A device for separating components of sodium hydrosulfite in vacuum without interruption

Abstract

The utility model discloses a device of sodium hydrosulfite vacuum uninterrupted separation component, including lower storage tank and upper storage tank, and the liquid phase balance pipe and the gas phase balance pipe are connected between two storage tanks, the lower storage tank top connects the air inlet pipe and the first exhaust pipe, and the bottom is connected first output pipe, and the upper storage tank top connects the feeding pipe and the second exhaust pipe. The lower storage tank is equipped with a liquid level sensor, and the liquid phase balance pipe, the first output pipe and other key pipelines are equipped with solenoid valves, which are all linked with the control system. The double-tank structure realizes the discharge of methanol from the lower tank and the temporary storage in the upper tank, without the need to close the inlet pipeline, ensuring uninterrupted recovery. The pressurized design of carbon dioxide improves the discharge flow rate, and the linkage of the liquid level sensor automatically reduces the delay of discharge, effectively meeting the efficient recovery demand of methanol in sodium hydrosulfite production, and taking into account environmental protection and production continuity.

Description

Technical Field

[0001] This utility model relates to the technical field of component separation devices, and in particular to a device for continuous vacuum separation of components from sodium hydrosulfite. Background Technology

[0002] In the production process of sodium hydrosulfite, impurities need to be removed through methanol washing and filtration to improve product purity and chemical stability. Recovering the washed methanol reduces raw material consumption, saves production costs, and decreases wastewater discharge, making it a key optimization method in sodium hydrosulfite production that balances environmental value and economic benefits. In previous processes, to avoid cross-contamination, the condensate tank used to collect methanol from the drying tail gas required manual closure of all inlet valves during the pressurized drainage stage. This increased liquid flow resistance and affected production continuity. Summary of the Invention

[0003] The technical problem to be solved by this invention is that the internal methanol discharge rate is slow after the input pipe is closed.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a device for continuous vacuum separation of components of sodium hydrosulfite, including a lower storage tank and an upper storage tank, with a liquid phase balance pipe and a gas phase balance pipe connected between the upper and lower storage tanks, an air inlet pipe and a first exhaust pipe connected to the top of the lower storage tank, a first output pipe connected to the bottom of the lower storage tank, and a feeding pipe and a second exhaust pipe connected to the top of the upper storage tank.

[0005] Preferably, the air inlet pipe is connected to a carbon dioxide supply tank.

[0006] Preferably, a liquid level sensor is installed in the lower storage tank, and the liquid level sensor signal is connected to the control system. When the liquid level in the lower storage tank reaches a preset value, the control system controls the lower storage tank to automatically drain the liquid.

[0007] Preferably, electric valves are installed on the liquid phase balance pipe, the first output pipe, the first exhaust pipe, and the gas phase balance pipe, and all of them are electrically connected to the control system.

[0008] Preferably, safety valves are installed on the top of both the lower and upper storage tanks, and emergency shut-off valves are installed on the air inlet pipe, the first output pipe, the liquid phase balance pipe, and the gas phase balance pipe.

[0009] Preferably, a liquid phase solenoid valve is connected in series on the liquid phase balance pipe, and a gas phase solenoid valve is connected in series on the gas phase balance pipe. Both the liquid phase solenoid valve and the gas phase solenoid valve are electrically connected to the control system.

[0010] Preferably, pressure sensors are installed in both the lower and upper storage tanks, and the pressure sensor signals are connected to a pressure regulating system, which is electrically connected to the air inlet pipe, the first exhaust pipe, and the second exhaust pipe.

[0011] This invention provides a device for continuous vacuum separation of components from sodium hydrosulfite, which has the following beneficial effects.

[0012] 1. The system employs a combined upper and lower storage tank structure. When the lower storage tank is pressurized and drained, the newly generated condensed methanol from the drying tail gas can be temporarily stored in the upper storage tank without needing to shut off the inlet pipeline. After the lower storage tank has finished draining and reset, the methanol temporarily stored in the upper storage tank flows into the lower storage tank through the liquid phase balance pipe, completely solving the problem of valve closure and flow interruption in traditional processes. This ensures uninterrupted methanol recovery throughout the sodium hydrosulfite production process, meeting the requirements for continuous production operation.

[0013] 2. The air inlet pipe connected to the top of the lower storage tank is connected to the carbon dioxide supply tank. When pressurizing and draining, carbon dioxide can be introduced to form a stable pressure. With the help of the pressure inside the tank, the condensate is quickly pushed to the target storage tank, which increases the drainage flow rate. The liquid level sensor in the lower storage tank is linked with the control system. When the liquid level reaches the preset value, the drainage program is automatically started, eliminating the need for manual liquid level judgment, reducing drainage delay, and further optimizing methanol separation and transportation efficiency. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0015] In the diagram: 1. Lower storage tank; 2. Upper storage tank; 3. Feeding pipe; 4. Liquid phase balance pipe; 5. First output pipe; 6. Inlet pipe; 7. First exhaust pipe; 8. Second exhaust pipe; 9. Gas phase balance pipe. Detailed Implementation

[0016] like Figure 1 As shown, this utility model provides a device for continuous vacuum separation of components of sodium hydrosulfite, including a lower storage tank 1 and an upper storage tank 2. A liquid phase balance pipe 4 and a gas phase balance pipe 9 are connected between the upper storage tank 2 and the lower storage tank 1. An air inlet pipe 6 and a first exhaust pipe 7 are connected to the top of the lower storage tank 1. A first output pipe 5 is connected to the bottom of the lower storage tank 1. A feeding pipe 3 and a second exhaust pipe 8 are connected to the top of the upper storage tank 2.

[0017] The system adopts a combined upper and lower storage tank structure, and the specific operation process is as follows: 1. The condensed methanol in the drying tail gas first enters the upper storage tank 2 through a dedicated pipeline, and then flows into the lower storage tank 1 through the liquid phase balance pipe 4 at the bottom of the upper storage tank 2, completing the initial gas-liquid separation and condensate temporary storage.

[0018] 2. When the liquid level of the condensate in the lower storage tank 1 reaches the preset control value, the system automatically starts the conveying program. First, the liquid phase balance pipe 4 is closed to cut off the liquid phase channel between the lower storage tank 1 and the upper storage tank 2. At the same time, the system introduces carbon dioxide into the lower storage tank 1 to pressurize it, and pushes the condensate to the corresponding storage tank with the help of the pressure inside the tank.

[0019] 3. During the process of transporting condensate in the lower storage tank 1, the newly generated condensed methanol from the drying tail gas will be temporarily stored in the upper storage tank 2. During this stage, the upper storage tank 2 will always maintain a negative pressure operation state, which will not interfere with the stability of the entire production system.

[0020] After the condensate is transferred to the lower storage tank 1, a reset operation is performed: 1. First, stop the flow of carbon dioxide into the lower storage tank 1, and at the same time close the first output pipe 5 of the lower storage tank 1 to prevent the exhaust gas from being drawn back into the tank and contaminating the subsequent condensate.

[0021] 2. Open the first exhaust pipe 7 on the lower storage tank 1 to slowly release the residual pressure inside the tank and reduce the pressure inside the tank to normal pressure, so as to avoid the impact of sudden pressure drop on the tank body and pipeline.

[0022] 3. After the pressure in the lower storage tank 1 drops to normal, open the gas phase balance pipe 9 to gradually balance the internal pressure of the two tanks and eliminate the influence of the pressure difference on the valve opening.

[0023] 4. When the pressure sensor shows that the pressure of the two tanks is the same, the liquid phase balance pipe 4 is reopened, and the condensed methanol temporarily stored in the upper storage tank 2 enters the lower storage tank 1 again, completing the reset of the entire system and entering the next round of condensate collection cycle.

[0024] As a preferred embodiment of this utility model, the air inlet pipe 6 is connected to a carbon dioxide supply tank and is used to provide pressurized gas to the condensate in the lower storage tank 1 when the condensate level reaches a preset value, thereby pushing the condensate out through the first output pipe 5.

[0025] As a preferred embodiment of this utility model, a liquid level sensor is installed inside the lower storage tank 1. The liquid level sensor signal is connected to the control system. When the liquid level in the lower storage tank 1 reaches a preset value, the control system controls the lower storage tank 1 to automatically drain the liquid. When the liquid level sensor detects that the condensate level in the lower storage tank 1 has reached a preset control value, the control system automatically controls the closure of the liquid phase balance pipe 4 and starts the air inlet pipe 6 to introduce carbon dioxide into the lower storage tank 1. When it is detected that the condensate delivery in the lower storage tank 1 is completed and the liquid level drops to the set low liquid level value, the control system controls the cessation of carbon dioxide introduction and performs subsequent reset operations in sequence.

[0026] As a preferred embodiment of this utility model, electric valves are installed on the liquid phase balance pipe 4, the first output pipe 5, the first exhaust pipe 7, and the gas phase balance pipe 9, and are all electrically connected to the control system. When the condensate level in the lower storage tank 1 reaches the preset control value, the control system controls the liquid phase balance pipe 4 to close, the air inlet pipe 6 to open and introduce carbon dioxide, and at the same time opens the first output pipe 5 of the lower storage tank 1 to start conveying condensate; when the condensate conveying in the lower storage tank 1 is completed and the liquid level drops to the set low liquid level value, the control system controls the air inlet pipe 6 to stop introducing carbon dioxide, closes the outlet valve of the lower storage tank 1, and then opens the tail gas emission valve to release the residual pressure in the tank; when the tail gas emission valve detects that the pressure in the tank has dropped to normal pressure, the control system controls the opening of the gas phase balance pipe 9; when the pressure sensor detects that the pressure in the upper storage tank 2 and the lower storage tank 1 are the same, the control system controls the reopening of the liquid phase balance pipe 4.

[0027] As a preferred embodiment of this utility model, safety valves are installed on the top of both the lower storage tank 1 and the upper storage tank 2, and emergency shut-off valves are installed on the air inlet pipe 6, the first output pipe 5, the liquid phase balance pipe 4, and the gas phase balance pipe 9. When the pressure inside the tank exceeds the set safety pressure threshold, the safety valve automatically opens, releasing some gas to prevent the storage tank from exploding due to excessive pressure. When the system detects abnormal pressure, abnormal liquid level, leakage, or fire, the emergency shut-off valve automatically and quickly closes, cutting off the flow of materials and gas to ensure the safety of the equipment and personnel and prevent the accident from escalating further.

[0028] In a preferred embodiment of this utility model, a liquid phase solenoid valve is connected in series on the liquid phase balance pipe 4, and a gas phase solenoid valve is connected in series on the gas phase balance pipe 9. Both the liquid phase solenoid valve and the gas phase solenoid valve are electrically connected to the control system. When the level sensor detects that the condensate level in the lower storage tank 1 reaches a preset upper limit value, the controller automatically controls the liquid phase solenoid valve to close. When the level sensor detects that the condensate level in the lower storage tank 1 drops to a preset lower limit value, the controller automatically controls the gas phase solenoid valve to open, thereby achieving automatic control.

[0029] Pressure sensors are installed in both the lower tank 1 and the upper tank 2. The pressure sensor signals are connected to a pressure regulation system, which is electrically connected to the inlet pipe 6, the first exhaust pipe 7, and the second exhaust pipe 8. By controlling the amount of carbon dioxide introduced and the opening of the first exhaust pipe 7 and the second exhaust pipe 8, the pressure in the lower tank 1 and the upper tank 2 can be regulated. When the pressure sensor detects that the pressure in the lower tank 1 is too high, the control system controls the first exhaust pipe 7 to open, releasing some gas to reduce the pressure. When the pressure in the lower tank 1 is detected to be too low, the control system controls the inlet pipe 6 to increase the amount of carbon dioxide introduced, increasing the pressure inside the tank and ensuring that the device operates stably within a safe and suitable pressure range.

Claims

1. A device for continuous vacuum separation of components from sodium hydrosulfite, characterized in that: It includes a lower storage tank (1) and an upper storage tank (2). A liquid phase balance pipe (4) and a gas phase balance pipe (9) are connected between the upper storage tank (2) and the lower storage tank (1). An air inlet pipe (6) and a first exhaust pipe (7) are connected to the top of the lower storage tank (1). A first output pipe (5) is connected to the bottom of the lower storage tank (1). A feeding pipe (3) and a second exhaust pipe (8) are connected to the top of the upper storage tank (2).

2. The apparatus for continuous vacuum separation of components from sodium hydrosulfite as described in claim 1, characterized in that: The air inlet pipe (6) is connected to the carbon dioxide supply tank.

3. The apparatus for continuous vacuum separation of components from sodium hydrosulfite as described in claim 1, characterized in that: A liquid level sensor is installed inside the lower storage tank (1). The liquid level sensor signal is connected to the control system. When the liquid level in the lower storage tank (1) reaches the preset value, the control system controls the lower storage tank (1) to automatically drain the liquid.

4. The apparatus for continuous vacuum separation of components from sodium hydrosulfite as described in claim 3, characterized in that: Electric valves are installed on the liquid phase balance pipe (4), the first output pipe (5), the first exhaust pipe (7), and the gas phase balance pipe (9), and they are all electrically connected to the control system.

5. The apparatus for continuous vacuum separation of components from sodium hydrosulfite as described in claim 4, characterized in that: Safety valves are installed on the top of both the lower storage tank (1) and the upper storage tank (2), and emergency shut-off valves are installed on the air inlet pipe (6), the first output pipe (5), the liquid phase balance pipe (4), and the gas phase balance pipe (9).

6. The apparatus for continuous vacuum separation of components from sodium hydrosulfite as described in claim 5, characterized in that: A liquid phase solenoid valve is connected in series on the liquid phase balance tube (4), and a gas phase solenoid valve is connected in series on the gas phase balance tube (9). Both the liquid phase solenoid valve and the gas phase solenoid valve are electrically connected to the control system.

7. The apparatus for continuous vacuum separation of components from sodium hydrosulfite as described in claim 1, characterized in that: Pressure sensors are installed in both the lower tank (1) and the upper tank (2). The pressure sensor signals are connected to the pressure regulation system, which is electrically connected to the air inlet pipe (6), the first exhaust pipe (7), and the second exhaust pipe (8).

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