A slime thickener underflow concentration prediction method, system and device

Abstract

The application discloses a coal slime thickener underflow concentration prediction method, system and equipment, relates to the coal slime water treatment technical field, and the method comprises the following steps: obtaining the thickener historical feeding data and dosing data; calculating the total sedimentation slime flow rate that is settled to the bottom and the accumulated suspended slime amount in the thickener at the current moment; calculating the total slime flow rate that is settled to the bottom according to the total sedimentation slime flow rate that is settled to the bottom and the accumulated suspended slime amount in the thickener at the current moment; calculating the underflow sludge discharge flow rate through the underflow pump opening and stopping state and the underflow historical average sludge concentration; calculating the total mass of the thickener bottom sludge according to the current total sludge amount, the total slime flow rate that is settled to the bottom and the underflow sludge discharge flow rate; predicting the underflow slime concentration according to the total mass of the thickener bottom sludge; the method can predict the thickener underflow concentration, and the underflow thickener can be controlled to discharge without frequently starting and stopping through the trial method.

Description

Technical Field

[0001] The present invention relates to the technical field of coal slime water treatment, and in particular to a method, system and equipment for predicting underflow concentration of a coal slime concentrator. Background Art

[0002] The most commonly used processes for treating coal slime water in coal preparation plants are concentration and filtration. In the concentration section, low-concentration coal slime water is subjected to flocculation and sedimentation by adding chemicals, so that the solid coal slime is enriched and settled to the bottom, and discharged as underflow into the subsequent filtration section. At the same time, clarified water overflows from the top and is used as circulating water for upstream sorting processes.

[0003] To further improve production efficiency and ensure optimal operation of the filtration equipment, it is necessary to provide an appropriate feed concentration. Typically, if the concentration is too high, the filter cake formed by the filtration equipment will be thick, the filtration time will be long, and the moisture content will be high. If the concentration is too low, the filter cake will not form easily, air leakage will occur in the filtration system, and pressure cannot be maintained, which will also cause the filter cake moisture content to exceed the standard. Therefore, it is necessary to control the discharge timing of the concentrator underflow to maintain the underflow concentration within the appropriate range.

[0004] The current mainstream method is the trial method, that is, after starting the discharge, the underflow concentration is tested according to the concentration meter installed on the underflow pipe. If it meets the requirements, the discharge is continued until the concentration is lower than the required concentration. If it does not meet the requirements, the discharge is stopped and tried again after waiting for a period of time.

[0005] However, this method requires the discharged underflow to be returned to the concentration system, and the underflow pump must be repeatedly started and stopped, which has an adverse effect on the service life of the equipment and the stability of the system. Summary of the Invention

[0006] In view of the shortcomings of the existing technology that the prediction of the underflow coal slime concentration of the concentrator requires repeated starting and stopping of the underflow pump, which has an adverse effect on the equipment service life and system stability, the present invention proposes a coal slime concentrator underflow concentration prediction method, system and equipment. By predicting the current underflow concentration based on the feed concentration, flow rate, dosing conditions and underflow discharge conditions of the concentrating system, the problems existing in the existing technology are solved.

[0007] A method for predicting underflow concentration of a coal slime thickener comprises the following steps:

[0008] Obtaining historical feed data and dosing data for the concentrator; the dosing data includes the actual value and set value of the dosing amount, and the feed data includes the flow rate of the concentrator feed and the percentage of particles of different size grades in the feed to the total solids;

[0009] Based on the historical feed data and dosing data of the concentrator, the total mass of the bottom sediment of the concentrator at the current moment is obtained; based on the total mass of the bottom sediment of the concentrator at the current moment, the underflow concentration is predicted;

[0010] The method of obtaining the total mass of the bottom sediment of the concentrator at the current moment based on the historical feed data and dosing data of the concentrator specifically includes the following steps:

[0011] Based on the historical feed data and drug dosing data of the concentrator, the amount of coal slime that has settled to the bottom in the form of monomers and the amount of coal slime that has settled to the bottom in the form of flocs are respectively obtained, and the total settled coal slime flow rate of the concentrator at the current moment is determined; the amount of coal slime that has settled to the bottom in the form of monomers is determined by the flow rate of the concentrator feed and the percentage of particles of different size fractions in the feed to the total solids; the amount of coal slime that has settled to the bottom in the form of flocs is determined by the ratio of the actual value of the drug dosing to the set value;

[0012] The accumulated amount of suspended coal slime in the concentrator at the current moment is obtained based on the accumulated amount of individual coal slime that cannot be settled when no chemical is added and the flow rate of individual coal slime that cannot be settled after chemical addition and enters the settled coal slime after flocculation.

[0013] The total mass of the sludge at the bottom of the concentrator is obtained based on the total settled coal slime flow rate, the accumulated suspended coal slime volume, and the mud discharge flow rate of the underflow pump at the current moment.

[0014] Furthermore, the amount of coal slime that settles to the bottom in the form of monomers is expressed as:

[0015]

[0016] in, Indicates the current time backward t x The flow rate of the concentrator feed in seconds, in m 3 / h;t x W represents the settling time required for the coal slime particles or flocs with particle size x to settle to the bottom of the thickener; sed,x It indicates the flow rate of coal slime with particle size x at the current moment when the individual particles or flocs of coal slime settle to the bottom, in kg / h; Indicates the current time backward t x The percentage of particles of size class x in the total solids in the concentrator feed at 1 second; Indicates the current time backward t x The actual value of the dosage in seconds, in L / min; Indicates the current time backward t x The dosage setting value is in L / min.

[0017] The amount of coal slime that settles to the bottom in the form of flocs is expressed as:

[0018]

[0019] Among them, W sed,0 Indicates the flow rate of coal sludge at the bottom of flocs at the current moment, in kg / h; It represents the feed flow of the concentrator at t0 seconds back from the current moment; t0 represents the time required for the coal slime flocs to settle to the bottom; Indicates the actual value of the dosage at t0 seconds after the current moment, in L / min; Indicates the dosage setting value at t0 seconds after the current moment, in L / min.

[0020] Furthermore, the total settled coal slime flow rate settled to the bottom of the concentrator at the current moment is calculated as follows:

[0021]

[0022] Among them, W sed It indicates the total coal slime flow rate that can settle coal slime particles and flocs that settle to the bottom at the current moment, in kg / h.

[0023] Furthermore, the flow rate M of the monomeric coal slime that cannot settle after the start of the dosing is flocculated and then enters the settled coal slime RSS Expressed as:

[0024]

[0025] Among them, t a Indicates the current dosing operation time of the concentrator, in seconds; It indicates the amount of suspended coal slime that settles from the thickener per second after adding chemicals; M TSS,N It indicates the amount of suspended fine mud accumulated in the concentrator when dosing begins, in kg.

[0026] Furthermore, the cumulative amount of individual coal slimes that cannot be settled when no chemical is added in the concentrator at the current moment also includes the cumulative amount of suspended coal slimes with a particle size of 2 to 3 after the chemical addition is stopped in the concentrator, wherein the cumulative amount of individual coal slimes that cannot be settled when no chemical is added M TSS Expressed as:

[0027]

[0028] Among them, M RSS,Y Indicates the amount of suspended fine mud remaining in the concentrator when dosing is stopped, in kg; W in,0 Indicates the flow rate of the concentrator feed at the current moment; C in,0 Indicates the solid concentration of the concentrator feed at the current moment, in g / L; p x,0 It indicates the percentage of particles with size x in the concentrator feed at the current moment in the total solid matter; Δt indicates the time step, in seconds.

[0029] Furthermore, the total mass of the mud at the bottom of the thickener M is obtained based on the total settled coal mud flow rate, the accumulated suspended coal mud volume and the mud discharge flow rate of the underflow pump at the current moment. bot , which is expressed as:

[0030]

[0031] Among them, M bot,-1 Indicates the total mass of sediment at the bottom of the thickener in the last second, C bot Indicates the historical average sludge concentration of the thickener bottom flow, in g / L; K indicates the on / off status of the bottom flow pump, with on being 1 and off being 0; W bot Indicates the sludge discharge flow of the thickener underflow pump, in m 3 / h,W seds It indicates the total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment, in kg / s.

[0032] Furthermore, the total flow rate of coal slime settled to the bottom of the concentrator at the current moment and the accumulated amount of suspended coal slime are used to obtain the total flow rate of coal slime settled to the bottom of the concentrator at the current moment W: seds , expressed as:

[0033] W seds =(W sed +M TSS ) / 3600,

[0034] Among them, W sed It indicates the total coal slime flow rate of settleable coal slime particles and flocs settling to the bottom at the current moment, in kg / h.

[0035] Furthermore, the bottom flow concentration is predicted based on the total mass of the bottom sludge of the concentrator at the current moment, and the bottom flow predicted concentration C' bot Expressed as:

[0036]

[0037] Among them, M bot,av Indicates the historical average value of the total amount of sediment at the bottom of the thickener; C bot,av It indicates the historical average concentration of the thickener bottom flow sludge, in g / L.

[0038] The present invention also includes a coal slime concentrator underflow concentration prediction system, comprising:

[0039] A data acquisition module is used to obtain historical feed data and dosing data of the concentrator; the dosing data includes the actual value and set value of the dosing amount, and the feed data includes the flow rate of the concentrator feed and the percentage of particles of different size grades in the feed to the total solids;

[0040] The prediction module is used to obtain the total mass of the bottom sludge of the concentrator at the current moment based on the historical feed data and dosing data of the concentrator; and to predict the underflow concentration based on the total mass of the bottom sludge of the concentrator at the current moment;

[0041] The method of obtaining the total mass of the bottom sludge of the concentrator at the current moment based on the historical feed data and dosing data of the concentrator includes:

[0042] The total settled coal slime flow calculation unit is used to obtain the amount of coal slime settled to the bottom in the form of monomers and the amount of coal slime settled to the bottom in the form of flocs based on the historical feed data and drug dosing data of the concentrator, and determine the total settled coal slime flow rate settled to the bottom of the concentrator at the current moment. The amount of coal slime settled to the bottom in the form of monomers is determined by the flow rate of the concentrator feed and the percentage of particles of different size fractions in the feed to the total solids; the amount of coal slime settled to the bottom in the form of flocs is determined by the ratio of the actual value of the drug dosing to the set value.

[0043] The cumulative suspended coal slime amount calculation unit is used to obtain the current cumulative amount of suspended coal slime in the concentrator based on the current cumulative amount of individual coal slimes that cannot be settled in the concentrator without adding chemicals and the flow rate of individual coal slimes that cannot be settled after the start of adding chemicals and then enter the settled coal slime after flocculation;

[0044] The total mass calculation unit of the sludge is used to obtain the total mass of the sludge at the bottom of the thickener according to the total settled coal sludge flow rate settled to the bottom of the thickener at the current moment, the accumulated suspended coal sludge amount and the mud discharge flow rate of the underflow pump.

[0045] The present invention also includes a computer device for predicting the underflow concentration of a coal slime concentrator, comprising: a memory, a processor, and a computer program stored in the memory, wherein the processor implements the steps of the method for predicting the underflow concentration of a coal slime concentrator when executing the computer program.

[0046] The present invention provides a method, system and device for predicting underflow concentration of a coal slime concentrator, which has the following features:

[0047] Beneficial effects:

[0048] The present invention obtains the amount of coal slime settled to the bottom in the form of monomers and the amount of coal slime settled to the bottom in the form of flocs according to the feed concentration and the dosing conditions of the concentrator system. At the same time, the accumulated amount of suspended coal slime in the concentrator is calculated according to the accumulated amount of monomer coal slime that cannot settle when no drug is added and the flow rate of the monomer coal slime that cannot settle after the start of drug addition and enters the settled coal slime after flocculation. The current underflow concentration is predicted based on the obtained underflow discharge conditions, which is used to control the underflow discharge time. The method can be used to predict the underflow concentration of the concentrator, and can be used to control the underflow discharge without frequently starting and stopping the underflow concentrator through trial and error. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of the process flow for predicting underflow concentration of a coal slime concentrator in an embodiment of the present invention;

[0050] Figure 2 This is a calculation framework diagram of the underflow concentration prediction process of the coal slime concentrator in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] The present invention proposes a method for predicting the underflow concentration of a coal slime concentrator. This method can predict the current underflow concentration based on the feed concentration, flow rate, chemical dosing, and underflow discharge conditions of the concentrating system, and is used to control the underflow discharge time. When this method is implemented, the concentrator underflow concentration prediction module and the concentrator bottom sludge inventory calculation module operate independently, with variable values ​​transmitted and shared in real time. The following simplified assumptions are made:

[0053] (1) Coal sludge with a particle size of 1 (<45 microns) will flow out of the system with overflow water without adding chemicals and will not be counted when no chemicals are added;

[0054] (2) The sedimentation time of coal slime with particle size of 2-3 (45-125 microns) should be more than 40 minutes, and the non-settling coal slime monomer should be included when no chemical is added;

[0055] (3) Coal slime with a particle size of 3-6 (>125 microns) can be regarded as settleable coal slime.

[0056] like Figure 1 、 Figure 2 As shown, Figure 2 ①, ②, and ③ are the same connecting line; the method specifically includes the following steps:

[0057] S1. Calculate the current amount of sediment at the bottom of the thickener, once every Δt, where the value of Δt ranges from 10 to 30 seconds. The purpose is to reduce the frequency of access to the database while ensuring that the data error is not large.

[0058] S1.1. Read historical feed and dosing data to calculate the instantaneous feed flow rate of the settleable coal slime monomers or flocs currently settled to the bottom when they enter the coal slime thickener.

[0059] The settleable coal slime includes settleable coal slime monomer and floccules. Whether floccules are formed when feeding and the proportion of coal slime that forms floccules are determined by the ratio of the actual dosage to the set dosage. Sure.

[0060] The amount of slime currently settled to the bottom for the monomer particles of size class x is the amount of slime particles of size class x in the slime that has not been flocculated into flocculates, and its flow value is the total amount of size class x slime in the feed at time t0 x The total amount of size class x slime in the feed at time t0 minus the part that has been flocculated into flocculates is expressed as:

[0061]

[0062] Wherein, The amount of slime currently settled to the bottom for the monomer particles of size class x is the amount of slime particles of size class x in the slime that has not been flocculated into flocculates, and its flow value is the total amount of size class x slime in the feed at time t0 x The flow of the feed to the thickener at time t0, in units of m 3 / h; t0 x The settling time required for the size class x slime particles or flocculates to settle to the bottom of the thickener; W sed,x The flow of the size class x slime monomer particles or flocculates settled to the bottom at the current time, in units of kg / h; The amount of size class x particles in the feed to the thickener at time t0 x The percentage of size class x particles in the total solids in the feed to the thickener at time t0 The actual value of the amount of reagent at time t0 x The actual value of the amount of reagent at time t0 The set value of the amount of reagent at time t0 x The set value of the amount of reagent at time t0

[0063] The amount of slime settled to the bottom in the form of flocculates is expressed as:

[0064]

[0065] Wherein, W sed,0 The flow of the size class x slime monomer particles or flocculates settled to the bottom at the current time, in units of kg / h; The flow of the feed to the thickener at time t0, in units of m The actual value of the amount of reagent at time t0 The set value of the amount of reagent at time t0

[0066] The total settled slime flow at the current time is the sum of the two:

[0067]

[0068] Wherein, W sedIt indicates the total coal slime flow rate of settleable coal slime particles and flocs settling to the bottom at the current moment, in kg / h.

[0069] S1.2. Calculate the impact of the suspended coal slime accumulated in the thickening system (mainly single coal slime that cannot settle without adding chemicals, which is suspended and accumulated in the thickening system without adding chemicals during feeding, but will settle to the bottom after the thickening system is started and added) on the bottom flow rate.

[0070] When the system stops adding chemicals (changes from adding chemicals to not adding chemicals), the system enters the state of suspended coal slime accumulation and starts running without adding chemicals. The accumulated amount of suspended coal slime is the accumulated amount of particle size 2-3 (45-125 microns) after starting without adding chemicals, which is expressed as:

[0071]

[0072] Among them, M TSS Indicates the amount of suspended fine mud accumulated in the concentrator, kg; M RSS,Y Indicates the amount of suspended fine mud remaining in the concentrator when dosing is stopped, kg; W in,0 Indicates the flow rate of the concentrator feed at the current moment; C in,0 Indicates the solid concentration of the concentrator feed at the current moment, g / L; p x,0 It represents the percentage of particles with size x in the total solids in the concentrator feed at the current moment; Δt represents the time step, s.

[0073] When the system starts adding drugs (from no adding drugs to adding drugs), the system enters the state of emptying the accumulated mud and starts the dosing operation timer. According to experience, the accumulated mud in the system can be emptied after adding drugs for 1 hour. Therefore, the flow rate from the suspended coal mud to the settled coal mud after adding drugs is M TSS / 3600. The amount of suspended coal slime remaining in the system at a certain point in time within 1 hour is expressed as:

[0074]

[0075] Among them, t a Indicates the current dosing operation time of the concentrator, in seconds; It indicates the amount of suspended coal slime that settles from the thickener per second after adding chemicals; M TSS,N It indicates the amount of suspended fine mud accumulated in the concentrator when dosing begins, in kg.

[0076] Total coal slime flow rate that has settled to the bottom at the current moment:

[0077] W seds =(W sed +N TSS ) / 3600.

[0078] Among them, W sedsIndicates the total flow rate of coal slime that has settled to the bottom at the current moment, in kg / s; W sed It indicates the total coal slime flow rate of settleable coal slime particles and flocs settling to the bottom at the current moment, in kg / h.

[0079] S2. Prediction of underflow slime concentration.

[0080] S2.1. Calculate the total mass of mud at the bottom of the thickener, which is the current total mud storage + the total flow of coal mud that has settled to the bottom - the bottom flow mud discharge flow Expressed as:

[0081]

[0082] Among them, M bot,-1 Indicates the total mass of the bottom sediment in the system in the last second, C bot Indicates the historical average sludge concentration of the thickener bottom flow, g / L; K indicates the on / off status of the bottom flow pump, 1 for on and 0 for off; W bot Indicates the sludge discharge flow of the thickener underflow pump, m 3 / h.

[0083] S2.2. Calculate the predicted underflow concentration:

[0084]

[0085] Among them, M bot,av Indicates the historical average value of the total amount of sediment at the bottom of the thickener; C bot,av It indicates the historical average concentration of the thickener bottom flow sludge, in g / L.

[0086] In the present invention, the variable p x Refers to the proportion of particles of each size class in the thickener feed, which is detected by the online particle size analyzer and stored in the historical database and read when needed. In the case of little fluctuation in coal quality or no online particle size detector is installed, offline test data can be used instead, which does not change with time. C in,t 、 Variables are detected by online instruments and stored in a historical database, and can be read when needed.

[0087] According to calculations, particles of all sizes with a diameter greater than 74 microns in the concentrator feed are in the transition zone when they are freely settling. The transition zone settling formula can be used to calculate their free settling speed:

[0088]

[0089] The natural settling speed of each particle size fraction in the thickening tank:

[0090]

[0091] Among them, t x After the first calculation, it is used as a constant; u x Indicates the sedimentation velocity of coal slime particles or flocs of particle size x (=0-6) in the thickener, m / s; u t,x represents the terminal free settling velocity of coal slime particles or flocs of particle size x (=0-6), m / s; D represents the concentrator diameter, m; H represents the average height of the concentrator tank, m; ρ s Indicates the average density of coal slime particles, kg / m 3 ;d x It represents the average diameter of the coal slime particles or flocs of particle size grade x (=0~6), taking the arithmetic mean of the upper and lower limits of the particle size range. When x=0, the floc particle size d0=0.001, m.

[0092] Based on the same inventive concept, the present invention also includes a coal slime thickener underflow concentration prediction system, comprising:

[0093] The data acquisition module is used to obtain the historical feeding data and dosing data of the concentrator; the dosing data includes the actual value and set value of the dosing amount; the feeding data includes the flow rate of the concentrator feed and the percentage of particles of different particle sizes in the feed to the total solid matter.

[0094] The prediction module is used to obtain the total mass of the bottom sludge of the concentrator at the current moment based on the historical feeding data and dosing data of the concentrator; and predict the underflow concentration based on the total mass of the bottom sludge of the concentrator at the current moment.

[0095] Among them, according to the historical feeding data and dosing data of the concentrator, the total mass of the bottom sediment of the concentrator at the current moment is obtained, including:

[0096] The total settled coal slime flow calculation unit is used to obtain the amount of coal slime settled to the bottom in the form of monomers and the amount of coal slime settled to the bottom in the form of flocs based on the historical feed data and dosing data of the concentrator, and determine the total settled coal slime flow settled to the bottom of the concentrator at the current moment; the amount of coal slime settled to the bottom in the form of monomers is determined by the flow rate of the concentrator feed and the percentage of particles of different particle sizes in the feed to the total solids; the amount of coal slime settled to the bottom in the form of flocs is determined by the ratio of the actual value of the dosing amount to the set value.

[0097] The cumulative suspended coal slime amount calculation unit is used to obtain the current cumulative amount of suspended coal slime in the concentrator based on the cumulative amount of individual coal slimes that cannot be settled when no chemicals are added to the concentrator at the current moment and the flow rate of individual coal slimes that cannot be settled after the start of chemical addition and enter the settled coal slime after flocculation.

[0098] The total mass calculation unit of the sludge is used to obtain the total mass of the sludge at the bottom of the thickener according to the total settled coal sludge flow rate settled to the bottom of the thickener at the current moment, the accumulated suspended coal sludge amount and the mud discharge flow rate of the underflow pump.

[0099] The present invention also includes a computer device for predicting underflow concentration of a coal slime concentrator, comprising: a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, the steps of the method for predicting underflow concentration of a coal slime concentrator are implemented.

[0100] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for predicting underflow concentration of a coal slime thickener, characterized in that: The following steps are involved: Obtain historical feed data and dosing data for the concentrator; the dosing data includes the actual value and set value of the dosing amount, and the feed data includes the flow rate of the concentrator feed and the percentage of particles of different particle sizes in the feed to the total solids; coal sludge with a set particle size of 1 will flow out of the system with overflow water without dosing and will not be counted if no dosing is done; coal sludge with a particle size of 2-3 must have a settling time of more than 40 minutes and will be counted as non-settling coal sludge monomer if no dosing is done; coal sludge with a particle size of 3-6 is considered settleable coal sludge; Based on the historical feed data and dosing data of the concentrator, the total mass of the bottom sediment of the concentrator at the current moment is obtained; based on the total mass of the bottom sediment of the concentrator at the current moment, the underflow concentration is predicted; The method of obtaining the total mass of the bottom sediment of the concentrator at the current moment based on the historical feed data and dosing data of the concentrator specifically includes the following steps: Based on the historical feed data and dosing data of the concentrator, the amount of coal slime settled to the bottom in the form of monomers and the amount of coal slime settled to the bottom in the form of flocs are obtained respectively, and the total settled coal slime flow rate settled to the bottom of the concentrator at the current moment is determined; the total settled coal slime flow rate settled to the bottom of the concentrator at the current moment is calculated as follows: ,in, It represents the total coal slime flow rate of coal slime particles and flocs that can settle to the bottom at the current moment, in kg / h. The amount of coal slime that settles to the bottom in the form of monomers is determined by the feed flow rate of the concentrator and the percentage of particles of different size fractions in the feed to the total solids, and is expressed as: ,in, Indicates the current moment is reversed t x The flow rate of the concentrator feed in seconds, in m 3 / h; t x It indicates the settling time required for the coal slime particles or flocs with particle size x to settle to the bottom in the thickener; Indicates that the current granularity level is x The flow rate of coal slime at which individual particles or flocs of coal slime settle to the bottom, in kg / h; Indicates the current moment is reversed t x Seconds concentrator feed medium particle size x The percentage of particles in the total solids; Indicates the current moment is reversed t x The actual value of the dosage in seconds, in L / min; Indicates the current moment is reversed t x The dosage setting value at 10 seconds is in L / min. The amount of coal slime settled to the bottom in the form of flocs is determined by the ratio of the actual dosage value to the set value, expressed as: ,in, Indicates the flow rate of coal sludge at the bottom of flocs at the current moment, in kg / h; Indicates the current moment is reversed t The flow rate of the concentrator feed at 0 seconds; t 0 represents the time required for the coal slime flocs to settle to the bottom; Indicates the current moment is reversed t The actual value of the dosage at 0 seconds, in L / min; Indicates the current moment is reversed t The dosage setting value at 0 seconds, in L / min; The current accumulated amount of suspended coal slime in the concentrator is obtained based on the current accumulated amount of monomer coal slime that cannot be settled when no drug is added and the flow rate of monomer coal slime that cannot be settled after drug addition and enters the settled coal slime after flocculation. The flow rate of monomer coal slime that cannot be settled after drug addition and enters the settled coal slime after flocculation is obtained. Expressed as: ,in, Indicates the current dosing operation time of the concentrator, in seconds; It indicates the amount of suspended coal slime that settles from the thickener per second after adding chemicals; Indicates the cumulative amount of suspended fine mud in the concentrator when drug addition is started, in kg; the cumulative amount of individual coal slimes that cannot settle when no drug is added in the concentrator at the current moment also includes the cumulative amount of suspended coal slimes with a particle size of 2 to 3 after drug addition is stopped in the concentrator, among which the cumulative amount of individual coal slimes that cannot settle when no drug is added is Expressed as: ,in, Indicates the amount of suspended fine mud remaining in the concentrator when dosing is stopped, in kg; Indicates the flow rate of the concentrator feed at the current moment; Indicates the solid concentration of the concentrator feed at the current moment, in g / L; Indicates that the particle size of the concentrator feed at the current moment is x The percentage of particles in the total solids; Indicates the time step, the unit is s; According to the total settled coal slime flow rate, the accumulated suspended coal slime amount and the mud discharge flow rate of the underflow pump at the current moment of the concentrator, the total mass of the mud at the bottom of the concentrator is obtained; according to the total settled coal slime flow rate, the accumulated suspended coal slime amount and the mud discharge flow rate of the underflow pump at the current moment of the concentrator, the total mass of the mud at the bottom of the concentrator is obtained , which is expressed as: ,in Indicates the total mass of sediment at the bottom of the thickener in the last second. Indicates the historical average sludge concentration of the thickener bottom flow, in g / L; Indicates the start and stop status of the underflow pump; Indicates the sludge discharge flow of the thickener underflow pump, in m 3 / h, It indicates the total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment, in kg / s. The total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment and the accumulated amount of suspended coal slime are used to obtain the total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment. , expressed as: ,in, It indicates the total coal slime flow rate of settleable coal slime particles and flocs settling to the bottom at the current moment, in kg / h; The bottom flow concentration is predicted based on the total mass of the bottom sludge of the concentrator at the current moment. The predicted concentration of the bottom flow Expressed as: ； in, Indicates the historical average value of the total amount of sediment at the bottom of the thickener; It indicates the historical average concentration of the thickener bottom flow sludge, in g / L.

2. A coal slime concentrator underflow concentration prediction system, characterized in that: include: The data acquisition module is used to obtain historical feed data and dosing data of the concentrator; the dosing data includes the actual value and set value of the dosing amount, and the feed data includes the flow rate of the concentrator feed and the percentage of particles of different particle sizes in the feed to the total solids; coal sludge with a set particle size of 1 will flow out of the system with overflow water without dosing and will not be counted when no dosing is done; coal sludge with a particle size of 2-3 must have a settling time of more than 40 minutes and will be counted as non-settling coal sludge monomer when no dosing is done; coal sludge with a particle size of 3-6 is considered as settleable coal sludge; The prediction module is used to obtain the total mass of the bottom sludge of the concentrator at the current moment based on the historical feed data and dosing data of the concentrator; and to predict the underflow concentration based on the total mass of the bottom sludge of the concentrator at the current moment; The method of obtaining the total mass of the bottom sludge of the concentrator at the current moment based on the historical feed data and dosing data of the concentrator includes: The total settled coal slime flow calculation unit is used to obtain the amount of coal slime settled to the bottom in the form of monomers and the amount of coal slime settled to the bottom in the form of flocs based on the historical feeding data and dosing data of the concentrator, and determine the total settled coal slime flow settled to the bottom of the concentrator at the current moment; the calculation formula for the total settled coal slime flow settled to the bottom of the concentrator at the current moment is: ,in, It represents the total coal slime flow rate of coal slime particles and flocs that can settle to the bottom at the current moment, in kg / h. The amount of coal slime that settles to the bottom in the form of monomers is determined by the feed flow rate of the concentrator and the percentage of particles of different size fractions in the feed to the total solids, and is expressed as: ,in, Indicates the current moment is reversed t x The flow rate of the concentrator feed in seconds, in m 3 / h; t x It indicates the settling time required for the coal slime particles or flocs with particle size x to settle to the bottom in the thickener; Indicates that the current granularity level is x The flow rate of coal slime at which individual particles or flocs of coal slime settle to the bottom, in kg / h; Indicates the current moment is reversed t x Seconds concentrator feed medium particle size x The percentage of particles in the total solids; Indicates the current moment is reversed t x The actual value of the dosage in seconds, in L / min; Indicates the current moment is reversed t x The dosage setting value at 10 seconds is in L / min. The amount of coal slime settled to the bottom in the form of flocs is determined by the ratio of the actual dosage value to the set value, expressed as: ,in, Indicates the flow rate of coal sludge at the bottom of flocs at the current moment, in kg / h; Indicates the current moment is reversed t The flow rate of the concentrator feed at 0 seconds; t 0 represents the time required for the coal slime flocs to settle to the bottom; Indicates the current moment is reversed t The actual value of the dosage at 0 seconds, in L / min; Indicates the current moment is reversed t The dosage setting value at 0 seconds, in L / min; The cumulative suspended coal slime amount calculation unit is used to obtain the current cumulative amount of suspended coal slime in the concentrator based on the current cumulative amount of monomer coal slime that cannot be settled when no drug is added to the concentrator and the flow rate of monomer coal slime that cannot be settled after drug addition and enters the settled coal slime after flocculation. The flow rate of monomer coal slime that cannot be settled after drug addition and enters the settled coal slime after flocculation is Expressed as: ,in, Indicates the current dosing operation time of the concentrator, in seconds; It indicates the amount of suspended coal slime that settles from the thickener per second after adding chemicals; Indicates the cumulative amount of suspended fine mud in the concentrator when drug addition is started, in kg; the cumulative amount of individual coal slimes that cannot settle when no drug is added in the concentrator at the current moment also includes the cumulative amount of suspended coal slimes with a particle size of 2 to 3 after drug addition is stopped in the concentrator, among which the cumulative amount of individual coal slimes that cannot settle when no drug is added is Expressed as: ,in, Indicates the amount of suspended fine mud remaining in the concentrator when dosing is stopped, in kg; Indicates the flow rate of the concentrator feed at the current moment; Indicates the solid concentration of the concentrator feed at the current moment, in g / L; Indicates that the particle size of the concentrator feed at the current moment is x The percentage of particles in the total solids; Indicates the time step, the unit is s; The total mass calculation unit of the sludge is used to obtain the total mass of the sludge at the bottom of the concentrator according to the total settled coal slime flow rate, the accumulated suspended coal slime amount and the mud discharge flow rate of the underflow pump at the current moment of the concentrator; the total mass of the sludge at the bottom of the concentrator is obtained according to the total settled coal slime flow rate, the accumulated suspended coal slime amount and the mud discharge flow rate of the underflow pump at the current moment of the concentrator. , which is expressed as: ,in Indicates the total mass of sediment at the bottom of the thickener in the last second. Indicates the historical average sludge concentration of the thickener bottom flow, in g / L; Indicates the start and stop status of the underflow pump; Indicates the sludge discharge flow of the thickener underflow pump, in m 3 / h, It indicates the total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment, in kg / s. The total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment and the accumulated amount of suspended coal slime are used to obtain the total flow rate of coal slime that has settled to the bottom of the concentrator at the current moment. , expressed as: ,in, Indicates the total coal slime flow of settleable coal slime particles and flocs settling to the bottom at the current moment, in kg / h; the bottom flow concentration is predicted based on the total mass of the bottom mud at the concentrator at the current moment, and the predicted concentration of the bottom flow Expressed as: ;in, Indicates the historical average value of the total amount of sediment at the bottom of the thickener; It indicates the historical average concentration of the thickener bottom flow sludge, in g / L.

3. A computer device for predicting underflow concentration of a coal slime thickener, characterized in that: include: A memory, a processor, and a computer program stored in the memory, wherein when the processor executes the computer program, the steps of the method for predicting the underflow concentration of a coal slime thickener according to claim 1 are implemented.

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