Vacuumizing system for steam turbine condenser

Abstract

The utility model provides a vacuumizing system for a steam turbine condenser. The vacuumizing system comprises at least one conventional vacuumizing pump set and at least one auxiliary vacuumizing pump set. An air inlet of the conventional vacuumizing pump set and an air inlet of the auxiliary vacuumizing pump set are both connected with a vacuumizing connector of the condenser. According to the vacuum-pumping system for the steam turbine condenser, at least one conventional vacuum-pumping pump set and at least one auxiliary vacuum-pumping pump set are connected in parallel for use, and the auxiliary vacuum-pumping pump set can be efficiently and automatically controlled, so that the stability and the reliability of the vacuum state of the steam turbine condenser are realized; and the problem that the condenser cannot continuously work when the vacuumizing pump set is maintained and overhauled is also avoided.

Description

Technical Field

[0001] This utility model belongs to the field of steam turbines, and in particular relates to a vacuum system for steam turbine condensers. Background Technology

[0002] In practical use, steam turbine condensers require vacuuming. Under current technological conditions, steam turbine condensers are usually connected to only one set of vacuum pumps to achieve the vacuuming effect. When the vacuum pump set malfunctions, it will directly affect the operating status of the steam turbine condenser. At the same time, if maintenance or repair of the vacuum pump set is required, the operation of the steam turbine condenser must be stopped, which also affects the continuous operation of the condenser. Utility Model Content

[0003] In view of this, the present invention aims to overcome the defects in the prior art and propose a vacuum system for steam turbine condensers.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A vacuum pumping system for a steam turbine condenser includes at least one conventional vacuum pumping pump group and at least one auxiliary vacuum pumping pump group; the air inlet of the conventional vacuum pumping pump group and the air inlet of the auxiliary vacuum pumping pump group are both connected to the vacuum pumping interface of the condenser.

[0006] The auxiliary vacuum pump unit includes a vacuum pump, a buffer tank, and a control cabinet; the vacuum pump interface is connected to the air inlet of the vacuum pump via an electric ball valve, the air outlet of the vacuum pump is connected to the air inlet of the buffer tank, the water inlet of the vacuum pump is connected to the cooling water interface via a second filter, and the water outlet of the vacuum pump is connected to a flow switch; the air inlet of the vacuum pump is connected to a pressure sensor; and the vacuum pump is equipped with a temperature sensor for collecting the operating temperature of the vacuum pump.

[0007] The signal output terminals of the pressure sensor, temperature sensor, and flow switch are respectively connected to the signal acquisition input terminal of the control cabinet, and the control signal output terminal of the control cabinet is respectively connected to the control terminal of the electric ball valve and the start / stop control terminal of the vacuum pump.

[0008] In some embodiments of this utility model, the electric ball valve is connected to the air inlet of the vacuum pump through a first check valve.

[0009] In some embodiments of this utility model, the first check valve is connected to the air inlet of the vacuum pump through a first filter.

[0010] In some embodiments of this utility model, the purge gas inlet of the vacuum pump is connected to the nitrogen interface through a second check valve.

[0011] In some embodiments of this utility model, the purge gas outlet of the vacuum pump is connected to the inlet of the buffer tank through a third check valve.

[0012] In some embodiments of this invention, the buffer tank is connected to a drain valve.

[0013] In some embodiments of this utility model, the first filter is a bowl-type filter screen.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This utility model discloses a vacuum pumping system for a steam turbine condenser, including at least one conventional vacuum pumping pump group and at least one auxiliary vacuum pumping pump group. The inlets of both the conventional and auxiliary vacuum pumping pump groups are connected to the condenser's vacuum interface. During condenser startup and vacuum establishment, only the conventional vacuum pumping pump group is used to quickly establish the vacuum. Once the condenser is running normally, only the auxiliary vacuum pumping pump group is used to maintain the condenser's vacuum state. If the auxiliary vacuum pumping pump group malfunctions or requires maintenance, the conventional vacuum pumping pump group is restarted to maintain the condenser's vacuum state. This achieves stability and reliability of the condenser's vacuum state and avoids the problem of the condenser being unable to operate continuously during maintenance or repair of the vacuum pumping pump group. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram illustrating the principle of a vacuum system for a steam turbine condenser according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the auxiliary vacuum pump group structure for a vacuum system of a steam turbine condenser according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Condenser; 2-Conventional vacuum pump set; 3-Auxiliary vacuum pump set; 31-Electric ball valve; 32-First check valve; 33-First filter; 34-Vacuum pump; 35-Buffer tank; 36-Second check valve; 37-Third check valve; 38-Second filter; 39-Drain valve; 4-Control cabinet; 41-Pressure sensor; 42-Temperature sensor; 43-Flow switch. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In the description of this utility model, it should be further noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] Under current technological conditions, steam turbine condensers are typically connected to only one set of vacuum pumps to achieve the vacuuming effect. When the vacuum pump set malfunctions, it will directly affect the operating status of the steam turbine condenser. At the same time, if maintenance or repair of the vacuum pump set is required, the operation of the steam turbine condenser must be stopped, which also affects the continuous operation of the condenser.

[0027] like Figures 1 to 2 As shown, this utility model includes at least one conventional vacuum pump group 2 and at least one auxiliary vacuum pump group 3, which can be used in various application scenarios of condensers 1 using steam turbines.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] In one embodiment of this novel invention, such as Figures 1 to 2As shown, a vacuum system for a steam turbine condenser includes at least one conventional vacuum pump group 2 and at least one auxiliary vacuum pump group 3; the air inlet of the conventional vacuum pump group 2 and the air inlet of the auxiliary vacuum pump group 3 are both connected to the vacuum interface of the condenser 1.

[0030] The auxiliary vacuum pump assembly 3 includes a vacuum pump 34, a buffer tank 35, and a control cabinet 4; the vacuum interface is connected to the air inlet of the vacuum pump 34 via an electric ball valve 31, the air outlet of the vacuum pump 34 is connected to the air inlet of the buffer tank 35, the water inlet of the vacuum pump 34 is connected to the cooling water interface via a second filter 38, and the water outlet of the vacuum pump 34 is connected to a flow switch 43; the air inlet of the vacuum pump 34 is connected to a pressure sensor 41; and the vacuum pump 34 is equipped with a temperature sensor 42 for collecting the operating temperature of the vacuum pump 34.

[0031] The signal output terminals of pressure sensor 41, temperature sensor 42, and flow switch 43 are respectively connected to the signal acquisition input terminal of control cabinet 4. The control signal output terminals of control cabinet 4 are respectively connected to the control terminal of electric ball valve 31 and the start / stop control terminal of vacuum pump 34.

[0032] In this embodiment, the operator first turns on the conventional vacuum pump group 2 to evacuate the condenser 1. After the condenser 1 starts to vacuum, the conventional vacuum pump group 2 is turned off, and only the auxiliary vacuum pump group 3 is turned on to maintain the vacuum state of the condenser 1. When the auxiliary vacuum pump group 3 malfunctions, the conventional vacuum pump group 2 is turned on again to maintain the vacuum state of the condenser 1.

[0033] When the auxiliary vacuum pump group 3 maintains the vacuum state of the condenser 1, if it is necessary to shut down the auxiliary vacuum pump group 3 for maintenance, it can be turned on in advance and switched to the conventional vacuum pump group 2. The conventional vacuum pump group 2 can maintain the vacuum state of the condenser 1, ensuring that the continuous operation of the condenser 1 is not affected when the auxiliary vacuum pump group 3 is shut down for maintenance.

[0034] In this embodiment, as Figures 1 to 2 As shown, the control cabinet 4 is used to automatically control the auxiliary vacuum pump group 3. When the temperature sensor 42 detects that the operating temperature of the vacuum pump 34 is too high, or the flow switch 43 detects that the cooling water flowing out of the outlet of the vacuum pump 34 is too little, the control cabinet 4 controls the electric ball valve 31 and the vacuum pump 34 to shut down, so as to avoid damage to the vacuum pump 34.

[0035] In this embodiment, the control cabinet 4 can be a programmable controller or a central control unit.

[0036] Based on the previous embodiment, in another embodiment of this utility model, such as Figure 2As shown, the electric ball valve 31 is connected to the air inlet of the vacuum pump 34 through the first check valve 32.

[0037] In another embodiment of this utility model, such as Figure 2 As shown, the first check valve 32 is connected to the air inlet of the vacuum pump 34 through the first filter 33.

[0038] In this embodiment, the first filter 33 is used to filter impurities in the gas.

[0039] In another embodiment of this utility model, such as Figure 2 As shown, the purge gas inlet of the vacuum pump 34 is connected to the nitrogen interface through the second check valve 36.

[0040] In this embodiment, nitrogen gas is used to purge the interior of the vacuum pump 34.

[0041] In another embodiment of this utility model, such as Figure 2 As shown, the purge gas outlet of the vacuum pump 34 is connected to the inlet of the buffer tank 35 through the third check valve 37.

[0042] In this embodiment, as Figure 2 As shown, the buffer tank 35 is connected to the drain valve 39.

[0043] In this embodiment, as Figure 2 As shown, the first filter 33 is a bowl-type filter.

[0044] The embodiments of the present invention have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, various substitutions and modifications can be made by those skilled in the art, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A vacuum pumping system for a steam turbine condenser, characterized in that: It includes at least one conventional vacuum pump group (2) and at least one auxiliary vacuum pump group (3); the air inlet of the conventional vacuum pump group (2) and the air inlet of the auxiliary vacuum pump group (3) are both connected to the vacuum interface of the condenser (1); The auxiliary vacuum pump assembly (3) includes a vacuum pump (34), a buffer tank (35), and a control cabinet (4); the vacuum interface is connected to the air inlet of the vacuum pump (34) via an electric ball valve (31), the air outlet of the vacuum pump (34) is connected to the air inlet of the buffer tank (35), the water inlet of the vacuum pump (34) is connected to the cooling water interface via a second filter (38), and the water outlet of the vacuum pump (34) is connected to a flow switch (43); the air inlet of the vacuum pump (34) is connected to a pressure sensor (41); the vacuum pump (34) is equipped with a temperature sensor (42) for collecting the operating temperature of the vacuum pump (34); The signal output terminals of the pressure sensor (41), the temperature sensor (42), and the flow switch (43) are respectively connected to the signal acquisition input terminal of the control cabinet (4). The control signal output terminal of the control cabinet (4) is respectively connected to the control terminal of the electric ball valve (31) and the start / stop control terminal of the vacuum pump (34).

2. The vacuum system for a steam turbine condenser according to claim 1, characterized in that: The electric ball valve (31) is connected to the air inlet of the vacuum pump (34) via the first check valve (32).

3. A vacuum system for a steam turbine condenser according to claim 2, characterized in that: The first check valve (32) is connected to the air inlet of the vacuum pump (34) through the first filter (33).

4. A vacuum system for a steam turbine condenser according to claim 1, characterized in that: The purge gas inlet of the vacuum pump (34) is connected to the nitrogen interface through the second check valve (36).

5. A vacuum system for a steam turbine condenser according to claim 4, characterized in that: The purge gas outlet of the vacuum pump (34) is connected to the inlet of the buffer tank (35) via a third check valve (37).

6. A vacuum system for a steam turbine condenser according to claim 1, characterized in that: The buffer tank (35) is connected to the drain valve (39).

7. A vacuum system for a steam turbine condenser according to claim 3, characterized in that: The first filter (33) is a bowl-type filter.

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