Overflow valve and oil removal tank provided with overflow valve

Abstract

The overflow valve comprises a valve body and a valve seat, the valve body is connected to the valve seat in a threaded mode, liquid outlets are formed in the valve body and the valve seat, and when the two liquid outlets directly face each other, the liquid outlet amount is maximum; an overflow opening is further formed in the valve body and located above the liquid outlet. In the production process, due to the fact that more impurities exist in an upper-layer solution in the oil removal tank, an overflow pipeline is often blocked when not monitored by personnel in time, after the overflow pipeline is blocked, the liquid level of the solution in the oil removal tank continues to rise, and when the overflow pipeline reaches a certain height, the redundant solution can overflow from the overflow valve based on the communicating vessel principle, and the occurrence of tank overflowing accidents is eradicated. And safe and normal production is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hydrometallurgy, and particularly relates to an overflow valve and an oil removal tank provided with the overflow valve. BACKGROUND

[0002] In the hydrometallurgy industry, since industrial raw materials contain oil and impurities, in order to reduce the impurity content of the final product and improve the performance of the product, the raw materials need to go through processes such as oil removal and filtration after being dissolved before entering the synthesis process. The conventional oil removal device is to let the solution flow in from one end of the tank, and the oil naturally floats on the solution due to the density difference, and then the solution flows out from the bottom of the other end of the tank. Since the oil-containing solution has complex components, there are a large amount of floating substances in the upper solution, and the floating substances can block the overflow pipeline of the oil removal tank, causing the liquid level in the oil removal tank to continuously rise and causing the tank to overflow. In order to avoid such accidents, a person usually stands by the oil removal tank to monitor the inflow and outflow of the oil removal tank at any time, and once the inflow and outflow are unbalanced, the valve is used to intervene in the inflow and outflow of the oil removal tank to avoid the tank from overflowing, which is time-consuming and laborious. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses an overflow valve and an oil removal tank provided with the overflow valve to solve the problem of frequent tank overflow accidents of the existing oil removal tank.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] An overflow valve comprises a valve body and a valve seat, the valve body is threadedly connected to the valve seat, liquid outlets are formed in the valve body and the valve seat, and the liquid outlet has the maximum flow when the two liquid outlets face each other; and an overflow port is further formed in the valve body and located above the liquid outlet.

[0006] The gap between the valve body and the valve seat is 0.1-1 mm, facilitating rotation, and as the diameter of the overflow pipeline increases, the gap between the valve body and the valve seat gradually increases, and the maximum gap is 1 mm.

[0007] The liquid outlet in the valve body can be marked with a flow scale according to experience, so that the overflow solution flow can be observed in real time.

[0008] An oil removal tank provided with an overflow valve, the oil removal tank is internally provided with a buffer pool, a separation pool and a liquid discharge pool, the buffer pool is arranged on the left side of the separation pool, an oil-containing solution inlet pipe is connected to the bottom of the buffer pool, and an overflow port is arranged on the top of the buffer pool; an oil overflow pool is further arranged on the top of the separation pool, the upper edge of the oil overflow pool is higher than the height of the overflow port, and an oil discharge pipe is further connected to the oil overflow pool; an overflow pipe is arranged in the liquid discharge pool, one end of the overflow pipe is connected to the bottom of the separation pool, the other end of the overflow pipe is provided with the overflow valve, the installation height of the overflow valve does not exceed the upper edge of the liquid discharge pool, and a liquid discharge pipe is further connected to the bottom of the liquid discharge pool.

[0009] The utility model has the advantages of the following beneficial effects:

[0010] In the production process, the upper layer solution in the oil removal groove has many sundries, and the overflow pipeline is often blocked if the personnel monitoring is not timely. After the overflow pipeline is blocked, the solution level in the oil removal groove continues to rise, and when reaching a certain height, the excess solution is overflowed from the overflow valve based on the principle of communicating vessel, so as to prevent the tank overflow accident and ensure the normal production safety. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The utility model discloses an overflow valve's split structure schematic drawing.

[0012] Figure 2 The utility model discloses an oil removal groove structure schematic drawing with the overflow valve.

[0013] In the drawing, 1-valve body, 2-valve seat, 3-liquid outlet, 4-overflow port, 5-buffer pool, 6-separation pool, 7-liquid discharge pool, 8-oil-containing solution inlet pipe, 9-overflow port, 10-oil overflow pool, 11-oil discharge pipe, 12-overflow pipe, 13-liquid discharge pipe, 14-overflow valve. DETAILED DESCRIPTION

[0014] The utility model will be further explained in connection with the drawings and examples.

[0015] Example 1

[0016] 1, the solution containing solution is removed by extraction, and enters the next process to remove oil, at this time, the oil in the solution is organic oil entrained during extraction, and the oil has emulsification and caking phenomenon as the solution temperature reduces;

[0017] 2, the oil removal process is carried out by the clarification oil removal mode, the oil removal groove is 6 meters long, 2 meters wide and 2 meters high, and the effective volume is about 20m 3 ; the oil removal groove is divided into a buffer pool 5, a separation pool 6 and a liquid discharge pool 7, the buffer pool 5 is arranged on the left side of the separation pool 6, the buffer pool 5 is connected with an oil-containing solution inlet pipe 8 at the bottom, and the buffer pool 5 is provided with an overflow port 9 at the top; the separation pool 6 is further provided with an oil overflow pool 10, and the height of the upper edge of the oil overflow pool 10 is higher than the height of the overflow port 9; the oil overflow pool 10 is further connected with an oil discharge pipe 11; the liquid discharge pool 7 is provided with an overflow pipe 12, one end of the overflow pipe 12 is connected with the bottom of the separation pool 6, and the other end is provided with an overflow valve, and the installation height of the overflow valve does not exceed the upper edge of the liquid discharge pool 7; the bottom of the liquid discharge pool 7 is further connected with a liquid discharge pipe 13. The whole groove body includes a PVC discharge liquid pipe, the flow rate of the solution in the oil removal groove is less than or equal to 5m / h, and the residence time of the solution in the oil removal groove is greater than 1 hour.

[0018] 3. The total length of the overflow valve is 440 mm, wherein the valve body 1 is 440 mm long, the valve seat 2 is 300 mm long, the liquid outlet 3 is 150x70 mm in size, and when the valve body 1 and the valve seat 2 are completely aligned with the liquid outlet 3, the valve body scale is marked from low to high, representing a flow rate of 3 m 3 / h, 6 m 3 / h, 9 m 3 / h, 12 m 3 / h, and the maximum allowable oil removal flow rate of the oil removal tank is 12 m 3 / h, and the optimal oil removal flow rate is 6 m 3 / h.

[0019] Actual operation:

[0020] 1) Inject the solution into the oil removal tank at a rate of 6 m 3 / h, and after about 3.5 hours, the liquid outlet starts to discharge, the actual residence time of the solution in the oil removal tank is between 1.5-2 h, which meets the oil removal requirements;

[0021] 2) The current oil content of the oil removal tank is about 80 mg / L, the total solution processing capacity is 120 m 3 / d, and the total oil content of the solution is about 9.6 kg, and the cumulative oil film thickness is about 1 mm per day.

[0022] During production, the valve seat and the valve body are completely aligned with the liquid outlet, at which time the liquid discharge rate can reach the maximum, and when the liquid level reaches the middle of the valve body liquid outlet, the liquid discharge rate reaches 6 m 3 / h, at which time the separation tank liquid level is about 5 cm lower than the upper edge of the oil overflow tank, at which time only liquid is discharged without oil, the oil removal tank processes 120 m 3 of solution per day for 24 hours, and the oil film thickness on the surface of the oil removal tank solution increases by about 1 mm, and oil is discharged every two weeks, and after two weeks, the cumulative oil layer thickness reaches 15 mm, and the volume reaches 0.18 m 3 , at which time the rotating valve body is adjusted to make the inlet flow rate greater than the overflow rate, and here the overflow ratio is adjusted to 6:4, the inlet flow rate is 6 m 3 / h, and the liquid discharge rate is 4 m 3 / h, the liquid level of the oil removal tank gradually rises, and after a period of time, the floating oil enters the oil overflow tank and starts to discharge oil, the opening of the adjusting valve on the oil discharge pipe can be adjusted according to personal experience to adjust the oil discharge rate, the slower the oil discharge rate, the larger the oil liquid ratio, and the smaller the solution loss. Due to the presence of a large amount of solid floating matter in the solution, the oil overflow tank and the oil discharge pipeline are often blocked during the oil discharge process. Once the oil overflow tank and the oil discharge pipeline are blocked, the overall liquid level of the oil removal tank rises, and when the liquid level rises above 90 mm, the qualified solution at the bottom of the oil removal tank (separation tank) that cannot be discharged from the overflow valve liquid outlet can be overflowed from the overflow port at the upper part of the overflow valve, ensuring that the liquid level of the oil removal tank does not rise any further, and production can still proceed smoothly, avoiding the occurrence of a tank overflow.

Claims

1. An overflow valve, characterized in that, It includes a valve body (1) and a valve seat (2). The valve body (1) is threaded onto the valve seat (2). Both the valve body (1) and the valve seat (2) have liquid outlets (3), and the liquid output is maximized when the two liquid outlets are facing each other. The valve body (1) also has an overflow port (4), which is located above the liquid outlet (3).

2. The overflow valve as described in claim 1, characterized in that, The inner diameter of the valve body (1) is 0.1~1mm larger than the outer diameter of the valve seat (2).

3. An oil removal tank equipped with the overflow valve of claim 1, characterized in that, The oil removal tank is equipped with a buffer tank (5), a separation tank (6) and a drain tank (7). The buffer tank (5) is located on the left side of the separation tank (6), and the bottom of the buffer tank (5) is connected to an oil-containing solution inlet pipe (8). The top of the buffer tank (5) is equipped with an overflow port (9). The top of the separation tank (6) is also equipped with an oil overflow tank (10), and the upper edge of the oil overflow tank (10) is higher than the height of the overflow port (9). The oil overflow tank (10) is also connected to an oil drain pipe (11). The drain tank (7) is equipped with an overflow pipe (12). One end of the overflow pipe (12) is connected to the bottom of the separation tank (6), and the other end is equipped with an overflow valve. The installation height of the overflow valve does not exceed the upper edge of the drain tank (7). The bottom of the drain tank (7) is also connected to a drain pipe (13).

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