CN104359314B - The energy-saving heating furnace system of a kind of Mist heat recovering and flue gas waste heat recovery method - Google Patents

The energy-saving heating furnace system of a kind of Mist heat recovering and flue gas waste heat recovery method Download PDF

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CN104359314B
CN104359314B CN201410653605.0A CN201410653605A CN104359314B CN 104359314 B CN104359314 B CN 104359314B CN 201410653605 A CN201410653605 A CN 201410653605A CN 104359314 B CN104359314 B CN 104359314B
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flue gas
heating furnace
air
temperature
heat exchange
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CN104359314A (en
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周振华
周强
喻道明
秦涔
郭俊
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention discloses the energy-saving heating furnace system of a kind of Mist heat recovering, it includes heating furnace, and described heating furnace is connected with heat exchange unit by high-temperature flue gas pipeline, and described heat exchange unit is connected with chimney by low-temperature flue gas pipeline;Described heating furnace is connected with heat exchange unit by high temperature air pipeline, and described heat exchange unit is connected with blower fan by Cryogenic air pipeline;Described heat exchange unit includes wind mixed chamber and regenerator, and described wind mixed chamber is provided with burner, and described burner is connected with air and coal gas respectively.The invention also discloses a kind of flue gas waste heat recovery method.This system is not only simple in structure, and low-heat value gas can be adopted to produce, thus reducing the consumption of high heating value gas, and energy-conservation environmental protection again;This system can realize recycling of fume afterheat, reduces energy loss, thus having saved production cost.The method technique is simple, and feasibility is high;Exhaust heat utilization effect is good.

Description

The energy-saving heating furnace system of a kind of Mist heat recovering and flue gas waste heat recovery method
Technical field
The present invention relates to the flue gas waste heat recovery of field of metallurgy, particularly relate to energy-saving heating furnace system and the flue gas waste heat recovery method of a kind of Mist heat recovering.
Background technology
In metallurgical industry, heating furnace is for heating metal stock to be processed.Heating furnace burning fuel, the high-temperature flue gas that fuel combustion generates flows in burner hearth, is transferred heat to metal stock and hearth wall by astable diabatic process, is then passed through exhaust opening and discharges heating furnace.The flue-gas temperature that heating furnace is discharged is higher, and at intensification section later stage and soaking zone, flue-gas temperature can reach 1100 DEG C ~ 1250 DEG C, and recycling a large amount of physics latent heat wherein contained is the key technology improving thermal efficiency of heating furnace.
At present, waste heat of flue gas of heating furnace reclaims three kinds of technology of main employing, and the first adopts metal-air preheater Mist heat recovering;Its two be application heat-accumulating burner;It three is Waste Heat Generation.Metal-air preheater takes up an area relatively big, and to preheating of air temperature between 350 DEG C ~ 450 DEG C, the temperature after flue gas waste heat recovery is between 500 DEG C ~ 600 DEG C, and flue gas heat recovery rate is minimum.Heat-accumulating burner is the regenerative combustion technology risen in the recent period, the highest air can be heated to 1000 DEG C, and smog discharge temperature about 150 DEG C, it is high to the recovery utilization rate of fume afterheat.But heat-accumulating burner needs fast switching device supporting with it, will complete once to switch every several minutes, equipment and control level requirement is high, and owing to intensification early stage inner flue gas of the stove temperature is low, preheating of air temperature is relatively low, high heating value gas must being used to be fuel for quickly adding hot metal billets, operating cost is high.Waste Heat Generation also has application on the heating furnace of some iron and steel enterprise, its method is to install vaporizer on flue to produce supersaturated vapor, supersaturated vapor is utilized to carry out pushing turbine work, thus realizing generating, but because heating furnace duration of work exhaust gas volumn and flue-gas temperature are non-constant, there is the feature of discontinuity, therefore, this mode has its limitation in the application, exists and has high input, the shortcoming that income is little.
Therefore, we are in the urgent need to a kind of new flue gas heat recovery system, to solve the defect that existing flue gas waste heat recovery system has high input, cost is high.
Summary of the invention
It is an object of the invention to provide the energy-saving heating furnace system of a kind of Mist heat recovering and flue gas waste heat recovery method, this system structure is simple, can efficient Mist heat recovering, effectively minimizing flue gas waste heat recovery cost;This off-gas recovery method can use low-heat value gas, reduces high heating value gas consumption, energy-conserving and environment-protective.
The present invention provides the energy-saving heating furnace system of a kind of Mist heat recovering, and it includes heating furnace, and described heating furnace is connected with heat exchange unit by high-temperature flue gas pipeline, and described heat exchange unit is connected with chimney by low-temperature flue gas pipeline;Described heating furnace is connected with heat exchange unit by high temperature air pipeline, and described heat exchange unit is connected with blower fan by Cryogenic air pipeline;Described heat exchange unit includes wind mixed chamber and regenerator, and described wind mixed chamber is provided with burner, and described burner is connected with air and coal gas respectively;
Described heat exchange unit has more than 2.
The present invention also provides for a kind of method that fume afterheat is reclaimed by energy-saving heating furnace system adopting Mist heat recovering, and it comprises the steps:
Step one, high temperature air spray the coal gas mixed combustion with gas pipeline transportation service from the air chamber spout in heating furnace and form fire curtain to metal stock heat temperature raising;
The high-temperature flue gas that step 2, heating furnace are discharged enters wind mixed chamber and the regenerator for the treatment of accumulation of heat through high-temperature flue gas pipeline, the high-temperature flue gas of flue gas and heating furnace discharge that wind mixed chamber carries burner combustion generation is mixed into mixed flue gas, mixed flue gas enters back into after carrying out heat exchange with heat storage in regenerator and makes mixed flue gas temperature decline, enter chimney then through by low-temperature flue gas pipeline, be discharged to outward in air;
Step 3, pressurizeed by blower fan after air enter wind mixed chamber and the regenerator of accumulation of heat through Cryogenic air pipeline, being heated to form high temperature air with heat storage generation heat exchange in regenerator, high temperature air enters the air chamber in heating furnace through wind mixed chamber and high temperature air pipeline.
By such scheme, described step one is repeated circular treatment to step 3.
By such scheme, in step 2, the temperature of described mixed flue gas is 900 DEG C ~ 1250 DEG C.
By such scheme, in step 2, mixed flue gas enters back into after carrying out heat exchange with heat storage in regenerator and makes mixed flue gas temperature drop to less than 180 DEG C.
By such scheme, in step 3, described high temperature air is 800 DEG C ~ 1100 DEG C.
In the present invention, the high-temperature flue gas that heating furnace is discharged enters wind mixed chamber through high-temperature flue gas pipeline, producing with wind mixed chamber burner combustion to enter regenerator after flue gas mix, mixed flue gas is discharged in air again through outside low-temperature flue gas pipeline entrance chimney after transferring heat to heat storage.Air is entered the regenerator being complete accumulation of heat after blower fan pressurizes by Cryogenic air pipeline, Cryogenic air heated by heat storage after then through the air chamber being entered in heating furnace by high temperature air pipeline, after air port sprays, form fire curtain with coal gas mixed combustion to metal stock heat temperature raising.
The energy-saving heating furnace system of the Mist heat recovering in the present invention, is not only simple in structure, and owing to air preheating temperature is high, low-heat value gas can be adopted to produce, thus high heating value gas, energy-conservation environmental protection again can be used less or not use;This system can realize recycling of fume afterheat, reduces energy loss, thus having saved production cost;System accurately controls the temperature in wind mixed chamber and regenerator by detecting controller, thus ensureing the safety produced and being smoothed out;Whole system makes simple, and floor space is little, is suitable for the popularization and application of all field of metallurgy flue gas heat recoveries.In the present invention, flue gas waste heat recovery method technique is simple, and feasibility is high;Exhaust heat utilization effect is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of the energy-saving heating furnace system of Mist heat recovering of the present invention.
Fig. 2 is the structural representation of heating furnace.
Fig. 3 is the A direction view in Fig. 2.
In figure: 1, heating furnace, 2-1, high-temperature flue gas pipeline, 2-2, low-temperature flue gas pipeline, 3-1, Cryogenic air pipeline, 3-2 high temperature air pipeline, 4, gas piping, 5, wind mixed chamber, 6, regenerator, 7, chimney, 8, blower fan, 10, burner, 11, burner hearth, 12, air chamber, 13, air port, 14, air intake.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
Referring to Fig. 1-Fig. 3, the energy-saving heating furnace system of a kind of Mist heat recovering, it includes heating furnace 1, and described heating furnace 1 is connected with high-temperature flue gas pipeline 2-1, heat exchange unit, low-temperature flue gas pipeline 2-2, chimney 7 successively;Described heating furnace 1 is connected with high temperature air pipeline 3-2, heat exchange unit, Cryogenic air pipeline 3-1, blower fan 8 successively.
Described heat exchange unit can adopt two or more, and in the present embodiment, described heat exchange unit is two;Each heat exchange unit includes wind mixed chamber 5 and regenerator 6, and described wind mixed chamber 5 is provided with burner 10, and described burner 10 is connected with air and coal gas respectively;Being provided with detection controller on air and gas piping, described detection controller includes flow detection unit and flow regulating unit, to regulate the air and gas flow entering burner.
Described heating furnace 1 includes burner hearth 11 and is positioned at the air chamber 12 of burner hearth 11 both sides, and described burner hearth 11 is connected by air port 13 with air chamber 12;Described air port 13 is 0 ° ~ 45 ° angles with horizontal direction.Described air chamber 12 is connected with high temperature air pipeline 3-2 by air intake 14, described heating furnace is connected with gas piping 4, coal gas in gas piping 4 and the high temperature air mixed combustion from air chamber 12 ejection produce high-temperature flue gas to after metal stock heating, are delivered in the wind mixed chamber 5 of heat exchange unit again through high-temperature flue gas pipeline 3-1.
The flue gas that the high-temperature flue gas of described wind mixed chamber 5 burns with burner 10 is mixed to form 900 DEG C ~ 1250 DEG C mixed flue gas, mixed flue gas carries out heat exchange with the heat storage in regenerator 6, the temperature making mixed flue gas drops to after below 180 DEG C, discharges through low-temperature flue gas pipeline 2-2, chimney 7.Blower fan 8 will be delivered in regenerator 6 through Cryogenic air pipeline 3-1 after air pressurized, heat exchange is carried out with the heat storage in regenerator 6, making air themperature rise between 800 DEG C ~ 1100 DEG C, this high temperature air is through the air chamber of wind mixed chamber 5, high temperature air pipeline 3-2 entrance heating furnace 1 subsequently.
In the present embodiment, in described regenerator 6, heat storage is piled up constituted by flame-proof sphere or checkerwork cell brick.
In the present embodiment, described chimney 7 is connected with the regenerator 6 of heat exchange unit respectively through low-temperature flue gas pipeline 2-2;Described low-temperature flue gas pipeline 2-2, high-temperature flue gas pipeline 2-1, Cryogenic air pipeline 3-1, high temperature air pipeline 3-2, gas piping, air intake pipe are designed with valve, to control air inflow respectively;It is designed with temperature monitoring system, in order to control the temperature of heat exchange unit, it is ensured that being smoothed out of production in described wind mixed chamber 5, regenerator 6;Described Cryogenic air pipeline 3-1 also is provided with flow detection and flow regulating unit, in order to control the air inflow of air.
For better heat exchange, it is possible to air chamber 12 to be arranged on the surrounding of burner hearth 11, it is possible to wind mixed chamber 5 to be placed in the top (the application is not limited to this setup) of regenerator 6.In order to ensure that what produce is smoothed out, the energy-saving heating furnace system of described Mist heat recovering also includes detection controller, described detection controller regulates wind mixed chamber's burner coal gas and air mass flow according to the temperature of wind mixed chamber's mixed flue gas, and described detection controller regulates heating furnace coal gas and high temperature air flow according to heating furnace programming rate.
The present embodiment further relates to a kind of method that fume afterheat is reclaimed by energy-saving heating furnace system adopting above-mentioned Mist heat recovering, and it specifically includes following steps:
Step one, high temperature air spray the coal gas mixed combustion with gas piping 4 conveying from the air chamber spout in heating furnace 1 and form fire curtain to metal stock heat temperature raising;
The high-temperature flue gas that step 2, heating furnace 1 are discharged enters wind mixed chamber 5 and the regenerator 6 for the treatment of accumulation of heat through high-temperature flue gas pipeline 2-1, the high-temperature flue gas of flue gas and heating furnace 1 discharge that wind mixed chamber 5 carries burner 10 burning generation is mixed into the mixed flue gas that temperature is 900 DEG C ~ 1250 DEG C, mixed flue gas enters back into after carrying out heat exchange with heat storage in regenerator 6 and makes mixed flue gas temperature drop to less than 180 DEG C, enter chimney 7 then through by low-temperature flue gas pipeline 2-2, be discharged to outward in air;
Step 3, pressurizeed by blower fan 8 after air enter wind mixed chamber 5 and the regenerator 6 of accumulation of heat through Cryogenic air pipeline 3-1, being heated to form, with heat storage generation heat exchange, the high temperature air that temperature is 800 DEG C ~ 1100 DEG C in regenerator 6, high temperature air enters the air chamber in heating furnace 1 through wind mixed chamber 5 and high temperature air pipeline 3-2;
Step 4, described step one are repeated circular treatment to step 3.
In the present invention, in heating furnace 1, design has air chamber, and high temperature air forms fire curtain to metal stock heat temperature raising from the coal gas mixed combustion of the ejection of air chamber spout with gas piping 4 conveying.Wind mixed chamber 5 and regenerator 6 Group Design, be generally 2 groups, alternately accumulation of heat and heat release.Heating furnace 1 connects with 2 groups of wind mixed chamber 5 and regenerator 6 and chimney 7 respectively through flue, connects with 2 groups of wind mixed chamber 5 and regenerator 6 and blower fan 8 respectively through air line.The high-temperature flue gas that heating furnace 1 is discharged enters wind mixed chamber 5 and the regenerator 6 of wherein treating accumulation of heat through high-temperature flue gas pipeline 2-1, the high-temperature flue gas of flue gas and heating furnace 1 discharge that wind mixed chamber 5 carries burner combustion generation is mixed into the mixed flue gas that temperature is 900 DEG C ~ 1250 DEG C, mixed flue gas enters back into temperature after carrying out heat exchange with heat storage in the regenerator 6 of accumulation of heat and is down to less than 180 DEG C, again enters via low-temperature flue gas pipeline 2-2 and is discharged in air outside chimney 7.Air after being pressurizeed by blower fan 8 enters wind mixed chamber 5 and the regenerator 6 of wherein accumulation of heat through Cryogenic air pipeline 3-1, being heated to 800 DEG C ~ 1100 DEG C with heat storage generation heat exchange in regenerator 6, high temperature air enters the air chamber in heating furnace 1 through wind mixed chamber 5 and high temperature air pipeline 3-2.Air and the gas flow of system is regulated by detecting and controlling system.

Claims (3)

1. an energy-saving heating furnace system for Mist heat recovering, it includes heating furnace, it is characterised in that: described heating furnace is connected with heat exchange unit by high-temperature flue gas pipeline, and described heat exchange unit is connected with chimney by low-temperature flue gas pipeline;Described heating furnace is connected with heat exchange unit by high temperature air pipeline, and described heat exchange unit is connected with blower fan by Cryogenic air pipeline;Described heat exchange unit includes wind mixed chamber and regenerator, and described wind mixed chamber is provided with burner, and described burner is connected with air and coal gas respectively;
Described heat exchange unit has more than 2;
Described heating furnace includes burner hearth and is positioned at the air chamber of burner hearth both sides, and described burner hearth is connected by air port with air chamber;Described air port and horizontal direction are 0 ° ~ 45 ° angles;
Described system also includes detection controller, and described detection controller regulates wind mixed chamber's burner coal gas and air mass flow according to the temperature of wind mixed chamber's mixed flue gas, and described detection controller regulates heating furnace coal gas and high temperature air flow according to heating furnace programming rate.
2. the energy-saving heating furnace system of Mist heat recovering according to claim 1, it is characterised in that: in described regenerator, heat storage is piled up constituted by flame-proof sphere or checkerwork cell brick.
3. the method that fume afterheat is reclaimed by the energy-saving heating furnace system adopting arbitrary Mist heat recovering in claim 1-2, it is characterised in that it comprises the steps:
Step one, high temperature air spray the coal gas mixed combustion with gas pipeline transportation service from the air chamber spout in heating furnace and form fire curtain to metal stock heat temperature raising;
The high-temperature flue gas that step 2, heating furnace are discharged enters wind mixed chamber and the regenerator for the treatment of accumulation of heat through high-temperature flue gas pipeline, the high-temperature flue gas of flue gas and heating furnace discharge that wind mixed chamber carries burner combustion generation is mixed into mixed flue gas, mixed flue gas enters back into after carrying out heat exchange with heat storage in regenerator and makes mixed flue gas temperature decline, enter chimney then through by low-temperature flue gas pipeline, be discharged to outward in air;
Step 3, pressurizeed by blower fan after air enter wind mixed chamber and the regenerator of accumulation of heat through Cryogenic air pipeline, being heated to form high temperature air with heat storage generation heat exchange in regenerator, high temperature air enters the air chamber in heating furnace through wind mixed chamber and high temperature air pipeline;
Described step one is repeated circular treatment to step 3;
In step 2, the temperature of described mixed flue gas is 900 DEG C ~ 1250 DEG C;
In step 2, mixed flue gas enters back into after carrying out heat exchange with heat storage in regenerator and makes mixed flue gas temperature drop to less than 180 DEG C;
In step 3, described high temperature air is 800 DEG C ~ 1100 DEG C.
CN201410653605.0A 2014-11-18 2014-11-18 The energy-saving heating furnace system of a kind of Mist heat recovering and flue gas waste heat recovery method Active CN104359314B (en)

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CN110160368A (en) * 2019-06-17 2019-08-23 龙净科杰环保技术(上海)有限公司 A kind of adjustable glass furnace residual neat recovering system

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CN102878817A (en) * 2012-09-25 2013-01-16 北京神雾环境能源科技集团股份有限公司 Continuous combusting regenerative industrial furnace
CN103438478A (en) * 2013-08-08 2013-12-11 珠海市威望节能科技有限公司 Rotary regenerative combustion device of aluminum melting furnace
CN103880270A (en) * 2014-03-13 2014-06-25 珠海市威望节能科技有限公司 Annular glass kiln for reutilizing waste heat

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6228329B1 (en) * 1994-03-04 2001-05-08 Durr Environmental Two chamber regenerative thermal or catalytic oxidizer with purging circuit
US5538420A (en) * 1994-11-21 1996-07-23 Durr Industries, Inc. Heat exchanger bake out process
CN2816724Y (en) * 2005-02-06 2006-09-13 吴兰 Hot-blast-furnace waste-gas after-heat recovering apparatus
CN1844822A (en) * 2006-04-05 2006-10-11 华中科技大学 Waste gas treatment device capable of simultaneously recovering waste heat and removing contaminant
CN102878817A (en) * 2012-09-25 2013-01-16 北京神雾环境能源科技集团股份有限公司 Continuous combusting regenerative industrial furnace
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CN103880270A (en) * 2014-03-13 2014-06-25 珠海市威望节能科技有限公司 Annular glass kiln for reutilizing waste heat

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