Method for treating dusty gas

Abstract

The invention relates to the technical field of process dust removal, and discloses a method for treating dusty gas. The method comprises the steps that an upper air column and a lower air column are adopted for supplying air to obtain annular dust-containing airflow, then a dust-containing gas collecting unit is adopted for collecting the annular dust-containing airflow, and then the annular dust-containing airflow is conveyed into a dust removal unit for treatment to obtain purified gas; one part of the purified gas is conveyed into the heating air supply device to be heated and then returns to the lower air column to be recycled, and the other part of the purified gas is conveyed into the pressurizing air supply device to be pressurized and then returns to the upper air column to be recycled. According to the method, the dust-containing gas can be treated, and meanwhile, the treatment energy consumption can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of process dust removal, and in particular to a method for treating dust-laden gas. Background Art

[0002] In the power, coal, and transportation industries, during the slag storage, ash storage, coal yard loading and unloading, and ship unloader grab bucket unloading, high-concentration, strong shear airflow and dust are generated in a certain space due to the scattering of materials, falling impact, and other reasons, causing serious environmental pollution. For this type of unorganized dust control, existing technical means mostly use dry fog / high-pressure micro-mist dust suppression, etc. However, engineering experience shows that dry fog and micro-mist dust suppression technologies have many limitations for space dust control, specifically: (1) When the dust suppression system is working, white water vapor fills the air, reducing visibility in the space, affecting work safety and data collection (video reading parameters, etc.); (2) When the water mist particle size is small (particle size < 20μm), the water mist "suppression" effect is very limited, and the dust-laden airflow can easily break through, resulting in limited dust suppression effect. When the water mist particle size is large (particle size > 20μm), it affects the moisture content of the material; (3) When the dust suppression system is operated for a long period of time, the corrosion of the structures and equipment in the space is aggravated due to the increase in environmental humidity.

[0003] The management of dust-laden air in spaces requires a systematic approach, employing a combination of dust suppression (water mist) and dust removal (negative pressure induction). Negative pressure induction dust removal in spaces addresses not only the localized dust generation at a single dust source but also the generation of dust over large working surfaces, with the rapid diffusion of dust-laden airflow. Using traditional negative pressure extraction methods would require enormous volumes of extracted air, a large processing system, and high investment and energy consumption. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems existing in the prior art such as the difficulty in recycling and treating dust-laden gas in the space, and to provide a method for treating dust-laden gas. This method can utilize airflow guidance to significantly reduce the amount of dust-laden gas collected, and utilize a high-efficiency dust removal device to achieve the recycling of clean gas, thereby achieving the treatment of dust-laden gas while also significantly reducing treatment energy consumption.

[0005] In order to achieve the above object, the present invention provides a method for treating dust-laden gas, wherein the method is implemented in a dust-laden gas treatment system, wherein the dust-laden gas treatment system includes an air supply unit, a dust-laden gas collection unit, a dust removal unit, and a gas recycling unit;

[0006] The air supply unit includes at least three air supply columns arranged around the dust-generating surface, the air supply columns are divided into upper air columns and lower air columns, and the gas recycling unit includes a heating air supply device and a pressurized air supply device;

[0007] The method comprises: using the upwind column and the downwind column to supply air respectively to obtain an annular dust-laden airflow, then using the dust-laden gas collection unit to collect the annular dust-laden airflow, and then transporting it to the dust removal unit for treatment to obtain clean gas; transporting part of the clean gas to the heating air supply device for heating, and then returning it to the downwind column for reuse, and transporting another part of the clean gas to the pressurized air supply device for pressurization, and then returning it to the upwind column for reuse;

[0008] Wherein, in the counterclockwise direction, the angle ɑ between the connecting line L between the air supply column and the adjacent air supply column and the air outlet direction of the air supply column is less than 60°;

[0009] The air supply temperature of the downwind column is higher than the air supply temperature of the upwind column, and the air supply speed of the upwind column is higher than the air supply speed of the downwind column;

[0010] The lowest air outlet point a of the upwind column is higher than the highest point A of the dust-generating surface, and the lowest air outlet point b of the downwind column is higher than the lowest point B of the dust-generating surface.

[0011] Preferably, the air supply temperature of the downwind column is 5-20° C. higher than that of the upwind column, and the air supply speed of the upwind column is 5-10 m / s higher than that of the downwind column.

[0012] Preferably, the lowest air outlet point a of the upwind column is 0.3-2 m higher than the highest point A of the dust-generating surface, and the lowest air outlet point b of the downwind column is 0.1-1.5 m higher than the lowest point B of the dust-generating surface.

[0013] Preferably, in the counterclockwise direction, the angle ɑ between the connecting line L between the air supply column and the adjacent air supply column and the air outlet direction of the air supply column is less than 45°, preferably 20-35°.

[0014] Preferably, the dust-laden gas collection unit is provided with a monitoring device, a control device, a driving device, a negative pressure gas collecting device and a sliding rod, and the negative pressure gas collecting device is connected to the sliding rod through the driving device;

[0015] The method further includes: using a monitoring device to collect information about the dust-laden airflow, and then the control device controls the driving device according to the information collected by the monitoring device, and adjusts the position of the negative pressure air collection device through the driving device.

[0016] Preferably, the monitoring device is used to collect turbulence intensity and wind shear parameters of the dust-laden airflow.

[0017] Preferably, the installation height of the monitoring device is 3-4 m higher than the highest point A of the dust-generating surface.

[0018] Preferably, the negative pressure air collecting device is connected to the dust removal unit through a telescopic pipe.

[0019] Preferably, the dust removal unit includes a high-efficiency dust collector and an ash storage box; the high-efficiency dust collector is used to perform dust removal on the dust-laden airflow to obtain clean gas and dust, and the dust is transported to the ash storage box for storage.

[0020] Preferably, a guide device is provided at the air outlet of the air supply column for adjusting the angle ɑ.

[0021] In the method described in the present invention, the air supply columns used are divided into upwind columns and downwind columns. By further setting the angle of the air outlet direction of the air supply columns, the temperature difference between the air supply temperature of the upwind column and the air supply temperature of the downwind column, the difference between the air supply speed of the upwind column and the air supply speed of the downwind column, and the height relationship between the upwind column and the downwind column and the dust-raising surface, a counterclockwise or clockwise annular airflow can be formed between the air supply columns. The annular airflow absorbs and entrains dust and continuously rotates and shrinks (rotating and flowing), forming a "tornado" or "dragon sucking water" effect. After the final contraction is completed, the annular dust-laden airflow enters the negative pressure air collection hood, and then enters the dust removal unit for treatment to obtain clean gas. The obtained clean gas is then divided into two streams and transported to the upwind column and the downwind column respectively, realizing the recycling of gas in the space without extracting gas from the outside, further reducing the processing cost.

[0022] The method described in the present invention can achieve efficient treatment of dust-laden gas within enclosed spaces. This method breaks through traditional negative pressure extraction methods and cleverly utilizes airflow guidance to significantly reduce the amount of dust-laden gas collected, lowering treatment system investment while also achieving excellent treatment results and a high dust removal rate. Furthermore, by purifying the dust-laden gas within the space and then recycling it, the method can effectively reduce heat loss within the space, significantly reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic flow diagram of the dust-laden gas treatment system adopted in the present invention;

[0024] Figure 2 Schematic diagram of the arrangement of air supply columns and a schematic diagram of the connecting line L and the angle ɑ in a specific embodiment of the present invention;

[0025] Figure 3 A schematic structural diagram of the air supply column according to the present invention.

[0026] Description of Reference Numerals

[0027] 101 air supply column; 101a upwind column; 101b downwind column; 112 monitoring device; 113 control device; 111 driving device; 102 negative pressure air collecting device; 114 sliding rod; 103 high-efficiency dust collector; 104 dust storage box; 105 heating air supply device; 106 pressurized air supply device; 107 first air supply duct; 108 second air supply duct; 115 dust lifting surface; 110 telescopic duct; 109 annular dust-laden airflow; 120 third air supply duct. DETAILED DESCRIPTION

[0028] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0029] The endpoints of the ranges and any values disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0030] The present invention first provides a dust-laden gas treatment system, the flow diagram of the dust-laden gas treatment system is combined with reference to Figure 1 The dust-laden gas treatment system includes an air supply unit, a dust-laden gas collection unit, a dust removal unit and a gas recycling unit.

[0031] Specifically, the air supply unit is used to supply air and form an annular airflow, and the annular airflow is used to absorb and entrain dust to obtain an annular dust-laden airflow 109. The air supply unit includes at least three air supply columns 101 arranged around the dust-generating surface 115. The air supply columns 101 are divided into an upper air column 101a and a lower air column 101b. The structural diagram of the air supply column 101 can be combined with reference to Figure 3 The upwind column 101a and the downwind column 101b are isolated from each other, and the upwind column 101a and the downwind column 101b respectively supply air to achieve stratified air supply, further forming a ring-shaped dust-laden airflow 109, thereby completely absorbing and processing the dust-laden gas in the space. In the present invention, the dust-generating surface 115 refers to the contact surface between the piled material and the external air.

[0032] Specifically, the dust-laden gas collection unit is used to collect the annular dust-laden airflow 109 and transport the collected airflow to the dust removal unit for dust removal.

[0033] In some preferred embodiments, in order to further completely collect the annular dust-laden airflow 109, the dust-laden gas collection unit is provided with a monitoring device 112, a control device 113, a driving device 111, a negative pressure gas collecting device 102 and a sliding rod 114, and the negative pressure gas collecting device 102 is connected to the sliding rod 114 through the driving device 111, that is, the negative pressure gas collecting device 102 is a movable device in the system described in the present invention, and can be moved to the optimal position for collection according to the specific information of the annular dust-laden gas formed by the air supply column 101.

[0034] Among them, the monitoring device 112 is used to accurately measure the turbulence intensity and wind shear parameters of the annular dust-laden airflow 109, and further transmit the collected data to the control device 113 via wireless; the control device 113 is used to receive the data collected by the monitoring device 112, and further, through computational learning, issue instructions to the driving device 111 based on the collected data; after receiving the instructions issued by the control device 113, the driving device 111 drives the negative pressure gas collection device 102 to move along the sliding rod 114 according to the instructions and stay in the optimal position. Through the mutual cooperation between the monitoring device 112, the control device 113, the driving device 111 and the negative pressure gas collection device 102, the annular dust-laden airflow 109 can be made to enter the negative pressure gas collection hood just in time, thereby achieving the effect of precise suction, further improving the treatment of dust-laden gas in the space, realizing the complete recovery of dust-laden gas, and further improving the dust removal rate, realizing efficient treatment of dust-laden gas.

[0035] In some embodiments, the monitoring device 112 can be a device commonly used in the art for monitoring airflow, such as a laser wind radar; the control device 113 can be a device commonly used in the art for collecting and organizing information, such as an intelligent control platform.

[0036] Specifically, the dust removal unit is used to perform dust removal on the annular dust-laden airflow 109 collected from the dust-laden gas collecting unit to obtain clean gas and dust.

[0037] In some embodiments, the dust removal unit includes a high-efficiency dust collector 103 and an ash storage box 104, which are interconnected. The high-efficiency dust collector 103 is used to remove dust from the annular dust-laden airflow 109 to obtain clean gas and dust, which is then transported to the ash storage box 104 for storage. Specifically, the high-efficiency dust collector can be a common dust removal device in the art, preferably a dry dust collector, such as a cartridge dust collector or a sintered plate dust collector.

[0038] In some preferred embodiments, in order to completely collect the annular dust-laden airflow 109, the negative pressure air collection device 102 is connected to the high-efficiency dust collector 103 in the dust removal unit via a retractable pipe 110. Specifically, the retractable pipe 110 can be a retractable air extraction arm.

[0039] Specifically, the gas recycling unit includes a heating air supply device 105 and a pressurized air supply device 106. The heating air supply device 105 is used to heat a portion of the clean gas from the high-efficiency dust collector 103 and then transport it to the downwind column 101b for recycling; the pressurized air supply device 106 is used to pressurize another portion of the clean gas from the high-efficiency dust collector 103 and then transport it to the upwind column 101a for recycling.

[0040] In some embodiments, the gas recycling unit further includes a third air supply duct 120 for transporting the clean gas from the high-efficiency dust collector 103 to the heating air supply device 105 and the pressurized air supply device 106 for treatment.

[0041] In some embodiments, the gas recycling unit further includes a first air supply duct 107 and a second air supply duct 108. The first air supply duct 107 is used to transport a portion of the clean gas from the pressurized air supply device 106 to the upwind column 101a for recycling through the first air supply duct 107; the second air supply duct 108 is used to transport a portion of the clean gas from the heated air supply device 105 to the downwind column 101b for recycling through the second air supply duct 108.

[0042] In some embodiments, the heating air supply device 105 may be a hot air blower 105 , and the pressurized air supply device 106 may be a booster blower 106 .

[0043] The present invention also provides a method for treating dust-laden gas implemented in the above-mentioned system, the method comprising: using the upwind column 101a and the downwind column 101b to supply air respectively to obtain an annular dust-laden airflow 109, then using the negative pressure air collection device 102 in the dust-laden gas collection unit to collect the annular dust-laden airflow 109, and then conveying the collected airflow to the high-efficiency dust collector 103 in the dust removal unit for treatment to obtain clean gas and dust, and the dust is conveyed to the ash storage box 104 for storage; conveying part of the clean gas to the heating air supply device 105 through the third air supply duct 120 for heating, and then returning to the downwind column 101b for reuse through the second air supply duct 108, and conveying another part of the clean gas to the pressurized air supply device 106 for pressurization through the third air supply duct 120, and then returning to the upwind column 101a for reuse through the first air supply duct 107.

[0044] In the method of the present invention, in the counterclockwise direction, the connecting line between the air supply column 101 and the adjacent air supply column 101 is L, and the angle ɑ between the connecting line L and the air outlet direction of the air supply column 101 is less than 60° (for a schematic diagram of the connecting line L and the angle ɑ, please refer to Figure 2 ). At the same time, the method of the present invention further defines that the air supply temperature of the downwind column 101b is higher than the air supply temperature of the upwind column 101a, and the air supply speed of the upwind column 101a is higher than the air supply speed of the downwind column 101b; at the same time, it is also necessary to further define that the lowest air outlet point a of the upwind column 101a is higher than the highest point A of the dust-generating surface 115, and the lowest air outlet point b of the downwind column 101b is higher than the lowest point B of the dust-generating surface 115 (for details about the lowest air outlet point a of the upwind column 101a and the lowest air outlet point b of the downwind column 101b, please refer to Figure 1 and Figure 3 The highest point A and the lowest point B of the dust-raising surface 115 can be combined with reference to Figure 1 ).

[0045] In the method described in the present invention, by limiting the angle ɑ between the air outlet direction of the air supply column 101 and the connecting line L, the air supply column 101 can be helped to form an annular airflow, and the annular airflow is used to absorb and entrain dust in the enclosed space. In addition, by further limiting the air supply temperature of the downwind column 101b to be higher than the air supply temperature of the upwind column 101a, a stratified temperature difference is formed, and further limiting the air supply speed of the upwind column 101a to be higher than the air supply speed of the downwind column 101b, a stratified speed difference is formed. The lower layer airflow has a higher temperature and has a lifting effect, and the upper layer airflow has a faster flow rate and has a suction effect on the lower layer airflow. The stratified temperature difference and stratified speed difference are the key to forming an annular airflow and then rotating and flowing. At the same time, further defining the height relationship between the lowest air outlet point a of the upwind column 101a and the highest point A of the dust-generating surface 115, and the height relationship between the lowest air outlet point b of the downwind column 101b and the lowest point B of the dust-generating surface 115, further helps the air supply column 101 form an annular airflow, which helps to completely absorb and process the dust. The parameters defined in the method described in the present invention have a synergistic effect. The lack of any of these parameters will result in the inability to effectively form an annular airflow, thereby reducing the dust removal effect.

[0046] In some preferred embodiments, in the counterclockwise direction, the angle ɑ between the connecting line L between the air supply column 101 and the adjacent air supply column 101 and the air outlet direction of the air supply column 101 is less than 45°, for example, it can be 10-45°, and further preferably, the angle ɑ is 20-35°.

[0047] In some preferred embodiments, the air supply temperature of the leeward column 101b is 5-20°C higher than the air supply temperature of the upwind column 101a, more preferably 8-12°C, and the air supply speed of the upwind column 101a is 5-10m / s higher than the air supply speed of the leeward column 101b, more preferably 5-8m / s. Specifically, the air supply temperature of the leeward column 101b can be 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 13°C, 15°C, 16°C or 18°C higher than the air supply temperature of the upwind column 101a; the air supply speed of the upwind column 101a can be 5m / s, 6m / s, 7m / s, 8m / s, 9m / s or 10m / s higher than the air supply speed of the leeward column 101b.

[0048] In some preferred embodiments, the lowest air outlet point a of the upwind column 101a is 0.3-2m higher than the highest point A of the dust-generating surface 115, more preferably 0.4-1m higher, and the lowest air outlet point b of the downwind column 101b is 0.1-1.5m higher than the lowest point B of the dust-generating surface 115, more preferably 0.8-1.2m higher. Specifically, the lowest air outlet point a of the upwind column 101a can be 0.3m, 0.5m, 0.6m, 0.7m, 0.8m, 0.9m, 1m, 1.2m, 1.5m or 1.8m higher than the highest point A of the dust-generating surface 115; the lowest air outlet point b of the downwind column 101b can be 0.1m, 0.3m, 0.5m, 0.7m, 0.9m, 1m, 1.2m, 1.4m or 1.5m higher than the lowest point B of the dust-generating surface 115.

[0049] In some embodiments, a guide device is provided at the air outlet of the air supply column 101, and the guide device is swingable to adjust the angle ɑ. Preferably, the guide device can be set to a shutter type.

[0050] In some preferred embodiments, in order to ensure that the negative pressure gas collecting device 102 in the dust-laden gas collection unit completely collects the annular dust-laden airflow 109, the method further includes: using a monitoring device 112 to collect the turbulence intensity and wind shear information of the dust-laden airflow, and then the control device 113 sends an instruction to the driving device 111 according to the information collected by the monitoring device 112, and the driving device 111 drives the negative pressure gas collecting device 102 to slide along the slide rod 114 according to the instruction and adjusts it to the optimal absorption position, thereby achieving the effect of precise suction.

[0051] In some preferred embodiments, the installation height of the monitoring device 112 is 3-4 m higher than the highest point A of the dust-generating surface 115 .

[0052] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.

[0053] The process flow chart of the dust-laden gas treatment system used in the following embodiments is combined with reference to Figure 1 , the system includes an air supply unit, a dust-laden gas collection unit, a dust removal unit and a gas recycling unit;

[0054] The air supply unit includes four air supply columns 101 arranged around the dust-raising surface 115. The air supply columns 101 are divided into an upper air column 101a and a lower air column 101b. A guide device is provided at the air outlet of the air supply column 101. The structural diagram of the air supply column 101 can be combined with reference to Figure 3 Among them, the connection line L, the angle ɑ and the placement of the air supply column 101 can be combined with reference to Figure 2 The lowest air outlet point a of the upwind column 101a and the lowest air outlet point b of the downwind column 101b can be found in Figure 1 and Figure 3 The highest point A and the lowest point B of the dust-raising surface 115 can be combined with reference to Figure 1 ;

[0055] The dust-laden gas collection unit is provided with a monitoring device 112, a control device 113, a driving device 111, a negative pressure gas collecting device 102 and a sliding rod 114, and the negative pressure gas collecting device 102 is connected to the sliding rod 114 through the driving device 111;

[0056] In the following embodiments, the monitoring device 112 is a wind radar, and the control device 113 is an intelligent control platform;

[0057] The dust removal unit includes a high-efficiency dust collector 103 and a dust storage box 104 that are connected to each other;

[0058] The negative pressure gas collecting device 102 is connected to the high-efficiency dust collector 103 in the dust removal unit through a retractable pipe;

[0059] The gas recycling unit includes a heating air supply device 105 and a pressurized air supply device 106, and also includes a first air supply duct 107 for connecting the pressurized air supply device 106 and the upwind column 101a, and a second air supply duct 108 for connecting the heating air supply device 105 and the downwind column 101b;

[0060] The gas recycling unit further includes a third air supply duct 120 for transporting the clean gas from the high-efficiency dust collector 103 to the heating air supply device 105 and the pressurized air supply device 106 for treatment.

[0061] Example 1

[0062] The upwind column 101a and the downwind column 101b are used to supply air respectively to obtain an annular dust-laden airflow 109, and then the monitoring device 112 is used to collect the turbulence intensity and wind shear information of the dust-laden airflow. Then, the control device 113 sends an instruction to the driving device 111 according to the information collected by the monitoring device 112. The driving device 111 drives the negative pressure air collecting device 102 to slide along the sliding rod 114 and adjusts it to the optimal absorption position according to the instruction. Then, the negative pressure air collecting device 102 is used to collect the annular dust-laden airflow 109, and then the collected airflow is transported to the high-efficiency dust collector 103 in the dust removal unit for processing to obtain clean gas and dust, and the dust is transported to the ash storage box 104 for storage;

[0063] Part of the clean gas is transported to the heating air supply device 105 through the third air supply duct 120 for heating, and then returned to the downwind column 101b through the second air supply duct 108 for reuse. Another part of the clean gas is transported to the pressurized air supply device 106 through the third air supply duct 120 for pressure boosting, and then returned to the upwind column 101a through the first air supply duct 107 for reuse.

[0064] Among them, the connecting line between the air supply column 101 and the adjacent air supply column 101 is L, and the angle ɑ between the connecting line L and the air outlet direction of the air supply column 101 is 35°; the air supply temperature of the downwind column 101b is 10°C higher than the air supply temperature of the upwind column 101a; the air supply speed of the upwind column 101a is 6m / s higher than the air supply speed of the downwind column 101b; the lowest air outlet point a of the upwind column 101a is 0.5m higher than the highest point A of the dust-generating surface 115; the lowest air outlet point b of the downwind column 101b is 1m higher than the lowest point B of the dust-generating surface 115; the monitoring device 112 is 3.5m higher than the highest point A of the dust-generating surface 115.

[0065] Example 2

[0066] The upwind column 101a and the downwind column 101b are used to supply air respectively to obtain an annular dust-laden airflow 109, and then the monitoring device 112 is used to collect the turbulence intensity and wind shear information of the dust-laden airflow. Then, the control device 113 sends an instruction to the driving device 111 according to the information collected by the monitoring device 112. The driving device 111 drives the negative pressure air collecting device 102 to slide along the sliding rod 114 and adjusts it to the optimal absorption position according to the instruction. Then, the negative pressure air collecting device 102 is used to collect the annular dust-laden airflow 109, and then the collected airflow is transported to the high-efficiency dust collector 103 in the dust removal unit for processing to obtain clean gas and dust, and the dust is transported to the ash storage box 104 for storage;

[0067] Part of the clean gas is transported to the heating air supply device 105 through the third air supply duct 120 for heating, and then returned to the downwind column 101b through the second air supply duct 108 for reuse. Another part of the clean gas is transported to the pressurized air supply device 106 through the third air supply duct 120 for pressure boosting, and then returned to the upwind column 101a through the first air supply duct 107 for reuse.

[0068] Among them, the connecting line between the air supply column 101 and the adjacent air supply column 101 is L, and the angle ɑ between the connecting line L and the air outlet direction of the air supply column 101 is 20°; the air supply temperature of the downwind column 101b is 8°C higher than the air supply temperature of the upwind column 101a; the air supply speed of the upwind column 101a is 7m / s higher than the air supply speed of the downwind column 101b; the lowest air outlet point a of the upwind column 101a is 0.8m higher than the highest point A of the dust-generating surface 115; the lowest air outlet point b of the downwind column 101b is 1m higher than the lowest point B of the dust-generating surface 115; the monitoring device 112 is 3.5m higher than the highest point A of the dust-generating surface 115.

[0069] Example 3

[0070] The upwind column 101a and the downwind column 101b are used to supply air respectively to obtain an annular dust-laden airflow 109, and then the monitoring device 112 is used to collect the turbulence intensity and wind shear information of the dust-laden airflow. Then, the control device 113 sends an instruction to the driving device 111 according to the information collected by the monitoring device 112. The driving device 111 drives the negative pressure air collecting device 102 to slide along the sliding rod 114 and adjusts it to the optimal absorption position according to the instruction. Then, the negative pressure air collecting device 102 is used to collect the annular dust-laden airflow 109, and then the collected airflow is transported to the high-efficiency dust collector 103 in the dust removal unit for processing to obtain clean gas and dust, and the dust is transported to the ash storage box 104 for storage;

[0071] Part of the clean gas is transported to the heating air supply device 105 through the third air supply duct 120 for heating, and then returned to the downwind column 101b through the second air supply duct 108 for reuse. Another part of the clean gas is transported to the pressurized air supply device 106 through the third air supply duct 120 for pressure boosting, and then returned to the upwind column 101a through the first air supply duct 107 for reuse.

[0072] Among them, the connecting line between the air supply column 101 and the adjacent air supply column 101 is L, and the angle ɑ between the connecting line L and the air outlet direction of the air supply column 101 is 25°; the air supply temperature of the downwind column 101b is 15°C higher than the air supply temperature of the upwind column 101a; the air supply speed of the upwind column 101a is 5m / s higher than the air supply speed of the downwind column 101b; the lowest air outlet point a of the upwind column 101a is 0.5m higher than the highest point A of the dust-generating surface 115; the lowest air outlet point b of the downwind column 101b is 1.2m higher than the lowest point B of the dust-generating surface 115; the monitoring device 112 is 3.5m higher than the highest point A of the dust-generating surface 115.

[0073] Example 4

[0074] The method of Example 1 is followed, except that the angle ɑ between the connecting line L and the air outlet direction of the air supply column 101 is 45°.

[0075] Example 5

[0076] The method of Example 1 is followed, except that the air supply temperature of the downwind column 101b is 30°C higher than that of the upwind column 101a; and the air supply speed of the upwind column 101a is 15m / s higher than that of the downwind column 101b.

[0077] Example 6

[0078] The method of Example 1 is followed, except that the lowest air outlet point a of the upwind column 101a is 2.2m higher than the highest point A of the dust-generating surface 115 ; the lowest air outlet point b of the downwind column 101b is 1.8m higher than the lowest point B of the dust-generating surface 115 .

[0079] Comparative Example 1

[0080] The method of Example 1 is followed, except that the angle ɑ between the connecting line L and the air outlet direction of the air supply column 101 is 65°.

[0081] Comparative Example 2

[0082] The method of Example 1 is followed, except that the air supply temperature of the downwind column 101b is the same as the air supply temperature of the upwind column 101a.

[0083] Comparative Example 3

[0084] The method of Example 1 is implemented, except that the air supply temperature of the downwind column 101b is lower than the air supply temperature of the upwind column 101a.

[0085] Comparative Example 4

[0086] The method of Example 1 is followed, except that the air supply speed of the upwind column 101a is the same as the air supply speed of the downwind column 101b.

[0087] Comparative Example 5

[0088] The method of Example 1 is followed, except that the air supply speed of the upwind column 101a is lower than the air supply speed of the downwind column 101b.

[0089] Comparative Example 6

[0090] The method of Example 1 is followed, except that the height of the lowest air outlet point a of the upwind column 101a is equal to the height of the highest point A of the dust-raising surface 115; the height of the lowest air outlet point b of the downwind column 101b is equal to the height of the lowest point B of the dust-raising surface 115.

[0091] Test Case

[0092] The dust removal rates of the examples and comparative examples after treatment for the same time were tested, and the test results are shown in Table 1.

[0093] Table 1

[0094]

[0095]

[0096] It can be seen from the results in Table 1 that the method described in the present invention can achieve efficient dust removal for dust-laden gas in a closed space and has a high dust removal rate.

[0097] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for treating dust-laden gas, characterized in that: The method is implemented in a dust-laden gas processing system, which includes an air supply unit, a dust-laden gas collection unit, a dust removal unit, and a gas recycling unit; The air supply unit comprises at least three air supply columns (101) arranged around a dust-generating surface (115), wherein the air supply columns (101) are divided into an upper air column (101a) and a lower air column (101b); and the gas recycling unit comprises a heating air supply device (105) and a pressurized air supply device (106); The method comprises: using the upwind column (101a) and the downwind column (101b) to supply air respectively to obtain an annular dust-laden airflow (109); then using the dust-laden gas collection unit to collect the annular dust-laden airflow (109); and then transporting the annular dust-laden airflow (109) to the dust removal unit for processing to obtain clean gas; transporting part of the clean gas to the heating air supply device (105) for heating, and then returning the clean gas to the downwind column (101b) for reuse; and transporting another part of the clean gas to the pressurized air supply device (106) for pressure-increasing, and then returning the clean gas to the upwind column (101a) for reuse; Wherein, in the counterclockwise direction, the angle ɑ between the connecting line L between the air supply column (101) and the adjacent air supply column (101) and the air outlet direction of the air supply column (101) is less than 60°; The air supply temperature of the downwind column (101b) is higher than the air supply temperature of the upwind column (101a), and the air supply speed of the upwind column (101a) is higher than the air supply speed of the downwind column (101b); The lowest air outlet point a of the upper wind column (101a) is higher than the highest point A of the dust-generating surface (115), and the lowest air outlet point b of the lower wind column (101b) is higher than the lowest point B of the dust-generating surface (115).

2. The method according to claim 1, characterized in that The air supply temperature of the downwind column (101b) is 5-20°C higher than the air supply temperature of the upwind column (101a), and the air supply speed of the upwind column (101a) is 5-10m / s higher than the air supply speed of the downwind column (101b).

3. The method according to claim 1, characterized in that The lowest air outlet point a of the upwind column (101a) is 0.3-2 m higher than the highest point A of the dust-generating surface (115), and the lowest air outlet point b of the downwind column (101b) is 0.1-1.5 m higher than the lowest point B of the dust-generating surface (115).

4. The method according to claim 1, wherein In the counterclockwise direction, the angle ɑ between the connecting line L between the air supply column (101) and the adjacent air supply column (101) and the air outlet direction of the air supply column (101) is less than 45°, preferably 20-35°.

5. The method according to claim 1, wherein The dust-laden gas collection unit is provided with a monitoring device (112), a control device (113), a driving device (111), a negative pressure gas collecting device (102) and a sliding rod (114); the negative pressure gas collecting device (102) is connected to the sliding rod (114) via the driving device (111); The method further comprises: using a monitoring device (112) to collect information on the dust-laden airflow; then the control device (113) controls the driving device (111) according to the information collected by the monitoring device (112); and adjusting the position of the negative pressure air collecting device (102) through the driving device (111).

6. The method according to claim 5, characterized in that The monitoring device (112) is used to collect turbulence intensity and wind shear parameters of the annular dust-laden airflow (109).

7. The method according to claim 5 or 6, characterized in that The installation height of the monitoring device (112) is 3-4 m higher than the highest point A of the dust-generating surface (115).

8. The method according to any one of claims 1 to 7, characterized in that The negative pressure gas collecting device (102) is connected to the dust removal unit via a telescopic pipe (110).

9. The method according to claim 1 or 8, characterized in that The dust removal unit includes a high-efficiency dust collector (103) and a dust storage box (104); The high-efficiency dust collector (103) is used to perform dust removal processing on the annular dust-laden airflow (109) to obtain clean gas and dust, and the dust is transported to the dust storage box (104) for storage.

10. The method according to any one of claims 1 to 9, characterized in that A flow guide device is provided at the air outlet of the air supply column (101) for adjusting the angle ɑ.

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