A three-phase composite heating type low-carbon sintering device and method

Abstract

A three-phase composite heating type low-carbon sintering device, characterized in that: the device comprises a sintering machine trolley (1), a bottom gas injection system (2) and a heating source; the bottom gas injection system (2) is arranged below the sintering machine trolley (1); along the running direction of the sintering machine trolley (1), the heating source is arranged on the side of the sintering machine trolley (1). The present invention introduces gas injection heating and heating source ignition heating on the basis of the existing solid fuel providing the heat required for sintering, thereby realizing three-phase composite heating of solid fuel, gas and heating source, so that the role of adding solid fuel to the sintering material layer in the prior art is gradually replaced by the ignition of the heating source and the heat release of gas combustion, thereby realizing "low-carbon sintering" with less coke ratio.

Description

Technical Field

[0001] The invention relates to a composite heating type low-carbon sintering process, in particular to a three-phase composite heating type low-carbon sintering device and a method thereof, belonging to the technical field of sintering. Background Art

[0002] The sintering process is a key link in the iron-making process. The principle is to mix various powdered iron-containing raw materials with appropriate amounts of fuel and flux, add appropriate amounts of water, mix and pelletize them, and then use the sintering equipment to make the materials undergo a series of physical and chemical changes and sinter them into blocks, which are then sent to the blast furnace for the next step.

[0003] In order to reduce the coke ratio and smelting cost of blast furnace ironmaking, the blast furnace often requires high strength and high reducibility for sintered ore. In the sintering process, the sintered ore is generally required to have high strength, high finished product rate, low return rate, and low fuel consumption. Sintered ore with high strength and high reducibility consumes less coke during blast furnace smelting, thereby reducing carbon dioxide emissions. From a long-term perspective, the requirement for carbon dioxide emission reduction will become one of the bottlenecks restricting the development of the steel industry. According to relevant information, carbon dioxide emissions from sintering and blast furnace processes account for about 60% of total industrial emissions. Therefore, whether from the perspective of reducing costs for enterprises or from the perspective of environmental protection, reducing the proportion of sintering solid fuel consumption and reducing the fuel ratio of blast furnace charge have become urgent needs for ironmaking technology.

[0004] In this environment, the "sintering material surface gas fuel injection technology" developed by Japan's JFE Corporation came into being. Its principle is to use a blowing device to inject gas fuel diluted to below the lower limit of the combustible concentration above the sintering trolley at a distance behind the ignition furnace, so that it burns and supplies heat in the sintering material layer. This technology can reduce the amount of solid carbon and CO2 emissions in sintering ore production. At the same time, since the combustion of gas fuel widens the high-temperature zone width of the sintering material layer during production, the sintering ore temperature time of 1200-1400℃ is extended, thereby effectively enhancing the strength of the sintered ore and the 5-10mm porosity.

[0005] There are two production modes of sintering methods in the existing technology: solid fuel sintering and gas-solid two-phase fuel sintering. Among them, the system device structure under conventional solid fuel sintering technology is as follows: Figure 1 As shown: after the solid fuel coal is mixed with the sintering mixture, it is evenly spread on the sintering machine trolley to form a material layer of a certain thickness. After ignition by the ignition furnace, a high-temperature combustion zone is formed in the material layer. While the trolley moves from the head to the tail of the machine, the air passes through the material layer from top to bottom under the action of the main exhaust fan, passes through the exhaust bellows and the large flue, and is finally discharged from the chimney. The combustion zone also moves downward at a uniform speed under the action of negative pressure and downward air, and finally moves from the top of the material layer to the bottom of the material layer, completing the sintering of the entire material layer.

[0006] The system structure of gas-solid two-phase fuel sintering technology is as follows: Figure 2 As shown: the injection device consists of a gas main, a gas branch, a gas injection pipe row, and a injection hood. One end of the gas main is connected to the gas pipeline in the plant area, and the other end is connected to the injection pipe row through the gas branch through the injection hood. The injection pipe row is located in the injection hood and above the sintering machine trolley. During the production of the gas injection enhanced sintering system, the gas enters the gas main from the gas pipeline in the plant area, then enters the gas branch, and finally enters the injection pipe row and sprays out. In the injection hood, it mixes with the air in the hood to form a mixed gas with the required concentration, and enters the sintering material layer to participate in combustion-assisted sintering. Under this technology, the high-temperature combustion zone is formed by the heat release of solid fuel coal and gas fuel gas.

[0007] Solid fuel sintering and gas-solid two-phase fuel sintering, these two modes have been found to have the following defects in long-term production:

[0008] 1. Solid fuel sintering mode: Conventional sintering is mostly solid fuel mode, which has the disadvantage that it cannot achieve ideal fuel segregation distribution in the material layer, and can only be evenly distributed throughout the material layer. This leads to excess heat supply in the lower unit that requires less heat than the upper unit, which not only wastes energy, but also causes high carbon emissions in the sintering process;

[0009] 2. Gas-solid two-phase fuel sintering mode: The newly developed gas-solid two-phase fuel mode sprays hydrogen-based gaseous fuel on the sintering material surface, so that it is sucked into the material layer to participate in combustion and heat supply, thereby replacing part of the solid fuel. Although this mode achieves fuel segregation distribution on the basis of the solid fuel mode, greatly reducing carbon consumption and carbon emissions, the hydrogen-based fuel gas cannot form a high-temperature combustion zone that moves stably and uniformly in the material layer, so its proportion of replacing solid fuel is limited and can only be controlled below 30%, which is still a certain distance from the national "low-carbon and carbon-free smelting" requirements. Summary of the invention

[0010] In view of the defects existing in the above-mentioned prior art, the present invention optimizes and improves the existing sintering mode and equipment, and develops a three-phase composite heating type low-carbon sintering device and method thereof. The device of the present invention includes a sintering machine trolley, a bottom gas injection system arranged under the sintering machine trolley, and a heating source (positive and negative electrode source or microwave heating source) arranged on both sides of the sintering machine trolley. Based on structural innovation, the present invention proposes that in the sintering process, on the basis of solid fuel providing the heat required for sintering, gas injection heating and heating source ignition heating are introduced at the same time to realize three-phase composite heating of solid fuel, gas and heating source, so that the role of adding solid fuel to the sintering material layer in the prior art is gradually replaced by the ignition of the heating source and the heat release of gas combustion, thereby realizing "low-carbon sintering" with less coke ratio, or even "carbon-free sintering" with zero coke ratio.

[0011] According to a first embodiment of the present invention, a gas-solid-electricity three-phase composite heating type low-carbon sintering device is provided.

[0012] A gas-solid-electricity three-phase composite heating type low-carbon sintering device, the device comprises a sintering machine trolley, a bottom gas injection system and a positive and negative electrode source. The bottom gas injection system is arranged below the sintering machine trolley. The positive and negative electrode source comprises a positive electrode and a negative electrode. Along the running direction of the sintering machine trolley, the positive electrode and the negative electrode are respectively arranged on both sides of the sintering machine trolley.

[0013] In the present invention, the device further comprises an exhaust bellows and a large flue. The exhaust bellows is arranged above the sintering machine trolley. The large flue is arranged above the exhaust bellows and communicated with the exhaust bellows.

[0014] Preferably, a sealing cover is provided between the sintering machine trolley and the exhaust air box. The sealing cover is located on the upper part of the sintering machine trolley and is connected to the exhaust air box.

[0015] In the present invention, the number of the positive and negative electrode sources is multiple, and each positive and negative electrode source includes a positive electrode and a negative electrode. Along the running direction of the sintering machine trolley, the positive electrodes of each positive and negative electrode source are sequentially arranged on the same side of the sintering machine trolley, and the setting height of each positive electrode is increased sequentially, that is, the positive electrodes of each positive and negative electrode source form a positive electrode group that is inclined upward on the same side of the sintering machine trolley as a whole. Preferably, the negative electrodes of each positive and negative electrode source are sequentially arranged on the other side of the sintering machine trolley. The negative electrodes and positive electrodes on both sides of the sintering machine trolley are symmetrically distributed in terms of quantity and setting position.

[0016] Preferably, the device further comprises a conductive grid plate arranged in the sintering machine trolley. Preferably, the number of the conductive grid plates is multiple. The multiple conductive grid plates are arranged in rows in sequence along the width direction of the sintering machine trolley. Further preferably, the multiple conductive grid plates are arranged in rows in sequence along the running direction of the sintering machine trolley. Two adjacent rows of conductive grid plates are arranged in a staggered manner, and the conductive grid plates in the latter row are arranged corresponding to the gap between two adjacent conductive grid plates in the former row of conductive grid plates.

[0017] Preferably, the sintering mixture on the sintering machine trolley is further provided with a number of evenly distributed conductive steel fibers. Preferably, the conductive steel fibers are in the shape of thin strips. The size of the conductive steel fibers is 1 to 10 mm, preferably 3 to 8 mm. Preferably, the spacing between two adjacent conductive grid plates is 300 to 1200 mm, preferably 500 to 1000 mm.

[0018] Preferably, in each row of the conductive grid plates, the spacing between each two adjacent conductive grid plates is the same. Preferably, the spacing L between two adjacent conductive grid plates satisfies the following relationship:

[0019]

[0020] Where: L is the distance between two adjacent conductive grid plates, mm. d is the average particle size of the sintered mixture, mm. γ is the total iron content in the sintered mixture. ω is the moisture content in the sintered mixture. β is the conductive steel fiber content in the sintered mixture. a, b, c, e are the spacing adjustment constants, a is 0.1-0.5, b is 0.1-0.5, c is 0.1-1, and e is 0-5.

[0021] According to a second embodiment of the present invention, a gas-solid microwave three-phase composite heating type low-carbon sintering device is provided.

[0022] A gas-solid microwave three-phase composite heating type low-carbon sintering device, the device comprises a sintering machine trolley, a bottom gas injection system and a microwave heating source. The bottom gas injection system is arranged below the sintering machine trolley. Along the running direction of the sintering machine trolley, the microwave heating source is arranged on the side of the sintering machine trolley.

[0023] In the present invention, the device further comprises an exhaust bellows and a large flue. The exhaust bellows is arranged above the sintering machine trolley. The large flue is arranged above the exhaust bellows and communicated with the exhaust bellows.

[0024] Preferably, a sealing cover is provided between the sintering machine trolley and the exhaust air box. The sealing cover is located on the upper part of the sintering machine trolley and is connected to the exhaust air box.

[0025] In the present invention, the number of the microwave heating sources is multiple, and the multiple microwave heating sources are respectively arranged on both sides of the sintering machine trolley. Along the running direction of the sintering machine trolley, the microwave heating sources on the same side are arranged in sequence, and the setting heights of the microwave heating sources are increased in sequence, that is, the microwave heating sources on the same side form a microwave heating source group arranged obliquely upward as a whole. Preferably, the microwave heating sources on both sides of the sintering machine trolley are symmetrically distributed in number and setting positions.

[0026] In the present invention, the bottom fuel gas injection system comprises a bottom fuel injection hood, a fuel injection pipe and a reflector. The bottom fuel injection hood is arranged below the sintering machine trolley and connected to the bottom of the sintering machine trolley. The fuel injection pipe and the reflector are both arranged in the bottom fuel injection hood. The fuel injection pipe is provided with a fuel injection hole. The reflector is arranged below the fuel injection pipe. Preferably, the fuel injection pipe is provided with a fuel gas valve.

[0027] Preferably, the jet hole is arranged at the lower half of the jet pipe. Preferably, the radial direction of the jet hole is arranged to deviate from the vertical direction. The reflector is located on the jet extension line of the jet hole.

[0028] Preferably, the bottom fuel gas injection system includes a plurality of injection pipes. A gap is left between two adjacent injection pipes. The reflector is correspondingly arranged at the gap position between two adjacent injection pipes. Preferably, the number of the injection pipes is m, and the value of m is 2 to 50, preferably 3 to 20. The number of the reflector is ≥ m+1.

[0029] In the present invention, the device further comprises a free-moving microwave source. The free-moving microwave source comprises a track, a mobile microwave source, and a driving motor. The track is arranged on the side of the sintering machine trolley. The mobile microwave source is arranged on the track. The driving motor is connected to the mobile microwave source and drives the mobile microwave source to perform free horizontal movement along the track. Preferably, the free-moving microwave source is symmetrically arranged on both sides of the sintering machine trolley.

[0030] In the present invention, n exhaust air bellows are arranged above the sintering machine trolley, and the value of n is 18 to 39, preferably 21 to 36, and more preferably 24 to 30. Each exhaust air bellows is connected to the large flue through its own bellows branch pipe. Preferably, each exhaust air bellows is provided with a pressure detection device.

[0031] In the present invention, a sealing device is provided at the connection position between the sealing cover and the sintering machine trolley. Preferably, the sealing device is a liquid sealing device.

[0032] Preferably, the device further comprises a detection device arranged on the sintering machine trolley. The detection device extends into the sintered ore belt in the sintering material layer. Preferably, the device further comprises a gas concentration detection device arranged on the sealing cover. The gas concentration detection device extends into the sealing cover.

[0033] Preferably, the device further comprises a control system. The control system is connected with the detection device, the pressure detection device, the gas concentration detection device, the gas valve of the bottom gas injection system, the positive and negative electrode sources, the microwave heating source, the mobile microwave source of the free-moving microwave source and the driving motor, and controls the operation of the detection device, the pressure detection device, the gas concentration detection device, the gas valve, the positive and negative electrode sources, the microwave heating source, the mobile microwave source and the driving motor.

[0034] According to a third embodiment of the present invention, a gas-solid-electricity three-phase composite heating type low-carbon sintering method is provided.

[0035] A gas-solid-electric three-phase composite heating type low-carbon sintering method or a method for low-carbon sintering using the device described in the first embodiment, the method comprising the following steps:

[0036] 1) Place the sintering mixture on the sintering machine trolley, turn on the positive and negative electrode sources, ignite and run, and at the same time open the gas valve of the bottom gas injection system.

[0037] 2) The control system monitors the porosity of the sintered ore in real time through the detection device. During the real-time monitoring process, the control system compares the detected real-time sintered ore porosity Z with the target sintered ore porosity Z0.

[0038] 201) If the real-time sinter porosity Z = the target sinter porosity Z0, that is, the sinter quality index is within the normal range at this time, the device continues to operate.

[0039] 202) If the real-time sintered ore porosity Z is less than the target sintered ore porosity Z0, it is determined that the sintered ore is overburned. The control system controls the gas valve to be adjusted down so that Z=Z0.

[0040] 203) If the real-time sinter porosity Z>the target sinter porosity Z0, it is determined that the sinter is over-sintered. The control system controls the gas valve to increase or the solid fuel ratio in the sintering mixture to make Z=Z0.

[0041] Preferably, the target sintered ore porosity Z0 is in the range of 10%-30%, preferably 10%-20%, and more preferably 10%-15%.

[0042] Preferably, step 1) also includes a step of adding conductive steel fibers, specifically: before the sintering mixture is distributed to the sintering machine trolley, the conductive steel fibers are added during the second mixing process of the sintering mixture, and the conductive steel fibers are evenly mixed with the sintering mixture to obtain the sintering mixture.

[0043] Preferably, the fuel gas injected by the bottom fuel gas injection system is hydrogen-rich fuel gas. Preferably, the volume proportion of hydrogen in the hydrogen-rich fuel gas is greater than 50%, preferably greater than 60%.

[0044] In the present invention, the method further comprises:

[0045] 3) The control system monitors the negative pressure of each exhaust bellows in real time through the pressure detection device installed on each exhaust bellows. During the real-time monitoring process, once it is detected that the real-time negative pressure P of the exhaust bellows is greater than the target negative pressure P0, it is determined that the negative pressure of the sintering material layer is too large.

[0046] The control system determines the exhaust bellows corresponding to the position where the negative pressure of the sintering material layer is too large through the pressure detection device, and then controls the driving motor to move the mobile microwave source of the free movable microwave source to the corresponding position of the exhaust bellows, turns on the mobile microwave source to heat the sintering material layer at that position, so that P=P0.

[0047] Preferably, the target negative pressure P0 is in the range of 10000-20000 Pa, preferably 10000-18000 Pa, and more preferably 10000-15000 Pa.

[0048] In the present invention, the step 203) is specifically: if the real-time sintered ore porosity Z> the target sintered ore porosity Z0, it is determined that the sintered ore is over-grown. The control system detects the real-time gas concentration C in the sintering machine trolley through the gas concentration detection device.

[0049] If the real-time gas concentration C is less than the lower explosion limit concentration C max At this time, the control system controls the gas valve to increase so that Z = Z0. If the real-time gas concentration C ≥ the lower limit of gas explosion concentration C max At this time, the control system controls the solid fuel ratio in the sintering mixture to increase so that Z = Z0. Preferably, the lower explosion limit concentration of the gas C max The value range is 4%-5%.

[0050] According to a fourth embodiment of the present invention, a gas-solid microwave three-phase composite heating type low-carbon sintering method is provided.

[0051] A gas-solid microwave three-phase composite heating type low-carbon sintering method or a method for low-carbon sintering using the device described in the second embodiment, the method comprising the following steps:

[0052] 1) Place the sintering mixture on the sintering machine trolley, turn on the microwave heating source, ignite and run, and at the same time open the gas valve of the bottom gas injection system.

[0053] 2) The control system monitors the porosity of the sintered ore in real time through the detection device. During the real-time monitoring process, the control system compares the detected real-time sintered ore porosity Z with the target sintered ore porosity Z0.

[0054] 201) If the real-time sinter porosity Z = the target sinter porosity Z0, that is, the sinter quality index is within the normal range at this time, the device continues to operate.

[0055] 202) If the real-time sinter porosity Z is less than the target sinter porosity Z0, it is determined that the sinter is overburned. The control system controls the gas valve to be reduced or the microwave power of the microwave heating source to be reduced so that Z=Z0.

[0056] 203) If the real-time sintered ore porosity Z>the target sintered ore porosity Z0, it is determined that the sintered ore is over-sintered. The control system controls the gas valve to increase or the microwave power of the microwave heating source to make Z=Z0.

[0057] Preferably, the target sintered ore porosity Z0 is in the range of 10%-30%, preferably 10%-20%, and more preferably 10%-15%.

[0058] In the present invention, the method further comprises:

[0059] 3) The control system monitors the negative pressure of each exhaust bellows in real time through the pressure detection device installed on each exhaust bellows. During the real-time monitoring process, once it is detected that the real-time negative pressure P of the exhaust bellows is greater than the target negative pressure P0, it is determined that the negative pressure of the sintering material layer is too large.

[0060] The control system determines the exhaust bellows corresponding to the position where the negative pressure of the sintering material layer is too large through the pressure detection device, and then controls the driving motor to move the mobile microwave source of the free movable microwave source to the corresponding position of the exhaust bellows, turns on the mobile microwave source to heat the sintering material layer at that position, so that P=P0.

[0061] Preferably, the target negative pressure P0 is in the range of 10000-20000 Pa, preferably 10000-18000 Pa, and more preferably 10000-15000 Pa.

[0062] In the present invention, the step 203) is specifically: if the real-time sintered ore porosity Z> the target sintered ore porosity Z0, it is determined that the sintered ore is over-grown. The control system detects the real-time gas concentration C in the sintering machine trolley through the gas concentration detection device.

[0063] If the real-time gas concentration C is less than the lower explosion limit concentration C max At this time, the control system controls the gas valve to increase so that Z = Z0. If the real-time gas concentration C ≥ the lower limit of gas explosion concentration C max At this time, the control system controls the microwave power of the microwave heating source to increase so that Z = Z0. Preferably, the lower explosion limit concentration of the gas C max The value range is 4%-5%.

[0064] Preferably, the fuel gas injected by the bottom fuel gas injection system is hydrogen-rich fuel gas. Preferably, the volume proportion of hydrogen in the hydrogen-rich fuel gas is greater than 50%, preferably greater than 60%.

[0065] In view of the defects that the ideal fuel segregation distribution of the material layer cannot be achieved in the solid fuel sintering mode in the prior art, and the replacement ratio of the solid fuel in the gas-solid two-phase fuel sintering mode is limited, the present invention proposes a three-phase composite heating type low-carbon sintering device. The device includes a sintering machine trolley, a bottom gas injection system arranged under the sintering machine trolley, and a heating source arranged on both sides of the sintering machine trolley. The heating source is a positive and negative electrode source or a microwave heating source. Based on structural innovation, the present invention proposes that in the sintering process, on the basis of solid fuel providing the heat required for sintering, gas injection heating and positive and negative electrode sources or microwave heating sources are introduced at the same time to ignite and supply heat, so as to realize the three-phase composite heating of solid fuel, gas, positive and negative electrode sources or microwave heating sources, so that the role of adding solid fuel to the sintering material layer in the prior art is gradually replaced by the ignition of positive and negative electrode sources or microwave heating sources and the heat release of gas combustion, thereby realizing "low-carbon sintering" with less coke ratio, or even "carbon-free sintering" with zero coke ratio.

[0066] In the present invention, the gas to be injected is hydrogen-rich gas (for example, the volume proportion of hydrogen is greater than 60%). The density of hydrogen-rich gas is lighter than that of air, and it is very easy to escape upwards, which is inconsistent with the law that the gas needs to move downward during traditional sintering production. Therefore, the conventional downward ventilation mode is adopted, and it is easy for the gas to escape and drift. Therefore, the present invention proposes to change the downward ventilation production mode of the original sintering machine and adopt the upward ventilation production mode during the sintering process. After switching to the upper ventilation mode, the upward movement of the hydrogen-rich gas is consistent with the production demand, and the gas escape rate will be greatly reduced. The present invention adopts a three-phase composite heating of solid fuel, gas, positive and negative electrode sources or microwave heating sources. The injected gas is changed from conventional gas to hydrogen-rich gas. The participation of hydrogen-rich gas in combustion can effectively reduce the multiple pollutants brought by coke combustion, and can more replace the role of adding solid fuel (coke) in the sintering material layer, so as to be more conducive to achieving "low-carbon sintering" with less coke ratio or "carbon-free sintering" with zero coke ratio. Based on this, the present invention moves the large flue and the exhaust bellows to the upper part of the sintering machine trolley, and sets a sealing cover at the lower part of the exhaust bellows and between the sintering machine trolley. A sealing device (such as a liquid sealing device) is also provided at the connection position between the sealing cover and the sintering machine trolley, and the sealing cover is tightly connected to the sintering machine trolley through the sealing device on the side.

[0067] In order to cooperate with the upper exhaust production mode, the present invention adds a bottom gas injection system under the sintering machine trolley. The bottom gas injection system includes a bottom injection hood, an injection pipe and a reflection plate. Among them, the bottom injection hood is arranged under the sintering machine trolley and is tightly connected to the bottom of the sintering machine trolley. The setting of the bottom injection hood can avoid the leakage of gas during the gas injection process, protect the environment, and improve the safety of the system. The injection pipe and the reflection plate are both arranged in the bottom injection hood. The injection pipe is provided with an injection hole. The reflection plate is arranged below the injection pipe. When the bottom gas injection system is turned on, the gas is ejected from the injection hole on the injection pipe, and the reflection plate is responsible for reflecting the ejected gas upward. The gas is then sucked into the sintering material layer, ignited by high temperature, and contributes heat to the sintering reaction.

[0068] Preferably, the jet hole is arranged at the lower half of the jet pipe. Generally speaking, the radial direction where the jet hole is located deviates from the vertical direction, that is, the direction of the line connecting the position of the jet hole and the axis of the jet pipe in the radial plane forms a certain angle with the vertical direction. Figure 6 As shown, the gas is ejected through the gas jet holes along the lower sides of the gas jet pipe. In order to better reflect the gas upward in a full range, the reflector is arranged on the extension line of the gas jet hole. The bottom gas injection system of the present invention includes a plurality of gas jet pipes, and a gap is left between two adjacent gas jet pipes. The reflector is arranged at the gap position between two adjacent gas jet pipes. Among them, the two reflectors arranged near the two sides of the sintering machine trolley are arranged at the gap position between the gas jet pipe and the side wall of the bottom gas jet cover, as shown in FIG. Figure 3 As shown. The gas ejected from the gas jet hole just sprays on the reflector plate. After colliding with the reflector plate, the gas turns upward. At the same time, under the action of the upper exhaust mode, the gas passes upward through the gaps between the gas jet pipes and enters the sintering material layer to burn, thereby providing heat for the sintering reaction. In the present invention, the bottom gas injection system also includes a gas valve. The gas valve can be directly set on each gas jet pipe (not shown in the figure), or it can be set on the gas jet main pipe connected to each gas jet pipe. The setting of the gas valve can control the real-time gas injection amount, and then control the heat supply provided by the gas injection, which is conducive to the smooth progress of the sintering production.

[0069] In the present invention, the number of the positive and negative electrode sources is multiple. Among them, the specific number of positive and negative electrode sources can be adjusted as needed (for example, according to the length of the sintering machine or the on-site production situation, etc.). Each positive and negative electrode source includes a positive electrode and a negative electrode, and the positive electrodes of each positive and negative electrode source are sequentially arranged on the same side of the sintering machine trolley, and the negative electrodes of each positive and negative electrode source are sequentially arranged on the other side of the sintering machine trolley, thereby enhancing the heating effect of the ignition and heating of the positive and negative electrode sources during the sintering process. In order to cooperate with the production mode of exhaust, the positive electrodes of each positive and negative electrode source are sequentially arranged on the same side of the sintering machine trolley, and the setting height of each positive electrode is increased in sequence, that is, the positive electrodes of each positive and negative electrode source form a positive electrode group arranged obliquely upward on the same side of the sintering machine trolley as a whole. Preferably, the negative electrodes and positive electrodes on both sides of the sintering machine trolley are symmetrically distributed in number and setting position, that is, a positive electrode group inclined upward is arranged on one side of the sintering machine trolley, and a negative electrode group inclined upward is symmetrically arranged on the other side of the sintering machine trolley. The present invention changes the traditional downward exhaust mode to an upward exhaust mode. Therefore, as the position of the sintering machine changes from the head to the tail (i.e., along the running direction of the sintering machine trolley), the combustion zone in the sintering material layer continuously moves upward. Therefore, the installation height of the positive and negative electrode sources also moves upward as the position of the combustion zone changes, thereby forming two rows of positive and negative electrode source groups with a certain slope. The positive and negative electrode sources play the role of generating breakdown current and forming electric sparks in the material layer at the corresponding height, thereby igniting the gas in the area.

[0070] In the present invention, the number of the microwave heating sources is multiple. Among them, the specific number of microwave heating sources can be adjusted as needed (for example, according to the length of the sintering machine or the on-site production situation, etc.). The multiple microwave heating sources are respectively arranged on both sides of the sintering machine trolley, so as to enhance the heating effect of microwave ignition heating during the sintering process. In order to cooperate with the production mode of upper exhaust, the microwave heating sources on the same side of the sintering machine trolley are arranged in sequence, and the setting height of each microwave heating source is increased in sequence, that is, the microwave heating sources on the same side form a microwave heating source group arranged obliquely upward as a whole. Preferably, the microwave heating sources on both sides of the sintering machine trolley are symmetrically distributed in number and setting position, that is, the microwave heating source groups inclined upward are symmetrically arranged on both sides of the sintering machine trolley. The present invention changes the traditional downward exhaust mode to an upward exhaust mode, so that as the position of the sintering machine changes from the head to the tail (i.e., along the running direction of the sintering machine trolley), the combustion zone in the sintering material layer continuously moves upward, and thus, the installation height of the microwave heating source also moves upward as the position of the combustion zone changes, thereby forming two rows of microwave heating source groups with a certain slope. The microwave heating sources arranged at different positions and heights heat the sintering material layers at corresponding positions and heights, so that the sintering material layers reach the ignition point temperature of the gas, thereby providing the heat required for sintering for the sintering process.

[0071] As a preferred embodiment, the present invention also includes a free-moving microwave source arranged on the side of the sintering machine trolley. In order to enhance the heating effect of the free-moving microwave source during the sintering process, the free-moving microwave source is correspondingly arranged on both sides of the sintering machine trolley. The free-moving microwave source includes a track, a mobile microwave source, and a driving motor. Among them, the track is arranged on the side of the sintering machine trolley, the mobile microwave source is arranged on the track, the driving motor is connected to the mobile microwave source, and drives the mobile microwave source to move freely horizontally along the track. Under the action of the driving motor, the mobile microwave source of the free-moving microwave source moves along the track to the desired position, and the mobile microwave source heats the sintering material layer at the corresponding position, so that the heat storage in the sintering material layer increases, thereby alleviating the condensation behavior of water vapor in the sintering material layer.

[0072] Further preferably, in the scheme of gas-solid-electric three-phase composite heating type low-carbon sintering, the present invention adds a means of strengthening conduction on the basis of the prior art, specifically including adding a number of conductive steel fibers in the sintering mixture and adding a conductive grid plate in the sintering machine trolley. Among them, the conductive steel fiber is in the shape of thin strips, and the size of the conductive steel fiber is 1 to 10 mm (preferably 3 to 8 mm). The conductive steel fiber is added at the rear of the sintering second mixture, that is, it is evenly mixed with the sintering first mixture, which plays a role in strengthening the conductivity of the material layer.

[0073] The conductive grid plate is set as Figure 7 and 8 As shown, the conductive grid plates are evenly arranged in a staggered manner in the sintering machine trolley, and the spacing between adjacent conductive grid plates is 300 to 1200 mm (preferably 500 to 1000 mm). The conductive grid plates mainly play the role of strengthening the current conduction in the material layer, wherein the spacing L between adjacent conductive grid plates is inversely proportional to the content β of the conductive steel fiber in the sintering mixture, and the specific formula is as follows:

[0074]

[0075] Where: L is the distance between two adjacent conductive grid plates, mm. d is the average particle size of the sintered mixture, mm. γ is the total iron content in the sintered mixture. ω is the moisture content in the sintered mixture. β is the conductive steel fiber content in the sintered mixture. a, b, c, e are the spacing adjustment constants, a is 0.1-0.5, b is 0.1-0.5, c is 0.1-1, and e is 0-5.

[0076] The present invention also includes a detection device arranged on the sintering machine trolley, the detection device extends into the sintering ore belt of the sintering material layer, and is used to detect the real-time sintering ore quality index (that is, the finished sintering ore is subjected to mineral phase analysis by the detection device to obtain the porosity of the finished sintering ore). The real-time detection result of the detection device can determine whether the sintering ore quality index is within the normal range, and then adaptively adjust the specific sintering process. The present invention also includes a pressure detection device arranged on each exhaust bellows on the sintering machine trolley, the pressure detection device is used to detect the real-time negative pressure in the corresponding exhaust bellows, and then determine whether the negative pressure in the sintering material layer is too large, and at the same time determine the exhaust bellows corresponding to the position where the negative pressure in the sintering material layer is too large. A gas concentration detection device is also provided on the sealing cover on the sintering machine trolley, and the gas concentration detection device is used to detect the real-time gas concentration in the sintering machine trolley, and then determine whether the real-time gas concentration in the sintering machine trolley reaches the lower explosion limit concentration of the gas.

[0077] When the three-phase composite heating type low-carbon sintering device of the present invention is used for gas injection enhanced sintering production, the gas is ejected through the jet hole below the jet pipe of the bottom gas injection system, and the ejected gas collides with the reflector plate and then reflects and diffuses. The gas is simultaneously affected by the reflection force, its own buoyancy and the upper negative pressure attraction, and is evenly mixed with the air in the bottom jet hood and then enters the bottom of the sintering material layer of the sintering machine trolley. At the same time, the positive and negative electrode sources arranged on both sides of the sintering machine trolley generate breakdown currents and electric sparks in the sintering material layer at the corresponding height layer by layer along the running direction of the sintering machine trolley, and heat the sintering material layer to the gas ignition point temperature under the enhanced conductivity and conduction of the conductive steel fiber and the conductive grid plate, and then use the heated sintering material layer to ignite the gas. Alternatively, the microwave heating sources arranged on both sides of the sintering machine trolley heat the sintering material layers of different corresponding heights layer by layer along the running direction of the sintering machine trolley to the gas ignition point temperature, and use microwaves to heat the sintering material layer, and use the heated sintering material layer to ignite the gas. In this way, a continuous flow of gas is formed to rise into the sintering material layer, and is ignited at different heights of the sintering material layer along the running direction of the sintering machine trolley, thereby forming a "gradually upward" combustion zone in the layer in disguise, and finally completing the sintering production of the entire material layer. Therefore, in the present invention, the formation of the combustion zone in the sintering material layer is mainly formed by the ignition of the positive and negative electrode sources or microwave heating sources, and the heat release of the combustion of the gas, and the residence time and peak temperature of the combustion zone at each height are controlled by the positive and negative electrode sources (or microwave heating sources) and the gas concentration. Therefore, the role of adding coke to the sintering material layer in the prior art has been basically replaced or even completely replaced in theory, that is, the three-phase composite heating mode proposed in the present invention can achieve "low-carbon sintering" with less coke ratio, and can even achieve "carbon-free sintering" with zero coke ratio.

[0078] Accordingly, since the present invention realizes "carbon-free" or "low-carbon" sintering, the dioxins and NO x The contents of many pollutants such as CO x It can also achieve substantial emission reductions and realize low-carbon green sintering that meets the country's carbon peak and carbon neutrality goals.

[0079] Based on the development of the above-mentioned low-carbon sintering device, the present invention also develops a set of adaptive control methods matching the device. In this method, after the system starts running, the gas valve of the bottom gas injection system and the power supply of the positive and negative electrode source or the microwave heating source are opened, and the real-time sintered ore quality indicators in the production process are monitored at the same time.

[0080] If the sinter quality index is monitored to be within a reasonable range (i.e., the real-time sinter porosity is within the target sinter porosity range), no adjustment is required and the device can continue to operate. If the sinter quality index is monitored to be beyond a reasonable range (i.e., the real-time sinter porosity is not within the target sinter porosity range), the control system determines that the sinter is overburned or over-sintered. If the real-time sinter porosity is less than the target sinter porosity, that is, due to excessive heat supply, dense glass phase silicates are produced, resulting in insufficient porosity, and it is determined that the sinter is overburned. If the real-time sinter porosity is greater than the target sinter porosity, that is, due to insufficient heat supply, the temperature required for the sintering reaction is not reached, and the liquid phase is not formed, resulting in excessive porosity, and it is determined that the sinter is over-sintered.

[0081] If the control system determines that the sintered ore is overburned, the gas valve opening is appropriately reduced or the microwave heating source power is lowered to reduce the heat supply, so that the real-time sintered ore porosity returns to the target sintered ore porosity range, and the sintered ore quality index returns to a reasonable range. If the control system determines that the sintered ore is over-burned, the control system needs to first determine whether the gas concentration in the injection feed layer has reached or is close to the lower explosion limit concentration value of the gas based on the real-time gas concentration in the sintering machine trolley detected by the gas concentration detection device; if so, the solid fuel ratio in the sintering mixture is increased or the microwave power is increased to increase the heat supply; if not, the gas valve is appropriately increased to increase the heat supply, so that the real-time sintered ore porosity returns to the target sintered ore porosity range, that is, the sintered ore quality index returns to a reasonable range.

[0082] The present invention also includes the step of monitoring and adjusting the real-time negative pressure of each exhaust bellows during the production process. The control system monitors the negative pressure of each exhaust bellows of the sintering machine in real time through the pressure detection device set on each exhaust bellows. Once it is detected that the real-time negative pressure of the exhaust bellows is greater than the target negative pressure, it is determined that the negative pressure of the sintering material layer is too large. At this time, the control system will find the position of the large negative pressure bellows through the pressure detection device on each exhaust bellows, and then move the mobile microwave source of the free-moving microwave source to this position and turn it on, heating the material layer at this position, thereby alleviating the condensation behavior of water vapor in the over-humidified layer.

[0083] In the present invention, the target sintered ore porosity is the normal porosity of the finished sintered ore obtained when the sintering production is operating normally. Correspondingly, the target negative pressure is the normal negative pressure of each exhaust bellows of the sintering machine when the sintering production is operating normally. Generally speaking, the value range of the target sintered ore porosity Z0 is 10%-30%, preferably 10%-20%, more preferably 10%-15%, for example 10%, 12%, 15%. The value range of the target negative pressure P0 is 10000-20000Pa, preferably 10000-18000Pa, more preferably 10000-15000Pa, for example 10000Pa, 13000Pa, 15000Pa. The lower explosion limit concentration C of the gas max The value range is 4%-5%, for example 4%, 4.5%, 5%.

[0084] After the operation is completed, the control system will confirm whether this operation ultimately makes the sintering indicators (including the porosity of the sintered ore and the negative pressure of the exhaust bellows) return to the normal and reasonable range. If not, it will return to continue processing. If so, the system operation ends and enters the next cycle.

[0085] Compared with the prior art, the present invention has the following beneficial technical effects:

[0086] 1. It can greatly improve the carbon reduction ratio and realize "low-carbon" or "carbon-free" sintering: On the basis of the existing solid fuel providing the heat required for sintering, the present invention simultaneously introduces gas injection heating and positive and negative electrode source or microwave heating source ignition heating, thereby realizing three-phase composite heating of solid fuel, gas, and positive and negative electrode source. The role of adding solid fuel to the sintering material layer in the prior art is gradually replaced by the ignition of positive and negative electrode source or microwave heating source and the heat release of gas combustion, thereby realizing "low-carbon sintering" with less coke ratio, or even "carbon-free sintering" with zero coke ratio.

[0087] 2. The fuel gas sprayed in the present invention is hydrogen-rich fuel gas. After the traditional downward draft production mode is changed to the upward draft production mode, the upward movement of the hydrogen-rich fuel gas is consistent with the production demand, and the fuel gas escape rate is greatly reduced; and the participation of the hydrogen-rich fuel gas in the combustion can effectively reduce the multiple pollutants brought in by the coke combustion, and can more replace the role of adding solid fuel (coke) in the sintering material layer, thereby being more conducive to achieving low-carbon green sintering.

[0088] 3. The present invention sets a plurality of positive and negative electrode sources at different heights on both sides of the sintering machine trolley. The setting positions of the positive and negative electrode sources match the upward position of the combustion zone in the sintering material layer, that is, each positive and negative electrode source can generate a breakdown current and form an electric spark in the sintering material layer at the corresponding height position, so that it reaches the ignition point temperature of the gas. The present invention also adds conductive steel fibers and conductive grid plates to strengthen the conduction means. The conductive steel fibers mainly play the role of strengthening the conductivity of the material layer, and the conductive grid plates mainly play the role of strengthening the current conduction in the material layer.

[0089] 4. The present invention arranges a plurality of microwave heating sources at different heights on both sides of the sintering machine trolley. The arrangement position of the microwave heating source matches the upward position of the combustion zone in the sintering material layer, that is, each microwave heating source can heat the sintering material layer at the corresponding height position to reach the gas ignition point temperature.

[0090] 5. The present invention sets the gas injection system under the sintering machine trolley. The setting of the gas injection system is compatible with the upper exhaust mode. The gas is sucked into the sintering material layer and ignited at high temperature, contributing heat to the sintering reaction. The present invention also sets a free-moving microwave source on the side of the sintering machine trolley. The free-moving microwave source can adaptively adjust the position of the mobile microwave source, and then heat the sintering material layer at the corresponding position, so that the heat storage in the sintering material layer increases, thereby alleviating the condensation behavior of water vapor in the sintering material layer.

[0091] 6. The present invention has developed an adaptive control method that is compatible with a low-carbon sintering device. This method can ensure that the quality indicators of sintered ore are within a reasonable range, avoid overburning of sintered ore, over-raw sintered ore, excessive negative pressure in the material layer, etc. during the sintering process, thereby achieving the purpose of stable, smooth and high-quality production of the entire sintering production line.

[0092] 7. Green and clean production of sintering process can be realized: Since the present invention realizes "carbon-free" or "low-carbon" sintering, the dioxins and NO introduced by the solid carbon fuel are x Many pollutants such as CO x It can also achieve substantial emission reductions and realize low-carbon green sintering that meets the country's carbon peak and carbon neutrality goals.

[0093] In summary, by using the technology of the present invention, the defects of the existing technology can be effectively solved. Compared with the existing technology, it is more reliable, safe and stable, and economical and environmentally friendly. It can be foreseen that it has great development potential in the future market. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Figure 1 It is a structural schematic diagram of a solid fuel sintering device in the prior art;

[0095] Figure 2 It is a schematic structural diagram of a gas-solid two-phase fuel sintering device in the prior art;

[0096] Figure 3 It is a structural schematic diagram of a gas-solid-electricity three-phase composite heating type low-carbon sintering device of the present invention;

[0097] Figure 4 It is a side view of the gas-solid-electricity three-phase composite heating type low-carbon sintering device of the present invention;

[0098] Figure 5 It is a schematic diagram of the structure of the positive and negative electrode sources and the free-moving microwave source in the present invention;

[0099] Figure 6 It is a structural schematic diagram of the bottom fuel gas injection system of the present invention;

[0100] Figure 7 It is a schematic diagram of the structure of the conductive grid plate and the conductive steel fiber in the present invention;

[0101] Figure 8 A top view of the conductive grid plate of the present invention;

[0102] Fig. 9 This is a schematic structural diagram of a gas-solid microwave three-phase composite heating type low-carbon sintering device of the present invention;

[0103] Fig.10 It is a side view of the gas-solid microwave three-phase composite heating type low-carbon sintering device of the present invention;

[0104] Fig.11 It is a schematic diagram of the structure of the microwave heating source and the free-moving microwave source in the present invention;

[0105] Fig.12 is a schematic diagram of a control system in the present invention;

[0106] Fig.13 This is a flow chart of a gas-solid-electricity three-phase composite heating type low-carbon sintering method of the present invention;

[0107] Fig.14 The present invention provides a flow chart of a gas-solid microwave three-phase composite heating type low-carbon sintering method.

[0108] Reference numerals:

[0109] 1: sintering machine trolley; 2: bottom gas injection system; 201: bottom injection hood; 202: injection pipe; 203: reflection plate; 204: injection hole; 205: gas valve; 301: positive and negative electrode source; 301A: positive electrode; 301B: negative electrode; 302: microwave heating source; 4: exhaust bellows; 401 bellows branch pipe; 5: large flue; 6: sealing hood; 601: sealing device; 7: free-moving microwave source; 701: track; 702: mobile microwave source; 703: driving motor; 8: conductive grid plate; 9: conductive steel fiber; 10: pressure detection device; 11: detection device; 12: gas concentration detection device; K: control system. DETAILED DESCRIPTION

[0110] According to an embodiment of the present invention, a three-phase composite heating type low-carbon sintering device is provided.

[0111] A three-phase composite heating type low-carbon sintering device, the device comprises a sintering machine trolley 1, a bottom fuel gas injection system 2 and a heating source. The bottom fuel gas injection system 2 is arranged below the sintering machine trolley 1. Along the running direction of the sintering machine trolley 1, the heating source is arranged on the side of the sintering machine trolley 1.

[0112] In the present invention, the heating source is a positive and negative electrode source 301. The positive and negative electrode source 301 includes a positive electrode 301A and a negative electrode 301B. Along the running direction of the sintering machine trolley 1, the positive electrode 301A and the negative electrode 301B are respectively arranged on both sides of the sintering machine trolley 1.

[0113] In the present invention, the heating source is a microwave heating source 302. The microwave heating source 302 is arranged on both sides of the sintering machine trolley 1.

[0114] In the present invention, the device further comprises an exhaust air box 4 and a large flue 5. The exhaust air box 4 is arranged above the sintering machine trolley 1. The large flue 5 is arranged above the exhaust air box 4 and communicated with the exhaust air box 4.

[0115] Preferably, a sealing cover 6 is further provided between the sintering machine trolley 1 and the exhaust air box 4. The sealing cover 6 is located at the upper part of the sintering machine trolley 1 and is connected to the exhaust air box 4.

[0116] In the present invention, the bottom fuel gas injection system 2 includes a bottom fuel injection hood 201, a fuel injection pipe 202 and a reflector 203. The bottom fuel injection hood 201 is arranged below the sintering machine trolley 1 and connected to the bottom of the sintering machine trolley 1. The fuel injection pipe 202 and the reflector 203 are both arranged in the bottom fuel injection hood 201. The fuel injection pipe 202 is provided with a fuel injection hole 204. The reflector 203 is arranged below the fuel injection pipe 202. Preferably, the fuel injection pipe 202 is provided with a fuel gas valve 205.

[0117] Preferably, the jet hole 204 is disposed at the lower half of the jet pipe 202. Preferably, the jet hole 204 is disposed in a radial direction that deviates from the vertical direction. The reflector 203 is located on the jet extension line of the jet hole 204.

[0118] Preferably, the bottom fuel gas injection system 2 includes a plurality of injection pipes 202. A gap is left between two adjacent injection pipes 202. The reflection plate 203 is correspondingly arranged at the gap position between two adjacent injection pipes 202. The number of the injection pipes 202 is m, and the value of m is 2 to 50, preferably 3 to 20. The number of the reflection plates 203 is ≥ m+1.

[0119] In the present invention, the number of the positive and negative electrode sources 301 is multiple, and each positive and negative electrode source 301 includes a positive electrode 301A and a negative electrode 301B. Along the running direction of the sintering machine trolley 1, the positive electrodes 301A of each positive and negative electrode source 301 are sequentially arranged on the same side of the sintering machine trolley 1, and the setting height of each positive electrode 301A is successively increased, that is, the positive electrodes 301A of each positive and negative electrode source 301 form a positive electrode group arranged obliquely upward on the same side of the sintering machine trolley 1 as a whole. Preferably, the negative electrodes 301B of each positive and negative electrode source 301 are sequentially arranged on the other side of the sintering machine trolley 1. The negative electrodes 301B and the positive electrodes 301A on both sides of the sintering machine trolley 1 are symmetrically distributed in terms of quantity and setting position.

[0120] In the present invention, the number of the microwave heating sources 302 is multiple, and the multiple microwave heating sources 302 are respectively arranged on both sides of the sintering machine trolley 1. Along the running direction of the sintering machine trolley 1, the microwave heating sources 302 on the same side are arranged in sequence, and the setting heights of each microwave heating source 302 are increased in sequence, that is, the microwave heating sources 302 on the same side form a microwave heating source group arranged obliquely upward as a whole. Preferably, the microwave heating sources 302 on both sides of the sintering machine trolley 1 are symmetrically distributed in number and setting positions.

[0121] In the present invention, the device further comprises a free-moving microwave source 7. The free-moving microwave source 7 comprises a track 701, a mobile microwave source 702, and a driving motor 703. The track 701 is arranged on the side of the sintering machine trolley 1. The mobile microwave source 702 is arranged on the track 701. The driving motor 703 is connected to the mobile microwave source 702, and drives the mobile microwave source 702 to perform free horizontal movement along the track 701. Preferably, the free-moving microwave source 7 is symmetrically arranged on both sides of the sintering machine trolley 1.

[0122] Preferably, the device further comprises a conductive grid plate 8 arranged in the sintering machine trolley 1. Preferably, the number of the conductive grid plates 8 is multiple. The multiple conductive grid plates 8 are arranged in rows in sequence along the width direction of the sintering machine trolley 1. Further preferably, the multiple conductive grid plates 8 are arranged in rows in sequence along the running direction of the sintering machine trolley 1. Two adjacent rows of conductive grid plates 8 are arranged in an alternating manner, and the conductive grid plates 8 in the latter row correspond to the gap between the two adjacent conductive grid plates 8 in the former row of conductive grid plates 8.

[0123] Preferably, the sintering mixture on the sintering machine trolley 1 is further provided with a plurality of evenly distributed conductive steel fibers 9. Preferably, the conductive steel fibers 9 are in the shape of thin strips. The size of the conductive steel fibers 9 is 1 to 10 mm, preferably 3 to 8 mm. Preferably, the spacing between two adjacent conductive grid plates 8 is 300 to 1200 mm, preferably 500 to 1000 mm.

[0124] Preferably, in each row of the conductive grid plates 8, the spacing between each two adjacent conductive grid plates 8 is the same. Preferably, the spacing L between two adjacent conductive grid plates 8 satisfies the following relationship:

[0125]

[0126] Where: L is the distance between two adjacent conductive grid plates, mm. d is the average particle size of the sintered mixture, mm. γ is the total iron content in the sintered mixture. ω is the moisture content in the sintered mixture. β is the conductive steel fiber content in the sintered mixture. a, b, c, e are the spacing adjustment constants, a is 0.1-0.5, b is 0.1-0.5, c is 0.1-1, and e is 0-5.

[0127] In the present invention, n exhaust air boxes 4 are arranged above the sintering machine trolley 1, and the value of n is 18 to 39, preferably 21 to 36, and more preferably 24 to 30. Each exhaust air box 4 is connected to the large flue 5 through its own wind box branch pipe 401. Preferably, each exhaust air box 4 is provided with a pressure detection device 10.

[0128] In the present invention, a sealing device 601 is provided at the connection position between the sealing cover 6 and the sintering machine trolley 1. Preferably, the sealing device 601 is a liquid sealing device.

[0129] Preferably, the device further comprises a detection device 11 arranged on the sintering machine trolley 1. The detection device 11 extends into the sintered ore belt in the sintering material layer. Preferably, the device further comprises a gas concentration detection device 12 arranged on the sealing cover 6. The gas concentration detection device 12 extends into the sealing cover 6.

[0130] Preferably, the device further comprises a control system K. The control system K is connected to the detection device 11, the pressure detection device 10, the gas concentration detection device 12, the gas valve 205 of the bottom gas injection system 2, the positive and negative electrode source 301, the microwave heating source 302, the mobile microwave source 702 of the free-moving microwave source 7, and the driving motor 703, and controls the operation of the detection device 11, the pressure detection device 10, the gas concentration detection device 12, the gas valve 205, the positive and negative electrode source 301, the microwave heating source 302, the mobile microwave source 702, and the driving motor 703.

[0131] Example A1

[0132] like Figure 3 As shown, a gas-solid-electric three-phase composite heating type low-carbon sintering device includes a sintering machine trolley 1, a bottom gas injection system 2 and a positive and negative electrode source 301. The bottom gas injection system 2 is arranged below the sintering machine trolley 1. The positive and negative electrode source 301 includes a positive electrode 301A and a negative electrode 301B. Along the running direction of the sintering machine trolley 1, the positive electrode 301A and the negative electrode 301B are respectively arranged on both sides of the sintering machine trolley 1.

[0133] Example A2

[0134] The embodiment A1 is repeated, except that the device further comprises an exhaust air box 4 and a large flue 5. The exhaust air box 4 is arranged above the sintering machine trolley 1. The large flue 5 is arranged above the exhaust air box 4 and communicates with the exhaust air box 3.

[0135] Example A3

[0136] The embodiment A2 is repeated, except that a sealing cover 6 is further provided between the sintering machine trolley 1 and the exhaust air box 4. The sealing cover 6 is located on the upper part of the sintering machine trolley 1 and is connected to the exhaust air box 4.

[0137] Example A4

[0138] like Figure 6As shown, the embodiment A3 is repeated, except that the bottom fuel gas injection system 2 includes a bottom fuel injection hood 201, a fuel injection pipe 202 and a reflector 203. The bottom fuel injection hood 201 is arranged below the sintering machine trolley 1 and connected to the bottom of the sintering machine trolley 1. The fuel injection pipe 202 and the reflector 203 are both arranged in the bottom fuel injection hood 201. The fuel injection pipe 202 is provided with a fuel injection hole 204. The reflector 203 is arranged below the fuel injection pipe 202. The fuel injection pipe 202 is provided with a fuel gas valve 205.

[0139] Example A5

[0140] The embodiment A4 is repeated, except that the jet hole 204 is arranged at the lower half of the jet pipe 202. The radial direction of the jet hole 204 is arranged to deviate from the vertical direction. The reflector 203 is located on the jet extension line of the jet hole 204.

[0141] Example A6

[0142] The embodiment A5 is repeated, except that the bottom fuel gas injection system 2 includes 12 injection pipes 202. A gap is left between two adjacent injection pipes 202.

[0143] Example A7

[0144] Embodiment A6 is repeated, except that the reflection plates 203 are disposed at the gap positions between two adjacent air jet pipes 202 , that is, the number of the reflection plates 203 is 13.

[0145] Example A8

[0146] The embodiment A7 is repeated, except that the number of the air injection pipes 202 is 18. The number of the reflective plates 203 is 19.

[0147] Embodiment A9

[0148] like Figure 4 As shown, Example A7 is repeated, except that the number of the positive and negative electrode sources 301 is multiple, and each positive and negative electrode source 301 includes a positive electrode 301A and a negative electrode 301B. Along the running direction of the sintering machine trolley 1, the positive electrodes 301A of each positive and negative electrode source 301 are sequentially arranged on the same side of the sintering machine trolley 1, and the setting height of each positive electrode 301A is successively increased, that is, the positive electrodes 301A of each positive and negative electrode source 301 form a positive electrode group that is inclined upward on the same side of the sintering machine trolley 1 as a whole. The negative electrodes 301B of each positive and negative electrode source 301 are sequentially arranged on the other side of the sintering machine trolley 1. The negative electrodes 301B and the positive electrodes 301A on both sides of the sintering machine trolley 1 are symmetrically distributed in terms of quantity and setting position.

[0149] Embodiment A10

[0150] like Figure 5 As shown, Example A9 is repeated, except that the device further includes a free-moving microwave source 7. The free-moving microwave source 7 includes a track 701, a mobile microwave source 702, and a driving motor 703. The track 701 is arranged on the side of the sintering machine trolley 1. The mobile microwave source 702 is arranged on the track 701. The driving motor 703 is connected to the mobile microwave source 702, and drives the mobile microwave source 702 to move freely horizontally along the track 701. The free-moving microwave sources 7 are symmetrically arranged on both sides of the sintering machine trolley 1.

[0151] Embodiment A11

[0152] like Figure 7 As shown, the embodiment A10 is repeated, except that the device further comprises a conductive grid plate 8 arranged in the sintering machine trolley 1. The number of the conductive grid plates 8 is multiple. The multiple conductive grid plates 8 are arranged in rows in sequence along the width direction of the sintering machine trolley 1.

[0153] Example A12

[0154] like Figure 8 As shown, the embodiment A11 is repeated, except that the plurality of conductive grid plates 8 are sequentially arranged in a plurality of rows along the running direction of the sintering machine trolley 1. Two adjacent rows of conductive grid plates 8 are arranged alternately, and the conductive grid plates 8 of the latter row are arranged corresponding to the gap between the two adjacent conductive grid plates 8 of the former row.

[0155] Embodiment A13

[0156] The embodiment A12 is repeated, except that a plurality of evenly distributed conductive steel fibers 9 are further provided in the sintering mixture on the sintering machine carriage 1. The conductive steel fibers 9 are in the shape of thin strips.

[0157] Embodiment A14

[0158] Example A13 was repeated except that the size of the conductive steel fibers 9 was 4-5 mm and the spacing between two adjacent conductive grid plates 8 was 500 mm.

[0159] Embodiment A15

[0160] Example A13 was repeated, except that the size of the conductive steel fibers 9 was 5-6 mm. The spacing between two adjacent conductive grid plates 8 was 800 mm.

[0161] Embodiment A16

[0162] Example A13 was repeated except that the size of the conductive steel fibers 9 was 6-7 mm and the spacing between two adjacent conductive grid plates 8 was 100 mm.

[0163] Embodiment A17

[0164] The embodiment A14 is repeated, except that in each row of the conductive grid plates 8, the spacing between each two adjacent conductive grid plates 8 is the same. The spacing L between the two adjacent conductive grid plates 8 satisfies the following relationship:

[0165]

[0166] Where: L is the distance between two adjacent conductive grid plates, mm. d is the average particle size of the sintered mixture, mm. γ is the total iron content in the sintered mixture. ω is the moisture content in the sintered mixture. β is the conductive steel fiber content in the sintered mixture. a, b, c, e are the spacing adjustment constants, a=0.2, b=0.3, c=0.5, e=2.

[0167] Embodiment A18

[0168] The embodiment A17 is repeated, except that 28 exhaust air boxes 4 are arranged above the sintering machine trolley 1. Each exhaust air box 4 is connected to the large flue 5 through its own wind box branch pipe 401.

[0169] Embodiment A19

[0170] Embodiment A18 is repeated, except that each exhaust bellows 4 is provided with a pressure detection device 10.

[0171] Example A20

[0172] The embodiment A19 is repeated, except that a sealing device 601 is provided at the connection position between the sealing cover 6 and the sintering machine trolley 1. The sealing device 601 is a liquid sealing device.

[0173] Example A21

[0174] The embodiment A20 is repeated, except that the device further comprises a detection device 11 arranged on the sintering machine carriage 1. The detection device 11 extends into the sintered ore zone in the sintering material layer.

[0175] Example A22

[0176] The embodiment A21 is repeated, except that the device further comprises a gas concentration detection device 12 disposed on the sealing cover 6. The gas concentration detection device 12 extends into the sealing cover 6.

[0177] Example A23

[0178] Embodiment A22 is repeated, except that the device further comprises a control system K. The control system K is connected to the detection device 11, the pressure detection device 10, the gas concentration detection device 12, the gas valve 205 of the bottom gas injection system 2, the positive and negative electrode sources 301, the mobile microwave source 702 of the free-moving microwave source 7, and the driving motor 703, and controls the operation of the detection device 11, the pressure detection device 10, the gas concentration detection device 12, the gas valve 205, the positive and negative electrode sources 301, the mobile microwave source 702, and the driving motor 703.

[0179] Example A24

[0180] like Fig.13 As shown, a gas-solid-electric three-phase composite heating type low-carbon sintering method, using the device in Example A23, the method comprises the following steps:

[0181] 1) Place the sintering mixture on the sintering machine trolley 1, turn on the positive and negative electrode sources 301, ignite and operate, and at the same time open the gas valve 205 of the bottom gas injection system 2.

[0182] 2) The control system K monitors the porosity of the sintered ore in real time through the detection device 11. During the real-time monitoring process, the control system K compares the detected real-time sintered ore porosity Z with the target sintered ore porosity Z0. The target sintered ore porosity Z0 = 13%.

[0183] The detection device 11 detects that the real-time sinter porosity Z = 13%. Obviously, the real-time sinter porosity Z = the target sinter porosity Z0, that is, the sinter quality index is within the normal range at this time, and the device continues to operate.

[0184] Embodiment A25

[0185] Example A24 is repeated, except that the detection device 11 detects the real-time sintered ore porosity Z=9%. Obviously, the real-time sintered ore porosity Z<the target sintered ore porosity Z0, and it is determined that the sintered ore is overburned. The control system K controls the gas valve 205 to reduce Z=Z0.

[0186] Example A26

[0187] Example A24 is repeated, except that the detection device 11 detects the real-time sintered ore porosity Z = 38%. Obviously, the real-time sintered ore porosity Z> the target sintered ore porosity Z0, and it is determined that the sintered ore is over-sintered at this time. The control system K detects the real-time gas concentration C = 3.5% in the sintering machine trolley 1 through the gas concentration detection device 12. Since the lower explosion limit concentration C max =5%, that is, the real-time gas concentration C < the lower limit of gas explosion concentration C maxAt this time, the control system K controls the gas valve 205 to increase so that Z=Z0.

[0188] Example A27

[0189] Example A26 is repeated, except that the control system K detects the real-time gas concentration C=5% in the sintering machine trolley 1 through the gas concentration detection device 12, that is, the real-time gas concentration C=the lower explosion limit concentration C of the gas. max At this time, the control system K controls to increase the solid fuel ratio in the sintering mixture so that Z=Z0.

[0190] Example A28

[0191] Repeat Example A24, except that the method further comprises:

[0192] 3) The control system K monitors the negative pressure of each exhaust bellows 4 in real time through the pressure detection device 10 arranged on each exhaust bellows 4.

[0193] The pressure detection device 10 detects that the real-time negative pressure P of a certain exhaust bellows 4 is 22000Pa. Since the target negative pressure P0 is 13000Pa, that is, the real-time negative pressure P of the exhaust bellows 4 is greater than the target negative pressure P0, it is determined that the negative pressure of the sintering material layer is too high.

[0194] The control system K determines the exhaust bellows 4 corresponding to the position where the negative pressure of the sintering material layer is too large through the pressure detection device 10, and then controls the driving motor 703 to move the mobile microwave source 702 of the free-moving microwave source 7 to the corresponding position of the exhaust bellows 4, and turns on the mobile microwave source 702 to heat the sintering material layer at this position, so that P=P0.

[0195] Example A29

[0196] Repeat Example A24, except that step 1) also includes the step of adding conductive steel fiber 9, specifically: before the sintering mixture is distributed to the sintering machine trolley 1, the conductive steel fiber 9 is added during the second mixing process of the sintering mixture, and the conductive steel fiber 9 is evenly mixed with the sintering mixture to obtain the sintering mixture.

[0197] Embodiment A30

[0198] Example A29 is repeated, except that the fuel gas injected by the bottom fuel gas injection system 2 is hydrogen-rich fuel gas, in which the volume proportion of hydrogen in the hydrogen-rich fuel gas is greater than 60%.

[0199] Example B1

[0200] like Fig. 9As shown, a gas-solid microwave three-phase composite heating type low-carbon sintering device includes a sintering machine trolley 1, a bottom gas injection system 2 and a microwave heating source 302. The bottom gas injection system 2 is arranged below the sintering machine trolley 1. Along the running direction of the sintering machine trolley 1, the microwave heating source 302 is arranged on the side of the sintering machine trolley 1.

[0201] Example B2

[0202] The embodiment B1 is repeated, except that the device further comprises an exhaust air box 4 and a large flue 5. The exhaust air box 4 is arranged above the sintering machine trolley 1. The large flue 5 is arranged above the exhaust air box 4 and communicates with the exhaust air box 3.

[0203] Example B3

[0204] The embodiment B2 is repeated, except that a sealing cover 6 is further provided between the sintering machine trolley 1 and the exhaust air box 4. The sealing cover 6 is located on the upper part of the sintering machine trolley 1 and is connected to the exhaust air box 4.

[0205] Example B4

[0206] like Figure 6 As shown, the embodiment B3 is repeated, except that the bottom fuel gas injection system 2 includes a bottom fuel injection hood 201, a fuel injection pipe 202 and a reflector 203. The bottom fuel injection hood 201 is arranged below the sintering machine trolley 1 and connected to the bottom of the sintering machine trolley 1. The fuel injection pipe 202 and the reflector 203 are both arranged in the bottom fuel injection hood 201. The fuel injection pipe 202 is provided with a fuel injection hole 204. The reflector 203 is arranged below the fuel injection pipe 202. The fuel injection pipe 202 is provided with a fuel gas valve 205.

[0207] Example B5

[0208] The embodiment B4 is repeated, except that the jet hole 204 is arranged at the lower half of the jet pipe 202. The radial direction of the jet hole 204 is arranged to deviate from the vertical direction. The reflector 203 is located on the jet extension line of the jet hole 204.

[0209] Example B6

[0210] The embodiment B5 is repeated, except that the bottom fuel gas injection system 2 includes 12 injection pipes 202. A gap is left between two adjacent injection pipes 202.

[0211] Example B7

[0212] Embodiment B6 is repeated, except that the reflecting plates 203 are disposed at the gap positions between two adjacent air jet pipes 202 , that is, the number of reflecting plates 203 is 13.

[0213] Example B8

[0214] The embodiment B7 is repeated, except that the number of the air injection pipes 202 is 20. The number of the reflective plates 203 is 21.

[0215] Example B9

[0216] like Fig.10 As shown, Example B7 is repeated, except that the number of the microwave heating sources 302 is multiple, and the multiple microwave heating sources 302 are respectively arranged on both sides of the sintering machine trolley 1. Along the running direction of the sintering machine trolley 1, the microwave heating sources 302 on the same side are arranged in sequence, and the setting heights of each microwave heating source 302 are increased in sequence, that is, the microwave heating sources 302 on the same side form a microwave heating source group arranged obliquely upward as a whole. The microwave heating sources 302 on both sides of the sintering machine trolley 1 are symmetrically distributed in number and setting positions.

[0217] Example B10

[0218] like Fig.11 As shown, Example B9 is repeated, except that the device further includes a free-moving microwave source 7. The free-moving microwave source 7 includes a track 701, a mobile microwave source 702, and a driving motor 703. The track 701 is arranged on the side of the sintering machine trolley 1. The mobile microwave source 702 is arranged on the track 701. The driving motor 703 is connected to the mobile microwave source 702, and drives the mobile microwave source 702 to move freely horizontally along the track 701. The free-moving microwave sources 7 are symmetrically arranged on both sides of the sintering machine trolley 1.

[0219] Example B11

[0220] The embodiment B10 is repeated, except that 26 exhaust air boxes 4 are arranged above the sintering machine carriage 1. Each exhaust air box 4 is connected to the large flue 5 through its own wind box branch pipe 401.

[0221] Example B12

[0222] Embodiment B11 is repeated, except that each exhaust bellows 4 is provided with a pressure detection device 8 .

[0223] Example B13

[0224] The embodiment B12 is repeated, except that a sealing device 601 is provided at the connection position between the sealing cover 6 and the sintering machine trolley 1. The sealing device 601 is a liquid sealing device.

[0225] Example B14

[0226] The embodiment B13 is repeated, except that the device further comprises a detection device 9 arranged on the sintering machine carriage 1. The detection device 9 extends into the sintered ore zone in the sintering material layer.

[0227] Example B15

[0228] The embodiment B14 is repeated, except that the device further comprises a gas concentration detection device 10 disposed on the sealing cover 6. The gas concentration detection device 10 extends into the sealing cover 6.

[0229] Example B16

[0230] Example B15 is repeated, except that the device further includes a control system K. The control system K is connected to the detection device 9, the pressure detection device 8, the gas concentration detection device 10, the gas valve 205 of the bottom gas injection system 2, the microwave heating source 302, the mobile microwave source 702 of the free-moving microwave source 7, and the driving motor 703, and controls the operation of the detection device 9, the pressure detection device 8, the gas concentration detection device 10, the gas valve 205, the microwave heating source 302, the mobile microwave source 702, and the driving motor 703.

[0231] Example B17

[0232] like Fig.14 As shown, a gas-solid microwave three-phase composite heating type low-carbon sintering method, using the device in Example B16, the method comprises the following steps:

[0233] 1) Place the sintering mixture on the sintering machine trolley 1, turn on the microwave heating source 302, ignite and operate, and at the same time open the gas valve 205 of the bottom gas injection system 2.

[0234] 2) The control system K monitors the porosity of the sintered ore in real time through the detection device 9. During the real-time monitoring process, the control system K compares the detected real-time sintered ore porosity Z with the target sintered ore porosity Z0. The target sintered ore porosity Z0 = 15%.

[0235] The detection device 9 detects that the real-time sinter porosity Z = 15%. Obviously, the real-time sinter porosity Z = the target sinter porosity Z0, that is, the sinter quality index is within the normal range at this time, and the device continues to operate.

[0236] Example B18

[0237] Example B17 is repeated, except that the detection device 9 detects the real-time sintered ore porosity Z=8%. Obviously, the real-time sintered ore porosity Z<the target sintered ore porosity Z0, and it is determined that the sintered ore is overburned. The control system K controls the gas valve 205 to reduce Z=Z0.

[0238] Example B19

[0239] Example B18 is repeated, except that the control system K controls the microwave power of the microwave heating source 302 to be reduced so that Z=Z0.

[0240] Example B20

[0241] Example B17 is repeated, except that the detection device 9 detects the real-time sintered ore porosity Z = 40%. Obviously, the real-time sintered ore porosity Z> the target sintered ore porosity Z0, and it is determined that the sintered ore is over-sintered at this time. The control system K detects the real-time gas concentration C = 3.2% in the sintering machine trolley 1 through the gas concentration detection device 10. Since the lower explosion limit concentration C max =4%, that is, the real-time gas concentration C < the lower explosion limit concentration C max At this time, the control system K controls the gas valve 205 to increase so that Z=Z0.

[0242] Example B21

[0243] Example B20 is repeated, except that the control system K detects the real-time gas concentration C=4% in the sintering machine trolley 1 through the gas concentration detection device 10, that is, the real-time gas concentration C=the lower explosion limit concentration C of the gas. max At this time, the control system K controls to increase the microwave power of the microwave heating source 302 so that Z=Z0.

[0244] Example B22

[0245] Example B17 was repeated except that the method further included:

[0246] 3) The control system K monitors the negative pressure of each exhaust bellows 4 in real time through the pressure detection device 8 arranged on each exhaust bellows 4 .

[0247] The pressure detection device 8 detects that the real-time negative pressure P of a certain exhaust bellows 4 is 21000Pa. Since the target negative pressure P0 is 15000Pa, that is, the real-time negative pressure P of the exhaust bellows 4 is greater than the target negative pressure P0, it is determined that the negative pressure of the sintering material layer is too high.

[0248] The control system K determines the exhaust bellows 4 corresponding to the position where the negative pressure of the sintering material layer is too large through the pressure detection device 8, and then controls the driving motor 703 to move the mobile microwave source 702 of the free-moving microwave source 7 to the corresponding position of the exhaust bellows 4, and turns on the mobile microwave source 702 to heat the sintering material layer at this position, so that P=P0.

[0249] Example B23

[0250] Example B17 is repeated, except that the fuel gas injected by the bottom fuel gas injection system 2 is hydrogen-rich fuel gas, in which the volume proportion of hydrogen in the hydrogen-rich fuel gas is greater than 60%.

Claims

1. A three-phase composite heating type low-carbon sintering device, characterized in that: The device comprises a sintering machine trolley (1), a bottom fuel gas injection system (2) and a heating source; the bottom fuel gas injection system (2) is arranged below the sintering machine trolley (1); along the running direction of the sintering machine trolley (1), the heating source is arranged on the side of the sintering machine trolley (1); The bottom fuel gas injection system (2) comprises a bottom injection hood (201), an injection pipe (202) and a reflection plate (203); the bottom injection hood (201) is arranged below the sintering machine trolley (1) and connected to the bottom of the sintering machine trolley (1); the injection pipe (202) and the reflection plate (203) are both arranged in the bottom injection hood (201); the injection pipe (202) is provided with an injection hole (204); and the reflection plate (203) is arranged below the injection pipe (202).

2. The low carbon sintering device according to claim 1, characterized in that: The heating source is a positive and negative electrode source (301); the positive and negative electrode source (301) comprises a positive electrode (301A) and a negative electrode (301B); along the running direction of the sintering machine trolley (1), the positive electrode (301A) and the negative electrode (301B) are respectively arranged on both sides of the sintering machine trolley (1); or The heating source is a microwave heating source (302); the microwave heating source (302) is arranged on both sides of the sintering machine trolley (1).

3. The low carbon sintering device according to claim 1 or 2, characterized in that: The device further comprises an exhaust bellows (4) and a large flue (5); the exhaust bellows (4) is arranged above the sintering machine trolley (1); and the large flue (5) is arranged above the exhaust bellows (4) and is in communication with the exhaust bellows (4).

4. The low carbon sintering device according to claim 3, characterized in that: A sealing cover (6) is also provided between the sintering machine trolley (1) and the exhaust bellows (4); the sealing cover (6) is located on the upper part of the sintering machine trolley (1) and is connected to the exhaust bellows (4).

5. The low carbon sintering device according to any one of claims 1, 2 and 4, characterized in that: The gas injection pipe (202) is provided with a gas valve (205).

6. The low carbon sintering device according to claim 3, characterized in that: The gas injection pipe (202) is provided with a gas valve (205).

7. The low carbon sintering device according to any one of claims 1, 2, 4 and 6, characterized in that: The air injection hole (204) is arranged at the lower half of the air injection pipe (202).

8. The low carbon sintering device according to claim 3, characterized in that: The air injection hole (204) is arranged at the lower half of the air injection pipe (202).

9. The low carbon sintering device according to claim 7, characterized in that: The radial direction where the jet hole (204) is located deviates from the vertical direction; and the reflection plate (203) is located on the jet extension line of the jet hole (204).

10. The low carbon sintering device according to claim 8, characterized in that: The radial direction where the jet hole (204) is located deviates from the vertical direction; and the reflection plate (203) is located on the jet extension line of the jet hole (204).

11. The low carbon sintering device according to any one of claims 1, 2, 4, 6, 8-10, characterized in that: The bottom fuel gas injection system (2) comprises a plurality of injection pipes (202); a gap is left between two adjacent injection pipes (202); and the reflection plate (203) is correspondingly arranged at the gap position between the two adjacent injection pipes (202).

12. The low carbon sintering device according to claim 3, characterized in that: The bottom fuel gas injection system (2) comprises a plurality of injection pipes (202); a gap is left between two adjacent injection pipes (202); and the reflection plate (203) is correspondingly arranged at the gap position between the two adjacent injection pipes (202).

13. The low carbon sintering device according to claim 11, characterized in that: The number of the air jet pipes (202) is m, where the value of m is 2 to 50; the number of the reflection plates (203) is ≥ m+1.

14. The low carbon sintering device according to claim 12, characterized in that: The number of the air jet pipes (202) is m, where the value of m is 2 to 50; the number of the reflection plates (203) is ≥ m+1.

15. The low carbon sintering device according to claim 13 or 14, characterized in that: The value of m is 3~20.

16. The low carbon sintering device according to claim 2, characterized in that: There are multiple positive and negative electrode sources (301), and each positive and negative electrode source (301) comprises a positive electrode (301A) and a negative electrode (301B).

17. The low carbon sintering device according to claim 16, characterized in that: Along the running direction of the sintering machine trolley (1), the positive electrodes (301A) of the positive and negative electrode sources (301) are arranged in sequence on the same side of the sintering machine trolley (1); and the arrangement heights of the positive electrodes (301A) are increased in sequence, that is, the positive electrodes (301A) of the positive and negative electrode sources (301) form a positive electrode group arranged upwardly and tilted as a whole on the same side of the sintering machine trolley (1); the negative electrodes (301B) of the positive and negative electrode sources (301) are arranged in sequence on the other side of the sintering machine trolley (1); and the negative electrodes (301B) and the positive electrodes (301A) on both sides of the sintering machine trolley (1) are symmetrically distributed in terms of number and arrangement position.

18. The low carbon sintering device according to claim 2, characterized in that: There are multiple microwave heating sources (302), and the multiple microwave heating sources (302) are respectively arranged on both sides of the sintering machine trolley (1).

19. The low carbon sintering device according to claim 18, characterized in that: Along the running direction of the sintering machine trolley (1), the microwave heating sources (302) on the same side are arranged in sequence, and the arrangement heights of the microwave heating sources (302) are increased in sequence, that is, the microwave heating sources (302) on the same side form a microwave heating source group that is arranged obliquely upward as a whole.

20. The low carbon sintering device according to claim 18 or 19, characterized in that: The microwave heating sources (302) on both sides of the sintering machine trolley (1) are symmetrically distributed in terms of number and arrangement positions.

21. The low carbon sintering device according to any one of claims 1, 2, 4, 6, 8-10, 12-14, 16-19, characterized in that: The device also includes a freely movable microwave source (7); the freely movable microwave source (7) includes a track (701), a movable microwave source (702), and a driving motor (703); wherein the track (701) is arranged on the side of the sintering machine trolley (1); the movable microwave source (702) is arranged on the track (701); and the driving motor (703) is connected to the movable microwave source (702) and drives the movable microwave source (702) to perform free horizontal movement along the track (701).

22. The low carbon sintering device according to claim 3, characterized in that: The device also includes a freely movable microwave source (7); the freely movable microwave source (7) includes a track (701), a movable microwave source (702), and a driving motor (703); wherein the track (701) is arranged on the side of the sintering machine trolley (1); the movable microwave source (702) is arranged on the track (701); and the driving motor (703) is connected to the movable microwave source (702) and drives the movable microwave source (702) to perform free horizontal movement along the track (701).

23. The low carbon sintering device according to claim 21, characterized in that: The freely movable microwave sources (7) are symmetrically arranged on both sides of the sintering machine trolley (1).

24. The low carbon sintering device according to claim 22, characterized in that: The freely movable microwave sources (7) are symmetrically arranged on both sides of the sintering machine trolley (1).

25. The low carbon sintering device according to any one of claims 2 and 16-19, characterized in that: The device also includes a conductive grid plate (8) arranged in the sintering machine trolley (1).

26. The low carbon sintering device according to claim 25, characterized in that: The number of the conductive grid plates (8) is multiple; the multiple conductive grid plates (8) are arranged in rows in sequence along the width direction of the sintering machine trolley (1).

27. The low carbon sintering device according to claim 26, characterized in that: The plurality of conductive grid plates (8) are arranged in a plurality of rows in sequence along the running direction of the sintering machine trolley (1); Two adjacent rows of conductive grid plates (8) are arranged in a staggered manner, and the conductive grid plates (8) of the rear row are arranged corresponding to the gap between two adjacent conductive grid plates (8) in the front row of conductive grid plates (8).

28. The low carbon sintering device according to claim 26, characterized in that: The distance between two adjacent conductive grid plates (8) is 500-1000 mm.

29. The low carbon sintering device according to claim 28, characterized in that: The distance between two adjacent conductive grid plates (8) is 500-1000 mm.

30. The low carbon sintering device according to any one of claims 2 and 16-19, characterized in that: A plurality of evenly distributed conductive steel fibers (9) are also provided in the sintering mixture on the sintering machine trolley (1).

31. The low carbon sintering device according to claim 30, characterized in that: A plurality of evenly distributed conductive steel fibers (9) are also provided in the sintering mixture on the sintering machine trolley (1).

32. The low carbon sintering device according to claim 30, characterized in that: The conductive steel fibers (9) are in the form of thin strips.

33. The low carbon sintering device according to claim 31, characterized in that: The conductive steel fibers (9) are in the form of thin strips.

34. The low carbon sintering device according to claim 32 or 33, characterized in that: The size of the conductive steel fiber (9) is 1-10 mm.

35. The low carbon sintering device according to claim 34, characterized in that: The size of the conductive steel fiber (9) is 3-8 mm.

36. The low carbon sintering device according to any one of claims 26 to 29, characterized in that: In each row of the conductive grid plates (8), the distance between each two adjacent conductive grid plates (8) is the same.

37. The low carbon sintering device according to claim 36, characterized in that: The distance L between two adjacent conductive grid plates (8) satisfies the following relationship: ， In the formula: L is the distance between two adjacent conductive grid plates, mm; d is the average particle size of the sintered mixture, mm; γ is the total iron content in the sintered mixture; ω is the moisture content in the sintered mixture; β is the conductive steel fiber content in the sintered mixture; a, b, c, and e are distance adjustment constants, the value of a is 0.1-0.5, the value of b is 0.1-0.5, the value of c is 0.1-1, and the value of e is 0-5.

38. The low carbon sintering device according to claim 4, characterized in that: n exhaust air bellows (4) are arranged above the sintering machine trolley (1), and the value of n is 18 to 39; each exhaust air bellows (4) is connected to the large flue (5) through its own bellows branch pipe (401); and / or A sealing device (601) is provided at the connection position between the sealing cover (6) and the sintering machine trolley (1).

39. The low carbon sintering device according to claim 38, characterized in that: The value of n is 21~36.

40. The low carbon sintering device according to claim 39, characterized in that: The value of n is 24~30.

41. The low carbon sintering device according to claim 38, characterized in that: Each exhaust bellows (4) is provided with a pressure detection device (10); and / or The sealing device (601) is a liquid sealing device.

42. The low carbon sintering device according to claim 39, characterized in that: The device also comprises a detection device (11) arranged on the sintering machine trolley (1); the detection device (11) extends into the sintering ore belt in the sintering material layer.

43. The low carbon sintering device according to claim 42, characterized in that: The device further comprises a gas concentration detection device (12) arranged on the sealing cover (6); the gas concentration detection device (12) extends into the sealing cover (6).

44. The low carbon sintering device according to claim 43, characterized in that: The device further comprises a control system (K); the control system (K) is connected to the detection device (11), the pressure detection device (10), the gas concentration detection device (12), the gas valve (205) of the bottom gas injection system (2), the positive and negative electrode sources (301), the microwave heating source (302), the mobile microwave source (702) of the free-moving microwave source (7), and the driving motor (703), and controls the operation of the detection device (11), the pressure detection device (10), the gas concentration detection device (12), the gas valve (205), the positive and negative electrode sources (301), the microwave heating source (302), the mobile microwave source (702), and the driving motor (703).

45. A method for low carbon sintering using the device according to any one of claims 1 to 44, the method comprising the following steps: 1) Placing the sintering mixture onto the sintering machine trolley (1), turning on the positive and negative electrode sources (301) or the microwave heating source (302), igniting and operating, and at the same time opening the gas valve (205) of the bottom gas injection system (2); 2) The device further comprises a control system (K); the control system (K) monitors the porosity of the sintered ore in real time through the detection device (11); during the real-time monitoring process, the control system (K) compares the detected real-time sintered ore porosity Z with the target sintered ore porosity Z0; 201) If the real-time sinter porosity Z = the target sinter porosity Z0, that is, the sinter quality index is within the normal range, the device continues to operate; 202) If the real-time sintered ore porosity Z is less than the target sintered ore porosity Z0, it is determined that the sintered ore is overburned at this time; the control system (K) controls the gas valve (205) to be reduced or the microwave power of the microwave heating source (302) to be reduced so that Z=Z0; 203) If the real-time sintered ore porosity Z>the target sintered ore porosity Z0, it is determined that the sintered ore is over-cooked; the control system (K) controls the gas valve (205) to increase, or increases the solid fuel ratio in the sintered mixture, or increases the microwave power of the microwave heating source (302), so that Z= Z0.

46. ​​The low carbon sintering method according to claim 45, characterized in that: The target sinter porosity Z0 has a value range of 10%-30%.

47. The low carbon sintering method according to claim 46, characterized in that: The target sinter porosity Z0 has a value range of 10%-20%.

48. The low carbon sintering method according to claim 47, characterized in that: The target sinter porosity Z0 has a value range of 10%-15%.

49. The low carbon sintering method according to claim 45, characterized in that: Step 1) also includes a step of adding conductive steel fibers (9), which specifically includes: before the sintering mixture is distributed to the sintering machine trolley (1), the conductive steel fibers (9) are added during the second mixing process of the sintering first mixture, and the conductive steel fibers (9) are evenly mixed with the sintering first mixture to obtain a sintering mixture.

50. The low carbon sintering method according to claim 45, characterized in that: The fuel gas injected by the bottom fuel gas injection system (2) is hydrogen-rich fuel gas.

51. The low carbon sintering method according to claim 50, characterized in that: The volume proportion of hydrogen in the hydrogen-rich fuel gas is greater than 50%.

52. The low carbon sintering method according to claim 51, characterized in that: The volume proportion of hydrogen in the hydrogen-rich fuel gas is greater than 60%.

53. The low carbon sintering method according to any one of claims 45 to 52, characterized in that: The method further includes: 3) The control system (K) monitors the negative pressure of each exhaust bellows (4) in real time through a pressure detection device (10) provided on each exhaust bellows (4); during the real-time monitoring process, once it is detected that the real-time negative pressure P of the exhaust bellows (4) is greater than the target negative pressure P0, it is determined that the negative pressure of the sintering material layer is too high; The control system (K) determines the exhaust bellows (4) corresponding to the position where the negative pressure of the sintering material layer is too large through the pressure detection device (10), and then controls the driving motor (703) to move the mobile microwave source (702) of the free movable microwave source (7) to the corresponding position of the exhaust bellows (4), and turns on the mobile microwave source (702) to heat the sintering material layer at this position, so that P=P0.

54. The low carbon sintering method according to claim 53, characterized in that: The target negative pressure P0 has a value range of 10000-20000Pa.

55. The low carbon sintering method according to claim 54, characterized in that: The target negative pressure P0 has a value range of 10000-18000Pa.

56. The low carbon sintering method according to claim 55, characterized in that: The target negative pressure P0 has a value range of 10000-15000Pa.

57. The low carbon sintering method according to any one of claims 45 to 52, characterized in that: The step 203) is specifically as follows: if the real-time sintered ore porosity Z>the target sintered ore porosity Z0, it is determined that the sintered ore is over-grown; the control system (K) detects the real-time gas concentration C in the sintering machine trolley (1) through the gas concentration detection device (12); If the real-time gas concentration C is less than the lower explosion limit concentration C max At this time, the control system (K) controls the gas valve (205) to increase so that Z = Z0; if the real-time gas concentration C ≥ the lower limit of gas explosion concentration C max At this time, the control system (K) controls to increase the solid fuel ratio in the sintering mixture or to increase the microwave power of the microwave heating source (302) so that Z= Z0.

58. The low carbon sintering method according to claim 57, characterized in that: The lower explosion limit concentration of the gas C max The value range is 4%-5%.

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