Nitrogen recovery device for cooling electrothermal furnace

Abstract

The utility model discloses a nitrogen recovery device for cooling an electrothermal furnace, and relates to the field of electrothermal furnaces. The nitrogen recovery device for cooling the electrothermal furnace comprises a recovery assembly, an airflow input pipe is arranged outside the recovery assembly and used for introducing air and discharging liquid nitrogen, the recovery assembly comprises a three-way valve, a nitrogen storage tank and a settling tank, the three-way valve is fixedly connected to the output end of a cooling pipeline, and the three-way valve is used for recovering nitrogen in a classified mode. The input end of the nitrogen storage tank is fixedly connected to one end of the three-way valve, one end of the settling tank is fixedly connected to one end of the three-way valve, and the settling tank is used for guiding in and settling separation of air and nitrogen mixed airflow. According to the nitrogen recovery device for cooling of the electrothermal furnace, residual liquid nitrogen in the cooling pipe is removed by arranging the air flow input pipe, waste caused by incomplete nitrogen recovery is prevented, meanwhile, the three-way valve is arranged for classified recovery of nitrogen, and the situation that final air flow with air enters the nitrogen storage tank and contains impurities is prevented.

Description

Technical Field

[0001] This utility model relates to the field of electric furnace technology, specifically to a nitrogen recovery device for cooling electric furnaces. Background Technology

[0002] Electric furnaces, as key equipment in industrial heat processing and high-temperature laboratory research, have a wide range of applications, including metal smelting, material sintering, chemical synthesis, and various precision heat treatment processes. Currently, cooling methods for electric furnaces mainly include natural cooling, forced air cooling, and external water cooling. Natural cooling is widely used due to its simplicity and lack of additional energy consumption; however, its cooling process is extremely lengthy, severely restricting the pace of continuous production and failing to meet the high-efficiency demands of modern industry. While forced air cooling and external water cooling can shorten cooling time to some extent, their cooling capacity and control precision remain insufficient for scenarios requiring higher cooling rates or lower temperatures. Liquid nitrogen, due to its extremely low boiling point, large latent heat of vaporization, chemical inertness, and relatively easy availability, is considered a highly promising and efficient refrigerant.

[0003] In existing systems, liquid nitrogen absorbs heat and vaporizes within the pipeline before being absorbed by a recovery unit at the end of the pipeline. However, as the temperature of the electric furnace decreases, the vaporization rate of the liquid nitrogen slows down, resulting in the incomplete recovery of residual liquid nitrogen. To address this issue, this invention provides a nitrogen recovery device for cooling electric furnaces. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a nitrogen recovery device for cooling electric furnaces. It solves the problem that in existing systems, liquid nitrogen absorbs heat and vaporizes in the pipeline, which is then absorbed by the recovery unit at the end of the pipeline. However, as the temperature of the electric furnace decreases, the vaporization rate of the liquid nitrogen decreases, and the remaining liquid nitrogen cannot be recovered, resulting in incomplete recovery.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen recovery device for cooling an electric furnace, comprising a recovery component, an airflow input pipe externally disposed on the recovery component, the airflow input pipe being used to introduce air and discharge liquid nitrogen, the recovery component comprising a three-way valve, a nitrogen storage tank, and a settling tank, the three-way valve being fixedly connected to the output end of a cooling pipe, the three-way valve being used for classifying and recovering nitrogen, the input end of the nitrogen storage tank being fixedly connected to one end of the three-way valve, one end of the settling tank being fixedly connected to one end of the three-way valve, and the settling tank being used for introducing and separating a mixed air-nitrogen gas flow.

[0006] Preferably, the recovery assembly further includes a solenoid valve and a nitrogen recovery pipe. The solenoid valve is fixedly connected to the top of the electric furnace and is used to control the recovery of nitrogen in the pipe. One end of the nitrogen recovery pipe is fixedly connected to the solenoid valve, and the other end of the nitrogen recovery pipe is fixedly connected to a three-way valve.

[0007] Preferably, the settling tank has an air outlet at the top for outputting air, and a nitrogen outlet at the bottom for recovering pure nitrogen.

[0008] Preferably, a first compressor is installed on the airflow input pipe, and the first compressor is used to introduce air into the airflow input pipe.

[0009] Preferably, the recovery assembly further includes a first output pipe, a second output pipe, and a second compressor. One end of the first output pipe is fixedly connected to the output end of a three-way valve, and the other end of the first output pipe is fixedly connected to the input end of a settling tank. The second output pipe is fixedly connected to the other output end of the three-way valve, and the second output pipe is installed on the input end of the second compressor. The nitrogen storage tank is installed on the output end of the second compressor.

[0010] Preferably, a pressure gauge is provided next to the recovery component. The pressure gauge is installed at the outlet of the cooling pipe and is used to detect the air pressure inside the cooling pipe.

[0011] This utility model discloses a nitrogen recovery device for cooling electric furnaces, which has the following beneficial effects: the nitrogen recovery device for cooling electric furnaces removes the remaining liquid nitrogen in the cooling tube by setting an air flow inlet pipe, preventing waste caused by incomplete nitrogen recovery, and sets a three-way valve to classify and recover nitrogen, preventing the final airflow containing air from entering the nitrogen storage tank and causing impurities. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the overall structure of the recycling component of this utility model.

[0015] In the diagram: 1. Airflow inlet pipe; 11. First compressor; 2. Recovery assembly; 21. Solenoid valve; 22. Nitrogen recovery pipe; 23. Three-way valve; 24. First output pipe; 25. Second output pipe; 26. Second compressor; 27. Nitrogen storage tank; 28. Settling tank; 281. Air outlet; 282. Nitrogen outlet; 3. Pressure gauge. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] This application provides a nitrogen recovery device for cooling electric furnaces, which solves the problem that in existing systems, liquid nitrogen absorbs heat and vaporizes in the pipeline, and is then absorbed by the recovery unit at the end of the pipeline. However, as the temperature of the electric furnace decreases, the vaporization rate of the liquid nitrogen decreases, and the final liquid nitrogen residue cannot be recovered, resulting in incomplete recovery.

[0018] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0019] This utility model discloses a nitrogen recovery device for cooling an electric furnace.

[0020] Example 1

[0021] According to the appendix Figure 1-2As shown, the system includes a recovery assembly 2, with an external airflow inlet pipe 1 for introducing air and discharging liquid nitrogen. A first compressor 11 is installed on the airflow inlet pipe 1 to introduce air into it. The recovery assembly 2 includes a three-way valve 23, a nitrogen storage tank 27, and a settling tank 28. The three-way valve 23 is fixedly connected to the output end of the cooling pipe and is used for the classified recovery of nitrogen. The input end of the nitrogen storage tank 27 is fixedly connected to one end of the three-way valve 23, and one end of the settling tank 28 is fixedly connected to one end of the three-way valve 23. The settling tank 28 is used for introducing and separating the air-nitrogen mixed airflow. The top of the tank 28 is provided with an air outlet 281 for outputting air, and the bottom of the settling tank 28 is provided with a nitrogen outlet 282 for recovering pure nitrogen. In use, after the liquid nitrogen is transported into the cooling pipe, it continuously absorbs heat and vaporizes, and is then absorbed by the three-way valve 23 at the top and enters the nitrogen storage tank 27 for recovery. After the temperature of the electric furnace wall drops, the heat absorption efficiency of the residual liquid nitrogen in the cooling pipe decreases. Then, the first compressor 11 absorbs the outside air into the cooling pipe, transports the liquid nitrogen into the three-way valve 23 and from another outlet into the settling tank 28 for separation of air and nitrogen, and then recovers the pure nitrogen.

[0022] The recovery assembly 2 also includes a solenoid valve 21 and a nitrogen recovery pipe 22. The solenoid valve 21 is fixedly connected to the top of the electric furnace and is used to control the recovery of nitrogen in the pipe. One end of the nitrogen recovery pipe 22 is fixedly connected to the solenoid valve 21, and the other end of the nitrogen recovery pipe 22 is fixedly connected to the three-way valve 23.

[0023] Example 2

[0024] Based on Example 1, according to Appendix Figure 1-2 As shown, the recovery assembly 2 also includes a first output pipe 24, a second output pipe 25, and a second compressor 26. One end of the first output pipe 24 is fixedly connected to the output end of the three-way valve 23, and the other end of the first output pipe 24 is fixedly connected to the input end of the settling tank 28. The second output pipe 25 is fixedly connected to the other output end of the three-way valve 23 and is installed on the input end of the second compressor 26. The nitrogen storage tank 27 is installed on the output end of the second compressor 26. A pressure gauge 3 is provided next to the recovery assembly 2. The pressure gauge 3 is installed at the outlet of the cooling pipe and is used to detect the gas pressure inside the cooling pipe.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A nitrogen recovery device for the cooling of an electric furnace, comprising a recovery assembly (2), characterized in that, The recovery assembly (2) is provided with an airflow inlet pipe (1) for introducing air and discharging liquid nitrogen. The recovery assembly (2) includes: A three-way valve (23) is fixedly connected to the output end of the cooling pipe. The three-way valve (23) is used for the classified recovery of nitrogen. A nitrogen storage tank (27) is provided, the input end of which is fixedly connected to one end of a three-way valve (23); Settling tank (28), one end of which is fixedly connected to one end of three-way valve (23), the settling tank (28) is used for the introduction and settling of air-nitrogen mixed gas flow.

2. The nitrogen gas recovery device for temperature reduction of an electric furnace according to claim 1, characterized by: The recycling component (2) also includes: Solenoid valve (21), which is fixedly connected to the top of the electric furnace, is used to control the recovery of nitrogen in the pipeline; Nitrogen recovery pipe (22), one end of which is fixedly connected to solenoid valve (21), and the other end of which is fixedly connected to three-way valve (23).

3. The nitrogen gas recovery device for temperature reduction of an electric furnace according to claim 1, characterized by: The settling tank (28) has an air outlet (281) at the top for outputting air, and a nitrogen outlet (282) at the bottom for recovering pure nitrogen.

4. The nitrogen gas recovery device for temperature reduction of an electric furnace according to claim 1, characterized by: A first compressor (11) is installed on the airflow input pipe (1), and the first compressor (11) is used to introduce air into the airflow input pipe (1).

5. The nitrogen gas recovery device for temperature reduction of an electric furnace according to claim 1, characterized by: The recycling component (2) also includes: The first output pipe (24) has one end fixedly connected to the output end of the three-way valve (23) and the other end fixedly connected to the input end of the settling tank (28). The second output pipe (25) is fixedly connected to the other output end of the three-way valve (23); The second compressor (26) has the second output pipe (25) installed on the input end of the second compressor (26), and the nitrogen storage tank (27) is installed on the output end of the second compressor (26).

6. The nitrogen gas recovery unit for temperature reduction of an electric furnace according to claim 1, characterized by: A pressure gauge (3) is provided next to the recovery component (2). The pressure gauge (3) is installed at the outlet of the cooling pipe and is used to detect the air pressure inside the cooling pipe.

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