CN107806769B - Method and device for recycling heat energy of molten metallurgical slag - Google Patents
Method and device for recycling heat energy of molten metallurgical slag Download PDFInfo
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- CN107806769B CN107806769B CN201710791717.6A CN201710791717A CN107806769B CN 107806769 B CN107806769 B CN 107806769B CN 201710791717 A CN201710791717 A CN 201710791717A CN 107806769 B CN107806769 B CN 107806769B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
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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
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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
- Y02P10/25—Process efficiency
Abstract
The invention relates to a method and a device for recycling heat energy of molten metallurgical slag; at least comprises a molten metallurgical slag heat energy recovery process and a heat energy utilization process for recovering heat energy from molten metallurgical slag to generate high-temperature gas; the heat energy recovery of the molten metallurgical slag at least comprises a molten metallurgical slag granulation process for rapidly cooling the molten metallurgical slag flowing out of a metallurgical furnace to generate granulated metallurgical slag particles and a granulated particle cooling process for further cooling the granulated metallurgical slag particles obtained in the metallurgical slag granulation process; blowing off the molten metallurgical slag by using granulating airflow, dividing the molten metallurgical slag into large particle areas and small particle areas in the particle flying-out direction, and respectively collecting the large particle areas and the small particle areas; the small particles directly enter the cooling or other heat exchange process of the granulated particles, the large particles enter the secondary granulation process, and the secondary granulation adopts a mode that air or water or a mixture of water and air directly contacts with the large particles. Realizes material recycling of the molten metallurgical slag and high-value utilization of heat energy, and provides a method for energy conservation, emission reduction, consumption reduction and efficiency improvement of metallurgy.
Description
Technical Field
The invention relates to a method and a device for recovering high-grade and low-cost heat energy of molten metallurgical slag and utilizing the high value of the molten metallurgical slag, in particular to a method and a device for granulating the molten metallurgical slag and producing high-temperature gas by granulated particles to improve the air temperature of a hot blast stove, save fuel or be used as other heat sources, belonging to the fields of metallurgical energy and energy recovery and utilization and environmental protection.
Background
In the iron-making, steel-making and pyrometallurgical nonferrous metallurgy processes of the metallurgical industry, a large amount of high-temperature molten metallurgical slag can be generated, such as blast furnace slag and steel slag generated in an iron-making furnace, copper slag, lead slag, zinc slag and the like generated in nonferrous metallurgy, the tapping temperature is usually about 1400-1600 ℃, and 350-480 kg of metallurgical slag can be generated in each 1 ton of metal, so that the recovery and utilization of the waste heat of the metallurgical slag have important significance for energy conservation and emission reduction of the metallurgical industry and energy efficiency improvement. However, the development of the slag waste heat recovery technology is hindered by low heat conductivity coefficient, low heat exchange speed, discontinuous slag discharge and the like of the metallurgical slag. The existing metallurgical furnace basically adopts a water quenching method to treat molten slag generated in the smelting process, the water-slag ratio is 8-15, a large amount of water resources are consumed, and a large amount of heat energy is also lost.
In response, scientists have sought various dry heat recovery techniques for recovering the sensible heat from the molten slag, such as air quenching, tumbling, and centrifugal granulation. In the air quenching method, molten slag discharged from a blast furnace flows into a granulating area, and is blown up by a high-speed air flow to be micronized. Most slag particles are cooled to 800 ℃ by cooling air blown from the lower part in the falling process and then discharged, large-particle slag is screened out by a hot screen, and then the slag particles enter a multi-section fluidized bed and are secondarily cooled to about 150 ℃ by air. The hot air recovered by the air quenching method can be used for power generation, but the power consumption is large in the granulation process, and the required equipment is large; the granulated slag obtained by primary air quenching is often accompanied by large particles, which is not beneficial to subsequent treatment.
The roller method is that the slag flows to a roller which rotates continuously to drive the slag to form a sheet shape to be adhered to the roller, the cooling fluid which is introduced into the roller is cooled rapidly to obtain solid slag with high vitrification rate, the solid slag is scraped by a scraper, and the recovered heat energy is used for generating electricity. The method can ensure that the molten slag is rapidly cooled to obtain the vitreous body, but has the advantages of low processing capacity, low equipment operation rate, large metallurgical slag particles, high crushing energy consumption and low grade of recovered heat energy.
The centrifugal granulation method is that molten slag flows to the center of a turntable with a variable speed, is granulated and thrown out at the edge of the turntable under the action of centrifugal force, is cooled in flying and falling, and obtains hot air. However, the turntable is easy to break down when rotating at high speed in a high-temperature environment, is difficult to maintain and is difficult to realize long-term stable operation.
For the cooling of the molten metallurgical slag, in order to ensure that the cooled slag granules have a vitreous structure and can be used for cement production, the granulation and cooling of the molten metallurgical slag must be completed quickly in a short time, so the outstanding difficulty of the rapid cooling dry granulation technology lies in the consideration of both the cooling rate of the granulated slag and the waste heat recovery effect.
In addition, there are various ways to utilize the heat energy recovered from the molten metallurgical slag, such as using in boilers, power generation, hot blast stove to produce hot air, etc. The method is an effective way for generating electricity, but the heat utilization efficiency for generating electricity is relatively low, and in many cases, large power generation equipment is needed, so that the economic benefit of heat energy recycling is greatly influenced. In the metallurgical production process, hot air with the temperature of over 1000 ℃ is usually needed to provide heat, and the improvement of the temperature of the hot air can reduce the fuel ratio of the metallurgical furnace, improve the utilization efficiency of the metallurgical furnace, improve the yield and reduce the cost. Therefore, the improvement of the temperature of the hot air has important significance for reducing the energy consumption of the whole iron and steel nonferrous industry. However, the preheating temperature of blast furnace gas and combustion air is limited by the exhaust gas temperature of the hot blast stove and the working temperature of the heat pipe, so that the problems of low air supply temperature and energy consumption generally exist at present. Therefore, if the high-temperature molten slag can be used as a preheating heat source, the energy conservation and consumption reduction of the metallurgical process are important. At the same time, however, the recovery medium must have a high temperature in order to achieve a high-quality utilization of the recovered heat. The two links of heat energy recovery and heat energy utilization of the metallurgical slag are combined to achieve the purposes that the whole process and the system are high in value, high in efficiency and low in cost and can be widely applied. Therefore, the high-value and low-cost utilization of the heat energy recovered from the molten metallurgical slag is another important technical link related to whether the heat energy recovery and utilization of the metallurgical slag can be widely applied.
The invention aims to develop an effective method and a device for recovering and applying the waste heat of the metallurgical slag under the conditions of ensuring that the metallurgical slag is rapidly granulated to form a vitreous body and not influencing the subsequent cement raw material, thereby realizing the purposes of recovering the waste heat of the metallurgical slag with high quality and low cost, improving the granulation speed and effect, improving the waste heat recovery rate and the subsequent utilization rate thereof and reducing the equipment manufacturing cost and the operation cost.
Disclosure of Invention
The invention aims to provide a method and a device for rapidly cooling and granulating molten metallurgical slag, recovering high-grade heat of the granulated particles, and generating high-temperature gas for improving the wind temperature of a hot blast stove, saving fuel or being used as other heat sources such as power generation and the like. The invention adopts high-speed airflow to granulate the molten metallurgical slag, carries out secondary granulation on large particles, granulated gas preheating and the like to realize the quick granulation of the molten metallurgical slag and simultaneously generate high-temperature hot gas, ensures the vitreous body structure of the slag, lays a foundation for the subsequent utilization of the metallurgical slag, uses the recycled hot gas as combustion-supporting air for producing high-temperature air by a hot blast stove, improves the air temperature of metallurgical furnace entering by a full-quantity medium-temperature hot air mode and a component high-temperature air-preposed combustion matching mode respectively to reduce the coke ratio, saves fuel gas or is used for the heat utilization of other ways. The invention realizes high-efficiency low-cost heat energy recovery and high-value utilization under the condition of ensuring metallurgical slag resource utilization, has obvious economic benefit and provides a technical means for solving the technical and economic problems in the field. The method and the device have the characteristics of good molten metallurgical slag granulation effect, high hot product level, simple equipment, convenience in operation, low investment and operation cost and the like.
The invention is realized by adopting the following technical scheme:
the method for recycling the heat energy of the molten metallurgical slag is characterized in that the process for recycling the heat energy of the molten metallurgical slag at least comprises a process for recycling the heat energy of the molten metallurgical slag to generate high-temperature gas and a process for utilizing the heat energy; the process of recovering the heat energy of the molten metallurgical slag at least comprises a molten metallurgical slag granulation process of rapidly cooling the molten metallurgical slag flowing out of a metallurgical furnace to generate granulated metallurgical slag particles and a granulated particle cooling process of further cooling the granulated metallurgical slag particles obtained in the metallurgical slag granulation process; in the process of granulating the molten metallurgical slag, granulating airflow blows off the molten metallurgical slag to form granulated metallurgical slag particles, and the granulated metallurgical slag particles are divided into large particle areas and small particle areas in the flying-out direction of the particles, fall and are respectively collected; the small particles directly enter a granulating particle cooling process or other heat exchange processes, the large particles enter a secondary granulating process, and the secondary granulating process is realized by adopting a mode that air or water or a mixture of water and air directly contacts with the large particles.
The method for recycling the heat energy of the molten metallurgical slag is characterized in that the granulating air flow is preheated before the granulating air flow enters the blowing-off process of the molten metallurgical slag, the preheating adopts an indirect mode, the preheating heat source of the granulating air flow is hot gas generated by secondary granulation or hot gas generated by cooling the outer wall of a granulator in the granulating process of the molten metallurgical slag or a heat source or other heat sources generated in a hot blast stove system, or the granulating air flow for granulating the molten metallurgical slag is formed by mixing air and the hot gas, and the hot gas is hot gas generated by secondary granulation or hot gas generated by cooling the outer wall of the granulator in the granulating process of the molten metallurgical slag or a heat source or other heat sources generated in the hot blast stove system.
The method for recycling the heat energy of the molten metallurgical slag is characterized in that before the small particles enter a granulating particle cooling process or other heat exchange processes, a cooling medium is blown into the small particles to rapidly cool the small particles, hot gas generated by rapidly cooling the small particles is mixed with hot gas generated by a molten slag granulating process and then enters a reheating process or is sent to a user for use, and the cooling medium used for rapidly cooling is the hot gas heated to a certain temperature in other processes or fresh air or a mixture of water and air directly sucked from the atmosphere.
The device for realizing the method for recycling the heat energy of the molten metallurgical slag is characterized in that the device for granulating the molten metallurgical slag at least consists of a granulator shell, a molten metallurgical slag inlet, a granulating airflow blowing-in port, a large particle outlet, a small particle outlet, a hot gas outlet and a particle separation baffle for separating large particles from small particles; the particle separating baffle is arranged in a particle settling area in the flowing direction of the airflow; the large particle outlet is connected with the particle inlet of a secondary granulator for realizing the secondary granulation process, the small particle outlet is connected with the particle inlet side of a granulated particle cooling device for cooling granulated particles, and the hot gas outlet is connected with a heat source user or a reheating process.
The device for realizing the method for recycling the heat energy of the molten metallurgical slag is characterized in that the cooling process of the granulated particles after the molten metallurgical slag is granulated is realized by directly contacting cooling gas with the granulated particles in a moving bed heat exchange tower; the moving bed heat exchange tower at least comprises a moving bed heat exchange tower shell, a high-temperature granulation particle inlet positioned at the upper part of the tower, a particle outlet positioned at the lower part of the tower, a gas outlet positioned at the upper part of the tower and a gas inlet positioned at the lower part of the tower; the moving bed is internally provided with perforated bed plates which are parallel to the horizontal line or have an included angle of less than 15 degrees, the perforated bed plates are provided with particle falling openings, the particle inlet sides and the particle falling opening sides of the perforated bed plates are respectively positioned at two ends of the bed plates, the particle inlet sides are connected with the tower wall of the moving bed heat exchange tower, the perforated bed plates are arranged in a multi-layer mode along the tower height direction, the particle inlet sides and the particle falling opening sides of the adjacent perforated bed plates are alternately arranged on different sides in the heat exchange tower, and metallurgical slag granulation particle flow channels are reserved between the adjacent perforated bed plates.
The device of the method for recycling the heat energy of the molten metallurgical slag is characterized in that the cooling process of the granulated particles after the molten metallurgical slag is granulated is realized by directly contacting cooling gas with the granulated particles in a rotary heat exchanger; the rotary heat exchanger at least comprises a rotary heat exchanger shell, a high-temperature granulation particle inlet positioned at the upper part of the heat exchanger, a particle outlet positioned at the lower part of the heat exchanger, a gas outlet positioned at the upper part of the heat exchanger and a gas inlet positioned at the lower part of the heat exchanger; the particle dispersing mechanism is divided into a cylinder periphery particle dispersing mechanism and a cylinder inner particle dispersing mechanism, or the particle dispersing mechanism is a dispersing plate with different radial lengths arranged on the inner wall of the cylinder.
The method for recycling the heat energy of the molten metallurgical slag is characterized in that the hot gas at any temperature section in the granulating particle cooling process is sent into a granulating airflow preheating process in the molten metallurgical slag granulating process to be used as a heat source or used as a cooling medium in the small particle rapid cooling process, or the hot gas generated by cooling the cooling medium on the outer wall of a granulating device in the molten metallurgical slag granulating process is sent into a corresponding temperature section in the granulating particle cooling process to be continuously heated by the granulated particles.
The method for recycling the heat energy of the molten metallurgical slag is characterized by at least comprising the following steps of:
(1) the heat energy recovery process of the molten metallurgical slag comprises the following steps: a molten metallurgical slag heat energy recovery process for recovering heat energy from molten metallurgical slag to generate high temperature air; feeding combustion-supporting air required by heating of a hot blast stove into a molten metallurgical slag heat energy recovery system to exchange heat with high-temperature metallurgical slag to generate high-temperature air;
(2) the hot air utilization process of the metallurgical furnace of the high-temperature air comprises the following steps: the high-temperature air obtained in the molten metallurgical slag heat energy recovery process is used in the metallurgical furnace hot air utilization process of the high-temperature air utilized by the metallurgical furnace hot air; introducing high-temperature air into a hot blast stove system, mixing the high-temperature air with fuel gas preheated by waste gas of the hot blast stove, and combusting the mixture to provide a heat source for generating hot air which is pressurized and sent to a metallurgical furnace; the whole amount or most of the waste gas of the hot blast stove is used for preheating fuel gas.
The method for recycling the heat energy of the molten metallurgical slag is characterized by at least comprising the following steps of:
(1) the heat energy recovery process of the molten metallurgical slag comprises the following steps: in the process of recovering heat energy from the molten metallurgical slag to generate high-temperature air, a certain amount of air is fed into a molten metallurgical slag heat energy recovery system by taking the high-temperature air with the temperature of over 700 ℃ as a target, and the fed air and the high-temperature metallurgical slag exchange heat to generate the high-temperature air with the temperature of over 700 ℃;
(2) the hot air utilization process of the metallurgical furnace of the high-temperature air comprises the following steps: the high-temperature air obtained in the molten metallurgical slag heat energy recovery process is used in the metallurgical furnace hot air utilization process of the high-temperature air utilized by the metallurgical furnace hot air; the high-temperature air is mixed with the preposed combustion high-temperature air generated by preposed combustion heat exchange, then introduced into the hot blast stove system to be mixed with the fuel gas preheated by the waste gas of the hot blast stove for combustion, and a heat source is provided for generating hot air which is pressurized and sent to the metallurgical furnace.
The method for recycling the heat energy of the molten metallurgical slag is characterized in that the molten metallurgical slag flowing out of a metallurgical furnace is rapidly cooled to generate granulated particles or/and hot air generated by cooling the granulated particles can be used for the following purposes: or preheating for metallurgical blast, specifically arranged between the outlet of the blower for blowing air to the metallurgical furnace and the cold air inlet at the bottom of the hot blast stove or between the outlet of the blower and the cold air inlet at the corresponding temperature section of the hot blast stove, or used as a heat source for power generation or other heat sources.
The concrete description is as follows:
the method for recycling the heat energy of the molten metallurgical slag mainly comprises two processes: the process of recovering heat energy from the molten metallurgical slag to generate high-temperature gas and the process of utilizing the recovered heat energy; the process of generating high-temperature gas by recovering heat energy from the molten metallurgical slag is mainly completed by a granulating device and a granulated particle cooling device.
The molten metallurgical slag at 1400-1600 ℃ flowing out of the metallurgical furnace flows into a molten metallurgical slag inlet of a granulating device, is blown by preheated granulating gas to enter the granulating device, and is divided into two settling areas of large particles and small particles by a set separation baffle plate in the airflow direction. In order to realize that the granulated particles can be rapidly cooled in a short time and ensure the vitreous body structure of metallurgical slag to be used as a cement raw material, air or a mixture of water and air is blown into a small particle aggregation area from the bottom of the small particles to rapidly cool the small particles to below 900 ℃, and then the small particles are sent into a device for cooling the granulated particles to generate heat gas for heat exchange and cooling; in the large particles, since molten slag which is not completely solidified exists in the particles and the cooling speed is slow, the large particles are introduced into a secondary granulator, and air flow or water or a mixture of water and air is blown into the secondary granulator to carry out secondary granulation. In the secondary granulation process, large particles can be completely granulated into small particles in a short time, and the small particles are sent to a granulated particle cooling device for heat exchange cooling after being cooled to the temperature below 900 ℃. The secondary granulation of large particles not only ensures the complete granulation and vitreous body proportion of the molten metallurgical slag, but also realizes the granulation and the vitrifying of the molten metallurgical slag by using a small amount of granulation gas and obtains high-temperature gas. The hot gas generated by secondary granulation or the hot gas generated by cooling the outer wall of the granulation device is used for preheating granulation air flow, so that the inlet temperature of the granulation gas can be increased, the high-temperature gas with the temperature of 600-700 ℃ is generated after the rapid heat exchange with the molten metallurgical slag, and the value of the granulation gas used as combustion air or other heat sources of a hot blast furnace system is improved.
Meanwhile, in order to ensure that the granulation device can operate at high temperature for a long time, a cooling jacket needs to be arranged around the whole granulation device, air or a mixture of water and air is introduced into the granulation device to cool the wall surface continuously, the temperature of the wall surface is ensured to be in a proper range, and hot gas obtained by cooling the granulation device can be used as quick cooling gas for small particles to improve the temperature of the hot gas of the granulation device, can also be used for preheating granulation air flow and can also be used for secondary granulation.
When the air flow disturbance is small, small particles are blown to the far area of the granulation device beyond the separation baffle, and particles with larger particle sizes are carried less by the air and fall into the near area of the granulation device. When the influence of the turbulent air flow is large, large particles with large particle sizes obtain large kinetic energy and are less influenced by the diffusion weakening air flow, and can be blown to a far area of the granulating device beyond the separating baffle, and small particles with small particle sizes are easily influenced by the turbulent air flow due to small kinetic energy and fall into a near area of the granulating device.
And cooling the granulated particles at the high temperature of below 900 ℃ after granulation by a moving bed heat exchange tower or a rotary heat exchanger to generate hot gas. The granulated particles are contacted with gas passing through the perforated bed plate on the perforated bed plate arranged in the moving bed heat exchange tower for heat exchange, fall from a particle falling port of the perforated bed plate to enter a next layer of perforated bed plate, are contacted with the gas for heat exchange, sequentially fall layer by layer for heat exchange, and are discharged from a particle outlet at the bottom of the tower, and the cooled granulated particles are supplied to a cement plant as raw materials for producing cement. And a cooling medium is blown into the tower from the bottom of the tower upwards, passes through the pores of each bed plate and exchanges heat with the granulated metallurgical slag particles, the temperature of the air flow for completing heat exchange reaches 600-800 ℃, and the air flow can be directly used as combustion air of a hot blast furnace system or a preheating heat source or other heat sources. In practical application, hot gas enters the cyclone dust collector to remove large-particle dust in the gas, and the collected dust is mixed with discharged low-temperature granulated particles to be used as raw materials for producing cement.
When the rotary heat exchanger is used for cooling granulated particles, high-temperature granulated particles enter the heat exchanger and rotate downwards in the heat exchanger along with the rotation of the heat exchanger, the high-temperature granulated particles are discharged from a particle outlet at the lower position of the rotary heat exchanger, a cooling medium enters from a gas inlet at the lower position of the heat exchanger and flows in countercurrent contact with the granulated particles for heat exchange, the granulated particles are thrown out under the action of a particle dispersing mechanism arranged in the radial direction of the rotary cylinder and are uniformly dispersed in the heat exchanger, the heat transfer area and the efficiency of hot air are increased, the heat transfer path and the dispersing effect of the granulated particles are increased in the rotating and advancing process, and the heat exchange effect is greatly. The slag particles cooled to about 150 ℃ through heat exchange are discharged from the particle outlet and are supplied to a cement plant to be used as raw materials for producing cement. The temperature of the air flow after heat exchange is finished reaches 600-800 ℃, and the air flow enters a cyclone dust collector to remove large-particle dust in the air and then is sent to a hot air user.
The granulation process and the cooling process of the granulated particles in the method have heat sources with various heat energy grades, and the heat energy utilization effect can be effectively improved through scientific and step utilization in the process of recovering the heat energy. Wherein the heat medium produced in the granulation process respectively comprises high-temperature granulation air flow, outer wall jacket cooling hot air flow, secondary granulation hot air or hot water steam and the like, and the heat medium can be used as a heat source and then returned to the high-temperature metallurgical slag for recycling heat energy. For example, the granulation air flow entering the granulation device needs to be preheated, and the preheating heat source can adopt secondary granulation hot gas or hot water steam, outer wall interlayer cooling hot gas, high-temperature hot gas generated by granulation particle cooling heat exchange or other heat sources. For example, in the rapid cooling process of small particles, the cooling medium blown by the blower is preferably preheated, and the preheating heat source can also adopt outer wall interlayer cooling hot gas, high-temperature hot gas generated by cooling heat exchange of granulated particles or other heat sources. On the other hand, the cooling hot gas of the outer wall interlayer can also be sent to a corresponding temperature section in the granulation particle heat exchanger according to the difference of the finally discharged temperature, and is continuously heated by the granulation particles, so that the final temperature can be effectively increased.
High-temperature hot gas at 600-800 ℃ generated by heat exchange of the granulated particles is used as a heat source, can be used for producing hot air in a smelting hot blast stove, and can also be applied to boilers, power generation or other heat energy applications. Generally speaking, because the hot blast stove is relatively close to a metallurgical slag heat recovery facility and belongs to a common distribution system in the metallurgical industry, hot air is directly used for smelting the hot blast stove, so that the heat energy utilization rate can be improved, and the equipment investment can be saved. The method for utilizing the heat energy generated by electricity generation is more economical under the conditions that the distance from the hot blast stove is far and the power generation facility is close.
The heat energy utilization for providing a heat source for the hot blast stove mainly aims at improving the temperature of hot blast for smelting and saving fuel gas. When air is adopted for cooling the metallurgical slag, hot air generated by granulation and heat exchange can be directly used as combustion-supporting air to enter a hot blast furnace system. The application modes of the high-temperature air generated by the heat exchange of the slag for the hot blast stove are divided into a full-quantity medium-temperature hot air utilization mode and a component high-temperature air-preposed combustion matching utilization mode. The full-quantity medium-temperature hot air utilization mode is that the combustion-supporting air quantity which is equal to or larger than the total combustion-supporting air quantity required by the hot blast stove is used for granulating, heat exchanging and cooling the molten metallurgical slag, the required air quantity is larger, so that the air temperature generated by heat exchanging is at a medium-temperature level, about 300-400 ℃, and the medium-temperature air is dedusted and then directly used as preheated combustion-supporting air to be fed into the hot blast stove. Meanwhile, the gas exchanges heat with low-temperature flue gas at 200-300 ℃ generated by burning of another hot blast stove connected in parallel through a flue gas heat exchanger to be heated, the flue gas is sent into a combustion chamber of the hot blast stove to be burnt with hot air generated by cooling molten metallurgical slag in the combustion chamber, lattice bricks in a regenerator are heated and stored heat, a heat source is provided for heating air sent to a metallurgical furnace, and high-temperature hot air at the temperature of more than 1200 ℃ is obtained and sent to the metallurgical furnace to participate in smelting.
The component high-temperature air-preposed combustion matching utilization mode is to use certain air quantity to carry out granulation and heat exchange cooling on the molten metallurgical slag, so that the temperature of the generated air is above 700 ℃. Meanwhile, a front combustion furnace burns a small amount of fuel gas to preheat the other part of cold air to about 600 ℃, the cold air is mixed with hot air generated by heat exchange of slag, and the hot air enters the furnace from a combustion-supporting air inlet of a hot blast furnace so as to ensure that the air inlet amount reaches the combustion-supporting air amount required by the hot blast furnace; due to the orderly control of the air volume, the temperature of the mixed air is as high as 600-700 ℃, and the high-temperature air is used as preheating combustion-supporting air and blown into the hot blast stove. Meanwhile, the gas exchanges heat with low-temperature flue gas at 200-300 ℃ generated by burning of another hot blast stove connected in parallel through a flue gas heat exchanger to be heated, the flue gas is sent into a combustion chamber of the hot blast stove to be burnt with hot air generated by cooling molten metallurgical slag in the combustion chamber, lattice bricks in a regenerator are heated and stored heat, a heat source is provided for heating air sent to a metallurgical furnace, and high-temperature hot air at the temperature of more than 1200 ℃ is obtained and sent to the metallurgical furnace to participate in smelting.
When other media are adopted for cooling the high-temperature metallurgical slag, such as water or air flow added with water and the like, the generated hot gas can indirectly exchange heat with combustion-supporting air to increase the temperature of the combustion-supporting air, and then the hot gas and the fuel gas preheated by the low-temperature flue gas are combusted in a combustion chamber, so that the final metallurgical blast temperature can be effectively increased.
The hot gases generated in the process of granulating the molten metallurgical slag and the process of heat exchange and cooling of the granulated particles can also be used for preheating metallurgical blast air. The high-temperature hot gas generated by heat exchange with the slag can heat metallurgical blast in an indirect contact or heat storage heat exchange mode. The metallurgical blast air can be heated to 200-500 ℃ and discharged, and the hot gas is cooled to 150-200 ℃ and discharged or used for other waste heat utilization. The preheated metallurgical blast enters the hot blast furnace in an air supply mode, can directly enter from a cold air inlet at the bottom of the hot blast furnace, can also be introduced from a corresponding temperature section of the hot blast furnace, exchanges heat with high-temperature checker bricks of a heat storage chamber of the hot blast furnace to generate high-temperature air with the temperature of over 1200 ℃, and is sent to the metallurgical furnace to participate in smelting.
High-temperature air generated by heat exchange of the metallurgical slag can also be directly sent to a boiler part of a power generation system to participate in heat energy supply of a power system, and can also be used as a heat source of other application technologies such as a boiler and the like.
The medium for granulation of the molten metallurgical slag and cooling of the granulated particles may employ air, or a mixture of water and air. In the case of air cooling and application to hot blast stoves, the water addition may be adjusted to the moisture requirements of the blast air in the iron making season when atmospheric humidity is low, and may be optimized for the granulation process if used for power generation.
The method and the device have the advantages that the method and the device for cooling and granulating the molten metallurgical slag quickly and efficiently, exchanging heat for the granulated particles to recover heat, generating high-temperature gas for improving the air temperature of the hot blast stove and saving fuel or serving as other heat sources for power generation and the like are provided, the vitreous body structure of the metallurgical slag is ensured, and a foundation is laid for the subsequent utilization of the metallurgical slag particles. By granulating the particles in different areas, the secondary granulation of large particles realizes the full and stable granulation of a small amount of air, thereby not only ensuring the vitreous body rate of the metallurgical slag, but also generating high-temperature hot air, and improving the grade of heat energy to lay a foundation for the subsequent recycling of the metallurgical slag and the subsequent utilization of the heat energy; the heat energy grade of the generated high-temperature hot air is improved by preheating the granulated air flow, and a foundation is laid for subsequent heat energy utilization; the heat energy of the metallurgical slag is efficiently, fully and cheaply recovered through the alternate perforated plate moving bed; the heat energy of the metallurgical hot blast stove for recovering hot gas in a full-quantity medium-temperature hot air mode and a component high-temperature air-preposed combustion matching mode is utilized, so that the utilization efficiency and the value of the heat energy are greatly improved; by the recovery of high-temperature hot gas with high efficiency and low cost of the molten metallurgical slag and the high-efficiency utilization of heat energy of the metallurgical furnace, the material recycling and the high-value utilization of heat energy of the molten metallurgical slag are realized, and an effective technical means is provided for the metallurgical industry for energy conservation, emission reduction, consumption reduction and efficiency improvement. The method and the device have the characteristics of simple equipment, convenient operation, low investment and operation cost, stable operation and the like.
Drawings
FIG. 1: granulation and moving bed heat exchange devices and flow charts;
FIG. 2: a flow chart for utilizing full-quantity medium-temperature air;
FIG. 3: a flow chart of component high-temperature air-pre-combustion matching utilization;
FIG. 4: granulation and rotary heat exchange devices and flow charts;
FIG. 5: a heat exchange medium preheating metallurgical blast flow chart.
Wherein, 1-a granulating device; 2-a remote settling area of the granulation chamber; 3-a settling area near the granulation chamber; 4-a secondary granulator; 5-a separation baffle; 6-secondary granulator particle inlet; 7-perforating the bed plate; 8-large particle outlet; 9-small particle outlet; 10-granulation hot gas outlet; 11-a granulation air stream preheater; 12-molten metallurgical slag; 13-a granulation air stream spray inlet; 14-secondary granulation hot gas outlet; 15-small particle rapid cooling medium; 16-secondary granulation of the cooling medium; 17-a granulation air stream; 18-secondary granulation hot gas; 19-granulation of hot gases; 20-large granulated particles; 21-small particle granulated particles; 22-mixing high temperature granulated particles; 23-a moving bed heat exchange column; 24-high temperature granulation granule inlet; 25-heat exchange hot gas outlet; 26-a low-temperature metallurgical slag outlet; 27-heat exchange perforated bed plate; 28-particle drop opening; 29-cooling gas; 30-heat exchange hot gas; 31-low temperature metallurgical slag; 32-hot blast stove; 33-a combustion chamber; 34-a regenerator; 35-gas heat exchanger; 36-combustion air of a hot blast stove; 37-gas; 38-low temperature flue gas; 39-air for smelting; 40-hot air for smelting; 41-a front-mounted combustion furnace; 42-high temperature flue gas; 43-pre-combustion preheating air; 44-high temperature flue gas heat exchanger; 45-metallurgical blast heat exchanger; 46-rotary heat exchanger; 47-a heat exchange gas outlet; 48-rotation type heat exchanger rotation; 49-cylindrical peripheral particle dispersing means; 50-particle dispersing mechanism inside the cylinder.
Detailed Description
Example 1:
the present embodiment is a scheme for recycling heat energy of molten iron-making slag, and includes two processes: the high-temperature air generated by the granulation of the molten metallurgical slag and the heat exchange and cooling of the moving bed and the utilization mode of the full amount of medium-temperature hot air are used for the hot blast furnace system. As shown in FIG. 1, the 1500 ℃ molten metallurgical slag 12 flows into the granulating apparatus 1 through the inlet port, and is blown off by the granulating gas flow 17 injected from the granulating gas flow injection port 13 to be deposited in a parabolic manner. Because the airflow disturbance is small, the small granular granulated particles 21 are blown to a remote settlement area 2 beyond the separating baffle 5, and a small granular rapid cooling medium 15 is blown from the bottom, so that the small granular granulated particles 21 are rapidly cooled to be below 900 ℃, and fall to a small granular outlet 9 along the perforated bed plate 7 to be discharged; the small-particle rapid cooling medium 15 is hot air generated by heat exchange heating between a jacket (not shown in the figure) on the outer wall of the granulation device 1 and a high-temperature wall surface, and the generated rapid cooling hot gas is mixed with hot gas generated in the granulation process and then is discharged from the granulation hot gas outlet 10. Large granulated particles 20 generated by blowing of the granulated airflow do not cross the separation baffle 5, settle to a near settling area 3, enter a secondary granulator 4 through a particle inlet 6 of the secondary granulator, contact with a secondary granulation cooling medium 16 for secondary granulation, and are discharged from a large particle outlet 8 after being cooled to below 900 ℃; air is used as a secondary granulation cooling medium 16, and the generated secondary granulation hot gas 18 is discharged from a secondary granulation hot gas outlet 14 and is sent to a granulation gas flow preheater 11 as a preheating heat source of granulation gas flow 17 to preheat the granulation gas flow. By the aid of the granulated particles in different regions, secondary granulation of large particles is realized, a small amount of cooling medium is used for fully and stably granulating the metallurgical slag particles, a vitreous body structure is guaranteed, and the use amount of granulated airflow is greatly reduced. The large granulated particles 20 and the small granulated particles 21 are mixed to form mixed high-temperature granulated particles 22, and the mixed high-temperature granulated particles are sent to a moving bed heat exchange tower 23 for heat exchange and cooling.
The granulation air flow 17 in the granulation process is preheated by the granulation air flow preheater 11 and then sent into the granulation device 1, the temperature of the final granulation hot gas 19 is effectively increased to 400-500 ℃, and the granulation hot gas enters a combustion air supply system of a hot blast stove 32 for use.
The mixed high-temperature granulated particles 22 enter a moving bed heat exchange tower 23 through a high-temperature granulated particle inlet 24, are subjected to heat exchange with cooling gas 29 blown from the bottom on a heat exchange perforated bed plate 27 (forming an included angle of 10 degrees with the horizontal line), are cooled and move, are discharged from a particle falling port 28, enter a lower-layer heat exchange perforated bed plate, are subjected to heat exchange and cooling in sequence, and low-temperature metallurgical slag 31 cooled to about 150 ℃ is discharged from a low-temperature metallurgical slag outlet 26 at the bottom of the tower and is used as a raw material for producing cement in a cement plant. The particle inlet sides of the heat exchange perforated bed plates are connected with the tower wall of the moving bed heat exchange tower 23, the particle inlet sides of the adjacent heat exchange perforated bed plates 27 and the particle falling openings 28 are alternately arranged on different sides in the tower, and the mixed granulated particles flow downwards in sequence, so that the heat exchange time and efficiency are greatly increased, the temperature of heat exchange hot gas 30 can reach 600-800 ℃, the heat exchange hot gas is discharged from the heat exchange hot gas guide outlet 25 and enters a combustion air supply system of a hot blast stove 32 for use.
As shown in fig. 2, the granulation hot gas 19 generated by the granulation device 1 and the heat exchange hot gas 30 generated by the moving bed heat exchange tower 23 are mixed to form hot-blast stove combustion air 36 with the temperature of about 500-600 ℃, and the hot-blast stove combustion air is directly introduced into a combustion air inlet of the hot-blast stove 32; the gas 37 exchanges heat with low-temperature flue gas 38 at 200-300 ℃ generated by burning of another hot blast stove alternately connected in parallel through the gas heat exchanger 35, is preheated to about 250 ℃, is introduced into a gas inlet of the hot blast stove 32 to be mixed with combustion air 36 of the hot blast stove, is burned in the combustion chamber 33 to heat and accumulate checker bricks of the regenerator 34, and the low-temperature flue gas 38 is discharged for preheating the gas 37 of the hot blast stove connected in parallel. After the heat storage process is finished, smelting air 39 enters the regenerator 34 in the furnace from the cold air inlet to finish heat exchange with the checker bricks, and smelting hot air 40 with the temperature of over 1200 ℃ is discharged from the hot air outlet and is sent to the metallurgical furnace to participate in smelting.
The hot air generated by heat recovery of the smelting iron slag directly serves as combustion-supporting air to enter the hot blast stove system, so that the preheating temperature of the combustion-supporting air is obviously improved, the heat conversion link is simple, and the heat loss is low. Meanwhile, by adopting the scheme of directly supporting combustion by the granulated heat exchange air and preheating fuel gas by the flue gas, the waste heat of the slag and the waste heat of the hot blast stove can be effectively utilized simultaneously, the waste heat of the slag can be effectively superposed into a hot blast system, the maximization of energy distribution and utilization is realized, the material recycling of the molten metallurgical slag and the high-value utilization of heat energy are realized, and the method has the advantages of simple equipment, convenience in operation, low investment and operation cost and stability in operation.
Example 2:
the present embodiment is a scheme for recycling heat energy of molten steel-making slag, comprising two processes: the melting metallurgical slag granulation and rotary heat exchange cooling high-temperature air production part and the component high-temperature air-front combustion matching utilization mode are used for the hot blast furnace system part. As shown in FIG. 4, the 1500 ℃ molten metallurgical slag 12 flows into the granulating apparatus 1 through the inlet port, and is blown off by the granulating gas flow 17 injected from the granulating gas flow injection port 6 to be deposited in a parabolic manner. Because the influence of turbulent air flow is large, large granulated particles 20 are blown to a remote settlement area 2 beyond a separation baffle 5, enter a secondary granulator 4, contact with a secondary granulation cooling medium 16 for secondary granulation, and are discharged from a large particle outlet 8 after being cooled to below 900 ℃; the water is used as the secondary granulation cooling medium 16, and the generated secondary granulation hot gas 18 is discharged from the secondary granulation hot gas outlet 14. Small granulated particles 21 generated by blowing of the granulated airflow 17 do not cross the separation baffle 5 and settle to a near settling area 3, a small particle rapid cooling medium 15 is blown from the bottom to promote the small granulated particles 21 to be rapidly cooled to below 900 ℃, and the small granulated particles fall to a small particle outlet 9 along the perforated bed plate 7 to be discharged; the small particle rapid cooling medium 15 is a mixture of water and air. The large granulated particles 20 and the small granulated particles 21 are mixed to form mixed high-temperature granulated particles 22, and the mixed high-temperature granulated particles are sent to a rotary heat exchanger 47 for heat exchange and cooling.
The granulation air flow 17 in the granulation process is preheated by the granulation air flow preheater 11 and then sent into the granulation device 1, the temperature of the final granulation hot gas 19 is effectively increased to 700-800 ℃, the temperature of the final granulation hot gas enters a combustion air supply system of a hot blast stove 32, and a preheating heat source adopts mixed gas of hot air generated by heat exchange with a high-temperature wall surface in an outer wall jacket and high-temperature steam generated by secondary granulation.
The mixed high-temperature granulated particles 22 are introduced from the high-temperature granulated particle inlet 24 of the rotary heat exchanger 47, and are thrown and dispersed inside the rotary heat exchanger 47 under the action of the heat exchanger rotation 48, the peripheral particle dispersing mechanism 49 of the cylinder and the inner particle dispersing mechanism 50 of the cylinder, and are in countercurrent contact with the cooling gas 29 introduced from the lower position for heat exchange. The low-temperature metallurgical slag 31 cooled to about 150 ℃ is discharged from a low-temperature metallurgical slag outlet 26 and is used as a raw material for producing cement in a cement plant. The particle dispersing mechanisms are arranged in the radial direction of the cylinder at equal intervals, and the particle dispersing mechanism on the periphery of the cylinder and the particle dispersing mechanism in the cylinder greatly increase the particle dispersing degree, the heat exchange area and the effect. The temperature of the heat exchange hot gas 30 can reach 700-800 ℃, and the heat exchange hot gas is discharged from the heat exchange gas outlet 48 and enters a combustion air supply system of the hot blast stove 32.
As shown in fig. 3, the temperature of the generated granulation hot gas 19 and the heat exchange hot gas 30 is maintained above 700 ℃ by controlling the flow rate of the granulation system gas. Meanwhile, high-temperature flue gas 42 at about 1000 ℃ generated by the combustion of the front-end combustion furnace 41 exchanges heat with normal-temperature air through a high-temperature flue gas heat exchanger 44 to generate front-end combustion preheating air 43 at about 700 ℃, and the front-end combustion preheating air is introduced into a combustion air supply system of the hot blast stove 32 to supplement the insufficient air quantity of the hot blast stove combustion air 36 required by the hot blast stove 32.
The pre-combustion preheating air 43, the granulation hot gas 19 and the heat exchange hot gas 30 are mixed into hot blast stove combustion air 36 with the temperature of above 700 ℃, and the hot blast stove combustion air 36 is directly introduced into a combustion air inlet of the hot blast stove 32; the gas 37 exchanges heat with low-temperature flue gas 38 at 200-300 ℃ generated by burning of another parallel hot blast stove through the gas heat exchanger 35, is preheated to about 250 ℃, is introduced into a gas inlet of the hot blast stove 32 to be mixed with combustion air 36 of the hot blast stove, is burned in the combustion chamber 33 to heat and accumulate checker bricks of the regenerator 34, and the low-temperature flue gas 38 is discharged for preheating the gas 37 of the parallel hot blast stove. After heat accumulation is finished, smelting air 39 enters a regenerator 34 in the furnace from a cold air inlet to finish heat exchange with the checker bricks, and smelting hot air 40 with the temperature of over 1200 ℃ is discharged from a hot air outlet and is sent into a metallurgical furnace to participate in smelting.
The hot air generated by heat recovery of the smelting iron slag is mixed with the pre-combustion preheating air and directly used as combustion-supporting air to enter the hot blast stove system, so that the high-grade waste heat of the slag is fully utilized, the preheating temperature of the combustion-supporting air is obviously improved, the heat conversion link is simple, and the heat loss is less. Meanwhile, by adopting the scheme of mixing the granulated heat exchange air and the pre-preheating air for combustion supporting and preheating the fuel gas by the flue gas, the waste heat of the furnace slag and the waste heat of the hot blast stove can be effectively utilized simultaneously, the waste heat of the furnace slag can be effectively superposed into a hot blast system, the maximization of energy distribution and utilization is realized, the material recycling of the molten metallurgical slag and the high-value utilization of heat energy are realized, and the method has the characteristics of simple equipment, convenience in operation, low investment and operation cost, stable operation and the like.
Example 3
This example is a heat recovery scheme for molten metallurgical slag of nonferrous metallurgy, the molten metallurgical slag granulation and heat recovery section is the same as example 1, except that high temperature air is used to preheat the hot blast to be forced to the smelting furnace, as shown in fig. 5. The air for smelting 39 is heated by the mixed gas flow of the granulated hot gas 19 and the heat exchange hot gas 30 through a metallurgical blast heat exchanger 45, the temperature is raised to about 400-500 ℃, the air is introduced into a cold air inlet of a hot blast stove 32 to complete further heat exchange with checker bricks of a regenerator 34, and the hot air for smelting 40 with the temperature of more than 1200 ℃ is discharged from a hot air outlet and is sent into a metallurgical furnace to participate in smelting.
The hot air generated by the heat recovery of the smelting iron slag is directly used for preheating metallurgical blast so as to effectively utilize the waste heat of the slag, the final hot air temperature can be obviously improved by matching with the preheating of combustion air and fuel gas, the maximization of energy distribution and utilization is realized, and the material recycling and high-value utilization of heat energy of the smelting iron slag are realized.
Example 4
The part of this example that recovers heat energy from the molten metallurgical slag is substantially the same as example 1, and the recovered heat energy utilization is applied to the hot blast furnace system part (as shown in fig. 3) using a partial high temperature air-pre combustion matched utilization, as in example 2. In addition, in the granulation process, the preheating heat source of the granulation air flow 17 adopts low-temperature flue gas discharged by a hot blast stove system. Air is used as a secondary granulation cooling medium 16 to carry out secondary granulation on the large particles; the small-particle rapid cooling medium 15 is hot air generated by heat exchange heating between a jacket (not shown in the figure) on the outer wall of the granulation device 1 and a high-temperature wall surface, and the generated rapid cooling hot gas is mixed with hot gas generated in the granulation process and then is discharged from the granulation hot gas outlet 10. After preheating of the granulating air flow 17 and heat absorption and temperature rise of the small-particle rapid cooling medium 15, the temperature of the finally generated mixed gas of the granulating air flow and the small-particle rapid cooling medium can reach 700-800 ℃.
Example 5
This example is essentially the same as example 1, except that the granulation air stream 17 is formed by mixing air with the hot secondary granulation gas 18 and the hot air generated by heat exchange with the outer wall jacket during granulation. The flow of the granulated gas is large, the cooling effect on small particles of the metallurgical slag is large, and the small particles can be cooled to be below 900 ℃, so that the rapid cooling process of the small particles is omitted. After hot air in the interlayer of the outer wall of the granulating device 1 is discharged, the hot air is sent to a corresponding air temperature section in the moving bed heat exchange tower 23 according to the temperature of the hot air, participates in heat exchange, and is continuously heated by the mixed metallurgical slag 22. The air for smelting 39 is heated by the mixed gas flow of the granulated hot gas 19 and the heat exchange hot gas 30 through a metallurgical blast heat exchanger 45, then is heated to about 400-500 ℃, and is introduced into a cold air inlet of a corresponding temperature section of the furnace body of the hot blast furnace 32 to complete further heat exchange with the checker bricks of the regenerator 34. This reduces the amount of preheated smelting air 39 to increase the preheating temperature, while the required amount of smelting air is replenished from the cold air inlet at the bottom of the hot blast stove 32. The hot air 40 for smelting with the temperature of more than 1200 ℃ is discharged from the hot air outlet and is sent into a metallurgical furnace to participate in smelting. The cooling medium 3 adopted by the secondary granulation is a multi-medium into which water and air are respectively sprayed.
Example 6
This example is essentially the same as example 2, except that the granulation air stream 17 is formed by mixing air with a portion of the hot air produced by the stove, and the small particle rapid cooling medium 15 is air. In addition, the particle dispersing mechanism of the rotary heat exchanger adopted in the granulating particle heat exchange process is a dispersing plate with different radial lengths and lengths which is equidistantly arranged on the inner wall of the cylinder, and the mixed high-temperature granulating particles 22 are uniformly scattered in the inner space of the cylinder under the rotation action of the cylinder, so that the gas-solid contact and heat exchange are effectively promoted.
Example 7
This example is substantially the same as example 1 except that the granulation air stream 17 is a mixture of water and air, the resulting granulation hot gas 19 and heat exchange hot gas 30 are fed to a power generation system to generate power as a source of heat energy for the power generation system, and the amount of water added is determined according to the optimization of the granulation process. The cooling medium 3 used for the secondary granulation is water. The granulation air stream is not preheated.
Example 8
This example is essentially the same as example 1, except that the cooling medium 3 used for the secondary granulation is a mixture of water and air which is fed directly into the granulation hot gas 19, without preheating the granulation gas stream. The granulation hot gas 19 and the heat exchange hot gas 30 generated by the granulation device 1 are used as heat sources for drying materials to participate in the drying operation of other materials.
Claims (3)
1. A method for recycling heat energy of molten metallurgical slag is characterized in that the process of recycling the heat energy of the molten metallurgical slag at least comprises a process of recycling the heat energy of the molten metallurgical slag to generate high-temperature gas and a process of utilizing the heat energy; the molten metallurgical slag heat energy recovery process at least comprises a molten metallurgical slag granulation process for rapidly cooling molten metallurgical slag flowing out of a metallurgical furnace to generate granulated metallurgical slag particles and a granulated particle cooling process for further cooling the granulated metallurgical slag particles obtained in the metallurgical slag granulation process; in the process of granulating the molten metallurgical slag, the molten metallurgical slag is blown away by granulating airflow to form granulated metallurgical slag particles, and the granulated metallurgical slag particles are divided into large particle areas and small particle areas in the flying-out direction of the particles, fall and are respectively collected; the small particles directly enter a granulating particle cooling process or other heat exchange processes, the large particles enter a secondary granulating process, and the secondary granulating process is realized by adopting a mode that water or a mixture of water and air directly contacts with the large particles.
2. The method according to claim 1, wherein the granulation gas stream is preheated prior to being blown off the molten metallurgical slag, the preheating being carried out in an indirect manner, and the source of heat for preheating the granulation gas stream is hot gas generated by the secondary granulation or hot gas generated by cooling the outer wall of the granulator during the granulation of the molten metallurgical slag or a heat source generated in a hot blast stove system or other heat sources.
3. An apparatus for realizing the method for recycling heat energy of molten metallurgical slag according to claim 1, wherein the apparatus for the granulation of molten metallurgical slag comprises at least a granulator shell, a molten metallurgical slag inlet, a granulating air flow inlet, a large particle outlet, a small particle outlet, a hot gas outlet and a particle separating baffle for separating the large and small particles; the particle separating baffle is arranged in a particle settling area in the flowing direction of the airflow; the large particle outlet is connected with the particle inlet of a secondary granulator for realizing the secondary granulation process, the small particle outlet is connected with the particle inlet side of a granulated particle cooling device for cooling granulated particles, and the hot gas outlet is connected with a heat source user or a reheating process.
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| CN110819746A (en) * | 2019-09-25 | 2020-02-21 | 内蒙古科技大学 | Method and device for recycling heat energy of molten metallurgical slag |
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| CN202279828U (en) * | 2011-10-14 | 2012-06-20 | 无锡市东方环境工程设计研究所有限公司 | Anti-adhesion type granulating heat-transfer cabin |
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