Method for intelligent recycling of rolled steel mill scale

Abstract

This invention discloses a method for intelligently recovering iron oxide scale from rolled steel. A metal chain conveyor belt, in conjunction with a stepped chain conveyor belt, is installed between the recovery hopper and the billet roller conveyor. The speed of the stepped chain conveyor belt is adjusted according to the real-time amount of iron oxide scale falling from the roller conveyor, thus completing the recovery of iron oxide scale outside the furnace. This intelligent method for recovering iron oxide scale from rolled steel, through the above setup, can achieve real-time collection of the amount of scale falling and can adapt to different operating conditions and different amounts of scale falling.

Description

Technical Field

[0001] This invention belongs to the field of industrial by-product recycling technology in steel rolling production, specifically relating to a method for intelligent recycling of iron oxide scale in steel rolling. Background Technology

[0002] During the hot rolling process of steel billets, an iron oxide scale inevitably forms on the billet surface. The presence of this scale significantly reduces the heating efficiency of the billet and obscures surface defects. Therefore, brushes, nozzles, and other facilities are typically installed on the rolling mill table to remove the iron oxide scale, facilitating further processing of the billet in subsequent stages. The removed iron oxide scale falls into the grooves beside the rolling mill table, accumulating over time and polluting the environment and clogging pipelines. Manual cleaning is usually only performed during major overhauls, resulting in high labor intensity, a harsh and dangerous working environment, and inconsistent quantity and quality of recovered iron oxide scale, leading to a relatively inefficient overall management approach.

[0003] The invention application with application number CN2015106855648 discloses "a wire control cooling device with online recycling function and its usage method." A cooling fan is located below the conveyor rollers, and an openable / closable insulation cover is located above the conveyor rollers. The openable / closable insulation cover is connected to a flexible air duct, which is connected to a fixed air duct. The fixed air duct is equipped with a waste heat recovery device and an iron oxide scale recovery device, and an induced draft fan is installed at its end. When the wire coil requires forced air cooling, hot air carrying iron oxide scale is introduced into the flexible and fixed air ducts under the combined action of the cooling fan and the induced draft fan, reaching the waste heat recovery device to recover the iron oxide scale.

[0004] The invention application with application number CN2021102797615 discloses "a device and method for recycling iron oxide scale from a rolling mill", which includes a horizontally arranged cleaning tank, a high-pressure water descaling box vertically arranged at the discharge end of the cleaning tank, a first guide roller and a second guide roller respectively arranged at the inlet and outlet ends of the cleaning tank, a third guide roller and a fourth guide roller respectively arranged at the inlet and outlet ends of the high-pressure water descaling box, a plurality of ultrasonic devices arranged sequentially along the length of the cleaning tank, and a plurality of nozzles arranged sequentially along the length of the high-pressure water descaling box. Summary of the Invention

[0005] The purpose of this invention is to provide an automated and quantitative method for recovering iron oxide scale.

[0006] To achieve the above technical objectives, this invention provides a method for intelligently recycling rolled steel oxide scale, the specific technical solution of which is as follows:

[0007] A method for intelligently recycling iron oxide scale from rolled steel.

[0008] Between the recycling hopper and the billet roller conveyor, a metal chain conveyor belt is set up in conjunction with a stepped chain conveyor belt. The speed of the stepped chain conveyor belt is adjusted according to the real-time amount of iron oxide scale falling from the roller conveyor, so as to complete the recycling of iron oxide scale outside the furnace.

[0009] Furthermore,

[0010] A sloping groove is set up beside the billet roller conveyor, and a metal chain conveyor belt is installed in the groove.

[0011] The metal chain conveyor belt is set between the billet roller conveyor and the ladder chain conveyor belt to transport the iron oxide scale on the billet roller conveyor to the ladder chain conveyor belt. Each ladder conveyor belt sends the iron oxide scale it is transporting into the hopper equipped with a weighing sensor.

[0012] Furthermore,

[0013] The aforementioned method of adjusting the transmission of the ladder chain conveyor based on the real-time amount of iron oxide scale falling off the roller conveyor is as follows:

[0014]

[0015] In the formula,

[0016] V T Speed ​​of a ladder-type chain conveyor belt, unit: level / second;

[0017] G: Real-time amount of iron oxide scale falling off the roller conveyor, unit: kg;

[0018] T P : The current time for the billet to pass through the roller conveyor, in seconds;

[0019] W L : Amount of iron oxide scale transported at each stage, in kg.

[0020] Furthermore,

[0021] The amount of iron oxide scale transported in each stage, W L The weight of each stage filled with iron oxide scale is used as a benchmark, taking into account the non-uniform filling of each stage in actual operation.

[0022] Furthermore,

[0023] The real-time amount of iron oxide scale falling off the roller conveyor is determined according to the following formula:

[0024] G = G P ×W0×K1×K2,

[0025] In the formula,

[0026] G: Real-time amount of iron oxide scale falling off the roller conveyor, unit: kg;

[0027] G P : The surface area of ​​the billet currently passing through the roller conveyor, in m² 2 ;

[0028] W0: Amount of iron oxide scale outside the furnace, unit: kg;

[0029] K1: Factor affecting burn-off temperature;

[0030] K2: Factor affecting burn-off time.

[0031] Furthermore,

[0032] The real-time amount of iron oxide scale falling off the roller conveyor is determined according to the following formula:

[0033] G = G P ×W0×K1×K2×K3,

[0034] In the formula,

[0035] G: Real-time amount of iron oxide scale falling off the roller conveyor, unit: kg;

[0036] G P : The surface area of ​​the billet currently passing through the roller conveyor, in m² 2 ;

[0037] W0: Amount of iron oxide scale outside the furnace, unit: kg;

[0038] K1: Factor affecting burn-off temperature;

[0039] K2: Factor affecting burn-off time;

[0040] K3: Correction coefficient.

[0041] Furthermore,

[0042] The amount of iron oxide scale W0 outside the furnace is determined according to the following formula:

[0043] W0 = P B ×W′0,

[0044] In the formula,

[0045] W0: Amount of iron oxide scale outside the furnace, unit: kg;

[0046] P B : Standard for the proportion of iron oxide scale outside the furnace;

[0047] W′0: Actual measured amount of iron oxide scale outside the furnace, unit: kg.

[0048] Furthermore,

[0049] The aforementioned furnace exterior iron oxide scale ratio benchmark PB The amount of iron oxide scale removed from the roller conveyor and the amount of iron oxide scale removed from the heating furnace during each major overhaul is determined based on these figures.

[0050] Furthermore,

[0051] The aforementioned furnace exterior iron oxide scale ratio benchmark P B This serves as a cyclical reference point, with each major overhaul representing a cycle.

[0052] Furthermore,

[0053] The specific steps for determining the burn-off temperature influence factor K1 are as follows:

[0054] S11: Statistics on the standard temperatures of each process;

[0055] S12: Based on the standard temperatures of each process, conduct corresponding heating tests on the billet and measure the amount of iron oxide scale corresponding to each standard temperature of the process.

[0056] S13: Based on the standard temperature of each process and the corresponding amount of iron oxide scale, complete the sequence expression of the burn-off temperature factor and form a burn-off temperature factor sequence table corresponding to each standard temperature of the process;

[0057] S14: Based on the actual operating temperature, the corresponding burn-off temperature factor is determined by indexing the corresponding process standard temperature.

[0058] Furthermore,

[0059] Step S13 specifically involves: using the measured amount of iron oxide scale corresponding to any process standard temperature as a benchmark, dividing the amount of iron oxide scale corresponding to each process standard temperature by the benchmark amount of iron oxide scale to obtain the temperature burn-off factor at each process standard temperature.

[0060] Furthermore,

[0061] The burn-off time influencing factor K2 is determined according to the following steps:

[0062] First, based on the linear relationship between heating time and oxidation loss, the linear relationship between the factors influencing heating time and burn-off time was determined.

[0063] Secondly, based on the actual heating time and the established linear relationship, the corresponding factors affecting burn-off time are determined.

[0064] Furthermore,

[0065] The specific steps for determining the burn-off time influencing factor K2 are as follows:

[0066] S21: Take two heating times t1 and t2, and measure the corresponding iron oxide scale amounts W′1 and W′2 at the same temperature;

[0067] S22: Normalize the data based on either W′1 or W′2.

[0068] S23: Based on the two-point equation, determine the linear relationship between the heating time and the burn-off time influencing factors by finding the equation of the straight line;

[0069] S24: Substitute the actual heating time into the linear relationship expression.

[0070] Furthermore,

[0071] Using W′1 as the baseline between W′1 and W′2, normalization is performed, and the linear relationship between the heating time and burn-off time influencing factors is expressed as follows:

[0072]

[0073] In the formula,

[0074] K2: Factor affecting burn-off time;

[0075] t: Actual heating time, in seconds;

[0076] t1: The first heating time used to determine the linear relationship, in seconds;

[0077] t2: The second heating time used to determine the linear relationship, in seconds;

[0078] α1: The iron oxide scale amount factor corresponding to the first heating time, with a value of:

[0079] α2: Iron oxide scale amount factor corresponding to the second heating time, with a value of:

[0080] Furthermore,

[0081] The correction coefficient K3 is determined according to the following steps:

[0082] S31: Calculate the difference between the amount of iron oxide scale in the recycling hopper and the real-time amount of iron oxide scale falling off the roller conveyor.

[0083] S32: When the difference between two consecutive set number of workpieces exceeds the set threshold, the correction coefficient update is triggered; otherwise, the current correction coefficient is maintained.

[0084] Furthermore,

[0085] The steps to trigger the update of the correction coefficients are as follows:

[0086] When the difference between the amount of iron oxide scale in the corresponding recycling hopper of a continuously set number of workpieces and the real-time amount of iron oxide scale falling from the roller conveyor exceeds a set threshold, the total amount of iron oxide scale G entering the recycling hopper of all workpieces within the set period is calculated. CS And the corresponding real-time total amount of iron oxide scale falling off the roller conveyor, G S Then, the corresponding correction coefficients are calculated and updated according to the correction rules established by the following set of inequalities:

[0087]

[0088] In the formula,

[0089] K3: Correction coefficient;

[0090] K′3: Initial correction coefficient, with a value of 1;

[0091] ΔK: Adjustment coefficient, determined according to the monitoring cycle;

[0092] G S : Total amount of iron oxide scale entering the recycling hopper from all root workpieces, G S =∑G i Unit: kg;

[0093] G CS : The total amount of iron oxide scale falling off the roller conveyor in real time for all root workpieces, G CS =∑G Ci Unit: kg;

[0094] ΔG: Set threshold, unit: kg;

[0095] i: Total number of workpieces.

[0096] This invention discloses an intelligent method for recycling iron oxide scale from steel rolling, which enables real-time collection of scale shedding and can adapt to different operating conditions and scale shedding volumes. The method achieves intelligent calculation of iron oxide scale generation and automatic recycling, allowing operators to quantitatively manage iron oxide scale byproducts during the steel rolling process, improving the production environment, reducing labor intensity, and enhancing the quality of iron oxide scale recycling. Attached Figure Description

[0097] Figure 1 A schematic diagram of the steps for determining the burn-off temperature influence factor K1 in this invention;

[0098] Figure 2 This is a schematic diagram illustrating the steps for determining the burn-off time influence factor K2 in this invention;

[0099] Figure 3 This is a schematic diagram illustrating the steps for determining the correction coefficient K3 in this invention;

[0100] Figure 4 This is a schematic diagram of the spatial arrangement structure between the recycling hopper, the billet roller conveyor, the metal chain conveyor belt, and the ladder chain conveyor belt in this invention.

[0101] Figure 5 This is a schematic diagram of the metal chain plate in this invention;

[0102] Figure 6 This is a schematic diagram of the ladder-type chain conveyor belt in this invention. Detailed Implementation

[0103] The following is a further detailed description of a method for intelligently recycling rolled steel oxide scale according to the present invention, based on the accompanying drawings and specific embodiments.

[0104] Working principle and process:

[0105] This invention is achieved through, as follows Figure 4 The setup shown completes the recycling process. Specifically, a sloping trench is set up next to the billet roller conveyor, and a metal chain conveyor belt is installed inside the trench (see actual picture). Figure 5 This is used to collect the iron oxide scale that falls off the roller conveyor and transport it to the end of the trough; a ladder-type chain conveyor belt is installed at the downstream end of the trough (see actual picture). Figure 6 The conveyor belt carries the iron oxide scale back to the ground and into the hopper. A weighing sensor below the hopper measures the weight of the recovered iron oxide scale and sends it to the data processing module. The data reading module reads relevant data from the rolling mill control system and sends it to the data processing module. The data processing module calculates and processes the data, controlling the torque of the metal chain conveyor belt and the speed of the ladder chain conveyor belt to ensure smooth collection of the iron oxide scale into the hopper. Finally, the relevant information is sent to the data display module for display.

[0106] In the above-mentioned metal chain conveyor belt, a constant speed control is used to maintain torque in order to prevent the iron oxide scale from caking and sticking; while in the ladder chain conveyor belt, a variable speed control is used to adjust the speed according to the amount of iron oxide scale in order to ensure that all iron oxide scale is collected and does not fall off.

[0107] The control methods in the data processing module include three parts: calibration, calculation, and correction.

[0108] The calibration process includes the following steps:

[0109] A calibration

[0110] The direct cause of iron oxide scale formation when billets are heated in a furnace for a long time is to predict the amount of iron oxide scale that will fall off the billets. It is necessary to calibrate various factors such as the formation and fall of iron oxide scale on the billets.

[0111] A1 burn-out temperature affects calibration (the following understanding can be combined with...) Figure 1 conduct)

[0112] Heating temperature has a significant impact on billet oxidation; as the temperature increases, the amount of iron oxide scale on the billet surface increases rapidly. Because the relationship between temperature and burn-off exhibits a complex nonlinearity, it is difficult to summarize it with a simple formula. However, considering that only a few standard process temperatures are typically used to heat the billet in actual production, a tabular method can be used to calculate the burn-off temperature factor K1.

[0113] Different process temperatures can be categorized into M types, from lowest to highest. The value of M can be determined according to the type of process. If there are too many types, similar temperatures can be combined. Generally, M should not be less than 3. For each type, at the corresponding temperatures T1, T2, ... T... (M-1) T (M) By conducting heating experiments, the amount of iron oxide scale on the billet, W1, W2, ..., W, can be measured. (M-1) W M Using the amount of iron oxide scale W1 at temperature T1 as a baseline, dividing all iron oxide scale amounts by W1 yields the burn-off temperature factor K. 11 K 12 , ..., K 1(M-1) K 1M K 11 =1. In subsequent calculations, the burn-off temperature factor K1 can be found based on the temperature.

[0114] A2 burn-out time affects calibration (the following understanding can be combined with...) Figure 2 conduct)

[0115] Besides heating temperature, heating time also has a significant impact on the oxidation of the billet. Compared to the exponential effect of heating temperature on burn-off, heating time is generally linearly related to oxidation burn-off. Especially in actual production, the billet enters the heating furnace for at least several hours, and the oxidation process tends to be uniform. A linear equation can be used to define the burn-off time factor K2.

[0116] Taking two typical heating times t1 and t2, the amount of iron oxide scale W′1 and W′2 can be experimentally measured at the same temperature. Normalizing using W′1 as the benchmark yields 1. These are represented as iron oxide scale factor α1, α2.

[0117] Therefore, the burn-off time factor K2 under heating time T in subsequent calculations can be expressed as:

[0118]

[0119] A3 Furnace External Iron Oxide Scale Proportion Calibration

[0120] Iron oxide scale is generated inside the heating furnace, but usually only a small portion falls into the furnace; most is carried out by the billet and enters the roller conveyor. The proportion of iron oxide scale outside the furnace, P... B It is difficult to accurately count the amount of iron oxide scale (G) that is removed from the roller conveyor during major overhauls, and the amount of scale varies from piece to piece. R The amount of iron oxide scale removed from the heating furnace (G) F Calculations show that PB is a periodically changing benchmark that changes periodically with each major overhaul:

[0121]

[0122] A4 Furnace External Iron Oxide Scale Standard Measurement Calibration

[0123] After the aforementioned steps, the baseline amount of iron oxide scale outside the furnace, W0, can be calibrated. The billet is heated at temperature t1 for time T1, and the amount of iron oxide scale, W′0, is measured. Therefore, we can obtain:

[0124] W0 = P B W′0

[0125] A5 conveyor belt cascade capacity calibration

[0126] Since this invention uses a conveyor belt to recover iron oxide scale, it is necessary to calibrate the conveying capacity W of each stage. L The transport weight L of each step can be measured by placing iron oxide scale on the step, then removing the scale and weighing it to obtain the weight W′. L Considering that iron oxide scale is often not evenly distributed during actual operation, the transport weight L of each stage can be 0.4 times W′ based on the actual working conditions. L Up to 0.6 times W′ L To retrieve values, we follow the rule: W L =0.5W′ L Here are some examples.

[0127] B calculation

[0128] B1 Calculates the burn-off temperature factor K1

[0129] The data processing module reads the current billet heating temperature t from the rolling line control computer through the data communication module, and the burn-off temperature factor K1 can be obtained by looking up the table.

[0130] B2 Burn-off Time Factor K2

[0131] The data processing module reads the current billet heating time T from the rolling line control computer through the data communication module, and can calculate the burn-off temperature factor K2.

[0132]

[0133] B3 Calculates the amount of iron oxide scale falling off the roller conveyor (G)

[0134] G = G P W0K1K2K3

[0135] Among them: G P K is the surface area of ​​the billet currently passing through the roller conveyor; K3 is the self-correction coefficient, with an initial value of 1.

[0136] B4 Calculate the conveyor belt speed V T

[0137]

[0138] Wherein: T P The time it takes for the billet to pass through the roller conveyor can be read from the rolling mill control computer, or it can be calculated automatically using the billet length and roller speed.

[0139] C correction

[0140] In practical use, factors such as instrument aging and process adjustments can cause the system error after calibration to increase continuously over time, eventually accumulating to an unacceptable level for the user. Therefore, real-time periodic monitoring and deviation correction are essential. In this invention, the system preferably updates the corresponding correction coefficients based on real-time periodic monitoring during use.

[0141] Calculating the burn loss of the billet is the benchmark for the system calculation and needs to be as accurate as possible. However, the actual burn loss is always changing dynamically. Frequent quantitative iron oxide scale tests are too costly. This invention uses the weight sensor of the hopper to correct the burn loss error, which is low in cost and effective.

[0142] Theoretically, the amount of iron oxide scale collected in the hopper, G C The value should be close to the calculated value G. If two values ​​differ significantly for j consecutive workpieces, the system needs calibration. Take the total amount of iron oxide scale in the hopper for all i workpieces within a certain period, G. CS and the total calculated value G S .

[0143] G CS =∑G Ci

[0144] G S =∑G i

[0145] The new self-correction coefficient K3 can be calculated as follows:

[0146]

[0147] in,

[0148] K3: Correction coefficient;

[0149] K′3: Initial correction coefficient, with a value of 1;

[0150] ΔK: Adjustment coefficient, determined according to the monitoring cycle, usually taken as 0.1K′3;

[0151] G S : Total amount of iron oxide scale entering the recycling hopper from all root workpieces, G S =∑G i Unit: kg;

[0152] G CS : The total amount of iron oxide scale falling off the roller conveyor in real time for all root workpieces, G CS =∑G Ci Unit: kg;

[0153] ΔG: Set threshold, unit: kg; ΔG is the dead zone. Since the theoretically calculated amount of iron oxide scale falling off and the amount collected by the hopper are usually not completely consistent, a dead zone needs to be set. Its value depends on the dryness of the hopper, the condition of the trench, and the sensor error. Generally speaking, ΔG should not be greater than 0.2G. CS

[0154] i: Total number of workpieces. Specific Implementation

[0156] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0157] In accordance with Figure 1 After the automatic recycling settings are completed as shown, the metal chain conveyor belt (such as...) Figure 2 The iron oxide scale that falls from the billet on the collection roller conveyor is transported to the end of the trough via a stepped chain conveyor (such as...). Figure 3 The iron oxide belt is brought back to the ground, and the data processing module controls the operation of the entire system.

[0158] The calculations in the data processing module include three parts: calibration, calculation, and correction.

[0159] The calibration package includes the following steps:

[0160] A calibration

[0161] A1 Burn-off Temperature Affects Calibration

[0162] The heating temperatures of a certain rolling mill product are mainly concentrated at 800, 1000, and 1200 degrees Celsius. Therefore, it can be divided into three categories according to the temperature from lowest to highest. For each category, heating experiments were conducted at the corresponding temperatures T1 = 800℃, T2 = 1000℃, and T3 = 1200℃. The amount of iron oxide scale on the billet was measured to be W1 = 111 g / m³. 2 W2 = 415 g / m 2 W2 = 1083 g / m 2 The amount of iron oxide scale at temperature T1 = 800℃ is W1 = 111 g / cm³. 2 Based on W1, the burn-off temperature factor K can be obtained by dividing all the iron oxide scale amounts by W1. 11 =1,K 12 =3.74,K 13 = 9.76, where K 11 =1. In subsequent calculations, the burn-off temperature factor K1 can be found based on the temperature.

[0163] A2 burn-out time affects calibration

[0164] Taking two typical heating times, t1 = 180 min and t2 = 240 min, at the same temperature of 800 degrees Celsius, the amount of iron oxide scale W′1 can be experimentally measured to be 111 g / m³. 2 W′2=125g / m 2 Normalization using W′1 as the benchmark yields iron oxide scale quantity factors α1=1, α2=1.13.

[0165] A3 Furnace External Iron Oxide Scale Proportion Calibration

[0166] During major overhaul, the amount of iron oxide scale (G) removed from the roller conveyor was recorded. R The amount of iron oxide scale removed from the heating furnace (G) F P can be obtained B =0.81.

[0167] A4 Furnace External Iron Oxide Scale Standard Measurement Calibration

[0168] After the aforementioned steps, the baseline amount of iron oxide scale outside the furnace, W0, can be calibrated. The billet is heated at a temperature of T1 = 800℃ for t1 = 180 min, and the amount of iron oxide scale, W′0 = 111 g / m³, is measured. 2 Therefore, we can conclude that:

[0169] W0 = P B W′0=90g / m 2

[0170] B calculation

[0171] B1 Calculates the burn-off temperature factor K1

[0172] The data processing module reads the current billet heating temperature t = 1000℃ from the rolling line control computer through the data communication module. By looking up the table, the burn-off temperature factor K1 = 3.74 can be obtained.

[0173] B2 Burn-off Time Factor K2

[0174] The data processing module reads the current billet heating time t = 210 min from the rolling line control computer via the data communication module. Calculations can then be performed to obtain...

[0175]

[0176] B3 Calculates the amount of iron oxide scale falling off the roller conveyor (G)

[0177] The surface area G of the billet passing through the current roller conveyor P =15.7m 2 The self-correction coefficient K3 = 1.

[0178] G = G P W0K1K2K3=5.65kg

[0179] B4 Calculate the conveyor belt speed V T

[0180]

[0181] Wherein: T P =10s.

[0182] C correction

[0183] If two values ​​differ significantly for 10 consecutive workpieces (j=10), the system needs calibration. The total amount of iron oxide scale (G) in the hopper for all 1000 workpieces (i=1000) over 5 days is taken. CS and the total calculated value G S .

[0184] G CS =∑G Ci =5t

[0185] G S =∑G i =3.8t

[0186] The new self-correction coefficient K3 can be calculated as follows:

[0187] K3=K′3+ΔK

[0188] In this configuration, K′3 = 1 before updating the correction coefficients; ΔK is set to 0.1K′3; and ΔG is set to 0.2G. CS .

[0189] K3 = 1.1.

Claims

1.A method for recycling mill scale, characterized in that: between the recycling hopper and the billet roller, a metal chain plate conveyor is arranged in cooperation with a gradient chain conveyor, and the gradient chain conveyor is controlled in speed according to the real-time amount of mill scale falling from the roller to complete the recycling of mill scale outside the furnace; a groove with a slope conveying direction is arranged beside the billet roller, and a metal chain plate conveyor is arranged in the groove; the metal chain plate conveyor is arranged between the billet roller and the gradient chain conveyor to convey the mill scale on the billet roller to the gradient chain conveyor, and each step of the gradient chain conveyor sends the mill scale conveyed by itself into the hopper with a weighing sensor; the gradient chain conveyor is controlled in speed according to the real-time amount of mill scale falling from the roller, and the control is specifically: wherein G: the real-time amount of mill scale falling from the roller, unit: kg; W: the amount of mill scale outside the furnace, unit: kg; K: the speed of the gradient chain conveyor, unit: m / min; T: the time of the gradient chain conveyor, unit: min; W0: the amount of mill scale outside the furnace, unit: kg; T0: the time of the gradient chain conveyor, unit: min; K0: the speed of the gradient chain conveyor, unit: m / min; and the control is specifically: W = G * T / K0. 2.The method according to claim 1, characterized in that: the real-time amount of mill scale falling from the roller is determined according to the following formula: wherein G: the real-time amount of mill scale falling from the roller, unit: kg; K1: a burn loss temperature influence factor; and K2: a burn loss time influence factor. 3.The method according to claim 1, characterized in that: the real-time amount of mill scale falling from the roller is determined according to the following formula: wherein G: the real-time amount of mill scale falling from the roller, unit: kg; K1: a burn loss temperature influence factor; and K2: a burn loss time influence factor. 4.The method according to claim 1, characterized in that: the real-time amount of mill scale falling from the roller is determined according to the following formula: wherein G: the real-time amount of mill scale falling from the roller, unit: kg; K1: a burn loss temperature influence factor; K2: a burn loss time influence factor; and K3: a correction coefficient. 5.The method according to claim 3 or 4, characterized in that: the amount of mill scale outside the furnace W0 is determined according to the following formula: wherein W0: the amount of mill scale outside the furnace, unit: kg; K1: a burn loss temperature influence factor; and K2: a burn loss time influence factor. 6.The method according to claim 5, characterized in that: the correction coefficient K3 is determined according to the following formula: wherein K3: a correction coefficient; and K1: a burn loss temperature influence factor. V T : speed of the escalator chain conveyor, in steps / s; 7.The method according to claim 6, characterized in that: the correction coefficient K3 is determined according to the following formula: wherein K3: a correction coefficient; K1: a burn loss temperature influence factor; and K2: a burn loss time influence factor. T P : Current billet time through roller, unit: S; W L : Transport of iron oxide scale per step in kg. 8.The method according to claim 3 or 4, characterized in that: the burn loss temperature influence factor K1 is determined according to the following steps: S11: statistics of each process standard temperature; S12: based on each process standard temperature, corresponding heating test is carried out on the billet to measure the amount of mill scale corresponding to each process standard temperature; S13: based on each process standard temperature and the corresponding amount of mill scale, a sequence representation of the burn loss temperature factor is completed, and a sequence table of the burn loss temperature factor corresponding to each process standard temperature is formed; and S14: based on the actual working temperature, the corresponding burn loss temperature factor is determined by indexing the corresponding process standard temperature. The amount of transported scale W of each step L The non-uniformity of each step in actual operation is determined based on the weight of each step filled with scale. 9.The method according to claim 7, characterized in that: step S13 is specifically: taking the measured amount of mill scale corresponding to any process standard temperature as a reference, dividing the amount of mill scale corresponding to each process standard temperature by the reference amount of mill scale to obtain the temperature burn loss factor under each process standard temperature. ​ G = G P x W0x K1x K2, ​ ​ G P : current roll table passed by the billet surface area, unit: m 2 ; W0: amount of iron scale outside the furnace, unit: g / m 2 ; ​ ​ ​ ​ G = G P x W0x K1x K2x K3, ​ ​ G P : current roll table passed billet surface area, unit: m 2 ; W0: amount of iron scale outside the furnace, unit: g / m 2 ; ​ ​ ​ ​ ​ W0 = P B x W'0, ​ W0: amount of iron scale outside the furnace, unit: g / m 2 ; P B : reference of scale of the outer-oxidized scale W0: actual measured amount of iron oxide scale outside the furnace, unit: g / m 2 . ​ The said scale proportion reference P B is determined according to the amount of scale cleaned out on the roller way and the amount of scale cleaned out in the heating furnace at each overhaul. ​ The scale outside oxidation iron proportion benchmark P B , as a periodic change benchmark with each overhaul as a cycle. ​ ​ ​ ​ ​ ​ ​ ​ 10.The method of claim 3 or 4, wherein the burning time influence factor K 2 is determined according to the following steps. Firstly, a linear relationship between the heating time and the burning time influence factor is determined based on a linear relationship between the heating time and the oxidation burning loss. Secondly, the burning time influence factor is determined according to the actual heating time and the linear relationship. 11.The method of claim 10, wherein the burning time influence factor K 2 is determined according to the following steps. S21: two heating times t 1 and t 2 are taken, and the corresponding oxide skin amounts W 1 ′ and W 2 ′ are measured at the same temperature. S22: normalization is performed based on either W 1 ′ or W 2 ′. S23: a linear relationship between the heating time and the burning time influence factor is determined according to a two-point straight line equation. S24: the actual heating time is substituted into the linear relationship. 12.The method of claim 11, wherein the linear relationship between the heating time and the burning time influence factor is determined based on W 1 ′, and is specifically as follows: wherein K 2 is the burning time influence factor, t is the actual heating time, t 1 is the first heating time, and t 2 is the second heating time. 13.The method of claim 4, wherein the correction coefficient K 3 is determined according to the following steps. S31: the difference between the oxide skin amount in the recovery hopper and the real-time oxide skin amount falling from the roll is calculated. S32: when the difference between the two exceeds a set threshold value for a continuous set number of workpieces, the updating of the correction coefficient is triggered, otherwise the current correction coefficient is maintained. 14.The method of claim 13, wherein the step of triggering the updating of the correction coefficient is specifically as follows: wherein K 3 is the correction coefficient, K ′ 3 is the initial correction coefficient and is set as 1, ΔK is the adjustment coefficient and is determined according to the monitoring period, ΔG is the set threshold value, and i is the total number of workpieces. ​ ​ ​ ​ a1: an oxide scale amount factor corresponding to the first heating time, taking a value of: a2: an oxide scale amount factor corresponding to the second heating time, taking a value of: ​ ​ ​ ​ ​ ​ When the difference between the amount of mill scale in the respective recovery hopper of the continuously set number of workpieces and the real-time amount of roll mill scale falling exceeds the set threshold value, the total amount G of mill scale in the recovery hopper of all the roots of workpieces in the set period is calculated CS and the corresponding real-time total amount G of roll mill scale falling S Then, the calculation and update of the corresponding correction coefficient are carried out according to the correction rule established by the following inequality group: ​ ​ ​ ​ G S : Total amount of mill scale entering the recycling hopper from all root workpieces, G S =∑G i , unit: kg; G CS : Total amount of all root workpieces' real-time amount of oxide scale falling off from the roller table, G CS =∑G Ci , unit: kg; ​ ​

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