A method for controlling preheating of sintering machine mixture by coupling steam and hot air

Abstract

The present invention discloses a sintering machine mixture steam and hot air coupled preheating control method, comprising the following steps: obtaining mixture humidity data, judging whether the mixture moisture content meets the humidity uniformity preset standard and the humidity integrity preset standard, and if not, adjusting the mixture moisture content; obtaining mixture temperature data, judging whether the mixture temperature meets the temperature uniformity preset standard and the temperature integrity preset standard, and if not, adjusting the mixture temperature; wherein the flow ratio of hot air and hot steam in the hot air steam coupling structure is adjustable. The present invention monitors and adjusts the humidity uniformity and overall humidity, temperature uniformity and overall temperature, ensuring that the humidity and temperature of the mixture reach the required range, and also ensuring the humidity and temperature uniformity of the mixture, with strong process consistency; hot air can neutralize the influence of hot steam on humidity, and the ratio can be adjusted as needed so that the ratio of hot air and hot steam achieves the desired effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering, in particular to a method for controlling preheating of mixed material steam and hot air coupled with sintering machine. Background Art

[0002] Before the mixture enters the sintering trolley, it is usually preheated with hot steam generated by waste heat recovery to reduce the energy consumption of subsequent sintering, thereby improving energy utilization and cost.

[0003] The current preheating method is to use steam to preheat the mixture. Since steam affects both temperature and moisture, it is difficult to accurately control and adjust the moisture and temperature of the mixture at the same time. If the moisture of the mixture is adjusted first and then the temperature of the mixture, the moisture of the mixture will be difficult to control when adjusting the temperature of the mixture. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for controlling the preheating of a sintering machine mixture by coupling steam and hot air, which can reduce the impact of temperature adjustment on the moisture content of the mixture.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A method for controlling the preheating of a sintering machine mixture by coupling steam and hot air, comprising the following steps:

[0007] Obtaining the mixture humidity data, judging whether the mixture moisture content meets the preset humidity uniformity standard and humidity integrity standard; if not, adjusting the mixture moisture content by adjusting the hot air steam coupling structure to make the mixture moisture content meet the preset humidity uniformity standard and humidity integrity standard;

[0008] Obtaining mixture temperature data, determining whether the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard; if not, adjusting the mixture temperature by adjusting the hot air steam coupling structure to make the mixture temperature meet the preset temperature uniformity standard and the temperature integrity preset standard;

[0009] The hot air and steam coupling structure is used to mix the hot air and hot steam and send them into the mixing hopper, and the flow ratio of the hot air and hot steam is adjustable.

[0010] Furthermore, the hot air steam coupling structure includes a mixer and a connecting pipe; the mixer is provided with a hot air inlet pipe and a steam inlet pipe; the connecting pipe is provided with multiple ones and arranged along the circumference of the mixing hopper, one end of the connecting pipe is connected to the mixer, and the other end is connected to the mixing chamber; wherein the steam inlet pipe and the hot air inlet pipe are respectively installed with a first regulating valve and a second regulating valve; the connecting pipe is installed with a third regulating valve; the flow ratio of hot air and hot steam can be adjusted by adjusting the first regulating valve and the second regulating valve.

[0011] Furthermore, it also includes:

[0012] The distributor is divided into i monitoring areas Li along the width direction of the distributor, and one cross section of the mixing hopper is divided into i adjustment areas Yi along the width direction of the mixing hopper. The monitoring areas Li correspond to the adjustment areas Yi one-to-one, and i is a positive integer greater than 1;

[0013] The method of obtaining the mixture humidity data and determining whether the moisture content of the mixture meets the preset humidity uniformity standard and the humidity integrity standard, and if not, adjusting the moisture content of the mixture by adjusting the hot air steam coupling structure so that the moisture content of the mixture meets the preset humidity uniformity standard and the humidity integrity standard, specifically includes:

[0014] A1, the conditioning area Yi is divided into two sub-processing areas along the length direction of the mixing hopper;

[0015] A2, obtaining the current moisture content Si of the mixture in each monitoring area Li on the distributor, and determining whether the current moisture content Si of the mixture in each monitoring area Li meets the preset standard for humidity uniformity; if the current moisture content Si of the mixture in one or more monitoring areas Li does not meet the preset standard for humidity uniformity, then the monitoring areas Li that do not meet the preset standard for humidity uniformity are determined as areas requiring humidity adjustment, moisture levels of the sub-processing areas corresponding to the areas requiring humidity adjustment are monitored, and the third regulating valves of the sub-processing areas corresponding to the areas requiring humidity adjustment are adjusted based on the monitoring data until the current moisture content Si of the mixture in all monitoring areas Li meet the preset standard for humidity uniformity;

[0016] A3, determine whether the current moisture content Si of the mixture in all monitoring areas Li meets the preset standard for humidity integrity; if not, adjust the first regulating valve and / or the second regulating valve until the current moisture content Si of the mixture in all monitoring areas Li meets the preset standard for humidity integrity.

[0017] Furthermore, the preset standard for humidity integrity is that the difference between the overall average moisture content W1 of all monitoring areas Li and the target moisture content W is not greater than a first preset threshold value e1;

[0018] If the above is not met, the first regulating valve and / or the second regulating valve are adjusted, specifically including:

[0019] A31, if the overall average moisture content W1 is greater than the target moisture content W and the difference is greater than a first preset threshold value e1, the first regulating valve is adjusted downward and / or the second regulating valve is adjusted upward; if the overall average moisture content W1 is less than the target moisture content W and the difference is greater than the first preset threshold value e1, the first regulating valve is adjusted upward and / or the second regulating valve is adjusted downward;

[0020] A32, return to step A2.

[0021] Furthermore, when step A31 is executed for the first time, the first regulating valve is adjusted, and the adjustment amount of the first regulating valve is G1 = |W1-W| × A × B1, where A is the opening adjustment amount of the first regulating valve corresponding to a unit moisture change, and B1 is the primary humidity adjustment coefficient; when step A31 is executed for the second time and thereafter, the second regulating valve is adjusted, and the adjustment amount of the second regulating valve is H1 = |W1-W| × a × B2, where a is the opening adjustment amount of the second regulating valve corresponding to a unit moisture change, and B2 is the secondary humidity adjustment coefficient, and B1>B2.

[0022] Furthermore, the method of obtaining the mixture temperature data and determining whether the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard is described. If not, the method of adjusting the mixture temperature by adjusting the hot air steam coupling structure so that the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard is described. Specifically, the method includes:

[0023] S1, obtaining the current temperature Ti of the mixture in each monitoring area Li on the distributor, and determining whether the current temperature Ti of the mixture in each monitoring area Li meets the preset temperature uniformity standard; if the current temperature Ti of the mixture in one or more monitoring areas Li does not meet the preset temperature uniformity standard, the monitoring areas Li that do not meet the preset temperature uniformity standard are determined to be areas requiring temperature adjustment, and the third regulating valves corresponding to the areas requiring temperature adjustment are adjusted until the current temperature Ti of the mixture in all monitoring areas Li meet the preset temperature uniformity standard;

[0024] S2, obtain the current temperature Ti of the mixture in each monitoring area Li, and determine whether the current temperature Ti of the mixture in all monitoring areas Li meets the preset temperature integrity standard; if not, adjust the first regulating valve and the second regulating valve at the same time until the current temperature Ti of the mixture in all monitoring areas Li meets the preset temperature integrity standard.

[0025] Furthermore, the preset standard for temperature integrity is that the difference between the current overall average temperature K1 of all monitoring areas Li and the target temperature K is not greater than a second preset threshold value e2;

[0026] If the above is not met, the first regulating valve and the second regulating valve are adjusted simultaneously, specifically including:

[0027] S21, determine whether step A31 has been executed. If step A31 has not been executed, proceed to step S25; if step A31 has been executed, proceed to step S22;

[0028] S22, determine the interval time T between the current time and the first execution of step A31 间 Is it less than the temperature adjustment time delay t?

[0029] If T 间 is less than t, and when step A31 is executed for the first time, the first regulating valve is adjusted upward by G1, then step S23 is entered;

[0030] If T 间 is less than t, and when step A31 is executed for the first time, the first regulating valve is adjusted downward by G1, then step S24 is entered;

[0031] If T 间 If it is not less than t, then go to step S25;

[0032] S23, determining whether the current overall average temperature K1 is greater than the target temperature K;

[0033] If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted upward by G2 and the second regulating valve is adjusted upward by H2; then after waiting for time t, the process returns to S1;

[0034] If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted downward by G3 and the second regulating valve is adjusted downward by H3; then after waiting for time t, the process returns to S1;

[0035] S24, determining whether the current overall average temperature K1 is greater than the target temperature K;

[0036] If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted upward by G4 and the second regulating valve is adjusted upward by H4; then after waiting for time t, the process returns to S1;

[0037] If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted downward by G5 and the second regulating valve is adjusted downward by H5; then after waiting for time t, the process returns to S1;

[0038] S25, determining whether the current overall average temperature K1 is greater than the target temperature K;

[0039] If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted upward by G6δ i , the second regulating valve increases H6δ i ; Then wait for time t and return to S1; if the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold e2, the first regulating valve is lowered G6δ i , the second regulating valve lowers H6δ i ; Then after waiting for time t, return to S1;

[0040] Among them, G2, H2, G3, H3, G4, H4, G5, H5, G6, and H6 satisfy the following formula:

[0041] G2=μ(K-K1-K2)×a×b1;

[0042] H2=γ(K-K1-K2)×a2×b1;

[0043] G3=μ(K1+K2-K)×a×b1;

[0044] H3=γ(K1+K2-K)×a2×b1;

[0045] G4=μ(K-K1+K2)×a×b1;

[0046] H4=γ(K-K1+K2)×a2×b1;

[0047] G5=μ(K1-K2-K)×a×b1;

[0048] H5=γ(K1-K2-K)×a2×b1;

[0049] G6=μ|K-K1|×a×b1;

[0050] H6=γ|K-K1|×a2×b1;

[0051] Where a is the adjustment amount of the first regulating valve corresponding to a unit temperature change, μ is the ratio coefficient of the first regulating valve, a2 is the adjustment amount of the second regulating valve corresponding to a unit temperature change, γ is the ratio coefficient of the second regulating valve, b1 is the primary temperature adjustment coefficient; K2 is the temperature of the mixture affected by the adjustment amount of the first regulating valve being G1; δ i is the adjustment coefficient of the i-th execution of S21, where δ1=1, δ i >δ i+1 .

[0052] Furthermore, when the first regulating valve and the second regulating valve are adjusted simultaneously in step S23, step S24, and step S25, a humidity stability relationship must be satisfied; the humidity stability relationship is:

[0053] q z ×ΔQ z ×ρ z ×w h =ΔQ r ×ρ r ×w r ;

[0054] q z , ΔQ z , ρ z 、w h , ΔQ r , ρ r 、w r They are steam humidity, steam flow change, steam average density, mixture water absorption rate, hot air flow change, hot air average density, and hot air water absorption rate.

[0055] Furthermore, the first preset threshold e1 is a moisture content of 0.5% to 1%, and the second preset threshold e2 is 2 to 3°C.

[0056] Furthermore, the temperature t2 of the mixture after being heated by the hot air steam coupling structure satisfies the following relationship:

[0057] t2=[(t r -t0)×c r ×Q r ×ρ r +((t z -t0)×c z +2500)×Q z ×ρ z ]×k÷(v h ×c h )+t0;

[0058] t r ,t0,c r , Q r , ρ r , t z 、c z , Q z , ρ z , k, v h 、c h They are hot air temperature, initial temperature of mixture, average specific heat of hot air at constant pressure, hot air flow, average density of hot air, steam temperature, average specific heat of steam at constant pressure, steam flow, average density of steam, heat absorption rate of mixture, feeding speed of mixture, and average specific heat of mixture.

[0059] The present invention has the following beneficial effects: the humidity uniformity and the overall humidity, temperature uniformity and overall temperature are monitored and adjusted to ensure that the humidity and temperature of the mixture reach the required range, and also ensure the humidity and temperature uniformity of the mixture, with strong process consistency; and instead of simply using hot steam for preheating, a hot air and hot steam coupling structure is used to mix the hot air and hot steam and send them into the mixing hopper, and the hot air can neutralize the influence of the hot steam on the humidity, that is, when it is necessary to increase the temperature, the hot steam can be increased while the hot air is increased, and increasing the hot air can increase the temperature while taking away part of the humidity of the hot steam, thereby neutralizing the influence of the hot steam on the moisture content of the mixture and reducing the influence on the moisture content of the mixture during temperature adjustment; and the flow ratio of the hot air and the hot steam is adjustable, and the ratio can be adjusted as needed so that the ratio of the hot air and the hot steam achieves the required effect, such as slightly increasing the moisture content of the mixture while increasing the temperature of the mixture or maintaining the humidity of the mixture while cooling the mixture.

[0060] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0062] Figure 1 is a flow chart of one embodiment of the present invention;

[0063] Figure 2 is a humidity regulation flow chart of the present invention;

[0064] Figure 3 It is a temperature regulation flow chart of the present invention;

[0065] Figure 4 It is a structural diagram of a method for implementing a sintering machine mixed material steam and hot air coupled preheating control method;

[0066] Figure 5 is a schematic diagram of the regulatory region;

[0067] Figure 6 Schematic diagram of the connection structure of the first annular branch pipe and the second annular branch pipe;

[0068] Figure 7 is a schematic diagram of the monitoring area. DETAILED DESCRIPTION

[0069] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0071] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0072] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0073] Please refer to Figure 1 In a preferred embodiment of the present invention, a method for controlling the preheating of a sintering machine mixture by coupling steam and hot air comprises the following steps:

[0074] Obtaining the mixture humidity data, judging whether the mixture moisture content meets the preset humidity uniformity standard and humidity integrity standard; if not, adjusting the mixture moisture content by adjusting the hot air steam coupling structure to make the mixture moisture content meet the preset humidity uniformity standard and humidity integrity standard;

[0075] Obtaining mixture temperature data, determining whether the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard; if not, adjusting the mixture temperature by adjusting the hot air steam coupling structure to make the mixture temperature meet the preset temperature uniformity standard and the temperature integrity preset standard;

[0076] The hot air and steam coupling structure is used to mix the hot air and hot steam and send them into the mixing hopper, and the flow ratio of the hot air and hot steam is adjustable.

[0077] The present invention provides a sintering machine mixture steam and hot air coupling preheating control method, which monitors and adjusts the humidity uniformity and overall humidity, temperature uniformity and overall temperature, ensures that the humidity and temperature of the mixture reach the required range, and also ensures the humidity and temperature uniformity of the mixture, with strong process consistency; and does not simply use hot steam for preheating. A hot air and hot steam coupling structure is used to mix the hot air and hot steam and send them into the mixing hopper. The hot air can neutralize the influence of the hot steam on the humidity, that is, when it is necessary to increase the temperature, the hot steam can be increased while the hot air is increased. Increasing the hot air can increase the temperature and take away part of the humidity of the hot steam, thereby neutralizing the influence of the hot steam on the moisture content of the mixture and reducing the influence on the moisture content of the mixture when the mixture temperature is adjusted; and the flow ratio of the hot air and the hot steam is adjustable, and the ratio can be adjusted as needed so that the ratio of the hot air and the hot steam achieves the desired effect, such as slightly increasing the moisture content of the mixture while increasing the temperature of the mixture or maintaining the humidity of the mixture while cooling the mixture.

[0078] Reference Figure 5 and Figure 6 Optionally, in order to achieve an adjustable ratio of hot air and hot steam, and to achieve multi-position uniform preheating of the mixture in the mixing hopper, in the present invention, the hot air and steam coupling structure includes a mixer 300 and a connecting pipe 210; the mixer 300 is provided with a hot air inlet pipe 310 and a steam inlet pipe 320; the hot air inlet pipe 310 is used to connect the hot air to the mixer 300 to introduce hot air, and the steam inlet pipe 320 is used to connect the steam to the mixer 300 to introduce steam, the mixer 300 is used to mix the introduced hot air and steam, and the mixer 300 has a mixing output pipe 330 to transport the mixed hot air and steam out; the mixer 300 belongs to the existing technology, and the specific mixer form can be selected from the existing technology according to needs. In this embodiment, the mixer 300 can select a static tube mixer. Multiple connecting pipes 210 are provided and arranged along the circumference of the mixing hopper. One end of the connecting pipe 210 is connected to the mixer 300, and the other end is connected to the mixing chamber of the mixing hopper 100. The steam inlet pipe 320 and the hot air inlet pipe 310 are respectively installed with a first regulating valve 321 and a second regulating valve 311. The connecting pipe 210 is also installed with a third regulating valve 213. The flow ratio of the hot air and hot steam can be adjusted by adjusting the first regulating valve 321 and the second regulating valve 311. The connecting pipes 210 are arranged in a ring and surround the mixing hopper 100 to achieve multi-position heating and improve heating uniformity. The third regulating valve 213 is provided on each connecting pipe 210, so each connecting pipe 210 can be independently controlled to achieve uniform heating. For example, if the temperature in a certain area is lower than that in other areas, the opening of the third regulating valve 213 of the connecting pipe 210 corresponding to that area can be increased to achieve uniform preheating.

[0079] The hot air and steam coupling structure also includes a first annular branch pipe 200, which is arranged around the outer periphery of the mixing hopper 100 and communicates with the output end of the mixing output pipe 330 to receive hot air and hot steam. Multiple connecting pipes 210 are provided and arranged along the extension direction of the first annular branch pipe 200. One end of the connecting pipe 210 is connected to the first annular branch pipe 200, and the other end is connected to the mixing chamber to pass hot air and hot steam into the mixing chamber to preheat the material in the mixing chamber. The first annular branch pipe 200 extends in a circular manner to facilitate the installation and arrangement of the surrounding connecting pipes 210.

[0080] Hot steam regulation can be achieved by adjusting the first regulating valve 321 on the steam inlet pipe 320, and hot air can be achieved by adjusting the second regulating valve 311 on the hot air inlet pipe 310. Increasing hot steam can increase the moisture content of the mixture and increase the temperature, while increasing hot air can reduce the moisture content of the mixture and increase the temperature. By utilizing the characteristics of the two types of regulation, multiple regulation purposes can be achieved through the coordination of the two types of regulation. When it is necessary to increase the moisture content of the mixture as a whole, the flow rate of the steam inlet pipe 320 can be increased or the flow rate of the hot air inlet pipe 310 can be reduced. Conversely, when it is necessary to reduce the moisture content of the mixture, the flow rate of the steam inlet pipe 320 can be reduced or the flow rate of the hot air inlet pipe 310 can be increased, thereby achieving humidity regulation of the mixture. In addition, when it is necessary to adjust the moisture content of the mixture without requiring a large change in temperature, the temperature can be stabilized by simultaneously adjusting the flow rate of the steam inlet pipe 320 and the flow rate of the hot air inlet pipe 310. For example, when it is necessary to increase the moisture content of the mixture, if the flow rate of the steam inlet pipe 320 is increased alone, it will To increase the temperature, if the flow rate of the hot air inlet pipe 310 is reduced alone, the temperature will be reduced. Therefore, the effect of temperature can be offset by simultaneously increasing the flow rate of the steam inlet pipe 320 and reducing the flow rate of the hot air inlet pipe 310, thereby stabilizing the temperature. When it is necessary to simply increase the temperature without significantly affecting the moisture content, the flow rates of the steam inlet pipe 320 and the hot air inlet pipe 310 can be increased simultaneously. Both of these can increase the temperature. In addition, the increased moisture-reducing effect of the hot air can offset the increase in moisture content caused by the increased steam flow rate, thereby achieving a temperature increase while reducing or even eliminating the effect on moisture content. In addition, when it is necessary to adjust the moisture content of a certain area by adjusting the third regulating valve 213, the effect of the hot steam in the steam inlet pipe 320 on the moisture content is greater than the effect of the hot air in the hot air inlet pipe 310 on the moisture content. That is, by increasing the third regulating valve 213, the moisture content of the mixed material in the area corresponding to the third regulating valve 213 can be increased.

[0081] In a specific embodiment of the present invention, the connecting pipe 210 includes a horizontal pipe 211 and a vertical pipe 212; the horizontal pipe 211 extends horizontally, the vertical pipe 212 extends vertically and the upper end is connected to the first annular branch pipe 210, the lower end is connected to one end of the horizontal pipe 211, and the other end of the horizontal pipe 211 is connected to the mixing chamber, and the third regulating valve 213 is installed on the vertical pipe 212.

[0082] In a further embodiment of the present invention, a second annular branch pipe 400 is further provided. The second annular branch pipe 400 is disposed around the outer periphery of all horizontal pipes 211. The second annular branch pipe 400 is provided with a hot air nozzle 410 that is inserted into the horizontal pipe 211 along its extension direction. A fourth regulating valve 411 is mounted on the hot air nozzle 410. The spray direction of the hot air nozzle 410 is aligned with the flow direction of the horizontal pipe 211. The spray from the hot air nozzle 410 extends the spray distance of the steam and hot air mixture, preventing the mixture from clogging the horizontal pipe 211.

[0083] In a further embodiment of the present invention, a hot air supply mechanism 500 is further included, and the second annular branch pipe 400 is provided with a hot air inlet pipe 420. The hot air inlet pipe 420 and the hot air inlet pipe 310 are both connected to the hot air supply mechanism 500, that is, the second annular branch pipe 400 and the hot air inlet pipe 310 come from the same hot air source.

[0084] Reference Figure 2 In a further embodiment of the present invention, the sintering machine mixture steam and hot air coupled preheating control method further includes:

[0085] The distributor 700 is divided into i monitoring areas Li along the width direction of the distributor 700, and one cross section of the mixing hopper is divided into i adjustment areas Yi along the width direction of the mixing hopper 100. The monitoring areas Li correspond to the adjustment areas Yi one by one, and i is a positive integer greater than 1. In this embodiment, the cross section is the cross section of the horizontal pipe 211. In this embodiment, Figure 5 and Figure 7As shown, i is a positive integer of 6. There are six monitoring areas Li from left to right, namely L1, L2, L3, L4, L5, and L6. There are six adjustment areas Yi from left to right, namely Y1, Y2, Y3, Y4, Y5, and Y6. The six monitoring areas Li and adjustment areas Yi are set in a one-to-one correspondence from left to right, that is, monitoring area L1 corresponds to adjustment area Y1, and so on. The monitoring position of the mixture is divided into multiple monitoring areas Li, and the heating and humidity treatment position of the mixture is divided into multiple adjustment areas Yi. The monitoring areas Li and the adjustment areas Yi correspond to each other. That is, when the temperature or humidity of the monitoring area Li is detected to need to be increased or decreased, the third regulating valve 213 of the corresponding adjustment area Yi can be controlled to adjust it, thereby achieving precise monitoring and adjustment, and improving the accuracy and precision of the adjustment. In addition, the monitoring position is set on the distributor 700, which can more objectively reflect the state of the material discharged after preheating. If the infrared thermometer 801 and the infrared moisture detector 800 perform temperature and humidity detection on the material in the mixing hopper, it will be affected by the interference of the humidity and moisture in the mixing hopper 100, thereby affecting the accuracy of the mixture detection. The humidity and temperature of the mixture detected in the mixing hopper 100 cannot truly reflect the parameters of the mixture after being discharged from the mixing hopper. The humidity and temperature of the mixture after being discharged can most directly reflect the state of the mixture after processing. Therefore, the monitoring area Li is set on the distributor 700 and is set independently from the adjustment area Yi, which can effectively monitor the discharge state of the mixture.

[0086] Reference Figure 2 , humidity uniformity and overall adjustment methods, specifically including:

[0087] A1, the conditioning area Yi is divided into two sub-processing areas along the length of the mixing hopper; Figure 5 For example, the adjustment area Y1 is divided into a sub-processing area 1A and a sub-processing area 1B.

[0088] A2 obtains the current moisture content Si of the mixed material in each monitoring area Li on the distributor and determines whether the current moisture content Si of the mixed material in each monitoring area Li meets the preset standard for humidity uniformity. If the current moisture content Si of the mixed material in one or more monitoring areas Li does not meet the preset standard for humidity uniformity, the monitoring areas Li that do not meet the preset standard for humidity uniformity are determined to be areas requiring humidity adjustment. Moisture content is monitored in the sub-processing areas corresponding to the areas requiring humidity adjustment, and the third regulating valves 213 of the sub-processing areas corresponding to the areas requiring humidity adjustment are adjusted based on the monitoring data until the current moisture content Si of the mixed material in all monitoring areas Li meet the preset standard for humidity uniformity. That is, the current moisture content Si of the mixed material in monitoring area L1 is S1, the current moisture content of the mixed material in monitoring area L2 is S2, and so on.

[0089] A3, determine whether the current moisture content Si of the mixed material in all monitoring areas Li meets the preset standard of humidity integrity; if not, adjust the first regulating valve 321 and / or the second regulating valve 311 until the current moisture content Si of the mixed material in all monitoring areas Li meets the preset standard of humidity integrity.

[0090] Perform uniformity adjustment first, and then adjust the humidity overall after the uniformity adjustment is completed. This will prevent the humidity uniformity from being greatly affected during the overall humidity adjustment, thereby reducing the number of adjustments and the adjustment efficiency.

[0091] Specifically, the preset standard for humidity integrity is that the difference between the overall average moisture content W1 of all monitoring areas Li and the target moisture content W is no greater than a first preset threshold value e1. The preset standard for humidity uniformity is that the difference between the current moisture content Si of the mixture in all monitoring areas Li and the overall average moisture content W1 is no greater than a third preset threshold value e3. The overall average moisture content W1 is the average of the current moisture contents Si of the mixture in all monitoring areas Li.

[0092] Step A3 specifically includes:

[0093] A30, determining whether the current moisture content Si of the mixture in all monitoring areas Li meets the preset standard for humidity integrity; if not, proceed to step A31; if yes, proceed to the subsequent step (temperature adjustment);

[0094] A31, if the overall average moisture content W1 is greater than the target moisture content W and the difference is greater than the first preset threshold value e1, the first regulating valve 321 is adjusted downward and / or the second regulating valve 311 is adjusted upward; if the overall average moisture content W1 is less than the target moisture content W and the difference is greater than the first preset threshold value e1, the first regulating valve 321 is adjusted upward and / or the second regulating valve 311 is adjusted downward;

[0095] A32, return to step A2.

[0096] Through step A31, adjustment is performed according to the moisture content (humidity) difference to achieve the purpose of precise adjustment, and after each adjustment, it returns to step A2 to prevent the overall humidity adjustment from affecting the humidity uniformity and causing the humidity uniformity to not meet the standard. The humidity adjustment is completed only when the humidity uniformity and the overall average humidity meet the standards at the same time and no humidity adjustment is required.

[0097] More preferably, in the present invention, when step A31 is executed for the first time, the first regulating valve 321 is adjusted. The adjustment amount of the first regulating valve 321 is G1 = |W1-W| × A × B1, where A is the opening adjustment amount of the first regulating valve 321 corresponding to a unit moisture change, and B1 is the primary humidity adjustment coefficient. When step A31 is executed for the second time and thereafter, the second regulating valve 311 is adjusted. The adjustment amount of the second regulating valve 311 is H1 = |W1-W| × a × B2, where a is the opening adjustment amount of the second regulating valve 311 corresponding to a unit moisture change, and B2 is the secondary humidity adjustment coefficient. B1>B2, B1 is typically 85% to 90%, and B2 is typically 50% to 60%. Step A3 may be executed multiple times in a loop, with the first adjustment being a relatively large coarse adjustment, and the second and subsequent adjustments being smaller fine adjustments. The desired effect is usually achieved after the first coarse adjustment and the second fine adjustment.

[0098] Furthermore, step A2 specifically includes A21, A22 and A23.

[0099] A21, using an infrared moisture detector 800 to monitor the current moisture content Si of the mixture in the monitoring area Li in real time, determines whether the difference between the current moisture content Si of the mixture in each monitoring area Li and the overall average moisture content W1 is greater than a third preset threshold value e3; if it is detected that the difference between the current moisture content Si of the mixture and the overall average moisture content W1 in one or more monitoring areas Li is greater than the third preset threshold value e3, the monitoring area Li where the difference between the current moisture content Si of the mixture and the overall average moisture content W1 is greater than the third preset threshold value e3 is determined as a humidity adjustment area, and the process proceeds to step A22; if the difference between the current moisture content Si of the mixture and the overall average moisture content W1 in all monitoring areas Li is less than or equal to the third preset threshold value e3, the process proceeds to step A3. The setting of the third preset threshold value e3 is related to the frequency of adjustment. To ensure infrequent adjustment, the third preset threshold value e3 is preferably a moisture content of 1% to 2%.

[0100] A22, the camera 120 monitors the water vapor smoke coming out of the top of the mixing hopper, and obtains the water vapor smoke size of the sub-processing area of ​​each adjustment area Yi through the visual recognition algorithm. If the current moisture content Si of the mixed material in the area requiring humidity adjustment is greater than the overall average moisture content W1, and the water vapor smoke size of the sub-processing area corresponding to the area requiring humidity adjustment is greater than the average water vapor smoke size, the third regulating valve 213 of the sub-processing area corresponding to the area requiring humidity adjustment is adjusted to H i If the current moisture content Si of the mixed material in the humidity area to be adjusted is less than the overall average moisture content W1, and the water vapor smoke size of the sub-processing area corresponding to the humidity area to be adjusted is less than the average water vapor smoke size, then the third regulating valve 213 of the sub-processing area corresponding to the humidity area to be adjusted is adjusted H i ; Among them H iis the adjustment amount of the second regulating valve 311 during the i-th execution of step A22. For example, if monitoring area L1 is determined to require humidity adjustment, the sub-processing areas 1A and 1B corresponding to monitoring area L1 are monitored. If the water vapor and smoke level in sub-processing area 1A is detected to be below the standard, the third regulating valve 213 corresponding to sub-processing area 1A is adjusted. In this case, the adjustment of the third regulating valve 213 can result in a change in the moisture content of the mixture.

[0101] A23, return to A21. After the adjustment in step A22 is completed, return to A21 and re-monitor whether the uniformity of the moisture content in the monitoring area Li meets the standard, so as to avoid inadequate adjustment or the influence of the adjustment on other areas, resulting in substandard uniformity.

[0102] H i =|W1-W2|×C×D i ;

[0103] W2 is the current moisture content of the mixture in the area where humidity needs to be adjusted, H i is the adjustment amount of the opening of the third regulating valve 213 in the i-th execution of step A22, C is the adjustment amount of the opening of the third regulating valve 213 corresponding to a unit water content change, and D i is the adjustment coefficient of the opening of the third regulating valve 213 in the i-th execution of step A22, where D i >D i+1 i is a positive integer. Typically, two adjustments are sufficient to achieve the desired humidity: D1 = 85-90% and D2 = 50-60%. The first time step A22 is executed, the adjustment coefficient is larger, bringing the humidity close to the target. The second time, the adjustment coefficient is reduced to avoid large fluctuations caused by large adjustments. By combining coarse and fine adjustments, precise adjustment is achieved and the number of adjustments is reduced.

[0104] Since the mixture of the distributor 700 will flow downward to the sintering trolley 710, the mixture of the distributor 700 will continue to flow, and the monitoring position of the infrared moisture detector 800 remains unchanged. The infrared moisture detector 700 will continuously monitor the mixture passing through the monitoring position, so the monitoring area Li cannot be further divided into areas in the length direction of the distributor 700 for monitoring and adjustment. The adjustment area Yi is not affected by this, but the mixture of the adjustment area Yi is in the mixing hopper, and it is not convenient to directly monitor the moisture content. It can be understood that the greater the water content, the more water vapor overflows. Step A22 uses this principle to indirectly reflect the moisture content of the mixture by monitoring the size of the water vapor smoke through the camera, thereby realizing the monitoring of the sub-processing area of ​​the adjustment area Yi.

[0105] When the infrared moisture detector 800 is continuously monitoring, it may detect that the humidity of a certain monitoring area Li fluctuates, and the difference between the monitored moisture content and the overall average moisture content W1 is sometimes greater than the third preset threshold value e3, and sometimes not greater than the third preset threshold value e3. At this time, it may be that one of the sub-processing areas in the adjustment area Yi meets the standard, while the other sub-processing area does not meet the standard. Therefore, when it is detected that the monitoring area Li does not meet the standard, the sub-processing area needs to be monitored and adjusted separately. Using the size of water vapor smoke as a reaction indicator of the moisture content of the mixture in the corresponding area can better monitor and identify. The measurement parameter of the water vapor smoke size is the image information entropy. The average water vapor smoke size is the average value of the image information entropy of each sub-processing area.

[0106] The calculation formula of image information entropy is:

[0107]

[0108] Where i is the average gray value, i∈[0,255]; Z i It is the ratio of the total number of pixels corresponding to the average gray value to the total number of pixels in the image.

[0109] Furthermore, there is a time lag between each humidity adjustment and the humidity change effect being detected in monitoring area Li. This means that there is a humidity adjustment time delay between the completion of humidity adjustment and the appearance and detection of the humidity adjustment effect. Therefore, when executing step A32, the process returns to step A2 only after the humidity adjustment time delay has elapsed. When executing step A23, the process returns to step A21 only after the humidity adjustment time delay has elapsed. Furthermore, the time it takes for water vapor to be ejected from the steam nozzle and emerge from the top of the mixing hopper is less than the humidity adjustment time delay. Therefore, the delay time is based on the humidity adjustment time delay, which can be determined through empirical calculation or a limited number of experiments.

[0110] Reference Figure 3 , obtain the mixture temperature data, determine whether the mixture temperature meets the temperature uniformity preset standard and the temperature integrity preset standard, if not, adjust the mixture temperature by adjusting the hot air steam coupling structure, so that the mixture temperature meets the temperature uniformity preset standard and the temperature integrity preset standard, which is specifically achieved through the following steps S1 and S2.

[0111] S1: Obtain the current temperature Ti of the mixture in each monitoring area Li on the distributor and determine whether the current temperature Ti of the mixture in each monitoring area Li meets the preset temperature uniformity standard. If the current temperature Ti of the mixture in one or more monitoring areas Li does not meet the preset temperature uniformity standard, the monitoring areas Li that do not meet the preset temperature uniformity standard are determined to be areas requiring temperature adjustment, and the third regulating valves 213 corresponding to the areas requiring temperature adjustment are adjusted until the current temperature Ti of the mixture in all monitoring areas Li meet the preset temperature uniformity standard. That is, if the current temperature T1 of the mixture in monitoring area L1 does not meet the preset temperature uniformity standard, monitoring area L1 is determined to be an area requiring temperature adjustment, and the third regulating valve 213 in the adjustment area Y1 corresponding to monitoring area L1 is adjusted.

[0112] S2, obtain the current temperature Ti of the mixture in each monitoring area Li, and determine whether the current temperature Ti of the mixture in all monitoring areas Li meets the preset temperature integrity standard; if not, adjust the first regulating valve 321 and the second regulating valve 311 at the same time until the current temperature Ti of the mixture in all monitoring areas Li meets the preset temperature integrity standard.

[0113] First, adjust the temperature uniformity. After the uniformity adjustment is completed, adjust the temperature as a whole. This will ensure that the temperature uniformity is not greatly affected when the temperature is adjusted as a whole, thereby reducing the number of adjustments and the adjustment efficiency.

[0114] In step S1, the third regulating valve 213 corresponding to the temperature zone to be adjusted is adjusted. The specific adjustment method may be:

[0115] If the temperature of the area requiring temperature adjustment is lower than the current overall average temperature K1, the third regulating valve 213 is adjusted upward. If the temperature of the area requiring temperature adjustment is higher than the current overall average temperature K1, the third regulating valve 213 is adjusted downward. Specifically, if a monitoring area Li is determined to require temperature adjustment, the corresponding third regulating valve 213 is adjusted accordingly, achieving targeted temperature adjustment and ensuring preheating temperature uniformity and process consistency. After adjusting the third regulating valve 213, a temperature adjustment delay t is required before returning to step S1 and re-evaluating the temperature uniformity against the preset standard. Only after passing the test will the process proceed to step S2.

[0116] The preset temperature uniformity standard is that the difference between the current mixture temperature Ti in each monitoring area Li and the current overall average temperature K1 is no greater than a fourth preset threshold value e4. The setting of the fourth preset threshold value e4 is related to the frequency of adjustment. To ensure infrequent adjustment, the fourth preset threshold value e4 is preferably 4-6°C. The current overall average temperature K1 is the average of the current mixture temperatures Ti in all monitoring areas Li.

[0117] Preferably, the preset temperature integrity standard is that the difference between the current overall average temperature K1 of all monitoring areas Li and the target temperature K is not greater than a second preset threshold value e2. In step S2, if the preset temperature integrity standard is not met, the first regulating valve 321 and the second regulating valve 311 are adjusted simultaneously, which is specifically achieved through steps S22, S23, S24, and S25 as follows:

[0118] S21, determine whether step A31 has been executed. If step A31 has not been executed, go to step S25; if step A31 has been executed, go to step S22; if step A31 has not been executed, it means: step A30 has been executed once, and when step A30 is executed, the current moisture content Si of the mixture in all monitoring areas Li meets the preset standard of humidity integrity, and step A31 is directly skipped to enter the subsequent step (step S1).

[0119] S22, determine the interval time T between the current time and the first execution of step A31 间 Is it less than the temperature adjustment time delay t?

[0120] If T 间 is less than t, and when step A31 is executed for the first time, the first regulating valve 321 is adjusted upward by G1, and then step S23 is entered;

[0121] If T 间 is less than t, and when step A31 is executed for the first time, the first regulating valve 321 adjusts G1 downward, then the process goes to step S24;

[0122] If T 间 If it is not less than t, then go to step S25;

[0123] After adjusting the first regulating valve 321 or the second regulating valve 311, it takes time for the mixture to be heated. After the mixture is heated, it takes a while to be transported to the monitoring area Li to be monitored. The temperature adjustment time delay t is the delay taking into account the above time.

[0124] The temperature adjustment time delay t is the time difference between adjusting the first regulating valve 321 or the second regulating valve 311 and the time when the mixed material reaches the corresponding temperature adjustment effect and is transported to the monitoring area Li for monitoring. Usually, if the humidity is adjusted by A31, if the temperature effect of the humidity adjustment is generated and can be monitored, that is, T 间 If T is not less than t, then humidity regulation will not interfere with subsequent temperature regulation. 间 If it is less than t, the influence of humidity adjustment on temperature needs to be considered during temperature adjustment, and the influence of humidity adjustment on temperature needs to be compensated to achieve the purpose of temperature adjustment and avoid untimely temperature monitoring due to the temperature adjustment time delay t, thereby affecting temperature adjustment.

[0125] in L is the vertical height from horizontal tube 211 to the monitoring position of infrared thermometer 801, v is the rotational speed of unloading roller 600, and t0 is the comprehensive delay time, which takes into account the time required for regulating valve operation, the temperature lag time of steam hot air heating, and the lag time for natural cooling of the mixture after overheating. It is generally 2 to 5 minutes. Of course, t can also be obtained through experimental methods.

[0126] The specific process of S23 is as follows:

[0127] Determine whether the current overall average temperature K1 is greater than the target temperature K;

[0128] If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve 321 is adjusted upward by G2 and the second regulating valve 311 is adjusted upward by H2; then after waiting for a time t, the process returns to S1;

[0129] If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold e2, the first regulating valve 321 is adjusted downward by G3 and the second regulating valve 311 is adjusted downward by H3; then after waiting for a time t, the process returns to S1.

[0130] The specific process of S24 is as follows:

[0131] Determine whether the current overall average temperature K1 is greater than the target temperature K;

[0132] If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve 321 is adjusted upward by G4 and the second regulating valve 311 is adjusted upward by H4; then after waiting for a time t, the process returns to S1;

[0133] If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold e2, the first regulating valve 321 is adjusted downward by G5 and the second regulating valve 311 is adjusted downward by H5; then after waiting for a time t, the process returns to S1.

[0134] In steps S23 and S24, due to the influence of humidity adjustment, the currently monitored temperature cannot reflect the discharge temperature of the humidity-adjusted mixture. Therefore, the influence of humidity adjustment must be taken into account before temperature adjustment is performed. This means that the influence of moisture adjustment must be compensated to offset the effect of humidity adjustment on temperature. Furthermore, in steps S23 and S24, temperature adjustment does not need to wait until humidity adjustment has taken effect and is monitored. Temperature monitoring and adjustment can be performed immediately after step A31 is executed, reducing adjustment time and improving adjustment efficiency. This is especially true when, during the first step S1, the current temperature Ti of the mixture in each monitoring area Li meets the preset temperature uniformity standard and the process proceeds directly to step S21. Temperature adjustment can be performed directly without waiting for the effect of humidity adjustment to take effect, significantly improving adjustment efficiency. And since the adjustment amplitude is large when A31 is executed for the first time and has a greater impact on the temperature, its impact on the temperature needs to be considered when adjusting the temperature. If A31 is executed for the second time or later, the adjustment amplitude of subsequent A31 is small and the impact on the temperature is small, so compensation is not required. After the temperature is adjusted, it will return to step S1 and the temperature will be monitored and adjusted again, which will not affect the final adjustment effect.

[0135] The specific process of S25 is as follows:

[0136] Determine whether the current overall average temperature K1 is greater than the target temperature K;

[0137] If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve 321 is adjusted upward by G6δ i , the second regulating valve 311 increases H6δ i Then after waiting for time t, return to S1, G6 and H6 are the theoretical adjustment amounts of the first regulating valve 321 and the second regulating valve 311 in step S25 respectively.

[0138] If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve 321 is adjusted downward by G6δ i , the second regulating valve 311 lowers H6δ i ; Then after waiting time t, return to S1.

[0139] Among them, G2, H2, G3, H3, G4, H4, G5, H5, G6, and H6 satisfy the following formula:

[0140] G2=μ(K-K1-K2)×a×b1;

[0141] H2=γ(K-K1-K2)×a2×b1;

[0142] G3=μ(K1+K2-K)×a×b1;

[0143] H3=γ(K1+K2-K)×a2×b1;

[0144] G4=μ(K-K1+K2)×a×b1;

[0145] H4=γ(K-K1+K2)×a2×b1;

[0146] G5=μ(K1-K2-K)×a×b1;

[0147] H5=γ(K1-K2-K)×a2×b1;

[0148] G6=μ|K-K1|×a×b1;

[0149] H6=γ|K-K1|×a2×b1;

[0150] Where a is the adjustment amount of the first regulating valve 321 corresponding to a unit temperature change, μ is the matching coefficient of the first regulating valve 321, a2 is the adjustment amount of the second regulating valve 311 corresponding to a unit temperature change, γ is the matching coefficient of the second regulating valve 311, and b1 is the primary temperature adjustment coefficient; δ i is the adjustment coefficient of the i-th execution of S21, where δ1=1, δ i >δ i+1 Usually, two adjustments are enough to complete the process, δ2 = 50% - 60%. By coarse adjustment and fine adjustment, precise adjustment can be achieved and the number of adjustments can be reduced.

[0151] When executing step S25, since step A31 has not been executed or the impact of step A31 on the temperature has been reflected and monitored, the impact of step A31 on the temperature adjustment does not need to be considered during adjustment.

[0152] K2 is the temperature of the mixture affected by the adjustment of the first regulating valve 321 to G1, and is a positive value. If G2, H2, G3, H3, G4, H4, G5, H5, G6, or H6 are negative values ​​according to the above calculation, the opposite operation can be performed. For example, if G5 is adjusted downward in the step itself, if G5 is negative, it means that the absolute value of G5 needs to be increased.

[0153] When the first regulating valve 321 and the second regulating valve 311 are adjusted simultaneously in steps S23, S24, and S25, a humidity stability relationship must be satisfied. The humidity stability relationship is:

[0154] q z ×ΔQ z ×ρ z ×w h =ΔQ r ×ρ r ×w r ;

[0155] q z , ΔQ z , ρ z 、w h , ΔQ r , ρ r 、w r They are respectively steam humidity, steam flow change, steam average density, mixed material water absorption rate, hot air flow change, hot air average density, and hot air water absorption rate. By satisfying the humidity stability relationship between hot air and hot steam, the impact on the moisture content of the mixed material during temperature adjustment is minimized, thereby achieving dual precise adjustment of temperature and humidity. That is, in steps S23, S24, and S25, when the first regulating valve 321 and the second regulating valve 311 are adjusted simultaneously, the steam flow change ΔQ caused by the adjustment of the first regulating valve 321 is z ΔQ caused by the regulation of the second regulating valve 311 r , satisfying the humidity stability relationship. If the hot air change corresponding to G2 is ΔQ z2 , the hot air change corresponding to H2 is ΔQ r2 ; then ΔQ z2 and ΔQ r2 satisfy:

[0156] q z ×ΔQ z2 ×ρ z ×w h =ΔQ r2 ×ρ r ×w r Ensure that the overall temperature is adjusted without significantly affecting the moisture content. The humidity stability relationship is derived from the humidity relationship of the heated mixture.

[0157] The humidity relationship of the mixture after heating is:

[0158] q2=(q z ×Q z ×ρ z ×w h +q0×v h -Q r ×ρ r ×w r )÷v h ×100%

[0159] q2 is the moisture content of the mixture after heating, Q z is the steam flow rate, q0 is the initial humidity of the mixture, v h is the mixing material feeding speed, Q r is the hot air flow.

[0160] Preferably, the first preset threshold e1 and the second preset threshold e2 are set to a value related to the adjustment frequency. To ensure infrequent adjustment, the first preset threshold e1 is a moisture content of 0.5% to 1%, and the second preset threshold e2 is 2 to 3°C.

[0161] The temperature t2 of the mixture after being heated by the hot air steam coupling structure satisfies the following relationship:

[0162] t2=[(t r -t0)×c r ×Q r ×ρ r +((t z -t0)×c z +2500)×Q z ×ρ z ]×k÷(v h ×c h )+t0;

[0163] t r ,t0,c r , Q r , ρ r , t z 、c z , Q z , ρ z , k, v h 、c h They are hot air temperature, initial temperature of mixture, average specific heat of hot air at constant pressure, hot air flow, average density of hot air, steam temperature, average specific heat of steam at constant pressure, steam flow, average density of steam, heat absorption rate of mixture, feeding speed of mixture, and average specific heat of mixture. According to the above formula, we can calculate the hot air flow Q when the temperature needs to be adjusted to the target temperature. r , steam flow Q z Adjust to what amount and obtain the adjustment amount of the corresponding control valve.

[0164] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for controlling the preheating of a sintering machine mixture by coupling steam and hot air, characterized in that: The steps include: Obtaining the mixture humidity data, judging whether the mixture moisture content meets the preset humidity uniformity standard and humidity integrity standard; if not, adjusting the mixture moisture content by adjusting the hot air steam coupling structure to make the mixture moisture content meet the preset humidity uniformity standard and humidity integrity standard; Obtaining mixture temperature data, determining whether the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard; if not, adjusting the mixture temperature by adjusting the hot air steam coupling structure to make the mixture temperature meet the preset temperature uniformity standard and the temperature integrity preset standard; The hot air and steam coupling structure is used to mix the hot air and hot steam and send them into the mixing hopper, and the flow ratio of the hot air and hot steam is adjustable; The hot air and steam coupling structure includes a mixer and a connecting pipe; the mixer is provided with a hot air inlet pipe and a steam inlet pipe; the connecting pipe is provided with a plurality of pipes and arranged along the circumference of the mixing hopper, one end of the connecting pipe is connected to the mixer, and the other end is connected to the mixing chamber; wherein the steam inlet pipe and the hot air inlet pipe are respectively installed with a first regulating valve and a second regulating valve; the connecting pipe is installed with a third regulating valve; the flow ratio of the hot air and the hot steam can be adjusted by adjusting the first regulating valve and the second regulating valve; The method further includes: dividing the distributor into i monitoring areas Li along the width direction of the distributor, and dividing one cross section of the mixing hopper into i adjustment areas Yi along the width direction of the mixing hopper, wherein the monitoring areas Li correspond to the adjustment areas Yi in a one-to-one manner, and i is a positive integer greater than 1; The method of obtaining the mixture humidity data and determining whether the moisture content of the mixture meets the preset humidity uniformity standard and the humidity integrity standard, and if not, adjusting the moisture content of the mixture by adjusting the hot air steam coupling structure so that the moisture content of the mixture meets the preset humidity uniformity standard and the humidity integrity standard, specifically includes: A1, the conditioning area Yi is divided into two sub-processing areas along the length direction of the mixing hopper; A2, obtaining the current moisture content Si of the mixture in each monitoring area Li on the distributor, and determining whether the current moisture content Si of the mixture in each monitoring area Li meets the preset standard for humidity uniformity; if the current moisture content Si of the mixture in one or more monitoring areas Li does not meet the preset standard for humidity uniformity, then the monitoring areas Li that do not meet the preset standard for humidity uniformity are determined as areas requiring humidity adjustment, moisture levels of the sub-processing areas corresponding to the areas requiring humidity adjustment are monitored, and the third regulating valves of the sub-processing areas corresponding to the areas requiring humidity adjustment are adjusted based on the monitoring data until the current moisture content Si of the mixture in all monitoring areas Li meet the preset standard for humidity uniformity; A3, determining whether the current moisture content Si of the mixed material in all monitoring areas Li meets the preset standard for humidity integrity; if not, adjusting the first regulating valve and / or the second regulating valve until the current moisture content Si of the mixed material in all monitoring areas Li meets the preset standard for humidity integrity; The method of obtaining the mixture temperature data and determining whether the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard, and if not, adjusting the mixture temperature by adjusting the hot air steam coupling structure so that the mixture temperature meets the preset temperature uniformity standard and the temperature integrity preset standard, specifically includes: S1, obtaining the current temperature Ti of the mixture in each monitoring area Li on the distributor, and determining whether the current temperature Ti of the mixture in each monitoring area Li meets the preset temperature uniformity standard; if the current temperature Ti of the mixture in one or more monitoring areas Li does not meet the preset temperature uniformity standard, the monitoring areas Li that do not meet the preset temperature uniformity standard are determined to be areas requiring temperature adjustment, and the third regulating valves corresponding to the areas requiring temperature adjustment are adjusted until the current temperature Ti of the mixture in all monitoring areas Li meet the preset temperature uniformity standard; S2, obtain the current temperature Ti of the mixture in each monitoring area Li, and determine whether the current temperature Ti of the mixture in all monitoring areas Li meets the preset temperature integrity standard; if not, adjust the first regulating valve and the second regulating valve at the same time until the current temperature Ti of the mixture in all monitoring areas Li meets the preset temperature integrity standard.

2. The sintering machine mixture steam and hot air coupled preheating control method according to claim 1, characterized in that: The preset standard for humidity integrity is that the difference between the overall average moisture content W1 of all monitoring areas Li and the target moisture content W is not greater than the first preset threshold value e1; If the above is not met, the first regulating valve and / or the second regulating valve are adjusted, specifically including: A31, if the overall average moisture content W1 is greater than the target moisture content W and the difference is greater than a first preset threshold value e1, the first regulating valve is adjusted downward and / or the second regulating valve is adjusted upward; if the overall average moisture content W1 is less than the target moisture content W and the difference is greater than the first preset threshold value e1, the first regulating valve is adjusted upward and / or the second regulating valve is adjusted downward; A32, return to step A2.

3. The sintering machine mixture steam and hot air coupled preheating control method according to claim 2, characterized in that: When step A31 is executed for the first time, the first regulating valve is adjusted, and the adjustment amount of the first regulating valve is , The opening adjustment amount of the first regulating valve corresponding to the unit moisture change, is the humidity adjustment coefficient; when step A31 is executed for the second time and thereafter, the second regulating valve is adjusted, and the adjustment amount of the second regulating valve is , is the opening adjustment amount of the second regulating valve corresponding to the unit moisture change, is the secondary humidity adjustment coefficient, and .

4. The sintering machine mixture steam and hot air coupled preheating control method according to claim 1, characterized in that: The temperature integrity preset standard is that the difference between the current overall average temperature K1 of all monitoring areas Li and the target temperature K is not greater than the second preset threshold value e2; If the above is not met, the first regulating valve and the second regulating valve are adjusted simultaneously, specifically including: S21, it is determined whether step A31 has been executed, if step A31 has not been executed, the process proceeds to step S25; if step A31 has been executed, the process proceeds to step S22; S22, determine the interval between the current time and the first execution of step A31 Is it less than the temperature adjustment time delay t? like is less than t, and when step A31 is executed for the first time, the first regulating valve is adjusted upward. , then proceed to step S23; like is less than t, and when step A31 is executed for the first time, the first regulating valve is lowered , then proceed to step S24; like Is not less than t, the process proceeds to step S25; S23, determining whether the current overall average temperature K1 is greater than the target temperature K; If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted upward. , the second regulating valve is adjusted upward ; Then after waiting for time t, return to S1; If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is lowered. , the second regulating valve is adjusted downward ; Then after waiting for time t, return to S1; S24, determining whether the current overall average temperature K1 is greater than the target temperature K; If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted upward. , the second regulating valve is adjusted upward ; Then after waiting for time t, return to S1; If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is lowered. , the second regulating valve is adjusted downward ; Then after waiting for time t, return to S1; S25, determining whether the current overall average temperature K1 is greater than the target temperature K; If the current overall average temperature K1 is lower than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is adjusted upward. , the second regulating valve is adjusted upward ; Then after waiting for time t, return to S1; If the current overall average temperature K1 is greater than the target temperature K and the difference is greater than the second preset threshold value e2, the first regulating valve is lowered. , the second regulating valve is adjusted downward ; Then after waiting for time t, return to S1; in 、 、 、 、 、 、 、 、 、 Satisfies the following formula: ； ； ； ； ； ； ； ； = ； ； in The adjustment amount of the first regulating valve corresponding to a unit temperature change, is the ratio coefficient of the first regulating valve, The adjustment amount of the second regulating valve corresponding to unit temperature change, is the ratio coefficient of the second regulating valve, is the primary temperature adjustment coefficient; The adjustment amount of the first regulating valve is The influence of temperature on the mixture; is the adjustment coefficient of the i-th execution of S21, where , .

5. The sintering machine mixture steam and hot air coupled preheating control method according to claim 4, characterized in that: When the first regulating valve and the second regulating valve are adjusted simultaneously in steps S23, S24, and S25, a humidity stability relationship must be satisfied; the humidity stability relationship is: ； 、 、 、 、 、 、 They are steam humidity, steam flow change, steam average density, mixture water absorption rate, hot air flow change, hot air average density, and hot air water absorption rate.

6. The sintering machine mixture steam and hot air coupled preheating control method according to claim 5, characterized in that: The first preset threshold e1 is a moisture content of 0.5% to 1%, and the second preset threshold e2 is 2 to 3°C.

7. The sintering machine mixture steam and hot air coupled preheating control method according to claim 1 or 2, characterized in that: The temperature of the mixture after being heated by the hot air steam coupling structure Satisfies the following relationship: ； 、 、 、 、 、 、 、 、 、 、 、 They are hot air temperature, initial temperature of mixture, average specific heat of hot air at constant pressure, hot air flow, average density of hot air, steam temperature, average specific heat of steam at constant pressure, steam flow, average density of steam, heat absorption rate of mixture, feeding speed of mixture, and average specific heat of mixture.

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