CN103471410A - Residual heat recycling method and system for fuel heating furnace - Google Patents

Residual heat recycling method and system for fuel heating furnace Download PDF

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CN103471410A
CN103471410A CN2013104250872A CN201310425087A CN103471410A CN 103471410 A CN103471410 A CN 103471410A CN 2013104250872 A CN2013104250872 A CN 2013104250872A CN 201310425087 A CN201310425087 A CN 201310425087A CN 103471410 A CN103471410 A CN 103471410A
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air
heating furnace
over valve
way change
heat
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CN2013104250872A
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Chinese (zh)
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CN103471410B (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 residual heat recycling method and system for a fuel heating furnace. The system comprises a heat-accumulating flue gas recovery box, a first four-way reversing valve, a second four-way reversing valve, a driving air cylinder, a PLC (Programmable Logic Controller), an air preheater, a draught fan, a chimney, a heating furnace, a blower and an air filter, wherein the heat-accumulating flue gas recovery box comprises a first heat-accumulating body and a second heat-accumulating body; the first four-way reversing valve is connected with the first heat-accumulating body, the second heat-accumulating body, the air preheater and the chimney respectively; the second four-way reversing valve is connected with the first heat-accumulating body, the second heat-accumulating body, the air preheater and the blower respectively; the first four-way reversing valve and the second four-way reversing valve are connected with the driving air cylinder respectively; the driving air cylinder is used for changing the phases of the first four-way reversing valve and the second four-way reversing valve under the control of the PLC. According to the method and the system, residual heat of low-temperature flue gas can be recovered, and meanwhile dew point corrosion of the air preheater is eliminated.

Description

A kind of fuel heating furnace heat recovery method and system

Technical field

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

Background technology

Fuel heating furnace is the capital equipment of petroleum chemical industry, and its energy consumption accounting reaches enterprise and uses energy 40% left and right, 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 does not still wait up to 140~260 ℃, causes waste and the environmental pollution of the energy.And the dew point corrosion phenomenon of the interior air-coil of air preheater is serious, need often maintenance and change, also want the pumpback part air pre-mixing of preheating during operation, to improve inlet air temperature, reduce dew point corrosion.In addition, after former off-gas recovery, the air themperature of preheating is generally still on the low side, has increased fuel consumption.The heating furnace total amount of petroleum chemical enterprise is large, and fuel consumption is many, does not also have at present the correlation engineering technology to address this problem.

Summary of the invention

The invention provides a kind of fuel heating furnace heat recovery 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, the 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 described the first four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and chimney; Described the second four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and air blast; Described the first four-way change-over valve and the second four-way change-over valve connect respectively described driving cylinder; Described driving cylinder changes the phase place of described the 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 shell side and described first heat storage of described air preheater successively; Cold wind enters described the second heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater; Perhaps

High-temperature flue gas from described heating furnace enters described chimney by shell side and described second heat storage of described air preheater successively; Cold wind enters described the first 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 according to the described driving cylinder of exhaust gas temperature, gas component and flow-control, makes described the first four-way change-over valve of described driving air cylinder driven and the second four-way change-over valve.

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 heat recovery method, is applied to above-mentioned fuel heating furnace waste heat recycling system, and described method comprises:

Step 1: control described the 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 shell side and described first heat storage of described air preheater successively; Cold wind enters described the second 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 the 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 shell side and described second heat storage of described air preheater successively; Cold wind enters described the first 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 to 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 the described air preheater of 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 the described air preheater of preheating.

Further, when described the first four-way change-over valve and the commutation of the second four-way change-over valve, described the 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 speed, 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 satisfied first threshold of setting of exhaust gas temperature, coefficient of excess air and flow comprises: exhaust gas temperature is less than 105 ℃, and coefficient of excess air is less than 1.1.

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

The beneficial effect of the embodiment of the present invention is, there is no at present the low-temperature flue gas technique that reclaims 120 to 200 degree both at home and abroad, and fuel heating furnace waste heat recycling system of the present invention has realized that the low-temperature heat accumulating technology applies first in petroleum chemical heating furnace.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, has reduced energy resource consumption.Due to the raising of the air themperature that enters former air preheater, solved the dew point corrosion problem of air preheater.The air themperature that enters heating furnace significantly improves, and has improved 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.

The accompanying drawing explanation

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

The structural representation that Fig. 1 is former reheat furnace system;

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

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

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

The flow chart that Fig. 5 is embodiment of the present invention fuel heating furnace heat recovery method.

The specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.

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

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, the first four-way change-over valves 301, the 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 that the first heat storage 304 and the second heat storage 305, the first four-way change-over valves 301 are connected by pipeline respectively with the first heat storage 304, the second heat storage 305, air preheater 106 and chimney 102.

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

The first four-way change-over valve 301 and the second four-way change-over valve 302 connect respectively driving cylinder 303, drive cylinder 303 connecting PLC(Programmable Logic Controller, programmable logic controller (PLC)) (not shown).PLC drives cylinder 303 according to exhaust gas temperature, gas component and flow-control, makes to drive cylinder 303 to drive the first four-way change-over valve 301 and the second four-way change-over valve 302 commutations.Driving cylinder is pneumatic cylinder or electric cylinder, and specifically according to field condition, the operating process such as thermometric, temperature control, air blast, smoke evacuation, all regulate under control and automatically complete at PLC.Guaranteed that air and the exhaust gas temperature of heat storage holding, in exothermic process accurately is controlled in the scope of setting all the time, guaranteed that the constant temperature of flue gas is discharged.

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

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

When the first heat storage 304 advances the flue gas heat absorption, when the second heat storage 305 advances 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 conductings, and the flue gas pipeline between the first heat storage 304 and chimney 102 is by the first four-way change-over valve 301 conductings; Air pipe line between air blast 104 and the second heat storage 305 is by the second four-way change-over valve 302 conductings, 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 conductings.

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, coolings, 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, the second heat storage 305 release heat are by the cold wind preheating, become hot blast after preheating, after the tube side that enters 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 to make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutations under the control of PLC, enter the B state.In one embodiment, when exhaust gas temperature is less than 105 ℃, coefficient of excess air (gas component) while being less than 1.1, enter the B state.Gas flow can be set according to concrete operating mode, repeats no more.

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

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

In the 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, coolings, 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, the first heat storage 304 release heat are by the cold wind preheating, become hot blast after preheating, after the tube side that enters 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, drive cylinder 303 to make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutations under the control of PLC, return to A condition.In one embodiment, when exhaust gas temperature is less than 105 ℃, coefficient of excess air (gas component) while being less than 1.1, enter A condition.Gas flow can be set according to concrete operating mode, repeats no more.

Above-mentioned A, two states of B hocket, and pipeline and the first heat storage 304 and the interior medium of the second heat storage 305 (wind and flue gas) are the alternating current mistake.For two media phase mutual interference before and after avoiding, during commutation, the first four-way change-over valve 301 and the second four-way change-over valve 302 need the phase difference that keeps certain, time delay interval and the commutation cycle of the first four-way change-over valve 301 and the second four-way change-over valve 302, after needing to calculate according to indexs such as on-the-spot install pipeline, flow, flow velocity, exhaust gas temperatures, set.In one embodiment, phase difference t=f (alv), wherein, l is length of pipeline, v is medium speed, v=f (Q1, Q2), Q1, Q2 are respectively medium flue gas and air mass flow, and a is the medium incidence coefficient.

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

S501: control described the 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 shell side and described first heat storage of described air preheater successively; Cold wind enters described the second 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, and if so, carry out step S503, if not, continue to carry out S501.

S503: control described the 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 shell side and described second heat storage of described air preheater successively; Cold wind enters described the first 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, and if so, carry out step S501, if not, continue to carry out 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, coolings, 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, the second heat storage 305 release heat are by the cold wind preheating, become hot blast after preheating, after the tube side that enters 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 to make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutations under the control of PLC, 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, coolings, 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, the first heat storage 304 release heat are by the cold wind preheating, become hot blast after preheating, after the tube side that enters 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, drive cylinder 303 to make the first four-way change-over valve 301 and the second four-way change-over valve 302 commutations under the control of PLC, return to S501.

Above-mentioned A, two states of B hocket, and pipeline and the first heat storage 304 and the interior medium of the second heat storage 305 (wind and flue gas) are the alternating current mistake.For two media phase mutual interference before and after avoiding, during commutation, the first four-way change-over valve 301 and the second four-way change-over valve 302 need the phase difference that keeps certain, time delay interval and the commutation cycle of the first four-way change-over valve 301 and the second four-way change-over valve 302, after needing to calculate according to indexs such as on-the-spot install pipeline, flow, flow velocity, exhaust gas temperatures, set.In one embodiment, phase difference t=f (alv); Wherein, l is length of pipeline, and v is medium speed, 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 three kinds of ceramic honey comb, heat-storing sphere and heat accumulation pipes.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 more is conducive to realize 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, can arrange the burner of q.s, meet the thermic load needs.And the straight gas channel of ceramic honey comb is compared more difficult obstruction with the labyrinth passage of bead, self-cleaning is good, and unclean characteristics are applicable to burn.Corundum/mullite, the remarkable advantages such as that cordierite/mullite compound phase honeycomb ceramic heat accumulator has is high temperature resistant, anticorrosive, good thermal shock stability, intensity is high, the accumulation of heat heat large, good heat conductivity.Table 1 is ceramic honey comb performance indications (for the RCO catalyst carriers).

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

1, for every heating furnace applying heat accumulating type fuel heating furnace waste heat recycling system, on average can obtain energy-saving effect: save 985 ton/years of combustion gas, by 19083 ton/years of calculating of annual consumption combustion gas, combustion gas saving rate reaches 5.16%: add up to 6,900,000 yuan/year of the expenses capable of saving fuel that are total to.

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

Fuel heating furnace waste heat recycling system of the present invention possesses following advantage: there is no at present both at home and abroad the low-temperature flue gas technique that reclaims 120 to 200 degree, fuel heating furnace waste heat recycling system of the present invention has realized that the low-temperature heat accumulating technology applies first in petroleum chemical heating furnace.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, has reduced energy resource consumption.Due to the raising of the air themperature that enters former air preheater, solved the dew point corrosion problem of air preheater.The air themperature that enters heating furnace significantly improves, and has improved 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 complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect fully.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.

The present invention describes with reference to flow chart and/or the block diagram of method, equipment (system) and computer program according to the embodiment of the present invention.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.

These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction be stored in this computer-readable memory produce the manufacture that comprises command device, this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out on computer or other programmable devices is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

Applied specific embodiment in the present invention principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , 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 simultaneously.

Claims (10)

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, the 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 described the first four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and chimney; Described the second four-way change-over valve is connected respectively with the first heat storage, the second heat storage, air preheater and air blast; Described the first four-way change-over valve and the second four-way change-over valve connect respectively described driving cylinder;
Described driving cylinder changes the phase place of described the 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 shell side and described first heat storage of described air preheater successively; Cold wind enters described the second heat storage heating by air cleaner and air blast successively, and the hot blast after heating enters described heating furnace by described air preheater; Perhaps
High-temperature flue gas from described heating furnace enters described chimney by shell side and described second heat storage of described air preheater successively; Cold wind enters described the first 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 according to the described driving cylinder of exhaust gas temperature, gas component and flow-control, makes described the first four-way change-over valve of described driving air cylinder driven and the second four-way change-over valve.
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 heat recovery method, be applied to fuel heating furnace waste heat recycling system claimed in claim 1, it is characterized in that, described method comprises:
Step 1: control described the 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 shell side and described first heat storage of described air preheater successively; Cold wind enters described the second 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 the 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 shell side and described second heat storage of described air preheater successively; Cold wind enters described the first 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 to step 1.
6. fuel heating furnace heat recovery 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 the described air preheater of preheating.
7. fuel heating furnace heat recovery 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 the described air preheater of preheating.
8. fuel heating furnace heat recovery method according to claim 5, is characterized in that, when described the first four-way change-over valve and the commutation of the second four-way change-over valve, described the 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 speed, v=f (Q1, Q2), and Q1, Q2 are respectively medium flue gas and air mass flow, and a is incidence coefficient.
9. fuel heating furnace heat recovery method according to claim 5, is characterized in that, exhaust gas temperature, coefficient of excess air and flow meet the first threshold of setting and comprise: exhaust gas temperature is less than 105 ℃, and coefficient of excess air is less than 1.1.
10. fuel heating furnace heat recovery method according to claim 5, is characterized in that, exhaust gas temperature, coefficient of excess air and flow meet the Second Threshold of setting and comprise: exhaust gas temperature is less than 105 ℃, 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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CN104100993A (en) * 2014-06-19 2014-10-15 钟小葵 Reciprocating-type air preheater
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
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CN110529872A (en) * 2018-07-24 2019-12-03 青岛科技大学 Station boiler afterheat utilizing system based on entrance 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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JP2004190896A (en) * 2002-12-09 2004-07-08 Ngk Insulators Ltd White smoke preventive heat exchanging device
CN101358770A (en) * 2008-09-05 2009-02-04 江阴市石油化工设备有限公司 Method for utilizing flue gas low-temperature heat quantity for industrial furnace
CN201866788U (en) * 2010-11-29 2011-06-15 岳阳远大热能设备有限公司 Direct exchange type heat exchanger
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CN104100993A (en) * 2014-06-19 2014-10-15 钟小葵 Reciprocating-type air preheater
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CN105783019A (en) * 2015-01-12 2016-07-20 杭州富尔顿热能设备有限公司 Cyclonic inlet air filter and fluid heating systems and combustion burners having the same
CN110529872A (en) * 2018-07-24 2019-12-03 青岛科技大学 Station boiler afterheat utilizing system based on entrance flue gas temperature communication control
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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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