CN206669743U

CN206669743U - From the low nitrogen fuel burner nozzle of preheating

Info

Publication number: CN206669743U
Application number: CN201720055903.9U
Authority: CN
Inventors: 黄显模
Original assignee: Beijing SUNTOUCH Thermprocess Equipment Co Ltd
Current assignee: Beijing SUNTOUCH Thermprocess Equipment Co Ltd
Priority date: 2017-01-18
Filing date: 2017-01-18
Publication date: 2017-11-24
Anticipated expiration: 2027-01-18

Abstract

The low nitrogen fuel burner nozzle of industrial furnace is the utility model is related to, especially with respect to a kind of from the low nitrogen fuel burner nozzle of preheating.It is characterized in that it is provided with heat-exchange tube between in outer tube and outside mozzle, the outlet termination of heat-exchange tube puts combustion chamber, the inside and outside fin bar of several columns longitudinal arrangement is equipped with inside and outside the tube wall of heat-exchange tube respectively, inside and outside fin bar forms by the inner and outer radial direction lug of tube wall is protruded from.Low nitrogen fuel burner nozzle is preheated certainly by what such scheme was implemented, due to carrying out the heat-exchange tube of heat transfer with combustion air there is provided the flue gas that backflows between outer tube and mozzle and exchanging the inside and outside fin bar for being respectively provided with line or helical arrangement the convex in longitudinal direction and evagination of tube wall.This structure reduces smog discharge temperature, and further improvement atmospheric environment etc. acquisition beneficial effect, more important is the more significant purpose for realizing energy-conservation of heat exchange structure not only in increase heat exchange area to improve heat exchanger effectiveness, energy-saving and emission-reduction.

Description

From the low nitrogen fuel burner nozzle of preheating

Technical field

The low nitrogen fuel burner nozzle of industrial furnace is the utility model is related to, is burnt especially with respect to a kind of from the low nitrogen combustion gas of preheating Mouth.

Background technology

With wreaking havoc for haze, requirement of the people to air quality and environmental protection is increasingly strict, clean combustion to fuel and The index request of its pollutant minimum discharge increasingly improves.It is well known that nitrogen oxides caused by fuel gas buring is to produce mist One of factor of haze.Therefore, the nitrogen oxides in air how is reduced, turning into improves needed for air quality and the key of environmental protection. Nitrogen oxides, such as NO, NO2, N2O3, N2O5 etc. are referred to as NOx, both typically are from the burning of fuel.And NOx caused by burning Mainly there are two：First, by reacting what is formed at high temperature by the nitrogen and oxygen that dissociate in combustion air during fuel combustion, it is referred to as height Warm Nox；Second, aoxidizing what is formed by the organic nitrogen compound in combustion gas, the organic nitrogen compound in combustion gas is decomposed into various at high temperature Nitrogenous free radical, they react to form volatile NOx in burner near zone and oxygen, referred to as fuel Nox.

High temperature Nox is noxious emission product caused by fuel combustion, is the main source of Nox in air.And fuel Nox It is relevant with the quality of fuel, eliminate or reduce by fuel purifying can.Therefore, low Nox burnings mainly solve high temperature Nox Emission problem.

During fuel gas buring, Nox generation concentration and temperature, nitrogen gas concn and the nitrogen of combustion zone are in high-temp combustion The factors such as the holdup time in region are relevant.In view of fire box temperature is determined by Technology for Heating Processing, can not change in principle, therefore, The structure and combustion technology of burner are to reduce Nox key point.

Known disclosed " industrial furnace fuel burner nozzle air deflector " (201320714519.7) and " the low nitrogen of industrial furnace Oxide fuel burner nozzle " (201320714517.8) two pieces patent, the structure for preferably solving low NOx drainage fuel burner nozzle are asked Topic, and be widely used among the important heating unit of industrial furnace.However, although the burner of this structure reduces NOx's Discharge, but still have limitation in terms of the recycling of high-temperature flue gas waste heat, only after using external heat exchanger, Fang Nengti Preheating of air temperature in high burner, to reach the purpose for saving the energy.Especially in indirectly heat (radiant tube heating) or The hot-working occasion of narrow space, it is more inadequate.

Utility model content

The purpose of this utility model, it is on the basis of a kind of existing low nitrogen gas nozzle structure, utilizes the high temperature to backflow Flue gas improves the preheating temperature of combustion air, to reach the purpose of energy-saving and emission-reduction.To realize above-mentioned purpose, using following Technical scheme：It is a kind of from preheating low nitrogen fuel burner nozzle, including outer tube, Gas Pipe, air hose, fume pipe, mozzle, nozzle, Air deflector, combustion chamber, it is characterized in that heat-exchange tube is provided between in outer tube and outside mozzle, the port of export connection of heat-exchange tube Combustion chamber, the interior fin bar of several columns longitudinal arrangement and outer fin bar are equipped with respectively inside and outside the tube wall of heat-exchange tube；In each row The axial uniform intervals of fin bar and outer fin bar along heat-exchange tube are set, and a fin bar row adjacent thereto are outer in each row sticks up Misphase is arranged at intervals radial direction of the slip along pipe each other；In each row the outer fin bar of fin bar and each row by several uniformly every Disconnected radial direction lug composition；Fin bar and the outer fin bar of each row are set to a continuous radial convex slip in each row；It is each Fin bar and the outer fin bar of each row are axially arranged at intervals along heat-exchange tube for the misphase of helical arrangement in row；Fin in each row Bar and the outer fin bar of each row are axially arranged at intervals along heat-exchange tube for the misphase of helical arrangement in the same direction；In each row fin bar and The outer fin bar of each row is arranged at intervals along the heat-exchange tube misphase that axially reverse acting spiral arranges each other；Fin bar and every in each row The one outer fin bar of row and the helical angle of heat-exchange tube axial screw arrangement are arranged to 5 degree to 30 degree；Fin bar and every in each row The one outer fin bar of row and the helical angle of heat-exchange tube axial screw arrangement are 20 degree；Heat-exchange tube is made as one with combustion chamber.

By such scheme implement from preheating low nitrogen fuel burner nozzle, due in outer tube with outside mozzle between be provided with Backflow flue gas and the heat-exchange tube that helps hot-air to carry out heat transfer, and tube wall is inside and outside is respectively provided with longitudinal straight trip exchanging Arrangement or the convex of helical arrangement and the fin bar of evagination.The pipe that the setting of ordered series of numbers convex and evagination fin bar is more simple can increase 1~4 times of heat exchange area, significantly improves heat exchanger effectiveness therefrom.Secondly, the flue gas that backflows of air stream is countered to Stream is advantageously conducted to air stream in by the residual temperature contained by it.This structure is not only in increase heat exchange area to improve hot friendship Efficiency, energy-saving and emission-reduction are changed, reduce smog discharge temperature and further reduce discharge of nitrogen oxides etc. obtaining beneficial to effect Fruit, more important is the more significant purpose for realizing energy-conservation and improving atmospheric environment of preheating heat exchange structure certainly.

Brief description of the drawings

Fig. 1 is a kind of vertical section structure schematic diagram of embodiment of the utility model；

Fig. 2 is a kind of cross-sectional view of heat-exchange tube in Fig. 1；

Fig. 3 is the structural representation of A--A sections in Fig. 2.

Embodiment

The heat-exchange tube and inside and outside fin being integrated with reference to a kind of inside and outside fin that accompanying drawing is shown with tube wall casting are vertical To the embodiment of straight row structure, further illustrated.It is so-called to preheat certainly, it is to utilize the high-temperature flue gas stream that backflows Waste heat, to preheat the temperature for improving combustion air.The utility model is by outer tube 4, Gas Pipe 2, air in existing one kind Carried out on the basis of the low nitrogen nozzle structure that pipe 1, fume pipe 3, mozzle 7, nozzle 6, air deflector 8, combustion chamber 9 are formed as follows Curve guide impeller.In the tube wall of outer tube 4 with outside the tube wall of mozzle 7 between be provided with heat-exchange tube 5, heat-exchange tube 5 and its The inside and outside fin of pipe is integrated with the casting of combustion chamber 9.To increase heat exchange area, 24 are equipped with respectively inside and outside the tube wall of heat-exchange tube The interior fin bar 52 of longitudinal straight row and outer fin bar 51 are classified as, interior fin bar 52 and outer fin bar 51 protrude by several Formed in the inner and outer radial direction lug 520 and 510 of tube wall.Wherein, in each row fin bar and outer fin bar along heat-exchange tube Axial uniform intervals are set, and radial direction of the outer fin bar of row that fin bar is adjacent thereto in each row along pipe is each other between misphase It is that fin bar is not interposing at same sagittal plane to fin bar outside with each column in each column every setting.To keep the exchange of heat exchange Area and heat exchange uniformity, you can by fin bar 51 outside fin bar 52 in each row and each row be arranged to several uniformly every Disconnected radial direction lug 520,510 (shown in accompanying drawing 1), fin bar outside fin bar in each row and each row can also be arranged to one The continuous radial convex slip of bar.Lug or continuous lug bar above-mentioned, be either interrupted, it can increase by 1 to 4 times of heat friendship Change area.To extend the switching path of backflow flue gas stream and air stream and increase heat-exchange time, to improve heat exchange efficiency, Mei Yilie The misphase that the outer fin bar of interior fin bar and each row can implement helical arrangement along the axial direction of heat-exchange tube is arranged at intervals that (this case is not shown Go out corresponding accompanying drawing).Wherein, in each row the outer fin bar of fin bar and each row can along the axial direction of heat-exchange tube for it is left-handed (or Dextrorotation) helical arrangement in the same direction misphase be arranged at intervals., can also be by fin bar in each row and each to improve heat exchanger effectiveness The outer fin bar of row is arranged at intervals along the heat-exchange tube misphase that axially reverse acting spiral arranges each other, and such as interior fin bar is left-handed, then outer Fin bar is dextrorotation, otherwise also such.With this similarly, the inner and outer uniform intervals of tube wall are set, radial direction is protruded from by several The interior fin bar 52 and outer fin bar 51 that inside and outside lug 520 and 510 is formed, can also be made as the helical fin bar uniformly separated. Suitable flow rate in being exchanged for the flue gas stream that keeps backflowing with air stream, this programme, fin bar in each row and each row is stuck up outside Slip and the helical angle of heat-exchange tube axial screw arrangement are arranged to 5 degree to 30 degree.The utility model provides more suitable helical angle It is --- fin bar and the outer fin bar of each row and the helical angle of heat-exchange tube axial screw arrangement are 20 degree in each row.When So, in the range of 5 degree to 30 degree of helical angle, the helical angle of the inside and outside fin bar of reverse acting spiral each other can also each be set It is set to the helical angle differed.

To other explanations of accompanying drawing, shown in the solid arrow in accompanying drawing 1 is the flue gas stream to be backflowed by radiant tube or burner hearth, Shown in dotted arrow is the air stream entered by air hose.

Claims

It is 1. a kind of improved from the low nitrogen fuel burner nozzle of preheating, including outer tube, Gas Pipe, air hose, fume pipe, mozzle, spray Mouth, air deflector, combustion chamber, it is characterized in that being provided with heat-exchange tube, the port of export of heat-exchange tube between in outer tube and outside mozzle Combustion chamber is connected, the interior fin bar of several columns longitudinal arrangement and outer fin bar are equipped with respectively inside and outside the tube wall of heat-exchange tube.
2. from low nitrogen fuel burner nozzle is preheated as described in claim 1, it is characterized in that fin bar and outer fin bar edge heat in each row The axial uniform intervals for exchanging pipe are set, and radial direction of the fin bar outer fin bar of row adjacent thereto along pipe is wrong each other in each row Separately set.
3. by low nitrogen fuel burner nozzle is preheated claim 1 or 2 described certainly, it is characterized in that being stuck up in each row outside fin bar and each row The radial direction lug that slip uniformly separates by several forms.
4. by low nitrogen fuel burner nozzle is preheated claim 1 or 2 described certainly, it is characterized in that being stuck up in each row outside fin bar and each row Slip is set to a continuous radial convex slip.
5. by low nitrogen fuel burner nozzle is preheated claim 1 or 2 described certainly, it is characterized in that being stuck up in each row outside fin bar and each row Slip is axially arranged at intervals along heat-exchange tube for the misphase of helical arrangement.
6. from low nitrogen fuel burner nozzle is preheated as described in claim 5, it is characterized in that fin bar and the outer fin of each row in each row Bar is axially arranged at intervals along heat-exchange tube for the misphase of helical arrangement in the same direction.
7. from low nitrogen fuel burner nozzle is preheated as described in claim 5, it is characterized in that fin bar and the outer fin of each row in each row Bar is arranged at intervals along the heat-exchange tube misphase that axially reverse acting spiral arranges each other.
8. by low nitrogen fuel burner nozzle is preheated claim 6 or 7 described certainly, it is characterized in that being stuck up in each row outside fin bar and each row Slip and the helical angle of heat-exchange tube axial screw arrangement are arranged to 5 degree to 30 degree.
9. from low nitrogen fuel burner nozzle is preheated as described in claim 8, it is characterized in that fin bar and the outer fin of each row in each row Bar and the helical angle of heat-exchange tube axial screw arrangement are 20 degree.
10. from low nitrogen fuel burner nozzle is preheated as described in claim 1, it is characterized in that heat-exchange tube is made as one with combustion chamber.