Automatic ash removal system and method for carbon calcination flue gas SCR denitration catalyst

Abstract

Disclosed is an automatic ash removal system and method for carbon calcination flue gas SCR denitration catalyst, wherein catalyst gaps exist between adjacent SCR denitration catalysts and between the SCR denitration catalyst and the shell; a plurality of filter screen covers are arranged on the plurality of SCR denitration catalysts to filter carbon calcination flue gas from a flue gas inlet; the top end of the filter screen is connected to a connecting rod via a movable pin shaft, and the filter screen is arranged obliquely; a blocking plate cover is arranged in the catalyst gap, and the blocking plate is connected to the bottom end of the filter screen via a movable pin shaft; the blocking plate and the filter screen constitute a movable adjustment mechanism; the movable adjustment mechanism is raised by rotating the connecting rod, the blocking plate opens the catalyst gap, and the inclination angle of the top surface of the filter screen and the SCR denitration catalyst increases; under the double actions of the blowing operation and the open catalyst gap, the dust passes through the catalyst gap to be discharged from the flue gas outlet, and the system improves the dust blocking and cleaning effect of the filter screen.

Description

Technical Field

[0001] This invention relates to the field of carbon calcination flue gas emission treatment technology, and in particular to an automatic ash removal system and method for SCR denitrification catalyst in carbon calcination flue gas. Background Technology

[0002] In the calcination section of aluminum anode production, NO is emitted from the raw flue gas. x Content at 200mg / m 3 The levels are around [number], exceeding industry and local environmental protection standards, necessitating flue gas denitrification treatment according to environmental requirements. Using only SNCR at the high-temperature section of the calciner outlet for denitrification is insufficient due to process efficiency limitations, failing to fully meet emission standards and ensure stable operation. To ensure NO [missing information - likely related to emissions standards]... x To achieve ideal and stable emissions, a two-stage SNCR+SCR denitrification method is used, based on the calcination flue gas temperature and actual NO₂ levels. x The content of NO is effectively controlled. Due to the high sulfur content in the flue gas, the presence of some fly ash components, and the formation of ammonium bisulfate during the denitrification process, the filter screen on the surface of the SCR denitrification catalyst becomes severely and frequently clogged with ash, thus affecting the catalyst's operation and performance, leading to NO emissions. x Excessive emissions and increased load on the denitrification system create a vicious cycle of ammonia escape, severe ammonium bisulfate buildup, and instability in equipment and system operation.

[0003] In summary, although existing technologies employ sonic soot blowing for targeted solutions, they cannot meet the cleaning requirements or effectively alleviate ash accumulation and blockage. They also have drawbacks such as direct damage to the catalyst when using shock wave soot blowers, high energy consumption and catalyst failure when using steam soot blowers, leading to increased flue gas resistance, high operating costs for denitrification, and forced shutdown of manual mechanical cleaning.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic ash removal system and method for SCR denitrification catalyst in carbon calcination flue gas. This system realizes the composition of carbon calcination flue gas, the arrangement position and temperature range of SCR catalyst in the SNCR+SCR two-stage denitrification method, the current status of ash accumulation, and sonic soot blowing and shock wave direct soot blowing. It overcomes the defects in actual operation, such as ash accumulation and blockage, resulting in low overall operational stability, increased ammonia escape due to increased ammonia injection after blockage, serious ammonium bisulfate, and a vicious cycle that affects the stable operation of the equipment system.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The application discloses an automatic soot cleaning system of a carbon calcination flue gas SCR denitration catalyst.

[0008] A shell with a flue gas inlet for introducing carbon calcination flue gas and a flue gas outlet after desulfurization;

[0009] A plurality of SCR denitration catalysts are arranged in a horizontal array in the shell and located between the flue gas inlet and the flue gas outlet, and catalyst gaps exist between adjacent SCR denitration catalysts;

[0010] A lifting screen device comprises,

[0011] An execution motor,

[0012] A first rotating shaft is drivingly connected to the execution motor, the first rotating shaft extends horizontally and is rotatably supported via a bearing,

[0013] A first connecting rod is vertically connected to the first rotating shaft to follow the rotation of the first rotating shaft,

[0014] A connecting rod is vertically connected to the first connecting rod and remains horizontal, and the connecting rod follows the rotation of the first connecting rod,

[0015] A plurality of screens are arranged on the plurality of SCR denitration catalysts to filter the carbon calcination flue gas from the flue gas inlet, the top end of the screen is connected to the connecting rod via a movable pin shaft, and the screen is arranged obliquely,

[0016] A blocking plate is arranged on the catalyst gap, the blocking plate is connected to the bottom end of the screen via a movable pin shaft, and the blocking plate and the screen constitute a movable adjustment mechanism;

[0017] A shock wave soot blowing device comprises a blowing pipe towards the screen to controllably spray sound waves for soot blowing towards the screen;

[0018] A catalyst pre-post pressure difference monitoring device comprises,

[0019] A front negative pressure monitoring unit is arranged above the SCR denitration catalyst to measure front negative pressure data before catalysis,

[0020] A rear negative pressure monitoring unit is arranged below the SCR denitration catalyst to measure rear negative pressure data after catalysis,

[0021] In response to the front negative pressure data and the rear negative pressure data, the catalyst pre-post pressure difference monitoring device generates pressure difference data;

[0022] A control system is connected to the shock wave soot blowing device, the execution motor and the catalyst pre-post pressure difference monitoring device,

[0023] In response to the pressure difference data, the control system determines that the filter screen ash deposition state is out of the predetermined range, sends a soot blowing signal to the shock wave soot blowing device to perform soot blowing operation, and sends a lifting signal to the execution motor. The movable adjusting mechanism rises with the rotation of the connecting rod, the blocking plate opens the catalyst gap, and the inclination angle of the top surface of the filter screen and the SCR denitration catalyst increases. The dust is discharged through the catalyst gap under the double action of soot blowing operation and the open catalyst gap to the flue gas outlet.

[0024] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, in response to the pressure difference data, the control system determines that the filter screen ash deposition state is within the predetermined range, sends a stop blowing signal to the shock wave soot blowing device to stop soot blowing operation, and sends a lowering signal to the execution motor. The movable adjusting mechanism descends with the rotation of the connecting rod, the inclination angle of the top surface of the filter screen and the SCR denitration catalyst decreases, and the blocking plate closes the catalyst gap.

[0025] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, the size of the sound wave is positively correlated with the size of the pressure difference data.

[0026] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, the inclination angle of the top of the filter screen and the SCR denitration catalyst is positively correlated with the size of the pressure difference data.

[0027] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, the angle of the sound wave emitted by the shock wave soot blowing device is based on the inclination angle of the top surface of the filter screen and the SCR denitration catalyst.

[0028] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, two filter screens forming a herringbone structure are provided on a single SCR denitration catalyst.

[0029] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, the top surface of the SCR denitration catalyst and the filter screen thereon form a triangular structure.

[0030] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, the inclination angle of the filter screen relative to the top surface of the SCR denitration catalyst ranges from 20° to 80°.

[0031] In the automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst, the control system includes a PLC or DCS system.

[0032] A working method of an automatic soot blowing system for carbon calcination flue gas SCR denitration catalyst includes the following steps,

[0033] The front negative pressure monitoring unit measures the front negative pressure data before catalysis, the rear negative pressure monitoring unit measures the rear negative pressure data after catalysis of the SCR denitration catalyst, and the catalyst front and rear pressure difference monitoring device generates pressure difference data in response to the front negative pressure data and the rear negative pressure data;

[0034] In response to the pressure difference data, the control system judges that the filter screen ash deposition state is out of the predetermined range, sends a soot blowing signal to the shock wave soot blowing device to perform soot blowing operation, and sends a lifting signal to the execution motor, wherein the shock wave soot blowing device sprays sound waves of a predetermined size and a predetermined angle towards the filter screen according to the soot blowing signal, the movable adjusting mechanism is raised with the connecting rod rotating, the blocking plate opens the catalyst gap and the inclination angle of the top surface of the filter screen and the SCR denitration catalyst is increased to a predetermined angle, and the dust is discharged through the catalyst gap to the flue gas outlet under the double effects of soot blowing operation and the through flow of the opened catalyst gap;

[0035] In response to the pressure difference data, the control system judges that the filter screen ash deposition state is within the predetermined range, sends a stop blowing signal to the shock wave soot blowing device to stop soot blowing operation, and sends a lowering signal to the execution motor, wherein the movable adjusting mechanism is lowered with the connecting rod rotating, the inclination angle of the top surface of the filter screen and the SCR denitration catalyst is reduced, and the blocking plate closes the catalyst gap.

[0036] In the above technical solution, the carbon calcination flue gas SCR denitration catalyst automatic soot removal system provided by the present application has the following beneficial effects: compared with the prior art, the present application is automatically executed, only the running monitoring personnel needs to monitor the data and the running condition, effectively reduces the SCR denitration catalyst and surface filter screen ash deposition and denitration effect caused by flue gas ash deposition in the calcination process, improves the continuous operation stability of the waste heat boiler and the environmental protection system, effectively alleviates the vicious cycle caused by the increase of the system resistance and the deterioration of the catalyst operation effect caused by the SCR filter screen blockage, the increase of the denitration ammonia water consumption, the increase of the ammonia escape, the generation of ammonium bisulfate in flue gas, and the further adhesion and blockage of the subsequent heat exchanger tube wall, improves the operation efficiency of the waste heat boiler and the environmental protection system, and reduces the frequency of shutdown and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0038] Fig. 1 The structure schematic diagram of the soot blowing working state of the carbon calcination flue gas SCR denitration catalyst automatic soot removal system provided by the present application is shown.

[0039] Fig. 2A structure schematic diagram of the automatic dust cleaning system of the carbon calcination flue gas SCR denitration catalyst in a normal state is provided for the embodiment of the present application.

[0040] Fig. 3 A structure schematic diagram of the lifting type filter screen device of the automatic dust cleaning system of the carbon calcination flue gas SCR denitration catalyst is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0043] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0044] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, the terms first, second, etc. are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with first, second, etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of multiple is two or more, unless otherwise specifically limited.

[0046] In the present application, unless specifically defined and limited otherwise, the terms installation, connection, link, fixation and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless specifically defined and limited otherwise, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0049] Referring to Figs. 1-3 As shown in the drawings, in one embodiment, an automatic ash removal system for a carbon calcination flue gas SCR denitration catalyst of the present application comprises,

[0050] A housing 7 has a flue gas inlet 8 for introducing carbon calcination flue gas and a flue gas outlet 9 for flue gas after desulfurization;

[0051] A plurality of SCR denitration catalysts 2 are arranged in a transverse array in the housing 7 and located between the flue gas inlet 8 and the flue gas outlet 9, and there is a catalyst gap 10 between adjacent SCR denitration catalysts 2;

[0052] A lifting screen device 3 comprises,

[0053] An execution motor 11,

[0054] A first rotating shaft 12 is drivingly connected to the execution motor 11, the first rotating shaft 12 extends horizontally and is rotatably supported via a bearing 6,

[0055] A first connecting rod 13 is vertically connected to the first rotating shaft 12 to follow the rotation of the first rotating shaft 12,

[0056] A connecting rod 14 is vertically connected to the first connecting rod 13 and remains horizontal, the connecting rod 14 follows the rotation of the first connecting rod 13,

[0057] a plurality of filter screens 15, which are arranged above the plurality of SCR De-NOx catalysts 2 to filter the carbon calcination flue gas from the flue gas inlet 8, the top ends of the filter screens 15 are connected to the connecting rods 14 via the movable pin shafts 16 and the filter screens 15 are arranged obliquely,

[0058] a plurality of blocking plates 17, which are arranged in the catalyst gaps 10, the bottom ends of the blocking plates 17 are connected to the filter screens 15 via the movable pin shafts 16, and the filter screens 15 and the blocking plates 17 constitute a movable adjustment mechanism;

[0059] a shock wave soot blowing device 1, which comprises a blowing pipe directed towards the filter screens 15 to controllably spray sound waves for soot blowing towards the filter screens 15;

[0060] a catalyst pre-post pressure difference monitoring device 4, which comprises,

[0061] a front negative pressure monitoring unit 18, which is arranged above the SCR De-NOx catalysts 2 to measure the front negative pressure data before catalysis,

[0062] a rear negative pressure monitoring unit 19, which is arranged below the SCR De-NOx catalysts 2 to measure the rear negative pressure data after catalysis,

[0063] in response to the front negative pressure data and the rear negative pressure data, the catalyst pre-post pressure difference monitoring device 4 generates pressure difference data;

[0064] a control system 5, which is connected to the shock wave soot blowing device 1, the execution motor 11 and the catalyst pre-post pressure difference monitoring device 4,

[0065] in response to the pressure difference data, the control system 5 determines that the soot accumulation state of the filter screens 15 exceeds a predetermined range, sends a soot blowing signal to the shock wave soot blowing device 1 to perform a soot blowing operation, and sends a lifting signal to the execution motor 11, the movable adjustment mechanism is lifted along with the rotation of the connecting rods 14, the blocking plates 17 open the catalyst gaps 10 and the inclination angle of the top surface of the filter screens 15 and the SCR De-NOx catalysts 2 is increased, and the dust is discharged through the catalyst gaps 10 under the double effects of the soot blowing operation and the flow through the opened catalyst gaps 10 to the flue gas outlet 9.

[0066] in the preferred embodiment of the carbon calcination flue gas SCR De-NOx catalyst automatic soot removal system, in response to the pressure difference data, the control system 5 determines that the soot accumulation state of the filter screens 15 returns to within the predetermined range, sends a stop blowing signal to the shock wave soot blowing device 1 to stop the soot blowing operation, and sends a lowering signal to the execution motor 11, the movable adjustment mechanism is lowered along with the rotation of the connecting rods 14, the inclination angle of the top surface of the filter screens 15 and the SCR De-NOx catalysts 2 is reduced, and the blocking plates 17 close the catalyst gaps 10.

[0067] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, the size of the sound wave is positively correlated with the size of the pressure difference data.

[0068] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, the size of the inclination angle of the filter screen 15 and the top of the SCR denitration catalyst 2 is positively correlated with the size of the pressure difference data.

[0069] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, the angle of the sound wave sprayed by the shock wave soot blowing device 1 fluctuates based on the inclination angle of the top surface of the filter screen 15 and the SCR denitration catalyst 2, and further, the angle of the sound wave sprayed by the shock wave soot blowing device 1 is the same as the inclination angle of the top surface of the filter screen 15 and the SCR denitration catalyst 2.

[0070] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, two filter screens 15 forming a herringbone structure are arranged on a single SCR denitration catalyst 2.

[0071] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, the top surface of the SCR denitration catalyst 2 and the filter screen 15 thereon form a triangular structure.

[0072] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, the inclination angle of the filter screen 15 relative to the top surface of the SCR denitration catalyst 2 ranges from 20° to 80°.

[0073] In the preferred embodiment of the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst, the control system 5 includes a PLC or a DCS system.

[0074] In one embodiment, the automatic soot cleaning system for the carbon calcination flue gas SCR denitration catalyst includes an automatically adjusted lifting filter screen device 3, a shock wave soot blowing device 1, a front-rear pressure difference monitoring device, and a control system 5. According to the catalyst front-rear pressure difference, the soot accumulation state of the filter screen 15 on the catalyst surface is determined, the working state of the lifting filter screen device 3 is adjusted, and the shock wave soot blowing system is activated to effectively clean the soot accumulated on the filter screen 15. A large amount of accumulated soot is not passed through the catalyst and does not block the catalyst, thereby improving the soot interception effect of the filter screen 15 and the cleaning effect of the soot blower, and achieving the ideal operating state of effectively treating the catalyst surface and the filter screen 15 blockage.

[0075] In one embodiment, the system monitors the catalyst pressure difference data before and after the differential pressure monitoring device according to the differential pressure, and monitors the catalyst filter screen 15 ash deposition. Since the catalyst filter screen 15 surface appears to be covered with ash, the catalyst pressure difference before and after will gradually increase. After reaching the set value, the lifting filter screen device 3 acts to raise the filter screen 15. During the raising process, the catalyst gap 10 between the catalyst and the catalyst is opened at the same time. Further, the catalyst gap 10 includes the gap between the catalyst and the furnace wall. The blocking plate 17 also includes a blocking plate for closing the gap between the catalyst and the furnace wall. At this time, due to the steep angle of the filter screen 15 and the instantaneous increase in the flow rate of the flue gas in the gap, the filter screen 15 surface ash is loosened and a large part of it is carried away in the gap. The lifting filter screen device 3 is reset, and the control system 5 monitors the catalyst pressure difference before and after the differential pressure. If the set value is not reached, the lifting filter screen device 3 is again raised, and at the same time the top shock wave soot blowing device 1 is linked to blow the filter screen 15. After the blowing is completed, the lifting filter screen device 3 is reset. During the resetting process, due to the closure of the gap between the catalyst and the catalyst and the catalyst and the furnace wall by the filter screen 15 and the blocking plate 17, the instantaneous flow rate of the catalyst flow-through part increases, and the filter screen 15 falling part of the fine dust is carried away with the flue gas, realizing the catalyst and catalyst surface filter screen 15 ash removal process, and completing the stable working condition and continuous operation.

[0076] In one embodiment, the filter screen 15 is improved on the basis of the original flat filter screen 15, the main changes and advantages are to increase the filtering flow area of the original flat filter screen 15, to change to a triangular shape to facilitate the separation of dust accumulated on the surface of the filter screen 15 during the blowing of the blowing device; an adjustable connecting pin shaft is added at the bottom of the filter screen 15 to combine the blocked steel plate with the filter screen 15 into an adjustable adjustment mechanism. During normal operation, the filter screen 15 with the blocking plate 17 plays a role in blocking the catalyst and the catalyst gap to prevent the flue gas from passing through the catalyst for treatment and absorption, and assists the blowing system during blowing to open the catalyst gap 10 between the catalysts, under the double action of the blowing device and the suddenly increased flow gap, the filter screen 15 on the surface is blown off without catalyst, and passes through the catalyst gap 10 quickly; the top of the filter screen 15 is connected by the movable pin shaft 16, which is raised as a whole when the lifting filter screen device 3 operates, the top angle of the raised filter screen 15 becomes smaller, that is, the inclination angle increases, and the size is supplemented by the blocking plate standing up from the bottom. The lifting filter screen device 3 provides power for its operation under the signal instruction of the system, which is composed of an execution motor 11 and a connecting rod 14, and is connected to the movable pin shaft 16 at the top of the filter screen 15. During blowing, the automatic adjustment of the catalyst filter screen 15 is realized. A front negative pressure monitoring unit 18 and a rear negative pressure monitoring unit 19 are arranged in front of and behind the catalyst respectively, and the blockage of the catalyst filter screen 15 is reflected according to the difference between the front and rear negative pressure monitoring values, such as: the design pressure difference is 200Kpa after cleaning, and the pressure difference will gradually increase with the continuous deposition of dust on the surface of the catalyst filter screen 15 during system operation, when it reaches a certain value, blowing is needed, the system detects the increase of the actual pressure difference, and transmits the signal to the DCS system according to the set value, and sends an instruction to start the automatically adjustable catalyst filter screen 15, the adjustment execution mechanism and the shock blowing device 1 according to the program setting.

[0077] A working method of an automatic ash removal system of a carbon calcination flue gas SCR denitration catalyst includes the following steps,

[0078] The front negative pressure monitoring unit 18 measures the front negative pressure data before the catalyst, and the rear negative pressure monitoring unit 19 measures the rear negative pressure data after the SCR denitration catalyst 2 is catalyzed, and the catalyst front and rear pressure difference monitoring device 4 generates pressure difference data in response to the front and rear negative pressure data;

[0079] In response to the pressure difference data, the control system 5 judges that the dusting state of the filter screen 15 is out of the predetermined range, sends a dust blowing signal to the shock wave dust blowing device 1 to perform a dust blowing operation, and sends a lifting signal to the execution motor 11, wherein the shock wave dust blowing device 1 sprays a sound wave of a predetermined size and a predetermined angle towards the filter screen 15 according to the dust blowing signal, the movable adjusting mechanism is lifted up with the rotation of the connecting rod 14, the blocking plate 17 opens the catalyst gap 10 and the inclination angle of the top surface of the filter screen 15 and the SCR denitration catalyst 2 is increased to a predetermined angle, and the dust is discharged through the catalyst gap 10 under the double effects of the dust blowing operation and the open catalyst gap 10 to the flue gas outlet 9.

[0080] In response to the pressure difference data, the control system 5 judges that the dusting state of the filter screen 15 is in the predetermined range, sends a stop blowing signal to the shock wave dust blowing device 1 to stop the dust blowing operation, and sends a lowering signal to the execution motor 11, wherein the movable adjusting mechanism is lowered with the rotation of the connecting rod 14, the inclination angle of the top surface of the filter screen 15 and the SCR denitration catalyst 2 is reduced, and the blocking plate 17 closes the catalyst gap 10.

[0081] Finally, it should be noted that the described embodiments are only some of the embodiments of the present application, not all the embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0082] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A carbon calcination flue gas SCR denitration catalyst automatic ash removal system, characterized in that, It comprises: a housing having a flue gas inlet for introducing carbon calcination flue gas and a flue gas outlet for flue gas after denitration; a plurality of SCR denitration catalysts arranged in a lateral array in the housing and located between the flue gas inlet and the flue gas outlet, catalyst gaps existing between adjacent SCR denitration catalysts and between the SCR denitration catalysts and the housing; a lifting screen device comprising, an execution motor, a first rotating shaft drivingly connected to the execution motor, the first rotating shaft extending horizontally and being rotatably supported via a bearing, a first connecting rod vertically connected to the first rotating shaft to follow the rotation of the first rotating shaft, a connecting rod vertically connected to the first connecting rod and kept horizontal, the connecting rod following the rotation of the first connecting rod, a plurality of screens covering the plurality of SCR denitration catalysts to filter the carbon calcination flue gas from the flue gas inlet, the top ends of the screens being connected to the connecting rod via movable pins and the screens being arranged obliquely, a blocking plate covering the catalyst gaps, the blocking plate being connected to the bottom ends of the screens via movable pins, the blocking plate and the screens constituting a movable adjustment mechanism; a shock wave soot blowing device comprising a blowing pipe towards the screens to controllably spray sound waves for soot blowing thereon; a catalyst pre-post pressure difference monitoring device comprising, a pre-negative pressure monitoring unit arranged above the SCR denitration catalysts to measure pre-catalysis pre-negative pressure data, a post-negative pressure monitoring unit arranged below the SCR denitration catalysts to measure post-catalysis post-negative pressure data, in response to the pre-negative pressure data and the post-negative pressure data, the catalyst pre-post pressure difference monitoring device generates pressure difference data; a control system connected to the shock wave soot blowing device, the execution motor and the catalyst pre-post pressure difference monitoring device, in response to the pressure difference data, the control system determines that the soot accumulation state of the screens exceeds a predetermined range, sends a soot blowing signal to the shock wave soot blowing device to perform soot blowing operation, and sends a lifting signal to the execution motor, the movable adjustment mechanism is lifted with the connecting rod rotating, the blocking plate opens the catalyst gaps and the inclination angle of the top surface of the screens and the SCR denitration catalysts increases, and the dust is discharged through the catalyst gaps to the flue gas outlet under the double effects of soot blowing operation and open catalyst gaps.

2. The automatic ash removal system of the carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, in response to the pressure difference data, the control system determines that the soot accumulation state of the screens returns to within the predetermined range, sends a stop blowing signal to the shock wave soot blowing device to stop the soot blowing operation, and sends a lowering signal to the execution motor, the movable adjustment mechanism is lowered with the connecting rod rotating, the inclination angle of the top surface of the screens and the SCR denitration catalysts decreases, and the blocking plate closes the catalyst gaps.

3. The automatic ash removal system of a carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, The size of the sound waves is positively correlated with the size of the pressure difference data.

4. The automatic ash removal system for a carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, The inclination angle of the top surface of the screens and the SCR denitration catalysts is positively correlated with the size of the pressure difference data.

5. The automatic ash removal system for carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, The angle of the sound waves sprayed by the shock wave soot blowing device fluctuates up and down based on the inclination angle of the top of the screens and the SCR denitration catalysts.

6. The automatic ash removal system for a carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, Two screens constituting a herringbone structure are arranged on a single SCR denitration catalyst.

7. The automatic ash removal system for a carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, The top surface of the SCR denitration catalyst and the screens thereon constitute a triangular structure.

8. The automatic ash removal system for a carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, The inclination angle of the filter screen relative to the top surface of the SCR denitration catalyst ranges from 20° to 80°.

9. The automatic ash removal system for a carbon calcination flue gas SCR denitration catalyst according to claim 1, characterized in that, The control system comprises a PLC or a DCS system.

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