Tail gas recycling device and process in calcium carbonate processing

Abstract

The application relates to the technical field of gas purification, in particular to a tail gas recycling device and process in calcium carbonate processing. The tail gas recycling device in calcium carbonate processing comprises a dust removal rack and cloth bags. An air inlet is arranged on the lower side of the dust removal rack and is communicated with a tail gas pipeline. An air outlet is arranged on the upper side of the dust removal rack and is connected with an external air pump. Two left-right symmetrical top plates are rotationally connected on the upper side of the dust removal rack. A partition plate is arranged in the dust removal rack. The dust removal rack is divided into an upper chamber and a lower chamber by the partition plate. A plurality of cloth bags distributed in a rectangular shape are arranged on the partition plate. The compressed air flow can be uniformly blown to the circumferential surface of the cloth bag by controlling the downward movement of the supporting ring, so that the cleaning effect of the compressed air flow on the cloth bag is improved. The cloth bag is expanded by the air bag, the aperture is increased, the compressed air flow can blow out the dust in the aperture, and the cleaning effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of gas purification technology, and in particular to a device and process for recycling tail gas in calcium carbonate processing. Background Technology

[0002] The calcination process of calcium carbonate typically generates a large amount of exhaust gas, primarily composed of carbon dioxide and containing a significant amount of dust particles. However, the subsequent carbonation reaction of calcium carbonate requires carbon dioxide, necessitating its recovery. This recovery typically involves using a baghouse dust collector to separate dust and impurities. Existing baghouse dust collectors usually employ a cylindrical metal support frame to support the filter bags, allowing the exhaust gas to flow from the outside to the inside of the bags, trapping dust on the outer side. When a significant amount of dust accumulates on the outer side, high-pressure gas is ejected from a jet pipe above the bags, causing the airflow to move from the inside to the outside, thus blowing away the dust and impurities. However, the areas of the bags furthest from the jet pipe are less affected by the high-pressure airflow, resulting in reduced dust removal efficiency and impacting the subsequent filtration performance.

[0003] In summary, this application proposes a device and process for recycling tail gas in calcium carbonate processing, thereby improving the aforementioned technical problems. Summary of the Invention

[0004] In order to overcome the shortcomings of existing baghouse dust collectors, such as the inability of the high-pressure airflow from the jet pipe to evenly cover the entire bag during the dust removal process, resulting in poor dust removal effect in areas far from the jet pipe and dust residue affecting subsequent filtration efficiency, this invention provides a tail gas recycling device and process in calcium carbonate processing.

[0005] The technical solution is as follows: A device for recycling tail gas in calcium carbonate processing includes a dust collector frame and filter bags; an air inlet is provided on the lower side of the dust collector frame, which is connected to the tail gas pipeline; an air outlet is provided on the upper side of the dust collector frame, which is connected to an external air pump; two symmetrical top plates are rotatably connected to the upper side of the dust collector frame; a partition is provided inside the dust collector frame; the partition divides the dust collector frame into an upper chamber and a lower chamber; several filter bags arranged in a rectangular pattern are installed on the partition; the filter bags are cylindrical in shape; the upper opening of the filter bags is connected to the upper chamber; it also includes a first driving component, a first connecting plate, a support rod, a support ring, and a first air supply pipe; the dust collector frame is equipped with... There are several first driving components; all the telescopic ends of the first driving components are connected to a first connecting plate; several support rods are fixedly connected to the first connecting plate; each support rod is located inside an adjacent bag; several support rings are fixedly connected to each support rod; the support rings are in contact with the inner wall of the adjacent bag; each support ring has a cavity inside; several air blowing holes for cleaning dust adhering to the inner wall of the bag are opened on the circumferential surface of each support ring, and are connected to the cavity of the adjacent support ring; a first air supply pipe is fixedly connected to each support rod; the first air supply pipe is connected to the cavity of the adjacent support ring; all the first air supply pipes are connected to an external air supply device.

[0006] Optionally, the support rod is made of aluminum alloy tubing with good bending resistance.

[0007] Optionally, it also includes airbags and second air supply pipes; two airbags for expanding the bag are fixedly connected to each support ring; the two airbags are located above and below adjacent air inlets, respectively; a second air supply pipe is fixedly connected to each support rod; each second air supply pipe is connected to an adjacent airbag; all second air supply pipes are connected to an external air supply device.

[0008] Optionally, it also includes a flow equalization plate; several flow equalization plates are fixedly connected to the lower side of the baffle to slow down and disperse the exhaust gas flow; the flow equalization plate is cylindrical; several air vents are provided on the flow equalization plate in a ring arrangement; each flow equalization plate covers the outside of the adjacent filter bag.

[0009] Optionally, it also includes a second driving component, a fixed frame, and a shielding ring; several second driving components are fixedly connected inside the dust collector frame; all the telescopic ends of the second driving components are fixedly connected to the fixed frame; several shielding rings are fixedly connected to the fixed frame; each shielding ring is in contact with the inner side of the adjacent flow equalization plate; each shielding ring has ventilation holes that are distributed in the same way as the flow equalization plate.

[0010] Optionally, it also includes a support assembly; the support assembly includes a second connecting plate, a sliding rod, and an electromagnet; each support rod is a hollow structure; the second connecting plate is slidably connected to the first connecting plate; several fixed rods are provided on the second connecting plate; several sliding rods are installed on each fixed rod; each sliding rod is located inside an adjacent support rod; a support block for supporting the bottom of the filter bag is provided at the bottom of each sliding rod; a fixed block is provided at the bottom of each filter bag; adjacent fixed blocks and support blocks are vertically aligned; several electromagnets are installed inside the dust collector frame; each electromagnet is in contact with the bottom surface of an adjacent second connecting plate; the contact area between each second connecting plate and the electromagnet is made of magnetic material.

[0011] Optionally, each sliding rod is provided with a handle on its upper side; each fixed rod is provided with several limiting rods, and the limiting rods are respectively located on the front and rear sides of the adjacent handles; each sliding rod has two protrusions on its bottom support block for cooperating with and connecting the fixed block; each fixed block has two limiting grooves with shapes corresponding to the adjacent protrusions.

[0012] Optionally, both the support block and the fixing block are made of magnetic material.

[0013] Optionally, an inspection door is provided on the dust collector frame.

[0014] A process for recycling tail gas during calcium carbonate processing includes the following steps:

[0015] S1: Cooling. The carbon dioxide-containing exhaust gas from the calcination of calcium carbonate is transported through a pipeline to a cooler for cooling, and then the cooled exhaust gas is transported to a dust collector.

[0016] S2: Filtration, which uses a dust collector to intercept dust particles in the exhaust gas and regularly cleans and collects the intercepted dust particles;

[0017] S3: Recovery. The filtered exhaust gas is stored in a special container. In the subsequent carbonation reaction process, the exhaust gas containing carbon dioxide is passed into lime water to generate calcium carbonate precipitate.

[0018] The beneficial effects of this invention are:

[0019] Compared with conventional bag dust collectors, by controlling the downward movement of the support ring, the compressed airflow can be evenly blown onto the circumferential surface of the bag, thereby improving the cleaning effect of the compressed airflow on the bag. Furthermore, by expanding the bag with airbags, the pores are enlarged, which facilitates the compressed airflow to blow out the dust in the pores, further improving the cleaning effect.

[0020] The bottom of the filter bag is supported by a sliding rod to prevent the support ring from moving the filter bag upwards, thus keeping the circumferential surface of the filter bag flat and ensuring the filtration quality of the filter bag.

[0021] By sliding the bag into the support rod, the outer side of the bag is folded to the inner side, and the opening of the bag is sealed. Therefore, the dust on the bag will not escape, reducing the difficulty of cleaning and preventing workers from inhaling dust. Attached Figure Description

[0022] Figure 1 This is a first-view perspective three-dimensional structural diagram of the tail gas recycling device in calcium carbonate processing according to the present invention.

[0023] Figure 2 This is a two-dimensional structural diagram of the tail gas recycling device in the calcium carbonate processing of the present invention from a second perspective.

[0024] Figure 3 This is a three-dimensional structural diagram of the dust collector frame, filter bag, support rod, and support ring assembly of the present invention.

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the dust collector frame and filter bag assembly of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the first connecting plate, support rod, and support ring assembly of the present invention;

[0027] Figure 6 for Figure 5 Enlarged view of area A in the middle;

[0028] Figure 7 This is a three-dimensional structural diagram of the combination of the cloth bag, support ring, flow equalization plate and shielding ring of the present invention;

[0029] Figure 8 for Figure 7 Enlarged view of area B in the middle;

[0030] Figure 9 This is a three-dimensional structural diagram of the support rod, the first connecting plate, and the support assembly of the present invention.

[0031] Figure 10 for Figure 9 Enlarged view of the area at point C;

[0032] Figure 11 for Figure 9 Enlarged view of the area at point D.

[0033] The markings in the attached diagram are as follows: 1-Dust collector frame, 1001-Air inlet, 1002-Air outlet, 1003-Partition plate, 1004-Top plate, 1005-Inspection door, 2-Cloth bag, 2001-Fixing block, 2002-Limiting groove, 3-Support rod, 4-Support ring, 4001-Blowing hole, 5-First air supply pipe, 201-First driving component, 202-First connecting plate, 203-Airbag, 204-Second air supply pipe, 205-Flow equalization plate, 206-Second driving component, 207-Fixing frame, 208-Shielding ring, 301-Second connecting plate, 30101-Fixing rod, 30102-Limiting rod, 302-Sliding rod, 30201-Handle, 30202-Support block, 30203-Protruding block, 303-Electromagnet. Detailed Implementation

[0034] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] Example 1: Refer to Figures 1-11 As shown, a device for recycling tail gas in calcium carbonate processing includes a dust collector frame 1 and filter bags 2. An air inlet 1001 is provided on the lower side of the dust collector frame 1, and the air inlet 1001 is connected to a tail gas pipeline. An air outlet 1002 is provided on the upper side of the dust collector frame 1, and the air outlet 1002 is connected to an external air pump. Two symmetrical top plates 1004 are rotatably connected to the upper side of the dust collector frame 1. A partition 1003 is provided inside the dust collector frame 1, dividing the dust collector frame 1 into an upper chamber and a lower chamber. Several rectangularly distributed filter bags 2 are installed on the partition 1003. The filter bags 2 are cylindrical in shape, and their upper openings are connected to the upper chamber.

[0036] It also includes a first driving component 201, a first connecting plate 202, support rods 3, support rings 4, and a first air supply pipe 5; two symmetrical first driving components 201 are installed inside the dust collector frame 1, and the first driving component 201 is an electric push rod; the telescopic ends of all the first driving components 201 are connected to the first connecting plate 202; several support rods 3 are fixedly connected to the first connecting plate 202; each support rod 3 is located inside an adjacent filter bag 2; four support rings 4 are fixedly connected to each support rod 3; the support rings 4 are in contact with the inner wall of the adjacent filter bag 2; each support ring 4 has a cavity inside; several air blowing holes 4001 are opened on the circumferential surface of each support ring 4 and are connected to the cavity of the adjacent support ring 4; a first air supply pipe 5 is fixedly connected to each support rod 3; the first air supply pipe 5 is connected to the cavity of the adjacent support ring 4; all the first air supply pipes 5 are connected to an external air supply device.

[0037] Furthermore, to prevent the support rod 3 from bending and deforming during movement, the support rod 3 is made of aluminum alloy tube with good bending resistance.

[0038] It also includes an airbag 203 and a second air supply pipe 204; two airbags 203 are fixedly connected to each support ring 4; the two airbags 203 are located on the upper and lower sides of the adjacent air inlet 4001 respectively; a second air supply pipe 204 is fixedly connected to each support rod 3; each second air supply pipe 204 is connected to the adjacent airbag 203; all the second air supply pipes 204 are connected to the external air supply device.

[0039] It also includes a flow equalization plate 205; several flow equalization plates 205 are fixedly connected to the lower side of the partition plate 1003; the flow equalization plate 205 is cylindrical; several air vents are arranged in a ring on the flow equalization plate 205; each flow equalization plate 205 covers the outside of the adjacent cloth bag 2.

[0040] It also includes a second drive unit 206, a fixed frame 207, and a shielding ring 208; two symmetrical second drive units 206 are fixedly connected inside the dust collector frame 1, and the second drive unit 206 is an electric push rod; the telescopic ends of all the second drive units 206 are fixedly connected to the fixed frame 207; several shielding rings 208 are fixedly connected to the fixed frame 207; each shielding ring 208 is in contact with the inner side of the adjacent flow equalization plate 205; each shielding ring 208 has ventilation holes that are distributed in the same way as the flow equalization plate 205.

[0041] It also includes a support assembly; the support assembly includes a second connecting plate 301, a sliding rod 302, and an electromagnet 303; each support rod 3 is a hollow structure; the second connecting plate 301 is slidably connected to the first connecting plate 202; several fixing rods 30101 are provided on the second connecting plate 301; several sliding rods 302 are installed on each fixing rod 30101; each sliding rod 302 is located inside an adjacent support rod 3; a support block 30202 is provided at the bottom of each sliding rod 302; a fixing block 2001 is provided at the bottom of each filter bag 2; adjacent fixing blocks 2001 and support blocks 30202 are vertically aligned; two symmetrical electromagnets 303 are installed inside the dust collector frame 1; each electromagnet 303 is in contact with the bottom surface of the adjacent second connecting plate 301; the contact parts between each second connecting plate 301 and the electromagnet 303 are made of magnetic material.

[0042] Each sliding rod 302 is provided with a handle 30201 on its upper side; each fixed rod 30101 is provided with several limiting rods 30102, and the limiting rods 30102 are respectively located on the front and rear sides of the adjacent handles 30201; each sliding rod 30202 at the bottom of the support block 30202 is provided with two protrusions 30203; each fixed block 2001 is provided with two limiting grooves 2002 whose shape corresponds to the adjacent protrusions 30203.

[0043] Furthermore, to facilitate the connection between the support block 30202 and the fixing block 2001, both the support block 30202 and the fixing block 2001 are made of magnetic material.

[0044] The following is a detailed description of the process for filtering dust particles in the exhaust gas generated during calcium carbonate processing:

[0045] In the initial state, the external air pump connected to the air outlet 1002 starts to draw air. The exhaust gas enters the lower chamber inside the dust collector frame 1 through the air inlet 1001, then enters the upper chamber through the filter bag 2 and its upper opening, and finally exits from the air outlet 1002. During this process, the inner wall of the filter bag 2 is supported by the support ring 4 to keep the filter bag 2 cylindrical, so that the exhaust gas can pass through the inside of the filter bag 2. In addition, the filter bag 2 intercepts dust particles in the exhaust gas and traps them on the outside. It should be noted that in order to prevent the support rod 3 from bending and deforming during subsequent movement, the support rod 3 is made of aluminum alloy tube with good bending resistance. When a lot of dust accumulates on the outside of the filter bag 2, it is necessary to clean the dust on the outside of the filter bag 2. The specific steps are as follows: first, control the external air pump to stop drawing air, and at the same time control the external air pump to stop drawing air. The air supply device delivers compressed air into the first air pipe 5, allowing the air to enter the internal cavity of the support ring 4. The air is then sprayed onto the inner wall of the filter bag 2 through the annularly arranged air blowing holes 4001, causing the air to pass through the filter bag 2 and blow away the dust on the outside. At the same time, the first drive unit 201 is controlled to move the first connecting plate 202, the support rod 3, and the support ring 4 downward, causing the support ring 4 to continuously move downward against the inner wall of the filter bag 2. This allows the compressed air to clean the dust on the outside of the filter bag 2 from top to bottom, causing the dust to detach from the filter bag 2 and fall into the collection chamber at the lower inner side of the dust collector frame 1. The dust in the dust collector frame 1 is then drawn away through the pipe. After the dust on the outside of the filter bag 2 is cleaned, the first drive unit 201 is controlled to move the support ring 4 upward to the initial position, and the filter bag 2 can then be used for the exhaust gas treatment process.

[0046] Conventional baghouse dust collectors typically have an air jet pipe installed above the filter bag 2. Compressed airflow is blown through the air jet pipe towards the inside of the filter bag 2, and then through the filter bag 2 to the outside of the dust. However, in this process, the bottom of the filter bag 2 is far from the air jet pipe, and the force of the compressed airflow blowing towards the filter bag 2 is small. Therefore, the cleaning effect of the airflow on the bottom of the filter bag 2 is poor. Compared with conventional baghouse dust collectors, by controlling the downward movement of the support ring 4, it is ensured that the compressed airflow can be blown evenly onto the circumferential surface of the filter bag 2, thereby improving the cleaning effect of the compressed airflow on the filter bag 2.

[0047] Based on this, considering that after dust adheres to the outside of the bag 2, some dust can easily enter the pores of the bag 2, making it difficult to clean the dust inside the pores, before blowing air into the support ring 4, the external air supply device is controlled to supply air to the airbag 203 through the second air supply pipe 204, causing the airbag 203 to inflate radially until the diameter of the airbag 203 is greater than the outer diameter of the support ring 4, and two adjacent airbags 203 are located on the upper and lower sides of the corresponding support ring 4, respectively, so that the part of the bag 2 located between the two airbags 203 is supported by the airbag 2. The compression at 03 causes the corresponding part of the cloth bag 2 to expand, increasing its pore size. Then, the external air supply device is controlled to supply air into the support ring 4, causing the compressed airflow to blow onto the expanded part of the cloth bag 2 and hold for 2 seconds. Then, the external air supply device is controlled to evacuate the airbag 203, causing the airbag 203 to retract and reset. Subsequently, the support ring 4 continues to move downward, and the airbag 203 is controlled to inflate again to expand the cloth bag 2, so that the circumferential surface of the cloth bag 2 is expanded by the airbag 203. This facilitates the compressed airflow to blow out the dust in the pores, further improving the cleaning effect.

[0048] Based on this, considering that the dust on the outside of bag 2, after being blown away by the compressed airflow, will also be blown to the outside of adjacent bag 2, thus requiring repeated cleaning of bag 2 and reducing cleaning efficiency, therefore, in the initial state, such as Figure 7 As shown, the vent holes of the flow equalization plate 205 and the vent holes of the shielding ring 208 are in an overlapping state. The exhaust gas first passes through the vent holes of the flow equalization plate 205 and the vent holes of the shielding ring 208, and then flows into the interior of the filter bag 2. During this process, the exhaust gas flow is slowed down and dispersed by the uniform vent holes on the flow equalization plate 205, which helps the exhaust gas to flow smoothly to the circumferential surface of the filter bag 2. When the filter bag 2 is cleaned, the second driving component 206 is controlled to drive the fixing frame 207 and the shielding ring 208 to move downward, so that the vent holes of the shielding ring 208 are misaligned with the vent holes of the flow equalization plate 205. In this way, the shielding ring 208 blocks the vent holes of the flow equalization plate 205 near the support ring 4, and the flow equalization plate 205 blocks the vent holes on the shielding ring 208, thereby preventing dust from being blown out by the compressed airflow and splashing onto the adjacent filter bag 2.

[0049] When the support ring 4 moves downward until the bottommost support ring 4 is in contact with the bottom of the bag 2, the external air supply device is first controlled to evacuate the airbag 203, so that the airbag 203 is in its initial retracted state. Then, the support ring 4 is controlled to move upward to reset. However, considering the friction between the support ring 4 and the bag 2, when the support ring 4 moves upward, there is a possibility that the support ring 4 will pull the bag 2 upward with it, which may cause the bag 2 to fold, thus reducing the subsequent filtration efficiency of the bag 2. Therefore, when the first driving member 201 drives the first connecting plate 202 downward, it simultaneously drives the second connecting plate 301 and its connecting parts downward. Figures 9-11As shown, when the support block 30202 at the bottom of the sliding rod 302 contacts the fixing block 2001 at the bottom of the bag 2, the first connecting plate 202 and the second connecting plate 301 are controlled to stop moving. In the initial state, the handle 30201 of the sliding rod 302 is engaged with the limiting rod 30102, and the electromagnet 303 is attached to the lower side of the second connecting plate 301. The electromagnet 303 is controlled to be magnetized, so that the electromagnet 303 attracts the second connecting plate 301. When the first driving member 201 drives the support rod 3 and the support ring 4 to move downward, the sliding rod 302 is in a stationary state. When the support ring 4 moves upward to reset, the bottom of the bag 2 is supported by the sliding rod 302, preventing the support ring 4 from driving the bag 2 to move upward together, so that the circumferential surface of the bag 2 is always in a flat state, thereby ensuring the filtration quality of the bag 2.

[0050] Furthermore, considering that the filter bag 2 needs deep cleaning or replacement after long-term use, it needs to be removed from the partition 1003. During the removal process, dust on the outside of the filter bag 2 is prone to scattering, increasing the difficulty of cleaning, and workers are likely to inhale the dust, thus affecting their health. Therefore, the process of removing the filter bag 2 is described in detail below. First, ensure that the dust collector frame 1 is in a stopped state. Workers climb to the top of the dust collector frame 1 using a ladder and open the top plate 1004. The top plate 1004 is opened as follows: Figure 2As shown, the worker then stands on the second connecting plate 301, and using a top-down view as a reference, rotates the handle 30201 of the sliding rod 302 90 degrees clockwise, thereby disengaging the handle 30201 from the limiting rod 30102 on the fixed rod 30101. Simultaneously, the protrusion 30203 on the support block 30202 also rotates 90 degrees clockwise, causing the protrusion 30203 to engage with the limiting groove 2002 of the fixed block 2001, achieving a temporary connection between the protrusion 30203 and the support block 30202. Note that at this time, the electromagnet 303 is in a stopped magnetizing state, controlling the first drive... The actuator 201 drives the first connecting plate 202 and the second connecting plate 301 to move upward, thereby causing the support ring 4 and the sliding rod 302 to move upward together. When the lowest support ring 4 disengages from the bag 2, the upward movement stops. Meanwhile, because the sliding rod 302 simultaneously drives the bottom of the bag 2 to move upward, the bag 2 is in a folded state. Then, the worker stands on the second connecting plate 301 and pulls the sliding rod 302 upward, causing the support block 30202 to move upward within the support rod 3, thereby pulling the bag 2 into the support rod 3. Note that at this time, the outer part of the bag 2, excluding the upper open side, faces upward. The bag 2 is flipped inwards towards the axis of the support rod 3, while the upper opening side of the bag 2 remains fixed to the partition 1003 and cannot be flipped. After most of the bag 2 has entered the support rod 3, the opening of the bag 2 is removed from the partition 1003 and folded in half to close it. Then, using a top-down view as a reference, the sliding rod 302 is rotated 90 degrees counterclockwise, thereby disengaging the protrusion 30203 from the limiting groove 2002, so that the support block 30202 and the fixing block 2001 are separated. The bag 2 is then pulled out from the support rod 3. Since the outer side of the bag 2 is folded inwards and the opening of the bag 2 is sealed, The dust on this cloth bag 2 will not spread everywhere, reducing the difficulty of cleaning and preventing workers from inhaling dust. After all the cloth bags 2 are removed, new cloth bags 2 are installed on the partition 1003. Then, the first drive component 201 is controlled to drive the support ring 4 and the sliding rod 302 to re-insert into the corresponding cloth bag 2. It should be noted that since the support block 30202 and the fixing block 2001 are both made of magnetic materials, when the support block 30202 moves to the bottom of the cloth bag 2, the attraction between the support block 30202 and the fixing block 2001 can achieve precise docking.

[0051] Example 2: Based on Example 1, referring to... Figure 1 As shown, furthermore, to facilitate the internal cleaning of the dust collector frame 1, an inspection door 1005 is provided on the dust collector frame 1.

[0052] Considering that a thick layer of dust will accumulate inside the dust collector frame 1 after long-term use, in order to prevent the dust from accumulating and agglomerating, which would increase the difficulty of subsequent cleaning, the staff can periodically open the maintenance door 1005 so that the external cleaning device can enter the dust collector frame 1 through the maintenance door 1005 and use the cleaning equipment to clean the inside of the dust collector frame 1, the outside of the flow equalization plate 205, and the shielding ring 208.

[0053] A process for recycling tail gas during calcium carbonate processing includes the following steps:

[0054] S1: Cooling. The carbon dioxide-containing exhaust gas from the calcination of calcium carbonate is transported through a pipeline to a cooler for cooling, and then the cooled exhaust gas is transported to a dust collector.

[0055] S2: Filtration, which uses a dust collector to intercept dust particles in the exhaust gas and regularly cleans and collects the intercepted dust particles;

[0056] S3: Recovery. The filtered exhaust gas is stored in a special container. In the subsequent carbonation reaction process, the exhaust gas containing carbon dioxide is passed into lime water to generate calcium carbonate precipitate.

[0057] Although this disclosure has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made to this disclosure without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Therefore, the scope of this disclosure should not be limited to the above embodiments, but should be defined not only by the appended claims, but also by their equivalents.

Claims

1. A device for recycling tail gas in calcium carbonate processing, comprising a dust collector frame (1); an air inlet (1001) is provided on the lower side of the dust collector frame (1), the air inlet (1001) being connected to a tail gas pipeline; an air outlet (1002) is provided on the upper side of the dust collector frame (1), the air outlet (1002) being connected to an external air pump; two symmetrical top plates (1004) are rotatably connected to the upper side of the dust collector frame (1); a partition (1003) is provided inside the dust collector frame (1); the partition (1003) divides the dust collector frame (1) into an upper chamber and a lower chamber; a plurality of rectangularly distributed cloth bags (2) are installed on the partition (1003); the cloth bags (2) are cylindrical in shape; the upper opening of the cloth bags (2) is connected to the upper chamber; characterized in that, It also includes a first drive component (201); several first drive components (201) are installed inside the dust collector frame (1); a first connecting plate (202) is connected to the telescopic end of all the first drive components (201); several support rods (3) are fixedly connected to the first connecting plate (202); each support rod (3) is located inside the adjacent bag (2); several support rings (4) are fixedly connected to each support rod (3); the support rings (4) are in contact with the inner wall of the adjacent bag (2); each support ring (4) has a cavity inside; several air blowing holes (4001) for cleaning the dust attached to the inner wall of the bag (2) are opened on the circumferential ring surface of each support ring (4), and are connected to the cavity of the adjacent support ring (4); a first air supply pipe (5) is fixedly connected to each support rod (3); the first air supply pipe (5) is connected to the cavity of the adjacent support ring (4); all the first air supply pipes (5) are connected to the external air supply device. It also includes airbags (203); two airbags (203) for expanding the cloth bag (2) are fixedly attached to each support ring (4); the two airbags (203) are located on the upper and lower sides of the adjacent air inlet (4001) respectively; a second air supply pipe (204) is fixedly attached to each support rod (3); each second air supply pipe (204) is connected to the adjacent airbag (203); all the second air supply pipes (204) are connected to the external air supply device; It also includes a flow equalization plate (205); several flow equalization plates (205) are fixedly connected to the lower side of the partition plate (1003) to slow down and disperse the exhaust gas flow; the flow equalization plate (205) is cylindrical; several air vents are provided on the flow equalization plate (205) in a ring arrangement; each flow equalization plate (205) covers the outside of the adjacent cloth bag (2); It also includes a second drive unit (206); several second drive units (206) are fixedly connected inside the dust collector frame (1); all the telescopic ends of the second drive units (206) are fixedly connected to a fixed frame (207); several shielding rings (208) are fixedly connected to the fixed frame (207); each shielding ring (208) is in contact with the inner side of the adjacent flow equalization plate (205); each shielding ring (208) has ventilation holes that are distributed in the same way as the flow equalization plate (205).

2. The device for recycling tail gas in calcium carbonate processing according to claim 1, characterized in that, The support rod (3) is made of aluminum alloy tube with good bending resistance.

3. The device for recycling tail gas in calcium carbonate processing according to claim 1, characterized in that, It also includes a support assembly; the support assembly includes a second connecting plate (301); each support rod (3) is a hollow structure; the second connecting plate (301) is slidably connected to the first connecting plate (202); a number of fixed rods (30101) are provided on the second connecting plate (301); a number of sliding rods (302) are installed on each fixed rod (30101); each sliding rod (302) is located inside the adjacent support rod (3); each sliding rod (302) has a bottom setting There are support blocks (30202) for supporting the bottom of the filter bag (2); each filter bag (2) has a fixing block (2001) at the bottom; the adjacent fixing blocks (2001) and support blocks (30202) are vertically aligned; several electromagnets (303) are installed inside the dust collector frame (1); each electromagnet (303) is attached to the bottom surface of the adjacent second connecting plate (301); the contact parts between each second connecting plate (301) and the electromagnet (303) are made of magnetic material.

4. The device for recycling tail gas in calcium carbonate processing according to claim 3, characterized in that, Each sliding rod (302) is provided with a handle (30201) on its upper side; each fixed rod (30101) is provided with several limiting rods (30102), and the limiting rods (30102) are located on the front and rear sides of the adjacent handles (30201); each sliding rod (30202) at the bottom of the support block (30202) is provided with two protrusions (30203) for cooperating with and connecting the fixed block (2001); each fixed block (2001) is provided with two limiting grooves (2002) whose shape corresponds to the adjacent protrusions (30203).

5. A device for recycling tail gas in calcium carbonate processing according to claim 4, characterized in that, Both the support block (30202) and the fixing block (2001) are made of magnetic material.

6. The device for recycling tail gas in calcium carbonate processing according to claim 3, characterized in that, The dust collector frame (1) is equipped with an inspection door (1005).

7. A method for recycling tail gas in calcium carbonate processing, characterized in that: This method uses the tail gas recycling device for calcium carbonate processing as described in claim 6, and includes the following steps: S1: Cooling. The carbon dioxide-containing exhaust gas from the calcination of calcium carbonate is transported through a pipeline to a cooler for cooling, and then the cooled exhaust gas is transported to a dust collector. S2: Filtration, which uses a dust collector to intercept dust particles in the exhaust gas and regularly cleans and collects the intercepted dust particles; S3: Recovery. The filtered exhaust gas is stored in a special container. In the subsequent carbonation reaction process, the exhaust gas containing carbon dioxide is passed into lime water to generate calcium carbonate precipitate.

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