A sintering mixer dust control method and system based on condensation dust removal

Abstract

A sintering mixer dust control method based on condensation-type dust removal comprises the following steps: 1) sintering raw materials are transported to a primary mixer (1) via a feed belt (2); 2) a first water spraying device (3) provided in the primary mixer (1) sprays water on the sintering raw materials, and the sintering raw materials are evenly mixed in the primary mixer (1) to obtain a sintered mixed material; 3) a double-tube dust removal pipe (4) is provided in the primary mixer (1) above the unloading position of the feed belt (2); dust-containing gas generated during the unloading process enters a dust collector (5) through an inner chamber (401) of the dust removal pipe (4) for treatment; and at the same time, a cooling medium is introduced into an outer chamber (402) of the dust removal pipe (4). The present invention can greatly reduce the dust concentration of the sintering primary mixer system, effectively solving the problem of serious dust pollution in the sintering mixer system.

Description

Technical Field

[0001] The invention relates to a dust removal process for a sintering mixer, and in particular to a sintering mixer dust control method and system based on condensation-type dust removal, belonging 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 view of the adverse effects of the quicklime digestion process on the sintering primary mixing in the prior art, the present invention proposes a sintering mixer dust control method and system based on condensation dust removal. The present invention transforms the traditional dust removal pipeline into a double-tube structure. The double-tube dust removal pipeline includes an inner chamber and an outer chamber. During the dust removal process, a cooling medium is introduced into the outer chamber, and the dust-laden gas enters the inner chamber. The dust-laden gas entering the inner chamber indirectly exchanges heat with the cooling medium in the outer chamber, and the dust in the dust-laden gas condenses and grows to form large-particle sintering raw materials. The large-particle sintering raw materials fall back into the primary mixer through the dust removal pipeline, thereby greatly reducing the dust concentration of the sintering primary mixer system, thereby reducing the dust removal load of the dust collector at the end of the system, and also solving the problem that the dust removal pipeline is easily hardened and blocked in the prior art.

[0007] According to a first embodiment of the present invention, a sintering mixer dust control method based on condensation-type dust removal is provided.

[0008] A sintering mixer dust control method based on condensation dust removal, the method comprising the following steps:

[0009] 1) The sintering raw materials are transported to the primary mixer through the feeding belt.

[0010] 2) A first water spraying device arranged in the primary mixer sprays water on the sintering raw materials, and the sintering raw materials are mixed in the primary mixer to obtain a sintered mixed material.

[0011] 3) Inside the primary mixer, a double-tube dust removal duct is installed above the unloading position of the feed belt. The dust-laden gas generated during the unloading process enters the dust collector through the inner chamber of the dust removal duct for treatment. At the same time, a cooling medium is introduced into the outer chamber of the dust removal duct.

[0012] Preferably, in step 3), a cooling medium and a heating medium are periodically and alternately introduced into the outer chamber of the dust removal duct. During the introduction of the cooling medium, the dust in the dust-laden gas condenses and grows to form large-particle sintering raw materials. Part of the large-particle sintering raw materials falls back into the primary mixer through the dust removal duct, while another part adheres to the inner wall of the dust removal duct. During the introduction of the heating medium, the large-particle sintering raw materials adhered to the inner wall of the dust removal duct fall off due to heating, and then fall back into the primary mixer.

[0013] In the present invention, in a single cycle in which the cooling medium and the heating medium are alternately introduced into the outer chamber of the dust removal duct, the duration of the cooling medium introduction is greater than or equal to the duration of the heating medium introduction.

[0014] Preferably, the duration of the cooling medium in a single cycle is 2 to 60 seconds, preferably 3 to 40 seconds, and more preferably 5 to 20 seconds. The duration of the heating medium in a single cycle is 0.1 to 10 seconds, preferably 0.5 to 8 seconds, and more preferably 1 to 5 seconds.

[0015] In the present invention, the temperature of the cooling medium is lower than the dew point temperature of the dust-laden gas. Preferably, the temperature of the cooling medium is 0 to 60° C., preferably 5 to 50° C., and more preferably 10 to 30° C. The cooling medium is cooling air or cooling water.

[0016] In the present invention, 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.

[0017] Preferably, in step 1), before the sintering raw materials enter the primary mixer, the sintering raw materials are sprayed with water by a second water spraying device arranged above the feed belt.

[0018] In the present invention, the method further comprises:

[0019] 4) The dust-laden gas entering the dust collector is purified and then discharged to the chimney.

[0020] 5) During the dust removal process, the sintered raw material ash collected by the dust collector is returned to the feed belt.

[0021] In the present invention, the moisture content of the material at the feed port of the primary mixer is ≤6%, preferably ≤5%, more preferably ≤4%.The moisture content of the material at the discharge port of the primary mixer is <15%, preferably <12%, more preferably <10%.

[0022] In the present invention, the dust concentration of the dust-laden gas at the gas inlet of the dust collector is less than 1g / m 3 , preferably <0.9g / m 3 , more preferably <0.8g / m 3 .

[0023] According to a second embodiment of the present invention, a sintering mixer dust control system based on condensation-type dust removal is provided.

[0024] A sintering mixer dust control system based on condensation-type dust removal, or a sintering mixer dust control system used in the method described in the first embodiment, comprises a primary mixer, a feed belt, a first water spray device, a dust removal duct, and a dust collector. The discharge end of the feed belt extends into the feed inlet of the primary mixer. A dust removal duct is provided within the primary mixer, above the discharge end of the feed belt. The dust collector is disposed outside the primary mixer. The dust removal duct passes through the feed inlet of the primary mixer and is connected to the dust collector. The dust removal duct has a double-tube structure. A first water spray device is provided within the primary mixer.

[0025] In the present invention, 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. The outer chamber is provided with a heat medium inlet, a heat medium outlet, a cooling medium inlet, and a cooling medium outlet.

[0026] Preferably, along the direction of the dust-laden gas, the heat medium inlet and the cooling medium inlet are arranged at the upstream section of the shell, and the heat medium outlet and the cooling medium outlet are arranged at the downstream section of the shell.

[0027] In the present invention, the dust removal pipe is arranged in an arc shape and along the material conveying direction, and the arrangement of the dust removal pipe conforms to the law of a decreasing function.

[0028] In the present invention, the dust removal duct includes an air intake section and an exhaust section. The air intake section is disposed within the primary mixer, one end of the exhaust section is connected to the air intake section, and the other end of the exhaust section is connected to the dust collector through the feed inlet of the primary mixer. The air intake section is disposed vertically, and the exhaust section is disposed in an arc shape, and the arrangement of the exhaust section conforms to the law of a decreasing function. Preferably, the air intake end of the dust removal duct is funnel-shaped.

[0029] Preferably, a dust hood is further provided in the primary mixer, wherein the dust hood is connected to the air inlet end of the dust removal duct and is located above the discharge end of the feed belt.

[0030] Preferably, the system further comprises a second water spraying device. The second water spraying device is arranged above the feed belt. Preferably, the second water spraying device is located above the feed end of the feed belt.

[0031] Preferably, the first water spraying device is provided with a first water spraying amount detection device. The second water spraying device is provided with a second water spraying amount detection device.

[0032] Preferably, a first moisture detection device is provided at the feed inlet of the primary mixer.

[0033] Preferably, a second moisture detection device is provided at the discharge port of the primary mixer.

[0034] Preferably, a dust concentration detection device is provided at the gas inlet of the dust collector.

[0035] 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.

[0036] In the present invention, the system further comprises a feeding funnel which is arranged above the feeding end of the feeding belt.

[0037] The present invention proposes a sintering mixer dust control method and system based on condensation-type dust removal. Addressing the problem in the prior art that the dust removal duct within the sintering primary mixer system is prone to compaction and clogging due to water vapor condensing into water and adhering to dust, the present invention proposes a treatment method in which the dust removal duct is directly converted into a double-tube structure and a cooling medium is introduced into the outer chamber of the double-tube structure. The sintering raw material is transported to the primary mixer, and the dust-laden gas generated within the primary mixer enters the dust collector for treatment via the inner chamber of the dust removal duct. Simultaneously, a cooling medium is introduced into the outer chamber of the dust removal duct. The dust-laden gas entering the inner chamber indirectly exchanges heat with the cooling medium in the outer chamber, and the water vapor in the dust-laden gas condenses into a liquid phase, which condenses and grows with the dust to form large-particle sintering raw material. The large-particle sintering raw material falls back into the primary mixer via the dust removal duct, thereby greatly reducing the dust concentration in the sintering primary mixer system and thereby alleviating the dust removal load of the system's terminal dust collector. Furthermore, the problem of the dust removal duct being prone to compaction and clogging in the prior art is resolved.

[0038] As a preferred embodiment, the outer chamber of the dust removal duct is alternately introduced with a cooling medium and a heating medium in a periodic manner. The continuous introduction of a cooling medium and a heating medium is one cycle. First, in the process of introducing the cooling medium into the outer chamber of the dust removal duct, the dust-laden gas in the inner chamber indirectly exchanges heat with the cooling medium, that is, the dust (or most of the dust) in the dust-laden gas condenses and grows when it is cooled to form large-particle sintering raw materials. The large-particle sintering raw materials formed fall back into the primary mixer through the inner chamber of the dust removal duct under the action of gravity; or, among all the large-particle sintering raw materials formed, a part of the large-particle sintering raw materials falls back into the primary mixer through the dust removal duct, and the other part of the large-particle sintering raw materials adhere to the inner wall of the inner chamber of the dust removal duct. After the introduction of the cooling medium is stopped, the heat medium begins to be introduced into the outer chamber of the dust removal pipe. During the process of introducing the heat medium, the large-particle sintered raw materials attached to the inner wall of the inner chamber of the dust removal pipe indirectly exchange heat with the heat medium, that is, the large-particle sintered raw materials fall off from the inner wall of the dust removal pipe after being heated, and then fall back into the primary mixer under the action of gravity. It should be noted that during the same time period when the heat medium is introduced, new dust will be generated when the sintered raw materials are continuously fed into the primary mixer. This part of the newly generated dust enters the inner chamber of the dust removal pipe. Since the heat medium is introduced at this time, this part of the newly generated dust will not condense and condense, and the dust directly enters the dust collector for treatment. When all (or most) of the large-particle sintered raw materials attached to the inner wall of the dust removal pipe fall back into the primary mixer, the introduction of the heat medium is stopped, and the cooling medium is introduced again, and the cycle is repeated. In the present invention, cooling medium and hot medium are periodically and alternately introduced into the outer chamber of the dust removal pipe. On the one hand, small particles of dust can be condensed into large particles of sintering raw materials for recycling, thereby reducing the dust removal load of the dust collector at the end of the system and extending the service life of the dust collector; on the other hand, it can perfectly solve the problem of compaction and even blockage of the dust removal pipe in the prior art.

[0039] Based on the above analysis, the purpose of introducing the cooling medium into the outer chamber of the dust removal pipe is mainly to make the dust in the dust-laden gas condense and grow to form large-particle sintering raw materials, and the purpose of introducing the heat medium into the outer chamber of the dust removal pipe is mainly to heat the large-particle sintering raw materials attached to the inner wall of the dust removal pipe, so that the large-particle sintering raw materials fall off into the primary mixer. Therefore, in a single cycle, the duration of introducing the cooling medium is often greater than (or equal to) the duration of introducing the heat medium, and the temperature of the cooling medium is lower than the dew point temperature of the dust-laden gas, and the temperature of the heat medium is higher than the dew point temperature of the dust-laden gas. In the present invention, the specific duration of introducing the cooling medium and the duration of introducing the heat medium in a single cycle can be adjusted as needed. For example, in a single cycle, the duration of introducing the cooling medium is 2 to 60 seconds, preferably 3 to 40 seconds, and more preferably 5 to 20 seconds. In a single cycle, the duration of introducing the heat medium is 0.1 to 10 seconds, preferably 0.5 to 8 seconds, and more preferably 1 to 5 seconds. The dew point of dust-laden gas is approximately 60°C. Therefore, the temperature of the cooling medium in the present invention is 0-60°C, preferably 5-50°C, and more preferably 10-30°C. The temperature of the heating medium is 100-300°C, preferably 120-280°C, and more preferably 150-250°C. The cooling medium may be cooling air or cooling water, and the heating medium may be hot air or hot water.

[0040] In the present invention, a first water spraying device provided in the primary mixer sprays water on the sintering raw materials. The water spraying treatment of the first water spraying device is mainly to add water to moisten and mix the sintering raw materials, so that the moisture content, particle size and various components in the sintering mixture are evenly distributed; at the same time, by controlling the amount of water added by the first water spraying device inside the primary mixer, the generation of dust can be further suppressed to ensure the dust emission level of the system. Preferably, before the sintering raw materials enter the primary mixer, the present invention also sprays water on the sintering raw materials through a second water spraying device provided above the feed belt. Generally speaking, the sintering raw materials are discharged from the feed hopper to the feed belt. Dust will be generated during the process of the sintering raw materials from the feed hopper to the feed belt. Dust will also be generated during the process of the sintering raw materials being transported on the feed belt. Therefore, the present invention preferably sprays water on the sintering raw materials through the second water spraying device above the feed end of the feed belt, thereby increasing the moisture content of the sintering raw materials and alleviating dust pollution at the source. After the moisture content of the sintering raw materials on the feed belt is increased, the generation of dust can also be reduced when the sintering raw materials are discharged from the feed belt to the primary mixer. As a result, the dust pollution of the entire system is greatly improved.

[0041] Based on the above-mentioned sintering mixer dust control method, the present invention also proposes a sintering mixer dust control system based on condensation dust removal. The system includes a primary mixer, a feed belt, a first water spray device, a dust removal pipe, and a dust collector. The discharge end of the feed belt extends into the feed port of the primary mixer. A dust removal pipe is provided in the primary mixer above the discharge end of the feed belt. The dust removal pipe passes through the feed port of the primary mixer and is connected to the dust collector provided outside the primary mixer. A first water spray device is provided in the primary mixer. The sintering raw material is discharged into the sintering primary mixer through the feed belt. The dust-containing gas generated during the discharge process enters the dust collector through the dust removal pipe for treatment. The dust collector described in the present invention is not specifically limited, and it only needs to meet the dust removal requirements. For example, the dust collector can be a bag dust collector. The sintering raw material ash collected by the dust collector is returned to the feed belt for recycling.

[0042] In the present invention, the dust removal duct is a double-tube structure, including an outer shell and an inner liner. The internal space of the inner liner constitutes the inner chamber, and the interlayer between the outer shell and the inner liner is the outer chamber. The outer chamber is used to introduce cooling medium and heat medium, and the inner chamber provides an airflow channel for the dust-laden gas. In order to reduce the dust removal load of the dust collector, the cooling medium and heat medium introduced into the outer chamber of the present invention do not enter the dust collector to participate in the dust removal process, so the outer chamber is provided with a heat medium inlet, a heat medium outlet, a cooling medium inlet and a cooling medium outlet. In order to facilitate the cooling medium and the heat medium to exchange heat with the dust-laden gas in the inner chamber during the entire process of entering the outer chamber, the heat medium inlet and the cooling medium inlet are arranged in the upstream section of the outer shell, and the heat medium outlet and the cooling medium outlet are arranged in the downstream section of the outer shell along the direction of the dust-laden gas.

[0043] In the present invention, the dust removal duct is arranged in an arc shape, i.e., an arc-shaped duct. If the dust removal duct is abstracted as a curve along the material conveying direction, the curve conforms to the law of a decreasing function. The closer the dust removal duct is to the dust collector, the more horizontal it becomes, and the closer the dust removal duct is to the air inlet, the more vertical it becomes. This ensures that the large particles of sintered raw material formed by the condensation and growth of dust in the dust-laden gas can fall smoothly back into the primary mixer under the action of gravity. The decreasing function is y = k / x, where k ranges from 1 to 5.

[0044] Another solution is that the dust removal duct includes an air intake section and an exhaust section along the direction of the dust-laden gas. The air intake section is arranged in the primary mixer, one end of the exhaust section is connected to the air intake section, and the other end of the exhaust section is connected to the dust collector through the feed port of the primary mixer. The air intake section is arranged vertically, the exhaust section is arranged in an arc shape, and the arrangement of the exhaust section also conforms to the law of a decreasing function, that is, the dust removal duct in this solution includes a combination of an arc-shaped duct and a vertical duct. The decreasing function is y=k / x, and the value range of k is 1 to 5. Preferably, in order to facilitate the large-particle sintered raw materials formed by the condensation and growth of dust in the dust-laden gas to fall back into the primary mixer, the air intake end of the dust removal duct can also be set to a funnel shape.

[0045] More preferably, a dust collecting hood is provided in the primary mixer, and the dust collecting hood can be respectively provided at the air inlet end of the above two types of dust removal ducts.

[0046] In the present invention, a first water spraying device is provided with a first water spraying amount detection device for controlling the amount of water sprayed by the first water spraying device inside the primary mixer. A second water spraying amount detection device is provided on the second water spraying device for controlling the amount of water sprayed by the second water spraying device on the feed belt. A first moisture detection device and a second moisture detection device are provided at the feed port 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 simultaneously performs real-time detection of the moisture content of the inlet and outlet of the primary mixer. Based on the above real-time detection results, the mixing effect and dust control situation of the primary mixer are evaluated, and accordingly, the direction of the dust removal pipeline, the temperature of the cooling medium and the heat medium, and the water spraying amount of each water spraying device are adjusted in a coordinated manner, thereby effectively solving the dust pollution problem while ensuring the mixing effect.

[0047] The present invention has requirements for the moisture content of the materials at the feed inlet and the discharge port of the primary mixer according to the sintering process. Among them, the moisture content of the materials at the feed inlet of the primary mixer is ≤6%, preferably ≤5%, more preferably ≤4%. The moisture content of the materials at the discharge port of the primary mixer is <15%, preferably <12%, 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 1g / m 3 , preferably <0.9g / m 3 , more preferably <0.8g / m 3 .

[0048] Compared with the prior art, the present invention has the following beneficial technical effects:

[0049] 1. The dust removal pipe in the present invention is set as 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 cooling medium is introduced into the outer chamber, so that the dust in the dust-laden gas condenses and grows to form large-particle sintering raw materials. The large-particle sintering raw materials fall back into the primary mixer through the dust removal pipe, thereby greatly reducing the dust concentration of the sintering primary mixer system and solving the problem of serious dust pollution in the sintering mixer system.

[0050] 2. The outer chamber of the dust removal pipe in the present invention is periodically and alternately introduced with cooling medium and heat medium. The introduction of cooling medium causes the dust in the dust-laden gas to condense and grow to form large-particle sintering raw materials. The introduction of heat medium can ensure that the large-particle sintering raw materials fall back into the primary mixer through the dust removal pipe, thereby greatly reducing the dust concentration of the sintering primary mixer system, alleviating the dust removal load of the system's end dust collector, and also solving the problem of easy hardening and clogging of the dust removal pipe in the prior art.

[0051] 3. The introduction of heat medium into the outer chamber of the dust removal pipe in the present invention can also increase the temperature of the dust-containing gas in the dust removal pipe, so that the temperature of the dust-containing gas is maintained above the dew point temperature while the heat medium is introduced, so as to avoid the generation of condensed water, effectively prevent hardening, and avoid blockage of the dust removal pipe.

[0052] 4. The dust removal duct in the system of the present invention can be set in various forms such as an arc duct or a combination of an arc duct and a vertical duct, and the arc duct conforms to the law of a decreasing function, thereby ensuring that the large-particle sintering raw materials formed by the condensation and growth of dust in the dust-laden gas can smoothly fall back into the primary mixer under the action of gravity.

[0053] 5. The present invention adds a water spray point above the feed end of the feed belt to increase the humidity of the material, alleviate dust pollution from the source, greatly reduce the generation of dust when the material is discharged from the feed funnel to the feed belt, and effectively inhibit the generation of dust during the transportation of the material on the feed belt, thereby improving the dust pollution problem in the sintering primary mixing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic structural diagram of a sintering mixer dust control system based on condensation-type dust removal according to the present invention;

[0055] Figure 2 This is a schematic structural diagram of another sintering mixer dust control system based on condensation-type dust removal according to the present invention;

[0056] Figure 3 A schematic diagram of the structure of the dust removal pipeline in the present invention;

[0057] Figure 4This is another structural schematic diagram of the dust removal pipeline in the present invention.

[0058] Reference numerals:

[0059] 1: primary mixer; 2: feeding belt; 3: first water spraying device; 4: dust removal duct; 401: inner chamber; 402: outer chamber; 403: outer shell; 404: liner; 405: heat medium inlet; 406: heat medium outlet; 407: cooling medium inlet; 408: cooling medium outlet; 5: dust collector; 6: second water spraying device; 7: chimney; 8: dust hood; 901: first water spraying amount detection device; 902: second water spraying amount detection device; 1001: first moisture detection device; 1002: second moisture detection device; 11: dust concentration detection device; 12: exhaust fan; 13: gas exhaust duct; 14: feeding funnel. DETAILED DESCRIPTION

[0060] According to a second embodiment of the present invention, a sintering mixer dust control system based on condensation-type dust removal is provided.

[0061] A sintering mixer dust control system based on condensation-type dust removal or a sintering mixer dust control system used for the method described in the first embodiment, the system comprising a primary mixer 1, a feed belt 2, a first water spray device 3, a dust removal pipe 4, and a dust collector 5. The discharge end of the feed belt 2 extends into the feed port of the primary mixer 1. A dust removal pipe 4 is provided in the primary mixer 1 above the discharge end of the feed belt 2. The dust collector 5 is provided on the outside of the primary mixer 1. The dust removal pipe 4 passes through the feed port of the primary mixer 1 and is connected to the dust collector 5. The dust removal pipe 4 is a double-tube structure. A first water spray device 3 is provided in the primary mixer 1.

[0062] In the present invention, the dust removal duct 4 includes an outer shell 403 and an inner liner 404. The interior space of the inner liner 404 constitutes an inner chamber 401. An outer chamber 402 is formed between the outer shell 403 and the inner liner 404. The outer chamber 402 is provided with a heat medium inlet 405, a heat medium outlet 406, a cooling medium inlet 407, and a cooling medium outlet 408.

[0063] Preferably, along the direction of the dust-laden gas, the heat medium inlet 405 and the cooling medium inlet 407 are arranged at the upstream section of the housing 403 , and the heat medium outlet 406 and the cooling medium outlet 408 are arranged at the downstream section of the housing 403 .

[0064] In the present invention, the dust removal pipe 4 is arranged in an arc shape and along the material conveying direction, and the arrangement of the dust removal pipe 4 complies with the law of a decreasing function.

[0065] In the present invention, the dust removal duct 4 includes an air intake section and an exhaust section. The air intake section is disposed within the primary mixer 1, one end of the exhaust section is connected to the air intake section, and the other end of the exhaust section passes through the feed port of the primary mixer 1 and is connected to the dust collector 5. The air intake section is disposed vertically, and the exhaust section is disposed in an arc shape, and the arrangement of the exhaust section conforms to the law of a decreasing function. Preferably, the air intake end of the dust removal duct 4 is funnel-shaped.

[0066] Preferably, a dust hood 8 is further provided in the primary mixer 1. The dust hood 8 is connected to the air inlet end of the dust removal duct 4 and is located above the discharge end of the feed belt 2.

[0067] Preferably, the system further comprises a second water spraying device 6. The second water spraying device 6 is arranged above the feed belt 2. Preferably, the second water spraying device 6 is located above the feed end of the feed belt 2.

[0068] Preferably, the first water spraying device 3 is provided with a first water spraying amount detection device 901. The second water spraying device 6 is provided with a second water spraying amount detection device 902.

[0069] Preferably, a first moisture detection device 1001 is provided at the feed inlet of the primary mixer 1 .

[0070] Preferably, a second moisture detection device 1002 is provided at the discharge port of the primary mixer 1 .

[0071] Preferably, a dust concentration detection device 11 is provided at the gas inlet of the dust collector 5 .

[0072] In the present invention, the system further comprises an exhaust fan 12 and a chimney 7. The gas outlet of the dust collector 5 is connected to the chimney 7 via a gas exhaust duct 13. The exhaust fan 12 is provided on the gas exhaust duct 13.

[0073] In the present invention, the system further comprises a feeding funnel 14. The feeding funnel 14 is arranged above the feeding end of the feeding belt 2.

[0074] Example 1

[0075] like Figure 1 As shown, a sintering mixer dust control system based on condensation dust removal includes a primary mixer 1, a feed belt 2, a first water spray device 3, a dust removal pipe 4, and a dust collector 5. The discharge end of the feed belt 2 extends into the feed port of the primary mixer 1. A dust removal pipe 4 is provided in the primary mixer 1 above the discharge end of the feed belt 2. The dust collector 5 is arranged on the outside of the primary mixer 1. The dust removal pipe 4 passes through the feed port of the primary mixer 1 and is connected to the dust collector 5. The dust removal pipe 4 is a double-tube structure. A first water spray device 3 is provided in the primary mixer 1. The dust collector 5 is a bag dust collector.

[0076] Example 2

[0077] like Figure 3 As shown, Example 1 is repeated, except that the dust removal duct 4 includes an outer shell 403 and an inner liner 404. The interior space of the inner liner 404 constitutes an inner chamber 401. An outer chamber 402 is formed between the outer shell 403 and the inner liner 404. The outer chamber 402 is provided with a heat medium inlet 405, a heat medium outlet 406, a cooling medium inlet 407, and a cooling medium outlet 408.

[0078] Example 3

[0079] Example 2 is repeated, except that the heat medium inlet 405 and the cooling medium inlet 407 are arranged at the upstream section of the housing 403 along the direction of the dust-laden gas, and the heat medium outlet 406 and the cooling medium outlet 408 are arranged at the downstream section of the housing 403 .

[0080] Example 4

[0081] Example 3 is repeated, except that the dust removal pipe 4 is arranged in an arc shape and along the material conveying direction. The arrangement of the dust removal pipe 4 complies with the law of a decreasing function.

[0082] Example 5

[0083] like Figure 2 and 4 As shown, a sintering mixer dust control system based on condensation dust removal includes a primary mixer 1, a feed belt 2, a first water spray device 3, a dust removal pipe 4, and a dust collector 5. The discharge end of the feed belt 2 extends into the feed port of the primary mixer 1. A dust removal pipe 4 is provided in the primary mixer 1 above the discharge end of the feed belt 2. The dust collector 5 is arranged on the outside of the primary mixer 1. The dust removal pipe 4 passes through the feed port of the primary mixer 1 and is connected to the dust collector 5. The dust removal pipe 4 is a double-tube structure. A first water spray device 3 is provided in the primary mixer 1. The dust collector 5 is a bag dust collector.

[0084] The dust removal duct 4 includes an outer shell 403 and an inner liner 404. The interior space of the inner liner 404 forms an inner chamber 401. An outer chamber 402 is formed between the outer shell 403 and the inner liner 404. The outer chamber 402 is provided with a heat medium inlet 405, a heat medium outlet 406, a cooling medium inlet 407, and a cooling medium outlet 408.

[0085] Along the direction of the dust-laden gas, the heat medium inlet 405 and the cooling medium inlet 407 are arranged at the upstream section of the housing 403 , and the heat medium outlet 406 and the cooling medium outlet 408 are arranged at the downstream section of the housing 403 .

[0086] The dust removal duct 4 includes an air intake section and an exhaust section. The air intake section is disposed within the primary mixer 1. One end of the exhaust section is connected to the air intake section, and the other end of the exhaust section passes through the feed port of the primary mixer 1 and is connected to the dust collector 5. The air intake section is disposed vertically, while the exhaust section is disposed in an arc shape. The arrangement of the exhaust section conforms to the law of a decreasing function.

[0087] Example 6

[0088] Example 5 is repeated, except that the air inlet end of the dust removal pipe 4 is funnel-shaped.

[0089] Example 7

[0090] Repeat Example 4, except that a dust hood 8 is further provided in the primary mixer 1. The dust hood 8 is connected to the air inlet end of the dust removal duct 4 and is located above the discharge end of the feed belt 2.

[0091] Example 8

[0092] Repeat Example 7, except that the system further includes a second water spraying device 6. The second water spraying device 6 is arranged above the feeding end of the feeding belt 2.

[0093] Example 9

[0094] The embodiment 8 is repeated, except that the first water spraying device 3 is provided with a first water spraying amount detection device 901. The second water spraying device 6 is provided with a second water spraying amount detection device 902.

[0095] Example 10

[0096] Example 9 is repeated, except that a first moisture detection device 1001 is provided at the feed inlet of the primary mixer 1 .

[0097] Example 11

[0098] Example 10 is repeated, except that a second moisture detection device 1002 is provided at the discharge port of the primary mixer 1 .

[0099] Example 12

[0100] Example 11 is repeated, except that a dust concentration detection device 11 is provided at the gas inlet of the dust collector 5.

[0101] Example 13

[0102] Example 12 is repeated except that the system further includes an exhaust fan 12 and a chimney 7. The gas outlet of the dust collector 5 is connected to the chimney 7 via a gas exhaust duct 13. The exhaust fan 12 is provided on the gas exhaust duct 13.

[0103] Example 14

[0104] Example 13 is repeated, except that the system further includes a feeding funnel 14. The feeding funnel 14 is arranged above the feeding end of the feeding belt 2.

[0105] Example 15

[0106] A sintering mixer dust control method based on condensation dust removal, using the system of Example 14, the method comprising the following steps:

[0107] 1) The sintering raw materials are transported to the primary mixer 1 through the feeding belt 2.

[0108] 2) The first water spraying device 3 provided in the primary mixer 1 sprays water on the sintering raw materials, and the sintering raw materials are mixed in the primary mixer 1 to obtain a sintered mixed material.

[0109] 3) Within the primary mixer 1, a double-tube dust removal duct 4 is provided above the unloading position of the feed conveyor 2. Dust-laden gas generated during the unloading process enters the dust collector 5 through the inner chamber 401 of the dust removal duct 4 for treatment. Simultaneously, a cooling medium is introduced into the outer chamber 402 of the dust removal duct 4.

[0110] Example 16

[0111] A sintering mixer dust control method based on condensation dust removal, using the system of Example 14, the method comprising the following steps:

[0112] 1) The sintering raw materials are transported to the primary mixer 1 through the feeding belt 2.

[0113] 2) The first water spraying device 3 provided in the primary mixer 1 sprays water on the sintering raw materials, and the sintering raw materials are mixed in the primary mixer 1 to obtain a sintered mixed material.

[0114] 3) Within the primary mixer 1, a double-tube dust removal duct 4 is provided above the unloading position of the feed conveyor 2. Dust-laden gas generated during the unloading process enters the dust collector 5 through the inner chamber 401 of the dust removal duct 4 for treatment. Simultaneously, the outer chamber 402 of the dust removal duct 4 is periodically and alternately fed with a cooling medium and a heating medium.

[0115] Example 17

[0116] A sintering mixer dust control method based on condensation dust removal, using the system of Example 14, the method comprising the following steps:

[0117] 1) The second water spraying device 6 arranged above the feed belt 2 sprays water on the sintering raw materials, and the sintering raw materials after the water spraying are transported to the primary mixer 1 through the feed belt 2.

[0118] 2) The first water spraying device 3 provided in the primary mixer 1 sprays water on the sintering raw materials, and the sintering raw materials are mixed in the primary mixer 1 to obtain a sintered mixed material.

[0119] 3) In the primary mixer 1, a double-tube dust removal pipe 4 is provided above the unloading position of the feed belt 2. The dust-laden gas generated during the unloading process enters the dust collector 5 for treatment through the inner chamber 401 of the dust removal pipe 4. At the same time, the cooling medium and the heat medium are periodically and alternately introduced into the outer chamber 402 of the dust removal pipe 4. In the process of introducing the cooling medium, the dust in the dust-laden gas condenses and grows to form large-particle sintered raw materials. Among them, a part of the large-particle sintered raw materials falls back into the primary mixer 1 through the dust removal pipe 4, and the other part of the large-particle sintered raw materials adheres to the inner wall of the dust removal pipe 4. In the process of introducing the heat medium, the large-particle sintered raw materials adhered to the inner wall of the dust removal pipe 4 fall off after heating, and then fall back into the primary mixer 1.

[0120] 4) The dust-laden gas entering the dust collector 5 is purified and then discharged to the chimney 7.

[0121] 5) During the dust removal process, the sintered raw material ash collected by the dust collector 5 is returned to the feed belt 2.

[0122] Example 18

[0123] Example 17 was repeated, except that in a single cycle in which the cooling medium and the heating medium were alternately introduced into the outer chamber 402 of the dust removal duct 4, the duration of the cooling medium introduction was longer than the duration of the heating medium introduction. In a single cycle, the duration of the cooling medium introduction was 20 seconds, and the duration of the heating medium introduction was 1 second.

[0124] Example 19

[0125] Example 17 was repeated, except that in a single cycle in which the cooling medium and the heating medium were alternately introduced into the outer chamber 402 of the dust removal duct 4, the duration of the cooling medium introduction was longer than the duration of the heating medium introduction. In a single cycle, the duration of the cooling medium introduction was 40 seconds, and the duration of the heating medium introduction was 3 seconds.

[0126] Example 20

[0127] Example 18 was repeated, except that the temperature of the cooling medium was lower than the dew point temperature of the dust-laden gas. The temperature of the cooling medium was 20° C. The cooling medium was cooling air.

[0128] Example 21

[0129] Example 20 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 150° C., and the heat medium was hot air.

[0130] Example 22

[0131] Example 21 was repeated, except that the moisture content of the material at the feed inlet of the primary mixer 1 was ≤6% and the moisture content of the material at the discharge outlet of the primary mixer 1 was <15%.

[0132] Example 23

[0133] Repeat Example 22, except that the dust concentration of the dust-laden gas at the gas inlet of the dust collector 5 is less than 1 g / m 3 .

[0134] Application Example 1

[0135] The system described in Example 14 was used to control the dust generated in the sintering primary mixer system. The dust concentration was detected by the dust concentration detection device at the gas inlet of the dust collector, and the dust concentration at the gas inlet of the dust collector was 0.2 g / m 3 After being processed by the dust collector, the dust concentration is 6mg / m 3 , that is, it can achieve ultra-low dust emissions.

[0136] Application Example 2

[0137] The system described in Example 6 was used to control the dust generated in the sintering primary mixer system. The dust concentration at the gas inlet of the dust collector was detected by a dust concentration detection device, and the dust concentration at the gas inlet of the dust collector was 0.3 g / m 3 After being processed by the dust collector, the dust concentration is 9mg / m 3 , that is, it can achieve ultra-low dust emissions.

[0138] Therefore, the method and system of the present invention allow the large-particle sintering raw materials formed by the condensation and growth of dust in the dust removal pipeline to basically fall back into the primary mixer, greatly reducing the dust concentration of the sintering primary mixer system, alleviating the dust removal load of the system's end dust collector, solving the problem of serious dust pollution in the sintering mixer system, and avoiding the problem of dust removal pipeline being easily compacted and blocked in the existing technology.

Claims

1. A sintering mixer dust control method based on condensation dust removal, the method comprising the following steps: 1) The sintering raw materials are transported to the primary mixer (1) via a feed belt (2); 2) a first water spraying device (3) provided in the primary mixer (1) sprays water on the sintering raw materials, and the sintering raw materials are mixed in the primary mixer (1) to obtain a sintered mixed material; 3) In the primary mixer (1), a double-tube dust removal pipe (4) is provided above the unloading position of the feed belt (2). The dust-laden gas generated during the unloading process enters the dust collector (5) through the inner chamber (401) of the dust removal pipe (4) for treatment; at the same time, a cooling medium is introduced into the outer chamber (402) of the dust removal pipe (4).

2. The dust control method according to claim 1, characterized in that: In step 3), a cooling medium and a hot medium are periodically and alternately introduced into the outer chamber (402) of the dust removal pipe (4); during the introduction of the cooling medium, dust in the dust-laden gas condenses and grows to form large-particle sintered raw materials; a portion of the large-particle sintered raw materials falls back into the primary mixer (1) via the dust removal pipe (4), and another portion of the large-particle sintered raw materials adheres to the inner wall of the dust removal pipe (4); during the introduction of the hot medium, the large-particle sintered raw materials adhered to the inner wall of the dust removal pipe (4) fall off due to heating, and thus fall back into the primary mixer (1).

3. The dust control method according to claim 2, characterized in that: In a single cycle in which the cooling medium and the heating medium are alternately introduced into the outer chamber (402) of the dust removal duct (4), the duration of the introduction of the cooling medium is greater than or equal to the duration of the introduction of the heating medium.

4. The dust control method according to claim 3, characterized in that: In a single cycle, the duration of the cooling medium being introduced is 2 to 60 seconds; in a single cycle, the duration of the heating medium being introduced is 0.1 to 10 seconds.

5. The dust control method according to claim 4, characterized in that: In a single cycle, the duration of the cooling medium being introduced is 3 to 40 seconds; in a single cycle, the duration of the heating medium being introduced is 0.5 to 8 seconds.

6. The dust control method according to claim 5, characterized in that: In a single cycle, the duration of the cooling medium being introduced is 5 to 20 seconds; in a single cycle, the duration of the heating medium being introduced is 1 to 5 seconds.

7. The dust control method according to claim 2, characterized in that: The temperature of the cooling medium is lower than the dew point temperature of the dust-laden gas; and / or The temperature of the heat medium is higher than the dew point temperature of the dust-laden gas.

8. The dust control method according to claim 7, characterized in that: The temperature of the cooling medium is 0~60℃; and / or The temperature of the heat medium is 100~300℃.

9. The dust control method according to claim 8, characterized in that: The temperature of the cooling medium is 5-50°C; and / or The temperature of the heat medium is 120~280℃.

10. The dust control method according to claim 9, characterized in that: The temperature of the cooling medium is 10-30°C; and / or The temperature of the heat medium is 150~250℃.

11. The dust control method according to claim 2, characterized in that: The cooling medium is cooling air or cooling water; and / or The heat medium is hot air or hot water.

12. The dust control method according to any one of claims 1 to 11, characterized in that: In step 1), before the sintering raw materials enter the primary mixer (1), the sintering raw materials are subjected to water spraying treatment by a second water spraying device (6) arranged above the feed belt (2).

13. The dust control method according to any one of claims 1 to 11, characterized in that: The method further includes: 4) The dust-laden gas entering the dust collector (5) is purified and then discharged to the chimney (7); 5) During the dust removal process, the sintered raw material ash collected by the dust collector (5) is returned to the feed belt (2).

14. The dust control method according to any one of claims 1 to 11, characterized in that: The moisture content of the material at the feed port of the primary mixer (1) is ≤6%; the moisture content of the material at the discharge port of the primary mixer (1) is <15%; and / or The dust concentration of the dust-laden gas at the gas inlet of the dust collector (5) is less than 1g / m 3 .

15. The dust control method according to claim 14, characterized in that: The moisture content of the material at the feed port of the primary mixer (1) is ≤5%; the moisture content of the material at the discharge port of the primary mixer (1) is <12%; and / or The dust concentration of the dust-laden gas at the gas inlet of the dust collector (5) is less than 0.9g / m 3 .

16. The dust control method according to claim 15, characterized in that: The moisture content of the material at the feed port of the primary mixer (1) is ≤4%; the moisture content of the material at the discharge port of the primary mixer (1) is <10%; and / or The dust concentration of the dust-laden gas at the gas inlet of the dust collector (5) is less than 0.8g / m 3 .

17. A sintering mixer dust control system for the method according to any one of claims 1 to 16, the system comprising a primary mixer (1), a feed belt (2), a first water spray device (3), a dust removal pipe (4), and a dust collector (5); the discharge end of the feed belt (2) extends into the feed port of the primary mixer (1); a dust removal pipe (4) is provided in the primary mixer (1) above the discharge end of the feed belt (2); the dust collector (5) is provided on the outside of the primary mixer (1); the dust removal pipe (4) passes through the feed port of the primary mixer (1) and is connected to the dust collector (5); the dust removal pipe (4) is a double-tube structure; and a first water spray device (3) is provided in the primary mixer (1).

18. The dust control system according to claim 17, characterized in that: The dust removal duct (4) comprises an outer shell (403) and an inner liner (404); the internal space of the inner liner (404) constitutes an inner chamber (401); an outer chamber (402) is formed between the outer shell (403) and the inner liner (404); and the outer chamber (402) is provided with a heat medium inlet (405), a heat medium outlet (406), a cooling medium inlet (407), and a cooling medium outlet (408).

19. The dust control system according to claim 18, characterized in that: Along the direction of the dust-laden gas, the heat medium inlet (405) and the cooling medium inlet (407) are arranged at the upstream section of the shell (403); and the heat medium outlet (406) and the cooling medium outlet (408) are arranged at the downstream section of the shell (403).

20. The dust control system according to any one of claims 17 to 19, characterized in that: The dust removal duct (4) is arranged in an arc shape and along the material conveying direction, and the arrangement of the dust removal duct (4) complies with the law of a decreasing function; or The dust removal duct (4) comprises an air intake section and an exhaust section; the air intake section is arranged in the primary mixer (1), one end of the exhaust section is connected to the air intake section, and the other end of the exhaust section passes through the feed port of the primary mixer (1) and is connected to the dust collector (5); the air intake section is arranged vertically, the exhaust section is arranged in an arc shape, and the arrangement of the exhaust section complies with the law of a decreasing function.

21. The dust control system according to claim 20, characterized in that: The air inlet end of the dust removal pipe (4) is funnel-shaped.

22. The dust control system according to claim 20, characterized in that: A dust hood (8) is also provided in the primary mixer (1); the dust hood (8) is connected to the air inlet end of the dust removal pipe (4) and is located above the discharge end of the feed belt (2).

23. The dust control system according to any one of claims 17-19, 21-22, characterized in that: The system further comprises a second water spraying device (6); the second water spraying device (6) is arranged above the feed belt (2).

24. The dust control system according to claim 23, characterized in that: The second water spraying device (6) is located above the feed end of the feed belt (2).

25. The dust control system according to claim 23, characterized in that: The first water spraying device (3) is provided with a first water spraying amount detection device (901); the second water spraying device (6) is provided with a second water spraying amount detection device (902).

26. The dust control system according to any one of claims 17-19, 21-22, 24-25, characterized in that: A first moisture detection device (1001) is provided at the feed inlet of the primary mixer (1); and / or A second moisture detection device (1002) is provided at the discharge port of the primary mixer (1); and / or A dust concentration detection device (11) is provided at the gas inlet of the dust collector (5).

27. The dust control system according to any one of claims 17-19, 21-22, 24-25, characterized in that: The system further comprises an exhaust fan (12) and a chimney (7); the gas outlet of the dust collector (5) is connected to the chimney (7) via a gas exhaust pipe (13); the exhaust fan (12) is arranged on the gas exhaust pipe (13); and / or The system further comprises a feed funnel (14); the feed funnel (14) is arranged above the feed end of the feed belt (2).

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