CN109320106B - Waste heat recovery device and process for fused magnesium fused lump - Google Patents
Waste heat recovery device and process for fused magnesium fused lump Download PDFInfo
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- CN109320106B CN109320106B CN201811469309.XA CN201811469309A CN109320106B CN 109320106 B CN109320106 B CN 109320106B CN 201811469309 A CN201811469309 A CN 201811469309A CN 109320106 B CN109320106 B CN 109320106B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
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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
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Abstract
The invention relates to a waste heat recovery device and a process of an electric smelting magnesium melting lump, wherein the device comprises an annular waste heat recovery chamber, a heat storage container, a rotary trolley and a trolley driving device; the annular waste heat recovery chamber consists of a top water-cooling wall, an inner annular water-cooling wall and an outer annular water-cooling wall which form a closed annular space, a waste heat recovery chamber inlet and a waste heat recovery chamber outlet are arranged on the side surface of the annular space, and the waste heat recovery chamber inlet and the waste heat recovery chamber outlet are adjacently arranged and are respectively sealed by an inlet door and an outlet door; a heat storage container is arranged above the annular waste heat recovery chamber and is connected with each water-cooled wall of the annular waste heat recovery chamber through a rising pipe and a falling pipe; the rotary trolley is arranged in the annular waste heat recovery chamber, is driven by the trolley driving device to do circular motion along the annular track, and is used for bearing the fused magnesium fused lump. The invention can effectively improve the waste heat recovery efficiency of the fused magnesium lump, save time and materials and stably output heat energy.
Description
Technical Field
The invention relates to the technical field of waste heat recovery of fused magnesium fused lumps, in particular to a waste heat recovery device and a waste heat recovery process of fused magnesium fused lumps.
Background
In the process of producing the electric smelting magnesium magnesite, magnesium smelting lump is formed after the magnesite is smelted. The production process requires that the magnesium fused lump can be naturally cooled only and can not be forcedly cooled so as not to influence the crystallization effect of the magnesia; meanwhile, the magnesium fused lump contains huge waste heat resources for recycling.
At present, a domestic waste heat recovery device generally adopts a tunnel type waste heat recovery boiler, a hot magnesium melting lump longitudinally advances in a tunnel, the outer wall of the tunnel is a heat absorption tube bundle, and as time goes on, the magnesium melting lump is gradually cooled, and the emitted heat is recovered by the waste heat recovery device. The magnesium fused lumps are fed into the waste heat recovery device one by one according to the requirements of the production process, and are discharged from the waste heat recovery device one by one after being cooled for a certain time. Because the natural cooling time of the fused magnesium lump is long (more than 4 hours), the initial cooling temperature is 1200 ℃ and the difference between the initial cooling temperature and the discharge temperature (about 200 ℃) is large, the heat absorption quantity of the waste heat recovery device fluctuates greatly. The heat absorption capacity of the waste heat recovery device gradually decreases along with the natural cooling time of the magnesium melting lump, and after a new magnesium melting lump is sent into the waste heat recovery device, the heat absorption capacity of the waste heat recovery device suddenly increases and then gradually decreases, and the process is repeated.
The main problem of the waste heat recovery method is that the waste heat recovery device has uneven heat distribution in the early and later stages of waste heat recovery, and the external steam supply quantity of the waste heat recovery device has great fluctuation. And the temperature difference between the front heating surface and the tail heating surface of the tunnel type waste heat recovery device is also larger. The heat absorption capacity of the tail heating surface is rapidly reduced along with the transition of the cooling time of the magnesium melting lump. Due to the reduction of the heat transfer temperature difference, according to the radiation heat transfer principle, the heat absorption capacity of the tail heating surface is rapidly reduced in a fourth power proportion, the cooling speed is rapidly reduced, and the cooling time of the magnesium fused lump is prolonged. Compared with the natural cooling process without waste heat recovery, the method has the advantages of smaller cooling temperature difference, long cooling time, lower production efficiency and large metal material consumption. Meanwhile, the steam-water flow of the waste heat recovery device is not smooth, the circulation rate is reduced too fast, and then the tail heating surface cannot generate steam, so that the waste heat recovery effect of the whole waste heat recovery device is affected.
Disclosure of Invention
The invention provides a waste heat recovery device and a waste heat recovery process for an electric smelting magnesium smelting lump, which can effectively improve the waste heat recovery efficiency of the electric smelting magnesium smelting lump, save time and materials and can stably output heat energy.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the waste heat recovery device of the fused magnesium fused lump comprises an annular waste heat recovery chamber, a heat storage container, a rotary trolley and a trolley driving device; the annular waste heat recovery chamber consists of a top water-cooling wall, an inner annular water-cooling wall and an outer annular water-cooling wall which form a closed annular space, a waste heat recovery chamber inlet and a waste heat recovery chamber outlet are arranged on the side surface of the annular space, and the waste heat recovery chamber inlet and the waste heat recovery chamber outlet are adjacently arranged and are respectively sealed by an inlet door and an outlet door; a heat storage container is arranged above the annular waste heat recovery chamber and is connected with each water-cooled wall of the annular waste heat recovery chamber through a rising pipe and a falling pipe; the rotary trolley is arranged in the annular waste heat recovery chamber, is driven by the trolley driving device to do circular motion along the annular track, and is used for bearing the fused magnesium fused lump.
The bottom end of the outer ring water-cooled wall is communicated with the outer ring of the lower header, and the bottom end of the inner ring water-cooled wall is communicated with the inner ring of the lower header; the top end of the outer ring water-cooling wall is communicated with the outer end of the top water-cooling wall through an upper header outer ring, and the top end of the inner ring water-cooling wall is communicated with the inner end of the top water-cooling wall through an upper header inner ring; the inner ring of the lower header is communicated with the heat storage container through a central pipe, and the central pipe is communicated with the heat storage container through an inner down pipe; the outer ring of the lower header is communicated with the heat storage container through an outer down pipe; the inner ring of the upper header is connected with the heat storage container through a plurality of ascending pipes.
The top water-cooling wall, the inner ring water-cooling wall and the outer ring water-cooling wall are membrane water-cooling walls; the outer sides of the water cooling walls are respectively provided with a heat insulation layer and a protective layer; a waterproof plate is arranged at the top of a circular space surrounded by the inner ring water cooling wall.
The outer side of the annular waste heat recovery chamber is provided with a steel structure bracket, the annular waste heat recovery chamber is hung on the steel structure bracket, and the bottoms of the inner ring of the lower header and the outer ring of the lower header are connected with the ground in a sealing way through flexible sealing elements; the heat storage container is arranged on the steel structure bracket.
The rotary trolley comprises a bearing table surface, a wheel set and an independent suspension; the bearing table top is formed by connecting a plurality of sections of table tops, one or more groups of wheel sets are arranged below each section of table top, and each section of table top is connected with the corresponding wheel set through an independent suspension; the wheel set comprises an inner ring wheel set and an outer ring wheel set, wherein the turning radius of the outer ring wheel set is larger than that of the inner ring wheel set; a plurality of limit seats are arranged on the inner side of the annular track along the circumferential direction, and rolling pulleys are arranged at positions corresponding to the table tops on one sides of the limit seats facing the rotary trolley; the trolley driving device is arranged outside the annular waste heat recovery chamber and consists of a motor, a speed reducer and a transmission device.
The rotary trolley is made of heat-resistant steel, and the outer surface of the rotary trolley is provided with a low-emissivity material coating or a heat radiation reflecting layer.
The waste heat recovery chamber inlet is provided with an inlet channel along the tangential direction of the annular space, the waste heat recovery chamber outlet is provided with an outlet channel along the tangential direction of the annular space, the inlet channel and the outlet channel are both constructed by refractory materials, and the inner side of the channel is respectively provided with a low-emissivity material coating or a heat radiation reflecting layer.
The low emissivity material coating is a chromium plating layer, and the thermal radiation reflecting layer is a tin foil reflecting layer.
The inlet door and the outlet door are both quick-opening and closing type rolling doors.
The waste heat recovery process of the fused magnesium lump adopts the waste heat recovery device of the fused magnesium lump, and specifically comprises the following steps:
1) The electric smelting magnesium melting lump is loaded by a magnesium melting lump conveying trolley, enters the annular waste heat recovery chamber through a waste heat recovery chamber inlet, is pushed onto a rotary trolley through a pushing device carried on the magnesium melting lump conveying trolley, and immediately closes an inlet door after the magnesium melting lump conveying trolley after being discharged exits the annular waste heat recovery chamber;
2) Starting a trolley driving device, and enabling the fused magnesium melting lump to move along the annular track along with the rotary trolley; the pressure in the heat storage container is maintained at 1.2-1.6 MPa, and the water temperature is 190-200 ℃; the water in the heat storage container enters the inner ring of the lower header through the inner downcomer, enters the outer ring of the lower header through the outer downcomer, and then enters each water-cooled wall forming the annular waste heat recovery chamber; the surface temperature of the fused magnesium lump is 1000-1200 ℃, radiation heat transfer is carried out between the fused magnesium lump and each water-cooled wall in the moving process, and the relatively uniform heat exchange of each water-cooled wall is ensured by adjusting the moving speed of the rotary trolley;
3) In the annular waste heat recovery chamber, after the 1 st fused magnesium fused lump is subjected to heat exchange and cooling for a period of time, adding the 2 nd fused magnesium fused lump according to the step 1), and rotating the rotary trolley reversely or in the same direction on an annular track according to the cooling condition of the fused magnesium fused lump; sequentially adding the 3 rd and the 4 th fused magnesium fused lumps, and finally ensuring that at least 4 fused magnesium fused lumps are subjected to heat exchange and cooling in the annular waste heat recovery chamber;
4) The heat of the fused magnesium melt lump absorbed by the annular waste heat recovery chamber is mainly stored in a heat storage container, and the heat storage container stores and supplies energy; firstly, calculating the optimal rated external steam supply quantity, and controlling the pressure of the external steam supply through a pressure regulating valve; in the initial stage of cooling the fused magnesia lump, the absorbed heat is larger than the external heat supply, the absorbed heat is stored in a heat storage container, the pressure in the heat storage container is increased at the moment, the temperature in each water cooling wall is increased, and the radiation heat absorption rate is relatively reduced; at the end of cooling of the fused magnesium lump, the absorbed heat is smaller than the external heat supply quantity, and steam is released by utilizing the flash evaporation principle of water through the pressure difference between the pressure in the heat storage container and the external heat supply pressure; at the moment, the temperature in each water-cooled wall is reduced, and the radiation heat absorption rate is relatively increased; the heat storage container is utilized, so that the stability of output steam parameters can be maintained, and the heat absorption rate of heat radiation can be regulated, and the trends of the output steam parameter and the heat absorption rate are opposite, thereby realizing the self-balance of the waste heat recovery system;
5) The cooled electric smelting magnesium smelting lump is discharged from the bearing table surface of the rotary trolley to the magnesium smelting lump conveying trolley through the discharge device carried on the magnesium smelting lump conveying trolley and is transported outwards, and the magnesium smelting lump conveying trolley moves along the conveying trolley track.
Compared with the prior art, the invention has the beneficial effects that:
1) Compared with the existing waste heat recovery device, the waste heat recovery device can improve the waste heat recovery efficiency by more than 50%, the heating surface of the waste heat recovery device is heated more uniformly by adopting a rotary cooling process, and meanwhile, the circulation multiplying power of a steam-water system is improved due to the improvement of steam-water flow, so that the heat transfer coefficient is greatly increased, and the heat transfer efficiency is improved;
2) The invention improves the waste heat recovery efficiency, so that the same amount of heat can be absorbed by fewer heating surfaces, the manufacturing cost is saved, and the investment is saved;
3) The wall temperature of each water-cooled wall is relatively constant, the rotation speed of the rotary trolley is adjustable, the rotary trolley can rotate in both directions, and the operation is flexible; the temperature drop rate of the fused magnesia fused lump can be controlled by controlling the rotation speed of the rotary trolley, so that the natural cooling process of the fused magnesia fused lump is simulated, the quality of products can be ensured, the cooling time can be reduced, and the production efficiency is improved;
4) The external steam supply parameter is stabilized through the heat storage container, so that the great fluctuation of heat recovery caused in the cycle process of adding, cooling, discharging and adding the fused magnesium lump is greatly reduced, and a relatively stable air source is created for the subsequent process;
5) The waste heat recovery device adopts a circular structure, so that the occupied area is greatly reduced, and the land utilization degree is higher;
6) The trolley driving device is arranged outside the annular waste heat recovery chamber, so that the service life of the equipment can be effectively prolonged, and the failure rate can be reduced;
7) The waste heat recovery chamber inlet and the waste heat recovery chamber outlet can be arranged in any direction, so that the process arrangement is very flexible during engineering application, and the adaptability to the environment is strong;
8) The heat storage container is used for generating saturated steam and can be used for heating, refrigerating or generating electricity;
9) The parts of the rotary trolley, the inlet channel, the outlet channel and the like which do not participate in waste heat recovery are all coated by a low-emissivity material coating or a heat radiation reflecting layer, so that the temperature rise of corresponding parts can be limited, the service life of the rotary trolley is prolonged, radiation heat can be prevented from being dissipated, heat loss is reduced, and the heat absorption efficiency is improved;
10 The bottom of the annular waste heat recovery chamber is provided with a flexible sealing structure, the top of the annular waste heat recovery chamber is provided with a waterproof plate, and the annular waste heat recovery chamber is of a full-sealing structure, is environment-friendly and does not diffuse polluted dust;
11 The cooling process of the fused magnesia lump in the waste heat recovery device is natural radiation cooling, forced air cooling is not needed, the fused magnesia lump has good crystallization effect, and the defect caused by forced air cooling is thoroughly overcome.
Drawings
Fig. 1 is a front view of a waste heat recovery device for an electric smelting magnesium smelting lump.
Fig. 2 is A-A view of fig. 1.
Fig. 3 is a view B-B of fig. 1.
Fig. 4 is a view of C-C in fig. 1.
In the figure: 1. the heat recovery system comprises an annular waste heat recovery chamber 1-1, a top water cooling wall 1-2, an inner annular water cooling wall 1-3, an outer annular water cooling wall 1-4, a waste heat recovery chamber inlet 1-5, a waste heat recovery chamber outlet 1-6, a refractory material 1-7, a low emissivity material coating/heat radiation reflection layer 2, a rotary trolley 2-1, a bearing table top 2-2, a wheel set 2-3, an independent suspension 3, a trolley driving device 3-1, a motor 3-2, a speed reducer 3-3, a transmission device 4, an annular track 5, a limit seat 6, a rolling pulley 7, a magnesium fusion lump conveying trolley 8, a heat storage container 8-1, a safety valve 8-2, an external steam supply valve 8-3, a pressure gauge 8-4, a water level gauge 9, a lower box inner ring 10, a lower box outer ring 11, an upper box inner ring 12, an upper outer ring 13, a flexible sealing member 14, a heat insulation layer 15, a waterproof plate 16, an inner drop tube 18, an outer drop tube 19, a middle tube 20, an electric fusion magnesium fusion lump 21, a conveying trolley track 22 and a structural support frame
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1-4, the waste heat recovery device for the fused magnesium lump comprises an annular waste heat recovery chamber 1, a heat storage container 8, a rotary trolley 2 and a trolley driving device 3; the annular waste heat recovery chamber 1 is a closed annular space formed by a top water-cooled wall 1-1, an inner annular water-cooled wall 1-2 and an outer annular water-cooled wall 1-3, a waste heat recovery chamber inlet 1-4 and a waste heat recovery chamber outlet 1-5 are arranged on the side surface of the annular space, and the waste heat recovery chamber inlet 1-4 and the waste heat recovery chamber outlet 1-5 are adjacently arranged and are respectively closed through an inlet door and an outlet door; a heat storage container 8 is arranged above the annular waste heat recovery chamber 1, and the heat storage container 8 is connected with each water-cooled wall 1-1, 1-2 and 1-3 of the annular waste heat recovery chamber 1 through a rising pipe and a falling pipe 17 and 18; the rotary trolley 2 is arranged in the annular waste heat recovery chamber 1, is driven by the trolley driving device 3 to do circular motion along the annular track 5, and the rotary trolley 2 is used for bearing the fused magnesium fused lump 20.
The bottom ends of the outer annular water-cooled walls 1-3 are communicated through a lower header outer ring 10, and the bottom ends of the inner annular water-cooled walls 1-2 are communicated through a lower header inner ring 9; the top end of the outer ring water-cooled wall 1-3 is communicated with the outer end of the top water-cooled wall 1-1 through an upper header outer ring 12, and the top end of the inner ring water-cooled wall 1-2 is communicated with the inner end of the top water-cooled wall 1-1 through an upper header inner ring 11; the lower header inner ring 9 is communicated with the central pipe 19, and the central pipe 19 is communicated with the heat storage container 8 through the inner downcomer 17; the lower header outer ring 10 is communicated with the heat storage container 8 through an outer downcomer 18; the upper header inner ring 11 is connected to the heat storage container 8 through a plurality of rising pipes.
The top water-cooling wall 1-1, the inner annular water-cooling wall 1-2 and the outer annular water-cooling wall 1-3 are membrane water-cooling walls; the outer sides of the water cooling walls 1-1, 1-2 and 1-3 are respectively provided with a heat insulation layer 14 and a protective layer 15; the top of the circular space surrounded by the inner ring water cooling wall 1-2 is provided with a waterproof plate 16.
The outer side of the annular waste heat recovery chamber 1 is provided with a steel structure support 22, the annular waste heat recovery chamber 1 is hung on the steel structure support 22, and the bottoms of the lower header inner ring 9 and the lower header outer ring 10 are in sealing connection with the ground through a flexible sealing piece 14; the thermal storage container 8 is provided on the steel structural bracket 22.
The rotary trolley 2 comprises a bearing table top 2-1, a wheel set 2-2 and an independent suspension 2-3; the bearing table top 2-1 is formed by connecting a plurality of sections of table tops, one or more groups of wheel sets 2-2 are arranged below each section of table top, and each section of table top is connected with the corresponding wheel set 2-2 through an independent suspension 2-3; the wheel set 2-2 comprises an inner ring wheel set and an outer ring wheel set, wherein the turning radius of the outer ring wheel set is larger than that of the inner ring wheel set; a plurality of limit seats 5 are arranged on the inner side of the annular track 4 along the circumferential direction, and a rolling pulley 6 is arranged at a position corresponding to the table surface on one side of the limit seat 5 facing the rotary trolley 2; the trolley driving device 3 is arranged outside the annular waste heat recovery chamber 1 and consists of a motor 3-1, a speed reducer 3-2 and a transmission device 3-3.
The rotary trolley 2 is made of heat-resistant steel, and the outer surface of the rotary trolley 2 is provided with a low-emissivity material coating or a heat radiation reflecting layer 1-7.
The waste heat recovery chamber inlet 1-4 is provided with an inlet channel along the tangential direction of the annular space, the waste heat recovery chamber outlet 1-5 is provided with an outlet channel along the tangential direction of the annular space, the inlet channel and the outlet channel are both constructed by refractory materials 1-6, and the inner sides of the channels are respectively provided with a low-emissivity material coating or a thermal radiation reflecting layer 1-7.
The low emissivity material coating is a chromium plating layer, and the thermal radiation reflecting layer is a tin foil reflecting layer.
The inlet door and the outlet door are both quick-opening and closing type rolling doors.
The waste heat recovery process of the fused magnesium lump adopts the waste heat recovery device of the fused magnesium lump, and specifically comprises the following steps:
1) The electric smelting magnesium melting lump 20 is loaded by a magnesium melting lump conveying trolley 7, enters the annular waste heat recovery chamber 1 through a waste heat recovery chamber inlet 1-4, is pushed onto the rotary trolley 2 by a pushing device carried on the magnesium melting lump conveying trolley 7, and immediately closes an inlet door after the magnesium melting lump conveying trolley 7 after being discharged exits the annular waste heat recovery chamber 1;
2) Starting the trolley driving device 3, and enabling the fused magnesium melting lump 20 to move along the annular track 4 along with the rotary trolley 2; the pressure in the heat storage container 8 is maintained at 1.2-1.6 MPa, and the water temperature is 190-200 ℃; the water in the heat storage container 8 enters the lower header inner ring 9 through the inner downcomer 17, simultaneously enters the lower header outer ring 10 through the outer downcomer 18, and then enters the water-cooled walls 1-1, 1-2 and 1-3 forming the annular waste heat recovery chamber 1; the surface temperature of the fused magnesium lump 20 is 1000-1200 ℃, radiation heat transfer is carried out between the fused magnesium lump and each water-cooled wall 1-1, 1-2 and 1-3 in the moving process, and the relatively uniform heat exchange of each water-cooled wall is ensured by adjusting the moving speed of the rotary trolley 2;
3) In the annular waste heat recovery chamber 1, after the 1 st fused magnesium fused lump 20 is subjected to heat exchange and cooling for a period of time, adding the 2 nd fused magnesium fused lump 20 according to the step 1), and rotating the rotary trolley 2 reversely or in the same direction on the annular track 4 according to the cooling condition of the fused magnesium fused lump 20; sequentially adding the 3 rd and 4 th fused magnesium fused lumps 20, and finally ensuring that at least 4 fused magnesium fused lumps 20 are subjected to heat exchange and cooling in the annular waste heat recovery chamber 1;
4) The heat of the fused magnesium melt lump absorbed by the annular waste heat recovery chamber 1 is mainly stored in the heat storage container 8, and the heat storage container 8 stores and supplies energy; firstly, calculating the optimal rated external steam supply quantity, and controlling the pressure of the external steam supply through a pressure regulating valve; in the initial stage of cooling the fused magnesium lump 20, the absorbed heat is larger than the external heat supply, the absorbed heat is stored in the heat storage container 8, the pressure in the heat storage container 8 is increased at the moment, the temperature in each water cooling wall 1-1, 1-2 and 1-3 is increased, and the radiation heat absorption rate is relatively reduced; at the end of cooling of the fused magnesium melting lump 20, the absorbed heat is smaller than the external heat supply, and steam is released by utilizing the flash evaporation principle of water through the pressure difference between the pressure in the heat storage container 8 and the external heat supply pressure; at this time, the temperature in each water cooling wall 1-1, 1-2 and 1-3 is reduced, and the radiation heat absorption rate is relatively increased; the heat storage container 8 is utilized, so that the stability of the output steam parameters can be maintained, the heat absorption rate of heat radiation can be regulated, and the trends of the output steam parameters and the heat absorption rate are opposite, thereby realizing the self-balance of the waste heat recovery system;
5) The cooled electric smelting magnesium smelting lump 20 is discharged from the bearing table surface 2-1 of the rotary trolley 2 to the magnesium smelting lump conveying trolley 7 through a discharge device carried on the magnesium smelting lump conveying trolley 7 for outward transportation, and the magnesium smelting lump conveying trolley 7 moves along the conveying trolley track 21.
The heat storage container 8 is arranged above the annular waste heat recovery chamber 1 and comprises accessories such as a steam-water separation device, a safety valve 8-1, an external steam supply valve 8-2, a pressure gauge 8-3, a water level gauge 8-4 and the like, and the heat storage container 8 is preferably a pressure container which takes water as a medium and has high capacity and heat storage capacity. The heat storage container 8 is connected to an external steam supply pipe or water supply pipe.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The waste heat recovery device of the fused magnesium melting lump is characterized by comprising an annular waste heat recovery chamber, a heat storage container, a rotary trolley and a trolley driving device; the annular waste heat recovery chamber consists of a top water-cooling wall, an inner annular water-cooling wall and an outer annular water-cooling wall which form a closed annular space, a waste heat recovery chamber inlet and a waste heat recovery chamber outlet are arranged on the side surface of the annular space, and the waste heat recovery chamber inlet and the waste heat recovery chamber outlet are adjacently arranged and are respectively sealed by an inlet door and an outlet door; a heat storage container is arranged above the annular waste heat recovery chamber and is connected with each water-cooled wall of the annular waste heat recovery chamber through a rising pipe and a falling pipe; the rotary trolley is arranged in the annular waste heat recovery chamber, is driven by the trolley driving device to do circular motion along the annular track, and is used for bearing the fused magnesium fused lump.
2. The waste heat recovery device of the fused magnesium fused lump according to claim 1, wherein the bottom end of the outer ring water-cooled wall is communicated through the outer ring of the lower header, and the bottom end of the inner ring water-cooled wall is communicated through the inner ring of the lower header; the top end of the outer ring water-cooling wall is communicated with the outer end of the top water-cooling wall through an upper header outer ring, and the top end of the inner ring water-cooling wall is communicated with the inner end of the top water-cooling wall through an upper header inner ring; the inner ring of the lower header is communicated with the heat storage container through a central pipe, and the central pipe is communicated with the heat storage container through an inner down pipe; the outer ring of the lower header is communicated with the heat storage container through an outer down pipe; the inner ring of the upper header is connected with the heat storage container through a plurality of ascending pipes.
3. The waste heat recovery device of the fused magnesium fused lump according to claim 1, wherein the top water-cooled wall, the inner ring water-cooled wall and the outer ring water-cooled wall are membrane water-cooled walls; the outer sides of the water cooling walls are respectively provided with a heat insulation layer and a protective layer; a waterproof plate is arranged at the top of a circular space surrounded by the inner ring water cooling wall.
4. The waste heat recovery device of the fused magnesium fused lump according to claim 1, wherein a steel structure support is arranged on the outer side of the annular waste heat recovery chamber, the annular waste heat recovery chamber is hung on the steel structure support, and the bottoms of the inner ring of the lower header and the outer ring of the lower header are connected with the ground in a sealing way through flexible sealing elements; the heat storage container is arranged on the steel structure bracket.
5. The waste heat recovery device of the fused magnesium fused lump according to claim 1, wherein the rotary trolley comprises a bearing table surface, a wheel set and an independent suspension; the bearing table top is formed by connecting a plurality of sections of table tops, one or more groups of wheel sets are arranged below each section of table top, and each section of table top is connected with the corresponding wheel set through an independent suspension; the wheel set comprises an inner ring wheel set and an outer ring wheel set, wherein the turning radius of the outer ring wheel set is larger than that of the inner ring wheel set; a plurality of limit seats are arranged on the inner side of the annular track along the circumferential direction, and rolling pulleys are arranged at positions corresponding to the table tops on one sides of the limit seats facing the rotary trolley; the trolley driving device is arranged outside the annular waste heat recovery chamber and consists of a motor, a speed reducer and a transmission device.
6. The device for recovering waste heat of fused magnesium fused lumps according to claim 1, wherein the rotary trolley is made of heat-resistant steel, and the outer surface of the rotary trolley is provided with a low-emissivity material coating or a heat radiation reflecting layer.
7. The device for recovering waste heat of fused magnesium fused lump according to claim 1, wherein the inlet of the waste heat recovery chamber is provided with an inlet channel along the tangential direction of the annular space, the outlet of the waste heat recovery chamber is provided with an outlet channel along the tangential direction of the annular space, the inlet channel and the outlet channel are both constructed by refractory materials, and the inner side of the channel is respectively provided with a low-emissivity material coating or a heat radiation reflecting layer.
8. The device for recovering waste heat of an electric smelting magnesium melting lump according to claim 6 or 7, wherein the low emissivity material coating is a chromium plating layer, and the heat radiation reflecting layer is a tin foil reflecting layer.
9. The device for recovering waste heat of an electric smelting magnesium smelting lump according to claim 1, wherein the inlet door and the outlet door are both quick-opening and closing type rolling doors.
10. The waste heat recovery process of the fused magnesium lump is characterized by adopting the waste heat recovery device of the fused magnesium lump as set forth in any one of claims 1 to 9, and specifically comprising the following steps:
1) The electric smelting magnesium melting lump is loaded by a magnesium melting lump conveying trolley, enters the annular waste heat recovery chamber through a waste heat recovery chamber inlet, is pushed onto a rotary trolley through a pushing device carried on the magnesium melting lump conveying trolley, and immediately closes an inlet door after the magnesium melting lump conveying trolley after being discharged exits the annular waste heat recovery chamber;
2) Starting a trolley driving device, and enabling the fused magnesium melting lump to move along the annular track along with the rotary trolley; the pressure in the heat storage container is maintained at 1.2-1.6 MPa, and the water temperature is 190-200 ℃; the water in the heat storage container enters the inner ring of the lower header through the inner downcomer, enters the outer ring of the lower header through the outer downcomer, and then enters each water-cooled wall forming the annular waste heat recovery chamber; the surface temperature of the fused magnesium lump is 1000-1200 ℃, radiation heat transfer is carried out between the fused magnesium lump and each water-cooled wall in the moving process, and the relatively uniform heat exchange of each water-cooled wall is ensured by adjusting the moving speed of the rotary trolley;
3) In the annular waste heat recovery chamber, after the 1 st fused magnesium fused lump is subjected to heat exchange and cooling for a period of time, adding the 2 nd fused magnesium fused lump according to the step 1), and rotating the rotary trolley reversely or in the same direction on an annular track according to the cooling condition of the fused magnesium fused lump; sequentially adding the 3 rd and the 4 th fused magnesium fused lumps, and finally ensuring that at least 4 fused magnesium fused lumps are subjected to heat exchange and cooling in the annular waste heat recovery chamber;
4) The heat of the fused magnesium melt lump absorbed by the annular waste heat recovery chamber is mainly stored in a heat storage container, and the heat storage container stores and supplies energy; firstly, calculating the optimal rated external steam supply quantity, and controlling the pressure of the external steam supply through a pressure regulating valve; in the initial stage of cooling the fused magnesia lump, the absorbed heat is larger than the external heat supply, the absorbed heat is stored in a heat storage container, the pressure in the heat storage container is increased at the moment, the temperature in each water cooling wall is increased, and the radiation heat absorption rate is relatively reduced; at the end of cooling of the fused magnesium lump, the absorbed heat is smaller than the external heat supply quantity, and steam is released by utilizing the flash evaporation principle of water through the pressure difference between the pressure in the heat storage container and the external heat supply pressure; at the moment, the temperature in each water-cooled wall is reduced, and the radiation heat absorption rate is relatively increased; the heat storage container is utilized, so that the stability of output steam parameters can be maintained, and the heat absorption rate of heat radiation can be regulated, and the trends of the output steam parameter and the heat absorption rate are opposite, thereby realizing the self-balance of the waste heat recovery system;
5) The cooled electric smelting magnesium smelting lump is discharged from the bearing table surface of the rotary trolley to the magnesium smelting lump conveying trolley through the discharge device carried on the magnesium smelting lump conveying trolley and is transported outwards, and the magnesium smelting lump conveying trolley moves along the conveying trolley track.
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| CN201811469309.XA CN109320106B (en) | 2018-12-04 | 2018-12-04 | Waste heat recovery device and process for fused magnesium fused lump |
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| CN201811469309.XA CN109320106B (en) | 2018-12-04 | 2018-12-04 | Waste heat recovery device and process for fused magnesium fused lump |
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| CN109320106B true CN109320106B (en) | 2023-09-15 |
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| CN101870560A (en) * | 2010-06-18 | 2010-10-27 | 北京大学 | Method for recovering waste heat of electrically fused magnesium fused weight |
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| CN204154124U (en) * | 2014-08-29 | 2015-02-11 | 东北大学 | A kind of water cooled wall type magnesium fusing lump afterheat retracting device |
| CN209307231U (en) * | 2018-12-04 | 2019-08-27 | 中冶焦耐(大连)工程技术有限公司 | A kind of waste-heat recovery device of electrically fused magnesium fused weight |
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| CN101870560A (en) * | 2010-06-18 | 2010-10-27 | 北京大学 | Method for recovering waste heat of electrically fused magnesium fused weight |
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