CN110030548A - A kind of the modularization heat-exchange method and device of particularly suitable biomass combustion system - Google Patents
A kind of the modularization heat-exchange method and device of particularly suitable biomass combustion system Download PDFInfo
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- CN110030548A CN110030548A CN201910297070.0A CN201910297070A CN110030548A CN 110030548 A CN110030548 A CN 110030548A CN 201910297070 A CN201910297070 A CN 201910297070A CN 110030548 A CN110030548 A CN 110030548A
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- heat
- heat exchange
- flue gas
- exchange module
- air
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 16
- 239000002028 Biomass Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000003546 flue gas Substances 0.000 claims abstract description 61
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000010902 straw Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 11
- 230000009970 fire resistant effect Effects 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 abstract description 21
- 238000013461 design Methods 0.000 abstract description 12
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 235000013339 cereals Nutrition 0.000 description 11
- 239000002609 medium Substances 0.000 description 9
- 238000012546 transfer Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 2
- 229910001950 potassium oxide Inorganic materials 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 208000035126 Facies Diseases 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- AEDZKIACDBYJLQ-UHFFFAOYSA-N ethane-1,2-diol;hydrate Chemical compound O.OCCO AEDZKIACDBYJLQ-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012120 mounting media Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004801 process automation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
Abstract
The present invention relates to a kind of modularization heat-exchange method of particularly suitable biomass combustion system and devices.It includes several standardization heat exchange modules that various heat-carrying agent mediums can be used.Flue gas (6) flowing, heat exchanger tube (8) in heat exchanger tube (8) is coaxially arranged between various heat exchange module.This makes each heat exchange module at runtime and can be used compressed air cleaning spray guns (30) effectively to clean the dust on heat exchanger tube.Since dust purification must no longer be realized by the high flow rate of flue gas (6), so that the power demand for reducing velocity of flue gas and attenuating air-introduced machine is possibly realized.The present invention is especially suitable for the construction that hot air system is generated by indirect heating, such as grain dry when expeditiously to generate 100 DEG C or more of hot-air.Heat-exchanger rig can according to need the size that can also design heat-exchanger rig as needed along horizontal or vertical direction arrangement and length and realize very good performance.
Description
Technical field
The present invention relates to a kind of modularization heat-exchange method of particularly suitable biomass combustion system and devices, this device is by several
A heat exchange module is combined into a heat-exchanger rig, and the present invention can be used to change for different thermal powers and different thermal mediums
Thermal design.The heat exchange module can be used for hot water heating, can also heat multiple heat carriers including hot oil simultaneously and be situated between
Matter.Special example application is that air is made to be more than 100 DEG C and be used for grain dry by indirect heating.
Background technique
Flue gas in coal-fired steam boiler Tube Sheet of Heat Exchanger is typically designed as flow at high speed to prevent dust stratification in pipe.Coal combustion produces
Include mineral composition in raw relatively large dust particles, is mostly that fusing point is higher, salt with rubbing action, is conducive to change
The purification of heat pipe.The flue gas of coal-burning boiler is transmitted with moving than actually required higher turbulent velocity with the heat obtained, this
It is why its air-introduced machine is frequently necessary to consume biggish electric energy.
The nanoscale fine dust that straw burning generates does not have friction clean-up effect, generally has charge and can be attached to
Metal surface, can be such in flue gas high-speed motion.Such as on the fan wing that revolving speed is up to 2800 revs/min of blower
Dust layer can be deposited, and this phenomenon is then rare when using coal as fuel.
Up to the present, the effective cleaning that can well solve heat exchanger surface there are no a kind of straw burning system is asked
It inscribes and designs suitable structure member.Heat exchange module is integrated into heat-exchanger rig, by the simplified modularization heat-exchanger rig of design
Mass is carried out with low price and standardization manufacture also has no which country has practical application at.
The hot wind of traditional heat exchangers is general only to occur heat exchange with a kind of medium, and not yet discovery is acted on using a kind of hot air source
Realize the practical application of heat exchange simultaneously in several different media.
In feed and food processing field, there are many heat blowers of indirect heating to be used for dried plant, grain-drying
The dried object in bulk such as equipment, especially corn generally requires the enhanced type heat source that drying air themperature can be more than 100 DEG C.And handle
Full combustion, the clean dry air of discharge be directly used in it is dry implement it is opposite be easy for it is more.
If making of biomass must generally use steam or conduction oil contour when fuel carries out indirect heating with heat exchanger
Warm, build and operation then more than one simple 95 DEG C of hot-water boiler with pressure wants costly and complicated more.Cereal is dry
Dry is mostly seasonal production, and operator is difficult the ability or qualification that have steam boiler complicated for operation completely.Hot oil medium ratio
Costly, easy to aging and easy risk is caused to environment.
On the other hand, the common therrmodynamic system based on fire coal with flue gas by heat exchange come to air heat when, it is past
It is past excessively high so that the thermal efficiency is not high enough since exhaust temperature is discharged.
Often there are the danger of hot plugging plug and heat-transfer surface damage, meeting when heat exchanger damages in the heat exchanger being made of heat-resisting steels
There is open fire to enter crop dryer and may cause fire.And since stalk flame is especially long, so the stalk particle being burning
A possibility that causing grain drying that fire occurs, is bigger.But if because this characteristic of stalk fuel reduces its burning temperature
Degree, then the adequacy and efficiency of straw burning can decline again.It can take more dust to heat exchanger with coal facies than straw burning,
These dust will become difficult to remove when being attached to heat exchanger in conjunction with unburned remaining carbon compound.Therefore stalk is clear
Clean and full combustion be it is vital, but such abundant cleaning burning be when ignition temperature is lower than 800 DEG C cannot
Ensure to fully achieve.
In addition the chlorine in stalk has stronger corrosiveness, it will usually produce bigger effect to the performance of steel.So
Up to the present it is not yet common that the intensive grain dry of energy satisfaction is made of biomass, particularly stalk in agricultural.
It is worldwide very universal to the device of grain dry that mode is directly heated with natural gas or liquefied gas, but cost
It is expensive.Fuel oil can also be used to carry out directly or indirectly (being largely illegal) drying, and what it is using coal can only be then indirectly dry
It is dry.Also do not allow in many countries with biomass convection drying cereal.
Summary of the invention
It is primary that the attachment dust on heat exchanging device surface, which carries out simple, economic cleaning, in straw burning system building
It is most important task.Because even if flue gas flow at high speed can not prevent completely dust to adhere to, heat exchanger dust purification
There is an urgent need to a kind of low energy consumption, the construction design concept being easily achieved.
The present invention can heat simultaneously several different heat-carrying agent mediums in the case where only one flue gas stream, then may be used
These different thermal mediums are applied in combination to realize purpose of design.
The design of the heat exchange module of different thermal mediums should be able to be standardized and perfectly be combined, in this way can be real well
Existing automated production is to realize low cost manufacturing.
In present invention application, it may be implemented without using heat-resisting steels, not using vapor or heat using stalk as fuel
The high temperature thermal mediums such as oil simultaneously generate the hot-air that temperature is more than 100 DEG C by indirect heating.Its energy conversion efficiency height, fire wind
Danger substantially reduces, and the thermal energy burden that various construction materials undertake will not be excessive.
For the producer, do not need critically important to the costly and complicated monitoring of hot air generator progress yet.
Object of the present invention is to realize heat exchange purpose by several heat exchange module comprising modules heat-exchanger rigs, these are changed
There is coaxial heat exchanger tube that the flue gas generated by straw burning system can be allowed to flow through between thermal modules.
In the modularization heat-exchanger rig, various heat exchange caliber, different pipes have been needed to configure according to the performance of different hot propertys
Long heat exchanger tube, the heat exchanger tube of all heat exchange modules are all arranged in co-axial alignment arrangements.Therefore, heat exchange module can be put vertically
It sets, can also be horizontally arranged each other, flue gas flows through all heat exchange modules in a linear fashion.
This structure allow by compressed air completely by all heat exchange modules heat exchange pipe internal surface dust into
Row cleaning, such dust separation is just no longer undertaken by flue gas stream, therefore can reduce velocity of flue gas, can be reduced for blower
Energy consumption, while heat exchanger size can be controlled as needed again.
Heat exchange module can design for different thermal mediums, and thermal medium can be the liquid such as water-ethylene glycol mixture or hot oil,
It can be the gases such as air, this allows various heat exchange module to heat multiple heat media simultaneously.
If only heating aqueous medium when can also several standard heat exchange modules are perpendicular to one another or parallel arrangement, in this way can be with
Reduce heat-exchanger rig production cost.
If allowing the flue gas of heat-exchanger rig first by using conduction oil or air as the heat exchange module of medium, in order to reach
To lower discharge flue-gas temperature can follow one using water as the heat exchange module of medium.
If necessary to output it is more than 100 DEG C of hot-air, such as grain dry etc., can arranges 3 according to the present invention
The above different heat exchange module combines to complete.Flue gas flows through gas-water heat exchange module first, and flue-gas temperature is down to steel can
Initial cold air can be preheated to about 65 hereinafter, changing thermogenetic 90 DEG C of hot water and flowing through Air-Water heat exchange module by 680 DEG C born
DEG C, pre-add stream of hot air is further heated to required temperature, such as 115 DEG C after flue gas-air heat exchange module.
To improve efficiency, flue gas-air heat exchange module can be switched to another gas-water heat exchange module, because of its unit
The heat-transfer capability of area is higher than flue gas-air heat exchange module, can get lower exhaust emissions temperature.Temperature when grain dry in winter
Lower area is spent, second gas-water heat exchange module can also be substituted with flue gas-air heat exchange module.Modularization heat exchange dress
Setting allows producer to carry out structure design according to heat-exchanger rig location feature.
By reducing the flue-gas temperature in first gas-water module, manufactured in next flue gas-air heat exchange module
When there is no need to use special high price high-temperature-resistant steel.
The dust that coal burning generates contains salt oxide, general poorly water-soluble and fusing point is higher than 1000 DEG C more.Cause
This coal combustion is little in the risk that heat-exchanger rig surface forms melting zone.And the major part of its dust is water-soluble in straw burning
Property salt oxide can be greatly melted in lower temperature in these oxides, such as fusing point is 340 DEG C of phosphorous oxides
Or fusing point only has 334 DEG C of potassium nitrate, but the potassium oxide etc. for being also simultaneously 770 DEG C comprising fusing point in the dust of straw burning,
Potassium oxide etc. is completely melt, needs higher temperature.
Because the heat exchanger tube temperature of general steam boiler rarely exceeds 300 DEG C, thus do not have when straw burning dust fusing and
Form the danger of solid layer.However in flue gas-air-flue gas exchange, heat exchange steel tube temperature is higher, such as flue-gas temperature 900
DEG C, 100 DEG C of air themperature when heat exchange steel tube temperature may reach 500 DEG C.And this temperature has been for ordinary steel
It is too high, so there are problems that melting the risk that mineral cause.So flue-gas temperature is controlled to 680 DEG C or less in straw burning
Be it is necessary, may insure heat exchange steel tube temperature in this way lower than 400 DEG C, this is that steel pipe is able to bear and mineral is avoided to melt
Temperature.
For safety reply flue gas input temp is monitored, it may be necessary to cold by being added in whirlwind after-burner
Air so that reduce flue-gas temperature in time.
The pouring-in heat exchanger module of flue gas is connected with each other, they can mutually mounted on top make flue gas perpendicular flow, or
Mutually make flue gas bottom horizontal flow sheet in tandem.All heat exchanger tubes are all coaxially arranged in alignment each other.
When flue-gas temperature reduces to keep flue gas flow rate, heat exchanger tube can be allowed straight as the usual practice of steam boiler
Diameter is gradually reduced with flow of flue gas direction.
By selecting heat exchanger tube diameter to may be implemented to change a bit of front that can be inserted of rear heat exchange module heat exchanger tube
In the heat exchanger tube of thermal modules.
Hot water from gas-water heat exchange module can be pumped into water-air heat exchange module.
In the present invention is implemented, heat exchange tube passage, sealing cover or fire resistant doorsets packet can be entered by sealing cover or fire resistant doorsets
Contain the device that compressed ir spray gun cleaning flue gases side heat-transfer surface can be used during system is run.Sealing cover or fire resistant doorsets packet
Contain fire resisting inner cover and the sealing external cover for being arranged in top.Sealing cover or fire resistant doorsets can be opened upwards or to side to discharge inside
Pressure discharges interior external pressure easily to complete this operation firstly the need of by a small vent flap on lid on opening
Difference.
There is conduit to be arranged therein in inner cover to be connected with heat exchanger tube, it can be square by conduit hand-held compressed ir spray gun
Just it is inserted into heat exchanger tube, can be removed from heat exchanger tube by injection compression air-borne dust.
Since using water as thermal medium, there are frost risks, so if necessity can add antifreezing agent, water circulation into water
Must closed operation with prevent as evaporation caused by water lack.Aqueous medium keeps pressing just as car engine cooling system
Power is less than 0.1MPa, can thus exempt the anxiety of pressure monitoring.
If pressure is up to 0.6MPa as solar energy system, temperature is also at 100 DEG C or more, although this can compensate drop
Low heat transfer potential, but have to comply with higher Legal Regulation requirement.
Detailed description of the invention
Fig. 1 is the heat-exchanger rig side view for generating hot water
Fig. 2 is the vertical type heat-exchanger rig side view for generating hot-air
Fig. 3 is heat-exchanger rig birds-eye view according to fig. 2.
Fig. 4 is available with compressed air and completes clean upper cover interior design
Fig. 5 is the circulating heat-exchanger rig birds-eye view for generating hot wind
Fig. 6 is the heat-exchanger rig sectional view according to Fig. 5
Fig. 7 is to supply birds-eye view according to the flue gas of the heat-exchanger rig of Fig. 5
Fig. 8 is the heat exchange module sectional view with heat exchanger tube
In figure: 1- gas-water heat exchange module, 2- gas-water heat exchange module, 3- gas-water heat exchange module, 4- flue gas enter
End, 5- flue gas release end, 6- flue gas, 7- discharge exhaust gas, 8- heat exchanger tube, 9- stretch ring, 10- sealing material, 11- gas-water change
Thermal modules, 12- flue gas-air heat exchange module, 13- gas-water heat exchange module, 14- pump, 15- water-air heat exchange module, 16-
Pump, 17- water-air heat exchange module, 18- air, 19- aerofoil fan, 20- air, 21- straw burning system, 22- straw bundle,
23- stalk loading attachment, 24- whirlwind after-burner, 25- dust storage chamber, 26- air-introduced machine, 27- chimney, 28- inner cover, 29- guidance
Pipe, 30- compressed air cleaning spray guns, 31- upper cover, 32- ventilation valve block, 33- gas-water heat exchange module, 34- flue gas-air change
Thermal modules, 35- flue gas-air heat exchange module, 36- water-air heat exchange module, 37- pump, 38- pipeline, 39- wind deflector, 40- steel
Structure room, 41- insulating layer, 42- fire resistant doorsets, 43- temperature sensor, the automatically controlled air register of 44-, 45- safety reverse turning bed, 46- electromagnetism
Iron, 47- mineral wool, 48- have a point support plate for wind effect, and 49- is without the support plate for dividing wind to act on, 50- end socket support plate, 51- end socket
Support plate.
Specific embodiment
According to Fig. 1, the heat-exchanger rig for being only used for generating hot water is presented.It is by independent gas-water heat exchange module
(1,2,3) and flue gas upstream end (4) and flue gas release end (5) composition.Flue gas (6) enters flue gas upstream end (4) and as row
Exhaust gas (7) leaves flue gas release end (5) out.Gas-water heat exchange module (1,2,3) includes the heat exchanger tube (8) of different-diameter, heat exchange
The diameter of pipe (8) becomes smaller in next heat exchange module along flow of flue gas direction, the heat exchanger tube of next heat exchange module (2,3)
(8) it can be inserted a bit of in the heat exchanger tube of a heat exchange module (1,2).
Heat exchange module (1,2,3) by with sealing material (10) stretch ring (9) be connected to each other and be connected to flue gas into
Enter end (4) and flue gas release end (5).
Vertically being stacked for this heat exchange module (1,2,3) needs to build the height that flue gas can be allowed to stop for a long time
Big whirlwind after-burner (24).Operator can use compressed air cleaning spray guns (30) from top as shown in Figure 4
Convenient exchange heat pipe (8) is cleaned.
Here it only proposes a kind of heat-exchanger rig for being used in particular for generating hot water, is all made of, manufactures simple component
Process automation easy to accomplish and standardization, and all these reductions for being all conducive to manufacturing cost.
What is expressed in Fig. 2 is the heat-exchanger rig that hot-air is generated by indirect heating, such as grain dry.This
Device includes 3 heat exchange modules (11,12,13) for allowing flue gas (6) to flow through.Wherein first is gas-water heat exchange module (11),
It only has short heat exchanger tube (8).Second is flue gas-air heat exchange module (12), and third is another gas-water heat exchange mould
Block (13).The heat exchanger tube diameter of each heat exchange module is gradually reduced to keep sufficiently high gas turbulence speed good to realize
Heat transmitting.
The warm water of heat exchange module (11) is sent into water-air heat exchange module (15) according to design by pump (14).Heat exchange module
(12) hot water is sent to water-air heat exchange module (17) by pumping (16).Cold air (18) stream being sent into from aerofoil fan (19)
Through heat exchange module (15,17) and 70 DEG C or more are heated to, the hot-air continues flow through flue gas-air heat exchange module (12) later
And reach after temperature higher than 100 DEG C as dry air (20).
Whole system is only made of ordinary steel.The maximum operating temperature of low-pressure water as heat-carrying agent medium is not higher than 95
DEG C, therefore pressure need not be monitored according to law.When even hot air temperature is more than 100 DEG C, but because do not come from
The substance of high temperature does not need so just forming the risk of flue dust coating not on heat exchanger surface using expensive height yet
Warm mounting medium.
The heat exchanger of modular construction is suitable for high-volume, low cost production.
Fig. 3 is from depression angle to system further progress explanation.The sectional view of heat exchange module (12) is demonstrated by heat exchanger tube
(8), flue gas (6) comes from straw burning system (21), and straw bundle (22) is put into straw burning system with stalk loading attachment (23)
It unites (21).Flue gas (6) enters whirlwind after-burner (24) and completes cleaning burning, can safely prevent tar or carbon from existing in this way
Deposition on heat exchanger tube.
Discharge exhaust gas (7) leaves heat exchange module (12) into dust storage chamber (25), is then sent into chimney through air-introduced machine (26)
(27).The speed of air-introduced machine (26) can meet user's needs, especially grain drying machine by frequency conversion control.According to correlation
Standard can also be by changing the velocity of flue gas optimization of system config in heat exchanger tube (8) to realize best heat transfer.
Fig. 4 performance is how to implement to clear up from the dust deposit of flue gas upstream end (4) top exchange heat pipe (8).It is interior
It covers (28) and is furnished with guiding tube (29), compressed air cleaning spray guns (30) can be properly inserted by guiding tube (29) by heat exchanger tube
(8) in.It opens sealing upper cover (31) and enters inner cover (28) area, but must first open vent flap before opening sealing upper cover (31)
(32) to release stress.System is that operator is provided with workbench, and this arrangement allows to pass through very much when systems stay is run
The complete cleaning of realization exchange heat pipe (8) of Ji.
Heat exchanger tube cleaning problems are solved in this way, and the design of heat exchanger tube and heat-transfer surface only needs to surround how to realize
Good heat transmitting is to carry out, and flue gas stream itself no longer needs to undertake clean up task, so the speed of flue gas stream can be significantly reduced
Degree, to significantly reduce the pressure loss of system and the electric power consumption of air-introduced machine.
However when heat-exchange system needs higher performance, just there is certain limitation with the arrangement of Fig. 3 according to fig. 2
Property.Vertically arranged heat-exchanger rig may will become too high, and straw burning is also required for 2 continuous whirlwind after-burners
(24), flue gas (6) may will become is admitted in subaerial bottom, is at this time then more suitable for using big horizontal heat exchange
Block combiner.
Fig. 5 illustrates this horizontal heat-exchanger rig, and be located at the area I is gas-water heat exchange module (33), positioned at the area II
It is flue gas-air heat exchange module (34), what it is positioned at the area III is 2 parts, and one is flue gas-air heat exchange module (35), another
A is water-air heat exchange module (36), and water-air heat exchange module (36) is connected to gas-water by pump (37) and pipeline (38)
Heat exchange module (33).Flue gas, which enters after heat-exchanger rig, is directed across a point support plate (48) and nothing for wind effect through wind deflector (39)
The support plate (49) for dividing wind effect, the effect of the support plate (49) for support plate (48) the He Wufen wind effect for dividing wind to act on are branch
It supports heat exchanger tube (8) and overcomes vibration of the flue gas by heat exchanger tube (8) when.
This only one water of arrangement circulation, especially suitable for a Nian Zhongyou half be winter and in winter when complete big portion
Divide the cold area of grain dry.General perishing air is only just able to achieve when inefficient gas-gas exchanges heat sufficiently low
Exhaust emissions temperature.Air (18) can pass through flue gas-air by wind deflector (39) guidance after entering heat exchange module (35)
Heat exchange module (35), while can also pass twice through water-air heat exchange module (36), at this time already close to 70 DEG C air again repeatedly
Across flue gas-air heat exchange module (34) and institute's calorific requirement is received, temperature can reach 120 DEG C.
According to Fig.6, it can be seen that the heat exchange module cross section from the cross section of flue gas-air heat exchange module (34)
It is rectangle, air (20) horizontally passes through heat-exchanging tube bundle.Entire heat exchange module is all gone along with sb. to guard him by steel construction room (40), steel knot
Structure room has a thick insulation layer (41) to be used to reduce thermal losses.
It is that flue gas is generated with the heating power of 3300kW in this application, flue gas-air heat exchange module (34,35) portion arrangement
Having 162 root long degree is the heat exchanger tube of 6m, and wherein the heat exchanger tube diameter of heat exchange module (34) is 108mm, and heat exchange module (35) are changed
Heat pipe diameter is 89mm.
Flue gas (6) are demonstrated by more detail in Fig. 7 into gas-water heat exchange module (33), are guided with burnisher
It manages the fire resistant doorsets (42) of (29) and has the sealing upper cover (31) of vent flap (32).
In order to safely prevent overheating, in the last channel being provided with for sucking fresh air of whirlwind after-burner.
For control accurate flue gas (6) temperature, setting one has the control device of temperature sensor (43), which allows to lead to
Automatically controlled air register (44) sucking fresh air is crossed with cooled flue gas (6).
In addition there are the safety reverse turning beds (45) that one has electromagnet (46), it extremely overheats in system or when power failure
It can fall automatically and introduce cold air.
Fig. 8 illustrates the sectional view of two heat exchange module engaging portions.Rear heat exchange module heat exchanger tube (8) is supported across end socket
Plate (50) is inserted into front heat exchange module and passes through a bit of in the heat exchanger tube of end socket support plate (51), two heat exchange module end socket supports
Plate is filled with mineral wool (47) between (50,51) in the pre-assembly.
Antifreezing agent can be added in heat transfer medium water according to dosage, but must examine when calculating and interpreting all system units
Consider the variation of mobility caused by addition antifreezing agent, heat transmitting and heat transfer potential.
When the present invention is implemented, the facilities such as all about air administrative, water expansion, thermal expansion, sealing and speed controlled pump
It can be achieved in good engineering practice.
This heat-exchanger rig is completely suitable for using stalk as fuel, it can almost be built by any size.It is all
Component is all easy to produce and process, is not necessarily to expensive material.Required heat medium temperature can be obtained, safely almost without technology wind
Danger, can be against supervision, and personnel can operate without many trainings are received, and long product lifecycle, low cost.
Claims (8)
1. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system, comprising heat exchanger tube, heat-carrying agent medium,
Pump and pipeline, blower etc., the flue gas (6) that straw burning system generates flow into the heat exchanger tube (8) of heat exchange module and by support plate
(48,49) fixed, wherein air conducting is completed in support plate (48) and wind deflector (39) cooperation；It is characterized in that, different heat exchange
Module (1,2,3,11,12,13,33,34,35) can be mutually coaxially connected with the heat exchanger tube (8) of identical quantity and be linearly arranged
Column.
2. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 1,
It is characterized in that, heat exchange module can be designed to heat different thermal mediums.
3. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 1,
It is characterized in that, flue gas upstream end (4) is arranged in heat-exchanger rig leading portion, and flue gas release end (5) is arranged in heat-exchanger rig back segment.
4. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 1,
It is characterized in that, heat exchanger tube (8) diameter of rear heat exchange module can become smaller, so that the heat exchange of front heat exchange module can be inserted in they
It is a bit of in pipe.
5. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 1,
It is characterized in that, flue gas upstream end (4) can be entered by sealing upper cover (31), inner cover (28) or fire resistant doorsets (42).
6. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 3,
It is characterized in that, sealing upper cover (31) includes a vent flap (32).
7. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 3,
It is characterized in that, inner cover (28) or fire resistant doorsets (42) include the guiding tube (29) for being inserted into compressed air cleaning spray guns (30), draw
Conduit (29) and heat exchanger tube (8) are coaxially connected.
8. the modularization heat-exchange method and device of a kind of particularly suitable biomass combustion system according to claim 2,
It is characterized in that, antifreezing agent can also be added when using water as heat medium.
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