CN116850630A - Hydrogen peroxide hydrogenated liquid storage tank analysis gas recovery device, method and hydrogen peroxide preparation system - Google Patents

Abstract

The invention provides a hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device, a method and a hydrogen peroxide preparation system. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device includes: a hydrogenation liquid storage tank; a first pressure sensor located on the hydrogenation liquid storage tank , used to detect the pressure in the hydrogenation liquid storage tank and generate the first pressure signal; the condenser, its hot fluid side inlet is connected to the top of the hydrogenation liquid storage tank; the water seal tank is connected to the heat of the condenser through the first branch The fluid side gas outlet is connected; the exhaust gas recovery tank is connected to the hot fluid side gas outlet of the condenser through the second branch; the second pressure sensor is located on the exhaust gas recovery tank and is used to detect the pressure in the exhaust gas recovery tank; release gas The cut-off valve is located on the second branch; the control unit is electrically connected to the first pressure sensor, the second pressure sensor and the release gas cut-off valve. The control unit controls the opening of the release gas cut-off valve according to the first pressure signal. The invention can reduce the waste of raw material hydrogen and improve the working environment.

Description

Hydrogen peroxide hydrogenated liquid storage tank analysis gas recovery device, method and hydrogen peroxide preparation system

Technical field

The invention relates to the field of chemical engineering technology, and in particular to a hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device, method and hydrogen peroxide preparation system.

Background technique

Industrial-scale hydrogen peroxide (H ₂ O ₂ ) production mainly adopts the anthraquinone method, which uses anthraquinone as the solute and is mixed with organic solvents in a certain proportion to form a working solution. Under certain temperature and pressure conditions with a catalyst, hydrogen gas is introduced to carry out the hydrogenation reaction to obtain the corresponding hydroanthraquinone solution, commonly known as hydrogenation liquid. The generated hydrogenation liquid enters the hydrogenation liquid storage tank. In the subsequent oxidation process, the hydrogenation liquid It undergoes an oxidation reaction with oxygen in the air at a certain temperature and pressure, and then obtains a hydrogen peroxide aqueous solution product with a mass fraction of 27.5 to 38% through extraction, purification, and purification.

The existing anthraquinone-based hydrogen peroxide production process has problems such as high raw material consumption and unfriendly operating environment.

Contents of the invention

In view of the above technical problems existing in the prior art, the present invention provides a high hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device, method and hydrogen peroxide preparation system, which can reduce the waste of raw materials.

On the one hand, embodiments of the present invention provide a hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device, including:

Hydrogenated liquid storage tank, which is used to store hydrogenated liquid;

A first pressure sensor located on the hydrogenation liquid storage tank, the first pressure sensor is used to detect the pressure in the hydrogenation liquid storage tank and generate a first pressure signal;

A condenser with a hot fluid side inlet connected to the top of the hydrogenated liquid storage tank, and a hot fluid side liquid outlet of the condenser connected with the hydrogenated liquid storage tank;

A water seal tank is connected to the hot fluid side gas outlet of the condenser through a first branch. A first vent pipe is provided on the water seal tank, and a pressure control valve is provided on the first vent pipe. ;

An exhaust gas recovery tank, which is connected to the hot fluid side gas outlet of the condenser through a second branch;

At least two second pressure sensors are provided on the exhaust gas recovery tank, the second pressure sensors are used to detect the pressure in the exhaust gas recovery tank and generate a second pressure signal;

A release gas cut-off valve located on the second branch;

A control unit electrically connected to the first pressure sensor, the second pressure sensor and the release gas cut-off valve, and the control unit sends control to the release gas cut-off valve according to the received first pressure signal. signal to control the opening of the release gas shut-off valve.

In an optional embodiment, the recovery device further includes: an exhaust gas compressor, the input end of which is connected to the exhaust gas recovery tank. The exhaust gas compressor is electrically connected to the control unit and is used to transfer the exhaust gas into the exhaust gas recovery tank. gas compression; a third pressure sensor, located close to the exhaust gas compressor, is used to detect the pressure at the outlet of the exhaust gas compressor and generate a third pressure signal. The third pressure sensor is electrically connected to the control unit. Connection to transmit the third pressure signal to the control unit; a circulating hydrogen pipeline connected to the output end of the tail gas compressor for transporting compressed gas to a hydrogen supply device for preparing hydrogen peroxide; an outlet A cut-off valve is provided on the circulating hydrogen pipeline, the outlet cut-off valve is electrically connected to the control unit, and the control unit responds to the start and stop of the exhaust gas compressor, the third pressure signal and the third pressure signal. Two pressure signals send control signals to the outlet cut-off valve to control the opening of the outlet cut-off valve; an exhaust gas return pipe, which is respectively connected to the output end of the exhaust gas compressor and the exhaust gas recovery tank; a return flow regulating valve, It is located on the exhaust gas return pipe, and the return regulating valve is electrically connected to the control unit. The control unit sends a signal to the return regulating valve according to the start and stop of the exhaust gas compressor and the second pressure signal. Control signal to control the opening of the backflow regulating valve.

In an optional embodiment, when the exhaust gas compressor stops or at least one of at least two second pressure sensors detects that the pressure in the exhaust gas recovery tank is ≤0.5Kpa, the control unit controls the return flow adjustment. The valve is opened, and the outlet cut-off valve is controlled to be closed; the exhaust gas compressor is started, the third pressure sensor detects that the pressure at the outlet of the exhaust gas compressor is ≥ 100KPa, and at least two of the second pressure sensors When at least one detects that the pressure in the exhaust gas recovery tank is ≥1.0Kpa, the outlet shut-off valve is opened.

In an optional embodiment, the recovery device further includes: a nitrogen source, which is used to provide nitrogen; a first nitrogen supplementary pipe, which is respectively connected to the nitrogen source and the hydrogenation liquid storage tank; a nitrogen regulating valve, which is located at On the first nitrogen replenishing pipe, the nitrogen regulating valve is electrically connected to the control unit, and the control unit controls the opening of the nitrogen regulating valve according to the pressure signal detected by the first pressure sensor; a nitrogen supply pipe, which is connected to the nitrogen source and the tail gas recovery tank respectively; a nitrogen cut-off valve, which is located on the second nitrogen supply pipe; the nitrogen cut-off valve is electrically connected to the control unit; the nitrogen cut-off valve is electrically connected to the control unit; The control unit controls the opening of the nitrogen regulating valve and the nitrogen cut-off valve according to the pressure signal detected by the second pressure sensor.

In an optional embodiment, when at least one of the at least two second pressure sensors detects that the pressure in the exhaust gas recovery tank is ≤1.0Kpa, the nitrogen cut-off valve opens; at least two of the second pressure sensors When at least one of them detects that the pressure in the exhaust gas recovery tank is ≥2.0Kpa, the nitrogen cut-off valve is closed.

In an optional embodiment, when the first pressure sensor detects that the pressure in the hydrogenated liquid storage tank is ≤0.5Kpa, the release gas cut-off valve is closed; the first pressure sensor detects that the hydrogenated liquid storage tank When the pressure is ≥1.0Kpa, the release gas cut-off valve opens.

In an optional embodiment, the exhaust gas recovery tank is provided with a second vent pipe, the second vent pipe is provided with a vent valve group, and the vent valve group is electrically connected to the control unit.

In an optional embodiment, when at least one of the at least two second pressure sensors detects that the pressure of the exhaust gas recovery tank is ≥8.0Kpa, the vent valve group opens 50%; at least two of the second pressure sensors When at least one of the sensors detects that the pressure in the exhaust gas recovery tank is ≥10Kpa, the vent valve group opens 100%; at least one of the at least two second pressure sensors detects the pressure in the exhaust gas recovery tank. When ≤5Kpa, the vent valve group is closed.

In a second aspect, embodiments of the present invention provide a method for recovering desorbed gas from a hydrogen peroxide hydrogenated liquid storage tank. The method adopts the desorbed gas recovery device from a hydrogen peroxide hydrogenated liquid storage tank described in any of the above embodiments.

In a third aspect, embodiments of the present invention provide a hydrogen peroxide preparation system, including a hydrogenation tower, a hydrogen supply device connected to the hydrogenation tower, and a hydrogenation liquid storage tank connected to the hydrogenation tower, and also includes any of the above embodiments. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device.

In the hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device provided by the embodiment of the present invention, a condenser is used to cool the analysis gas generated by the hydrogenation liquid storage tank, and the water seal tank liquid seals the hydrogenation liquid storage tank to avoid hydrogenation liquid storage. If the tank pressure is too low, the tail gas recovery tank can recover the analytical gas generated by the hydrogenation liquid storage tank. The recovered hydrogen-containing tail gas can be used as raw material to return to the hydrogenation reaction part generated by hydrogen peroxide. The hydrogen in the gas released from the hydrogenation liquid storage tank can be recovered and recycled. Using it saves raw material hydrogen, reduces hydrogen consumption in hydrogen peroxide production, and avoids environmental impact due to the release of gas.

Description of the drawings

In the drawings, which are not necessarily to scale, the same reference numbers may describe similar components in the different views. The same reference number with a letter suffix or different letter suffixes may refer to different instances of similar components. The drawings illustrate various embodiments generally by way of example and not limitation, and together with the description and claims serve to explain the disclosed embodiments. Where appropriate, the same reference numbers will be used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the apparatus or method.

Figure 1 is a schematic structural diagram of a hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to an embodiment of the present invention.

In the picture: 1-Hydrogenated liquid storage tank; 2-Water seal tank; 3-Tail gas recovery tank; 4-Tail gas compressor; 5-Condenser; 6-Nitrogen regulating valve; 7-Nitrogen cut-off valve; 8-Release gas cut-off valve; 9-venting valve group; 10-return regulating valve; 11-first pressure sensor; 12-second pressure sensor; 13-first liquid level gauge; 14-on-site pressure sensor; 15-third pressure sensor; 16 -Outlet shut-off valve; 17-Outlet flow meter; 18-Outlet flow display remote transmission mechanism; 19-Second liquid level gauge; 20-First branch; 21-First vent pipe; 22-Pressure control valve; 23 -Second branch; 24-circulating hydrogen pipeline; 25-exhaust gas return pipe; 26-nitrogen source; 27-first nitrogen supplement pipe; 28-second nitrogen supplement pipe; 29-second vent pipe; 30-manual Valve; 31-valve circuit; 32-valve pipeline.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the drawings and specific implementation modes. The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and specific examples, but this is not intended to limit the present invention.

"First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. Similar words such as "include" or "include" mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also covering other elements. "Up", "down", "left", "right", etc. are only used to express relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may not be directly connected to the other device but with an intervening device.

All terms (including technical terms or scientific terms) used in the present invention have the same meanings as understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be construed to have meanings consistent with their meanings in the context of the relevant technology and should not be interpreted in an idealized or highly formalized sense, except as expressly stated herein. Define it this way.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered a part of the specification.

Referring to Figure 1, an embodiment of the present invention provides a device for recovering desorbed gas from a hydrogen peroxide hydrogenation liquid storage tank 1, including a hydrogenation liquid storage tank 1, a first pressure sensor 11, a condenser 5, a water seal tank 2, and an exhaust gas recovery tank 3. The second pressure sensor 12, the release gas shut-off valve 8 and the control unit.

The hydrogenation liquid storage tank 1 is used to store hydrogenation liquid. The first pressure sensor 11 is provided on the hydrogenation liquid storage tank 1. The first pressure sensor 11 is used to detect the pressure in the hydrogenation liquid storage tank 1. The first pressure sensor 11 detects the pressure in the hydrogenation liquid storage tank 1. The pressure generates a first pressure signal, and the hot fluid side inlet of the condenser 5 is connected to the top of the hydrogenation liquid storage tank 1 to cool the desorbed gas generated in the hydrogenation liquid storage tank 1 . The water seal tank 2 is connected to the hot fluid side gas outlet of the condenser 5 through the first branch 20. The water seal tank 2 is provided with a first vent pipe 21, and the first vent pipe 21 is provided with a pressure control valve 22. When the desorbed gas generated in the hydrogenation liquid storage tank 1 is less, the hydrogenation liquid storage tank 1 is water-sealed through the water sealing tank 2 .

The exhaust gas recovery tank 3 is connected to the hot fluid side gas outlet of the condenser 5 through the second branch 23. The analyzed gas is cooled by the condenser 5 and then enters the exhaust gas recovery tank 3 for recovery. The second pressure sensor 12 is provided on the exhaust gas recovery tank 3. The second pressure sensor 12 is used to detect the pressure in the exhaust gas recovery tank 3. The second pressure sensor 12 generates a second pressure signal according to the detected pressure. The release gas shut-off valve 8 is provided on the second branch 23 . The release gas cut-off valve 8 is used to cut off or connect the exhaust gas recovery tank 3 and the condenser 5. For example, when the hydrogenation liquid storage tank 1 generates less analytical gas, the release gas cut-off valve 8 can be cut off and the water seal is used. Tank 2 performs water sealing on hydrogenation liquid storage tank 1. There are at least two second pressure sensors 12. At least two second pressure sensors 12 are provided to detect the pressure of the exhaust gas recovery tank 3, so that joint control can be performed in a timely manner to avoid negative pressure.

The control unit is electrically connected to the first pressure sensor 11, the second pressure sensor 12 and the release gas cut-off valve 8. The control unit sends a control signal to the release gas cut-off valve 8 according to the received first pressure signal to control the release gas cut-off valve 8. opening.

The anthraquinone hydrogen peroxide production process uses hydrogen as raw material. Under certain pressure conditions, the hydrogen reacts with an anthraquinone-containing organic solution under the action of a palladium catalyst in the hydrogenation tower. The solution after the reaction is commonly known as a hydrogenation liquid. The hydrogenated liquid generated by the reaction enters the hydrogenation liquid. Storage tank 1, during the reaction process, some hydrogen will be dissolved into the hydrogenation liquid. Since the hydrogenation liquid storage tank 1 is a normal pressure device, the hydrogen dissolved in the hydrogenation liquid will be desorbed. On-site venting will not only cause high hydrogen consumption, but also cause high hydrogen consumption due to the release of hydrogen. The venting of gas will carry some organic matter and have a certain impact on the operating environment.

In the embodiment of the present invention, the condenser 5 is used to cool the desorbed gas generated by the hydrogenation liquid storage tank 1, and the water seal tank 2 performs liquid sealing on the hydrogenation liquid storage tank 1 to prevent the pressure of the hydrogenation liquid storage tank 1 from being too low and the tail gas recovery tank 3. The analytical gas generated by the hydrogenation liquid storage tank 1 can be recovered. The recovered hydrogen-containing tail gas can be used as a raw material to return to the hydrogenation reaction part generated by hydrogen peroxide. The hydrogen in the gas released from the hydrogenation liquid storage tank 1 can be recovered and recycled, saving raw material hydrogen. , reducing the hydrogen consumption of hydrogen peroxide production, and avoiding the impact of the released gas on the environment.

In the embodiment of the present invention, the liquid outlet on the hot fluid side of the condenser 5 is connected to the hydrogenation liquid storage tank 1, and the liquid after condensation of the analytical gas is returned to the hydrogenation liquid storage tank 1, thereby reducing hydrogenation liquid loss and environmental pollution.

The recovery device of the embodiment of the present invention can be used in a hydrogen peroxide preparation system. The hydrogen peroxide preparation system includes a hydrogenation tower, a hydrogen supply device connected to the hydrogenation tower, and a hydrogenation liquid storage tank 1 connected to the hydrogenation tower. The hydrogen supply device supplies hydrogen into the hydrogenation tower. The hydrogen reacts with the anthraquinone-containing organic solution under the action of the palladium catalyst in the hydrogenation tower. The solution after the reaction is called hydrogenation liquid. The hydrogenation liquid storage tank 1 is used to accommodate the hydrogenation liquid generated by the reaction. The tail gas recovery tank 3 in the recovery device can be connected to the hydrogen supply device, so that the hydrogen-containing released gas recovered in the tail gas recovery tank 3 can be returned to the hydrogen supply device and transported as raw material to the hydrogenation tower for reaction, thereby reducing hydrogen consumption in hydrogen peroxide production. And it avoids the environmental impact caused by the release of gas.

In some embodiments, the desorbed gas recovery device of the hydrogen peroxide hydrogenation liquid storage tank 1 also includes an exhaust gas compressor 4, a third pressure sensor 15, a circulating hydrogen pipeline 24, an outlet shut-off valve 16, an exhaust gas return pipe 25 and a return flow regulating valve 10. The input end of the exhaust gas compressor 4 is connected to the exhaust gas recovery tank 3. The exhaust gas compressor 4 is electrically connected to the control unit and is used to compress the gas in the exhaust gas recovery tank 3. The released gas in the exhaust gas recovery tank 3 can be pressurized by the exhaust gas compressor 4 and then sent to the hydrogen supply device as raw material. The third pressure sensor 15 is disposed close to the exhaust gas compressor 4 and is used to detect the pressure at the outlet of the exhaust gas compressor 4 . The pressure signal generated by the third pressure sensor 15 may be called a third pressure signal. The third pressure sensor 15 is electrically connected to the control unit to transmit the third pressure signal to the control unit. The control unit can obtain the pressure in the exhaust gas recovery tank 3 in real time based on the third pressure signal. The circulating hydrogen pipeline 24 is connected to the output end of the tail gas compressor 4 and is used to transport the compressed gas to a hydrogen supply device for preparing hydrogen peroxide. The analyzed gas pressurized by the tail gas compressor 4 returns to the hydrogen supply device through the circulating hydrogen pipeline 24 to realize the utilization of the hydrogen raw material in the analyzed gas. The outlet cut-off valve 16 is provided on the circulating hydrogen pipeline 24, and the outlet cut-off valve 16 is electrically connected to the control unit, so that the control unit controls the opening of the outlet cut-off valve 16. The control unit may send a control signal to the outlet cut-off valve 16 according to the start and stop of the exhaust gas compressor 4, the third pressure signal and the second pressure signal to control the opening of the outlet cut-off valve 16. The exhaust gas return pipe 25 is connected to the output end of the exhaust gas compressor 4 and the exhaust gas recovery tank 3 respectively. The exhaust gas return pipe 25 can be provided to prevent the pressure in the exhaust gas recovery tank 3 from being too low. The backflow regulating valve 10 is disposed on the exhaust gas return pipe 25 , and the backflow regulating valve 10 is electrically connected to the control unit, so that the control unit controls the opening of the backflow regulating valve 10 . The control unit may send a control signal to the backflow regulating valve 10 according to the start and stop of the exhaust gas compressor 4 and the second pressure signal to control the opening of the backflow regulating valve 10.

The input end and the output end of the exhaust gas compressor 4 are connected through a valve pipeline 32. Before the exhaust gas compressor 4 is started, the input end and the output end can be connected through the valve pipeline 32.

In some embodiments, when the exhaust gas compressor 4 stops or at least one of the at least two second pressure sensors 12 detects that the pressure in the exhaust gas recovery tank 3 is less than or equal to the first threshold, the control unit controls the backflow regulating valve 10 to open and controls the outlet. The cut-off valve 16 is closed; the exhaust gas compressor 4 is started, the third pressure sensor 15 detects that the pressure at the outlet of the exhaust compressor 4 is greater than or equal to the second threshold, and at least one of the at least two second pressure sensors 12 detects the exhaust gas recovery tank. When the pressure in 3 is greater than or equal to the third threshold, the outlet cut-off valve 16 is opened. The third threshold is greater than the first threshold. In an exemplary embodiment, the first threshold is 0.5Kpa, the second threshold is 100KPa, and the third threshold is 1.0Kpa. In the embodiment of the present invention, the pressure in the hydrogenation liquid storage tank 1 is controlled at about 5KPa (G). During production, the tail gas compressor 4 is shut down and the pressure in the tail gas recovery tank is ≤ 0.5 Kpa (G). If one of the conditions is met, the reflux The regulating valve 10 is opened, the outlet shut-off valve 16 is closed, and the air supply is stopped. Setting the control pressure of the exhaust gas recovery tank 3 to ≤0.5Kpa (G) triggers the opening of the backflow regulating valve 10, which can prevent the system from negative pressure due to untimely nitrogen replenishment during the operation of the exhaust gas compressor 4, which affects safe operation. Start the tail gas compressor 4 and set the outlet pressure of the tail gas compressor 4 to ≥100KPa to meet the pressure requirements for the hydrogen-containing analytical gas to be returned to the hydrogen supply device; set the pressure in the tail gas recovery tank 3 to ≥1.0Kpa (G) to prevent the pressure from being too low. , to avoid abnormalities in the compressor, excessive air pumping, and negative pressure, and to ensure the safe and stable operation of the recovery device.

In some embodiments, the recovery device further includes a nitrogen source 26 , a first nitrogen supplementary pipe 27 , a nitrogen regulating valve 6 , a second nitrogen supplementary pipe 28 and a nitrogen cutoff valve 7 . Nitrogen source 26 is used to provide nitrogen. The first nitrogen supplement pipe 27 is connected to the nitrogen source 26 and the hydrogenation liquid storage tank 1 respectively. The nitrogen regulating valve 6 is provided on the first nitrogen replenishing pipe 27 . The nitrogen regulating valve 6 is electrically connected to the control unit. The control unit controls the opening of the nitrogen regulating valve 6 according to the pressure signal detected by the first pressure sensor 11 . The second nitrogen replenishment pipe 28 is connected to the nitrogen source 26 and the tail gas recovery tank 3 respectively. The nitrogen cut-off valve 7 is provided on the second nitrogen replenishment pipe 28. The nitrogen cut-off valve 7 is electrically connected to the control unit. The control unit detects according to the second pressure sensor 12. The pressure signal controls the opening of the nitrogen regulating valve 6 and the nitrogen cut-off valve 7.

In some embodiments, when at least one of the at least two second pressure sensors 12 detects that the pressure in the exhaust gas recovery tank 3 is less than or equal to the fourth threshold, the nitrogen cut-off valve 7 is opened. When at least one of the at least two second pressure sensors 12 detects that the pressure in the exhaust gas recovery tank 3 is greater than or equal to the fifth threshold, the nitrogen cut-off valve 7 is closed. The fifth threshold is greater than the fourth threshold. In an exemplary embodiment, the fourth threshold is 1.0Kpa, and the fifth threshold is 2.0Kpa. Setting the nitrogen cut-off valve 7 to open when the pressure in the exhaust gas recovery tank 3 is ≤1.0Kpa (G) can avoid negative pressure in the entire system of the exhaust gas recovery tank 3 and the recovery device. When the pressure in the exhaust gas recovery tank 3 is less than or equal to 1.0Kpa, the nitrogen cut-off valve 7. Open the exhaust gas recovery tank 3 and add nitrogen to maintain the pressure. When the nitrogen supply reaches a certain condition, the nitrogen cut-off valve 7 needs to be closed. When the pressure of the tail gas recovery tank 3 is greater than or equal to 2.0Kpa, there is no need to supplement nitrogen and the nitrogen cut-off valve 7 is closed. Prevent excessive nitrogen from affecting the compressor output and the gas composition requirements of the subsequent system.

In some embodiments, when the first pressure sensor 11 detects that the pressure in the hydrogenation liquid storage tank 1 is less than or equal to the sixth threshold, the release gas cut-off valve 8 is closed; the first pressure sensor 11 detects that the pressure in the hydrogenation liquid storage tank 1 is greater than or equal to At the seventh threshold, the release gas cut-off valve 8 is opened. The seventh threshold is greater than the sixth threshold. In the exemplary embodiment, the sixth threshold is 0.5Kpa and the seventh threshold is 1.0Kpa. Under normal circumstances, the pressure of the hydrogenation liquid storage tank 1 is controlled at about 5Kpa (G). When the pressure is too low and the set pressure is lower than 0.5Kpa (G), the release gas cut-off valve 8 is closed, and the release gas passes through the water seal tank 2 Short. Prevent the pressure of the hydrogenated liquid storage tank 1 from being too low and causing negative pressure. When the pressure of the hydrogenated liquid storage tank 1 reaches ≥1.0Kpa (G), the release gas cut-off valve 8 is opened, and the gas is supplied to the exhaust gas recovery tank 3, so that it is pressurized by the exhaust gas compressor 4 and sent to the subsequent system. This can avoid negative pressure in the hydrogenation liquid storage tank 1 and at the same time meet the normal operating pressure requirements.

In some embodiments, the exhaust gas recovery tank 3 is provided with a second vent pipe 29 , the second vent pipe 29 is provided with a vent valve group 9 , and the vent valve group 9 is electrically connected to the control unit.

In some embodiments, when at least one of the at least two second pressure sensors 12 detects that the pressure of the exhaust gas recovery tank 3 is greater than or equal to the eighth threshold, the vent valve group 9 opens 50%; When at least one detects that the pressure in the exhaust gas recovery tank 3 is greater than or equal to the ninth threshold, the vent valve group 9 is opened 100%; at least one of the at least two second pressure sensors 12 detects that the pressure in the exhaust gas recovery tank 3 is less than or equal to the tenth threshold. At the threshold, the vent valve group 9 is closed. The eighth threshold is less than the ninth threshold by 10Kpa, and the tenth threshold is less than the eighth threshold. In the exemplary embodiment, the eighth threshold is 8.0Kpa, the ninth threshold is 10Kpa, and the tenth threshold is 5Kpa. Because the pressure of the hydrogenated liquid storage tank 1 is controlled at around 5.0Kpa (G) under normal circumstances, the pressure of the exhaust gas recovery tank 3 is too high, which affects the pressure control of the hydrogenated liquid storage tank 1, thereby affecting the feed of the hydrogenated liquid storage tank 1, and at the same time, the exhaust gas recovery tank 3. The pressure is too high, which affects the increase in the compressor outlet pressure and may affect subsequent gas use. The opening of the vent valve group 9 is controlled according to the pressure in the exhaust gas recovery tank 3 to avoid pumping out and overpressure.

In the embodiment of the present invention, there are at least two second pressure sensors 12. When the pressure detected by at least one second pressure sensor 12 meets the control condition, the corresponding valve action will be caused. For example, when two second pressure sensors 12 are provided, the opening of the corresponding valve can be adjusted if the pressure detected by any one of them meets the conditions. Alternatively, three second pressure sensors 12 are provided, and if any two of them detect that the pressure meets the conditions, the opening of the corresponding valve can be adjusted. Can reduce malfunctions.

In some embodiments, manual valves 30 are respectively provided on both sides of the return regulating valve 10. The two manual valves 30 and the return regulating valve 10 form a return valve group, and a valve circuit 31 is connected in parallel to the return valve group. By setting up a valve bypass, when the backflow regulating valve 10 fails, the manual valves 30 on the left and right sides can be closed and the valve bypass can be opened to repair the backflow regulating valve 10 to avoid downtime.

In the embodiment of the present invention, the exhaust gas recovery tank 3 is also provided with an on-site pressure sensor 14. The hydrogenation liquid storage tank 1 is provided with a first liquid level gauge 13 . The water seal tank 2 is provided with a second liquid level gauge 19 . The circulating hydrogen pipeline 24 is provided with an outlet flow meter 17 and an outlet flow display remote transmission mechanism 18.

Embodiments of the present invention provide a method for recovering desorbed gas from hydrogen peroxide hydrogenated liquid storage tank 1. The method adopts the desorbed gas recovery device from hydrogen peroxide hydrogenated liquid storage tank 1 of any of the above embodiments.

The embodiment of the present invention provides a hydrogen peroxide preparation system, which includes a hydrogenation tower, a hydrogen supply device connected to the hydrogenation tower, and a hydrogenation liquid storage tank 1 connected to the hydrogenation tower. The hydrogen peroxide preparation system of the embodiment of the present invention also includes any of the above implementations. The hydrogen peroxide hydrogenated liquid storage tank 1 and analytical gas recovery device described in the example.

The working process of the recovery device according to the embodiment of the present invention will be described below with examples.

Example 1

The first pressure sensor 11 detects that the pressure of the hydrogenated liquid storage tank 1 is 1.7Kpa. After the released gas from the hydrogenated liquid storage tank 1 is condensed and recovered part of the organic matter by the condenser 5, it enters the tail gas recovery tank 3 for buffering through the released gas cut-off valve 8, and then passes through The exhaust gas compressor 4 pressurizes the exhaust gas to 0.25MPa and sends it to the circulating hydrogen pipeline 24.

Example 2

The first pressure sensor 11 detects that the pressure of the hydrogenated liquid storage tank 1 is 0.4Kpa, the nitrogen regulating valve 6 is opened, nitrogen enters the hydrogenated liquid storage tank 1, the release gas cut-off valve 8 is closed, and the released gas enters the water sealing tank 2. The first pressure sensor 11 detects that the pressure of the hydrogenated liquid storage tank 1 is 0.5Kpa, the nitrogen regulating valve 6 is closed, the first pressure sensor 11 detects that the pressure of the hydrogenated liquid storage tank 1 is 1.0Kpa, and the release gas cut-off valve 8 is opened. The released exhaust gas enters the exhaust gas recovery tank 3 for buffering through the release gas cut-off valve 8, and is then pressurized to 0.25MPa through the exhaust gas compressor 4 and sent to the circulating hydrogen pipeline 24.

The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the present invention.

Claims (10)

1. A hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device, which is characterized in that it includes: Hydrogenated liquid storage tank, which is used to store hydrogenated liquid; A first pressure sensor located on the hydrogenation liquid storage tank, the first pressure sensor is used to detect the pressure in the hydrogenation liquid storage tank and generate a first pressure signal; A condenser with a hot fluid side inlet connected to the top of the hydrogenated liquid storage tank, and a hot fluid side liquid outlet of the condenser connected with the hydrogenated liquid storage tank; A water seal tank is connected to the hot fluid side gas outlet of the condenser through a first branch. A first vent pipe is provided on the water seal tank, and a pressure control valve is provided on the first vent pipe. ; An exhaust gas recovery tank, which is connected to the hot fluid side gas outlet of the condenser through a second branch; At least two second pressure sensors are provided on the exhaust gas recovery tank, the second pressure sensors are used to detect the pressure in the exhaust gas recovery tank and generate a second pressure signal; A release gas cut-off valve located on the second branch; A control unit electrically connected to the first pressure sensor, the second pressure sensor and the release gas cut-off valve, and the control unit sends control to the release gas cut-off valve according to the received first pressure signal. signal to control the opening of the release gas shut-off valve. 2. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to claim 1, characterized in that the recovery device further includes: An exhaust gas compressor, the input end of which is connected to the exhaust gas recovery tank, the exhaust gas compressor is electrically connected to the control unit, and is used to compress the gas in the exhaust gas recovery tank; A third pressure sensor is provided close to the exhaust gas compressor for detecting the pressure at the outlet of the exhaust gas compressor and generating a third pressure signal. The third pressure sensor is electrically connected to the control unit to The third pressure signal is transmitted to the control unit; A circulating hydrogen pipeline, which is connected to the output end of the tail gas compressor and is used to transport the compressed gas to a hydrogen supply device for preparing hydrogen peroxide; An outlet cut-off valve is provided on the circulating hydrogen pipeline. The outlet cut-off valve is electrically connected to the control unit. The control unit is based on the start and stop of the exhaust gas compressor, the third pressure signal and the The second pressure signal sends a control signal to the outlet cut-off valve to control the opening of the outlet cut-off valve; Exhaust gas return pipes, which are respectively connected to the output end of the exhaust gas compressor and the exhaust gas recovery tank; A return regulating valve is provided on the exhaust gas return pipe. The return regulating valve is electrically connected to the control unit. The control unit sends a signal to the exhaust gas compressor according to the start and stop of the exhaust gas compressor and the second pressure signal. The backflow regulating valve sends a control signal to control the opening of the backflow regulating valve. 3. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to claim 2, characterized in that the exhaust gas compressor stops or at least one of at least two second pressure sensors detects the exhaust gas recovery tank. When the pressure inside is ≤0.5Kpa, the control unit controls the return regulating valve to open and the outlet cut-off valve to close; The exhaust gas compressor starts, the third pressure sensor detects the pressure at the outlet of the exhaust gas compressor ≥ 100KPa, and at least one of the two second pressure sensors detects the pressure in the exhaust gas recovery tank. When ≥1.0Kpa, the outlet shut-off valve opens. 4. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to claim 1, characterized in that the recovery device further includes: A nitrogen source for providing nitrogen; A first nitrogen replenishment pipe, which is respectively connected to the nitrogen source and the hydrogenation liquid storage tank; A nitrogen regulating valve is provided on the first nitrogen replenishing pipe. The nitrogen regulating valve is electrically connected to the control unit. The control unit controls the nitrogen according to the pressure signal detected by the first pressure sensor. Regulate the opening of the valve; a second nitrogen supplementary pipe, which is respectively connected to the nitrogen source and the tail gas recovery tank; Nitrogen cut-off valve, which is provided on the second nitrogen supplement pipe. The nitrogen cut-off valve is electrically connected to the control unit. The control unit controls the nitrogen regulating valve according to the pressure signal detected by the second pressure sensor. and the opening of the nitrogen cut-off valve. 5. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to claim 4, characterized in that at least one of at least two second pressure sensors detects that the pressure in the tail gas recovery tank is ≤1.0Kpa. , the nitrogen cut-off valve opens; When at least one of at least two second pressure sensors detects that the pressure in the exhaust gas recovery tank is ≥2.0Kpa, the nitrogen cut-off valve is closed. 6. The hydrogen peroxide hydrogenation liquid storage tank analytical gas recovery device according to claim 1, characterized in that, when the first pressure sensor detects that the pressure in the hydrogenation liquid storage tank is ≤0.5Kpa, the released gas is cut off. valve closed; When the first pressure sensor detects that the pressure of the hydrogenated liquid storage tank is ≥1.0Kpa, the release gas cut-off valve opens. 7. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to claim 1, characterized in that the exhaust gas recovery tank is provided with a second vent pipe, and the second vent pipe is provided with a vent valve group. , the vent valve group is electrically connected to the control unit. 8. The hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device according to claim 7, characterized in that, When at least one of the two second pressure sensors detects that the pressure of the exhaust gas recovery tank is ≥8.0Kpa, the vent valve group opens 50%; When at least one of the two second pressure sensors detects that the pressure of the exhaust gas recovery tank is ≥10Kpa, the vent valve group opens 100%; When at least one of at least two second pressure sensors detects that the pressure in the exhaust gas recovery tank is ≤5Kpa, the vent valve group is closed. 9. A method for recovering desorbed gas from a hydrogen peroxide hydrogenated liquid storage tank, which is characterized in that the desorbed gas recovery device from a hydrogen peroxide hydrogenated liquid storage tank described in any one of claims 1 to 8 is used. 10. A hydrogen peroxide preparation system, comprising a hydrogenation tower, a hydrogen supply device connected to the hydrogenation tower and a hydrogenation liquid storage tank connected to the hydrogenation tower, characterized in that it also includes the hydrogen peroxide storage tank according to any one of claims 1 to 8. The above-mentioned hydrogen peroxide hydrogenation liquid storage tank analysis gas recovery device.