CN101655320A - Grading recycling and cascade utilization method of residual heat resources in sintering process and device thereof - Google Patents
Grading recycling and cascade utilization method of residual heat resources in sintering process and device thereof Download PDFInfo
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- CN101655320A CN101655320A CN200910187381A CN200910187381A CN101655320A CN 101655320 A CN101655320 A CN 101655320A CN 200910187381 A CN200910187381 A CN 200910187381A CN 200910187381 A CN200910187381 A CN 200910187381A CN 101655320 A CN101655320 A CN 101655320A
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Abstract
The invention relates to a method for effectively recycling and utilizing residual heat resources in a sintering process and a device thereof. The invention has the main contents that a fiery sinter ore is filled in a vertical and sealed tank body, air is led from the tank body so as to cool the sinter ore, sensible heat of the sinter ore is almost totally carried by the air and is exhausted fromthe top of the tank body at the same time; and hot air is led into a residual heat boiler to generate steam to synchronously generate power. Compared with the prior sintering residual heat recycling and utilization technology, the invention has higher residual heat recycling utilization ratio, effectively reduces the energy consumption of the sintering procedure with reasonable and effective method, simple apparatus and easy operation, and is relatively favorable for popularization and application in the technical field of residual heat resource recycling and utilization in a metallurgy process.
Description
Technical field:
The invention belongs to the metallurgical process residual heat resources and reclaim and utilize technical field, in particularly a kind of sintering process, the high efficiente callback of cryogenic waste heat resource and the method and the device thereof of utilization based on energy-saving and emission-reduction.
Background technology:
The sintering process residual heat resources (are called for short sintering waste heat, down with) mainly form by two parts: a part is to come from sintering machine afterbody, temperature to be about 800 ℃～950 ℃ entrained sensible heats of sintering deposit be the sintering deposit sensible heat, and this part sensible heat accounts for 70% of sintering process residual heat resources total amount; Another part comes from the sinter fume sensible heat of sintering machine master smoke discharging pipe, and this part accounts for 30% of residual heat resources total amount.The high efficiente callback of sintering waste heat is one of major measure that further reduces the sintering circuit energy consumption with utilizing.Comparatively speaking, in two kinds of residual heat resources, sintering deposit sensible heat quantity is bigger, and quality is higher, and it can be entrained by air dielectric; And sinter fume sensible heat quantity is less, quality lower (the sinter fume mean temperature is 150 ℃～200 ℃), and composition more complicated, especially SO
2, O
2, NOx and dust etc. change along sintering machine length.Based on this, the high efficiente callback of sintering deposit sensible heat is that whole sintering waste heat reclaims and the core and the emphasis that utilize with utilizing.
At present, China and even in the world, the structural parameters of cooler and the design of operating parameter be only based on the monomer effect to the sintering deposit cooling, and almost not have the recycling of consideration to the sintering deposit sensible heat; In other words, the structure of cooler and operating parameter have been difficult to adapt to the high efficiente callback and the utilization of sintering deposit sensible heat at present, and cooler exists unsurmountable drawback on sensible heat reclaims and utilizes, mainly show as:
(1) the cooler existence of leaking out makes the sintering deposit sensible heat scatter and disappear in a large number, makes that simultaneously being used for air-blast cooled air blast power consumption increases.Leaking out of cooler mainly is present in two positions: a position is the slit of cooling off between chassis and the blower conduits, here, normal temperature air is to the cooling system external leakage, and air leak rate of air curtain () is about 20%～35%, and this will make the power that motor consumed of air blast increase by 25%～35% approximately; Another position is the slit between cooling chassis and the wind-collecting cover, and here, the hot-air that carries the sintering deposit sensible heat is to system's external leakage, and air leak rate of air curtain is about 10%～15%, and this will make the generated energy of sintering waste heat reduce by 10%～15%.
(2) cooler belt structure only reclaims the higher part of temperature (generally more than 300 ℃) sintering deposit sensible heat, has slatterned the sintering deposit sensible heat resource of temperature than lower part.At present, between sintering deposit and the air mobile cross-flow gas-particle heat transfer, on the sintering deposit traffic direction, the sintering deposit temperature progressively reduces on the cooler, and hot air temperature also progressively reduces.When hot air temperature is lower than 250 ℃ even when being lower than 300 ℃, its economy that is used to generate electricity has been difficult to guarantee.Through preresearch estimates, at present, only there is the sintering deposit sensible heat of 45%～55$% to be reclaimed, all the other make an appointment with the residual heat resources of half to waste.
Summary of the invention:
Goal of the invention: exist at existing cooler leak out, the sintering deposit sensible heat can only be partially recycled etc. drawback, the present invention proposes the method and the device thereof of residual heat resources classification recovery and cascade utilization in a kind of sintering process, its objective is can overcome cooler in the past leak out the cooling that causes with reclaim the problem that thermal resource efficient reduces, can overcome the problem that in the past cooler can only the recovery section thermal source again, it can all be recycled the sintering deposit sensible heat.
Technical scheme: the present invention is achieved through the following technical solutions:
The method of residual heat resources classification recovery and cascade utilization in a kind of metallurgy sintered process is characterized in that: red-hot sintering deposit is encased in the tank body of a vertical sealing, the temperature of sintering deposit is 800 ℃～950 ℃; Feed normal temperature air from this tank base then, the ratio of air mass flow and sintering deposit treating capacity is that gas-solid ratio is 2000: 2500Nm
3/ t, red-hot sintering deposit is fully contacted with air in this tank body to be cooled off, cooled sintering deposit is discharged by tank base, then discharge with the air that carries the sintering deposit complete sensible heat after sintering deposit fully contacts from tank body top, and through feeding waste heat boiler production steam after the dedusting, the steam of production is incorporated steam pipe system into or is generated electricity; And be that the air themperature of carrying the sintering deposit sensible heat of coming out after the waste heat boiler heating is reduced to 150 ℃～200 ℃, behind this air process final dusting, air after the dedusting circulating fan of then flowing through pressurizes, enter then in the feed water preheater that is arranged on the waste heat boiler supply line and carry out preheating, and the air that this air comes out in feed water preheater afterwards by pipeline and external complement together carries out periodic duty again from the bottom enters the tank body of vertical sealing for the water inlet of waste heat boiler.
Water in the waste heat boiler supply line passes through the feed water preheater preheating again through behind the desalination, carrying out deoxygenation then handles, sent into through boiler economizer by boiler feed pump at last and be used for producing superheated steam in the waste heat boiler, superheated steam enters steam turbine, and steam turbine drives generator for electricity generation; And that all lower steam of the temperature and pressure that comes out from steam turbine enters in the supply line of boiler once more is recycling.
The device of residual heat resources classification recovery and cascade utilization in a kind of aforesaid sintering process is characterized in that: this device mainly comprises tank body, waste heat boiler, disposable dust remover, secondary filter, the feed water preheater of vertical sealing and is connected the pipeline of above device; The top of the tank body of described vertical sealing is provided with the sintering deposit import, and the bottom is provided with outlet of cold ore deposit and extraneous air air inlet; The top of the tank body of vertical sealing also is connected to waste heat boiler by disposable dust remover and pipeline, and the top of waste heat boiler then is provided with the steam gas outlet of discharging for superheated steam; The bottom of waste heat boiler is provided with the gas outlet of discharging for the air that carries the sintering deposit sensible heat, and this gas outlet is connected to secondary filter by pipeline, and secondary filter is provided with and effluxes mouth, and secondary filter also is connected to feed water preheater by blower fan and pipeline; Feed water preheater then is connected to the bottom of the tank body of vertical sealing by pipeline with the extraneous air air inlet.
The inside of the tank body of described vertical sealing is divided into prestore band and salband, and the band that prestores is arranged on the top of salband; The Leng Kuang exit of the tank body of described vertical sealing is provided with the rotatory sealing valve.
Described feed water preheater is arranged on the supply line of waste heat boiler, also is provided with oxygen-eliminating device on described supply line, and described oxygen-eliminating device is provided with the low-pressure steam air inlet pipeline.
Advantage and effect: the invention provides residual heat resources classification recovery and cascade utilization method in the sintering process, in this method under the prerequisite that satisfies the requirement of sintering deposit process for cooling, red-hot sintering deposit is encased in the tank body of a vertical sealing, the temperature of red-hot sintering deposit is between 800 ℃～950 ℃, feed the normal temperature air of certain flow then from the bottom of the tank body of this vertical sealing, the ratio of air mass flow and sintering deposit treating capacity is that gas-solid ratio is 2000: 2500Nm
3/ t fully contacts air with red-hot sintering deposit in the tank body of this vertical sealing, through evidence, the ratio of air mass flow and sintering deposit treating capacity reaches 2000: 2500Nm
3In the time of/t, the cooling effect of sintering deposit is best in addition, that is to say this ratio air and the violent heat transmission of sintering deposit generation in addition, makes sintering deposit cool off rapidly, satisfies the process for cooling requirement; Cooled sintering deposit is discharged by the tank base of vertical sealing, then discharge with the air that carries the sintering deposit complete sensible heat after sintering deposit fully contacts from the tank body top, produce steam in the waste heat boiler through feeding after the dedusting, steam is incorporated steam pipe system into or is generated electricity; And be reduced to 150 ℃～200 ℃ from the air themperature of carrying the sintering deposit sensible heat that waste heat boiler comes out, through behind the final dusting, the fraction gas that is filtered enters atmosphere, and filtering the remaining most of gas in back is that preheating is carried out in the feedwater of waste heat boiler through entering feed water preheater after the circulating fan pressurization then; And will accelerate through the speed that the water of preheating enters conversion steam in the boiler, so also help increasing work efficiency greatly, do not allow the lower air sensible heat waste of temperature simultaneously yet.And be that air after the preheating is carried out in the feedwater of waste heat boiler and the air by pipeline and external complement together reenters in the tank body.
The present invention simultaneously also provides and has been that the device of this method special use, this device mainly comprise tank body, waste heat boiler, disposable dust remover, secondary filter, the feed water preheater of vertical sealing and be connected the above pipeline that installs; The top of the tank body of described vertical sealing is provided with the sintering deposit import, the bottom is provided with outlet of cold ore deposit and extraneous air air inlet, the top of the tank body of vertical sealing also is connected to waste heat boiler by disposable dust remover and pipeline, the top of waste heat boiler then is provided with the steam gas outlet of discharging for superheated steam, the bottom of waste heat boiler is provided with the gas outlet of discharging for the air that carries the sintering deposit sensible heat, this gas outlet is connected to secondary filter by pipeline, secondary filter is provided with and effluxes mouth, and secondary filter also is connected to feed water preheater by blower fan and pipeline; Feed water preheater then is connected to the bottom of the tank body of vertical sealing by pipeline.
This method and apparatus reclaims with existing sintering waste heat and compares with utilizing technology, maximum characteristics are to have overcome from the source inadequate natural endowment of existing cooler, can effectively avoid the problem of leaking out of cooler, the major part that realizes the sintering deposit sensible heat reclaims, both consider the cooling of sintering deposit, considered the high efficiente callback of sintering deposit sensible heat again.Be embodied as:
Avoided the problem of leaking out of cooler from the source, made that the cooling device of sintering deposit is simple in structure, operation is convenient, has changed complex structure, the loaded down with trivial details situation of operation that traditional cooler brings by leaking out, and simultaneously, the particle when having avoided the sintering deposit cooling pollutes.
Realized the most recovery of sintering deposit sensible heat from the source, overcome the higher sintering waste heat resource drawback of traditional cooler recovered temperature, changed that cooler only limits to the sintering deposit cooling and situation that can not the high efficiente callback sensible heat.
Having improved the hot-air quality of carrying the sintering deposit sensible heat from the source is temperature, has overcome the drawback of the lower and instability of flow of traditional cooler production steam quality, thereby lays a good foundation for the subsequent production steam quality improves a ton sintering deposit generated energy.
This method is reasonable, and is efficient, and equipment is succinctly easy to operate, relatively is beneficial in the metallurgical process residual heat resources to reclaim and utilize technical field to apply.
Description of drawings
Fig. 1 is the schematic diagram of technological process of the present invention and equipment.
The specific embodiment:
Below the present invention is described further:
The invention provides the method and the device thereof of residual heat resources classification recovery and cascade utilization in a kind of sintering process, be illustrated in figure 1 as the schematic diagram of technological process of the present invention and equipment; Device as shown in FIG. mainly comprises tank body 1, waste heat boiler 2, disposable dust remover 3, secondary filter 4, the feed water preheater 5 of vertical sealing and is connected the pipeline of above device; The top of the tank body 1 of described vertical sealing is provided with the sintering deposit import, the sintering deposit import is provided with lid, the bottom of the tank body 1 of vertical sealing is provided with outlet 15 of cold ore deposit and extraneous air air inlet 17, the top of the tank body 1 of vertical sealing also is connected to waste heat boiler 2 by disposable dust remover 3 and pipeline, the top of waste heat boiler 2 then is provided with the steam gas outlet 14 of discharging for superheated steam, and this steam gas outlet 14 is connected to steam turbine or steam pipe system when in use.The bottom of waste heat boiler 2 is provided with the gas outlet of discharging for the air that carries the sintering deposit sensible heat, this gas outlet is connected to secondary filter 4 by pipeline, secondary filter 4 is provided with and effluxes mouth 6, and secondary filter 4 also is connected to feed water preheater 5 by blower fan 7 and pipeline on the other hand; 5 of feed water preheaters are connected to the bottom of the tank body 1 of vertical sealing with extraneous air air inlet 17 by pipeline.
The method of utilizing this device to implement is as follows:
Red-hot sintering deposit from the sintering machine afterbody comes out is received by receiving hopper, and promptly sintering deposit drops in the receiving hopper; Receiving hopper is raised the top that device is promoted to the tank body 1 of vertical sealing, move to the position corresponding to the top center of the tank body 1 of vertical sealing then with sintering deposit import 16, at this moment, the lid at tank body 1 top of vertical sealing is opened, simultaneously the receiving hopper bottom gate is opened automatically, and beginning is by the sintering deposit import 16 at tank body 1 top of the vertical sealing sintering deposit of packing into; After sintering deposit had been adorned, elevator was mentioned automatically, and receiving hopper is sent into the sintering machine afterbody, prepared to receive the sintering deposit of next batch, during this period, and the cover closing at tank body 1 top of vertical sealing.The inside of the tank body 1 of described vertical sealing is divided into prestoring is with 8 and salband 9, the top that prestores and be arranged on salband 9 with 8.
The temperature of red-hot sintering deposit between 800 ℃～950 ℃, red-hot sintering deposit prestore be with 8 to stay for some time after, along with the carrying out of tank body 1 discharge of vertical sealing progressively moves down into salband; Fed the normal temperature air of certain flow then by the extraneous air air inlet 17 of the bottom of the tank body 1 of vertical sealing, the ratio of air mass flow and sintering deposit treating capacity is that gas-solid ratio is 2000: 2500Nm
3/ t fully contacts air with red-hot sintering deposit in the tank body of this vertical sealing, through evidence, the ratio of air mass flow and sintering deposit treating capacity reaches 2000: 2500Nm
3In the time of/t, the cooling effect of sintering deposit is best in addition, that is to say that this ratio can make air and sintering deposit that violent heat transmission takes place, and makes sintering deposit cool off rapidly, satisfies the process for cooling requirement; At salband, sintering deposit is cooled off by carrying out exchange heat with the extraneous air that comes from tank base, through being arranged on the rotatory sealing valve 10 discharge tank bodies that cold ore deposit exports 15 places, sends into finished product bin then again.
The air that is used for the sintering deposit cooling, be sent in the tank body by tank base, temperature is raise after tank body salband and red-hot sintering deposit carry out exchange heat, become the air that carries the sintering deposit sensible heat of high temperature, the air that carries the sintering deposit sensible heat of high temperature is discharged by tank body 1 top of vertical sealing and is heated for waste heat boiler 2 production steam through entering behind the disposable dust remover 3 in the waste heat boiler 2 then, promptly with waste heat boiler 2 in water or after steam carried out exchange heat, temperature was reduced to 150 ℃～200 ℃; Then, the air that carries the sintering deposit sensible heat that temperature reduces flows out through the gas outlet of the bottom of waste heat boiler 2, enter in the secondary filter 4 by pipeline, a part of then gas effluxes through effluxing mouth 6, efflux gas accounts for 20%～40% of gas gross, enter in the feed water preheater 5 after remaining gas is then pressurizeed through circulating fan 7 by pipeline and heat for the water that are about to enter in the waste heat boiler 2, together reenter the tank body 1 of vertical sealing recycling by pipeline and the new extraneous air that replenishes then from the bottom, so far realize the recycling of net quantity of heat, improved resource utilization greatly.
And described feed water preheater 5 is arranged on the supply line 11 of waste heat boiler 2, on described supply line 11, also be provided with oxygen-eliminating device 12, described oxygen-eliminating device 12 is provided with low-pressure steam air inlet pipeline 13, and low-pressure steam air inlet pipeline 13 is connected with steam turbine when in use.Water in the supply line 11 of described waste heat boiler 2 through desalination, through passing through oxygen-eliminating device 12 deoxygenations again after feed water preheater 5 preheatings, send in the waste heat boiler 2 through boiler economizer by boiler feed pump then, then in waste heat boiler, produce superheated steam, superheated steam enters steam turbine, and steam turbine drives generator for electricity generation; The all lower steam of temperature and pressure that comes out from steam turbine is that exhaust steam is then entered by low-pressure steam air inlet pipeline 13 once more and is able to recyclingly in the supply line 11 of waste heat boiler 2, has so further utilized resource, has improved operating efficiency; And the water in the supply line 11 of waste heat boiler 2 is through preheating, when so entering in the waste heat boiler 2, will have certain temperature, like this in the quality that guaranteed the superheated steam that waste heat boiler 2 produces, also save the energy greatly, improved operating efficiency.
Principal character of the present invention is: red-hot sintering deposit is packed in the tank body of vertical sealing, then from the tank body bubbling air, make sintering deposit cool off rapidly, the sensible heat of sintering deposit is almost all carried by air and is discharged by the tank body top simultaneously; Hot-air feeds waste heat boiler production steam and generates electricity by way of merging two or more grid systems.
The present invention reclaims with existing sintering waste heat and compares with utilizing technology, and it has higher heat recovery rate, and effectively reduces the sintering circuit energy consumption, and it has the following advantages:
1, overcome traditional drawback that cooler leaks out from the source, so that the cooling device structure of sintering deposit Simply, operation is convenient, has changed complex structure, the loaded down with trivial details situation of operation that traditional cooler brings by leaking out, Particulate Pollution when simultaneously, having avoided the sintering deposit cooling;
2, realize the aobvious most recovery of sintering deposit, it is higher to have overcome traditional cooler recovered temperature Sintering waste heat resource drawback has changed that cooler only limits to the sintering deposit cooling and office that can not the high efficiente callback sensible heat Face.
3, improved the hot-air quality of carrying sintering mine sensible heat, overcome traditional cooler and produced the steam product The drawback of the lower and instability of flow of matter, thus for improving a ton sintering deposit generated energy, the subsequent production steam quality beats Lower good basis.
4, by periodic duty, improve the rate of recycling of resource, when increasing work efficiency, advance one Step high the utilization rate of heat energy.
The method is reasonable, and efficient, equipment is succinctly easy to operate, relatively is beneficial in the metallurgical process residual heat resources to reclaim With utilize technical field and apply.
Claims (5)
1, the method for residual heat resources classification recovery and cascade utilization in a kind of metallurgy sintered process is characterized in that: red-hot sintering deposit is encased in the tank body of a vertical sealing, the temperature of sintering deposit is 800 ℃～950 ℃; Feed normal temperature air from this tank base then, the ratio of air mass flow and sintering deposit treating capacity, that is: gas-solid ratio is 2000: 2500Nm
3/ t, red-hot sintering deposit is fully contacted with air in this tank body to be cooled off, cooled sintering deposit is discharged by tank base, then discharge with the air that carries the sintering deposit complete sensible heat after sintering deposit fully contacts from tank body top, and through feeding waste heat boiler production steam after the dedusting, the steam of production is incorporated steam pipe system into or is generated electricity; And be that the air themperature of carrying the sintering deposit sensible heat of coming out after the waste heat boiler heating is reduced to 150 ℃～200 ℃, behind this air process final dusting, air after the dedusting circulating fan of then flowing through pressurizes, enter then in the feed water preheater that is arranged on the waste heat boiler supply line and carry out preheating, and the air that this air comes out in feed water preheater afterwards by pipeline and external complement together carries out periodic duty again from the bottom enters the tank body of vertical sealing for the water inlet of waste heat boiler.
2, the method for residual heat resources classification recovery and cascade utilization in the sintering process according to claim 1, it is characterized in that: the water in the waste heat boiler supply line passes through the feed water preheater preheating again through behind the desalination, carrying out deoxygenation then handles, send into through boiler economizer by boiler feed pump at last and be used for producing superheated steam in the waste heat boiler, superheated steam enters steam turbine, and steam turbine drives generator for electricity generation; And that all lower steam of the temperature and pressure that comes out from steam turbine enters in the supply line of boiler once more is recycling.
3, the device of residual heat resources classification recovery and cascade utilization in a kind of sintering process as claimed in claim 1 is characterized in that: this device mainly comprises tank body (1), waste heat boiler (2), disposable dust remover (3), secondary filter (4), the feed water preheater (5) of vertical sealing and is connected the pipeline of above device; The top of the tank body of described vertical sealing (1) is provided with sintering deposit import (16), and the bottom is provided with cold ore deposit outlet (15) and extraneous air air inlet (17); The top of the tank body of vertical sealing (1) also is connected to waste heat boiler (2) by disposable dust remover (3) and pipeline, and the top of waste heat boiler (2) then is provided with the steam gas outlet (14) of discharging for superheated steam; The bottom of waste heat boiler (2) is provided with the gas outlet of discharging for the air that carries the sintering deposit sensible heat, this gas outlet is connected to secondary filter (4) by pipeline, secondary filter (4) is provided with and effluxes mouthful (6), and secondary filter (4) also is connected to feed water preheater (5) by blower fan (7) and pipeline; Feed water preheater (5) then is connected to the bottom of the tank body (1) of vertical sealing by pipeline with extraneous air air inlet (17).
4, the device of residual heat resources classification recovery and cascade utilization in the sintering process according to claim 3, it is characterized in that: the inside of the tank body of described vertical sealing (1) is divided into prestore band (8) and salband (9), and the band (8) that prestores is arranged on the top of salband (9); The cold ore deposit outlet (15) of the tank body of described vertical sealing (1) locates to be provided with rotatory sealing valve (10).
5, according to the device of residual heat resources classification recovery and cascade utilization in claim 3 or the 4 described sintering processes, it is characterized in that: described feed water preheater (5) is arranged on the supply line (11) of waste heat boiler (2), also be provided with oxygen-eliminating device (12) on described supply line (11), described oxygen-eliminating device (12) is provided with low-pressure steam air inlet pipeline (13).
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