CN211514001U - Improved chemical engineering tail gas absorption tower - Google Patents

Abstract

The utility model provides an improved chemical tail gas absorption tower, which mainly comprises a first-level absorption tower (1), a second-level absorption tower (2), and a third-level absorption tower (3). , 21, 31), absorbing fillers (12, 22, 32), sprinkler heads (13, 23, 33), pH detectors (14, 24, 34) and sewage outlet connection pumps (15, 25, 35) Composition; one end of the sewage outlet connecting pump (15, 25, 35) is connected to the sewage outlet at the lower end of the absorption tower liquid storage tank (11, 21, 31), and one end is connected with a pipeline (8) through a valve (7), and is connected with the corresponding storage tank. The tank inlet (9) is connected. The improved chemical exhaust gas absorption tower designed by the utility model realizes the utilization of waste water, saves water, and avoids environmental pollution caused by incomplete exhaust gas absorption by automatically monitoring the pH value and automatically starting the pump.

Description

An improved chemical tail gas absorption tower

technical field

The utility model belongs to the field of chemical industry, in particular to an improved chemical tail gas absorption tower.

Background technique

In the field of chemical production, a large amount of tail gas generated needs to be absorbed by absorption towers. For example, in the production of o-chlorophenylglycine, tap water, methanol, ammonia water, etc. are used as raw materials in the production process. At the same time, the methanol and ammonia water should be distilled and recovered during the production process, and the methanol gas, ammonia gas and other tail gas generated during the recovery process are absorbed by absorption. tower for absorption. At present, enterprises generally use tap water for three-stage absorption treatment. In the actual exhaust gas treatment process, the absorption liquid (especially the first-stage absorption liquid) needs to be replaced frequently, and the replacement method of the absorption liquid is to manually carry out the absorption liquid The pH value is measured, and after reaching a certain pH value, the absorbing liquid is discharged into the wastewater treatment station through the drain valve at the bottom of the water storage tank. If the above method is not well controlled, the absorption liquid will fail, which will cause waste gas to emerge and cause pollution.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned deficiencies in the prior art, the technical problem solved by this utility model is to provide an improved chemical tail gas absorption tower, which adopts the method of automatically monitoring the pH value of the absorption liquid, and pumps the absorption liquid into the receiving tank, for the next batch of production.

In order to achieve the above technical purpose, an improved chemical tail gas absorption tower described in this utility model mainly includes a first-level absorption tower, a second-level absorption tower, and a third-level absorption tower. , Sprinkler composition. The upper end of the liquid storage tank of the first-stage absorption tower is provided with a tail gas inlet, and the upper end of the first-stage absorption tower is connected with the upper end of the liquid storage tank of the second-stage absorption tower, and the upper end of the second-stage absorption tower and the upper end of the liquid storage tank of the third-stage absorption tower are connected by ventilation pipes, and An induced draft fan is installed between the upper end of the secondary absorption tower and the ventilation pipe at the upper end of the liquid storage tank of the tertiary absorption tower, and the upper end of the tertiary absorption tower is provided with an air outlet. A sewage outlet is provided at the lower end of the liquid storage tank of each absorption tower. In order to automatically monitor the pH value of each liquid storage tank, an automatic pH value detector is installed in the liquid storage tank.

Further, a sewage outlet connection pump is installed at the sewage outlet at the lower end of each absorption tower liquid storage tank. Among them, the sewage outlet connection pump of the three-stage absorption tower is connected to the liquid storage tank access port of the two-stage absorption tower and the liquid storage tank access port of the first-stage absorption tower through two parallel valves through two pipelines respectively. The port connecting pump passes through a valve and is connected to the inlet of the liquid storage tank of the first-stage absorption tower through a pipeline, and the sewage outlet connecting pump of the first-stage absorption tower passes through a valve and is connected to the receiving tank through a pipeline.

Further, the position of the inlet where the sewage outlet connecting pump is connected to the liquid storage tank of the secondary absorption tower and the liquid storage tank of the primary absorption tower should be more than 20 cm higher than the absorption liquid.

In the above technical scheme, the designed improved chemical exhaust gas absorption tower realizes the utilization of waste water, reduces the discharge of waste water, saves water consumption, and avoids the environment caused by incomplete absorption of exhaust gas by automatically monitoring the pH value and automatically starting the pump Pollution.

Description of drawings

Fig. 1 is the connection diagram of the improved chemical tail gas absorption tower of the utility model.

Figure 1: 1. Primary absorption tower, 11. Liquid storage tank of primary absorption tower, 12. Absorption packing of primary absorption tower, 13. Sprinkler head of primary absorption tower, 14. PH value detector of primary absorption tower, 15. The sewage outlet of the primary absorption tower is connected to the pump, 2. The secondary absorption tower, 21, The liquid storage tank of the secondary absorption tower, 22, The absorption packing of the secondary absorption tower, 23, The sprinkler head of the secondary absorption tower, 24, The secondary absorption tower PH value detector of the first-stage absorption tower, 25. The sewage outlet of the second-stage absorption tower is connected to the pump, 3. The third-stage absorption tower, 31. The liquid storage tank of the third-stage absorption tower, 32, The absorption packing of the third-stage absorption tower, 33. The third-stage absorption tower Tower sprinkler head, 34, PH value detector of three-stage absorption tower, 35, pump connected to sewage outlet of three-stage absorption tower, 4, exhaust gas inlet, 5, induced draft fan, 6, exhaust port, 7, valve, 8 , pipeline, 9, the access port of the liquid storage tank.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to FIG. 1 . Obviously, the described embodiments are only some specific embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The utility model is an improved chemical tail gas absorption tower, comprising a first-level absorption tower 1, a second-level absorption tower 2, and a third-level absorption tower 3, and each absorption tower respectively comprises a liquid storage tank (11, 21, 31), an absorption filler (12, 22, 32), sprinkler head (13, 23, 33), PH value detector (14, 24, 34), sewage outlet connection pump (15, 25, 35).

The device is connected to the tail gas at the position of the tail gas inlet 4 of the first-stage absorption tower. Under the action of the induced draft fan 5, the tail gas is led to the third-stage absorption tower. emission. There is a spray head (13, 23, 33) at the top of the absorption tower at all levels, and the absorption liquid of the liquid storage tank (11, 21, 31) is sprayed from the spray head (13, 23, 33) by a pump. The absorbing liquid is recovered to the liquid storage tank (11, 21, 31) through the absorbing filler (12, 22, 32). When the absorption tower runs for a period of time, the absorption liquid in the liquid storage tanks (11, 21, 31) needs to be replaced, especially the first-stage absorption tower, the replacement frequency is higher. The device is equipped with on-line pH value detectors (14, 24, 34) on the first, second and third-stage absorption towers, and a sewage outlet connection pump (15, 25, 35) is installed on the original sewage outlet position. 1. After the absorption liquid of the secondary absorption tower 2 reaches the predetermined index of the PH value detector, the interlock device opens the corresponding valve 7, and the absorption liquid is transported to the workshop receiving tank through the newly added pipeline 8, and the absorption of the third-stage absorption tower 3 The liquid is pumped into the first-level absorption tower 1, and the absorption liquid of each level of absorption tower is automatically replenished to the predetermined scale. One end of the new pipeline 8 is connected to the pump (25, 35) through the original sewage outlet, and the other end is connected to the inlet 9 of the liquid storage tank of the absorption tower.

Claims (3)

1. An improved chemical tail gas absorption tower, which mainly includes a first-stage absorption tower (1), a second-stage absorption tower (2), and a third-stage absorption tower (3). , 31), absorption packing (12, 22, 32), sprinkler heads (13, 23, 33), the upper end of the liquid storage tank of the first-stage absorption tower (11) is provided with a tail gas inlet (4), the first-stage absorption The upper end of the tower (1) is connected with the upper end of the liquid storage tank (21) of the secondary absorption tower, the upper end of the secondary absorption tower (2) and the upper end of the liquid storage tank (31) of the third stage absorption tower are connected by ventilation pipes, and are connected to the upper end of the liquid storage tank of the secondary absorption tower (31). 2) An induced draft fan (5) is installed between the upper end and the ventilation pipe at the upper end of the liquid storage tank (31) of the three-stage absorption tower, and an exhaust port (6) is provided at the upper end of the three-stage absorption tower (3). The lower end of the tank (11, 21, 31) is provided with a sewage outlet, which is characterized in that: each absorption tower liquid storage tank (11, 21, 31) is equipped with an automatic pH value detector (14, 24, 34). 2. The improved chemical tail gas absorption tower according to claim 1 is characterized in that: a sewage outlet connection pump (15, 25, 35), one end of the sewage outlet connecting pump (15, 25, 35) is connected to the sewage outlet at the lower end of the liquid storage tank (11, 21, 31) of the absorption tower, and one end is connected to the pipeline (8) through the valve (7); The sewage outlet of the absorption tower (3) is connected to the pump (35) through two parallel valves (7) through two pipelines (8) to the liquid storage tank inlet (9) of the secondary absorption tower and the storage tank of the primary absorption tower. The liquid tank access port (9), the sewage discharge port of the secondary absorption tower is connected to the pump (25) through a valve (7) and then connected to the liquid storage tank access port (9) of the primary absorption tower through a pipeline (8). The sewage outlet of the tower is connected to the pump (15) through a valve (7) and then connected to the receiving tank through a pipeline (8). 3. The improved chemical tail gas absorption tower according to claim 2, characterized in that: the sewage outlet connection pump (25, 35) is connected to the secondary absorption tower liquid storage tank (21) and the primary absorption tower storage tank (21) The position of the inlet (9) of the liquid tank (11) should be more than 20cm above the absorption liquid.

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