CN220489179U - Assembled air inlet grate and low-nitrogen combustion device - Google Patents

Abstract

The utility model discloses an assembled air intake grate and a low-nitrogen combustion device, which comprises a grate plate and a plurality of hanging pieces, wherein the hanging pieces are vertically arranged and distributed along the circumferential direction, one side of the upper end of each hanging piece, which is far away from each other, is provided with a hanging part, one side of the lower end of each hanging piece, which is close to each other, is provided with a supporting part, the grate plate is horizontally arranged among the hanging pieces and supported at the supporting parts of the hanging pieces to jointly enclose a groove-shaped containing tank, the containing tank is used for containing biomass particle fuel, the hanging parts at the upper ends of the hanging pieces are used for being hung on the inner wall of a furnace body, the hanging pieces or the two adjacent hanging pieces are provided with first air inlets penetrating through the side wall of the containing tank, and the upper ends of the hanging pieces or the upper ends of the two adjacent hanging pieces are provided with second air inlets penetrating up and down.

Description

Assembled air inlet grate and low-nitrogen combustion device

Technical Field

The utility model belongs to the field of biomass low-nitrogen gasification combustion devices, and particularly relates to an assembled air inlet grate and a low-nitrogen combustion device.

Background

The biomass granular fuel is a clean renewable energy source and has the advantages of large supply quantity, wide source, small pollution and the like, the biomass granular fuel consists of combustible matters, inorganic matters and moisture, the elements of the biomass granular fuel are mainly C, H and O, the biomass granular fuel contains a small amount of N and S, and pollutants generated by the combustion of the biomass granular fuel are CO and NO _x And particulate matter emissions are dominant, so CO, NO _x PM is also a primary control objective for biomass pellet fuel combustion pollutant emissions. The type and performance of biomass pellet fuel, the design structure of boiler and burner, feeding mode and air inlet mode, and the parameter of feeding and air inlet all have very big influence to the emission of pollutant, and the biomass stove that currently generally uses installs the burner on original equipment more, or installs the rough transformation of feed system on original coal fired boiler to form, do not accord with biomass pellet fuel low nitrogen combustion characteristic, discharge and generally exceed standard. In the air inlet position, the primary air inlet of the existing biomass particle fuel stove mainly enters the bottom of a hearth, oxygen required by pyrolysis gasification and fixed carbon combustion of biomass particle fuel is provided, and in order to obtain stronger fire, the phenomenon of overlarge air inlet flow rate (the air inlet flow rate refers to the volume of air passing through a combustion chamber in unit time) is generally caused, ash particles generated in the bottom and fuel combustion can be entrained by the overlarge air inlet flow rate, the mass concentration of particles discharged by fuel combustion is increased, the overlarge air inlet flow rate can also cause the violent combustion of the biomass particle fuel to generate high temperature so as to increase the conversion rate of N element in the biomass particle fuel, and meanwhile NO is increased _x The higher temperature can lead the burnt biomass particles to be in a molten or semi-molten state, the burnt phenomenon can occur when the temperature for exhausting the combustible is reduced, if the burnt is serious (note that the types and the performances of the biomass particles are different and the coking degree is greatly influenced)The combustion effect of the biomass granular fuel is affected, the fuel is not fully combusted, the thermal efficiency is reduced, the discharged pollutants are increased, the fuel can not be normally combusted to cause flameout particularly seriously, if the fuel with low coking rate is selected, the cost is increased, so that the coking of the biomass granular fuel in the combustion is also a difficult problem in the biomass combustion technology, in addition, the fire grate of the existing biomass combustion furnace is in a grate plate shape, only the biomass particles on the grate plate can enter the combustion chamber when air penetrates through the grate plate from bottom to top, and at the moment, the contact of the biomass granular fuel and the air is more sufficient, so that the biomass granular fuel is vigorously combusted to be coked.

Disclosure of Invention

In order to solve the technical problems, one of the purposes of the utility model is to provide an assembled air inlet grate which has a simple structure and is assembled.

In order to achieve the above object, the technical scheme of the present utility model is as follows: the utility model provides an assembled air inlet grate, includes comb board and a plurality of articulated elements, a plurality of articulated elements all vertical setting to along the hoop distribution, every articulated element upper end one side that keeps away from each other is provided with the articulated portion, every articulated element lower extreme one side that is close to each other has the portion of holding up, the comb board level sets up a plurality of between the articulated elements, and holds in the palm a plurality of articulated element hold up the portion department and enclose into the accommodation pool of cell body shape jointly, hold in the pond and be used for holding living beings pellet fuel, a plurality of articulated portion of articulated element upper end is used for the link-up on the inner wall of furnace body, on the articulated element or two adjacent articulated element have link up hold the first inlet port of pool lateral wall, the upper end of articulated element or two adjacent have the second inlet port that runs through from top to bottom between the articulated element upper end.

The beneficial effects of the technical scheme are that: through adopting a plurality of articulations to be annular articulations on the oven of furnace body, and the comb board then holds in the level hold in between a plurality of articulations, this moment comb board and a plurality of articulations enclose into cell body shaped structure jointly, its equipment is convenient, and can carry out local change maintenance when local damage, because the ash hole that falls that runs through from top to bottom (the ashes that produces after supplying the biomass pellet fuel burning above the comb board drop downwards, because the stack of top of this grate comb board has biomass pellet fuel, so the air of the below of comb board can not flow upwards through ash hole), and the air of this pin-connected panel below can mainly be through the region between articulations and the furnace body inner wall and finally enter into the holding tank through first inlet port and supply biomass pellet fuel pyrolysis gasification, and the remainder can enter into the top of holding tank through the second inlet port, wherein the biomass pellet fuel pyrolysis gasification of holding tank bottom is combustible gas, combustible gas upwards overflows the top of holding tank, and mix the fire that carries out with air after violent burning in holding tank.

In the above technical scheme, the hanging piece comprises a vertical rod, a bottom rod and a rod head, wherein the vertical rod is vertically arranged, the bottom rod is horizontally arranged along the inner direction and the outer direction, the lower end of the vertical rod is vertically connected with the middle part of the upper end of the bottom rod, the inner end of the bottom rod forms a supporting part of the hanging piece, the outer end of the bottom rod forms an abutting part of the hanging piece, the abutting part is used for abutting against the inner wall of the furnace body, the upper end of the vertical rod is connected with the inner lower end of the rod head, a notch which transversely penetrates is concavely arranged at the outer lower end of the rod head upwards, and the notch forms the hanging part of the hanging piece.

The beneficial effects of the technical scheme are that: the vertical rod is simple in structure, and when the abutting part of the outer end of the bottom rod abuts against the inner wall of the furnace body, the vertical rod can be ensured to be vertical, and meanwhile the hanging piece is prevented from shaking.

In the technical scheme, the upper end of the club head is an inclined surface which is inclined from inside to outside and upwards.

The beneficial effects of the technical scheme are that: therefore, the biomass granular fuel is prevented from being deposited at the upper end of the club head.

In the technical scheme, the inner upper end of the bottom rod is an inclined surface inclined from outside to inside and downwards, and the edge of the grid plate is supported at the inner upper end of the bottom rod.

The beneficial effects of the technical scheme are that: so that the edge of the grate plate is supported at the inner upper end of the bottom rod, thereby extruding the bottom rod outwards, and the abutting part is more firmly abutted with the inner wall of the furnace body.

According to the technical scheme, one side, close to each other, of each adjacent two club heads extends to be mutually attached, one side, close to each other, of each inner end of each adjacent two bottom rods extends to be mutually attached, one side, close to each other, of each outer end of each adjacent two bottom rods is provided with a clearance which penetrates through up and down so as to form a vent hole together with the inner wall of the furnace body, and a clearance is formed between each two adjacent vertical rods so as to form the first air inlet hole.

The beneficial effects of the technical scheme are that: so a plurality of pole settings have an annular cavity with the furnace body inner wall between, and the air vent of two adjacent sill bars inner makes the air of this pin-connected panel air inlet grate below can enter into the annular cavity through the air vent in, and the air in the annular cavity can enter into the accommodation pond through first inlet port in, encloses jointly through setting up the clearance between two adjacent pole settings and closes and form first inlet port, makes it assemble more convenient like this.

According to the technical scheme, two sides of each club head are respectively provided with the grooves which vertically penetrate through in a concave mode, the lower ends of the grooves are located on the outer sides of the corresponding vertical rods, and the grooves on the adjacent two club heads, which are close to one side of each other, enclose together to form the second air inlet hole.

The beneficial effects of the technical scheme are that: so that the grooves on one side of the adjacent two club heads, which are close to each other, enclose the second air inlet hole, and air in the annular cavity can enter the upper part of the assembled air inlet fire grate through the second air inlet hole.

Another object of the present utility model is to provide a low-nitrogen combustion device which has a simple structure and can realize low-nitrogen combustion.

In order to achieve the above object, another technical solution of the present utility model is as follows: the utility model provides a low nitrogen burner, includes furnace body and pin-connected panel air inlet grate as above, middle part department in the furnace body annular is protruding to be equipped with the link that the level set up, pin-connected panel air inlet grate is arranged in the furnace body, and through a plurality of the articulated portion of articulated piece articulates on the link, pin-connected panel air inlet grate will the furnace body inside is cut apart and is being located the combustion chamber of top and the deashing room that is located the below, have on the lateral wall of furnace body with the deashing mouth that the deashing room link up, deashing mouth department is provided with the ash door, have on the lateral wall of furnace body with the primary air inlet of deashing room intercommunication and with the overgrate air inlet of combustion chamber intercommunication, primary air inlet and overgrate air inlet department all are used for with the air outlet intercommunication of fan, and are provided with the air volume governing valve at the intercommunication punishment.

The beneficial effects of the technical scheme are that: the split type air inlet grate is simple in structure, the split type air inlet grate is used in the furnace body, the split type air inlet grate is convenient to manufacture and maintain, and combustible gas generated after biomass pellet fuel pyrolysis is combusted more fully in the combustion chamber with air introduced from the secondary air inlet.

The technical proposal also comprises a feeding auger, a discharge port of the feeding auger penetrates into the furnace body and is positioned in the middle part of the combustion chamber, the feeding auger is used for feeding biomass granular fuel into the combustion chamber.

The beneficial effects of the technical scheme are that: the biomass pellet fuel storage tank is simple in structure, so that biomass pellet fuel is piled up in a conical shape when being sent into the storage tank, and the biomass pellet fuel of the bottom wall in the storage tank is more favorable to preferential pyrolysis and gasification.

According to the technical scheme, the middle part corresponding to the height direction of the combustion chamber is internally provided with the annular groove-shaped clamping wall in an inward protruding mode, the clamping wall and the side wall of the furnace body enclose together to form an annular cavity, the secondary air inlet is communicated with the annular cavity, air outlet holes communicated with the annular cavity are formed in the annular wall at intervals in the circumferential direction, and the discharge end of the feeding auger penetrates through the annular cavity and enters the middle position of the inner ring of the clamping wall.

The beneficial effects of the technical scheme are that: the structure is simple, so that the air introduced by the secondary air inlet can be fully mixed with the combustible gas and burnt vigorously in the area above the clamping wall in the combustion chamber, the air introduced into the combustion chamber by the second air inlet hole enables the combustible gas to burn and open fire to appear in the area below the clamping wall in the combustion chamber, the combustible gas burns more fully, and the secondary air in the annular cavity can cool the discharge port of the feeding auger, so that the biomass granular fuel in the feeding auger is prevented from burning.

According to the technical scheme, the dome for plugging the upper end of the furnace body is further arranged at the upper end of the furnace body, and a fire outlet is formed in the position, close to the dome, of the upper end of the side wall of the furnace body.

The beneficial effects of the technical scheme are that: the flame generated by primary combustion and CO which is not fully combusted are fully fused with oxygen after sufficient secondary air distribution, so that the flame can be effectively gathered and guided, the CO is completely combusted, zero emission is realized, and the combustion is more complete.

Drawings

FIG. 1 is an elevation view of a split air inlet grate in accordance with embodiment 1 of the present utility model;

FIG. 2 is an elevation view of the split air inlet grate of embodiment 1 of the present utility model;

FIG. 3 is a side view of the hitch member of embodiment 1 of the present utility model;

FIG. 4 is an elevation view of the hitch member of embodiment 1 of the present utility model;

FIG. 5 is a bottom view of the distribution of the plurality of the hanging pieces around the inner wall of the furnace body in embodiment 1 of the present utility model;

FIG. 6 is an inside elevational view of the hitch member of embodiment 1 of the present utility model;

FIG. 7 is a bottom view showing the distribution of a plurality of the hanging members around the inner wall of the furnace body in embodiment 1 of the present utility model;

FIG. 8 is a schematic view of two grate plates of the split air intake grate of embodiment 1 of the present utility model;

FIG. 9 is a cross-sectional view of a low nitrogen combustor according to example 2 of the present utility model;

FIG. 10 is a schematic view of the distribution of carbon fire in a fire grate according to example 2 of the present utility model;

fig. 11 is a cross-sectional view of a low nitrogen combustion apparatus according to example 3 of the present utility model.

In the figure: 1 assembled air intake fire grate, 11 comb plate, 12 hanging parts, 121 vertical rods, 122 bottom rods, 123 rod heads, 1231 gaps, 1232 grooves, 13 ventilation holes, 14 first air inlets, 15 second air inlets, 2 furnace bodies, 21 hanging rings, 22 combustion chambers, 22a primary combustion chambers, 22b secondary combustion chambers, 23 ash removal chambers, 231 ash removal openings, 232 ash removal doors, 24 primary air inlets, 25 secondary air inlets, 26 air quantity regulating valves, 27 double-wall, 271 air outlet holes, 28 dome, 29 fire outlets, 3 fans, 4 feeding augers and 5 carbon fire piles.

Detailed Description

The principles and features of the present utility model are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the utility model.

Example 1

As shown in fig. 1 and 2, this embodiment provides a split-type air intake grate, including a grate plate 11 and a plurality of hanging pieces 12, where the hanging pieces 12 are vertically disposed and distributed along a circumferential direction, a hanging portion is disposed on a side of the upper end of each hanging piece 12, which is far away from each other, a supporting portion is disposed on a side of the lower end of each hanging piece 12, which is close to each other, the grate plate 11 is horizontally disposed between the hanging pieces 12 and supported on the supporting portions of the hanging pieces 12 to form a tank, the tank is used for containing biomass granular fuel, the hanging portions at the upper ends of the hanging pieces 12 are used for hanging on the inner wall of the furnace body 2, a first air inlet hole 14 penetrating through the side wall of the tank is disposed on the hanging piece 12 or on two adjacent hanging pieces 12, the upper end of the hanging piece 12 or the second air inlet 15 penetrating from top to bottom is arranged between the upper ends of two adjacent hanging pieces 12, a plurality of hanging pieces are hung on the furnace wall of the furnace body in a ring shape, the grate plate is horizontally supported between the hanging pieces, at the moment, the grate plate and the hanging pieces jointly encircle to form a groove-shaped structure, the assembly is convenient, the local replacement and maintenance can be carried out when the parts are damaged, as the grate plate is fully distributed with ash falling holes penetrating from top to bottom (ash produced after the biomass particle fuel above the grate plate is combusted drops downwards, as the biomass particle fuel is stacked above the grate plate, air below the grate plate does not flow upwards through the ash falling holes), and the air below the assembled air inlet grate can mainly enter the accommodating tank through the area between the hanging pieces and the inner wall of the furnace body and finally enters the accommodating tank through the first air inlet for pyrolysis gasification of the biomass particle fuel, the rest part can enter the upper part of the accommodating tank through the second air inlet hole, wherein biomass granular fuel at the bottom in the accommodating tank is pyrolyzed and gasified into combustible gas, and the combustible gas overflows upwards from the upper part of the accommodating tank and is mixed with air above the accommodating tank to be subjected to intense combustion to form open flame.

In addition, the fire grate is characterized in that air is fed from the side, thereby reducing the conversion rate of N element in the biomass pellet fuel from the root and finally realizing NO reduction _x The emission of the biomass pellet fuel can be reduced, dust emission (the primary air does not enter from the lower part of the biomass pellet fuel, and therefore the biomass pellet fuel cannot be blown upwards to generate dust emission), the emission of particulate matters in the emission pollutants is reduced, and coking can be effectively prevented or reduced.

Wherein, the assembled air inlet grate can be integrally formed into a round groove body or a rectangular groove body after being assembled, and the concrete form of the assembled air inlet grate is determined according to the section of the furnace body.

As shown in fig. 3 and 4, in the above technical solution, the hanging member 12 includes a vertical rod 121, a bottom rod 122 and a rod head 123, the vertical rod 121 is vertically disposed, the bottom rod 122 is horizontally disposed along an inner-outer direction, the lower end of the vertical rod 121 is vertically connected with the middle of the upper end of the bottom rod 122, the inner end of the bottom rod 122 forms a supporting portion of the hanging member 12, the outer end of the bottom rod 122 forms an abutting portion of the hanging member 12, which is used to abut against the inner wall of the furnace body 2, the upper end of the vertical rod 121 is connected with the inner lower end of the rod head 123, a notch 1231 transversely penetrating through is concavely disposed at the outer lower end of the rod head 123, and the notch 1231 forms a hanging portion of the hanging member 12.

In the above technical solution, the upper end of the club head 123 is an inclined surface inclined from inside to outside, so as to avoid depositing biomass pellet fuel at the upper end of the club head.

In the above technical solution, the inner upper end of the bottom rod 122 is an inclined surface inclined from outside to inside and downward, and the edge of the grate plate 11 is supported at the inner upper end of the bottom rod 122, so that the edge of the grate plate is supported at the inner upper end of the bottom rod, thereby extruding the bottom rod outwards, and the abutting part is more firmly abutted with the inner wall of the furnace body.

As shown in fig. 5 and 7, in the above technical solution, two adjacent club heads 123 extend to close to each other, two adjacent club heads 122 have a through gap at two adjacent club heads at two adjacent ends to close to each other to form a vent hole 13 with the inner wall of the furnace body 2, two adjacent club heads 121 have a gap therebetween to form the first air inlet hole 14, so that an annular cavity is formed between a plurality of upright posts and the inner wall of the furnace body, and the vent holes at the inner ends of two adjacent club heads enable air below the assembled air intake grate to enter the annular cavity through the vent holes, and air in the annular cavity can enter the accommodating pool through the first air inlet hole, and the two adjacent upright posts are arranged with the gap therebetween to form the first air inlet hole in a surrounding manner, so that the assembly is more convenient.

In the above technical solution, two sides of each club head 123 are respectively concavely provided with a vertically penetrating groove 1232, and the lower ends of the grooves 1232 are located at the outer sides of the corresponding vertical rods 121, and the grooves 1232 on one side of each adjacent club head 123 are enclosed together to form the second air inlet holes 15, so that the grooves on one side of each adjacent club head are enclosed together to enclose the second air inlet holes, and air in the annular cavity can enter the upper part of the assembled air inlet fire grate through the second air inlet holes.

As shown in fig. 8, the grate plate in this embodiment may be provided with a plurality of grate plates, and the plurality of grate plates are uniformly distributed and arranged in the plurality of hanging members and supported at the plurality of supporting portions, so that the plurality of grate plates are used to seal the lower ends of the tubular members formed by enclosing the plurality of hanging members to form a trough together.

In this embodiment, the inner end and the outer end are referred to a ring structure formed by enclosing a plurality of the hanging members, the inner side of the ring is the inner end, and the outer side of the ring is the outer end, see the solid arrows in fig. 7.

In this embodiment, the widths of the club heads and the inner ends of the bottom rods are larger than the width of the vertical rods, the two sides of the club heads on two sides and the two sides of the inner ends of the bottom rods protrude from the two sides of the vertical rods, and the grooves are formed in the middle of the protruding positions of the two sides of the club heads, so that when the two adjacent club heads and the two adjacent inner ends of the bottom rods are propped against each other, the first air inlet hole and the second air inlet hole can be formed in a surrounding mode.

The dashed arrows in fig. 7 represent the flow diagram of the primary air.

Example 2

As shown in fig. 9, this embodiment provides a low nitrogen burner, including furnace body 2 and pin-connected panel air inlet grate 1 according to embodiment 1, middle part department in furnace body 2 annular is protruding to be equipped with the link 21 that the level set up, pin-connected panel air inlet grate 1 is arranged in the furnace body 2, and through a plurality of the articulated portion of articulated piece 12 articulates on the link 21, pin-connected panel air inlet grate 1 will furnace body 2 inside is cut apart and is being located combustion chamber 22 and the ash removal chamber 23 that is located the below that are located the top, have on the lateral wall of furnace body 2 with ash removal opening 231 that ash removal chamber 23 link up, ash removal opening 231 department is provided with ash removal door 232, have on the lateral wall of furnace body 2 with ash removal chamber 23 intercommunication's primary air inlet 24 and with the secondary air inlet 25 that combustion chamber 22 communicates, primary air inlet 24 and secondary air inlet 25 department all are used for with fan 3's air outlet intercommunication, and the punishment do not are provided with air regulation valve 26 at the intercommunication, and its simple structure, and this internal use of furnace body is made to become the combustion chamber and can further make the fuel and be convenient for the combustion chamber and the combustion chamber is easy to be the air to be the combustion chamber and the air inlet is more convenient to maintain.

The above-mentioned technical scheme still includes feeding auger 4, the discharge gate of feeding auger 4 penetrates to in the furnace body 2 and be located the interior middle part of combustion chamber 22, feeding auger 4 be used for to send into biomass pellet fuel in the combustion chamber 22, its simple structure makes biomass pellet fuel send into in holding the pond is piled up with the toper to more be favorable to holding the preferential pyrolysis gasification of biomass pellet fuel of bottom wall in the pond (wherein, feeding auger's structure belongs to prior art, and is not repeated here).

According to the technical scheme, the middle part corresponding to the height direction of the combustion chamber 22 is internally provided with the annular groove-shaped clamping wall 27 in an inward protruding mode, the clamping wall 27 and the side wall of the furnace body 2 are jointly enclosed to form an annular cavity, the secondary air inlet 25 is communicated with the annular cavity, air outlet 271 communicated with the annular cavity are formed in the annular wall 27 at intervals in an annular direction, the discharge end of the feeding auger 4 penetrates through the annular cavity and enters the middle part of the inner ring of the clamping wall 27, the structure is simple, air introduced by the secondary air inlet can be fully mixed with combustible gas in the area above the clamping wall in the combustion chamber and can be burnt vigorously, and air introduced into the combustion chamber by the second air inlet enables the combustible gas to be burnt in the area below the clamping wall in the combustion chamber and to form open flame, so that the combustible gas is burnt more fully, and the secondary air in the annular cavity can cool the discharge port of the feeding auger, so that biomass particle fuel in the feeding auger is prevented from being burnt.

The combustion chamber in this embodiment may be divided into a primary combustion chamber and a secondary combustion chamber, where the area below the wall of the combustion chamber is the primary combustion chamber, and the area above the wall of the combustion chamber is the secondary combustion chamber, where the second air inlet is to introduce primary air into the primary combustion chamber, and at this time, the combustible gas is ignited in the primary combustion chamber and generates an open flame, and after entering the secondary combustion chamber, the unburned combustible gas is more fully mixed with the secondary air and burns vigorously.

As shown in fig. 10, in this embodiment, a feeding auger (the rotation speed of a driving motor of which is adjustable) is disposed between a primary combustion chamber and a secondary combustion chamber, biomass pellet fuel is fed into the central position of a furnace, during combustion, the biomass pellet fuel gradually forms a cone-shaped carbon fire pile 5 (substantially formed by stacking carbonized biomass pellet fuel) in a fire grate, the feeding auger can be manually controlled to adjust the feeding speed of the biomass pellet fuel according to the heat requirement, so that the biomass pellet fuel uniformly falls to the top end of the carbon fire pile and diffuses downwards and outwards along a taper slope, namely, the newly-supplemented biomass pellet fuel is on the conical surface of the carbon fire pile, the newly-supplemented biomass pellet fuel is gradually combusted from bottom to top, namely, the newly-supplemented biomass pellet fuel is pyrolyzed and gasified on the conical surface of the carbon fire pile, and is carbonized to the upper surface of the carbon fire pile, and the combustible gas overflows upwards, the primary air enters the primary combustion chamber from the periphery of the fire grate through the second air inlet hole, so that suspension-shaped open fire is formed above the conical carbon fire pile [ combustible gas generated by pyrolysis and gasification of biomass particle fuel is fully fused with the primary air and burnt in the primary combustion chamber, and is suspended and burnt at a position 20-30mm away from the surface of the fixed carbon fire pile, the contact area of the combustible gas and the primary air is greatly increased due to the conical surface of the carbon fire pile, so that the combustible gas can be fully burnt in the primary combustion chamber, and the low-nitrogen combustion device is used for introducing sufficient secondary air into the secondary combustion chamber through the secondary air inlet, so that the combustible gas can be fully burnt further in the secondary combustion chamber and is fully converted into heat (particularly CO in the combustible gas is fully burnt), the zero emission of CO can be realized, so that the method is safer and more environment-friendly). The dashed arrow in fig. 10 is similar to the dashed arrow in fig. 7, and indicates a schematic flow diagram of primary air, that is, primary air introduced by the first air inlet flows along the conical surface of the carbon fire pile into the primary combustion chamber, so that the new-substance particulate fuel on the conical surface of the carbon fire pile is pyrolyzed and gasified in the process.

The primary air and the secondary air of the low-nitrogen combustion device are provided by a fan (an air inlet of the fan can be provided with an air inlet air quantity regulating valve (which can be an air inlet flow rate regulating baffle plate which belongs to the prior art and is not described in detail herein and is used for regulating the total air inlet flow rate of the air inlet of the fan), an air outlet of the fan is respectively communicated with the primary air inlet and the secondary air inlet, and air quantity regulating valves are respectively arranged at the communicated positions, so that the flow ratio of the primary air to the secondary air can be regulated (the distribution principle of the primary air and the secondary air is that the primary air quantity is small but not large, and the secondary air quantity is small but not too large or small). The primary air of the low-nitrogen combustion device provided by the embodiment can enter a fire grate from the first air inlet hole at the edge of the fire grate and can be the mostThe pyrolysis gasification of biomass granular fuel on the surface of the carbon fire pile is realized to a large extent, the generated combustible gas has NO great influence on the temperature of the upper surface of the carbon fire pile when in suspension combustion in the primary combustion chamber, and the relatively small primary air inlet flow rate can also lead the carbon fire pile to carry out pyrolysis in a relatively mild state, thus leading the inside of the carbon fire pile to keep relatively low pyrolysis temperature, and the relatively low pyrolysis temperature can greatly reduce the conversion rate of N element in the biomass granular fuel so as to radically reduce NO _x And simultaneously can effectively prevent or reduce the coking phenomenon in the fire grate.

Example 3

As shown in FIG. 11, the difference with embodiment 1 is that in the above technical scheme, the upper end of the furnace body 2 is further provided with a dome 28 for sealing the upper end of the furnace body 2, the upper end of the side wall of the furnace body 2 is provided with a fire outlet 29 near the dome 28, so that flames can be effectively gathered and guided, flames generated by primary combustion and insufficiently combusted CO are fully fused with oxygen after sufficient secondary air distribution, and the zero emission of CO is realized, and meanwhile, the combustion is more sufficient.

The dashed arrows in fig. 11 indicate the flow direction of the flame.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims (10)

1. The utility model provides an assembled air inlet grate, its characterized in that includes comb board (11) and a plurality of articulated elements (12), a plurality of articulated elements (12) all vertical setting to along the hoop distribution, every articulated element (12) upper end one side that keeps away from each other is provided with the articulated element, every articulated element (12) lower extreme one side that is close to each other has the portion of holding up, comb board (11) level sets up a plurality of articulated element (12) between to hold up at the portion of holding up of a plurality of articulated element (12) with the holding up pond of jointly enclosing into the cell body shape, be used for holding in the holding pond and hold living beings pellet fuel, a plurality of articulated element (12) upper end's articulated element is used for the articulated on the inner wall of furnace body (2), on articulated element (12) or two adjacent articulated element (12) are last have link up hold pond lateral wall first inlet port (14), the upper end of articulated element (12) or two adjacent articulated element (12) have and run through between (12) upper end (15).

2. The split type air intake grate of claim 1, wherein the hanging member (12) comprises a vertical rod (121), a bottom rod (122) and a rod head (123), the vertical rod (121) is vertically arranged, the bottom rod (122) is horizontally arranged along the inner and outer directions, the lower end of the vertical rod (121) is vertically connected with the middle part of the upper end of the bottom rod (122), the inner end of the bottom rod (122) forms a supporting part of the hanging member (12), the outer end of the bottom rod (122) forms an abutting part of the hanging member (12) and is used for abutting against the inner wall of the furnace body (2), the upper end of the vertical rod (121) is connected with the inner lower end of the rod head (123), a notch (1231) transversely penetrating through is concavely arranged at the outer lower end of the rod head (123), and the notch (1231) forms the hanging part of the hanging member (12).

3. The split air inlet grate of claim 2, wherein the upper end of the head (123) is an inclined surface inclined from inside to outside.

4. The split air inlet grate of claim 2, wherein the bottom rod (122) has an inclined surface inclined from the outside to the inside at the upper end, and the edge of the grate plate (11) is supported at the upper end of the bottom rod (122).

5. The split type air intake grate of any one of claims 2 to 4, wherein the adjacent two of the club heads (123) extend to be mutually adjacent to one another, the adjacent two of the bottom rods (122) have a gap penetrating up and down at the adjacent two of the outer ends thereof to form an air hole (13) with the inner wall of the furnace body (2), and the adjacent two of the vertical rods (121) have a gap therebetween to form the first air intake hole (14).

6. The split mounting type air intake grate of claim 5, wherein two sides of each of the club heads (123) are respectively provided with a vertically penetrating groove (1232), the lower ends of the grooves (1232) are positioned at the outer sides of the corresponding upright rods (121), and the grooves (1232) on the adjacent two club heads (123) close to each other form the second air intake hole (15) in a surrounding manner.

7. The utility model provides a low nitrogen burner, its characterized in that, including furnace body (2) and in any one of claims 1-5 pin-connected panel air inlet grate (1), middle part department in furnace body (2) annular is protruding to be equipped with link (21) that the level set up, pin-connected panel air inlet grate (1) are arranged in furnace body (2) to through a plurality of the articulated portion of articulated piece (12) articulates on link (21), pin-connected panel air inlet grate (1) will furnace body (2) inside is cut apart and is being located combustion chamber (22) of top and ash removal room (23) that are located the below, have on the lateral wall of furnace body (2) with ash removal mouth (231) that ash removal room (23) link up, ash removal mouth (231) department is provided with ash removal door (232), have on the lateral wall of furnace body (2) with primary air inlet (24) and with secondary air inlet (25) that combustion chamber (22) communicate, primary air inlet (24) and secondary air inlet (25) and air inlet (25) that are used for both communicating with punishment air outlet (26) and are located and do not communicate with each other and are located air outlet (3).

8. The low nitrogen combustion device according to claim 7, further comprising a feeding auger (4), wherein a discharge port of the feeding auger (4) penetrates into the furnace body (2) and is located at the inner middle part of the combustion chamber (22), and the feeding auger (4) is used for feeding biomass granular fuel into the combustion chamber (22).

9. The low-nitrogen combustion device according to claim 8, wherein a middle part corresponding to the height direction of the combustion chamber (22) is provided with a clamping wall (27) with a ring groove shape in an inward protruding mode, the clamping wall (27) and the side wall of the furnace body (2) are enclosed together to form a ring cavity, the secondary air inlet (25) is communicated with the inside of the ring cavity, air outlet holes (271) communicated with the inside of the ring cavity are formed in the annular space at the clamping wall (27) in a circumferential direction, and the discharge end of the feeding auger (4) penetrates through the ring cavity and enters the middle position of the inner ring of the clamping wall (27).

10. The low-nitrogen combustion device according to claim 9, wherein a dome (28) for plugging the upper end of the furnace body (2) is further arranged at the upper end of the furnace body (2), and a fire outlet (29) is arranged at the upper end of the side wall of the furnace body (2) close to the dome (28).