Crude benzene condensing and cooling equipment

Abstract

The utility model relates to the technical field of crude benzene distillation in coal gas purification, in particular to crude benzene condensing and cooling equipment. Comprising a crude benzene condenser and a crude benzene cooler; the body of the crude benzene condenser is vertically arranged, the body of the crude benzene cooler is horizontally arranged, and the body of the crude benzene condenser is communicated with the body of the crude benzene cooler; the crude benzene condenser adopts a spiral plate type condenser, and the crude benzene cooler adopts a shell-and-tube heat exchanger. The device is compact in structure, small in occupied area, low in investment, high in heat transfer efficiency and capable of greatly improving the crude benzene treatment capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of crude benzene distillation in coal gas purification, in particular to crude benzene condensation and cooling equipment. Background Art

[0002] In the process of coal gas purification, washing oil is usually used to absorb benzene in coal gas. The rich oil that absorbs benzene is distilled, and the rich oil is debenzened to obtain lean washing oil, and the operation of absorbing benzene in coal gas is continued. The operation of the debenzene tower has positive pressure and negative pressure operation. In the debenzene tower operated at negative pressure, the outlet benzene vapor is about 70℃ and directly enters the benzene vapor condenser cooler for condensation and cooling. In the debenzene tower operated at positive pressure, the outlet benzene vapor is about 90℃, and after heat exchange with the rich oil through the oil-gas heat exchanger, it directly enters the benzene vapor condenser cooler at about 70℃ for condensation and cooling.

[0003] However, the existing crude benzene condenser usually adopts a shell and tube heat exchanger, which not only has a low heat transfer coefficient, a large equipment area, and a high investment; but also with the expansion of the scale of the coking plant, the crude benzene processing volume continues to increase, and the existing crude benzene condensation cooling cannot meet the demand. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a crude benzene condensation cooling device with compact structure, small footprint, low investment, high heat transfer efficiency, and the ability to significantly increase the crude benzene processing capacity.

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

[0006] A crude benzene condensation and cooling device comprises a crude benzene condenser and a crude benzene cooler; the body of the crude benzene condenser is arranged vertically, the body of the crude benzene cooler is arranged horizontally, and the bodies of the crude benzene condenser and the crude benzene cooler are connected; the crude benzene condenser adopts a spiral plate condenser, and the crude benzene cooler adopts a shell and tube heat exchanger.

[0007] Furthermore, there are multiple crude benzene condensers, which are arranged in parallel.

[0008] Furthermore, the crude benzene condenser includes an upper tube box, a second spiral plate heat exchanger, a cylinder and a first spiral plate heat exchanger which are arranged in sequence from top to bottom; the second spiral plate heat exchanger has the same structure as the first spiral plate heat exchanger and is symmetrically arranged; the circulating water connecting pipe is arranged vertically, one end of the circulating water connecting pipe is connected to the second spiral plate heat exchanger, and the other end is connected to the first spiral plate heat exchanger.

[0009] Furthermore, the upper tube box includes a benzene vapor inlet, a head and an upper tube box cylinder which are arranged in sequence from top to bottom, and the conical plate is fixedly connected to the head through a connecting plate, and a through hole is provided on the conical plate.

[0010] Furthermore, the second spiral plate heat exchanger includes a semi-cylindrical body, a first spiral plate and a second spiral plate. The first spiral plate and the second spiral plate are located at the center of the semi-cylindrical body. The first spiral plate and the second spiral plate correspond to, are symmetrical to, and contain each other. The first spiral plate and the second spiral plate are separated by a partition.

[0011] Furthermore, the first spiral plate is provided with a distance bar, the width of which is the width of the spiral plate channel, which plays a distance role, and is connected from top to bottom to serve as a benzene vapor channel; the second spiral plate is provided with a convex groove, the height of which is the width of the spiral plate channel, which plays a distance role; a cylinder is fixedly connected to both ends of the second spiral plate, the diameter of the cylinder is consistent with the height of the convex groove, forming a closed cavity as a circulating water channel.

[0012] Furthermore, a semicircular plugging plate is provided at the bottom of the semi-cylindrical body, and the circulating water connecting pipe is connected to the semi-circular plugging plate as a circulating water channel; a through hole is provided on the side wall of the semi-cylindrical body, and the side wall of the semi-cylindrical body is connected to the semi-circular box body, and the semi-circular box body is connected to the circulating water interface; the circulating water interface of the first spiral plate heat exchanger is the circulating water inlet, and the circulating water interface of the second spiral plate heat exchanger is the circulating water inlet.

[0013] Furthermore, the shell and tube heat exchanger, the first spiral plate heat exchanger, the second spiral plate heat exchanger and the upper box body are all provided with flanges, the shell and tube heat exchanger and the first spiral plate heat exchanger are connected with bolts, and the second spiral plate heat exchanger and the upper tube box are connected with bolts.

[0014] Furthermore, the shell and tube heat exchanger is a fixed tube sheet heat exchanger, a U-tube heat exchanger or a floating head heat exchanger.

[0015] Furthermore, the fixed tube sheet heat exchanger includes a first tube box, an intermediate tube box and a second tube box connected in sequence; the low-temperature water inlet and the vent are fixedly connected to the first tube box; the tube bundle is arranged in the intermediate tube box, the support, the crude benzene outlet, and the first vent are fixedly connected to the bottom of the intermediate tube box, and the L-shaped interface is connected to the crude benzene outlet; the low-temperature water outlet and the second vent are fixedly connected to the second tube box.

[0016] Compared with the prior art, the utility model has at least the following technical effects or advantages:

[0017] 1. The utility model adopts a combination of spiral plate condensation and shell and tube cooling. The crude benzene condenser adopts a spiral plate condenser, which has high heat transfer efficiency, small size but large heat exchange area, and large crude benzene processing capacity.

[0018] 2. The utility model has multiple crude benzene condensers, which are arranged in parallel and use spiral plates in parallel to increase the heat exchange area, thereby increasing the crude benzene processing capacity.

[0019] 3. The spiral plate heat exchanger of the utility model is provided with a first spiral plate and a second spiral plate. The second spiral plate is provided with a convex groove, the height of which is the width of the spiral plate channel and serves as a distance gauge. The second spiral plate on the circulating water side of the spiral plate adopts a spiral plate pressed convex groove type instead of a distance column, which has good force and does not fall off.

[0020] 4. The first spiral plate of the utility model is provided with a distance bar, the width of which is the width of the spiral plate channel, which plays a distance role and is connected up and down to serve as a benzene vapor channel; the first spiral plate on the spiral plate circulating benzene vapor side adopts a distance bar structure, the position of which is consistent with the pressed convex groove, and the force is good to ensure the condensation of benzene vapor.

[0021] 5. The crude benzene outlet of the fixed tube sheet heat exchanger of the utility model is fixedly connected to the bottom of the intermediate tube box, and the L-shaped interface is connected to the crude benzene outlet; the L-shaped interface can control the height of the benzene liquid level to ensure the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic front view of the structure of the utility model.

[0023] Figure 2 It is a schematic side view of the structure of the utility model.

[0024] Figure 3 It is a schematic front view of the structure of the II spiral plate heat exchanger of the utility model.

[0025] Figure 4 It is a schematic top view of the structure of the II spiral plate heat exchanger of the utility model.

[0026] Figure 5 It is a schematic front view of the first spiral plate structure of the utility model.

[0027] Figure 6 It is a schematic bottom view of the first spiral plate structure of the utility model.

[0028] Figure 7 It is a schematic front view of the second spiral plate structure of the utility model.

[0029] Figure 8 It is a schematic bottom view of the second spiral plate structure of the utility model.

[0030] Fig. 9 It is a schematic diagram of the installation of the first spiral plate and the second spiral plate of the utility model.

[0031] In the figure: 1-shell and tube heat exchanger 2-I spiral plate heat exchanger 3-cylinder 4-manhole 5-circulating water connecting pipe 6-II spiral plate heat exchanger 7-upper tube box 11-benzene vapor inlet 12-head 13-first connecting plate 14 conical plate 15-upper tube box cylinder 16-upper tube box flange 21-support ring 22-center partition 23-semicircular plugging plate 24-round steel 25-second connecting plate 26-circulating water interface 27-semicircular box 28-semicircular cylinder 29-first spiral plate 30-second spiral plate 31-sealing plate 32-II spiral plate heat exchanger flange 33-distance bar 41-left tube box 42-low temperature water inlet 43-support 44-first vent 45-crude benzene outlet 46-L-type interface 47-tube bundle 48-second vent hole 49-right tube box 50-low temperature water outlet 51-benzene inlet 52-vent DETAILED DESCRIPTION

[0032] 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 combination 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 by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width" and "

[0034] The directions or positional relationships indicated by terms such as “degree”, “thickness”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial” and “circumferential” are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0035] In the description of the present utility model, 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 the internal connection of two elements.

[0036] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the description of the utility model, 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 utility model. 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the utility model. 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 technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0039] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0040] [Example]

[0041] like Figure 1-9 As shown, a crude benzene condensation and cooling device comprises a crude benzene condenser and a crude benzene cooler; the body of the crude benzene condenser is vertically arranged, the body of the crude benzene cooler is horizontally arranged, and the body of the crude benzene condenser is connected to the body of the crude benzene cooler; the crude benzene condenser adopts a spiral plate condenser, and the crude benzene cooler adopts a shell and tube heat exchanger 1.

[0042] In this embodiment, there are two crude benzene condensers, which are arranged in parallel and fixedly connected to the shell and tube heat exchanger 1 in parallel.

[0043] The crude benzene condenser includes an upper tube box 7, a second spiral plate heat exchanger 6, a cylinder 3 and a first spiral plate heat exchanger 2 which are arranged in sequence from top to bottom. The second spiral plate heat exchanger 6 has the same structure as the first spiral plate heat exchanger 2 and is symmetrically arranged. The cylinder 3 is arranged vertically and is located between the second spiral plate heat exchanger 6 and the first spiral plate heat exchanger 2, and the manhole 4 is fixed to the side of the cylinder 3. The circulating water connecting pipe 5 is arranged vertically and is located in the cylinder 3. The top end of the circulating water connecting pipe 5 is connected to the second spiral plate heat exchanger 6, and the bottom end is connected to the first spiral plate heat exchanger 2.

[0044] The upper pipe box 7 includes a benzene vapor inlet 11, a head 12, a first connecting plate 13, a conical plate 14, an upper pipe box body 15, and an upper pipe box flange 16. The benzene vapor inlet 11, the head 12, the upper pipe box body 15, and the upper pipe box flange 16 are connected from top to bottom, and the conical plate 14 is welded in the head 12 through the first connecting plate 13. The conical plate 14 is a benzene vapor distribution plate with a plurality of small holes.

[0045] The II spiral plate heat exchanger 6 includes a support ring 21, a central partition plate 22, a semicircular blocking plate 23, a round steel 24, a second connecting plate 25, a circulating water interface 26, a semicircular box body 27, a semi-cylindrical body 28, a first spiral plate 29, a second spiral plate 30, a sealing plate 31, a II spiral plate heat exchanger flange 32 and a distance bar 33.

[0046] The first spiral plate 29 and the second spiral plate 30 are located at the center of the semi-cylindrical body 28 . The first spiral plate 29 and the second spiral plate 30 correspond to, are symmetrical to, and include each other. The first spiral plate 29 and the second spiral plate 30 are separated by a central partition plate 22 .

[0047] The second spiral plate 30 is a flat plate with a circular convex groove, the height of which is the width of the spiral plate channel, and acts as a spacing column. The cylinder 24 is fixed to both ends of the second spiral plate 30, and the diameter of the round steel 24 is consistent with the height of the convex groove, forming a closed cavity as a circulating water channel.

[0048] The first spiral plate 29 is a flat plate welded with a distance bar 33. The width of the distance bar 33 is the width of the spiral plate channel and acts as a distance column. The distance bar 33 can be round steel or flat steel, which runs through from top to bottom and serves as a benzene vapor channel.

[0049] A semicircular plugging plate 23 is provided at the end of the semi-cylindrical body 28, and the circulating water connecting pipe 5 is connected to the semicircular plugging plate 23. The top end of the circulating water connecting pipe 5 is connected to the semicircular plugging plate 23 at the bottom end of the second spiral plate heat exchanger 6, and the bottom end of the circulating water connecting pipe 5 is connected to the semicircular plugging plate 23 at the top end of the first spiral plate heat exchanger 2, and the circulating water connecting pipe 5 serves as a circulating water channel.

[0050] The semicircular box 27 is welded with the semicircular cylinder 28. A plurality of holes are opened inside the semicircular box 27 to ensure that the circulating water enters the spiral evenly. The circulating water interface 26 of the first spiral plate heat exchanger 2 is the circulating water inlet, and the circulating water interface 26 of the second spiral plate heat exchanger 6 is the circulating water outlet.

[0051] The shell and tube heat exchanger 1, the first spiral plate heat exchanger 2, the second spiral plate heat exchanger 6 and the upper box body 7 are all provided with flanges, the shell and tube heat exchanger 1 and the first spiral plate heat exchanger 2 are connected by bolts, and the second spiral plate heat exchanger 6 and the upper tube box 7 are connected by bolts.

[0052] The shell and tube heat exchanger 1 is a fixed tube sheet heat exchanger or a U-tube heat exchanger or a floating head heat exchanger. In this embodiment, a fixed tube sheet heat exchanger is used.

[0053] The fixed tube sheet heat exchanger includes a left tube box 41, an intermediate tube box, a low-temperature water inlet 42, a support 43, a first vent 44, a crude benzene outlet 45, an L-shaped interface 46, a tube bundle 47, a second vent 48, a right tube box 49, a low-temperature water outlet 50, a benzene inlet 51 and a vent 52.

[0054] The left pipe box 41, the middle pipe box, and the right pipe box 49 are connected in sequence, the low-temperature water inlet 42 and the vent 52 are fixed to the left pipe box 41; the tube bundle 47 is arranged in the middle pipe box, the support 43, the crude benzene outlet 45, and the first vent 44 are fixed to the bottom of the middle pipe box, and the L-shaped interface 46 is connected to the crude benzene outlet 45; the low-temperature water outlet 50 and the second vent 48 are fixed to the right pipe box 49. The L-shaped interface 46 is used to control the height of the benzene liquid level, and the upper part is connected to the process pipeline.

[0055] The process principle and working process of the utility model are as follows:

[0056] Benzene vapor at about 70°C from the debenzene tower directly enters the benzene vapor inlet 11 of the benzene vapor condenser cooler, passes through the conical plate 14, and is distributed to the benzene vapor channel of the II spiral plate heat exchanger 6, and flows downward along the space formed by the distance bars 33. Under the indirect cooling of the circulating water in the adjacent space, the benzene vapor gradually condenses, and the benzene vapor continues to move downward along the cylinder 3 into the I spiral plate heat exchanger 2, and the benzene vapor gradually condenses into benzene, and enters the shell and tube heat exchanger 1 for benzene cooling, and finally is connected to the process pipeline along the upper part of the L-shaped interface, enters the oil-water separator, and the crude benzene after water is separated flows into the reflux tank, part of the crude benzene is sent to the top of the debenzene tower as reflux, and the rest is sent to the crude benzene intermediate tank as a product.

[0057] In the condensation section, the circulating water enters the first spiral plate heat exchanger 2 from the circulating water inlet, is evenly distributed to the spiral plate channel, flows from outside to inside along the spiral, flows from inside to outside along the circulating water connecting pipe 5 to the second spiral plate heat exchanger 6, and is discharged from the circulating water outlet. The circulating water and the benzene vapor flow in the opposite direction. In the cooling section, low-temperature water enters from the bottom of the cooler and flows out from the top, flowing in the opposite direction to the benzene. The L-shaped interface 46 is used to control the benzene liquid level to ensure that the liquid benzene is cooled to 20-30°C before being discharged.

[0058] The utility model adopts a combination of spiral plate condensation and shell and tube cooling. The crude benzene condenser adopts a spiral plate condenser, which has high heat transfer efficiency, small volume but large heat exchange area, and large crude benzene processing capacity. The utility model has multiple crude benzene condensers, and multiple crude benzene condensers are arranged in parallel. The spiral plates are operated in parallel to increase the heat exchange area, thereby increasing the crude benzene processing capacity.

[0059] The second spiral plate 30 is provided with a convex groove, the height of which is the width of the spiral plate channel, which plays a role of spacing; the second spiral plate 30 on the spiral plate circulating water side adopts a spiral plate pressed convex groove type instead of a distance column, which has good force and does not fall off. The first spiral plate is provided with a distance bar 33, the width of which is the width of the spiral plate channel, which plays a role of spacing, and is connected from top to bottom, serving as a benzene vapor channel; the first spiral plate 29 on the spiral plate circulating benzene vapor side adopts a distance bar 33 structure, the position is consistent with the pressed convex groove, and has good force, ensuring the condensation of benzene vapor.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crude benzene condensation and cooling device, characterized in that: It includes a crude benzene condenser and a crude benzene cooler; The body of the crude benzene condenser is arranged vertically, the body of the crude benzene cooler is arranged horizontally, and the body of the crude benzene condenser is connected to the body of the crude benzene cooler; The crude benzene condenser adopts a spiral plate condenser, and the crude benzene cooler adopts a shell and tube heat exchanger.

2. A crude benzene condensation and cooling device according to claim 1, characterized in that: There are multiple crude benzene condensers, and the multiple crude benzene condensers are arranged in parallel.

3. A crude benzene condensation and cooling device according to claim 1, characterized in that: The crude benzene condenser comprises an upper tube box, a second spiral plate heat exchanger, a cylinder and a first spiral plate heat exchanger which are arranged in sequence from top to bottom; The structure of the second spiral plate heat exchanger is the same as that of the first spiral plate heat exchanger, and they are symmetrically arranged; The circulating water connecting pipe is arranged vertically, one end of the circulating water connecting pipe is connected to the second spiral plate heat exchanger, and the other end is connected to the first spiral plate heat exchanger.

4. A crude benzene condensation and cooling device according to claim 3, characterized in that: The upper tube box comprises a benzene vapor inlet, a sealing head and an upper tube box cylinder which are sequentially arranged from top to bottom. The conical plate is fixedly connected to the sealing head through a connecting plate, and a through hole is arranged on the conical plate.

5. The crude benzene condensation and cooling equipment according to claim 3 is characterized in that: The second spiral plate heat exchanger includes a semi-cylindrical body, a first spiral plate and a second spiral plate. The first spiral plate and the second spiral plate are located at the center of the semi-cylindrical body. The first spiral plate and the second spiral plate correspond to, are symmetrical to, and include each other. The first spiral plate and the second spiral plate are separated by a partition.

6. A crude benzene condensation and cooling device according to claim 5, characterized in that: The first spiral plate is provided with a distance bar, the width of which is the same as the width of the spiral plate channel, which plays a distance role and is connected vertically to serve as a benzene vapor channel; The second spiral plate is provided with a convex groove, the height of which is the width of the spiral plate channel and serves as a distance meter; a cylinder is fixedly connected to both ends of the second spiral plate, the diameter of the cylinder is consistent with the height of the convex groove, forming a closed cavity as a circulating water channel.

7. The crude benzene condensation and cooling equipment according to claim 5, characterized in that: A semicircular plugging plate is provided at the bottom of the semi-cylindrical body, and a circulating water connecting pipe is connected to the semicircular plugging plate to serve as a circulating water channel; The side wall of the semi-cylindrical body is provided with a through hole, the side wall of the semi-cylindrical body is connected with the semi-circular box body, and the semi-circular box body is connected with the circulating water interface; The circulating water interface of the first spiral plate heat exchanger is the circulating water inlet, and the circulating water interface of the second spiral plate heat exchanger is the circulating water outlet.

8. The crude benzene condensation and cooling equipment according to claim 3, characterized in that: The shell and tube heat exchanger, the first spiral plate heat exchanger, the second spiral plate heat exchanger and the upper box body are all provided with flanges. The shell and tube heat exchanger and the first spiral plate heat exchanger are connected with bolts, and the second spiral plate heat exchanger and the upper tube box are connected with bolts.

9. The crude benzene condensation and cooling equipment according to claim 1, characterized in that: The shell and tube heat exchanger is a fixed tube sheet heat exchanger, a U-tube heat exchanger or a floating head heat exchanger.

10. The crude benzene condensation and cooling equipment according to claim 9, characterized in that: The fixed tube sheet heat exchanger comprises a first tube box, an intermediate tube box and a second tube box which are connected in sequence; The low-temperature water inlet and the discharge port are fixedly connected to the first pipe box; The tube bundle is arranged in the middle tube box, the support, the crude benzene outlet and the first vent are fixedly connected to the bottom of the middle tube box, and the L-shaped interface is connected to the crude benzene outlet; The low-temperature water outlet and the second vent are fixedly connected to the second pipe box.

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