Flow equalizing jet device used in absorption tower

Abstract

The utility model discloses a flow-equalizing jet device used in an absorption tower, and belongs to the technical field of flue gas pollutant treatment. The device comprises an absorption tower; an absorbent circulating tank, a flow equalizing ejector and a demister are arranged in the absorption tower from bottom to top; the absorbent circulating tank is filled with an absorbent, one side of the absorbent circulating tank is communicated with the interior of the flow equalizing ejector, and the other side of the absorbent circulating tank is communicated with the upper part of the flow equalizing ejector to form an absorbent circulating flow loop; and a flue gas flowing space is formed between the absorbent circulating groove and the flow equalizing ejector and is communicated with an external flue gas pipeline. Based on the design of the flow equalizing ejector, the demister, the absorbent circulating groove, the absorbent circulating flow loop and other structures, the device effectively improves the flow equalizing effect of a flue gas flow field; the spraying is uniform, and the mixing and absorbing effects of the absorbent and the flue gas are improved; the structure is compact and the strength is high; installation is convenient, and overhaul and maintenance are simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas pollutant treatment, and particularly relates to a uniform flow injection device used in an absorption tower. Background Art

[0002] Absorption is a common flue gas treatment process in the power, steel, and chemical industries, and its core equipment is the absorption tower. Conventional absorption towers include absorbent spray devices and flue gas equalization devices. To achieve higher process performance, the number of spray layers and equalization layers within the absorption tower is often increased, which not only increases the height of the absorption tower but also increases equipment investment. Utility Model Content

[0003] In response to the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a uniform flow injection device for use in an absorption tower. By integrating the uniform flow and injection functions into one device, the process performance of the absorption tower can be greatly improved on the basis of simplifying the internal components of the absorption tower.

[0004] The utility model provides the following technical solution: a uniform flow injection device for use in an absorption tower, comprising an absorption tower; an absorbent circulation groove, a uniform flow injector and a demister are arranged inside the absorption tower from bottom to top; the absorbent circulation groove is filled with absorbent, one side of which is connected to the interior of the uniform flow injector, and the other side is connected to the upper part of the uniform flow injector to form an absorbent circulation flow loop; a flue gas flow space is formed between the absorbent circulation groove and the uniform flow injector, which is connected to an external flue gas duct.

[0005] Furthermore, a support base is provided inside the absorption tower, and the flow-uniform injector is arranged on the support base.

[0006] Furthermore, the uniform flow ejector includes a main body, a sealed cavity is provided inside the main body, the cavity is connected to the absorbent circulation tank so as to be filled with absorbent, and a group of uniform flow ejection chambers are provided in the cavity, and the group of uniform flow ejection chambers are vertically arranged and spaced apart.

[0007] Furthermore, the uniform flow injection chamber includes an inlet contraction chamber, an injection chamber and an outlet diffusion chamber which are sequentially arranged from bottom to top; a group of penetrating injection ports are opened on the chamber wall of the injection chamber.

[0008] Furthermore, the heights of the injection ports on a group of uniform flow injection chambers are all the same.

[0009] Furthermore, a plurality of layers of flow-uniform support plates are provided in the main body for supporting a group of flow-uniform injection chambers. A group of guide holes are provided on the flow-uniform support plates for guiding the absorbent inside the main body into the injection chamber from the injection port.

[0010] Furthermore, the guide hole is arranged between two adjacent equal flow injection chambers.

[0011] Furthermore, the structural dimensions of the inlet contraction cavity gradually shrink along the direction of smoke flow; and the structural dimensions of the outlet diffusion cavity gradually expand along the direction of smoke flow.

[0012] Furthermore, a group of air guide covers communicating with the outlet diffusion chamber are provided on the upper part of the main body.

[0013] Furthermore, one side of the absorbent circulation tank is connected to the interior of the equalizing flow ejector through a circulation liquid inlet pipe, and the circulation liquid inlet pipe is connected to a circulation pump; the other side of the absorbent circulation tank is connected to the upper part of the equalizing flow ejector through a circulation return pipe, and the bottom of the circulation return pipe orifice is flush with the upper end surface of the upper wall plate of the equalizing flow ejector.

[0014] By adopting the above technology, compared with the existing technology, the beneficial effects of the present invention are as follows:

[0015] 1) Good flue gas flow field uniformity: In the device of the utility model, based on the structural design of multiple uniform flow injection chambers on the uniform flow injector, the arrangement of the uniform flow injection chambers can be adjusted according to the flow field simulation conditions to achieve good flow field uniformity after the flue gas passes through the uniform flow injector;

[0016] 2) Uniform injection, good mixing and absorption effect of absorbent and flue gas: In the device of the utility model, the injection port of the uniform flow injection chamber is immersed in the absorbent, and the horizontal height of all injection ports in the uniform flow injector is the same. According to Pascal's principle, the static pressure of the absorbent at each injection port is the same; and the flow rate of the absorbent in the uniform flow injector is very low, and its dynamic pressure can be ignored. Therefore, the absorbent pressure on each injection port is the same, and thus the absorbent flow rate and flow rate of each injection port are also the same; the uniformity of the absorbent injection in each uniform flow injector is ensured, so that the absorbent and the flue gas passing through can have a better mixing effect, thereby improving the absorption effect;

[0017] 3) Compact structure and high strength: In the device of the utility model, the wall thickness of the flow-equalizing injection cavity and the flow-equalizing support plate in the flow-equalizing injector can be reasonably selected according to the absorbent load and the flue gas flow conditions, so as to play the role of the internal structural support of the flow-equalizing injector. There is no need to set up additional reinforcing support components, so that the flow-equalizing injector has a high structural strength.

[0018] 4) Easy installation and simple overhaul and maintenance: In the device of the present invention, the support base can be fixed in the absorption tower by welding or bolt connection. The uniform flow ejector can be prefabricated in the factory and installed in the absorption tower as a whole. It does not need to be processed and manufactured on site. It is easy to install and has high precision. When overhaul is required, the uniform flow ejector can be disassembled as a whole to the outside of the absorption tower, which is convenient and efficient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal top view of the flow-balancing ejector of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal main structure of the flow-balancing ejector of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Rather, the present invention encompasses any alternatives, modifications, equivalents, and solutions within the spirit and scope of the present invention as defined by the claims. Furthermore, to facilitate a better understanding of the present invention, certain specific details are detailed below in the detailed description of the present invention. Those skilled in the art will be able to fully understand the present invention without these details.

[0024] See also Figure 1-3 A uniform flow injection device for use in an absorption tower includes an absorption tower 1, wherein the interior of the absorption tower 1 is provided with an absorbent circulation tank 2, a uniform flow injector 3 and a demister 4; the absorbent circulation tank 2; the absorbent circulation tank 2 is filled with absorbent, which is connected to the interior of the uniform flow injector 3 and the upper part of the uniform flow injector 3 through pipelines, and the combination forms an absorbent circulation flow loop.

[0025] Specifically, the flow-distributing ejector 3 includes a main body 301, which is composed of an upper wall plate, a side wall plate and a lower wall plate to form a closed cavity structure; a support base 5 is fixedly installed on the tower wall of the absorption tower 1, and the flow-distributing ejector 3 is fixed to the support base 5 by bolts.

[0026] The support base 5 not only supports the flow-uniform ejector 3, but also seals the gap between the flow-uniform ejector 3 and the wall of the absorption tower 1 to prevent flue gas short-circuiting and leakage of the upper absorption liquid.

[0027] Specifically, multiple flow-balancing injection chambers 6 are vertically arranged inside the flow-balancing injector 3, and the flue gas passes from bottom to top through the flow-balancing injection chambers 6. The multiple flow-balancing injection chambers 6 can be evenly arranged inside the flow-balancing injector 3, or non-uniformly arranged according to the flow field simulation calculation.

[0028] The uniform flow injection chamber 6 includes an inlet contraction chamber 601 , an injection chamber 602 and an outlet diffusion chamber 603 , which are arranged in sequence from bottom to top.

[0029] The inlet contraction chamber 601 is conical, converging in the direction of the flue gas, with a cone angle of 40°-60°. The injection chamber 602 is cylindrical, with an inner diameter of approximately 10mm-30mm and a length of approximately 150mm-300mm. Two to four injection ports 604 are formed on the wall of the injection chamber 602, each with an inner diameter of approximately 3mm-10mm. All injection ports 604 are positioned at the same height within the flow-balancing injector 3, and the injection chamber's cone angle is approximately 10°-20°. By adjusting the diameters of the inlet and outlet of the flow-balancing injector chamber 6, a uniform flow field is achieved after the flue gas passes through the flow-balancing injector.

[0030] The outlet diffusion cavity 603 is conical and expands along the direction of the smoke. The upper wall of the main body 301 is provided with a set of air guide covers 8 connected to the outlet diffusion cavity 603. The top of the air guide covers 8 is 300mm-600mm higher than the upper wall.

[0031] Specifically, multiple layers of flow balancing support plates 7 are arranged inside the flow balancing injector 3. The flow balancing support plates 7 are connected to the sidewall plates and the flow balancing injector cavity 6. Multiple flow guide holes 701 are evenly opened on the flow balancing support plates 7, allowing the absorbent to evenly enter each flow balancing injector cavity 6 through the flow guide holes 701.

[0032] Specifically, the space between the uniform flow injection cavity 6 and the upper wall plate and the side wall plate of the uniform flow injector 3 is filled with an absorbent, and the absorbent has a certain pressure.

[0033] Specifically, the demister 4 is located in the upper space of the flow-balancing ejector 3, and the absorbent circulation tank 2 is located below the flow-balancing ejector 3. A flue gas flow space is formed between the absorbent circulation tank 2 and the flow-balancing ejector 3, which is connected to the external flue gas duct through a flue gas inlet nozzle provided on the wall of the absorption tower 1.

[0034] One side of the absorbent circulation tank 2 is connected to the interior of the flow-distributing ejector 3 via a circulation inlet pipe 9, which is connected to a circulation pump 10 for power. The other side of the absorbent circulation tank 2 is connected to the top of the flow-distributing ejector 3 via a circulation return pipe 11. The bottom of the pipe opening of the circulation return pipe 11 is flush with the upper end surface of the upper wall of the flow-distributing ejector 3.

[0035] The absorbent is transported to the uniform flow ejector by the circulation pump 10, and is injected into the flue gas through the injection port 604 of the uniform flow injection chamber 6. After being blocked by the upper demister 4 as the flue gas moves upward, the absorbent falls to the upper part of the uniform flow ejector 3, is collected, and then enters the absorption tower circulation tank 2 from the circulation reflux pipe 11, completing a circulation process.

[0036] The absorbent is injected through the injection holes 604 in the injection chamber 602. Upon entry, it is atomized into small droplets, which then mix thoroughly with the flue gas within the injection chamber 604 and the outlet diffusion chamber 603, flowing upward with the flue gas. After passing through the upper demister 4, the small absorbent droplets in the flue gas are captured and aggregated into larger droplets. Under the influence of gravity, they fall between the upper wall of the flow-balancing injector 3, the inner wall of the absorption tower 1, and the air guide 8 at the outlet. After accumulating to a certain volume and liquid level, the absorbent enters the absorbent circulation tank 2 through the circulation reflux pipe 11.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow-distributing spraying device for use in an absorption tower, comprising an absorption tower (1); characterized in that: The interior of the absorption tower (1) is provided with an absorbent circulation tank (2), a flow balancing ejector (3) and a demister (4) from bottom to top; the absorbent circulation tank (2) is filled with absorbent, one side of which is connected to the interior of the flow balancing ejector (3), and the other side is connected to the upper part of the flow balancing ejector (3) to form an absorbent circulation flow loop; a flue gas flow space is formed between the absorbent circulation tank (2) and the flow balancing ejector (3), and is connected to an external flue gas duct.

2. A uniform flow injection device for use in an absorption tower according to claim 1, characterized in that: A support base (5) is provided inside the absorption tower (1), and a flow-uniform ejector (3) is arranged on the support base (5).

3. A uniform flow injection device for use in an absorption tower according to claim 2, characterized in that: The uniform flow ejector (3) comprises a main body (301), a sealed cavity is provided inside the main body (301), the cavity is communicated with the absorbent circulation tank (2) so as to be filled with absorbent, and a group of uniform flow ejection chambers (6) are provided in the cavity, and the group of uniform flow ejection chambers (6) are vertically arranged and spaced apart.

4. A uniform flow injection device for use in an absorption tower according to claim 3, characterized in that: The uniform flow injection chamber (6) comprises an inlet contraction chamber (601), an injection chamber (602) and an outlet diffusion chamber (603) arranged in sequence from bottom to top; a group of penetrating injection ports (604) are provided on the wall of the injection chamber (602).

5. The uniform flow injection device for use in an absorption tower according to claim 4, characterized in that: The heights of the injection ports (604) on a group of uniform flow injection chambers (6) are all the same.

6. A uniform flow injection device for use in an absorption tower according to claim 4, characterized in that: A multi-layer flow-uniform support plate (7) is provided in the main body (301) for supporting a group of flow-uniform injection chambers (6). A group of flow guide holes (701) are provided on the flow-uniform support plate (7) for guiding the absorbent inside the main body (301) into the injection chamber (602) from the injection port (604).

7. A uniform flow injection device for use in an absorption tower according to claim 6, characterized in that: The guide hole (701) is arranged between two adjacent equal flow injection chambers (6).

8. The uniform flow injection device for use in an absorption tower according to claim 4, characterized in that: The structural dimensions of the inlet contraction cavity (601) gradually contract along the direction of smoke flow; and the structural dimensions of the outlet diffusion cavity (603) gradually expand along the direction of smoke flow.

9. The uniform flow injection device for use in an absorption tower according to claim 4, characterized in that: The upper portion of the main body (301) is provided with a group of air guide covers (8) communicating with the outlet diffusion chamber (603).

10. The uniform flow injection device for use in an absorption tower according to claim 1, characterized in that: One side of the absorbent circulation tank (2) is connected to the interior of the flow-equalizing ejector (3) via a circulation liquid inlet pipe (9), and the circulation liquid inlet pipe (9) is connected to a circulation pump (10); the other side of the absorbent circulation tank (2) is connected to the upper part of the flow-equalizing ejector (3) via a circulation return pipe (11), and the bottom of the pipe opening of the circulation return pipe (11) is flush with the upper end surface of the upper wall plate of the flow-equalizing ejector (3).

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