Cyclone reinforced bag-type dust collector

Abstract

The utility model relates to the technical field of blast furnace gas process adjustment, and discloses a cyclone reinforced bag-type dust collector, which comprises a barrel and a dust collection device in the barrel, the dust collection device in the barrel comprises a venturi cone section, a flow guide grating and a filter device, and the venturi cone section, the flow guide grating and the filter device are sequentially arranged from bottom to top. The venturi cone section comprises an upper section, a throat section and a lower section, flow channel openings of the upper section and the lower section expand outwards from the throat section, the flow channel opening in the top end of the upper section is larger than the flow channel opening in the bottom of the lower section, and an air inlet is formed in the side face of a cylinder straight section in the middle of the cylinder. The device integrates four functions of cyclone coarse dust removal, venturi cone section flow field acceleration and uniform distribution, grating plate flow guide, filter bag fine dust removal and the like, the integrated design is realized, and the dust removal efficiency is greatly improved. The device is provided with a big-end-up Venturi cone section, so that a flow field at an outlet in the top of the Venturi cone section is uniformly distributed.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace gas process regulation, in particular to a cyclone-enhanced bag dust collector. Background Art

[0002] In recent years, as people pay close attention to increasingly severe environmental and climate issues, it is imperative to build low-carbon, clean and efficient enterprises. During the blast furnace smelting process, a large amount of high-temperature dusty gas is generated. The dusty gas has a low combustion calorific value and generally requires dust removal to obtain clean gas. Traditional blast furnace gas dust removal uses a combination of gravity dust removal and dry bag dust collector. The dust concentration at the inlet of the dry bag dust collector is 20-30g / Nm3, and the airflow field is unevenly distributed, which causes serious impact and wear on the bag, resulting in a short service life of the filter bag, generally 18 months.

[0003] The patent application with publication number CN217613556U discloses a blast furnace dry bag dust collector ash unloading and pressure relief device, which relates to the field of steel manufacturing, including a box body, a first connecting pipe is fixedly connected to one side of the top of the box body, a raw gas pipe is fixedly installed on one side of the bottom of the box body, a second connecting pipe is fixedly arranged at the bottom end of the box body, and a scraper is also fixedly connected to the end of the second connecting pipe away from the box body. When the bag dust collector system performs ash unloading operation, the pressurized coal gas enters the top of the ash bin from the tail of the scraper through the third connecting pipe, and then enters the box body of the dust collector through a bell valve, and finally is discharged into the air after being filtered by the bag.

[0004] The prior art uses a combination of gravity dust removal and dry bag dust collector. The airflow field is unevenly distributed, and the impact and wear on the bags are relatively serious, resulting in a short service life of the filter bags and low dust removal efficiency.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a cyclone-enhanced bag dust collector, which integrates four functions, namely, cyclone coarse dust removal, Venturi cone flow field acceleration and uniform distribution, grid plate diversion, and filter bag fine dust removal, realizes an integrated design, and greatly improves the dust removal efficiency.

[0007] The technical solution adopted by the utility model is:

[0008] A cyclone-enhanced bag dust collector comprises a cylinder and a dust removal device in the cylinder, wherein the dust removal device in the cylinder comprises a Venturi cone section, a guide grid, and a filter device, which are arranged in sequence from bottom to top, and the Venturi cone section comprises an upper section, a throat section, and a lower section, wherein the flow channel openings of the upper section and the lower section are both expanded outward from the throat section, the flow channel opening at the top of the upper section is larger than the flow channel opening at the bottom of the lower section, and an air inlet is arranged on the side of the straight section of the cylinder in the middle of the cylinder.

[0009] By adopting the above structure, the device integrates four functions including cyclone coarse dust removal, Venturi cone flow field acceleration and uniform distribution, grid plate diversion, and filter bag fine dust removal, realizing an integrated design and greatly improving the dust removal efficiency.

[0010] Preferably, the air inlet is located at the place where the Venturi cone section is installed in the straight section of the cylinder, the air inlet is eccentrically tangent to the straight section of the cylinder, and the air inlet is located above the throat section of the Venturi cone section.

[0011] By adopting the above structure, dusty coal gas flows in from the air inlet and hits the straight section of the cylinder. The airflow moves downward in a spiral, turns 180 degrees at the bottom and then moves upward. The dust particles are deposited to the bottom of the ash hopper under the action of inertia and their own gravity.

[0012] Preferably, the guide grid is arranged on the top flow channel opening of the upper and middle section of the Venturi cone section, and the guide grid is spliced ​​into a lattice plate shape by steel plates.

[0013] By adopting the above structure, the flow guide grid has small resistance, which can further even out the flow of dusty gas and can also be used as a maintenance platform inside the cylinder.

[0014] Preferably, the filtering device includes a filter bag and a bag cage. The filter bag is made of ultra-fine glass fiber composite filter material and is temperature resistant to 250°C. The bag cage is made of cold-drawn steel wire and has a venturi tube on the top.

[0015] By adopting the above structure, the dust-containing gas is further dust-removed by the filter bag, and the dust content of the clean gas discharged from the top is less than 3mg / Nm3.

[0016] Preferably, the top of the filter device is mounted on a grating plate, and a spraying system of the filter device is mounted on the grating plate.

[0017] Preferably, a top head is provided at the top of the straight section of the cylinder, and an air outlet is formed on the top head. The bottom of the straight section of the cylinder is connected to an external ash hopper, and the bottom end of the external ash hopper is an ash discharge port.

[0018] Preferably, a maintenance manhole is provided on the side of the straight section of the cylinder.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The utility model device integrates four functions, namely, cyclone coarse dust removal, Venturi cone flow field acceleration and uniform distribution, grid plate flow guidance, and filter bag fine dust removal, realizing an integrated design and greatly improving the dust removal efficiency.

[0021] 2. The utility model device is provided with a Venturi cone section which is larger at the top and smaller at the bottom. The coal gas which has undergone preliminary dust removal enters from the bottom of the Venturi cone section, and the flow channel area is gradually reduced, the airflow is compressed and accelerated. After the airflow passes through the narrowest throat section, the flow channel area is gradually enlarged, the airflow is steadily slowed down, and the flow field at the top outlet of the Venturi cone section is evenly distributed.

[0022] 3. The air inlet of the utility model device is eccentrically tangent to the straight section of the cylinder. After the dust-laden gas flows in, it hits the inside of the straight section of the cylinder. The airflow moves downward in a spiral, turns 180 degrees at the bottom and then moves upward. The dust particles are deposited downward to the bottom of the ash hopper under the action of inertia and their own gravity. This cyclone rough dust removal initially removes 50% of the dust, reducing the operating load of subsequent fine dust removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a top view of the structure of the utility model;

[0025] Figure 3 It is a structural schematic diagram of the guide grille of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the Venturi cone section of the utility model.

[0027] Among them: 1. Air outlet; 2. Top head; 3. Injection system; 4. Filter device; 5. Venturi cone section; 6. Air inlet; 7. External ash hopper; 8. Ash discharge port; 9. Inspection manhole; 10. Straight section of the cylinder; 11. Guide grille; 12. Grating plate; 13. Cylinder; 14. Upper section; 15. Throat section; 16. Lower section. DETAILED DESCRIPTION

[0028] like Figure 1-4As shown, the cyclone-enhanced bag dust collector comprises a cylinder 13 and a dust removal device in the cylinder 13. The dust removal device in the cylinder 13 comprises a Venturi cone section 5, a guide grid 11, and a filter device 4. The Venturi cone section 5, the guide grid 11, and the filter device 4 are arranged in sequence from bottom to top. The Venturi cone section 5 comprises an upper section 14, a throat section 15, and a lower section 16. The flow passage openings of the upper section 14 and the lower section 16 are both expanded outward from the throat section 15. The flow passage opening at the top of the upper section 14 is larger than the flow passage opening at the bottom of the lower section 16. The coal gas that has undergone preliminary dust removal treatment enters from the bottom of the Venturi cone section 5, and the flow passage area gradually decreases, and the airflow is compressed and accelerated. After the airflow passes through the narrowest throat section 15, the flow passage area is gradually enlarged, and the airflow is steadily slowed down, so that the flow field at the top outlet of the Venturi cone section 5 is evenly distributed. An air inlet 6 is arranged on the side of the cylinder straight section 10 in the middle of the cylinder 13. The top of the cylinder straight section 10 is provided with a top head 2, on which is an air outlet 1. The bottom of the cylinder straight section 10 is connected to an external ash hopper 7, and the bottom of the external ash hopper 7 is an ash discharge port 8. A maintenance manhole 9 is provided on the side of the cylinder straight section 10. The device integrates four functions, namely, cyclone coarse dust removal, Venturi cone flow field acceleration and uniform distribution, grid plate diversion, and filter bag fine dust removal, realizing an integrated design, greatly improving the dust removal efficiency, the equipment occupies a small space, is easy to install and maintain, and saves initial investment.

[0029] The air inlet 6 is located at the place where the Venturi cone section 5 is installed in the straight section 10 of the cylinder. The air inlet 6 is eccentrically tangent to the straight section 10 of the cylinder. The air inlet 6 is located above the throat section 15 of the Venturi cone section 5. The air inlet 6 is eccentrically tangent to the straight section 10 of the cylinder. After the dust-laden coal gas flows in, it hits the inside of the straight section of the cylinder. The airflow moves downward in a spiral, turns 180 degrees at the bottom and then moves upward. The dust particles are deposited downward to the bottom of the ash hopper under the action of inertia and their own gravity. This cyclone rough dust removal initially removes 50% of the dust, reducing the operating load of the subsequent fine dust removal.

[0030] The guide grid 11 is arranged on the top flow channel opening of the middle and upper section 14 of the Venturi cone section 5. The guide grid 11 is made of steel plates spliced ​​into a lattice plate shape. The guide grid 11 further guides and evenly distributes the dusty coal gas, making the airflow flow more evenly and smoothly.

[0031] The filter device 4 includes a filter bag and a bag cage. The filter bag is made of ultra-fine glass fiber composite filter material, which is temperature-resistant to 250°C. The bag cage is made of cold-drawn steel wire and has a venturi tube on the top. The top of the filter device 4 is installed on the grating plate 12, and the injection system 3 of the filter device 4 is installed on the grating plate 12. The dust-containing gas flows upward, and after fine dust removal treatment by the filter bag, the dust content of the clean gas discharged from the top is less than 3mg / Nm3, and the clean gas finally flows out of the equipment from the gas outlet 1. After the device has been used for a period of time, dust will be attached to the outer surface of the filter bag, and the dust layer will gradually thicken. When the pressure difference between the inside and outside of the filter bag reaches 1500Pa, the injection system 3 can be remotely started for dust removal.

[0032] This device uses a two-step dust removal process of cyclone coarse dust removal and filter bag fine dust removal, which greatly improves the dust removal efficiency. The dust removal efficiency is as high as 99.99%, and the dust content in the clean coal gas is less than 3mg / Nm3. Because of the existence of cyclone coarse dust removal, the equipment can first capture large particles of dust and evenly distribute the dust-containing airflow, which reduces the impact and wear of the airflow on the filter bag, greatly prolongs the service life of the filter bag, reduces operating costs, and the treated clean coal gas improves the combustion quality, increasing economic benefits for the enterprise.

[0033] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should be included in the protection scope determined by the claims of the present invention.

Claims

1. A cyclone-enhanced bag dust collector, comprising a cylinder and a dust removal device in the cylinder, characterized in that: The dust removal device in the cylinder includes a Venturi cone section, a guide grid, and a filter device, which are arranged in sequence from bottom to top. The Venturi cone section includes an upper section, a throat section, and a lower section. The flow channel openings of the upper section and the lower section are both expanded outward from the throat section. The flow channel opening at the top of the upper section is larger than the flow channel opening at the bottom of the lower section. An air inlet is arranged on the side of the straight section of the cylinder in the middle of the cylinder.

2. The cyclone-enhanced bag dust collector according to claim 1 is characterized in that: The air inlet is located at the place where the Venturi cone section is installed in the straight section of the cylinder, the air inlet is eccentrically tangent to the straight section of the cylinder, and the air inlet is located above the throat section of the Venturi cone section.

3. The cyclone-enhanced bag dust collector according to claim 1 is characterized in that: The guide grid is arranged on the top flow channel opening of the middle and upper section of the Venturi cone section, and the guide grid is spliced ​​into a lattice plate shape by steel plates.

4. The cyclone-enhanced bag dust collector according to claim 1 is characterized in that: The filtering device comprises a filter bag and a bag cage. The filter bag is made of ultra-fine glass fiber composite filter material and is temperature-resistant to 250°C. The bag cage is made of cold-drawn steel wire and is provided with a venturi tube on the top.

5. The cyclone-enhanced bag dust collector according to claim 1 is characterized in that: The top of the filter device is installed on a lattice plate, and a spraying system of the filter device is installed on the lattice plate.

6. The cyclone-enhanced bag dust collector according to claim 1, characterized in that: The top of the straight section of the cylinder is provided with a top head, on which an air outlet is provided, and the bottom of the straight section of the cylinder is connected to an external ash hopper, and the bottom end of the external ash hopper is an ash discharge port.

7. The cyclone-enhanced bag dust collector according to claim 1 is characterized in that: A maintenance manhole is arranged on the side of the straight section of the cylinder.

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