CN208104452U - A kind of microwave reduction shaft kiln - Google Patents

Abstract

The utility model discloses a kind of microwave reduction shaft kiln, it is introduced including kiln body, feed pipe, shedding mechanism and reducing gas, fairlead, microwave feedback mouth is provided in kiln body, reducing gas introduces pipe and is inserted into inside kiln body from feed pipe, it is introduced on pipe one end in reducing gas and is additionally provided with upper plate, reducing gas fairlead is arranged in kiln body；After material fills kiln filling body inside, material forms the material natural packing conical surface one at charging pipe port, make to form space one between the material natural packing conical surface one and kiln body inner top, the material natural packing conical surface two is formed at the bottom for being located at upper plate, makes to form space two between the material natural packing conical surface two and upper plate bottom；When work, microwave acts on material by microwave feedback mouth and space one, and reducing gas introduces pipe by reducing gas and space two restores material, and the reducing gas after restoring to material is led to outside kiln body through reducing gas fairlead again.The cost of the utility model, low energy consumption.

Description

A kind of microwave reduction shaft kiln

Technical field

The utility model relates to a kind of microwave reduction shaft kilns, belong to microwave high-temperature technical field of smelting.

Background technique

Sponge iron is also known as direct reduced iron, with backwash frequency is low, compression strength is high, not dusting, not hardened, specific surface area Greatly, the advantages that active high and favorable regeneration effect.Sponge iron is to pass through height in the reactor of rotary furnace, shaft furnace or other forms Low-carbon cellular product made of warm reduction reaction.

It needs to be fully warmed-up environment in equipment in process, then passes through heat conduction and infra-red radiation Mode is heated on material, since heat conductive process is heated the parameters such as the thermal coefficient of temperature gradient, furnace chamber and material Limitation, causes whole heating process slow, biggish temperature gradient is easy to produce inside material, capacity usage ratio is low, Bu Nengbao Keep steady fixed high-recovery, also will cause the serious waste of non-renewable resources, generates exhaust gas discharge, pollutes environment.

Microwave heating generates heat as a kind of Novel heating mode, using the special Coupling effect between microwave and substance Amount realizes the whole quickly heating of material, has the characteristics that capacity usage ratio is high, environmentally protective.

The Patents documents retrieved are as follows：

One, Publication No. CN101548024A, publication date are that the Chinese invention patent on the 30th of September in 2009 discloses one kind The device of reducing iron oxides, including：Furnace body, which defines substantially sealed off with air-prevention into the furnace chamber with microwave radiation leakage； Microwave radiation is imported in the furnace chamber from microwave generator and is radiated with modulated microwave by one or more waveguides；Cloth Mouthful, it is used to the feed including iron oxide and including the carbon material associated with it introducing the furnace chamber；The feed is set to advance Pass through the device of the furnace chamber；The strength grade of the microwave radiation generated on the furnace chamber fills the feed substantially It is reduced into direct reduced iron (DRI) with dividing, but does not restore any sulphur, silica or phosphorus in the feed substantially and be used to incite somebody to action The discharge port of the furnace chamber is discharged in the product of the feed.

Two, 105783503 A of Publication No. CN, publication date are that the Chinese invention patent on July 20th, 2016 discloses one Kind industrial microwave reduction roasting device comprising furnace body is provided with sealed feeder unit at the top of furnace body, in the bottom of furnace body It is provided with sealing cooling discharging device, the furnace body is from top to bottom in turn divided into anti-leaky wave preheating zone, the oxidation roasting of microwave matrix Area and anti-leaky wave reducing zone are burnt, the top of the anti-leaky wave preheating zone connects air inducing pipeline, pressurization is provided on air inducing pipeline Device, the microwave matrix oxidizing roasting area are provided with industrial microwave heating device and air inlet, and the anti-leaky wave reducing zone connects It is connected to also Primordial Qi admission line.

Three, Publication No. CN103131815A, publication date are that the Chinese invention patent on June 5th, 2013 discloses one kind Microwave high-temperature continuously goes back the process of original production sponge iron and ferronickel, it is characterised in that is made of following process steps：One, will The miberal powder of 65-89%, the carbonaceous reducing agent of 5-20%, the water of 5-10% and the additive of 1-5%, after mixing in ball press In be pressed into diameter be 5-30mm mixture pellet；Two, mixture pellet is put into the reactor of microwave mobile response device In, the bed of material with a thickness of 10-50 cm/ per car, weight is 50-3000kg/ per car；Three, microwave mobile response device is by material The preheating section for being sent into double-layer seal microwave device is preheated, and preheating temperature is 300-500 DEG C；Four, microwave mobile response device By after preheating material be sent into double-layer seal microwave device heating chamber, high temperature microwave reduction frequency be 915-2450 MHz, Power is 100-800kW, and the microwave plumbing in heating chamber is oriented orientation mutually not to the material for entering microwave heating region Identical microwave radiation, makes temperature be rapidly increased to 800-1650 DEG C；Reducing gas or inertia protection gas are passed through in reaction process Atmosphere adjusts the air pressure of the seal chamber and separate cavities of double-layer seal microwave device, controls the flow rate and flow of gas；Five, object The time of material reduction is 5-60min, forms sponge iron or dilval；Six, the material after restoring will be completed and is sent into double-layer seal The cooling section of microwave device cools down, and after temperature of charge is lower than 300-500 DEG C, releases from double-layer seal microwave device micro- Wave mobile response device, and carry out anti-oxidation processing；Seven, with magnetic separator 2000-8000 Gauss magnetic separation, obtain be with sponge iron Main ferronickel powder becomes ferro-nickel product after briquetting.

Four, 104745757 A of Publication No. CN, publication date are that the Chinese invention patent on July 1st, 2015 discloses one Kind microwave fuel combined heat formula coal-based direct reduction method, material enters by dry and preheating restores operation；First with combustion The mode of material burning restores material, is then further restored by the way of microwave radiation to material；Metal oxygen Fixed carbon of the reducing agent needed for compound is reduced to metal in material.

To sum up, a kind of microwave reduction shaft kiln and its restoring method how to be designed, can with lower cost and energy consumption into Row production and the quality of output object can be improved and output efficiency is technical problem urgently to be solved.

Utility model content

Technical problem to be solved in the utility model is in view of the deficiencies in the prior art, to provide a kind of microwave also Former shaft kiln can be produced with lower cost and energy consumption and be improved the quality and output efficiency of output object, practical.

In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of microwave reduction shaft kiln, including Kiln body, the feed pipe being arranged at the top of kiln body and the shedding mechanism that kiln body bottom is set, at the top of the kiln body on be additionally provided with it is micro- Wave presents mouth, it is characterised in that：The microwave reduction shaft kiln further includes that reducing gas introduces pipe and reducing gas fairlead, also Primordial Qi One end that body introduces pipe is inserted into inside kiln body from the feed pipe at the top of kiln body, introduces pipe in the reducing gas being located inside kiln body Upper plate is additionally provided on one end, reducing gas fairlead is arranged in kiln body；When material is filled in kiln filling body by feed pipe Behind portion, material forms the material natural packing conical surface one at the charging pipe port being located inside kiln body, so that material natural packing Space one is formed between the conical surface one and kiln body inner top, material forms the material natural packing conical surface at the bottom for being located at upper plate Two, so that forming space two between the material natural packing conical surface two and upper plate bottom；

When work, microwave is acted on the material inside kiln body and is heated to material by microwave feedback mouth and space one, Reducing gas introduces pipe by reducing gas and the material that acts on inside kiln body of space two restores material, to material into Reducing gas after row reduction is led to outside kiln body through reducing gas fairlead again.

Preferably, the kiln body includes inner kiln tube and the outer kiln body that is sleeved on outside inner kiln tube, inner kiln tube and outer kiln body it Between there are combustion space, one end port of reducing gas fairlead is arranged on the inner wall of inner kiln tube, reducing gas fairlead Other end port is arranged on the inner wall of outer kiln body, so that the inner cavity of inner kiln tube is connected to combustion space, in combustion space And it is located at the other end port of reducing gas fairlead and is provided with ignition；Material is restored in inner kiln tube, After reducing gas in inner kiln tube leads to combustion space by reducing gas fairlead, lighted through ignition empty in burning Between middle burning.

Preferably, reducing gas fairlead includes more fairleads one, confluence conduit and Duo Gen fairlead two；More extractions One end port of pipe one is arranged on the inner wall of inner kiln tube, the other end ports of more fairleads one with confluence conduit Top connection, one end port of more fairleads two are arranged on the inner wall of outer kiln body, the other end of more fairleads two Port is connected to the bottom of confluence conduit；One end port of more fairleads two is distributed uniformly and circumferentially in outer kiln body On inner wall.

Preferably, it is additionally provided with cooling water tank in the bottom of kiln body, inner kiln tube bottom side is in contact with cooling water tank, is firing The bottom for burning space is provided with thermal insulation layer at the position of cooling water tank.

Preferably, the shedding mechanism includes discharge nozzle and the moving gear that is rotatably connected in discharge nozzle；At inner kiln tube bottom Portion is provided with outlet material, and one end of discharge nozzle is connected to outlet material, and the other end of discharge nozzle is connect with outlet valve, movable tooth rotation The dynamic position being connected in discharge nozzle and be located at discharge outlet.

Preferably, the moving gear includes shaft and the tapered fluted disc that is arranged on shaft one end, and discharge nozzle is angularly disposed, Axle sleeve is provided on the discharge nozzle for being located at discharge outlet, one end of shaft passes through axle sleeve and tapered fluted disc is arranged in discharge port In, the other end of shaft is connect with rotating mechanism, is rotated by rotating mechanism energy band turn axis and tapered fluted disc.

The beneficial effects of the utility model are：The utility model is by design, so that in feed pipe after material filling is full Angle of repose at two is formed at port and at the bottom of upper plate, to reserve space one and space two, space one can be microwave Action space is provided, heating efficiency can be improved in this way and extend the service life of microwave launcher, space two can increase Exchange area between reducing gas and material, therefore, the utility model can be produced and be mentioned with lower cost and energy consumption The high quality and output efficiency of output object, it is practical.By the design to reducing gas fairlead, reducing gas is avoided In line free surrounding space causes the generation of problem of environmental pollution and the reducing gas being passed through inside kiln body is used introducing again Inner kiln tube is heated in combustion space, reduces energy consumption, reduces production cost.By one end that more fairleads two are arranged Port is distributed uniformly and circumferentially on the inner wall of outer kiln body, so that reducing gas forms Multi-point combustion, guarantees samming, thus It ensure that the stability of reduction process.Cooling water tank is set in the bottom of kiln body, the temperature of output material can be reduced, to reduce A possibility that it is oxidized improves the quality of output object.By the adjustment to top rotary table vertical position, can before work, according to The difference of the microwave source specification of selection, top rotary table is adjusted to suitable position, to improve the versatility of the utility model.

Detailed description of the invention

Fig. 1 is the schematic perspective view of microwave reduction shaft kiln in the utility model embodiment；

Fig. 2 is the schematic view of the front view of microwave reduction shaft kiln in the utility model embodiment；

Fig. 3 is the schematic perspective view after the microwave reduction shaft kiln partly cut-away in Fig. 1；

Fig. 4 is that the microwave reduction shaft kiln in Fig. 3 fills the schematic view of the front view after full with substance；

Fig. 5 is not filled by schematic view of the front view when material for the microwave reduction shaft kiln in Fig. 3；

Fig. 6 is the sectional perspective structural schematic diagram being located at shedding mechanism in Fig. 3；

Fig. 7 is the partial structural diagram being located at upper plate in Fig. 5；

In figure：1. kiln body, 111. inner kiln tubes, 112. outer kiln bodies, 2. feed pipes, 3. shedding mechanisms, 311. dischargings Pipe, 4. microwaves present mouth, and 5. reducing gas introduce pipe, and 6. reducing gas fairleads, 611. fairleads one, 612., which converge, leads Pipe, 613. fairleads two, 7. upper plates, 8. materials, the 9. material natural packing conical surfaces one, the 10. material natural packing conical surfaces Two, 11. refractory brick, 12. insulating layers, 13. auxiliary combustion gas access tubes, 14. cooling water tanks, 15. stabilizer blades, 16. every Thermosphere, 17. discharge nozzles, 18. moving gears, 181. shafts, 182. tapered fluted discs, 19. outlet material, 20. axle sleeves, A. are empty Between the space one, B. two, the combustion space C..

Specific embodiment

Further details of elaboration is done to the technical solution of the utility model in the following with reference to the drawings and specific embodiments.

Embodiment：As shown in Figures 1 to 4, a kind of microwave reduction shaft kiln, including kiln body 1, be arranged in the top of kiln body 1 into Expects pipe 2 and the shedding mechanism 3 that 1 bottom of kiln body is arranged in are additionally provided with microwave feedback mouth 4, the microwave reduction on 1 top of kiln body Shaft kiln further includes that reducing gas introduces pipe 5 and reducing gas fairlead 6, and reducing gas introduces one end of pipe 5 from 1 top of kiln body Feed pipe 2 is inserted into inside kiln body 1, is introduced on 5 one end outer peripheral surface of pipe and is additionally provided in the reducing gas being located inside kiln body 1 Disk body 7, reducing gas fairlead 6 are arranged in kiln body 1；After material 8 fills 1 inside of kiln filling body by feed pipe 2, material 8 The material natural packing conical surface 1 is formed at 2 port of feed pipe being located inside kiln body 1, so that the material natural packing conical surface 1 One A of space is formed between 1 inner top of kiln body, material 8 forms the material natural packing conical surface two at the bottom for being located at upper plate 7 10, so that forming two B of space between 7 bottom of the material natural packing conical surface 2 10 and upper plate；When work, microwave is presented by microwave Material 8 is heated on the material 8 that 4 and one A of space of mouth is acted on inside kiln body, reducing gas introduces pipe by reducing gas The material that 5 and two B of space is acted on inside kiln body restores material, and the reducing gas after restoring to material is again through also Raw-gas fairlead 6 is led to outside kiln body.The present embodiment by design so that after material filling is full at charging pipe port and Angle of repose at two is formed at the bottom of upper plate, to reserve space one and space two, space one can provide effect for microwave Space can improve heating efficiency in this way and extend the service life of microwave launcher, and space two can increase reducing gas Exchange area between material, therefore, the present embodiment can be produced with lower cost and energy consumption and improve output object Quality and output efficiency, it is practical.In the present embodiment, kiln body is cylindrical shape.One end of feed pipe protrude into kiln body and Expose to kiln body inner wall.

As shown in figure 5, the kiln body 1 include inner kiln tube 111 and be sleeved on inner kiln tube 111 outside have 11 He of refractory brick The outer kiln body 112 of insulating layer 12, there are combustion space C between inner kiln tube 111 and outer kiln body 112, the one of reducing gas fairlead 6 End port is arranged on the inner wall of inner kiln tube 111, and outer kiln body 112 is arranged in the other end port of reducing gas fairlead 6 On inner wall, so that the inner cavity of inner kiln tube 111 is connected to combustion space C, in the C of combustion space and it is located at reducing gas fairlead 6 Other end port at be provided with ignition（It is not shown in the figure）；Material is restored in inner kiln tube 111, inner kiln tube After reducing gas in 111 leads to combustion space C by reducing gas fairlead 6, lighted through ignition empty in burning Between burn in C.The present embodiment avoids the in line free surrounding space of reducing gas, causes the generation of problem of environmental pollution by design And reducing gas inside kiln body will be passed through use again and introduce combustion space inner kiln tube is heated, reduce energy Consumption, reduces production cost.In the present embodiment, inner kiln tube can be used metal material and be made, such as stainless steel.Reducing gas is drawn One end port of pipe 6 is arranged on the inner wall of the inner kiln tube 111 at one A of space, it is seen that space one also acts as also Primordial Qi The extraction of body provides the effect in space.Auxiliary combustion gas access tube is additionally provided at the other end of reducing gas fairlead 13, auxiliary combustion gas access tube 13 is inserted into the C of combustion space from the other end of reducing gas fairlead 6.When also Primordial Qi Body fairlead 6 lead to the reducing gas concentration in the C of combustion space it is inadequate when, pass through auxiliary combustion gas access tube be added auxiliary combustion Gas is burnt, such as coal gas, so that reducing gas is easy to light, guarantees the normal work of combustion space to increase the concentration of burning gases Make.

Reducing gas fairlead 6 includes more fairleads 1, confluence conduit 612 and Duo Gen fairlead 2 613；More One end port of fairlead 1 is arranged on the inner wall of inner kiln tube 111, the other end port of more fairleads 1 It is connected to the top of confluence conduit 612, one end port of more fairleads 2 613 is arranged on the inner wall of outer kiln body 112, The other end port of more fairleads 2 613 is connected to the bottom of confluence conduit 612；One end of more fairleads 2 613 Port is distributed uniformly and circumferentially on the inner wall of outer kiln body 112.The conduit 612 that converges is ring-type, and ring-type confluence conduit 612 is set It sets in the outside position of outer kiln body 112.One end port by the way that more fairleads two are arranged is distributed uniformly and circumferentially On the inner wall of outer kiln body, so that reducing gas forms Multi-point combustion, guarantee samming, to ensure that the stability of reduction process.

It is additionally provided with cooling water tank 14 in the bottom of kiln body 1, the bottom of cooling water tank is provided with stabilizer blade 15, inner kiln tube 111 Bottom side is in contact with cooling water tank 14, is provided with thermal insulation layer at the position of cooling water tank 14 in the bottom of combustion space C 16.By the way that cooling water tank is arranged, the temperature of output material can be reduced, to reduce a possibility that it is oxidized, improves output object Quality.

As shown in fig. 6, the shedding mechanism 3 includes discharge nozzle 17 and the moving gear 18 being rotatably connected in discharge nozzle 17； 111 bottom of inner kiln tube is provided with outlet material 19, one end of discharge nozzle 17 is connected to outlet material 19, the other end of discharge nozzle 17 With outlet valve（It is not shown in the figure）Connection, moving gear 18 are rotatably connected on the position in discharge nozzle 17 and being located at discharge port 19. When discharging, rough material is broken up by rotation moving gear, can be further improved output amount of substance.Lock blower etc. can be used in outlet valve Mechanism.

The moving gear 18 includes shaft 181 and the tapered fluted disc 182 being arranged on 181 one end of shaft, and discharge nozzle 17 is oblique To setting, axle sleeve 20 is provided on the discharge nozzle 17 being located at discharge port 19, one end of shaft 181 passes through axle sleeve 20 and to bore Type fluted disc 182 is arranged in discharge port 19, the other end and rotating mechanism one of shaft 181（It is not shown in the figure）It is cooperatively connected, It is rotated by one energy band turn axis 181 of rotating mechanism and tapered fluted disc 182.The mechanisms such as motor can be used in rotating mechanism one.At this In embodiment, shaft 181 and tapered fluted disc 182 be it is hollow, the internal cavities of shaft 181 and tapered fluted disc 182 can be used to It is filled with cooling water, material when to discharging carries out the cooling of a step, to further decrease a possibility that product is oxidized, improves The quality of output object.

As shown in Figures 1 to 4, a kind of reduction side of basis microwave reduction shaft kiln as described above is also disclosed in the utility model The step of method, restoring method is：

1）, material 8 filled from feed pipe 2 to inside kiln body 1, until the filling of material 8 is filled inside kiln body 1, when material 8 After 1 inside of kiln body is filled in filling, material 8 forms the material natural packing conical surface one at 2 port of feed pipe being located inside kiln body 9, so that forming one A of space between 1 inner top of the material natural packing conical surface 1 and kiln body, material 8 is at the bottom for being located at upper plate 7 The material natural packing conical surface 2 10 is formed at portion, forms space two between 7 bottom of the material natural packing conical surface 2 10 and upper plate B；

2）, control reducing gas introduces pipe 5 and two B of space by reducing gas and acts on the material 8 inside kiln body 1 to object Material 8 is restored, while being controlled microwave and being acted on the material 8 inside kiln body 1 by microwave feedback mouth 4 and one A of space to material 8 It is heated, the reducing gas after restoring to material 8 is led to outside kiln body 1 through reducing gas fairlead 6 again；

3）, observation 1 internal temperature of kiln body, when reaching reduction temperature（Reduction temperature general control is at 750 DEG C to 850 DEG C） When, it opens shedding mechanism 3 and carries out discharging.

The 3rd）Control material 8 is filled from feed pipe 2 to kiln body 1 again while opening shedding mechanism in step, So that the loading of the discharge rate of material 8 and material 8 reaches balance；1 internal temperature of kiln body is observed, when 1 internal temperature of kiln body is low When reduction temperature, shedding mechanism 3 is closed, stops discharging and charging, when 1 internal temperature of kiln body is equal to reduction temperature, again Shedding mechanism 3 is opened, discharging and charging simultaneously is started；When 1 internal temperature of kiln body is higher than reduction temperature, the discharge of material is increased Amount and loading, carry out rapid discharging and filler, stablize kiln body internal temperature in reduction temperature section.

Reducing gas introduces 5 one end of pipe and connect with upper plate, and reducing gas introduces 5 other end of pipe and rotating mechanism two （It is not shown in the figure）It being cooperatively connected, motor mechanism etc. can also be used in rotating mechanism two, when material 8 is filled into 1 inside of kiln body, Rotation reducing gas introduces pipe 5 to drive upper plate 7 to rotate, so that the material inside kiln body is uniformly by wave, it in this way can be into one Step improves the quality and output efficiency of output object.

As shown in fig. 7, the 1st）In step before material filling, according to the frequency size of microwave source, reducing gas is controlled Introducing pipe 5 drives top rotary table 7 to move up and down, to be adjusted to the vertical position of top rotary table 7.In the present embodiment, it rotates Mechanism two is arranged in lifting device（It is not shown in the figure）On, rotating mechanism two is moved by lifting device energy band, reducing gas introduces Pipe and top rotary table move up and down together.When top rotary table 7 is in vertical be adjusted, between 2 one end port of top rotary table 7 and feed pipe Distance L also change correspondingly, material bed thickness also adjusts therewith, in this way can be before work, according to the microwave source specification of selection Difference adjusts top rotary table to suitable position, to improve the versatility of the present embodiment.In the present embodiment, microwave source one As using 245MHz to 915MHz frequency.

To sum up, the utility model is by design, so that after material filling is full at charging pipe port and the bottom of upper plate Place forms angle of repose at two, to reserve space one and space two, space one can provide action space for microwave, in this way can Heating efficiency is improved, and the service life of microwave launcher can be extended, space two can increase between reducing gas and material Exchange area, therefore, the utility model can be produced with lower cost and energy consumption and improve the quality and production of output object Efficiency out, it is practical.By the design to reducing gas fairlead, the in line free surrounding space of reducing gas is avoided, ring is caused The generation of border pollution problem and will be passed through reducing gas inside kiln body use again introduce combustion space to inner kiln tube into Row heating, reduces energy consumption, reduces production cost.It is along the circumferential direction uniform by one end port that more fairleads two are arranged It is distributed on the inner wall of outer kiln body, so that reducing gas forms Multi-point combustion, guarantees samming, to ensure that the steady of reduction process It is qualitative.Cooling water tank is set in the bottom of kiln body, the temperature of output material can be reduced, so that a possibility that it is oxidized is reduced, Improve the quality of output object.It, can be before work, according to the microwave source specification of selection by the adjustment to top rotary table vertical position Difference adjusts top rotary table to suitable position, to improve the versatility of the utility model.

" multiple " described in the present embodiment refer to the quantity of " two or more ".Above embodiments are only for illustrating this Utility model is used, rather than limitations of the present invention, and person skilled in the relevant technique is not departing from the utility model Spirit and scope in the case where, can also make a variety of changes or convert, therefore all equivalent technical solutions should also belong to In the protection scope of the utility model, the protection scope of the utility model should be limited by each claim.

Claims (6)

1. a kind of microwave reduction shaft kiln, including kiln body, the feed pipe being arranged at the top of kiln body and the discharging that kiln body bottom is arranged in Mechanism, at the top of the kiln body on be additionally provided with microwave feedback mouth, it is characterised in that：The microwave reduction shaft kiln further includes that reducing gas draws Entering pipe and reducing gas fairlead, one end that reducing gas introduces pipe is inserted into inside kiln body from the feed pipe at the top of kiln body, Reducing gas inside kiln body, which introduces on pipe one end, is additionally provided with upper plate, and reducing gas fairlead is arranged in kiln body； After material fills kiln filling body inside by feed pipe, it is natural that material forms material at the charging pipe port being located inside kiln body The conical surface one is accumulated, so that forming space one between the material natural packing conical surface one and kiln body inner top, material is being located at upper plate Bottom at formed the material natural packing conical surface two so that forming space between the material natural packing conical surface two and upper plate bottom Two；

When work, microwave is acted on the material inside kiln body and is heated to material by microwave feedback mouth and space one, is restored Gas introduces the material that pipe and space two act on inside kiln body by reducing gas and restores to material, goes back to material Reducing gas after original is led to outside kiln body through reducing gas fairlead again.

2. microwave reduction shaft kiln according to claim 1, it is characterised in that：In the kiln body includes inner kiln tube and is sleeved on Outer kiln body outside kiln body, there are combustion space between inner kiln tube and outer kiln body, one end port of reducing gas fairlead is arranged On the inner wall of inner kiln tube, the other end port of reducing gas fairlead is arranged on the inner wall of outer kiln body, so that inner kiln tube Inner cavity be connected to combustion space, in combustion space and be located at reducing gas fairlead other end port at be provided with electricity Sub- igniter；Material is restored in inner kiln tube, and the reducing gas in inner kiln tube leads to combustion by reducing gas fairlead After burning space, lights through ignition and burn in combustion space.

3. microwave reduction shaft kiln according to claim 2, it is characterised in that：Reducing gas fairlead includes more fairleads One, converge conduit and Duo Gen fairlead two；One end port of more fairleads one is arranged on the inner wall of inner kiln tube, and more are drawn The other end port of outlet pipe one is connected to the top of confluence conduit, and one end port of more fairleads two is arranged at outer kiln On the inner wall of body, the other end port of more fairleads two is connected to the bottom of confluence conduit；The one of more fairleads two End port is distributed uniformly and circumferentially on the inner wall of outer kiln body.

4. microwave reduction shaft kiln according to claim 2, it is characterised in that：Cooling water is additionally provided in the bottom of kiln body Case, inner kiln tube bottom side are in contact with cooling water tank, be provided at position of the bottom close to cooling water tank of combustion space every Thermosphere.

5. microwave reduction shaft kiln according to claim 4, it is characterised in that：The shedding mechanism includes discharge nozzle and rotation The moving gear being connected in discharge nozzle；Inner kiln tube bottom is provided with outlet material, one end of discharge nozzle is connected to outlet material, discharges The other end of pipe is connect with outlet valve, and moving gear is rotatably connected on the position in discharge nozzle and being located at discharge outlet.

6. microwave reduction shaft kiln according to claim 5, it is characterised in that：The moving gear includes that shaft and setting are turning Tapered fluted disc on axis one end, discharge nozzle is angularly disposed, is provided with axle sleeve on the discharge nozzle for being located at discharge outlet, and the one of shaft Tapered fluted disc is arranged in discharge port across axle sleeve in end, and the other end of shaft is connect with rotating mechanism, passes through rotating machine Structure energy band turn axis and the rotation of tapered fluted disc.