CN103742899A - Oxygen-enriched combustion circulating fluidized bed poly-generation system and process - Google Patents
Oxygen-enriched combustion circulating fluidized bed poly-generation system and process Download PDFInfo
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- CN103742899A CN103742899A CN201410030446.9A CN201410030446A CN103742899A CN 103742899 A CN103742899 A CN 103742899A CN 201410030446 A CN201410030446 A CN 201410030446A CN 103742899 A CN103742899 A CN 103742899A
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The invention provides an oxygen-enriched combustion circulating fluidized bed poly-generation system. The oxygen-enriched combustion circulating fluidized bed poly-generation system comprises a circulating fluidized bed combustion furnace and a circulating fluidized bed gasification furnace, wherein the circulating fluidized bed combustion furnace is connected with a separator I, the separator I is connected with a flue at the tail and a two-way material control device, the two-way material control device is connected with the circulating fluidized bed combustion furnace and the circulating fluidized bed gasification furnace respectively, the circulating fluidized bed gasification furnace is connected with the circulating fluidized bed combustion furnace by a return feeder I, the circulating fluidized bed gasification furnace is connected with a ceramic dust collector and a coal gas purification system by a separator II, the flue at the tail is connected with a flue gas distribution valve by a glue gas dust-removal, desulfurization and denitration device, and an outlet of the flue gas distribution valve is divided into three paths. The invention also provides an oxygen-enriched combustion circulating fluidized bed poly-generation process. The oxygen-enriched combustion circulating fluidized bed poly-generation system has high fuel utilization rate, high coal gas yield, good tar quality, small pollutant discharge and low recycling cost, and fuel and flue gas at the tail can be utilized to the maximum extent.
Description
Technical field
The present invention relates to a kind of circulating fluid bed burning in oxygen enrichment polygenerations systeme and technique, belong to coal Poly-generation technology field.
Background technology
China is lower to the utilization ratio of existing resource at present, and especially, aspect coal fired power generation or power station heat supply, energy conversion efficiency is lower than 40%, and aspect the chemical industry such as coking, oil refining, the utilization ratio of coal is relatively high, can reach 85%～90%.Clean and effective utilizes coal resources, advances coal Poly-generation to become one of primary study direction of national strategy.Coal Poly-generation technology refers to the organic integration that is transformed, utilized technology by multiple coal, obtain multiple clean secondary energy sources, such as electricity, liquid fuel, the chemical by-product of gaseous fuel and multiple high added value, realizes that coal utilization is the most efficient, minimum pollution.Evidence, power industry adopts polygenerations systeme, and generating efficiency can improve approximately 10%, and cost declines 30%, and polygenerations systeme also makes the production cost of chemical products significantly reduce simultaneously.
Chinese invention patent 200610154581.X provides a kind of circulating fluidized bed heat-power-gas-tar multi-joint-production apparatus and method thereof, fluid-bed combustion furnace, fluidized bed dry distillation stove, high-temperature separator, material returning device and corresponding auxiliary device, consist of, product is mainly coal gas and tar.Fluidized bed dry distillation stove adopts recirculation coal gas or steam as fluidizing gas, in gas retort, temperature is on the low side, only there is the pyrolytic reaction of coal, in gas retort, there is not any reaction and be just admitted in combustion furnace and burn in most coke, gas yield is very low, and part coal gas is used as fluidizing gas again, gas yield is lower; The tar yield that fluidized bed dry distillation stove produces is higher, but tar is very difficult Fen Li with dust, and tar product dust burdening is difficult to greatly realize commercial Application.
Summary of the invention
It is high that the technical problem to be solved in the present invention is to provide a kind of gas yield, and tail flue gas can recycling, and circulating fluid bed burning in oxygen enrichment polygenerations systeme and technique that pollutant emission is low really realize the most efficient, minimum pollution of fuel utilization.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide a kind of circulating fluid bed burning in oxygen enrichment polygenerations systeme, it is characterized in that: comprise CFBC stove and circle fluidized-bed gasification furnace, CFBC stove top is connected with a separator, No. one separator top is connected with back-end ductwork, No. one separator bottom is connected with two-way material controlling device, two-way material controlling device is connected with CFBC stove and circle fluidized-bed gasification furnace respectively, circle fluidized-bed gasification furnace is connected with CFBC stove by a material returning device, circle fluidized-bed gasification furnace top is connected with No. two separators, No. two separator bottom is connected with circle fluidized-bed gasification furnace by No. two material returning devices, No. two separator top is connected with Ceramic dust collector, Ceramic dust collector connects gas cleaning system, gas cleaning system is connected with air accumulator with tar pool respectively, back-end ductwork is connected with flue gas distributing valve by after the out of stock device of flue-gas dust-removing and desulfurization, the outlet of flue gas distributing valve is divided into three tunnels, the first via is connected with flue gas oxygen mix device, the second tunnel is connected with circle fluidized-bed gasification furnace, Third Road is connected with flue gas recovery device, air separator is connected with nitrogen gas recovering apparatus with flue gas oxygen mix device, and flue gas oxygen mix device bottom is connected with CFBC stove.
The present invention also provides a kind of circulating fluid bed burning in oxygen enrichment multi-production process, adopt above-mentioned circulating fluid bed burning in oxygen enrichment polygenerations systeme, it is characterized in that: air obtains nitrogen and oxygen after air separator separates, nitrogen reclaims by nitrogen gas recovering apparatus, oxygen evenly mixes in flue gas oxygen mix device with the circulating flue gas of oxygen-enriched combusting, flue gas oxygen mixture is divided into two-way respectively as a wind, Secondary Air is sent into CFBC stove, a wind, Secondary Air burns with together with fuel in sending into CFBC stove as oxidant and fluidized wind, the lime-ash that burning generates is discharged at CFBC furnace bottom, the flue gas that burning generates enters separator No. one, most recycle stock is separated and enters two-way material controlling device by a separator, under the regulating action of two-way material controlling device, a part is returned to CFBC stove, another part enters circle fluidized-bed gasification furnace, the high-temperature material that enters gasification furnace provides the gasification of circle fluidized-bed gasification furnace fuel and the needed heat of pyrolytic reaction, by two-way material controlling device, control the high-temperature material amount that enters in circle fluidized-bed gasification furnace and then the temperature of controlled circulation fluidized-bed gasification furnace, in circle fluidized-bed gasification furnace, reacted semicoke mixtures of materials is sent into after-flame in CFBC stove through a material returning device, circle fluidized-bed gasification furnace top untreated coal gas out enters separator No. two, and the thin ash being separated by No. two separators returns to circle fluidized-bed gasification furnace by No. two material returning devices, the coal gas that go out on No. two separator top first passes through Ceramic dust collector, then through dedusting in gas cleaning system, dewater, cooling, after separating carbon dioxide, tar is reclaimed by tar pool, after purifying, coal gas enters air accumulator, the flue gas that enters back-end ductwork from separator top is after the out of stock device of flue-gas dust-removing and desulfurization, main component is carbon dioxide and steam, and the flue gas after purification is divided into three parts under the effect of flow control valve: the circulating flue gas that Part I is oxygen-enriched combusting is sent into CFBC stove as wind, a Secondary Air after entering flue gas oxygen mix device and oxygen mix, Part II is that circulating flue gas passes into circle fluidized-bed gasification furnace, for circle fluidized-bed gasification furnace provides the needed gas of gasification reaction and fluidized wind, Part III is that recovered flue gas reclaims by flue gas recovery device, two-way material controlling device fluidized wind, a material returning device fluidized wind, No. two material returning device fluidized winds all utilize the high-temperature flue gas after purification.
Preferably, described CFBC stove running temperature is 900 ℃～1200 ℃, and described circle fluidized-bed gasification furnace running temperature is 700 ℃～900 ℃.
Preferably, after described purification coal gas part as the fluidizing gas of described circle fluidized-bed gasification furnace.
Preferably, the fuel in described CFBC stove and the fuel in described circle fluidized-bed gasification furnace are that coal, living beings or main component are the solid fuel of carbon.
Circulating fluid bed burning in oxygen enrichment polygenerations systeme provided by the invention compared with prior art, has following technique effect:
Existing recirculating fluidized bed polygenerations systeme combustion furnace adopts air burning, in the tail flue gas producing, the content of nitrogen is very large, if adopt flue gas as gasification furnace fluidizing gas, the synthesis gas main component producing through gasification reaction is nitrogen, gas content is very low, if minority coal gas is separated from synthesis gas, efficiency is very low, economical very poor, therefore can only adopt recirculation coal gas or steam as fluidizing gas, in gasification furnace, only there is like this pyrolytic reaction of coal, in gas retort, there is not any reaction and be just admitted in combustion furnace and burn in most coke, gas yield is very low, and part coal gas is again as fluidizing gas, gas yield is lower, do not realize the efficient utilization of coal, and combustion furnace tail flue gas discharge capacity is very large.
In the present invention, CFBC stove adopts oxygen-enriched combusting, in tail flue gas after treatment, main component is account for greatly 95% carbon dioxide and account for greatly 5% steam, such flue gas can be used as the fluidizing gas of gasification furnace, the present invention has improved gasifier operation temperature, fuel in gasification furnace except normal pyrolytic reaction, due to coke can also and fluidizing gas in carbon dioxide reaction generate carbon monoxide, carbon monoxide is one of main component of coal gas, the coal gas amount that gasification furnace produces like this will significantly raise, the utilization ratio of fuel raises, the partial fume that can not be utilized is because gas concentration lwevel is very high, be easy to reclaim, cost recovery is very low.
The present invention is owing to having improved the reaction temperature in gasification furnace, the gas temperature exporting at gasification furnace is far above tar Precipitation Temperature, at this moment coal gas is passed through to cyclone separator, Ceramic dust collector carries out slightly, thin two-stage ash disposal, the burnt oil and gas dust burdening reclaiming is like this few, can reach commercial Application and civilian requirement.
Circulating fluid bed burning in oxygen enrichment polygenerations systeme provided by the invention and technique have overcome the deficiencies in the prior art, and the utilization ratio of fuel is high, and gas yield is high, and quality of coke tar is good, and fuel and tail flue gas utilize to greatest extent, and pollutant emission is few, and cost recovery is low.
Accompanying drawing explanation
Fig. 1 is circulating fluid bed burning in oxygen enrichment polygenerations systeme schematic diagram provided by the invention.
The specific embodiment
For the present invention is become apparent, hereby with a preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Fig. 1 is circulating fluid bed burning in oxygen enrichment polygenerations systeme schematic diagram provided by the invention, described circulating fluid bed burning in oxygen enrichment polygenerations systeme comprises CFBC stove 1 and circle fluidized-bed gasification furnace 2, CFBC stove 1 top is connected with a separator 3, No. one separator 3 tops are connected with back-end ductwork 13, No. one separator 3 bottoms are connected with two-way material controlling device 4, two-way material controlling device 4 is connected with CFBC stove 1 and circle fluidized-bed gasification furnace 2 respectively, circle fluidized-bed gasification furnace 2 is connected with CFBC stove 1 by a material returning device 5, circle fluidized-bed gasification furnace 2 tops are connected with No. two separators 6, No. two separator 6 bottoms are connected with circle fluidized-bed gasification furnace 2 by No. two material returning devices 7, No. two separator 6 tops are connected with Ceramic dust collector 18, Ceramic dust collector 18 connects gas cleaning system 8, gas cleaning system 8 is connected with air accumulator 17 with tar pool 16 respectively.Back-end ductwork 13 is connected with flue gas distributing valve 14 by after the out of stock device 11 of flue-gas dust-removing and desulfurization, 14 outlets of flue gas distributing valve are divided into three tunnels, the first via is connected with flue gas oxygen mix device 10, the second tunnel is connected with circle fluidized-bed gasification furnace 2, Third Road is connected with flue gas recovery device 15, air separator 9 is connected with nitrogen gas recovering apparatus 12 with flue gas oxygen mix device 10, and flue gas oxygen mix device 10 bottoms are connected with CFBC stove 1.
The operation of circulating fluid bed burning in oxygen enrichment polygenerations systeme provided by the invention is as follows: air A obtains nitrogen B and oxygen C after air separator 9 separates, nitrogen B reclaims by nitrogen gas recovering apparatus 12, oxygen C with the circulating flue gas Q of oxygen-enriched combusting in interior even mixing of flue gas oxygen mix device 10, flue gas oxygen mixture D is divided into two-way respectively as a wind E, Secondary Air F sends into CFBC stove 1, a wind E, Secondary Air F burns with together with fuel T in sending into CFBC stove 1 as oxidant and fluidized wind, the lime-ash V that burning generates discharges in CFBC stove 1 bottom, (main component is carbon dioxide to the flue gas G that burning generates, steam, recycle stock) enter separator 3 No. one, most recycle stock is separated and enters two-way material controlling device 4 by a separator 3, under the regulating action of two-way material controlling device 4, a part is returned to CFBC stove 1, another part enters circle fluidized-bed gasification furnace 2, the high-temperature material J that enters gasification furnace provides circle fluidized-bed gasification furnace 2 fuel U gasification and the needed heats of pyrolytic reaction.By two-way material controlling device 4, control the high-temperature material amount that enters in circle fluidized-bed gasification furnace 2 and then the temperature of controlled circulation fluidized-bed gasification furnace 2.The interior reacted semicoke mixtures of materials N of circle fluidized-bed gasification furnace 2 sends into the interior after-flame of CFBC stove 1 through a material returning device 5.Circle fluidized-bed gasification furnace 2 tops untreated coal gas L out enters separator 6 No. two, and the thin grey M being separated by No. two separators 6 returns to circle fluidized-bed gasification furnace 2 by No. two material returning devices 7.The coal gas that go out on No. two separator 6 tops first passes through Ceramic dust collector 18, again through gas cleaning system 8 interior dedusting, dewater, cooling, after separating carbon dioxide, tar P is reclaimed by tar pool 16, after purifying, coal gas O enters air accumulator 17, the tar P reclaiming is with purification coal gas O output for industry and civilian, and if needed, the coal gas after purification also can partly be used as the fluidizing gas of gasification furnace 2.The flue gas that enters back-end ductwork 13 from separator 3 top is after the out of stock device 11 of flue-gas dust-removing and desulfurization, main component is carbon dioxide and steam, flue gas H after purification is divided into three parts under the effect of flow control valve 14: the circulating flue gas Q that Part I is oxygen-enriched combusting enters flue gas oxygen mix device 10 mix with oxygen C after as a wind E, Secondary Air F sends into CFBC stove 1, Part II is that circulating flue gas passes into circle fluidized-bed gasification furnace 2, for circle fluidized-bed gasification furnace 2 provides the needed gas of gasification reaction and fluidized wind, Part III is that recovered flue gas S reclaims by flue gas recovery device 15.Two-way material controlling device 4 fluidized wind W, material returning device 5 fluidized wind X, No. two material returning device 7 fluidized wind Y all utilize the high-temperature flue gas after purification.CFBC stove fuel T and gasification furnace fuel U are that coal, living beings or main component are the solid fuel of carbon.
Claims (5)
1. a circulating fluid bed burning in oxygen enrichment polygenerations systeme, it is characterized in that: comprise CFBC stove (1) and circle fluidized-bed gasification furnace (2), CFBC stove (1) top is connected with a separator (3), a separator (3) top is connected with back-end ductwork (13), a separator (3) bottom is connected with two-way material controlling device (4), two-way material controlling device (4) is connected with CFBC stove (1) and circle fluidized-bed gasification furnace (2) respectively, circle fluidized-bed gasification furnace (2) is connected with CFBC stove (1) by a material returning device (5), circle fluidized-bed gasification furnace (2) top is connected with No. two separators (6), No. two separators (6) bottom is connected with circle fluidized-bed gasification furnace (2) by No. two material returning devices (7), No. two separators (6) top is connected with Ceramic dust collector (18), Ceramic dust collector (18) connects gas cleaning system (8), gas cleaning system (8) is connected with air accumulator (17) with tar pool (16) respectively, back-end ductwork (13) is connected with flue gas distributing valve (14) by after the out of stock device of flue-gas dust-removing and desulfurization (11), flue gas distributing valve (14) outlet is divided into three tunnels, the first via is connected with flue gas oxygen mix device (10), the second tunnel is connected with circle fluidized-bed gasification furnace (2), Third Road is connected with flue gas recovery device (15), air separator (9) is connected with nitrogen gas recovering apparatus (12) with flue gas oxygen mix device (10), flue gas oxygen mix device (10) bottom is connected with CFBC stove (1).
2. a circulating fluid bed burning in oxygen enrichment multi-production process, adopt circulating fluid bed burning in oxygen enrichment polygenerations systeme as claimed in claim 1, it is characterized in that: air (A) obtains nitrogen (B) and oxygen (C) after air separator (9) separates, nitrogen (B) reclaims by nitrogen gas recovering apparatus (12), oxygen (C) evenly mixes in flue gas oxygen mix device (10) with the circulating flue gas (Q) of oxygen-enriched combusting, flue gas oxygen mixture (D) is divided into two-way respectively as a wind (E), Secondary Air (F) is sent into CFBC stove (1), a wind (E), Secondary Air (F) is as oxidant and fluidized wind and burning together with fuel (T) in sending into CFBC stove (1), the lime-ash (V) that burning generates is discharged in CFBC stove (1) bottom, the flue gas (G) that burning generates enters a separator (3), most recycle stock is separated and enters two-way material controlling device (4) by a separator (3), under the regulating action of two-way material controlling device (4), a part is returned to CFBC stove (1), another part enters circle fluidized-bed gasification furnace (2), the high-temperature material (J) that enters gasification furnace provides circle fluidized-bed gasification furnace (2) fuel (U) gasification and the needed heat of pyrolytic reaction, by two-way material controlling device (4), control and enter the interior high-temperature material amount of circle fluidized-bed gasification furnace (2) and then the temperature of controlled circulation fluidized-bed gasification furnace (2), in circle fluidized-bed gasification furnace (2), reacted semicoke mixtures of materials (N) is sent into the interior after-flame of CFBC stove (1) through a material returning device (5), circle fluidized-bed gasification furnace (2) top untreated coal gas (L) out enters No. two separators (6), the thin ash (M) being separated by No. two separators (6) returns to circle fluidized-bed gasification furnace (2) by No. two material returning devices (7), the coal gas that go out on No. two separators (6) top first passes through Ceramic dust collector (18), pass through again the interior dedusting of gas cleaning system (8), dewater, cooling, after separating carbon dioxide, tar (P) is reclaimed by tar pool (16), and after purifying, coal gas (O) enters air accumulator (17), the flue gas that enters back-end ductwork (13) from a separator (3) top is after the out of stock device of flue-gas dust-removing and desulfurization (11), main component is carbon dioxide and steam, and the flue gas (H) after purification is divided into three parts under the effect of flow control valve (14): the circulating flue gas (Q) that Part I is oxygen-enriched combusting enters after flue gas oxygen mix device (10) mixes with oxygen (C) and sends into CFBC stove (1) as a wind (E), Secondary Air (F), Part II is that circulating flue gas passes into circle fluidized-bed gasification furnace (2), for circle fluidized-bed gasification furnace (2) provides the needed gas of gasification reaction and fluidized wind, Part III is that recovered flue gas (S) reclaims by flue gas recovery device (15), two-way material controlling device fluidized wind (W), a material returning device fluidized wind (X), No. two material returning device fluidized winds (Y) all utilize the high-temperature flue gas after purifying.
3. a kind of circulating fluid bed burning in oxygen enrichment multi-production process as claimed in claim 2, is characterized in that: described CFBC stove running temperature is 900 ℃～1200 ℃, and described circle fluidized-bed gasification furnace running temperature is 700 ℃～900 ℃.
4. a kind of circulating fluid bed burning in oxygen enrichment multi-production process as claimed in claim 2, is characterized in that: coal gas after described purification (O) part is as the fluidizing gas of described circle fluidized-bed gasification furnace (2).
5. a kind of circulating fluid bed burning in oxygen enrichment multi-production process as claimed in claim 2, is characterized in that: the fuel (U) in fuel (T) and described circle fluidized-bed gasification furnace in described CFBC stove is the solid fuel that coal, living beings or main component are carbon.
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| CN104263419A (en) * | 2014-09-26 | 2015-01-07 | 山西潞安环保能源开发股份有限公司 | Coal pyrolysis and gasification polygeneration process based on circulating fluidized bed and coal pyrolysis and gasification polygeneration system based on circulating fluidized bed |
| CN104629808A (en) * | 2015-01-16 | 2015-05-20 | 华中科技大学 | System for producing biomass high-heating-value gasified gases by using low temperature flue gas of oxygen-enriched combustion boiler |
| CN104629809A (en) * | 2015-01-04 | 2015-05-20 | 华中科技大学 | System for preparing high-caloric-value biomass gasified gas by using high-temperature flue gas of oxygen-enriched combustion boiler |
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