CN100441946C - Boiler system of circulating fluid bed burning in oxygen enrichment - Google Patents
Boiler system of circulating fluid bed burning in oxygen enrichment Download PDFInfo
- Publication number
- CN100441946C CN100441946C CNB2006101249943A CN200610124994A CN100441946C CN 100441946 C CN100441946 C CN 100441946C CN B2006101249943 A CNB2006101249943 A CN B2006101249943A CN 200610124994 A CN200610124994 A CN 200610124994A CN 100441946 C CN100441946 C CN 100441946C
- Authority
- CN
- China
- Prior art keywords
- boiler
- links
- air
- gas
- bed
- Prior art date
Links
- 239000001301 oxygen Substances 0.000 title claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 26
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000007789 gases Substances 0.000 claims abstract description 47
- 239000003570 air Substances 0.000 claims abstract description 28
- 230000001105 regulatory Effects 0.000 claims abstract description 22
- 230000003134 recirculating Effects 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 3
- 238000002485 combustion reactions Methods 0.000 abstract description 9
- 239000010881 fly ash Substances 0.000 abstract description 7
- 239000000446 fuels Substances 0.000 abstract description 7
- 239000000203 mixtures Substances 0.000 abstract description 4
- 239000002245 particles Substances 0.000 abstract description 2
- 230000001276 controlling effects Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 16
- 239000003546 flue gases Substances 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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- 229910052813 nitrogen oxides Inorganic materials 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous Oxide Chemical compound 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[O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011901 water Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
Description
Technical field
The present invention relates to boiler system of circulating fluid bed burning in oxygen enrichment, be applicable to that mainly using coal etc. is the solid fuel of main component with carbon.
Background technology
At present, domestic and international most of boiler all is the oxidant that acts as a fuel with air, and the flue gas that burning produces is arranged to atmosphere after certain processing.Though air is available anywhere, need not special producing equipment, because airborne N 2Can not participate in burning, and take away the part heat that burning produces, thereby increase heat loss due to exhaust gas; Simultaneously, N 2In combustion process, can oxidized generation produce the nitrogen oxide that pollutes to environment.In addition, when burning is the solid fuel (for example coal) of main component with carbon, contain greenhouse gases CO in the flue gas of generation 2, can not directly arrange to atmosphere, need be to CO 2Separate recovery, but because the CO that contains in the flue gas 2Concentration ratio lower (about 13%-15%) is under lower pressure, from N 2Be to isolate CO in the flue gas of leading 2Difficulty very big, cause the separation equipment complexity, cost is higher.
O 2/ CO 2Combustion technology is one of effective way that addresses the above problem, and promptly mixes the oxidant the when gaseous mixture that obtains replaces air to act as a fuel burning with the high-concentration oxygen of air separation acquisition and the flue gas recycled of a part of boiler tail.Concentration of oxygen is generally 21% in the gaseous mixture, improves the CO in the boiler tail flue gas by repeatedly circulating 2Concentration is so that reclaim.
" Energy Conversion and Management " (power conversion and management) magazine has been shown one piece of article 1992 the 33rd curly hair, title of article is " Pulverized coal combustion inO2/CO2 mixture on a power plant for CO2 recovery " (being used for reclaiming the pulverized coal friring of the O2/CO2 mixture of CO2 in the generating equipment), and people such as the author Nakayama of article have proposed a cover in the text and had exhaust gas cleaning process and CO 2The O of liquid withdrawal system 2/ CO 2Combustion boiler system.The CO of this system recoveries 2Concentration can reach more than 90%, and the efficient of system is compared and adopted the system of air burning to improve about 4.5%.But, O 2/ CO 2Combustion boiler system has also just changed airborne nitrogen into boiler tail flue gas, and the shared volume share of oxygen is constant substantially, has still greatly that gas can not participate in burning, and gas flow is very big, makes that the volume ratio of boiler is bigger, and cost is higher.In addition, temperature is restive in the burner hearth, and pre-heater gas takes place easily leaks.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, propose a kind of boiler system of circulating fluid bed burning in oxygen enrichment.This system adopts the CFBB that has the external fluid-bed heat exchanger, and at O 2/ CO 2On the basis of combustion technology, improve the oxygen concentration (reaching 29%-60%) in the oxidant enter boiler, efficiency of combustion height not only, pollutant emission is few, can reclaim the CO in the flue gas easily 2, and boiler volume is smaller, has reduced the boiler cost.
For achieving the above object, the technical solution used in the present invention is: recirculating fluidized bed burner hearth, downward air discharge cyclone separator and afterbody convection recuperator link to each other successively, afterbody convection recuperator, pre-heater, dedusting link to each other with gas cooler successively with desulfurizer, and gas cooler is by air-introduced machine, first gas flow regulating valve and CO 2Retracting device links to each other, gas cooler passes through air-introduced machine, first gas flow regulating valve, second gas flow regulating valve, gas recirculating fan links to each other with pre-heater, gas cooler passes through air-introduced machine, first gas flow regulating valve, second gas flow regulating valve, the fluidized wind pressure fan links to each other with the external fluid-bed heat exchanger, air separator links to each other with the recirculating fluidized bed burner hearth by same pipeline with pre-heater, the outlet at bottom of downward air discharge cyclone separator links to each other with the returning charge controller, the outlet of returning charge controller respectively with the recirculating fluidized bed burner hearth, the external fluid-bed heat exchanger links to each other, the outlet of external fluid-bed heat exchanger links to each other with the recirculating fluidized bed burner hearth, and the bottom of recirculating fluidized bed burner hearth links to each other with ash-dregs cooler.
The present invention compared with prior art advantage is:
(1) adopts the external fluid-bed heat exchanger, utilize the returning charge controller to regulate the flow of the fly ash granule that enters the external fluid-bed heat exchanger, can realize fire box temperature control easily, overcome other boiler and improved the restive problem of rear hearth temperature in oxygen concentration.
(2) utilize gas flow regulating valve to improve concentration of oxygen in the fuel oxidizer that enters in the burner hearth, the gas-solid ratio ratio of solid particle amount (exhaust gas volumn with) obviously descends, promptly under the identical condition of coal-supplying amount, flue gas flow reduces widely, thereby make the volume and weight of boiler obviously reduce, provide cost savings.
(3) adopt the returning charge controller, improved SO in the stove 2With the time of contact of desulfurizing agent and the utilization ratio of desulfurizing agent, thereby improve desulfuration efficiency, reduced SO 2Discharging.
(4) oxygen that comes out from air separator directly enters the recirculating fluidized bed burner hearth without pre-heater, has avoided the problem that adopts pre-heater heating oxygen generation gas to leak.
(5) the present invention enters CO 2The CO of retracting device 2Concentration has reached more than 98%, can easily reclaim, and has reduced CO 2Cost recovery.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of boiler system of circulating fluid bed burning in oxygen enrichment of the present invention.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, the structure of a kind of embodiment of boiler system of circulating fluid bed burning in oxygen enrichment of the present invention is, recirculating fluidized bed burner hearth 1, downward air discharge cyclone separator 2 and afterbody convection recuperator 3 link to each other successively, afterbody convection recuperator 3, pre-heater 4, dedusting link to each other with gas cooler 6 successively with desulfurizer 5, and gas cooler 6 is by air-introduced machine 13, first gas flow regulating valve 16 and the CO 2Retracting device 7 links to each other, gas cooler 6 links to each other with pre-heater 4 by air-introduced machine 13, first gas flow regulating valve 16, second gas flow regulating valve 17, gas recirculating fan 14, gas cooler 6 links to each other with external fluid-bed heat exchanger 10 by air-introduced machine 13, first gas flow regulating valve 16, second gas flow regulating valve 17, fluidized wind pressure fan 15, more than all continuous by pipeline.Air separator 9 links to each other with recirculating fluidized bed burner hearth 1 by same pipeline with pre-heater 4, the outlet at bottom of downward air discharge cyclone separator 2 links to each other with returning charge controller 12, the outlet of returning charge controller 12 links to each other with recirculating fluidized bed burner hearth 1, external fluid-bed heat exchanger 10 respectively by two pipelines, the outlet of external fluid-bed heat exchanger 10 links to each other with recirculating fluidized bed burner hearth 1 by pipeline, and the bottom of recirculating fluidized bed burner hearth 1 links to each other with ash-dregs cooler 11.
Ash-dregs cooler 11 can be geomantic omen double-cooled type fluidized bed slag cooler; Pre-heater 4 can be pipe heat exchanger; Gas cooler 6 can be the direct contact type gas cooler; Air separator 9 can be the Cryogenic air separation device.
The present invention also can comprise N 2Retracting device 8, N 2Retracting device 8 links to each other with air separator 9.
It is the solid fuel of carbon that fuel can be selected coal or main component for use; Optional lime stone of desulfurizing agent or dolomite.
Air obtains high-concentration oxygen after air separator 9 separates, the flue gas recycled after high-concentration oxygen and process pre-heater 4 preheat mixes the oxidant that (in the gaseous mixture, concentration of oxygen is 29%-60%) acts as a fuel.Oxidant is divided into two-way and sends into recirculating fluidized bed burner hearth 1 as wind, a secondary wind respectively, and fuel in recirculating fluidized bed burner hearth 1 and desulfurizing agent burn then, and the slag that burning generates is by ash-dregs cooler 11 coolings and discharge.The ash-laden gas that burning generates (mainly is CO 2, water vapour and fly ash granule) leave recirculating fluidized bed burner hearth 1 and enter downward air discharge cyclone separator 2, in downward air discharge cyclone separator 2, most fly ash granule is separated from flue gas.The fly ash granule that separates is under the regulating action of returning charge controller 12, and a part directly turns back in the burner hearth 1, and another part returns recirculating fluidized bed burner hearth 1 again after 10 coolings of external fluid-bed heat exchanger.The flow that utilizes returning charge controller 12 to regulate the fly ash granule that enters external fluid-bed heat exchanger 10 reaches the purpose of regulating boiler load and fire box temperature.When fire box temperature is too high, increase the temperature that the flying dust amount that enters external fluid-bed heat exchanger 10 reduces burner hearth by regulating returning charge controller 12; Otherwise,, then reduce the flying dust amount that enters external fluid-bed heat exchanger 10 if fire box temperature is low excessively.Through the flue gas after 2 separation of downward air discharge cyclone separator mainly is CO 2And steam, through afterbody convection recuperator 3 and pre-heater 4 coolings, the cooling back carries out dedusting in dedusting and desulfurizer 5 and desulfurization is handled successively for they, and the gas that obtains is wet CO 2Gas, it is further cooling in gas cooler 6, is divided into three parts by air-introduced machine 13 under the effect of first gas flow regulating valve 16 and second gas flow regulating valve 17 then, and is most of at CO 2Reclaim in the retracting device 7, fraction as flue gas recycled by gas recirculating fan 14 and pre-heater 4 with separate by air separator 9 after the oxygen mix that obtains, some sends into the fluidized wind of external fluid-bed heat exchanger 10 as fly ash granule by fluidized wind pressure fan 15.
Claims (6)
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