Ammonia gas washing and recycling device for cyclohexylamine production
Through the combined device of evaporator and heat exchanger, the problem of low ammonia absorption efficiency in cyclohexylamine production is solved, efficient ammonia absorption and cost reduction are achieved, and the cyclohexylamine production process is optimized.
Patent Information
- Application Number
- CN202422190007.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-06
AI Technical Summary
During the existing cyclohexylamine production process, the high concentration of the scrubber ammonia water circulating absorption efficiency is low, resulting in high ammonia gas concentration, increasing the amount of desalinated water on the top of the tower increases the system resistance and ammonia water inventory pressure, affecting production efficiency and cost.
The combination device of the evaporator and heat exchanger is used to collect low-concentration ammonia water through the evaporator to circulate and absorb, forming an efficient absorption device with the ammonia water concentration gradually increasing from the top to the bottom. The low-concentration ammonia water refluxes multiple times to absorb high-concentration ammonia water, reduce the amount of desalinated water, and improve the absorption efficiency.
It improves the ammonia absorption efficiency, reduces the amount of desalinated water, reduces system resistance and ammonia inventory pressure, and reduces production costs.
Smart Images
Figure CN223144443U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of ammonia washing, and particularly relates to an ammonia washing and recycling device for cyclohexylamine production. Background Art
[0002] During the production of ammonia for washing in cyclohexylamine production, in the existing washing tower during production, the high-concentration ammonia water at the bottom of the washing tower is returned to the middle and top of the tower through a reflux pump for cyclic absorption. The high ammonia water concentration at the top will affect the ammonia absorption rate of the tower equipment; when the ammonia water concentration at the bottom of the tower reaches more than 10%, the ammonia concentration in the cyclic gas is still very high, and the ammonia absorption efficiency of the washing tower is low. To reduce the ammonia concentration in the cyclic gas, only the dosage of desalted water at the top of the tower can be increased. However, too much water absorption at the top of the tower will not only increase the water volume of the packing in the tower, resulting in an increase in system resistance, but also lead to an increase in the amount of absorbed ammonia water. The excessive dilution of ammonia water will increase the pressure on the sales of 18% ammonia water for downstream carbonization, and often lead to a high ammonia water inventory, affecting the normal production of the cyclohexylamine device. Content of the Utility Model
[0003] In view of the problems in the prior art, the utility model proposes the following technical solutions:
[0004] The utility model provides an ammonia washing and recycling device for cyclohexylamine production, including:
[0005] A washing tower, the washing tower includes an air inlet end provided at the bottom end and a spraying section provided in the upper section inside the washing tower;
[0006] A liquid accumulator, the liquid accumulator is arranged in the middle section inside the washing tower, the liquid accumulator includes a liquid accumulation plate and a plurality of air holes opened on the liquid accumulation plate, and a riser cap communicated with each air hole is correspondingly arranged at each air hole.
[0007] Preferably, as the above technical solution, it further includes an ammonia water circulation tank and a circulation pump which are sequentially connected to the liquid accumulator. The ammonia water circulation tank is communicated with the liquid accumulator, and the ammonia water in the liquid accumulator is output to the ammonia water circulation tank.
[0008] Preferably, as the above technical solution, it further includes a heat exchanger, the heat exchanger is arranged in the rear section of the circulation pump, and the output end of the heat exchanger is communicated to the spraying section of the washing tower.
[0009] Preferably, as the above technical solution, the liquid accumulation plate is spliced by a plurality of stainless steel plates, and eight riser caps are provided.
[0010] The beneficial effects of the utility model are as follows:
[0011] The utility model forms an efficient absorption device with the ammonia water concentration gradually increasing from the top to the bottom of the whole scrubbing tower by setting a liquid accumulator, which returns part of the low-concentration ammonia water sprayed from the spraying section of the scrubbing tower to the spraying section to continue absorbing ammonia in the recycle gas, and the other part continues to absorb the high-concentration ammonia water at the bottom of the tower. The high-concentration ammonia water is discharged and sent to carbonization, and the low-concentration ammonia water is recycled and absorbed multiple times, thereby ensuring the absorption efficiency and reducing the absorption cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 FIG. shows the structural schematic diagram of the ammonia gas scrubbing and recovery device in the embodiment;
[0013] Figure 2 FIG. shows the structural schematic diagram of the liquid accumulator in the embodiment;
[0014] Reference numerals: 10, scrubbing tower; 11, air inlet end; 12, spraying section; 20, liquid accumulator; 21, liquid accumulation plate; 22, air holes; 23, gas lift cap; 31, ammonia water circulation tank; 32, circulation pump; 33, heat exchanger. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments.
[0016] Embodiment
[0017] As Figure 1 , Figure 2 shown, Figure 1 FIG. shows the structural schematic diagram of the ammonia gas scrubbing and recovery device in the embodiment; Figure 2 FIG. shows the structural schematic diagram of the liquid accumulator in the embodiment;
[0018] This device includes:
[0019] A scrubbing tower 10, which includes an air inlet end 11 provided at the bottom end and a spraying section 12 provided in the upper section inside the scrubbing tower 10;
[0020] A liquid accumulator 20, which is arranged in the middle section inside the scrubbing tower 10. The liquid accumulator 20 includes a liquid accumulation plate 21 and a plurality of air holes 22 opened on the liquid accumulation plate 21. A gas lift cap 23 communicated with each air hole 22 is correspondingly arranged at each air hole 22.
[0021] Specifically, a DN500 manhole is opened on the scrubbing tower 10. The liquid accumulator 20 is introduced from the manhole and installed in the middle section inside the scrubbing tower 10. The liquid accumulation plate 21 is spliced by multiple stainless steel plates. The air holes 22 and the gas lift caps 23 play a role in ensuring the normal circulation of gas in the scrubbing tower 10. Eight gas lift caps 23 are provided;
[0022] Through the liquid accumulator 20 arranged in the middle section inside the scrubbing tower 10, the low-concentration ammonia water sprayed from the spraying section 12 can be collected and circulated to the spraying section 12 of the scrubbing tower 10, enabling the newly replenished desalted water to absorb ammonia gas multiple times. This not only reduces the consumption of desalted water but also improves the ammonia gas absorption rate.
[0023] A part of the low-concentration ammonia water sprayed from the spraying section 12 of the scrubbing tower 10 is refluxed to the spraying section 12 through the arranged liquid accumulator 20 to continue absorbing ammonia gas in the circulating gas, and the other part continues to absorb the high-concentration ammonia water at the bottom of the tower, making the entire scrubbing tower 10 form an efficient absorption device with the ammonia water concentration gradually increasing from the top to the bottom. The high-concentration ammonia water is discharged for carbonization, and the low-concentration ammonia water is refluxed and absorbed multiple times, thereby ensuring the absorption efficiency and reducing the absorption cost.
[0024] As Figure 1 、 Figure 2 shown, Figure 1 Figure 1 shows the structural schematic diagram of the ammonia gas scrubbing and recovery device in the embodiment; Figure 2 Figure 2 shows the structural schematic diagram of the liquid accumulator in the embodiment;
[0025] It further includes an ammonia water circulation tank 31 and a circulation pump 32 that are sequentially connected to the liquid accumulator 20. The ammonia water circulation tank 31 is communicated with the liquid accumulator 20, and the ammonia water in the liquid accumulator 20 is output to the ammonia water circulation tank 31.
[0026] It further includes a heat exchanger 33. The heat exchanger 33 is arranged in the rear section of the circulation pump 32, and the output end of the heat exchanger 33 is communicated to the spraying section 12 of the scrubbing tower 10.
[0027] The low-concentration ammonia water collected in the liquid accumulator 20 is sequentially transferred to the ammonia water circulation tank 31 and the heat exchanger 33. That is, the dilute ammonia water in the liquid accumulator 20 in the middle of the scrubbing tower 10 is collected and flows into the ammonia water circulation tank 31. The dilute ammonia water is pumped to the heat exchanger 33 by the circulation pump 32 for heat exchange, and finally sent to the top of the scrubbing tower 10 for absorption and sprayed out through the spraying section 12 to form a cycle. The heat exchanger 33 is a plate heat exchanger.
[0028] Working principle: The liquid accumulator 20 provided in this device collects the low-concentration ammonia water sprayed from the spraying section 12 of the scrubbing tower 10. The dilute ammonia water is collected and flows into the ammonia water circulation tank 31. The dilute ammonia water is pumped to the heat exchanger 33 by the circulation pump 32 for heat exchange, and finally sent to the top of the scrubbing tower 10 for absorption and sprayed out through the spraying section 12 to form a cycle.
[0029] A part of the low-concentration ammonia water sprayed by the spraying section 12 of the scrubbing tower 10 is returned to the spraying section 12 to continue absorbing ammonia in the circulating gas, and the other part continues to absorb the high-concentration ammonia water at the bottom of the tower, so that the entire scrubbing tower 10 forms an efficient absorption device with the ammonia water concentration gradually increasing from the top to the bottom. The high-concentration ammonia water is discharged and sent to carbonization, and the low-concentration ammonia water is recycled and absorbed multiple times, thereby ensuring the absorption efficiency and reducing the absorption cost.
[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.
Claims
1. Ammonia washing and recycling device for cyclohexylamine production, characterized in that, Comprising: A scrubbing tower (10), the scrubbing tower (10) includes an air inlet end (11) provided at the bottom end and a spraying section (12) provided in the upper section inside the scrubbing tower (10); A liquid accumulator (20), the liquid accumulator (20) is provided in the middle section inside the scrubbing tower (10), the liquid accumulator (20) includes a liquid accumulation plate (21) and a plurality of air holes (22) opened on the liquid accumulation plate (21), and an air lifting cap (23) communicated with each air hole (22) is correspondingly provided at each air hole (22).
2. The ammonia scrubbing and recovery device for cyclohexylamine production according to claim 1, characterized in that, It further includes an ammonia water circulation tank (31) and a circulation pump (32) which are sequentially connected to the liquid accumulator (20), the ammonia water circulation tank (31) is communicated with the liquid accumulator (20), and the ammonia water in the liquid accumulator (20) is output to the ammonia water circulation tank (31).
3. The ammonia gas washing and recovery device for cyclohexylamine production according to claim 2, wherein, It further includes a heat exchanger (33), the heat exchanger (33) is provided in the rear section of the circulation pump (32), and the output end of the heat exchanger (33) is communicated to the spraying section (12) of the scrubbing tower (10).
4. The ammonia gas washing and recovery device for cyclohexylamine production according to claim 1, characterized in that, The liquid accumulation plate (21) is spliced by a plurality of stainless steel plates, and eight air lifting caps (23) are provided.