CN115585458B - High-speed preheating premixing combustion device - Google Patents

Abstract

The invention discloses a high-speed preheating premixing combustion device, and belongs to the field of combustors. In the burner, the mixing chamber is positioned in front of the primary air chamber and communicated with the gas chamber; the outer peripheral surface of the burner is provided with an air outlet communicated with the primary air cavity and an air inlet communicated with the mixing cavity, and the front end surface of the burner is provided with an air outlet communicated with the secondary air cavity and a premixing outlet communicated with the mixing cavity; the rear end of the outer sleeve is sleeved at the front end of the burner; the inner sleeve is arranged between the outer sleeve and the burner, the front end of the inner sleeve penetrates through the front end face of the outer sleeve, the inner sleeve is provided with a cavity and a flame outlet communicated with the cavity, and the peripheral wall surface of the inner sleeve is provided with a preheating inlet and a preheating outlet which are communicated with the cavity; a first flow passage and a second flow passage which extend back and forth are formed between the inner sleeve and the outer sleeve, and the air outlet, the preheating inlet, the first flow passage, the second flow passage, the preheating outlet and the air inlet are communicated in sequence. The invention can greatly improve the temperature of combustion air, has good energy-saving effect and has small influence on the working condition of the kiln.

Description

High-speed preheating premixing combustion device

Technical Field

The invention relates to the technical field of combustors, in particular to a high-speed preheating premixing combustion device.

Background

At present, self-preheating type burners are widely used in the technical field of industrial kilns. The tail gas of the kiln is used as combustion-supporting air, is introduced into the burner and is mixed with the fuel gas, so that the heat of the combustion-supporting air is transferred to the fuel gas, but the temperature of the combustion-supporting air is only about 200 ℃, the combustion-supporting temperature is insufficient, and the energy-saving effect is poor. Some burners preheat combustion air through increasing independent heat exchanger, promote combustion air's temperature, however, overall structure is complicated, and is bulky, installs inconveniently.

In addition, for example, in the high-power heat exchange type burner for the industrial kiln disclosed in the patent with the application number of CN201410313730.7, the high-temperature flue gas in the flue and the combustion-supporting air repeatedly flow in the reverse direction to exchange heat, so that the combustion-supporting temperature is obviously increased, and the energy-saving effect is improved. However, the burners are generally installed on the side wall of the kiln fired with ceramic, the temperature of the flue gas in the kiln is very high, up to 1200 ℃, the temperature of the flue gas after heat exchange is still high, and the requirement of emission cannot be met.

Therefore, the burner structure cannot meet the requirements of the existing ceramic kiln.

Disclosure of Invention

The invention aims to provide a high-speed preheating premixing combustion device which is simple and unique in structure, convenient to install, capable of greatly improving the temperature of combustion air, good in energy-saving effect and small in influence on the working condition of a kiln.

The technical scheme adopted for solving the technical problems is as follows:

the invention provides a high-speed preheating premixed combustion device, comprising:

the burner is provided with a primary air cavity, a secondary air cavity, a gas cavity and a mixing cavity, and the mixing cavity is positioned in front of the primary air cavity and communicated with the gas cavity; the peripheral wall surface of the burner is provided with an air outlet communicated with the primary air chamber and an air inlet communicated with the mixing chamber, and the front end surface of the burner is provided with an air outlet communicated with the secondary air chamber and a premixing outlet communicated with the mixing chamber;

the outer sleeve is provided with a cavity, and the rear end of the outer sleeve is sleeved at the front end of the burner;

the inner sleeve is arranged between the outer sleeve and the burner, the front end of the inner sleeve penetrates through the front end face of the outer sleeve, the inner sleeve is provided with a cavity and a flame outlet communicated with the cavity, and the peripheral wall surface of the inner sleeve is provided with a preheating inlet and a preheating outlet which are communicated with the cavity; and a first flow passage and a second flow passage which extend along the front and the back are formed between the inner sleeve and the outer sleeve, and the air outlet, the preheating inlet, the first flow passage, the second flow passage, the preheating outlet and the air inlet are communicated in sequence.

The invention has at least the following beneficial effects: the high-speed preheating premixing combustion device adopts a two-stage combustion-supporting mode, primary combustion-supporting air in a primary air chamber flows to a first flow passage through an air outlet and a preheating inlet, the first flow passage and a second flow passage extend along the front and back and are positioned between an inner sleeve and an outer sleeve, the primary combustion-supporting air can greatly absorb heat of the inner sleeve and the outer sleeve in the process of flowing through the first flow passage and the second flow passage, becomes high-temperature combustion-supporting air and flows to a mixing chamber through a preheating outlet and an air inlet, and meanwhile, gas in the gas chamber flows to the mixing chamber and is mixed with the high-temperature combustion-supporting air to form preheated mixed gas; the mixed gas that flows from premixing export can the fast combustion after the ignition, forms stable flame, and simultaneously, the secondary combustion air in the secondary air chamber flows out the air outlet, for flame supplement more oxygen, lets the gas can the abundant burning for flame spreads outside the flame export.

Because flame burns in the cavity of inner sleeve, and the outer sleeve is installed on the kiln wall of high temperature, consequently, the temperature of inner sleeve and outer sleeve is very high, and the one-level combustion air can absorb a large amount of heat energy that come from inner sleeve and outer sleeve, improves the temperature of self greatly, can greatly promote the temperature of gas in the mixing process, reaches the good purpose of energy-conserving effect to, it is very little to the operating mode influence of kiln.

As a further improvement of the above technical solution, the burner includes a plurality of gas conduits and a premixing conduit, the gas conduits are provided with a plurality of conduits, the rear ends of the conduits are communicated with the gas chamber, the premixing conduits are provided with a plurality of conduits, the rear ends of the conduits are communicated with the mixing chamber, each gas conduit is partially inserted into each premixing conduit, and the premixing outlet is provided at the front end of the premixing conduit. So set up, let the gas lead in respectively to a plurality of gas pipes in premixing the pipe for the gas mixes more evenly with the combustion-supporting wind of high temperature in premixing the pipe.

As a further improvement of the above technical scheme, the burner further comprises a sleeve, a first air disc and a second air disc, the sleeve is provided with an inner cavity, the air outlet and the air inlet are arranged on the peripheral wall surface of the sleeve, the premixed pipes are arranged at intervals, the front ends of the premixed pipes are penetrated through the second air disc, the rear ends of the premixed pipes are penetrated through the first air disc, the first air disc is provided with air through holes penetrating through the front and the rear, the second air disc is provided with swirl slots penetrating through the front and the rear, the swirl slots are communicated with the air through holes, and the first air disc and the second air disc are positioned on the front side of the air inlet and are respectively connected with the peripheral surface of the sleeve.

So set up, make many pipes in advance fix at telescopic inner chamber through first wind dish and second wind dish, moreover, first wind dish sets up the air through hole, many mix the clearance in advance between the pipe, the second wind dish sets up the whirl groove, make the combustion-supporting wind of partial high temperature through the air through hole, clearance and whirl groove flow, and with the gas mixture after preheating mutually mixed, the combustion-supporting wind of high temperature that flows from the whirl groove plays the stirring effect, make combustion-supporting wind of high temperature and gas mixture form more even gas mixture, thereby make the gas can the fast and stable burning.

As a further improvement of the above technical scheme, the burner further comprises a secondary air pipeline; run through first wind dish and second wind dish around the second grade air conduit, the second grade air conduit has the second grade air cavity, the front end of second grade air conduit is equipped with the air outlet, the rear end of second grade air conduit is equipped with second grade air intlet, many it is the circumference setting to encircle the air outlet to mix the pipe in advance.

So set up, secondary combustion air flows out the air outlet through secondary air chamber toward the front to mix with the gas mixture after preheating that flows from the multiple pipe in advance, many pipe in advance encircle the air outlet setting, can increase gas mixture and secondary combustion air's area of contact, thereby make the gas can burn more completely.

As a further improvement of the above technical solution, the secondary air duct is provided with an air passage extending forward and backward, the air passage extends backward between the first air plate and the second air plate and is communicated with the air through hole; the air passage is provided in plurality and arranged circumferentially around the air outlet.

So design, make some in the high temperature combustion-supporting wind that is arranged in between first wind dish and the second wind dish flow through the whirl groove, another part flows through air passage, because a plurality of air passage encircle the setting of air outlet circumference, consequently, the high temperature combustion-supporting wind that flows from air passage is located between the mixture after second grade combustion-supporting air and the preheating, can let high temperature combustion-supporting wind further mix with the mixture after the preheating again, make gas and one-level combustion-supporting air mix ground more evenly.

As a further improvement of the above technical solution, the burner further comprises a gas pipeline and a casing; the shell is positioned between the air inlet and the air outlet and is connected with the inner circumferential surface of the sleeve, the rear end of the gas conduit penetrates through the shell, and the front end of the gas pipeline penetrates through the shell.

Because the internal volume of casing is bigger than the gas pipeline, after the gas that flows at a high speed in the gas pipeline flows into the casing, self speed reduces, and the gas in the casing distributes through many gas pipes to flow to and mix the pipe in advance, so set up, can make the quantity increase of gas pipe, reduce the speed of gas, make the gas can be longer with the combustion-supporting wind mix time of high temperature, more even.

As a further improvement of the technical scheme, the front end of the secondary air pipeline sequentially penetrates through the gas pipeline, the shell, the first air disc and the second air disc and is coaxially arranged; and a gap is formed between the gas pipeline and the secondary air pipeline. The second-stage air pipeline, the gas pipeline, the shell, the first air disc and the second air disc are coaxially arranged, so that the structure of the burner is more compact, and the gas flowing in the gas pipeline and the second-stage combustion air flowing in the second-stage air pipeline are mutually independent and do not influence each other.

As a further improvement of the above technical solution, a partition plate extending forward and backward is provided on an outer circumferential wall surface of the inner sleeve, the partition plate is connected to an inner circumferential surface of the outer sleeve, the partition plate is provided between the preheating inlet and the preheating outlet, and a front end of the first flow passage is communicated with a front end of the second flow passage. The first flow channel and the second flow channel which are positioned between the inner sleeve and the outer sleeve are separated through the partition plate, so that the primary combustion air can sequentially flow through the first flow channel and the second flow channel.

As a further improvement of the technical scheme, the preheating inlet and the preheating outlet are respectively provided with two preheating inlets and are symmetrically arranged relative to the central axis of the inner sleeve. So set up, can increase the quantity of first runner and second runner, make one-level combustion air can contact with the outer peripheral face of inner skleeve, the inner peripheral surface of outer sleeve to increase heat transfer area makes one-level combustion air's temperature obtain improving by a wide margin.

As a further improvement of the technical scheme, the high-speed preheating premixing combustion device also comprises a sealing plate; the sealing plate is positioned on the front side of the outer sleeve and arranged between the inner sleeve and the outer sleeve, and the sealing plate is positioned in front of the partition plate.

So set up, make the shrouding can contact with the outer peripheral face of inner skleeve and the inner peripheral face of outer sleeve respectively to the front end opening to outer sleeve carries out sealing process, avoids the front end opening outflow of one-level combustion air from the outer sleeve, and in addition, the shrouding is located the place ahead of baffle, makes one-level combustion air flow to the shrouding and when the region between the baffle along first runner, can take place the runner direction and change, and then flow to the second runner in.

Drawings

The invention is further described with reference to the accompanying drawings and examples;

FIG. 1 is a perspective view of a high-speed pre-heating premixed combustion apparatus according to an embodiment of the present invention;

FIG. 2 is an assembled schematic view of a high-speed pre-heating premixed combustion apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a burner provided in an embodiment of the present invention;

FIG. 4 is a schematic structural view of a burner core provided by an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a high-velocity pre-heated premixed combustion apparatus provided by an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of the internal structure of a burner provided in an embodiment of the present invention.

The drawings are numbered as follows: 100. burning a nozzle; 101. a gas inlet; 102. a primary air inlet; 103. a secondary air inlet; 104. an air outlet; 105. an air inlet; 106. an inner cavity; 110. a housing; 111. a primary air chamber; 112. a sleeve; 120. a secondary air duct; 121. a secondary air chamber; 130. a gas pipeline; 131. a gas chamber; 140. a housing; 141. a buffer chamber; 150. a gas conduit; 160. a first wind plate; 161. an air through hole; 170. a premix conduit; 171. a lumen; 180. a second wind plate; 181. a swirling flow groove; 182. air holes; 190. a spray head; 191. an air outlet; 192. an air passage; 200. an inner sleeve; 201. preheating an inlet; 202. a preheating outlet; 203. a partition plate; 204. a flame outlet; 205. a cavity; 300. an outer sleeve; 301. the front end is open; 302. a cavity; 400. and (7) closing the plate.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if words such as "a", "an", etc. are used, they mean one or more, plural means two or more, greater than, less than, more than, etc. are understood as excluding the number, and greater than, less than, etc. are understood as including the number. If any description to first, second and third is only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

It should be noted that, in the drawing, the X direction is from the rear side of the high-speed preheating premixing combustion device to the front side; the Y direction is from the left side of the high-speed preheating premixing combustion device to the right side; the Z direction is from the lower side of the high-speed preheating premixing combustion device to the upper side. The dashed line in fig. 2 represents the assembly path of the high-speed pre-heating premix burner.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 6, several embodiments of the high-speed preheating premixed combustion apparatus of the present invention will be described.

As shown in fig. 1 to 6, an embodiment of the present invention provides a high-speed preheating premixed combustion apparatus, which has the advantages of simple and unique structure, simple and convenient installation, and small volume, can greatly increase the temperature of combustion air, and achieves the purpose of good energy saving effect, and when the high-speed preheating premixed combustion apparatus is installed in a kiln and operates, the high-speed preheating premixed combustion apparatus has very little influence on the working conditions of the kiln.

Specifically, the structure of the high-speed preheating premixing combustion device comprises a burner 100, an inner sleeve 200, a closing plate 400 and an outer sleeve 300.

The burner 100 has a primary air chamber 111, a secondary air chamber 121, a gas chamber 131, and a mixing chamber. The primary air chamber 111 is used for flowing primary combustion air, the secondary air chamber 121 is used for flowing secondary combustion air, and the gas chamber 131 is used for flowing gas, such as natural gas, water gas, hydrogen, and the like, which is not limited herein. The mixing chamber provides a mixing space for the primary combustion air and the fuel gas.

The mixing chamber is located in front of the primary air chamber 111, and the mixing chamber communicates with the gas chamber 131. The gas chamber 131 is located between the primary air chamber 111 and the mixing chamber.

The burner 100 is provided with an air inlet 105 and an air outlet 104, the air inlet 105 and the air outlet 104 are positioned on the outer peripheral wall surface of the burner 100, and the air inlet 105 is positioned in front of the air outlet 104. Wherein the air outlet 104 communicates with the primary air chamber 111. The rear end of the burner 100 is provided with a primary air inlet 102 and a gas inlet 101. The primary air inlet 102 is in communication with the primary air chamber 111 such that primary combustion air flows into the primary air chamber 111 through the primary air inlet 102 and out the air outlet 104. The gas inlet 101 is in communication with the gas chamber 131, allowing gas to flow into the gas chamber 131 through the gas inlet 101. The air inlet 105 is communicated with the mixing chamber, so that the primary combustion air flows into the mixing chamber through the air inlet 105, and meanwhile, the fuel gas flows into the mixing chamber from the fuel gas chamber 131 and is mixed with the primary combustion air to form uniform mixed gas.

The burner 100 is provided with an air outlet 191 and a premixing outlet, the air outlet 191 and the premixing outlet are positioned on the front end face of the burner 100, and the air outlet 191 is communicated with the secondary air chamber 121. The rear end of the burner 100 is provided with a secondary air inlet 103, the secondary air inlet 103 is communicated with a secondary air chamber 121, and secondary combustion air flows into the secondary air chamber 121 through the secondary air inlet 103 and flows out from an air outlet 191. The premixing outlet is communicated with the mixing chamber, and mixed gas in the mixing chamber flows out through the premixing outlet and is mixed with secondary combustion air from the air outlet 191, so that the gas can be completely combusted.

The outer sleeve 300 is hollow to form a cavity 302, the cavity 302 penetrates through the front end face and the rear end face of the outer sleeve 300, the rear end of the outer sleeve 300 is sleeved at the front end of the burner 100, the outer sleeve 300 can be fixed on the burner 100 through bolts, namely, the rear end opening of the outer sleeve 300 is closed by the burner 100, and the front end opening 301 of the outer sleeve 300 is open.

The cavity 205 is formed in the inner sleeve 200 in a hollow mode, the cavity 205 penetrates through the front end face and the rear end face of the inner sleeve 200, the rear end of the inner sleeve 200 is sleeved at the front end of the burner 100, the inner sleeve 200 is located between the outer sleeve 300 and the burner 100, the inner sleeve 200 can be fixed on the burner 100 through bolts, namely the rear end opening of the inner sleeve 200 is closed by the burner 100, the front end opening of the inner sleeve 200 is a flame outlet 204 and is of an open structure, and the flame outlet 204 is communicated with the cavity 205.

The front end of the inner sleeve 200 penetrates the front end surface of the outer sleeve 300. Specifically, the front end of the inner sleeve 200 can pass through the front opening 301 of the outer sleeve 300 and extend forward beyond the front opening 301. The sealing plate 400 is located on the front side of the outer sleeve 300, and the sealing plate 400 is provided between the inner sleeve 200 and the outer sleeve 300 to fill the gap between the inner sleeve 200 and the outer sleeve 300.

In this embodiment, the inner sleeve 200 and the outer sleeve 300 have circular cross-sectional shapes, the sealing plate 400 has an annular shape, and the sealing plate 400 can be connected to the outer circumferential surface of the inner sleeve 200 and the inner circumferential surface of the outer sleeve 300, respectively, so that the front end opening 301 of the outer sleeve 300 is blocked by the sealing plate 400.

The inner sleeve 200 is provided with a preheating inlet 201 and a preheating outlet 202, the preheating inlet 201 and the preheating outlet 202 are located on the outer peripheral wall surface of the inner sleeve 200, the preheating inlet 201 and the preheating outlet 202 are both communicated with the cavity 205, and the preheating inlet 201 is located behind the preheating outlet 202.

A first flow passage and a second flow passage are formed between the inner sleeve 200 and the outer sleeve 300, and both the first flow passage and the second flow passage extend in the front-rear direction. Specifically, a partition 203 is provided between the inner sleeve 200 and the outer sleeve 300, the partition 203 extends in the front-rear direction, the partition 203 is connected to the outer circumferential wall surface of the inner sleeve 200 and the inner circumferential wall surface of the outer sleeve 300, and the partition 203 is provided between the preheating inlet 201 and the preheating outlet 202, so that the number of the partitions 203 is two. Because the inner sleeve 200 and the outer sleeve 300 are coaxially arranged, an annular gap is formed between the inner sleeve 200 and the outer sleeve 300, the two partition plates 203 are arranged in the gap so as to separate a first flow passage and a second flow passage, and the front end of the first flow passage is communicated with the front end of the second flow passage, therefore, primary combustion air can flow to the second flow passage along the first flow passage.

The cover plate 400 is positioned in front of the partition plate 203, and a gap is provided between the rear end of the cover plate 400 and the front end of the partition plate 203, so that the front end of the first flow passage and the front end of the second flow passage communicate with each other.

In the present embodiment, the spacer 203 is provided on the outer circumferential wall surface of the inner barrel 200, the spacer 203 is integrally formed with the inner barrel 200, and after the inner barrel 200 and the outer barrel 300 are attached to the burner 100, the spacer 203 abuts on the inner circumferential wall surface of the outer barrel 300.

It can be understood that the first flow passage and the second flow passage between the inner sleeve 200 and the outer sleeve 300 are separated by the partition plate 203, so that the first-stage combustion air can sequentially flow through the first flow passage and the second flow passage, that is, the first-stage combustion air flows forwards along the peripheral wall surface of the inner sleeve 200 and then flows backwards along the other peripheral wall surface of the inner sleeve 200.

The length of the outer sleeve 300 is determined according to the thickness of the side wall of the furnace. The inner sleeve 200 and the outer sleeve 300 may be silicon carbide sleeves.

In some embodiments, the number of preheat inlets 201 and the number of preheat outlets 202 are both one.

In this embodiment, the preheating inlet 201 and the preheating outlet 202 are provided in two numbers, and the two preheating inlets 201 are symmetrically provided about a central axis extending in the front-rear direction of the inner sleeve 200, and the two preheating outlets 202 are symmetrically provided about a central axis extending in the front-rear direction of the inner sleeve 200. Specifically, the number of the partition plates 203 is four, and the four partition plates 203 are circumferentially arranged around a central axis extending in the front-rear direction of the inner sleeve 200, thereby dividing two first flow passages symmetrically arranged with respect to the inner sleeve 200 and two second flow passages symmetrically arranged with respect to the inner sleeve 200.

It can be understood that, by adopting the above arrangement, the number of the first flow passages and the second flow passages can be increased, so that the primary combustion air can be in contact with the outer circumferential surface of the inner sleeve 200 and the inner circumferential surface of the outer sleeve 300, thereby increasing the heat exchange area and promoting the temperature of the primary combustion air to be greatly increased. The primary combustion air absorbs heat while reducing the temperature of the inner sleeve 200 and the outer sleeve 300.

The air outlet 104, the preheating inlet 201, the first flow passage, the second flow passage, the preheating outlet 202 and the air inlet 105 are sequentially communicated, so that the primary combustion air in the primary air chamber 111 flows to the first flow passage through the air outlet 104 and the preheating inlet 201, and the primary combustion air flows forwards in the first flow passage; the primary combustion air then flows into the second flow passage and back therein and finally into the mixing chamber via the pre-heat outlet 202 and the air inlet 105.

It can be understood that the high-speed preheating premixing combustion device adopts a secondary combustion-supporting combustion mode, namely, primary combustion-supporting air and secondary combustion-supporting air are provided for fuel gas. The primary combustion air in the primary air chamber 111 flows forwards and flows to the first flow channel through the air outlet 104 and the preheating inlet 201 in sequence, the first flow channel and the second flow channel extend forwards and backwards and are located between the inner sleeve 200 and the outer sleeve 300, and the primary combustion air can greatly absorb heat of the inner sleeve 200 and the outer sleeve 300 in the process of passing through the first flow channel and the second flow channel at a high speed to become high-temperature combustion air and flows to the mixing chamber through the preheating outlet 202 and the air inlet 105 in sequence.

Meanwhile, the gas in the gas chamber 131 flows forward to the mixing chamber, and is mixed with high-temperature combustion-supporting air for the first time, that is, premixed, to form preheated mixed gas; the mixed gas flowing out of the premixing outlet can be rapidly combusted after being ignited under the action of the ignition electrode, and stable flame is formed. At this time, the secondary combustion air in the secondary air chamber 121 flows forward and flows out from the air outlet 191 to supplement more oxygen to the flame, so that the gas can be sufficiently combusted, and the flame can spread out of the flame outlet 204.

Because the flame is combusted in the cavity 205 of the inner sleeve 200, the inner sleeve 200 can receive the radiant heat of the flame to cause the temperature to rise, the outer sleeve 300 is installed on the kiln wall with high temperature, the temperature of the outer sleeve 300 is also very high, the primary combustion air can absorb a large amount of heat energy from the inner sleeve 200 and the outer sleeve 300, the temperature of the primary combustion air is greatly improved, the temperature of the fuel gas can be greatly improved in the mixing process, the purpose of good energy-saving effect is achieved, and the influence on the working condition of the kiln is very small. When the primary combustion air passes through the gap between the inner sleeve 200 and the outer sleeve 300 at a high speed, the primary combustion air is heated by the heat emitted by the burner 100, so that the temperature of the primary combustion air can reach 400-500 ℃, and the preheating work of the primary combustion air is well completed.

In some embodiments, the burner 100 is configured to include a gas conduit 150 and a premix conduit 170. The gas conduit 150 and the premix conduit 170 may be round tubes.

The gas guide pipes 150 extend in the front-rear direction, the number of the gas guide pipes 150 is multiple, and the rear ends of all the gas guide pipes 150 are communicated with the gas cavity 131, so that the gas in the gas cavity 131 is distributed through the gas guide pipes 150.

The premixing guide pipes 170 are extended in the front-rear direction, the number of the premixing guide pipes 170 is multiple, and the rear ends of all the premixing guide pipes 170 are communicated with the mixing chamber, so that the preheated primary combustion air flows into the mixing chamber and then flows into the premixing guide pipes 170, and the preheated primary combustion air is distributed through the premixing guide pipes 170.

The premix duct 170 is hollow to form a lumen 171, and the diameter of the lumen 171 is larger than the outer diameter of the gas duct 150. Therefore, a front end portion of each gas guide pipe 150 is inserted into each premix guide pipe 170, and it is understood that the length of the gas guide pipe 150 inserted into the premix guide pipe 170 may be determined according to practical circumstances and is not particularly limited thereto. The forward end of each premix conduit 170 has an opening that is a premix outlet.

The plurality of gas conduits 150 and the plurality of premixing conduits 170 may be coaxially arranged and the plurality of gas conduits 150 may be evenly spaced.

It can be understood that the primary combustion air and the fuel gas are mixed in the mixing chamber with a large space, and the mixing uniformity of the fuel gas and the primary combustion air is general. In this embodiment, a plurality of gas conduits 150 and a plurality of premixing conduits 170 are provided, so that the gas is respectively introduced into the plurality of premixing conduits 170 through the plurality of gas conduits 150, and the gas is more uniformly mixed with the high-temperature combustion air in the premixing conduits 170, thereby improving the mixing uniformity of the gas and the primary combustion air. In addition, the gas duct 150 passes through the mixing chamber and extends forward into the premixing duct 170, and the high-temperature combustion-supporting air entering the mixing chamber blows towards the gas duct 150 vertically, so that the gas in the gas duct 150 can be heated, the preheating of the gas before mixing is completed, the temperature of the gas is increased to the maximum extent, the combustion temperature is increased, and the purposes of energy conservation and consumption reduction are achieved.

In some embodiments, the burner 100 further includes a sleeve 112, a first winddisk 160, and a second winddisk 180.

The sleeve 112 is hollow to form an inner cavity 106, and the front end of the inner cavity 106 is of an open structure. The outlet 104 and the inlet 105 are provided on the outer peripheral wall surface of the sleeve 112. The inner sleeve 200 is fitted over the sleeve 112, and the outer peripheral surface of the sleeve 112 contacts the inner peripheral surface of the inner sleeve 200.

A plurality of premix conduits 170 are spaced apart and arranged circumferentially about the central axis of the sleeve 112. The front end of the premixing guide pipe 170 penetrates through the second air disk 180, the rear end of the premixing guide pipe 170 penetrates through the first air disk 160, and the premixing guide pipe 170 is fixedly connected with the first air disk 160 and the second air disk 180 respectively. Since the premix conduit 170 extends through the first and second winddisks 160, 180, the front and rear openings of the premix conduit 170 are open. For example, the second air plate 180 is provided with a plurality of air holes 182, and the air holes 182 communicate with the front end opening of the premix conduit 170.

The first air disk 160 is provided with a plurality of air through holes 161, the air through holes 161 penetrate through the front end surface and the rear end surface of the first air disk 160, the air through holes 161 are communicated with the mixing chamber, and the number of the air through holes 161 is multiple. In the present embodiment, the air through holes 161 are provided at the outer circumferential surface of the first winddisk 160, and the plurality of air through holes 161 are arranged circumferentially about the central axis of the first winddisk 160. It is understood that the air through holes 161 may be disposed to avoid the premix conduit 170.

The second air disk 180 is provided with a plurality of swirl grooves 181, the swirl grooves 181 penetrate through the front end surface and the rear end surface of the second air disk 180, and the number of the swirl grooves 181 is multiple. In this embodiment, the swirl grooves 181 are disposed on the outer circumferential surface of the second air disk 180, and the plurality of swirl grooves 181 are circumferentially arranged about the central axis of the second air disk 180.

Since the first and second air disks 160 and 180 have a gap therebetween in the front-rear direction and the plurality of premixing conduits 170 are disposed at intervals, the gap between the first and second air disks 160 and 180 cannot be completely filled, and the swirl groove 181 communicates with the gap and the air through hole 161 communicates with the gap, the preheated primary combustion air can sequentially flow through the air through hole 161, the gap and the swirl groove 181.

The first air disk 160 and the second air disk 180 are located at the front side of the air inlet 105, and the inner circumferential surface of the first air disk 160 and the inner circumferential surface of the second air disk 180 are connected with the outer circumferential surface of the sleeve 112.

It can be understood that, with the above arrangement, the plurality of premixing conduits 170 are fixed in the inner cavity 106 of the sleeve 112 through the first air disk 160 and the second air disk 180, and the first air disk 160 is provided with the air through hole 161, gaps are provided between the plurality of premixing conduits 170, and the second air disk 180 is provided with the swirl groove 181, so as to promote a part of high-temperature combustion-supporting air to flow out through the air through hole 161, the gaps between the first air disk 160 and the second air disk 180, and the swirl groove 181, and then the part of high-temperature combustion-supporting air is mixed with the preheated mixture, and the high-temperature combustion-supporting air flowing out from the swirl groove 181 has a strong stirring effect, so that the high-temperature combustion-supporting air and the mixture form a more uniform mixture, thereby promoting the rapid and stable combustion of the fuel gas.

In some embodiments, the burner 100 further includes a secondary air duct 120.

Secondary air duct 120 extends the setting along the fore-and-aft direction, and the inside cavity of secondary air duct 120 is formed with secondary air cavity 121, and secondary air duct 120's front end is equipped with air outlet 191, and secondary air duct 120's rear end is equipped with secondary air inlet 103 for secondary combustion air can flow into secondary air cavity 121 through secondary air inlet 103, and flow out from air outlet 191.

The front end of the secondary air duct 120 sequentially penetrates the first air plate 160 and the second air plate 180. Specifically, the first and second winddisks 160 and 180 are provided with mounting through holes, and the outer circumferential surface of the secondary air duct 120 is connected to the inner circumferential surface of the mounting through holes. The air outlet 191 of the secondary air duct 120 is located at the front side of the second winddisk 180, and the secondary air inlet 103 of the secondary air duct 120 is located at the rear side of the first winddisk 160.

Furthermore, the plurality of premix conduits 170 are circumferentially disposed about the air outlets 191, i.e., the preheated premix gas, upon exiting, surrounds the secondary combustion air exiting the air outlets 191.

It will be appreciated that secondary combustion air flows forwardly out of the air outlet 191 via the secondary air chamber 121 and mixes with the preheated mixture flowing from the plurality of premix conduits 170, and the plurality of premix conduits 170 disposed around the air outlet 191 increase the contact area of the mixture with the secondary combustion air, thereby facilitating more complete combustion of the fuel gas.

Further, the secondary air duct 120 is provided with an air passage 192, the air passage 192 is extended in the front-rear direction, and one end of the air passage 192 is extended backward to between the first wind disk 160 and the second wind disk 180, so that the air passage 192 is communicated with the air through hole 161. The air passage 192 is plural in number, and the plural air passages 192 are arranged circumferentially around the air outlet 191.

It can be understood that, by adopting the above structural design, a part of the high-temperature combustion-supporting air between the first air disk 160 and the second air disk 180 flows out through the swirl grooves 181, the part of the high-temperature combustion-supporting air is positioned at the periphery of the mixed gas, the other part of the high-temperature combustion-supporting air between the first air disk 160 and the second air disk 180 flows out through the air channel 192, the part of the high-temperature combustion-supporting air is positioned at the inner periphery of the mixed gas, and meanwhile, the high-temperature combustion-supporting air flowing out of the air channel 192 is positioned between the secondary combustion-supporting air and the preheated mixed gas, so that the high-temperature combustion-supporting air can be further mixed with the preheated mixed gas again, and the mixed gas and the primary combustion-supporting air are more uniform.

In some embodiments, the burner 100 further comprises a gas conduit 130 and a casing 140.

The housing 140 is positioned between the inlet 105 and the outlet 104, and the outer peripheral surface of the housing 140 is connected to the inner peripheral surface of the sleeve 112, and the sleeve 112 is a stainless steel sleeve having a cylindrical shape, so that the housing 140 has a cylindrical shape so that the sleeve 112 can be fitted over the housing 140.

A buffer cavity 141 is formed in the hollow interior of the shell 140, and the rear end of the gas conduit 150 penetrates through the shell 140, so that the gas conduit 150 is communicated with the buffer cavity 141; the front end of the gas pipe 130 penetrates the casing 140, so that the gas pipe 130 communicates with the buffer chamber 141. After the gas flowing at a high speed in the gas pipeline 130 enters the buffer cavity 141, the gas is slowed down, and then flows out of the buffer cavity 141 through the plurality of gas guide pipes 150, so that the buffer cavity 141 can play a certain role in buffering, and the flow speed of the gas is reduced. Specifically, a plurality of connecting holes are formed in the front end surface of the housing 140, and the rear ends of the plurality of gas conduits 150 correspondingly penetrate through the plurality of connecting holes and are fixedly connected with the housing 140, so that the gas conduits 150 are communicated with the buffer cavity 141; the rear end surface of the housing 140 is provided with a connection through hole, the connection through hole can be located at the middle position of the rear end surface of the housing 140, and the front end of the gas pipeline 130 passes through the connection through hole and is fixedly connected with the housing 140, so that the gas pipeline 130 is communicated with the buffer cavity 141. The diameter of the housing 140 is larger than the diameter of the gas pipe 130.

It can be understood that, since the inner volume of the casing 140 is larger than that of the gas pipe 130, after the gas flowing at a high speed in the gas pipe 130 flows into the buffer chamber 141 of the casing 140, the gas speed thereof is reduced, and the gas in the buffer chamber 141 is distributed through the plurality of gas conduits 150 and flows toward the premixing conduit 170. By the arrangement, the number of the gas guide pipes 150 is increased, the speed of gas is reduced, and the gas can be mixed with high-temperature combustion air for a longer time and more uniformly.

In some embodiments, the front end of the secondary air duct 120 sequentially penetrates the gas duct 130, the casing 140, the first air disk 160, and the second air disk 180, and they are coaxially disposed. A gap exists between the gas duct 130 and the secondary air duct 120 so that the gas in the gas duct 130 can flow into the casing 140 through the gap. Since the secondary air duct 120 penetrates the second air plate 180, the front end of the secondary air duct 120 protrudes forward to form a nozzle 190.

The burner 100 structure also includes a housing 110. The front end of the outer shell 110 and the rear end of the sleeve 112 are fixedly coupled, and the rear end of the inner sleeve 200 and the rear end of the outer sleeve 300 are coupled to the front end of the outer shell 110. A secondary air duct 120 is disposed through the outer shell 110.

After the sleeve 112 and the outer shell 110 are fixedly connected and the shell 140 is installed on the sleeve 112, the sleeve 112 and the outer shell 110 together form a primary air chamber 111, the primary air chamber 111 is located at the rear side of the shell 140, and the primary air chamber 111 is located at the periphery of the gas pipeline 130. The housing 110 is provided with a primary air inlet 102, the primary air inlet 102 being in communication with a primary air chamber 111.

In addition, the housing 110 is provided with a gas inlet 101, and the gas inlet 101 communicates with a gas duct 130 located in the primary air chamber 111.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.

Claims (9)

1. A high-speed preheat premix combustion apparatus, comprising:

the burner (100) is provided with a primary air chamber (111), a secondary air chamber (121), a gas chamber (131) and a mixing chamber, wherein the mixing chamber is positioned in front of the primary air chamber (111) and is communicated with the gas chamber (131); the outer peripheral wall surface of the burner (100) is provided with an air outlet (104) communicated with the primary air cavity (111) and an air inlet (105) communicated with the mixing cavity, and the front end surface of the burner (100) is provided with an air outlet (191) communicated with the secondary air cavity (121) and a premixing outlet communicated with the mixing cavity;

an outer sleeve (300) which has a cavity (302) and the rear end of which is sleeved on the front end of the burner (100);

the burner comprises an inner sleeve (200), an inner sleeve (200) and a burner tip (100), wherein the inner sleeve is arranged between the outer sleeve (300) and the burner tip (100), the front end of the inner sleeve penetrates through the front end face of the outer sleeve (300), the inner sleeve (200) is provided with a cavity (205) and a flame outlet (204) communicated with the cavity (205), and the peripheral wall surface of the inner sleeve (200) is provided with a preheating inlet (201) and a preheating outlet (202) which are communicated with the cavity (205); a first flow passage and a second flow passage which respectively extend along the front and the back are formed between the inner sleeve (200) and the outer sleeve (300), and the air outlet (104), the preheating inlet (201), the first flow passage, the second flow passage, the preheating outlet (202) and the air inlet (105) are communicated in sequence;

the outer circumferential wall surface of the inner sleeve (200) is provided with a partition plate (203) extending forwards and backwards, the partition plate (203) is connected with the inner circumferential surface of the outer sleeve (300), the partition plate (203) is arranged between the preheating inlet (201) and the preheating outlet (202), and the front end of the first flow passage is communicated with the front end of the second flow passage.

2. The high-speed preheating premixed combustion device according to claim 1, wherein the burner (100) comprises a plurality of gas conduits (150) and a premixing conduit (170), the gas conduits (150) are provided with a plurality of gas conduits, the rear ends of the gas conduits are communicated with the gas chamber, the premixing conduit (170) is provided with a plurality of gas conduits, the rear ends of the gas conduits are communicated with the mixing chamber, each gas conduit (150) is partially inserted into each premixing conduit (170), and the premixing outlet is arranged at the front end of the premixing conduit (170).

3. The high-speed preheating premixing combustion device according to claim 2, wherein the burner (100) further comprises a sleeve (112), a first air disk (160) and a second air disk (180), the sleeve (112) has an inner cavity (106), the air outlet (104) and the air inlet (105) are arranged on the outer peripheral wall surface of the sleeve (112), the premixing guide pipes (170) are arranged at intervals, the front end of the premixing guide pipe (170) penetrates through the second air disk (180), the rear end of the premixing guide pipe (170) penetrates through the first air disk (160), the first air disk (160) is provided with through air holes (161) which penetrate through the front and the rear, the second air disk (180) is provided with through swirl grooves (181) which penetrate through the front and the rear, the swirl grooves (181) are communicated with the through air holes (161), and the first air disk (160) and the second air disk (180) are positioned on the front side of the air inlet (105) and are respectively connected with the outer peripheral surface of the sleeve (112).

4. The high-speed preheating premixed combustion device according to claim 3, wherein the burner (100) further comprises a secondary air duct (120); second grade air duct (120) run through first aerofoil (160) and second aerofoil (180) around, second grade air duct (120) have second grade air cavity (121), the front end of second grade air duct (120) is equipped with air outlet (191), the rear end of second grade air duct (120) is equipped with second grade air inlet (103), and is many premix pipe (170) are the circumference setting around air outlet (191).

5. The high-speed preheating premixed combustion device according to claim 4, wherein the secondary air duct (120) is provided with air passages (192) extending forward and backward, the air passages (192) extending backward between the first air plate (160) and the second air plate (180) and communicating with the air through holes (161); the air passage (192) is provided in plurality and arranged circumferentially around the air outlet (191).

6. The high-speed preheating premixed combustion device according to claim 4, wherein the burner (100) further comprises a gas duct (130) and a casing (140); the shell (140) is located between the air inlet (105) and the air outlet (104) and connected with the inner circumferential surface of the sleeve (112), the rear end of the gas guide pipe (150) penetrates through the shell (140), and the front end of the gas pipeline (130) penetrates through the shell (140).

7. The high-speed preheating premixed combustion device according to claim 6, wherein the front end of the secondary air duct (120) sequentially penetrates through the gas duct (130), the housing (140), the first air plate (160) and the second air plate (180) and is coaxially arranged; a gap exists between the gas pipeline (130) and the secondary air pipeline (120).

8. The high-speed preheating premixed combustion device according to claim 1, wherein the preheating inlet (201) and the preheating outlet (202) are provided in two and are symmetrically arranged about the central axis of the inner sleeve (200).

9. The high-speed pre-heating premix burner apparatus as claimed in claim 8, further comprising a sealing plate (400); the sealing plate (400) is positioned on the front side of the outer sleeve (300) and is arranged between the inner sleeve (200) and the outer sleeve (300), and the sealing plate (400) is positioned in front of the partition plate (203).

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