CN104913652B - A kind of method of Shaft Furnace Pelletizing Process grog waste heat recovery and device thereof - Google Patents
A kind of method of Shaft Furnace Pelletizing Process grog waste heat recovery and device thereof Download PDFInfo
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- CN104913652B CN104913652B CN201510260232.5A CN201510260232A CN104913652B CN 104913652 B CN104913652 B CN 104913652B CN 201510260232 A CN201510260232 A CN 201510260232A CN 104913652 B CN104913652 B CN 104913652B
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Abstract
The invention discloses method and the device thereof of a kind of Shaft Furnace Pelletizing Process grog waste heat recovery, pelletizing grog from shaft furnace temperature out more than 550 DEG C, then being transported in grog storehouse by grog by chain mat machine and belt-cooling machine, during this, pelletizing the most externally dispels the heat.This part grog waste heat can be by sealing chain mat machine, belt-cooling machine, make pelletizing grog waste heat that belt-cooling machine cooling air to be heated, then hot-air is carried out after dust removal process through pipeline shunt by cleaner unit, a part is used as shaft furnace and dry rotary kiln combustion air, thus improve and make shaft furnace and the temperature of dry rotary kiln combustion air, gas saving, a part is used for carrying out predrying to wet bulb group on shaft furnace blanking belt, to reduce gas consumption amount.Remainder air cools down air as shaft furnace.Energy-saving effect of the present invention is obvious, and operation maintenance workload is little, operating cost is low, high financial profit, reduces entreprise cost, reduces environmental pollution.
Description
Technical field
A kind of method that the present invention relates to waste heat recovery, particularly relates to a kind of Shaft Furnace Pelletizing Process grog
The method of waste heat recovery.
Background technology
In iron and steel enterprise, the energy consumption of sintering work is only second to ironmaking.Sinter cooler waste gas band
The heat walked accounts for the 25%～30% of sintering plant total energy consumption, and the recovery to waste gas residual heat is that sintering is made
The important ring that industry is energy-conservation.
Heat recovery technology mainly has at present: 1. separate heat pipe heat recovery technology；2. overall
Formula heat pipe afterheat recovery technology.The design of waste heat recovery and the difference of mode, can bring the most not
Same benefit.General heat recovery mode has: 1. install heat exchanger；2. waste heat pot is installed
Stove.
Sintering process waste heat recovery effect is bad, and the mainly sensible heat of flue gas and hot blast fails effectively
Preserving, the reason of high fume temperature has heat exchanger heat transfer effect undesirable, sucks cold wind, flue
Leak gas, thermal insulation is bad.Enter the flue gas heat waste before retracting device and fail to keep an appointment 31～50%, carry out
Insulation is particularly significant to the preservation of waste heat.
Heat exchanger is mainly installed in the waste heat recovery of current domestic shaft furnace, and its key technology is to change
Can hot device adapt to the working environment of high dust.When connecting TRT, it is possible to utilize perpendicular
Stove waste heat generates electricity.
Heat exchanger is either installed waste heat boiler is still installed, to the transformation amount of integrated artistic be all
Bigger.And the recovery to heat does not account for from integrated artistic flow process, therefore waste heat
Recovering effect is unsatisfactory.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of to waste gas dedusting effect
Good, Insulation is good and engineering amount of reform is less, and cost of investment is low, the Shaft Furnace Pelletizing Process that income is big
The method of grog waste heat recovery.
Second technical problem to be solved by this invention is to provide one and realizes this Shaft Furnace Pelletizing Process
The device of the method for grog waste heat recovery.
In order to solve above-mentioned first technical problem, the Shaft Furnace Pelletizing Process grog waste heat that the present invention uses
The method reclaimed, its step includes:
(1), thermal insulation cover is installed on the chain mat machine of conveying pelletizing grog to carry out at sealing thermal insulation
Reason；
(2), use belt-cooling machine that high temperature pelletizing grog is cooled down in transportation, carry cold
Thermal insulation cover is installed on machine and carries out sealing thermal insulation process；
(3), hot blast carried out dust removal process before entering air-introduced machine；
(4), on wet bulb group belt conveyor, wet bulb group belt conveyor drying hood is arranged；
(5), the high-temperature hot-air heated by grog is transported to the combustion-supporting of shaft furnace by pipeline distribution
Wind entrance, the combustion air entrance of rotary dryer and wet bulb group belt conveyor drying hood, be used as to help
Fire air and wet bulb group is carried out predrying.
In technique scheme, in described step, all pipelines carry out isothermal holding.
In above-mentioned steps (3), use two-stage whirlwind ash separater that hot blast is carried out dedusting.
In order to solve above-mentioned second technical problem, this offer realize Shaft Furnace Pelletizing Process grog waste heat
The device of the method reclaimed, is provided with the first thermal insulation cover on chain mat machine, described chain mat machine
Outlet jointing strip cold, described belt-cooling machine is provided with the second thermal insulation cover, described belt-cooling machine
Side is provided with cooling blower, and opposite side connects cleaner unit, and described cleaner unit connects air inducing
Machine, is disposed with wet bulb group belt conveyor drying hood, described air inducing on wet bulb group belt conveyor
The outlet of machine connects the combustion air entrance of shaft furnace, the combustion air entrance of rotary dryer respectively and does
Dry airhood.
Described cleaner unit uses two-stage whirlwind ash separater.
Use method and the device thereof of the Shaft Furnace Pelletizing Process grog waste heat recovery of technique scheme, its
Operation principle is summarized as follows: from shaft furnace, temperature out is more than 550 DEG C, then for pelletizing grog
Transporting in grog storehouse by chain mat machine and belt-cooling machine by grog, during this, pelletizing is with radiation
Form is externally dispelled the heat.Using belt-cooling machine to blast a large amount of cooling wind, high temperature Shaft Furnace Pelletizing Process grog is entered
During row cooling, by convection heat transfer' heat-transfer by convection, cooling wind obtains greatly from high temperature pelletizing grog
Calorimetric amount, temperature increases substantially, and becomes high temperature air.Pipeline is used Insulation,
Reduce high temperature air heat loss to greatest extent.Then one part is used as shaft furnace and revolution is dry
The combustion air of dry machine, is equivalent to improve the initial temperature of combustion air, it is possible to reduce shaft furnace
Amount of consumed gas with rotary dryer.A part can be used to carry out predrying to wet bulb group,
Be equivalent to decrease the water content of wet bulb group, improve the initial temperature of wet bulb group, wet bulb simultaneously
Group, because of dry run thermally equivalent, both can improve pelletizing product quality, can reduce again dry wet bulb
Coal gas amount needed for Tuan, saves the energy.
The present invention is effective to waste gas dedusting, selects two-stage whirlwind ash separater to remove hot blast
Dirt, efficiency of dust collection reaches more than 90%.Account for from integrated artistic flow process, Insulation
Getting well and engineering amount of reform is less, cost of investment is low, and income is big.Use the method can be greatly
Pelletizing grog waste heat is carried out recycling.According to computational analysis, by the method to domestic certain
One 10m of pelletizing plant2Shaft furnace is transformed.The economic benefit that transformation brings includes that pellet quality carries
High, powder reclaims and three aspects of gas saving calculate.If being 2200 × 365 by annual production
× 93%=746790t, gas unit consumption is 0.5262GJ, and gas price is that 45.2 yuan/GJ calculates,
Year total economic benefit about 2,250,000 yuan.Economic benefit is the most considerable.
In sum, the present invention is a kind of effective to waste gas dedusting, and Insulation is good and engineering
Transformation amount is less, and cost of investment is low, the method for the Shaft Furnace Pelletizing Process grog waste heat recovery that income is big and
Its device.
Accompanying drawing explanation
Fig. 1 is the waste heat recovery operating diagram of the present invention.
Fig. 2 is chain mat machine waste heat recovery operating diagram.
Fig. 3 is belt-cooling machine waste heat recovery operating diagram.
Fig. 4 is that wet bulb rolls into a ball predrying operating diagram.
Fig. 5 is thermal insulation cover scheme of installation.
Detailed description of the invention
The detailed description of the invention of the present invention, describes in detail below in conjunction with the accompanying drawings.
See Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the method for Shaft Furnace Pelletizing Process grog waste heat recovery, its
Step includes:
(1), on the chain mat machine 1 of conveying pelletizing grog, the first thermal insulation cover 2 is installed to seal
Isothermal holding；
(2), use belt-cooling machine 3 that high temperature pelletizing grog is cooled down in transportation, band
Second thermal insulation cover 4 is installed in cold 3 and carries out sealing thermal insulation process；The outlet docking of belt-cooling machine 3
There is hopper 10；
(3), hot blast respectively enters shaft furnace, wet bulb group belt conveyor under the effect of air-introduced machine 7
In airhood and drying machine, hot blast used cleaner unit to carry out at dedusting before entering air-introduced machine 7
Reason；According to hot air flow and pressure and the resistant to elevated temperatures requirement of need, this method selects dual stage cyclone
Cleaner unit 6 carries out dedusting to hot blast, and efficiency of dust collection reaches more than 90%；
(4), on wet bulb group belt conveyor 9, wet bulb group belt conveyor drying hood 8 is arranged, wet
Pelletizing belt conveyor drying hood 8 ensures that the hot blast being introduced through carries out the driest adding to wet bulb group
Heat.
(5), the high-temperature hot-air heated by grog is transported to shaft furnace combustion air by pipeline distribution
Entrance, rotary dryer combustion air entrance and wet bulb group belt conveyor drying hood 8, as combustion-supporting
Air and wet bulb group is carried out predrying.
In technique scheme, in described step, all pipelines carry out isothermal holding.
Seeing Fig. 1, Fig. 2, Fig. 3 and Fig. 4, pelletizing grog temperature out from shaft furnace exceedes
550 DEG C, then grog is transported in grog storehouse, during this by chain mat machine and belt-cooling machine
Pelletizing the most externally dispels the heat.Chain mat machine 1, belt-cooling machine 3 are sealed by the present invention,
So that pelletizing grog waste heat is delivered to cool down in air to greatest extent, make more than pelletizing grog
Cooling air is heated by heat, then carries out the heat in heated cold air reclaiming profit
With.Hot-air is used for doing combustion air, thus improves the temperature of combustion air.Also it is used for wet
Pelletizing carries out predrying, and wet bulb is rolled into a ball because of dry run thermally equivalent, both can improve pelletizing product matter
Amount, can reduce again the coal gas amount needed for dry wet bulb group.
See Fig. 2, when pelletizing from shaft furnace out on chain mat machine 1 in transportation, at carrier bar
The normal position of machine 1 is installed the first thermal insulation cover 2 and is sealed.This process mainly reduces pelletizing
Heat in transportation dissipates.
See Fig. 3, when pelletizing grog transports belt-cooling machine 3, the cooling blower of belt-cooling machine 3
5 bloat cooling wind cools down pelletizing grog.Normal position at belt-cooling machine 3 installs the
Two thermal insulation covers 4 seal.After cooling wind carries out heat exchange with high temperature pelletizing grog, hot blast
It is introduced in two-stage whirlwind ash separater 6 and carries out dedusting, then defeated under the effect of air-introduced machine 7
Deliver in the combustion-supporting pipeline of shaft furnace and rotary dryer and the wet bulb group of transportation of wet pelletizing belt 9 is defeated
Send in belt drying hood 8.The outlet of belt-cooling machine 3 is to being connected to hopper 10；
See Fig. 4, roll into a ball the normal position installation wet bulb of the interlude of belt 9 at conveying wet bulb
Group's belt conveyor drying hood 8, wet bulb group belt conveyor drying hood 8 arranges multiple little air inlet,
Wet bulb group is carried out predrying thence into wet bulb group belt conveyor drying hood 8 by hot blast.At wet bulb
The lower section of group's belt conveyor drying hood 8 arranges an air outlet.
Seeing Fig. 5, the first thermal insulation cover 2 and the second thermal insulation cover 4 all use overlap joint, side up and down
Support fixed form, this connected mode difficulty of construction is little, can install in process of production,
And overhaul, easy to maintenance.
Claims (5)
1. a method for Shaft Furnace Pelletizing Process grog waste heat recovery, is provided with on chain mat machine (1)
One thermal insulation cover (2), outlet jointing strip cold (3) of described chain mat machine (1), described band is cold
Being provided with the second thermal insulation cover (4) on machine (3), described belt-cooling machine (3) side is provided with cooling blower
(5), opposite side connects cleaner unit (6), and described cleaner unit connects air-introduced machine (7),
Wet bulb group's belt conveyor drying hood (8), described air inducing it is disposed with on wet bulb group's belt conveyor (9)
The outlet of machine (7) connects the combustion air entrance of the combustion air entrance of shaft furnace, rotary dryer respectively
With dry airhood (8), it is characterized in that: its step includes:
(1), thermal insulation cover is installed on the chain mat machine of conveying pelletizing grog to carry out at sealing thermal insulation
Reason；
(2), use belt-cooling machine that high temperature pelletizing grog is cooled down in transportation, carry cold
Thermal insulation cover is installed on machine and carries out sealing thermal insulation process；
(3), hot blast carried out dust removal process before entering air-introduced machine；
(4), on wet bulb group belt conveyor, wet bulb group belt conveyor drying hood is arranged；
(5), the high-temperature hot-air heated by grog is transported to the combustion-supporting of shaft furnace by pipeline distribution
Wind entrance, the combustion air entrance of rotary dryer and wet bulb group belt conveyor drying hood, be used as to help
Fire air and wet bulb group is carried out predrying.
The method of Shaft Furnace Pelletizing Process grog waste heat recovery the most according to claim 1, it is special
Levy and be: in described step, all pipelines carry out isothermal holding.
The method of Shaft Furnace Pelletizing Process grog waste heat recovery the most according to claim 1 and 2,
It is characterized in that: in above-mentioned steps (3), use two-stage whirlwind ash separater that hot blast is carried out dedusting.
4. realize the method for Shaft Furnace Pelletizing Process grog waste heat recovery according to claim 1
Device, is characterized in that: be provided with the first thermal insulation cover (2), described carrier bar on chain mat machine (1)
Outlet jointing strip cold (3) of machine (1), described belt-cooling machine (3) is provided with the second thermal insulation cover
(4), described belt-cooling machine (3) side is provided with cooling blower (5), and opposite side connects cleaner unit
(6), described cleaner unit connects air-introduced machine (7), in the upper layout of wet bulb group's belt conveyor (9)
Having wet bulb group's belt conveyor drying hood (8), the outlet of described air-introduced machine (7) connects shaft furnace respectively
Combustion air entrance, the combustion air entrance of rotary dryer and dry airhood (8).
The method realizing Shaft Furnace Pelletizing Process grog waste heat recovery the most according to claim 4
Device, is characterized in that: described cleaner unit uses two-stage whirlwind ash separater (6).
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