Three-stage falling film absorption device for hydrochloric acid

Abstract

The utility model discloses a hydrochloric acid three-stage falling film absorption device, and belongs to the technical field of hydrochloric acid falling film absorption devices. The device mainly comprises a first-stage absorption tower, a second-stage absorption tower, a third-stage absorption tower and a fourth-stage absorption tower, the second-stage absorption tower is arranged on one side of the first-stage absorption tower, a second conveying pipe is connected between the second-stage absorption tower and the first-stage absorption tower through a pipeline, a third-stage absorption tower is arranged on one side of the second-stage absorption tower, and the third-stage absorption tower and the second-stage absorption tower are connected through a pipeline; and the filtering mechanism is arranged at the lower end of the second conveying pipe, the filtering mechanism is provided with a liquid outlet pipe connected to the second-stage absorption tower through a pipeline, and the lower end of the liquid outlet pipe is connected with a conduction barrel through a pipeline. And fixed impurities are prevented from entering the primary absorption tower and blocking the primary absorption tower.

Description

TECHNICAL FIELD

[0001] The application relates to a hydrochloric acid falling film absorption device technical field, in particular to a hydrochloric acid three-stage falling film absorption device. BACKGROUND

[0002] The hydrochloric acid falling film absorption tower is a commonly used gas absorption device, which is used for removing hydrochloric acid gas in industrial waste gas, and is designed according to the principle of solubility difference of substances. Through the mass transfer and heat transfer between liquid phase hydrochloric acid and gas phase hydrochloric acid, the purpose of separating and evolving gas is achieved.

[0003] The working principle of the hydrochloric acid falling film absorption tower is that waste gas containing hydrochloric acid gas is sprayed on the falling film layer in the tower through the nozzle, the gas is transferred from the gas-liquid interface to the liquid phase under the action of the liquid, after the action of mass transfer and heat transfer, the hydrochloric acid gas is absorbed into the liquid phase, so that the purification effect is achieved, at this time, the purified gas is discharged from the top outlet of the tower, and the waste liquid is periodically discharged from the bottom of the tower.

[0004] The hydrochloric acid three-stage falling film absorption device is divided into three absorption towers, and the step-by-step treatment of liquid phase hydrochloric acid is carried out through segmentation, so that the efficiency is higher and the absorption rate is better. The three-stage structure optimizes the gas-liquid contact and mass transfer effect.

[0005] However, the liquid phase hydrochloric acid usually contains some fixed impurities, which usually come from raw materials, production processes or storage conditions. During the step-by-step treatment of the liquid phase hydrochloric acid, the fixed impurities in the liquid phase hydrochloric acid will eventually enter the first-stage absorption tower, which will cause the first-stage absorption tower to be blocked after a long time, thereby shortening the service life of the absorption tower. Therefore, it is necessary to provide a hydrochloric acid three-stage falling film absorption device to solve the above problems.

[0006] It should be noted that the above information disclosed in the background section is only used to understand the background of the application concept, and therefore, it can contain information which does not constitute prior art. SUMMARY

[0007] Based on the above problems existing in the prior art, the application solves the problem of providing a hydrochloric acid three-stage falling film absorption device, which can prevent the fixed impurities in the liquid phase hydrochloric acid from entering the first-stage absorption tower.

[0008] The technical scheme adopted by the application to solve the technical problem is: a hydrochloric acid three-stage falling film absorption device, comprising:

[0009] A first-stage absorption tower, a gas inlet is connected to one side of the upper end of the first-stage absorption tower, and the gas inlet is used for conveying gas phase hydrochloric acid;

[0010] The secondary absorption tower is arranged on one side of the primary absorption tower, a second conveying pipe is connected between the secondary absorption tower and the primary absorption tower, one side of the secondary absorption tower is provided with a tertiary absorption tower, and the tertiary absorption tower is connected with the secondary absorption tower through a pipeline.

[0011] The filtering mechanism is arranged at the lower end of the second conveying pipe, the filtering mechanism has a liquid outlet pipe connected to the secondary absorption tower, the lower end of the liquid outlet pipe is connected with a conducting barrel, one side of the conducting barrel is connected with a liquid inlet pipe, and a filtering cavity is arranged in the conducting barrel.

[0012] The end of the conducting barrel away from the liquid outlet pipe is provided with an opening, a filtering barrel is arranged at the opening, one end of the filtering barrel is provided with a through hole, the filtering barrel is arranged in the filtering cavity, and filter holes are arranged in the filtering barrel.

[0013] Further, a retaining ring is fixedly arranged on the inner wall of the connecting end of the liquid outlet pipe and the conducting barrel, a threaded groove is arranged on the inner wall of the conducting barrel, and a threaded ring is arranged on the outer side of the end of the filtering barrel away from the filter hole.

[0014] Further, a fixed plate is fixedly arranged on the end of the filtering barrel close to the threaded ring, an installation hole is arranged on the fixed plate, a threaded hole is arranged on the end of the conducting barrel close to the opening, the threaded hole and the installation hole correspond to each other, a fixing bolt is screwed into the threaded hole and the installation hole, and a rubber pad is fixedly arranged on the inner wall of the fixed plate.

[0015] Further, a water supplement valve is arranged on one side of the upper end of the tertiary absorption tower, the water supplement valve is used for adding liquid-phase hydrochloric acid into the tertiary absorption tower, a first conveying pipe is connected to the other side of the upper end of the tertiary absorption tower, and the other end of the first conveying pipe is connected to the lower end of the secondary absorption tower.

[0016] Further, a waste valve is connected to one side of the bottom end of the primary absorption tower, and an exhaust port is arranged at the top end of the primary absorption tower.

[0017] Further, the lower end of the primary absorption tower, the secondary absorption tower and the tertiary absorption tower are fixedly provided with a base.

[0018] Further, the primary absorption tower is provided with a hydrochloric acid density automatic detector.

[0019] The beneficial effects of the present application are: the hydrochloric acid tertiary falling film absorption device provided by the present application is provided with a filtering mechanism, liquid phase hydrochloric acid flowing out of the liquid outlet pipe enters the filtering barrel, then the filtering barrel filters the fixed impurities, and the filtered liquid phase hydrochloric acid reenters the liquid inlet pipe, so that the liquid phase hydrochloric acid entering the second conveying pipe does not contain fixed impurities, preventing the fixed impurities from entering the primary absorption tower and causing blockage, thereby prolonging the service life of the absorption tower.

[0020] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification of the present application serve to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application.

[0022] In the drawings:

[0023] Figure 1 It is a whole schematic diagram of the hydrochloric acid tertiary falling film absorption device in the present application;

[0024] Figure 2 It is Figure 1 It is a separate enlarged schematic diagram of area A in the present application;

[0025] Figure 3 It is Figure 2 It is a sectional exploded schematic diagram of the filtering mechanism in the present application;

[0026] In the drawings, various reference signs:

[0027] 1, primary absorption tower; 11, base; 12, air inlet; 13, air outlet; 14, waste valve;

[0028] 2, filtering mechanism; 21, liquid outlet pipe; 22, liquid inlet pipe; 23, conducting barrel; 231, threaded groove; 232, threaded hole; 24, filtering cavity; 25, filtering barrel; 251, filter hole; 252, threaded ring; 253, fixed plate; 254, mounting hole; 27, retaining ring; 28, fixed bolt;

[0029] 3, secondary absorption tower; 31, second conveying pipe; 32, first conveying pipe; 4, tertiary absorption tower; 41, water supplement valve. DETAILED DESCRIPTION

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0032] As shown in Figure 1 The present application provides a hydrochloric acid tertiary falling film absorption device, which comprises a primary absorption tower 1, a secondary absorption tower 3 is arranged on one side of the primary absorption tower 1, the secondary absorption tower 3 is a liquid-phase hydrochloric acid storage tower of the primary absorption tower 1, the secondary absorption tower 3 is in a full tower state for a long time, that is, the secondary absorption tower 3 is filled with liquid-phase hydrochloric acid, a tertiary absorption tower 4 is arranged on the side of the secondary absorption tower 3 away from the primary absorption tower 1, the tertiary absorption tower 4 is used for adding supplemental liquid-phase hydrochloric acid into the secondary absorption tower 3, in the present application, the lower ends of the primary absorption tower 1, the secondary absorption tower 3 and the tertiary absorption tower 4 are fixedly installed with a base 11, and the three are communicated through pipelines;

[0033] Among them: the upper end of the tertiary absorption tower 4 is provided with a water supplement valve 41, liquid-phase hydrochloric acid is added into the tertiary absorption tower 4 through the water supplement valve 41, and the upper end of the tertiary absorption tower 4 is connected with a first conveying pipe 32 on the other side, the other end of the first conveying pipe 32 is connected to the lower end of the secondary absorption tower 3 through a pipeline, and the liquid-phase hydrochloric acid in the tertiary absorption tower 4 is transmitted into the secondary absorption tower 3 through the first conveying pipe 32;

[0034] At the same time, the bottom of the secondary absorption tower 3 is connected with a second conveying pipe 31 on the side away from the first conveying pipe 32, the other end of the second conveying pipe 31 is connected to the upper end of the primary absorption tower 1 through a pipeline, and a material transfer pump (not shown in the figure) is arranged on the second conveying pipe 31, the liquid-phase hydrochloric acid in the secondary absorption tower 3 is pumped into the primary absorption tower 1 through the material transfer pump.

[0035] And the upper end of the primary absorption tower 1 is connected with an air inlet 12 on the side away from the second conveying pipe 31 through a pipeline, the air inlet 12 is used for conveying gas-phase hydrochloric acid, the bottom end of the primary absorption tower 1 is connected with a waste valve 14 on the side through a pipeline, the waste valve 14 is used for regularly discharging waste liquid outward, and the top end of the primary absorption tower 1 is provided with an air outlet 13, the purified gas is discharged outward through the air outlet 13.

[0036] In the present application, a hydrochloric acid density automatic detector (not shown in the figure) is arranged in the primary absorption tower 1, the hydrochloric acid density automatic detector is a prior art, and is used for detecting the density of the hydrochloric acid arranged in the primary absorption tower 1.

[0037] Therefore, when the gas phase hydrochloric acid is treated, the primary absorption tower 1 is first filled with the liquid phase hydrochloric acid, then the gas phase hydrochloric acid to be treated is transported into the primary absorption tower 1 through the gas inlet 12, and the gas phase hydrochloric acid is sprayed on the falling film layer in the tower, the gas is transferred to the liquid phase from the gas-liquid interface under the action of the liquid, after the action of mass transfer and heat transfer, the hydrochloric acid gas is absorbed into the liquid phase, so as to achieve the purification effect, at this time, the purified gas is discharged from the gas outlet 13 at the top of the tower;

[0038] In this process, when the density in the primary absorption tower 1 reaches saturation through the automatic hydrochloric acid density detector, the waste valve 14 of the primary absorption tower 1 is started to discharge the waste liquid, when the liquid level of the primary absorption tower 1 drops to the lowest set value, the waste valve 14 of the primary absorption tower 1 is closed;

[0039] At this time, the material transfer pump from the secondary absorption tower 3 to the primary absorption tower 1 is opened, and the unsaturated liquid phase hydrochloric acid in the secondary absorption tower 3 is transferred into the primary absorption tower 1 for continuous absorption, when the liquid level of the primary absorption tower 1 reaches the highest set value, the material transfer is stopped.

[0040] Subsequently, the water supplement valve 41 is opened to start water supplement to the tertiary absorption tower 4, at this time, the liquid phase hydrochloric acid in the tertiary absorption tower 4 enters the secondary absorption tower 3 in an overflow manner, during the overflow process, the larger fixed impurities can be precipitated, when the liquid level of the secondary absorption tower 3 reaches the set value, the water supplement valve 41 is closed, so that the treatment of the gas phase hydrochloric acid is completed.

[0041] As shown in Figures 2-3 In order to filter the liquid phase hydrochloric acid entering the primary absorption tower 1, the lower end of the second conveying pipe 31 is provided with a filtering mechanism 2, the filtering mechanism 2 has a liquid outlet pipe 21 connected to the secondary absorption tower 3, the lower end of the liquid outlet pipe 21 is connected with a conducting barrel 23, one side of the conducting barrel 23 is connected with a liquid inlet pipe 22, in the present application, a filtering cavity 24 is arranged through the conducting barrel 23, and the liquid outlet pipe 21 and the liquid inlet pipe 22 are communicated through the filtering cavity 24;

[0042] The end of the conducting barrel 23 away from the liquid outlet pipe 21 is provided as an opening, a filtering barrel 25 is installed at the opening, one end of the filtering barrel 25 is provided as a through hole, so that the liquid phase hydrochloric acid and the fixed impurities can enter the filtering barrel 25, and the filtering barrel 25 is located in the filtering cavity 24, a plurality of filter holes 251 are formed in the filtering barrel 25, therefore, the liquid phase hydrochloric acid flowing out of the liquid outlet pipe 21 first enters the filtering barrel 25, and then enters the liquid inlet pipe 22 through the filter holes 251;

[0043] In order to install the filter barrel 25, the inner wall of the connecting end of the liquid outlet pipe 21 and the conducting barrel 23 is fixedly provided with a check ring 27, meanwhile, the inner wall of the conducting barrel 23 is provided with a threaded groove 231, the outer side of the end of the filter barrel 25 away from the filter hole 251 is provided with a threaded ring 252, the threaded ring 252 is engagedly connected with the threaded groove 231;

[0044] Meanwhile, the end of the filter barrel 25 close to the threaded ring 252 is fixedly provided with a fixed plate 253, the fixed plate 253 is provided with a plurality of groups of mounting holes 254 in the circumferential direction, and the end of the conducting barrel 23 close to the opening is provided with a threaded hole 232, the threaded hole 232 and the mounting hole 254 correspond to each other, and the threaded hole 232 and the mounting hole 254 are screw-connected with a fixing bolt 28.

[0045] In the present application, the inner wall of the fixed plate 253 is fixedly provided with a rubber pad, which improves the connection sealing between the fixed plate 253 and the conducting barrel 23.

[0046] In summary: when installing the filter barrel 25, first insert the filter barrel 25 into the filter cavity 24, then rotate the filter barrel 25 by hand, make the threaded ring 252 connected with the threaded groove 231, until the inner end of the filter barrel 25 is on the check ring 27, then align the mounting hole 254 with the threaded hole 232, and screw the fixing bolt 28 into the fixed position, it should be noted that because the mounting hole 254 is provided with a plurality of groups, the fixed plate 253 can be connected with the threaded hole 232 in multiple directions, thereby avoiding the misalignment of the mounting hole 254 and the threaded hole 232, of course, the mounting hole 254 can be set as a waist-shaped hole, so that it can be fine-tuned to adapt to the installation of the threaded hole 232;

[0047] At this time, the liquid phase hydrochloric acid flowing out of the liquid outlet pipe 21 will enter the filter barrel 25, then the fixed impurities will be filtered by the filter barrel 25, and the filtered liquid phase hydrochloric acid will enter the liquid inlet pipe 22, so that the liquid phase hydrochloric acid entering the second conveying pipe 31 will not contain fixed impurities, preventing the fixed impurities from entering the primary absorption tower 1 and causing blockage, thereby prolonging the service life of the absorption tower.

[0048] When the absorption tower is stopped, the fixing bolt 28 is disassembled at this time, and the filter barrel 25 is screwed out for regular cleaning.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A hydrochloric acid tertiary falling film absorption apparatus, characterized by: The utility model relates to a kind of gas phase hydrochloric acid absorption device, including: Primary absorption tower (1), the upper end side pipeline connection of primary absorption tower (1) is connected with gas inlet (12), the gas inlet (12) is used to transport gas phase hydrochloric acid; Secondary absorption tower (3), the secondary absorption tower (3) is arranged in the side of the primary absorption tower (1), and the second conveying pipe (31) is connected between the secondary absorption tower (3) and the primary absorption tower (1), one side of the secondary absorption tower (3) is provided with tertiary absorption tower (4), and the tertiary absorption tower (4) is connected by pipeline between the secondary absorption tower (3); Filtering mechanism (2), the filtering mechanism (2) is arranged in the lower end of the second conveying pipe (31), and the filtering mechanism (2) has liquid outlet pipe (21) connected by pipeline on the secondary absorption tower (3), the lower end of the liquid outlet pipe (21) is connected by pipeline with conducting barrel (23), one side of the conducting barrel (23) is connected by pipeline with liquid inlet pipe (22), and the conducting barrel (23) is provided with filter cavity (24) penetratingly in it, and the filter cavity (24) is used to communicate between the liquid outlet pipe (21) and the liquid inlet pipe (22); The end of the conducting barrel (23) away from the liquid outlet pipe (21) is provided as opening, and the opening is provided with filter barrel (25), one end of the filter barrel (25) is provided with through hole, the filter barrel (25) is located in the filter cavity (24), and the filter barrel (25) is provided with filter hole (251).

2. A hydrochloric acid tertiary falling film absorption apparatus according to claim 1, characterized in that: The inner wall of the connecting end of the liquid outlet pipe (21) and the conducting barrel (23) is fixedly provided with retaining ring (27), the inner wall of the conducting barrel (23) is provided with thread groove (231), and the outer side of the end of the filter barrel (25) away from the filter hole (251) is provided with thread ring (252), and the thread ring (252) is engagedly connected with the thread groove (231).

3. A hydrochloric acid tertiary falling film absorption apparatus according to claim 2, characterized in that: The end of the filter barrel (25) close to the thread ring (252) is fixedly provided with fixed plate (253), the fixed plate (253) is provided with mounting hole (254), the end of the conducting barrel (23) close to opening is provided with thread hole (232), the thread hole (232) and the mounting hole (254) correspond to each other, and the thread hole (232) and the mounting hole (254) are screw-connected with fixing bolt (28), and the inner wall of the fixed plate (253) is fixedly provided with rubber pad.

4. A hydrochloric acid tertiary falling film absorption apparatus according to claim 1, characterized in that: The upper end side of the tertiary absorption tower (4) is provided with water replenishing valve (41), the water replenishing valve (41) is used to add liquid phase hydrochloric acid into the tertiary absorption tower (4), and the upper end of the other side of the tertiary absorption tower (4) is connected by pipeline with first conveying pipe (32), and the other end of the first conveying pipe (32) is connected by pipeline with the lower end of the secondary absorption tower (3).

5. A hydrochloric acid tertiary falling film absorption apparatus according to claim 4, characterized in that: The bottom end side of the primary absorption tower (1) is connected by pipeline with waste valve (14), and the top end of the primary absorption tower (1) is provided with exhaust port (13).

6. A hydrochloric acid tertiary falling film absorption apparatus according to claim 1, characterized in that: The lower end of the primary absorption tower (1), the secondary absorption tower (3) and the tertiary absorption tower (4) is fixedly provided with base (11).

7. A hydrochloric acid tertiary falling film absorption apparatus according to claim 1, characterized in that: The primary absorption tower (1) is equipped with a hydrochloric acid density automatic detector.

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