CN103409577B - Continuous external heating type reducing gas direct-reduced iron method - Google Patents

Continuous external heating type reducing gas direct-reduced iron method Download PDF

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CN103409577B
CN103409577B CN201310346040.7A CN201310346040A CN103409577B CN 103409577 B CN103409577 B CN 103409577B CN 201310346040 A CN201310346040 A CN 201310346040A CN 103409577 B CN103409577 B CN 103409577B
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gas
reduction
combustion chamber
reducing
combustion
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CN103409577A (en
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王新民
王小群
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Shanxi Xinli Energy Technology Co Ltd
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Shanxi Xinli Energy Technology Co Ltd
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Abstract

The open continuous external heating type reducing gas direct-reduced iron method of the present invention, step is: (1), by lump ore or iron ore pellets are sent into preheating in pre-heating cabin, then enters reduction room; (2), by outer gas-operated thermal bath facility, interior gas-operated thermal bath facility adopt duplex combustion chamber and commutation accumulation of heat heating means to gas-fired after purification, provide thermal source to reduction room; (3), by reducing gas, high temperature reduction gas is formed to the high-temp solid product direct-reduced iron cooling after reduction reaction; (4), high temperature reduction gas enters reduction room and high temperature lump ore or iron ore pellets material and carries out reduction reaction and generate tail gas after high temperature reduction; (5) after, reducing, tail gas imports pre-heating cabin to lump ore or iron ore pellets preheating; (6), according to lump ore or iron ore pellets reducing degree, reed time controll charging valve and discharge with endless screw device are opened or are closed, and lump ore or iron ore pellets are added the reduction room of reducing apparatus; Solid product direct-reduced iron after reduction cooling is entered closed finished bin.

Description

Continuous external heating type reducing gas direct-reduced iron method
Technical field
The present invention relates to gas base method reduced iron technology, particularly continuous external heating type reducing gas direct-reduced iron method.
Background technology
At present, producing direct-reduced iron (DRI) by using reductive agent different, mainly containing the large class of the gentle base method two of coal-based method.Gas base method mainly with Sweet natural gas or with coal manufacture reducing gas or with coke-oven gas (COG), converter gas and (or) blast furnace (BF) stock gas replace Sweet natural gas be reductive agent and thermal source, coal-based method take coal as reductive agent and thermal source.Coal-based method has kinds of processes, but production efficiency low, invest high, pollute large, the base method that makes to bring about the desired sensation becomes the main flow of direct reduction iron making.
Traditional gas base method take Shaft Furnace Direct Reduction Process as technological trend, along with the development of gas-based shaft kiln directly reduced technology, now also there are many technical literature introductions, as patent documentation CN102304599A describes a kind of method and apparatus of gas-based reduction shaft furnace production direct-reduced iron, coke-oven gas is mainly first isolated H2 and Lin De gas by the literature, again H2 and gas maked coal Hybrid Heating are become reducing gas, woods moral gas is as cooling gas, the shortcoming of this technology is needed to consume heat energy H2 and gas maked coal Hybrid Heating, and production cost can increase; In addition about the method for gas base method patent documentation a kind of iron ore_coal pellet self-produced reducing gas production direct-reduced iron as CN1896286B introduces, the reducing gas of heating is utilized to pass in reduction shaft furnace, heat new iron ore_coal pellet, produce new pyrolysis gas H2, CO and top gas CO2, H2O, the cyclic production of Primordial Qi of surviving in formation and use, the shortcoming of this technology produces actual being easy to of new pyrolysis gas H2, CO to generate CO2, H2O in body of heater burning, H2, CO of obtaining are little, are difficult to realize continuous, efficient, a large amount of reduced iron and produce.
Given this, the present inventor has carried out deep analysis and research to gas-based shaft kiln directly reduced technique, has invented the gas-based shaft kiln directly reduced iron composite technology technology that a whole set of is new.
Summary of the invention
The invention provides continuous external heating type reducing gas direct-reduced iron method, the preheating of direct-reduced iron, reduction, heating and cooling are concentrated and are integrated by the method, and reduction efficiency is high, are applicable to continuously the also original production of a large amount of direct-reduced iron.
The present invention is achieved through the following technical solutions: continuous external heating type reducing gas direct-reduced iron method, and the method relates to that equipment comprises body of heater, pre-heating cabin, enters stove cloth passage, external-heat reducing gas direct-reduced iron device, tail gas exhaust channel, discharge with endless screw device after reduction, close finished bin; Step is:
(1), by lump ore or iron ore pellets are sent into preheating in pre-heating cabin, then pass through stove cloth passage and enter in the reduction room of the reducing apparatus of external-heat reducing gas direct-reduced iron device;
(2), adopt duplex combustion chamber and commutation accumulation of heat heating means to gas-fired after purification by the outer gas-operated thermal bath facility of the reducing apparatus of external-heat reducing gas direct-reduced iron device, interior gas-operated thermal bath facility, there is provided thermal source to reduction room, lump ore or iron ore pellets reduce under hot environment in reduction room;
(3), enter siphunculus by the reducing gas of external-heat reducing gas direct-reduced iron device and pass into reducing gas to material cooling chamber, reducing gas blows to material cooling chamber, to the high-temp solid product direct-reduced iron cooling after reduction reactions a large amount of in material cooling chamber, reducing gas is while giving the cooling of high-temp solid product direct-reduced iron, and the temperature improving reducing gas forms high temperature reduction gas;
(4), high temperature reduction gas enters reduction room, and contact with the reduction high temperature lump ore of room or iron ore pellets material, carries out tail gas after reduction reaction generation high temperature reduction;
(5), will reduce rear tail gas by tail gas exhaust channel importing pre-heating cabin after reduction to lump ore or iron ore pellets preheating, i.e. the preheating of above-mentioned 1st step, the steam after high temperature reduction in tail gas is cooled to water and discharges through heat exchange;
(6), according to lump ore or iron ore pellets reducing degree, reed time controll charging valve opens or cuts out, and lump ore or iron ore pellets is passed through stove cloth passage and enters in the reduction room of reducing apparatus; Control discharge with endless screw device to open or close, the solid product direct-reduced iron after lump ore in material cooling chamber or iron ore pellets reduction cooling is entered in closed finished bin.
Described outer gas-operated thermal bath facility adopts duplex combustion chamber and commutation accumulation of heat heating means, the method relates to equipment and comprises outer gas-operated thermal bath facility, gas reversing system, outer gas-operated thermal bath facility comprises the first combustion heater, second combustion heater of at least one group of identical association of structure, the first described combustion heater mainly comprises the first combustion chamber, the first coal gas enters arm and the first regenerative heat exchanger, second combustion heater structure also comprises the second combustion chamber, the second coal gas enters arm and the second regenerative heat exchanger, and the step of the method is:
(1), air is blasted the first regenerative heat exchanger by gas reversing system, enter in the first combustion chamber enter heating after the first regenerative heat exchanger heating after, purified gas blasts in the first combustion chamber and burns by gas reversing system, waste gas in first combustion chamber after purified gas burning enters into the second combustion chamber, then is discharged by gas reversing system after the second regenerative heat exchanger heat absorption;
(2), reach setting combustion time, air is blasted the second regenerative heat exchanger by gas reversing system, enter in the second combustion chamber enter heating after the second regenerative heat exchanger heating after, purified gas blasts in the second combustion chamber and burns by gas reversing system, waste gas in second combustion chamber after purified gas burning enters into the first combustion chamber, then is discharged by gas reversing system after the first regenerative heat exchanger heat absorption.
Described interior gas-operated thermal bath facility adopts duplex combustion chamber and commutation accumulation of heat heating means, the method relates to equipment and comprises interior gas-operated thermal bath facility, gas reversing system, interior gas-operated thermal bath facility comprises the 3rd combustion heater, the 4th combustion heater of at least one group of identical association of structure, the 3rd described combustion heater mainly comprises the 3rd combustion chamber, the 3rd coal gas enters arm and the 3rd regenerative heat exchanger, 4th combustion heater structure also comprises the 4th combustion chamber, the 4th coal gas enters arm and the 4th regenerative heat exchanger, and the step of the method is:
(1), air is blasted the 3rd regenerative heat exchanger by gas reversing system, enter in the 3rd combustion chamber enter heating after the 3rd regenerative heat exchanger heating after, purified gas blasts in the 3rd combustion chamber and burns by gas reversing system, waste gas in 3rd combustion chamber after purified gas burning enters into the 4th combustion chamber, then is discharged by gas reversing system after the 4th regenerative heat exchanger heat absorption;
(2), reach setting combustion time, air is blasted the 4th regenerative heat exchanger by gas reversing system, enter in the 4th combustion chamber enter heating after the 4th regenerative heat exchanger heating after, purified gas blasts in the 4th combustion chamber and burns by gas reversing system, waste gas in 4th combustion chamber after purified gas burning enters into the 3rd combustion chamber, then is discharged by gas reversing system after the 3rd regenerative heat exchanger heat absorption.
Reduction of the present invention is heated with reduction and is independently carried out, and be independent of each other, reducing gas is directly introduced by the external world, and reducing gas introduction volume regulates according to reduction high temperature lump ore or iron ore pellets situation, and reduction efficiency is high, distinguishes the existing self-produced reducing gas mode of production; The solid product higher by the temperature after utilizing lump ore or the reduction of iron ore ball directly contacts and heat reduction gas with reducing gas, high-temperature tail gas after reduction carries out preheating to the lump ore or iron ore pellets that enter stove again, do not need to increase independent heating installation, direct-reduced iron production cost is minimized, what meet that we advocate now is energy-saving and cost-reducing, the theory of Sustainable development.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is continuous external heating type reducing gas direct-reduction iron furnace schematic diagram of the present invention.
Fig. 2 is gas diverter schematic diagram of the present invention.
Gas diverter of the present invention coils schematic diagram to Fig. 3.
Fig. 4 is gas diverter lower wall schematic diagram of the present invention.
Fig. 5 is A-B place cross-sectional schematic in Fig. 3.
Fig. 6 is gas diverter of the present invention and combustion heater pipe network connection diagram.
Fig. 7 is continuous external heating type reducing gas direct-reduction iron furnace schematic cross-section one of the present invention, that is t-t place schematic cross-section in Fig. 1.
Fig. 8 is continuous external heating type reducing gas direct-reduction iron furnace schematic cross-section two of the present invention, that is u-u place schematic cross-section in Fig. 1.
Fig. 9 is continuous external heating type reducing gas direct-reduction iron furnace schematic cross-section three of the present invention, that is v-v place schematic cross-section in Fig. 1.
Figure 10 is continuous external heating type reducing gas direct-reduction iron furnace schematic cross-section four of the present invention, that is x-x place schematic cross-section in Fig. 1.
Figure 11 is continuous external heating type reducing gas direct-reduction iron furnace schematic cross-section five of the present invention, that is y-y place schematic cross-section in Fig. 1.
Figure 12 is continuous external heating type reducing gas direct-reduction iron furnace stove schematic cross-section six of the present invention, that is z-z place schematic cross-section in Fig. 1.
Figure 13 is industry control central electrical connection diagram of the present invention.
Figure 14 is continuous external heating type reducing gas direct-reduced iron integration unit of the present invention composition schematic diagram.
Figure 15 is pre-heating cabin cross sectional representation of the present invention, that is b-b place schematic cross-section in Figure 17.
Figure 16 is the cross-sectional schematic of pre-heating cabin of the present invention, that is a-a place schematic cross-section in Figure 17.
Figure 17 is pre-heating cabin schematic diagram of the present invention, that is a-a place schematic cross-section in Figure 17.
Figure 18 is that the atomized spray that tail gas water of the present invention washes one's hair cleaner arranges schematic diagram in the form of a ring in purification cylindrical shell, that is d-d place schematic cross-section in Figure 14.
Embodiment
The specific embodiment that external-heat reducing gas direct-reduction iron furnace of the present invention comprehensively forms technique is mainly introduced in detail following.
First part's lump ore or the preparation of iron ore pellets raw material
8-30mm lump ore (raw material) is selected by crushing and screening, screen underflow is processed into the pelletizing (raw material) of about the 15mm granularity of not mixing tackiness agent through high pressure nodulizer, in this size range, lump ore or iron ore pellets reduction reaction are more abundant, but this does not form the size restriction of the present invention to required lump ore or iron ore pellets.
Second section lump ore or iron ore pellets preheating
As shown in Figure 15, Figure 16, Figure 17, Figure 14: pre-heating cabin 1, comprise housing 11, hot gas interchanger 13, blanking bin 14, drip pipe 125; The feed bin 111 being used for lump ore or iron ore pellets preheating is formed in housing 11, feed bin 111 relative closure, top is only provided with opening for feed 112, at opening for feed 112, place is provided with rotary conveyor 17, blanking bin 14 is arranged on bottom housing 11 and communicates with feed bin 111, blanking bin 14, for temporarily depositing the lump ore after preheating or iron ore pellets, connects the charging valve 15 with gas sealing function bottom blanking bin 14.
As shown in Figure 14, Figure 15, Figure 16, Figure 17, hot gas interchanger 13 comprises high temperature hot gas admission passage 131, high temperature hot gas enters room 132, radiating pipe 133, radiating pipe serial connection passage 134, cryogenic gas discharge chamber 136, high temperature hot gas admission passage 131 times termination drip pipes 125, above drip pipe 125, after reduction, tail gas exhaust channel 85 is connected on high temperature hot gas admission passage 131, high temperature hot gas admission passage 131 upper end and high temperature hot gas enter room 132 and communicate, high temperature hot gas enters room 132 and is arranged on a sidewall of housing 21, cryogenic gas discharge chamber 136 is arranged on high temperature hot gas and enters on the opposite side sidewall of room 132, cryogenic gas discharge chamber 136 is provided with cryogenic gas exhaust channel 138, the bottom of cryogenic gas discharge chamber 136 is provided with condensed water elimination arm 126, condensed water elimination arm 126 and below drip pipe 125 are connected, several radiating pipes serial connection passage 134 is parallel feed bin 111 inside being transverse in housing 11 between two, being connected on high temperature hot gas enters between room 132 and cryogenic gas discharge chamber 136, one end 1341 and the high temperature hot gas of upper radiating pipe serial connection passage 134 enter that room 132 communicates and the other end 1342 is closed, one end 1341 of next radiating pipe serial connection passage 134 is closed and between the other end 1342 and cryogenic gas discharge chamber 136, the rest may be inferred.
As Figure 15, Figure 16, shown in Figure 17, several radiating pipes 133 also adopt metallic substance to make, several radiating pipes 133 are spaced on radiating pipe serial connection passage 134, radiating pipe 133 is in " U " type, one end is connected on parallel upper radiating pipe serial connection passage 134, the other end be connected on parallel next radiating pipe serial connection passage 134 on, by mutually through for radiating pipe parallel between two serial connection passage 134, enter room 132 by high temperature hot gas to connect with cryogenic gas discharge chamber 136, this example arranges many radiating pipes 133 and radiating pipe serial connection passage 134, to increase the contact area with lump ore or iron ore pellets, improve lump ore or the pre-thermo-efficiency of iron ore pellets.
As shown in Figure 17, Figure 16, U-shaped radiating pipe 133 is connected on radiating pipe serial connection passage 134 in inverted U interval, radiating pipe serial connection passage 134 arrangement in two rows, certainly can suitably increase or reduce the quantity of U-shaped radiating pipe 133 on radiating pipe serial connection passage 134 and the quantity of radiating pipe serial connection passage 134 itself, this is the lump ore of preheating or the situation such as amount, humidity and temperature of iron ore pellets and determine as required.
As shown in Figure 17, Figure 16, U-shaped radiating pipe 133 is in inverted U, and inverted U top is wedge 1331, and this is conducive to being scattered of lump ore or iron ore pellets.
As shown in Figure 13, Figure 14, one end of rotary conveyor 17 is placed in by bucket elevator 18, the other end of rotary conveyor 17 is placed in opening for feed 112 place, bucket elevator 18, rotary conveyor 17 are connected with industry control center 90, automatically control the work by bucket elevator 18, rotary conveyor 17 by industry control center 90.
This routine lump ore or iron ore pellets pre-heating mean are:
(1), as shown in figure 14, by bucket elevator 18, lump ore or iron ore pellets are delivered to rotary conveyor 17, lump ore or iron ore pellets are sent in feed bin 111 by rotary conveyor 17 from the import 112 of the feed bin 111 of pre-heating cabin 1;
(2), tail gas after high temperature reduction is passed into high temperature hot gas entered in room 132 by reduction tail gas exhaust channel 85, high temperature hot gas admission passage 131 simultaneously, flow in radiating pipe 133 by radiating pipe serial connection passage 134 again, another adjacent heat radiation pipe again by being connected with radiating pipe 133 is connected in series passage 134 and flows in cryogenic gas discharge chamber 136, and last cryogenic gas exhaust channel 138 is discharged;
(3) the lower coal bunker 14 that the lump ore, after preheating or iron ore pellets finally fall into housing 11 bottom is temporarily deposited, for lower one reducing gas direct-reduced iron operation, from and constantly to the feed bin 111 of housing 11, supplement new lump ore or iron ore pellets by bucket elevator 18, rotary conveyor 17, realize the continuously dehydrating of lump ore or iron ore pellets dry;
(4) steam after high temperature reduction in tail gas is cooled to water through hot gas interchanger 13 pairs of lump ores or iron ore pellets heat exchange, and water of condensation is back to below drip pipe 125 by high temperature hot gas admission passage 131 and condensed water elimination arm 126 and discharges.
This example carries out preheating by tail gas after high temperature reduction to the lump ore in feed bin 111 or iron ore pellets, has both utilized the heat energy of tail gas after high temperature reduction, has been minimized again simultaneously to tail gas outflow temperature after high temperature reduction, does not need to consume the extra energy, saves production cost; After reduction, moisture condensation water again can smooth discharge in tail gas, can not affect the reduction reaction of reducing gas direct-reduced iron.
In order to keep the neat and tidy of environment, the tail gas after reduction after tail gas, burning washes one's hair qualified discharge after the process of cleaner 16 purifying and cooling by tail gas water.
As shown in Figure 14, Figure 18, tail gas water washes one's hair that cleaner 16 comprises purification cylindrical shell 161, atomized spray 162, stainless steel filter wire stratum reticulare 163, tank 165, water reservoir 166, sprays water pump 167, tail gas pod 164, tail gas enter pipe 169; Purification cylindrical shell 161 top arranges exhaust port 168, and atomized spray 162, stainless steel filtration silk screen 163, tail gas pod 164, tank 165 all arrange in purification cylindrical shell 161; Water reservoir 166, sprinkling water pump 167 all arrange outside purification cylindrical shell 161; Tank 165 arranges the bottom of purification cylindrical shell 161, spoil disposal pipeline 1650 is provided with bottom tank 165, tail gas pod 164 is arranged on the top of tank 165, tail gas pod 164 connects tail gas and enters pipe 169, tail gas enters the top that pipe 169 one end is arranged on tank 165, tail gas enter pipe 169 the other end pass purification cylindrical shell 161 communicate with the external world; Stainless steel filter wire stratum reticulare 163 is provided with above tail gas pod 164, above stainless steel filter wire stratum reticulare 163, atomized spray 162 is set, atomized spray 162 is connected on water inlet pipe 1601, water inlet pipe 1601 stretches out outside purification cylindrical shell 161 to be connected with water inlet bustle pipe 1602, water inlet bustle pipe 1602 is purify cylindrical shell 161 periphery in the form of a ring around the home, water inlet bustle pipe 1602 is connected with sprinkling water pump 167 by water inlet supervisor 160, spray water pump 167 and be connected to water absorption tube 1603, water absorption tube 1603 stretches in water reservoir 166; Water reservoir 166 is also communicated with tank 165 through purification cylindrical shell 161 by communicating pipe 1604.
As shown in figure 14, access opening 1611 is offered at purification cylindrical shell 161 wall above stainless steel filter wire stratum reticulare 163, one is facilitate workman to enter in purification cylindrical shell 161 atomized spray 162 damaged, stainless steel filter wire stratum reticulare 163 keeps in repair, two is regularly can remove the plaster of alluvial on stainless steel filter wire stratum reticulare 163 by artificial, purification cylindrical shell 161 wall above tank 165 offers water-in 1612, by injecting clean water in water-in 162 pairs of tanks 165, to change the sewage of dust suction in tank 165, offer into water overflow port 1613 at purification cylindrical shell 161 wall near tank 165 edge, the unnecessary water of tank 165 can be discharged from here, the water in tank 165 is avoided to flood the opening of tail gas pod 164 too much, cause tail gas to enter to be obstructed.
As Figure 18, shown in Figure 14, for to filtering dust in tail gas better, multiple atomized spray 162 161 to be arranged in the form of a ring in purification cylindrical shell, stretched out outside purification cylindrical shell 161 by many water inlet pipes 1601 and connect with water inlet bustle pipe 1602, in addition can also in purification cylindrical shell 161 from bottom to top interval many group atomized spray 162 are set, stainless steel filter wire stratum reticulare 163, and from bottom to top, the order number of stainless steel filter wire stratum reticulare 163 increases gradually, this tail gas water washes one's hair the atomized spray 162 that cleaner 16 is provided with 3 groups, stainless steel filter wire stratum reticulare 163, this not only can obtain cleaner tail gas, and can also lower the temperature to the tail gas of heat.
As shown in figure 13, spray water pump 167 and be connected with industry control center 90, automatically control the work of spraying water pump 167 by industry control center 90.
The Principle Method that this routine tail gas water washes one's hair purification is:
(1) tail gas, after burning enters pipe 169 by tail gas and enters the tail gas pod 164 purified in cylindrical shell 161, blow to the water surface in the tank 165 of below, the dust that in tail gas, particle is larger, through the absorption of flow surface, is sunk to tank 165 end in the water of immersion tank and is discharged by spoil disposal pipeline 1650;
(2) tail gas, after flow surface absorption upwards filters through stainless steel filter wire stratum reticulare 163, elimination tail gas major part dust;
(3), after stainless steel filter wire stratum reticulare 163 filters tail gas enters the water smoke layer that atomized spray 162 water spray is formed again, through exhaust port 168 qualified discharge of water smoke layer cleaning by purification cylindrical shell 161 top in tail gas.
In order to allow discharge tail gas in dustiness be reduced to minimum, on it, (3) supplements further and is: after stainless steel filter wire stratum reticulare 163 filters, tail gas enters the water smoke layer that atomized spray 162 is formed again, the stainless steel filter wire stratum reticulare 163 upwards entering order number larger in tail gas after the cleaning of water smoke layer filters again, the water smoke layer cleaning that atomized spray 162 is formed above the stainless steel filter wire stratum reticulare 163 that this order number is larger again, finally by exhaust port 168 qualified discharge at purification cylindrical shell 161 top.
Part III lump ore or iron ore pellets reduction are sent out should
First segment lump ore or iron ore pellets heating
As shown in Figure 1, reducing apparatus 6 is arranged in the middle part of body of heater 91, mainly comprises reduction room 61, outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67, gas reversing system 66, central supported bow 65, as Fig. 7, Fig. 8, shown in Fig. 9: reduction room 61 is by fire-resistant thermally conductive material, outer ring wall 612, 611 form an annulus, reduction top, room 61 with enter stove cloth passage 921 and communicate, being centered around the outdoor wall 611 ring periphery of reduction is outer gas-operated thermal bath facility 64, indoor ringwall 612 ring that reduces is interior is interior gas-operated thermal bath facility 67, and wherein outer gas-operated thermal bath facility 64 is mainly first combustion heater 62 of some groups of (this example 9 groups) identical associations of structure, second combustion heater 60 is formed, as Fig. 1, Fig. 8, shown in Fig. 9: could reduce because lump ore or iron ore pellets need to reach certain temperature, reduction room 61 is divided into epimere preheating from top to bottom, heating is continued in stage casing, hypomere is mainly reduction reaction three phases, so reduction room 61 is highly designed higher, corresponding outer gas-operated thermal bath facility 64 is also mainly divided into, in, lower Three-section type heating, every section of first combustion heater 62 by 9 groups of identical associations of structure, second combustion heater 60 is formed, and interior gas-operated thermal bath facility 67 is mainly divided into, lower two-section type heating, every section by 6 groups of identical 3rd combustion heaters 68 mutually of structure, 4th combustion heater 69 is formed.
As Fig. 1, Fig. 9 show, the first described combustion heater 62 mainly comprises the first combustion chamber 621, first coal gas and enters arm 622 and the first regenerative heat exchanger 624, first coal gas and enter arm 622 and lead in the first combustion chamber 621 through body of heater 91 exterior wall.
As shown in Fig. 1, Fig. 9: body of heater 91 exterior wall that the first combustion chamber 621 is built into by refractory materials and fire-resistant thermally conductive material are built into the outdoor ringwall 611 of reduction and outer quirk partition wall 625 surrounds the gas-fired quirk of a relative closure.
As shown in Fig. 1, Fig. 9, the first regenerative heat exchanger 624 comprises the first thermal 626, first heat storage 623, first air and enters arm 627 and the first combustion exhaust exhaust outlet 628; First thermal 626 is arranged in body of heater 91 exterior wall, first heat storage 623 arranges in the first thermal 626, first thermal 626 one end is led to bottom the first combustion chamber 621, and the other end is connected to the first air respectively and enters arm 627 and the first combustion exhaust exhaust outlet 628.
As shown in Figure 9, enter at the first air and to be provided with the first one-way air valve 629, first one-way air valve 629 between arm 627 and the first thermal 626 and to allow air to enter pipe 627 from the first air and the first thermal 626 flows into the first combustion chamber 621; The first unidirectional waste gas valve 620 is provided with between the first combustion exhaust exhaust outlet 628 and the first thermal 626, first unidirectional waste gas valve 620 allows gas-fired waste gas to flow through the first thermal 626 from the first combustion chamber 621, finally discharge (certainly from the first combustion exhaust exhaust outlet 628, adopt gas reversing system 66 as described below, when air supervisor 667 and the first air are in charge of 6671 connections, air supervisor 667 and the second air are in charge of 6673 and are in cut-out; Meanwhile, combustion exhaust supervisor 669 is in charge of 6691 with the first combustion exhaust and also cuts off mutually, and corresponding combustion exhaust supervisor 669 and the second combustion exhaust are in charge of 6693 and are in and are connected, the effect of replacement first one-way air valve 629 and the first unidirectional waste gas valve 620 can be played).
In like manner, as shown in Figure 9: identical second combustion heater 60 of structure mainly comprises the second combustion chamber 601, second coal gas and enters arm 602 and the second regenerative heat exchanger 604.
As shown in Figure 9: body of heater 91 exterior wall that the second combustion chamber 601 is built into by refractory materials and fire-resistant thermally conductive material are built into the outdoor ringwall 611 of reduction and outer quirk partition wall 625 surrounds the gas-fired quirk of a relative closure.
As shown in Fig. 1, Fig. 9: the second coal gas enters arm 602 and leads in the second combustion chamber 601 through body of heater 91 exterior wall.
As shown in Figure 9: the second regenerative heat exchanger 604 comprises the second thermal 606, second heat storage 603, second air enters arm 607 and the second combustion exhaust exhaust outlet 608, second thermal 606 is arranged in body of heater 91 exterior wall, second heat storage 603 arranges in the second thermal 606, second thermal 606 one end is led to bottom the second combustion chamber 601, the other end is connected to the second air respectively and enters arm 607 and the second combustion exhaust exhaust outlet 608, enter between arm 607 and the second thermal 606 at the second air and be provided with the second one-way air valve 609, second one-way air valve 609 allows air to enter pipe 607 from the second air and the second thermal 606 flows into the second combustion chamber 601, the second unidirectional waste gas valve 600 is provided with between the second combustion exhaust exhaust outlet 608 and the second thermal 606, second unidirectional waste gas valve 600 allows gas-fired waste gas to flow through the second thermal 606 from the second combustion chamber 601, finally discharge (certainly from the second combustion exhaust exhaust outlet 608, adopt gas reversing system 66 as described below, when air supervisor 667 and the first air are in charge of 6671 cut-outs, air supervisor 667 and the second air are in charge of 6673 and are in connection, meanwhile, combustion exhaust supervisor 669 and the first combustion exhaust are in charge of 6691 and are also connected, and corresponding combustion exhaust supervisor 669 is in charge of 6693 with the second combustion exhaust and also cuts off mutually, the effect of replacement second one-way air valve 609 and the second unidirectional waste gas valve 600 can be played).
As shown in Fig. 1, Fig. 8, between second combustion chamber 601 of the first combustion chamber 621 and next-door neighbour, the top of outer quirk partition wall 625 is provided with combustion chamber through hole 6251, first combustion chamber 621 and second combustion chamber 601 of next-door neighbour are connected to form and are associated one group by combustion chamber through hole 6251, this example China and foreign countries gas-operated thermal bath facility 64 is provided with quirk partition wall 625 outside 18 roads altogether, forms 9 groups of association burning groups; In addition, as shown in Figure 1; Because reduction room 61 is highly higher, wherein outer gas-operated thermal bath facility 64 is mainly divided into upper, middle and lower segment formula and heats, and every section identical and associate the first combustion heater 62, second combustion heater 60 and form by 9 groups of structures.
As shown in Figure 1: on body of heater 91 exterior wall, each combustion chamber is also provided with chamber temperature monitoring holes 6201 and combustion chamber spy hole 6202, combustion chamber spy hole 6202 is convenient to the gas-fired situation that technician directly observes each combustion chamber, chamber temperature table 6203 is provided with for the temperature monitoring to combustion chamber, so that the assessment to lump ore or iron ore pellets process in chamber temperature monitoring holes 6201.
As Figure 13 shows: chamber temperature table 6203 and industry control center 90 are connected, automatically gathered the temperature data of chamber temperature table 6203 by industry control center 90.
As Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, gas reversing system 66 comprises dish 661, lower wall 662, rotate reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666, lower wall 662 is connected to an air supervisor 667 respectively and the first air is in charge of 6671, second air is in charge of 6673, a coal gas supervisor 668 and the first gas manifold 6681, second gas manifold 6683, a combustion exhaust supervisor 669 and the second combustion exhaust are in charge of 6693, first combustion exhaust is in charge of 6691, wherein, second combustion exhaust be in charge of 6693 and first combustion exhaust be in charge of 6691 and first air be in charge of 6671 and second air be in charge of 6673 and first the setting of gas manifold 6681 and the second gas manifold 6683 just exchange (Fig. 2, Fig. 4, shown in Fig. 6).
As Fig. 3, Fig. 4, Fig. 5, shown in Fig. 6: upper dish 661 is fitted in above lower wall 662, upper dish 661 respectively correspondence is provided with air pipe connecting 6672, gas connection pipes 6682, combustion exhaust pipe connecting 6692, rotate reversing motor 663 drive upper dish 661 on lower wall 662 reciprocating rotation thus realize air supervisor 667 be constantly in charge of with the first air 6671 and second air be in charge of 6673 and carry out connecting and cutting off conversion, coal gas supervisor 668 constantly carries out connecting and cutting off conversion with the first gas manifold 6681 and the second gas manifold 6683, combustion exhaust supervisor 669 be constantly in charge of with the second combustion exhaust 6693 and first combustion exhaust be in charge of and 6691 carry out connecting and cut off and change (with the first air be in charge of 6671 and second air be in charge of 6673 and first the switching of gas manifold 6681 and the second gas manifold 6683 just contrary).
As shown in Fig. 1, Fig. 6, be also provided with two groups of bustle pipes in the periphery of body of heater 91, comprise the first air bustle pipe 6674, first coal gas bustle pipe 6684, first combustion exhaust bustle pipe 6694; Second air bustle pipe 6675, second coal gas bustle pipe 6685, second combustion exhaust bustle pipe 6695.
As shown in Fig. 1, Fig. 6, first air bustle pipe 6,674 first air is in charge of 6671 and first air enter arm 627 and couple together, the first air is in charge of the 6671, first air bustle pipe 6674, first air and enters arm 627, first thermal 626 and the first combustion chamber 621 forms same path;
Meanwhile, the first gas manifold 6681 and the first coal gas are entered arm 622 and couple together by the first coal gas bustle pipe 6684, the first gas manifold 6681, first coal gas bustle pipe 6684, first coal gas are entered arm 622 and the first combustion chamber 621 forms same path;
Simultaneously now, first combustion exhaust bustle pipe 6694 be the first combustion exhaust is in charge of 6691 and first combustion exhaust exhaust outlet 628 couple together, the first combustion exhaust is in charge of the 6691, first combustion exhaust bustle pipe 6694, first combustion exhaust exhaust outlet 628, first thermal 626 and forms same path with combustion chamber 621.
In like manner, second air bustle pipe 6,675 second air is in charge of 6673 and second air enter arm 607 and couple together, the second air is in charge of the 6673, second air bustle pipe 6675, second air and enters arm 607, second thermal 606 and the second combustion chamber 601 forms same path;
Meanwhile, the second gas manifold 6683 and the second coal gas are entered arm 602 and couple together by the second coal gas bustle pipe 6685, the second gas manifold 6683, second coal gas bustle pipe 6685, second coal gas are entered arm 602 and the second combustion chamber 601 forms same path;
Meanwhile, second combustion exhaust bustle pipe 6,695 second burning gas is in charge of 6693 and second combustion exhaust exhaust outlet 608 couple together, the second combustion exhaust is in charge of the 6693, second combustion exhaust bustle pipe 6695, second combustion exhaust exhaust outlet 608, second thermal 606 and the second combustion chamber 601 forms same path.
In addition, exhaust gas fan 666 enters pipe 169 by pipeline 6661 and tail gas and is connected, thus communicates with the tail gas pod 164 that tail gas water washes one's hair cleaner 16; Shown in Figure 13; this example also comprises gas reversing system controller 906 for controlling rotation reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666; gas reversing system electric controller 906 is connected with upper industry control center 90 again; certainly from electric control theory; rotate reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666 in this example also can directly control by industry control center 90, so arrange gas reversing system controller 906 herein do not form restriction to this routine protection domain.
Shown in as shown in Figure 1, Figure 2 ~ Fig. 5, Fig. 6, Figure 13: the heating means of this outer gas-operated thermal bath facility 64 are:
(1) industry control center 90 starts and rotates reversing motor 663 and drive upper dish 661 to rotate on lower wall 662, and air supervisor 667 and the first air are in charge of 6671 connections, air be responsible for 667 and second air be in charge of 6673 and be in dissengaged positions; Meanwhile, coal gas supervisor 668 and the first gas manifold 6681 are also connected, and coal gas supervisor 668 and the second gas manifold 6683 are in dissengaged positions; Meanwhile, combustion exhaust supervisor 669 is in charge of 6691 with the first combustion exhaust and also cuts off mutually, and corresponding combustion exhaust be responsible for 669 and second combustion exhaust be in charge of 6693 and be in the state of being connected;
(2) industry control center 90 starts air blower 664, gas fan 665, exhaust gas fan 666, air is blasted air supervisor 667 by air blower 664, air passes into air pipe connecting 6672, first air successively and is in charge of the 6671, first air bustle pipe 6674, first air and enters arm 627 and enter into the first thermal 626, enters in the first combustion chamber 621 after the heat utilizing the first heat storage 623 to discharge heats air, simultaneously, purified gas is blasted coal gas supervisor 668 by gas fan 665, coal gas enters gas connection pipes 6682 successively, first gas manifold 6681, first coal gas bustle pipe 6684, first coal gas enters arm 622 and enters in the first combustion chamber 621 and burn, meanwhile, because combustion exhaust supervisor 669 is in charge of 6691 with the first combustion exhaust and is in phase dissengaged positions, and corresponding combustion exhaust supervisor 669 and the second combustion exhaust are in charge of 6693 and are in the state of being connected, so the waste gas in the first combustion chamber 621 after gas-fired can only enter into the second combustion chamber 601 by the combustion chamber through hole 6251 on outer quirk partition wall 625 top, again in the second thermal 606, carry out after absorbing and cooling temperature from the second combustion exhaust exhaust outlet 608 through the second heat storage 603 in the second thermal 606, second combustion exhaust bustle pipe 6695, second combustion exhaust is in charge of 6693, combustion exhaust pipe connecting 6692, combustion exhaust supervisor 669 is discharged by exhaust gas fan 666,
(3) reach setting combustion time, industry control center 90 starts rotation reversing motor 663 and drives upper dish 661 to rotate backward on lower wall 662, air supervisor 667 and the first air are in charge of 6671 cut-outs, air supervisor 667 and the second air are in charge of 6673 and are in on-state, simultaneously, coal gas supervisor 668 also cuts off mutually with the first gas manifold 6681, coal gas supervisor 668 and the second gas manifold 6683 on-state, meanwhile, combustion exhaust supervisor 669 and the first combustion exhaust are in charge of 6691 and are also connected, and corresponding combustion exhaust supervisor 669 and the second combustion exhaust are in charge of 6693 also phase dissengaged positions,
(4) air is blasted air supervisor 667 by air blower 664, air passes into air pipe connecting 6672, second air successively and be in charge of the 6673, second air bustle pipe 6675, second air and enter arm 607 and enter into the second thermal 606, enters in the second combustion chamber 601 after the heat utilizing the second heat storage 603 in the second thermal 606 to discharge heats air, simultaneously, purified gas is blasted coal gas supervisor 668 by gas fan 665, coal gas enters gas connection pipes 6682 successively, second gas manifold 6683, second coal gas bustle pipe 6685, second coal gas enters arm 602 and enters in the second combustion chamber 601 and burn, meanwhile, because combustion exhaust supervisor 669 and the first combustion exhaust are in charge of 6691 and are connected, and corresponding combustion exhaust supervisor 669 and the second combustion exhaust are in charge of 6693 and are in phase dissengaged positions, so the waste gas in the second combustion chamber 601 after gas-fired can only enter in the first combustion chamber 621 by the combustion chamber through hole 6251 on outer quirk partition wall 625 top, again through the first thermal 626, after the first heat storage 603 in the first thermal 626 carries out absorbing and cooling temperature, last from the first combustion exhaust exhaust outlet 628, first combustion exhaust bustle pipe 6694, first combustion exhaust is in charge of 6691, combustion exhaust supervisor 669 is discharged by exhaust gas fan 666, so outer gas-operated thermal bath facility 64 combustion principle is when the waste gas generated after gas-fired in the first combustion chamber 621 enters the second combustion chamber 601 from combustion chamber through hole 6251, discharge after the cooling of its exhaust-heat absorption through the second heat storage 603 in the second combustion chamber 601 and the second thermal 606, otherwise, when the waste gas generated after gas-fired in the second combustion chamber 601 enters the first combustion chamber 621 from combustion chamber through hole 6251, discharge after the cooling of its exhaust-heat absorption through the first heat storage 603 in the first combustion chamber 621 and the first thermal 606.
Further: the waste gas after purified gas burning enters tail gas water by exhaust gas fan 666 and washes one's hair in cleaner 16 and carry out clean discharging after water washes one's hair purification.
In sum, this gas two by gas reversing system enters the mode of operation of the regenerative heat exchange of a mode of operation out and regenerative heat exchanger, realize the combustion heater alternate combustion of two groups of associations, namely gas reversing system sends into air, purified gas burning to the combustion chamber of the first combustion heater, hot waste gas simultaneously from the combustion chamber of the second combustion heater after sucking-off burning, the second heat storage absorbing and cooling temperature of hot waste gas in the second regenerative heat exchanger of the second combustion heater becomes the relatively low low temperature waste gas of temperature and discharges; In like manner, gas reversing system sends into air, purified gas burning to the combustion chamber of the second combustion heater, hot waste gas simultaneously from the combustion chamber of the first combustion heater after sucking-off burning, the first heat storage absorbing and cooling temperature of hot waste gas in the first regenerative heat exchanger of the first combustion heater becomes the relatively low low temperature waste gas of temperature and discharges; This mutually utilize gas-fired after waste gas residual heat carry out adding the method for warm air, both served the waste gas residual heat after to gas-fired to make full use of, improve the efficiency of combustion of the coal gas in combustion chamber, the cooling carrying out to a certain degree to the waste gas after gas-fired again, the external energy need not be consumed, play energy-saving and cost-reducing object, save lump ore or iron ore pellets reduction cost, waste gas after gas-fired can totally discharge again, carves and current environmental requirement.
Automatically controlled by the heating of external gas-operated thermal bath facility 64, reduce human cost, improve the control accuracy to lump ore or iron ore pellets process, realize automatization.
As Fig. 1, Figure 10, shown in Figure 11, interior gas-operated thermal bath facility 67 is primarily of some groups of (this example 6 groups) combustion heaters 68 that structure is identical, 69, because reduction room 61 is highly higher, interior gas-operated thermal bath facility 67 is mainly divided into, lower two-section type heating, every section has association the 3rd combustion heater 68 that 6 groups of structures are identical, 4th combustion heater 69, its composition structure and combustion principle associate the first burning heater 62 with above introduction, second burning heater 60 is almost identical, 3rd combustion heater 68 also comprises the 3rd combustion chamber 681, 3rd coal gas enters arm 682, 3rd thermal 686, 3rd heat storage 683, 3rd air enters arm 687 and the 3rd combustion exhaust exhaust outlet 688.
As shown in Fig. 1, Fig. 9, Figure 11, the 3rd combustion chamber 681 is built into the indoor ringwall 612 of reduction by fire-resistant thermally conductive material and internal-quirk partition wall 635 surrounds the gas-fired quirk of a relative closure.
As shown in Figure 1, Figure 10 shows, 3rd coal gas of hypomere enters arm 682 and upwards leads to the 3rd combustion chamber 681 from article passing beneath of bow 651 for central supported bow 65,3rd thermal 686 is arranged on the body of heater 91 below article bow 651,3rd heat storage 683 is placed in the 3rd thermal 686,3rd thermal 686 one end is led to bottom the 3rd combustion chamber 681 by extending passage 6861 from the upwards extension that passes beneath of article bow 651 of central supported bow 65, and the 3rd thermal 686 the other end is connected to the 3rd air respectively and enters arm 687 and the 3rd combustion exhaust exhaust outlet 688.
As Fig. 1, Fig. 9, shown in Figure 10, 3rd coal gas of epimere enters arm 682 and upwards leads to the 3rd combustion chamber 681 through quirk partition wall 635 from article passing beneath of bow 651 for central supported bow 65, 3rd thermal 686 is arranged on the body of heater 91 below article bow 651, 3rd heat storage 683 is placed in the 3rd thermal 686, 3rd thermal 686 one end is upwards led to bottom the 3rd combustion chamber 681 through quirk partition wall 635 extension by extending passage 6861 from the passing beneath of article bow 651 of central supported bow 65, 3rd thermal 686 the other end is connected to the 3rd air respectively and enters arm 687 and the 3rd combustion exhaust exhaust outlet 688.
In like manner, as shown in Fig. 9, Figure 10, Figure 11, the 4th combustion heater 69 structure is complete identical with the 3rd combustion heater 68, repeats no more here, wherein the 4th combustion chamber 691 and the 3rd combustion chamber 681 are connected to form by chamber passage 6305 and are associated one group, as shown in Fig. 1, Fig. 8.
Wherein, as shown in Fig. 1, Fig. 6, Figure 10,3rd coal gas of the 3rd combustion chamber 681 of the 3rd burning heater 68 enters arm 682, the 3rd air enters arm 687 and the 3rd combustion exhaust exhaust outlet 688 is in charge of the 6671, first combustion exhaust respectively by the first coal gas bustle pipe 6684, first air bustle pipe 6674, first combustion exhaust bustle pipe 6694 and the first gas manifold 6681, first air and is in charge of 6691 and communicates.
As shown in Fig. 6, Figure 10, the 4th coal gas of the 4th combustion chamber 691 of the 4th burning heater 69 enters arm 692, the 4th air enters arm 697 and the 4th combustion exhaust exhaust outlet 698 is in charge of the 6673, second combustion exhaust respectively by the second coal gas bustle pipe 6685, second air bustle pipe 6675, second combustion exhaust bustle pipe 6695 and the second gas manifold 6683, second air and is in charge of 6693 and communicates.
Here, the 3rd burning heater 68, the 4th combustion heater 69 combustion principle are almost identical with above first burning heater 62, second burning heater 60, repeat no more.
As shown in Figure 1, Figure 10 shows, central supported bow 65, because the quirk partition wall 635 of indoor ringwall 612 and combustion heating unit 67 of reducing all is arranged in furnace chamber, needs central supported to bend 65 and provide support for it, the laying of various pipeline is provided to combustion heating unit 67 again simultaneously.
As shown in Figure 1, Figure 10 shows, central supported bow 65 is arranged in the furnace chamber below reduction room 61, combustion heating unit 67, mainly comprise bar bow 651, the Huo Gong center ringwall 652 of some, bar bends 651 one end and is fixed on Huo Gong center ringwall 652, the other end is fixed on body of heater 91, bar bow 651 around ringwall 652 center, Huo Gong center at a certain angle spaced radiation shape to scatter layout, fire bow 651 in this example is 12 bows, and quantity is consistent with the 3rd burning heater 68 the 4th burning heater 69 sum that is mutually related of combustion heating unit 67.
As shown in Fig. 1, Figure 10, Fig. 9, Figure 11, article one, fiery bow in the body of wall of 651 arranges the extension passage 6861 that the 3rd coal gas enters arm 682 and the 3rd thermal 686, tightly adjacent another bar fire bends the extension passage 6961 that the 4th coal gas arranged in the body of wall of 651 enters arm 692 and the 4th thermal 696, provide convenience to the pipeline laying of combustion heating unit 67, make the various conduit arrangements of combustion heating unit 67 orderly, be unlikely to interfere.
In sum, the type of heating of reducing apparatus 6 is by outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 adopts duplex combustion chamber and commutation heating, on outer gas-operated thermal bath facility 64 points, in, lower three sections of heating, on interior gas-operated thermal bath facility 67 points, lower two sections of heating, thermal source is provided in reduction room 61, in addition, the reduction reaction of this reducing apparatus 6 is carried out in reduction indoor, room 61 separately, and reduction heating is carried out in reduction outdoor, room 61 separately, therefore be referred to as external-heat, be different from the mode that existing self-produced reducing gas produces direct-reduced iron, reduction reaction and reduction reaction are heated respectively can be continuous, controlledly to carry out, mutual coordination and don't mutually restrict, impact.
Second section reduction reaction
Because lump ore or iron ore pellets temperature in reduction room is higher, pass into reducing gas to again lump ore or iron ore pellets, reducing gas can be natural gas or manufacture reducing gas or with coke-oven gas (COG) with coal, converter gas and (or) blast furnace (BF) stock gas, the present invention mainly utilizes the charcoal in low rank coal high temperature product smokeless char and superheated vapour to meet to carry out water-gas reaction water-gas product, this water-gas product main component is H2, CO, wherein hydrogen content is high, carbon monoxide and hydrogen reasonable ratio, other component content is low, it is desirable reducing gas product, also pure hydrogen can be obtained as reducing gas by pressure-variable adsorption or membrane separation process.
As shown in Fig. 1, Figure 12, external-heat reducing gas direct-reduced iron device 7 comprises reducing apparatus 6, material cooling chamber 70, reducing gas enter siphunculus 707.
As shown in Figure 1, the reduction room 61 of reducing apparatus 6 is positioned at above central supported bow 65, outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 is placed in outside the outer ring wall 611 of reduction room 61 respectively, in interior ringwall 612, outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 purified gas burn to reduction room 61 required thermal source is provided, therefore be referred to as external-heat, certainly, if use other external heating device to reduction room 61, inner heating device is also feasible, as long as can ensure to the heat needed for the reduction of reduction room 61 and temperature, be not limited to above-mentioned outer gas-operated thermal bath facility 64, the type of heating of interior gas-operated thermal bath facility 67.
As shown in Figure 1, material cooling chamber 70 is arranged on body of heater 91 bottom and is positioned at below central supported bow 65, and the top of material cooling chamber 70 communicates with bottom reduction room 61; Reducing gas enters the top that material cooling chamber 70 is led in siphunculus 707 one end, and reducing gas enters the opening 708 downwardly material cooling chamber 70 of siphunculus 707, and the other end that reducing gas enters siphunculus 707 stretches out outside body of heater 91 for external reducing gas.
Reduction reaction Principle Method of the present invention is:
(1), enter siphunculus 707 by reducing gas and pass into reducing gas to material cooling chamber 70, reducing gas blows to material cooling chamber 70, to the high-temp solid product direct-reduced iron cooling after reduction reactions a large amount of in material cooling chamber 70, reducing gas, while giving the cooling of high-temp solid product direct-reduced iron, improves reducing gas temperature and forms high temperature reduction gas;
(2), high temperature reduction gas enters reduction room 61 through central supported bow 65, and contact with the reduction high temperature lump ore of room 61 or iron ore pellets material, carries out tail gas after reduction reaction generation high temperature reduction;
(3), above-mentioned 2nd step, reduction room 61 be heated by outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 adopts duplex combustion chamber and commutation accumulation of heat heating, the 64 points of upper, middle and lower segment heating of outer gas-operated thermal bath facility, the upper and lower two sections of heating of interior gas-operated thermal bath facility 67 points, provide institute's heat requirement to reduction reaction.
The present invention utilizes reducing gas master to be that charcoal in low rank coal high temperature product smokeless char and superheated vapour meet and carry out the water-gas of water-gas reaction generation, water-gas is heated while carrying out air cooling cooling to the high-temp solid product direct-reduced iron after reduction reaction, do not need the heating installation additionally increasing reducing gas, independent cooling system is not needed yet, save energy consumption, production cost is minimized.
Section three, after reduction, tail gas is derived
Tail gas mainly steam and carbon dioxide after the reduction of the generation after reducing gas direct-reduced iron, after reduction, the temperature of tail gas is higher, and needing derives to utilize.
As shown in Fig. 1, Fig. 7, Figure 14, after reduction, tail gas exhaust channel 85 arranges in the exterior wall of body of heater 91, communicates with the top of reduction room 61; As shown in Figure 7, after 4 reduction, tail gas exhaust channel 85 arranges in the exterior wall of body of heater 91, and after reduction, the entrance 851 of tail gas exhaust channel 85 is through leading to reduction room 61 in the middle part of outer ring wall 611, and after reduction, the exterior wall of body of heater 91 is stretched out in the outlet 852 of tail gas exhaust channel 85.
Tail gas after reduction after reduction reaction in reduction room 61 is derived from the top of reduction room 61 by this routine feature smoothly.
Section four, continuous external heating type reducing gas direct-reduced iron
Comprehensively above-mentioned, this routine feature tail gas guide after lump ore or iron ore pellets preheating, reduction reaction, reduction is gone out technique be incorporated in same body of heater, makes lump ore or iron ore pellets reduction reaction be able to continuous realization.
As shown in figure 14, continuous external heating type reducing gas direct-reduction iron furnace 9 comprises body of heater 91, pre-heating cabin 1, enters stove cloth passage 921, external-heat reducing gas direct-reduced iron device 7, tail gas exhaust channel 85, discharge with endless screw device 96 after reduction, closes finished bin 94; After pre-heating cabin 1, external-heat reducing gas direct-reduced iron device 7, reduction, the concrete structure of tail gas exhaust channel 85 is shown in the above; Pre-heating cabin 1 is arranged on body of heater 91 top, the high temperature hot gas admission passage 131 of pre-heating cabin 1 communicates with tail gas exhaust channel 85 after reduction, body of heater 91 top is provided with into stove cloth passage 921, enter stove cloth passage 921 upper end to communicate with bottom pre-heating cabin 1, enter stove cloth passage 921 lower end to communicate with the top, reduction room 61 of reducing apparatus 6, enter stove cloth passage 921 upper end and be connected with the charging valve 15 bottom the blanking bin 14 of pre-heating cabin 1.
As shown in figure 14, discharge with endless screw device 96 is arranged on bottom the material cooling chamber 70 of external-heat reducing gas direct-reduced iron device 7, closing finished bin 94 is placed in bottom body of heater 91, close in finished bin 94 and connect discharge with endless screw device 96, discharge with endless screw device 96 belongs to prior art, as the removal device on market, material returning device, blanking device etc.
The method of this routine continuous external heating type reducing gas direct-reduced iron is:
(1), by bucket elevator 18 lump ore or iron ore pellets are delivered to rotary conveyor 17, rotary conveyor 17 preheating from pre-heating cabin 1 by lump ore or iron ore pellets, then pass through stove cloth passage 921 and enter in the reduction room 61 of reducing apparatus 6;
(2), by the outer gas-operated thermal bath facility 64 of the reducing apparatus 6 of external-heat reducing gas direct-reduced iron device 7, interior gas-operated thermal bath facility 67 provide thermal source to reduction room 61 to gas-fired after purification, lump ore or iron ore pellets reduce under hot environment in reduction room 61;
(3), enter siphunculus 707 by reducing gas and pass into reducing gas to material cooling chamber 70, reducing gas blows to material cooling chamber 70, to the high-temp solid product direct-reduced iron cooling after reduction reactions a large amount of in material cooling chamber 70, reducing gas is while giving the cooling of high-temp solid product direct-reduced iron, and the temperature improving reducing gas forms high temperature reduction gas;
(4), high temperature reduction gas enters reduction room 61 through central supported bow 65, and contact with the reduction high temperature lump ore of room 61 or iron ore pellets material, carries out tail gas after reduction reaction generation high temperature reduction;
(5), tail gas after reduction is imported high temperature hot gas admission passage 131 by tail gas exhaust channel 85 after reduction and enter pre-heating cabin 1 pair of lump ore or iron ore pellets preheating, the i.e. preheating of above-mentioned 1st step, steam after high temperature reduction in tail gas is cooled to water through hot gas interchanger 13 pairs of lump ores or iron ore pellets heat exchange, and water of condensation is back to below drip pipe 125 by high temperature hot gas admission passage 131 and condensed water elimination arm 126 and discharges;
(6), according to lump ore or iron ore pellets reducing degree, reed time controll charging valve 15 opens or cuts out, and lump ore or iron ore pellets is passed through stove cloth passage 921 and enters in the reduction room 61 of reducing apparatus 6; Control discharge with endless screw device 96 to open or close, the solid product direct-reduced iron after lump ore in material cooling chamber 70 or iron ore pellets reduction cooling is entered in closed finished bin 94.
Lump ore or iron ore pellets preheating, heating, reducing process are incorporated into same body of heater by this example, and realize continuous lump ore or iron ore pellets reduction, production efficiency is high, and needed for equipment, factory building face is little, and human cost is low, has the feature of low consumption, environmental protection.
Part IV continuous external heating type reducing gas direct-reduced iron is comprehensive
First segment continuous external heating type reducing gas direct-reduced iron integration unit
As shown in figure 14, comprehensively above-mentioned, draw continuous external heating type reducing gas direct-reduced iron integration unit, comprise continuous external heating type reducing gas direct-reduction iron furnace 9, tail gas water washes one's hair cleaner 16, the exhaust gas fan 666 of the gas reversing system 66 of the reducing apparatus 6 of continuous external heating type reducing gas direct-reduction iron furnace 9 enters pipe 169 by pipeline 6661 and tail gas and is connected, thus communicates with the tail gas pod 164 that tail gas water washes one's hair cleaner 16; The drip pipe 125 of the pre-heating cabin 1 of continuous external heating type reducing gas direct-reduction iron furnace 9 discharges pipe connecting 1381 by condensed water elimination pipe connecting 1251 and cryogenic gas exhaust channel 138 by cryogenic gas, jointly stretching into tail gas water washes one's hair in the purification cylindrical shell 161 of cleaner 16, the outlet of cryogenic gas discharge pipe connecting 1381 is positioned at the below of atomized spray 162, stainless steel filter wire stratum reticulare 163, so that the emission abatement to tail gas after reduction.
So draw, continuous external heating type reducing gas direct-reduced iron integrated approach is: supplement further in the 2nd step of the method for above-mentioned continuous external heating type reducing gas direct-reduced iron and be, above-mentioned outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 adopt duplex combustion chamber and commutation heating, in reduction room 61, provide thermal source, the waste gas in outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 after purified gas burning enters tail gas water by exhaust gas fan 666 and washes one's hair in cleaner 16 and carry out clean discharging after water washes one's hair purification, supplement further in the 5th step of the method for above-mentioned continuous external heating type reducing gas direct-reduced iron and be, tail gas after reduction is derived high temperature hot gas admission passage 131 by tail gas exhaust channel 85 after reduction and enters pre-heating cabin 1 pair of lump ore or iron ore pellets preheating, the i.e. preheating of above-mentioned 1st step, steam after high temperature reduction in tail gas is cooled to water through hot gas interchanger 13 pairs of lump ores or iron ore pellets heat exchange, water of condensation is back to below drip pipe 125 by high temperature hot gas admission passage 131 and condensed water elimination arm 126, entering tail gas water by condensed water elimination pipe connecting 1251 washes one's hair in the tank 165 of cleaner 16, reduction tail gas flows into tail gas water by cryogenic gas discharge pipe connecting 1381 and washes one's hair in the purification cylindrical shell 161 of cleaner 16, through reaching clean discharge after the cleaning of water smoke layer and the filtration of stainless steel filter wire stratum reticulare 163 of atomized spray 162, protection of the environment.
Be further refined as: the 64 points of upper, middle and lower segment heating of outer gas-operated thermal bath facility, the upper and lower two sections of heating of interior gas-operated thermal bath facility 67 points, provide thermal source in reduction room 61.
The control of the comprehensive composite technology of second section continuous external heating type reducing gas direct-reduced iron
As shown in figure 13: the control device of continuous external heating type reducing gas direct-reduced iron integration unit, comprise bucket elevator 18, rotary conveyor 17, charging valve 15, discharge with endless screw device 96, the chamber temperature table 6203 of industry control center 90 and lump ore or the pre-hot feed of iron ore pellets, rotate reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666, spray water pump 167 and be connected, automatically controlled their work by industry control center 90.
The control method of continuous external heating type reducing gas direct-reduced iron integration unit is:
(1), industry control center 90 controls the lump ore that adds in the feed bin 111 of pre-heating cabin 1 or iron ore pellets pellet by bucket elevator 18, infeed belt conveyor 17, control again charging valve 15 to open or close, thus the lump ore controlled in blanking bin 14 after preheating or iron ore pellets pass through the furnace entering volume of the reduction room 61 entering reducing apparatus 6 into stove cloth passage 921;
(2), industry control center 90 is carried out comprehensive assessment lump ore or iron ore pellets reduction situation according to the temperature that chamber temperature table 6203 records and is controlled to rotate the rotational frequency of reversing motor 663 and air blower 664, gas fan 665, the external gas-operated thermal bath facility of air force 64 of exhaust gas fan 666, the gas-fired of interior gas-operated thermal bath facility 67 control, thus adjust lump ore or iron ore pellets reduction reaction;
(3), the water that the waste gas after burning in outer gas-operated thermal bath facility 64, interior gas-operated thermal bath facility 67 pumps into tail gas to be washed one's hair in cleaner 16 by exhaust gas fan 666 and is purified by industry control center 90;
(4), the pump water yield of industry control center 90 adjustment sprinkling water pump 167 realizes the purification that the waste gas after to burning pumps into tail gas, the rear tail gas of reduction.
Above content introduction just exemplifies a tool embodiment of continuous external heating type reducing gas direct-reduced iron integration unit and technique, does not form the restriction to this case continuous external heating type reducing gas direct-reduced iron integration unit and technique protection domain.

Claims (3)

1. continuous external heating type reducing gas direct-reduced iron method, is characterized in that: the method relates to that equipment comprises body of heater, pre-heating cabin, enters stove cloth passage, external-heat reducing gas direct-reduced iron device, tail gas exhaust channel, discharge with endless screw device after reduction, close finished bin; Step is:
(1), by lump ore or iron ore pellets are sent into preheating in pre-heating cabin, then pass through stove cloth passage and enter in the reduction room of the reducing apparatus of external-heat reducing gas direct-reduced iron device;
(2), adopt duplex combustion chamber and commutation accumulation of heat heating to gas-fired after purification by the outer gas-operated thermal bath facility of the reducing apparatus of external-heat reducing gas direct-reduced iron device, interior gas-operated thermal bath facility, there is provided thermal source to reduction room, lump ore or iron ore pellets reduce under hot environment in reduction room;
(3), utilize the charcoal in low rank coal high temperature product smokeless char and superheated vapour to meet and carry out water-gas reaction water-gas as reducing gas, enter siphunculus by the reducing gas of external-heat reducing gas direct-reduced iron device and pass into reducing gas to material cooling chamber, reducing gas blows to material cooling chamber, to the high-temp solid product direct-reduced iron cooling after reduction reactions a large amount of in material cooling chamber, reducing gas is while giving the cooling of high-temp solid product direct-reduced iron, and the temperature improving reducing gas forms high temperature reduction gas;
(4), high temperature reduction gas enters reduction room, and contact with the reduction high temperature lump ore of room or iron ore pellets material, carries out tail gas after reduction reaction generation high temperature reduction;
(5) after, reducing, tail gas imports pre-heating cabin to lump ore or iron ore pellets preheating by tail gas exhaust channel after reduction, the i.e. preheating of above-mentioned 1st step, steam after high temperature reduction in tail gas is cooled to water and washes one's hair cleaner through tail gas water and carry out discharging after water washes one's hair purification through heat exchange, after high temperature reduction, tail gas is washed one's hair cleaner through tail gas water and carried out discharging after water washes one's hair purification;
(6), according to lump ore or iron ore pellets reducing degree, reed time controll charging valve opens or cuts out, and lump ore or iron ore pellets is passed through stove cloth passage and enters in the reduction room of reducing apparatus; Control discharge with endless screw device to open or close, the solid product direct-reduced iron after lump ore in material cooling chamber or iron ore pellets reduction cooling is entered in closed finished bin.
2. continuous external heating type reducing gas direct-reduced iron method as claimed in claim 1, it is characterized in that: described outer gas-operated thermal bath facility adopts duplex combustion chamber and commutation accumulation of heat heating means, the method relates to equipment and comprises outer gas-operated thermal bath facility, gas reversing system, outer gas-operated thermal bath facility comprises the first combustion heater of at least one group of identical association of structure, second combustion heater, the first described combustion heater mainly comprises the first combustion chamber, first coal gas enters arm and the first regenerative heat exchanger, second combustion heater structure also comprises the second combustion chamber, second coal gas enters arm and the second regenerative heat exchanger, the step of the method is:
(1), air is blasted the first regenerative heat exchanger by gas reversing system, enter in the first combustion chamber enter heating after the first regenerative heat exchanger heating after, purified gas blasts in the first combustion chamber and burns by gas reversing system, waste gas in first combustion chamber after purified gas burning enters into the second combustion chamber, then is discharged by gas reversing system after the second regenerative heat exchanger heat absorption;
(2), reach setting combustion time, air is blasted the second regenerative heat exchanger by gas reversing system, enter in the second combustion chamber enter heating after the second regenerative heat exchanger heating after, purified gas blasts in the second combustion chamber and burns by gas reversing system, waste gas in second combustion chamber after purified gas burning enters into the first combustion chamber, then is discharged by gas reversing system after the first regenerative heat exchanger heat absorption.
3. continuous external heating type reducing gas direct-reduced iron method as claimed in claim 1, it is characterized in that: described interior gas-operated thermal bath facility adopts duplex combustion chamber and commutation accumulation of heat heating means, the method relates to equipment and comprises interior gas-operated thermal bath facility, gas reversing system, interior gas-operated thermal bath facility comprises the 3rd combustion heater of at least one group of identical association of structure, 4th combustion heater, the 3rd described combustion heater mainly comprises the 3rd combustion chamber, 3rd coal gas enters arm and the 3rd regenerative heat exchanger, 4th combustion heater structure also comprises the 4th combustion chamber, 4th coal gas enters arm and the 4th regenerative heat exchanger, the step of the method is:
(1), air is blasted the 3rd regenerative heat exchanger by gas reversing system, enter in the 3rd combustion chamber enter heating after the 3rd regenerative heat exchanger heating after, purified gas blasts in the 3rd combustion chamber and burns by gas reversing system, waste gas in 3rd combustion chamber after purified gas burning enters into the 4th combustion chamber, then is discharged by gas reversing system after the 4th regenerative heat exchanger heat absorption;
(2), reach setting combustion time, air is blasted the 4th regenerative heat exchanger by gas reversing system, enter in the 4th combustion chamber enter heating after the 4th regenerative heat exchanger heating after, purified gas blasts in the 4th combustion chamber and burns by gas reversing system, waste gas in 4th combustion chamber after purified gas burning enters into the 3rd combustion chamber, then is discharged by gas reversing system after the 3rd regenerative heat exchanger heat absorption.
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