Integrated vacuum pump system applied to energy saving of vacuum extraction of condenser in thermal power plant

Abstract

The utility model relates to the technical field of steam turbine vacuum system of thermal power plant, disclose a kind of integrated vacuum pump system for energy saving of thermal power plant condenser vacuum pumping, comprising: frequency conversion roots pump and water ring pump, the air inlet of frequency conversion roots pump and the air inlet of water ring pump are connected on the air extraction main pipe by switching valve, and the working of frequency conversion roots pump can be switched after the water ring pump starting system, the air outlet of frequency conversion roots pump and the air outlet of water ring pump are connected on the exhaust main pipe.The utility model uses efficient roots water ring vacuum pump group to solve the problem of high energy consumption of water ring pump, and the problem of the decline of air extraction performance when air temperature is high, selects frequency conversion motor to adjust the speed of roots pump to adjust steam extraction to adapt to the serious density change of condenser, ensure the vacuum degree of unit, reach the best power saving simultaneously, and the energy-saving effect is remarkable.It will provide energy-saving reconstruction scheme for the same type power plant, with important social and economic benefits.

Description

Technical Field

[0001] This utility model relates to the technical field of vacuum systems for steam turbines in thermal power plants, and more specifically, it relates to an integrated vacuum pump system for energy saving in condenser vacuum systems of thermal power plants. Background Technology

[0002] With the increasing national requirements for ultra-low emissions and energy conservation in coal-fired power plants, thermal power plants are increasingly focusing on improving the energy efficiency of steam turbines. As a crucial component of steam turbine cold-end optimization, the condenser vacuum system is receiving growing attention for its energy conservation and energy reduction capabilities.

[0003] The pumping performance of existing single-ring vacuum pumps is significantly affected by the operating water temperature. When the operating water temperature exceeds 35℃, the pumping capacity drops sharply by more than 80%, severely impacting the unit's operating efficiency. Therefore, there is an urgent need to provide an integrated vacuum pump system for energy saving in condenser vacuum pumping in thermal power plants to solve the above problems. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an integrated vacuum pump system for energy saving in condenser vacuum systems of thermal power plants, optimizing the operation of the unit's vacuum system, reducing energy consumption, and improving the system's safety and reliability.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants includes:

[0007] The system includes a variable frequency roots pump and a water ring pump. The air inlets of the variable frequency roots pump and the water ring pump are connected to the main exhaust pipe via a switching valve. After the system is started by the water ring pump, the operation of the intelligent variable frequency roots pump can be switched. The air outlets of the variable frequency roots pump and the water ring pump are connected to the exhaust main pipe.

[0008] As a further improvement to this utility model, the variable frequency Roots pump is driven by a variable frequency motor.

[0009] As a further improvement to this utility model, the air outlet of the water ring pump is connected to the air inlet of the gas-water separator, and the air outlet of the gas-water separator is connected to the exhaust manifold.

[0010] As a further improvement to this utility model, the bottom of the gas-water separator is connected to the water supply port of the water ring pump via a circulating liquid pipe.

[0011] As a further improvement to this utility model, a heat exchanger is provided on the circulating liquid pipe, and the circulating liquid pipe between the heat exchanger and the water supply port of the water ring pump is designed at an inclination.

[0012] As a further improvement to this utility model, several valves are provided on the extraction main pipe, the exhaust main pipe and the circulating liquid pipe.

[0013] As a further improvement to this utility model, the variable frequency Roots pump is mounted on a steel structure frame, and a raised platform is also provided on the steel structure frame, with the variable frequency Roots pump mounted on the raised platform.

[0014] As a further improvement to this utility model, the gas-water separator and the heat exchanger are respectively located on the steel structure frame on both sides of the variable frequency Roots pump, and both the gas-water separator and the heat exchanger are horizontally designed.

[0015] The beneficial technical effects of this utility model are:

[0016] This invention utilizes a high-efficiency Roots water ring vacuum pump unit to address the problems of high energy consumption and decreased pumping performance of water ring pumps at high temperatures. A variable frequency motor is selected to adjust the Roots pump speed and steam extraction volume to adapt to severe changes in condenser tightness, ensuring optimal unit vacuum while achieving energy savings. The energy-saving effect is significant. This invention will provide a referable energy-saving retrofit solution for similar power plants, possessing important social and economic benefits. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a partial three-dimensional schematic diagram of the present invention.

[0019] In the diagram: 1. Steel frame; 2. Raised platform; 3. Variable frequency Roots pump; 4. Switching valve; 5. Air extraction main pipe; 6. Water ring pump; 7. Exhaust main pipe; 8. Gas-liquid separator; 9. Circulating liquid pipe; 10. Heat exchanger; 11. Variable frequency motor. Detailed Implementation

[0020] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] Combination Figure 1 - Figure 2 The present invention provides the following embodiments:

[0022] An integrated vacuum pump system for energy saving in condenser vacuum pumping at thermal power plants includes: a variable frequency Roots pump 3 and a water ring pump 6. The inlets of the variable frequency Roots pump 3 and the water ring pump 6 are connected to the main extraction pipe 5 via a switching valve 4. After the system is started by the water ring pump 6, the operation of the variable frequency Roots pump 3 can be switched. The outlets of the variable frequency Roots pump 3 and the water ring pump 6 are connected to the exhaust main pipe 7. In this embodiment, the variable frequency Roots pump 3 adopts a variable frequency design, which can adjust the Roots pump speed in real time according to the changes in the tightness of the condenser vacuum system, ensuring the unit vacuum level while achieving the best energy-saving effect.

[0023] The operating mode is optimized. For example, during unit startup, the water ring pump 6 is used to establish a vacuum; after the unit is running normally, the system switches to the variable frequency Roots pump 3 to maintain the vacuum, with the water ring pump 6 serving as a backup, ensuring the system's high efficiency and reliability. If a serious leak occurs in the unit's vacuum system or the variable frequency Roots pump 3 fails to maintain the vacuum, the backup vacuum pump can be put into operation to ensure system safety. When the variable frequency Roots pump 3 is under maintenance or malfunctions, the water ring pump 6 can be immediately put into operation to ensure the continuity and stability of the unit's vacuum system.

[0024] As another preferred embodiment of this utility model, the variable frequency Roots pump 3 is driven by the variable frequency motor 11. Specifically, the speed can be adjusted in real time to ensure the vacuum level of the unit while achieving the best energy-saving effect.

[0025] In another preferred embodiment of this utility model, the outlet of the water ring pump 6 is connected to the inlet of the gas-water separator 8, and the outlet of the gas-water separator 8 is connected to the exhaust manifold 7. Referring to the accompanying drawings, in this embodiment, the gas-water separator 8 can be used for gas-water separation, and the separated gas is discharged through the exhaust manifold 7.

[0026] As another preferred embodiment of this utility model, the bottom of the gas-liquid separator 8 is connected to the water supply port of the water ring pump 6 via a circulating liquid pipe 9. Combined with the above, the addition of the gas-liquid separator 8 also enables the circulation of the working fluid of the water ring pump 6.

[0027] As another preferred embodiment of this utility model, a heat exchanger 10 is provided on the circulating liquid pipe 9, and the circulating liquid pipe 9 between the heat exchanger 10 and the water supply port of the water ring pump 6 is designed at an inclination. Specifically, after the working fluid is separated by the gas-liquid separator 8, it enters the heat exchanger 10 for cooling, and then enters the water ring pump 6, combined with... Figure 2 One end of the circulating fluid pipe 9 is designed to be angled.

[0028] As another preferred embodiment of this utility model, several valves are provided on the extraction main pipe 5, the exhaust main pipe 7, and the circulating liquid pipe 9. Closing the valves allows for switching of the pipeline. In addition, relevant valves can be designed according to the gas flow direction shown in the attached drawings to prevent backflow.

[0029] As another preferred embodiment of this utility model, the variable frequency Roots pump 3 is mounted on a steel structure frame 1, and a raised platform 2 is also provided on the steel structure frame 1, with the variable frequency Roots pump 3 mounted on the raised platform 2. Combined with... Figure 2 In this embodiment, the variable frequency Roots pump 3 and the water ring pump 6 are designed on a single frame. The steel structure frame 1 and the raised platform 2 are both steel structures. The raised platform 2 can be regarded as part of the steel structure frame 1, which can also save floor space and is conducive to improvement in existing thermal power plant sites.

[0030] As another preferred embodiment of this utility model, the gas-liquid separator 8 and the heat exchanger 10 are respectively located on the steel structure frame 1 on both sides of the variable frequency Roots pump 3, and both the gas-liquid separator 8 and the heat exchanger 10 are horizontally designed. This horizontal design achieves gas-liquid separation and working fluid circulation, and also meets the aforementioned space requirements.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants, characterized in that, include: The variable frequency Roots pump (3) and the water ring pump (6) are connected to the air extraction main pipe (5) through the switching valve (4). After the system is started by the water ring pump (6), the variable frequency Roots pump (3) can be switched to work. The air outlets of the variable frequency Roots pump (3) and the water ring pump (6) are connected to the exhaust main pipe (7).

2. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 1, characterized in that, The variable frequency Roots pump (3) is driven by a variable frequency motor (11).

3. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 1, characterized in that, The outlet of the water ring pump (6) is connected to the inlet of the gas-water separator (8), and the outlet of the gas-water separator (8) is connected to the exhaust manifold (7).

4. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 3, characterized in that, The bottom of the gas-water separator (8) is connected to the water supply port of the water ring pump (6) via a circulating liquid pipe (9).

5. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 4, characterized in that, A heat exchanger (10) is provided on the circulating liquid pipe (9), and the circulating liquid pipe (9) between the heat exchanger (10) and the water supply port of the water ring pump (6) is designed to be inclined.

6. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 5, characterized in that, Several valves are provided on the extraction main pipe (5), the exhaust main pipe (7), and the circulating liquid pipe (9).

7. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 6, characterized in that, The variable frequency Roots pump (3) is installed on the steel structure frame (1), and the steel structure frame (1) is also provided with a raised platform (2), and the variable frequency Roots pump (3) is installed on the raised platform (2).

8. The integrated vacuum pump system for energy saving in condenser vacuuming of thermal power plants according to claim 7, characterized in that, The gas-water separator (8) and the heat exchanger (10) are respectively located on the steel structure frame (1) on both sides of the variable frequency Roots pump (3). Both the gas-water separator (8) and the heat exchanger (10) are horizontally designed.

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