CN200958098Y - Double-fluidized bed gasifying-burning coupler for producing high-concentration synthetic gas by solid fuel - Google Patents

Abstract

The utility model discloses a double fluidized bed(4) gasify flame coupling device for the solid fuel to prepare high concentration synthesis gas, which is composed of a fluidized bed, a synthesis gas outlet(5), a fuel inlet(3), a steam inlet(1) and a gas distributor(2). The utility model is characterized in that the fluidized bed is divided into a main fluidized bed(4) and an assisting fluidized bed made up by a straight pipe(9) and the expanding section(7) of the strait pipe(9), the top of the expanding section (7) is the smoke outlet(6), the bottom of the straight pipe is a clinker outlet(14), a first wind inlet(13) and a second wind inlet(11) are provided at the bottom of the straight pipe(9), and are connected with the main fluidized bed(4) fluidized bed(4) through the circle slanting pipe (12) at the bottom of the straight pipe(9), the expanding section(7) is connected with the middle of the main fluidized bed(4) through a vertical pipe(8) and a L form valve(10), the top of the main fluidized bed(4) is the synthesis gas outlet(5), the steam inlet(1) and a gas distributor(2) are provided at the bottom of the main fluidized bed(4), the fuel inlet(3) is provided in the middle of the main fluidized bed(4). The utility model provides the advantages of a simple structure, a low cost and an easy operation.

Description

Solid fuel prepares the double-fluidized-bed gasification-burning coupling device of high density synthetic gas

Technical field

The utility model belongs to a kind of gasification-combustion unit, relates in particular to double-fluidized-bed gasification-burning coupling device that a kind of solid fuel prepares the high density synthetic gas.

Background technology

Coal is the leading energy of China, accounts for more than 75% in primary energy source consumption at present.Along with the adjustment of energy structure, although the coal proportion descends to some extent, the total amount of coal consumption but presents cumulative year after year trend, and visible clean coal conversion technology has extremely important strategic importance to the stable sound development of national economy.Oil is an another kind of important energy source in China's economic construction, and along with the heaviness and the poor qualityization of crude oil, the output of refinery coke presents ascendant trend year by year, and therefore, the efficient utilization of refinery coke is directly connected to the economic benefit and the social benefit of refinery.Clean discharging is zero renewable energy source to biomass as a kind of carbonic acid gas, has caused the common concern of international community.Specifically, biomass resource comprises resource (as: sugarcane, cassava, corn, Semen Brassicae campestris, sweet sorghum, You Nan, manioca and energy forest equal energy source crop) that plantation is produced and the resource (as: agricultural residues such as stalk, rice husk, bagasse, vegetables resistates, wood working waste that do not utilize, animal debris things such as feces of livestock and poultry, slaughterhouse waste, urban waste such as fishery residual processing thing and domestic refuse, organic waste water) two big classes.No matter be renewable energy sources such as fossil energies such as coal and refinery coke, or biomass, all belong to the solid fuel that contains carbon, protium.

To make synthetic gas after the solid fuel gasifications such as coal, refinery coke, biomass, can after transforming, can obtain clean fuel hydrogen on the other hand for carbonizers such as synthin, alcohols and ethers supply raw materials on the one hand.Existing business-like vapourizing furnace mainly contains fixed bed (moving-bed), fluidized-bed and air flow bed three major types type, and wherein fluidized-bed gasification has plurality of advantages such as the moderate and coal suitability of temperature is wide.Chinese patent (ZL 200410051078.2 and ZL03262731.9) is though proposed the new technology of biomass and fluidized bed gasification respectively, but be single fluidized bed device, its defective is that can only to adopt air, oxygen-rich air, oxygen, water vapor and composition thereof be vaporized chemical, in order to obtain the higher synthetic gas of purity, perhaps the upstream needs air separation facility or the follow-up nitrogen separation device of needs, facility investment, device operation and maintenance cost great number thereof.

Summary of the invention

The purpose of this utility model provides a kind of simple in structure, cost is low, easy-operating solid fuel prepares the high density synthetic gas double-fluidized-bed gasification-burning coupling device.

The purpose of this utility model is to realize like this, it is by fluidized-bed, syngas outlet, fuel inlet, steam entry and gas distributor are formed, it is characterized in that fluidized-bed is divided into main fluidized-bed and secondary fluidized-bed, the expanding reach that straight tube is connected with the straight tube top is formed secondary fluidized-bed, the expanding reach top is an exhanst gas outlet, the straight tube bottom is the lime-ash outlet, the straight tube bottom is wind inlet and secondary air import once, and communicate with the main fluidized-bed bottom by the circulation inclined tube in the straight tube bottom, expanding reach communicates with the main fluidized-bed middle part by standpipe and L type valve, the main fluidized-bed top is a syngas outlet, steam entry and gas distributor are arranged at the main fluidized-bed bottom, at the main fluidized-bed middle part fuel inlet are arranged.

Described main fluidized-bed is a pyramidal structure.

Solid fuel is conveyed into main fluidized-bed, and water vapor enters the main flow bed through steam entry and gas distributor, presents bubbling or turbulence fluidization in the main fluidized-bed.Solid fuel is under the effect of water vapor, coal and biomass generation pyrolysis and gasification reaction, synthetic gas is discharged from the main fluidized-bed syngas outlet, pyrolysis, residue after the gasification (is called semicoke here, for biomass, comprise semicoke and quartz sand inert support) enter the straight tube of secondary fluidized-bed through the circulation inclined tube, in the circulation inclined tube, solid materials presents the moving-bed state, import enters straight tube and contacts with semicoke air with secondary air by blast inlet, combustion reactions takes place, owing to the very high fast bed state that presents of gas velocity in the straight tube, flue gas and solid particulate are in the expanding reach of secondary fluidized-bed after the initial gross separation, flue gas flows out from exhanst gas outlet, and high-temperature solid particle turns back to main fluidized-bed through standpipe and L type valve, and lime-ash is discharged through the outlet of ash discharge slag.

The utility model compared with prior art has the following advantages:

1. by the recycle system pyrolysis/gasification reaction of heat absorption and the combustion reactions of heat release are finished in same device, under the condition of instead of enriched oxygen air or oxygen, can be obtained highly purified synthetic gas, realized the integrated reasonable coordination with energy of height of devices;

2. solid-fuelled pyrolysis/gasification and combustion processes are carried out in two fluidized-beds respectively, can realize controlling respectively;

3. main fluidized-bed adopts pyramidal structure, and the flowing of pyrolysis, gasification, transmission and reaction were strengthened, and can prevent also in the secondary fluidized-bed that gas falls string through the circulation inclined tube and enters in the main fluidized-bed;

4. secondary fluidized-bed adopts the fast bed form, can improve efficiency of combustion to greatest extent;

5. expanding reach is adopted on secondary fluidized-bed top, helps gas, the solid separation;

6. the standpipe bottom connects L type valve, has guaranteed that solid materials turns back to main fluidized-bed smoothly.

Description of drawings

Fig. 1 is a structural representation of the present utility model

As shown in the figure, the 1st, steam entry, the 2nd, gas distributor, the 3rd, fuel inlet, the 4th, main fluidized-bed, the 5th, syngas outlet, the 6th, exhanst gas outlet, the 7th, expanding reach, the 8th, standpipe, the 9th, straight tube, the 10th, L type valve, the 11st, secondary air inlet, the 12nd, circulation inclined tube, 13 is wind inlets, the 14th, and the lime-ash outlet.

Embodiment

Fluidized-bed is divided into main fluidized-bed 4 and secondary fluidized-bed, the expanding reach 7 that straight tube 9 is connected with straight tube 9 tops is formed secondary fluidized-bed, expanding reach 7 tops are exhanst gas outlets 6, straight tube 9 bottoms are lime-ash outlets 14, straight tube 9 bottoms are wind inlet 13 and secondary air import 11 once, and communicate with main fluidized-bed 4 bottoms by circulation inclined tube 12 in straight tube 9 bottoms, expanding reach 7 communicates with main fluidized-bed 4 middle parts by standpipe 8 and L type valve 10, main fluidized-bed 4 tops are syngas outlet 5, steam entry 1 and gas distributor 2 are arranged at main fluidized-bed 4 bottoms, at main fluidized-bed 4 middle parts fuel inlet 3 are arranged.

Solid fuel is conveyed into main fluidized-bed 4 by fuel inlet 3, water vapor enters main flow bed 4 through steam entry 1 and gas distributor 2, solid fuel is under the effect of water vapor, present bubbling or turbulence fluidization in the main fluidized-bed 4, coal and biomass generation pyrolysis and gasification reaction, synthetic gas is discharged from main fluidized-bed 4 syngas outlet 5, pyrolysis, residue after the gasification (is called semicoke here, for biomass, comprise semicoke and quartz sand inert support) enter the straight tube 9 of secondary fluidized-bed through circulation inclined tube 12, in circulation inclined tube 9, solid materials presents the moving-bed state, air enters straight tube 9 by a blast inlet 13 with secondary air import 11 and contacts with semicoke, combustion reactions takes place, owing to the very high fast bed state that presents of gas velocity in the straight tube 9, after the initial gross separation, flue gas flows out from exhanst gas outlet 6 in the expanding reach 7 of secondary fluidized-bed for flue gas and solid particulate, high-temperature solid particle turns back to main fluidized-bed 4 through standpipe 8 and L type valve 10, and lime-ash is discharged through ash discharge slag outlet 14.

Claims (2)

1, double-fluidized-bed gasification-burning coupling device that a kind of solid fuel prepares the high density synthetic gas is by fluidized-bed, syngas outlet (5), fuel inlet (3), steam entry (1) and gas distributor (2) are formed, it is characterized in that fluidized-bed is divided into main fluidized-bed (4) and secondary fluidized-bed, straight tube (9) is formed secondary fluidized-bed with the expanding reach (7) that straight tube (9) top is connected, expanding reach (7) top is exhanst gas outlet (6), straight tube (9) bottom is lime-ash outlet (14), straight tube (9) bottom is wind inlet (13) and secondary air import (11) once, and communicate with main fluidized-bed (4) bottom by circulation Dou pipe (12) in straight tube (9) bottom, expanding reach (7) communicates with main fluidized-bed (4) middle part by standpipe (8) and L type valve (10), main fluidized-bed (4) top is syngas outlet (5), steam entry (1) and gas distributor (2) are arranged at main fluidized-bed (4) bottom, at main fluidized-bed (4) middle part fuel inlet (3) are arranged.

2, a kind of solid fuel as claimed in claim 1 prepares the double-fluidized-bed gasification-burning coupling device of high density synthetic gas, it is characterized in that described main fluidized-bed is a pyramidal structure.

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