Nitrogen recovery system for calcium carbide furnace

Abstract

The invention relates to the technical field of industrial gas recycling, in particular to a calcium carbide furnace nitrogen recycling system. Comprising a purified ash silo and a primary filtering mechanism arranged on one side of the purified ash silo, the primary filtering mechanism comprises an air inlet hopper located on one side of the purified ash silo, the inner wall of the air inlet hopper is sequentially connected with a first filter screen, a second filter screen and a third filter screen in a clamped mode through a plurality of clamping blocks, and the net diameters of the first filter screen, the second filter screen and the third filter screen are different. And the top end of the air inlet hopper is fixedly connected with a table bin top dust removal box body, an air injection filtering structure is arranged on the inner wall of the table bin top dust removal box body, a secondary dust filtering mechanism is arranged on the other side of the outer wall of the purification ash silo, and a control conveying mechanism is arranged on the position, located on one side of the primary filtering mechanism, of the rear end face of the purification ash silo. The device has the beneficial effects that dust-containing nitrogen is subjected to staged purification, the purity of recovered nitrogen is guaranteed, nitrogen is recycled, and the use cost is saved.

Description

Technical Field

[0001] This invention relates to the field of industrial gas recovery and utilization technology, specifically a nitrogen recovery system for a calcium carbide furnace. Background Technology

[0002] Nitrogen recovery utilizes nitrogen to transport ash collected by the dust collector during the calcium carbide furnace production process. This ash, known in the industry as purification ash, has a temperature of 100-200℃ and is composed of dust collector ash. Its composition is somewhat complex, containing carbon, calcium oxide, magnesium oxide, silicon dioxide, and tar, etc. The particles are relatively fine, less than 1 mm, and it is sticky. The ash hopper contains a certain amount of carbon monoxide, which is an explosive gas. Its bulk density is 0.35-0.45 t / m3, and its temperature is 120-180 degrees Celsius. This ash is easily combustible when exposed to air, so nitrogen is used for transportation.

[0003] In the prior art, patent document CN219384022U discloses a nitrogen recovery system for calcium carbide furnaces. This system includes a large silo, a silo top separator, a precooler, a dust filter, a low-pressure nitrogen storage tank, an automatic discharge valve assembly, a first filter, a main compressor, a backup compressor, and a high-pressure nitrogen storage tank. This invention ultimately collects the nitrogen from the large silo into the high-pressure nitrogen storage tank. The recovered nitrogen can be used to re-purge purified ash, achieving nitrogen recycling, saving nitrogen resources, and solving the problem of nitrogen resource waste caused by transporting purified ash to the large silo in the prior art.

[0004] However, its filtration mechanism has a single specification, and the nitrogen gas after use carries a large amount of sticky ash and carbon monoxide. Direct recycling can easily cause blockage of subsequent pipelines, and the filtration efficiency drops sharply after the filter media is blocked. The control and transmission system has poor coordination and cannot adjust the recycling process in real time according to the nitrogen purity, resulting in unstable purity of the recycled nitrogen, which is difficult to meet the requirements for recycling. Based on this, the present invention provides a calcium carbide furnace nitrogen recovery system to solve the problems mentioned in the background art. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing a nitrogen recovery system for a calcium carbide furnace, which has the advantages of graded purification of dusty nitrogen, ensuring the purity of recovered nitrogen, recycling nitrogen, and saving operating costs.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A nitrogen recovery system for a calcium carbide furnace includes a purified ash silo and a primary filtration mechanism disposed on one side of the purified ash silo. The primary filtration mechanism includes an air inlet hopper located on one side of the purified ash silo. A cleaning port is opened on one side of the outer wall of the air inlet hopper, and a first filter screen, a second filter screen, and a third filter screen are sequentially engaged by multiple locking blocks on the inner wall of the air inlet hopper. The mesh diameters of the first filter screen, the second filter screen, and the third filter screen are all different. A dust collector box is fixedly connected to the top of the air inlet hopper, and an air jet filtration structure is provided on the inner wall of the dust collector box.

[0007] A secondary dust filtration mechanism is provided on the other side of the outer wall of the purification ash silo.

[0008] The rear end face of the purified ash silo is located on one side of the primary filtration mechanism and is equipped with a control and transmission mechanism.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the air inlet hopper of the primary filtration mechanism is fixed to one side of the purified ash silo, and adopts a conical steel structure. The inner wall is detachably connected to the first, second, and third filter screens through multiple locking blocks, forming a three-stage filtration. The filter screen diameter decreases sequentially: the first filter screen has a diameter of 80-100μm, removing coarse calcium carbide particles with a diameter ≥80μm; the second filter screen has a diameter of 40-60μm, filtering medium-sized dust particles; and the third filter screen has a diameter of 10-20μm, intercepting fine dust. A cleaning port is opened on one side of the outer wall of the air inlet hopper to facilitate regular disassembly, cleaning, or replacement of the filter screens, avoiding filter screen clogging and affecting filtration efficiency.

[0010] The beneficial effects of this invention are:

[0011] 1) This invention adopts a multi-stage filtration structure of "three-stage filter screen + filter bag + membrane filter bag" to classify and purify dust-containing nitrogen gas. The dust removal rate is ≥99.9%, and the purity of the recovered nitrogen gas is stable at ≥99.5%, which fully meets the requirements for recycling in the cooling and protection of calcium carbide furnaces and avoids the impact of insufficient nitrogen purity on the quality of calcium carbide production.

[0012] 2) This invention utilizes the combined action of jet cleaning in the primary filtration mechanism and the movable airflow scouring cleaning in the secondary dust filtration mechanism to thoroughly remove dust adhering to the surface of the filter material, preventing filter bag clogging and extending the service life of the filter material by 30% to 50% (the service life of traditional filter bags is 3-6 months, while this system can reach 6-9 months), thus reducing the cost of filter material replacement.

[0013] 3) This invention controls nitrogen compressors 1 and 2 in the transmission mechanism to transmit purified nitrogen to the purified ash silo, enabling the device to recycle nitrogen, saving operating costs. The system consumes very little nitrogen, only about 5% of the nitrogen used in open conveying, and the total nitrogen recovery rate is increased to over 90% (compared to 60%-70% in traditional systems), significantly reducing nitrogen waste and lowering nitrogen procurement costs for calcium carbide production. This can save companies hundreds of thousands of yuan in gas costs annually. The control box achieves fully automated control of the entire process of filtration, ash cleaning, and compression transmission, reducing manual intervention. The filter media adopts a detachable snap-fit ​​or sliding connection structure, making replacement convenient (replacement time for a single set of filter media ≤ 30 minutes). The display screen shows operating parameters in real time, and the system can automatically alarm in case of faults, reducing the difficulty of operation and maintenance and reducing manual labor intensity.

[0014] Based on the above technical solution, the present invention can be further improved as follows.

[0015] Furthermore, the jet filtration structure includes multiple partitions located on the inner wall of the dust collector box at the top of the bin. Filter bags are arranged between multiple spaces divided by the partitions on the inner wall of the dust collector box at the top of the bin. Each filter bag has an air duct fixedly connected to its top. The tops of the multiple air ducts are embedded in the table surface, which is located at the top of the inner wall of the dust collector box at the top of the bin.

[0016] Furthermore, a fixed base is fixedly connected to the top of the dust collector box on the platform top, and multiple transmission air ports are fixedly connected to one side of the outer wall of the fixed base. A transfer port is fixedly connected to the bottom of the multiple transmission air ports, and a transmission pipe is fixedly connected to one end of the multiple transmission air ports. The fixed base passes through the outer wall of the multiple transmission pipes, and an air jet is fixedly connected to the bottom of the multiple transmission pipes. The multiple air jets are all corresponding to the air guide port.

[0017] Furthermore, a top air guide seat is fixedly connected to the top of the fixed base, and a pre-filter air conduit is fixedly connected to the top of the top air guide seat.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the top of the air inlet hopper is fixedly connected to the dust collector housing on the top of the bin. The housing is made of stainless steel, and the inner wall is divided into multiple independent filter units by multiple partitions. Each unit contains a suspended filter bag made of high-temperature resistant needle-punched felt material, with a temperature resistance of 200-250℃ and a filtration accuracy of ≤5μm. The top of the filter bag is fixedly connected to an air duct, which is embedded in the table surface. The table surface seals the top of the dust collector housing on the top of the bin, ensuring that nitrogen gas only enters the air duct after being filtered by the filter bag. The top of the dust collector housing on the top of the bin is fixedly connected to a fixing base. Multiple transmission air ports are evenly distributed on one side of the outer wall of the fixed seat. The bottom of the transmission air ports is connected to the transmission pipe through the transfer port. The transmission pipe passes through the fixed seat and is fixedly connected to the air jet port at the bottom. The air jet port and the air guide port correspond one-to-one. The top air guide seat is fixedly connected to the top of the fixed seat. The top air guide seat is connected to the high-pressure air source. Air is periodically sprayed into the filter bag through the transmission air port, transmission pipe and air jet port. The reverse airflow shakes off the dust attached to the surface of the filter bag to avoid clogging. The primary filtration air duct connects the top air guide seat and the secondary dust filtration mechanism to transport the pre-purified nitrogen to the next stage.

[0019] Furthermore, the secondary dust filtration mechanism includes a secondary dust collection box located on one side of the purified ash silo. A clean air outlet pipe is fixedly connected to one side of the outer wall of the secondary dust collection box, and a top air inlet is fixedly connected to the top of the secondary dust collection box. A primary filtered air inlet pipe is fixedly connected to the top of the top air inlet.

[0020] Furthermore, limit sliders are fixedly connected to both sides of the inner wall of the secondary dust collector. A membrane filter bag layer is slidably connected to the inner wall of each of the limit sliders via sliding blocks. Sliding rods are fixedly connected to both sides of the inner wall of the secondary dust collector between the limit sliders. Sliding sleeves are slidably connected to the outer wall of each of the sliding rods. An extension rod is fixedly connected to one side of each of the sliding sleeves. The extension rods are grouped in pairs, and an air pipe is fixedly connected between each pair of extension rods.

[0021] Furthermore, an air pump is installed on one side of the outer wall of each of the extension rods. The input end of the air pump is connected to a pump box, and the output end of the air pump is fixedly connected to an air pump transmission pipe. The end of the air pump transmission pipe away from the air pump is fixedly connected to an airflow flushing pipe through a guide port. Each of the bottom ends of the multiple airflow flushing pipes has an air port, and a transverse airflow flushing pipe is connected between the bottom ends of the multiple air ports.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the secondary dust collection box of the secondary dust filtration mechanism is set on the other side of the outer wall of the purification ash silo, and adopts a sealed steel structure. A clean air outlet pipe is fixedly connected to one side of the outer wall to discharge the nitrogen after deep purification. The top air inlet is fixedly connected to the top air inlet, which is connected to the primary filter air inlet pipe through the primary filter air inlet pipe to receive the nitrogen after preliminary purification. Multiple limiting sliders are symmetrically fixed on both sides of the inner wall of the secondary dust collection box. The inner wall of the limiting slider is slidably connected to the membrane filter bag layer through the sliding block. The cooperation between the sliding block and the limiting slider facilitates the disassembly and replacement of the membrane filter bag layer, reducing maintenance difficulty. Sliding rods are fixed on both sides of the inner wall of the secondary dust collector between the limiting sliders. Sliding sleeves are slidably connected to the outer walls of the sliding rods. Extension rods are fixed to one side of the sliding sleeves, and air pipes are fixed between pairs of extension rods, forming a movable cleaning air pipe support. An air pump is installed on one side of the outer wall of the extension rods. The air pump input is connected to the pump box, and the output is connected to the airflow flushing pipe through the air pump transmission pipe and guide port. Multiple air ports are opened at the bottom of the airflow flushing pipe, and these ports are connected to transverse airflow flushing pipes, forming a multi-directional airflow flushing structure. During cleaning, the air pump drives the airflow through the air ports and transverse airflow flushing pipes to spray high-pressure airflow onto the membrane filter bag layer. Simultaneously, the sliding sleeve moves along the sliding rods, achieving comprehensive cleaning of the membrane filter bag layer and ensuring that the filter bags maintain a high-efficiency filtration state for a long time.

[0023] Furthermore, the control and transmission mechanism includes a fixed frame located on one side of the clean ash silo. An air inlet hopper is fixedly connected to one side of the top of the fixed frame, and a nitrogen compressor is installed at the end of the fixed frame away from the air inlet hopper. A nitrogen transmission pipe is fixedly connected to the output end of the nitrogen compressor, and the input end of the nitrogen compressor is connected to the secondary dust removal box. A control box is fixedly connected to the top of the fixed frame on one side of the nitrogen compressor. A nitrogen compressor is installed on one side of the outer wall of the fixed frame. The input end of the nitrogen compressor is connected to the clean ash silo, and the nitrogen compressor is connected to the air inlet through a transmission pipe.

[0024] Furthermore, a display screen is provided on the front end of the purified ash silo, and the display screen is electrically connected to the control box.

[0025] The beneficial effects of adopting the above-mentioned further scheme are that the fixed frame of the control and transmission mechanism is set on one side of the rear end face of the purified ash silo, using a steel structure support, with an air inlet hopper fixed on one side of the top, providing support for the primary filtration mechanism. A nitrogen compressor is installed at the end of the fixed frame away from the air inlet hopper; its input end is connected to the clean air outlet pipe of the secondary dust removal box, and its output end compresses and stores the deeply purified nitrogen into the purified ash silo through a nitrogen transmission pipe for power stone furnace recycling. A nitrogen compressor is installed on one side of the outer wall of the fixed frame; its input end is connected to the purified ash silo, used to extract residual nitrogen in the purified ash silo, and transport it to the air inlet hopper through a transmission pipe and air inlet, realizing secondary nitrogen recovery and improving the recovery rate. A control box is fixedly connected to the top of the fixed frame on one side of the nitrogen compressor, containing a built-in PLC controller, which is electrically connected to the air pump, nitrogen compressor one, nitrogen compressor two, and various sensors to achieve automated control of the entire process of filtration, ash removal, compression, and transmission. A display screen is installed on the front side of the purification ash silo and is electrically connected to the control box. It displays parameters such as nitrogen purity, pressure, and filter bag pressure difference in real time, which makes it easy for operators to monitor the system's operating status and handle abnormal situations in a timely manner. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 This is a multi-angle three-dimensional structural schematic diagram of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection of the control and transmission mechanism of the present invention;

[0029] Figure 4 This is a schematic diagram of the connection structure of the dust removal box on the top of the platform of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the initial filtration mechanism of the present invention;

[0031] Figure 6 For the present invention Figure 2 Schematic diagram of the secondary dust filtration mechanism;

[0032] Figure 7 For the present invention Figure 2 Schematic diagram of the internal structure of the secondary dust collector;

[0033] Figure 8 This is a schematic diagram of the tracheal tube connection structure of the present invention;

[0034] Figure 9 For the present invention Figure 4 Enlarged structural diagram at point A;

[0035] Figure 10 For the present invention Figure 6 A magnified structural diagram at point B in the middle.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Clean ash silo; 2. Display screen; 3. Air inlet; 4. Air inlet hopper; 41. Clamping block; 42. First filter screen; 43. Cleaning port; 44. Second filter screen; 45. Third filter screen; 46. Dust collector box on top of the silo; 47. Partition; 48. Filter bag; 49. Air duct; 410. Tabletop; 411. Fixing base; 412. Transfer port; 413. Transmission air port; 414. Transmission pipe; 415. Air jet port; 416. Top air guide seat; 417. Pre-filtered air duct; 5. Fixing frame; 51. Nitrogen compressor one; 52. 53. Control box; 54. Nitrogen transmission pipe; 55. Nitrogen compressor II; 6. Transmission air pipe; 7. Secondary dust removal box; 8. Clean air outlet pipe; 9. Top air inlet; 10. Primary filtered air inlet pipe; 11. Limiting slider; 12. Membrane filter bag layer; 13. Pump box; 14. Slide rod; 15. Sliding sleeve; 16. Extension rod; 17. Air pipe; 18. Air pump; 19. Air pump transmission pipe; 20. Inlet; 10. Air scouring pipe; 10. Air port; 11. Lateral air scouring pipe; 12. Sliding block. Detailed Implementation

[0038] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0039] The present invention provides the following preferred embodiments.

[0040] like Figure 1-10 As shown, a nitrogen recovery system for a calcium carbide furnace includes a purified ash silo 1 and a primary filtration mechanism disposed on one side of the purified ash silo 1. The primary filtration mechanism includes an air inlet hopper 4 located on one side of the purified ash silo 1. A cleaning port 43 is provided on one side of the outer wall of the air inlet hopper 4, and a first filter screen 42, a second filter screen 44 and a third filter screen 45 are sequentially engaged by multiple locking blocks 41 on the inner wall of the air inlet hopper 4. The mesh diameters of the first filter screen 42, the second filter screen 44 and the third filter screen 45 are all different. A dust collector box 46 is fixedly connected to the top of the air inlet hopper 4, and an air jet filtration structure is provided on the inner wall of the dust collector box 46.

[0041] The air inlet hopper 4 of the primary filtration mechanism is fixed to one side of the purified ash silo 1. It adopts a conical steel structure, and the inner wall is detachably connected to the first filter screen 42, the second filter screen 44, and the third filter screen 45 via multiple locking blocks 41, forming a three-stage filtration system. The filter screen diameters decrease sequentially: the first filter screen 42 has a diameter of 80-100μm, removing coarse calcium carbide particles with a diameter ≥80μm; the second filter screen 44 has a diameter of 40-60μm, filtering medium-sized dust particles; and the third filter screen 45 has a diameter of 10-20μm, intercepting fine dust. A cleaning port 43 is opened on one side of the outer wall of the air inlet hopper 4 to facilitate regular disassembly, cleaning, or replacement of the filter screens, avoiding filter screen clogging and affecting filtration efficiency.

[0042] The jet filtration structure includes multiple partitions 47 located on the inner wall of the dust collector 46 at the top of the bin. Filter bags 48 are arranged between multiple spaces divided by the partitions 47 on the inner wall of the dust collector 46. Each filter bag 48 has an air duct 49 fixedly connected to its top. The tops of the multiple air ducts 49 are embedded in a tabletop 410, which is located at the top of the inner wall of the dust collector 46. A fixing seat 411 is fixedly connected to the top of the dust collector 46, and multiple air ducts are fixedly connected to one side of the outer wall of the fixing seat 411. A transmission port 413 is provided, and a transfer port 412 is fixedly connected to the bottom of the multiple transmission ports 413. A transmission pipe 414 is fixedly connected to one end of the multiple transmission ports 413. A fixing seat 411 passes through the outer wall of the multiple transmission pipes 414. An air jet 415 is fixedly connected to the bottom of the multiple transmission pipes 414. The multiple air jets 415 are all corresponding to the air guide port 49. A top air guide seat 416 is fixedly connected to the top of the fixing seat 411. A primary filter air guide pipe 417 is fixedly connected to the top of the top air guide seat 416.

[0043] The top of the air inlet hopper 4 is fixedly connected to the dust collector housing 46 on the top of the bin. The housing is made of stainless steel, and its inner wall is divided into multiple independent filter units by multiple partitions 47. Each unit contains a suspended filter bag 48, which is made of high-temperature resistant needle-punched felt material with a temperature resistance of 200-250℃ and a filtration accuracy of ≤5μm. The top of the filter bag 48 is fixedly connected to an air guide port 49, which is embedded in the table surface 410. The table surface 410 seals the top of the dust collector housing 46, ensuring that nitrogen gas only enters the air guide port 49 after being filtered by the filter bag 48. The top of the dust collector housing 46 is fixedly connected to a fixing seat 411, and multiple transmission air ports 41 are evenly distributed on one side of the outer wall of the fixing seat 411. 3. The bottom end of the transmission port 413 is connected to the transmission pipe 414 through the transfer port 412. The transmission pipe 414 passes through the fixed base 411 and is fixedly connected to the air jet port 415 at its bottom end. The air jet port 415 corresponds one-to-one with the air guide port 49. The top air guide seat 416 is fixedly connected to the top of the fixed base 411. The top air guide seat 416 is connected to a high-pressure air source. Air jets are periodically sprayed into the filter bag 48 through the transmission port 413, the transmission pipe 414 and the air jet port 415. The reverse airflow shakes off the dust adhering to the surface of the filter bag to avoid clogging. The primary filtration air duct 417 is connected to the top air guide seat 416 and the secondary dust filtration mechanism to transport the pre-purified nitrogen to the next stage.

[0044] A secondary dust filtration mechanism is installed on the other side of the outer wall of the clean ash silo 1. The secondary dust filtration mechanism includes a secondary dust collector 6 located on one side of the clean ash silo 1. A clean air outlet pipe 61 is fixedly connected to one side of the outer wall of the secondary dust collector 6, and a top air inlet 62 is fixedly connected to the top of the secondary dust collector 6. A primary filtered air inlet pipe 63 is fixedly connected to the top of the top air inlet 62. Limiting sliders 64 are fixedly connected to both sides of the inner wall of the secondary dust collector 6. A membrane filter bag layer 65 is slidably connected to the inner wall of the multiple limiting sliders 64 through sliding blocks 617. Sliding rods 67 are fixedly connected to both sides of the inner wall of the secondary dust collector 6 between the multiple limiting sliders 64. The outer walls of the multiple sliding rods 67 are slidably connected to... A sliding sleeve 68 is provided, and an extension rod 69 is fixedly connected to one side of each sliding sleeve 68. The extension rods 69 are arranged in pairs, and an air pipe 610 is fixedly connected between each pair of extension rods 69. An air pump 611 is provided on one side of the outer wall of each extension rod 69. The input end of the air pump 611 is connected to the pump box 66, and the output end of the air pump 611 is fixedly connected to the air pump transmission pipe 612. The end of the air pump transmission pipe 612 away from the air pump 611 is fixedly connected to the airflow flushing pipe 614 through the guide port 613. An air port 615 is opened at the bottom end of each airflow flushing pipe 614, and a transverse airflow flushing pipe 616 is connected between the bottom ends of the multiple air ports 615.

[0045] The secondary dust collection box 6 of the secondary dust collection mechanism is located on the other side of the outer wall of the purification ash silo 1. It adopts a sealed steel structure. A clean air outlet pipe 61 is fixedly connected to one side of the outer wall to discharge the deeply purified nitrogen. A top air inlet 62 is fixedly connected to the top. The top air inlet 62 is connected to the primary filter air inlet pipe 63 and the primary filter air conduit 417 to receive the pre-purified nitrogen. Multiple limiting sliders 64 are symmetrically fixed on both sides of the inner wall of the secondary dust collection box 6. The inner wall of the limiting sliders 64 is slidably connected to the membrane filter bag layer 65 through the sliding block 617. The filter bag surface is covered with a PTFE film, with a filtration accuracy of ≤1μm and a fine dust interception rate of ≥99.9%. The cooperation between the sliding block 617 and the limiting slider 64 facilitates the disassembly and replacement of the membrane filter bag layer 65, reducing maintenance difficulty. The inner walls of the secondary dust collector 6 are fixed with sliding rods 67 between the limiting sliders 64. The outer walls of the sliding rods 67 are slidably connected to the sliding sleeves 68. An extension rod 69 is fixed on one side of the sliding sleeves 68. Air pipes 610 are fixed between the two sets of extension rods 69 to form a movable dust removal air pipe support. An air pump 611 is set on one side of the outer wall of the extension rods 69. The input end of the air pump 611 is connected to the pump box 66, and the output end is connected to the airflow flushing pipe 614 through the air pump transmission pipe 612 and the guide port 613. Multiple air ports 615 are opened at the bottom of the airflow flushing pipe 614, and the air ports 615 are connected to the transverse airflow flushing pipes 616 to form a multi-directional airflow flushing structure. During cleaning, the air pump 611 drives the airflow through the air port 615 and the transverse airflow flushing pipe 616 to spray high-pressure airflow onto the membrane filter bag layer 65. At the same time, the sliding sleeve 68 moves along the slide rod 67 to achieve comprehensive cleaning of the membrane filter bag layer 65, ensuring that the filter bag maintains a high-efficiency filtration state for a long time.

[0046] A control and transmission mechanism is provided on the rear side of the purification ash silo 1, located on the side of the primary filtration mechanism. The control and transmission mechanism includes a fixed frame 5 located on one side of the purification ash silo 1. An air inlet hopper 4 is fixedly connected to one side of the top of the fixed frame 5, and a nitrogen compressor 51 is provided at the end of the fixed frame 5 away from the air inlet hopper 4. A nitrogen transmission pipe 53 is fixedly connected to the output end of the nitrogen compressor 51, and the input end of the nitrogen compressor 51 is connected to the secondary dust removal box 6. A control box 52 is fixedly connected to the top of the fixed frame 5, located on the side of the nitrogen compressor 51. A nitrogen compressor 54 is provided on one side of the outer wall of the fixed frame 5. The input end of the nitrogen compressor 54 is connected to the purification ash silo 1, and the nitrogen compressor 54 is connected to the air inlet 3 through a transmission pipe 55. A display screen 2 is provided on the front side of the purification ash silo 1, and the display screen 2 is electrically connected to the control box 52.

[0047] The beneficial effect of adopting the above-mentioned further scheme is that the fixed frame 5 of the control transmission mechanism is set on one side of the rear end face of the purification ash silo 1, using a steel structure support, with the air inlet hopper 4 fixed on one side of the top, providing support for the primary filtration mechanism. A nitrogen compressor 51 is set at the end of the fixed frame 5 away from the air inlet hopper 4. Its input end is connected to the clean air outlet pipe 61 of the secondary dust removal box 6, and its output end compresses and stores the deeply purified nitrogen into the purification ash silo through the nitrogen transmission pipe 53 for power stone furnace recycling. A nitrogen compressor 54 is set on one side of the outer wall of the fixed frame 5. Its input end is connected to the purification ash silo 1 and is used to extract the residual nitrogen in the purification ash silo. It is then transported to the air inlet hopper 4 through the transmission pipe 55 and the air inlet 3 to realize the secondary recovery of nitrogen and improve the recovery rate. The top of the fixed frame 5 is fixedly connected to the control box 52 on one side of the nitrogen compressor 51. It has a built-in PLC controller and is electrically connected to the air pump 611, nitrogen compressor 51, nitrogen compressor 54 and various sensors to realize the automated control of the entire process of filtration, dust removal, compression and transmission. The front end of the purification ash silo 1 is equipped with a display screen 2, which is electrically connected to the control box 52. It displays parameters such as nitrogen purity, pressure, and filter bag pressure difference in real time, so that operators can monitor the system operation status and deal with abnormal situations in a timely manner.

[0048] The working principle of this invention: After the calcium carbide furnace is used, the calcium lime is transported by nitrogen. The resulting dust-laden nitrogen gas is first drawn by nitrogen compressor 54 and transported through transmission pipe 55 and air inlet 3 to air inlet 4, entering the air inlet 4 of the primary filtration mechanism. It then passes through the first filter screen 42, the second filter screen 44, and the third filter screen 45 for graded filtration, removing coarse particles and dust of different sizes. The nitrogen gas after primary filtration enters the dust collection box 46 on the top of the silo, where it is further filtered by filter bags 48 to remove fine dust particles with a diameter ≤5μm. The purified nitrogen gas is then transported to the secondary dust collection mechanism through air inlet 49, top air guide seat 416, and primary filtration air pipe 417. During this process, control box 52 periodically controls the high-pressure air source to spray air into the filter bags 48 through air jet 415 to clean the dust. The shaken dust falls into air inlet 4 and can be cleaned periodically through cleaning port 43. The preliminarily purified nitrogen gas then enters the secondary dust collection box 6 through primary filtration air inlet pipe 63 and top air inlet 62. The nitrogen passes through the membrane filter bag layer 65, where the PTFE film on the surface of the filter bag traps ultrafine dust particles with a diameter ≤1μm. The nitrogen gas, after deep purification, has a purity ≥99.5% and enters the control and transmission mechanism through the clean gas outlet pipe 61. When the pressure difference of the membrane filter bag layer 65 reaches a set threshold, such as 1.5-2kPa, the control box 52 starts the air pump 611. Compressed air is sprayed through the airflow flushing pipe 614 and the air port 615. At the same time, the sliding sleeve 68 moves along the slide rod 67 to achieve comprehensive dust removal. The dust after dust removal falls to the bottom of the secondary dust removal box 6. The nitrogen gas after deep purification is drawn in by the nitrogen compressor 51 and compressed to 0.8-1.2MPa. It is then transmitted back to the purified ash silo 1 through the nitrogen transmission pipe 53. The control box 52 receives signals from various sensors in real time and automatically adjusts parameters such as the dust removal cycle and compressor speed to ensure stable system operation. The display screen 2 displays the operating data in real time, and the operator can monitor or manually intervene in the system process through the display screen.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nitrogen recovery system for a calcium carbide furnace, comprising a purified ash silo (1) and a primary filtration mechanism disposed on one side of the purified ash silo (1), characterized in that, The primary filtration structure includes an air intake hopper (4) located on one side of the purification ash silo (1). A cleaning port (43) is provided on one side of the outer wall of the air intake hopper (4). The inner wall of the air intake hopper (4) is sequentially secured with a first filter screen (42), a second filter screen (44), and a third filter screen (45) by multiple clips (41). The mesh diameters of the first filter screen (42), the second filter screen (44), and the third filter screen (45) are all different. A dust collector box (46) is fixedly connected to the top of the air intake hopper (4). The inner wall of the dust collector box (46) is provided with an air jet filtration structure. A secondary dust filtration mechanism is provided on the other side of the outer wall of the purification ash silo (1); The rear end face of the purification ash silo (1) is provided with a control transmission mechanism on the side of the primary filtration mechanism.

2. The nitrogen recovery system for a calcium carbide furnace according to claim 1, characterized in that, The jet filtration structure includes multiple partitions (47) on the inner wall of the dust collector box (46) at the top of the bin. Filter bags (48) are arranged between multiple spaces divided by the partitions (47) on the inner wall of the dust collector box (46). Air inlets (49) are fixedly connected to the top of each filter bag (48). The tops of the multiple air inlets (49) are embedded in the tabletop (410), which is located at the top of the inner wall of the dust collector box (46).

3. The nitrogen recovery system for a calcium carbide furnace according to claim 2, characterized in that, The top of the dust collector box (46) is fixedly connected to a fixed base (411). A plurality of transmission air ports (413) are fixedly connected to one side of the outer wall of the fixed base (411). A transfer port (412) is fixedly connected to the bottom of the plurality of transmission air ports (413). A transmission pipe (414) is fixedly connected to one end of the plurality of transmission air ports (413). The fixed base (411) passes through the outer wall of the plurality of transmission pipes (414). An air jet port (415) is fixedly connected to the bottom of the plurality of transmission pipes (414). The plurality of air jet ports (415) are all corresponding to the air guide port (49).

4. A nitrogen recovery system for a calcium carbide furnace according to claim 3, characterized in that, The top end of the fixed base (411) is fixedly connected to the top air guide seat (416), and the top end of the top air guide seat (416) is fixedly connected to the pre-filter air guide tube (417).

5. A nitrogen recovery system for a calcium carbide furnace according to claim 1, characterized in that, The secondary dust filtration mechanism includes a secondary dust removal box (6) located on one side of the purification ash silo (1). A clean air outlet pipe (61) is fixedly connected to one side of the outer wall of the secondary dust removal box (6), and a top air inlet (62) is fixedly connected to the top of the secondary dust removal box (6). A primary filter air inlet pipe (63) is fixedly connected to the top of the top air inlet (62).

6. A nitrogen recovery system for a calcium carbide furnace according to claim 5, characterized in that, The inner walls of the secondary dust collector (6) are fixedly connected to both sides of the limiting sliders (64). The inner walls of the multiple limiting sliders (64) are slidably connected to the membrane filter bag layer (65) through the sliding block (617). The inner walls of the secondary dust collector (6) are fixedly connected to the sliding rods (67) between the multiple limiting sliders (64). The outer walls of the multiple sliding rods (67) are slidably connected to the sliding sleeves (68). One side of the multiple sliding sleeves (68) is fixedly connected to the extension rod (69). The multiple extension rods (69) are in pairs, and each pair of extension rods (69) is fixedly connected to the air pipe (610).

7. A nitrogen recovery system for a calcium carbide furnace according to claim 6, characterized in that, An air pump (611) is provided on one side of the outer wall of each of the multiple extension rods (69). The input end of the air pump (611) is connected to the pump box (66), and the output end of the air pump (611) is fixedly connected to an air pump transmission pipe (612). The end of the air pump transmission pipe (612) away from the air pump (611) is fixedly connected to an airflow flushing pipe (614) through a guide port (613). Each of the multiple airflow flushing pipes (614) has an air port (615) at its bottom end, and the bottom ends of the multiple airflow flushing pipes (614) are connected to a transverse airflow flushing pipe (616) between the multiple air ports (615).

8. A nitrogen recovery system for a calcium carbide furnace according to claim 1, characterized in that, The control and transmission mechanism includes a fixed frame (5) located on one side of the clean ash silo (1). An air inlet hopper (4) is fixedly connected to one side of the top of the fixed frame (5). A nitrogen compressor (51) is provided at the end of the fixed frame (5) away from the air inlet hopper (4). A nitrogen transmission pipe (53) is fixedly connected to the output end of the nitrogen compressor (51). The input end of the nitrogen compressor (51) is connected to the secondary dust removal box (6). A control box (52) is fixedly connected to the top of the fixed frame (5) on one side of the nitrogen compressor (51). A nitrogen compressor (54) is provided on one side of the outer wall of the fixed frame (5). The input end of the nitrogen compressor (54) is connected to the clean ash silo (1). The nitrogen compressor (54) is connected to the air inlet (3) through a transmission pipe (55).

9. A nitrogen recovery system for a calcium carbide furnace according to claim 1, characterized in that, The front end of the purification ash silo (1) is provided with a display screen (2), which is electrically connected to the control box (52).

Images