A sintering mixer dust removal method and system based on a double-layer screening belt

Abstract

A sintering mixer dust removal method based on a double-layer screening belt comprises the following steps: 1) sintering raw materials are screened through a double-layer belt (2) with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve; 2) the coarse particles on the sieve are transported to a primary mixer (1) via an upper belt (201) of the double-layer belt (2), and the fine particles under the sieve are transported to the primary mixer (1) via a lower belt (202) of the double-layer belt (2); 3) the coarse particles on the sieve and the fine particles under the sieve are mixed to obtain a sintered mixed material. The present invention transforms a traditional feed belt into a double-layer belt with screening, wherein the screened coarse particles are placed on the upper belt, and the fine particles fall onto the lower belt. The coarse particles and the fine particles are discharged to the primary mixer respectively, thereby presenting a material distribution situation in which the coarse particles are on the top and the fine particles are on the bottom, which can effectively suppress the generation of dust during the discharge process.

Description

Technical Field

[0001] The invention relates to a dust removal process for a sintering mixer, in particular to a dust removal method and system for a sintering mixer based on a double-layer screening belt, and belongs to the technical field of sintering process equipment. Background Art

[0002] The mixing process is one of the key steps in the sintering system. The mixing operation has two objectives: first, to thoroughly blend the various components of the batch material to produce sintered ore of relatively uniform quality; second, to moisten and granulate the material to produce a sintered mixture with an appropriate particle size and good air permeability. A two-stage mixing process involves sequentially applying the batch material to two different pieces of equipment. The primary mixing process primarily moistens and mixes the material to ensure uniform distribution of moisture, particle size, and components. It also serves to preheat the mixture when hot return ore is added. The secondary mixing process, in addition to continuing the mixing process, primarily involves granulation. Enhancing granulation during the mixing process allows fine particles to adhere to the core particles, forming pseudo-particles of a specific size. This improves the air permeability of the sintering bed and results in higher sintering productivity.

[0003] During the raw material batching stage, sintering typically involves smelting quicklime (CaO) with water. Water is then added, causing the calcium oxide to react with water to form calcium hydroxide, releasing a significant amount of heat. This process intensifies the sintering process, increases material temperature, and reduces over-wetting. The colloidal surface of smelted lime is highly absorbent and cohesive, improving the balling properties of the sintered mix. However, the smelting process also poses a significant risk of dust pollution in the primary mixer. This smelting process generates significant amounts of water vapor, which diffuses and carries with it a significant amount of dust, polluting the surrounding environment. The characteristics of dust are high humidity, high concentration, light specific gravity and fine particles. This part of the dust-laden gas is in a saturated state. Water vapor condenses into water in the pipe. The mixture of water and dust is in a colloidal state with strong adhesion, which can easily clog the dust removal pipe and cause adhesion to the dust removal equipment, affecting the normal operation of the dust removal system. In severe cases, the entire dust removal system can be paralyzed in a short time, causing dust-laden gas to overflow. The air is also filled with lime dust, which causes strong irritation to the human respiratory system. Over time, the surrounding areas are covered with white lime dust, which poses serious environmental hazards.

[0004] At present, in order to prevent pipeline blockage, the main method is to set water nozzles on the pipeline from the dust removal point to the inlet of the dust removal equipment to spray water along the way, so as to alleviate the blockage of the pipeline. However, the disadvantage of this method is that it consumes a lot of water and cannot completely avoid pipeline blockage. It is necessary to regularly clean the sediment at the low points or elbows of the pipeline.

[0005] In addition, the current choice of dust removal equipment is mainly wet dust collector or a combination of wet dust collector and wet electrostatic precipitator. The dust removal efficiency of wet dust collector is only 97% at most. If the emission of 20mg / m 3 According to the requirements, the dust collector inlet concentration requirement shall not be higher than 670mg / m 3 The actual dust collector inlet concentration is generally 8 to 15 g / m 3 , which is much higher than this value. Therefore, single-stage wet dust removal cannot guarantee emission requirements, and a two-stage wet dust collector or a wet dust collector and a wet electrostatic precipitator in series are required to ensure dust removal emission requirements. This configuration significantly increases equipment costs and site area. Existing dust removal technical solutions all belong to wet dust removal, and the system maintenance workload is large, and personnel are required to regularly clean the dust removal pipes. A large amount of sewage is generated during the operation of the wet dust removal system. The generated sewage is generally transported to the primary mixing station by a sewage pump. If the water balance of the process cannot be guaranteed, it will bring about sewage treatment problems, and this part of the sewage may cause secondary pollution. The dust removal efficiency of the wet dust collector used is not high, and it is difficult to meet the existing environmental protection emission requirements. Summary of the Invention

[0006] In response to the adverse effects of the quicklime digestion process on sintering primary mixing in the prior art, the present invention proposes a sintering mixer dust removal method and system based on a double-layer screening belt. The present invention transforms the traditional feed belt into a double-layer belt with screen holes. The screened coarse-grained material is placed on the upper belt, and the fine-grained material falls onto the lower belt. As a result, the coarse-grained material is discharged through the upper belt, and the fine-grained material is discharged through the lower belt. As a result, when the material is distributed to the primary mixer, the particle size distribution is such that the coarse-grained material is at the top and the fine-grained material is at the bottom. This effectively suppresses the generation of dust during the discharge process, greatly improving the dust pollution of the entire system.

[0007] According to a first embodiment of the present invention, a sintering mixer dust removal method based on a double-layer screening belt is provided.

[0008] A sintering mixer dust removal method based on a double-layer screening belt, the method comprising the following steps:

[0009] 1) The sintering raw materials are screened by a double-layer belt with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve.

[0010] 2) The coarse particles on the screen are transported to the primary mixer via the upper belt of the double belt, and the fine particles under the screen are transported to the primary mixer via the lower belt of the double belt.

[0011] 3) The coarse particles on the sieve and the fine particles under the sieve entering the primary mixer are mixed to obtain a sintering mixture.

[0012] Preferably, in step 2), the coarse particles on the upper belt are sprayed with water.

[0013] Preferably, in step 2), the undersized fine particles on the lower belt are subjected to water spraying treatment.

[0014] Preferably, in step 1), the sintering raw materials are subjected to water spraying treatment before being screened.

[0015] Preferably, in step 3), the material in the mixing process is sprayed with water.

[0016] In the present invention, the method further comprises:

[0017] 4) The dust-laden gas generated by the coarse-grained material on the screen and the fine-grained material under the screen in the process of feeding into the primary mixer enters the dust collector through the dust removal pipeline. The dust-laden gas is purified in the dust collector and then discharged to the chimney.

[0018] 5) During the dust removal process, the sintered raw material ash collected by the dust collector is returned to the double-layer belt.

[0019] In the present invention, the amount of coarse particles on the screen to be discharged per unit time is L1, kg / s. The amount of fine particles under the screen to be discharged per unit time is L2, kg / s. The upper limit of the dust concentration in the dust-laden gas entering the dust collector is set to C max , mg / m 3 . Calculate the total amount of water sprayed per unit time required to sinter the raw materials, M, mg.

[0020] Where: D is the average particle size of the sintered mixture, mm. k1 is the water injection correction coefficient, and the value of k1 is 1*10 9 ~5*10 9 , m. C max <1000 mg / m 3 , preferably C max <900 mg / m 3 , more preferably C max <800 mg / m 3 In the calculation process of this formula, the upper limit of dust concentration C in the dust-laden gas entering the dust collector max The logarithmic calculation of is only for numerical values, and its units do not participate in the logarithmic calculation. In unit time, the total water spraying amount for sintering raw materials is kept not less than M, so that the dust concentration at the gas inlet of the dust collector is lower than C max .

[0021] In the present invention, the initial total water injection rate for the sintering raw materials is set to M0, g / s. The actual moisture content W,% of the sintering mixture at the primary mixer outlet is detected. Based on the required sintering conditions, the target moisture content of the sintering mixture is set to W0,%. The difference between the actual moisture content W of the sintering mixture and the target moisture content W0 is determined, and the real-time total water injection rate M1, g / s for the sintering raw materials is adjusted. Specifically,

[0022] When W<W0, M1=[1+k2·(W0-W)]×M0.

[0023] When W=W0, M1=M0.

[0024] When W>W0, M1=[1-k3·(W-W0)]×M0.

[0025] Wherein: k2 and k3 are water spraying amount adjustment constants, k2 is 3 to 10, k3 is 1 to 8, W0 is ≤ 15%, preferably W0 is ≤ 12%, and more preferably W0 is ≤ 10%.

[0026] The actual moisture content W of the sintered mixed material is detected in real time, and the real-time total water spraying amount of the sintered raw material is adjusted to M1, so that the moisture content of the sintered mixed material at the discharge port of the primary mixer is W0.

[0027] Preferably, in step 4), the dust removal duct is a double-tube structure, and the dust-laden gas generated during the discharge of the coarse particles on the screen and the fine particles under the screen enters the dust collector through the inner chamber of the dust removal duct for treatment. At the same time, a heat medium is introduced into the outer chamber of the dust removal duct.

[0028] Preferably, the temperature of the heat medium is higher than the dew point temperature of the dust-laden gas. Preferably, the temperature of the heat medium is 100-300° C., preferably 120-280° C., and more preferably 150-250° C. The heat medium is hot air or hot water.

[0029] According to a second embodiment of the present invention, a sintering mixer dust removal system based on a double-layer screening belt is provided.

[0030] A sintering mixer dust removal system based on a double-layer screening belt, or a sintering mixer dust removal system used in the method described in the first embodiment, comprises a primary mixer and a double-layer belt. The double-layer belt comprises an upper belt and a lower belt. The discharge ends of the upper and lower belts both extend into the feed inlet of the primary mixer. The upper belt is positioned above the lower belt and is provided with screen holes.

[0031] In the present invention, the double-layer belt is a U-shaped screening belt. It comprises an upper belt disposed on the outer ring and a lower belt disposed on the inner ring. The discharge ends of the upper and lower belts both extend into the feed port of the primary mixer. The discharge end of the lower belt is also connected to a discharge channel. The discharge port of the discharge channel extends toward the bottom of the primary mixer.

[0032] Preferably, the system includes a first water spraying device. The first water spraying device is arranged above the upper belt.

[0033] Preferably, the system includes a second water spraying device. The second water spraying device is arranged on the side of the double-layer belt, and in the vertical direction, the second water spraying device is located above the lower belt, preferably between the lower belt and the upper belt.

[0034] Preferably, the system includes a third water spraying device. The third water spraying device is arranged above the feed end of the upper belt.

[0035] Preferably, the system includes a fourth water spraying device, which is arranged in the primary mixer.

[0036] It should be noted that, in the present invention, in order to facilitate the transportation of sintering raw materials, the double-layer belt is preferably a U-shaped belt. That is, the upper belt and the lower belt in the double-layer belt are both complete belts, and the upper belt is provided with sieve holes. Thus, the upper belt and the lower belt together constitute a U-shaped screening belt. When the double-layer belt is a U-shaped belt, the aforementioned "above the upper belt", "above the lower belt" and "the upper belt is arranged above the lower belt" are all referring to the upper half of the U-shaped belt. Figure 3-5 As shown, the sintering raw materials (including coarse-grained materials and fine-grained materials) are also transported by the two parallel (or substantially parallel) upper belts and lower belts in the figure.

[0037] In addition, the second water spraying device located between the lower belt and the upper belt in the vertical direction is arranged on the side of the double belt instead of being arranged directly above the lower belt, so as not to affect the screening of the material by the upper belt and the falling of the fine-grained material into the lower belt after screening, that is, the water spraying treatment of the fine-grained material is completed without affecting the distribution of the fine-grained material on the lower belt.

[0038] In the present invention, the system further includes a dust hood and a dust collector. The dust hood is positioned at the feed inlet of the primary mixer. A dust removal duct extending from the dust hood is connected to the gas inlet of the dust collector. Preferably, the dust collector is a bag dust collector.

[0039] Preferably, the dust removal duct has a double-tube structure. The dust removal duct includes an outer shell and an inner liner. The interior space of the inner liner constitutes an inner chamber. An outer chamber is formed between the outer shell and the inner liner. A heat medium inlet and a heat medium outlet are provided in the outer chamber. Preferably, based on the flow of the dust-laden gas, the heat medium inlet is located in the upstream section of the outer shell, and the heat medium outlet is located in the downstream section of the outer shell.

[0040] In the present invention, a coarse-grained material quality detection device is provided on the upper belt of the double-layer belt. A fine-grained material quality detection device is provided on the lower belt. A first moisture detection device is provided at the discharge port of the primary mixer. A dust concentration detection device is provided at the gas inlet of the dust collector. Preferably, a second moisture detection device is provided at the feed port of the primary mixer.

[0041] Preferably, the first water spray device is provided with a first water spray amount detection device. The second water spray device is provided with a second water spray amount detection device. The third water spray device is provided with a third water spray amount detection device. The fourth water spray device is provided with a fourth water spray amount detection device.

[0042] In the present invention, the system further comprises an exhaust fan and a chimney. The gas outlet of the dust collector is connected to the chimney via a gas exhaust duct. The exhaust fan is arranged on the gas exhaust duct.

[0043] In the present invention, the size of the mesh holes on the upper belt is 5-20 mm, preferably 6-15 mm, and more preferably 7-10 mm.

[0044] The present invention proposes a dust removal method and system for a sintering mixer based on a double-layer screening belt. Addressing the serious dust pollution problem in existing sintering primary mixers, the present invention proposes transforming the traditional feed belt into a double-layered belt with screening. The material is screened while being conveyed on the double-layered belt. The screened coarse material is placed on the upper belt, while the fine material passes through the screen holes and falls onto the lower belt. The coarse and fine materials are fed into the primary mixer from different locations, resulting in a material distribution pattern with the coarse material at the top and the fine material at the bottom. Generally speaking, due to their small particle size and light weight, fine particles often have a thin film of air adsorbed on their surface, which prevents dust particles from agglomerating. Therefore, they are less likely to settle in the air and are more suspending, generating more dust when discharged. In contrast, coarse particles, due to their large particle size and high specific gravity, settle more easily, resulting in less dust generation than fine particles. Therefore, the present invention screens the sintering raw materials through a double-layer belt, and the coarse-grained materials and fine-grained materials after screening are discharged separately to achieve a particle size distribution situation in which the coarse-grained materials are on the top and the fine-grained materials are on the bottom. The coarse-grained materials located on the top can effectively suppress the generation of dust from the fine-grained materials at the bottom, thereby greatly reducing the dust concentration of the sintering primary mixer system and solving the problem of serious dust pollution in the sintering mixer in the prior art.

[0045] Preferably, the present invention also separately sprays water on the coarse-grained material and the fine-grained material, that is, water spraying points are set above the upper belt and on the side of the lower belt, and the moisture content of the coarse-grained material and the fine-grained material is increased by water spraying, which reduces the generation of dust of the coarse-grained material and the fine-grained material during the belt conveying process, and at the same time increases the overall moisture content of the material at the feed port of the primary mixer, reducing the generation of dust during the unloading. More preferably, the present invention also adds a water spraying point above the feed end of the double-layer belt, that is, the water spraying is performed before the sintering raw materials are fed onto the double-layer belt through the feed funnel and the sintering raw materials are screened, which can reduce the generation of dust during the unloading of the sintering raw materials onto the belt, and reduce the generation of dust during the screening process of the sintering raw materials, that is, alleviate dust pollution from the source. More preferably, the present invention also provides a water spraying point in the primary mixer, that is, the water spraying is performed during the mixing of the coarse-grained material and the fine-grained material in the primary mixer. The water spraying treatment in the primary mixer is mainly to continue to add water to moisten and mix the sintering raw materials on the basis of the aforementioned water spraying treatment, so that the moisture, particle size and various components in the sintering mixture are evenly distributed to meet the granulation requirements of the sintering process; at the same time, further suppress the generation of dust to ensure the dust emission level of the system.

[0046] In the present invention, the particle size-based discharge of the double-layer belt and the linkage water spraying of multiple water spraying points on the double-layer belt and in the primary mixer can effectively reduce the generation of dust in the sintering primary mixer system. In order to further ensure the emission level of dust in the system, the present invention sends the dust-laden gas generated when the coarse-grained material and the fine-grained material on the double-layer belt are discharged to the primary mixer through a dust removal pipe into the dust collector for dust removal treatment. Preferably, the dust removal pipe in the present invention adopts a double-tube structure, and the dust-laden gas generated during the discharge process of the coarse-grained material on the double-layer belt and the fine-grained material under the sieve enters the dust collector for treatment through the inner chamber of the dust removal pipe; at the same time, a heat medium is introduced into the outer chamber of the dust removal pipe. Since a heat medium is introduced into the outer chamber of the dust removal pipe, the dust entering the inner chamber of the dust removal pipe at this time indirectly exchanges heat with the heat medium, thereby increasing the dust temperature and keeping the dust temperature above the dew point temperature of the dust-laden gas, thereby avoiding the generation of condensed water and effectively preventing compaction. Therefore, the dual-tube dust removal duct structure of the present invention further solves the problem of excessive dust in the sintering primary mixer and the condensation-induced clogging of the dust removal duct, further improving the dust pollution of the entire system. In the present invention, the dew point temperature of the dust-laden gas is approximately 60°C, and the temperature of the heat medium is higher than the dew point temperature of the dust-laden gas. For example, the temperature of the heat medium is 100-300°C, preferably 120-280°C, and more preferably 150-250°C. The heat medium can be hot air (such as hot exhaust gas) or hot water.

[0047] In the present invention, the linkage water spraying of multiple water spraying points on the double-layer belt and in the primary mixer needs to meet the dust emission level of the sintering primary mixer system on the one hand, and on the other hand, it needs to take into account the needs of the sintering process conditions and meet the moisture content requirements of the sintering first mixed material. In the first solution, by detecting the discharge rate of coarse particles on the double-layer belt per unit time and the discharge rate of fine particles under the double-layer belt per unit time, the dust concentration upper limit of the dust-laden gas entering the dust collector is set to C max , mg / m 3 Combined with the average particle size of the sintered mixed material, the total amount of water spray required for sintering the raw materials per unit time can be accurately calculated, thereby ensuring that the dust concentration at the gas inlet of the dust collector is lower than C max .

[0048] In the second scheme, the initial total water spraying rate for the sintering raw materials is set, the actual moisture content of the sintering mixture at the primary mixer outlet is detected, and the target moisture content of the sintering mixture is set to W0%. By comparing the detected actual moisture content of the sintering mixture with the target moisture content, the real-time total water spraying rate for the sintering raw materials is adjusted to ensure that the moisture content of the sintering mixture at the primary mixer outlet is W0 (or approaches W0).

[0049] Based on the above-mentioned sintering mixer dust removal method, the present invention also proposes a sintering mixer dust removal system based on a double-layer screening belt. The system includes a primary mixer and a double-layer belt. The double-layer belt is preferably a U-shaped screening belt, including an upper belt arranged on the outer ring and a lower belt arranged on the inner ring, and the upper belt and the lower belt are respectively driven by their respective rollers for transmission and transportation. The upper belt is provided with sieve holes, through which the sintering raw materials are screened into coarse-grained materials on the sieve (placed on the upper belt) and fine-grained materials under the sieve (falling onto the lower belt). The discharge end of the upper belt and the discharge end of the lower belt both extend into the feed port of the primary mixer. Since the double-layer belt is U-shaped, the lower belt of the inner ring needs to be connected to a discharge channel at the discharge end. The discharge port of the discharge channel extends toward the bottom of the primary mixer, thereby discharging the fine-grained materials on the lower belt into the primary mixer. The size of the mesh holes on the upper belt is 5-20 mm, preferably 6-15 mm, and more preferably 7-10 mm.

[0050] In the present invention, a first water spray device is provided above the upper belt. The first water spray device is mainly used to spray water on the coarse-grained materials after screening by the double-layer belt, thereby reducing the generation of dust during the transportation process and the discharge of the coarse-grained materials to the primary mixer. A second water spray device is provided on the side of the double-layer belt, and in the vertical direction, the second water spray device is located between the lower belt and the upper belt. The second water spray device is mainly used to spray water on the fine-grained materials after screening by the double-layer belt, thereby reducing the generation of dust during the transportation process and the discharge of the fine-grained materials to the primary mixer. A third water spray device is provided above the feed end of the double-layer belt. The third water spray device is mainly used to spray water on the sintering raw materials that have not yet been screened and are distributed on the double-layer belt, thereby increasing the moisture content of the sintering raw materials and alleviating dust pollution from the source. A fourth water spray device is provided in the primary mixer. The fourth water spraying device is mainly used to spray water on coarse-grained materials and fine-grained materials during the mixing process. On the one hand, when the moisture content does not meet the sintering process requirements (which can be detected and judged by the second moisture detection device set at the feed inlet of the primary mixer), additional water spraying is performed. At the same time, it also further reduces the generation of dust and effectively improves the dust pollution of the sintering primary mixer system.

[0051] The present invention also includes a dust hood and a dust collector arranged at the feed port of the primary mixer. The dust hood is connected to the gas inlet of the dust collector through a dust removal duct, and the gas outlet of the dust collector is connected to the exhaust fan and the chimney in sequence through a gas exhaust duct. The dust removal duct described in the present invention is a double-tube structure, including a double-layer structure of an outer shell and an inner liner. The internal space of the inner liner constitutes an inner chamber, and an outer chamber is provided between the inner liner and the outer shell. The outer chamber is used to introduce heat medium, and the inner chamber provides an airflow channel for dust-laden gas. In order to reduce the dust removal load of the dust collector, the heat medium introduced into the outer chamber in the present invention does not enter the dust collector to participate in the dust removal process, and therefore a heat medium inlet and a heat medium outlet are provided on the outer chamber. During the dust removal process, the dust-laden gas generated in the primary mixer enters the dust collector through the inner chamber of the dust removal pipe for purification; at the same time, a heat medium (such as hot water or hot steam, etc.) is introduced into the outer chamber to increase the temperature of the dust-laden gas in the dust removal pipe, so that the temperature of the dust-laden gas is always maintained above the dew point temperature to avoid the generation of condensed water, which can effectively prevent hardening and avoid clogging of the dust removal pipe. In order to facilitate the heat exchange between the heat medium and the dust-laden gas in the inner chamber during the entire process of entering the outer chamber, the heat medium inlet is arranged at the upstream section of the outer shell, and the heat medium outlet is arranged at the downstream section of the outer shell along the direction of the dust-laden gas. There is no specific limitation on the dust collector, as long as it can meet the dust removal requirements. For example, the dust collector can be a bag dust collector. The sintered raw material ash collected by the dust collector is returned to the feed belt for recycling.

[0052] In the present invention, the first water spray device is provided with a first water spray amount detection device for controlling the amount of water sprayed by the first water spray device on the coarse-grained material on the upper belt. The second water spray device is provided with a second water spray amount detection device for controlling the amount of water sprayed by the second water spray device on the fine-grained material on the lower belt. The third water spray device is provided with a third water spray amount detection device for controlling the amount of water sprayed by the third water spray device at the feed end of the double-layer belt. The fourth water spray device is provided with a fourth water spray amount detection device for controlling the amount of water sprayed by the fourth water spray device inside the primary mixer. A first moisture detection device and a second moisture detection device are provided at the feed inlet and the discharge port of the primary mixer, respectively. A dust concentration detection device is also provided at the gas inlet of the dust collector. That is, the present invention performs real-time detection of the dust concentration at the gas inlet of the dust collector and the moisture content of the inlet and outlet of the primary mixer. According to the above real-time detection results, the mixing effect of the primary mixer and the dust control situation are evaluated, and the water spraying amount of each water spraying device is adjusted accordingly, thereby effectively solving the dust pollution problem under the premise of ensuring the mixing effect, and at the same time controlling the actual moisture content of the sintering mixture to be within the target moisture content range of the sintering process conditions.

[0053] In addition, a coarse-grained material quality detection device is provided on the upper belt, and a fine-grained material quality detection device is provided on the lower belt. The coarse-grained material quality detection device can detect the amount of coarse-grained material discharged per unit time, and the fine-grained material detection device can detect the amount of fine-grained material discharged per unit time. Based on the above analysis, more fine-grained material generates more dust, and conversely, more coarse-grained material generates relatively less dust. Accordingly, the amount of water sprayed for coarse-grained material and fine-grained material is also different. That is, the first water spraying device provided on the upper belt of the present invention can also adjust the amount of water sprayed in real time according to the amount of coarse-grained material. At the same time, the second water spraying device provided on the lower belt can also adjust the amount of water sprayed in real time according to the amount of fine-grained material.

[0054] The present invention has requirements for the moisture content of the material at the discharge port of the primary mixer according to the sintering process. The moisture content of the material at the discharge port of the primary mixer is ≤15%, preferably ≤12%, and more preferably ≤10%. The current dust concentration emission standard is 20mg / m 3 Therefore, the dust concentration of the dust-laden gas at the gas inlet of the dust collector in the present invention is less than 1000 mg / m 3 , preferably <900mg / m 3 , more preferably <800 mg / m 3 .

[0055] Compared with the prior art, the present invention has the following beneficial technical effects:

[0056] 1. The present invention transforms the traditional feed belt into a double-layer belt with screening. The coarse-grained material after screening is placed on the upper belt, and the fine-grained material falls on the lower belt. The coarse-grained material and the fine-grained material are fed into the primary mixer from different positions respectively, thus presenting a material distribution situation with the coarse-grained material on the top and the fine-grained material on the bottom, which can effectively suppress the generation of dust during the feeding process.

[0057] 2. The present invention adds multiple water spraying points on the double-layer belt and in the primary mixer, especially for coarse-grained materials and fine-grained materials to spray water separately, thereby increasing the humidity of the materials and alleviating dust pollution from the source, greatly reducing the generation of dust during the material distribution, feeding and unloading processes, and further improving the dust pollution problem in the sintering primary mixing system.

[0058] 3. The dust removal pipe in the present invention adopts a double-tube structure. During the dust removal process, the dust-laden gas enters the dust collector through the inner chamber of the dust removal pipe for purification; at the same time, a heat medium is introduced into the outer chamber to increase the temperature of the dust-laden gas in the dust removal pipe, so that the temperature of the dust-laden gas is always maintained above the dew point temperature to avoid the generation of condensed water, which can effectively prevent hardening and avoid blockage of the dust removal pipe.

[0059] 4. The present invention performs real-time detection on the dust concentration at the gas inlet of the dust collector, the feeding amount of coarse-grained materials and fine-grained materials per unit time, and the moisture content of the inlet and outlet materials of the primary mixer. Based on the above real-time detection results, the mixing effect of the primary mixer and the dust control situation are evaluated, and the water spraying amount of each water spraying device is adjusted accordingly, thereby effectively solving the dust pollution problem while ensuring the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a process flow chart of a sintering mixer dust removal method based on a double-layer screening belt according to the present invention;

[0061] Figure 2 This is a second process flow chart of a sintering mixer dust removal method based on a double-layer screening belt according to the present invention;

[0062] Figure 3 This is a schematic structural diagram of a sintering mixer dust removal system based on a double-layer screening belt according to the present invention;

[0063] Figure 4 Schematic diagram of the structure of the double-layer screening belt in the present invention;

[0064] Figure 5 It is a left side view of the double-layer screening belt and the water spraying device of the present invention;

[0065] Figure 6 It is a structural schematic diagram of the dust removal pipeline in the present invention.

[0066] Reference numerals:

[0067] 1: Primary mixer; 2: Double belt; 201: Upper belt; 202: Lower belt; 203: Discharge channel; 3: Dust removal duct; 301: Inner chamber; 302: Outer chamber; 303: Outer shell; 304: Inner liner; 305: Heat medium inlet; 306: Heat medium outlet; 4: Dust collector; 5: Chimney; 601: First water spray device; 602: Second water spray device; 603: Third water spray device; 604: Fourth water spray device Device; 7: Dust hood; 801: Coarse-grained material quality detection device; 802: Fine-grained material quality detection device; 901: First moisture detection device; 902: Second moisture detection device; 10: Dust concentration detection device; 1101: First water spray volume detection device; 1102: Second water spray volume detection device; 1103: Third water spray volume detection device; 1104: Fourth water spray volume detection device; 12: Exhaust fan; 13: Gas exhaust pipe. DETAILED DESCRIPTION

[0068] According to a second embodiment of the present invention, a sintering mixer dust removal system based on a double-layer screening belt is provided.

[0069] A sintering mixer dust removal system based on a double-layer screening belt, or a sintering mixer dust removal system used in the method described in the first embodiment, comprises a primary mixer 1 and a double-layer belt 2. The double-layer belt 2 comprises an upper belt 201 and a lower belt 202. The discharge ends of the upper belt 201 and the lower belt 202 both extend into the feed port of the primary mixer 1. The upper belt 201 is positioned above the lower belt 202 and is provided with screen holes.

[0070] In the present invention, the double-layer belt 2 is a U-shaped screening belt. It comprises an upper belt 201 disposed on the outer ring and a lower belt 202 disposed on the inner ring. The discharge ends of the upper belt 201 and the lower belt 202 both extend into the feed port of the primary mixer 1. The discharge end of the lower belt 202 is also connected to a discharge channel 203. The discharge port of the discharge channel 203 extends toward the bottom of the primary mixer 1.

[0071] Preferably, the system includes a first water spraying device 601. The first water spraying device 601 is arranged above the upper belt 201.

[0072] Preferably, the system includes a second water spraying device 602. The second water spraying device 602 is arranged on the side of the double belt 2, and in the vertical direction, the second water spraying device 602 is located above the lower belt 202, preferably between the lower belt 202 and the upper belt 201.

[0073] Preferably, the system includes a third water spraying device 603. The third water spraying device 603 is arranged above the feeding end of the upper belt 201.

[0074] Preferably, the system includes a fourth water spraying device 604. The fourth water spraying device 604 is arranged in the primary mixer 1.

[0075] In the present invention, the system further comprises a dust hood 7 and a dust collector 4. The dust hood 7 is disposed at the feed port of the primary mixer 1. A dust removal duct 3 extending from the dust hood 7 is connected to the gas inlet of the dust collector 4. Preferably, the dust collector 4 is a bag dust collector.

[0076] Preferably, the dust removal duct 3 has a double-tube structure. The dust removal duct 3 includes an outer shell 303 and an inner liner 304. The interior space of the inner liner 304 constitutes an inner chamber 301. An outer chamber 302 is formed between the outer shell 303 and the inner liner 304. A heat medium inlet 305 and a heat medium outlet 306 are provided in the outer chamber 302. Preferably, based on the flow of the dust-laden gas, the heat medium inlet 305 is located upstream of the outer shell 303, and the heat medium outlet 306 is located downstream of the outer shell 303.

[0077] In the present invention, the upper belt 201 of the double-layer belt 2 is equipped with a coarse-grained material quality detection device 801. The lower belt 202 is equipped with a fine-grained material quality detection device 802. A first moisture detection device 901 is installed at the discharge port of the primary mixer 1. A dust concentration detection device 10 is installed at the gas inlet of the dust collector 4. Preferably, a second moisture detection device 902 is installed at the feed port of the primary mixer 1.

[0078] Preferably, the first water spraying device 601 is provided with a first water spraying amount detection device 1101. The second water spraying device 602 is provided with a second water spraying amount detection device 1102. The third water spraying device 603 is provided with a third water spraying amount detection device 1103. The fourth water spraying device 604 is provided with a fourth water spraying amount detection device 1104.

[0079] In the present invention, the system further comprises an exhaust fan 12 and a chimney 5. The gas outlet of the dust collector 4 is connected to the chimney 5 via a gas exhaust duct 13. The exhaust fan 12 is provided on the gas exhaust duct 13.

[0080] In the present invention, the size of the mesh holes on the upper belt 201 is 5-20 mm, preferably 6-15 mm, and more preferably 7-10 mm.

[0081] Example 1

[0082] like Figure 3 The figure shows a sintering mixer dust removal system based on a double-layer screening belt. The system includes a primary mixer 1 and a double-layer belt 2. The double-layer belt 2 includes an upper belt 201 and a lower belt 202. The discharge ends of the upper belt 201 and the lower belt 202 both extend into the feed port of the primary mixer 1. The upper belt 201 is arranged above the lower belt 202 and is provided with screen holes.

[0083] Example 2

[0084] like Figure 4As shown, Example 1 is repeated, except that the double-layer belt 2 is a U-shaped screening belt. The U-shaped screening belt includes an upper belt 201 disposed on the outer ring and a lower belt 202 disposed on the inner ring. The discharge ends of the upper belt 201 and the lower belt 202 both extend into the feed port of the primary mixer 1. The discharge end of the lower belt 202 is also connected to a discharge channel 203. The discharge port of the discharge channel 203 extends toward the bottom of the primary mixer 1.

[0085] Example 3

[0086] The second embodiment is repeated, except that the system includes a first water spraying device 601. The first water spraying device 601 is arranged above the upper belt 201.

[0087] Example 4

[0088] like Figure 5 As shown, embodiment 3 is repeated, and the system includes a second water spraying device 602. The second water spraying device 602 is arranged on the side of the double-layer belt 2, and in the vertical direction, the second water spraying device 602 is located between the lower belt 202 and the upper belt 201.

[0089] Example 5

[0090] Example 4 is repeated, except that the system includes a third water spraying device 603. The third water spraying device 603 is arranged above the feed end of the upper belt 201.

[0091] Example 6

[0092] The embodiment 5 is repeated except that the system includes a fourth water spraying device 604. The fourth water spraying device 604 is arranged in the primary mixer 1.

[0093] Example 7

[0094] Example 6 was repeated, except that the system further included a dust hood 7 and a dust collector 4. The dust hood 7 was positioned at the feed inlet of the primary mixer 1. A dust removal duct 3 extending from the dust hood 7 was connected to the gas inlet of the dust collector 4. The dust collector 4 was a bag dust collector.

[0095] Example 8

[0096] like Figure 6As shown, Example 7 is repeated, except that the dust removal duct 3 adopts a double-tube structure. The dust removal duct 3 includes an outer shell 303 and an inner liner 304. The interior space of the inner liner 304 constitutes an inner chamber 301. An outer chamber 302 is formed between the outer shell 303 and the inner liner 304. The outer chamber 302 is provided with a heat medium inlet 305 and a heat medium outlet 306. According to the flow of the dust-laden gas, the heat medium inlet 305 is located in the upstream section of the outer shell 303, and the heat medium outlet 306 is located in the downstream section of the outer shell 303.

[0097] Example 9

[0098] Example 8 was repeated, except that a coarse-grained material quality detection device 801 was provided on the upper belt 201 of the double-layer belt 2. A fine-grained material quality detection device 802 was provided on the lower belt 202. A first moisture detection device 901 was provided at the discharge port of the primary mixer 1. A dust concentration detection device 10 was provided at the gas inlet of the dust collector 4.

[0099] Example 10

[0100] Example 9 is repeated, except that a second moisture detection device 902 is provided at the feed inlet of the primary mixer 1 .

[0101] Example 11

[0102] Example 10 is repeated, except that the first water spraying device 601 is provided with a first water spraying amount detection device 1101. The second water spraying device 602 is provided with a second water spraying amount detection device 1102. The third water spraying device 603 is provided with a third water spraying amount detection device 1103. The fourth water spraying device 604 is provided with a fourth water spraying amount detection device 1104.

[0103] Example 12

[0104] Example 11 is repeated, except that the system further includes an exhaust fan 12 and a chimney 5. The gas outlet of the dust collector 4 is connected to the chimney 5 via a gas exhaust duct 13. The exhaust fan 12 is provided on the gas exhaust duct 13.

[0105] Example 13

[0106] Example 12 was repeated except that the size of the mesh holes on the upper belt 201 was 5 mm.

[0107] Example 14

[0108] Example 12 was repeated except that the size of the mesh holes on the upper belt 201 was 8 mm.

[0109] Example 15

[0110] Example 12 was repeated except that the size of the mesh holes on the upper belt 201 was 10 mm.

[0111] Example 16

[0112] A sintering mixer dust removal method based on a double-layer screening belt, the method comprising the following steps:

[0113] 1) The sintering raw materials are screened by a double-layer belt 2 with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve.

[0114] 2) The coarse particles on the screen are transported to the primary mixer 1 via the upper belt 201 of the double-layer belt 2, and the fine particles under the screen are transported to the primary mixer 1 via the lower belt 202 of the double-layer belt 2.

[0115] 3) The coarse particles on the sieve and the fine particles under the sieve entering the primary mixer 1 are mixed to obtain a sintered mixed material.

[0116] Example 17

[0117] A sintering mixer dust removal method based on a double-layer screening belt, the method comprising the following steps:

[0118] 1) The sintering raw materials are screened by a double-layer belt 2 with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve.

[0119] 2) The coarse particles on the sieve are transported to the primary mixer 1 via the upper belt 201 of the double-layer belt 2, and the fine particles under the sieve are transported to the primary mixer 1 via the lower belt 202 of the double-layer belt 2. Simultaneously, during the material transportation process, the coarse particles on the sieve and the fine particles on the double-layer belt 2 are sprayed with water.

[0120] 3) The coarse particles on the sieve and the fine particles under the sieve entering the primary mixer 1 are mixed to obtain a sintered mixed material.

[0121] Example 18

[0122] A sintering mixer dust removal method based on a double-layer screening belt, the method comprising the following steps:

[0123] 1) The sintering raw materials are fed through a feeding hopper onto a double-layer belt 2, where they are sprayed with water during the feeding process. The sintering raw materials are screened by a double-layer belt 2 with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve.

[0124] 2) The coarse particles on the sieve are transported to the primary mixer 1 via the upper belt 201 of the double-layer belt 2, and the fine particles under the sieve are transported to the primary mixer 1 via the lower belt 202 of the double-layer belt 2. Simultaneously, during the material transportation process, the coarse particles on the sieve and the fine particles on the double-layer belt 2 are sprayed with water.

[0125] 3) The coarse particles on the sieve and the fine particles under the sieve entering the primary mixer 1 are mixed to obtain a sintered mixed material.

[0126] Example 19

[0127] A sintering mixer dust removal method based on a double-layer screening belt, the method comprising the following steps:

[0128] 1) The sintering raw materials are fed through a feeding hopper onto a double-layer belt 2, where they are sprayed with water during the feeding process. The sintering raw materials are screened by a double-layer belt 2 with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve.

[0129] 2) The coarse particles on the sieve are transported to the primary mixer 1 via the upper belt 201 of the double-layer belt 2, and the fine particles under the sieve are transported to the primary mixer 1 via the lower belt 202 of the double-layer belt 2. Simultaneously, during the material transportation process, the coarse particles on the sieve and the fine particles on the double-layer belt 2 are sprayed with water.

[0130] 3) The coarse particles on the sieve and the fine particles under the sieve after the water spraying treatment are mixed evenly in the primary mixer 1. At the same time, the materials in the mixing process are sprayed with water. The coarse particles on the sieve and the fine particles under the sieve are mixed evenly to obtain a sintered mixed material.

[0131] Example 20

[0132] A sintering mixer dust removal method based on a double-layer screening belt, the method comprising the following steps:

[0133] 1) The sintering raw materials are fed through a feeding hopper onto a double-layer belt 2, where they are sprayed with water during the feeding process. The sintering raw materials are screened by a double-layer belt 2 with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve.

[0134] 2) The coarse particles on the sieve are transported to the primary mixer 1 via the upper belt 201 of the double-layer belt 2, and the fine particles under the sieve are transported to the primary mixer 1 via the lower belt 202 of the double-layer belt 2. Simultaneously, during the material transportation process, the coarse particles on the sieve and the fine particles on the double-layer belt 2 are sprayed with water.

[0135] 3) The coarse particles on the sieve and the fine particles under the sieve after the water spraying treatment are mixed evenly in the primary mixer 1. At the same time, the materials in the mixing process are sprayed with water. The coarse particles on the sieve and the fine particles under the sieve are mixed evenly to obtain a sintered mixed material.

[0136] 4) The dust-laden gas generated during the process of feeding the coarse-grained material on the sieve and the fine-grained material under the sieve into the primary mixer 1 enters the dust collector 4 through the dust removal pipe 3. The dust-laden gas is purified in the dust collector 4 and then discharged to the chimney 5.

[0137] 5) During the dust removal process, the sintered raw material ash collected by the dust collector 4 is returned to the double-layer belt 2.

[0138] Example 21

[0139] like Figure 1 As shown, Example 20 is repeated, except that the discharge rate of the coarse particles on the sieve per unit time is L1, kg / s. The discharge rate of the fine particles under the sieve per unit time is L2, kg / s. The upper limit of the dust concentration in the dust-laden gas entering the dust collector 4 is set to C max , mg / m 3 . Calculate the total amount of water sprayed per unit time required to sinter the raw materials, M, mg.

[0140] Where: D is the average particle size of the sintered mixture, mm. k1 is the water injection correction coefficient, and the value of k1 is 2*10 9 , m. C max <800 mg / m 3 .

[0141] In unit time, the total water spraying amount for the sintering raw materials is maintained at not less than M, so that the dust concentration at the gas inlet of the dust collector 4 is lower than C max .

[0142] Example 22

[0143] like Figure 2 As shown, Example 20 was repeated, except that the initial total water spray rate for the sintering raw materials was set to M0, g / s. The actual moisture content W,% of the sintering mixture at the discharge port of the primary mixer 1 was detected. Based on the required sintering conditions, the target moisture content of the sintering mixture was set to W0,%. The difference between the actual moisture content W of the sintering mixture and the target moisture content W0 was determined, and the real-time total water spray rate M1, g / s for the sintering raw materials was adjusted. Specifically,

[0144] When W<W0, M1=[1+k2·(W0-W)]×M0.

[0145] When W=W0, M1=M0.

[0146] When W>W0, M1=[1-k3·(W-W0)]×M0.

[0147] Where: k2 and k3 are water spraying rate adjustment constants, k2 ranges from 3 to 10, k3 ranges from 1 to 8. W0 ≤ 10%.

[0148] The actual moisture content W of the sintered mixed material is detected in real time, and the real-time total water spraying amount of the sintered raw material is adjusted to M1, so that the moisture content of the sintered mixed material at the discharge port of the primary mixer 1 is W0.

[0149] Example 23

[0150] Example 20 was repeated, except that in step 4), the dust removal duct 3 had a double-tube structure. The dust-laden gas generated during the discharge of the coarse-grained material on the sieve and the fine-grained material under the sieve entered the dust collector 4 for treatment through the inner chamber 301 of the dust removal duct 3. At the same time, a heat medium was introduced into the outer chamber 302 of the dust removal duct 3.

[0151] Example 24

[0152] Example 23 was repeated, except that the temperature of the heat medium was higher than the dew point temperature of the dust-laden gas. The temperature of the heat medium was 200° C. The heat medium was hot exhaust gas.

[0153] Example 25

[0154] Example 23 was repeated, except that the temperature of the heat medium was higher than the dew point temperature of the dust-laden gas. The temperature of the heat medium was 100° C. The heat medium was hot water.

[0155] Application Example 1

[0156] The method described in Example 21 was used in the sintering primary mixed dust removal process. The discharge rate of the coarse particles on the screen per unit time was L1 = 3.6 kg / s. The discharge rate of the fine particles under the screen per unit time was L2 = 2 kg / s. The upper limit of the dust concentration in the dust-laden gas entering the dust collector 4 was set to C max =670mg / m 3 Calculate the total amount of water sprayed (M, mg) required to sinter the raw materials within unit time (1s).

[0157] Where: D is the average particle size of the sintered mixture, D = 8mm. k1 is the water injection correction coefficient, k1 = 2 × 10 9 m.

[0158] In unit time, the total amount of water sprayed on the sintering raw materials is maintained at not less than 462.74g, so that the dust concentration at the gas inlet of the dust collector 4 is lower than C max .

[0159] Application Example 2

[0160] The method described in Example 22 is used in the sintering primary mixing and dust removal process, and the initial total water spraying rate for the sintering raw materials is set to M0 = 680 g / s. The actual moisture content W of the sintering primary mixture at the discharge port of the primary mixer 1 is detected to be 11%. According to the sintering conditions, the target moisture content of the sintering primary mixture is set to W0 = 9%. The actual moisture content W of the sintering primary mixture is judged to be greater than the target moisture content W0, and the real-time total water spraying rate M1, g / s, for the sintering raw materials is adjusted. Specifically,

[0161] Since W>W0, M1=[1-k3·(W-W0)]×M0=598.4g / s.

[0162] Among them: k3 is the water spray volume adjustment constant, k3=6.

[0163] The real-time total water spraying rate for the sintering raw materials was adjusted to 598.4 g / s, so that the moisture content of the sintered mixed material at the discharge port of the primary mixer 1 approached W0.

[0164] Application Example 3

[0165] The method described in Example 22 is used in the sintering primary mixing and dust removal process, and the initial total water spraying rate for the sintering raw materials is set to M0 = 560 g / s. The actual moisture content W = 9% of the sintering primary mixture at the discharge port of the primary mixer 1 is detected. According to the sintering conditions, the target moisture content of the sintering primary mixture is set to W0 = 9%. The difference between the actual moisture content W of the sintering primary mixture and the target moisture content W0 is judged, and the real-time total water spraying rate M1, g / s, for the sintering raw materials is adjusted. Specifically,

[0166] Since W=W0, M1=M0.

[0167] The real-time total water spraying rate for the sintering raw materials is maintained at 560 g / s, so that the moisture content of the sintered mixed material at the discharge port of the primary mixer 1 is W0.

[0168] Application Example 4

[0169] The method described in Example 22 is used in the sintering primary mixing and dust removal process, and the initial total water spray rate for the sintering raw materials is set to M0 = 500 g / s. The actual moisture content W of the sintering primary mixture at the discharge port of the primary mixer 1 is detected to be 8%. According to the sintering conditions, the target moisture content of the sintering primary mixture is set to W0 = 9%. The difference between the actual moisture content W of the sintering primary mixture and the target moisture content W0 is judged, and the real-time total water spray rate M1, g / s, for the sintering raw materials is adjusted. Specifically,

[0170] Since W<W0, M1=[1+k2·(W0-W)]×M0=540g / s.

[0171] Among them: k2 is the water spray volume adjustment constant, k2=8.

[0172] The real-time total water spraying rate for the sintering raw materials is adjusted to 540 g / s, so that the moisture content of the sintered mixed material at the discharge port of the primary mixer 1 is W0.

Claims

1. A method for removing dust from a sintering mixer based on a double-layer screening belt, the method comprising the following steps: 1) Sintering raw materials are screened through a double-layer belt (2) with sieve holes to obtain coarse particles on the sieve and fine particles under the sieve; 2) The coarse particles on the screen are transported to the primary mixer (1) via the upper belt (201) of the double belt (2), and the fine particles under the screen are transported to the primary mixer (1) via the lower belt (202) of the double belt (2); 3) The coarse particles on the sieve and the fine particles under the sieve entering the primary mixer (1) are mixed to obtain a sintered mixed material.

2. The dust removal method for a sintering mixer according to claim 1, characterized in that: In step 2), the coarse particles on the upper belt (201) are sprayed with water; and / or In step 2), the undersized fine particles on the lower belt (202) are sprayed with water.

3. The dust removal method for a sintering mixer according to claim 1, characterized in that: In step 1), the sintering raw materials are subjected to water spraying treatment before being screened; and / or In step 3), the material in the mixing process is sprayed with water.

4. The dust removal method for a sintering mixer according to any one of claims 1 to 3, characterized in that: The method further includes: 4) Dust-laden gas generated by the coarse-grained material on the sieve and the fine-grained material under the sieve during the process of feeding to the primary mixer (1) enters the dust collector (4) through the dust removal pipe (3). The dust-laden gas is purified in the dust collector (4) and then discharged to the chimney (5); 5) During the dust removal process, the sintered raw material ash collected by the dust collector (4) is returned to the double-layer belt (2).

5. The dust removal method for a sintering mixer according to claim 4, characterized in that: Detect the amount of coarse particles on the sieve to be discharged per unit time L1, kg / s; detect the amount of fine particles under the sieve to be discharged per unit time L2, kg / s; set the upper limit of dust concentration in the dust-laden gas entering the dust collector (4) to C max , mg / m 3 ; Calculate the total water spraying volume M, mg, required for sintering raw materials per unit time; ; Where: D is the average particle size of the sintered mixture, mm; k1 is the water injection correction coefficient, the value of k1 is 1*10 9 ~5*10 9 ,m;C max <1000mg / m 3 ; In unit time, the total water spraying amount for the sintering raw materials is maintained to be not less than M, so that the dust concentration at the gas inlet of the dust collector (4) is lower than C max .

6. The dust removal method for a sintering mixer according to claim 5, characterized in that: C max <900mg / m 3 。 7. The dust removal method for a sintering mixer according to claim 6, characterized in that: C max <800mg / m 3 。 8. The dust removal method for a sintering mixer according to claim 3, characterized in that: The total initial water spraying rate for the sintering raw materials is set to M0, g / s; the actual moisture content W of the sintering mixed material at the discharge port of the primary mixer (1) is detected; % According to the sintering conditions, the target moisture content of the sintering mixture is set to W0,%; Determine the difference between the actual moisture content W of the sintering mixture and the target moisture content W0, and adjust the real-time total water injection rate M1 (g / s) of the sintering raw materials; specifically: When W<W0, M1=[1+k2·(W0-W)]×M0; When W=W0, M1=M0; When W>W0, M1=[1-k3·(W- W0)]×M0; Among them: k2 and k3 are the water spraying adjustment constants, the value of k2 is 3~10; the value of k3 is 1~8; W0≤15%; The actual moisture content W of the sintered mixed material is detected in real time, and the total real-time water spraying amount of the sintered raw material is adjusted to M1, so that the moisture content of the sintered mixed material at the discharge port of the primary mixer (1) is W0.

9. The dust removal method for a sintering mixer according to claim 8, characterized in that: W0≤12%。 10. The dust removal method for a sintering mixer according to claim 9, characterized in that: W0≤10%。 11. The dust removal method for a sintering mixer according to claim 4, characterized in that: In step 4), the dust removal pipe (3) is a double-tube structure, and the dust-laden gas generated by the coarse-grained material on the screen and the fine-grained material under the screen during the feeding process enters the dust collector (4) through the inner chamber (301) of the dust removal pipe (3) for treatment; at the same time, a heat medium is introduced into the outer chamber (302) of the dust removal pipe (3).

12. The dust removal method for a sintering mixer according to claim 11, characterized in that: The temperature of the heat medium is higher than the dew point temperature of the dust-laden gas.

13. The dust removal method for a sintering mixer according to claim 12, characterized in that: The temperature of the heat medium is 100-300°C.

14. The dust removal method for a sintering mixer according to claim 13, characterized in that: The temperature of the heat medium is 120-280°C.

15. The dust removal method for a sintering mixer according to claim 14, characterized in that: The temperature of the heat medium is 150-250°C.

16. The dust removal method for a sintering mixer according to claim 11, characterized in that: The heat medium is hot air or hot water.

17. A sintering mixer dust removal system for the method according to any one of claims 1 to 16, the system comprising a primary mixer (1) and a double-layer belt (2); the double-layer belt (2) comprises an upper belt (201) and a lower belt (202); the discharge ends of the upper belt (201) and the lower belt (202) both extend into the feed port of the primary mixer (1); the upper belt (201) is arranged above the lower belt (202), and the upper belt (201) is provided with sieve holes.

18. The sintering mixer dust removal system according to claim 17, characterized in that: The double-layer belt (2) is a U-shaped screening belt; the U-shaped screening belt comprises an upper belt (201) arranged on an outer ring and a lower belt (202) arranged on an inner ring; the discharge end of the upper belt (201) and the discharge end of the lower belt (202) both extend into the feed port of the primary mixer (1); and the discharge end of the lower belt (202) is also connected to a discharge channel (203); the discharge port of the discharge channel (203) extends toward the bottom of the primary mixer (1).

19. The sintering mixer dust removal system according to claim 17 or 18, characterized in that: The system comprises a first water spraying device (601); the first water spraying device (601) is arranged above the upper belt (201); and / or The system comprises a second water spraying device (602); the second water spraying device (602) is arranged on the side of the double-layer belt (2), and in the vertical direction, the second water spraying device (602) is located above the lower belt (202); and / or The system comprises a third water spraying device (603); the third water spraying device (603) is arranged above the feed end of the upper belt (201); and / or The system comprises a fourth water spraying device (604); the fourth water spraying device (604) is arranged in the primary mixer (1).

20. The sintering mixer dust removal system according to claim 19, characterized in that: The second water spraying device (602) is located between the lower belt (202) and the upper belt (201).

21. The sintering mixer dust removal system according to any one of claims 17-18 and 20, characterized in that: The system further comprises a dust hood (7) and a dust collector (4); the dust hood (7) is arranged at the feed inlet of the primary mixer (1); and a dust removal pipe (3) extending from the dust hood (7) is connected to the gas inlet of the dust collector (4).

22. The sintering mixer dust removal system according to claim 19, characterized in that: The system further comprises a dust hood (7) and a dust collector (4); the dust hood (7) is arranged at the feed inlet of the primary mixer (1); and a dust removal pipe (3) extending from the dust hood (7) is connected to the gas inlet of the dust collector (4).

23. The sintering mixer dust removal system according to claim 21, characterized in that: The dust collector (4) is a bag dust collector.

24. The sintering mixer dust removal system according to claim 22, characterized in that: The dust collector (4) is a bag dust collector.

25. The sintering mixer dust removal system according to claim 21, characterized in that: The dust removal duct (3) is a double-tube structure; the dust removal duct (3) comprises an outer shell (303) and an inner liner (304); the internal space of the inner liner (304) constitutes an inner chamber (301); an outer chamber (302) is formed between the outer shell (303) and the inner liner (304); and a heat medium inlet (305) and a heat medium outlet (306) are provided on the outer chamber (302).

26. The sintering mixer dust removal system according to claim 22, characterized in that: The dust removal duct (3) is a double-tube structure; the dust removal duct (3) comprises an outer shell (303) and an inner liner (304); the internal space of the inner liner (304) constitutes an inner chamber (301); an outer chamber (302) is formed between the outer shell (303) and the inner liner (304); and a heat medium inlet (305) and a heat medium outlet (306) are provided on the outer chamber (302).

27. The sintering mixer dust removal system according to claim 25, characterized in that: According to the direction of the dust-laden gas, the heat medium inlet (305) is arranged at the upstream section of the shell (303), and the heat medium outlet (306) is arranged at the downstream section of the shell (303).

28. The sintering mixer dust removal system according to claim 26, characterized in that: According to the direction of the dust-laden gas, the heat medium inlet (305) is arranged at the upstream section of the shell (303), and the heat medium outlet (306) is arranged at the downstream section of the shell (303).

29. The sintering mixer dust removal system according to claim 21, characterized in that: The upper belt (201) of the double-layer belt (2) is provided with a coarse-grained material quality detection device (801); the lower belt (202) is provided with a fine-grained material quality detection device (802); the discharge port of the primary mixer (1) is provided with a first moisture detection device (901); and the gas inlet of the dust collector (4) is provided with a dust concentration detection device (10).

30. The sintering mixer dust removal system according to claim 22, characterized in that: The upper belt (201) of the double-layer belt (2) is provided with a coarse-grained material quality detection device (801); the lower belt (202) is provided with a fine-grained material quality detection device (802); the discharge port of the primary mixer (1) is provided with a first moisture detection device (901); and the gas inlet of the dust collector (4) is provided with a dust concentration detection device (10).

31. The sintering mixer dust removal system according to claim 29, characterized in that: A second moisture detection device (902) is provided at the feed inlet of the primary mixer (1).

32. The sintering mixer dust removal system according to claim 30, characterized in that: A second moisture detection device (902) is provided at the feed inlet of the primary mixer (1).

33. The sintering mixer dust removal system according to claim 19, characterized in that: The first water spray device (601) is provided with a first water spray quantity detection device (1101); the second water spray device (602) is provided with a second water spray quantity detection device (1102); the third water spray device (603) is provided with a third water spray quantity detection device (1103); and the fourth water spray device (604) is provided with a fourth water spray quantity detection device (1104).

34. The sintering mixer dust removal system according to claim 21, characterized in that: The system further comprises an exhaust fan (12) and a chimney (5); the gas outlet of the dust collector (4) is connected to the chimney (5) via a gas exhaust pipe (13); the exhaust fan (12) is arranged on the gas exhaust pipe (13); and / or The size of the sieve holes on the upper belt (201) is 5-20 mm.

35. The sintering mixer dust removal system according to claim 22, characterized in that: The system further comprises an exhaust fan (12) and a chimney (5); the gas outlet of the dust collector (4) is connected to the chimney (5) via a gas exhaust pipe (13); the exhaust fan (12) is arranged on the gas exhaust pipe (13); and / or The size of the sieve holes on the upper belt (201) is 5-20 mm.

36. The sintering mixer dust removal system according to claim 34, characterized in that: The size of the sieve holes on the upper belt (201) is 6-15 mm.

37. The sintering mixer dust removal system according to claim 35, characterized in that: The size of the sieve holes on the upper belt (201) is 6-15 mm.

38. The sintering mixer dust removal system according to claim 36 or 37, characterized in that: The size of the sieve holes on the upper belt (201) is 7-10 mm.

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