Chemical waste recycling device

Abstract

The utility model relates to a kind of chemical waste recycling device in waste treatment technical field, including tower body, the tower body inner chamber is equipped with the core barrel coaxial with it, the tower body inner chamber is divided into annular oxidation desulfurization area and circular carbonization neutralization area, and oxidation desulfurization area and carbonization neutralization area top are communicated;Annular gas distributor and catalytic converter fixed bed are sequentially arranged in oxidation desulfurization area inside from bottom to top, the outer heat exchange spiral pipe and the heat insulation outer sheathing of covering its outside are covered in the upper part of catalytic converter fixed bed corresponding the tower body outer wall;The design of industrial wastewater flow path in the utility model not only prevents oxidation desulfurization area temperature excessively high, but also preheats alkali residue, achieves the purpose of reducing external heating equipment energy consumption, simultaneously prevents carbonization neutralization area temperature excessively low, reaches the function of reducing energy consumption, and guarantees the efficient reaction of two reaction zones.

Description

Technical Field

[0001] This utility model relates to the field of waste treatment technology, and in particular to a device for recycling and reusing chemical waste. Background Technology

[0002] Liquefied petroleum gas (LPG), a key feedstock for oil refineries, typically contains a certain amount of sulfides. These sulfides must be removed using chemical or adsorption methods, depending on the requirements of downstream processing units or storage conditions. The main sulfides in LPG are hydrogen sulfide and mercaptans. Conventional processes employ LPG desulfurization technology, commonly using alkaline washing to remove residual hydrogen sulfide and the Merlox extraction oxidation process for mercaptan removal.

[0003] Existing alkaline slag treatment devices, such as the one disclosed in CN102557300B for desulfurization and neutralization of liquefied petroleum gas alkaline slag, include an alkaline slag oxidation, desulfurization, carbonization, and neutralization tower. This tower is divided into an oxidation desulfurization zone and a carbonization neutralization zone by a partition. It employs full-phase contact microbubble oxidation technology to oxidize and reduce the sodium sulfide and sodium mercaptide content in the alkaline slag to below 10 ppm. Simultaneously, it uses multi-stage full-phase contact microbubble carbonization technology to completely carbonize and neutralize sodium hydroxide in the alkaline slag into sodium bicarbonate, further reducing residual sodium sulfide, sodium mercaptide, and disulfides to below 1 ppm. However, since the optimal oxidation desulfurization temperature is 50-65℃, the practical application of this device requires external heating equipment to heat the alkaline slag entering the oxidation desulfurization zone to 30-70℃.

[0004] Considering that oxidative desulfurization is an exothermic reaction and carbon neutralization is an endothermic reaction, we designed a chemical waste recycling and reuse device. The heat generated by the exothermic reaction of oxidative desulfurization is used to heat the carbon neutralization reaction and the alkaline residue entering the oxidative desulfurization zone, thereby reducing the energy consumption of external heating equipment. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a chemical waste recycling and reuse device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A chemical waste recycling and reuse device includes a tower body, the inner cavity of which is provided with a core cylinder coaxial with it, dividing the inner cavity of the tower body into an annular oxidation desulfurization zone and a circular carbonization neutralization zone, and the tops of the oxidation desulfurization zone and the carbonization neutralization zone are connected. The bottom of the oxidation desulfurization zone is connected to an alkaline residue feed pipeline, and the top is connected to a tail gas discharge pipeline. Inside, from bottom to top, an annular gas distributor and a catalyst fixed bed are arranged in sequence. The annular gas distributor is connected to a compressed air pipeline. The bottom of the carbonization neutralization zone is connected to a waste discharge pipeline. Inside, from top to bottom, there are a liquid distributor, an upper gas distributor, and a lower gas distributor. The liquid distributor is connected to an industrial wastewater pipeline, and the upper and lower gas distributors are connected to carbon dioxide pipelines. The outer wall of the tower is covered with an external heat exchange spiral tube and an external heat insulation plate covering the upper part of the catalyst fixed bed. The industrial wastewater pipeline passes through an external heat exchange spiral tube and a heat exchanger hot-side channel before connecting to a liquid distributor; the alkali residue feed pipeline passes through a heat exchanger cold-side channel before connecting to the bottom of the oxidation desulfurization zone.

[0007] Furthermore, the industrial wastewater pipeline has a first branch pipe and a second branch pipe; The first branch pipe is connected to the liquid distributor in sequence via the external heat exchange spiral tube and the heat release channel of the heat exchanger; The second branch pipe is directly connected to the liquid distributor.

[0008] Furthermore, the inner wall of the core tube is embedded with an inner heat exchange spiral tube and a heat-insulating inner protective plate covering its inner side in the upper part of the catalyst fixed bed; The industrial wastewater pipeline is connected to the liquid distributor in sequence via an external heat exchange spiral tube, an internal heat exchange spiral tube, and the heat release channel of the heat exchanger.

[0009] Furthermore, a drive motor is provided at the bottom of the core cylinder, and its output shaft drives and connects to a hollow shaft. The hollow shaft sequentially seals and rotates to connect to the carbon dioxide pipeline from bottom to top, and is fixedly connected to the lower gas distributor and the upper gas distributor, thereby driving the lower gas distributor and the upper gas distributor to rotate.

[0010] Furthermore, the bottom plate of the tower body is a flat plate section located below the oxidation desulfurization zone, and a downwardly concave arc-shaped section or conical section located below the carbonization neutralization zone.

[0011] Furthermore, the exhaust gas pipeline is equipped with a condenser.

[0012] Furthermore, the exhaust gas pipeline is equipped with an activated carbon adsorption tank located behind the condenser.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. Industrial wastewater flows sequentially through external heat exchange spiral tubes or internal and external heat exchange spiral tubes to absorb the reaction heat generated in the oxidation desulfurization zone, preventing the temperature in the oxidation desulfurization zone from becoming too high. The preheated wastewater is then heated by a heat exchanger before entering the alkaline slag in the oxidation desulfurization zone, thereby reducing the energy consumption of external heating equipment. At the same time, it also provides high-temperature industrial wastewater to the carbonization neutralization zone to prevent the temperature in the carbonization neutralization zone from becoming too low, thereby reducing energy consumption and ensuring the efficient reaction in both reaction zones. 2. The installation of condensers and activated carbon adsorption tanks ensures that the exhaust gas meets stringent emission standards. 3. It can drive the upper and lower gas distributors to rotate through the drive motor, so that carbon dioxide is evenly dispersed in the carbonization neutralization zone, increasing the gas-liquid contact area and avoiding incomplete local reaction. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first structure of this utility model; Figure 2 This is a schematic diagram of the second structure of this utility model; Figure 3 This is a schematic diagram of the third structure of this utility model.

[0015] In the diagram: 1. Tower body; 2. Core cylinder; 3. Alkali residue feed pipeline; 4. Annular gas distributor; 5. Catalyst fixed bed; 6. Liquid distributor; 7. Upper gas distributor; 8. Lower gas distributor; 9. Industrial wastewater pipeline; 91. First branch pipe; 92. Second branch pipe; 10. Compressed air pipeline; 11. Carbon dioxide pipeline; 12. External heat exchange spiral tube; 13. Insulated outer protective plate; 14. Heat exchanger; 15. Tail gas emission pipeline; 16. Waste discharge pipeline; 17. Internal heat exchange spiral tube; 18. Insulated inner protective plate; 19. Drive motor; 20. Hollow shaft; 21. Condenser; 22. Activated carbon adsorption tank. Detailed Implementation

[0016] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.

[0017] Example 1, in conjunction with Appendix Figure 1 A chemical waste recycling and reuse device, comprising: The tower body 1 has a core cylinder 2 coaxial with it in its inner cavity, which divides the tower body into an annular oxidation desulfurization zone and a circular carbonization neutralization zone, with the tops of the two zones connected. Specifically, the lower end of the core cylinder 2 is connected to the inner bottom surface of the tower body 1 by seamless welding, and there is a gap between the upper end and the inner top surface of the tower body 1.

[0018] The oxidative desulfurization zone is connected to the alkali residue feed pipeline 3 at the bottom and the tail gas emission pipeline 15 at the top; the interior is equipped with an annular gas distributor 4 and a catalyst fixed bed 5 from bottom to top. The annular gas distributor 4 is connected to the compressed air pipeline 10.

[0019] The carbonization and neutralization zone is connected to the waste discharge pipeline 16 at the bottom; the interior is equipped with a liquid distributor 6, an upper gas distributor 7 and a lower gas distributor 8 from top to bottom; The liquid distributor 6 is connected to the industrial wastewater pipeline 9, and the upper gas distributor 7 and the lower gas distributor 8 are both connected to the carbon dioxide pipeline 11.

[0020] The outer wall of the tower body 1 is covered with an external heat exchange spiral tube 12 corresponding to the upper part of the catalyst fixed bed 5, and the outer side is covered with a heat-insulating outer protective plate 13.

[0021] The heat recovery system connects the industrial wastewater pipeline 9 to the liquid distributor 6 via the external heat exchange spiral tube 12 and the heat exchanger 14 hot side channel; the alkali residue feed pipeline 3 connects to the bottom of the oxidation desulfurization zone via the heat exchanger 14 cold side channel.

[0022] Depending on the requirements, the bottom plate of tower body 1 is a flat plate section located below the oxidation and desulfurization zone, and a downwardly concave arc-shaped section or conical section located below the carbonization and neutralization zone.

[0023] Work process: After being heated by heat exchanger 14, the alkali residue in the alkali residue feed pipeline 3 enters the bottom of the oxidation desulfurization zone. Compressed air is dispersed into tiny bubbles by the annular gas distributor and rises. A chemical reaction (exothermic reaction) occurs in the catalyst fixed bed 5. Sodium sulfide in the alkali residue is oxidized to sodium thiosulfate and sodium sulfate, and sodium thiolate is oxidized to sodium hydroxide and disulfide. The gas flows to the next treatment process through the tail gas discharge pipeline. Industrial wastewater flows through pipeline 9 and external heat exchange spiral tube 12 to absorb the heat from the exothermic reaction in the oxidation and desulfurization zone, and then heats the alkaline slag through heat exchanger 14. At the same time, the preheated industrial wastewater enters the carbonization and neutralization zone to carry out a carbon neutralization reaction (endothermic reaction) and generates sodium bicarbonate, which is discharged through waste discharge pipeline 16.

[0024] The industrial wastewater is heated by the exothermic reaction in the desulfurization zone, and the alkaline slag is heated by the heat exchanger 14, thereby reducing the energy consumption of the external heating equipment and ensuring the heat required for the endothermic reaction in the carbonization and neutralization zone.

[0025] Example 2, in conjunction with Appendix Figure 2A chemical waste recycling and reuse device, based on Example 1: The inner wall of the core cylinder 2 is embedded with an inner heat exchange spiral tube 17 corresponding to the upper part of the catalyst fixed bed 5, and the inner side is covered with a heat-insulating inner protective plate 18; the industrial wastewater pipeline 9 flows through the outer heat exchange spiral tube 12, the inner heat exchange spiral tube 17, the heat exchanger 14 heat release channel in sequence, and finally enters the liquid distributor 6.

[0026] This allows industrial wastewater to pass through both the external heat exchange spiral tube 12 and the internal heat exchange spiral tube 17 simultaneously, fully absorbing the heat released by the oxidation and desulfurization zone.

[0027] In this embodiment, the industrial wastewater pipeline 9 has a first branch pipe 91 and a second branch pipe 92; The first branch pipe 91 is connected to the liquid distributor 6 via the heat dissipation channel of the external heat exchange spiral pipe 12 and the heat exchanger 14 in sequence; the second branch pipe 92 is directly connected to the liquid distributor 6.

[0028] Furthermore, the first branch pipe 91 and the second branch pipe 92 are connected by a three-way solenoid valve.

[0029] This allows for better control of the temperature in the carbonization and neutralization zone by adjusting the synergistic effect of the first branch pipe 91 and the second branch pipe 92, ensuring that the carbonization and neutralization zone is at the ideal temperature of 30-40℃.

[0030] In this embodiment, a condenser 21 and an activated carbon adsorption tank 22 are sequentially installed on the exhaust gas emission pipeline 15. The high-temperature exhaust gas is condensed by the condenser 21, and the condensate is returned to the tower body 1 for further treatment.

[0031] Example 3, in conjunction with Appendix Figure 3 A chemical waste recycling and reuse device, based on Example 1: a drive motor 19 is provided at the bottom of the core cylinder 2, and the output shaft drives the hollow shaft 20; The hollow shaft 20 is sealed and rotatably connected to the carbon dioxide pipeline 11, and is fixedly connected to the upper gas distributor 7 and the lower gas distributor 8, causing both to rotate. This ensures that the carbon dioxide is evenly dispersed through the rotating gas distributors, enhancing the contact efficiency with the waste liquid and thus increasing the reaction rate.

[0032] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A chemical waste recycling and reuse device, comprising a tower body (1), characterized in that, The inner cavity of the tower body (1) is provided with a core cylinder (2) coaxial with it, which divides the inner cavity of the tower body (1) into an annular oxidation desulfurization zone and a circular carbonization neutralization zone, and the tops of the oxidation desulfurization zone and the carbonization neutralization zone are connected. The bottom of the oxidative desulfurization zone is connected to an alkaline residue feed pipeline (3), and the top is connected to a tail gas discharge pipeline (15). Inside, an annular gas distributor (4) and a catalyst fixed bed (5) are arranged sequentially from bottom to top. The annular gas distributor (4) is connected to a compressed air pipeline (10). The bottom of the carbonization neutralization zone is connected to a waste discharge pipeline (16). Inside, from top to bottom, there are a liquid distributor (6), an upper gas distributor (7), and a lower gas distributor (8). The liquid distributor (6) is connected to an industrial wastewater pipeline (9), and the upper gas distributor (7) and the lower gas distributor (8) are connected to a carbon dioxide pipeline (11). The outer wall of the tower body (1) is covered with an external heat exchange spiral tube (12) and an external heat insulation outer protective plate (13) covering the upper part of the catalyst fixed bed (5). The industrial wastewater pipeline (9) is connected to the liquid distributor (6) after passing through the external heat exchange spiral tube (12) and the hot side channel of the heat exchanger (14); the alkali residue feed pipeline (3) is connected to the bottom of the oxidation desulfurization zone after passing through the cold side channel of the heat exchanger (14).

2. The chemical waste recycling and reuse device according to claim 1, characterized in that: The industrial wastewater pipeline (9) has a first branch pipe (91) and a second branch pipe (92); The first branch pipe (91) is connected to the liquid distributor (6) in sequence through the heat dissipation channel of the external heat exchange spiral pipe (12) and the heat exchanger (14); The second branch pipe (92) is directly connected to the liquid distributor (6).

3. The chemical waste recycling and reuse device according to claim 1, characterized in that: The inner wall of the core tube (2) is fitted with an inner heat exchange spiral tube (17) and a heat-insulating inner protective plate (18) covering its inner side in the upper part of the catalyst fixed bed (5). The industrial wastewater pipeline (9) is connected to the liquid distributor (6) in sequence via the heat dissipation channel of the external heat exchange spiral tube (12), the internal heat exchange spiral tube (17), and the heat exchanger (14).

4. The chemical waste recycling and reuse device according to claim 1, characterized in that: The core cylinder (2) is equipped with a drive motor (19) at the bottom, whose output shaft drives and connects to a hollow shaft (20). The hollow shaft (20) sequentially seals and rotates to connect to the carbon dioxide pipeline (11) from bottom to top, and is fixedly connected to the lower gas distributor (8) and the upper gas distributor (7), thereby driving the lower gas distributor (8) and the upper gas distributor (7) to rotate.

5. The chemical waste recycling and reuse device according to claim 1, characterized in that: The bottom plate of the tower body (1) is a flat plate section located below the oxidation desulfurization zone, and a downward-concave arc-shaped section or conical section located below the carbonization neutralization zone.

6. The chemical waste recycling and reuse device according to claim 1, characterized in that: The exhaust gas pipeline (15) is equipped with a condenser (21).

7. A chemical waste recycling and reuse device according to claim 6, characterized in that: The exhaust gas emission pipeline (15) is located behind the condenser (21) and has an activated carbon adsorption tank (22).

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