A liquid ammonia evaporation device

Abstract

This utility model relates to a liquid ammonia evaporation device, comprising a shell with heat exchange tubes containing a heat exchanger, a liquid ammonia inlet pipe and a drain pipe connected to the bottom of the shell, and an ammonia outlet pipe connected to the top of the shell. Inside the shell, an anti-impact baffle is installed above the liquid ammonia inlet pipe, and a wire mesh demister is installed below the ammonia outlet pipe. A level gauge and a first thermometer are also connected to the end of the shell. This liquid ammonia evaporation device effectively improves evaporation capacity and increases the purity of ammonia.

Description

Technical Field

[0001] This utility model relates to a liquid ammonia evaporation device, and relates to the field of liquid ammonia evaporation technology. Background Technology

[0002] Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong, pungent odor. As an important chemical raw material, it is usually produced by liquefying gaseous ammonia through pressurization or cooling for ease of transportation and storage. Liquid ammonia is readily soluble in water, forming ammonium ions (NH4+) upon dissolution. + ) and hydroxide ions (OH) - Liquid ammonia, due to its corrosive and volatile properties, has a high rate of chemical accidents. For storage, liquid ammonia is typically stored in pressure-resistant steel cylinders or tanks and cannot coexist with substances such as acetaldehyde, acrolein, or boron. In industrial applications, the vaporization (evaporation) of liquid ammonia often uses a water bath heating method: a stainless steel coil containing liquid ammonia is immersed in warm water, and the ammonia absorbs heat from the warm water through the coil wall, vaporizing and becoming superheated. The vaporized ammonia then passes through a gas-liquid separator to remove oil before proceeding to the next process. However, given the special nature of liquid ammonia, which cannot come into contact with water, this water bath heating method is extremely dangerous, and the purity of the collected ammonia gas is often low.

[0003] To address the above technical issues, this paper proposes a liquid ammonia evaporation device. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a liquid ammonia evaporation device.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a liquid ammonia evaporation device, including a shell with a heat exchange tube having a heat exchanger inside, a liquid ammonia inlet pipe and a drain pipe connected to the bottom of the shell, and an ammonia outlet pipe connected to the top of the shell, an anti-impact baffle plate being provided above the liquid ammonia inlet pipe and a wire mesh demister being provided below the ammonia outlet pipe inside the shell, and a level gauge and a first thermometer being connected to the end of the shell.

[0006] Preferably, the heat exchanger is fixedly connected to the end of the shell, and is provided with a heat medium inlet pipe and a heat medium outlet pipe. The inlet end of the heat exchange tube is connected to the heat medium inlet pipe, and the outlet end of the heat exchange tube is connected to the heat medium outlet pipe.

[0007] Preferably, the heat exchange tube has a U-shaped structure and has several tubes.

[0008] Preferably, the anti-impact baffle is a horizontal flat plate and is fixedly connected to the lower middle region inside the housing.

[0009] Preferably, a second thermometer is connected to the drain pipe to detect the drain temperature.

[0010] Preferably, a vertical anti-impact plate is fixedly connected inside the housing to the front side of the level gauge and the first thermometer.

[0011] Preferably, the top of the housing is connected to a safety valve port and a spare port, the safety valve port being used to connect an external safety valve.

[0012] Preferably, the heat transfer medium used in the heat exchanger is ethylene glycol.

[0013] Preferably, the housing is provided with a level gauge mounting port and a first thermometer mounting port.

[0014] Preferably, the drain pipe is provided with a second thermometer mounting port.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The heat medium enters the heat medium inlet area of ​​the heat exchanger through the heat medium inlet pipe, then flows back to the heat medium outlet area of ​​the heat exchanger through the heat exchange tubes, and then flows out through the heat medium outlet pipe; liquid ammonia enters through the liquid ammonia inlet pipe, and after the action of the anti-impact baffle, the liquid ammonia fluid impact velocity is reduced and it is introduced into the shell smoothly. The fluid evaporates through the heat exchange tubes, and the vaporized ammonia gas is discharged through the ammonia gas outlet pipe after being demisted by the wire mesh demister.

[0017] 2. The addition of an anti-impact baffle at the liquid ammonia inlet eliminates high-speed impacts, disperses and reduces flow velocity, and guides the liquid flow direction. The baffle significantly reduces overall disturbance and forced mixing of the liquid within the container. Newly added liquid ammonia is gently introduced into the bottom region, reducing disturbance to the upper liquid layer. In a calm liquid environment, the diffusion rate of some soluble impurities into the gas phase is also relatively low. Vigorous agitation increases the gas-liquid contact area and interface renewal rate, accelerating the volatilization of these impurities (although water has high solubility in liquid ammonia, excessive agitation theoretically increases its tendency to migrate into the gas phase). Therefore, by minimizing disturbance, the anti-impact baffle effectively reduces the amount of impurities entering the ammonia gas.

[0018] The liquid ammonia evaporation device of this invention effectively improves the evaporation processing capacity and increases the purity of ammonia gas.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0021] In the diagram: 1. Heat exchange tube; 2. Shell; 3. Liquid ammonia inlet pipe; 4. Drain pipe; 5. Ammonia outlet pipe; 6. Anti-impact baffle; 7. Wire mesh demister; 8. Level gauge mounting port; 9. First thermometer mounting port; 10. Heat medium inlet pipe; 11. Heat medium outlet pipe; 12. Second thermometer mounting port; 13. Anti-impact vertical plate; 14. Safety valve port; 15. Spare port. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] like Figure 1 As shown, this embodiment provides a liquid ammonia evaporation device, including a shell 2 with a heat exchange tube 1 internally equipped with a heat exchanger. The bottom of the shell is connected to a liquid ammonia inlet pipe 3 and a drain pipe 4, and the top is connected to an ammonia outlet pipe 5. Inside the shell, an anti-impact baffle 6 is provided above the liquid ammonia inlet pipe, and a wire mesh demister 7 is provided below the ammonia outlet pipe. A level gauge and a first thermometer are also connected to the end side of the shell.

[0026] The level gauge detects the liquid ammonia level inside, and the first thermometer detects the temperature of the liquid ammonia inside.

[0027] In this embodiment of the utility model, the heat exchanger is fixedly connected to the end of the shell, and a heat medium inlet pipe 10 and a heat medium outlet pipe 11 are provided thereon. The inlet end of the heat exchange tube is connected to the heat medium inlet pipe, and the outlet end of the heat exchange tube is connected to the heat medium outlet pipe.

[0028] In this embodiment of the invention, the heat exchange tube has a U-shaped structure and has several tubes.

[0029] In this embodiment of the invention, the anti-impact baffle is a horizontal flat plate and is fixedly connected to the lower middle region inside the housing.

[0030] In this embodiment of the invention, a second thermometer is connected to the drain pipe to detect the drain temperature.

[0031] In this embodiment of the invention, a vertical anti-impact plate 13 is fixedly connected inside the housing to the front side of the level gauge and the first thermometer. The anti-impact plate "shields" the temperature sensing element in a relatively calm liquid phase region, greatly reducing its chance of contact with superheated vapor and reducing interference caused by bubbles adhering to and bursting on the element surface. This helps ensure that the first thermometer measures a temperature closer to the true and stable liquid phase saturation temperature. In addition, the anti-impact plate significantly reduces the fluid impact force and vibration risk directly borne by the temperature sensing element, thereby extending the service life of the components.

[0032] In this embodiment of the utility model, the top of the housing is connected to a safety valve port 14 and a spare port 15, and the safety valve port is used to connect an external safety valve.

[0033] In this embodiment of the invention, the heat exchanger uses ethylene glycol as the heat transfer medium.

[0034] In this embodiment of the utility model, the housing is provided with a level gauge mounting port 8 and a first thermometer mounting port 9.

[0035] In this embodiment of the utility model, a second thermometer mounting port 12 is provided on the drain pipe.

[0036] In this embodiment of the invention, the working principle of the liquid ammonia evaporation device is as follows: the heat medium ethylene glycol enters the heat medium inlet area of ​​the heat exchanger through the heat medium inlet pipe, then flows back to the heat medium outlet area of ​​the heat exchanger through the heat exchange tube, and then flows out through the heat medium outlet pipe; liquid ammonia enters through the liquid ammonia inlet pipe, and after the action of the anti-impact baffle, the liquid ammonia fluid impact velocity is reduced and it is introduced into the shell smoothly. The fluid evaporates through the heat exchange tube, and the vaporized ammonia gas is discharged through the ammonia gas outlet pipe after being demisted by the wire mesh demister.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A liquid ammonia evaporation apparatus characterized by comprising: The housing includes a heat exchange tube with an internal heat exchanger. The bottom of the housing is connected to a liquid ammonia inlet pipe and a drain pipe, and the top is connected to an ammonia outlet pipe. Inside the housing, an anti-impact baffle is installed above the liquid ammonia inlet pipe, and a wire mesh demister is installed below the ammonia outlet pipe. A level gauge and a first thermometer are also connected to the end of the housing.

2. The liquid ammonia evaporation apparatus of claim 1, wherein: The heat exchanger is fixedly connected to the end of the shell, and is provided with a heat medium inlet pipe and a heat medium outlet pipe. The inlet end of the heat exchange tube is connected to the heat medium inlet pipe, and the outlet end of the heat exchange tube is connected to the heat medium outlet pipe.

3. The liquid ammonia evaporation apparatus of claim 1, wherein: The heat exchange tubes have a U-shaped structure and consist of several tubes.

4. The liquid ammonia evaporation apparatus of claim 1, wherein: The anti-impact baffle is a horizontal flat plate and is fixedly connected to the lower middle area inside the housing.

5. The liquid ammonia vaporization apparatus of claim 1, wherein: A second thermometer is connected to the drain pipe to detect the drain temperature.

6. The liquid ammonia evaporation apparatus of claim 1, wherein: Inside the housing, a vertical anti-impact plate is fixedly connected to the front side of the level gauge and the first thermometer.

7. The liquid ammonia evaporation apparatus of claim 1, wherein: The top of the housing is connected to a safety valve port and a spare port, the safety valve port being used to connect an external safety valve.

8. The liquid ammonia evaporation apparatus of claim 1, wherein: The heat exchanger uses ethylene glycol as the heat transfer medium.

9. The liquid ammonia evaporation apparatus of claim 1, wherein: The housing is provided with a level gauge mounting port and a first thermometer mounting port.

10. The liquid ammonia evaporation apparatus of claim 1, wherein: The drain pipe is equipped with a second thermometer mounting port.

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