CN108759460B - Flame-adjustable combustor, mounting structure thereof and use method thereof - Google Patents
Flame-adjustable combustor, mounting structure thereof and use method thereof Download PDFInfo
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- CN108759460B CN108759460B CN201810630048.9A CN201810630048A CN108759460B CN 108759460 B CN108759460 B CN 108759460B CN 201810630048 A CN201810630048 A CN 201810630048A CN 108759460 B CN108759460 B CN 108759460B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 20
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 77
- 239000003034 coal gas Substances 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 238000004200 deflagration Methods 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 claims description 4
- 238000009991 scouring Methods 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000571 coke Substances 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 11
- 238000009826 distribution Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/42—Arrangement of controlling, monitoring, alarm or like devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
The invention relates to an adjustable flame burner and an installation structure and a use method thereof, wherein the adjustable flame burner comprises a burner body, air pipes and gas pipes connected with the burner body, and flow measuring and adjusting devices arranged on the air pipes and the gas pipes; the burner body is sequentially provided with a central air duct, an inner ring coal air duct, an inner ring air duct, an outer ring coal air duct and an outer ring air duct from inside to outside; the flame length and the outline of the adjustable flame burner are adjustable, the air-fuel ratio is adjustable, the gas and the gas distribution energy can be uniformly and completely mixed, the low NOx emission is realized while the calcination temperature is met, and the automatic adjustment, safety and controllability of the combustion process are realized; the adjustable flame burner has 2 working positions, and meets the requirements of normal operation and ignition, and the angle fine adjustment is realized through soft sealing, so that the flame is ensured not to scour a kiln liner.
Description
Technical Field
The invention relates to a burner, in particular to a flame-adjustable burner for a rotary kiln, an installation structure and a use method thereof.
Background
The rotary kiln is widely applied to the fields of metallurgy, chemical industry, building materials and the like, and the burner is a core component of the rotary kiln. Currently, most of domestic gas-fired rotary kiln burners are in a lagging state in terms of performance index and control level, and are mainly characterized in that a manual ignition mode is adopted, no air-fuel ratio is automatically controlled, so that the temperature difference in the kiln is large, and the quality of calcined products is poor; in addition, the traditional gas burning burner has the defects of small regulation ratio, unadjustable flame, uneven gas mixing, incomplete combustion, unsafe and the like. In addition, the burner is fixed on the kiln head cover, the inclination angle of the burner is fixed, no adjustment margin exists, and the use performance and the use effect of the burner are shaped after the design and the installation are finished, so that the burner cannot be optimized through adjustment after the installation; if the flame is found to directly wash the kiln liner in use, the kiln liner can only be reinstalled after disassembly.
As is well known, the structural design of the burner is mainly based on the factors of the type of fuel, public and auxiliary parameters, the combustion performance requirement of thermal equipment and the like, and one of the requirements of full combustion is that the fuel and the air need to be effectively, completely and uniformly mixed; for gaseous fuels, the higher the heating value, the greater the air distribution, and the greater the air distribution, the more difficult it is to uniformly mix. While at the same time, for rotary kilns, a sufficiently long flame length is required, which is an important factor affecting the calcining effect of the calciner, the quality of the calcination of the material and the life of the kiln liner. Therefore, to obtain a process temperature system which simultaneously meets the requirements of the kiln head region, the heating belt and the calcining belt, the flame of the burner needs to have better adjustable performance, and a certain adjustment room is also provided for the outer flame profile in order to avoid the flame from scouring the kiln liner.
In summary, a burner with adjustable flame length and profile, full combustion, energy conservation and environmental protection is developed, automatic air-fuel ratio adjustment is realized, and the burner is matched with safety protection functions such as automatic ignition, flameout alarm and the like, thereby having important significance for improving the production efficiency of the rotary kiln, improving the quality of calcined products and the like.
Disclosure of Invention
The invention provides an adjustable flame burner, a mounting structure and a using method thereof, wherein the adjustable flame burner has adjustable flame length, adjustable outline and adjustable air-fuel ratio, gas and gas distribution can be uniformly and completely mixed, the low NOx emission is realized while the calcination temperature is met, and the automatic adjustment, safety and controllability of the combustion process are realized; the adjustable flame burner has 2 working positions, and meets the requirements of normal operation and ignition, and the angle fine adjustment is realized through soft sealing, so that the flame is ensured not to scour a kiln liner.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the adjustable flame burner comprises a burner body, air pipes and gas pipes connected with the burner body, and flow measuring and adjusting devices arranged on the air pipes and the gas pipes; the burner body is sequentially provided with a central air duct, an inner ring coal air duct, an inner ring air duct, an outer ring coal air duct and an outer ring air duct from inside to outside; the front end of the burner body is provided with a burner nozzle; the inner ring coal air flue and the central air flue are retracted at the burner nozzle for a certain distance, and a mixed deflagration chamber is formed in a space between the end surfaces of the inner ring coal air flue and the central air flue and the end surface of the burner nozzle; the outer ring air duct is provided with a diameter-reducing section and a multi-flow jet structure at the position close to the end face of the burner jet, and the front area of the diameter-reducing section forms a flame stabilizing area; an annular hole multi-flow jet structure is arranged between an inner annular coal air passage and a central air passage close to the burner jet, and a plurality of swirl plates are arranged between an outer annular coal air passage and the inner annular air passage close to the burner jet; a flame sight glass and a flame detector are arranged at the rear end cover of the central air duct; the rear end sides of the central air duct, the inner ring air duct and the outer ring air duct are respectively provided with an air duct interface which is connected with the corresponding air duct, and the rear end sides of the inner ring air duct and the outer ring air duct are respectively provided with a gas duct interface which is connected with the corresponding gas duct; the outer wall of the high-temperature section of the burner body is made of nickel-chromium alloy seamless steel pipes, a high-temperature resistant castable layer is further arranged on the outer wall of the burner body, and the burner body is connected with the high-temperature resistant castable layer in an anchoring manner through an anchoring hook.
The installation structure of the adjustable flame burner is characterized in that the adjustable flame burner is arranged at the center of a kiln head cover of the rotary kiln, a sliding sleeve is arranged at the installation position, the front part of a burner body stretches into the rotary kiln, the rear part of the burner body is supported by a burner hanging bracket in a hanging manner, a travelling trolley is arranged at the top of the burner hanging bracket, the burner body is driven to move along the sliding sleeve by the burner hanging bracket of the travelling trolley, and the burner body is enabled to have 2 states of stretching forwards and backwards and corresponds to a normal working position and an ignition working position respectively; an electronic igniter extending hole is arranged on the kiln head cover above the burner body; the soft seal is arranged between the burner body and the sliding sleeve, so that the burner body and the sliding sleeve are always in sealing connection, and the burner body can realize angle fine adjustment; the air pipe and the gas pipe which are directly connected with the adjustable flame burner are all made of metal hoses, and the other ends of the metal hoses are respectively connected with corresponding medium conveying pipelines.
The soft seal is a labyrinth seal structure made of refractory fiber cotton, the outer side of the sliding sleeve is provided with a seal cover, and the seal cover is fixedly connected with the sliding sleeve through a fastening bolt.
A method of using an adjustable flame burner, comprising:
1) Coke oven gas is used as a gas source, and is sent to an inner ring gas flue of the adjustable flame burner through a first gas medium conveying pipeline after passing through a pressure stabilizing and filtering gas tank, and is sent to an outer ring gas flue of the adjustable flame burner through a second gas medium conveying pipeline, and a flow orifice plate and an automatic regulating valve are respectively arranged on the first gas medium conveying pipeline and the second gas medium conveying pipeline;
2) Air is used as a combustion-supporting air source, and is sent to the central air channel and the inner ring air channel through a first combustion-supporting air medium conveying pipeline and is sent to the outer ring air channel through a second combustion-supporting air medium conveying pipeline by a variable-frequency fan; the first and second combustion-supporting air medium conveying pipelines are respectively provided with a flow orifice plate and an automatic regulating valve;
3) The electronic igniter is driven by the cylinder, the electronic igniter stretches into the kiln head cover to ignite when the electronic igniter ignites, and the burner body retreats to an ignition working position when the electronic igniter ignites, so that the moving stroke of the electronic igniter is shortened, and the electronic igniter can be protected from being burnt at high temperature; after ignition, the electronic igniter automatically exits the ignition area, and the burner body returns to the normal working position; the movement of the burner body between 2 working positions is limited by a travel switch;
4) After the ignition and combustion of the adjustable flame burner, the central air of the central air duct, the inner annular air of the inner annular air duct and the inner annular gas of the inner annular gas duct carry one layer of gas through two layers of air, and the central air and the inner annular air are used as flame adjusting air for forward diffusion and along-range combustion, so that inner flame with adjustable length is formed through air quantity adjustment; the inner ring gas is sprayed out in the form of annular holes and multiple flows, and is uniformly and completely mixed with the direct-current central wind and the inner ring wind in the mixed explosion chamber; the central wind, the inner ring wind and the inner ring gas control the air-fuel ratio by flow pore plates and automatic regulating valves on corresponding medium conveying pipelines, and a temperature closed-loop control mode of flow feedforward is adopted; when the flame needs to be stretched, the supply amount of combustion-supporting air and coal gas is increased, and the purpose of the flame-supporting air and the coal gas is to increase the temperature of a calcining zone; when the flame needs to be shortened, the supply quantity of combustion-supporting air and coal gas is reduced, which is beneficial to the improvement of the kiln head temperature; the oxygen-deficient flue gas is sucked inwards in the combustion process, so that the local high temperature of the flame is reduced, and the low-nitrogen combustion is realized;
5) After the ignition and combustion of the adjustable flame burner, the outer flame formed by the outer ring wind of the outer ring air duct and the outer ring coal gas of the outer ring coal gas duct is stably combusted; the outer ring gas is sprayed out in a form of a circular rotational flow and multiple flows, is mixed with direct-current outer ring wind, and controls the air-fuel ratio through a flow orifice plate and an automatic regulating valve on a corresponding medium conveying pipeline; forming a stable outer flame profile through a flame stabilizing region of the reducing section, and fully utilizing the expansion energy of the deflagration gas to improve the injection kinetic energy and the temperature of a kiln head region; the outer flame is used as an ignition source at the same time, and the flame can be prevented from scouring the kiln liner by finely adjusting the angle of the burner body, so that the service life of the kiln liner is prolonged;
6) The flow pore plate and the automatic regulating valve on each medium conveying pipeline connected with the adjustable flame burner are connected with the control system respectively, and when the automatic regulation of the flame of the adjustable flame burner is realized, the combustion condition is monitored in real time through the flame detector and the flame sight glass, and when the gas is extinguished, the automatic alarm and the re-ignition are realized through the electronic igniter, so that the safety and the controllability of the whole combustion process are ensured.
Compared with the prior art, the invention has the beneficial effects that:
1) The air-fuel ratio can be automatically controlled when the flame-adjustable burner burns, so that burning loss caused by excessive air and incomplete combustion caused by insufficient air can be effectively avoided;
2) The central wind and the inner ring wind are flame adjusting wind, and the flame length can be increased through air quantity adjustment; the inner ring gas is sprayed out in the form of annular holes and multiple flows, and is uniformly and completely mixed with the direct-current central wind and the inner ring wind, and the regulation ratio is large;
3) The outer ring wind is flame stabilizing wind, and simultaneously is used as ignition wind, and the outline of the outer flame can be adjusted through adjusting the air quantity of the outer ring and the gas quantity of the outer ring; the outer ring gas is sprayed out in a form of a circular rotational flow and multiple flows, and is uniformly and completely mixed with the direct-current outer ring wind gas;
4) The central air, the inner annular air and the inner annular gas are combusted in an inner mixing and outer diffusion mode, so that the central backflow flue gas avoids a high temperature area and is burnt in an oxygen-deficient mode, the aim of low NOx emission is fulfilled, and the energy-saving and environment-friendly effects are achieved;
5) The outer front end of the adjustable flame burner is provided with the diameter-reducing section and the multi-flow nozzle structure, so that the flame stabilizing effect can be achieved, the expansion energy of the deflagration gas can be fully utilized, and the injection kinetic energy can be increased;
6) The flame detector is arranged in the adjustable flame burner, has a warning function when in flameout, can send an automatic ignition instruction to the electronic igniter through the control system, and has high safety and strong controllability;
7) An external electronic igniter of the kiln head cover is controlled by a control system, and is propelled by a cylinder to automatically ignite in the kiln, and automatically exits from an ignition area after ignition; the burner body moves backwards during ignition, so that the moving stroke of the electronic igniter can be shortened, the spot electric igniter is protected from being burnt out at high temperature, and the service life of the spot electric igniter is prolonged;
8) The burner body can quantitatively move front and back at the installation position of the kiln head cover, and the flame length in the kiln can be further increased after the burner body moves forward; when the electronic igniter moves backwards, the electronic igniter is convenient to ignite; the soft seal enables the angle of the burner body to be finely adjusted, and ensures that flames do not scour kiln liners; when the burner body moves, the burner body is driven by a travelling trolley at the top of the burner hanger, and the effective connection with each medium conveying pipeline is realized through a metal hose;
9) The adjustable flame burner has simple structure and convenient manufacture, and can be manufactured into series products according to the heat load.
Drawings
Fig. 1 is a schematic view of a flame burner according to the present invention.
FIG. 2 is a schematic view of the installation of the flame burner of the present invention (when extended)
FIG. 3 is a schematic diagram showing the installation of the flame-adjustable burner according to the present invention (retracted)
Fig. 4 is a schematic view of the use state of the adjustable flame burner according to the present invention.
FIG. 5 is a second schematic view of the adjustable flame burner according to the present invention.
In the figure: 1. the central air duct 2, the inner ring air duct 3, the flame sight glass 4, the flame detector 5, the inner ring coal air duct 6, the outer ring coal air duct 7, the burner hanger 8, the outer ring air duct 9, the anchoring hook 10, the high temperature resistant pouring material layer 11, the cyclone sheet 12, the flame stabilizing area 13, the deflagration mixing chamber 14, the high temperature section outer wall 15, the rear end cover 16, the screw plug 18, the electronic igniter 19, the kiln hood 20, the burner body 21, the sealing cover 22, the fastening bolt 23, the soft sealing 24, the flow pore plate 25, the automatic regulating valve 26, the calcining area thermocouple 27, the kiln head thermocouple 28, the running trolley 29, the stable pressure filtering air tank 30, the variable frequency fan 31, the kiln body
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1, the adjustable flame burner of the present invention comprises a burner body 20, air pipes and gas pipes connected with the burner body 20, and flow measuring and adjusting devices arranged on the air pipes and the gas pipes; the burner body 20 is sequentially provided with a central air duct 1, an inner ring coal air duct 5, an inner ring air duct 2, an outer ring coal air duct 6 and an outer ring air duct 8 from inside to outside; the front end of the burner body 20 is a burner nozzle; the inner ring coal gas passage 5 and the central air passage 1 are retracted at the burner nozzle for a certain distance, and a mixed deflagration chamber 13 is formed in a space between the inner ring coal gas passage 5 and the end face of the central air passage 1 and the end face of the burner nozzle; the outer ring air duct 8 is provided with a diameter-reducing section and a multi-flow nozzle structure near the end face of the burner nozzle, and the front area of the diameter-reducing section forms a flame stabilizing area 12; an annular hole multi-flow jet structure is arranged between an inner annular coal air passage 5 close to the burner jet and the central air passage 1, and a plurality of swirl vanes 11 are arranged between an outer annular coal air passage 6 close to the burner jet and the inner annular air passage 2; a flame sight glass 3 and a flame detector 4 are arranged at the rear end cover 16 of the central air duct 1; the rear end sides of the central air duct 1, the inner ring air duct 2 and the outer ring air duct 8 are respectively provided with an air duct interface and are connected with corresponding air ducts, and the rear end sides of the inner ring air duct 5 and the outer ring air duct 6 are respectively provided with a gas duct interface and are connected with corresponding gas ducts; the outer wall 14 of the high temperature section of the burner body 20 is made of nickel-chromium alloy seamless steel pipes, the outer part of the burner body is also provided with a high temperature resistant castable layer 10, and the burner body 20 and the high temperature resistant castable layer 10 are connected in an anchoring way through an anchoring hook 9.
As shown in fig. 3 and 4, in the installation structure of the adjustable flame burner of the present invention, the adjustable flame burner is installed at the center of a kiln head cover 19 of a rotary kiln, a sliding sleeve is arranged at the installation position, the front part of a burner body 20 stretches into the rotary kiln, the rear part is suspended and supported by a burner hanger 7, a travelling trolley 28 is arranged at the top of the burner hanger 7, the burner hanger 7 drives the burner body 20 to move along the sliding sleeve through the travelling trolley 28, and the burner body 20 has 2 states of forward extension and backward extension and respectively corresponds to a normal working position (shown in fig. 3) and an ignition working position (shown in fig. 4); an electronic igniter extending hole is arranged on the kiln head cover 19 above the burner body 20; a soft seal 23 is arranged between the burner body 20 and the sliding sleeve, so that the burner body 20 and the sliding sleeve are always in sealing connection, and the burner body 20 can realize angle fine adjustment; the air pipe and the gas pipe which are directly connected with the adjustable flame burner are respectively provided with a metal hose 15, and the other end of the metal hose 15 is respectively connected with a corresponding medium conveying pipeline.
The soft seal 23 is a labyrinth seal structure made of refractory fiber cotton, the outer side of the sliding sleeve is provided with a sealing cover 21, and the sealing cover 21 is fixedly connected with the sliding sleeve through a fastening bolt 22.
As shown in fig. 5, a method for using the adjustable flame burner includes:
1) Coke oven gas is used as a gas source, and is sent to an inner ring gas flue 5 of the adjustable flame burner through a first gas medium conveying pipeline after passing through a pressure stabilizing filter gas tank 29, and is sent to an outer ring gas flue 6 of the adjustable flame burner through a second gas medium conveying pipeline, wherein a flow orifice plate 24 and an automatic regulating valve 25 are respectively arranged on the first gas medium conveying pipeline and the second gas medium conveying pipeline;
2) Air is taken as a combustion-supporting air source, and is sent to the central air duct 1 and the inner annular air duct 2 through a first combustion-supporting air medium conveying pipeline by the variable frequency fan 30, and is sent to the outer annular air duct 8 through a second combustion-supporting air medium conveying pipeline; the first and second combustion-supporting air medium conveying pipelines are respectively provided with a flow orifice plate 24 and an automatic regulating valve 25;
3) The electronic igniter 18 is driven by a cylinder, the electronic igniter 18 stretches into the kiln head cover 19 to ignite when the electronic igniter 18 ignites, the burner body 20 retreats to an ignition working position, so that the moving stroke of the electronic igniter 18 is shortened, and the electronic igniter 18 can be prevented from being burnt at a high temperature; after ignition, the electronic igniter 18 automatically exits the ignition zone and the burner body 20 returns to the normal operating position; the movement of the burner body 20 between the 2 operating positions is limited by a travel switch;
4) After the ignition and combustion of the adjustable flame burner, the central air of the central air duct 1, the inner annular air of the inner annular air duct 2 and the inner annular gas of the inner annular gas duct 5 carry one layer of gas through two layers of air, and the central air and the inner annular air are used as flame adjusting air for forward diffusion and along-range combustion, so that inner flame with adjustable length is formed through air quantity adjustment; the inner ring gas is sprayed out in the form of annular holes and multiple flows, and is uniformly and completely mixed with the direct-current central wind and the inner ring wind in the mixed explosion chamber 13; the central wind, the inner ring wind and the inner ring gas control the air-fuel ratio by the flow orifice plate 24 and the automatic regulating valve 15 on the corresponding medium conveying pipeline, and adopt a temperature closed-loop control mode of flow feedforward; when the flame needs to be stretched, the supply amount of combustion-supporting air and coal gas is increased, and the purpose of the flame-supporting air and the coal gas is to increase the temperature of a calcining zone; when the flame needs to be shortened, the supply quantity of combustion-supporting air and coal gas is reduced, which is beneficial to the improvement of the kiln head temperature; the oxygen-deficient flue gas is sucked inwards in the combustion process, so that the local high temperature of the flame is reduced, and the low-nitrogen combustion is realized;
5) After the ignition and combustion of the adjustable flame burner, the outer flame formed by the outer ring wind of the outer ring wind channel 8 and the outer ring coal gas of the outer ring coal gas channel 6 is stably combusted; the outer ring gas is sprayed out in a form of a circular rotational flow and multiple flows, is mixed with direct-current outer ring wind, and controls the air-fuel ratio through a flow orifice plate 24 and an automatic regulating valve 25 on a corresponding medium conveying pipeline; a stable outer flame profile is formed through the flame stabilizing zone 12 of the reducing section, and the expansion energy of the deflagration gas is fully utilized to improve the injection kinetic energy and the temperature of the kiln head zone; the outer flame is used as an ignition source at the same time, and the flame can be prevented from scouring the kiln liner by finely adjusting the angle of the burner body 20, so that the service life of the kiln liner is prolonged;
6) The flow orifice plate 24, the automatic regulating valve 25 on each medium conveying pipeline of the adjustable flame burner are connected, the flame sight glass 3 and the flame detector 4 on the adjustable flame burner, the kiln head zone thermocouple 27 arranged on the kiln head cover 19, the calcination zone thermocouple 26 arranged on the rotary kiln body 31, the external electronic igniter 18 of the kiln head cover 29 and the travelling trolley 28 at the top of the burner hanger 7 are respectively connected with a control system, so that the automatic regulation of the flame of the adjustable flame burner is realized, the combustion condition is monitored in real time through the flame detector 4 and the flame sight glass 3, and when the gas is extinguished, the gas is automatically alarmed and re-ignited through the electronic igniter 18, and the safety and the controllability of the whole combustion process are ensured.
In the invention, the traveling trolley 28 adopts an electric traveling trolley to match with the movement of the adjustable flame burner, the flame detector 4 and the plug 17 are arranged on the rear end cover 16, and the control system adopts a PLC automatic control system. TI in FIG. 5 represents a temperature display instrument, TT represents a temperature transmitter, and TE represents a test measurement element.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. The use method of the adjustable flame burner is characterized in that the adjustable flame burner comprises a burner body, air pipes and gas pipes connected with the burner body, and flow measuring and adjusting devices arranged on the air pipes and the gas pipes; the burner body is sequentially provided with a central air duct, an inner ring coal air duct, an inner ring air duct, an outer ring coal air duct and an outer ring air duct from inside to outside; the front end of the burner body is provided with a burner nozzle; the inner ring coal air flue and the central air flue are retracted at the burner nozzle for a certain distance, and a mixed deflagration chamber is formed in a space between the end surfaces of the inner ring coal air flue and the central air flue and the end surface of the burner nozzle; the outer ring air duct is provided with a diameter-reducing section and a multi-flow jet structure at the position close to the end face of the burner jet, and the front area of the diameter-reducing section forms a flame stabilizing area; an annular hole multi-flow jet structure is arranged between an inner annular coal air passage and a central air passage close to the burner jet, and a plurality of swirl plates are arranged between an outer annular coal air passage and the inner annular air passage close to the burner jet; a flame sight glass and a flame detector are arranged at the rear end cover of the central air duct; the rear end sides of the central air duct, the inner ring air duct and the outer ring air duct are respectively provided with an air duct interface which is connected with the corresponding air duct, and the rear end sides of the inner ring air duct and the outer ring air duct are respectively provided with a gas duct interface which is connected with the corresponding gas duct; the outer wall of the high-temperature section of the burner body is made of nickel-chromium alloy seamless steel pipes, a high-temperature resistant castable layer is arranged outside the burner body, and the burner body is connected with the high-temperature resistant castable layer in an anchoring manner through an anchoring hook; the adjustable flame burner is arranged at the center of a kiln head cover of the rotary kiln, a sliding sleeve is arranged at the center of the kiln head cover, the front part of the burner body stretches into the rotary kiln, the rear part of the burner body is supported in a hanging way through a burner hanging bracket, a travelling trolley is arranged at the top of the burner hanging bracket, the burner body is driven to move along the sliding sleeve by the burner hanging bracket of the travelling trolley, and the burner body is enabled to have 2 states of stretching forwards and shrinking backwards and corresponds to a normal working position and an ignition working position respectively; an electronic igniter extending hole is arranged on the kiln head cover above the burner body; the soft seal is arranged between the burner body and the sliding sleeve, so that the burner body and the sliding sleeve are always in sealing connection, and the burner body can realize angle fine adjustment; the air pipe and the gas pipe which are directly connected with the adjustable flame burner are all made of metal hoses, and the other ends of the metal hoses are respectively connected with corresponding medium conveying pipelines;
the using method of the flame-adjustable burner comprises the following steps:
1) Coke oven gas is used as a gas source, and is sent to an inner ring gas flue of the adjustable flame burner through a first gas medium conveying pipeline after passing through a pressure stabilizing and filtering gas tank, and is sent to an outer ring gas flue of the adjustable flame burner through a second gas medium conveying pipeline, and a flow orifice plate and an automatic regulating valve are respectively arranged on the first gas medium conveying pipeline and the second gas medium conveying pipeline;
2) Air is used as a combustion-supporting air source, and is sent to the central air channel and the inner ring air channel through a first combustion-supporting air medium conveying pipeline and is sent to the outer ring air channel through a second combustion-supporting air medium conveying pipeline by a variable-frequency fan; the first and second combustion-supporting air medium conveying pipelines are respectively provided with a flow orifice plate and an automatic regulating valve;
3) The electronic igniter is driven by the cylinder, the electronic igniter stretches into the kiln head cover to ignite when the electronic igniter ignites, and the burner body retreats to an ignition working position when the electronic igniter ignites, so that the moving stroke of the electronic igniter is shortened, and the electronic igniter can be protected from being burnt at high temperature; after ignition, the electronic igniter automatically exits the ignition area, and the burner body returns to the normal working position; the movement of the burner body between 2 working positions is limited by a travel switch;
4) After the ignition and combustion of the adjustable flame burner, the central air of the central air duct, the inner annular air of the inner annular air duct and the inner annular gas of the inner annular gas duct carry one layer of gas through two layers of air, and the central air and the inner annular air are used as flame adjusting air for forward diffusion and along-range combustion, so that inner flame with adjustable length is formed through air quantity adjustment; the inner ring gas is sprayed out in the form of annular holes and multiple flows, and is uniformly and completely mixed with the direct-current central wind and the inner ring wind in the mixed explosion chamber; the central wind, the inner ring wind and the inner ring gas control the air-fuel ratio by flow pore plates and automatic regulating valves on corresponding medium conveying pipelines, and a temperature closed-loop control mode of flow feedforward is adopted; when the flame needs to be stretched, the supply amount of combustion-supporting air and coal gas is increased, and the purpose of the flame-supporting air and the coal gas is to increase the temperature of a calcining zone; when the flame needs to be shortened, the supply quantity of combustion-supporting air and coal gas is reduced, which is beneficial to the improvement of the kiln head temperature; the oxygen-deficient flue gas is sucked inwards in the combustion process, so that the local high temperature of the flame is reduced, and the low-nitrogen combustion is realized;
5) After the ignition and combustion of the adjustable flame burner, the outer flame formed by the outer ring wind of the outer ring air duct and the outer ring coal gas of the outer ring coal gas duct is stably combusted; the outer ring gas is sprayed out in a form of a circular rotational flow and multiple flows, is mixed with direct-current outer ring wind, and controls the air-fuel ratio through a flow orifice plate and an automatic regulating valve on a corresponding medium conveying pipeline; forming a stable outer flame profile through a flame stabilizing region of the reducing section, and fully utilizing the expansion energy of the deflagration gas to improve the injection kinetic energy and the temperature of a kiln head region; the outer flame is used as an ignition source at the same time, and the flame can be prevented from scouring the kiln liner by finely adjusting the angle of the burner body, so that the service life of the kiln liner is prolonged;
6) The flow pore plate and the automatic regulating valve on each medium conveying pipeline connected with the adjustable flame burner are connected with the control system respectively, and when the automatic regulation of the flame of the adjustable flame burner is realized, the combustion condition is monitored in real time through the flame detector and the flame sight glass, and when the gas is extinguished, the automatic alarm and the re-ignition are realized through the electronic igniter, so that the safety and the controllability of the whole combustion process are ensured.
2. The method of using an adjustable flame burner of claim 1, wherein the soft seal is a labyrinth seal structure made of refractory fiber cotton, and a sealing cover is arranged on the outer side of the sliding sleeve and fixedly connected with the sliding sleeve through a fastening bolt.
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| CN111763018A (en) * | 2019-04-02 | 2020-10-13 | 北京卡卢金热风炉技术有限公司 | Heating furnace device with burner |
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