Tail gas treatment device for sedimentation tank

Abstract

The utility model relates to the technical field of tail gas treatment, in particular to a settling pond tail gas treatment device. The settling pond tail gas treatment device comprises a purification pipe, an activated carbon column for purifying tail gas is inserted into the purification pipe, an L-shaped branch pipe is fixedly mounted on the purification pipe, and a gas blocking valve group is mounted in the L-shaped branch pipe; an electrochemical sensor and an audible and visual alarm are arranged in the L-shaped branch pipe. According to the tail gas treatment device for the sedimentation tank, the air blocking valve group is matched with the steel ball through the spring A, opening and closing of the vent hole are automatically adjusted according to the air pressure in the purification pipe, stable operation of the system is ensured, and when the electrochemical sensor detects that the ammonia concentration exceeds the standard, the audible and visual alarm is immediately triggered; a worker can quickly close a butterfly valve or a ball valve on a tail gas exhaust pipeline of the sedimentation tank and immediately replace a new activated carbon column, so that the problem that the activated carbon cannot be replaced in time when the adsorption capacity of the activated carbon is saturated or the activated carbon is replaced when the adsorption capacity is not reached is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas treatment technical field especially relates to a sedimentation tank tail gas treatment device. BACKGROUND

[0002] The production process of gold extraction agent produces tail gas, which mainly contains particulate matter, ammonia and other substances, and must be treated before discharge. The traditional spray adsorption method is used to treat the solution to absorb ammonia and particulate matter, which can then be precipitated into a sedimentation tank. Then, a deodorizing agent is added to the sedimentation tank for odor control, which not only removes the odor in the tail gas but also avoids the generation of solid pollutants. However, there is still some residual tail gas (mainly ammonia) in the sedimentation tank. Currently, the gas generated is discharged to an adsorption box (which contains two or three activated carbon mesh plates) through a pipeline. The activated carbon mesh plates in the adsorption box need to be replaced at certain time intervals. Due to the fluctuation of ammonia concentration in the sedimentation tank, the activated carbon mesh plates may be saturated during replacement, resulting in the discharge of some ammonia without treatment. In some cases, the activated carbon mesh plates have not reached the adsorption capacity, resulting in waste of the adsorption capacity of the activated carbon mesh plates (i.e., the activated carbon is easily saturated or not fully utilized). In addition, manual monitoring of the replacement timing is lagging, which may cause secondary pollution or waste of activated carbon.

[0003] Therefore, it is necessary to provide a new sedimentation tank tail gas treatment device to solve the above technical problems. SUMMARY

[0004] To solve the above technical problems, the utility model provides a sedimentation tank tail gas treatment device.

[0005] The sedimentation tank tail gas treatment device provided by the utility model includes a purification pipe, one end of the purification pipe is fixedly installed with a fixed flange, and the other end of the purification pipe is provided with a threaded opening in the pipe opening;

[0006] An activated carbon column for purifying tail gas is inserted into the purification pipe, an L-shaped branch pipe is fixedly installed on the pipe body of the purification pipe near the threaded opening, an air vent and an expanded cavity are provided in the L-shaped branch pipe, a gas locking valve group is installed in the L-shaped branch pipe, the gas locking valve group includes a fixed frame, the fixed frame is fixedly installed in the L-shaped branch pipe, a sliding rod is slidably connected to the fixed frame, a steel ball and a spring A are fixedly installed on the sliding rod;

[0007] An electrochemical sensor is provided in the L-shaped branch pipe, and an audible and visual alarm electrically connected to the electrochemical sensor is fixedly installed outside the L-shaped branch pipe.

[0008] The vent hole and the flared cavity are preferably communicated with each other, the flared cavity is located between the vent hole and the L-shaped branch pipe outlet, the vent hole is away from the flared cavity and has a converging arc-shaped cavity opening, and the steel ball is abutted against the arc-shaped cavity opening by the spring A.

[0009] The spring A is preferably fixedly connected at one end to the inner wall of the fixed frame, and fixedly connected at the other end to the outer spherical surface of the steel ball.

[0010] The electrochemical sensor is preferably located in the flared cavity.

[0011] The threaded cover is preferably fixedly installed on the threaded opening in a threaded connection, and a press-fit rod for abutting against the activated carbon column is fixedly installed on the threaded cover.

[0012] The purification pipe preferably further comprises a middle connecting assembly, the middle connecting assembly comprises a fixed ring, the fixed ring is fixedly installed in the purification pipe and close to the fixed flange, a spring B is fixedly installed on the fixed ring, and an outer abutting ring is fixedly installed at the other end of the spring B.

[0013] Compared with the related art, the sedimentation tank tail gas treatment device has the following beneficial effects:

[0014] The lock valve group is automatically adjusted by the spring A and the steel ball to open and close the vent hole according to the air pressure in the purification pipe, to ensure stable operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view.

[0016] Figure 2 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view. Figure 1 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view.

[0017] Figure 3 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view. Figure 2 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view.

[0018] Figure 4 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view. Figure 2 A preferred embodiment of the sedimentation tank tail gas treatment device is shown in the structure schematic view.

[0019] The figure reference: 1, purification pipe; 11, fixed flange; 2, activated carbon column; 3, screw cap; 31, compression rod; 4, L-shaped branch pipe; 4a, air hole; 4b, flared cavity; 5, air lock valve group; 51, fixed frame; 52, sliding rod; 53, steel ball; 54, spring A; 6, electrochemical sensor; 7, audible and visual alarm; 8, threaded mouth; 9, middle connecting component; 91, fixed ring; 92, spring B; 93, outer abutting ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0021] The specific implementation of the utility model is described in detail below in combination with specific examples.

[0022] Please refer to Figures 1 to 4 The sedimentation tank tail gas treatment device provided by the utility model embodiment comprises a purification pipe 1, an activated carbon column 2 and an air lock valve group 5.

[0023] In the embodiment of the utility model, please refer to Figures 1 to 4 One end of the purification pipe 1 is fixedly provided with a fixed flange 11, and the other end of the purification pipe 1 is provided with a threaded mouth 8, the activated carbon column 2 for purifying tail gas is inserted into the purification pipe 1, a screw cap 3 is installed on the threaded mouth 8 in a threaded connection mode, a compression rod 31 for abutting the activated carbon column 2 is fixedly installed on the screw cap 3, and a middle connecting component 9 is further installed in the purification pipe 1, the middle connecting component 9 comprises a fixed ring 91, the fixed ring 91 is fixedly installed in the purification pipe 1 and close to the fixed flange 11, a spring B 92 is fixedly installed on the fixed ring 91, and the other end of the spring B 92 is fixedly provided with an outer abutting ring 93.

[0024] It should be noted that the fixed flange 11 is connected with the sedimentation tank tail gas exhaust pipeline by means of a screw, when the activated carbon column 2 is installed, the activated carbon column 2 is inserted into the purification pipe 1 from the threaded mouth 8, then the screw cap 3 is covered and screwed, the activated carbon column 2 is pushed into the purification pipe 1 by the compression rod 31, and the activated carbon column 2 compresses the spring B 92 through the outer abutting ring 93, at this time, the communication port of the L-shaped branch pipe 4 and the purification pipe 1 is located between the end of the activated carbon column 2 and the screw cap 3, so that the activated carbon column 2 can purify the tail gas;

[0025] When the activated carbon column 2 is replaced, after the screw cap 3 is unscrewed, a part of the column body of the activated carbon column 2 slides out of the purification pipe 1 under the elastic force of the spring B 92, so that the staff can quickly take out and replace the activated carbon column 2;

[0026] It is worth noting that the activated carbon column 2 in the application uses modified activated carbon, which is soaked in hydrochloric acid (HCl) or phosphoric acid (H3PO4) solution, heated to 60-100 DEG C, stirred for 2-6 hours, then filtered, washed to neutral, and dried (100-120 DEG C). In order to avoid the corrosion of the purification pipe 1, the purification pipe 1 can be internally lined with PTFE pipe or made of Hastelloy C276, and the staff should wear protective clothing and gloves when contacting the activated carbon column 2.

[0027] In the embodiment, a butterfly valve or a ball valve can be installed on the tail gas exhaust pipe of the sedimentation tank, and the butterfly valve or the ball valve is closed when the activated carbon column 2 is replaced.

[0028] In the embodiment of the utility model, please refer to Figures 1 to 4 , the L-shaped branch pipe 4 is fixedly installed on the pipe body close to the threaded port 8, the L-shaped branch pipe 4 is provided with a vent hole 4a and a flared cavity 4b, the vent hole 4a and the flared cavity 4b are communicated with each other, the flared cavity 4b is located between the vent hole 4a and the gas outlet pipe port of the L-shaped branch pipe 4, and the vent hole 4a is a converging arc-shaped cavity port away from the flared cavity 4b.

[0029] The L-shaped branch pipe 4 is provided with a gas locking valve group 5, the gas locking valve group 5 comprises a fixed frame 51 fixedly installed in the L-shaped branch pipe 4, a sliding rod 52 slidably inserted on the fixed frame 51, a steel ball 53 fixedly installed on the sliding rod 52 and a spring A 54 sleeved thereon, one end of the spring A 54 is fixedly connected with the inner wall of the fixed frame 51, the other end of the spring A 54 is fixedly connected with the outer spherical surface of the steel ball 53, and the steel ball 53 abuts against the arc-shaped cavity port through the spring A 54.

[0030] The L-shaped branch pipe 4 is provided with an electrochemical sensor 6, and the electrochemical sensor 6 is located in the flared cavity 4b, and the L-shaped branch pipe 4 is fixedly installed outside the pipe and is electrically connected with the sound-light alarm 7.

[0031] It should be noted that when the tail gas after purification of the activated carbon column 2 enters the purification pipe 1, the converging arc-shaped cavity port of the vent hole 4a is blocked by the steel ball 53 due to the elastic force of the spring A 54, when the gas pressure in the purification pipe 1 is greater than the elastic force of the spring A 54, the steel ball 53 slides along the fixed frame 51 to the flared cavity 4b with the sliding rod 52, at this time, the purified gas can be discharged from the purification pipe 1, therefore, the gas locking valve group 5 automatically adjusts the opening and closing of the vent hole 4a according to the gas pressure in the purification pipe 1 through the cooperation of the spring A 54 and the steel ball 53, and the stable operation of the system is ensured.

[0032] If the activated carbon column 2 is saturated and it is difficult to neutralize ammonia, when the electrochemical sensor 6 in the flared cavity 4b detects that the ammonia concentration exceeds the standard, the audible and visual alarm 7 triggers a quick warning, so that the staff quickly closes the butterfly valve or ball valve on the tail gas exhaust pipe of the sedimentation tank, reduces the amount of untreated tail gas leakage, and immediately replaces the new activated carbon column 2, thereby effectively solving the problem of saturation of the activated carbon adsorption capacity and failure to replace it in time or replacement of the activated carbon before the adsorption capacity is reached.

[0033] The electrochemical sensor 6 and the audible and visual alarm 7 circuit and control in the utility model are prior art, and will not be described in detail here.

[0034] In the present application, the electrochemical sensor 6 needs to be calibrated and maintained regularly.

[0035] The above is only an embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A sedimentation tank tail gas treatment device, comprising a purification pipe (1), one end of the purification pipe (1) is fixedly provided with a fixed flange (11), and the other end of the purification pipe (1) is provided with a threaded opening (8) in the pipe opening, characterized in that: an activated carbon column (2) for purifying tail gas is inserted in the purification pipe (1), an L-shaped branch pipe (4) is fixedly installed on the pipe body of the purification pipe (1) close to the threaded opening (8), the L-shaped branch pipe (4) is provided with a vent hole (4a) and an expanded hole (4b), a gas locking valve group (5) is installed in the L-shaped branch pipe (4), the gas locking valve group (5) comprises a fixed frame (51) fixedly installed in the L-shaped branch pipe (4), a sliding rod (52) slidably connected is inserted on the fixed frame (51), a steel ball (53) is fixedly installed on the sliding rod (52), and a spring A (54) is sleeved on the sliding rod (52); an electrochemical sensor (6) is arranged in the L-shaped branch pipe (4), and an audible and visual alarm (7) electrically connected with the electrochemical sensor (6) is fixedly installed outside the L-shaped branch pipe (4).

2. The lagoon off-gas treatment apparatus of claim 1, wherein, The vent hole (4a) and the expanded hole (4b) are in communication with each other, the expanded hole (4b) is located between the vent hole (4a) and the gas outlet pipe opening of the L-shaped branch pipe (4), the opening of the vent hole (4a) away from the expanded hole (4b) is a converging arc-shaped opening, and the steel ball (53) abuts against the arc-shaped opening through the spring A (54).

3. The lagoon off-gas treatment apparatus of claim 1, wherein, One end of the spring A (54) is fixedly connected with the inner wall of the fixed frame (51), and the other end of the spring A (54) is fixedly connected with the outer spherical surface of the steel ball (53).

4. The lagoon off-gas treatment apparatus of claim 2, wherein, The electrochemical sensor (6) is located in the expanded hole (4b).

5. The lagoon off-gas treatment apparatus of claim 1, wherein, A threaded cover (3) is threadedly connected on the threaded opening (8), and a press-fit rod (31) for abutting against the activated carbon column (2) is fixedly installed on the threaded cover (3).

6. The lagoon off-gas treatment apparatus of claim 5, wherein, A middle connecting assembly (9) is further installed in the purification pipe (1), the middle connecting assembly (9) comprises a fixed ring (91) fixedly installed in the purification pipe (1) and close to the fixed flange (11), a spring B (92) is fixedly installed on the fixed ring (91), and an outer abutting ring (93) is fixedly installed at the other end of the spring B (92).

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