Negative pressure defoaming device of desulfurizing liquid foam tank

Abstract

The utility model discloses a desulfurization liquid foam tank negative pressure defoaming device which comprises a defoaming box and a vortex fan, one side of the bottom of the defoaming box is connected with a desulfurization regeneration tower through a liquid inlet pipe, and the other side of the bottom of the defoaming box is connected with a foam tank through a liquid discharge pipe. An air inlet of the vortex fan is connected with an air outlet hole in the top of the defoaming box through an air inlet pipe, an air outlet of the vortex fan is connected with a negative pressure tail gas pipeline through an air outlet pipe, and valves are arranged on the liquid discharge pipe, the air inlet pipe and the liquid inlet pipe. The defoaming box disclosed by the utility model is arranged between the desulfurization regeneration tower and the foam tank, bubbles at the upper part of foam liquid entering the defoaming box are broken by utilizing negative pressure and centrifugal force generated by the vortex fan, and the defoamed foam liquid enters the foam tank, so that the influence on the operation precision caused by a large amount of accumulated foams in the foam tank can be avoided, and the field operation environment is effectively improved.

Description

Technical Field

[0001] This utility model relates to a negative pressure defoaming device for the foam tank of desulfurization liquid used in the HPF wet gas desulfurization process of coking plants, and belongs to the technical field of coking equipment. Background Technology

[0002] In the HPF wet gas desulfurization process of coking plants, the desulfurization foam liquid enters the foam tank directly from the top of the desulfurization regeneration tower, resulting in a large amount of foam accumulating in the foam tank. This makes it difficult to observe the liquid level in the foam tank and may even cause foam overflow, seriously polluting the on-site operating environment. Therefore, it is essential to design a device that can effectively eliminate foam in the foam tank. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a negative pressure defoaming device for desulfurization liquid foam tanks, thereby preventing the accumulation of large amounts of foam in the foam tanks and improving the on-site operating environment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A desulfurization liquid foam tank negative pressure defoaming device includes a defoaming box and a vortex blower. One side of the bottom of the defoaming box is connected to the desulfurization regeneration tower through a liquid inlet pipe, and the other side of the bottom of the defoaming box is connected to the foam tank through a liquid drain pipe. The air inlet of the vortex blower is connected to the air outlet at the top of the defoaming box through an air inlet pipe, and the air outlet is connected to the negative pressure exhaust gas pipeline through an air outlet pipe. Valves are provided on the liquid drain pipe, the air inlet pipe, and the liquid inlet pipe.

[0006] The aforementioned desulfurization liquid foam tank negative pressure defoaming device has a defoaming plate inside the defoaming box, which divides the inner cavity of the defoaming box into upper and lower chambers, and has multiple through holes distributed on the defoaming plate.

[0007] In the aforementioned desulfurization liquid foam tank negative pressure defoaming device, the end of the air outlet pipe away from the vortex blower is raised upwards, and a return liquid pipe is connected to the lowest point of the air outlet pipe. The lower end of the return liquid pipe passes through the top plate and defoaming plate of the defoaming box and is inserted into the foam liquid inside the defoaming box. A return liquid valve is installed on the return liquid pipe.

[0008] The aforementioned desulfurization liquid foam tank negative pressure defoaming device has a vertical buffer plate at the bottom of the defoaming tank, which is located between the inlet pipe and the outlet pipe.

[0009] The aforementioned desulfurization liquid foam tank negative pressure defoaming device has a negative pressure gauge installed on the top of the defoaming box.

[0010] The aforementioned desulfurization liquid foam tank negative pressure defoaming device has an inverted U-shaped bend in the drain pipe.

[0011] The aforementioned desulfurization liquid foam tank negative pressure defoaming device has a liquid level gauge installed on the side wall of the defoaming tank.

[0012] The aforementioned desulfurization liquid foam tank negative pressure defoaming device has a vent pipe at the bottom of the defoaming tank, and a vent valve is installed on the vent pipe.

[0013] In the aforementioned desulfurization liquid foam tank negative pressure defoaming device, the defoaming plate is connected to the side wall of the defoaming box via lower and upper supports. The lower supports are welded to the side wall of the defoaming box, the defoaming plate is placed on the lower supports, and the upper supports are pressed onto the defoaming plate and fixedly connected to the lower supports via fixing bolts.

[0014] The defoaming box of this invention is installed between the desulfurization regeneration tower and the foam tank. It uses the negative pressure and centrifugal force generated by the vortex blower to break the bubbles on the top of the foam liquid entering the defoaming box. The defoamed foam liquid then enters the foam tank, which can avoid the large amount of foam accumulating in the foam tank and affecting the operational accuracy, and effectively improve the on-site operating environment. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a structural diagram of the defoaming board.

[0018] The following are the labels in the diagram: 1. Drain pipe, 2. Defoaming box, 3. Return pipe, 4. Air outlet pipe, 5. Vortex fan, 6. Air inlet pipe, 7. Defoaming plate, 8. Level gauge, 9. Inlet pipe, 10. Vent pipe, 11. Lower support lug, 12. Upper support lug, 13. Through hole, 14. Fixing bolt, 15. Buffer plate, 16. Return valve, 17. Negative pressure gauge, 18. Vent valve. Detailed Implementation

[0019] See Figure 1 and Figure 2 This utility model mainly includes a drain pipe 1, a defoaming box 2, a return pipe 3, an air outlet pipe 4, a vortex fan 5, an air inlet pipe 6, a defoaming plate 7, a level gauge 8, an inlet pipe 9, a vent pipe 10, a lower support ear 11, an upper support ear 12, a through hole 13, a fixing bolt 14, a buffer plate 15, a return valve 16, a negative pressure gauge 17, and a vent valve 18.

[0020] The inlet pipe 9 and the outlet pipe 1 are welded to the bottom sides of the sealed defoaming box 2. The other end of the inlet pipe 9 is connected to the desulfurization regeneration tower, and the other end of the outlet pipe 1 is connected to the foam tank. The outlet pipe 1 is equipped with an inverted U-shaped bend to ensure that the liquid in the defoaming box 2 can only flow out after accumulating to a certain height, thus reducing foam entrainment during the initial liquid discharge. A vertical buffer plate 15 is welded to the bottom of the defoaming box 2. The buffer plate 15 is located between the inlet pipe 9 and the outlet pipe 1. It acts as a barrier to the foam liquid entering the defoaming box 2 through the inlet pipe 9, preventing it from rushing out directly from the outlet pipe 1 and prolonging the separation time of the foam in the defoaming box 2.

[0021] A defoaming plate 7 is installed on the lower part of the top plate of the defoaming box 2. The defoaming plate 7 divides the inner cavity of the defoaming box 2 into upper and lower chambers. Multiple through holes 13 are distributed on the defoaming plate 7. When a large number of bubbles below the defoaming plate 7 reach the top of the defoaming plate 7 through the through holes 13, the bubbles are broken or decomposed into smaller bubbles. The defoaming plate 7 is connected to the side wall of the defoaming box 2 by the lower support ears 11 and the upper support ears 12. The lower support ears 11 are welded to the side wall of the defoaming box 2. The defoaming plate 7 is placed on the lower support ears 11, and the upper support ears 12 are pressed on the defoaming plate 7 and fixedly connected to the lower support ears 11 by fixing bolts 14 to prevent the defoaming plate 7 from being lifted by the foam liquid.

[0022] A visual level gauge 8 is installed on the side wall of the defoaming box 2, and the liquid level height is set. The air inlet of the vortex blower 5 is connected to the air outlet at the top of the defoaming box 2 through the air inlet pipe 6, and the air outlet is connected to the negative pressure exhaust gas pipeline (owned by the factory) through the air outlet pipe 4. The upper end of the return pipe 3 is connected to the lowest point of the air outlet pipe 4, and the lower end passes through the top plate and defoaming plate 7 of the defoaming box 2 and is inserted into the foam liquid in the defoaming box 2. The lower end of the return pipe 3 is lower than the liquid level of the level gauge 8 to prevent the vortex blower 5 from blowing air into the defoaming box 2 through the air outlet pipe 4 and the return pipe 3, thus forming bubbles. The end of the air outlet pipe 4 away from the vortex blower 5 is raised upward to ensure that the foam liquid in the air outlet pipe 4 is returned to the defoaming box 2 by the return pipe 3. The return valve 16 is installed on the return pipe 3.

[0023] A negative pressure gauge 17 is also installed on the top of the defoaming chamber 2 to observe the air pressure inside the defoaming chamber 2. A vent pipe 10 is welded to the bottom of the defoaming chamber 2, and a vent valve 18 is installed on the vent pipe 10.

[0024] During operation, the foam liquid in the desulfurization regeneration tower is introduced into the defoaming tank 2 through the inlet pipe 9. The valve on the drain pipe 1 (not shown in the figure) is closed, and the vortex blower 5 is turned on. The upper part of the inner cavity of the defoaming tank 2 is under negative pressure. The bubbles below the defoaming plate 7 are sucked up to the top of the defoaming plate 7 through the through hole 13, becoming smaller bubbles or bursting. The unbroken small bubbles enter the vortex blower 5 through the air inlet pipe 6 and burst under the action of negative pressure and centrifugal force of the vortex blower 5, thereby achieving defoaming. The liquid level in the defoaming tank 2 is observed through the level gauge 8. When the liquid level reaches the set requirement, the valve on the drain pipe 1 is quickly opened to allow the liquid in the defoaming tank 2 to flow into the foam tank through the drain pipe 1. The liquid flow rate in the drain pipe 1 is adjusted or controlled according to the value displayed by the negative pressure gauge 17 on the top of the defoaming tank 2 to stabilize the liquid level in the defoaming tank 2. Then, the return valve 16 on the return pipe 3 is opened to allow the liquid accumulated in the air outlet pipe 4 to flow into the defoaming tank 2, preventing excessive liquid accumulation in the air outlet pipe 4 from affecting the exhaust.

[0025] When the device is under maintenance, close the valves on the inlet pipe 9, outlet pipe 1, and air outlet pipe 6 (not shown in the figure), stop the vortex blower 5, open the vent valve 18 on the vent pipe 10, and empty the liquid in the sealed defoaming box 2. Then, remove the top sealing cover of the defoaming box (not shown) for internal cleaning and maintenance.

Claims

1. A negative pressure defoaming device for a desulfurization liquid foam tank, characterized in that, The device includes a defoaming box (2) and a vortex blower (5). One side of the bottom of the defoaming box (2) is connected to the desulfurization regeneration tower through a liquid inlet pipe (9), and the other side of the bottom of the defoaming box (2) is connected to the foam tank through a drain pipe (1). The air inlet of the vortex blower (5) is connected to the air outlet at the top of the defoaming box (2) through an air inlet pipe (6), and the air outlet is connected to the negative pressure exhaust gas pipeline through an air outlet pipe (4). Valves are provided on the drain pipe (1), the air inlet pipe (6), and the liquid inlet pipe (9).

2. The negative pressure defoaming device for a desulfurization liquid foam tank according to claim 1, characterized in that, The defoaming box (2) is equipped with a defoaming plate (7), which divides the inner cavity of the defoaming box (2) into upper and lower cavities. Multiple through holes (13) are distributed on the defoaming plate (7).

3. The negative pressure defoaming device for a desulfurization liquid foam tank according to claim 2, characterized in that, The end of the air outlet pipe (4) away from the vortex fan (5) is raised upwards, and the lowest point of the air outlet pipe (4) is connected to the return pipe (3). The lower end of the return pipe (3) passes through the top plate and the defoaming plate (7) of the defoaming box (2) and is inserted into the foam liquid in the defoaming box (2). A return valve (16) is installed on the return pipe (3).

4. A negative pressure defoaming device for a desulfurization liquid foam tank according to any one of claims 1-3, characterized in that, The bottom of the defoaming box (2) is provided with a vertical buffer plate (15), which is located between the liquid inlet pipe (9) and the liquid outlet pipe (1).

5. The desulfurization liquid foam tank negative pressure defoaming device according to claim 4, characterized in that, A negative pressure gauge (17) is installed on the top of the defoaming box (2).

6. The negative pressure defoaming device for a desulfurization liquid foam tank according to claim 5, characterized in that, The drain pipe (1) is provided with an inverted U-shaped bend.

7. The negative pressure defoaming device for a desulfurization liquid foam tank according to claim 6, characterized in that, A level gauge (8) is installed on the side wall of the defoaming box (2).

8. The negative pressure defoaming device for a desulfurization liquid foam tank according to claim 7, characterized in that, The bottom of the defoaming box (2) is provided with a vent pipe (10), and a vent valve (18) is installed on the vent pipe (10).

9. The negative pressure defoaming device for a desulfurization liquid foam tank according to claim 3, characterized in that, The defoaming plate (7) is connected to the side wall of the defoaming box (2) by the lower support (11) and the upper support (12). The lower support (11) is welded to the side wall of the defoaming box (2). The defoaming plate (7) is placed on the lower support (11). The upper support (12) is pressed on the defoaming plate (7) and fixedly connected to the lower support (11) by the fixing bolt (14).

Images