CN2878940Y - Gas fuel catalytic burner - Google Patents
Gas fuel catalytic burner Download PDFInfo
- Publication number
- CN2878940Y CN2878940Y CN 200620001009 CN200620001009U CN2878940Y CN 2878940 Y CN2878940 Y CN 2878940Y CN 200620001009 CN200620001009 CN 200620001009 CN 200620001009 U CN200620001009 U CN 200620001009U CN 2878940 Y CN2878940 Y CN 2878940Y
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- catalytic
- gas
- catalytic combustor
- combustion
- air
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Abstract
The utility model is a catalytic combustor for gas fuel, to be more specific, involving a catalytic combustor for heat supply or heating (hot wind) system. The pre-mixing chamber of the utility model is provided with air diversion pipe (2) and cyclone diversion facet (3) to enable fast and even mixture of gas and air within a tiny room; the catalytic combustion room consists of two sub-rooms, which divide the catalytic combustion area into rich zone and poor zone. A secondary gas or air mixing chamber (10) is provided between the two catalytic combustion sub-rooms. The mixing chamber is provided with tangential gas or air nozzle (11) to form whirls and enable fully secondary mixture of gas with air or gas. Between the pre-mixing room and first catalytic combustion room locates a perforated metal plate (4), to avoid backfire phenomena during ignition. The utility model realizes the purpose of high efficiency and low emission of the gas fuel (natural gas, coal gas or liquefied petroleum gas).
Description
Technical field
The utility model relates to a kind of catalytic burner that is used for heating or heating (hot blast) system, and its fuel is natural gas, and coal gas or liquefied petroleum gas belong to field of energy utilization.
Background technology
The gas combustion mode has diffusion combustion and premixed combustion, and both are flame combustion.Modern scientific research proves, flame combustion has two big fatal shortcomings: (1) flame combustion is the oxidation reaction of combustible substance under free radical participates in, the gas phase that relates to free radical (particularly oxygen radical) causes, generating portion excited electronic state product inevitably releases energy with the form of visible light.This part energy can't utilize and lose, and causes capacity usage ratio low.(2) initiation of the gas phase of free radical makes airborne nitrogen participate in combustion reaction and forms toxic pollutant NOx, and low efficiency of combustion produces considerable imperfect combustion HC and CO, enters atmosphere and can cause environmental pollution.
Solving one of the poor efficiency of flame combustion and effective way of maximum discharge is catalytic combustion, and it is low (＜1200 ℃, so NO to have an efficiency of combustion height (CO and imperfect combustion HC discharging are low), ignition temperature
XDischarge low), the combustion process stable and controllable (by control catalytic reaction) etc. advantage.Catalytic combustion be lower carbon number hydrocarbons in the oxidation reaction that catalyst surface carries out, be a kind of combustion system based on flameless combustion.
The catalytic combustion technology key in application is design, researches and develops out the efficient catalytic burner, at present, do not have similar catalytic burner on the market, and there is the high problem of NOx discharging in general conventional gas burner.Utilize the cooking stove of catalytic combustion technology, be difficult at industrial circle and get burner use as heating system.
The utility model content
The purpose of this utility model is problems such as high problem of the NOx discharging of the existing burner existence of solution and catalytic combustion cooking stove range of application are little, for catalytic combustion technology being applied to industrial heating, drying and heat supply field, a kind of gas fuel catalytic combustor of realizing efficient low-discharging is proposed.
The concrete technical scheme that the utility model adopted is referring to Fig. 1～Fig. 9.The utility model mainly is made up of premixer 1 and catalytic combustor, be provided with the airflow duct 2 that two opposite round tubes by two 1/4 circular arcs of air current flow direction are formed in the premixer 1, also be provided with whirlwind guide face 3, whirlwind guide face 3 is made up of the face of cylinder of four 1/4 circular arcs, two 1/4 arc radius of whirlwind guide face center be the outside two 1/4 arc radius 1/6～1/3, smooth connection between the circular arc cylinder.This structure makes air form two eddy current that direction of rotation is opposite in the premixer, and two tangent parts of air whirl are provided with the combustion gas nozzle of air supply, and combustion gas is mixed fully with air in air whirl.Catalytic combustor is made up of first catalytic combustor 5 and 9 two catalytic combustors of second catalytic combustor, first catalytic combustor, 5 bottoms are provided with 2～3 layers of catalyst for catalytic combustion layer 7 of the indoor installation of igniter 6, the first catalytic combustions, wherein the ground floor catalyst is Pt or Pd/CeO
2/ Al
2O
3/ ceramic honeycomb catalyst, the second layer and the 3rd layer of catalyst are CeO
2/ Mn base hexa-aluminate/honeycomb catalyst.The metallic porous sheet 4 that to be provided with an aperture between premixer 1 and the catalytic combustor be 0.5～5mm can increase gas flow rate, makes it greater than flame propagation velocity, occurs tempering phenomenon when preventing this device igniting.Indoor another catalyst for catalytic combustion layer 12 that is equipped with of second catalytic combustion is divided into 2～3 layers, and catalyst is CeO
2/ Mn base hexa-aluminate/honeycomb catalyst.The material of honeycomb substrate is violet mountain valley with clumps of trees and bamboo stone, mullite or metal beehive, and honeycomb hole can be square, parallelogram or circle, and the sectional area of honeycomb hole is 1～9mm
2Be provided with ceramic support ring 8 between each layer catalyst for catalytic combustion layer.Between first catalytic combustor 5 and second catalytic combustor 9, be provided with a secondary combustion gas or air mixing chamber 10, catalytic combustor is divided into two combustion zones, can realize respectively that rich combustion and poor combustion burn in that first catalytic combustor and second catalytic combustion are indoor, reach the control combustion process, reduce the purpose of discharging.Indoor four tangential combustion gas or the air nozzle 11 of being provided with of secondary combustion gas or air mixing chamber forms eddy flow, and secondary combustion gas or air are fully mixed with combustion gas.The center of first catalytic combustor 5 and second catalytic combustor 9 is provided with thermocouple sheath 17, can measure the temperature of each catalytic bed upper surface respectively, and cooperates the purpose that reaches controlled catalytic combustion with Automatic Control Unit and gas ratio valve.When using as heating equipment, this device is provided with tubular heat exchanger 13, if tubular heat exchanger is not installed, can provide temperature by this equipment is 800～1200 ℃ hot-air, can be applied to equipment such as industrial stoving.
Design principle of the present utility model is: catalytic combustion is the flameless combustion on catalyst surface, can reduce the maximum combustion temperature of burner, thereby reduces the generation of NOx.Because catalyst for catalytic combustion is cellular, combustion gas and air must fully mix before entering catalyst, and in addition, catalyticing combustion process is answered stable and controllable.Therefore, the utility model has designed (a) tangential eddy current pre-mixing apparatus, and combustion gas and air are mixed rapidly in very little space; (2) combustion zone is divided into two sections, and between the two stage combustion zone, designed secondary combustion gas (air) mixing chamber with four secondary combustion gas (air) tangential inlet nozzle, this design can be divided into the catalytic combustion zone fuel-rich region and fuel-poor region, or burning (or being called the secondary injection stratified combustion) in two stages, control and adjust the amount of main combustion gas and secondary combustion gas and air (or auxiliary air), can realize the even reliable and stable burning of combustion gas, and maximum combustion temperature is controlled at less than 1200 ℃, the NOx discharging that makes this equipment is less than 5ppm.
The utility model has been realized the purpose of gaseous fuel (natural gas, coal gas or liquefied petroleum gas) efficient low-discharging.
Description of drawings
The assembling schematic diagram of Fig. 1 gas fuel catalytic combustor;
Fig. 2 gas fuel catalytic combustor structure chart;
Fig. 3 combustion gas premixer vertical view;
Fig. 4 combustion gas premixer structure chart;
The structure chart of Fig. 5 porous plate;
Fig. 6 beds structure chart;
Fig. 7 secondary combustion gas (air) mixing chamber structure chart;
Fig. 8 tubular heat exchanger structure chart;
Fig. 9 gas fuel catalytic combustor Combustion Process Control flow chart, wherein, the top left side arrow is represented water inlet, right side arrow is represented water outlet, the catalyst layer at middle part is sent catalytic bed temperature signal 21 into electronic control unit 15, and electronic control unit 15 sends the air inflow that gas valve and air valve control signal 20 are controlled fuel gas 18 and air 19.
1, combustion gas premixer, 2, airflow duct, 3, the whirlwind guide face, 4, metallic porous sheet, 5, first catalytic combustor, 6, igniter, 7, the catalyst for catalytic combustion layer, 8, ceramic support ring, 9, second catalytic combustor, 10, secondary combustion gas or air mixing chamber, 11, combustion gas or air nozzle, 12, another catalyst for catalytic combustion layer, 13, tubular heat exchanger, 14, gas nozzle, 15, electronic control unit, 16, air inlet, 17, thermocouple sheath, 18, fuel gas, 19, air, 20, air valve control signal, 21, the catalytic bed temperature signal.
The specific embodiment
Referring now to accompanying drawing preferred embodiment of the present utility model is specifically described.
See figures.1.and.2, this catalytic combustion burner comprises: combustion gas premixer 1, first catalytic combustor 5, second catalytic combustor 9, secondary combustion gas or air mixing chamber 10,13 5 major parts of tubular heat exchanger.
When starting this burner, a small amount of combustion gas and air passing ratio control valve (not shown) spray into the combustion gas premixer from air inlet 16, wherein air sprays from the airflow duct 2 of two 1/4 circular arcs, under the effect of the cylindrical guide face 3 of two 1/4 circular arcs, form two eddy current that direction of rotation is opposite, combustion gas is sprayed by fuel gas inlet 14 at the tangent place of two rotating vortex, mix at combustion gas premix room air, participate in Fig. 3 and Fig. 4, then, air mixture is by expanded metal 4, referring to Fig. 5, form advection and enter first catalytic combustor, the porous metals panel aperture is 1.5mm, makes gas-flow speed greater than flame propagation velocity, occurs tempering phenomenon when preventing this device igniting.Then, air mixture is lighted in the expanded metal upper end, heat the catalyst in first catalytic combustor, when ground floor catalyst 7 upper surface temperature reach the initiation temperature of combustion gas on catalyst, electronic control unit 15 closed for 0.5 second with air and gas valve, naked light in first catalytic combustor is disappeared, and combustion gas directly contacts with catalyst layer 12 surfaces with catalyst layer 7, carries out catalytic combustion.Then, according to the flow that the temperature and the predetermined electric power of each catalytic bed 12 are regulated main combustion gas and air and secondary combustion gas and air, regulated quantity and frequency according to beds 12 temperature rises determine that can realize the dual area catalytic combustion of rich combustion and poor combustion this moment.Be provided with four tangential combustion gas (air) nozzle 11 in secondary combustion gas or the air mixing chamber 10, make auxiliary air (combustion gas) and main combustion gas mixing even, referring to Fig. 7.Can provide temperature by this equipment is 800～1200 ℃ hot-air, can be applied to equipment such as industrial stoving, as adds and load onto tubular heat exchanger 13 described in the utility model, and referring to Fig. 8, this equipment promptly can be applicable to heating system.The power of the utility model example device is 12-48kw/h.
Claims (8)
1, a kind of gas fuel catalytic combustor comprises premixer (1) and catalytic combustor, it is characterized in that: (1) internal face relative position is furnished with airflow duct (2) and whirlwind guide face (3) along the premixer, is symmetrical structure; Airflow duct (2) is made up of the round tube of two 1/4 circular arcs, the air inlet of air is located at the center of airflow duct, whirlwind guide face (3) is made up of the face of cylinder of four 1/4 circular arcs, two 1/4 arc radius of whirlwind guide face center are less than two 1/4 arc radius in the outside, smooth connection between the circular arc cylinder; Catalytic combustor is made up of first catalytic combustor (5) and (9) two catalytic combustors of second catalytic combustor, first catalytic combustor (5) bottom is provided with igniter (6), the indoor installation catalyst for catalytic combustion of first catalytic combustion layer (7), indoor another catalyst for catalytic combustion layer (12) that is equipped with of second catalytic combustion, between first catalytic combustor (5) and second catalytic combustor (9), be provided with a secondary combustion gas or air mixing chamber (10), indoor four tangential combustion gas or the air nozzle (11) of being provided with.
2, gas fuel catalytic combustor according to claim 1, it is characterized in that: in described premixer (1) two 1/4 arc radius of the center of whirlwind guide face (3) be the outside two 1/4 arc radius 1/6～1/3, the center of premixer is provided with gas nozzle (14).
3, gas fuel catalytic combustor according to claim 1 is characterized in that: be provided with a metallic porous sheet (4) between premixer (1) and first catalytic combustor (5), the aperture is 0.5～5mm.
4, gas fuel catalytic combustor according to claim 1 is characterized in that: the indoor catalyst for catalytic combustion layer (7) of described first catalytic combustion is divided into 2～3 layers.
5, gas fuel catalytic combustor according to claim 1 is characterized in that: the indoor catalyst for catalytic combustion layer (12) of described second catalytic combustion is divided into 2～3 layers.
6, according to claim 1 or 4 or 5 described gas fuel catalytic combustors, it is characterized in that: be provided with ceramic support ring (8) between each layer catalyst for catalytic combustion layer.
7, gas fuel catalytic combustor according to claim 1 is characterized in that: the center of described first catalytic combustor (5) and second catalytic combustor (9) is provided with thermocouple sheath (17).
8, gas fuel catalytic combustor according to claim 1 is characterized in that: tubular heat exchanger (13) is installed at the top of catalytic combustor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620001009 CN2878940Y (en) | 2006-01-18 | 2006-01-18 | Gas fuel catalytic burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620001009 CN2878940Y (en) | 2006-01-18 | 2006-01-18 | Gas fuel catalytic burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2878940Y true CN2878940Y (en) | 2007-03-14 |
Family
ID=37861359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620001009 Expired - Fee Related CN2878940Y (en) | 2006-01-18 | 2006-01-18 | Gas fuel catalytic burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2878940Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828137B (en) * | 2006-01-18 | 2010-05-12 | 北京工业大学 | Gas fuel catalytic combustor |
| CN104061575A (en) * | 2014-06-27 | 2014-09-24 | 启东市海信机械有限公司 | Coal gas dispersing ignition burner |
-
2006
- 2006-01-18 CN CN 200620001009 patent/CN2878940Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828137B (en) * | 2006-01-18 | 2010-05-12 | 北京工业大学 | Gas fuel catalytic combustor |
| CN104061575A (en) * | 2014-06-27 | 2014-09-24 | 启东市海信机械有限公司 | Coal gas dispersing ignition burner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |