A combined rake type soot blower and control method

Abstract

The present invention discloses a combined rake type soot blower and a control method, relating to the technical field of waste gas treatment. It solves the problems of resource waste and unstable operation existing in the rake type soot blower because the opening and closing states of the lifting valve are realized by mechanical impact. It includes: a first cylinder, which is arranged at one end of the frame and is used for enabling compressed air to enter the inner pipe when the lifting valve is opened; the inner pipe is arranged on one side of the frame, and the other end thereof extends into the outer pipe; a second cylinder, which is respectively connected with two clamping grooves and is used for driving the two clamping grooves to open and seal; the carriage is suspended under the frame through rollers; the PLC controller sequentially sends opening signals to the second cylinder, the first cylinder, the lifting valve and the carriage, so that when the second cylinder drives the two clamping grooves to open, the lifting valve, driven by the first cylinder, fills the inner pipe with compressed air; when the two clamping grooves are in an open state, the carriage drives the outer pipe to reciprocate along the inner pipe and spray out compressed air.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and more particularly to a combined rake type soot blower and a control method thereof. Background Art

[0002] As the core component of cement SCR denitration, the use effect of the rake type soot blower directly affects the use efficiency and service life of the catalyst, and even may cause the catalyst to be blocked due to poor soot blowing effect, resulting in the shutdown of the entire cement production line. At present, the rake type soot blower products on the market are transplanted from the supporting boilers and SCR denitration in the power industry, so there are certain disadvantages in use for the technological characteristics and flue gas properties of the cement industry.

[0003] In practical applications, since the supply of compressed air to the lift valve of the rake type soot blower relies on mechanical impact to achieve, it is impossible to realize the reasonable utilization and free adjustment control of compressed air during the spraying process, resulting in waste of resources; the mechanical switch has no signal transmission and cannot realize remote fault alarm, which brings inconvenience to daily maintenance and repair. The lift valve can only be opened by hitting the crank connecting rod mechanism after the carriage moves, and there is always an idle stroke, resulting in some catalysts not being sprayed, affecting the denitration efficiency.

[0004] In summary, the existing rake type soot blower has problems of resource waste and unstable operation because the opening and closing state of the lift valve relies on mechanical impact. Summary of the Invention

[0005] An embodiment of the present invention provides a combined rake type soot blower and a control method, which can freely control the opening and closing state of the lift valve, ensure the stable operation of the rake type soot blower, and avoid the problem of resource waste at the same time.

[0006] An embodiment of the present invention provides a combined rake type soot blower, including:

[0007] A first cylinder, which is arranged at one end of the frame and is connected to a lift valve arranged at one end of the inner pipe, and is used for allowing compressed air to enter the inner pipe when the lift valve is opened;

[0008] The inner pipe is arranged on one side of the frame, and the other end thereof extends into the outer pipe;

[0009] A second cylinder, which is arranged at the other end of the frame and is respectively connected to two card slots, and is used for driving the two card slots to open and close hermetically;

[0010] A carriage, which is suspended under the frame through rollers, and an outer pipe connected to the carriage is arranged on the inner pipe;

[0011] The PLC controller sends opening signals to the second cylinder, the first cylinder, the lifting valve and the carriage in sequence, so that when the second cylinder drives the two chucks to open, the lifting valve is driven by the first cylinder to allow compressed air to enter the inner tube; when the two chucks are in the open state, the carriage reciprocates along the frame, driving the outer tube to reciprocate along the inner tube and eject compressed air.

[0012] Furthermore, it also includes a pressing plate assembly;

[0013] A dovetail notch is formed at the tail of the frame. The cylinder is located within the dovetail notch. The lifting valve is fixed to one side of the dovetail notch. The piston rod of the cylinder is connected to the lifting valve through the pressing plate assembly.

[0014] Furthermore, the pressing plate assembly includes a Y-shaped joint, a pressing plate, and a return spring;

[0015] The first end of the Y-shaped joint is hinged to the piston rod of the cylinder, the second end is hinged to one side of the lifting valve, and the third end is fixedly connected to one end of the pressing plate;

[0016] The other end of the pressing plate faces the start switch of the lifting valve;

[0017] The return spring is sleeved outside the pressing plate, and its lower end is connected to the lifting valve.

[0018] Furthermore, it also includes a negative pressure box, a flange, a sealing gasket, and a connecting rod;

[0019] Mounting holes are provided on the frame. The negative pressure box is arranged on the mounting holes through bolt shafts, and the negative pressure box can rotate around the bolt shafts;

[0020] The first end of the second cylinder is fixed above the negative pressure box through a second cylinder bracket. The second end of the second cylinder is connected to the first end of the connecting rod. The second end of the connecting rod is respectively connected to the protruding ends of the two chucks;

[0021] The connecting ends of the two chucks are arranged on one side of the negative pressure box, and a flange and a sealing gasket are sequentially arranged between the connecting ends of the two chucks and the negative pressure box.

[0022] Furthermore, it also includes a semi-circular sealing ring and a circular sealing ring;

[0023] The semi-circular sealing ring is arranged within the chuck. When the two chucks are closed, the semi-circular sealing rings are in contact with the outer surface of the outer tube. The inner annular arc surface of the chuck near the negative pressure box side is in contact with the circular sealing ring arranged on the side of the flange away from the negative pressure box.

[0024] Further, the two card slots are U-shaped card slots. When the two U-shaped card slots are closed, a round hole is formed.

[0025] When the two U-shaped card slots are closed, the outer tube penetrates through the round hole, and the outer surface of the outer tube is in contact with the semi-circular sealing ring.

[0026] Further, it further includes a spring compensator, a stuffing box, a stuffing compression flange, packing, and an inner tube bushing.

[0027] The inner tube bushing and the packing are sequentially arranged in the stuffing box from inside to outside.

[0028] The annular retaining ring is arranged outside the packing, and the stuffing compression flange is arranged outside the stuffing box for sealing the stuffing box.

[0029] The spring compensator is also arranged between the stuffing compression flange and the annular retaining ring.

[0030] Further, it further includes a stuffing box gland and a carriage.

[0031] The stuffing box is embedded in the carriage and is fixed in the carriage through the stuffing box gland.

[0032] Further, a boss is arranged on one side of the annular retaining ring away from the packing, and the boss is used for arranging the spring compensator.

[0033] A boss is arranged on one side of the stuffing compression flange close to the spring compensator, and the boss is used for arranging the spring compensator.

[0034] The embodiment of the present invention also provides a control method for a combined rake type soot blower, including:

[0035] When the PLC controller controls the second cylinder to move perpendicular to the negative pressure box and towards the negative pressure box, the connecting rod connected to the second end of the second cylinder drives the two card slots to rotate. When it reaches the open state, it controls the first cylinder to drive the lifting valve to open, so that compressed air enters the inner tube. When it controls the carriage to reciprocate along the frame, the compressed air enters the set area through the inner tube and the outer tube and ejects the compressed air.

[0036] When the PLC controller receives the closing signal of the limit switch, it controls the first cylinder to drive the lifting valve to close, and the compressed air stops entering the inner tube. When it controls the second cylinder to move perpendicular to the negative pressure box and away from the negative pressure box, the connecting rod drives the two card slots to rotate, so that the two card slots reach the closed state.

[0037] An embodiment of the present invention provides a combined rake type soot blower and a control method, including: a first cylinder, which is arranged at one end of a frame and is connected to a lift valve arranged at one end of an inner pipe, and is used for enabling compressed air to enter the inner pipe when the lift valve is opened; the inner pipe is arranged on one side of the frame, and the other end thereof extends into an outer pipe; a second cylinder, which is arranged at the other end of the frame and is respectively connected to two card slots, and is used for driving the two card slots to open and seal; a carriage, which is suspended under the frame through rollers, and the outer pipe connected to the carriage is arranged on the inner pipe; the PLC controller sequentially sends opening signals to the second cylinder, the first cylinder, the lift valve and the carriage, so that when the second cylinder drives the two card slots to open, the lift valve is driven by the first cylinder, so that compressed air enters the inner pipe; when the two card slots are in an open state, the carriage reciprocates along the frame, driving the outer pipe to reciprocate along the inner pipe and eject compressed air. This type of soot blower adopts a pneumatic (electric) control structure. By controlling the PLC to sequentially send opening signals to the second cylinder, the first cylinder, the lift valve and the carriage, the opening and closing of the lift valve can be controlled, reducing the loss of compressed air and shortening the overall purging cycle; avoiding the problem that the opening and closing failure of the lift valve during the long-term operation of the rake type soot blower affects the purging performance and thus causes waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 Structural schematic diagram of the combined rake type soot blower provided by the embodiment of the present invention;

[0040] Figure 2 Structural schematic diagram of the controllable lift valve control mechanism provided by the embodiment of the present invention;

[0041] Figure 3 Structural schematic diagram of the lift valve, the first cylinder and the pressing plate assembly provided by the embodiment of the present invention;

[0042] Figure 4 Structural schematic diagram of the carriage drive mechanism provided by the embodiment of the present invention;

[0043] Figure 5 Structural schematic diagram of the annular retaining ring provided by the embodiment of the present invention;

[0044] Figure 6Schematic diagram of the packing compression flange structure provided by the embodiment of the present invention;

[0045] Figure 7 Schematic diagram of the structure of the negative pressure box mechanism provided by the embodiment of the present invention;

[0046] Figure 8 Schematic diagram of the structure of the card slot in the open state provided by the embodiment of the present invention;

[0047] Figure 9 Schematic diagram of the structure of the card slot in the closed state provided by the embodiment of the present invention;

[0048] Figure 10 Schematic diagram of the sealing structure of the negative pressure box mechanism provided by the embodiment of the present invention;

[0049] Figure 11 Schematic diagram of the flow of the control method of the combined rake type soot blower provided by the embodiment of the present invention;

[0050] Among them, 1~Controllable lift valve control mechanism; 1-2 First cylinder; 1-3 Pressure plate assembly; 1-4 Lift valve;

[0051] 2~Carriage drive mechanism; 2-1~Packing compression flange; 2-2~Spring compensator; 2-3~Circular retaining ring; 2-4~First sealing packing; 2-5~Second sealing packing; 2~6~Inner pipe bushing; 2-7~Packing chamber; 2-8~Packing chamber gland; 2-9~Carriage; 2-11~Bolt.

[0052] 3~Negative pressure box structure mechanism; 3-1~Negative pressure box; 3-2~Sealing gasket; 3-3~Second cylinder bracket; 3-4~Second cylinder; 3-5~Flange; 3-6~Circular sealing ring; 3-7~Card slot; 3-8~Semicircular sealing ring; 3-9~Connecting rod;

[0053] 5~PLC controller;

[0054] 4~Inner and outer soot blowing pipes; 4-1~Inner pipe; 4-2~Outer pipe;

[0055] 6~Frame. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0057] In practical applications, the rake-type soot blower for denitration consists of several major components, including a frame, a lift valve structure, a carriage, inner and outer soot blowing pipes, a negative pressure box, etc. Among them, the lift valve structure is fixed to the frame by a crank connecting rod. The carriage is equipped with a striker and moves along the frame. When the carriage moves, it strikes the crank, causing the crank to rotate, pulling the connecting rod to drive the pressing plate on the lift valve to press down, thus opening the lift valve. The opening and closing of the lift valve of the rake-type soot blower are related to the carriage. For one reciprocating motion of the carriage, the lift valve opens and closes once. When the carriage retracts, the lift valve cannot close. When using the rake-type soot blower in equipment, generally several sets of rake-type soot blowers are required to continuously blow and sweep in sequence every day. The rake-type soot blower has a high usage frequency. After long-term use, the striker on the carriage breaks, resulting in malfunctions of the rake-type soot blower.

[0058] Furthermore, the seal between the inner pipe and the carriage is composed of a guide bushing, sealing packing, a positioning sleeve, and a sealing packing compression flange. The inner pipe remains stationary, and the carriage and the sealing device move axially along the inner pipe. During the movement, the sealing packing remains in close contact and friction with the inner pipe to form a seal. Since the flue gas temperature processed by the denitration system is relatively high, in order to reduce the temperature drop of the system, the compressed air used in the rake-type soot blower has a high temperature. Due to the influence of the compressed air and equipment temperature, the inner pipe and the sealing material will thermally expand, and the expansion amounts are different, which will cause the extrusion pressure between the inner pipe and the sealing packing to increase, resulting in phenomena such as an increase in resistance or even jamming of the soot blower carriage during walking, affecting the use of the rake-type soot blower. When the phenomenon of the soot blower carriage jamming occurs during the use of the rake-type soot blower, only by manually adjusting the nut on the compression flange can the problem of the carriage jamming be alleviated, and there may be associated failures due to untimely maintenance.

[0059] Furthermore, the seal between the outer pipe and the denitration shell is composed of four 1 / 4 circular card slots, a graphite packing seal strip, and a spring. The graphite packing seal strip is installed in the card slot, and the four 1 / 4 circular card slots form a complete circle by a circular spring. This structure is a sealing component and is installed in the negative pressure box. When ensuring the axial movement of the outer pipe with the soot blower carriage, the graphite packing seal strip can fit on the outer wall of the outer pipe, thus realizing the sealing function. The flue gas temperature processed by the denitration system is relatively high. The denitration equipment shell expands when heated. Coupled with the installation error of the rake-type soot blower itself, there will be a certain degree of deviation in the coaxiality between the outer pipe of the soot blower and the rake pipe. This deviation will cause the plane of the graphite packing seal strip of the sealing component in the negative pressure box not to be perpendicular to the outer pipe, and there will be a certain gap between it and the outer pipe, resulting in air leakage of the equipment. The sealing component in the negative pressure box is connected to the negative pressure box by two bolts, without considering the seal between the negative pressure wall and the sealing component, and air leakage of the denitration shell will also occur here.

[0060] To solve the above problems existing in the rake-type soot blower, an embodiment of the present invention provides a combined rake-type soot blower, which can freely control the opening and closing state of the lift valve, ensure the stable operation of the rake-type soot blower, avoid the problem of resource waste, and also avoid the problem of air leakage due to poor sealing effect.

[0061] Figure 1 An exemplary structural schematic diagram of the combined rake-type soot blower provided by the embodiment of the present invention is shown, as Figure 1 shown. The combined rake-type soot blower mainly includes: a controllable lift valve control mechanism 1, a trolley drive mechanism 2, a negative pressure box structure mechanism 3, a frame 6, a PLC controller 5, and an inner and outer soot blowing pipe 4.

[0062] Among them, the controllable lift valve control mechanism 1 mainly includes a first cylinder 1-2 and a lift valve 1-4; specifically, the first cylinder 1-2 is arranged at one end of the frame 6, and the first cylinder 1-2 is connected to the lift valve 1-4; the lift valve 1-4 is arranged at one end of the frame 6 and is fixedly connected to the frame 6, and the lift valve 1-4 is connected to one end of the inner pipe 4-1. The first cylinder 1-2 is used to control the opening and closing of the lift valve 1-4. When the first cylinder 1-2 controls the lift valve 1-4 to open, compressed air can enter the inner pipe 4-1.

[0063] It should be noted that in the embodiment of the present invention, the inner and outer soot blowing pipe 4 includes an inner pipe 4-1 and an outer pipe 4-2, and the diameter of the inner pipe 4-1 is smaller than the inner wall diameter of the outer pipe 4-2. One end of the inner pipe 4-1 is arranged on one side of the frame 6, and the lift valve 1-4 controls the air inlet of the inner pipe 4-1. Specifically, one end of the inner pipe 4-1 is provided with a keyway and a thread, and is connected to the side flange of the lift valve 1-4 through a flange, and the connection part between one end of the inner pipe 4-1 and the lift valve 1-4 has good sealing performance; there is an opening below the lift valve 1-4 connected to the compressed air pipeline, and the side opening of the lift valve 1-4 is connected to the inner pipe 4-1 through a flange. When the lift valve 1-4 opens, compressed air enters the inner pipe 4-1 through the lift valve 1-4. When the lift valve 1-4 closes, compressed air cannot enter the lift valve 1-4. Further, the other end of the inner pipe 4-1 extends into the outer pipe 4-2. In order to reduce the friction between the inner pipe 4-1 and the outer pipe 4-2, the outer surface of the inner pipe 4-1 is smooth, and the outer surface of the outer pipe 4-2 is provided with an oil coating.

[0064] Further, the sports car driving mechanism 2 includes a sports car 2-9. The upper end of the sports car 2-9 is suspended on the lower flange plate of the frame 6 through rollers and can reciprocate along the frame 6. The outer pipe 4-2 is fixed to the sports car 2-9 through a flange. Since the other end of the inner pipe 4-1 extends into the outer pipe 4-2, when the sports car 2-9 reciprocates along the frame 6, it can drive the outer pipe 4-2 to reciprocate along the inner pipe 4-1. When the outer pipe 4-2 enters the set container, the compressed air in the inner pipe 4-1 will also enter the set container, thus completing soot blowing.

[0065] Further, the negative pressure box structure mechanism 3 mainly includes a second cylinder 3-4 and two clamping slots 3-7. The second cylinder 3-4 is arranged at the other end of the frame 6. The second cylinder 3-4 is respectively connected to the two clamping slots 3-7 and is used to drive the two clamping slots 3-7 to be in an open state through a pin shaft when the cylinder is opened, and drive the two clamping slots 3-7 to be closed and form a sealed closure through a pin shaft when the cylinder is closed.

[0066] The combined rake soot blower provided by the embodiment of the present invention uses a pneumatic (electric) control structure (such as a cylinder, an electric valve) to replace the original mechanical structure (crank connecting rod). Through PLC program control, the opening and closing of the lifting valve 1-4 can be controlled, so as to reasonably control the compressed air and freely adjust the soot blowing cycle according to the working conditions. By setting open-in-place and close-in-place signal switches on the cylinder, the remote real-time monitoring of the switch state of the lifting valve 1-4 can be realized, ensuring the stable operation of the rake soot blower. Specifically, the PLC controller 5 is electrically connected to the first cylinder 1-2, the lifting valve 1-4, the second cylinder 3-4 and the sports car 2-9 respectively, and sends opening signals to the second cylinder 3-4, the first cylinder 1-2, the lifting valve 1-4 and the sports car 2-9 in sequence. When the second cylinder 3-4 receives the opening signal, the second cylinder 3-4 drives the two clamping slots 3-7 to open. When the two clamping slots 3-7 are opening, the first cylinder 1-2 receives the opening signal, and the opening of the first cylinder 1-2 drives the lifting valve 1-4 to open. When the lifting valve 1-4 opens, compressed air rushes into the inner pipe 4-1; when the compressed air in the inner pipe 4-1 meets the blowing requirement, the sports car 2-9 receives the opening signal, and the sports car 2-9 drives the outer pipe 4-2 to travel on the inner pipe 4-1 in the direction of the second cylinder 3-4; when the sports car 2-9 drives the outer pipe 4-2 to just start traveling on the inner pipe 4-1, the second cylinder 3-4 just drives the two clamping slots 3-7 to complete the opening, that is, at the moment when the two clamping slots 3-7 are in an open state, the sports car 2-9 drives the outer pipe 4-2 to start traveling on the inner pipe 4-1 and starts to spray compressed air.

[0067] The control method of the combined rake type soot blower provided by the embodiment of the present invention realizes the controllable opening and closing of the lifting valve 1-4 through the PLC controller 5, so as to reasonably control the compressed air and freely adjust the soot blowing cycle according to the working conditions; by setting open-in-place and close-in-place signal switches on the first cylinder 1-2, the remote real-time monitoring of the switch state of the lifting valve 1-4 can be realized to ensure the stable operation of the rake type soot blower; by setting the action logic sequence of the lifting valve 1-4 and the carriage 2-9 through the PLC controller 5, the lifting valve 1-4 is opened first before the carriage 2-9 is started, effectively solving the problem of the empty stroke of purging.

[0068] In order to introduce the combined rake type soot blower and the control method of the combined rake type soot blower provided by the embodiment of the present invention in more detail, the following successively introduces several main components included in the rake type soot blower and the PLC control method based on the above several components. Specifically, the rake type soot blower mainly includes a controllable lifting valve control mechanism 1, a carriage driving mechanism 2, and a negative pressure box structure mechanism 3.

[0069] Figure 2 It is a schematic structural diagram of the controllable lifting valve control mechanism provided by the embodiment of the present invention. Figure 3 It is a schematic structural diagram of the lifting valve, the first cylinder and the pressing plate assembly provided by the embodiment of the present invention; the following combines Figures 1 to 3 to introduce the controllable lifting valve control mechanism 1 in detail.

[0070] The controllable lifting valve control mechanism 1 mainly includes a second cylinder 3-4, a pressing plate assembly 1-3 and a lifting valve 1-4. Among them, the first cylinder 1-2 is hinged to one end of the frame 6, and the cylinder rod of the first cylinder 1-2 is connected to the lifting valve 1-4 through the pressing plate assembly 1-3. Correspondingly, the carriage driving mechanism 2 is arranged on the inner and outer soot blowing pipes 4 on the lower side of the frame 6. In practical applications, the PLC controller 5 is electrically connected to the first cylinder 1-2, the lifting valve 1-4 and the carriage driving mechanism 2 respectively.

[0071] Furthermore, a dovetail-shaped notch is opened at the tail of the frame 6. The first cylinder 1-2 is located in the dovetail-shaped notch at one end of the frame 6, and the tail of the first cylinder 1-2 is connected to the inner convex plate of the dovetail-shaped notch; the lifting valve 1-4 is fixed on one side of the dovetail-shaped notch.

[0072] Specifically, the pressing plate assembly 1-3 includes a Y-shaped joint, a pressing plate and a return spring. Among them, the first end of the Y-shaped joint is hinged to the cylinder rod of the first cylinder 1-2, the second end is hinged to one side of the lifting valve 1-4, and the third end is fixedly connected to one end of the pressing plate; the other end of the pressing plate faces the start switch of the lifting valve 1-4, and the return spring is sleeved outside the pressing plate, and the lower end of the return spring is fixedly connected to the lifting valve 1-4.

[0073] In practical applications, the first cylinder 1-2 is controlled by the PLC controller 5. The opening time of the lifting valve 1-4 is about 3 seconds earlier than the starting time of the carriage 2-9. When the PLC controller 5 controls the first cylinder 1-2 to open, the cylinder rod contracts, drives the pressing plate to rotate and press down through the Y-joint. During this process, the first cylinder 1-2 also rotates downward simultaneously through the connection with the end convex plate of the frame 6. The rotation and downward pressing of the pressing plate drive the opening of the lifting valve 1-4. About 3 seconds after the lifting valve 1-4 opens, the carriage 2-9 starts and begins the purging operation.

[0074] When the carriage 2-9 travels to the other end of the frame 6, the carriage 2-9 returns along the original path. At this time, the PLC controller 5 controls the cylinder to close, the cylinder rod extends, drives the pressing plate to rotate and lift through the Y-joint. During this process, the first cylinder 1-2 also rotates upward and resets simultaneously through the connection with the end convex plate of the frame 6.

[0075] Figure 4 Schematic diagram of the structure of the carriage drive mechanism provided by the embodiment of the present invention Figure 5 Schematic diagram of the structure of the annular retaining ring provided by the embodiment of the present invention Figure 6 Schematic diagram of the structure of the packing compression flange provided by the embodiment of the present invention. The following combines Figure 1 、 Figures 4 to 6 to introduce the carriage drive mechanism 2 in detail.

[0076] The carriage drive mechanism 2 provided by the embodiment of the present invention aims to enable the rake type soot blower to automatically adjust the expansion amount caused by thermal expansion during operation, and at the same time ensure the sealing between the carriage 2-9 and the inner pipe 4-1 included in the inner and outer soot blowing pipes 4.

[0077] Specifically, the carriage drive mechanism 2 is mainly used for the rake type soot blower in the cement denitration system, and mainly includes: a spring compensator 2-2, a stuffing box 2-7, a packing compression flange 2-1, a sealing packing, an annular retaining ring 2-3 and an inner pipe bushing 2-6.

[0078] Among them, the inner pipe bushing 2-6 and the sealing packing are arranged in the stuffing box 2-7 in sequence. The inner pipe bushing 2-6 is used to position the sealing packing filled in the stuffing box 2-7. Further, the annular retaining ring 2-3 is arranged outside the sealing packing, and the packing compression flange 2-1 is arranged on the outside of the stuffing box 2-7 for sealing the stuffing box 2-7. In the embodiment of the present invention, in order to enable the packing compression flange 2-1 to press the annular retaining ring 2-3, preferably, a spring compensator 2-2 is further arranged after the packing compression flange 2-1 and the annular retaining ring 2-3.

[0079] In practical applications, in order to prevent the compression spring compensator 2-2 from slipping off from behind the packing clamping flange 2-1 and the annular retaining ring 2-3 during use, preferably, a boss is provided on the side of the annular retaining ring 2-3 away from the sealing packing, and a boss is also provided on the side of the packing clamping flange 2-1 close to the sealing packing. Through the above two bosses, the compression spring compensator 2-2 can be fixed between the packing clamping flange 2-1 and the annular retaining ring 2-3.

[0080] Furthermore, the packing clamping flange 2-1 compresses the annular retaining ring 2-3 through the compression spring compensator 2-2, so that there is a certain compression effect between the annular retaining ring 2-3 and the sealing packing. When the sealing packing and the inner tube 4-1 arranged on the inner side of the packing chamber 2-7 expand at high temperature, the compression spring compensator 2-2 can adjust the compression state of the sealing packing through the spring force. At the same time, the spring force of the compression spring compensator 2-2 acts evenly on the sealing packing through the annular retaining ring 2-3, thereby ensuring the structural flatness of the sealing packing and the seal between the sealing packing and the inner tube 4-1, and avoiding the jamming of the sports car 2-9 caused by excessive extrusion caused by thermal expansion of the sealing packing and the inner tube 4-1.

[0081] In practical applications, when the compression spring compensator 2-2 is arranged between the annular retaining ring 2-3 and the packing clamping flange 2-1, it can be ensured that the compression spring compensator 2-2 and the inner tube 4-1 that penetrates the packing chamber 2-7 are coaxially arranged, thereby avoiding the friction generated by the contact between the compression spring compensator 2-2 and the inner tube 4-1. At least four grooves are evenly arranged around the packing clamping flange 2-1. By arranging bolts 2-11 on the grooves, the force of the packing clamping flange 2-1 can be uniformly applied to the compression spring compensator 2-2. Furthermore, the annular retaining ring 2-3 can evenly disperse the spring force of the compression spring compensator 2-2 on the sealing packing on the other side of the annular retaining ring 2-3.

[0082] In the embodiment of the present invention, the stuffing chamber 2-7 needs to be embedded in the sports car 2-9. In order to prevent the stuffing chamber 2-7 from shaking in the sports car 2-9, preferably, the stuffing chamber 2-7 is fixed in the sports car 2-9 by a stuffing chamber pressure cover 2-8.

[0083] In an embodiment of the present invention, the sealing filler arranged in the filler chamber 2-7 includes at least two layers, for example, a first sealing filler 2-4 and a second sealing filler 2-5; if the number of the sealing filler includes multiple layers, it is necessary to ensure that the materials of two adjacent layers of sealing filler are different.

[0084] The driving mechanism 2 of the sports car can automatically absorb the expansion amount of the sealing packing under the action of thermal expansion by arranging a spring compensator 2-2 between the packing compression flange 2-1 and the sealing packing, so that the extrusion force between the inner pipe 4-1 and the sealing packing is basically constant, avoiding the jamming of the sports car 2-9 caused by the increase in the pressure between the two. By arranging an annular retaining ring 2-3 between the spring compensator 2-2 and the sealing packing, the spring force is balanced, so that it can act on the sealing packing evenly, avoiding the deformation of the sealing packing caused by uneven force. The driving mechanism 2 of the sports car solves the problem that in the existing rake type soot blower for denitration, due to the high temperature of the use environment, the extrusion pressure between the inner pipe 4-1 of the soot blower and the sealing packing is likely to become larger, resulting in an increase in the resistance and even jamming of the sports car 2-9 of the soot blower during walking.

[0085] Figure 7 Schematic structural diagram of the negative pressure box structure mechanism provided by an embodiment of the present invention Figure 8 Schematic structural diagram of the open state of the clamping groove provided by an embodiment of the present invention Figure 9 Schematic structural diagram of the closed state of the clamping groove provided by an embodiment of the present invention Figure 10 Schematic structural diagram of the sealing structure of the negative pressure box structure mechanism provided by an embodiment of the present invention; The following combines Figure 1 、 Figures 7 to 10 to introduce the negative pressure box structure mechanism 3 in detail.

[0086] The negative pressure box structure mechanism 3 mainly includes: a sealing component, a negative pressure box 3-1 and a second cylinder 3-4.

[0087] Specifically, the sealing component includes a sealing gasket 3-2, a flange 3-5, a sealing ring 3-6, a clamping groove 3-7, a semi-circular sealing ring 3-6, etc. Among them, the sealing gasket 3-2 and the flange 3-5 are fixed on one side of the negative pressure box 3-11, and the sealing gasket 3-2 is located between the flange 3-5 and the negative pressure box 3-1. By arranging the sealing gasket 3-2 between the flange 3-5 and the negative pressure box 3-1, the sealing problem between the negative pressure box 3-1 and the flange 3-5 can be ensured, thus solving the problem of air leakage between the negative pressure box 3-1 and the flange 3-5.

[0088] In this embodiment, the negative pressure box 3-1 is arranged on the frame 6. Among them, an installation hole is arranged at one end of the frame 6 far from the controllable lifting valve control mechanism 1, and both ends of the negative pressure box 3-1 are arranged on the installation hole through a bolt 2-11 shaft, so that it can be arranged on the frame 6. Further, since the negative pressure box 3-1 is arranged on the installation hole through the bolt 2-11 shaft, the negative pressure box 3-1 can rotate around the bolt 2-11 shaft.

[0089] Further, the first end of the second cylinder 3-4 is arranged above the negative pressure box 3-1 through the second cylinder frame 3-3. The second end of the second cylinder 3-4 is fixedly connected to the first end of the connecting rod 3-9. The second end of the connecting rod 3-9 is respectively connected to the protruding ends of the two clamping grooves 3-7. The second cylinder frame 3-3 is arranged on the negative pressure box 3-1, which can ensure that the connecting rod 3-9 can reciprocate perpendicular to the negative pressure box 3-1. In the embodiment of the present invention, when the connecting rod 3-9 reciprocates perpendicular to the negative pressure box 3-1, since the second end of the connecting rod 3-9 is respectively connected to the protruding ends of the two clamping grooves 3-7, the two clamping grooves 3-7 can be driven to operate, thereby realizing the opening and closing of the clamping grooves 3-7.

[0090] Further, the connecting ends of the two clamping grooves 3-7 are arranged on one side of the negative pressure box 3-1 through a pin shaft, that is, the two clamping grooves 3-7 can rotate around the pin shaft. In the embodiment of the present invention, a flange plate 3-5 and a sealing gasket 3-2 are also arranged between the two clamping grooves 3-7 and the negative pressure box 3-1, that is, the two clamping grooves 3-7 and the flange plate 3-5 are both arranged on the same side of the negative pressure box 3-1. Among them, the inner annular arc on the side of the two clamping grooves 3-7 close to the negative pressure box 3-1 is in contact with the circular sealing ring 3-6 arranged on the side of the flange plate 3-5 away from the negative pressure box 3-1. Through this setting, when the two clamping grooves 3-7 are closed, the two clamping grooves 3-7 can be in complete contact with the circular sealing ring 3-6, realizing the sealing between the clamping grooves 3-7 and the negative pressure box 3-1.

[0091] It should be noted that in order to be able to arrange the circular sealing ring 3-6 on the side of the flange plate 3-5 away from the negative pressure box 3-1, preferably, a boss is arranged on the flange plate 3-5, through which the circular sealing ring 3-6 can be conveniently arranged.

[0092] Further, a semi-circular sealing ring 3-8 is arranged inside the clamping groove 3-7, that is, a semi-circular sealing ring 3-8 is arranged inside each clamping groove 3-7. Since the connecting ends of the two clamping grooves 3-7 are arranged on one side of the negative pressure box 3-1 and the protruding ends of the two clamping grooves 3-7 are respectively connected to the second end of the connecting rod 3-9, when the cylinder reciprocates perpendicular to the negative pressure box 3-1, the protruding ends of the two clamping grooves 3-7 will drive the two clamping grooves 3-7 to open or close accordingly, that is, the opening and closing of the clamping grooves 3-7 are realized.

[0093] In the embodiment of the present invention, both of the two card slots 3-7 are U-shaped card slots. The connecting ends of the two U-shaped card slots are arranged on the negative pressure box 3-1, and the protruding ends of the two U-shaped card slots are connected to the second end of the connecting rod 3-9. When the two U-shaped card slots are closed driven by the connecting rod 3-9, a circular hole is formed by the two U-shaped card slots. Further, the outer surface of the outer tube 4-2 passing through the circular hole will be in contact with the semi-circular sealing rings 3-8 arranged on the inner sides of the U-shaped card slots. Through this setting, when the two U-shaped card slots are closed, the outer surface of the outer tube 4-2 can be bent to be in contact with the bending of the two semi-circular sealing rings 3-8, thereby improving the sealing performance between the card slot 3-7 and the outer tube 4-2, and avoiding the problem of air leakage in the seal between the outer tube 4-2 and the pin removal housing.

[0094] The sealing gasket 3-2 added between the flange 3-5 and the negative pressure box 3-1 in the negative pressure box structure mechanism 3 can ensure the sealing problem between the negative pressure box 3-1 and the sealing component, and solve the problem of air leakage between the negative pressure box 3-1 and the sealing component. Moreover, the opening and closing states of the card slot 3-7 can be realized through the movement of the air cylinder. A semi-circular sealing ring 3-8 is arranged in the card slot 3-7, and a circular sealing ring 3-6 is arranged on the surface where the inner annular arc surface of the card slot 3-7 close to the negative pressure box 3-1 contacts the flange ring, thereby solving the problem of air leakage in the seal between the outer tube 4-2 and the pin removal housing when the rake type soot blower stops working. Further, through this setting, the service life of the sealing strip can be prolonged.

[0095] The combined rake type soot blower control method provided by the embodiment of the present invention mainly controls the first air cylinder 1-2, the second air cylinder 3-4, the lift valve 1-4 and the trolley 2-9 through the PLC controller 5 to freely control the on-off state of the lift valve 1-4, ensure the stable operation of the rake type soot blower, and at the same time solve the problem of air leakage caused by sealing defects. Figure 11 It is a schematic flow chart of the combined rake type soot blower control method provided by the embodiment of the present invention. The following combines Figure 11 to introduce the combined rake type soot blower control method.

[0096] As Figure 11 shown, the control method of the combined rake type soot blower includes the following steps:

[0097] In step 101, when the PLC controller 5 controls the second cylinder 3-4 to move perpendicular to the negative pressure box 3-1 and towards the negative pressure box 3-1, the connecting rod 3-9 connected to the second end of the second cylinder 3-4 drives the two clamping grooves 3-7 to rotate. When the two clamping grooves 3-7 are in the opening process, the PLC controller 5 controls the first cylinder 1-2 to open, and the cylinder rod of the first cylinder 1-2 contracts, driving the pressing plate to rotate and press down through the Y-shaped joint. During this process, the first cylinder 1-2 also rotates downward simultaneously through its connection with the end convex plate of the frame 6. The rotation and downward pressing of the pressing plate drive the opening of the lifting valve 1-4. When the lifting valve 1-4 opens, compressed air enters the inner tube 4-1. After the lifting valve 1-4 has been open for about 3 seconds, the compressed air in the inner tube 4-1 reaches the required level, and the PLC controller 5 controls the trolley 2-9 to start. When the trolley 2-9 travels along the frame 6 towards the negative pressure box structure mechanism 3, it also drives the outer tube 4-2 to travel along the inner tube 4-1 towards the negative pressure box structure mechanism 3. When the trolley 2-9 drives the outer tube 4-2 to travel along the inner tube 4-1 towards the negative pressure box structure mechanism 3, the two clamping grooves 3-7 have reached the open state. When the trolley 2-9 drives the outer tube 4-2 to travel along the inner tube 4-1 towards the negative pressure box structure mechanism 3, the compressed air passes through the inner tube 4-1 and the outer tube 4-2 and enters the container to be cleaned, that is, the rake type soot blower starts to work.

[0098] It should be noted that after the trolley 2-9 drives the outer tube 4-2 to complete a single stroke on the inner tube 4-1 along the frame 6, that is, when the trolley 2-9 drives the outer tube 4-2 to travel along the inner tube 4-1 towards the negative pressure box structure mechanism 3, if the lifting valve 1-4 continues to open and compressed air continues to rush into the inner tube 4-1, the trolley 2-9 can continue to drive the outer tube 4-2 for a return trip. In this case, the second cylinder 3-4 still drives the two clamping grooves 3-7 to be in the open state. If the lifting valve 1-4 is closed and the compressed air stops rushing into the inner tube 4-1, the trolley 2-9 needs to stay in the initial position. In this case, when the PLC controls the second cylinder 3-4 to move perpendicular to the negative pressure box 3-1 and away from the negative pressure box 3-1, the connecting rod 3-9 drives the two clamping grooves 3-7 to rotate until the two clamping grooves 3-7 are in the closed state. At this time, the semi-circular density ring inside the clamping groove 3-7 contacts the outer surface of the outer tube 4-2 passing through the clamping groove 3-7, and the inner annular arc surface on the side of the clamping groove 3-7 close to the negative pressure box 3-1 contacts the circular sealing ring 3-6 on the flange 3-5.

[0099] In step 102, when the sports car 2-9 drives the outer tube 4-2 along the frame 6 to complete a single stroke on the inner tube 4-1, that is, the sports car 2-9 drives the outer tube 4-2 to move along the inner tube 4-1 toward the negative pressure box structure 3, that is, the lifting valve 1-4 and the first cylinder 1-2 remain in the open state, that is, the lifting valve 1-4 remains open. After the sports car 2-9 returns to the starting position, the PLC receives the closing signal of the limit switch, controls the first cylinder 1-2 and the second cylinder 3-4 to close at the same time, and the compressed air stops entering the inner tube 4-1, the negative pressure box 3-1 and the denitrification shell are sealed, and the soot blowing of a single rake soot blower is completed.

[0100] Further, when the sports car 2-9 drives the outer tube 4-2 along the frame 6 to complete a single stroke on the inner tube 4-1, that is, the sports car 2-9 drives the outer tube 4-2 to move along the inner tube 4-1 toward the negative pressure box structure 3, if the PLC controls the first cylinder 1-2 of the No. 1 rake soot blower corresponding to the current sports car 2-9 to be closed, the lifting valve 1-4 is closed to disconnect the air source, and at the same time, the corresponding second cylinder 3-4 of the No. 2 rake soot blower is controlled, and the second cylinder 3-4 is opened, then the No. 2 rake soot blower starts the soot blowing process. After the runner 2-9 of the No. 1 rake soot blower stops for several seconds, the PLC controls the motor of the runner 2-9 to reverse, and the runner 2-9 starts to move back. During this process, the second cylinder 3-4 of the No. 1 rake soot blower remains in the open state, that is, the sealing device of the negative pressure box 3-1 of the No. 1 rake soot blower is in the open state. After the runner 2-9 returns to the starting position (that is, the runner 2-9 triggers the limit switch at the end of the lifting valve 1-4 on the frame 6), the PLC controls the second cylinder 3-4 of the No. 1 rake soot blower to close, and the negative pressure box 3-1 is sealed with the denitrification shell. At the same time, the PLC controls the motor of the runner 2-9 of the No. 1 rake soot blower to stop running. At this point, the No. 1 rake soot blower completes the soot blowing process, and the No. 2 rake soot blower has started the soot blowing process. The soot blowing processes of two or more rake soot blowers overlap in time, which can shorten the cleaning cycle, improve the cleaning efficiency, and save compressed air consumption.

[0101] In summary, the embodiment of the present invention provides a combined rake-type soot blower, comprising: a first cylinder, which is arranged at one end of the frame and is connected to a lifting valve arranged at one end of the inner pipe, and is used for enabling compressed air to enter the inner pipe when the lifting valve is opened; the inner pipe is arranged on one side of the frame, and the other end thereof extends into the outer pipe; a second cylinder, which is arranged at the other end of the frame and is respectively connected to two clamping grooves, and is used for driving the two clamping grooves to open and seal and close; a carriage, which is suspended under the frame through rollers, and the outer pipe connected to the carriage is arranged on the inner pipe; the PLC controller sequentially sends opening signals to the second cylinder, the first cylinder, the lifting valve and the carriage, so that when the second cylinder drives the two clamping grooves to open, the lifting valve is driven by the first cylinder to enable compressed air to enter the inner pipe; when the two clamping grooves are in an open state, the carriage reciprocates along the frame, driving the outer pipe to reciprocate along the inner pipe and eject compressed air. This rake-type soot blower adopts a pneumatic (electric) control structure, and sequentially sends opening signals to the second cylinder, the first cylinder, the lifting valve and the carriage through PLC control, realizing controllable opening and closing of the lifting valve, reducing the loss of compressed air, and shortening the overall purging cycle; avoiding the problem that the opening and closing failure of the lifting valve during the long-term operation of the rake-type soot blower affects the purging performance and thus causes waste of resources.

[0102] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0103] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A combined rake type soot blower, characterized in that, Comprising: A first cylinder, which is arranged at one end of the frame and is connected to a lifting valve arranged at one end of the inner tube, and is used for enabling compressed air to enter the inner tube when the lifting valve is opened; The inner tube is arranged on one side of the frame, and the other end thereof extends into the outer tube; A second cylinder, which is arranged at the other end of the frame and is respectively connected to two clamping grooves, and is used for driving the two clamping grooves to open and seal and close; A carriage, which is suspended under the frame through rollers, and an outer tube connected to the carriage is arranged on the inner tube; The PLC controller sequentially sends opening signals to the second cylinder, the first cylinder, the lifting valve and the carriage, so that when the second cylinder drives the two clamping grooves to open, the lifting valve is driven by the first cylinder to enable compressed air to enter the inner tube; when the two clamping grooves are in an open state, the carriage reciprocates along the frame, driving the outer tube to reciprocate along the inner tube and spray compressed air.

2. The combined rake type soot blower according to claim 1, characterized in that, It further comprises a pressing plate assembly; A dovetail notch is formed at the tail of the frame, the cylinder is located in the dovetail notch, the lifting valve is fixed on one side of the dovetail notch, and the cylinder rod of the cylinder is connected to the lifting valve through the pressing plate assembly.

3. The combined rake type soot blower according to claim 2, characterized in that, The pressing plate assembly comprises a Y-shaped joint, a pressing plate and a return spring; The first end of the Y-shaped joint is hinged to the cylinder rod of the cylinder, the second end is hinged to one side of the lifting valve, and the third end is fixedly connected to one end of the pressing plate; The other end of the pressing plate faces the start switch of the lifting valve; The return spring is sleeved outside the pressing plate, and the lower end thereof is connected to the lifting valve.

4. The combined rake type soot blower according to claim 1, characterized in that, It further comprises a negative pressure box, a flange, a sealing gasket and a connecting rod; Mounting holes are arranged on the frame, the negative pressure box is arranged on the mounting holes through bolt shafts, and the negative pressure box can rotate around the bolt shafts; The first end of the second cylinder is fixed above the negative pressure box through a second cylinder bracket, the second end of the second cylinder is connected to the first end of the connecting rod, and the second end of the connecting rod is respectively connected to the protruding ends of the two clamping grooves; The connecting ends of the two clamping grooves are arranged on one side of the negative pressure box, and a flange and a sealing gasket are sequentially arranged between the connecting ends of the two clamping grooves and the negative pressure box.

5. The combined rake-type soot blower according to claim 4, characterized in that It further comprises a semi-circular sealing ring and a circular sealing ring; The semi-circular sealing ring is arranged in the clamping groove. When the two clamping grooves are closed, the semi-circular sealing rings are in contact with the outer surface of the outer tube, and the inner annular arc surface of the clamping groove close to the negative pressure box is in contact with the circular sealing ring arranged on the side of the flange away from the negative pressure box.

6. The combined rake type soot blower according to claim 5, wherein, The two clamping grooves are U-shaped clamping grooves. When the two U-shaped clamping grooves are closed, a round hole is formed; When the two U-shaped clamping grooves are closed, the outer tube penetrates through the round hole, and the outer surface of the outer tube is in contact with the semi-circular sealing ring.

7. The combined rake type soot blower according to claim 1, characterized in that, It further comprises a compression spring compensator, a stuffing box, a stuffing pressing flange, a sealing packing and an inner tube bushing; The inner tube bushing and the sealing packing are sequentially arranged in the stuffing box from inside to outside; An annular retaining ring is arranged outside the sealing packing, and the stuffing pressing flange is arranged outside the stuffing box for sealing the stuffing box; A compression spring compensator is also provided between the packing compression flange and the annular retaining ring.

8. The combined rake type soot blower according to claim 7, characterized in that, It further includes a stuffing box gland and a carriage; The stuffing box is embedded in the carriage, and the stuffing box is fixed in the carriage by the stuffing box gland.

9. The combined rake type soot blower according to claim 7, characterized in that, A boss is provided on the side of the annular retaining ring away from the sealing packing, and the boss is used for arranging the compression spring compensator; A boss is provided on the side of the packing compression flange close to the compression spring compensator, and the boss is used for arranging the compression spring compensator.

10. A control method for a combined rake type soot blower, characterized in that, Comprising: When the PLC controller controls the second cylinder to move perpendicular to the negative pressure box and towards the negative pressure box, the connecting rod connected to the second end of the second cylinder drives the two chucks to rotate. When it reaches the open state, the first cylinder is controlled to drive the lift valve to open, so that compressed air enters the inner pipe. When the carriage is controlled to reciprocate along the frame, the compressed air passes through the inner pipe and the outer pipe and enters the set area and sprays out the compressed air; When the PLC controller receives the closing signal of the limit switch, it controls the first cylinder to drive the lift valve to close, and the compressed air stops entering the inner pipe. When the second cylinder is controlled to move perpendicular to the negative pressure box and away from the negative pressure box, the connecting rod drives the two chucks to rotate, so that the two chucks reach the closed state.

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