CN115597082A

CN115597082A - Energy-concerving and environment-protective air preheating equipment that is used for coal fired boiler

Info

Publication number: CN115597082A
Application number: CN202211300034.3A
Authority: CN
Inventors: 高媛; 张春成; 支建伟
Original assignee: Jilin Tongxin Thermal Group Co ltd
Current assignee: Jilin Tongxin Thermal Group Co ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-01-13

Abstract

The utility model provides an energy-concerving and environment-protective air preheating equipment that is used for coal fired boiler, relate to a preheating equipment, it is including the bottom plate, preheat the pipeline, keep off material piece and gas flow subassembly, the bottom plate top is connected with preheats the pipeline, it is equipped with the gas flow subassembly on the pipeline to preheat, it is connected with and keeps off the material piece to preheat pipeline left side lower part rotary type, still including the pressure manifold, baffle and flue gas guide plate, both sides all are connected with the baffle about preheating in the pipeline, evenly spaced intensive distribution has the pressure manifold between two baffles, all slidingly be connected with the flue gas guide plate between both sides about many pressure manifolds. When the air is heated by using the combusted boiler flue gas, the waste residue of the hot flue gas can be filtered out, and the heat in the waste residue is also used for heating the air, so that the utilization rate of the heat energy of the flue gas is increased.

Description

Energy-concerving and environment-protective air preheating equipment that is used for coal fired boiler

Technical Field

The invention relates to preheating equipment, in particular to energy-saving and environment-friendly air preheating equipment for a coal-fired boiler.

Background

When fuel is combusted through a coal-fired boiler, in order to accelerate the drying, ignition and combustion processes of the fuel in the boiler, ensure stable combustion in the boiler and improve the combustion efficiency, air before entering the boiler needs to be preheated to a certain temperature.

And for energy-concerving and environment-protective, the mode that the boiler air preheated usually preheats the air by the waste heat in the flue gas in the boiler afterbody flue, and can carry a large amount of high temperature dust waste residues in this kind of high temperature flue gas usually, current boiler air preheats the mode and can directly filter high temperature dust waste residue usually and get rid of, avoid high temperature dust waste residue to pile up for a long time and cause the jam to preheating equipment, or clear up in follow-up to the waste residue, lead to the operation process loaded down with trivial details, and this kind of high temperature waste residue also does not carry out fine recycle to all the other heats, lead to the waste of the energy easily.

Disclosure of Invention

In view of the above, the invention provides an energy-saving and environment-friendly air preheating device for a coal-fired boiler, which can recycle high-temperature dust and waste residues and increase the utilization rate of heat energy.

The technical scheme of the invention is as follows: the utility model provides an energy-concerving and environment-protective air preheating equipment that is used for coal fired boiler, including the bottom plate, preheat the pipeline, keep off material piece and gas flow subassembly, the bottom plate top is connected with preheating the pipeline, be equipped with the gas flow subassembly on preheating the pipeline, preheat pipeline left side lower part rotary type and be connected with the fender material piece, still including the pressure manifold, the baffle, the flue gas guide plate, waste residue blocking mechanism and waste residue waste heat utilization mechanism, preheat the interior upper and lower both sides of pipeline and all be connected with the baffle, evenly spaced intensive distribution has the pressure manifold between two baffles, pressure manifold upper portion passes the top baffle and communicates with each other with preheating the interior upper portion of pipeline, the pressure manifold lower part passes the below baffle and communicates with each other with preheating the interior lower part of pipeline, so that the gas below the lower side baffle can circulate to the top of upper and lower side baffle through the pressure manifold, all slidingly be connected with the flue gas guide plate between the upper and lower both sides of many pressure manifolds, have the damping between flue gas guide plate and the pressure manifold, two flue gas guide plates are located between two baffles respectively, be equipped with waste residue blocking mechanism on the gas flow subassembly, waste residue blocking mechanism is used for blocking high temperature waste residue in the boiler flue gas, waste residue utilization mechanism is equipped with waste residue on the blocking mechanism.

Further, the gas circulation subassembly is including air admission pipeline, air exhaust duct, flue gas admission pipeline and flue gas exhaust duct, preheat pipeline one side lower part intercommunication and have air admission pipeline and flue gas admission pipeline, flue gas admission pipeline is located air admission pipeline and below baffle top, so that the flue gas that gets into in the flue gas admission pipeline can be located between the both sides baffle, preheat pipeline opposite side upper portion and be connected with air exhaust duct and flue gas exhaust duct, flue gas exhaust duct is located air exhaust duct and top baffle below.

Furthermore, a gap is formed between one side of the upper flue gas guide plate and the preheating pipeline, a gap is also formed between the other side of the lower flue gas guide plate and the preheating pipeline, and a flue gas circulation channel is formed by the gap between the flue gas guide plate and the preheating pipeline and the space inside the preheating pipeline, so that the flue gas circulation distance is prolonged, and the flue gas circulation time is prolonged.

Further, waste residue block mechanism blocks the framework including the waste residue, the screen cloth, admission line and stripper, the intercommunication has the waste residue to block the framework between air admission pipeline and the flue gas admission pipeline, the waste residue blocks one side that is close to the flue gas admission pipeline in the framework and is connected with the screen cloth, one side intercommunication that the waste residue blocks the framework and is close to the screen cloth has the admission line, the screen cloth is located between admission line and the flue gas admission pipeline, in order to get into the flue gas through the admission line, again filter the high temperature waste residue in the flue gas by the screen cloth, the waste residue blocks framework bottom sliding connection and has the stripper, be used for blocking the waste residue and discharge the waste residue.

Furthermore, the waste residue waste heat utilization mechanism comprises an air cylinder, a pushing frame, a material control plate and a heat conduction block, wherein the air cylinder is installed at the top of the waste residue blocking frame body, an expansion link of the air cylinder is in sliding fit with the waste residue blocking frame body, the pushing frame is connected onto the expansion link of the air cylinder and is in contact with the screen, so that the pushing frame moves to scrape off waste residues attached to the screen, the lower portion of the pushing frame is arranged in an inclined mode, so that waste materials can fall down from the inclined position of the pushing frame when the pushing frame moves downwards, the material control plate is connected into the waste residue blocking frame body and is also arranged in an inclined mode, the waste residues falling onto the material control plate are discharged to the lower portion of the pushing frame, and the heat conduction block is connected to the lower portion of the air inlet pipeline.

Further, still including vibration mechanism, vibration mechanism is including shock dynamo, support and blotter, and the waste residue blocks and installs shock dynamo in the framework for make the waste residue block the framework vibrations, with the waste residue discharge on the supplementary screen cloth, the support is installed near the position that the waste residue blockked the framework in bottom plate top, and the support top is connected with the blotter, and the blotter blocks the framework contact with the waste residue.

Furthermore, the preheating pipeline further comprises a moisture filtering frame, wherein the moisture filtering frame is arranged at the lower part in the preheating pipeline and is detachably arranged.

Further, the device comprises a cleaning mechanism, wherein the cleaning mechanism comprises a servo motor and a reciprocating screw rod, the servo motor is installed at the top of the preheating pipeline, the reciprocating screw rod is connected to an output shaft of the servo motor and consists of two reciprocating screw rods, the reciprocating screw rods are located in the preheating pipeline, and the two reciprocating screw rods are respectively in threaded connection with the upper smoke guide plate and the lower smoke guide plate so as to drive the two smoke guide plates to move through the rotation of the reciprocating screw rods.

The invention has the beneficial effects that:

1. when the air is heated by using the combusted boiler flue gas, the waste residue of the hot flue gas can be filtered out, and the heat in the waste residue is also used for heating the air, so that the utilization rate of the heat energy of the flue gas is increased.

2. According to the invention, the gap between the two flue gas guide plates and the preheating pipeline and the space inside the preheating pipeline form a flue gas circulation channel, so that the flue gas circulation distance is prolonged, the flue gas circulation time is prolonged, and the utilization rate of flue gas is improved.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a cross-sectional view of a preheat tube of the present invention.

FIG. 3 is a schematic view showing the connection relationship between the waste residue blocking mechanism and the waste residue heat utilizing mechanism of the present invention and other components.

Fig. 4 is a schematic diagram of a first three-dimensional structure of the waste residue blocking mechanism and the waste residue heat utilization mechanism of the present invention, wherein the waste residue blocking frame body is a cross-sectional view.

Fig. 5 is a schematic diagram of a second three-dimensional structure of the waste residue blocking mechanism and the waste residue heat utilization mechanism of the invention.

Fig. 6 is an exploded view of the moisture filtering frame and preheating duct of the present invention.

Fig. 7 is a schematic view of a first partial body structure of the vibration mechanism of the present invention.

Fig. 8 is a schematic view of a second partial body structure of the vibration mechanism of the present invention.

In the above drawings: 1_ bottom plate, 2_ preheating pipe, 21_ gauge block, 3_ air admission pipeline, 31_ air exhaust pipe, 4_ flue gas admission pipeline, 41_ flue gas exhaust pipe, 5_ pressure manifold, 6_ baffle, 7_ flue gas guide plate, 8_ waste residue blocking mechanism, 81_ waste residue blocking frame body, 82_ screen cloth, 83_ air intake pipe, 84_ stripper, 9_ waste residue waste heat utilization mechanism, 91_ cylinder, 92_ material pushing frame, 93_ material controlling plate, 94_ heat conducting block, 10_ vibration mechanism, 101_ vibration motor, 102_ support, 103_ blotter, 11_ moisture filtering frame, 12_ cleaning mechanism, 121_ servo motor, 122_ reciprocating screw rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Example 1

An energy-saving and environment-friendly air preheating device for a coal-fired boiler, as shown in figures 1-5, comprises a bottom plate 1, a preheating pipeline 2, a material blocking block 21, a collecting pipe 5, baffles 6, a flue gas guide plate 7, a gas circulation assembly, a waste residue blocking mechanism 8 and a waste residue waste heat utilization mechanism 9, wherein the top of the bottom plate 1 is connected with the preheating pipeline 2, the preheating pipeline 2 is provided with the gas circulation assembly, the lower part of the left side of the preheating pipeline 2 is rotatably connected with the material blocking block 21, the upper side and the lower side in the preheating pipeline 2 are both connected with the baffles 6, the collecting pipes 5 are uniformly and densely distributed between the two baffles 6 at intervals, the upper part of the collecting pipe 5 passes through the upper baffle 6 and is communicated with the upper part in the preheating pipeline 2, the lower part of the collecting pipe 5 passes through the lower baffle 6 and is communicated with the lower part in the preheating pipeline 2, so that gas below the lower baffle 6 can pass through the collecting pipe 5 and circulate to the upper part of the upper baffle 6, a flue gas guide plate 7 is connected between the upper side and the lower side of the collecting pipes 5 in a sliding manner, damping is arranged between the flue gas guide plate 7 and the collecting pipes 5 to prevent the flue gas guide plate 7 from sliding randomly, the two flue gas guide plates 7 are respectively positioned between the two baffle plates 6, a waste residue blocking mechanism 8 is arranged on the gas flow component, the waste residue blocking mechanism 8 is used for blocking high-temperature waste residues in high-temperature flue gas of the boiler, a waste residue waste heat utilization mechanism 9 is arranged on the waste residue blocking mechanism 8, a gap is arranged between the right side of the upper flue gas guide plate 7 and the preheating pipeline 2, a gap is also arranged between the left side of the lower flue gas guide plate 7 and the preheating pipeline 2, and the gap between the flue gas guide plate 7 and the preheating pipeline 2 and the space inside the preheating pipeline 2 form a flue gas flow channel to prolong the flue gas flow distance and increase the flue gas flow time.

As shown in fig. 1 and 2, the gas circulation assembly includes an air inlet pipe 3, an air outlet pipe 31, a flue gas inlet pipe 4 and a flue gas outlet pipe 41, the lower portion of the right side of the preheating pipe 2 is communicated with the air inlet pipe 3 and the flue gas inlet pipe 4, the flue gas inlet pipe 4 is located above the air inlet pipe 3 and the lower baffle 6, so that flue gas entering from the flue gas inlet pipe 4 can be located between the baffles 6 on both sides, the upper portion of the left side of the preheating pipe 2 is connected with the air outlet pipe 31 and the flue gas outlet pipe 41, and the flue gas outlet pipe 41 is located below the air outlet pipe 31 and the upper baffle 6.

As shown in fig. 3-5, the waste residue blocking mechanism 8 includes a waste residue blocking frame 81, a screen 82, an air inlet pipe 83 and a discharging plate 84, the waste residue blocking frame 81 is communicated between the air inlet pipe 3 and the flue gas inlet pipe 4, the screen 82 is connected to the upper portion of the left side in the waste residue blocking frame 81, the air inlet pipe 83 is communicated to the upper portion of the right side of the waste residue blocking frame 81, the screen 82 is located between the air inlet pipe 83 and the flue gas inlet pipe 4 to enter the flue gas through the air inlet pipe 83, the waste residue in the flue gas is filtered by the screen 82, and the discharging plate 84 is slidably connected to the bottom of the waste residue blocking frame 81 for blocking the waste residue and discharging the waste residue.

As shown in fig. 3 to 5, the waste residue waste heat utilization mechanism 9 includes an air cylinder 91, a pushing frame 92, a material control plate 93 and a heat conduction block 94, the air cylinder 91 is installed on the top of the waste residue blocking frame 81, an expansion rod of the air cylinder 91 is in sliding fit with the waste residue blocking frame 81, the pushing frame 92 is connected to the expansion rod of the air cylinder 91, the pushing frame 92 is in contact with the screen 82 so that the pushing frame 92 can move to scrape off waste residues attached to the screen 82, the lower portion of the pushing frame 92 is arranged in an inclined manner so that waste materials can fall down from the inclined position of the pushing frame 92 when the pushing frame 92 moves down, the material control plate 93 is connected to the waste residue blocking frame 81, the material control plate 93 is also arranged in an inclined manner so that waste residues falling on the material control plate 93 are discharged to the lower portion of the pushing frame 92, and the lower portion of the air inlet duct 3 is connected to the heat conduction block 94.

When the air of the coal-fired boiler needs to be preheated, the device can be used, when the device is used, the air is added into the preheating pipeline 2 through the air inlet pipeline 3, the air in the preheating pipeline 2 is circulated to the upper part in the preheating pipeline 2 through the baffle 6 and the collecting pipe 5, the flue gas after the combustion of the boiler can be connected with the air inlet pipeline 83 before, the flue gas enters the preheating pipeline 2 through the screen 82 and the flue gas inlet pipeline 4, the waste residue in the flue gas can be blocked by the screen 82, the flue gas entering the preheating pipeline 2 can heat the air in the collecting pipe 5 due to the heat of the flue gas, thereby achieving the effect of recycling the flue gas of the coal-fired boiler, and the waste residue on the screen 82 also carries the heat, can control cylinder 91 drive and push away material frame 92 and remove repeatedly, so that push away the waste residue that material frame 92 on with screen cloth 82 and push away and fall, the waste residue that falls to air admission pipeline 3 department and stripper 84 top, thereby utilize the heat of waste residue to preheat the air that air admission pipeline 3 located, the waste residue that is located stripper 84 top can be conducted the heat to air admission pipeline 3 department more effectively through heat conduction piece 94, so, just use this preheating device, and when using, can come into use with the heat in the waste residue, further improvement thermal utilization ratio, when the waste residue blocks the waste residue heat consumption in the framework 81 and finishes, can pull open stripper 84 and discharge the waste residue.

Example 2

On the basis of embodiment 1, as shown in fig. 1, 7 and 8, the slag-stopping device further comprises a vibration mechanism 10, wherein the vibration mechanism 10 comprises a vibration motor 101, a bracket 102 and a buffer pad 103, the vibration motor 101 is installed on the rear side of the slag-stopping frame 81 and is used for vibrating the slag-stopping frame 81 to assist the discharge of the slag on the screen 82, the two brackets 102 are installed on the right side of the top of the bottom plate 1, the buffer pad 103 is connected to the top of the bracket 102, and the buffer pad 103 is in contact with the slag-stopping frame 81.

After long-term use, some waste residues may be attached to the screen 82, the waste residues are difficult to be scraped by the material pushing frame 92, and at the moment, the vibration motor 101 can be started to drive the waste residue blocking frame body 81 to vibrate, so that the screen 82 is driven to vibrate, the waste residues on the screen 82 are shaken off, and thus the waste residues on the screen 82 can be shaken off.

As shown in fig. 2 and 6, the preheating pipeline further comprises a moisture filtering frame 11, the moisture filtering frame 11 is mounted at the lower part in the preheating pipeline 2, and the moisture filtering frame 11 is mounted on the preheating pipeline 2 by means of bolts, so that the moisture filtering frame 11 can be detached.

When air circulates in the preheating pipeline 2, moisture in the air can be filtered through the moisture filtering frame 11, so that the effect of filtering the moisture in the air is achieved.

As shown in fig. 2, the flue gas preheating device further comprises a cleaning mechanism 12, the cleaning mechanism 12 comprises a servo motor 121 and a reciprocating screw rod 122, the servo motor 121 is installed at the top of the preheating pipeline 2, a reciprocating screw rod 122 is connected to an output shaft of the servo motor 121, the reciprocating screw rod 122 is combined by two reciprocating screw rods 122 and distributed vertically, the reciprocating screw rod 122 is located in the preheating pipeline 2, the upper reciprocating screw rod 122 is in threaded connection with the upper flue gas guide plate 7, and the lower reciprocating screw rod 122 is in threaded connection with the lower flue gas guide plate 7, so that the two flue gas guide plates 7 are driven to move through the rotation of the reciprocating screw rod 122.

After preheating pipeline 2 uses for a long time, need clean its inside pressure manifold 5, can start servo motor 121 drive reciprocal lead screw 122 rotation this moment to drive flue gas guide plate 7 and reciprocate, add clean liquid through flue gas discharge pipe 41 simultaneously, clean collecting manifold 5, after the cleanness finishes, can open striker block 21, will preheat the clean liquid discharge in the pipeline 2.

The technical principles of the embodiments of the present invention have been described above with reference to specific embodiments. The description is only intended to explain the principles of embodiments of the invention and should not be taken in any way as limiting the scope of the embodiments of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the present invention.

Claims

1. The utility model provides an energy-concerving and environment-protective air preheating equipment for coal fired boiler, is including bottom plate (1), preheating pipe (2), keeps off material piece (21) and gas circulation subassembly, and bottom plate (1) top is connected with preheating pipe (2), is equipped with the gas circulation subassembly on preheating pipe (2), and preheating pipe (2) left side lower part rotary type is connected with and keeps off material piece (21), its characterized in that: still including pressure manifold (5), baffle (6), flue gas guide plate (7), waste residue blocking mechanism (8) and waste residue waste heat utilization mechanism (9), preheat the interior upper and lower both sides of pipeline (2) and all be connected with baffle (6), evenly spaced intensive distribution has pressure manifold (5) between two baffles (6), pressure manifold (5) upper portion is passed top baffle (6) and is communicated with each other with preheating pipeline (2) interior upper portion, pressure manifold (5) lower part is passed below baffle (6) and is communicated with each other with preheating pipeline (2) interior lower part, so that the gas of downside baffle (6) below can circulate to upside baffle (6) top through pressure manifold (5), all slidingly be connected with flue gas guide plate (7) between the upper and lower both sides of many pressure manifold (5), damping has between flue gas guide plate (7) and pressure manifold (5), two flue gas guide plate (7) are located between two baffles (6) respectively, be equipped with waste residue blocking mechanism (8) on the gas circulation subassembly, waste residue blocking mechanism (8) is arranged in blockking the high temperature flue gas of boiler, be equipped with waste residue utilization mechanism (9) on waste residue blocking mechanism (8).

2. An energy-saving and environment-friendly air preheating apparatus for a coal-fired boiler according to claim 1, characterized in that: the gas circulation assembly comprises an air inlet pipeline (3), an air outlet pipeline (31), a flue gas inlet pipeline (4) and a flue gas outlet pipeline (41), the lower part of one side of a preheating pipeline (2) is communicated with the air inlet pipeline (3) and the flue gas inlet pipeline (4), the flue gas inlet pipeline (4) is positioned above the air inlet pipeline (3) and a lower baffle (6), so that flue gas entering from the flue gas inlet pipeline (4) can be positioned between two side baffles (6), the upper part of the other side of the preheating pipeline (2) is connected with the air outlet pipeline (31) and the flue gas outlet pipeline (41), and the flue gas outlet pipeline (41) is positioned below the air outlet pipeline (31) and the upper baffle (6).

3. An energy-saving and environment-friendly air preheating device for a coal-fired boiler according to claim 1, characterized in that: a gap is formed between one side of the upper flue gas guide plate (7) and the preheating pipeline (2), a gap is also formed between the other side of the lower flue gas guide plate (7) and the preheating pipeline (2), and a flue gas circulation channel is formed by a gap between the flue gas guide plate (7) and the preheating pipeline (2) and the space inside the preheating pipeline (2) so as to prolong the flue gas circulation distance and prolong the flue gas circulation time.

4. An energy-saving and environment-friendly air preheating apparatus for a coal-fired boiler according to claim 2, characterized in that: waste residue blocks mechanism (8) and blocks framework (81) including the waste residue, screen cloth (82), admission line (83) and stripper (84), the intercommunication has the waste residue to block framework (81) between air admission pipeline (3) and the flue gas admission line (4), the waste residue blocks one side that is close to flue gas admission line (4) in framework (81) and is connected with screen cloth (82), the waste residue blocks one side intercommunication that framework (81) are close to screen cloth (82) and has admission line (83), screen cloth (82) are located between admission line (83) and flue gas admission line (4), in order to get into the flue gas through admission line (83), high temperature waste residue in the flue gas is filtered by screen cloth (82) again, the waste residue blocks framework (81) bottom slidingtype and is connected with stripper (84), be used for blocking the waste residue and discharge the waste residue.

5. An energy-saving and environment-friendly air preheating device for a coal-fired boiler according to claim 4, characterized in that: the waste residue waste heat utilization mechanism (9) comprises an air cylinder (91), a material pushing frame (92), a material control plate (93) and a heat conduction block (94), the air cylinder (91) is installed at the top of the waste residue blocking frame body (81), an expansion link of the air cylinder (91) is in sliding fit with the waste residue blocking frame body (81), the expansion link of the air cylinder (91) is connected with the material pushing frame (92), the material pushing frame (92) is in contact with a screen (82) so that the material pushing frame (92) can move to scrape off waste residues attached to the screen (82), the lower portion of the material pushing frame (92) is obliquely arranged so that the oblique position of the material pushing frame (92) can allow waste materials to fall down when the material pushing frame (92) moves down, the material control plate (93) is connected in the waste residue blocking frame body (81), the material control plate (93) is also obliquely arranged so that the waste residues falling on the material control plate (93) can be discharged to the lower portion of the material pushing frame (92), and the lower portion of the air inlet pipeline (3) is connected with the heat conduction block (94).

6. An energy-saving and environment-friendly air preheating device for a coal-fired boiler according to claim 4, characterized in that: still including vibration mechanism (10), vibration mechanism (10) are including shock dynamo (101), support (102) and blotter (103), the waste residue blocks and installs shock dynamo (101) on framework (81), be used for making the waste residue block framework (81) vibrations, discharge with the waste residue on the auxiliary screen cloth (82), bottom plate (1) top is close to the waste residue and blocks the position of framework (81) and install support (102), support (102) top is connected with blotter (103), blotter (103) block framework (81) contact with the waste residue.

7. An energy-saving and environment-friendly air preheating apparatus for a coal-fired boiler according to claim 1, characterized in that: the preheating pipeline is characterized by further comprising a moisture filtering frame (11), wherein the moisture filtering frame (11) is installed at the lower portion in the preheating pipeline (2), and the moisture filtering frame (11) is detachably arranged.

8. An energy-saving and environment-friendly air preheating apparatus for a coal-fired boiler according to claim 1, characterized in that: still including clearance mechanism (12), clearance mechanism (12) are including servo motor (121) and reciprocal lead screw (122), servo motor (121) are installed at preheating pipe (2) top, be connected with reciprocal lead screw (122) on the output shaft of servo motor (121), this reciprocal lead screw (122) comprises two reciprocal lead screw (122), reciprocal lead screw (122) is located preheating pipe (2), two reciprocal lead screw (122) respectively with two upper and lower flue gas guide plate (7) threaded connection, in order to remove through two flue gas guide plate (7) of reciprocal lead screw (122) rotatory drive.