A heating system for contaminated nitrogen

Abstract

The utility model discloses a kind of heating systems for dirty nitrogen, including rectifying column, the outlet end of rectifying column is connected with dirty nitrogen exhaust pipe, dirty nitrogen exhaust pipe is connected with dirty nitrogen preheater, the outlet end of dirty nitrogen preheater is connected with first gas pipe, first gas pipe is connected with electric heater, the import end of dirty nitrogen preheater is connected with first gas inlet pipe, first gas inlet pipe is connected with nitrogen compressor, the outlet end of dirty nitrogen preheater is connected with second gas pipe, second gas pipe is connected with cooler.In the utility model, dirty nitrogen discharged by rectifying column is first transported to dirty nitrogen preheater to heat, and the heated dirty nitrogen is then transported to electric heater to be warmed up, and the gas used to heat dirty nitrogen is high-temperature nitrogen compressed by nitrogen compressor, and the nitrogen compressed by nitrogen compressor is transported to dirty nitrogen preheater to heat dirty nitrogen, so that the temperature of dirty nitrogen can be raised to about 90℃, thereby reducing the energy consumption of electric heater, and playing the role of energy saving and emission reduction.

Description

Technical Field

[0001] This utility model relates to the field of heating system technology, and in particular to a heating system for polluted nitrogen. Background Technology

[0002] Air separation equipment uses air as raw material, transforms it into a liquid state through compression and deep freezing, and then gradually separates oxygen, nitrogen, and inert gases such as argon from the liquid air through distillation. In the iron and steel metallurgy industry, waste nitrogen is a gas discharged from the distillation column of the air separation equipment. Waste nitrogen contains a large amount of nitrogen. In order to avoid nitrogen waste, waste nitrogen needs to be reused. However, waste nitrogen needs to be heated when used, generally to about 180°C. At present, most waste nitrogen is heated by electric heating, but this will lead to increased power consumption, greatly increasing energy loss, and also violating the national environmental goals of carbon neutrality and carbon peaking. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a heating system for polluted nitrogen.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: A heating system for waste nitrogen includes a distillation column, an outlet end of which is connected to a waste nitrogen exhaust pipe, one end of which is connected to a waste nitrogen preheater, an outlet end of which is connected to a first outlet pipe, the first outlet pipe being connected to an electric heater, an inlet end of which is connected to a first inlet pipe, the first inlet pipe also being connected to a nitrogen compressor, and an outlet end of which is connected to a second outlet pipe, the second outlet pipe also being connected to a cooler.

[0005] Preferably, a first connecting pipe is also provided between the distillation column and the electric heater.

[0006] Preferably, a second connecting pipe is provided between the nitrogen compressor and the cooler.

[0007] Preferably, the cooler is a water-cooled cooler.

[0008] Preferably, the waste nitrogen preheater includes a shell, inside which two baffles are fixedly installed, dividing the interior of the shell into an inlet chamber, an outlet chamber, and a connecting chamber. The connecting chamber is located between the inlet chamber and the outlet chamber, and a connecting component is provided in the connecting chamber for connecting the inlet chamber and the outlet chamber. The inlet chamber is connected to the waste nitrogen exhaust pipe, and the outlet chamber is connected to the first outlet pipe. The shell is provided with a third inlet pipe and a third outlet pipe. The third outlet pipe is connected to the second outlet pipe, and the third inlet pipe is connected to the first inlet pipe. Both the third inlet pipe and the third outlet pipe are connected to the connecting chamber.

[0009] Preferably, the connecting assembly includes multiple connecting pipes, with both ends of each connecting pipe fixedly connected to two baffles, and both ends of each connecting pipe communicating with the air inlet chamber and the air outlet chamber, respectively, and the multiple connecting pipes arranged in parallel.

[0010] Preferably, a heat sink is fixedly installed on the connecting pipe.

[0011] Preferably, the connecting pipe is used to transport contaminated nitrogen, and the connecting cavity is used to transport nitrogen gas, with the flow directions of contaminated nitrogen and nitrogen gas being opposite.

[0012] The beneficial effects of adopting the above technical solution are as follows: In this invention, before electrically heating the waste nitrogen, the waste nitrogen is first transported to a waste nitrogen preheater. The waste nitrogen preheater is also connected to a nitrogen compressor. During the compression process of the nitrogen gas, the nitrogen compressor will raise the temperature of the nitrogen gas. After the high-temperature nitrogen gas is output from the nitrogen compressor, it can be transported to the waste nitrogen preheater to preheat the waste nitrogen, so that the temperature of the waste nitrogen can be raised to about 90°C. After being preheated, the waste nitrogen is transported to the electric heater for heating, which can recover and utilize the waste heat and reduce the energy consumption of the electric heater, thereby reducing the overall energy consumption of the air separation equipment, and thus reducing the enterprise's energy consumption and production costs. Attached Figure Description

[0013] Figure 1 This is a system diagram of this utility model; Figure 2 This is a three-dimensional schematic diagram of the waste nitrogen preheater of this utility model; Figure 3 This is a schematic diagram of the structure of the waste nitrogen preheater of this utility model; Figure 4 This is a three-dimensional schematic diagram of the connecting component of this utility model.

[0014] In the diagram: 1 is the distillation column, 2 is the waste nitrogen exhaust pipe, 3 is the waste nitrogen preheater, 4 is the first outlet pipe, 5 is the electric heater, 6 is the first inlet pipe, 7 is the nitrogen compressor, 8 is the second outlet pipe, 9 is the cooler, 10 is the first connecting pipe, 11 is the second connecting pipe, 12 is the shell, 13 is the baffle, 14 is the inlet chamber, 15 is the outlet chamber, 16 is the connecting chamber, 17 is the third inlet pipe, 18 is the third outlet pipe, and 19 is the connecting pipe. Detailed Implementation

[0015] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1As shown, a heating system for waste nitrogen includes a distillation column 1, from which waste nitrogen is discharged. The outlet of the distillation column 1 is connected to a waste nitrogen exhaust pipe 2. One end of the waste nitrogen exhaust pipe 2 is connected to a waste nitrogen preheater 3. The waste nitrogen preheater 3 has two inlet ends and two outlet ends, which are respectively used for the input of waste nitrogen and the input of high-temperature nitrogen, and the output of waste nitrogen and the output of high-temperature nitrogen. The waste nitrogen exhaust pipe 2 is connected to the waste nitrogen inlet end of the waste nitrogen preheater 3. The waste nitrogen outlet end of the waste nitrogen preheater 3 is connected to a first outlet pipe 4. The other end of the first outlet pipe 4 is also connected to an electric heater 5. The nitrogen inlet end of the waste nitrogen preheater 3 is connected to a first inlet pipe 6. The other end of the first inlet pipe 6 is also connected to a nitrogen compressor 7. The nitrogen outlet end of the waste nitrogen preheater 3 is connected to a second outlet pipe 8. The other end of the second outlet pipe 8 is also connected to a cooler 9, which is a water-cooled cooler.

[0019] In this invention, the waste nitrogen discharged from the distillation column 1 enters the waste nitrogen preheater 3 through the waste nitrogen exhaust pipe 2, and is then transported to the electric heater 5 through the first outlet pipe 4 from the outlet end of the waste nitrogen preheater 3. After being heated by the electric heater 5, the waste nitrogen is heated to 180°C and then utilized. In the steel industry, nitrogen is an essential gas in the production process. Nitrogen needs to be compressed by a nitrogen compressor before it can be used in production. After being compressed by the nitrogen compressor 7, the nitrogen temperature rises, and the high-temperature nitrogen needs to be further processed... It can only be used after cooling. In order to prevent the waste of this heat, the nitrogen compressor 7 is connected to the waste nitrogen preheater 3 through the first air inlet pipe 6. The high-temperature nitrogen gas compressed by the nitrogen compressor 7 is sent to the waste nitrogen preheater 3 to heat the waste nitrogen, so that the temperature of the waste nitrogen in the waste nitrogen preheater 3 is raised to about 90°C. The heated waste nitrogen is then heated by the electric heater 5, which can reduce energy consumption and play a role in energy saving and environmental protection. The nitrogen gas is discharged from the outlet end of the waste nitrogen preheater 3 and sent to the cooler 9 through the second air outlet pipe 8 for cooling.

[0020] It should be noted that valves are installed on the waste nitrogen exhaust pipe 2, the first exhaust pipe 4, the first intake pipe 6, and the second exhaust pipe 8 to control the opening and closing of the pipes.

[0021] Furthermore, a first connecting pipe 10 is provided between the distillation column 1 and the electric heater 5. The first connecting pipe 10 is equipped with a valve. When the valve on the first connecting pipe 10 is closed, the waste nitrogen discharged from the distillation column 1 can be transported from the waste nitrogen exhaust pipe 2 to the waste nitrogen preheater 3 for heating. When the waste nitrogen preheater 3 needs maintenance, the valve on the waste nitrogen exhaust pipe 2 can be closed and the valve on the first connecting pipe 10 can be opened, and the waste nitrogen can be directly transported from the first connecting pipe 10 to the electric heater 5 for heating.

[0022] Furthermore, a second connecting pipe 11 is provided between the nitrogen compressor 7 and the cooler 9. The high-temperature nitrogen output from the nitrogen compressor 7 has a large flow rate, while the waste nitrogen preheater 3 requires a smaller flow rate. Therefore, a portion of the high-temperature nitrogen can be directly transported to the cooler 9 for cooling through the second connecting pipe 11.

[0023] Furthermore, such as Figure 2 and Figure 3 As shown, the waste nitrogen preheater 3 includes a shell 12. Two baffles 13 are fixedly installed inside the shell 12. The two baffles 13 are arranged in parallel and divide the interior of the shell 12 into an air inlet chamber 14, an air outlet chamber 15, and a connecting chamber 16. The connecting chamber 16 is located between the air inlet chamber 14 and the air outlet chamber 15. A connecting component is provided in the connecting chamber 16 for connecting the air inlet chamber 14 and the air outlet chamber 15. The air inlet chamber 14 is connected to the waste nitrogen exhaust pipe 2, and the air outlet chamber 15 is connected to the first air outlet pipe 4. The shell 12 is provided with a third air inlet pipe 17 and a third air outlet pipe 18. The third air outlet pipe 18 is connected to the second air outlet pipe 8, and the third air inlet pipe 17 is connected to the first air inlet pipe 6. Both the third air inlet pipe 17 and the third air outlet pipe 18 are connected to the connecting chamber 16. In this embodiment, the waste nitrogen discharged from the distillation column 1 is transported to the inlet chamber 14 of the waste nitrogen preheater 3 through the waste nitrogen exhaust pipe 2, and then enters the outlet chamber 15 through the connecting assembly. Finally, it is transported to the electric heater 5 for heating through the first outlet pipe 4. The nitrogen gas discharged after compression by the nitrogen compressor 7 can enter the connecting chamber 16 through the third inlet pipe 17. The high-temperature nitrogen gas in the connecting chamber 16 can heat the waste nitrogen in the connecting assembly, raising the temperature of the waste nitrogen to about 90°C. Finally, the nitrogen gas is discharged from the third outlet pipe 18.

[0024] Furthermore, such as Figure 4 As shown, the connecting assembly includes multiple connecting pipes 19. The two ends of the connecting pipes 19 are fixedly connected to two baffles 13 respectively. The two ends of the connecting pipes 19 are connected to the air inlet chamber 14 and the air outlet chamber 15 respectively. The multiple connecting pipes 19 are arranged in parallel. After the polluted nitrogen enters the air inlet chamber 14, it can be transported to the air outlet chamber 15 through the connecting pipes 19. When the polluted nitrogen passes through the connecting pipes 19, it can be heated by the high temperature nitrogen outside the connecting pipes 19.

[0025] Furthermore, heat sinks are fixedly installed on the connecting pipe 19 to improve heating efficiency.

[0026] Furthermore, the connecting pipe 19 is used to transport polluted nitrogen, and the connecting cavity 16 is used to transport nitrogen gas. The flow directions of polluted nitrogen and nitrogen gas are opposite, so that the nitrogen gas can heat the polluted nitrogen more fully.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heating system for waste nitrogen, characterized in that, The system includes a distillation column (1), the outlet of which is connected to a nitrogen exhaust pipe (2), one end of which is connected to a nitrogen preheater (3), the outlet of which is connected to a first exhaust pipe (4), the first exhaust pipe (4) is also connected to an electric heater (5), the inlet of which is connected to a first inlet pipe (6), the first inlet pipe (6) is also connected to a nitrogen compressor (7), the outlet of which is connected to a second exhaust pipe (8), and the second exhaust pipe (8) is also connected to a cooler (9).

2. The heating system for waste nitrogen according to claim 1, characterized in that, A first connecting pipe (10) is also provided between the distillation column (1) and the electric heater (5).

3. The heating system for waste nitrogen according to claim 1, characterized in that, A second connecting pipe (11) is provided between the nitrogen compressor (7) and the cooler (9).

4. A heating system for waste nitrogen according to claim 1, characterized in that, The cooler (9) is a water-cooled cooler.

5. A heating system for waste nitrogen according to claim 1, characterized in that, The waste nitrogen preheater (3) includes a shell (12), inside which two baffles (13) are fixedly installed. The two baffles (13) divide the interior of the shell (12) into an inlet chamber (14), an outlet chamber (15), and a connecting chamber (16). The connecting chamber (16) is located between the inlet chamber (14) and the outlet chamber (15). A connecting component is provided in the connecting chamber (16) for connecting the inlet chamber (14) and the outlet chamber (15). The air chamber (14) is connected to the nitrogen exhaust pipe (2), and the air outlet chamber (15) is connected to the first air outlet pipe (4); the housing (12) is provided with a third air inlet pipe (17) and a third air outlet pipe (18), the third air outlet pipe (18) is connected to the second air outlet pipe (8), the third air inlet pipe (17) is connected to the first air inlet pipe (6), and both the third air inlet pipe (17) and the third air outlet pipe (18) are connected to the connecting cavity (16).

6. A heating system for waste nitrogen according to claim 5, characterized in that, The connecting assembly includes multiple connecting pipes (19), with both ends of the connecting pipes (19) fixedly connected to the two baffles (13) respectively, and both ends of the connecting pipes (19) connected to the air inlet chamber (14) and the air outlet chamber (15) respectively, and the multiple connecting pipes (19) are arranged in parallel.

7. A heating system for waste nitrogen according to claim 6, characterized in that, A heat sink is fixedly installed on the connecting pipe (19).

8. A heating system for waste nitrogen according to claim 6, characterized in that, The connecting pipe (19) is used to transport polluted nitrogen, and the connecting cavity (16) is used to transport nitrogen gas. The flow directions of polluted nitrogen and nitrogen gas are opposite.

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