Device for recycling tail gas and flash steam of autoclave
By designing a pressurized kettle exhaust and flash steam recovery device, the exhaust and flash steam are collected and used for slurry heating, the problem of the heat of the pressurized kettle and the flash steam tank not being recovered, and energy reuse and environmental protection are achieved.
Patent Information
- Application Number
- CN202422207142.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-10
AI Technical Summary
In the wet leaching process of pressurized oxygen-induced nickel sulfide leaching, the heat generated by the pressurized kettle and flash tank is not reasonably recovered, resulting in energy waste and environmental pollution.
A pressurized kettle exhaust gas and flash vapor recovery device is designed, and heat is collected through exhaust gas pipelines and flash exhaust emission pipes and transported to the normal pressure leaching tank for slurry heating. The heat input is controlled by using temperature sensors and valves to achieve heat reuse and zero exhaust emissions.
It reduces the amount of steam used in production, reduces energy consumption costs, and solves the environmental pollution problems caused by direct exhaust emissions.
Smart Images
Figure CN223134526U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrometallurgy, and particularly relates to a device for recycling the tail gas and flash steam of a pressure autoclave. Background Technique
[0002] In the production process of pressure oxygen leaching of nickel sulfide by hydrometallurgy, after the pulp is heated to 70°C - 90°C by high-temperature steam in the pre-leaching process, the pulp is pumped into the pressure autoclave through a diaphragm metering pump. The pulp reacts violently with oxygen to generate nickel sulfate solution and a large amount of heat, and this part of the heat is released through the tail gas system of the pressure autoclave. And after the discharge of the pressure autoclave passes through the pre-flash tank and the flash tank, part of the heat is also generated. These two parts of heat are directly discharged into the atmosphere, resulting in a direct waste of thermal energy resources and no reasonable recycling, and the production cost remains high. At the same time, the discharged tail gas will also cause certain environmental pollution. Content of the Utility Model
[0003] Aiming at the deficiencies of the prior art, the utility model provides a device for recycling the tail gas and flash steam of a pressure autoclave, realizing the recycling of the tail gas and flash steam of the pressure autoclave, saving energy costs and avoiding environmental pollution at the same time.
[0004] To achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A device for recycling the tail gas and flash steam of a pressure autoclave includes a pressure autoclave and a cascade flash evaporation system. A tail gas pipeline is connected to the pressure autoclave, and the other end of the tail gas pipeline is connected to an atmospheric leaching tank; the cascade flash evaporation system includes a pre-flash tank and a flash tank connected in communication. A flash exhaust gas discharge pipe is connected to the flash tank, and the flash exhaust gas discharge pipe is connected to the tail gas pipeline; a regulating valve group is installed on the side of the tail gas pipeline close to the pressure autoclave, and a butterfly valve is installed on the side close to the atmospheric leaching tank; the regulating valve group includes an equal-diameter tee connected to the tail gas pipeline, and the other two branches of the equal-diameter tee are respectively connected to a first branch pipe and a second branch pipe. Two cock valves and a tail gas regulating valve are installed on the first branch pipe, and the tail gas regulating valve is located between the two cock valves. A tail gas bypass valve is installed on the second branch pipe. A temperature sensor is installed on the atmospheric leaching tank, and the temperature sensor is interlocked with the tail gas regulating valve and the tail gas bypass valve for control.
[0006] Compared with the prior art, the utility model has the following beneficial effects:
[0007] This system discharges and collects the tail gas and flash steam of the pressure autoclave through the tail gas pipeline and the flash exhaust gas discharge pipe and then passes them into the atmospheric leaching tank for heating the pulp, reducing the amount of steam used in production, thereby greatly reducing the energy consumption cost; and solving the environmental pollution problem caused by the direct discharge of the tail gas, which has important guiding significance for the nickel oxygen pressure leaching production of hydrometallurgy. Description of the Drawings
[0008] Figure 1 This is a schematic structural diagram of the present utility model.
[0009] In the figure, 1 - autoclave, 2 - tail gas regulating valve, 3 - tail gas bypass valve, 4 - plug valve, 5 - equal - diameter tee, 6 - tail gas pipeline, 7 - first branch pipe, 8 - second branch pipe, 9 - pre - flash evaporation tank, 10 - flash evaporation tank, 11 - flash evaporation waste gas discharge pipe, 12 - temperature sensor, 13 - butterfly valve, 14 - atmospheric pressure leaching tank. Specific embodiments
[0010] The following further explains the present utility model with reference to the accompanying drawings.
[0011] As Figure 1 shown, a device for recycling autoclave tail gas and flash evaporation gas includes an autoclave 1 and a cascade flash evaporation system. A tail gas pipeline 6 is connected to the autoclave 1, and the other end of the tail gas pipeline 6 is connected to an atmospheric pressure leaching tank 14; the cascade flash evaporation system includes a pre - flash evaporation tank 9 and a flash evaporation tank 10 that are connected and communicate with each other. A flash evaporation waste gas discharge pipe 11 is connected to the flash evaporation tank 10, and the flash evaporation waste gas discharge pipe 11 is connected to the tail gas pipeline 6; a regulating valve group is installed on the tail gas pipeline 6 near the autoclave 1 side, and a butterfly valve 13 is installed near the atmospheric pressure leaching tank 14 side; the regulating valve group includes an equal - diameter tee 5 connected to the tail gas pipeline 6, and the other two ports of the equal - diameter tee 5 are respectively connected to a first branch pipe 7 and a second branch pipe 8. Two plug valves 4 and a tail gas regulating valve 2 are installed on the first branch pipe 7, and the tail gas regulating valve 2 is located between the two plug valves 4. A tail gas bypass valve 3 is installed on the second branch pipe 8. A temperature sensor 12 is installed on the atmospheric pressure leaching tank 14, and the temperature sensor 12 is interlocked and controlled with the tail gas regulating valve 2 and the tail gas bypass valve 3 respectively.
[0012] The working process of the present utility model is as follows:
[0013] When the autoclave 1 exhausts gas, the plug valves 4 before and after the first branch pipe 7 and the butterfly valve 13 at the front end of the atmospheric pressure leaching tank 14 are opened simultaneously. The opening of the tail gas regulating valve 2 is adjusted to 50% through the PLC control system. The high - temperature tail gas enters the atmospheric pressure leaching tank 14 through the tail gas pipeline 6. At this time, the temperature of the pulp in the tank is measured by the temperature sensor 12 at any time. Since the opening of the butterfly valve 13 is constant, when the temperature of the pulp in the tank is lower than the lower limit set by the process, the opening of the tail gas regulating valve 2 can be increased. On the contrary, when the temperature of the pulp in the tank is higher than the upper limit set by the process, the opening of the tail gas regulating valve 2 can be decreased.
[0014] If the tail gas regulating valve 2 fails, the interlock with the temperature sensor 12 is disconnected through the PLC control system, the tail gas bypass valve 3 is opened, the interlock between the tail gas bypass valve 3 and the temperature sensor 12 is established, and the plug valves 4 before and after the tail gas regulating valve 2 are closed simultaneously for troubleshooting.
[0015] During the above working process, the tail gas regulating valve 2 and the tail gas bypass valve 3 adopt electromagnetic regulating valves.
[0016] In addition, to prevent the tail gas discharged from the autoclave 1 from flushing into the cascade flash evaporation system, a check valve is also installed on the flash evaporation waste gas discharge pipe 11.
[0017] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.
Claims
1. A device for recycling the tail gas and flash steam of an autoclave, characterized in that: It includes an autoclave (1) and a cascade flash evaporation system. A tail gas pipeline (6) is connected to the autoclave (1), and the other end of the tail gas pipeline (6) is connected to an atmospheric pressure leaching tank (14); the cascade flash evaporation system includes a pre-flash evaporation tank (9) and a flash evaporation tank (10) that are connected and communicate with each other. A flash evaporation exhausted gas discharge pipe (11) is connected to the flash evaporation tank (10), and the flash evaporation exhausted gas discharge pipe (11) is connected to the tail gas pipeline (6); a regulating valve group is installed on the side of the tail gas pipeline (6) close to the autoclave (1), and a butterfly valve (13) is installed on the side close to the atmospheric pressure leaching tank (14); the regulating valve group includes an equal-diameter tee (5) connected to the tail gas pipeline (6), and the other two ports of the equal-diameter tee (5) are respectively connected to a first branch pipe (7) and a second branch pipe (8). Two cock valves (4) and a tail gas regulating valve (2) are installed on the first branch pipe (7), and the tail gas regulating valve (2) is located between the two cock valves (4). A tail gas bypass valve (3) is installed on the second branch pipe (8).
2. The tail gas and flash steam recovery and utilization device of an autoclave according to claim 1, characterized in that: A temperature sensor (12) is installed on the atmospheric pressure leaching tank (14), and the temperature sensor (12) is interlocked and controlled with the tail gas regulating valve (2) and the tail gas bypass valve (3) respectively.
3. The waste gas recovery and utilization device for autoclave tail gas and flash steam according to claim 1, characterized in that: Both the tail gas regulating valve (2) and the tail gas bypass valve (3) adopt electromagnetic regulating valves.