CN111607671A - Steel slag sensible heat recovery system and use method thereof - Google Patents
Steel slag sensible heat recovery system and use method thereof Download PDFInfo
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- CN111607671A CN111607671A CN202010442153.7A CN202010442153A CN111607671A CN 111607671 A CN111607671 A CN 111607671A CN 202010442153 A CN202010442153 A CN 202010442153A CN 111607671 A CN111607671 A CN 111607671A
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- 239000002893 slag Substances 0.000 title claims abstract description 239
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000011084 recovery Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 123
- 239000000428 dust Substances 0.000 claims abstract description 22
- 238000005469 granulation Methods 0.000 claims abstract description 15
- 230000003179 granulation Effects 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 44
- 238000002347 injection Methods 0.000 claims description 38
- 239000007924 injection Substances 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
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- 238000007789 sealing Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
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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
-
- 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
Abstract
The invention relates to the field of steel production, in particular to a steel slag sensible heat recovery system and a using method thereof, wherein the steel slag sensible heat recovery system comprises a slag granulation system and a heat recovery system; the slag granulation system comprises a granulator and an air cooling chamber; the granulator is communicated with the air cooling chamber; the air cooling chamber is also connected with a fan set used for supplying air to the air cooling chamber; the heat recovery system comprises a heat exchange device arranged at the upper end of the air cooling chamber; the heat exchange device is connected with a generator for generating electricity; and the air outlet of the heat exchange device is communicated with the fan unit. The invention discloses a novel steel slag sensible heat recovery system, which can realize the recycling of cooling air and reduce the overflow of dust by arranging all parts of a slag granulating system and a heat recovery system.
Description
Technical Field
The invention relates to the field of steel production, in particular to a steel slag sensible heat recovery system and a use method thereof.
Background
The high-temperature molten steel slag contains considerable heat energy, and the heat release of the converter slag from 1450 ℃ to 300 ℃ is 1500MJ/t slag calculated, which is converted into standard coal 51.25kg/t slag. At present, the annual steel slag production amount in China is more than 1.hundred million tons, and the annual recoverable heat is more than 260 million tons of standard coal according to the recovery rate of 50%.
Since the 70 s of the last century, the research and the test of the sensible heat recovery of the steel slag are carried out abroad, but the steel slag is still in the test stage so far and has not been applied industrially. The research in this aspect in China is just started, only a few units have carried out preliminary tests, and the research is far away from industrial application.
From the relevant test results at home and abroad, the difficulty of recovering the sensible heat of the steel slag is mainly that the sensible heat recovery of the steel slag must be combined with the treatment of the molten steel slag, and the treatment of the steel slag is still a worldwide problem.
The steel slag treatment methods are many, but after production practice tests, most of the steel slag treatment methods are eliminated, only a few steel slag treatment methods are applied in production, at present, the most applied steel slag treatment in China is a plurality of waste heat hot-stuffy processes, and the steam recovery is only designed in a vertical tank stuffy process among the plurality of waste heat hot-stuffy processes. Due to the limitation of the hot stuffy process and the pot type equipment, the steam pressure of the vertical pot stuffy recovery is low, the quality is poor, the heat recovery rate is also low, and the popularization value is not high.
In order to prevent the fusion and hardening of slag droplets, the conventional molten steel slag dry granulation production line adopts measures such as large field, low speed, atomized water and the like, but the heat cannot be recovered.
Therefore, in order to solve the above technical problems, a new steel slag sensible heat recovery system and a new steel slag sensible heat recovery method are needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a novel steel slag sensible heat recovery system.
In order to achieve the purpose, the invention adopts the technical scheme that:
a steel slag sensible heat recovery system comprises a slag granulation system and a heat recovery system; the slag granulation system comprises a granulator and an air cooling chamber; the granulator is communicated with the air cooling chamber; the air cooling chamber is also connected with a fan set used for supplying air to the air cooling chamber; the heat recovery system comprises a heat exchange device arranged at the upper end of the air cooling chamber; the heat exchange device is connected with a generator for generating electricity; and the air outlet of the heat exchange device is communicated with the fan unit.
The air outlet of the heat exchange device is connected with the fan unit through the processing mechanism; the processing mechanism comprises a cyclone dust collector; the cyclone dust collector is connected with a cooling chamber through a pipeline; a sewage sedimentation tank is arranged at an outlet at the lower end of the cooling chamber; and the side outlet of the cooling chamber is connected with a fan unit.
The fan set is connected with the air cooling chamber through an air path pipe.
The granulation system further comprises an intermediate slag pot for limiting the speed of molten slag entering the granulator.
The air cooling chamber comprises a chamber body; a slag discharge outlet is formed in the side surface of the chamber body; the slag discharging outlet is connected with a sliding door for sealing the slag discharging outlet; the lower end of the chamber body is connected with an air spraying group used for air cooling of the steel slag sprayed into the chamber body.
The chamber body includes a floor; a side plate is arranged on the periphery of the bottom plate; the bottom plate and the side plates form a box body structure with an opening at the upper part; the air injection group comprises a main air injection group used for injecting air to the air cooling chamber; the main air jet group is arranged on the bottom plate.
The main air injection group comprises a main nozzle which is communicated with the air path pipe through a main air pipeline; the main nozzle is arranged by protruding the upper end surface of the bottom plate.
And a cooling pipeline for cooling the bottom plate is arranged in the bottom plate.
The air injection group also comprises a front air injection group and a rear air injection group; the front air injection group and the rear air injection group are arranged on a side plate of the chamber body; the front air injection group and the rear air injection group are distributed on two sides of the main air injection group; the front spray group is arranged close to the slag granulation system.
A use method of a steel slag sensible heat recovery system comprises the following steps:
(1) the slag reaches a treatment station;
(2) starting a cooling fan to confirm that the air spraying of the air spraying group of the air cooling chamber is normal;
(3) opening the granulator; tilting the slag pot to pour the slag into the intermediate slag pot; the high-speed airflow sprayed out by the granulator breaks the molten slag liquid into fine liquid drops; fine slag droplets move forward along with the gas flow; cold air sprayed from the lower part pushes slag liquid drops to the upper part and carries out heat exchange; the cold air and the high-temperature slag liquid drops are subjected to heat exchange to form hot air, and the hot air rises to enter a heat exchange device; and continuing the process;
(4) when the set time limit and the set temperature are reached and the step (3) is finished, the slag granulation is finished; continuously spraying cooling air for 5-10 minutes; then reducing the rotating speed of the fan; opening the side wall of the air cooling chamber; starting a slag tapping conveying system; the loader enters the air cooling chamber to push the slag particles into the chamber body; the loader pushes the slag particles in the air cooling chamber to a conveying system; the conveying system conveys the granulated slag into a high-level storage bin for storage for later use;
(5) and (3) finishing one-time steel slag sensible heat recovery, and repeating the steps (1) to (4) if the subsequent steel slag needs to be treated.
The invention has the advantages that:
the invention discloses a novel steel slag sensible heat recovery system, which has a basic sensible heat recovery function, and can realize the recycling of cooling air and reduce the overflow of dust through the arrangement of parts of a slag granulating system and a heat recovery system; in addition, by optimizing the spray grouping setting mode and matching the front spray grouping, the main spray grouping and the rear spray grouping, the slag can be cooled better, meanwhile, the staying time of slag liquid drops in the air is prolonged, and the cooling effect of the slag is optimized.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a process flow diagram of a slag granulation system according to the present invention.
FIG. 2 is a process flow diagram of the heat recovery system of the present invention.
Fig. 3 is an overall layout view in the present invention.
FIG. 4 is a cross-sectional view of an air-cooled chamber of the present invention.
FIG. 5 is a side view of an air-cooled chamber of the present invention.
The labels in the above figures are:
the system comprises a slag granulation system, an air cooling chamber, a heat exchange device, a dust settling chamber, a dust bin, a cyclone dust collector, a cooling chamber, a sewage sedimentation tank, a fan unit and a main air pipe, wherein the air cooling chamber is 2, the heat exchange device is 3, the dust settling chamber is 5, the dust bin is 6, the cooling chamber is 7, the sewage sedimentation tank is 8, the fan unit is 9, and the main air pipe is 10.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The invention discloses a steel slag sensible heat recovery system, which comprises a slag grain 1-2 chemical system 1 and a heat recovery system; the slag granule 1-2 formation system 1 comprises a granulator and an air cooling chamber 2; the granulator is communicated with the air cooling chamber 2; the air cooling chamber 2 is also connected with a fan set 9 for supplying air to the air cooling chamber 2; the heat recovery system comprises a heat exchange device 3 arranged at the upper end of the air cooling chamber 2; the heat exchange device 3 is connected with a generator for generating electricity; the air cooling chamber 2 mainly has the function of sealing the chamber, and provides a place for slag cooling treatment; the subsequent matching with the fan set 9, the air supply is carried out inside the air cooling chamber 2 through the fan set 9, the slag sprayed into the air cooling chamber 2 is cooled, the cooling gas sprayed by the fan and the slag are subjected to heat exchange, the hot air enters the heat exchange device 3, the heat exchange device 3 is subjected to treatment, the heat in the hot air entering the heat exchange device 3 can be utilized, and the operation such as power generation can be carried out; since the heat exchange device 3 belongs to the prior art, the detailed structure of the heat exchange device 3 will not be described herein and will be understood; the invention can realize the recycling of the heat of the molten slag through the arrangement of the structure; of course, in addition to the disclosure of the above, the present invention also discloses that the air outlet of the heat exchange device 3 is communicated with the fan set 9; the arrangement is such that the gas exhausted from the heat exchange device 3 can also enter the air cooling chamber 2 again through the fan set 9 for cooling, so that the exchange of the system and the external air can be reduced, and the dust pollution caused by the gas exhaust and the damage of the external polluted air to the products or components in the system can be reduced.
Preferably, in the invention, the air outlet of the heat exchange device 3 is connected with the fan set 9 through the processing mechanism; the processing mechanism comprises a cyclone dust collector 6; the cyclone dust collector 6 is connected with a cooling chamber 7 through a pipeline; a sewage sedimentation tank 8 is arranged at an outlet at the lower end of the cooling chamber 7; a fan set 9 is connected to an outlet on the side surface of the cooling chamber 7; the invention can purify the gas sprayed out of the heat exchange device 3 by matching the cyclone dust collector 6, the temperature reduction chamber 7 and the sewage sedimentation tank 8, thereby facilitating the recycling of the gas.
Preferably, the fan set 9 is connected with the air cooling chamber 2 through an air pipeline pipe 10; the arrangement of the air path pipe 10 facilitates the arrangement between the fan unit 9 and the air cooling chamber 2, and also facilitates the arrangement of the subsequent air spraying unit, the air path pipe 10 serves as a main air duct, and the connection of each branch pipeline is sealed.
Preferably, the granulation system of the present invention further comprises an intermediate slag tank 1-1 for limiting the speed of molten slag entering the granulator; the intermediate slag tank 1-1 is adopted to limit the slag feeding speed, so that the instantaneous slag feeding speed of the granulator is prevented from exceeding the cooling capacity of the system.
Preferably, the air-cooling chamber 2 of the present invention includes a chamber body; a slag discharge outlet 251 is formed in the side surface of the chamber body; the invention discloses an air cooling chamber 2 which adopts side deslagging, and is matched with a loader for use, wherein the loader pushes steel slag cooled in the air cooling chamber 2 out of the chamber body through a side deslagging outlet 251, and meanwhile, a conveying system is arranged outside the air cooling chamber 2, wherein the conveying system mainly comprises a scale conveyor, after slag particles 1-2 are pushed out of the chamber body, the slag particles fall onto the scale conveyor, and the scale conveyor continuously moves to convey the slag particles 1-2 to a set position for later use, and in addition, the deslagging outlet 251 is connected with a sliding door 252 for sealing the deslagging outlet 251; the sliding door 252 can be opened by a hydraulic cylinder as an automobile tail door, or by other methods, mainly the sliding door 252 can be opened to facilitate subsequent slag removal; meanwhile, in order to ensure the cooling of the slag, the lower end of the chamber body is connected with an air spraying group for air cooling of the steel slag sprayed into the chamber body; the air spraying set is connected with a fan set 9; the air injection group is a nozzle structure, is connected with the main air pipe and is mainly used for air inlet operation; as a further refinement, the chamber body of the present invention includes a bottom plate 24; a side plate 25 is arranged on the periphery of the bottom plate 24; the bottom plate 24 and the side plate 25 form a box body structure with an opening at the upper part; in addition, in order to ensure the above-mentioned slag discharge requirement, the length of the bottom plate 24 is greater than the length of the side plates 25, that is, the width of the box structure enclosed by the side plates 25 is smaller than the width of the bottom plate 24, which is more clearly expressed as follows: the outer side surfaces of the side plates 25 and the outer side surface of the bottom plate 24 are positioned on two planes, and a certain interval is formed between the side plates 25 and the edges of the bottom plate 24; the purpose of such setting is that can set up the slag hole at bottom plate 24 edge, make things convenient for the outer row of slag particle 1-2, the apron conveyer sets up in the below of slag hole simultaneously, is favorable to guaranteeing the outer row of slag particle 1-2.
In addition, as an optimization, the air-jet group in the present invention includes a main air-jet group 21 for blowing air to the air-cooling chamber 2; the main air injection group 21 is arranged on the bottom plate 24; the main air jet group 21 is arranged on the bottom plate 24, and the main air jet group 21 mainly plays a cooling role and also plays a role in increasing the time for the slag liquid to drop on the bottom plate 24; in addition, in order to ensure the accuracy of the wind direction, the main air jet group 21 is arranged perpendicular to the bottom plate 24, in other words, the main nozzle is arranged perpendicular to the bottom plate 24, so that the slag particles 1-2 can be better cooled, the slag can be better blown, and the slag dripping time is prolonged.
Preferably, in the present invention, the main blowing group 21 includes a main nozzle, and the main nozzle is communicated with the air duct 10 through a main air duct; the main nozzle is arranged by protruding the upper end face of the bottom plate 24; the main nozzle is arranged by protruding the upper end face of the bottom plate 24, so that slag particles 1-2 dropping on the bottom plate 24 are prevented from entering the main nozzle, and the subsequent maintenance cost is reduced; as a larger optimization, an arc-shaped plate is arranged at the edge of the main nozzle, one end of the arc-shaped plate is connected with the main nozzle, the other end of the arc-shaped plate is connected with the bottom plate 24, the arc-shaped plate plays a transition role to facilitate separation of the slag particles 1-2, and simultaneously plays a good isolation role to isolate the slag particles 1-2 on the bottom plate 24 from the main nozzle, so that the risk that the slag particles 1-2 enter the main nozzle is reduced.
Preferably, in the present invention, a cooling duct 241 for cooling the bottom plate 24 is provided inside the bottom plate 24; a cooling duct 241 is provided to perform a cooling operation on the base plate 24; so as to prevent small part of slag liquid drops with larger size from being hardened on the bottom plate 24 and prevent the bottom plate 24 from being deformed due to heating.
Preferably, the air injection groups further comprise a front air injection group 22 and a rear air injection group 23; the front air jet group 22 and the rear air jet group 23 are arranged on a side plate 25 of the chamber body; the front air injection group 22 and the rear air injection group 23 are distributed on two sides of the main air injection group 21; the front spraying group is arranged close to the slag particle 1-2 formation system 1; the front air-jet group 22 and the rear air-jet group 23 both comprise nozzles, and the nozzles in the front air-jet group and the thick air-jet group are communicated with the main air pipe 10 through a branch air pipe 10-1; the arrangement of the front air injection group 22 and the rear air injection group 23 can better cool the molten slag, and meanwhile, the arrangement of the front air injection group 22 and the rear air injection group 23 can also play a role in shaping the molten slag, because the front air injection group 22 and the rear air injection group 23 apply an inclination force to the molten slag, the stability of the position of the molten slag can be ensured, the time of the molten slag above the main air injection group 21 is ensured, and the actual cooling effect can be better ensured.
A use method of a steel slag sensible heat recovery system comprises the following steps:
(1) the slag reaches a treatment station;
(2) starting a cooling fan to confirm that the air spraying group of the air cooling chamber 2 sprays air normally;
(3) opening the granulator; tilting the slag pot to pour the slag into the intermediate slag pot 1-1; the high-speed airflow sprayed out by the granulator breaks the molten slag liquid into fine liquid drops; fine slag droplets move forward along with the gas flow; cold air sprayed from the lower part pushes slag liquid drops to the upper part and carries out heat exchange; the cold air and the high-temperature slag liquid drops are subjected to heat exchange to form hot air, and the hot air rises to enter the heat exchange device 3; and continuing the process;
(4) when the set time limit and the set temperature are reached and the step (3) is finished, the melting of the slag particles 1-2 is finished; continuously spraying cooling air for 5-10 minutes; then reducing the rotating speed of the fan; opening the side wall of the air cooling chamber 2; starting a slag tapping conveying system; the loader enters an air cooling chamber 2 to push the slag particles 1-2 into the chamber body; the loader pushes the slag particles 1-2 in the air cooling chamber 2 to a conveying system; the conveying system conveys the granulated slag into a high-level storage bin for storage for later use;
(5) and (3) finishing one-time steel slag sensible heat recovery, and repeating the steps (1) to (4) if the subsequent steel slag needs to be treated.
The above is a preliminary description of the present invention, and the contents of the present invention are described in detail below with reference to the accompanying drawings; the method comprises the following specific steps:
because the thermal conductivity coefficient of the molten steel slag is small, the molten slag must be dispersed and granulated to realize the efficient recovery of the sensible heat of the molten slag.
The novel molten steel slag sensible heat recovery system comprises a molten slag particle 1-2 system 1 and a heat recovery system; when the system is specifically arranged, a heat exchange device 3 in the heat recovery system is directly connected with a slag particle 1-2 system 1, and other components are connected with the slag particle 1-2 system 1 through pipelines or pipelines as much as possible; the arrangement facilitates the arrangement of the components and is also beneficial to the reutilization of gas.
In order to make the description of the invention more clear, the following is included:
the system 1 for forming slag granules 1-2 and the heat recovery system of the present invention will be described below.
Slag granule 1-2 formation system 1
The slag granule 1-2 chemical system 1 of the invention is mainly composed of a slag atomization system, an air cooling chamber 2, a fan unit 9, an air jet unit and the like; as illustrated in the accompanying drawings.
The external support of the air cooling chamber 2 adopts a frame structure, steel or reinforced concrete can be used, and the inner wall is made of fire-resistant plates, heat-insulating cotton and steel, so that the inner wall has the functions of high temperature resistance, heat insulation and sound insulation.
The inner walls of two ends of the air cooling chamber 2 are fixed structures, and the inner walls of the other two sides are movable walls, so that the machine can conveniently enter the air cooling chamber 2 for deslagging and cleaning.
In other words, the end of the side plate 25 disclosed above is fixed, and the two sides of the edge are movable.
According to the field space condition, the movable wall adopts a lifting mode or a hanging side-pushing mode, and other modes such as the modes disclosed above can be selected;
the bottom plate 24 in the air cooling chamber 2 adopts a water cooling structure, and the above is realized by arranging a cooling pipeline 241 in the bottom plate 24; the purpose of this setting is that prevent that the slag liquid drop that small part of yardstick is bigger from hardening on bottom plate 24, prevent that bottom plate 24 from heating and taking place the deformation.
A slag outlet is arranged on the bottom plate 24 at the outer side of the air cooling chamber 2, and a apron conveyer is arranged below the slag outlet and used for receiving slag.
After the slag particles 1-2 are melted each time, continuously blowing cold air into the air cooling chamber 2 for 5 minutes, and by adopting the operation mode, the risk that the slag particles 1-2 enter the main nozzle can be reduced or avoided;
after blowing cold air for 5 minutes, reducing the cold air quantity; when necessary, the fan can be closed, the side wall plates on the two sides of the air cooling chamber 2 are opened, the loader enters the air cooling chamber 2, the granular slag falling on the floor is pushed to a slag hole on the outer side of the air cooling chamber 2, the granular slag falls on the apron conveyor through the slag hole, and then the granular slag is conveyed into the storage bin through the DS conveyor in a relay manner.
In addition, three air jet groups, i.e., the above-indicated main air jet group 21, front air jet group 22, and rear air jet group 23, are provided in the air-cooled chamber 2;
when the slag particles are 1-2 transformed, cold air is sprayed upwards through the air spraying group; the function of the sprayed cold air is to prolong the residence time of the slag particles 1-2 in the air and enhance the cooling of the slag particles 1-2, so that the slag droplets can be solidified into the slag particles 1-2 in the air, and the slag droplets are prevented from being fused and hardened together after falling to the ground; the front air jet group 22, the main air jet group 21 and the rear air jet group 23 are arranged for optimizing the cooling direction of the air jet group to the slag particles 1-2 and optimizing the cooling effect, and meanwhile, the slag can stay in the air for a long time through cooling air in different directions, so that the cooling effect on the slag is ensured.
Preferably, in the invention, the height of the nozzles in the main air injection group 21 is higher than the surface of the bottom plate 24 by more than 100 mm, so that the slag particles 1-2 can be reduced from falling into the underground main air pipe from the nozzles; of course, the main air duct of the invention is preferably provided with cleaning holes for cleaning, which are used for cleaning the main air duct.
The main technical parameters of the slag granule 1-2 formation system 1 are as follows:
melting rate of slag particles 1-2: 2.5 to 3.5 tons/min;
the included angle between the ejection direction of the granulating airflow of the granulator and the horizontal plane is 45-60 degrees (upward); namely, the movement track of the slag sprayed into the air cooling chamber 2 is parabolic;
the air cooling chamber 2 cools the air volume; 3000-4500 Nm3Per minute;
wherein: the air volume of the middle main air injection group 21 is 40-50% of the total air volume, and the ejection direction is vertical to the ground.
The air quantity of the front and rear air jet groups 23 at the two ends is 25-30% respectively, and the included angle between the air jet direction and the horizontal plane is 60-75 degrees.
The production process of the molten steel slag dry granulation comprises the following steps:
the slag arrives at a treatment station → a cooling fan is started, the three air-jet groups of the air-cooling chamber 2 are confirmed to jet air normally → a granulator is opened → a slag tilting tank is tilted to pour the slag into an intermediate slag tank 1-1 → the high-speed air flow sprayed by the granulator breaks the slag liquid into fine liquid drops → the fine slag liquid drops move forward along with the air flow → cold air sprayed from the lower part pushes the slag liquid drops upwards for heat exchange (the fine liquid drops fall slowly due to the upward cold air, the residence time in the air is prolonged, the slag liquid drops are cooled and solidified favorably) → the slag particles 1-2 fall on a bottom plate 24 → the cold air and the high-temperature slag liquid drops are subjected to heat exchange to form hot air, the hot air rises to enter a heat exchange device 3 → the slag particles 1-2 are completely dissolved → the cooling air is continuously sprayed for 5-10 minutes → the rotating speed of the fan is reduced → the side wall of the air-cooling chamber 2 is opened → a slag-discharging conveying system is started → a loader enters the.
The general structure and the embodiment of the system 1 for melting slag particles 1-2 have been described above, and the heat recovery system is described below;
the steel slag sensible heat recovery system comprises:
mainly comprises a heat exchange device 3 (a waste heat boiler), a steam storage tank, a permeable generator and the like.
The heat exchange device 3 is arranged above the air cooling chamber 2 and the dust settling chamber 5, and other steam storage tanks, generators and the like are arranged nearby according to field conditions and are not required to be arranged beside the slag particle 1-2 chemical conversion system 1 facility.
When molten steel slag is granulated in a dry mode, the sensible heat of the steel slag is sprayed into the air cooling chamber 2 to heat cold air into hot air, when the hot air passes through the heat exchange device 3, the heat is taken away and utilized by the heat recovery system, and the hot air circulation flow is as follows:
the blower unit 9 → the main duct → the air jet unit → the air-cooling chamber 2 → the heat exchanging device 3 → the dust settling chamber 5 (dust with a large particle size in the hot air falls into the dust bin 5) → the cyclone dust collector 6 (further reducing the dust in the hot air) → the temperature reducing chamber 7 → the return blower to pressurize.
The product recovered by the heat exchange device 3 is medium-temperature medium-pressure steam, the product is generally used for driving a turbine power generation system, the power generation system can also use a conventional power generation structure, the conventional power generation structure belongs to the known technology, and details are not repeated here, and the steam drives a generator to generate power, so that electric energy is recycled.
The heat exchange device 3 and the turbine power generation system are purchased externally and adopt mature products which are applied more on the market.
The steel slag sensible heat recovery system has the main technical parameters that:
the temperature of the incoming molten slag is 1450 ℃ below zero, and the temperature of the falling slag particles is 1-2 ℃ to 350 ℃.
The temperature of the hot air is 350 ℃. The cold air temperature is less than 150 ℃.
The sensible heat recovery benefit of the steel slag is as follows:
according to the calculation of 30% of heat recovery efficiency, the recovery amount of medium-temperature and medium-pressure steam is 0.135 ton/ton slag, the power generation amount is 38 kwh/ton slag, and the power generation yield is 22.8 yuan/ton slag.
In conclusion, the invention can not only change the structure of the traditional sensible heat recovery system, but also has specific technical effects;
firstly, a plurality of technical measures are adopted, so that molten slag liquid drops can be solidified before falling to the ground, and the problem that the dry granulation of the molten steel slag is prevented from realizing the industrial continuous production is solved.
1) The included angle between the ejection direction of the granulating airflow and the horizontal plane is 45-60 degrees, so that the rising height of the molten slag droplets is increased, and the retention time of the molten slag droplets in the air is prolonged.
2) Three air spraying groups are arranged at the bottom of the air cooling chamber 2, and the air quantity of each air spraying group is designed according to the distribution of the slag falling quantity. The function of the air jet group is to blow the drops which begin to fall upwards, and further prolong the residence time of the slag drops in the air.
3) And cold air is sprayed upwards to accelerate the cooling of the slag particles 1-2, and simultaneously, the cold air separates the gathered slag particles 1-2, so that all the slag particles 1-2 can be cooled.
4) The intermediate slag pot 1-1 is adopted to limit the slag feeding speed, so that the instantaneous slag feeding speed is prevented from exceeding the cooling capacity of the system.
Secondly, in order to prevent the slag from falling to the ground and fusing and hardening to influence the production, the technical measures adopted are as follows:
1) the bottom plate 24 of the air cooling chamber 2 adopts the water cooling bottom plate 24 to prevent the slag particles 1-2 from being adhered to the bottom plate 24, reduce the cleaning time to recover the production and ensure that the 1-2 melting facility of the slag particles is matched with the steel-making production requirement.
2) The slag discharging conveyor is arranged outside the air cooling chamber 2, so that the operation of the conveyor is prevented from being influenced by high temperature.
3) The surface of the air spraying unit is processed by using an integral steel plate, the surface is required to be flat and smooth, the inner wall is prevented from being hung with slag or being slagging, and meanwhile, mechanical equipment is favorably used for cleaning.
4) No equipment is arranged in the air cooling chamber 2, so that the interference and influence of other facilities on the 1-2 chemical production of the slag particles are prevented.
5) The inner wall of the movable chamber is adopted, so that slag removing machinery can rapidly enter the air cooling chamber 2 for removing slag, the rapid recovery operation of the slag particle 1-2 system 1 can be ensured, and the steel-making production is not influenced.
Thirdly, heat recovery is carried out on the basis of realizing high value-added utilization of the steel slag.
1) The heat exchange device 3 is arranged to be separated from a slag droplet flight area, and the slag dry granulation system is firstly ensured to realize industrial continuous production. The high value-added utilization of the steel slag is realized through the dry granulation of the molten steel slag.
2) And the heat recovery device is configured according to the hot air quantity generated by slag dry granulation so as to ensure that the heat recovery system is economical and feasible.
3) The heat exchange device 3 is arranged at the upper part of the air cooling chamber 2, so that the occupied area is reduced.
4) The cold air is recycled without being discharged outside, and the dust overflow is reduced.
5) A spraying air temperature reducing facility is arranged to cool the cold air so as to protect the fan and meet the requirement of cooling the slag particles 1-2.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. The steel slag sensible heat recovery system is characterized by comprising a slag granulation system and a heat recovery system; the slag granulation system comprises a granulator and an air cooling chamber; the granulator is communicated with the air cooling chamber; the air cooling chamber is also connected with a fan set used for supplying air to the air cooling chamber; the heat recovery system comprises a heat exchange device arranged at the upper end of the air cooling chamber; the heat exchange device is connected with a generator for generating electricity; and the air outlet of the heat exchange device is communicated with the fan unit.
2. The steel slag sensible heat recovery system of claim 1, wherein an air outlet of the heat exchange device is connected with a fan unit through a processing mechanism; the processing mechanism comprises a cyclone dust collector; the cyclone dust collector is connected with a cooling chamber through a pipeline; a sewage sedimentation tank is arranged at an outlet at the lower end of the cooling chamber; and the side outlet of the cooling chamber is connected with a fan unit.
3. The steel slag sensible heat recovery system as claimed in claim 2, wherein the fan unit is connected with the air cooling chamber through an air passage pipe.
4. The steel slag sensible heat recovery system of claim 1, wherein the granulation system further comprises an intermediate slag tank for limiting a speed of molten slag entering the granulator.
5. The steel slag sensible heat recovery system of claim 1, wherein said air-cooled chamber comprises a chamber body; a slag discharge outlet is formed in the side surface of the chamber body; the slag discharging outlet is connected with a sliding door for sealing the slag discharging outlet; the lower end of the chamber body is connected with an air spraying group used for air cooling of the steel slag sprayed into the chamber body.
6. A steel slag sensible heat recovery system according to any one of claims 1 to 5 wherein said chamber body includes a floor; a side plate is arranged on the periphery of the bottom plate; the bottom plate and the side plates form a box body structure with an opening at the upper part; the air injection group comprises a main air injection group used for injecting air to the air cooling chamber; the main air jet group is arranged on the bottom plate.
7. The steel slag sensible heat recovery system of claim 6, wherein the main jet air group comprises a main nozzle, and the main nozzle is communicated with the air path pipe through a main air pipeline; the main nozzle is arranged by protruding the upper end surface of the bottom plate.
8. The steel slag sensible heat recovery system of claim 6, wherein a cooling pipeline for cooling the bottom plate is arranged inside the bottom plate.
9. The steel slag sensible heat recovery system according to claim 6, wherein said air injection groups further comprise a front air injection group and a rear air injection group; the front air injection group and the rear air injection group are arranged on a side plate of the chamber body; the front air injection group and the rear air injection group are distributed on two sides of the main air injection group; the front spray group is arranged close to the slag granulation system.
10. The use method of the steel slag sensible heat recovery system according to any one of claims 1 to 9, wherein the use method comprises the following steps:
(1) the slag reaches a treatment station;
(2) starting a cooling fan to confirm that the air spraying of the air spraying group of the air cooling chamber is normal;
(3) opening the granulator; tilting the slag pot to pour the slag into the intermediate slag pot; the high-speed airflow sprayed out by the granulator breaks the molten slag liquid into fine liquid drops; fine slag droplets move forward along with the gas flow; cold air sprayed from the lower part pushes slag liquid drops to the upper part and carries out heat exchange; the cold air and the high-temperature slag liquid drops are subjected to heat exchange to form hot air, and the hot air rises to enter a heat exchange device; and continuing the process;
(4) when the set time limit and the set temperature are reached and the step (3) is finished, the slag granulation is finished; continuously spraying cooling air for 5-10 minutes; then reducing the rotating speed of the fan; opening the side wall of the air cooling chamber; starting a slag tapping conveying system; the loader enters the air cooling chamber to push the slag particles into the chamber body; the loader pushes the slag particles in the air cooling chamber to a conveying system; the conveying system conveys the granulated slag into a high-level storage bin for storage for later use;
(5) and (3) finishing one-time steel slag sensible heat recovery, and repeating the steps (1) to (4) if the subsequent steel slag needs to be treated.
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| CN113532119A (en) * | 2021-07-21 | 2021-10-22 | 福建省三明同晟化工有限公司 | Molten water glass grading heat recovery device and recovery method |
| CN114854912A (en) * | 2022-04-29 | 2022-08-05 | 安徽马钢嘉华新型建材有限公司 | Slag multi-mode cooling system |
| TWI797001B (en) * | 2021-06-28 | 2023-03-21 | 日商杰富意鋼鐵股份有限公司 | Heat supply estimation method, heat supply estimation device, heat supply estimation program, and blast furnace operation method |
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