TWM601330U - Energy-saving vacuum unit for improving vacuum degree of condenser of thermal power plant - Google Patents

Abstract

An energy-saving vacuum unit for improving the vacuum degree of a condenser of a thermal power plant is installed at the back end of a condenser. The condenser includes a vacuum manifold for receiving water vapor input from outside; the energy-saving vacuum unit includes at least A valve is arranged on the vacuum manifold; a foreline pump, the inlet of the foreline pump is connected to an air inlet pipe; at least one roots vacuum pump, including a main roots vacuum pump, the inlet of the main roots vacuum pump is connected to The rear end of the vacuum manifold; when the at least one roots vacuum pump only includes the main roots vacuum pump, the exhaust port of the main roots vacuum pump is connected to the backing pump via the intake pipe; when the at least one roots vacuum pump When the Roots vacuum pump is multiple Roots vacuum pumps, it still includes at least one intermediate Roots vacuum pump. The exhaust port of the main Roots vacuum pump is connected in series to a corresponding intermediate Roots vacuum pump. They are also connected in series; the intermediate Roots vacuum pump at the last stage is connected to the foreline pump via the intake pipe; the intake pipe is equipped with a one-way valve to prevent atmospheric backflow into the Roots vacuum pump and The condenser.

Description

Energy-saving vacuum unit for improving vacuum degree of condenser of thermal power plant

This creation is related to vacuum pump systems, especially an energy-saving vacuum unit used to improve the vacuum of condensers in thermal power plants.

In a thermal power plant, the condenser of the steam turbine generator unit operates under vacuum conditions. One of the main functions of the steam turbine condenser is to ensure the vacuum condition of the generator set. The vacuum degree of the condenser will directly affect the coal or gas efficiency of the steam turbine unit. According to the current domestic 50MW small generator set to 1000MW large generator set, every increase of 1kPa in vacuum can save 2-4 grams of coal consumption per kilowatt-hour of electricity. There are many factors that affect the vacuum degree of condensers in thermal power plants. For example, the design values of condensers of different manufacturers will be different when leaving the factory, the difference in vacuum caused by cooling methods (air cooling, water cooling, etc.), changes in cooling water conditions (mainly water temperature and water volume), and cooling efficiency (Cooling water pipe fouling, etc.) differences, condenser vacuum tightness maintenance level, and the capacity of vacuum obtaining equipment. However, there is no successful case in which the vacuum maintenance system of the condenser has been innovatively modified through a small investment in order to improve the vacuum degree of the condenser to a certain extent.

At present, most common condenser vacuum systems in thermal power plants are large water ring pumps or other forms of systems, and a few still retain steam extraction systems and water jet pump extraction systems. After the above vacuuming system establishes the vacuum of the condenser (the time is short, generally no more than 2 hours), it is only used to maintain the vacuum of the condenser, which is to continuously extract the condenser in the continuous operation. Non-condensable gas, otherwise true The vacancy will reduce the efficiency of the condenser due to the incompressible non-condensable gas leaking into the condenser, making its vacuum worse.

However, most of the vacuum pumps used in power plants have the following problems:

(1) The existing water ring vacuum pump of the condenser affects the economy of the generator set and increases coal consumption:

Although the large water ring pump has a large amount of air extraction in the rough vacuum stage of the condenser startup stage, when the vacuum degree of the condenser gradually increases, the air extraction capacity of the water ring pump begins to decay. And when approaching the ultimate vacuum, the pumping capacity decays faster, and "cavitation" phenomenon occurs. At the same time, similar to the properties of the condenser, the pumping capacity of the water ring pump and the ultimate vacuum value are all related to the working water temperature. In summer when the water temperature is high, the water ring pump is more prone to cavitation, and the pumping capacity is attenuated to one-third or even lower of the theoretical pumping capacity. When the pumping capacity of the water ring pump cannot meet the needs of the condenser to maintain a high vacuum, the vacuum of the condenser will deteriorate. The efficiency of steam turbines has deteriorated and coal consumption for power generation has increased. The accumulated direct economic losses or potential energy-saving benefits are in the hundreds of millions.

(2) At present, most condenser vacuum energy-saving units on the market have limited capacity:

Although there are already many condenser vacuum energy-saving units operating in various power plants, the design purpose of condenser energy-saving units is to keep the vacuum with the original system without falling, so the extraction capacity of various types of condenser vacuum energy-saving units All are limited. The only thing that can be done is to save energy as much as possible while maintaining the vacuum degree. However, there is still the phenomenon that the condenser vacuum cannot be maintained when the condenser leakage rate increases or other abnormal conditions. It is possible to increase the vacuum of the condenser.

(3) Test verification:

The inventors’ experiments in the vacuum systems of condensers in multiple power plants show that the vacuum degree of some condensers can be higher than the conventionally maintained vacuum degree of the large water ring pump of the original design under the condition of increasing the pumping capacity of the vacuum pump. Therefore, the inventor of this case hopes to transform the existing large water ring pump and energy-saving vacuum Units to increase the vacuum, thereby increasing the coal-fired efficiency of the generator, and finally achieve the purpose of further energy saving and emission reduction.

Therefore, the purpose of this creation is to solve the above-mentioned conventional technical problems. In this creation, an energy-saving vacuum unit for improving the vacuum of the condenser of a thermal power plant is proposed, which is used in the vacuum system of the condenser of the thermal power plant. An energy-saving vacuum pump system that improves the vacuum of the condenser. In this case, a high-efficiency roots vacuum pump is used to connect to the corresponding backing pump (such as a water ring vacuum pump). With this roots vacuum pump, the pumping capacity and ultimate vacuum of the backing pump can be improved, so the condenser extraction can be effectively improved. The pumping performance of the vacuum system achieves the purpose of improving the vacuum of the condenser. Therefore, through the structure of this case, not only can the power plant condenser vacuum maintenance system achieve a high percentage of electricity saving (up to 80%), but also because of the specially designed larger extraction capacity and higher vacuum, it can condense steam The non-condensable gas leaked by the original large water ring pump due to the limitation of pumping capacity and ultimate vacuum is removed (the non-condensable gas leaking in the condenser will occupy the space of condensable steam, thus Affect the vacuum effect of the condenser), so the operating vacuum of the entire condenser can be improved, and the benefits of coal saving are significant. Compared with the vacuum system composed of the large water ring pumps currently used in power plants and the existing retrofit technologies on the market, the advantage of this case is that the application of one or more high-efficiency Roots vacuum pumps greatly increases the vacuum performance of the front-stage water ring vacuum pumps. Generally speaking, the factors that affect the vacuum of the condenser in thermal power plants are mainly the design value of the condenser, the cooling method and cooling water conditions, and the maintenance level of the condenser. In this case, the reformation of the vacuum system of the condenser has low investment costs and significant benefits. In this case, by improving the vacuum value of the condenser and increasing the efficiency of power generation, it is expected to achieve the effect of saving thousands of tons of coal and power consumption in factories every year. Of course, this technique cannot arbitrarily increase the vacuum degree, because when the actual vacuum degree in the condenser does not need to be close to the complete absence of non-condensable gas, plus a certain amount After the “over-vacuum difference”, the moisture in the condenser will accelerate to evaporate, thereby bringing the vacuum temperature to the new equilibrium point. This degree of vacuum cannot be much different from the theoretical saturation pressure of water vapor. However, the intention of the present invention is only to increase the vacuum degree of the condenser by 0.1-1 kPa. This has been actually confirmed.

To achieve the above objective, this creation proposes an energy-saving vacuum unit for improving the vacuum of the condenser of a thermal power plant. The energy-saving vacuum unit is installed at the back end of a condenser, and the condenser includes a vacuum header for Receiving external input of water vapor; the energy-saving vacuum unit includes at least one valve set on the vacuum manifold for closing the pipeline to prevent the atmosphere from being poured into the condenser; a backing pump, the backing pump including an inlet And an exhaust port; the inlet of the foreline pump is connected to an intake pipe; at least one roots vacuum pump includes a main roots vacuum pump, the main roots vacuum pump includes an inlet and an exhaust port, the main roots vacuum pump The inlet of the vacuum pump is connected to the rear end of the vacuum manifold; wherein when the at least one Roots vacuum pump only includes the main Roots vacuum pump, the exhaust port of the main Roots vacuum pump is connected to the front via the intake pipe. The inlet of the stage pump; wherein when the at least one roots vacuum pump is multiple roots vacuum pumps, the multiple roots vacuum pumps are connected in series, and the multiple roots vacuum pumps include the main roots vacuum pump and at least one intermediate stage Roots vacuum pumps, each of the intermediate-stage Roots vacuum pumps includes an inlet and an exhaust port, the exhaust of the main roots vacuum pump is connected to the inlet of a corresponding intermediate-stage Roots vacuum pump via a conveying pipe, and each The exhaust port of the intermediate Roots vacuum pump of the first stage is connected to the inlet of the intermediate Roots vacuum pump of the next stage via a conveying pipe; and the exhaust port of the intermediate Roots vacuum pump located in the last stage is via the intake pipe Connected to the inlet of the backing pump; where a one-way valve is arranged on the air intake pipe to avoid the sudden shutdown of the equipment or other emergencies causing the atmosphere to be poured into the Roots vacuum pump and the condenser from the vacuum system in.

From the following description, you can further understand the characteristics and advantages of this creation. Please refer to the Consider the attached drawings.

1‧‧‧Vacuum mother tube

2‧‧‧Valve

3‧‧‧Main Roots Vacuum Pump

4‧‧‧Intermediate Roots Vacuum Pump

6‧‧‧One-way valve

7‧‧‧Foreline pump

11‧‧‧Small diameter return pipe

12‧‧‧Backwater destination

30‧‧‧Roots Vacuum Pump

31‧‧‧Entrance

32‧‧‧Exhaust port

35‧‧‧Conveying pipeline

41‧‧‧Entrance

42‧‧‧Exhaust port

45‧‧‧Conveying pipeline

71‧‧‧Entrance

72‧‧‧Exhaust port

75‧‧‧Air intake pipe

80‧‧‧heat exchanger

91‧‧‧Cooling mechanism

92‧‧‧Drive motor

93‧‧‧Pressure Transmitter

94‧‧‧Temperature Transmitter

95‧‧‧Control mechanism

100‧‧‧Condenser

300‧‧‧Energy-saving vacuum unit

301‧‧‧Pump housing

911‧‧‧Cooling water pan or cooling water coil

912‧‧‧Inter-stage heat exchanger cooler

Figure 1 shows a schematic diagram of the component combination in this case.

Figure 2 shows a schematic diagram of another component combination in this case.

Fig. 3 shows a block diagram of the roots vacuum pump, related electrical components, and detection control circuit in this case.

With regard to the structural composition of this case, and the effects and advantages that can be produced, in conjunction with the drawings, a preferred embodiment of this case is described in detail as follows.

Please refer to Figures 1 to 3, which show the energy-saving vacuum unit 300 used to improve the vacuum of the condenser of a thermal power plant. The energy-saving vacuum unit 300 is installed at the back end of a condenser 100. The steam generator 100 includes a vacuum manifold 1 for receiving water vapor input from the outside. The energy-saving vacuum unit 300 includes the following components:

At least one valve 2 is arranged on the vacuum manifold 1, and the at least one valve 2 may include an automatic valve (such as a pneumatic valve or an electric valve) to quickly close the pipeline in the event of an unexpected shutdown to prevent air from being poured into the condenser 100 . The at least one valve 2 may also include a manual valve, which serves as a backup valve for the automatic valve. A small-diameter return pipe 11 is provided in front of the valve 2 to connect between the vacuum main pipe 1 and the return destination 12 to prevent the condensed water of the vacuum main pipe 1 from entering the vacuum pump.

A backing pump 7 includes an inlet 71 and an exhaust port 72. The inlet 71 of the backing pump 7 is connected to an intake pipe 75. The backing pump 7 can be a water ring vacuum pump (for example, a large water ring vacuum pump currently used in a power plant, or a small water ring vacuum pump in other energy-saving vacuum units), or a non-water ring backing vacuum pump that can directly exhaust the atmosphere.

At least one roots vacuum pump 30 includes a main roots vacuum pump 3, the main roots vacuum pump 3 includes an inlet 31 and an exhaust port 32, the inlet 31 of the main roots vacuum pump 3 is connected to the vacuum manifold 1 rear end.

As shown in FIG. 1, when the at least one roots vacuum pump 30 only includes the main roots vacuum pump 3, the exhaust port 32 of the main roots vacuum pump 3 is connected to the backing pump 7 via the intake pipe 75 The entrance 71.

As shown in FIG. 2, when the at least one roots vacuum pump 30 is a plurality of roots vacuum pumps 30, the plurality of roots vacuum pumps 3 are connected in series, and the plurality of roots vacuum pumps 30 include the main roots vacuum pump 3 and at least one intermediate Roots vacuum pump 4, each intermediate Roots vacuum pump 4 includes an inlet 41 and an exhaust port 42, the exhaust port 32 of the main Roots vacuum pump 3 is connected to the main roots vacuum pump 3 via a conveying pipe 35 A corresponding inlet 41 of the intermediate-stage Roots vacuum pump 4, and the exhaust port 42 of the intermediate-stage Roots vacuum pump 4 of each stage is connected to the inlet 41 of the intermediate-stage Roots vacuum pump 4 of the next stage via a conveying pipe 45. The exhaust port 42 of the intermediate Roots vacuum pump 4 located at the final stage is connected to the inlet 71 of the backing pump 7 via the intake pipe 75. The application of the multiple Roots vacuum pumps 30 in series can share the pressure difference that each stage of Roots vacuum pump 30 needs to bear, thereby sharing the heat generated in the compressed air process, so that each Roots vacuum pump 30 will not be stuck due to overheating. Dead, but can run stably.

Wherein each of the delivery pipelines 35, 45 and the intake pipeline 75 can be equipped with an exhaust port cooler or heat exchanger 80 to prevent the vacuum pump compressed gas of the previous stage from generating excessively high temperature and affecting the next stage. Safe operation of the vacuum pump.

Wherein, a one-way valve 6 is arranged on the intake pipe 75 to prevent the air from being poured into the Roots vacuum pump 30 and the condenser 100 from the vacuum system due to sudden shutdown of the equipment or other emergencies.

In practical applications, the backing pump 7 can be a water ring vacuum pump in the existing condenser vacuum maintenance system of a power plant, or a liquid ring pump in a condenser vacuum maintenance energy-saving vacuum unit, or the entire condenser Steam turbine vacuum maintains energy-saving vacuum unit.

Each of the roots vacuum pumps 30 is any type of roots vacuum pump (including an air-cooled roots vacuum pump), such as a two-blade or three-blade roots vacuum pump or an air-cooled roots vacuum pump.

When the at least one roots vacuum pump 30 is a plurality of roots vacuum pumps 30, a three-way valve is arranged on the vacuum main pipe 1 and a vacuum pipe is added to the inlet of the main roots vacuum pump 3. When the at least one roots vacuum pump 30 is a single roots vacuum pump 30, it needs to be modified to the original vacuum pipeline at the inlet of the large water ring pump (that is, the backing pump 7) used in the thermal power plant, so that the main roots vacuum pump 3 Have enough installation space.

FIG. 3 shows a block diagram of the electromechanical components of the roots vacuum pump 30, which are mainly used to display related electrical components and detection control circuits. The roots vacuum pump 30 is connected to a drive motor 92, and the drive motor 92 is used to drive the roots vacuum pump 30. The roots vacuum pump 30 is further connected to a cooling mechanism 91, and the cooling mechanism 91 is used to input cooling water to the roots vacuum pump 30 for cooling. The cooling mechanism 91 further includes a cooling water pan or a cooling water coil 911 or an inter-stage heat exchange cooler 912 for reducing the exhaust gas temperature and the temperature of the pump casing 301. The roots vacuum pump 30 is further equipped with a pressure transmitter 93 and a temperature transmitter 94, and the pressure transmitter 93 may be located at the entrance of the roots vacuum pump 30. The pressure transmitter 93 is used to detect the pipeline pressure of the roots vacuum pump 30, and the temperature transmitter 94 is used to detect the temperature of the roots vacuum pump 30. The pressure transmitter 93 and the temperature transmitter 94 are connected to a control mechanism 95, and the control mechanism 95 is connected to the drive motor 92 and the cooling mechanism 91. The control mechanism 95 receives the pressure value and temperature value detected by the pressure transmitter 93 and the temperature transmitter 94, and controls the drive motor 92 and the cooling mechanism 91 to protect the stable operation of the equipment. The pressure transmitter 93 and the temperature transmitter 94 transmit their detection values to the meter so that maintenance personnel can monitor. The above-mentioned pressure transmitter 93, the temperature transmitter 94 and the relevant value of the control mechanism 95 can also be transmitted to the control center of the power plant (Figure Not shown in) for unified monitoring.

The control mechanism 95 can control the drive motor 92, and control the roots vacuum pump 30 in a frequency conversion manner, and adjust its performance according to the frequency conversion characteristics. Variable frequency start can ensure electrical safety and stability, and real-time adjustment can adapt to the fluctuation of condenser 100 operating conditions. The roots vacuum pump 30 runs at a low frequency when the condenser 100 works well to achieve energy-saving effects. When the working conditions are poor or the vacuum system is expected to exert more power, high-frequency operation is required to give full play to the pumping performance of the Roots vacuum pump.

The advantage of this case is that one or more high-efficiency Roots vacuum pumps are connected to the corresponding backing pumps (such as water ring vacuum pumps). The one or more Roots vacuum pumps can improve the pumping capacity of the backing pumps. And the ultimate vacuum, so it can effectively improve the pumping performance of the condenser vacuum system, and achieve the purpose of improving the vacuum of the condenser. Therefore, through the structure of this case, not only can the power plant achieve a high proportion of electricity saving (up to 80%), but also because of the larger extraction capacity and higher vacuum, the condenser can be replaced by the original large water ring. The non-condensable gas leaked by the pump is more thoroughly removed (the non-condensable gas leaking in the condenser will occupy the space of the condensable steam, thereby affecting the effect of the condenser to form a vacuum), and the condensation can be used in addition The water volatilizes again to balance the kinetic energy pressure difference before the vacuum of the condenser, so as to improve the operating vacuum of the entire condenser and achieve significant coal savings. Compared with the vacuum system composed of the large water ring pumps currently used in power plants and the existing retrofit technologies on the market, the advantage of this case is that the application of one or more high-efficiency Roots vacuum pumps greatly increases the vacuum performance of the front-stage water ring vacuum pumps. Generally speaking, the factors that affect the vacuum of the condenser in thermal power plants are mainly the design value of the condenser, the cooling method and cooling water conditions, and the maintenance level of the condenser. In this case, the reformation of the vacuum system of the condenser has low investment costs and significant benefits. In this case, by improving the vacuum value of the condenser and increasing the power generation efficiency, it is expected that a large-scale power plant can save thousands of tons of coal and power consumption in factories every year.

In summary, the humanized and considerate design of this case quite meets actual needs. Compared with the conventional technology, the specific improvement of the existing defects is obviously a breakthrough advantage, and it does have an increase in efficacy and is not easy to achieve. This case has not been disclosed or disclosed in domestic and foreign documents and markets, and it has complied with the provisions of the Patent Law.

The above detailed description is a specific description of a feasible embodiment of this creation, but this embodiment is not intended to limit the scope of the creation of the patent. Any equivalent implementation or modification that does not deviate from the spirit of the creation technique should be included in In the scope of the patent in this case.

1‧‧‧Vacuum mother tube

2‧‧‧Valve

3‧‧‧Main Roots Vacuum Pump

31‧‧‧Entrance

32‧‧‧Exhaust port

71‧‧‧Entrance

6‧‧‧One-way valve

7‧‧‧Foreline pump

11‧‧‧Small diameter return pipe

12‧‧‧Backwater destination

30‧‧‧Roots Vacuum Pump

72‧‧‧Exhaust port

75‧‧‧Air intake pipe

80‧‧‧heat exchanger

100‧‧‧Condenser

300‧‧‧Energy-saving vacuum unit

Claims (10)

An energy-saving vacuum unit for improving the vacuum degree of a condenser of a thermal power plant, wherein the energy-saving vacuum unit is installed at the back end of a condenser, and the condenser includes a vacuum manifold for receiving external input water vapor; The energy-saving vacuum unit contains: At least one valve is arranged on the vacuum main pipe to close the pipeline and prevent the air from being poured into the condenser; A foreline pump, the foreline pump includes an inlet and an exhaust port; the inlet of the foreline pump is connected to an air inlet pipe; At least one roots vacuum pump, including a main roots vacuum pump, the main roots vacuum pump including an inlet and an exhaust port, the inlet of the main roots vacuum pump is connected to the back end of the vacuum manifold; Wherein when the at least one roots vacuum pump only includes the main roots vacuum pump, the exhaust port of the main roots vacuum pump is connected to the inlet of the backing pump via the air inlet pipe; When the at least one roots vacuum pump is multiple roots vacuum pumps, the multiple roots vacuum pumps are connected in series, and the multiple roots vacuum pumps include the main roots vacuum pump and at least one intermediate stage roots vacuum pump, each The intermediate stage Roots vacuum pump includes an inlet and an exhaust port. The exhaust port of the main Roots vacuum pump is connected to the inlet of a corresponding intermediate stage Roots vacuum pump via a conveying pipe, and the intermediate stage of each stage The exhaust port of the Roots vacuum pump is connected to the inlet of the next-stage intermediate Roots vacuum pump via a delivery pipe; and the exhaust port of the intermediate Roots vacuum pump located in the last stage is connected to the front stage via the intake pipe The inlet of the pump; Wherein, a one-way valve is arranged on the air intake pipe to avoid that the air is poured back into the Roots vacuum pump and the condenser from the vacuum system due to sudden shutdown of the equipment or other emergencies. As described in item 1 of the scope of patent application, the energy-saving vacuum unit for improving the vacuum of the condenser of a thermal power plant, wherein the at least one valve includes at least one of an automatic valve or a manual valve. As described in item 1 of the scope of patent application, the energy-saving vacuum unit used to improve the vacuum degree of the condenser of the thermal power plant, wherein each of the roots vacuum pumps is a two-blade or three-blade roots vacuum pump, or an air-cooled roots vacuum pump Vacuum pump. As described in item 1 of the scope of patent application, the energy-saving vacuum unit used to increase the vacuum of the condenser of a thermal power plant, wherein the backing pump is a vacuum pump that can directly exhaust the atmosphere. For example, the energy-saving vacuum unit used to increase the vacuum degree of the condenser of the thermal power plant as described in the first item of the patent application, wherein the backing pump is the water ring vacuum pump in the existing condenser vacuum maintenance system of the power plant, or the condenser The steam turbine vacuum is maintained by the liquid ring pump in the energy-saving vacuum unit, or the entire condenser vacuum is maintained by the energy-saving vacuum unit. As described in item 5 of the scope of patent application, the energy-saving vacuum unit for improving the vacuum degree of the condenser of a thermal power plant, wherein the exhaust port of the backing pump is connected to a steam-water separator, and the steam-water separator is used for the front The steam-water mixture output by the stage pump is separated into air and liquid water, where the air is discharged outward or enters the exhaust pipe of the vacuum system, and the liquid water is input into the bottom end of the steam-water separator, and by The loop fluid heat exchanger forms working water with a suitable water temperature and sends it back to the backing pump to serve as the working loop required for the operation of the backing pump. As described in item 2 of the scope of patent application, the energy-saving vacuum unit for improving the vacuum degree of the condenser of a thermal power plant, wherein each of the roots vacuum pumps is connected to a driving motor and a cooling mechanism, and the cooling mechanism is used to input cooling water To the roots vacuum pump for cooling. As described in item 7 of the scope of patent application, the energy-saving vacuum unit used to increase the vacuum degree of the condenser of the thermal power plant, wherein the roots vacuum pump is also equipped with a pressure transmitter and a temperature transmitter. The force transmitter is located at the entrance of the roots vacuum pump; the pressure transmitter is used to detect the pipeline pressure of the roots vacuum pump; the temperature transmitter is used to detect the temperature of the roots vacuum pump; the pressure is transmitted The device and the temperature transmitter are connected to a control mechanism, the control mechanism is connected to the drive motor and the cooling mechanism; the control mechanism receives the pressure value and temperature value detected by the pressure transmitter and the temperature transmitter , Control the drive motor and the cooling mechanism to protect the stable operation of the equipment; the pressure transmitter and the temperature transmitter transmit its detection value to the instrument; wherein the control mechanism is used to control the drive motor, and frequency conversion Ways to control the roots vacuum pump and adjust its performance according to the frequency conversion characteristics. As described in item 1 of the scope of patent application, the energy-saving vacuum unit for improving the vacuum degree of the condenser of the thermal power plant, in which a small-diameter return pipe is provided in front of the valve, which is connected to the vacuum main pipe and the destination of the return water In order to prevent the condensed water of the vacuum manifold from entering the vacuum pump. For example, the energy-saving vacuum unit used to increase the vacuum degree of the condenser of the thermal power plant as described in item 1 of the scope of patent application, wherein each of the conveying pipeline and the intake pipeline is equipped with an exhaust port cooler or a heat exchanger, In order to prevent the compressed gas of the previous stage of vacuum pump from generating too high temperature and affecting the safe operation of the next stage of vacuum pump.

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