CN115406100B - Indirect heat exchange type hot blast stove - Google Patents
Indirect heat exchange type hot blast stove Download PDFInfo
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- CN115406100B CN115406100B CN202211076761.6A CN202211076761A CN115406100B CN 115406100 B CN115406100 B CN 115406100B CN 202211076761 A CN202211076761 A CN 202211076761A CN 115406100 B CN115406100 B CN 115406100B
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- air
- hot blast
- blast stove
- combustion chamber
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 49
- 239000000779 smoke Substances 0.000 claims abstract description 47
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011229 interlayer Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 230000002950 deficient Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 11
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention relates to an indirect heat exchange type hot blast stove, and belongs to the technical field of hot blast stoves. The indirect heat exchange type hot blast stove comprises a hot blast stove frame and a hot blast stove core body, wherein the hot blast stove core body is arranged in the hot blast stove frame; the hot air furnace core body comprises a combustion chamber, a turning air duct, an outer cylinder body, a plate heat exchanger and a smoke exhaust bellows, wherein one end of the combustion chamber is provided with a burner, and an interlayer between the combustion chamber and the turning air duct and the outer cylinder body is a first air channel; the muzzle of the burner is coaxially provided with a smoke mixer and a fairing, and the upper end of the smoke discharging bellows is communicated with the smoke mixer. In the invention, the flame root formed by the burner is arranged in the fairing, and the backflow flue gas enters from the air leakage through hole of the fairing, so that the temperature of the flame surface in the first circular cone part of the fairing is rapidly reduced, partial oxygen-deficient combustion is formed, and the generation of NOx is reduced; and due to entrainment effect formed at the first circular cone portion, local flue gas recirculation reduces NOx generation.
Description
Technical Field
The invention relates to an indirect heat exchange type hot blast stove, and belongs to the technical field of hot blast stoves.
Background
The hot blast stove is a thermal power machine, is widely applied in China at the end of the 70 th century, and is an updated product of an electric heat source and a traditional steam power heat source in a plurality of industries. The hot blast stove is divided into a direct type hot blast stove and an indirect type hot blast stove, and the indirect type hot blast stove is mainly suitable for the working condition that the flue gas is not allowed to directly contact with dry materials. The working principle of the indirect heat exchange type hot blast stove is that the heat of fuel combustion is exchanged to fresh air through a heat exchanger, the air is not contacted with flue gas in the process, and the heated air is utilized to dry materials, so that the indirect heat exchange type hot blast stove is widely applied to the fields of food, medicine, glass fiber, fine chemical industry and the like.
The gas hot blast stove is one of indirect hot blast stoves, NOx is one of main pollutants of the gas hot blast stove, acid rain and acid mist are easy to form when the gas hot blast stove is discharged into the atmosphere, and the gas hot blast stove is harmful to the environment and human bodies, so that the pollutant emission standard implemented in China is more and more strict. The boiler atmospheric pollutant emission standard is specified by referring to the latest national standard GB 13271-2012: NOx emission of newly built gas boiler cannot exceed 200mg/m 3 (100 ppm), with a focus of no more than 150mg/m 3 (75 ppm). With the rise of the requirements of national environmental protection on NOx emission, the national environmental protection has come out from the market in a plurality of provinces at present as a local boiler standard, and the emission of nitrogen oxides is required to be not more than 30mg in Beijing, zhengzhou and the like.
The NOx generated by natural gas combustion is mainly thermal NOx and rapid NOx. The formation of thermal NOx is mainly affected by temperature, oxygen volume fraction and residence time in the high temperature zone, and the formation of rapid NOx is mainly affected by fuel concentration and oxygen volume fraction. In order to achieve the emission standard of the pollutants, a low-nitrogen combustor is usually adopted, and although the low-nitrogen combustor is the most effective mode for reducing the NOx emission of the gas hot blast stove at present, the hearth structure of the hot blast stove is also important for reducing the NOx emission of the gas hot blast stove. Therefore, how to improve the hearth structure of the hot blast stove to further reduce the NOx emission of the gas hot blast stove is a technical problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problem of providing an indirect heat exchange type hot blast stove aiming at the defects of the prior art.
The technical scheme provided by the invention for solving the technical problems is as follows: an indirect heat exchange type hot blast stove comprises a hot blast stove frame and a hot blast stove core body, wherein the hot blast stove core body is arranged in the hot blast stove frame;
the hot air furnace core comprises a combustion chamber, a turning air flue, an outer cylinder, a plate heat exchanger and a smoke exhaust bellows, wherein the combustion chamber is horizontally arranged at the middle upper part in a hot air furnace frame, one end of the combustion chamber is provided with a burner, the turning air flue is vertically arranged, the other end of the combustion chamber is communicated with the upper end of the turning air flue, the plate heat exchanger is horizontally arranged at the middle lower part in the hot air furnace frame, one side of the plate heat exchanger is provided with a hot side inlet, the hot side inlet is communicated with the lower end of the turning air flue, the other side of the plate heat exchanger is provided with a hot side outlet, the smoke exhaust bellows is arranged close to the hot side outlet, the hot side outlet is communicated with the smoke exhaust bellows, the smoke exhaust bellows is communicated with a smoke exhaust fan; the combustion chamber and the turning air duct are arranged in the outer cylinder body, an interlayer between the combustion chamber and the turning air duct and the outer cylinder body is arranged as a first air channel, the lower end of the first air channel is communicated with a cold side outlet of the plate heat exchanger, one side, close to the burner, of the upper end of the first air channel is communicated with an air outlet, and a cold side inlet of the plate heat exchanger is communicated with an air inlet;
the burner comprises a burner body, a burner and a gas turbine, wherein a gas mixing device and a fairing are coaxially arranged at the muzzle of the burner, the gas mixing device comprises an outer ring barrel and an inner ring barrel which are coaxially arranged, and air leakage through holes are uniformly distributed on the inner ring barrel; the fairing comprises a first circular cone part and a second circular cone part which are manufactured into a whole, and the first circular cone part of the fairing is arranged close to the burner and is uniformly provided with air leakage through holes; the upper end of the smoke discharging bellows is communicated with the smoke mixing device.
The improvement of the technical scheme is as follows: cyclone distribution plates are uniformly distributed on the outer side wall of the junction of the first circular cone part and the second circular cone part of the fairing along the circumferential direction.
The improvement of the technical scheme is as follows: the middle part of the combustion chamber is provided with an expansion corrugated cylinder.
The improvement of the technical scheme is as follows: spiral wind guide ribs are uniformly arranged on the outer wall of one side of the combustion chamber close to the turning air duct at intervals.
The improvement of the technical scheme is as follows: triangular pressing grooves are formed in the outer cylinder body at intervals.
The improvement of the technical scheme is as follows: the end of the burner, which is far away from the combustion chamber, extends out of the hot blast stove frame and is provided with a combustion air inlet.
The improvement of the technical scheme is as follows: a plurality of heat exchange plates which are mutually overlapped are arranged in the plate type heat exchanger, one surface of each heat exchange plate is provided with a large salient point, the other surface of each heat exchange plate is provided with a small salient point, one surfaces of two adjacent heat exchange plates provided with large salient points are mutually close to each other, the large salient points are mutually abutted to form a second air channel, and two ends of the second air channel are respectively communicated with the cold side inlet and the cold side outlet; one surfaces of two adjacent heat exchange plates, which are provided with small protruding points, are mutually close to each other, the small protruding points are mutually abutted to form a smoke channel, and two ends of the smoke channel are respectively communicated with the hot side inlet and the hot side outlet.
The improvement of the technical scheme is as follows: a limiting plate is arranged between the outer ring cylinder and the inner ring cylinder of the flue gas mixer.
The improvement of the technical scheme is as follows: the temperature measuring tube is characterized by further comprising a temperature measuring tube, one end of the temperature measuring tube stretches into the outer cylinder and is abutted against the outer side wall of the turning air duct, and a temperature probe is arranged in the temperature measuring tube.
The improvement of the technical scheme is as follows: the gap between the hot blast stove frame and the hot blast stove core body is filled with a heat preservation layer.
The beneficial effects of the technical scheme adopted by the invention are as follows:
(1) In the indirect heat exchange type hot blast stove, the flame root formed by the burner is arranged in the fairing, and the backflow flue gas enters from the air leakage through hole of the fairing, so that the temperature of the flame surface in the first circular cone part of the fairing is rapidly reduced, partial oxygen-deficient combustion is formed, and the generation of NOx is reduced; the second circular cone part of the fairing is high in flue gas speed formed by combustion, part of the backflow flue gas wraps the outer side of the first circular cone part of the fairing through the cyclone distribution plate, and the backflow flue gas at the outer side of the first circular cone part is low in wind speed, so that entrainment effect is formed at the first circular cone part, partial flue gas is recycled, NOx generation is reduced, and compared with the conventional combustor, the device is directly combusted in a combustion chamber, and NOx generation can be reduced by more than 30%;
(2) In the indirect heat exchange type hot blast stove, the middle part of the combustion chamber is provided with the expansion corrugated cylinder, so that the heat transfer area is increased, the radiation heat transfer intensity is high, and the air can be heated to 580 ℃ at most;
(3) In the indirect heat exchange type hot blast stove, the air ring surrounds the combustion chamber with the expansion corrugated cylinder by the air guiding function of the air guiding ribs, and high-temperature flue gas transmits heat to the air by radiation, so that no high Wen Sijiao is generated by heating, the heat transfer area is increased, and the heat exchange efficiency of a hearth is improved;
(4) In the indirect heat exchange type hot blast stove, the outer cylinder body is uniformly provided with the triangular pressing grooves at intervals, the outer cylinder body can resist pressure of 50Kpa due to the arrangement of the triangular pressing grooves, and meanwhile, the outer cylinder body cannot crack due to high temperature and high pressure;
(5) In the indirect heat exchange type hot blast stove, one surface of a heat exchange plate in the plate heat exchanger is provided with a large salient point, the other surface of the heat exchange plate is provided with a small salient point, the large salient point is self-supported to form a second air channel, the small salient point is self-supported to form a flue gas channel, the heated air quantity is far greater than the flue gas quantity, the air side channel spacing is greater than the flue gas side channel spacing, the wind resistance is small, the heat exchange efficiency is high, the flue gas exhaust temperature of the hot blast stove is reduced to below 60 ℃, and the total heat efficiency can reach 95%;
(6) In the indirect heat exchange type hot blast stove, the heat insulation layer is filled in the gap between the hot blast stove frame and the hot blast stove core body, so that the temperature of the outer wall of the hot blast stove frame is less than 60 ℃, high-temperature scalding is prevented, heat dissipation in the stove is reduced to the environment, and the heat efficiency of the hot blast stove is improved.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of an indirect heat exchange type hot blast stove according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fairing of an indirect heat exchange stove according to an embodiment of the invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a schematic diagram of a left-side view structure of a flue gas mixer of the indirect heat exchange type hot blast stove according to the embodiment of the invention;
FIG. 5 is a schematic view of a heat exchange plate of an indirect heat exchange type hot blast stove according to an embodiment of the present invention, which is provided with a large bump;
FIG. 6 is a schematic view of a heat exchange plate of an indirect heat exchange type hot blast stove according to an embodiment of the present invention, which is provided with a small salient point;
FIG. 7 is a partial cross-sectional view of a heat exchanger plate of an indirect heat exchange stove according to an embodiment of the invention;
wherein: 1-burner, 1.1-combustion air inlet, 2-flue gas mixer, 2.1-outer cylinder, 2.2-inner cylinder, 2.3-limiting plate, 3-fairing, 3.1-first circular cone section, 3.2-second circular cone section, 4-cyclone distribution plate, 5-air outlet, 6-combustion chamber, 7-expansion bellows, 8-outer cylinder, 8.1-triangular indent, 9-wind guiding rib, 10-first air channel, 11-corner wind channel, 12-temperature measuring tube, 13-plate heat exchanger, 13.1-heat exchanging plate, 13.2-big bump, 13.3-small bump, 13.4-flue gas channel, 13.5-second air channel, 14-hot blast stove frame, 15-air inlet, 16-heat preservation, 17-smoke exhausting fan, 18-smoke outlet, 19-bellows.
Detailed Description
Examples
The indirect heat exchange type hot blast stove of the embodiment, as shown in figures 1-7, comprises a hot blast stove frame 14 and a hot blast stove core body, wherein the hot blast stove core body is arranged in the hot blast stove frame 14;
the hot air furnace core comprises a combustion chamber 6, a turning air flue 11, an outer cylinder 8, a plate heat exchanger 13 and a smoke exhaust wind box 19, wherein the combustion chamber 6 is horizontally arranged at the middle upper part in a hot air furnace frame 14, one end of the combustion chamber 6 is provided with a burner 1, the turning air flue 11 is vertically arranged, the other end of the combustion chamber 6 is communicated with the upper end of the turning air flue 11, the plate heat exchanger 13 is horizontally arranged at the middle lower part in the hot air furnace frame 14, one side of the plate heat exchanger 13 is provided with a hot side inlet, the hot side inlet is communicated with the lower end of the turning air flue 11, the other side of the plate heat exchanger 13 is provided with a hot side outlet, the smoke exhaust wind box 19 is arranged close to the hot side outlet, the hot side outlet is communicated with the smoke exhaust wind box 19, the smoke exhaust wind box 19 is communicated with a smoke exhaust 18, and the smoke exhaust wind box 19 is provided with a smoke exhaust fan 17; the combustion chamber 6 and the turning air duct 11 are arranged in the outer cylinder 8, an interlayer between the combustion chamber 6 and the turning air duct 11 and the outer cylinder 8 is arranged as a first air channel 10, the lower end of the first air channel 10 is communicated with a cold side outlet of the plate heat exchanger 13, one side, close to the combustor 1, of the upper end of the first air channel 10 is communicated with an air outlet 5, and a cold side inlet of the plate heat exchanger 13 is communicated with an air inlet 15; the air outlet 5 is arranged at the upper end of the hot blast stove frame 14, the air inlet 15 is arranged at the lower end of the hot blast stove frame 14, and the smoke outlet 18 is arranged at the middle lower part of the front side surface of the hot blast stove frame 14.
The gas-liquid burner comprises a burner 1, wherein a gas-liquid mixer 2 and a fairing 3 are coaxially arranged at the muzzle of the burner, the gas-liquid mixer 2 comprises an outer ring barrel 2.1 and an inner ring barrel 2.2 which are coaxially arranged, and air leakage through holes are uniformly distributed in the inner ring barrel 2.2; the fairing 3 comprises a first circular cone part 3.1 and a second circular cone part 3.2 which are manufactured into a whole, and the first circular cone part 3.1 of the fairing 3 is arranged close to the burner 1 and is uniformly provided with air leakage through holes; the upper end of the smoke discharging bellows 19 is communicated with the smoke mixer 2. The end of the burner 1 remote from the combustion chamber 6 extends beyond the stove frame 14 and is provided with a combustion air inlet 1.1. Limiting plates 2.3 are uniformly arranged between the outer ring barrel 2.1 and the inner ring barrel 2.1 of the flue gas mixer 2 at intervals along the circumferential direction. The arrow direction in fig. 4 is the direction of the return flue gas flow.
In the indirect heat exchange type hot blast stove of the embodiment, as shown in fig. 2 and 3, cyclone distribution plates 4 are uniformly distributed on the outer side wall of the junction of the first circular cone portion 3.1 and the second circular cone portion 3.2 of the fairing 3 along the circumferential direction.
In the indirect heat exchange type hot blast stove of the embodiment, the middle part of the combustion chamber 6 is provided with an expansion bellows 7. The outer wall of the combustion chamber 6, which is close to one side of the turning air duct 11, is uniformly provided with spiral air guide ribs 9 at intervals. The outer cylinder 8 is provided with triangular pressing grooves 8.1 at intervals.
In the indirect heat exchange type hot blast stove of the embodiment, as shown in fig. 5-7, a plurality of heat exchange plates 13.1 which are mutually overlapped are arranged in a plate heat exchanger 13, one surface of each heat exchange plate 13.1 is provided with a large convex point 13.2, the other surface of each heat exchange plate 13.1 is provided with a small convex point 13.3, one surfaces of two adjacent heat exchange plates 13.1 provided with large convex points 13.2 are mutually close to each other, the large convex points 13.2 are mutually abutted to form a second air channel 13.5, and two ends of the second air channel 13.5 are respectively communicated with a cold side inlet and a cold side outlet; one surface of each two adjacent heat exchange plates 13.1 provided with small protruding points 13.3 is arranged close to each other, the small protruding points 13.3 are mutually abutted to form a flue gas channel 13.4, and two ends of the flue gas channel 13.4 are respectively communicated with the hot side inlet and the hot side outlet.
The indirect heat exchange type hot blast stove of the embodiment, as shown in fig. 1, further comprises a temperature measuring tube 12, wherein one end of the temperature measuring tube 12 extends into the outer cylinder 8 and is abutted with the outer side wall of the turning air duct 11, and a temperature probe is arranged in the temperature measuring tube 12. The gap between the hot blast stove frame 14 and the hot blast stove core is filled with a heat insulating layer 16.
In the indirect heat exchange type hot blast stove of the embodiment, the heat preservation layer 16 can be made of aluminum silicate fiber cotton, and the heat preservation layer 16 can also be made of rock cotton. The turning air duct 11 is an integral mould pressing expansion cylinder and can resist the temperature of 800 ℃. The smoke exhaust fan 17 is inserted into the smoke exhaust air box 19, the smoke exhaust air box 19 is of a three-way structure, the spiral case of the smoke exhaust fan is saved, the structure is compact, the material consumption is low, and the purchasing cost of the fan can be reduced by 40%.
The working principle of the indirect heat exchange type hot blast stove of the embodiment is as follows: the smoke outlet 18 is connected with an electric regulating valve and then is communicated with a chimney, the combustor 1 is inserted into the smoke mixer 2 in the furnace body, the formed flame root is rectified, in the 3, the backflow smoke enters through the air leakage through hole of the fairing 3, the temperature of the flame surface in the first circular cone portion 3.1 of the fairing 3 is rapidly reduced, partial oxygen-deficient combustion is formed, the generation of NOx is reduced, meanwhile, the speed of smoke formed by combustion in the second circular cone portion 3.2 of the fairing 3 is high, part of backflow smoke wraps the outer side of the first circular cone portion 3.1 of the fairing 3 through the cyclone distribution plate 4, and due to the fact that the speed of the backflow smoke outside the first circular cone portion 3.1 is low, a entrainment effect is formed at the position of the first circular cone portion 3.1, partial smoke is recycled, and the generation of NOx is reduced. Heated air enters the plate heat exchanger 13 from the air inlet 15, after convection heat transfer and gradual rise of air temperature, the heated air enters the first air channel 10, and under the action of the air guide fins 9, the heated air surrounds the combustion chamber 6 with the expansion corrugated cylinder 7, heat is transferred to the air by high-temperature flue gas through radiation, and the hot air enters a hot air demand process from the air outlet 5. Meanwhile, after the high-temperature flue gas is cooled by the combustion chamber 6 and the plate heat exchanger 13, the high-temperature flue gas is pumped into the flue gas exhaust wind box 19 by the flue gas exhaust fan 17, the top of the flue gas exhaust wind box 19 is connected with the flue gas mixer 2, the side surface of the flue gas exhaust wind box is provided with a flue gas outlet 18 which is connected with an electric regulating valve, part of the flue gas is controlled to enter the flue gas mixer 2 (the reflux quantity is less than or equal to 20 percent) through the valve regulation, the combustion flame forms local oxygen-deficient combustion through the structure of the low-nitrogen fairing 3, the temperature of the surface of the flame is reduced, the entrainment effect is formed at the first circular cone part 3.1 of the fairing 3 by the reflux flue gas, and the local flue gas recirculation can be reduced by more than 30 percent of NOx generation.
The present invention is not limited to the above-described embodiments. All technical schemes formed by adopting equivalent substitution fall within the protection scope of the invention.
Claims (10)
1. An indirect heat exchange type hot blast stove, which is characterized in that: the hot air furnace comprises a hot air furnace frame and a hot air furnace core body, wherein the hot air furnace core body is arranged in the hot air furnace frame;
the hot air furnace core comprises a combustion chamber, a turning air flue, an outer cylinder, a plate heat exchanger and a smoke exhaust bellows, wherein the combustion chamber is horizontally arranged at the middle upper part in the hot air furnace frame, one end of the combustion chamber is provided with a burner, the turning air flue is vertically arranged, the other end of the combustion chamber is communicated with the upper end of the turning air flue, the plate heat exchanger is horizontally arranged at the middle lower part in the hot air furnace frame, one side of the plate heat exchanger is provided with a hot side inlet, the hot side inlet is communicated with the lower end of the turning air flue, the other side of the plate heat exchanger is provided with a hot side outlet, the smoke exhaust bellows is close to the hot side outlet, the hot side outlet is communicated with the smoke exhaust bellows, the smoke exhaust bellows is communicated with a smoke exhaust port, and the smoke exhaust bellows is provided with a smoke exhaust fan; the combustion chamber and the turning air duct are arranged in the outer cylinder body, an interlayer between the combustion chamber and the turning air duct and the outer cylinder body is provided with a first air channel, the lower end of the first air channel is communicated with a cold side outlet of the plate heat exchanger, the upper end of the first air channel is communicated with an air outlet close to one side of the burner, and an air inlet is communicated with a cold side inlet of the plate heat exchanger;
a flue gas mixer and a fairing are coaxially arranged at the muzzle of the burner, the flue gas mixer comprises an outer ring cylinder and an inner ring cylinder which are coaxially arranged, and air leakage through holes are uniformly distributed on the inner ring cylinder; the first circular cone part and the second circular cone part of the fairing are sequentially connected into a whole along the flame head direction, and the first circular cone part is gradually widened, and the second circular cone part is gradually narrowed; the upper end of the smoke exhaust bellows is communicated with the smoke mixer.
2. The indirect heat exchange stove according to claim 1, characterized in that: cyclone distribution plates are uniformly distributed on the outer side wall of the junction of the first circular cone part and the second circular cone part of the fairing along the circumferential direction.
3. The indirect heat exchange stove according to claim 1, characterized in that: the middle part of the combustion chamber is provided with an expansion corrugated cylinder.
4. The indirect heat exchange stove according to claim 1, characterized in that: the outer wall of the combustion chamber, which is close to one side of the turning air duct, is uniformly provided with spiral air guide ribs at intervals.
5. The indirect heat exchange stove according to claim 1, characterized in that: the outer cylinder body is provided with triangular pressing grooves at intervals.
6. The indirect heat exchange stove according to claim 1, characterized in that: the burner is far away from one end of the combustion chamber and extends out of the hot blast stove frame and is provided with a combustion air inlet.
7. The indirect heat exchange stove according to claim 1, characterized in that: a plurality of heat exchange plates which are mutually overlapped are arranged in the plate heat exchanger, one surface of each heat exchange plate is provided with a large salient point, the other surface of each heat exchange plate is provided with a small salient point, one surfaces of two adjacent heat exchange plates, which are provided with large salient points, are mutually close to each other and are mutually abutted to form a second air channel, and two ends of the second air channel are respectively communicated with a cold side inlet and a cold side outlet; two adjacent heat exchange plates are provided with one side with small protruding points which are mutually close to each other and mutually abutted to form a smoke channel, and two ends of the smoke channel are respectively communicated with the hot side inlet and the hot side outlet.
8. The indirect heat exchange stove according to claim 1, characterized in that: and a limiting plate is arranged between the outer ring cylinder and the inner ring cylinder of the flue gas mixer.
9. The indirect heat exchange stove according to claim 1, characterized in that: the temperature measuring device comprises an outer cylinder body, and is characterized by further comprising a temperature measuring tube, wherein one end of the temperature measuring tube stretches into the outer cylinder body and is abutted to the outer side wall of the turning air duct, and a temperature probe is arranged in the temperature measuring tube.
10. The indirect heat exchange stove according to claim 1, characterized in that: and a heat preservation layer is filled in a gap between the hot blast stove frame and the hot blast stove core body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211076761.6A CN115406100B (en) | 2022-09-05 | 2022-09-05 | Indirect heat exchange type hot blast stove |
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| CN115406100A (en) | 2022-11-29 |
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