CN216868471U

CN216868471U - Boiler combustion system with material returning function

Info

Publication number: CN216868471U
Application number: CN202123237423.XU
Authority: CN
Inventors: 欧斌
Original assignee: Huzhou South Taihu Electric Power Technology Co ltd
Current assignee: Huzhou South Taihu Electric Power Technology Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-07-01
Anticipated expiration: 2031-12-21

Abstract

The utility model discloses a boiler combustion system with a material returning function, which comprises a furnace body, wherein two sides of the top of the furnace body are provided with exhaust ports, one end of each exhaust port is connected with a high-temperature separator, the top of the high-temperature separator is connected with a smoke outlet pipe, the lower end of the high-temperature separator extends to one side of the bottom of the furnace body and is provided with a material returning device, the bottom of the material returning device is provided with an ash discharge pipe, one side of the material returning device is connected with the furnace body through a material returning pipe, the other side of the material returning device is provided with a material returning fan, the smoke outlet pipe comprises a blocking part, an air guiding part and a discharging part which are sequentially connected from bottom to top, the blocking part is provided with a blocking section on one side far away from the exhaust ports, the bottom of the blocking section is lower than the bottom surfaces of the exhaust ports, an arc-shaped opening is arranged on one side close to the exhaust ports, the upper end of the arc-shaped opening extends to the top surfaces of the exhaust ports, and the inner walls of the smoke outlet pipes are provided with annular heat insulation layers. The utility model can effectively prolong the service life of the smoke outlet pipe and improve the material returning effect of the boiler.

Description

Boiler combustion system with material returning function

Technical Field

The utility model relates to a coal-fired boiler, in particular to a boiler combustion system with a material returning function.

Background

Because a large amount of completely unburned particulate matters are discharged along with the flue gas in the use process of the coal-fired boiler for the fluidized bed, the particulate matters not only increase the treatment burden and the treatment cost of the flue gas, but also cause the waste of resources; make present producer generally through install the returning charge device additional in coal fired boiler's outside, utilize the returning charge device to intercept this part particulate matter and send into the boiler again and then the postcombustion to the realization is to the impurity content in the complete utilization and the reduction flue gas of dyestuff.

The existing material returning method for a coal-fired boiler is as described in patent 202023121873.8, a material returning coal-fired boiler, wherein a smoke outlet pipe is arranged outside a smoke outlet of the coal-fired boiler, the smoke outlet pipe and the smoke outlet are separated from each other and vertically arranged, so that smoke discharged from the smoke outlet is blocked by the side wall of the smoke outlet pipe, flows along the U-shaped gas flowing direction, enters the smoke outlet pipe from the bottom surface and is discharged. Should walk under the gas state, the heavier particulate matter of quality can drop to the returning charge ware of below in the downward flow in-process is automatic to be sent into the boiler again and carry out the postcombustion, thereby realize the returning charge effect. However, the material returning mechanism has the following defects in practical use:

one is because the temperature of flue gas when discharging is higher, and the lateral wall of outlet direction perpendicular play tobacco pipe for it can receive the high temperature flue gas and come from positive continuous impact to cause out tobacco pipe surface metal's hole and damage to go out the tobacco pipe when intercepting the flue gas. In order to solve the problem, although manufacturers can wrap the outer wall of the smoke outlet pipe by using materials such as heat insulation cotton, heat insulation coatings and the like, the mode can only play a limited protection effect, and the surface protection layer can still be damaged after long-term use. The smoke outlet pipe is required to be fixed on the inner side of the boiler, so that the smoke outlet pipe cannot be taken out and replaced after the boiler is put into use, and cannot be stably protected for a long time, and the stability of the smoke outlet pipe has defects.

Secondly, in the process that the flue gas discharged by the boiler flows towards the smoke outlet pipe, the particles with heavier mass can be separated from the air flow and fall down naturally, but a part of the particles with lighter mass and smaller volume still flow into the smoke outlet pipe along with the flue gas, and the existing material returning device cannot separate the particles, so that the material returning effect is not ideal.

Therefore, the existing coal-fired boiler has the problems that the smoke outlet pipe is easy to damage and the material returning effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a boiler combustion system with a material returning function. The boiler can effectively prolong the service life of the smoke outlet pipe and improve the material returning effect of the boiler.

The technical scheme of the utility model is as follows: boiler combustion system of material function is returned in area, including the furnace body, the below of furnace body is equipped with the ash hole, and the top both sides of furnace body are equipped with the exhaust port, and the one end of exhaust port is connected with high temperature separator, and high temperature separator's top is connected with out the tobacco pipe, and high temperature separator's lower extreme extends to bottom one side of furnace body and is equipped with the returning charge ware, and the bottom of returning charge ware is equipped with puts the ash pipe, and the furnace body is connected through the returning charge pipe to one side of returning charge ware, and the opposite side of returning charge ware is equipped with the returning charge fan, it is equipped with the material fan to go out the tobacco pipe from bottom to top including the barricade portion, the induced air portion and the discharge portion that connect gradually, barricade portion is equipped with the block cross-section keeping away from exhaust port one side, and the bottom that blocks the cross-section is less than the bottom surface of exhaust port, and the barricade portion is equipped with the arc opening near exhaust port one side, and the upper end of arc opening extends to the top surface top of exhaust port, the inner wall of going out the tobacco pipe is equipped with annular insulating layer.

In the boiler combustion system with the material returning function, the heat insulation layer comprises first reinforcing nails distributed on the inner wall of the smoke outlet pipe, the inner ends of the first reinforcing nails are connected with each other through a steel wire mesh, a heat insulation material layer is filled between the steel wire mesh and the smoke outlet pipe, and the steel wire mesh is completely wrapped outside the heat insulation material layer.

In the boiler combustion system of aforesaid area feed back function, still including being located the second on arresting part and induced air portion inner wall and consolidating the nail, the second consolidates and strengthens the mutual dislocation set between nail and the first nail, and the one end that the second was consolidated the nail extends to the wire net outside and is connected with the bellying, and the bellying on each second was consolidated the mutual dislocation set of nail and is followed the complete cover of horizontal direction with the insulating layer.

In the boiler combustion system with the material returning function, the air inducing portion is obliquely arranged from bottom to top towards the furnace body, the protruding portion is located on one side, away from the furnace body, of the blocking portion and the air inducing portion, the other side of the air inducing portion forms a falling surface, and the lower end of the falling surface is connected with the arc-shaped opening.

In the boiler combustion system with the material returning function, the inner wall of the blocking part at one side of the arc-shaped opening is provided with the guide plate connected with the smoke outlet pipe, and the lower end of the guide plate extends downwards to the bottom of the blocking section along the edge of the blocking part.

In the boiler combustion system with the material returning function, the upper end of the guide plate is positioned in the heat insulation layer above the arc-shaped opening, the lower end of the guide plate extends downwards along the heat insulation layer, the outer end face of the guide plate does not exceed the inner wall face of the heat insulation layer, and the heat insulation layer is provided with the material returning groove positioned on one side of the guide plate.

In the boiler combustion system with the material returning function, the material returning grooves at the outlet height of the smoke outlet are positioned at the left side and the right side of the blocking part, and the material returning grooves and the smoke outlet are separated from each other through the heat insulation layer.

In the boiler combustion system with the material returning function, the lower falling surface is provided with the purging opening, and the outer side of the purging opening is provided with the air nozzle.

Compared with the prior art, the utility model has the following characteristics:

(1) according to the utility model, the arc-shaped opening is arranged on the smoke outlet pipe, so that smoke discharged from the smoke outlet can directly enter the smoke outlet pipe along the arc-shaped opening, the direct impact on the interception surface is reduced, and the damage degree of the interception surface is reduced; through the structural limitation of the heat insulation layer on the inner wall of the smoke outlet pipe, the pouring strength of the heat insulation material layer can be improved by utilizing the matching of the first reinforcing nails and the steel wire meshes, so that the possibility that large blocks of the heat insulation material layer fall off after being locally damaged is reduced, the working stability of the smoke outlet pipe is improved, and the service life of the smoke outlet pipe is prolonged;

(2) through the structural matching of the second reinforcing nails and the convex parts in the heat insulation layer, the smoke discharged outwards along the smoke outlet pipe can be intercepted in multiple ways, so that particles in the smoke can be intercepted at the convex parts, and the rest smoke can pass through the convex parts and be discharged outwards; after the particles are intercepted, one part of the particles directly fall to a falling surface after being accumulated to a certain weight, and then the particles slide downwards to a material returning device along the falling surface and a guide plate, so that the material returning effect is realized; the other part of the smoke outlet pipe is directly adhered to the bulge part, and the smoke outlet pipe is swept by the air nozzle after the combustion of the boiler is finished, so that the particles fall into the material returning device along with the sweeping and are combusted together in the subsequent use, thereby realizing the material returning effect and reducing the adhesion of the particles on the inner wall of the smoke outlet pipe;

(3) by limiting the structure of the guide plate, on one hand, the heat insulation layer can be used for shielding the guide plate, so that particles cannot be blown into the smoke outlet pipe again under the influence of airflow when falling, on the other hand, because the heat insulation layer outside the smoke outlet is arranged in parallel with the air outlet direction, the contact area between the heat insulation layer and the airflow can be reduced, the damage of the heat insulation layer outside the guide plate is reduced, the thickness of the heat insulation layer at the position can exceed the thickness of the heat insulation layer, the normal work of the guide plate cannot be influenced after the heat insulation layer is partially damaged, and the material returning effect of the smoke outlet device is further improved;

therefore, the utility model can effectively prolong the service life of the smoke outlet pipe and improve the material returning effect of the boiler.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the line A of FIG. 1;

FIG. 3 is an enlarged view of FIG. 1 taken along line B;

FIG. 4 is a cross-sectional view of an insulation layer;

fig. 5 is an expanded view of the smoke outlet pipe.

The labels in the figures are: 1-furnace body, 2-smoke outlet, 3-high temperature separator, 4-smoke outlet pipe, 5-return feeder, 6-ash discharge pipe, 7-return pipe, 8-return fan, 9-first reinforcing nail, 10-steel wire mesh, 11-heat insulation material layer, 12-second reinforcing nail, 13-bulge, 14-falling surface, 15-guide plate, 16-return groove, 401-blocking part, 402-wind guiding part, 403-discharge part, 404-blocking section, 405-arc opening and 141-purging port.

Detailed Description

The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.

Examples are given. The boiler combustion system with the material returning function comprises a furnace body 1, an ash outlet is arranged below the furnace body 1, two sides of the top of the furnace body 1 are provided with smoke outlets 2, one end of each smoke outlet 2 is connected with a high-temperature separator 3, the top of each high-temperature separator 3 is connected with a smoke outlet pipe 4, the lower end of each high-temperature separator 3 extends to one side of the bottom of the furnace body 1 and is provided with a material returning device 5, the bottom of each material returning device 5 is provided with an ash discharge pipe 6, one side of each material returning device 5 is connected with the furnace body 1 through a material returning pipe 7, the other side of each material returning device 5 is provided with a material returning fan 8, each smoke outlet pipe 4 comprises a blocking part 401, an air introducing part 402 and a discharging part 403 which are sequentially connected from bottom to top, the blocking part 401 is provided with a blocking section 404 on one side far away from the smoke outlets 2, the bottom of the blocking section 404 is lower than the bottom of the smoke outlets 2, an arc-shaped opening 405 is arranged on one side close to the smoke outlets 2, and the upper end of the arc-shaped opening 405 extends to the top of the smoke outlets 2, the inner wall of the smoke outlet pipe 4 is provided with an annular heat insulation layer.

The insulating layer is including distributing first reinforcement nail 9 on going out the tobacco pipe 4 inner wall, and the inner of first reinforcement nail 9 is through wire net 10 interconnect, and it has thermal-insulated bed of material 11 to fill between wire net 10 and the tobacco pipe 4, and thermal-insulated bed of material 11's outside wraps up wire net 10 completely.

Still including being located the second reinforcing nail 12 on arresting part 401 and induced draft part 402 inner wall, the mutual dislocation set between second reinforcing nail 12 and the first reinforcing nail 9, the one end of second reinforcing nail 12 extends to the wire net 10 outside and is connected with bellying 13, bellying 13 and thermal-insulated bed of material 11 are by thermal-insulated material casting shaping, and the bellying 13 mutual dislocation set on each second reinforcing nail 12 just covers the complete of insulating layer along the horizontal direction.

The air inducing portion 402 is obliquely arranged from bottom to top towards the furnace body 1, the protruding portion 13 is located on one side, away from the furnace body 1, of the blocking portion 401 and the air inducing portion 402, the other side of the air inducing portion 402 forms a falling surface 14, and the lower end of the falling surface 14 is connected with the arc-shaped opening 405.

The inner wall of the blocking part 401 at one side of the arc-shaped opening 405 is provided with a guide plate 15 connected with the smoke outlet pipe 4, the section of the guide plate 15 is L-shaped, and the lower end of the guide plate 15 extends downwards to the bottom of the blocking section 404 along the edge of the blocking part 401.

The upper end of deflector 15 is located the insulating layer to arc opening 405 top in, the lower extreme of deflector 15 extends along the insulating layer downwardly, the outer terminal surface of deflector 15 does not exceed the internal wall face of insulating layer, is equipped with the returning charge chute 16 that is located 15 one side of deflector on the insulating layer, the insulating layer of returning charge chute 16 top forms and returns the inclined plane of 16 complex in the charge chute.

The material returning grooves 16 at the outlet height of the smoke outlet 2 are positioned at the left side and the right side of the blocking part 401, and the material returning grooves 16 and the smoke outlet 2 are separated from each other through a heat insulation layer.

The falling surface 14 is provided with a purging opening 141, a door body is arranged at the purging opening 141, and an air nozzle is arranged outside the purging opening 141 and opened by an operator and purged inwards when in use.

The working principle of the utility model is as follows: when the utility model is used, high-temperature flue gas generated by combustion of the furnace body 1 flows upwards and is horizontally discharged from the smoke outlets 2 at two sides. The smoke is discharged from the smoke outlet 2 and then directly flows into the smoke outlet pipe 4 through the arc-shaped opening 405; the flue gas can be guided through the blocking section 404, and the stable flow of the flue gas is ensured. The smoke flows outwards along with the smoke outlet pipe 4 after entering, and sequentially passes through the convex parts 13 in the flowing process, the effect of blocking particulate matters in the smoke can be achieved through the convex parts 13, the particulate matters are blocked at the convex parts 13, the smoke can pass through the convex parts 13 and is directly discharged from the discharge part 403, and the smoke discharging effect is achieved. As the particulate matter at the raised portion 13 gradually accumulates, it passes through the flue gas and falls to the falling surface 14 and then rolls down the falling surface 14 and into the return chute 16. The particulate matter drops to both sides along deflector 15 after getting into return trough 16, and the in-process that drops can carry out outside flue gas to it through insulating layer and the cooperation of deflector 15 and block, avoids the particulate matter to receive the flue gas influence to flow upwards once more. When the particulate matter falls out from the bottom of returning charge chute 16, the particulate matter has been located the below of exhaust port 2 this moment, and then avoids the particulate matter to be blown away by the flue gas when dropping, and then improves the collection stability to the particulate matter. After the particles enter the material returning device 5, the particles are blown by the material returning fan 8 to enter the furnace body 1 again for secondary combustion, so that the material returning effect is achieved, and the utilization rate of waste materials is improved.

Under the cooperation, the device can realize the collection and the material return of partial small-mass particles in the smoke; and the residual particles and fly ash which can not be intercepted due to too small volume or mass are discharged along with the flue gas and then are treated by the corresponding treatment device. After the furnace body 1 finishes burning, an operator can periodically operate the air nozzle to blow the inner wall of the smoke outlet pipe 4 from the blowing port 141, so that particles which are attached to the surface of the heat insulation layer and the protruding part 13 and cannot naturally fall are blown into the material returning pipe 7, the waste materials are utilized, and the particles are prevented from being attached to the inner wall of the smoke outlet pipe 4.

Claims

1. Boiler combustion system of material function is returned in area, including furnace body (1), the top both sides of furnace body (1) are equipped with exhaust port (2), the one end of exhaust port (2) is connected with high temperature separator (3), the top of high temperature separator (3) is connected with out tobacco pipe (4), the lower extreme of high temperature separator (3) extends to bottom one side of furnace body (1) and is equipped with returning charge ware (5), the bottom of returning charge ware (5) is equipped with puts ash pipe (6), furnace body (1) is connected through returning charge pipe (7) to one side of returning charge ware (5), the opposite side of returning charge ware (5) is equipped with returning charge fan (8), its characterized in that: go out tobacco pipe (4) from bottom to top including the arresting part (401), induced air portion (402) and the discharge portion (403) that connect gradually, arresting part (401) is being equipped with and is blocking cross-section (404) keeping away from exhaust port (2) one side, and the bottom of interception face (404) is less than the bottom surface of exhaust port (2), and arresting part (401) are being equipped with arc opening (405) being close to exhaust port (2) one side, and the upper end of arc opening (405) extends to the top surface top of exhaust port (2), the inner wall of going out tobacco pipe (4) is equipped with annular insulating layer.

2. The boiler combustion system with feedback function of claim 1, characterized in that: the insulating layer is including distributing first reinforcement nail (9) on play tobacco pipe (4) inner wall, and the inner of first reinforcement nail (9) is through wire net (10) interconnect, and it has thermal-insulated bed of material (11) to fill between wire net (10) and the play tobacco pipe (4), and wire net (10) are wrapped up completely to the outside of thermal-insulated bed of material (11).

3. The boiler combustion system with feedback function of claim 2, characterized in that: still including being located second reinforcement nail (12) on arresting part (401) and induced draft portion (402) inner wall, second reinforcement nail (12) and first reinforcement nail (9) between dislocation set each other, the one end of second reinforcement nail (12) extends to wire net (10) outside and is connected with bellying (13), and bellying (13) on each second reinforcement nail (12) dislocation set each other just covers the insulating layer completely along the horizontal direction.

4. The boiler combustion system with feedback function of claim 3, characterized in that: the air inducing portion (402) is obliquely arranged from bottom to top towards the furnace body (1), the protruding portion (13) is located on one side, away from the furnace body (1), of the blocking portion (401) and the air inducing portion (402), a falling surface (14) is formed on the other side of the air inducing portion (402), and the lower end of the falling surface (14) is connected with the arc-shaped opening (405).

5. The boiler combustion system with feedback function of claim 4, characterized in that: the inner wall of the blocking part (401) on one side of the arc-shaped opening (405) is provided with a guide plate (15) connected with the smoke outlet pipe (4), and the lower end of the guide plate (15) extends downwards to the bottom of the blocking section (404) along the edge of the blocking part (401).

6. The boiler combustion system with feedback function of claim 5, characterized in that: the upper end of deflector (15) is located the insulating layer of arc opening (405) top, and the lower extreme of deflector (15) extends along the insulating layer downwardly, and the outer terminal surface of deflector (15) is no longer than the internal face of insulating layer, is equipped with on the insulating layer to be located deflector (15) one side return silo (16).

7. The boiler combustion system with feedback function of claim 6, characterized in that: the material returning grooves (16) positioned at the outlet height of the smoke outlet (2) are positioned at the left side and the right side of the blocking part (401), and the material returning grooves (16) and the smoke outlet (2) are separated from each other through a heat insulation layer.

8. The boiler combustion system with feedback function of claim 4, characterized in that: the falling surface (14) is provided with a purging opening (141), and the outer side of the purging opening (141) is provided with an air nozzle.