Hydrogen peroxide high-pressure raw material hydrogen energy recovery system

Abstract

The utility model discloses a hydrogen peroxide high-pressure raw material hydrogen energy recovery system, which is characterized in that a hydrogen pipeline is communicated with a first flow meter, and the first flow meter is sequentially communicated with a pressure reduction regulating valve and a first pressure gauge through pipelines to form a high-pressure hydrogen direct pressure reduction process. And the pressure reduction regulating valve and the first pressure gauge form a pressure regulation control loop. The hydrogen pipeline is communicated with a second flow meter, and the second flow meter is communicated with a flow regulating valve, a heater, a hydrogen expansion generator, a gas-liquid separator and a hydrogen discharge pipeline through pipelines. And the second flowmeter and the flow regulating valve form a flow regulating control loop. The energy recovery system generates power, and the power consumption of the production device is reduced. And hydrogen is heated by adopting industrial waste heat, so that the energy is further improved, and more electric energy is recovered. A hydrogen direct pressure reduction process is reserved, switching can be performed when an energy recovery system breaks down, stable supply of downstream hydrogen is guaranteed, and downstream devices are prevented from being stopped.

Description

Technical Field

[0001] This utility model belongs to the field of high-pressure gas energy recovery and utilization technology, specifically relating to a hydrogen peroxide high-pressure raw material hydrogen energy recovery system. Background Technology

[0002] Hydrogen peroxide is a green chemical raw material widely used in chemical synthesis, textile decolorization, paper bleaching, food processing, and water treatment. The production of hydrogen peroxide requires a large amount of industrial hydrogen. Hydrogen, as a raw material for hydrogen peroxide production, has a wide range of sources, such as coal-based hydrogen production, water electrolysis, hydrogen as a byproduct of chlor-alkali production, hydrogen as a byproduct of petroleum cracking, and hydrogen extraction from industrial waste gas.

[0003] The hydrogen pressure required for hydrogen peroxide production is generally 0.2~0.5MPa. However, many industrial hydrogen production processes use high-pressure systems to produce hydrogen. For example, the hydrogen pressure after hydrogen extraction and purification from coal-water slurry is above 3.0MPa. Generally, direct pressure reduction is used as the hydrogen source for hydrogen peroxide production.

[0004] The high-pressure hydrogen depressurization process involves significant pressure and energy waste, and a malfunction in the direct depressurization system could lead to overpressure in downstream equipment and pipelines, posing safety risks. Therefore, adopting a safe, reliable, and stable high-pressure hydrogen energy recovery and utilization method is of paramount importance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydrogen energy recovery system for high-pressure hydrogen peroxide feedstock. This system solves the problem of high-pressure hydrogen energy recovery, avoids the energy waste caused by direct decompression of high-pressure hydrogen, and can utilize waste heat to increase the hydrogen temperature, further increasing the hydrogen energy. This allows the energy recovery system to generate more electricity, achieving energy saving, consumption reduction, and cost savings in the device.

[0006] The technical solution of this utility model:

[0007] A hydrogen peroxide high-pressure feedstock hydrogen energy recovery system is disclosed, wherein the hydrogen pipeline is connected to a first flow meter, and the first flow meter is connected in sequence to a pressure reducing regulating valve and a first pressure gauge via pipelines, forming a direct pressure reduction process for high-pressure hydrogen. The pressure reducing regulating valve and the first pressure gauge form a pressure regulation and control loop.

[0008] Preferably, the hydrogen pipeline is also connected to a second flow meter via a pipeline, and the second flow meter is connected to a flow regulating valve, a hydrogen circulating gas heat exchanger, a heater, a hydrogen expander generator, a gas-liquid separator, and a hydrogen discharge pipeline via a pipeline. The second flow meter and the flow regulating valve form a flow regulation and control loop.

[0009] Preferably, the hydrogen pipeline is also connected in sequence to the hydrogen refueling tower, the circulating gas compressor, and the hydrogen circulating gas heat exchanger. The bottom of the hydrogen refueling tower is connected in sequence to the hydrogen liquid storage tank, the hydrogen liquid storage tank tail gas compressor, and the circulating gas compressor. The hydrogen refueling tower is equipped with an anthraquinone inlet pipe.

[0010] More preferably, the hydrogenation tower is equipped with a hydrogenation tower level gauge and a hydrogenation tower level regulating valve.

[0011] More preferably, a temperature regulating valve is installed on the heater medium inlet pipe, and an expander inlet thermometer is installed on the heater outlet pipe. The temperature regulating valve controls the expander inlet thermometer. The heat medium can be high-temperature hot water, steam, or other industrial waste heat or exhaust heat sources. The temperature regulating valve and the expander inlet thermometer form a temperature regulation and control loop.

[0012] More preferably, the hydrogen expander generator inlet is equipped with an expander inlet thermometer and a second pressure gauge.

[0013] More preferably, the gas-liquid separator outlet is equipped with an expander outlet thermometer and a third pressure gauge.

[0014] More preferably, the gas-liquid separator is equipped with a level gauge and an inlet water level control valve. The level control valve and the level gauge form a level regulation and control loop.

[0015] More preferably, the water outlet of the gas-liquid separator is connected to a spray pump, and the outlet of the spray pump is connected to the inlet pipeline of the expander generator.

[0016] This utility model has the following beneficial effects:

[0017] 1. The energy recovery system generates electricity, reducing the power consumption of production equipment.

[0018] 2. Industrial waste heat is used to heat hydrogen, further enhancing its energy and resulting in the recovery of more electrical energy.

[0019] 3. The flow rate and temperature of the hydrogen system are controlled automatically, ensuring that the downstream hydrogen pressure is synchronously stable.

[0020] 4. The direct hydrogen depressurization process is retained, which can be switched to when the energy recovery system fails, ensuring a stable supply of hydrogen to downstream units and avoiding downtime of downstream equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] In the diagram: 1. First flow meter; 2. Pressure reducing regulating valve; 3. First pressure gauge; 4. Second flow meter; 5. Flow regulating valve; 6. Heater; 7. Temperature regulating valve; 8. Second pressure gauge; 9. Expander inlet thermometer; 10. Hydrogen expander generator; 11. Gas-liquid separator; 12. Liquid level control valve; 13. Liquid level gauge; 14. Injection pump; 16. Expander outlet thermometer; 17. Third pressure gauge; 18. Hydrogen circulating gas heat exchanger; 19. Hydrogen charging tower; 20. Hydrogen charging tower liquid level regulating valve; 21. Hydrogen charging liquid storage tank; 22. Hydrogen charging liquid storage tank tail gas compressor; 23. Circulating gas compressor. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and 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.

[0024] Example 1

[0025] A hydrogen peroxide high-pressure feedstock hydrogen energy recovery system is disclosed, wherein the hydrogen pipeline is connected to a first flow meter 1, and the first flow meter 1 is connected in sequence to a pressure reducing regulating valve 2 and a first pressure gauge 3 via pipelines, forming a direct pressure reduction process for high-pressure hydrogen. The pressure reducing regulating valve 2 and the first pressure gauge 3 form a pressure regulation and control loop.

[0026] Preferably, the hydrogen pipeline is also connected to a second flow meter 4 via a pipeline. The second flow meter 4 is connected to a flow regulating valve 5, a hydrogen circulating gas heat exchanger 17, a heater 6, a hydrogen expansion generator 10, a gas-liquid separator 11, and a hydrogen discharge pipeline via a pipeline. The second flow meter 4 and the flow regulating valve 5 form a flow regulation and control loop.

[0027] Preferably, the hydrogen pipeline is also connected in sequence to the hydrogen refueling tower 18, the circulating gas compressor 23 and the hydrogen circulating gas heat exchanger 17. The bottom of the hydrogen refueling tower 18 is connected in sequence to the hydrogen liquid storage tank 21, the hydrogen liquid storage tank tail gas compressor 22 and the circulating gas compressor 23. The hydrogen refueling tower 18 is provided with anthraquinone inlet pipe.

[0028] More preferably, the hydrogenation tower 18 is equipped with a hydrogenation tower level gauge 19 and a hydrogenation tower level regulating valve 20.

[0029] More preferably, a temperature regulating valve 7 is provided on the medium inlet pipe of heater 6, and an expander inlet thermometer 9 is provided on the outlet pipe of heater 6. The temperature regulating valve 7 controls the expander inlet thermometer 9. The heat medium can be high-temperature hot water, steam, or other industrial waste heat or exhaust heat sources. The temperature regulating valve 7 and the expander inlet thermometer 9 form a temperature regulating control loop.

[0030] More preferably, the hydrogen expander generator 10 is equipped with an expander inlet thermometer 9 and a second pressure gauge 8 at the inlet.

[0031] More preferably, the outlet of the gas-liquid separator 11 is provided with an expander outlet thermometer 15 and a third pressure gauge 16.

[0032] More preferably, the gas-liquid separator 11 is equipped with a level gauge 13 and an inlet water level control valve 12. The level control valve 12 and the level gauge 13 form a level regulation and control loop.

[0033] More preferably, the outlet of the gas-liquid separator 11 is connected to the injection pump 14, and the outlet of the injection pump 14 is connected to the inlet pipeline of the expander generator 10.

[0034] Inside the hydrogenation tower 18, hydrogen reacts with anthraquinone in the working fluid. At the top of the tower, a large amount of unreacted hydrogen, nitrogen, and some working fluid solvent components in a gaseous phase (temperature 60-70°C) are present. This gaseous phase is sent to the heat exchanger 17 via the circulating gas compressor 23 to heat the hydrogen. The hydrogenation liquid in the hydrogenation tower 18 has its level controlled by the level regulating valve 20 to maintain stability at level 19. The hydrogenation liquid entering the hydrogenation liquid storage tank 21 also contains a large amount of unreacted hydrogen, nitrogen, and some working fluid solvent components in a gaseous phase (temperature 55-65°C). This gaseous phase is sent to the inlet of the circulating gas compressor 23 via the tail gas compressor 22 and also enters the heat exchanger 17 to heat the hydrogen. The gas exiting the heat exchanger 17 returns to the hydrogen main pipe and is recycled back into the hydrogenation tower.

[0035] First, the gases in the original hydrogenation tower 18 and hydrogenation liquid storage tank 21 were vented, resulting in the loss of nitrogen, hydrogen, and some solvent. Second, these gases were at a relatively high temperature, and this process can recover the heat from the gases.

[0036] Case 1: Hydrogen pressure is 3.4~3.5MPa, and the hydrogen flow rate of the second flow meter 4 is controlled by flow regulating valve 5 to be 20000Nm. 3 / h, hot water at 120~130℃ (waste hot water from the steam condensation system) is used to control the temperature of the expander inlet thermometer 9 to 85℃, the expander outlet thermometer 15 to 25℃ and the third pressure gauge 16 to 0.5MPa via temperature regulating valve 7, and the power generation of hydrogen expander generator 10 is 350kW.

[0037] Case 2: Hydrogen pressure is 2.9~3.0 MPa, and the hydrogen flow rate of the second flow meter 4 is controlled by flow regulating valve 5 to be 15000 Nm³. 3 / h, the expander inlet thermometer 9 is controlled at 70℃, the expander outlet thermometer 15 at 27℃ and the third pressure gauge 16 at 0.5MPa by 0.3MPa steam (steam generated from waste heat boiler) through temperature regulating valve 7, and the third pressure gauge 16 at 0.5MPa. The power generation of hydrogen expander generator 10 is 180kW.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A hydrogen peroxide high-pressure feedstock hydrogen energy recovery system, characterized in that, The hydrogen pipeline is connected to the first flow meter (1), which is connected to the pressure reducing valve (2) and the first pressure gauge (3) in sequence through the pipeline, forming a high-pressure hydrogen direct pressure reduction process; the hydrogen pipeline is also connected to the second flow meter (4) through the pipeline, which is connected to the flow regulating valve (5), the hydrogen circulating gas heat exchanger (17), the heater (6), the hydrogen expansion generator (10), the gas-liquid separator (11) and the hydrogen discharge pipeline through the pipeline; the hydrogen pipeline is also connected to the hydrogen refueling tower (18), the circulating gas compressor (23) and the hydrogen circulating gas heat exchanger (17) in sequence through the pipeline; the bottom of the hydrogen refueling tower (18) is connected to the hydrogen liquid storage tank (21), the hydrogen liquid storage tank tail gas compressor (22) and the circulating gas compressor (23) in sequence through the pipeline; the hydrogen refueling tower (18) is provided with anthraquinone inlet pipe.

2. The hydrogen peroxide high-pressure feedstock hydrogen energy recovery system according to claim 1, characterized in that: The hydrogenation tower (18) is equipped with a hydrogenation tower level gauge (19) and a hydrogenation tower level regulating valve (20).

3. The hydrogen peroxide high-pressure feedstock hydrogen energy recovery system according to claim 1, characterized in that: The heater (6) is equipped with a temperature regulating valve (7) on the medium inlet pipe and an expander inlet thermometer (9) on the outlet pipe of the heater (6). The temperature regulating valve (7) controls the expander inlet thermometer (9).

4. The hydrogen peroxide high-pressure feedstock hydrogen energy recovery system according to claim 1, characterized in that: The hydrogen expander generator (10) is equipped with an expander inlet thermometer (9) and a second pressure gauge (8).

5. The hydrogen peroxide high-pressure feedstock hydrogen energy recovery system according to claim 1, characterized in that: The outlet of the gas-liquid separator (11) is equipped with an expander outlet thermometer (15) and a third pressure gauge (16).

6. The hydrogen peroxide high-pressure feedstock hydrogen energy recovery system according to claim 1, characterized in that: The gas-liquid separator (11) is equipped with a level gauge (13) and an inlet water level control valve (12).

7. The hydrogen peroxide high-pressure feedstock hydrogen energy recovery system according to claim 1, characterized in that: The outlet of the gas-liquid separator (11) is connected to the spray pump (14), and the outlet of the spray pump (14) is connected to the inlet pipeline of the expansion generator (10).

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