Improved device for recovering liquid ammonia of first-section separator of ammonia ice machine

Abstract

The utility model relates to the technical field of coal chemical industry and power generation production, in particular to an improved device for recovering liquid ammonia of a first-section separator of an ammonia ice machine, which comprises a first-section inlet separator of an ammonia compressor and a plurality of conveying pipelines, and the output end of the first-section inlet separator of the ammonia compressor is connected with a liquid ammonia collecting tank through a first conveying pipeline. A liquid ammonia conveying regulating valve group is mounted on the first conveying pipeline, the output end of the liquid ammonia collecting tank is connected to an inlet separator at the first section of the ammonia compressor through a second conveying pipeline, and a first gaseous ammonia conveying pressure regulating valve group is mounted on the second conveying pipeline; compared with the prior art, the utility model solves the problems of reduction, gas ammonia pressure fluctuation and prolonged driving time caused by high liquid level of the separator after the ammonia compressor carries ammonia by adding the pipeline and the regulating valve; and two shield pumps with 15Kw motors are omitted, so that the aims of saving energy and reducing cost are fulfilled, and good economic benefits are realized.

Description

Technical Field

[0001] The utility model relates to the technical fields of coal chemical industry and power generation production, in particular to an improved device for recovering liquid ammonia from the first-stage separator of an ammonia ice machine. Background Technique

[0002] According to the requirements of coal chemical industry and power generation processes, during the low-temperature methanol washing and temperature reduction period when the ammonia compressor starts up the system and when major fluctuations occur in the process, the phenomenon of gaseous ammonia carrying liquid ammonia will occur. On the one hand, carrying liquid ammonia will increase the difficulty of regulating the distorted liquid level of the ammonia cooler in the low-temperature methanol washing, and on the other hand, it will cause the inlet gas of the ammonia compressor to carry liquid. If the liquid discharged from the first-stage inlet separator of the ammonia compressor to the liquid ammonia collection tank is not timely, it will seriously cause the ammonia compressor to trip or damage the rotor of the ammonia compressor.

[0003] The original liquid ammonia recovery device was designed and configured with two low-temperature liquid ammonia canned pumps to pump the liquid ammonia discharged from the first-stage inlet separator of the ammonia compressor into the liquid ammonia collection tank, and send it out under pressure to the liquid ammonia buffer tank of the ammonia compressor for recycling. Since there is no liquid ammonia at the inlet of the liquid ammonia canned pump usually and it cannot be precooled to be in a standby state, the operation is difficult and time-consuming. There is a problem that when a large amount of liquid is carried by the ammonia compressor, it cannot be started in time to pump it away, resulting in the ammonia compressor being forced to reduce the load to reduce the liquid-carrying amount to ensure the safe operation of the unit and affect production. In addition, it will also cause fluctuations in the gaseous ammonia pressure of all ammonia coolers, affecting the entire system. For this reason, the utility model proposes an improved device for recovering liquid ammonia from the first-stage separator of an ammonia ice machine. Content of the Utility Model

[0004] The purpose of the utility model is to provide an improved device for recovering liquid ammonia from the first-stage separator of an ammonia ice machine to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: An improved device for recovering liquid ammonia from the first-stage separator of an ammonia ice machine, including the first-stage inlet separator of the ammonia compressor and multiple conveying pipelines. The output end of the first-stage inlet separator of the ammonia compressor is connected to a liquid ammonia collection tank through a first conveying pipeline, and a liquid ammonia conveying regulating valve group is installed on the first conveying pipeline. The output end of the liquid ammonia collection tank is connected to the first-stage inlet separator of the ammonia compressor through a second conveying pipeline, and a first gaseous ammonia conveying pressure regulating valve group is installed on the second conveying pipeline. The liquid ammonia collection tank is connected to the third-stage inlet separator of the ammonia compressor through a third output pipeline, and a second gaseous ammonia conveying pressure regulating valve group is installed on the third output pipeline. The liquid ammonia collection tank is also connected to the inlet buffer tank of the combined ammonia cooler through a fourth conveying pipeline, and a liquid discharge regulating valve group is installed on the fourth conveying pipeline.

[0006] As a preferred technical scheme of the utility model, the inlet buffer tank of the combined ammonia cooler is connected to a liquid ammonia combined ammonia cooler through a fifth conveying pipeline.

[0007] As a preferred technical solution of the present utility model, the output end of the combined ammonia cooler inlet buffer tank is connected to the inlet of the second stage of the ammonia compressor.

[0008] As a preferred technical solution of the present utility model, a sixth conveying pipeline is installed at the input end of the inlet separator of the first stage of the ammonia compressor, and low-temperature methanol washing is provided in the sixth conveying pipeline.

[0009] As a preferred technical solution of the present utility model, the liquid ammonia conveying regulating valve group, the first gaseous ammonia conveying pressure regulating valve group, the second gaseous ammonia conveying pressure regulating valve group, and the liquid discharge regulating valve group all include a plurality of automatic regulating valves, and the automatic regulating valves are all electrically connected to the DCS system.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] The improved device for recovering liquid ammonia from the separator of the first stage of the ammonia ice machine of the present utility model, by adding a pipeline from the liquid ammonia collection tank to the inlet buffer of the combined ammonia cooler for ammonia synthesis and an automatic regulating valve group, and adding an automatic regulating valve group for gas and liquid phase pipelines on the connecting pipeline between the inlet separator of the first stage of the ammonia compressor and the liquid ammonia collection tank. At the same time, a gas phase pipeline and an automatic regulating valve group are added from the inlet separator of the third stage of the ammonia compressor to the liquid ammonia collection tank. By adding pipelines and regulating valves, the problems of high liquid level in the separator after the ammonia compressor is carried with ammonia, resulting in production reduction, gas ammonia pressure fluctuation, and extended start-up time are solved; two 15Kw canned motor pumps are saved, achieving the goals of energy conservation and cost reduction, and realizing good economic benefits.

[0012] The present utility model can make full use of the process principles of separation, pressurization, recovery, and evaporation, thereby solving the problems of high liquid level in the separator after the ammonia compressor is carried with liquid ammonia, resulting in production reduction, gas ammonia pressure fluctuation, and extended start-up time; two 15Kw canned motor pumps for liquid ammonia conveying are saved, achieving the goals of energy conservation and cost reduction, and realizing good economic benefits. At the same time, remote DCS central control microcomputer automatic adjustment operation control is realized. The automatic operation level and production efficiency of the aerospace furnace device are improved.

[0013] Other features and advantages of the present utility model will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0015] In the figure: 1. Inlet separator of the first stage of ammonia compressor; 2. Liquid ammonia collection tank; 3. Inlet separator of the third stage of ammonia compressor; 4. Inlet buffer tank of combined ammonia cooler; 5. Combined liquid ammonia cooler; 6. Liquid ammonia transfer regulating valve group; 7. First gaseous ammonia transfer pressure regulating valve group; 8. Second gaseous ammonia transfer pressure regulating valve group; 9. Drainage regulating valve group. Detailed implementation manners

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0018] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0019] Please refer to Figure 1, in this embodiment, an improved device for recycling liquid ammonia from the first-stage separator of an ammonia ice machine is provided, which includes a first-stage inlet separator 1 of an ammonia compressor and a plurality of conveying pipelines. The output end of the first-stage inlet separator 1 of the ammonia compressor is connected to a liquid ammonia collection tank 2 through a first conveying pipeline, and a liquid ammonia conveying regulating valve group 6 is installed on the first conveying pipeline. The output end of the liquid ammonia collection tank 2 is connected to the first-stage inlet separator 1 of the ammonia compressor through a second conveying pipeline, and a first gaseous ammonia conveying pressure regulating valve group 7 is installed on the second conveying pipeline. The liquid ammonia collection tank 2 is connected to a third-stage inlet separator 3 of the ammonia compressor through a third output pipeline, and a second gaseous ammonia conveying pressure regulating valve group 8 is installed on the third output pipeline. The liquid ammonia collection tank 2 is also connected to an inlet buffer tank 4 of a combined ammonia cooler through a fourth conveying pipeline, and a liquid discharge regulating valve group 9 is installed on the fourth conveying pipeline. The inlet buffer tank 4 of the combined ammonia cooler is connected to a liquid ammonia combined ammonia cooler 5 through a fifth conveying pipeline, and the output end of the inlet buffer tank 4 of the combined ammonia cooler is connected to the second-stage inlet of the ammonia compressor. The input end of the first-stage inlet separator 1 of the ammonia compressor is provided with a sixth conveying pipeline, and low-temperature methanol washing is provided in the sixth conveying pipeline. The liquid ammonia conveying regulating valve group 6, the first gaseous ammonia conveying pressure regulating valve group 7, the second gaseous ammonia conveying pressure regulating valve group 8, and the liquid discharge regulating valve group 9 all include a plurality of automatic regulating valves, and the automatic regulating valves are all electrically connected to the DCS system.

[0020] In this embodiment, after it is found that the first-stage inlet separator 1 of the ammonia compressor is carrying liquid ammonia, the liquid ammonia is first discharged into the liquid ammonia collection tank 2 of the ammonia compressor to ensure that the separated liquid ammonia in the inlet separator can be discharged in time. When external discharge is required, the liquid ammonia conveying regulating valve group 6 and the first gaseous ammonia conveying pressure regulating valve group 7 on the connecting pipeline are closed, the pipeline between the liquid ammonia collection tank 2 and the first-stage inlet separator 1 of the ammonia compressor is cut off, and the second gaseous ammonia conveying pressure regulating valve group 8 of the third-stage separator (3) of the ammonia compressor is opened to discharge the gaseous ammonia with higher pressure and temperature into the liquid ammonia collection tank 2 to increase the pressure in the tank to 0.3 - 0.4 MPa. The liquid discharge regulating valve group 9 from the liquid ammonia collection tank 2 to the inlet buffer tank 4 of the combined ammonia cooler is opened to discharge the liquid ammonia into the secondary ammonia cooling of the combined ammonia cooler 5 for direct evaporation refrigeration use. After the liquid ammonia in the liquid ammonia collection tank 2 is drained, the valve positions of the automatic regulating valve group are restored, and the liquid ammonia separated by the first-stage inlet separator 1 of the ammonia compressor can continue to be externally discharged to ensure the safe operation of the ammonia compressor.

[0021] In this embodiment, by adding pipelines and regulating valves, the problems of high liquid level in the separator after the ammonia compressor is carrying ammonia, resulting in reduced production, fluctuating gaseous ammonia pressure, and extended startup time, are solved; two 15Kw canned motor pumps are saved, achieving the goals of energy conservation and cost reduction, realizing good economic benefits, and at the same time realizing remote DCS central control microcomputer automatic adjustment operation control, improving the automatic operation level and production efficiency of the space furnace device.

[0022] The utility model has a simple structure, is convenient to install and use, and fully utilizes the technological principles of separation, pressurization, recovery, and evaporation. Thus, it can solve the problems that the liquid ammonia separator level is high after the ammonia compressor is with liquid ammonia, resulting in reduced production, fluctuating gas ammonia pressure, and extended start-up time; two 15Kw liquid ammonia transfer canned motor pumps are saved, achieving the goals of energy conservation and cost reduction, realizing good economic benefits, and at the same time realizing remote DCS central control microcomputer automatic adjustment operation control, improving the automatic operation level and production efficiency of the aerospace furnace device.

[0023] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An improved device for recycling liquid ammonia from the first-stage separator of an ammonia ice machine, characterized in that, It includes the inlet separator (1) of the first stage of the ammonia compressor and multiple conveying pipelines. The output end of the inlet separator (1) of the first stage of the ammonia compressor is connected to the liquid ammonia collection tank (2) through the first conveying pipeline, and a liquid ammonia conveying regulating valve group (6) is installed on the first conveying pipeline. The output end of the liquid ammonia collection tank (2) is connected to the inlet separator (1) of the first stage of the ammonia compressor through the second conveying pipeline, and a first gaseous ammonia conveying pressure regulating valve group (7) is installed on the second conveying pipeline. The liquid ammonia collection tank (2) is connected to the inlet separator (3) of the third stage of the ammonia compressor through the third output pipeline, and a second gaseous ammonia conveying pressure regulating valve group (8) is installed on the third output pipeline. The liquid ammonia collection tank (2) is also connected to the inlet buffer tank (4) of the combined ammonia cooler through the fourth conveying pipeline, and a liquid discharging regulating valve group (9) is installed on the fourth conveying pipeline.

2. An improved device for recovering liquid ammonia from the first-stage separator of an ammonia ice machine according to claim 1, characterized in that, The inlet buffer tank (4) of the combined ammonia cooler is connected to the liquid ammonia combined ammonia cooler (5) through the fifth conveying pipeline.

3. An improved device for recycling liquid ammonia in the first-stage separator of an ammonia ice machine according to claim 1, characterized in that, The output end of the inlet buffer tank (4) of the combined ammonia cooler is connected to the inlet of the second stage of the ammonia compressor.

4. An improved device for recycling liquid ammonia in the first-stage separator of an ammonia ice machine according to claim 1, characterized in that, The input end of the inlet separator (1) of the first stage of the ammonia compressor is installed with a sixth conveying pipeline, and low-temperature methanol washing is provided in the sixth conveying pipeline.

5. An improved device for recovering liquid ammonia from the first-stage separator of an ammonia ice machine according to claim 1, characterized in that, The liquid ammonia conveying regulating valve group (6), the first gaseous ammonia conveying pressure regulating valve group (7), the second gaseous ammonia conveying pressure regulating valve group (8), and the liquid discharging regulating valve group (9) all include multiple automatic regulating valves, and the automatic regulating valves are all electrically connected to the DCS system.

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