A kind ofly be used for the airflow bed gasification furnace that the variform raw material gasifies altogether
Technical field
The present invention relates to a kind of airflow bed gasification furnace that is applicable to that the variform raw material gasifies altogether.
Background technology
Along with social progress, fossil energy is shortage day by day.At present one of the hot research direction in energy research field is by gasification technology, with fossil energy, and for example coal, oil (residual oil, pitch, refinery coke etc.), Sweet natural gas (containing oil field gas, coal-seam gas); Biomass energy, for example stalk, timber etc.; The waste energy, for example domestic refuse, mud, ight soil, tire etc.; Industrial gaseous waste, for example coke(oven)gas, refinery gas, blast furnace gas etc. are processed as synthetic gas, the high-efficiency cleaning of realizing gasified raw material transforms, be chemical fertilizer (ammonia, urea), methyl alcohol, dme, automotive fuel again with the synthetic gas deep processing, or continuation is society's urgent need commodity such as alkene (MTO, MTP) with the methyl alcohol deep processing.
Entrained flow bed gasification technology is the most representative gasification technology now.The key element that forms the airflow bed gasification furnace characteristic is as follows: the configuration and the structure of nozzle (technology nozzle, baker intensification nozzle); Side towards the fire refractory liner or be water wall or for refractory brick; The structure of vaporizer and size; The cooling and purifying mode of crude synthesis gas (Quench or recovery of heat); The structure of cooling and purifying chamber and size.
Representational in the world at present airflow bed gasification furnace has: multi-nozzle opposed type vapourizing furnace, and the opposed formation collision jet of multi-nozzle, side towards the fire is a refractory brick, the high temperature crude synthesis gas adopts the Quench scheme; Texaco(Texaco) stove is the single nozzle setting, is configured in furnace roof, and side towards the fire is a refractory brick, and the high temperature crude synthesis gas adopts the Quench scheme; The Shell(shell) stove is four nozzles or six nozzle arrangement, forms eddy flow in the burner hearth, and side towards the fire is a water wall, adopts and returns coal gas Quench and indirect heat exchange mode cooling down high-temperature synthetic gas.
And the present airflow bed gasification furnace of commercial applications all only is applicable to the gasification of single fixedly raw material.Owner and technology decision-making person always do one's utmost to seek to support the cheap gasified raw material of utilization, gasified raw material (gaseous state, liquid state or solid-state) if any multiple different shape, or for the purpose of protection environment, people just expect that a kind of technology can change another kind of gasified raw material into by a kind of gasified raw material neatly under the constant condition of vapourizing furnace; Or realize that plurality of raw materials gasifies altogether, be suitable for regulating the hydrogen-carbon ratio in the synthetic gas especially.
Summary of the invention
Through the effort in surplus 20 years, the contriver carried out big quantity research (laboratory stage, pilot scale, demonstration unit), and conclusion is to solve the problems referred to above by the improvement that changes two approach of nozzle arrangements and gasifying furnace nozzle configuration.Concrete scheme is as follows:
A kind ofly be used for the airflow bed gasification furnace that the variform raw material gasifies altogether, in an isodiametric pressure shell, top is vaporizer 1, and the bottom is cooling washing chamber 2; When adopting single nozzle arrangement, nozzle 3 places nozzle box 10, and nozzle box 10 is positioned on the medullary ray of vaporizer 1 and is fixed in housing 4; When adopting the multi-nozzle configuration, even numbers of nozzles 6 places nozzle box's 11 while nozzle 3 to place nozzle box 10, the number of nozzle 6 is 2~8, nozzle box 11 is distributed in the periphery of housing 4, nozzle 6 is on same horizontal plane, the axis of its axis and vaporizer 1 is perpendicular, and nozzle box 11 is fixed in housing 4; A pair of nozzle on the nozzle 6 place planar radials is at a distance of 180 °, and vapourizing furnace forms percussion flow (opposed multi-nozzle) and cross jet (overhead single nozzle) in vapourizing furnace.
The material of the side towards the fire lining 5 of described vaporizer 1 is refractory brick or water wall.
Described cooling washing chamber 2 is made up of the uniform ring 7 of cooling washing water, crude synthesis gas conduit 9 and foam-breaking strip 8.
The structure of described nozzle 3 and nozzle 6 is that hyperchannel is telescopic, is that the tapered pre-membrane type of exit end mixes outward, the airflow atomizing nozzle, and cone angle a is 0~120 °.
The operating pressure of described vapourizing furnace is 0.1~12MPa, and gasification temperature is 1300~1700 ℃.
Described gasified raw material is fossil energy, biomass energy, the waste energy or industrial gaseous waste.
Described fossil energy is coal, oil (residual oil, pitch, refinery coke etc.) or Sweet natural gas (containing oil field gas, coal-seam gas); Described biomass energy is stalk or timber etc.; The described waste energy is domestic refuse, mud, ight soil or tire etc.; Described industrial gaseous waste is one or more in coke(oven)gas, refinery gas and the blast furnace gas etc.
The charging form of described gasified raw material is gaseous state, liquid state or solid-state.
The present invention adopts mixed, the pre-membrane type nozzle of airflow atomizing of cover tubular hyperchannel outward, exit end is tapered, dissimilar gasified raw material (gaseous state, liquid state or solid-state) and vaporized chemical enter a certain optimal channel alone, the delivery nozzle end forms certain speed and the jet angled with axis, and the raw material of multithread thigh (containing vaporized chemical) clashes into the uniform mixing of realizing oxygenant (pure oxygen or air or water vapour) and gasified raw material mutually.Only the raw material that need will be to be gasified feeds a certain passage, and its spouting velocity is decided on the raw material form, and the logistics speed of general operation attitude delivery nozzle outlet end is between 1~140m/s.
But this technology nozzle double as baker intensification nozzle, gasification system does not need to be provided with separately baker intensification unit.The gasified raw material easy switching of nozzle simultaneously, if a certain gasified raw material finishes using or the supply problem occurs temporarily, but this gasified raw material passage of shut-off nozzle only needs to feed protection gas (N at this gasified raw material passage
2, CO
2, water vapor etc.) with the protection nozzle.
For more small-sized vapourizing furnace, be equivalent to day 50~1000 tons of coals of processing, adopt overhead single nozzle scheme.
For large-scale vapourizing furnace, its daily handling ability is equivalent to 1000~6000 tons of coals, adopts the multi-nozzle scheme.Vapourizing furnace is by percussion flow (opposed multi-nozzle) and cross jet (overhead single nozzle), strengthens between the raw material, mixing between raw material and the vaporized chemical (oxygen, steam), realizes burning and gasification reaction.
This vapourizing furnace has extremely strong handiness, and load regulation range is big, the raw material easy switching, and the raw material availability height can reach more than 98%, than oxygen consumption, lower than raw material consumption.
Vaporizer side towards the fire lining has two kinds on refractory brick (hot wall type) and water wall (cold-wall type), the patent that the contriver has authorized has ZL98110616.1,200410067212.8(China Patent No.), will preferentially select one of them according to actual state among the present invention.
The bottom of vaporizer is multiple-hearth cooling washing chamber, patent ZL01112880.1, the ZL01112702.3(China Patent No. that can adopt the contriver to authorize) in scheme.
Description of drawings
Fig. 1 is the synoptic diagram of the airflow bed gasification furnace that gasifies altogether of the polymorphic raw material of being applicable to of the application;
Fig. 2 is the structural representation of multi-channel nozzle.
Nomenclature
1: vaporizer; 2: the cooling washing chamber; 3,6: nozzle; 4: housing (being generally metal material); 5: refractory liner; 7: the uniform ring of cooling washing water; 8: foam-breaking strip; 9: the crude synthesis gas conduit; 10,11: the nozzle box; 12,13,14: metal sleeve; 15,16,17: raw material or oxygen (vaporized chemical) passage; A: cone angle.
Embodiment
Referring to Fig. 1, be applicable to airflow bed gasification furnace that gas-liquid Guyuan material gasifies altogether in an isodiametric pressure shell, top is vaporizer 1, the bottom is cooling washing chamber 2.The side towards the fire lining 5 of vaporizer 1 is refractory brick or water wall.As adopt single nozzle arrangement, and then nozzle 3 places nozzle box 10, and nozzle box 10 is positioned on the vaporizer medullary ray, is fixed in housing 4; As adopt multi-nozzle to dispose, be opposed to nozzle and the configuration of overhead nozzles combine, nozzle 6 places nozzle box's 11 while nozzle 3 to place nozzle box 10, nozzle box 11 is distributed in the periphery of housing 4, nozzle 6 is on same horizontal plane, the axis of its axis and vaporizer 1 is perpendicular, and nozzle box 11 is fixed in housing 4.During the multi-nozzle configuration, the number that should guarantee nozzle 6 is even number (2 ~ 8), and a pair of nozzle on the nozzle 6 place planar radials is at a distance of 180 °, and vapourizing furnace forms percussion flow (opposed multi-nozzle) and cross jet (overhead single nozzle) in vapourizing furnace.Cooling washing chamber 2 is made up of the uniform ring 7 of cooling washing water, crude synthesis gas conduit 9 and foam-breaking strip 8.Single nozzle arrangement is applicable to more small-sized vapourizing furnace (being equivalent to day 50~1000 tons of coals of processing), and the multi-nozzle configuration is applicable to relatively large vapourizing furnace (being equivalent to day 1000~6000 tons of coals of processing).
Referring to Fig. 2, the structure of nozzle 3 and nozzle 6 is one telescopic, and the tapered pre-membrane type of exit end mixes outward, the airflow atomizing nozzle.Cone angle is 0~120 °.Dissimilar gasified raw material (gaseous state, liquid state or solid-state) enters a certain optimal channel alone, and the delivery nozzle end forms certain speed and the jet angled with axis.Its spouting velocity is decided on the raw material form, and general operation attitude speed is between 1~140m/s.
Embodiment 1
Adopt technology of the present invention, to more small-sized vapourizing furnace (being equivalent to day 50~1000 tons of coals of processing), adopt overhead single nozzle scheme to realize that coal slurry and coke(oven)gas gasify altogether, vapourizing furnace adopts lining of fire brick.Respectively gasify by 50% weight ratio with Firing Shenhua Coal and coke(oven)gas, coal is carried with 65% coal water slurry, and coke(oven)gas delivers into nozzle after compression.This vapourizing furnace day is handled 400 tons in coal, 400 tons of coke(oven)gas.Raw coal and coke(oven)gas composition are listed table 1 and table 2 respectively in.
When vapor pressure is 6.5MPa, during 1350 ℃ of vapourizing furnace temperature outs, vapourizing furnace outlet synthetic gas forms and the main technique index is listed table 3 and table 4 in.
The technology nozzle is a three-channel nozzle, and cone angle is 30 °, and centre channel is that oxygen, second passage are that coal slurry, outer passage are coke(oven)gas, and the speed of nozzle-end oxygen, coal slurry and coke(oven)gas is respectively 120m/s, 8m/s, 90m/s.
Embodiment 2
Adopt technology of the present invention, to large-scale vapourizing furnace (being equivalent to day 1000~6000 tons of coals of processing), adopt the multi-nozzle scheme to realize that coal slurry and coke(oven)gas gasify altogether, vapourizing furnace adopts lining of fire brick.Respectively gasify by 50% weight ratio with Firing Shenhua Coal and coke(oven)gas, coal is carried with 65% coal water slurry, and coke(oven)gas delivers into nozzle after compression.This vapourizing furnace day is handled 1500 tons in coal, 1500 tons of coke(oven)gas.Raw coal and coke(oven)gas composition are listed table 1 and table 2 respectively in.When vapor pressure is 6.5MPa, during 1350 ℃ of vapourizing furnace temperature outs, vapourizing furnace outlet synthetic gas forms and the main technique index is listed table 3 and table 4 in.
Vapourizing furnace adopts the multi-nozzle scheme, and 5 road nozzles are set, and 4 road opposed nozzles and 1 road overhead nozzle, each raw material are divided into 5 the tunnel and enter vapourizing furnace through the technology nozzle.The technology nozzle is a three-channel nozzle, and cone angle is 60 °, and centre channel is that oxygen, second passage are that coal slurry, outer passage are coke(oven)gas, and the speed of nozzle-end oxygen, coal slurry and coke(oven)gas is respectively 100m/s, 8m/s, 100m/s.