Ammonia distribution system for preventing ammonia escape in power plant

Abstract

The utility model relates to the technical field of ammonia preparation systems, in particular to an ammonia preparation system for preventing ammonia escape in a power plant, which comprises a dissolving tank, the top and the bottom of the dissolving tank are connected with two ends of a circulating pipe, and a circulating pump is arranged on the circulating pipe; the top of the dissolving tank is connected with a dilution water tank through a communicating pipe, the bottom of the dilution water tank is connected with a circulating pipe through a return pipe, and valves are arranged on the communicating pipe, the circulating pipe and the return pipe; a breather valve mounting pipe is arranged on the dilution water tank, a breather valve is mounted on the breather valve mounting pipe, the communicating pipe is connected with the breather valve mounting pipe through a bypass pipe, and a shut-off valve is arranged on the bypass pipe; by arranging the dilution water tank, ammonia gas in the dilution water tank can be released into the dilution water tank to react with water to form ammonia water when the pressure in the dissolving tank is large, so that the ammonia gas is prevented from overflowing.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia distribution systems, in particular to an ammonia distribution system for preventing ammonia from escaping in a power plant. Background Art

[0002] During the operation of a thermal power plant, an ammonia distribution system is used to add ammonia to the feed water to increase the pH value and slow down the corrosion of the water vapor system. When ammonia enters the ammonia distribution dissolution tank, some of the ammonia cannot react completely, which increases the pressure in the dissolution tank and the manhole cover on the top of the dissolution tank rises. The water seal at the manhole is too small to absorb the overflowing ammonia, resulting in ammonia overflow. When the ammonia delivery pump is running to pump liquid out, a negative pressure is formed inside the dissolution tank, and the water at the manhole cover will be sucked into the dissolution tank. The water seal disappears, and the ammonia will overflow again, causing unsafe situations such as poisoning and explosion. Utility Model Content

[0003] The main purpose of the utility model is to provide an ammonia preparation system for a power plant that prevents ammonia from escaping, so as to solve the problem of ammonia overflow and unsafety in the ammonia preparation system in the above-mentioned prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides an ammonia distribution system for preventing ammonia escape in a power plant, comprising a dissolution box, the top and bottom of which are connected to the two ends of a circulation pipe, and a circulation pump is provided on the circulation pipe; the top of the dissolution box is connected to a dilution water tank through a connecting pipe, and the bottom of the dilution water tank is connected to the circulation pipe through a return pipe, and valves are provided on the connecting pipe, the circulation pipe and the return pipe.

[0005] Furthermore, a breathing valve installation pipe is provided on the dilution water tank, a breathing valve is installed on the breathing valve installation pipe, the connecting pipe is connected to the breathing valve installation pipe through a bypass pipe, and a shut-off valve is provided on the bypass pipe.

[0006] Furthermore, a manhole and a stirrer for stirring the inside of the dissolution box are installed on the dissolution box.

[0007] Furthermore, the dissolution tank and the dilution water tank are connected to a water inlet pipe; the dissolution tank is connected to an ammonia inlet pipe, the circulation pipe is connected to a drainage pipe, and valves are provided on the water inlet pipe, the ammonia inlet pipe and the drainage pipe.

[0008] The utility model provides a dilution water tank, which can release the ammonia in the dilution water tank into the dilution water tank to react with water to form ammonia water when the pressure in the dissolution tank is high, thereby avoiding ammonia overflow; by connecting the connecting pipe and the breathing valve installation pipe, the dissolution box and the connecting pipe can share the breathing valve, thereby achieving full utilization of the connecting pipe and saving costs, and the breathing valve can avoid the influence of negative pressure on the dissolution box.

[0009] The utility model can accelerate the reaction of ammonia and water by arranging a stirrer. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0011] Figure 1 Schematic diagram of the structure of an ammonia distribution system for preventing ammonia escape in a power plant in an embodiment;

[0012] In the figure: 1. Dissolution tank; 2. Connecting pipe; 3. Dilution water tank; 301. Breathing valve installation pipe; 4. Circulation pipe; 5. Return pipe; 6. Circulation pump; 7. Breathing valve; 8. Bypass pipe; 9. Agitator; 10. Manhole; 11. Drain pipe; 12. Water inlet pipe; 13. Ammonia inlet pipe; 14. Shut-off valve. DETAILED DESCRIPTION

[0013] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0014] like Figure 1 As shown, according to an embodiment of the present invention, an ammonia distribution system for preventing ammonia from escaping in a power plant is provided, comprising a dissolution tank 1, the top and bottom of the dissolution tank 1 being connected to both ends of a circulation pipe 4, and a circulation pump 6 being provided on the circulation pipe 4; the top of the dissolution tank 1 is connected to a dilution water tank 3 through a connecting pipe 2, and the connecting pipe 2 extends into the bottom of the dilution water tank 3; the bottom of the dilution water tank 3 is connected to the circulation pipe 4 through a return pipe 5, and valves are provided on the connecting pipe 2, the circulation pipe 4 and the return pipe 5.

[0015] The dilution water tank 3 is provided with a breathing valve installation pipe 301 , on which a breathing valve 7 is installed. The connecting pipe 2 is connected to the breathing valve installation pipe 301 through a bypass pipe 8 , on which a shut-off valve 14 is provided.

[0016] The dissolution tank 1 is provided with a manhole 10 and a stirrer 9 for stirring the interior of the dissolution tank 1 .

[0017] The dissolution tank 1 and the dilution water tank 3 are connected to a water inlet pipe 12; the dissolution tank 1 is connected to an ammonia inlet pipe 13, which extends into the bottom of the dissolution tank 1; the circulation pipe 4 is connected to a drainage pipe 11, and valves are provided on the water inlet pipe 12, the ammonia inlet pipe 13 and the drainage pipe 11.

[0018] The working principle of the above embodiment is:

[0019] First, add a certain amount of water into the dissolution tank 1 and the dilution water tank 3 so that the water level is above the bottom of the ammonia inlet pipe 13 and the connecting pipe 2;

[0020] Then, ammonia gas is introduced into the dissolution tank 1; most of the ammonia gas reacts with the water in the dissolution tank 1 to form ammonia water, and some ammonia gas that cannot react completely enters the dilution water tank 3 through the connecting pipe 2 to react with water to form ammonia water; the valve on the reflux pipe 5 is opened regularly to allow the saturated ammonia water in the dilution water tank 3 to flow back to the circulation pipe 4 through the reflux pipe 5; when the valve on the reflux pipe 5 is opened, the valve on the connecting pipe 2 is closed; after the saturated ammonia water in the dilution water tank 3 is discharged and new water is added, the valve on the reflux pipe 5 is closed and the valve on the connecting pipe 2 is opened;

[0021] Finally, after the ammonia water in the dissolution tank 1 is prepared, it is discharged through the drainage pipe 11; when the ammonia water is discharged, a negative pressure is formed in the dissolution tank 1, and the shut-off valve 14 is opened at this time. The breathing valve 7 automatically opens under the action of the negative pressure, and the external gas enters the dissolution tank 1 through the bypass pipe 8 and the connecting pipe 2, eliminating the influence of the negative pressure; when the dissolution tank 1 is in a non-negative pressure state, the shut-off valve 14 remains closed.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An ammonia dispensing system for preventing ammonia from escaping in a power plant, comprising a dissolution tank (1), the top and bottom of the dissolution tank (1) being connected to two ends of a circulation pipe (4), and a circulation pump (6) being provided on the circulation pipe (4); characterized in that: The top of the dissolution tank (1) is connected to a dilution water tank (3) via a connecting pipe (2), and the bottom of the dilution water tank (3) is connected to a circulation pipe (4) via a return pipe (5). Valves are provided on the connecting pipe (2), the circulation pipe (4) and the return pipe (5).

2. The ammonia dispensing system for preventing ammonia escape in a power plant according to claim 1, characterized in that: The dilution water tank (3) is provided with a breathing valve installation pipe (301), a breathing valve (7) is installed on the breathing valve installation pipe (301), the connecting pipe (2) is connected to the breathing valve installation pipe (301) via a bypass pipe (8), and a shut-off valve (14) is provided on the bypass pipe (8).

3. The ammonia dispensing system for preventing ammonia escape for a power plant according to claim 1, characterized in that: The dissolution box (1) is provided with a manhole (10) and a stirrer (9) for stirring the interior of the dissolution box (1).

4. The ammonia dispensing system for preventing ammonia escape in a power plant according to claim 1, characterized in that: The dissolution tank (1) and the dilution water tank (3) are connected to a water inlet pipe (12); the dissolution tank (1) is connected to an ammonia inlet pipe (13); the circulation pipe (4) is connected to a drainage pipe (11); and valves are provided on the water inlet pipe (12), the ammonia inlet pipe (13), and the drainage pipe (11).

Images