CN103423739A - Abrasion proof slag-leakage resistant wind cap with combined core tube - Google Patents
Abrasion proof slag-leakage resistant wind cap with combined core tube Download PDFInfo
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- CN103423739A CN103423739A CN2013103261422A CN201310326142A CN103423739A CN 103423739 A CN103423739 A CN 103423739A CN 2013103261422 A CN2013103261422 A CN 2013103261422A CN 201310326142 A CN201310326142 A CN 201310326142A CN 103423739 A CN103423739 A CN 103423739A
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Abstract
An abrasion proof slag-leakage resistant wind cap with a combined core tube comprises a wind cap outer cover with a top hole in the top and a bottom hole in the bottom and a combined core tube penetrating through the wind cap outer cover and combined with the wind cap outer cover, wherein the combined core tube is formed by sequentially connecting a heterotypic plug, a flow guide core tube and a fixing core tube; the combined core tube passes through the heterotypic plug, penetrates through the top hole of the wind cap outer cover and is fixed with the wind cap outer cover; a flowing gap is reserved between the outer wall of the combined core tube and the inner wall of the wind cap outer cover; the combined core tube tightly penetrates through the bottom hole of the wind cap outer cover, passes through the fixing core tube, penetrates through an air distribution plate opening, and is fixed with an air distribution plate; a plurality of flow guide core tube small holes are formed in the periphery of the side surface of the upper part of the flow guide core tube; a plurality of wind cap outer cover small holes incline downwards are formed in the periphery of the side surface of the thickened wall of the lower part of the wind cap outer cover. The abrasion proof slag-leakage resistant has the characteristics of simple structure, convenience for processing and manufacture and easiness in overhaul and replacement.
Description
Technical field
The present invention relates to the blast cap of circulating fluidized bed boiler technical field, be specifically related to a kind of Wear-resistance leak-proof slag blast cap with combination core pipe.
Background technology
The Clean Coal Power Generating Technologies wide as a kind of fuel tolerance, that load regulation rate is large, pollutant discharge amount is low, CFBB has obtained develop rapidly at home and abroad.The safety and economic operation of CFBB is subject to the restriction of many factors, and wherein the important point is exactly to set up stable Matter Transfer, and the blast cap on air distribution plate is significant for realizing goods fluid.Be easy to cause that air compartment leaks the accidents such as slag, fluidisation inequality, bed coking if the blast cap design arrangement is improper, the CFBB after many operation a period of times all occurred that blast cap wearing and tearing and air compartment leaked the slag problem.Have a strong impact on unit after the blast cap wearing and tearing and normally move, increased repair and maintenance workload and operating cost.When blast cap leaks slag, a large amount of red-hot lime-ash can cause the wearing and tearing of air compartment wall after leaking, and stop up air channel when serious and force shutdown of boiler, the impact safety in production.
The kind of the blast cap that CFBB was applied is more, comprises that pig tail type blast cap, cylindrical blast cap, wind cap, bell shape blast cap etc. are several, and what large circulating fluidized bed boiler use at present was maximum is wind cap and bell shape blast cap.
The one or more outlets of wind cap operated by rotary motion, outlet aperture is larger, according to the difference of exit angle, also has square and inclination shape etc. several.Wind cap is higher to installation requirement, need to be proofreaded one by one, otherwise very easily occur that between blast cap, air-flow impacts the wearing and tearing that cause mutually.The wind cap resistance is on the low side, the uneven slag that easily leaks of cloth wind, and the CFBB of many employing wind caps puts into operation after a period of time and all has been transformed into the bell shape blast cap.
The bell shape blast cap is comprised of core pipe and outer cover two parts, and blast cap and core pipe are fixed through air distribution plate, and blast cap is positioned at the upper end of core pipe, and blast cap outer cover surrounding has several apertures, according to the structure difference, can be divided into reverse-flow, embedded etc. several.The subject matter of bell shape blast cap is that service life is short, and inconvenience is changed in maintenance, and wearing and tearing easily appear in bell jar top and aperture exit region, after boiler operatiopn a period of time, there will be resistance in various degree to descend, and leaks the problems such as slag and wearing and tearing aggravation.Trace it to its cause, part bell-type windshield core pipe top is through-hole structure, have larger gap (for example Chinese utility model patent 200420039280.9 bell nozzle button of recirculating fluidized bed boilers) between through hole and outer cover, when bed is pressed and air quantity fluctuates, lime-ash easily flows backwards and enters air compartment from the top through hole.For example, although use outer cover to cover core pipe top through hole (Chinese utility model patent 02290985.0 reverse-flow type blast cap) during some blast cap design, but affected by the factors such as installation, hot operation expansion, still unavoidably produce certain interval, cause the decline of blast cap resistance, the off-design operating mode, cause wearing and tearing and leak slag.
In addition, the fixed form of bell shape blast cap generally has three kinds: (1) utilize own wt to be fixed on the core pipe by outer cover or be supported on the air distribution plate cast bed of material, in actual motion, adopt this mode to fix and easily occur that outer cover comes off, and then slag being leaked in aggravation; By welding by under the blast cap outer cover along being fixed together with the core pipe, this mode can be good at solving the outer cover problem that comes off, and for newly-built boiler, is easy to construction.But be subject to the restriction in blast cap pitch, site operation space etc., being welded and fixed that the maintenance of later stage blast cap is changed is very difficult, is difficult to guarantee construction quality; (3) use the mode be threaded outer cover and core pipe are fixed together (for example Chinese invention patent application 201010228307.9 annular constant-current hoods), in actual motion because CFBB emulsion zone temperature is very high, inclination and lifting that the easy deformed dilation of screw thread produces the blast cap outer cover, also be difficult to dismounting after the cold conditions blowing out, be not easy to maintenance and change.
Be subject to operation conditions impact and the energy-saving and cost-reducing needs that wait, a considerable amount of CFBBs need to undergo technological transformation to blast cap, and existing cap structure form is changed and adjusted difficultly, is not suitable for the boiler technology reform that puts into operation.
Summary of the invention
The shortcoming existed in order to overcome above-mentioned prior art, the object of the present invention is to provide a kind of Wear-resistance leak-proof slag blast cap with combination core pipe, have simple in structure, be convenient to processing and manufacturing, the characteristics that are easy to maintenance and change.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of Wear-resistance leak-proof slag blast cap with combination core pipe, comprise that top has apical pore 10 and bottom has the blast cap outer cover 4 of bottom outlet 11 and passes blast cap outer cover 4 also and its fixing combination core pipe 12, described combination core pipe 12 is by special-shaped plug 1, Water conservancy diversion core pipe 2 and fixed core pipe 3 connect and compose successively, combination core pipe 12 is fixing with blast cap outer cover 4 through the apical pore 10 of blast cap outer cover 4 by special-shaped plug 1, leave the circulation gap between the outer wall of combination core pipe 12 and the inwall of blast cap outer cover 4, combination core pipe 12 closely passes the bottom outlet 11 of blast cap outer cover 4 and fixes through air distribution plate 7 perforates and air distribution plate 7 by fixed core pipe 3, Water conservancy diversion core pipe 2 upper side have a plurality of Water conservancy diversion core pipe apertures 5 along circumference, blast cap outer cover 4 bottoms thicken wall 15 sides and have a plurality of downward-sloping blast cap outer cover apertures 6 along circumference.
Described special-shaped plug 1 comprises special-shaped plug link 16 and special-shaped plug base 17, and special-shaped plug link 16 is circular, rectangle or triangle, together with apical pore 10 welded top of special-shaped plug link 16 outer walls and blast cap outer cover 4.
Described Water conservancy diversion core pipe 2 bottoms are provided with Water conservancy diversion core pipe link 13, and described fixed core pipe 3 tops are provided with fixed core pipe link 14, and Water conservancy diversion core pipe 2 and fixed core pipe 3 are connected by link each other, connected mode for being threaded, welding or cutting ferrule connect.
The row of described Water conservancy diversion core pipe aperture 5 is along Water conservancy diversion core pipe 2 circumference one rows, or the two rows or three rows that are arranged above and below, and the quantity of every row's Water conservancy diversion core pipe aperture 5 is 4～12, and diameter is 3～15mm, outlet wind speed 30～60m/s.
Described blast cap outer cover aperture 6 quantity are 6～20, blast cap outer cover aperture 6 downward-sloping with horizontal sextant angle be 5～30 °, be shaped as the combination of circle, rectangle or circle and rectangle, equivalent diameter is 8～20mm, outlet wind speed 20～50m/s.
The wall thickness of described Water conservancy diversion core pipe 2 and fixed core pipe 3 is 4～12mm, and blast cap outer cover 4 top wall thickness are 10～35mm, and the thickness that bottom thickens wall 15 is 20～45mm.
Described Water conservancy diversion core pipe 2, fixed core pipe 3 and blast cap outer cover 4 all adopt the high nickel heat-resistance stainless steel manufacture that nickel content is 10%～25% to form.
Between 4 times edges of described blast cap outer cover and air distribution plate 7 tops, fire-resistant abrasion-proof castable 9 is arranged, the distance on fire-resistant abrasion-proof castable 9 upper surfaces and 4 times edges of blast cap outer cover is 0～10mm.
Compared with prior art, the present invention has the following advantages:
1. cap structure is simple, is convenient to processing and manufacturing, and production cost is low;
2. adopt combination core pipe mode, while changing Water conservancy diversion core pipe, can not affect the fixed core pipe, be easy to realize modularized design;
3. the fixing point of blast cap outer cover 4 and combination core pipe 12, on blast cap top, is easy to maintenance, changes conveniently; Because blast cap outer cover 4 welds together by blast cap outer cover apical pore 10 and the special-shaped plug link 16 of combination core pipe 12, if need to change blast cap outer cover 4, only need to polish off original pad can carry out.Due to the position of retightening welding, on blast cap top, so constructing operation is easy.
4. fluidized wind passes through fixed core pipe 3 and Water conservancy diversion core pipe 2 successively from air compartment, and from Water conservancy diversion core pipe aperture 5 flows out, flow direction, from transferring to vertically upward vertically downward, tilts to flow into burner hearth by blast cap outer cover aperture 6 afterwards again.Due to air-flow, through repeatedly turning back, and blast cap outer cover aperture 6 is tilted to down, and particle can not deposit, and bulky grain also is difficult to, from combination core pipe 12 air compartment that bleeds, avoid leaking the generation of slag phenomenon.In addition because the exit flow of blast cap outer cover aperture 6 is downward-sloping, fluidisation is more even, reduced the possibility of coking, avoided blast cap washing away of exit flow each other, alleviated wearing and tearing, simultaneously, the little hole number of blast cap outer cover is many, reduced by throughput and the momentum of each aperture, alleviated exit flow and produced blast cap outer cover wear problem to blowing; Can realize optimizing and revising of blast cap resistance by the quantity of adjusting Water conservancy diversion core pipe aperture 5 and blast cap outer cover aperture 6.
5. blast cap outer cover aperture exit region has been carried out to thickening and processed, improved the anti-wear performance of blast cap, extended the service life of blast cap, maintenance cost is low;
6, be applicable to the blast cap transformation of newly-built CFBB and existing CFBB, the retrofit work amount is little.
7. be applicable to the blast cap transformation of newly-built CFBB and existing CFBB, the retrofit work amount is little.
The accompanying drawing explanation
The front view that Fig. 1 is a kind of application example of the present invention.
Fig. 2 is blast cap cover structure figure of the present invention, and wherein: Fig. 2 a is blast cap outer cover master TV structure figure, and Fig. 2 b is blast cap outer cover plan structure figure.
Fig. 3 is combination core duct ligation composition of the present invention.
Fig. 4 is special-shaped stopper structure figure of the present invention, wherein: Fig. 4 a is that special-shaped plug link 16 is circular main TV structure figure, Fig. 4 b is that special-shaped plug link 16 is the main TV structure figure of rectangle, Fig. 4 c is that special-shaped plug link 16 is leg-of-mutton main TV structure figure, Fig. 4 d is that special-shaped plug link 16 is circular plan structure figure, Fig. 4 e is that special-shaped plug link 16 is the plan structure figure of rectangle, and Fig. 4 f is that special-shaped plug link 16 is leg-of-mutton plan structure figure.
Fig. 5 is Water conservancy diversion core pipe structure chart of the present invention.
Fig. 6 is fixed core duct ligation composition of the present invention.
Fig. 7 is blast cap outer cover small structure figure of the present invention, and wherein: Fig. 7 a is circular blast cap outer cover small structure figure, and Fig. 7 b is rectangle blast cap outer cover small structure figure, the combination blast cap outer cover small structure figure that Fig. 7 c is circular and rectangle.
In figure:
1---special-shaped plug 2---Water conservancy diversion core pipe 3---fixed core pipe
4---blast cap outer cover 5---Water conservancy diversion core pipe aperture 6---blast cap outer cover apertures
7---air distribution plate 8---water cooling tube 9---fire-resistant abrasion-proof castables
10---apical pore 11---bottom outlet 12---combination core pipes
13---Water conservancy diversion core pipe link 14---fixed core pipe link 15---thickens wall
16---special-shaped plug link 17---special-shaped plug base
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.
As Fig. 1, shown in Fig. 2 and Fig. 3, a kind of Wear-resistance leak-proof slag blast cap with combination core pipe of the present invention, comprise that top has apical pore 10 and bottom has the blast cap outer cover 4 of bottom outlet 11 and passes blast cap outer cover 4 also and its fixing combination core pipe 12, described combination core pipe 12 is by special-shaped plug 1, Water conservancy diversion core pipe 2 and fixed core pipe 3 connect and compose successively, combination core pipe 12 is fixing with blast cap outer cover 4 through the apical pore 10 of blast cap outer cover 4 by special-shaped plug 1, leave the circulation gap between the outer wall of combination core pipe 12 and the inwall of blast cap outer cover 4, combination core pipe 12 closely passes the bottom outlet 11 of blast cap outer cover 4 and fixes through air distribution plate 7 perforates and air distribution plate 7 by fixed core pipe 3, Water conservancy diversion core pipe 2 upper side have a plurality of Water conservancy diversion core pipe apertures 5 along circumference, blast cap outer cover 4 bottoms thicken wall 15 sides and have a plurality of downward-sloping blast cap outer cover apertures 6 along circumference.Between 4 times edges of described blast cap outer cover and air distribution plate 7 tops, fire-resistant abrasion-proof castable 9 is arranged, the distance on fire-resistant abrasion-proof castable 9 upper surfaces and 4 times edges of blast cap outer cover is 0～10mm.
The row of described Water conservancy diversion core pipe aperture 5 is along Water conservancy diversion core pipe 2 circumference one rows, or the two rows or three rows that are arranged above and below, and the quantity of every row's Water conservancy diversion core pipe aperture 5 is 4～12, and diameter is 3～15mm, outlet wind speed 30～60m/s.
The wall thickness of described Water conservancy diversion core pipe 2 and fixed core pipe 3 is 4～12mm, and blast cap outer cover 4 top wall thickness are 10～35mm, and the thickness that bottom thickens wall 15 is 20～45mm.
Described Water conservancy diversion core pipe 2, fixed core pipe 3 and blast cap outer cover 4 all adopt the high nickel heat-resistance stainless steel manufacture that nickel content is 10%～25% to form.
As shown in Figure 4, described special-shaped plug 1 comprises special-shaped plug link 16 and special-shaped plug base 17, and special-shaped plug link 16 is circular, rectangle or triangle, together with apical pore 10 welded top of special-shaped plug link 16 outer walls and blast cap outer cover 4.
As shown in Figure 5 and Figure 6, described Water conservancy diversion core pipe 2 bottoms are provided with Water conservancy diversion core pipe link 13, described fixed core pipe 3 tops are provided with fixed core pipe link 14, and Water conservancy diversion core pipe 2 and fixed core pipe 3 are connected by link each other, connected mode for being threaded, welding or cutting ferrule connect.Can to Water conservancy diversion core pipe 2, be changed easily.
Described blast cap outer cover aperture 6 quantity are 6～20, blast cap outer cover aperture 6 downward-sloping with horizontal sextant angle be 5～30 °, as shown in Figure 7, it is shaped as the combination of circle, rectangle or circle and rectangle, equivalent diameter is 8～20mm, outlet wind speed 20～50m/s.
A kind of Wear-resistance leak-proof slag blast cap with combination core pipe of the present embodiment has the fire-resistant abrasion-proof castable 9 of 150mm between 4 times edges of blast cap outer cover and air distribution plate 7 tops; Water conservancy diversion core pipe 2 has 2 row's Water conservancy diversion core pipe apertures 5, every row's Water conservancy diversion core pipe aperture is 8 and along Water conservancy diversion core pipe 2 circumferencial direction disposed at equal distance, small aperture is 6mm, blast cap outer cover 4 has the blast cap outer cover aperture 6 of 10 circles, small aperture 15mm, aperture downward-sloping with angle horizontal plane be 15 °; Blast cap outer cover 4, Water conservancy diversion core pipe 2 and fixed core pipe 3 all adopt the casting of ZG40Cr25Ni20 material to form.Water conservancy diversion core pipe 2 and fixed core pipe 3 wall thickness 5mm, blast cap outer cover 4 top wall thickness 10mm, blast cap outer cover 4 bottoms thicken the thickness 20mm of wall 15.
The Renewal process of Wear-resistance leak-proof slag blast cap of the present invention is: when CFBB is changed to blast cap outer cover 4, at first polish off original pad of special-shaped plug link 16 and blast cap outer cover apical pore 10, take off old blast cap outer cover 4 and replace with after new blast cap outer cover 4 and retighten welding and get final product; When CFBB adopted the blast cap of other version originally, owing to leaking, slag is comparatively serious, need be replaced by Wear-resistance leak-proof slag blast cap of the present invention, at first original blast cap core pipe is therefrom blocked, the fixed core pipe 3 that internal diameter is less than to original core pipe inserts, and be fixed together with form and original core pipe of welding, Water conservancy diversion core pipe 2, special-shaped plug 1 and blast cap outer cover 4 are installed respectively afterwards, complete replacing.
Certain boiler originally was equipped with 2615 of bell-type windshields, annual blowing out 3 times needs to change more than 200 of blast caps at every turn, and owing to leaking, slag is comparatively serious, be replaced by after the present invention combines core pipe Wear-resistance leak-proof slag blast cap, each blowing out is changed blast cap quantity and can be reduced in 20.
Claims (8)
1. the Wear-resistance leak-proof slag blast cap with combination core pipe, it is characterized in that: comprise that top has apical pore (10) and bottom has the blast cap outer cover (4) of bottom outlet (11) and passes blast cap outer cover (4) also and its fixing combination core pipe (12), described combination core pipe (12) is by special-shaped plug (1), Water conservancy diversion core pipe (2) and fixed core pipe (3) connect and compose successively, combination core pipe (12) is fixing with blast cap outer cover (4) through the apical pore (10) of blast cap outer cover (4) by special-shaped plug (1), leave the circulation gap between the outer wall of combination core pipe (12) and the inwall of blast cap outer cover (4), combination core pipe (12) closely passes the bottom outlet (11) of blast cap outer cover (4) and fixes through air distribution plate (7) perforate and air distribution plate (7) by fixed core pipe (3), Water conservancy diversion core pipe (2) upper side has a plurality of Water conservancy diversion core pipe apertures (5) along circumference, blast cap outer cover (4) bottom thickens wall (15) side and has a plurality of downward-sloping blast cap outer cover apertures (6) along circumference.
2. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described special-shaped plug (1) comprises special-shaped plug link (16) and special-shaped plug base (17), special-shaped plug link (16) be circle, rectangle or triangle, together with apical pore (10) welded top of special-shaped plug link (16) outer wall and blast cap outer cover (4).
3. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described Water conservancy diversion core pipe (2) bottom is provided with Water conservancy diversion core pipe link (13), described fixed core pipe (3) top is provided with fixed core pipe link (14), Water conservancy diversion core pipe (2) and fixed core pipe (3) are connected by link each other, connected mode for being threaded, welding or cutting ferrule connect.
4. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: the row of described Water conservancy diversion core pipe aperture (5) is for arranging along Water conservancy diversion core pipe (2) circumference one, or the two rows or three rows that are arranged above and below, the quantity of every row's Water conservancy diversion core pipe aperture (5) is 4～12, diameter is 3～15mm, outlet wind speed 30～60m/s.
5. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described blast cap outer cover aperture (6) quantity is 6～20, blast cap outer cover aperture (6) downward-sloping with horizontal sextant angle be 5～30 °, be shaped as the combination of circle, rectangle or circle and rectangle, equivalent diameter is 8～20mm, outlet wind speed 20～50m/s.
6. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: the wall thickness of described Water conservancy diversion core pipe (2) and fixed core pipe (3) is 4～12mm, blast cap outer cover (4) top wall thickness is 10～35mm, and the thickness that bottom thickens wall (15) is 20～45mm.
7. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: described Water conservancy diversion core pipe (2), fixed core pipe (3) and blast cap outer cover (4) all adopt the high nickel heat-resistance stainless steel manufacture that nickel content is 10%～25% to form.
8. the Wear-resistance leak-proof slag blast cap with combination core pipe according to claim 1, it is characterized in that: between the lower edge of described blast cap outer cover (4) and air distribution plate (7) top, fire-resistant abrasion-proof castable (9) is arranged, the distance on the lower edge of fire-resistant abrasion-proof castable (9) upper surface and blast cap outer cover (4) is 0～10mm.
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| CN104560211A (en) * | 2015-01-22 | 2015-04-29 | 兖矿集团有限公司 | Gasification furnace |
| CN105090980A (en) * | 2015-08-19 | 2015-11-25 | 河南科技大学 | Spiral-flow type fluidized bed incinerator |
| CN105090942A (en) * | 2015-08-19 | 2015-11-25 | 河南科技大学 | Micro orientation wind cap device |
| CN105683655A (en) * | 2013-12-11 | 2016-06-15 | 斗山能捷斯有限责任公司 | Air distribution nozzle and a fluidized bed reactor |
| CN106122952A (en) * | 2016-08-17 | 2016-11-16 | 山西平朔煤矸石发电有限责任公司 | A kind of CFB boiler nested type blast cap air-distribution device and remodeling method thereof |
| CN106287684A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of blast cap for CFBB |
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| JP6235189B1 (en) * | 2017-08-30 | 2017-11-22 | 三菱日立パワーシステムズ株式会社 | Air nozzle, outer cylinder, boiler, power generation system, and method for replacing outer cylinder of air nozzle |
| WO2019043830A1 (en) * | 2017-08-30 | 2019-03-07 | 三菱日立パワーシステムズ株式会社 | Air nozzle, outer casing, boiler, power generation system, and method for replacing air nozzle outer casing |
| CN110397915A (en) * | 2018-04-25 | 2019-11-01 | 诚实机械(株) | Fluidized-bed combustion boiler air circulation spray nozzle device |
| CN109028046A (en) * | 2018-07-17 | 2018-12-18 | 丁杨洋 | A kind of blast cap used on boiler in power industry |
| CN109780538A (en) * | 2019-01-24 | 2019-05-21 | 青岛华晨伟业电力科技工程有限公司 | A kind of circulating fluidized bed combustion coal boiler strong wind cap assembly |
| CN111780098A (en) * | 2020-07-24 | 2020-10-16 | 中国科学院工程热物理研究所 | Air distribution device, combustion system and solid material treatment equipment |
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Effective date of registration: 20210527 Address after: 130216 Yingxin village, Helong Town, Nong'an County, Changchun City, Jilin Province Patentee after: CHANGCHUN THERMAL POWER PLANT OF HUANENG JILIN POWER GENERATION Co.,Ltd. Patentee after: Huaneng Clean Energy Research Institute Address before: 100098 26 / F, block a, Yingdu building, No.48, Zhichun Road, Haidian District, Beijing Patentee before: Huaneng Clean Energy Research Institute |