CN106152500A - The flameless combustion burner hearth of a kind of heat exchange type and control method thereof - Google Patents
The flameless combustion burner hearth of a kind of heat exchange type and control method thereof Download PDFInfo
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- CN106152500A CN106152500A CN201610512122.8A CN201610512122A CN106152500A CN 106152500 A CN106152500 A CN 106152500A CN 201610512122 A CN201610512122 A CN 201610512122A CN 106152500 A CN106152500 A CN 106152500A
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- refractory material
- flue
- water cold
- temperature
- heat exchange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/44—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The invention discloses flameless combustion burner hearth and the control method thereof of a kind of heat exchange type.The refractory material flue of the present invention has flaring angle, and use multiple independent region water cold sleeves to carry out heat exchange control for the zones of different in refractory material flue, make to require to reduce to aphlogistic speed and dilution, and the flameless combustion of higher summation watt rating can be realized；High-temperature flue gas after burning can be back to front mixed zone more rapidly, the effect mixed in having reached to strengthen stove；Test result indicate that, after using the flue design of gradual-enlargement type, it is achieved the speed of aphlogistic combustion gas and oxidant can reduce by 20%, effectively reduces the power demand supplied gas；Meanwhile, after independent water cold sleeve heat exchange, the heat produced can be taken away timely and effectively, thus the summation watt rating in refractory material flue and temperature are controlled at aphlogistic optimum range in refractory material flue.
Description
Technical field
The present invention relates to combustion apparatus burner hearth, be specifically related to flameless combustion burner hearth and the control method thereof of a kind of heat exchange type.
Background technology
Flameless combustion (MILD Combustion, Flameless Combustion) possesses the characteristic of high-efficiency low-pollution, belongs to
In novel low NOx combusting technology, in the case of the current energy and environmental problem are increasingly severe, there is the biggest development and dive
Power.Compared to traditional combustion, it is achieved flameless combustion needs regulation burner hearth condition for import, fluid field in furnace and flue wall more accurately
Multiple conditions.Currently for aphlogistic implementation, it is largely focused on by controlling the speed of import reactant, temperature
Degree and dilute strength produce uniform reaction zone in making stove, thus realize flameless combustion.Only carry out real nothing by high-speed jet
Flame burning needs to consume more power compared to tradition flaming combustion, indirectly reduces the aphlogistic thermal efficiency.And
When burner hearth inner volume power is excessive, due to the unstability of turbulent flow, it is easily caused flashing of flame front, adds NOx's
Generate.Inventor is found through experiments, and changes the condition of furnace wall, can promote aphlogistic realization, reduces reaction-ure inlet
Speed, temperature and dilution requirement.The utility model of Application No. 200520071611.1 is stirred by burning in adding stove
The mode of device promotes aphlogistic foundation, and built-in heat storage strengthens the heat exchange in stove.The furnace wall of this invention contains
Part water pipe, formed water-cooling wall, but, it is inconsistent that such design causes furnace wall surrounding to be heated, can affect aphlogistic enter
Row and the stability of system.In the invention of Application No. 200510022667.2, the burner hearth of Flameless burning boiler uses water collar
Mode is conducted heat, but mainly rely on the pre-burning cover of burner hearth front end produce the pre-burning fume of high temperature again with secondary wind mixed combustion
Mode realizes flameless combustion, does not consider that water collar, for the impact of smouldering state in stove, is the most also susceptible to cold
The subcooled boiling phenomenon of water wall, thus cause the generation of incrustation scale.The invention of Application No. 200910185582.4 uses cold water
Pipe ring is around between flue and burner hearth, draws flameless combustion liberated heat, produces hot water or steam.This design is due to stove
Gallbladder size is less than normal, and when combustion power is the biggest, furnace wall temperature is too high is not easily accomplished flameless combustion on the contrary.
Summary of the invention
For above problems of the prior art, the present invention propose a kind of heat exchange type flameless combustion burner hearth and
By the heat exchange and geometry designs changing flue wall, control method, promotes that flameless combustion is formed.
It is an object of the present invention to propose the flameless combustion burner hearth of a kind of heat exchange type.
The flameless combustion burner hearth of the heat exchange type of the present invention includes: refractory material flue, water cold sleeve, heat-insulation layer, body of heater are tied
Structure shell, flameless combustion machine and exhanst gas outlet；Wherein, front mixed zone, primary response it are followed successively by from front to back in refractory material flue
District and smoke backflow district, the inwall of refractory material flue has flaring angle from front to back；Water cold sleeve is looped around refractory material stove
The lateral wall of gallbladder, water cold sleeve includes that multiple independent region water cold sleeve, each independent region water cold sleeve are respectively provided with
Respective water inlet and outlet, independent region water cold sleeve controls the region of the refractory material flue of respective institute cincture respectively
Heat exchange amount, or adjacent water inlet is connected with outlet and is together in series as an overall water cold sleeve；With multiple
Independent region water cold sleeve is corresponding, connects multiple temperature sensor on refractory material flue；Heat-insulation layer parcel fire proofed wood
Material flue and water cold sleeve；Furnace binding shell is arranged on outside heat-insulation layer；Flameless combustion machine sequentially pass through furnace binding shell and
Heat-insulation layer, is connected to the front end of refractory material flue；The rear end of refractory material flue connects exhanst gas outlet, and exhanst gas outlet is worn successively
Cross heat-insulation layer and furnace binding shell is externally connected；Fuel and oxidant are delivered in refractory material flue by flameless combustion machine
Portion, fuel and oxidant first mix with high-temperature flue gas in refractory material flue in front mixed zone, dilute and heat up, and arrive primary response
, there is combustion reaction and discharge heat in Qu Hou, after produced high-temperature flue gas arrives smoke backflow district, a part is arranged from flue
Going out, another part is then back to front mixed zone due to the effect of flowing, and the fuel come in conveying and oxidant continue to mix, as
This is repeated；The flaring angle of refractory material inboard wall of furnace makes velocity of flue gas reduce, and the static pressure in smoke backflow district is mixed higher than front
Close district, promote that the high-temperature flue gas in smoke backflow district is back to rapidly front mixed zone, mixed effect in enhancing flue, thus high temperature
Smoke backflow amount reaches to realize aphlogistic requirement；Independent region water cold sleeve is according to the thermometric of corresponding temperature sensor
As a result, the region of the refractory material flue of respective institute cincture is carried out independent heat exchange, takes away in time in refractory material flue
Heat, thus the summation watt rating in refractory material flue and temperature are controlled at aphlogistic optimum range.
Water cold sleeve includes 2～7 independent region water cold sleeves, when refractory material flue is longer, refractory material flue
A region multiple regions water cold sleeve can be set, and when fire material flue is shorter, two regions of refractory material flue can
Share a region water cold sleeve；Each independent region water cold sleeve is respectively provided with respective water inlet and outlet, utilizes
The size of inflow independently to control the heat exchange amount in different refractory material flue region；Or by adjacent water inlet and water outlet
Mouth can also be together in series as an overall water cold sleeve.With the front mixed zone in refractory material flue, main reaction region and
Smoke backflow district is corresponding, and water cold sleeve is divided into three independent region water cold sleeves, be looped around respectively each self-corresponding resistance to
The lateral wall in fire material flue region, the most front mixed zone water cold sleeve, main reaction region water cold sleeve and smoke backflow district water
Cold sleeve pipe, the separately heat exchange of regional in control refractory material flue；And there is the most independent water inlet
And outlet, front mixed zone water cold sleeve has front mixed zone cooling water inlet and front mixed zone coolant outlet, main reaction region
Water cold sleeve includes that main reaction region cooling water inlet and main reaction region coolant outlet, smoke backflow district water cold sleeve have flue gas
Recirculating zone cooling water inlet and smoke backflow district coolant outlet.
Outer side wall surface at refractory material flue has a depression consistent with the outer wall shape of water cold sleeve, thus water-cooled
Sleeve pipe half embeds the lateral wall of refractory material flue, to strengthen heat exchange.
Gap heat-preservation cotton or refractory cement between water cold sleeve and heat-insulation layer are filled, to reduce thermal loss.
The fuel of burning uses one or more in gaseous fuel, fuel oil, fire coal and biomass dyestuff fuel；Biomass
Dyestuff fuel is wood flour or stalk powder.
Cylindrically shaped or the square column type of refractory material flue.The axle section length-width ratio of refractory material flue main body exists
1.5:1～between 7:1.The flaring angle of refractory material flue, between 0～15 degree, is used for strengthening inner flue gas of the stove mixing.Fire proofed wood
The thickness of material flue is between 3cm～30cm；Use the corundum material that refractory temperature is not less than 1600 DEG C, or use polycrystalline not
Carry out the one in stone, aluminium silicate, aluminium oxide, magnesium oxide and zirconium oxide material.Temperature in refractory material flue maintains 800 DEG C
～between 1500 DEG C.Wherein, main reaction region and the temperature close in smoke backflow district, temperature difference is less than 20 DEG C, and front mixed zone temperature
Degree should be lower than the minimum temperature of main reaction region and smoke backflow district more than 50 DEG C, but still between 800 DEG C～1500 DEG C.
Water cold sleeve uses steel or aluminium, and coolant uses water or organic acid coolant.The diameter of water cold sleeve exists
Between 10mm～200mm.
Heat-insulation layer uses one or more in polycrystalline mullite, mineral wool, aluminium silicate and glass cotton.
The area of exhanst gas outlet accounts between 10%～70% of rear end inner bottom surface area of refractory material flue.
When using combustion gas or fuel oil, refractory material flue is horizontal, and when using solid fuel, refractory material flue is vertical
Formula, discharges flue gas and lime-ash below the charging of top.
Oxidant is air, or is the mixed gas of oxygen and noble gas.Such as use oxygen concentration in oxygen-enriched combusting
It it is the oxidant of 30%.
The present invention is promoting in the principle that flameless combustion realizes, and is clearly distinguished from tradition refractory material flue.Due to nothing
Flame burning need in the environment of high-temperature low-oxygen realize, the most traditional refractory material flue after being preheated to 800 DEG C, need by
The speed of combustion gas and oxidant is promoted to more than 20m/s, or substantial amounts of noble gas, as diluent, could realize nothing in addition
Flame burns.The present invention is found through experiments, and in flue, smoke backflow amount is the biggest, is more advantageously implemented flameless combustion.The present invention's
Refractory material flue has flaring angle, and flaring angle will make fluid velocity reduce, according to Bernoulli equation, the cigarette of flue
The front mixed zone of static pressure ratio, gas recirculating zone is slightly higher, and this pressure reduction will promote that the high temperature gases recirculating in smoke backflow district is to front mixed zone
In, now the smoke backflow amount in flue will be easier to realize high-temperature low-oxygen environment to promote aphlogistic foundation.Experiment knot
Fruit shows, after using the flue design of gradual-enlargement type, it is achieved the speed of aphlogistic combustion gas and oxidant can reduce by 20%, effectively
Reduce the power demand supplied gas.The present invention is also found by experiment, sets up air-breathing aphlogistic optimal volume merit
Rate and optimal in-furnace temperature scope are 100kW/m respectively3～700kW/m3, 800 DEG C～1500 DEG C.This is because work as summation watt rating
Or in-furnace temperature too low time, it may occur that flame-out phenomenon；And summation watt rating or in-furnace temperature too high time, flame propagation velocity can be bright
Aobvious increase, thus produce flame front, it is impossible to realize flameless combustion, and increasing considerably of nitrogen oxides can be caused.And it is right
After zones of different in refractory material flue uses multiple independent region water cold sleeves to carry out heat exchange control, can will burn
The heat produced is taken away timely and effectively, thus all controls realizing nonflame by the summation watt rating in refractory material flue and temperature
The optimum range of burning.
Further object is that the control method of the flameless combustion burner hearth that a kind of heat exchange type is provided.
The control method of the flameless combustion burner hearth of the heat exchange type of the present invention, comprises the following steps:
1) preheating refractory material flue is to more than 800 DEG C, in the multiple independent region water cold sleeve of water cold sleeve, adjacent
Water inlet be connected with outlet and be together in series as an overall water cold sleeve, control the heat that discharge taken away and be less than
The 10% of total combustion power；
2) flameless combustion machine is switched to smouldering state；
3) adjacent water inlet and outlet in areas of disconnection water cold sleeve, multiple regions water cold sleeve is independent mutually；
4) fuel and oxidant are delivered to inside refractory material flue by flameless combustion machine, control speed fuel 5m/s with
On, and the speed of oxidant is at more than 20m/s；
5) fuel and air enter in refractory material flue, and fuel and oxidant are first at front mixed zone and refractory material flue
Interior high-temperature flue gas mixes, and dilutes and heats up, and after arriving main reaction region, combustion reaction occurs and discharges heat, produced height
After temperature flue gas arrives smoke backflow district, a part is discharged from flue, and another part is then back to front mixing due to the effect of flowing
District, the fuel come in conveying and oxidant continue to mix, and are so repeated；The flaring angle of refractory material inboard wall of furnace makes
Fluid velocity reduces, and the static pressure in smoke backflow district is higher than front mixed zone, promotes that the high-temperature flue gas in smoke backflow district refluxes rapidly
To front mixed zone, strengthen mixed effect in flue, thus high temperature gases recirculating amount reaches to realize aphlogistic requirement；Independent
The region of the refractory material flue of respective institute cincture, according to the temperature-measuring results of corresponding temperature sensor, is entered by region water cold sleeve
The real-time independent heat exchange of row, takes away the heat in refractory material flue in time, thus by the summation watt rating in refractory material flue
Control at air-breathing aphlogistic optimum range with temperature.
Wherein, in step 5) in, the temperature in refractory material flue maintains between 800 DEG C～1500 DEG C；Wherein, main anti-
Answering district and the temperature close in smoke backflow district, temperature difference is less than 20 DEG C, and front mixed zone temperature should be returned than main reaction region and flue gas
The minimum temperature in stream district is low more than 50 DEG C, but still between 800 DEG C～1500 DEG C.
Advantages of the present invention:
The refractory material flue of the present invention has flaring angle, and uses many for the zones of different in refractory material flue
Individual independent region water cold sleeve carries out heat exchange control so that require to reduce to aphlogistic speed and dilution, and can
To realize the flameless combustion of higher summation watt rating；High-temperature flue gas after burning can be back to front mixed zone more rapidly, reaches
Strengthen the effect of mixing in stove.Test result indicate that, use gradual-enlargement type flue design after, it is achieved aphlogistic combustion gas and
The speed of oxidant can reduce by 20%, effectively reduces the power demand supplied gas；Meanwhile, after independent water cold sleeve heat exchange,
The heat produced in refractory material flue can be taken away timely and effectively, thus by the summation watt rating in refractory material flue and temperature
Degree control at aphlogistic optimum range, optimal volume power and optimal in-furnace temperature scope be respectively 100kW/m3～
700kW/m3,800 DEG C～1500 DEG C.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the flameless combustion burner hearth of the heat exchange type of the present invention；
Fig. 2 is the schematic diagram for Industrial Boiler of the flameless combustion burner hearth of the heat exchange type of the present invention；
Fig. 3 is the schematic diagram for heater for rolling steel of the flameless combustion burner hearth of the heat exchange type of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, by specific embodiment, the present invention is expanded on further.
As it is shown in figure 1, the flameless combustion burner hearth of the heat exchange type of the present embodiment includes: refractory material flue 2, water cold sleeve 3,
Heat-insulation layer 4, furnace binding shell 5, flameless combustion machine 1 and exhanst gas outlet 6；Wherein, in refractory material flue 2 the most successively
For front mixed zone 21, main reaction region 22 and smoke backflow district 23, the inwall of refractory material flue has flaring angle from front to back；Water
Cold sleeve pipe 3 is looped around the lateral wall of refractory material flue, correspond to three regions of refractory material flue, and water cold sleeve includes three
Individual independent region water cold sleeve, the most front mixed zone water cold sleeve, main reaction region water cold sleeve and smoke backflow district water-cooled
Sleeve pipe, has water inlet 31 and outlet 32, the water inlet 33 of main reaction region water cold sleeve of front mixed zone water cold sleeve and goes out
The mouth of a river 34, the water inlet 35 of smoke backflow district water cold sleeve and outlet 36；Refractory material flue connects three thermocouples
24, it is used for monitoring the wall surface temperature of refractory material flue, with the inflow of the region water cold sleeve of regulation correspondence in real time；Heat-insulation layer
4 parcel refractory material flue and water cold sleeves；Furnace binding shell 6 is arranged on outside heat-insulation layer；Flameless combustion machine 1 sequentially passes through stove
Body structural housing and heat-insulation layer, be connected to the front end of refractory material flue；The rear end of refractory material flue connects exhanst gas outlet 6,
Exhanst gas outlet sequentially passes through heat-insulation layer and furnace binding shell is externally connected.
In the present embodiment, refractory material flue 2 cylindrically shaped, axle section length-width ratio is 3:1；Refractory material stove
The flaring angle α of gallbladder is 5 degree；The thickness of refractory material flue is 8cm；Use the corundum material that refractory temperature is not less than 1600 DEG C；
Temperature in refractory material flue maintains about 1000 DEG C.Water cold sleeve 3 uses steel, and coolant uses water；Water cold sleeve
A diameter of 25mm；The area of exhanst gas outlet 6 accounts for the 20% of the rear end inner bottom surface area of refractory material flue.
Embodiment one
The flameless combustion burner hearth of the heat exchange type of the present embodiment is used for flameless combustion Industrial Boiler, as shown in Figure 2.First by resistance to
The wall of fire material flue utilizes the mode of flaming combustion to be preheated to 800 DEG C, and now the discharge of water cold sleeve 3 is few, the most not
Take away the heat of preheating refractory material flue.Hereafter, flameless combustion machine 1 is switched to smouldering state, simultaneously water cold sleeve 3
Independent heat exchange is carried out for three regions, dynamically regulates inflow according to the temperature-measuring results of thermocouple 24, make refractory material stove
The wall surface temperature of gallbladder is at about 1000 DEG C.After realizing flameless combustion, the high temperature low stain flue gas of generation is entered by exhanst gas outlet 6
Heat exchange is carried out with water in the heat-exchanging tube bundle 13 of two backhauls.Meanwhile, the hot water produced in water cold sleeve can input heat-exchanging tube bundle
In the tank of 13, effectively utilize cooling water and heat.Continuous heating, can produce required heating hot water or power steam.
When refractory material flue needs to improve output, the water yield of water cold sleeve strengthens the most accordingly so that in refractory material flue
The heat produced can shift a part and aphlogistic state in not affecting stove in time, it is to avoid the NOx produced due to high temperature；With
Time also make furnace wall surface temperature less than 1500 DEG C.
Embodiment two
The flameless combustion burner hearth of the heat exchange type of the present embodiment is used for flameless combustion heater for rolling steel, as shown in Figure 3.First will
The wall of refractory material flue utilizes the mode of flaming combustion to be preheated to 800 DEG C, and now the discharge of water cold sleeve 3 is few, substantially
Do not take away the heat of preheating refractory material flue.Hereafter, flameless combustion machine 1 is switched to smouldering state, owing to steel rolling adds
Heat needs substantial amounts of heat, and refractory material flue length and width are smaller simultaneously, and therefore water cold sleeve uses the mode of integrated water-cooling,
Whole refractory material flue is carried out heat exchange.Flue wall is maintained at about 1200 DEG C in this application example.Refractory material
The high-temperature flue gas that flue produces enters heating furnace burner hearth 15 by flue, and temperature, up to 1250 DEG C, can meet wanting of steel rolling heating
Ask.In this embodiment, the situation that the heat exchange amount of water cold sleeve compares Industrial Boiler is little, and the hot water of generation can be used as life heating
With.
It is finally noted that, publicize and implement the purpose of example and be that help is further appreciated by the present invention, but this area
Those of skill will appreciate that: without departing from the spirit and scope of the invention and the appended claims, various replacements and repairing
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with power
Profit claim defines in the range of standard.
Claims (10)
1. the flameless combustion burner hearth of a heat exchange type, it is characterised in that described flameless combustion burner hearth includes: refractory material flue,
Water cold sleeve, heat-insulation layer, furnace binding shell, flameless combustion machine and exhanst gas outlet；Wherein, in described refractory material flue in the past
Being followed successively by front mixed zone, main reaction region and smoke backflow district after to, the inwall of refractory material flue has flaring angle from front to back；
Described water cold sleeve is looped around the lateral wall of refractory material flue, and water cold sleeve includes multiple independent region water cold sleeve, often
Individual independent region water cold sleeve is respectively provided with respective water inlet and outlet, and independent region water cold sleeve controls respectively respectively
From the heat exchange amount in the region of the refractory material flue of institute's cincture, or adjacent water inlet is connected with outlet the work that is together in series
It it is an overall water cold sleeve；Corresponding with multiple independent region water cold sleeves, refractory material flue connect multiple
Temperature sensor；Described heat-insulation layer parcel refractory material flue and water cold sleeve；Described furnace binding shell is arranged on heat-insulation layer
Outward；Described flameless combustion machine sequentially passes through furnace binding shell and heat-insulation layer, is connected to the front end of refractory material flue；Fire proofed wood
The rear end of material flue connects exhanst gas outlet, and described exhanst gas outlet sequentially passes through heat-insulation layer and furnace binding shell is externally connected；
Fuel and oxidant are delivered to inside refractory material flue by flameless combustion machine, fuel and oxidant first in front mixed zone with fire-resistant
In material flue, high-temperature flue gas mixing, dilutes and heats up, and after arriving main reaction region, combustion reaction occurs and discharges heat, institute
After the high-temperature flue gas produced arrives smoke backflow district, a part is discharged from flue, and another part is then due to the effect backflow of flowing
To front mixed zone, the fuel come in conveying and oxidant continue to mix, and are so repeated；Refractory material inboard wall of furnace is gradually
Expanding angle makes velocity of flue gas reduce, and the static pressure in smoke backflow district is higher than front mixed zone, promotes the high-temperature flue gas in smoke backflow district
It is back to rapidly front mixed zone, strengthens mixed effect in flue, thus high temperature gases recirculating amount reaches to realize aphlogistic wanting
Ask；Independent region water cold sleeve is according to the temperature-measuring results of corresponding temperature sensor, the refractory material stove to the cincture of respective institute
The region of gallbladder carries out independent heat exchange, takes away the heat in refractory material flue in time, thus by the body in refractory material flue
Long-pending power and temperature control at aphlogistic optimum range.
2. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that in the lateral wall of refractory material flue
Surface has the depression consistent with the outer wall shape of water cold sleeve, thus water cold sleeve half embeds the outside of refractory material flue
Wall.
3. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that described water cold sleeve and heat-insulation layer it
Between gap heat-preservation cotton or refractory cement fill.
4. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that described fuel employing gaseous fuel,
One or more in fuel oil, fire coal and biomass dyestuff fuel.
5. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that the flaring of described refractory material flue
Angle is between 0～15 degree.
6. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that the shape of described refractory material flue
For cylindrical or square column type；The axle section length-width ratio of refractory material flue main body is between 1.5:1～7:1；Refractory material flue
Thickness between 3cm～30cm；Use refractory temperature to be not less than the corundum material of 1600 DEG C, or use polycrystalline mullite,
One in aluminium silicate, aluminium oxide, magnesium oxide and zirconium oxide material.
7. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that described heat-insulation layer uses polycrystalline not come
One or more in stone, mineral wool, aluminium silicate and glass cotton.
8. the flameless combustion burner hearth of heat exchange type as claimed in claim 1, it is characterised in that the area of exhanst gas outlet accounts for fire proofed wood
Between 10%～70% of the rear end inner bottom surface area of material flue.
9. the control method of the flameless combustion burner hearth of a heat exchange type, it is characterised in that described control method comprises the following steps:
1) preheating refractory material flue is to more than 800 DEG C, and in the multiple independent region water cold sleeve of water cold sleeve, adjacent enters
The mouth of a river is connected with outlet and is together in series as an overall water cold sleeve, and the heat that control discharge is taken away is less than total combustion
Burn the 10% of power；
2) flameless combustion machine is switched to smouldering state；
3) adjacent water inlet and outlet in areas of disconnection water cold sleeve, multiple regions water cold sleeve is independent mutually；
4) fuel and oxidant are delivered to inside refractory material flue by flameless combustion machine, control speed fuel at more than 5m/s,
And the speed of oxidant is at more than 20m/s；
5) fuel and air enter in refractory material flue, and fuel and oxidant are first high in front mixed zone with refractory material flue
Temperature flue gas mixing, dilutes and heats up, and after arriving main reaction region, combustion reaction occurs and discharges heat, produced high temperature cigarette
After gas arrives smoke backflow district, a part is discharged from flue, and another part is then back to front mixed zone due to the effect of flowing, with
Fuel and oxidant that conveying is come in continue mixing, are so repeated；The flaring angle of refractory material inboard wall of furnace makes fluid
Speed reduces, and the static pressure in smoke backflow district is higher than front mixed zone, before promoting that the high-temperature flue gas in smoke backflow district is back to rapidly
Mixed zone, strengthens mixed effect in flue, thus high temperature gases recirculating amount reaches to realize aphlogistic requirement；Independent region
Water cold sleeve, according to the temperature-measuring results of corresponding temperature sensor, carries out reality to the region of the refractory material flue of respective institute cincture
Shi Duli heat exchange, takes away the heat in refractory material flue in time, thus by the summation watt rating in refractory material flue and temperature
Degree controls at air-breathing aphlogistic optimum range.
10. control method as claimed in claim 9, it is characterised in that in step 5) in, the temperature dimension in refractory material flue
Hold between 800 DEG C～1500 DEG C；Wherein, the temperature difference in main reaction region and smoke backflow district is less than 20 DEG C；Front mixed zone temperature
Should be lower than the minimum temperature of main reaction region and smoke backflow district more than 50 DEG C.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111723538A (en) * | 2020-08-21 | 2020-09-29 | 四川大学 | Numerical value judgment method for flameless combustion state in non-premixed combustion process |
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