CN103435212A - Device and method for desalinating seawater by utilizing low-temperature waste heat in steel rolling - Google Patents
Device and method for desalinating seawater by utilizing low-temperature waste heat in steel rolling Download PDFInfo
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- CN103435212A CN103435212A CN2013103738499A CN201310373849A CN103435212A CN 103435212 A CN103435212 A CN 103435212A CN 2013103738499 A CN2013103738499 A CN 2013103738499A CN 201310373849 A CN201310373849 A CN 201310373849A CN 103435212 A CN103435212 A CN 103435212A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02A20/124—Water desalination
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Abstract
The invention provides a device for desalinating seawater by utilizing low-temperature waste heat in steel rolling. The device comprises a multi-stage evaporator (10), a waste heat boiler (8) connected with the multi-stage evaporator (10), a heat furnace (3) connected with the waste heat boiler (8) through an air heat exchanger (5) and a gas heat tube heat exchanger (7), a steam-water heat exchanger (24) connected with the waste heat boiler (8), a radiant panel heat collector (23) connected with the steam-water heat exchanger (24) and a seawater purification device. The invention also provides a method for realizing seawater desalination by utilizing low-temperature waste heat in steel rolling. The device and method for desalinating seawater by utilizing low-temperature waste heat in steel rolling can be used for sufficiently utilizing low-temperature waste heat in the steel rolling process and reducing energy consumption, and are simple in process and convenient to implement.
Description
Technical field
The invention belongs to the Steelmaking Energy Conservation Technologies field, particularly a kind of devices and methods therefor that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination.
Background technology
Iron And Steel Industry is being born dissolving of manufacture, the Energy conversion in production process and the recycling of steel products, social waste and is being processed the task of three kinds of recycling economy functions, the big power consumer, total energy consumption accounts for 16% left and right of whole nation total energy consumption, and energy-saving and cost-reducing is the important measures of guaranteeing sustainable development of iron and steel industry.Iron and steel enterprise, when consuming the energy, can produce the secondary energy such as by-product gas, steam again, and the discharge residual heat and energy.Fully utilize these secondary energy, fully the recovery waste heat resource has become the energy-saving and cost-reducing important means of iron and steel enterprise, is also the road of the certainty of development " recycling economy ".
In the iron and steel structure of energy consumption, the proportion that Energy Consumption of Rolling Process accounts for the iron and steel energy consumption is not high, be only 10～15%, waste heat in steel rolling production mainly includes the waste heat of stokehold steel billet and steel billet finished product, the waste heat of process furnace discharge flue gas and the steam heat of water coolant or recovery etc., wherein adopt the hot-loading and hot-conveying technology to be recovered into stokehold steel billet sensible heat, utilize waste heat preheating gas and the combustion air of senior middle school's temperature flue gas of heating furnace, recovered steam is used for generating etc., is to utilize waste heat to reduce the important means of energy consumption during steel rolling is produced.On this basis, still having the low grade residual heats such as process furnace low-temperature flue gas after finished product billet residual heat, preheating gas and combustion air not recycle, is the important channel that reduces Energy Consumption of Rolling Process therefore further recycle steel rolling low grade residual heat complementary energy resource.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of devices and methods therefor that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination.
For solving the problems of the technologies described above, the invention provides a kind of device that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination, comprise the multi-step evaporator that is connected with vacuum pump, the waste heat boiler be connected with described multi-step evaporator, the process furnace be connected with described waste heat boiler with the coal gas hot tube heat exchanger by air heat exchanger, the vapor-water heat exchanger be connected with described waste heat boiler, reach the radial lamella heat collector and the sea-water purifying device that are connected with described vapor-water heat exchanger.
Further, one side of described process furnace is provided with soaking zone the first burner group and heating zone the first burner group that supplies combustion air and coal gas to enter described process furnace, the opposite side of described process furnace is provided with soaking zone the second burner group and heating zone the second burner group that supplies combustion air and coal gas to enter described process furnace, and described inside heating furnace is provided with the first partition wall and the second partition wall.
Further, described sea-water purifying device comprises the dosing treatment unit be connected with described vapor-water heat exchanger, the water pump be connected with described dosing treatment unit, reaches the strainer be connected with described water pump.
Further, described air heat exchanger is connected with for combustion air is pressed into to the gas blower in described process furnace through described air heat exchanger.
Further, described radial lamella heat collector is arranged on the top of finished product steel billet, for reclaiming the radiant heat of finished product billet surface.
The present invention also provides a kind of method of utilizing the steel rolling low temperature exhaust heat to realize sea water desaltination, comprises the steps:
1) air after described radial lamella heat collector heating once heats and obtains low temperature seawater the pretreated seawater of the described sea-water purifying device of process in described vapor-water heat exchanger;
2) combustion air in described process furnace and gas-fired produce high-temperature flue gas, described high-temperature flue gas becomes low-temperature flue gas respectively with after combustion air and coal gas heat exchange through air heat exchanger and coal gas hot tube heat exchanger, and described low-temperature flue gas carries out second-heating to described low temperature seawater and obtains high temperature seawater in described waste heat boiler;
3), after described high temperature seawater enters the described multi-step evaporator of finding time through described vacuum pump, the low pressure evaporation forms fresh water.
The devices and methods therefor that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination provided by the invention has following advantage:
1, utilize low temperature exhaust heat to reduce Energy Consumption of Rolling Process
Utilize the low grade residual heat of the low-temperature flue gas obtained after high-temperature flue gas warm-up combustion-supporting air and coal gas, seawater is carried out to second-heating, can take full advantage of the low temperature exhaust heat in steel rolling process, reduce the energy consumption of steel rolling process.
2, technique is simple, and it is convenient to implement
Utilize vacuum pump to be found time to multi-step evaporator, realize that fresh water is produced in the low pressure evaporation of seawater, technological process is simple, and implementation process is convenient, can be used for small-scale production, workable.
3, step reclaims the energy, utilizes rationally efficient
The radiant heat that first utilizes the radial lamella heat collector to reclaim the finished product billet surface adds the warm air that warm air obtains, seawater is once heated and obtains low temperature seawater, and then utilize process furnace low-temperature flue gas out to carry out second-heating to seawater to obtain high temperature seawater, utilize like this utilization successively to reclaim the low-temp radiating heat of steel billet and the waste heat classification heating seawater of low-temperature flue gas, reasonable utilization of energy is efficient.
The accompanying drawing explanation
Fig. 1 realizes the structural representation of the device of sea water desaltination for the steel rolling low temperature exhaust heat that utilizes that the embodiment of the present invention provides.
Fig. 2 realizes the schema of the method for sea water desaltination for the steel rolling low temperature exhaust heat that utilizes that the embodiment of the present invention provides.
Embodiment
Referring to Fig. 1, the steel rolling low temperature exhaust heat that utilizes that the embodiment of the present invention provides is realized the device of sea water desaltination, comprises multi-step evaporator 10, the waste heat boiler 8 be connected with multi-step evaporator 10, the process furnace 3 be connected with waste heat boiler 8 with coal gas hot tube heat exchanger 7 by air heat exchanger 5, the vapor-water heat exchanger 24 be connected with waste heat boiler 8, reaches the radial lamella heat collector 23 and the sea-water purifying device that are connected with vapor-water heat exchanger 24.Multi-step evaporator 10 is connected with the vacuum pump 9 for multi-step evaporator 10 is found time, and after seawater enters rarefied multi-step evaporator 10, easily under the condition of low pressure, evaporation forms fresh water.Radial lamella heat collector 23 is arranged on the surface of finished product steel billet 22, for reclaiming the radiant heat on finished product steel billet 22 surfaces, radial lamella heat collector 23 is collected radiant heat and is added warm air, the air of heat once heats seawater vapor-water heat exchanger 24 is interior, improve the seawater water temperature, take full advantage of the low-temp radiating heat of steel billet, reduced Energy Consumption of Rolling Process.
Wherein, one side of process furnace 3 is provided with soaking zone the first burner group 1 and heating zone the first burner group 2 that supplies combustion air and coal gas to enter process furnace 3, the opposite side of process furnace 3 is provided with soaking zone the second burner group 14 and heating zone the second burner group 15 that supplies combustion air and coal gas to enter process furnace 3, and process furnace 3 inside are provided with the first partition wall 12 and the second partition wall 13.Enter like this combustion air and the fully mixed firing of coal gas of process furnace 3 from process furnace 3 both sides, the high-temperature flue gas produced is under the guide effect of the first partition wall 12 and the second partition wall 13, walk around the flue that the first partition wall 12 and the second partition wall 13 enter process furnace 3, become low-temperature flue gas successively after air heat exchanger 5 preheated airs and coal gas hot tube heat exchanger 7 preheating gas, low-temperature flue gas enters 8 pairs of seawater of waste heat boiler and carries out second-heating, can take full advantage of the low grade residual heat of low-temperature flue gas, further reduce the energy consumption of steel rolling process.
Wherein, sea-water purifying device comprises the dosing treatment unit 25 be connected with vapor-water heat exchanger 24, the water pump 27 be connected with dosing treatment unit 25, reaches the strainer 28 be connected with water pump 27.Seawater is avoided blocking device through filter 28 eliminations insoluble impurities wherein, the Soluble Ca Cl that the seawater after removal of impurities is removed wherein through dosing treatment unit 25
2and corrosive impurity, avoid seawater fouling and corrosion device in vapor-water heat exchanger 24, waste heat boiler 8 and multi-step evaporator 10.
Referring to Fig. 2, the steel rolling low temperature exhaust heat that utilizes that the embodiment of the present invention provides is realized the method for sea water desaltination, comprises the steps:
1) air after 23 heating of radial lamella heat collector is interior to through the pretreated seawater of sea-water purifying device, once heating and obtain low temperature seawater at vapor-water heat exchanger 24;
2) combustion air and the gas-fired that enter in process furnace 3 produce high-temperature flue gas, high-temperature flue gas becomes low-temperature flue gas respectively with after combustion air and coal gas heat exchange through air heat exchanger 5 and coal gas hot tube heat exchanger 7, and low-temperature flue gas carries out second-heating to low temperature seawater and obtains high temperature seawater waste heat boiler 8 is interior;
3), after high temperature seawater enters the multi-step evaporator 10 of finding time through vacuum pump 9, the high temperature seawater evaporation forms fresh water.
The steel rolling low temperature exhaust heat that utilizes that the embodiment of the present invention provides realizes that the process of sea water desaltination is specific as follows:
Seawater to be evaporated is after filter 28 is removed algae and suspended substance, send into dosing treatment unit 25 by water pump 27 through water valve 26, flocculation agent and the processing such as scale remover is adsorbed, precipitation, neutralization such as the gac in dosing treatment unit 25, bodied ferric sulfate and sodium glycolate, remove the CaCl in seawater
2obtain the low-corrosiveness seawater with corrosive impurity, the low-corrosiveness seawater enters vapor-water heat exchanger 24 by pipeline; Radial lamella heat collector 23 is collected the radiant heat on finished product steel billet 22 surfaces, air heating is become to warm air, warm air natural convection is in pipeline enters vapor-water heat exchanger 24, the low-corrosiveness seawater that enters vapor-water heat exchanger 24 is once heated, obtain the low temperature seawater that temperature is 30～50 ℃, low temperature seawater enters waste heat boiler 8 by pipeline.Warm air is discharged from chimney 21 in vapor-water heat exchanger 24 with after the low-corrosiveness seawater to make heat exchange.
Combustion air from gas blower 17 enters air heat exchanger 5 through air main valve 18, with high-temperature flue gas from process furnace 3, carry out after heat exchange, respectively through upper pressure lock 4 and lower pressure lock 16, by soaking zone the first burner group 1, heating zone the first burner group 2, soaking zone the second burner group 14 and heating zone the second burner group 15, entering in process furnace 3; coal gas enters coal gas hot tube heat exchanger 7 through coal gas main valve 20, with high-temperature flue gas from process furnace 3, carry out after heat exchange respectively through upper gas valve 6 and lower gas valve 19, by soaking zone the first burner group 1, heating zone the first burner group 2, soaking zone the second burner group 14 and heating zone the second burner group 15 enter in process furnace 3, the combustion air and the coal gas mixed firing that enter in process furnace 3 produce the high-temperature flue gas that temperature is 800～900 ℃, the high-temperature flue gas produced is under the guiding flue gas flow direction effect of the first partition wall 12 and the second partition wall 13, walk around the flue that the first partition wall 12 and the second partition wall 13 enter process furnace 3, high-temperature flue gas enters air heat exchanger 5 by pipeline and carries out the heat exchange preheated air with the air that enters process furnace 3 through air heat exchanger 5 from process furnace 3 is discharged, then the coal gas that coal gas of high temperature enters coal gas hot tube heat exchanger 7 and enters process furnace 3 through coal gas hot tube heat exchanger 7 by pipeline carries out the heat exchange preheating gas, high-temperature flue gas becomes the low-temperature flue gas of 200～300 ℃ of temperature after the heat exchange of twice.Low-temperature flue gas enters waste heat boiler 8, and the low temperature seawater entered in waste heat boiler 8 is carried out to second-heating, and obtaining temperature is 70～90 ℃ of high temperature seawaters.Low-temperature flue gas is discharged from chimney 21 in waste heat boiler 8 with after the low temperature seawater heat exchange.
The high-temperature flue gas that the interior combustion air of process furnace 3 and gas-fired produce carries out through air heat exchanger 5, coal gas hot tube heat exchanger 7, waste heat boiler 8 process that heat exchange becomes low-temperature flue gas successively, and its flue-gas temperature control requires as shown in table 1.
The temperature control requirement of the flue gas that table 1 process furnace produces
After high temperature seawater enters multi-step evaporator 10, multi-step evaporator 10 is found time by vacuum pump 9, after the evaporation of high temperature seawater low pressure, condensation, becomes 40～50 ℃ of fresh water, and the fresh water of formation recycles for steel mill through outlet valve 11 outputs.
The steel rolling low temperature exhaust heat that utilizes that the embodiment of the present invention provides realizes in the process of sea water desaltination, and the temperature of seawater and the control of main component require as shown in table 2.
The temperature of table 2 seawater and main component are controlled requirement
By table 2, can find out, seawater after purification carries out a temperature after heating through air-water heat exchanger can reach 30～50 ℃, after waste heat boiler carries out second-heating, temperature can reach 70～90 ℃ again, the seawater of last 70～90 ℃ enters multi-step evaporator evaporative condenser under the condition of decompression can access the fresh water of 40～50 ℃, for steel mill self.
The devices and methods therefor that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination provided by the invention, resource situation in conjunction with the rolling system low temperature exhaust heat, the high-temperature flue gas warm-up combustion-supporting air of process furnace generation and the low temperature exhaust heat after coal gas have been recycled, and the radiant heat of recycling finished product billet surface, the classification heating seawater, realize the seawater multistage evaporation and produce the fresh water process, having reduced to greatest extent the energy consumption of steel rolling process, having realized the reasonably optimizing utilization of iron and steel resource.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. a device that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination, is characterized in that: comprise the multi-step evaporator (10) that is connected with vacuum pump (9), the waste heat boiler (8) be connected with described multi-step evaporator (10), the process furnace (3) be connected with described waste heat boiler (8) with coal gas hot tube heat exchanger (7) by air heat exchanger (5) successively, the vapor-water heat exchanger (24) be connected with described waste heat boiler (8), reach the radial lamella heat collector (23) and the sea-water purifying device that are connected with described vapor-water heat exchanger (24).
2. the device that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination according to claim 1, it is characterized in that: a side of described process furnace (3) is provided with soaking zone the first burner group (1) and heating zone the first burner group (2) that supplies combustion air and coal gas to enter described process furnace (3), the opposite side of described process furnace (3) is provided with soaking zone the second burner group (14) and heating zone the second burner group (15) that supplies combustion air and coal gas to enter described process furnace (3), described process furnace (3) inside is provided with the first partition wall (12) and the second partition wall (13).
3. the device that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination according to claim 1 is characterized in that: described sea-water purifying device comprises the dosing treatment unit (25) be connected with described vapor-water heat exchanger (24), the water pump (27) be connected with described dosing treatment unit (25), and the strainer (28) that is connected with described water pump (27).
4. the device that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination according to claim 1 is characterized in that: described air heat exchanger (5) is connected with for combustion air is pressed into to the gas blower (17) in described process furnace (3) through described air heat exchanger (5).
5. the device that utilizes the steel rolling low temperature exhaust heat to realize sea water desaltination according to claim 1, it is characterized in that: described radial lamella heat collector (23) is arranged on the top of finished product steel billet (22), for reclaiming the radiant heat on finished product steel billet (22) surface.
6. a method of utilizing the described device of claim 1 to realize sea water desaltination, is characterized in that: comprise the steps:
1) air after described radial lamella heat collector (23) heating once heats and obtains low temperature seawater the pretreated seawater of the described sea-water purifying device of process in described vapor-water heat exchanger (24);
2) combustion air in described process furnace (3) and gas-fired produce high-temperature flue gas, described high-temperature flue gas becomes low-temperature flue gas respectively with after combustion air and coal gas heat exchange through air heat exchanger (5) and coal gas hot tube heat exchanger (7), and described low-temperature flue gas carries out second-heating to described low temperature seawater and obtains high temperature seawater in described waste heat boiler (8);
3), after described high temperature seawater enters the described multi-step evaporator (10) of finding time through described vacuum pump (9), the low pressure evaporation forms fresh water.
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| RU2137722C1 (en) * | 1998-07-13 | 1999-09-20 | Московский энергетический институт (Технический университет) | Method for thermochemical desalting of natural and waste waters |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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