Magnesium reducing slag waste heat recovery system

Abstract

The utility model provides a magnesium reducing slag waste heat recovery system. The magnesium reducing slag waste heat recovery system comprises a rotary barrel, a fixed seat, a feeding pipe, a first cooling medium pipe and a second cooling medium pipe, a water-cooling interlayer is arranged on the outer side of an inner cavity of the rotating barrel, one end of the rotating barrel is a feeding end, the other end of the rotating barrel is a discharging end, and the feeding end is rotationally installed on the fixing base. The feeding pipe is arranged on the fixed seat, and the feeding pipe is communicated with the inner cavity of the rotary drum; the first cooling medium pipe is communicated with the water cooling interlayer and is communicated to the position, close to the feeding end, of the water cooling interlayer; the second cooling medium pipe is communicated with the water cooling interlayer and communicated to the position, close to the discharging end, of the water cooling interlayer. According to the magnesium reducing slag waste heat recovery system, continuous feeding can be achieved, the cooling efficiency is high, and waste heat of magnesium reducing slag can be effectively recovered.

Description

Technical Field

[0001] The utility model relates to the technical field of magnesium smelting equipment, in particular to a magnesium reduction slag waste heat recovery system. Background Art

[0002] During the magnesium smelting process, the temperature of magnesium reduction slag can be as high as 1200℃ when it comes out of the furnace. Since magnesium reduction slag can play a good heat insulation role after cooling and pulverization, the magnesium reduction slag piled in the yard is cooled on the surface, but the internal heat dissipation is very slow, and it will maintain a high temperature for a long time. The high temperature of magnesium reduction slag not only brings a lot of inconvenience to its subsequent processing, storage and transportation, but also wastes heat energy during natural cooling.

[0003] The cooling efficiency of the conventional cooling device for magnesium reduction slag is low, the efficiency of utilizing the waste heat of magnesium reduction slag is low, and continuous feeding cannot be achieved. Therefore, it is necessary to develop a magnesium reduction slag waste heat recovery system to achieve continuous feeding and rapid cooling of magnesium reduction slag, and to effectively recover and utilize the waste heat of magnesium reduction slag. Utility Model Content

[0004] Based on this, the utility model provides a magnesium reduction slag waste heat recovery system which can perform continuous feeding, has high cooling efficiency, and can effectively recover the waste heat of the magnesium reduction slag.

[0005] The technical solution proposed by the utility model is as follows:

[0006] According to a first aspect of the utility model, a magnesium reduction slag waste heat recovery system is provided, comprising a rotary barrel, a fixing seat, a feed pipe, a first cooling medium pipe and a second cooling medium pipe;

[0007] The outer side of the inner cavity of the rotary barrel is provided with a water-cooling interlayer, one end of the rotary barrel is a feed end, and the other end is a discharge end, and the feed end is rotatably mounted on the fixed seat;

[0008] The feed pipe is arranged on the fixing seat, and the feed pipe is communicated with the inner cavity of the rotating barrel;

[0009] The first cooling medium pipe is in communication with the water-cooling interlayer, and is in communication with a portion of the water-cooling interlayer close to the feed end;

[0010] The second cooling medium pipe is in communication with the water-cooling interlayer and is in communication with a portion of the water-cooling interlayer close to the discharge end.

[0011] In any embodiment, a fixing sleeve is provided on the fixing seat, and the fixing sleeve transversely penetrates the fixing seat; the first cooling medium pipe is passed through the fixing sleeve and can rotate in the fixing sleeve.

[0012] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a first valve and a second valve, wherein the first valve and the second valve are respectively arranged on the first cooling medium pipe and the second cooling medium pipe.

[0013] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a water supply pipeline and a first rotary seal joint; the first cooling medium pipe is connected to the water supply pipeline through the first rotary seal joint.

[0014] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a steam-water separation tank and a second rotary sealing joint, and the second cooling medium pipe is connected to the steam-water separation tank through the second rotary sealing joint.

[0015] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a water supply pipeline and a first rotary seal joint; the second cooling medium pipe is connected to the water supply pipeline through the first rotary seal joint.

[0016] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a steam-water separation tank and a second rotary sealing joint, and the first cooling medium pipe is connected to the steam-water separation tank through the second rotary sealing joint.

[0017] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a water inlet flow meter, and the water inlet flow meter is arranged on the water supply pipeline.

[0018] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a return water pipe, a return water pipeline pump and a return water flow meter;

[0019] One end of the water return pipe is in communication with the bottom of the inner cavity of the steam-water separation tank, and the other end is in communication with the water supply pipe;

[0020] The return water pipeline pump and the return water flow meter are both arranged on the return water pipe.

[0021] In any embodiment, the magnesium reduction slag waste heat recovery system further includes a slag discharge dust cover, and the slag discharge dust cover is arranged at the discharge end of the rotary barrel.

[0022] Compared with the prior art, the utility model has at least the following beneficial effects:

[0023] By using a rotary barrel with a water-cooled interlayer, one end of the rotary barrel is a feed end and the other end is a discharge end; the feed end of the rotary barrel is rotatably mounted on a fixed seat, and a feed pipe is arranged on the fixed seat to be connected to the inner cavity of the rotary barrel; the first cooling medium pipe is connected to the water-cooled interlayer near the feed end, and the second cooling medium pipe is connected to the water-cooled interlayer near the discharge end; the magnesium reduction slag to be cooled can be continuously introduced into the rotary barrel through the feed pipe on the fixed seat, so that the continuous feeding of the magnesium reduction slag can be realized; the magnesium reduction slag in the rotary barrel can be effectively cooled through the water-cooled interlayer and the connected first cooling medium pipe and second cooling medium pipe, and the waste heat of the magnesium reduction slag can be effectively recovered. The magnesium reduction slag waste heat recovery system can be continuously fed, has a high cooling efficiency, and can effectively recover the waste heat of the magnesium reduction slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to better describe and illustrate the embodiments or examples provided by the present utility model, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of the disclosed utility model, the embodiments or examples currently described, and any of the best modes of these utility models currently understood. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0025] Figure 1 This is a structural schematic diagram of a magnesium reduction slag waste heat recovery system according to an embodiment of the utility model;

[0026] Figure 2 This is a schematic structural diagram of a magnesium reduction slag waste heat recovery system according to another embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 100. Magnesium reduction slag waste heat recovery system; 101. Rotating barrel; 102. Fixed seat; 103. Feed pipe; 104. First cooling medium pipe; 105. Second cooling medium pipe; 106. First valve; 107. Second valve; 108. Water supply pipeline; 109. First rotary sealing joint; 110. Steam-water separation tank; 111. Second rotary sealing joint; 112. Water inlet flowmeter; 113. Return pipe; 114. Return pipe pump; 115. Return flowmeter; 116. Slag dust cover; 1011. Water-cooled interlayer; 1012. Feed end; 1013. Discharge end; 1021. Fixed sleeve. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] See also Figure 1 and Figure 2In one embodiment of the utility model, a magnesium reduction slag waste heat recovery system 100 is provided. The magnesium reduction slag waste heat recovery system 100 includes a rotary barrel 101, a fixing seat 102, a feed pipe 103, a first cooling medium pipe 104 and a second cooling medium pipe 105. Among them, a water-cooling interlayer 1011 is provided on the outer side of the inner cavity of the rotary barrel 101, one end of the rotary barrel 101 is a feed end 1012, and the other end is a discharge end 1013; the feed end 1012 of the rotary barrel 101 is rotatably mounted on the fixed seat 102; the feed pipe 103 is arranged on the fixed seat 102, and the feed pipe 103 is connected to the inner cavity of the rotary barrel 101; the first cooling medium pipe 104 is connected to the water-cooling interlayer 1011 of the rotary barrel 101, and is connected to the water-cooling interlayer 1011 near the feed end 1012; the second cooling medium pipe 105 is connected to the water-cooling interlayer 1011, and is connected to the water-cooling interlayer 1011 near the discharge end 1013.

[0034] The above-mentioned magnesium reduction slag waste heat recovery system 100 adopts a rotary barrel 101 with a water-cooled interlayer 1011, one end of the rotary barrel 101 is a feed end 1012, and the other end is a discharge end 1013; the feed end 1012 of the rotary barrel 101 is rotatably mounted on a fixed seat 102, and a feed pipe 103 is arranged on the fixed seat 102 to communicate with the inner cavity of the rotary barrel 101; and the first cooling medium pipe 104 is connected to the water-cooled interlayer 1011 near the feed end 1012 , connect the second cooling medium pipe 105 to the water-cooled interlayer 1011 near the discharge end 1013; the magnesium reduction slag to be cooled can be continuously introduced into the rotary barrel 101 through the feed pipe 103 on the fixed seat 102, so that the continuous feeding of the magnesium reduction slag can be realized; through the water-cooled interlayer 1011 and the connected first cooling medium pipe 104 and second cooling medium pipe 105, the magnesium reduction slag in the rotary barrel 101 can be effectively cooled, and the waste heat of the magnesium reduction slag can be effectively recovered. The magnesium reduction slag waste heat recovery system 100 can be continuously fed, has high cooling efficiency, and can effectively recover the waste heat of the magnesium reduction slag.

[0035] In some embodiments, a fixed sleeve 1021 is provided on the fixed seat 102, and the fixed sleeve 1021 horizontally penetrates the fixed seat 102; the first cooling medium pipe 104 is inserted into the fixed sleeve 1021 and can rotate in the fixed sleeve 1021. In this way, during the rotation of the rotary barrel 101, the first cooling medium pipe 104 can rotate synchronously in the fixed sleeve 1021, and the cooling medium can be continuously transported.

[0036] In some embodiments, the first cooling medium pipe 104 and the second cooling medium pipe 105 are both arranged along the transverse center axis of the rotary barrel 101 (eg, Figure 1 and Figure 2Thus, the first cooling medium pipe 104 and the second cooling medium pipe 105 can serve as the rotating shaft of the rotating barrel 101 and rotate synchronously with the rotating barrel 101.

[0037] In some embodiments, the magnesium reduction slag waste heat recovery system 100 further includes a first valve 106 and a second valve 107, which are respectively arranged on the first cooling medium pipe 104 and the second cooling medium pipe 105. By respectively arranging the first valve 106 and the second valve 107 on the first cooling medium pipe 104 and the second cooling medium pipe 105, the flow of the cooling medium flowing through the first cooling medium pipe 104 and the second cooling medium pipe 105 can be conveniently controlled.

[0038] See also Figure 1 In one embodiment, the magnesium reduction slag waste heat recovery system 100 further includes a water supply pipe 108 and a first rotary seal joint 109; the first cooling medium pipe 104 is connected to the water supply pipe 108 through the first rotary seal joint 109. In this way, the cooling medium (such as water) can be introduced from the feed end 1012 of the rotary barrel 101 into the water cooling interlayer 1011 through the water supply pipe 108 and the first cooling medium pipe 104.

[0039] See also Figure 1 In one embodiment, the magnesium reduction slag waste heat recovery system 100 further includes a steam-water separation tank 110 and a second rotary seal joint 111; the second cooling medium pipe 105 is connected to the steam-water separation tank 110 through the second rotary seal joint 111. In this way, the cooling water enters the first cooling medium pipe 104 near the feeding end 1012 of the water-cooled interlayer 1011, absorbs the heat of the magnesium reduction slag and turns into water vapor, flows out from the second cooling medium pipe 105 near the discharging end 1013 of the water-cooled interlayer 1011, and enters the steam-water separation tank 110. The water vapor in the steam-water separation tank 110 can be used in places where steam is needed (such as steam jet vacuum pumps).

[0040] See also Figure 2 In one embodiment, the magnesium reduction slag waste heat recovery system 100 further includes a water supply pipe 108 and a first rotary seal joint 109; the second cooling medium pipe 105 is connected to the water supply pipe 108 through the first rotary seal joint 109. In this way, the cooling medium can be introduced into the water cooling interlayer 1011 from the discharge end 1013 of the rotary barrel 101 through the water supply pipe 108 and the second cooling medium pipe 105.

[0041] See also Figure 2In one embodiment, the magnesium reduction slag waste heat recovery system 100 further includes a steam-water separation tank 110 and a second rotary seal joint 111; the first cooling medium pipe 104 is connected to the steam-water separation tank 110 through the second rotary seal joint 111. In this way, the cooling water enters the second cooling medium pipe 105 near the discharge end 1013 of the water-cooled interlayer 1011, absorbs the heat of the magnesium reduction slag and turns into water vapor, flows out from the first cooling medium pipe 104 near the feed end 1012 of the water-cooled interlayer 1011, and enters the steam-water separation tank 110. The water vapor in the steam-water separation tank 110 can be used in places where steam is needed.

[0042] Understandably, Figure 1 The magnesium reduction slag waste heat recovery system 100 and Figure 2 The main difference of the magnesium reduction slag waste heat recovery system 100 shown is that the connection methods of the water supply pipe 108, the steam-water separation tank 110 and the first cooling medium pipe 104 and the second cooling medium pipe 105 are different; accordingly, the flow direction of the cooling medium in the water-cooled interlayer 1011 is different.

[0043] like Figure 1 In the magnesium reduction slag waste heat recovery system 100 shown, the water supply pipe 108 is connected to the first cooling medium pipe 104, the steam-water separation tank 110 is connected to the second cooling medium pipe 105, and the cooling medium flows from the feed end 1012 of the rotary barrel 101 to the discharge end 1013 in the water-cooled interlayer 1011; the flow direction of the cooling medium is consistent with the slag discharge direction, that is, the cooling medium adopts a downstream manner. Figure 2 In the magnesium reduction slag waste heat recovery system 100 shown, the water supply pipe 108 is connected to the second cooling medium pipe 105, the steam-water separation tank 110 is connected to the first cooling medium pipe 104, and the cooling medium flows from the discharge end 1013 of the rotary barrel 101 to the feed end 1012 in the water-cooled interlayer 1011; the flow direction of the cooling medium is opposite to the slag discharge direction, that is, the cooling medium adopts a countercurrent method.

[0044] In some embodiments, the magnesium reduction slag waste heat recovery system 100 further includes a water inlet flow meter 112, which is disposed on the water supply pipe 108. By disposing the water inlet flow meter 112 on the water supply pipe 108, the flow rate of the cooling medium entering the water-cooled interlayer 1011 can be conveniently obtained.

[0045] In some embodiments, the magnesium reduction slag waste heat recovery system 100 further includes a return water pipe 113, a return water pipeline pump 114 and a return water flow meter 115; one end of the return water pipe 113 is connected to the bottom of the inner cavity of the steam-water separation tank 110, and the other end is connected to the water supply pipe 108; the return water pipeline pump 114 and the return water flow meter 115 are both arranged on the return water pipe 113. By arranging the return water pipe 113 between the steam-water separation tank 110 and the water supply pipe 108 for communication, the cooling water at the bottom of the steam-water separation tank 110 can be transported to the water supply pipe 108 through the return water pipe 113 through the return water pipeline pump 114 for reuse. The return water flow can be conveniently monitored by the return water flow meter 115.

[0046] In some of the embodiments, a liquid level meter (not shown) is provided in the steam-water separation tank 110, and the liquid level meter is used to detect the liquid level height in the steam-water separation tank 110, and can send upper and lower limit liquid level signals; the water inlet flow rate of the water-cooling interlayer 1011 can be adjusted according to the liquid level signal in the steam-water separation tank 110 detected by the liquid level meter.

[0047] In some embodiments, the magnesium reduction slag waste heat recovery system 100 further includes a slag dust cover 116, which is provided at the discharge end 1013 of the rotary barrel 101. By providing the slag dust cover 116 at the discharge end 1013 of the rotary barrel 101, the slag dust cover 116 covers the discharge port of the rotary barrel 101 during the process of recovering waste heat from the magnesium reduction slag, thereby reducing dust during the cooling process of the magnesium reduction slag and improving the process environment for recovering waste heat from the magnesium reduction slag.

[0048] like Figure 1 The working process of the magnesium reduction slag waste heat recovery system 100 of the illustrated embodiment is as follows:

[0049] The high-temperature magnesium reduction slag coming out of the discharge port of the magnesium reduction tank enters the feed end 1012 of the rotary barrel 101 through the feed pipe 103; the cooling water enters the water-cooling interlayer 1011 through the water supply pipe 108 via the first cooling medium pipe 104; during the rotation of the rotary barrel 101, the heat of the magnesium reduction slag is recovered by the cooling water in the water-cooling interlayer 1011 and the magnesium reduction slag is cooled; the cooling water and water vapor after absorbing the residual heat of the magnesium reduction slag enter the steam-water separation tank 110 from the second cooling medium pipe 105; the water vapor in the steam-water separation tank 110 is discharged through the steam outlet at the top and can be used by the heat user, and the water at the bottom of the steam-water separation tank 110 is passed into the water supply pipe 108 by the return pipe 113 through the return pipe pump 114 for recycling; the magnesium reduction slag is discharged from the discharge end 1013 of the rotary barrel 101 after cooling, and can be transported to the slag storage tank for storage.

[0050] The liquid level gauge in the steam-water separation tank 110 can send out upper and lower limit liquid level signals, which can be used to control the water inlet flow rate of the water-cooled interlayer 1011; the water inlet flow rate of the rotating barrel 101 is detected by the water inlet flow meter 112, and the system can use high and low two-position control for the water inlet flow rate, and the high (low) position flow rate is respectively greater than (less than) the evaporation rate of the cooling water in the water-cooled interlayer 1011; the return pipe pump 114 can return the water at the bottom of the steam-water separation tank 110 to the water-cooled interlayer 1011 at a constant flow rate (the sum of this flow rate and the low-position control flow rate of the new water inlet must be greater than the evaporation rate of the cooling water).

[0051] like Figure 2 The working process of the magnesium reduction slag waste heat recovery system 100 of the illustrated embodiment is as follows:

[0052] The high-temperature magnesium reduction slag coming out of the discharge port of the magnesium reduction tank enters the feed end 1012 of the rotary barrel 101 through the feed pipe 103; the cooling water enters the water-cooling interlayer 1011 through the water supply pipe 108 via the second cooling medium pipe 105; during the rotation of the rotary barrel 101, the heat of the magnesium reduction slag is recovered by the cooling water in the water-cooling interlayer 1011 and the magnesium reduction slag is cooled; the cooling water and water vapor after absorbing the residual heat of the magnesium reduction slag enter the steam-water separation tank 110 from the first cooling medium pipe 104; the water vapor in the steam-water separation tank 110 is discharged through the steam outlet at the top and can be used by the heat user, and the water at the bottom of the steam-water separation tank 110 is passed from the return pipe pump 114 to the water supply pipe 108 via the return pipe 113 for recycling; the magnesium reduction slag is discharged from the discharge end 1013 of the rotary barrel 101 after cooling, and can be transported to the slag storage tank for storage.

[0053] Similarly, the liquid level gauge in the steam-water separation tank 110 can send out upper and lower limit liquid level signals, which can be used to control the water inlet flow rate of the water-cooled interlayer 1011; the water inlet flow rate of the rotating barrel 101 is detected by the water inlet flow meter 112, and the system can use high and low two-position control for the water inlet flow rate, and the high (low) position flow rate is respectively greater than (less than) the evaporation rate of the cooling water in the water-cooled interlayer 1011; the return pipe pump 114 can return the water at the bottom of the steam-water separation tank 110 to the water-cooled interlayer 1011 at a constant flow rate (the sum of this flow rate and the low-position control flow rate of the new water inlet must be greater than the evaporation rate of the cooling water).

[0054] The magnesium reduction slag waste heat recovery system 100 of the utility model is used to recover the waste heat of the magnesium reduction slag. Based on the calculation that 5.5 tons of magnesium reduction slag is discharged per ton of magnesium and the magnesium reduction slag is cooled from 900°C to 200°C, the heat released is theoretically calculated to be about 3.985MJ (0.136tce). According to the waste heat recovery efficiency of 90%, the waste heat recovered from the magnesium reduction slag produced per ton of magnesium can produce about 1.35 tons of 0.6MPa pressure steam. If an ordinary coal-fired steam boiler is used to produce steam, its thermal efficiency is only about 70%, and 204kg of coal fuel with a calorific value of 6000kcal / kg is required. Calculated at a coal price of 600 yuan / t, it is equivalent to saving 122 yuan in fuel cost per ton of magnesium. For a magnesium smelter with a capacity of 10,000 tons, 1.22 million yuan in fuel costs can be saved each year, with significant economic benefits. At the same time, waste heat recovery reduces coal-fired flue gas emissions and has significant environmental benefits.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims, and the description and drawings can be used to explain the content of the claims.

Claims

1. A magnesium reduction slag waste heat recovery system, characterized in that: It includes a rotating barrel, a fixing seat, a feeding pipe, a first cooling medium pipe and a second cooling medium pipe; The outer side of the inner cavity of the rotary barrel is provided with a water-cooling interlayer, one end of the rotary barrel is a feed end, and the other end is a discharge end, and the feed end is rotatably mounted on the fixed seat; The feed pipe is arranged on the fixing seat, and the feed pipe is communicated with the inner cavity of the rotating barrel; The first cooling medium pipe is in communication with the water-cooling interlayer, and is in communication with a portion of the water-cooling interlayer close to the feed end; The second cooling medium pipe is in communication with the water-cooling interlayer and is in communication with a portion of the water-cooling interlayer close to the discharge end.

2. The magnesium reduction slag waste heat recovery system according to claim 1, characterized in that: The fixing seat is provided with a fixing sleeve, and the fixing sleeve passes through the fixing seat transversely; the first cooling medium pipe is passed through the fixing sleeve and can rotate in the fixing sleeve.

3. The magnesium reduction slag waste heat recovery system according to claim 1, characterized in that: The magnesium reduction slag waste heat recovery system further includes a first valve and a second valve, wherein the first valve and the second valve are respectively arranged on the first cooling medium pipe and the second cooling medium pipe.

4. The magnesium reduction slag waste heat recovery system according to any one of claims 1 to 3, characterized in that: The magnesium reduction slag waste heat recovery system also includes a water supply pipeline and a first rotary seal joint; the first cooling medium pipe is connected to the water supply pipeline through the first rotary seal joint.

5. The magnesium reduction slag waste heat recovery system according to claim 4, characterized in that: The magnesium reduction slag waste heat recovery system also includes a steam-water separation tank and a second rotary sealing joint, and the second cooling medium pipe is connected to the steam-water separation tank through the second rotary sealing joint.

6. The magnesium reduction slag waste heat recovery system according to any one of claims 1 to 3, characterized in that: The magnesium reduction slag waste heat recovery system also includes a water supply pipeline and a first rotary seal joint; the second cooling medium pipe is connected to the water supply pipeline through the first rotary seal joint.

7. The magnesium reduction slag waste heat recovery system according to claim 6, characterized in that: The magnesium reduction slag waste heat recovery system also includes a steam-water separation tank and a second rotary sealing joint, and the first cooling medium pipe is connected to the steam-water separation tank through the second rotary sealing joint.

8. The magnesium reduction slag waste heat recovery system according to claim 5 or 7, characterized in that: The magnesium reduction slag waste heat recovery system also includes a water inlet flow meter, which is arranged on the water supply pipeline.

9. The magnesium reduction slag waste heat recovery system according to claim 5 or 7, characterized in that: The magnesium reduction slag waste heat recovery system also includes a return water pipe, a return water pipeline pump and a return water flow meter; One end of the water return pipe is connected to the bottom of the inner cavity of the steam-water separation tank, and the other end is connected to the water supply pipe; The return water pipeline pump and the return water flow meter are both arranged on the return water pipe.

10. The magnesium reduction slag waste heat recovery system according to any one of claims 1 to 3, 5 and 7, characterized in that: The magnesium reduction slag waste heat recovery system also includes a slag discharge dust cover, which is arranged at the discharge end of the rotary barrel.

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