CN212252583U

CN212252583U - Straw bundle burning boiler

Info

Publication number: CN212252583U
Application number: CN202021863711.9U
Authority: CN
Inventors: 罗孝标; 李永久; 石延超; 杨德利; 卢风雷; 刘思远; 曹斌; 潘尚磊
Original assignee: Chengde Bente Ecological Energy Source Technology Co ltd
Current assignee: Chengde Bente Ecological Energy Source Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-12-29
Anticipated expiration: 2030-08-31

Abstract

The utility model provides a straw bundle burning boiler, belonging to the field of biomass boilers, comprising a boiler body and a material pushing mechanism; the hearth of the furnace body is sequentially divided into a preheating zone, a combustion zone and a burnout zone from front to back, a feed inlet is formed in the front side of the preheating zone, a slag outlet is formed in the burnout zone, and a first air nozzle is arranged on the side wall of the bottom of the combustion zone; the pushing mechanism is used for pushing the straws into the feeding hole in a trapping manner and enabling the straw bundles pushed into the feeding hole to gradually move backwards under the pushing action of the subsequent straw bundles. The utility model provides a straw bundle burns boiler has cancelled the grate that sets up in furnace, and pushing equipment does not receive the influence of the interior high temperature of stove, avoids causing the problem that boiler maintenance cost is high because of the grate damages, has prolonged the life of boiler, and in addition, the cost that sets up pushing equipment outside the furnace body will be far less than the cost that sets up the grate, the manufacturing cost of also greatly reduced's boiler.

Description

Straw bundle burning boiler

Technical Field

The utility model belongs to the technical field of biomass boiler, more specifically say, relate to a straw bundle burns boiler.

Background

The biomass boiler is a boiler using biomass energy as fuel, is effective in recycling of agricultural and forestry residual crops, has positive significance in saving conventional energy, optimizing energy structure in China and reducing environmental pollution, and the straw is an important member in the biomass energy.

The existing boiler is generally a boiler with a grate, the main function of the grate is to enable dye to gradually move to a burnout area, and an air nozzle of the boiler is generally arranged at the bottom end of a hearth and sends air upwards, and the air nozzle plays a role in supporting combustion after air distribution of the grate. However, the fire grate has special limitation on dyes, the fire grate needs to be protected from heat insulation by ash slag generated after fuel combustion, if straws are directly combusted, the ash content of the straws is low, the ash melting point is also low, the fire grate cannot be effectively protected from heat insulation, the molten ash slag easily blocks a ventilation and cooling air gap of the fire grate, and meanwhile, the heat value of the unit volume of the straws is low, so that the area of the fire grate of the boiler is large, the manufacturing cost of the boiler is increased, the service life is short, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a straw bundle burns boiler aims at solving the boiler use cost who uses the straw as fuel that exists among the prior art higher, and the shorter technical problem of life.

In order to achieve the above object, the utility model adopts the following technical scheme: there is provided a straw-baling boiler, comprising:

the furnace body is characterized in that a hearth of the furnace body is sequentially divided into a preheating zone, a combustion zone and a burnout zone from front to back, a feed inlet is formed in the front side of the preheating zone, a slag outlet is formed in the burnout zone, and a first air nozzle is arranged on the side wall of the bottom of the combustion zone; and

and the pushing mechanism is used for pushing the straws into the feeding hole in a trapping manner and enabling the straw bundles pushed into the feeding hole to gradually move backwards under the pushing action of subsequent straw bundles.

As another embodiment of the application, the bottom side wall of the burnout zone is provided with a second air nozzle.

As another embodiment of the present application, the number of the first nozzles is greater than the number of the second nozzles.

As another embodiment of the present application, the second tuyere is disposed at a rear sidewall of the burnout zone.

As another embodiment of the present application, a third tuyere is provided at the top of the combustion zone.

As another embodiment of the present application, a fourth tuyere is arranged in the middle of the burnout zone.

As another embodiment of the present application, the fourth tuyere is disposed at a rear sidewall of the burnout zone.

As another embodiment of the present application, the material pushing mechanism includes:

the receiving tank body is arranged on the front side of the furnace body, an outlet at the end part of the receiving tank body is communicated with the feeding hole, and an opening at the top of the receiving tank body is used for receiving straw bundles; and

and the pushing unit is used for pushing the straw bundles falling into the receiving groove body into the feeding hole.

As another embodiment of the application, the pushing end of the pushing unit is provided with a pushing plate, and the pushing plate is used for being in contact with the straw bundle and sealing the feeding hole.

As another embodiment of the present application, the furnace is a circular tunnel furnace.

The utility model provides a straw bundle burns boiler's beneficial effect lies in: compared with the prior art, the utility model discloses straw bundle burns boiler has cancelled the grate that sets up in furnace, set up pushing equipment outside the furnace body, the quantity of bundling through the gradual increase straw plays the effect that makes furnace straw bundle backward movement gradually in playing, carry out direct air distribution through setting up first tuyere at combustion area bottom lateral wall, the effect of carrying out air distribution through the grate has been replaced, and then can make straw bundle fully burn, pushing equipment does not receive the influence of stove high temperature, avoid causing the problem that boiler maintenance cost is high because of the grate damage, the life of boiler has been prolonged, and, the cost that sets up pushing equipment outside the furnace body will be far less than the cost that sets up the grate, the manufacturing cost of the boiler of also greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a straw burning boiler according to an embodiment of the present invention;

fig. 2 is a schematic view showing a first usage state of the pushing mechanism according to the first embodiment of the present invention;

fig. 3 is a schematic view illustrating a second usage state of the pushing mechanism according to the first embodiment of the present invention;

fig. 4 is a schematic view showing a third usage state of the pushing mechanism according to the first embodiment of the present invention;

fig. 5 is a schematic view illustrating a fourth usage state of the pushing mechanism according to the first embodiment of the present invention;

fig. 6 is a schematic structural view of a pushing mechanism adopted in the second embodiment of the present invention;

fig. 7 is a schematic side view of a pushing mechanism according to the second embodiment of the present invention.

In the figure: 1. a furnace body; 101. a preheating zone; 102. a combustion zone; 103. a burnout zone; 104. a feed inlet; 105. a first tuyere; 106. a convective heat exchange tube bundle; 107. a smoke outlet; 108. a slag remover; 109. a second tuyere; 110. a third tuyere; 111. a fourth tuyere; 112. a first air distribution pipe; 113. a second air distribution pipe; 2. a material pushing mechanism; 201. a receiving tank body; 202. a pushing unit; 203. a material pushing plate; 204. a protective baffle; 3. bundling straws; 4. a guide baffle plate; 5. and (5) conveying the belt.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model discloses the people discovers, and the straw still keeps certain straw fiber framework after volatile analysis goes out the burning, and the straw lime-ash is lighter a lot than the coal ash-ash, and the straw bundle of this application burns the boiler and mainly designs based on above-mentioned two characteristics.

Referring to fig. 1, the straw burning boiler of the present invention will now be described. The straw bundling boiler comprises a boiler body 1 and a material pushing mechanism 2; the hearth of the furnace body 1 is sequentially divided into a preheating zone 101, a combustion zone 102 and an burnout zone 103 from front to back, a feed inlet 104 is arranged on the front side of the preheating zone 101, a slag outlet is arranged at the position of the burnout zone 103, and a first air nozzle 105 is arranged on the side wall of the bottom of the combustion zone 102; the pushing mechanism 2 is used for pushing the straw bundle 3 into the feeding hole 104, and is used for enabling the straw bundle 3 which is pushed into the feeding hole 104 to gradually move backwards under the pushing action of the subsequent straw bundle 3.

It should be noted that the dotted line in fig. 1 is used to simply divide the preheating zone 101, the combustion zone 102, and the burnout zone 103, and does not represent the specific form of the preheating zone 101, the combustion zone 102, and the burnout zone 103, nor the physical structure in the furnace.

The pushing mechanism 2 is arranged outside the furnace body 1, the straw bundles 3 are directly pushed into the preheating zone 101 of the hearth from the feeding hole 104, and the straw bundles 3 can be heated and dried under the heat radiation action of the combustion zone 102 of the hearth by staying in the preheating zone 101 for a certain time; subsequently, the pushing mechanism 2 gradually pushes more straw bundles 3 into the preheating zone 101, so that the straw bundles 3 which enter the preheating zone 101 firstly can gradually move to the following area along with the pushing of the subsequent straw bundles 3; when the straw bundle passes through the combustion area 102, the first air nozzle 105 of the combustion area 102 is arranged on the side wall of the bottom, so that air can be effectively blown to the straw bundle 3, and the effects of reasonable air distribution and effective combustion supporting are achieved; with the progress of combustion, the straw bundles 3 which enter the combustion area 102 first gradually become ash, with the top of the subsequent straw bundles 3, the ash is pushed to the burnout area 103 to continue combustion, the combusted flue gas then enters the upper part of the furnace body 1 to exchange heat with the convection heat exchange tube bundle 106 above the hearth, the flue gas after heat exchange is discharged from the smoke outlet 107, and the burnout ash is pushed to the slag outlet with the entrance of the subsequent straw bundles 3 and is discharged through the slag remover 108.

In the process, the combustion speed is mainly determined by the air supply quantity and the material pushing frequency of the first air nozzle 105, the combustion speed is faster when the air supply quantity is larger and the material feeding frequency is higher, and is slower otherwise. The heat exchange medium in convective heat exchange tube bundle 106 can be water, oil, etc.

Compared with the prior art, the utility model discloses straw bundle burns boiler has cancelled the grate that sets up in furnace, set up pushing equipment 2 outside furnace body 1, the quantity of binding 3 through the gradual increase straw plays the effect that makes furnace interior straw bundle backward movement gradually, carry out direct air distribution through setting up first tuyere 105 at combustion area 102 bottom lateral wall, the effect of carrying out air distribution through the grate has been replaced, and then can make straw bundle 3 fully burn, pushing equipment 2 does not receive the influence of stove high temperature, avoid causing the problem that boiler maintenance cost is high because of the grate damage, the life of boiler has been prolonged, and, the cost that sets up pushing equipment 2 outside furnace body 1 will be far less than the cost that sets up the grate, the manufacturing cost of also greatly reduced's boiler.

The preheating zone 101 is mainly used for preheating and drying, air is not needed for combustion supporting, and therefore, air nozzles are not needed.

As a specific implementation mode of the straw bundle burning boiler provided by the utility model, the convection bank adopts a fire tube mode, which is beneficial to ash removal; the smoke outlet 107 is provided with a purifying and dedusting device for filtering and purifying smoke to reach the emission standard.

As a specific embodiment of the straw-burning boiler of the present invention, please refer to fig. 1, the bottom side wall of the burnout zone 102 is provided with a second tuyere 109. As the combustion progresses, the straw bale 3 that enters the combustion zone 102 first gradually becomes ash, but there may still be some unburnt substances, and as the following straw bale 3 is pushed in, the ash with the unburnt substances is pushed to the burnout zone 103, and the air is effectively blown to the straw bale 3 through the second air nozzle 109 on the bottom side wall of the burnout zone 103, so as to assist the unburnt substances to be completely combusted.

As a specific implementation manner of the embodiment of the present invention, the number of the first nozzles 105 is greater than the number of the second nozzles 109. Because the main process of combustion is completed in the combustion zone 102, the combustion-supporting air quantity required by the combustion zone 102 is more than that of the burnout zone 103, and the purpose of increasing the combustion-supporting air quantity can be well achieved by increasing the number of the air nozzles.

As a specific implementation manner of the embodiment of the present invention, referring to fig. 1, the second tuyere 109 is disposed on the rear side wall of the burnout zone 103. Because the burnout zone 103 is less in length in the front-back direction, the top is communicated with the chamber provided with the heat exchange tube bundle 106, the second air nozzles 109 are only arranged on the two side walls distributed in the front-back direction, and the burnout zone 103 is connected with a slag outlet, so that the problems of insufficient quantity arrangement and unreasonable wind direction arrangement of the second air nozzles 109 and insufficient gas supply can be caused. This embodiment locates the lateral wall behind burnout zone 103 with second tuyere 109, just to the direction that ashes removed, can be more effective fully blow the air to the ashes that are mingled with the unburned material, is favorable to guaranteeing the abundant of burning to go on more.

Referring to fig. 1, a third tuyere 110 is disposed at the top of the combustion area 102 as an embodiment of the present invention. Because the straw fuel has high volatile component content and is rapidly separated out in the state of carbon monoxide and hydrocarbon gas, the combustible gas has low density and is easy to gather at the top of the combustion area 102, and the third air nozzle 110 is used for continuously supplying air at the top of the combustion area 102, so that the combustible gas gathered at the top of the combustion area 102 is continuously combusted, and the combustion sufficiency of the straw fuel is ensured.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, a fourth tuyere 111 is disposed in the middle of the burnout zone 103. Because the burning reaction is also continuously carried out in the burnout zone 103, some combustible gas can be generated, and the fourth tuyere 111 is arranged in the middle of the burnout zone, so that the combustible gas can be fully combusted, and the phenomenon that the combustion reaction is too close to the upper part of the burning zone to damage the convection heat exchange tube bundle 106 is also avoided.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, the fourth tuyere is disposed 111 on the rear sidewall of the burnout zone 103. Because the burnout zone 103 is short in length in the front-rear direction, the top of the burnout zone is communicated with the chamber provided with the heat exchange tube bundle 106, and the fourth air nozzles 111 are only arranged on the two side walls distributed perpendicular to the front-rear direction, so that the problems that the number of the fourth air nozzles 111 is insufficient, the air direction is unreasonable in arrangement, and insufficient air supply is caused may occur. In the embodiment, the fourth air nozzle 111 is arranged on the rear side wall of the burnout zone 103 and is just opposite to the movement direction of the ash, so that the combustible gas separated out from the ash can be blown to the air more effectively, and the full combustion can be ensured.

Specifically, referring to fig. 1, the first air nozzle 105 and the second air nozzle 109 are both communicated with the first air distribution pipe 112, and the third air nozzle 110 and the fourth air nozzle 111 are both communicated with the second air distribution pipe 113. The first air distribution pipe 112 and the second air distribution pipe 113 are distributed along the up-down direction, and the distribution mode is reasonable, the occupied space is small, and the air supply effect is good.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 7, the pushing mechanism 2 includes a receiving tank 201 and a pushing unit 202; the receiving trough body 201 is arranged at the front side of the furnace body 1, an outlet at the end part of the receiving trough body 201 is communicated with the feeding hole 104, and an opening at the top part of the receiving trough body 201 is used for receiving the straw bundle 3; the pushing unit 202 is used for pushing the straw bundle 3 falling into the receiving trough 201 into the feeding hole 104. Wherein, the straw bundles 3 can be sent into the receiving trough 201 by a forklift, a loader or other conveying equipment. The pushing mechanism 2 is reasonable in arrangement, the straw bundle 3 can be conveniently put into the receiving groove body 201, the stroke of the pushing unit 202 is short, the size of the pushing unit 202 is small, the integral structure of the boiler can be more compact and small, and the production cost can be further reduced.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 2 to 6, the pushing end of the pushing unit 202 is provided with a pushing plate 203, and the pushing plate 203 is used for contacting with the straw bundle 3 and for covering the feeding port 104. The material pushing plate 203 is used for pushing the straw bundles 3, and is also used as a furnace door after the straw bundles 3 enter the preheating zone 101, so that a hearth is closed, and the material pushing plate can be opened when the straw bundles need to be fed into the preheating zone again to push the straw bundles again. According to the embodiment, the independently arranged furnace door structure can be eliminated, the furnace body structure is further simplified on the premise of not influencing the combustion of the straw bundle, and the production cost is reduced.

As a specific implementation manner of the embodiment of the utility model, furnace is circular tunnel furnace, and preheating zone 101, combustion zone 102 and burnout zone 103 are circular tunnel promptly. The total of the circular tunnels is not only beneficial to the combustion reaction, but also can strengthen the structure of the furnace body 1 and prolong the service life of the furnace body 1 to a certain extent.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 2 to fig. 6, a protective baffle 204 is further disposed at the top opening of the receiving tank 201 for shielding the portion of the receiving tank 201 close to the feeding port 104. The protective baffle 204 can prevent hot gas from directly rushing out of the feed inlet 104 and being dispersed into the surrounding air when the material is fed, has a certain buffering effect on the hot gas, and can play a certain protective role on operators around the furnace body 1.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 6 and 7, the straw burning boiler further includes an auxiliary feeding mechanism, and the auxiliary feeding mechanism includes a guide baffle 4 and a conveyer belt 5; the guide baffle 4 is arranged around the opening at the top of the receiving tank body 201, the upper ends of the guide baffles 4 incline outwards, and the upper ends of the guide baffles 4 are enclosed to form a guide opening; the conveyor belt 5 serves to convey the straw bales 3 into the guide opening.

According to the foregoing embodiment, the pushing mechanism 2 intermittently pushes the straw bundles, in the present embodiment, the distance between adjacent straw bundles 3 can be set according to the intermittent time of the pushing mechanism 2, and the straw bundles 3 can be fed into the receiving tank 1 one by one at a certain time interval in the state that the conveyor belt 5 continuously operates, corresponding to the feeding frequency, so as to avoid the problem that personnel are too close to the furnace body and are affected by the high temperature around the boiler due to direct feeding into the receiving tank 1. The guide baffle 4 forms a guide structure with a big top and a small bottom, so that the straw bundle 3 can accurately fall into the receiving trough body 1.

In this embodiment, the periphery of the opening at the top of the receiving tank 201 is provided with the guiding baffles 4.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. Straw bale-burning boiler, its characterized in that includes:

2. The straw-baling boiler of claim 1, wherein a bottom sidewall of said burnout zone is provided with a second tuyere.

3. The straw-baling boiler of claim 2, wherein the number of said first tuyeres is greater than the number of said second tuyeres.

4. The straw-baling boiler of claim 2, wherein said second tuyere is disposed in a rear sidewall of said burnout zone.

5. The straw-baling boiler of claim 2, wherein a third tuyere is provided at a top of said combustion zone.

6. The straw-bale-burning boiler according to claim 2, wherein a fourth tuyere is provided at a middle portion of the burnout zone.

7. The straw-baling boiler of claim 6, wherein said fourth tuyere is disposed in a rear sidewall of said burnout zone.

8. The straw-baling boiler of claim 1, wherein said pushing mechanism comprises:

9. The straw-bale-burning boiler according to claim 8, wherein the pushing end of the pushing unit is provided with a pushing plate for contacting with the straw bale and for covering the feeding port.

10. The straw-baling boiler of claim 1, wherein said furnace is a circular tunnel furnace.