CO2 stripping urea device

Abstract

The utility model discloses a urea device adopting a CO2 stripping method. The urea device comprises a stripping tower, a liquid outlet pipe, a gas inlet pipe, a valve, a gas distributor, a mounting plate, a filtering device, a liquid inlet pipe, a second valve, a liquid distributor, a gas pump and a gas outlet pipe. The filtering device is additionally arranged at the right end of the liquid inlet pipe, input reaction liquid is filtered, it is avoided that impurities are contained in the reaction liquid, and the urea extraction quality and efficiency are affected, and due to the arrangement of the adjusting pipe, the adjusting pipe can move leftwards in a spiral mode and is greatly embedded into the connecting pipe, the adjusting pipe is separated from the discharging pipe, and the urea extraction efficiency is improved. According to the filtering piece, the assembly body can be conveniently flushed, internal residual impurities are flushed out and cleaned, the filtering effect is improved through secondary filtering of the reaction liquid, the situation that the throughput of the reaction liquid is reduced due to excessive accumulation of the impurities is effectively avoided, the filtering piece is convenient to mount and dismount, the filtering piece is conveniently separated from the filtering plate, and the filtering efficiency is improved. The cleaning convenience and the cleaning efficiency of the filtering piece and the filtering plate are improved.

Description

Technical Field

[0001] The utility model relates to the field related to urea production, in particular to a CO2 stripping urea device. Background Art

[0002] At present, TEC's ACES process is generally used in urea production. The CO2 stripping tower is the key equipment in these process units. The equipment consists of three tower plates on the upper part and a falling film heater on the lower part. The function of the tower plate is to adiabatically strip the synthetic liquid with the CO2 enriched gas rising from the tubes, and to strip out the excess ammonia in the synthetic liquid to make it close to the optimal feed composition, so as to achieve effective CO2 stripping effect.

[0003] The Chinese patent with patent number CN202321251746.0 discloses the "Melamine Co-production of Urea CO2 Stripping Tower". By designing a movable rod to connect conical block one and conical block two, the inlet sizes of the liquid inlet pipe and the air inlet pipe can be adjusted synchronously, thereby increasing the displacement of carbon dioxide and liquid synchronously, thereby ensuring that the liquid fully completes the stripping reaction, and designing conical block two to relieve the pressure generated by the high load on the liquid inlet pipe by expanding the inlet, thereby ensuring stable transportation of the liquid inlet pipe.

[0004] This structure has certain advantages, but still has some shortcomings:

[0005] During the use of the stripping tower, the reaction liquid is contacted with CO2 to react, urea in the reaction liquid is extracted, and it is discharged from the top of the tower along with the CO2. During the input process of the reaction liquid, the reaction liquid may contain impurities, such as metal ions such as iron and copper and other organic matter, which can easily affect the quality and stability of the urea liquid in the reaction liquid, and is not conducive to the extraction quality and efficiency of urea in the reaction liquid. Utility Model Content

[0006] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a CO2 stripping urea device.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a CO2 stripping urea device, including a stripping tower, a liquid outlet pipe, an air inlet pipe, a valve, a gas distributor, a mounting plate, a filtering device, a liquid inlet pipe, a second valve, a liquid distributor, an air pump, and an air outlet pipe. The bottom end of the stripping tower is provided with a liquid outlet pipe, the left end of the air inlet pipe is connected to the gas distributor, and a valve is installed in the middle thereof, the gas distributor is installed at the inner bottom end of the stripping tower, the left end of the mounting plate is locked and fixed to the stripping tower, the left end of the liquid inlet pipe is connected to the liquid distributor, and a second valve is installed in the middle thereof, the liquid distributor is installed at the inner top end of the stripping tower, the air pump is installed at the top end of the stripping tower, and its bottom end is connected to the inner part of the stripping tower, the gas An air outlet pipe is provided at the right end of the pump, the filter device is installed at the top of the mounting plate, and its left end is connected with the liquid inlet pipe. The filter device comprises an assembly, a feed pipe, a discharge pipe, an adjusting pipe, a connecting pipe, a top cover, a filter plate, a guide plate, and a filter element. The bottom end of the assembly is locked and fixed to the mounting plate, and the discharge pipe and the feed pipe are fixed to its left and right ends respectively. The inner side of the right end of the adjusting pipe is threadedly connected to the discharge pipe, and the inner side of the left end is threadedly connected to the connecting pipe. The left end of the connecting pipe is connected with the liquid inlet pipe, and the top cover is embedded downwardly into the assembly, and a filter plate is fixed at the bottom end of the top cover, and the bottom end of the filter plate is fixed to the guide plate, and the bottom end of the guide plate is in contact with the assembly, and the upper and lower ends of the filter element are respectively embedded in the inner sides of the top cover and the filter plate.

[0008] As a further solution of the utility model, the filter element includes a support frame, a connecting spring, an upper filter screen, a lower filter screen, a positioning hole, and a positioning frame. Connecting springs are installed at both upper and lower ends of the support frame. The bottom end of the upper filter screen and the upper end of the lower filter screen are elastically connected to the support frame by connecting springs, and the positioning frame is embedded in the positioning hole to the left.

[0009] As a further solution of the utility model, positioning holes are provided at the right ends of the support frame, the upper filter screen and the lower filter screen, and a rubber ring is sleeved inside the positioning hole to stabilize the positioning frame inside, thereby playing a role in stabilizing the connection and facilitating the positioning frame to lock the placement of the upper filter screen and the lower filter screen, thereby facilitating the installation of the filter element at the bottom end of the top cover.

[0010] As a further solution of the utility model, the cross section of the support frame is in the shape of an "I" character, which is convenient for supporting the movement of the upper filter screen and the lower filter screen.

[0011] As a further solution of the utility model, the left end of the guide plate is tilted downward to facilitate guiding the input liquid so that the reaction liquid remaining at the bottom can slide downward to avoid a small amount of reaction liquid accumulating inside the assembly.

[0012] As a further solution of the utility model, the top middle part of the filter plate and the middle bottom part of the top cover are both provided with mounting grooves for mounting the filter element, so that the filter element can be stably mounted and play a stable filtering role.

[0013] As a further solution of the utility model, the upper filter screen and the lower filter screen are consistent in size.

[0014] As a further solution of the utility model, the filter plate, the upper filter screen and the lower filter screen are all made of stainless steel, which has high strength, corrosion resistance, strong practicality, and is convenient for use in reaction liquid containing urea solution.

[0015] As a further solution of the utility model, the connecting spring is made of alloy spring steel, has excellent elastic restoring force and supporting force, and is not easy to be damaged.

[0016] Compared with the prior art, the utility model provides a CO2 stripping urea device having the following features:

[0017] Beneficial effects:

[0018] 1. In the utility model, a filtering device is added to the right end of the liquid inlet pipe to filter the input reaction liquid to avoid impurities in the reaction liquid, which affects the quality and efficiency of urea extraction. In addition, the adjusting pipe is arranged so that the adjusting pipe can be spirally moved to the left and largely embedded in the interior of the connecting pipe, so that the adjusting pipe is separated from the discharge pipe, which is convenient for flushing the assembly, flushing out and cleaning the impurities remaining inside, and the flushed sewage can be directly discharged to avoid input into the liquid inlet pipe, thereby improving the convenience and flexibility of cleaning the assembly.

[0019] 2. In the utility model, a filter element is provided in combination with a filter plate to achieve secondary filtration of the reaction liquid, thereby improving the filtering effect and effectively avoiding the situation where the amount of reaction liquid passing through is reduced due to excessive accumulation of impurities. The filter element is easy to install and disassemble. By removing the positioning frame, the upper filter screen and the lower filter screen are compressed inwardly, and the overall height of the filter element is reduced, the filter element can be disassembled and taken out, which is convenient for separating the filter element from the filter plate, thereby improving the cleaning convenience and cleaning efficiency of the filter element and the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the filter device of the utility model;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the filter device of the utility model;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the filter element of the utility model;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the filter element of the utility model.

[0026] Among them: stripping tower-1, liquid outlet pipe-2, air inlet pipe-3, valve-4, gas distributor-5, mounting plate-6, filter device-7, liquid inlet pipe-8, second valve-9, liquid distributor-10, air pump-11, air outlet pipe-12, assembly-71, feed pipe-72, discharge pipe-73, regulating pipe-74, connecting pipe-75, top cover-76, filter plate-77, guide plate-78, filter element-79, support frame-791, connecting spring-792, upper filter screen-793, lower filter screen-794, positioning hole-795, positioning frame-796. DETAILED DESCRIPTION

[0027] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0028] See also Figure 1-2 In the present utility model embodiment:

[0029] A CO2 stripping urea device comprises a stripping tower 1, a liquid outlet pipe 2, an air inlet pipe 3, a valve 4, a gas distributor 5, a mounting plate 6, a liquid inlet pipe 8, a second valve 9, a liquid distributor 10, an air pump 11, and an air outlet pipe 12. The bottom end of the stripping tower 1 is provided with the liquid outlet pipe 2, the left end of the air inlet pipe 3 is connected with the gas distributor 5, and the valve 4 is installed in the middle thereof, the gas distributor 5 is installed at the inner bottom end of the stripping tower 1, the left end of the mounting plate 6 is locked and fixed with the stripping tower 1, the left end of the liquid inlet pipe 8 is connected with the liquid distributor 10, and the second valve 9 is installed in the middle thereof, the liquid distributor 10 is installed at the inner top end of the stripping tower 1, the air pump 11 is installed at the top end of the stripping tower 1, and its bottom end is connected with the inside of the stripping tower 1, and the air outlet pipe 12 is provided at the right end of the air pump 11.

[0030] refer to Figure 3-4 , in the embodiment of the utility model:

[0031] The filter device 7 is installed on the top of the mounting plate 6, and its left end is connected with the liquid inlet pipe 8. The filter device 7 includes an assembly 71, a feed pipe 72, a discharge pipe 73, an adjusting pipe 74, a connecting pipe 75, a top cover 76, a filter plate 77, a guide plate 78, and a filter element 79. The bottom end of the assembly 71 is locked and fixed to the mounting plate 6, and the discharge pipe 73 and the feed pipe 72 are fixed to the left and right ends thereof respectively. The inner side of the right end of the adjusting pipe 74 is threadedly connected to the discharge pipe 73, and the inner side of the left end is threadedly connected to the connecting pipe 75. The left end of the connecting pipe 75 is connected with the liquid inlet pipe 8. The top cover 76 is embedded downwardly in the assembly 71. The bottom end of the top cover 76 is fixed with a filter plate 77. The bottom end of the filter plate 77 is fixed to the guide plate 78. The bottom end of the guide plate 78 is fixed to the assembly 71. The upper and lower ends of the filter element 79 are respectively embedded in the inner sides of the top cover 76 and the filter plate 77. The left end of the guide plate 78 is tilted downward to facilitate guiding the input liquid so that the residual reaction liquid at the bottom can slide down to avoid a small amount of reaction liquid accumulating inside the assembly 71. The top of the middle part of the filter plate 77 and the middle of the bottom end of the top cover 76 are both provided with mounting grooves for installing the filter element 79 so that the filter element 79 can be stably installed to play a stable filtering role. The filter plate 77, the upper filter screen 793, and the lower filter screen 794 are all made of stainless steel, which has high strength, corrosion resistance, and strong practicality, and is convenient for use in reaction liquids containing urea liquid. A sealing ring is provided at the connection between the assembly 71 and the top cover 76 to strengthen the connection and sealing.

[0032] refer to Figure 5-6 , in the embodiment of the utility model:

[0033] The filter element 79 includes a support frame 791, a connecting spring 792, an upper filter screen 793, a lower filter screen 794, a positioning hole 795, and a positioning frame 796. The upper and lower ends of the support frame 791 are both installed with connecting springs 792. The bottom end of the upper filter screen 793 and the upper end of the lower filter screen 794 are elastically connected to the support frame 791 by connecting springs 792. The positioning frame 796 is embedded in the positioning hole 795 to the left. The right ends of the support frame 791, the upper filter screen 793 and the lower filter screen 794 are all provided with positioning holes 795, and the interior of the positioning holes 795 is sleeved with rubber rings. It is convenient to stabilize the positioning frame 796 inside to play a role in stabilizing the connection, and it is convenient for the positioning frame 796 to lock the placement of the upper filter 793 and the lower filter 794, so as to facilitate the installation of the filter element 79 on the bottom end of the top cover 76. The cross-section of the support frame 791 is in the shape of an "I", which is convenient for supporting the activities of the upper filter 793 and the lower filter 794, and the function of comprehensively filtering the input reaction liquid. The upper filter 793 and the lower filter 794 are consistent in size. The connecting spring 792 is made of alloy spring steel, which has excellent elastic recovery and supporting force and is not easy to be damaged.

[0034] Magnetic blocks may be installed in partial areas of the upper filter screen 793 and the lower filter screen 794, and the magnetic blocks may be used to adsorb metal impurities, thereby improving the efficient removal of metal impurities.

[0035] refer to Figure 1-Figure 6 When in use, the reaction liquid is fed from the feed pipe 72 into the interior of the assembly 71, and filtered by the upper filter screen 793, the lower filter screen 794 and the filter plate 77 to filter the impurities in the reaction liquid. After filtering, the reaction liquid is output from the discharge pipe 73, and fed into the liquid inlet pipe 8 through the regulating pipe 74 and the connecting pipe 75. Finally, the reaction liquid forms a water curtain inside the stripping tower 1 through the action of the liquid distributor 10;

[0036] At the same time, CO2 gas is input from the air inlet pipe 3 and sprayed upward through the action of the gas distributor 5. When the CO2 gas countercurrently contacts the reaction liquid containing urea sprayed down, the CO2 gas reacts with the urea in the reaction liquid to produce ammonium carbamate, so that urea is released from the reaction liquid and discharged from the air outlet pipe 12 at the top of the tower along with the CO2 gas. The gas can be quickly discharged under the action of the air pump 11. The gas mixture (mainly CO2 gas and urea) discharged from the top of the tower can be further processed to recover urea, while the liquid outlet pipe 2 discharges less urea and reaction liquid.

[0037] Among them, the amount of reaction liquid and CO2 gas can be controlled by adjusting the valve 4 and the second valve 9, thereby controlling the load and pressure inside the stripping tower 1;

[0038] When it is necessary to clean the filter plate 77 and the filter element 79, pull up the top cover 76, take out the filter plate 77 and the filter element 79, then pull out the positioning frame 796, and squeeze the upper filter screen 793 and the lower filter screen 794 to shorten the overall height of the filter element 79, thereby removing the filter element 79 from the side of the filter plate 77, making it easier to disassemble and rinse the filter element 79 and the filter plate 77, thereby increasing the speed of impurity removal. In addition, when it is necessary to rinse the assembly 71, by rotating the adjusting tube 74 to the left, the adjusting tube 74 is largely embedded in the interior of the connecting tube 75, thereby separating the adjusting tube 74 from the discharge tube 73 and no longer connecting them, the assembly 71 can be rinsed to rinse out the impurities retained inside.

[0039] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

[0040] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0041] The above description is only a preferred example of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A CO2 stripping urea device, comprising a stripping tower (1), a liquid outlet pipe (2), an air inlet pipe (3), a valve (4), a gas distributor (5), a mounting plate (6), a liquid inlet pipe (8), a second valve (9), a liquid distributor (10), an air pump (11), and an air outlet pipe (12), wherein the bottom end of the stripping tower (1) is provided with a liquid outlet pipe (2); Features: The invention also comprises a filter device (7), wherein the filter device (7) is mounted on the top of the mounting plate (6), and the left end of the filter device (7) is connected to the liquid inlet pipe (8). The filter device (7) comprises an assembly (71), a feed pipe (72), a discharge pipe (73), an adjustment pipe (74), a connecting pipe (75), a top cover (76), a filter plate (77), a guide plate (78), and a filter element (79). The bottom end of the assembly (71) is locked and fixed to the mounting plate (6), and the discharge pipe (73) and the feed pipe (72) are fixed to the left and right ends of the assembly (71), respectively. The adjustment pipe (71) is connected to the mounting plate (6), and the discharge pipe (73) and the feed pipe (72) are fixed to the left and right ends of the assembly (71). The inner side of the right end of the assembly (71) is threadedly connected to the discharge pipe (73), and the inner side of the left end of the assembly (71) is threadedly connected to the connection pipe (75). The left end of the connection pipe (75) is connected to the liquid inlet pipe (8). The top cover (76) is embedded downward into the assembly (71). A filter plate (77) is fixed to the bottom end of the top cover (76). The bottom end of the filter plate (77) is fixed to the guide plate (78). The bottom end of the guide plate (78) is in contact with the assembly (71). The upper and lower ends of the filter element (79) are respectively embedded in the inner sides of the top cover (76) and the filter plate (77).

2. A CO2 stripping urea device according to claim 1, characterized in that: The filter element (79) comprises a support frame (791), a connecting spring (792), an upper filter screen (793), a lower filter screen (794), a positioning hole (795), and a positioning frame (796). The support frame (791) is provided with connecting springs (792) at both upper and lower ends. The bottom end of the upper filter screen (793) and the upper end of the lower filter screen (794) are elastically connected to the support frame (791) by connecting springs (792), and the positioning frame (796) is embedded in the positioning hole (795) to the left.

3. A CO2 stripping urea device according to claim 1, characterized in that: The left end of the air inlet pipe (3) is connected to the gas distributor (5), and a valve (4) is installed in the middle thereof. The gas distributor (5) is installed at the inner bottom end of the stripping tower (1). The left end of the mounting plate (6) is locked and fixed to the stripping tower (1). The left end of the liquid inlet pipe (8) is connected to the liquid distributor (10), and a second valve (9) is installed in the middle thereof. The liquid distributor (10) is installed at the inner top end of the stripping tower (1). The air pump (11) is installed at the top end of the stripping tower (1), and its bottom end is connected to the interior of the stripping tower (1). The right end of the air pump (11) is provided with an air outlet pipe (12).

4. A CO2 stripping urea device according to claim 2, characterized in that: The right ends of the support frame (791), the upper filter screen (793) and the lower filter screen (794) are all provided with positioning holes (795), and the interior of the positioning holes (795) is sleeved with a rubber ring.

5. A CO2 stripping urea device according to claim 2, characterized in that: The cross section of the support frame (791) is in the shape of an I.

6. A CO2 stripping urea device according to claim 1, characterized in that: The left end of the guide plate (78) is inclined downward.

7. A CO2 stripping urea plant according to claim 1, characterized in that: The top middle portion of the filter plate (77) and the middle bottom portion of the top cover (76) are both provided with mounting grooves for mounting the filter element (79).

8. A CO2 stripping urea plant according to claim 2, characterized in that: The upper filter screen (793) and the lower filter screen (794) are of the same size.

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