CN1928430A - Bubble fluidised bed combustion device and method for burning-used biologic mass fuel - Google Patents
Bubble fluidised bed combustion device and method for burning-used biologic mass fuel Download PDFInfo
- Publication number
- CN1928430A CN1928430A CN 200610053689 CN200610053689A CN1928430A CN 1928430 A CN1928430 A CN 1928430A CN 200610053689 CN200610053689 CN 200610053689 CN 200610053689 A CN200610053689 A CN 200610053689A CN 1928430 A CN1928430 A CN 1928430A
- Authority
- CN
- China
- Prior art keywords
- burner hearth
- emulsion zone
- biomass
- fuel
- flue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to a bubble fluidized bed combustor with biomass fuel and the method. The combustor comprising higher furnace chamber, binary flue duct and the heating surface such as overheater connected with the binary flue duct. It also contains tail flue, collector, induced fan, chimney and fly-ash return device set on the lower end of binary flue duct where the collecting fly-ashes are delivered into combustion dense phase of furnace so as to improve burnout rate of fly-ash. Said furnace dense phase is various cross-sections. Biomass fuel is delivered into furnace chamber assisted by wind after preprocessed by crushing equipment through the feed port at the front of boiler in parallel, here soft straws is crushed under 10cm and is delivered into boiler. Mature and stable fluidized combustion technology is applied in combusting straws and stalks biomass and it is provided with wide application for stock, high combusting efficiency and efficiently solve the problem of alkali metals during the combusting process of high alkali biomass.
Description
Technical field
The present invention relates to a kind of bubble fluidized bed combustor with biomass fuel and method, described living beings comprise wide variety such as rice wheat straw, branch, shell the agriculture and forestry discarded object.
Background technology
There is very abundant biomass resource in China, and living beings are burnt, and to utilize be for alleviating the conventional energy resource shortage, reducing pollutant emission or straw from village utilizes problem, increasing farmers' income all has very important meaning to solving.But at present domestic still do not have effectively extensive burning to utilize the technological means of living beings, particularly for the stalk raw materials that constitutes China's biomass resource main body.Because stalk has special physics, chemical property and combustion characteristics, having only Denmark to grasp with vibrating-grate stoker at present in the world is the ripe straw burning technology of the basic type of furnace.Because the restriction of China's biomass fuel supplying mode, there are unstable, the characteristics such as complexity is various, the fluctuation of quality kind is big, the preliminary treatment level is low of originating of supply in the biomass resource that is used as fuel, and the combustion system of vibration stove grate furnace has determined its difficulty adaptation China biomass fuel supplying mode.
Fluidized combustion has been widely used in solid-fuelled burning utilizations such as coal, spoil, oil shale, municipal refuse as a kind of mature technique, and demonstrates great vitality.Its basic advantage is very strong fuel tolerance, high burning efficiency and low pollution emission characteristic.But conventional fluid bed also is not suitable for biomass fuel such as direct burning straw, biomass fuel low energy densities, the easy bite of out-of-shape, easily catch fire, high-volatile, low ash, the charred ashes quality is light and soft, alkali metal content is abundant etc., and characteristics bring many troubles can for conventional fluidized combustion process, cause that charging is smooth, upper furnace difficult control of temperature, secondary wind organize that difficulty is big, feed separation and the material circulation is smooth, alkali problem such as is difficult to overcome at problem when using particular organisms matter fuel.
Summary of the invention
The purpose of this invention is to provide a kind of bubble fluidized bed combustor with biomass fuel and method.
Bubble fluidized bed combustor with biomass fuel comprises burner hearth, upper furnace is connected with the secondary flue, is arranged in the heating surface in the secondary flue, what connect subsequently is back-end ductwork, deduster, air-introduced machine and chimney, secondary flue lower disposed has ash bucket, the flying dust of sedimentation melts down the thorax emulsion zone by the fly ash loopback device foldback herein, and the biomass material warehouse is gone into fire door through living beings disintegrating apparatus and burner hearth and joined.
The variable cross-section chamber structure that described burner hearth emulsion zone is high breadth depth ratio, burner hearth emulsion zone lower furnace sectional area minimum, breadth depth ratio is 5: 1～1.5: 1.Living beings particle diameter through the fragmentation of living beings disintegrating apparatus is below the 10cm.The fire box temperature of burner hearth emulsion zone is 600～700 ℃.
The bubbling fluidization bed combustion process of burning-used biologic mass fuel:
1) adopts the bed material of secondary wind and narrow-size distribution small grain size to make burner hearth emulsion zone running temperature, reduce the poly-group of bed material of burner hearth emulsion zone at 600～700 ℃;
2) improve furnace height, increase the water-cooling wall in the burner hearth, the temperature that makes burner hearth fugitive constituent combustion zone improves the burnout rate of living beings semicoke at 730 ℃～780 ℃, reduces the burner hearth slagging scorification;
3) wall-cooling surface of arranging in the secondary flue makes the flue-gas temperature that enters convection heating surface be lower than 820 ℃, alleviates the high temperature corrosion of wall-cooling surface and the dust stratification of wall-cooling surface;
4) flying dust that makes the sedimentation of secondary flue below enter ash bucket by the cinder reinjection loop is sent burner hearth back to and is further burnt;
5) adopt low fluidising air velocity, wherein, burner hearth emulsion zone bottom wind speed is 2～4m/s, and burner hearth emulsion zone top wind speed is 1～3m/s, reduces the bed material loss late of narrow-size distribution small grain size.
The granularity of described narrow-size distribution small grain size bed material is less than 2mm.
Beneficial effect of the present invention
1) efficiency of combustion height.Higher chamber design has guaranteed the dilute-phase zone combustion space, has reduced a large amount of fugitive constituents and has separated out the too fast danger that causes heat loss due to unburned gases to increase in burner hearth inside.In fluidized combustion good gas, mix and the fragmentation of semicoke particle, burn characteristic admittedly, cooperate narrow-size distribution small grain size bed material, the design of variable cross-section chamber structure, and the cinder reinjection system that is equipped with can effectively improve the burnout rate of semicoke, solve the high problem of unburned carbon in flue dust in the conventional design scheme, reach higher efficiency of combustion;
2) fuel tolerance is wide, the present invention has inherited these characteristics of fluidized combustion, employing with various biomass fuel simple crushings to below the 10cm directly into stove, preparation of fuel and feeding system have not only been simplified, also increased tolerance and the adaptability of equipment greatly to biomass fuel quality, kind change, reduced and gone into stove fuel preliminary treatment expense, also simplified boiler design, improved the redundant reliability of fuel for the system of feeding;
3) by particular design and burning tissue to boiler, can guarantee that fuel and bed material are repeatedly stable in the bubbling fluidization bed system burns swimmingly, each several part keeps rational temperature to distribute in the stove, successfully solves high-alkali the living beings poly-group of recurrent bed material, slagging scorification, deposition and high temperature corrosion problem in burning simultaneously.
Description of drawings
Accompanying drawing is the bubble fluidized bed combustor with biomass fuel structural representation;
Among the figure: biomass material warehouse 1, living beings disintegrating apparatus 2, burner hearth 3, secondary flue 4, fuel are gone into fire door 5, variable cross-section burner hearth emulsion zone 6, fly ash loopback device 7, sedimentation ash bucket 8, convection heating surface 9, back-end ductwork 10, deduster 11, air-introduced machine 12, chimney 13.
The specific embodiment
As shown in drawings, bubble fluidized bed combustor with biomass fuel comprises burner hearth 3, upper furnace is connected with secondary flue 4, is arranged in the convection heating surface 9 in the secondary flue, what connect subsequently is back-end ductwork 10, deduster 11, air-introduced machine 12 and chimney 13, secondary flue 4 lower disposed have sedimentation ash bucket 8, the flying dust of sedimentation returns variable cross-section burner hearth emulsion zone 6 by fly ash loopback device 7 foldbacks herein, and biomass material warehouse 1 is gone into fire door 5 through living beings disintegrating apparatus 2 and fuel and joined.
The bubble fluidised bed combustion device of biomass fuel is before operation, earlier the bed material is carried out the granularity screening, bed material maximum particle diameter is controlled at below the 2mm, determine corresponding bed material average grain diameter according to different biomass density, carry out narrow-size distribution with this again after bed material average grain diameter is determined and select, deliver to the burner hearth emulsion zone by material inlet then.Narrow-size distribution bed material can effectively be alleviated the mass loss of material in running in the stove, prolongs the bed material and replenishes the cycle, reduces operating cost.Send into a wind from burner hearth emulsion zone bottom and heat, a wind that heat makes during through the bed material bed expects to seethe bubbling, simultaneously the bed material is heated to more than 600 ℃.To comprise rice straw simultaneously, straw shreds below the 10cm through the living beings disintegrating apparatus at interior various biomass fuels, go into fire door by the fuel that the feeding coal control appliance is delivered to the stokehold with living beings, living beings are admitted to variable cross-section burner hearth emulsion zone then, variable cross-section burner hearth emulsion zone mainly is made of the narrow-size distribution small grain size bed material and the living beings ash of high temperature, initiate biomass fuel mixes with the narrow-size distribution small grain size bed material that heating is seethed rapidly under a wind action, and begins to take place the combustion process of pyrolysis and coke and fugitive constituent.By controlling the air quantity of a wind, the running temperature that makes variable cross-section burner hearth emulsion zone can reduce because the bed material that alkali metal brings gathers clique problem, thereby avoid the appearance of fluidisation failure problem at 600～700 ℃.The breadth depth ratio that section of burner hearth adopts is design in 5: 1～1.5: 1, and the good vertically transmission of the biomass fuel that can promote each material inlet to feed effectively, physical separation and normal combustion are disintegrated.The fugitive constituent that not having enough time of separating out in the living beings semicoke mixing implantation material particle of burner hearth emulsion zone disassociation, elutriation and emulsion zone participates in burning enters the suspension section on burner hearth emulsion zone top rapidly, a large amount of secondary wind that layering is sent in this section are assisted further burning of living beings fugitive constituent.The suspension section flue gas flow rate is controlled in below 1～3m/s by the section of burner hearth expansion, to prolong height 10～20% that increases burner hearth 3 and the water-cooling wall area 20～30% that increases in the burner hearth as far as possible, the combustion zone temperature that makes the burner hearth suspension section is at 730 ℃～780 ℃, can improve the burnout rate of living beings semicoke, reduce the burner hearth slagging scorification.The convection current wall-cooling surface of arranging in the secondary flue makes the flue-gas temperature that enters convection heating surface be lower than 820 ℃, can alleviate the high temperature corrosion of convection current wall-cooling surface and the dust stratification of wall-cooling surface.Contain simultaneously and give birth to trickle semicoke particle, increase burnout rate and guarantee the stable of emulsion zone temperature in the time of staying in furnace high-temperature district.Flue gas flowing velocity in the secondary flue that material does not burn flying dust reduces, flying dust is deposited in the ash bucket at turning, secondary flue bottom, the living beings flying dust that fly ash loopback device will not burn is sent into the burner hearth burning once more, circulating combustion can further improve the efficiency of combustion of living beings like this, reduces heat loss due to combustibles in refuse.In the secondary flue sedimentation cross flying dust hot flue gas enter boiler back end ductwork after through the convection heating surface that is arranged in secondary flue afterbody, each heating surface of successively flowing through after being purified by deduster, through air-introduced machine, is discharged by chimney at last.
This shows; the bubble fluidised bed combustion device of biomass fuel and method; ripe, reliable fluidized combustion technology is used for the burning of stalk biomass; substantially solved the variety of issue in the soft straw power generation process of biomass burning; and it is wide to have adaptability to raw material; the efficiency of combustion advantages of higher not only is converted into biomass resource valuable electric energy, and also the extensiveization utilization for the biomass resource of China's abundant provides the effective and feasible approach that utilizes.
Claims (6)
1. bubble fluidized bed combustor with biomass fuel, it is characterized in that, it comprises burner hearth (3), upper furnace is connected with secondary flue (4), be arranged in the convection heating surface (9) in the secondary flue, what connect subsequently is back-end ductwork (10), deduster (11), air-introduced machine (12) and chimney (13), secondary flue (4) lower disposed has sedimentation ash bucket (8), the flying dust of sedimentation returns variable cross-section burner hearth emulsion zone (6) by fly ash loopback device (7) foldback herein, and biomass material warehouse (1) is gone into fire door (5) through living beings disintegrating apparatus (2) and fuel and joined.
2. a kind of bubble fluidized bed combustor with biomass fuel according to claim 1, it is characterized in that, described burner hearth emulsion zone (6) is the variable cross-section chamber structure of high breadth depth ratio, burner hearth emulsion zone lower furnace sectional area minimum, and breadth depth ratio is 5: 1～1.5: 1.
3. according to the described a kind of bubble fluidized bed combustor with biomass fuel of claim 1, it is characterized in that described is below the 10cm through the broken living beings particle diameter of living beings disintegrating apparatus (2).
4. according to the described a kind of bubble fluidized bed combustor with biomass fuel of claim 1, it is characterized in that the fire box temperature of described burner hearth emulsion zone (6) is 600～700 ℃.
5. the bubbling fluidization bed combustion process of the burning-used biologic mass fuel that installs according to claim 1 of a use is characterized in that:
1) adopts the bed material of secondary wind and narrow-size distribution small grain size to make burner hearth emulsion zone running temperature, reduce the poly-group of bed material of burner hearth emulsion zone at 600～700 ℃;
2) improve furnace height, increase the water-cooling wall in the burner hearth, the temperature that makes burner hearth fugitive constituent combustion zone improves the burnout rate of living beings semicoke at 730 ℃～780 ℃, reduces the burner hearth slagging scorification;
3) wall-cooling surface of arranging in the secondary flue makes the flue-gas temperature that enters convection heating surface be lower than 820 ℃, alleviates the high temperature corrosion of wall-cooling surface and the dust stratification of wall-cooling surface;
4) flying dust that makes the sedimentation of secondary flue below enter ash bucket by the cinder reinjection loop is sent burner hearth back to and is further burnt;
5) adopt low fluidising air velocity, wherein, burner hearth emulsion zone bottom wind speed is 2～4m/s, and burner hearth emulsion zone top wind speed is 1～3m/s, reduces the bed material loss late of narrow-size distribution small grain size.
6. the bubbling fluidization bed combustion process of a kind of burning-used biologic mass fuel according to claim 5, its feature is that also the granularity of described narrow-size distribution small grain size bed material is less than 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610053689 CN1928430A (en) | 2006-09-29 | 2006-09-29 | Bubble fluidised bed combustion device and method for burning-used biologic mass fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610053689 CN1928430A (en) | 2006-09-29 | 2006-09-29 | Bubble fluidised bed combustion device and method for burning-used biologic mass fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1928430A true CN1928430A (en) | 2007-03-14 |
Family
ID=37858502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610053689 Pending CN1928430A (en) | 2006-09-29 | 2006-09-29 | Bubble fluidised bed combustion device and method for burning-used biologic mass fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1928430A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614392B (en) * | 2008-06-23 | 2011-02-16 | 中国华电工程(集团)有限公司 | Circulating fluidized bed boiler burning straw-like biomass and feeding method |
| CN102002399A (en) * | 2010-11-15 | 2011-04-06 | 国电长源电力股份有限公司 | Fluidized bed gasification reaction method and reactor employing packed fuel |
| CN105546524A (en) * | 2015-12-11 | 2016-05-04 | 重庆生息节能技术有限公司 | Biomass combustion technology |
| CN107002989A (en) * | 2014-12-22 | 2017-08-01 | 因姆普朗伯德公司 | The bed burnt for bubbling fluidized bed |
| CN108644763A (en) * | 2018-05-11 | 2018-10-12 | 清华大学 | A kind of circulating fluidized bed boiler and its operation method |
| CN110107890A (en) * | 2019-04-02 | 2019-08-09 | 张正周 | A method of preventing circulating fluidized bed boiler coking |
-
2006
- 2006-09-29 CN CN 200610053689 patent/CN1928430A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614392B (en) * | 2008-06-23 | 2011-02-16 | 中国华电工程(集团)有限公司 | Circulating fluidized bed boiler burning straw-like biomass and feeding method |
| CN102002399A (en) * | 2010-11-15 | 2011-04-06 | 国电长源电力股份有限公司 | Fluidized bed gasification reaction method and reactor employing packed fuel |
| CN107002989A (en) * | 2014-12-22 | 2017-08-01 | 因姆普朗伯德公司 | The bed burnt for bubbling fluidized bed |
| CN105546524A (en) * | 2015-12-11 | 2016-05-04 | 重庆生息节能技术有限公司 | Biomass combustion technology |
| CN108644763A (en) * | 2018-05-11 | 2018-10-12 | 清华大学 | A kind of circulating fluidized bed boiler and its operation method |
| CN108644763B (en) * | 2018-05-11 | 2024-04-09 | 清华大学 | Circulating fluidized bed boiler and operation method thereof |
| CN110107890A (en) * | 2019-04-02 | 2019-08-09 | 张正周 | A method of preventing circulating fluidized bed boiler coking |
| CN110107890B (en) * | 2019-04-02 | 2020-06-26 | 淄博齐林贵和热电有限公司 | Method for preventing circulating fluidized bed boiler from coking |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100408917C (en) | Circulating fluidized bed combustion device with biomass fuel and combustion method thereof | |
| US9784445B2 (en) | External bed type double-fluidized bed system for preventing boiler contamination | |
| CN101949535A (en) | Low-ratio biomass circulating fluidized bed boiler and combustion method thereof | |
| CN1928430A (en) | Bubble fluidised bed combustion device and method for burning-used biologic mass fuel | |
| CN1978591A (en) | Circulating fluidized bed heat-power-gas-tar multi-joint-production apparatus and method | |
| CN110358578A (en) | A kind of fire coal coupled biological matter power generating simultaneously charcoal system | |
| CN201526953U (en) | Biomass gasified combustion coupling cyclone boiler | |
| CN101122384A (en) | Biomass high temperature combustion boiler | |
| CN102927564A (en) | Method of reducing fly ash carbon content of circulating fluidized bed boiler | |
| CN109990267A (en) | A kind of low NO mixing fired biomass suitable for low-volatility fuelxCombustion system | |
| CN102878569B (en) | High-temperature air combustion intensifying device and method applicable to low heating value mixed garbage | |
| CN101206026A (en) | Combustion device and method for biomass birdnesting slagoff fluidized bed | |
| CN102042585B (en) | Reburning and discharging device of slag and soot of biomass direct-fired power generation boiler | |
| CN201225613Y (en) | Circulating fluid bed boiler of stalk biomass for combustion | |
| CN201149245Y (en) | Biomass high temperature combustion boiler | |
| CN201834891U (en) | Continuous gasification and carbonization furnace with rotary rake moving bed | |
| CN113203104A (en) | Household heating and cooking combined stove using trumpet creepers as fuel and using method thereof | |
| CN201539851U (en) | Biomass boiler | |
| WO2013020360A1 (en) | Differential-velocity multi-cyclone conical-bed air distribution structure | |
| CN202973046U (en) | Biomass energy-saving boiler | |
| CN202757256U (en) | Pulse combustion type hot blast heating device for biomass fuels | |
| CN102252325A (en) | Circulating fluidized bed boiler capable of burning rice husks | |
| CN101614392B (en) | Circulating fluidized bed boiler burning straw-like biomass and feeding method | |
| CN212252712U (en) | Biomass particle baking furnace | |
| CN109735371A (en) | A kind of biomass circulating fluidized bed direct-combustion boiler and its with gasification furnace coupled electricity-generation co-producing active carbon system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |