WO2020244456A1 - Device for dedusting by low-pressure blow-back breathing method using high-temperature wall-flow-type ceramic membrane filtration - Google Patents

Abstract

A device for dedusting by means of a low-pressure blow-back breathing method using high-temperature wall-flow-type ceramic membrane filtration and a dedusting and filtering method, the device comprising an upper tank (20) and a lower tank (5), wherein the inside of the upper tank (20) is divided into at least two sealed cavities by a transversal tank-separating plate (25) and/or a longitudinal tank-separating plate (18); at least one filter body assembly (8) internally provided with a ceramic membrane filter element (6) is arranged in each cavity; the lower end of the lower tank (5) communicates with the upper end of a funnel (1), and the lower end of the funnel (1) is provided with a dust exhaust valve (17); an interface connected to a dust-containing pipe (2) is disposed at one side of the funnel (1); a smoke discharge pipe (19) and a reverse air blowing pipe (9) are disposed on the side face of each cavity separately, the smoke discharge pipes (19) being connected to exhaust fans (15), and the reverse air blowing pipes (9) being connected to a reverse air blower (14). The present device alternatively performs on-line filtration and low-pressure breathing blow-back cleaning, so that damage done to ceramic membrane filter elements (6) by high-pressure pulse wind may be avoided, the service life of the ceramic membrane filter elements (6) is prolonged, and thus the usage costs of a user are lowered.

Description

High-temperature wall-flow ceramic membrane filter low-pressure back-blowing breathing method dust removal equipment

Priority: (a high-temperature ceramic wall flow membrane filtration low pressure breathing dust cleaning equipment Title) Chinese Patent Application This application claims the application June 5, 2019 Application No. 201910484735.9.

Technical field

The invention relates to high-temperature dust removal equipment, in particular to a high-temperature wall-flow ceramic membrane filter low-pressure back-blowing breathing method dust removal equipment.

Background technique

At present, in the treatment method of high temperature exhaust gas containing dust, the filters that are used more are basically high temperature cloth bags, ceramic membrane tubes and glass fiber membrane tubes. Because of their thick filter wall layer, the wall thickness of the cloth bag filter layer ﹥5MM, ceramic The wall thickness of the filter layer of the membrane tube and the glass fiber membrane tube is ﹥8MM, and the back pressure is large, generally greater than ﹥700PA. In the process of back blowing and dust removal, the filter body is basically reversed with medium and high pressure pulse airflow. Blowing mode, this type of back blowing, because the back blowing pressure is higher, the back blowing pressure is basically greater than 0.1MPA, the airflow forms a high-speed airflow on the filter surface, leaving a small amount of ultrafine powder in the filter layer, which is instantly squeezed into large particles , Some of the larger particles stay in the filter layer and cannot be sucked out or blown out of the filter wall layer for a second time. After long-term high-pressure back-blowing, the larger particles stay too much, the back pressure of the filter body increases, and the load of the fan increases , The power rises, and finally the filter body must be replaced as a result of failure. In addition, because the above-mentioned filter body is not an elastic body, the repeated high-speed impact and vibration of the filter body by the high-pressure back blow can easily lead to fatigue of the filter body, and it is also a key factor that shortens the service life of the filter body.

Summary of the invention

In view of the above-mentioned problems caused by the high-pressure pulse airflow mode in the treatment of high-temperature exhaust gas containing dust in the prior art, the present invention provides a dust removal method that adopts the principle of low-pressure back-blowing breathing method and uses high-temperature wall-flow ceramic membrane filter components for dust removal. equipment.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

The first aspect of this application provides a high-temperature wall-flow ceramic membrane filtration and low-pressure back-blowing breathing method dust removal equipment, including: a box, a funnel, a smoke exhaust pipe and a back-blowing pipe; wherein,

The box body includes an upper box body and a lower box body divided into a layered partition; the upper box body is divided into at least two sealed cavities by a horizontal box plate and/or a vertical box plate , Each cavity is provided with at least one filter body assembly with a ceramic membrane filter element inside, the upper end of each filter body assembly is communicated with the cavity, and the lower end is located in the lower box;

The funnel is fixed on the support body, and its upper end opening is communicated with the lower end of the lower box body. The lower end of the funnel is provided with a dust exhaust valve; one side of the funnel is provided with a dust-containing flue gas pipe connected interface;

The smoke exhaust pipe and the reverse blowing pipe are respectively arranged on the side of each cavity, the smoke exhaust pipe is connected with the exhaust fan, and the reverse blowing pipe is connected with the reverse blower.

Preferably, each smoke exhaust pipe is equipped with a smoke exhaust valve, and each blowback pipe is equipped with a blowback valve.

More preferably, the smoke exhaust valve and the blowback valve of each cavity are alternately opened and closed.

More preferably, all the blowback pipes are connected with the blowback branch pipes after being connected by the blowback valve, the blowback branch pipes are connected to the blowback main pipe after being connected, and the blowback main pipe is connected with the blowback blower.

More preferably, all the smoke exhaust pipes are connected to the smoke exhaust branch pipes after being connected by the smoke exhaust valve, the smoke exhaust branch pipes are connected to the smoke exhaust main pipe after being connected, and the smoke exhaust main pipe is connected to the exhaust fan.

More preferably, the smoke exhaust valve and the blowback valve include, but are not limited to, a butterfly valve or a ball valve, all of which are pneumatic or electric.

More preferably, the dust removal equipment further includes an automatic control system that is connected to the smoke exhaust valve and the back blow valve and controls the switching of the smoke exhaust valve and the back blow valve.

Preferably, a mounting hole for the ceramic membrane filter element to penetrate is opened on the layer partition.

More preferably, the upper end of the filter body assembly passes through the installation hole on the layer partition and extends into the cavity, and the edge of the upper end is fixed on the layer partition by a screw.

Preferably, the filter body assembly includes: a basket fixed on the layer partition, and a ceramic membrane filter element arranged in the basket.

More preferably, the basket includes a box body with a hole and a bearing bottom frame located below it, a hole is provided in the middle of the bearing bottom frame, and the inner diameter of the hole is smaller than the cross-sectional outer diameter of the ceramic membrane filter element, The carrying bottom frame is provided with a carrying area for carrying the bottom edge of the ceramic membrane filter element. The carrying area is located on the surface of the carrying bottom frame facing the box body and extending from the edge of the hole to the edge of the carrying bottom frame. Area; the ceramic membrane filter element is inserted in the hole of the box body, and the bottom edge of the ceramic membrane filter element abuts against the carrying area.

Further, the inner diameter of the hole of the supporting bottom frame is smaller than the cross-sectional outer diameter of the ceramic membrane filter element by 10 mm.

Further, the supporting bottom frame is fixedly connected to the bottom of the box body through a connecting pillar.

Furthermore, the load-bearing bottom frame is provided with four corners, and each corner is fixedly connected to the bottom of the box body through a connecting pillar.

Further, an upper suspension plate extends outward from the top side wall of the box body, and the upper suspension plate is fixedly connected to the layer partition by a screw.

Furthermore, a sealing gasket is provided between the upper suspension plate and the layer partition; preferably, the sealing gasket is made of a sealing material with high temperature resistance and compressibility, for example, ceramic fiber paper, ceramic fiber Blanket or ceramic fiber board.

Furthermore, a high temperature resistant flexible substrate is filled between the box body and the ceramic membrane filter element, and the upper surface of the high temperature resistant flexible substrate is sealed by a compression frame, which is pressed into the inner wall of the box body and The area between the outer walls of the ceramic membrane filter element; a pressure plate extends outward from the side wall of the compression frame, and the pressure plate is fixedly connected to the upper suspension plate by bolts.

Further, the area where the bottom of the ceramic membrane filter element abuts against the supporting bottom frame is provided with a buffer layer that buffers and protects the lower end surface of the ceramic membrane filter element; preferably, the buffer layer is made of a high temperature resistant flexible material.

Further, the periphery of the supporting bottom frame is provided with a side frame, and the area enclosed by the outer wall of the bottom of the ceramic membrane filter element and the side frame is filled with a protective filler; preferably, the protective filler is a high temperature resistant flexible Substrate.

Preferably, the ceramic membrane filter element is provided with filter holes, the two ends of the filter holes are opened and closed alternately, and the closed end is closed with a plug.

More preferably, adjacent filter holes are separated by a filter medium, and one end of each filter hole is closed and the other end is open.

Further, the filter hole includes a first filter hole whose open end is located at one end of the filter body assembly, and a second filter hole whose closed end is located at one end of the filter body assembly. The first filter hole and the second filter hole Alternate arrangement.

More preferably, the through porosity of the ceramic membrane filter element is >40%, the wall thickness is <2mm, the monomer initial back pressure is <300PA, and the filter pore diameter is <5um.

In the above-mentioned filter assembly, the materials used for the box, upper suspension plate, compression frame, and pressure plate can be selected from stainless steel materials such as Q235 and 304, 310S, 316L, etc. according to the operating temperature of the dust removal equipment.

Preferably, six filter body assemblies are arranged in each cavity.

Preferably, a manual observation hole is also provided on the funnel.

Preferably, the lower box body is arranged on the machine base, and the machine base is arranged on the support body.

The second aspect of the present application provides a dust removal and filtration method, which adopts the above-mentioned high-temperature wall-flow ceramic membrane filtration and low-pressure back-blowing respiration dust removal equipment, and the method includes:

Control the filter assembly of the first cavity to be isolated from the exhaust fan and communicate with the reverse blower, stop the flue gas filtration, and perform the reverse blowing regeneration treatment. At the same time, the filter components of the other chambers are connected to the exhaust fan and are isolated from the reverse blower. Perform flue gas filtration;

After the filter assembly of the first cavity is blown back and regeneration treatment is completed, control the filter assembly of the first cavity to communicate with the exhaust fan and isolate it from the blower, and at the same time replace the filter assembly of the second cavity to repeat the first The entire process of the filter assembly of each cavity until each cavity in the upper box has completed the back-blowing regeneration treatment, and the entire high-temperature wall-flow ceramic membrane filtration and low-pressure back-blowing breathing dust removal equipment completes a cycle of dust removal and filtration.

Preferably, the high-temperature wall-flow ceramic membrane filter and low-pressure backflushing breathing method dust removal equipment is divided into four chambers by the horizontal box plate and the vertical box plate, which are respectively the first chamber, the second chamber, and the second chamber in counterclockwise order. In the third cavity and the fourth cavity, a smoke exhaust valve is installed on the exhaust pipe of each cavity, and a blowback valve is installed on the blowback pipe of each cavity; the method includes:

Close all the blowback valves, open the exhaust valve connected to the side of the second chamber to the fourth chamber, and then turn on the exhaust fan for exhausting smoke. The frequency of the exhaust fan is adjusted to meet the exhaust requirements. The second chamber The filter body assembly in the fourth cavity filters the flue gas;

When the frequency of the exhaust fan rises to the preset threshold, start the reverse blower;

Open the smoke exhaust valve of the first chamber, the first chamber performs smoke filtering, at the same time, close the smoke exhaust valve of the second chamber, open the blowback valve of the second chamber, and perform processing on the filter assembly in the second chamber. Back blow regeneration treatment;

The filter body component of the second cavity is blown back and the regeneration process is finished. Close the blowback valve of the second cavity, open the smoke exhaust valve of the second cavity, and close the smoke exhaust valve of the third cavity at the same time, open the third cavity The back-blowing valve in the third cavity performs back-blowing regeneration treatment on the filter body assembly in the third cavity;

The filter body component of the third cavity has been blown back and the regeneration process is complete. The blowback valve of the third cavity is closed, the exhaust valve of the third cavity is opened, and the exhaust valve of the fourth cavity is closed at the same time, and the fourth cavity is opened. The back-blowing valve in the fourth chamber performs back-blowing regeneration treatment on the filter body assembly in the fourth cavity;

The filter body component of the fourth cavity has been blown back and the regeneration process is completed. The blowback valve of the fourth cavity is closed, the smoke exhaust valve of the fourth cavity is opened, and the smoke exhaust valve of the first cavity is closed at the same time, and the first cavity is opened. The back-blowing valve is used to perform back-blowing regeneration treatment on the filter body assembly in the first cavity;

The filter body component of the first cavity has been blown back and the regeneration process is completed. The blowback valve and blower of the first cavity are closed, and the frequency of the exhaust fan decreases. The frequency of the exhaust fan rises to the preset threshold in the next stage. The above steps.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The present invention divides the upper box connected with the blowback pipe and the smoke exhaust pipe into a plurality of mutually sealed cavities, fixes several filter components in each cavity, and connects the smoke exhaust pipe on the side of each cavity And blowback pipes are executed by the automatic control system. You only need to set the parameter values of all working conditions. There is always a cavity as a backup to ensure that the system can achieve online filtration and low-pressure breathing back-blowing cleaning, and it will not be in the ceramic membrane filter element. The formed particles stay on the ceramic membrane filter element, the back pressure of the ceramic membrane filter element is small, the fan load is small, the power consumption is small, and it is not easy to cause the fatigue of the ceramic membrane filter element, which can improve the service life of the ceramic membrane filter element.

Description of the drawings

The drawings constituting a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation of the application. In the attached picture:

Figure 1 is a schematic diagram of the front view of the present invention;

Figure 2 is a schematic diagram of the A-direction structure of Figure 1;

Figure 3 is a schematic sectional view of the sock of the present invention;

Fig. 4 is a schematic cross-sectional view of C-C in Fig. 3;

Figure 5 is a schematic diagram of a partial cross-sectional view of D-D in Figure 3;

Figure 6 is a schematic sectional view of the filter assembly of the present invention;

Figure 7 is a schematic cross-sectional view of E-E in Figure 6;

Fig. 8 is a schematic partial cross-sectional view of F-F in Fig. 6.

illustration:

1. Funnel; 2. Dust-containing flue gas pipe; 3. Support body; 4. Machine base; 5. Lower box; 6. Ceramic membrane filter element; 7. Layer partition; 8. Filter body assembly; 9. Reverse blower; 10. Back blow branch pipe; 11. Smoke exhaust branch pipe; 12. Back blow main pipe; 13. Smoke exhaust main pipe; 14. Reverse blower; 15. Exhaust fan; 16. Manual observation hole; 17, Dust exhaust valve; 18. Vertical divider Box plate; 19, smoke exhaust pipe; 20, upper box body; 21, 3# blowback valve; 22, third cavity; 23, fourth cavity; 24, second cavity; 25, horizontal split box plate 26. The first cavity; 27, 1# smoke exhaust valve; 28, 1# blowback valve; 29, 3# smoke exhaust valve; 30, compression frame fastening bolts; 31, compression frame; 32, blocking Head; 33, pressure plate; 34, high temperature resistant flexible substrate; 36, filter hole; 37, protective filler; 38, buffer layer; 39, bearing bottom frame; 40, upper suspension plate; 41, box body; 42, connecting pillar ; 43, 2# smoke exhaust valve; 44, 2# blowback valve; 45, 4# smoke exhaust valve; 46, 4# blowback valve; 47, sealing gasket; 48, filter body assembly screw on the layer partition .

Detailed ways

The present invention provides a high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

As shown in Figures 1 to 2, a high-temperature wall-flow ceramic membrane filtration and low-pressure backflushing breathing method dust removal equipment includes: an upper box body 20 and a lower box body 5 divided by a layer partition 7 The box plate 25 and the vertical box plate 18 divide the upper box body 20 into four cavities (in Figure 2, the upper part is the first chamber 26 and the third chamber 22 from left to right; the lower part is the second chamber from left to right. The cavity 24 and the fourth cavity 23), each cavity is provided with six filter body assemblies 8, the upper end of the filter body assembly 8 passes through the mounting holes on the layer partition 7 and communicates with the cavity above it, The lower part of the filter assembly 8 is located in the lower box 5. The lower end of the lower box body 5 is communicated with the upper end opening of the funnel 1, and the funnel 1 is fixed on the support body 3. One side of the funnel 1 is connected with a dust-containing flue gas pipe 2, a dust exhaust valve 17 is provided at the lower part of the funnel 1, and a manual observation hole 16 is also provided on the funnel 1. The lower box body 5 is supported on the machine base 4, and the machine base 4 is arranged on the support body 3.

The filter body assembly 8 includes a basket fixed on the layer partition 7 and a ceramic membrane filter element 6 arranged in the basket. Fig. 3 is a schematic sectional view of the sock of the present invention. As shown in Figure 3, the basket includes a box body 41 with a hole and a bottom bearing frame 39 located below it. The bottom bearing frame 39 is provided with four corners, and each corner is connected to each other through a connecting pillar 42. The bottom of the box body 41 is fixedly connected. As shown in Figures 4 to 6, the upper side wall of the box body 41 has an upper suspension plate 40 extending outward, and the upper suspension plate 40 is fixedly connected to the layer partition 7 through the filter body assembly mounting screw 48 on the layer partition 7. Above, a sealing gasket 47 is placed between the upper suspension plate 40 and the layer partition 7. A hole is provided in the middle of the supporting bottom frame 39, and the inner diameter of the hole is smaller than the cross-sectional outer diameter of the ceramic membrane filter element 6. The carrying bottom frame 39 is provided with a carrying area for carrying the bottom edge of the ceramic membrane filter element 6, and the carrying area is located on the surface of the carrying bottom frame 39 facing the box body 41, from the edge of the hole to the carrying bottom frame The area where the edge of 39 extends; the ceramic membrane filter element 6 passes through the hole of the box body 41, and the bottom edge of the ceramic membrane filter element 6 abuts against the carrying area.

As shown in FIG. 6, the upper part of the ceramic membrane filter element 6 and the box body 41 are filled with a high-temperature resistant flexible substrate. The upper surface of the high-temperature resistant flexible substrate is sealed by a compression frame 31, and the compression The frame 31 is pressed into the area between the inner wall of the box body 41 and the outer wall of the ceramic membrane filter element 4 to compress the high-temperature resistant flexible substrate; the side wall of the pressing frame 31 is extended with a pressing plate 33, the pressing plate 33 The upper suspension plate 40 is fixedly connected with the upper suspension plate 40 through the fastening bolt 30 of the compression frame.

The supporting bottom frame 39 is provided with a buffer layer 38, the lower end of the ceramic membrane filter element 6 is located on the buffer layer 38, the buffer layer 38 is preferably a high temperature resistant flexible material, which can buffer and protect the lower end surface of the ceramic membrane filter element 6 . The supporting bottom frame 39 is also provided with a side frame around the periphery, and the area enclosed by the outer wall of the bottom of the ceramic membrane filter element 6 and the side frame is filled with a protective filler 37, which is preferably a high temperature resistant flexible substrate .

A ceramic membrane filter element 6 is arranged in the basket, and a plurality of filter holes 36 are uniformly distributed on the ceramic membrane filter element 6, and the adjacent filter holes 36 are separated by a filter medium. The two ends of each filter hole 36 are alternately opened and closed, and the closed end is closed with a plug 32. That is, if the upper end of the filter hole 36 is closed, the lower end of the filter hole 36 is open, otherwise the upper end of the filter hole 36 is open, then the filter The lower end of the hole 36 is closed. As shown in FIG. 7, the multiple filter holes 36 located at the same end of the basket are divided into open first filter holes and closed second filter holes, and the first filter holes and the second filter holes are arranged alternately.

A smoke exhaust pipe 19 and a blowback pipe 9 are respectively arranged on the side of each cavity. Specifically, as shown in FIG. 2, the first cavity 26 is provided with 1 # exhaust valve 27 and 1# blowback valve 28, respectively, and the side of the second cavity 24 is provided with 2 # exhaust valves 43 and 2#. Reverse blow valve 44; the third cavity 22 is provided with 3 # exhaust valve 29 and 3# reverse blow valve 21; the side of the fourth cavity 23 is provided with upper 4 # exhaust valve 45 and 4# reverse blow valve 46. After all the blowback pipes 9 are connected, they are connected to the blowback branch pipe 10, the blowback branch pipe 10 is connected with the blowback main pipe 12, and the blowback main pipe 12 is connected with the blowback blower 14; after all the smoke exhaust pipes 19 are connected, they are connected with the smoke exhaust branch pipe 11. The tobacco branch pipe 11 is connected with the exhaust main pipe 13, and the exhaust main pipe 13 is connected with the exhaust fan 15.

In the present application, the high-temperature wall-flow ceramic membrane filter assembly uses a high-temperature wall-flow ceramic membrane as the filter element, and adopts a hoop process to install six filter assemblies 8 in the first to the first box of the dust removal equipment. In each cavity of the fourth cavity, the number of cavities can be made into two or more than six cavities according to the requirements of the exhaust air volume, using a reverse blower or an air storage bag similar to the reverse blower, and a cross-switching method (Breathing method) The filter assembly 8 in the cavity is purged in a reverse low pressure direction. Specific steps are as follows:

Step 1. Choose a suitable high-temperature wall-flow ceramic membrane filter element according to the requirements of high-temperature exhaust gas treatment containing dust. The filter pore diameter of the ceramic membrane filter element is <5um, the through-hole ratio is <40%, the wall thickness is <2mm, and the monomer initial back pressure is <300PA , The filtration surface area is as high as 3.5㎡ or more.

Step 2. According to the external dimensions of the high-temperature wall-flow ceramic membrane filter element, make a filter basket, and select the appropriate material for the basket according to the temperature and corrosiveness of the dust-containing high-temperature exhaust gas:

A. Non-corrosive high-temperature exhaust gas containing dust, the temperature is lower than 200 degrees, use Q235 steel, the temperature is higher than 200 degrees, use stainless steel materials.

B. Corrosive and dusty high-temperature exhaust gas. According to different corrosive media, choose corrosion-resistant stainless steel materials, such as 304, 316L, 310S, etc.

C. Make a basket.

Step 3: Assemble the filter body components:

A. Place the basket on the tooling table, and cover the bottom frame of the basket with cushioning ceramic fiber blanket or ceramic paper of appropriate thickness.

B. Put the high-temperature wall-flow ceramic membrane filter element in the basket, and each basket is placed with a ceramic membrane filter element. The bottom of the basket is a bearing frame to support the ceramic membrane filter element. Fill the lower part of the ceramic membrane filter element and the area surrounding the bottom frame with a suitable high temperature resistant flexible substrate to fix the ceramic membrane filter element. The upper part of the basket is a box body with holes. The top side wall of the box body is extended with an upper suspension plate. The ceramic membrane filter element is inserted in the hole of the box body, and the gap between the box body and the ceramic membrane filter element is filled. High temperature resistant flexible substrate for sealing.

C. Press the compression frame uniformly from the upper part to compress the high-temperature resistant flexible substrate and generate a lateral expansion force to achieve the purpose of sealing. The sidewall of the compression frame has a pressure plate extending outwards and is fastened by the compression frame Bolts fix the pressure plate on the upper suspension plate to complete the assembly of the filter body assembly.

Step 4. According to the requirement of filtering air volume, make the corresponding size of high temperature wall flow ceramic membrane filter and low pressure back blow respiration dust removal equipment main body, divide into multiple groups of cavities, each group of cavities make a set of exhaust blow back ports according to the air volume.

Step 5. Make the main steel structure of the dust collector:

A. The mounting hole corresponding to the filter assembly is opened on the layer partition in the upper box, and the smoke exhaust pipe and the blowback pipe of the size corresponding to the exhaust air volume are made from the side plate of the upper box.

B. Connect the exhaust pipe to the exhaust fan, connect the reverse blower pipe to the reverse blower or the reverse blower air bag, and install a butterfly valve or ball valve at the interface between each group of cavities and the exhaust pipe or reverse blower pipe for air extraction For switching with blowback, the valves are pneumatic or electric, which is convenient for automatic control.

C. After the main body, exhaust pipe and blower pipe are made, the blower is energized or the air storage bag is ventilated to blow the blower pipe back to prevent impurities in the blower pipe from entering the cavity after the filter assembly is installed, causing ceramic membranes The channel in the filter element is blocked.

Step 6. Install the filter assembly:

A. According to the size of the upper suspension plate of the filter body assembly, cut the sealing gasket of the appropriate size. The material of the sealing gasket is ceramic fiber paper, ceramic fiber blanket or ceramic fiber blanket board and other sealing materials with high temperature resistance and compression.

B. Arrange the sealing gasket around the mounting hole on the layer partition of the dust removal equipment, and then insert the filter assembly from the mounting hole on the layer partition, and the upper suspension plate of the box body is aligned with the screw on the layer partition Press the sealing gasket behind the hole, and fix the upper suspension plate on the layer baffle with the filter body assembly mounting screw on the layer baffle. The upper suspension plate seals off the upper and lower parts of the dust removal equipment to prevent dust from leaking into the cavity.

C. After installing the filter assembly according to the above procedure step by step, cover the upper gland of the cavity and tighten the periphery with bolts to prevent air leakage and affect the effect of air extraction and blowback.

Step 7. Connect all valve electrical appliances to the main control cabinet, and perform a test run after the linkage is correct.

Step 8. Equipment operation.

The back-blowing regeneration principle of the low-pressure back-blowing breathing method is: mainly due to the characteristics of the high-temperature wall-flow ceramic membrane. The high-temperature wall-flow ceramic membrane is a ceramic product with thin filter wall layer, large porosity, and wind passing performance. It has the advantages of good and low back pressure, but the high-pressure impact resistance is relatively poor. In the case of high-pressure impact, it is easy to cause damage to the plugging heads at both ends of the high-temperature wall-flow ceramic membrane and the fracture of the membrane core. Aiming at the characteristics of thin filter wall, large porosity, good air passing performance and low back pressure, low pressure air similar to the suction pressure (3-4KPa) is used to blow back and regenerate the filter element. Because the back blow and suction pressure are similar, If running in a cavity at the same time, most of the blowback will be sucked out by the suction end, and the blowback regeneration effect of the filter element will be seriously reduced. Therefore, a single box is designed for off-line blowback. When a single box is filtered, the blowback It does not work. The suction filter does not work when blowing back. This principle is like the human respiratory system. It does not breathe when you breathe, and it does not breathe when you breathe. This is called breathing method. Both the exhalation end (reverse blowing end) and the suction end are equipped with valve bodies for easy control. Another main function of low-pressure blowback is to avoid damage to the filter element by high-pressure pulse wind, prolong the service life of the filter element, and reduce the user's cost. Because the back-blowing is offline, there must be more than two filtering chambers to ensure that at least one or more chambers are still running during the back-blowing, and the filter is still running to ensure the continuous and stable operation of the dust removal equipment.

The present invention adopts the above-mentioned high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing breathing method dust removal equipment, dust removal and filtration can be operated online at the same time, and the working process is:

1. Check the work before starting, all valves are open and closed, and the fan is open and running normally;

2. Close all the blowback valves, open the 2# to 4# exhaust valves connected to the side of the second cavity to the fourth cavity, and then turn on the exhaust fan, and adjust the frequency of the exhaust fan to meet the exhaust requirements . The filter components in the second cavity to the fourth cavity filter the flue gas;

3. When the frequency of the exhaust fan rises to a certain value, it means that a certain amount of dust has been intercepted on the ceramic membrane filter element, and it needs to be blown back and regenerated;

4. Start the reverse blower, open the 1# exhaust valve, and the first cavity will filter the flue gas. At the same time, close the 2# exhaust valve and open the 2# blowback valve. The filter assembly in the second cavity will be blown back and regenerated. ；

5. After the back-blowing regeneration of the filter body assembly of the second chamber is complete, close the 2# back-blowing valve, open the 2# smoke exhaust valve, and close the valve 3# smoke exhaust valve at the same time, open the 3# back-blowing valve, to the third chamber The filter body components are subjected to back-blowing regeneration treatment;

6. After the back-blowing regeneration of the filter body components in the third cavity is complete, close the 3# back-blowing valve, open the 3# smoke exhaust valve, and close the valve 4# smoke exhaust valve at the same time, open the 4# back-blowing valve, Filter body components undergo back-blowing regeneration treatment;

8. After the back-blowing regeneration of the filter body assembly in the fourth cavity is completed, close the 4# back-blowing valve, open the 4# smoke exhaust valve, close the valve 1# smoke exhaust valve, and open the 1# back-blowing valve to Filter body components undergo back-blowing regeneration treatment;

9. After the back-blowing regeneration of the first chamber is completed, close the 1# back-blowing valve and the back-blower, and the frequency of the exhaust fan will decrease. After the frequency of the exhaust fan increases in the next stage, the above-mentioned procedure will be carried out when the blow-back regeneration is required;

10. The above procedures are all executed by the automatic control system. You only need to set all the working condition parameter values, and there is always a cavity as a backup to ensure the smooth operation of the system.

In summary, the present invention divides the upper box connected with the blowback pipe and the smoke exhaust pipe into several mutually sealed cavities, and fixes several filter components in each cavity on the side of each cavity. It is connected with the smoke exhaust pipe and the reverse blowing pipe. It is executed by the automatic control system. It only needs to set the parameter values of all working conditions. There is always a cavity as a backup to ensure that the system can achieve online filtration and low pressure breathing back blowing cleaning. It will form particles stay on the ceramic membrane filter element, the back pressure of the ceramic membrane filter element is small, the fan load is small, the power consumption is low, and it is not easy to cause the fatigue of the ceramic membrane filter element, which can improve the service life of the ceramic membrane filter element.

The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of the present invention should fall within the scope of the present invention.

Claims (20)

1. A high-temperature wall-flow ceramic membrane filtration and low-pressure back-blowing breathing method dust removal equipment, which is characterized by comprising: a box, a funnel, a smoke exhaust pipe and a back-blowing pipe; wherein,

   The box body includes an upper box body and a lower box body divided into a layered partition; the upper box body is divided into at least two sealed cavities by a horizontal box plate and/or a vertical box plate , Each cavity is provided with at least one filter body assembly with a ceramic membrane filter element inside, the upper end of each filter body assembly is communicated with the cavity, and the lower end is located in the lower box;

   The funnel is fixed on the support body, and its upper end opening is communicated with the lower end of the lower box body. The lower end of the funnel is provided with a dust exhaust valve; one side of the funnel is provided with a dust-containing flue gas pipe connected interface;

   The smoke exhaust pipe and the reverse blowing pipe are respectively arranged on the side of each cavity, the smoke exhaust pipe is connected with the exhaust fan, and the reverse blowing pipe is connected with the reverse blower.
2. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing breathing method dust removal equipment according to claim 1, characterized in that: each smoke exhaust pipe is equipped with a smoke exhaust valve, and each blow-back pipe is equipped with a back blow valve.
3. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 2, characterized in that: the exhaust valve and back-blowing valve of each cavity are alternately opened and closed.
4. The high-temperature wall-flow ceramic membrane filter and low-pressure blowback breathing method dust removal equipment according to claim 2, characterized in that: all blowback pipes are connected through blowback valves and then connected to the blowback branch pipes, and the blowback branch pipes are connected Then it is connected with the blowback main pipe, which is connected with the blowback blower.
5. The high-temperature wall-flow ceramic membrane filter and low-pressure backflushing breathing method dust removal equipment according to claim 2, characterized in that: all the smoke exhaust pipes are connected through the smoke exhaust valve and then connected to the smoke exhaust branch pipe, and the smoke exhaust branch pipe is connected It is connected to the exhaust main pipe, which is connected to the exhaust fan.
6. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 1, characterized in that: the layer partition is provided with mounting holes for the ceramic membrane filter element to pass through.
7. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 1, wherein the filter body assembly includes a basket fixed on the layer partition, and a Ceramic membrane filter element in the basket.
8. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration method dust removal equipment according to claim 7, characterized in that: the basket includes a box with holes and a bearing bottom frame below it, and the bearing The middle of the bottom frame is provided with a hole, the inner diameter of the hole is smaller than the cross-sectional outer diameter of the ceramic membrane filter element, the carrying bottom frame is provided with a carrying area carrying the bottom edge of the ceramic membrane filter element, and the carrying area is located in the carrying The bottom frame faces the area on the surface of the box body extending from the edge of the hole to the edge of the supporting bottom frame; the ceramic membrane filter element is inserted into the hole of the box body, and the bottom edge of the ceramic membrane filter element abuts Connect to the carrying area.
9. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 8, wherein the supporting bottom frame is fixedly connected to the bottom of the box body through a connecting pillar.
10. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 8, characterized in that: the top side wall of the box body extends outwardly with an upper suspension plate through which the upper suspension plate passes The screw is fixedly connected to the layer partition.
11. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 10, wherein a sealing gasket is provided between the upper suspension plate and the layer partition.
12. The high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing respiration dust removal equipment according to claim 10, characterized in that: a high-temperature resistant flexible substrate is filled between the box body and the ceramic membrane filter element, which is resistant to high temperature The upper surface of the flexible substrate is sealed by a compression frame which is pressed into the area between the inner wall of the box body and the outer wall of the ceramic membrane filter element; the side wall of the compression frame is extended with a pressure plate, the The pressure plate is fixedly connected with the upper suspension plate by bolts.
13. The high-temperature wall-flow ceramic membrane filter and low-pressure backflush breathing method dust removal equipment according to claim 8, wherein the area where the bottom of the ceramic membrane filter element abuts the carrier bottom frame is provided with a pair of ceramic membrane filter elements. The lower end surface acts as a buffer layer for buffer protection.
14. A high-temperature wall-flow ceramic membrane filter and low-pressure backflushing breathing method dust removal equipment according to claim 8, characterized in that: the periphery of the supporting bottom frame is provided with a side frame, and the outer wall of the bottom of the ceramic membrane filter element is connected to The area enclosed by the side frame is filled with protective filler.
15. The high-temperature wall-flow ceramic membrane filtration and low-pressure backflushing breathing method dust removal equipment according to claim 1, wherein the ceramic membrane filter element is provided with filter holes, and both ends of the filter holes are opened and closed alternately , The closed end is closed with a plug.
16. The high-temperature wall-flow ceramic membrane filter and low-pressure backflush breathing method dust removal equipment according to claim 15, characterized in that: adjacent filter holes are separated by a filter medium, one end of each filter hole is closed, and the other end Wide open.
17. The high-temperature wall-flow ceramic membrane filtration and low-pressure back-blowing respiration dust removal equipment according to claim 16, wherein the filter hole includes a first filter hole with an open end located at one end of the filter body assembly, and a closed end The second filter holes are located at one end of the filter body assembly, and the first filter holes and the second filter holes are arranged alternately.
18. A high-temperature wall-flow ceramic membrane filter and low-pressure back-blowing breathing method dust removal equipment according to claim 15, characterized in that: the ceramic membrane filter element has a through porosity> 40%, a wall thickness <2 mm, and a monomer initial back Pressure <300PA, filter pore diameter <5um.
19. A method of dust removal and filtration, characterized in that the method uses the high-temperature wall-flow ceramic membrane filtration low-pressure back-blowing respiration dust removal equipment according to any one of claims 1-18, and the method comprises:

    Control the filter assembly of the first cavity to be isolated from the exhaust fan and communicate with the reverse blower, stop the flue gas filtration, and perform the reverse blowing regeneration treatment. At the same time, the filter components of the other chambers are connected to the exhaust fan and are isolated from the reverse blower. Perform flue gas filtration;

    After the filter assembly of the first cavity is blown back and regeneration treatment is completed, control the filter assembly of the first cavity to communicate with the exhaust fan and isolate it from the blower, and at the same time replace the filter assembly of the second cavity to repeat the first The entire process of the filter assembly of each cavity until each cavity in the upper box has completed the back-blowing regeneration treatment, and the entire high-temperature wall-flow ceramic membrane filtration and low-pressure back-blowing breathing dust removal equipment completes a cycle of dust removal and filtration.
20. The dust removal and filtration method according to claim 19, wherein the high-temperature wall-flow ceramic membrane filter low-pressure back-blowing breathing method dust removal equipment is divided into four chambers by a horizontal box plate and a vertical box plate , In a counterclockwise order, respectively, the first cavity, the second cavity, the third cavity and the fourth cavity. The exhaust pipe of each cavity is equipped with a smoke exhaust valve, and the reverse blow pipe of each cavity A blowback valve is installed on both; the method includes:

    Close all the blowback valves, open the exhaust valve connected to the side of the second chamber to the fourth chamber, and then turn on the exhaust fan for exhausting smoke. The frequency of the exhaust fan is adjusted to meet the exhaust requirements. The second chamber The filter body assembly in the fourth cavity filters the flue gas;

    When the frequency of the exhaust fan rises to the preset threshold, start the reverse blower;

    Open the smoke exhaust valve of the first chamber, the first chamber performs smoke filtering, at the same time, close the smoke exhaust valve of the second chamber, open the blowback valve of the second chamber, and perform processing on the filter assembly in the second chamber. Back blow regeneration treatment;

    The filter body component of the second cavity is blown back and the regeneration process is finished. Close the blowback valve of the second cavity, open the smoke exhaust valve of the second cavity, and close the smoke exhaust valve of the third cavity at the same time, open the third cavity The back-blowing valve in the third cavity performs back-blowing regeneration treatment on the filter body assembly in the third cavity;

    The filter body component of the third cavity has been blown back and the regeneration process is complete. The blowback valve of the third cavity is closed, the exhaust valve of the third cavity is opened, and the exhaust valve of the fourth cavity is closed at the same time, and the fourth cavity is opened. The back-blowing valve in the fourth chamber performs back-blowing regeneration treatment on the filter body assembly in the fourth cavity;

    The filter body component of the fourth cavity has been blown back and the regeneration process is completed. The blowback valve of the fourth cavity is closed, the smoke exhaust valve of the fourth cavity is opened, and the smoke exhaust valve of the first cavity is closed at the same time, and the first cavity is opened. The back-blowing valve is used to perform back-blowing regeneration treatment on the filter body assembly in the first cavity;

    The filter body component of the first cavity has been blown back and the regeneration process is completed. The blowback valve and blower of the first cavity are closed, and the frequency of the exhaust fan decreases. The frequency of the exhaust fan rises to the preset threshold in the next stage. The above steps.

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