Solid flow filter for dust filtration

Abstract

The utility model discloses a solid flow filter for dust filtration, a filter device is vertically arranged in the solid flow filter, the filter device consists of a plurality of groups of filter mechanisms which are horizontally arranged from top to bottom in sequence, each filter mechanism consists of two striker plates which are arranged in parallel, and the striker plates are arranged in parallel. The solid flow filter is provided with a filter material feeding pipe and a filter material discharging pipe, the filter material feeding pipe is located above the filter material flow channel, and the filter material discharging pipe is located below the filter material flow channel. Compared with the prior art, the filter device has the advantages that the flowing filter material is used as a medium, the filter material is stacked in the stacking gap of the filter device to form the filter layer, dust in yellow phosphorus furnace gas is filtered and collected through the filter layer, the filter material flows from top to bottom through the filter material flowing channel, and the filter material with dust is taken out of the solid flowing filter; dry type filtering of yellow phosphorus furnace gas is achieved, and system operation is simpler and more convenient.

Description

Technical Field

[0001] The utility model relates to the field of filtering device equipment, in particular to a solid flow filter for dust filtering. Background Art

[0002] P 4 Yellow phosphorus (white phosphorus), phosphorus element (different from red phosphorus), white or light yellow translucent solid. The current yellow phosphorus production process is to put phosphate rock, coke and silica raw materials into the yellow phosphorus electric furnace in proportion to react, then spray the furnace gas produced by the electric furnace with water in the spray tower to cool it, and then introduce the crude phosphorus into the refining tank for two-stage refining to finally obtain the yellow phosphorus product. 4 Yellow phosphorus is a chemical product with high energy consumption, high material consumption and high pollution. During the production process, a large number of toxic and harmful substances are produced, such as mud phosphorus and yellow phosphorus tail gas. The furnace gas produced by the yellow phosphorus electric furnace mainly contains P 4 Steam, dust, CO, CH 4 、HCL、H 2 S.H. 3 P and other gases, CO, CH 4 、HCL、H 2 S.H. 3 P is harmful gas that cannot be discharged. 4 Yellow phosphorus in the steam will condense into solid when the temperature is below 44.1°C, become liquid when the temperature is between 44.1°C and 280°, and become gas when the temperature is above 280°.

[0003] Due to the physical properties of yellow phosphorus, the only way to recover yellow phosphorus furnace gas at present is to use direct wet treatment of water spraying, that is, to use a spray tower to spray and cool and recover yellow phosphorus. Since the furnace gas also contains a large amount of dust, when the yellow phosphorus is recovered by water spraying in the spray tower, the dust is also sprayed and washed from the furnace gas, resulting in a large amount of dust in the crude phosphorus obtained by spraying. At the same time, part of the dust is stratified with water and enters the circulating cooling water to produce a large amount of sewage and mud phosphorus, which is very difficult to handle in the later stage. Since the crude phosphorus obtained by spraying and recycling contains a large amount of dust, it needs to enter the refining system, and the density difference between yellow phosphorus and dust is used to separate the dust by rinsing with water for many times, so as to obtain a refined yellow phosphorus product.

[0004] Other problems with the existing process include: 1. The spray tower needs to continuously spray the yellow phosphorus furnace gas directly, resulting in huge water consumption and high energy consumption. 2. The amount of sewage generated is large, and a large sewage treatment system and equipment are required, which requires a large capital investment and occupies a large area. 3. Sewage treatment is also difficult, because there is yellow phosphorus and dust in the sewage, and their combination will produce mud phosphorus. The treatment of mud phosphorus is a major problem in the yellow phosphorus production industry. 4. The yellow phosphorus furnace gas is a high-temperature furnace gas of 280-300° when entering the spray tower. After direct spray cooling, it forms tail gas of 50-80°, in which the heat energy is directly lost through the vaporization of spray water, and the heat energy is not recycled, which also causes an increase in water consumption.

[0005] Although the current yellow phosphorus preparation mostly adopts direct wet treatment by water spraying, some people try to use dry separation method to separate dust, and some use cyclone separators in thermal power plants for dust collection, but the separation efficiency of cyclone separators is very low, and fine dust cannot be recovered. Thermal power plants use bag filters to recover fine dust, but the bag can withstand a maximum temperature of 150°, and cannot directly filter dust from the 300° yellow phosphorus furnace gas. The reason why power plants can use bag filters is that the tail gas is first cooled by heat exchange in the economizer, and the tail gas is reduced to below 150° while the waste heat is utilized. The yellow phosphorus electric furnace requires the yellow phosphorus steam to be gasified, so the furnace gas is required to reach a high-temperature steam state of 280° to 300°. Below 150°, the yellow phosphorus will become liquid, which will affect the bag dust removal. Some people also try to use a metal membrane with micropores to filter dust, because P 4 Steam is easy to condense, resulting in clogging of micropores. The subsequent cleaning of the metal membrane is very troublesome and usually the membrane cannot be used after a few days, making this solution ineffective to implement.

[0006] In this regard, our company has developed a high-temperature dust removal and filtration device for yellow phosphorus furnace gas, which can solve the problem of filtering, separating and recovering dust and fine dust in yellow phosphorus furnace gas. For details, see patent number CN 2022110158444, a high-temperature dust removal filter for the outlet gas of a yellow phosphorus electric furnace. The dust removal filter of this technology can bring fundamental changes to the yellow phosphorus recovery process in the existing yellow phosphorus electric furnace gas. The yellow phosphorus furnace gas enters the dust removal and filtration device for high-temperature dust filtration. The dust in the furnace gas can be filtered out by the laid filter material, 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 use heat exchange tubes for heat exchange and condensation, which will not generate sewage. In addition, the recovered yellow phosphorus is dust-free and no longer requires refining treatment, which can effectively reduce the subsequent equipment investment.

[0007] However, this technology has several defects: 1. Since the furnace gas generated by the yellow phosphorus furnace is continuous, when one group of filter bins of the dust removal and filtering device is full of dust adsorption, it is necessary to switch to another group of dust filter bins and clean the filter materials in this group of filter bins at the same time. The switching process is relatively cumbersome. 2. In order to ensure that the filter material is fully flushed of dust during the backwashing process, a built-in sand turning mechanism is used to cooperate with backwashing to flush out the dust in the filter material, but the flipping process will inevitably cause small particles of filter material to leak out from the porous plate, reducing the filter material. 3. Before the filter bin is put into use, it is necessary to preheat the filter bin and heat it to above 280° by filling it with heating steam before it can be put into use to avoid the condensation of yellow phosphorus in the yellow phosphorus furnace gas in the filter bin. Therefore, it is urgent to design a more advantageous yellow phosphorus dust filtration device. Utility Model Content

[0008] The purpose of the utility model is to provide a solid flow filter for dust filtering which solves the above-mentioned problem.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a solid flow filter for dust filtering, an air inlet pipe is provided on the left side of the solid flow filter, an air outlet pipe is provided on the right side of the solid flow filter, a filtering device is vertically provided in the solid flow filter, and the filtering device is composed of a plurality of groups of horizontally arranged filtering mechanisms from top to bottom, the filtering mechanism is composed of two parallel baffle plates, and the lower ends of the two baffle plates are inclined inwardly to form a leakage port, a stacking gap is left between the filtering mechanisms, and a filter material flow channel is formed through the leakage port, a filter material feed pipe and a filter material discharge pipe are provided on the solid flow filter, the filter material feed pipe is located above the filter material flow channel, and the filter material discharge pipe is located below the filter material flow channel.

[0010] Preferably, the filter material feed pipe is provided with a filter material feeding pipe, the filter material feeding pipe is provided with a feeder, the filter material discharge pipe is provided with a filter material discharge pipe, the filter material discharge pipe is provided with a discharger, and the feeder and the discharger are sealed feeders and sealed dischargers.

[0011] Preferably, there are two or more filter devices, which are fixed side by side in the solid flow filter, and the baffle plates of adjacent filter devices are connected by welding.

[0012] Preferably, the filter material feed pipe and the filter material discharge pipe are both provided with branch pipes, and the number and position of the branch pipes correspond to those of the filtering device.

[0013] Preferably, the main body of the solid flow filter is a transversely arranged cylindrical structure.

[0014] Preferably, the baffle plate is in the shape of an elongated strip, and both ends of the baffle plate are respectively welded and fixed to the inner wall of the solid flow filter.

[0015] Preferably, the filter material in the filter device is made of corrosion-resistant and high-temperature-resistant inorganic uniform small-particle material such as quartz sand.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] (1) The utility model designs a solid flow filter with flowing filter material as the medium. The feeding and discharging speeds of the filter material are controlled by a feeder and a discharging machine, so that the filter material is accumulated in the stacking gap of the filter device to form a filter layer. The filter layer is used to filter and collect dust in the yellow phosphorus furnace gas. At the same time, the filter material flow channel is used to realize the flow of the filter material from top to bottom, so that the filter material with dust is brought out of the solid flow filter. The dust in the yellow phosphorus furnace gas is collected by the flow of the solid filter material.

[0018] (2) The utility model realizes dry filtration of yellow phosphorus furnace gas. Compared with the original high-temperature dust removal filter, the flow of filter material can not only realize the filtration of yellow phosphorus furnace gas, but also the old filter material containing dust can be continuously discharged during the continuous addition of new filter material, thus realizing the replacement of old and new filter materials. After the filtration system is started, the dust can be continuously filtered without switching and preheating the dust filtration bin pipeline, sanding the filter material and backwashing the dust, thus reducing the leakage points of the flammable, explosive and toxic gas control switching valve, making the system safer, simpler and more convenient to operate, and more conducive to the continuous production operation of the production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the filtering device in the solid flow filter of the utility model;

[0021] Figure 3 It is a top view of the filter device of the utility model;

[0022] Figure 4 The utility model is a system structure principle diagram for filtering yellow phosphorus furnace gas dust.

[0023] In the figure, 1. air inlet pipe; 2. solid flow filter; 21. filter device; 210. filter mechanism; 211. baffle plate; 212. leakage port; 213. stacking gap; 214. filter material flow channel; 22. filter material feed pipe; 23. filter material discharge pipe; 24. filter material; 3. air outlet pipe; 4. filter material discharge pipe; 5. discharge machine; 6. filter material feeding pipe; 7. feeder; 8. filter material cleaning chamber; 9. heated air inlet pipe; 10. exhaust gas exhaust pipe; 11. cyclone separator. DETAILED DESCRIPTION

[0024] The utility model will be further described below.

[0025] A solid flow filter for dust filtration, see Figures 1 to 3 An air inlet pipe 1 is provided on the left side of the solid flow filter 2, and an air outlet pipe 2 is provided on the right side of the solid flow filter. A filtering device 21 is vertically provided in the solid flow filter 2, and the filtering device 21 is composed of a plurality of groups of horizontally arranged filtering mechanisms 210 from top to bottom. A filter material feed pipe 22 and a filter material discharge pipe 23 are provided on the solid flow filter 2. The filter material feed pipe 22 is located above the filter material flow channel 214, and the filter material discharge pipe 23 is located below the filter material flow channel 214. The filter material 24 in the filtering device 21 is made of corrosion-resistant and high-temperature resistant inorganic uniform small particle materials such as quartz sand.

[0026] The filter mechanism 210 is composed of two parallel baffle plates 211, and the lower ends of the two baffle plates 211 are inclined inward to form a material leakage port 212. A filter material flow channel 214 is formed between the filter mechanisms 210 through the material leakage port 212. The baffle plates 211 are long strips, and the two ends of the baffle plates 211 are respectively welded and fixed to the inner wall of the solid flow filter 2. When the filter material feed pipe 22 is used to discharge the high-temperature filter material 24, the new filter material 24 is stacked on the upper part of the filter mechanism 210 to form a filter layer. At the same time, the filter material 24 stacked at the bottom of the filter mechanism 210 flows into the lower layer from the material leakage port 212 between the baffle plates 211, so that the filter material 24 flows from top to bottom. Finally, the filter material 24 carrying dust is discharged from the filter material feed pipe 22, so as to realize the replacement of the filter material 24.

[0027] The solid flow filter 2 designed by the utility model realizes that the flowing solid filter material 24 is used as the medium. Through the continuous feeding of the filter material 24, the filter material 24 is accumulated in the stacking gap 213 of the filter device 21 to form a filter layer, and the dust in the furnace gas is filtered and collected through the filter layer. At the same time, the filter material flow channel 214 is used to realize the flow of the filter material 24 from top to bottom, and the filter material 24 with dust is brought out of the solid flow filter 2, and the dust in the furnace gas is collected through the flow of the solid filter material 24. The feeding and discharging speeds of the filter material 24 can be controlled by the feeder 7 and the discharging machine 5, so that the filter material 24 can be accumulated in the filter device 21 and discharged by flow.

[0028] The utility model realizes dry filtration. Compared with the original high-temperature dust removal filter, the flow of the filter material 24 can not only realize the filtration of the furnace gas, but also the old filter material 24 containing dust is continuously discharged during the continuous addition of the new filter material 24, thereby realizing the replacement of the old and new filter materials 24. After the filtration system is started, the dust can be continuously filtered without switching and preheating the dust filter bin pipeline, sanding the filter material 24 and backwashing the dust. The system operation is simpler and more convenient, and is more conducive to the continuous production operation of the production preparation system.

[0029] The filter material feed pipe 22 is provided with a filter material feed pipe 6, the filter material feed pipe 6 is provided with a feeder 7, the filter material discharge pipe 23 is provided with a filter material discharge pipe 4, the filter material discharge pipe 4 is provided with a discharger 5, the filter material 24 is transported through the filter material feed pipe 6 and the filter material discharge pipe 4, the feeder 7 and the discharger 5 are used to control the feed and discharge speeds of the filter material 24, and the feeder 7 and the discharger 5 need to calculate and set the feed and discharge speeds according to the actual situation on site, so as to realize the accumulation and flow discharge of the filter material 24 in the filter device 21. The feeder 7 and the discharger 5 are sealed feeders and sealed dischargers to avoid leakage of yellow phosphorus furnace gas.

[0030] Due to different working conditions on site, when designing the solid flow filter 2, the filter device 21 needs to be adjusted and designed according to the working conditions on site. When the filtering effect of a single filter device 21 is not very satisfactory, multiple filter devices 21 can be added. The filter devices 21 have two or more groups and are fixed side by side in the solid flow filter 2. Multiple filter devices 21 in parallel can effectively improve the dust filtering and collection effect. In this embodiment, two groups of filter devices 21 are parallel to form a dual-channel filtering method as an example. When welding the baffle plate 211, the adjacent baffle plates 211 of the two groups of filter devices 21 can be welded to form a whole. The filter material feed pipe 22 and the filter material discharge pipe 23 are both provided with branch pipes. The number and position of the branch pipes correspond to the filter device 21. When the filter material 24 is discharged, two vertical filter layers will be formed to improve the dust filtering effect of the furnace gas. The main body of the solid flow filter 2 is a horizontally arranged cylindrical structure to facilitate the additional arrangement of the filter device 21.

[0031] The utility model can be used for dust removal of various high-temperature tail gases, especially for filtering dust in high-temperature yellow phosphorus furnace gas. The specific implementation scheme for filtering dust in yellow phosphorus furnace gas is as follows: a dust filtering system for yellow phosphorus furnace gas, such as Figure 4As shown, it includes a solid flow filter 2, a filter material cleaning bin 8, a filter material feeding pipe 6 and a filter material discharging pipe 4. A yellow phosphorus furnace gas inlet pipe is provided on the left side of the solid flow filter 2, and a yellow phosphorus furnace gas outlet pipe is provided on the right side of the solid flow filter 2. A filtering device 21 is vertically provided in the solid flow filter 2. The filtering device 21 is composed of a plurality of horizontally arranged filtering mechanisms 210 from top to bottom. The filtering mechanisms 210 are provided with filter material flow channels 214. Stacking gaps 213 are left between the filtering mechanisms 210. A filter material feeding pipe 22 and a filter material discharging pipe 23 are provided on the solid flow filter 2. The filter material feeding pipe 22 is located above the filter material flow channel 214, and the filter material discharging pipe 23 is located below the filter material flow channel 214. The filter material discharging pipe 23 is connected with the feed port of the filter material cleaning bin 8 through the filter material discharging pipe 4, and the discharge port of the filter material cleaning bin 8 is connected with the filter material feeding pipe 22 through the filter material feeding pipe 6.

[0032] The filter material 24 is cached and cleaned through the filter material cleaning bin 8, and is heated by heated air above 380°C, so that the temperature of the filter material 24 entering the solid flow filter 2 is above 280°C, ensuring that the yellow phosphorus is in a gaseous state and can pass through the filter material layer to enter the next stage for condensation and recycling. In order to achieve the caching and heating of the filter material 24 and the separation of dust, a filter material cleaning bin 8 is designed, and a heated air inlet pipe 9 and a cyclone separator 11 are designed in conjunction. Since dust is lighter than the filter material 24, a plurality of hot air inlets are provided at the bottom of the filter material cleaning bin 8. After the hot air is introduced, the dust can be blown up from the filter material 24 to achieve the separation of the dust and the filter material 24. The heated air inlet pipe 9 is respectively connected to each hot air inlet, and a heating device is provided at the air inlet end of the heated air inlet pipe 9. The heated high-temperature air can be blown into the filter material cleaning bin 8 by a blower to achieve the separation of the dust and the filter material 24, and the filter material 24 is heated at the same time. An exhaust gas exhaust pipe 10 is provided at the top of the filter material cleaning bin 8, and the exhaust gas exhaust pipe 10 is connected to the air inlet of the cyclone separator 11. The blown dust is discharged into the cyclone separator 11 together with the hot air for dust collection, and the hot air after separation can be introduced into the waste heat boiler for waste heat utilization.

[0033] A dust filtration process for yellow phosphorus furnace gas, the method steps are as follows:

[0034] First, the filter material flow circulation system, i.e., the feeder 7 and the discharger 5, is started, the filter material 24 is stacked between the filter mechanism 210 to form a filter layer, the filter material 24 flows out of the solid flow filter 2 in turn, passes through the discharger 5 and the filter material discharge pipe 4 into the filter material cleaning bin 8, and then passes through the filter material feeding pipe 5 and the feeder 7 and then enters the solid flow filter 2, and the cycle is repeated;

[0035] Secondly, the heated air inlet pipe 9 supplies high-temperature hot air from the hot air inlet at the bottom of the filter material cleaning chamber 8 to the filter material cleaning chamber to heat the filter material 24. The high-temperature air blows up the dust in the filter material 24 to separate the filter material 24 from the dust. While the filter material cleaning chamber 8 is separating the dust from the filter material 24, the filter material 24 is heated by the high-temperature air at 380°C. The reason for using heated air above 380°C for heating is to maintain the filter material 24 in the filter device 21 at above 280°C, to ensure that the yellow phosphorus in the solid flow filter 2 is in a gaseous state, so that the gaseous yellow phosphorus can enter the first stage with the furnace gas for condensation recovery of the yellow phosphorus;

[0036] Then, when the temperature of the filter material 24 in the filter material circulation system reaches 280°C to 300°C, the dust-containing furnace gas at nearly 200°C is supplied to the solid flow filter through the yellow phosphorus furnace gas inlet pipe 1, and the filter layer through which the yellow phosphorus furnace gas passes is subjected to dust filtration. After filtration, the clean furnace gas at nearly 280°C is discharged through the yellow phosphorus furnace gas outlet pipe 3; the filtered yellow phosphorus furnace gas is free of dust, and after being discharged from the yellow phosphorus furnace gas outlet pipe 3, the yellow phosphorus can be directly condensed and recovered through the recovery system; the recovery system can adopt the energy-saving, low-carbon and environmentally friendly yellow phosphorus preparation system and process CN2022110159080 developed by the company, and only the high-temperature dust removal and filtering device thereof needs to be replaced with the dust filtration system of the present invention;

[0037] Finally, the furnace gas dust filtered out by the solid flow filter 2 is brought into the filter material cleaning bin 8 for separation along with the flow of the filter material 24. The separated dust is taken away by the high-temperature hot air entering the filter material cleaning bin 8, and is discharged into the cyclone separator 11 through the exhaust pipe 10 to collect and remove the dust. After the hot air is discharged from the exhaust port of the cyclone separator 11, it can enter the waste heat boiler for waste heat recovery and utilization; the filter material 24 after absorbing heat enters the solid flow filter 2 again through the filter material feeding pipe 6 and the feeder 7 to enter the next cycle.

[0038] Since yellow phosphorus will spontaneously combust when the temperature is below 44.1°C, in order to avoid damage to maintenance personnel caused by shutdown, the intake of yellow phosphorus furnace gas and the heating of the heated air inlet pipe 9 should be stopped during shutdown for maintenance. At this time, the temperature in the filtration system will gradually decrease. When it is below 280°C, the yellow phosphorus vapor will condense on the surface of the filter material 24. The filter material 24 with residual yellow phosphorus will be transported to the filter material cleaning bin 8 through the discharging machine 5. The yellow phosphorus on the surface of the filter material 24 in the filter material cleaning bin 8 will spontaneously combust when it encounters air. At this time, the room temperature air input by the heated air inlet pipe 9 can increase oxygen for combustion. Maintenance work can be carried out after it is completely burned out.

[0039] The above is a detailed introduction to a solid flow filter for dust filtration provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope, and changes and improvements to the utility model will be possible without exceeding the concept and scope specified in the attached claims. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A solid flow filter for dust filtration, characterized in that: An air inlet pipe is provided on the left side of the solid flow filter, and an air outlet pipe is provided on the right side of the solid flow filter. A filtering device is vertically provided in the solid flow filter, and the filtering device is composed of a plurality of groups of horizontally arranged filtering mechanisms from top to bottom. The filtering mechanism is composed of two parallel baffle plates, and the lower ends of the two baffle plates are inclined inward to form a leakage port. A stacking gap is left between the filtering mechanisms, and a filter material flow channel is formed through the leakage port. A filter material feed pipe and a filter material discharge pipe are provided on the solid flow filter, and the filter material feed pipe is located above the filter material flow channel, and the filter material discharge pipe is located below the filter material flow channel.

2. A solid flow filter for dust filtration according to claim 1, characterized in that: The filter material feed pipe is provided with a filter material feeding pipeline, the filter material feeding pipeline is provided with a feeder, the filter material discharge pipe is provided with a filter material discharge pipeline, the filter material discharge pipeline is provided with a discharger, and the feeder and the discharger are sealed feeders and sealed dischargers.

3. A solid flow filter for dust filtration according to claim 1, characterized in that: The filter devices are provided in two or more groups and are fixed side by side in the solid flow filter, and the baffle plates of adjacent filter devices are connected by welding seams.

4. A solid flow filter for dust filtration according to claim 3, characterized in that: The filter material feed pipe and the filter material discharge pipe are both provided with branch pipes, and the number and position of the branch pipes correspond to the filtering device.

5. A solid flow filter for dust filtration according to claim 1, characterized in that: The main body of the solid flow filter is a transversely arranged cylindrical structure.

6. A solid flow filter for dust filtration according to claim 1, characterized in that: The baffle plate is in the shape of a long strip, and both ends of the baffle plate are respectively welded and fixed to the inner wall of the solid flow filter.

7. A solid flow filter for dust filtration according to claim 1, characterized in that: The filter material in the filter device is quartz sand.

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