Emulsion automatic proportioning system and method

Abstract

The invention relates to an automatic emulsion proportioning system and method, the automatic emulsion proportioning system comprises a water inlet liquid tank, a main pipeline, a parallel connection pipeline, an oil suction pipeline, an emulsified oil tank and an emulsified liquid tank; the inlet end of the main pipeline is connected with the water inlet liquid tank, the water pump, the first one-way valve and the bypass pipeline are sequentially arranged on the main pipeline in the liquid conveying direction, and the two ends of the parallel connection pipeline are connected to the positions, at the two ends of the water pump, of the main pipeline respectively. The second one-way valve is arranged close to the outlet end of the water pump and enables liquid to flow unidirectionally from the outlet end of the water pump to the inlet end of the jet device. The inlet end and the outlet end of the oil suction pipeline are respectively connected with the emulsified oil tank and the negative pressure port of the jet device in an on-off manner, and the bypass pipeline is connected with the emulsified liquid tank in an on-off manner. According to the invention, accurate control of the emulsion concentration can be realized more easily.

Description

Technical Field

[0001] The present invention relates to the field of coal mines, and particularly to an automatic emulsion proportioning system and method. Background Art

[0002] As the transmission medium of hydraulic supports, the accuracy of the concentration of emulsion directly affects the service life and cost of hydraulic supports. Only a reasonable emulsion concentration can enable the base oil, emulsifier, surfactant, antioxidant, etc. in it to have good performance. According to the "Coal Mine Safety Regulations", the concentration of the prepared emulsion should be controlled between 3% and 5%. If the concentration is too high, while the production cost increases, it will also irritate the skin, the defoaming performance of the emulsion itself decreases, resulting in more foam, increasing the swelling of rubber sealing materials, accelerating the aging of seals and conveying pipelines, and leading to adverse consequences such as liquid leakage and liquid cross-flow. However, if the emulsion concentration is too low, the hydraulic components of the equipment will be corroded by water and rust, causing component damage, thus shortening the service life of the equipment. In severe cases, it will lead to system leakage and affect the safe and reliable production of the working face. Therefore, it is necessary to strictly control the concentration of the emulsion to ensure the performance and life of coal mine support equipment and the safe and reliable production of the working face. With the development of technology, most current coal mines can control the concentration of emulsion by using an automatic emulsion proportioning system.

[0003] The existing automatic emulsion proportioning system mainly consists of a water tank 01, a pump 02, a pressure reducing valve 03, a water inlet valve 04, an emulsion oil tank 05, a one-way valve 06, a Venturi tube 08, an emulsion tank 09, etc. Among them, the Venturi tube 08 (also called a jet injector) consists of a converging tube, a throat tube, and a diverging tube. The principle schematic diagram of this system is as Figure 1 shown.

[0004] This automatic proportioning system utilizes the characteristics of the Venturi tube 08: high-speed water flow generates negative pressure at the throat to suck up the emulsion oil for mixing and proportioning. The specific working process is as follows: Water with a certain flow rate flows into the Venturi tube 08 through the water inlet valve 04. As Figure 2 shown, since the cross-sectional area at both ends of the Venturi tube 08 is larger than that in the middle, the water flow velocity increases at the middle cross-section and decreases at the outlet. In this way, the pressure at the throat of the Venturi tube 08 is less than the atmospheric pressure, generating negative pressure in the cavity. The emulsion oil in the emulsion oil tank 05 then flows upward under the action of the atmospheric pressure, opens the one-way valve 06, and enters the mixing chamber at the throat of the Venturi tube 08 through the flow valve 07, fully mixing with the water to form an emulsion and flowing into the emulsion tank 09. The function of the one-way valve 06 on the oil suction pipe is to keep the oil suction pipe full of emulsion oil and prevent the water in the system from flowing back into the emulsion oil tank 05. In order to facilitate the control of the emulsion proportioning, a flow valve 07 is installed in the system.

[0005] However, when the current technology is used to meet the demand for a large flow of emulsion liquid, a relatively large water flow is required, that is, the flow velocity through the throat of the Venturi tube 08 is relatively high, and the negative pressure in its cavity is relatively large, resulting in a relatively large amount of oil absorption. The concentration of the emulsion liquid is between 3% and 5%. Although there is a flow valve 07 to control the flow rate, it is not easy to accurately control the concentration of the emulsion liquid. Eventually, the concentration of the emulsion liquid fluctuates greatly, even exceeding the recommended concentration range, which is not conducive to the performance and service life of coal mine support equipment and the safe and reliable production of the working face. Summary of the Invention

[0006] The purpose of the present invention is to provide an automatic emulsion liquid proportioning system and method, which can more easily achieve accurate control of the concentration of the emulsion liquid.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention provides an automatic emulsion liquid proportioning system, including an inlet liquid tank, a main pipeline, a parallel pipeline, an oil suction pipeline, an emulsion oil tank, and an emulsion liquid tank; the inlet end of the main pipeline is connected to the inlet liquid tank, and a water pump, a first one-way valve, and a bypass pipeline are sequentially arranged on the main pipeline along the liquid transportation direction. The two ends of the parallel pipeline are respectively connected to the main pipeline at both ends of the water pump. A jet pump and a second one-way valve are arranged on the parallel pipeline. The second one-way valve is arranged close to the outlet end of the water pump and can make the liquid flow unidirectionally from the outlet end of the water pump to the inlet end of the jet pump; the inlet end and the outlet end of the oil suction pipeline can be respectively connected to and disconnected from the emulsion oil tank and the negative pressure port of the jet pump, and the bypass pipeline is connected to and disconnected from the emulsion liquid tank.

[0009] In a preferred embodiment of the present invention, a regulating valve and / or a first flow meter are arranged on the oil suction pipeline, and the concentration of the emulsion liquid obtained after passing through the first one-way valve can be adjusted by changing the opening degree of the water pump, the opening degree of the regulating valve, and / or the flow rate of the first flow meter.

[0010] In a preferred embodiment of the present invention, the automatic emulsion liquid proportioning system further includes a controller; a first concentration meter is further arranged on the main pipeline between the first one-way valve and the bypass pipeline. The controller is electrically connected to the water pump, the first concentration meter, and the regulating valve, and can adjust the opening degree of the water pump and / or the opening degree of the regulating valve according to the data detected by the first concentration meter.

[0011] In a preferred embodiment of the present invention, an oil inlet switch valve and a filter are sequentially arranged on the oil suction pipeline along the liquid transportation direction near the emulsion oil tank, and a second flow meter is further arranged on the main pipeline between the first one-way valve and the bypass pipeline. The controller is also electrically connected to the oil inlet switch valve and the second flow meter.

[0012] In a preferred embodiment of the present invention, a return liquid inlet joint and an emulsion liquid outlet joint are also connectable to the emulsion liquid tank in a switchable manner, and a second concentration meter is connected to the emulsion liquid tank. The controller is also electrically connected to the second concentration meter and can adjust the opening degree of the water pump and / or the opening degree of the regulating valve according to the data detected by the second concentration meter.

[0013] In a preferred embodiment of the present invention, both the return liquid inlet joint and the emulsion liquid outlet joint are connected to the bottom of the first side wall of the emulsion liquid tank. One end of the return liquid inlet joint extends into the emulsion liquid tank and is communicated with the end of the bypass pipeline extending into the emulsion liquid tank.

[0014] In a preferred embodiment of the present invention, a baffle is further provided at the bottom inside the emulsion liquid tank. The first end of the baffle is connected to the first side wall, and there is an interval area between the second end and the corresponding side wall of the emulsion liquid tank. The baffle divides the bottom area near the first side wall inside the emulsion liquid tank into a first area and a second area, and the return liquid inlet joint and the emulsion liquid outlet joint are respectively arranged facing the first area and the second area.

[0015] In a preferred embodiment of the present invention, the part of the baffle near its second end inclines towards the second area and forms an inclined diversion plate.

[0016] In a preferred embodiment of the present invention, an external pipeline is further provided outside the emulsion liquid tank. Both ends of the external pipeline extend into the emulsion liquid tank. The first end of the external pipeline is located inside the second area and is arranged close to the inlet end of the emulsion liquid outlet joint, and the second end is arranged far from the inlet end of the emulsion liquid outlet joint. The second concentration meter is located outside the emulsion liquid tank and is connected to the external pipeline.

[0017] In a preferred embodiment of the present invention, a circulation pump is further connected to the external pipeline so that the liquid in the emulsion liquid tank enters from the first end of the external pipeline and flows back into the emulsion liquid tank through the second end.

[0018] In a preferred embodiment of the present invention, a reversing valve is further provided on the main pipeline and between the water inlet tank and the water pump. The emulsion liquid tank is also connected to the reversing valve through a conversion pipeline. The reversing valve can connect the water pump to the water inlet tank or to the emulsion liquid tank.

[0019] In a preferred embodiment of the present invention, the emulsion liquid tank is further connected to a first liquid level meter. The controller is also electrically connected to the first liquid level meter and the reversing valve, and can control the reversing of the reversing valve to connect the water pump to the emulsion liquid tank when the liquid level in the emulsion liquid tank is greater than the preset emulsion liquid level value.

[0020] The present invention also provides an automatic emulsified liquid proportioning method, including: pumping water from the inlet liquid tank by a water pump, and dividing the fluid after passing through the water pump into a first branch and a second branch. The fluid in the first branch flows through a first one-way valve and then flows to a first emulsified liquid outlet or to an emulsified liquid tank. The fluid in the second branch enters a jet pump to suck oil after passing through a second one-way valve. The water-oil liquid after being mixed by the jet pump can return to the inlet of the water pump and be mixed with the water pumped out by the water pump again.

[0021] In a preferred embodiment of the present invention, the automatic emulsified liquid proportioning method further includes: detecting in real time the concentration of the first liquid outlet near the first emulsified liquid outlet on the first branch; comparing the concentration of the first liquid outlet with a preset oil-water mixing concentration; when the concentration of the first liquid outlet is less than the preset oil-water mixing concentration, increasing the oil suction amount at the jet pump and / or reducing the opening degree of the water pump; when the concentration of the first liquid outlet is greater than the preset oil-water mixing concentration, reducing the oil suction amount at the jet pump and / or increasing the opening degree of the water pump.

[0022] In a preferred embodiment of the present invention, the automatic emulsified liquid proportioning method further includes: introducing the emulsified liquid return liquid into the emulsified liquid tank, mixing the emulsified liquid return liquid with the emulsified liquid flowing into the emulsified liquid tank after passing through the first one-way valve, and flowing out through a second emulsified liquid outlet on the emulsified liquid tank; detecting in real time the concentration of the second liquid outlet near the second emulsified liquid outlet in the emulsified liquid tank; comparing the concentration of the second liquid outlet with a preset return liquid concentration; when the concentration of the second liquid outlet is less than the preset return liquid concentration, increasing the concentration of the first liquid outlet; when the concentration of the second liquid outlet is greater than the preset return liquid concentration, reducing the concentration of the first liquid outlet.

[0023] In a preferred embodiment of the present invention, the automatic emulsified liquid proportioning method further includes: detecting in real time the liquid level in the emulsified liquid tank; comparing the liquid level in the emulsified liquid tank with a preset emulsified liquid level value; when the liquid level in the emulsified liquid tank is greater than the preset emulsified liquid level value, cutting off the connection between the water pump and the inlet liquid tank and connecting the emulsified liquid tank with the water pump.

[0024] As described above, for the automatic emulsified liquid proportioning system and method of the present invention, the jet pump and the water pump are connected in parallel to mix oil and water. The water flow is divided into two paths after passing through the water pump. One path flows to the first one-way valve, and the other path passes through the second one-way valve and enters the jet pump to suck oil. The oil and water are mixed in the jet pump and then mixed with the water pumped out from the inlet liquid tank again, realizing two-stage dilution of the emulsified oil. Moreover, the flow resistance of the branch where the jet pump is located is large and the water flow rate is small, so the oil suction amount per cycle is small, making the fluctuation range of the oil-water mixing concentration small, and it is easier to achieve precise proportioning control of the concentration of the emulsified liquid after oil-water mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention.

[0026] Wherein:

[0027] Figure 1 is a schematic structural diagram of an existing automatic emulsifying liquid proportioning system.

[0028] Figure 2 is a schematic diagram of a Venturi tube.

[0029] Figure 3 is a schematic structural principle diagram of the automatic emulsifying liquid proportioning system provided by the present invention.

[0030] Figure 4 is another schematic structural principle diagram of the automatic emulsifying liquid proportioning system provided by the present invention.

[0031] Figure 5 is a schematic three-dimensional diagram of the structure of the automatic emulsifying liquid proportioning system provided by the present invention.

[0032] Figure 6 is Figure 5 the top view of.

[0033] Figure 7 is a schematic three-dimensional diagram of the structure of the automatic emulsifying liquid proportioning system provided by the present invention on the side of the second concentration meter.

[0034] Figure 8 is another schematic three-dimensional diagram of the structure of the automatic emulsifying liquid proportioning system provided by the present invention on the side of the second concentration meter.

[0035] Explanation of the reference numerals in the drawings:

[0036] Prior art:

[0037] 01, water tank; 02, pump; 03, pressure reducing valve; 04, inlet valve; 05, emulsifying oil tank; 06, one-way valve; 07, flow valve; 08, Venturi tube; 09, emulsifying liquid tank.

[0038] The present invention:

[0039] 1, inlet liquid tank; 11, inlet assembly; 12, second liquid level meter;

[0040] 2, main pipeline; 21, reversing valve; 22, water pump; 23, first one-way valve; 24, second flowmeter; 25, first concentration meter; 26, bypass pipeline; 261, liquid outlet switch valve; 27, first emulsifying liquid outlet;

[0041] 3, parallel connection pipeline; 31, injector; 32, second one-way valve;

[0042] 4, oil suction pipeline; 41, oil inlet switch valve; 42, filter; 43, first flowmeter; 44, regulating valve;

[0043] 5. Emulsification oil tank; 51. Oil pumping assembly; 52. Emulsified oil barrel; 53. Third liquid level gauge;

[0044] 6. Emulsion tank; 61. Return liquid inlet joint; 62. Emulsion outlet joint; 63. External pipeline; 64. Second concentration meter; 65. Baffle; 651. Inclined diversion plate; 66. Circulation pump; 67. First liquid level gauge;

[0045] 7. Conversion pipeline. Detailed implementation manners

[0046] For a clearer understanding of the technical features, objectives and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0047] As Figures 3 to 8 shown, the present application provides an automatic emulsion proportioning system, including a feed water tank 1, a main pipeline 2, a parallel-connected pipeline 3, an oil suction pipeline 4, an emulsification oil tank 5 and an emulsion tank 6; the inlet end of the main pipeline 2 is connected to the feed water tank 1, and a water pump 22, a first one-way valve 23 and a bypass pipeline 26 are sequentially arranged on the main pipeline 2 along the liquid transportation direction. The two ends of the parallel-connected pipeline 3 are respectively connected to the main pipeline 2 at both ends of the water pump 22. A jet pump 31 and a second one-way valve 32 are arranged on the parallel-connected pipeline 3. The second one-way valve 32 is arranged near the outlet end of the water pump 22 and can make the liquid flow unidirectionally from the outlet end of the water pump 22 to the inlet end of the jet pump 31. The inlet end and the outlet end of the oil suction pipeline 4 are respectively connected to the emulsification oil tank 5 and the negative pressure port of the jet pump 31 in a switchable manner, and the bypass pipeline 26 is connected to the emulsion tank 6 in a switchable manner.

[0048] The jet pump 31 here is also a Venturi tube, including a gradually reducing tube, a throat tube and a gradually expanding tube that are coaxially connected in sequence from its inlet end to its outlet end. A negative pressure port is arranged on the side of the throat tube. The inlet end and the outlet end of the jet pump 31 are respectively arranged near the outlet end and the inlet end of the water pump 22. The specific structure of the jet pump 31 is an existing structure. The outlet end of the main pipeline 2 forms a first emulsion outlet 27, which can be used to connect to the hydraulic support of fully mechanized coal mining in a coal mine to provide the prepared emulsion for the hydraulic support. The first end of the bypass pipeline 26 is bypass-connected to the main pipeline 2 and is arranged near the first emulsion outlet 27. The second end of the bypass pipeline 26 is connected to the emulsion tank 6. When the system is in use, only one of the connection between the first emulsion outlet 27 and the hydraulic support and the connection between the bypass pipeline 26 and the emulsion tank 6 is in a connected state.

[0049] For the entire system, the injector 31 and the water pump 22 are connected in parallel to mix oil and water. After the water flows through the water pump 22, it is divided into two paths. One path flows to the first one-way valve 23, and the other path passes through the second one-way valve 32 and enters the injector 31 to suck oil. The oil and water are mixed in the injector 31 and then mixed with the water pumped out from the water inlet tank 1, realizing two dilutions of the emulsified oil. Moreover, the flow resistance of the branch where the injector 31 is located is large and the water flow rate is small, so the oil suction volume per cycle is small, making the fluctuation range of the oil-water mixing concentration small, and it is easier to achieve precise ratio control of the concentration of the emulsified liquid after oil-water mixing.

[0050] In a specific implementation manner, a regulating valve 44 and / or a first flowmeter 43 are provided on the oil suction pipeline 4. The concentration of the emulsified liquid obtained after passing through the first one-way valve 23 can be adjusted by changing the opening degree of the water pump 22, the opening degree of the regulating valve 44, and / or the flow rate of the first flowmeter 43.

[0051] According to the liquid concentration after the first one-way valve 23 on the main pipeline 2, the opening degree of the regulating valve 44 and / or the flow rate of the first flowmeter 43 can be selected to adjust the oil suction volume at the injector 31, or the opening degree of the water pump 22 can be selected to adjust the water flow rate, thereby adjusting the liquid concentration after the first one-way valve 23, that is, the concentration of the prepared emulsified liquid, which is also the first liquid outlet concentration near the first emulsified liquid outlet 27. For the water pump 22 and the regulating valve 44, manual adjustment or automatic adjustment by the following controller can be adopted. The first flowmeter 43 generally can adopt a hand-adjustable float flowmeter for manual adjustment. In actual application, which component's opening degree is specifically adjusted to adjust the concentration of the emulsified liquid and whether to adopt manual adjustment or automatic adjustment by the controller are determined according to actual needs. Whether to set the regulating valve 44 and / or the first flowmeter 43 is also determined according to actual adjustment needs.

[0052] In some embodiments, referring to Figure 3 , when both a regulating valve 44 and a first flowmeter 43 are provided on the oil suction pipeline 4, and only the water pump 22 is used to pump water and the injector 31 is used to suck oil to prepare the emulsified liquid, and there is no need to adjust the concentration of the following emulsified liquid return liquid, the flow rate of the first flowmeter 43 can be manually adjusted only. After the concentration of the prepared emulsified liquid meets the requirements, the first flowmeter 43 can be maintained at this flow rate to continuously prepare the emulsified liquid; or the opening degree of the regulating valve 44 can be adjusted by using the controller to achieve the function of automatic monitoring and adjustment.

[0053] In some preferred embodiments, the automatic emulsion proportioning system further includes a controller; a first concentration meter 25 is also provided on the main pipeline 2 and between the first one-way valve 23 and the bypass pipeline 26. The controller is electrically connected to the water pump 22, the first concentration meter 25, and the regulating valve 44, and can adjust the opening of the water pump 22 and / or the opening of the regulating valve 44 according to the data detected by the first concentration meter 25. The regulating valve 44 is mainly used to achieve on-off and flow rate here, and an electric ball valve can be selected. In a specific embodiment, more preferably, the controller adjusts the opening of the regulating valve 44 according to the data detected by the first concentration meter 25.

[0054] Further, an oil inlet switch valve 41 and a filter 42 are sequentially provided on the oil suction pipeline 4 and close to the emulsion tank 5 along the liquid transportation direction (the regulating valve 44 and / or the first flow meter 43 are located between the injector 31 and the filter 42). The controller is also electrically connected to the oil inlet switch valve 41 to control the on-off between the emulsion tank 5 and the injector 31. The oil inlet switch valve 41 can be a ball valve, for example.

[0055] As needed, a second flow meter 24 can also be provided on the main pipeline 2 and between the first one-way valve 23 and the bypass pipeline 26. The controller is also electrically connected to the second flow meter 24. The data detected by the second flow meter 24 can be displayed on the corresponding display screen for the convenience of the staff to observe.

[0056] Since the emulsion return liquid from the fully-mechanized coal mining face will have its concentration reduced due to consumption when flowing through the face pipelines, hydraulic components, etc., generally the concentration of the emulsion return liquid is lower than 3%, and its concentration needs to be increased before reuse.

[0057] To facilitate increasing the concentration of the emulsion return liquid, a return liquid inlet joint 61 and an emulsion outlet joint 62 are connectable to the emulsion tank 6 in a switchable manner, and a second concentration meter 64 is connected to the emulsion tank 6. The controller is also electrically connected to the second concentration meter 64 and can adjust the concentration of the first liquid outlet near the first emulsion outlet according to the data detected by the second concentration meter 64, that is, adjust the opening of the water pump 22 and / or the opening of the regulating valve 44.

[0058] The whole system has an automatic oil-water proportioning working condition and an automatic return liquid proportioning working condition:

[0059] When the system is in the automatic oil-water proportioning working condition, only the water pump 22 is used to pump water and the injector 31 is used to suck oil to prepare the emulsion, and no emulsion return liquid enters the emulsion tank 6. In this working condition, both the return liquid inlet joint 61 and the emulsion outlet joint 62 are closed, and one of the first emulsion outlet 27 and the liquid outlet switch valve 261 is in the open state; when the oil-water mixing concentration is set manually at the control end, the water pump 22 starts to pump water from the inlet liquid tank 1, and the water flow is divided into two paths after passing through the water pump 22, which has been described in detail before and will not be elaborated here.

[0060] The liquid flowing through the branch where the first one-way valve 23 is located passes through the second flowmeter 24 and the first concentration meter 25. The first concentration meter 25 detects the concentration of the first liquid outlet near the first emulsion outlet 27 in real time and feeds it back to the controller. Then the liquid flows into the corresponding hydraulic support from the first emulsion outlet 27 or is stored in the emulsion tank 6 through the liquid outlet switching valve 261. During this process, when the concentration monitored by the first concentration meter 25 is less than the preset oil-water mixing concentration, the controller controls the regulating valve 44 to increase the opening amount or manually adjusts the flow rate of the first flowmeter 43 to increase the oil absorption amount; when the concentration monitored by the first concentration meter 25 is greater than the preset oil-water mixing concentration, the controller controls the regulating valve 44 to decrease the opening amount or manually adjusts the flow rate of the first flowmeter 43 to decrease the oil absorption amount. Through real-time monitoring and feedback control, finally the concentration after oil-water mixing (i.e., the concentration of the prepared emulsion) reaches the preset oil-water mixing concentration or the preset concentration range.

[0061] When the system is in the liquid return automatic proportioning working condition, there is emulsion liquid return entering the emulsion tank 6, and it is necessary to adjust the concentration of the emulsion liquid return. In this working condition, the liquid return inlet joint 61 is opened and connected to the emulsion liquid return pipeline, the emulsion liquid outlet joint 62 is opened (the outlet end of the emulsion liquid outlet joint 62 constitutes the second emulsion outlet), the liquid outlet switching valve 261 is opened, and the first emulsion outlet 27 is closed; after setting the preset liquid return concentration or concentration range manually at the control end, the water pump 22 is used to pump water and the injector 31 is used to absorb oil to prepare the emulsion, which flows into the emulsion tank 6 through the liquid outlet switching valve 261. The emulsion liquid return from the fully-mechanized coal face enters the emulsion tank 6 through the emulsion liquid return pipeline and the liquid return inlet joint 61 and is mixed with the emulsion flowing into the emulsion tank 6 through the liquid outlet switching valve 261. The second concentration meter 64 monitors the concentration near the second emulsion outlet in real time and feeds it back to the controller. When the concentration monitored by the second concentration meter 64 is less than the preset liquid return concentration or concentration range, the concentration of the emulsion after oil-water mixing is increased, and when the concentration monitored by the second concentration meter 64 is greater than the preset liquid return concentration or concentration range, the concentration of the emulsion after oil-water mixing is decreased. Through real-time monitoring and feedback control, finally the concentration at the second emulsion outlet reaches the preset liquid return concentration or concentration range.

[0062] In this embodiment, when the system is in the liquid return automatic proportioning working condition, instead of manually adjusting the first flowmeter 43, the controller automatically adjusts the opening degree of the regulating valve 44 and / or adjusts the opening degree of the water pump 22 according to the data detected by the second concentration meter 64 to adjust the concentration of the emulsion after oil-water mixing, and more accurately realizes the automatic proportioning adjustment of the liquid return concentration.

[0063] In some preferred embodiments, both the liquid return inlet joint 61 and the emulsion outlet joint 62 are connected to the bottom of the first side wall of the emulsion tank 6. One end of the liquid return inlet joint 61 extends into the emulsion tank 6 and communicates with the end of the bypass pipeline 26 extending into the emulsion tank 6 (i.e., the second end of the bypass pipeline 26).

[0064] Further preferably, referring to Figure 5 and Figure 6 , a baffle 65 is further provided at the bottom inside the emulsion tank 6. The first end of the baffle 65 is connected to the first side wall, and there is an interval area between the second end and the corresponding side wall of the emulsion tank 6. The baffle 65 divides the bottom area near the first side wall inside the emulsion tank 6 into a first area and a second area. The liquid return inlet joint 61 and the emulsion outlet joint 62 are respectively arranged facing the first area and the second area.

[0065] The injection position of the emulsion after oil-water mixing, the liquid return inlet position, and the second emulsion outlet position will directly affect the automatic liquid return ratio effect. Referring to Figure 5 , both the liquid return inlet joint 61 and the emulsion outlet joint 62 are arranged close to the bottom. The outlet end of the bypass pipeline 26 is directly communicated with the liquid return inlet joint 61, which is beneficial to the full and uniform mixing of the low-concentration liquid return and the high-concentration emulsion after oil-water mixing. Moreover, a baffle 65 is added between the liquid return inlet joint 61 and the emulsion outlet joint 62 as a fluid guide, which further promotes the full mixing of the liquid return and the emulsion. Moreover, the baffle 65 can effectively prevent the low-concentration liquid return from directly flowing to the second emulsion outlet, avoiding problems such as large fluctuations in concentration at the concentration monitoring position and ineffective replenishment of the liquid return concentration.

[0066] Generally, the plate surface of the baffle 65 is vertically arranged, and it can also be inclined according to needs. The shape of the emulsion tank 6 is determined according to needs. For example, in a specific embodiment, the emulsion tank 6 is a rectangular box body, and its side walls are sequentially connected and surrounded by a first side wall, a second side wall, a third side wall, and a fourth side wall. The first side wall and the third side wall are relatively arranged, and the second side wall and the fourth side wall are relatively arranged. The first end of the baffle 65 is connected to the first side wall, and there is an interval area between the second end and the third side wall. The area between the first side wall, the baffle 65, and the second side wall forms the first area, and the area between the first side wall, the baffle 65, and the fourth side wall forms the second area. When the emulsion after oil-water mixing is injected into the emulsion tank 6 through the bypass pipeline 26, it first mixes with the emulsion liquid return transported through the liquid return inlet joint 61, then enters the first area, flows through the interval area to the second area, and then flows out through the emulsion outlet joint 62.

[0067] Further, the part of the baffle 65 close to its second end is inclined towards the second area and forms an inclined deflector 651 to play a better guiding role.

[0068] Further preferably, referring toFigures 5 to 8 Outside the emulsion tank 6, there is also an external pipeline 63. Both ends of the external pipeline 63 extend into the emulsion tank 6. The first end of the external pipeline 63 is located in the second area and is arranged close to the inlet end of the emulsion outlet joint 62, and the second end is arranged far from the inlet end of the emulsion outlet joint 62 (the second end of the external pipeline 63 can be located in the second area according to needs, or can be located in the first area or the above-mentioned interval area). The second concentration meter 64 is located outside the emulsion tank 6 and is connected to the external pipeline 63.

[0069] The second concentration meter 64 is mainly used to detect the concentration near the second emulsion outlet. By setting the external pipeline 63 and arranging the second concentration meter 64 outside the emulsion tank 6, the liquid in the emulsion tank 6 can be led outside the tank and the concentration can be detected outside the tank, which is beneficial to the installation and cleaning of the second concentration meter 64, and it is more convenient to clean the mirror surface of the concentration meter to ensure more accurate concentration testing.

[0070] In an optional embodiment, only the second concentration meter 64 is provided on the external pipeline 63, and the circulation pump 66 is not provided. As Figure 7 shown, due to the high speed and low pressure at the second emulsion outlet, and the low speed and high pressure in the emulsion tank 6, the emulsion flows from high pressure to low pressure in the external pipeline 63, that is, the emulsion will flow from the second end of the external pipeline 63 to the first end, and the concentration near the second emulsion outlet can be measured.

[0071] In a preferred embodiment, as Figure 8 shown, a circulation pump 66 is also connected to the external pipeline 63, so that the liquid in the emulsion tank 6 enters from the first end of the external pipeline 63 and flows back into the emulsion tank 6 through the second end. The setting of the circulation pump 66 can make the liquid flow from the first end of the external pipeline 63 to the second end, and the detected concentration is closer to the concentration at the second emulsion outlet, with higher accuracy.

[0072] Furthermore, referring to Figure 4 , a reversing valve 21 is also provided on the main pipeline 2 and between the water inlet tank 1 and the water pump 22. The emulsion tank 6 is also connected to the reversing valve 21 through a conversion pipeline 7. The reversing valve 21 can connect the water pump 22 to the water inlet tank 1 or to the emulsion tank 6.

[0073] When the amount of the emulsified liquid after mixing oil and water replenished in the emulsion tank 6 is too much, and the amount of the emulsified liquid extracted from the second emulsion outlet is less, it is easy to cause the emulsion tank 6 to be filled, and the situation where the return liquid concentration cannot be replenished. At this time, the clear water pumped into the water inlet tank 1 by the water pump 22 can be converted into the emulsified liquid in the emulsion tank 6 through the reversing valve 21, thereby avoiding the situation that the emulsion tank 6 is filled and the return liquid concentration cannot be replenished.

[0074] The emulsion tank 6 is also connected with a first liquid level gauge 67. The controller is also electrically connected to the first liquid level gauge 67 and the reversing valve 21, and can control the reversing of the reversing valve 21 to connect the water pump 22 with the emulsion tank 6 when the liquid level in the emulsion tank 6 is greater than the preset emulsion liquid level value. The reversing valve 21 can adopt a two-position three-way solenoid valve.

[0075] Further, referring to Figure 3 , the emulsion automatic proportioning system further includes a water inlet assembly 11, an oil pumping assembly 51, an emulsion oil barrel 52, a second liquid level gauge 12 and a third liquid level gauge 53. The second liquid level gauge 12 is used to detect the liquid level in the water inlet tank 1, and the third liquid level gauge 53 is used to detect the liquid in the emulsion oil tank 5. The emulsion oil barrel 52 is a commercial emulsion oil barrel; the controller is also electrically connected to the water inlet assembly 11, the oil pumping assembly 51, the second liquid level gauge 12 and the third liquid level gauge 53, and can control the water inlet assembly 11 to act to replenish water into the water inlet tank 1 when the liquid level in the water inlet tank 1 is lower than the preset water level value, and can also control the oil pumping assembly 51 to act when the liquid level in the emulsion oil tank 5 is lower than the preset emulsion oil level value, and replenish the emulsion oil in the emulsion oil barrel 52 into the emulsion oil tank 5. The water inlet assembly 11 includes a filter, a pressure reducing valve, a float valve, etc., and water enters the water inlet tank 1 after passing through the water inlet assembly 11.

[0076] Further, the present application also provides an emulsion automatic proportioning method, including:

[0077] Using the water pump 22 to pump water from the water inlet tank 1, and dividing the fluid after passing through the water pump 22 into a first branch and a second branch. The fluid in the first branch flows through the first one-way valve 23 and then flows to the first emulsion outlet 27 or flows to the emulsion tank 6. The fluid in the second branch enters the jet pump 31 to suck oil after passing through the second one-way valve 32. The water-oil liquid after mixing by the jet pump 31 can return to the inlet of the water pump 22 and be mixed with the water pumped out by the water pump 22 again.

[0078] This method adopts the way of connecting the jet pump 31 and the water pump 22 in parallel to mix oil and water, and realizes the precise proportioning control of the emulsion concentration.

[0079] More specifically, in order to facilitate the precise adjustment of the concentration of the oil-water mixture, the emulsion automatic proportioning method further includes:

[0080] Real-time detecting the concentration of the first liquid outlet near the first emulsion outlet 27 on the first branch;

[0081] Comparing the concentration of the first liquid outlet with the preset oil-water mixing concentration;

[0082] When the concentration of the first liquid outlet is less than the preset oil-water mixing concentration, the oil suction amount at the jet pump 31 is increased and / or the opening degree of the water pump 22 is decreased;

[0083] When the concentration of the first liquid outlet is greater than the preset oil-water mixture concentration, the oil absorption amount at the ejector 31 is reduced and / or the opening degree of the water pump 22 is increased.

[0084] Further, for facilitating the adjustment of the concentration of the emulsified liquid return, the automatic emulsified liquid proportioning method further includes:

[0085] The emulsified liquid return is introduced into the emulsified liquid tank 6, so that the emulsified liquid return is mixed with the emulsified liquid flowing into the emulsified liquid tank 6 after passing through the first one-way valve 23 and flows out through the second emulsified liquid outlet on the emulsified liquid tank 6;

[0086] The concentration of the second liquid outlet near the second emulsified liquid outlet in the emulsified liquid tank 6 is detected in real time;

[0087] The concentration of the second liquid outlet is compared with the preset return liquid concentration;

[0088] When the concentration of the second liquid outlet is less than the preset return liquid concentration, the concentration of the first liquid outlet is increased;

[0089] When the concentration of the second liquid outlet is greater than the preset return liquid concentration, the concentration of the first liquid outlet is reduced.

[0090] Further, to avoid the return liquid concentration being unable to be replenished due to excessive oil-water mixed emulsified liquid being replenished in the emulsified liquid tank 6, the automatic emulsified liquid proportioning method further includes:

[0091] The liquid level in the emulsified liquid tank 6 is detected in real time;

[0092] The liquid level in the emulsified liquid tank 6 is compared with the preset emulsified liquid level value;

[0093] When the liquid level in the emulsified liquid tank 6 is greater than the preset emulsified liquid level value, the connection between the water pump 22 and the inlet liquid tank 1 is cut off and the emulsified liquid tank 6 is connected to the water pump 22.

[0094] The whole method can be implemented by using the above-mentioned automatic emulsified liquid proportioning system. The above-mentioned first branch specifically refers to the part of the main pipeline 2 behind the water pump 22, and the second branch refers to the above-mentioned parallel pipeline 3.

[0095] In summary, the automatic emulsified liquid proportioning system and method in this embodiment have the following advantages:

[0096] (1) The entire system has an automatic oil-water ratio working condition and an automatic return liquid ratio working condition, achieving precise control of the concentration of mine emulsion. When the system is in the automatic oil-water ratio working condition, by connecting the injector 31 in parallel with the water pump 22, the flow rate into the injector 31 is reduced, thereby reducing the amount of emulsified oil sucked, making the concentration fluctuation range of the emulsion after oil-water mixing small. Further, it is compared with the preset oil-water mixing concentration and fed back in real time, and then precise ratio control of the emulsion concentration after oil-water mixing is achieved. Finally, the proportioned emulsion flows out from the first emulsion outlet 27 or is stored in the emulsion tank 6. When the system is in the automatic return liquid ratio working condition, the return liquid is connected to the emulsion tank 6, mixed with the emulsion in the emulsion tank 6, and the concentration at the outlet of the emulsion tank 6 is monitored in real time by using an external pipeline 63. Then, it is compared with the preset return liquid concentration, and the concentration of the oil-water automatically proportioned liquid input into the emulsion tank 6 is feedback-controlled to achieve precise ratio control of the emulsion concentration of the return liquid. The entire system not only realizes precise ratio control of the concentration of the oil-water mixed emulsion, achieves precise ratio control of the concentration of mine emulsion, but also realizes precise ratio control of the concentration of the return liquid emulsion, which is beneficial to the performance and service life of coal mine support equipment and the safe and reliable production of the working face.

[0097] (2) Through the reversing valve 21, the clear water pumped into the water tank 1 by the water pump 22 can be converted into the emulsion in the emulsion tank 6, avoiding the problem that the emulsion tank 6 is filled with the emulsion after excessive oil-water mixing, resulting in the inability to supplement the return liquid concentration.

[0098] (3) Making the inlet of the emulsion after oil-water mixing (i.e., the outlet end of the bypass pipeline 26) directly communicate with the return liquid inlet joint 61 is beneficial for the low-concentration return liquid to be fully and evenly mixed with the high-concentration emulsion after oil-water mixing. And a baffle 65 is added between the return liquid inlet joint 61 and the emulsion outlet joint 62 as a fluid guide to further promote the full and even mixing of the return liquid and the emulsion. Moreover, the baffle 65 can effectively prevent the low-concentration return liquid from directly flowing to the emulsion outlet joint 62, avoiding problems such as large fluctuations in the concentration at the concentration monitoring position and the inability to effectively supplement the return liquid concentration.

[0099] (4) Monitoring the concentration near the second emulsion outlet by using an external pipeline 63 realizes real-time monitoring of the concentration at the outlet of the emulsion tank 6, and this method is beneficial for the installation and cleaning of the concentration meter.

[0100] The above is only a schematic specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An automatic emulsion proportioning system, characterized in that: It includes water inlet tank, main pipe, parallel pipe, oil suction pipe, emulsified oil tank and emulsified liquid tank; The inlet end of the main pipeline is connected to the water inlet tank, and a water pump, a first one-way valve and a bypass pipeline are sequentially arranged on the main pipeline along the liquid conveying direction, and the two ends of the parallel pipeline are respectively connected to the main pipelines at the two ends of the water pump, and an ejector and a second one-way valve are arranged on the parallel pipeline, and the second one-way valve is arranged close to the outlet end of the water pump and can make the liquid flow unidirectionally from the outlet end of the water pump to the inlet end of the ejector; the inlet end and the outlet end of the oil suction pipeline can be connected to the emulsified oil tank and the negative pressure port of the ejector respectively, and the bypass pipeline can be connected to the emulsion tank.

2. The automatic emulsion proportioning system according to claim 1, characterized in that: A regulating valve and / or a first flow meter is provided on the oil suction pipeline. The concentration of the emulsion obtained after passing through the first one-way valve can be adjusted by changing the opening of the water pump, the opening of the regulating valve and / or the flow of the first flow meter.

3. The automatic emulsion proportioning system according to claim 2, characterized in that: The automatic emulsion proportioning system also includes a controller; A first concentration meter is also provided on the main line and between the first one-way valve and the bypass line. The controller is electrically connected to the water pump, the first concentration meter and the regulating valve, and can adjust the opening of the water pump and / or the opening of the regulating valve according to data detected by the first concentration meter.

4. The automatic emulsion proportioning system according to claim 3, characterized in that: An oil inlet switch valve and a filter are sequentially arranged on the oil suction pipeline and near the emulsified oil tank along the liquid delivery direction. A second flow meter is also arranged on the main pipeline and between the first one-way valve and the bypass pipeline. The controller is also electrically connected to the oil inlet switch valve and the second flow meter.

5. The automatic emulsion proportioning system according to claim 3, characterized in that: The emulsion tank can also be connected to a return liquid inlet joint and an emulsion outlet joint in an on-off manner, and a second concentration meter is connected to the emulsion tank. The controller is also electrically connected to the second concentration meter and can adjust the opening of the water pump and / or the opening of the regulating valve according to the data detected by the second concentration meter.

6. The automatic emulsion proportioning system according to claim 5, characterized in that: The liquid return inlet joint and the emulsion outlet joint are both connected to the bottom of the first side wall of the emulsion tank, and one end of the liquid return inlet joint extends into the emulsion tank and communicates with the end of the bypass pipeline extending into the emulsion tank.

7. The automatic emulsion proportioning system according to claim 6, characterized in that: A baffle is also provided at the bottom of the emulsion tank, wherein the first end of the baffle is connected to the first side wall, and a spacing area is left between the second end and the corresponding side wall of the emulsion tank. The baffle divides the bottom area of ​​the emulsion tank close to the first side wall into a first area and a second area, and the return liquid inlet joint and the emulsion outlet joint are respectively arranged opposite to the first area and the second area.

8. The automatic emulsion proportioning system according to claim 7, characterized in that: A portion of the baffle plate close to the second end thereof is inclined toward the second region and constitutes an inclined guide plate.

9. The automatic emulsion proportioning system according to claim 7, characterized in that: An external pipe is also provided outside the emulsion tank, both ends of the external pipe extend into the emulsion tank, and the first end of the external pipe is located in the second area and arranged close to the inlet end of the emulsion outlet joint, and the second end is arranged away from the inlet end of the emulsion outlet joint. The second concentration meter is located outside the emulsion tank and connected to the external pipe.

10. The automatic emulsion proportioning system according to claim 9, characterized in that: The external pipe is also connected with a circulation pump, so that the liquid in the emulsion tank enters from the first end of the external pipe and flows back into the emulsion tank through the second end.

11. The automatic emulsion proportioning system according to claim 5, characterized in that: A reversing valve is also provided on the main line and between the water inlet tank and the water pump. The emulsion tank is also connected to the reversing valve via a conversion pipeline. The reversing valve can connect the water pump to the water inlet tank or to the emulsion tank.

12. The automatic emulsion proportioning system according to claim 11, characterized in that: The emulsion tank is also connected to a first liquid level meter, and the controller is also electrically connected to the first liquid level meter and the reversing valve, and can control the reversing valve to connect the water pump to the emulsion tank when the liquid level in the emulsion tank is greater than a preset emulsion level value.

13. An automatic emulsion proportioning method, characterized in that: include: A water pump is used to pump water from the water inlet tank, and the fluid after passing through the water pump is divided into a first branch and a second branch. The fluid in the first branch flows to the first emulsion outlet or to the emulsion tank after passing through a first one-way valve, and the fluid in the second branch enters the ejector to absorb oil after passing through a second one-way valve. The water-oil liquid mixed by the ejector can return to the inlet of the water pump and mix again with the water pumped out by the water pump.

14. The automatic emulsion proportioning method according to claim 13, characterized in that: The automatic emulsion proportioning method also includes: Real-time detection of the first liquid outlet concentration on the first branch near the first emulsion outlet; comparing the first liquid outlet concentration with a preset oil-water mixture concentration; When the first liquid outlet concentration is less than the preset oil-water mixture concentration, the oil absorption amount at the ejector is increased and / or the opening of the water pump is reduced; When the first liquid outlet concentration is greater than the preset oil-water mixture concentration, the oil suction amount at the ejector is reduced and / or the opening of the water pump is increased.

15. The automatic emulsion proportioning method according to claim 14, characterized in that: The automatic emulsion proportioning method also includes: Passing the emulsion return liquid into the emulsion tank, so that the emulsion return liquid is mixed with the emulsion flowing into the emulsion tank after passing through the first one-way valve and flows out through the second emulsion outlet on the emulsion tank; Real-time detection of the second liquid outlet concentration near the second emulsion outlet in the emulsion tank; comparing the second liquid outlet concentration with a preset liquid return concentration; When the second liquid outlet concentration is less than the preset liquid return concentration, increasing the first liquid outlet concentration; When the second liquid outlet concentration is greater than the preset liquid return concentration, the first liquid outlet concentration is reduced.

16. The automatic emulsion proportioning method according to claim 14, characterized in that: The automatic emulsion proportioning method also includes: Real-time detection of the liquid level in the emulsion tank; comparing the liquid level in the emulsion tank with a preset emulsion liquid level value; When the liquid level in the emulsion tank is greater than the preset emulsion level value, the connection between the water pump and the water inlet tank is cut off and the emulsion tank is connected to the water pump.

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