Ceramic catalytic filtration system and working method thereof

Abstract

The invention relates to the technical field of PAN-based carbon fiber production tail gas filtration, in particular to a ceramic catalytic filtration system and a working method thereof, and the ceramic catalytic filtration system comprises a qualified waste gas collection chamber, a ceramic catalytic filtration chamber, a ceramic catalytic filtration pipe, a compressed air distribution system and an air valve switching system; by sequentially controlling a waste gas switching valve, a filtering chamber control valve and a compressed air control valve corresponding to each ceramic catalytic filtering chamber, circulating switching of a filtering passage and a back flushing passage is realized, an online back flushing function is realized, and through accurate control of an air valve switching system, the production efficiency can be greatly improved under the condition that production is not stopped. The ceramic catalytic filter tube in a certain cavity is subjected to back flushing and cleaning, meanwhile, other ceramic catalytic filter cavities continue to conduct normal waste gas filtering work, time loss caused by shutdown in the cleaning and maintaining process is remarkably reduced, and the continuous operation capacity and the overall efficiency of a production line are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas filtration in the production of PAN-based carbon fibers, and in particular to a ceramic catalytic filtration system and a working method thereof. Background Art

[0002] PAN-based carbon fiber is the main type of carbon fiber on the market. During the production of PAN-based carbon fiber, harmful gases such as NOx, HCN, NH3 and some solid particulate matter will be released. In order to meet the increasingly stringent exhaust emission requirements, the exhaust gas needs to be purified. The temperature of this part of the gas is generally maintained between 250-300°C. It is difficult to meet the requirements using conventional bag dust removal equipment. The use of ceramic catalytic filter tubes can meet the exhaust gas purification and filtration functions at higher temperatures (400-500°C).

[0003] However, during the use of traditional filtration systems, particulate matter often clogs the surface of the ceramic catalytic filter tube, making it impossible to clean it online and requiring the system to be shut down for cleaning. Long-term equipment shutdown and cleaning will lead to a decrease in the efficiency of the entire production line, making it difficult to meet the market's continued demand for carbon fiber products.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The present invention provides a ceramic catalytic filtration system and a working method thereof, thereby effectively solving the problems pointed out in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A ceramic catalytic filtration system, comprising: a qualified exhaust gas collecting chamber, a ceramic catalytic filtration chamber, a compressed air distribution system and a wind valve switching system; At least two of the ceramic catalytic filter chambers are arranged in parallel at the bottom of the qualified exhaust gas collecting chamber; Each of the ceramic catalytic filter chambers includes a plurality of ceramic catalytic filter tubes, which are arranged on the top wall of the ceramic catalytic filter chamber, and the ceramic catalytic filter tubes include ceramic fibers and a plurality of catalysts arranged on the surface of the ceramic fibers; The compressed air distribution system is used to evenly distribute the compressed air to each of the ceramic catalytic filter tubes, and includes a compressed air distributor disposed in the qualified exhaust gas collecting chamber and corresponding to each of the ceramic catalytic filter tubes one by one; The air valve switching system is used to realize different air flow paths, including a filter chamber control valve arranged in the qualified exhaust gas collecting chamber and corresponding to the ceramic catalytic filter tubes one by one; a compressed air control valve arranged at the top of each compressed air distributor, and an exhaust gas switching valve arranged at the bottom of each ceramic catalytic filter tube; Wherein, the exhaust gas enters the ceramic catalytic filter tube from the outside to the inside of the ceramic catalytic filter chamber, and flows into the qualified exhaust gas collecting chamber to form a filtering passage; At the same time, low-temperature compressed air enters from the compressed air distributor to backwash the ceramic catalytic filter tube in at least one of the ceramic catalytic filter chambers from the inside out, and the airflow blows off the solid particles accumulated on the ceramic catalytic filter tube to form a backwashing passage.

[0007] Furthermore, the ceramic catalytic filter tube is formed by curing and compressing the ceramic fiber.

[0008] Furthermore, by adjusting the porosity of the ceramic fibers, particles of different levels can be filtered.

[0009] Furthermore, it also includes a catalyst replenishing device connected to the compressed air distribution system, and the catalyst replenishing device is provided with a catalyst feeding control valve.

[0010] Furthermore, each ceramic catalytic filter chamber is provided with an ash collection outlet at the bottom, and the blown-off solid particles are discharged from the ash collection outlet.

[0011] Furthermore, a qualified waste gas discharge port is provided on the top of the qualified waste gas collecting chamber.

[0012] Furthermore, it also includes an exhaust gas induced draft fan arranged at the exhaust gas inlet.

[0013] The present invention also includes a working method of the ceramic catalytic filtration system as described above, comprising: Switching at least one of the ceramic catalytic filter chambers to a backwashing state; Backwashing state: the compressed air control valve corresponding to the ceramic catalytic filter chamber is opened, and the exhaust gas switching valve and the filter chamber control valve are closed; Switching the remaining ceramic catalytic filter chambers to a filtering state; Filtering state: the exhaust gas switching valve and the filter chamber control valve corresponding to the ceramic catalytic filter chamber are opened, and the compressed air control valve is closed; Switching the ceramic catalytic filter chamber that has completed backwashing cleaning to a filtering state, and switching another ceramic catalytic filter chamber in the filtering state to a backwashing cleaning state; The above steps are repeated to complete the backwashing of all the ceramic catalytic filter chambers.

[0014] Furthermore, the blockage condition of the ceramic catalytic filter tube is monitored in real time by a differential pressure sensor installed in each filter chamber, and when the differential pressure reaches a set critical value, the backwashing state is switched.

[0015] Further, the ceramic catalytic filter chamber is switched to a backwashing state, specifically comprising: A pressure difference sensor is installed on the air inlet side and the air outlet side of each ceramic catalytic filter chamber to monitor the pressure difference at both ends of the ceramic catalytic filter tube in real time; The differential pressure sensor collects pressure data of the front and rear ends of the ceramic catalytic filter chamber in real time, and transmits the data to the control system through the data acquisition system; The system calculates the real-time pressure difference value based on the pressure data and accumulates the data for analysis; Determine whether the real-time pressure difference value exceeds the set critical real-time pressure difference value, if so, the ceramic catalytic filter chamber automatically switches to the backwash state; if not, the ceramic catalytic filter chamber continues to be in the filtering state; During the backwashing process, the real-time differential pressure value is continuously monitored. When the real-time differential pressure value is less than the critical real-time differential pressure value, the backwashing state of the ceramic catalytic filter chamber ends and switches to the filtering state.

[0016] The technical solution of the present invention can achieve the following technical effects: By controlling the exhaust gas switching valve, filter chamber control valve and compressed air control valve corresponding to each ceramic catalytic filter chamber in turn, the cyclic switching of the filter passage and the backwashing passage is realized, and the online backwashing cleaning function is realized. Through the precise control of the air valve switching system, the ceramic catalytic filter tube in a certain chamber can be backwashed without stopping production, while other ceramic catalytic filter chambers continue to perform normal exhaust gas filtration work, which significantly reduces the time loss caused by downtime during cleaning and maintenance, and improves the continuous operation capability and overall efficiency of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a ceramic catalytic filtration system; Figure 2 A flow chart showing the working method of the ceramic catalytic filtration system.

[0019] Figure numerals: 1. Qualified exhaust gas collecting chamber; 11. Qualified exhaust gas discharge port; 2. Ceramic catalytic filter chamber; 21. Ash collection outlet; 3. Ceramic catalytic filter tube; 4. Compressed air distributor; 5. Filter chamber control valve; 6. Compressed air control valve; 7. Exhaust gas switching valve; 8. Catalyst replenishing device; 9. Catalyst feeding control valve; 10. Exhaust gas induced draft fan. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figure 1 As shown: A ceramic catalytic filtration system, comprising: a qualified exhaust gas collecting chamber 1, a ceramic catalytic filtration chamber 2, a compressed air distribution system and a wind valve switching system; At least two ceramic catalytic filter chambers 2 are arranged in parallel at the bottom of the qualified exhaust gas collecting chamber 1, which helps to increase the exhaust gas treatment flow rate; Each ceramic catalytic filter chamber 2 includes a plurality of ceramic catalytic filter tubes 3, which are arranged on the top wall of the ceramic catalytic filter chamber 2. The ceramic catalytic filter tubes 3 include ceramic fibers and a variety of catalysts arranged on the surface of the ceramic fibers; they are used to catalytically degrade harmful gases such as NOx, HCN, and NH3; The compressed air distribution system is used to evenly distribute the compressed air to each ceramic catalytic filter tube 3, and includes a compressed air distributor 4 which is arranged in the qualified exhaust gas collecting chamber 1 and corresponds to the ceramic catalytic filter tube 3 one by one; The air valve switching system is used to realize different air flow paths, including a filter chamber control valve 5 arranged in the qualified exhaust gas collecting chamber 1 and corresponding to the ceramic catalytic filter tube 3 one by one; a compressed air control valve 6 arranged at the top of each compressed air distributor 4, and an exhaust gas switching valve 7 arranged at the bottom of each ceramic catalytic filter tube 3; The exhaust gas enters the ceramic catalytic filter tube 3 from the outside to the inside of the ceramic catalytic filter chamber 2, and flows into the qualified exhaust gas collecting chamber 1 to form a filtering passage; At the same time, low-temperature compressed air enters from the compressed air distributor 4 to backwash the ceramic catalytic filter tube 3 in at least one ceramic catalytic filter chamber 2 from the inside out. The airflow blows off the solid particles accumulated on the ceramic catalytic filter tube 3 to form a backwashing passage.

[0023] The working principle is as follows: Figure 1 , the exhaust gas containing VOC enters the ceramic catalytic filter chamber 2 after passing through the exhaust gas switching valve 7, and when the exhaust gas flows from the outside to the inside through the ceramic catalytic filter tube 3, it contacts with multiple groups of catalysts in the ceramic catalytic filter tube 3 to achieve degradation, and then flows into the qualified exhaust gas collecting chamber 1 to form a filtering passage; At the same time, the particulate matter is blocked by the fiber mesh in the ceramic catalytic filter tube 3, and accumulates outside the ceramic catalytic filter tube 3 to form a particle block. The accumulated particle block can be separated from the outer wall surface of at least one ceramic catalytic filter tube 3 by back-blowing compressed air from the inside of the tube to the outside of the tube, forming a back-blowing cleaning passage; By sequentially controlling the exhaust gas switching valve 7, the filter chamber control valve 5 and the compressed air control valve 6 corresponding to each ceramic catalytic filter chamber 2, the cyclic switching of the filter passage and the backwashing passage is realized, and the online backwashing cleaning function is realized. Through the precise control of the air valve switching system, the ceramic catalytic filter tube 3 in a certain chamber can be backwashed without stopping production, while other ceramic catalytic filter chambers 2 continue to perform normal exhaust gas filtering work, which significantly reduces the time loss caused by downtime during cleaning and maintenance, and improves the continuous operation capability and overall efficiency of the production line.

[0024] Without stopping the machine, the backflush and ash cake recovery loop can be used to regenerate the catalyst, that is, the loop is used to pass the gas flow carrying the catalyst liquid through the ceramic catalytic filter tube 3, thereby increasing the service life of the ceramic catalytic filter tube 3.

[0025] The accumulation of particulate matter in traditional filtration systems will lead to increased pressure loss, which forces the exhaust draft fan 10 to increase its power and leads to increased energy consumption. This technical solution effectively removes particulate matter accumulated on the surface of the ceramic catalytic filter tube 3 through online backwashing and cleaning, keeps the surface of the ceramic catalytic filter tube 3 clean, and reduces the system pressure loss; in addition, backwashing with low-temperature compressed air can cool the ceramic catalytic filter tube 3 to prevent it from overheating, and avoid aging and damage of the ceramic catalytic filter tube 3 caused by high temperature, thereby further reducing the energy consumption and operating costs of the system; at the same time, the introduced cold compressed air can reduce the temperature of the ceramic catalytic filter tube 3, thereby adapting to the higher temperature incoming exhaust gas, and improving the scope of use of the system.

[0026] Continue to refer Figure 1In the present embodiment, the number of ceramic catalytic filter chambers 2 is three, and the ceramic catalytic filter tubes 3 in one of the ceramic catalytic filter chambers 2 are backwashed each time, and the ceramic catalytic filter tubes 3 in the other two ceramic catalytic filter chambers 2 are filtered. After three cycles of switching the filtration passage and the backwashing passage, all three ceramic catalytic filter chambers 2 in the system can be cleaned. The number of ceramic catalytic filter chambers 2 can also be other numbers, all within the protection scope of the present application.

[0027] As a preferred embodiment of the above embodiment, the ceramic catalytic filter tube 3 is made of ceramic fiber through a curing and compression process. The ceramic fiber structure after the curing and compression process is tighter, which reduces the brittleness and breakage risk of the ceramic catalytic filter tube 3, significantly improves the structural strength and high temperature resistance of the ceramic catalytic filter tube 3, meets the requirements for treating high-temperature exhaust gas in the production process of PAN-based carbon fiber, ensures that it is not easily damaged during high-pressure backwash cleaning, and extends its service life.

[0028] In this embodiment, by adjusting the porosity of the ceramic fiber, different levels of particulate matter are filtered, thereby filtering out particulate matter of levels such as PM10, PM5 and PM2.5 mixed in the exhaust gas. This flexible design enables the system to accurately control the filtering effect, effectively intercept particulate matter of different sizes, meet the requirements of various industrial waste gas emission standards, and ensure that the filtered gas meets the emission standards of environmental protection regulations.

[0029] Among them, it also includes a catalyst replenishing device 8 connected to the compressed air distribution system. The catalyst replenishing device 8 is provided with a catalyst feeding control valve 9. On the one hand, catalyst solvent / reagent can be added to the backblown air flow to achieve online replenishment of the catalyst in the ceramic catalytic filter tube 3, which solves the defect of traditional systems that require shutdown and replacement due to catalyst consumption, and greatly improves the continuous operation capability and production efficiency of the system; on the other hand, the function of online catalyst replenishment ensures that there is always enough active catalyst on the surface of the ceramic catalytic filter tube 3, thereby maintaining the ability to efficiently catalyze and degrade harmful gases such as NOx, HCN, NH3, etc. The continuous and efficient catalytic reaction not only improves the removal rate of pollutants, but also reduces the concentration of harmful gas emissions, further improving the effect of exhaust gas treatment.

[0030] As a preferred embodiment of the above embodiment, each ceramic catalytic filter chamber 2 is provided with an ash collection outlet 21 at the bottom, and the blown-off solid particles are discharged from the ash collection outlet 21, thereby preventing these particles from re-entering the airflow and preventing the occurrence of secondary pollution.

[0031] In this embodiment, a qualified waste gas discharge port 11 is provided at the top of the qualified waste gas collecting chamber 1 to ensure that the purified waste gas can be discharged smoothly, prevent gas reflux caused by poor discharge, and avoid mixing of purified qualified waste gas with unpurified waste gas, thereby further ensuring the purification effect and emission quality of the system; in addition, the qualified waste gas discharge port 11 is located at the top position to reduce the residence time of the waste gas inside the system, reduce the safety hazards caused by the accumulation of harmful gases, help maintain the gas fluidity inside the system, and improve the overall safety of the system.

[0032] Among them, it also includes an exhaust draft fan 10 arranged at the exhaust gas inlet. The exhaust draft fan 10 can adjust the air volume and wind speed according to the change of the exhaust gas flow rate, ensuring that the system can maintain a good treatment effect under different working conditions. No matter how the concentration and flow rate of the exhaust gas change, the draft fan can provide appropriate airflow intensity, thereby improving the system's processing capacity and operating flexibility.

[0033] The present invention also includes a method for operating the ceramic catalytic filtration system as described above, such as Figure 2 As shown, including: S10: Switching at least one ceramic catalytic filter chamber 2 to a backwashing state; Backwashing state: the compressed air control valve 6 corresponding to the ceramic catalytic filter chamber 2 is opened, and the exhaust gas switching valve 7 and the filter chamber control valve 5 are closed; this step removes particulate matter on the surface of the ceramic catalytic filter tube 3 and in the fiber gaps by backwashing, ensuring the continuous and efficient operation of the ceramic catalytic filter tube 3; S20: At the same time, the remaining ceramic catalytic filter chamber 2 is switched to a filtering state; Filtration state: the exhaust gas switching valve 7 and the filter chamber control valve 5 corresponding to the ceramic catalytic filter chamber 2 are opened, and the compressed air control valve 6 is closed; this step allows the exhaust gas to enter these chambers for catalytic degradation and filtration, thereby achieving exhaust gas purification; S30: Switch the ceramic catalytic filter chamber 2 that has completed backwashing to the filtering state, and switch the other ceramic catalytic filter chamber 2 in the filtering state to the backwashing state; this step ensures that each chamber can be backwashed periodically by alternating switching, so as to maintain the long-term operation and high-efficiency filtering capacity of the system; S40: Repeat the above steps to complete the backwashing of all the ceramic catalytic filter chambers 2.

[0034] By alternately switching backwashing and filtering states between multiple filter chambers, online cleaning is achieved. This method eliminates the problem of traditional systems requiring shutdown for cleaning due to particulate matter clogging the surface of the ceramic catalytic filter tube 3, thereby reducing equipment downtime and greatly improving the operating efficiency of the production line; the backwashing process can effectively remove particulate matter on the surface of the ceramic catalytic filter tube 3 and in the fiber gaps, ensuring the continuous and efficient operation of the ceramic catalytic filter tube 3. By regularly cleaning and switching the filter chambers, the system can maintain a stable purification effect during long-term operation; through effective particulate matter removal, the blockage and wear of the surface of the ceramic catalytic filter tube 3 are reduced, the service life of the ceramic catalytic filter tube 3 is extended, and the maintenance cost and replacement frequency are reduced; through the parallel operation of multiple chambers, it can be ensured that when each chamber is cleaned, other chambers can still continue to purify the exhaust gas, avoiding the decrease in purification efficiency due to the cleaning of a single chamber, thereby achieving a more stable and efficient exhaust gas purification effect.

[0035] In this embodiment, the number of ceramic catalytic filter chambers 2 is 3 as an example, and the complete ceramic catalytic filter tube 3 (CCF) catalytic filter box backwashing process is described (the following three ceramic catalytic filter chambers 2 are ①, ②, ③ from left to right), and the principle of this patent is explained: (1) Exhaust gas enters the air valve switching chamber from the exhaust gas induced draft fan 10, and then enters the ① and ② ceramic catalytic filter chambers 2 for catalytic degradation and filtration. At this time, the exhaust gas switching valves 7 of the ① and ② ceramic catalytic filter chambers 2 are opened, the compressed air control valves 6 of the ① and ② ceramic catalytic filter chambers 2 are closed, and the filter chamber control valves 5 of the ① and ② ceramic catalytic filter chambers 2 are opened. The qualified exhaust gas filtered flows out of the ① and ② ceramic catalytic filter chambers 2, enters the qualified exhaust gas collecting chamber 1, and flows out of the system. At the same time, the compressed air control valve 6 of the ③ ceramic catalytic filter chamber is opened, the filter chamber control valve 5 and the exhaust gas switching valve 7 of the ③ ceramic catalytic filter chamber 2 are closed, and low-temperature compressed air enters the ceramic catalytic filter tube 3 of the ③ ceramic catalytic filter chamber 2, sweeps the particulate matter between the outer wall surface and the fiber gap of the ceramic catalytic filter tube 3 from the inside out, and is discharged from the ash collection outlet 21 under positive pressure, thereby completing the backwashing of the ceramic catalytic filter tube 3 in the ③ ceramic catalytic filter chamber 2.

[0036] (2) The exhaust gas enters the air valve switching chamber from the exhaust gas induced draft fan 10, and then enters the ② and ③ ceramic catalytic filter chambers 2 for catalytic degradation and filtration. At this time, the exhaust gas switching valves 7 of the ② and ③ ceramic catalytic filter chambers 2 are opened, the compressed air control valves 6 of the ② and ③ ceramic catalytic filter chambers 2 are closed, and the filter chamber control valves 5 of the ② and ③ are opened. The qualified exhaust gas filtered by catalysis flows out of the ② and ③ ceramic catalytic filter chambers 2, enters the qualified exhaust gas collecting chamber 1, and flows out of the system. At the same time, the compressed air control valve 6 of the ① ceramic catalytic filter chamber 2 is opened, the filter chamber 2 control valve 5 and the exhaust gas switching valve 7 of the ① ceramic catalytic filter chamber are closed, and the low-temperature compressed air enters the ceramic catalytic filter tube 3 of the ① ceramic catalytic filter chamber 2, sweeps the particulate matter between the outer wall surface and the fiber gap of the ceramic catalytic filter tube 3 from the inside out, and is discharged from the ash collection outlet 21 under positive pressure, thereby completing the backwashing of the ceramic catalytic filter tube 3 in the ① ceramic catalytic filter chamber 2.

[0037] (3) The exhaust gas enters the air valve switching chamber from the exhaust gas induced draft fan 10, and then enters the ③ and ① ceramic catalytic filter chambers 2 for catalytic degradation and filtration. At this time, the exhaust gas switching valves 7 of the ③ and ① ceramic catalytic filter chambers 2 are opened, the compressed air control valves 6 of the ③ and ① ceramic catalytic filter chambers 2 are closed, and the filter chamber control valves 5 of the ③ and ① ceramic catalytic filter chambers 2 are opened. The qualified exhaust gas filtered flows out of the ③ and ① ceramic catalytic filter chambers 2, enters the qualified exhaust gas collecting chamber 1, and flows out of the system. At the same time, the compressed air control valve 6 of the ② ceramic catalytic filter chamber 2 is opened, the filter chamber control valve 5 and the exhaust gas switching valve 7 of the ② ceramic catalytic filter chamber 2 are closed, and the low-temperature compressed air enters the ceramic catalytic filter tube 3 of the ② ceramic catalytic filter chamber 2, sweeps the particulate matter between the outer wall surface and the fiber gap of the ceramic catalytic filter tube 3 from the inside out, and is discharged from the ash collection outlet 21 under positive pressure, thereby completing the backwashing of the ceramic catalytic filter tube 3 in the ② ceramic catalytic filter chamber 2.

[0038] The low-temperature compressed air can also cool the ceramic catalytic filter tube 3 to prevent it from overheating.

[0039] (3) During one operation cycle, the status of each valve is as follows: Ceramic catalytic filter chamber 1 2 3 1 2 3 1 2 3 Exhaust switching valve open open open open open open Compressed air control valve open open open Filter chamber control valve open open open open open open In this embodiment, in step S30, the blockage condition of the ceramic catalytic filter tube 3 is monitored in real time by a differential pressure sensor installed in each filter chamber. When the differential pressure reaches a set critical value, it switches to a backwashing state. This step detects the blockage degree of the filter chamber.

[0040] As a preferred embodiment of the above, in step S30, the ceramic catalytic filter chamber 2 is switched to a backwashing state, specifically including: S31: Install a pressure difference sensor on the air inlet and air outlet sides of each ceramic catalytic filter chamber 2 to monitor the pressure difference at both ends of the ceramic catalytic filter tube 3 in real time; S32: The differential pressure sensor collects the pressure data of the front and rear ends of the ceramic catalytic filter chamber 2 in real time, and transmits the data to the control system through the data acquisition system; S33: The system calculates the real-time differential pressure value based on the pressure data and accumulates the data for analysis; if the differential pressure continues to rise, it indicates that the accumulation of particulate matter on the surface and inside of the ceramic catalytic filter tube 3 is increasing; S34: Determine whether the real-time differential pressure value exceeds the set critical real-time differential pressure value. If so, the ceramic catalytic filter chamber 2 automatically switches to the backwashing state; if not, the ceramic catalytic filter chamber 2 continues to be in the filtering state; S35: During the backwashing process, the real-time pressure difference value is continuously monitored. When the real-time pressure difference value is less than the critical real-time pressure difference value, the backwashing state of the ceramic catalytic filter chamber 2 ends and switches to the filtering state.

[0041] A differential pressure sensor is installed on the air inlet and outlet sides of each ceramic catalytic filter chamber 2, which can accurately monitor the pressure difference at both ends of the ceramic catalytic filter tube 3, ensuring that the system can grasp the working status of the ceramic catalytic filter tube 3 in real time. Through this precise monitoring, the system can promptly detect and respond to blockages, avoiding a decrease in filtration efficiency due to untimely treatment of blockages.

[0042] By collecting pressure data in real time and performing cumulative analysis, the system can grasp the working trend of the ceramic catalytic filter chamber 2. The accumulation and analysis of data are not only used to determine the current degree of blockage, but also to predict possible blockage trends, further optimize the timing and frequency of backwashing, and improve the intelligence level of the system.

[0043] When the pressure difference exceeds the set critical value, the system can automatically switch to the backwash state, and automatically return to the filtering state after the pressure difference returns to the normal range. This automated adjustment mechanism ensures that the system always operates in the best state, reduces manual intervention, and improves overall operating efficiency.

[0044] The system continuously monitors the real-time differential pressure during the backwashing process to ensure that the cleaning process is accurate and in place, which not only avoids the waste of resources caused by excessive cleaning, but also prevents long-term blockage problems caused by insufficient cleaning. Through this dynamic maintenance strategy, the service life of the ceramic catalytic filter tube 3 and the filtration system is extended, and the overall maintenance cost of the equipment is reduced.

[0045] Intelligent monitoring and analysis functions optimize the backwashing process. Backwashing is performed only when it is really necessary, avoiding unnecessary energy consumption and thus reducing the operating cost of the system. This energy consumption optimization not only saves energy but also improves the economy of the system.

[0046] Through real-time pressure monitoring and data analysis, the system can quickly identify and deal with potential blockage problems, reduce the risk of failure caused by filter chamber blockage, improve the stability and reliability of system operation, and ensure long-term stable exhaust gas treatment effects.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ceramic catalytic filtration system, characterized in that: include: Qualified exhaust gas collecting chamber, ceramic catalytic filter chamber, compressed air distribution system and air valve switching system; At least two of the ceramic catalytic filter chambers are arranged in parallel at the bottom of the qualified exhaust gas collecting chamber; Each of the ceramic catalytic filter chambers includes a plurality of ceramic catalytic filter tubes, which are arranged on the top wall of the ceramic catalytic filter chamber, and the ceramic catalytic filter tubes include ceramic fibers and a plurality of catalysts arranged on the surface of the ceramic fibers; The compressed air distribution system is used to evenly distribute the compressed air to each of the ceramic catalytic filter tubes, and includes a compressed air distributor disposed in the qualified exhaust gas collecting chamber and corresponding to each of the ceramic catalytic filter tubes one by one; The air valve switching system is used to realize different air flow paths, including a filter chamber control valve arranged in the qualified exhaust gas collecting chamber and corresponding to the ceramic catalytic filter tubes one by one; a compressed air control valve arranged at the top of each compressed air distributor, and an exhaust gas switching valve arranged at the bottom of each ceramic catalytic filter tube; Wherein, the exhaust gas enters the ceramic catalytic filter tube from the outside to the inside of the ceramic catalytic filter chamber, and flows into the qualified exhaust gas collecting chamber to form a filtering passage; At the same time, low-temperature compressed air enters from the compressed air distributor to backwash the ceramic catalytic filter tube in at least one of the ceramic catalytic filter chambers from the inside out, and the airflow blows off the solid particles accumulated on the ceramic catalytic filter tube to form a backwashing passage.

2. The ceramic catalytic filtration system according to claim 1, characterized in that: The ceramic catalytic filter tube is formed by curing and compressing the ceramic fiber.

3. The ceramic catalytic filtration system according to claim 1, characterized in that: By adjusting the porosity of the ceramic fiber, particles of different levels can be filtered.

4. The ceramic catalytic filtration system according to claim 1, characterized in that: It also includes a catalyst replenishing device connected to the compressed air distribution system, and the catalyst replenishing device is provided with a catalyst feeding control valve.

5. The ceramic catalytic filtration system according to claim 1, characterized in that: An ash collecting outlet is provided at the bottom of each ceramic catalytic filter chamber, and the blown-off solid particles are discharged from the ash collecting outlet.

6. The ceramic catalytic filtration system according to claim 1, characterized in that: A qualified waste gas discharge port is arranged on the top of the qualified waste gas collecting chamber.

7. The ceramic catalytic filtration system according to claim 1, characterized in that: The utility model also comprises an exhaust gas induced draft fan arranged at the exhaust gas inlet.

8. A method for operating the ceramic catalytic filtration system as claimed in claim 1, characterized in that: include: Switching at least one of the ceramic catalytic filter chambers to a backwashing state; Backwashing state: the compressed air control valve corresponding to the ceramic catalytic filter chamber is opened, and the exhaust gas switching valve and the filter chamber control valve are closed; Switching the remaining ceramic catalytic filter chambers to a filtering state; Filtering state: the exhaust gas switching valve and the filter chamber control valve corresponding to the ceramic catalytic filter chamber are opened, and the compressed air control valve is closed; Switching the ceramic catalytic filter chamber that has completed backwashing cleaning to a filtering state, and switching another ceramic catalytic filter chamber in the filtering state to a backwashing cleaning state; The above steps are repeated to complete the backwashing of all the ceramic catalytic filter chambers.

9. The working method of the ceramic catalytic filtration system according to claim 8, characterized in that: The blockage condition of the ceramic catalytic filter tube is monitored in real time by a differential pressure sensor installed in each filter chamber. When the differential pressure reaches a set critical value, the filter is switched to the backwashing state.

10. The working method of the ceramic catalytic filtration system according to claim 8, characterized in that: The ceramic catalytic filter chamber is switched to a backwashing state, specifically comprising: A pressure difference sensor is installed on the air inlet side and the air outlet side of each ceramic catalytic filter chamber to monitor the pressure difference at both ends of the ceramic catalytic filter tube in real time; The differential pressure sensor collects pressure data of the front and rear ends of the ceramic catalytic filter chamber in real time, and transmits the data to the control system through the data acquisition system; The system calculates the real-time pressure difference value based on the pressure data and accumulates the data for analysis; Determine whether the real-time pressure difference value exceeds the set critical real-time pressure difference value, if so, the ceramic catalytic filter chamber automatically switches to the backwash state; if not, the ceramic catalytic filter chamber continues to be in the filtering state; During the backwashing process, the real-time differential pressure value is continuously monitored. When the real-time differential pressure value is less than the critical real-time differential pressure value, the backwashing state of the ceramic catalytic filter chamber ends and switches to the filtering state.

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