Flow equalizing jet device used in absorption tower

Abstract

The invention 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 tank, the absorbent circulating flow loop and other structures, the device effectively improves the flow equalizing effect of the 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 invention belongs to the technical field of flue gas pollutant treatment, and in particular relates to a uniform flow injection device used in an absorption tower. Background Art

[0002] In the flue gas pollutant treatment system of the power, steel, and chemical industries, absorption is a commonly used flue gas pollutant treatment process, and its core equipment is the absorption tower. Conventional absorption towers include absorbent spray devices and flue gas equalization devices. In order to achieve higher process performance, the number of spray layers and the number of equalization device layers in the absorption tower are often increased, which not only increases the height of the absorption tower, but also increases the investment in equipment. Summary of the invention

[0003] In view of the above-mentioned problems existing in the prior art, the object of the present invention is to provide a flow equalization injection device for use in an absorption tower. By integrating the flow equalization 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 present invention 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 inside 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, and 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 injector includes a main body, a sealed cavity is provided inside the main body, the cavity is connected to the absorbent circulation groove so as to be filled with absorbent, and a group of uniform flow injection chambers are provided in the cavity, and the group of uniform flow injection chambers are vertically arranged and spaced apart.

[0007] Furthermore, the uniform flow injection chamber comprises an inlet contraction chamber, an injection chamber and an outlet diffusion chamber which are arranged in sequence 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-evening support plates are provided in the main body to support a group of flow-evening injection chambers, and a group of guide holes are provided on the flow-evening support plates to guide 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 chamber gradually shrink along the direction of smoke flow; and the structural dimensions of the outlet diffusion chamber gradually expand along the direction of smoke flow.

[0012] Furthermore, a group of air guide covers connected to 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 flow-equalizing 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 flow-equalizing 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 flow-equalizing ejector.

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

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

[0016] 2) The spraying is uniform, the absorbent and the flue gas are mixed, and the absorption effect is good: in the device of the present invention, the spray port of the flow-equalizing spray chamber is immersed in the absorbent, and the horizontal heights of all the spray ports in the flow-equalizing sprayer are the same. According to the Pascal principle, the static pressure of the absorbent at each spray port is the same; and the flow rate of the absorbent in the flow-equalizing sprayer is very low, and its dynamic pressure can be ignored, so the absorbent pressure received by each spray port is the same, and thus the absorbent flow rate and flow rate of each spray port are also the same; the uniformity of the absorbent spraying in each flow-equalizing sprayer 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 present invention, 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, and no additional reinforcement support components are required, 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 flow-balancing 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 with high precision. When overhaul is needed, the flow-balancing ejector can be disassembled as a whole to the outside of the absorption tower. The operation is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

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

[0021] Figure 3 It is a schematic diagram of the internal front view structure of the flow-balanced ejector of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution 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 of the specification. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.

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

[0025] Specifically, the flow-balancing injector 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 seat 5 is fixedly installed on the tower wall of the absorption tower 1, and the flow-balancing injector 3 is fixed on the support seat 5 by bolts.

[0026] The support seat 5 not only supports the flow-balancing injector 3, but also can seal the gap between the flow-balancing injector 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-averaging injection chambers 6 are vertically arranged inside the flow-averaging injector 3, and smoke passes from bottom to top through the flow-averaging injection chambers 6. Multiple flow-averaging injection chambers 6 can be evenly arranged inside the flow-averaging injector 3, or can be non-uniformly arranged according to the flow field simulation calculation.

[0028] The uniform flow injection chamber 6 comprises 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, contracting along the direction of the smoke, and its cone angle is 40°-60°. The injection chamber 602 is cylindrical, with an inner diameter of about 10mm-30mm and a length of about 150mm-300mm. There are 2-4 injection ports 604 on the wall of the injection chamber 602, and the inner diameter of the injection port is about 3mm-10mm. All injection ports 604 have the same height in the flow-equalizing injector 3, and the cone angle of the injection chamber is about 10°-20°. By adjusting the diameter of the inlet and outlet of the flow-equalizing injection chamber 6, the uniformity of the flow field after the smoke passes through the flow-equalizing injector can be achieved.

[0030] The outlet diffusion chamber 603 is conical and expands along the direction of the smoke. A group of air guide covers 8 communicating with the outlet diffusion chamber 603 are arranged on the upper wall plate of the main body 301, and the top of the air guide covers 8 is 300mm-600mm higher than the upper wall plate.

[0031] Specifically, multiple layers of flow balancing support plates 7 are arranged in the flow balancing injector 3. The flow balancing support plates 7 are connected to the side wall plates and the flow balancing injector cavity 6, and multiple flow guide holes 701 are evenly opened on the flow balancing support plates 7, so that the absorbent can 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 in the upper space of the flow-balancing ejector 3, and the absorbent circulation tank 2 is in the lower part of 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 an external flue gas pipeline through a flue gas inlet port 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-equalizing ejector 3 through a circulation liquid inlet pipe 9, and the circulation liquid inlet pipe 9 is connected to a circulation pump 10 to provide power. The other side of the absorbent circulation tank 2 is connected to the upper part of the flow-equalizing ejector 3 through 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.

[0035] The absorbent is transported to the flow-equalizing ejector by the circulation pump 10, and is injected into the flue gas through the injection port 604 of the flow-equalizing ejection 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 flow-equalizing 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 sprayed into the injection cavity 602 through the injection hole 604. After being sprayed, it is atomized into small droplets, which are fully contacted and mixed with the flue gas in the injection cavity 604 and the outlet diffusion cavity 603, and flow upward with the flue gas. After passing through the upper demister 4, the small droplets of absorbent in the flue gas are captured and gathered into large droplets. Under the action of gravity, they fall between the upper wall plate of the flow-equalizing 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 substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A uniform flow injection device for use in an absorption tower, comprising an absorption tower (1); characterized in that: The absorbent circulation tank (2), a flow equalizing ejector (3) and a demister (4) are arranged inside the absorption tower (1) from bottom to top; the absorbent circulation tank (2) is filled with absorbent, one side of which is connected to the inside of the flow equalizing ejector (3), and the other side is connected to the upper part of the flow equalizing 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 equalizing 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 connected to the absorbent circulation tank (2) so as to be filled with absorbent, 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) which are arranged in sequence from bottom to top; a group of penetrating injection ports (604) are provided on the chamber wall of the injection chamber (602).

5. A 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 plurality of layers of flow-balancing support plates (7) are arranged in the main body (301) for supporting a group of flow-balancing injection chambers (6); a group of flow guide holes (701) are arranged on the flow-balancing support plates (7) for guiding the absorbent inside the main body (301) to enter 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 flow guide hole (701) is arranged between two adjacent flow-averaging 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 chamber (601) gradually contract along the direction of smoke flow; and the structural dimensions of the outlet diffusion chamber (603) gradually expand along the direction of smoke flow.

9. A uniform flow injection device for use in an absorption tower according to claim 4, characterized in that: The upper part of the main body (301) is provided with a group of air guide covers (8) which are in communication 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-balancing 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-balancing 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-balancing ejector (3).

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