A flue gas treatment system of a double alkali desulfurization process

Abstract

The application relates to a flue gas treatment system of a double-alkali desulfurization process, and belongs to the technical field of flue gas treatment systems. The flue gas treatment system comprises a flue gas flow guide pipe, a cleaning mechanism for cleaning dust and a recovery mechanism for recovering dust are arranged in the flue gas flow guide pipe, the cleaning mechanism comprises a cleaning brush, the cleaning brush is slidingly arranged in the flue gas flow guide pipe, the cleaning brush is attached to the bottom wall of the flue gas flow guide pipe, and a sliding assembly for driving the cleaning brush to slide in the flue gas flow guide pipe is arranged in the flue gas flow guide pipe. The application has the effect of conveniently cleaning the dust accumulated at the bottom of the flue gas flow guide pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas treatment system, in particular to a flue gas treatment system of double alkali desulfurization process. BACKGROUND

[0002] In the process of burning fossil fuels, and the process of roasting, forging and other heat of sulfide ore, a large amount of sulfur-containing flue gas will be produced, and now the flue gas treatment system with double alkali desulfurization process is generally used to treat these sulfur-containing flue gas.

[0003] The flue gas treatment system in the prior art comprises a flue gas flow pipe, a dust removal chamber, a pretreatment chamber and a high-efficiency desulfurization tower, one end of the flue gas flow pipe is connected and communicated with a feeding pipe, the other end of the flue gas flow pipe is connected and communicated with a discharging pipe, the end of the discharging pipe away from the flue gas flow pipe is connected and communicated with the dust removal chamber, the dust removal chamber and the pretreatment chamber are connected and communicated through a connecting pipe, and the pretreatment chamber and the high-efficiency desulfurization tower are connected and communicated through a joint pipe; the sulfur-containing flue gas is discharged from the kiln, enters the flue gas flow pipe through the feeding pipe, then floats to the discharging pipe and enters the dust removal chamber through the discharging pipe for dust removal, the flue gas after dust removal enters the pretreatment chamber through the connecting pipe, the pretreatment chamber performs pre-desulfurization and further dust removal on the flue gas, and finally the flue gas enters the high-efficiency desulfurization tower through the joint pipe, completes desulfurization and washing in the tower, and is discharged after demisting and dewatering in the tower.

[0004] Before the flue gas enters the dust removal chamber from the flue gas flow pipe, part of the dust carried in the flue gas will accumulate at the bottom of the flue gas flow pipe, the dust in the flue gas flow pipe is not easy to clean, and too much accumulation may cause the discharging pipe to be blocked, thereby affecting the normal use of the flue gas treatment system. SUMMARY

[0005] In order to facilitate the cleaning of the dust accumulated at the bottom of the flue gas flow pipe, the present application provides a flue gas treatment system of double alkali desulfurization process.

[0006] The flue gas treatment system of double alkali desulfurization process provided by the present application adopts the following technical scheme:

[0007] A flue gas treatment system of double alkali desulfurization process, comprising a flue gas flow pipe, a cleaning mechanism for cleaning dust and a recovery mechanism for recovering dust are arranged in the flue gas flow pipe, the cleaning mechanism comprises a cleaning brush, the cleaning brush is slidingly arranged in the flue gas flow pipe, the cleaning brush is attached to the bottom wall of the flue gas flow pipe, and a sliding assembly for driving the cleaning brush to slide in the flue gas flow pipe is arranged in the flue gas flow pipe.

[0008] By adopting the above technical scheme, the cleaning brush is arranged in the flue gas flow guide pipe under the action of the sliding assembly, the bottom wall of the flue gas flow guide pipe is cleaned while the cleaning brush slides, and the dust after cleaning is recycled by the recycling mechanism, so that the operator does not need to enter the flue gas flow guide pipe to operate, thereby facilitating the cleaning of the dust accumulated at the bottom of the flue gas flow guide pipe.

[0009] Preferably, the sliding assembly comprises two reciprocating wire rods rotatably arranged in the flue gas flow guide pipe, the two reciprocating wire rods are respectively located at two ends of the cleaning brush, both ends of the cleaning brush are rotatably connected with guide blocks, the reciprocating wire rods are provided with reciprocating slides for the sliding of the guide blocks, and the cleaning brush is arranged in the flue gas flow guide pipe while the guide blocks slide in the reciprocating slides.

[0010] By adopting the above technical scheme, when the reciprocating wire rods rotate under the action of the driving assembly, the cleaning brush can make reciprocating circular motion along the length direction of the flue gas flow guide pipe, thereby repeatedly cleaning the dust accumulated on the bottom wall of the flue gas flow guide pipe, and the dust accumulated at the bottom of the flue gas flow guide pipe can be cleaned more cleanly.

[0011] Preferably, the driving assembly comprises a first bevel gear coaxially connected with the reciprocating wire rod, the flue gas flow guide pipe is rotatably connected with a second bevel gear meshing with the first bevel gear, the second bevel gear is coaxially connected with a rotating shaft, the rotating shaft extends out of the flue gas flow guide pipe, and the flue gas flow guide pipe is provided with a driving piece for driving the rotating shaft to rotate.

[0012] By adopting the above technical scheme, the rotating shaft rotates under the action of the driving piece, the rotating shaft drives the second bevel gear to rotate when the rotating shaft rotates, and the two reciprocating wire rods can be driven to rotate at the same time under the cooperation of the meshing of the first bevel gear and the second bevel gear, thereby saving energy.

[0013] Preferably, the recycling mechanism comprises a recycling box located below the flue gas flow guide pipe, the bottom wall of the flue gas flow guide pipe is provided with a recycling opening penetratingly formed therein, the recycling opening is in communication with the recycling box, the flue gas flow guide pipe is provided with a box door for closing the recycling opening, the box door is rotatably arranged in the flue gas flow guide pipe, and the flue gas flow guide pipe is provided with a control assembly for controlling the rotation of the box door.

[0014] By adopting the above technical scheme, when the flue gas treatment system is normally used, the box door is closed to close the communication between the recycling opening and the recycling box, when the flue gas flow guide pipe is cleaned, the box door is rotated to the recycling opening in communication with the recycling box by the control assembly, and the dust can fall into the recycling box, so that the dust can be collected and treated, and the collected and cleaned dust is convenient to collect.

[0015] Preferably, the control assembly comprises a rotating gear and a rack, the rotating gear is rotatably connected with the box door, the rack is slidably arranged on the flue, the rotating gear and the rack are engaged, the rack is connected with a driving block, the cleaning brush is in contact with the driving block after sliding and drives the rack to slide through the driving block, and the flue is provided with a reset elastic member for sliding the rack away from the rotating gear.

[0016] By adopting the above technical scheme, the cleaning brush is in contact with the driving block after sliding, and the driving block and the rack fixed with the driving block slide with the sliding of the cleaning brush. Under the engagement of the rack and the rotating gear, the box door is opened, and the dust can fall into the recycling box. When the cleaning brush slides away from the discharge pipe, the rack slides away from the rotating gear under the action of the reset elastic member, and the box door is closed. The opening and closing of the box door is realized by the sliding of the cleaning brush, without the need for an additional power source, thereby saving energy.

[0017] Preferably, a driving groove for sliding the driving block is formed in the bottom wall of the flue, a dustproof block for closing the driving groove is slidably connected to the flue, a dustproof groove for sliding the dustproof block is formed in the flue, the dustproof groove is in communication with the driving groove and the recycling opening, an inclined surface is formed at one end of the dustproof block located at the recycling opening, the inclined surface is located at one end of the dustproof block facing the box door, the dustproof block slides to close the driving groove when the box door closes the recycling opening, and a driving elastic member is arranged on the flue for driving the dustproof block to slide away from the driving groove.

[0018] By adopting the above technical scheme, the dustproof block is used to close the driving groove, so that the driving groove is not easy to accumulate dust, and the engagement between the rotating gear and the rack is not easy to be affected by dust. When the box door closes the recycling opening, the dustproof block slides to close the driving groove under the cooperation of the inclined surface and the box door. When the box door is opened, the dustproof block slides to release the closure of the driving groove under the action of the driving spring, so that the driving block can slide in the driving groove. The opening and closing of the box door controls the opening and closing of the driving groove, and the opening and closing of the box door is controlled by the sliding of the cleaning brush, without the need for an additional power source, thereby saving energy.

[0019] Preferably, a limiting block is slidably connected to the dustproof block, a limiting groove for sliding the limiting block is formed in the dustproof block, and a limiting elastic member is arranged in the dustproof block for driving the limiting block to slide out of the limiting groove. When the box door closes the recycling opening, one end of the limiting block away from the dustproof block is in contact with the driving block.

[0020] By adopting the above technical solution, since the opening and closing of the drive slot needs to be controlled by the opening and closing of the door, and the opening and closing of the door needs to be achieved by the sliding of the drive block in the drive slot, the limit block is set so that when the cleaning brush drives the drive block to slide, the limit block first slides into the limit slot as the drive block slides. When the rack slides to the point where the door rotates and the door releases the restriction on the dustproof block, the dustproof block slides down under the action of the drive spring to release the seal on the drive slot. The limit block has a yielding function for the sliding of both the drive block and the dustproof block. By setting the limit elastic element, the limit block can be kept in contact with the drive block, further sealing the drive slot between the drive block and the dustproof block, so that dust is not easy to accumulate in the drive slot.

[0021] Preferably, a plurality of ball bearings are embedded in the inner wall of the dustproof groove, and the ball bearings are in contact with the dustproof block.

[0022] By adopting the above technical solution and setting the ball bearings, the friction between the dustproof block and the dustproof groove is reduced, which facilitates the sliding of the dustproof block in the dustproof groove and improves the stability of the dustproof block sliding in the dustproof groove.

[0023] Preferably, the flue gas diversion pipe is connected to a plurality of air blowing pipes, and all of the plurality of air blowing pipes are connected to the flue gas diversion pipe.

[0024] By adopting the above technical solution, air is blown from the air blowing pipe into the flue gas diversion pipe, which makes the dust drift towards the discharge pipe. In this process, the accumulation of dust on the bottom wall can be reduced, the time consumed by the subsequent cleaning brush can be reduced, and the work efficiency can be improved.

[0025] Preferably, the air blowing pipe is connected to a ventilation pipe, and the end of the ventilation pipe away from the air blowing pipe extends to the meshing point of the first bevel gear and the second bevel gear.

[0026] By adopting the above technical solution, a large amount of dust is present in the flue gas diversion pipe. The dust accumulated at the meshing point of the first bevel gear and the second bevel gear is cleaned through the vent pipe. This prevents the first bevel gear and the second bevel gear from being unable to mesh due to dust accumulation between their teeth, thus improving the reliability of the device.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The cleaning brush is slidably positioned inside the flue gas diversion pipe under the action of the sliding component. While the cleaning brush slides, it cleans the bottom wall of the flue gas diversion pipe. The cleaned dust is recovered by the recycling mechanism. There is no need for operators to enter the flue gas diversion pipe to operate, which makes it easy to clean the dust accumulated at the bottom of the flue gas diversion pipe.

[0029] 2. When the reciprocating wire rod rotates under the action of the driving assembly, the cleaning brush can reciprocate along the length direction of the flue gas flow pipe, thereby repeatedly cleaning the dust accumulated on the bottom wall of the flue gas flow pipe, and the dust accumulated at the bottom of the flue gas flow pipe can be cleaned more cleanly. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0031] Figure 2 is a schematic diagram of the internal structure of the flue gas flow pipe in the embodiment of the present application.

[0032] Figure 3 is a schematic diagram of the reciprocating wire rod structure in the embodiment of the present application.

[0033] Figure 4 is a schematic diagram of the cleaning brush structure in the embodiment of the present application.

[0034] Figure 5 is a schematic diagram of the recycling mechanism in the embodiment of the present application.

[0035] Figure 6 is a schematic diagram of the dust removal block structure in the embodiment of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS: 1, flue gas flow pipe; 11, feed pipe; 12, discharge pipe; 13, cleaning mechanism; 14, recycling mechanism; 15, rotating shaft; 151, second bevel gear; 16, rotating motor; 17, air blowing pipe; 171, air pipe; 18, recycling box; 181, recycling opening; 19, box door; 2, dust removal chamber; 3, pretreatment chamber; 31, connecting pipe; 32, joint pipe; 4, high-efficiency desulfurization tower; 5, cleaning brush; 51, guide block; 6, reciprocating wire rod; 61, reciprocating slide; 611, first slide; 612, second slide; 613, turning slide; 62, protective sleeve; 621, guide groove; 63, first bevel gear; 7, rotating gear; 71, rack; 711, driving block; 712, return spring; 713, driving groove; 8, dustproof block; 81, dustproof groove; 811, ball bearing; 82, inclined surface; 83, driving spring; 84, limiting block; 841, limiting groove; 842, limiting spring. DETAILED DESCRIPTION

[0037] The following will be described in detail in combination with the accompanying Figures 1-6 The present application will be further described in detail.

[0038] The embodiment of the present application discloses a flue gas treatment system for a dual-alkali desulfurization process, which refers to Figure 1, the flue gas flow pipe 1, the dust removal chamber 2, the pretreatment chamber 3 and the high-efficiency desulfurization tower 4, one end of the flue gas flow pipe 1 is fixedly connected with the feeding pipe 11, the feeding pipe 11 communicates with the flue gas flow pipe 1 and the feeding pipe 11 is located at the top end of the flue gas flow pipe 1, the other end of the flue gas flow pipe 1 is fixedly connected with the discharging pipe 12, and one end, away from the flue gas flow pipe 1, of the discharging pipe 12 is fixedly connected with and communicates with the dust removal chamber 2; the pretreatment chamber 3 is fixedly connected with the connecting pipe 31 and the joint pipe 32, the connecting pipe 31 and the joint pipe 32 communicate with the pretreatment chamber 3, one end, away from the pretreatment chamber 3, of the connecting pipe 31 is fixedly connected with and communicates with the dust removal chamber 2, and one end, away from the pretreatment chamber 3, of the joint pipe 32 is fixedly connected with and communicates with the high-efficiency desulfurization tower 4; after the flue gas containing sulfur is discharged from the kiln, the flue gas enters the flue gas flow pipe 1 through the feeding pipe 11, then floats to the discharging pipe 12 and enters the dust removal chamber 2 through the discharging pipe 12, the dust removal chamber 2 removes dust from the flue gas, the flue gas after dust removal enters the pretreatment chamber 3 through the connecting pipe 31, the pretreatment chamber 3 desulfurizes and further removes dust from the flue gas, and finally the flue gas enters the high-efficiency desulfurization tower 4 through the joint pipe 32, desulfurization and washing are completed in the high-efficiency desulfurization tower 4, and the flue gas after purification is removed from the high-efficiency desulfurization tower 4 after demisting and dewatering.

[0039] With reference to Figure 1 and Figure 2 , the flue gas flow pipe 1 is a square tube, the flue gas flow pipe 1 is provided with a cleaning mechanism 13 for cleaning dust and a recycling mechanism 14 for recycling dust, the dust cleaned by the cleaning mechanism 13 is collected by the recycling mechanism 14, so that the dust in the flue gas is not easy to accumulate at the bottom of the flue gas flow pipe 1; the cleaning mechanism 13 comprises a cleaning brush 5, the cleaning brush 5 is attached to the bottom wall of the flue gas flow pipe 1, the cleaning brush 5 is slidingly arranged in the flue gas flow pipe 1, the cleaning brush 5 is perpendicular to the length direction of the flue gas flow pipe 1, and the cleaning brush 5 slides along the length direction of the flue gas flow pipe 1.

[0040] With reference to Figure 2 , Figure 3 and Figure 4, the flue gas drainage pipe 1 is provided with a sliding assembly for driving the cleaning brush 5 to reciprocate in the flue gas drainage pipe 1, the sliding assembly comprises two reciprocating lead screws 6 rotatably arranged in the flue gas drainage pipe 1, the two reciprocating lead screws 6 are located at two ends of the cleaning brush 5 respectively, and the two reciprocating lead screws 6 are arranged along the length direction of the flue gas drainage pipe 1; both ends of the cleaning brush 5 are rotatably connected with a guide block 51, the rotation axis of the guide block 51 is coaxial with the axis of the cleaning brush 5, a reciprocating slide 61 for sliding of the guide block 51 is formed in the reciprocating lead screw 6, the reciprocating slide 61 comprises a first slide 611, a second slide 612 and a turning slide 613, the first slide 611 and the second slide 612 are both arranged in a spiral, the rotation directions of the first slide 611 and the second slide 612 are opposite, and the first slide 611 and the second slide 612 are arranged in a cross manner, the two ends of the reciprocating lead screw 6 are both provided with the turning slide 613, the turning slide 613 is communicated with the first slide 611 and the second slide 612, one end of the turning slide 613 is arranged according to the track of the first slide 611, and the other end of the turning slide 613 is arranged according to the track of the second slide 612; when the reciprocating lead screw 6 rotates, the guide block 51 can slide in the reciprocating slide 61, so that the cleaning brush 5 can reciprocate in the flue gas drainage pipe 1 and clean the bottom wall of the flue gas drainage pipe 1.

[0041] With reference to Figure 2 And Figure 3 , a protective sleeve 62 is arranged on the reciprocating lead screw 6, the protective sleeve 62 is arranged along the length direction of the reciprocating lead screw 6, a guide groove 621 is formed in the protective sleeve 62, and the guide groove 621 is arranged along the length direction of the protective sleeve 62; the protective sleeve 62 can not only prevent dust from accumulating in the reciprocating slide 61, but also guide the sliding of the cleaning brush 5 in the flue gas drainage pipe 1, thereby improving the stability of the cleaning brush 5 sliding in the flue gas drainage pipe 1 through the reciprocating lead screw 6.

[0042] With reference to Figure 2 , the flue gas drainage pipe 1 is provided with a driving assembly for driving the reciprocating lead screw 6 to rotate, the driving assembly comprises a first bevel gear 63 fixed coaxially with the reciprocating lead screw 6, the first bevel gear 63 is located at one end of the reciprocating lead screw 6 close to the feeding pipe 11, a rotating shaft 15 is rotatably connected in the flue gas drainage pipe 1, two second bevel gears 151 are fixed coaxially on the rotating shaft 15, and the two second bevel gears 151 are respectively engaged with the first bevel gears 63 on the two reciprocating lead screws 6; the rotating shaft 15 is driven to rotate, the second bevel gears 151 are driven to rotate, the two reciprocating lead screws 6 are driven to rotate at the same time under the cooperation of the engagement of the first bevel gears 63 and the second bevel gears 151, and energy is saved; one end of the rotating shaft 15 extends out of the flue gas drainage pipe 1, and the flue gas drainage pipe 1 is provided with a driving member for driving the rotating shaft 15 to rotate; in the embodiment, the driving member is a rotating motor 16, and an output shaft of the rotating motor 16 is fixed coaxially with the rotating shaft 15.

[0043] With reference toFigure 1 And Figure 2 The lower part of the flue gas flow pipe 1 is fixedly connected with four air blowing pipes 17, the four air blowing pipes 17 are communicated with the flue gas flow pipe 1, the four air blowing pipes 17 are arranged along the length direction of the flue gas flow pipe 1, the air blowing pipe 17 is located between the feeding pipe 11 and the discharging pipe 12, air can be blown from the air blowing pipe 17 to the flue gas flow pipe 1 through an air source, so that the flue gas and dust entering the flue gas flow pipe 1 can smoothly float to the discharging pipe 12; in order to prevent dust from accumulating at the meshing position of the first bevel gear 63 and the second bevel gear 151, the air blowing pipe 17 closest to the feeding pipe 11 is fixedly connected with two air pipes 171 which are communicated with the air blowing pipe 17, one end of the air pipe 171 away from the air blowing pipe 17 extends to the meshing position of the first bevel gear 63 and the second bevel gear 151.

[0044] Referring to Figure 2 And Figure 5 The recovery mechanism 14 includes a recovery box 18 placed below the flue gas flow pipe 1, the recovery box 18 is fixed to the flue gas flow pipe 1 through bolts, the recovery box 18 can be detached from the flue gas flow pipe 1 for cleaning; a recovery opening 181 is formed through the bottom wall of the flue gas flow pipe 1, the recovery opening 181 is located between the feeding pipe 11 and the discharging pipe 12 and close to the discharging pipe 12, the recovery opening 181 is located directly above the recovery box 18, the recovery opening 181 is communicated with the recovery box 18, the cleaning brush 5 can sweep the dust in the flue gas flow pipe 1 to the position above the recovery opening 181 and then fall into the recovery box 18 through the recovery opening 181.

[0045] Referring to Figure 2 And Figure 5, the inner wall of the recovery port 181 is arranged in a stepped manner, and the opening and closing of the recovery port 181 can be controlled through the rotation of the box door 19; the smoke flow guide pipe 1 is provided with a control assembly for controlling the rotation of the box door 19, the control assembly includes two rotating gears 7 and two racks 71, the two rotating gears 7 are located at two ends of the box door 19 respectively, the two rotating gears 7 are rotationally connected with the box door 19, the rotating gear 7 rotates around its own axis as the rotation axis, the rack 71 is slidingly arranged on the bottom wall of the smoke flow guide pipe 1, and the rotating gear 7 is engaged with the rack 71; one end of the rack 71 away from the rotating gear 7 is fixedly connected with a driving block 711, the cleaning brush 5 is first attached to the driving block 711 after sliding, and the driving block 711 and the rack 71 fixedly connected with the driving block 711 slide along with the sliding of the cleaning brush 5, so that the box door 19 is opened, and the dust can fall into the recovery box 18; the smoke flow guide pipe 1 is provided with a reset elastic member for sliding the rack 71 in a direction away from the rotating gear 7, in the embodiment, the reset elastic member is a reset spring 712, one end of the reset spring 712 is fixed with the smoke flow guide pipe 1, and the other end of the reset spring 712 is fixed with the rack 71, when the cleaning brush 5 slides towards the square box away from the recovery port 181, the reset spring 712 drives the rack 71 to slide in a direction away from the rotating gear 7, and drives the box door 19 to rotate to close the recovery port 181.

[0046] With reference to Figure 2 and Figure 5 , the bottom wall of the smoke flow guide pipe 1 is provided with a driving groove 713 for sliding of the driving block 711, in order to prevent dust from accumulating in the driving groove 713 during normal use of the smoke flow guide pipe 1, the smoke flow guide pipe 1 is slidingly connected with a dustproof block 8 for closing the driving groove 713, the dustproof block 8 slides along the width direction of the smoke flow guide pipe 1, the smoke flow guide pipe 1 is provided with a dustproof groove 81 for sliding of the dustproof block 8, the dustproof groove 81 is in communication with the driving groove 713 and the recovery port 181, and the dustproof block 8 is attached to the inner wall of the dustproof groove 81; one end of the dustproof block 8 located at the recovery port 181 is provided with an inclined surface 82, the inclined surface 82 is located at one end of the dustproof block 8 facing the box door 19, and the dustproof block 8 slides to close the driving groove 713 under the cooperation of the inclined surface 82 and the box door 19 when the box door 19 closes the recovery port 181; the smoke flow guide pipe 1 is provided with a driving elastic member for driving the dustproof block 8 to slide in a direction away from the driving groove 713, in the embodiment, the driving elastic member is a driving spring 83, one end of the driving spring 83 is fixed with the inner wall of the dustproof groove 81, and the other end of the driving spring 83 is fixed with the dustproof block 8, when the box door 19 is opened, the dustproof block 8 slides to release the closure of the driving groove 713 under the action of the driving spring 83, and the driving block 711 can slide in the driving groove 713, the opening and closing of the driving groove 713 is controlled through the opening and closing of the box door 19, and energy is further saved.

[0047] With reference toFigure 5 and Figure 6 The dustproof block 8 is slidably connected with a limiting block 84, and the flue gas guiding pipe 1 is provided with a receiving groove for sliding of the limiting block 84, the receiving groove being in communication with the driving groove 713 and the dustproof groove 81, the limiting block 84 sliding along the length direction of the flue gas guiding pipe 1, the limiting block 84 having the same width as the driving groove 713, the dustproof upper inner wall being provided with a limiting groove 841 for sliding of the limiting block 84, and the dustproof block 8 being provided with a limiting elastic member for driving the limiting block 84 to slide outwardly towards the limiting groove 841, in the embodiment, the limiting elastic member is a limiting spring 842, one end of the limiting spring 842 being fixed to the inner wall of the limiting groove 841, and the other end of the limiting spring 842 being fixed to the limiting block 84, and when the box door 19 closes the recovery port 181, the end of the limiting block 84 away from the dustproof block 8 is attached to the driving block 711.

[0048] Since the opening and closing of the box door 19 is needed to control the opening and closing of the driving groove 713, and the opening and closing of the box door 19 is needed to be realized by sliding of the driving block 711 in the driving groove 713, by setting the limiting block 84, when the cleaning brush 5 drives the driving block 711 to slide, with the sliding of the driving block 711, the limiting block 84 first slides inwardly towards the limiting groove 841, when the rack 71 slides to the rotation of the box door 19, the box door 19 removes the restriction on the dustproof block 8, and the dustproof block 8 slides to remove the closure of the driving groove 713 under the action of the driving spring 83, and the limiting block 84 also slides outwardly of the limiting groove 841 and is received in the receiving groove under the action of the limiting spring 842.

[0049] Referring to Figure 5 In order to facilitate the sliding of the dustproof block 8 in the dustproof groove 81, a plurality of rolling balls 811 are embedded on the inner wall of the dustproof groove 81, the rolling balls 811 being attached to the dustproof block 8, and by setting the rolling balls 811, the friction between the dustproof block 8 and the dustproof groove 81 is reduced.

[0050] The implementation principle of the flue gas treatment system of the dual-alkali desulfurization process according to the embodiment is as follows: the flue gas containing sulfur is discharged from the kiln, enters the flue gas guiding pipe 1 through the feeding pipe 11, and then flows to the discharging pipe 12 and enters the dust removal chamber 2 through the discharging pipe 12, the dust removal chamber 2 performs dust removal treatment on the flue gas, the dust-removed flue gas enters the pretreatment chamber 3 through the connecting pipe 31, the pretreatment chamber 3 performs pre-desulfurization and further dust removal on the flue gas, and finally the flue gas enters the high-efficiency desulfurization tower 4 through the joint pipe 32, and the desulfurization and washing are completed in the tower, and the purified flue gas is discharged out of the high-efficiency desulfurization tower 4 after being demisted and dewatered in the high-efficiency desulfurization tower 4.

[0051] When the flue gas flow pipe 1 is cleaned, the rotating motor 16 is started, the rotating shaft 15 is rotated by the rotating motor 16, the second bevel gear 151 is rotated when the rotating shaft 15 rotates, and the two reciprocating lead screws 6 are simultaneously rotated under the cooperation of the first bevel gear 63 and the second bevel gear 151. Under the cooperation of the reciprocating slide 61 and the guide block 51, the cleaning brush 5 can slide reciprocally in the flue gas flow pipe 1.

[0052] After the cleaning brush 5 slides, the driving block 711 is first attached, and the driving block 711 and the rack 71 fixedly connected with the driving block 711 are slid under the sliding of the cleaning brush 5. The driving block 711 first pushes the limiting block 84 to slide into the limiting groove 841. When the rack 71 slides to the rotating box door 19, and the box door 19 releases the restriction on the dustproof block 8, the dustproof block 8 slides to release the closure of the driving groove 713 under the action of the driving spring 83, and the limiting block 84 slides out of the limiting groove 841 and is accommodated in the accommodating groove under the action of the limiting spring 842. The cleaning brush 5 can clean the dust from the recovery port 181 to the recovery box 18.

[0053] When the cleaning brush 5 slides away from the discharge pipe 12, the rack 71 slides away from the rotating gear 7 under the action of the reset spring 712. When the box door 19 closes the recovery port 181, the dustproof block 8 slides to close the driving groove 713 under the cooperation of the box door 19 and the inclined surface 82 on the dustproof block 8.

[0054] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A flue gas treatment system for a dual alkali desulphurization process comprising a flue gas duct (1), characterized in that: The flue gas flow pipe (1) is provided with a cleaning mechanism (13) for cleaning dust and a recovery mechanism (14) for recovering dust, the cleaning mechanism (13) comprises a cleaning brush (5) which is slidingly arranged in the flue gas flow pipe (1), the cleaning brush (5) is attached to the bottom wall of the flue gas flow pipe (1), and the flue gas flow pipe (1) is provided with a sliding assembly for driving the cleaning brush (5) to slide in the flue gas flow pipe (1); a plurality of air blowing pipes (17) are connected to the flue gas flow pipe (1), and the plurality of air blowing pipes (17) are in communication with the flue gas flow pipe (1); the air blowing pipe (17) is connected with an air pipe (171); the sliding assembly comprises two reciprocating wire rods (6) which are rotationally arranged in the flue gas flow pipe (1), the two reciprocating wire rods (6) are located at the two ends of the cleaning brush (5) respectively, the two ends of the cleaning brush (5) are rotationally connected with guide blocks (51), the reciprocating wire rods (6) are provided with reciprocating slides (61) for sliding of the guide blocks (51), the cleaning brush (5) is slidingly arranged in the flue gas flow pipe (1) when the guide blocks (51) slide in the reciprocating slides (61), and the flue gas flow pipe (1) is provided with a driving assembly for driving the reciprocating wire rods (6) to rotate; the recovery mechanism (14) comprises a recovery box (18) located below the flue gas flow pipe (1), a recovery port (181) is penetratingly arranged on the bottom wall of the flue gas flow pipe (1), the recovery port (181) is in communication with the recovery box (18), the flue gas flow pipe (1) is provided with a box door (19) for closing the recovery port (181), the box door (19) is rotationally arranged in the flue gas flow pipe (1), and the flue gas flow pipe (1) is provided with a control assembly for controlling rotation of the box door (19); the control assembly comprises a rotating gear (7) and a rack (71), the rotating gear (7) is rotationally connected with the box door (19), the rack (71) is slidingly arranged on the flue gas flow pipe (1), the rotating gear (7) and the rack (71) are engaged, the rack (71) is connected with a driving block (711), the cleaning brush (5) is attached to the driving block (711) after sliding and drives the rack (71) to slide through the driving block (711), and the flue gas flow pipe (1) is provided with a reset elastic member for sliding the rack (71) towards the direction away from the rotating gear (7).The bottom wall of the smoke flow guide pipe (1) is provided with a driving groove (713) for sliding of a driving block (711), the smoke flow guide pipe (1) is slidably connected with a dustproof block (8) for closing the driving groove (713), the smoke flow guide pipe (1) is provided with a dustproof groove (81) for sliding of the dustproof block (8), the dustproof groove (81) is in communication with the driving groove (713) and the recovery port (181), the dustproof block (8) is provided with an inclined surface (82) at one end of the recovery port (181), the inclined surface (82) is located at one end of the dustproof block (8) facing the box door (19), when the box door (19) closes the recovery port (181), the dustproof block (8) slides to close the driving groove (713), the smoke flow guide pipe (1) is provided with a driving elastic member for driving the dustproof block (8) to slide in a direction away from the driving groove (713); the dustproof block (8) is slidably connected with a limiting block (84), the dustproof block is provided with a limiting groove (841) for sliding of the limiting block (84), the dustproof block (8) is provided with a limiting elastic member for driving the limiting block (84) to slide out of the limiting groove (841), when the box door (19) closes the recovery port (181), one end of the limiting block (84) away from the dustproof block (8) is attached to the driving block (711).

2. The dual alkali desulphurization process flue gas treatment system as claimed in claim 1, wherein: The driving assembly comprises a first bevel gear (63) coaxially connected with the reciprocating wire rod (6), the flue gas guiding pipe (1) is rotationally connected with a second bevel gear (151) engaged with the first bevel gear (63), the second bevel gear (151) is coaxially connected with a rotating shaft (15), the rotating shaft (15) extends to outside of the flue gas guiding pipe (1), and the flue gas guiding pipe (1) is provided with a driving piece for driving the rotating shaft (15) to rotate.

3. The dual alkali desulphurization process flue gas treatment system as claimed in claim 1, wherein: The inner wall of the dustproof groove (81) is embedded with a plurality of rolling balls (811), and the rolling balls (811) are attached to the dustproof block (8).

4. The dual alkali desulphurization process flue gas treatment system as claimed in claim 3, wherein: The ventilation pipe (171) extends to the meshing position of the first bevel gear (63) and the second bevel gear (151) away from the air blowing pipe (17).

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