Desulfurizing tower

Abstract

The utility model relates to the technical field of coal gas desulfurization, in particular to a desulfurization tower. Comprising a tower body, a first oil removal device, a second oil removal device, a filler washing section, an alkali washing section and a demisting section, the tower body is a vertically arranged cylinder body, and the first oil removal device, the second oil removal device, the filler washing section, the alkali washing section and the demisting section are sequentially arranged in the tower body from bottom to top; the first oil removal device and the second oil removal device conduct first oil removal and second oil removal on coal gas, the filler washing section completes absorption of hydrogen sulfide in the coal gas by carbonate barren liquor, the alkali washing section achieves absorption of hydrogen sulfide by alkali liquor, and the demisting section removes fog drops entrained in the coal gas. The oil removal function is achieved, and the oil removal requirement can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas desulfurization, in particular to a desulfurization tower. Background Art

[0002] Vacuum carbonate desulfurization is a commonly used coal gas desulfurization process. Impurities such as wash oil and naphthalene carried by coal gas enter the desulfurization system and easily accumulate in the desulfurization rich solution. The desulfurization rich solution enters the regeneration tower, where the wash oil and naphthalene are desorbed along with H2S, HCN, and CO2 under vacuum conditions. These naphthalene deposits condense from the top of the regeneration tower along with the vacuum condensate, forming naphthalene deposits. These deposits are prone to clog the heat exchangers and separators of the vacuum pump system. Wash oil and naphthalene carried by coal gas can also deteriorate the circulating desulfurization solution, ultimately affecting H2S absorption.

[0003] However, the existing desulfurization tower only has an absorption function, which can meet the mass transfer requirements, but does not have an oil removal function and cannot meet the oil removal needs. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a desulfurization tower with an oil removal function, which can meet the demand for oil removal.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A desulfurization tower comprises a tower body, a first oil removal device, a second oil removal device, a packing washing section, an alkali washing section and a demisting section; the tower body is a vertically arranged cylinder, and the first oil removal device, the second oil removal device, the packing washing section, the alkali washing section and the demisting section are arranged in sequence from bottom to top in the tower body; the first and second oil removal devices perform the first and second oil removal on the coal gas, the packing washing section completes the absorption of hydrogen sulfide in the coal gas by carbonate lean liquid, the alkali washing section realizes the absorption of hydrogen sulfide by alkali liquid, and the demisting section removes droplets entrained in the coal gas.

[0007] Furthermore, the first oil removal device includes a first gas inlet, a first oil removal cylinder, a conical head, an oil drain port and a partition; the first gas inlet enters the tower body tangentially, the partition is horizontally arranged, fixedly connected to the inner wall of the tower body, and is located above the first gas inlet; the first oil removal cylinder is fixedly connected to the bottom surface of the partition and is coaxial with the tower body; the conical head is fixedly connected to the bottom of the tower body, and the oil drain port is fixedly connected to the bottom of the conical head.

[0008] Furthermore, the second oil removal device includes a conical top cover, a straight edge section, a connecting plate, a second oil removal cylinder, a flange and a fiber demister fixed in sequence from top to bottom; a plurality of the second oil removal devices are evenly distributed in the tower body.

[0009] Furthermore, the bottom of the fiber demister is conical.

[0010] Furthermore, it also includes a drain port, which is fixed to the tower body and located above the partition.

[0011] Furthermore, the packing washing section includes a carbonate lean liquid inlet, a nozzle, a packing and a packing support; the carbonate lean liquid inlet extends into the tower body, and multiple nozzles are fixedly connected to the carbonate lean liquid inlet in the tower body; the packing support is fixedly connected to the inner wall of the tower body, and the packing is placed on the packing support and is located below the carbonate lean liquid inlet.

[0012] Furthermore, the alkali washing section includes two groups of alkali washing components arranged opposite to each other, and the alkali washing components include a blocking plate, an alkali solution inlet, an installation port, an alkali washing nozzle, a pipe and an arc plate; the alkali washing partition is horizontally fixed in the tower body, the bottom surface of the arc plate is fixed on the alkali washing partition, the alkali washing partition is open here, the side surface of the arc plate is fixed to the inner wall of the tower body, and the blocking plate is fixed to the top of the arc plate; the alkali solution inlet extends into the tower body through the installation port, and extends into the arc plate and the pipe, and the alkali washing nozzle is fixed to the end of the alkali solution inlet.

[0013] Furthermore, it also includes an alkali liquid outlet, which is L-shaped, with a vertical section fixed to the alkali washing partition and a horizontal section extending out of the tower body.

[0014] Furthermore, the demisting section includes a first gas outlet, a top cover, a second gas inlet, a connecting pipe, the second gas outlet, a cone section and a liquid seal pipe; the top cover is fixedly connected to the top surface of the tower body, the first gas outlet is fixedly connected to the top cover and extends into the tower body; the second gas inlet and the second gas outlet both enter the tower body tangentially, the second gas inlet is located above the second gas outlet, and the second gas inlet and the second gas outlet are connected by a connecting pipe; the cone section is fixedly connected to the inner wall of the tower body, located below the first gas outlet, and the liquid seal pipe is fixedly connected to the bottom of the cone section.

[0015] Furthermore, it also includes a manhole and a skirt; the manhole is fixed to the side wall of the tower body, and the skirt is fixed to the bottom of the tower body.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model comprises a first deoiling device, a second deoiling device, a packing washing section, an alkali washing section, and a demisting section, arranged sequentially from bottom to top within the tower body. The first and second deoiling devices perform primary and secondary deoiling of the coal gas. The packing washing section completes the absorption of hydrogen sulfide in the coal gas by carbonate-lean liquid. The alkali washing section absorbs hydrogen sulfide with alkali liquid. The demisting section removes mist droplets entrained in the coal gas. This double deoiling of the coal gas, combined with the final demisting, provides excellent absorption and deoiling performance while preventing clogging.

[0018] 2. The alkali cleaning section of this utility model includes two sets of alkali cleaning components arranged opposite each other. The coal gas flows forward and collides with each other at the center of the desulfurization tower, achieving the final absorption of hydrogen sulfide in the coal gas. The use of impinging flow absorption ensures complete absorption and a compact structure.

[0019] 3. The demisting section of this utility model has a gas inlet and a second gas outlet that extend tangentially into the tower body. After absorbing the alkali solution, the gas flows tangentially out of the second gas outlet and into the demisting section tangentially along the gas inlet. The gas then passes through a cyclone to remove entrained gas droplets before flowing out of the first gas outlet. Using a cyclone to remove entrained gas droplets is simple to operate and prevents clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic front view of the structure of the utility model.

[0021] Figure 2 for Figure 1 AA cross-sectional view.

[0022] Figure 3 for Figure 1 BB cross-sectional view.

[0023] Figure 4 for Figure 1 CC cross-sectional view.

[0024] In the figure: 1 - tower body 2 - first oil removal device 21 - first gas inlet 22 - first oil removal cylinder 23 - conical head 24 - oil discharge port 25 - partition 26 - mounting hole 3 - second oil removal device 31 - conical top cover 32 - straight edge section 33 - connecting plate 34 - second oil removal cylinder 35 - flange 36 - fiber demister 37 - liquid discharge port 4 - packing washing section 41 - lean liquid inlet 42 - nozzle 43 - packing 44 - packing support 5 - alkali washing section 51 - blocking plate 52 - alkali solution inlet 53 - mounting port 54 - alkali washing nozzle 55 - pipe 56 - curved plate 57 - alkali washing partition 58 - alkali solution outlet 6 - demister section 61 - first gas outlet 62 - top cover 63 - second gas inlet 64 - connecting pipe 65 - second gas outlet 66 - conical section 67 - liquid seal pipe 7 - skirt 8 - manhole DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components.

[0028] For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] In the description of the present invention, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0032] [Example]

[0033] like Figure 1-4 As shown, a desulfurization tower includes a tower body 1, a first oil removal device 2, a second oil removal device 3, a filler washing section 4, an alkali washing section 5, a demisting section 6, a manhole 8 and a skirt 7.

[0034] The tower body 1 is a vertically arranged circular cylinder. The tower body 1 is fixed to a skirt 7, and a plurality of manholes 8 are evenly distributed on the side walls of the tower body.

[0035] The first oil removal device 2, the second oil removal device 3, the packing washing section 4, the alkali washing section 5, and the demisting section 6 are sequentially arranged in the tower body 1 from bottom to top. The first oil removal device 2 and the second oil removal device 3 perform the primary and secondary oil removal on the coal gas. The packing washing section 4 completes the absorption of hydrogen sulfide in the coal gas by the carbonate lean solution. The alkali washing section 5 realizes the absorption of hydrogen sulfide by the alkali solution. The demisting section 6 removes mist droplets entrained in the coal gas.

[0036] The first oil removal device 2 includes a first gas inlet 21, a first oil removal cylinder 22, a conical head 23, an oil discharge port 24, a partition 25, and a mounting hole 26. The first gas inlet 21 enters the tower body 1 tangentially. The partition 25 is arranged horizontally and fixed to the inner wall of the tower body, located above the first gas inlet 21. The first oil removal cylinder 22 is fixed to the bottom surface of the partition and is coaxial with the tower body 1. The conical head 23 is fixed to the bottom of the tower body 1. The oil discharge port 24 is an L-shaped tube, and the oil discharge port 24 is fixed to the bottom of the conical head 23. The gas enters the annular channel between the inner wall of the tower body 1 and the outer wall of the first oil removal cylinder 22 tangentially along the first gas inlet 21 for the first oil removal. The mounting hole 26 is fixed to the tower body 1, located between the first oil removal cylinder 22 and the conical head 23. The mounting hole 26 is used for the installation and replacement of the fiber mist eliminator 36.

[0037] The second oil removal device 3 includes a conical top cover 31, a straight-side section 32, a connecting plate 33, a second oil removal cylinder 34, a flange 35, a fiber demister 36, and a drain port 37, all fixed together from top to bottom. The conical top cover 31 is welded to the straight-side section 32, and the straight-side section 32, connecting plate 33, and second oil removal cylinder 34 are welded together. The flange 35 is connected to the fiber demister 36 via bolts and nuts. A downward flow channel for coal gas is formed between the straight-side section 32 and the second oil removal cylinder 34. The fiber demister 36 has a conical bottom, and the wash oil flows downward along the conical section by gravity into the oil drain port 24. The second oil removal cylinder 34 is fixed to the partition 25, and the fiber demister 36 is located within the first oil removal cylinder 22. The drain port 37 is fixed to the side wall of the tower body 1, located above and immediately adjacent to the partition 25.

[0038] The plurality of second oil removal devices 3 are evenly distributed around the tower body 1 to ensure that the coal gas entering the fiber demister 36 is uniform. At the same time, the upward coal gas entering the second oil removal cylinder 34 also evenly enters the bottom of the packing layer.

[0039] The packing washing section 4 includes a carbonate lean liquid inlet 41, nozzles 42, packing 43, and a packing support 44. The carbonate lean liquid inlet 41 extends horizontally into the tower body 1, and multiple nozzles 42 are fixedly attached to the carbonate lean liquid inlet 41 within the tower body. The packing support 44 is fixedly attached to the inner wall of the tower body 1, and the packing 43 is placed on the packing support 44 and located below the carbonate lean liquid inlet 41. The packing washing section 4 primarily completes the absorption of hydrogen sulfide from the coal gas by the carbonate lean liquid. The desulfurized rich liquid flows downward along the conical top cover 31 into the external space of the second deoiling cylinder 34 and is delivered to the regeneration tower through the drain port 37.

[0040] The alkali wash section 5 comprises two sets of alkali wash components, positioned opposite each other. These components include a blocking plate 51, an alkali solution inlet 52, a mounting port 53, an alkali wash nozzle 54, a pipe 55, and a curved plate 56. The alkali wash section 57 also includes an alkali wash baffle 57, which is horizontally fixed to the tower body 1. The bottom surface of the curved plate 56 is fixed to the alkali wash baffle 57, where the alkali wash baffle 57 is open. The ends of the curved plate 56 are fixed to the inner wall of the tower body 1. The space between the inner wall of the curved plate 56 and the inner wall of the tower body 1 forms a gas ascending channel.

[0041] A blocking plate 51 is fixed to the top of the curved plate 56, and a tube 55 is fixed to the side of the curved plate 56. Tube 55 is welded to a hole in the upper portion of the curved plate 56, serving as a gas passage. An alkali inlet 52 extends horizontally into the tower body through a mounting opening 53, extending into the curved plate 56 and tube 55. An alkali cleaning nozzle 54 is fixed to the end of the alkali cleaning inlet 52. Inside tube 55, the coal gas mixes with the alkali solution sprayed from the alkali cleaning nozzle 54, allowing the alkali solution to absorb the hydrogen sulfide. The coal gas flows forward, and at the center of the desulfurization tower, the two streams collide, ultimately absorbing the hydrogen sulfide in the gas.

[0042] It also includes an alkali liquid outlet 58 , which is an L-shaped pipe, with a vertical section fixed to the bottom surface of the alkali washing partition 57 and a horizontal section extending out of the tower body 1 .

[0043] The demisting section 6 includes a first gas outlet 61, a top cover 62, a second gas inlet 63, a connecting pipe 64, a second gas outlet 65, a tapered section 66, and a liquid seal pipe 67. The top cover 62 is fixed to the top surface of the tower body 1. The first gas outlet 61 is vertically arranged, coaxial with the tower body 1, fixed to the center of the top cover 62, and extends into the tower body 1. The second gas inlet 63 and the second gas outlet 65 both enter the tower body 1 tangentially. The second gas inlet 63 is located above the second gas outlet and is connected to the second gas inlet 63 and the second gas outlet 65 via a connecting pipe 64. The tapered section 66 is fixed to the inner wall of the tower body 1, located below the first gas outlet 61. The liquid seal pipe 68 is fixed to the bottom of the tapered section 66. The liquid seal pipe 68 is a U-shaped tube. The gas absorbed by the alkali solution flows out tangentially along the second gas outlet 65 and enters the demisting section 6 tangentially along the first gas inlet 63. The gas passes through the cyclone to remove the entrained gas droplets and flows out through the first gas outlet 61. The manhole 8 is fixed to the top cover 62.

[0044] The working principle and working process of this utility model are as follows:

[0045] The coal gas enters the annular passage between the inner wall of the tower body 1 and the outer wall of the first oil removal cylinder 22 along the first coal gas inlet 21 in a tangential direction, flows in a circular direction, and changes from linear motion to circular motion, so that the impurities such as washing oil in the coal gas hit the cylinder, the gas flow changes from linear motion to circular motion, and most of the rotating gas flow spirally flows downward along the inner wall of the cylinder towards the conical head 23, and in the rotating process, the centrifugal force is generated, the washing oil and other liquid drops with a relative density greater than that of the coal gas are thrown to the inner wall of the cylinder, and once the liquid drop particles contact the inner wall of the cylinder, they lose the radial inertia force and move downward along the wall surface under the action of the downward momentum and gravity to enter the oil discharge port 24.

[0046] The downward rotating coal gas approaches the center of the oil removal device due to the shrinkage of the conical section (the conical head 23). According to the principle of invariable rotation moment, the tangential velocity is continuously increased, and the centrifugal force on the washing oil is continuously strengthened, and when the coal gas reaches a certain position at the lower end of the conical section, it is reversed upward from the middle of the oil removal device in the same rotating direction, continues to flow spirally, and enters the first oil removal cylinder 22 upward. In the first oil removal cylinder 22, the coal gas passes through the uniform arrangement of the fiber mist eliminator 36, the bottom of the fiber mist eliminator 36 is conical, and the absorbed washing oil flows downward along the conical section into the oil discharge port 24.

[0047] The coal gas after oil removal rises along the second oil removal cylinder 34, passes through the space between the straight edge section 32 and the second oil removal cylinder 34, and flows downward to uniformly enter the bottom of the filler layer. The desulfurized rich liquid after absorption of the top filler layer flows downward along the conical top cover 31 into the external space of the second oil removal cylinder 34, and is sent to the regeneration tower through the liquid discharge port 37.

[0048] The desulfurization liquid cannot enter the lower oil removal section, and does not affect the quality of the washing oil. In the filler washing section, the absorption process of the carbonate lean liquid absorbing hydrogen sulfide in the coal gas is mainly completed. In the alkali washing section, the coal gas enters the inside of the pipe 55 along the arc-shaped plate 56, the coal gas is mixed with the alkali liquid sprayed by the alkali washing nozzle 54, the absorption of the alkali liquid to hydrogen sulfide is realized, and the coal gas flows forward. At the center of the desulfurization tower, the two gas streams collide with each other, and the final absorption of hydrogen sulfide in the coal gas is realized. The coal gas after the absorption of the alkali liquid flows out along the second coal gas outlet 55 in a tangential direction, enters the mist removal section 6 along the second coal gas inlet 63, removes the mist droplets entrained in the coal gas through cyclone mist removal, and flows out along the first coal gas outlet 61 to enter the next section.

[0049] The utility model carries out twice oil removal to the coal gas, twice absorption and final mist removal, the absorption effect is good, the oil removal effect is excellent, and can avoid blockage. The alkali washing section 5 adopts impinging stream absorption, the absorption is complete, and the structure is compact. The mist removal section 6 adopts cyclone mist removal, removes the liquid droplets entrained in the coal gas, and is simple to operate and does not block.

[0050] The above merely describes some specific embodiments of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A desulfurization tower, characterized in that: It includes a tower body, a first oil removal device, a second oil removal device, a filler washing section, an alkali washing section and a demisting section; The tower body is a vertically arranged cylinder, and the first oil removal device, the second oil removal device, the filler washing section, the alkali washing section and the demisting section are arranged in the tower body in sequence from bottom to top; The first and second oil removal devices carry out the first and second oil removal on the coal gas, the filler washing section completes the absorption of hydrogen sulfide in the coal gas by carbonate lean liquid, the alkali washing section realizes the absorption of hydrogen sulfide by alkali liquid, and the demisting section removes mist droplets entrained in the coal gas.

2. A desulfurization tower according to claim 1, characterized in that: The first oil removal device includes a first gas inlet, a first oil removal cylinder, a conical head, an oil drain port and a partition; the first gas inlet enters the tower body tangentially, the partition is horizontally arranged, fixedly connected to the inner wall of the tower body, and located above the first gas inlet; the first oil removal cylinder is fixedly connected to the bottom surface of the partition and is coaxial with the tower body; the conical head is fixedly connected to the bottom of the tower body, and the oil drain port is fixedly connected to the bottom of the conical head.

3. A desulfurization tower according to claim 1, characterized in that: The second oil removal device includes a conical top cover, a straight edge section, a connecting plate, a second oil removal cylinder, a flange and a fiber mist eliminator fixed in sequence from top to bottom; multiple second oil removal devices are evenly distributed in the tower body.

4. A desulfurization tower according to claim 3, characterized in that: The bottom of the fiber demister is conical.

5. A desulfurization tower according to claim 3, characterized in that: It also includes a liquid drain port, which is fixed to the tower body and located above the partition.

6. A desulfurization tower according to claim 1, characterized in that: The packing washing section includes a carbonate lean solution inlet, a nozzle, a packing and a packing support; The carbonate lean liquid inlet extends into the tower body, and a plurality of nozzles are fixedly connected to the carbonate lean liquid inlet in the tower body; The filler support is fixed to the inner wall of the tower body, and the filler is placed on the filler support and is located below the carbonate lean liquid inlet.

7. A desulfurization tower according to claim 1, characterized in that: The alkali washing section includes two sets of alkali washing components arranged opposite to each other, and the alkali washing components include a blocking plate, an alkali solution inlet, a mounting port, an alkali washing nozzle, a pipe and an arc plate; The alkali washing partition is fixed horizontally in the tower body, the bottom surface of the arc plate is fixed on the alkali washing partition, the alkali washing partition is open here, the side surface of the arc plate is fixed to the inner wall of the tower body, and the blocking plate is fixed to the top of the arc plate; The alkali solution inlet extends into the tower body through the installation port and extends into the arc plate and the pipe. The alkali cleaning nozzle is fixedly connected to the end of the alkali solution inlet.

8. A desulfurization tower according to claim 7, characterized in that: It also includes an alkali liquid outlet, which is L-shaped, with a vertical section fixed to the alkali washing partition and a horizontal section extending out of the tower body.

9. A desulfurization tower according to claim 1, characterized in that: The demisting section includes a first gas outlet, a top cover, a second gas inlet, a connecting pipe, a second gas outlet, a cone section and a liquid sealing pipe; The top cover is fixedly connected to the top surface of the tower body, and the first gas outlet is fixedly connected to the top cover and extends into the tower body; The second gas inlet and the second gas outlet both enter the tower body tangentially, the second gas inlet is located above the second gas outlet, and the second gas inlet and the second gas outlet are connected by a connecting pipe; The cone section is fixedly connected to the inner wall of the tower body and is located below the first gas outlet, and the liquid seal pipe is fixedly connected to the bottom of the cone section.

10. A desulfurization tower according to claim 1, characterized in that: It also includes a manhole and a skirt seat; the manhole is fixedly connected to the side wall of the tower body, and the skirt seat is fixedly connected to the bottom of the tower body.

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