CN210740376U - Biomass mixed fuel fluidization ignition system of circulating fluidized bed boiler - Google Patents
Biomass mixed fuel fluidization ignition system of circulating fluidized bed boiler Download PDFInfo
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- CN210740376U CN210740376U CN201921485437.3U CN201921485437U CN210740376U CN 210740376 U CN210740376 U CN 210740376U CN 201921485437 U CN201921485437 U CN 201921485437U CN 210740376 U CN210740376 U CN 210740376U
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Abstract
The utility model discloses a biomass mixed fuel fluidization ignition system of a circulating fluidized bed boiler, which comprises a fuel feeding unit, a fluidized bed-riser coupling reaction unit, an air supply unit and the circulating fluidized bed boiler, wherein the fluidized bed-riser coupling reaction unit comprises a fluidized bed reactor, a riser and a separator which form a circulating flow path, the riser is connected with a discharge port at the top of the fluidized bed reactor and is connected with a feed inlet of the separator, and a bottom discharge port of the separator is connected with a feed back port of the fluidized bed reactor; the fuel feeding unit is connected with a feeding hole of the fluidized bed reactor, and the air supply unit is connected with an igniter air distribution device in the fluidized bed reactor; the top discharge hole of the separator is connected with a hearth or a water-cooling air chamber of the circulating fluidized bed boiler. The utility model discloses can effectively utilize living beings blended fuel and guarantee its burnout nature, reach and reduce fluidized bed boiler ignition cost and realize the purpose of the clean ignition burning of living beings blended fuel.
Description
Technical Field
The utility model relates to a technical field that the clean energy of living beings utilized, more specifically say, relate to a circulating fluidized bed boiler living beings mixed fuel fluidization ignition system.
Background
With the increasing tension of world energy, especially under the severe situation that the price of oil fuel is high, finding a method for reducing oil consumption or a new fuel for replacing oil fuel becomes a common target of the energy industry. Compared with the traditional fossil energy, the biomass fuel is a novel renewable clean energy, the emission of carbon dioxide after combustion belongs to the carbon cycle of the nature, no pollution is formed, and the emission of pollutants such as carbon dioxide and sulfur dioxide can be obviously reduced. And the biomass reserves in China are large, the environment is easily polluted by local abandonment, incineration and the like, and the effective utilization of the biomass has important significance for relieving the energy shortage, improving the environment, expanding the industrial scale of villages and towns and promoting the development of circular economy.
At present, ignition modes generally adopted by a large circulating fluidized bed boiler include on-bed ignition, under-bed ignition and combined ignition on-bed and under-bed. The ignition fuel is generally heavy oil, diesel oil, natural gas and the like, and when the oil fuel is adopted for ignition, the burnout is poor and pollutants (NOx and SO) exist2) High emission, high cost of oil and natural gas fuels, and poor ignition economy. And the existing biomass is utilized for ignition under the bedThe technology of the biomass ignition technology under the biomass bed is immature, the problems of carbon deposition in the ignition air channel, dust deposition and blockage of the hood and the like are easily caused, and potential safety hazards are brought to the ignition of the circulating fluidized bed boiler.
SUMMERY OF THE UTILITY MODEL
To solve the problems in the prior art, an object of the present invention is to provide a system for igniting and starting a circulating fluidized bed boiler by using the technologies of pneumatic transmission, fluidized ignition, fluidized bed-riser coupled reaction, etc. to fully combust biomass mixed fuel and use the combustion heat thereof.
The utility model provides a biomass mixed fuel fluidization ignition system of a circulating fluidized bed boiler, which comprises a fuel feeding unit, a fluidized bed-riser coupling reaction unit, an air supply unit and the circulating fluidized bed boiler, wherein,
the fluidized bed-riser coupling reaction unit comprises a fluidized bed reactor, a riser and a separator, wherein the fluidized bed reactor, the riser and the separator form a circulating flow path, the riser is connected with a discharge hole in the top of the fluidized bed reactor and is connected with a feed inlet of the separator, and a discharge hole in the bottom of the separator is connected with a feed back hole of the fluidized bed reactor;
the fuel feeding unit is connected with a feeding hole of the fluidized bed reactor, and the air supply unit is connected with an igniter air distribution device in the fluidized bed reactor; and a discharge port at the top of the separator is connected with a hearth or a water-cooling air chamber of the circulating fluidized bed boiler.
According to circulating fluidized bed boiler biomass mixed fuel fluidization ignition system's an embodiment, fuel feeding unit is including the bunker and the batcher that establish ties and set up, the biomass mixed fuel has been stored in the bunker.
According to an embodiment of circulating fluidized bed boiler biomass mixed fuel fluidization ignition system, air feed unit is including primary air fan, booster fan and the electric heater that the series connection set up, and electric heater's hot air exitus links to each other with the hot-blast entry of igniter cloth wind device in the fluidized bed reactor.
According to circulating fluidized bed boiler biomass blended fuel fluidization ignition system's an embodiment, the air cooling plenum that the primary air fan still links to each other with circulating fluidized bed boiler is in order to supply a wind.
According to an embodiment of circulating fluidized bed boiler biomass mixed fuel fluidization ignition system, still be provided with the cinder notch among the fluidized bed reactor, the separator is high-efficient cyclone.
The utility model discloses utilize fluidization technique, design a fluidization ignition system who burns with living beings mixed fuel, this technique can effectively utilize living beings mixed fuel and guarantee its burnout nature, solves living beings mixed fuel and ignites burnout nature poor, the easy carbon deposit deposition of bed under and blocks up the hood scheduling problem, reaches the purpose that reduces fluidized bed boiler ignition cost and realize living beings mixed fuel clean ignition burning.
Drawings
Fig. 1 shows a schematic structural diagram of a biomass mixed fuel fluidization ignition system of a circulating fluidized bed boiler according to an exemplary embodiment of the present invention.
Description of reference numerals:
1-a fuel bin, 2-a feeder, 3-an igniter air distribution device, 4-an electric heater, 5-a booster fan, 6-a primary fan, 7-a fluidized bed reactor, 8-a riser, 9-a slag discharge port, 10-a separator, 11-a hearth of a circulating fluidized bed boiler and 12-a water cooling air chamber of the circulating fluidized bed boiler.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Fig. 1 shows a schematic structural diagram of a biomass mixed fuel fluidization ignition system of a circulating fluidized bed boiler according to an exemplary embodiment of the present invention.
As shown in fig. 1, according to an exemplary embodiment of the present invention, the biomass mixed fuel fluidization ignition system of the circulating fluidized bed boiler comprises a fuel feeding unit, a fluidized bed-riser coupled reaction unit, an air supply unit and the circulating fluidized bed boiler. The biomass fuel combustion system comprises a fuel feeding unit, a fluidized bed-riser coupling reaction unit, an air supply unit, a fluidized bed boiler material fluidizing unit and a fluidized bed boiler material heating unit, wherein the fuel feeding unit is used for conveying fuel, the fluidized bed-riser coupling reaction unit is used for igniting and combusting biomass fuel, the air supply unit is used for providing air flow and pressure required by combustion, and flue gas after biomass combustion reaction is used for fluidizing the fluidized bed boiler material or heating the fluidized bed.
Specifically, the fluidized bed-riser coupled reaction unit comprises a fluidized bed reactor 7, a riser 8 and a separator 10, wherein the fluidized bed reactor 7, the riser 8 and the separator 10 form a circulating flow path, the riser 8 is connected with a discharge port at the top of the fluidized bed reactor 7 and is connected with a feed port of the separator 10, and a discharge port at the bottom of the separator 10 is connected with a feed back port of the fluidized bed reactor 7, so that the circulating flow path is formed. The fluidized bed reactor 7 provides a place for facilitating combustion reaction of biomass mixed fuel with proper particle size, the fuel feeding unit is connected with a feeding port of the fluidized bed reactor 7, the air supply unit is connected with an igniter air distribution device 4 in the fluidized bed reactor 7, a discharge port at the top of the separator 10 is connected with a hearth 11 or a water cooling air chamber 12 of the circulating fluidized bed boiler, and hot flue gas generated by combustion is used for heating and starting bed materials of the circulating fluidized bed boiler.
Therefore, the system of the invention utilizes a pneumatic conveying method to convey biomass mixed fuel particles into a fluidized bed reactor of a fluidized bed-riser coupling reaction unit for heating and ignition; on the other hand, the fluidized bed is coupled with a riser technology, biomass mixed fuel particles are fully combusted in the fluidized bed-riser coupling reaction unit, the heat after combustion is brought into a water cooling air chamber or a hearth of the boiler by primary air of the boiler, and biomass mixed fuel particles which are not fully combusted are captured by a separator for circular combustion, so that the burnout performance of the biomass mixed fuel is ensured.
Preferably, the utility model discloses a fuel feeding unit has biomass mixed fuel including bunker and 1 batcher 2 that the series connection set up, and 1 internal storage of bunker has then biomass mixed fuel to send into fluidized bed reactor through batcher 2. The utility model discloses an air feed unit is including the primary air fan 6, booster fan 5 and the electric heater 4 that the series connection set up, and electric heater 6's hot air outlet links to each other with the hot-blast entry of igniter cloth wind device 4 in fluidized bed reactor 7, then the cold wind of primary air fan is sent into fluidized bed reactor through some firearm cloth wind device after the electric heater heating by booster fan pressure boost. In addition, a slag discharge port 9 is provided in the fluidized-bed reactor 7 to discharge large unburned particles.
The primary air fan 6 of the present invention can be connected to the water cooling plenum 12 of the circulating fluidized bed boiler to supply primary air. The utility model discloses a separator preferred be high-efficient cyclone, can catch fluidized bed reactor, the biomass fuel mixture that does not burn to the greatest extent in the riser.
The utility model discloses ignition system's working method specifically does: the biomass mixed fuel in the fuel bin 1 is conveyed into the fluidized bed reactor 7 by the feeder 2, and meanwhile, the cold air at the outlet of the primary fan 6 is pressurized by the booster fan 5, heated by the electric heater 4 and then conveyed into the fluidized bed reactor 7 by the igniter air distribution device 3, and the biomass mixed fuel is ignited and combusted in the fluidized bed reactor. After the fuel is ignited, the biomass mixed fuel is subjected to continuous reaction combustion in the fluidized bed reactor 7, and unburnt fuel particles enter the riser 8 for continuous reaction. The reacted particles are collected by the separator 10 and then enter the fluidized bed reactor 7 and the riser 8 again for circular combustion until being burnt out, the reacted flue gas enters a water-cooling air chamber 12 of the circulating fluidized bed boiler from the outlet of the separator 10 or directly enters a hearth 11 of the circulating fluidized bed boiler at the upper part of the air chamber to heat the starting bed material, and large particles which are not burnt out in the combustion process are discharged from a slag discharge port 9.
Compare with traditional oil ignition system, the utility model has the advantages of its heat that can make full use of living beings fuel mixture, reduce circulating fluidized bed boiler ignition cost and improve the economic nature that the power plant igniteed. Compared with the existing biomass bed ignition technology, the utility model discloses a fluidized bed reactor-riser coupling reaction technology can make the double-phase circulation section circulation flow in the bottom of gas-solid, has increased the dwell time of granule in the circulation section, has improved the double-phase mass transfer heat transfer efficiency of gas-solid, can guarantee biomass fuel mixture's complete combustion.
To sum up, the biomass mixed fuel fluidization ignition system of the circulating fluidized bed boiler adopts the biomass mixed fuel as the ignition fuel of the fluidized bed boiler, fully utilizes the clean fuel, reduces the ignition cost of a power plant, and improves the ignition economy of the power plant; meanwhile, the natural grading and high-efficiency conversion under different thermochemical conditions of the biomass fuels with different granularities are realized by utilizing the fluidization and pneumatic transmission characteristics of different biomass fuel granularities; by adopting the fluidized bed reactor-riser coupling reaction technology, the gas-solid two phases of the biomass mixed fuel can flow in a circulating flow at the bottom circulating section of the fluidized bed reactor in a circulating manner, so that the retention time of particles in the circulating flow is prolonged, and the mass transfer and heat transfer efficiency of the gas-solid two phases is improved; the complete combustion of the biomass mixed fuel can be ensured, and the problems of poor ignition burnout property of biomass under a fluidized bed boiler bed, carbon deposition in an air duct, blockage of an air cap and the like are solved;
the present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (5)
1. A biomass mixed fuel fluidization ignition system of a circulating fluidized bed boiler is characterized by comprising a fuel feeding unit, a fluidized bed-riser coupling reaction unit, an air supply unit and the circulating fluidized bed boiler, wherein,
the fluidized bed-riser coupling reaction unit comprises a fluidized bed reactor, a riser and a separator, wherein the fluidized bed reactor, the riser and the separator form a circulating flow path, the riser is connected with a discharge hole in the top of the fluidized bed reactor and is connected with a feed inlet of the separator, and a discharge hole in the bottom of the separator is connected with a feed back hole of the fluidized bed reactor;
the fuel feeding unit is connected with a feeding hole of the fluidized bed reactor, and the air supply unit is connected with an igniter air distribution device in the fluidized bed reactor; and a discharge port at the top of the separator is connected with a hearth or a water-cooling air chamber of the circulating fluidized bed boiler.
2. The fluidized ignition system of biomass mixed fuel of the circulating fluidized bed boiler according to claim 1, wherein the fuel feeding unit comprises a fuel bin and a feeder which are arranged in series, and the fuel bin stores the biomass mixed fuel.
3. The biomass mixed fuel fluidized ignition system of the circulating fluidized bed boiler according to claim 1, wherein the air supply unit comprises a primary air fan, a booster fan and an electric heater which are arranged in series, and a hot air outlet of the electric heater is connected with a hot air inlet of an igniter air distribution device in the fluidized bed reactor.
4. The fluidized ignition system of biomass mixed fuel of the circulating fluidized bed boiler of claim 3, characterized in that the primary air fan is further connected with the water cooling plenum of the circulating fluidized bed boiler to supply primary air.
5. The fluidized ignition system for the biomass mixed fuel of the circulating fluidized bed boiler according to claim 1, wherein a slag discharge port is further arranged in the fluidized bed reactor, and the separator is a high-efficiency cyclone separator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921485437.3U CN210740376U (en) | 2019-09-06 | 2019-09-06 | Biomass mixed fuel fluidization ignition system of circulating fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921485437.3U CN210740376U (en) | 2019-09-06 | 2019-09-06 | Biomass mixed fuel fluidization ignition system of circulating fluidized bed boiler |
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| CN210740376U true CN210740376U (en) | 2020-06-12 |
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| CN201921485437.3U Active CN210740376U (en) | 2019-09-06 | 2019-09-06 | Biomass mixed fuel fluidization ignition system of circulating fluidized bed boiler |
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