Moving bed adsorption tower

Abstract

The invention discloses a moving bed adsorption tower which comprises a tower body, two separators are arranged in the tower body and divide the tower body into an air inlet cavity, an adsorption cavity and an exhaust cavity, the tower body is provided with a feeding port and a discharging port, and an adsorbent falls into the adsorption cavity through the feeding port and is discharged out of the tower body through the discharging port. The separator is provided with a ventilation part allowing gas to pass through and preventing the adsorbent from passing through, the gas inlet cavity and the exhaust cavity are communicated with the adsorption cavity through the ventilation part, the tower body is provided with a gas inlet and a gas outlet, and flue gas sequentially passes through the gas inlet, the gas inlet cavity, the adsorption cavity, the exhaust cavity and the gas outlet and flows through the tower body to be adsorbed and purified. According to the moving bed adsorption tower disclosed by the invention, equipment such as an air inlet hopper and a discharging rake is omitted, so that the complexity of an adsorption system is greatly simplified, the processing difficulty and initial investment of the equipment are reduced, and the maintenance difficulty and the fault occurrence frequency are reduced. And moreover, corresponding control systems and power sources are reduced, and the operation energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas purification, and in particular to a moving bed adsorption tower. Background Art

[0002] With the increasing attention paid to industrial production and environmental protection, adsorption technology plays an important role in gas purification, separation and recovery of chemical products, etc. As a key equipment, adsorption tower is widely used in these processes. Its main function is to use adsorbents (such as activated carbon, molecular sieves, silica gel, etc.) to adsorb target substances in the gas to achieve the purpose of purification or separation.

[0003] In the related art, the adsorption tower includes a cylindrical tower body filled with an adsorbent. An air inlet is provided at the top of the tower body, an air outlet is provided at the bottom, and an inverted cone-shaped air inlet hopper is provided at the lower part of the adsorption tower, where a discharge rake and other equipment are provided. However, the adsorption tower in the related art has a complex structure, resulting in high processing costs and high energy consumption, as well as a high frequency of failures and inconvenient subsequent maintenance. Summary of the invention

[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0005] The manufacture and installation of the adsorption tower, inverted cone air intake hopper and discharge rake in the related technology require high costs. The setting of these equipment makes the structure of the adsorption tower more complicated, increasing the difficulty of design, manufacturing and maintenance. The adsorption tower with complex structure is prone to failure during operation, such as jamming and wear of the discharge rake. Due to the complexity of the equipment, once a problem occurs, the maintenance workload is large and requires a long downtime. In addition, its control system and power requirements are high, such as compressed air or electric drive, which increases energy consumption.

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, an embodiment of the present invention provides a moving bed adsorption tower with a simple structure, stable operation and easy maintenance.

[0008] The moving bed adsorption tower of the embodiment of the present invention includes a tower body, and two isolation members are arranged in the tower body and are spaced apart along the horizontal direction, and the two isolation members divide the cavity in the tower body into an air inlet chamber, an adsorption chamber and an exhaust chamber. The top of the tower body is provided with a feed port connected to the adsorption chamber, and the bottom of the tower body is provided with a discharge port connected to the adsorption chamber, so that the adsorbent falls into the adsorption chamber through the feed port and is discharged from the tower body through the discharge port. The isolation member has a ventilation portion that allows gas to pass through and prevents the adsorbent from passing through, so that the air inlet chamber and the exhaust chamber are connected to the adsorption chamber through the corresponding ventilation portions. The tower body is provided with an air inlet connected to the air inlet chamber and an air outlet connected to the exhaust chamber, so that the flue gas passes through the air inlet, the air inlet chamber, the adsorption chamber, the exhaust chamber and the air outlet in sequence and flows through the tower body for adsorption and purification.

[0009] The moving bed adsorption tower of the embodiment of the present invention greatly simplifies the complexity of the adsorption system by eliminating the air inlet hopper, unloading rake and other equipment, reduces the difficulty of equipment processing and initial investment, reduces the difficulty of maintenance and the frequency of failure. In addition, the corresponding control system and power source (compressed air or electric drive) are reduced, reducing the operating energy consumption.

[0010] In some embodiments, the isolation member includes a steel plate and a wire mesh arranged on the wall of the steel plate close to the adsorption chamber, the steel plate is provided with a plurality of evenly distributed through holes, the mesh diameter of the wire mesh is smaller than the diameter of the adsorbent, and the through holes of the steel plate and the mesh holes of the wire mesh together constitute the ventilation portion of the isolation member.

[0011] In some embodiments, the diameter of the through holes of the steel plate is larger than the mesh diameter of the wire mesh.

[0012] In some embodiments, the connection point between the air inlet and the air inlet cavity is located in the middle of the air inlet cavity, and the cross-sectional area of ​​the air inlet cavity gradually increases from away from the adsorption cavity to close to the adsorption cavity.

[0013] In some embodiments, the connection point between the gas outlet and the exhaust cavity is located in the middle of the exhaust cavity, and the cross-sectional area of ​​the exhaust cavity gradually increases from away from the adsorption cavity to close to the adsorption cavity.

[0014] In some embodiments, the connection points between the air inlet cavity and the exhaust cavity and the adsorption cavity are all horizontally arranged transition sections, the isolation member is arranged in the corresponding transition section, and the ratio of the distance between any isolation member and the adsorption cavity to the width of the adsorption cavity is 0.01 to 0.05.

[0015] In some embodiments, a buffer tank is provided on the top of the tower body, and the buffer tank is connected to the feed port via a pipeline. The pipeline between the buffer tank and the feed port is a drop chute, and the drop chute is vertically or inclined.

[0016] In some embodiments, there are multiple feed inlets, and the multiple feed inlets are spaced apart and distributed along the width direction of the adsorption chamber.

[0017] In some embodiments, a feed rotary valve is provided on the pipeline on the feed side of the buffer tank.

[0018] In some embodiments, a discharge rotary valve is provided on the pipeline on the discharge port side of the tower body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of an adsorption tower of the related art.

[0020] Figure 2 Schematic diagram of a moving bed adsorption tower according to an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of an isolation element according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 10-intake bucket, 20-discharging rake,

[0024] 1-tower body, 101-air inlet chamber, 102-adsorption chamber, 103-exhaust chamber, 104-feed port, 105-discharge port, 106-air inlet, 107-air outlet, 108-transition section, 2-isolator, 201-steel plate, 202-wire mesh, 3-buffer tank, 4-dropping chute, 5-feed rotary valve, 6-discharge rotary valve. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] The moving bed adsorption tower according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0027] like Figure 2 and Figure 3 As shown, the moving bed adsorption tower of the embodiment of the present invention includes a tower body 1, and two isolation members 2 are arranged in the tower body 1. The isolation members 2 are arranged in the vertical direction, and the upper and lower ends of the isolation members 2 are connected to the inner wall of the tower body 1. The two isolation members 2 are spaced apart and distributed in the horizontal direction. The two isolation members 2 divide the cavity in the tower body 1 into an air inlet chamber 101, an adsorption chamber 102 and an exhaust chamber 103.

[0028] The top of the tower body 1 is provided with a feed port 104, which is communicated with the upper space of the adsorption chamber 102, and the bottom of the tower body 1 is provided with a discharge port 105, which is communicated with the lower space of the adsorption chamber 102. For example, the adsorbent transported from the regeneration tower of the flue gas purification system of the power plant through the pipeline enters the tower body 1 through the feed port 104, and the adsorbent moves from top to bottom under the action of gravity, falls to the discharge port 105 in the adsorption chamber 102, and then is discharged from the tower body 1 through the discharge port 105, and then transported back to the regeneration tower through the pipeline.

[0029] The spacer 2 has a vent that allows gas to pass through and prevents the adsorbent from passing through. The air inlet cavity 101 and the exhaust cavity 103 are connected to the adsorption cavity 102 through the corresponding vents. An air inlet 106 is provided on one side of the tower body 1 close to the air inlet cavity 101, and the air inlet 106 is connected to the air inlet cavity 101. An air outlet 107 is provided on one side of the tower body 1 close to the exhaust cavity 103, and the air outlet 107 is connected to the exhaust cavity 103. For example, the flue gas transported from the boiler of the power plant enters the air inlet chamber 101 through the air inlet 106, flows from the air inlet chamber 101 into the adsorption chamber 102 through the ventilation portion on the isolation piece 2 between the air inlet chamber 101 and the adsorption chamber 102, and is adsorbed and purified under the action of the adsorbent. The purified flue gas flows from the adsorption chamber 102 into the exhaust chamber 103 through the ventilation portion on the isolation piece 2 between the adsorption chamber 102 and the exhaust chamber 103, and finally flows out of the tower body 1 through the air outlet 107 and flows to the next stage of the process.

[0030] Therefore, the moving bed adsorption tower of the embodiment of the present invention can be eliminated by Figure 1 The air intake hopper 10, the unloading rake 20 and other equipment in the related art shown greatly simplify the complexity of the adsorption system, reduce the difficulty of equipment processing and initial investment, reduce the difficulty of maintenance and the frequency of failure. In addition, the corresponding control system and power source (compressed air or electric drive) are reduced, reducing the operating energy consumption.

[0031] In some embodiments, Figure 2 and Figure 3 As shown, the isolation member 2 includes a steel plate 201 and a wire mesh 202. The steel plate 201 is vertically arranged, and the wire mesh 202 is arranged on the wall of the steel plate 201 close to the adsorption chamber 102. The steel plate 201 is provided with a plurality of evenly distributed through holes, and the through holes of the steel plate 201 and the mesh holes of the wire mesh 202 are interconnected, thereby forming a ventilation portion of the isolation member 2 together.

[0032] It can be understood that the two isolation members 2 are mainly used to restrict the adsorbent in the adsorption chamber 102 from moving from top to bottom while providing a flow channel for the flue gas. The steel plate 201 is mainly used as a support. The diameter of the through hole on the steel plate 201 is larger than the mesh diameter of the wire mesh 202, so that the flue gas can flow through the steel plate 201 better. The mesh diameter of the wire mesh 202 is smaller than the diameter of the adsorbent to ensure that the adsorbent will not leak into the air inlet chamber 101 and the exhaust chamber 103.

[0033] Optionally, the diameter of the through hole of the steel plate 201 is 30 mm to 60 mm, and the wire mesh 202 is a stainless steel wire mesh with 12 to 16 meshes.

[0034] In some embodiments, Figure 2 As shown, the connection between the air inlet 106 and the air inlet chamber 101 is located in the middle of the air inlet chamber 101, and the cross-sectional area of ​​the air inlet chamber 101 gradually increases from away from the adsorption chamber 102 to close to the adsorption chamber 102, so that the flue gas gathers and flows into the middle of the air inlet chamber 101, gradually diffuses evenly, and makes the amount of flue gas flowing into the adsorption chamber 102 as uniform as possible.

[0035] Furthermore, if Figure 2 As shown, the connection point between the air outlet 107 and the exhaust chamber 103 is located in the middle of the exhaust chamber 103, and the cross-sectional area of ​​the exhaust chamber 103 gradually increases from away from the adsorption chamber 102 to close to the adsorption chamber 102, so that the purified flue gas can evenly enter the exhaust chamber 103, and then gather at the air outlet 107 for discharge, so as to connect to the subsequent pipeline.

[0036] In some embodiments, Figure 2 As shown, the connection points between the air inlet chamber 101 and the exhaust chamber 103 and the adsorption chamber 102 are all horizontally arranged transition sections 108, the isolation member 2 is arranged in the corresponding transition section 108, and the ratio of the distance between any isolation member 2 and the adsorption chamber 102 to the width of the adsorption chamber 102 is 0.01 to 0.05.

[0037] Alternatively, if Figure 2 As shown, the distance between the partition 2 between the air inlet chamber 101 and the adsorption chamber 102 and the adsorption chamber 102 is L1, and the distance between the partition 2 between the exhaust chamber 103 and the adsorption chamber 102 and the adsorption chamber 102 is L2, and both L1 and L2 need to be greater than or equal to 100 mm, so as to prevent the smoke from directly entering the unfilled adsorbent portion at the top of the adsorption chamber 102 from the air inlet chamber 101, that is, to prevent the occurrence of Figure 2 The flue gas flow direction shown by the middle dotted line is used to prevent flue gas short-circuiting, thereby improving the flue gas purification effect of the moving bed adsorption tower in the embodiment of the present invention.

[0038] In some embodiments, Figure 2As shown, a buffer tank 3 is provided on the top of the tower body 1, and the buffer tank 3 is connected to the feed port 104 through a pipeline. The pipeline between the buffer tank 3 and the feed port 104 is a material drop chute 4, and the material drop chute 4 is vertically or inclinedly arranged.

[0039] It is understandable that the adsorbent transported from the regeneration tower first enters the buffer tank 3 and then falls into the adsorption chamber 102 of the tower body 1 through the drop chute 4, thereby increasing the fullness of the adsorbent at the top of the adsorption chamber 102 and reducing the vacancy of the adsorbent.

[0040] Optionally, there are multiple feed inlets 104 , which are spaced apart along the width direction of the adsorption chamber 102 , so that the adsorbent can evenly fall into the adsorption chamber 102 , further improving the fullness of the adsorbent at the top of the adsorption chamber 102 .

[0041] In some embodiments, Figure 2 As shown, a feed rotary valve 5 is provided on the pipeline from the regeneration tower to the buffer tank 3 , and the feed rotary valve 5 is used to control the frequency of the adsorbent entering the buffer tank 3 .

[0042] Furthermore, if Figure 2 As shown, a discharge rotary valve 6 is provided on the pipeline connecting the discharge port 105 of the tower body 1 to the regeneration tower, and the discharge rotary valve 6 is used to control the discharge speed.

[0043] Thus, the rotary valve can be opened and closed quickly, which is beneficial to the continuous operation of the moving bed adsorption tower of the embodiment of the present invention, ensures that the adsorption and regeneration processes proceed smoothly, and improves production efficiency.

[0044] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A moving bed adsorption tower, characterized in that: It includes a tower body, on which are provided two partitions spaced apart in a horizontal direction, the two partitions divide the cavity in the tower body into an air inlet chamber, an adsorption chamber and an exhaust chamber, the top of the tower body is provided with a feed port connected to the adsorption chamber, the bottom of the tower body is provided with a discharge port connected to the adsorption chamber, so that the adsorbent falls into the adsorption chamber through the feed port and is discharged from the tower body through the discharge port, the partition has a vent portion that allows gas to pass through and prevents the adsorbent from passing through, so that the air inlet chamber and the exhaust chamber are connected to the adsorption chamber through the corresponding vent portions, the tower body is provided with an air inlet connected to the air inlet chamber and an air outlet connected to the exhaust chamber, so that the flue gas passes through the air inlet, the air inlet chamber, the adsorption chamber, the exhaust chamber and the air outlet in sequence and flows through the tower body for adsorption and purification.

2. The moving bed adsorption tower according to claim 1, characterized in that: The isolation member includes a steel plate and a wire mesh arranged on the wall of the steel plate close to the adsorption chamber, the steel plate is provided with a plurality of evenly distributed through holes, the mesh diameter of the wire mesh is smaller than the diameter of the adsorbent, and the through holes of the steel plate and the mesh holes of the wire mesh together constitute the ventilation part of the isolation member.

3. The moving bed adsorption tower according to claim 2, characterized in that: The diameter of the through holes of the steel plate is greater than the mesh diameter of the wire mesh.

4. The moving bed adsorption tower according to claim 1, characterized in that: The connection point between the air inlet and the air inlet cavity is located in the middle of the air inlet cavity, and the cross-sectional area of ​​the air inlet cavity gradually increases from away from the adsorption cavity to close to the adsorption cavity.

5. The moving bed adsorption tower according to claim 4, characterized in that: The connection point between the gas outlet and the exhaust cavity is located in the middle of the exhaust cavity, and the cross-sectional area of ​​the exhaust cavity gradually increases from away from the adsorption cavity to close to the adsorption cavity.

6. The moving bed adsorption tower according to claim 5, characterized in that: The connection points between the air inlet cavity and the exhaust cavity and the adsorption cavity are all horizontally arranged transition sections, the isolation member is arranged in the corresponding transition section, and the ratio of the distance between any isolation member and the adsorption cavity to the width of the adsorption cavity is 0.01 to 0.

05.

7. The moving bed adsorption tower according to claim 1, characterized in that: A buffer tank is provided on the top of the tower body, and the buffer tank is connected with the feed port via a pipeline. The pipeline between the buffer tank and the feed port is a material drop chute, and the material drop chute is vertically or inclinedly arranged.

8. The moving bed adsorption tower according to claim 7, characterized in that: There are multiple feed inlets, and the multiple feed inlets are distributed at intervals along the width direction of the adsorption chamber.

9. The moving bed adsorption tower according to claim 7, characterized in that: A feed rotary valve is provided on the pipeline on the feed side of the buffer tank.

10. The moving bed adsorption tower according to any one of claims 1 to 9, characterized in that: A discharge rotary valve is arranged on the pipeline on the discharge port side of the tower body.

Images