Secondary absorption tower for ammonia-containing gas

Abstract

The utility model relates to the technical field of gas absorption, and provides a secondary absorption tower for ammonia-containing gas, which comprises a first absorption tower, a second absorption tower, a circulating water inlet, a gas phase inlet, a gas phase outlet, a storage tank and a partition plate, the partition plate is arranged in the middle of the interior of the storage tank, the first absorption tower and the second absorption tower are both communicated with the storage tank, the gas phase inlets are formed in the tops of the first absorption tower and the second absorption tower respectively, and the gas phase outlets are symmetrically formed in the bottom of the storage tank; the two independent absorption towers are integrated on one shared storage tank, so that the occupied area is greatly reduced, and the whole treatment system is more compact and is suitable for occasions with limited space; in the first absorption tower, normal-temperature circulating water is adopted for falling film absorption, so that the need of using frozen saline water is avoided, and the energy consumption is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas absorption technical field, specifically a kind of secondary absorption tower of ammonia-containing gas. BACKGROUND

[0002] In the field of chemical industry and environmental protection, it is an important task to treat ammonia-containing gas generated in the workshop. Traditionally, such gas is treated by absorption tower, and the common configuration is to set secondary absorption device, each device containing falling film absorption tower and independent ammonia water storage tank. Although this design can effectively absorb ammonia, it has problems of large floor area and high energy consumption. Specifically, each absorption tower needs to be equipped with an independent storage tank, resulting in an increase in overall floor area; at the same time, in order to ensure the absorption efficiency, especially in the second stage of absorption, frozen brine is often used for cooling, which not only increases the complexity of the equipment, but also significantly increases the energy consumption. In view of this, the present application is proposed. SUMMARY

[0003] The present application proposes a secondary absorption tower for ammonia-containing gas to solve the technical problems of large floor area and high energy consumption of the secondary absorption device in the prior art, which contains falling film absorption tower and independent ammonia water storage tank in each device. The above technical purpose of the utility model is realized by the following technical scheme:

[0004] A secondary absorption tower for ammonia-containing gas, comprising a first absorption tower, a second absorption tower, a circulating water inlet, a gas phase inlet, a gas phase outlet, a storage tank, and a partition, the first absorption tower and the second absorption tower are arranged at the top of the storage tank, the partition is arranged inside the storage tank, the first absorption tower and the second absorption tower are in communication with the storage tank, the gas phase inlet is arranged at the top of the first absorption tower and the second absorption tower respectively, the gas phase outlet is symmetrically arranged at the bottom of the storage tank, and the circulating water inlet is arranged on the upper side of the first absorption tower and the second absorption tower respectively.

[0005] Further, the storage tank is provided with frozen brine inside one side of the second absorption tower.

[0006] Further, the storage tank is provided with cooling water inside one side of the first absorption tower.

[0007] Further, the first absorption tower and the second absorption tower are each provided with a falling film.

[0008] Further, the storage tank is provided with a liquid level meter.

[0009] Further, the storage tank is provided with a drain at the bottom.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] By integrating two independent absorption towers into a shared storage tank, the floor space is greatly reduced, making the entire treatment system more compact, suitable for space-limited occasions; in the first absorption tower, normal temperature circulating water is used for falling film absorption, avoiding the need to use frozen brine, thereby significantly reducing energy consumption, and since the first absorption tower has removed most of the ammonia gas, the cooling intensity required by the second absorption tower is also correspondingly reduced, further saving energy; the first absorption tower uses normal temperature circulating water, which is highly efficient through falling film absorption, while the second absorption tower uses frozen brine which can be obtained by further cooling of the low-concentration ammonia water from the bottom of the first absorption tower for deep absorption, ensuring that the concentration of the final ammonia water reaches the saleable standard (about 24%), thereby improving resource utilization. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a structural schematic view of the utility model;

[0013] Fig. 2 It is a structural schematic view of the utility model from another perspective.

[0014] In the figure: 1, first absorption tower; 2, second absorption tower; 3, circulating water inlet; 4, gas phase inlet; 5, gas phase outlet; 6, storage tank; 7, partition; 8, liquid level meter; 9, drain. DETAILED DESCRIPTION

[0015] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The indicated device or element must have a specific orientation, a specific orientation, and operation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0016] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0017] To make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0018] Please refer to the accompanying Figs. 1-2 The secondary absorption tower containing ammonia gas comprises a first absorption tower 1, a second absorption tower 2, a circulating water inlet 3, a gas phase inlet 4, a gas phase outlet 5, a storage tank 6 and a partition 7, the first absorption tower 1 and the second absorption tower 2 are both arranged at the top of the storage tank 6, a falling film is arranged in the first absorption tower 1 and the second absorption tower 2, the partition 7 is arranged in the middle of the storage tank 6, the first absorption tower 1 and the second absorption tower 2 are communicated with the storage tank 6, the gas phase inlet 4 is arranged at the top of the first absorption tower 1 and the second absorption tower 2 respectively, the gas phase outlet 5 is symmetrically arranged at the bottom of the storage tank 6, and the circulating water inlet 3 is arranged on the upper side of the first absorption tower 1 and the second absorption tower 2 respectively.

[0019] The first absorption tower 1 and the second absorption tower 2 are both directly arranged at the top of the storage tank 6, forming two independent liquid storage spaces, but sharing one storage tank 6, thereby saving the space of the whole device, the gas phase inlet 4 is respectively located at the top of the first absorption tower 1 and the second absorption tower 2, and is used for introducing the ammonia-containing gas to be treated; the gas phase outlet 5 is symmetrically arranged at the bottom of the storage tank 6; in detail, the tail gas is led out from the bottom of the first absorption tower 1 to the second absorption tower 2 through a pipeline, and the circulating water inlet 3 is arranged on the upper side of the first absorption tower 1 and the second absorption tower 2, and is used for supplying the liquid required by the falling film absorption.

[0020] Working principle: the ammonia-containing gas first enters the first absorption tower 1 through the gas phase inlet 4, at the same time, the circulating water enters the first absorption tower 1 from the circulating water inlet 3, contacts with the gas in the form of a falling film, absorbs the ammonia gas therein, forms low-concentration ammonia water (about 15%), and is stored in one side of the storage tank 6 which is separated by the partition 7, the tail gas after preliminary absorption enters the second absorption tower 2 from the bottom of the first absorption tower 1 through a pipeline, in the second absorption tower 2, the remaining ammonia gas in the tail gas is further absorbed, forms high-concentration ammonia water (about 24%), and is stored in the other side of the storage tank 6. This design reduces the floor area, and the first absorption tower 1 reduces the energy consumption due to the use of normal-temperature circulating water.

[0021] In some embodiments, the storage tank 6 is internally provided with frozen brine on one side of the second absorption tower 2. When entering the second absorption tower 2, the lower temperature of the frozen brine in the storage tank 6 can more effectively absorb the remaining ammonia gas, so that the concentration of the final ammonia water is higher and reaches the saleable standard. The use of the frozen brine improves the absorption efficiency of the second absorption tower 2.

[0022] In some embodiments, the storage tank 6 is internally provided with cooling water on one side of the first absorption tower 1.

[0023] In some embodiments, the storage tank 6 is internally provided with a liquid level gauge 8 for monitoring the liquid level of the ammonia water to avoid overflow or deficiency.

[0024] In some embodiments, the storage tank 6 is internally provided with a liquid level gauge 8 for monitoring the liquid level of the ammonia water to avoid overflow or deficiency.

[0025] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included within the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A secondary absorption tower for ammonia-containing gas, characterized in that: The invention comprises a first absorption tower, a second absorption tower, a circulating water inlet, a gas phase inlet, a gas phase outlet, a storage tank and a partition. The first absorption tower and the second absorption tower are both arranged at the top of the storage tank, the partition is arranged in the middle of the storage tank, the first absorption tower and the second absorption tower are both connected to the storage tank, the gas phase inlet is respectively arranged at the top of the first absorption tower and the second absorption tower, the gas phase outlet is symmetrically arranged at the bottom of the storage tank, and the circulating water inlet is respectively arranged on the upper side of the first absorption tower and the second absorption tower.

2. A secondary absorption tower for ammonia-containing gas according to claim 1, characterized in that: The storage tank is located on one side of the second absorption tower and is provided with frozen brine.

3. The secondary absorption tower for ammonia-containing gas according to claim 1, characterized in that: The storage tank is located on one side of the first absorption tower and is internally provided with cooling water.

4. The secondary absorption tower for ammonia-containing gas according to claim 1, characterized in that: Falling films are provided in both the first absorption tower and the second absorption tower.

5. The secondary absorption tower for ammonia-containing gas according to claim 1, characterized in that: A liquid level gauge is provided in the storage tank.

6. The secondary absorption tower for ammonia-containing gas according to claim 1, characterized in that: A drain outlet is provided at the bottom of the storage tank.

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