Steam turbine generator condenser vacuum system

Abstract

The utility model discloses a steam turbine generator condenser vacuum system, which belongs to the field of power generation, and is characterized in that vacuum systems of two or more units of the same centralized control unit are connected through a pipeline, an electric isolating valve and a pneumatic quick-closing valve, so that one vacuum pump drives the two units to operate under the condition of low load or lower environment temperature; and the purpose of saving energy is achieved. The system mainly comprises a plurality of generator sets, each generator set is connected with a plurality of vacuum pump sets through a manual valve, the system further comprises an electric isolation valve I and an electric isolation valve II, the electric isolation valve I is connected between the manual valve and the vacuum pump set of one generator set, and the electric isolation valve II is connected with the vacuum pump set of the other generator set. The electric isolating valve II is connected between the manual valve of the other generator set and the vacuum pump set, and a pneumatic quick-closing valve is connected between the electric isolating valve I and the electric isolating valve II. The utility model is mainly used for the generator condenser vacuum system.

Description

Technical Field

[0001] The utility model relates to the field of power generation, and particularly to a vacuum system for a condenser of a steam turbine generator. Background Art

[0002] The vacuum system of a steam turbine generator set in a thermal power plant mainly consists of a condenser, a vacuum pump, a condensate pump, a circulating water pump, and connecting pipelines, etc. Generally, a unit is equipped with 2 or 3 vacuum pumps (with a power of 100KW) to establish vacuum in the system before unit startup and continuously extract a small amount of air or non-condensable gas during unit operation. The vacuum pump is designed according to the requirement of establishing vacuum within 30 minutes before startup. Since the vacuum is established by the circulating water cooling the exhaust steam during normal unit operation, and the vacuum pump is only used to suck the non-condensable gas in the condenser, if a 100KW vacuum pump still runs, there will inevitably be a waste situation. Currently, the industry mainly adopts the scheme of small vacuum pumps or Roots pumps. For example, a multi-stage dry Roots vacuum pump double-backpressure condenser vacuum extraction system and method with the publication number CN109237959A replaces it with a small pump or a gas extraction device with low energy consumption, and the recovery cost performance of the new equipment investment is also very low. Summary of the Invention

[0003] The purpose of the utility model is to provide a vacuum system for a condenser of a steam turbine generator. The vacuum systems of two or more units in the same centralized control unit are connected through pipelines, electric isolation valves, and pneumatic quick shut-off valves to achieve the operation of one vacuum pump driving two units under low load or low ambient temperature conditions, so as to achieve the purpose of energy conservation.

[0004] The utility model is realized through the following technical solutions:

[0005] A vacuum system for a condenser of a steam turbine generator includes several generator sets. Each generator set is connected with several vacuum pump groups through manual valves, and also includes an electric isolation valve I and an electric isolation valve II. The electric isolation valve I is connected between the manual valve of a group of generator sets and the vacuum pump group, and the electric isolation valve II is connected between the manual valve of another group of generator sets and the vacuum pump group. A pneumatic quick shut-off valve is connected between the electric isolation valve I and the electric isolation valve II.

[0006] Further, each of the several vacuum pump groups includes a vacuum pump electric valve and a vacuum pump. The manual valve is connected to the vacuum pump electric valve, and the vacuum pump electric valve is connected to the vacuum pump.

[0007] Further, both of the two generator sets are connected with a cooling tower and several circulating water pumps.

[0008] Further, both of the two generator sets are connected with several condensate pump groups, and the several condensate pump groups are connected to a deaerator through deaeration valves.

[0009] Furthermore, each of the condensate pump sets includes an inlet valve, a condensate pump, and a secondary valve set. The inlet valves are respectively connected to the generator sets and the condensate pumps. The condensate pumps are connected to the secondary valve set, and the secondary valve set is connected to the deaeration valves.

[0010] Furthermore, the secondary valve set includes a check valve and an outlet valve. The condensate pump is connected to the check valve, the check valve is connected to the outlet valve, and the outlet valve is connected to the deaeration valves.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The vacuum systems of two or more generator sets in the same centralized control unit are connected through pipelines, electric isolation valves, and pneumatic quick closing valves, enabling one vacuum pump to operate two generator sets under low load or low ambient temperature conditions, achieving the purpose of energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the system schematic diagram of the present utility model.

[0014] In the figure: 1. Generator set; 2. Manual valve; 3. Inlet valve; 4. Condensate pump; 5. Check valve; 6. Deaerator; 7. Outlet valve; 8. Deaeration valve; 9. Circulating water pump; 10. Cooling tower; 11. Vacuum pump; 12. Vacuum pump electric valve; 13. Electric isolation valve II; 14. Electric isolation valve I; 15. Pneumatic quick closing valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present utility model will be further described below in conjunction with the accompanying drawings.

[0016] As Figure 1 shown, Embodiment 1: A steam turbine generator condenser vacuum system includes several groups of generator sets 1. Each group of generator sets 1 is connected to several vacuum pump sets through manual valves 2. It also includes an electric isolation valve I 14 and an electric isolation valve II 13. The electric isolation valve I 14 is connected between the manual valve 2 of a group of generator sets 1 and the vacuum pump sets, and the electric isolation valve II 13 is connected between the manual valve 2 of another group of generator sets 1 and the vacuum pump sets. A pneumatic quick closing valve 15 is connected between the electric isolation valve I 14 and the electric isolation valve II 13.

[0017] Embodiment 2. A steam turbine generator condenser vacuum system. Each of the several vacuum pump sets includes a vacuum pump motorized valve 12 and a vacuum pump 11. A manual valve 2 is connected to the vacuum pump motorized valve 12, and the vacuum pump motorized valve 12 is connected to the vacuum pump 11. Each of the generator sets 1 is connected to a cooling tower 10 and several circulating water pumps 9. Each of the generator sets 1 is connected to several condensate pump sets, and the several condensate pump sets are connected to a deaerator 6 through deaeration valves 8. Each of the condensate pump sets includes an inlet valve 3, a condensate pump 4, and a secondary valve group. The inlet valve 3 is respectively connected to the generator set 1 and the condensate pump 4. The condensate pump 4 is connected to the secondary valve group, and the secondary valve group is connected to the deaeration valve 8. The secondary valve group includes a check valve 5 and an outlet valve 7. The condensate pump 4 is connected to the check valve 5, the check valve 5 is connected to the outlet valve 7, and the outlet valve 7 is connected to the deaeration valve 8. The rest is the same as that in Embodiment 1.

[0018] After the system transformation, each electric isolation valve and pneumatic quick closing valve 15 can be opened, and the vacuum systems can be paralleled through the connecting pipelines. One of the vacuum pumps 11 in two generator sets 1 is shut down, so that one vacuum pump 11 operates for the two units, and 1 or 2 of the three standby vacuum pumps are put into the interlock state as required. During the normal operation of the unit, when one vacuum pump 11 trips, 1 or 2 standby vacuum pumps 11 are interlocked and started according to the situation of standby interlock input. During the normal operation of the unit, when one unit trips, the electric isolation valves and pneumatic quick closing valves 15 are interlocked and closed to achieve reliable isolation between the tripped unit and the operating unit. The operating generator set starts the standby vacuum pump through the low vacuum interlock to ensure the safe and stable operation of the unit. The secondary valve group can improve the reliability and safety of the whole system. The working principles of the rest are the prior arts and will not be elaborated.

Claims

1. A vacuum system for a condenser of a steam turbine generator, comprising several groups of generator sets (1), and each group of generator sets (1) is connected to several vacuum pump sets through a manual valve (2), characterized in that: It also includes an electric isolation valve I (14) and an electric isolation valve II (13). The electric isolation valve I (14) is connected between the manual valve (2) of a set of generator sets (1) and the vacuum pump set, and the electric isolation valve II (13) is connected between the manual valve (2) of another set of generator sets (1) and the vacuum pump set. An air-operated quick shut-off valve (15) is connected between the electric isolation valve I (14) and the electric isolation valve II (13).

2. The steam turbine generator condenser vacuum system according to claim 1, wherein: Each of the several vacuum pump sets includes a vacuum pump motorized valve (12) and a vacuum pump (11). The manual valve (2) is connected to the vacuum pump motorized valve (12), and the vacuum pump motorized valve (12) is connected to the vacuum pump (11).

3. The steam turbine generator condenser vacuum system according to claim 1, characterized in that: Each of the generator sets (1) is connected to a cooling tower (10) and several circulating water pumps (9).

4. The steam turbine generator condenser vacuum system according to claim 1, wherein: Each of the generator sets (1) is connected to several condensate pump sets, and the several condensate pump sets are connected to a deaerator (6) through deaeration valves (8).

5. The steam turbine generator condenser vacuum system according to claim 4, characterized in that: Each of the condensate pump sets includes an inlet valve (3), a condensate pump (4) and a secondary valve group. The inlet valve (3) is respectively connected to the generator set (1) and the condensate pump (4), the condensate pump (4) is connected to the secondary valve group, and the secondary valve group is connected to the deaeration valve (8).

6. The steam turbine generator condenser vacuum system according to claim 5, wherein: The secondary valve group includes a check valve (5) and an outlet valve (7). The condensate pump (4) is connected to the check valve (5), the check valve (5) is connected to the outlet valve (7), and the outlet valve (7) is connected to the deaeration valve (8).

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