Absorption device for ammonia-containing tail gas in butyramide production process water
By designing an absorption device including falling film absorber and condenser, the problem of ammonia in the exhaust gas cannot be completely absorbed during the butylamide production process is solved, efficient ammonia removal and reuse is achieved, and the processing pressure and production cost of subsequent equipment are reduced.
Patent Information
- Application Number
- CN202421323761.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-11
AI Technical Summary
During the butylamide production process, the secondary condensation of the stripper tower cannot completely absorb the ammonia in the exhaust gas, causing ammonia to enter the post-sequence RTO system, causing equipment blockage and data exceeding the standard.
An absorption device including a falling film absorber, a falling film absorbing water storage tank, a fin condenser and a circulating condenser is designed to treat ammonia in the exhaust gas by circulating absorption and condensing, and the absorption effect is controlled using pH and temperature monitoring.
It achieves efficient absorption of ammonia in the exhaust gas, and the ammonia removal rate can reach 98%, reducing the processing pressure of the RTO system, and reusing high-concentration ammonia water to the original medicine workshop to reduce production costs.
Smart Images
Figure CN222586068U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical production, and specifically relates to an absorption device for ammonia tail gas contained in water in a butanamide production process. Background Art
[0002] In the chemical production process of evaporation and stripping products, ammonia is contained in the tail gas. For example, in the production of butyramide products, the butyramide process water produced in the production process will contain chloroform and trace butyramide, and the wastewater will decompose and produce a large amount of ammonia during weak acid stripping; but the secondary condensation of the stripping tower in the existing process cannot completely absorb the ammonia in the tail gas, which will cause a large amount of ammonia to enter the subsequent RTO system, causing the furnace in the subsequent equipment to be blocked, the ammonium salt filter to be blocked, and other data to exceed the standard. Therefore, it is necessary to treat the tail gas after the secondary condensation of the stripping tower to solve the above problems. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide an absorption device for ammonia tail gas contained in water in a butanamide production process, which overcomes the defects in the prior art, can effectively absorb residual ammonia in the tail gas of the stripping tower, recycle the absorption liquid, and reduce the processing pressure of the RTO system of the subsequent equipment.
[0004] In order to solve the above technical problems, the technical solution of the utility model is:
[0005] A device for absorbing ammonia-containing tail gas in water of a butyramide production process comprises a falling film absorber, wherein the discharge port of the falling film absorber is connected to the feed port of a falling film absorption water storage tank through a pipeline, the falling film absorption water storage tank is provided with a gas outlet and a liquid outlet, the gas outlet of the falling film absorption water storage tank is connected to the feed port of a first condenser through a pipeline; the first condenser is provided with a tail gas outlet and a condensed water outlet, the condensed water outlet of the first condenser is connected to the feed port of the falling film absorption water storage tank through a pipeline; the liquid outlet of the falling film absorption water storage tank is connected to the feed port of the falling film absorber through a pipeline, a circulation pump and a second condenser (to continue to absorb ammonia in the ammonia-containing tail gas input from the feed port).
[0006] Preferably, a thermometer and a pH meter are provided on the pipeline from the falling film absorber to the falling film absorption water storage tank.
[0007] Preferably, the falling film absorber is of model E23--00001 shell and tube heat exchanger, and the manufacturer is Shandong Qinglei Environmental Technology Co., Ltd.
[0008] Preferably, an absorption liquid inlet is provided on one side of the upper part of the falling film absorption water storage tank, and the absorption liquid inlet is connected to the water storage tank through a pipeline. When the ammonia concentration of the absorption liquid is saturated, the absorption liquid needs to be emptied and water is added to make new absorption liquid.
[0009] Preferably, the falling film absorption water storage tank is provided with a liquid level meter to monitor the liquid level in the tank.
[0010] Preferably, the pipeline from the circulation pump to the second condenser is also connected to an absorption liquid discharge pipeline, so as to discharge the high-concentration ammonia water obtained by absorption to a high-concentration ammonia water tank for standby use.
[0011] Preferably, the model of the first condenser is a fin condenser, and the manufacturer is Shandong Zixiang Machinery Equipment Manufacturing Co., Ltd.
[0012] Preferably, the tail gas outlet of the first condenser is connected to a subsequent RTO system processing system.
[0013] Preferably, the second condenser is an absorption liquid condenser, the model is ES219B*160 wound tube heat exchanger, and the manufacturer is Shandong Haomai Machinery Manufacturing Co., Ltd.
[0014] Preferably, a thermometer is provided on the pipeline from the second condenser to the falling film absorber.
[0015] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0016] 1. The utility model absorbs ammonia in tail gas through a falling film absorption device. Tail gas is circulated and absorbed in the falling film absorber, and the ammonia removal rate can reach 98%. The high-concentration ammonia water obtained after absorption is discharged to a high-concentration ammonia water tank for reuse in the original drug workshop; the falling film absorption device can not only absorb ammonia in tail gas, but also reuse the absorbed ammonia to the original drug workshop, reducing the production cost of the original drug workshop.
[0017] 2. The falling film absorption device of the utility model adopts three condensers, namely, falling film absorber, finned condenser and circulating condenser, to circulate heat and absorb ammonia in the tail gas. During the absorption period, pH and temperature are used to observe and control whether the ammonia in the tail gas is completely absorbed.
[0018] In short, the utility model has a simple process flow, the absorption liquid can be reused, the ammonia in the tail gas can be effectively reduced, the processing pressure of the RTO system is reduced, and the production cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;
[0020] In the figure, 1. Falling film absorber; 2. Falling film absorption water storage tank; 3. Finned condenser; 4. Circulation pump; 5. Absorption liquid condenser; 6. Absorption liquid discharge pipe; 7. High concentration ammonia water tank; 8. Discharge port; 9. Gas outlet; 10. Liquid inlet; 11. Tail gas outlet; 12. Condensate water outlet; 13. Feed inlet. DETAILED DESCRIPTION
[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0022] Embodiment 1:
[0023] like Figure 1 As shown, an absorption device for ammonia tail gas contained in water of a butyramide production process comprises a falling film absorber 1, a discharge port 8 of the falling film absorber 1 is connected to a feed port (not marked) of a falling film absorption water storage tank 2 through a pipeline, the falling film absorption water storage tank 2 is provided with a gas outlet 9 and a liquid inlet 10, the gas outlet of the falling film absorption water storage tank 2 is connected to a feed port 13 of a fin condenser 3 (first condenser) through a pipeline; the fin condenser 3 is provided with a tail gas outlet 11 and a condensed water outlet 12, the condensed water outlet of the fin condenser 3 is connected to the feed port of the falling film absorption water storage tank 2 through a pipeline; the liquid outlet of the falling film absorption water storage tank 2 is connected to the feed port of the falling film absorber 1 through a pipeline, a circulating pump 4 and an absorption liquid condenser 5 (second condenser).
[0024] The pipeline from the circulation pump 4 to the absorption liquid condenser 5 is also connected to an absorption liquid discharge pipeline 6 .
[0025] In actual production: the butyramide process water produced in the production process of butyramide enters the stripping tower (not shown) to strip low-boiling substances, and the tail gas condensed by the low-boiling substances through the secondary condenser (not shown) is input into the falling film absorber 1. The condensate obtained after condensation and absorption of circulating water passes through a thermometer and a pH meter (used to detect the temperature and pH value of the condensate and judge the concentration of ammonia in the condensate) and enters the falling film absorption water storage tank 2. The uncondensed tail gas in the falling film absorption water storage tank 2 enters the fin condenser 3, and the condensed condensate flows back to the falling film absorption water storage tank 2. The tail gas that cannot be condensed enters the RTO system of the workshop through the tail gas outlet for treatment. The liquid in the falling film absorption water storage tank 2 passes through the circulating pump 4 and enters the absorption liquid condenser 5 for cooling, and then is measured by the online monitoring thermometer set on the pipeline. The liquid whose temperature is reduced to meet the process requirements flows back to the falling film absorber 1 to circulate and absorb ammonia in the tail gas. When the absorption liquid in the falling film absorption water storage tank 2 is saturated or the liquid level reaches a certain height, it is discharged into the high-concentration ammonia water tank 7 in the workshop through the circulation pump 4 and the absorption liquid discharge pipe 6 for reuse. When the saturated absorption liquid is discharged, water is added from the external water tank to the falling film absorption water storage tank 2 as new absorption liquid to continue to absorb ammonia in the tail gas.
[0026] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.
Claims
1. An absorption device for ammonia tail gas in butyramide production process water, characterized in that: It includes a falling film absorber, the discharge port of the falling film absorber is connected to the feed port of a falling film absorption water storage tank through a pipeline, the falling film absorption water storage tank is provided with a gas outlet and a liquid outlet, the gas outlet of the falling film absorption water storage tank is connected to the feed port of a first condenser through a pipeline; the first condenser is provided with a tail gas outlet and a condensed water outlet, the condensed water outlet of the first condenser is connected to the feed port of the falling film absorption water storage tank through a pipeline; the liquid outlet of the falling film absorption water storage tank is connected to the feed port of the falling film absorber through a pipeline, a circulating pump and a second condenser.
2. The device for absorbing ammonia tail gas in butyramide production process water according to claim 1, characterized in that: A thermometer and a pH meter are provided on the pipeline from the falling film absorber to the falling film absorption water storage tank.
3. The device for absorbing ammonia tail gas in butyramide production process water according to claim 1, characterized in that: An absorption liquid inlet is arranged on one side of the upper part of the falling film absorption water storage tank, and the absorption liquid inlet is connected to the water storage tank through a pipeline.
4. The device for absorbing ammonia tail gas in butyramide production process water according to claim 1, characterized in that: The falling film absorption water storage tank is provided with a liquid level meter.
5. The device for absorbing ammonia tail gas in butyramide production process water according to claim 1, characterized in that: The pipeline from the circulation pump to the second condenser is also connected with an absorption liquid discharge pipeline.
6. The device for absorbing ammonia tail gas in butyramide production process water according to claim 1, characterized in that: The first condenser is a fin condenser, and the second condenser is an absorption liquid condenser.
7. The device for absorbing ammonia tail gas in butyramide production process water according to claim 1, characterized in that: A thermometer is provided on the pipeline from the second condenser to the falling film absorber.