Combined water supply device for cooling towers of backpressure steam turbine and postposition steam turbine

Abstract

The utility model discloses a combined water supply device for a backpressure steam turbine and a postposition steam turbine cooling tower, which comprises a backpressure steam turbine circulating water supply module and a postposition steam turbine circulating water supply module, and the backpressure steam turbine circulating water supply module is provided with a backpressure steam turbine mechanical ventilation cooling tower and a backpressure steam turbine. A rear steam turbine mechanical ventilation cooling tower and a rear steam turbine are arranged on the rear steam turbine circulating water supply module, and a connecting device between the back pressure steam turbine circulating water supply module and the rear steam turbine circulating water supply module comprises a mechanical ventilation cooling tower first communicating pipe and a mechanical ventilation cooling tower second communicating pipe. According to the combined water supply device, the cooling water amount of different circulating water supply modules can be flexibly adjusted, and the circulating water requirements of the back pressure steam turbine and the rear steam turbine are met at the same time under different thermal load conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy, especially a back pressure steam turbine and post steam turbine cooling tower combined water supply device. BACKGROUND

[0002] When the heating capacity is insufficient, the gas turbine back pressure machine generates electricity under the condition of operation, and steam needs to be discharged. On the one hand, it causes economic loss and energy waste, and on the other hand, it produces noise pollution and affects the surrounding residents. In order to avoid the shutdown of the back pressure steam turbine generator set and solve the phenomenon of power shortage, the back pressure steam turbine is changed into a steam turbine generator set that can generate electricity and provide heat, and the discharged steam is used to generate electricity, thereby improving the energy utilization efficiency. When building a combined heat and power unit, a circulating water supply module is usually set up to meet the increased circulating water volume when the back pressure steam turbine is changed into a steam turbine generator set. The circulating water supply modules are often independent of each other, and lack of adjustment flexibility.

[0003] In the prior art, a steam turbine circulating water waste heat utilization device disclosed in patent No. CN103726892A includes a heating circulating water supply system, which includes a heating water supply pipeline. One end of the heating water supply pipeline is connected with a condenser, and the other end is connected with control valve 3, control valve 6, a heating user pipe network, and control valve 5 in sequence, and then enters the condenser again. The comparative technology cannot flexibly combine the cooling water volume of different circulating water supply modules, and has poor stability. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the problem that in the prior art, when building a combined heat and power unit, a circulating water supply module is usually set up to meet the increased circulating water volume when the back pressure steam turbine is changed into a steam turbine generator set. The circulating water supply modules are often independent of each other, and lack of adjustment flexibility. The utility model provides a back pressure steam turbine and post steam turbine cooling tower combined water supply device that can be adjusted in multiple ways.

[0005] Another purpose of the utility model is to solve the problem that in the prior art, the pipeline is complex. The pipeline arrangement of the utility model is clear, and the overall maintenance is more convenient. The utility model provides a back pressure steam turbine and post steam turbine cooling tower combined water supply device that is convenient to maintain.

[0006] To achieve the above object, the utility model provides the following technical scheme: a back pressure steam turbine and post turbine cooling tower combined water supply device, the device includes back pressure steam turbine circulating water supply module and post turbine circulating water supply module, is equipped with back pressure steam turbine mechanical ventilation cooling tower and back pressure steam turbine on back pressure steam turbine circulating water supply module, is equipped with post turbine mechanical ventilation cooling tower and post turbine on post turbine circulating water supply module; the steam of back pressure steam turbine is used for power generation when the heating load is insufficient, and back pressure steam turbine circulating water supply module supplies back pressure steam turbine to the circulating water after cooling and temperature reduction, and the connecting device between back pressure steam turbine circulating water supply module and post turbine circulating water supply module includes mechanical ventilation cooling tower first intercommunication pipe and mechanical ventilation cooling tower second intercommunication pipe.

[0007] As preferred, the post turbine circulating water supply module pressurizes the circulating water after cooling and temperature reduction of the post turbine condenser outlet water and supplies back to the post turbine condenser inlet, and the connecting and adjusting device is arranged between the back pressure steam turbine circulating water supply module and the post turbine circulating water supply module.

[0008] As preferred, the back pressure steam turbine circulating water supply module and the post turbine circulating water supply module are provided with mechanical ventilation cooling towers, and the mechanical ventilation cooling towers transmit the heat of the circulating cooling water to the atmosphere.

[0009] As preferred, the post turbine circulating water supply module is provided with a post turbine circulating water pump, and the post turbine circulating water pump pressurizes the circulating water after cooling from the cooling tower pool and supplies to the post turbine condenser inlet.

[0010] As preferred, the back pressure steam turbine circulating water supply module is provided with a back pressure steam turbine circulating water pump, and the back pressure steam turbine circulating water pump pressurizes the circulating water after cooling from the cooling tower pool and supplies to the back pressure steam turbine condenser inlet.

[0011] As preferred, the adjusting device includes a flow meter and an adjusting valve, and the flow meter and the adjusting valve are arranged on the mechanical ventilation cooling tower second intercommunication pipe.

[0012] As preferred, the mechanical ventilation cooling tower first intercommunication pipe is connected at a low position between the back pressure steam turbine mechanical ventilation cooling tower and the post turbine mechanical ventilation cooling tower, and the mechanical ventilation cooling tower second intercommunication pipe is connected between the back pressure steam turbine mechanical ventilation cooling tower inlet mother pipe and the post turbine mechanical ventilation cooling tower inlet mother pipe.

[0013] Compared with the prior art, the utility model has the advantages that: the utility model can flexibly adjust the combined water supply device of different circulating water supply module cooling water quantity; the utility model can meet the circulating water demand of the back pressure steam turbine and the post turbine under different heat load conditions; the utility model has flexible pipeline arrangement, reduces equipment investment and saves land occupation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model discloses a combined water supply device schematic view.

[0015] In the figure: 1, back pressure turbine;2, post turbine;3, back pressure turbine mechanical ventilation cooling tower;4, back pressure turbine circulating water pump;5, post turbine mechanical ventilation cooling tower;6, post turbine circulating water pump;7, flowmeter;8, regulating valve;9, mechanical ventilation cooling tower first intercommunication pipe;10, mechanical ventilation cooling tower second intercommunication pipe. DETAILED DESCRIPTION

[0016] The technical scheme of the utility model will be described further in detail below by means of specific embodiments and in conjunction with the drawings, and the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0017] Embodiment 1: refer to Figure 1 The back pressure turbine 1 and the post turbine 2 work cooperatively, share the cooling water resources, and maintain operation through their respective circulating water supply modules. The circulating water supply module of the back pressure turbine 1 transports the used hot water to the mechanical ventilation cooling tower for cooling through the back pressure turbine 1, and then the cooled water is sent back to the back pressure turbine 1 to maintain the temperature required for its normal operation. This circulation not only reduces the demand for new water sources, but also reduces the environmental burden caused by heat emission.

[0018] The circulating water supply module of the post turbine 2 is more complex, as it not only needs to handle the condenser outlet water, but also needs to generate electricity using the steam discharged by the back pressure turbine 1 when the heating load is insufficient. This process not only improves energy utilization efficiency, but also reduces energy waste. The circulating water supply module of the post turbine 2 sends the cooled water back to the condenser inlet through pressurization, ensuring that the post turbine 2 can be effectively cooled under various load conditions.

[0019] In order to realize the coordinated operation of the two modules, communication and adjustment devices are set between the modules, which allow operators to flexibly adjust the water quantity of the two modules according to actual operation requirements and changes in thermal load. This adjustment mechanism not only improves the flexibility of the modules, but also ensures the stable operation and efficiency of the modules.

[0020] The communication device includes the first intercommunication pipe 9 and the second intercommunication pipe 10 of the mechanical ventilation cooling tower, which are responsible for distributing the circulating water to be cooled between the cooling towers and balancing the return water of the two circulating water modules. The adjustment device is composed of a flowmeter and a regulating valve, which are installed on the second intercommunication pipe for accurate flow control to adapt to different operating conditions.

[0021] The back pressure steam turbine mechanical draft cooling tower 3 and the back turbine mechanical draft cooling tower 5 are connected through the first connecting pipe 9 at the low level, and the water inlet main pipes are connected through the second connecting pipe 10. This design can flexibly adjust the water flow between the two cooling towers to adapt to different cooling requirements. The circulating water pump, including the back pressure steam turbine circulating water pump 4 and the back turbine circulating water pump 6, is responsible for pressurizing the cooled circulating water in the cooling tower pool and then supplying it to the condenser inlet of the back pressure steam turbine and the back turbine 2. Such a design not only improves the cooling efficiency, but also reduces the energy consumption of the device.

[0022] Embodiment 2: Reference Figure 1 The back pressure steam turbine 1 circulating water supply module effectively transports the used hot water to the mechanical draft cooling tower for cooling through the open water device. These cooled water is then sent back to the back pressure steam turbine 1 to maintain its operation at normal working temperature. The back turbine 2 circulating water supply module handles the condenser outlet water and needs to use the steam discharged by the back pressure steam turbine 1 to generate electricity when the heating load is insufficient. The back turbine 2 circulating water supply module sends the cooled water back to the condenser inlet through pressurization, ensuring that the back turbine 2 can be effectively cooled under various load conditions, which is crucial for maintaining the efficient operation of the turbine.

[0023] In order to realize the coordinated operation of the two modules, communication and adjustment devices are arranged between the modules, which allow the operator to flexibly adjust the water flow of the two devices according to the actual operation requirements and changes in thermal load. The communication device includes the first connecting pipe 9 and the second connecting pipe 10 of the mechanical draft cooling tower, which is responsible for distributing the circulating water to be cooled between the cooling towers and balancing the backwater of the two circulating water supply modules. The adjustment device is composed of flow meters and adjustment valves, which are installed on the second connecting pipe to accurately control the flow to adapt to different operating conditions and ensure that the device can operate efficiently under various working conditions.

[0024] The back pressure steam turbine mechanical draft cooling tower 3 and the back turbine mechanical draft cooling tower 5 are connected through the first connecting pipe 9 at the low level, and the water inlet main pipes are connected through the second connecting pipe 10. This design can flexibly adjust the water flow between the two cooling towers to adapt to different cooling requirements, and the circulating water pump, including the back pressure steam turbine circulating water pump 4 and the back turbine circulating water pump 6, is responsible for pressurizing the cooled circulating water in the cooling tower pool and then supplying it to the condenser inlet of the back pressure machine and the back turbine 2. Such a design not only improves the cooling efficiency, but also reduces the energy consumption of the device, achieving energy saving.

[0025] The interconnecting device between the circulating water supply modules is a key component that enables the efficient operation of the back pressure turbine and post turbine cooling tower combined water supply device. This interconnecting device is composed of two main connecting pipes: the mechanical draft cooling tower first connecting pipe 9 and the mechanical draft cooling tower second connecting pipe 10, which work together to ensure balance and coordination between the circulating water supply modules.

[0026] The main function of the mechanical draft cooling tower first connecting pipe 9 is to maintain the backwater balance of the two circulating water supply modules. After the cooling process is completed, the first connecting pipe 9 combines the backflow of cooling water from the back pressure turbine 1 and the post turbine 2, ensuring that the water volume between the two modules remains balanced. This balance is crucial for maintaining the stability of the entire water supply module, as it can prevent fluctuations in water pressure and efficiency caused by unbalanced water volume. The design of the first connecting pipe 9 also takes into account the flexibility of the device, allowing operators to adjust the backwater flow according to actual operating conditions to adapt to different workloads and environmental temperatures. By controlling the flow of circulating water and backwater balance, this interconnecting device provides a stable and efficient water circulation mechanism for the back pressure turbine and post turbine cooling tower combined water supply device.

[0027] The mechanical draft cooling tower second connecting pipe 10 focuses on distributing the circulating water to be cooled to different cooling towers. In this process, the second connecting pipe 10 plays a role in adjusting and distributing, which can dynamically adjust the flow of circulating water according to the actual cooling needs of the back pressure turbine 1 and the post turbine 2. This intelligent distribution mechanism can optimize the efficiency of water use, ensuring that each cooling tower can receive the appropriate amount of circulating water to achieve the best cooling effect. In addition, the second connecting pipe 10 helps to achieve uniform heat distribution within the device, reducing the risk of local overheating and protecting equipment from thermal stress damage.

[0028] Example 3: Reference Figure 1 The circulating water supply module equipped with the back pressure turbine 1 transports used hot water to the mechanical draft cooling tower for cooling treatment, and then the cooled water is circulated back to the back pressure turbine 1, ensuring that the equipment can operate stably at an appropriate temperature. This cycle effectively reduces dependence on external water sources and reduces the pressure on the environment caused by heat emission.

[0029] In contrast, the design of the post-turbine 2 circulating water supply module not only handles the hot water discharged from the condenser, but also uses the steam released by the backpressure turbine 1 to produce additional electricity when heating demand is insufficient. This design not only improves energy utilization and reduces waste, but also enhances the flexibility and adaptability of the device to different working conditions. The circulating water supply module of the post-turbine 2 re-sends cooling water back to the condenser through pressurization, ensuring effective cooling under any load condition, which is crucial for maintaining the efficient operation of the turbine.

[0030] To ensure the harmonious operation of the two circulating water supply modules, a special communication and adjustment device is designed between the modules, allowing operators to flexibly adjust the water flow of the two modules according to actual operation requirements and changes in thermal load. This adjustment mechanism greatly enhances the flexibility of the module and ensures stable and efficient operation of the module. The communication device includes a first communication pipe 9 and a second communication pipe 10, which are responsible for reasonably distributing the circulating water to be cooled between the cooling towers and maintaining the water balance of the two circulating water supply modules. The adjustment device consists of a flow meter and an adjustment valve installed on the second communication pipe, which can accurately control the water flow to adapt to different operating conditions and ensure efficient operation of the module under various working conditions.

[0031] The mechanical draft cooling tower 3 of the backpressure turbine and the mechanical draft cooling tower 5 of the post-turbine are connected to each other at the low point through the first communication pipe 9, while the water inlet mother pipe is connected to each other through the second communication pipe 10. This layout allows flexible adjustment of water flow between the two cooling towers to meet different cooling needs. The circulating water pump, including the backpressure turbine circulating water pump 4 and the post-turbine circulating water pump 6, is responsible for pressurizing the circulating water in the cooling tower pool and delivering it to the condenser inlet of the backpressure turbine and the post-turbine 2. This design not only improves cooling efficiency, but also reduces energy consumption of the module, achieving energy saving.

[0032] The communication device between the circulating water supply modules is crucial for the effective operation of the backpressure turbine and post-turbine cooling tower combined water supply device. This communication device includes two core communication pipes: the mechanical draft cooling tower first communication pipe 9 and the mechanical draft cooling tower second communication pipe 10, which together ensure the balance and coordination between the circulating water supply modules.

[0033] The primary task of the mechanical draft cooling tower first connecting pipe 9 is to maintain the water balance between the two circulating water supply modules. After the cooling process is completed, the first connecting pipe 9 combines the backflow of cooling water from the back pressure turbine 1 and the back turbine 2, ensuring that the water volume between the two modules remains balanced. This balance is crucial for the stability of the entire water supply module, as it can avoid water pressure fluctuations and efficiency reduction caused by water volume imbalance. The design of the first connecting pipe 9 takes into account the flexibility of the device, allowing operators to adjust the backflow according to actual operating conditions, to adapt to different workloads and environmental temperatures.

[0034] The mechanical draft cooling tower second connecting pipe 10 is responsible for diverting the circulating water to be cooled to each cooling tower, and in this process, it plays a key role in regulation and distribution. The second connecting pipe 10 can flexibly adjust the flow of circulating water according to the actual cooling needs of the back pressure turbine 1 and the back turbine 2, thereby improving the utilization efficiency of water resources and ensuring that each cooling tower receives an appropriate amount of circulating water to achieve the desired cooling effect. In addition, the second connecting pipe 10 helps to achieve uniform heat distribution within the device, reducing the risk of local overheating and protecting equipment from thermal stress damage.

[0035] The regulating device between the back pressure turbine 1 and the back turbine 2 circulating water supply module is an important part of ensuring the efficient operation of the device, which consists of a 7 flow meter and an 8 regulating valve installed on the mechanical draft cooling tower second connecting pipe 10. The design of this regulating device allows operators to accurately control the flow of water in the circulating water supply module, thereby achieving fine adjustment of the water flow between the cooling tower pools.

[0036] The flow meter 7 is responsible for real-time monitoring of the water flow in the second connecting pipe 10, providing accurate data support so that operators can adjust the water flow according to real-time needs. The data of the flow meter 7 is crucial for maintaining balance and optimizing cooling effect, as it can ensure that the circulating water supply module operates according to design parameters, avoiding the impact of cooling efficiency due to excessive or insufficient flow.

[0037] The regulating valve 8 operates according to the data provided by the flow meter 7, which can quickly respond to the operator's instructions to adjust the valve opening and thereby change the water flow through the second connecting pipe 10. The precise control of the regulating valve 8 helps to maintain the water flow balance between the back pressure turbine 1 and the back turbine 2 circulating water supply module, ensuring that the water volume between the two modules is reasonably distributed to meet their respective cooling needs.

[0038] As a preferred design, the backpressure turbine mechanical draft cooling tower 3 and the post-turbine mechanical draft cooling tower 5 are connected at a low level through the mechanical draft cooling tower first connecting pipe 9. This low-level connection design helps to achieve natural water flow between the two cooling towers, reducing the energy consumption of the water pump, while improving stability and safety. When needed, this connection mode can also serve as an emergency measure, allowing the water of one cooling tower to support the other, enhancing the flexibility and reliability of the device.

[0039] The water inlet main pipe of the backpressure turbine mechanical draft cooling tower 3 and the water inlet main pipe of the post-turbine mechanical draft cooling tower 5 are connected through the mechanical draft cooling tower second connecting pipe 10. This connection not only provides additional water flow adjustment capability, allowing flexible allocation of water resources between the two cooling towers. This design is particularly important when dealing with different load demands, as it allows the device to dynamically adjust the operating state of the cooling towers according to real-time thermal load changes, to achieve optimal cooling effect and energy utilization efficiency.

[0040] The present application is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application, which will be apparent to those skilled in the art.

Claims

1. A combined back pressure turbine and post-turbine cooling tower water supply device, characterized by, The device comprises a back pressure turbine circulating water supply module and a post turbine circulating water supply module, the back pressure turbine circulating water supply module is provided with a back pressure turbine mechanical draft cooling tower and a back pressure turbine, and the post turbine circulating water supply module is provided with a post turbine mechanical draft cooling tower and a post turbine. The post turbine generates electricity by using steam discharged by the back pressure turbine when the heating load is insufficient, the back pressure turbine circulating water supply module supplies circulating water cooled and lowered in temperature by the back pressure turbine to the back pressure turbine, and the communication device between the back pressure turbine circulating water supply module and the post turbine circulating water supply module comprises a mechanical draft cooling tower first communication pipe and a mechanical draft cooling tower second communication pipe.

2. The combined water supply device of a back pressure steam turbine and a post-positioned steam turbine cooling tower according to claim 1, characterized in that, The post turbine circulating water supply module supplies circulating water cooled and lowered in temperature by the post turbine condenser to the post turbine condenser inlet after being pressurized, and the communication and adjustment device is arranged between the back pressure turbine circulating water supply module and the post turbine circulating water supply module.

3. The combined water supply device of a back pressure steam turbine and a post-positioned steam turbine cooling tower according to claim 1 or 2, characterized in that, The back pressure turbine circulating water supply module and the post turbine circulating water supply module are provided with mechanical draft cooling towers, and the mechanical draft cooling towers transmit heat of the circulating cooling water to the atmosphere.

4. The combined water supply device of a back pressure steam turbine and a post-positioned steam turbine cooling tower according to claim 1 or 2, characterized in that, The post turbine circulating water supply module is provided with a post turbine circulating water pump, and the post turbine circulating water pump supplies the circulating water cooled in the cooling tower pool to the post turbine condenser inlet after being pressurized.

5. The combined feed of back pressure steam turbine and post-turbine cooling tower according to claim 4, characterized in that, The back pressure turbine circulating water supply module is provided with a back pressure turbine circulating water pump, and the back pressure turbine circulating water pump supplies the circulating water cooled in the cooling tower pool to the back pressure turbine condenser inlet after being pressurized.

6. The combined water supply device of a back pressure steam turbine and a post-positioned steam turbine cooling tower according to claim 1 or 5, characterized in that, The mechanical draft cooling tower first communication pipe distributes the circulating water to be cooled between the cooling towers, and the mechanical draft cooling tower second communication pipe balances the water level of the two circulating water supply modules.

7. The combined water supply device of a back pressure steam turbine and a post-positioned steam turbine cooling tower according to claim 2, characterized in that, The adjustment device comprises a flow meter and an adjustment valve, and the flow meter and the adjustment valve are arranged on the mechanical draft cooling tower second communication pipe.

8. The combined water supply device of the back pressure steam turbine and the post-positioned steam turbine cooling tower according to claim 5, characterized in that, The mechanical draft cooling tower first communication pipe is connected between the back pressure turbine mechanical draft cooling tower and the post turbine mechanical draft cooling tower at a low position, and the mechanical draft cooling tower second communication pipe is connected between the back pressure turbine mechanical draft cooling tower inlet mother pipe and the post turbine mechanical draft cooling tower inlet mother pipe.

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