Steam turbine pipeline for reducing self power consumption of thermal power plant
By designing steam turbine pipelines, including pumping pipes, collection pipes, drain pipes and condensers, the problems of self-use electricity for fans and shaft seals in thermal power plants are solved, and steam recovery and efficient utilization of energy are achieved. , reducing power consumption and steam waste.
Patent Information
- Application Number
- CN202421129400.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2024-12-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The steam turbine fans in thermal power plants have high power consumption, and fan failures lead to leakage of the shaft seal, affecting working fluid and heat recovery, and serious steam waste.
A steam turbine pipeline is designed, including a pumping pipe, a collection pipe, an exhaust pipe, a steam extraction valve and a condensing engine. By extracting and recovering steam leakage from the turbine, the condensation water is heated by a shaft seal heater to reduce energy losses, and The condenser condenses steam into liquid, reducing electricity consumption and steam waste.
It effectively reduces the power consumption of self-use, prevents the shaft seal leakage caused by fan failure, improves the operating stability of the turbine, and realizes full steam recovery, reducing the impact of power and equipment failures.
Smart Images
Figure CN222184860U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of self-power equipment for thermal power plants, and in particular relates to a steam turbine pipeline for reducing the self-power consumption of thermal power plants. Background Art
[0002] In a thermal power plant, various high and low voltage electric devices play different roles. When these devices are running, they will inevitably consume a certain amount of electricity, which is called self-consumption electricity. In order to reduce the self-consumption electricity of a thermal power plant, some motors should be stopped as much as possible when conditions permit.
[0003] The two 380V electric fans of the steam turbine shaft seal heater run 24 hours a day in a one-in-one-standby mode. When the fans are running, they extract the exhaust steam and mixed air after the leakage of the shaft seal steam outer block passes through the shaft seal heater, and maintain a negative pressure of about -2KPa inside the heater, so that the leakage of the shaft seal steam outer block does not emit steam to the outside, but directly heats the condensed water in the shaft seal heater.
[0004] The following problems exist in actual use:
[0005] 1. The operation of the fan consumes about 96Kw of electricity every day;
[0006] 2. During operation, if one fan suddenly fails, the other fan cannot start normally, resulting in a large amount of steam leakage from the shaft seal;
[0007] 3. The tripping of the shaft fan is not conducive to the recovery of working fluid and heat, and pollutes the environment of the steam turbine plant;
[0008] 4. If the standby fan cannot be started quickly, the shaft seal steam will enter the bearing box, which will not only affect its temperature, but also increase the water content in the oil, thus damaging the quality of the lubricating oil;
[0009] 5. Running the fan 24 hours a day to exhaust steam causes steam waste.
[0010] Therefore, a steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant is proposed. Utility Model Content
[0011] The utility model aims to provide a steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant, which has the function of reducing the self-consumption of electricity in a thermal power plant and solves the problems of the prior art of the self-consumption of electricity by the fan and the leakage of steam due to the shaft seal of the fan failure.
[0012] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model provides a steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant, including a steam turbine, wherein exhaust pipes are arranged at the front and rear ends of the steam turbine, an exhaust nozzle is arranged at the front end of the exhaust pipe, the exhaust pipe is connected to a collecting pipe, the collecting pipe is connected to a shaft seal heater, an exhaust pipe is arranged on the shaft seal heater, an exhaust port is arranged at the end of the exhaust pipe, a shaft fan and an exhaust valve are arranged on the exhaust pipe, a connecting pipe is led out from the exhaust pipe and connected to a drain expansion tank, a stop valve, a ball valve and a needle valve are arranged on the connecting pipe, a condensing pipe is led out from the water supply expansion tank and connected to a condensing machine, and the condensing machine is connected to the steam turbine through the lead-out pipe.
[0013] Preferably, a collecting valve is provided on the collecting pipe.
[0014] Preferably, the number of the exhaust pipes is 2 and they are arranged in parallel, and the number of the exhaust ports, the axial fans and the steam extraction valves is set to 2 corresponding to the number of the exhaust pipes.
[0015] Preferably, the water expansion tank is connected to external water supply via a water pipe.
[0016] Preferably, the condenser is connected to a vacuum pump, and the vacuum pump is provided with a discharge port.
[0017] Preferably, the connecting pipe is led out on the exhaust pipe before the axial fan and the steam extraction valve.
[0018] Preferably, the condensate pipe is provided with a condensate valve, and the number of condensate pipes is 2, and the number of condensate valves corresponding to the number of condensate pipes is set to 2.
[0019] Compared with the prior art, the advantages and positive effects of the utility model are:
[0020] 1. The utility model can effectively reduce the power consumption and at the same time, recycle the discharged steam, so that the internal operation of the shaft is more stable and is not affected by the equipment failure of the power, motor and fan;
[0021] 2. The utility model has the function of reducing the self-consumption of electricity in thermal power plants, and solves the problems of self-consumption of electricity by fans in the prior art and steam leakage due to shaft seal failure of fans. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.
[0023] Figure 1It is a schematic diagram of the structure of a steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant;
[0024] In the above figure, 1. steam turbine, 2. exhaust pipe, 3. exhaust nozzle, 4. collecting pipe, 5. shaft seal heater, 6. collecting valve, 7. exhaust pipe, 8. exhaust port, 9. shaft fan, 10. extraction valve, 11. connecting pipe, 12. drain expansion tank, 13. stop valve, 14. ball valve, 15. needle valve, 16. water pipe, 17. condensing pipe, 18. condensing machine, 19. condensing valve, 20. lead-out pipe, 21. vacuum pump, 22. exhaust port. DETAILED DESCRIPTION
[0025] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.
[0027] Embodiment 1, as Figure 1 As shown, a steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant includes a steam turbine 1, which is a device for generating electricity. The steam turbine 1 is provided with an exhaust pipe 2 at both ends, and the exhaust pipe 2 is used to extract the leaked steam of the steam turbine 1 and recover the high-quality steam that originally leaked to the outside. The front end of the exhaust pipe 2 is provided with an exhaust nozzle 3, which is funnel-shaped and used to collect the leaked steam at the front and rear steam seals of the steam turbine 1.
[0028] The exhaust pipe 2 is connected to the collecting pipe 4, which collects the leaked gas collected by the exhaust pipe 2. The collecting pipe 4 is connected to the shaft seal heater 5. The shaft seal heater 5 is a device that recovers the leaked steam of the shaft seal and uses its heat to heat the condensed water, thereby reducing energy loss and improving the thermal efficiency of the unit. The shaft seal heater 5 is provided with an exhaust pipe 7, which discharges the steam inside the shaft seal heater 5. The exhaust pipe 7 is provided with an exhaust port 8 at the end of the exhaust pipe 7, which is used to discharge steam.
[0029] The exhaust pipe 7 is provided with an axial fan 9 and a steam extraction valve 10. The axial fan 9 plays an extraction role. The steam extraction valve 10 can control the opening and closing of the exhaust pipe 7. The exhaust pipe 7 leads to a connecting pipe 11 connected to a hydrophobic expansion tank 12. The water and steam inside the hydrophobic expansion tank 12 can be discharged in time through the connecting pipe 11. The connecting pipe 11 is provided with a stop valve 13, a ball valve 14 and a needle valve 15. The stop valve 13, the ball valve 14 and the needle valve 15 are all used to control the flow of the connecting pipe 11. The stop valve 13 is used as a main valve, and the ball valve 14 and the needle valve 15 are used to adjust the stability of the pressure.
[0030] A condensing pipe 17 is led out of the water supply expansion tank and connected to a condensing machine 18. The condensing machine 18 is used to condense the steam into liquid. The internal part of the hydrophobic expansion tank 12 expands and reduces the pressure. The steam and condensed water are sucked into the condensing machine 18 through the condensing pipe 17. The condensing pipe 17 and the condensing machine 18 are connected to the steam turbine 1 through the lead-out pipe 20. The lead-out pipe 20 transports the steam in the steam turbine 1 to the condensing machine 18.
[0031] The following is a detailed description of the design of the above key components:
[0032] The collecting pipe 4 is provided with a collecting valve 6. The design of the collecting valve 6 can achieve accurate control of the extracted steam by controlling the flow of the collecting pipe 4.
[0033] The number of the exhaust pipes 7 is 2 and they are arranged in parallel, and the number of the exhaust ports 8, the shaft fans 9 and the steam extraction valves 10 is set to 2 corresponding to the number of the exhaust pipes 7. Setting up two exhaust pipes 7 can increase the efficiency of exhausting steam, and at the same time, each exhaust pipe 7 is equipped with a corresponding number of exhaust ports 8, shaft fans 9 and steam extraction valves 10, which can ensure the stability during exhaustion.
[0034] The water delivery expansion tank is connected to external water delivery via a water delivery pipe 16. External drains of each level of the steam turbine 1 body are discharged into the drain expansion tank 12 via the water delivery pipe 16.
[0035] The condenser 18 is connected to a vacuum pump 21, which forms negative pressure and is used to extract steam. The vacuum pump 21 is provided with an exhaust port 22, which is used for exhausting.
[0036] The connecting pipe 11 is led out on the exhaust pipe 7 before the shaft fan 9 and the steam extraction valve 10. The setting position takes into account the operation of the shaft fan 9 and the steam extraction valve 10. The steam extraction valve 10 controls the discharge of the connecting pipe 11. After the steam extraction valve 10 is closed, the connecting pipe 11 is directly connected to the shaft seal heater 5.
[0037] The condensing pipe 17 is provided with a condensing valve 19, and the number of condensing pipes 17 is 2, and the number of condensing valves 19 corresponding to the number of condensing pipes 17 is set to 2. The condensing valve 19 can control the steam flow of the condensing pipe 17 to ensure the normal operation of the condensing machine 18. At the same time, setting two condensing pipes 17 to connect to the condensing machine 18 can improve the efficiency, and each condensing pipe 17 is respectively provided with a condensing valve 19 for control.
[0038] Embodiment 2, as shown in Embodiment 1, a steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant, the shaft fan 9 draws the leaked steam from the front and rear steam seals of the steam turbine 1 into the shaft seal heater 5 to heat the condensed water, and at the same time recovers the high-quality steam that originally leaked to the outside, but the operation of the shaft fan 9 will inevitably consume part of the electricity, resulting in power consumption. At the same time, after being heated, part of the steam drawn by the shaft fan 9 condenses into water, and part of it is completely discharged into the atmosphere without being recovered, resulting in a waste of steam. In the cold winter, there is ice condensed from steam on the ground at the exhaust port 8 of the exhaust pipe 7 where the shaft fan 9 is located.
[0039] The exhaust steam of the steam turbine 1 after working is discharged into the condenser 18 with a pressure of -95KPa, and the external steam pipeline and the external drains of each level of the steam turbine 1 are discharged into the drain expansion tank 12. The drain expands and reduces the pressure inside the drain expansion tank 12, and finally the steam and condensed water are sucked into the condenser 18. In order to ensure the high vacuum inside the condenser 18, the condensing valves 19 connected between the drain expansion tank 12 and the condenser 18 are kept slightly open to ensure that the water and steam inside the drain expansion tank 12 can be discharged in time without affecting the vacuum of the condenser 18. At this time, the pressure inside the drain expansion tank 12 is about -20KPa.
[0040] The diameter of the connecting pipe 11 is DN20. The stop valve 13 provided on the connecting pipe 11 serves as the main valve of the connecting pipe 11. A ball valve 14 and a needle valve 15 are provided behind the stop valve 13 to adjust the stability of the internal pressure. During normal operation, the shaft fan 9 can be stopped, the shaft fan 9 and the steam extraction valve 10 can be closed, the stop valve 13, the ball valve 14 and the needle valve 15 of the connecting pipe 11 can be opened, and the internal pressure of the shaft seal heater 5 can be adjusted to be consistent with the pressure when the shaft fan 9 is running. At this time, not only can the factory electricity consumption be reduced, but also all the steam originally discharged can be recovered. The shaft fan 9 can be used as an emergency standby at this point. The shaft fan 9 has added interlocking protection. When the internal pressure of the shaft seal heater 5 exceeds the set value, the shaft fan 9 is started again to ensure that all parameters operate normally.
[0041] The standard parts used in the utility model can all be purchased from the market, special-shaped parts can be customized according to the description in the specification and the drawings, the specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art, the machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.
[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant. It is characterized in that It includes a steam turbine, wherein exhaust pipes are arranged at the front and rear ends of the steam turbine, an exhaust nozzle is arranged at the front end of the exhaust pipe, the exhaust pipe is connected to a collecting pipe, the collecting pipe is connected to a shaft seal heater, a drain pipe is arranged on the shaft seal heater, a drain port is arranged at the end of the drain pipe, a shaft fan and an extraction valve are arranged on the drain pipe, a connecting pipe is led out from the drain pipe and connected to a drain expansion tank, a stop valve, a ball valve and a needle valve are arranged on the connecting pipe, a condensing pipe is led out from the water supply expansion tank and connected to a condensing machine, and the condensing machine is connected to the steam turbine through the lead-out pipe.
2. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant according to claim 1, It is characterized in that The collecting pipe is provided with a collecting valve.
3. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant according to claim 1, It is characterized in that The number of the exhaust pipes is 2 and they are arranged in parallel, and the number of the exhaust ports, the shaft fans and the steam extraction valves is set to 2 corresponding to the number of the exhaust pipes.
4. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant according to claim 1, It is characterized in that The water delivery expansion tank is connected to external water delivery via a water delivery pipe.
5. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant according to claim 1, It is characterized in that The condenser is connected to a vacuum pump, and a discharge port is arranged on the vacuum pump.
6. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant according to claim 1, It is characterized in that The connecting pipe is led out on the exhaust pipe before the shaft fan and the steam extraction valve.
7. A steam turbine pipeline for reducing the self-consumption of electricity in a thermal power plant according to claim 1, It is characterized in that The condensing pipe is provided with a condensing valve, and the condensing pipe is provided with a condensing valve. The number of condensing pipes is 2, and the number of condensing valves corresponding to the number of condensing pipes is set to 2.