CN110107899A - Low concentration gas pulsating combusting device and its method with flame holder structure - Google Patents
Low concentration gas pulsating combusting device and its method with flame holder structure Download PDFInfo
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- CN110107899A CN110107899A CN201910206315.4A CN201910206315A CN110107899A CN 110107899 A CN110107899 A CN 110107899A CN 201910206315 A CN201910206315 A CN 201910206315A CN 110107899 A CN110107899 A CN 110107899A
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- 238000000034 method Methods 0.000 title claims description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 103
- 230000010349 pulsation Effects 0.000 claims abstract description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 157
- 239000007789 gas Substances 0.000 claims description 138
- 241000237942 Conidae Species 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000000567 combustion gas Substances 0.000 claims description 3
- 208000002925 dental caries Diseases 0.000 claims description 3
- 210000003516 pericardium Anatomy 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims 3
- 239000007924 injection Substances 0.000 claims 3
- 238000013461 design Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000001535 kindling effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/28—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid in association with a gaseous fuel source, e.g. acetylene generator, or a container for liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses the low concentration gas pulsating combusting devices with flame holder structure, the low concentration pulsation gas supply pipe including two side-by-side parallels；It further include columnar gas isocon, the outlet side of the two low concentration pulsation gas supply pipes is respectively perpendicular the both ends that connection connects the gas isocon；The gas isocon is also provided with and communicated with several flame holders far from the side of low concentration pulsation gas supply pipe, and each flame holder is equally spaced along the axis direction of the gas isocon；Flame holder structure is added in the present invention, preferably velocity field, discharge uniformity can be obtained under the optimizing design scheme, while having widened the speed limit of combustor air inlet, combustion stability is greatly enhanced；The structure for also adding enriching in this programme at the same time, solving the problems, such as that concentration is too low can not continuous burning.
Description
Technical field
The invention belongs to gas combustions to utilize field.
Background technique
Coal resources in China is although very rich, but coal seam has quite a few to be in high methane or outburst coal
Layer, about 48%, directly result in the reserves of China's gas resources also very abundant, from the point of view of the coal mine gas drainage in China, mostly
Gas drainage is mixed into that air is more and in the form of a single, extraction amount it is fluctuated, cause during extraction to be concentration mostly 8%
The low concentration gas of left and right, 70% or more accounting extraction total amount is even more, this part gas density is relatively low, uses routine
Combustion system is difficult to maintain it to stablize burning, while the concentration is also at the concentration of gas explosion, if cannot be by reasonable benefit
The gas that with can only so be discharged into atmosphere, otherwise will cause security risk, therefore be largely in the concentration is extracted next rear general
All it is to be put to idle discharge, was once reported in 2006, China there are the gas reserves of 36 tcms, and content is substantially land natural
The reserves of gas, and according to incompletely statistics the annual coal mining in China will about 150 billion cubic meter of idle discharge gas, not only cause
Serious potentiality energy waste, also pollutes the environment.
It is known that the main component methane of gas, is a kind of serious greenhouse gases, greenhouse effects and CO2It compares,
It is its 24.6 times, is even more CO to the ability for destroying atmospheric ozone layer27 times.Therefore a large amount of low concentration gas of annual mine
Idle discharge is put because that can not utilize, is not only the serious waste to limited non-renewable fossil energy, while also result in
Greenhouse effects and increasing environmental pollution.Its combustion heat value of gas is in 35000~39000kJ/m3Between, becoming greenhouse gases
Also play the role of high-grade energy simultaneously, comparable to conventional gas, it can be used as the raw material of derived energy chemical process.
But as the term suggests low concentration gas, extremely low for the ingredient of burning, generated heat is much smaller than in combustion process
Heat dissipation capacity into environment, sustained combustion is extremely difficult, therefore cannot be burnt using conventional burner, therefore right
Special combustion system and corresponding burner must be used in the low concentration gas for being in the concentration.
Intermittent combustion as a kind of special combustion system, neither detonation also Abnormal combustion but intermediate.It gives
The excitation for giving its certain condition, the acoustics pulsation for generating it and the thermal pulse generated in combustion process reach certain sound thermal coupling
It closes, periodic intermittent combustion can be generated.The characterization such as pressure, temperature and rate of heat release combustion characteristics in combustion process
State parameter does periodic variation at any time, have high burning efficiency, larger heat transfer coefficient, smaller discharge amount of pollution, can be with
The advantages of self-absorption pressurizing, the burning of low concentration gas can be effectively treated using pulsating Combustion Technology；
Since the concentration in gas source is not stationary value, from the low concentration gas in supervisor's indentation combustion chamber, there may be methane
The too low problem of concentration, even if there is also can not be successfully to light or nothing in combustion chamber in the case of combustion chamber is pulsed and supplied
Method keeps the continuity of multiple pulsation period burnings.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of steady flame of combustion stablized band
The low concentration gas pulsating combusting device of device structure.
Technical solution: to achieve the above object, the low concentration gas pulsating combusting device of the invention with flame holder structure, packet
Include the low concentration pulsation gas supply pipe of two side-by-side parallels；It further include columnar gas isocon, the two low concentration pulsation
The outlet side of gas supply pipe is respectively perpendicular the both ends that connection connects the gas isocon；The gas isocon is far from described
The side of low concentration pulsation gas supply pipe is also provided with and communicated with several flame holders, and each flame holder is along the gas isocon
Axis direction be equally spaced；
The outlet end of each flame holder is respectively connected with burner, and each burner is communicated with far from one end of flame holder
Exhaust nozzle.
Further, sequentially coaxially pericardium includes the first cylindrical section in structural pipe wall, cone column to the flame holder from left to right
Section, the second cylindrical section, third cylindrical section；First cylindrical section is identical as the diameter of third cylindrical section, described to bore the thick of shell of column
End is connected to connection with the first cylindrical section, and the taper end of the cone shell of column connects the third cylindrical section by the connection of the second cylindrical section；
The left end bypass of first cylindrical section connects the inner cavity of the gas isocon, the concentric company of right end of the third cylindrical section
Lead to the combustion chamber in the burner.
Further, the left side of the third cylindrical section is symmetrical above and below is provided with steady flame protrusion and lower steady flame protrusion, institute
The inside for stating steady flame protrusion and lower steady flame protrusion is steady flame cavity, and the two steady flame cavitys are connected to the third cylindrical section
Inner cavity；The upper and lower sides of second cylindrical section have also been symmetrically arranged steady flame inclined tube and lower steady flame inclined tube；It is described steady
The steady flame cavity of the upper steady flame lobed interior and the inner cavity of cone shell of column are interconnected by flame inclined tube；The lower steady flame inclined tube is by institute
The inner cavity of the steady flame cavity and cone shell of column of stating lower steady flame lobed interior is interconnected；The upper steady flame inclined tube and lower steady flame inclined tube with
The second cylindrical section axis is in the angle of 40 to 50 degree；
The two sides of second cylindrical section have also been symmetrically arranged two straight steady flame tubes, the axis of the two straight steady flame tubes
It is contour with the axis of second cylindrical section and be parallel to each other；The both ends of each straight steady flame tube are respectively communicated with the cone shell of column
Inner cavity and third cylindrical section inner cavity.
Further, the burner is cylindrical barrel body structure, and the burner internal is columnar combustion chamber, the combustion
It burns interior and is provided with igniter, the cylinder periphery integrated coaxial heart of the burner is provided with distribution ring body, the distribution
It is concentric in ring body to be provided with cricoid pure methane pressure accumulating chamber, by heat exchange wall between the pure methane pressure accumulating chamber and the combustion chamber
Body separates；It is additionally provided with several methane enrichings channel in the distributing ring body, each methane enriching channel is by the pure methane
Pressure accumulating chamber and the combustion chamber are interconnected, and the enriching export direction in methane enriching channel and the axis of the combustion chamber hang down
Directly；It further include pressurization pure methane supply pipe, the outlet side of the pressurization pure methane supply pipe is connected to the pure methane pressure accumulating chamber, institute
State the piston valve passage for being additionally provided in distributing ring body and intersecting vertically with methane enriching channel；It is living in the piston valve passage
Dynamic to be provided with piston valve core, the propulsion of the piston valve core can block methane enriching channel；It further include electromagnetism push-rod electric machine,
The push rod end of the electromagnetism push-rod electric machine is drivingly connected the piston valve core；The electromagnetism push-rod electric machine passes through the push rod band
Move the propulsion and retraction of the piston valve core.
Further, the method for the low concentration gas pulsating combusting device with flame holder structure:
Gas source is to include CH4、O2、N2、CO2Mixed gas, wherein O2The enough CH of concentration4Combustion reaction:
CH in gas source4When concentration is more than 4%, do not have to carry out CH to combustion chamber4Enriching；Each electromagnetism push rod electricity is controlled at this time
Machine pushes ahead each piston valve core to closure methane enriching channel；Then under the action of gas pump that gas is low by two
Concentration fluctuation gas supply pipe continuously supplies gas into gas isocon in the form of the pulsation period；And then make the interior of isocon
Portion forms continuous pulsation air pressure, and then the gas in isocon is in spraying into combustion chamber for pulsation period by several flame holders
Penetrate methane gas；Indoor gas burn after igniter is lighted, forms continuous pulsating flame in combustion chamber, and then burn
Interior is sprayed because the high-temperature tail gas that burning generates continues through exhaust nozzle in the form of wake flame, and then each exhaust nozzle is sprayed
Wake flame out heats heating equipment；The utilization to gas is realized in turn；
As CH in gas source4When concentration is less than 4%, gas is passed through into two low concentrations pulsation gas under the action of gas pump
Supply pipe continuously supplies gas into gas isocon in the form of the pulsation period；And then form the inside of isocon continuously
Pulsation air pressure, and then the gas in isocon sprays methane gas into combustion chamber in the pulsation period by several flame holders；
Due to passing through CH in the methane gas that several flame holders are sprayed into combustion chamber4Concentration can not be successfully a little in combustion chamber less than 4%
The continuity that fires or cannot keep multiple pulsation period burnings, needs to carry out CH to combustion chamber4Enriching；It is pressurized pure methane at this time
Pure methane is pressed into pure methane pressure accumulating chamber by supply pipe, and is pressurized pure methane supply pipe and is persistently maintained pure methane pressure accumulation indoor
Air pressure, then each electromagnetism push-rod electric machine of synchronous averaging, makes each piston valve core do flexible advancing movement in periodical, and then make methane
Enriching channel exports the enriching in methane enriching channel in periodically into combustion chamber in periodically blocking and unimpeded
Spray pure CH4, by the frequency of the flexible advancing movement of control piston valve core, export enriching and spray pure CH into combustion chamber4's
Period and step and flame holder spray the period of gas to combustion chamber and act in agreement；And then it realizes to pulsation each in combustion chamber
Combustion period has all carried out combustion gas enriching, guarantees that combustion chamber can continuous intermittent combustion；And then the burning generation of combustion chamber internal cause
High-temperature tail gas is continued through exhaust nozzle and is sprayed in the form of wake flame, and then the wake flame that each exhaust nozzle is sprayed is set to heat
It is standby to be heated；The utilization to gas is realized in turn；The indoor pure methane gas of pure methane pressure accumulation can be by changing at the same time
Hot wall body absorbs the heat that generates after burning Indoor Combustion, and then enriching is made to export having been warmed up of spraying into combustion chamber
Pure CH4, and then effectively improve the indoor efficiency of combustion of burning.
The utility model has the advantages that flame holder structure is added in the present invention, dual reflux area is generated in a combustion chamber, inside its flame holder
A pair of of recirculating zone is formd, the flame holding during kindling is enhanced, has widened the gas flow rate upper limit into burner,
Preferably velocity field, discharge uniformity can be obtained under the optimizing design scheme, combustion stability is greatly enhanced；With this
The structure of enriching is also added in this programme simultaneously, solving the problems, such as that concentration is too low can not continuous burning.
Detailed description of the invention
Attached drawing 1 is gas pulsating combusting device overall structure diagram；
Attached drawing 2 is burner bulk velocity cloud atlas；
Attached drawing 3 is the partial elevation view at the appended drawing reference 114 of attached drawing 1；
Attached drawing 4 is the cutting face velocity cloud atlas of flame holder；
Attached drawing 5 is local velocity's polar plot of attached drawing 4；
Attached drawing 6 is burner structure cross-sectional view；
Attached drawing 7 is that each exhaust nozzle exports the flow line chart under different second cylindrical section inner diameter holes.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
With the low concentration gas pulsating combusting device of flame holder structure as shown in attached drawing 1 to 7, including two side-by-side parallels
Low concentration pulsation gas supply pipe 13；It further include columnar gas isocon 12, the two low concentrations pulsation gas supply pipes 13
Outlet side be respectively perpendicular the both ends that connection connects the gas isocon 12；The gas isocon 12 is far from the low concentration
The side of pulsation gas supply pipe 13 is also provided with and communicated with several flame holders 9, and each flame holder 9 is along the gas isocon 12
Axis direction be equally spaced；9 quantity of flame holder of the present embodiment is 10；
The outlet end of each flame holder 9 is respectively connected with burner 8, and each burner 8 connects far from one end of flame holder 9
It is connected with exhaust nozzle 10.
Sequentially coaxially pericardium includes the first cylindrical section 4 in structural pipe wall, cone shell of column 3, second to the flame holder 9 from left to right
Cylindrical section 7, third cylindrical section 2；First cylindrical section 4 is identical as the diameter of third cylindrical section 2, the butt end of the cone shell of column 3
Connection is connected to the first cylindrical section 4, the taper end of the cone shell of column 3 connects the third cylindrical section by the connection of the second cylindrical section 7
2；The left end bypass of first cylindrical section 4 connects the inner cavity of the gas isocon 12, and the right end of the third cylindrical section 2 is same
Axle center is connected to the combustion chamber 22 in the burner 8.
The left side of the third cylindrical section 2 is symmetrical above and below to be provided with steady flame protrusion 6.1 and lower steady flame protrusion 6.2, described
The inside of upper steady flame protrusion 6.1 and lower steady flame protrusion 6.2 is steady flame cavity, and the two steady flame cavitys are connected to the third circle
The inner cavity of shell of column 2；The upper and lower sides of second cylindrical section 7 have also been symmetrically arranged steady flame inclined tube 5.1 and lower steady flame inclined tube
5.2；The upper steady flame inclined tube 5.1 mutually interconnects the inner cavity of steady flame cavity and cone shell of column 3 inside the upper steady flame protrusion 6.1
It is logical；The inner cavity of steady flame cavity and cone shell of column 3 inside the lower steady flame protrusion 6.2 is interconnected by the lower steady flame inclined tube 5.2；
The upper steady flame inclined tube 5.1 and lower steady flame inclined tube 5.2 and 7 axis of the second cylindrical section are in the angle of 40 to 50 degree；
The two sides of second cylindrical section 7 have also been symmetrically arranged two straight steady flame tubes 1, the two straight steady flame tubes 1
The axis of axis and second cylindrical section 7 is contour and is parallel to each other；The both ends of each straight steady flame tube 1 are respectively communicated with described
Bore the inner cavity of shell of column 3 and the inner cavity of third cylindrical section 2.
The burner 8 is cylindrical barrel body structure, is columnar combustion chamber 22, the combustion chamber inside the burner 8
Igniter is provided in 22, the cylinder periphery integrated coaxial heart of the burner 8 is provided with distribution ring body 50, the distribution
It is concentric in ring body 50 to be provided with cricoid pure methane pressure accumulating chamber 14, between the pure methane pressure accumulating chamber 14 and the combustion chamber 22
Separated by heat exchange wall body 03；Several methane enrichings channel 15 is additionally provided in the distribution ring body 50, each methane enriching is logical
The pure methane pressure accumulating chamber 14 and the combustion chamber 22 are interconnected by road 15, the enriching outlet 20 in methane enriching channel 15
Direction is vertical with the axis of the combustion chamber 22；It further include pressurization pure methane supply pipe 21, the pressurization pure methane supply pipe 21
Outlet side be connected to the pure methane pressure accumulating chamber 14, be additionally provided in the distribution ring body 50 and hang down with methane enriching channel 15
The piston valve passage 17 directly intersected；Piston valve core 16 is movably set in the piston valve passage 17, the piston valve core 16
Propulsion can block methane enriching channel 15；It further include electromagnetism push-rod electric machine 18, the push rod 19 of the electromagnetism push-rod electric machine 18
End is drivingly connected the piston valve core 16；The electromagnetism push-rod electric machine 18 drives the piston valve core 16 by the push rod 19
Propulsion and retraction.
The concrete operation method of this programme, process and technological progress arrange:
Gas source is to include CH4、O2、N2、CO2Mixed gas, wherein O2The enough CH of concentration4Combustion reaction:
CH in gas source4When concentration is more than 4%, do not have to carry out CH to combustion chamber 224Enriching；Each electromagnetism push rod is controlled at this time
Motor 18 pushes ahead each piston valve core 16 to closure methane enriching channel 15；Then by gas under the action of gas pump
Gas continuously is supplied into gas isocon 12 by way of two low concentrations pulse gas supply pipe 13 in the pulsation period；In turn
The inside of isocon 12 is set to form continuous pulsation air pressure, and then the gas in isocon 12 is in pulsation by several flame holders 9
Period sprays methane gas into combustion chamber 22；Gas in combustion chamber 22 is after igniter is lighted, shape in combustion chamber 22
At continuous pulsating flame, and then the high-temperature tail gas that the burning of 22 internal cause of combustion chamber generates continues through exhaust nozzle 10 with wake flame
Form sprays, and then the wake flame that each exhaust nozzle 10 is sprayed heats heating equipment；And then it realizes to gas
It utilizes；
As CH in gas source4When concentration is less than 4%, gas is passed through into two low concentrations pulsation gas under the action of gas pump
Supply pipe 13 continuously supplies gas into gas isocon 12 in the form of the pulsation period；And then form the inside of isocon 12
Continuous pulsation air pressure, and then the gas in isocon 12 is in spraying into combustion chamber 22 for pulsation period by several flame holders 9
Penetrate methane gas；Due to passing through CH in the methane gas that several flame holders 9 are sprayed into combustion chamber 224Concentration is less than 4%, burning
It can not be successfully the continuity that lights or cannot keep multiple pulsation period burnings in room 22, need to carry out CH to combustion chamber 224
Enriching；Pure methane is pressed into pure methane pressure accumulating chamber 14 by pressurization pure methane supply pipe 21 at this time, and is pressurized pure methane supply pipe
21 persistently maintain the air pressure in pure methane pressure accumulating chamber 14, and then each electromagnetism push-rod electric machine 18 of synchronous averaging, makes each piston valve core 16
In periodically doing flexible advancing movement, and then make methane enriching channel 15 in periodically blocking and unimpeded, and then adds methane
The enriching outlet 20 in dense channel 15 is in that pure CH is periodically sprayed into combustion chamber 224, pass through the flexible of control piston valve core 16
The frequency of advancing movement makes enriching outlet 20 spray pure CH into combustion chamber 224Period and step and flame holder 9 to combustion chamber
22 spray the period of gas and act in agreement；And then realize that having carried out combustion gas to the intermittent combustion period each in combustion chamber 22 adds
It is dense, guarantee that combustion chamber 22 can continuous intermittent combustion；And then the high-temperature tail gas that the burning of 22 internal cause of combustion chamber generates continues through tail
Gas blowout pipe 10 is sprayed in the form of wake flame, and then the wake flame that each exhaust nozzle 10 is sprayed heats heating equipment；Into
And realize the utilization to gas；The pure methane gas in pure methane pressure accumulating chamber 14 can be absorbed by heat exchange wall body 03 at the same time
The heat generated after burning in combustion chamber 22, so make that enriching outlet 20 sprays into combustion chamber 22 be have been warmed up it is pure
CH4, and then effectively improve the efficiency of combustion in combustion chamber 22.
The reasonable structure of burner and technological progress are verified using CFD method for numerical simulation:
Use the numerical simulation completed under the grid with ANSYS Fluent16.0, first inspection grid, it is ensured that its grid
Area and volume do not have the presence of negative value, do not consider that gravity influences.
In a model, setting flow process is the steady-flow based on pressure, simultaneously because our major concern low concentrations
The flow condition of gas, it is therefore assumed that fluid is CH4With the gaseous mixture of air, it is calculated using Multicomponent Model numerical value and is being burnt
Flow Field Distribution situation in device pipeline.
Model setting: energy equation, standard K-ε Equations of Turbulence, component transport equation；
Material setting: fluid methane-air, solid wall surface are default aluminum；
Boundary condition setting: entrance boundary condition: speed entrance, the supply speed of setting low concentration pulsation gas supply pipe 13
Degree is 1.5m/s；Export boundary condition: exhaust nozzle 10 is pressure export；Turbulence indicator: turbulence intensity+hydraulic diameter；
Temperature: 300K；
Component: 4%CH4, 19.74%O2, 2.82%CO2, 73.44%N2；
Method for solving: SIMPLE single precision, gradient are based on grid and use least square method, and pressure uses Second-order Up-wind, move
Windward using single order, windward using single order, turbulence dissipation rate uses single order windward to Turbulent Kinetic to amount；
Residual error monitoring: all parameter convergence precisions are set as 0.001；
Iteration step length: 1000；
It initializes, in calculating process, in 324 step, indices converge to setting accuracy；
The burner bulk velocity cloud atlas such as attached drawing 2 obtained after simulation, the cutting face velocity cloud atlas of flame holder 9 are for example attached
Fig. 4；The cutting plane speed vector figure of flame holder 9 such as attached drawing 5；By speed cloud atlas can be seen that double air inlets add 9 structure of flame holder into
Gas can obtain preferable velocity field.Simultaneously because the presence of flame holder 9, in addition to generating dual reflux area in combustion chamber steady 22,
A pair of of recirculating zone is also formed inside its flame holder 9, enhances the flame holding during kindling, has been widened into burner 8
The interior gas flow rate upper limit.For the contingency for preventing result, this has carried out the inner diameter hole ruler of 4 groups of different second cylindrical sections 7 altogether
Simulation under very little, analog result are as shown in the table:
Draw the flow line chart such as Fig. 7 of its each outlet of exhaust nozzle 10 under the inner diameter hole of different second cylindrical sections 7
It is shown: from tables of data it can be seen that the case where the internal diameter pore size of each second cylindrical section 7 is 25mm, 45mm, 65mm
Under can guarantee its discharge uniformity, but there is slightly larger flow when the internal diameter pore size of the second cylindrical section 7 is 100mm
Deviation.The reason is that becoming large-sized, though each pipe drag overall becomes smaller, resistance difference becomes larger.Even so in practical projects
It is able to satisfy required precision.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. the low concentration gas pulsating combusting device with flame holder structure, it is characterised in that: the low concentration including two side-by-side parallels
It pulses gas supply pipe (13)；It further include columnar gas isocon (12), two low concentration pulsation gas supply pipe (13)
Outlet side be respectively perpendicular the both ends that connection connects the gas isocon (12)；The gas isocon (12) is far from described low
The side of concentration fluctuation gas supply pipe (13) is also provided with and communicated with several flame holders (9), and each flame holder (9) is along described watt
The axis direction of this isocon (12) is equally spaced；
The outlet end of each flame holder (9) is respectively connected with burner (8), and the one of each burner (8) separate flame holder (9)
End is communicated with exhaust nozzle (10).
2. with the low concentration gas pulsating combusting device of flame holder structure shown according to claim 1, it is characterised in that: described steady
Sequentially coaxially pericardium includes the first cylindrical section (4) in structural pipe wall, cone shell of column (3), the second cylindrical section to flame device (9) from left to right
(7), third cylindrical section (2)；First cylindrical section (4) is identical as the diameter of third cylindrical section (2), cone shell of column (3)
Butt end is connected to connection with the first cylindrical section (4), and the taper end of cone shell of column (3) passes through described in the second cylindrical section (7) connection connection
Third cylindrical section (2)；The left end bypass of first cylindrical section (4) connects the inner cavity of the gas isocon (12), and described the
Combustion chamber (22) in the concentric connection burner (8) of the right end of three cylindrical sections (2).
3. with the low concentration gas pulsating combusting device of flame holder structure according to shown in claim 2, it is characterised in that: described
The left side of three cylindrical sections (2) is symmetrical above and below to be provided with raised (6.1) the He Xiawen flame protrusion (6.2) of steady flame, and the upper steady flame is convex
The inside for playing (6.1) He Xiawen flame raised (6.2) is steady flame cavity, and the two steady flame cavitys are connected to the third cylindrical section
(2) inner cavity；It is oblique that the upper and lower sides of second cylindrical section (7) have also been symmetrically arranged steady flame inclined tube (5.1) He Xiawen flame
It manages (5.2)；The upper steady flame inclined tube (5.1) by the internal steady flame cavity of the upper steady flame raised (6.1) with bore the interior of shell of column (3)
Chamber is interconnected；The lower steady flame inclined tube (5.2) steady flame cavity and cone shell of column (3) that the lower steady flame raised (6.2) is internal
Inner cavity be interconnected；Upper steady flame inclined tube (5.1) the He Xiawen flame inclined tube (5.2) is in the second cylindrical section (7) axis
The angle of 40 to 50 degree；
The two sides of second cylindrical section (7) have also been symmetrically arranged two straight steady flame tubes (1), the two straight steady flame tubes (1)
Axis and second cylindrical section (7) axis it is contour and be parallel to each other；The both ends of each straight steady flame tube (1) connect respectively
Lead to the inner cavity of cone shell of column (3) and the inner cavity of third cylindrical section (2).
4. the low concentration gas pulsating combusting device according to claim 1 with flame holder structure, it is characterised in that: the combustion
Burner (8) is cylindrical barrel body structure, is columnar combustion chamber (22) inside the burner (8), sets in the combustion chamber (22)
It is equipped with igniter, the cylinder periphery integrated coaxial heart of the burner (8) is provided with distribution ring body (50), the distributing ring
It is concentric in body (50) to be provided with cricoid pure methane pressure accumulating chamber (14), the pure methane pressure accumulating chamber (14) and the combustion chamber
(22) separated between by heat exchange wall body (03)；It is additionally provided with several methane enrichings channel (15) in the distribution ring body (50), respectively
The pure methane pressure accumulating chamber (14) and the combustion chamber (22) are interconnected by methane enriching channel (15), and the methane adds
Enriching outlet (20) direction of dense channel (15) is vertical with the axis of the combustion chamber (22)；It further include pressurization pure methane supply pipe
(21), the outlet side of pressurization pure methane supply pipe (21) is connected to the pure methane pressure accumulating chamber (14), the distribution ring body
(50) the piston valve passage (17) to intersect vertically with methane enriching channel (15) is additionally provided in；The piston valve passage
(17) it is movably set with piston valve core (16) in, the propulsion of the piston valve core (16) can block methane enriching channel
(15)；It further include electromagnetism push-rod electric machine (18), push rod (19) end of the electromagnetism push-rod electric machine (18) is drivingly connected the work
Plug valve core (16)；The electromagnetism push-rod electric machine (18) drives the propulsion and contracting of the piston valve core (16) by the push rod (19)
It returns.
5. the method for the low concentration gas pulsating combusting device according to claim 4 with flame holder structure, it is characterised in that:
Gas source is to include CH4、O2、N2、CO2Mixed gas, wherein O2The enough CH of concentration4Combustion reaction:
CH in gas source4When concentration is more than 4%, do not have to carry out CH to combustion chamber (22)4Enriching；Each electromagnetism push rod electricity is controlled at this time
Machine (18) pushes ahead each piston valve core (16) to closure methane enriching channel (15)；It then will under the action of gas pump
Gas continuously supply into gas isocon (12) by way of two low concentrations pulsation gas supply pipe (13) is in the pulsation period
Gas；And then so that the inside of isocon (12) is formed continuous pulsation air pressure, and then the gas in isocon (12) pass through it is several
Flame holder (9) sprays methane gas into combustion chamber (22) in the pulsation period；Gas in combustion chamber (22) is through igniter
After lighting, continuous pulsating flame is formed in combustion chamber (22), and then the high-temperature tail gas that (22) internal cause burning in combustion chamber generates is held
It is continuous to be sprayed in the form of wake flame exhaust nozzle (10), and then the wake flame that each exhaust nozzle (10) is sprayed is to heating equipment
It is heated；The utilization to gas is realized in turn；As CH in gas source4It, will under the action of gas pump when concentration is less than 4%
Gas continuously supply into gas isocon (12) by way of two low concentrations pulsation gas supply pipe (13) is in the pulsation period
Gas；And then so that the inside of isocon (12) is formed continuous pulsation air pressure, and then the gas in isocon (12) pass through it is several
Flame holder (9) sprays methane gas into combustion chamber (22) in the pulsation period；Due to passing through several flame holders (9) to combustion chamber
(22) CH in the methane gas sprayed in4Concentration less than 4%, can not be successfully in combustion chamber (22) light or cannot keep it is multiple
The continuity of pulsation period burning needs to carry out CH to combustion chamber (22)4Enriching；Pressurization pure methane supply pipe (21) will be pure at this time
Methane is pressed into pure methane pressure accumulating chamber (14), and is pressurized pure methane supply pipe (21) and is persistently maintained in pure methane pressure accumulating chamber (14)
Air pressure, then each electromagnetism push-rod electric machine (18) of synchronous averaging makes each piston valve core (16) in periodically doing flexible advancing movement,
And then make methane enriching channel (15) in periodically blocking and unimpeded, and then export the enriching in methane enriching channel (15)
(20) in the pure CH of injection periodically into combustion chamber (22)4, the frequency of the flexible advancing movement by controlling piston valve core (16)
Rate makes enriching outlet (20) pure CH of injection into combustion chamber (22)4Period and step and flame holder (9) sprayed to combustion chamber (22)
It penetrates the period of gas and acts in agreement；And then realize that having carried out combustion gas to each intermittent combustion period in combustion chamber (22) adds
It is dense, guarantee that combustion chamber (22) can continuous intermittent combustion；And then the high-temperature tail gas that (22) internal cause burning in combustion chamber generates persistently leads to
It crosses exhaust nozzle (10) to spray in the form of wake flame, and then the wake flame that each exhaust nozzle (10) is sprayed carries out heating equipment
Heating；The utilization to gas is realized in turn；The pure methane gas in pure methane pressure accumulating chamber (14) can pass through heat exchange at the same time
Wall body (03) absorbs the heat generated after burning in combustion chamber (22), and then makes enriching outlet (20) injection into combustion chamber (22)
Be the pure CH having been warmed up4, and then effectively improve the efficiency of combustion in combustion chamber (22).
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Effective date of registration: 20231212 Address after: 221116 No. 1 University Road, Xuzhou City, Jiangsu Province Patentee after: CHINA University OF MINING AND TECHNOLOGY Patentee after: Guizhou Pals Low Carbon Energy Technology Co.,Ltd. Address before: 221116 No. 1 Tongshan University Road, Xuzhou City, Jiangsu Province Patentee before: CHINA University OF MINING AND TECHNOLOGY |