CN102628090A - Energy-saving and consumption-reducing method for air supply system of metallurgy blast furnace - Google Patents
Energy-saving and consumption-reducing method for air supply system of metallurgy blast furnace Download PDFInfo
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- CN102628090A CN102628090A CN201210119680XA CN201210119680A CN102628090A CN 102628090 A CN102628090 A CN 102628090A CN 201210119680X A CN201210119680X A CN 201210119680XA CN 201210119680 A CN201210119680 A CN 201210119680A CN 102628090 A CN102628090 A CN 102628090A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/032—Separating slag from liquid, e.g. from water, after quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/074—Tower structures for cooling, being confined but not sealed
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses an energy-saving and consumption-reducing method for an air supply system of a metallurgy blast furnace. Processing air is delivered into a rotary dehumidifier through an air filter for air dehumidifying, required regenerating wind of the rotary dehumidifier is heated to above 60 DEG C while residual heat of slag washing water of the blast furnace is used as a heat source, the processing air is heated from ambient temperature to less than 50 DEG C at the same time, and cooled slag washing water is reused in blast furnace slag washing process for cyclic utilization. The processing air is further heated to 1200 DEG C through a preheater I, a blower, a preheater II and a hot-blast stove and sent to the metallurgy blast furnace. The method of the invention fully utilizes the residual heat of the originally discharged slag washing water, decreases discharge of the residual heat of the slag washing water, and reduces thermal pollution to environment. Cooling equipment of a cooling tower is canceled while rotary dehumidifying equipment replaces original cooling dehumidifying system, thereby realizing energy saving and consumption reduction for the air supply system of the blast furnace and achieving dual objectives of energy saving and emission reduction.
Description
Technical field
The invention relates to metallurgy high furnace, particularly the air feed system of metallurgy high furnace.
Background technology
At present, metallurgy high furnace is the high-energy equipment that field of metallurgy is produced, and it is the air dewetting pre-heating system that the fuel combustion of blast furnace needs air feed system, and the energy-saving potential of this system is very big.
The traditional method of blast furnace air dewetting pre-heating system is to utilize refrigeration techniques that air is implemented cooling; Requirement according to the dehumidifying degree cools to 5-10 ℃ with ambient air; Make airborne moisture curding out under cryogenic condition, utilize mineral to heat afterwards again and promote AT, thereby obtain the exsiccant preheated air; The air heating that will dehumidify more afterwards heats up and compression, sends in the blast furnace.
In addition, the discharging enormous amount of blast furnace self flushing cinder water, the waste heat supply temperature of flushing cinder water discharging generally more than 80 degree, has caused serious energy dissipation and environmental pollution thus.How to utilize existing resource, realize the energy-saving and cost-reducing of blast furnace dehumidifying pre-heating system, reach the double goal of energy-saving and emission-reduction, this is an important process that can not be ignored.
Summary of the invention
The object of the invention; Be the energy consumption height that overcomes prior art, the shortcoming of complex equipments; Save expensive refrigeration techniques equipment and corresponding energy consumption thereof, utilize simultaneously discharging flushing cinder water waste heat regeneration desiccant wheel with add warm air, a kind of process method of new metallurgy high furnace air feed system is provided.
The energy-saving method of metallurgy high furnace air feed system of the present invention has following steps:
(1) will handle air and get into rotary dehumidifier enforcement air dewetting through air filter; Waste heat with blast furnace slag quenching water is heated to the required regeneration wind of rotary dehumidifier more than 60 degree as thermal source; Guarantee the continuous dehumidifying operation of rotary dehumidifier; Simultaneously, will handle air by envrionment temperature be heated to＜50 ℃; Reusing flushing slag water after the cooling recycles in blast furnace slag flushing technology;
(2) step (1) is heated to 45 ℃ processing air and sends into preheater I, as the heating thermal source, will handle air and further be heated to 65～80 ℃ with the waste heat of blast furnace slag quenching water; Reusing flushing slag water after the cooling recycles in blast furnace slag flushing technology;
(3) step (2) is heated to 65～80 ℃ processing air and sends into gas blower, gas blower will be handled the air compression, make to handle atmosphere temperature rising to 180 ℃;
(4) step (3) is heated to 180 ℃ processing air and sends into preheater II, preheater II will handle air heating to 300 ℃ through conventional type of heating;
(5) step (4) is heated to 300 ℃ and handles air and send into hotblast stove, hotblast stove further will be handled air heating to 1200 ℃ through conventional type of heating, send into metallurgy high furnace.
The waste heat supply temperature of the blast furnace slag quenching water of said step (1) is 60～90 ℃.
The invention has the beneficial effects as follows; Utilize rotary wheel dehumidifying method and blast furnace slag quenching water waste heat regeneration runner and add the method for warm air; The using exhaust heat of slag flushing water of former discharging is fully used, has reduced the quantity discharged of using exhaust heat of slag flushing water simultaneously, alleviated thermal pollution environment.Cancelled the cooling tower cooling system, and replaced original refrigerant dehumidification system, realized the energy-saving and cost-reducing of blast furnace air feed system, reached the double goal of energy-saving and emission-reduction with the rotary wheel dehumidifying equipment.
Comprehensive benefit analysis
(1) original blast furnace air supply system utilizes the electric energy dehumidifying, and the higher-grade energy has been saved in the used heat dehumidifying of new techniques make use blast furnace slag quenching water, has reduced the thermal pollution of environment;
(2) original blast furnace air supply system utilizes the high energy cooling to reach air dewetting, and there is not temperature-fall period in new system, has saved the heat energy consumption of this part;
(3) using exhaust heat of slag flushing water is used as the first step heating that blast furnace is blown, has saved the original heat that adds of this warm area;
(4) the blast furnace slag quenching water heat is used for blast furnace air supply system, can reduce the quantity discharged of using exhaust heat of slag flushing water;
The refrigeration of (5) having saved complex and expensive is initially equipped, and replaces the rotary wheel dehumidifying equipment of simple less energy-consumption, has saved operational and administrative expenses;
Economic and Efficiency Analysis
(1) the average moisture removal of this programme is pressed 9g/Nm3 calculating, and coke ratio can reduce 6.3kg/t iron, amounts to 6.12kgce/tfe; Calculated in 6500 hours with the dehumidifying operation whole year, it is 1,500,000 tons that blast furnace produces the iron amount, can increase production capacity 0.9%.
(2) average moisture removal press 9g/Nm3 and is calculated, and the heat of consumption was 42.7kJ when these moisture were heated to 1200 ℃ by 20 ℃ in hotblast stove; In blast furnace, be an endothermic process with charcoal generation chemical reaction, the heat of consumption is 65.65kJ, and two add up to heat dissipation 108.35kJ.Calculate with dehumidifying operation 6500h, blast furnace blast amount 90000Nm3/h, the heat that this part moisture consumes in hotblast stove and blast furnace is 6.338x1011kJ, amounts to standard coal equivalent about 2164t, is worth about 2,590,000 yuan.
(3) utilize refrigeration to dehumidify to need refrigerating duty for Q '=90000 * 0.3093 * (31-5)=72.4 ten thousand kilocalories/time (840kWh); Get the COP=3 of unit cooler, unit cooler operation power consumption 280kWh then, condensate pump power consumption 40 kilowatt-hours in addition, then the refrigeration system operation energy consumption is counted roughly 320 kilowatt-hours.Calculated in 6500 hours with whole year operation, total electric flux is 2,080,000 degree.If the electricity charge are 0.8 yuan/degree, then save 166.4 ten thousand yuan of the electricity charge.
Description of drawings
Fig. 1 is the schema of traditional blast furnace air feed system;
Fig. 2 is the energy-saving method schema of blast furnace air feed system of the present invention.
Embodiment
Fig. 1 is the schema of traditional blast furnace air feed system, can be found out by Fig. 1, and traditional blast furnace air feed system is to utilize refrigeration techniques that air is implemented cooling; Requirement according to the dehumidifying degree cools to 5-10 ℃ with ambient air; Make airborne moisture curding out under cryogenic condition, utilize mineral to heat afterwards again and promote AT, thereby obtain the exsiccant preheated air; The air heating that will dehumidify more afterwards heats up and compression, sends in the blast furnace.
Fig. 2 is the schema of blast furnace air feed system of the present invention, can be found out by Fig. 2, and the present invention is to use the rotary wheel dehumidifying equipment to replace original refrigerant dehumidification system, and utilizes heat exchanger apparatus, and waste heat in the flushing cinder water is taken out, and makes flushing cinder water be able to the reuse of lowering the temperature.The heat that takes out partly is used for to guarantee the lasting works better of rotary dehumidifier, the moisture that dehumidifies being discharged in the atmosphere as the required regeneration air heating of rotary wheel dehumidifying equipment; The using exhaust heat of slag flushing water of rest part is proceeded heat temperature raising to the dry air after being processed, and reaches the heating limit that waste heat supply temperature allows, and waste heat is fully utilized.Flushing cinder water after the cooling need not through cooling tower, but direct reuse guarantees that flushing cinder water cycle amount satisfies the requirement of blast furnace production technique.
Specific examples of the present invention reaches as follows:
Basic condition: one in 500 cubic metres of blast furnaces, 85-90 ℃ of flushing cinder water temp, 160 tons/time;
Preheated air amount: 75000 cubic metres to 90000 cubic metres/hour.
Blast furnace slag quenching water is the industrial colling that recycles, and recycling was used after slagging-off hot water need be cooled to 60 ℃ through cooling tower, caused a large amount of waste heats to be discharged in the atmosphere.Fall and flow rate calculation according to the flushing cinder water temperature, the waste heat that is discharged in the atmosphere has (by 90 ℃ of calculating):
Q=160 * 1000 * (90-60)=4,800,000 kilocalories/time (about 5600kWh)
Because the restriction of flushing cinder water temp, the air waste heat supply temperature is up to 80 ℃, and it is following to calculate (by 90000 cubic metres of/hour calculating) required preheating of air heat Calculation to the air waste heat amount of 500 cubes of blast furnaces:
Q '=90000 * 0.3093 * (80-25)=1,530,000 kilocalories/time (1748kWh)
Or: Q '=90000 * 0.3093 * (80-31)=1,360,000 kilocalories/time (1424kWh)
The heat requirement Q ' of calculation display preheated air institute is far smaller than the available heat Q of flushing cinder water.
The rotary dehumidifier of present embodiment is selected the HTM type for use, and air filter is for carrying auxiliary products.Preheater and hotblast stove are Tianjin Huaneng Energy Equipment Co., Ltd.'s product.
New blast furnace air-supply dehumidifying heating means are to adopt rotary wheel dehumidifying technology to accomplish.The moisture absorbing of the desiccant wheel of processing by means of sorbing material, when the wet air of handling when needs passed desiccant wheel, airborne moisture was absorbed by desiccant wheel, discharges dry air and accomplishes initial procedure.The moisture that contains in the runner simultaneously need constantly be discharged in the atmosphere, guarantees the lasting wettability power of runner, and this process is to rely on the regeneration air of comparatively high temps to pass the runner completion.Therefore regeneration air need be heated to more than 60 ℃.And the temperature of blast furnace slag quenching water is 60～90 ℃, therefore is enough to satisfy the temperature requirements of regeneration air heating.
The principle of work of rotary wheel dehumidifying technology is following:
Handle air and get into rotary dehumidifier enforcement air dewetting through air filter; Simultaneously with the waste heat of blast furnace slag quenching water as thermal source will handle air by envrionment temperature be heated to＜50 ℃; And the required regeneration wind of rotary dehumidifier is heated to more than 60 degree, guarantee the continuous dehumidifying operation of rotary dehumidifier; Reusing flushing slag water after the cooling recycles in blast furnace slag flushing technology;
Processing air after the heating is sent into preheater I, continue waste heat with blast furnace slag quenching water, will handle air and further be heated to 65～80 ℃ as the heating thermal source; Reusing flushing slag water after the cooling recycles in blast furnace slag flushing technology;
The processing air that is heated to 65～80 ℃ is sent into gas blower, and gas blower will be handled the air compression, make it to 180 ℃; Send into preheater II again, will handle air heating to 300 ℃, the type of heating of this moment adopts conventional interchanger type of heating.
To be heated to 300 ℃ of processing air and send into hotblast stove, and further be heated to 1200 ℃, and send into metallurgy high furnace at last, the type of heating of this moment adopts conventional high temperature hot-blast furnace type of heating.
Because new dehumidification mode does not reduce AT, preheating quantity is reduced, produce the energy saving effect of the first step; Owing to use the regeneration thermal source of part blast furnace slag quenching water heat as dehumidifier, cause the electric energy of former unit cooler devices consume to obtain saving, this is second one a energy saving effect; Owing to use part blast furnace slag quenching water heat as the preheating thermal source, can save original indirect heating energy consumption, produce the 3rd one energy saving effect; Since after the part heat of blast furnace slag quenching water is used for blast furnace air supply system, original flushing cinder hydro-thermal load is reduced greatly, the decline that brings flushing cinder water cooling energy consumption thus, and this is the 4th step energy saving effect.Energy consumption and waste heat discharge that its total effect can make blast furnace produce reduce.
Claims (2)
1. the energy-saving method of a metallurgy high furnace air feed system has following steps:
(1) will handle air and get into rotary dehumidifier enforcement air dewetting through air filter; Waste heat with blast furnace slag quenching water is heated to the required regeneration wind of rotary dehumidifier more than 60 degree as thermal source; Guarantee the continuous dehumidifying operation of rotary dehumidifier; Simultaneously, will handle air by envrionment temperature be heated to＜50 ℃; Reusing flushing slag water after the cooling recycles in blast furnace slag flushing technology.
(2) step (1) is heated to 45 ℃ processing air and sends into preheater I, as the heating thermal source, will handle air and further be heated to 65～80 ℃ with the waste heat of blast furnace slag quenching water; Reusing flushing slag water after the cooling recycles in blast furnace slag flushing technology;
(3) step (2) is heated to 65～80 ℃ processing air and sends into gas blower, gas blower will be handled the air compression, make to handle atmosphere temperature rising to 180 ℃;
(4) step (3) is heated to 180 ℃ processing air and sends into preheater II, preheater II will handle air heating to 300 ℃ through conventional type of heating;
(5) step (4) is heated to 300 ℃ and handles air and send into hotblast stove, hotblast stove further will be handled air heating to 1200 ℃ through conventional type of heating, send into metallurgy high furnace.
2. according to the energy-saving method of the metallurgy high furnace air feed system of claim 1, it is characterized in that the waste heat supply temperature of the blast furnace slag quenching water of said step (1) is 60～90 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210119680.XA CN102628090B (en) | 2012-04-20 | 2012-04-20 | Energy-saving and consumption-reducing method for air supply system of metallurgy blast furnace |
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| CN201210119680.XA CN102628090B (en) | 2012-04-20 | 2012-04-20 | Energy-saving and consumption-reducing method for air supply system of metallurgy blast furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111663014A (en) * | 2020-07-07 | 2020-09-15 | 河北津西钢铁集团重工科技有限公司 | Low-energy-consumption metallurgical blast furnace equipment |
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| JPS5278604A (en) * | 1975-12-25 | 1977-07-02 | Sanki Eng Co Ltd | Dehumidifier for compressed air to be inserted into blast furnace |
| JPS52148865A (en) * | 1976-06-04 | 1977-12-10 | Mitsui Eng & Shipbuild Co Ltd | Blast dehumidifier for blast furnace |
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| CN101368221A (en) * | 2008-07-28 | 2009-02-18 | 洪国伟 | Dehumidification air feeding device for ironmaking blast furnace |
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| CN101798607A (en) * | 2010-03-11 | 2010-08-11 | 无锡市东方环境工程设计研究所有限公司 | Waste heat recovery system of blast furnace slag quenching water |
| CN102367497A (en) * | 2011-11-01 | 2012-03-07 | 杭州哲达科技股份有限公司 | Blast furnace blowing energy-saving and efficiency-enhancing integration technology |
| CN202193794U (en) * | 2011-08-28 | 2012-04-18 | 云南丰普科技有限公司 | Two-stage cooling and dehumidifying device |
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2012
- 2012-04-20 CN CN201210119680.XA patent/CN102628090B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278604A (en) * | 1975-12-25 | 1977-07-02 | Sanki Eng Co Ltd | Dehumidifier for compressed air to be inserted into blast furnace |
| JPS52148865A (en) * | 1976-06-04 | 1977-12-10 | Mitsui Eng & Shipbuild Co Ltd | Blast dehumidifier for blast furnace |
| JPS56163729A (en) * | 1980-05-20 | 1981-12-16 | Sumitomo Metal Ind Ltd | Dehumidifying method of air for combustion |
| CN101368221A (en) * | 2008-07-28 | 2009-02-18 | 洪国伟 | Dehumidification air feeding device for ironmaking blast furnace |
| JP3155552U (en) * | 2009-09-10 | 2009-11-19 | 栄一 浦谷 | Compressed air dehumidifier for blast furnace |
| CN101792830A (en) * | 2010-01-26 | 2010-08-04 | 北京首钢国际工程技术有限公司 | Method and device for collecting steam of flushing cinder and afterheat of hot water in iron-making blast furnace |
| CN101798607A (en) * | 2010-03-11 | 2010-08-11 | 无锡市东方环境工程设计研究所有限公司 | Waste heat recovery system of blast furnace slag quenching water |
| CN202193794U (en) * | 2011-08-28 | 2012-04-18 | 云南丰普科技有限公司 | Two-stage cooling and dehumidifying device |
| CN102367497A (en) * | 2011-11-01 | 2012-03-07 | 杭州哲达科技股份有限公司 | Blast furnace blowing energy-saving and efficiency-enhancing integration technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111663014A (en) * | 2020-07-07 | 2020-09-15 | 河北津西钢铁集团重工科技有限公司 | Low-energy-consumption metallurgical blast furnace equipment |
| CN111663014B (en) * | 2020-07-07 | 2021-11-05 | 河北津西钢铁集团重工科技有限公司 | Low-energy-consumption metallurgical blast furnace equipment |
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