Method, device, equipment, storage medium and program product for improving sintering waste heat utilization rate

Abstract

The application provides a method, device, equipment, storage medium and program product for improving sintering residual heat utilization rate. The current production state information of a sintering machine is acquired, and the sintering endpoint position is acquired according to the current production state information. It is judged whether the sintering endpoint position is in a normal production interval. When the sintering endpoint position is in the normal production interval, the current air bellow corresponding to the sintering endpoint position is determined, and the valve opening degree of the air bellow after the current air bellow is adjusted downward to reduce the flue gas temperature in the sintering large flue. The application tracks the sintering endpoint position, adjusts the valve opening degree of the corresponding air bellow, and reduces the air flow on the sintering car after the sintering endpoint. The requirements of sintering production are met, and more heat is retained in the sintering ore and brought into the ring cooler. The application realizes more efficient residual heat utilization in the sintering process, improves the sintering residual heat utilization rate, and can reduce production fluctuations as much as possible. Compared with the setting of the residual heat boiler in the large flue, the service life is improved.

Description

Technical Field

[0001] This invention relates to the field of sintering technology, and in particular to a method, apparatus, equipment, storage medium, and program product for improving the utilization rate of sintering waste heat. Background Technology

[0002] With the rapid development of modern industry, steel production is becoming increasingly large-scale, and energy consumption is also increasing. Energy conservation and environmental protection indicators are becoming increasingly important factors to consider in the steel production process. In steel production, iron-containing raw materials need to be processed through a sintering system before entering the blast furnace for smelting. This involves mixing various powdered iron-containing raw materials with appropriate amounts of fuel (pulverized coal, coke powder) and flux, adding an appropriate amount of water, mixing and pelletizing them, and then placing them on a sintering trolley for roasting. This causes a series of physicochemical changes, forming easily smelted sintered ore. This process is called sintering.

[0003] During the sintering process, the ignited combustion belt moves from top to bottom at the vertical sintering speed. The sintering trolley moves from the head to the tail of the sintering machine. When the combustion belt reaches the bottom of the mixture on the sintering trolley, the position of the sintering trolley relative to the head of the sintering machine is the sintering endpoint, which is usually indicated by the wind box number. The sintering endpoint position can usually be detected by detecting the temperature of the sintering flue gas in the sintering wind box.

[0004] However, in existing technologies, the valve opening of the bellows remains essentially unchanged after the sintering endpoint. The heat accumulated in the sinter itself after the sintering endpoint is carried out of the sintering flue by the bellows, resulting in significant heat loss. Existing waste heat utilization technologies include installing waste heat boilers in the sintering flue; however, the flue gas in the sintering flue is not dust-removed, carrying a high amount of dust, resulting in a harsh working environment for the boiler and a short service life. Therefore, this approach has low practicality.

[0005] In view of this, it is necessary to propose a method, apparatus, equipment, storage medium and process product to improve the utilization rate of sintering waste heat in order to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0006] The main objective of this invention is to provide a method, apparatus, equipment, storage medium, and program product for improving the utilization rate of sintering waste heat, so as to solve the technical problems of how to improve the utilization rate of sintering waste heat and extend its service life.

[0007] To achieve the above objectives, the present invention provides a method for improving the utilization rate of sintering waste heat, comprising the following steps:

[0008] S1, Obtain the current production status information of the sintering machine, and obtain the sintering endpoint position based on the current production status information;

[0009] S2, determine whether the sintering endpoint is within the normal production range; wherein, the normal production range is the range between the end of the second-to-last wind box and the beginning of the fourth-to-last wind box;

[0010] S3, when the sintering endpoint is within the normal production range, determine the current air box corresponding to the sintering endpoint and lower the valve opening of the air box after the current air box to reduce the flue gas temperature in the sintering flue.

[0011] Preferably, step S3 specifically includes the following steps:

[0012] When the current air box corresponding to the sintering endpoint position is the second to last air box, the valve controlling the second to last air box is reduced by a first change from the current valve opening.

[0013] Determine whether the current valve opening after adjustment is less than or equal to the first preset opening;

[0014] When the adjusted current valve opening is less than or equal to the first preset opening, it is determined that the valve opening adjustment of the last air box has ended, and production continues in the current production state.

[0015] When the adjusted current valve opening is greater than the first preset opening, the current valve opening of the last air box is kept unchanged and maintained for the first preset time. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the first preset time.

[0016] Determine whether the outlet flue gas temperature is less than or equal to the first preset temperature;

[0017] When the outlet flue gas temperature is less than or equal to the first preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state.

[0018] When the outlet flue gas temperature is greater than the first preset temperature, return to the step of reducing the valve of the penultimate air box from the current valve opening by a first change amount.

[0019] Preferably, step S3 specifically includes the following steps:

[0020] When the current air box corresponding to the sintering endpoint is the third to last air box or the fourth to last air box, first lower the valve opening of the first to last air box, and then lower the valve opening of the second to last air box to reduce the flue gas temperature in the sintering flue.

[0021] Preferably, the step of first lowering the valve opening of the penultimate bellows specifically includes the following steps:

[0022] First, control the valve of the last bellows to decrease by the second change amount from the current valve opening;

[0023] When the current valve opening after adjustment is less than or equal to the second preset opening, it is determined that the valve opening adjustment of the penultimate air box is completed, and then the valve opening of the penultimate air box is adjusted down.

[0024] When the adjusted current valve opening is greater than the second preset opening, the current valve opening of the last air box is kept unchanged and maintained for the second preset duration. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the second preset duration.

[0025] Determine whether the outlet flue gas temperature is less than or equal to the second preset temperature;

[0026] When the outlet flue gas temperature is less than or equal to the second preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state.

[0027] When the outlet flue gas temperature is greater than the second preset temperature, return to the step of adjusting the valve of the penultimate air box down by a second change from the current valve opening.

[0028] Preferably, the step of further reducing the valve opening of the penultimate bellows specifically includes the following steps:

[0029] When the current valve opening of the penultimate bellows is less than or equal to the second preset opening, the valve of the penultimate bellows is controlled to be adjusted down by a third change from the current valve opening.

[0030] Determine whether the valve opening of the second air box after adjustment is less than or equal to the third preset opening;

[0031] When the valve opening of the second air box is less than or equal to the third preset opening, it is determined that the valve opening adjustment of the penultimate air box is completed, and production continues in the current production state.

[0032] Preferably, after determining whether the valve opening of the second bellows is less than or equal to the third preset opening, the step further includes the following steps:

[0033] When the valve opening of the second wind box is greater than the third preset opening, the current valve opening of the penultimate wind box is kept unchanged and maintained for the third preset time. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the third preset time.

[0034] Determine whether the outlet flue gas temperature is less than or equal to a third preset temperature;

[0035] When the outlet flue gas temperature is less than or equal to the third preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state.

[0036] When the outlet flue gas temperature is greater than the third preset temperature, return to the step of continuing to control the valve of the penultimate air box to decrease the third change amount from the current valve opening.

[0037] The present invention also provides an apparatus for improving the utilization rate of sintering waste heat, comprising:

[0038] The acquisition unit is used to acquire the current production status information of the sintering machine and acquire the sintering endpoint position based on the current production status information.

[0039] The judgment unit is used to determine whether the sintering endpoint position is within the normal production range; wherein, the normal production range is the range between the end of the second-to-last wind box and the beginning of the fourth-to-last wind box;

[0040] The regulating unit is used to determine the current air box corresponding to the sintering endpoint position when the sintering endpoint position is within the normal production range, and to lower the valve opening of the air box after the current air box in order to reduce the flue gas temperature in the sintering flue.

[0041] The present invention also provides an apparatus for improving the utilization rate of sintering waste heat, including a memory, a processor, and a program for improving the utilization rate of sintering waste heat stored in the memory and executable on the processor. When the processor executes the program for improving the utilization rate of sintering waste heat, it implements the steps of the method for improving the utilization rate of sintering waste heat as described above.

[0042] The present invention also provides a storage medium storing a program for improving the utilization rate of sintering waste heat, wherein when the program for improving the utilization rate of sintering waste heat is executed by a processor, the steps of the method for improving the utilization rate of sintering waste heat as described above are implemented.

[0043] The present invention also provides a program product, the program product including a program for improving the utilization rate of sintering waste heat, wherein when the program for improving the utilization rate of sintering waste heat is executed by a processor, it implements the steps of the method for improving the utilization rate of sintering waste heat as described above.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] This invention provides a method, apparatus, equipment, storage medium, and program product for improving the utilization rate of sintering waste heat. By acquiring the current production status information of the sintering machine and determining the sintering endpoint position based on this information, the invention determines whether the endpoint position is within the normal production range. If the endpoint position is within the normal production range, the invention identifies the current air box corresponding to the endpoint position and lowers the valve opening of the air boxes following the current air box to reduce the flue gas temperature in the sintering flue. This application, by tracking the sintering endpoint position and adjusting the corresponding air box valve opening, reduces the airflow on the sintering trolley after the endpoint, satisfying the requirements of sintering production while retaining more heat within the sintered ore and carrying it into the annular cooler. This achieves more efficient waste heat utilization during the sintering process, improving the sintering waste heat utilization rate. Furthermore, this application can minimize production fluctuations and extends the service life compared to setting up a waste heat boiler in the large flue. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0047] Figure 1 This is a process flow diagram of a sintering system in the existing technology;

[0048] Figure 2 This is a schematic diagram of sinter formation in existing technology;

[0049] Figure 3 This is a schematic diagram illustrating the working principle of an annular cooler in existing technology.

[0050] Figure 4 This is a schematic diagram of the waste heat recovery device of an existing ring cooler.

[0051] Figure 5 This is a schematic diagram of the tail section of a sintering machine in the prior art;

[0052] Figure 6 This is a schematic diagram of the fitting curves of typical flue gas flow rate and temperature for each air box in a sintering machine in the prior art;

[0053] Figure 7 This is a schematic diagram showing the measured flue gas temperature of each air box branch pipe in a sintering machine in the prior art.

[0054] Figure 8 This is a schematic diagram illustrating an application scenario of a device for improving the utilization rate of sintering waste heat in one embodiment of the present invention.

[0055] Figure 9 This is a schematic flowchart of one embodiment of the present invention.

[0056] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0057] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0060] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0061] Those skilled in the art should know that with the rapid development of modern industry, the scale of steel production is increasing, and energy consumption is also increasing. Energy conservation and environmental protection indicators are becoming increasingly important factors to consider in the steel production process. In steel production, iron-containing raw materials need to be processed by a sintering system before entering the blast furnace for smelting. That is, various powdered iron-containing raw materials are mixed with appropriate amounts of fuel (coal powder, coke powder) and flux, and an appropriate amount of water is added. After mixing and pelletizing, they are placed on a sintering trolley for roasting, causing a series of physicochemical changes to form easily smelted sinter. This process is called sintering.

[0062] The sintering system mainly includes several pieces of equipment such as a sintering trolley, a mixer, a main exhaust fan, and an annular cooler. See the sintering system process flow diagram. Figure 1As shown: Various raw materials are proportioned in the batching room to form a mixture. This mixture is then fed into a mixer for homogenization and pelletizing. It is then evenly distributed onto the sintering trolley by a roller feeder and a nine-roller distributor to form a sintering mixture layer. The ignition fan and ignition blower start the ignition furnace, igniting the uppermost layer of the sintering mixture on the sintering trolley. The ignited combustion zone moves downwards, and the mixture passing through it is roasted into sintered ore. This is the sintering process. After sintering, the resulting sintered ore is crushed by a single-roller crusher and cooled by an annular cooler. Finally, it is screened and granulated before being sent to the blast furnace or finished ore bin. The oxygen required for the sintering process is provided by the main exhaust fan. Multiple vertically arranged bellows are located below the sintering trolley, and below the bellows is a horizontally placed large flue (or duct). The large flue is connected to the main exhaust fan, which generates negative pressure air through the large flue and bellows, providing combustion air for the sintering process.

[0063] Please refer to Figure 2 As shown, during the sintering process, the ignited combustion zone moves from top to bottom, and its movement speed is the vertical sintering speed. The sintering trolley moves from the head to the tail of the sintering machine, and its speed is the machine speed. When the combustion zone reaches the bottom of the mixture on the sintering trolley, the position of the sintering trolley relative to the head of the sintering machine marks the sintering endpoint. A schematic diagram of sinter formation is shown below. Figure 2 As shown:

[0064] like Figure 2 As shown, as the sintering trolley moves, the combustion zone gradually moves downward. The mixture passing through the combustion zone is roasted into sintered ore. During the sintering process, the material in the sintering trolley can be divided into the bottom material layer, the original material zone, the wet zone, the drying and preheating zone, the combustion zone, and the sintered ore zone from bottom to top. When the combustion zone moves to the bottom material layer, all the material in the sintering trolley has been roasted into sintered ore. The corresponding position at this time is the sintering endpoint position, which is generally indicated by the bellows number.

[0065] During the sintering process, the temperature of the combustion zone is ~1250℃. The heat generated by fuel combustion continuously accumulates in the mixed material layer below the sintering endpoint. The heat generated by fuel combustion heats the air passing through the sintering machine material layer (i.e., sintering flue gas). Before reaching the sintering endpoint, the flue gas temperature continues to rise. After the sintering endpoint, since there is no fuel available for continued combustion, the air passing through the sintering material layer is a cooling process. At this time, the sintering flue gas temperature begins to drop. Therefore, the sintering endpoint position can be detected by detecting the sintering flue gas temperature in the sintering air box.

[0066] In existing sintering production processes, the sintering endpoint is controlled between the penultimate and fourth-to-last air boxes. Figure 5As shown: Air passes through the sintering material surface, providing oxygen to the fuel in the mixture, forming a continuously and stably descending combustion zone. At the penultimate wind box, the end of the sintering combustion zone reaches the bottom material layer, and the corresponding position is the sintering endpoint.

[0067] like Figure 5 As shown, during the sintering process, a large amount of air passes through the sintering material layer, providing oxygen for the sintering combustion process, transferring heat from the combustion zone downwards, and simultaneously cooling the already formed sintered ore. The process is as follows: Driven by the main sintering exhaust fan, a large amount of air first cools the already formed sintered ore, reaching the combustion zone to provide oxygen for the continuous combustion. It also carries heat from the combustion zone into the mixture below the combustion zone, causing the combustion zone to gradually move downwards. The air, heated after passing through the combustion zone, heats the mixture below and then passes through the bottom layer, forming sintering flue gas. The sintering flue gas carries dust and pollutants generated after combustion. After entering the air box and the main flue, the sintering flue gas is discharged through flue gas treatment facilities (dust removal, desulfurization, and denitrification facilities). The typical flue gas flow rate and temperature fitting curves for each air box in the existing sintering machine are shown below. Figure 6 As shown:

[0068] like Figure 6 As shown, at approximately 2 / 3 of the sintering machine's length, the sintering flue gas temperature exceeds 100℃. At this point, the liquid water in the mixture layer below the corresponding sintering combustion zone disappears, increasing sintering permeability and significantly increasing the flue gas flow rate in the subsequent air boxes. Table 1 shows the actual flue gas flow rates of each air box measured on-site at a certain sintering machine.

[0069] Table 1: Measured flue gas flow rates of various air boxes in a sintering machine

[0070]

[0071] In the existing technology, the flue gas temperature of each air box branch pipe of a sintering machine measured on-site is as follows: Figure 7 As shown:

[0072] Obviously, the heat generated during sintering is produced by the combustion of fuel added to the sintering batch. Under the existing sintering process, most of the heat generated during combustion is carried away by the sintering flue gas, and a small portion is carried by the sintered ore into the annular cooler. The existing sintering process meets the requirements of sintering production. As can be seen from Table 1, the average flue gas volume of sintering wind boxes 1 to 24 is approximately 20,000 Nm³. 3 / h, flue gas temperature below 300℃; the average flue gas volume of the 25th to 28th wind boxes in the last section of the sintering machine is 77000 Nm³. 3 / h, the flue gas temperature exceeds 350℃, meaning the enthalpy value of the flue gas in the tail section is high, and the tail section flue gas carries a large amount of heat from the sinter into the main flue for external discharge. For example Figure 7As shown, at the No. 21 wind box location, both the sintering flue gas volume and air volume increase sharply, indicating that the No. 21 wind box location is where the excessive moisture zone disappears. During the sintering process, the sintered ore contains liquid water. As the sintering process progresses, the heat generated by the combustion zone is carried into the material below, where heat continuously accumulates. When the temperature of the material below exceeds the dew point temperature, no liquid water remains, and the permeability of the material increases sharply. This is reflected in the flue gas flow rate, which increases sharply, and the flue gas temperature is higher than the dew point temperature (the dew point temperature under standard atmospheric pressure is 100℃; in production, to ensure the normal operation of subsequent dust removal, desulfurization, and other processes, the flue gas temperature at the outlet of the main flue needs to be controlled between 120℃ and 180℃). Existing sintering waste heat utilization technologies include arranging waste heat boilers in the sintering main flue. However, the flue gas in the main flue is not dust-removed, carries a high amount of dust, and the boiler operates in a harsh environment with a short service life.

[0073] In addition, after the sinter is formed, it slides down the tail of the sintering machine, is crushed by a single-roll crusher, and then cooled in a cooling device (commonly an annular cooler or a belt cooler, the cooling mechanism is the same, and the following text uses an annular cooler as an example). The average temperature of the sinter entering the annular cooler is about 700℃. After being cooled to about 150℃ by the annular cooler, it enters the finished product granulation process. The working principle diagram of the annular cooler is shown below. Figure 3 As shown:

[0074] like Figure 3 As shown, after the sinter is cooled, the conveyor belt of the subsequent finished product system can transport the sinter normally. Obviously, under the premise of simply meeting the sintering process requirements, when the average temperature of the sinter entering the annular cooler is low, the cooling air volume required for the cooling process is small, which can reduce the energy consumption of the cooling process. However, the sinter carries a large amount of heat, which is directly released into the atmosphere, resulting in both heat waste and environmental pollution. Therefore, modern sintering systems are equipped with waste heat recovery devices in the cooling process. A schematic diagram of a typical existing annular cooler waste heat recovery device is shown below. Figure 4 As shown:

[0075] like Figure 4 As shown, the high-temperature flue gas at the head of the annular cooler is sent to the heat exchanger to heat water and generate steam, which can be used to drive equipment or generate electricity.

[0076] Obviously, after the waste heat utilization device is installed in the annular cooler, the more heat the sinter entering the annular cooler carries, the larger the heat source of the waste heat utilization device will be. For the sintering system, the less the system's unorganized heat dissipation, the better the waste heat utilization efficiency. Therefore, the starting point of this application is to enable the sinter to carry more heat into the annular cooler as much as possible in order to improve the sintering waste heat utilization rate.

[0077] Please see the appendix Figures 8 to 9 An embodiment of the present invention provides a method for improving the utilization rate of sintering waste heat, comprising the following steps:

[0078] S1. Obtain the current production status information of the sintering machine and determine the sintering endpoint position based on the current production status information. For example, the sintering flue gas temperature data in the sintering machine's air box can be obtained. Those skilled in the art know that during sintering, the temperature of the combustion zone is ~1250℃. The heat generated by fuel combustion continuously accumulates in the mixed material layer below the sintering endpoint. The heat generated by fuel combustion heats the air passing through the sintering machine's material layer (i.e., the sintering flue gas). Before reaching the sintering endpoint, the flue gas temperature continuously rises. After the sintering endpoint, because there is no fuel available for continued combustion, the air passing through the sintering material layer is a cooling process, and the sintering flue gas temperature begins to decrease. Therefore, the sintering endpoint position can be detected by detecting the sintering flue gas temperature in the sintering air box. Figure 6 The inflection point of the flue gas temperature curve can be taken as the location corresponding to the sintering endpoint. In other embodiments, those skilled in the art can also obtain the sintering endpoint location through other known technical means.

[0079] S2, determine whether the sintering endpoint is within the normal production range; wherein, the normal production range is the range between the end of the second-to-last wind box and the beginning of the fourth-to-last wind box;

[0080] It is worth noting that if the sintering endpoint is too early, it indicates overburning, meaning the sintering machine's production capacity (e.g., the sintering area corresponding to the subsequent blowers starting from the combustion endpoint) is not fully utilized, resulting in a decrease in sinter output / capacity. Conversely, if the sintering endpoint is too late, it means the mixture on the sintering trolley has already reached the tail end for unloading before it has been fully burned. At this point, there is still a significant amount of raw material between the combustion zone and the bottom layer, leading to underburning and ultimately affecting the quality of the sinter. Based on extensive production experience and practical engineering cases, controlling the sintering endpoint between the penultimate and fourth-to-last blowers is the optimal sintering range. Therefore, this application defines the normal production range as the area between the end of the penultimate blower and the beginning of the fourth-to-last blower.

[0081] S3, when the sintering endpoint is within the normal production range, determine the current air box corresponding to the sintering endpoint and lower the valve opening of the air box after the current air box to reduce the flue gas temperature in the sintering flue.

[0082] In this application, when the sintering endpoint is within the normal production range, the current air box corresponding to the sintering endpoint is determined, for example, by means of... Figure 6The inflection point of the flue gas temperature curve determines the sintering endpoint. Hot thermocouples can be installed in the wind box to obtain the flue gas temperature. By fitting the temperatures obtained from the hot thermocouples of multiple wind boxes, the flue gas temperature curve can be obtained. In addition, the heat source of existing sintering waste heat utilization devices comes from the heat carried by the hot ore at the tail of the machine. This application tracks the sintering endpoint position and adjusts the opening of the corresponding wind box valve to reduce the air flow on the sintering trolley after the sintering endpoint. This not only meets the requirements of sintering production, but also allows more heat to be retained in the sinter and carried into the annular cooler, achieving more efficient waste heat utilization in the sintering process and improving the sintering waste heat utilization rate. Furthermore, this application can minimize production fluctuations and improve service life compared to setting up a waste heat boiler in a large flue.

[0083] Furthermore, if the sintering endpoint is not within the normal production range, for example, if it is at the position corresponding to the fifth-to-last wind box, then the sintering is severely overburned and is judged as an abnormal production state. In this case, the sintering endpoint can be adjusted to the normal production range using existing technology, and then the solution of this application can be adopted to improve the utilization rate of sintering waste heat.

[0084] In a preferred embodiment, step S3 specifically includes the following steps:

[0085] When the current air box corresponding to the sintering endpoint is the second to last air box, the valve of the last air box is reduced by a first change from the current valve opening. Preferably, at the start of sintering production, the valve opening of the last air box to the third to last air box can be controlled at 100%, and the first change for each reduction is set to 5% of the full opening.

[0086] Determine whether the current valve opening after adjustment is less than or equal to the first preset opening;

[0087] It is worth noting that, since the sintering mixture cannot be completely and evenly distributed on the sintering trolley, there will be some residual mixture clumps after the sintering endpoint and the sintering process will continue. Preferably, the first preset opening is set to 10% of full opening.

[0088] When the adjusted current valve opening is less than or equal to the first preset opening, it is determined that the valve opening adjustment of the last air box is completed, and production continues in the current state. At this time, the valve opening adjustment of the last air box is completed, and production can continue in the current state. This application can re-acquire the current production state information of the sintering machine according to the preset time interval. At the beginning of each time interval, the method of this application is re-executed. The preset time interval can be set by those skilled in the art according to actual needs.

[0089] When the adjusted current valve opening is greater than the first preset opening, the current valve opening of the last air box is kept unchanged and maintained for the first preset time. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the first preset time.

[0090] It is worth noting that the sintering flue, sintering trolley and sintered ore layer, main exhaust fan, main exhaust damper, air box branch pipes, air box valves, dust collector, and chimney together form a pipeline system. During stable sintering production, the pipeline system is in a balanced state. In this balanced state, the pipeline system provides the negative pressure and airflow values ​​for the air passing through the sintering material layer to meet the requirements of sintering production. However, once sintering enters a stable production phase, it remains in a stable state for an extended period, potentially lasting for several months. Therefore, in actual sintering production, the adjustment of pipeline system balance parameters is handled with caution. Thus, in this embodiment, after making small adjustments to the relevant parameters, a longer waiting period is adopted, such as a first preset time preferably 300-600 seconds, to confirm that the pipeline system maintains balance or achieves re-balance before proceeding to the next adjustment.

[0091] Determine whether the outlet flue gas temperature is less than or equal to the first preset temperature. In order to ensure the normal production of subsequent dust removal, desulfurization and other processes, the outlet flue gas temperature of the main flue needs to be controlled between 120°C and 180°C. As a preferred example, the first preset temperature is set to 120°C to reduce the flue gas temperature in the sintering main flue as much as possible and reduce the heat dissipation.

[0092] When the outlet flue gas temperature is less than or equal to the first preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state.

[0093] When the outlet flue gas temperature is higher than the first preset temperature, the process returns to the step of reducing the valve opening of the last-to-last air box by a first change. That is, if the flue gas temperature is still relatively high, it can be further reduced. The process returns to the step of reducing the valve opening of the last-to-last air box by a first change, and the valve opening of the last-to-last air box is reduced again.

[0094] Furthermore, after each adjustment, the sintering production status can be reassessed. If it is abnormal, the adjustment is stopped and the opening is returned to the stable state.

[0095] This application uses the adjustment of the air box valve after the sintering endpoint. This will not affect the sintering endpoint position under the current balanced state of the pipeline system. However, after adjusting the valve opening, the air intake at the corresponding valve position is reduced, which will affect the pipeline system. Therefore, this application embodiment adopts a small-amplitude, slow adjustment method for valve opening adjustment to ensure that the sintering system is stable before proceeding to the next adjustment.

[0096] In another preferred embodiment, step S3 specifically includes the following steps:

[0097] When the current air box corresponding to the sintering endpoint is the third to last air box or the fourth to last air box, first lower the valve opening of the first to last air box, and then lower the valve opening of the second to last air box to reduce the flue gas temperature in the sintering flue.

[0098] In a preferred embodiment, the step of first lowering the valve opening of the penultimate bellows specifically includes the following steps:

[0099] First, control the valve of the last bellows to decrease by a second amount from the current valve opening; preferably, the second amount is set to 5% of the fully open position.

[0100] When the adjusted current valve opening is less than or equal to the second preset opening, it is determined that the valve opening adjustment of the last air box is completed, and production continues in the current production state.

[0101] It is worth noting that, since the sintering mixture cannot be completely and evenly distributed on the sintering trolley, there will be some residual mixture clumps after the sintering endpoint and they will continue to sinter. Preferably, the second preset opening is set to 10% of full opening.

[0102] When the current valve opening after adjustment is greater than the second preset opening, the current valve opening of the penultimate wind box is kept unchanged and maintained for the second preset duration. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the second preset duration. Preferably, the second preset duration is set to 300-600s.

[0103] Determine whether the outlet flue gas temperature is less than or equal to the second preset temperature;

[0104] When the outlet flue gas temperature is less than or equal to the second preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state; preferably, the second preset temperature is set to 120°C.

[0105] When the outlet flue gas temperature is greater than the second preset temperature, return to the step of adjusting the valve of the penultimate air box down by a second change from the current valve opening.

[0106] In a preferred embodiment, the step of further reducing the valve opening of the penultimate air box specifically includes the following steps:

[0107] When the current valve opening of the second-to-last bellows is less than or equal to the second preset opening, the valve of the second-to-last bellows is further reduced by a third change from the current valve opening; preferably, the second change is set to 5% of the fully open position.

[0108] Determine whether the valve opening of the second air box after adjustment is less than or equal to the third preset opening;

[0109] It is worth noting that, since the sintering mixture cannot be completely and evenly distributed on the sintering trolley, there will be some residual mixture clumps after the sintering endpoint and the sintering process will continue. Preferably, the third preset opening is set to 10% of full opening.

[0110] When the valve opening of the second air box is less than or equal to the third preset opening, it is determined that the valve opening adjustment of the penultimate air box is completed, and production continues in the current production state.

[0111] Furthermore, after determining whether the valve opening of the second bellows is less than or equal to the third preset opening, the step further includes the following steps:

[0112] When the valve opening of the second wind box is greater than the third preset opening, the current valve opening of the penultimate wind box is kept unchanged and maintained for the third preset time. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the third preset time.

[0113] Determine whether the outlet flue gas temperature is less than or equal to a third preset temperature; preferably, the third preset temperature is set to 120°C.

[0114] When the outlet flue gas temperature is less than or equal to the third preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state.

[0115] When the outlet flue gas temperature exceeds the third preset temperature, the process returns to the step of further reducing the valve opening of the second-to-last air box by a third amount. That is, if the flue gas temperature is still relatively high and can be further reduced, the process returns to the step of further reducing the valve opening of the second-to-last air box by a third amount, thus reducing the valve opening of the second-to-last air box once more.

[0116] The present invention also provides an apparatus for improving the utilization rate of sintering waste heat, comprising:

[0117] The acquisition unit is used to acquire the current production status information of the sintering machine and acquire the sintering endpoint position based on the current production status information.

[0118] The judgment unit is used to determine whether the sintering endpoint position is within the normal production range; wherein, the normal production range is the range between the end of the second-to-last wind box and the beginning of the fourth-to-last wind box;

[0119] The regulating unit is used to determine the current air box corresponding to the sintering endpoint position when the sintering endpoint position is within the normal production range, and to lower the valve opening of the air box after the current air box in order to reduce the flue gas temperature in the sintering flue.

[0120] The present invention also provides an apparatus for improving the utilization rate of sintering waste heat, including a memory, a processor, and a program for improving the utilization rate of sintering waste heat stored in the memory and executable on the processor. When the processor executes the program for improving the utilization rate of sintering waste heat, it implements the steps of the method for improving the utilization rate of sintering waste heat as described above.

[0121] The present invention also provides a storage medium storing a program for improving the utilization rate of sintering waste heat, wherein when the program for improving the utilization rate of sintering waste heat is executed by a processor, the steps of the method for improving the utilization rate of sintering waste heat as described above are implemented.

[0122] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0123] The aforementioned computer-readable storage medium may be included in the equipment for improving the utilization rate of sintering waste heat; or it may exist independently and not be assembled into the equipment for improving the utilization rate of sintering waste heat.

[0124] The present invention also provides a program product, the program product including a program for improving the utilization rate of sintering waste heat, wherein when the program for improving the utilization rate of sintering waste heat is executed by a processor, it implements the steps of the method for improving the utilization rate of sintering waste heat as described above.

[0125] The specific implementation of the computer program product of the present invention is basically the same as the embodiments of the above-described method for improving the utilization rate of sintering waste heat, and will not be repeated here.

[0126] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for improving the utilization rate of sintering waste heat, characterized in that, Includes the following steps: S1, Obtain the current production status information of the sintering machine, and obtain the sintering endpoint position based on the current production status information; S2, determine whether the sintering endpoint is within the normal production range; wherein, the normal production range is the range between the end of the second-to-last wind box and the beginning of the fourth-to-last wind box; S3, when the sintering endpoint is within the normal production range, determine the current air box corresponding to the sintering endpoint and lower the valve opening of the air box after the current air box to reduce the flue gas temperature in the sintering flue.

2. The method for improving the utilization rate of sintering waste heat according to claim 1, characterized in that, Step S3 specifically includes the following steps: When the current air box corresponding to the sintering endpoint position is the second to last air box, the valve controlling the second to last air box is reduced by a first change from the current valve opening. Determine whether the current valve opening after adjustment is less than or equal to the first preset opening; When the adjusted current valve opening is less than or equal to the first preset opening, it is determined that the valve opening adjustment of the last air box has ended, and production continues in the current production state. When the adjusted current valve opening is greater than the first preset opening, the current valve opening of the last air box is kept unchanged and maintained for the first preset time. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the first preset time. Determine whether the outlet flue gas temperature is less than or equal to the first preset temperature; When the outlet flue gas temperature is less than or equal to the first preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state. When the outlet flue gas temperature is greater than the first preset temperature, return to the step of reducing the valve of the penultimate air box from the current valve opening by a first change amount.

3. The method for improving the utilization rate of sintering waste heat according to claim 1, characterized in that, Step S3 specifically includes the following steps: When the current air box corresponding to the sintering endpoint is the third to last air box or the fourth to last air box, first lower the valve opening of the first to last air box, and then lower the valve opening of the second to last air box to reduce the flue gas temperature in the sintering flue.

4. The method for improving the utilization rate of sintering waste heat according to claim 3, characterized in that, The first step is to lower the valve opening of the last bellows box, specifically including the following steps: First, control the valve of the last bellows to decrease by the second change amount from the current valve opening; When the current valve opening after adjustment is less than or equal to the second preset opening, it is determined that the valve opening adjustment of the penultimate air box is completed, and then the valve opening of the penultimate air box is adjusted down. When the adjusted current valve opening is greater than the second preset opening, the current valve opening of the last air box is kept unchanged and maintained for the second preset duration. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the second preset duration. Determine whether the outlet flue gas temperature is less than or equal to the second preset temperature; When the outlet flue gas temperature is less than or equal to the second preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state. When the outlet flue gas temperature is greater than the second preset temperature, return to the step of adjusting the valve of the penultimate air box down by a second change from the current valve opening.

5. The method for improving the utilization rate of sintering waste heat according to claim 4, characterized in that, The next step, adjusting the valve opening of the second-to-last bellows, includes the following steps: When the current valve opening of the penultimate bellows is less than or equal to the second preset opening, the valve of the penultimate bellows is controlled to be adjusted down by a third change from the current valve opening. Determine whether the valve opening of the second air box after adjustment is less than or equal to the third preset opening; When the valve opening of the second air box is less than or equal to the third preset opening, it is determined that the valve opening adjustment of the penultimate air box is completed, and production continues in the current production state.

6. The method for improving the utilization rate of sintering waste heat according to claim 5, characterized in that, After determining whether the valve opening of the second air box is less than or equal to the third preset opening, the step further includes the following steps: When the valve opening of the second wind box is greater than the third preset opening, the current valve opening of the penultimate wind box is kept unchanged and maintained for the third preset time. Then, the outlet flue gas temperature of the sintering flue is obtained at the end of the third preset time. Determine whether the outlet flue gas temperature is less than or equal to a third preset temperature; When the outlet flue gas temperature is less than or equal to the third preset temperature, it is determined that the valve opening adjustment of the penultimate air box has ended, and production continues in the current production state. When the outlet flue gas temperature is greater than the third preset temperature, return to the step of continuing to control the valve of the penultimate air box to decrease the third change amount from the current valve opening.

7. A device for improving the utilization rate of sintering waste heat, characterized in that, include: The acquisition unit is used to acquire the current production status information of the sintering machine and acquire the sintering endpoint position based on the current production status information. The judgment unit is used to determine whether the sintering endpoint position is within the normal production range; wherein, the normal production range is the range between the end of the second-to-last wind box and the beginning of the fourth-to-last wind box; The regulating unit is used to determine the current air box corresponding to the sintering endpoint position when the sintering endpoint position is within the normal production range, and to lower the valve opening of the air box after the current air box in order to reduce the flue gas temperature in the sintering flue.

8. A device for improving the utilization rate of sintering waste heat, characterized in that, The method includes a memory, a processor, and a program stored in the memory and executable on the processor for improving the utilization rate of sintering waste heat. When the processor executes the program for improving the utilization rate of sintering waste heat, it implements the steps of the method for improving the utilization rate of sintering waste heat as described in any one of claims 1 to 6.

9. A storage medium storing a program for improving the utilization rate of sintering waste heat, characterized in that, When the program for improving the utilization rate of sintering waste heat is executed by the processor, it implements the steps of the method for improving the utilization rate of sintering waste heat as described in any one of claims 1 to 6.

10. A program product, characterized in that, The program product includes a program for improving the utilization rate of sintering waste heat, which, when executed by a processor, implements the steps of the method for improving the utilization rate of sintering waste heat as described in any one of claims 1 to 6.

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