System for reducing energy consumption of vacuumizing equipment of steam turbine generator

Abstract

The utility model relates to a system for reducing energy consumption of steam turbine generator vacuumizing equipment, which comprises two sets of vacuum units respectively connected with two steam turbine generator units sharing one machine room, and each set of vacuum unit comprises a vacuum unit A and a vacuum unit B which are arranged in parallel; wherein the vacuum unit A and the vacuum unit B are connected with vacuum systems of the two steam turbine generator units through air inlet pipelines. The system provided by the utility model is specially used for the situation that two steam turbine generator units share one machine room, so that the condensers of the two generator units can be kept vacuum by using one vacuum pump. In the initial stage of equipment starting or under the abnormal condition, the vacuumizing systems of the two steam turbine sets can be isolated. By means of the design, the sum of energy consumption of vacuumizing equipment of the two steam turbine generator units is greatly reduced.

Description

Technical Field

[0001] The utility model relates to a steam turbine generator vacuum pumping equipment technology, in particular to a system for reducing the energy consumption of the steam turbine generator vacuum pumping equipment. Background Art

[0002] Power plants generally use steam turbines to generate electricity, and condensers are heat exchangers that condense turbine exhaust steam into water. Condensers are mainly used in steam turbine power plants. During the power generation process, steam turbine generator sets need to be connected to a vacuum system. As a common device for evacuating steam turbine condensers in power plants, water ring vacuum pumps need to be configured with larger capacity due to the large amount of air pumped at the initial start-up of the unit and the need to maintain the condenser vacuum under abnormal conditions; however, when the generator set is operating normally, it is not necessary for the vacuum pumping equipment to operate at full output to maintain the vacuum of the unit. Therefore, there is a certain room for reducing the operating energy consumption of the steam turbine condenser vacuum pumping equipment, especially for the situation where two steam turbine generator sets share a machine room. At present, most of the two steam turbine generator sets that share a machine room have independent vacuum pumping systems.

[0003] How to design a vacuum system suitable for two steam turbine generator sets sharing a machine room and capable of reducing the energy consumption of their vacuum equipment has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0004] The utility model aims to solve the deficiencies of the prior art and provide a system which can be applied to two steam turbine generator sets sharing a machine room and can reduce the energy consumption of the steam turbine generator vacuum equipment.

[0005] The technical solution adopted by the utility model is: a system for reducing the energy consumption of steam turbine generator vacuum equipment, including two sets of vacuum units respectively connected to two steam turbine generator sets sharing a machine room, each set of vacuum units including a vacuum unit A and a vacuum unit B arranged in parallel; wherein,

[0006] The vacuum unit A and vacuum unit B are both connected to the vacuum systems of the two steam turbine generator sets through air intake pipelines;

[0007] The vacuum unit A and the vacuum unit B are both provided with a water ring vacuum pump and a gas-water separator. The water ring vacuum pump is connected to a chilled water replenishment pipeline. The chilled water in the chilled water replenishment pipeline is replenished into the gas-water separator and then enters the water ring vacuum pump through the chilled water circulation pipeline; the air in the air intake pipeline first enters the water ring vacuum pump and then is discharged through the gas-water separator.

[0008] Preferably, the air intake pipeline includes two intake pipelines A, two intake pipelines B and a generator set vacuum system connecting pipe, one end of each of the intake pipelines A is connected to the vacuum system of a steam turbine generator set, and the other end is connected to the vacuum unit A; one end of each of the intake pipelines B is connected to the vacuum system of a steam turbine generator set, and the other end is connected to the vacuum unit B; the generator set vacuum system connecting pipe connects the two intake pipelines B.

[0009] Preferably, a connecting valve for connecting the vacuum systems of two steam turbine units is provided on the connecting pipe of the vacuum system of the generator unit.

[0010] Preferably, the air intake pipeline A and the air intake pipeline B are both connected to an air intake pipe drain pipe.

[0011] Preferably, the chilled water circulation pipeline includes a vacuum pump chilled water inlet pipe, a vacuum pump chilled water outlet pipe, a separator chilled water inlet pipe and a separator chilled water return pipe. The chilled water enters the vacuum pump chilled water inlet pipe, the water ring vacuum pump, the vacuum pump chilled water outlet pipe, the separator chilled water inlet pipe, and the gas-water separator in sequence, and finally flows back to the vacuum pump chilled water inlet pipe through the separator chilled water return pipe.

[0012] Preferably, a heat exchanger is provided at the connection between the chilled water inlet pipe of the vacuum pump and the chilled water return pipe of the separator.

[0013] Preferably, the gas-water separators of the vacuum unit A and the vacuum unit B are connected to the chilled water replenishment pipeline.

[0014] Preferably, the chilled water make-up pipeline includes a make-up water main pipeline, one end of the make-up water main pipeline is connected to the vacuum pump closed water pipeline and the vacuum pump chilled water pipeline, and the other end is connected to the make-up water branch pipeline A and the make-up water branch pipeline B; the other end of the make-up water branch pipeline A is connected to the gas-water separator of the vacuum unit A, and the other end of the make-up water branch pipeline B is connected to the gas-water separator of the vacuum unit B.

[0015] Preferably, both the water supply branch pipeline A and the water supply branch pipeline B are provided with a pressure reducing valve and a water supply manual valve.

[0016] Preferably, the water ring vacuum pump and the gas-water separator are both connected to a system drainage pipeline.

[0017] Preferably, the top of the gas-water separator is connected to an exhaust pipeline.

[0018] Preferably, the two steam turbine generator sets are respectively steam turbine generator set No. 1 and steam turbine generator set No. 2.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. The system of the utility model is specially designed for the situation where two steam turbine generator sets share one machine room. By flexibly transforming the vacuum pipeline system, it can use one vacuum pump to maintain the condenser vacuum of the two generator sets, thereby saving the energy consumption of the vacuum equipment and exploring the energy-saving potential of the vacuum system equipment. When the equipment is initially started or under abnormal conditions, the vacuum systems of the two steam turbine sets can be isolated. This design greatly reduces the total energy consumption of the vacuum equipment of the two steam turbine generator sets.

[0021] 2. The system of the utility model uses a set of chilled water replenishment pipelines to replenish the chilled water of the working fluid of the water ring vacuum pumps of vacuum unit A and vacuum unit B. The chilled water replenishment pipeline can meet the needs of two water ring vacuum pumps at the same time, and can also replenish the working fluid chilled water of only one water ring vacuum pump as needed. The operation is flexible and convenient, and energy consumption is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the process of the utility model.

[0023] Figure 2 This is a flow chart of one of the vacuum units.

[0024] The numbers in the figure show:

[0025] 01-No. 1 steam turbine generator set, 02-No. 2 steam turbine generator set, 1-Vacuum unit A, 2-Vacuum unit B, 3-Air intake pipeline, 31-Intake pipeline A, 32-Intake pipeline B, 33-Generator vacuum system connecting pipe, 34-Intake valve, 35-Connecting valve, 36-Intake pipe drain pipe, 4-Water ring vacuum pump, 5-Air-water separator, 6-Chilled water circulation pipeline, 61-Vacuum pump chilled water inlet Water pipe, 62-vacuum pump chilled water outlet pipe, 63-separator chilled water inlet pipe, 64-separator chilled water return pipe, 65-heat exchanger, 7-chilled water make-up pipeline, 71-make-up main pipeline, 72-vacuum pump closed water pipeline, 73-vacuum pump chilled water pipeline, 74-make-up branch pipeline A, 75-make-up branch pipeline B, 76-pressure reducing valve, 77-make-up manual valve, 8-system drain pipeline, 9-exhaust pipeline. DETAILED DESCRIPTION

[0026] In order to deepen the understanding of the utility model, the utility model will be further described in detail below with reference to implementation cases and drawings. The utility model can be implemented in the following ways:

[0027] Reference Figure 1-2, a system for reducing the energy consumption of steam turbine generator vacuum equipment, including two sets of vacuum units connected to two steam turbine generator sets sharing a machine room, each set of vacuum units including vacuum unit A1 and vacuum unit B2 arranged in parallel. When vacuum unit A1 is running, vacuum unit B2 is in standby state; when vacuum unit A1 fails, vacuum unit B2 is immediately started to maintain the vacuum state of the steam turbine generator set, thereby improving the safety performance of the entire system.

[0028] Specifically, the vacuum unit A1 and the vacuum unit B2 are both connected to the vacuum systems of the two steam turbine generator sets through the air intake pipeline 3. The two steam turbine generator sets described in this embodiment are respectively the No. 1 steam turbine generator set 01 and the No. 2 steam turbine generator set 02. The vacuum unit A1 and the vacuum unit B2 are both provided with a water ring vacuum pump 4 and a gas-water separator 5. The water ring vacuum pump 4 is connected to a chilled water replenishment pipeline 7, and the chilled water in the chilled water replenishment pipeline 7 is replenished into the gas-water separator 5, and then enters the water ring vacuum pump 4 through the chilled water circulation pipeline 6; the air in the air intake pipeline 3 first enters the water ring vacuum pump 4, and then is discharged through the gas-water separator 5.

[0029] Specifically, the air intake pipeline 3 includes two intake pipelines A31, two intake pipelines B32 and a generator set vacuum system connecting pipe 33. One end of each intake pipeline A31 is connected to the vacuum system of a steam turbine generator set, and the other end is connected to the vacuum unit A1; one end of the intake pipeline B32 is connected to the vacuum system of a steam turbine generator set, and the other end is connected to the vacuum unit B2; intake valves 34 are provided on the intake pipelines A31 and B32. The intake pipelines A31 and B32 are both connected to an intake pipe drain pipe 36. The generator set vacuum system connecting pipe 33 connects the two intake pipelines B32. The generator set vacuum system connecting pipe 33 is provided with a connecting valve 35 connecting the vacuum systems of the two steam turbine sets. The connecting valve 35 is used to connect the vacuum systems of the two steam turbine sets, and is used to isolate the vacuum pumping systems of the two steam turbine sets under abnormal conditions. At the initial start-up of the equipment or under abnormal circumstances, the connecting valve 35 is in a closed state, and the vacuum unit A1 or the vacuum unit B2 of the two vacuum units are separately connected to the No. 1 steam turbine generator unit 01 and the No. 2 steam turbine generator unit 02; when the No. 1 steam turbine generator unit 01 and the No. 2 steam turbine generator unit 02 enter normal operating conditions, the connecting valve 35 of the generator unit vacuum system connecting pipe 33 is opened, and then one of the vacuum units is closed, and then the corresponding vacuum unit with the air intake valve 34 not closed is used to maintain the vacuum operation of the two steam turbine generator units, thereby achieving the effect of saving energy consumption of the vacuum equipment.

[0030] The chilled water circulation pipeline 6 includes a vacuum pump chilled water inlet pipe 61, a vacuum pump chilled water outlet pipe 62, a separator chilled water inlet pipe 63 and a separator chilled water return pipe 64. The chilled water enters the vacuum pump chilled water inlet pipe 61, the water ring vacuum pump 4, the vacuum pump chilled water outlet pipe 62, the separator chilled water inlet pipe 63, and the gas-water separator 5 in sequence, and finally flows back to the vacuum pump chilled water inlet pipe 61 through the separator chilled water return pipe 64 to form a closed loop. A heat exchanger 65 is provided at the connection between the vacuum pump chilled water inlet pipe 61 and the separator chilled water return pipe 64 to cool the circulating working fluid of the water ring vacuum pump. When the amount of chilled water in the vacuum unit is insufficient, the float valve corresponding to 74-water supply branch pipe A or 75-water supply branch pipe B automatically opens to replenish the chilled water in the vacuum unit.

[0031] The gas-water separator 5 of the vacuum unit A1 and the vacuum unit B2 is also connected to a chilled water supply pipeline 7. The chilled water supply pipeline 7 includes a water supply main pipeline 71, one end of which is connected to the vacuum pump closed water pipeline 72 and the vacuum pump chilled water pipeline 73, and the other end is connected to the water supply branch pipeline A74 and the water supply branch pipeline B75; the other end of the water supply branch pipeline A74 is connected to the gas-water separator 5 of the vacuum unit A1, and the other end of the water supply branch pipeline B75 is connected to the gas-water separator 5 of the vacuum unit B2. A pressure reducing valve 76 and a water supply manual valve 77 are provided on the water supply branch pipeline A74 and the water supply branch pipeline B75.

[0032] The water ring vacuum pump 4 and the gas-water separator 5 are both connected to a system drainage pipeline 8. When the two steam turbine generator sets stop running or the two vacuum units need to be repaired, the chilled water in the vacuum units can be discharged through the system drainage pipeline 8. The top of the gas-water separator 5 is connected to an exhaust pipeline 9. The gas extracted by the water ring vacuum pump 4 first enters the gas-water separator 5 and is finally discharged through the exhaust pipeline 9. All pipelines in this embodiment are also provided with corresponding valves, which will not be elaborated here.

[0033] Working principle: When the two steam turbine generator sets are initially started, the connecting valve 35 on the connecting pipe 33 of the vacuum system of the generator sets is in a closed state, and the two steam turbine generator sets operate independently, and the vacuum unit A1 or vacuum unit B2 of each vacuum unit is connected to the vacuum system of one of the steam turbine generator sets; when the No. 1 steam turbine generator set and the No. 2 steam turbine generator set enter a normal operating state, the connecting valve 35 of the connecting pipe 33 of the vacuum system of the generator set is opened, and then the air intake valve 34 on the air intake pipeline A31 or air intake pipeline B32 of one of the steam turbine generator sets is closed, and then the corresponding vacuum unit A1 or vacuum unit B2 whose air intake valve 34 is not closed is used to maintain the vacuum pumping operation of the two steam turbine generator sets; when an abnormal situation occurs in the steam turbine generator set, the closed vacuum unit is immediately started, and the connecting valve 35 on the connecting pipe 33 of the vacuum system of the generator set is closed, so that the vacuum pumping systems of the two steam turbine generator sets are isolated from each other.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A system for reducing energy consumption of a steam turbine generator vacuum pumping device, characterized in that: The invention comprises two sets of vacuum units respectively connected to two steam turbine generator sets sharing a common machine room, each set of vacuum units comprising a vacuum unit A (1) and a vacuum unit B (2) arranged in parallel; wherein: The vacuum unit A (1) and the vacuum unit B (2) are both connected to the vacuum systems of the two steam turbine generator sets through an air intake pipeline (3); The vacuum unit A (1) and the vacuum unit B (2) are both provided with a water ring vacuum pump (4) and a gas-water separator (5). The water ring vacuum pump (4) is connected to a chilled water supply pipeline (7). The chilled water in the chilled water supply pipeline (7) is replenished and enters the gas-water separator (5), and then enters the water ring vacuum pump (4) through the chilled water circulation pipeline (6); the air in the air intake pipeline (3) first enters the water ring vacuum pump (4), and then is discharged through the gas-water separator (5).

2. A system for reducing energy consumption of a steam turbine generator vacuum equipment according to claim 1, characterized in that: The air intake pipeline (3) comprises two intake pipelines A (31), two intake pipelines B (32) and a generator set vacuum system connecting pipe (33), one end of each intake pipeline A (31) is connected to the vacuum system of a steam turbine generator set, and the other end is connected to the vacuum unit A (1); one end of each intake pipeline B (32) is connected to the vacuum system of a steam turbine generator set, and the other end is connected to the vacuum unit B (2); the generator set vacuum system connecting pipe (33) connects the two intake pipelines B (32).

3. A system for reducing energy consumption of a steam turbine generator vacuum pumping device according to claim 2, characterized in that: The generator set vacuum system connecting pipe (33) is provided with a connecting valve (35) for connecting the vacuum systems of the two steam turbine sets.

4. A system for reducing energy consumption of a steam turbine generator vacuum pumping device according to claim 3, characterized in that: The air intake pipeline A (31) and the air intake pipeline B (32) are both connected to an air intake pipe drain pipe (36).

5. A system for reducing energy consumption of a steam turbine generator vacuum equipment according to any one of claims 1 to 4, characterized in that: The chilled water circulation pipeline (6) comprises a vacuum pump chilled water inlet pipe (61), a vacuum pump chilled water outlet pipe (62), a separator chilled water inlet pipe (63) and a separator chilled water return pipe (64). The chilled water sequentially enters the vacuum pump chilled water inlet pipe (61), the water ring vacuum pump (4), the vacuum pump chilled water outlet pipe (62), the separator chilled water inlet pipe (63), and the gas-water separator (5), and finally flows back to the vacuum pump chilled water inlet pipe (61) through the separator chilled water return pipe (64).

6. A system for reducing energy consumption of a steam turbine generator vacuum equipment according to any one of claims 1 to 4, characterized in that: The gas-water separators (5) of the vacuum unit A (1) and the vacuum unit B (2) are connected to the chilled water replenishment pipeline (7).

7. A system for reducing energy consumption of a steam turbine generator vacuum equipment according to claim 6, characterized in that: The chilled water replenishment pipeline (7) comprises a replenishment main pipeline (71), one end of the replenishment main pipeline (71) is connected to the vacuum pump closed water pipeline (72) and the vacuum pump chilled water pipeline (73), and the other end is connected to a replenishment branch pipeline A (74) and a replenishment branch pipeline B (75); the other end of the replenishment branch pipeline A (74) is connected to the gas-water separator (5) of the vacuum unit A (1), and the other end of the replenishment branch pipeline B (75) is connected to the gas-water separator (5) of the vacuum unit B (2).

8. A system for reducing energy consumption of a steam turbine generator vacuum pumping device according to claim 7, characterized in that: The water supply branch pipeline A (74) and the water supply branch pipeline B (75) are both provided with a pressure reducing valve (76) and a water supply manual valve (77).

9. A system for reducing energy consumption of a steam turbine generator vacuum pumping device according to claim 1 or 2 or 3 or 4 or 7 or 8, characterized in that: The water ring vacuum pump (4) and the gas-water separator (5) are both connected to a system drainage pipeline (8).

10. A system for reducing energy consumption of a steam turbine generator vacuum pumping device according to claim 1 or 2 or 3 or 4 or 7 or 8, characterized in that: The top of the gas-water separator (5) is connected to an exhaust pipeline (9).

Images