CN105333422B - The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen - Google Patents
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen Download PDFInfo
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- CN105333422B CN105333422B CN201510820370.4A CN201510820370A CN105333422B CN 105333422 B CN105333422 B CN 105333422B CN 201510820370 A CN201510820370 A CN 201510820370A CN 105333422 B CN105333422 B CN 105333422B
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- spleen
- inert component
- water power
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- pulverized coal
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 210000000952 spleen Anatomy 0.000 title claims abstract description 44
- 239000003245 coal Substances 0.000 title claims abstract description 41
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 28
- 239000000567 combustion gas Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000000452 restraining effect Effects 0.000 claims abstract description 3
- 230000007480 spreading Effects 0.000 claims abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000002817 coal dust Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000010304 firing Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/10—Disposition of burners to obtain a flame ring
- F23C5/12—Disposition of burners to obtain a flame ring for pulverulent fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, is related to a kind of coal burner, the pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, which is characterized in that the burner, including level-one primary air piping（4）, two level primary air piping（10）, premixed combustion gas room（11）, be arranged on premixed combustion gas room（11）The inert component inlet tank at rear portion（6）It vents one's spleen inlet tube with water power（7）And secondary air channel（3）；Premixed combustion gas room（11）The inert component inlet tank at rear portion（6）It vents one's spleen inlet tube with water power（7）Gas pre-mixed device is collectively constituted, entire gas pre-mixed process uses the Laval nozzle pattern for first restraining and spreading afterwards；Burner is equipped with inert component（CO2 or N2）Air accumulator（9）And apparatus for electrolyzing（8）.The burner is to add inert component（CO2Or N2）Water power vent one's spleen and fired again for heat source, non-oil ignition can be realized, suitable for the pulverized-coal fired boiler for the different coal characteristics that burn.
Description
Technical field
The present invention relates to a kind of coal burners, are fired again for heat source more particularly to one kind with adding inert component water power and venting one's spleen
Pulverized coal staging combustion device.
Background technology
In the long-term operational process of station boiler, certainly exist there are two operating condition, be respectively ignition phase and
Underrun stage, the breeze gas flow temperature that the two stages enter burner hearth are relatively low, it is difficult to realize it is stable catch fire and burn,
In order to enable breeze airflow reaches stable burning, the fuel that can be readily burned by burning（Such as oil and gas）It is or additional
Heat source（Such as high temperature gas ions and hot wind ignition）It realizes.
Closely about ten years, due to oily coal price lattice than rise, the enthusiasm and urgency of coal fired power plant fuel-economizing also greatly improves,
The development of the technologies such as few (micro-) oil drop fire, oil-free plasma ignition has been promoted energetically, but there are some defects for these technologies.It is just few
For (micro-) oil drop fire, although reducing in the dosage of oil, the patent of invention such as Publication No. CN 101093077A is " a kind of
Eddy flow powdered coal burner lit up by tiny oil ", but compared with conventional fuel ignition, also need arrangement petrol station, necessarily spend a large amount of expenses
With for security maintenance and land used；And plasma igniting then be using DC current contact the starting the arc so that certain pressure it is clean
Net air high-intensity magnetic field control under obtain directed flow air plasma, formed localized hyperthermia, when coal dust by when rapid point
Burning coal powder sprays into burner hearth, such as the patent of invention " for the burner on plasma ignition device " of publication number CN 1230556A, but
Cathode operating condition is severe, and working life is short；For hot wind ignition, such as Publication No. publication number CN 1490562A " pulverized-coal fired boilers
High temperature air ignition method and its device ", generates there are high temperature air in method and the problem transported of air.
Since the above method is there are respective short slab, for breeze airflow catches fire, can key reach for fuel gas stream
To ignition temperature.It is well known that the speed of combustion of hydrogen is exceedingly fast, centralized release energy, the temperature of combustion product can be more than
2000℃.It therefore, can firing coal-dust airflow if the high temperature of combustion of hydrogen can be utilized.And it is current, electrolysis water hydrogen making
Technology relative maturity, therefore, many experts and scholar are proposed using hydrogen as the patent of heat source, such as publication number CN 101187473A
" hydrogen and oxygen mixed gas burner " and publication number CN 101532678A " coal burning boiler of power station Brown Gas (oxyhydrogen) point
Fiery system ", but Yi Shang patent, using hydrogen and the direct combustion system of oxygen, this is difficult to realize in real process, former
Because the detonation velocity of hydrogen is up to 200m/s, directly burning is then prone to explosion phenomenon, therefore, the present invention propose it is a kind of with
Add inert component（CO2Or N2）Water power vent one's spleen the burner fired again for heat source, to realize that coal dust stablized catches fire.
The content of the invention
It is classified and fires it is an object of the invention to provide a kind of coal dust fired again for heat source so that inert component water power is added to vent one's spleen
Burner, the burner is to add inert component（CO2Or N2）Water power vent one's spleen and fired again for heat source, can realize non-oil ignition, be suitable for
Burn the pulverized-coal fired boilers of different coal characteristics.
The purpose of the present invention is what is be achieved through the following technical solutions：
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, the burner, including level-one
Primary air piping, two level primary air piping, premixed combustion gas room, the inert component inlet tank for being arranged on premixed combustion gas room rear portion
It vents one's spleen inlet tube and secondary air channel with water power；The inert component inlet tank and water power at premixed combustion gas room rear portion are vented one's spleen entrance
Pipe collectively constitutes gas pre-mixed device, and entire gas pre-mixed process uses the Laval nozzle pattern for first restraining and spreading afterwards；Burning
Device is equipped with inert component（CO2 or N2）Air accumulator and apparatus for electrolyzing；First air divides level-one primary air piping and two level primary air piping
Two-stage enters, and is respectively provided in level-one precombustion chamber and secondary firing room；Inert component inlet tank and water power are vented one's spleen the stream of inlet tube
Amount is controlled by pressure.
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, the air hose are equipped with defeated
Send the pipeline of Secondary Air, the main pulverized coal flow of conveying two level a wind pipe, convey igniting pulverized coal flow level-one a wind pipe,
The inert component inlet tank and water power for conveying premixed gas are vented one's spleen inlet tube, and more than pipeline is all coaxial circulating line, in addition,
Also open up the pipeline for electric ignition.
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, the feeding secondary wind
Pipe end be connected by the two level primary air piping of Secondary Air whirlwind entrance and the main pulverized coal flow of conveying, convey main pulverized coal flow
Two level a wind pipe end sets level-one precombustion chamber, and level-one precombustion chamber is connected with conveying igniting with the pipe end of primary wind and powder
It connects, conveying igniting is also connected with the pipe end of primary wind and powder with premixed combustion gas room, and premixed combustion gas room rear portion is
Inert component inlet tank and water power are vented one's spleen inlet tube, and specific connection fastens connecting mode using screw, i.e., each pipeline is sequentially coaxially
Being nested by step formula, it is into a single integrated structure to be fixedly mounted.
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, the feeding secondary wind
Pipeline front end close through plate washer or using the closing of pyramidal structure front end, several be cut in uniformly be drilled in the inner ring of rear end
Multiple rows of Secondary Air whirlwind entrance of axis, the gross area of all Secondary Air whirlwind entrances are approximately equal to the pipeline of feeding secondary wind.
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen conveys level-one First air
Pipeline front end and the pipeline of two level Secondary Air equally closed through plate washer.
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, premixed combustion gas room
Rear portion vents one's spleen inlet tube by inert component inlet tank and water power and the pipeline that is connected collectively constitutes gas pre-mixed device, entirely
It is first to restrain the Laval nozzle pattern spread afterwards that the pre-compounding process of gas, which uses,.
The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, water power are vented one's spleen inlet tube
It is connected with apparatus for electrolyzing, apparatus for electrolyzing installs pressure gauge additional, and inert component inlet tank is connected with inert component air accumulator,
It is similary to install pressure gauge additional.
Advantages of the present invention is with effect：
1. the present invention solves the disadvantage that oil ignition device for security maintenance and takes up an area expensive；
2. the present invention solves the disadvantage that cathode working life is short on plasma ignition device；
3. the present invention solves the problems, such as that high-temperature air ignitor high temperature air generates and air transports；
4. the present invention solve water power vent one's spleen directly burning be easy to explosion the defects of.
Description of the drawings
Fig. 1 is provided by the invention to add inert component（CO2Or N2）Water power vent one's spleen fire again for heat source coal dust classification
The structure diagram of burner.
In figure：1st, secondary combustion chamber；2nd, Secondary Air whirlwind entrance；3rd, secondary air channel；4th, level-one primary air piping；5th, electric ignition
Pipeline；6th, inert component inlet tank；7th, water power is vented one's spleen inlet tube；8th, apparatus for electrolyzing；9th, inert component air accumulator；10th, two
Grade primary air piping；11st, premixed combustion gas room；12nd, level-one precombustion chamber.
Specific embodiment
The present invention is described in detail for illustrated embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, to add inert component（CO2 or N2）Water power vent one's spleen the pulverized coal staging combustion fired again for heat source
Device, it has feeding secondary air hose 3, the two level primary air piping 10 for conveying main pulverized coal flow, conveys the level-one of igniting pulverized coal flow once
Wind pipeline 4, the inert component inlet tank 6 for conveying premixed gas and water power are vented one's spleen inlet tube 7, and more than pipeline is all coaxial annular
Pipeline, in addition, also opening up the pipeline 5 for electric ignition.
3 end of feeding secondary air hose passes through Secondary Air whirlwind entrance 2 and 10 phase of two level primary air piping for conveying main pulverized coal flow
Connection, 10 end of two level primary air piping for conveying main pulverized coal flow set level-one precombustion chamber 12, and level-one precombustion chamber 12 is lighted a fire with conveying
It is connected with 4 end of level-one primary air piping, 4 end of conveying igniting level-one primary air piping is also connected with premixed combustion gas room 11
It connects, 11 rear portion of premixed combustion gas room is vented one's spleen inlet tube 7 for inert component inlet tank 6 and water power, and spiral shell may be employed in specific connection
Clench solid connecting mode, i.e., each pipeline sequentially coaxially by step formula be nested be fixedly mounted it is into a single integrated structure.
(or using the closing of pyramidal structure front end) is closed in 3 front end of feeding secondary air hose through plate washer, in the inner ring of rear end
Uniformly it is drilled with several multiple rows of Secondary Air whirlwind entrances 2 for being cut in axis, the gross areas of all Secondary Air whirlwind entrances is approximately equal to defeated
The pipeline of Secondary Air is sent, in favor of reducing the flow resistance of gas.
It conveys 4 front end of pipeline of level-one First air and the air hose 10 of two level Secondary Air is equally closed through plate washer.
11 rear portion of premixed combustion gas room, by inert component inlet tank 6 and water power vent one's spleen inlet tube 7 and the pipe that is connected
Road collectively constitutes gas pre-mixed device, and it is first to restrain the Laval nozzle pattern spread afterwards that the pre-compounding process of entire gas, which uses,.
Water power inlet tube 7 of venting one's spleen is connected with apparatus for electrolyzing 8, and apparatus for electrolyzing installs pressure gauge, inert component entrance additional
Case 6 is connected with inert component air accumulator 9, equally installs pressure gauge additional.
The present invention operation principle and process be：
During present invention work, water power is vented one's spleen and inert component gas（CO2 or N2）Respectively by apparatus for electrolyzing 8 and inertia group
Dividing air accumulator 9, water electrolysis gas injection inert media mixes in the straight tube being connected into burner（Reduce premixed gas
Flame propagation velocity）, straight pipe is connected with premixed combustion gas room 11, and the diverging expansion of premixed combustion gas room 11 is in back taper
Shape, premixed gas are lighted by the electric ignition device that the pipeline 5 of electric ignition introduces, the back taper flame ignition after lighting by
The breeze airflow that level-one primary air piping 4 inputs, breeze airflow burning in level-one precombustion chamber 12,12 inner wall of level-one precombustion chamber are guarantor
Adiabator, so as to ensure that level-one First air breeze airflow stablized catches fire and with higher temperature, level-one precombustion chamber 12 exports
Flame, with inputting main breeze airflow mixed combustion by two level primary air piping 10, the mixed combustion later stage again with it is defeated by secondary air channel 3
The hot-air entered carries out completely burned in secondary firing room.
The flame stabilization mechanism of burner of the present invention is to vent one's spleen to fire generation height again using the water power for adding inert media
Warm flue gas, the main component in flue gas are H2O and CO2, simultaneously H, OH free radical and CO containing part, and premixed gas is pre-
Mixed gas combustion chamber 11 burns, and forms a Liang Gaoyidi torches area, i.e. high temperature, high speed, low pressure flare area, center low-pressure area pair
All flow fields are particularly generates Involving velocity to the igniting coal dust of level-one primary wind and powder, creates good ignition condition.Burner
The aerodynamic arrangement of design is using three layers of staged speed flowing field, wherein two layers is main flow field, completes two-stage igniting, one layer is
Flow field is controlled, the patch wall friction of mainstream field expansion is controlled by force and stablizes in underload and burn.
Claims (3)
1. the pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen, which is characterized in that the burner,
Including level-one primary air piping（4）, two level primary air piping（10）, premixed combustion gas room（11）, be arranged on premixed combustion gas room
（11）The inert component inlet tank at gas access end（6）It vents one's spleen inlet tube with water power（7）And secondary air channel（3）；Inert component enters
Mouth case（6）Straight pipe and premixed combustion gas room（11）It is connected, premixed combustion gas room（11）The inertia at gas access end
Component inlet tank（6）It vents one's spleen inlet tube with water power（7）Collectively constitute gas pre-mixed device, water power is vented one's spleen inlet tube（7）It is inserted into lazy
Property component inlet tank（6）Interior, entire gas pre-mixed process uses the Laval nozzle pattern for first restraining and spreading afterwards；Burner is equipped with
Inert component air accumulator（9）And apparatus for electrolyzing（8）, water power vents one's spleen inlet tube（7）With apparatus for electrolyzing（8）It is connected, water power
It solves device and installs pressure gauge, inert component inlet tank additional（6）With inert component air accumulator（9）It is connected, inert component inlet tank（6）
Install pressure gauge additional；Inert component inlet tank（6）It vents one's spleen inlet tube with water power（7）Flow controlled by pressure；The Secondary Air
Pipe（3）, the main pulverized coal flow of conveying two level primary air piping（10）, conveying igniting pulverized coal flow level-one primary air piping（4）, conveying it is pre-
The inert component inlet tank of mixed gas（6）It vents one's spleen inlet tube with water power（7）It is all coaxial circulating line, in addition, being additionally provided with use
In the pipeline of electric ignition（5）；The secondary air channel（3）End passes through Secondary Air whirlwind entrance afterwards（2）With conveying main pulverized coal flow
Two level primary air piping（10）It is connected, conveys the two level primary air piping of main pulverized coal flow（10）End sets level-one precombustion chamber afterwards
（12）, level-one precombustion chamber（12）Level-one primary air piping with conveying igniting pulverized coal flow（4）End is connected afterwards, and conveying igniting is used
Level-one primary air piping（4）Afterwards end also with premixed combustion gas room（11）It is connected, secondary air channel（3）, two level primary air piping
（10）, level-one primary air piping（4）It is sequentially coaxially nested from outside to inside by step formula and into a single integrated structure, premixed gas combustion is fixedly mounted
Burn room（11）It is arranged on level-one primary air piping（4）It is interior.
2. the pulverized coal staging combustion device according to claim 1 fired again for heat source so that inert component water power is added to vent one's spleen,
It is characterized in that, the secondary air channel（3）Front end is closed through baffle, in secondary air channel（3）Rear end inner ring on be uniformly drilled with
Multiple rows of Secondary Air whirlwind entrance（2）.
3. the pulverized coal staging combustion device according to claim 1 fired again for heat source so that inert component water power is added to vent one's spleen,
It is characterized in that, level-one primary air piping（4）Front end and the air hose of two level First air（10）It is closed through baffle front end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510820370.4A CN105333422B (en) | 2015-11-24 | 2015-11-24 | The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510820370.4A CN105333422B (en) | 2015-11-24 | 2015-11-24 | The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105333422A CN105333422A (en) | 2016-02-17 |
| CN105333422B true CN105333422B (en) | 2018-06-01 |
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| CN201510820370.4A Active CN105333422B (en) | 2015-11-24 | 2015-11-24 | The pulverized coal staging combustion device fired again for heat source so that inert component water power is added to vent one's spleen |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464932A (en) * | 2021-08-12 | 2021-10-01 | 西安热工研究院有限公司 | Pulverized coal fired boiler combustion system equipped with hydrogen on-duty flame for stable combustion |
| CN113958950B (en) * | 2021-11-15 | 2023-10-13 | 上海电力大学 | Device for coal-fired power plant coal-hydrogen-oxygen synergistic strengthening stable combustion |
| CN117165343A (en) * | 2023-03-13 | 2023-12-05 | 江苏与奏实业有限公司 | Fuel mixed by water electrolysis gas and catalyst and turbine prime motor power generation system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2487965Y (en) * | 2001-01-15 | 2002-04-24 | 烟台开发区龙源电力燃烧控制工程有限公司 | Multifunctional pulverized coal burner using multi-stage axial feeding powder and gas film cooling technique |
| JP2008128612A (en) * | 2006-11-24 | 2008-06-05 | 炳霖 ▲楊▼ | Hydrogen/oxygen mixed gas fuel burner |
| CN201043758Y (en) * | 2006-12-28 | 2008-04-02 | 赵成刚 | Ignition device for igniting pulverized coal by oxyhydrogen flame |
| JP2009174043A (en) * | 2007-12-27 | 2009-08-06 | Toshigoro Sato | Apparatus for generating water electrolytic gas |
| CN101532678B (en) * | 2009-03-02 | 2014-05-07 | 章礼道 | Brown gas (oxyhydrogen gas) ignition system of coal burning boiler of power plant |
| CN101881441B (en) * | 2010-06-18 | 2013-03-27 | 王兴道 | Gasification combustion hydrolyzing auxiliary combustion device and method of pulverized coal |
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2015
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Inventor after: Xiao Fang Inventor before: Feng Zhaoxing Inventor before: Li Hongtao |
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Effective date of registration: 20180427 Address after: 061001 Hebei province Cangzhou canal area Jiefang Road south new village family courtyard 13 Building 6 unit 101 room. Applicant after: Xiao Fang Address before: 110034 No. 185 the Yellow River North Street, Huanggu District, Shenyang, Liaoning. Applicant before: SHENYANG ANRUIJIE ENERGY EQUIPMENT TECHNOLOGY CO., LTD. |
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Effective date of registration: 20181011 Address after: 061000 Cangxian Zhifang tou Industrial Park, Cangzhou, Hebei Patentee after: CANGZHOU TIANLONG COMBUSTION EQUIPMENT CO., LTD. Address before: 061001 Hebei province Cangzhou canal area Jiefang Road south new village family courtyard 13 Building 6 unit 101 room. Patentee before: Xiao Fang |