Pre-dedusting device for flue gas circulating system of sintering machine

Abstract

The utility model provides a pre-dedusting device for a flue gas circulating system of a sintering machine, which is arranged between the sintering machine and a multi-tube dust remover and comprises a gravity dedusting pipeline, a gas inlet pipeline, a gas outlet pipeline, a gas inlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas inlet pipeline and a gas outlet pipeline, the diameter of the constant-diameter section is twice that of the smoke outlet pipeline; the flow guide plates are vertically arranged on the top wall in the constant-diameter section, and the multiple flow guide plates are arranged on the constant-diameter section in parallel in the length direction of the gravity dust removal pipeline; the bottom baffles are arranged on the bottom face in the constant-diameter section, the multiple bottom baffles are arranged on the constant-diameter section in parallel in the length direction of the gravitational dust removal pipeline, and the bottom baffles and the flow guide plates are distributed at intervals one by one; and the plurality of dust collection funnels are arranged below the gravity dust removal pipeline. According to the pre-dedusting device for the flue gas circulation system of the sintering machine, provided by the utility model, not only are the abrasion and impact of large-particle dust on the pipeline avoided, but also the workload of a multi-tube dust remover is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of sintering flue gas circulation, and in particular relates to a pre-dust removal device for a sintering machine flue gas circulation system. Background Technology

[0002] Sintering flue gas recirculation technology extracts flue gas from the main flue of the sintering machine, passes it through a dust collector and a circulating fan, and then returns it to the surface of the sintering machine material layer for sintering. This reduces the amount of flue gas in the sintering machine, improves the utilization rate of waste heat from the sintering hot flue gas, reduces the fuel ratio, and achieves energy saving and emission reduction. According to professional data, after adopting this technology, the flue gas emissions from the sintering machine can be reduced by about 30%, the utilization rate of waste heat from the sintering hot flue gas can be increased to over 80%, and the fuel ratio can be reduced by about 15%. Flue gas recirculation involves extracting flue gas from several different dust collectors. The mixed flue gas needs to be purged by a multi-tube dust collector before returning to the sintering machine material surface for sintering via the flue gas recirculation system. The mixed flue gas contains a large amount of dust, with particles of varying sizes and high hardness. Directly entering the multi-tube dust collector may reduce its efficiency or even cause blockage and wear.

[0003] Traditional sintering fume recirculation dust removal technology mainly relies on multi-tube dust collectors. While cyclone dust collectors can remove dust from the flue gas to some extent, their dust removal efficiency and stability are difficult to guarantee when facing increasingly stringent environmental standards and the challenges of varying dust particle sizes in sintering fume. According to relevant statistics, the dust removal efficiency of traditional sintering fume recirculation dust removal technology is only about 60%, and the efficiency gradually decreases with the increase of flue gas recirculation. In particular, dust accumulates continuously during the flue gas recirculation process, which increases the burden on multi-tube dust collectors, gradually reduces dust removal efficiency, and may even lead to blockage and wear, thus seriously affecting the stability of sintering fume recirculation.

[0004] To reduce the workload of multi-tube dust collectors and extend their service life, a pre-dust removal step is added before the flue gas enters the multi-tube dust collector. Pre-dust removal first recovers some large dust particles, while smaller dust particles undergo secondary dust removal through the multi-tube dust collector. This method can significantly reduce the workload of the multi-tube dust collector, improve dust removal efficiency, extend its service life, and reduce operating costs. However, conventional pre-dust removal uses gravity dust collection, the effectiveness of which is closely related to the duct air velocity. Because gravity dust collection relies on the dust's own weight to eventually settle into the funnel, when the air velocity is too high, the settling time is very short, and the dust is carried away by the wind before it can settle into the funnel. To increase the settling time, the size of the funnel must be adjusted to match the air velocity. However, this increases costs and requires a larger plant area. This not only increases the equipment's footprint but may also impose certain restrictions on the layout of the production site and logistics. Similarly, the larger gravity dust collector also increases the cleaning burden. To maintain its dust removal effect, it needs to be cleaned and maintained regularly. This not only increases maintenance costs but may also affect the normal operation of the production line. If gravity dust collectors are cleaned using water flushing, a large amount of wastewater and pollutants will be generated. If not handled properly, this wastewater and pollutants may directly threaten air and water quality safety, thereby causing environmental problems. Utility Model Content

[0005] One object of this invention is to provide a pre-dust removal device for a sintering machine flue gas recirculation system, and to provide at least the advantages described below.

[0006] Another objective of this invention is to provide a pre-dust removal device for the flue gas circulation system of a sintering machine, which not only avoids the wear and impact of large dust particles on the pipeline, but also reduces the workload of the multi-tube dust collector.

[0007] The technical solution of this utility model is as follows:

[0008] A pre-dust removal device for the flue gas recirculation system of a sintering machine, installed between the sintering machine and a multi-tube dust collector, includes:

[0009] The gravity dust collection duct includes an enlarged diameter section connected to the flue gas outlet duct of the sintering machine, and a constant diameter section connected to the flue gas inlet of the multi-tube dust collector, wherein the diameter of the constant diameter section is twice the diameter of the flue gas outlet duct.

[0010] A guide plate is vertically installed on the top wall of the constant diameter section, and multiple guide plates are arranged parallel to each other along the length of the gravity dust removal pipe in the constant diameter section.

[0011] Bottom baffles are provided on the bottom surface within the constant diameter section, and multiple bottom baffles are arranged parallel to each other along the length of the gravity dust removal pipe in the constant diameter section, with the bottom baffles and the guide plates distributed at intervals.

[0012] And multiple dust collection funnels, which are located below the gravity dust removal pipe.

[0013] Preferably, in the pre-dust removal device for the sintering machine flue gas recirculation system,

[0014] The edge portion of the guide plate is irregularly serrated;

[0015] The lengths of the guide vanes are all different.

[0016] Preferably, in the pre-dust removal device for the sintering machine flue gas recirculation system,

[0017] The edge portion of the bottom baffle is irregularly serrated;

[0018] The lengths of the bottom baffles are all different.

[0019] Preferably, in the pre-dust removal device for the sintering machine flue gas recirculation system,

[0020] The guide plate and the bottom baffle are staggered;

[0021] The top walls of the multiple guide vanes within the constant diameter section are arranged in an S-shape;

[0022] The top walls of the multiple bottom baffles within the constant diameter section are distributed in an S-shape.

[0023] Preferably, in the pre-dust removal device for the sintering machine flue gas circulation system, the bottom baffle is set at an inclined angle to the wall of the constant diameter section, and the inclined angle is 60°. o -80 o The tilt direction is towards the direction of the incoming smoke from the gravity dust removal duct.

[0024] This utility model has the following beneficial effects:

[0025] By locally increasing the pipe diameter, the wind speed was successfully reduced to 5 m / s. This reduction in wind speed extended the gravity dust removal time within the device.

[0026] In these locally enlarged pipes, baffles and bottom baffles are specially installed. Utilizing the inertia of dust particles, they impact the pipe walls and baffles, thus achieving sedimentation. The baffles not only effectively guide the flow of flue gas but also further refine dust particles during the impact process, enhancing the gravity settling effect. The special shape, angle design, and distribution of the baffles ensure uniform distribution of flue gas within the pipes, preventing localized dust accumulation.

[0027] By installing funnels side by side, the dust recovery efficiency can be greatly improved.

[0028] In sintering fume recirculation systems, the dust content of the flue gas before dust removal is typically 5 g / m³. After treatment by this pre-dust removal device, the dust content of the recirculating flue gas can be reduced to 1 g / m³. In this way, large dust particles are filtered out using this device, and combined with the cyclone dust collection of a multi-tube dust collector, fine dust particles can be recovered. The dust content of the recirculating flue gas after dust removal can reach 40 mg / m³, which not only avoids wear and impact on the pipelines caused by large dust particles but also reduces the workload of the multi-tube dust collector.

[0029] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0030] Figure 1 A schematic diagram of a structure of an embodiment of the pre-dust removal device for a sintering machine flue gas circulation system provided by this utility model;

[0031] Figure 2 This is a schematic diagram showing the distribution of guide plates in one embodiment of the pre-dust removal device for the flue gas circulation system of a sintering machine provided by this utility model. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0033] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not imply the presence or addition of one or more other elements or combinations thereof.

[0034] like Figure 1 and Figure 2 As shown, this utility model provides a pre-dust removal device for a sintering machine flue gas recirculation system, installed between the sintering machine and a multi-tube dust collector, comprising:

[0035] The gravity dust removal duct includes an enlarged diameter section 2 connected to the flue gas duct 1 of the sintering machine, and a constant diameter section 3 connected to the flue gas inlet of the multi-tube dust collector, wherein the diameter of the constant diameter section 3 is twice the diameter of the flue gas duct 1.

[0036] A guide plate 4 is vertically installed on the top wall of the constant diameter section 3, and multiple guide plates 4 are arranged parallel to each other along the length of the gravity dust removal pipe in the constant diameter section 3.

[0037] Bottom baffle 5 is disposed on the bottom surface within the constant diameter section 3, and multiple bottom baffles 5 are arranged parallel to each other along the length of the gravity dust removal pipe in the constant diameter section 3, with the bottom baffles 5 and the guide plate 4 distributed at intervals.

[0038] And multiple dust collection funnels 6, which are located below the gravity dust removal pipe.

[0039] The edge portion of the guide plate 4 is irregularly serrated;

[0040] The lengths of the guide plates 4 are all different.

[0041] The edge portion of the bottom baffle 5 is irregularly serrated;

[0042] The lengths of the bottom baffles 5 are all different.

[0043] The guide plate 4 and the bottom baffle 5 are staggered;

[0044] The multiple guide plates 4 are arranged in an S-shape on the top wall of the constant diameter section 3;

[0045] The multiple bottom baffles 5 are arranged in an S-shape on the top wall within the constant diameter section 3.

[0046] The bottom baffle 5 is set at an inclined angle to the pipe wall of the constant diameter section 4, and the inclined angle is 60°. o -80 o The tilt direction is towards the direction of the incoming smoke from the gravity dust removal duct.

[0047] This utility model has the following features:

[0048] 1. Increase the pipe diameter locally:

[0049] The dust collection efficiency of gravity dust collectors is closely related to the flue gas velocity, as the flue gas diameter directly affects the flue gas flow rate. Specifically, when the flue gas diameter is larger, the flue gas velocity within it is relatively lower, giving dust particles more time and opportunity to settle. Therefore, by locally adjusting and changing the flue gas diameter in a specific area of ​​the device, we can effectively control the flue gas velocity, thereby improving dust collection efficiency. In practical applications, doubling the diameter of the flue gas in the gravity dust collection area typically results in a significant improvement in dust collection efficiency, with a minimum improvement of 1.5 times.

[0050] II. Design of the air deflector:

[0051] Baffles are highly effective flue gas treatment devices. They not only change the flow direction of flue gas but also effectively control its velocity. By installing baffles and deflectors, the flow path of the flue gas in the gravity dust collection zone can be flexibly switched. This directional switching gives dust particles more opportunities to collide with the pipe walls and deflectors, thus increasing the likelihood of dust settling. In this way, the distance the flue gas travels within the gravity dust collection zone is extended, and the settling time is correspondingly increased, which directly improves dust collection efficiency. For example, deflectors can be installed at the bottom of the baffles, or the number of baffles can be increased; these measures can alter the flue gas velocity, helping to achieve uniformity in the recovery of flue gas particles.

[0052] This device significantly improves recycling efficiency and effectively reduces costs while maintaining the same dimensions as conventional gravity dust collectors. Simultaneously, it extends the service life of multi-tube dust collectors due to its simple structure and ease of maintenance and operation. This device not only offers high economic benefits but also possesses significant potential for widespread adoption due to its high efficiency and ease of use.

[0053] This utility model relates to the technical field of flue gas treatment technology, specifically a pre-dust removal device designed for a sintering machine flue gas recirculation system. This device is installed before the dust removal system to improve the overall efficiency of the sintering machine flue gas dust removal system. In this way, the workload of subsequent flue gas treatment equipment can be effectively reduced, thereby decreasing wear and tear and the failure rate of these devices. Furthermore, the use of this pre-dust removal device can extend the service life of the entire flue gas treatment equipment, ensuring more stable and prolonged operation.

[0054] This device aims to improve the dust removal efficiency of the sintering machine flue gas circulation system, reduce the burden on multi-tube dust collectors, extend their service life, and reduce wear and tear on pipelines caused by large dust particles, thereby lowering costs. In the sintering machine flue gas circulation system, the pipe diameter in the device area is increased, and guide plates, baffles, and funnels are installed within the area. Circulating air enters the dust collector after passing through the guide plates and baffles. Increasing the pipe diameter reduces the air velocity, increasing the gravity settling time of dust particles. The dust particles also impact the baffles due to inertia, further increasing the settling time and thus improving dust removal efficiency. The air then undergoes secondary cyclone dust removal in the multi-tube dust collector before being sent to the sealed hood for recirculation. This pre-dust removal device, through optimized design, combines multiple dust removal mechanisms such as gravity settling and inertial separation, achieving effective removal of larger particles from the sintering machine flue gas.

[0055] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A pre-dust removal device for a sintering machine flue gas recirculation system, installed between the sintering machine and a multi-tube dust collector, characterized in that, include: The gravity dust collection duct includes an enlarged diameter section connected to the flue gas outlet duct of the sintering machine, and a constant diameter section connected to the flue gas inlet of the multi-tube dust collector, wherein the diameter of the constant diameter section is twice the diameter of the flue gas outlet duct. A guide plate is vertically installed on the top wall of the constant diameter section, and multiple guide plates are arranged parallel to each other along the length of the gravity dust removal pipe in the constant diameter section. Bottom baffles are provided on the bottom surface within the constant diameter section, and multiple bottom baffles are arranged parallel to each other along the length of the gravity dust removal pipe in the constant diameter section, with the bottom baffles and the guide plates distributed at intervals. And multiple dust collection funnels, which are located below the gravity dust removal pipe.

2. The pre-dust removal device for a sintering machine flue gas recirculation system as described in claim 1, characterized in that, The edge portion of the guide plate is irregularly serrated; The lengths of the guide vanes are all different.

3. The pre-dust removal device for the flue gas recirculation system of a sintering machine as described in claim 2, characterized in that, The edge portion of the bottom baffle is irregularly serrated; The lengths of the bottom baffles are all different.

4. The pre-dust removal device for a sintering machine flue gas recirculation system as described in claim 3, characterized in that, The guide plate and the bottom baffle are staggered; The top walls of the multiple guide vanes within the constant diameter section are arranged in an S-shape; The top walls of the multiple bottom baffles are distributed in an S-shape within the constant diameter section.

5. The pre-dust removal device for a sintering machine flue gas recirculation system as described in claim 3, characterized in that, The bottom baffle is arranged at an inclined angle with the pipe wall of the constant diameter section, and the inclined angle is 60 o -80 o , and the inclined direction is toward the smoke incoming direction of the gravity dedusting pipeline.

Images