TWI815068B - Vacuum system based on condenser and Roots vacuum pump - Google Patents

Abstract

A vacuum system based on a condenser and a Roots vacuum pump, including an inlet condenser and an input end for receiving steam input from an external air-cooled generator set, and condensing the condensable gas in the steam, and Output the remaining gas to the outside; a Roots vacuum pump group, including at least one Roots vacuum pump; the Roots vacuum pump group also includes an input end and an output end, the input end is connected to the inlet condenser; the inlet condenser is The output gas system is input into the at least one Roots vacuum pump through the input end for compression, and then output from the output end; and a backing pump, the output end of the Roots vacuum pump set is connected to the Roots vacuum pump through an output pipeline. A backing pump is used to receive the gas output from the Roots vacuum pump unit.

Description

Vacuum system based on condenser and Roots vacuum pump

The present invention relates to a vacuum system, especially a vacuum system based on a condenser and a Roots vacuum pump.

Currently in power plants, generator sets can be divided into water-cooled generator sets and air-cooled generator sets. The air-cooling type of air-cooled generator sets can be divided into direct air-cooled and indirect air-cooled. Indirect air-cooled generator sets have Condenser, while direct air-cooled generator sets do not have a condenser. Air-cooled generator sets need to operate in a vacuum state, so a vacuum maintenance system is required to create a vacuum state. Among them, the vacuum maintenance system of air-cooled generator sets usually uses a liquid ring vacuum pump system, and the liquid ring vacuum pump is used to meet the requirements of maintaining vacuum.

However, the liquid ring vacuum pump system of the air-cooled generator set in the above-mentioned conventional technology mainly uses a single liquid ring vacuum pump, which requires a relatively high power consumption and a considerable amount of water. Moreover, the liquid ring vacuum pump system is bulky and needs to occupy a large area. In addition, the liquid ring vacuum pump makes a lot of noise when used, and the maintenance cost is also quite high. Therefore, its use in power plants has the disadvantage of taking up a lot of space and requiring high costs.

Furthermore, when the vacuum degree of the liquid ring vacuum pump used in most power plants gradually increases, its pumping capacity will begin to decrease and cavitation will occur. Especially when the temperature is high in summer, the liquid ring vacuum pump is more prone to cavitation, which greatly reduces its pumping capacity and reduces the vacuum of the air-cooled generator set. The deterioration of the condition will further reduce the efficiency of the turbine of the generating unit, thus leading to an increase in coal consumption for power generation.

Therefore, this case hopes to propose a brand new vacuum system based on a condenser and Roots vacuum pump to solve the above-mentioned shortcomings of the previous technology.

Therefore, the purpose of the present invention is to solve the above-mentioned problems in the conventional technology. The present invention proposes a vacuum system based on a condenser and a Roots vacuum pump. The condenser, Roots vacuum pump and backing pump are used to form a vacuum system, which can As a vacuum maintenance system for air-cooled generators in power plants, the structure of this case can greatly reduce the power and water consumption of the vacuum maintenance system of air-cooled generators in power plants, and the condensed water can be recycled and reused through the liquid collecting tank. Therefore, the system in this case can not only reduce the energy consumption of the power plant system, but also reduce the overall maintenance cost. It can also save water resources and achieve environmental protection purposes, which is something that conventional technologies cannot achieve.

In order to achieve the above object, the present invention proposes a vacuum system based on a condenser and a Roots vacuum pump, including an inlet condenser and an input end for receiving steam input from an external air-cooled generator set, and converting the steam into The condensable gas is condensed and the remaining gas is output outward; a Roots vacuum pump unit includes at least one Roots vacuum pump; the Roots vacuum pump unit further includes an input end and an output end, and the input end is connected to the inlet Condenser; the gas system output by the inlet condenser is input into at least one Roots vacuum pump through the input end for compression, and then output from the output end; and a backing pump, the output of the Roots vacuum pump unit The backing pump is connected to the backing pump through an output pipeline, and the backing pump is used to receive the gas output from the Roots vacuum pump set.

The features and advantages of the present invention can be further understood from the following description. Please refer to the accompanying drawings when reading.

1: Air-cooled generator set

10:Inlet condenser

11:Input terminal

20: Liquid collection tank

30:Roots vacuum pump set

31:Input terminal

32:Output terminal

33:Output pipeline

40:Roots vacuum pump

41:Gas pipeline

45:First motor mechanism

50: Backing pump

55: Second motor mechanism

60:Heat exchanger

70:Rack

80: Bellows

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

Figure 2 shows another component assembly schematic diagram of this case.

Figure 3 shows another schematic diagram of component combination in this case.

Hereby, we would like to give a detailed description of the structural composition of this case, as well as the functions and advantages it can produce, together with the drawings, and give a detailed description of one of the preferred embodiments of this case as follows.

Please refer to Figures 1 to 3, which show the vacuum system based on the condenser and Roots vacuum pump of the present invention, which includes the following components:

An inlet condenser 10 includes an input end 11 for receiving steam input from the external air-cooled generator set 1, condensing the condensable gas in the steam, and outputting the remaining gas to the outside; wherein the After the condensable gas in the steam is condensed through the inlet condenser 10, the volume of the steam will be reduced, thereby reducing the amount of gas required to enter the rear-end assembly. The input end 11 of the inlet condenser 10 can withstand a pressure greater than ten thousand Pa (Pascal), preferably tens of thousands Pa (Pascal). The inlet condenser 10 can be any type of condenser. The air-cooled generator set 1 may be an indirect air-cooled generator set with a condenser, or a direct air-cooled generator set without a condenser.

The inlet condenser 10 is connected to a liquid collecting tank 20 . The liquid collecting tank 20 is used to collect condensed liquid (such as water) produced after condensation of the condensable gas in the inlet condenser 10 . The condensed liquid can be recycled. use. The liquid collection tank 20 can be any type of collection tank that can collect liquid in a vacuum state.

A Roots vacuum pump unit 30 includes at least one Roots vacuum pump 40; the Roots vacuum pump unit 30 also includes an input end 31 and an output end 32, and the input end 31 is connected to the inlet condenser 10; the inlet condenser 10 is The output gas system is input into the at least one Roots vacuum pump 40 through the input port 31 for compression, and then is output from the output port 32 . Each Roots vacuum pump 40 can be any form of Roots vacuum pump 40, preferably a Roots vacuum pump 40 that can withstand a large pressure difference of ten thousand or tens of thousands Pa (Pascal), such as a two-blade Roots vacuum pump, a three-blade Roots vacuum pump, and a Roots vacuum pump. Leaf-type Roots vacuum pump, air-cooled Roots vacuum pump, or multi-stage Roots vacuum pump.

Each Roots vacuum pump 40 is connected to a first motor mechanism 45 for driving the corresponding Roots vacuum pump 40 .

As shown in FIG. 1 , the at least one Roots vacuum pump 40 of the Roots vacuum pump group 30 is a single Roots vacuum pump 40 .

As shown in FIG. 2 , the at least one Roots vacuum pump 40 of the Roots vacuum pump unit 30 is a plurality of Roots vacuum pumps 40 , and the plurality of Roots vacuum pumps 40 are connected in series. The gas system output by the inlet condenser 10 Multi-stage compression is performed by the plurality of Roots vacuum pumps 40 in sequence. Gas pipelines 41 should be used to connect two adjacent Roots vacuum pumps 40 in series.

The at least one Roots vacuum pump 40 includes one Roots vacuum pump 40 or multiple Roots vacuum pumps 40 that can be used to share the pressure difference, so that the installed power of the overall system can be reduced and water consumption can be reduced.

A backing pump 50 , the output end 32 of the Roots vacuum pump set 30 is connected to the backing pump 50 via the output pipeline 33 , and the backing pump 50 is used to receive the gas output from the Roots vacuum pump set 30 . The backing pump 50 is preferably a vacuum pump that can directly discharge the atmosphere, such as a liquid ring pump, a steam jet pump, an atmospheric jet pump, or a water flush pump.

The backing pump 50 is connected to a second motor mechanism 55 for driving the backing pump 50 .

Using the above structure, the gas from the inlet condenser 10 is compressed through the Roots vacuum pump group 30, so that the gas volume is reduced, so the amount of gas that the backing pump 50 needs to pump can be reduced. When the input gas pressure of the Roots vacuum pump 40 in the Roots vacuum pump group 30 is greater than a specific value, the backing pump 50 does not need to operate at this time, and the gas output by the Roots vacuum pump group 30 is directly supplied from the front line. The internal part of the backing pump 50 is discharged to the outside. Since the backing pump 50 does not operate, the purpose of energy saving can be achieved.

A heat exchanger 60 is connected in series to the output pipeline 33 . The heat exchanger 60 is used to cool the overflow gas output by the Roots vacuum pump unit 30 and input the cooled gas to the backing pump 50 . The heat exchanger 60 can be any form of heat exchanger 60 .

A bellows 80 can be connected in series to the output pipeline 33 so that the output pipeline 33 can remain sealed.

As shown in FIG. 3 , this case further includes a frame 70 connected to the Roots vacuum pump set 30 and the backing pump 50 . The frame 70 is used to support the Roots vacuum pump set 30 and the backing pump 50 . Preferably, the frame 70 includes steel weldments.

The advantage of this case is that the condenser, Roots vacuum pump and backing pump are used to form a vacuum system, which can be used as the vacuum maintenance system of the air-cooled generator set in the power plant. The structure of this case can greatly reduce the cost of the vacuum maintenance system of the air-cooled generator set in the power plant. The power consumption and water consumption are reduced, and the condensate water can be recycled and reused through the liquid collecting tank. Therefore, the system in this case can not only reduce the energy consumption of the power plant system, but also reduce the overall maintenance cost. It can also save water resources and achieve environmental protection purposes, which is something that conventional technologies cannot achieve.

To sum up, the humanized and considerate design of this case is quite in line with actual needs. Its specific improvement has the existing deficiencies, and it has obvious breakthrough advantages compared to the conventional technology, and it does have an improvement in efficacy, and it is not easy to achieve. This case has not been published or disclosed in domestic or foreign documents or markets, and it complies with the provisions of the patent law.

The above detailed description is a specific description of one possible embodiment of the present invention. However, this embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the technical spirit of the present invention shall be included in within the scope of the patent in this case.

1: Air-cooled generator set

10:Inlet condenser

11:Input terminal

20: Liquid collection tank

30:Roots vacuum pump set

31:Input terminal

32:Output terminal

33:Output pipeline

40:Roots vacuum pump

45:Motor mechanism

50: Backing pump

55:Motor mechanism

60:Heat exchanger

80: Bellows

Claims (12)

An air-cooled power generation system of a power plant with a vacuum system of a condenser and a Roots vacuum pump, including: an air-cooled generator set; an inlet condenser, including an input end connected to the air-cooled generator set, and the inlet condenser is used to receive from the air-cooled generator set. The steam input by the air-cooled generator set is condensed to condense the condensable gas in the steam, so that the volume of the steam is reduced, and the remaining gas is output outward; a Roots vacuum pump unit, including at least one Roots vacuum pump ; The Roots vacuum pump unit further includes an input end and an output end, the input end is connected to the inlet condenser; the gas system output by the inlet condenser is input into the at least one Roots vacuum pump for compression through the input end, Then output from the output end; and a backing pump, the output end of the Roots vacuum pump set is connected to the backing pump through the output pipeline, the backing pump is used to receive the output from the Roots vacuum pump set Gas; wherein the backing pump is selected from a liquid ring pump, a steam jet pump, an atmospheric jet pump, and a water flush pump. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, the inlet condenser is connected to a liquid collecting tank, and the liquid collecting tank is used to collect the condensation generated after the condensable gas in the inlet condenser is condensed. liquid for recycling. For example, in the air-cooled power generation system of a power plant described in item 2 of the patent application, the liquid collection tank is a collection tank that can collect liquid in a vacuum state. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, the input end of the inlet condenser can withstand a pressure greater than 10,000 Pa (Pascal). The air-cooled power generation system of a power plant described in item 1 of the patent application also includes a heat exchanger connected in series to the output pipeline. The heat exchanger is used to cool the overflow air output by the Roots vacuum pump unit. body, and input the cooled gas to the backing pump. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, each of the Roots vacuum pumps is a Roots vacuum pump that can withstand a pressure difference of ten thousand or tens of thousands Pa (Pascal). For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, each of the Roots vacuum pumps is selected from the group consisting of two-leaf Roots vacuum pumps, three-leaf Roots vacuum pumps, and air-cooled Roots vacuum pumps. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, each Roots vacuum pump is connected to a first motor mechanism for driving the corresponding Roots vacuum pump; the backing pump is connected to a second motor mechanism , used to drive the backing pump. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, the at least one Roots vacuum pump of the Roots vacuum pump unit is a single Roots vacuum pump. The air-cooled power generation system of a power plant as described in item 1 of the patent application, wherein the at least one Roots vacuum pump of the Roots vacuum pump unit is a plurality of Roots vacuum pumps, and the plurality of Roots vacuum pumps are connected in series, and the inlet condenses The gas system output by the device sequentially undergoes multi-stage compression through the multiple Roots vacuum pumps; gas pipelines should be connected in series between two adjacent Roots vacuum pumps. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, when the input gas pressure of the Roots vacuum pump in the Roots vacuum pump unit is greater than a specific value, the backing pump does not operate at this time, and the The gas output by the Roots vacuum pump unit directly passes through the interior of the backing pump and is discharged outward. For example, in the air-cooled power generation system of a power plant described in item 1 of the patent application, a corrugated pipe is connected in series to the output pipeline to keep the output pipeline sealed.

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