CN106755694A - The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln - Google Patents
The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln Download PDFInfo
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- CN106755694A CN106755694A CN201710184723.5A CN201710184723A CN106755694A CN 106755694 A CN106755694 A CN 106755694A CN 201710184723 A CN201710184723 A CN 201710184723A CN 106755694 A CN106755694 A CN 106755694A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses the waste-heat recovery device and gas-based shaft kiln of a kind of gas-based shaft kiln, waste-heat recovery device includes：Heat exchange storehouse and gas passage.Heat exchange has punishment in advance chamber in storehouse, and punishment in advance chamber is respectively communicated with material inlet and material outlet.Gas passage is located in punishment in advance chamber, gas passage two ends are respectively communicated with top gas entrance and top gas outlet, and gas passage includes multiple U-shaped sections for being sequentially communicated, and U-shaped section includes bend loss and two sections of straight lengths, the two ends of bend loss connect with two straight lengths respectively, and straight length extends in the horizontal plane.The waste-heat recovery device of gas-based shaft kiln of the invention, it is possible to use the high temperature furnace top gas in gas passage is preheated to the material in punishment in advance chamber, is recycled the heat of the top gas of gas-based shaft kiln.And, multiple U-shaped sections for being sequentially communicated are set to by by gas passage, the flow and heat exchange area of top gas in gas passage are increased, so as to improve the heat exchanger effectiveness between top gas and material.
Description
Technical field
The present invention relates to metal smelt technical field, specifically, more particularly to a kind of waste heat recovery of gas-based shaft kiln is filled
Put and gas-based shaft kiln.
Background technology
Gas-based shaft kiln is the main reactor of reduced iron, is also the conventional reactor of smelting reduction process pre-reduction stage.
Thermal source is mainly derived from fresh gas heat in shaft furnace, to meet heat supply the need for, shaft furnace need to be passed through a large amount of fresh coal gas, furnace roof
Gas tapping temperature is about 450 DEG C, and about 40% energy is taken away by top gas, and heat loss is relatively large.
In correlation technique, treatment and Land use systems to top gas mainly have：By after washing, pressurized treatments, making shaft furnace
The cooling gas of bottom cooling section.Top gas after completion cooling procedure is re-used as cracking agent and mixes with natural gas, then passes to turn
Change stove and produce also Primordial Qi；After the scrubbed purification of top gas, most of gas compressor pressurizes and sends into mixing chamber with natural gas time
After receiving mixing, feeding high temperature reformation stove carries out catalytic reforming and produces also Primordial Qi, directly feeds reduction shaft furnace and uses.Least a portion of stove
Top gas sends into after mixing chamber mixes the burning outside reburner reaction tube as fuel with appropriate natural gas；Top gas is by exchanging heat
After device heat exchange cooling, through CO2 removing means and vapor humidification device, also Primordial Qi is formed with the gas mixing from reformer,
Used for shaft furnace after the common stove heat into heating.There is shaft furnace top gas sensible heat and be not utilized effectively in aforesaid way,
Cause the problem of energy waste.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art.Therefore, the present invention proposes a kind of gas
The waste-heat recovery device of base shaft furnace, the waste-heat recovery device of the gas-based shaft kiln has the advantages that simple structure, energy-conserving and environment-protective.
The present invention also proposes a kind of gas-based shaft kiln, and the gas-based shaft kiln includes the waste heat recovery of gas-based shaft kiln described above
Device.
The waste-heat recovery device of gas-based shaft kiln according to embodiments of the present invention, the gas-based shaft kiln includes body of heater and material
Storehouse, the waste-heat recovery device includes：Heat exchange storehouse, the heat exchange storehouse has material inlet, material outlet, top gas entrance and stove
Top gas is exported, and the material inlet is connected with the material bin, and the material outlet is connected with the body of heater, and the top gas enters
Mouth is connected with the exhaust outlet of the body of heater, has punishment in advance chamber, the punishment in advance chamber and the material inlet and institute in the heat exchange storehouse
Material outlet is stated to be respectively communicated with；And gas passage, the gas passage is located in the punishment in advance chamber, the gas passage two ends with
The top gas entrance and top gas outlet are respectively communicated with, and the gas passage includes multiple U-shaped sections for being sequentially communicated, institute
Stating U-shaped section includes bend loss and two sections of straight lengths, and the two ends of the bend loss connect with two straight lengths respectively, described straight
Pipeline section extends in the horizontal plane.
The waste-heat recovery device of gas-based shaft kiln according to embodiments of the present invention, it is gentle by heat exchange storehouse setting punishment in advance chamber
Body passage, it is possible to use the high temperature furnace top gas in gas passage is preheated to the material in punishment in advance chamber, thus, makes gas-based shaft kiln
The energy of high temperature furnace top gas recycled, alleviate the pressure of gas-based shaft kiln preheating section, energy-conserving and environment-protective.And, lead to
Cross and gas passage is set to multiple horizontally extending and be sequentially communicated U-shaped section, increase top gas in gas passage
Flow, and the heat exchange area of top gas and material is increased, so as to the heat that improve between top gas and material is handed over
Change efficiency.
In some embodiments of the invention, cross-sectional area of the cross-sectional area of the straight length more than the bend loss.
Thus, it is possible to prevent bend loss from interfering with punishment in advance cavity wall recurring structure, and increase the effective heat exchange area of top gas.
Alternatively, rounding off at the position being connected with the bend loss on the straight length.Thus, it is possible to reduce furnace roof
Resistance of the gas in different pipe sections transition flow, improves fluency when top gas flows in gas passage.
Some embodiments of the invention, dispersion is formed with the punishment in advance chamber at the position of the material inlet
Area.Thus, material can be evenly distributed in punishment in advance chamber by dispersion area.
In some embodiments of the invention, back taper is formed as at the position of the close described material outlet in the heat exchange storehouse
Shape, the material outlet is located at the bottom slot of the back taper.Thus, material can be concentrated along back taper wall and is flowed into
The material outlet of lower section, is easy to material to be discharged from punishment in advance chamber.
Alternatively, nozzle is provided with the position for being connected with the top gas entrance on the gas passage.Thus, it is possible to logical
Cross flow direction and the flowing velocity of Jet control top gas.
In some embodiments of the invention, the upstream of the top gas entrance is provided with the adjustable flow control valve of aperture.
Thus, it is possible to the flow of the top gas in control gas passage is adjusted by flow control valve, with right according to actual condition needs
The flow of top gas carries out precise control.
Some embodiments of the invention, the punishment in advance chamber has multiple horizontal reference planes, multiple horizontal references
Face is spaced apart along the vertical direction, and the straight length is equipped with each described horizontal reference plane, in two adjacent water
In the flat plane of reference, the straight length of one of them horizontal reference plane and the straight tube of another horizontal reference plane
Section is interspersed.Thus, it is possible to improve the space availability ratio in punishment in advance chamber, the effective heat exchange between top gas and material is increased
Area.
Further, in two adjacent horizontal reference planes, one of them horizontal reference plane it is described straight
Pipeline section is L1 with the beeline of the straight length of another horizontal reference plane, and the L1 meets：50mm≤L1≤
300mm；In the same horizontal reference plane, the distance between two adjacent straight lengths are L2, and the L2 meets：50mm
≤L2≤300mm.Thus, it is possible to increase the heat exchange area between material and top gas, so as to improve heat exchange efficiency, and it is easy to thing
Expect the flowing in punishment in advance chamber.
Gas-based shaft kiln according to embodiments of the present invention, including gas-based shaft kiln described above waste-heat recovery device.
Gas-based shaft kiln according to embodiments of the present invention, by setting waste-heat recovery device, it is possible to use the high temperature furnace of discharge
Top gas is preheated to material, alleviates the top gas dedusting cooling of gas-based shaft kiln and the pressure of material preheating section, reduces gas
The energy loss of base shaft furnace, improves energy utilization rate, energy-conserving and environment-protective.And, set along the vertical direction by punishment in advance chamber
Multi-layer U-shape section, can increase the effective heat exchange area between top gas and material, and then improve between top gas and material
Heat exchange efficiency.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the structural representation of the waste-heat recovery device of gas-based shaft kiln according to embodiments of the present invention；
Fig. 2 is the partial structural diagram of the waste-heat recovery device of gas-based shaft kiln according to embodiments of the present invention.
Reference：
Waste-heat recovery device 100,
Heat exchange storehouse 10, material inlet 101, material outlet 102, top gas entrance 110, top gas outlet 120, punishment in advance chamber
130, gas passage 140, U-shaped section 150, bend loss 151, straight length 152, rounding off portion 153, dispersion area 160, distributing device
161, discharge zone 170,
Gas-based shaft kiln 500,
Body of heater 510, exhaust outlet 511, filter 512,
Material bin 520.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " length ", " width ", " thickness ", " on ", D score,
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of and describes the present invention and simplify to describe, rather than instruction or dark
Showing the device or element of meaning must have specific orientation, with specific azimuth configuration and operation therefore it is not intended that right
Limitation of the invention.In the description of the invention, unless otherwise indicated, " multiple " is meant that two or more.
The waste-heat recovery device 100 of gas-based shaft kiln 500 according to embodiments of the present invention is described below with reference to Fig. 1 and Fig. 2.Need
It is noted that gas-based shaft kiln 500 can be used for metal smelt reactor, for example, can be used for reduced iron etc..
As depicted in figs. 1 and 2, the waste-heat recovery device 100 of gas-based shaft kiln 500 according to embodiments of the present invention, gas base is erected
Stove 500 includes body of heater 510 and material bin 520, and metal smelt process can be carried out in body of heater 510, and material bin 520 can be used for
For body of heater 510 adds materials, for example, material can be for providing acid pellet of heat etc. for gas-based shaft kiln 500.Waste heat is returned
Receiving apparatus 100 include：Heat exchange storehouse 10 and gas passage 140.
Specifically, as depicted in figs. 1 and 2, heat exchange storehouse 10 has material inlet 101 and material outlet 102, material inlet
101 are connected with material bin 520, and material outlet 102 is connected with body of heater 510.Heat exchange has punishment in advance chamber 130, punishment in advance chamber 130 in storehouse 10
It is respectively communicated with material inlet 101 and material outlet 102." connection " described here both can refer to punishment in advance chamber 130 and material
Entrance 101 is directly connected with material outlet 102, for example, shown in example in Fig. 1, the upper end in punishment in advance chamber 130 is (as shown in fig. 1
Above-below direction) connected with material inlet 101, the lower end (above-below direction as shown in Figure 1) in punishment in advance chamber 130 and material outlet
102 connections；Punishment in advance chamber 130 and material inlet 101 and the indirect communication of material outlet 102 are may also mean that, for example, can be in material
Distributing device 161 etc. is connected between entrance 101 and punishment in advance chamber 130, so that material is evenly distributed in punishment in advance chamber 130.Thus, material
In the punishment in advance chamber 130 that material in storehouse 520 can be entered into heat exchange storehouse 10 from material inlet 101, it is possible to from material outlet
102 outflow heat exchange storehouses 10 are entered into body of heater 510.
Heat exchange storehouse 10 is additionally provided with top gas entrance 110 and top gas outlet 120, top gas entrance 110 and body of heater 510
Exhaust outlet 511 is connected, and gas passage 140 is located in punishment in advance chamber 130, the two ends of gas passage 140 and top gas entrance 110 and furnace roof
Gas outlet 120 is respectively communicated with.Thus, the high temperature furnace top gas for being excluded from 500 exhaust outlet of gas-based shaft kiln 511 can be from top gas entrance
110 enter into gas passage 140, and can carry out heat exchange with the material in punishment in advance chamber 130, to transfer heat to thing
Material, preheats to material.
As depicted in figs. 1 and 2, gas passage 140 includes multiple U-shaped sections 150 for being sequentially communicated, and U-shaped section 150 includes bend pipe
Section 151 and two sections of straight lengths 152, the two ends of bend loss 151 connect with two straight lengths 152 respectively, and straight length 152 is in horizontal plane
Interior extension." horizontal plane " described here it is to be understood that it is parallel with left and right directions as shown in Figure 1 and with shown in Fig. 1
The vertical face of above-below direction.For example, shown in example in Fig. 2, straight length 152 can extend (such as institute in Fig. 2 along the longitudinal direction
The fore-and-aft direction for showing).It is understood that U-shaped section 150 of straight length 152 is set to extend in the horizontal plane, can be in mistake
(above-below direction as shown in Figure 1) interval setting is multiple U-shaped section 150 along the vertical direction in material chamber 130.Thus, by setting
Gas passage 140 is set to multiple U-shaped sections 150 for being sequentially communicated, the flow of top gas in gas passage 140 is increased, and
And the heat exchange area of top gas and material can be increased, so as to improve the heat exchanger effectiveness between top gas and material.
The waste-heat recovery device 100 of gas-based shaft kiln 500 according to embodiments of the present invention, was set by heat exchange storehouse 10
Material chamber 130 and gas passage 140, it is possible to use the high temperature furnace top gas in gas passage 140 is carried out to the material in punishment in advance chamber 130
Preheating, thus, is recycled the energy of the high temperature furnace top gas of gas-based shaft kiln 500, is alleviated gas-based shaft kiln 500 and is preheated
The pressure of section, energy-conserving and environment-protective.And, it is set to U that is multiple horizontally extending and being sequentially communicated by by gas passage 140
Type section 150, increases the flow of top gas in gas passage 140, and can increase the heat exchange face of top gas and material
Product, so as to improve the heat exchanger effectiveness between top gas and material.
In some embodiments of the invention, as depicted in figs. 1 and 2, the cross-sectional area of straight length 152 is more than bend loss
151 cross-sectional area, U-shaped section 150 of caliber is：50mm-300mm.It is understood that punishment in advance chamber 130 could be arranged to edge
It is columnar structured that above-below direction (above-below direction as shown in Figure 1) extends, and gas passage 140 is in punishment in advance chamber 130 along water
Square to (left and right directions as shown in Figure 1) extend.Because U-shaped section 150 of bend loss 151 is near the interior of punishment in advance chamber 130
Wall, thus, pipe with small pipe diameter is set to by the caliber of bend loss 151, can effectively prevent bend loss 151 and the inwall of punishment in advance chamber 130 it
Between interference.And the caliber of straight length 152 is set larger, then can effectively improve stream of the top gas in gas passage 140
Flux, to improve the heat exchange efficiency between top gas and material.
Alternatively, rounding off at the position being connected with bend loss 151 on straight length 152.As shown in Fig. 2 in straight length
152 are provided with rounding off portion 153 with the connectivity part of bend loss 151.Thus, when top gas flows into bend pipe from straight length 152
Section 151 or from bend loss 151 be flowed into straight length 152 when, rounding off portion 153 can reduce top gas different pipe sections flow
Resistance during transition, so as to increased the fluency of furnace top gas flowing in gas passage 140.
Some embodiments of the invention, dispersion area is formed with punishment in advance chamber 130 at the position of material inlet 101
160.As shown in figure 1, being set near the position of material inlet 101 in the upper end (above-below direction as shown in Figure 1) in punishment in advance chamber 130
Dispersion area 160 is equipped with, the bore of the upper end of dispersion area 160 (above-below direction as shown in Figure 1) can be less than under dispersion area 160
Hold the bore of (above-below direction as shown in Figure 1).Thus, when material enters into punishment in advance chamber 130 from material inlet 101, point
Dissipating area 160 can be such that material is uniformly distributed to punishment in advance chamber 130, be conducive to improving the heat exchange between top gas and material and imitate
Rate.Further, distributing device 161 can be provided between material inlet 101 and dispersion area 160, so that material is more uniform
Distribution to lower section (above-below direction as shown in Figure 1) punishment in advance chamber 130 in, so as to be conducive to material thermally equivalent.
In some embodiments of the invention, back taper is formed as at the position of the close material outlet 102 in heat exchange storehouse 10,
Material outlet 102 is located at the bottom slot of back taper.As shown in figure 1, punishment in advance chamber 130 lower section (as shown in Figure 1 on
Lower direction) discharge zone 170 of back taper is provided with, back taper is set to by just discharge zone 170, punishment in advance chamber 130 can be made
Interior material concentrates the material outlet 102 for flowing into lower section (above-below direction as shown in Figure 1), is conducive to material to go out from material
The outflow heat exchange of mouth 102 storehouses 10.
Alternatively, nozzle is provided with the position for being connected with top gas entrance 110 on gas passage 140.The diameter of nozzle can
Think 5mm-10mm.Thus, it is possible to pass through nozzle spray into gas passage 140 top gas, and can be by nozzle control
The flow direction and flow velocity of top gas processed, to improve the heat exchanger effectiveness between top gas and material.
In some embodiments of the invention, the upstream of top gas entrance 110 is provided with the adjustable flow control valve of aperture (figure
Not shown in).Thus, it is possible to pass through to adjust flow control valve, the size of furnace roof throughput is controlled.It should be noted that here
Described " upstream " can be understood as upstream (such as Fig. 1 that the flow direction by top gas in waste-heat recovery device 100 is understood
The flow direction of the top gas shown in middle arrow).During actual metal smelt, can according to actual industrial and mineral demand,
The size of furnace roof throughput is controlled, precise control is carried out with to the heat exchange process between top gas and material, make top gas
Heat is more fully utilized, and improves top gas sensible heat utilization rate.
Some embodiments of the invention, punishment in advance chamber 130 has multiple horizontal reference planes, and multiple horizontal reference planes are along upper
(above-below direction as shown in Figure 1) is equipped with straight length 152, adjacent every distribution between lower direction in each horizontal reference plane
Two horizontal reference planes in, the straight length 152 of one of horizontal reference plane and the straight length 152 of another horizontal reference plane
It is interspersed.As shown in figure 1, in punishment in advance chamber 130, straight length 152 is in the horizontal direction between (left and right directions as shown in Figure 1)
Every arrangement, the straight length 152 of multiple horizontally spaced arrangements is located on same horizontal plane, forms one layer U-shaped section 150.
In punishment in advance chamber 130, (above-below direction as shown in Figure 1) is intervally distributed with Multi-layer U-shape section 150, Er Qiexiang along the vertical direction
Straight length 152 is interspersed between U-shaped section 150 of adjacent two-layer.Top gas flows from the bottom to top between Multi-layer U-shape section 150 along S-shaped
Dynamic (flow direction of top gas as shown by the arrows in Figure 1).Thus, it is possible to make to form the temperature of gradient distribution in punishment in advance chamber 130
Degree field, and the confined space in punishment in advance chamber 130 can be made full use of, arrangement is multiple U-shaped section 150, to improve top gas with storeroom
Heat exchange efficiency.
Further, in two adjacent horizontal reference planes, the straight length 152 of one of horizontal reference plane with it is another
The beeline of the straight length 152 of individual horizontal reference plane is L1, and L1 meets：50mm≤L1≤300mm.By verification experimental verification, when
L1 meets：During 50mm≤L1≤300mm, can make to form the temperature field of gradient uniformity change in punishment in advance chamber 130, and be conducive to stove
Smooth outflow of the top gas in gas passage 140, makes have heat exchange efficiency higher between top gas and material.
Alternatively, in the same level plane of reference, the distance between two adjacent straight lengths 152 are L2, and L2 meets：50mm
≤L2≤300mm.By verification experimental verification, when L2 meets：50mm≤L2≤300mm.When, the space in punishment in advance chamber 130 can be improved
Utilization rate, it is possible to make material and top gas that there is good mobility.
In some examples of the invention, the height in the storehouse 10 that exchanges heat can be 3m-20m.Thus, it is possible to according to actual work
Condition demand, the number of plies of U-shaped section 150 of arrangement respective numbers in heat exchange storehouse 10, to ensure the heat exchange between top gas and material
Efficiency.
Gas-based shaft kiln 500 according to embodiments of the present invention, including above-mentioned gas-based shaft kiln 500 waste-heat recovery device 100.
Gas-based shaft kiln 500 according to embodiments of the present invention, by setting waste-heat recovery device 100, it is possible to use discharge
High temperature furnace top gas is preheated to material, alleviates the pressure of the material preheating section of gas-based shaft kiln 500, reduces gas-based shaft kiln
500 energy loss, improves energy utilization rate, energy-conserving and environment-protective.And, set along the vertical direction by punishment in advance chamber 130
Multi-layer U-shape section 150, can increase the effective heat exchange area between top gas and material, so improve top gas and material it
Between heat exchange efficiency.
Referring to Fig. 1 and Fig. 2 gas-based shaft kiln according to embodiments of the present invention is described in detail with two specific embodiments
500 waste-heat recovery device 100.It is worth understanding, it is described below to be merely illustrative, rather than to of the invention specific
Limitation.
Embodiment one：
As shown in figure 1, gas-based shaft kiln 500 includes body of heater 510 and material bin 520, body of heater 510 is used for the smelting of metal, thing
Feed bin 520 can add thermal source material for body of heater 510, for example, material can be acid pellet etc., it is metal smelt process to be used to
Middle offer heat.It is understood that during metal smelt, the top gas of generation has temperature higher, from exhaust outlet
The temperature of 511 top gases for excluding is about 450 DEG C.
The heat of the high temperature furnace top gas that waste-heat recovery device 100 can be excluded to gas-based shaft kiln 500 is recycled, and is used
To improve energy utilization rate, energy-conserving and environment-protective.As shown in figure 1, waste-heat recovery device 100 includes：Heat exchange storehouse 10 and gas passage
140。
Wherein, as shown in figure 1, the roof in gas-based shaft kiln 500 is provided with exhaust outlet 511, high temperature furnace top gas can be from row
Gas port 511 discharges gas-based shaft kiln 500.Going out in exhaust outlet 511 can be provided with filter 512, and tentatively mistake is carried out with to top gas
Filter.
As shown in figure 1, the top center in heat exchange storehouse 10 is provided with material inlet 101, and material inlet 101 and top
The material bin 520 of (above-below direction as shown in Figure 1) is connected.Lower end (the upper and lower as shown in Figure 1 of material inlet 101
To) it is dispersion area 160, the top (above-below direction as shown in Figure 1) of dispersion area 160 is provided with distributing device 161, enters from material
The materials that mouth 101 enters can be dispersed through area 160 and uniformly divide in distribution to punishment in advance chamber 130.The lower end in heat exchange storehouse 10 is (in such as Fig. 1
Shown above-below direction) back taper discharge zone 170 is formed, material outlet 102 is located at the slot of the least significant end of discharge zone 170,
Material outlet 102 is connected with gas-based shaft kiln 500, and material can be flowed into gas-based shaft kiln 500 from material outlet 102.
Heat exchange storehouse 10 is internally provided with punishment in advance chamber 130, the upper end (above-below direction as shown in Figure 1) in punishment in advance chamber 130
Connection material inlet 101, lower end (above-below direction as shown in Figure 1) the connection material outlet 102 in punishment in advance chamber 130.In punishment in advance
Gas passage 140 is provided with chamber 130, gas passage 140 includes multiple U-shaped sections 150 for being sequentially communicated, and U-shaped section 150 including curved
Pipeline section 151 and two sections of straight lengths 152, as shown in Fig. 2 cross-sectional area of the cross-sectional area of straight length 152 more than bend loss 151,
The caliber of straight length 152 is 200mm.The two ends of bend loss 151 connect with two straight lengths 152 respectively, straight length 152 and bend pipe
The connectivity part of section 151 is provided with rounding off portion 153.Straight length 152 extends in the horizontal plane, and straight length 152 is in punishment in advance chamber
Horizontally spaced distribution in 130.Multiple U-shaped sections 150 (upper and lower as shown in Figure 1 along the vertical direction in punishment in advance chamber 130
Direction) to be spaced apart be 20 layers.In U-shaped section 150 of adjacent two layers, straight length 152 is interspersed, and Multi-layer U-shape section 150 is in punishment in advance
S-type distribution in chamber 130.In same layer, adjacent two beelines of straight length 152 are L1, L1=100mm, adjacent
In U-shaped section 150 of two-layer, wherein the minimum range between one layer of straight length 152 and adjacent layer straight length 152 is L2, L2=
200mm。
The side wall lower right (direction up and down as shown in Figure 1) of the heat exchange lower end of storehouse 10 is provided with top gas entrance
110, top gas outlet 120, gas are provided with the left side wall (direction up and down as shown in Figure 1) of the heat exchange upper end of storehouse 10
Undermost U-shaped section 150 of body passage 140 is connected with top gas entrance 110, U-shaped section 150 and stove of the superiors of gas passage 140
Top gas outlet 120 is connected, and the connectivity part of top gas entrance 110 and gas passage 140 is provided with nozzle, top gas entrance 110 with
The exhaust outlet 511 of gas-based shaft kiln 500 is connected, and the upstream of top gas entrance 110 is provided with the adjustable flow control valve of aperture.Thus,
The high temperature furnace top gas discharged from the exhaust outlet 511 of gas-based shaft kiln 500 can enter into gas passage 140 from top gas entrance 110
Interior, high temperature furnace top gas flows successively through each U-shaped section 150 in the gas passage 140 from the bottom up, and with punishment in advance chamber 130 in thing
Material carries out heat exchange, is preheated with to material.
It should be noted that as shown in figure 1, the material in material bin 520 enters into punishment in advance chamber 130 from material inlet 101
Interior, material is the acid pellet to be heated of a diameter of 6mm-16mm.High temperature furnace in punishment in advance chamber 130 and in gas passage 140
Top gas carries out heat exchange, and temperature is raised.Entered into from material outlet 102 by the material (temperature is about 440 DEG C) after preheating
Inside gas-based shaft kiln 500, and the metal in gas-based shaft kiln 500 is smelted by further heating burning.
As shown in figure 1, first passing around filter from the high temperature furnace top gas (temperature is 450 DEG C or so) of the discharge of exhaust outlet 511
512 are tentatively filtered, and the main component of the high temperature furnace top gas after preliminary filtering is：H2 (38.2%), CO (20.0%), CH4
(1.9%), H2O (21.0%), CO2 (16.4%), N2 (2.5%).By the high temperature furnace top gas after preliminary filtering with
The flow of 666735Nm3/h is entered into gas passage 140 from top gas entrance 110 through nozzle, and high temperature furnace top gas is logical in gas
Flowing in road 140, and carry out heat and will change with the material in punishment in advance chamber 130, to transfer heat to material, material is carried out pre-
Heat.Thus, recycled the preheating of top gas.By the top gas after heat exchange, (temperature reduction is for about 182
DEG C), finally from the discharge heat exchange storehouse 10 of top gas outlet 120.Heat-insulation layer is provided with the perisporium in heat exchange storehouse 10, to prevent heat exchange
Heat in storehouse 10 scatters and disappears, and causes energy waste.
It is understood that top gas in the gas passage 140 along Multi-layer U-shape section 150 from bottom to up (as shown in fig. 1
Above-below direction) flow process in carry out heat exchange with material, different zones form the different temperature of temperature in heat exchange storehouse 10
Degree field.As shown in figure 1, in the bottom in punishment in advance chamber 130, temperature is 400 DEG C -450 DEG C；At the middle part of punishment in advance chamber 130, temperature is 350
℃-375℃；On the top in punishment in advance chamber 130, temperature is 150 DEG C -170 DEG C.The temperature of dispersion area 160 is 30 DEG C, dispersion area 160
Temperature be 442 DEG C.The temperature in the temperature field of different zones can be by adjusting between U-shaped section 150 of the number of plies, straight length 152
Spacing and furnace roof throughput etc. are realized.
Thus, punishment in advance chamber 130 and gas passage 140 are set by heat exchange storehouse 10, it is possible to use in gas passage 140
High temperature furnace top gas the material in punishment in advance chamber 130 is preheated, thus, make the energy of the high temperature furnace top gas of gas-based shaft kiln 500
Recycled, alleviated the pressure of the preheating section of gas-based shaft kiln 500, energy-conserving and environment-protective.And, by by gas passage 140
Multiple U-shaped sections 150 for being sequentially communicated are set to, the flow of top gas in gas passage 140 is increased, and furnace roof can be increased
The heat exchange area of gas and material, so as to improve the heat exchanger effectiveness between top gas and material.
Embodiment two：
From unlike embodiment one, in this embodiment, high temperature furnace top gas is flowed into the flow of 568767Nm3/h and changed
In hot storehouse 10.(above-below direction as shown in Figure 1) is intervally distributed with 40 layers U-shaped section along the vertical direction in punishment in advance chamber 130
150, in same layer, the distance between two adjacent straight lengths 152 are L1, L1=100mm.U-shaped section 150 of adjacent two-layer
In, wherein the distance between one layer of straight length 152 straight length 152 adjacent with another layer is L2, L2=100mm.Heat exchange storehouse 10
The thermo parameters method in interior each region is：In the bottom of punishment in advance chamber 130, temperature is 443 DEG C -448 DEG C；At the middle part of punishment in advance chamber 130, temperature
It is 360 DEG C -372 DEG C；On the top in punishment in advance chamber 130, temperature is 101 DEG C -125 DEG C.The temperature of dispersion area 160 is 25 DEG C, discharging
The temperature in area 170 is 445 DEG C.
Thus, by increasing U-shaped section 150 of gas passage 140 (above-below direction as shown in Figure 1) along the vertical direction
The number of plies, increases the heat exchange area between top gas and material, reduces the flow of warm high temperature top gas.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example are described
Structure, material or feature are contained at least one embodiment of the invention or example.In this manual, to above-mentioned term
Schematic representation is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or spy
Point can in an appropriate manner be combined in one or more any embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
Can these embodiments be carried out with various changes, modification, replacement and modification in the case of departing from principle of the invention and objective, this
The scope of invention is limited by claim and its equivalent.
Claims (10)
1. a kind of waste-heat recovery device of gas-based shaft kiln, it is characterised in that the gas-based shaft kiln includes body of heater and material bin,
The waste-heat recovery device includes：
There is material inlet, material outlet, top gas entrance and top gas to export in heat exchange storehouse, the heat exchange storehouse, and the material enters
Mouthful connected with the material bin, the material outlet is connected with the body of heater, the exhaust of the top gas entrance and the body of heater
Mouth connection, has punishment in advance chamber in the heat exchange storehouse, the punishment in advance chamber is respectively communicated with the material inlet and the material outlet；
With
Gas passage, the gas passage is located in the punishment in advance chamber, the gas passage two ends and the top gas entrance and
The top gas outlet is respectively communicated with, and the gas passage includes multiple U-shaped sections for being sequentially communicated, and described U-shaped section includes bend pipe
Section and two sections of straight lengths, the two ends of the bend loss connect with two straight lengths respectively, and the straight length is in the horizontal plane
Extend.
2. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that the cross section of the straight length
Cross-sectional area of the product more than the bend loss.
3. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that on the straight length with it is described
Rounding off at the position of bend loss connection.
4. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that near institute in the punishment in advance chamber
State and dispersion area is formed with the position of material inlet.
5. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that the close institute in the heat exchange storehouse
State and be formed as back taper at the position of material outlet, the material outlet is located at the bottom slot of the back taper.
6. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that with institute on the gas passage
Nozzle is provided with the position for stating the connection of top gas entrance.
7. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that the top gas entrance it is upper
Trip is provided with the adjustable flow control valve of aperture.
8. the waste-heat recovery device of gas-based shaft kiln according to claim 1, it is characterised in that the punishment in advance chamber has multiple
Horizontal reference plane, multiple horizontal reference planes are spaced apart along the vertical direction, are all provided with each described horizontal reference plane
State straight length, in two adjacent horizontal reference planes, the straight length of one of them horizontal reference plane with it is another
The straight length of one horizontal reference plane is interspersed.
9. the waste-heat recovery device of gas-based shaft kiln according to claim 8, it is characterised in that in two adjacent water
In the flat plane of reference, the straight length of one of them horizontal reference plane and the straight tube of another horizontal reference plane
The beeline of section is L1, and the L1 meets：50mm≤L1≤300mm；
In the same horizontal reference plane, the distance between two adjacent straight lengths are L2, and the L2 meets：50mm≤
L2≤300mm。
10. a kind of gas-based shaft kiln, it is characterised in that more than the gas-based shaft kiln according to any one of claim 1-10
Heat reclamation device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184723.5A CN106755694A (en) | 2017-03-24 | 2017-03-24 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184723.5A CN106755694A (en) | 2017-03-24 | 2017-03-24 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
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| CN106755694A true CN106755694A (en) | 2017-05-31 |
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| CN201710184723.5A Pending CN106755694A (en) | 2017-03-24 | 2017-03-24 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
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|---|---|---|---|---|
| US20020078795A1 (en) * | 2000-11-08 | 2002-06-27 | Kabushiki Kaisha Kobe Seiko Sho | Method of producing direct reduced iron with use of coal-derived gas |
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| JP2012007213A (en) * | 2010-06-25 | 2012-01-12 | Mitsubishi Heavy Ind Ltd | Method for direct reduction ironmaking, and apparatus for production of reducing gas therefor |
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| CN206986207U (en) * | 2017-03-24 | 2018-02-09 | 江苏省冶金设计院有限公司 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
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2017
- 2017-03-24 CN CN201710184723.5A patent/CN106755694A/en active Pending
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| US20020078795A1 (en) * | 2000-11-08 | 2002-06-27 | Kabushiki Kaisha Kobe Seiko Sho | Method of producing direct reduced iron with use of coal-derived gas |
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