Efficient formaldehyde absorption device

Abstract

The utility model discloses an efficient formaldehyde absorption device, which belongs to the technical field of fine chemical equipment and comprises a first formaldehyde absorption tower, a formaldehyde finished product tank and a second formaldehyde absorption tower, and a gas outlet arranged at the top of the first formaldehyde absorption tower is connected with a formaldehyde gas inlet arranged at the lower end of the second formaldehyde absorption tower through a pipeline. A formaldehyde solution extraction opening formed in the bottom of the second formaldehyde absorption tower is connected with a first-section absorption liquid distributor arranged at the upper end of the first formaldehyde absorption tower through a pipeline. The utility model can solve the problem that the absorption efficiency of the formaldehyde solution is influenced due to poor mixing effect of formaldehyde steam and the solution caused by over-high descending speed of the solution in the prior art. The two-stage absorption tower is adopted, the upper liquid distributor and the lower liquid distributor are mounted in each absorption tower, formaldehyde steam enters through the formaldehyde gas inlet in the bottom of the absorption tower and then can be fully absorbed through the upper packing layer, the lower packing layer, the upper liquid distributor and the lower liquid distributor, and the formaldehyde absorption rate and the formaldehyde absorption effect are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fine chemical equipment, in particular to an efficient formaldehyde absorption device. Background Technique

[0002] Formaldehyde has a wide range of uses in industries such as petrochemical, medicine, light textile, biochemistry, energy, and transportation. It can be used as a disinfectant and preservative, and can also be used to prepare various products such as phenolic resin, urea-formaldehyde resin, melamine resin, hexamine, and pentaerythritol.

[0003] At present, the preparation of formaldehyde solution is carried out through a formaldehyde absorption tower. However, during the formaldehyde absorption process, the formaldehyde gas flows from bottom to top, and the absorption liquid flows from top to bottom. The too fast descending speed of the solution leads to a poor mixing effect between the formaldehyde vapor and the solution, affecting the absorption efficiency of the formaldehyde solution. Content of the Utility Model

[0004] The purpose of the utility model is to provide an efficient formaldehyde absorption device, which can effectively improve the formaldehyde absorption rate and the formaldehyde absorption effect, and can solve the problems in the prior art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An efficient formaldehyde absorption device includes a first formaldehyde absorption tower, a formaldehyde finished product tank, and a second formaldehyde absorption tower. The gas outlet provided at the top of the first formaldehyde absorption tower is connected to the formaldehyde gas inlet provided at the lower end of the second formaldehyde absorption tower through a pipeline. The formaldehyde solution extraction outlet provided at the bottom of the second formaldehyde absorption tower is connected to the first-stage absorption liquid distributor provided at the upper end of the first formaldehyde absorption tower through a pipeline. The formaldehyde solution extraction outlet provided at the bottom of the first formaldehyde absorption tower is connected to the formaldehyde finished product tank through a pipeline.

[0007] Preferably, defoaming sections are provided at the upper ends of both the first formaldehyde absorption tower and the second formaldehyde absorption tower.

[0008] Preferably, first-stage absorption liquid distributors are provided at the upper ends of both the first formaldehyde absorption tower and the second formaldehyde absorption tower. A first packing layer is provided below the first-stage absorption liquid distributor. A liquid collector is provided below the first packing layer. The liquid collector is connected to the first-stage absorption liquid distributor through a first circulation pump.

[0009] Preferably, second-stage absorption liquid distributors are provided at the lower ends of both the first formaldehyde absorption tower and the second formaldehyde absorption tower. A second packing layer is provided below the second-stage absorption liquid distributor. A liquid storage tank is provided below the second packing layer. The liquid storage tank is connected to the second-stage absorption liquid distributor through a second circulation pump.

[0010] Preferably, formaldehyde gas inlets are provided at the lower ends of both the first formaldehyde absorption tower and the second formaldehyde absorption tower.

[0011] Preferably, first observation ports are provided at the upper ends of both the first formaldehyde absorption tower and the second formaldehyde absorption tower, and second observation ports are provided at the lower ends of both the first formaldehyde absorption tower and the second formaldehyde absorption tower.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model adopts two-stage absorption towers. Two liquid distributors are installed in each absorption tower. After formaldehyde vapor enters through the formaldehyde gas inlets at the bottom of the absorption tower, it can be fully absorbed after passing through the upper and lower packing layers and the upper and lower liquid distributors. Among them, the liquid collector below the first packing layer in the upper section transports the formaldehyde solution to the first-stage absorption liquid distributor in the upper section for multiple-cycle absorption. A second circulation pump is installed in the liquid storage tank in the lower section to transport the unqualified formaldehyde solution to the second-stage absorption liquid distributor in the lower section for multiple-cycle absorption, enabling the formaldehyde solution and formaldehyde vapor to come into contact and be absorbed multiple times, improving the absorption rate of formaldehyde vapor. The gas that is not fully absorbed at the gas outlet of the first formaldehyde absorption tower is transported to the formaldehyde gas inlet provided at the lower end of the second formaldehyde absorption tower, and the low-concentration formaldehyde solution that does not meet the standard in the liquid storage tank at the bottom of the second formaldehyde absorption tower is transported to the first-stage absorption liquid distributor provided at the upper end of the first formaldehyde absorption tower, effectively improving the formaldehyde absorption rate and the formaldehyde absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural diagram of the high-efficiency formaldehyde absorption device of the present utility model;

[0015] Figure 2 is a structural diagram of the first formaldehyde absorption tower of the present utility model.

[0016] In the figure: 1, the first formaldehyde absorption tower; 11, the defoaming section; 12, the first-stage absorption liquid distributor; 13, the first packing layer; 14, the liquid collector; 15, the first circulation pump; 16, the second-stage absorption liquid distributor; 17, the second packing layer; 18, the liquid storage tank; 19, the formaldehyde solution sampling outlet; 110, the second circulation pump; 111, the formaldehyde gas inlet; 112, the first observation port; 113, the second observation port; 114, the gas outlet; 2, the formaldehyde product tank; 3, the second formaldehyde absorption tower. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] In order to solve the technical problem that in the existing formaldehyde absorption process, the formaldehyde gas goes from bottom to top and the absorption liquid goes from top to bottom, resulting in a too fast solution descent speed, a poor mixing effect between the formaldehyde vapor and the solution, and affecting the absorption efficiency of the formaldehyde solution, please refer to Figure 1 - Figure 2 , the following technical solutions are provided in this embodiment:

[0019] An efficient formaldehyde absorption device includes a first formaldehyde absorption tower 1, a formaldehyde finished product tank 2, and a second formaldehyde absorption tower 3. The gas outlet 114 provided at the top of the first formaldehyde absorption tower 1 is connected to the formaldehyde gas inlet 111 provided at the lower end of the second formaldehyde absorption tower 3 through a pipeline. The formaldehyde solution extraction port 19 provided at the bottom of the second formaldehyde absorption tower 3 is connected to the first-stage absorption liquid distributor 12 provided at the upper end of the first formaldehyde absorption tower 1 through a pipeline. The formaldehyde solution extraction port 19 provided at the bottom of the first formaldehyde absorption tower 1 is connected to the formaldehyde finished product tank 2 through a pipeline.

[0020] It should be noted that by using two-stage absorption towers and arranging multi-stage absorption mixing devices and internal circulation devices in each absorption tower, not only the problems of a too fast solution descent speed resulting in a poor mixing effect between the formaldehyde vapor and the solution and low absorption efficiency of the formaldehyde solution are solved, but also the formaldehyde solution concentration of each stage is effectively controlled.

[0021] In this embodiment, defoaming sections 11 are provided at the upper ends of both the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3.

[0022] In this embodiment, first-stage absorption liquid distributors 12 are provided at the upper ends of both the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3. A first packing layer 13 is provided below the first-stage absorption liquid distributor 12. A liquid collector 14 is provided below the first packing layer 13. The liquid collector 14 is connected to the first-stage absorption liquid distributor 12 through a first circulation pump 15.

[0023] In this embodiment, second-stage absorption liquid distributors 16 are provided at the lower ends of both the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3. A second packing layer 17 is provided below the second-stage absorption liquid distributor 16. A liquid storage tank 18 is provided below the second packing layer 17. The liquid storage tank 18 is connected to the second-stage absorption liquid distributor 16 through a second circulation pump 110.

[0024] It should be noted that discharge ports are provided on the right sides of the packing fixing partitions of the first packing layer 13 and the second packing layer 17, and a number of through holes are formed in the packing fixing partitions. Among them, the packing is Pall rings made of metal materials.

[0025] In this embodiment, formaldehyde gas inlets 111 are provided at the lower ends of both the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3.

[0026] It should be noted that the formaldehyde gas inlets 111 formed at the bottoms of the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3 are above the liquid level of the liquid storage tank 18.

[0027] In this embodiment, first observation ports 112 are provided at the upper ends of both the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3, and second observation ports 113 are provided at the lower ends of both the first formaldehyde absorption tower 1 and the second formaldehyde absorption tower 3.

[0028] Working principle: The low-concentration formaldehyde solution extracted from the formaldehyde solution extraction outlet 19 provided at the liquid storage tank 18 of the second formaldehyde absorption tower 3 is connected to the first-stage absorption liquid distributor 12 provided at the upper end of the first formaldehyde absorption tower 1 through an output pump, and is mixed with the formaldehyde vapor from the first formaldehyde absorption tower 1 in the second formaldehyde absorption tower 3; among them, the formaldehyde solution in the first-stage absorption zone falls on the liquid collector 14 and circulates in the first-stage absorption zone through the first circulation pump 15 to improve the absorption efficiency. When the formaldehyde solution is absorbed to a certain concentration, it overflows into the second-stage absorption zone, where it is mixed with the formaldehyde solution in the second packing layer 17 and absorbed into the liquid storage tank 18. The unqualified formaldehyde solution is connected to the second-stage absorption liquid distributor 16 through the second circulation pump 110 and circulates continuously in the second-stage absorption zone. After reaching the standard, it enters the formaldehyde finished product tank 2 through the output pump. The gas containing a small amount of formaldehyde passes through the defoaming section 11 and is connected to the second formaldehyde absorption tower 3 through the gas outlet 114, and enters the interior of the second formaldehyde absorption tower 3 through the formaldehyde gas inlet 111 for further circulation absorption, which can fully mix and absorb to improve the formaldehyde absorption efficiency.

[0029] Therefore, by adopting two-stage absorption towers, with two liquid distributors installed up and down in each absorption tower, the formaldehyde vapor can be fully absorbed after entering through the formaldehyde gas inlet 111 at the bottom of the absorption tower and passing through the upper and lower packing layers and the upper and lower liquid distributors.

[0030] Among them, the liquid collector 14 below the first packing layer 13 in the upper section conveys the formaldehyde solution to the first-stage absorption liquid distributor 12 in the upper section for multiple cycles of absorption. The liquid storage tank 18 in the lower section is equipped with a second circulation pump 110, which conveys the unqualified formaldehyde solution to the second-stage absorption liquid distributor 16 in the lower section for multiple cycles of absorption, enabling the formaldehyde solution and the formaldehyde vapor to come into contact and be absorbed multiple times, thereby improving the absorption rate of the formaldehyde vapor.

[0031] Among them, the gas that is not completely absorbed at the gas outlet 114 of the first formaldehyde absorption tower 1 is transported to the formaldehyde gas inlet 111 provided at the lower end of the second formaldehyde absorption tower 3, and the low-concentration formaldehyde solution that does not meet the standard in the bottom liquid storage tank 18 of the second formaldehyde absorption tower 3 is transported to the first-stage absorption liquid distributor 12 provided at the upper end of the first formaldehyde absorption tower 1, effectively improving the formaldehyde absorption rate and the formaldehyde absorption effect.

[0032] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient formaldehyde absorption device, comprising a first formaldehyde absorption tower (1), a formaldehyde finished product tank (2) and a second formaldehyde absorption tower (3), characterized in that: The gas outlet (114) arranged at the top of the first formaldehyde absorption tower (1) is connected to the formaldehyde gas inlet (111) arranged at the lower end of the second formaldehyde absorption tower (3) through a pipeline, the formaldehyde solution extraction outlet (19) arranged at the bottom of the second formaldehyde absorption tower (3) is connected to the first absorption liquid distributor (12) arranged at the upper end of the first formaldehyde absorption tower (1) through a pipeline, and the formaldehyde solution extraction outlet (19) arranged at the bottom of the first formaldehyde absorption tower (1) is connected to the formaldehyde finished product tank (2) through a pipeline.

2. The efficient formaldehyde absorption device according to claim 1, characterized in that: The upper ends of the first formaldehyde absorption tower (1) and the second formaldehyde absorption tower (3) are both provided with a defoaming section (11).

3. The efficient formaldehyde absorption device according to claim 2, characterized in that: A first-stage absorption liquid distributor (12) is disposed at the upper end of each of the first formaldehyde absorption tower (1) and the second formaldehyde absorption tower (3); a first packing layer (13) is disposed below the first-stage absorption liquid distributor (12); a liquid collector (14) is disposed below the first packing layer (13); and the liquid collector (14) is connected to the first-stage absorption liquid distributor (12) via a first circulation pump (15).

4. The efficient formaldehyde absorption device according to claim 3, characterized in that: A second absorption liquid distributor (16) is disposed at the lower end of each of the first formaldehyde absorption tower (1) and the second formaldehyde absorption tower (3); a second packing layer (17) is disposed below the second absorption liquid distributor (16); a liquid storage tank (18) is disposed below the second packing layer (17); and the liquid storage tank (18) is connected to the second absorption liquid distributor (16) via a second circulation pump (110).

5. The efficient formaldehyde absorption device according to claim 4, characterized in that: The lower ends of the first formaldehyde absorption tower (1) and the second formaldehyde absorption tower (3) are both provided with a formaldehyde gas inlet (111).

6. The efficient formaldehyde absorption device according to claim 5, characterized in that: The upper ends of the first formaldehyde absorption tower (1) and the second formaldehyde absorption tower (3) are both provided with a first observation port (112), and the lower ends of the first formaldehyde absorption tower (1) and the second formaldehyde absorption tower (3) are both provided with a second observation port (113).

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