CN103471410B - A kind of fuel heating furnace waste heat recycle method and system - Google Patents

A kind of fuel heating furnace waste heat recycle method and system Download PDF

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CN103471410B
CN103471410B CN201310425087.2A CN201310425087A CN103471410B CN 103471410 B CN103471410 B CN 103471410B CN 201310425087 A CN201310425087 A CN 201310425087A CN 103471410 B CN103471410 B CN 103471410B
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air
over valve
way change
heating furnace
heat storage
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CN201310425087.2A
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CN103471410A (en
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李�杰
李一惟
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李�杰
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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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • 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

Abstract

The invention provides a kind of fuel heating furnace waste heat recycle method and system, this system comprises: accumulation of heat off-gas recovery case, the first four-way change-over valve, the second four-way change-over valve, drive cylinder, PLC, air preheater, air-introduced machine, chimney, heating furnace, air blast and air cleaner; Accumulation of heat off-gas recovery case comprises the first heat storage and the second heat storage, and the first four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and chimney; Second four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and air blast; First four-way change-over valve and the second four-way change-over valve connect driving cylinder respectively; Drive cylinder under PLC controls, change the phase place of the first four-way change-over valve and the second four-way change-over valve.The present invention can reclaim low-temperature flue gas waste heat, eliminates the dew point corrosion of air preheater simultaneously.

Description

A kind of fuel heating furnace waste heat recycle method and system

Technical field

The invention relates to petrochemical technology, particularly about the heat recovery technology of fuel heating furnace, concretely, is about a kind of fuel heating furnace waste heat recycle method and system.

Background technology

Fuel heating furnace is the capital equipment of petroleum chemical industry, and its energy consumption accounting reaches enterprise's energy about 40%, and the waste heat of heating furnace generally adopts air preheater to be reclaimed.As shown in Figure 1, due to traditional residual neat recovering system technical equipment constraint, the final exhaust gas temperature after waste heat recovery still up to 140 ~ 260 DEG C not etc., causes waste and the environmental pollution of the energy.And the dew point corrosion phenomenon of the interior air-coil of air preheater seriously, need often maintenance and change, during operation, also wanting the air pre-mixing of a part of preheating of pumpback, to improve inlet air temperature, reducing dew point corrosion.In addition, the air themperature of preheating after former off-gas recovery is general still on the low side, adds fuel consumption.The heating furnace total amount of petroleum chemical enterprise is large, and fuel consumption is many, does not also have correlation engineering technology to solve this problem at present.

Summary of the invention

The invention provides a kind of fuel heating furnace waste heat recycle method and system, to reclaim low-temperature flue gas waste heat, eliminate the dew point corrosion of air preheater simultaneously.

To achieve these goals, the invention provides a kind of fuel heating furnace waste heat recycling system, described system comprises: accumulation of heat off-gas recovery case, the first four-way change-over valve, second four-way change-over valve, drive cylinder, PLC, air preheater, air-introduced machine, chimney, heating furnace, air blast and air cleaner; Described accumulation of heat off-gas recovery case comprises the first heat storage and the second heat storage, and the first described four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and chimney; The second described four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and air blast; The first described four-way change-over valve and the second four-way change-over valve connect described driving cylinder respectively; Described driving cylinder changes the phase place of described first four-way change-over valve and the second four-way change-over valve under described PLC controls, and makes:

High-temperature flue gas from described heating furnace enters described chimney by the shell side of described air preheater and the first described heat storage successively; Cold wind enters the second described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater; Or

High-temperature flue gas from described heating furnace enters described chimney by the shell side of described air preheater and the second described heat storage successively; Cold wind enters the first described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by the tube side of described air preheater.

Further, described PLC, specifically for the driving cylinder according to exhaust gas temperature, gas component and flow-control, makes the first four-way change-over valve and the second four-way change-over valve described in described driving air cylinder driven.

Further, described driving cylinder is pneumatic cylinder.

Further, described driving cylinder is electric cylinder.

To achieve these goals, the present invention also provides a kind of fuel heating furnace waste heat recycle method, and be applied to above-mentioned fuel heating furnace waste heat recycling system, described method comprises:

Step 1: control described first four-way change-over valve and the second four-way change-over valve, makes the high-temperature flue gas from described heating furnace enter described chimney by the shell side of described air preheater and the first described heat storage successively; Cold wind enters the second described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater;

Step 2: after exhaust gas temperature, gas component and flow meet the first threshold of setting, control described first four-way change-over valve and the second four-way change-over valve, make the high-temperature flue gas from described heating furnace enter described chimney by the shell side of described air preheater and the second described heat storage successively; Cold wind enters the first described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by the tube side of described air preheater; After exhaust gas temperature, gas component and flow meet the Second Threshold of setting, return step 1.

Further, in described step 1, when the high-temperature flue gas from described heating furnace passes through the shell side of described air preheater, the air in the tube side of air preheater described in preheating.

Further, in described step 2, when the high-temperature flue gas from described heating furnace passes through the shell side of described air preheater, the air in the tube side of air preheater described in preheating.

Further, when described first four-way change-over valve and the commutation of the second four-way change-over valve, described first four-way change-over valve and the second four-way change-over valve keep phase difference t=f (alv); Wherein, l is length of pipeline, and v is medium rate, v=f (Q1, Q2), and Q1, Q2 are respectively medium flue gas and air mass flow, and a is incidence coefficient.

In one embodiment, the first threshold that exhaust gas temperature, coefficient of excess air and flow meet setting comprises: exhaust gas temperature is less than 105 DEG C, and coefficient of excess air is less than 1.1.

In one embodiment, the Second Threshold that exhaust gas temperature, coefficient of excess air and flow meet setting comprises: exhaust gas temperature is less than 105 DEG C, and coefficient of excess air is less than 1.1.

The beneficial effect of the embodiment of the present invention is, there is no the low-temperature flue gas technique that recovery 120 to 200 is spent both at home and abroad at present, fuel heating furnace waste heat recycling system of the present invention achieves low-temperature heat accumulating technology and applies in petroleum chemical heating furnace first.The exhaust gas temperature of fuel heating furnace waste heat recycling system of the present invention, lower than 100 degree, is saved fuel in a large number, is reduced energy resource consumption.Owing to entering the raising of the air themperature of former air preheater, solve the dew point corrosion problem of air preheater.The air themperature entering heating furnace significantly improves, and improves combustion situation and heat transfer efficiency.In addition, fuel heating furnace waste heat recycling system of the present invention does not need the high temperature air that refluxes.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation of former reheat furnace system;

Fig. 2 is the structural representation of embodiment of the present invention fuel heating furnace waste heat recycling system;

Fig. 3 is that the medium of embodiment of the present invention fuel heating furnace waste heat recycling system when being in A condition flows to schematic diagram;

Fig. 4 is that the medium of embodiment of the present invention fuel heating furnace waste heat recycling system when being in B state flows to schematic diagram;

Fig. 5 is the flow chart of embodiment of the present invention fuel heating furnace waste heat recycle method.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Do not imply the order of the precedence between any priority, order of priority, each assembly or the step performed by method in description and claim in order to the use itself of modifying ordinal numbers such as " first ", " second ", " the 3rd " of assembly, and only distinguish the different assemblies with same names (there is different ordinal number) with making a check mark.

As shown in Figure 2, Figure 3 and Figure 4, the invention provides a kind of fuel heating furnace waste heat recycling system, this fuel heating furnace waste heat recycling system comprises: accumulation of heat off-gas recovery case 201, first four-way change-over valve 301, second four-way change-over valve 302, drive cylinder 303, PLC, air preheater 106, air-introduced machine 101, chimney 102, heating furnace 103, air blast 104 and air cleaner 105.

As shown in Figure 3, accumulation of heat off-gas recovery case 201 comprises the first heat storage 304 and the second heat storage 305, first four-way change-over valve 301 is connected respectively by pipeline with the first heat storage 304, second heat storage 305, air preheater 106 and chimney 102.

Second four-way change-over valve 302 is connected respectively by pipeline with the first heat storage 304, second heat storage 305, air preheater 106 and air blast 104.

First four-way change-over valve 301 and the second four-way change-over valve 302 connect driving cylinder 303 respectively, drive cylinder 303 to be connected to PLC(ProgrammableLogicController, programmable logic controller (PLC)) (not shown).PLC drives cylinder 303 according to exhaust gas temperature, gas component and flow-control, makes driving cylinder 303 drive the first four-way change-over valve 301 and the second four-way change-over valve 302 to commutate.Drive cylinder to be pneumatic cylinder or electric cylinder, concrete according to field condition, the operating process such as thermometric, temperature control, air blast, smoke evacuation, all automatically completes under PLC regulable control.Ensure that the air of heat storage storing, in exothermic process and exhaust gas temperature accurately control all the time in the scope of setting, ensure that the constant temperature of flue gas is discharged.

Cylinder 303 is driven under the control of PLC, to change the phase place of the first four-way change-over valve 301 and the second four-way change-over valve 302, under making fuel heating furnace waste heat recycling system be operated in A condition or B state.

A condition: the first heat storage 304 enters flue gas heat absorption, and the second heat storage 305 enters cold wind heat release, and under driving the driving of cylinder 303, two reversal valves are in same phase place.High-temperature flue gas from heating furnace 103 enters in chimney 102 by the shell side of air preheater 106 and the first heat storage 304 successively; Cold wind enters the second heat storage 305 by air cleaner 105 and air blast 104 successively and heats, and becomes hot blast, enter heating furnace 103 by air preheater 106 after heating.

When the first heat storage 304 enters flue gas heat absorption, when second heat storage 305 enters cold wind heat release state, flue gas pipeline between air preheater 106 and the first heat storage 304 is by the second four-way change-over valve 302 conducting, and the flue gas pipeline between the first heat storage 304 and chimney 102 is by the first four-way change-over valve 301 conducting; Air pipe line between air blast 104 and the second heat storage 305 is by the second four-way change-over valve 302 conducting, and the air pipe line between the second heat storage 305 and air preheater 106 is by the first four-way change-over valve 301 conducting.

In A condition, when the high-temperature flue gas from heating furnace 103 passes through the shell side of air preheater 106, air in the tube side of preheated air preheater 106, flue gas after cooling enters the first heat storage 304 through the second four-way change-over valve 302, the heat of the flue gas after the first heat storage 304 absorbing, cooling, generate low-temperature flue gas (useless flue gas), useless flue gas enters chimney 102 by the first four-way change-over valve 301.Cold wind from air blast 104 enters the second heat storage 305 through the second four-way change-over valve 302, second heat storage 305 release heat is by cold wind preheating, become hot blast after preheating, after the tube side entering air preheater 106 through the first four-way change-over valve 301 heats again, enter heating furnace 103.After exhaust gas temperature, gas component and flow meet the threshold value of setting, drive cylinder 303 under the control of PLC, make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutate, enter B state.In one embodiment, when exhaust gas temperature be less than 105 DEG C, coefficient of excess air (gas component) be less than 1.1 time, enter B state.Gas flow can set according to concrete operating mode, repeats no more.

B state: the first heat storage 304 enters cold wind heat release, the second heat storage 305 enters flue gas heat absorption.High-temperature flue gas from heating furnace 103 enters chimney 102 by the shell side of air preheater 106 and the second heat storage 305 successively; Cold wind enters the first heat storage 304 by air cleaner 105 and air blast 104 successively and heats, and becomes hot blast, enter heating furnace 103 by the tube side of air preheater 106 after heating.

Flue gas pipeline between air preheater 106 and the second heat storage 305 is by the second four-way change-over valve 302 conducting, and the flue gas pipeline between the second heat storage 305 and chimney 102 is by the first four-way change-over valve 301 conducting; Air pipe line between air blast 104 and the first heat storage 304 is by the second four-way change-over valve 302 conducting, and the air pipe line between the first heat storage 304 and air preheater 106 is by the first four-way change-over valve 301 conducting.

In B state, when the high-temperature flue gas from heating furnace 103 passes through the shell side of air preheater 106, air in the tube side of preheated air preheater 106, flue gas after cooling enters the second heat storage 305 through the second four-way change-over valve 302, the heat of the flue gas after the second heat storage 305 absorbing, cooling, generate low-temperature flue gas (useless flue gas), useless flue gas enters chimney 102 by the first four-way change-over valve 301.Cold wind from air blast 104 enters the first heat storage 304 through the second four-way change-over valve 302, first heat storage 304 release heat is by cold wind preheating, become hot blast after preheating, after the tube side entering air preheater 106 through the first four-way change-over valve 301 heats again, enter heating furnace 103.After exhaust gas temperature, gas component and flow meet setting threshold value, drive cylinder 303 under the control of PLC, make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutate, return A condition.In one embodiment, when exhaust gas temperature be less than 105 DEG C, coefficient of excess air (gas component) be less than 1.1 time, enter A condition.Gas flow can set according to concrete operating mode, repeats no more.

Above-mentioned A, B two states hocket, and in pipeline and the first heat storage 304 and the second heat storage 305, medium (wind and flue gas) namely alternately passes through.Mutually disturb for avoiding front and back two media, during commutation, first four-way change-over valve 301 and the second four-way change-over valve 302 need to keep certain phase difference, the time delay interval of the first four-way change-over valve 301 and the second four-way change-over valve 302 and commutation cycle, need to set according to after the index calculate such as field pipes setting, flow, flow velocity, exhaust gas temperature.In one embodiment, phase difference t=f (alv), wherein, l is length of pipeline, and v is medium rate, v=f (Q1, Q2), and Q1, Q2 are respectively medium flue gas and air mass flow, and a is medium incidence coefficient.

As shown in Figure 5, the present embodiment provides a kind of fuel heating furnace waste heat recycle method, and be applied to above-mentioned fuel heating furnace waste heat recycling system, the method comprises:

S501: control described first four-way change-over valve and the second four-way change-over valve, makes the high-temperature flue gas from described heating furnace enter described chimney by the shell side of described air preheater and the first described heat storage successively; Cold wind enters the second described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater;

S502: judge whether exhaust gas temperature, gas component and flow meet the threshold value of setting, if so, carry out step S503, if not, continues to perform S501.

S503: control described first four-way change-over valve and the second four-way change-over valve, makes the high-temperature flue gas from described heating furnace enter described chimney by the shell side of described air preheater and the second described heat storage successively; Cold wind enters the first described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by the tube side of described air preheater.

S504: judge whether exhaust gas temperature, gas component and flow meet the threshold value of setting, if so, carry out step S501, if not, continues to perform S503.

Above-mentioned S501 and S503 be corresponding A state and B state respectively.

In S501, when the high-temperature flue gas from heating furnace 103 passes through the shell side of air preheater 106, air in the tube side of preheated air preheater 106, flue gas after cooling enters the first heat storage 304 through the second four-way change-over valve 302, the heat of the flue gas after the first heat storage 304 absorbing, cooling, generate low-temperature flue gas (useless flue gas), useless flue gas enters chimney 102 by the first four-way change-over valve 301.Cold wind from air blast 104 enters the second heat storage 305 through the second four-way change-over valve 302, second heat storage 305 release heat is by cold wind preheating, become hot blast after preheating, after the tube side entering air preheater 106 through the first four-way change-over valve 301 heats again, enter heating furnace 103.After exhaust gas temperature, gas component and flow meet the threshold value of setting, drive cylinder 303 under the control of PLC, make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutate, enter S503.

In S503, when the high-temperature flue gas from heating furnace 103 passes through the shell side of air preheater 106, air in the tube side of preheated air preheater 106, flue gas after cooling enters the second heat storage 305 through the second four-way change-over valve 302, the heat of the flue gas after the second heat storage 305 absorbing, cooling, generate low-temperature flue gas (useless flue gas), useless flue gas enters chimney 102 by the first four-way change-over valve 301.Cold wind from air blast 104 enters the first heat storage 304 through the second four-way change-over valve 302, first heat storage 304 release heat is by cold wind preheating, become hot blast after preheating, after the tube side entering air preheater 106 through the first four-way change-over valve 301 heats again, enter heating furnace 103.After exhaust gas temperature, gas component and flow meet setting threshold value, drive cylinder 303 under the control of PLC, make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutate, return S501.

Above-mentioned A, B two states hocket, and in pipeline and the first heat storage 304 and the second heat storage 305, medium (wind and flue gas) namely alternately passes through.Mutually disturb for avoiding front and back two media, during commutation, first four-way change-over valve 301 and the second four-way change-over valve 302 need to keep certain phase difference, the time delay interval of the first four-way change-over valve 301 and the second four-way change-over valve 302 and commutation cycle, need to set according to after the index calculate such as field pipes setting, flow, flow velocity, exhaust gas temperature.In one embodiment, phase difference t=f (alv); Wherein, l is length of pipeline, and v is medium rate, v=f (Q1, Q2), and Q1, Q2 are respectively medium flue gas and air mass flow, and a is incidence coefficient.

Heat storage of the present invention mainly contains ceramic honey comb, heat-storing sphere and heat accumulation pipe three kinds.The specific area of ceramic honey comb is more than 5 times of ball, and doubly, gas-flow resistance only has 1/3 of ball to the large 4-5 of heat-transfer capability, and depth of penetration heating is little.So ceramic honey comb is more conducive to realizing low oxygen combustion than heat-storing sphere, make that furnace temperature is even, heat transfer rate is large.Adopt the regenerator volume of ceramic honey comb to greatly reduce, the burner of q.s can be arranged, meet thermic load needs.And the straight gas channel of ceramic honey comb more not easily blocks compared with the labyrinth passage of bead, self-cleaning is good, is applicable to unclean feature of burning.Corundum/mullite, cordierite/mullite compound phase honeycomb ceramic heat accumulator has the remarkable advantages such as high temperature resistant, anticorrosive, good thermal shock stability, intensity are high, accumulation of heat heat is large, good heat conductivity.Table 1 is ceramic honey comb performance indications (for RCO catalyst carriers).

Fuel heating furnace waste heat recycling system of the present invention and original system technical-economic index contrast as follows:

1, for every platform heating furnace of application heat accumulating type fuel heating furnace waste heat recycling system, on average energy-saving effect can be obtained: save combustion gas 985 tons/year, consume combustion gas 19083 tons/year calculating by annual, combustion gas saving rate reaches 5.16%: add up to expense capable of saving fuel 6,900,000 yuan/year altogether.

2, for the every platform heating furnace not establishing air preheat recovery system, exhaust gas temperature is 260 DEG C, application heat accumulating type low-temperature flue gas waste heat recovery system, and exhaust gas temperature drops to 100 DEG C, and annual saving combustion gas 1902 tons, combustion gas saving rate reaches 9.96%.By combustion gas 7000 yuan/ton calculating, expense capable of saving fuel 1331.4 ten thousand yuan/year.As calculated by 2000, whole nation heating furnaces of the same type, in the ratio transformation of 10%, the huge fuel cost of 13.8 hundred million yuan can be saved stove year for 200.

Fuel heating furnace waste heat recycling system of the present invention possesses following advantage: there is no the low-temperature flue gas technique that recovery 120 to 200 is spent both at home and abroad at present, fuel heating furnace waste heat recycling system of the present invention achieves low-temperature heat accumulating technology and applies in petroleum chemical heating furnace first.The exhaust gas temperature of fuel heating furnace waste heat recycling system of the present invention, lower than 100 degree, is saved fuel in a large number, is reduced energy resource consumption.Owing to entering the raising of the air themperature of former air preheater, solve the dew point corrosion problem of air preheater.The air themperature entering heating furnace significantly improves, and improves combustion situation and heat transfer efficiency.In addition, fuel heating furnace waste heat recycling system of the present invention does not need the high temperature air that refluxes.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (9)

1. a fuel heating furnace waste heat recycling system, is characterized in that, described system comprises: accumulation of heat off-gas recovery case, the first four-way change-over valve, second four-way change-over valve, drives cylinder, PLC, air preheater, air-introduced machine, chimney, heating furnace, air blast and air cleaner;
Described accumulation of heat off-gas recovery case comprises the first heat storage and the second heat storage, and the first described four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and chimney; The second described four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and air blast; The first described four-way change-over valve and the second four-way change-over valve connect described driving cylinder respectively;
Described driving cylinder changes the phase place of described first four-way change-over valve and the second four-way change-over valve under described PLC controls, and described first four-way change-over valve and the second four-way change-over valve keep phase difference t=f (alv); Wherein, l is length of pipeline, and v is medium rate, v=f (Q1, Q2), and Q1, Q2 are respectively medium flue gas and air mass flow, and a is incidence coefficient, makes:
High-temperature flue gas from described heating furnace enters described chimney by the shell side of described air preheater and the first described heat storage successively; Cold wind enters the second described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater; Or
High-temperature flue gas from described heating furnace enters described chimney by the shell side of described air preheater and the second described heat storage successively; Cold wind enters the first described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by the tube side of described air preheater.
2. fuel heating furnace waste heat recycling system according to claim 1, it is characterized in that, described PLC, specifically for the driving cylinder according to exhaust gas temperature, gas component and flow-control, makes the first four-way change-over valve and the second four-way change-over valve described in described driving air cylinder driven.
3. fuel heating furnace waste heat recycling system according to claim 2, is characterized in that, described driving cylinder is pneumatic cylinder.
4. fuel heating furnace waste heat recycling system according to claim 2, is characterized in that, described driving cylinder is electric cylinder.
5. a fuel heating furnace waste heat recycle method, be applied to fuel heating furnace waste heat recycling system according to claim 1, it is characterized in that, described method comprises:
Step 1: control described first four-way change-over valve and the second four-way change-over valve, makes the high-temperature flue gas from described heating furnace enter described chimney by the shell side of described air preheater and the first described heat storage successively; Cold wind enters the second described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater;
Step 2: after exhaust gas temperature, coefficient of excess air and flow meet the first threshold of setting, control described first four-way change-over valve and the second four-way change-over valve, make the high-temperature flue gas from described heating furnace enter described chimney by the shell side of described air preheater and the second described heat storage successively; Cold wind enters the first described heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by the tube side of described air preheater; After exhaust gas temperature, coefficient of excess air and flow meet the Second Threshold of setting, return step 1;
When described first four-way change-over valve and the commutation of the second four-way change-over valve, described first four-way change-over valve and the second four-way change-over valve keep phase difference t=f (alv); Wherein, l is length of pipeline, and v is medium rate, v=f (Q1, Q2), and Q1, Q2 are respectively medium flue gas and air mass flow, and a is incidence coefficient.
6. fuel heating furnace waste heat recycle method according to claim 5, it is characterized in that, in described step 1, when the high-temperature flue gas from described heating furnace passes through the shell side of described air preheater, the air in the tube side of air preheater described in preheating.
7. fuel heating furnace waste heat recycle method according to claim 5, it is characterized in that, in described step 2, when the high-temperature flue gas from described heating furnace passes through the shell side of described air preheater, the air in the tube side of air preheater described in preheating.
8. fuel heating furnace waste heat recycle method according to claim 5, is characterized in that, the first threshold that exhaust gas temperature, coefficient of excess air and flow meet setting comprises: exhaust gas temperature is less than 105 DEG C, and coefficient of excess air is less than 1.1.
9. fuel heating furnace waste heat recycle method according to claim 5, is characterized in that, the Second Threshold that exhaust gas temperature, coefficient of excess air and flow meet setting comprises: exhaust gas temperature is less than 105 DEG C, and coefficient of excess air is less than 1.1.
CN201310425087.2A 2013-09-17 2013-09-17 A kind of fuel heating furnace waste heat recycle method and system CN103471410B (en)

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CN105485710A (en) * 2014-10-09 2016-04-13 中国石油化工股份有限公司 Air preheating method for waste sulfuric acid splitting process
GB2550771B (en) * 2015-01-12 2021-02-03 Fulton Group N A Inc Cyclonic inlet air filter and fluid heating systems and combustion burners having the same
CN110529872B (en) * 2018-07-24 2020-11-17 苏州海陆重工股份有限公司 Power station boiler waste heat utilization system based on inlet flue gas temperature communication control
CN110793320A (en) * 2019-10-24 2020-02-14 山东豪门铝业有限公司 Melt aluminium stove waste heat recovery and recycle device

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