High-temperature-resistant and heat-vibration-resistant ceramic fiber filter tube and air guide assembly composed of high-temperature-resistant and heat-vibration-resistant ceramic fiber filter tube

Abstract

The utility model provides a ceramic fiber filter tube with high temperature resistance and thermal vibration resistance, which comprises a rigid framework and a ceramic fiber filter membrane, the rigid framework is a tube body with one open end and one sealed end, a plurality of vent holes are arranged on the rigid framework, and the ceramic fiber filter membrane is fixedly coated on the outer edge surface of the rigid framework. According to the ceramic fiber filter tube, the ceramic fiber filter tube is divided into the tube body type rigid framework and the ceramic fiber filter membrane wrapped outside the rigid framework, and the rigid framework is arranged on the premise that the basic filtering and purifying functions are met, on one hand, the connecting strength of the sealing position of the ceramic fiber filter tube and a faceplate in the purifying device can be effectively improved; on the other hand, thermal shock impact of the ceramic fiber filter pipe can be effectively avoided, the service life of the ceramic fiber filter pipe is effectively prolonged, and daily maintenance and repair workload is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter device technical field especially, relates to a kind of ceramic fiber filter tube and the air guide assembly consisting of it of high temperature resistance and heat shock resistance. BACKGROUND

[0002] Ceramic fiber filter tube is the core element of high-temperature flue gas purification device, compared with traditional filter bag, ceramic fiber filter tube has the advantages of high temperature resistance, corrosion resistance, erosion resistance, high precision, easy to load catalyst, etc., and is the ideal dust removal and purification filter element at present. Generally speaking, ceramic fiber filter tube is a tubular filter element composed of ceramic fiber. Due to its high porosity and high temperature resistance, it can be used for filtering industrial high-temperature exhaust gas, such as filtering exhaust gas discharged by industrial combustion. When in use, the ceramic fiber filter tube is installed in the filter, one end of the filter is connected to the air extraction device, and the pressure inside the ceramic fiber filter tube is reduced by the air extraction device, so that the exhaust gas is sucked from the outside to the inside of the ceramic fiber filter tube, and the dust contained in the exhaust gas is isolated on the outer wall of the ceramic fiber filter tube, so as to achieve the filtering effect. After a period of work, a thick dust layer is accumulated on the outer surface of the ceramic fiber filter tube, forming a filter cake, which affects the filtering effect. At this time, the ceramic fiber filter tube needs to be backflushed. The general backflushing system is to make high-pressure gas penetrate from the inside to the outside of the ceramic fiber filter tube, so as to separate the filter cake from the outer surface of the ceramic fiber filter tube, thereby restoring the filtering efficiency.

[0003] However, ceramic fiber filter tube still has the following shortcomings: (1) due to its rigidity, high brittleness and high porosity, its strength is low, and it may be broken and disintegrated at the clamping end or other stress ends when subjected to external force (such as the small longitudinal thermal expansion of the sealing part of the ceramic fiber filter tube and the chuck in the purification device, which may cause the breakage of the ceramic fiber filter tube), causing inconvenience in use, and increasing the use cost due to frequent replacement. (2) Although ceramic filter material has the above advantages, for production processes such as converter or electric furnace steelmaking, i.e. the treated flue gas is always in an alternating cycle of rapid heating and rapid cooling, when ceramic fiber filter tube is used for filtering and purifying superhigh-temperature flue gas (i.e. flue gas temperature ≥ 550-950℃), the ceramic fiber filter tube is subjected to large alternating thermal stress (thermal shock). Under the action of alternating thermal stress, the service life of the ceramic fiber filter tube is short, and the daily maintenance and repair workload is large, which will have a great impact on the converter or electric furnace steelmaking. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art. The utility model provides a ceramic fiber filter tube and an air guide assembly consisting of it, which can be effectively applied to the high-temperature flue gas filtering and purifying process.

[0005] To solve the above technical problems, the utility model adopts the technical scheme: a kind of ceramic fiber filter tube of high temperature resistance and heat shock resistance, including rigid framework and ceramic fiber filter membrane, the rigid framework is the pipe body of one end opening one end sealing, several air holes are opened in the rigid framework, the ceramic fiber filter membrane is fixedly covered on the outer edge surface of the rigid framework.

[0006] Further, several air hole rings are arranged along the length direction of the rigid framework, and the spacing between adjacent air holes in each air hole ring is the same.

[0007] Further, adjacent air hole rings are arranged in a staggered manner.

[0008] Further, the opening rate of the air holes on the rigid framework is 75-85%.

[0009] Further, a fitting ring and a limiting ring are fixedly arranged on the opening end of the rigid framework, and the fitting ring and the limiting ring are sequentially fixedly arranged on the opening end of the rigid framework.

[0010] Further, the inner diameter of the limiting ring and the fitting ring is the same as the inner diameter of the rigid framework, the outer diameter of the fitting ring and the limiting ring is greater than the outer diameter of the rigid framework, and the outer diameter of the limiting ring is greater than the outer diameter of the fitting ring.

[0011] Further, a plurality of cam ring strips are fixedly arranged on the outer edge surface of the upper section of the rigid framework at equal intervals.

[0012] Further, the end of the ceramic fiber filter membrane is fixedly arranged on the lower surface of the fitting ring and tightly adheres to the outer edge surface of the rigid framework.

[0013] Further, the rigid framework is composed of a phase change heat storage material, and the phase change heat storage material is any one of a metal and alloy phase change heat storage material, a molten salt phase change heat storage material, a carbonate phase change heat storage material, a metal-based composite phase change heat storage material, and a ceramic-based composite phase change heat storage material.

[0014] Further, a gas guide assembly is composed of a gas guide sleeve and a ceramic fiber filter tube of high temperature resistance and heat shock resistance, the gas guide sleeve is a hollow through structure, a notch is arranged on the upper end of the gas guide sleeve, the notch has the same inner diameter as the outer diameter of the fitting ring, and the gas guide sleeve is also composed of a phase change heat storage material.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1) by the ceramic fiber filter tube is split into by the tube type rigid framework and the ceramic fiber filter membrane which is covered outside the rigid framework, the rigid framework is set under meeting the basic filtration purification function, on the one hand can effectively improve the connection strength of ceramic fiber filter tube and the sealing of the chuck in the purification device, on the other hand can effectively avoid the thermal shock impact of ceramic fiber filter tube, effectively improve the service life of ceramic fiber filter tube, reduce the daily maintenance and maintenance workload;

[0017] 2) by the rigid framework of the ceramic fiber filter tube is made of phase change heat storage material, so that the ceramic fiber filter tube has the functions of filtration and purification treatment and heat accumulator, when high-temperature flue gas passes through the ceramic fiber filter tube for filtration and purification treatment, part of the heat of the high-temperature flue gas can be stored in the ceramic fiber filter tube, and when low-temperature flue gas passes through the ceramic fiber filter tube for filtration and purification treatment, the stored heat can be released to heat the ceramic fiber filter membrane, ensuring that the ceramic fiber filter tube works in a relatively constant temperature range and effectively avoiding the ceramic fiber filter tube from being subjected to large alternating thermal stress. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present application. In the drawings, the same reference numerals are used to refer to the same parts. Among them:

[0019] Figure 1 The cross-sectional structure of the high-temperature-resistant and thermal-shock-resistant ceramic fiber filter tube is schematically shown;

[0020] Figure 2 The enlarged structure of the high-temperature-resistant and thermal-shock-resistant ceramic fiber filter tube is schematically shown;

[0021] Figure 3 The local enlarged structure of region A is schematically shown;

[0022] Figure 4 The cross-sectional structure of the air guide assembly is schematically shown;

[0023] Figure 5 The cross-sectional structure of the axial cyclone is schematically shown.

[0024] Reference numerals in the drawings: 1-rigid framework, 2-ceramic fiber filter membrane, 3-vent hole, 4-vent hole ring, 5-limiting ring, 6-embedded ring, 7-cam ring strip, 8-air guide sleeve, 9-separation cavity, 10-vortex flow guide piece. DETAILED DESCRIPTION

[0025] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0026] Figure 1 The schematic diagram shows a cross-sectional view of a high-temperature and thermally shock resistant ceramic fiber filter tube, such as... Figure 1 As shown, the device includes a rigid frame 1 and a ceramic fiber filter membrane 2. The rigid frame 1 is a tube with one open end and one closed end, and several ventilation holes 3 are formed on the rigid frame 1. The ceramic fiber filter membrane 2 is fixedly wrapped around the outer edge of the rigid frame 1 by winding. By dividing the entire ceramic fiber filter tube into two parts, the rigid frame 1 enhances the rigidity and strength of the ceramic fiber filter tube and solves the problem of the strength of the seal between the ceramic fiber filter tube and the flower plate in the purification device, thereby avoiding the possibility of the ceramic fiber filter tube breaking.

[0027] Figure 2 The schematic diagram shows an enlarged structure of a ceramic fiber filter tube that is resistant to high temperatures and thermal shock, such as... Figure 2 As shown, a plurality of ventilation hole rings 4 are provided on the rigid frame 1 along its length direction; in each ring of ventilation hole rings 4, the spacing between adjacent ventilation holes 3 is the same; the spacing between the ventilation hole rings 4 can be the same or different, as long as it can ensure that the opening rate of the ventilation holes 3 opened on the rigid frame 1 is 75-85%.

[0028] In some embodiments, the vent holes 3 in adjacent vent rings 4 are equally spaced along the length of the rigid frame 1; while in other embodiments, such as Figure 2 As shown, adjacent vent rings 4 are staggered. Specifically, the upper vent ring 4 has vent holes 3 evenly spaced on the outer edge of the rigid frame 1, and the lower vent ring 4 also has vent holes 3 evenly spaced on the outer edge of the rigid frame 1. The difference is that the lower vent holes 3 are positioned at the distance between adjacent vent holes 3 in the upper vent ring 4, thus achieving the staggered arrangement of adjacent vent rings 4. Furthermore, in the aforementioned multi-ring vent rings 4, the vent holes 3 in the spaced-apart multi-ring vent rings 4 are all evenly spaced along the length of the rigid frame 1. That is, the staggered arrangement of the vent rings 4 only applies to adjacent vent rings 4, while the positions of the vent holes 3 in the spaced-apart staggered vent rings 4 are completely consistent, differing only in their different heights on the rigid frame 1.

[0029] The rigid skeleton 1 has an open end and a closed end, and the closed end is actually a semicircular structure. Therefore, the air hole ring 4 arranged thereon needs to be positioned at equal angles according to the semicircular structure, and the air holes 3 are arranged along the thickness direction of the rigid skeleton 1. The spacing between adjacent air holes 3 in the air hole ring 4 arranged at this position is still the same, but compared with the straight section of the rigid skeleton 1, the spacing between adjacent air holes 3 can be reduced, and the air holes 3 in this area can be arranged by staggered arrangement.

[0030] As shown in Figure 2 , the fitting ring 6 and the limiting ring 5 are fixedly arranged at the open end of the rigid skeleton 1. The fitting ring 6 and the limiting ring 5 are sequentially fixedly arranged at the open end of the rigid skeleton 1. The inner diameter of the aforementioned limiting ring 5 and the fitting ring 6 is the same as the inner diameter of the rigid skeleton 1, that is, the inner walls of the open end of the rigid skeleton 1, the limiting ring 5 and the fitting ring 6 are smoothly connected as a whole. The outer diameter of the fitting ring 6 and the limiting ring 5 is larger than the outer diameter of the rigid skeleton 1, and the outer diameter of the limiting ring 5 is larger than the outer diameter of the fitting ring 6, so that the open end of the rigid skeleton 1, the fitting ring 6 and the limiting ring 5 form a structure like a ladder, which is used to fix the ceramic fiber filter tube.

[0031] Figure 3 The local enlarged structure of the area A is schematically shown, as shown in Figure 3 , a plurality of cam ring strips 7 are fixedly arranged at equal intervals on the outer edge surface of the upper section of the rigid skeleton 1. The end of the ceramic fiber filter membrane 2 is fixedly arranged on the lower surface of the fitting ring 6 and tightly adheres to the outer edge surface of the rigid skeleton 1. The cam ring strips 7 arranged on the rigid skeleton 1 can increase the contact area between the ceramic fiber filter membrane 2 and the upper section of the rigid skeleton 1, and form multiple labyrinth structures, which can more effectively ensure the bonding strength and sealing performance between the upper section of the rigid skeleton 1 and the ceramic fiber filter membrane 2. The opening rate of the ceramic fiber filter membrane 2 arranged therein is 85-90%, which is used for effectively and super-cleanly filtering high-temperature flue gas.

[0032] It is worth mentioning that the aforementioned rigid skeleton 1 is made of phase change heat storage material, which is any one of metal and alloy phase change heat storage material, molten salt phase change heat storage material, carbonate phase change heat storage material, metal-based composite phase change heat storage material, and ceramic-based composite phase change heat storage material. The alloy phase change heat storage material includes aluminum-silicon alloy phase change heat storage material and copper alloy phase change heat storage material. The molten salt phase change heat storage material includes fluorine salt and its eutectic compound, such as LiF-NaF-KF eutectic salt. The carbonate phase change composite material is, for example, Li2CO3-Na2CO3-K2CO3 eutectic salt. The metal-based composite phase change heat storage material includes, for example, aluminum-based / silicon carbide composite phase change heat storage material. The ceramic-based composite phase change heat storage material includes, for example, zirconia / inorganic salt composite phase change heat storage material, which can be selected as needed. The rigid skeleton 1 of the ceramic fiber filter tube made of phase change heat storage material can have the heat accumulator function while having the basic function. Specifically, when high-temperature flue gas (T≥750-950°C) passes through the ceramic fiber filter tube for filtration and purification treatment, the rigid skeleton 1 made of phase change heat storage material in the ceramic fiber filter tube stores part of the heat of the high-temperature flue gas in it through its huge latent heat capacity. When low-temperature flue gas (T≤450-550°C) passes through the ceramic fiber filter tube for filtration and purification treatment, the rigid skeleton 1 made of phase change heat storage material in the ceramic fiber filter tube releases the heat stored in it when the high-temperature flue gas passes through, and heats the ceramic fiber filter membrane 2 of the ceramic fiber filter tube. The rigid skeleton 1 of the ceramic fiber filter tube made of phase change heat storage material stores and releases the heat energy of the high-temperature flue gas during the filtration and purification treatment of the high-temperature flue gas, to solve the contradiction between the supply and demand of heat energy in time and intensity, and basically ensure that the ceramic fiber filter tube works in a relatively constant high temperature range, thereby effectively avoiding the production process characteristics (i.e., the flue gas is always in an alternating cycle of rapid heating and rapid cooling) of a converter or an electric furnace for steelmaking, etc., so that the ceramic fiber filter tube is subjected to a large alternating thermal stress (thermal shock impact).

[0033] Figure 4 The cross-sectional structure of the air guide assembly is schematically shown as Figure 4As shown, the air guide assembly is composed of the air guide pipe and the aforementioned ceramic fiber filter pipe with high temperature resistance and thermal shock resistance. The air guide pipe is a hollow through structure, and a notch is arranged at the upper end of the air guide sleeve 8 for inserting the ceramic fiber filter pipe. The inner diameter of the notch is the same as the outer diameter of the fitting ring 6, that is, when the ceramic fiber filter pipe is inserted into the air guide sleeve 8 from the notch, the fitting ring 6 can be embedded in the notch, and the limiting ring 5 is located on the upper surface of the air guide sleeve 8. The limiting ring 5 can be fixed on the upper surface of the air guide sleeve 8 by bolts. The air guide sleeve 8 is also made of the same phase change heat storage material as the rigid framework 1 of the ceramic fiber filter pipe. The high-temperature flue gas enters the air guide sleeve 8 from the lower end, and the ceramic fiber filter pipe in the air guide sleeve 8 completes the filtration and purification of the high-temperature flue gas, and then outputs clean gas from the open end of the ceramic fiber filter pipe.

[0034] The aforementioned air guide assembly can be applied to the axial cyclone, Figure 5 The cross-sectional structure of the axial cyclone is schematically shown as Figure 5 As shown, the axial cyclone includes an air guide assembly and a separation cavity 9. The separation cavity 9 includes a first vertical section, a second vertical section, and an inclined section. One end of the inclined section is connected to the lower end edge of the first vertical section, and the other end is connected to the upper end edge of the second vertical section. The diameter of the first vertical section is greater than that of the second vertical section. The first vertical section, the second vertical section, and the inclined section are located on the same axis, so that the separation cavity 9 is actually a reverse conical structure with decreasing inner diameter from top to bottom.

[0035] The width of the air guide assembly is less than the width of the first vertical section of the separation cavity 9. The air guide assembly and the separation cavity 9 are located on the same axis, and the lower end of the air guide assembly is embedded and fixed in the first vertical section of the separation cavity 9. Specifically, a plurality of vortex flow guide pieces 10 are fixedly arranged in the first vertical section based on the inner wall of the first vertical section. The air guide assembly is embedded and fixed based on the other end of the vortex flow guide piece 10, that is, the aforementioned vortex flow guide piece 10 is fixedly arranged based on the outer wall of the air guide assembly extending into the first vertical section and the inner wall of the first vertical section.

[0036] The ceramic fiber filter pipe arranged in the air guide sleeve 8 at the center of each cyclone of the axial cyclone realizes the ultra-clean filtration of the high-temperature flue gas, reaches the environmental protection standard export concentration <5-10 mg / Nm³, and can also avoid the impact and wear of the dust in the high-temperature flue gas on the waste heat boiler, avoid the dust in the high-temperature flue gas from gathering, blocking, and structuring on the heat exchange surface of the waste heat boiler, and improve the stability and safety of the operation of the entire high-temperature flue gas purification and filtration and full waste heat recovery system.

[0037] By setting the air guide sleeve 8 and the vortex flow guide vane 10 in the separation cavity 9, the high-temperature dust and sparks contained in the high-temperature flue gas can be effectively removed first, the probability of gas explosion is reduced, the high-temperature flue gas is coarsely purified, the workload of the ceramic fiber filter tube purification and filtration treatment is reduced, and the impact and wear of the dust in the high-temperature flue gas on the ceramic fiber filter tube are reduced.

[0038] The technical scope of the utility model is not limited to the content in the above description, and the above embodiment can be variously deformed and modified by those skilled in the art without departing from the technical thought of the utility model, and these deformations and modifications should all belong to the protection scope of the utility model.

Claims

1. A high temperature and thermal shock resistant ceramic fiber filter tube, characterized by, The application relates to a high-temperature-resistant and thermal-vibration-resistant ceramic fiber filter pipe which comprises a rigid framework (1) and a ceramic fiber filter membrane (2), the rigid framework (1) is a pipe body with one end open and the other end sealed, a plurality of air holes (3) are formed on the rigid framework (1), and the ceramic fiber filter membrane (2) is fixedly covered on the outer edge surface of the rigid framework (1).

2. The high temperature and thermal shock resistant ceramic fiber duct of claim 1, wherein, A plurality of air hole rings (4) are arranged along the length direction of the rigid framework (1), the spacing between adjacent air holes (3) in each air hole ring (4) is the same.

3. The high temperature and thermal shock resistant ceramic fiber duct of claim 2, wherein, The adjacent air hole rings (4) are arranged in a staggered mode.

4. The high temperature and thermal shock resistant ceramic fiber duct of claim 3, wherein, The opening rate of the air holes (3) on the rigid framework (1) is 75-85%.

5. The high temperature and thermal shock resistant ceramic fiber duct of claim 1, wherein, A fitting ring (6) and a limiting ring (5) are fixedly arranged on the open end of the rigid framework (1), and the fitting ring (6) and the limiting ring (5) are sequentially fixedly arranged on the open end of the rigid framework (1).

6. The high temperature and thermal shock resistant ceramic fiber duct of claim 1, wherein, The inner diameters of the limiting ring (5) and the fitting ring (6) are the same as the inner diameter of the rigid framework (1), the outer diameters of the fitting ring (6) and the limiting ring (5) are larger than the outer diameter of the rigid framework (1), and the outer diameter of the limiting ring (5) is larger than the outer diameter of the fitting ring (6).

7. The high temperature and thermal shock resistant ceramic fiber duct of claim 6, wherein, A plurality of cam ring strips (7) are fixedly arranged on the outer edge surface of the upper section of the rigid framework (1) at equal intervals.

8. The high temperature and thermal shock resistant ceramic fiber duct of claim 6, wherein, The end of the ceramic fiber filter membrane (2) is fixedly arranged on the lower surface of the fitting ring (6) and tightly abuts against the outer edge surface of the rigid framework (1).

9. The high temperature and thermal shock resistant ceramic fiber duct of claim 1, wherein, The rigid framework (1) is made of a phase change heat storage material, and the phase change heat storage material is any one of a metal and alloy phase change heat storage material, a molten salt phase change heat storage material, a carbonate phase change heat storage material, a metal-based composite phase change heat storage material and a ceramic-based composite phase change heat storage material.

10. A gas guide assembly, characterized by, The application further relates to a high-temperature-resistant and thermal-vibration-resistant ceramic fiber filter pipe which comprises a gas guide sleeve (8) and the ceramic fiber filter pipe as claimed in any one of claims 1-9, the gas guide sleeve (8) is a hollow through structure, a notch for inserting the ceramic fiber filter pipe is arranged on the upper end of the gas guide sleeve (8), the inner diameter of the notch is the same as the outer diameter of the fitting section, and the gas guide sleeve (8) is also made of a phase change heat storage material.

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