Industrial hydrocyclone pressure stability control system and method

Abstract

An industrial hydrocyclone pressure stability control system and method. The industrial hydrocyclone pressure stability control system comprises a hydrocyclone (10), a grinding apparatus (20), a hydrocyclone feed pump pool (30) and a variable-frequency slurry pump (40), wherein an underflow pipe (11) of the hydrocyclone (10) is connected to the grinding apparatus (20), the grinding apparatus (20) is connected to the hydrocyclone feed pump pool (30), and the hydrocyclone feed pump pool (30) is connected to the variable-frequency slurry pump (40); and the hydrocyclone (10) is provided with a pressure sensor (50).

Description

An industrial hydrocyclone pressure stabilizing control system and control method TECHNICAL FIELD

[0001] The present application belongs to the field of mine equipment, and particularly relates to an industrial hydrocyclone pressure stabilizing control system and control method. BACKGROUND

[0002] In the mineral processing industry, whether non-ferrous metals or ferrous metals and non-metal industries, water is usually used as a medium for grinding classification and separation operation. In the grinding classification system, cyclone, high-frequency fine screen and spiral classifier are usually used as classification equipment. Cyclone is the most commonly used equipment. Hydrocyclone is a multiphase separation device for separating non-uniform phase mixtures. Its structure is usually a combination of a cylinder and a cone. The incoming material enters the cylinder along the tangent. Under the action of centrifugal force, the heavy component rotates downward, and the light component descends to a certain position and is discharged from the top with overflow, thus completing the separation of light and heavy components. The device has the advantages of simple structure, easy operation, no moving parts, small footprint, large handling capacity and high separation efficiency. These advantages make hydrocyclone have a wide application market in the fields of coal separation, petroleum and chemical industry. At present, the research on cyclone classification mainly focuses on the optimization of structural parameters, simulation of internal flow field and expansion of application technology. Although the performance of hydrocyclone is determined by structural parameters, operating parameters and feed properties, the classification performance is mainly related to operating parameters and feed properties after the process flow and equipment facilities are fixed. The feed properties mainly refer to the density and particle size composition of the treated material. In actual production process, the feed properties usually fluctuate with the change of mineral characteristics or the working state of the previous operation, causing the feed pressure of hydrocyclone to be unstable, leading to the classification performance of hydrocyclone, and thus adversely affecting the subsequent separation or reclassification operation.

[0003] At present, the existing cyclone pressure automatic control system usually adopts PID mode for adjustment. Its basic mode is that when the actual liquid level is lower than the set liquid level, the valve continuously increases the opening degree until it stops opening, but the inertia of the added water makes the liquid level still rise, and the valve starts to close when it exceeds the dead zone. The liquid level fluctuates back and forth, causing large fluctuations in the pressure of the cyclone. The PID of the frequency converter for controlling the pressure of the cyclone also has the problem of oscillation, which makes it difficult to match the parameters.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] In order to cope with the change of material, reduce the pressure fluctuation of the cyclone, reduce the operation cost of the cyclone, improve the classification efficiency of the cyclone, enhance the efficiency of the rear-end separation operation and the re-classification operation, maximize the processing capacity, and improve the comprehensive benefit of the concentrator, the application provides an industrial hydrocyclone pressure stabilizing control system and a control method.

[0006] The application comprises the following technical solutions:

[0007] The first aspect of the application provides an industrial hydrocyclone pressure stabilizing control system, which comprises a hydrocyclone, a grinding device, a cyclone feed pump pool and a variable frequency slurry pump, the sand pipe of the hydrocyclone is connected with the grinding device, the grinding device is connected with the cyclone feed pump pool, and the cyclone feed pump pool is connected with the variable frequency slurry pump; the hydrocyclone is provided with a pressure sensor.

[0008] Further, the cyclone feed pump pool is provided with a liquid level sensor, a feed pipe and a pump pool water filling pipe, and a water filling valve is arranged on the pump pool water filling pipe.

[0009] Further, the variable frequency slurry pump is connected with the cyclone feed pump pool through a slurry pipe; the slurry pipe inlet is located below the pump pool water filling pipe outlet.

[0010] Further, the pump pool water filling pipe outlet is located 200-300 mm above and 200-300 mm in front of the slurry pipe inlet; and the slurry pipe is coincided with the center line of the variable frequency slurry pump inlet.

[0011] The second aspect of the application provides an industrial hydrocyclone pressure stabilizing control method, which comprises the control system described above, and the control method comprises the following steps:

[0012] acquiring the pressure value of the pressure sensor within a first preset time, and obtaining the average value P of the pressure value within the first preset time avg1 ;

[0013] acquiring the pressure value of the pressure sensor within a previous first preset time, and obtaining the average value P of the pressure value within the previous first preset time avg2 ;

[0014] if the average value P avg1 is located in the pressure adjustment dead zone, the frequency of the variable frequency slurry pump is kept unchanged;

[0015] if the average value P avg1 is greater than the pressure adjustment dead zone, and the average value P avg1 is greater than the average value P avg2 , the frequency of the variable frequency slurry pump is reduced;

[0016] If the average value P avg1 Less than the pressure adjustment dead zone, and the average value P avg1 Less than the average value P avg2 This increases the frequency of the variable frequency slurry pump.

[0017] Furthermore, the adjustment range of the variable frequency slurry pump is 0.1 to 0.5 Hz.

[0018] Furthermore, the pressure sensor continuously acquires pressure data every second to obtain a pressure value P. N , where P N ∈(P1,P2,P3,...,P n ), P n This represents the pressure value at the nth second.

[0019] If the first preset time is QS, then:

[0020] A third aspect of the present invention provides a method for stabilizing pressure control of an industrial hydrocyclone, comprising the control system described above and the control method described above, wherein the control method further comprises:

[0021] Obtain the liquid level value of the liquid level sensor within a second preset time period, and obtain the average value L of the liquid level value within the second preset time period. avg1 ;

[0022] Obtain the liquid level value of the liquid level sensor within the previous second preset time period, and obtain the average value L of the liquid level value within the previous first preset time period. avg2 ;

[0023] If the average value L avg1 If the liquid level adjustment dead zone is located, the opening of the water supply valve should remain unchanged;

[0024] If the average value L avg1 The value L is greater than the liquid level adjustment dead zone. avg1 Greater than the average value L avg2 If so, reduce the opening of the water supply valve;

[0025] If the average value L avg1 The value L is less than the liquid level adjustment dead zone. avg1 Less than the average value L avg2 If so, increase the opening of the water supply valve.

[0026] Furthermore, in the average value L avg1 The value L is greater than the liquid level adjustment dead zone. avg1 Greater than the average value L avg2 When the opening of the water supply valve is reduced:

[0027] If the average value L avg1 If the average value L

[0028] If the average value L avg1 If the average value L

[0029] If the average value L

[0030] If the average value L avg1 If the average value L avg1 If the average value L avg2 If the average value L

[0031] If the average value L avg1 If the average value L

[0032] If the average value L avg1 If the average value L

[0033] If the average value L

[0034] Further, the total height of the cyclone feeding pump pool is H m, and the liquid adjustment dead zone is H / 2~3H / 4 m.

[0035] By adopting the technical scheme, the present application has the following advantages:

[0036] 1. The present application can cope with material changes, reduce cyclone pressure fluctuation, reduce the influence of classification accuracy, reduce the operating cost of the cyclone, maximize the processing capacity, enhance the efficiency of the rear-end separation operation and re-classification operation, and improve the comprehensive benefits of the concentrator.

[0037] 2. The setting of the pressure adjustment dead zone can avoid frequent adjustment of the frequency of the frequency conversion slurry pump caused by the comparison between the actual monitoring pressure value and the set pressure value, effectively maintain the sensitivity of the monitoring equipment, prolong the effective operation time of the equipment, and also reduce the frequent adjustment caused by the monitoring system error.

[0038] 3、The present application can judge the pressure rising rate of the hydrocyclone by comparing the pressure value every 5 seconds, and the frequency of the slurry pump is adjusted synchronously (the adjustment is 0.3% opening every time, and the optimal interval is 0.1%-1%), so that the pressure adjustment of the hydrocyclone is timely and targeted, the pressure fluctuation is avoided, and the stability of the pressure is improved.

[0039] 4、The liquid level adjustment dead zone of the present application can avoid the comparison between the actual monitoring liquid level value and the set liquid level value, avoid the adjustment of the water valve opening at all times, effectively maintain the sensitivity of the monitoring equipment, prolong the effective operation time of the equipment, reduce the frequent adjustment caused by the monitoring system error, and overcome the adverse effects caused by the fluctuation of the incoming material concentration in the production process.

[0040] 5、The present application can judge the rising rate of the hydrocyclone by comparing the liquid level value every 5 seconds, and the frequency of the slurry pump is adjusted synchronously (the adjustment is 0.1 Hz every time, and the optimal interval is 0.1-0.5 Hz), so that the liquid level adjustment of the hydrocyclone is timely and targeted, the liquid level fluctuation is avoided, and the stability of the liquid level is improved.

[0041] 6、The present application sets the liquid level adjustment dead zone of the hydrocyclone feeding pump pool to be 1 / 2-3 / 4 of the height of the pump pool, so that the pump pool is prevented from being emptied and the overflow of the slurry, and the storage and buffering of the hydrocyclone feeding pump pool are fully released.

[0042] 7、The present application sets the outlet of the water adding pipe to be 200-300 mm above and 200-300 mm in front of the inlet of the slurry pipe, and the center lines of the inlet of the slurry pipe and the frequency conversion slurry pump are coincided, so that the uneven or accumulation of the slurry at the inlet of the slurry pump is avoided.

[0043] 8、The present application overcomes the adverse effects caused by the fluctuation of the incoming material and the monitoring in the production process by scientifically collecting system data, designing the pressure adjustment dead zone and the liquid level adjustment dead zone, and makes the pressure of the hydrocyclone more stable.

[0044] 9、The present application has higher adjustment efficiency and adjustment effect by adjusting the frequency of the frequency conversion slurry pump and the liquid level of the hydrocyclone feeding pump pool at the same time.

[0045] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative work based on these drawings also belong to the protection scope of the present application.

[0047] Fig. 1 is a structural schematic diagram of an industrial hydrocyclone pressure stable control system in an embodiment of the present application.

[0048] Fig. 2 is a partial structural schematic diagram of Fig. 1.

[0049] Fig. 3 is a liquid level partition adjustment schematic diagram of a cyclone feed pump pool in an embodiment of the present application.

[0050] In the drawings: 10-hydrocyclone, 11-sand pipe, 12-overflow pipe, 20-grinding equipment, 30-cyclone feed pump pool, 40-variable frequency slurry pump, 50-pressure sensor, 60-liquid level sensor, 70-feeding pipe, 80-pump pool water adding pipe 80, 81-pump pool water adding pipe 80 outlet, 90-water adding valve, 100-ore pulp pipe, 101-ore pulp pipe inlet. DETAILED DESCRIPTION

[0051] The following description provides many different embodiments, or examples, for implementing different features of the application. Specific examples are described in the following description to provide a thorough explanation of the application. These examples can be combined with each other, other implementations of the application can be used, and the description is not limited to the examples described.

[0052] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0053] The present embodiment provides an industrial hydrocyclone pressure stable control system, as shown in Fig. 1, which comprises a hydrocyclone 10, grinding equipment 20, a cyclone feed pump pool 30 and a variable frequency slurry pump 40. The hydrocyclone 10 comprises a sand pipe 11 and an overflow pipe 12. The grinding equipment 20 comprises a tower mill. The sand pipe 11 of the hydrocyclone 10 is connected to the grinding equipment 20. The grinding equipment 20 is connected to the cyclone feed pump pool 30. The cyclone feed pump pool 30 is connected to the variable frequency slurry pump 40. The hydrocyclone 10 is provided with a pressure sensor 50.

[0054] Further, as shown in Fig. 1, the cyclone feed pump tank 30 is provided with a liquid level sensor 60, a feed pipe 70 and a pump tank water filling pipe 80 provided with a water filling valve 90.

[0055] Further, as shown in Fig. 1, the variable frequency slurry pump 40 is connected to the cyclone feed pump tank 30 through a slurry pipe 100, and the slurry pipe inlet 101 is located below the pump tank water filling pipe outlet 81.

[0056] Further, the pump tank water filling pipe outlet 81 is located 200-300 mm above and 200-300 mm in front of the slurry pipe inlet 101, and the slurry pipe 100 coincides with the center line of the variable frequency slurry pump 40 inlet. As shown in Fig. 2, A represents the distance between the pump tank water filling pipe outlet 81 and the slurry pipe inlet 101, i.e. A = 200-300 mm; B represents the distance between the pump tank water filling pipe outlet 81 and the slurry pipe inlet 101, i.e. B = 200-300 mm.

[0057] The embodiment also provides an industrial hydrocyclone pressure stabilizing control method, comprising the control system described above, and the control method comprises the following steps:

[0058] obtaining the pressure value of the pressure sensor 50 within a first preset time, and obtaining the average value P of the pressure value within the first preset time avg1 ;

[0059] obtaining the pressure value of the pressure sensor 50 within a previous first preset time, and obtaining the average value P of the pressure value within the previous first preset time avg2 ;

[0060] if the average value P avg1 is located in the pressure adjustment dead zone, the frequency of the variable frequency slurry pump 40 remains unchanged;

[0061] if the average value P avg1 is greater than the pressure adjustment dead zone, and the average value P avg1 is greater than the average value P avg2 , the frequency of the variable frequency slurry pump 40 is reduced;

[0062] if the average value P avg1 is less than the pressure adjustment dead zone, and the average value P avg1 is less than the average value P avg2 , the frequency of the variable frequency slurry pump 40 is increased.

[0063] Further, the pressure adjustment dead zone is Y±1-4KPa. ±1-4KPa should be understood as an up-down floating interval, that is, the maximum interval of up-down floating is [-4, 4], and the minimum interval of up-down floating is [-1, 1]. Preferably, the pressure adjustment dead zone is Y±2KPa.

[0064] Further, the pressure sensor 50 continuously collects pressure every second to obtain a pressure value P N , wherein P N ∈(P1, P2, P3,..., P n ), P n represents the pressure value of the nth second.

[0065] The first preset time is Q S, and the following conditions are met:

[0066] Further, the first preset time is 3-15 S.

[0067] Preferably, the first preset time is 5 S, After obtaining P avg1 , the adjustment strategy of the variable frequency slurry pump 40 is obtained through P avg1 , and the variable frequency slurry pump 40 is adjusted once.

[0068] Further, the adjustment range of the variable frequency slurry pump 40 is 0.1-0.5 Hz, that is, the frequency of the variable frequency slurry pump 40 is adjusted by 0.1-0.5 Hz each time. Preferably, the variable frequency slurry pump 40 is adjusted by 0.1 Hz each time.

[0069] The setting of the pressure adjustment dead zone can avoid frequent adjustment of the slurry pump frequency caused by comparison of the actual monitoring pressure value and the set pressure value, effectively maintain the sensitivity of the monitoring equipment, prolong the effective operation time of the equipment, and also reduce the frequent adjustment caused by monitoring system error; comparison of the pressure value every 5 seconds greatly improves the timeliness and pertinence of the pressure adjustment of the variable frequency slurry pump 40, and avoids large fluctuations in pressure, which is conducive to the stability of the pressure.

[0070] The size of the pressure of the hydrocyclone 10 mainly depends on the size of the operating frequency of the variable frequency slurry pump 40, but when the liquid level of the cyclone feed pump pool 30 fluctuates, even if the frequency of the variable frequency slurry pump 40 does not change, the pressure of the hydrocyclone 10 will also fluctuate. Therefore, a stable liquid level of the cyclone feed pump pool 30 is also very important for pressure stability control.

[0071] The embodiment also provides an industrial hydrocyclone pressure stability control method, which comprises the control system and the control method described above, and the control method further comprises the following steps:

[0072] acquire the liquid level value of the liquid level sensor 60 within a second preset time, and obtain the average value L of the liquid level value within the second preset time avg1 ;

[0073] acquire the liquid level value of the liquid level sensor 60 within a previous second preset time, and obtain the average value L of the liquid level value within the previous first preset time avg2 ;

[0074] if the average value L avg1 is located within the liquid level adjustment dead zone, keep the opening degree of the water adding valve 90 unchanged;

[0075] if the average value L avg1 is greater than the liquid level adjustment dead zone, and the average value L avg1 is greater than the average value L avg2 , decrease the opening degree of the water adding valve 90;

[0076] if the average value L avg1 is less than the liquid level adjustment dead zone, and the average value L avg1 is less than the average value L avg2 , increase the opening degree of the water adding valve 90.

[0077] Further, as shown in FIG. 3, when the average value L avg1 is greater than the liquid level adjustment dead zone, and the average value L avg1 is greater than the average value L avg2 , the opening degree of the water adding valve 90 is decreased:

[0078] if the average value L avg1 is located within the first liquid level slow adjustment zone, the opening degree of the water adding valve 90 is decreased by 0.1-0.5% of the full opening degree of the water adding valve 90;

[0079] if the average value L avg1 is located within the first liquid level fast adjustment zone, the opening degree of the water adding valve 90 is decreased by 0.2-1% of the full opening degree of the water adding valve 90;

[0080] wherein the liquid level adjustment dead zone < the first liquid level slow adjustment zone < the first liquid level fast adjustment zone;

[0081] and / or when the average value L avg1 is less than the liquid level adjustment dead zone, and the average value L avg1 is less than the average value L avg2 , the opening degree of the water adding valve 90 is increased:

[0082] if the average value L avg1 is located within the second liquid level slow adjustment zone, the opening degree of the water adding valve 90 is increased by 0.1-0.5% of the full opening degree of the water adding valve 90;

[0083] If the average value L avg1 If the liquid level is in the second liquid level fast adjustment area, the water feeding valve 90 is adjusted by 0.2-1% of the full opening degree.

[0084] The second liquid level fast adjustment area is smaller than the second liquid level slow adjustment area, and the liquid level adjustment dead zone.

[0085] The liquid level fast adjustment area and the liquid level slow adjustment area and the water feeding valve 90 adjustment range can make the adjustment more stable, so that the pressure fluctuation is small, thereby improving the classification efficiency of the cyclone.

[0086] Further, the second preset time is 4S, and the liquid level sensor 60 collects the liquid level every second to obtain the pressure value L M , wherein P M ∈(P1,P2,P3,...,P m ), P m represents the pressure value of the mth second. After obtaining L avg1 , the adjustment strategy of the water feeding valve 90 is obtained through L avg1 , and the water feeding valve 90 is adjusted once.

[0087] Further, the total height of the cyclone feed pump pool 30 is H m, and the liquid level adjustment dead zone is H / 2-3H / 4 m.

[0088] Further, as shown in FIG. 3, the total height of the cyclone feed pump pool 30 is 5 m, and the liquid level adjustment dead zone is 2.8-3.0 m.

[0089] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features.

[0090] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between multiple elements or the interaction relationship between multiple elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0091] In the description of the application, it should be understood that all the terms used to indicate the position or positional relationship are based on the position or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular position, be constructed and operated in a particular position, and cannot be understood as a limitation on the application.

[0092] Although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. An industrial hydrocyclone pressure stabilisation control system characterised in that, The control system comprises a hydrocyclone (10), a grinding device (20), a cyclone feed pump pool (30) and a variable frequency slurry pump (40), the sand pipe (11) of the hydrocyclone (10) is connected with the grinding device (20), the grinding device (20) is connected with the cyclone feed pump pool (30), and the cyclone feed pump pool (30) is connected with the variable frequency slurry pump (40); the hydrocyclone (10) is provided with a pressure sensor (50).

2. The pressure stabilizing control system of an industrial hydrocyclone according to claim 1, characterized in that, The cyclone feed pump pool (30) is provided with a liquid level sensor (60), a feed pipe (70) and a pump pool water supply pipe (80), and the pump pool water supply pipe (80) is provided with a water supply valve (90).

3. The pressure stabilizing control system of an industrial hydrocyclone according to claim 2, characterized in that, The variable frequency slurry pump (40) is connected with the cyclone feed pump pool (30) through a slurry pipe (100); the slurry pipe inlet (101) is located below the pump pool water supply pipe outlet (81) in the cyclone feed pump pool (30).

4. The pressure stabilizing control system of an industrial hydrocyclone according to claim 3, characterized in that, The pump pool water supply pipe outlet (81) is located 200-300 mm above and 200-300 mm in front of the slurry pipe inlet (101); and the slurry pipe (100) coincides with the center line of the inlet of the variable frequency slurry pump (40).

5. An industrial hydrocyclone pressure stabilisation control method, characterised by, The control system comprises a hydrocyclone (10), a grinding device (20), a cyclone feed pump pool (30) and a variable frequency slurry pump (40), the sand pipe (11) of the hydrocyclone (10) is connected with the grinding device (20), the grinding device (20) is connected with the cyclone feed pump pool (30), and the cyclone feed pump pool (30) is connected with the variable frequency slurry pump (40); the hydrocyclone (10) is provided with a pressure sensor (50). acquire a pressure value of the pressure sensor (50) within a first preset time, and obtain an average value P of the pressure values within the first preset time avg1 ; acquire a pressure value of the pressure sensor (50) in a previous first preset time, and obtain an average value P of the pressure values in the previous first preset time avg2 ; If the average value P avg1 is located in the pressure adjustment dead zone, the frequency of the frequency conversion slurry pump (40) is kept unchanged; if the average value P avg1 is greater than the pressure adjustment deadband, and the average value P avg1 is greater than the average value P avg2 , then decrease the frequency of the variable frequency slurry pump (40); if the average value P avg1 is less than the pressure adjustment deadband, and the average value P avg1 is less than the average value P avg2 then increase the frequency of the variable frequency slurry pump (40).

6. The method of claim 5, wherein the method further comprises: The adjustment range of the variable frequency slurry pump (40) is 0.1-0.5 Hz.

7. The method of claim 5, wherein the method further comprises: The pressure sensor (50) continuously collects pressure every second to obtain a pressure value P N wherein P N ∈ (P1, P2, P3,..., P n ), P n represents the pressure value of the nth second; The first preset time is Qs, and then:

8. An industrial hydrocyclone pressure stabilisation control method, characterised by, The control system comprises a hydrocyclone (10), a grinding device (20), a cyclone feed pump pool (30) and a variable frequency slurry pump (40), the sand pipe (11) of the hydrocyclone (10) is connected with the grinding device (20), the grinding device (20) is connected with the cyclone feed pump pool (30), and the cyclone feed pump pool (30) is connected with the variable frequency slurry pump (40); the hydrocyclone (10) is provided with a pressure sensor (50). acquiring a liquid level value of the liquid level sensor (60) within a second preset time, and obtaining an average value L of the liquid level values within the second preset time avg1 ; acquire the liquid level value of the liquid level sensor (60) in the previous second preset time, and obtain the average value L of the liquid level values in the previous first preset time avg2 ; If the average value L avg1 If the liquid level is within the dead zone, the opening of the water valve (90) is kept unchanged. if the average value L avg1 is greater than the liquid level adjustment dead band, and the average value L avg1 is greater than the average value L avg2 then decrease the opening of the water fill valve (90); If the average value L avg1 is less than the liquid level adjustment dead zone, and the average value L avg1 is less than the average value L avg2 , then increase the opening of the water addition valve (90).

9. The method of claim 8, wherein the method further comprises: L avg1 greater than the level adjustment deadband, and the average value L avg1 greater than average value L avg2 then decrease the opening of the water fill valve (90): If the average value L avg1 If the liquid level is in the first liquid level slow adjustment region, the opening of the water adding valve (90) is reduced by 0.1-0.5% of the full opening degree of the water adding valve (90). If the average value L avg1 If the liquid level is in the first rapid adjustment zone, the water valve (90) is reduced by 0.2-1% of the full opening degree. The second liquid level fast adjustment zone is less than the second liquid level slow adjustment zone, and the liquid level adjustment dead zone. and / or the average value L avg1 less than the liquid level adjustment dead zone, and the average value L avg1 less than the average value L avg2 then increase the opening of the water addition valve (90) If the average value L avg1 If the second liquid level is located in the second slow adjustment region, the opening of the water adding valve (90) is increased by 0.1-0.5% of the full opening degree of the water adding valve (90). If the average value L avg1 If the second liquid level is in the fast adjustment region, the opening of the water adding valve (90) is increased by 0.2-1% of the full opening degree of the water adding valve (90). The total height of the cyclone feed pump pool (30) is H m, and the liquid level adjustment dead zone is H / 2-3H / 4 m.

10. The method of claim 8, wherein the method further comprises: ​

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