High-stability ammonia water preparation production device and production process

Abstract

The present application relates to the technical fields of ammonia water preparation, and discloses a high-stability ammonia water preparation production device and production process, which directly prepares ammonia water by using liquid ammonia, avoids the process of ammonia vaporization and then liquefaction and heating and then cooling in the traditional process, and designs a device of a preparation device, which is different from a previous ammonia absorber, the working process of the ammonia absorber is water absorption of gaseous ammonia, and the process of the preparation device is liquid ammonia dissolution in water under constant pressure, compared with the traditional ammonia water preparation process, the preparation device has good stability, can save more than 80% of investment, reduce more than 80% of land occupation, greatly reduce operation energy consumption and cost, and does not need special operation personnel.

Description

Technical Field

[0001] This invention relates to the field of ammonia preparation technology, specifically to a highly stable ammonia preparation production apparatus and process. Background Technology

[0002] The traditional process of preparing ammonia water using liquid ammonia in industry has been used for many years. It typically involves the vaporization of liquid ammonia followed by absorption by pure water. Traditional ammonia absorbers can vary in type, such as jet ammonia absorbers and high-level ammonia absorbers. The types of evaporators and coolers can also differ, as can the heat exchange media, but the overall process flow is roughly the same. The traditional ammonia water preparation process consists of multiple pieces of equipment, requiring a certain amount of area and space. Furthermore, the evaporation of liquid ammonia into gaseous ammonia requires heating, and the dissolution of gaseous ammonia into water after passing through the ammonia absorber is exothermic, necessitating cooling.

[0003] Another method is to directly dissolve liquid ammonia in water to prepare ammonia solution, eliminating the dual energy consumption of heating and evaporating liquid ammonia and releasing heat during the dissolution and cooling of gaseous ammonia. However, this method also has many problems due to the special properties of ammonia. Liquid ammonia is highly volatile, so when liquid ammonia is transported through pipelines, some gaseous ammonia is always present, effectively resulting in a two-phase co-flow. Ammonia dissolves very quickly in water, but the dissolution of gaseous ammonia in water can easily produce a loud, popping sound and vibration, which is caused by the elimination of gaseous ammonia bubbles during rapid dissolution. The dissolution of gaseous ammonia in water generates a large amount of heat of solution, causing the temperature of the ammonia solution to rise significantly, requiring external cooling. Before the high-temperature ammonia solution cools down, it may carry gaseous ammonia, which then dissolves in the water during cooling, potentially causing popping sounds and vibrations. Avoiding these popping sounds and vibrations is key to solving the problem. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a highly stable ammonia water preparation and production device and process, which has good stability, low cost, and high efficiency.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a production process for preparing highly stable ammonia water, comprising the following steps:

[0008] (1) Add the soft water from the water softening unit to the ammonia water preparation system. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 170-175 kg / t.

[0009] (2) Maintain the water feed rate. The ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 20-25%, start the ammonia water transfer pump and open the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe, and close the soft valve.

[0010] (3) Adjust the system pressure;

[0011] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 820-830 kg / t. After passing through the total flow meter, it is divided into two streams, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 14-16℃ by the secondary cooler.

[0012] (5) When the ammonia concentration detector shows a concentration of 17-18%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 950-1050 kg / t, and highly stable ammonia is obtained.

[0013] Preferably, the pressure of the water softener in (1) is 0.3-0.32 MPa.

[0014] Preferably, the water feed rate in step (2) is 0.8-1 m³. 3 / h.

[0015] Preferably, the preparation pressure in (3) is 0.9-1.0 MPa.

[0016] Preferably, the temperature of the secondary cooler in (4) is controlled at 14-16℃.

[0017] Preferably, the system includes a water softening device, an ammonia preparation system, a circulating pump, an ammonia storage tank, an ammonia delivery pump, a primary mixer, and a secondary mixer connected in sequence.

[0018] (III) Beneficial Technical Effects

[0019] This invention enables the direct preparation of ammonia water using liquid ammonia, avoiding the traditional process of vaporizing and liquefying ammonia, and heating and cooling it. A preparation device is designed that differs from existing ammonia absorbers. While the absorber uses water to absorb gaseous ammonia, the preparation device utilizes constant pressure to dissolve liquid ammonia in water. Compared to traditional ammonia preparation processes, this method offers better stability. It can process the same amount of ammonia, saving over 80% in investment and reducing floor space by over 80%. Operating energy consumption and costs are also significantly reduced, and no dedicated operators are required. Attached Figure Description

[0020] Figure 1 It is a highly stable ammonia water preparation and production device. Detailed Implementation

[0021] Example 1

[0022] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.3 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 170 kg / t.

[0023] (2) Maintain a water feed rate of 0.8 m³. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 20%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0024] (3) Adjust the system preparation pressure to 0.9 MPa;

[0025] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 820 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 14℃ by the secondary cooler.

[0026] (5) When the ammonia concentration detector shows a concentration of 17%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 950 kg / t, and highly stable ammonia is obtained.

[0027] Example 2

[0028] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.32 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 175 kg / t.

[0029] (2) Maintain a water feed rate of 1 m³ / min. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 25%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0030] (3) Adjust the system preparation pressure to 1.0 MPa;

[0031] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 830 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 16℃ by the secondary cooler.

[0032] (5) When the ammonia concentration detector shows a concentration of 18%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 1050 kg / t, and highly stable ammonia is obtained.

[0033] Example 3

[0034] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.31 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 172.5 kg / t.

[0035] (2) Maintain a water feed rate of 0.9 m³. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 22.5%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0036] (3) Adjust the system preparation pressure to 0.95 MPa;

[0037] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 825 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 15℃ by the secondary cooler.

[0038] (5) When the ammonia concentration detector shows a concentration of 17.5%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are interlocked and adjusted proportionally. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 1000 kg / t, and highly stable ammonia water is obtained.

[0039] Example 4

[0040] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.3 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 170 kg / t.

[0041] (2) Maintain a water feed rate of 0.8 m³. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 20%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0042] (3) Adjust the system preparation pressure to 1.0 MPa;

[0043] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 830 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 16℃ by the secondary cooler.

[0044] (5) When the ammonia concentration detector shows a concentration of 17.5%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 1000 kg / t, and highly stable ammonia is obtained.

[0045] Example 5

[0046] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.32 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 175 kg / t.

[0047] (2) Maintain a water feed rate of 1 m³ / min. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 25%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0048] (3) Adjust the system preparation pressure to 0.95 MPa;

[0049] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 825 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 15℃ by the secondary cooler.

[0050] (5) When the ammonia concentration detector shows a concentration of 17%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 950 kg / t, and highly stable ammonia is obtained.

[0051] Example 6

[0052] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.31 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 172.5 kg / t.

[0053] (2) Maintain a water feed rate of 0.9 m³. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 22.5%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0054] (3) Adjust the system preparation pressure to 0.9 MPa;

[0055] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 820 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 14℃ by the secondary cooler.

[0056] (5) When the ammonia concentration detector shows a concentration of 18%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 1050 kg / t, and highly stable ammonia is obtained.

[0057] Example 7

[0058] (1) Add the soft water from the water softening unit to the ammonia water preparation system. The pressure of the water softening unit is 0.3 MPa. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 170 kg / t.

[0059] (2) Maintain a water feed rate of 0.8 m³. 3 / h, the ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 20%, the ammonia water transfer pump is turned on, and the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe is opened, and the soft valve is closed.

[0060] (3) Adjust the system preparation pressure to 0.9 MPa;

[0061] (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 830 kg / t. After passing through the total flow meter, it is divided into two paths, which enter the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the temperature of the ammonia solution is controlled at 16℃ by the secondary cooler.

[0062] (5) When the ammonia concentration detector shows a concentration of 17.5%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 1000 kg / t, and highly stable ammonia is obtained.

[0063] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A production process for preparing highly stable ammonia water, characterized in that, Includes the following steps: (1) Add the soft water from the water softening unit to the ammonia water preparation system. After the soft water fills the ammonia water preparation system, start the circulation pump so that the water in the ammonia water preparation system is in circulation. The water consumption is 170-175 kg / t. (2) Maintain the water feed rate. The ammonia water preparation system discharges into the ammonia water storage tank. When the ammonia water storage tank level reaches 20-25%, start the ammonia water transfer pump and open the valve on the pump outlet return ammonia water preparation circulation pump inlet pipe, and close the soft valve. (3) Adjust the system pressure; The preparation pressure in (3) is 0.9-1.0 MPa; (4) After the liquid ammonia in the liquid ammonia storage tank is cooled by cooling coal in the cooler, the liquid ammonia consumption is 820-830 kg / t. After passing through the total flow meter, it is divided into two paths and enters the primary mixer and the secondary mixer respectively. After the liquid ammonia and the ammonia solution are mixed in the primary mixer, the ammonia solution is cooled by the primary cooler and then enters the secondary mixer to mix with the liquid ammonia. After mixing, the ammonia solution is cooled by the secondary cooler. The temperature of the secondary cooler in (4) is controlled at 14-16℃; (5) When the ammonia concentration detector shows a concentration of 17-18%, immediately open the soft water valve and inject soft water into the system. The water flow rate and the liquid ammonia feed rate are adjusted in a proportional manner. At the same time, close the valve on the ammonia pump outlet return ammonia preparation circulation pump inlet pipe. The ammonia production is 950-1050 kg / t, and highly stable ammonia is obtained.

2. The production process for preparing highly stable ammonia water according to claim 1, characterized in that, The pressure of the water softening device in (1) is 0.3-0.32 MPa.

3. The production process for preparing highly stable ammonia water according to claim 1, characterized in that, The water feed rate in (2) is 0.8-1m³. 3 / h.

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