A device for simple discharge of liquid ammonia from an ice machine to a tank truck

Abstract

The utility model discloses a device is unloaded to tank car with ice machine liquid ammonia simply, including compressor, ice machine system, liquid ammonia unloading pipeline, liquid ammonia pipeline, medium pressure nitrogen pipeline and tank car, ice machine system includes anti surge cooler, liquid ammonia storage jar and power saver, compressor links to each other with anti surge cooler, and anti surge cooler links to each other with liquid ammonia storage jar, and liquid ammonia storage jar links to each other with power saver, and power saver links to each other with the ammonia cooler of low temperature methanol washing system, and the ammonia cooler of low temperature methanol washing system links to each other with compressor, be connected with liquid ammonia pipeline on liquid ammonia storage jar, and liquid ammonia pipeline links to each other with tank car, be connected with liquid ammonia unloading pipeline on power saver, and liquid ammonia unloading pipeline links to each other with liquid ammonia pipeline, and medium pressure nitrogen pipeline links to each other with liquid ammonia pipeline and tank car. Advantage is: guarantee ice machine system supplement liquid ammonia and can utilize same pipeline safely and effectively when storing liquid ammonia in system and unloading, avoid the emergence of overpressure or leakage due to preparation use temporary pipeline and cause safety accident.

Description

Technical Field

[0001] This utility model relates to the field of clean production technology, and in particular to a device for easily unloading liquid ammonia from an ice machine into a tank truck. Background Technology

[0002] In the modern coal chemical industry, liquid ammonia filling and external delivery are common in ammonia production and ammonia refrigeration processes. In ammonia refrigeration processes, some ammonia is lost during start-up, shutdown, and daily operation, necessitating periodic replenishment. Furthermore, during major system shutdowns and overhauls, the liquid ammonia stored in the ice machine system needs to be unloaded and transported out of the plant via tank trucks. However, in ammonia refrigeration ice machine systems, only liquid ammonia filling pipelines and universal loading arms are installed; liquid ammonia unloading pipelines are not. When the ice machine system requires maintenance, excess liquid ammonia needs to be unloaded to tank trucks. This can only be done by constructing temporary pipelines, which poses safety risks during construction and installation, and prevents the use of existing filling pipelines, resulting in resource waste. Utility Model Content

[0003] The purpose of this invention is to provide a device for easily unloading liquid ammonia from an ice machine into a tank truck, thereby solving the aforementioned problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An apparatus for easily unloading liquid ammonia from an ice machine to a tank truck includes a compressor, an ice machine system, a liquid ammonia unloading pipeline, a liquid ammonia pipeline, a medium-pressure nitrogen pipeline, and a tank truck. The ice machine system includes an anti-surge cooler, a liquid ammonia storage tank, and an energy-saving device. The compressor is connected to the anti-surge cooler, the anti-surge cooler is connected to the liquid ammonia storage tank, the liquid ammonia storage tank is connected to the energy-saving device, the energy-saving device is connected to the ammonia cooler of a low-temperature methanol washing system, and the ammonia cooler of the low-temperature methanol washing system is connected to the compressor. A liquid ammonia pipeline is connected to the liquid ammonia storage tank and to the tank truck. A liquid ammonia unloading pipeline is connected to the energy-saving device and to the liquid ammonia pipeline. The medium-pressure nitrogen pipeline is connected to both the liquid ammonia pipeline and the tank truck.

[0006] Preferably, the device includes two ice machine systems, namely ice machine system A and ice machine system B. Ice machine system A includes an anti-surge cooler A, an energy-saving device A, and a liquid ammonia storage tank A that maintains the liquid level at the high limit. Ice machine system B includes an anti-surge cooler B, an energy-saving device B, and a liquid ammonia storage tank B that maintains the liquid level at the low limit. The compressor is connected to the anti-surge cooler A and the anti-surge cooler B. The anti-surge cooler A and the anti-surge cooler B are respectively connected to the liquid ammonia storage tank A and the liquid ammonia storage tank B. The liquid ammonia storage tank A and the liquid ammonia storage tank B are respectively connected to the energy-saving device A and the energy-saving device B. The energy-saving device A and the energy-saving device B are respectively connected to the ammonia cooler A and the ammonia cooler B of the low-temperature methanol washing system. The ammonia cooler A and the ammonia cooler B of the low-temperature methanol washing system are connected to the compressor. The energy-saving device B is connected to the liquid ammonia discharge pipeline.

[0007] Preferably, a first switching valve is provided on the liquid ammonia pipeline, and the connection point between the liquid ammonia discharge pipeline and the liquid ammonia pipeline is located between the tank truck and the first switching valve.

[0008] Preferably, a second switching valve is provided on the liquid ammonia discharge pipeline.

[0009] Preferably, a third switching valve is provided between the liquid ammonia pipeline and the medium-pressure nitrogen pipeline.

[0010] The beneficial effects of this utility model are: 1. It ensures that the replenishment of liquid ammonia to the ice machine system and the unloading of liquid ammonia stored in the system can be carried out safely and effectively using the same pipeline, avoiding safety accidents caused by overpressure or leakage due to the use of temporary pipelines. 2. It is safe and convenient in actual operation, utilizing existing pipelines and equipment, avoiding the need for temporary pipelines, reducing manpower and material costs, improving equipment utilization, and the original filling pipeline has higher safety performance than temporary pipelines, thus improving the safety factor during operation. 3. It can unload the remaining liquid ammonia in the low-limit liquid ammonia storage tank B to a tank truck or return it to the liquid ammonia storage tank, avoiding waste of liquid ammonia and saving production costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the device in an embodiment of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0013] like Figure 1As shown, an apparatus for easily unloading liquid ammonia from an ice machine to a tank truck includes a compressor, an ice machine system, a liquid ammonia unloading pipeline, a liquid ammonia pipeline, a medium-pressure nitrogen pipeline, and a tank truck. The ice machine system includes an anti-surge cooler, a liquid ammonia storage tank, and an energy-saving device. The compressor is connected to the anti-surge cooler, the anti-surge cooler is connected to the liquid ammonia storage tank, the liquid ammonia storage tank is connected to the energy-saving device, the energy-saving device is connected to the ammonia cooler of a low-temperature methanol washing system, and the ammonia cooler of the low-temperature methanol washing system is connected to the compressor. A liquid ammonia pipeline is connected to the liquid ammonia storage tank and to the tank truck. A liquid ammonia unloading pipeline is connected to the energy-saving device and to the liquid ammonia pipeline. The medium-pressure nitrogen pipeline is connected to the liquid ammonia pipeline and the tank truck.

[0014] Specifically, the device includes two ice machine systems, namely ice machine system A and ice machine system B. Ice machine system A includes an anti-surge cooler A, an energy-saving device A, and a liquid ammonia storage tank A that maintains the high liquid level. Ice machine system B includes an anti-surge cooler B, an energy-saving device B, and a liquid ammonia storage tank B that maintains the low liquid level. The compressor is connected to the anti-surge cooler A and the anti-surge cooler B. The anti-surge cooler A and the anti-surge cooler B are respectively connected to the liquid ammonia storage tank A and the liquid ammonia storage tank B. The liquid ammonia storage tank A and the liquid ammonia storage tank B are respectively connected to the energy-saving device A and the energy-saving device B. The energy-saving device A and the energy-saving device B are respectively connected to the ammonia cooler A and the ammonia cooler B of the low-temperature methanol washing system. The ammonia cooler A and the ammonia cooler B of the low-temperature methanol washing system are connected to the compressor. The energy-saving device B is connected to the liquid ammonia discharge pipeline.

[0015] In this embodiment, a first switching valve is installed on the liquid ammonia pipeline, and the connection point between the liquid ammonia discharge pipeline and the liquid ammonia pipeline is located between the tank truck and the first switching valve. A second switching valve is installed on the liquid ammonia discharge pipeline. A third switching valve is installed between the liquid ammonia pipeline and the medium-pressure nitrogen pipeline.

[0016] In this embodiment, the ice machine system provides cooling capacity to the low-temperature methanol washing system during normal production. Liquid ammonia in the liquid ammonia storage tank is sent to ammonia coolers A and B of the low-temperature methanol washing system through power saver A and power saver B. Then, the gaseous ammonia coming out of ammonia coolers A and B is compressed by a compressor and cooled by anti-surge coolers A and B. The liquid ammonia is then stored in liquid ammonia storage tanks A and B. This process is continuously repeated, providing a continuous supply of cooling capacity to the low-temperature methanol washing system.

[0017] When the liquid ammonia in the ice machine system needs to be replenished due to natural loss, the first switch valve is opened and the second and third switch valves are closed. The liquid ammonia in the tanker in the tanker filling area is pressurized into liquid ammonia storage tanks A and B using the medium-pressure nitrogen pipeline and the liquid ammonia pipeline. During filling, the liquid ammonia in the tanker is delivered to liquid ammonia storage tanks A and B in the ice machine system through the pressure difference between the medium-pressure nitrogen (about 1.7 MPa) and liquid ammonia storage tanks A and B (about 1.1 MPa).

[0018] When the ice machine system is shut down for maintenance, the liquid ammonia stored in the system needs to be unloaded into a tanker truck. Since the original liquid ammonia pipeline could only be filled and not unloaded, the device design adds a liquid ammonia unloading pipeline at the bottom of the energy-saving device B. When liquid ammonia needs to be unloaded from the liquid ammonia storage tank B of the ice machine system, the tanker truck stops at the tanker truck filling area and connects the pipeline. The newly added liquid ammonia unloading pipeline at the bottom of the energy-saving device B is connected to the liquid ammonia pipeline. The first switch valve is closed and the second and third switch valves are opened. By pressurizing the liquid ammonia storage tank B, the liquid ammonia is pressed to the energy-saving device B using the pressure difference. Then, the liquid ammonia stored in the ice machine system is sent to the tanker truck through the liquid ammonia unloading pipeline and the liquid ammonia pipeline.

[0019] In this embodiment, compared with the original operation, the device significantly reduces the waste of liquid ammonia. The original operation involved controlling the liquid ammonia storage tanks of two refrigeration systems, maintaining one at the high limit and the other at the low limit. Excess liquid ammonia was stored as much as possible in the ammonia cooler of the cryogenic methanol washing system, while the liquid ammonia in the low-limit storage tank B needed to be completely drained and burned through a flare. Compared with the original operation, the device can unload the remaining liquid ammonia in the low-limit storage tank B to a tank truck or return it to the liquid ammonia storage tank, avoiding waste and saving production costs.

[0020] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0021] This invention provides a device for easily unloading liquid ammonia from an ice machine to a tank truck. It ensures that both replenishing and unloading stored liquid ammonia from the ice machine system can be done safely and efficiently using the same pipeline, avoiding safety accidents caused by overpressure or leakage due to the use of temporary pipelines. In practical operation, it is safe and convenient, utilizing existing pipelines and equipment, avoiding the need for temporary pipelines, reducing manpower and material costs, and improving equipment utilization. The original filling pipeline has higher safety performance than temporary pipelines, enhancing the safety factor during operation. It can also unload remaining liquid ammonia in the low-level liquid ammonia storage tank B to a tank truck or return it to the liquid ammonia storage tank, avoiding waste of liquid ammonia and saving production costs.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for easily unloading liquid ammonia from an ice machine into a tank truck, characterized in that: The system includes a compressor, an ice machine system, a liquid ammonia discharge pipeline, a liquid ammonia pipeline, a medium-pressure nitrogen pipeline, and a tank truck. The ice machine system includes an anti-surge cooler, a liquid ammonia storage tank, and an energy-saving device. The compressor is connected to the anti-surge cooler, the anti-surge cooler is connected to the liquid ammonia storage tank, the liquid ammonia storage tank is connected to the energy-saving device, the energy-saving device is connected to the ammonia cooler of the low-temperature methanol washing system, and the ammonia cooler of the low-temperature methanol washing system is connected to the compressor. A liquid ammonia pipeline is connected to the liquid ammonia storage tank, the liquid ammonia pipeline is connected to the tank truck, the energy-saving device is connected to the liquid ammonia discharge pipeline, the liquid ammonia discharge pipeline is connected to the liquid ammonia pipeline, and the medium-pressure nitrogen pipeline is connected to the liquid ammonia pipeline and the tank truck.

2. The device for simply unloading liquid ammonia from an ice machine into a tank truck according to claim 1, characterized in that: The device includes two icing systems, namely icing system A and icing system B. Icy system A includes an anti-surge cooler A, an energy-saving device A, and a liquid ammonia storage tank A that maintains the liquid level at the high limit. Icy system B includes an anti-surge cooler B, an energy-saving device B, and a liquid ammonia storage tank B that maintains the liquid level at the low limit. The compressor is connected to the anti-surge cooler A and the anti-surge cooler B. The anti-surge cooler A and the anti-surge cooler B are respectively connected to the liquid ammonia storage tank A and the liquid ammonia storage tank B. The liquid ammonia storage tank A and the liquid ammonia storage tank B are respectively connected to the energy-saving device A and the energy-saving device B. The energy-saving device A and the energy-saving device B are respectively connected to the ammonia cooler A and the ammonia cooler B of the low-temperature methanol washing system. The ammonia cooler A and the ammonia cooler B of the low-temperature methanol washing system are connected to the compressor. The energy-saving device B is connected to the liquid ammonia discharge pipeline.

3. The device for simply unloading liquid ammonia from an ice machine into a tank truck according to claim 2, characterized in that: A first switching valve is installed on the liquid ammonia pipeline, and the connection point between the liquid ammonia discharge pipeline and the liquid ammonia pipeline is located between the tank truck and the first switching valve.

4. The device for simply unloading liquid ammonia from an ice machine into a tank truck according to claim 2, characterized in that: A second switching valve is installed on the liquid ammonia discharge pipeline.

5. The apparatus for simply unloading liquid ammonia from an ice machine into a tank truck according to claim 2, characterized in that: A third switching valve is installed between the liquid ammonia pipeline and the medium-pressure nitrogen pipeline.

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