A kind of reduction furnace head tail gas recycling device
The utility model relates to reduction furnace technology, especially a kind of reduction furnace head tail gas recycling device.
Tail gas recycling is the conventional means of modern industry energy-conserving and environment-protective, and various existence can utilize tail gas engineering to reclaim again, but the ratio of the input of retracting device and recycling is major consideration, this device of prior art and recovery method varied.If patent publication No. is CN104190206A, a kind of containing organic device for recovering tail gas, comprise the air purifier of sequential communication, gas cooler, blower fan and adsorption tanks, adsorption tanks are set side by side with many groups, air-introduced machine is provided with in adsorption tanks, and the top of adsorption tanks is also provided with gas discharge outlet, in addition blower fan air outlet by pipeline with organize adsorption tanks more and form connected mode more than one point, and air purifier is also provided with cooling water pipe, this device is applicable to the organic waste tail produced in chemical industry production process, carries out collection and re-use after recovery.And for example patent publication No. be CNCN102661666A a kind of using lime rotary kiln tail gas as drying medium, blue charcoal is dried utilize system, comprise deduster, in have the tower drier of blue charcoal, lime rotary kiln tail gas discharging pipe, tower drier, deduster are connected successively, and propose lime rotary kiln tail gas to introduce tower drier, directly contact to dry blue charcoal with the blue charcoal in tower drier, the gas that tower drier ejects is emptying after deduster dedusting.
Summary of the invention
The purpose of this utility model is the problem in order to solve conveyer belt type reduction furnace waste gas utilization in metal dust manufacture process, and provide a kind of reasonable in design, additional device is few, tail gas is directly used in the reduction furnace head tail gas recycling device of powder inlet groove preheating.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of reduction furnace head tail gas recycling device, comprise reduction furnace body of heater, power steel band, it is characterized in that the reducing gas port of export position in described reduction furnace body of heater is provided with tail gas recycle lid, tail gas recycle covers and is provided with the outside of guiding tube to powder inlet groove, and one end and the power steel band cooperation place of tail gas recycle lid are provided with exhaust combustion door.The tail gas of this programme design tail gas recycle lid to conveyer belt reduction furnace feeding mouth end reclaims, according to reducing gas ammonolysis craft gas, i.e. and N
2tail gas composition after burner hearth reduction is nitrogen, hydrogen, steam, gas density is than nitrogen: steam: hydrogen is 14:9:1, hydrogen is the lightest, and tail gas recycle lid provides enough spaces that gas is separated voluntarily, and hydrogen rises, upwards float to primary outlet, by guiding tube to powder inlet groove, to powder inlet groove heating after burning, remaining aqueous vapor, nitrogen and hydrogen partial are entered in air by the combustion of exhaust combustion doors.
As preferably, the throughput direction of described power steel band is contrary with reducing gas flow direction in the burner hearth of reduction furnace body of heater.Gas after reduction reaction, towards the circulation of powder inlet groove one end, makes device for recovering tail gas and powder inlet groove closely arrange.
As preferably, described powder inlet groove is provided with the powder feeding road entered in reduction furnace body of heater, and the outlet position in powder feeding road is provided with harmonious material device.Harmonious material device is drum-type structure, shakeouts uniform to the metal dust entered in burner hearth on steel band.
As preferably, the guiding tube that described tail gas recycle covers is provided with fire maker.
As preferably, described exhaust combustion door is made up of tail gas recycle cap body frame and power steel band feed surface, and the open height of exhaust combustion door is less than or equal to 50mm.The height of exhaust combustion door, lower than the height of tail gas recycle lid guiding tube, makes aqueous vapor, nitrogen and hydrogen partial from then on export outflow.
As preferably, the guiding tube that described tail gas recycle covers is provided with blower unit.Can adopt this programme for main equipment, hydrogen is drawn by the air inducing power utilizing blower unit suitable.
Effective effect of the present utility model is: utilize tail gas recycle lid to be fully separated by tail gas, and makes hydrogen increase to cause powder inlet groove and carry out preheating utilization, and the rate of recovery is high, and discharge is few, energy-conservation, be beneficial to environmental protection.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
In figure: 1. powder inlet groove, 2. reduction furnace body of heater, 3. reduction powder agglomates, 4. burner hearth, 5. power steel band, 6. harmonious material device, 7. steel band driving wheel, 8. tail gas recycle lid.
Detailed description of the invention
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
As shown in Figure 1, a kind of reduction furnace head of the present embodiment tail gas recycling device, design in reduction furnace body of heater 2, power steel band 5, powder inlet groove 1 one end, power steel band 5 runs under the driving of steel band driving wheel 7, reducing gas is contrary with power steel band 5 traffic direction, and namely tail gas is discharged from the stockhole of powder inlet groove 1 one end.Powder inlet groove 1 is provided with the powder feeding road entered in reduction furnace body of heater 2, at the outlet position in powder feeding road, arranges drum-type harmonious material device 6 towards reducing gas importer to side.
At reducing gas port of export position, tail gas recycle lid 8 is set, tail gas recycle lid 8 is provided with dual boot pipe, two guiding tubes are connected to the both sides external face of powder inlet groove 1, the height of tail gas recycle lid 8 is positioned at half place, reduction furnace body of heater 2 upper body, form enough interior skies thus, nitrogen, steam, hydrogen are fully separated, the one end inputted towards power steel band 5 at tail gas recycle lid 8 is provided with exhaust combustion door, exhaust combustion door is directly made up of the lid frame of tail gas recycle lid 8 and the surface of power steel band 5, and the open height of exhaust combustion door equals 50mm.
Guiding tube on tail gas recycle lid 8 is arranged an Electric spark ignitor; According on guiding tube on tail gas recycle lid 8 of the process lot size of this device, blower unit is set.
Above-described embodiment is to explanation of the present utility model, is not to restriction of the present utility model, anyly all belongs to protection domain of the present utility model to the structure after simple transformation of the present utility model.