Device for filtering and recovering discharged sand of reactor

Abstract

The utility model discloses a filter recovery device for discharged sand of a reactor, which comprises a box body, a partition plate overflow weir arranged at the bottom of the box body, a sand box arranged on one side of the partition plate overflow weir, a water tank arranged on the other side of the partition plate overflow weir, a liquid outlet pipeline arranged at the upper part of the water tank, a liquid inlet pipeline arranged on one side of the sand box, and a sand recovery pipeline arranged on the other side of the sand box, a flushing pipe is arranged at the bottom of the sand box and extends into the sand box, and a water outlet hole is formed in the lower side of the flushing pipe. Compared with the prior art, the sand discharging and conveying process of the reactor is optimized, primary crude brine and mud sand can be effectively separated, the influence of the mud sand on follow-up equipment is eliminated, primary crude brine can be recycled to the maximum extent, material waste is eliminated, and meanwhile intelligent analysis and automatic flushing water recycling can be achieved. The flushing pipe is communicated into the sand box, so that the flushing effect is better, and no mud and sand are accumulated in the sand box.

Description

Technical Field

[0001] The utility model relates to the technical field of chlor-alkali production, in particular to a sand discharging, filtering and recycling device for a reactor. Background Art

[0002] The primary crude brine prepared by the salt dissolving system in the brine workshop of the soda ash company is sent to the primary refining reactor for refining treatment. During the production process of primary brine refining, milk of lime needs to be added into the reactor for magnesium removal reaction. The crude brine and the milk of lime enter the reactor from the lower part of the reactor. Due to the influence of mud and sand in sea salt, sundries and gravel in the milk of lime, the reactor needs to discharge sand regularly to avoid the accident of stirring stop. The primary crude brine mixed with mud and sand realizes solid-liquid separation under the stirring action of the reactor, and the liquid part overflows from the top of the reactor. Since the elevation difference between the liquid level of the reactor and the surface level of the clarification tank is about 3.5 meters, the solid part is discharged into the liquid inlet sleeve of the No. 4 clarification tank in a self-pressure form through the sand discharging pipeline at the pointed bottom of the reactor by using the pressure difference. The mud and sand enter the mud washing barrel and the pressure filtration process together with the primary salt mud, and finally form a salt mud filter cake. Due to the poor fluidity of the mud and sand materials, a series of accidents such as blockage of the sludge discharging pipeline of the clarification tank, blockage of the inlet and outlet mud pipelines of the mud washing barrel, and stop of the stirring speed reducer of the mud washing barrel are likely to occur. Therefore, the primary salt mud.

[0003] Patent CN217188377U discloses a chlor-alkali chemical salt mud separation device. The concentrated liquid enters the sedimentation tank for sedimentation to realize the separation of salt mud and brine. The outlet of the flushing pipeline of the separation device is located at the bottom of the sedimentation tank and is used for stirring the slag slurry to prevent the slag slurry from aggregating into a pile. However, in the actual use process, there are dead corners in the sedimentation tank and the effect is poor. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a sand discharging, filtering and recycling device for a reactor, which optimizes the mud and sand conveying process in the original sand discharging process of the reactor. By adding a filtering and recycling device, the purpose of effectively separating the primary crude brine and the mud and sand in the sand discharging process is achieved, the influence of the reactor sand discharging on the subsequent production operations of the clarification tank and the mud washing barrel is eliminated, and it has the functions of intelligent analysis of flushing water and automatic control.

[0005] To achieve this technical purpose, the utility model adopts the following scheme:

[0006] A sand discharging, filtering and recycling device for a reactor includes a box body. A partition overflow weir is arranged at the bottom of the box body. One side of the partition overflow weir is a sand box, and the other side of the partition overflow weir is a water tank. An outlet pipeline is arranged at the upper part of the water tank. An inlet pipeline is arranged on one side of the sand box. A mud and sand recovery pipeline is arranged on the other side of the sand box. A flushing water pipe is arranged at the bottom of the sand box. The flushing water pipe penetrates into the interior of the sand box, and water outlet holes are formed on the lower side of the flushing water pipe.

[0007] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0008] The present utility model optimizes the sand discharging and conveying process of the reactor, which can not only effectively separate the primary crude brine from the mud and sand, eliminate the influence of the mud and sand on the subsequent equipment, but also recover the primary crude brine to the greatest extent, eliminate material waste, and at the same time can perform intelligent analysis and automatic flushing recovery. The flushing pipe is led into the sand box, and the flushing effect is better, and there is no mud and sand accumulation in the sand box.

[0009] Furthermore, the liquid inlet pipeline is connected to the sand discharging pipeline of the reactor, pneumatic valves are arranged on both the sand discharging pipeline and the mud and sand recovery pipeline, a solenoid valve is arranged on the flushing pipe, a level gauge is arranged in the sand box, and the level gauge is interlocked with the pneumatic valve and the solenoid valve. The DCS control system is introduced to form intelligent flushing and automatic control, reducing the labor intensity of the operators.

[0010] Furthermore, the ratio of the height of the baffle overflow weir to the height of the box body is (0.5~0.8):1. Description of the Drawings

[0011] Figure 1 It is the front view of the reactor sand discharging, filtering and recovering device in the embodiment of the present utility model;

[0012] Figure 2 It is the left view of the reactor sand discharging, filtering and recovering device in the embodiment of the present utility model;

[0013] Figure 3 It is the top view of the reactor sand discharging, filtering and recovering device in the embodiment of the present utility model;

[0014] Figure 4 It is the sectional view at the water outlet hole of the flushing pipe in the embodiment of the present utility model;

[0015] The labels in the figure are: 1. Box body; 101. Sand box; 102. Water tank; 2. Baffle overflow weir; 3. Liquid inlet pipeline; 4. Liquid outlet pipeline; 5. Mud and sand recovery pipeline; 6. Flushing pipe. Detailed Embodiments

[0016] In order to fully understand the purpose, features and effects of the present utility model, the present utility model will be described in detail through the following specific embodiments, but the present utility model is not limited thereto.

[0017] See Figures 1 to 4, the present utility model provides a technical solution: a reactor sand discharging, filtering and recycling device, which includes a box body 1. The box body 1 is a cuboid storage tank with a width of 1 m, a length of 1.5 m and a height of 0.5 m. A partition overflow weir 2 is provided at the bottom of the box body 1. On one side of the partition overflow weir 2 is a sand box 101, and on the other side is a water tank 102. An outlet liquid pipeline 4 is provided at the upper part of the water tank 102, and the outlet liquid pipeline 4 is introduced into the inlet sleeve of the clarification barrel. An inlet liquid pipeline 3 is provided on one side of the sand box 101, and the inlet liquid pipeline 3 is communicated with the sand discharging pipeline of the reactor. A pneumatic valve is installed on the sand discharging pipeline. A mud and sand recovery pipeline 5 is provided on the other side of the sand box 101, and a pneumatic valve is installed on the mud and sand recovery pipeline 5. The mud and sand recovery pipeline 5 leads to a pump pit. A flushing water pipe 6 is provided at the bottom of the sand box 101, and the flushing water pipe 6 leads into the interior of the sand box 101. Water outlet holes are opened on the lower side of the flushing water pipe 6 to flush the interior of the sand box 101 regularly. The mud and sand in the sand box 101 are sent into a waste mud barrel by a slurry pump and then sent to a pressure filtration process to form filter cakes. A solenoid valve is provided on the flushing water pipe 6, and a level gauge is provided in the sand box 101. The level gauge is interlocked with the pneumatic valves of the sand discharging pipeline and the mud and sand recovery pipeline 5 and the solenoid valve. The ratio of the height of the partition overflow weir 2 to the height of the box body 1 is (0.5 - 0.8):1.

[0018] Due to the strong corrosiveness of the crude brine, all pipelines and pipe fittings of the filtering and recycling device are made of 316L material, which can effectively prevent pipeline and pipe fitting leakage caused by corrosion of the crude brine. Through actual measurement, the average sand discharging amount during a single sand discharging operation of the reactor is about 0.3 kg. According to the mud and sand density of 2 kg / m 3 in this production system, in order to ensure that the mud and sand can be easily flushed quickly, it is required that the stacking height of the mud and sand is lower than 0.2 m when evenly distributed on the side of the sand box 101. In order to minimize the amount of crude brine stored on the side of the sand box 101 at one time, the partition height is set at 0.3 m, with a surplus of 0.1 m as the safety height to prevent the mud and sand from flowing into the water tank 102 side. The lengths of the sand box 101 and the water tank 102 on both sides of the partition are 0.75 m respectively.

[0019] The working process of the utility model is as follows: For the sand discharging operation of the primary reactor, open the root valve of the sand discharging pipeline at the pointed bottom of the reactor and the pneumatic sand discharging valve. The mud and sand are self-pressurized into one side of the sand box 101 of the filtration and recovery device together with the primary brine. At this time, the solenoid valve of the flushing pipe 6 and the pneumatic valve of the mud and sand recovery pipeline 5 are all closed. As the liquid level on one side of the sand box 101 gradually rises, the mud and sand settle by gravity to the bottom of the sand box 101. The primary brine overflows to one side of the water tank 102 through the baffle overflow weir 2 and flows into the clarification barrel sleeve through the liquid outlet pipeline 4 for recovery. The level gauge values are respectively set with an interlocking control circuit for the pneumatic valve of the reactor sand discharging pipeline, the solenoid valve of the flushing pipe 6, and the pneumatic valve of the mud and sand recovery pipeline 5. When the level gauge value reaches the set high alarm value, the pneumatic valve of the reactor sand discharging pipeline is closed, and at the same time, the solenoid valve of the flushing pipe 6 and the pneumatic valve of the mud and sand recovery pipeline 5 are all opened. The mud and sand enter the pump pit through the mud and sand recovery pipeline 5 and are finally sent to the pressure filtration process to form filter cakes. The mud and sand level in the sand box 101 drops. When the mud and sand level drops to the set low alarm value, the solenoid valve of the flushing pipe 6 and the pneumatic valve of the mud and sand recovery pipeline 5 are all closed, and the valve position of the pneumatic valve of the reactor sand discharging pipeline is maintained, waiting for the next round of reactor sand discharging operation.

[0020] Finally, it should be noted that the above-listed are only the preferred embodiments of the utility model. Of course, those skilled in the art can make changes and modifications to the utility model. Provided that these modifications and variations fall within the scope of the claims of the utility model and its equivalent technologies, they should all be considered as the protection scope of the utility model.

Claims

1. A reactor sand discharge filtering and recovery device, comprising a box body (1), a baffle overflow weir (2) is arranged at the bottom of the box body (1), one side of the baffle overflow weir (2) is a sand box (101), and the other side of the baffle overflow weir (2) is a water tank (102), characterized in that: A liquid outlet pipeline (4) is arranged at the top of the water tank (102), a liquid inlet pipeline (3) is arranged at one side of the sand box (101), a mud and sand recovery pipeline (5) is arranged at the other side of the sand box (101), and a flushing pipe (6) is arranged at the bottom of the sand box (101). The flushing pipe (6) leads to the interior of the sand box (101), and a water outlet hole is opened at the lower side of the flushing pipe (6).

2. The reactor sand discharge filtering and recovery device according to claim 1, characterized in that: The liquid inlet pipeline (3) is connected to the sand discharge pipeline of the reactor. The sand discharge pipeline and the mud sand recovery pipeline (5) are both provided with pneumatic valves. The flushing pipe (6) is provided with a solenoid valve. A level meter is provided in the sand box (101). The level meter is interlocked with the pneumatic valve and the solenoid valve.

3. The reactor sand discharge filtering and recovery device according to claim 1, characterized in that: The ratio of the height of the baffle overflow weir (2) to the height of the box body (1) is 0.5-0.8:1.

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