CN114151804B - Tail gas treatment combustor of power generation system - Google Patents
Tail gas treatment combustor of power generation system Download PDFInfo
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- CN114151804B CN114151804B CN202010934409.6A CN202010934409A CN114151804B CN 114151804 B CN114151804 B CN 114151804B CN 202010934409 A CN202010934409 A CN 202010934409A CN 114151804 B CN114151804 B CN 114151804B
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- 238000010248 power generation Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 125
- 238000002485 combustion reaction Methods 0.000 claims abstract description 69
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000001301 oxygen Substances 0.000 claims abstract description 39
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000446 fuel Substances 0.000 claims abstract description 16
- 238000009826 distribution Methods 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 18
- 230000001154 acute effect Effects 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 17
- 239000003546 flue gas Substances 0.000 abstract description 17
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 7
- 239000000779 smoke Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- IYSGJCJSRBFZSZ-UHFFFAOYSA-N carbon monoxide;manganese;5-methylcyclopenta-1,3-diene Chemical compound [Mn].[O+]#[C-].[O+]#[C-].[O+]#[C-].C[C-]1C=CC=C1 IYSGJCJSRBFZSZ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000003090 exacerbative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- 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
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of 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
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- 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
- Y02E20/32—Direct CO2 mitigation
-
- 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
Abstract
The invention discloses a tail gas treatment burner of a power generation system, which comprises a flame tube (100); an anode air inlet pipe (200) which is used as a heat exchanger and extends into the flame tube (100); and the combustion assembly (300) comprises a combustion seat (301) positioned at the bottom of the cylinder cavity of the flame cylinder (100), and an oxygen inlet pipe (302) and an anode tail gas inlet pipe (303) which are connected with the combustion seat (301). The invention adopts the assembly form of a flame tube, an anode air inlet pipe and a combustion assembly, wherein the oxygen air inlet pipe is a combustion improver pure oxygen inlet pipe, the anode tail gas air inlet pipe is a fuel pipe, and the pure oxygen is combusted in a cyclone mixing way through a combustion seat, so that the introduction of impurities is avoided, and the enrichment of CO2 tail gas is improved. The generated flue gas and the anode air inlet pipe perform simple heat exchange, so that the pressure fluctuation of the system is avoided, and the heat utilization rate is improved.
Description
Technical Field
The invention belongs to the field of tail gas treatment combustors.
Background
For a gas-fired power generation SOFC system, unreacted combustible gas and contaminant gas, such as CH, are present in the anode tail gas 4 CO, and the like. In the system circulation PID, in the running state, a tail gas burner is adopted, the combustible gas in the tail gas is burnt by using excessive air, the emission of pollutants is ensured to reach the standard, and the main component of the tail gas after the combustion is H 2 O and CO 2 . The heat generated by the burner is used for heating cathode air inlet (such as air) by using a radiation heat exchanger, a plate heat exchanger and other devices, or is provided for a reformer, and waste heat is utilized to improve the heat efficiency of the system.
However, the tail gas emission of the existing system contains a large amount of CO 2 Exacerbating the atmospheric chamber effect, and introducing N by using air as combustion improver 2 Impurity, influence CO 2 Enrichment efficiency, NO in tail gas treatment process x The discharge is larger, which may cause acid corrosion of the tail pipeline of the system and affect the safety.
In addition, for the synthetic gas IGFC system, the heat value of the synthetic gas is lower, the flow difference between the cathode and the anode is larger, the effect of heating the cathode by waste heat is not obvious enough, and flue gas is directly injected into the tail part of the cathode exhaust, so that the back pressure fluctuation of the system is easy to cause.
Disclosure of Invention
In order to overcome the defects or shortcomings in the prior art, the invention provides a tail gas treatment burner of a power generation system, which can realize CO 2 Enriching and improving the heat utilization rate.
To achieve the above object, the present invention provides an exhaust gas treatment burner of a power generation system, the exhaust gas treatment burner comprising:
a flame tube; an anode air inlet pipe which is used as a heat exchanger and extends into the flame tube; and
the combustion assembly comprises a combustion seat positioned at the bottom of the cylinder cavity of the flame cylinder, and an oxygen inlet pipe and an anode tail gas inlet pipe which are connected with the combustion seat.
In some embodiments, the oxygen inlet pipe is connected with a pure oxygen supply pipe or an oxygen generator.
In some embodiments, the anode inlet pipe includes:
an axially extending segment extending downwardly into the flame tube;
an axial extension section extending upwards out of the flame tube; and
and the snake-shaped disc tube section is connected between the axial extending section and spirals along the peripheral surface in the tube cavity of the flame tube.
In some embodiments, the serpentine circumferential surface of the serpentine coil section is radially spaced parallel to the inner wall surface of the flame tube.
In some embodiments, the serpentine coil segment comprises:
a plurality of straight coils extending in an axial direction and being spaced apart from each other in a circumferential direction in parallel; and
and the arc-shaped coil pipes are connected between the pipe ends of the adjacent straight pipe sections.
In some embodiments, the combustion assembly is configured such that combustion fumes spiral up within the barrel cavity of the flame barrel.
In some embodiments, the combustion assembly comprises:
the oxygen air distribution plate is provided with a central mounting hole and a plurality of air distribution holes, and the air distribution holes are sequentially distributed at intervals along the circumferential direction and form a ring shape surrounding the central mounting hole;
the combustion seat is embedded in the central mounting hole and comprises a plurality of gas holes, and the gas holes are sequentially distributed in a hole ring shape at intervals along the circumferential direction; and
the flame stabilizing expander is in an upward flaring cone shape and is arranged on the oxygen air distribution plate around the air distribution holes;
the oxygen flow passing through the air distribution holes and the gas flow passing through the gas holes generate mixed combustion in the flame stabilizing expander.
In some embodiments, the air distribution holes and the gas holes are swirl holes with hole axes inclined towards the same circumferential direction to form a homodromous swirl, and the hole axes of the swirl holes extend upwards and outwards in an inclined manner towards the inner wall surface of the flame stabilizing expander.
In some embodiments, the acute included angle between the hole axis of the air distribution hole and the horizontal plane is not equal to the acute included angle between the hole axis of the fuel air hole and the horizontal plane.
In some embodiments, the radial outer end of the flame tube is sleeved with a forced cooling shell, the forced cooling shell is used for cooling the wall of the flame tube, and an ignition hole extending out of the forced cooling shell is formed at the radial outer end of the flame tube and near the combustion seat.
In the tail gas treatment burner, the flame tube, the anode gas inlet tube and the combustion assembly are adopted, the oxygen gas inlet tube is a combustion improver pure oxygen inlet tube, the anode tail gas inlet tube is a fuel tube, and the pure oxygen is used for combustion by cyclone mixing of a combustion seat, so that the introduction of impurities is avoided, and the CO is promoted 2 Enriching. The generated flue gas and the anode air inlet pipe perform simple heat exchange, so that the pressure fluctuation of the system is avoided, and the heat utilization rate is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a perspective view of an exhaust gas treatment combustor according to an embodiment of the present invention;
FIG. 2 is an exploded view of FIG. 1, showing an anode inlet tube and combustion assembly within a flame tube, etc.;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is an overall cross-sectional view of FIG. 3, illustrating the internal structure of the exhaust gas treatment combustor;
FIGS. 5 and 6 are top views of the exhaust gas treatment burner of FIG. 3, respectively, wherein parts of the components are omitted for clarity of illustration, FIG. 5 specifically illustrates the flame tube and the internal anode inlet pipe, oxygen grid, fuel swirl nozzle and flame stabilizing expander, etc., and FIG. 6 further illustrates only the oxygen grid, fuel swirl nozzle and flame stabilizing expander;
FIG. 7 is a cross-sectional view taken along section A-A of FIG. 6;
FIG. 8 is a perspective view of the anode inlet tube of FIG. 1 at different viewing angles;
FIG. 9 is a perspective view of the fuel swozzle shown in FIG. 1 at a different viewing angle;
FIG. 10 is a perspective view of the gas hole of FIG. 9 from a top view; and
fig. 11 is a schematic diagram of the operation of the exhaust gas treatment burner of fig. 1.
Reference numerals illustrate:
100. anode air inlet pipe of flame tube 200
201. Axial extension 202 axial extension
203. Straight coil of serpentine coil section 2031
2032. Arc-shaped coil 300 combustion assembly
301. Oxygen air distribution plate of combustion base 3011
3012. Flame stabilizing expander for fuel swirl nozzle 3013
302. Anode tail gas inlet pipe of oxygen inlet pipe 303
1. Air distribution hole 2 gas holes
3. Ignition hole of forced cooling shell 4
Oxygen inlet A and anode tail gas inlet B
C1 Cooling air inlet C2 cooling air outlet
Hole axis of OO' gas hole
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with exemplary embodiments.
The present invention provides an exhaust gas treatment burner of a power generation system, referring to the embodiment of fig. 1 to 11, the exhaust gas treatment burner includes:
an outer flame tube 100;
an anode intake pipe 200 at the upper part of the inner cavity of the flame tube 100, see fig. 4 and 5, wherein the anode intake pipe 200 extends into the flame tube 100 as a heat exchanger; and
the lower combustion assembly 300 comprises a combustion seat 301 at the bottom of the barrel cavity of the flame barrel 100, and an oxygen inlet pipe 302 and an anode tail gas inlet pipe 303 which are connected with the combustion seat 301, see fig. 4 and 6.
The invention aims to provide a tail gas treatment burner for anode tail gas of an SOFC system so as to solve the problem of CO of the anode tail gas 2 Enrichment and heat utilization rate improvement. Due to the presence of unreacted combustible and contaminant gases, such as CH, in the anode tail gas in a gas-fired SOFC system 4 CO and the like, the tail gas of the anode is required to be further treated by a tail gas treatment burner, and heat energy is released and CO is generated in the combustion process 2 And the combustion products are required to fully consider the problems of energy utilization and tail gas emission reduction in the tail gas treatment process, improve the heat energy utilization rate and treat CO 2 And (3) performing solidification enrichment to form an environment-friendly production process with high utilization rate, energy enrichment and low tail gas emission as much as possible.
In this embodiment, a CO is proposed for a power generation SOFC system 2 The structural design form of the trapped tail gas treatment burner. The oxygen inlet pipe 302 and the anode tail gas inlet pipe 303 at the lower part of the flame tube 100 are respectively a pure oxygen inlet pipe and an anode tail gas inlet pipe, and are combined with the combustion seat 201 at the bottom of the tube cavity of the flame tube 100 to form the combustion assembly 300, further, the anode inlet pipe 200 is used as a heat exchanger and extends into the combustion flue gas outlet of the flame tube 100 in a coil shape, and in the embodiment, a serpentine disc shape is used, but not limited thereto, as shown in fig. 4 and 11.
As shown in the figure, pure oxygen of combustion-supporting gas enters the oxygen inlet pipe 302 along the oxygen inlet a, anode tail gas of fuel gas enters the anode tail gas inlet pipe 303 along the anode tail gas inlet B, and the fuel gas and the combustion-supporting gas are swirled and mixed at the combustion seat 301 for combustion, wherein the combustion-supporting gas is pure oxygen, and the introduction of N is avoided 2 And other impurities, in order to realize the CO of the combustion flue gas 2 Trapping provides a prerequisite; further, the high-temperature flue gas cyclone generated by combustion is lifted to the upper part of the flame tube 100, the combustion flue gas is positioned in the flame tube 100, the anode inlet gas is positioned in the anode inlet pipe 200, and the two are subjected to pure heat exchange, but not material exchange type heat exchange, so that no new gas component is introduced into the combustion flue gas, and CO in the combustion tail gas is ensured 2 Concentration of CO for further realizing combustion of flue gas 2 Trapping provides advantages.
In this embodiment, the oxygen inlet pipe 302 is connected to a pure oxygen supply pipe or an oxygen generator. The pure oxygen supply pipe or the oxygenerator is used for supplying or producing pure oxygen, the pure oxygen is used as a combustion improver while the gas is supplied into the oxygen inlet pipe 302, and oxygen is only introduced into the tail gas treatment burner, and is used as one of the necessary elements for forming the gas by the anode tail gas, so that the pure oxygen supply pipe or the oxygenerator is highly compatible with the production concept of not introducing new impurities in the industrial production process, and the gas supply end of the oxygen inlet pipe 302 is not limited to the pure oxygen supply pipe or the oxygenerator, so long as the pure oxygen can be supplied into the oxygen inlet pipe 302.
Meanwhile, as shown in fig. 4 and 8, the anode intake pipe 200 includes: an axially extending segment 201 extending downwardly into the flame tube 100; an axially extending segment 202 extending upwardly out of the flame tube 100; and a serpentine coil segment 203 connected between the axially extending segment 201 and the axially extending segment 202 and spiraling circumferentially within the barrel cavity of the flame tube 100. The anode air inlet pipe 200 is composed of three parts, wherein the axially extending section 201 is an input end of anode air inlet, the axially extending end 202 is an output end of anode air inlet, the anode air inlet flows in the serpentine pipe section 203 in a homeotropic manner, so that the anode air inlet flows along the axial direction of the flame tube 100 and is close to the circumferential surface of the wall of the flame tube 100, the pure heat exchange between the flowing anode air inlet and swirl spiral-flow combustion gas is realized, namely, the heat loss caused by direct cooling of smoke is reduced, the heat exchange efficiency is improved, the material exchange of the flowing anode air inlet and the swirl spiral-flow combustion gas is prevented, the pressure fluctuation of the system is avoided, meanwhile, the serpentine pipe section 203 is close to the wall of the flame tube, the temperature of the wall of the flame tube is controlled, the heat loss caused by direct cooling of the wall of the flame tube is reduced, meanwhile, the wall is prevented from being directly washed by high-temperature smoke, the wall is protected, and the service life of the flame tube is prolonged.
More specifically, as an example, the spiral circumferential surface of the serpentine coil segment 203 is radially spaced parallel to the inner wall surface of the flame tube 100, as shown in fig. 5. The anode inlet air uniformly flows through the wall of the flame tube 100, and the temperature of the wall of the flame tube 100 is uniformly controlled. Wherein the serpentine coil segment 203 comprises: a plurality of straight coils 2031 extending axially and circumferentially spaced apart and parallel to each other; and arcuate coils 2032 connected between the ends of adjacent straight coils 2031 as shown in fig. 8. Wherein, straight coil 2031 guarantees that the anode inlet flows along the axial direction of flame tube 100, and arc coil 2032 reduces the anode inlet flow resistance and impact on the coil, realizing the smooth flow of the anode inlet.
As shown in fig. 4, 6 and 7, the combustion assembly 300 is configured such that the combustion flue gas is spirally lifted in the cylinder cavity of the flame tube 100, wherein the spiral lifting of the combustion flue gas along the cylinder cavity is perpendicular to the flowing direction of the anode inlet gas in the anode inlet pipe 200, so as to ensure that the high-temperature flue gas vertically sweeps across the heat exchange surface in a multiple rotational flow manner, and the heat convection and radiant heat are fully utilized to heat the anode inlet gas, so as to improve the heat efficiency of the system.
The tail gas treatment burner of the existing power generation SOFC system mostly adopts air as combustion improver, and utilizes excessive air and combustible gas in anode tail gas to burn, so as to ensure CO and NO x The emission of the pollutant reaches the standard, and the main component of the tail gas after combustion is H 2 O and CO 2 The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, heat generated by the burner is mixed with cathode gas by using devices such as a radiation heat exchanger, a plate heat exchanger and the like, and the cathode gas is heated by the heat exchanger to be supplied to the reformer, so that the waste heat is utilized, and the heat efficiency of the system is improved.
Wherein, air is used as tail gas combustion improver, and a large amount of N is introduced 2 Resulting in NO x Pollutant emission, pollution to atmosphere and CO influence 2 Even can cause acid etching of a tail system to influence safety; meanwhile, for a synthetic gas IGFC system, the heat value of the synthetic gas is low, the flow difference between a cathode and an anode is large, the flow of the cathode is 10-15 times that of the anode under a typical working condition, the effect of heating the cathode by waste heat is not obvious enough, and flue gas is directly injected into the tail part of cathode exhaust, so that the back pressure fluctuation of the system is easy to cause.
Specifically, in the present embodiment, as shown in fig. 6 and 7, the combustion seat 301 includes: the oxygen air distribution plate 3011 is provided with a central mounting hole and a plurality of air distribution holes 1, and the air distribution holes 1 are sequentially distributed at intervals along the circumferential direction and form a ring shape surrounding the central mounting hole. Pure oxygen introduced into the oxygen inlet pipe 302 enters the flame tube 100 through the plurality of air distribution holes 1, and when the pure oxygen burns nearby the equivalent according to the use requirement, the pure oxygen flow is smaller, and the flow speed of the oxygen air flow is ensured through the air distribution holes 1, so that the flame swirl intensity is enhanced, the blending effect is ensured, and in addition, when the low-temperature oxygen flows through and cools the oxygen air distribution plate 3011 and the flame stabilizing expander 3013, the weld joint temperature is ensured to be within an acceptable range. The fuel swirl nozzle 3012 located at the center of the bottom of the flame tube 100 is embedded in the central mounting hole and comprises a plurality of gas holes 2, and the plurality of gas holes 2 are sequentially distributed in a hole ring shape at intervals along the circumferential direction, as shown in fig. 7, 9 and 10. Wherein the top circular plane of the fuel swirl nozzle 3012 forms a blunt body structure and the inside is a conical surface structure, but is not limited thereto, and the fuel gas holes 2 shown in fig. 7 at section A-A are only partial structures of the holes.
The fuel swirl nozzle 3012 and the anode tail gas inlet pipe 303 can be connected through threads on the inner side of the fuel swirl nozzle 3012, but the method is not limited to the method, and the anode tail gas inlet pipe 303 is filled with anode tail gas and enters the flame tube 100 along a plurality of gas holes 2 to be mixed with pure oxygen of the combustion improver; the flame stabilizing expander 3013 at the outer edge is cone-shaped with an upward flaring and is arranged on the oxygen air distribution plate 3011 around the air distribution holes 1; the flame stabilizing expander 3013 is concentric with the oxygen air distribution plate 3011 and the fuel swirl nozzle 3012, wherein the oxygen air flow passing through the air distribution holes 1 and the gas air flow passing through the gas holes 2 generate mixed combustion in the flame stabilizing expander 3013, the mixed air flow collides with the inner wall surface of the flame stabilizing expander 3013 when flowing, a low-pressure area is formed in the middle of the burner due to the fact that the flowing direction of the mixed air flow forms a certain angle with the vertical direction and the action of a nozzle blunt body structure, the mixed air flow flows towards the entrainment backflow direction, the entrainment backflow strength of smoke is enhanced, the stability and the blending effect of the flame root are enhanced, the flame stabilizing and swirling mechanism adopted in the flame tube 100 improves the stability of anode tail gas (low heat value and large moisture content) combustion, and the flame length is controlled.
As shown in fig. 7 and 10, the air distribution holes 1 and the gas holes 2 are swirl holes with hole axes inclined toward the same circumferential direction to form a co-rotating swirl, and the hole axes of the swirl holes extend obliquely upward and outward toward the inner wall surface of the flame stabilizing expander 3013 as shown by the gas hole 2 hole axis OO' in fig. 7. The axes of the air distribution holes 1 and the gas holes 2 form a certain rotational flow angle with the horizontal plane, oxygen and gas are rotated anticlockwise in the same direction, and further, the acute included angle between the axes of the air distribution holes 1 and the horizontal plane is not equal to the acute included angle between the axes of the gas holes 2 and the horizontal plane. The rotational flow arrangement mode ensures that anode tail gas and pure oxygen are converged in the flame stabilizing expander 3013, combustion air flow can be decomposed into two directions, wherein one direction is a backflow direction, namely, reflection backflow of the air flow at the central position of a combustion area, the other direction is a rotational flow direction, the combustion air flow forms stronger counterclockwise rotational flow, the spiral rising of smoke is perpendicular to the air inlet flow direction of the anode, the high-temperature smoke is ensured to vertically scan the heat exchange surface for multiple rotational flows, and heat convection and radiant heat are fully utilized to heat internal anode air inlet so as to improve the thermal efficiency of the system. Meanwhile, a low-pressure backflow area is formed in the center of the flame, high-temperature smoke is sucked to the root of the flame, smoke backflow is achieved, the mixing effect of fuel and oxygen is improved, meanwhile, the temperature of the root of the flame is improved, a strong flame stabilizing effect is formed, and stable combustion of ultralow-heat-value anode tail gas is ensured.
As shown in fig. 2 and fig. 4, the radial outer end of the flame tube 100 is sleeved with a forced cooling shell 3, the forced cooling shell 3 is used for cooling the wall of the flame tube 100, cooling air enters the forced cooling shell 3 along a cooling air inlet C1 and is discharged along a cooling air outlet C2, the cooling air flows downwards and upwards, the cooling effect is improved, the wall of the flame tube 100 is effectively protected, the service life is prolonged, an ignition hole 4 extending out of the forced cooling shell 3 is formed at the radial outer end of the flame tube 100 and close to a combustion seat 301, and the gas and the combustion supporting gas in the flame tube 100 are ignited and combusted through the ignition hole 4.
The system tail gas components in the power generation SOFC system of the invention can change along with the output load, fuel utilization rate and fuel components of the power generation module. Further, CFD simulation calculation of tail gas combustion processes of the 10 kW-level and 5 kW-level systems is performed aiming at the variable load characteristic of the output power of the system.
In the four embodiments shown in the following tables one to four, the experiment is performed by using the synthesis gas with different components as fuel gas and introducing the synthesis gas into the power generation system with different output loads, and the experimental results are shown in the following tables, wherein the flow units are SLPM. The tail gas components are simulated by mixing the gas cylinder and the gas, and then the mixed gas is introduced into a water bath device, and the water content in the mixed gas is controlled by the water bath temperature, so that the tail gas simulation of different components is completed.
Results tableBright: the tail gas treatment burner for the anode tail gas of the SOFC system provided by the invention can normally work under different output power load conditions, and the treated flue gas dries the base CO 2 The concentration is higher than 95 percent, and remarkably improves CO 2 Enrichment rate.
In summary, in the tail gas treatment burner of the present invention, pure oxygen is used as combustion improver and is introduced into the oxygen inlet pipe 302, so as to avoid introducing N 2 And the like, and reduce NO x Emission of CO for realizing combustion of flue gas 2 The trapping provides precondition, further, the anode air inlet pipe 200 is adopted to enable the anode air inlet to flow along the axial direction of the flame tube 100 and approach the circumferential surface of the wall of the flame tube 100, the wall is protected, the service life is prolonged, the anode air inlet and the combustion tail gas perform pure heat exchange instead of substance exchange type heat exchange, the pressure fluctuation of the system is avoided, the heat utilization rate is effectively improved, meanwhile, new gas components are not introduced into the combustion flue gas, and the CO in the combustion tail gas is ensured 2 Concentration of CO for further realizing combustion of flue gas 2 Trapping provides an advantageous guarantee.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present invention within the scope of the technical concept of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (4)
1. An exhaust gas treatment combustor of a power generation system for an SOFC power generation system, the exhaust gas treatment combustor comprising:
a flame tube (100); an anode air inlet pipe (200) which is used as a heat exchanger and extends into the flame tube (100); and
the combustion assembly (300) comprises a combustion seat (301) positioned at the bottom of a cylinder cavity of the flame cylinder (100), and an oxygen inlet pipe (302) and an anode tail gas inlet pipe (303) which are connected with the combustion seat (301);
wherein the anode intake pipe (200) includes:
an axial extension (201) extending downwardly into the flame tube (100);
an axially extending segment (202) extending upwardly out of the flame tube (100); and
a serpentine coil section (203) connected between the axially extending section (201) and the axially extending section (202) and spiraling circumferentially within the barrel cavity of the flame barrel (100); the serpentine coil section (203) comprises:
a plurality of straight coils (2031) extending axially and circumferentially spaced apart from each other in parallel; and
an arcuate coil (2032) connected between the ends of adjacent straight coils (2031);
wherein the combustion seat (301) comprises:
the oxygen air distribution plate (3011) is provided with a central mounting hole and a plurality of air distribution holes (1), and the air distribution holes (1) are sequentially distributed at intervals along the circumferential direction and form a ring shape surrounding the central mounting hole;
the fuel swirl nozzle (3012) is embedded in the central mounting hole and comprises a plurality of gas holes (2), and the plurality of gas holes (2) are sequentially distributed at intervals along the circumferential direction to form a hole ring shape; and
a flame stabilizing expander (3013) which is in a cone shape flaring upwards and is arranged on the oxygen air distribution plate (3011) around the air distribution holes (1);
wherein, the oxygen flow passing through the air distribution holes (1) and the gas flow passing through the gas holes (2) generate mixed combustion in the flame stabilizing expander (3013); the air distribution holes (1) and the gas holes (2) are swirl holes with hole axes inclined towards the same circumferential direction to form homodromous swirl, and the hole axes of the swirl holes extend upwards and outwards in an inclined mode towards the inner wall surface of the flame stabilizing expander (3013).
2. The exhaust gas treatment burner according to claim 1, characterized in that the oxygen inlet pipe (302) is connected to a pure oxygen supply pipe or an oxygenerator.
3. The exhaust gas treatment burner according to claim 1, characterized in that the acute included angle between the hole axis of the air distribution hole (1) and the horizontal plane is not equal to the acute included angle between the hole axis of the gas hole (2) and the horizontal plane.
4. The tail gas treatment burner of claim 1, wherein the radially outer end of the flame tube (100) is sleeved with a forced cooling shell (3), the forced cooling shell (3) is used for cooling the wall of the flame tube (100), and an ignition hole (4) extending out of the forced cooling shell (3) is arranged at the radially outer end of the flame tube (100) and near the combustion seat (301).
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