A row-type light-burned magnesium oxide calcining system

Abstract

The present invention relates to the field of chemical smelting technology, and specifically to a row-type light-burned magnesium oxide calcining system, including crushing equipment, calcining furnace, dust removal equipment and denitration equipment; the denitration equipment includes a rotating shell and a catalytic component; a channel for flue gas flow is provided in the rotating shell; a plurality of catalytic components are provided, which are arranged in sequence along the extension direction of the channel; each catalytic component includes a catalytic plate and a guide plate arranged in sequence, and the catalytic plate is located on the air inlet side of the guide plate; the catalytic plate includes an outer ring part, an intermediate ring and a catalytic part arranged in sequence from the outside to the inside; the guide plate includes a mounting ring and an inner plate arranged in sequence from the outside to the inside and rotatably matched. A first through hole and a second through hole are respectively provided on the catalytic plate and the guide plate of each catalytic component, which are staggered from each other, and the positions of the first through hole and the second through hole at different positions of the catalytic component are changed, so that the flue gas passes through the catalytic plate in different directions when the catalytic component is in different positions, thereby improving the utilization efficiency of the catalyst in the catalytic part.

Description

Technical Field

[0001] The invention relates to the technical field of chemical smelting, and in particular to a row-type light-burned magnesium oxide calcining system. Background Art

[0002] Magnesium oxide has a wide range of uses, mainly for refractory materials. At present, the development and utilization of magnesium ore in my country is mainly used for the production of various refractory bricks. The raw material production process is relatively backward. Traditional furnaces use coal as fuel, and the black smoke emissions are very large. In the process of magnesia production, a large amount of MgO-containing dust and SO2-containing smoke are generated, which not only pollutes the atmospheric environment, but also degrades the entire ecological environment. However, the closed calcining furnace production process, combined with advanced calcining technology, produces flue gas that basically does not contain sulfur. The main pollutants treated are particulate matter and nitrogen oxides in the flue gas. After being treated by dust removal devices and denitrification devices, the flue gas can be discharged into the atmosphere after being purified, reducing pollution to the environment.

[0003] Selective catalytic reduction (SCR) denitrification technology has the advantages of simple structure, good reliability and high denitrification efficiency. It occupies 80% of the world's flue gas denitrification market and is widely used in the treatment of flue gas from calcining kilns in my country. Commonly used denitrification catalysts include flat plate, honeycomb and corrugated plate types. When in use, multiple layers of catalysts are usually set to ensure that the flue gas reacts with the catalyst to convert the nitride in the flue gas into harmless nitrogen and water. However, the catalyst plate is easily blocked by particles in the flue gas, and is easily not fully utilized due to uneven flue gas flow, and the utilization efficiency of the catalyst plate is not high. Summary of the invention

[0004] The invention provides a row-type light-burned magnesium oxide calcining system to solve the problem of low utilization efficiency of catalyst plates in flue gas denitration in the existing calcining system.

[0005] A row-type light-burned magnesium oxide calcining system of the present invention adopts the following technical scheme:

[0006] A row-type light-burned magnesium oxide calcining system comprises a crushing device, a calcining furnace, a dust removal device and a denitration device; the crushing device crushes the ore and then transports it to the calcining furnace, the calcining furnace heats the inside of the calcining furnace with natural gas to make the ore react, the calcined material is discharged from the bottom of the calcining furnace, and the separated gas enters the dust removal device through a pipeline for dust removal and then enters the denitration device for denitration; the denitration device comprises a supporting frame, a rotating shell and a catalytic component; the rotating shell is fixed to the supporting frame, and a channel for flue gas flow is opened in the rotating shell; a plurality of catalytic components are provided, all of which are arranged in the rotating shell and are arranged in sequence at intervals along the extension direction of the channel; each catalytic component comprises a catalytic plate and a guide plate arranged in intervals, the catalytic plate and the guide plate are arranged perpendicular to the extension direction of the channel, and the catalytic plate is located on the air inlet side of the guide plate; the catalytic plate comprises an outer ring portion, an intermediate ring and a catalytic portion which are arranged in sequence from the outside to the inside, and the catalytic portion is provided with A catalyst for reacting with flue gas, and the flue gas can enter between the catalyst plate and the guide plate through the catalyst part; the catalyst part is fixedly connected to the outer ring part, and the middle ring is rotatably connected to the outer ring part; a first through hole is provided on one side edge of the middle ring; the guide plate includes a mounting ring and an inner plate which are arranged in sequence from the outside to the inside and rotatably matched, and a second through hole is provided on one side edge of the inner plate; the phase angle of the first through hole and the second through hole of the same catalyst component in the circumferential direction of the guide plate is greater than 135° and less than 180°; the outer ring parts and mounting rings of multiple catalyst components move synchronously along the extension direction of the channel, and during the movement, the middle rings and inner plates of multiple catalyst components move along the same spiral path and rotate; in the process of the catalyst component moving from the initial position to the terminal position in the channel, the middle ring and the inner plate rotate at least one circle; the initial position is the placement position for replacing the new catalyst component, and the terminal position is the position for taking out the old catalyst component.

[0007] Optionally, an air inlet and an air outlet are provided on the rotary shell, and smoke enters from the air inlet and flows through the channel and is discharged from the air outlet.

[0008] Optionally, the inner wall of the rotating shell is provided with slide grooves arranged along the extension direction of the channel, and there are at least three groups of slide grooves. The outer ring part and the outer ring of the mounting ring are both slidably matched with at least three groups of slide grooves; at least three groups of slide grooves restrict the catalyst plate and the guide plate to always be perpendicular to the extension direction of the channel.

[0009] Optionally, the inner wall of the rotating shell is also provided with a plurality of spiral tracks, which are arranged at intervals around the circumference of the channel and all extend spirally along the extension direction of the channel; the outer peripheral walls of the intermediate ring and the inner plate extend outward relative to the outer ring portion and the mounting ring respectively, and the outer peripheral walls of the intermediate ring and the inner plate are provided with grooves for cooperating with the spiral tracks; the spiral tracks are disconnected at the intersection with the slide grooves, and the number of the spiral tracks is greater than the number of the slide grooves.

[0010] Optionally, the interior of the rotating shell is in a ring shape around a horizontal axis, and the upper ends of the rings are not connected to each other, so as to define a U-shaped channel in the rotating shell; the air inlet and the air outlet are respectively located on both sides of the upper end of the rotating shell; the initial position is located on the air inlet side of the channel and below the air inlet, and the end position is located on the air outlet side of the channel and below the air outlet.

[0011] Optionally, the side wall of the channel located on the inner ring of the ring is the inner ring wall, and the side wall of the channel located on the outer ring of the ring is the outer ring wall; there is at least one slide groove located on the inner wall of the rotating shell and in the middle position between the inner ring wall and the outer ring wall, and an annular transmission belt is arranged in the slide groove, and the transmission belt is connected to the outer ring parts and mounting rings of multiple catalytic components to drive the catalytic components to move along the slide groove.

[0012] Optionally, the outer ring portion and the outer ring of the mounting ring are both provided with a plurality of mounting blocks, each mounting block is correspondingly mounted in a slide groove, and at least one mounting block is detachably connected to the transmission belt in the slide groove.

[0013] Optionally, the denitrification equipment also includes a pre-treatment channel, which is fixed to the supporting frame and is used to disperse the flue gas and guide the flue gas into the air inlet from bottom to top.

[0014] Optionally, the upper end of the rotary shell is a detachable structure.

[0015] Optionally, the outer ring part, the mounting ring and the inner ring of the intermediate ring are all provided with annular grooves, the intermediate ring is rotatably mounted in the annular groove of the inner ring of the outer ring part, the inner plate is rotatably mounted in the annular groove of the inner ring of the mounting ring, and the catalytic part is rotatably matched with the annular groove of the inner ring of the intermediate ring.

[0016] The beneficial effects of the present invention are as follows: the denitrification equipment of the row-type light-burned magnesium oxide calcining system of the present invention is provided with a plurality of catalytic components, and a first through hole and a second through hole are provided on each catalytic component. The flue gas entering the rotary shell can pass through the plurality of catalytic components without a large intake pressure. Even if one of the catalytic components is blocked, the flow of the flue gas is not affected, and the flue gas can still flow in the channel to react with other catalytic components.

[0017] Furthermore, the smoke passing through the first through hole can reduce the overall nitrate content in the smoke after mixing with the smoke after the reaction, and the flow rate of the smoke passing through the first through hole is less attenuated, which can carry the smoke after the reaction and reduce the retention of the smoke.

[0018] Furthermore, by moving the intermediate ring and the mounting ring along the same spiral trajectory, the positions of the first through hole and the second through hole at different positions of the catalyst assembly are changed, so that when the catalyst assembly is in different positions, the flue gas passes through the catalyst plate in different directions, thereby improving the utilization efficiency of the catalyst in the catalyst part and making full use of it.

[0019] Furthermore, each catalytic component is initially installed at an initial position in the channel. As the usage time increases, multiple catalytic components are moved synchronously in the channel after a certain interval. When the catalytic component moves to the final position, it can be replaced and a new catalytic component can be placed at the initial position. This arrangement can ensure that the catalytic components are fully utilized in the channel, and the one taken out each time is the one with the longest usage time and the worst catalytic effect. It also ensures that the flue gas can react with the catalytic components with the best catalytic effect when it just enters the channel, thereby ensuring the denitrification effect of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a row-type light-burned magnesium oxide calcining system of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a denitration device in an embodiment of a row-type light-burned magnesium oxide calcining system of the present invention;

[0023] Figure 3 It is a cross-sectional schematic diagram of a denitration device in an embodiment of a row-type light-burned magnesium oxide calcining system of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the rotary shell in an embodiment of a row-type light-burned magnesium oxide calcining system of the present invention (only one catalytic component is shown in the figure);

[0025] Figure 5 It is a schematic structural diagram of a catalyst plate in an embodiment of a row-type light-burned magnesium oxide calcining system of the present invention;

[0026] Figure 6 The present invention is a schematic structural diagram of a guide plate in an embodiment of a row-type light-burned magnesium oxide calcining system.

[0027] In the figure: 1000, crushing equipment; 2000, calcining furnace; 3000, dust removal equipment; 4000, denitrification equipment; 100, supporting frame; 200, pre-treatment pipeline; 300, rotating shell; 310, air inlet; 320, air outlet; 330, channel; 340, slide; 350, spiral track; 400, catalytic assembly; 410, catalytic plate; 411, outer ring; 412, middle ring; 413, catalytic part; 414, first through hole; 420, guide plate; 421, mounting ring; 422, inner plate; 423, second through hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] An embodiment of a row-type light-burned magnesium oxide calcining system of the present invention is as follows: Figures 1 to 6 As shown, it includes a crushing device 1000, a calcining furnace 2000, a dust removal device 3000 and a denitrification device 4000.

[0030] The crushing equipment 1000 crushes the ore and then transports it to the calcining furnace 2000. The calcining furnace 2000 uses natural gas to heat its interior to make the ore react. The calcined material is discharged from the bottom of the calcining furnace 2000. The separated gas enters the dust removal equipment 3000 through a pipeline for dust removal and then enters the denitrification equipment 4000 for denitrification. Among them, the crushing equipment 1000 usually uses a jaw crusher. The crushed ore raw materials are sent to the calcining furnace 2000 through a belt conveyor. A variety of heat sources can be used in the calcining furnace 2000, such as natural gas, coal gas, biogas, diesel, tar, etc. for calcination, and the calcination process is carried out in the calcining furnace 2000 in a closed manner without dust leakage. The flue gas generated after calcination can be recovered through the flue gas heat exchanger for waste heat recovery, and the external combustion-supporting air can enter the calcining furnace 2000 for combustion after being heated by the flue gas heat exchanger. The cooled flue gas enters the dust removal equipment 3000 for dust removal, and then enters the denitrification equipment 4000 for denitrification. In some other embodiments, the carbon dioxide and other gases in the flue gas discharged from the denitrification equipment 4000 can be further recovered and then discharged into the atmosphere, so as to fully recycle the flue gas.

[0031] The denitration equipment 4000 includes a support frame 100, a rotating shell 300 and a catalytic assembly 400; the rotating shell 300 is fixed to the support frame 100, and a channel 330 for flue gas flow is opened in the rotating shell 300.

[0032] There are multiple catalytic assemblies 400, all of which are arranged in the rotating shell 300 and are arranged in sequence along the extension direction of the channel 330. Each catalytic assembly 400 includes a catalytic plate 410 and a guide plate 420 arranged in sequence. The catalytic plate 410 and the guide plate 420 are arranged perpendicular to the extension direction of the channel 330, and the catalytic plate 410 is located on the air intake side of the guide plate 420. The catalytic plate 410 includes an outer ring portion 411, an intermediate ring 412 and a catalytic portion 413 arranged in sequence from the outside to the inside. The catalytic portion 413 is provided with a catalyst for reacting with the flue gas, and the flue gas can enter between the catalytic plate 410 and the guide plate 420 through the catalytic portion 413; the catalytic portion 413 is fixedly connected to the outer ring portion 411, and the intermediate ring 412 is rotatably connected to the outer ring portion 411; a first through hole 414 is opened on one side edge of the intermediate ring 412. The guide plate 420 includes a mounting ring 421 and an inner plate 422 which are sequentially arranged from the outside to the inside and rotated together, and a second through hole 423 is opened on one side edge of the inner plate 422; the phase angle of the first through hole 414 and the second through hole 423 of the same catalyst component 400 in the circumferential direction of the guide plate 420 is greater than 135° and less than 180°. The outer ring parts 411 and the mounting rings 421 of multiple catalyst components 400 move synchronously along the extension direction of the channel 330, and during the movement, the middle rings 412 and the inner plate 422 of multiple catalyst components 400 move along the same spiral path and rotate; during the process of the catalyst component 400 moving from the initial position to the terminal position in the channel 330, the middle ring 412 and the inner plate 422 rotate at least one circle; the initial position is the placement position for replacing the new catalyst component 400, and the terminal position is the position for taking out the old catalyst component 400.

[0033] When in use, after the flue gas enters the rotary shell 300, it flows in the channel 330 in the direction from the initial position to the terminal position, passes through multiple catalytic components 400 in sequence, and the flue gas produces a reduction reaction with the catalyst on the catalytic part 413 to denitrify. When the flue gas passes through the catalytic plate 410 of the first catalytic component 400, part of the flue gas passes through the catalytic part 413 and reacts with the catalyst before entering between the catalytic plate 410 and the guide plate 420, and part of the flue gas enters between the catalytic plate 410 and the guide plate 420 through the first through hole 414; because the phase angle of the first through hole 414 and the second through hole 423 of the same catalytic component 400 in the circumferential direction of the guide plate 420 is greater than 135° and less than 180°, the unreacted flue gas can be fully mixed with the reacted flue gas in the process of flowing to the second through hole 423, and the mixed flue gas is discharged from the second through hole 423 on the guide plate 420, and continues to pass through the second catalytic component 400 along the above path. By providing a plurality of catalytic components 400, and opening a first through hole 414 and a second through hole 423 on each catalytic component 400, the flue gas entering the rotary shell 300 can pass through the plurality of catalytic components 400 without a large intake pressure, and even if one of the catalytic components 400 is blocked, it does not affect the flow of the flue gas, and the flue gas can still flow in the channel 330 to react with other catalytic components 400. The flue gas passing through the first through hole 414 can reduce the overall nitrate content in the flue gas after mixing with the flue gas after the reaction, and the flow velocity of the flue gas passing through the first through hole 414 is less attenuated, and can carry the flue gas after the reaction to reduce the retention of the flue gas.

[0034] Since the plurality of catalytic assemblies 400 are distributed at intervals by moving in sequence in the channel 330, and the catalytic portion 413 does not rotate during the movement, the intermediate rings 412 and the inner plates 422 of the plurality of catalytic assemblies 400 are located on the same spiral path, so that in two adjacent catalytic assemblies 400, the second through hole 423 on the guide plate 420 of the upstream catalytic assembly 400 and the first through hole 414 on the catalytic plate 410 of the downstream catalytic assembly 400 are misaligned in the circumferential direction of the guide plate 420, which makes the catalytic assembly 400 located at the upstream The path of the flue gas received by the catalytic plate 410 flowing from the top of the catalytic plate 410 to the first through hole 414 thereof is misaligned with the path of the flue gas received by the catalytic plate 410 of the downstream catalytic assembly 400 flowing from the top of the catalytic plate 410 to the first through hole 414 thereof, so that when the catalytic assembly 400 moves to different positions in the channel 330, the flue gas can flow from different positions of the catalytic plate 410 to the first through hole 414, and in this process, part of the flue gas passes through the catalytic part 413, so that the catalysts at different positions of the circumferential direction of the catalytic part 413 can be fully utilized. By moving the intermediate ring 412 and the inner plate 422 along the same spiral trajectory, the positions of the first through hole 414 and the second through hole 423 of the catalytic assembly 400 at different positions are changed, so that when the catalytic assembly 400 is at different positions, the flue gas passes through the catalytic plate 410 in different directions, thereby improving the utilization efficiency of the catalyst in the catalytic part 413 and making it fully utilized. Each catalytic component 400 is initially installed at an initial position in the channel 330. As the use time increases, multiple catalytic components 400 are synchronously moved in the channel 330 after a certain period of time. When the catalytic component 400 moves to the final position, it can be replaced and a new catalytic component 400 is placed at the initial position. This arrangement can ensure that the catalytic components 400 are fully utilized in the channel 330, and the one taken out each time is the one with the longest use time and the worst catalytic effect, and ensure that the flue gas can react with the catalytic components 400 with the best catalytic effect when it just enters the channel 330, thereby ensuring the denitrification effect of the flue gas.

[0035] In this embodiment, the rotary shell 300 is provided with an air inlet 310 and an air outlet 320, and the flue gas enters from the air inlet 310 and flows through the channel 330 and then is discharged from the air outlet 320. In some other embodiments, a fully enclosed catalyst plate may be installed at the air outlet 320 to ensure that all flue gas contacts the catalyst without omission.

[0036] In this embodiment, the inner wall of the rotary shell 300 is provided with slide grooves 340 arranged along the extension direction of the channel 330, and there are at least three groups of slide grooves 340. The outer rings of the outer ring portion 411 and the mounting ring 421 are both slidably matched with at least three groups of slide grooves 340; at least three groups of slide grooves 340 restrict the catalytic plate 410 and the guide plate 420 to always be perpendicular to the extension direction of the channel 330. Since three points determine a plane, the outer ring portion 411 and the mounting ring 421 are simultaneously slidably matched with at least three groups of slide grooves 340, which can ensure that the catalytic plate 410 and the guide plate 420 are always perpendicular to the extension direction of the channel 330.

[0037] In this embodiment, a plurality of spiral tracks 350 are further provided on the inner wall of the rotating shell 300, and the plurality of spiral tracks 350 are arranged at circumferential intervals around the channel 330 and all extend spirally along the extension direction of the channel 330; the outer peripheral walls of the intermediate ring 412 and the inner plate 422 extend outward relative to the outer ring portion 411 and the mounting ring 421 respectively, and the outer peripheral walls of the intermediate ring 412 and the inner plate 422 are provided with a slot for cooperating with the spiral track 350; the spiral track 350 is disconnected at the intersection position with the slide groove 340, and the number of the spiral tracks 350 is greater than the number of the slide grooves 340, and then when the intermediate ring 412 or the inner plate 422 moves to the intersection position of the spiral track 350 and the slide groove 340, at least one of the spiral tracks 350 remains in cooperation with the intermediate ring 412 or the inner plate 422 to prevent the intermediate ring 412 or the inner plate 422 from being disconnected from the spiral track 350.

[0038] In this embodiment, the interior of the rotating shell 300 is in a ring shape around a horizontal axis, and the upper ends of the ring shapes are not connected to each other, so as to define a U-shaped channel 330 in the rotating shell 300. The air inlet 310 and the air outlet 320 are respectively located on both sides of the upper end of the rotating shell 300, that is, they are respectively connected to the two ends of the U-shaped channel 330; the initial position is located at the air inlet side of the channel 330 and below the air inlet 310, and the terminal position is located at the air outlet side of the channel 330 and below the air outlet 320.

[0039] In this embodiment, the side wall of the channel 330 located in the inner ring of the annular shape is the inner ring wall, and the side wall located in the outer ring of the annular shape is the outer ring wall; at least one slide groove 340 is located in the inner wall of the rotary shell 300 and in the middle of the inner ring wall and the outer ring wall, and an annular transmission belt (not shown in the figure) is arranged in the slide groove 340, and the transmission belt is connected with the outer ring parts 411 and the mounting ring 421 of the plurality of catalyst components 400 to drive the catalyst components 400 to move along the slide groove 340. Specifically, the outer ring parts 411 and the outer rings of the mounting ring 421 are both provided with a plurality of mounting blocks, each mounting block is correspondingly mounted in a slide groove 340, and at least one mounting block is detachably connected with the transmission belt in the slide groove 340.

[0040] In this embodiment, the denitration equipment 4000 further includes a pre-treatment pipeline 200 , which is fixed to the support frame 100 and is used to disperse the flue gas and guide the flue gas to enter the air inlet 310 from bottom to top.

[0041] In this embodiment, the upper end of the rotary shell 300 is a detachable structure, so as to place a new catalyst assembly 400 at the initial position of the channel 330 and take out the old catalyst assembly 400 at the end position.

[0042] In this embodiment, the outer ring portion 411, the mounting ring 421 and the inner ring of the intermediate ring 412 are all provided with annular grooves, the intermediate ring 412 is rotatably mounted in the annular groove of the inner ring of the outer ring portion 411, the inner plate 422 is rotatably mounted in the annular groove of the inner ring of the mounting ring 421, and the catalytic portion 413 is rotatably matched with the annular groove of the inner ring of the intermediate ring 412.

[0043] When the row-type light-burned magnesium oxide calcining system of the present invention is used, the ore raw material is first crushed by the crushing equipment 1000, and then the crushed raw material is sent to the calcining furnace 2000 for calcination by the belt conveyor. The calcined material is discharged from the bottom of the calcining furnace 2000, and the discharge position below the calcining furnace 2000 is provided with two rotary sealing mechanisms, and the valves opened alternately ensure that the closed system in the calcining furnace 2000 is not damaged during discharge. The flue gas generated during the calcining process is recovered by the flue gas heat exchanger for waste heat recovery, and the external combustion-supporting wind can enter the calcining furnace 2000 for combustion after being heated by the flue gas heat exchanger. The flue gas after cooling enters the dust removal equipment 3000 for dust removal, and then enters the denitration equipment 4000 for denitration.

[0044] In the denitration process, the flue gas enters the channel 330 in the rotary shell 300 from the pre-treatment pipeline 200 and the air inlet 310 in turn, passes through multiple catalyst components 400 in turn and is discharged from the outlet 320. When the flue gas passes through the catalyst plate 410 of the first catalyst component 400, part of the flue gas passes through the catalyst part 413 and reacts with the catalyst before entering between the catalyst plate 410 and the guide plate 420, and part of the flue gas enters between the catalyst plate 410 and the guide plate 420 through the first through hole 414; since the phase angle of the first through hole 414 and the second through hole 423 of the same catalyst component 400 on the circumferential direction of the guide plate 420 is greater than 135° and less than 180°, the unreacted flue gas can be fully mixed with the reacted flue gas in the process of flowing to the second through hole 423, and the mixed flue gas is discharged from the second through hole 423 on the guide plate 420, and continues to pass through the second catalyst component 400 along the above path. Furthermore, since the plurality of catalytic assemblies 400 are distributed at intervals by moving in sequence in the channel 330, and the catalytic portion 413 does not rotate during the movement, the intermediate rings 412 and the inner plates 422 of the plurality of catalytic assemblies 400 are located on the same spiral path, so that in two adjacent catalytic assemblies 400, the second through hole 423 on the guide plate 420 of the upstream catalytic assembly 400 and the first through hole 414 on the catalytic plate 410 of the downstream catalytic assembly 400 are misaligned in the circumferential direction of the guide plate 420, which makes the upstream catalytic assembly 400 0, the path of the flue gas received by the catalytic plate 410 flowing from the top of the catalytic plate 410 to the first through hole 414 thereof is misaligned with the path of the flue gas received by the catalytic plate 410 of the downstream catalytic component 400 flowing from the top of the catalytic plate 410 to the first through hole 414 thereof, so that when the catalytic component 400 moves to different positions in the channel 330, the flue gas can flow from different positions of the catalytic plate 410 to the first through hole 414, and in this process, part of the flue gas passes through the catalytic portion 413, so that the catalysts at different positions on the circumference of the catalytic portion 413 can be fully utilized.

[0045] After working for a certain period of time, when the catalyst assembly 400 needs to be replaced, the air inlet valve at the air inlet 310 can be closed first, and after the smoke in the rotating shell 300 is exhausted, the air outlet valve at the air outlet 320 can be closed, and then the transmission belt drives all the catalyst assemblies 400 to move a certain distance, disassemble the upper end of the rotating shell 300, take out the catalyst assembly 400 that has moved to the end position, and place a new catalyst assembly 400 at the initial position, and the initial phase angles of the first through hole 414 and the second through hole 423 of the new catalyst assembly 400 placed each time are the same, and the first through hole 414 is in the same position on the circumference of the catalyst plate 410, and the second through hole 423 is in the same position on the circumference of the guide plate 420. After the replacement and installation is completed, the upper end of the rotating shell 300 is installed, and the air inlet valve at the air inlet 310 and the air outlet valve at the air outlet 320 are opened to continue normal operation.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A row-type light-burned magnesium oxide calcining system, characterized in that: Including crushing equipment, calcining furnace, dust removal equipment and denitrification equipment; The crushing equipment crushes the ore and then transports it to the calcining furnace. The calcining furnace uses natural gas to heat its interior to make the ore react. The calcined material is discharged from the bottom of the calcining furnace. The separated gas enters the dust removal equipment through a pipeline for dust removal and then enters the denitrification equipment for denitrification. The denitration equipment includes a support frame, a rotating shell and a catalytic component; the rotating shell is fixed to the support frame, and a channel for flue gas flow is opened in the rotating shell; There are multiple catalytic assemblies, all of which are arranged in the rotating shell and are arranged in sequence along the extension direction of the channel; each catalytic assembly includes a catalytic plate and a guide plate arranged in sequence, the catalytic plate and the guide plate are arranged perpendicular to the extension direction of the channel, and the catalytic plate is located on the air inlet side of the guide plate; the catalytic plate includes an outer ring portion, an intermediate ring and a catalytic portion arranged in sequence from the outside to the inside, the catalytic portion is provided with a catalyst for reacting with the flue gas, and the flue gas can enter between the catalytic plate and the guide plate through the catalytic portion; the catalytic portion is fixedly connected to the outer ring portion, and the intermediate ring is rotatably connected to the outer ring portion; a first through hole is opened on one side edge of the intermediate ring; the guide plate includes an outer ring portion arranged in sequence from the outside to the inside; the intermediate ring and the guide plate are ... The mounting ring and the inner plate are arranged and rotatably matched, and a second through hole is opened on one side edge of the inner plate; the phase angle between the first through hole and the second through hole of the same catalytic component in the circumferential direction of the guide plate is greater than 135° and less than 180°; the outer ring parts and the mounting rings of multiple catalytic components move synchronously along the extension direction of the channel, and during the movement, the middle rings and the inner plates of multiple catalytic components move along the same spiral path and rotate; in the process of the catalytic component moving from the initial position to the terminal position in the channel, the middle ring and the inner plate rotate at least one circle; the initial position is the placement position for replacing the new catalytic component, and the terminal position is the position for taking out the old catalytic component.

2. A row-type light-burned magnesium oxide calcining system according to claim 1, characterized in that: An air inlet and an air outlet are arranged on the rotary shell. The smoke enters from the air inlet and flows through the channel and then is discharged from the air outlet.

3. A row-type light-burned magnesium oxide calcining system according to claim 1, characterized in that: The inner wall of the rotating shell is provided with slide grooves arranged along the extension direction of the channel, and there are at least three groups of slide grooves. The outer ring part and the outer ring of the mounting ring are slidably matched with at least three groups of slide grooves; at least three groups of slide grooves restrict the catalyst plate and the guide plate to always be perpendicular to the extension direction of the channel.

4. A row-type light-burned magnesium oxide calcining system according to claim 3, characterized in that: The inner wall of the rotating shell is also provided with a plurality of spiral tracks, which are arranged at intervals around the circumference of the channel and all extend spirally along the extension direction of the channel; the outer peripheral walls of the intermediate ring and the inner plate extend outward relative to the outer ring portion and the mounting ring respectively, and the outer peripheral walls of the intermediate ring and the inner plate are provided with grooves for cooperating with the spiral tracks; the spiral tracks are disconnected at the intersection with the slide grooves, and the number of the spiral tracks is greater than the number of the slide grooves.

5. A row-type light-burned magnesium oxide calcining system according to claim 3, characterized in that: The interior of the rotating shell is in a ring shape around a horizontal axis, and the upper ends of the rings are not connected to each other, so as to define a U-shaped channel in the rotating shell; the air inlet and the air outlet are respectively located on both sides of the upper end of the rotating shell; the initial position is located on the air inlet side of the channel and below the air inlet, and the end position is located on the air outlet side of the channel and below the air outlet.

6. A row-type light-burned magnesium oxide calcining system according to claim 5, characterized in that: The side wall of the channel located in the inner ring of the ring is the inner ring wall, and the side wall of the channel located in the outer ring of the ring is the outer ring wall; there is at least one slide groove located on the inner wall of the rotating shell and in the middle position between the inner ring wall and the outer ring wall, and an annular transmission belt is arranged in the slide groove, and the transmission belt is connected to the outer ring parts and mounting rings of multiple catalytic components to drive the catalytic components to move along the slide groove.

7. A row-type light-burned magnesium oxide calcining system according to claim 6, characterized in that: The outer ring portion and the outer ring of the mounting ring are both provided with a plurality of mounting blocks, each mounting block is correspondingly mounted in a slide slot, and at least one mounting block is detachably connected to the transmission belt in the slide slot.

8. A row-type light-burned magnesium oxide calcining system according to claim 5, characterized in that: The denitrification equipment also includes a pre-treatment channel, which is fixed to a supporting frame and is used to disperse the flue gas and guide the flue gas into the air inlet from bottom to top.

9. A row-type light-burned magnesium oxide calcining system according to claim 1, characterized in that: The upper end of the rotary shell is a detachable structure.

10. A row-type light-burned magnesium oxide calcining system according to claim 1, characterized in that: The outer ring part, the mounting ring and the inner ring of the intermediate ring are all provided with annular grooves. The intermediate ring is rotatably mounted in the annular groove of the inner ring of the outer ring part. The inner plate is rotatably mounted in the annular groove of the inner ring of the mounting ring. The catalytic part is rotatably matched with the annular groove of the inner ring of the intermediate ring.

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