CN109707471B - Method and system for utilizing waste heat of fused magnesium melting lump - Google Patents
Method and system for utilizing waste heat of fused magnesium melting lump Download PDFInfo
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- CN109707471B CN109707471B CN201811469239.8A CN201811469239A CN109707471B CN 109707471 B CN109707471 B CN 109707471B CN 201811469239 A CN201811469239 A CN 201811469239A CN 109707471 B CN109707471 B CN 109707471B
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- 239000002918 waste heat Substances 0.000 title claims abstract description 162
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 239000011777 magnesium Substances 0.000 title claims abstract description 150
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 150
- 238000002844 melting Methods 0.000 title claims abstract description 96
- 230000008018 melting Effects 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011084 recovery Methods 0.000 claims abstract description 134
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 116
- 238000003723 Smelting Methods 0.000 claims abstract description 58
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 34
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 33
- 238000005338 heat storage Methods 0.000 claims description 18
- 230000000630 rising effect Effects 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method and a system for utilizing waste heat of an electric smelting magnesium smelting lump, wherein the molten electric smelting magnesium smelting lump is sequentially sent into a magnesium smelting lump waste heat recovery chamber, a shell-broken magnesium smelting lump waste heat recovery chamber and a self-deoxidizing magnesium smelting lump waste heat recovery chamber to respectively recover waste heat; and the condensation water of the steam turbine exchanges heat with the electric smelting magnesium melting lump in the unshelling process, then the steam turbine enters a waste heat recovery chamber of the self-deoxidizing magnesium melting lump to exchange heat with the unshelling electric smelting magnesium melting lump to generate saturated water, and the saturated water exchanges heat with the electric smelting magnesium melting lump which is just melted and then enters a flash tank to generate saturated steam to enter the steam turbine for generating electricity. According to the invention, the fused magnesium fused lump sequentially enters three waste heat recovery devices to recover waste heat in stages, and finally generated saturated steam is used for dragging a steam turbine to generate power; the system has stable heat source output, high heat conversion rate and high waste heat recovery efficiency.
Description
Technical Field
The invention relates to the technical field of electric smelting magnesium melting lump waste heat recovery, in particular to an electric smelting magnesium melting lump waste heat utilization method and system.
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.
At present, a tunnel type waste heat recovery boiler is commonly adopted as a device for recovering waste heat of an electric smelting magnesium melting lump in China, the incandescent magnesium melting lump longitudinally advances in a tunnel, the outer wall of the tunnel is a heat absorption tube bundle, the magnesium melting lump is gradually cooled along with the time, and the emitted heat is recovered by the waste heat recovery device. The magnesium fused lumps are sent into the waste heat recovery device one by one according to the requirements of the production process, and are discharged one by one after being cooled for a certain time. Because the natural cooling time of the fused magnesium fused lump is long (more than 4 hours), the initial cooling temperature (about 1200 ℃) and the discharge temperature (about 200 ℃) are greatly different, and therefore the heat absorption quantity of the waste heat recovery device greatly fluctuates. 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 again, so that the magnesium melting lump is circulated and reciprocated. The main problem with the above method is therefore that the output heat source is not stable; on the other hand, no report of utilizing the waste heat of the fused magnesium melt lump to generate electricity and realize industrial application exists at present.
Disclosure of Invention
The invention provides a method and a system for utilizing waste heat of an electric smelting magnesium melting lump, wherein the electric smelting magnesium melting lump sequentially enters three waste heat recovery devices to recover waste heat in stages, and finally generated saturated steam is used for dragging a steam turbine to generate power; the system has stable heat source output, high heat conversion rate and high waste heat recovery efficiency.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a method for utilizing waste heat of an electric smelting magnesium smelting lump comprises the following steps:
1) The molten electric smelting magnesium melting lump is sequentially sent into a molten magnesium melting lump waste heat recovery chamber, a broken-shell magnesium melting lump waste heat recovery chamber and a self-deoxidizing magnesium melting lump waste heat recovery chamber to respectively recover waste heat, and the electric smelting magnesium melting lump after the waste heat recovery and cooling is sent to the next working procedure;
2) Delivering the turbine condensate below 40 ℃ into a broken-shell magnesium fused lump waste heat recovery chamber, exchanging heat with the unshelling fused magnesium fused lump, heating to more than 80 ℃, delivering the turbine condensate into a self-deoxidizing magnesium fused lump waste heat recovery chamber, exchanging heat with the unshelling fused magnesium fused lump, and heating to saturated water above 104 ℃;
3) The saturated water is pumped into a waste heat recovery chamber of the molten magnesium melting lump through a water supply pump to exchange heat with the freshly melted molten magnesium melting lump to form hot water with the pressure of more than 2MPa and the temperature of 150-200 ℃, and then enters a flash evaporation tank to generate saturated steam with the pressure of 0.5-1.8 MPa; the flash water flows back from the bottom of the flash tank to the self-deoxidizing magnesium smelting lump waste heat recovery chamber for recycling;
4) Saturated steam enters a steam-water separator, is subjected to steam-water separation and reheating, and then enters a steam turbine for power generation, and condensed water separated by the steam-water separator flows back to a self-deoxidizing magnesium melting lump waste heat recovery chamber for recycling; and the steam discharged from the steam turbine enters a condenser for condensation, and then is sent into a broken-shell magnesium melting lump waste heat recovery chamber by a condensate pump for recycling.
An inlet regulating valve is arranged at the inlet of the flash tank and used for controlling the pressure in the flash tank, and an outlet regulating valve is arranged at the bottom of the flash tank and used for controlling the water level in the flash tank to be the running water level.
And a water supplementing port is arranged at the hot well of the condenser.
The main body of the molten magnesium melting lump waste heat recovery chamber is an annular waste heat recovery chamber, a closed annular space is formed by water cooling walls, and the annular space is a movable cooling channel of the electric melting magnesium melting lump; the top of the annular waste heat recovery chamber is provided with a heat storage container 15 which is connected with the water cooling wall through a rising pipe and a falling pipe.
The main body of the self-deoxidizing magnesium melting lump waste heat recovery chamber is an annular waste heat recovery chamber, a closed annular space is formed by water cooling walls, and the annular space is a movable cooling channel of the electric melting magnesium melting lump; the top of the annular waste heat recovery chamber is provided with a steam drum, the top of the steam drum is provided with an oxygen removing head, and the steam drum is connected with the water cooling wall through a rising pipe and a falling pipe.
The shell-broken magnesium fused lump waste heat recovery chamber is a heat exchanger type waste heat recovery chamber.
The electric smelting magnesium smelting lump waste heat utilization system for realizing the method comprises a smelting magnesium smelting lump waste heat recovery chamber, a shell-broken magnesium smelting lump waste heat recovery chamber, a self-deoxidizing magnesium smelting lump waste heat recovery chamber, a flash tank, a steam-water separator, a steam turbine and a condenser; the main bodies of the molten magnesium melting lump waste heat recovery chamber and the self-deoxidizing magnesium melting lump waste heat recovery chamber are annular waste heat recovery chambers, and a closed annular space is formed by water cooling walls and is a movable cooling channel of the electric melting magnesium melting lump; a heat storage container is arranged at the top of the annular waste heat recovery chamber corresponding to the molten magnesium lump waste heat recovery chamber, and the heat storage container is connected with a corresponding water-cooled wall through a rising pipe and a falling pipe; the top of the annular waste heat recovery chamber corresponding to the self-deoxidizing magnesium melting lump waste heat recovery chamber is provided with a steam drum, the top of the steam drum is provided with a deoxidizing head, and the steam drum is connected with a corresponding water-cooled wall through a rising pipe and a falling pipe; the shell-broken magnesium fused lump waste heat recovery chamber is a heat exchanger type waste heat recovery chamber; the steam outlet of the steam turbine is connected with a heat exchange water inlet of the broken-shell magnesium melting lump waste heat recovery chamber through a condenser and a condensate pump, and the heat exchange water outlet of the broken-shell magnesium melting lump waste heat recovery chamber is connected with a water inlet on the deaeration head; the saturated water outlet of the steam drum is connected with the saturated water inlet of the heat storage container through the water supply pump, and the hot water outlet of the heat storage container is connected with the hot water inlet of the flash tank; the saturated steam outlet of the flash tank is connected with the saturated steam inlet of the steam-water separator, and the heating saturated steam outlet of the steam-water separator is connected with the steam inlet of the steam turbine.
And a separation water outlet of the steam-water separator is connected with a reuse water inlet of the deoxidizing head.
And a flash water outlet of the flash tank is connected with a reuse water inlet of the deoxidizing head.
Compared with the prior art, the invention has the beneficial effects that:
1) The three states (melting, shelling and shelling) of the fused magnesium melt lump are respectively subjected to waste heat recovery by using three waste heat recovery devices, wherein the main bodies of the fused magnesium melt lump waste heat recovery chamber and the self-deoxidizing magnesium melt lump waste heat recovery chamber adopt annular waste heat recovery chambers, compared with the existing tunnel type waste heat recovery devices, the waste heat recovery efficiency is greatly improved, the heating surface is heated more uniformly, the steam-water fluidity is improved, the circulation rate of a steam-water system is improved, and therefore the heat transfer coefficient is greatly increased, and the waste heat recovery efficiency is improved;
2) The waste heat recovery chamber of the fused magnesium fused lump and the waste heat recovery chamber of the self-deoxidizing magnesium fused lump realize stable external steam supply through the heat storage container and the steam drum, so that the great fluctuation of heat recovery caused in the cycle process of adding, cooling, discharging and adding the fused magnesium fused lump is greatly reduced;
3) The saturated steam generated by the system is used for directly dragging a steam turbine to generate electricity.
Drawings
FIG. 1 is a process flow diagram of the method for utilizing the waste heat of the fused magnesium lump.
Fig. 2 is a schematic structural view of a molten magnesium lump waste heat recovery chamber according to the present invention.
Fig. 3 is a schematic structural diagram of the self-deoxidizing magnesium melting lump waste heat recovery chamber.
In the figure: 1 molten magnesium melting lump waste heat recovery chamber 2, broken shell magnesium melting lump waste heat recovery chamber 3, self-deoxidizing magnesium melting lump waste heat recovery chamber 4, inlet regulating valve 5, flash tank 6, steam-water separator 7, steam turbine 8, condenser 9, condensate pump 10, water feed pump 11, outlet regulating valve 12, inlet valve 13, bypass door 14, annular waste heat recovery chamber 15, heat storage container 16, water-cooled wall 17, deoxidizing head 18, down pipe 19, ascending pipe 20, molten magnesium melting lump 21, unshelling molten magnesium melting lump 22, unshelling molten magnesium melting lump 23, steam drum.
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, the method for utilizing the waste heat of the fused magnesium melting lump comprises the following steps:
1) The molten electric smelting magnesium smelting lump 20 is sequentially sent into a molten magnesium smelting lump waste heat recovery chamber 1, a broken-shell magnesium smelting lump waste heat recovery chamber 2 and a self-deoxidizing magnesium smelting lump waste heat recovery chamber 3 to respectively recover waste heat, and the electric smelting magnesium smelting lump after recovering the waste heat and cooling is sent to the next working procedure;
2) The condensed water of the steam turbine 7 below 40 ℃ is sent into a broken-shell magnesium melting lump waste heat recovery chamber 2, is heated to more than 80 ℃ after heat exchange with the electric melting magnesium melting lump 21 in the shelling process, and then is sent into a self-deoxidizing magnesium melting lump waste heat recovery chamber 3 to exchange heat with the electric melting magnesium melting lump 22 after shelling, and is heated to saturated water above 104 ℃;
3) The saturated water is sent into a molten magnesium melting lump waste heat recovery chamber 1 through a water feeding pump 10 to exchange heat with the freshly melted molten magnesium melting lump 1 to form hot water with the pressure of more than 2MPa and the temperature of 150-200 ℃, and then the hot water enters a flash tank 5 to generate saturated steam with the pressure of 0.5-1.8 MPa; the flash water flows back from the bottom of the flash tank 5 to the self-deoxidizing magnesium smelting lump waste heat recovery chamber 3 for recycling;
4) Saturated steam enters a steam-water separator 6, is subjected to steam-water separation and reheating and then enters a steam turbine 7 for power generation, and condensed water separated by the steam-water separator 6 flows back to a self-deoxidizing magnesium melting lump waste heat recovery chamber 3 for recycling; the steam discharged from the steam turbine 7 enters a condenser 8 for condensation, and then is sent into a broken-shell magnesium fused block waste heat recovery chamber 2 by a condensate pump 9 for recycling.
An inlet regulating valve 4 is arranged at the inlet of the flash tank 5 and used for controlling the pressure in the flash tank 5, and an outlet regulating valve 11 is arranged at the bottom of the flash tank 5 and used for controlling the water level in the flash tank 5 to be the running water level.
And a water supplementing port is arranged at the hot well of the condenser 8.
As shown in fig. 2, the main body of the molten magnesium melting lump waste heat recovery chamber 1 is an annular waste heat recovery chamber 14, and a water cooling wall 16 forms a closed annular space, and the annular space is a movable cooling channel of the electric melting magnesium melting lump; the top of the annular waste heat recovery chamber 14 is provided with a heat storage container 15, and the heat storage container 15 is connected with a water cooling wall 16 through a rising pipe 19 and a falling pipe 18.
As shown in fig. 3, the main body of the self-deoxidizing magnesium melting lump waste heat recovery chamber 3 is an annular waste heat recovery chamber 14, and a water cooling wall 16 forms a closed annular space, and the annular space is a movable cooling channel of the electric melting magnesium melting lump; the top of the annular waste heat recovery chamber is provided with a steam drum 23, the top of the steam drum 23 is provided with an oxygen removing head 17, and the steam drum 23 is connected with the water cooling wall 16 through a rising pipe 19 and a falling pipe 18.
The shell-broken magnesium fused lump waste heat recovery chamber 2 is a heat exchanger type waste heat recovery chamber.
The electric smelting magnesium smelting lump waste heat utilization system for realizing the method comprises a smelting magnesium smelting lump waste heat recovery chamber 1, a shell-broken magnesium smelting lump waste heat recovery chamber 2, a self-deoxidizing magnesium smelting lump waste heat recovery chamber 3, a flash tank 5, a steam-water separator 6, a steam turbine 7 and a condenser 8; the main bodies of the molten magnesium melting lump waste heat recovery chamber 1 and the self-deoxidizing magnesium melting lump waste heat recovery chamber 2 are annular waste heat recovery chambers 14, and a closed annular space is formed by water cooling walls 16 and is a movable cooling channel of the electric melting magnesium melting lump; a heat storage container 15 is arranged at the top of the annular waste heat recovery chamber 14 corresponding to the molten magnesium lump waste heat recovery chamber 1, and the heat storage container 15 is connected with a corresponding water-cooled wall 16 through a rising pipe 19 and a falling pipe 18; the top of the annular waste heat recovery chamber 14 corresponding to the self-deoxidizing magnesium melting lump waste heat recovery chamber 3 is provided with a steam drum 23, the top of the steam drum 23 is provided with a deoxidizing head 17, and the steam drum 23 is connected with the corresponding water-cooled wall 16 through a riser 19 and a downcomer 18; the shell-broken magnesium fused lump waste heat recovery chamber 2 is a heat exchanger type waste heat recovery chamber; the steam outlet of the steam turbine 7 is connected with the heat exchange water inlet of the broken-shell magnesium melting lump waste heat recovery chamber 2 through the condenser 8 and the condensate pump 9, and the heat exchange water outlet of the broken-shell magnesium melting lump waste heat recovery chamber 2 is connected with the water inlet on the deoxidizing head 17; the saturated water outlet of the steam drum 23 is connected with the saturated water inlet of the heat storage container 15 through the water feeding pump 10, and the hot water outlet of the heat storage container 15 is connected with the hot water inlet of the flash tank 5; the saturated steam outlet of the flash tank 5 is connected with the saturated steam inlet of the steam-water separator 6, and the heated saturated steam outlet of the steam-water separator 6 is connected with the steam inlet of the steam turbine 7.
The separation water outlet of the steam-water separator 6 is connected with the reuse water inlet of the deaeration head 17.
The flash water outlet of the flash tank 5 is connected with the reuse water inlet of the deaerating head 17.
The waste heat recovery devices 1, 2 and 3 need to be manually operated when being started in a cold state; the low-temperature water in the waste heat recovery device is gradually heated in the cooling and heat release process of the fused magnesium melt lump at the initial stage, the water supply pump 10 and the condensate pump 9 are started along with the rising of the water temperature, the inlet valve 12 of the steam turbine 7 is closed, and the bypass door 13 of the steam turbine 7 is opened, so that the primary water circulation is formed.
With the continuous rise of the water temperature and the proceeding of water circulation, the oxygen in the water can meet the equipment requirement, and when enough saturated steam can be generated in the steam-water separator 6, the inlet valve 12 of the steam turbine 7 is gradually opened for warming up. When the turbine 7 meets the condition of the flushing, the bypass door 13 of the turbine 7 is gradually closed, the unit is flushed, and when the flushing is successful and the load is applied, the unit can be automatically operated.
After automatic operation, the electric smelting magnesium melting lump enters into each waste heat recovery device for allocation according to the production flow of the electric smelting magnesium melting lump, the waste heat recovery quantity of each part is improved as much as possible through the regulation and control of cooling time, and meanwhile, the steam generation quantity is automatically controlled through controlling the pressure in the flash tank 5.
In order to stabilize the flow and pressure of steam, a plurality of waste heat recovery circuits are generally required to be configured, and the fused magnesium fused lump just fused in each waste heat recovery circuit is required to be fed in at staggered time, so that waste heat is jointly recovered in stages to generate steam.
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 (6)
1. The electric smelting magnesium melting lump waste heat utilization method is characterized by being realized based on an electric smelting magnesium melting lump waste heat utilization system; the electric smelting magnesium smelting lump waste heat utilization system comprises a smelting magnesium smelting lump waste heat recovery chamber, a shell breaking magnesium smelting lump waste heat recovery chamber, a self-deoxidizing magnesium smelting lump waste heat recovery chamber, a flash tank, a steam-water separator, a steam turbine and a condenser; the main bodies of the molten magnesium melting lump waste heat recovery chamber and the self-deoxidizing magnesium melting lump waste heat recovery chamber are annular waste heat recovery chambers, and a closed annular space is formed by water cooling walls and is a movable cooling channel of the electric melting magnesium melting lump; a heat storage container is arranged at the top of the annular waste heat recovery chamber corresponding to the molten magnesium lump waste heat recovery chamber, and the heat storage container is connected with a corresponding water-cooled wall through a rising pipe and a falling pipe; the top of the annular waste heat recovery chamber corresponding to the self-deoxidizing magnesium melting lump waste heat recovery chamber is provided with a steam drum, the top of the steam drum is provided with a deoxidizing head, and the steam drum is connected with a corresponding water-cooled wall through a rising pipe and a falling pipe; the shell-broken magnesium fused lump waste heat recovery chamber is a heat exchanger type waste heat recovery chamber; the steam outlet of the steam turbine is connected with a heat exchange water inlet of the broken-shell magnesium melting lump waste heat recovery chamber through a condenser and a condensate pump, and the heat exchange water outlet of the broken-shell magnesium melting lump waste heat recovery chamber is connected with a water inlet on the deaeration head; the saturated water outlet of the steam drum is connected with the saturated water inlet of the heat storage container through the water supply pump, and the hot water outlet of the heat storage container is connected with the hot water inlet of the flash tank; the saturated steam outlet of the flash tank is connected with the saturated steam inlet of the steam-water separator, and the heating saturated steam outlet of the steam-water separator is connected with the steam inlet of the steam turbine; the separation water outlet of the steam-water separator is connected with the reuse water inlet of the deaeration head; a flash water outlet of the flash tank is connected with a reuse water inlet of the deoxidizing head;
the method for utilizing the waste heat of the fused magnesium lump comprises the following steps:
1) The molten electric smelting magnesium melting lump is sequentially sent into a molten magnesium melting lump waste heat recovery chamber, a broken-shell magnesium melting lump waste heat recovery chamber and a self-deoxidizing magnesium melting lump waste heat recovery chamber to respectively recover waste heat, and the electric smelting magnesium melting lump after the waste heat recovery and cooling is sent to the next working procedure;
2) Delivering the turbine condensate below 40 ℃ into a broken-shell magnesium fused lump waste heat recovery chamber, exchanging heat with the unshelling fused magnesium fused lump, heating to more than 80 ℃, delivering the turbine condensate into a self-deoxidizing magnesium fused lump waste heat recovery chamber, exchanging heat with the unshelling fused magnesium fused lump, and heating to saturated water above 104 ℃;
3) The saturated water is pumped into a waste heat recovery chamber of the molten magnesium melting lump through a water supply pump to exchange heat with the freshly melted molten magnesium melting lump to form hot water with the pressure of more than 2MPa and the temperature of 150-200 ℃, and then enters a flash evaporation tank to generate saturated steam with the pressure of 0.5-1.8 MPa; the flash water flows back from the bottom of the flash tank to the self-deoxidizing magnesium smelting lump waste heat recovery chamber for recycling;
4) Saturated steam enters a steam-water separator, is subjected to steam-water separation and reheating, and then enters a steam turbine for power generation, and condensed water separated by the steam-water separator flows back to a self-deoxidizing magnesium melting lump waste heat recovery chamber for recycling; and the steam discharged from the steam turbine enters a condenser for condensation, and then is sent into a broken-shell magnesium melting lump waste heat recovery chamber by a condensate pump for recycling.
2. The method for utilizing waste heat of fused magnesium fused lump according to claim 1, wherein an inlet regulating valve is arranged at an inlet of the flash tank for controlling pressure in the flash tank, and an outlet regulating valve is arranged at the bottom of the flash tank for controlling water level in the flash tank to be operating water level.
3. The method for utilizing waste heat of the fused magnesium melting lump according to claim 1, wherein a water supplementing port is arranged at a hot well of the condenser.
4. The method for utilizing the waste heat of the fused magnesium melting lump according to claim 1, wherein the main body of the waste heat recovery chamber of the fused magnesium melting lump is an annular waste heat recovery chamber, a closed annular space is formed by water cooling walls, and the annular space is a movable cooling channel of the fused magnesium melting lump; the top of the annular waste heat recovery chamber is provided with a heat storage container which is connected with the water cooling wall through a rising pipe and a falling pipe.
5. The method for utilizing the waste heat of the fused magnesium melting lump according to claim 1, wherein the main body of the self-deoxidizing magnesium melting lump waste heat recovery chamber is an annular waste heat recovery chamber, a closed annular space is formed by water cooling walls, and the annular space is a movable cooling channel of the fused magnesium melting lump; the top of the annular waste heat recovery chamber is provided with a steam drum, the top of the steam drum is provided with an oxygen removing head, and the steam drum is connected with the water cooling wall through a rising pipe and a falling pipe.
6. The method for utilizing waste heat of an electric smelting magnesium smelting lump according to claim 1, wherein the broken-shell magnesium smelting lump waste heat recovery chamber is a heat exchanger type waste heat recovery chamber.
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