CN117663112A - Straw combustion equipment - Google Patents

Abstract

The invention relates to the technical field of biomass straw bundling fuel and provides straw combustion equipment, which comprises a boiler barrel, a combustion chamber, a feed back pushing device and a water-cooling grate arranged in the combustion chamber, wherein the combustion chamber is provided with a feed inlet, one end of the water-cooling grate is arranged at the feed inlet, the boiler barrel is arranged at the outer side of the combustion chamber, the water-cooling grate is communicated with the boiler barrel and is used for enabling water in the water-cooling grate to absorb heat released by straw combustion, part of the feed back pushing device is arranged at one side, away from the feed inlet, of the water-cooling grate in the combustion chamber and is used for pushing back unburned straws on the water-cooling grate to burn again, pushing away incompletely burnt large-package straw fuel and enabling the incompletely burnt large-package straw fuel to fall on a chain grate to burn continuously; the invention can ensure that the straw entering the combustion chamber from the feed inlet burns more fully, and the combustion mode does not need to break the straw bundle.

Description

Straw combustion equipment

Technical Field

The invention relates to the technical field of biomass straw bundling fuel, in particular to straw combustion equipment.

Background

The combustion modes of biomass straw can be generally divided into three types, namely bulk combustion, bundle combustion and compact forming combustion, wherein the bundle combustion has the advantages of high energy per unit volume, moderate density, low transportation cost and the like compared with the bulk combustion; compared with the biomass medium which is densely molded and burned, the bundle burning has the advantages of less electric energy consumption, easy release and utilization of energy and the like, therefore, the bundle burning is a better energy utilization mode of biomass straw.

In the related art, the biomass straw is mainly combusted in a bundling way through straw combustion equipment, wherein the straw combustion device mainly comprises a combustion chamber, and a chain grate and an ash hopper which are arranged in the combustion chamber, wherein a feed inlet is formed in one side wall of the combustion chamber, one end of a transmission grate extends to the feed inlet, the other end of the chain grate extends to the other side wall of the combustion chamber, and the ash inlet is arranged below the end part of the chain grate, which is far away from the feed inlet.

When the straw is burnt, the bundled straw enters from the feed inlet and is ignited, the straw is burnt in the combustion chamber, the chain grate conveys the burnt straw to a direction away from the feed inlet, and finally the burnt straw can be partially changed into ash (such as plant ash) and falls into the ash hopper; however, the problems of incomplete combustion, easy slag bonding on the chain grate and the like can occur in the distance between the feed inlet and the ash hopper on the chain grate.

Disclosure of Invention

The invention solves the problem of how to make the combustion of the bundled straw entering the combustion chamber more complete and fully and reduce the degree of slag bonding.

In order to solve the problems, the invention provides straw combustion equipment, which comprises a boiler barrel, a combustion chamber, a feed back pushing device and a water cooling grate arranged in the combustion chamber, wherein the combustion chamber is provided with a feed port, one end of the water cooling grate is arranged at the feed port, the boiler barrel is arranged at the outer side of the combustion chamber, the water cooling grate is communicated with the boiler barrel and is used for enabling water in the water cooling grate to absorb heat released by straw combustion, a part of the feed back pushing device is arranged at one side, away from the feed port, of the water cooling grate in the combustion chamber and is used for pushing back unburned straws on the water cooling grate to the direction of the feed port for re-combustion and pushing away the incompletely burnt straw fuel in a large package.

Optionally, the feed back pushing device comprises a first telescopic driving part and a pushing piece, wherein the pushing piece is arranged in the combustion chamber, and the first telescopic driving part is connected with the pushing piece and used for driving the pushing piece to linearly reciprocate.

Optionally, the pushing piece includes mounting panel and push pedal, the mounting panel set up in the tip of first flexible drive portion, a plurality of the push pedal is the contained angle setting and respectively with the mounting panel is connected.

Optionally, the feed back thrust unit still includes rotary drive subassembly, rotary drive subassembly set up in the outside of combustion chamber, rotary drive subassembly includes first rotary drive portion, transmission structure, rotary rod and support frame, first rotary drive portion set up in on the support frame, the one end of rotary rod with first flexible drive portion is connected, the rotary rod keep away from the one end of first flexible drive portion with transmission structure transmission is connected, first rotary drive portion with transmission structure drive is connected, is used for through the drive transmission structure with drive the rotary rod with first flexible drive portion rotates.

Optionally, the straw combustion device further comprises a water wall pipe and a water wall header, the water cooling grate comprises a grate header and a water wall pipe, the boiler barrel is communicated with the water wall header through a plurality of water wall pipes, and the water wall header is communicated with a plurality of water wall pipes through the grate header.

Optionally, the water cooling pipes in the water cooling furnace row extend obliquely downwards along the moving direction of the straw.

Optionally, the straw combustion device further comprises a feeding pushing device, wherein the feeding pushing device is arranged at the feeding hole and is used for pushing the straw positioned outside the combustion chamber to the end part of the water-cooling grate at the feeding hole; the feeding pushing device comprises a mounting frame, a second telescopic driving part and a pushing piece, wherein the second telescopic driving part is connected with the mounting frame, and the second telescopic driving part is connected with the pushing piece so as to drive the pushing piece to linearly reciprocate.

Optionally, the straw combustion device further comprises a chain grate and a first ash hopper, the chain grate is arranged below the water-cooling grate, the chain grate is used for conveying straws falling from the water-cooling grate from one end of the combustion chamber away from the feed inlet to a direction close to one end of the feed inlet, and the first ash hopper is arranged at one side of the chain grate close to the feed inlet; the return pushing device is also used for scattering unburnt straws on the water-cooled grate and falling on the chain grate in a loose mode to continue burning.

Optionally, the chain grate comprises a transmission chain, a second rotary driving part, a driving wheel and supporting wheels, wherein a plurality of supporting wheels are arranged at intervals, the transmission chain is wound on the driving wheel and the supporting wheels, and the second rotary driving part is connected with the driving wheel and is used for driving the driving wheel to drive the transmission chain to rotate.

Optionally, the straw combustion device further comprises a blower, an air duct and an air bin, wherein the blower is communicated with the air duct, and a plurality of air bins are arranged below the chain grate at intervals and are respectively communicated with the air duct.

Compared with the prior art, when the bundled straws are subjected to bundling and burning operation, the straws can be firstly put into the end part of the water-cooling grate in the combustion chamber from the feed inlet, then the straws are ignited, the burnt straws can slide on the water-cooling grate, the heat of straw burning can be absorbed by water in the water-cooling grate and is transferred into the boiler barrel through the water medium, so that the temperature of the water-cooling grate is not too high, and the slagging degree of the straws on the water-cooling grate is effectively reduced; when the burnt straws move to one end of the water-cooling grate far away from the feed inlet, if the straw is not completely burnt, the incomplete straw burnt on the water-cooling grate can be pushed back towards the direction of the feed inlet through the return pushing device, so that the combustion path and the combustion time of the straws are increased, the complete straw is continuously burnt, and the large package of fuel corresponding to the unburnt straw is pushed away through the return pushing device, so that the straw entering the combustion chamber from the feed inlet is burnt more fully and completely.

Drawings

Fig. 1 is a schematic structural view of a straw combustion device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a return pushing device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a connection structure between a drum and a water-cooled grate in an embodiment of the present invention;

FIG. 4 is a schematic view of a feed pusher in an embodiment of the present invention;

fig. 5 is a schematic diagram of the position structure of the chain grate and two ash hoppers in the embodiment of the invention.

Reference numerals illustrate:

1-a boiler barrel; 11-a water adding port; 2-combustion chamber; 21-a feed inlet; 22-ash removing port; 23-observation window; 3-a feed back pushing device; 31-a first telescopic drive; 32-pushing member; 321-mounting plates; 322-push plate; 323-separator; 33-a first rotary drive; 34-a transmission structure; 35-rotating the rod; 36-supporting frames; 4-water-cooling fire grate; 41-a fire grate header; 42-a water-cooled tube; 5-a feed pushing device; 51-mounting rack; 52-a second telescopic drive; 53-pushing piece; 6-a chain grate; 61-a transmission chain; 62-supporting wheels; 63-a drive wheel; 7-a first ash hopper; 8-a second ash hopper; 9-a wind bin; 10-water wall tube; 12-a water-cooled wall header.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the coordinate system YZ provided herein, the forward direction of the Y axis represents the front, the reverse direction of the Y axis represents the rear, the forward direction of the Z axis represents the upper, and the reverse direction of the Z axis represents the lower. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

In order to solve the above technical problems, as shown in fig. 1, an embodiment of the present invention provides a straw combustion apparatus, which includes a boiler barrel 1, a combustion chamber 2, a return pushing device 3, and a water-cooled grate 4 disposed in the combustion chamber 2, wherein the combustion chamber 2 is provided with a feed inlet 21, one end of the water-cooled grate 4 is disposed at the feed inlet 21, the boiler barrel 1 is disposed at the outside of the combustion chamber 2, the water-cooled grate 4 is communicated with the boiler barrel 1, and is used for making water in the water-cooled grate 4 absorb heat released by straw combustion, and a part of the return pushing device 3 is disposed at a side of the water-cooled grate 4 in the combustion chamber 2 away from the feed inlet 21, and is used for pushing back unburned straw on the water-cooled grate 4 to the direction of the feed inlet 21 for re-combustion, and for pushing away incompletely burned large-package straw fuel.

It should be noted that, the water is contained in the boiler barrel 1, the combustion chamber 2 is used for providing a combustion space for bundled straws, and the boiler barrel 1 can be arranged above the combustion chamber 2 or at other positions of the combustion chamber 2; the water-cooled grate 4 not only can be used as a conveying track for bundled straws, the burnt straws slide on the water-cooled grate 4, but also the water-cooled grate 4 is used for absorbing heat generated by straw combustion, so that the temperature of the water-cooled grate 4 is not too high, and the degree of slagging of the straws on the water-cooled grate 4 is reduced.

Wherein, the side wall of the combustion chamber 2 opposite to the feed port 21 may be defined as a front side wall of the combustion chamber 2, and the side wall of the combustion chamber 2 having the feed port 21 may be defined as a rear side wall of the combustion chamber 2; specifically, the bundled straw can move in the direction of the inside (front side wall) of the combustion chamber 2 along the extending direction of the water-cooled grate 4 after entering the combustion chamber 2 from the feed port 21 of the rear side wall of the combustion chamber 2; the feed back pushing device 3 can be arranged at the front side of the water-cooled grate 4, when the bundling straw in a burning state moves from one end of the water-cooled grate 4 close to the feeding hole 21 to the front end of the water-cooled grate 4, if the bundling straw is not fully burnt (incomplete burning), the straw on the water-cooled grate 4 can be pushed back backwards through the feed back pushing device 3, which is equivalent to increasing the moving distance of the bundling straw on the water-cooled grate 4, so that the burning time of the bundling straw is increased, and the straw which is not fully burnt before is completely burnt.

When the bundled straws are subjected to bundling and burning operation, the straws can be firstly placed at the end part of the water-cooling grate 4 in the combustion chamber 2 from the feed inlet 21, then the straws are ignited, the burnt straws can slide on the water-cooling grate 4, the water in the water-cooling grate 4 can absorb the heat of straw burning, and the heat is transferred into the boiler barrel through the water medium, so that the temperature of the water-cooling grate 4 is not too high, and the slagging degree of the straws on the water-cooling grate 4 is effectively reduced; when the burnt straws move to one end of the water-cooled grate 4 far away from the feed inlet 21, if the straw is not completely burnt, the unburned straws on the water-cooled grate 4 can be pushed back to the direction of the feed inlet 21 through the return pushing device 3, which is equivalent to increasing the burning path of the straws at the moment, so that the unburned straws continue to burn, and the ladle fuel corresponding to the unburned straws is pushed away through the return pushing device 3, so that the straw entering the combustion chamber 2 from the feed inlet 21 can be burnt more fully and completely.

In one embodiment of the invention, a viewing window 23 is provided in the side wall of the combustion chamber 2 at a position opposite to the water cooled grate 4.

It should be noted that, the observation window 23 may be a glass window, and by arranging the observation window 23 on the side wall of the combustion chamber 2, a worker can conveniently check the combustion condition of bundling straw on the water-cooled grate 4 in the combustion chamber 2 at any time through the observation window 23; and whether the feed back pushing device 3 is started or not can be selected according to the combustion condition of the straws on the water-cooling grate 4; for example, if the straw on the water-cooled grate 4 is not completely combusted, the return pushing device 3 can be started manually to push the straw on the water-cooled grate 4 back towards the direction of the feeding hole 21, so that the straw continues to be combusted, and the straw is combusted more fully.

In one embodiment of the present invention, as shown in fig. 2, the feed back pushing device 3 includes a first telescopic driving portion 31 and a pushing member 32, where the pushing member 32 is disposed in the combustion chamber 2, and the first telescopic driving portion 31 is connected to the pushing member 32, and is used for driving the pushing member 32 to reciprocate linearly.

It should be noted that, the pushing member 32 is disposed in the combustion chamber 2, so that the pushing member 32 is disposed outside the combustion chamber 2, which may cause the pushing member 32 to strike the sidewall of the combustion chamber 2 or not smoothly enter the combustion chamber 2 due to offset during the straw pushing process, so that the pushing member 32 does not need to pass through the combustion chamber 2 each time, thereby prolonging the service lives of the pushing member 32 and the combustion chamber 2. The first telescopic driving section 31 may be provided inside the combustion chamber 2 or outside the combustion chamber 2; in addition, the first telescopic driving part 31 is connected with the pushing member 32, so that whether the first telescopic driving part 31 drives the pushing member 32 to linearly reciprocate can be controlled according to the combustion condition of the straw in the combustion chamber 2.

The pushing member 32 linearly reciprocates under the driving action of the first telescopic driving portion 31, so that the ash residue on the water-cooled grate 4 is scraped by the driving action of the bundled straw in the process of pushing back the straw on the water-cooled grate 4, and the slagging degree on the water-cooled grate 4 can be correspondingly reduced.

Specifically, the first telescopic driving section 31 may be a telescopic electric cylinder, a telescopic air cylinder, a telescopic oil cylinder, an electric push rod, or the like; the pushing member 32 is used for directly acting on the straw, so the pushing member 32 is made of high temperature resistant material.

In one embodiment of the present invention, as shown in fig. 2, the pushing member 32 includes a mounting plate 321 and a pushing plate 322, the mounting plate 321 is disposed at an end of the first telescopic driving portion 31, and a plurality of pushing plates 322 are disposed at an included angle and are respectively connected to the mounting plate 321.

It should be noted that, since the mounting plate 321 is disposed at the end of the first telescopic driving portion 31, the mounting plate 321 provides a mounting base for mounting the push plate 322; the push plate 322 is arranged at an included angle and is respectively connected with the mounting plate 321, so that the push plate 322 can be partially inserted into bundled straws on the basis of increasing the contact area with the straws, the left and right offset of the straws is prevented, the straws which are incompletely combusted can be fully and directionally pushed back at one time, the pushing back times of the pushing piece 32 are reduced, and the energy is correspondingly saved.

Wherein, one end of a plurality of push plates 322 is connected with the mounting plate 321 respectively, and one end of a plurality of push plates 322 far away from the mounting plate 321 can be in annular arrangement, so that the contact area with the straw can be increased.

The pushing member 32 further comprises a partition plate 323, a conical cavity is formed between each pushing plate 322, the partition plate 323 is arranged in the conical cavity, and a gap is reserved between the partition plate 323 and one end, far away from the mounting plate 321, of each pushing plate 322, so that each pushing plate 322 and each mounting plate 321 are connected through the partition plate 323 to form an integrated structure, the mechanical strength of the whole pushing member 32 is correspondingly enhanced, and through the gap between the partition plate 323 and the end part of the pushing plate 322, part of the structure of the pushing plate 322 is inserted into bundled straws, so that the pushing member 32 can push all uncombusted straws back in a directional manner, offset dislocation is avoided when the uncombusted straws are pushed back relative to the pushing member 32, and the pushing member 32 can be prevented from being pushed back in the returning process after pushing the straws back.

In one embodiment of the present invention, as shown in fig. 2, the feed back pushing device 3 further includes a rotation driving assembly, where the rotation driving assembly is disposed on the outer side of the combustion chamber 2, the rotation driving assembly includes a first rotation driving portion 33, a transmission structure 34, a rotating rod 35, and a supporting frame 36, the first rotation driving portion 33 is disposed on the supporting frame 36, one end of the rotating rod 35 is connected to the first telescopic driving portion 31, one end of the rotating rod 35, which is far away from the first telescopic driving portion 31, is in transmission connection with the transmission structure 34, and the first rotation driving portion 33 is in driving connection with the transmission structure 34, so as to drive the rotating rod 35 and the first telescopic driving portion 31 to rotate by driving the transmission structure 34.

It should be noted that the supporting frame 36 provides a mounting base for the first rotation driving portion 33; the rotary driving component is arranged at the outer side of the combustion chamber 2, so that the damage of the high Wen Duixuan rotary driving component in the combustion chamber 2 can be effectively prevented; the rotary driving assembly is used for driving the first telescopic driving part 31 to rotate so as to drive the pushing piece 32 to rotate, so that the straws on the water-cooling grate 4 rotate, and the straws are pushed back in a rotary manner on the basis of linear movement, so that the combustion speed of the straws is improved.

Specifically, if the straw on the water-cooled grate 4 is not completely combusted, the whole feed back pushing device 3 can perform two movements, one is to control the first telescopic driving part 31 to work so as to drive the pushing member 32 to linearly move towards the direction of the feeding hole 21, so as to push the straw on the water-cooled grate 4 which is not completely combusted back to continue to be combusted, thereby making the straw combusted more fully. Secondly, in the process of pushing back the straw, the first rotary driving part 33 works to drive the transmission structure 34 to operate, the transmission structure 34 drives the rotary rod 35 to rotate around the central axis of the rotary rod, then the rotary rod 35 drives the first telescopic driving part 31 and the pushing part 32 to rotate, at this time, the pushing part 32 can make the straw move linearly towards the direction of the feeding hole 21, and also move rotationally, so that the contact area of the straw and high-temperature air in the combustion chamber 2 is increased, and the combustion stroke of the straw is correspondingly increased, so that the combustion speed of the unburnt complete straw is effectively increased again.

In one embodiment of the present invention, as shown in connection with fig. 3, the straw combustion apparatus further comprises a water wall pipe 10 and a water wall header 12, the water-cooled grate 4 comprises a grate header 41 and a water wall pipe 42, the boiler barrel 1 is communicated with the water wall header 12 through a plurality of water wall pipes 10, and the water wall header 12 is communicated with a plurality of water wall pipes 42 through the grate header 41.

It should be noted that, the top of the boiler barrel 1 may be provided with a water inlet 11 and an air outlet, the boiler barrel 1 is provided with a plurality of connection holes, each connection hole is respectively communicated with one end of each water wall pipe 10, one end of each water wall pipe 10 is respectively connected with the water wall header 12, the plurality of water wall headers 12 are respectively communicated with the fire grate header 41, the plurality of water wall pipes 42 are respectively communicated with the fire grate header 41, so that water in the boiler barrel 1 is communicated with the water wall header 12, the fire grate header 41 and the water wall pipes 42 through the water wall pipes 10, thereby completing heat transfer, the water rises to the boiler barrel 1 due to severe pressure difference, separates in the boiler barrel 1, and the water is supplemented to the water wall pipes 42 through the fire grate header 41 for continuous heating.

Specifically, the number of the water wall tubes 10 may be plural, so that the absorption effect of the water wall tubes 10 on the combustion heat of the straw in the combustion chamber 2 can be improved by increasing the contact area with the high-temperature gas in the combustion chamber 2. The fire grate header 41 is used for communicating the water-cooled wall header 12 with the water-cooled tubes 42, the water-cooled tubes 42 are arranged at intervals, and bundled straws can move on the water-cooled tubes 42. The water wall header 12 includes a plurality of water conduit structures disposed in spaced relation and the grate header 41 includes at least one water conduit structure.

Referring to fig. 3, the drum 1, the water wall pipe 10, the water wall header 12 and the water-cooled grate 4 may transfer heat through an aqueous medium, and may be one group or two or more groups, depending on the power required by the user.

In one embodiment of the present invention, as shown in fig. 1, the water cooling pipes 42 of the water cooling grate 4 extend obliquely downward in the moving direction of the straw.

It should be noted that the water-cooled tube 42 in the water-cooled grate 4 extends obliquely downward along the moving direction of the straw, in other words, the water-cooled tube 42 in the water-cooled grate 4 gradually slopes downward from one end of the feed inlet 21 to one end far away from the feed inlet 21, so that when the bundled straw enters the end of the feed inlet 21 of the water-cooled grate 4, the bundled straw can slide downward along the water-cooled tube 42 of the water-cooled grate 4 due to the self-gravity, so that the straw does not need to be additionally applied with thrust by other devices after entering the feed inlet 21, and the energy consumption of other devices is saved.

In one embodiment of the present invention, as shown in fig. 1 and 4, the straw combustion apparatus further comprises a feeding pushing device 5, wherein the feeding pushing device 5 is disposed at the feeding hole 21 and is used for pushing the straw outside the combustion chamber 2 onto the end of the water-cooled grate 4 at the feeding hole 21; the feeding pushing device 5 comprises a mounting frame 51, a second telescopic driving part 52 and a pushing piece 53, wherein the second telescopic driving part 52 is connected with the mounting frame 51, and the second telescopic driving part 52 is connected with the pushing piece 53 so as to drive the pushing piece 53 to linearly reciprocate.

It should be noted that, by arranging the feeding pushing device 5 at the feeding port 21, a pushing force can be applied to the bundled straws outside the combustion chamber 2 so as to push the bundled straws to the end portion of the water-cooled grate 4 at the feeding port 21, and then the bundled straws automatically slide down due to the self gravity by utilizing the characteristic that the water-cooled grate 4 extends obliquely downwards, or the bundled straws on the water-cooled grate 4 can be pushed to slide down by the feeding pushing device 5, so that manual output is not needed, and the labor cost is correspondingly reduced, so that the automatic feeding operation of the bundled straws is realized.

Specifically, the mounting frame 51 provides a mounting foundation for the second telescopic driving part 52, and the second telescopic driving part 52 is connected with the pushing piece 53 and is used for driving the pushing piece 53 to reciprocate linearly so as to push bundled straws outside the combustion chamber 2 to the end part of the water-cooled grate 4 in the combustion chamber 2 at the feed inlet 21, thereby realizing automatic feeding operation of the straws. The pushing piece 53 may be in a plate structure, and the pushing piece 53 and the second telescopic driving part 52 are arranged at an included angle, so as to smoothly push the straw outside the combustion chamber 2 to move linearly; the second telescopic driving section 52 may be a telescopic cylinder, an electric push rod, or the like.

In one embodiment of the present invention, as shown in fig. 1 and 5, the straw combustion apparatus further includes a traveling grate 6 and a first ash hopper 7, the traveling grate 6 is disposed below the water-cooled grate 4, the traveling grate 6 is used for conveying the straws dropped from the water-cooled grate 4 from one end of the combustion chamber 2 away from the feed inlet 21 to a direction approaching to one end of the feed inlet 21, and the first ash hopper 7 is disposed on one side of the traveling grate 6 approaching to the feed inlet 21; the return pushing device 3 is also used for scattering unburnt straws on the water-cooled grate 4 and falling on the chain grate 6 in a loose form for continuous combustion.

It should be noted that, the traveling grate 6 is disposed below the water-cooling grate 4, the traveling grate 6 is configured to convey the straw dropped from the water-cooling grate 4 from the end of the combustion chamber 2 away from the feed inlet 21 to the end close to the feed inlet 21, in other words, the combustion principle of the straw is that, after the straw enters the combustion chamber 2 from the feed inlet 21, the straw pushes the front straw bundle to travel into the combustion chamber by means of the new straw bundle to complete the heating, drying, firing and combustion processes of the straw bundle, wherein the straw bundle of the water-cooling grate 4 located at the upper part is scattered after firing, the loose straw drops onto the traveling grate 6 located at the lower part through the gap between the two adjacent water-cooling pipes 42 in the water-cooling grate 4 during the travel process, and all drops onto the traveling grate 6 located at the lower part at the end (front end) of the water-cooling grate 4, then the straw which falls on the lower chain grate 6 is loose and burns incompletely and has smaller volume and the advancing direction of the straw bundle on the upper water-cooling grate 4 is opposite, in other words, the chain grate 6 rotates anticlockwise, so that the straw which falls on the water-cooling grate 4 and falls on the chain grate 6 is conveyed to the direction of the feeding port 21, the burning and burning of the falling loose straw are completed, the burnt ash is discharged into the first ash hopper 7, in the process, the lower chain grate 6 burns the loose straw under the action of the air bin 9, the hot flue gas generated by burning passes through the upper water-cooling grate 4 and the straw bundle to heat, dry, ignite and burn the straw bundle, thereby not only the burning stroke and burning time of the incomplete straw are increased by the chain grate 6, but also the straw on the chain grate 6 burns more fully, and the straw which is continuously combusted on the chain grate 6 can also provide heat for the straw which is not combusted and is being combusted on the water-cooled grate 4 so as to dry the straw on the water-cooled grate 4, thereby improving the combustion effect on the water-cooled grate 4.

In addition, the embodiment of the invention adopts the arrangement of the upper and lower double-layer grates, which is different from the single-layer grate combustion mode of the straw bundle in the prior art, and solves the problems of insufficient combustion and low efficiency caused by the fact that the moisture content of the straw bundle is high, the drying and firing processes are long, and the limited combustion space and time are shortened. The combustion mode of the invention does not need to break bags for straw bundles, and solves the problems of equipment investment and combustion caused by breaking bag faults caused by adopting a front breaking mode in most straw bundle combustion furnaces at present.

The first ash hopper 7 is arranged on one side, close to the feeding hole 21, of the chain grate 6, so that the straw which is completely combusted on the chain grate 6 automatically falls to the first ash hopper 7 from one end, close to the feeding hole 21, and the automatic collection of ash which is completely combusted on the chain grate 6 is realized.

In addition, the projection point of the end of the water-cooled grate 4, which is far away from the feed inlet 21 and is in the vertical direction, falls on the chain grate 6, so that the straws of the water-cooled grate 4, which are far away from the feed inlet 21, can be ensured to fall on the chain grate 6 completely, and the straws which are incompletely combusted on the water-cooled grate 4 can be effectively prevented from directly falling on the bottommost part of the combustion chamber 2, so that the waste of the straws is caused.

The areas where the straws on the water-cooling grate 4 and the chain grate 6 pass in the process of being conveyed can be divided into four sections, namely a preheating drying section, a volatile separation and combustion section, a coke combustion section and a burning-out section, wherein the straws falling onto the chain grate 6 from the water-cooling grate 4 can provide heat for the straws of the volatile analysis and the gas sections on the water-cooling grate 4 in the coke section of the chain grate 6 so as to improve the combustion efficiency of the straws in the volatile analysis and the gas sections on the water-cooling grate 4, and the burning-out section of the chain grate 6 can provide heat for the straws of the preheating drying section on the water-cooling grate 4 so as to improve the drying speed of the straws in the preheating drying section on the water-cooling grate 4 and further improve the combustion efficiency and the combustion effect for the combustion operation of the straws in other sections on the water-cooling grate 4.

In one embodiment of the invention, the straw burning device further comprises a second ash hopper 8, wherein the second ash hopper 8 is arranged at one side of the chain grate 6 away from the feeding hole 21.

It should be noted that, the second ash hopper 8 may be disposed below a side of the chain grate 6 away from the feed inlet 21, and at this time, the second ash hopper 8 is also disposed below the water-cooled grate 4, so that the straws on one end of the water-cooled grate 4 and the chain grate 6 away from the feed inlet 21 fall into the second ash hopper 8 even if they fall, thereby realizing automatic collection of the straws on the water-cooled grate 4 that do not fall onto the chain grate 6.

In addition, as shown in fig. 5, the combustion chamber 2 is further provided with two ash removal openings 22 corresponding to the first ash hopper 7 and the second ash hopper 8, wherein the two ash removal openings 22 can be arranged at one side of the first ash hopper 7 and the second ash hopper 8, for example, at the lower part, so that a worker can take out the first ash hopper 7 and the second ash hopper 8 filled with ash through the two clean water openings respectively for cleaning.

In one embodiment of the present invention, as shown in fig. 5, the chain grate 6 includes a transmission chain 61, a second rotary driving part, a driving wheel 63 and supporting wheels 62, wherein a plurality of the supporting wheels 62 are spaced apart, the transmission chain 61 is wound around the driving wheel 63 and the supporting wheels 62, and the second rotary driving part is connected to the driving wheel 63 and is used for driving the driving wheel 63 to rotate the transmission chain 61.

It should be noted that, the supporting wheels 62 are arranged at intervals, so as to provide support for the installation of the driving chain 61, wherein the driving chain 61 can be wound on the driving wheel 63 and the supporting wheels 62, and is connected with the driving wheel 63 through the second rotary driving part, so that the driving wheel 63 is driven to rotate, and the whole driving chain 61 is driven to rotate, wherein the driving chain 61 rotates anticlockwise, so that the incomplete-burning straw on the driving chain 61 falling onto the chain grate 6 from the water-cooled grate 4 is conveniently transmitted from the front end to the rear end, and the burning travel and burning time of the straw are further increased, so that the straw is burnt more fully.

In one embodiment of the present invention, as shown in fig. 5, the straw combustion apparatus further includes a blower, an air duct and an air bin 9, wherein the blower is communicated with the air duct, and a plurality of air bins 9 are spaced below the chain grate 6 and are respectively communicated with the air duct.

It should be noted that, the air blower can be arranged in the combustion chamber 2, the air blower can be communicated with the air inlet of the air duct, the air outlet of the air duct is respectively communicated with a plurality of air bins 9, and the air bins 9 are arranged below the communicated fire grate at intervals, so that the air blower blows air outside the combustion chamber 2 to the chain fire grate 6 through the air duct via the air bins 9, and the air can also pass through the chain fire grate 6 to blow to the water-cooled fire grate 4, thereby not only providing oxygen for the combustion of straws on the chain fire grate 6 and the water-cooled fire grate 4, but also playing a drying role, and correspondingly improving the combustion effect and efficiency of the straws on the chain fire grate 6 and the water-cooled fire grate 4.

In addition, a valve is further arranged at each air bin 9, and the air output of the air bin 9 can be controlled through the valve, so that the straw on the water-cooling grate 4 and the chain grate 6 can be combusted more fully.

Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. The utility model provides a straw combustion apparatus, its characterized in that, including drum (1), combustion chamber (2), feed back thrust unit (3) and set up in water-cooled grate (4) in combustion chamber (2), combustion chamber (2) are equipped with feed inlet (21), water-cooled grate (4) one end set up in feed inlet (21) department, drum (1) set up in the outside of combustion chamber (2), water-cooled grate (4) with drum (1) intercommunication is used for making water in water-cooled grate (4) absorbs the heat that straw burning released, feed back thrust unit (3) part set up in one side of water-cooled grate (4) in combustion chamber (2) keep away from feed inlet (21) for with unburned complete straw on water-cooled grate (4) to the direction of feed inlet (21) is pushed back in order to carry out the reburning, and carries out the dispersion to the straw fuel that does not have completely burnt.

2. Straw combustion device according to claim 1, characterized in that the return pushing means (3) comprises a first telescopic driving part (31) and a pushing member (32), the pushing member (32) is arranged in the combustion chamber (2), and the first telescopic driving part (31) is connected with the pushing member (32) and is used for driving the pushing member (32) to reciprocate linearly.

3. The straw combustion device according to claim 2, wherein the pushing member (32) comprises a mounting plate (321) and pushing plates (322), the mounting plate (321) is arranged at the end part of the first telescopic driving part (31), and a plurality of pushing plates (322) are arranged at included angles and are respectively connected with the mounting plate (321).

4. The straw combustion apparatus according to claim 2, wherein the return pushing device (3) further comprises a rotation driving assembly, the rotation driving assembly is arranged on the outer side of the combustion chamber (2), the rotation driving assembly comprises a first rotation driving part (33), a transmission structure (34), a rotating rod (35) and a supporting frame (36), the first rotation driving part (33) is arranged on the supporting frame (36), one end of the rotating rod (35) is connected with the first telescopic driving part (31), one end of the rotating rod (35) away from the first telescopic driving part (31) is in transmission connection with the transmission structure (34), and the first rotation driving part (33) is in driving connection with the transmission structure (34) and is used for driving the rotating rod (35) and the first telescopic driving part (31) to rotate by driving the transmission structure (34).

5. The straw combustion device according to claim 1, further comprising a water wall pipe (10) and a water wall header (12), wherein the water-cooled grate (4) comprises a grate header (41) and a water wall pipe (42), the boiler barrel (1) is communicated with the water wall header (12) through a plurality of water wall pipes (10), and the water wall header (12) is communicated with a plurality of water wall pipes (42) through the grate header (41).

6. The straw burning device according to claim 5, characterized in that the water cooling pipes (42) in the water cooling grate (4) extend obliquely downwards in the direction of movement of the straw.

7. The straw combustion device according to claim 6, further comprising a feed pushing device (5), the feed pushing device (5) being arranged at the feed inlet (21) for pushing straw outside the combustion chamber (2) onto the end of the water-cooled grate (4) at the feed inlet (21); the feeding pushing device (5) comprises a mounting frame (51), a second telescopic driving part (52) and a pushing piece (53), wherein the second telescopic driving part (52) is connected with the mounting frame (51), and the second telescopic driving part (52) is connected with the pushing piece (53) so as to drive the pushing piece (53) to reciprocate linearly.

8. The straw combustion device according to any one of claims 1 to 7, further comprising a traveling grate (6) and a first ash hopper (7), wherein the traveling grate (6) is arranged below the water-cooled grate (4), the traveling grate (6) is used for conveying straws falling off from the water-cooled grate (4) from one end of the combustion chamber (2) away from the feed inlet (21) to a direction close to one end of the feed inlet (21), and the first ash hopper (7) is arranged at one side of the traveling grate (6) close to the feed inlet (21); the return pushing device (3) is also used for scattering unburnt straws on the water-cooled grate (4) and falling on the chain grate (6) in a loose mode to continue burning.

9. The straw combustion device according to claim 8, wherein the chain grate (6) comprises a transmission chain (61), a second rotary driving part, a driving wheel (63) and supporting wheels (62), a plurality of the supporting wheels (62) are arranged at intervals, the transmission chain (61) is wound on the driving wheel (63) and the supporting wheels (62), and the second rotary driving part is connected with the driving wheel (63) and is used for driving the driving wheel (63) to drive the transmission chain (61) to rotate.

10. The straw combustion device according to claim 8, further comprising a blower, an air duct and an air bin (9), wherein the blower is communicated with the air duct, and a plurality of the air bins (9) are arranged below the chain grate (6) at intervals and are respectively communicated with the air duct.