A high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas

Abstract

The present invention discloses a high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas, comprising a yellow phosphorus furnace gas inlet main pipe, a yellow phosphorus furnace gas outlet main pipe, an inlet branch pipe, an outlet branch pipe and a dust removal and filtering device, wherein a filter bin is horizontally provided in the middle of the dust removal and filtering device, a filter material for filtering dust is laid on the bottom plate, the yellow phosphorus furnace gas inlet main pipe is connected to a gas inlet gas collecting bin via an inlet branch pipe, and the gas outlet gas collecting bin is connected to the yellow phosphorus furnace gas outlet main pipe via an outlet branch pipe. Compared with the prior art, the present invention improves the existing yellow phosphorus preparation process, can effectively remove dust in the yellow phosphorus furnace gas, and the dust-removed yellow phosphorus furnace gas can enter a step to directly recycle clean yellow phosphorus, changing the traditional spray collection of yellow phosphorus while the dust is synchronously collected into the yellow phosphorus, increasing the yellow phosphorus refining and slag removal, causing yellow phosphorus loss while increasing the mud phosphorus and sewage output, can achieve non-stop cleaning and maintenance, greatly reducing the start-up and shutdown costs, and improving the safety of the equipment.

Description

Technical Field

[0001] The invention relates to the field of yellow phosphorus preparation, in particular to a high-temperature dust removal filter for furnace gas at an outlet of a yellow phosphorus electric furnace. Background Art

[0002] P4 yellow phosphorus (white phosphorus) is a white or light yellow translucent solid, elemental phosphorus (different from red phosphorus). The current yellow phosphorus production process involves adding phosphate rock, coke, and silica to a yellow phosphorus electric furnace in a proportional reaction. The furnace gases are then sprayed with water in a spray tower to cool the resulting crude phosphorus. This crude phosphorus is then introduced into a refining tank for a two-stage refining process to produce the final yellow phosphorus product.

[0003] The furnace gas produced by the yellow phosphorus electric furnace mainly contains P4 vapor, dust, CO, CH4, HCl, H2S, H3P and other gases. CO, CH4, HCl, H2S, and H3P are harmful gases and cannot be discharged. The yellow phosphorus in the P4 vapor condenses into a solid below 44.1°C, becomes a liquid between 44.1°C and 280°C, and becomes a gas above 280°C. Due to these physical properties of yellow phosphorus, the only current method for recovering yellow phosphorus furnace gas is direct wet treatment using water spraying. This involves using a spray tower for spray cooling to recover the yellow phosphorus. Since the furnace gas also contains a large amount of dust, the dust is also sprayed and washed out of the furnace gas during the water spraying to recover the yellow phosphorus in the spray tower. As a result, the crude phosphorus obtained by spraying contains a large amount of dust. At the same time, some of the dust stratifies with the water and enters the circulating cooling water, forming a large amount of sludge phosphorus, which is very difficult to handle later. Because the crude phosphorus recovered by spraying contains a large amount of dust, it must enter a refining system. Taking advantage of the density difference between yellow phosphorus and dust, repeated screening and rinsing processes are required to separate the dust and obtain high-quality yellow phosphorus products. Since the HCl and H2S in the furnace gas dissolve in large quantities in water, the recycled water from the spraying recovery becomes acidic, requiring the addition of alkali to neutralize and adjust its pH to 8-10. When the alkaline water is used to wash and cool the furnace gas, the alkali in the water reacts with the yellow phosphorus in the furnace gas to produce H3P, resulting in yellow phosphorus loss and an increase in the H3P concentration in the exhaust gas.

[0004] While current yellow phosphorus production typically involves wet recovery through direct water spraying, some have attempted dry separation methods to separate dust. Some have used cyclones in thermal power plants for dust collection, but cyclones have low separation efficiency and are unable to recover fine dust. Thermal power plants use bag filters for fine dust recovery, but these bags can withstand temperatures up to 150°C. Power plants can use bag filters because they remove dust from their exhaust gases, which are cooled by heat exchange in economizers to utilize waste heat. Therefore, their operating temperatures are below 150°C. However, the furnace gas from yellow phosphorus electric furnaces requires the vaporization of yellow phosphorus vapor, resulting in high-temperature steam temperatures of 280°C to 300°C, making it impossible to use bag filters to filter fine dust. Others have attempted to filter dust using microporous metal membranes. However, the P4 vapor easily condenses, blocking the micropores and making subsequent cleaning of the metal membranes difficult. These membranes are often unusable after a few days, making this approach ineffective.

[0005] Because yellow phosphorus production lines often require high downtime, and yellow phosphorus furnace gas contains over 85% CO, stopping to replace filter equipment can easily lead to poisoning, fire, and explosions, creating a high risk of serious consequences. Being able to clean and replace filter equipment during production would significantly improve economic efficiency and safety. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas that solves the above-mentioned problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-temperature dust removal filter for the furnace gas at the outlet of a yellow phosphorus electric furnace, comprising a yellow phosphorus furnace gas inlet main pipe, a yellow phosphorus furnace gas outlet main pipe, an air inlet branch pipe, an air outlet branch pipe and a dust removal and filtering device, a filter bin is horizontally provided in the middle of the dust removal and filtering device, the bottom surface of the filter bin is provided with a bottom plate, the bottom plate is made of a porous plate, and a filter material for filtering dust is laid on the bottom plate, the filter bin separates the dust removal and filtering device into a gas inlet gas collecting bin and a gas outlet gas collecting bin, the gas inlet gas collecting bin is located below the filter bin, and the gas outlet gas collecting bin is located above the filter bin, the yellow phosphorus furnace gas inlet main pipe is connected to the gas inlet gas collecting bin through the air inlet branch pipe, and the gas outlet gas collecting bin is connected to the yellow phosphorus furnace gas outlet main pipe through the air outlet branch pipe.

[0008] Preferably, the yellow phosphorus furnace gas inlet main pipe and the yellow phosphorus furnace gas outlet main pipe are erected above the dust removal and filtering device, the air inlet branch pipe is vertically arranged between the dust removal and filtering device and the yellow phosphorus furnace gas inlet main pipe, the air outlet branch pipe is vertically arranged between the dust removal and filtering device and the yellow phosphorus furnace gas outlet main pipe, a heating steam cleaning liquid inlet is provided at the top of the air outlet branch pipe, a heating steam outlet is provided at the top of the air inlet branch pipe, and a cleaning liquid outlet is provided at the middle and lower part of the air inlet branch pipe.

[0009] Preferably, the cleaning liquid outlet is opened at a position higher than the level of the filter material and lower than the top of the filter chamber.

[0010] Preferably, a drain valve is provided at the bottom of the gas inlet gas collecting bin.

[0011] Preferably, the filter bin is provided with a sand turning mechanism, which consists of a turning plow, a turning plow bracket and a driving device for driving the turning plow bracket to move forward and backward. There are two groups of turning plows, each group of turning plows is evenly spaced along the length of the filter bin, and the two groups of turning plows are staggered. The turning plows are all fixed on the turning plow bracket, and scrapers are horizontally provided on the front and rear sides of the turning plow bracket, and the turning plow is located between the scrapers.

[0012] Preferably, the plow is composed of two parts, a front plow harrow and a rear plow harrow, both of which are in the shape of a triangular pyramid, the bottom surface of the plow is a flat surface, and the front and rear ends of the plow are cone-shaped.

[0013] Preferably, the driving device consists of a driving power source and a driving rod, the driving power source is connected to the plow bracket through the driving rod, a guide rod is horizontally arranged in the filter bin to facilitate the forward and backward movement of the plow bracket, and the plow bracket is slidably connected to the guide rod.

[0014] Preferably, there are several dust removal and filtering devices, each of which is provided with an independent air inlet branch pipe and air outlet branch pipe, and is connected to the yellow phosphorus furnace gas inlet main pipe and the yellow phosphorus furnace gas outlet main pipe through the air inlet branch pipe and the air outlet branch pipe.

[0015] Preferably, both the air inlet pipe and the air outlet pipe are provided with switch valves.

[0016] Preferably, the filter chamber of the dust removal and filtering device is square.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) The dust removal filter of the present invention can bring about a fundamental change to the yellow phosphorus recovery process in the existing yellow phosphorus electric furnace gas. After the furnace gas comes out of the yellow phosphorus electric furnace, it enters the yellow phosphorus furnace gas inlet main pipe, and enters the dust removal filter device from the air inlet branch pipe for high-temperature dust filtration. The dust in the furnace gas can be filtered out by the laid filter material. The filtered furnace gas is collected from the air outlet branch pipe to the yellow phosphorus furnace gas outlet main pipe, which can effectively remove the dust in the yellow phosphorus furnace gas. The dust-free furnace gas can be directly condensed and recovered for yellow phosphorus. The condensation process can adopt heat exchange condensation by heat exchange pipe, and no sewage is generated. In addition, the recovered yellow phosphorus is dust-free and no longer needs to be refined, which can effectively reduce the subsequent equipment investment.

[0019] (2) The dust removal filter of the present invention is applicable to yellow phosphorus production of 10,000 tons or more. If the production line increases its output, it is only necessary to add dust removal and filtering devices to the phosphorus furnace gas inlet manifold and the yellow phosphorus furnace gas outlet manifold. The upgrade cost is low, the upgrade is very convenient, and it is suitable for popularization and application.

[0020] (3) The dust removal and filtering device of the present invention can clean the dust deposited inside the yellow phosphorus production system without affecting the operation of the system, thereby greatly reducing the start-up and shutdown costs of the yellow phosphorus production system, avoiding CO leakage and oxygen ingress in the equipment, and improving the safety and reliability of the equipment.

[0021] (4) When a dust removal and filtration device fails, only the single device needs to be shut down and switched, which will not affect the normal operation of the system. Steam purge is performed before maintenance to exhaust CO, which improves the safety factor during equipment maintenance.

[0022] (5) In order to ensure that the filter material can be fully cleaned during cleaning, a sand turning mechanism is specially designed in the dust removal and filtering device to realize the sand turning operation of the filter material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 A top view of the present invention;

[0025] Figure 3 is a side view of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the sand-casting mechanism of the present invention;

[0027] Figure 5 It is a top view of the sand-casting mechanism of the present invention;

[0028] Figure 6 It is a side view of the sand-casting mechanism of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the plow of the present invention.

[0030] In the figure, 1 is the yellow phosphorus furnace gas inlet main pipe; 2 is the yellow phosphorus furnace gas outlet main pipe; 3 is the air inlet branch pipe; 4 is the air outlet branch pipe; 5 is the dust removal and filtering device; 51 is the gas inlet collecting bin; 52 is the filter bin; 53 is the gas outlet collecting bin; 54 is the bottom plate; 55 is the filter material; 6 is the heating steam cleaning liquid inlet; 7 is the heating steam outlet; 8 is the cleaning liquid outlet; 9 is the drain valve; 10 is the switch valve; 11 is the plow rake; 110 is the rear plow rake; 111 is the front plow rake; 12 is the plowing bracket; 121 is the main bracket; 122 is the driving bracket; 123 is the guide bracket; 124 is the connecting bracket; 13 is the scraper; 14 is the driving power source; 15 is the driving rod; 16 is the guide rod. DETAILED DESCRIPTION

[0031] The present invention will be further described below. A high temperature dust removal filter for yellow phosphorus electric furnace outlet gas, see Figures 1 to 7, including a yellow phosphorus furnace gas inlet main pipe 1, a yellow phosphorus furnace gas outlet main pipe 2, an air inlet branch pipe 3, an air outlet branch pipe 4 and a dust removal filter device 5, a filter bin 52 is horizontally provided in the middle of the dust removal filter device 5, and a bottom plate 54 is provided on the bottom surface of the filter bin 52. The bottom plate 54 adopts a porous plate. The porous plate can adopt a metal plate with air holes of small apertures. A filter material 55 for filtering dust is laid on the bottom plate 54. Even fine dust can be filtered through the filter material 55. The filter material 55 can adopt a filter material such as quartz sand 55. The diameter of the filter material 55 needs to be larger than the air holes on the porous plate. Diameter, if the filter material 55 uses a particularly fine filter material 55, to prevent the filter material 55 from leaking from the porous plate, a layer of filter mesh can be laid on the porous plate first, and then the filter material 55 can be laid. The filter bin 52 separates the dust removal filter device 5 into a gas inlet gas collecting bin 51 and a gas outlet gas collecting bin 53. The gas inlet gas collecting bin 51 is located below the filter bin 52, and the gas outlet gas collecting bin 53 is located above the filter bin 52. The yellow phosphorus furnace gas inlet main pipe 1 is connected to the gas inlet gas collecting bin 51 through the gas inlet branch pipe 3, and the gas outlet gas collecting bin 53 is connected to the yellow phosphorus furnace gas outlet main pipe 2 through the gas outlet branch pipe 4. The design of the dust removal and filtering device 5 of the present invention can improve the yellow phosphorus production process. After exiting the yellow phosphorus furnace, the furnace gas enters the yellow phosphorus furnace gas inlet manifold 1, and then enters the dust removal and filtering device 5 from the air inlet branch pipe 3 for dust filtration. Fine dust in the furnace gas is filtered out by the installed filter material 55. The filtered furnace gas is then collected from the air outlet branch pipe 4 to the yellow phosphorus furnace gas outlet manifold 2. The dust-free yellow phosphorus furnace gas can be condensed and recovered through a heat exchanger, eliminating the need for recycling through a spray tower. The operating temperature of the entire dust removal and filtering device 5 and the yellow phosphorus furnace gas inlet manifold 1 and outlet manifold 2 must be maintained above 280°C to keep the yellow phosphorus in the yellow phosphorus furnace gas in vapor form and prevent condensation of the yellow phosphorus vapor. Because the filter material 55 is used for filtration, it is not affected by high temperature environments. The yellow phosphorus furnace gas with dust removed can enter a step to directly recover clean yellow phosphorus, changing the traditional spray collection of yellow phosphorus while the dust is collected into the yellow phosphorus at the same time, increasing the yellow phosphorus refining and slag removal, causing yellow phosphorus loss while increasing mud phosphorus and sewage production.

[0032] Since the design of the openings in the bottom plate 54 of the filter bin 52 will lead to a decrease in the flow rate of the furnace gas, the dust removal and filtering device 5 is designed to be a square structure, so as to increase the flow rate of the furnace gas on the bottom plate 54 of the filter bin 52, and the square structure facilitates the stacking and placement of the dust removal and filtering device 5. The structure of the gas inlet collecting bin 51 and the gas outlet collecting bin 53 in the dust removal and filtering device 5 of the present invention can form a circulation buffer space for the furnace gas, and some larger dust or slag can also be deposited at the bottom of the gas inlet collecting bin 51. After the yellow phosphorus furnace gas enters the dust removal and filtering device 5 from the air inlet branch pipe 3, it first enters the gas inlet collecting bin 51 for buffering, and then enters the gas outlet collecting bin 53 after being filtered by the filter bin 52 and discharged from the air outlet branch pipe 4. The dust removal and filtering device 5 of the present invention is formed by stacking multiple devices, the specific number of which is determined according to production. By running multiple dust removal and filtering devices 5 at the same time, the circulation needs of the yellow phosphorus furnace gas can be met. If the production line needs to increase its output, it is only necessary to add a set of air inlet branch pipes 3, air outlet branch pipes 4 and dust removal and filtering devices 5 to the air inlet main pipe and the yellow phosphorus furnace gas outlet main pipe 2. This is very convenient and can be applied to yellow phosphorus production lines of 10,000 tons or higher tonnage.

[0033] Although the method of using filter material 55 to filter dust can effectively filter the dust in the furnace gas, the existing problems are also obvious. Dust is deposited on the filter material 55, which is very inconvenient to clean and needs to be taken out for cleaning. Although the operating temperature of the system is above 280°, sometimes when the system is started and stopped to heat up or cool down, a small amount of P4 yellow phosphorus vapor will still condense on the filter material 55. In addition, there is more than 80% CO in the furnace gas. CO is a harmful gas that cannot be discharged. If the equipment is opened for cleaning, it is easy to cause risks such as explosion. Therefore, cleaning the dust is also a major problem. Therefore, the present invention establishes a set of cleaning system based on its structure. The yellow phosphorus furnace gas inlet main pipe 1 and the yellow phosphorus furnace gas outlet main pipe 2 are installed above the dust removal and filtering device 5. The air inlet branch pipe 3 is vertically arranged between the dust removal and filtering device 5 and the yellow phosphorus furnace gas inlet main pipe 1. The air outlet branch pipe 4 is vertically arranged between the dust removal and filtering device 5 and the yellow phosphorus furnace gas outlet main pipe 2. A heating steam cleaning liquid inlet 6 is opened at the top of the air outlet branch pipe 4, a heating steam outlet 7 is opened at the top of the air inlet branch pipe 3, and a cleaning liquid outlet 8 is opened in the middle and lower part of the air inlet branch pipe 3. The heating steam cleaning liquid inlet 6 is both an inlet for heating steam and an inlet for cleaning liquid. During cleaning, the air inlet branch pipe 3 is closed, and a cleaning liquid such as normal temperature clean water is added from the heating steam cleaning liquid inlet 6. The filter material 55 in the filter chamber 52 is cleaned in reverse, so that the dust flows to the bottom of the dust removal and filtering device 5. A large amount of dust and impurities are discharged through the cleaning liquid outlet 8, so as to achieve the effect of cleaning the filter material 55.

[0034] The opening position of the cleaning liquid outlet 8 is higher than the horizontal height of the filter material 55 and lower than the top of the filter chamber 52, which can ensure that the water level in the filter chamber 52 during cleaning can cover the filter material 55, and can enable the filter material 55 to be repeatedly cleaned in water. Heavier dust or slag is deposited at the bottom of the gas inlet gas collecting chamber 51. The bottom of the gas inlet gas collecting chamber 51 is provided with a drain valve 9, through which the heavier dust or slag can be discharged. After the cleaning is completed, high-temperature steam above 280° is added from the heating steam cleaning liquid inlet 6 to evaporate the water generated by the cleaning and blow it out from the heating steam outlet 7. Then, the dust removal filter device 5 and the air inlet branch pipe 3 and the air outlet branch pipe 4 are preheated to above 280° to avoid condensation of yellow phosphorus in the device. After reaching the corresponding temperature, it can be put into production and use again. The entire process from cleaning to restarting does not require disassembly of the equipment, and does not affect the normal operation of the equipment. The cleaning process does not need to be exposed to the air, and there will be no spontaneous combustion of yellow phosphorus. The operation is very convenient and quick. Since the boiler requirements for high-temperature steam above 280° are relatively high, the high-temperature and high-pressure steam of the power plant can reach this level. However, in actual use, high-temperature steam at 150° can also be used for preheating from an economical perspective. After the furnace gas enters, it will be heated to 280°, and even if there is a small amount of condensation, it can quickly become P4 steam. Before performing the cleaning operation, since there is still 280-300° of high-temperature furnace gas in the dust removal and filter device 5, if washing water is directly introduced, the washing water will immediately gasify, causing the equipment pressure to be excessively increased. Therefore, it is necessary to cool the dust removal and filter device 5, and pass normal temperature air from the heating steam outlet 7. Alternatively, the low-temperature tail gas after heat exchange condensation can be used for cooling. If it is necessary to start the machine for maintenance, steam needs to be introduced from the heating steam outlet 7 in advance, and the harmful gases such as CO in the dust removal filter need to be discharged before starting the machine for maintenance. By means of the above structural design, the dust removal filter can fully meet the needs of yellow phosphorus production.

[0035] Since some dust is difficult to be thoroughly cleaned out in the filter material 55, and a small amount of yellow phosphorus will condense, the present invention has specially designed a sand turning mechanism so that the filter material 55 can be thoroughly cleaned during the cleaning process. At the same time, it is also necessary to ensure that the filter material 55 has a uniform thickness and a smooth surface after sand turning. The filter chamber 52 is provided with a sand turning mechanism, which is composed of a turning plow, a turning plow bracket 12 and a driving device for driving the turning plow bracket 12 to move back and forth. There are two groups of turning plows, each group of turning plows is evenly spaced along the length of the filter chamber 52, and the two groups of turning plows are staggered. The turning plows separate the filter material 55 from both sides of each turning plow during the back and forth motion. This achieves the sand-turning effect. The two sets of staggered plows can ensure that there is space for the filter material 55 to be turned over, and the turning range is wider and fuller, and the turning is more uniform. The plows are all fixed on the plow bracket 12. Scrapers 13 are horizontally provided on the front and rear sides of the plow bracket 12. The scrapers 13 are tilted. The plow is located between the scrapers 13. The scrapers 13 provided on both sides can flatten the filter material 55 after the plow is turned over when the plow bracket 12 moves back and forth, so that the plow can turn over again to ensure that the filter material 55 is fully turned over so that the dust on the filter material 55 is fully cleaned. When the cleaning water is discharged, the filter material 55 is evenly distributed and the surface is flat.

[0036] The plow is composed of two parts: a front plow rake 11111 and a rear plow rake 11011. Both the front plow rake 11111 and the rear plow rake 11011 are triangular pyramidal in shape. The bottom surface of the plow is flat, and the front and rear ends of the plow are tapered. This structural advantage includes the ability to effectively flip the filter material 55 during the plow's forward and backward movement, with low resistance during movement, making it easy to drive. The drive device is composed of a driving power source 14 and a driving rod 15. The driving power source 14 is connected to the plow bracket 12 through the driving rod 15. A guide rod 16 is horizontally mounted within the filter chamber 52 to facilitate the forward and backward movement of the plow bracket 12. The plow bracket 12 is slidably connected to the guide rod 16, and the guide rod 16 serves as a positioning guide during the plow's forward and backward movement. The plowing bracket 12 consists of a main bracket 121, a guide bracket 123, a drive bracket 122, and a connecting bracket 124. The drive bracket 122 and guide bracket 123 are vertically welded to the main bracket 121. The lower end of the drive bracket 122 is welded to the main bracket 121, and the upper end is transmission-connected to the plowing drive rod 15. There are two guide brackets 123, symmetrically arranged on the front and rear sides of the drive bracket 122. The lower end of each guide bracket 123 is welded to the main bracket 121, and the upper end is provided with a slider that matches the guide rod 16 and is slidingly connected to the guide rod 16 via the slider. Multiple connecting brackets 124 are welded to the main bracket 121, and each connecting bracket 124 is fixedly connected to the scraper 13 and the plowing bracket. In this way, the plowing bracket 12 is driven to move forward and backward to achieve the directional forward and backward movement of the plowing bracket 12. The driving device can be driven by a cylinder or a screw. If the cylinder is used, the driving power source 14 is a cylinder and the driving rod 15 is a piston rod. The front end of the driving rod 15 is fixedly connected to the upper end of the driving bracket 122 of the plow bracket 12. If the screw is used, the driving power source 14 is a screw motor that drives the screw to rotate, and the driving rod 15 is a screw. A screw sleeve that matches the screw is welded to the upper end of the driving bracket 122 of the plow bracket 12.

[0037] The present invention has several dust removal and filtering devices 5, each of which is equipped with an independent air inlet branch pipe 3 and air outlet branch pipe 4, and is connected to the yellow phosphorus furnace gas inlet main pipe 1 and the yellow phosphorus furnace gas outlet main pipe 2 through the air inlet branch pipe 3 and the air outlet branch pipe 4. The air inlet branch pipe 3 and the air outlet branch pipe 4 are both provided with a switch valve 10. Due to the large processing capacity of tens of thousands of tons of yellow phosphorus furnace gas, the present invention reduces the processing capacity of a single device through the independent air inlet branch pipe 3 and the air outlet branch pipe 4, which can reduce the floor space occupied by the dust removal and filtering device 5. Multiple dust removal and filtering devices 5 can also be stacked and placed, effectively reducing the floor space. The biggest feature is that multiple dust removal and filtering devices 5 can be operated simultaneously, and dust removal and filtering devices 5 can be added according to the increase in production volume, which provides more possibilities for future expansion of larger production volumes. At the same time, it provides corresponding conditions for non-stop cleaning. It is only necessary to prepare 1-2 more dust removal and filtering devices 5 as backup on the basis of the original furnace gas flow rate. When cleaning is needed, it is only necessary to fill the spare dust removal and filtering device 5 with heating steam and heat it to 280°, then open the switch valve 10 on the spare dust removal and filtering device 5, and close the switch valve 10 on the dust removal and filtering device 5 that needs to be cleaned, so as to carry out cleaning without disassembling the machine, which is very convenient.

[0038] The above is a detailed introduction to a high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. Changes and improvements to the present invention will be possible without exceeding the concept and scope specified in the appended claims. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas, characterized in that: It includes a yellow phosphorus furnace gas inlet main pipe, a yellow phosphorus furnace gas outlet main pipe, an air inlet branch pipe, an air outlet branch pipe and a dust removal and filtering device. A filter bin is horizontally provided in the middle of the dust removal and filtering device. The bottom surface of the filter bin is provided with a base plate. The base plate is made of a porous plate. Filter material for filtering dust is laid on the base plate. The filter bin separates the dust removal and filtering device into a gas inlet gas collecting bin and a gas outlet gas collecting bin. The gas inlet gas collecting bin is located below the filter bin, and the gas outlet gas collecting bin is located above the filter bin. The yellow phosphorus furnace gas inlet main pipe is connected with the gas inlet gas collecting bin through the air inlet branch pipe, and the gas outlet gas collecting bin is connected with the yellow phosphorus furnace gas outlet main pipe through the air outlet branch pipe. The yellow phosphorus furnace gas inlet main pipe and the yellow phosphorus furnace gas outlet main pipe are mounted above the dust removal and filtering device, and the air inlet branch pipe is vertically arranged above the dust removal and filtering device. Between the dust filtering device and the yellow phosphorus furnace gas inlet main pipe, the air outlet branch pipe is vertically arranged between the dust removal and filtering device and the yellow phosphorus furnace gas outlet main pipe, the top of the air outlet branch pipe is provided with a heating steam cleaning liquid inlet, the top of the air inlet branch pipe is provided with a heating steam outlet, and the lower middle part of the air inlet branch pipe is provided with a cleaning liquid outlet. The opening position of the cleaning liquid outlet is higher than the horizontal height of the filter material and lower than the top of the filter bin. The filter bin is provided with a sand turning mechanism, and the sand turning mechanism consists of a turning plow, a turning plow bracket and a driving device for driving the turning plow bracket to move forward and backward. There are two groups of turning plows, each group of turning plows is evenly spaced along the length of the filter bin, and the two groups of turning plows are staggered. The turning plows are all fixed on the turning plow bracket, and scrapers are horizontally provided on the front and rear sides of the turning plow bracket, and the turning plow is located between the scrapers.

2. A high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas according to claim 1, characterized in that: A drain valve is provided at the bottom of the gas inlet gas collecting bin.

3. The high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas according to claim 1, characterized in that: The plow is composed of a front plow harrow and a rear plow harrow. Both the front plow harrow and the rear plow harrow are in the shape of a triangular pyramid. The bottom surface of the plow is a flat surface, and the front and rear ends of the plow are cone tips.

4. The high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas according to claim 1, characterized in that: The driving device consists of a driving power source and a driving rod. The driving power source is connected to the plow bracket through the driving rod. A guide rod is horizontally arranged in the filter bin to facilitate the forward and backward movement of the plow bracket. The plow bracket is slidably connected to the guide rod.

5. The high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas according to claim 1, characterized in that: There are several dust removal and filtering devices, each of which is provided with an independent air inlet branch pipe and an air outlet branch pipe, and is connected to the yellow phosphorus furnace gas inlet main pipe and the yellow phosphorus furnace gas outlet main pipe through the air inlet branch pipe and the air outlet branch pipe.

6. A high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas according to claim 5, characterized in that: The air inlet branch pipe and the air outlet branch pipe are both provided with switch valves.

7. The high-temperature dust removal filter for yellow phosphorus electric furnace outlet gas according to claim 1, characterized in that: The filter chamber of the dust removal and filtering device is square.

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