CN115406100A - Indirect heat exchange type hot blast stove - Google Patents
Indirect heat exchange type hot blast stove Download PDFInfo
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- CN115406100A CN115406100A CN202211076761.6A CN202211076761A CN115406100A CN 115406100 A CN115406100 A CN 115406100A CN 202211076761 A CN202211076761 A CN 202211076761A CN 115406100 A CN115406100 A CN 115406100A
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- hot blast
- blast stove
- heat exchange
- air
- air channel
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- 239000000779 smoke Substances 0.000 claims abstract description 47
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- 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 37
- 239000011229 interlayer Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims 1
- 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
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002950 deficient Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000000463 material Substances 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
- 238000004321 preservation Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001035 drying Methods 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
- 229920000742 Cotton Polymers 0.000 description 1
- 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
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 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
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
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- 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
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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
- 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
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 blast stove core comprises a combustion chamber, a turning air channel, an outer cylinder, a plate heat exchanger and a smoke exhaust air box, wherein a burner is arranged at one end of the combustion chamber, and a first air channel is arranged between the combustion chamber and the outer cylinder as well as an interlayer between the turning air channel and the outer cylinder; the muzzle of the burner is coaxially provided with a flue gas mixer and a fairing, and the upper end of the smoke exhaust air box is communicated with the flue gas mixer. The root of the flame 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 surface of the flame in the first circular cone cylinder part of the fairing is quickly reduced, local oxygen-deficient combustion is formed, and the generation of NOx is reduced; and due to the entrainment effect formed at the first circular cone part, the flue gas is locally recycled, and the generation of NOx is reduced.
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 thermodynamic machine, is widely applied in China in the end of the 20 th century 70 s, and becomes an upgrading product of an electric heat source and a traditional steam power heat source in many 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 smoke is not allowed to directly contact with a drying material. The indirect heat exchange type hot blast stove has the working principle that heat generated by fuel combustion is exchanged to fresh air through a heat exchanger, the air is not in contact with flue gas in the process, and the heated air is used for drying materials, so that the indirect heat exchange type hot blast stove is widely applied to the fields of food, medicine, glass fiber, fine chemical engineering 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 easily formed when the NOx is discharged into the atmosphere, and the NOx is harmful to the environment and human bodies, so the pollutant discharge standard executed in China is more and more strict. According to the latest national standard GB13271-2012 boiler atmospheric pollutant emission standard regulation: NOx emission of newly-built gas-fired boiler can not exceed 200mg/m 3 (100 ppm), the central area is not more than 150mg/m 3 (75 ppm). With the promotion of national environmental protection on NOx emission requirements, a plurality of provinces and cities are provided with local boiler standards at present, and the emission of nitrogen oxides cannot exceed 30mg in Beijing, zheng, and other places.
The NOx produced by the combustion of natural gas is mainly thermal NOx and fast NOx. The formation of thermal NOx is mainly influenced by temperature, the integral number of oxygen and the residence time in the high temperature zone, and the formation of rapid NOx is mainly influenced by the fuel concentration and the volume fraction of oxygen. In order to make the pollutant emission reach the standard, a low-nitrogen burner is generally adopted, and although the low-nitrogen burner 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 by the technical personnel in the field.
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 blast stove core comprises a combustion chamber, a turning air channel, an outer cylinder, a plate heat exchanger and a smoke exhaust air box, wherein the combustion chamber is horizontally arranged at the middle upper part in a hot blast stove frame; the combustion chamber and the turning air channel are arranged in the outer cylinder body, an interlayer between the combustion chamber and the turning air channel as well as 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, one side of the upper end of the first air channel, which is close to the combustor, is communicated with an air outlet, and a cold side inlet of the plate heat exchanger is communicated with an air inlet;
a gun mouth of the combustor is coaxially provided with a flue gas flow mixer and a fairing, the flue gas flow mixer comprises an outer ring barrel and an inner ring barrel which are coaxially arranged, and air leakage through holes are uniformly distributed in the inner ring barrel; the fairing comprises a first circular cone cylinder part and a second circular cone cylinder part which are integrally manufactured, wherein the first circular cone cylinder part of the fairing is arranged close to the combustor and is uniformly provided with air leakage through holes; the upper end of the smoke exhaust air box is communicated with the smoke mixer.
The improvement of the technical scheme is as follows: the first circular cone cylinder portion of radome fairing and the circular cone cylinder portion juncture lateral wall of second are provided with cyclone distributor plate along the circumferencial direction equipartition.
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 air guide ribs are uniformly arranged on the outer wall of one side, close to the turning air duct, of the combustion chamber at intervals.
The improvement of the technical scheme is as follows: the outer cylinder is provided with triangular pressure grooves at intervals.
The improvement of the technical scheme is as follows: one 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-supporting air inlet.
The improvement of the technical scheme is as follows: a plurality of heat exchange plate sheets which are overlapped with each other are arranged in the plate heat exchanger, a large salient point is arranged on one surface of each heat exchange plate sheet, a small salient point is arranged on the other surface of each heat exchange plate sheet, one surfaces of two adjacent heat exchange plate sheets which are provided with the large salient points are arranged 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 a cold side inlet and a cold side outlet; one side of two adjacent heat exchange plate sheets provided with small convex points is close to each other and is arranged, the small convex points are mutually abutted to form a flue gas channel, and two ends of the flue gas channel are respectively communicated with a hot side inlet and a hot side outlet.
The improvement of the technical scheme is as follows: a limiting plate is arranged between the outer ring barrel and the inner ring barrel of the flue gas mixer.
The improvement of the technical scheme is as follows: still include the temperature tube, the one end of temperature tube stretches into outer barrel and with the lateral wall butt in the wind channel of turning round, is provided with temperature probe in the temperature tube.
The improvement of the technical scheme is as follows: the heat insulation layer is filled in the clearance between the hot blast stove frame and the hot blast stove core body.
The invention adopts the technical scheme that the method has the beneficial effects that:
(1) In the indirect heat exchange type hot air furnace, 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 conical cylinder part of the fairing is quickly reduced, local oxygen-deficient combustion is formed, and the generation of NOx is reduced; and because the speed of the smoke formed by combustion in the second circular cone-shaped cylinder part of the fairing is high, part of the returned smoke wraps the outer side of the first circular cone-shaped cylinder part of the fairing through the cyclone distribution plate, and because the speed of the returned smoke on the outer side of the first circular cone-shaped cylinder part is low, the entrainment effect is formed at the first circular cone part, the local flue gas is recycled, and the generation of NOx is reduced, and compared with the conventional combustor which directly burns in a combustion chamber, the arrangement can reduce the generation of NOx by more than 30%;
(2) In the indirect heat exchange type hot air furnace, 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) According to the indirect heat exchange type hot blast stove, air surrounds the combustion chamber with the expansion corrugated cylinder through the air guiding effect of the air guiding fins, high-temperature flue gas transfers heat to the air through radiation, no high-temperature dead angle is formed in 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 furnace, the outer cylinder body is uniformly provided with the triangular pressure grooves at intervals, the triangular pressure grooves enable the outer cylinder body to resist pressure of 50Kpa, and meanwhile, a welding seam cannot crack due to high temperature and high pressure;
(5) In the indirect heat exchange type hot air furnace, one surface of a heat exchange plate in a plate heat exchanger is provided with large salient points, and the other surface of the heat exchange plate is provided with small salient points, the large salient points are self-supported to form a second air channel, the small salient points are self-supported to form a flue gas channel, the amount of heated air is far greater than the amount of flue gas, the distance between air side channels is greater than the distance between flue gas side channels, the wind resistance is small, the heat exchange efficiency is high, the flue gas exhaust temperature of a hot air furnace 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, the dissipation of heat in the stove to the environment is reduced, and the heat efficiency of the hot blast stove is improved.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of an indirect heat exchange type hot blast stove according to an embodiment of the present invention;
FIG. 2 is a schematic view of a cowling structure of an indirect heat exchange hot blast stove according to an embodiment of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a schematic left-side view structure diagram of a flue gas flow mixer of the indirect heat exchange type hot blast stove according to the embodiment of the invention;
FIG. 5 is a schematic structural diagram of a side of a heat exchange plate of the indirect heat exchange type hot blast stove provided with large convex points according to the embodiment of the invention;
FIG. 6 is a schematic structural diagram of a side of a heat exchange plate of the indirect heat exchange type hot blast stove provided with small salient points according to the embodiment of the invention;
FIG. 7 is a partial sectional view of a heat exchange plate of the indirect heat exchange type hot blast stove according to the embodiment of the invention;
wherein: 1-burner, 1.1-combustion air inlet, 2-flue gas mixer, 2.1-outer ring cylinder, 2.2-inner ring cylinder, 2.3-limit plate, 3-fairing, 3.1-first circular cone cylinder, 3.2-second circular cone cylinder, 4-cyclone distribution plate, 5-air outlet, 6-combustion chamber, 7-expansion corrugated cylinder, 8-outer cylinder, 8.1-triangular pressure groove, 9-wind guiding fin, 10-first air channel, 11-turning air channel, 12-temperature measuring tube, 13-plate heat exchanger, 13.1-heat exchange plate, 13.2-big salient point, 13.3-small salient point, 13.4-flue gas channel, 13.5-second air channel, 14-hot blast furnace frame, 15-air inlet, 16-heat preservation layer, 17-smoke exhaust fan, 18-smoke exhaust port, 19-smoke exhaust air box.
Detailed Description
Examples
The indirect heat exchange type hot blast stove of the embodiment, as shown in fig. 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 blast stove core comprises a combustion chamber 6, a turning air channel 11, an outer cylinder 8, a plate heat exchanger 13 and a smoke exhaust air box 19, wherein the combustion chamber 6 is horizontally arranged at the middle upper part in a hot blast stove frame 14, one end of the combustion chamber 6 is provided with a burner 1, the turning air channel 11 is vertically arranged, the other end of the combustion chamber 6 is communicated with the upper end of the turning air channel 11, the plate heat exchanger 13 is horizontally arranged at the middle lower part in the hot blast stove 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 channel 11, the other side of the plate heat exchanger 13 is provided with a hot side outlet, the smoke exhaust air box 19 is arranged close to the hot side outlet, the hot side outlet is communicated with the smoke exhaust air box 19, the smoke exhaust air box 19 is communicated with a smoke exhaust port 18, and the smoke exhaust air box 19 is provided with a smoke exhaust fan 17; the combustion chamber 6 and the turning air channel 11 are arranged in the outer cylinder 8, an interlayer between the combustion chamber 6 and the turning air channel 11 as well as the outer cylinder 8 is provided with a first air channel 10, the lower end of the first air channel 10 is communicated with a cold side outlet of the plate type heat exchanger 13, one side of the upper end of the first air channel 10, which is close to the combustor 1, is communicated with an air outlet 5, and a cold side inlet of the plate type 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.
A flue gas mixer 2 and a fairing 3 are coaxially arranged at a muzzle of the combustor 1, the flue gas 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-shaped cylinder part 3.1 and a second circular cone-shaped cylinder part 3.2 which are integrally manufactured, and the first circular cone-shaped cylinder part 3.1 of the fairing 3 is arranged close to the combustor 1 and is uniformly provided with air leakage through holes; the upper end of the smoke exhaust air box 19 is communicated with the smoke gas mixer 2. One end of the burner 1, which is far away from the combustion chamber 6, extends out of the hot blast stove frame 14 and is provided with a combustion air inlet 1.1. And 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 direction of the arrows in fig. 4 is the direction of the return flue gas flow.
In the indirect heat exchange type hot blast stove of this embodiment, as shown in fig. 2 and 3, the cyclone distribution plates 4 are uniformly arranged on the outer side wall of the junction of the first circular cone part 3.1 and the second circular cone part 3.2 of the fairing 3 along the circumferential direction.
In the indirect heat exchange type hot blast stove of the embodiment, an expansion bellows 7 is arranged in the middle of the combustion chamber 6. Spiral air guide ribs 9 are uniformly arranged on the outer wall of the combustion chamber 6 close to one side of the turning air channel 11 at intervals. The outer cylinder body 8 is provided with triangular pressure grooves 8.1 at intervals.
In the indirect heat exchange type hot air furnace of the embodiment, as shown in fig. 5-7, a plurality of heat exchange plate sheets 13.1 which are mutually overlapped are arranged in the plate heat exchanger 13, one surface of each heat exchange plate sheet 13.1 is provided with a large convex point 13.2, the other surface of each heat exchange plate sheet 13.1 is provided with a small convex point 13.3, one surfaces of the adjacent two heat exchange plate sheets 13.1 which are provided with the large convex points 13.2 are 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 surfaces of two adjacent heat exchange plates 13.1 provided with the small salient points 13.3 are close to each other, the small salient 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 a hot side inlet and a hot side outlet.
The indirect heat exchange type hot blast stove of the embodiment further comprises a temperature measuring pipe 12 as shown in fig. 1, one end of the temperature measuring pipe 12 extends into the outer cylinder 8 and is abutted against the outer side wall of the turning air duct 11, and a temperature probe is arranged in the temperature measuring pipe 12. The clearance between the hot blast stove frame 14 and the hot blast stove core body is filled with a heat insulation 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 wool. The turning air duct 11 is an integrated mould pressing expansion cylinder which can resist 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 volute of the smoke exhaust fan is saved, the structure is compact, the material consumption is low, and the purchase 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 the electric control valve and then communicated with a chimney, the combustor 1 is inserted into the smoke mixer 2 in the furnace body, the root of the formed flame is rectified, in the process 3, backflow smoke enters from the air leakage through hole of the fairing 3, the temperature of the flame surface in the first circular cone-shaped cylinder part 3.1 of the fairing 3 is rapidly reduced, local oxygen-deficient combustion is formed, the generation of NOx is reduced, meanwhile, the smoke velocity formed by combustion in the second circular cone-shaped cylinder part 3.2 of the fairing 3 is high, part of the backflow smoke wraps the outer side of the first circular cone-shaped cylinder part 3.1 of the fairing 3 through the cyclone distribution plate 4, and due to the fact that the backflow smoke velocity is low on the outer side of the first circular cone-shaped cylinder part 3.1, a entrainment effect is formed on the position of the first circular cone-shaped cylinder part 3.1, local smoke is recirculated, and the generation of NOx is reduced. Heated air enters the plate heat exchanger 13 from the air inlet 15, the air temperature gradually rises after convection heat transfer, the heated air enters the first air channel 10, the combustion chamber 6 with the expansion corrugated cylinder 7 surrounded is surrounded under the action of the air guide fins 9, high-temperature flue gas transfers heat to the air through radiation, and the hot air enters the hot air 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 a smoke exhaust air box 19 by a smoke exhaust fan 17, the top of the smoke exhaust air box 19 is connected with a flue gas flow mixer 2, a smoke exhaust port 18 is arranged on the side surface of the smoke exhaust air box and is connected with an electric adjusting valve, partial flue gas is controlled to enter the flue gas flow mixer 2 (the backflow amount is less than or equal to 20%) through valve adjustment, combustion flame forms local oxygen-deficient combustion through a fairing 3 structure designed with low nitrogen, the temperature of the surface of the flame is reduced, the backflow flue gas forms a entrainment effect at a first circular cone part 3.1 of the fairing 3, the local flue gas is recycled, and the generation of NOx can be reduced by more than 30%.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (10)
1. An indirect heat exchange formula hot-blast furnace which characterized in that: the 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 blast stove core comprises a combustion chamber, a turning air channel, an outer cylinder, a plate heat exchanger and a smoke exhaust air box, wherein the combustion chamber is horizontally arranged at the middle upper part in a hot blast stove frame, a burner is arranged at one end of the combustion chamber, the turning air channel is vertically arranged, the other end of the combustion chamber is communicated with the upper end of the turning air channel, the plate heat exchanger is horizontally arranged at the middle lower part in the hot blast stove frame, a hot side inlet is arranged at one side of the plate heat exchanger, the hot side inlet is communicated with the lower end of the turning air channel, a hot side outlet is arranged at the other side of the plate heat exchanger, the smoke exhaust air box is arranged close to the hot side outlet, the hot side outlet is communicated with the smoke exhaust air box, the smoke exhaust air box is communicated with a smoke exhaust port, and the smoke exhaust air box is provided with a smoke exhaust fan; the combustor and the turning air channel are arranged in the outer cylinder body, an interlayer between the combustor and the outer cylinder body and between the combustor and the turning air channel and the outer cylinder body is 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 combustor, 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;
a gun mouth of the combustor is coaxially provided with a flue gas mixer and a fairing, the flue gas mixer comprises an outer ring cylinder and an inner ring cylinder which are coaxially arranged, and the inner ring cylinder is uniformly provided with air leakage through holes; the fairing comprises a first circular cone cylinder part and a second circular cone cylinder part which are manufactured into a whole, wherein the first circular cone cylinder part of the fairing is arranged close to the combustor and is uniformly provided with air leakage through holes; the upper end of the smoke exhaust air box is communicated with the smoke mixer.
2. The indirect heat exchange hot blast 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 cylinder part and the second circular cone cylinder part of the fairing along the circumferential direction.
3. The indirect heat exchange hot blast 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 hot blast stove according to claim 1, characterized in that: spiral air guide ribs are uniformly arranged on the outer wall of one side, close to the turning air duct, of the combustion chamber at intervals.
5. The indirect heat exchange hot blast stove according to claim 1, characterized in that: the outer cylinder body is provided with triangular pressure grooves at intervals.
6. The indirect heat exchange hot blast stove according to claim 1, characterized in that: one end of the combustor, which is far away from the combustion chamber, extends out of the hot blast stove frame and is provided with a combustion-supporting air inlet.
7. The indirect heat exchange hot blast stove according to claim 1, characterized in that: the plate heat exchanger is internally provided with a plurality of mutually superposed heat exchange plate sheets, one surfaces of the heat exchange plate sheets are provided with large salient points, the other surfaces of the heat exchange plate sheets are provided with small salient points, the surfaces of two adjacent heat exchange plate sheets provided with the large salient points are arranged 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 a cold side inlet and a cold side outlet; two adjacent the one side that the heat transfer plate system had little bump is close to the setting each other just little bump butt each other forms flue gas channel, flue gas channel's both ends set up with hot side import and hot side export intercommunication respectively.
8. The indirect heat exchange hot blast 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 hot blast stove according to claim 1, characterized in that: still include the temperature tube, the one end of temperature tube stretch into outer barrel and with the lateral wall butt in wind channel turns round, be provided with temperature probe in the temperature tube.
10. The indirect heat exchange hot blast stove according to claim 1, characterized in that: and a heat insulation 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115406100A true CN115406100A (en) | 2022-11-29 |
| CN115406100B CN115406100B (en) | 2024-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211076761.6A Active CN115406100B (en) | 2022-09-05 | 2022-09-05 | Indirect heat exchange type hot blast stove |
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| CN115406100B (en) | 2024-01-12 |
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