CN107923608A - Cogeneration systems - Google Patents

Cogeneration systems Download PDF

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Publication number
CN107923608A
CN107923608A CN201680046813.1A CN201680046813A CN107923608A CN 107923608 A CN107923608 A CN 107923608A CN 201680046813 A CN201680046813 A CN 201680046813A CN 107923608 A CN107923608 A CN 107923608A
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CN
China
Prior art keywords
heat
exhaust gas
heat exchanger
medium oil
temperature
Prior art date
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Granted
Application number
CN201680046813.1A
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Chinese (zh)
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CN107923608B (en
Inventor
藤原雅树
松寺直树
渡会毅
伊藤隆行
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Mitsubishi Heavy Industries Environmental and Chemical Engineering Co Ltd
Mitsubishi Heavy Industries Environmental Engineering Co Ltd
Original Assignee
Mitsubishi Heavy Industries Environmental Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to JP2015251539A priority Critical patent/JP6210241B2/en
Priority to JP2015-251539 priority
Application filed by Mitsubishi Heavy Industries Environmental Engineering Co Ltd filed Critical Mitsubishi Heavy Industries Environmental Engineering Co Ltd
Priority to PCT/JP2016/088047 priority patent/WO2017110848A1/en
Publication of CN107923608A publication Critical patent/CN107923608A/en
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Publication of CN107923608B publication Critical patent/CN107923608B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/04Control effected upon non-electric prime mover and dependent upon electric output value of the generator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/15004Preventing plume emission at chimney outlet
    • 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
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The present invention provides cogeneration systems (1), it has:Incinerator (2);The offgas line (5) to circulate for the exhaust gas (EG) discharged from incinerator (2);The power generator (3) that heat medium oil (HO) is generated electricity as heat source;The first heat exchanger (6) of heat exchange is carried out with the heat medium oil (HO) supplied to power generator (3) to exhaust gas (EG);It is arranged side by side in offgas line (5) with first heat exchanger (6) and carries out the air preheater (7) of heat exchange with the air (A1) supplied to incinerator to exhaust gas (EG);From the dust collect plant (14) for by first heat exchanger (6) and air preheater (7) remove solid constituent in the exhaust gas (EG) after heat exchange;And the upstream side of dust collect plant (14) is arranged in offgas line (5) and from first heat exchanger (6) and air preheater (7) carry out the second heat exchanger (8) of heat exchange to first heat exchanger (6) between the exhaust gas (EG) after heat exchange and the heat medium oil (HO) supplied.

Description

Cogeneration systems
Technical field
The present invention relates to the cogeneration systems that the waste heat using incinerator generates electricity.
The application CLAIM OF PRIORITY based on Japanese Patent Application filed in 24 days December in 2015 2015-251539, and This quotes its content.
Background technology
In the sludge incineration unit handled sludge such as downflow sludges, using the waste heat of incinerator to incinerator The combustion air of supply is preheated, or is generated electricity using the steam produced by the boiler of recycling waste heat.Thus, in sludge Burn in unit, improve the hot effective rate of utilization of unit entirety (referring for example to patent document 1.).
In such sludge incineration unit, the collection carried out from the dust processing of the exhaust gas of incinerator discharge is usually provided with Dirt device.In such sludge incineration unit, the heat resisting temperature based on dust collect plant, carries out the exhaust gas flowed into dust collect plant Temperature adjustment.In the past, sprayed water using exhaust gas cooling tower to the exhaust gas imported to dust collect plant in a manner of vaporific, by temperature tune It is whole to e.g., from about 200 DEG C.
Citation
Patent document
Patent document 1:Japanese Unexamined Patent Publication 2013-155974 publications
The content of the invention
The subject that the invention solves
However, when being adjusted being sprayed water to exhaust gas in a manner of vaporific into trip temperature, finally dissipate heat, be not preferred 's.In addition, temperature control also can be carried out by making air etc. be mixed with to the exhaust gas that dust collect plant imports.However, at this In method, in the same manner as exhaust gas cooling tower, heat finally is dissipated, be undesirable.In addition, it is necessary to the air of large capacity, is Reply gas flow is significantly increased, it is necessary to increase place capacity.
There is also setting gas regenerative air heater to carry out temperature controlled method, but has gas regenerative air heater Heat-transfer pipe easily become the problem of low-temperature corrosion region is such.
It is an object of the present invention in the cogeneration systems to be generated electricity using the waste heat of incinerator, there is provided a kind of The cogeneration systems of hot effective rate of utilization higher.
Solution
First method according to the present invention, cogeneration systems have:Incinerator;Offgas line, it is supplied from the incinerator The exhaust gas circulation of discharge;Power generator, it generates electricity heat medium oil as heat source;First heat exchanger, it is to the exhaust gas Heat exchange is carried out with the heat medium oil supplied to the power generator;Air preheater, it is in the offgas line with described first Heat exchanger is arranged side by side, and carries out heat exchange with the air supplied to the incinerator to the exhaust gas;Dust collect plant, its from Carried out removing solid constituent in the exhaust gas after heat exchange by the first heat exchanger and the air preheater;And the Two heat exchangers, it is arranged on the upstream side of the dust collect plant in the offgas line, and by the first heat exchanger And the air preheater carry out the exhaust gas after heat exchange and the heat medium oil that is supplied to the first heat exchanger it Between carry out heat exchange.
According to this structure, the temperature of the exhaust gas imported to dust collect plant is reduced by using second heat exchanger, Compared with for example reducing the situation of the temperature of exhaust gas using exhaust gas cooling tower, heat can be more efficiently utilized.
Or, possesses control device in above-mentioned cogeneration systems, which is based on from the described second heat The temperature of the exhaust gas of exchanger discharge, to adjust the flow for the heat medium oil that heat exchange is carried out by the second heat exchanger.
According to this structure, the temperature of exhaust gas is adjusted by adjusting the flow of heat medium oil, the temperature of exhaust gas can be made As temperature corresponding with the heat resisting temperature of dust collect plant.
Or, possess in above-mentioned cogeneration systems:Heat-carrying oil circulation path, it is circulated for heat medium oil;And Bypass path, it is in the heat-carrying oil circulation path by the upstream side of the second heat exchanger and the second heat exchanger Downstream connected in a manner of around the second heat exchanger, the control device is to flowing in the bypass path The flow of heat medium oil is adjusted.
Adjusted by using the flow of the heat medium oil of the second heat exchanger importing to the upstream side for being configured at dust collect plant The temperature of the whole exhaust gas flowed into dust collect plant, can more promptly adjust the temperature of exhaust gas.
In above-mentioned cogeneration systems or, based on by the first heat exchanger carry out heat exchange after institute The temperature of heat medium oil is stated, to adjust the flow velocity of the heat medium oil supplied to the power generator.
According to this structure, the temperature of heat medium oil can be adjusted to the temperature suitable for power generator.In addition, it can answer The temperature of exhaust gas in the case of to being significantly increased from the temperature for the exhaust gas that incinerator is discharged (heat) rises.In addition, it can answer The temperature of exhaust gas in the case of to being greatly decreased from the temperature for the exhaust gas that incinerator is discharged (heat) reduces.
Or, possesses anti-white cigarette device in above-mentioned cogeneration systems, which utilizes from the described second heat Exchanger, which is discharged, simultaneously heats extraneous air by the exhaust gas after the dust collect plant, and by the exhaust gas and described Extraneous air is supplied to chimney.
According to this structure, with for example compared with the situation of anti-white cigarette device is set on the upstream side than second heat exchanger, Heat is recycled from the exhaust gas of low temperature, therefore, it is possible to improve the heat recovery rate of system entirety.
Invention effect
According to the present invention, the temperature of the exhaust gas imported to dust collect plant is reduced by using second heat exchanger, with example Such as compared using exhaust gas cooling tower to reduce the temperature of exhaust gas, can more efficiently utilize heat.
Brief description of the drawings
Fig. 1 is the system diagram of the sludge incineration unit of embodiments of the present invention.
Fig. 2 is the flow chart that the first control method of the sludge incineration unit to embodiments of the present invention illustrates.
Fig. 3 is the flow chart that the second control method of the sludge incineration unit to embodiments of the present invention illustrates.
Embodiment
Hereinafter, cogeneration systems, that is, sludge incineration unit 1 of embodiments of the present invention is carried out in detail referring to the drawings Explanation.
As shown in Figure 1, the sludge incineration unit 1 of present embodiment possesses:Burnt to what the sludge such as downflow sludge S was burned Burn stove 2;The power generator 3 to be generated electricity using the waste heat (burning heat) of the exhaust gas EG discharged from incinerator 2;And control device 4.The sludge incineration unit 1 of present embodiment is to carry out burning disposal to sludge S and recycle the heat produced with burning to come The cogeneration systems to generate electricity.Power generator 3 uses the heat medium oil HO circulated in the unit as thermophore.
Sludge incineration unit 1 possesses:It is imported into the offgas line 5 of the exhaust gas EG discharged from incinerator 2;It is arranged on offgas line 5 On first heat exchanger 6;The air preheater 7 being arranged side by side in offgas line 5 with first heat exchanger 6;It is arranged on first The second heat exchanger 8 in the downstream of heat exchanger 6 and air preheater 7;And it is arranged on the downstream of second heat exchanger 8 Emission-control equipment 9.
In the upstream side of incinerator 2 sludge that sludge, that is, dewatered sludge comprising moisture is dried can also be set to do Dry machine.Sludge drier is the dewatered sludge (dewatered cake, such as aqueous for making to import by the volume reduction chemical industry skill for concentrating, being dehydrated Rate is 72%) the dry device for generating dry sludge (such as moisture content 50%).
First heat exchanger 6 and second heat exchanger 8 be to from the exhaust gas EG that incinerator 2 is discharged with being supplied to power generator 3 The heat medium oil HO given carries out the heat exchanger of heat exchange (heating).Air preheater 7 be to the exhaust gas EG that is discharged from incinerator 2 with The combustion air A1 supplied to incinerator 2 carries out the heat exchanger of heat exchange (preheating).
Emission-control equipment 9 has:Solid constituent (ash etc.) is removed from exhaust gas EG and carries out the dust collect plant of dust processing 14 (belt filters);Anti- white cigarette device 15;Exhaust gas EG is contacted with cleaning solution and carry out (the exhaust gas cleaning of innoxious gas cleaner 16 Device);And the chimney 17 for discharging the exhaust gas EG after processing to air.
Power generator 3 has power generator main body 11 and the ring-type for importing heat medium oil HO to power generator main body 11 Heat source system, that is, heat-carrying oil circulation path 12 (being shown in Fig. 1 using double dot dash line).Heat-carrying oil circulation path 12 is to make heat-carrying The path that oily HO is circulated between power generator main body 11 and first heat exchanger 6 and second heat exchanger 8.Heat medium oil HO is being carried Flowed in one direction in hot-oil circulation path 12.
Incinerator 2 is to make the equipment that it is burned by being stirred, mixing to sludge S in temperature flowing bed.Burn Stove 2 is that discarded object is burned and discharges the burning facility of the exhaust gas EG of high temperature.As incinerator 2, gas can be used The burning facilities such as alveolitoid flowing stove, circular form flowing stove.
Via combustion air line 13 (being shown in Fig. 1 using single dotted broken line) combustion air A1 (flowing skies are imported to incinerator 2 Gas).Exhaust gas EG is discharged from incinerator 2 via the first offgas line 5a.The temperature of the exhaust gas EG discharged from incinerator 2 is for example 850℃。
First offgas line 5a branches into two second offgas line 5b (5b1,562) being arranged side by side in downstream.One side's Second offgas line 5b1 is connected with first heat exchanger 6.First heat exchanger 6 is arranged on heat-carrying oil circulation path 12 and second On offgas line 5b1.First heat exchanger 6 is carried out as the heat of the exhaust gas EG of the high temperature to being flowed in the second offgas line 5b1 Recycle and heat the heating unit of heat medium oil HO and play function.
The second offgas line 562 of the opposing party is connected with air preheater 7.Air preheater 7 is in the second offgas line 562 The heat of the exhaust gas EG of the high temperature of middle flowing is recycled and heats the combustion air that (preheating) is flowed in combustion air line 13 The heat exchanger of A1.
First heat exchanger 6 is arranged side by side with air preheater 7 in offgas line 5.
Two second offgas line 5b collaborate in the downstream of first heat exchanger 6 and air preheater 7.Two second exhaust gas Line 5b is connected with the 3rd offgas line 5c.Second heat exchanger 8 is arranged on the downstream of first heat exchanger 6 and air preheater 7 I.e. on the 3rd offgas line 5c.After second heat exchanger 8 is used as to carrying out heat exchange by first heat exchanger 6 and air preheater 7 The heat of exhaust gas EG recycled and heat the heating unit of heat medium oil HO and play function.
Then, for the coal dust contained by the exhaust gas EG that will be discharged from incinerator 2, SO2, HCl etc. removes and useless as cleaning The emission-control equipment 9 of gas illustrates.
The dust collect plant 14 for being arranged at the downstream of second heat exchanger 8 is using filter cloth with heat resistance etc. and to useless The solid constituents such as coal dust, ash in gas EG carry out the device of filtering capture.That is, from being discharged from second heat exchanger 8 and via Four offgas line 5d imported into the exhaust gas EG of dust collect plant 14 and remove coal dust etc..
In dust collect plant 14, heat resisting temperature is set with for the temperature of imported exhaust gas EG.Dust collect plant 14 Heat resisting temperature is, for example, 220 DEG C.
The anti-white cigarette device 15 that the downstream of dust collect plant 14 is arranged in offgas line 5 is the white cigarette for preventing exhaust gas EG Device.Anti- white cigarette device 15 possesses:The air supply fan 19 for sucking air A2 and sending out;Make useless via the 5th from dust collect plant 14 Heat exchange is carried out between exhaust gas EG and air A2 that gas line 5e is imported, air A2 is heated and becomes and mixes with air A3's Air heater 20;And mixing is oriented to the mixing air line 21 of chimney 17 with air A3.
As the air heater 20 of anti-white cigarette device 15, such as shell and tube heat exchanger can be used.Air heater 20 Heat-transfer pipe for example by Teflon (registration mark) resistant material cover.In other words, connect in the exhaust gas of air heater 20 Contacting surface is formed with the anti-corrosion layer formed by Teflon.That is, the air heater 20 of present embodiment has low-temperature corrosion protection erosion type Heat-transfer pipe.
Corrosion thereby, it is possible to the metal surface for suppressing heat-transfer pipe, prevents low-temperature corrosion.For becoming anti-white cigarette device 15 The processing of low-temperature corrosion protection erosion type is not limited to above-mentioned Teflon, such as can also use the nonmetallic materials such as resin.In addition, Heat-transfer pipe itself can be formed by resistant materials such as ceramics.
Gas cleaner 16 is to make to discharge from anti-white cigarette device 15 and via the exhaust gas EG that the 6th offgas line 5f is imported and water, caustic soda The cleaning solutions such as aqueous solution contact and carry out innoxious exhaust gas cleaning device.
Exhaust gas EG in offgas line 5 is discharged by air-introduced machine attraction (not shown) via chimney 17.
In the 4th offgas line 5d for being connected second heat exchanger 8 with dust collect plant 14 of offgas line 5, be provided with to The exhaust gas temperature measurement device 18 that the temperature of the exhaust gas EG flowed in 4th offgas line 5d is measured.Exhaust gas temperature measurement device The temperature of 18 couples of exhaust gas EG flowed into dust collect plant 14 is measured.The exhaust gas EG measured by exhaust gas temperature measurement device 18 Temperature sent to control device 4.
Then, the detailed content of the power generator 3 of present embodiment is illustrated.
Power generator main body 11 uses and heats the waste heat of incinerator 2 to organic working media M as heat source and made It is evaporated, and makes so-called binary (binery) cogeneration systems that steamturbine 23 rotates and generate electricity using the steam (organic rankine cycle cogeneration systems).
The power generator main body 11 of present embodiment has:Using via heat-carrying oil circulation path 12 to power generator main body The evaporator 22 that the heat of the heat medium oil HO of 11 supplies heats organic working media M and evaporates it;Utilize organic work The steam for making medium M carries out rotating steamturbine 23;The generator 24 directly linked with steamturbine 23;And make from steam The condenser 25 for organic working media M condensations that turbine 23 imports.
Heat-carrying oil circulation path 12 be the heat of the exhaust gas EG to being flowed in the 3rd offgas line 5c recycled and to The path that the heat of the exhaust gas EG flowed in second offgas line 5b1 is recycled.
Heat-carrying oil circulation path 12 has:The first circulation road that power generator main body 11 is connected with second heat exchanger 8 Footpath 12a;The second circulation path 12b that second heat exchanger 8 is connected with first heat exchanger 6;And by first heat exchanger 6 The 3rd circulating path 12c being connected with power generator main body 11.
Heat medium oil HO after being heated in power generator main body 11 to organic working media M is according to second heat exchanger 8th, the sequential loop of first heat exchanger 6.First heat exchanger 6 is arranged at second heat exchanger in heat-carrying oil circulation path 12 8 downstream.
The heat medium oil HO that second heat exchanger 8 is imported into via first circulation path 12a is flowed in the 3rd offgas line 5c Dynamic exhaust gas EG heating.The heat medium oil HO of first heat exchanger 6 is imported into by the second offgas line via second circulation path 12b The exhaust gas EG heating flowed in 5b1.Heat medium oil HO after being heated by second heat exchanger 8 and first heat exchanger 6 is via the 3rd Circulating path 12c is imported to the evaporator 22 of power generator main body 11.
First circulation path 12a in the upstream side of second heat exchanger 8 and the downstream in second heat exchanger 8 Second circulation path 12b using bypass path 27b around second heat exchanger 8 and be directly connected.That is, on first circulation road A part of the heat medium oil HO flowed in the 12a of footpath does not import to second heat exchanger 8 and imported into bypass path 27b.
Set being arranged between the branch point 28 of bypass path 27b of first circulation path 12a and second heat exchanger 8 There is the first flow adjustment valve 29 being adjusted to the flow of heat medium oil HO.It is provided with bypass path 27b to heat medium oil HO's The second flow adjustment valve 30 that flow is adjusted.
On the 12a of first circulation path and branch point 28 upstream side, be provided with to being flowed in heat-carrying oil circulation path 12 The heat-carrying oil pump 31 that the flow of dynamic heat medium oil HO is adjusted.Heat-carrying oil pump 31 is to be used to supply to heat-carrying oil circulation path 12 The pump of heat medium oil HO.Heat-carrying oil pump 31 utilizes the stream of discharge damper or change-over switch (inverter) to the heat medium oil HO of discharge Amount is controlled.
First flow adjustment valve 29, second flow adjustment valve 30 and heat-carrying oil pump 31 are controlled by control device 4.
As the heat medium oil HO that will be flowed in the main path 27a of 28 downstream of branch point than first circulation path 12a Flow when being set to O1, the flow of the heat medium oil HO flowed in bypass path 27b being set to O2, control device 4 usually with into Valve 29 is adjusted to first flow for mode for O1: O2=4: 1 degree and second flow adjusts valve 30 and is controlled.That is, control Device 4 is so that the flow of the heat medium oil HO flowed in the main path 27a as mainstream is flowed far more than in bypass path 27b Heat medium oil HO flow mode to first flow adjust valve 29 and second flow adjustment valve 30 be controlled.
In the 3rd circulating path for being connected first heat exchanger 6 with power generator main body 11 of heat-carrying oil circulation path 12 In 12c, the heat medium oil temperature measuring that the temperature of the heat medium oil HO to being flowed in the 3rd circulating path 12c is measured is provided with Device 32.The temperature of heat medium oil HO of the heat medium oil temperature measuring apparatus 32 to being imported to power generator main body 11 is measured.By The temperature for the heat medium oil HO that heat medium oil temperature measuring apparatus 32 determines is sent to control device 4.
The control device 4 of present embodiment has the temperature based on the exhaust gas EG determined by exhaust gas temperature measurement device 18 And the function that the flow of the heat medium oil HO to being imported to second heat exchanger 8 is adjusted.
Control device 4 exhaust gas EG temperature be more than set first threshold (such as 220 DEG C) in the case of so that The flow of the heat medium oil HO of flowing becomes more modes in the main path 27a (downstream of branch point 28) of first circulation path 12a Valve 29 is adjusted to first flow and second flow adjustment valve 30 is controlled.Specifically, control device 4 is so that in bypass path The mode that the flow of the heat medium oil HO flowed in 27b tails off operates second flow adjustment valve 30, and so that in main road The mode that the flow of the heat medium oil HO flowed in the 27a of footpath becomes more operates first flow adjustment valve 29.
At this time, the flow of the overall heat medium oil HO of heat-carrying oil circulation path 12 is constant.That is, do not change in heat medium oil the circulation path The flow of the heat medium oil HO flowed in the entirety in footpath 12 and can increase to second heat exchanger 8 supply heat medium oil HO stream Amount.Thus, the heat exchange amount in second heat exchanger 8 rises, the Wen Duxiajiang of exhaust gas EG.
In addition, control device 4 have the temperature based on the heat medium oil HO determined by heat medium oil temperature measuring apparatus 32 and The function that the flow velocity of heat medium oil HO to being flowed in the entirety of heat-carrying oil circulation path 12 is adjusted.
Control device 4 heat medium oil HO temperature be more than set second threshold (such as 280 DEG C) in the case of so that The increased mode of flow velocity of the heat medium oil HO flowed in the entirety of heat-carrying oil circulation path 12 is controlled heat-carrying oil pump 31.
By the flow velocity increase of the overall heat medium oil HO of heat-carrying oil circulation path 12, so as to reduce the temperature of heat medium oil HO.
Then, the action of the sludge incineration unit 1 to present embodiment illustrates.
Sludge S is put to incinerator 2 and burns.With the exhaust gas EG (such as 850 DEG C) for burning and generating in the first heat It is used as the heating source of heat medium oil HO in exchanger 6.In addition, exhaust gas EG is used as the heating of combustion air A1 in air preheater 7 Source
The temperature for having passed through the exhaust gas EG of first heat exchanger 6 and air preheater 7 is reduced to such as 300 DEG C.That is, exhaust gas EG is from 850 DEG C of rapid coolings to 300 DEG C.
Then, exhaust gas EG is used as the heating source of thermophore in second heat exchanger 8.Second heat exchanger 8 is passed through The temperature of exhaust gas EG is reduced to 220 DEG C.That is, the temperature of exhaust gas EG is reduced to by carrying out heat exchange in second heat exchanger 8 The heat resisting temperature of dust collect plant 14.Imported by the exhaust gas EG after second heat exchanger 8 to dust collect plant 14.
Imported by the exhaust gas EG of second heat exchanger 8 to dust collect plant 14 to implement dust processing.
The exhaust gas EG discharged from dust collect plant 14 is in the air heater 20 of anti-white cigarette device 15 with supplying fan by air The air A2 of 19 supplies carries out heat exchange, the temperature of air A2 is increased.The temperature of air A2 rises to such as 150 DEG C.Pass through The mixing air A3 of air heater 20 is imported via mixing air line 21 to chimney 17.
Imported by the exhaust gas EG of anti-white cigarette device 15 to gas cleaner 16 innoxious to carry out.The temperature of exhaust gas EG is in net gas Desuperheat is to such as 40 DEG C in device 16.The exhaust gas EG for having passed through gas cleaner 16 is imported to chimney 17, and via mixing with air line 21 The mixing of the high temperature of importing is mixed with air A3.By the way that the mixing of exhaust gas EG and anti-white cigarette air A3 are mixed, Neng Goufang Only white cigarette is produced from chimney 17.
Then, the action to power generator 3 illustrates.
The heat medium oil HO circulated in heat-carrying oil circulation path 12 passes through in second heat exchanger 8 and first heat exchanger 6 In with exhaust gas EG carry out heat exchange and be warming up to such as 280 DEG C.Heat medium oil HO after heating is used for power generator main body 11 Organic working media M in evaporator 22 is heated.Organic working media M becomes steam in evaporator 22, and is imported into Generator 24 is driven to steamturbine 23.Steamturbine 23 discharge steam in condenser 25 it is cooled and cold It is solidifying.Condensed organic working media M returns to evaporator 22.
Then, the control method of the sludge incineration unit 1 to present embodiment illustrates.The sludge of present embodiment is burnt Burning the control method of unit 1 includes:The first control method that the temperature of exhaust gas EG to being imported to dust collect plant 14 is adjusted; And the second control method that the temperature of the heat medium oil HO to being imported to power generator main body 11 is adjusted.
First control method is that the flow of the heat medium oil HO to being imported to second heat exchanger 8 is controlled to adjust to collection The control method of the temperature for the exhaust gas EG that dirt device 14 imports.
First control method includes:Whether the temperature for the exhaust gas EG for judging to discharge from second heat exchanger 8 is more than the first threshold The exhaust gas temperature judgment process P11 of value;And it is more than first threshold in the temperature of the exhaust gas EG imported to second heat exchanger 8 In the case of, the increased main road run-off of flow for the heat medium oil HO for making to flow in the main path 27a of first circulation path 12a increases Process sequence P12.
In exhaust gas temperature judgment process P11, control device 4 is with reference to the exhaust gas EG sent from exhaust gas temperature measurement device 18 Temperature.Control device 4 judges whether the temperature of exhaust gas EG is more than first threshold (such as 220 DEG C).It is in the temperature of exhaust gas EG In the case of less than 220 DEG C, control device 4 does not change the aperture of valve 29,30.
In the case where the temperature of exhaust gas EG is more than 220 DEG C, control device 4 performs main road run-off increase process P12. In main road run-off increase process P12, control device 4 is adjusted the aperture of valve 29,30, makes to flow in main path 27a Heat medium oil HO flow increase.Thus, the heat exchange amount increase between exhaust gas EG and heat medium oil HO, the temperature drop of exhaust gas EG It is low.
On the other hand, in the case where the temperature of exhaust gas EG is low, control device 4 can also be implemented to adjust valve to first flow 29 and the aperture of second flow adjustment valve 30 could be adjusted to reduce the control of the flow of heat medium oil HO flowed in main path 27a System.
Second control method is that the flow of the heat medium oil HO to being flowed in 12 entirety of heat-carrying oil circulation path is controlled To adjust the control method of the flow velocity of the heat medium oil HO imported to power generator main body 11.
Second control method includes:Whether the temperature for the heat medium oil HO for judging to discharge from first heat exchanger 6 is more than second The heat-carrying oil temperature judgment process P21 of threshold value;And in the case where the temperature of heat medium oil HO is more than second threshold, make in heat-carrying The increased heat medium oil flow increase process P22 of flow velocity of the heat medium oil HO flowed in 12 entirety of oil circulation path.
In heat-carrying oil temperature judgment process P21, control device 4 is with reference to the load sent from heat medium oil temperature measuring apparatus 32 The temperature of deep fat HO.Control device 4 judges whether the temperature of heat medium oil HO is more than second threshold (such as 280 DEG C).In heat medium oil In the case that the temperature of HO is less than 280 DEG C, control device 4 does not change the delivery flow of heat-carrying oil pump 31.
In the case where the temperature of the heat medium oil HO discharged from first heat exchanger 6 is more than 280 DEG C, control device 4 performs Heat medium oil flow increase process P22.In heat medium oil flow increase process P22, discharge stream of the control device 4 to heat-carrying oil pump 31 Amount is adjusted, and makes the flow velocity increase of heat medium oil HO flowed in 12 entirety of heat-carrying oil circulation path.Thus, to power generator The temperature for the heat medium oil HO that main body 11 imports reduces.
On the other hand, in the case where the temperature of heat medium oil HO is low, control device 4 can also be implemented to heat-carrying oil pump 31 Delivery flow could be adjusted to reduce the control of the flow velocity of heat medium oil HO.
According to the above embodiment, the exhaust gas EG imported to dust collect plant 14 is reduced by using second heat exchanger 8 Temperature, compared with for example reducing the situation of the temperature of exhaust gas using exhaust gas cooling tower, can more efficiently utilize heat.
In addition, handed over by the temperature based on the exhaust gas EG determined by exhaust gas temperature measurement device 18 to adjust to the second heat The flow for the heat medium oil HO that parallel operation 8 imports, can make the temperature of exhaust gas EG become corresponding with the heat resisting temperature of dust collect plant 14 Temperature.
In addition, the heat medium oil HO by using the importing of second heat exchanger 8 to the upstream side for being configured at dust collect plant 14 Flow adjust the temperature of the exhaust gas EG flowed into dust collect plant 14, can more promptly adjust the temperature of exhaust gas EG.
In addition, by being adjusted based on the temperature that the heat medium oil HO after heat exchange is carried out by first heat exchanger 6 to power generation The temperature of heat medium oil HO, can be adjusted to the temperature suitable for power generator 3 by the flow velocity for the heat medium oil HO that apparatus main body 11 supplies. In addition, cope with from incinerator 2 discharge exhaust gas EG temperature (heat) be significantly increased in the case of exhaust gas EG temperature Rise.In addition, cope with from incinerator discharge exhaust gas temperature (heat) be greatly decreased in the case of exhaust gas temperature Reduce.
In addition, by possessing using carrying out heating backward chimney 17 to extraneous air by the exhaust gas EG after dust collect plant 14 The anti-white cigarette device 15 of supply, with for example compared with the situation of anti-white cigarette device is set on the upstream side than second heat exchanger 8, Neng Goucong The exhaust gas EG recycling heats of low temperature, therefore, it is possible to improve the heat recovery rate of system entirety.
In addition, by the way that anti-white cigarette device 15 is set to low-temperature corrosion protection erosion type, even if being less than 200 DEG C useless to such as temperature In the case that the temperature of gas EG is recycled, anti-white cigarette device 15 can also prevent sulphur (S) component or chlorine (Cl) component because of sludge Caused by metal low-temperature corrosion.
In addition, heat medium oil HO is used as the thermophore used in the recuperation of heat from waste heat source, that is, exhaust gas EG, by This can realize simplification, the miniaturization of unit compared with the situation of steam etc. is used in recuperation of heat.
In addition, by using binary cogeneration systems as power generator 3, even if unit small scale (for example, dirty Mud treating capacity 100t/ days) in the case of, power generation can also be effectively performed.
More than, embodiments of the present invention are illustrated in detail, but in the model for the technological thought for not departing from the present invention It can be subject to various changes in enclosing.
For example, in the case where the cigarette discharged from chimney 17 can also be white cigarette, anti-white cigarette device 15 can also be omitted.
In addition, control device 4 can also perform the first control method and the second control method at the same time.It is useless by controlling at the same time Temperature degree and heat-carrying temperature, can utilize cooperative effect and accelerate mutual response, as a result, can accelerate convergent Speed.
Description of reference numerals:
1 sludge incineration unit (cogeneration systems);
2 incinerators;
3 power generator;
4 control devices;
5 offgas lines;
6 first heat exchangers;
7 air preheaters;
8 second heat exchangers;
9 emission-control equipments;
11 power generator main bodys;
12 heat-carrying oil circulation paths;
12a first circulations path;
12b second circulations path;
The 3rd circulating paths of 12c;
13 combustion air lines;
14 dust collect plants;
15 anti-white cigarette devices;
16 gas cleaners;
17 chimneys;
18 exhaust gas temperature measurement devices;
19 air supply fan;
20 air heaters;
21 mixing air lines;
22 evaporators;
23 steamturbines;
24 generators;
25 condensers;
27a main paths;
27b bypass paths;
28 branch points;
29 first flows adjust valve;
30 second flows adjust valve;
31 heat-carrying oil pumps;
32 heat medium oil temperature measuring apparatus;
A1 combustion airs;
A2 air;
EG exhaust gas;
HO heat medium oils;
The organic working medias of M;
S sludge.

Claims (5)

1. a kind of cogeneration systems, wherein,
The cogeneration systems have:
Incinerator;
Offgas line, it is for the exhaust gas circulation from incinerator discharge;
Power generator, it generates electricity heat medium oil as heat source;
First heat exchanger, it carries out heat exchange to the exhaust gas with the heat medium oil supplied to the power generator;
Air preheater, it is arranged side by side in the offgas line with the first heat exchanger, and to the exhaust gas with to institute The air for stating incinerator supply carries out heat exchange;
Dust collect plant, it is carried out in the exhaust gas after heat exchange from by the first heat exchanger and the air preheater Except solid constituent;And
Second heat exchanger, it is arranged on the upstream side of the dust collect plant in the offgas line, and by the described first heat Exchanger and the air preheater carry out the exhaust gas after heat exchange and the load supplied to the first heat exchanger Heat exchange is carried out between deep fat.
2. cogeneration systems according to claim 1, wherein,
The cogeneration systems possess control device, and the control device is described useless based on being discharged from the second heat exchanger The temperature of gas, to adjust the flow for the heat medium oil that heat exchange is carried out by the second heat exchanger.
3. cogeneration systems according to claim 2, wherein,
The cogeneration systems possess:
Heat-carrying oil circulation path, it is circulated for heat medium oil;And
Bypass path, it hands over the upstream side of the second heat exchanger and the described second heat in the heat-carrying oil circulation path The downstream of parallel operation connects in a manner of around the second heat exchanger,
The flow of heat medium oil of the control device to being flowed in the bypass path is adjusted.
4. cogeneration systems according to any one of claim 1 to 3, wherein,
Based on the temperature that the heat medium oil after heat exchange is carried out by the first heat exchanger, to adjust to the power generator The flow velocity of the heat medium oil of supply.
5. cogeneration systems according to any one of claim 1 to 4, wherein,
The cogeneration systems possess anti-white cigarette device, which utilizes and discharged from the second heat exchanger and pass through institute State the exhaust gas after dust collect plant to heat extraneous air, and the exhaust gas and the extraneous air are supplied to chimney Give.
CN201680046813.1A 2015-12-24 2016-12-21 Cogeneration systems Active CN107923608B (en)

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