Solid caustic soda tower of propylene refining system

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a solid caustic soda tower of a propylene refining system. The solid caustic soda tower of the propylene refining system comprises a solid caustic soda tower body, a spraying pipe is arranged in the solid caustic soda tower body, a spraying head is arranged on the spraying pipe, a packing device is arranged in the solid caustic soda tower body, the packing device comprises a rotating shaft and a packing main body, and the rotating shaft and the packing main body are fixedly connected together. The rotating shaft is movably connected with the solid caustic soda tower body, a pin hole is formed in the rotating shaft, the filler main body is of a hollow cylindrical structure, a partition plate is arranged in the filler main body, a cover body is arranged on the filler main body, and a plurality of air holes are formed in the cover body. And the diameter of the outer circle of the filler main body corresponds to the inner diameter of the solid caustic soda tower body. According to the solid caustic soda tower of the propylene refining system provided by the utility model, the spray structure and the movable filling device are arranged, so that the structure is convenient to clean, and the problem of blockage caused by caking in the solid caustic soda tower is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a solid alkali tower in a propylene refining system. Background Art

[0002] Propylene is one of the three basic raw materials for synthetic materials. The largest amount of it is used in the production of polypropylene. Propylene can be used to produce acrylonitrile, propylene oxide, isopropanol, phenol, acetone, butanol, octanol, acrylic acid and its esters, propylene glycol, epichlorohydrin and synthetic glycerin.

[0003] The crude propylene contains impurities such as water and sulfur, which have a great impact on subsequent production. The solid alkali tower is an important component of propylene refining equipment. It can not only remove water from propylene, but also remove some sulfur, carbon dioxide and other impurities in propylene. Due to the low water content in propylene, the impurities absorbed by the solid alkali cannot be removed in time, causing the solid alkali tower to fail, the sulfur content to increase, or the subsequent equipment of the propylene refining system to fail.

[0004] The patent CN203683416U proposes a water injection device for a solid alkali tower in a propylene refining system, which is provided with a system feed switching system and a water injection pump. The system feed switching system is provided with a side feed pipe and a bottom feed pipe. The side feed pipe is connected to the side of the solid alkali tower, the bottom feed pipe is connected to the bottom of the solid alkali tower, and the water injection pump is connected to the bottom feed pipe. The water injection device for the solid alkali tower in the propylene refining system solves the above problems to a certain extent. The main function of the solid alkali tower in the propylene refining system is to remove impurities such as sulfur, carbon dioxide and part of water in propylene, but the following problems still exist in the actual production of the above device: impurities are adsorbed on the surface of the solid alkali, which reduces the contact area between the solid alkali and propylene, reduces the removal efficiency of the solid alkali tower, increases the sulfur content in propylene, and causes poisoning of the subsequent system catalyst; or blocks the propylene flow channel in the solid alkali tower, causing the pressure difference of the solid alkali tower to increase, and it cannot operate normally, and the solid alkali must be stopped and replaced. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned defects in the prior art and provide a solid alkali tower for a propylene refining system. By providing a spray structure and a movable filler device, the cleaning of the structure is facilitated and the blockage problem caused by agglomeration inside the solid alkali tower is avoided.

[0006] The solid alkali tower of the propylene refining system described in the utility model comprises a solid alkali tower body, a spray pipe is arranged inside the solid alkali tower body, a spray head is arranged on the spray pipe, a packing device is arranged inside the solid alkali tower body, the packing device comprises a rotating shaft and a packing body, the rotating shaft and the packing body are fixedly connected together, the rotating shaft is movably connected to the solid alkali tower body, a pin hole is arranged on the rotating shaft, the packing body is a hollow cylindrical structure, a partition is arranged inside the packing body, one end of the packing body is integrally formed with the cover body, and the other end is provided with another cover body by a detachable connection method, and a plurality of air holes are arranged on the cover body. The diameter of the outer circle of the packing body is set corresponding to the inner diameter of the solid alkali tower body. The packing body is arranged inside the solid alkali tower body and is turned up and down by the rotating shaft. For the movable connection between the rotating shaft and the solid alkali tower body, those skilled in the art can connect and process it by means of a movable bearing to avoid leakage problems. Of course, it can also be processed by other existing technologies such as plugging, so it is not further limited. One end of the filler body is integrally formed with the cover body. After filling, the cover body at the other end is covered, and the other end can be fixed firmly by means of a buckle or a clamp.

[0007] Preferably, the top gas outlet of the solid alkali tower body is connected to the acrylonitrile refining system.

[0008] Preferably, baffle plate 1 and baffle plate 2 are provided on the outer wall of the solid alkali tower body at positions corresponding to the rotating shaft, and the baffle plates correspond to each other up and down.

[0009] Preferably, the baffle plate 1 and the baffle plate 2 are in corresponding positions and fixed by a latch block. When the rotating shaft is rotated to correspond to the holes on the baffle plate 1 and the baffle plate 2, latch fixation can be achieved.

[0010] Preferably, a liquid propylene feed pipe is provided at the lower part of the solid alkali tower body.

[0011] Preferably, a drain valve is provided at the bottom of the solid alkali tower body, and the bottom of the solid alkali tower body is connected to the sewage system.

[0012] Preferably, a plurality of groups of spray pipes and spray heads are arranged inside the solid alkali tower body, the spray pipes are connected to the desalted water pipes, and the desalted water pipes are provided with a water injection pump and a spray valve.

[0013] Preferably, a plurality of packing devices are arranged inside the solid alkali tower body.

[0014] Preferably, the partition separates the interior of the filler body into a plurality of filler bins, and the interior of the filler bins is filled with / - / volumes of filler.

[0015] Preferably, a handle is provided at the end of the rotating shaft, and the handle can be driven manually or further electrically.

[0016] The solid alkali tower of the propylene refining system described in the utility model is equipped with a multi-layer spray pipe in the solid alkali tower body, and the spray heads are evenly distributed in the solid alkali tower. The water injection pump is used to regularly add water into the tower to wash the impurities on the surface of the solid alkali, so as to realize the stable and long-term operation of the solid alkali tower. Water and propylene flow from top to bottom under the effect of density difference, and the waste alkali liquid with impurities is gathered at the bottom of the tower, and finally discharged through the bottom drain valve of the solid alkali tower body and sent to the sewage system for treatment; when cleaning, the packing device in the solid alkali tower body is turned over by the rotating shaft, and the packing of the packing bin is in a half-filled state, which will rotate with multiple turns to remove the precipitated solid alkali, and can also be flushed with spray water to achieve the purpose of efficient and rapid treatment.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] (1) Compared with the conventional solid alkali tower, the solid alkali tower of the propylene refining system of the utility model has a multi-layer spray device inside to achieve the effect of efficient spray cleaning.

[0019] (2) Compared with the traditional solid alkali tower, the solid alkali tower of the propylene refining system of the utility model has an additional reversible packing device inside, which drives the packing to move and efficiently remove the solid alkali to prevent the negative impact caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the solid alkali tower of the propylene refining system of the utility model.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the filling device.

[0022] Figure 3 It is a schematic diagram of the planar structure of the packing device.

[0023] In the figure: 1. Soda tower body; 2. Spray pipe; 3. Spray head; 4. Spray valve; 5. Desalted water pipe; 6. Water injection pump; 7. Filling device; 8. Baffle 1; 9. Baffle 2; 10. Latch block; 11. Acrylonitrile refining system; 12. Liquid propylene feed pipe; 13. Drain valve; 14. Sewage system;

[0024] 71. Rotating shaft; 72. Filling body; 73. Partition plate; 74. Filling bin; 75. Cover body; 76. Air vent; 77. Handle; 78. Pin hole. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with specific embodiments.

[0026] like Figure 1As shown, the propylene refining system solid alkali tower comprises a solid alkali tower body 1, a spray pipe 2 is arranged inside the solid alkali tower body 1, a spray head 3 is arranged on the spray pipe 2, and a packing device 7 is arranged inside the solid alkali tower body 1. Figure 2 As shown, the packing device 7 includes a rotating shaft 71 and a packing body 72, the rotating shaft 71 and the packing body 72 are fixedly connected together, the rotating shaft 71 is movably connected to the solid alkali tower body 1, a pin hole 78 is provided on the rotating shaft 71, the packing body 72 is a hollow cylindrical structure, and a partition 73 is provided inside the packing body 72, as shown in FIG. Figure 3 As shown, one end of the packing body 72 is integrally formed with the cover body 75, and the other end is provided with another cover body 75 by a detachable connection method, and a plurality of air holes 76 are provided on the cover body 75. The diameter of the outer circle of the packing body 72 is set corresponding to the inner diameter of the solid alkali tower body 1. The packing body 72 is arranged inside the solid alkali tower body 1 and is turned up and down by the rotating shaft 71. For the movable connection between the rotating shaft 71 and the solid alkali tower body 1, those skilled in the art can connect and process it by means of a movable bearing to avoid leakage problems. Of course, it can also be processed by other existing technologies such as plugging, so it is not further limited. One end of the packing body 72 is integrally formed with the cover body 75. After packing, the cover body 75 at the other end is covered, and the other end can be fixed and covered by means of a buckle or a clamp.

[0027] The tower top gas outlet of the solid alkali tower body 1 is connected to the acrylonitrile refining system 11 .

[0028] A baffle plate 1 8 and a baffle plate 2 9 are arranged on the outer wall of the solid alkali tower body 1 at a position corresponding to the rotating shaft 71 .

[0029] The positions of baffle plate 1 8 and baffle plate 2 9 correspond to each other and are fixed by latch block 10. When the rotating shaft 71 rotates to correspond to the holes on baffle plate 1 8 and baffle plate 2 9, latch fixing can be achieved.

[0030] A liquid propylene feed pipe 12 is provided at the lower part of the solid alkali tower body 1 .

[0031] A drain valve 13 is provided at the bottom of the solid alkali tower body 1 , and the bottom of the solid alkali tower body 1 is connected to a sewage system 14 .

[0032] A plurality of spray pipes 2 and spray heads 3 are arranged inside the solid alkali tower body 1 . The spray pipes 2 are connected to the desalted water pipe 5 . The desalted water pipe 5 is provided with a water injection pump 6 and a spray valve 4 .

[0033] A plurality of packing devices 7 are arranged inside the solid alkali tower body 1 .

[0034] The partition 73 separates the interior of the filler body 72 into a plurality of filler bins 74 , and the interior of the filler bins 74 is filled with 1 / 2 to 2 / 3 of the volume of the filler.

[0035] A handle 77 is provided at the end of the rotating shaft 71, and the handle 77 can be driven manually or electrically.

[0036] The solid alkali tower of the propylene refining system described in the utility model is equipped with a multi-layer spray pipe 2 in the solid alkali tower body 1, and the spray heads 3 are evenly distributed in the solid alkali tower. The water injection pump 6 is used to regularly add water into the tower to wash the impurities on the surface of the solid alkali, so as to realize the stable and long-term operation of the solid alkali tower. Water and propylene flow from top to bottom under the effect of density difference, and the waste alkali liquid with impurities is gathered at the bottom of the tower, and finally discharged through the bottom drain valve 13 of the solid alkali tower body 1 and sent to the sewage system 14 for treatment; when cleaning, the packing device 7 in the solid alkali tower body 1 is turned over by the rotating shaft 71, and the packing of the packing bin 74 is in a half-filled state, which will rotate with multiple turns to remove the precipitated solid alkali, and can also be flushed with spray water to achieve the purpose of efficient and rapid treatment.

[0037] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and any equivalent changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention shall fall within the scope of the patent coverage of the present invention.

Claims

1. A solid alkali tower for a propylene refining system, characterized in that: The invention comprises a solid alkali tower body (1), a spray pipe (2) is arranged inside the solid alkali tower body (1), a spray head (3) is arranged on the spray pipe (2), a packing device (7) is arranged inside the solid alkali tower body (1), the packing device (7) comprises a rotating shaft (71) and a packing body (72), the rotating shaft (71) and the packing body (72) are fixedly connected together, the rotating shaft (71) is movably connected to the solid alkali tower body (1), a pin hole (78) is arranged on the rotating shaft (71), the packing body (72) is a hollow cylindrical structure, a partition (73) is arranged inside the packing body (72), one end of the packing body (72) is integrally formed with a cover body (75), and the other end is provided with another cover body (75) in a detachable connection manner, and a plurality of air holes (76) are arranged on the cover body (75).

2. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: The tower top gas outlet of the solid alkali tower body (1) is connected to the acrylonitrile refining system (11).

3. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: A baffle plate 1 (8) and a baffle plate 2 (9) are arranged on the outer wall of the solid alkali tower body (1) at positions corresponding to the rotating shaft (71) and corresponding to each other up and down.

4. The solid alkali tower of the propylene refining system according to claim 3, characterized in that: The positions of baffle plate 1 (8) and baffle plate 2 (9) correspond to each other and are fixed by a latch block (10).

5. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: A liquid propylene feed pipe (12) is arranged at the lower part of the solid alkali tower body (1).

6. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: A drain valve (13) is provided at the bottom of the solid alkali tower body (1), and the bottom of the solid alkali tower body (1) is connected to a sewage system (14).

7. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: A plurality of spray pipes (2) and spray heads (3) are arranged inside the solid alkali tower body (1); the spray pipes (2) are connected to a desalted water pipe (5); and a water injection pump (6) and a spray valve (4) are arranged on the desalted water pipe (5).

8. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: A plurality of groups of filling devices (7) are arranged inside the solid alkali tower body (1).

9. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: The partition (73) separates the interior of the filler body (72) into a plurality of filler bins (74), and the interior of the filler bins (74) is filled with 1 / 2 to 2 / 3 of the volume of the filler.

10. The solid alkali tower of the propylene refining system according to claim 1, characterized in that: A handle (77) is provided at the end of the rotating shaft (71).

Images