerate the air flow inside the heat dissipation box 51, so that the heat on the surface of the heat dissipation fin 12 can be quickly brought out, so that the heat dissipation fin 12 maintains a low temperature, thereby better ensuring the efficient cooling of the cooling water.

[0046] Working principle: When in use, steam is provided through the medium-pressure boiler 1, and the steam enters the serpentine air supply pipe 4, and then enters the steam turbine body 2 through the serpentine air supply pipe 4. When the steam in the serpentine air supply pipe 4 passes through the water cooling box 3, the control panel 8 drives the water pump 9 to rotate, which can transport the cooling water in the cooling box 5 to the serpentine cooling pipe 7 through the water inlet branch pipe 71, and flow in the opposite direction to the steam in the serpentine air supply pipe 4, effectively cooling the steam in the serpentine air supply pipe 4, thereby reducing the pressure of the steam entering the steam turbine body 2. The cooling water after heat exchange with the steam can The cooling water flows back to the cooling box 5 through the water outlet branch pipe 72 for cooling. The cooling water flowing back from the water outlet branch pipe 72 can be sprayed out by the atomizing nozzle 11, contact with the cold heat sink fins 12, and efficiently exchange heat with the heat sink fins 12, so that the cooling water can be cooled more quickly. At the same time, the control panel 8 can drive the cooling fan 13 to rotate. The rotation of the cooling fan 13 can speed up the air flow inside the heat sink 51, so that the heat on the surface of the heat sink fins 12 can be quickly taken out, so that the heat sink fins 12 maintain a low temperature, thereby better ensuring the efficient cooling of the cooling water.

[0047] Embodiment 3: Based on Embodiment 1 and Embodiment 2, further comprising:

[0048] Temperature measurement module 1, used to measure the temperature value at the water inlet branch pipe 71;

[0049] Temperature measurement module 2, used to measure the temperature value at the water inlet of the serpentine cooling pipe 7;

[0050] Temperature measurement module three, used to measure the temperature value at the water outlet of the serpentine cooling pipe 7;

[0051] A flow rate detection module, used to detect the real-time flow rate of cooling water in the serpentine cooling pipe 7;

[0052] An alarm module, used for issuing an alarm;

[0053] A calculation module 1, for calculating the heat absorbed by the cooling water based on the temperature value at the water outlet branch pipe 72;

[0054] Calculation module 2, used for calculating the rated flow rate of cooling water based on calculation module 1;

[0055] A processing module, used for comparing the result obtained by the calculation module 2 with the real-time flow rate of the cooling water;

[0056] The control module, when the real-time flow rate of the cooling water is greater than or equal to the rated flow rate of the cooling water, the device works normally, and when the real-time flow rate of the cooling water is greater than or equal to the rated flow rate of the cooling water, the control alarm module sounds an alarm.

[0057] The working principle and beneficial effects of the above technical scheme are as follows: temperature measurement module 1 measures the temperature value at the water inlet branch 71, temperature measurement module 2 measures the temperature value at the water inlet of the serpentine cooling tube 7, temperature measurement module 3 measures the temperature value at the water outlet of the serpentine cooling tube 7, flow rate detection module detects the real-time flow rate of cooling water, the alarm module is used to issue an alarm, calculation module 1 calculates the heat absorbed by the cooling water based on the temperature value at the water outlet branch 72, calculation module 2 calculates the rated flow rate of cooling water based on calculation module 1, and the processing module compares the result obtained by calculation module 2 with the real-time flow rate of cooling water. When the real-time flow rate of cooling water is greater than or equal to the rated flow rate of cooling water, the device works normally. When the real-time flow rate of cooling water is greater than or equal to the rated flow rate of cooling water, the control module controls the alarm module to issue an alarm to remind the staff to inspect and repair the device.

[0058] Embodiment 4: Based on Embodiment 3, the calculation module 1 calculates based on the following formula 1:

[0059]

[0060] Q is the heat absorbed by the cooling water, π is the pi, d1 is the radius of the outer surface of the serpentine air supply pipe 4, l1 is the length of the outer surface of the serpentine air supply pipe 4, T2 is the preset temperature value at the outlet branch pipe 72, T1 is the temperature value at the inlet branch pipe 71 detected by the temperature measurement module 1, h1 is the heat transfer coefficient of the cooling water, f is the friction factor between the cooling water and the outer surface of the serpentine air supply pipe 4, Re c is the Reynolds number of the serpentine cooling tube 7, Pr c is the Prandtl number of cooling water, γ1 is the thermal conductivity of cooling water, Pr d is the Prandtl number of the serpentine cooling tube 7, l2 is the length of the inner surface of the serpentine air supply tube 4, ε is the thickness of the serpentine cooling tube 7, and γ2 is the thermal conductivity of the serpentine cooling tube 7;

[0061] The calculation module 2 is calculated based on the following formula 2:

[0062]

[0063] V is the rated flow rate of cooling water, C is the specific heat capacity of cooling water, T3 is the temperature value at the water inlet of serpentine cooling pipe 7, T4 is the temperature value at the water outlet of serpentine cooling pipe 7, and d2 is the inner radius of serpentine cooling pipe 7.

[0064] The working principle and beneficial effects of the above technical solution are: The overall heat transfer coefficient is calculated by Calculate the heat absorbed by the cooling water by The rated flow rate of cooling water is calculated. When the real-time flow rate of cooling water is greater than or equal to the rated flow rate of cooling water, the device works normally. When the real-time flow rate of cooling water is greater than or equal to the rated flow rate of cooling water, the control module controls the alarm module to sound an alarm.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam turbine decompression and steam supplementation device, comprising a medium-pressure boiler (1), a turbine body (2) and a water cooling box (3), characterized in that: The interior of the water cooling box (3) is fixedly connected with a serpentine air supply pipe (4), one end of the serpentine air supply pipe (4) extends to the outside of the serpentine air supply pipe (4) and is fixedly connected to the air outlet end of the medium-pressure boiler (1), and the other end of the serpentine air supply pipe (4) extends to the outside of the serpentine air supply pipe (4) and is fixedly connected to the air inlet end of the steam turbine body (2). A control panel (8) is fixedly installed on the front side of the water cooling box (3), and a serpentine cooling pipe (7) is arranged on the outer sleeve of the serpentine air supply pipe (4) inside the water cooling box (3). The serpentine cooling pipe ( A water outlet branch pipe (72) is fixedly provided on the portion of the serpentine air supply pipe (4) near the air inlet end, and a water inlet branch pipe (71) is fixedly provided on the portion of the serpentine cooling pipe (7) near the air outlet end of the serpentine air supply pipe (4). The lower ends of the water inlet branch pipe (71) and the water outlet branch pipe (72) extend into the interior of the cooling box (5). The lower end of the water inlet branch pipe (71) is connected to the bottom of the inner side of the cooling box (5), and the lower end of the water outlet branch pipe (72) is fixedly connected to the water inlet end of a water pump (9) fixedly installed on the top of the inner side of the cooling box (5).

2. A steam turbine pressure reducing and steam supplementation device according to claim 1, characterized in that: An atomizing nozzle (11) is fixedly connected at the center position of the inner top of the cooling box (5), and the water outlet end of the water pump (9) is connected to the atomizing nozzle (11) through a hose (10).

3. A steam turbine pressure reducing and steam supplementation device according to claim 2, characterized in that: Heat dissipation fins (12) are fixed side by side inside the cooling box (5); the heat dissipation fins (12) are located below the atomizing nozzle (11); and the liquid level of cooling water inside the cooling box (5) is located below the heat dissipation fins (12).

4. A steam turbine pressure reducing and steam supplementation device according to claim 3, characterized in that: Heat dissipation boxes (51) are symmetrically arranged on the front and rear sides of the cooling box (5), and the front and rear ends of the heat dissipation fins (12) extend into the heat dissipation boxes (51) on the front and rear sides respectively.

5. A steam turbine pressure reducing and steam supplementation device according to claim 4, characterized in that: A cooling fan (13) is fixedly installed in the heat dissipation box (51) below the heat dissipation fins (12), and the cooling fan (13) is electrically connected to the control panel (8) via a wire.

6. A steam turbine pressure reducing and steam supplementation device according to claim 5, characterized in that: The bottom of the heat dissipation box (51) is provided with an air inlet window (52), the bottom of the heat dissipation box (51) is provided with an air outlet window (53), and a filter screen (54) is fixedly provided on both the air inlet window (52) and the air outlet window (53).

7. The steam turbine pressure reducing and steam supplementation device according to claim 1, characterized in that: A solenoid valve (6) is sleeved and fixed on the serpentine air supply pipe (4) between the medium-pressure boiler (1) and the water cooling box (3).

8. The steam turbine pressure reducing and steam supplementation device according to claim 7, characterized in that: The control panel (8) is electrically connected to an external power source via a wire, and the solenoid valve (6) and the water pump (9) are electrically connected to the control panel (8) via a wire, respectively.

9. The steam turbine pressure reducing and steam supplementation device according to claim 8, characterized in that: Also includes: Temperature measurement module 1, used to measure the temperature value at the water inlet branch pipe (71); Temperature measurement module 2, used for measuring the temperature value at the water inlet of the serpentine cooling pipe (7); Temperature measurement module three, used to measure the temperature value at the water outlet of the serpentine cooling pipe (7); A flow rate detection module, used for detecting the real-time flow rate of cooling water in the serpentine cooling pipe (7); An alarm module, used for issuing an alarm; A calculation module 1, used for calculating the heat absorbed by the cooling water based on the temperature value at the water outlet branch pipe (72); Calculation module 2, used for calculating the rated flow rate of cooling water based on calculation module 1; A processing module, used for comparing the result obtained by the calculation module 2 with the real-time flow rate of the cooling water; The control module, when the real-time flow rate of cooling water is greater than or equal to the rated flow rate of cooling water, the device works normally, and when the real-time flow rate of cooling water is less than the rated flow rate of cooling water, the control alarm module sounds an alarm.

10. The steam turbine pressure reducing and steam supplementation device according to claim 9, characterized in that: The calculation module 1 calculates based on the following formula 1: Q is the heat absorbed by the cooling water, π is the pi, d1 is the radius of the outer surface of the serpentine air supply pipe (4), l1 is the length of the outer surface of the serpentine air supply pipe (4), T2 is the preset temperature value at the outlet branch pipe (72), T1 is the temperature value at the inlet branch pipe (71) detected by the temperature measurement module 1, h1 is the heat transfer coefficient of the cooling water, f is the friction factor between the cooling water and the outer surface of the serpentine air supply pipe (4), Re c is the Reynolds number of the serpentine cooling tube (7), Pr c is the Prandtl number of cooling water, γ1 is the thermal conductivity of cooling water, Pr d is the Prandtl number of the serpentine cooling tube (7), l2 is the length of the inner surface of the serpentine air supply tube (4), ε is the thickness of the serpentine cooling tube (7), and γ2 is the thermal conductivity of the serpentine cooling tube (7); The calculation module 2 is calculated based on the following formula 2: V is the rated flow rate of cooling water, C is the specific heat capacity of cooling water, T3 is the temperature value at the water inlet of the serpentine cooling pipe (7), T4 is the temperature value at the water outlet of the serpentine cooling pipe (7), and d2 is the inner radius of the serpentine cooling pipe (7).

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