Circulating water heat dissipation equipment for steam turbine of thermal power plant

Abstract

The invention provides thermal power plant steam turbine circulating water heat dissipation equipment, and relates to the technical field of steam turbine circulating water heat dissipation, the thermal power plant steam turbine circulating water heat dissipation equipment comprises a box body, a continuous elbow is arranged in the box body, an auxiliary assembly is arranged on the outer wall of one side of the top of the box body, and the auxiliary assembly comprises a tank body, a water injection pipe is inserted in the center of the top end of the tank body, and a mounting seat is arranged at the bottom end of the tank body; a mounting groove is formed in the bottom end of the mounting seat and connected with the continuous bent pipe, a perforated plate is mounted in the tank body, a sliding rod is slidably connected in the perforated plate, a piston is mounted at the bottom end of the sliding rod through a bolt and located in the mounting groove, and a spring is mounted between the piston and the perforated plate through a bolt. After the negative pressure in the pipeline reaches a certain degree, the piston is pulled out of the mounting groove due to large suction force, then water and air in the tank body can flow into the continuous bent pipe through the mounting base, and therefore water and air supplementing treatment is conducted on the continuous bent pipe, the negative pressure in the pipeline is eliminated, and the problem that the pipeline is broken due to the negative pressure is solved.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine circulating water heat dissipation, and in particular to a steam turbine circulating water heat dissipation device for a thermal power plant. Background Art

[0002] A steam turbine, also known as a steam turbine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and is then sprayed onto the blades, causing the rotor with rows of blades to rotate while performing work externally. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants.

[0003] For example, a thermal power plant steam turbine circulating water heat dissipation device with application number CN202320822070.X and authorization announcement date 20230630 includes a support plate and a condensing water tank. Two V-shaped heat exchange condensing plates are installed on the upper surface of the support plate through multiple support frames. A water guide pipe is arranged between the tops of the two heat exchange condensing plates, and multiple fans with equal spacing are arranged on the surface of the support plate for blowing air and dissipating heat to the heat exchange condensing plates. The condensing water tank is located on one side of the support plate. In this thermal power plant steam turbine circulating water heat dissipation device, through the setting of the gap, the water flow entering the water guide pipe will enter the condensing cavity of the heat exchange condensing plates on both sides through the gaps on both sides, so that the hot water is dispersed, which is conducive to the cooling and heat dissipation of the water flow, and the heat dissipation is fast and effective.

[0004] When the steam turbine circulates water to dissipate heat, not only water but also water vapor flows inside the pipe. During the heat dissipation process, the water vapor inside the pipe will condense and liquefy, resulting in negative pressure inside the pipe, which is likely to cause the pipe to rupture. Therefore, it is urgent to design a steam turbine circulating water heat dissipation equipment for thermal power plants to solve the above problems. Summary of the invention

[0005] The present invention provides a circulating water heat dissipation device for a steam turbine in a thermal power plant, which is used to solve at least one of the problems raised by the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention discloses a circulating water heat dissipation device for a steam turbine in a thermal power plant, comprising a box body, a continuous bent pipe is arranged inside the box body, an auxiliary component is arranged on the outer wall of one side of the top of the box body, the auxiliary component comprises a tank body, a water injection pipe is inserted at the center of the top of the tank body, a mounting seat is arranged at the bottom end of the tank body, and a mounting groove is opened at the bottom end of the mounting seat, the mounting groove is connected with the continuous bent pipe, a porous plate is arranged inside the tank body, and a sliding rod is slidably connected inside the porous plate, a piston is installed at the bottom end of the sliding rod by bolts, the piston is located inside the mounting groove, a spring is installed between the piston and the porous plate by bolts, and the spring is sleeved on the outside of the sliding rod.

[0007] Preferably, an installation opening is provided on an outer wall on one side of the top of the box body, and the tank body is inserted into the installation opening.

[0008] Preferably, the water inlet on the outer side wall of the box body is connected to a water pipe, and the drain outlet on the outer side wall of the box body is connected to a drain pipe.

[0009] Preferably, the water outlet of the continuous curved pipe is connected to a water outlet pipe, and a plurality of fins are fixedly connected to the outside of the continuous curved pipe.

[0010] Preferably, a filter assembly is mounted on one side outer wall of the top of the box body by bolts, and the water inlet of the continuous elbow is connected to the inside of the filter assembly.

[0011] Preferably, the filter assembly comprises a mounting cylinder, a plurality of filter screens are mounted inside the mounting cylinder by bolts, a connecting pipe is connected to an outer wall on one side of the mounting cylinder, and a plurality of sewage pipes are connected to an outer wall on the other side of the mounting cylinder.

[0012] Preferably, a driving motor is installed on the top of the mounting tube by bolts, and a mounting shaft is installed on the output end of the driving motor through a coupling, a plurality of filter screens are installed on the top of the mounting tube through the lower end of the mounting shaft, and the mounting shaft is rotationally connected to the filter screens through bearings.

[0013] Preferably, a plurality of wire brushes are mounted on the outside of the mounting shaft by bolts, and the plurality of wire brushes are in contact with the tops of the plurality of filter screens in a one-to-one correspondence.

[0014] Preferably, it also includes a heat exchange performance detection device, which is used to detect the heat exchange state of the circulating water in the process of heat exchange treatment by the circulating water heat dissipation equipment of the steam turbine in the thermal power plant, and the heat exchange performance detection equipment includes:

[0015] Densitometer, used to detect the density of circulating water transported inside the connecting elbow;

[0016] A flow rate sensor is used to detect the flow rate of the circulating water transported inside the connecting elbow;

[0017] Rotational viscometer, used to detect the dynamic viscosity of the circulating water transported inside the connecting elbow;

[0018] Temperature sensor 1, used to detect the temperature of the elbow pipe wall of the steam turbine circulating water cooling equipment in the thermal power plant when cooling;

[0019] Two temperature sensors 2 are used to detect the temperature of circulating water at the inlet and outlet of the elbow when the circulating water cooling equipment of the steam turbine in the thermal power plant is cooling;

[0020] Pressure sensor 1, used to detect the pressure of circulating water inside the connecting pipe of the circulating water heat dissipation equipment of the steam turbine in the thermal power plant when dissipating heat;

[0021] Pressure sensor 2 is used to detect the pressure of circulating water inside the outlet pipe of the steam turbine circulating water heat dissipation equipment in the thermal power plant when dissipating heat;

[0022] A controller and an alarm, wherein the controller is electrically connected to a density meter, a flow rate sensor, a rotational viscometer, a temperature sensor 1, a temperature sensor 2, a pressure sensor 1, a pressure sensor 2 and an alarm, and the controller controls the operation of the alarm based on the density meter, the flow rate sensor, the rotational viscometer, the temperature sensor 1, the temperature sensor 2, the pressure sensor 1 and the pressure sensor 2.

[0023] Preferably, the controller controls the alarm to work based on the density meter, flow rate sensor and rotational viscometer, including:

[0024] Step 1: Based on formula (1) and the test values ​​obtained by the density meter, flow rate sensor and rotational viscometer, calculate the heat transfer coefficient of the water body inside the connecting pipe when the circulating water heat dissipation equipment of the thermal power plant steam turbine performs heat exchange treatment on the circulating water:

[0025]

[0026] Wherein, H is the heat transfer coefficient of the water body inside the connecting pipe when the heat dissipation equipment performs heat exchange treatment on the circulating water, k is the thermal conductivity of the circulating water inside the connecting elbow, D is the outer diameter of the connecting elbow, ρ is the detection value of the density of the circulating water inside the connecting elbow by the density meter, v is the detection value of the flow rate of the circulating water transported inside the connecting elbow by the flow rate sensor, μ is the detection value of the dynamic viscosity of the circulating water transported inside the connecting elbow by the rotational viscometer, C p is the constant-pressure specific heat of water at room temperature.

[0027] Step 2: According to the following formula (2) and formula (1), the detection values ​​obtained by temperature sensor 1, temperature sensor 2, pressure sensor 1 and pressure sensor 2, the heat exchange Q of the connecting elbow during the heat exchange treatment of the circulating water by the circulating water cooling device is calculated. The controller compares the heat exchange Q of the connecting elbow during the heat exchange treatment of the circulating water by the current circulating water cooling device with the preset heat exchange range of the connecting elbow. If the heat exchange Q of the connecting elbow during the heat exchange treatment of the circulating water by the current circulating water cooling device is not within the preset heat exchange range of the connecting elbow, the controller controls the alarm to sound an alarm:

[0028]

[0029] Among them, Q is the heat transfer capacity of the connecting elbow during the heat exchange treatment of circulating water by the circulating water cooling equipment, R is the inner diameter of the connecting elbow, L is the actual length of the connecting elbow, T wis the detection value of the wall temperature of the elbow connected to a pair of circulating water cooling devices by the temperature sensor when the cooling is performed, T0 is the detection value of the circulating water temperature at the water inlet of the elbow connected to a pair of circulating water cooling devices by the temperature sensor when the cooling is performed, T1 is the detection value of the circulating water temperature at the water outlet of the elbow connected to a pair of circulating water cooling devices by the temperature sensor when the cooling is performed, P1 is the detection value of the circulating water pressure inside the connecting pipe when the cooling is performed, and P2 is the detection value of the circulating water pressure inside the outlet pipe when the cooling is performed.

[0030] The invention provides a thermal power plant steam turbine circulating water heat dissipation device. Compared with the prior art, the invention has the following beneficial effects:

[0031] 1. Through the auxiliary components set up, when the negative pressure inside the pipeline reaches a certain level, the piston will be subjected to a large suction force, causing the piston to be pulled out of the installation groove. Then the water and air inside the tank will flow into the continuous elbow through the mounting seat, thereby replenishing water and air for the continuous elbow, eliminating the negative pressure inside the pipeline, and avoiding the problem of pipeline rupture due to negative pressure.

[0032] 2. Through the filter assembly set up, when the turbine circulating water enters the device, the circulating water will first enter the filter assembly, and the multiple filters inside the installation cylinder can filter the circulating water, thereby filtering out impurities in the circulating water, and the subsequent drive motor will start at a fixed time, so that the installation shaft rotates with the wire brush, so that the wire brush cleans the upper surface of the filter, so that the impurities on the surface of the filter float up, and the drain pipe can be opened subsequently, so that the impurities at the filter are discharged together with the water, to achieve the cleaning of the filter, to avoid affecting the filter effect of the filter by clogging the filter.

[0033] 3. Through the fins, when the circulating water is cooled, the design of the fins can increase the heat exchange area between the continuous elbow and the water inside the box, so that the heat exchange rate between the circulating water inside the continuous elbow and the water is improved, thereby improving the heat dissipation effect of the circulating water. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 A schematic diagram of the structure of a steam turbine circulating water heat dissipation device for a thermal power plant provided by an embodiment of the present invention;

[0036] Figure 2A schematic diagram of a box structure of a steam turbine circulating water heat dissipation device for a thermal power plant provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the internal structure of a casing of a steam turbine circulating water heat dissipation device for a thermal power plant provided by an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the structure of a filter assembly for a steam turbine circulating water heat dissipation device in a thermal power plant provided by an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the structure of an auxiliary component of a steam turbine circulating water heat dissipation device for a thermal power plant provided by an embodiment of the present invention;

[0040] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the box at A in the middle.

[0041] Reference numerals:

[0042] 1. Box body; 2. Filter assembly; 3. Auxiliary assembly; 4. Water outlet pipe; 5. Water delivery pipe; 6. Drain pipe; 7. Continuous elbow pipe; 8. Installation port; 9. Fins; 10. Tank body; 11. Water injection pipe; 12. Mounting seat; 13. Mounting groove; 14. Perforated plate; 15. Sliding rod; 16. Spring; 17. Piston; 18. Mounting cylinder; 19. Driving motor; 20. Mounting shaft; 21. Filter screen; 22. Wire brush; 23. Connecting pipe; 24. Drain pipe. DETAILED DESCRIPTION

[0043] 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.

[0044] The present invention provides the following embodiments

[0045] Example 1

[0046] The embodiment of the present invention provides a circulating water heat dissipation device for steam turbines in thermal power plants, such as Figure 1-Figure 6As shown, it includes a box body 1, a continuous curved pipe 7 is provided inside the box body 1, an auxiliary component 3 is provided on the outer wall of one side of the top of the box body 1, and the auxiliary component 3 includes a tank body 10, a water injection pipe 11 is inserted at the center of the top of the tank body 10, a mounting seat 12 is provided at the bottom end of the tank body 10, and a mounting groove 13 is opened at the bottom end of the mounting seat 12, and the mounting groove 13 is communicated with the continuous curved pipe 7, a porous plate 14 is installed inside the tank body 10 by bolts, and a sliding rod 15 is slidably connected inside the porous plate 14, a piston 17 is installed at the bottom end of the sliding rod 15 by bolts, and the piston 17 is located inside the mounting groove 13, a spring 16 is installed between the piston 17 and the porous plate 14 by bolts, and the spring 16 is sleeved on the outside of the sliding rod 15.

[0047] The working principle and beneficial effects of the above technical solution are:

[0048] The present invention discloses a circulating water heat dissipation device for steam turbines in a thermal power plant, comprising a box body 1, a continuous elbow pipe 7 is arranged inside the box body 1, an auxiliary component 3 is arranged on the outer wall of one side of the top of the box body 1, the auxiliary component 3 comprises a tank body 10, clean water is stored inside the tank body 10, and the clean water occupies half of the tank body 10, a water injection pipe 11 is inserted at the center of the top of the tank body 10, and the water injection pipe 11 is convenient for injecting clean water into the tank body 10, a mounting seat 12 is arranged at the bottom end of the tank body 10, and a mounting groove 13 is opened at the bottom end of the mounting seat 12, and the mounting groove 13 is connected with the continuous elbow pipe 7, and a porous plate 14 is installed inside the tank body 10 by bolts, and the porous plate 14 is a circular plate with a plurality of circular holes, and the porous plate 14 has a sliding The piston 17 is dynamically connected to the tank body 10 and a piston 17 is installed at the bottom of the slide rod 15 by bolts. When the negative pressure inside the pipeline reaches a certain level, the piston 17 will be subjected to a large suction force, so that the piston 17 is pulled out of the installation groove 13, and then the water and air inside the tank body 10 will flow into the continuous elbow 7 through the mounting seat 12, thereby replenishing water and air for the continuous elbow 7, eliminating the negative pressure inside the pipeline, and avoiding the pipeline from rupturing due to negative pressure. The piston 17 is located inside the installation groove 13, and a spring 16 is installed between the piston 17 and the porous plate 14 by bolts. The spring 16 will make the piston 17 stuck in the installation groove 13 when not subject to external force, and the spring 16 is sleeved on the outside of the slide rod 15.

[0049] Secondly, when the negative pressure inside the pipeline reaches a certain level, the piston 17 will be subjected to a large suction force, causing the piston 17 to be pulled out of the mounting groove 13, and then the water and air inside the tank body 10 will flow into the continuous bend pipe 7 through the mounting seat 12, thereby replenishing water and air for the continuous bend pipe 7, eliminating the negative pressure inside the pipeline, and avoiding the pipeline from rupturing due to negative pressure.

[0050] The above-mentioned thermal power plant steam turbine circulating water heat dissipation equipment is provided with an auxiliary component 3. When the negative pressure inside the pipeline reaches a certain level, the piston 17 will be subjected to a large suction force, so that the piston 17 is pulled out of the installation groove 13, and then the water and air inside the tank body 10 will flow into the continuous bend pipe 7 through the mounting seat 12, thereby replenishing water and air for the continuous bend pipe 7, eliminating the negative pressure inside the pipeline, and avoiding the problem of pipeline rupture due to negative pressure.

[0051] Example 2

[0052] On the basis of Example 1, Figure 2-Figure 6 As shown, a mounting opening 8 is provided on the outer wall of one side of the top of the box body 1 , and the tank body 10 is inserted into the mounting opening 8 .

[0053] Preferably, the water inlet on the outer wall of the box body 1 is connected to a water pipe 5 , and the drain outlet on the outer wall of the box body 1 is connected to a drain pipe 6 .

[0054] Preferably, the water outlet of the continuous curved pipe 7 is connected to the water outlet pipe 4 , and a plurality of fins 9 are fixedly connected to the outside of the continuous curved pipe 7 .

[0055] Preferably, a filter assembly 2 is mounted on one side outer wall of the top of the box body 1 by bolts, and the water inlet of the continuous elbow 7 is connected to the inside of the filter assembly 2.

[0056] Preferably, the filter assembly 2 includes a mounting cylinder 18 , in which a plurality of filter screens 21 are installed by bolts, a connecting pipe 23 is connected to an outer wall on one side of the mounting cylinder 18 , and a plurality of sewage pipes 24 are connected to an outer wall on the other side of the mounting cylinder 18 .

[0057] Preferably, a driving motor 19 is installed at the top of the mounting cylinder 18 by bolts, and a mounting shaft 20 is installed at the output end of the driving motor 19 through a coupling, and a plurality of filter screens 21 are installed at the top of the mounting cylinder 18 through a rotational connection of the lower end of the mounting shaft 20, and the mounting shaft 20 is rotationally connected to the filter screens 21 through bearings.

[0058] Preferably, a plurality of wire brushes 22 are mounted on the outside of the mounting shaft 20 by means of bolts, and the plurality of wire brushes 22 are in contact with the tops of the plurality of filter screens 21 in a one-to-one correspondence.

[0059] The working principle and beneficial effects of the above technical solution are:

[0060] In the above-mentioned heat dissipation device for circulating water of steam turbine in a thermal power plant, an installation port 8 is opened on the outer wall of one side of the top of the box body 1, and the tank body 10 is plugged into the installation port 8. A water delivery pipe 5 is plugged into the outer wall of one side of the box body 1, and a drainage pipe 6 is plugged into the outer wall of one side of the box body 1. When heat is dissipated, the external water pump will circulate the cooling water into the box body 1 through the water delivery pipe 5 and the drainage pipe 24, so as to dissipate heat for the circulating water inside the continuous bend pipe 7. A water outlet pipe 4 is welded at one end of the continuous bend pipe 7, and a plurality of fins are welded on the outside of the continuous bend pipe 7. The design of the fins 9 can increase the heat exchange area between the continuous elbow 7 and the water inside the box 1, so that the heat exchange rate between the circulating water inside the continuous elbow 7 and the water is improved, thereby improving the heat dissipation effect of the circulating water; a filter assembly 2 is installed on the outer wall of one side of the top of the box 1 by bolts, one end of the continuous elbow 7 is plugged into the inside of the filter assembly 2, and the filter assembly 2 includes a mounting cylinder 18, a plurality of filter screens 21 are installed inside the mounting cylinder 18 by bolts, a connecting pipe 23 is plugged into the outer wall of one side of the mounting cylinder 18, and the mounting cylinder 18 is connected to the outer wall of the mounting cylinder 18. A plurality of sewage pipes 24 are plugged into the side outer wall, and a solenoid valve is installed on the sewage pipe 24. When the drive motor 19 is started, the solenoid valve will start accordingly to discharge the sewage inside the installation cylinder 18. The drive motor 19 is installed on the top of the installation cylinder 18 through bolts. The model of the drive motor 19 is preferably 57BYGH650-23, and the output end of the drive motor 19 is installed with a mounting shaft 20 through a coupling. The mounting shaft 20 passes through the filter screen 21, and the mounting shaft 20 is rotatably connected to the filter screen 21 through a bearing. A plurality of wire brushes 22 are installed on the outside of the shaft 20 by bolts. The driving motor 19 is started at a fixed time, which will cause the installation shaft 20 to rotate with the wire brush 22, so that the wire brush 22 cleans the upper surface of the filter 21, causing impurities on the upper surface of the filter 21 to float up, and the drain pipe 24 can be opened subsequently to discharge impurities on the filter 21 along with the water, thereby cleaning the filter 21 and avoiding clogging of the filter 21 and affecting the filtering effect of the filter 21, and the wire brush 22 is in contact with the filter 21.

[0061] When the above-mentioned thermal power plant steam turbine circulating water heat dissipation equipment is performing heat dissipation work, the external water pump will circulate the cooling water into the box body 1 through the water delivery pipe 5 and the sewage pipe 24, and the circulating water will flow into the installation tube 18 through the connecting pipe 23, and then the filter 21 inside the installation tube 18 will filter the circulating water to prevent impurities from flowing into the continuous elbow 7 with the circulating water. When the subsequent circulating water flows into the continuous elbow 7, the design of the fins 9 can increase the heat exchange area between the continuous elbow 7 and the water inside the box body 1, so that the heat exchange rate between the circulating water and the water inside the continuous elbow 7 is improved, thereby improving the heat dissipation effect of the circulating water. The circulating water that has been cooled will flow back to the steam turbine through the outlet pipe 4, and in the heat dissipation process, when the negative pressure inside the pipeline reaches After reaching a certain level, the piston 17 will be subjected to a greater suction force, causing the piston 17 to be pulled out of the mounting groove 13, and then the water and air inside the tank body 10 will flow into the continuous elbow 7 through the mounting seat 12, thereby replenishing water and air for the continuous elbow 7, eliminating the negative pressure inside the pipeline, and avoiding the pipeline from rupturing due to negative pressure. In addition, during the heat dissipation process, the drive motor 19 will start at a fixed time, so that the mounting shaft 20 rotates with the wire brush 22, so that the wire brush 22 cleans the upper surface of the filter 21, so that impurities on the upper surface of the filter 21 float up, and the drain pipe 24 can be opened later to discharge impurities at the filter 21 along with the water, so as to achieve the cleaning of the filter 21 and avoid affecting the clogging of the filter 21 and affecting the filtering effect of the filter 21.

[0062] The above-mentioned thermal power plant steam turbine circulating water heat dissipation device is provided with a filter assembly 2. When the steam turbine circulating water enters the device, the circulating water will first enter the filter assembly 2. The multiple filter screens 21 inside the mounting cylinder 18 can filter the circulating water, thereby filtering out impurities in the circulating water, and the subsequent drive motor 19 will be started at a fixed time, so that the mounting shaft 20 rotates with the wire brush 22, so that the wire brush 22 cleans the upper surface of the filter screen 21, so that the impurities on the upper surface of the filter screen 21 float up, and the sewage pipe 24 can be opened subsequently, so that the impurities at the filter screen 21 are discharged together with the water, so as to realize the cleaning of the filter screen 21 and avoid affecting the clogging of the filter screen 21 and affecting the filtering effect of the filter screen 21; secondly, through the provided fins 9, when the circulating water is cooled and cooled, the design of the fins 9 can increase the heat exchange area between the continuous elbow 7 and the water inside the box 1, so that the heat exchange rate between the circulating water inside the continuous elbow 7 and the water is improved, thereby improving the heat dissipation effect of the circulating water.

[0063] Example 3

[0064] A thermal power plant steam turbine circulating water heat dissipation device described on the basis of embodiment 1 or 2 further includes a heat exchange performance detection device, which is used for detecting the heat exchange state of the circulating water in the thermal power plant steam turbine circulating water heat dissipation device during the heat exchange treatment process. The heat exchange performance detection device includes:

[0065] Densitometer, used to detect the density of circulating water transported inside the connecting elbow 7;

[0066] A flow rate sensor, used to detect the flow rate of the circulating water transported inside the connecting elbow 7;

[0067] A rotational viscometer, used to detect the dynamic viscosity of the circulating water transported inside the connecting elbow 7;

[0068] Temperature sensor 1, used to detect the temperature of the pipe wall of the connecting elbow 7 of the steam turbine circulating water heat dissipation equipment in the thermal power plant when dissipating heat;

[0069] Two temperature sensors 2 are used to detect the temperature of circulating water at the inlet and outlet of the connecting elbow 7 when the circulating water heat dissipation equipment of the steam turbine in the thermal power plant is dissipating heat;

[0070] Pressure sensor 1, used to detect the pressure of circulating water inside the connecting pipe 23 of the steam turbine circulating water heat dissipation equipment of the thermal power plant when heat is being dissipated;

[0071] Pressure sensor 2, used to detect the pressure of circulating water inside the outlet pipe 4 of the steam turbine circulating water heat dissipation equipment of the thermal power plant when heat is being dissipated;

[0072] A controller and an alarm, wherein the controller is electrically connected to a density meter, a flow rate sensor, a rotational viscometer, a temperature sensor 1, a temperature sensor 2, a pressure sensor 1, a pressure sensor 2 and an alarm, and the controller controls the operation of the alarm based on the density meter, the flow rate sensor, the rotational viscometer, the temperature sensor 1, the temperature sensor 2, the pressure sensor 1 and the pressure sensor 2.

[0073] Preferably, the controller controls the alarm to work based on the density meter, flow rate sensor and rotational viscometer, including:

[0074] Step 1: Based on formula (1) and the test values ​​obtained by the density meter, flow rate sensor and rotational viscometer, calculate the heat transfer coefficient of the water body inside the connecting pipe when the circulating water heat dissipation equipment of the thermal power plant steam turbine performs heat exchange treatment on the circulating water:

[0075]

[0076] Wherein, H is the heat transfer coefficient of the water body inside the connecting pipe 7 when the heat dissipation device performs heat exchange treatment on the circulating water, k is the thermal conductivity of the circulating water inside the connecting elbow 7 (which can be obtained by looking up the table according to the actual temperature of the circulating water), D is the outer diameter of the connecting elbow 7, ρ is the detection value of the density of the circulating water inside the connecting elbow 7 by the densitometer, v is the detection value of the flow rate of the circulating water transported inside the connecting elbow 7 by the flow rate sensor, μ is the detection value of the dynamic viscosity of the circulating water transported inside the connecting elbow 7 by the rotational viscometer, C p It is the constant-pressure specific heat capacity of water at room temperature (the value is 4.184 kJ / kg·K).

[0077] Step 2: According to the following formula (2) and formula (1), the detection values ​​obtained by temperature sensor 1, temperature sensor 2, pressure sensor 1 and pressure sensor 2, the heat exchange Q of the connecting elbow 7 during the heat exchange treatment of the circulating water by the circulating water heat dissipation device is calculated. The controller compares the heat exchange Q of the connecting elbow 7 during the heat exchange treatment of the circulating water by the current circulating water heat dissipation device with the preset heat exchange range of the connecting elbow 7. If the heat exchange Q of the connecting elbow 7 during the heat exchange treatment of the circulating water by the current circulating water heat dissipation device is not within the preset heat exchange range of the connecting elbow 7, the controller controls the alarm to sound an alarm:

[0078]

[0079] Wherein, Q is the heat exchange capacity of the connecting elbow 7 during the heat exchange treatment of the circulating water heat dissipation equipment on the circulating water, R is the inner diameter of the connecting elbow 7, L is the actual length of the connecting elbow 7, T w is the detection value of the wall temperature of the elbow 7 connected to the circulating water heat dissipation device by a pair of temperature sensors when the circulating water heat dissipation device is dissipating heat, T0 is the detection value of the circulating water temperature at the water inlet of the elbow 7 connected to the circulating water heat dissipation device by a pair of temperature sensors when the circulating water heat dissipation device is dissipating heat, T1 is the detection value of the circulating water temperature at the water outlet of the elbow 7 connected to the circulating water heat dissipation device by a pair of temperature sensors when the circulating water heat dissipation device is dissipating heat, P1 is the detection value of the circulating water pressure inside the connecting pipe 23 when the circulating water heat dissipation device is dissipating heat, and P2 is the detection value of the circulating water pressure inside the outlet pipe 4 when the circulating water heat dissipation device is dissipating heat by a pair of pressure sensors.

[0080] The beneficial effects of the above technical solution are as follows: first, according to formula (1) and the detection values ​​of the density meter, the flow rate sensor and the rotational viscometer, the heat transfer coefficient of the water body inside the connecting pipe 7 when the heat dissipation device performs heat exchange treatment on the circulating water is calculated, and by comprehensively considering the thermal conductivity of the circulating water inside the connecting elbow 7, the outer diameter of the connecting elbow 7, the density of the circulating water inside the connecting elbow 7, the flow rate of the circulating water transported inside the connecting elbow 7, the dynamic viscosity of the circulating water transported inside the connecting elbow 7, and the constant-pressure specific heat capacity of the water body at room temperature, the calculation result is more accurate and reliable;

[0081] Finally, according to formula (2), and taking into account the heat transfer coefficient of the water body inside the connecting pipe 7 when the heat dissipation device performs heat exchange treatment on the circulating water, the inner diameter of the connecting elbow 7, the actual length of the connecting elbow 7, the temperature of the pipe wall of the connecting elbow 7 when the circulating water heat dissipation device performs heat dissipation, the temperature of the circulating water at the water inlet of the connecting elbow 7 when the circulating water heat dissipation device performs heat dissipation, the temperature of the circulating water at the water outlet of the connecting elbow 7 when the circulating water heat dissipation device performs heat dissipation, the pressure of the circulating water inside the connecting pipe 23 when the circulating water heat dissipation device performs heat dissipation, and the pressure of the circulating water inside the outlet pipe 4 of the circulating water heat dissipation device when the pressure sensor 2 performs heat dissipation, the heat transfer Q of the connecting elbow 7 in the process of the circulating water heat dissipation device performing heat exchange treatment on the circulating water is calculated, so that the calculation result is more accurate and reliable.

[0082] The controller controls the operation of the density meter, the flow rate sensor, the rotational viscometer, the temperature sensor 1, the temperature sensor 2, the pressure sensor 1, the pressure sensor 2 and the alarm. When the heat exchange amount Q of the connecting elbow 7 during the heat exchange treatment of the circulating water by the actual circulating water heat dissipation equipment is not within the preset heat exchange amount range of the connecting elbow 7, the controller controls the alarm to sound an alarm, thereby reminding the staff to promptly check the connecting elbow 7 in the circulating water heat dissipation equipment, and perform maintenance on the connecting elbow 7 according to the actual inspection results to maintain the use requirements of the connecting elbow 7, while ensuring the normal working state of the steam turbine circulating water heat dissipation equipment in the thermal power plant and the heat exchange efficiency of the circulating water, and effectively improving the service life of the connecting elbow 7, further meeting the use requirements of the steam turbine circulating water heat dissipation equipment in the thermal power plant for operation reliability and stability, and by real-time monitoring of the working state of the connecting elbow 7 during operation, not only the efficiency of the steam turbine circulating water heat dissipation equipment in the thermal power plant for heat exchange of the circulating water is increased, but also it is ensured that the connecting elbow 7 can be quickly discovered and replaced in time after a failure occurs.

[0083] 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 circulating water heat dissipation device for steam turbines in thermal power plants, characterized in that: The invention comprises a box body (1), wherein a continuous curved pipe (7) is arranged inside the box body (1), an auxiliary component (3) is arranged on the outer wall of one side of the top of the box body (1), and the auxiliary component (3) comprises a tank body (10), wherein a water injection pipe (11) is inserted at the center of the top of the tank body (10), a mounting seat (12) is arranged at the bottom end of the tank body (10), and a mounting groove (13) is opened at the bottom end of the mounting seat (12), and the mounting groove (13) is communicated with the continuous curved pipe (7), a porous plate (14) is arranged inside the tank body (10), and a sliding rod (15) is slidably connected inside the porous plate (14), a piston (17) is installed at the bottom end of the sliding rod (15) by bolts, and the piston (17) is located inside the mounting groove (13), and a spring (16) is installed between the piston (17) and the porous plate (14) by bolts, and the spring (16) is sleeved on the outside of the sliding rod (15).

2. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 1, characterized in that: An installation opening (8) is provided on an outer wall on one side of the top of the box body (1), and the tank body (10) is inserted into the installation opening (8).

3. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 1, characterized in that: The water inlet on the outer wall of the box body (1) is connected to a water pipe (5), and the water outlet on the outer wall of the box body (1) is connected to a water pipe (6).

4. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 1, characterized in that: The water outlet of the continuous curved pipe (7) is connected to a water outlet pipe (4), and a plurality of fins (9) are fixedly connected to the outside of the continuous curved pipe (7).

5. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 1, characterized in that: A filter assembly (2) is mounted on one side outer wall of the top of the box body (1) by means of bolts, and the water inlet of the continuous curved pipe (7) is connected to the inside of the filter assembly (2).

6. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 5, characterized in that: The filter assembly (2) comprises a mounting cylinder (18), a plurality of filter screens (21) are mounted inside the mounting cylinder (18) by means of bolts, a connecting pipe (23) is connected to an outer wall on one side of the mounting cylinder (18), and a plurality of sewage pipes (24) are connected to an outer wall on the other side of the mounting cylinder (18).

7. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 6, characterized in that: A driving motor (19) is installed at the top of the installation cylinder (18) via bolts, and a mounting shaft (20) is installed at the output end of the driving motor (19) via a coupling, and a plurality of filter screens (21) are installed at the top of the installation cylinder (18) so as to be rotatable and pass through the lower end of the installation shaft (20), and the installation shaft (20) is rotatably connected to the filter screens (21) via bearings.

8. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 7, characterized in that: A plurality of wire brushes (22) are installed on the outside of the installation shaft (20) by means of bolts, and the plurality of wire brushes (22) are in contact with the tops of the plurality of filter screens (21) in a one-to-one correspondence.

9. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 1, characterized in that: It also includes a heat exchange performance detection device, which is used to detect the heat exchange state of the circulating water in the heat exchange treatment process of the steam turbine circulating water heat dissipation equipment of the thermal power plant. The heat exchange performance detection equipment includes: A densitometer, used to detect the density of the circulating water transported inside the connecting elbow (7); A flow rate sensor, used for detecting the flow rate of circulating water transported inside the connecting elbow (7); A rotational viscometer for detecting the dynamic viscosity of the circulating water transported inside the connecting elbow (7); Temperature sensor 1, used to detect the temperature of the pipe wall of the connecting elbow (7) when the circulating water heat dissipation equipment of the steam turbine in the thermal power plant is dissipating heat; Two temperature sensors 2 are used to detect the temperature of circulating water at the inlet and outlet of the connecting elbow (7) when the circulating water heat dissipation equipment of the steam turbine in the thermal power plant is dissipating heat; Pressure sensor 1, used to detect the pressure of circulating water inside the connecting pipe (23) of the steam turbine circulating water heat dissipation equipment of the thermal power plant when heat is being dissipated; Pressure sensor 2, used to detect the pressure of circulating water inside the outlet pipe (4) of the steam turbine circulating water heat dissipation equipment of the thermal power plant when heat is being dissipated; A controller and an alarm, wherein the controller is electrically connected to a density meter, a flow rate sensor, a rotational viscometer, a temperature sensor 1, a temperature sensor 2, a pressure sensor 1, a pressure sensor 2 and an alarm, and the controller controls the operation of the alarm based on the density meter, the flow rate sensor, the rotational viscometer, the temperature sensor 1, the temperature sensor 2, the pressure sensor 1 and the pressure sensor 2.

10. The circulating water heat dissipation equipment for steam turbines in thermal power plants according to claim 9, characterized in that: The controller controls the alarm based on the density meter, the flow rate sensor and the rotational viscometer to work as follows: Step 1: Based on formula (1) and the test values ​​obtained by the density meter, flow rate sensor and rotational viscometer, calculate the heat transfer coefficient of the water body inside the connecting pipe when the circulating water heat dissipation equipment of the thermal power plant steam turbine performs heat exchange treatment on the circulating water: Wherein, H is the heat transfer coefficient of the water body inside the connecting pipe (7) when the heat dissipation device performs heat exchange treatment on the circulating water, k is the thermal conductivity of the circulating water inside the connecting elbow (7), D is the outer diameter of the connecting elbow, ρ is the detection value of the density of the circulating water inside the connecting elbow (7) by the density meter, v is the detection value of the flow rate of the circulating water transported inside the connecting elbow (7) by the flow rate sensor, μ is the detection value of the dynamic viscosity of the circulating water transported inside the connecting elbow (7) by the rotational viscometer, C p is the constant-pressure specific heat of water at room temperature. Step 2: According to the following formula (2) and formula (1), the detection values ​​obtained by temperature sensor 1, temperature sensor 2, pressure sensor 1 and pressure sensor 2, the heat exchange amount Q of the connecting elbow (7) during the heat exchange treatment of the circulating water by the circulating water heat dissipation device is calculated, and the controller compares the heat exchange amount Q of the connecting elbow (7) during the heat exchange treatment of the circulating water by the current circulating water heat dissipation device with the preset heat exchange range of the connecting elbow (7). If the heat exchange amount Q of the connecting elbow (7) during the heat exchange treatment of the circulating water by the current circulating water heat dissipation device is not within the preset heat exchange range of the connecting elbow (7), the controller controls the alarm to sound an alarm: Wherein, Q is the heat exchange amount of the connecting elbow (7) during the heat exchange treatment of the circulating water by the circulating water heat dissipation device, R is the inner diameter of the connecting elbow (7), L is the actual length of the connecting elbow (7), T w is the detection value of the wall temperature of the elbow (7) connected to the circulating water heat dissipation device by the temperature sensor when the circulating water heat dissipation device is performing heat dissipation, T0 is the detection value of the circulating water temperature at the water inlet of the elbow (7) connected to the circulating water heat dissipation device by the temperature sensor when the circulating water heat dissipation device is performing heat dissipation, T1 is the detection value of the circulating water temperature at the water outlet of the elbow (7) connected to the circulating water heat dissipation device by the temperature sensor when the circulating water heat dissipation device is performing heat dissipation, P1 is the detection value of the circulating water pressure inside the connecting pipe (23) of the circulating water heat dissipation device by the pressure sensor when the circulating water heat dissipation device is performing heat dissipation, and P2 is the detection value of the circulating water pressure inside the outlet pipe (4) of the circulating water heat dissipation device by the pressure sensor when the circulating water heat dissipation device is performing heat dissipation.

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