High-purity ammonia and waste ammonia recovery system

Abstract

The utility model relates to a high-purity ammonia and waste ammonia recovery system, which belongs to the technical field of industrial wastewater treatment and comprises a rectifying tower, a light discharge outlet is arranged at the top of the rectifying tower, and a heavy discharge outlet and a crude ammonia recovery port are arranged at the bottom of the rectifying tower; the light component discharging outlet is communicated with a light component discharging system; the de-weighting outlet is communicated with a de-weighting system; according to the ammonia gas recovery device, the separation purpose can be achieved by utilizing the characteristic that the volatility of each component in a system is different, and waste ammonia is purified and filtered through the light component discharging or heavy component discharging process.

Description

Technical Field

[0001] The utility model relates to a high-purity ammonia and waste ammonia recovery system, belonging to the technical field of industrial wastewater treatment. Background Technique

[0002] As electrolysis raw materials, if waste ammonia can be recycled, a part of it can be recycled to the crude ammonia storage tank and then re-enter the low-boiling tower, and another part can be sold externally as ammonia water made from waste ammonia; this not only reduces waste of resources but also lowers production costs; therefore, there is an urgent market demand for a set of recovery systems.

[0003] According to the quadruple heat recovery ammonia water absorption refrigeration and power generation system disclosed in Chinese invention patent CN106352593A, it includes: a second heat recovery device, an evaporator, a generator, an ammonia gas purifier, an absorption-condensation-liquid storage device, a plate heat exchanger, a first heat recovery device and a power generation component connected in sequence, wherein: the power generation component is connected to the ammonia gas purifier, and the ammonia gas purifier is connected to the first heat recovery device; the second heat recovery device is respectively connected to the evaporator and the absorption-condensation-liquid storage device; the ammonia gas purifier is provided with a first heat exchange coil and a second heat exchange coil, and the first heat exchange coil, the second heat exchange coil, the first heat recovery device and the second heat recovery device together realize quadruple heat recovery, and the ammonia gas purifier can supply power to the power generation component; the present invention can effectively improve the coefficient of performance COP of the ammonia water absorption refrigeration and power generation system, has a compact structure, and is conducive to the miniaturization of the ammonia water adsorption refrigeration unit.

[0004] During the process of discharging light components or discharging heavy components, the light components at the top of the rectification tower enter the tail gas absorption through the tail gas condenser, and the operation process takes a long time, and the process of discharging light components or discharging heavy components is often carried out, resulting in waste of a part of high-purity ammonia. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: to provide an ammonia gas recovery device, which can utilize the characteristics of different volatilities of each component in the material system to achieve the separation purpose, and carry out the purification and filtration of ammonia gas through the process of discharging heavy components or discharging light components.

[0006] The high-purity ammonia and waste ammonia recovery system described in the utility model

[0007] includes a rectification tower, a light component discharge outlet is opened at the top of the rectification tower, and a heavy component discharge outlet and a crude ammonia recovery port are opened at the bottom of the rectification tower;

[0008] The light component discharge outlet is communicated with a light component discharge system;

[0009] The heavy component discharge outlet is communicated with a heavy component discharge system.

[0010] Further, the light component discharge system includes a tail gas condenser, the light component discharge outlet is communicated with the tail gas condenser through a light component discharge pipeline, and the tail gas condenser is communicated with a water unit;

[0011] The tail gas condenser is connected to a liquid ammonia receiving tank;

[0012] The liquid ammonia receiving tank is provided with a high-purity ammonia outlet, and the high-purity ammonia outlet is connected to a high-purity ammonia storage tank;

[0013] The liquid ammonia receiving tank is also provided with an electrolyte raw material outlet, and the electrolyte raw material outlet is connected to the electrolysis workshop;

[0014] The liquid ammonia receiving tank is also provided with a crude ammonia outlet, and the crude ammonia outlet is connected to a crude ammonia storage tank;

[0015] The crude ammonia storage tank is connected to the distillation column through a crude ammonia recovery pipe.

[0016] Furthermore, the tail gas condenser is connected to a water unit, and the tail gas condenser is provided with a condensate inlet, and the condensate inlet is connected to the water unit.

[0017] Furthermore, the temperature range of the condensate is 3°C to 8°C.

[0018] Furthermore, the weight discharging system includes a tail gas buffer tank, and the tail gas buffer tank is connected to the weight discharging outlet.

[0019] Furthermore, an oil-water sewage discharge port is opened at the bottom of the tail gas buffer tank.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] A high-purity ammonia and waste ammonia recovery system described in the present utility model;

[0022] 1. The crude ammonia (i.e., the ammonia water containing an oil-water mixture) passes through the distillation column, and the ammonia water and the oil-water mixture are separated by using the distillation principle. The ammonia gas generated after the distillation of the ammonia water enters the light discharging system through the light discharging outlet, and the oil-water mixture enters the weight discharging system through the weight discharging outlet; successfully realizing the separation of ammonia water from light / heavy components, and recycling the recoverable ammonia water;

[0023] 2. Making the non-recoverable liquid ammonia into ammonia water reduces the waste of resources and lowers the production cost. Description of the Drawings

[0024] Figure 1 It is a process flow diagram of an embodiment of the present utility model.

[0025] In the figure: 1. Distillation column; 2. Light discharging system; 3. Weight discharging system;

[0026] 11. Light discharging outlet; 12. Weight discharging outlet; 13. Crude ammonia recovery port;

[0027] 21. Tail gas condenser; 22. Light discharging pipeline; 23. Water unit; 24. Liquid ammonia receiving tank; 25. High-purity ammonia storage tank; 26. Electrolysis workshop; 27. Crude ammonia storage tank;

[0028] 211. Condensate inlet

[0029] 241. High-purity ammonia outlet; 242. Electrolyte raw material outlet; 243. Crude ammonia outlet

[0030] 31. Tail gas buffer tank

[0031] 311. Oil and water drain port; 312. Crude ammonia recovery pipe Specific implementation mode

[0032] Embodiment 1

[0033] As Figure 1 shown, a high-purity ammonia and waste ammonia recovery system of the present utility model

[0034] includes a rectification tower 1. A light component discharge outlet 11 is opened at the top of the rectification tower 1, and a heavy component discharge outlet 12 and a crude ammonia recovery port 13 are opened at the bottom of the rectification tower 1

[0035] The light component discharge outlet 11 is communicated with a light component discharge system 2

[0036] The heavy component discharge outlet 12 is communicated with a heavy component discharge system 3

[0037] The ammonia water containing impurities (i.e., the ammonia water contains an oil-water mixture) passes through the rectification tower 1. The ammonia water and the oil-water mixture are separated by using the rectification principle. The ammonia gas generated after the ammonia water is distilled enters the light component discharge system 2 through the light component discharge outlet 11, and the oil-water mixture enters the heavy component discharge system 3 through the heavy component discharge outlet 12. The separation of liquid ammonia from light / heavy components is successfully realized, the recoverable liquid ammonia is recycled, and the non-recoverable liquid ammonia is made into ammonia water for external sale, which not only reduces the waste of resources but also reduces the production cost

[0038] It is estimated that 7.956 t / month of waste ammonia can be recovered, saving 32,000 yuan / month in cost

[0039] As Figure 1 shown, as an optimization, the light component discharge system 2 includes a tail gas condenser 21. The light component discharge outlet 11 is communicated with the tail gas condenser 21 through a light component discharge pipe 22, and the tail gas condenser 21 is communicated with a water chiller 23

[0040] The tail gas condenser 21 is communicated with a liquid ammonia receiving tank 24

[0041] The liquid ammonia receiving tank 24 is provided with a high-purity ammonia outlet 241, and the high-purity ammonia outlet 241 is communicated with a high-purity ammonia storage tank 25

[0042] The liquid ammonia receiving tank 24 is also provided with an electrolyte raw material outlet 242, and the electrolyte raw material outlet 242 is communicated with an electrolysis workshop 26

[0043] The liquid ammonia receiving tank 24 is also provided with a crude ammonia outlet 243, and the crude ammonia outlet 243 is communicated with the crude ammonia storage tank 27;

[0044] The crude ammonia storage tank 27 is communicated with the distillation column 1 through a crude ammonia recovery pipe 312.

[0045] The tail gas condenser 21 is used to cool the ammonia gas separated in the distillation column 1 to form liquid ammonia. The water chiller 23 provides condensed water to control the temperature in the tail gas condenser 21; the liquid ammonia receiving tank 24 is used to receive the liquid ammonia condensed in the tail gas condenser 21, and the waste generated in the liquid ammonia enters the electrolysis workshop 26 for electrolysis reaction; the crude ammonia receiving tank is used to receive the condensed crude ammonia, and the crude ammonia re-enters the distillation column 1 through the crude ammonia recovery pipe 312 for a new round of distillation, liquefaction, and impurity removal process.

[0046] As Figure 1 shown, as an optimization, the tail gas condenser 21 is communicated with the water chiller 23, and the tail gas condenser 21 is provided with a condensed water inlet 211, and the condensed water inlet 211 is communicated with the water chiller 23.

[0047] The water chiller 23 discharges the condensed water into the tail gas condenser 21 through a condensed water drain pipe to provide a temperature environment for ammonia liquefaction.

[0048] As Figure 1 shown, as an optimization, the temperature range of the condensed water is 3°C to 8°C.

[0049] As an optimization, the temperature of the condensed water can be 3°C, 5°C, or 8°C.

[0050] As Figure 1 shown, as an optimization, the weight discharge system 3 includes a tail gas buffer tank 31, and the tail gas buffer tank 31 is communicated with the weight discharge outlet 12.

[0051] The tail gas buffer tank 31 is used to accommodate the oil-water mixture and a part of ammonia gas generated during the weight discharge process through the weight discharge outlet 12, and the ammonia gas enters the tail gas condenser 21 through a pipeline for ammonia condensation reaction to generate liquid ammonia.

[0052] As Figure 1 shown, as an optimization, the bottom of the tail gas buffer tank 31 is provided with an oil-water sewage outlet 311.

[0053] The oil-water sewage outlet 311 is used to discharge the oil-water mixture at the bottom of the tail gas buffer tank 31.

[0054] Working process or working principle:

[0055] In this system, the light components discharged from the top of the rectification column 1 at the current stage are recovered to the tail gas condenser 21 through the light discharging process. The cooling capacity in the tail gas condenser 21 is provided by the 5°C condensed water produced by the water chiller unit 23. A liquid ammonia receiving tank 24 is connected to the tail gas condenser 21. Part of the liquid ammonia entering the liquid ammonia receiving tank 24 is recovered to the crude ammonia storage tank 27 and then re-enters the rectification column 1. Part of it directly enters the high-purity ammonia storage tank 25, and the other part is used by the electrolysis workshop 26. The waste ammonia discharged during the heavy discharging process is discharged into the tail gas buffer tank 31. The ammonia gas enters the tail gas condenser 21 and is recycled together with the liquid ammonia generated during the light discharging process. The oil-water mixture in the tail gas buffer tank 31 is regularly cleaned through the oil-water drain port 311.

[0056] In the present utility model, the description of the directions and relative positional relationships of the structures, such as the descriptions of front, back, left, right, up, and down, does not constitute a limitation to the present utility model and is only for convenience of description.

Claims

1. A high-purity ammonia and waste ammonia recovery system, characterized in that: The distillation tower (1) comprises a light exhaust outlet (11) at the top of the distillation tower (1), and a heavy exhaust outlet (12) and a crude ammonia recovery outlet (13) at the bottom of the distillation tower (1); The light exhaust outlet (11) is connected to the light exhaust system (2); The weight removal outlet (12) is connected to the weight removal system (3).

2. The high-purity ammonia and waste ammonia recovery system according to claim 1, characterized in that: The exhaust system (2) includes an exhaust condenser (21), the exhaust outlet (11) is connected to the exhaust condenser (21) via a exhaust pipe (22), and the exhaust condenser (21) is connected to a water unit (23); The tail gas condenser (21) is connected to a liquid ammonia receiving tank (24); The liquid ammonia receiving tank (24) is provided with a high-purity ammonia outlet (241), and the high-purity ammonia outlet (241) is connected to the high-purity ammonia storage tank (25); The liquid ammonia receiving tank (24) is also provided with an electrolyte raw material outlet (242), and the electrolyte raw material outlet (242) is connected to the electrolysis workshop (26); The liquid ammonia receiving tank (24) is also provided with a crude ammonia outlet (243), and the crude ammonia outlet (243) is connected to the crude ammonia storage tank (27); The crude ammonia storage tank (27) is connected to the distillation tower (1) via a crude ammonia recovery pipe (312).

3. The high-purity ammonia and waste ammonia recovery system according to claim 2, characterized in that: The tail gas condenser (21) is connected to the water unit (23). The tail gas condenser (21) is provided with a condensed water inlet (211), and the condensed water inlet (211) is connected to the water unit (23).

4. The high-purity ammonia and waste ammonia recovery system according to claim 3, characterized in that: The temperature of the condensed water ranges from 3°C to 8°C.

5. The high-purity ammonia and waste ammonia recovery system according to claim 4, characterized in that: The weight removal system (3) comprises an exhaust gas buffer tank (31), and the exhaust gas buffer tank (31) is connected to the weight removal outlet (12).

6. The high-purity ammonia and waste ammonia recovery system according to claim 5, characterized in that: An oil and water discharge port (311) is provided at the bottom of the tail gas buffer tank (31).

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