Oil-water-sand separation dredging system for underground powerhouse of hydropower station

Abstract

The utility model provides an oil-water-sand separation desilting system for an underground powerhouse of a hydropower station. The oil-water-sand separation desilting system comprises a water collecting well, a drainage gallery, a floor drain, a water conveying pipeline, an oil pool, an oily sewage treatment system and a grit chamber, arranging a water-collecting well at the lowest position of the underground powerhouse; rock mass seepage water around the underground powerhouse is communicated with an inlet of the drainage gallery; an outlet of the drainage gallery is communicated with an inlet of the grit chamber; an outlet of the grit chamber is communicated with an inlet of the water collecting well; each underground powerhouse electromechanical equipment room is provided with a floor drain, and the water outlet end of each floor drain is communicated with an inlet of the water conveying pipeline. An outlet of the water conveying pipeline communicates with an inlet of the oil pool. Hydropower station underground powerhouse surrounding rock seepage water and oil-mixed water generated by electromechanical equipment are subjected to split-flow treatment, the oil-mixed water generated by the electromechanical equipment is subjected to oil-water separation and then is mixed with the surrounding rock seepage water for desanding in the grit chamber, the total amount of water treated by the oily sewage treatment system is greatly reduced, equipment configuration is optimized, investment is obviously saved, and the economic benefit is increased. The overall sewage treatment efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment, and in particular relates to an oil-water-sand separation and dredging system for an underground powerhouse of a hydropower station. Background Art

[0002] There are many electromechanical equipment rooms in the underground powerhouse of a hydropower station, many of which involve oil pressure operations and oil lubrication. The equipment and pipelines are in long-term operation, which is prone to oil leakage, thereby generating oily sewage. In addition, due to the layout of the underground powerhouse of a hydropower station, a lot of surrounding rock seepage will be generated. In the prior art, oily sewage and surrounding rock seepage share the same set of sewage treatment equipment. After the oily sewage and surrounding rock seepage are mixed, the oil layer is separated and filtered through the sewage treatment device, and then the water layer is discharged, thereby ensuring the safety of the groundwater body. This method has the following problems: Since the amount of water after the oily sewage and surrounding rock seepage are mixed is large, it is necessary to use high-power oily sewage treatment equipment to separate and filter the oil layer, which consumes a lot of electricity and time, thereby reducing the overall sewage treatment efficiency, and is not energy-saving and environmentally friendly. Utility Model Content

[0003] In view of the defects in the prior art, the utility model provides an oil-water-sand separation and dredging system for an underground powerhouse of a hydropower station, which can effectively solve the above problems.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The utility model provides an oil-water-sand separation and silt removal system for an underground powerhouse of a hydropower station, comprising a water collection well (1), a drainage gallery (2), a floor drain (3), a water delivery pipeline (4), an oil pool (5), an oily sewage treatment system (6) and a sand settling tank (7);

[0006] The water collection well (1) is arranged at the lowest position of the underground powerhouse; the water seepage from the rock mass around the underground powerhouse is connected to the entrance of the drainage gallery (2); the outlet of the drainage gallery (2) is connected to the entrance of the grit chamber (7); the outlet of the grit chamber (7) is connected to the entrance of the water collection well (1);

[0007] The floor drain (3) is installed in each underground factory mechanical and electrical equipment room, and the water outlet of the floor drain (3) is connected to the inlet of the water pipeline (4); the outlet of the water pipeline (4) is connected to the inlet of the oil pool (5); the outlet of the oil pool (5) is connected to the inlet of the oily wastewater treatment system (6); the outlet of the oily wastewater treatment system (6) is connected to the inlet of the grit chamber (7).

[0008] Preferably, a partition wall is arranged in the middle of the water collection well (1) to divide the water collection well (1) into a left water collection unit and a right water collection unit; a connecting pipe is arranged between the left water collection unit and the right water collection unit;

[0009] A submersible sewage pump (10) is installed at the bottom of the well of the left water collection unit and the right water collection unit; a deep well pump (8) is installed above the left water collection unit and the right water collection unit; the inlet of the deep well pump (8) is connected to the bottom of the water collection well (1); the outlet of the deep well pump (8) is connected to a drainage pipe; and a control valve (9) is installed on the drainage pipe.

[0010] The utility model provides an oil-water-sand separation and dredging system for underground powerhouses of a hydropower station, which has the following advantages:

[0011] The water seepage (clean water) from the surrounding rocks of the underground powerhouse of the hydropower station and the oil-mixed water produced by the electromechanical equipment are separated for treatment. After the oil and water are separated, the oil-mixed water produced by the electromechanical equipment is mixed with the water seepage from the surrounding rocks in the grit chamber to remove the sand. This greatly reduces the total amount of water treated by the oily wastewater treatment system, optimizes the equipment configuration, significantly saves investment, improves the overall wastewater treatment efficiency, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic structural diagram of the oil-water-sand separation and silt removal system for the underground powerhouse of a hydropower station.

[0013] in:

[0014] Among them: 1---water collection well; 2---drainage gallery; 3---floor drain; 4---water pipeline; 5---oil pool; 6---oil-containing sewage treatment system; 7---sand settling tank; 8---deep well pump; 9---control valve; 10---submersible sewage pump;

[0015] The direction indicated by the arrow is the direction of water flow. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] See also Figure 1 The utility model provides an oil-water-sand separation and dredging system for an underground powerhouse of a hydropower station, comprising a water collection well 1, a drainage gallery 2, a floor drain 3, a water delivery pipeline 4, an oil pool 5, an oily sewage treatment system 6 and a sand settling tank 7;

[0018] A water collection well 1 is set at the lowest position of the underground powerhouse; the rock seepage around the underground powerhouse is connected to the entrance of the drainage gallery 2; the outlet of the drainage gallery 2 is connected to the entrance of the grit chamber 7; the outlet of the grit chamber 7 is connected to the entrance of the water collection well 1;

[0019] A floor drain 3 is installed in each underground factory mechanical and electrical equipment room, and the water outlet of the floor drain 3 is connected to the inlet of the water pipeline 4; the outlet of the water pipeline 4 is connected to the inlet of the oil pool 5; the outlet of the oil pool 5 is connected to the inlet of the oily wastewater treatment system 6; the outlet of the oily wastewater treatment system 6 is connected to the inlet of the sand settling tank 7.

[0020] A partition wall is arranged in the middle of the water collection well 1 to divide the water collection well 1 into a left water collection unit and a right water collection unit; a connecting pipe is arranged between the left water collection unit and the right water collection unit;

[0021] Submersible sewage pumps 10 are installed at the bottom of the wells of the left water collection unit and the right water collection unit; deep well pumps 8 are installed above the left water collection unit and the right water collection unit; the inlet of the deep well pump 8 is connected to the bottom of the water collection well 1; the outlet of the deep well pump 8 is connected to the drainage pipe; and the drainage pipe is installed with a control valve 9.

[0022] A specific embodiment is described below:

[0023] like Figure 1 As shown, the utility model discloses an oil-water-sand separation and silting system for an underground powerhouse of a hydropower station, comprising a drainage gallery 2, a water collection well 1, a floor drain 3, a sand settling tank 7, an oil pool 5, an oily sewage treatment system 6, a deep well pump 8, a submersible sewage pump 10, a control valve 9, a water delivery pipeline 4, cables and a control box;

[0024] The drainage gallery 2 is arranged at each layer of the outer periphery of the underground powerhouse, collects the seepage water from each layer of surrounding rock, and is connected to the sand settling tank 7 at the entrance of the water collection well 1 at the lowest point of the underground powerhouse;

[0025] The floor drain 3 and the water pipe are used to collect the drainage from the electromechanical equipment room in the industrial plant with the risk of oil leakage and enter the oil pool 5; the oily sewage treatment system 6 separates the oil mixed with water in the oil pool 5, and the separated clean water is collected into the sand settling tank 7, and the oil is regularly cleaned out of the factory;

[0026] A sand settling tank 7 is set at the end of the drainage gallery 2 to precipitate and separate the sediment in the surrounding rock seepage water and the separated clean water, and then discharge it into the water collection well 1 to avoid sediment accumulation in the water collection well 1 and prevent the wear of the pump body, valves and other equipment by the sediment;

[0027] The clean water in the water collection well 1 is directly discharged to the outside of the ground factory building through the deep well pump 8.

[0028] The control box is connected to the deep well pump 8, the submersible sewage pump 10 and the oily sewage treatment system 6 through cables to control the sewage treatment process.

[0029] The working principle of the utility model is described in detail below:

[0030] The seepage water from the surrounding rock of the underground powerhouse flows directly into the grit chamber 7 at the entrance of the water collection well 1 at the lowest point of the underground powerhouse through the drainage gallery 2. The possible oily sewage discharged from the electromechanical equipment room is diverted and discharged into the oil pool 5 through the floor drain 3 and the water pipeline 4. The oily sewage treatment system 6 separates the oil mixed water in the oil pool 5, and the separated clean water is collected into the grit chamber 7. The oil pollution is regularly cleaned out of the factory.

[0031] A sand trap 7 is set at the end of the drainage gallery 2 to separate the silt in the water, avoid silt accumulation in the water collection well 1, and prevent the silt from wearing the deep well pump 8, control valve 9 and other equipment. The control box is connected to the deep well pump 8, submersible sewage pump 10 and oily sewage treatment system 6 through cables to control the sewage treatment process.

[0032] A partition wall is set in the middle of the water collection well 1 to divide the water collection well 1 into a left water collection unit and a right water collection unit, and a connecting pipe is set in the middle. During dredging, the connecting pipe in the middle of the partition wall and the drainage pipe of the drainage gallery 2 leading to the dredging side water collection unit are blocked, and the submersible sewage pump 10 is used to drain the remaining accumulated water in the dredging side water collection unit to the other side water collection unit, and then the dredging side water collection unit is dredged.

[0033] The following is a further explanation of the underground powerhouse project of a large pumped storage power station using the technical solution of the utility model as an example combined with the accompanying drawings:

[0034] A large-scale pumped storage power station project in northern China, with an underground plant of about 180m long, 26m wide and 55m high, including an auxiliary cavern, with a total underground volume of about 270,000m 3 , a total of three layers of drainage corridors are set up on the periphery, and a large number of electromechanical equipment are arranged. The oil-water-sand separation and silting system of the underground powerhouse of the hydropower station of the utility model is adopted. The seepage water of the surrounding rock of the underground powerhouse directly flows into the grit tank 7 at the entrance of the water collection well 1 at the lowest point of the underground powerhouse through the drainage corridor 2. The possible oily sewage discharged from the electromechanical equipment room is discharged into the oil pool 5 through the floor drain 3 and the water pipeline 4. The oily sewage treatment system 6 separates the oil mixed water in the oil pool 5, and discharges the separated clean water into the grit tank 7 at the entrance of the water collection well 1. The oil pollution is regularly treated outside the factory;

[0035] A sand settling tank 7 is arranged at the end of the drainage gallery 2 to precipitate and separate the silt in the water, thereby avoiding silt accumulation in the water collection well 1 and preventing the silt from wearing the deep well pump 8, control valve 9 and other equipment.

[0036] A partition wall is set in the middle of the water collection well 1 to divide the water collection well 1 into two sides, and a connecting pipe is set in the partition wall. When desilting, the connecting pipe in the middle of the partition wall and the drainage pipe leading to the water collection unit on the desilting side through the drainage gallery are blocked, and the remaining accumulated water is discharged to the water collection unit on the other side of the water collection well by a submersible sewage pump 10, and then the desilting side is desilted.

[0037] The dimensions of the water collection well 1 are 18m long x 7m wide x 16m high; the treatment capacity of the oily wastewater treatment system 6 is 20m 3 / h, the size of the sedimentation tank 7 is 3m long x 2m wide x 3m high, and the flow rate of the submersible sewage pump 10 is 160m 3 / h, the head is 30m, and the flow rate of deep well pump 8 is 400m 3 / h, the head is 143m.

[0038] The utility model provides an oil-water-sand separation and dredging system for an underground powerhouse of a hydropower station, which has the following advantages:

[0039] (1) The seepage water (clean water) from the surrounding rock of the underground powerhouse of the hydropower station and the oil-mixed water generated by the electromechanical equipment are separated and then mixed with the seepage water from the surrounding rock in the grit chamber to remove sand. This greatly reduces the total amount of water treated by the oily wastewater treatment system, optimizes the equipment configuration, significantly saves investment, improves the overall wastewater treatment efficiency, and saves energy and protects the environment.

[0040] (2) A sand settling tank is set at the end of the drainage corridor and the water collection well to precipitate and separate the silt in the water, avoid silt accumulation in the water collection well, and prevent silt from wearing the pump body, valves and other equipment, thereby extending the service life of electromechanical equipment and improving the reliability of system operation.

[0041] (3) By setting a partition wall in the middle of the water collection well, the dredging of the water collection well is convenient, the equipment configuration is simplified, and it is economical and safe.

[0042] (4) It can realize oil-water-sand separation in the underground powerhouse of hydropower stations, save energy and protect the environment, and can be widely used in underground powerhouse system projects.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. An oil-water-sand separation and dredging system for an underground powerhouse of a hydropower station, characterized in that: It includes a water collection well (1), a drainage gallery (2), a floor drain (3), a water pipeline (4), an oil pool (5), an oily sewage treatment system (6) and a sand settling tank (7); The water collection well (1) is arranged at the lowest position of the underground powerhouse; the water seepage from the rock mass around the underground powerhouse is connected to the entrance of the drainage gallery (2); the outlet of the drainage gallery (2) is connected to the entrance of the grit chamber (7); the outlet of the grit chamber (7) is connected to the entrance of the water collection well (1); The floor drain (3) is installed in each underground factory mechanical and electrical equipment room, and the water outlet of the floor drain (3) is connected to the inlet of the water pipeline (4); the outlet of the water pipeline (4) is connected to the inlet of the oil pool (5); the outlet of the oil pool (5) is connected to the inlet of the oily wastewater treatment system (6); the outlet of the oily wastewater treatment system (6) is connected to the inlet of the grit chamber (7).

2. The oil-water-sand separation and dredging system for underground powerhouse of a hydropower station according to claim 1, characterized in that: A partition wall is arranged in the middle of the water collection well (1) to divide the water collection well (1) into a left water collection unit and a right water collection unit; a connecting pipe is arranged between the left water collection unit and the right water collection unit; A submersible sewage pump (10) is installed at the bottom of the well of the left water collection unit and the right water collection unit; a deep well pump (8) is installed above the left water collection unit and the right water collection unit; the inlet of the deep well pump (8) is connected to the bottom of the water collection well (1); the outlet of the deep well pump (8) is connected to a drainage pipe; and a control valve (9) is installed on the drainage pipe.

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