CN218914911U - Combustion system - Google Patents

Abstract

The utility model discloses a combustion system, which comprises a hearth, wherein a premixed combustion burner and an inlet and outlet structure are arranged on the hearth, the inlet and outlet structure comprises two inlet and outlet channels arranged on the side wall of the hearth, the inner openings of the two inlet and outlet channels are obliquely arranged towards one side close to the premixed combustion burner, and inlet and outlet modules are arranged at the positions of the two inlet and outlet channels. By adopting the scheme, if one of the two inlet and outlet channels is in the air inlet state and the other is in the air outlet state, when the combustion air is fed into one of the inlet and outlet channels through the inclined arrangement of the inlet and outlet channels, the combustion air can efficiently entrain the fuel fed from the premixed combustion burner to one side far away from the burner, so that the combustion air is fully mixed in the hearth to be efficiently combusted, and the problem that the combustion air of the combustion system of the traditional industrial metallurgical furnace cannot effectively entrain the fuel and is discharged through the air outlet is effectively solved.

Description

Combustion system

Technical Field

The utility model relates to the technical field of industrial metallurgical furnaces, in particular to a combustion system.

Background

Industrial furnaces for the thermal treatment of various materials or workpieces in metallurgical production processes. Thermal processing is a process that is characterized by the elevation of a material or workpiece, such as baking, smelting, heating, heat treating, drying, etc. Most production links of ferrous metallurgy and nonferrous metallurgy are not separated from an industrial metallurgical furnace. The prior industrial metallurgical furnace generally adopts natural gas as fuel, and carries out roasting smelting treatment on ores or nonferrous metal blocks in the furnace through a burner, and the prior metallurgical furnace generally comprises a fuel pipe, an air inlet and an air outlet, wherein the fuel pipe is used for feeding fuel into a hearth for full combustion, the air inlet and the air outlet of combustion air are used for discharging tail gas in the hearth, the air inlet of the combustion air can be fully combusted for the fuel, and the traditional air inlet and the air outlet are mostly directly connected into the hearth, so that the combustion air supplied by the air inlet can not effectively roll up the fuel, the fuel can not be uniformly mixed, the fuel can not be fully combusted, the fuel is discharged by the air outlet before being combusted, the combustion efficiency is low after being discharged, the cost is high, and the environment is polluted.

Therefore, the problem that the combustion air of the traditional industrial metallurgical furnace combustion system cannot effectively entrain fuel and then is discharged through the exhaust port is a problem which needs to be solved urgently at present.

Disclosure of Invention

The utility model aims to solve the defects in the prior art, and provides a combustion system which efficiently catches fuel through an inlet and outlet channel and ensures that the fuel is fully combusted in a hearth.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a combustion system, includes furnace, installs on the furnace and mixes burning nozzle in advance and advance row structure, advances row structure including setting up two on furnace lateral wall advance row passageway, and the interior mouth of two advances row passageway is all to the one side slope setting that is close to the burning nozzle in advance, and two advance row passageway departments all install into row module.

By adopting the scheme, if one of the two inlet and outlet channels is in the air inlet state and the other is in the air outlet state, when the combustion air is fed into one of the inlet and outlet channels through the inclined arrangement of the inlet and outlet channels, the combustion air can efficiently entrain the fuel fed from the premixed combustion burner to one side far away from the burner, so that the combustion air is fully mixed in the hearth to be efficiently combusted, and the problem that the combustion air of the combustion system of the traditional industrial metallurgical furnace cannot effectively entrain the fuel and is discharged through the air outlet is effectively solved.

In order to be suitable for small and medium-sized industrial metallurgical furnaces. The improvement is made on the basis of the embodiment, wherein two inlet and outlet channels are respectively positioned on two opposite side walls of the hearth, and one inlet and outlet channel and the premixed combustion burner are positioned on the same side wall of the hearth.

The following improvement is made on the basis of the embodiment, and the two inlet and outlet channels and the premixed combustion burner are positioned on the same side wall of the hearth.

The scheme is suitable for large-scale and oversized metallurgical furnaces, the following improvement is made on the basis of the embodiment, the premixed combustion burner and the feeding and discharging structure are both provided with two groups, and the two groups of premixed combustion burners are respectively positioned on two opposite side walls of a hearth.

The scheme is suitable for large and extra-large metallurgical furnaces, the improvement is made on the basis of the embodiment, the inlet and outlet structures are respectively arranged on the opposite side walls of the hearth, and as the span of the traditional large and extra-large industrial metallurgical furnaces is larger, the feeding distance of the premixed combustion burner is limited, and the combustion cannot be fully mixed, the two premixed combustion burners are matched with the corresponding inlet and outlet structures, and the full mixing and combustion of the fuel in the furnace are ensured.

The following improvements are made on the basis of the embodiment, and each air inlet and outlet module comprises an air inlet and outlet fan. The air inlet and exhaust fan adopts a bidirectional fan or a reversible axial flow fan, and the switching between air inlet and exhaust is realized through the reversion of the motor.

The improvement is made on the basis of the embodiment, each air inlet and outlet module comprises a heat storage box communicated with an air inlet and outlet channel pipeline, and the two heat storage boxes are connected with an air inlet generator and an air outlet generator through four-way reversing valves. And the four-way reversing valve is used for switching the internal channel to complete the communication between the air inlet generator and the air outlet generator and the corresponding heat storage box, and the air inlet and air outlet state switching of the air inlet and outlet channel is completed.

The improvement is made on the basis of the embodiment, and a flame detection structure positioned on the opposite side of the premixed combustion burner is arranged on the hearth and is used for detecting the flame state in the furnace and/or the flame state of the premixed combustion burner.

The improvement is made on the basis of the embodiment, the inner opening of the premixed combustion burner is obliquely arranged downwards and is used for being quickly melted in the phase process of converting nonferrous metals and ores from solid phase to liquid phase.

The improvement is made on the basis of the embodiment, the inner opening of the inlet and outlet channel is obliquely arranged downwards, and the state arrangement is also convenient for the fuel to be fully mixed in the process of converting a smelting object from a solid phase to a liquid phase, thereby being beneficial to high-efficiency smelting.

Compared with the prior art, the utility model has the following beneficial effects:

drawings

FIG. 1 is a schematic diagram of an overall structure of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of the overall structure of an embodiment of the present utility model;

FIG. 4 is a schematic overall structure of an embodiment of the present utility model;

FIG. 5 is a schematic diagram of the overall structure of an embodiment of the present utility model;

FIG. 6 is a schematic diagram of the overall structure of an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of the overall structure of the premix combustion structure of the present utility model;

FIG. 8 is an expanded view of the guide collar of the present utility model;

FIG. 9 is a cross-sectional view of a guide collar of the present utility model;

FIG. 10 is a bottom view of the combination transfer tube and refining chamber of the present utility model;

FIG. 11 is a cross-sectional view of the overall structure of an embodiment of the present utility model;

FIG. 12 is a schematic diagram of an exhaust module according to an embodiment of the present utility model;

fig. 13 is a schematic overall structure of an embodiment of the present utility model.

Detailed Description

Example 1

As shown in fig. 1 to 5, a combustion system comprises a furnace 10, wherein a premixed combustion burner 20 and an inlet and outlet structure are arranged on the furnace 10, the inlet and outlet structure comprises two inlet and outlet channels 11 arranged on the side wall of the furnace 10, inner openings of the two inlet and outlet channels 11 are obliquely arranged towards one side close to the premixed combustion burner 20, and inlet and outlet modules 30 are arranged at the positions of the two inlet and outlet channels 11.

By adopting the scheme, if one of the two air inlet and outlet channels 11 is in an air inlet state and the other air inlet and outlet channel is in an air outlet state, when combustion air is fed into one air inlet and outlet channel 11, the combustion air can efficiently roll fuel fed from the premixed combustion burner 20 to one side far away from the burner, combustion air can be efficiently combusted in the hearth 10, and the problem that the combustion air of a traditional industrial metallurgical furnace combustion system cannot effectively roll fuel and is discharged through an air outlet is effectively solved.

One embodiment is: as shown in fig. 3, in order to be suitable for the medium-and small-sized industrial metallurgical furnace, two inlet and outlet channels 11 are respectively positioned on two opposite side walls of the hearth 10, and one inlet and outlet channel 11 and a premixed combustion burner 20 are positioned on the side wall of the same hearth 10.

One embodiment is: as shown in fig. 1, in order to be suitable for a medium-and small-sized industrial metallurgical furnace, two of the inlet and outlet passages 11 and the premixed combustion burner 20 are positioned on the side wall of the same hearth 10.

One embodiment is: as shown in FIG. 5, the scheme is suitable for large and extra-large metallurgical furnaces, the premixed combustion burner 20 and the inlet and outlet structures are provided with two groups, and the two groups of premixed combustion burner 20 are respectively positioned on two opposite side walls of the hearth 10, and because the span of the traditional large and extra-large industrial metallurgical furnace is larger, the feeding distance of the premixed combustion burner 20 is limited, and the combustion cannot be fully mixed, the two premixed combustion burners 20 are matched with the corresponding inlet and outlet structures for ensuring the full mixing and combustion of the fuel in the furnace.

One embodiment is: this kind of scheme is applicable to large-scale, very big metallurgical furnace, as shown in fig. 4, advance row structure and be provided with two sets of respectively and be located on furnace 10 opposite lateral wall, because traditional large-scale, very big industrial metallurgical furnace's span is great, and the pay-off distance of premixed burner 20 is limited, can't carry out intensive mixing with the burning, so adopt two premixed burner 20 to cooperate corresponding advance row structure for guarantee the furnace fuel intensive mixing and burn.

One embodiment is: each of the intake and exhaust modules 30 includes an intake and exhaust fan. The air inlet and exhaust fan adopts a bidirectional fan or a reversible axial flow fan, and the bidirectional fan or the reversible axial flow fan is a product which can be directly purchased in the market, and the switching between air inlet and exhaust is realized through the reversing of a motor of the product.

One embodiment is: as shown in fig. 2 and 12, each of the intake and exhaust modules 30 includes a heat storage tank in pipe communication with the intake and exhaust channels 11, and the two heat storage tanks are connected with an intake generator 31 and an exhaust generator 32 through a four-way reversing valve 31. The internal channels are switched through the four-way reversing valve to complete the communication between the air inlet generator 32 (a blower) and the air outlet generator 33 (an induced draft fan) and the corresponding heat storage boxes, and the air inlet and outlet states of the air inlet and outlet channels 11 are switched. The four-way reversing valve 31 switches the internal channels so that the two heat storage boxes are crossed and communicated with the air inlet generator 32 and the air inlet and outlet generator 33, and the four-way reversing valve 31 performs reversing treatment at any time of 15s, 30s and 60s, so that the circulation work of air inlet and outlet, air inlet and outlet of each air inlet and outlet channel 11 is completed.

One embodiment is: as shown in fig. 13, the flame detecting structure 40 located at the opposite side of the premixed combustion burner 20 is installed on the furnace 10, and is used for detecting the flame state in the furnace and/or the flame state of the premixed combustion burner 20, the inner opening of the premixed combustion burner 20 is obliquely arranged downwards and is used for fast melting in the process of converting the nonferrous metal and ore from solid phase to liquid phase, and the inner opening of the inlet and outlet channel 11 is obliquely arranged downwards and is also convenient for fully mixing the fuel in the process of converting the smelting material from solid phase to liquid phase, thereby being beneficial to efficient smelting.

Example 2

As shown in fig. 7 to 10, during the operation of the premixed combustion burner 20, the intake and exhaust cycle switching process is performed through the corresponding intake and exhaust passages 11 by the intake and exhaust module 30, and when natural gas is used as fuel, the combustion-supporting gas and fuel ratio is 10:1, fuel is generally fed through the premix burner tip 20, where the fuel is relatively high, so that the combustion gas and fuel are 10:1, so that the combustion-supporting gas is supplemented in the combustion-supporting gas during the circulation switching process of the air inlet and the air outlet, the fuel in the internal area of the hearth is fully mixed and completely covers the internal area of the hearth, the internal area of the hearth is in a flame combustion state, the premixed combustion burner 20 is provided with a feeding channel, a plurality of small conveying pipes 21 and large conveying pipes 22 which are arranged outside the small conveying pipes 21 are arranged on the premixed combustion burner 20 at the feeding inlet of the feeding channel. The fuel is distributed and supplied to the inside of the conveying large pipe 22 for supplying the combustion air through the conveying small pipes 21, when the conveying small pipes 21 enter the inside of the conveying large pipe 22, the fuel can be fully mixed, even if the fuel conveyed by the conveying small pipes 21 is ignited at an outlet, the combustion air in the inside of the conveying large pipe 22 can be supplied to small flames at the port of the conveying small pipe 21 positioned at the inner side through gaps among the conveying small pipes 21, and finally the problem that the conventional scheme cannot be adopted to achieve both fluid rigidity and mixing with the combustion air, so that nitrogen oxides are generated in the combustion process is solved. The traditional scheme adopts a centralized fuel supply mode, and the fuel is supplied in a centralized mode, so that certain fluid rigidity exists in the fuel supply process, and the fuel and the combustion-supporting gas are not easy to be fully mixed in a limited time/distance due to the existence of the fluid rigidity; if the rigidity of the fuel fluid is reduced, the mixed fuel and the combustion-supporting gas are ignited, and then the flame after ignition is deviated to the position close to the fuel outlet, so that the just discharged fuel is ignited, the mixing area of the combustion-supporting gas and the fuel is shortened, the fuel cannot be fully mixed with the combustion-supporting gas, and once the just discharged fuel is ignited, the fuel with higher temperature at the outer side is sealed and is in contact with oxygen in the middle of the flame, so that the higher temperature of the outer side flame and the lower temperature of the inner flame occur, and nitrogen oxides are easy to occur.

Example 3

As shown in fig. 7 to 10, the premixed combustion structure further includes a refining chamber 23 communicating with a plurality of small conveying pipes 21, and the refining chamber 23 is mounted on the large conveying pipe 22, with the following modifications being made on the basis of the above embodiments. The fuel introduced into the small delivery pipe 21 can be supplied at an equal flow rate by the refining chamber 23, and the flame intensity can be ensured.

Example 4

As shown in fig. 7 to 10, the improvement is made on the basis of the above embodiment, the guide ring sleeve 24 and the spacers 25 which are positioned inside the guide ring sleeve 24 and sleeved outside the plurality of small conveying pipes 21 are installed inside the large conveying pipe 22, a distance of 5-50 mm, preferably 15mm, is reserved between the rear end of the spacers 25 and the end of the large conveying pipe 22, the guide ring sleeve 24 is provided with swirl guide openings 26 which are uniformly distributed in the circumferential direction, the premixed combustion structure further comprises a flame detection structure 27 and an ignition structure 28, and the flame detection structure 27 and the ignition structure 28 are inserted inside the large conveying pipe 22. The combustion air input from the inlet of the large conveying pipe 22 is subjected to swirl treatment through the swirl guide opening 26, enters the rear side of the small conveying pipe 21 through the rear end outlet of the spacer bush 25 to perform combustion-supporting treatment, the combustion air swirl treatment is convenient to be fully mixed with fuel, the flame detection structure 27 adopts an ultraviolet flame detection sensor in the prior art, and the ignition structure is preferably a pilot flame.

Example 5

As shown in fig. 7 to 10, the following improvement is made on the basis of the above embodiment, the burner 20 is installed obliquely downwards on the furnace 10, the inside of the feeding channel of the burner 20 is provided with an accelerating structure 29, the ignited flame can be flushed out into the furnace at high speed through the accelerating structure 29, the flame rigidity of the flame can be kept, the flame cannot deviate left and right when the feeding and discharging structure works, the premixed combustion structure further comprises a first pipeline 210 and a second pipeline 211, the first pipeline 210 is inserted into the inner side of the second pipeline 211, a distance of 5-25 mm, preferably 15mm, is reserved between the outlet end face of the first pipeline 210 and the outlet end face of the second pipeline 211, and the second pipeline 211 is partially positioned in the conveying large pipe 22. The fuel introduced into the first pipe 210 enters the second pipe 211, then is mixed with the air introduced into the second pipe 211, and finally is injected and ignited.

In any of the above schemes, at least one control valve is installed at the inlet of the refining chamber 23 and the inlet of the first pipeline 210, and the air feeder is installed at the inlet of the large conveying pipe 22 and the inlet of the second pipeline 211, and the control valve may be a blower, and may be an existing control valve structure such as a speed regulating valve, a switching valve, an electromagnetic flow valve, a pneumatic valve, etc., and the flow rate or flow rate is controlled by the control valve structure. When the liquid phase in the furnace is insulated or the two inlet and outlet channels 11 are in the air inlet and air outlet switching process, the supply of the large conveying pipe 11 and the small conveying pipe 21 can be cut off, only the small flow supply of the first pipeline 210 and the second pipeline 211 is reserved, and the large conveying pipe 11, the small conveying pipe 21, the first pipeline 210 and the second pipeline 211 can be selected to be in all supply states in the process of converting the solid phase into the liquid phase in the furnace.

Claims (10)

1. The utility model provides a combustion system, includes furnace, its characterized in that installs on the furnace and mixes burning nozzle in advance and advance row structure, advance row structure including setting up two on furnace lateral wall advance row passageway, two are advanced row passageway's internal orifice and are all to being close to one side slope setting of premixing burning nozzle, advance row's module in two and all install in row passageway department.

2. A combustion system as in claim 1 wherein two of said inlet and outlet passages are located on opposite side walls of the furnace, respectively, and wherein one of said inlet and outlet passages and the premixed burner are located on the same side wall of the furnace.

3. A combustion system as in claim 1 wherein both of said inlet and outlet passages and premix burner nozzles are located on the same furnace sidewall.

4. A combustion system according to any one of claims 1 to 3, wherein the premixed burner and the inlet and outlet structure are provided in two groups, and the premixed burners are respectively located on two opposite side walls of the hearth.

5. A combustion system as claimed in any one of claims 1 to 3 wherein the inlet arrangement is provided with two sets of opposed side walls of the furnace.

6. A combustion system according to any one of claims 1 to 3, wherein each of the intake and exhaust modules comprises an intake and exhaust fan.

7. A combustion system according to any one of claims 1 to 3, wherein each of the intake and exhaust modules comprises a heat storage tank in communication with an intake and exhaust passage conduit, the two heat storage tanks being connected to an intake air generator and an exhaust air generator by a four-way reversing valve.

8. A combustion system as claimed in any one of claims 1 to 3 wherein the furnace has mounted thereon flame detection structures located on opposite sides of the premix burner.

9. A combustion system according to any one of claims 1 to 3, wherein the inner opening of the premix burner nozzle is inclined obliquely downwards.

10. A combustion system as in claim 9 wherein the inner ports of the intake and exhaust passages are inclined downwardly.

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