Oil supply system of diesel power station

Abstract

The utility model relates to a diesel power station oil supply system which comprises a first diesel supply unit, a second diesel supply unit, an oil tank, an oil pump, a main oil inlet pipe, a main oil return pipe, a first generator set, a second generator set, a third generator set, a fourth generator set, a fifth generator set and a sixth generator set. The parallel operation mode can ensure that two sets of diesel oil supply units supply oil to six units at the same time; the independent operation mode can ensure that a single set of diesel oil supply unit supplies oil to three units respectively; the mutual standby operation mode can ensure that after one diesel oil supply unit breaks down, the other diesel oil supply unit supplies oil in a standby mode. The utility model can avoid the influence on the power supply safety and reliability of the power station due to the fault of the diesel supply unit.

Description

Technical Field

[0001] The utility model relates to the technical field of the fuel oil supply system of a central power station, in particular to a fuel oil supply system for a diesel power station. Background Art

[0002] According to the requirements of the technical specification, a total of two sets of diesel supply units are arranged in the fuel oil supply system of the central power station to meet the fuel oil supply requirements of six units. See Figure 2 , the two sets of diesel supply units supply fuel oil to the six units simultaneously in a parallel manner. However, after running for a period of time, it is found that there are imperfections in the existing fuel oil supply system, that is, when one of the two fuel oil supply units fails, the other diesel supply unit cannot meet the operation requirements of the six units, which easily leads to power outage of the power station due to insufficient fuel oil supply and poses a safety hazard. Summary of the Utility Model

[0003] The utility model aims to solve the deficiencies of the existing technology, and provides a fuel oil supply system for a diesel power station, which optimizes the existing fuel oil supply system, avoids affecting the normal power supply of the entire power station when one of the diesel supply units fails, and at the same time adds a standby fuel oil supply device to improve the safety and reliability of the fuel oil supply system.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] A fuel oil supply system for a diesel power station includes a first diesel supply unit, a second diesel supply unit, a fuel tank, an oil pump, a main inlet pipe, a main return pipe, a first generator set, a second generator set, a third generator set, a fourth generator set, a fifth generator set and a sixth generator set. Both the first diesel supply unit and the second diesel supply unit are provided with two inlet ports and two return ports;

[0006] One inlet port of the first diesel supply unit is connected to the main inlet pipe through a first inlet pipe, and a first three-way valve is provided on the first inlet pipe. The other inlet port of the first diesel supply unit is connected to the fuel tank through a second inlet pipe, and a second three-way valve is provided on the second inlet pipe. One return port of the first diesel supply unit is communicated with the main return pipe through a first return pipe, and a third three-way valve is provided on the first return pipe. The other return port of the first diesel supply unit is communicated with the fuel tank through a second return pipe;

[0007] One inlet port of the second diesel supply unit is connected to the main inlet pipe through a third inlet pipe. The other inlet port of the second diesel supply unit is connected to the fuel tank through a fourth inlet pipe. One return port of the second diesel supply unit is communicated with the main return pipe through a third return pipe, and a fourth three-way valve is provided on the third return pipe. The other return port of the second diesel supply unit is communicated with the fuel tank through a fourth return pipe;

[0008] On the main fuel inlet pipe, a No. 5 three-way valve is provided at the front end of the first fuel inlet pipe, a No. 6 three-way valve is provided between the first fuel inlet pipe and the third fuel inlet pipe, and a No. 7 three-way valve is provided at the rear end of the third fuel inlet pipe; on the main fuel return pipe, an No. 8 three-way valve is provided between the first fuel return pipe and the third fuel return pipe;

[0009] The fuel inlet ports of the first generator set, the second generator set, and the third generator set are all connected to the main fuel inlet pipe at the front end of the No. 5 three-way valve, and the fuel return ports of the first generator set, the second generator set, and the third generator set are evenly connected to the main fuel return pipe at the front end of the first fuel return pipe; the fuel inlet ports of the fourth generator set, the fifth generator set, and the sixth generator set are all connected to the main fuel inlet pipe at the rear end of the No. 7 three-way valve, and the fuel return ports of the fourth generator set, the fifth generator set, and the sixth generator set are all connected to the main fuel return pipe at the rear end of the third fuel return pipe;

[0010] A spare pipe is provided between the No. 1 three-way valve and the No. 2 three-way valve, and a check valve and an oil pump are provided on the spare pipe.

[0011] The nominal diameter of the main fuel inlet pipe and the main fuel return pipe is 65 mm.

[0012] The nominal diameter of the first fuel inlet pipe, the second fuel inlet pipe, the first fuel return pipe, and the second fuel return pipe is 65 mm.

[0013] The nominal diameter of the third fuel inlet pipe, the fourth fuel inlet pipe, the third fuel return pipe, and the fourth fuel return pipe is 65 mm.

[0014] The nominal diameter of the pipe connecting the fuel inlet ports of the first generator set, the second generator set, and the third generator set to the main fuel inlet pipe is 40 mm.

[0015] The nominal diameter of the pipe connecting the fuel return ports of the fourth generator set, the fifth generator set, and the sixth generator set to the main fuel return pipe is 40 mm.

[0016] The beneficial effects of the present utility model are: The present utility model has three operation modes, namely, parallel operation mode, independent operation mode, and mutual standby operation mode, which can avoid affecting the power supply safety and reliability of the power station due to the failure of the diesel fuel supply unit. Description of the Drawings

[0017] Figure 1 is a structural schematic diagram of the present utility model;

[0018] Figure 2 is a structural schematic diagram of the existing diesel fuel supply system in the background technology;

[0019] In the figure: 1 - First diesel supply unit; 2 - Second diesel supply unit; 3 - Fuel tank; 4 - Oil pump; 5 - Main fuel inlet pipe; 6 - Main fuel return pipe; 7 - First generator set; 8 - Second generator set; 9 - Third generator set; 10 - Fourth generator set; 11 - Fifth generator set; 12 - Sixth generator set; 13 - First fuel inlet pipe; 14 - First three-way valve; 15 - Second fuel inlet pipe; 16 - Second three-way valve; 17 - First fuel return pipe; 18 - Third three-way valve; 19 - Second fuel return pipe; 20 - Third fuel inlet pipe; 21 - Fourth fuel inlet pipe; 22 - Third fuel return pipe; 23 - Fourth three-way valve; 24 - Fourth fuel return pipe; 25 - Fifth three-way valve; 26 - Sixth three-way valve; 27 - Seventh three-way valve; 28 - Eighth three-way valve; 29 - Spare pipe; 30 - Check valve;

[0020] The following will describe in detail with reference to the accompanying drawings in conjunction with the embodiments of the present invention. Specific embodiments

[0021] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention. The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will be clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0022] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] As Figure 1As shown in the figure, a fuel supply system for a diesel power station includes a first diesel supply unit 1, a second diesel supply unit 2, a fuel tank 3, a fuel pump 4, a main fuel inlet pipe 5, a main fuel return pipe 6, a first generator set 7, a second generator set 8, a third generator set 9, a fourth generator set 10, a fifth generator set 11, and a sixth generator set 12. Both the first diesel supply unit 1 and the second diesel supply unit 2 are provided with two fuel inlet ports and two fuel return ports.

[0026] One fuel inlet port of the first diesel supply unit 1 is connected to the main fuel inlet pipe 5 through a first fuel inlet pipe 13. A first three-way valve 14 is provided on the first fuel inlet pipe 13. The other fuel inlet port of the first diesel supply unit 1 is connected to the fuel tank 3 through a second fuel inlet pipe 15. A second three-way valve 16 is provided on the second fuel inlet pipe 15. One fuel return port of the first diesel supply unit 1 is communicated with the main fuel return pipe 6 through a first fuel return pipe 17. A third three-way valve 18 is provided on the first fuel return pipe 17. The other fuel return port of the first diesel supply unit 1 is communicated with the fuel tank 3 through a second fuel return pipe 19.

[0027] One fuel inlet port of the second diesel supply unit 2 is connected to the main fuel inlet pipe 5 through a third fuel inlet pipe 20. The other fuel inlet port of the second diesel supply unit 2 is connected to the fuel tank 3 through a fourth fuel inlet pipe 21. One fuel return port of the second diesel supply unit 2 is communicated with the main fuel return pipe 6 through a third fuel return pipe 22. A fourth three-way valve 23 is provided on the third fuel return pipe 22. The other fuel return port of the second diesel supply unit 2 is communicated with the fuel tank 3 through a fourth fuel return pipe 24.

[0028] On the main fuel inlet pipe 5, a fifth three-way valve 25 is provided at the front end of the first fuel inlet pipe 13, a sixth three-way valve 26 is provided between the first fuel inlet pipe 13 and the third fuel inlet pipe 20, and a seventh three-way valve 27 is provided at the rear end of the third fuel inlet pipe 20. On the main fuel return pipe 6, an eighth three-way valve 28 is provided between the first fuel return pipe 17 and the third fuel return pipe 22.

[0029] The fuel inlet ports of the first generator set 7, the second generator set 8, and the third generator set 9 are all connected to the main fuel inlet pipe 5 in front of the fifth three-way valve 25. The fuel return ports of the first generator set 7, the second generator set 8, and the third generator set 9 are all connected to the main fuel return pipe 6 in front of the first fuel return pipe 17. The fuel inlet ports of the fourth generator set 10, the fifth generator set 11, and the sixth generator set 12 are all connected to the main fuel inlet pipe 5 behind the seventh three-way valve 27. The fuel return ports of the fourth generator set 10, the fifth generator set 11, and the sixth generator set 12 are all connected to the main fuel return pipe 6 behind the third fuel return pipe 22.

[0030] A spare pipe 29 is provided between the first three-way valve 14 and the second three-way valve 16. A one-way valve 30 and a fuel pump 4 are provided on the spare pipe 29.

[0031] The main fuel inlet pipe 5, the main fuel return pipe 6, the first fuel inlet pipe 13, the second fuel inlet pipe 15, the first fuel return pipe 17, the second fuel return pipe 19, the third fuel inlet pipe 20, the fourth fuel inlet pipe 21, the third fuel return pipe 22, and the fourth fuel return pipe 24 all use pipes with a diameter of DN65.

[0032] The pipes connecting the fuel inlets of the first generator set 7, the second generator set 8, and the third generator set 9 to the main fuel inlet pipe 5, and the pipes connecting the fuel return ports of the fourth generator set 10, the fifth generator set 11, and the sixth generator set 12 to the main fuel return pipe 6 all use pipes with a diameter of DN40.

[0033] The original fuel supply system supplies fuel to six units by two diesel supply units. As Figure 2 shown, when this scheme is adopted, since the two diesel supply units supply fuel to the six units in parallel, when one of the diesel supply units fails, the other diesel supply unit cannot meet the fuel supply requirements of the six units, and it is easy to have insufficient fuel supply, which may easily lead to power outage accidents.

[0034] To avoid the situation where when one diesel supply unit fails, the other diesel supply unit cannot meet the fuel supply of the units, resulting in accidents such as fuel underpressure and unit shutdown, the present utility model adjusts the original single parallel operation mode of the two diesel supply units to a parallel operation mode + independent operation mode. As Figure 1 shown, by redesigning the fuel supply system, the first diesel supply unit 1 and the second diesel supply unit 2 are independent of each other and serve as backups for each other, changing the original single parallel operation mode to three operation modes:

[0035] a. Parallel operation mode: The two diesel supply units supply fuel to the six units simultaneously;

[0036] b. Independent operation mode: A single diesel supply unit supplies fuel to three units respectively;

[0037] c. Backup operation mode for each other: After one diesel supply unit fails, the other supply unit supplies fuel as a backup;

[0038] The three operation modes can be flexibly switched, fundamentally avoiding power loss in the power station caused by the failure of one diesel supply unit.

[0039] On the basis of the above optimization and improvement, to further improve the safety and reliability of the fuel supply system, an additional oil pump 4 is added as a backup. When the main supply oil pump of the diesel supply unit fails, it is switched to the backup oil pump 4 for fuel supply, thus avoiding affecting the normal power supply of the power station during the maintenance or failure of the diesel supply unit.

[0040] After the implementation of the above optimization and improvement method, the fuel supply mode of the unit has the following obvious improvements on the original basis:

[0041] The first diesel supply unit 1 can supply the first generator set 7, the second generator set 8, and the third generator set 9, and the second diesel supply unit 2 can supply the fourth generator set 10, the fifth generator set 11, and the sixth generator set 12; the first diesel supply unit 1 and the second diesel supply unit 2 operate independently without affecting each other.

[0042] When the first diesel supply unit 1 fails, the second diesel supply unit 2 can supply oil to the first generator set 7, the second generator set 8, the third generator set 9, or the fourth generator set 10, the fifth generator set 11, and the sixth generator set 12 through the switching of valves, and vice versa, so as to achieve the purpose that the first diesel supply unit 1 and the second diesel supply unit 2 are backup for each other.

[0043] When both the first diesel supply unit 1 and the second diesel supply unit 2 fail, or when the first diesel supply unit 1 and the second diesel supply unit 2 need to be repaired and maintained simultaneously, the emergency oil pump 4 is started to achieve uninterrupted power supply of the power station.

[0044] In summary, after the optimization and improvement of the power station oil supply system, it can fundamentally avoid affecting the power supply safety and reliability of the power station due to the failure of the diesel supply unit.

[0045] The above has made an exemplary description of the present invention in conjunction with the drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A diesel power station fuel supply system, characterized in that: The invention comprises a first diesel supply unit (1), a second diesel supply unit (2), a fuel tank (3), an oil pump (4), a main oil inlet pipe (5), a main oil return pipe (6), a No. 1 generator set (7), a No. 2 generator set (8), a No. 3 generator set (9), a No. 4 generator set (10), a No. 5 generator set (11) and a No. 6 generator set (12), wherein the first diesel supply unit (1) and the second diesel supply unit (2) are both provided with two oil inlets and two oil return ports; An oil inlet of the first diesel supply unit (1) is connected to the main oil inlet pipe (5) through a first oil inlet pipe (13), a No. 1 three-way valve (14) is provided on the first oil inlet pipe (13), another oil inlet of the first diesel supply unit (1) is connected to the oil tank (3) through a second oil inlet pipe (15), a No. 2 three-way valve (16) is provided on the second oil inlet pipe (15), an oil return port of the first diesel supply unit (1) is connected to the main oil return pipe (6) through a first oil return pipe (17), a No. 3 three-way valve (18) is provided on the first oil return pipe (17), another oil return port of the first diesel supply unit (1) is connected to the oil tank (3) through a second oil return pipe (19); An oil inlet of the second diesel supply unit (2) is connected to the main oil inlet pipe (5) via a third oil inlet pipe (20), another oil inlet of the second diesel supply unit (2) is connected to the oil tank (3) via a fourth oil inlet pipe (21), an oil return port of the second diesel supply unit (2) is connected to the main oil return pipe (6) via a third oil return pipe (22), a No. 4 three-way valve (23) is provided on the third oil return pipe (22), and another oil return port of the second diesel supply unit (2) is connected to the oil tank (3) via a fourth oil return pipe (24); A No. 5 three-way valve (25) is provided on the main oil inlet pipe (5) at the front end of the first oil inlet pipe (13), a No. 6 three-way valve (26) is provided between the first oil inlet pipe (13) and the third oil inlet pipe (20), and a No. 7 three-way valve (27) is provided at the rear end of the third oil inlet pipe (20); and a No. 8 three-way valve (28) is provided on the main oil return pipe (6) between the first oil return pipe (17) and the third oil return pipe (22); The oil inlets of the No. 1 generator set (7), the No. 2 generator set (8) and the No. 3 generator set (9) are all connected to the main oil inlet pipe (5) at the front end of the No. 5 three-way valve (25), and the oil return ports of the No. 1 generator set (7), the No. 2 generator set (8) and the No. 3 generator set (9) are all connected to the main oil return pipe (6) at the front end of the first oil return pipe (17); the oil inlets of the No. 4 generator set (10), the No. 5 generator set (11) and the No. 6 generator set (12) are all connected to the main oil inlet pipe (5) at the rear end of the No. 7 three-way valve (27), and the oil return ports of the No. 4 generator set (10), the No. 5 generator set (11) and the No. 6 generator set (12) are all connected to the main oil return pipe (6) at the rear end of the third oil return pipe (22); A spare pipe (29) is provided between the No. 1 three-way valve (14) and the No. 2 three-way valve (16), and a one-way valve (30) and an oil pump (4) are provided on the spare pipe (29).

2. A diesel power station oil supply system according to claim 1, characterized in that: The nominal diameters of the main oil inlet pipe (5) and the main oil return pipe (6) are 65 mm.

3. A diesel power station oil supply system according to claim 2, characterized in that: The nominal diameters of the first oil inlet pipe (13), the second oil inlet pipe (15), the first oil return pipe (17) and the second oil return pipe (19) are 65 mm.

4. A diesel power station oil supply system according to claim 3, characterized in that: The nominal diameters of the third oil inlet pipe (20), the fourth oil inlet pipe (21), the third oil return pipe (22) and the fourth oil return pipe (24) are 65 mm.

5. A diesel power station oil supply system according to claim 4, characterized in that: The nominal diameter of the pipes connecting the oil inlets of the No. 1 generator set (7), the No. 2 generator set (8) and the No. 3 generator set (9) and the main oil inlet pipe (5) is 40 mm.

6. A diesel power station oil supply system according to claim 5, characterized in that: The nominal diameter of the pipes connecting the oil return ports of the No. 4 generator set (10), the No. 5 generator set (11), and the No. 6 generator set (12) and the main oil return pipe (6) is 40 mm.

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