CN106702143A - Efficiently-energy-saving hot air supply method for belt type roasting machine - Google Patents
Efficiently-energy-saving hot air supply method for belt type roasting machine Download PDFInfo
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- CN106702143A CN106702143A CN201710012705.9A CN201710012705A CN106702143A CN 106702143 A CN106702143 A CN 106702143A CN 201710012705 A CN201710012705 A CN 201710012705A CN 106702143 A CN106702143 A CN 106702143A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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Abstract
The invention discloses an efficiently-energy-saving hot air supply method for a belt type roasting machine and belongs to the technical field of pellet production. The method comprises the steps that the belt type roasting machine is divided into eight areas, wherein the eight areas are sequentially the air-blowing drying area, the air-drafting drying area, the preheating area, the roasting area, the heat homogenization area, the first cooling area, the second cooling area and the third cooling area; the preheating area is sequentially divided into a first preheating section and a second preheating section, and the roasting area is sequentially divided into a first roasting section, a second roasting section, a third roasting section and a fourth roasting section; hot exhaust gas generated in the second preheating section and the first roasting section is conveyed to a first cooling section; hot exhaust gas generated in the second roasting section is conveyed to the air-drafting drying area; after being gathered to a heat exchanger for heat exchange, hot exhaust gas generated in the third roasting section is conveyed to a main suction fan; and hot exhaust gas generated in the fourth roasting section and the heat homogenization area is conveyed to the preheating area. By means of the efficiently-energy-saving hot air supply method for the belt type roasting machine, according to temperature distribution of the hot exhaust gas generated in each area and the flow and temperature of the hot exhaust gas required by each area, the hot exhaust gas is reasonably distributed and utilized, and the outwards-discharging amount of the hot exhaust gas is reduced.
Description
Technical field
The present invention relates to pellet production technical field, the hot blast of more particularly to a kind of energy-efficient belt type roasting machine is supplied
To method.
Background technology
Pelletizing ore production technology is after fine grinding fine iron breeze or other iron content powders addition a small amount of additive are mixed, to add
Under conditions of water wetting, by pelletizer rolling balling, drying, preheating, roasting, soaking and cooling, being consolidated into has
The ball-type iron-bearing material of some strength and metallurgical performance.
It is many at present the green-ball that pelletizer is rolled is dried using belt type roasting machine, is preheated, be calcined, equal hot and cold
But, current belt type roasting machine is divided into seven regions, respectively forced air drying area, exhausting dry section, preheating zone, roast area,
Hot-zone, 2nd area of one area of cooling and cooling.Cool down an area and 2nd area of cooling and share a cooling blower, using 25 DEG C of air to cold
But the pelletizing in 2nd area of an area and cooling is cooled down, and the hot waste gas of 2nd area of cooling discharge delivers to air blast by blower fan and conveyance conduit
Dry section；The hot waste gas for cooling down area discharge delivers to soaking zone, roast area and preheating zone by burning machine upper cover；Roast area produces
A part of hot waste gas and soaking zone produce whole hot waste gas then deliver to exhausting dry section and preheating zone by a Fans, its
In, the heat of exhausting dry section all is from the hot waste gas of roast area and soaking zone, and the heat of preheating zone fires essentially from fuel
Burn, the hot waste gas of roast area and soaking zone mainly produces the effect of concurrent heating to preheating zone, and the combustion of preheating zone consumption is reduced with this
Doses.
At least there is problems with prior art：On the one hand, due to distribution length of the roast area on belt type roasting machine compared with
It is long, therefore the hot waste gas that roast area produces is more, and the distribution length of exhausting dry section and preheating zone is shorter, therefore, exhausting is done
Hot waste gas needed for dry area and preheating zone is also less, and the hot waste gas amount that whole roast area and soaking zone produce is more than exhausting dry section
With the hot waste gas amount needed for preheating zone, so only by roast area back segment produce hot waste gas and soaking zone produce hot waste gas conveying
To exhausting dry section and preheating zone, most of hot waste gas that the leading portion of roast area and stage casing produce is directly discharged into air, meanwhile, in advance
Whole hot waste gas that hot-zone produces also are directly discharged into air, a large amount of heat energies are not only wasted, while also polluting environment；It is another
Aspect, because the hot waste gas that roast area back segment and soaking zone produce is to be conveyed to exhausting dry section and preheating by a Fans
Area, therefore it is identical to be conveyed to the temperature of the hot waste gas of exhausting dry section and preheating zone, but exhausting dry section and preheating zone institute
The temperature of the hot waste gas for needing is different, and the temperature of the hot waste gas needed for exhausting dry section is 350 DEG C, be less than needed for preheating zone
Hot waste gas temperature, the temperature of the hot waste gas that roast area back segment and soaking zone produce takes out at 700 DEG C or so in order to meet
The demand of wind dry section reaches 350 DEG C or so, it is necessary to the hot waste gas of 700 DEG C or so collected to blower fan is blended into a large amount of cold wind
After be conveyed to exhausting dry section and preheating zone, cause the waste of heat.
The content of the invention
In order to solve whole hot waste gas and roast area leading portion, the big portion in stage casing that preheating zone present in prior art produces
Point hot waste gas is directly discharged into the energy waste that air causes and environmental pollution and blower fan is converged from roast area back segment and soaking zone
The problem of the energy waste that exhausting dry section and preheating zone are caused, this hair are conveyed to after the hot waste gas cooling for collecting 700 DEG C got up
It is bright there is provided a kind of warm-air supply method of energy-efficient belt type roasting machine, methods described includes：
Belt type roasting machine is divided into eight regions, according to stream traffic direction be followed successively by forced air drying area, exhausting dry section,
Preheating zone, roast area, soaking zone, one area of cooling, 3rd area of 2nd area of cooling and cooling；
Preheating zone is divided into two sections of preheated one-section and preheating, the temperature of two sections of preheating is higher than the temperature of preheated one-section,
Roast area is divided into four sections of one section of roasting, two sections of roasting, three sections of roasting and roasting, one section of roasting, two sections of roasting, roasting three
Section and the temperature of four sections of roasting gradually rise；
The hot waste gas that two sections and one section of generation of roasting will be preheated collects and by the first blower fan and the first conveyance conduit
It is delivered to one area of cooling；
The hot waste gas for being calcined two sections of generations is delivered to exhausting dry section by the second blower fan and the second conveyance conduit；
The hot waste gas for being calcined three sections of generations is pooled to heat exchanger, by being delivered to main exhauster after heat exchanger heat exchange；
The hot waste gas that four sections and soaking zone generation will be calcined collects and defeated by the 3rd blower fan and the 3rd conveyance conduit
Deliver to preheating zone；
Wherein, two sections of temperature ranges of the hot waste gas of generation are preheated at 300~400 DEG C, one section of hot waste gas of generation is calcined
Temperature range at 400~450 DEG C, be calcined two sections generation hot waste gas temperature ranges at 450~500 DEG C, be calcined three sections product
, at 500~600 DEG C, the temperature range of the hot waste gas that four sections of roasting and soaking zone produce is 600 for the temperature range of raw hot waste gas
~700 DEG C.
To burning gases are conveyed in the heat exchanger, the burning gases are the mixed gas of combustion gas and combustion air, to
Conveying air, burning gases and sky in the hot waste gas heat exchanging device of three sections of roasting being delivered in heat exchanger in the heat exchanger
Gas is delivered to the main exhauster after being preheated；
Burning gases after preheating are delivered to the preheating zone and the roast area respectively, are calcined when the belt is detected
When the oxygen content of machine is relatively low, the air after preheating is delivered to the preheating zone and the roast area respectively.
The heat exchanger include three output channels, respectively the first combustion gas pipe, the second combustion gas pipe and
Air duct；
First combustion gas pipe is connected with the preheating zone, for the burning gases after preheating to be delivered into the preheating
Area；
Second combustion gas pipe is connected with the roast area, for the burning gases after preheating to be delivered into the roasting
Area；
Air duct is connected with the preheating zone and the roast area respectively, for the air after preheating to be delivered to respectively
The preheating zone and the roast area.
Methods described also includes：
The hot waste gas that one area of the cooling is produced is delivered to the soaking by cooling down the belt type roasting machine upper cover in an area
Area；
The hot waste gas that 2nd area of the cooling are produced is delivered to the preheating by cooling down the belt type roasting machine upper cover in 2nd area
Area and the roast area；
The hot waste gas that 3rd area of the cooling produce is delivered to air blower by the 4th conveyance conduit, is conveyed by air blower
To the forced air drying area.
The temperature range of the hot waste gas that one area of the cooling produces is described to cool down the heat that 2nd area produce at 1000~1100 DEG C
, at 700~900 DEG C, the temperature range of the hot waste gas that 3rd area of the cooling produce is at 200~350 DEG C for the temperature range of waste gas.
Methods described also includes that setting first converts hot air duct；
The hot waste gas that four sections of the roasting and the soaking zone produce first is collected to the 5th conveyance conduit, then by described
3rd blower fan and the 3rd conveyance conduit are delivered to the preheating zone；
Described first one end for converting hot air duct connects with the 5th conveyance conduit, the other end and the 4th delivery pipe
Road is connected；
First converts hot air duct is provided with valve.
Methods described is additionally included in be set on the 4th conveyance conduit first converts cold blast sliding valve, converts cold blast sliding valve and opens when first
When, to cold air is blended into the 4th conveyance conduit, the hot waste gas to being conveyed in the 4th conveyance conduit is cooled down.
Methods described also includes that setting second converts hot air duct；
Second one end for converting hot air duct connects with second conveyance conduit, the other end and the forced air drying area and stove
The 6th conveyance conduit connection between cover blower fan.
Methods described is additionally included in setting second on the transmission pipeline before the import of the main exhauster and converts cold blast sliding valve, when
Second convert cold blast sliding valve open when, to cold air is blended into the transmission pipeline before the import of the main exhauster, to the main exhausting
Hot waste gas is cooled down in transmission pipeline before the import of machine.
Methods described is additionally included in be set on second conveyance conduit the 3rd converts cold blast sliding valve, converts cold blast sliding valve when the described 3rd
During opening, to cold air is blended into second conveyance conduit, the hot waste gas in second conveyance conduit is cooled down.
In embodiments of the present invention, the profiling temperatures according to belt type roasting machine in the course of the work, belt is calcined
Machine is divided into eight regions, and the hot waste gas produced according to each region the normal work of profiling temperatures and each region
The flow and temperature level of required hot waste gas, two sections are divided into by preheating zone when making, and roast area is divided into four sections, and will be pre-
The hot waste gas of one section of generation of two sections of heat and roasting is conveyed to one area of cooling, and the hot waste gas for being calcined two sections of generations is delivered into exhausting does
Dry area, the heat that heat exchanger is exchanged heat and will be calcined four sections and soaking zone generation is pooled to by the hot waste gas for being calcined three sections of generations
Waste gas is delivered to preheating zone, and the most of hot waste gas relative to the existing whole hot waste gas for producing preheating zone and roast area is complete
For portion's discharge air, greatly reduce preheating zone and roast area and be directly discharged into the hot waste gas amount of air, meanwhile, relative to existing
The Fans of use one provides hot waste gas for exhausting dry section and preheating zone simultaneously for, the present invention according to exhausting dry section with advance
The temperature of the hot waste gas needed for hot-zone, is individually for exhausting dry section and preheating zone provides hot waste gas, has more reasonably used heat
The energy；Roasting three sections generation hot waste gas burning gases and air can be preheated by heat exchanger, make burning gases and
Air is burnt by being transmitted further to preheating zone and roast area after preheating, effectively using three sections of hot waste gas of generation of roasting
The consumption of burning gases can also be saved while heat, the energy has been saved；Simultaneously as using two sections of preheating and roasting one
The hot waste gas that section is produced is cooled down to the pelletizing for cooling down an area, it is to avoid the pellet strength for cooling down an area is produced due to extremely cold
The phenomenon of raw destruction, while the temperature for cooling down the hot waste gas that an area produces is also higher so that the temperature of the hot waste gas in one area of cooling
Temperature with the pelletizing of soaking zone is closer to, and for prior art, the hot waste gas in the area of cooling one in the present invention can
It is incubated with the pelletizing preferably to soaking zone, improves the intensity of pelletizing.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of warm-air supply schematic diagram of energy-efficient belt type roasting machine provided in an embodiment of the present invention.
Wherein,
1 forced air drying area；2 exhausting dry sections；
3 preheating zones, 31 preheated one-sections, 32 two sections of preheatings；
4 roast areas, 41 one section of roastings, 42 two sections of roastings, 43 three sections of roastings, 44 four sections of roastings；
5 soaking zones；6 one area of cooling；7 2nd area of cooling；8 3rd area of cooling；
9 first blower fans；10 first conveyance conduits；11 second blower fans；12 second conveyance conduits；13 heat exchangers；14 main exhausting
Machine；15 the 3rd blower fans；16 the 3rd conveyance conduits；17 cooling blowers；18 the 5th conveyance conduits；The belt type roasting machine in 19 one area of cooling
Upper cover；The belt type roasting machine upper cover in 20 2nd area of cooling；21 the 4th conveyance conduits；22 air blowers；23 first convert hot air duct；24
One converts cold blast sliding valve；25 the 6th conveyance conduits；26 bonnet blower fans；27 second convert hot air duct；28 second convert cold blast sliding valve；29 the 3rd convert
Cold blast sliding valve；
The combustion gas pipes of A first；The combustion gas pipes of B second；C air ducts.
Specific embodiment
In order to solve whole hot waste gas and roast area leading portion, the big portion in stage casing that preheating zone present in prior art produces
Point hot waste gas is directly discharged into the energy waste that air causes and environmental pollution and blower fan is converged from roast area back segment and soaking zone
The problem of the energy waste that exhausting dry section and preheating zone are caused, this hair are conveyed to after the hot waste gas cooling for collecting 700 DEG C got up
Bright embodiment provides a kind of warm-air supply method of energy-efficient belt type roasting machine, and the method includes：
As shown in figure 1, belt type roasting machine is divided into eight regions, according to stream traffic direction be followed successively by forced air drying area 1,
Exhausting dry section 2, preheating zone 3, roast area 4, soaking zone 5, one area 6 of cooling, three areas 8 of two areas 7 of cooling and cooling；
Preheating zone 3 is divided into two section 32 of preheated one-section 31 and preheating, the temperature that two section 32 of preheating is higher than preheated one-section
31 temperature, is divided into roast area 4 one section 41 of roasting, two section 42 of roasting, three section 43 of roasting and is calcined four section 44, roasting one
Section 41, the temperature for being calcined two section 42, being calcined three section 43 and be calcined four section 44 gradually rise；
The hot waste gas that two section 32 and one section of 41 generation of roasting will be preheated collects and by the first blower fan 9 and the first conveying
Pipeline 10 is delivered to one area 6 of cooling；
Two section of 42 hot waste gas of generation will be calcined exhausting drying will be delivered to by the second blower fan 11 and the second conveyance conduit 12
Area 2；
The hot waste gas for being calcined three section of 43 generation is pooled to heat exchanger 13, by being delivered to main exhausting after the heat exchange of heat exchanger 13
Machine 14；
The hot waste gas that four section 44 and soaking zone 5 produce will be calcined to collect and by the 3rd blower fan 15 and the 3rd delivery pipe
Road 16 is delivered to preheating zone 3, wherein, the hot waste gas that four section 44 of roasting and soaking zone 5 produce is conveyed to the whole region of preheating zone 3
Utilized, i.e., be conveyed to preheated one-section 31 simultaneously and preheating is utilized for two section 32；
Two section of 32 temperature range of the hot waste gas of generation is preheated at 300~400 DEG C, one section of 41 hot waste gas of generation of roasting
Temperature range is calcined two section of 42 temperature range of the hot waste gas of generation at 450~500 DEG C at 400~450 DEG C, is calcined three section 43
The temperature range of the hot waste gas of generation is calcined the temperature range of the hot waste gas that four section 44 and soaking zone 5 produce at 500~600 DEG C
At 600~700 DEG C.
During work, there is certain length in each region to belt type roasting machine, in the diverse location in each region
Place, the temperature of produced hot waste gas is also different in course of reaction, therefore, in embodiments of the present invention, according to each area
Hot waste gas required when the profiling temperatures and each region normal work of the hot waste gas that various location is produced in domain
Flow and temperature level, are reasonably divided into corresponding hop count, then different sections of hot waste gas is carried out into rational profit by the region
With.
In the embodiment of the present invention, in the length range of preheating zone 3, the temperature of a certain section of hot waste gas of generation is in 300
Between~400 DEG C, in the length range of roast area 4, according to stream traffic direction, the temperature of roast area 4 gradually rises,
In the leading portion of roast area 4, the temperature of the hot waste gas of generation is between 400~450 DEG C, and temperature is between 300~450 DEG C
Hot waste gas can be used to cool down the pelletizing for cooling down an area 6, therefore can be two sections by 3 points of preheating zone, by preheating zone 3
The temperature of the hot waste gas of generation is in part between 300~400 DEG C as two section 32 of preheating, the heat that will be produced in roast area 4
The temperature of waste gas is in part between 400~450 DEG C as one section 41 of roasting, has corresponding bellows to the section at each section
The hot waste gas of generation is collected, therefore can preheat two section 32 of the bellows hot waste gas collected and the bellows for being calcined a section 41
The hot waste gas of collection collects, and is delivered to one area 6 of cooling by the first blower fan 9 and the first conveyance conduit 10, i.e., with 300~
450 DEG C of hot waste gas is cooled down to the pelletizing for cooling down an area 6, and the pelletizing temperature for cooling down an area 6 is general more than 1300 DEG C, existing
In having a technology, belt type roasting machine has two cooling zones, and one area of cooling and 2nd area of cooling use a cooling blower, cold by this
But blower fan is cooled down using 25 DEG C of air to more than 1000 DEG C of pelletizing, due to excessive temperature differentials, it may appear that due to extremely cold
And make the phenomenon that the intensity of pelletizing substantially reduces, and in the present invention, belt type roasting machine has three cooling zones, one area 6 of cooling uses
300~450 DEG C of hot waste gas is cooled down to pelletizing, reduces the temperature difference, it is to avoid pelletizing produces intensity decreases due to extremely cold
Phenomenon, increased the intensity of pelletizing, and pelletizing is after one area 6 of cooling carries out tentatively cooling, then transports to the areas 7 of cooling two and cooling three
Area 8, the area 7 of cooling two and the area 8 of cooling three share a cooling blower 17；Meanwhile, two section 32 and one section 41 of heat of roasting will be preheated
Waste gas is recycled, rather than is directly discharged into air, has saved the energy, reduces the pollution to environment；
In roast area 4, because temperature gradually rises, with the range of one section of 41 certain length being connected of roasting, produce
The temperature of raw hot waste gas carries out temperature required when exhausting is cooled down between 450~500 DEG C to the pelletizing of exhausting dry section 2
Degree is general at 350 DEG C or so, therefore can carry out exhausting drying to pelletizing using the hot waste gas for being in the temperature range, can be by
The temperature of the hot waste gas produced in roast area 4 is in part between 450~500 DEG C as two section 42 of roasting, by the wind of this section
The hot waste gas that machine is collected is conveyed to exhausting dry section 2 by the second blower fan 11 and the second conveyance conduit 12, is to adopt in the prior art
Exhausting dry section 1 is delivered to 700 DEG C of hot waste gas, but by the temperature of the hot waste gas will be significantly larger than the institute of exhausting dry section 1
The temperature of the hot waste gas for needing, therefore also need the hot waste gas for 700 DEG C to be blended into a large amount of cold wind, and the embodiment of the present invention can use roasting
The hot waste gas for burning two section 42 carries out exhausting drying to the pelletizing of exhausting dry section 2, and during transmission, temperature has hot waste gas
Declined, if the temperature needed for the temperature of hot waste gas is still higher than exhausting dry section 2, be blended into a small amount of cold wind, phase
Conventionally, the hot waste gas reasonably to two section of 42 generation of roasting is utilized, rather than is directly discharged into air, is saved
About the energy reduces the pollution to environment simultaneously；
In roast area 4, with the range of two section of 42 residue length being connected of roasting, the temperature of the hot waste gas of generation is 500
Between~700 DEG C, and the hot waste gas in wherein 600~700 DEG C temperature ranges can be used to carry out the pelletizing in preheating zone 3 it is pre-
Heat, therefore the part that the temperature of the hot waste gas produced in roast area 4 is between 500~700 DEG C can be further subdivided into two sections,
Wherein, the temperature range of the hot waste gas of generation is in part between 500~600 DEG C as three section 43 of roasting, and the heat of generation is given up
The temperature range of gas is in part between 600~700 DEG C as four section 44 of roasting, uses four section of 44 hot waste gas of generation of roasting
Concurrent heating is carried out come the pelletizing to preheating zone 3, in the prior art, is produced the back segment of roast area 4 and soaking zone 5 by a Fans
Hot waste gas is conveyed to exhausting dry section 2 and preheating zone 3, therefore is conveyed to the temperature of the hot waste gas of exhausting dry section 2 and preheating zone 3
The temperature for being hot waste gas needed for identical, but exhausting dry section 2 and preheating zone 3 is different, the heat needed for exhausting dry section 2
The temperature of waste gas is 350 DEG C, to be produced less than the temperature of the hot waste gas needed for preheating zone 3, the back segment of roast area 4 and soaking zone 5
The temperature of hot waste gas at 700 DEG C or so, therefore in order to meet the demand of exhausting dry section 2, it is necessary to the 700 DEG C of left sides collected to blower fan
Right hot waste gas is blended into and exhausting dry section 2 and preheating zone 3 is conveyed to after a large amount of cold wind reach 350 DEG C or so, wastes heat
Amount, meanwhile, when the hot waste gas using 350 DEG C or so carries out concurrent heating to the pelletizing of preheating zone 3, the temperature of hot waste gas still compared with
It is low so that hot waste gas supplements still less to the heat of preheating zone 3, therefore the heat for using fuel combustion to produce also is needed to preheating
The pelletizing in area 3 carries out concurrent heating, and in the embodiment of the present invention, improves the temperature of the hot waste gas for being conveyed to preheating zone 3, therefore increases
The heat to preheating zone 3 is supplemented, the consumption of fuel can be reduced；And be calcined three section 43 hot waste gas temperature it is also higher,
If being directly discharged into air can cause the waste of the energy, therefore the hot waste gas for being calcined three section of 43 generation can be pooled into heat exchanger
13, exchanged heat in heat exchanger 13, the heatrejection after heat exchange can be reduced, and main exhauster 14 is now delivered to again and is entered greatly
Gas, for prior art, in roast area 4, the hot waste gas for entering air is only to be calcined three section of 43 heat of generation to give up
Gas, with only the hot waste gas that the back segment of roast area 4 is produced in the prior art, and remaining whole enters air, therefore reduces
The outer discharge capacity of hot waste gas, and then reduce the treating capacity of the desulphurization system of hot waste gas, saves a construction investment, saved into
This, while reducing the pollution to environment, and is carried out before the hot waste gas for being calcined three section of 43 generation is entered into air to it
Heat exchange, takes full advantage of the heat energy of hot waste gas；
In embodiments of the present invention, the temperature range of the hot waste gas that soaking zone 5 produces is also between 600~700 DEG C,
Can be used to preheat the pelletizing of preheating zone 3, as shown in figure 1, the heat that four section 44 of bellows are collected therefore can will be calcined
The hot waste gas that the bellows of waste gas and soaking zone 5 are collected is collected to the 5th conveyance conduit 18, and defeated by the 3rd blower fan 15 and the 3rd
Pipeline 16 is sent to be delivered to preheating zone 3.
In the course of work of belt type roasting machine, in the whole length scope and the whole length model of roast area 4 of preheating zone 3
Burner is all distributed with enclosing, burning gases are distributed into preheating zone 3 and roast area 4 by burner is burnt, burning gases one
As be the mixed gas of combustion gas and combustion air, be now the mode of flameless combustion, wherein, combustion gas can be coke-stove gas, help
Combustion gas body is air, and in embodiments of the present invention, the burning gases that can distribute to preheating zone 3 and roast area 4 are defeated in advance
Deliver in heat exchanger 13, because three section 43 of hot waste gas of roasting is also pooled in heat exchanger 13, therefore, the heat that three section 43 of roasting is given up
Gas can be preheated with the burning gases in heat exchanging device 13, then the burning gases after preheating are delivered into the He of preheating zone 3 respectively
Roast area 4, in the course of work of belt type roasting machine, to reach roasting requirement, it is necessary to maintain certain ignition temperature, if
The combustion gas higher calorific value of burning gases is relatively low, then cannot meet roasting and require, it is therefore desirable to be higher using combustion gas higher calorific value
Burning gases, and the cost of combustion gas higher calorific value burning gases higher is also higher, but in embodiments of the present invention, by combustion
Burn gas to be preheated, mainly the combustion air in burning gases is preheated, improve the temperature of combustion air, because
The effect for improving the temperature of combustion air is better than the effect of the temperature for improving combustion gas, can so improve the theory of burning gases
Ignition temperature, makes the relatively low burning gases of combustion gas higher calorific value also to meet roasting and requires, reduces purchase gas cost, meanwhile,
When reaching identical ignition temperature, preheated by burning gases, the volume of used burning gases can be reduced, dropped
The low consumption of burning gases, has saved the energy；
In embodiments of the present invention, the oxygen of ferrous oxide is completed in order to ensure to have enough oxygen in belt type roasting machine
Change, it is also possible to air is conveyed in heat exchanger 13, preheated the air in the hot waste gas heat exchanging device 13 of three section 43 of roasting,
When the oxygen content for detecting belt type roasting machine is relatively low, the air after preheating is delivered to preheating zone 3 and roast area 4.
In embodiments of the present invention, as shown in figure 1, three output channels, respectively first can be set for heat exchanger 13
Combustion gas pipe A, the second combustion gas pipe B and air duct C；
First combustion gas pipe A is connected with preheating zone 3, for the burning gases after preheating to be delivered into preheating zone 3；
Second combustion gas pipe B is connected with roast area 4, for the burning gases after preheating to be delivered into roast area 4；
Air duct C is connected with preheating zone 3 and roast area 4 respectively, for the air after preheating to be delivered into preheating respectively
Area 3 and roast area 4.
As shown in figure 1, in embodiments of the present invention, hot waste gas that an area 6 produces can also be cooled down by cooling down an area 6
Belt type roasting machine upper cover 19 be delivered to soaking zone 5；
The hot waste gas that two areas 7 of cooling are produced is delivered to the He of preheating zone 3 by cooling down the belt type roasting machine upper cover 20 in two areas 7
Roast area 4, wherein, the whole region that the hot waste gas that cooling 2nd area 7 produces is conveyed to preheating zone 3 is utilized, i.e., convey simultaneously
Utilized for two section 32 to preheated one-section 31 and preheating, the hot waste gas that cooling 2nd area 7 produces also is conveyed to the whole area of roast area 4
Domain is utilized, i.e., be conveyed to one area 41 of roasting, two areas 42 of roasting, three areas 43 of roasting and four areas 44 of roasting simultaneously and utilized；
The hot waste gas that produces of three areas 8 will be cooled down air blower 22 will be delivered to by the 4th conveyance conduit 21, by air blower 22
It is delivered to forced air drying area 1.
In the belt type roasting machine course of work, the temperature of transport to the pelletizing in one area 6 of cooling is general at 1300 DEG C or so,
It is the hot waste gas using one section of 41 temperature range of generation of two section 32 of preheating and roasting at 300~450 DEG C in the embodiment of the present invention
To cool down an area 6 pelletizing cool down, and be in the prior art using 25 DEG C air to cool down an area pelletizing carry out it is cold
But, the temperature of the hot waste gas that one area of cooling 6 therefore in the embodiment of the present invention produces is higher than and cool down in the prior art an area 6 and produce
Raw temperature, the temperature range of the hot waste gas that one area of cooling 6 in the embodiment of the present invention produces is existing at 1000~1100 DEG C or so
There is the temperature in the area 6 of cooling one in technology at 800 DEG C or so, in the prior art, 800 DEG C or so that an area produces of heat will be cooled down
Waste gas is delivered to soaking zone 5 and the pelletizing in soaking zone 5 is incubated, but pelletizing temperature in soaking zone 5 is above 800 DEG C
, therefore, pelletizing that in the prior art can not be well to soaking zone 5 is incubated so that the intensity of the pelletizing of soaking zone 5 compared with
It is low, especially positioned at the pelletizing of the bottom of soaking zone 5, but in embodiments of the present invention, due to cooling down the hot waste gas that an area 6 produces
Temperature is higher, and the temperature with the pelletizing of soaking zone 5 is closer to, therefore can be very good to produce insulation to the pelletizing of soaking zone 5
Effect, makes the pelletizing of soaking zone 5 effective intensity for carrying out lattice growth, improving pelletizing in insulating process；
In embodiments of the present invention, pelletizing continues forwards transportation, mistake of the pelletizing in transport after the cooling in the area 6 of supercooling one
Cheng Zhong, temperature can also decline, and according to Temperature Distribution feature, can go out cool down three areas 8 of two areas 7 and cooling, cooling with subdivided
The temperature of the hot waste gas that 2nd area 7 produces cools down the hot waste gas that 2nd area 7 produces higher than the temperature of the hot waste gas that cooling 3rd area 8 produces
Temperature range it is general at 700~900 DEG C, can will cool down the heat in two areas 7 by cooling down the belt type roasting machine upper cover 19 in two areas 7
Waste gas is delivered to preheating zone 3 and roast area 4, simultaneously as the length of soaking zone 5 is shorter, the hot waste gas needed for soaking zone 5 also compared with
It is few, therefore the unnecessary hot waste gas of one section of generation of cooling can enter into the belt type roasting machine upper cover 19 for cooling down two areas 7, by cold
But the belt type roasting machine upper cover 19 in two areas 7 is delivered to preheating zone 3 and roast area 4, is the course of reaction of preheating zone 3 and roast area 4
Heat is provided；
The temperature range for cooling down the hot waste gas of the generation of 3rd area 8 is general at 200~350 DEG C, is in the heat in the temperature range
Waste gas can be used to carry out the pelletizing in forced air drying area 1 forced air drying, therefore, the hot waste gas that cooling 3rd area 8 produces can lead to
Cross the 4th conveyance conduit 21 and be delivered to forced air drying area 1.
In embodiments of the present invention, the Temperature Distribution focus of the hot waste gas that the cooling segment according to belt type roasting machine is produced,
It is three regions by the cooling segment of belt type roasting machine, that is, cools down an area 6, three areas 8 of two areas 7 of cooling and cooling, wherein, cooling one
The cooling gas that area 6 is used are to preheat two section 32 and one section of 41 hot waste gas of generation of roasting, and produced using cooling one area 6
Hot waste gas is used for being incubated soaking zone 5, while the hot waste gas for cooling down the generation of 2nd area 7 can be used to preheating zone 3 and roasting
The reaction in area 4 provides heat, and the hot waste gas for cooling down the generation in three areas 8 can be dried to the pelletizing in forced air drying area 1, relatively
For cooling segment to be only divided into two area Liang Ge regions of one area of cooling and cooling in the prior art, on the one hand, reasonably make
With two section 32 of preheating and the hot waste gas of one section 41 of roasting, the outer discharge capacity of the hot waste gas of whole belt type roasting machine is reduced, save
The energy reduces pollution simultaneously；On the other hand, because the temperature range of two section 32 of preheating and the hot waste gas for being calcined a section 41 is
300~450 DEG C, therefore, carrying out cooling to the pelletizing for cooling down an area 6 using the hot waste gas can prevent due to extremely cold to pelletizing
Internal structure produces the phenomenon of destruction, increased the intensity of pelletizing；Another aspect, the temperature of the hot waste gas that cooling one area 6 produces
Higher, pelletizing that can be preferably to soaking zone 5 is incubated, more rational by the way that cooling segment is divided into three regions
The hot waste gas of different temperatures is used.
When the winter of cold is in, extraneous temperature is relatively low, therefore, the hot waste gas produced in cooling 3rd area 8 is by the
During four conveyance conduits 21 are conveyed to air blower 22, may be relatively low due to ambient temperature, and make the 4th conveyance conduit 21
There is the phenomenon of temperature reduction in transmitting procedure in interior hot waste gas, and then causes that the hot waste gas in the 4th conveyance conduit 21 is discontented with
The phenomenon of the demand of sufficient forced air drying, therefore, it can to set first and converts hot air duct 23, first convert one end of hot air duct 23 with
5th conveyance conduit 18 is connected, and the other end is connected with the 4th conveyance conduit 21, and is converted first and set valve on hot air duct 23
Door, because the temperature range of four section 44 of roasting and the hot waste gas of the generation of soaking zone 5 is at 600~700 DEG C, is higher than the 4th delivery pipe
The temperature of the hot waste gas in road 21, therefore, if the temperature for detecting the hot waste gas in the 4th conveyance conduit 21 is relatively low to be unsatisfactory for drum
When air-drying dry demand, valve can be opened, now the high temperature hot waste gas in the 5th conveyance conduit 18 can convert hot blast by first
Pipeline 23 enters the 4th conveyance conduit 21 so that the temperature of the hot waste gas in the 4th conveyance conduit 21 is raised, and treats the 4th delivery pipe
When the temperature of the hot waste gas in road 21 meets forced air drying demand, first can be converted the valve closing on hot air duct 23.
In embodiments of the present invention, it is also possible to set first on the 4th conveyance conduit 21 and convert cold blast sliding valve 24, if actual roasting
During burning, if the temperature of the temperature higher than the hot waste gas needed for blasting drying period of the hot waste gas that cooling 3rd area 8 produces, can be with
Open first and convert cold blast sliding valve 24, to cold air is blended into the 4th conveyance conduit 21, the hot waste gas in the 4th conveyance conduit 21 is carried out
Cool until meeting forced air drying requirement.
As shown in figure 1, the hot waste gas that the 4th conveyance conduit 21 is transmitted is delivered to forced air drying area 1 by air blower 22,
Forced air drying is carried out to the pelletizing in forced air drying area 1, the hot waste gas after forced air drying is conveyed to by the 6th conveyance conduit 25
Bonnet blower fan 26, when the temperature of the hot waste gas after forced air drying is less than 100 DEG C, the water content of hot waste gas is higher, heat now
Waste gas easily corrodes the 6th conveyance conduit 25 and bonnet blower fan 26, so, second can be set and convert hot air duct 27, second converts
One end of hot air duct 27 is connected with the second conveyance conduit 12, and the other end is connected with the 6th conveyance conduit 25, due to two sections of roasting
42 produce hot waste gas temperature range at 450~500 DEG C, the temperature of the hot waste gas being higher than in the 6th conveyance conduit 25, because
This, the high temperature hot waste gas in the second conveyance conduit 12 can convert hot air duct 27 and enter the 6th conveyance conduit 25 by second so that
The temperature of the hot waste gas in the 6th conveyance conduit 25 be higher than dew-point temperature, reduce the 6th conveyance conduit 25 in hot waste gas it is aqueous
Amount, greatly reduces the corrosion rate of the 6th conveyance conduit 25 and bonnet blower fan 26.
As shown in figure 1, in embodiments of the present invention, the hot waste gas that three section 43 of roasting after the heat exchange of heat exchanger 13 by passing through master
Air exhauster 14 enters air, and the hot waste gas that exhausting dry section 2 and preheated one-section 31 are produced can also be collected to heat exchanger 13 with master
Transmission pipeline between air exhauster 14, and then air is emitted into by main exhauster 14, in order to prevent heatrejection higher right
The internal structure of main exhauster 14 has a negative impact, and can be set on the transmission pipeline before the import of main exhauster 14
Two convert cold blast sliding valve 28, can open second and convert cold blast sliding valve 28, cold to being blended into the transmission pipeline before the import of main exhauster 14
Gas, the hot waste gas to being transmitted in the transmission pipeline before the import of main exhauster 14 is transmitted further to main exhausting after cooling down
Machine 14, in the prior art, has a negative impact to prevent heatrejection higher to the internal structure of main exhauster, can adopt
It is with the main shaft blower fan that the quality of materials of internal structure is more excellent therefore relatively costly, and use the method in the present invention can be with
Reduce the requirement to the material quality of the internal structure of main exhauster 14, reduces cost.
As shown in figure 1, in embodiments of the present invention, it is also possible to set the 3rd on the second conveyance conduit 12 and convert cold blast sliding valve
29, can choose whether that opening the 3rd converts cold blast sliding valve 29 according to actual conditions, if two section of 42 temperature of the hot waste gas of generation of roasting
During higher than temperature needed for exhausting dry section 1, the 3rd can be opened and convert cold blast sliding valve 29, it is cold to being blended into the second conveyance conduit 12
Gas, cools down to the hot waste gas in the second conveyance conduit 12 until meeting exhausting drying condition.
In embodiments of the present invention, the profiling temperatures according to belt type roasting machine in the course of the work, belt is calcined
Machine is divided into eight regions, and the hot waste gas produced according to each region the normal work of profiling temperatures and each region
The flow and temperature level of required hot waste gas, two sections are divided into by preheating zone 3 when making, and roast area 4 is divided into four sections, and will
The hot waste gas of one section of 41 generation of two section 32 of preheating and roasting is conveyed to one area 6 of cooling, and the hot waste gas for being calcined two section of 42 generation is defeated
Exhausting dry section 2 is delivered to, the hot waste gas for being calcined three section of 43 generation is pooled into heat exchanger 13 is exchanged heat and will be calcined four sections
44 and the hot waste gas that produces of soaking zone 5 be delivered to preheating zone 3, relative to the existing whole hot waste gas for producing preheating zone 3 and
Most of hot waste gas of roast area 4 all for discharge air, greatly reduces preheating zone 3 and roast area 4 and is directly discharged into air
Hot waste gas amount, meanwhile, relative to it is existing using a Fans simultaneously for exhausting dry section 2 and preheating zone 3 provide hot waste gas
For, the temperature of hot waste gas of the present invention according to needed for exhausting dry section 2 and preheating zone 3 is individually for exhausting dry section 2 and preheating
Area 3 provides hot waste gas, has more reasonably used heat energy；Three section of 43 hot waste gas of generation of roasting can be by 13 pairs, heat exchanger
Burning gases and air are preheated, and burning gases and air is carried out by being transmitted further to preheating zone 3 and roast area 4 after preheating
Burning, can also save the consumption of burning gases while effectively using the heat of three section of 43 hot waste gas of generation of roasting,
The energy is saved；Simultaneously as being entered to the pelletizing for cooling down an area 6 using one section of 41 hot waste gas of generation of two section 32 of preheating and roasting
Row cooling, it is to avoid produce the phenomenon of destruction due to extremely cold to the pellet strength for cooling down an area 6, while cool down an area 6 producing
Hot waste gas temperature it is also higher so that the temperature of hot waste gas in one area 6 of cooling more connects with the temperature of the pelletizing of soaking zone 5
Closely, for prior art, the present invention in the area 6 of cooling one hot waste gas can be preferably to soaking zone 5 pelletizing enter
Row insulation, improves the intensity of pelletizing.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of warm-air supply method of energy-efficient belt type roasting machine, it is characterised in that methods described includes：
Belt type roasting machine is divided into eight regions, forced air drying area, exhausting dry section, preheating are followed successively by according to stream traffic direction
Area, roast area, soaking zone, one area of cooling, 3rd area of 2nd area of cooling and cooling；
Preheating zone is divided into two sections of preheated one-section and preheating, the temperature of the temperature higher than preheated one-section of two sections of preheating will be roasted
Burn area be divided into roasting one section, roasting two sections, roasting three sections and roasting four sections, roasting one section, roasting two sections, roasting three sections and
The temperature of four sections of roasting gradually rises；
The hot waste gas that two sections and one section of generation of roasting will be preheated is collected and is conveyed by the first blower fan and the first conveyance conduit
To one area of cooling；
The hot waste gas for being calcined two sections of generations is delivered to exhausting dry section by the second blower fan and the second conveyance conduit；
The hot waste gas for being calcined three sections of generations is pooled to heat exchanger, by being delivered to main exhauster after heat exchanger heat exchange；
The hot waste gas that four sections and soaking zone generation will be calcined is collected and is delivered to by the 3rd blower fan and the 3rd conveyance conduit
Preheating zone；
Wherein, two sections of temperature ranges of the hot waste gas of generation are preheated at 300~400 DEG C, one section of temperature of the hot waste gas of generation is calcined
Degree scope is calcined two sections of temperature ranges of the hot waste gas of generation at 450~500 DEG C at 400~450 DEG C, three sections of generations of roasting
, at 500~600 DEG C, the temperature range of the hot waste gas that four sections of roasting and soaking zone produce is 600~700 for the temperature range of hot waste gas
℃。
2. the warm-air supply method of energy-efficient belt type roasting machine according to claim 1, it is characterised in that to described
Conveying burning gases in heat exchanger, the burning gases are the mixed gas of combustion gas and combustion air, to defeated in the heat exchanger
Air is sent, the burning gases and air in the hot waste gas heat exchanging device of three sections of the roasting being delivered in heat exchanger are defeated after being preheated
Deliver to the main exhauster；
Burning gases after preheating are delivered to the preheating zone and the roast area respectively, when detecting the belt type roasting machine
When oxygen content is relatively low, the air after preheating is delivered to the preheating zone and the roast area respectively.
3. the warm-air supply method of energy-efficient belt type roasting machine according to claim 2, it is characterised in that described to change
Hot device includes three output channels, respectively the first combustion gas pipe, the second combustion gas pipe and air duct；
First combustion gas pipe is connected with the preheating zone, for the burning gases after preheating to be delivered into the preheating zone；
Second combustion gas pipe is connected with the roast area, for the burning gases after preheating to be delivered into the roast area；
Air duct is connected with the preheating zone and the roast area respectively, described for the air after preheating to be delivered to respectively
Preheating zone and the roast area.
4. the warm-air supply method of energy-efficient belt type roasting machine according to claim 1, it is characterised in that the side
Method also includes：
The hot waste gas that one area of the cooling is produced is delivered to the soaking zone by cooling down the belt type roasting machine upper cover in an area；
By it is described cooling 2nd area produce hot waste gas by cool down 2nd area belt type roasting machine upper cover be delivered to the preheating zone with
The roast area；
The hot waste gas that 3rd area of the cooling produce is delivered to air blower by the 4th conveyance conduit, institute is delivered to by air blower
State forced air drying area.
5. the warm-air supply method of energy-efficient belt type roasting machine according to claim 4, it is characterised in that described cold
But an area produce hot waste gas temperature range at 1000~1100 DEG C, it is described cooling 2nd area produce hot waste gas temperature range
At 700~900 DEG C, the temperature range of the hot waste gas that 3rd area of the cooling produce is at 200~350 DEG C.
6. the warm-air supply method of energy-efficient belt type roasting machine according to claim 4, it is characterised in that the side
Method also includes that setting first converts hot air duct；
The hot waste gas that four sections of the roasting and the soaking zone produce first is collected to the 5th conveyance conduit, then by the described 3rd
Blower fan and the 3rd conveyance conduit are delivered to the preheating zone；
Described first one end for converting hot air duct connects with the 5th conveyance conduit, and the other end connects with the 4th conveyance conduit
It is logical；
First converts hot air duct is provided with valve.
7. the warm-air supply method of energy-efficient belt type roasting machine according to claim 4, it is characterised in that the side
Method is additionally included in setting first on the 4th conveyance conduit and converts cold blast sliding valve, when first converts cold blast sliding valve opens, to the described 4th
Cold air is blended into conveyance conduit, the hot waste gas to being conveyed in the 4th conveyance conduit is cooled down.
8. the warm-air supply method of the energy-efficient belt type roasting machine according to claim 1 to 7 any one claim,
Characterized in that, methods described also includes that setting second converts hot air duct；
Second one end for converting hot air duct connects with second conveyance conduit, the other end and the forced air drying area and bonnet wind
The 6th conveyance conduit connection between machine.
9. the warm-air supply method of the energy-efficient belt type roasting machine according to claim 1 to 7 any one claim,
Characterized in that, methods described is additionally included in setting second on the transmission pipeline before the import of the main exhauster converts cold wind
Valve, when second converts cold blast sliding valve opens, to cold air is blended into the transmission pipeline before the import of the main exhauster, to the master
The hot waste gas in transmission pipeline before the import of air exhauster is cooled down.
10. the warm-air supply side of the energy-efficient belt type roasting machine according to claim 1 to 7 any one claim
Method, it is characterised in that methods described is additionally included in be set on second conveyance conduit the 3rd converts cold blast sliding valve, converts when the described 3rd
When cold blast sliding valve is opened, to cold air is blended into second conveyance conduit, the hot waste gas in second conveyance conduit is carried out cold
But lower the temperature.
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| CN110484713A (en) * | 2019-09-05 | 2019-11-22 | 首钢集团有限公司 | A kind of method and device producing pellet |
| CN110671931A (en) * | 2019-11-01 | 2020-01-10 | 中冶北方（大连）工程技术有限公司 | System and method for recycling hot waste gas of rotary hearth furnace |
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| CN106702143B (en) | 2018-08-28 |
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