CN107816898B - Slag heat exchange device and high-temperature waste heat recovery device comprising same - Google Patents
Slag heat exchange device and high-temperature waste heat recovery device comprising same Download PDFInfo
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- CN107816898B CN107816898B CN201711165857.9A CN201711165857A CN107816898B CN 107816898 B CN107816898 B CN 107816898B CN 201711165857 A CN201711165857 A CN 201711165857A CN 107816898 B CN107816898 B CN 107816898B
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- 239000002893 slag Substances 0.000 title claims abstract description 310
- 239000002918 waste heat Substances 0.000 title claims abstract description 42
- 238000011084 recovery Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 98
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims description 33
- 238000007664 blowing Methods 0.000 claims description 22
- 238000009423 ventilation Methods 0.000 claims description 19
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 16
- 238000005338 heat storage Methods 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 20
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
Abstract
The application belongs to the field of energy conservation, and particularly relates to a smelting slag heat exchange device and a high-temperature waste heat recovery device comprising the same; the slag heat exchange device comprises a slag heat exchange mechanism for conveying and distributing slag, the slag heat exchange mechanism comprises a first-stage heat exchange material bed which is obliquely arranged, the feeding end is high, the discharging end is low, and the bottom of the first-stage heat exchange material bed is provided with a vent hole which can be introduced with cooling air flow to blow and float the slag and move towards the discharging end. According to the slag heat exchange device, cooling air flows can blow slag to float and move to the lower-level material bed through the vent holes at the bottom of the material bed, slag particles are collected, distributed, heat-exchanged and recollected for many times, conveying, heat-transferring and heat-exchanging of the slag particles are realized, meanwhile, low-pressure cooling air can perform step-by-step and uniform heat exchange, the purpose of recovering waste heat of slag is achieved, and the utilization efficiency of waste heat of slag is high.
Description
[ Field of technology ]
The application belongs to the field of energy conservation, and particularly relates to a smelting slag heat exchange device and a high-temperature waste heat recovery device comprising the same.
[ Background Art ]
In the current industrial field, smelting furnace equipment generates a large amount of slag in the production process, and the slag is often accompanied by a large amount of waste heat, and technical data show that the part of waste heat resources account for more than 30% of the fuel consumption of the part of waste heat resources, so that great potential exists for waste heat utilization of the slag. The utilization of the residual heat of the slag can reduce the energy consumption of unit products and reduce the environmental pollution, so that the utilization of the residual heat of the slag has considerable economic and social benefits. The existing device for recycling the waste heat of the slag is low in utilization efficiency, particularly low in utilization efficiency of the waste heat of the low-heat-value slag, the domestic smelting slag basically adopts a water quenching mode, a large amount of heat carried in the slag is wasted, and the environment is directly polluted.
In view of the above-mentioned problems, the present inventors have made reasonable improvements, and the technical solutions to be described below are based on this premise.
[ Invention ]
The application provides a slag heat exchange device and a high-temperature waste heat recovery device comprising the same, aiming at solving the problems of low waste heat efficiency and serious heat loss of slag in the slag granulating device in the prior art, and the slag waste heat utilization efficiency is high, so that the slag heat exchange device is particularly suitable for recycling low-heat-value industrial slag waste heat.
The application adopts the technical scheme for solving the technical problems:
the slag heat exchange device comprises a slag heat exchange mechanism for conveying and distributing slag, wherein the slag heat exchange mechanism comprises a first-stage heat exchange material bed which is obliquely arranged, the feeding end of the first-stage heat exchange material bed is high, the discharging end of the first-stage heat exchange material bed is low, and a vent hole which can be introduced with cooling air flow to blow and float the slag and move towards the discharging end is formed in the bottom of the first-stage heat exchange material bed.
The slag heat exchange device comprises the first-stage heat exchange material bed, wherein the first slag guide plates are arranged in a cascade manner and are downwards stacked in sequence, gaps are arranged between the adjacent first slag guide plates, the gaps form the ventilation holes, and projections of adjacent ends of the adjacent first slag guide plates in the vertical direction are overlapped.
The slag heat exchange mechanism further comprises a second-stage heat exchange material bed arranged below the first-stage heat exchange material bed, the upper end of the second-stage heat exchange material bed is arranged at the lower end of the first-stage heat exchange material bed, the second-stage heat exchange material bed comprises a plurality of second slag guide plates which are arranged in a step-shaped and downward lamination mode in sequence, gaps are formed between adjacent second slag guide plates, and projections of adjacent ends of the adjacent second slag guide plates in the vertical direction overlap.
The slag heat exchange device is characterized in that the feeding end of the first-stage heat exchange material bed is provided with a blanking bin communicated with the feeding end of the first-stage heat exchange material bed for conveying slag to the feeding end of the first-stage heat exchange material bed, and the discharging end of the second-stage heat exchange material bed is provided with a receiving bin communicated with the feeding end of the second-stage heat exchange material bed for collecting slag.
The slag heat exchange device comprises the cooling air pipe arranged at the bottom of the second-stage heat exchange material bed, the cooling air pipe is provided with a nozzle capable of blowing cooling air flow into the bottom of the second slag guide plate, the ventilation pipe is arranged on the upper portion of the ventilation pipe in a penetrating manner, a first-stage slag blowing pipe communicated with the ventilation pipe is arranged on the upper portion of the ventilation pipe, a nozzle inserted into the lower end of the blanking bin is arranged on the first-stage slag blowing pipe, a second-stage slag blowing pipe is arranged above the cooling air pipe, and a nozzle inserted into the second-stage heat exchange material bed is arranged on the second-stage slag blowing pipe.
The slag heat exchange device comprises a slag heat exchange device body, wherein a plurality of air distribution plates are arranged above a first-stage heat exchange material bed at intervals, one end of each air distribution plate is arranged towards the middle air flow of a blanking bin in a guiding mode, the other end of each air distribution plate extends downwards towards one side of the first-stage heat exchange material bed, gaps for air to pass through are formed between the adjacent air distribution plates, the first-stage heat exchange material bed and a second-stage heat exchange material bed form a conical structure with an opening gradually expanding towards the inner end, and the conical structure is provided with two conical structures which are symmetrically arranged.
The slag heat exchange device further comprises a flow distribution cavity, wherein an air hole and a heat storage structure are arranged in the flow distribution cavity, the air hole is communicated with the flow distribution cavity, the heat storage structure is communicated with the air hole through the flow distribution cavity, cooling air flow blown out by the air supply device is led to the flow distribution cavity through the air hole, and radiant heat absorbed by the heat storage structure is recovered and carried with heat to enter the main flue opening.
The high-temperature waste heat recovery device comprises a closed shell, wherein a slag collecting chamber for collecting slag is arranged in the closed shell, and the slag heat exchange device is arranged in the slag collecting chamber.
The high-temperature waste heat recovery device is characterized in that the closed shell is provided with the feeding port communicated with the slag collecting chamber, the high-temperature waste heat recovery device further comprises a slag air quenching granulating device which is arranged on one side of the closed shell and blows slag into the slag collecting chamber through the feeding port by utilizing high-pressure air flow, the slag air quenching granulating device comprises a slag granulating chamber, a slag blanking port communicated with the slag granulating chamber is arranged in the slag granulating chamber, a slag granulating cavity communicated with the slag blanking port and used for granulating slag by utilizing air flow is arranged below the slag blanking port, and a slag air quenching granulating mechanism communicated with the slag granulating cavity is arranged on one side of the slag granulating cavity.
The high-temperature waste heat recovery device comprises the main nozzle arranged below the rear side of the blanking end of the slag blanking port, two auxiliary nozzles symmetrically arranged relative to the main nozzle, and the central extension lines of the two auxiliary nozzles and the central extension line of the main nozzle are intersected at a point and are positioned on the central extension line of the slag blanking port.
Compared with the prior art, the application has the following advantages:
1. According to the slag heat exchange device, cooling air flows can blow slag to float and move to the lower-level material bed through the vent holes at the bottom of the material bed, slag particles are collected, distributed, heat-exchanged and recollected for many times, so that conveying, heat transfer and heat exchange of the slag particles are realized, meanwhile, low-pressure cooling air can be subjected to step-by-step and uniform heat exchange, the purpose of recovering waste heat of slag is achieved, and the utilization efficiency of waste heat of slag is high;
2. The first-stage heat exchange material bed is high in feeding end and low in discharging end, the material bed is composed of a plurality of first slag guide plates which are sequentially and downwards stacked in a step shape, gaps are arranged between adjacent first slag guide plates, projections of adjacent ends of the adjacent first slag guide plates in the vertical direction are overlapped, the falling of slag to the lower-stage material bed is facilitated, the slag is prevented from directly entering the next-stage heat exchange material bed without heat exchange, cooling air flows blow and float the slag on the first slag guide plates to form a floating bed and downwards move to form a moving bed, and the moving speed and thickness of the slag can be controlled through the adjustment of air quantity and air pressure, so that the slag waste heat recovery efficiency is improved;
3. The cooling air pipe is arranged at the bottom of the outer end of the second-stage heat exchange material bed, the cooling air pipe is provided with a nozzle capable of blowing cooling air flow into the bottom of the second slag guide plate, ventilation pipes are further arranged on the material collecting bin and the material blanking bin in a penetrating mode, a first-stage slag blowing pipe communicated with the ventilation pipes is arranged on the ventilation pipes, the nozzle inserted into the lower end of the material blanking bin is arranged on the first-stage slag blowing pipe, the second-stage slag blowing pipe is arranged above the cooling air pipe, the nozzle inserted into the second-stage heat exchange material bed is arranged on the second-stage slag blowing pipe, cooling air blown out by the nozzle of the cooling air pipe can enter from the bottom of the second slag guide plate, and hot air generated by slag on the second slag guide plate after being treated by the cooling air enters into the air distribution plate area from the bottom of the first slag guide plate.
4. The air distribution plate is arranged above the heat exchange material bed, when the slag enters the slag collecting chamber, the falling slag is blown to the slag collecting chamber through the air distribution plate and the air, the air flow rate in the gap of the air distribution plate is high, the leakage of the slag is avoided, and the use is not influenced even if the leakage is small;
5. The two conical structures are symmetrically arranged about the ventilation pipe, the conical structure on the left side can be used for collecting slag with large particles, the conical structure on the right side can be used for collecting slag with small particles, the granulated slag is spread in a slag collecting chamber in a fan shape, the particle sizes, the densities and the speeds of the particles are different, but the drop point basically drops in a generally fixed area in the length direction from large to small according to the particle sizes, the left side particles are larger, the right side particles are smaller, and the particles are distributed in heat exchange material beds at the left end and the right end through blanking bins;
6. According to the slag air quenching granulating device, high-temperature molten slag is blown into the slag collecting chamber through the feeding port by utilizing high-pressure air flow, and the multi-stage heat exchange mechanism in the slag collecting chamber can carry out conveying distribution on the blown slag and perform multi-stage heat exchange on the blown slag at the same time, so that the waste heat recovery utilization rate is improved;
7. The main nozzle of the slag air quenching granulating mechanism is arranged at the rear side below the slag blanking port, and is mainly used for controlling the air quantity and the air speed of primary air to ensure that the grain size of granulated slag meets the production requirement of the next step; the two auxiliary nozzles are arranged at the lower end of the main nozzle and are symmetrically arranged relative to the main nozzle, the central extension lines of the two auxiliary nozzles and the central extension line of the main nozzle are intersected at one point and the point is positioned on the central extension line of the slag blanking port, the main purpose is to enable the dropping point of the granulated slag to meet the requirement of a waste heat recovery device by controlling the air quantity and the air speed of the secondary air, meanwhile, the two auxiliary nozzles can partially offset the blown secondary air quantity relatively, the central axis of the auxiliary nozzle and the central axis of the main nozzle form an included angle, the included angle is proper, and the granulated slag can be prevented from being blown to the slag granulating cavity wall by the secondary air blown when the set angle is overlarge;
8. The application discloses a split flow cavity, which is provided with an air hole and a heat storage structure which are communicated with the air hole, wherein the heat storage structure is used for absorbing radiant heat during slag granulation, the heat storage structure is communicated with the air hole through the split flow cavity, and the radiant heat absorbed by the heat storage structure is recovered and carried into a main flue mouth by virtue of the fact that the specific gravity of the radiant heat is higher during slag granulation as the temperature of molten slag is above 1400 ℃.
[ Description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a high temperature waste heat recovery device of the present application;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is a schematic view of the flow diversion chamber of the present application;
FIG. 4 is a schematic structural view of a slag wind-quenching granulating apparatus of the present application;
FIG. 5 is a schematic structural view of a slag wind-quenching granulating mechanism of the application.
[ Detailed description ] of the invention
The application will be further described with reference to the accompanying drawings and specific examples.
As shown in fig. 1 to 5, a high-temperature waste heat recovery device comprises a closed shell 1, wherein a slag collecting chamber for collecting slag is arranged in the closed shell, a feed port 11 communicated with the slag collecting chamber is arranged on the closed shell, the high-temperature waste heat recovery device further comprises a slag air quenching granulating device which is arranged on one side of the closed shell and blows slag into the slag collecting chamber through the feed port by utilizing compressed air flow, the slag air quenching granulating device comprises a slag granulating chamber 20, a slag blanking port 21 communicated with the slag granulating chamber is arranged in the slag granulating chamber, a slag granulating cavity 23 communicated with the slag granulating port by utilizing air flow is arranged below the slag blanking port 21, a slag air quenching granulating mechanism 22 communicated with the slag granulating chamber is arranged on one side of the slag granulating cavity, the high-temperature waste heat recovery device further comprises a slag heat exchanging device arranged in the slag collecting chamber, the slag heat exchanging device comprises a slag heat exchanging mechanism 3 for conveying and distributing slag, the slag exchanging mechanism comprises a first-stage heat exchanging material bed 31 which is obliquely arranged and has a high feed end and a low discharge end, and the bottom of the first-stage heat exchanging material bed is provided with a vent hole which can blow slag and move towards the discharge end by introducing cooling air flow.
The high-temperature waste heat recovery device of the embodiment utilizes compressed air flow to granulate high-temperature molten slag, the compressed air flow is blown into a slag collection chamber through a granulating chamber, a slag heat exchange device in the slag collection chamber can convey and distribute the blown slag and simultaneously conduct multistage heat exchange on the blown slag, cooling air flow can blow and float the slag through a vent hole at the bottom of a material bed and move the slag to a lower-level material bed, the slag particles are subjected to repeated collection, distribution, heat exchange and re-collection, distribution, conveying, heat transfer and heat exchange of the slag particles are achieved, meanwhile, low-pressure cooling air can conduct gradual and uniform heat exchange, the purpose of slag waste heat recovery is achieved, and the slag waste heat recovery and utilization efficiency is high.
The slag heat exchange mechanism comprises a blanking bin 33, a first-stage heat exchange material bed 31, a second-stage heat exchange material bed 32 and a receiving bin 34 which are sequentially connected from top to bottom, wherein the blanking bin is used for conveying slag, and the first-stage heat exchange material bed 31 is communicated with the blanking bin 33 and used for bearing slag. Specifically, the first-stage heat exchange material bed 31 includes a plurality of first slag guide plates 311 which are stacked downward in a step-like manner, gaps are provided between adjacent first slag guide plates, the gaps form the ventilation holes, and projections of adjacent ends of the adjacent first slag guide plates in the vertical direction overlap; the second-stage heat exchange material bed 32 comprises a plurality of second slag guide plates 321 which are arranged in a cascade manner and are downwards stacked in sequence, gaps are arranged between adjacent second slag guide plates, projections of adjacent ends of the adjacent second slag guide plates in the vertical direction are overlapped, and a receiving bin is used for collecting slag. The slag cooling device has the advantages that the slag is beneficial to sliding down the lower-stage material bed, meanwhile, the slag is prevented from directly entering the lower-stage heat exchange material bed without heat exchange, cooling air flows through gaps between adjacent first slag guide plates to blow and float the slag on the first slag guide plates to form a floating bed and move downwards to form a moving bed, and the moving speed and thickness of the slag can be controlled through the adjustment of air quantity and air pressure, so that the efficiency of slag waste heat recovery is improved. Of course, the first-stage heat exchange material bed in this embodiment is not limited to the above structure, for example, in a specific implementation, the heat exchange material bed may be a heat exchange material plate that is obliquely arranged in a whole, the ventilation holes are a plurality of heat exchange holes that are uniformly distributed at intervals and are arranged on the heat exchange material plate, and the heat exchange holes are obliquely arranged and the oblique direction of the heat exchange holes is opposite to the arrangement direction of the heat exchange material plate.
The first-stage heat exchange material bed 31 and the second-stage heat exchange material bed 32 form a conical structure with an opening gradually expanding towards the inner end, two conical structures are arranged, and the two conical structures are symmetrically arranged. In this embodiment, the toper structure is equipped with two, and sets up about the ventilation pipe symmetry, and the toper structure on left side can be used to collect the slag of big granule, and the toper structure on right side can be used to collect the slag of granule, and the slag after the granulation is fan-shaped and spreads in the slag collection room, and granule particle diameter, density, speed are different, but the drop point falls in approximately fixed region in the length direction according to the particle diameter from big to small basically, and left side granule is great, and right side granule is less, distributes in the heat transfer material bed at both ends about through blanking storehouse. Slag in the blanking bin enters a heat exchange material bed through distribution, the bottom of the material bed is high-temperature-resistant high-strength refractory material, two ends of the material bed are fixed on a wall to form a step-shaped slag guide plate, cooling air passes through the bottom of the second slag guide plate to exchange heat with slag, the slag enters a next-stage collecting bin through multistage heat exchange, movement and re-heat exchange, and the movement speed and thickness of the slag are controlled through adjustment of cooling air quantity and air pressure, so that the efficiency of slag waste heat recovery is improved.
The air distributor is characterized in that a plurality of air distributor plates 35 are arranged above the first-stage heat exchange material bed 31 at equal intervals, one end of each air distributor plate is arranged in an air flow guiding way in the middle of the blanking bin 33, the other end of each air distributor plate extends downwards to one side of the first-stage heat exchange material bed 31, and gaps for slag to slide down to the first-stage heat exchange material bed are formed between the adjacent air distributor plates 35. High-temperature molten slag is blown into the slag collecting chamber through compressed air flow, high-speed air is blown to the slag collecting chamber through the air distribution plate, the air flow speed of the air distribution plate gap is high, leakage of slag can not be caused, and even a small amount of leakage does not affect use.
The slag heat exchange device further comprises an air supply device capable of blowing cooling air flow into the bottom of the second-stage heat exchange material bed 32, the air supply device comprises a cooling air pipe 4 arranged at the bottom of the outer end of the second-stage heat exchange material bed 32, and a nozzle capable of blowing cooling air flow into the bottom of the second slag guide plate 321 is arranged on the cooling air pipe. Cooling air flow blown out from a nozzle of the cooling air pipe enters from the bottom of the second slag guide plate, and cooling and heat exchanging are carried out on slag on the second slag guide plate. The air supply device further comprises a ventilation pipe penetrating through the material receiving bin 34 and the material discharging bin 33, a first-stage slag blowing pipe 5 communicated with the ventilation pipe is arranged on the upper portion of the ventilation pipe, a nozzle inserted into the lower end of the material discharging bin is arranged on the first-stage slag blowing pipe, a second-stage slag blowing pipe 7 is arranged above the cooling air pipe, and a nozzle inserted into the second-stage heat exchange material bed 32 is arranged on the second-stage slag blowing pipe. The hot gas that produces of slag on the second slag guide plate after the cooling air treatment gets into the air distribution plate region from the bottom of first slag guide plate, and the first level blows the slag pipe and can prevent the slag of blanking storehouse from blockking up the blanking storehouse, and the slag of being convenient for removes, and the same reason, the second level blows the slag pipe and can prevent that the slag from blockking up the second level blanking storehouse.
The cooling air pipe cools the slag on the heat exchange material bed, so as to increase the temperature difference between the air and the surface of the particles, improve the heat exchange efficiency, adopt cold air and slag to perform countercurrent heat exchange for multiple times, and uniformly distribute the particles in space through multiple times of collection and distribution, and prolong the residence time of the particles; through the control to the material layer thickness, reduce air resistance, the energy saving.
For further retrieving the slag waste heat, improve waste heat utilization efficiency, airtight casing 1's lateral wall outwards is equipped with opening reposition of redundant personnel chamber 6 inwards to the evagination, be equipped with in the reposition of redundant personnel chamber rather than the wind hole 61 and the heat accumulation structure 62 of intercommunication, the heat accumulation structure passes through reposition of redundant personnel chamber 6 with the wind hole intercommunication, the cooling air current that air supply arrangement blown out is through the wind hole drainage extremely reposition of redundant personnel chamber 6 retrieves heat of radiation structure absorbing and carries the heat to get into main flue opening. The heat storage structure 62 is a porous heat storage brick commonly used in the prior art, and is arranged on the side wall of the slag flying area and used for recovering the waste heat radiated during slag granulation. The air hole is formed in the side wall of the slag collecting chamber and located between the air distribution plate and the first-stage heat exchange material bed, as the temperature of molten slag is above 1400 ℃, the proportion of radiant heat is high during granulation, porous heat storage bricks are designed on the side wall of a slag granulating flight area to recover the radiant heat as much as possible, meanwhile, a cooling air flow part blown out by the cooling air pipe passes through the first-stage heat exchange material bed and then enters the air distribution plate area, the slag staying on the air distribution plate is directly cooled and exchanged, the slag is blown to the slag collecting chamber, part of air flow is shunted to the shunt cavity through the air hole, the radiant heat absorbed by the heat storage structure is recovered and carried into the main flue, and meanwhile, the air speed in the air distribution plate area is prevented from being too high, and particles are carried into the hot air flue.
The slag wind quenching granulating mechanism comprises a main nozzle 221 arranged at the rear side below the blanking end of the slag blanking port 21, and further comprises two auxiliary nozzles 222 symmetrically arranged relative to the main nozzle, wherein the central extension lines of the two auxiliary nozzles and the central extension line of the main nozzle intersect at a point on the central extension line of the slag blanking port. The main nozzle is arranged at the rear side below the slag blanking port, and the grain size of the granulated slag meets the production requirement of the next step by controlling the air quantity and the air speed of primary air; the two auxiliary nozzles are arranged at the lower end of the main nozzle and symmetrically arranged relative to the main nozzle, the central extension lines of the two auxiliary nozzles are intersected with the central extension line of the main nozzle at a point and the point is positioned on the central extension line of the slag blanking port, the falling point of the granulated slag meets the requirement of the waste heat recovery device by controlling the air quantity and the air speed of the secondary air, meanwhile, the two auxiliary nozzles can partially offset the blown secondary air quantity relatively, the central axis of the auxiliary nozzle and the central axis of the main nozzle form an included angle alpha, the included angle alpha is 30-45 degrees, preferably 35 degrees, and the granulated slag can be prevented from being blown to the cavity wall of the slag granulating cavity by the secondary air blown out when the set angle is overlarge.
The slag wind quenching granulating mechanism 22 is provided with a nozzle angle adjusting mechanism 25 capable of adjusting the wind spraying angle of the main nozzle. This has the advantage that the adaptability of the granulating system can be increased by means of angular adjustment when the primary and secondary nozzles are not able to meet the granulating requirements.
The slag granulating chamber 20 is provided with a slag falling hole 26 which is vertically arranged, a slag falling pipe 27 which is communicated with the slag falling hole 21 is arranged in the slag falling hole, the lower end of the slag falling pipe is positioned at the front side above the main nozzle 221, the slag granulating chamber 20 is also provided with a slag accident slag discharging pipe 24 which is communicated with the slag granulating cavity 23, and the slag accident slag discharging pipe is opposite to the slag falling hole and is positioned below the slag falling pipe. Considering that slag is suddenly oversized in flow or the slag is not granulated due to sudden failure of compressed air, the slag needs to be discharged out of the granulating system in time, the slag is prevented from damaging the granulating system or flowing into the heat exchange system, an accident slag discharging pipe is designed below the slag falling pipe, and the slag which is not granulated enters the accident slag discharging pipe, so that the safety of the system is ensured.
Compared with the prior art, the high-temperature waste heat recovery device provided by the application has the following advantages when the water quenching slag is adopted to treat the slag:
1. Energy saving: in the smelting process in the prior art, about 30 percent of heat of the molten slag is carried away by the slag flushing water, and the energy grade is high; the application can recover most of the energy, can be used for preheating a blast furnace hot blast stove, generating steam, heating materials and the like, and has recovery efficiency of more than 70 percent, and the specific efficiency depends on the actual requirement;
2. Environmental protection: the heat of the original process slag is discharged to the atmosphere after being cooled by water, and a large amount of hot steam is generated due to the reaction of the high-temperature slag and the water, so that pollutants such as sulfur dioxide, hydrogen sulfide and the like are formed; the application has no other medium to participate in the reaction, only the pure heat exchange reaction is adopted, and no secondary pollution is generated;
3. The maintenance is simple: the application adopts static equipment as much as possible, and the maintenance of the static equipment is simple;
4. Safety and reliability: the application considers the high temperature condition, selects materials according to the blast furnace standard, considers the reserved allowance such as temperature change, and the like, and considers the use of multi-use static equipment to carry out the optimal design according to the temperature condition.
The foregoing description of the preferred embodiments of the present application is not intended to limit the scope of the application, but rather is presented in the claims.
Claims (6)
1. The slag heat exchange device comprises a slag heat exchange mechanism for conveying and distributing slag, and is characterized in that: the slag heat exchange mechanism (3) comprises a first-stage heat exchange material bed (31) which is obliquely arranged, the feeding end is high, and the discharging end is low, and a vent hole which can be introduced with cooling air flow to blow and float slag and move towards the discharging end is arranged at the bottom of the first-stage heat exchange material bed (31);
The first-stage heat exchange material bed (31) comprises a plurality of first slag guide plates (311) which are sequentially and downwards stacked in a step shape, gaps are arranged between the adjacent first slag guide plates, the gaps form the ventilation holes, and projections of adjacent ends of the adjacent first slag guide plates in the vertical direction are overlapped;
The slag heat exchange mechanism (3) further comprises a second-stage heat exchange material bed (32) arranged below the first-stage heat exchange material bed (31), the upper end of the second-stage heat exchange material bed (32) is arranged at the lower end of the first-stage heat exchange material bed (31), the second-stage heat exchange material bed (32) comprises a plurality of second slag guide plates (321) which are arranged in a cascade manner and are downwards stacked in sequence, gaps are arranged between adjacent second slag guide plates, and projections of adjacent ends of the adjacent second slag guide plates in the vertical direction are overlapped;
The feeding end of the first-stage heat exchange material bed (31) is provided with a blanking bin (33) communicated with the feeding end of the first-stage heat exchange material bed for conveying slag to the first-stage heat exchange material bed, and the discharging end of the second-stage heat exchange material bed (32) is provided with a receiving bin (34) communicated with the second-stage heat exchange material bed for collecting slag;
The slag heat exchange device further comprises an air supply device capable of blowing cooling air flow into the bottom of the second-stage heat exchange material bed (32), the air supply device comprises a cooling air pipe (4) arranged at the bottom of the outer end of the second-stage heat exchange material bed (32), a nozzle capable of blowing cooling air flow into the bottom of the second slag guide plate (321) is arranged on the cooling air pipe, the air supply device further comprises a ventilation pipe penetrating through the material collecting bin (34) and the material discharging bin (33), a first-stage slag blowing pipe (5) communicated with the ventilation pipe is arranged on the upper portion of the ventilation pipe, a nozzle inserted into the lower end of the material discharging bin is arranged on the first-stage slag blowing pipe, a second-stage slag blowing pipe (7) is arranged above the cooling air pipe, and a nozzle inserted into the second-stage heat exchange material bed (32) is arranged on the second-stage slag blowing pipe.
2. The slag heat exchanging apparatus of claim 1, wherein: the top of first level heat transfer material bed (31) is equipped with air distribution board (35) that the polylith equipartition interval set up, the one end of air distribution board to the middle part of blanking storehouse (33) is bent and is set up, its other end to one side downwardly extending of first level heat transfer material bed (31), and adjacent form the clearance that supplies the air current to pass through between air distribution board (35), first level heat transfer material bed (31) and second level heat transfer material bed (32) form the toper structure that the opening is to the inward end expansion gradually, toper structure is equipped with two, and two toper structure symmetry sets up.
3. The slag heat exchanging apparatus of claim 1, wherein: the slag heat exchange device further comprises a flow distribution cavity (6), an air hole (61) and a heat storage structure (62) are arranged in the flow distribution cavity and communicated with the flow distribution cavity, the heat storage structure is communicated with the air hole through the flow distribution cavity (6), cooling air flow blown out by the air supply device is led to the flow distribution cavity (6) through the air hole, and radiant heat absorbed by the heat storage structure is recovered and carried with heat to enter a main flue opening.
4. High temperature waste heat recovery device, its characterized in that: comprising a closed housing (1) provided with a slag collection chamber for collecting slag, wherein the slag collection chamber is provided with the slag heat exchange device according to any one of claims 1-3.
5. The high temperature heat recovery device according to claim 4, wherein: the high-temperature waste heat recovery device is characterized in that a feeding hole (11) communicated with the slag collecting chamber is formed in the airtight shell (1), the high-temperature waste heat recovery device further comprises a slag air quenching granulating device which is arranged on one side of the airtight shell and blows slag into the slag collecting chamber through the feeding hole by utilizing air flow, the slag air quenching granulating device comprises a slag granulating chamber (20), a slag blanking hole (21) communicated with the slag granulating chamber is formed in the slag granulating chamber, a slag granulating cavity (23) communicated with the slag blanking hole (21) and used for granulating slag by utilizing air flow is formed in the lower portion of the slag blanking hole, and a slag air quenching granulating mechanism (22) communicated with the slag granulating cavity is arranged on one side of the slag granulating cavity.
6. The high temperature heat recovery device according to claim 5, wherein: the slag wind quenching granulating mechanism comprises a main nozzle (221) arranged at the rear side below the blanking end of the slag blanking port (21), and further comprises two auxiliary nozzles (222) symmetrically arranged relative to the main nozzle, wherein the central extension lines of the two auxiliary nozzles and the central extension line of the main nozzle intersect at a point and the point is positioned on the central extension line of the slag blanking port.
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| CN201711165857.9A CN107816898B (en) | 2017-11-21 | 2017-11-21 | Slag heat exchange device and high-temperature waste heat recovery device comprising same |
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| CN201711165857.9A CN107816898B (en) | 2017-11-21 | 2017-11-21 | Slag heat exchange device and high-temperature waste heat recovery device comprising same |
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| CN107816898B true CN107816898B (en) | 2024-04-26 |
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| CN109180029A (en) * | 2018-09-13 | 2019-01-11 | 南京有荣节能科技有限公司 | A kind of liquid slag comminution granulation |
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