CN106225014A - There is the round bottom of flue gas recirculation, flat vessel heater - Google Patents

There is the round bottom of flue gas recirculation, flat vessel heater Download PDF

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Publication number
CN106225014A
CN106225014A CN201610710040.4A CN201610710040A CN106225014A CN 106225014 A CN106225014 A CN 106225014A CN 201610710040 A CN201610710040 A CN 201610710040A CN 106225014 A CN106225014 A CN 106225014A
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CN
China
Prior art keywords
burner
burner hearth
flue gas
pan
round
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CN201610710040.4A
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Chinese (zh)
Inventor
黄海涛
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广东工业大学
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Priority to CN201610710040.4A priority Critical patent/CN106225014A/en
Publication of CN106225014A publication Critical patent/CN106225014A/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24BDOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00Stoves or ranges
    • F24B1/18Stoves with open fires, e.g. fireplaces
    • F24B1/185Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/189Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by air-handling means, i.e. of combustion-air, heated-air, or flue-gases, e.g. draught control dampers 
    • F24B1/1895Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by air-handling means, i.e. of combustion-air, heated-air, or flue-gases, e.g. draught control dampers  flue-gas control dampers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24BDOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00Stoves or ranges
    • F24B1/18Stoves with open fires, e.g. fireplaces
    • F24B1/191Component parts; Accessories
    • F24B1/197Hearths
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00Details
    • F24C15/001Details arrangements for discharging combustion gases
    • F24C15/002Details arrangements for discharging combustion gases for stoves of the closed type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00Stoves or ranges for gaseous fuels
    • F24C3/08Arrangement or mounting of burners
    • F24C3/082Arrangement or mounting of burners on stoves

Abstract

The invention discloses the round bottom with flue gas recirculation, flat vessel heater, including burner hearth and burner, described heater is arranged as the burning fume of described burner generation and can circulate inside described burner hearth, the ratio of the bottom of a pan volume of the standard circular bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore is more than 2.5, or, the ratio of the bottom of a pan volume of the standard flat bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore is more than 2, the ratio of the bottom of a pan volume of the standard circular bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore is preferably greater than 4.5, or, the ratio of the bottom of a pan volume of the standard flat bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore is preferably greater than 4;The present invention can significantly extend gas residence time and can strengthen for round bottom or the heats of flat vessel thus obtain high thermal efficiency, simple in construction, maintenance with low cost, easy and the Novel cooking stove heater of length in service life.

Description

There is the round bottom of flue gas recirculation, flat vessel heater
Technical field
The present invention relates to cooking stove technical field, a kind of have the round bottom of flue gas recirculation, the heating of flat vessel Device.
Background technology
Commercial kitchen range mainly has Chinese dish cooking oven, large stove, soup stove etc..All the time, commercial kitchen range only has the lowest heat Efficiency." Chinese Cooking Gas Appliance " GB7824-1987 and CJ/T28-1999 to the requirement of the thermal efficiency for being not less than 20%." Chinese meal Gas cooking stove " CJ/T 28-2003 eliminates performance requirement and the test method of the thermal efficiency.In January, 2015 plays the " business of execution By gas kitchen ranges energy efficiency market and efficiency grade " the Chinese Cooking Gas Appliance energy efficiency market that specifies of GB30531-2014 is 25%.
The analysis of causes that the commercial kitchen range thermal efficiency is low is as follows: Fig. 1 and Fig. 2 be respectively prior art chimney meatus transmitting smoke formula and Connect the structural representation of smoke exhausting type kitchen range.Seeing Fig. 1, the bottom of funnel-form burner hearth 1 and top are separately installed with burner 2 and circle End pot 3, flue gas is passed through smoke exhaust barrel 5 by the exhaust opening 4 that burner hearth 1 wall is offered.The flue gas that burner 2 produces is in burner hearth 1 The time of staying is the shortest, and (such as, the burner rated heat input, rated heat load of certain model Chinese dish cooking oven is 42kW, burner hearth bore 400mm, burner hearth Degree of depth 270mm, flue gas is only 0.17s in the time of staying within burner hearth).And owing to smoke exhaust barrel 5 has air inducing effect, flame Easily it is partial to exhaust opening 4 side with flue gas, causes many flue gases to be not in contact with the bottom of a pan the most short circuit and flow into exhaust opening 4.Cigarette Gas discharge has carried away the major part of the total thermal discharge of fuel combustion.It addition, also there is radiation loss the furnace wall of burner hearth 1.Therefore, fuel Burning and only have about 20% in total thermal discharge and can pass to circular bottom pot 3, remaining is 80% with heat loss due to exhaust gas, furnace wall radiation loss etc. Form distributes to surrounding and is wasted.In indirect smoke exhausting type kitchen range shown in Fig. 2, circular bottom pot 3 is supported by pan bracket 6, Flue gas annular spaces between circular bottom pot 3 and burner hearth 1 top is discharged in kitchen in air, is discharged by range hood the most again To outdoor.Flue gas is the shortest in the time of staying of burner hearth 1, and combustion product gases flows through inner space, kitchen and is unfavorable for improving kitchen Room working condition.
It should be noted that the thermal efficiency data of existing commercial kitchen range are according to the measurement of test method of regulation at laboratory Obtain, but laboratory test has bigger difference, such as with actual service conditions: (1) pan temperature is different: laboratory test is Boiling water, temperature is less than 100 DEG C;When being actually used in cooking, in circular bottom pot, there is edible oil (its boiling point is higher than 260 DEG C), cooking Temperature is far above the temperature boiled water.The high then flue gas of pan temperature is little with the heat transfer temperature difference of pan, and the thermal efficiency reduces.(2) flue gas Amount difference: Chinese way of cooking custom uses vigorous fire quick-fried, and exhaust gas volumn is the biggest.The exhaust gas volumn big then time of staying is short, and the thermal efficiency reduces. (3) flame situation is different: often occurring yellow flame time actually used, imperfect combustion is the most serious.(4) during cooking, circular bottom pot is frequent Not adding a cover, ambient cold air can cause extra convection heat losses in entering pot.(5) Chinese way of cooking cook is accustomed to throwing Fry, sometimes cause stove fire sky to burn, extra heat loss can be caused again.In view of factors above, the Chinese dish cooking oven of prior art The thermal efficiency under active usage conditions is generally below 20%.
Chimney meatus transmitting smoke formula shown in Fig. 1 and Fig. 2 and indirect smoke exhausting type cooking stove, large stove, soup stove are in the past and the most all Be widely used in various hotel, hotel, restaurant, restaurant, fast food restaurant, collectiveity canteen (include factory, enterprise, office, cause list Various unit dining rooms such as position, school, army, social framework, group) kitchen.According to the statistical data of catering industry, China Chinese dish cooking oven, large stove, soup stove sum more than 100,000,000.Generally, it is considered that culinary art flue gas be rank vehicle exhaust, The third-largest air pollution source after industrial waste gas.Culinary art flue gas contain black carbon granule (PM2.5), nitrogen oxides, carbon monoxide, Volatile organic matter, GHG carbon dioxide.It addition, the round bottom similar with Fig. 1 and Fig. 2 or the range burner of flat vessel Device is also widely used for the industry that food industry, light industry, Chinese medicine, agricultural byproducts processing etc. are many.These huge number, point The range burner device that cloth is wide, the thermal efficiency is low had both wasted the energy, polluted again environment.Therefore, Development of Novel, efficient cooking stove add Thermal for China such a populous, lack energy resources, face again the country of huge environmental protection pressure simultaneously for There is important practical significance.
Summary of the invention
It is an object of the invention to the problems such as short for existing range burner device gas residence time, the thermal efficiency is low, it is provided that A kind of can significantly extend gas residence time and can strengthen for round bottom or the heats of flat vessel thus obtain High thermal efficiency, simple in construction, maintenance with low cost, easy and the Novel cooking stove heater of length in service life.
The technical scheme is that
Having the round bottom of flue gas recirculation, flat vessel heater, including burner hearth and burner, described heater is arranged The burning fume produced for described burner can circulate inside described burner hearth.
Further, the bottom of a pan volume of the standard circular bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore it Ratio more than 2.5, or, the ratio of the bottom of a pan volume of the standard flat bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore More than 2.
Preferably, the ratio of the bottom of a pan volume of the standard circular bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore Preferably greater than 4.5, or, the bottom of a pan volume of the standard flat bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore Ratio be preferably greater than 4.
Further, described burner hearth be drum type, waist drum shape, calabash shaped, cylindrical shape, horn-like, fall funnel-form, cuboid, Square or polyhedron-shaped.
Further, described burner is air blast burner, and described burner is arranged on described burner hearth bottom center Position, the furnace wall of the bottom of described burner hearth is further opened with exhaust opening, or, described burner is arranged on the furnace wall of burner hearth, Be further opened with exhaust opening on the furnace wall of described burner hearth, described exhaust opening be positioned at on the furnace wall of described burner homonymy.
Or, described burner is atmospheric burner, and described burner is arranged on described burner hearth bottom center, institute State and on the burner hearth bottom wall around burner, offer several auxiliary air air inlets, the furnace wall of described burner hearth is also offered There is exhaust opening.
Or, described burner is made up of the grate using solid fuel, and described grate is arranged in described burner hearth bottom Heart position, the furnace wall of described burner hearth is provided with fire door, the furnace wall of described burner hearth is further opened with exhaust opening.
Preferably, described air blast burner is blast type fuel gas burner, and described blast type fuel gas burner is specified The burning fume produced under thermic load operating mode is more than 1s in the time of staying within described burner hearth.
Preferably, described heater also includes smoke exhaust barrel, and the exhaust opening of described burner hearth connects described smoke exhaust barrel;Described Heater also includes control valve, and described control valve is arranged on the flue between described exhaust opening and described smoke exhaust barrel Or it is arranged in described smoke exhaust barrel.
Alternatively, described heater also includes that ring-shaped flue, described ring-shaped flue ring are had mercy on described burner hearth, described burner hearth edge Offering several exhaust openings, several exhaust openings described connect described ring-shaped flue even circumferential, and described ring-shaped flue connects Described smoke exhaust barrel.
The New Heating of the present invention is arranged as the burning fume of burner generation and can circulate inside burner hearth Flowing, thus burning fume can be extended in the time of staying within burner hearth, and these combustions circulated can be utilized The convection heat transfer' heat-transfer by convection of flue gas and radiant heat transfer effect are strengthened for round bottom or the heats of flat vessel.Due to the present invention's In range burner device, burning fume has the longer time of staying more fully by burning fume heat the most inside burner hearth Passing to round bottom or flat vessel, therefore, the range burner device of the present invention has preferably heating compared with prior art Effect and the higher thermal efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the chimney meatus transmitting smoke formula kitchen range of prior art.
Fig. 2 is the structural representation of the indirect smoke exhausting type kitchen range of prior art.
Fig. 3 is the structural representation of a kind of range burner device for air blast burner of the embodiment of the present invention 1.
Fig. 4 is the structural representation of a kind of range burner device for atmospheric burner of the embodiment of the present invention 2.
Fig. 5 is the structural representation of a kind of range burner device using solid fuel of the embodiment of the present invention 3.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated.Wherein, being merely cited for property of accompanying drawing illustrates, Represent is only schematic diagram, rather than pictorial diagram, it is impossible to it is interpreted as the restriction to this patent;In order to the reality of the present invention is better described Executing example, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;To those skilled in the art For, in accompanying drawing, some known features and explanation thereof may be omitted and be will be understood by.
The exemplary number that the data enumerated in the present invention are only used to that embodiments of the invention are better described and are given According to, except as otherwise noted, do not constitute any restriction to the claims in the present invention.
Embodiment 1
As it is shown on figure 3, be the structural representation of a kind of range burner device for air blast burner in the present invention.Ginseng Seeing that Fig. 3, the bottom of drum type burner hearth 1 and top are separately installed with burner 2 and circular bottom pot 3, burner hearth 1 bottom side is offered on furnace wall There is exhaust opening 4, in order to flue gas to be passed through smoke exhaust barrel 5.Control valve 7 it is additionally provided with on flue between exhaust opening 4 and smoke exhaust barrel 5. In described device, burner rated heat input, rated heat load is 20kW, and burner hearth bore 400mm, furnace depth 270mm, 1/2nd burner hearths are deep The furnace diameter of degree is 600mm.The axis of burner hearth 1, burner 2 and circular bottom pot 3 is to overlap (hereinafter referred to as axis).
During the operation of this device, burner 2 produces flame and high-temperature flue gas jet, the flame of air blast burner and high temperature cigarette Gas jet has bigger kinetic energy (speed that flame sprays is typically up to more than 10m/s) from burner fire hole.Mainly at flame and Under the driving of high-temperature flue gas energy of the impinging jet, the burning fume that burner 2 flame produces flows up, then along circular bottom pot 3 Bottom up outer direction flowing.These the nearly burner hearth of burning smoke air-flow 1 wall time flow still further below, then part the most burning fume flow into Exhaust opening 4, outwards discharges through smoke exhaust barrel 5.Meanwhile, when control valve 7 can provide suitable local flow resistance, part is Burning fume flows into flame root negative pressuren zone, and mixes mutually with flame jet and flow up, and has been introduced into flame root negative pressuren zone Burning fume also can flow up under the influence of flame jet momentum transmits.It is internal that above procedure defines the burner hearth 1 shown in Fig. 3 The circulating of burning fume.The VELOCITY DISTRIBUTION that described burning fume circulates is that the axial symmetry centered by axis is divided Cloth.Above-mentioned what is called " flame root negative pressuren zone " refers to that flame at full speed can drive gas around when burner 2 fire hole sprays Body flows up so that flame root ambient gas density thins out, thus the flame root negative pressuren zone formed.This negative pressuren zone The burning fume that can attract surrounding enters flame jet.From described above, the burning fume shown in Fig. 3 circulates shape The driving force become is the kinetic energy that flame jet itself is had.
In the present embodiment, burner hearth 1 is internal can strengthen adding for circular bottom pot 3 significantly containing a large amount of high temperature burning fume Thermal effect, this is because:
(1) burning fume contacts generation heat convection with the bottom of a pan, transfers heat to the bottom of a pan.
(2) the more important thing is, the infrared energy that the burning fume within burner hearth 1 sends can transfer heat to pot The end.According to gas radiation heat transfer theory, gas radiation intensity and smoke components, flue-gas temperature, flue gas volume and density etc. because of Element is relevant.
(a) smoke components: carbon dioxide and steam that flue gas contains have stronger emitting infrared radiation ability.Many The protium content of the fuel of kind is higher so that combustion product gases typically contains the steam of higher concentration.Such as, natural gas combustion Steam and the gas concentration lwevel exemplary value of burning flue gas are respectively 19% and 9.5% wet flue gas volume.It is to say, it is natural Gas flue gas there is the gas componant close to 1/3rd can produce infra-red radiation.It addition, the black carbon granule that yellow flame generates also has , therefore there is Huang Yanshi, gas radiation intensity when flame in the strongest radianting capacity (including visible light part and infrared part) Significantly increase.
(b) flue-gas temperature: the infra-red radiation that burning fume temperature has sent when being higher than 1200 DEG C is the strongest;When 900 DEG C, it is red External radiation is the strongest;During less than 600 DEG C, its infra-red radiation is the faintest.
(c) flue gas volume and density: the characteristic of gas radiation be exactly in whole gas volume all emissive gas divide Son is simultaneously emitted by radiation, gas volume interface receive be whole gas volume in all emissive gas molecules simultaneously The superposition summation of the infra-red radiation sent.Therefore, gas volume and density are the biggest, the infra-red radiation that its volume interface receives Intensity is the highest.For reflecting that a parameter of gas volume radianting capacity is ray average stroke in gas radiation thermal conduction study.Penetrate Line average stroke the biggest expression radianting capacity is the biggest.Gas radiation is volume radiation.In figure 3, the bottom of a pan of circular bottom pot 3 can connect Receive the infrared energy at the burning fume of burner hearth 1 inner loop flowing and (include the part directly received and by burner hearth 1 Wall reflexes to the part in the bottom of a pan).The smoke density that burner hearth 1 internal volume is the biggest or it is contained is the highest, then the bottom of a pan receives The infrared energy arrived is the biggest.
See Fig. 3, when substantial amounts of burning fume flows in burner hearth 1 inner loop, as long as burning fume temperature is substantially tieed up Holding more than 800 DEG C, burning fume has contained the most carbon dioxide and the infrared energy that steam sends can be by burning fumes Heat passes to the bottom of a pan of top.If burning fume contains the black carbon granule that yellow flame generates, the then burning fume circulated In black carbon granule radiation can also transfer heat to top the bottom of a pan.These are in the combustion of burner hearth 1 inner loop flowing Flue gas is equivalent to serve the effect of an infrared heater.As long as the flame jet energy that burner 2 produces enough maintains stove Thorax 1 internal temperature is more than 800 DEG C, and burning fume can be driven to occur the most significantly to circulate, and makes on burner hearth 1 inside Under Temperature Distribution everywhere more uniform, then the range burner device shown in Fig. 3 can utilize the institute of burning fume circulated The convection heat transfer' heat-transfer by convection and the radiant heat transfer effect that have strengthen the heats for circular bottom pot 3.
In order to be illustrated more clearly that beneficial effects of the present invention, below by prior art Fig. 1 and Fig. 2 and the present embodiment Fig. 3 Comparing analysis: in fig. 1 and 2, the flue gas that burner 2 produces the most upwards is discharged, and this is high The characteristic of temperature flue gas, therefore, the burning fume that burner 2 flame produces simply the most disposably, in a flash in the pot of circular bottom pot 3 The of short duration contact in the end (it practice, in the case of in burner 2 leaves, big fire gear produces bigger exhaust gas volumn, many in Fig. 1 and Fig. 2 Flue gas is not in contact with the bottom of a pan and the most upwards discharges).Owing to the bottom of a pan heat exchange area is little, flow of flue gas speed fast, major part flue gas Heat has little time to pass to the bottom of a pan, and these heats just arrive atmospheric environment with fume emission.Therefore prior art Fig. 1 and Fig. 2 The thermal efficiency of chimney meatus transmitting smoke formula and indirect smoke exhausting type kitchen range only has about 20%.
Comparing, the present embodiment Fig. 3 is artificially, on purpose by range burner device to be arranged as burner 2 flame to produce Raw burning fume can not the most upwards drift about and leave burner hearth 1, but can order about burning fume by flame kinetic energy and exist Internal the circulating of burner hearth 1 (needs some given shape and the local flow resistance of control valve 7 generation of burner hearth 1 Match) so that burning fume contacts in multiple times, for a long time with the bottom of a pan and carries out convection heat transfer' heat-transfer by convection.The more important thing is, this reality Executing example can also utilize the infrared energy circulating flue gas in a large number within burner hearth 1 to come at the bottom of heating kettle.Due to the present embodiment Burning fume has the longer time of staying more fully more burning fume heat to be passed to the bottom of a pan inside burner hearth 1, because of This, the range burner device of the present embodiment has more preferable heats and the higher thermal efficiency compared with prior art.
For example, the burner rated heat input, rated heat load of certain model chimney meatus transmitting smoke formula air blast cooking stove of prior art is 42kW;Funnel-form burner hearth bore 400mm, degree of depth 270mm, burner hearth bottom diameter 120mm;The geometric volume of burner hearth is 0.0157m3, volume that the bottom of a pan (degree of depth 110mm) of the standard circular bottom pot adaptive with this burner hearth bore occupies (i.e. being less than of pan The part volume of burner hearth 1 top pot circle, hereinafter referred to as the bottom of a pan volume) it is 0.0076m3(note: standard circular bottom pot refer to diameter/ Depth ratio is the circular bottom pot of 0.25 to 0.35;Standard flat bottom pot refers to " household gas utensils energy efficiency market and efficiency grade " GB The test pan that 30720-2014, " commercial gas kitchen range energy efficiency market and efficiency grade " GB 30531-2014 specify).Stove Thorax internal capacity deducts the bottom of a pan volume equal to geometric volume: 0.0157 0.0076=0.0081m3, burner hearth internal capacity and the bottom of a pan The ratio of volume is 0.0081/0.0076=1.07;Burner hearth internal area is 0.4229m2, the ray average stroke of gas radiation For: 3.6x burner hearth internal capacity/burner hearth internal area=0.069m;The natural gas air consumption 4.378m of rated heat input, rated heat load3/ h, 900 DEG C of exhaust gas volumns 186.47m3/ h, flue gas in the time of staying within burner hearth is: burner hearth internal capacity/exhaust gas volumn=0.156s; 700 DEG C of exhaust gas volumns 154.67m3/ h, flue gas is 0.19s in the time of staying within burner hearth.Owing to gas residence time only has zero Point, more than one second, may determine that the thermal efficiency of this model air blast cooking stove is relatively low accordingly.
The present embodiment burner rated heat input, rated heat load is 20kW, and drum type burner hearth bore 400mm, furnace depth 270mm, at the bottom of burner hearth Portion diameter 400mm;The geometric volume of burner hearth is 0.044m3, the bottom of a pan (degree of depth of the standard circular bottom pot adaptive with this burner hearth bore Volume 110mm) occupied is 0.0076m3, the internal capacity of burner hearth is 0.0364 m3, burner hearth internal capacity and the bottom of a pan volume it Ratio is 4.8.Visible, the drum type burner hearth internal capacity that the present embodiment uses in the case of identical burner hearth bore is compared with certain type above-mentioned The funnel-form burner hearth internal capacity of number air blast cooking stove increases 0.0364/0.0081=4.5 times.
The present embodiment burner hearth internal area is 0.73m2, the ray average stroke of gas radiation is: 3.6x burner hearth is internal to be held Long-pending/burner hearth internal area=0.1795m.The ray average stroke of the drum type burner hearth gas radiation that the present embodiment uses is compared with above-mentioned The ray average stroke of the funnel-form burner hearth gas radiation of certain model air blast cooking stove increases 0.1795/0.069=2.6 times.
The natural gas air consumption of the present embodiment rated heat input, rated heat load is 2.085m3/ h, 900 DEG C of exhaust gas volumns 88.794m3/ h, flue gas In the time of staying within burner hearth it is: burner hearth internal capacity/exhaust gas volumn=1.48s.The gas residence time of the present embodiment compared with The gas residence time of certain model air blast cooking stove above-mentioned increases 1.48/0.156=9.5 times.
The bottom of a pan area of the present embodiment circular bottom pot is 0.1636m2, the flue-gas temperature contacted with the bottom of a pan is about 1000 DEG C, pot End temperature is about 300 DEG C, and heat transfer temperature difference is 700 DEG C, and convection transfer rate is about 25W/m2DEG C (in Fig. 3 burning fume circulation Flowing is driven by flame kinetic energy, and flow velocity is little, convection transfer rate 25W/m2DEG C it is rational), then convection heat transfer' heat-transfer by convection Amount=convection transfer rate x the bottom of a pan area x heat transfer temperature difference=2.863kW.
Inside the present embodiment drum type burner hearth, burning fume average absolute temperature is 1173K, the ray average row of gas radiation Obtaining natural gas flue gas blackness according to Hottel Heisler chart during journey 0.1795m is 0.18.Owing to blowing-type cooking stove has slight It is relatively reasonable that Huang Yan, burning fume blackness estimate to reach 0.3.Radiation according to the fourth-power law of radiant intensity, burning fume passes The biquadratic of heat=Stefan-Boltzmann constant x the bottom of a pan area x burning fume average absolute temperature of burning fume blackness x =5.273kW.
To the heating power in the bottom of a pan it is: convection heat transfer' heat-transfer by convection amount+radiant heat transfer amount=2.863+5.273=8.136kW, the thermal efficiency =heating power/burner rated heat input, rated heat load=40.7%.Visible, utilize convection heat transfer' heat-transfer by convection and the spoke of the burning fume circulated Penetrate heat transfer effect and can strengthen the heats for the bottom of a pan, improve the thermal efficiency.
Above-mentioned radiant heat transfer amount is more than convection heat transfer' heat-transfer by convection amount.The influence factor of convection heat transfer' heat-transfer by convection amount is convection transfer rate, pot Floor space and heat transfer temperature difference.The bottom of a pan area is to be determined by pan size and dimension, and heat transfer temperature difference depends on flue-gas temperature, right The stream coefficient of heat transfer is mainly affected by flue gas flow rate.For range burner device, these three parameter can not have significantly Raising.Radiant heat transfer amount is the most different, and gas radiation is volume radiation.In the case of the bottom of a pan area is constant, as long as increasing pot The flue gas volume of beneath side, emissive gas and the thermal-radiating superposition of solids transmitting in these flue gas volume just can Caloradiance that the bottom of a pan receive is dramatically increased, thus increases burning fume to the heat output in the bottom of a pan.
In conjunction with data above, further illustrate the district of the present invention and the prior art that certain model air blast cooking stove is representative Other: certain model air blast cooking stove rated heat input, rated heat load is 42kW, and flue gas only has more than 0. 1 seconds in the time of staying within burner hearth, its Actual heating power for the bottom of a pan is about 8.4kW (can meet firepower demand 8kW of 400mm circular bottom pot cooking).When this air blast When cooking stove opens moderate heat gear (burner thermic load is reduced to 20kW), flue gas is 0. 3 seconds in the time of staying within burner hearth Many, flue gas is still that disposably, in a flash in of short duration with the bottom of a pan contact, when opening moderate heat, the actual heating power in the bottom of a pan will reduction To about 4.5kW, do not reach the firepower demand of 400mm circular bottom pot cooking.
The present embodiment burner rated heat input, rated heat load is 20kW, and after using drum type burner hearth, a large amount of burning fumes follow below the bottom of a pan Circulation moves, and with the bottom of a pan in multiple times, contact for a long time, flue gas reaches 1.48 seconds in the time of staying within burner hearth.By following The convection heat transfer' heat-transfer by convection of the burning fume that circulation is dynamic and radiant heat transfer effect, heating power to the bottom of a pan under burner rated heat input, rated heat load Reach 8.136kW, the firepower demand of 400mm circular bottom pot cooking can be met.The present embodiment is at burner rated heat input, rated heat load 20kW In the case of obtain the heating power 8.136kW for the bottom of a pan, therefore the thermal efficiency reaches 40.7%, than prior art promote one times.
Time actually used in addition to cooking, circular bottom pot is also frequently used for boiling, steams, explodes, boiled dinner thing.At this moment the present embodiment combustion Burner can reduce firepower to thermic load 10kW, and when thermic load reduces, the reduction of exhaust gas volumn makes flue gas when the stop within burner hearth 1 Between double many, reach 3s.The flue-gas temperature contacted with the bottom of a pan is the highest, but flue gas flow rate reduces, convection transfer rate It is about 15W/m2DEG C, convection heat transfer' heat-transfer by convection amount about 1.72kW.Inside burner hearth, burning fume average absolute temperature is reduced to 1073K, spoke Penetrate heat output about 3.69kW.The heating power in the bottom of a pan is about 5.41kW, and the thermal efficiency reaches 54.1%.Visible, when burner heat is born When lotus reduces, the burning fume time of staying increases, and the thermal efficiency increases.
Formation that in range burner device shown in the present embodiment Fig. 3, burning fume has circulated and energy-conserving action thereof and burner hearth Shape, volume and internals, the type of burner 2 and the performance (especially exhaust gas volumn and flue gas kinetic energy) of 1, exhaust opening 4 The factors such as the local flow resistance that position produces with area, the air inducing power of smoke exhaust barrel 5 and control valve 7 are relevant, furtherly Bright as follows:
(1) shape of burner hearth 1, volume and internals:
(a) shape: using drum type burner hearth is optimum selection, not only improves circulating of burning fume, it is also possible to increase Burner hearth internal capacity, and beneficially flame and flue gas heat radiation are reflexed to the bottom of a pan by furnace wall, and hold inside identical burner hearth Time long-pending, drum type burner hearth outer surface area of dissipation is minimum, and it is minimum that required furnace wall makes material.Other burner hearth shape such as waist drum shape, Calabash shaped, cylindrical shape, horn-like, fall funnel-form, cuboid, square, polyhedron etc. and be also beneficial to burning fume and circulate Formation.But prior art commonly used funnel-form burner hearth (Fig. 1 and Fig. 2) be then unfavorable for being formed the recycle stream of burning fume Dynamic.
(b) volume: burner hearth 1 internal capacity is the biggest, then the exhaust gas volumn circulated below the bottom of a pan that can accommodate is the biggest, The best to the heats in the bottom of a pan.Therefore, the present invention should use bigger burner hearth internal capacity, described burner hearth internal capacity and institute The ratio of the bottom of a pan volume stating the suitable standard circular bottom pot of burner hearth bore should be greater than 2.5, or, described burner hearth internal capacity and institute The ratio of the bottom of a pan volume stating the suitable standard flat bottom pot of burner hearth bore should be greater than 2.Further, described burner hearth internal capacity with The ratio of the bottom of a pan volume of the standard circular bottom pot that described burner hearth bore is suitable is preferably greater than 4.5, or, described burner hearth is internal to be held The ratio of the bottom of a pan volume of the long-pending standard flat bottom pot suitable with described burner hearth bore is preferably greater than 4.If burner hearth internal capacity When only having about 1 with the ratio of the bottom of a pan volume, the exhaust gas volumn below the bottom of a pan very little, even if there is the circulation of burning fume inside burner hearth Flowing, the effect improving the thermal efficiency is the most inconspicuous.
(c) internals: component such as kuppe, circular dividing plate, baffle plate, crimping or flue gas are set inside burner hearth 1 Drainage device and place venturi induction tunnel above burner 2 and can strengthen burning fume and circulate.But commercial kitchen range heat is born Lotus is big, and fire box temperature is high, arranges component and will greatly increase cost, and the easy cause thermal damage excessively of burner hearth internals inside burner hearth, Difficult in maintenance.Therefore the present embodiment is not provided with burner hearth internals.
(2) type of burner 2 and performance (especially exhaust gas volumn and flue gas kinetic energy):
Range burner device shown in the present embodiment Fig. 3 use fuel can be combustion gas (as natural gas, liquefied petroleum gas, Coal gas etc.), fuel oil (such as diesel oil, heavy oil, alcohol-based fuel etc.) or other (such as coal dust, water-coal-slurry etc.).The cigarette that burner 2 produces Pneumatic energy is the biggest, and burning fume the most circulates the strongest.The present embodiment preferably selects those flame jet velocities height, flue gas kinetic energy Big burner.The degree of depth of the present embodiment drum type burner hearth 1 should be suitable with the length of flame of burner 2.Such as, air blast is used During formula oil burner, owing to fuel oil needs atomization, its flame jet has greater depth, then the degree of depth of burner hearth 1 should increase accordingly, Burner hearth 1 internal capacity can be increased, be conducive to strengthening the heats to the bottom of a pan.The burner of some type is except shown in Fig. 3 Outside air supply, in addition it is also necessary to supplement auxiliary air.At this moment air injection reaction mouth can be arranged in burner hearth 1 combustion bottom burner 2 Around, circulating of burning fume can be strengthened.
Time actually used, exhaust gas volumn and flue gas kinetic energy change with the firepower gear of burner 2, opium during cooking operation The ratio of tolerance and minimum exhaust gas volumn is up to 20 to 30.In burner 2 leaves during big fire gear, the present embodiment can obtain in burner hearth 1 The strongest burning fume in portion circulates.If burner 2 firepower the least (such as insulation fire), then driven by flue gas kinetic energy Burning fume circulate the most notable.In the case of burner 2 firepower is the least, in the present embodiment can utilize burner hearth 1 It (is exactly fresh high-temperature flue gas and the burner hearth 1 that burner 2 flame produces that the temperature difference in portion produces circulating of burning fume The temperature difference of the internal old flue gas existed).Specifically, the smoke distribution within the present embodiment drum type burner hearth 1 is total Be the flue gas that temperature is the highest be positioned at the highest with the position of the bottom of a pan close contact and the minimum flue gas of temperature is positioned at minimum close The position of exhaust opening 4, therefore, the fresh high-temperature flue gas that burner 2 produces is abundant with the bottom of a pan after will flow up the arrival the bottom of a pan Ground, contact for a long time, until its major part heat pass to the bottom of a pan and reduce temperature after the most gradually downward flowing arrive smoke evacuation Discharging after mouth 4, the position under the bottom of a pan can be burned again occupied by the fresher high-temperature flue gas that device 2 produces simultaneously.Visible, in combustion In the case of burner 2 firepower the least (insulation fire), in the present embodiment burner hearth 1, high-temperature flue gas has the longest heat-exchange time to be filled by heat Pass to the bottom of a pan with dividing, therefore can obtain the highest thermal efficiency.
But, in the indirect smoke exhausting type kitchen range of prior art Fig. 2 commonly used at present, no matter exhaust gas volumn size, flue gas Will the annular spaces between circular bottom pot 3 and burner hearth 1 top the most upwards waft, gas residence time is extremely short.Existing In the chimney flue type kitchen range of technology Fig. 1 burner 2 firepower reduce time gas residence time have to a certain degree increase but also difference little. Only in the range burner device of this arrangement of the present embodiment Fig. 3, the heat smoke that burner 2 produces can not at once to Upper drift is walked, and the flue gas at the higher temperature within burner hearth 1 can flow up, and the flue gas of lower temperature then flows downward, so The high-temperature flue gas that burner 2 produces tends to stay under the bottom of a pan, carries out Long contact time with the bottom of a pan, and is passed fully by heat Pass the bottom of a pan, and the flue gas after those reduce temperature just trends towards discharging from exhaust opening 4.
In the case of burner 2 firepower is the least, burner hearth 1 temperature of lower can be less than flue gas dew point temperature, and flue gas institute is aqueous Steam will be condensed into condensed water so that the water vapor condensation latent heat of burning fume also can be utilized effectively.As can be seen here, this reality Execute example and can also utilize the fuel higher calorific value including flue gas water vapor condensation latent heat, the low level of natural gas and higher calorific value It is respectively 34.5 and 38.3MJ/m3, the thermal efficiency utilizing flue gas water vapor condensation latent heat can obtain about 11% extraly promotes Amplitude.Based on above reason, the present invention open when be used for the long period little fire cooking operation (such as boil, steam, explode, stew, stew, endure, Braised, stewing etc.) more high thermal efficiency can be obtained.
(3) position of exhaust opening 4 and area:
In the present embodiment, exhaust opening 4 is arranged on bottom burner hearth 1 and is conducive to the formation that burning fume circulates.If smoke evacuation Mouthfuls 4 are arranged on burner hearth 1 top, then need exhaust opening 4 and control valve 7 to have the sufficiently large local flow resistance could be at burner hearth 1 It is internally formed circulating of burning fume.The area of exhaust opening 4 should be by maximum exhaust smoke level design.
(4) the air inducing power of smoke exhaust barrel 5:
When using air blast burner, even if the air inducing power of smoke exhaust barrel 5 is less, being typically also can smooth and easy smoke evacuation. Less air inducing power is also beneficial to the internal formation that burning fume circulates of the present embodiment burner hearth 1.If the air inducing of smoke exhaust barrel 5 Power is excessive, then in burner hearth 1 burning fume can be short-circuited inflow exhaust opening 4, be unfavorable for forming the strong recycle stream of burning fume Dynamic.
(5) the local flow resistance that control valve 7 produces:
The Main Function of control valve 7 is to produce suitable local flow resistance.The aperture of control valve 7 will be with burner 2 firepower sizes adjust to reach the exhaust smoke level of requirement.On the premise of reaching the exhaust smoke level of requirement, the aperture of control valve 7 Produce the biggest local flow resistance, be just conducive to occurring circulating of burning fume inside burner hearth 1.Such as, row The air inducing power of chimney 5 is 15Pa, and the aperture of control valve 7 about 70% produces the local flow resistance of 10Pa, exhaust opening 4 import Local flow resistance is 3Pa, and smoke evacuation is 1Pa along journey frictional resistance, and burner hearth 1 is internal is tiny structure 1Pa.Under the conditions of above-mentioned, if Lacked the 10Pa local flow resistance that control valve 7 aperture about 70% produces, then burner hearth 1 is internal will reach negative pressure 11Pa, at this moment It is difficult to be formed circulating of burning fume and extends burning fume significantly in the time of staying within burner hearth 1.Need explanation , it is not provided with control valve 7 and uses other technological means can obtain suitable local flow resistance too, or Saying, control valve 7 can be substituted (such as, selecting suitable exhaust opening 4 or flue circulation area) by other technological means.
The present embodiment is in order to obtain the internal effect that burning fume circulates of preferable burner hearth 1, and control valve 7 should be with The size of exhaust gas volumn carries out suitable adjustment.In order to simplify practical operation, preferably by firepower governor motion and the tune of burner 2 Joint valve 7 is designed as (as the fire adjustment knob of burner 2 and the spin axis of control valve 7 pass through machine driving) of linkage, The aperture of control valve 7 can be the most automatically changed when adjusting the firepower gear of burner 2 according to culinary art demand.
The enforcement of the present invention is preferably capable of fully understanding the know-why of the present invention, it is considered to regard to listed above five Aspect content is comprehensively arranged, and suitably regulates operating condition, is more beneficial for obtaining the effect preferably improving the thermal efficiency.Only Only burner hearth is made as drum type and exhaust opening is set at burner hearth bottom it cannot be guaranteed that there is burning fume the most inside burner hearth Circulate.The current designs code requirement chimney air inducing power of big-and-middle-sized food and beverage enterprise kitchen exhaust facility reaches more than 10Pa. When the chimney of chimney flue type kitchen range with 10Pa air inducing power is directly connected to, but when lacking the measure of regulation air inducing power, regardless of shape The burner hearth of shape, the burning fume within burner hearth all can be taken away by chimney air inducing power, it is difficult to is internally formed at burner hearth and significantly fires Flue gas recirculation is flowed.
The present embodiment also has the beneficial effect of other side.Such as, burning fume circulates and can be contained by burning fume Some imperfect combustion products or combustible return flame combustion district after-flame, and therefore contaminant reducing is formed and discharge.Fire Residue oxygen contained by burning fume can also be recycled into high temperature combustion zone and participate in oxidation reaction by flue gas recirculation flowing again, from And enable oxidant to be fully utilized, the air capacity of supplied burner 2 can be reduced, reduce unnecessary oxygen and nitrogen in smoke evacuation The heat that gas carries away.Burning fume circulates and can also reduce nucleus of flame district temperature, reduces the formation of nitrogen oxides.Separately Outward, the furnace wall of the present embodiment burner hearth 1 is arranged remotely from the flame of burner 2, it is possible to decrease the heat resistance requirement of furnace wall materials, subtracts The making of few cooking stove and maintenance cost, extend cooking stove service life.The present embodiment also has good heat insulation effect: see Fig. 3, As long as culinary art closes control valve 7 after terminating to close burner 2, it is internal that heat smoke just can all rest on burner hearth 1, these cigarettes Gas waste heat can continue heating and insulation pan long period.Comparing, the culinary art of prior art Fig. 2 terminates rear heat smoke the most upwards Flow away, not there is heat insulation effect;After Fig. 1 culinary art terminates, major part heat smoke is discharged through flue, does not the most have heat insulation effect.
The burner hearth 1 of range burner device shown in Fig. 3 preferably uses cast steel or cast iron materials to be cast as, it is also possible to fire-resistant Material makes.Burner hearth 1 outside wall surface has heat-insulation layer (Fig. 3 is not shown).
In the present embodiment, burner 2 can also use other type of need not to utilize gravity-flow ventilation to supplement auxiliary air Burner or heater (such as infrared gas combustion heater), burner 2 can also replace with heater (such as electric heater Deng).The fuel type that burner 2 is used can be combustion gas, fuel oil or other.
Although the present embodiment illustrates as a example by circular bottom pot, the range burner device shown in Fig. 3 also can be used for heating it The vessel of its type.
Embodiment 2
As shown in Figure 4, for the structural representation of a kind of range burner device for atmospheric burner of the present invention.Greatly Gas formula burner is to utilize high-pressure gas to introduce primary air and to rely on gravity-flow ventilation to supplement the burner of auxiliary air.Greatly Gas formula burner is not required to be equipped with aerator, it is to avoid the power consumption of aerator and running noise, is commonly used for the burner of kitchen kitchen range.
Seeing Fig. 4, the bottom of the present embodiment drum type burner hearth 1 and top are separately installed with burner 2 and pan 8, burning Several auxiliary air air inlets are had around device 2.The furnace wall, side of burner hearth 1 is provided with exhaust opening 4, in order to flue gas is passed through smoke evacuation Cylinder 5.Drum type burner hearth 1 sidewall is provided with fire observation window (Fig. 4 is not shown).
Inside burner hearth 1, burner 2 produces flame and high-temperature flue gas jet, atmospheric burner fuel-air mixture It is about 1 to 3m/s from the speed of burner fire hole ejection.Main under the driving of flame and high-temperature flue gas energy of the impinging jet, burning The burning fume that device 2 produces flows up, then along pan 8 bottom outwardly, then flow up along pot sidewall.? In above-mentioned flow process, flue gas heat passes to pot, and flue-gas temperature reduces.The burning fume of these lower temperatures is then along stove Thorax 1 wall flows downward, and part burning fume flows into exhaust opening 4, outwards discharges through smoke exhaust barrel 5.Meanwhile, when control valve 7 energy When enough providing suitable local flow resistance, part burning fume the most flows into flame root negative pressuren zone, and mixes mutually with flame jet Flow up.Above procedure defines circulating of the internal burning fume of burner hearth 1 as shown in Figure 4.
It is the air inducing power utilizing smoke exhaust barrel 5 that atmospheric burner 2 supplements auxiliary air.The aperture changing control valve 7 can To regulate auxiliary air air inflow, method of adjustment is: control valve 7 standard-sized sheet when big fire gear left by burner 2, regulates valve during moderate heat Door 7 opens half;It is finely adjusted on the basis of above-mentioned, it is simply that slowly reduce the aperture of control valve 7, observe burner 2 simultaneously Flame combustion situation.As long as flame combustion is stable, occurring without Huang Yan, auxiliary air import occurs without down cigarette, it is possible to continue Reduce the aperture of control valve 7, to reach optimum auxiliary air air inflow.If burner 2 flame is substantially partial to smoke evacuation Mouth 4 sides, also should suitably reduce control valve 7 aperture.
The bottom of a pan volume of pan (i.e. pan less than the part volume of burner hearth 1 top pot circle) is bigger.The present embodiment Burner hearth 1 internal capacity is about 3 with the ratio of the bottom of a pan volume.
Although the present embodiment illustrates as a example by pan, the range burner device shown in Fig. 4 also can be used for heating it The vessel of its type.
The NM part of the present embodiment is similar to Example 1, and here is omitted.
Embodiment 3
As it is shown in figure 5, the structural representation of a kind of range burner device using solid fuel for the present invention.See figure 5, the bottom of drum type burner hearth 1 is provided with grate 9, the furnace wall, side of burner hearth 1 is provided with exhaust opening 4, relative with exhaust opening 4 Fire door 10 is offered on wing furnace wall.
This device operating process is as follows: open fire door 10, and solid fuel is put into burner hearth 1, is deposited in (this on grate 9 A little solid fuels can be coal or biomass fuel such as firewood, straw, Caulis et Folium Oryzae, wheat straw, debirs, rubbish etc.).With fire Plant and light the solid fuel being deposited on grate 9, close fire door 10.In burner hearth 1, the original air existed is for solid fuel Initiation combustion.Meanwhile, outside air is passed through solid fuel heap (available forced ventilation such as aerator or artificial wind through grate 9 Case blasts outside air, or utilizes gravity-flow ventilation).Flame and high-temperature flue gas that these solid fuel ignitions produce flow up Arriving the flowing of backward outer direction, the bottom of a pan, flow still further below, then part burning fume is discharged through exhaust opening 4 and smoke exhaust barrel 5, portion Divide burning fume to flow up under flame and high-temperature flue gas momentum transmit and drives, form burning fume following within burner hearth 1 Circulation moves.
The heated mechanism in the bottom of a pan includes convection heat transfer' heat-transfer by convection and radiant heat transfer.In the burning fume produced during solid fuel ignition The composition with relatively intense radiant heat ability includes: (1) carbon dioxide;(2) steam (biomass fuel has bigger water capacity, its Combustion product gases typically has the steam of higher concentration, and water vapor concentration is up to 30 to 50% sometimes);(3) the black carbon that Huang Yan generates Granule;(4) solid fuel fragment, powder and the coke fines that the part that flue gas is carried secretly is burnt or burnt;(5) flue gas is carried secretly Solid fuel ash and inorganic particles.Under ignition temperature, above-mentioned five kinds of compositions can launch stronger infrared energy (rear three kinds of compositions also produce visible radiation), wherein the heat radiation with coke fines is the strongest, and black carbon granule takes second place.Solid fuel The blackness of combustion product gases commonly reaches 0.5, and its caloradiance is higher than combustion gas or the fuel oil flame cigarette of above embodiment 1 and 2 The caloradiance of gas.The radiant heat transfer of the burning fume that drum type burner hearth 1 inner loop that utilizes the present embodiment flows can the most significantly Degree ground strengthens the heats for the bottom of a pan, improves the thermal efficiency.
The grate 8 of the present embodiment can use the various grate forms of prior art.Grate 8 has three effects: (1) supporting is solid Fluid fuel heap;(2) combustion air can be in grate be passed through stove;(3) lime-ash can be discharged through grate.Depend on range burner of the present invention The purposes of device, the small-sized or family used time can be selected for simply fixing grate (typically by some diameter about 5mm, length about The iron of 100mm is arranged at uniform intervals.When the solid fuel used is coal, the about 5mm of the interval between iron bar;Combustion When using biomass fuel, the about 10mm of the interval between iron bar).Also can install ash silo, air channel etc. below grate 8, these are known Technology.The present invention is used as during the commercial stove heater of bigger thermic load to may select stoker fired grate as grate 8.
When using natural ventilation system to supply combustion air in stove, change the aperture adjustable warping stove of control valve 7 The combustion air air inflow that grid 9 flow into, method of adjustment is similar to Example 2, and (grate 9 and the solid fuel heap of the present embodiment are suitable In burner 2), control valve 7 standard-sized sheet when the burning of solid fuel heap is vigorous, exhaust gas volumn is big, control valve when exhaust gas volumn is medium Open half;It is finely adjusted on the basis of above-mentioned, it is simply that slowly reduce the aperture of control valve 7, observe flame combustion feelings simultaneously Condition.As long as flame combustion is stable, occurring without large area Huang flame, grate 9 occurs without down cigarette, it is possible to continue to reduce control valve 7 Aperture, to reach optimum air quantity delivered.
The present embodiment is when using forced ventilation by grate 8 to burner hearth 1 internal supply combustion air, preferably by exhaust opening 4 are arranged on bottom burner hearth 1.
Biomass fuel contains higher volatile matter, predominantly gas-phase combustion.The present embodiment when burning-used biologic mass fuel and When using aerator to force to be passed through combustion air, further improving is that combustion air is divided into two-way: wherein a road is for once Air, is passed through through grate 8;Another road is auxiliary air, sprays into burner hearth 1 through the furnace wall of burner hearth 1 internal.Auxiliary air sprays into mode The formation (as being arranged in above exhaust opening 4 by auxiliary air entrance) that shown in Fig. 5, burning fume has circulated should be conducive to.
The NM part of the present embodiment is similar with above example, and here is omitted.
In three above embodiment, exhaust opening 4 is all opened on the furnace wall of burner hearth 1 side, causes burner hearth to a certain extent It is asymmetric or uneven (although the local flow resistance of control valve 7 is permissible that 1 internal burning fume circulation flow rate is distributed Alleviate this asymmetric or uneven).In order to avoid disadvantages mentioned above, it is to arrange ring-shaped flue that the present invention further improves, described Ring-shaped flue ring is had mercy on burner hearth 1, and offers several exhaust openings on the furnace wall of burner hearth 1 the most equably, several rows described Mouth connection ring-shaped flue, described ring-shaped flue connects described smoke exhaust barrel 5.
In three above embodiment, burner 2 is all mounted in burner hearth bottom center, enables heated pan Thermally equivalent, but its shortcoming is when excessive pot occur, taking out food or take off pan from range burner device from pan, Decoction, oil droplet, dish sheet, foreign material etc. easily drop to burner 2 fire hole, affect burner performance, often to clear up and to safeguard.Fire hole Needing when being stained serious to change burner, this is one of short reason in commercial kitchen range burner service life.In order to avoid above-mentioned Shortcoming, it is that burner 2 is arranged on the furnace wall of burner hearth 1 (burner 2 fire hole injection direction is substantially that the present invention further improves For horizontal direction), exhaust opening 4 is opened in on the furnace wall of described burner 2 homonymy, and the lower section being preferably positioned at burner 2 is leaned on The bottom of nearly burner hearth 1, equally forms the strongest burning fume and circulates.
The present invention, without reference to any complex precise, the high-tech equipment parts of somewhat expensive, is also fired without reference to advanced person Burning technology.The present invention is directed to reality, seek solving practical problems, the Novel cooking stove heater simple in construction that proposed, Practical.Essential features of the present invention be range burner device is arranged as substantial amounts of burning fume can be below the bottom of a pan Circulate.Fuel type, burner types and parameter, the shape of plan heating vessel is depended on when the present invention is embodied as The factors such as shape, size and purposes, directly or indirectly smoke evacuation, kitchen condition can have diversified embodiment.This The combustion space of bright Novel cooking stove heater is relatively big, and furnace wall, away from flame, therefore can reduce for furnace wall materials thermostability The requirement of energy.But hearth outer wall area of dissipation increases the most accordingly, the heat-proof quality of heat-insulation layer there is higher requirement.It addition, adjust Joint valve 7 also has certain heat resistance requirement.Control valve 7 may be installed distance exhaust opening 4 farther out, flue-gas temperature relatively low, Valve regulated the most conveniently position (is arranged on flue or smoke exhaust barrel).
On the whole, the present invention have thermal efficiency height, simple in construction, maintenance with low cost, easy, length in service life excellent Point.
In three above embodiment, rely primarily on the observation to flame combustion situation and be adjusted, take than relatively time-consuming Power, the most accurate.It is configuration PLC automaton that the present invention further improves, and is described as follows and (adopts with Fig. 3 shown device As a example by blast type fuel gas burner): at flue, carbon monoxide transducer and oxygen sensor are installed, control valve 7 and row Installing pressure transducer on flue between mouth 4, variable-frequency governor installed by the aerator of burner 2, and control valve 7 uses electricity Control changes the electromagnetic valve of aperture, and (burnt gas valve aperture is needed according to culinary art firepower by user to install burnt gas valve jaw opening sensor It is adjusted).Above sensor connects PLC input, and PLC outfan connects blower variable frequency speed regulator and control valve 7 electromagnetic valves.PLC rate-determining steps is for change rapidly blower speed and control valve 7 aperture according to burnt gas valve aperture signal, so After be finely adjusted on the basis of the above: if carbon monoxide is the most up to standard, increase blower speed;If after carbon monoxide is up to standard Oxygen concentration height then reduces blower speed;The aperture of control valve 7 is according to the cigarette kept between control valve 7 and exhaust opening 4 Road pressure is that the scope of negative pressure 1 to 4Pa is finely adjusted.
It is concrete that above example gives when the present invention is applied to common burner and conventional circular bottom pot, pan Embodiment.These embodiments are intended merely to clearly demonstrate example of the present invention, and are not to embodiment party of the present invention The restriction of formula.The burner used due to people is of a great variety, and pan is also purposes and various informative, has many in different regions The dissimilar kitchen utilities with different scales, installation and the use condition difference of its range burner device are bigger.Here can not The detailed description of the invention of the present invention can be given one by one for every kind of concrete condition, need not at this to be also impossible to the present invention is owned Embodiment give exhaustive.
For those of ordinary skill in the field, can do as the case may be on the basis of above-described embodiment Go out change or the variation of other multi-form.Such as, the building that large-scale catering enterprise is used typically has special height to reach 5 Chimney more than 10 meters.In this case, the exhaust opening 4 of the range burner device of some set present invention can be communicated to same Individual chimney.Contrary situation is, the building that many small-sized food and beverage enterprises (such as fast food restaurant, noodle bar) are used does not has special Chimney.In this case, the Novel cooking stove heater of the present invention can simplify.Such as, Fig. 4 can cancel smoke exhaust barrel 5, change into exhaust opening 4 being opened in burner hearth 1 top (pan 8 side), exhaust opening 4 configuration adjustment valve 7, described range burner The flue gas of device is directly discharged in kitchen in air by exhaust opening 4.The similar change can made as the case may be Or change is apparent from for those of ordinary skill in the field.
All made within the spirit and principles in the present invention any amendment, simplify, substitute, add, combine, modify, etc. With replacement and improvement etc., within should be included in the protection domain of the claims in the present invention.

Claims (10)

1. there is the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: include burner hearth and burner, described in add Thermal is arranged as the burning fume of described burner generation and can circulate inside described burner hearth.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described The ratio of the bottom of a pan volume of the standard circular bottom pot that burner hearth internal capacity is suitable with described burner hearth bore be more than 2.5, or, described stove The ratio of the bottom of a pan volume of the standard flat bottom pot that thorax internal capacity is suitable with described burner hearth bore is more than 2.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described The ratio of the bottom of a pan volume of the standard circular bottom pot that burner hearth internal capacity is suitable with described burner hearth bore is preferably greater than 4.5, or, The ratio of the bottom of a pan volume of the standard flat bottom pot that described burner hearth internal capacity is suitable with described burner hearth bore is preferably greater than 4.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Burner hearth be drum type, waist drum shape, calabash shaped, cylindrical shape, horn-like, fall funnel-form, cuboid, square or polyhedron-shaped.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Burner is air blast burner, and described burner is arranged on described burner hearth bottom center, the stove of the bottom of described burner hearth Exhaust opening it is further opened with on wall, or, described burner is arranged on the furnace wall of burner hearth, and the furnace wall of described burner hearth is further opened with Exhaust opening, described exhaust opening be positioned at on the furnace wall of described burner homonymy.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Burner is atmospheric burner, and described burner is arranged on described burner hearth bottom center, the stove around described burner Offer several auxiliary air air inlets in thorax bottom wall, the furnace wall of described burner hearth is further opened with exhaust opening.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Burner is made up of the grate using solid fuel, and described grate is arranged on described burner hearth bottom center, described burner hearth Furnace wall is provided with fire door, and the furnace wall of described burner hearth is further opened with exhaust opening.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Air blast burner is blast type fuel gas burner, and described blast type fuel gas burner has produced under rated heat input, rated heat load operating mode Burning fume is more than 1s in the time of staying within described burner hearth.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Heater also includes smoke exhaust barrel, and the exhaust opening of described burner hearth connects described smoke exhaust barrel;Described heater also includes tune Joint valve, described control valve is arranged on the flue between described exhaust opening and described smoke exhaust barrel or is arranged on described smoke evacuation On cylinder.
The most according to claim 1 have the round bottom of flue gas recirculation, flat vessel heater, it is characterised in that: described Heater also includes that ring-shaped flue, described ring-shaped flue ring are had mercy on described burner hearth, and described burner hearth is offered some the most equably Individual exhaust opening, several exhaust openings described connect described ring-shaped flue, and described ring-shaped flue connects described smoke exhaust barrel.
CN201610710040.4A 2016-08-23 2016-08-23 There is the round bottom of flue gas recirculation, flat vessel heater CN106225014A (en)

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CN105841346A (en) * 2016-04-12 2016-08-10 杜普利 Biomass type coal burning boiler
CN206281003U (en) * 2016-08-23 2017-06-27 广东工业大学 Round bottom with flue gas recirculation, flat vessel heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108204587A (en) * 2017-12-22 2018-06-26 郝名慧 A kind of fully premixed combustion system
CN108253419A (en) * 2017-12-22 2018-07-06 郝名慧 A kind of pneumatic power amplifier automatic regulating valve and its application

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