CN103409581A

CN103409581A - Continuous external heated comprehensive method for producing direct reduction iron through reduction gas

Info

Publication number: CN103409581A
Application number: CN2013103460479A
Authority: CN
Inventors: 王新民
Original assignee: Shanxi Xinli Energy Technology Co Ltd
Current assignee: Shanxi Ruide New Material Technology Co ltd
Priority date: 2013-08-10
Filing date: 2013-08-10
Publication date: 2013-11-27
Anticipated expiration: 2033-08-10
Also published as: CN103409581B

Abstract

The invention discloses a continuous external heated comprehensive method for producing direct reduction iron through reduction gas, which comprises the following steps: (1), lump ore or iron ore pellets are conveyed into a reduction chamber; (2), the purified coal gas is burnt through the adoption of duplex combustion chambers and the reversing heat storage heating method by virtue of an external fuel gas heating device and an internal fuel gas heating device so as to provide a heat source for the reduction chamber, and the burnt waste gas is exhausted after being subjected to shower purification; (3), the direct reduction iron subjected to reduction reaction is cooled through the reduction gas, and high temperature reduction gas is formed; (4), the high temperature reduction gas gets into the reduction chamber and is subjected to reduction reaction with the high temperature lump ore or iron ore pellet materials to produce high temperature reduced tail gas; (5), the reduced tail gas is led into a preheating bin to preheat the lump ore or iron ore pellets, and the preheated tail gas and condensate water are subjected to shower purification, and then are discharged; (6), according to the reduction degree of the lump ore or iron ore pellets, the lump ore or iron ore pellets are timely added into the reduction chamber of a reduction device; the solid product subjected to reduction and cooling, namely the direct reduction iron is discharged into a closed finished product bin.

Description

Continuous external heating type reducing gas direct-reduced iron integrated approach

Technical field

The present invention relates to gas base method reduced iron technology, particularly continuous external heating type reducing gas direct-reduced iron integrated approach.

Background technology

At present, produce direct-reduced iron (DRI) by using the reductive agent difference, mainly contain 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 take coke-oven gas (COG), converter gas and (or) blast furnace (BF) stock gas replaces Sweet natural gas as reductive agent and thermal source, coal-based method be take coal and is reductive agent and thermal source.Coal-based method has kinds of processes, but production efficiency is low, the investment is high, it is large to pollute, and the base method that makes to bring about the desired sensation becomes the main flow of direct reduction iron making.

Traditional gas base method be take Shaft Furnace Direct Reduction Process and is technological trend, development along with gas-based shaft kiln directly reduced technology, many technical literature introductions are now also arranged, as patent documentation CN102304599A, introduced the method and apparatus that a kind of gas base reduction shaft furnace is produced direct-reduced iron, the literature is mainly that coke-oven gas is first isolated to H2 and Lin De gas, again H2 and gas maked coal Hybrid Heating are become to reducing gas, woods moral gas is as cooling gas, the shortcoming of this technology is that H2 and gas maked coal Hybrid Heating need to be consumed to heat energy, and production cost can increase; About gas base method patent documentation such as CN1896286B, introduce the method that the self-produced reducing gas of a kind of iron ore_coal pellet is produced direct-reduced iron in addition, utilize the reducing gas of heating 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 the Primordial Qi of surviving in formation and use, the shortcoming of this technology is to produce actual being easy to of new pyrolysis gas H2, CO to generate CO2, H2O in the body of heater burning, the H2 obtained, CO seldom, are difficult to realize continuous, efficient, a large amount of reduced iron production.

Given this, the inventor has carried out deep analysis and research to gas-based shaft kiln directly reduced technique, has invented a whole set of new gas-based shaft kiln directly reduced iron composite technology technology.

Summary of the invention

The invention provides continuous external heating type reducing gas direct-reduced iron integrated approach, the method is serially connected direct-reduced iron preheating, reduction, heating and cooling, tail gas clean-up, and reduction efficiency is high, and energy consumption is little, the clean tail gas discharge, be applicable to the also original production of continuously a large amount of direct-reduced irons.

The present invention is achieved through the following technical solutions: continuous external heating type reducing gas direct-reduced iron integrated approach, the method relate to equipment and comprise that continuous external heating type reducing gas direct-reduction iron furnace, tail gas water washes one's hair cleaner; Described continuous external heating type reducing gas direct-reduction iron furnace comprises body of heater, pre-heating cabin, enters stove cloth passage, tail gas exhaust channel, discharge with endless screw device, sealing finished bin after external-heat reducing gas direct-reduced iron device, reduction; Step is:

(1), by lump ore or iron ore pellets are sent into to preheating in pre-heating cabin, then by entering stove cloth passage, enter in the reduction chamber of reducing apparatus of external-heat reducing gas direct-reduced iron device;

(2), the outer combustion gas heating unit of the reducing apparatus by external-heat reducing gas direct-reduced iron device, interior gas-operated thermal bath facility adopt duplex combustion chamber and commutation accumulation of heat heating means to burn to purified gas, thermal source is provided for the reduction chamber, lump ore or iron ore pellets reduce under hot environment in the reduction chamber, the waste gas after the purified gas burning is washed one's hair cleaner by tail gas water and carried out after water is washed one's hair purification discharging;

(3), the reducing gas by external-heat reducing gas direct-reduced iron device enters siphunculus and passes into reducing gas to material cooling chamber, reducing gas blows to material cooling chamber, to the cooling of the high-temp solid product direct-reduced iron after reduction reactions a large amount of in material cooling chamber, reducing gas is when giving the cooling of high-temp solid product direct-reduced iron, and the temperature that improves reducing gas forms high temperature reduction gas;

(4), high temperature reduction gas enters the reduction chamber, and contact with high temperature lump ore or the iron ore pellets material of reduction chamber, carries out tail gas after reduction reaction generation high temperature reduction;

(5), will reduce rear tail gas by reducing rear tail gas exhaust channel importing pre-heating cabin to lump ore or iron ore pellets preheating, it is the preheating of above-mentioned the 1st step, steam after high temperature reduction in tail gas is cooled to water and through tail gas water, washes one's hair cleaner and carry out after water is washed one's hair purification discharging through heat exchange, after high temperature reduction, other tail gas is washed one's hair cleaner through tail gas water and carried out after water is washed one's hair purification discharging;

(6), according to lump ore or iron ore pellets reducing degree, control charging valve in good time and open or close, by entering stove cloth passage, enter lump ore or iron ore pellets in the reduction chamber of reducing apparatus; Control the discharge with endless screw device and 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 the sealing finished bin.

Described outer combustion gas heating unit adopts duplex combustion chamber and commutation accumulation of heat heating means, the method relates to equipment and comprises outer combustion gas heating unit, gas reversing system, outer combustion gas heating unit comprises that the first combustion heater of at least one group of identical association of structure, the second combustion heater form, described the first combustion heater comprises that mainly the first combustion chamber, the first coal gas enter arm and the first regenerative heat exchanger, the second combustion heater structure also comprises that the second combustion chamber, the second coal gas enter arm and the second regenerative heat exchanger, and the step of the method is:

(1), the gas reversing system blasts the first regenerative heat exchanger by air, after after the first regenerative heat exchanger heating, entering heating, enter in the first combustion chamber, the gas reversing system blasts purified gas in the first combustion chamber and burns, waste gas in the first combustion chamber after the purified gas burning enters into the second combustion chamber, then by the gas reversing system, is discharged after the second regenerative heat exchanger heat absorption;

(2), reach and set combustion time, the gas reversing system blasts the second regenerative heat exchanger by air, after after the second regenerative heat exchanger heating, entering heating, enter in the second combustion chamber, the gas reversing system blasts purified gas in the second combustion chamber and burns, waste gas in the second combustion chamber after the purified gas burning enters into the first combustion chamber, then by the gas reversing system, is discharged 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 that the 3rd combustion heater of at least one group of identical association of structure, the 4th combustion heater form, described the 3rd combustion heater comprises that mainly the 3rd combustion chamber, the 3rd coal gas enter arm and the 3rd regenerative heat exchanger, the 4th combustion heater structure also comprises that the 4th combustion chamber, the 4th coal gas enter arm and the 4th regenerative heat exchanger, and the step of the method is:

(1), the gas reversing system blasts the 3rd regenerative heat exchanger by air, after after the 3rd regenerative heat exchanger heating, entering heating, enter in the 3rd combustion chamber, the gas reversing system blasts purified gas in the 3rd combustion chamber and burns, waste gas in the 3rd combustion chamber after the purified gas burning enters into the 4th combustion chamber, then by the gas reversing system, is discharged after the 4th regenerative heat exchanger heat absorption;

(2), reach and set combustion time, the gas reversing system blasts the 4th regenerative heat exchanger by air, after after the 4th regenerative heat exchanger heating, entering heating, enter in the 4th combustion chamber, the gas reversing system blasts purified gas in the 4th combustion chamber and burns, waste gas in the 4th combustion chamber after the purified gas burning enters into the 3rd combustion chamber, then by the gas reversing system, is discharged after the 3rd regenerative heat exchanger heat absorption.

Reduction of the present invention is independently carried out respectively with the reduction heating, is independent of each other, and reducing gas is directly introduced by the external world, and the reducing gas introduction volume is regulated 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; By utilizing the higher solid product of temperature after lump ore or iron ore ball reduce directly to contact and heat reduction gas with reducing gas, high-temperature tail gas after reduction carries out preheating to lump ore or the iron ore pellets that enters stove again, do not need to increase independent heating installation, the direct-reduced iron production cost is minimized, tail gas after preheating and water of condensation reach clean discharge through the cleaning that water is washed one's hair purification again, meet the theory of environmental protection that we advocate now, energy-conservation, Sustainable development.

The 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 reverser schematic diagram of the present invention.

Fig. 3 coils schematic diagram on gas reverser of the present invention.

Fig. 4 is gas reverser lower wall schematic diagram of the present invention.

Fig. 5 is A-B place cross-sectional schematic in Fig. 3.

Fig. 6 is gas reverser 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 that continuous external heating type reducing gas direct-reduced iron integration unit of the present invention forms 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 is washed one's hair cleaner is arranged schematic diagram in the form of a ring in purifying 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

By crushing and screening, select 8-30mm lump ore (raw material), screen underflow is processed into the pelletizing (raw material) of the 15mm left and right granularity of not mixing tackiness agent through the high pressure nodulizer, lump ore or iron ore pellets reduction reaction are more abundant in this size range, but this does not form the size restriction of the present invention to needed lump ore or iron ore pellets.

Second section lump ore or iron ore pellets preheating

As Figure 15, Figure 16, Figure 17, shown in Figure 14: pre-heating cabin 1 comprises housing 11, hot gas interchanger 13, blanking bin 14, drip pipe 125; In housing 11, be formed for the feed bin 111 of lump ore or iron ore pellets preheating, feed bin 111 relative closures, top only is provided with opening for feed 112,112 places are provided with rotary conveyor 17 at opening for feed, blanking bin 14 is arranged on housing 11 bottoms and communicates with feed bin 111, blanking bin 14 is for temporarily depositing lump ore or the iron ore pellets after preheating, and blanking bin 14 bottoms connect has the airtight charging valve 15 that closes function.

As Figure 14, Figure 15, Figure 16, shown in Figure 17, hot gas interchanger 13 comprises that high temperature hot gas admission passage 131, high temperature hot gas enter chamber 132, radiating pipe 133, radiating pipe serial connection passage 134, cryogenic

gas discharge chamber

136, 131 times termination drip pipes 125 of high temperature hot gas admission passage, 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 ends enter chamber 132 with high temperature hot gas and communicate, high temperature hot gas enters on the sidewall that chamber 132 is arranged on housing 21, cryogenic gas discharge chamber 136 is arranged on high temperature hot gas and enters on the relative sidewall in chamber 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 is connected with below drip pipe 125, several radiating pipe serial connection passages 134 are parallel feed bin 111 inside that are transverse in housing 11 in twos, being connected on high temperature hot gas enters between chamber 132 and cryogenic gas discharge chamber 136, one end 1341 of upper radiating pipe serial connection passage 134 and high temperature hot gas enter that chamber 132 communicates and the other end 1342 seals, one end 1341 sealings of next radiating pipe serial connection passage 134 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 " U " type, one terminates on parallel upper radiating pipe serial connection passage 134, the other end is connected on parallel next radiating pipe serial connection passage 134, parallel in twos radiating pipe serial connection passage 134 is connected mutually, be about to high temperature hot gas and

enter chamber

132 and 136 connections of cryogenic gas discharge chamber, this example arranges many radiating pipes 133 and radiating pipe serial connection passage 134, contact area with increase and lump ore or iron ore pellets, raising is to lump ore or the pre-thermo-efficiency of iron ore pellets.

As Figure 17, shown in Figure 16, U-shaped radiating pipe 133 is the inverted U interval and is connected on radiating pipe serial connection passage 134, radiating pipe serial connection passage 134 is two rows and arranges, 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 as required the lump ore of preheating or iron ore pellets the situation such as amount, humidity and temperature and determine.

As Figure 17, shown in Figure 16, U-shaped radiating pipe 133 is inverted U, and the inverted U top is wedge 1331, and this is conducive to being scattered of lump ore or iron ore pellets.

As Figure 13, shown in Figure 14, by bucket elevator 18, be placed in an end of rotary conveyor 17, the other end of rotary conveyor 17 is placed in opening for feed 112 places, bucket elevator 18, rotary conveyor 17 link with industry control center 90, are automatically controlled by the work of 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, rotary conveyor 17 by lump ore or iron ore pellets from the import 112 of the feed bin 111 of pre-heating cabin 1, being sent in feed bin 111;

(2), simultaneously tail gas after high temperature reduction is passed into to high temperature hot gas and enters in chamber 132 by reduction tail gas exhaust channel 85, high temperature hot gas admission passage 131, by radiating pipe, being connected in series passage 134 again flows in radiating pipe 133, by another the adjacent radiating pipe serial connection passage 134 be connected with radiating pipe 133, flow in cryogenic gas discharge chamber 136, last cryogenic gas exhaust channel 138 is discharged again;

(3), the lump ore after preheating or the iron ore pellets lower coal bunker 14 that finally falls into housing 11 bottoms is temporarily deposited, for lower one reducing gas direct-reduced iron operation, from and by bucket elevator 18, rotary conveyor 17, constantly to the feed bin 111 of housing 11, supplement new lump ore or iron ore pellets, realize the continuously dehydrating drying to lump ore or iron ore pellets;

(4) after high temperature reduction, the steam in tail gas is cooled to water through 13 pairs of lump ores of hot gas interchanger or iron ore pellets heat exchange, and water of condensation is back to 125 discharges of below drip pipe by high temperature hot gas admission passage 131 and condensed water elimination arm 126.

This example by high temperature reduction after tail gas the lump ore in feed bin 111 or iron ore pellets are carried out to preheating, both utilized the heat energy of tail gas after high temperature reduction, simultaneously tail gas outflow temperature after high temperature reduction is minimized again, do not need to consume the extra energy, save production cost; In the rear tail gas of reduction, the steam water of condensation can discharge again smoothly, 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 is washed one's hair cleaner 16 purifying and cooling by tail gas water and is processed rear qualified discharge.

As Figure 14, shown in Figure 180, tail gas water is washed one's hair cleaner 16 and is comprised that purification cylindrical shell 161, atomized spray 162, stainless steel filter wire stratum reticulare 163, tank 165, water reservoir 166, sprinkling water pump 167, tail gas pod 164, tail gas enter pipe 169; Purify cylindrical shell 161 tops exhaust port 168 is set, atomized spray 162, stainless steel filtration silk screen 163, tail gas pod 164, tank 165 all arrange and purify in cylindrical shell 161; Water reservoir 166, sprinkling water pump 167 all arrange and purify outside cylindrical shell 161; Tank 165 arranges the bottom that purifies cylindrical shell 161, tank 165 bottoms are provided with spoil disposal pipeline 1650, 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 pipe 169 1 ends and is arranged on the top of tank 165, and tail gas enters pipe 169 the other ends and passes and purify cylindrical shell 161 and communicate with the external world; Above tail gas pod 164, be provided with stainless steel filter wire stratum reticulare 163, 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 to purify outside cylindrical shell 161 to be connected with water inlet bustle pipe 1602, water inlet bustle pipe 1602 is for purifying around the home cylindrical shell 161 peripheries in the form of a ring, water inlet bustle pipe 1602 is responsible for 160 by water inlet and is joined with sprinkling water pump 167, spray water pump 167 and be connected to water absorption tube 1603, water absorption tube 1603 stretches in water reservoir 166; Water reservoir 166 also communicates with tank 165 by passing purification cylindrical shell 161 communicating pipe 1604.

As shown in figure 14, at purification cylindrical shell 161 walls near above stainless steel filter wire stratum reticulare 163, offer access opening 1611, the one, facilitate the workman to enter and purify the interior atomized spray 162 to damaging of cylindrical shell 161, stainless steel filter wire stratum reticulare 163 keeps in repair, the 2nd, can be regularly by the artificial plaster of alluvial on stainless steel filter wire stratum reticulare 163 of removing, purification cylindrical shell 161 walls above tank 165 offer water-in 1612, by in 162 pairs of tanks 165 of water-in, injecting clean water, so that the sewage to dust suction in tank 165 is changed, at purification cylindrical shell 161 walls near tank 165 edges, offer into water overflow port 1613, the unnecessary water of tank 165 can be discharged from here, avoid the water in tank 165 to flood too much the opening of tail gas pod 164, causing tail gas to enter is obstructed.

As Figure 18, shown in Figure 14, for to filtering better dust in tail gas, a plurality of atomized spray 162 161 are arranged in the form of a ring in purifying cylindrical shell, by many water inlet pipes 1601, stretch out to purify outside cylindrical shell 161 and connect with water inlet bustle pipe 1602, in addition can also be in purifying cylindrical shell 161 spaced many group atomized spray 162 from bottom to top, 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 is washed one's hair cleaner 16 and is provided with the atomized spray 162 of 3 groups, stainless steel filter wire stratum reticulare 163, this not only can obtain cleaner tail gas, and can also lower the temperature to hot tail gas.

As shown in figure 13, spray water pump 167 and link 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 is washed one's hair purification is:

(1), the tail gas after the 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, sinks to 165 ends of tank and discharges by spoil disposal pipeline 1650 in the water of immersion tank;

(2), the tail gas after flow surface absorption upwards filters through stainless steel filter wire stratum reticulare 163, elimination tail gas major part dust;

(3), through stainless steel filter wire stratum reticulare 163, filter after tail gas enter again the water smoke layer that atomized spray 162 water sprays form, in tail gas, clean by purifying exhaust port 168 qualified discharges at cylindrical shell 161 tops through the water smoke layer.

For allow the discharge tail gas in dustiness be reduced to minimum, on it, (3) further supplementing is: after through stainless steel filter wire stratum reticulare 163, filtering, tail gas enters the water smoke layer of atomized spray 162 formation again, in tail gas, upwards entering the stainless steel filter wire stratum reticulare 163 that the order number is larger after the water smoke layer cleans filters again again, the water smoke layer again formed through the larger stainless steel filter wire stratum reticulare 163 top atomized spray 162 of this order number cleans, finally by purifying exhaust port 168 qualified discharges at cylindrical shell 161 tops.

Third part 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 on body of heater 91 middle parts, mainly comprises reduction chamber 61, outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67, gas reversing system 66, center support bow 65, as Fig. 7, Fig. 8, shown in Figure 9: reduction chamber 61 is by fire-resistant thermally conductive material, outer ring wall 612, 611 form an annulus, reduction 61 tops, chamber with enter stove cloth passage 921 and communicate, being centered around the outdoor wall 611 ring peripheries of reduction is outer combustion gas heating unit 64, indoor ringwall 612 rings that reduce are interior is interior gas-operated thermal bath facility 67, and wherein outer combustion gas heating unit 64 is mainly first combustion heater 62 of some groups of (9 groups of this examples) identical associations of structure, the second combustion heater 60 forms, as Fig. 1, Fig. 8, shown in Figure 9: as could to reduce because lump ore or iron ore pellets need to reach certain temperature, reduction chamber 61 is divided into the epimere preheating from top to bottom, heating is continued in stage casing, hypomere is mainly the reduction reaction three phases, so reduction chamber 61 height designs are higher, corresponding outer combustion gas heating unit 64 also mainly is divided into, in, lower Three-section type heating, every section first combustion heater 62 by 9 groups of identical associations of structure, the second combustion heater 60 forms, and interior gas-operated thermal bath facility 67 mainly is divided into, lower two-section type heating, every section by 6 groups of identical the 3rd combustion heaters 68 mutually of structure, the 4th combustion heater 69 forms.

As Fig. 1, Fig. 9, show, described the first combustion heater 62 comprises that mainly the first combustion chamber 621, the first coal gas enter arm 622 and the first regenerative heat exchanger 624, the first coal gas and enters arm 622 and pass body of heater 91 exterior walls and lead in the first combustion chamber 621.

As Fig. 1, shown in Figure 9: body of heater 91 exterior walls that the first combustion chamber 621 is built into by refractory materials and fire-resistant thermally conductive material are built into the gas-fired quirk that the outdoor ringwall 611 of reduction and outer quirk partition wall 625 surround a relative closure.

As Fig. 1, shown in Figure 9, the first regenerative heat exchanger 624 comprises that the first accumulation of heat chamber 626, the first heat storage 623, the first air enter arm 627 and the first combustion exhaust exhaust outlet 628; The first accumulation of heat chamber 626 is arranged in body of heater 91 exterior walls, the first heat storage 623 arranges in the first accumulation of heat chamber 626, the first accumulation of heat chamber 626 1 ends lead to 621 bottoms, the first combustion chamber, and the other end is connected to respectively the first air and enters arm 627 and the first combustion exhaust exhaust outlet 628.

As shown in Figure 9, at the first air, enter between arm 627 and the first accumulation of heat chamber 626 and be provided with the first one-way air valve 629, the first one-way air valves 629 and allow air to enter pipe the 627 and first accumulation of heat chamber 626 from the first air to flow into the first combustion chambers 621; Between the first combustion exhaust exhaust outlet 628 and the first accumulation of heat chamber 626, be provided with the first unidirectional waste gas valve 620, the first unidirectional waste gas valve 620 allows the gas-fired waste gas first accumulation of heat chamber 626 of flowing through from the first combustion chamber 621, finally from the first combustion exhaust exhaust outlet 628, discharge (certainly, adopt gas reversing system 66 as described below, when air supervisor the 667 and first air, be in charge of 6671 and connect, air supervisor the 667 and second air is in charge of 6673 and is 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 the 669 and second combustion exhaust is in charge of 6693 and is in and is connected, can play the effect of replacement the first one-way air valve 629 and the first unidirectional waste gas valve 620).

In like manner, as shown in Figure 9: identical the second combustion heater 60 of structure comprises that mainly the second combustion chamber 601, the second coal gas enter arm 602 and the second regenerative heat exchanger 604.

As shown in Figure 9: body of heater 91 exterior walls that the second combustion chamber 601 is built into by refractory materials and fire-resistant thermally conductive material are built into the gas-fired quirk that the outdoor ringwall 611 of reduction and outer quirk partition wall 625 surround a relative closure.

As Fig. 1, shown in Figure 9: the second coal gas enters arm 602 and passes body of heater 91 exterior walls and lead in the second combustion chamber 601.

As shown in Figure 9: the second regenerative heat exchanger 604 comprises the second accumulation of heat chamber 606, the second heat storage 603, the second air enters arm 607 and the second combustion exhaust exhaust outlet 608, the second accumulation of heat chamber 606 is arranged in body of heater 91 exterior walls, the second heat storage 603 arranges in the second accumulation of heat chamber 606, the second accumulation of heat chamber 606 1 ends lead to 601 bottoms, the second combustion chamber, the other end is connected to respectively the second air and enters arm 607 and the second combustion exhaust exhaust outlet 608, at the second air, enter between arm 607 and the second accumulation of heat chamber 606 and be provided with the second one-way air valve 609, the second one-way air valve 609 allows air to enter pipe the 607 and second accumulation of heat chamber 606 from the second air and flows into the second combustion chamber 601, between the second combustion exhaust exhaust outlet 608 and the second accumulation of heat chamber 606, be provided with the second unidirectional waste gas valve 600, the second unidirectional waste gas valve 600 allows the gas-fired waste gas second accumulation of heat chamber 606 of flowing through from the second combustion chamber 601, finally from the second combustion exhaust exhaust outlet 608, discharge (certainly, adopt gas reversing system 66 as described below, when air supervisor the 667 and first air, being in charge of 6671 cuts off, air supervisor the 667 and second air is in charge of 6673 and is in connection, meanwhile, combustion exhaust supervisor the 669 and first combustion exhaust is in charge of 6691 and also is connected, and corresponding combustion exhaust supervisor 669 is in charge of 6693 also cut-outs mutually with the second combustion exhaust, can play the effect that replaces the second one-way air valve 609 and the second unidirectional waste gas valve 600).

As Fig. 1, shown in Figure 8, between the 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, combustion chamber through hole 6251 is connected the second combustion chamber 601 of the first combustion chamber 621 and next-door neighbour to form associated one group, 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 associated burning groups; In addition, as shown in Figure 1; Because reduction chamber 61 is highly higher, wherein outer combustion gas heating unit 64 mainly is divided into the upper, middle and lower segment formula and heats, and every section identical and associated the first combustion heater 62, the second combustion heater 60 form by 9 groups of structures.

As shown in Figure 1: each combustion chamber also is provided with chamber temperature monitoring holes 6201 and combustion chamber spy hole 6202 on body of heater 91 exterior walls, combustion chamber spy hole 6202 is convenient to the gas-fired situation that the technician directly observes each combustion chamber, in chamber temperature monitoring holes 6201, be provided with chamber temperature table 6203 for the temperature monitoring to combustion chamber, to the assessment of lump ore or iron ore pellets process.

As Figure 13, show: chamber temperature table 6203 links with industry control center 90, automatically gathers 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, rotation reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666, lower wall 662 is connected to respectively air supervisor 667 and first air and is in charge of 6671, the second air is in charge of 6673, coal gas supervisor 668 and first gas manifold 6681, the second gas manifold 6683, combustion exhaust supervisor 669 and second combustion exhaust is in charge of 6693, the first combustion exhaust is in charge of 6691, wherein, the second combustion exhaust is in charge of the 6693 and first combustion exhaust and is in charge of the 6691 and first air and is in charge of the 6671 and second air and is in charge of the setting of the 6673 and first gas manifold 6681 and the second gas manifold 6683 and just exchanges (Fig. 2, Fig. 4, shown in Figure 6).

As Fig. 3, Fig. 4, Fig. 5, shown in Figure 6: on coil 661 and be fitted in lower wall 662 tops, upper dish 661 correspondence respectively is provided with air pipe connecting 6672, coal gas pipe connecting 6682, combustion exhaust pipe connecting 6692, thereby rotation reversing motor 663 drives upper dish 661 reciprocating rotation on lower wall 662 and realizes that air supervisor 667 constantly is in charge of the 6671 and second air with the first air and is in charge of 6673 and connects and cut off conversion, coal gas supervisor 668 constantly connects and cuts off conversion with the first gas manifold 6681 and the second gas manifold 6683, combustion exhaust supervisor 669 constantly is in charge of the 6693 and first combustion exhaust with the second combustion exhaust and is in charge of 6691 and connects and cut off conversion (be in charge of the 6671 and second air to be in charge of the switching of the 6673 and first gas manifold 6681 and the second gas manifold 6683 just opposite with the first air).

As Fig. 1, shown in Figure 6, in the periphery of body of heater 91, also be provided with two groups of bustle pipes, comprise the first air bustle pipe 6674, the first coal gas bustle pipe 6684, the first combustion exhaust bustle pipes 6694; The second air bustle pipe 6675, the second coal gas bustle pipe 6685, the second combustion exhaust bustle pipes 6695.

As Fig. 1, shown in Figure 6, the first air bustle pipe 6674 is in charge of the 6671 and first air by the first air and is entered arm 627 and couple together, by the first air be in charge of the 6671, first air bustle pipe 6674, the first air enters arm 627, the first accumulation of heat chamber 626 and the first combustion chamber 621 and forms same path;

Meanwhile, the first coal gas bustle pipe 6684 enters arm 622 by the first gas manifold 6681 and the first coal gas and couples together, and the first gas manifold 6681, the first coal gas bustle pipe 6684, the first coal gas is entered to arm 622 and the first combustion chamber 621 forms same path;

Simultaneously now, the first combustion exhaust bustle pipe 6694 is the first combustion exhaust to be in charge of to the 6691 and first combustion exhaust exhaust outlet 628 couple together, and the first combustion exhaust is in charge of to the 6691, first combustion exhaust bustle pipe 6694, the first combustion exhaust exhaust outlet 628, the same path of the first 626Yu combustion chamber, accumulation of heat chamber 621 formation.

In like manner, the second air bustle pipe 6675 is in charge of the 6673 and second air by the second air and is entered arm 607 and couple together, by the second air be in charge of the 6673, second air bustle pipe 6675, the second air enters arm 607, the second accumulation of heat chamber 606 and the second combustion chamber 601 and forms same path;

Meanwhile, the second coal gas bustle pipe 6685 enters arm 602 by the second gas manifold 6683 and the second coal gas and couples together, and the second gas manifold 6683, the second coal gas bustle pipe 6685, the second coal gas is entered to arm 602 and the second combustion chamber 601 forms same path;

Meanwhile, the second combustion exhaust bustle pipe 6695 is in charge of the 6693 and second combustion exhaust exhaust outlet 608 by the second burning gas and is coupled together, and the second combustion exhaust is in charge of to the 6693, second combustion exhaust bustle pipe 6695, the second combustion exhaust exhaust outlet 608, the second accumulation of heat chamber 606 and the second combustion chamber 601 and forms same path.

In addition, exhaust gas fan 666 enters pipe by pipeline 6661 and tail gas and 169 is connected, thereby communicates with the tail gas pod 164 that tail gas water is washed one's hair cleaner 16; Shown in Figure 13; this example also comprises that gas reversing system controller 906 is for controlling rotation reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666; gas reversing system electric controller 906 links with upper industry control center 90 again; certainly from electric control theory; in this example, rotation reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666 are controlled by also can directly at industry control center 90, so the restriction that gas reversing system controller 906 does not form this routine protection domain is set herein.

As shown in Figure 1, Figure 2～Fig. 5, Fig. 6, shown in Figure 13: the heating means of this outer combustion gas heating unit 64 are:

(1) the industry control center 90 startup rotation reversing motors upper dish 661 of 663 drive rotations on lower wall 662, air supervisor the 667 and first air is in charge of 6671 connections, and air supervisor the 667 and second air is in charge of 6673 and is in dissengaged positions; Simultaneously, coal gas supervisor the 668 and first gas manifold 6681 also is connected, and coal gas supervisor the 668 and second gas manifold 6683 is 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 is responsible for the 669 and second combustion exhaust and is in charge of 6693 and is in the state of being connected;

(2) industry control center 90 starts air blower 664, gas fan 665, exhaust gas fan 666, air blower 664 by air blast air supervisor 667, air enter successively through air pipe connecting 6672, the first air be in charge of the 6671, first air bustle pipe 6674, the first air enters arm 627 and enters into the first accumulation of heat chamber 626, after the heat that utilizes the first heat storage 623 to discharge heats air, enter in the first combustion chamber 621, simultaneously, gas fan 665 blasts coal gas supervisor 668 by purified gas, coal gas enters coal gas pipe connecting 6682 successively, the first gas manifold 6681, the first coal gas bustle pipe 6684, the 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 the phase dissengaged positions, and corresponding combustion exhaust supervisor the 669 and second combustion exhaust is in charge of 6693 and is 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 tops, again through in the second accumulation of heat chamber 606, after the second heat storage 603 in the second accumulation of heat chamber 606 carries out absorbing and cooling temperature from the second combustion exhaust exhaust outlet 608, the second combustion exhaust bustle pipe 6695, the second combustion exhaust is in charge of 6693, combustion exhaust pipe connecting 6692, combustion exhaust supervisor 669 discharges by exhaust gas fan 666,

(3) reach and set combustion time, industry control center 90 starts the upper dish 661 of rotation reversing motor 663 drive and rotates backward on lower wall 662, air supervisor the 667 and first air is in charge of 6671 and is cut off, air supervisor the 667 and second air is in charge of 6673 and is in on-state, simultaneously, coal gas supervisor 668 also cuts off mutually with the first gas manifold 6681, coal gas supervisor the 668 and second gas manifold 6683 on-states, meanwhile, combustion exhaust supervisor the 669 and first combustion exhaust is in charge of 6691 and also is connected, and corresponding combustion exhaust supervisor the 669 and second combustion exhaust is in charge of 6693 also phase dissengaged positions,

(4) air blower 664 by air blast air supervisor 667, air enter successively through air pipe connecting 6672, the second air be in charge of the 6673, second air bustle pipe 6675, the second air enters arm 607 and enters into the second accumulation of heat chamber 606, after the heat that utilizes the second heat storage 603 in the second accumulation of heat chamber 606 to discharge heats air, enter in the second combustion chamber 601, simultaneously, gas fan 665 blasts coal gas supervisor 668 by purified gas, coal gas enters coal gas pipe connecting 6682 successively, the second gas manifold 6683, the second coal gas bustle pipe 6685, the second coal gas enters arm 602 and enters in the second combustion chamber 601 and burn, meanwhile, because combustion exhaust supervisor the 669 and first combustion exhaust is in charge of 6691 and is connected, and corresponding combustion exhaust supervisor the 669 and second combustion exhaust is in charge of 6693 and is in the phase dissengaged positions, so the waste gas in the second combustion chamber 601 after gas-fired can only enter by the combustion chamber through hole 6251 on outer quirk partition wall 625 tops in the first combustion chamber 621, again through the first accumulation of heat chamber 626, after the first heat storage 603 in the first accumulation of heat chamber 626 carries out absorbing and cooling temperature, finally from the first combustion exhaust exhaust outlet 628, the first combustion exhaust bustle pipe 6694, the first combustion exhaust is in charge of 6691, combustion exhaust supervisor 669 discharges by exhaust gas fan 666, so outer combustion gas heating unit 64 combustion principle are that 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, after the second heat storage 603 in the second combustion chamber 601 and the second accumulation of heat chamber 606 is to its exhaust-heat absorption cooling, discharge, otherwise, 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, after the first heat storage 603 in the first combustion chamber 621 and the first accumulation of heat chamber 606 is to its exhaust-heat absorption cooling, discharge.

Further: the waste gas after purified gas burning by exhaust gas fan 666 enter tail gas water wash one's hair in cleaner 16 carry out water wash one's hair purify after clean the discharge.

In sum, this gas by the gas reversing system two advances 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, be that the gas reversing system is sent into air, purified gas burning to the combustion chamber of the first combustion heater, from the hot waste gas after sucking-off burning the combustion chamber of the second combustion heater, 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 simultaneously; In like manner, the gas reversing system is sent into air, purified gas burning to the combustion chamber of the second combustion heater, from the hot waste gas after sucking-off burning the combustion chamber of the first combustion heater, 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 simultaneously; This method of mutually utilizing waste gas residual heat after gas-fired to add warm air, both played the waste gas residual heat after gas-fired had been taken full advantage of, improve the efficiency of combustion of the coal gas in combustion chamber, can carry out cooling to a certain degree to the waste gas after gas-fired again, need not consume the external energy, play energy-saving and cost-reducing purpose, save lump ore or iron ore pellets reduction cost, waste gas after gas-fired can totally discharge again, carves and current environmental requirement.

Heating by external gas-operated thermal bath facility 64 is controlled automatically, reduces human cost, has improved the control accuracy to lump ore or iron ore pellets process, realizes automatization.

As Fig. 1, Figure 10, shown in Figure 11, interior gas-operated thermal bath facility 67 is mainly by some groups of (6 groups of this examples) combustion heaters 68 that structure is identical, 69, because reduction chamber 61 is highly higher, interior gas-operated thermal bath facility 67 mainly is divided into, lower two-section type heating, every section has 6 groups of association the 3rd combustion heaters 68 that structure is identical, the 4th combustion heater 69, it forms structure and associated first burning heater 62 of combustion principle with above introduction, the second burning heater 60 is almost completely identical, the 3rd combustion heater 68 also comprises the 3rd combustion chamber 681, the 3rd coal gas enters arm 682, the 3rd accumulation of heat chamber 686, the 3rd heat storage 683, the 3rd air enters arm 687 and the 3rd combustion exhaust exhaust outlet 688.

As Fig. 1, Fig. 9, shown in Figure 11, the 3rd combustion chamber 681 is built into by fire-resistant thermally conductive material the gas-fired quirk that reduction indoor ringwall 612 and internal-quirk partition wall 635 surround a relative closure.

As shown in Figure 1, Figure 10 shows, the 3rd coal gas of hypomere enters arm 682 and passes and upwards lead to the 3rd combustion chamber 681 below the bar bow 651 of center support bow 65, the 3rd accumulation of heat chamber 686 is arranged on the body of heater 91 of bar bow 651 belows, the 3rd heat storage 683 is placed in the 3rd accumulation of heat chamber 686, the 3rd accumulation of heat chamber 686 1 ends pass to extend upward and lead to 681 bottoms, the 3rd combustion chamber by extending passage 6861 below the bar bow 651 of center support bow 65, the 3rd accumulation of heat chamber 686 the other ends are connected to respectively the 3rd air and enter arm 687 and the 3rd combustion exhaust exhaust outlet 688.

As Fig. 1, Fig. 9, shown in Figure 10, the 3rd coal gas of epimere enters arm 682 and passes upwards and lead to the 3rd combustion chamber 681 through quirk partition wall 635 below the bar bow 651 of center support bow 65, the 3rd accumulation of heat chamber 686 is arranged on the body of heater 91 of bar bow 651 belows, the 3rd heat storage 683 is placed in the 3rd accumulation of heat chamber 686, the 3rd accumulation of heat chamber 686 1 ends pass upwards and extend and lead to 681 bottoms, the 3rd combustion chamber through quirk partition wall 635 below the bar bow 651 of center support bow 65 by extending passage 6861, the 3rd accumulation of heat chamber 686 the other ends are connected to respectively the 3rd air and enter arm 687 and the 3rd combustion exhaust exhaust outlet 688.

In like manner, as Fig. 9, Figure 10, shown in Figure 11, the 4th combustion heater 69 structures are complete identical with the 3rd combustion heater 68, repeat no more here, wherein the 4th combustion chamber 691 is connected and is formed associated one group by chamber passage 6305 with the 3rd combustion chamber 681, as Fig. 1, shown in Figure 8.

Wherein, as Fig. 1, Fig. 6, shown in Figure 10, the 3rd coal gas of the 3rd combustion chamber 681 of the 3rd burning heater 68 enters arm 682, the 3rd air and enters arm 687 and the 3rd combustion exhaust exhaust outlet 688 and by the first coal gas bustle pipe 6684, the first air bustle pipe 6674, the first combustion exhaust bustle pipes 6694 and the first gas manifold 6681, the first air, be in charge of the 6671, first combustion exhaust respectively and be in charge of 6691 and communicate.

As Fig. 6, shown in Figure 10, the 4th coal gas of the 4th combustion chamber 691 of the 4th burning heater 69 enters arm 692, the 4th air and enters arm 697 and the 4th combustion exhaust exhaust outlet 698 and by the second coal gas bustle pipe 6685, the second air bustle pipe 6675, the second combustion exhaust bustle pipe 6695 and the second gas manifold 6683, the second air, be in charge of the 6673, second combustion exhaust respectively and be in charge of 6693 and communicate.

Here, the 3rd burning heater 68, the 4th combustion heater 69 combustion principle and above the first burning heater 62, the second burning heater 60 are almost completely identical, repeat no more.

As shown in Figure 1, Figure 10 shows, center support bow 65, because the quirk partition wall 635 of indoor ringwall 612 and internal combustion heating unit 67 of reducing all is arranged in furnace chamber, need center support bow 65 for it provides support, the laying of various pipelines is provided to internal combustion heating unit 67 again simultaneously.

As shown in Figure 1, Figure 10 shows, center support bow 65 is arranged in the furnace chamber of reduction chamber 61, internal combustion heating unit 67 belows, mainly comprise the bar bow 651 ,Huo Gong center ringwalls 652 of some, bar bow 651 1 ends are fixed on Huo Gong center ringwall 652, the other end is fixed on body of heater 91, bar bow 651 is the radial layout of scattering in interval at a certain angle around ringwall 652 centers, Huo Gong center, fire bow 651 in this example is 12 bows, and quantity is consistent with the 3rd burning heater 68 the 4th burning heater 69 sums that are mutually related of internal combustion heating unit 67.

As Fig. 1, Figure 10, Fig. 9, shown in Figure 11, article one, in the body of wall of fire bow 651, the extension passage 6861 that the 3rd coal gas enters arm 682 and the 3rd accumulation of heat chamber 686 is set, the 4th coal gas tightly arranged in the body of wall of another adjacent fire bow 651 enters the extension passage 6961 in arm 692 and the 4th accumulation of heat chamber 696, provide convenience for the pipeline laying of internal combustion heating unit 67, make the various conduit arrangements of internal combustion heating unit 67 orderly, be unlikely to interfere.

In sum, the type of heating of reducing apparatus 6 is by outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67 adopts duplex combustion chamber and commutation heating, on outer combustion gas heating unit 64 minutes, in, lower three sections heating, on interior gas-operated thermal bath facility 67 minutes, lower two sections heating, in reduction chamber 61, provide thermal source, in addition, chamber 61 is indoor carries out in reduction separately for the reduction reaction of this reducing apparatus 6, chamber 61 is outdoor carries out and reduction heating is separately in reduction, therefore be referred to as external-heat, be different from the mode that existing self-produced reducing gas is produced direct-reduced iron, making reduction reaction and reduction reaction heat respectively can be continuous, controlled carrying out, mutually coordinate and don't restriction mutually, impact.

The second section reduction reaction

Because lump ore or iron ore pellets temperature in the reduction chamber is higher, pass into reducing gas for 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 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 can obtain pure hydrogen as reducing gas by pressure-variable adsorption or membrane separation process.

As Fig. 1, shown in Figure 12, external-heat reducing gas direct-reduced iron device 7 comprises that reducing apparatus 6, material cooling chamber 70, reducing gas enter siphunculus 707.

As shown in Figure 1, the reduction chamber 61 of reducing apparatus 6 is positioned at center support bow 65 tops, outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67 is placed in respectively outside the outer ring wall 611 of reduction chamber 61, in interior ringwall 612, outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67 purified gas burn provides required thermal source to reduction chamber 61, therefore be referred to as external-heat, certainly, if reduction chamber 61 is used to other external heating device, inner heating device is also feasible, as long as can guarantee required heat and the temperature of reduction to reduction chamber 61, be not limited to above-mentioned outer combustion gas heating unit 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 bottoms and is positioned at center support bow 65 belows, and the top of material cooling chamber 70 communicates with reduction 61 bottoms, chamber; Reducing gas enters siphunculus 707 1 ends and leads to the top of material cooling chamber 70, and reducing gas enters the opening 708 of siphunculus 707 downwards towards material cooling chamber 70, 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), by reducing gas, enter siphunculus 707 and pass into reducing gas to material cooling chamber 70, reducing gas blows to material cooling chamber 70, to the cooling of the high-temp solid product direct-reduced iron after reduction reactions a large amount of in material cooling chamber 70, reducing gas, when giving the cooling of high-temp solid product direct-reduced iron, improves the reducing gas temperature and forms high temperature reduction gas;

(2), high temperature reduction gas passes center support bow 65 and enters reduction chamber 61, and contact with high temperature lump ore or the iron ore pellets material of reduction chamber 61, carries out tail gas after reduction reaction generation high temperature reduction;

(3), above-mentioned the 2nd step, the heating of reduction chamber 61 is adopted duplex combustion chamber and commutation accumulation of heat heating by outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67, the upper, middle and lower segment heating in 64 minutes of outer combustion gas heating unit, the upper and lower two sections heating in 67 minutes of interior gas-operated thermal bath facility, provide institute's heat requirement to reduction reaction.

It is 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 that the present invention utilizes the reducing gas master, the high-temp solid product direct-reduced iron of water-gas after to reduction reaction is heated when carrying out the air cooling cooling, do not need additionally to increase the heating installation of reducing gas, do not need independent cooling system yet, save energy consumption, production cost is minimized.

After the 3rd joint reduction, tail gas is derived

After the reduction of the generation after the reducing gas direct-reduced iron, tail gas is mainly steam and carbon dioxide, and after reduction, the temperature of tail gas is higher, needs to derive in order to utilize.

As Fig. 1, Fig. 7, shown in Figure 14, after reduction, tail gas exhaust channel 85 arranges in the exterior wall of body of heater 91, communicates with reduction 61De top, chamber; As shown in Figure 7, after 4 reduction, tail gas exhaust channel 85 arranges in the exterior wall of body of heater 91, and the entrance 851 of the rear tail gas exhaust channel 85 of reduction passes outer ring wall 611 middle parts and leads to reduction chamber 61, and after reduction, the exterior wall of body of heater 91 is stretched out in the outlet 852 of tail gas exhaust channel 85.

These routine characteristics will be in reduction chamber 61 after the reduction after reduction reaction tail gas from reduction 61De top, chamber, derive smoothly.

The 4th joint continuous external heating type reducing gas direct-reduced iron

Comprehensively above-mentioned, these routine characteristics are tail gas guide after lump ore or iron ore pellets preheating, reduction reaction, reduction to be gone out to technique be incorporated in same body of heater, make 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 comprise body of heater 91, pre-heating cabin 1, enter stove cloth passage 921, tail gas exhaust channel 85, discharge with endless screw device 96, sealing finished bin 94 after external-heat reducing gas direct-reduced iron device 7, reduction; 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 tops, 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 tops are provided with into stove cloth passage 921, entering stove cloth passage 921 upper ends communicates with pre-heating cabin 1 bottom, enter stove cloth passage 921 lower ends and communicate with 61 tops, reduction chamber of reducing apparatus 6, enter stove cloth passage 921 upper ends and be connected with the charging valve 15 of blanking bin 14 bottoms of pre-heating cabin 1.

As shown in figure 14, discharge with endless screw device 96 is arranged on material cooling chamber 70 bottoms of external-heat reducing gas direct-reduced iron device 7, sealing finished bin 94 is placed in body of heater 91 bottoms, on sealing finished bin 94, 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 from preheating pre-heating cabin 1, then enters lump ore or iron ore pellets in the reduction chamber 61 of reducing apparatus 6 by entering stove cloth passage 921;

(2), gas-fired provides thermal source for reduction chamber 61 after the 67 pairs of purifications of outer combustion gas heating unit 64, interior gas-operated thermal bath facility of the reducing apparatus 6 by external-heat reducing gas direct-reduced iron device 7, lump ore or iron ore pellets reduce under hot environment in reduction chamber 61;

(3), by reducing gas, enter siphunculus 707 and pass into reducing gas to material cooling chamber 70, reducing gas blows to material cooling chamber 70, to the cooling of the high-temp solid product direct-reduced iron after reduction reactions a large amount of in material cooling chamber 70, reducing gas is when giving the cooling of high-temp solid product direct-reduced iron, and the temperature that improves reducing gas forms high temperature reduction gas;

(4), high temperature reduction gas passes center support bow 65 and enters reduction chamber 61, and contact with high temperature lump ore or the iron ore pellets material of reduction chamber 61, carries out tail gas after reduction reaction generation high temperature reduction;

(5), will reduce after tail gas by reducing rear tail gas exhaust channel 85, import high temperature hot gas admission passages 131 and enter 1 pair of lump ore of pre-heating cabin or iron ore pellets preheating, it is the preheating of above-mentioned the 1st step, steam after high temperature reduction in tail gas is cooled to water through 13 pairs of lump ores of hot gas interchanger or iron ore pellets heat exchange, and water of condensation is back to 125 discharges of below drip pipe by high temperature hot gas admission passage 131 and condensed water elimination arm 126;

(6), according to lump ore or iron ore pellets reducing degree, control charging valve 15 in good time and open or close, by entering stove cloth passage 921, enter lump ore or iron ore pellets in the reduction chamber 61 of reducing apparatus 6; Control discharge with endless screw device 96 and 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 sealing finished bin 94.

This example is incorporated into same body of heater by lump ore or iron ore pellets preheating, heating, reducing process, realizes continuous lump ore or iron ore pellets reduction, and production efficiency is high, and the required factory building face of equipment is little, and human cost is low, has the characteristics of low consumption, environmental protection.

The 4th partial continuous external-heat 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 that 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 by pipeline 6661 and tail gas and 169 is connected, thereby communicates with the tail gas pod 164 that tail gas water is washed 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 is discharged 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 that cryogenic gas is discharged pipe connecting 1381 is positioned at the below of atomized spray 162, stainless steel filter wire stratum reticulare 163, to reducing the emission abatement of rear tail gas.

So draw, continuous external heating type reducing gas direct-reduced iron integrated approach is: in the 2nd step of the method for above-mentioned continuous external heating type reducing gas direct-reduced iron, further supplement and be, above-mentioned outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67 adopt duplex combustion chamber and commutation heating, to reduction, provide thermal source in chamber 61, the waste gas in outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67 after the purified gas burning by exhaust gas fan 666 enter tail gas water wash one's hair in cleaner 16 carry out water wash one's hair purify after clean the discharge, in the 5th step of the method for above-mentioned continuous external heating type reducing gas direct-reduced iron, further supplement and be, after reducing, tail gas is derived high temperature hot gas admission passages 131 and is entered 1 pair of lump ore of pre-heating cabin or iron ore pellets preheating by reducing rear tail gas exhaust channel 85, it is the preheating of above-mentioned the 1st step, steam after high temperature reduction in tail gas is through 13 pairs of lump ores of hot gas interchanger or iron ore pellets heat exchange and be cooled to water, water of condensation is back to below drip pipe 125 by high temperature hot gas admission passage 131 and condensed water elimination arm 126, by condensed water elimination pipe connecting 1251, entering tail gas water washes one's hair in the tank 165 of cleaner 16, reduction tail gas is discharged pipe connecting 1381 inflow tail gas water by cryogenic gas and is washed one's hair in the purification cylindrical shell 161 of cleaner 16, through after the cleaning of the water smoke layer through atomized spray 162 and 163 filtrations of stainless steel filter wire stratum reticulare, reaching clean discharge, protection of the environment.

Be further refined as: the upper, middle and lower segment heating in 64 minutes of outer combustion gas heating unit, the upper and lower two sections heating in 67 minutes of interior gas-operated thermal bath facility, provide thermal source in reduction chamber 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 that bucket elevator 18, rotary conveyor 17, charging valve 15, discharge with endless screw device 96, chamber temperature table 6203, rotation reversing motor 663, air blower 664, gas fan 665, exhaust gas fan 666, sprinkling water pump 167 that industry control center 90 and lump ore or the pre-hot feed of iron ore pellets are used link, and are controlled their work automatically 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 is controlled to the lump ore or the iron ore pellets pellet that add in the feed bin 111 of pre-heating cabin 1 by bucket elevator 18, infeed belt conveyor 17, control again charging valve 15 and open or close, by entering stove cloth passage 921, enter the furnace entering volume of the reduction chamber 61 of reducing apparatus 6 thereby control lump ore or the iron ore pellets after preheating in blanking bin 14;

(2), the temperature that records according to chamber temperature table 6203 of industry control center 90 is carried out rotational frequency and air blower 664, gas fan 665, the external gas-operated thermal bath facility 64 of air force of exhaust gas fan 666, the gas-fired of interior gas-operated thermal bath facility 67 that comprehensive assessment lump ore or iron ore pellets reduction situation control rotation reversing motor 663 and is controlled, thereby lump ore or iron ore pellets reduction reaction are adjusted;

(3), industry control center 90 water that the waste gas after burning in outer combustion gas heating unit 64, interior gas-operated thermal bath facility 67 pumped into to tail gas by exhaust gas fan 666 is washed one's hair in cleaner 16 and is purified;

(4), the pump water yield of industry control center 90 adjustment sprinkling water pumps 167 realizes the waste gas after burning is pumped into the purification of 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

1. continuous external heating type reducing gas direct-reduced iron integrated approach is characterized in that: the method relates to equipment and comprises that continuous external heating type reducing gas direct-reduction iron furnace, tail gas water washes one's hair cleaner; Described continuous external heating type reducing gas direct-reduction iron furnace comprises body of heater, pre-heating cabin, enters stove cloth passage, tail gas exhaust channel, discharge with endless screw device, sealing finished bin after external-heat reducing gas direct-reduced iron device, reduction; Step is:

2. continuous external heating type reducing gas direct-reduced iron integrated approach as claimed in claim 1, it is characterized in that: described outer combustion gas heating unit adopts duplex combustion chamber and commutation accumulation of heat heating means, the method relates to equipment and comprises outer combustion gas heating unit, the gas reversing system, outer combustion gas heating unit comprises the first combustion heater of at least one group of identical association of structure, the second combustion heater forms, described the first combustion heater mainly comprises the first combustion chamber, the first coal gas enters arm and the first regenerative heat exchanger, the second combustion heater structure also comprises the second combustion chamber, the second coal gas enters arm and the second regenerative heat exchanger, the step of the method is:

3. continuous external heating type reducing gas direct-reduced iron integrated approach 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, the gas reversing system, interior gas-operated thermal bath facility comprises the 3rd combustion heater of at least one group of identical association of structure, the 4th combustion heater forms, described the 3rd combustion heater mainly comprises the 3rd combustion chamber, the 3rd coal gas enters arm and the 3rd regenerative heat exchanger, the 4th combustion heater structure also comprises the 4th combustion chamber, the 4th coal gas enters arm and the 4th regenerative heat exchanger, the step of the method is: