Oxygen control dry distillation furnace for waste mercury catalyst corrosive gas

Abstract

The present application relates to the technical field of chemical equipment, especially to a waste mercury catalyst corrosive mixed gas oxygen control dry distillation furnace, an oxygen detection mechanism for detecting oxygen concentration is arranged on the inner wall of the furnace cylinder, a first connecting pipe is arranged through the outer wall of the furnace cylinder, one end of the first connecting pipe extends into the inner wall of the furnace cylinder and is connected with a circular pipe, a plurality of gas outlets are arranged at the bottom end of the circular pipe along the axial line direction at equal intervals, the other end of the first connecting pipe is connected with a heat insulation seat, a gas outlet pipe is connected with the upper end of one side of the inner wall of the furnace cylinder, and a cooling mechanism is connected with the bottom end of the outer wall of the furnace cylinder. The oxygen concentration in the cavity is detected in real time by the oxygen detection mechanism, the external gas supply device guides nitrogen into the first connecting pipe from the second connecting pipe, the first connecting pipe guides the nitrogen into the circular pipe, the nitrogen in the circular pipe is sprayed from the plurality of gas outlets, the oxygen concentration in the cavity is reduced, the oxygen content in the cavity is stabilized in a set range, the oxidation of mercury is effectively inhibited, and the corrosion of the equipment is avoided.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, and in particular to a controlled oxygen dry distillation furnace for corrosive mixed gases produced by waste mercury catalyst. Background Technology

[0002] In the calcium carbide process for producing polyvinyl chloride, mercuric chloride catalyst is used as the catalyst. After a certain period of use, it becomes waste catalyst. Because it contains a certain amount of mercuric chloride, it is classified as hazardous waste and cannot be discarded at will. Generally, the mercuric chloride in the waste catalyst is directly recovered by heating. However, when the waste mercuric catalyst is dry-distilled in a dry distillation furnace, the mercury in the waste mercuric catalyst is easily converted into mercuric oxide or reacts with other chlorides to form mercuric chloride in a high-temperature and oxygen-rich environment, which reduces the recovery rate of elemental mercury and causes corrosive gases to corrode the equipment. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies, such as the easy conversion of mercury in waste mercury catalysts into mercuric oxide or reaction with other chlorides to form mercuric chloride under high temperature and oxygen conditions, which reduces the recovery rate of elemental mercury and causes corrosive gases to corrode the equipment. The invention proposes a waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The design includes an oxygen-controlled dry distillation furnace for a waste mercury catalyst corrosive mixed gas, comprising an outer wall of a furnace cylinder, an inner wall of a furnace cylinder inside the outer wall, electromagnetic wires on both sides of the outer wall of the inner wall of the furnace cylinder, an oxygen measuring mechanism for detecting oxygen concentration on the inner wall of the inner wall of the furnace cylinder, a first connecting pipe penetrating through the outer wall of the furnace cylinder, one end of the first connecting pipe extending into the inner wall of the furnace cylinder and connected to a circular annular pipe, a plurality of gas outlets evenly spaced along the axis at the bottom end of the circular annular pipe, a heat insulation seat connected to the other end of the first connecting pipe, a gas outlet fitting connected to the upper end of one side of the inner wall of the furnace cylinder, and a cooling mechanism connected to the bottom end of the outer wall of the furnace cylinder.

[0005] Preferably, a heat-insulating filler layer is provided between the outer wall of the furnace cylinder and the inner wall of the furnace cylinder, and the heat-insulating filler layer is a nanoporous heat-insulating filler layer.

[0006] Preferably, a retaining ring is provided on the inner wall of the furnace cylinder at the upper end of the annular tube, and an inclined surface is provided at the upper end of the retaining ring, the inclined surface being inclined downward towards the axis.

[0007] Preferably, the heat insulation seat is connected to a second connecting pipe, and the second connecting pipe is equipped with a one-way valve.

[0008] Preferably, the gas outlet pipe includes an outer pipe that is connected to the inner wall of the furnace cylinder, an inner pipe is provided on the inner wall of the outer pipe, and an electric heating tape for heating is provided between the outer pipe and the inner pipe.

[0009] Preferably, the inner tube is a corrosion-resistant alloy tube.

[0010] Preferably, the cooling mechanism includes a chamber, which is connected to the bottom outlet of the outer wall of the furnace cylinder. A discharge port is provided at the bottom of the chamber. A partition pipe is fixedly connected inside the chamber. A chamber is provided between the partition pipe and the inner wall of the chamber. A heat dissipation plate is provided on the outer wall of the partition pipe. An air inlet pipe is connected to the bottom of one side of the chamber, and an air outlet pipe is connected to the upper side of the other side of the chamber.

[0011] Preferably, the heat sink is provided with several plates that are evenly distributed along the axis of the partition tube.

[0012] Preferably, it also includes an anti-blocking mechanism, which includes a fixed plate fixedly connected to the bottom of the silo body. A guide rod is slidably connected to the fixed plate, and a movable plate is fixedly connected to the upper end of the guide rod. The bottom end of the movable plate is connected to the fixed plate by a spring. A vibration motor is installed at the upper end of the movable plate, and a hammer column is fixedly connected to the upper end of the movable plate. A gap is provided between the hammer column and the bottom of the silo body.

[0013] Preferably, the spring is a stainless steel spring.

[0014] The oxygen-controlled dry distillation furnace for waste mercury catalyst corrosive mixed gas proposed in this invention has the following advantages: 1. The oxygen concentration in the cavity is detected in real time by the oxygen measuring mechanism. The external gas supply device introduces nitrogen into the first connecting pipe through the second connecting pipe. The first connecting pipe introduces nitrogen into the annular pipe. The nitrogen in the annular pipe is sprayed out from several gas outlets to reduce the oxygen concentration in the cavity and stabilize the oxygen content in the cavity within the set range, effectively inhibiting mercury oxidation and thus avoiding equipment corrosion.

[0015] 2. As solid residue falls into the partition tube, the heat on the solid residue is conducted to the heat dissipation plate, which releases the heat into the chamber. The heat dissipation plate increases the heat exchange area, thereby increasing the contact area between the cooling medium and the heat source and improving the cooling effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace proposed in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace proposed in this invention. Figure 2 ; Figure 3 This is a schematic diagram of the connection between the outer wall of the furnace cylinder and the gas outlet pipe in the oxygen-controlled dry distillation furnace for waste mercury catalyst corrosive mixed gas proposed in this invention. Figure 4This is a schematic diagram of the connection between the outer wall of the furnace cylinder and the cooling mechanism in the oxygen-controlled dry distillation furnace for waste mercury catalyst corrosive mixed gas proposed in this invention. Figure 5 This is a cross-sectional schematic diagram of the connection between the outer wall of the furnace cylinder and the cooling mechanism in the oxygen-controlled dry distillation furnace for waste mercury catalyst corrosive mixed gas proposed in this invention. Figure 6 This is a schematic diagram of the connection between the silo and the anti-clogging mechanism in the oxygen-controlled dry distillation furnace for the corrosive mixed gas of waste mercury catalyst proposed in this invention.

[0017] In the diagram: 1. Outer wall of furnace cylinder; 2. Inner wall of furnace cylinder; 3. Electromagnetic wire; 4. Oxygen measuring mechanism; 5. First connecting pipe; 6. Circular pipe; 7. Gas outlet; 8. Baffle ring; 9. Inclined surface; 10. Heat insulation seat; 11. Second connecting pipe; 12. One-way valve; 13. Gas outlet fitting; 14. Cooling mechanism; 15. Anti-blocking mechanism; 131. Outer pipe; 132. Inner pipe; 133. Electric heating tape; 141. Chamber; 142. Divider pipe; 143. Discharge port; 144. Chamber; 145. Heat dissipation plate; 146. Gas inlet pipe; 147. Gas outlet pipe; 151. Fixed plate; 152. Guide rod; 153. Movable plate; 154. Spring; 155. Vibration motor; 156. Hammer column. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example 1: Refer to Figure 1-3 A controlled-oxygen dry distillation furnace for a corrosive mixed gas containing waste mercury catalyst includes an outer wall 1 of the furnace cylinder, an inner wall 2 of the furnace cylinder inside the outer wall 1, and electromagnetic wires 3 on both sides of the outer wall of the inner wall 2, which are connected to an electromagnetic controller. A nanoporous heat-insulating packing layer is provided between the outer wall 1 and the inner wall 2. An oxygen measuring mechanism 4 for detecting oxygen concentration is provided on the inner wall of the inner wall 2. A first connecting pipe 5 is inserted through the outer wall 1, and one end of the first connecting pipe 5 extends into the inner wall 2 and is connected to a circular annular pipe 6. The bottom end of the annular tube 6 is provided with several air outlets 7 at equal intervals along the axis. The inner wall of the furnace cylinder 2 is provided with a retaining ring 8 at the upper end of the annular tube 6. The upper end of the retaining ring 8 is provided with an inclined surface 9, which is inclined downward towards the axis. The other end of the first connecting pipe 5 is connected to a heat insulation seat 10. The heat insulation seat 10 is connected to a second connecting pipe 11. The second connecting pipe 11 is provided with a one-way valve 12. The upper end of one side of the inner wall of the furnace cylinder 2 is connected to an air outlet pipe fitting 13. The bottom end of the outer wall of the furnace cylinder 1 is connected to a cooling mechanism 14. The oxygen measuring mechanism 4 includes a probe sensor, which is installed on the inner wall of the furnace cylinder 2. The probe sensor is equipped with a corundum filter element to prevent dust blockage. The probe sensor is equipped with an electric heat tracing sleeve to prevent HCl condensation and corrosion of the probe sensor.

[0020] Work process: The waste mercury catalyst to be treated is loaded into the inner wall 2 of the furnace cylinder through the top feed port, the feed port is sealed, and the oxygen concentration in the chamber is detected in real time by the probe sensor. An external gas supply device introduces nitrogen into the first connecting pipe 5 through the second connecting pipe 11. The first connecting pipe 5 then introduces the nitrogen into the annular pipe 6. The nitrogen in the annular pipe 6 is sprayed out from several outlets 7 to reduce the oxygen concentration in the cavity and stabilize the oxygen content in the cavity within a set range to prevent mercury oxidation. The probe sensor monitors the internal oxygen concentration in real time and adjusts the oxygen concentration by introducing nitrogen to keep the oxygen content at a low level, effectively inhibiting mercury oxidation and preventing equipment corrosion. The retaining ring 8 protects the annular pipe 6 to prevent waste mercury catalyst from colliding with the annular pipe 6. The inclined surface 9 prevents waste mercury catalyst from accumulating at the upper end of the annular pipe 6. After the electromagnetic controller starts the electromagnetic wire 3, it heats the inner wall 2 of the furnace cylinder, thereby achieving non-contact heating of the waste mercury catalyst. The nanoporous heat insulation filler layer blocks the heat from dissipating outward. At high temperature, the mercury in the waste mercury catalyst vaporizes with the volatile corrosive components to form a mercury-containing mixed gas. The vaporized gas moves upward and is discharged through the gas outlet pipe 13 to the condensation and recovery device for condensation and collection. After the dry distillation is completed, open the bottom outlet of the inner wall 2 of the furnace cylinder and introduce the solid residue into the cooling mechanism 14 for cooling. After cooling, it is released from the bottom.

[0021] Example 2 When gas passes through the outlet pipe 13, the gas is prone to liquefaction upon cooling, which can corrode the outlet pipe 13. (Refer to...) Figure 2-3 As another preferred embodiment of the present invention, the difference from embodiment 1 is that the gas outlet pipe 13 includes an outer pipe 131, the outer pipe 131 is connected to the inner wall 2 of the furnace cylinder, the inner wall of the outer pipe 131 is provided with a corrosion-resistant alloy inner pipe 132, and an electric heating tape 133 for heating is provided between the outer pipe 131 and the inner pipe 132. When the gas is released from the inside of the corrosion-resistant alloy inner tube 132, the electric heating tape 133 is activated to heat the corrosion-resistant alloy inner tube 132, preventing the gas temperature inside the inner tube 132 from dropping and thus preventing liquefaction corrosion.

[0022] Example 3 When waste mercury catalyst falls into the chamber for cooling, the cooling effect is poor, referring to... Figure 3-4As another preferred embodiment of the present invention, the difference from embodiment 1 is that the cooling mechanism 14 includes a chamber 141, the chamber 141 is connected to the bottom outlet of the outer wall 1 of the furnace cylinder, the bottom end of the chamber 141 is provided with a discharge port 143, a partition pipe 142 is fixedly connected inside the chamber 141, a chamber 144 is provided between the partition pipe 142 and the inner wall of the chamber 141, a heat dissipation plate 145 is provided on the outer wall of the partition pipe 142, a plurality of heat dissipation plates 145 are provided and are evenly distributed along the axis of the partition pipe 142, an air inlet pipe 146 is connected to the bottom end of one side of the chamber 144, and an air outlet pipe 147 is connected to the upper end of the other side of the chamber 144. Solid residue falls into the partition tube 142, and the heat on the solid residue is conducted to the heat dissipation plate 145. The heat dissipation plate 145 releases the heat into the chamber 144. Cold air is introduced into the chamber 144 through the air inlet pipe 146. The cold air carries the heat out through the air outlet pipe 147, thereby reducing the temperature of the solid residue and bringing it to room temperature. Finally, it is discharged from the discharge port 143. The heat dissipation plate 145 increases the heat exchange area, which increases the contact area between the cooling medium and the heat source, thereby improving the cooling effect.

[0023] Example 4 When solid residue is discharged from discharge port 143, blockage is likely to occur. (Refer to...) Figure 4-5 As another preferred embodiment of the present invention, the difference from embodiment 3 is that it also includes an anti-blocking mechanism 15. The anti-blocking mechanism 15 includes a fixed plate 151, which is fixedly connected to the bottom end of the chamber 141. A guide rod 152 is slidably connected to the fixed plate 151. A movable plate 153 is fixedly connected to the upper end of the guide rod 152. The bottom end of the movable plate 153 is connected to the fixed plate 151 by a stainless steel spring 154. A vibration motor 155 is installed on the upper end of the movable plate 153. A hammer column 156 is fixedly connected to the upper end of the movable plate 153. A gap is provided between the hammer column 156 and the bottom end of the chamber 141. After the vibration motor 155 is started, it generates high-frequency vibration. The vibration is transmitted to the movable plate 153. After being vibrated, the movable plate 153 moves back and forth in the vertical direction under the guidance of the guide rod 152. The movable plate 153 drives the hammer column 156 to continuously hit the bottom outer wall of the bin 141. The mechanical vibration generated prevents solid residue from clogging the discharge port 143.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A controlled-oxygen dry distillation furnace for a waste mercury catalyst corrosive mixed gas, comprising an outer wall of a furnace cylinder (1), wherein an inner wall of a furnace cylinder (2) is provided inside the outer wall of the outer wall of the furnace cylinder (1), and electromagnetic wires (3) are provided on both sides of the outer wall of the inner wall of the furnace cylinder (2), characterized in that, in: The inner wall of the furnace cylinder (2) is provided with an oxygen measuring mechanism (4) for detecting oxygen concentration. The outer wall of the furnace cylinder (1) is provided with a first connecting pipe (5). One end of the first connecting pipe (5) extends into the inner wall of the furnace cylinder (2) and is connected to a circular annular pipe (6). The bottom end of the circular annular pipe (6) is provided with several air outlets (7) at equal intervals along the axis. The other end of the first connecting pipe (5) is connected to a heat insulation seat (10). The upper end of one side of the inner wall of the furnace cylinder (2) is connected to an air outlet fitting (13). The bottom end of the outer wall of the furnace cylinder (1) is connected to a cooling mechanism (14).

2. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 1, characterized in that, A heat insulation filler layer is provided between the outer wall (1) of the furnace cylinder and the inner wall (2) of the furnace cylinder. The heat insulation filler layer is a nanoporous heat insulation filler layer.

3. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 1, characterized in that, A retaining ring (8) is provided on the inner wall of the furnace cylinder (2) at the upper end of the annular tube (6). An inclined surface (9) is provided at the upper end of the retaining ring (8), and the inclined surface (9) is inclined downward in the direction of the axis.

4. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 1, characterized in that, The heat insulation seat (10) is connected to a second connecting pipe (11), and a one-way valve (12) is provided on the second connecting pipe (11).

5. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 1, characterized in that, The gas outlet pipe (13) includes an outer pipe (131) which is connected to the inner wall (2) of the furnace cylinder. An inner pipe (132) is provided on the inner wall of the outer pipe (131). An electric heating tape (133) for heating is provided between the outer pipe (131) and the inner pipe (132).

6. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 4, characterized in that, The inner tube (132) is a corrosion-resistant alloy tube.

7. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 1, characterized in that, The cooling mechanism (14) includes a chamber (141) which is connected to the bottom outlet of the outer wall (1) of the furnace cylinder. A discharge port (143) is provided at the bottom of the chamber (141). A partition pipe (142) is fixedly connected inside the chamber (141). A chamber (144) is provided between the partition pipe (142) and the inner wall of the chamber (141). A heat dissipation plate (145) is provided on the outer wall of the partition pipe (142). An air inlet pipe (146) is connected to the bottom of one side of the chamber (144), and an air outlet pipe (147) is connected to the upper side of the other side of the chamber (144).

8. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 7, characterized in that, The heat sink (145) is provided with several plates that are evenly distributed along the axis of the partition tube (142).

9. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 1, characterized in that, It also includes an anti-blocking mechanism (15), which includes a fixed plate (151) fixedly connected to the bottom of the silo body (141). A guide rod (152) is slidably connected to the fixed plate (151). A movable plate (153) is fixedly connected to the upper end of the guide rod (152). The bottom end of the movable plate (153) is connected to the fixed plate (151) by a spring (154). A vibration motor (155) is installed on the upper end of the movable plate (153). A hammer column (156) is fixedly connected to the upper end of the movable plate (153). A gap is provided between the hammer column (156) and the bottom end of the silo body (141).

10. The waste mercury catalyst corrosive mixed gas oxygen-controlled dry distillation furnace according to claim 9, characterized in that, The spring (154) is a stainless steel spring.

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