Air separation purification system for energy-saving application of high-temperature steam waste heat

Abstract

The utility model provides an air separation purification system for energy-saving application of high-temperature steam waste heat, which comprises a precooling system output pipeline, an adsorber I, an adsorber II and a fractionating tower pipeline, the precooling system output pipeline is connected with the adsorber I and the adsorber II, the adsorber I and the adsorber II are respectively connected with the fractionating tower pipeline, and the fractionating tower pipeline is connected with the adsorber I and the adsorber II. Input pipelines of the adsorber I and the adsorber II are provided with regeneration gas outlet pipes, the adsorber I and the adsorber II are connected with a heating pipeline, the heating pipeline is provided with an electric heater and a steam heat exchanger, a discharge port of the steam heat exchanger is provided with a high-temperature regulating valve, and a high-temperature pipeline is additionally arranged between the high-temperature regulating valve and the steam heat exchanger; and a steam input pipeline and a condensate water output pipeline are arranged on the steam heat exchanger. According to the air separation purifier, steam can be recycled and reasonably utilized, and the heating energy consumption of the air separation purifier is reduced.

Description

Technical Field

[0001] This utility model relates to the field of air separation technology, specifically to an air separation purification system that utilizes the waste heat of high-temperature steam for energy saving. Background Technology

[0002] Currently, natural gas hydrogen production units employ a natural gas-to-hydrogen process. This process involves mixing natural gas and steam, followed by conversion, intermediate heat exchange, and pressure swing adsorption purification. Because the system requires a continuous steam supply, the unit is equipped with a boiler to produce its own steam to meet demand. However, considering the need for continuous boiler production and supply security, some steam is inevitably released into the atmosphere, resulting in heat loss. Furthermore, the air separation purification system requires a heat source to remove impurities such as moisture, carbon dioxide, and acetylene from the purifier. Existing technology uses electric heating furnaces, which consume significant energy. Therefore, how to recover and rationally utilize the steam heat is a key area that needs to be explored. Utility Model Content

[0003] The purpose of this invention is to provide an air separation purification system that utilizes the waste heat of high-temperature steam to solve the above problems, thereby recovering steam for rational use and reducing the heating energy consumption of the air separation purifier.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: an air separation purification system for energy-saving application of high-temperature steam waste heat, comprising a precooling system output pipeline, adsorber I, adsorber II, and a fractionation tower pipeline. The precooling system output pipeline is connected to adsorber I and adsorber II. Adsorbers I and II are respectively connected to the fractionation tower pipeline. A regeneration outlet pipe is provided on the input pipeline of adsorber I and adsorber II. A heating pipeline is connected to adsorber I and adsorber II. An electric heater and a steam heat exchanger are provided on the heating pipeline. A high-temperature regulating valve is provided at the discharge port of the steam heat exchanger. A high-temperature pipeline is added between the high-temperature regulating valve and the steam heat exchanger. A steam input pipeline and a condensate output pipeline are provided on the steam heat exchanger.

[0005] As a preferred embodiment of this invention, the input pipelines of the adsorber I and adsorber II are provided with a low-pressure pipeline and a medium-pressure pipeline, which are connected in parallel to the regeneration outlet pipeline. A silencer is provided on the regeneration outlet pipeline, which is circulatedly connected to the fractionation tower pipeline. The electric heater and the steam heat exchanger are provided with a parallel pipeline, which is located in the pipeline from the regeneration outlet pipeline to the fractionation tower pipeline.

[0006] As a preferred embodiment of this invention, a drying area is provided on the pipelines of the adsorber I and adsorber II, and the regeneration outlet pipe is connected to the drying area.

[0007] As a preferred embodiment of this invention, the output pipelines of the adsorber I and adsorber II are equipped with a temperature detection element I, a temperature indicator I, a local pressure gauge, a pressure transmitter, and a pressure indicator alarm.

[0008] As a preferred embodiment of this invention, the fractionation tower pipeline is equipped with analytical elements and remote analytical transmission.

[0009] As a preferred embodiment of this invention, valves are provided on the pipelines of the electric heater and the steam heat exchanger.

[0010] As a preferred embodiment of this invention, a circulation pipeline connected to the heating pipeline is added to the pipeline from the regenerated gas outlet to the fractionation tower pipeline.

[0011] As a preferred embodiment of this invention, the high-temperature pipeline is provided with a temperature detection element II and a temperature indicator II, and the temperature indicator II is electrically connected to the temperature detection element II.

[0012] The beneficial effects of this utility model are as follows: The raw material air is compressed and then enters the air precooling system. The air precooling system outputs through the precooling system output pipeline and then enters the air separation and purification system. The air separation and purification system needs to remove impurities such as pure water, carbon dioxide, and acetylene through a heat source. Since the existing technology uses electric heaters, the principle of this structure is to replace the energy consumption of electric heating in air separation and purification by absorbing steam heat energy. The adsorber I and adsorber II are connected by a heating pipeline, and an electric heater and a steam heat exchanger are installed on the heating pipeline. The steam in the steam input pipeline is steam generated by the natural gas hydrogen production unit. By recovering the heat energy of this steam, the heated steam is used as a heat source to heat and purify the material to be purified. Some of the heated steam will generate condensate due to heat release, which is output through the condensate output pipeline. This can effectively recover and rationally utilize the steam, reducing the heating energy consumption of the air separation and purification unit. A high-temperature regulating valve is installed at the discharge port of the steam heat exchanger, and a high-temperature pipeline is added between the high-temperature regulating valve and the steam heat exchanger. This structure can effectively insulate and regulate the temperature. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the principle of this utility model;

[0014] In the diagram: 1. Precooling system output pipeline; 2. Adsorber I; 3. Adsorber II; 4. Fractionating tower pipeline; 5. Regeneration outlet pipeline; 6. Heating pipeline; 7. Electric heater; 8. Steam heat exchanger; 9. High-temperature regulating valve; 10. High-temperature pipeline; 11. Steam input pipeline; 12. Condensate output pipeline; 13. Low-pressure pipeline; 14. Medium-pressure pipeline; 15. Silencer; 16. Parallel pipeline; 17. Drying area; 18. Temperature sensing element I; 19. Temperature indicator I; 20. Local pressure gauge; 21. Pressure transmitter; 22. Pressure indicator alarm; 23. Analytical element; 24. Remote analytical transmission; 25. Valve; 26. Circulation pipeline; 27. Temperature sensing element II; 28. Temperature sensing element II. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 As shown, an air separation purification system for energy-saving application of high-temperature steam waste heat includes a precooling system output pipeline 1, an adsorber I2, an adsorber II3, and a fractionation tower pipeline 4. The precooling system output pipeline 1 is connected to adsorber I2 and adsorber II3. Adsorbers I2 and II3 are respectively connected to the fractionation tower pipeline 4. A regeneration outlet pipe 5 is provided on the input pipelines of adsorber I2 and adsorber II3. A heating pipeline 6 is provided connecting adsorber I2 and adsorber II3. An electric heater 7 and a steam heat exchanger 8 are provided on the heating pipeline 6. A high-temperature regulating valve 9 is provided at the discharge port of the steam heat exchanger 8. A high-temperature pipeline 10 is added between the high-temperature regulating valve 9 and the steam heat exchanger 8. A steam input pipeline 11 and a condensate output pipeline 12 are provided on the steam heat exchanger 8.

[0017] In this embodiment, the raw material air of this invention is compressed and then enters the air precooling system. The air precooling system outputs through the precooling system output pipe 1 and then enters the air separation purification system. The air separation purification system needs to remove impurities such as pure water, carbon dioxide, and acetylene through a heat source. Since the existing technology uses electric heaters, the principle of this structure is to replace the energy consumption of electric heating in air separation purification by absorbing steam heat energy. The adsorber I2 and adsorber II3 are connected by a heating pipe 6. The heating pipe 6 is equipped with an electric heater 7 and a steam heat exchanger 8. The steam in the steam input pipe is steam generated by the natural gas hydrogen production unit. By recovering the heat energy of this steam, the heated steam is used as a heat source to heat and purify the material to be purified. Some of the heated steam will generate condensate due to heat release, which is output through the condensate output pipe. This can effectively recover and rationally utilize the steam, reducing the heating energy consumption of the air separation purifier. The discharge port of the steam heat exchanger 8 is equipped with a high-temperature regulating valve 9. A high-temperature pipe 10 is added between the high-temperature regulating valve 9 and the steam heat exchanger 8. This structure can effectively insulate and regulate the temperature.

[0018] Specifically, the precooling system, air separation purification system, and fractionation tower constitute one step of the air separation unit's process structure. Adsorbers I2 and II3 are preferably molecular sieve adsorbers, which offer relatively stable performance. The regeneration outlet pipe 5 outputs waste nitrogen gas.

[0019] As a technical optimization of this utility model, a low-pressure pipeline 13 and a medium-pressure pipeline 14 are provided on the input pipelines of adsorber I2 and adsorber II3. The low-pressure pipeline 13 and the medium-pressure pipeline 14 are connected in parallel to the regeneration outlet pipeline 5. A silencer 15 is provided on the regeneration outlet pipeline 5. The regeneration outlet pipeline 5 is circulatedly connected to the fractionation tower pipeline 4. The electric heater 7 and the steam heat exchanger 8 are provided with a parallel pipeline 16. The parallel pipeline 16 is provided in the pipeline from the regeneration outlet pipeline 5 to the fractionation tower pipeline 4.

[0020] In this embodiment, the silencer 15 effectively silences the regeneration outlet pipe 5. The regeneration outlet pipe 5 is circulatedly connected to the fractionation tower pipeline 4. The regeneration gas exiting the regeneration outlet pipe 5 is initially purified air when the air separation unit starts up. After the air separation unit starts up and there is sufficient regeneration gas, the waste nitrogen flow path can be used as the regeneration gas for adsorber I2 and adsorber II3. This process is crucial for the stable operation of the air separation unit, ensuring the effective regeneration of adsorber I2 and adsorber II3, thereby maintaining the efficiency of the entire air separation system. The pipeline 16 is set in the pipeline from the regeneration outlet pipe 5 to the fractionation tower pipeline 4, thus forming a closed loop and achieving effective regeneration.

[0021] As a technical optimization of this utility model, a drying area 17 is provided on the pipelines of adsorber I2 and adsorber II3, and the regeneration outlet pipe 5 is connected to the drying area 17.

[0022] In this embodiment, the drying section 17 allows the adsorber I2 pipeline, the adsorber II3 pipeline, and the regeneration outlet pipe 5 to reach the drying collection point.

[0023] As a technical optimization of this utility model, temperature detection element I18 and temperature indicator I19, local pressure gauge 20, pressure transmitter 21 and pressure indicator alarm 22 are provided on the output pipelines of adsorber I2 and adsorber II3.

[0024] In this embodiment, the main functions of the temperature sensing element I18 and the temperature indicator I19 are to measure, display, and control the temperature. They can convert the temperature information of the equipment into electrical signals and then transmit them to the monitoring software via wired or wireless means. After receiving the signals, the monitoring software will analyze, process, and display them, so that the output pipelines of the adsorber I2 and adsorber II3 can intuitively understand the temperature data. The local pressure gauge 20 and the pressure transmitter 21 are used to measure the fluid pressure. The pressure indicator alarm 22 is used to detect the vacuum degree of the gas or liquid and immediately issue an alarm when the vacuum degree exceeds the upper limit alarm value, falls below the lower limit alarm value, or exceeds the set range.

[0025] As a technical optimization of this utility model, the fractionation tower pipeline 4 is equipped with an analytical element 23 and an analytical transmission device 24.

[0026] In this embodiment, the product gas composition can be analyzed by the analysis element 23, and the analysis remote transmission 24 can perform data acquisition and monitoring.

[0027] As a technical optimization of this utility model, valves 25 are provided on the pipelines of electric heater 7 and steam heat exchanger 8.

[0028] In this embodiment, the flow rate and opening / closing status can be controlled by valve 25.

[0029] As a technical optimization of this utility model, a circulation pipeline 26 connected to the heating pipeline 6 is added to the pipeline from the regeneration outlet pipe 5 to the fractionation tower pipeline 4.

[0030] In this embodiment, the circulation pipeline 26 is used for regeneration gas circulation heating.

[0031] As a technical optimization of this utility model, a temperature detection element II27 and a temperature indicator II28 are provided on the high-temperature pipeline 10, and the temperature indicator II27 is electrically connected to the temperature detection element II28.

[0032] In this embodiment, the main functions of the temperature sensing element II27 and the temperature indicator II28 are to measure, display and control the temperature. They can convert the temperature information of the equipment into electrical signals and then transmit them to the monitoring software via wired or wireless means. After receiving the signal, the monitoring software will analyze, process and display it, so that the high-temperature pipeline can intuitively understand the temperature data.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An air separation purification system for energy saving application of high temperature steam waste heat, comprising a pre-cooling system output pipeline (1), an adsorber I (2), an adsorber II (3) and a fractionating column pipeline (4), characterized in that: The pre-cooling system output pipeline (1) is connected with adsorber I (2) and adsorber II (3), the adsorber I (2) and adsorber II (3) are connected with fractionating column pipeline (4) respectively, the input pipeline of adsorber I (2) and adsorber II (3) is provided with regenerative outlet pipe (5), adsorber I (2) and adsorber II (3) are connected with heating pipeline (6), the heating pipeline (6) is provided with electric heater (7) and steam heat exchanger (8), the discharge port of steam heat exchanger (8) is provided with high temperature regulating valve (9), high temperature regulating valve (9) and steam heat exchanger (8) are additionally provided with high temperature pipeline (10), steam heat exchanger (8) is provided with steam input pipeline (11) and condensed water output pipeline (12).

2. The air separation purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The input pipeline of adsorber I (2) and adsorber II (3) is provided with low pressure pipeline (13) and medium pressure pipeline (14), the low pressure pipeline (13) and medium pressure pipeline (14) are connected to regenerative outlet pipe (5), the regenerative outlet pipe (5) is provided with silencer (15), the regenerative outlet pipe (5) is connected to fractionating column pipeline (4) in circulation, the electric heater (7) and steam heat exchanger (8) are provided with connecting pipeline (16), the connecting pipeline (16) is arranged in the pipeline of regenerative outlet pipe (5) output to fractionating column pipeline (4).

3. The air separation and purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The pipeline of adsorber I (2) and adsorber II (3) is provided with drying place (17) in collection, the regenerative outlet pipe (5) is collected to drying place (17).

4. The air separation purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The output pipeline of adsorber I (2) and adsorber II (3) is provided with temperature detection element I (18) and temperature indicator I (19), local pressure gauge (20), pressure transmitter (21) and pressure indication alarm (22).

5. The air separation and purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The fractionating column pipeline (4) is provided with analysis element (23) and analysis remote (24).

6. The air separation purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The pipeline of electric heater (7) and steam heat exchanger (8) is provided with valve (25).

7. The air separation and purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The pipeline of regenerative outlet pipe (5) output to fractionating column pipeline (4) is additionally provided with circulation pipeline (26) connected with heating pipeline (6).

8. The air separation and purification system for energy saving application of high temperature steam waste heat according to claim 1, characterized in that: The high temperature pipeline (10) is provided with temperature detection element II (27) and temperature indicator II (28), the temperature indicator II (27) and temperature detection element II (28) are electrically connected.

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