A control method and system for the water level of an overflow tank

Abstract

The present application relates to the technical field of coal mill, particularly relates to a kind of overflow water tank water level control method and system, comprising: real-time acquisition primary air pressure value and water level value;According to the primary air pressure value, corresponding target water level value is calculated, and according to the target water level value, the opening degree of the overflow water tank is adjusted Water gate opening degree or drainage gate opening degree, until the water level value reaches the target water level value;If the water level value does not reach the target water level value within a predetermined time, an alarm signal is sent.The present application solves the problem that the water level of the fixed overflow water tank cannot adapt to the change of primary air pressure, and the water level is influenced by many factors, when the water level is too high, the output of the coal mill is reduced, which causes unstable combustion, and when the water level is too low, it may cause stone coal to ignite and cause fire hazard.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mills, in particular to a control method and system for water level of an overflow water tank. BACKGROUND

[0002] When the stone coal hopper is in normal operation, the pressure in the stone coal hopper is the same as the pressure inside the coal mill, and the water in the overflow water tank plays a water seal role, which can seal the hot air in the coal mill, and the feed valve is kept open to receive the stone coal continuously discharged from the coal mill, and the discharge valve is kept closed.

[0003] However, under different load conditions, the primary air pressure of each mill is adjusted according to the change of coal quantity and quality, so the fixed water level of the overflow water tank cannot adapt to the change of the primary air pressure, and the water level is affected by many factors. When the water level is too high, the output of the coal mill decreases, causing unstable combustion. When the water level is too low, the stone coal may catch fire, causing fire hazards. Therefore, how to provide a control method and system for the water level of the overflow water tank is a technical problem to be solved at present. SUMMARY

[0004] In view of the problems existing in the prior art, the purpose of the present application is to provide a control method and system for the water level of an overflow water tank. The target water level value is calculated according to the primary air pressure, and the target water level value is corrected according to the primary air pressure fluctuation range, the primary air temperature and the stone coal hopper temperature to determine the accurate target water level value. The drainage door opening degree and the water replenishment door opening degree of the overflow water tank are adjusted according to the target water level value, and the adjustment is stopped until the water level value reaches the target water level value. The adjustment time is calculated, and if the adjustment time is greater than the preset time, an alarm signal is sent. The problem that the fixed water level of the overflow water tank cannot adapt to the change of the primary air pressure, and the water level is affected by many factors, the water level is too high, the output of the coal mill decreases, causing unstable combustion, and the water level is too low, which may cause the stone coal to catch fire and cause fire hazards, is solved.

[0005] In order to achieve the above-mentioned purpose, the present application provides a control method and system for the water level of an overflow water tank, the control method comprising:

[0006] real-time acquisition of the primary air pressure value P0 and the water level value H0;

[0007] calculating the corresponding target water level value K according to the primary air pressure value P0, adjusting the water replenishment door opening degree or the drainage door opening degree of the overflow water tank according to the target water level value K, and stopping the adjustment until the water level value H0 reaches the target water level value K;

[0008] if the water level value H0 does not reach the target water level value K within the preset time, an alarm signal is sent.

[0009] In some embodiments of the present application, before adjusting the opening degree of the water supply door or the opening degree of the water discharge door of the overflow tank according to the target water level value K, the method comprises:

[0010] obtaining a plurality of primary air pressure values in a preset time period, calculating a wind pressure fluctuation amplitude N0 of the primary air pressure value P0, and performing a first correction on the target water level value K according to the wind pressure fluctuation amplitude N0;

[0011] The first preset wind pressure fluctuation amplitude N1, the second preset wind pressure fluctuation amplitude N2, the third preset wind pressure fluctuation amplitude N3, and the fourth preset wind pressure fluctuation amplitude N4 are preset, and N1

[0012] When N0

[0013] When N1

[0014] When N2

[0015] When N3

[0016] In some embodiments of the present application, the primary air temperature T0 is obtained in real time, and a second correction is performed on the target water level value K according to T0;

[0017] The first preset primary air temperature T1, the second preset primary air temperature T1, the third preset primary air temperature T3, and the fourth preset primary air temperature T4 are preset, and T1

[0018] When T0

[0019] When TI≤T0<T2, the second preset water level second correction coefficient β2 is selected to correct K, and the corrected target water level value is K*α2*β2;

[0020] When T2≤T0<T3, the third preset water level second correction coefficient β3 is selected to correct K, and the corrected target water level value is K*α3*β3;

[0021] When T3≤T0<T4, the fourth preset water level second correction coefficient β4 is selected to correct K, and the corrected target water level value is K*α4*β4.

[0022] In some embodiments of the present application, the temperature value S0 in the stone coal hopper is obtained, and the target water level value K is corrected three times according to S0;

[0023] The first preset temperature value S1, the second preset temperature value S2, the third preset temperature value S3, and the fourth preset temperature value S4 are pre-set, and S1<S2<S3<S4; the first preset water level third correction coefficient γ1, the second preset water level third correction coefficient γ2, the third preset water level third correction coefficient γ3, and the fourth preset water level third correction coefficient γ4 are pre-set, and 1<γ1<γ2<γ3<γ4<1.2;

[0024] When S1≤S0<S2, the first preset water level third correction coefficient γ1 is selected to correct K, and the corrected target water level value is K*α1*β1*γ1;

[0025] When S2≤S0<S3, the second preset water level third correction coefficient γ2 is selected to correct K, and the corrected target water level value is K*α2*β2*γ2;

[0026] When S3≤S0<S4, the third preset water level third correction coefficient γ3 is selected to correct K, and the corrected target water level value is K*α3*β3*γ3;

[0027] When S4≤S0, the fourth preset water level third correction coefficient γ4 is selected to correct K, and the corrected target water level value is K*α4*β4*γ4.

[0028] In some embodiments of the present application, when the water supplement door opening degree or the water discharge door opening degree of the overflow water tank is adjusted according to the target water level value K, it comprises:

[0029] The water level difference between the corrected target water level value K*αi*βi*γi and the water level H0 is calculated, and the water supplement door opening degree or the water discharge door opening degree is adjusted according to the water level difference;

[0030] When K*αi*βi*γi-H0<0, the water discharge door opening degree is adjusted;

[0031] When 0 < K*ai*bi*gi-H0, the water replenishment door opening degree is adjusted.

[0032] In some embodiments of the present application, when 0 < K*ai*bi*gi-H0, the water replenishment door opening degree is adjusted, comprising:

[0033] The first preset water level difference H1, the second preset water level difference H2, the third preset water level difference H3, and the fourth preset water level difference H4 are preset, and 0 < H1 < H2 < H3 < H4; the first preset water replenishment door opening degree L1, the second preset water replenishment door opening degree L2, the third preset water replenishment door opening degree L3, and the fourth preset water replenishment door opening degree L4 are also preset, and L1 < L2 < L3 < L4;

[0034] When 0 < K*ai*bi*gi-K0 < H1, the first preset water replenishment door opening degree L1 is selected as the current water replenishment door opening degree;

[0035] When H1 ≤ K*ai*bi*gi-K0 < H2, the second preset water replenishment door opening degree L2 is selected as the current water replenishment door opening degree;

[0036] When H2 ≤ K*ai*bi*gi-K0 < H3, the third preset water replenishment door opening degree L3 is selected as the current water replenishment door opening degree;

[0037] When H3 ≤ K*ai*bi*gi-K0 < H4, the fourth preset water replenishment door opening degree L4 is selected as the current water replenishment door opening degree.

[0038] In some embodiments of the present application, when K*ai*bi*gi-H0 < 0, the water replenishment door opening degree is adjusted, comprising:

[0039] The fifth preset water level difference H5 and the sixth preset water level difference H6 are preset, and H5 < H6 < 0; the first preset water replenishment door opening degree Y1, the second preset water replenishment door opening degree Y2, and the third preset water replenishment door opening degree Y3 are preset, and Y1 < Y2 < Y3;

[0040] When K*ai*bi*gi-H0 < H5, the third preset water replenishment door opening degree Y3 is selected as the current water replenishment door opening degree;

[0041] When H5 ≤ K*ai*bi*gi-H0 < H6, the second preset water replenishment door opening degree Y2 is selected as the current water replenishment door opening degree;

[0042] When H6 ≤ K*ai*bi*gi-H0 < 0, the first preset water replenishment door opening degree Y1 is selected as the current water replenishment door opening degree.

[0043] In some embodiments of the present application, the time for obtaining the target water level value after three corrections is set as the first time t1, and the time for adjusting the water level value H0 to reach the target water level value K is set as the second time t2;

[0044] Calculate the time difference between the second time and the first time, compare the time difference with the preset time, if the time difference is not greater than the preset time, do not send an alarm signal; if the time difference is greater than the preset time, send an alarm signal.

[0045] In some embodiments of the present application, a control system for the water level of an overflow tank is also included:

[0046] Acquisition module, used to obtain the wind pressure value P0 and water level value H0 in real time;

[0047] an adjustment module, configured to calculate a corresponding target water level value K according to the primary wind pressure value P0, and adjust an opening of a water supply valve or a drain valve of the overflow tank according to the target water level value K until the water level value H0 reaches the target water level value K;

[0048] The alarm module is configured to send an alarm signal if the water level value H0 does not reach the target water level value K within a preset time.

[0049] In some embodiments of the present application, the acquisition module includes:

[0050] A wind pressure sensor is provided inside the pebble coal hopper, and is used to obtain the primary wind pressure inside the pebble coal hopper in real time;

[0051] A water level measuring instrument is provided inside the overflow water tank, and is used to obtain the water level value of the overflow water tank in real time;

[0052] a first temperature sensor, disposed inside the pebble coal hopper, for obtaining a temperature value inside the pebble coal hopper in real time;

[0053] The second temperature sensor is arranged at the entrance of the stone coal hopper, and the second temperature sensor is used to obtain the primary air temperature value in real time.

[0054] The present invention provides a method and system for controlling the water level of an overflow tank, which has the following beneficial effects compared to the prior art:

[0055] The application discloses a kind of overflow water tank water level control method and system, by real-time acquisition stone coal hopper in primary air pressure value and overflow water tank water level value, by primary air pressure value calculation overflow water tank target water level value, and according to primary air pressure fluctuation amplitude, primary air temperature, stone coal hopper in temperature value is revised target water level value, according to revised target water level value adjustment overflow water tank drain gate opening degree and water replenishment door opening degree, until water level value reaches target water level value, and obtain adjustment time, if adjustment time is greater than preset time, send alarm signal, it cannot be adapted to the change of primary air pressure that fixed overflow water tank water level is solved, and water level is influenced by many factors, when water level is too high, make the output of coal mill drop, cause combustion instability, when water level is too low, it can cause stone coal fire, cause fire hazard problem. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 The flow chart of the overflow water tank water level control method in the embodiment of the application is shown;

[0057] Figure 2 The structural schematic diagram of the overflow water tank water level control system in the embodiment of the application is shown;

[0058] Figure 3 The connection schematic diagram of the overflow water tank water level control system in the embodiment of the application is shown;

[0059] 1, stone coal hopper;2, overflow water tank;3, air pressure sensor;4, second temperature sensor;5, first temperature sensor;6, water level measuring instrument;7, water replenishment door;8, drain gate. DETAILED DESCRIPTION

[0060] The specific embodiment of the application is further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the application, but not to limit the scope of the application.

[0061] In the description of the present application, it is understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or a number of the indicated technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0063] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two 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.

[0064] The following is a description of the preferred embodiments of the present application in conjunction with the accompanying drawings.

[0065] As shown in Figure 1 The embodiments of the present application disclose a control method for water level of overflow water tank, comprising:

[0066] Step S101: real-time acquisition of primary air pressure value P0 and water level value H0;

[0067] Step S102: calculating corresponding target water level value K according to the primary air pressure value P0, adjusting the water replenishing door opening degree or the water draining door opening degree of the overflow water tank 2 according to the target water level value K, until the water level value H0 reaches the target water level value K;

[0068] Step S103: if the water level value H0 does not reach the target water level value K within a preset time, sending an alarm signal.

[0069] In the present embodiment, the primary air pressure value in the stone coal hopper 1 and the water level value in the overflow water tank 2 are acquired, the target water level value is calculated according to the primary air pressure value, the internal pressure of the overflow water tank 2 is P = ρ liquid gh, the pressure in the stone coal hopper 1 is F = Ps, so F = ρ liquid ghS, and thus the corresponding target water level value K, i.e. h in the formula, is calculated.

[0070] In some embodiments of the present application, before adjusting the water replenishing door opening degree or the water draining door opening degree of the overflow water tank 2 according to the target water level value K, comprising:

[0071] Acquiring a plurality of primary air pressure values in a preset time period, calculating the air pressure fluctuation amplitude N0 of the primary air pressure value P0, and performing a first correction on the target water level value K according to the air pressure fluctuation amplitude N0;

[0072] The first preset wind pressure fluctuation amplitude N1, the second preset wind pressure fluctuation amplitude N2, the third preset wind pressure fluctuation amplitude N3, and the fourth preset wind pressure fluctuation amplitude N4 are preset, and N1

[0073] When N0

[0074] When N1

[0075] When N2

[0076] When N3

[0077] In the embodiment, when the primary air pressure rises, the water seal of the overflow tank 2 cannot seal the hot air, the hot air leaks from the overflow tank 2, the temperature of the stone coal hopper 1 rises, and the stone coal is ignited. Therefore, the target water level value should be appropriately increased. When the primary air pressure drops, the target water level value can be appropriately reduced. The preset time period is 15 minutes. The primary air pressure fluctuation amplitude of the previous 15 minutes is calculated. The primary air pressure fluctuation amplitude is positive or negative. When the primary air pressure rises, the primary air pressure fluctuation amplitude is positive. When the primary air pressure drops, the primary air pressure fluctuation amplitude is negative. When the primary air pressure fluctuation amplitude is positive and increases, the target water level value should be appropriately increased. When the primary air pressure fluctuation amplitude is negative, the target water level value should be appropriately reduced.

[0078] In some embodiments of the application, the primary air temperature T0 is obtained in real time, and the target water level value K is secondarily corrected according to T0.

[0079] The first preset primary air temperature T1, the second preset primary air temperature T2, the third preset primary air temperature T3, and the fourth preset primary air temperature T4 are preset, and T1

[0080] When T0

[0081] When T1≤T0

[0082] When T2≤T0

[0083] When T3≤T0

[0084] In the embodiment, the target water level value is increased when the primary air temperature value is high, and the target water level value is decreased when the primary air temperature value is low.

[0085] In some embodiments of the present application, the temperature value S0 in the stone coal hopper 1 is obtained, and the target water level value K is modified three times according to S0.

[0086] The first preset temperature value S1, the second preset temperature value S2, the third preset temperature value S3, and the fourth preset temperature value S4 are preset, and S1

[0087] When S1≤S0

[0088] When S2≤S0

[0089] When S3≤S0

[0090] When S4≤S0

[0091] In the embodiment, when the temperature in the stone coal hopper 1 is increasing, the target water level value should be appropriately increased, so that the overflow water tank 2 water seal seals the hot air, thereby avoiding the stone coal from being ignited.

[0092] In some embodiments of the present application, when adjusting the water replenishment door opening degree or the water drainage door opening degree of the overflow water tank 2 according to the target water level value K, the following steps are included:

[0093] calculating the water level difference between the target water level value K*αi*βi*γi and the water level value H0, and adjusting the water replenishment door opening degree or the water drainage door opening degree according to the water level difference;

[0094] when K*αi*βi*γi-H0<0, adjusting the water drainage door opening degree;

[0095] when 0

[0096] In the embodiment, when the water level value is greater than the target water level value, the water in the overflow water tank 2 should be drained, and the water drainage door 8 opening degree is adjusted according to the difference value; when the water level value is less than the target water level value, the overflow water tank 2 should be watered, and the water replenishment door 7 opening degree is adjusted according to the difference value.

[0097] In some embodiments of the present application, when 0

[0098] a first preset water level difference value H1, a second preset water level difference value H2, a third preset water level difference value H3, and a fourth preset water level difference value H4 are preset, and 0

[0099] when 0

[0100] when H1≤K*αi*βi*γi-K0

[0101] when H2≤K*αi*βi*γi-K0

[0102] when H3≤K*αi*βi*γi-K0

[0103] In some embodiments of the present application, when K*αi*βi*γi-H0<0, adjusting the opening of the drain valve includes:

[0104] A fifth preset water level difference H5 and a sixth preset water level difference H6 are preset, and H5<H6<0; a first preset drain valve opening Y1, a second preset drain valve opening Y2, and a third preset drain valve opening Y3 are preset, and Y1<Y2<Y3;

[0105] When K*αi*βi*γi-H0<H5, the third preset drain door opening Y3 is selected as the current drain door opening 8;

[0106] When H5≤K*αi*βi*γi-H0<H6, the second preset drain door opening Y2 is selected as the current drain door opening 8;

[0107] When H6≤K*αi*βi*γi-H0<0, the first preset drain door opening Y1 is selected as the current drain door 8 opening.

[0108] In some embodiments of the present application, the time for obtaining the target water level value after three corrections is set as the first time t1, and the time for adjusting the water level value H0 to reach the target water level value K is set as the second time t2;

[0109] Calculate the time difference between the second time and the first time, compare the time difference with the preset time, if the time difference is not greater than the preset time, do not send an alarm signal; if the time difference is greater than the preset time, send an alarm signal.

[0110] In this embodiment, the preset time is determined in real time based on the water level difference. When the water level difference is small, the preset time will become smaller accordingly. When the water level difference is large, the preset time will become larger accordingly. It is set according to the time required for historical water level adjustment. When the time difference is greater than the preset time, it means that the target water level value has not been adjusted within the corresponding time, and an alarm signal is sent to check the specific reason.

[0111] In some embodiments of the present application, Figure 2 As shown, it also includes a control system for the water level of the overflow tank 2:

[0112] Acquisition module, used to obtain the wind pressure value P0 and water level value H0 in real time;

[0113] an adjustment module, configured to calculate a corresponding target water level value K according to the primary wind pressure value P0, and adjust an opening of a water supply valve or a drain valve of the overflow tank 2 according to the target water level value K, until the water level value H0 reaches the target water level value K;

[0114] An alarm module is configured to send an alarm signal if the water level value H0 does not reach the target water level value K within a preset time.

[0115] In some embodiments of the present application, as shown in Figure 3 The acquisition module comprises:

[0116] A wind pressure sensor 3 is arranged inside the stone coal hopper 1, and is configured to acquire a primary air pressure inside the stone coal hopper 1 in real time.

[0117] A water level measuring instrument 6 is arranged inside the overflow water tank 2, and is configured to acquire a water level value of the overflow water tank 2 in real time.

[0118] A first temperature sensor 5 is arranged inside the stone coal hopper 1, and is configured to acquire a temperature value inside the stone coal hopper 1 in real time.

[0119] A second temperature sensor 4 is arranged at an inlet of the stone coal hopper 1, and is configured to acquire a primary air temperature value in real time.

[0120] In summary, the present application discloses a control method and system for a water level of an overflow water tank, comprising: acquiring a primary air pressure value P0 and a water level value H0 in real time; calculating a corresponding target water level value K according to the primary air pressure value P0, adjusting an opening degree of a water replenishing door 7 or an opening degree of a drainage door 8 of the overflow water tank 2 according to the target water level value K, until the water level value H0 reaches the target water level value K; and sending an alarm signal if the water level value H0 does not reach the target water level value K within a preset time.

[0121] In the description of the above-described embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0122] Although the present application has been described with reference to the above embodiments, various modifications can be made to the application and equivalents thereof without departing from the scope of the application. In particular, features of the disclosed embodiments can be used in any combination without departing from the scope of the application, and the description of the various embodiments does not imply that the features are not combinable unless the context clearly dictates otherwise. Thus, the present application is not limited to the specific embodiments disclosed herein but encompasses all alternatives falling within the scope of the claims.

[0123] It is to be understood that the above description is intended to be illustrative and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reading the above description. The scope of the application should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with their full scope of equivalents.

Claims

1. A method for controlling the water level of an overflow tank, characterized in that: include: Obtain the wind pressure value P0 and water level value H0 in real time; Calculating a corresponding target water level value K according to the primary wind pressure value P0, and adjusting the opening of the water supply valve or the drainage valve of the overflow tank according to the target water level value K until the water level value H0 reaches the target water level value K; If the water level value H0 does not reach the target water level value K within the preset time, an alarm signal is sent; Before adjusting the opening of the water supply valve or the drain valve of the overflow tank according to the target water level value K, the method includes: Acquire multiple primary wind pressure values ​​within a preset time period, calculate the wind pressure fluctuation amplitude N0 of the primary wind pressure value P0, and perform a primary correction on the target water level value K according to the wind pressure fluctuation amplitude N0; A first preset wind pressure fluctuation amplitude N1, a second preset wind pressure fluctuation amplitude N2, a third preset wind pressure fluctuation amplitude N3, and a fourth preset wind pressure fluctuation amplitude N4 are preset, and N1<N2<0<N3<N4; A first correction coefficient α1 for a first preset water level, a first correction coefficient α2 for a second preset water level, a first correction coefficient α3 for a third preset water level, and a first correction coefficient α4 for a fourth preset water level are preset, and 0.8<α1<α2<1<α3<α4<1.2; When N0<N1, the first correction coefficient α1 of the first preset water level is selected to correct K, and the corrected target water level value is K*α1; When N1≤N0<N2, the first correction coefficient α2 of the second preset water level is selected to correct K, and the corrected target water level value is K*α2; When N2≤N0<N3, the first correction coefficient α3 of the third preset water level is selected to correct K, and the corrected target water level value is K*α3; When N3≤N0<N4, the first correction coefficient α4 of the fourth preset water level is selected to correct K, and the corrected target water level value is K*α4.

2. The overflow tank water level control method according to claim 1, characterized in that: Obtain the primary air temperature T0 in real time, and perform secondary correction on the target water level value K according to T0; A first preset primary air temperature T1, a second preset primary air temperature T2, a third preset primary air temperature T3, and a fourth preset primary air temperature T4 are preset, and T1<T2<T3<T4; a first preset water level second correction coefficient β1, a second preset water level second correction coefficient β2, a third preset water level second correction coefficient β3, and a fourth preset water level second correction coefficient β4 are preset, and 0.8<β1<β2<1<β3<β4<1.2; When T0<T1, the second correction coefficient β1 of the first preset water level is selected to correct K, and the corrected target water level value is K*α1*β1; When TI≤T0<T2, the second correction coefficient β2 of the second preset water level is selected to correct K, and the corrected target water level value is K*α2*β2; When T2≤T0<T3, the second correction coefficient β3 of the third preset water level is selected to correct K, and the corrected target water level value is K*α3*β3; When T3≤T0<T4, the fourth preset water level second correction coefficient β4 is selected to correct K, and the corrected target water level value is K*α4*β4.

3. The method for controlling the water level of an overflow tank according to claim 2, characterized in that: Obtain the temperature value S0 in the pebble coal hopper, and perform three corrections on the target water level value K based on S0; A first preset temperature value S1, a second preset temperature value S2, a third preset temperature value S3, and a fourth preset temperature value S4 are preset, and S1<S2<S3<S4; a first preset water level third correction coefficient γ1, a second preset water level third correction coefficient γ2, a third preset water level third correction coefficient γ3, and a fourth preset water level third correction coefficient γ4 are preset, and 1<γ1<γ2<γ3<γ4<1.2; When S1≤S0<S2, the third correction coefficient γ1 of the first preset water level is selected to correct K, and the corrected target water level value is K*α1*β1*γ1; When S2≤S0<S3, the third correction coefficient γ2 of the second preset water level is selected to correct K, and the corrected target water level value is K*α2*β2*γ2; When S3≤S0<S4, the third correction coefficient γ3 of the third preset water level is selected to correct K, and the corrected target water level value is K*α3*β3*γ3; When S4≤S0, the third correction coefficient γ4 of the fourth preset water level is selected to correct K, and the corrected target water level value is K*α4*β4*γ4.

4. The method for controlling the water level of an overflow tank according to claim 3, characterized in that: When adjusting the opening of the water supply valve or the drain valve of the overflow tank according to the target water level value K, it includes: Calculate the water level difference between the corrected target water level value K*αi*βi*γi and the water level value H0, and adjust the water supply gate opening or the drainage gate opening according to the water level difference; When K*αi*βi*γi-H0<0, adjust the opening of the drainage door; When 0<K*αi*βi*γi-H0, adjust the opening of the water supply door.

5. The method for controlling the water level of an overflow tank according to claim 4, characterized in that: When 0<K*αi*βi*γi-H0, adjusting the opening of the water supply gate includes: A first preset water level difference H1, a second preset water level difference H2, a third preset water level difference H3, and a fourth preset water level difference H4 are preset, and 0<H1<H2<H3<H4; a first preset water supply gate opening L1, a second preset water supply gate opening L2, a third preset water supply gate opening L3, and a fourth preset water supply gate opening L4 are also set, and L1<L2<L3<L4; When 0<K*αi*βi*γi-K0<H1, the first preset water supply door opening L1 is selected as the current water supply door opening; When H1≤K*αi*βi*γi-K0<H2, the second preset water supply gate opening L2 is selected as the current water supply gate opening; When H2≤K*αi*βi*γi-K0<H3, the third preset water supply door opening L3 is selected as the current water supply door opening; When H3≤K*αi*βi*γi-K0<H4, the fourth preset water supply door opening L4 is selected as the current water supply door opening.

6. The method for controlling the water level of an overflow tank according to claim 4, characterized in that: When K*αi*βi*γi-H0<0, adjusting the opening of the drain gate includes: A fifth preset water level difference H5 and a sixth preset water level difference H6 are preset, and H5<H6<0; a first preset drain valve opening Y1, a second preset drain valve opening Y2, and a third preset drain valve opening Y3 are preset, and Y1<Y2<Y3; When K*αi*βi*γi-H0<H5, the third preset drain valve opening Y3 is selected as the current drain valve opening; When H5≤K*αi*βi*γi-H0<H6, the second preset drain gate opening Y2 is selected as the current drain gate opening; When H6≤K*αi*βi*γi-H0<0, the first preset drain door opening Y1 is selected as the current drain door opening.

7. The method for controlling the water level of an overflow tank according to claim 3, characterized in that: The time for obtaining the target water level value after three corrections is set as the first time t1, and the time for adjusting the water level value H0 to reach the target water level value K is set as the second time t2; Calculate the time difference between the second time and the first time, compare the time difference with the preset time, if the time difference is not greater than the preset time, do not send an alarm signal; if the time difference is greater than the preset time, send an alarm signal.

8. A control system for the water level of an overflow tank, characterized in that: include: Acquisition module, used to obtain the wind pressure value P0 and water level value H0 in real time; an adjustment module, configured to calculate a corresponding target water level value K according to the primary wind pressure value P0, and adjust an opening of a water supply valve or a drain valve of the overflow tank according to the target water level value K until the water level value H0 reaches the target water level value K; an alarm module, configured to send an alarm signal if the water level value H0 does not reach the target water level value K within a preset time; Before adjusting the opening of the water supply valve or the drain valve of the overflow tank according to the target water level value K, the method includes: Acquire multiple primary wind pressure values ​​within a preset time period, calculate the wind pressure fluctuation amplitude N0 of the primary wind pressure value P0, and perform a primary correction on the target water level value K according to the wind pressure fluctuation amplitude N0; A first preset wind pressure fluctuation amplitude N1, a second preset wind pressure fluctuation amplitude N2, a third preset wind pressure fluctuation amplitude N3, and a fourth preset wind pressure fluctuation amplitude N4 are preset, and N1<N2<0<N3<N4; A first correction coefficient α1 for a first preset water level, a first correction coefficient α2 for a second preset water level, a first correction coefficient α3 for a third preset water level, and a first correction coefficient α4 for a fourth preset water level are preset, and 0.8<α1<α2<1<α3<α4<1.2; When N0<N1, the first correction coefficient α1 of the first preset water level is selected to correct K, and the corrected target water level value is K*α1; When N1≤N0<N2, the first correction coefficient α2 of the second preset water level is selected to correct K, and the corrected target water level value is K*α2; When N2≤N0<N3, the first correction coefficient α3 of the third preset water level is selected to correct K, and the corrected target water level value is K*α3; When N3≤N0<N4, the first correction coefficient α4 of the fourth preset water level is selected to correct K, and the corrected target water level value is K*α4.

9. The overflow tank water level control system according to claim 8, characterized in that: The acquisition module includes: A wind pressure sensor is provided inside the pebble coal hopper, and is used to obtain the primary wind pressure inside the pebble coal hopper in real time; A water level measuring instrument is provided inside the overflow water tank, and is used to obtain the water level value of the overflow water tank in real time; a first temperature sensor, disposed inside the pebble coal hopper, for obtaining a temperature value inside the pebble coal hopper in real time; The second temperature sensor is arranged at the entrance of the stone coal hopper, and the second temperature sensor is used to obtain the primary air temperature value in real time.

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