CN1112164A

CN1112164A - Production method and apparatus for preheating mixed sinter material using sintered hot waste gas

Info

Publication number: CN1112164A
Application number: CN 95103859
Authority: CN
Inventors: 任志国; 谢华
Original assignee: Central Iron and Steel Research Institute
Current assignee: Central Iron and Steel Research Institute
Priority date: 1995-04-20
Filing date: 1995-04-20
Publication date: 1995-11-22
Anticipated expiration: 2015-04-20
Also published as: CN1039657C

Abstract

The hot air in cover of cooling machine is directly introduced out and after dusted and pressurized, it is blasted into primary and secondary mixers with the hot air amount of 100-400 cu.m per ton of mixed material for preheating the mixed material. Its advantages include reducing productive cost, good granulating effect and high output of sintering machine.

Description

Production method and apparatus for preheating mixed sinter material using sintered hot waste gas

The invention belongs to the production unit in the iron making and sintering field.Be specially adapted to utilize the hot waste gas that produces in the sintering production process to remove the pre-heating mean and the device of direct preheating sinter mixture.

In the prior art, the general sinter bed of sintering process on sinter machine existed wet band, arid zones, preheating zone, sintering zone and 5 zone bands of cooling zone.It is bigger to the ventilation property influence of the bed of material to cross wet band, and the output of sinter machine is decreased.In order to eliminate the ventilation property problem that adopts steam the method more than the preheating temperature to 70 of compound ℃ to be solved the wet band bed of material by crossing this influence that wet band is brought, only having in the prior art at present.(" blast furnace ironmaking " Northeast Polytechnic College volume).The steam required equipment is invested and productive expense is higher, operation increases but produce, and makes agglomerate integral production cost up, causes unnecessary waste.

The objective of the invention is to propose a kind of economy with using method simple and reliable with sintering hot waste gas preheating sinter mixture production method and device.

According to the preheating sinter mixture production method that the object of the invention proposed, we adopt the hot waste gas of being discharged in the existing sinter machine production process, again sinter mixture are carried out preheating and utilization behind purifying and dedusting.And the production unit that the inventive method adopted can be described below with reference to the accompanying drawings: this accompanying drawing is the structural representation of the present invention's energy preheating mixture equipment.In the accompanying drawings, 1 is air bells cap, and 2 is air draft pipe, and 3 is fly-ash separator, and 4 is vacuum fan, and 5 is the hot blast delivery manifold, and 6 is the primary mixer hot blast manifold, and 77' is the hot blast nozzle, and 8 is primary mixer, and 9 is the second drum mixer hot blast manifold, and 10 is second drum mixer.Below be according to the present invention accompanying drawing to the explanation of the inventive method and device.On cooler air bells cap 1, be connected with air draft pipe 2, and the inlet mouth of the other end of air draft pipe 2 and fly-ash separator 3 joins, the outlet side of fly-ash separator 3 and vacuum fan 4 link, the outlet side of vacuum fan 4 is connected to hot blast delivery manifold 5 inlet end, and hot blast delivery manifold 5 has two air outlets, one joins and stretches in the primary mixer 8 with primary mixer hot blast manifold 6, and several hot blast nozzles 7 are installed on primary mixer hot blast manifold 6.Another air outlet of hot blast delivery manifold 5 then joins with second drum mixer hot blast manifold 9, several hot blast nozzle 7' is being installed on the arm 9 and is stretching in second drum mixer 10.Method of the present invention is to adopt 150～400 ℃ the hot waste gas of being extracted out by air bells cap 1 on the cooler to deliver to by air draft pipe 2 to carry out dedusting in the fly-ash separator 3, after vacuum fan 4 pressurizations, hot blast is divided into two strands of hot blast streams again by hot-blast main 5, one props up 6 by the primary mixer heating duct, by hot blast nozzle 7 hot blast is sprayed onto on the compound stream interface of primary mixer 8.Once spray hot blast rate and should account for 30～60% of hot blast total amount, the temperature rise of compound mainly is to rely on transmission of heat by contact and transmission of heat by convection, and hot blast also heats mixer wall simultaneously, so the heat on the mixer wall has also been passed to compound.In warm, the moisture content of compound will have a certain amount of loss.Therefore the moisture content of compound can be controlled in the best and makes 85～100% of ball moisture content and be very beneficial for making ball like this in primary mixer.Another strand hot blast in hot blast delivery manifold 5 is by second drum mixer heating duct 9 and hot blast nozzle 7' 70～40% hot blasts of hot blast total amount to be jetted on the charge level that rolls to second drum mixer 10, and the same heat transfer type of employing and primary mixer is finished the secondary preheating.Sinter mixture temperature after the preheating of process secondary is at 60 ℃～90 ℃.But in sinter mixture, if it is more or to add unslaked lime more to add hot returning ore, then the initial temperature of compound is higher, can adopt only installation hot blast nozzle 7' in second drum mixer this moment.Adopt the inventive method, improving the ultimate principle of making ball with increase moisture content is because sintering process in the prior art had wet band, make 80～85% of the best moisture content of ball so the water-content of sinter mixture can only be controlled at, crossing the wet ventilation property of being with the formation sposh shape bed of material to influence sinter bed in the time of so just can avoiding sintering.And the inventive method is to adopt the moisture content of compound to make ball moisture content near the best, and compound is made ball under such moisture content can cause ball very soon.Simultaneously hot-blast pressure is controlled between 500～2000Pa, and winding-up is on the mixed sintering charge level, compound will remove a part of moisture content in making the ball process, simultaneously hot blast can be very fast with the material temperature rise of compound to more than the dew-point temperature, can not produce wet phenomenon in the bed of material so on sintering pallet, mix in the sintering process.In the methods of the invention, according to the hot blast temperature difference, should adopt sinter mixture hot blast consumption per ton at 100～400m ³Created advantageous conditions and improved material temperature owing to make ball, eliminated the ventilation property that the wet band of the mistake that the bed of material forms in the sintering process improves compound, can improve the output of sinter machine significantly for sinter mixture.

Adopt the production method and the device of the present invention's energy preheating sinter mixture to have following characteristics compared with prior art.Adopting the inventive method and device is that the hot waste gas that utilizes in the sintering production process to be discharged removes direct preheating sinter mixture, so not only can reduce the production cost of pre-heat mixture, and sinter mixture is in sintering process, can not produce excessive moistening layer, obviously improve the ventilation property of compound and improve the output of sinter machine significantly.Adopt the inventive method in addition because when making ball, can remove a part of moisture content, to expect that simultaneously temperature rise is to more than the dew-point temperature, so can make the water distribution in sinter mixture of ball moisture content by the best when sinter mixture is made ball, balling-up was highly beneficial when this made ball to sinter mixture.Therefore it is low to adopt the inventive method and device to have production cost compared with prior art, makes characteristics such as ball effect and sinter machine output height.

Embodiment

Accompanying drawing according to the inventive method and device is described below this embodiment: we adopt in the sinter machine cooler petticoat pipe to extract 300 ℃ hot waste gas out, process air draft pipe 2 is delivered to and is carried out dedusting in the fly-ash separator 3, after being forced into 1200Pa by vacuum fan 4 again, be transported to hot blast near the primary mixer by hot blast delivery manifold 5 again and hot blast is divided into two strands, first strand is that 40% of hot blast total amount is delivered to primary mixer 8, by hot blast nozzle 7 hot blast is jetted to the mixing charge level that stirs, compound is carried out preheating.The sinter mixture that we adopt, it is 8.5% that its best is made ball moisture content.For the evaporation of balance compound moisture content in warm with help making ball, we add the water yield in the primary mixer inner control is that sinter mixture moisture (the best the is made ball moisture content) amount that primary mixer is 8%.Higher by about 14% than the common mixed once method adding water yield.And second hot blast stream is by second drum mixer hot blast manifold 9 and nozzle 7', and 60% the hot blast that total hot blast rate is remaining is jetted on the charge level that rolls in the second drum mixer 10, and sinter mixture is carried out preheating.Should expect again that cloth carried out sintering to sintering pallet after adopting aforesaid method that sinter mixture is made ball and preheating, can eliminate the excessive moistening layer that produces in the sintering process, improve the output about 10% of sinter machine.

Claims

1, a kind of method and apparatus that utilizes sintering hot waste gas energy preheating sinter mixture, the composition of its this device is by hot-air system and primary mixer, the duct coupling of second drum mixer and this device etc., it is characterized in that this device is to be connected with air draft pipe (2) on cooler air bells cap (1), the other end of air draft pipe (2) is that the inlet mouth with fly-ash separator (3) joins, the outlet side of fly-ash separator (3) connects with vacuum fan (4), the outlet side of vacuum fan (4) is connected to the inlet mouth of hot blast delivery manifold (5), air outlet and primary mixer hot blast manifold (6) among the hot blast delivery manifold (5) join, and stretch in the primary mixer (8), hot blast nozzle (7) is housed on hot blast manifold (6), another air outlet of hot blast delivery manifold (5) is to connect with second drum mixer hot blast manifold (9), hot blast nozzle (7 ') also is being installed on this arm (9) and is stretching in second drum mixer (10).

2, according to the described method and apparatus of claim 1, it is characterized in that can preheating the method for sinter mixture be to adopt the hot blast of being discharged in the sinter cooler air bells cap (1) through fly-ash separator (3) dedusting and by sending into primary mixer (8) respectively after vacuum fan (4) pressurization and second drum mixer (10) is interior to the sinter mixture preheating.

3, according to claim 1,2 described method and apparatus, it is characterized in that hot blast nozzle (7) (7') preceding hot-blast pressure should be controlled at 500～2000Pa.

4,, it is characterized in that the blowing hot air amount should be by sinter mixture hot blast consumption per ton at 100～400m according to claim 2,3 described methods ³