CN110484300A - Couple the restoring heavy metal-polluted soil by plants annealing device of medium temperature gasification and high temeperature chemistry chain - Google Patents
Couple the restoring heavy metal-polluted soil by plants annealing device of medium temperature gasification and high temeperature chemistry chain Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/723—Controlling or regulating the gasification process
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/725—Redox processes
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2200/00—Details of gasification apparatus
- C10J2200/15—Details of feeding means
- C10J2200/158—Screws
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/0916—Biomass
- C10J2300/092—Wood, cellulose
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0983—Additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
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Abstract
The invention discloses the restoring heavy metal-polluted soil by plants annealing devices of a kind of coupling medium temperature gasification and high temeperature chemistry chain, it is coupled to form by medium temperature gasification reactor and high temeperature chemistry chain reaction device, high temeperature chemistry chain reaction device includes chemical chain reduction reactor, chemical chain air reactor, level-one inertia separator, secondary cyclone and level-one refeed line and second level down-comer；Medium temperature gasification reactor is connected to chemical chain reduction reactor and biomass screw feeder；Chemical chain reduction reactor is connected with chemical chain oxygen carrier feeder, chemical chain reduction reactor outlet connection level-one inertia separator and secondary cyclone, level-one inertia separator is connected to level-one down-comer, the level-one down-comer other end is connected to chemical chain air reactor, secondary cyclone is connected to second level down-comer, and second level down-comer is connected to medium temperature gasification reactor.The present invention realizes the reformation upgrading of the cascade utilization and gasification product of energy and the resource utilization of restoring heavy metal-polluted soil by plants.
Description
Technical field
The present invention relates in the energy and environment protection field rehabilitation plant annealing device more particularly to a kind of coupling in wet
Change the restoring heavy metal-polluted soil by plants annealing device with high temeperature chemistry chain.
Background technique
Along with the large scale application of phytoremediation technology, the postpartum handling problems of rehabilitation plant are come into being.Such as
Fruit does not develop suitable postpartum disposal plant, it will causes the heavy metal of enrichment to come back in environment, thus not only
It will cause the waste of manpower and material resources and financial resources, secondary pollution but will be generated to environment.
The disposition of rehabilitation plant mainly has compression landfill, burning, compost, liquid-phase extraction and pyrolysis.These technologies are passed through
Years development, technology path is more mature, but all there is some the problem of can not be ignored.Compress landfill disposal mode it is simple and
Equipment cost is lower, but is easy to produce secondary pollution, and can largely occupy valuable land resource；Incineration technology may be implemented
The minimizing of rehabilitation plant, but incinerator is expensive and is easy to produce the atmosphere pollutions such as dioxin and NOx；Compost disposition
Required device is simple and cost is relatively low, but excessive cycle and the risk for having generation secondary pollution；Although liquid-phase extraction disposition can
Achieve the purpose that recycling and reusing to recycle endophytic heavy metal, but is difficult to be used on a large scale in industrial production and cost
It is higher；90% or more volume reduction rate may be implemented in pyrolysismethod processing plant, obtains combustible gas or bio oil, but set to pyrolysis
Standby is more demanding, it is difficult to realize extensive operation.
In essence, rehabilitation plant belongs to one kind of biomass, therefore carries out chemical chain using rehabilitation plant as fuel
Gasification process has technical feasibility.However, being with maximum resource utilization compared to traditional biomass chemistry of fuel chain gasification
Main target, effective use of the rehabilitation plant chemical chain gasification in addition to realizing resource, it is often more important that realize platymiscium containing a huge sum of money
Innoxious volume reduction treatment.It is rarely reported with chemical chain process heavy metal rehabilitation plant, to chemical chain gasification technique itself
Bring different requirement and challenge:
(1) the bottom ash enrichment temperature of heavy metal and the reaction temperature of oxygen carrier mismatch.Heavy metal is enriched with most to bottom ash
Good temperature is no more than 700 DEG C, lower than the reaction temperature of oxygen carrier and fuel gas in chemical chain reduction reactor at 800-950 DEG C
It is required that.It can be seen that traditional chemical chain gasification mode will be unfavorable for enrichment of the heavy metal to bottom ash, and then influence heavy metal
The rate of recovery.
(2) transportion and transformation of heavy metal is complicated under chemical chain gasification atmosphere.Directly to rehabilitation plant chemical chain gasification,
Not only included the level-one gasification reaction of fuel and gasifying agent during it, but also has included the second level gasified reverse of gasification product and oxygen carrier
It answers, reaction atmosphere is more abundant, and reaction process is more changeable, thus necessarily causes the further multiple of heavy metal transformation transformation mechanism
It is miscellaneous, easily heavy metal is caused to escape with flue gas and flying dust into environment.
Summary of the invention
Goal of the invention: in order to solve the above technical problems, the present invention proposes that a kind of coupling medium temperature gasifies and high temeperature chemistry chain
Restoring heavy metal-polluted soil by plants annealing device, the device by medium temperature gasification coupling to high temperature chemical chain front end, from there through
The reformation upgrading of the cascade utilization and combustible gas of energy is realized in two-stage gasification；Gasify particularly by high temperature two-part, reaches and repair
Coordination between multiple plant gasification reaction temperature is enriched with temperature with heavy metal bottom ash matches.
Technical solution: the present invention couples medium temperature gasification and the restoring heavy metal-polluted soil by plants of high temeperature chemistry chain is heat-treated dress
It sets, which is coupled to form by medium temperature gasification reactor and high temeperature chemistry chain reaction device, and high temeperature chemistry chain reaction device includes chemistry
Chain reduction reactor, chemical chain air reactor, level-one inertia separator, secondary cyclone and level-one refeed line and two
Grade down-comer；The top of medium temperature gasification reactor is connected to chemical chain reduction reactor, and medium temperature gasification reactor bottom is connected with
Biomass screw feeder；Chemical chain reduction reactor bottom is connected with chemical chain oxygen carrier feeder, chemical chain reduction reaction
Device outlet is sequentially connected level-one inertia separator and secondary cyclone, and level-one inertia separator is connected to level-one down-comer,
The level-one down-comer other end is connected to chemical chain air reactor, between chemical chain air reactor and chemical chain reduction reactor
It is connected to by level-one refeed line, level-one returning charge isolator, secondary cyclone and second level down-comer is set on level-one refeed line
Connection, second level down-comer are connected to medium temperature gasification reactor.
Chemical chain reduction reactor is the composite structure of turbulent fluidized bed and fast fluidized bed.
Level-one down-comer-level-one refeed line-level-one returning charge isolator-turbulent fluidized bed-fast fluidized bed-level-one
Inertia separator-level-one down-comer constitutes level-one oxygen carrier returning charge circulation.
Medium temperature gasification reactor --- turbulent fluidized bed --- fast fluidized bed --- level-one inertia separator --- second level
Cyclone separator --- second level down-comer --- second level J-type returning charge valve constitutes second level rehabilitation plant returning charge circulation.
The gasifying agent that medium temperature gasification reactor bottom is passed through is vapor and a small amount of oxygen, rehabilitation plant molding materials and institute
It states gasifying agent reaction and generates crude combustible gas CO, H2、CH4、CO2、C2H6。
The oxygen carrier granule that chemically turbulent fluidized bed of chain reduction reactor bottom enters is contacted with crude combustible gas, is carried
Oxysome particle reforms crude combustible gas second gasification by discharging Lattice Oxygen, while adsorbing to heavy metals immobilization, cooperates with bottom ash
The secondary trapping to heavy metal contained by rehabilitation plant is completed in enrichment.
The separation system being made of level-one inertia separator and secondary cyclone is according to the difference of grain density and partial size
Different carry out Selective Separation, thick oxygen carrier are separated by level-one inertia separator first, are regenerated into chemical chain air reactor, by
Level-one refeed line and level-one returning charge isolator are sent into chemical chain reduction reactor and continue to participate in reaction；And thin char particle is in second level
It is separated in cyclone separator, and is sent into medium temperature gasification reactor by second level refeed line and second level returning charge J-type valve.
Reaction temperature in medium temperature gasification reactor is at 600-700 DEG C.Crude combustible gas in chemical chain reduction reactor
Reduction reaction temperature with oxygen carrier granule is at 800-950 DEG C.
Working principle: annealing device of the present invention is coupled to form by medium temperature gasification reactor and high temeperature chemistry chain reaction device；
Medium temperature gasification reactor is bubbling fluidization bed structure；High temeperature chemistry chain reaction device includes chemical chain reduction reactor, chemical chain sky
Solid/liquid/gas reactions device, two-stage separation system and two-stage material returning device, wherein chemical chain air reactor is mobile bed structure, two fractions
From the combination that system is level-one inertia separator and secondary cyclone.Control is medium temperature atmosphere in medium temperature gasification reactor,
Realize that the level-one gasification of rehabilitation plant obtains crude combustible gas, it is ensured that most of heavy metal migrates and solidifies to residue；Chemical chain
It is high-temperature atmosphere in reduction reactor, realizes the second gasification reformation of crude combustible gas using the Lattice Oxygen of oxygen carrier and realize
Oxygen carrier adsorbs the solidification of heavy metal, and effective trapping to rehabilitation plant heavy metal is completed in collaboration bottom ash enrichment；Chemical chain is empty
The oxidation regeneration of oxygen loss oxygen carrier is realized in solid/liquid/gas reactions device；Separator and material returning device realize combustible gas, oxygen carrier granule, carbon residue
The recycling of directional separation and oxygen carrier and char particle between grain.
Medium temperature gasification coupling to high temperature chemical chain front end is realized the cascade utilization of energy and the weight of gasification product by the present invention
Whole upgrading obtains the synthesis gas of high-quality, realizes the resource utilization of restoring heavy metal-polluted soil by plants, and realize to heat treatment
The risk that heavy metal during heat treatment enters environment is effectively reduced in the dual disposition of rehabilitation plant heavy metal in the process, weight
Point realizes harmlessness disposing.
The reformation upgrading for realizing the cascade utilization and combustible gas of energy by two-stage reaction simultaneously reaches rehabilitation plant gasification
Coordination between reaction temperature is enriched with temperature with heavy metal bottom ash matches, and realizes that the heavy metal orientation of " based on slag enrichment " is moved
It moves；Oxygen carrier is realized to the synergistic sorption of heavy metal by modification to oxygen carrier, is realized " supplemented by being adsorbed with oxygen carrier "
Heavy metal adsorption solidification, thus to obtain comparatively ideal energy utilization rate and heavy metal recovery rate, at innoxious and recycling
Set postpartum rehabilitation plant.
The utility model has the advantages that compared with prior art, the present invention has the following technical effect that
(1) in present apparatus restoring heavy metal-polluted soil by plants two-part annealing device, medium temperature gasification and high temeperature chemistry chain
Coupling, realizes the reformation upgrading of the cascade utilization and gasification product of energy, obtains the synthesis gas of high-quality, realizes a soil huge sum of money
Belong to the resource utilization of rehabilitation plant.
(2) present apparatus is by medium temperature gasification coupling and high temeperature chemistry link coupling, realize heavy metal " based on slag enrichment, with
Oxygen carrier absorption supplemented by " directional migration conversion, to achieve the purpose that the innoxious volume reduction of rehabilitation plant heavy metal.
(3) in traditional chemical chain technique, oxygen carrier usually plays the part of the role of the carrier of oxygen and heat carrier, in the present invention,
Advanced modification technology is combined by the material screening of science, oxygen carrier will be added this new role of heavy metal high-temperature adsorbing agent,
It is set to carry out synergistic sorption to rehabilitation plant heavy metal while keeping reactivity worth, to realize more function of oxygen carrier
It can expand.
Detailed description of the invention
Fig. 1 is rehabilitation plant annealing device of the present invention.
Specific embodiment
As shown in Figure 1, the specific connection type of rehabilitation plant annealing device of the present invention are as follows: the top of medium temperature gasification reactor 1
End is connected to chemical chain reduction reactor 3, and medium temperature gasification reactor is connected with biomass screw charging on the side wall of bottom
Device 15, chemical chain reduction reactor 3 are connected with chemical chain oxygen carrier feeder 16 on the side wall of bottom；Chemical chain reduction is anti-
The outlet of device 3 is answered to be sequentially connected level-one inertia separator 6 and secondary cyclone 12, level-one inertia separator 6 and level-one decline
Pipe 7 is connected to, and 7 other end of level-one down-comer is connected to chemical chain air reactor 8, and chemical chain air reactor 8 and chemical chain are also
It is connected between former reactor 3 by level-one refeed line 10, level-one returning charge isolator 11, second level whirlwind point is set on level-one refeed line
It is connected to from device 12 with second level down-comer 13, the second level down-comer other end passes through second level returning charge J-type valve 14 and medium temperature gasification reactor 1
Connection.
The specific setting steps of rehabilitation plant annealing device of the present invention are as follows:
(1) arrange that air distribution plate, gasifying agent A blow into medium temperature gasification reaction by air distribution plate in 1 bottom end of medium temperature gasification reactor
Device 1, gasifying agent A therein are vapor and a small amount of oxygen.On the side wall of 1 bottom end of medium temperature gasification reactor, it is separately connected life
Auger material feeder 15 and second level down-comer 13.Second level down-comer 13 is used for char particle i returning charge, in medium temperature gasification reactor
In 1, rehabilitation plant molding materials g and bulky grain inert bed material f, at bubbling fluidization, gasify under gasifying agent A fluidisation in medium temperature
The bottom end of reactor 1 forms emulsion zone.The temperature control of medium temperature gasification reactor 1 is at 600 DEG C -700 DEG C, rehabilitation plant molding
Material g and gasifying agent A reacts, and generates crude combustible gas CO, H2、CH4、CO2And C2H6Deng most of heavy metal is moved to residue
Enrichment is moved, least a portion of heavy metal and char particle i enter high temeperature chemistry chain reaction device 2 under the carrying of gas.
(2) in the turbulent fluidized bed 4 of 3 lower part of chemical chain reduction reactor, oxygen carrier h enters from level-one refeed line 10
Or chemically supplement in chain oxygen carrier feeder 16, it is contacted at 800 DEG C -950 DEG C with crude combustible gas, release Lattice Oxygen is realized
The second gasification of crude combustible gas is reformed, while realizing that the solidification to heavy metal is adsorbed, collaboration bottom ash enrichment, which is completed to repair, plants
The secondary trapping of object heavy metal.
(3) 5 exit of fast fluidized bed of 3 upper end of chemical chain reduction reactor, oxygen loss oxygen carrier granule h after reaction and
Char particle i is taken out of by flue gas, into level-one inertia separator 6, since oxygen carrier partial size is larger, most of oxygen loss oxygen carrier
Grain h is separated to level-one down-comer 7 and enters chemical chain air reactor 8, the short grained oxygen loss oxygen carrier in part and thin carbon residue
Particle continues to be carried across level-one inertia separator 6 by flue gas into secondary cyclone 12.
(4) in chemical chain air reactor 8, it is anti-that oxygen carrier occurs for the oxygen loss oxygen carrier h that level-one inertia separator 6 is isolated
Answer, specifically: oxygen loss oxygen carrier h chemically chain air reactor 8 top enter, air B from the lower part of air reactor 8 drum
Enter, redox reaction occurs for the two contact, oxygen loss oxygen carrier granule h by air B oxidation regeneration, and the tail gas D after reacting from
The discharge of 8 upper end outlet 9 of chemical chain air reactor.Chemically overflow enters one in chain air reactor 8 for oxygen carrier after regeneration
Grade refeed line 10 is entered in turbulent fluidized bed 4 by level-one returning charge isolator 11 again continues to participate in chemical chain reaction.Level-one decline
Pipe 7-level-one refeed line 10-level-one returning charge isolator 11-turbulent fluidized bed, 4-fast fluidized bed, 5-level-one inertia separator
6-level-one down-comers 7 constitute level-one oxygen carrier returning charge circulation.
(5) in secondary cyclone 12, after a small amount of oxygen loss oxygen carrier granule h and char particle i in flue gas are separated
Second level down-comer 13 and second level J-type returning charge valve 14 are sequentially entered, under the blowing of vapor C, is back to medium temperature gasification reactor 1
Carry out secondary response.Fuel is in medium temperature gasification reactor 1- turbulent fluidized bed 4- fast fluidized bed 5- level-one inertia separator 6- bis-
Shuttling movement between grade cyclone separator 12- second level down-comer 13- second level J-type returning charge valve 14 constitutes second level rehabilitation plant and returns
Material circulation.
(6) it exports, is obtained with CH in secondary cyclone 124, CO and H2For the synthesis gas E of main component, rehabilitation plant
Heavy metal a part of absorption is enriched with to bottom ash, and another part is by oxygen carrier absorption solidification, to complete the money to rehabilitation plant
Source, harmlessness disposing.
Rehabilitation plant molding materials g, inert bed material f, char particle i in reaction system comprising varying particle size and
Oxygen loss oxygen carrier granule h；Wherein, rehabilitation plant molding materials g is strip-shaped materials, is sent into medium temperature through biomass screw feeder 15
Gasification reactor 1；Inert bed material f is large-sized coarse granule, only carries out fluidisation movement, shape in 1 bottom of medium temperature gasification reactor
At emulsion zone；Inert bed material and rehabilitation plant molding materials are in bubbling fluidization under gasifying agent fluidization, are conducive to repair
The abundant pyrolysis of plant obtains crude combustible gas, while heavy metal is enriched with to lime-ash；Char particle i is thin of small size
Grain, is widely distributed in medium temperature gasification reactor 1, while part is carried to high temperature chemical chain reaction device 2 by air-flow and continues to join
It is reacted with chemical chain gasification, the complete part of last unreacted, which is continued on through, enters secondary cyclone by level-one inertia separator 6
12, it is wherein being separated and is being back in medium temperature gasification reactor 1 that the reaction was continued；Oxygen carrier granule h is small of medium size
Grain, into 4 bottom of turbulent fluidized bed after only move upwards, and without falling into medium temperature gasification reactor 1, will not with it is coarse grained lazy
Property bed material f is in contact, and can be efficiently separated by level-one inertia separator 6 to chemical chain air reactor 8, after through one
Grade refeed line 10, level-one returning charge isolator 11 return to 4 bottom of turbulent fluidized bed and continue to participate in chemical chain gasification reaction.
Claims (9)
1. a kind of restoring heavy metal-polluted soil by plants annealing device of coupling medium temperature gasification and high temeperature chemistry chain, it is characterised in that:
Described device is coupled to form by medium temperature gasification reactor (1) and high temeperature chemistry chain reaction device (2), the high temeperature chemistry chain reaction device
It (2) include chemical chain reduction reactor (3), chemical chain air reactor (8), level-one inertia separator (6), second level cyclonic separation
Device (12) and level-one refeed line (10) and second level down-comer (13)；The top of the medium temperature gasification reactor (1) and chemical chain
Reduction reactor (3) connection, medium temperature gasification reactor bottom is connected with biomass screw feeder (15)；Chemical chain reduction reaction
Device (3) bottom is connected with chemical chain oxygen carrier feeder (16), and chemical chain reduction reactor (3) outlet is sequentially connected level-one inertia
Separator (6) and secondary cyclone (12), level-one inertia separator (6) are connected to level-one down-comer (7), level-one down-comer
(7) other end is connected to chemical chain air reactor (8), is passed through between chemical chain air reactor and chemical chain reduction reactor
Level-one refeed line (10) is connected to, and level-one returning charge isolator (11) are arranged on level-one refeed line, under secondary cyclone and second level
Drop pipe (13) connection, second level down-comer are connected to medium temperature gasification reactor.
2. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 1 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: the chemical chain reduction reactor (3) is the combination knot of turbulent fluidized bed (4) and fast fluidized bed (5)
Structure.
3. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 2 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: the level-one down-comer (7)-level-one refeed line (10)-level-one returning charge isolator (11)-turbulent fluidization
Bed (4)-fast fluidized bed (5)-level-one inertia separator (6)-level-one down-comer (7) constitutes the returning charge of level-one oxygen carrier and follows
Ring.
4. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 2 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: the medium temperature gasification reactor (1)-turbulent fluidized bed (4)-fast fluidized bed (5)-level-one inertial separation
Device (6)-secondary cyclone (12)-second level down-comer (13)-second level J-type returning charge valve (14) constitutes second level rehabilitation plant and returns
Material circulation.
5. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 1 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: the gasifying agent (A) that medium temperature gasification reactor (1) bottom is passed through is vapor and a small amount of oxygen, is repaired
Plant molding materials are reacted with the gasifying agent generates crude combustible gas CO, H2、CH4、CO2、C2H6。
6. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 2 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: the oxygen carrier granule (h) entered from the turbulent fluidized bed (4) of chemical chain reduction reactor (3) bottom
It is contacted with crude combustible gas, oxygen carrier granule (h) reforms crude combustible gas second gasification by discharging Lattice Oxygen, while counterweight
The secondary trapping to heavy metal contained by rehabilitation plant is completed in metal-cured absorption, collaboration bottom ash enrichment.
7. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 1 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: thick oxygen carrier is separated by level-one inertia separator (6) first, again into chemical chain air reactor (8)
It is raw, chemical chain reduction reactor (3) are sent by level-one refeed line (10) and level-one returning charge isolator (11) and continue to participate in reaction；And
The separation in secondary cyclone (12) of thin char particle (i), and pass through second level refeed line (13) and second level returning charge J-type valve
(14) it is sent into medium temperature gasification reactor (1).
8. the restoring heavy metal-polluted soil by plants of coupling medium temperature gasification according to claim 1 and high temeperature chemistry chain is heat-treated and fills
It sets, it is characterised in that: the reaction temperature in the medium temperature gasification reactor (1) is at 600-700 DEG C.
9. the heavy metal-polluted soil reparation of coupling medium temperature gasification and high temeperature chemistry chain according to any one of claim 1 to 8
Plant annealing device, it is characterised in that: the reduction of crude combustible gas and oxygen carrier granule in chemical chain reduction reactor (3)
Reaction temperature is at 800-950 DEG C.
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