CN103435212B - 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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- CN103435212B CN103435212B CN201310373849.9A CN201310373849A CN103435212B CN 103435212 B CN103435212 B CN 103435212B CN 201310373849 A CN201310373849 A CN 201310373849A CN 103435212 B CN103435212 B CN 103435212B
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- 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 Steelmaking Energy Conservation Technologies field, particularly a kind of devices and methods therefor utilizing steel rolling low temperature exhaust heat to realize sea water desaltination.
Background technology
Iron And Steel Industry carries the task of process three kinds of recycling economy functions of dissolving of Energy conversion in the manufacture of steel products, production process and recycling, social waste, big power consumer, total energy consumption accounts for about 16% of whole nation total energy consumption, and energy-saving and cost-reducing is the important measures guaranteeing sustainable development of iron and steel industry.Iron and steel enterprise, while the consumption energy, can produce the secondary energy such as by-product gas, steam again, and discharge residual heat and energy.Fully utilize these secondary energy, abundant 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 iron and steel structure of energy consumption, the proportion that Energy Consumption of Rolling Process accounts for iron and steel energy consumption is not high, be only 10 ~ 15%, waste heat in Rolling production mainly includes waste heat, the process furnace discharge waste heat of flue gas and the steam heat etc. of water coolant or recovery of stokehold steel billet and steel billet finished product, hot-loading and hot-conveying technology is wherein adopted to be recovered into stokehold steel billet sensible heat, to 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 the important means utilizing waste heat to reduce energy consumption in Rolling production.On this basis, still there are the low grade residual heats such as the process furnace low-temperature flue gas after finished product billet residual heat, preheating gas and combustion air not recycle, therefore recycle the important channel that steel rolling low grade residual heat waste energy resource is reduction Energy Consumption of Rolling Process further.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of devices and methods therefor utilizing 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 utilizing steel rolling low temperature exhaust heat to realize sea water desaltination, comprise the multi-step evaporator being connected with vacuum pump, the waste heat boiler be connected with described multi-step evaporator, the process furnace, the vapor-water heat exchanger be connected with described waste heat boiler and the radial lamella heat collector be connected with described vapor-water heat exchanger that are connected with described waste heat boiler by air heat exchanger and coal gas hot tube heat exchanger and sea-water purifying device.
Further, the side of described process furnace is provided with the soaking zone first burner group and the heating zone first burner group that enter described process furnace for combustion air and coal gas, the opposite side of described process furnace is provided with the soaking zone second burner group and the heating zone second burner group that enter described process furnace for combustion air and coal gas, and described inside heating furnace is provided with the first partition wall and the second partition wall.
Further, the described sea-water purifying device strainer that comprises the agent-feeding treatment device be connected with described vapor-water heat exchanger, the water pump be connected with described agent-feeding treatment device and be connected with described water pump.
Further, described air heat exchanger is connected with the gas blower for being pressed into through described air heat exchanger by combustion air in described process furnace.
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.
Present invention also offers a kind of method utilizing steel rolling low temperature exhaust heat to realize sea water desaltination, comprise the steps:
1) air after described radial lamella heat collector heating obtains low temperature seawater to once heating through the pretreated seawater of described sea-water purifying device 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) described high temperature seawater enters after the described multi-step evaporator of described vacuum pump, and low pressure evaporation forms fresh water.
The devices and methods therefor utilizing steel rolling low temperature exhaust heat to realize sea water desaltination provided by the invention, tool has the following advantages:
1, low temperature exhaust heat is utilized to reduce Energy Consumption of Rolling Process
The low grade residual heat of the low-temperature flue gas obtained after utilizing high-temperature flue gas warm-up combustion-supporting air and coal gas, carries out second-heating to seawater, can make full use of the low temperature exhaust heat in steel rolling process, reduces the energy consumption of steel rolling process.
2, technique is simple, and it is convenient to implement
Utilize vacuum pump to find time to multi-step evaporator, fresh water is produced in the low pressure evaporation realizing seawater, and 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 first utilizing radial lamella heat collector to reclaim 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, such utilization utilizes the waste heat progressive solution seawater of low-temp radiating heat and the low-temperature flue gas reclaiming steel billet successively, and reasonable utilization of energy is efficient.
Accompanying drawing explanation
The steel rolling low temperature exhaust heat that utilizes that Fig. 1 provides for the embodiment of the present invention realizes the structural representation of the device of sea water desaltination.
The steel rolling low temperature exhaust heat that utilizes that Fig. 2 provides for the embodiment of the present invention realizes the schema of the method for sea water desaltination.
Embodiment
See Fig. 1, what the embodiment of the present invention provided utilizes steel rolling low temperature exhaust heat to realize 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, the vapor-water heat exchanger 24 be connected with waste heat boiler 8 and the radial lamella heat collector 23 be connected with vapor-water heat exchanger 24 that are connected with waste heat boiler 8 by air heat exchanger 5 and coal gas hot tube heat exchanger 7 and sea-water purifying device.Multi-step evaporator 10 is connected with the vacuum pump 9 for finding time to multi-step evaporator 10, 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 surface, radial lamella heat collector 23 is collected radiant heat and is added warm air, the air of heat once heats seawater in vapor-water heat exchanger 24, improve seawater water temperature, take full advantage of the low-temp radiating heat of steel billet, reduce Energy Consumption of Rolling Process.
Wherein, the side of process furnace 3 is provided with the soaking zone first burner group 1 and the heating zone first burner group 2 that enter process furnace 3 for combustion air and coal gas, the opposite side of process furnace 3 is provided with the soaking zone second burner group 14 and the heating zone second burner group 15 that enter process furnace 3 for combustion air and coal gas, and process furnace 3 inside is provided with the first partition wall 12 and the second partition wall 13.Entering the combustion air of process furnace 3 and coal gas like this from process furnace 3 both sides can fully mixed firing, 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, low-temperature flue gas is become successively after air heat exchanger 5 preheated air and coal gas hot tube heat exchanger 7 preheating gas, low-temperature flue gas enters waste heat boiler 8 pairs of seawater and carries out second-heating, the low grade residual heat of low-temperature flue gas can be made full use of, reduce further the energy consumption of steel rolling process.
Wherein, the sea-water purifying device strainer 28 that comprises the agent-feeding treatment device 25 be connected with vapor-water heat exchanger 24, the water pump 27 be connected with agent-feeding treatment device 25 and be connected with water pump 27.Seawater avoids blocking device through filter 28 elimination insoluble impurities wherein, and the seawater after removal of impurities removes Soluble Ca Cl wherein through agent-feeding treatment device 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.
See Fig. 2, what the embodiment of the present invention provided utilizes steel rolling low temperature exhaust heat to realize the method for sea water desaltination, comprises the steps:
1) air after radial lamella heat collector 23 heats obtains low temperature seawater to once heating through the pretreated seawater of sea-water purifying device in vapor-water heat exchanger 24;
2) combustion air in process furnace 3 and gas-fired generation high-temperature flue gas is entered, 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 in waste heat boiler 8;
3), after high temperature seawater enters the multi-step evaporator 10 of finding time through vacuum pump 9, high temperature seawater evaporation forms fresh water.
The process of steel rolling low temperature exhaust heat realizes sea water desaltination that what the embodiment of the present invention provided utilize is specific as follows:
Seawater to be evaporated removes after algae and suspended substance through filter 28, agent-feeding treatment device 25 is sent into through water valve 26 by water pump 27, the process such as the flocculation agents such as the gac in agent-feeding treatment device 25, bodied ferric sulfate and sodium glycolate and scale remover carry out adsorbing, precipitate, neutralization, the CaCl in removing seawater
2obtain low-corrosiveness seawater with corrosive impurity, low-corrosiveness seawater enters vapor-water heat exchanger 24 by pipeline; Radial lamella heat collector 23 collects the radiant heat on finished product steel billet 22 surface, air heating is become warm air, warm air natural convection enters in vapor-water heat exchanger 24 through pipeline, the low-corrosiveness seawater entering vapor-water heat exchanger 24 is once heated, obtain the low temperature seawater that temperature is 30 ~ 50 DEG C, 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 low-corrosiveness seawater to make heat exchange.
Combustion air from gas blower 17 enters air heat exchanger 5 through air main valve 18, to carry out after heat exchange, respectively through upper pressure lock 4 and lower pressure lock 16, entering in process furnace 3 by soaking zone first burner group 1, heating zone first burner group 2, soaking zone second burner group 14 and heating zone second burner group 15 with the high-temperature flue gas from process furnace 3; coal gas enters coal gas hot tube heat exchanger 7 through coal gas main valve 20, carry out after heat exchange respectively through upper gas valve 6 and lower gas valve 19 with the high-temperature flue gas from process furnace 3, by soaking zone first burner group 1, heating zone first burner group 2, soaking zone second burner group 14 and heating zone second burner group 15 enter in process furnace 3, enter combustion air in process furnace 3 and coal gas mixed firing produces the high-temperature flue gas that temperature is 800 ~ 900 DEG C, 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 after discharging from process furnace 3 and carries out heat exchange preheated air with the air entering process furnace 3 through air heat exchanger 5, then coal gas of high temperature enters coal gas hot tube heat exchanger 7 by pipeline and carries out heat exchange preheating gas with the coal gas entering process furnace 3 through coal gas hot tube heat exchanger 7, high-temperature flue gas becomes the low-temperature flue gas of temperature 200 ~ 300 DEG C after the heat exchange of twice.Low-temperature flue gas enters waste heat boiler 8, carries out second-heating to the low temperature seawater entered in waste heat boiler 8, and obtaining temperature is 70 ~ 90 DEG C of high temperature seawaters.Low-temperature flue gas is discharged from chimney 21 in waste heat boiler 8 Yu after low temperature seawater heat exchange.
The high-temperature flue gas that in process furnace 3, combustion air 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 overflow is 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, becomes 40 ~ 50 DEG C of fresh water after the evaporation of high temperature seawater low pressure, condensation, and the fresh water of formation exports through outlet valve 11 and recycles for steel mill.
What the embodiment of the present invention provided utilizes steel rolling low temperature exhaust heat to realize in the process of sea water desaltination, the temperature of seawater and the control overflow of main component as shown in table 2.
The temperature of table 2 seawater and main component control overflow
Can be found out by table 2, seawater after purification carries out a temperature after heating through air-water heat exchanger can reach 30 ~ 50 DEG C, carry out temperature after second-heating through waste heat boiler again and can reach 70 ~ 90 DEG C, the seawater of last 70 ~ 90 DEG C enter multi-step evaporator at reduced pressure evaporative condenser can obtain the fresh water of 40 ~ 50 DEG C, for steel mill self.
The devices and methods therefor utilizing steel rolling low temperature exhaust heat to realize sea water desaltination provided by the invention, in conjunction with the resource situation of rolling system low temperature exhaust heat, recycled process furnace produce high-temperature flue gas warm-up combustion-supporting air and coal gas after low temperature exhaust heat, and recycle the radiant heat of finished product billet surface, progressive solution seawater, realize seawater multistage evaporation and produce fresh water process, reducing the energy consumption of steel rolling process to greatest extent, the reasonably optimizing achieving iron and steel resource utilizes.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. the device utilizing steel rolling low temperature exhaust heat to realize sea water desaltination, it is characterized in that: comprise the multi-step evaporator (10) being connected with vacuum pump (9), the waste heat boiler (8) be connected with described multi-step evaporator (10), pass through the process furnace (3) that air heat exchanger (5) is connected with described waste heat boiler (8) with coal gas hot tube heat exchanger (7) successively, the vapor-water heat exchanger (24) be connected with described waste heat boiler (8), and the radial lamella heat collector (23) to be connected with described vapor-water heat exchanger (24) and sea-water purifying device, the side of described process furnace (3) is provided with soaking zone first burner group (1) and heating zone first burner group (2) that enter described process furnace (3) for combustion air and coal gas, the opposite side of described process furnace (3) is provided with soaking zone second burner group (14) and heating zone second burner group (15) that enter described process furnace (3) for combustion air and coal gas, described process furnace (3) inside is provided with the first partition wall (12) and the second partition wall (13).
2. the device utilizing steel rolling low temperature exhaust heat to realize sea water desaltination according to claim 1, is characterized in that: the strainer (28) that described sea-water purifying device comprises the agent-feeding treatment device (25) be connected with described vapor-water heat exchanger (24), the water pump (27) be connected with described agent-feeding treatment device (25) and is connected with described water pump (27).
3. the device utilizing 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 the gas blower (17) for being pressed into through described air heat exchanger (5) by combustion air in described process furnace (3).
4. the device utilizing 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.
5. utilize device described in claim 1 to realize a method for sea water desaltination, it is characterized in that: comprise the steps:
1) air after described radial lamella heat collector (23) heating obtains low temperature seawater to once heating through the pretreated seawater of described sea-water purifying device 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), low pressure evaporation forms fresh water.
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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 |