Thermal power generating unit for realizing reactive power output by using high and low bypass heat supply
By introducing high and low bypass heating systems into thermal power units, the problem of heating interruption during turbine failures or maintenance has been solved, achieving stable heating without power output and ensuring the safety and flexibility of the heating system.
Patent Information
- Application Number
- CN202423168483.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing heating systems are prone to heating interruptions during turbine failures or maintenance, leading to safety hazards. Current technology is insufficient to ensure the stable operation of the heating system when the unit is not connected to the grid.
By introducing a high- and low-voltage bypass heating system into the thermal power unit, and connecting it with the main unit vacuum pump, fan and steam pipeline, a heating method with no power output can be achieved, ensuring stable heating even when the steam turbine is not connected to the grid.
This enables the heating system of thermal power units to operate safely and stably even when the steam turbine is not connected to the grid, improving the flexibility of the heating method and avoiding the risk of heating interruption.
Smart Images
Figure CN223497966U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind turbine technology, specifically a thermal power unit that achieves zero power output by utilizing high and low bypass heating. Background Technology
[0002] Heating refers to the supply of heat to buildings to maintain a certain indoor temperature. It is a social service that addresses the basic heating needs of residents in northern my country during winter. Centralized heating, as an important component of modern urban infrastructure, not only bears the responsibility of providing a stable heat source for cities, but also plays a crucial role in improving residents' quality of life, promoting urbanization, conserving energy, and protecting the ecological environment. During the winter heating season, heating interruptions have occurred frequently due to turbine generator failures, posing significant safety hazards to ensuring people's livelihoods and heating supply. In such cases, utilizing high and low voltage bypasses for heating when the turbine generator set is not outputting power improves the flexibility of the unit's heating method. This ensures the safe and stable operation of the heating system even when the turbine generator set is not running or connected to the grid, which is of great significance for achieving safe heating.
[0003] The current technical solution for heating operation using high and low voltage bypasses when the unit has no power output is as follows:
[0004] 1. The boiler should be started according to the cold start procedure.
[0005] 2. Supply auxiliary steam to adjacent units and maintain normal auxiliary steam pressure; appropriately activate the deaerator for heating to increase feedwater temperature.
[0006] 3. Boiler ignition, turbine-side jacking oil and lubrication system operation, turning gear continuous operation for at least 12 hours.
[0007] 4. Before boiler ignition, start the main unit vacuum pump to draw a vacuum, close the exhaust valves of the 11th and 12th turbines to the main unit exhaust valve, and perform system vacuuming without engaging the shaft seal steam supply when the unit is cold (cylinder temperature is ambient temperature). Whether to engage the shaft seal system depends on the tightness of the high and medium pressure main steam valves.
[0008] 5. Open the three main steam condensate drain valves on the main steam pipeline to the fixed exhaust manual valve and electric valve. Close the main and reheat steam pipelines, cold reheat steam pipelines, and user exhaust condensate drain valves. Close the air valve on the main steam pipeline when pressure is detected. After the vacuum of the exhaust device stabilizes, decide whether to drain the condensate to the exhaust device based on the ambient temperature. (Drain the condensate to the exhaust device when the ambient temperature is greater than -10℃).
[0009] 6. After the boiler is ignited and pressurized, open the high-pressure bypass valve to prevent the boiler reheater from dry-burning. Strengthen on-site monitoring of cold reheat pipeline vibration. If pipeline vibration occurs, close the high-pressure bypass valve slightly to increase the warm-up time. After the warm-up is sufficient, slowly open the high-pressure bypass valve.
[0010] 7. When the reheat steam pressure reaches 0.5 MPa and the temperature exceeds 200℃, open the low-pressure bypass valve and simultaneously open the condensate drains from the reheat steam pipeline, cold reheat steam pipeline, and the user's exhaust system. (This operation should be performed when the ambient temperature is below -10℃.)
[0011] 8. Turn on the drain of the high and low pressure bypass heating pipeline of Unit 1 to warm up the system.
[0012] 9. Once the steam in the air-cooled island condenses and the unit back pressure drops below 20 kPa, gradually increase the opening of the high and low pressure bypasses of the turbine to ensure a steam flow rate of 400 t / h to the boiler superheater. Carefully monitor the operating parameters of the electric pumps. While ensuring the electric pumps do not exceed their rated output and the boiler tube wall temperatures remain normal, control the reheat steam pressure to 0.5 MPa. Simultaneously, increase the condensate pressure and control the temperature after the low-pressure bypass to not exceed 200℃ via the low-pressure bypass desuperheating water. Furthermore, closely monitor the low-pressure cylinder exhaust temperature to ensure it does not exceed 80℃. If a rise in the low-pressure cylinder exhaust temperature is detected, promptly activate the low-pressure cylinder downstream water spray to prevent steam from entering the low-pressure cylinder and causing excessive differential pressure.
[0013] 10. Temporarily disconnect the steam side of the No. 2 heating network and close the No. 2 heating network steam shut-off valve, check valve, and quick-closing valve.
[0014] After the high and low bypass heating pipelines of Unit 11.1 have been fully warmed up, close the drains of the left and right low bypasses and the main pipe, slowly close the isolation valves of the left and right low bypasses to the exhaust steam device, and wait until the pressure of the low bypass reaches 0.3MPa, slowly open the electric valve for steam extraction of the high and low bypass heating main pipe to supply steam to the heating network.
[0015] 12. By adjusting the throttling of the steam extraction electric valves on the left and right sides of the low-level bypass to the exhaust steam device, the heat supply of the heating network is gradually increased, ultimately achieving the required steam volume to meet the heating demand and maintaining stable parameter operation.
[0016] The above technical solutions have the following shortcomings: the existing heating is generally carried out under the condition of thermal power unit operation and grid connection, and the heating is connected to the heat network after the steam is extracted from the low-pressure cylinder of the steam turbine. Once the steam turbine or generator fails or is under maintenance, the heating will be interrupted. Utility Model Content
[0017] The purpose of this invention is to provide a thermal power unit that achieves zero power output by utilizing high and low bypass heating, in order to solve the problems mentioned in the background art.
[0018] To achieve the above objectives, this utility model provides the following technical solution:
[0019] A thermal power unit that achieves zero power output by utilizing high and low bypass heating includes a main vacuum pump. The main vacuum pump is connected to a first connector on one side via a first pipe and a second pipe, and to a first fan on the other side via a second connector. A reheat pipe is also fixedly connected to the other side of the first connector. A fourth pipe is also fixedly connected to the second connector. A second fan and a third connector are installed on the fourth pipe. A third pipe is fixedly connected to the third connector and is fixedly connected to one of the second connectors via the third pipe. The other end of the fourth pipe is fixedly connected to the main steam pipe via the fourth connector.
[0020] As a preferred embodiment of this utility model, the first connector and one side of the second pipe are connected by threads, and the other side of the second pipe is also connected by threads to the interfaces on the main vacuum pump and the first fan.
[0021] As a preferred embodiment of this utility model, the second pipeline is connected to the three-stage desuperheater of the exhaust device via the first fan.
[0022] As a preferred embodiment of this utility model, the main steam pipe and the fourth joint are connected by a thread, and both ends are respectively connected to the first station of the heating network and the heating steam main pipe of the heating network.
[0023] As a preferred embodiment of this utility model, the first pipe and the second pipe are pipes with diameters of 514×30mm and 920×10mm, respectively.
[0024] As a preferred embodiment of this utility model, the third pipe is a D529×10mm pipe.
[0025] As a preferred embodiment of this utility model, the main steam pipe adopts a main steam pipe with a diameter of 1200 mm.
[0026] Beneficial effects: In order to improve the flexibility of the unit's heating mode and ensure the safe and stable operation of the county heating system even when the unit is not running or connected to the grid, this utility model has successfully carried out a heating test using high and low bypasses with no power output of Unit 1. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of a thermal power unit that utilizes high and low bypass heating to achieve zero power output according to this utility model.
[0028] In the diagram: 1. Vacuum pump; 2. First pipe; 3. Second pipe; 4. First joint; 5. Second joint; 6. First fan; 7. Reheat pipe; 8. Fourth pipe; 9. Second fan; 10. Third joint; 11. Third pipe; 12. Fourth joint; 13. Main steam pipe. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0030] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.
[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0033] Please see Figure 1 This utility model provides a technical solution:
[0034] A thermal power unit that achieves zero power output by utilizing high and low bypass heating includes a main vacuum pump 1. The main vacuum pump 1 is connected to a first connector 4 on one side via a first pipe 2 and a second pipe 3, and to a first fan 6 on the other side via a second connector 5. A reheat pipe 7 is also fixedly connected to the other side of the first connector 4. A fourth pipe 8 is also fixedly connected to the second connector 5. A second fan 9 and a third connector 10 are installed on the fourth pipe 8. A third pipe 11 is fixedly connected to the third connector 10 and is fixedly connected to one of the second connectors 5 via the third pipe 11. The other end of the fourth pipe 8 is fixedly connected to the main steam pipe 13 via a fourth connector 12.
[0035] Specifically, the first connector 4 and the second pipe 3 are connected by threads on one side, and the other side of the second pipe 3 is also connected by threads to the interface on the main vacuum pump 1 and the first fan 6; the second pipe 3 is connected to the exhaust device three-stage desuperheater through the first fan 6; the main steam pipe 13 and the fourth connector 12 are connected by threads, and both ends are connected to the first station of the heating network and the heating steam header of the heating network, respectively; the first pipe 2 and the second pipe 3 are pipes with diameters of D514×30mm and D920×10mm, respectively; the third pipe 11 is a pipe with diameters of D529×10mm; the main steam pipe 13 is a main steam pipe with a diameter of 1200 mm.
[0036] Operating procedure: 1. Start the vacuum pump of Unit 1 and establish a vacuum through the exhaust system.
[0037] 2. Start the boiler return fan, induced draft fan, primary and secondary fans, and put the sonic soot blower and air preheater into operation.
[0038] 3. Ignition of Boiler No. 1.
[0039] 4. Put into operation the high and low bypass systems of Unit 1.
[0040] 5. All oil guns in boiler No. 1 have been removed.
[0041] 6. The average bed temperature on the front wall of Boiler No. 1 is above 800℃, and combustion is basically stable.
[0042] 7. Warming pipes for the high and low bypass heating systems of Unit 1.
[0043] 8. Disconnect from the No. 2 heating network system.
[0044] 9. The high and low pressure bypass heating system of Unit 1 is put into operation, and the primary system of the heating network begins to heat up.
[0045] 10. The heating network water supply temperature rises to 75℃, and the flow rate is 2200t / h.
[0046] 11. The heating network water temperature has risen to 87.7℃, and the steam extraction rate is 128t / h, which meets the current heating needs of the county town at the ambient temperature. The test is now complete. The high and low temperature bypass heating system of Unit 1 has been shut down, and Unit 2 has resumed normal heating operation.
Claims
1. A thermal power unit that achieves zero power output by utilizing high and low bypass heating, comprising a main vacuum pump (1), characterized in that: The main vacuum pump (1) is connected to a first connector (4) on one side via a first pipe (2) and a second pipe (3), and to a first blower (6) on the other side via a second connector (5). A reheat pipe (7) is also fixedly connected to the other side of the first connector (4). A fourth pipe (8) is also fixedly connected to the second connector (5). A second blower (9) and a third connector (10) are installed on the fourth pipe (8). A third pipe (11) is fixedly connected to the third connector (10) and is fixedly connected to one of the second connectors (5) via the third pipe (11). The other end of the fourth pipe (8) is fixedly connected to the main steam pipe (13) via the fourth connector (12).
2. A thermal power unit that achieves zero power output by utilizing high and low bypass heating according to claim 1, characterized in that: The first connector (4) and the second pipe (3) are connected by threads on one side, and the other side of the second pipe (3) is also connected by threads to the interface on the main vacuum pump (1) and the first fan (6).
3. A thermal power unit that achieves zero power output by utilizing high and low bypass heating according to claim 1, characterized in that: The second pipe (3) is connected to the exhaust device's three-stage desuperheater via the first fan (6).
4. A thermal power unit that achieves zero power output by utilizing high and low bypass heating as described in claim 1, characterized in that: The main steam pipe (13) and the fourth joint (12) are connected by threads, and both ends are connected to the first station of the heating network and the heating steam main pipe of the heating network, respectively.
5. A thermal power unit that achieves zero power output by utilizing high and low bypass heating according to claim 1, characterized in that: The first pipe (2) and the second pipe (3) are made of D514×30mm and D920×10mm respectively.
6. A thermal power unit that achieves zero power output by utilizing high and low bypass heating according to claim 1, characterized in that: The third pipe (11) is a D529×10mm pipe.
7. A thermal power unit that achieves zero power output by utilizing high and low bypass heating according to claim 1, characterized in that: The main steam pipe (13) has a diameter of 1200 mm.