Tail gas purification device for smelting metal waste slag in direct-current plasma furnace

Abstract

The invention relates to the technical field of tail gas purification, and discloses a tail gas purification device for smelting metal waste slag in a direct current plasma furnace, the tail gas purification device comprises an equipment base, vertical plates are fixedly mounted on the left side and the right side of the upper end face of the equipment base, and a heat exchange cylinder is arranged between the vertical plates on the left side and the right side; a water outlet cover is fixedly installed on the left side of the side wall of the heat exchange cylinder, a water inlet cover is fixedly installed on the right side of the side wall of the heat exchange cylinder, supports are fixedly installed on the left side and the right side of the side wall of an inner cavity of the heat exchange cylinder, and the stirring mechanism is arranged in the inner cavity of the heat exchange cylinder; the descaling mechanism is arranged on the side wall of the water inlet cover; and the rotating mechanism is arranged on the side wall of the water outlet cover. Water can be guided from the water inlet cover, water can be discharged from the water outlet cover, heat exchange of high-temperature waste gas in the heat exchange coil pipe is achieved, meanwhile, the descaling mechanism and the stirring mechanism are additionally arranged, the water quality of clear water can be improved, and the function that the whole equipment well purifies the waste gas is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas purification, and particularly to a tail gas purification device for smelting metal waste slag by a DC plasma furnace. Background Art

[0002] The application of plasma technology in metallurgy can be traced back to the mid-18th century. Kinnersley et al. melted metals with electric sparks. In 1878, Siemens in France invented a DC arc furnace with a water-cooled bottom anode and a DC arc furnace with a horizontal non-transferred arc. The latter is the prototype of the modern plasma smelting furnace. Plasma smelting is mainly based on the ultra-high temperature of the plasma and can effectively control the atmosphere in the furnace according to different needs to realize the smelting of special metals or alloys. Sometimes, a water-cooled crystallizer can also be used to make the metal or alloy solidify sequentially to obtain an ingot with high-quality crystalline structure.

[0003] When the plasma furnace smelts metals, the heated raw materials (such as ores, metals, glass raw materials, ceramic raw materials, etc.) will decompose or volatilize at high temperatures, releasing various gases and vapors. For example, some ores contain elements such as sulfur and carbon, which will generate sulfur dioxide, carbon monoxide, etc. during the smelting process. The waste gas usually has a high temperature. Directly discharging it outdoors will cause waste of heat resources. If the heat of the waste gas is exchanged by heat exchange with clean water, a large amount of scale will be contained in the heated clean water, and sticking to the pipe wall may reduce the heat exchange efficiency of the waste gas. Therefore, there is an urgent need for a tail gas purification device for smelting metal waste slag by a DC plasma furnace to solve such problems. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The purpose of the present invention is to provide a tail gas purification device for smelting metal waste slag by a DC plasma furnace to solve the problem of heat loss in the waste gas caused by the tail gas purification device in the above background art.

[0006] (II) Technical Solutions

[0007] To achieve the above purpose, the present invention provides the following technical solution: A tail gas purification device for smelting metal waste slag by a DC plasma furnace, including an equipment base. On the upper end surface of the equipment base, vertical plates are fixedly installed on the left and right sides. Between the vertical plates on the left and right sides, a heat exchange cylinder is arranged. On the left side wall of the heat exchange cylinder, a water outlet cover is fixedly installed. On the right side wall of the heat exchange cylinder, a water inlet cover is fixedly installed. On the left and right sides of the inner cavity side wall of the heat exchange cylinder, brackets are fixedly installed. In the inner cavities of the brackets on the left and right sides, a reciprocating threaded groove rod is rotatably installed. A heat exchange coil pipe is wound and installed on the outer side wall of the heat exchange cylinder. It further includes:

[0008] A stirring mechanism, which is arranged in the inner cavity of the heat exchange cylinder and is used for mixing the clean water in the heat exchange cylinder;

[0009] A descaling mechanism, the descaling mechanism is arranged on the side wall of the water inlet cover, and the descaling mechanism is used for cleaning the scale on the inner wall of the heat exchange cylinder;

[0010] A rotating mechanism, the rotating mechanism is arranged on the side wall of the water outlet cover, and the rotating mechanism is used for rotating the heat exchange cylinder.

[0011] Preferably, the stirring mechanism includes a limiting rod fixedly installed on the side wall of the bracket, and a sliding disk slidably installed on the side wall of the limiting rod. A positioning seat is slidably installed on the side wall of the sliding disk, a mixing plate is fixedly installed on the side wall of the positioning seat, and a guide vane is fixedly installed on the left end surface of the reciprocating threaded groove rod.

[0012] Preferably, three groups of the limiting rods are equidistantly arranged along the axial direction of the sliding disk. A stepped groove is formed on the side wall of the sliding disk, and the positioning seat slides in the inner cavity of the stepped groove. A plurality of groups of the positioning seats are annularly and equidistantly arranged on the side wall of the sliding disk. A positioning ring is fixedly installed in the inner cavity of each group of the positioning seats. Mixing holes are formed on the side wall of the mixing plate, and the mixing plate is inclined on the side wall of the positioning seat.

[0013] Preferably, a limiting block is slidably installed in the inner cavity of the threaded groove wall of the reciprocating threaded groove rod, and the limiting block is fixedly installed on the inner side wall of the sliding disk. The guide vane is arranged in the inner cavity of the water outlet cover, and a water inlet pipe is fixedly installed on the side wall of the water inlet cover.

[0014] Preferably, the descaling mechanism includes an extension rod fixedly installed on the right end surface of the reciprocating threaded groove rod. A cam block is fixedly installed on the side wall of the extension rod. A piston box is fixedly installed on the side wall of the right-side vertical plate. A piston plate is slidably installed in the inner cavity of the piston box. A top rod is fixedly installed on the upper end surface of the piston plate, and a return spring is wound and installed on the side wall of the top rod.

[0015] Preferably, the top rod is slidably connected with the piston box, the side wall of the top rod abuts against the side wall of the cam block, both ends of the return spring are respectively fixed on the side wall of the piston plate and the inner wall of the piston box, and a liquid inlet ring is rotatably installed on the right side of the side wall of the water inlet cover. A water storage box is fixedly installed on the side wall of the right-side vertical plate.

[0016] Preferably, a water inlet rod is fixedly installed at the lower part of the side wall of the piston box, a water outlet rod is fixedly installed on the left side of the side wall of the piston box. A one-way water valve with an outlet towards the inner cavity of the piston box is arranged in the inner cavity of the water inlet rod, and a one-way water valve with an outlet towards the inner cavity of the liquid inlet ring is arranged in the inner cavity of the water outlet rod. A water inlet hole is formed on the side wall of the water inlet cover, and the water inlet hole is located in the inner cavity of the liquid inlet ring.

[0017] Preferably, the rotating mechanism includes a driving worm gear fixedly installed on the side wall of the water outlet cover, and a mounting plate fixedly installed on the side wall of the left vertical plate. A driving worm is rotatably installed in the inner cavity of the mounting plate, and a driving motor is fixedly installed on the side wall of the left vertical plate through a frame.

[0018] Preferably, the driving worm gear is meshed with the driving worm, and the output shaft end of the driving motor is fixedly connected to the driving worm.

[0019] Preferably, a filter plate is detachably installed at the barrel opening of the heat exchange coil, and the inner cavity of the heat exchange coil is filled with one or a combination of activated carbon particles and calcium oxide particles.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In this invention, the user can introduce water through the water inlet pipe, so that the clear water enters the water inlet cover and then enters the heat exchange cylinder, and finally is discharged from the water outlet cover. At this time, the clear water realizes the flow from right to left. At the same time, high-temperature waste gas is introduced from the left end of the heat exchange coil, and low-temperature waste gas is discharged from the right end of the heat exchange coil. At this time, the waste gas will realize the flow from left to right. Thus, through the above description, this device can continuously absorb and convert the high-temperature heat in the waste gas, avoiding the waste of thermal energy and improving the environmental protection of the whole device. By filling the inner cavity of the heat exchange coil with one or a combination of activated carbon particles and calcium oxide particles, when the high-temperature waste gas enters the heat exchange coil, the activated carbon particles and calcium oxide particles can effectively absorb the toxic and harmful gases in the relatively low-temperature waste gas, avoiding the pollution of the external air caused by the direct discharge of the waste gas.

[0022] 2. In this invention, when the clear water continuously moves from right to left, the flow of the water body can drive the guide impeller to make the reciprocating threaded rod rotate. Through the limiting block slidably installed in the inner cavity of the thread groove wall of the reciprocating threaded rod, under the limiting action of the three limiting rods on the sliding disk, at this time, the sliding disk will move left and right on the side wall of the reciprocating threaded rod. And because the mixing plate is inclined on the side wall of the positioning seat, at this time, the mixing plate can continuously rotate with the flow of the water, and cooperate with the mixing holes opened on the side wall of the mixing plate to realize the stirring and mixing of the water body, and impact and shed the loose water scale adhered to the inner wall of the heat exchange cylinder, ensuring the good heat exchange effect of the whole device on the high-temperature waste gas. Description of the Drawings

[0023] Figure 1 It is a front view overall structure schematic diagram of a tail gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0024] Figure 2 It is a rear view overall structure schematic diagram of a tail gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0025] Figure 3 It is a schematic top - view partial - sectional structure diagram of an exhaust gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0026] Figure 4 It is a schematic connection structure diagram at the rotating mechanism of an exhaust gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0027] Figure 5 It is a schematic connection structure diagram at the stirring mechanism of an exhaust gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0028] Figure 6 It is a schematic display structure diagram at the sliding disk of an exhaust gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0029] Figure 7 It is a schematic sectional structure diagram at the liquid - inlet ring of an exhaust gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention;

[0030] Figure 8 It is a schematic sectional structure diagram at the heat - exchange coiled pipe of an exhaust gas purification device for melting metal waste residue by a DC plasma furnace according to the present invention.

[0031] In the figure: 1. Equipment base; 2. Vertical plate; 3. Heat - exchange cylinder; 31. Water - outlet cover; 32. Water - inlet cover; 321. Water - inlet pipe; 322. Water - inlet hole; 4. Support; 5. Reciprocating threaded - groove rod; 51. Limit block; 6. Heat - exchange coiled pipe; 61. Filter plate; 7. Stirring mechanism; 71. Limit rod; 72. Sliding disk; 721. Step - groove; 73. Positioning seat; 731. Positioning ring; 74. Mixing plate; 741. Mixing hole; 75. Flow - guiding impeller; 8. Descaling mechanism; 81. Extension rod; 82. Cam block; 83. Piston box; 84. Piston plate; 85. Thrust rod; 86. Return spring; 87. Liquid - inlet ring; 88. Water - storage box; 871. Water - outlet rod; 881. Water - inlet rod; 9. Rotating mechanism; 91. Driving worm gear; 92. Installation plate; 93. Driving worm; 94. Driving motor. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] Please refer to Figures 1-8 , the present invention provides a technical solution for an exhaust gas purification device for melting metal waste residue by a DC plasma furnace:

[0034] A tail gas purification device for smelting metal waste slag by a DC plasma furnace, comprising an equipment base 1. On the left and right sides of the upper end surface of the equipment base 1, vertical plates 2 are fixedly installed. Between the left and right vertical plates 2, a heat exchange cylinder 3 is arranged. On the left side wall of the heat exchange cylinder 3, a water outlet cover 31 is fixedly installed. On the right side wall of the heat exchange cylinder 3, a water inlet cover 32 is fixedly installed. On the left and right sides of the inner cavity side wall of the heat exchange cylinder 3, brackets 4 are fixedly installed. In the inner cavities of the left and right brackets 4, a reciprocating threaded groove rod 5 is rotatably installed. A heat exchange coil 6 is wound and installed on the outer side wall of the heat exchange cylinder 3. It further includes:

[0035] A stirring mechanism 7, which is arranged in the inner cavity of the heat exchange cylinder 3 and is used for mixing the clear water in the heat exchange cylinder 3;

[0036] A descaling mechanism 8, which is arranged on the side wall of the water inlet cover 32 and is used for cleaning the water scale on the inner wall of the heat exchange cylinder 3;

[0037] A rotating mechanism 9, which is arranged on the side wall of the water outlet cover 31 and is used for rotating the heat exchange cylinder 3.

[0038] Furthermore, the stirring mechanism 7 includes a limiting rod 71 fixedly installed on the side wall of the bracket 4, and a sliding disk 72 slidably installed on the side wall of the limiting rod 71. A positioning seat 73 is slidably installed on the side wall of the sliding disk 72. A mixing plate 74 is fixedly installed on the side wall of the positioning seat 73. The left end face of the reciprocating threaded groove rod 5 is fixedly installed with a guide impeller 75;

[0039] Three groups of limiting rods 71 are equidistantly arranged along the axis of the sliding disk 72. A stepped groove 721 is opened on the side wall of the sliding disk 72. The positioning seat 73 slides in the inner cavity of the stepped groove 721. A number of groups of positioning seats 73 are annularly and equidistantly arranged on the side wall of the sliding disk 72. A positioning ring 731 is fixedly installed in the inner cavity of each group of positioning seats 73. Mixing holes 741 are opened on the side wall of the mixing plate 74;

[0040] A limiting block 51 is slidably installed in the inner cavity of the threaded groove wall of the reciprocating threaded groove rod 5. The limiting block 51 is fixedly installed on the inner side wall of the sliding disk 72. The guide impeller 75 is arranged in the inner cavity of the water outlet cover 31. A water inlet pipe 321 is fixedly installed on the side wall of the water inlet cover 32. The mixing plate 74 is inclined on the side wall of the positioning seat 73.

[0041] It should be noted that when the clear water continuously moves from right to left, the flow of the water body can drive the guide impeller 75 to rotate the reciprocating threaded groove rod 5. Through the limiting block 51 slidably installed in the inner cavity of the threaded groove wall of the reciprocating threaded groove rod 5, under the limiting action of the three limiting rods 71 on the sliding disk 72, at this time, the sliding disk 72 will move left and right on the side wall of the reciprocating threaded groove rod 5. Since the mixing plate 74 is inclined on the side wall of the positioning seat 73, at this time, the mixing plate 74 can continuously rotate with the flow of the water, and cooperate with the mixing holes 741 opened on the side wall of the mixing plate 74 to stir and mix the water body, impact and shed the loose water scale adhering to the inner wall of the heat exchange cylinder 3, ensuring the heat exchange effect of the entire device on the high-temperature waste gas.

[0042] Furthermore, the descaling mechanism 8 includes an extension rod 81 fixedly installed on the right end face of the reciprocating threaded groove rod 5. A cam block 82 is fixedly installed on the side wall of the extension rod 81. A piston box 83 is fixedly installed on the side wall of the right vertical plate 2. A piston plate 84 is slidably installed in the inner cavity of the piston box 83. A push rod 85 is fixedly installed on the upper end face of the piston plate 84. A return spring 86 is wound and installed on the side wall of the push rod 85;

[0043] The push rod 85 is slidably connected to the piston box 83. The side wall of the push rod 85 is in contact with the side wall of the cam block 82. The two ends of the return spring 86 are respectively fixed on the side wall of the piston plate 84 and the inner wall of the piston box 83. A liquid inlet ring 87 is rotatably installed on the right side wall of the water inlet cover 32. A water storage box 88 is fixedly installed on the side wall of the right vertical plate 2;

[0044] A water inlet rod 881 is fixedly installed on the lower part of the side wall of the piston box 83. A water outlet rod 871 is fixedly installed on the left side wall of the piston box 83. A one-way water valve with an outlet towards the inner cavity of the piston box 83 is arranged in the inner cavity of the water inlet rod 881. A one-way water valve with an outlet towards the inner cavity of the liquid inlet ring 87 is arranged in the inner cavity of the water outlet rod 871. A water inlet hole 322 is opened on the side wall of the water inlet cover 32, and the water inlet hole 322 is located in the inner cavity of the liquid inlet ring 87.

[0045] It should be noted that when the reciprocating threaded groove rod 5 rotates, the reciprocating threaded groove rod 5 can drive the extension rod 81 to rotate the cam block 82. Since the side wall of the ejector rod 85 abuts against the side wall of the cam block 82, the cam block 82 will continuously squeeze the piston plate 84 to move up and down in the inner cavity of the piston box 83. When the piston box 83 moves downward in the inner cavity of the piston box 83, the pressure of the sodium bicarbonate solution in the lower cavity of the piston box 83 will continuously increase. The sodium bicarbonate solution in the piston box 83 will enter the liquid inlet ring 87 through the water outlet rod 871. Then, the sodium bicarbonate solution in the liquid inlet ring 87 will enter the heat exchange cylinder 3 through the water inlet cover 32. Along with the continuous mixing of the sodium bicarbonate solution with the agitated sodium bicarbonate solution, the cleaning effect of the flowing water on the scale adhering to the inner wall of the heat exchange cylinder 3 is further improved, thereby greatly enhancing the purification effect of the entire device on the waste gas.

[0046] Furthermore, the rotating mechanism 9 includes a driving worm gear 91 fixedly installed on the side wall of the water outlet cover 31, and a mounting plate 92 fixedly installed on the side wall of the left vertical plate 2. A driving worm 93 is rotatably installed in the inner cavity of the mounting plate 92. A driving motor 94 is fixedly installed on the side wall of the left vertical plate 2 through a frame.

[0047] The driving worm gear 91 is meshed with the driving worm 93. The output shaft end of the driving motor 94 is fixedly connected to the driving worm 93. A filter plate 61 is detachably installed at the barrel opening of the heat exchange coil 6. The inner cavity of the heat exchange coil 6 is filled with one or a combination of activated carbon particles and calcium oxide particles.

[0048] It should be noted that the user can introduce water through the water inlet pipe 321, so that the clean water enters the water inlet cover 32 and then enters the heat exchange cylinder 3, and finally discharges from the water outlet cover 31. At this time, the clean water realizes the flow from right to left. At the same time, high-temperature waste gas is introduced from the left end of the heat exchange coil 6, and low-temperature waste gas is discharged from the right end of the heat exchange coil 6. At this time, the waste gas will realize the flow from left to right. Thus, through the above description, the device can continuously absorb and convert the high-temperature heat in the waste gas, avoiding the waste of heat energy and improving the environmental protection of the entire device. Through the inner cavity of the heat exchange coil 6 filled with one or a combination of activated carbon particles and calcium oxide particles, when the high-temperature waste gas enters the heat exchange coil 6, the activated carbon particles and calcium oxide particles can effectively absorb the toxic and harmful gases in the relatively low-temperature waste gas, avoiding the pollution of the external air caused by the direct discharge of the waste gas.

[0049] Working principle:

[0050] When the entire device is in use, the user can introduce water through the water inlet pipe 321, so that the clear water enters the water inlet cover 32 and then enters the heat exchange cylinder 3, and finally is discharged from the water outlet cover 31. At this time, the clear water realizes the flow from right to left. At the same time, high-temperature waste gas is introduced from the left end of the heat exchange coil 6, and low-temperature waste gas is discharged from the right end of the heat exchange coil 6. At this time, the waste gas will realize the flow from left to right. Therefore, through the above description, the device can continuously absorb and convert the high-temperature heat in the waste gas, avoid the waste of thermal energy, and improve the environmental protection of the entire device. The inner cavity of the heat exchange coil 6 is filled with one or a combination of activated carbon particles and calcium oxide particles. When the high-temperature waste gas enters the heat exchange coil 6, the activated carbon particles and calcium oxide particles can effectively absorb the toxic and harmful gases in the relatively low-temperature waste gas, avoiding the pollution of the external air caused by the direct discharge of the waste gas. During the continuous purification of the waste gas, the user can start the driving motor 94 to operate to rotate the driving worm 93. Through the meshing connection between the driving worm wheel 91 and the driving worm 93, at this time, the driving worm 93 will drive the driving worm wheel 91 to rotate the water outlet cover 31. By controlling the continuous forward and reverse rotation of the driving motor 94 (each rotation amplitude does not exceed 360°), the activated carbon particles and calcium oxide particles in the inner cavity of the heat exchange coil 6 can be mixed to increase the effective area of contact between the activated carbon particles, calcium oxide particles and the waste gas, ensuring the good effect of the entire device in purifying the waste gas;

[0051] It should be noted that when the clear water continuously moves from right to left, the flow of the water body can drive the guide impeller 75 to rotate the reciprocating threaded groove rod 5. Through the limit block 51 slidably installed in the inner cavity of the threaded groove wall of the reciprocating threaded groove rod 5, under the limiting action of the three limit rods 71 on the sliding disk 72, at this time, the sliding disk 72 will move left and right on the side wall of the reciprocating threaded groove rod 5. And because the mixing plate 74 is inclined on the side wall of the positioning seat 73, at this time, the mixing plate 74 can continuously rotate with the flow of the water, and cooperate with the mixing holes 741 opened on the side wall of the mixing plate 74 to realize the stirring and mixing of the water body, and impact and fall off the loose water scale adhered to the inner wall of the heat exchange cylinder 3, ensuring the heat exchange effect of the entire device on the high-temperature waste gas;

[0052] It should be noted that when the reciprocating threaded groove rod 5 rotates, the reciprocating threaded groove rod 5 can drive the extension rod 81 to rotate the cam block 82. Since the side wall of the ejector rod 85 abuts against the side wall of the cam block 82, the cam block 82 will continuously squeeze the piston plate 84 to move up and down in the inner cavity of the piston box 83. When the piston plate 84 moves downward in the inner cavity of the piston box 83, the pressure of the sodium bicarbonate solution in the lower cavity of the piston box 83 will continuously increase. The sodium bicarbonate solution in the piston box 83 will enter the liquid inlet ring 87 through the water outlet rod 871. Then, the sodium bicarbonate solution in the liquid inlet ring 87 will enter the heat exchange cylinder 3 through the water inlet cover 32. Along with the continuous mixing of the sodium bicarbonate solution with the agitated sodium bicarbonate solution, the effect of cleaning the scale adhering to the inner wall of the heat exchange cylinder 3 by the flowing water is further improved, thereby greatly improving the effect of the entire device in purifying the waste gas. When the piston plate 84 moves upward in the inner cavity of the piston box 83, the pressure of the sodium bicarbonate solution in the lower cavity of the piston box 83 will continuously decrease. At this time, the sodium bicarbonate solution in the water storage box 88 can enter the inner cavity of the piston box 83 through the water inlet rod 881 to replenish the sodium bicarbonate solution in the piston box 83, making a prerequisite for adding sodium bicarbonate solution into the heat exchange cylinder 3 next time.

[0053] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement of the technical solution of the present invention by those of ordinary skill in the art does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A tail gas purification device for smelting metal waste slag in a direct current plasma furnace, comprising an equipment base (1), vertical plates (2) are fixedly installed on the left and right sides of the upper end surface of the equipment base (1), a heat exchange tube (3) is arranged between the vertical plates (2) on the left and right sides, a water outlet cover (31) is fixedly installed on the left side of the side wall of the heat exchange tube (3), and a water inlet cover (32) is fixedly installed on the right side of the side wall of the heat exchange tube (3), characterized in that: The inner cavity side walls of the heat exchange cylinder (3) are fixedly mounted with brackets (4) on both sides, and the inner cavities of the brackets (4) on both sides are rotatably mounted with reciprocating threaded groove rods (5). The outer wall of the heat exchange cylinder (3) is wound with a heat exchange coil (6), and further comprises: A stirring mechanism (7), wherein the stirring mechanism (7) is arranged in the inner cavity of the heat exchange cylinder (3), and the stirring mechanism (7) is used to mix the clean water in the heat exchange cylinder (3); A descaling mechanism (8), the descaling mechanism (8) being arranged on the side wall of the water inlet cover (32), and the descaling mechanism (8) being used to clean the scale on the inner wall of the heat exchange cylinder (3); A rotating mechanism (9), wherein the rotating mechanism (9) is arranged on a side wall of the water outlet cover (31), and the rotating mechanism (9) is used to rotate the heat exchange cylinder (3).

2. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 1, characterized in that: The stirring mechanism (7) comprises a limiting rod (71) fixedly mounted on the side wall of the bracket (4), and a sliding plate (72) slidably mounted on the side wall of the limiting rod (71); a positioning seat (73) is slidably mounted on the side wall of the sliding plate (72); a mixing plate (74) is fixedly mounted on the side wall of the positioning seat (73); and a guide impeller (75) is fixedly mounted on the left end surface of the reciprocating thread groove rod (5).

3. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 2, characterized in that: The limiting rods (71) are arranged in three groups equidistantly in the axial direction of the sliding disk (72); a stepped groove (721) is provided on the side wall of the sliding disk (72); the positioning seat (73) slides in the inner cavity of the stepped groove (721); a plurality of groups of the positioning seats (73) are arranged in an annular manner equidistantly on the side wall of the sliding disk (72); a positioning ring (731) is fixedly installed in the inner cavity of each group of the positioning seats (73); and a mixing hole (741) is provided on the side wall of the mixing plate (74).

4. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 2, characterized in that: A limit block (51) is slidably mounted in the inner cavity of the thread groove wall of the reciprocating thread groove rod (5); the limit block (51) is fixedly mounted on the inner wall of the sliding plate (72); the guide impeller (75) is arranged in the inner cavity of the water outlet cover (31); a water inlet pipe (321) is fixedly mounted on the side wall of the water inlet cover (32); and the mixing plate (74) is arranged obliquely on the side wall of the positioning seat (73).

5. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 1, characterized in that: The descaling mechanism (8) comprises an extension rod (81) fixedly mounted on the right end face of the reciprocating threaded groove rod (5), a cam block (82) fixedly mounted on the side wall of the extension rod (81), a piston box (83) fixedly mounted on the side wall of the vertical plate (2) located on the right side, a piston plate (84) slidably mounted in the inner cavity of the piston box (83), a push rod (85) fixedly mounted on the upper end face of the piston plate (84), and a return spring (86) wound around the side wall of the push rod (85).

6. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 5, characterized in that: The push rod (85) is slidably connected to the piston box (83), the side wall of the push rod (85) is tightly pressed against the side wall of the cam block (82), the two ends of the return spring (86) are respectively fixed on the side wall of the piston plate (84) and the inner wall of the piston box (83), a liquid inlet ring (87) is rotatably mounted on the right side of the side wall of the water inlet cover (32), and a water storage box (88) is fixedly mounted on the side wall of the vertical plate (2) located on the right side.

7. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 5, characterized in that: A water inlet rod (881) is fixedly mounted on the lower part of the side wall of the piston box (83); a water outlet rod (871) is fixedly mounted on the left side of the side wall of the piston box (83); the inner cavity of the water inlet rod (881) is provided with a one-way water valve with an outlet toward the inner cavity of the piston box (83); the inner cavity of the water outlet rod (871) is provided with a one-way water valve with an outlet toward the inner cavity of the liquid inlet ring (87); a water inlet hole (322) is opened on the side wall of the water inlet cover (32); the water inlet hole (322) is located in the inner cavity of the liquid inlet ring (87).

8. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 1, characterized in that: The rotating mechanism (9) comprises a transmission worm gear (91) fixedly mounted on the side wall of the water outlet cover (31), and a mounting plate (92) fixedly mounted on the side wall of the left vertical plate (2); a transmission worm gear (93) is rotatably mounted in the inner cavity of the mounting plate (92); and a driving motor (94) is fixedly mounted on the side wall of the left vertical plate (2) via a frame.

9. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 8, characterized in that: The transmission worm wheel (91) is meshingly connected with the transmission worm (93), and the output shaft end of the drive motor (94) is fixedly connected with the transmission worm (93).

10. The tail gas purification device for smelting metal waste slag in a direct current plasma furnace according to claim 1, characterized in that: A filter plate (61) is detachably mounted at the tube mouth of the heat exchange coil (6), and the inner cavity of the heat exchange coil (6) is filled with one or a combination of activated carbon particles and calcium oxide particles.

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