Novel ammonia water preparation device

Abstract

The utility model relates to the field of ammonia water preparation, in particular to a novel ammonia water preparation device which comprises an ammonia water preparation kettle, a condenser, a pressure control system and a nitrogen inlet pipeline, the top of the ammonia water preparation kettle is communicated with a liquid ammonia feed pipe and a desalted water feed pipe, the bottom of the ammonia water preparation kettle is communicated with an ammonia water discharge pipe, the ammonia water discharge pipe is communicated with an ammonia water pump, the output end of the ammonia water pump is communicated with a condenser, and a return port of the condenser is communicated with the ammonia water preparation kettle; the top of the ammonia water preparation kettle is connected with a pressure control system; the pressure control system comprises a nitrogen inlet regulating valve, an exhaust regulating valve, a first switch valve, a second switch valve and a pressure remote meter arranged at the top of the ammonia water preparation kettle. The problems that the preparation temperature is too high and the preparation pressure is too high or too low are effectively solved. The preparation efficiency is improved; and the preparation pressure is adjustable.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia water preparation, in particular to an ammonia water preparation device. Background Art

[0002] In industrial production, a large amount of ammonia water is required.

[0003] The existing ammonia preparation equipment is mainly based on a preparation kettle. First, a sufficient amount of desalted water is injected into the ammonia preparation kettle, and then liquid ammonia is injected into the desalted water to prepare an ammonia solution of appropriate concentration. However, during the preparation process, liquid ammonia will release a large amount of heat after dissolving in water, causing the temperature of the ammonia preparation kettle to rise rapidly. As the concentration and temperature of the ammonia water increase, a large amount of ammonia gas will overflow, causing waste of materials and polluting the environment.

[0004] Chinese patent number 200920194910.2 discloses a device for preparing ammonia solution, which reduces the temperature of ammonia solution by using a vertical tube falling film absorber and a cooling tower to improve the preparation efficiency.

[0005] When liquid ammonia is combined with desalted water, as the temperature rises in a short period of time, a large amount of ammonia gas overflows, causing the pressure in the ammonia kettle to rise sharply, affecting the service life of the ammonia kettle, and even causing an explosion and a safety accident.

[0006] At present, no technical solution that can solve the above technical problems has been found in the existing public technologies. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a new ammonia water preparation device in view of the above shortcomings. Compared with the prior art, the new ammonia water preparation device can reduce the preparation temperature, reduce material waste, and improve the preparation efficiency; the pressure of the ammonia water preparation device can be adjusted and the impurity content in the ammonia water can be reduced.

[0008] In order to solve the above technical problems, the technical solution of the utility model is:

[0009] A novel ammonia solution preparation device comprises an ammonia solution preparation kettle, a condenser, a pressure control system and a nitrogen inlet pipeline; the top of the ammonia solution preparation kettle is connected with a liquid ammonia feed pipe and a desalted water feed pipe, the bottom of the ammonia solution preparation kettle is connected with an ammonia solution discharge pipe, the ammonia solution discharge pipe is connected with an ammonia solution pump, the output end of the ammonia solution pump is connected with the condenser, and the return port of the condenser is connected with the ammonia solution preparation kettle; the top of the ammonia solution preparation kettle is connected with the pressure control system; the pressure control system comprises a nitrogen inlet regulating valve, an exhaust regulating valve, a first switch valve, a second switch valve and a pressure remote gauge arranged on the top of the ammonia solution preparation kettle; the top of the ammonia solution preparation kettle is connected with the first switch valve and the second switch valve, the first switch valve is connected with the exhaust pipeline, one end of the second switch valve is connected with one end of the nitrogen inlet regulating valve and one end of the exhaust regulating valve, the other end of the nitrogen inlet regulating valve is connected with the nitrogen inlet pipeline, and the other end of the exhaust regulating valve is connected with the exhaust pipeline.

[0010] Furthermore, it also includes a recovery tank, in which desalted water is arranged, and the exhaust end of the exhaust pipe extends into the desalted water in the recovery tank.

[0011] Furthermore, the desalted water feed pipe is provided with a desalted water feed valve and a desalted water flowmeter in sequence; the liquid ammonia feed pipe is provided with a liquid ammonia regulating valve, a liquid ammonia feed cut-off valve and a liquid ammonia flowmeter in sequence; and the ammonia water preparation kettle is provided with a thermometer.

[0012] Furthermore, a jacket is arranged on the outer side of the ammonia water preparation kettle, and cold brine at -15°C is arranged in the jacket.

[0013] Furthermore, the discharge end of the liquid ammonia feed pipe extends into the bottom of the ammonia water preparation kettle.

[0014] Furthermore, a protective bursting disc is connected in parallel to the first switch valve.

[0015] The utility model adopts the above technical solution, and has the following advantages compared with the prior art:

[0016] The setting of the condenser and the jacket can lower the preparation temperature, reduce material waste and improve the preparation efficiency; the setting of the pressure control system makes the pressure in the ammonia water preparation kettle adjustable, and when the pressure in the ammonia water preparation kettle is low, the pressure can be adjusted by adding nitrogen to avoid other gas impurities from flowing into the ammonia water preparation kettle, reduce the impurity content in the ammonia water, and improve the purity of the ammonia water.

[0017] The setting of the recovery pool allows the discharged ammonia gas to be integrated into the desalted water, reducing environmental pollution. The recovered ammonia water can be used as a raw material for preparing ammonia water, reducing material waste.

[0018] The overall structure has a high degree of automation, reducing manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a novel ammonia water preparation device in an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a pressure control system in an embodiment of the utility model.

[0021] In the figure:

[0022] 1-ammonia preparation kettle, 101-jacket, 2-condenser, 3-pressure control system, 301-nitrogen inlet regulating valve, 302-exhaust regulating valve, 303-first switch valve, 304-second switch valve, 305-pressure remote gauge, 4-liquid ammonia feed pipe, 5-desalted water feed pipe, 6-ammonia discharge pipe, 7-ammonia pump, 8-exhaust pipeline, 9-nitrogen inlet pipeline, 10-recovery tank, 11-liquid ammonia regulating valve, 12-liquid ammonia feed cut-off valve, 13-liquid ammonia flowmeter, 14-thermometer, 15-desalted water feed valve, 16-desalted water flowmeter, 17-protective bursting disc. DETAILED DESCRIPTION

[0023] Embodiment 1, as Figure 1 As shown, a novel ammonia solution preparation device includes an ammonia solution preparation kettle 1, a condenser 2, a pressure control system 3 and a nitrogen inlet pipeline 9.

[0024] The ammonia water preparation kettle 1 can be a glass-lined reactor with a volume of 10m 3. In order to better reduce the preparation temperature, a jacket 101 is provided on the outside of the ammonia water configuration kettle 1, and -15°C cold brine is provided in the jacket 101; further, a circulation pump is connected to the outside of the jacket 101 to circulate the cold brine in the jacket 101, thereby better reducing the preparation temperature. The top of the ammonia water configuration kettle 1 is connected with a liquid ammonia feed pipe 4 and a desalted water feed pipe 5. The liquid ammonia feed pipe 4 connects the liquid ammonia storage tank with the ammonia water configuration kettle 1, and the desalted water feed pipe 5 connects the desalted water storage tank with the ammonia water configuration kettle 1. Preferably, the discharge end of the liquid ammonia feed pipe 4 extends into the bottom of the ammonia water configuration kettle 1, 400 mm away from the bottom of the kettle, to increase the absorption rate of the desalted water. When configuring ammonia water, first add a sufficient amount of desalted water to the ammonia water configuration kettle 1 and then add liquid ammonia. The bottom of the ammonia water preparation kettle 1 is connected to an ammonia water discharge pipe 6, and the ammonia water discharge pipe 6 is connected to an ammonia water pump 7. The output end of the ammonia water pump 7 is connected to the condenser 2, and the return port of the condenser 2 is connected to the ammonia water preparation kettle 1. The condenser 2 can be a shell and tube heat exchanger. During the preparation of ammonia water, the passage between the ammonia water pump 7 and the discharge end of the ammonia water discharge pipe 6 is closed, and the ammonia water pump 7 is started. After the liquid flows through the condenser 2 to cool down, it flows into the ammonia water preparation kettle 1. The condenser 2 can cool the ammonia water and desalted water. After the desalted water is cooled to 5°C, the subsequent operation of adding liquid ammonia can be carried out. After the preparation of ammonia water is completed, the passage between the ammonia water pump 7 and the condenser 2 is closed, and the ammonia water flows through the ammonia water discharge pipe 6 and is discharged into the ammonia water storage tank. During the process of discharging ammonia water, due to the action of gravity and the ammonia water pump 7, the ammonia water will flow out of the ammonia water preparation kettle 1 rapidly and in large quantities. If the nitrogen supplemented by the pressure control system 3 is not timely and sufficiently supplemented to the ammonia water preparation kettle 1, a pressure difference will be generated inside and outside the ammonia water preparation kettle 1, thereby squeezing the ammonia water preparation kettle 1 and reducing its service life. Therefore, the ammonia water discharge pipe 6 extends out of the branch and communicates with the ammonia water preparation kettle 1, so that the ammonia water can flow back into the ammonia water preparation kettle 1 to balance the pressure difference inside and outside the ammonia water preparation kettle 1.

[0025] The top of the ammonia water preparation kettle 1 is connected to the pressure control system 3. Figure 2 As shown, the pressure control system 3 includes a nitrogen inlet regulating valve 301, an exhaust regulating valve 302, a first switch valve 303, a second switch valve 304 and a pressure remote gauge 305. The pressure remote gauge 305 is arranged at the top of the ammonia water configuration kettle 1, and the pressure remote gauge 305 measures the pressure in the ammonia water configuration kettle 1. The top of the ammonia water configuration kettle 1 is connected to the first switch valve 303, and the first switch valve 303 is connected to the exhaust pipe 8. The top of the ammonia water configuration kettle 1 is connected to the second switch valve 304, one end of the second switch valve 304 is connected to one end of the nitrogen inlet regulating valve 301, the other end of the nitrogen inlet regulating valve 301 is connected to the nitrogen inlet pipe 9, one end of the second switch valve 304 is connected to one end of the exhaust regulating valve 302, and the other end of the exhaust regulating valve 302 is connected to the exhaust pipe 8.

[0026] When adding liquid ammonia, the second switch valve 304 is closed and the first switch valve 303 is opened to balance the pressure difference in the ammonia solution preparation kettle 1. Preferably, a protective bursting disc 17 is connected in parallel to the first switch valve 303, and the pressure remote gauge 305 is automatically interlocked with the protective bursting disc 17. When the reading of the pressure remote gauge 305 is higher than 300 kpa and when the first switch valve 303 is opened, the protective bursting disc 17 is detonated to discharge the pressure, thereby ensuring the safety of the ammonia solution preparation kettle 1. The pressure remote gauge 305 is automatically interlocked with the nitrogen inlet regulating valve 301 and the exhaust regulating valve 302, respectively. In the case of adding liquid ammonia, the second switch valve 304 is opened and the first switch valve 303 is closed; when the reading of the pressure remote gauge 305 is lower than 3kpa, the nitrogen inlet regulating valve 301 is started to supplement the pressure value to 100kpa, and when the reading of the pressure remote gauge 305 is higher than 300kpa, the exhaust regulating valve 302 is started to discharge the excess gas in the ammonia water configuration kettle 1 to balance the pressure difference in the ammonia water configuration kettle 1. The setting of the pressure control system 3 makes the pressure in the ammonia water configuration kettle 1 adjustable, and the pressure can be adjusted by adding nitrogen when the pressure in the ammonia water configuration kettle 1 is low, so as to prevent other gas impurities from flowing into the ammonia water configuration kettle 1, reduce the impurity content in the ammonia water, and improve the purity of the ammonia water.

[0027] A novel ammonia water preparation device also includes a recovery tank 10, in which desalted water is arranged, and the exhaust end of the exhaust pipe 8 extends into the desalted water in the recovery tank 10. The exhausted ammonia gas and the desalted water are prepared into ammonia water to avoid environmental pollution, and when the purity of the ammonia water is not required to be high, the recovered ammonia water can also be used as a substitute for desalted water and become a raw material for preparing ammonia water, thereby reducing material waste.

[0028] The desalted water feed pipe 5 is provided with a desalted water feed valve 15 and a desalted water flowmeter 16 in sequence. The desalted water feed valve 15 and the desalted water flowmeter 16 are started, and the desalted water feed valve 15 and the desalted water flowmeter 16 are automatically interlocked, and an interlocking value is set. After reaching the set value, the desalted water feed valve 15 is automatically closed. The liquid ammonia feed pipe 4 is provided with a liquid ammonia regulating valve 11, a liquid ammonia feed cut-off valve 12 and a liquid ammonia flowmeter 13 in sequence; the ammonia water preparation kettle 1 is provided with a thermometer 14; the liquid ammonia feed cut-off valve 12, the liquid ammonia flowmeter 13 and the liquid ammonia regulating valve 11 are started, and the liquid ammonia feed cut-off valve 12 and the liquid ammonia flowmeter 13 are automatically interlocked, and an interlocking value is set. After reaching the set value, the liquid ammonia feed cut-off valve 12 is automatically closed, and the thermometer 14 is automatically interlocked with the liquid ammonia regulating valve 11, and the amount of liquid ammonia added is adjusted by the liquid ammonia regulating valve 11 to control the temperature of the ammonia water preparation kettle 1 between 10 and 20°C. Taking the configuration of 20% ammonia water as an example, the interlocking value between the liquid ammonia flowmeter 13 and the liquid ammonia feed cut-off valve 12 can be 1200kg, and the interlocking value between the desalted water feed valve 15 and the desalted water flowmeter 16 can be 4800kg.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A novel ammonia solution preparation device, characterized in that , including an ammonia water preparation kettle (1), a condenser (2), a pressure control system (3) and a nitrogen inlet pipeline (9); The top of the ammonia water preparation kettle (1) is connected to a liquid ammonia feed pipe (4) and a desalted water feed pipe (5); the bottom of the ammonia water preparation kettle (1) is connected to an ammonia water discharge pipe (6); the ammonia water discharge pipe (6) is connected to an ammonia water pump (7); the output end of the ammonia water pump (7) is connected to the condenser (2); and the return port of the condenser (2) is connected to the ammonia water preparation kettle (1); The top of the ammonia solution preparation kettle (1) is connected to the pressure control system (3); the pressure control system (3) comprises a nitrogen inlet regulating valve (301), an exhaust regulating valve (302), a first switch valve (303), a second switch valve (304) and a pressure remote gauge (305) arranged on the top of the ammonia solution preparation kettle (1); the top of the ammonia solution preparation kettle (1) is connected to the first switch valve (303) and the second switch valve (304); the first switch valve (303) is connected to an exhaust pipeline (8); one end of the second switch valve (304) is connected to one end of the nitrogen inlet regulating valve (301) and one end of the exhaust regulating valve (302); the other end of the nitrogen inlet regulating valve (301) is connected to the nitrogen inlet pipeline (9); and the other end of the exhaust regulating valve (302) is connected to the exhaust pipeline (8).

2. A novel ammonia solution preparation device as claimed in claim 1, characterized in that: It also comprises a recovery pool (10), wherein desalted water is arranged in the recovery pool (10), and an exhaust end of the exhaust pipe (8) extends into the desalted water in the recovery pool (10).

3. A novel ammonia solution preparation device as claimed in claim 1, characterized in that: The desalted water feed pipe (5) is provided with a desalted water feed valve (15) and a desalted water flow meter (16) in sequence; the liquid ammonia feed pipe (4) is provided with a liquid ammonia regulating valve (11), a liquid ammonia feed cut-off valve (12) and a liquid ammonia flow meter (13) in sequence; and the ammonia water preparation kettle (1) is provided with a thermometer (14).

4. A novel ammonia solution preparation device as claimed in any one of claims 1 to 3, characterized in that: A jacket (101) is arranged outside the ammonia water preparation kettle (1), and cold brine at -15°C is arranged inside the jacket (101).

5. A novel ammonia solution preparation device as claimed in any one of claims 1 to 3, characterized in that: The discharge end of the liquid ammonia feed pipe (4) extends into the bottom of the ammonia water preparation kettle (1).

6. A novel ammonia solution preparation device as claimed in any one of claims 1 to 3, characterized in that: A protective bursting disc (17) is connected in parallel to the first switch valve (303).

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