CN204730683U - New and effective sintering mine sensible heat retracting device - Google Patents
New and effective sintering mine sensible heat retracting device Download PDFInfo
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- CN204730683U CN204730683U CN201520500560.3U CN201520500560U CN204730683U CN 204730683 U CN204730683 U CN 204730683U CN 201520500560 U CN201520500560 U CN 201520500560U CN 204730683 U CN204730683 U CN 204730683U
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Abstract
The utility model discloses a kind of new and effective sintering mine sensible heat retracting device, comprise drum-type cooler, waste heat boiler, cyclone dust collector, centicell unit and pre-economizer, the high-temperature flue gas producing 650-750 DEG C after the high temperature sintering ore deposit of 750-850 DEG C enters drum-type cooler enters waste heat boiler, waste heat boiler produces the flue gas of superheated steam and 168-180 DEG C to high-temperature flue gas heat exchange, flue gas enters pre-economizer after centicell unit, and the low-temperature flue gas that pre-economizer produces enters drum-type cooler.The utility model adopts sealing and circulating cooling process, and high temperature sintering ore deposit cools in drum type cooling device, produces high-temperature hot air and is transported to waste heat boiler, produce superheated steam, for generating; Meanwhile, cooling recirculation system adopts totally-enclosed form, improves waste heat recovery product quality and quantity, adopts two-stage dust removal technology mode, also improves the recovery utilization rate of breeze, also protect environment.
Description
Technical field
The utility model relates to solid high-temperature material physical thermal (sensible heat) recovery and utilization technology field, especially relates to a kind of new and effective sintering mine sensible heat retracting device.
Background technology
In iron and steel enterprise, the energy consumption of sintering circuit is only second to ironmaking, and sintering waste heat accounts for the 10-20% of sintering plant revamp, occupies the second, is generally about 10% of iron and steel enterprise's total energy consumption.Although China's sintering energy consumption declines to some extent in recent years, the average energy consumption of key enterprise's sintering circuit is 66.42kgce/t, but still higher than about 30% (20kgce/t) of advanced country in the world level, therefore, the efficiency utilization of sintering waste heat resource is energy-saving and cost-reducing vital beyond doubt to iron and steel enterprise.In sintering circuit, the high efficiente callback of sintering machine tail bellows flue gas and sintering mine sensible heat is a difficult problem of urgently capturing with generating.
From the research of the domestic and international recycling to sintering waste heat, sintering circuit Thermal Balance Test, moisture evaporation heat dissipation accounts for 18.2%, and decomposition of limestone heat accounts for 15.2%, and sintering mine sensible heat accounts for 28.2%, and waste gas sensible heat accounts for 31.8%.In the waste heat recovery of usual sintering circuit, the sensible heat (25-45%) that only sintering mine sensible heat (10-20%) and sintering cooling exhaust are taken away accounts for about 60% of the whole heat expenditure of sintering.Owing to sintering the temperature not high (generally lower than 400 DEG C) of cooling exhaust, belong to low grade residual heat, Iron and Steel Enterprises in China was paid attention to not, substantially without recovery to the utilization of this part heat energy in the past.But in fact sinter cooling exhaust and not only measure greatly that (ton ore deposit cooling air quantity is 2000-2200m
3, be greater than 200,000 m
3/ h), and can be also large for the heat reclaimed, the best part in the used heat that its sensible heat and the part Dou Shi iron and steel enterprise that may be recovered discharge, if the complementary energy wherein more than 15% effectively can be reclaimed, not only sintering plant revamp can be reduced, and decreasing the pollution of flue gas to environment, its income is considerable.Therefore, how temperature counterpart is implemented to this middle-low temperature heat and reclaim and effective cascade utilization, become the energy-conservation important channel of China's sintering circuit and development trend.
China's existing sintering deposit cooling is general adopts ring-like belt process for cooling, and adopt Wind Volume heat of cooling sintering mineral aggregate, the cooling air quantity (mark state) of average sintering deposit per ton is generally 2000-2200m
3/ t.The different types of cooling, also there is length cool time, and the cooling air quantity that air blast cools sintering deposit per ton is 2340m
3, the air-blast cooled time is generally about 60min, and the time of exhausting cooling is generally about 30min, but cooling air quantity (mark state) is generally 3500-4800m
3/ t, the residual heat resources amount of producing the generation of 1t sintering deposit is 1439.36M J.Wherein, the residual heat resources amount of sintering mine sensible heat and sinter fume accounts for 70.87% and 29.13% respectively, and present sinter fume residual heat resources are also recycled.In addition, in sintering deposit residual heat resources, China's 1,2 section of cooling exhaust that only recovered temperature is higher at present, remaining not yet reclaims.Reclaim 40.29% in cooling residual heat total amount shared by 1,2 section of cooling exhaust, diffuse 30.58% shared by 3-5 section cooling exhaust.If ignore the heat loss between sintering machine-cooler-boiler, then only reclaim 40.29% (high temperature section cooling exhaust sensible heat) of residual heat resources total amount at present, remaining 59.71% then diffuses (sinter fume accounts for 29.3%, and all the other are low-temperature zone cooling exhaust sensible heat).
According to existing sintering deposit process for cooling technology, the basic reason affecting sintering mine sensible heat recovery is:
1, between mineral aggregate and cooling air, heat exchange is insufficient, heat exchange between cooling air and sintering mineral aggregate is rely on blower fan wind-force relevant to bed of material penetration capacity, the thick cooling of the bed of material generally adopts air blast mode, cooling air will have enough blast, air quantity, just can reach good cooling effect, cause blower fan power consumption high; The air inducing type of cooling then adopts bed of material thin type formula, and cooling air is directly through the bed of material, and heat exchanger time is short, does not reach good heat transfer effect, badly influences the quality and quantity of heat-obtaining.
2, the sealing structure of belt-cooling machine or central cooler is poor, leaks out serious, makes heat-obtaining of low quality.
3, environmental pollution is serious, after central cooler hot-air out enters residual heat boiler for exchanging heat, most of flue gas by smoke stack emission in air.
4, ton mineral aggregate cooling air quantity is large, and blower fan power consumption is high.
5, central cooler heat-obtaining section is little, and a large amount of residual heat resources waste.
At present, some developed countries such as Japan, the U.S., Germany, the recovery and utilization technology of its sintering waste heat resource is very advanced, and heat utilization efficiency is up to 60-90%.And the most steel enterprise sintering UTILIZATION OF VESIDUAL HEAT IN of China obtains not too abundant, sintering waste heat utilization rate only 10-40%, main cause is that residual heat resources Land use systems is single, recuperation of heat and heat utilization efficiency lower, the main smoke discharging of sintering machine afterbody is almost utilized.
Sintering exhaust-heat boiler, as the important component part of sintering system waste heat recovery, plays effects such as reclaiming sintering deposit residual heat and energy conversion upgrading.Because sintering deposit waste heat recovery energy matter is lower, in order to most probable heat energy effective recycling, current domestic existing sintering exhaust-heat boiler mostly is two pressure technology, heat steam is pressed through for steam turbine power generation in generation, production part low-pressure steam is used for the use of boiler supply water deaerating, or be incorporated to pipe network for the production of, preheating sinter mixture and heating etc., but two pressure waste heat boiler adopts double flow water system, boiler steel amount is also large, and make its control system comparatively complicated, the evaporation capacity of high-quality steam is little, the thermal efficiency is low, the requirement that growing sintering equipment maximizes can not be adapted to.
Utility model content
The utility model is in order to solve a difficult problem for waste heat recovery in the cooling of current sintering deposit, in order to improve sintering mine sensible heat heat recovery rate, provide a kind of new and effective sintering mine sensible heat retracting device, the drum-type cooler connected successively, waste heat boiler, cyclone dust collector, centicell unit and pre-economizer, described pre-economizer is connected with drum-type cooler.The high-temperature flue gas of 650-750 DEG C is produced after the high temperature sintering ore deposit of 750-850 DEG C enters drum-type cooler, waste heat boiler is entered after cyclone dust collector one-time dedusting, it is that the superheated steam of 450 DEG C is for generating that waste heat boiler produces pressure in more than 3.8MPa, temperature to high-temperature flue gas heat exchange, by the waste heat boiler flue gas of 168-180 DEG C out after centicell unit final dusting, enter pre-economizer, the saturated hot-water of the 0.2MPa that pre-economizer produces is used for feedwater deaeration or other process water of waste heat boiler.Enter drum-type cooler by pre-economizer low-temperature flue gas out again to recycle.
Preferably, described drum-type cooler comprises cylindrical shell, and the axis of described cylindrical shell and horizontal line are 30 ° of inclination angles, the low side of cylindrical shell be provided with low-temperature flue gas entrance and low-temperature material outlet, high-end be provided with high-temperature material entrance and high-temperature flue gas outlet.
Preferably, the inwall of cylindrical shell also welds some steels and has fried plate, some steel stir-fry plates are 90 ° along cylindrical shell circumference and are separated to form four rotational lines, central shaft in cylindrical shell is also welded with steel and fries plate, enter cylindrical shell for stir-frying from high-temperature material entrance, and by the high-end mineral aggregate flowing to low side, low-temperature flue gas enters cylindrical shell from low-temperature flue gas entrance, flow through toward high-end from low side, form direct contact type heat convection with mineral aggregate.
Preferably, between centicell unit and pre-economizer, also circulating fan is provided with.
Preferably, described cyclone dust collector is the long cylindrical shell high-efficiency cyclone dust-collector of low speed adopting high temperature resistant antiwear inwall, flue gas is after passing through drum-type cooler, carry a certain amount of mineral aggregate granule dust, particle diameter is less, but proportion is comparatively large, and this cyclone dust collector can isolate the sintering deposit particle of more than 70% greater particle size, remainder fine particle thing is in the low-temperature zone in flow process, enters waste heat boiler.
Preferably, described waste heat boiler adopts single pressure vertical shaft type waste heat boiler, steam superheater wherein adopts light pipe tube bank, remaining evaporating heating surface and economizer all adopt extended surface tube to restrain, and all heating surfaces all adopt horizontally disposed, flue gas transversal flow, improves the heat transfer effect of flue gas and tube wall, and be conducive to flue gas to wash away tube bank, prevent knot ash between fin.
Preferably, the flue gas that described pre-economizer produces can reduce cooling air temperature further, and it is that the saturated hot-water of 0.2MPa passes into waste heat boiler, for feedwater deaeration or other process water of waste heat boiler that the heat reclaimed can produce pressure.
This device adopts Closed Cycle cooling process, is made up of drum-type cooler, cyclone dust collector, waste heat boiler, centicell unit, pre-economizer and high temperature circulation blower fan etc.The high temperature sintering ore deposit of 750-850 DEG C from sintering machine out, enter drum-type cooler, during mineral aggregate from top to bottom stir-fries in cooler, carry out heat exchange with cooling-air (low-temperature flue gas) from bottom to top, produce the high-temperature flue gas of 650-750 DEG C, enter the oarse-grained mineral aggregate dust in cyclone dust collector removing flue gas, then waste heat boiler is transported to, at the flue-gas temperature general control of heat boiler outlet at 160-180 DEG C, prevent steam condensation in flue gas, infringement circulating fan.In order to improve effective utilization of waste heat, after circulating fan, install a pre-economizer, further recovery waste heat, the saturated hot-water of the 0.2MPa produced by it, may be used for other Process heat, or for boiler supply water deaerating.In addition, the setting of pre-economizer is also conducive to the control cooling wind-warm syndrome.Waste heat boiler produces more than 3.8MPa, the superheated steam of 450 DEG C, is transported to Turbo-generator Set for generating.Meanwhile, cooling recirculation system adopts totally-enclosed form, improves waste heat recovery product quality and quantity, and the two-stage dust removal technology mode adopting cyclone dust collector and centicell unit to combine, also improves the recovery utilization rate of breeze, the environment of protection.
The beneficial effects of the utility model are:
1, adopt drum-type cooler, refrigerating gas sealing and circulating, solve ring cold or with cold Air Leakage, and improve the heat quality of refrigerating gas.
2, drum-type cooler is adopted, by the rotation of cylinder, drive sintering deposit overturns, make sintering deposit and the abundant contact heat-exchanging of refrigerating gas, enhance the heat transfer effect between gas and mineral aggregate, not only reduce circulating flow rate, improve the temperature of gas, the waste heat recovery quality improved, improves heat recovery efficiency more than 3 times.
3, adopt the technique of this device can effectively improve boiler inlet flue-gas temperature, corresponding boiler operating parameter also will promote, and the cycle efficieny of therrmodynamic system is also improved.If be 2.1MPa pressure, temperature is the superheated steam of 350 DEG C, and parameter brings up to that pressure is more than 3.8MPa, temperature is 450 DEG C, can increase generating efficiency 20%.
4, adopt the technique of this device to improve the seal of cooling system, the theoretical cooling air quantity of mineral aggregate per ton is by minimizing more than 50%, and corresponding fan energy consumption reduces by more than 50%.
5, the dedusting method adopting cyclone dust collector to combine with centicell unit, efficiency of dust collection can reach more than 96%, effectively reclaims the iron laden dust more than 80% of mineral material, and meanwhile, cooling system adopts Closed Cycle, and dust emission is zero-emission substantially.
6, have employed the process links of pre-economizer, one is the Outlet Gas Temperature slightly increasing waste heat boiler, prevents water vapor condensation condensation in refrigerating gas, infringement systemic circulation blower fan, two is after circulating fan, installed pre-economizer additional, can regulate and control the import cooling wind-warm syndrome of drum-type cooler.
7, adopt one-parameter high pressure waste heat boiler, simplify therrmodynamic system, the operation being convenient to system controls, and reduces construction cost and operating cost simultaneously.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is the schematic diagram of drum-type cooler.
Detailed description of the invention
All features disclosed in this description, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this description, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
New and effective sintering mine sensible heat retracting device as shown in Figure 1, the drum-type cooler connected successively, waste heat boiler, cyclone dust collector, centicell unit and pre-economizer, described pre-economizer is connected with drum-type cooler.As shown in Figure 2, described drum-type cooler comprises cylindrical shell, and the axis of described cylindrical shell and horizontal line are 30 ° of inclination angles, the low side of cylindrical shell be provided with low-temperature flue gas entrance and low-temperature material outlet, high-end be provided with high-temperature material entrance and high-temperature flue gas outlet.The inwall of cylindrical shell also welds some steels and has fried plate, some steel stir-fry plates are 90 ° along cylindrical shell circumference and are separated to form four rotational lines, central shaft in cylindrical shell is also welded with steel and fries plate, cylindrical shell is entered for stir-frying from high-temperature material entrance, and by the high-end mineral aggregate flowing to low side, low-temperature flue gas enters cylindrical shell from low-temperature flue gas entrance, is flow through from low side toward high-end, forms direct contact type heat convection with mineral aggregate.
The high temperature sintering ore deposit of 750-850 DEG C from sintering machine out, enter drum-type cooler, during mineral aggregate from top to bottom stir-fries in cooler, heat exchange is carried out with low-temperature flue gas from bottom to top, produce the high-temperature flue gas of 650-750 DEG C, enter cyclone dust collector and carry out one-time dedusting, to remove the oarse-grained mineral aggregate dust of more than 70% in flue gas, remainder fine particle thing is in the low-temperature zone in flow process, is transported to waste heat boiler with flue gas.Described waste heat boiler adopts single pressure vertical shaft type waste heat boiler, steam superheater wherein adopts light pipe tube bank, remaining evaporating heating surface and economizer all adopt extended surface tube to restrain, and all heating surfaces all adopt horizontally disposed, flue gas transversal flow, improve the heat transfer effect of flue gas and tube wall, and be conducive to flue gas tube bank is washed away, prevent knot between fin grey.It is that the superheated steam of 450 DEG C is for generating that waste heat boiler produces pressure in more than 3.8MPa, temperature to high-temperature flue gas heat exchange, by the waste heat boiler flue gas of 168-180 DEG C out after centicell unit final dusting, enter pre-economizer, the saturated hot-water of the 0.2MPa that pre-economizer produces is used for feedwater deaeration or other process water of waste heat boiler.Enter drum-type cooler by pre-economizer low-temperature flue gas out again to recycle.Pre-economizer can recovery waste heat further, and the low-temperature flue gas that pre-economizer produces enters drum-type cooler, plays the technique wind-warm syndrome of control and regulation required by cooler.In addition, pre-economizer can ensure that the flue-gas temperature of heat boiler outlet is higher than dew-point temperature, prevents the moisture in gas to condense under dew-point temperature the injury caused circulating fan.Meanwhile, cooling recirculation system adopts totally-enclosed form, improves waste heat recovery product quality and quantity, and the two-stage dust removal technology mode adopting cyclone dust collector and centicell unit to combine, also improves the recovery utilization rate of breeze, the environment of protection.
The utility model is not limited to aforesaid detailed description of the invention.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (6)
1. a new and effective sintering mine sensible heat retracting device, is characterized in that: comprise the drum-type cooler, waste heat boiler, cyclone dust collector, centicell unit and the pre-economizer that connect successively, described pre-economizer is connected with drum-type cooler.
2. new and effective sintering mine sensible heat retracting device according to claim 1, it is characterized in that: described drum-type cooler comprises cylindrical shell, the axis of described cylindrical shell and horizontal line are 30 ° of inclination angles, the low side of cylindrical shell be provided with low-temperature flue gas entrance and low-temperature material outlet, high-end be provided with high-temperature material entrance and high-temperature flue gas outlet.
3. new and effective sintering mine sensible heat retracting device according to claim 2, it is characterized in that: on the inwall of cylindrical shell, also welded some steels fry plate, some steel stir-fry plates are 90 ° along cylindrical shell circumference and are separated to form four rotational lines, central shaft in cylindrical shell is also welded with steel and fries plate, cylindrical shell is entered for stir-frying from high-temperature material entrance, and by the high-end mineral aggregate flowing to low side, low-temperature flue gas enters cylindrical shell from low-temperature flue gas entrance, flow through toward high-end from low side, form direct contact type heat convection with mineral aggregate.
4. new and effective sintering mine sensible heat retracting device according to claim 1, is characterized in that: between centicell unit and pre-economizer, be also connected with circulating fan.
5. new and effective sintering mine sensible heat retracting device according to claim 1, is characterized in that: described cyclone dust collector is the long cylindrical shell high-efficiency cyclone dust-collector of low speed adopting high temperature resistant antiwear inwall.
6. new and effective sintering mine sensible heat retracting device according to claim 1, it is characterized in that: described waste heat boiler adopts single pressure vertical shaft type waste heat boiler, steam superheater wherein adopts light pipe tube bank, remaining evaporating heating surface and economizer all adopt extended surface tube to restrain, and all heating surfaces all adopt horizontally disposed.
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| CN201520500560.3U CN204730683U (en) | 2015-07-10 | 2015-07-10 | New and effective sintering mine sensible heat retracting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969640A (en) * | 2017-04-21 | 2017-07-21 | 中国船舶重工集团公司第七O三研究所无锡分部 | Mineral hot furnace waste heat recovery recirculating system and method |
| CN109813123A (en) * | 2017-11-20 | 2019-05-28 | 高彦 | High temperature substance cooling means and high temperature substance cooling device |
| CN113295005A (en) * | 2021-01-05 | 2021-08-24 | 中冶长天国际工程有限责任公司 | Sintering cooling process and sintering cooling system |
-
2015
- 2015-07-10 CN CN201520500560.3U patent/CN204730683U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969640A (en) * | 2017-04-21 | 2017-07-21 | 中国船舶重工集团公司第七O三研究所无锡分部 | Mineral hot furnace waste heat recovery recirculating system and method |
| CN109813123A (en) * | 2017-11-20 | 2019-05-28 | 高彦 | High temperature substance cooling means and high temperature substance cooling device |
| CN113295005A (en) * | 2021-01-05 | 2021-08-24 | 中冶长天国际工程有限责任公司 | Sintering cooling process and sintering cooling system |
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