CN114777119A - Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner - Google Patents
Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner Download PDFInfo
- Publication number
- CN114777119A CN114777119A CN202210269964.0A CN202210269964A CN114777119A CN 114777119 A CN114777119 A CN 114777119A CN 202210269964 A CN202210269964 A CN 202210269964A CN 114777119 A CN114777119 A CN 114777119A
- Authority
- CN
- China
- Prior art keywords
- cylinder
- flue gas
- burner
- tube
- collecting box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000003546 flue gas Substances 0.000 title claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 77
- 239000000779 smoke Substances 0.000 claims abstract description 55
- 239000007921 spray Substances 0.000 claims abstract description 8
- 210000001503 joint Anatomy 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 19
- 238000002347 injection Methods 0.000 abstract description 7
- 239000007924 injection Substances 0.000 abstract description 7
- 238000012986 modification Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000000137 annealing Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/66—Preheating the combustion air or gas
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention aims to provide a double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner which comprises a smoke collection box, a capillary tube heat exchanger, an air tube, a main shell, an injection spray pipe, a connecting pipe, a burner, a finned tube heat exchanger and a W-shaped radiant tube. The invention utilizes the flue gas to exchange heat for two strokes of combustion air, thereby reducing emission and consumption, having low exhaust gas temperature, low NOx and simple and convenient maintenance and modification.
Description
Technical Field
The invention belongs to the field of radiant tube burners, and particularly relates to a double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner.
Background
With the increasingly strict requirements on energy conservation and emission reduction in China, the traditional W-shaped self-preheating burner can not meet the requirements on NOx emission and energy consumption for energy conservation and emission reduction. The conventional flue gas backflow technology has the problems of high exhaust gas temperature and high energy consumption relative to a conventional burner at present, and is a main approach for further reducing the energy consumption standard of ton steel, reducing emission, saving energy and improving energy efficiency, while the W-type self-preheating burner is mainly applied to an annealing furnace, a horizontal galvanizing furnace, a normalizing furnace and a heat treatment furnace, and the W-type self-preheating burner has large power range (generally in the range of 60-300 kw), but has limited installation space and is difficult to improve energy conservation and emission reduction.
Disclosure of Invention
The invention aims to provide a double-stroke heat exchange flue gas reflux high-energy-efficiency W-shaped radiant tube burner, which utilizes flue gas to exchange heat of two strokes of combustion air, reduces emission and consumption, has low exhaust gas temperature and NOx, and is simple and convenient to maintain and reform.
The technical scheme adopted by the invention is as follows:
a double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner comprises a burner (7) arranged at one end of a W-shaped radiant tube (9) through a burner shell (7.4), a finned tube heat exchanger (8) positioned in the other end of the W-shaped radiant tube (9), a capillary tube heat exchanger (2) provided with four layers of cylinders, a main shell (4) provided with a smoke isolating bin (4.4) and three intercommunicating interfaces, a smoke collecting box (1) and an air tube (3); in the capillary tube heat exchanger (2), a first cylinder (2.5) to a fourth cylinder (2.9) are sequentially arranged from outside to inside, the first cylinder (2.5) and the second cylinder (2.4) form a closed annular cavity, the side part and one end of the annular cavity are respectively communicated with an air inlet pipe (2.6) and an inlet gas collecting box (2.10), capillary heat exchange tubes (2.7) are distributed between the third cylinder (2.8) and the fourth cylinder (2.9), two ends of the capillary heat exchange tubes are respectively sealed and communicated with the inlet gas collecting box (2.10) and an outlet gas collecting box (2.3), the fourth cylinder (2.9), the third cylinder (2.8) and the second cylinder (2.4) form a labyrinth type flue gas channel, the outlet of the flue gas channel is connected with a flue gas collecting box (1), and the flue gas collecting box (1) and the air inlet pipe (2.6) are respectively and externally connected with a smoke exhaust pipeline and a combustion-supporting air pipeline; in the main shell (4), a first connector (4.5), a second connector (4.6) and a third connector (4.1) are respectively communicated with a combustion-supporting air port of the burner shell (7.4), the other end of the W-shaped radiant tube (9) and a flue gas channel inlet of the capillary tube heat exchanger (2) in a butt joint mode, the side portion of the smoke isolating bin (4.4) is in butt joint with the ejector spray pipe (5), one end of the smoke isolating bin is in butt joint with the finned tube heat exchanger (8), the ejector spray pipe (5) is located at the first connector (4.5), one end of the air tube (3) penetrates the smoke isolating bin (4.4) in a sealing mode and then extends into the finned tube heat exchanger (8) to the bottom, and the other end of the air tube penetrates through the third connector (4.1) and then extends into a fourth barrel (2.9) to be communicated with the outlet gas collecting box (2.3).
Furthermore, in the capillary heat exchanger (2), two ends of a cylinder I (2.5) are respectively provided with a flange (2.1) and a flange (2.11), the flange (2.1) and the flange (2.11) are respectively butted with a smoke collecting box (1) and a connector III (4.1), two ends of a cylinder II (2.4) are arranged on the flange (2.1) and an inlet gas collecting box (2.10), one end of a ring cavity is blocked by the flange (2.1), the other end of the ring cavity is blocked by the inlet gas collecting box (2.10) but is provided with a communicating hole, two ends of a cylinder III (2.8) and a cylinder IV (2.9) are respectively arranged on the inlet gas collecting box (2.10) and an outlet gas collecting box (2.3), a part of the cylinder IV (2.9) close to the inlet gas collecting box (2.10) is provided with a communicating hole, a part of the cylinder III (2.8) close to the gas collecting outlet gas collecting box (2.3) is provided with a communicating hole, one side of the outlet box (2.3) is provided with a communicating hole butted with an air pipe (3), the other side is sealed by a cover plate (2.2).
Furthermore, the capillary heat exchange tubes (2.7) are flat and expansion parts are distributed along the lines.
Further, the main structure of the main shell (4) is a four-way shell (4.2) and a shell pouring material (4.3), wherein the three-way corresponds to a first interface (4.5), a second interface (4.6) and a third interface (4.1) respectively, the rest of the three-way is used for installing a smoke isolating bin (4.4), and a sealing plate is installed after the smoke isolating bin (4.4) is installed to simultaneously seal one end of the smoke isolating bin (4.4) and the rest of the three-way.
Furthermore, in the burner (7), an ignition electrode (7.3) and a gas pipe (7.6) both penetrate through a burner shell (7.4) and extend into a W-shaped radiant tube (9), the ignition electrode (7.3) and the gas pipe (7.6) are installed on the burner shell (7.4) through an end plate (7.5), the burner shell (7.4) is plugged by the end plate (7.5), the outer end of the gas pipe (7.6) is externally connected with a gas pipeline, the inner end of the gas pipe is provided with a gas nozzle (7.2), an air distribution disc (7.1) is installed on the gas nozzle (7.2), the outer end of the ignition electrode (7.3) is externally connected with a high-pressure bag, the inner end of the ignition electrode extends into the air distribution disc (7.1), and forms a certain angle and distance with a spray hole of the gas nozzle (7.2).
Furthermore, in the air pipe (3), an air pipe main body (3.3) is L-shaped, and the part of the air pipe main body (3.3) in the capillary heat exchanger (2) is provided with an expansion joint (3.2) and is communicated with an outlet gas collecting box (2.3) through a flange (3.1).
Furthermore, the finned tube heat exchanger (8) is cylindrical and comprises a connecting cylinder (8.1), an inner finned tube, an outer finned tube (8.2) and a bulb (8.3) which are welded in sequence.
Furthermore, in the smoke collection box (1), the smoke collection box main body (1.2) is in a frustum shape with a wide front part and a narrow back part, the side part of the smoke collection box main body (1.2) is connected with a branch pipe (1.3) of a valve (1.4), and the front end and the back end of the smoke collection box main body (1.2) are respectively externally connected through a flange (1.5) and a flange (1.1).
Furthermore, the first interface (4.5) of the main shell (4) is connected with a combustion-supporting air port of the burner shell (7.4) through a connecting pipe (6) with an expansion joint.
The beneficial effects of the invention are:
when the device works, the W-shaped radiant tube (9), the burner nozzle shell (7.4) and the main shell (4) are installed on a heating device, before ignition, a valve on a combustion-supporting air pipeline is opened and adjusted according to air gas flow and proportion, when a controller receives an ignition command, the high-voltage bag is controlled to discharge to enable an ignition electrode (7.3) to be ignited, meanwhile, the valve on the gas pipeline is opened, gas is introduced into the burner nozzle (7) and is mixed with combustion-supporting air introduced into the burner nozzle (7) to burn, and stable and special-shaped flame is formed; combustion air enters the annular cavity of the capillary heat exchanger (2) through an air inlet pipe (2.6), then the gas enters the air pipe (3) through the inlet gas collection tank (2.10), the capillary heat exchange pipe (2.7) and the outlet gas collection tank (2.3) in sequence to realize the first heat exchange and temperature rise, then enters the inner bottom of the finned tube heat exchanger (8) along the air tube (3), the W-shaped radiant tube (9), the finned tube heat exchanger (8) and the air tube (3) form a double-layer circular seam, combustion air is sprayed to the inner bottom of the finned tube heat exchanger (8) from the air tube (3), then enters a smoke-isolating bin (4.4) through the circular seam of a finned tube heat exchanger (8) and an air tube to realize secondary heat exchange and temperature rise, then the flue gas is sprayed to a combustion-supporting air port of the burner shell (7.4) through a jet nozzle (5), and the jet nozzle (5) generates a Venturi effect, so that part of the flue gas is sucked and reflowed; flue gas that the burning produced passes through finned tube heat exchanger (8) along W type radiant tube (9), get into main casing body (4) through interface two (4.6) after the first heat transfer cooling, then some flue gas is through interface one (4.5) under venturi effect's suction effect, nozzle shell (7.4) backward flow to W type radiant tube (9), this part flue gas mixes the participation burning with the combustion air after preheating in nozzle (7), another part flue gas passes through interface three (4.1) and gets into capillary heat exchanger (2), accomplish the second heat transfer cooling behind the flue gas passageway of capillary heat exchanger (2), and through smoke collection case (1), the pipeline of discharging fume discharges.
According to the invention, flue gas is utilized to carry out heat exchange and temperature rise on two strokes of combustion air, in the capillary tube heat exchanger (2), the labyrinth type flue gas channel enables high-temperature flue gas to contact the capillary heat exchange tubes (2.7) as much as possible to form strong convection, so that the heat exchange efficiency is enhanced, in the finned tube heat exchanger (8), the W-shaped radiant tube (9), the finned tube heat exchanger (8) and the air tube (3) form double-layer circular seams, the combustion air and the flue gas are fully contacted with the finned tubes, the combustion air is further preheated, the effects of emission reduction and consumption reduction are achieved, the energy consumption can be improved by 8-12%, and the exhaust temperature is low.
The smoke partially reflows under the injection action of the combustion-supporting air and is mixed with the preheated combustion-supporting air to participate in combustion, so that the oxygen concentration is reduced, the local high temperature of flame is reduced, stable and uniform flame is formed under the condition of high furnace temperature, the generation of thermal NOx is reduced, the generation amount of NOx meets the domestic ultralow standard level, the smoke can be widely applied to the heating and heat treatment fields needing pulse combustion control and continuous adjustment, and the smoke is suitable for annealing furnaces, normalizing furnaces, heat treatment furnaces, quenching furnaces and continuous annealing furnaces.
The burner has a large power adjusting range, and burners (7) of different specifications can realize unequal heating capacity of 40-300 kw.
The combustor adopts a modular design, and is very simple and convenient to maintain and reform.
Drawings
Fig. 1 is a schematic diagram of a two-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner in an embodiment of the invention.
Fig. 2 is a schematic diagram of a capillary tube heat exchanger in an embodiment of the invention.
Figure 3 is a schematic view of a smoke collection box in an embodiment of the invention.
FIG. 4 is a schematic view of an air tube in an embodiment of the present invention.
FIG. 5 is a schematic view of a finned tube heat exchanger in an embodiment of the invention.
Fig. 6 is a schematic view of a main housing in an embodiment of the invention.
FIG. 7 is a schematic view of a burner in an embodiment of the invention.
Fig. 8 is a schematic view of a capillary heat exchange tube in an embodiment of the present invention.
In the figure:
1-a smoke collection box; 1.1-flange; 1.2-smoke collecting box main body; 1.3-branch pipe; 1.4-a valve; 1.5-flange;
2-a capillary tube heat exchanger; 2.1-flange; 2.2-cover plate; 2.3-outlet gas collection box; 2.4-cylinder two; 2.5-cylinder one; 2.6-air inlet duct; 2.7-capillary heat exchange tube; 2.8-cylinder three; 2.9-Cylinder four; 2.10-inlet gas collection tank; 2.11-flange;
3-an air pipe; 3.1-flange; 3.2-expansion joint; 3.3-air tube body;
4-a main housing; 4.1-interface three; 4.2-four-way shell; 4.3-casting material of the shell; 4.4-smoke isolating cabin; 4.5-interface one; 4.6-interface two;
5-a jet pipe;
6-connecting pipe;
7-a burner; 7.1-air distribution plate; 7.2-gas shower nozzle; 7.3-an ignition electrode; 7.4-burner shell; 7.5-end plate; 7.6-gas pipe;
8-finned tube heat exchanger; 8.1-connecting cylinder; 8.2-inner and outer finned tubes; 8.3-bulb;
9-W type radiant tube.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 to 8, a two-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner comprises a burner 7 mounted at one end of a W-shaped radiant tube 9 through a burner shell 7.4, a finned tube heat exchanger 8 positioned in the other end of the W-shaped radiant tube 9, a capillary tube heat exchanger 2 provided with four layers of cylinders, a main shell 4 provided with a smoke isolation bin 4.4 and three intercommunicating interfaces, a smoke collection box 1 and an air tube 3; in the capillary tube heat exchanger 2, a cylinder I2.5 to a cylinder II 2.9 are sequentially arranged from outside to inside, the cylinder I2.5 and the cylinder II 2.4 form a closed annular cavity, the side part and one end of the annular cavity are respectively communicated with an air inlet pipe 2.6 and an inlet gas collecting box 2.10, a capillary heat exchange tube 2.7 is distributed between a cylinder III 2.8 and the cylinder IV 2.9, the two ends of the capillary heat exchange tube are respectively communicated with the inlet gas collecting box 2.10 and an outlet gas collecting box 2.3 in a sealing manner, the two ends of the capillary heat exchange tube are respectively communicated with the inlet gas collecting box 2.10 and the outlet gas collecting box 2.3 in a sealing manner, the cylinder IV 2.9, the cylinder III 2.8 and the cylinder II 2.4 form a labyrinth type flue gas channel, the outlet of the flue gas channel is connected with a flue gas collecting box 1, and the flue gas collecting box 1 and the air inlet pipe 2.6 are respectively externally connected with a smoke exhaust pipeline and a combustion-supporting air pipeline; in the main shell 4, a first interface 4.5, a second interface 4.6 and a third interface 4.1 are respectively communicated with a combustion-supporting air port of a burner shell 7.4, the other end of a W-shaped radiant tube 9 and a flue gas channel inlet of the capillary tube heat exchanger 2 in a butt joint mode, the side portion of the smoke isolating bin 4.4 is in butt joint with an injection spray tube 5, one end of the smoke isolating bin is in butt joint with a finned tube heat exchanger 8, the injection spray tube 5 is located at the first interface 4.5, one end of an air tube 3 penetrates into the smoke isolating bin 4.4 in a sealing mode and then extends into the finned tube heat exchanger 8 to the bottom, and the other end of the air tube penetrates through the third interface 4.1 and then extends into a fourth tube body 2.9 to be communicated with an outlet gas collecting box 2.3.
As shown in fig. 1, in this embodiment, the first interface 4.5 of the main casing 4 is connected to the combustion-supporting tuyere of the burner casing 7.4 through the connecting pipe 6 with the expansion joint, so as to avoid cracking due to inconsistent thermal expansion.
As shown in fig. 2, in the capillary heat exchanger 2 of the present embodiment, two ends of a cylinder one 2.5 are respectively provided with a flange 2.1 and a flange 2.11, the flange 2.1 and the flange 2.11 are respectively abutted to a smoke collection box 1 and a connector three 4.1, two ends of a cylinder two 2.4 are respectively installed on the flange 2.1 and an inlet gas collection box 2.10, one end of a ring cavity is blocked by the flange 2.1, the other end is blocked by the inlet gas collection box 2.10 but a communication hole is left, two ends of a cylinder three 2.8 and a cylinder four 2.9 are respectively installed on the inlet gas collection box 2.10 and an outlet gas collection box 2.3, a portion of the cylinder four 2.9 close to the inlet gas collection box 2.10 is provided with a communication hole, a portion of the cylinder three 2.8 close to the outlet gas collection box 2.3 is provided with a communication hole abutted to an air pipe 3, and the other side of the outlet box 2.3 is blocked by a cover plate 2.2.
As shown in fig. 3, in the present embodiment, in the smoke collecting box 1, the smoke collecting box main body 1.2 is a frustum shape with a wide front and a narrow back, the side of the smoke collecting box main body 1.2 is connected with the branch pipe 1.3 of the valve 1.4, and the front end and the back end of the smoke collecting box main body 1.2 are respectively circumscribed by the flange 1.5 and the flange 1.1.
In the present exemplary embodiment, as shown in fig. 4, in the air line 3, the air line body 3.3 is L-shaped, and the part of the air line body 3.3 in the capillary heat exchanger 2 is provided with an expansion joint 3.2 and communicates with the outlet header tank 2.3 via a flange 3.1. One end of the air pipe 3 is free, and the other end is provided with an expansion joint 3.2, so that the short service life caused by inconsistent thermal expansion amount is avoided.
As shown in fig. 5, in the present embodiment, the finned tube heat exchanger 8 is cylindrical and includes a connecting cylinder 8.1, inner and outer finned tubes 8.2 and a bulb 8.3, which are welded in sequence.
As shown in fig. 6, in this embodiment, the main body structure of the main housing 4 is a four-way housing 4.2 and a housing castable 4.3, wherein the three-way corresponds to the first connector 4.5, the second connector 4.6 and the third connector 4.1, respectively, the remaining one is used for installing the smoke separation bin 4.4, and after the smoke separation bin 4.4 is installed, the sealing plate is installed to simultaneously seal one end of the smoke separation bin 4.4 and the remaining one.
As shown in fig. 7, in the burner 7 of the present embodiment, the ignition electrode 7.3 and the gas pipe 7.6 both penetrate through the burner housing 7.4 and extend into the W-shaped radiant tube 9, the ignition electrode 7.3 and the gas pipe 7.6 are mounted on the burner housing 7.4 through the end plate 7.5, the end plate 7.5 plugs the burner housing 7.4, the outer end of the gas pipe 7.6 is externally connected with the gas pipeline, the inner end is mounted with the gas nozzle 7.2, the gas nozzle 7.2 is mounted with the air distribution plate 7.1, the outer end of the ignition electrode 7.3 is externally connected with the high pressure bag, the inner end extends into the air distribution plate 7.1, and forms a certain angle and distance with the nozzle of the gas nozzle 7.2.
As shown in fig. 8, in the present embodiment, the capillary heat exchange tube 2.7 is flat, and expansion portions are distributed along the capillary heat exchange tube, and the capillary heat exchange tube changes from a circular shape to a flat shape, so as to increase the contact area of the combustion air and reduce the preheating temperature gradient of the combustion air, and the expansion amount is remained, thereby avoiding cracking caused by temperature difference.
In this embodiment, the connecting cylinder 8.1 is made of 0Cr25Ni20, the inner and outer finned tubes 8.2 and the bulb 8.3 are made of 0Cr28Ni48W5, and the connecting cylinder is not oxidized at 1180 ℃ in a normal use, and is continuously used at 1250 ℃ and the highest temperature of 1350 ℃. In this embodiment, the capillary heat exchange tube 2.7 is made of 0Cr25Ni20 by extrusion molding. In this embodiment, the air tube 3 is located between 20 and 40mm from the bottom of the finned tube heat exchanger 8. In the present embodiment, there are 100 capillary heat exchange tubes 2.7.
When the burner works, the W-shaped radiant tube 9, the burner shell 7.4 and the main shell 4 are installed on heating equipment, before ignition, a valve on a combustion-supporting air pipeline is opened and adjusted according to the air gas flow and the proportion, when a controller receives an ignition command, the high-voltage bag is controlled to discharge to ignite an ignition electrode 7.3, and meanwhile, the valve on the gas pipeline is opened, so that gas is introduced into the burner 7 and is mixed and combusted with combustion-supporting air previously introduced into the burner 7 to form stable flame with a specific shape; combustion-supporting air enters an annular cavity of the capillary tube heat exchanger 2 through an air inlet pipe 2.6, then sequentially passes through an inlet gas collecting tank 2.10, a capillary heat exchange pipe 2.7 and an outlet gas collecting tank 2.3 to enter an air pipe 3, primary heat exchange and temperature rise are realized, then the combustion-supporting air enters the inner bottom of the finned tube heat exchanger 8 along the air pipe 3, a W-shaped radiant tube 9, the finned tube heat exchanger 8 and the air pipe 3 form a double-layer annular seam, the combustion-supporting air is sprayed to the inner bottom of the finned tube heat exchanger 8 from the air pipe 3, and then the combustion-supporting air enters a smoke separation bin 4.4 through the annular seam of the finned tube heat exchanger 8 and the air pipe to realize secondary heat exchange and temperature rise, and then the combustion-supporting air is sprayed to a combustion-supporting air port of a burner shell 7.4 through an injection nozzle 5, and the injection nozzle 5 generates a Venturi effect, so that part of smoke is sucked and refluxed; flue gas generated by combustion passes through the finned tube heat exchanger 8 along the W-shaped radiant tube 9, enters the main shell 4 through the interface II 4.6 after first heat exchange and temperature reduction, then a part of flue gas flows back to the W-shaped radiant tube 9 through the interface I4.5 and the nozzle shell 7.4 under the suction action of Venturi effect, the part of flue gas is mixed with preheated combustion-supporting air in the nozzle 7 to participate in combustion, the other part of flue gas enters the capillary tube heat exchanger 2 through the interface III 4.1, second heat exchange and temperature reduction are completed after the flue gas passes through the flue gas channel of the capillary tube heat exchanger 2, and the flue gas is discharged through the smoke collection box 1 and the smoke exhaust pipeline.
According to the invention, flue gas is utilized to carry out heat exchange and temperature rise on two strokes of combustion air, in the capillary tube heat exchanger 2, the labyrinth type flue gas channel enables high-temperature flue gas to contact with the capillary heat exchange tube 2.7 as much as possible to form strong convection, so that the heat exchange efficiency is enhanced, in the finned tube heat exchanger 8, the W-shaped radiant tube 9, the finned tube heat exchanger 8 and the air tube 3 form a double-layer circular seam, the combustion air and the flue gas are fully contacted with the finned tube, the combustion air is further preheated, the emission reduction and consumption reduction effects are achieved, the energy consumption can be improved by 8-12%, and the exhaust temperature is low.
The smoke partially reflows under the injection action of the combustion-supporting air and is mixed with the preheated combustion-supporting air to participate in combustion, so that the oxygen concentration is reduced, the local high temperature of flame is reduced, stable and uniform flame is formed under the condition of high furnace temperature, the generation of thermal NOx is reduced, the generation amount of NOx meets the domestic ultralow standard level, the smoke can be widely applied to the heating and heat treatment fields needing pulse combustion control and continuous adjustment, and the smoke is suitable for annealing furnaces, normalizing furnaces, heat treatment furnaces, quenching furnaces and continuous annealing furnaces.
The combustor adopts a modular design, and is very simple and convenient to maintain and reform.
The burner has a large power adjusting range, and the burners 7 with different specifications can realize different heating capacities of 40-300 kw.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a two stroke heat transfer flue gas backward flow high energy efficiency W type radiant tube combustor which characterized in that: the device comprises a burner (7) arranged at one end of a W-shaped radiant tube (9) through a burner shell (7.4), a finned tube heat exchanger (8) positioned in the other end of the W-shaped radiant tube (9), a capillary tube heat exchanger (2) provided with four layers of cylinders, a main shell (4) provided with a smoke isolating bin (4.4) and three intercommunicating interfaces, a smoke collecting box (1) and an air tube (3); in the capillary tube heat exchanger (2), a first cylinder (2.5) to a fourth cylinder (2.9) are sequentially arranged from outside to inside, the first cylinder (2.5) and the second cylinder (2.4) form a closed annular cavity, the side part and one end of the annular cavity are respectively communicated with an air inlet pipe (2.6) and an inlet gas collecting box (2.10), capillary heat exchange tubes (2.7) are distributed between the third cylinder (2.8) and the fourth cylinder (2.9), two ends of the capillary heat exchange tubes are respectively sealed and communicated with the inlet gas collecting box (2.10) and an outlet gas collecting box (2.3), the fourth cylinder (2.9), the third cylinder (2.8) and the second cylinder (2.4) form a labyrinth type flue gas channel, the outlet of the flue gas channel is connected with a flue gas collecting box (1), and the flue gas collecting box (1) and the air inlet pipe (2.6) are respectively and externally connected with a smoke exhaust pipeline and a combustion-supporting air pipeline; in the main shell (4), a first connector (4.5), a second connector (4.6) and a third connector (4.1) are respectively communicated with a combustion-supporting air port of the burner shell (7.4), the other end of the W-shaped radiant tube (9) and a flue gas channel inlet of the capillary tube heat exchanger (2) in a butt joint mode, the side portion of the smoke isolating bin (4.4) is in butt joint with the ejector spray pipe (5), one end of the smoke isolating bin is in butt joint with the finned tube heat exchanger (8), the ejector spray pipe (5) is located at the first connector (4.5), one end of the air tube (3) penetrates the smoke isolating bin (4.4) in a sealing mode and then extends into the finned tube heat exchanger (8) to the bottom, and the other end of the air tube penetrates through the third connector (4.1) and then extends into a fourth barrel (2.9) to be communicated with the outlet gas collecting box (2.3).
2. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: in a capillary heat exchanger (2), two ends of a cylinder I (2.5) are respectively provided with a flange (2.1) and a flange (2.11), the flange (2.1) and the flange (2.11) are respectively butted with a smoke collecting box (1) and a connector III (4.1), two ends of a cylinder II (2.4) are arranged on the flange (2.1) and an inlet gas collecting box (2.10), one end of a ring cavity is blocked by the flange (2.1), the other end of the ring cavity is blocked by the inlet gas collecting box (2.10) but is provided with a communicating hole, two ends of a cylinder III (2.8) and a cylinder IV (2.9) are respectively arranged on the inlet gas collecting box (2.10) and an outlet gas collecting box (2.3), the part of the cylinder IV (2.9) close to the inlet gas collecting box (2.10) is provided with a communicating hole, the part of the cylinder III (2.8) close to the outlet gas collecting box (2.3) is provided with a communicating hole, one side of the outlet box (2.3) is provided with a communicating hole butted with a gas collecting hole butted with an air pipe (3), the other side is sealed by a cover plate (2.2).
3. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-type radiant tube burner as claimed in claim 1 or 2, characterized in that: the capillary heat exchange tube (2.7) is flat and expansion parts are distributed along the line.
4. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: the major structure of main casing body (4) is cross casing (4.2) and casing pouring material (4.3), and wherein, the tee bend corresponds interface one (4.5), interface two (4.6) and interface three (4.1) respectively, and remaining one is general to be used for installing smoke-proof storehouse (4.4), installs the shrouding again after smoke-proof storehouse (4.4) installation and will separate cigarette storehouse (4.4) one end and remaining one to block simultaneously.
5. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: in the burner (7), an ignition electrode (7.3) and a gas pipe (7.6) both penetrate through a burner shell (7.4) and extend into a W-shaped radiant tube (9), the ignition electrode (7.3) and the gas pipe (7.6) are installed on the burner shell (7.4) through an end plate (7.5), the burner shell (7.4) is plugged by the end plate (7.5), the outer end of the gas pipe (7.6) is externally connected with a gas pipeline, the inner end of the gas pipe is provided with a gas nozzle (7.2), an air distribution disc (7.1) is installed on the gas nozzle (7.2), the outer end of the ignition electrode (7.3) is externally connected with a high-pressure bag, and the inner end of the ignition electrode extends into the air distribution disc (7.1) and forms a certain angle and distance with a gas nozzle hole (7.2).
6. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: in the air pipe (3), an air pipe main body (3.3) is L-shaped, and the part of the air pipe main body (3.3) in the capillary heat exchanger (2) is provided with an expansion joint (3.2) and is communicated with an outlet gas collecting box (2.3) through a flange (3.1).
7. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: the finned tube heat exchanger (8) is cylindrical and comprises a connecting cylinder (8.1), an inner finned tube, an outer finned tube (8.2) and a ball head (8.3) which are welded in sequence.
8. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: in the smoke collection box (1), a smoke collection box main body (1.2) is in a frustum shape with a wide front part and a narrow back part, the side part of the smoke collection box main body (1.2) is connected with a branch pipe (1.3) of a valve (1.4), and the front end and the back end of the smoke collection box main body (1.2) are respectively connected with the outside through a flange (1.5) and a flange (1.1).
9. The two-stroke heat exchange flue gas recirculation high-energy-efficiency W-shaped radiant tube burner as claimed in claim 1, characterized in that: the first interface (4.5) of the main shell (4) is connected with a combustion-supporting air port of the burner shell (7.4) through a connecting pipe (6) with an expansion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269964.0A CN114777119A (en) | 2022-03-18 | 2022-03-18 | Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210269964.0A CN114777119A (en) | 2022-03-18 | 2022-03-18 | Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114777119A true CN114777119A (en) | 2022-07-22 |
Family
ID=82426150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210269964.0A Pending CN114777119A (en) | 2022-03-18 | 2022-03-18 | Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114777119A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307143A (en) * | 2022-07-26 | 2022-11-08 | 中冶南方（武汉）热工有限公司 | I-shaped self-preheating burner with special-shaped tube type ceramic stud double-stroke heat exchanger |
-
2022
- 2022-03-18 CN CN202210269964.0A patent/CN114777119A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307143A (en) * | 2022-07-26 | 2022-11-08 | 中冶南方（武汉）热工有限公司 | I-shaped self-preheating burner with special-shaped tube type ceramic stud double-stroke heat exchanger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207035119U (en) | Direct-injection type low-NOx self-preheating burner | |
| CN105674268B (en) | energy-saving gas burner | |
| CN204678328U (en) | combustion powder industrial boiler | |
| CN106196058A (en) | Ultralow NOx flame burning technology heat-accumulating burner | |
| CN110806005A (en) | Environment-friendly staged combustion boiler | |
| CN207035120U (en) | A kind of special low NOx burner of stainless steel annealing stove | |
| CN114777119A (en) | Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner | |
| CN105020703B (en) | A kind of burner | |
| CN201547782U (en) | A side-burning high-temperature preheating air forced draft burner for a reforming square box furnace | |
| CN212688112U (en) | High-air-temperature hot blast stove with ultralow nitrogen oxide emission | |
| CN217302787U (en) | Double-stroke heat exchange flue gas backflow high-energy-efficiency W-shaped radiant tube burner | |
| CN109737402B (en) | U-shaped flame low-nitrogen oxide burner for high-temperature hearth | |
| CN216769413U (en) | W-shaped radiant tube burner with low nitrogen oxide and flue gas backflow function | |
| CN217635618U (en) | High-temperature flue gas backflow high-energy-efficiency radiant tube burner in tubular double-three-pass heat exchanger | |
| CN216203299U (en) | Pulverized coal furnace high-temperature flue gas extraction system for adjacent furnace ignition and self-stabilizing combustion | |
| CN117212761A (en) | Gas and water mixed combustion steam boiler | |
| CN112856408B (en) | W-type radiant tube burner with coal gas grading and premixed combustion | |
| CN2527867Y (en) | Oil-less direct ignition burner for coal powder-fired boiler | |
| CN217978803U (en) | I-shaped self-preheating burner with special-shaped tube type finned tube double-stroke heat exchanger | |
| CN205957173U (en) | Ultralow NOx flame combustion technology regenerative burner | |
| CN104033902A (en) | High-power heat exchange burner for industry kiln stove | |
| CN108980831A (en) | A kind of ultralow NOxHeat-accumulating burner | |
| CN116481022B (en) | Water-cooled oil ignition device of circulating fluidized bed boiler | |
| CN220229249U (en) | Combustion system of heating furnace gas | |
| CN220870865U (en) | Multistage tubular low NOx self-preheating burner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |