An emergency material withdrawal system for an oxidation column

Abstract

The application discloses an emergency material removing system of an oxidation tower, and relates to the technical field of hydrogen peroxide production.The emergency material removing system comprises an oxidation tower, a temperature monitoring device, an emergency material removing pipe, an open liquid collecting pool, a phosphoric acid input device, a cooling device, a nitrogen gas input device, a low-temperature desalted water input device and a control unit.The temperature monitoring device is used for monitoring the temperature in the cavity of the oxidation tower.The one end of the emergency material removing pipe is communicated with the bottom of the oxidation tower, and the end is provided with an emergency material removing valve.The other end of the emergency material removing pipe is communicated with the open liquid collecting pool.The phosphoric acid input device is communicated with the emergency material removing pipe, and can input phosphoric acid into the emergency material removing pipe.The cooling device is arranged on the emergency material removing pipe, and can reduce the temperature of the oxidation liquid in the emergency material removing pipe.The nitrogen gas input device is communicated with the emergency material removing pipe, and can input nitrogen gas into the emergency material removing pipe.The low-temperature desalted water input device is communicated with the emergency material removing pipe, and can input low-temperature desalted water into the emergency material removing pipe.The control unit is electrically connected with the emergency material removing system.The emergency material removing system of the oxidation tower can avoid or reduce the decomposition of hydrogen peroxide during the emergency material removing process, improve the flash point of the working liquid, and prevent the flash explosion and combustion of the working liquid.

Description

Technical Field

[0001] This invention relates to the field of hydrogen peroxide production technology, and in particular to an emergency material withdrawal system for an oxidation tower. Background Technology

[0002] Hydrogen peroxide production primarily employs the anthraquinone process. A working fluid composed of two or more substances—2-ethylanthraquinone, 2-pentylanthraquinone, C9 aromatics, C10 aromatics, trioctyl phosphate, tetrabutylurea, acetate, and isobutylmethanol—reacts with hydrogen gas in the presence of a catalyst in the hydrogenation step to generate a hydrogenated liquid. This hydrogenated liquid is then injected with phosphoric acid and pumped into the oxidation tower of the oxidation step, where it reacts with oxygen from the air compressor to produce hydrogen peroxide. The hydrogenated liquid is then reduced to the working fluid, and the hydrogen peroxide generated in the oxidation tower dissolves in the working fluid. This hydrogen-peroxide-containing working fluid is commonly referred to as the oxidation liquid. During the oxidation step, the air that did not participate in the reaction (referred to as oxygen-deficient air, containing nitrogen and 6%–8% oxygen) is treated before being discharged into the atmosphere. The oxidizing solution is pumped into the extraction tower of the extraction process. Taking advantage of the fact that the solubility of hydrogen peroxide in demineralized water is much greater than that in the working solution, and that the working solution and the demineralized water are immiscible, the hydrogen peroxide is extracted using the demineralized water to obtain a hydrogen peroxide solution, commonly known as hydrogen peroxide.

[0003] Hydrogen peroxide generated in the oxidation tower dissolves in the working fluid. Once alkaline substances are introduced into the oxidation tower, the hydrogen peroxide in the oxidation liquid begins to decompose, releasing oxygen. If the oxygen is not removed in time, the pressure inside the oxidation tower will continue to rise and eventually exceed the pressure limit of the oxidation tower, causing an explosion. In order to prevent the oxidation tower from exceeding the pressure limit due to the decomposition of hydrogen peroxide, an emergency material withdrawal system must be installed at the bottom of the oxidation tower. Once the decomposition of hydrogen peroxide in the oxidation tower occurs, the emergency material withdrawal system should be activated immediately to urgently withdraw the hydrogen peroxide and working fluid in the oxidation tower to an open collection tank.

[0004] Existing emergency withdrawal systems remove hydrogen peroxide and working fluid from the oxidation tower via emergency withdrawal valves and pipes to an open collection tank. While this prevents the oxidation tower from exceeding its pressure limit and exploding, it merely transfers the risks of flash explosion and fire to the emergency withdrawal system. These systems lack measures to prevent further decomposition of hydrogen peroxide and cannot prevent the working fluid from burning in an oxygen-rich environment. Furthermore, in the event of hydrogen peroxide decomposition in the oxidation fluid and emergency withdrawal from the oxidation tower, the temperature of the oxidation fluid may exceed the flash point of the working fluid, greatly increasing the risk of flash explosion.

[0005] Therefore, how to provide an emergency material withdrawal system for an oxidation tower to prevent the continued decomposition of hydrogen peroxide in the withdrawn oxidant and to eliminate the risk of flash explosion and fire in the open collection tank after emergency material withdrawal is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an emergency material withdrawal system for an oxidation tower, which solves the technical problem that existing emergency material withdrawal systems lack measures to prevent the continued decomposition of hydrogen peroxide.

[0007] To achieve the above objectives, the present invention provides an emergency material withdrawal system for an oxidation tower, comprising:

[0008] The oxidation tower is equipped with an air inlet pipe, a hydrogenated liquid inlet pipe, an oxygen-deficient air outlet pipe, and an oxidized liquid outlet pipe that connect to the cavity.

[0009] A temperature monitoring device is installed on the oxidation tower to monitor the temperature inside the oxidation tower cavity in real time;

[0010] An emergency discharge pipe and an open collection tank are provided. One end of the emergency discharge pipe is connected to the bottom of the oxidation tower and is equipped with an emergency discharge valve. The other end is connected to the open collection tank.

[0011] A phosphoric acid input device is connected to the emergency discharge pipe, and phosphoric acid is input into the emergency discharge pipe when the phosphoric acid input device is working;

[0012] A cooling device is installed on the emergency discharge pipe. When the cooling device is working, the temperature of the oxidant in the emergency discharge pipe decreases.

[0013] A nitrogen input device is connected to the emergency discharge pipe, and nitrogen is input into the emergency discharge pipe when the nitrogen input device is working;

[0014] A low-temperature demineralized water input device is connected to the emergency discharge pipe. When the low-temperature demineralized water input device is working, it inputs low-temperature demineralized water into the emergency discharge pipe.

[0015] The control unit establishes signal connections with the emergency discharge valve, the temperature monitoring device, the phosphoric acid input device, the cooling device, the nitrogen input device, and the low-temperature demineralized water input device, respectively. The real-time monitoring value acquired by the temperature monitoring device is transmitted to the control unit. The control unit determines whether the real-time monitoring value has reached a preset value. When the real-time monitoring value reaches the preset value, the control unit controls the emergency discharge valve, the phosphoric acid input device, the cooling device, the nitrogen input device, and the low-temperature demineralized water input device to operate accordingly.

[0016] Preferably, the phosphoric acid input device includes a phosphoric acid tank and an inlet pump. The inlet pump is connected to the control unit via a signal connection. The inlet pipe of the inlet pump is connected to the phosphoric acid tank, and the outlet pipe of the inlet pump is connected to the emergency discharge pipe.

[0017] Preferably, the phosphoric acid input device further includes a pH detection component and a phosphoric acid flow control system. The pH detection component is located on the open collection tank and is used to detect the pH value of the oxidized liquid in the open collection tank. The phosphoric acid flow control system is located on the output pipe of the inlet pump and is used to adjust the amount of phosphoric acid input in the emergency discharge pipe. The pH detection component and the phosphoric acid flow control system establish a signal connection so that the pH value of the oxidized liquid in the open collection tank is always less than 7.

[0018] Preferably, the cooling device includes a cooler that establishes a signal connection with the control unit, the cooler is disposed on the emergency discharge pipe, the water inlet of the cooler is connected to the cooling water input pipe, and the water outlet of the cooler is connected to the cooling water output pipe.

[0019] Preferably, the cooling device further includes a cooling water flow control system and a temperature detection component. The temperature detection component is installed on the cooled emergency discharge pipe and is used to monitor the temperature of the oxidant in the cooled emergency discharge pipe. The cooling water flow control system is installed on the cooling water input pipe and is used to adjust the flow rate of cooling water supplied to the cooler. The cooling water flow control system and the temperature detection component establish a signal connection so that the temperature of the oxidant in the cooled emergency discharge pipe is at a first desired value.

[0020] Preferably, the first desired value is 15°C.

[0021] Preferably, the nitrogen input device includes a nitrogen tank, a nitrogen flow control system, and an oxygen detection component. The output pipe of the nitrogen tank is connected to the emergency discharge pipe. The nitrogen flow control system is located on the output pipe of the nitrogen tank to adjust the nitrogen flow rate output to the emergency discharge pipe. The oxygen detection component is located on the open collection tank to detect the oxygen content in the open collection tank. The oxygen detection component establishes a signal connection with the nitrogen flow control system to ensure that the oxygen content in the open collection tank is a second desired value.

[0022] Preferably, the second desired value is in the range of 5-8% by volume.

[0023] Preferably, the low-temperature demineralized water input device includes a low-temperature demineralized water tank and a low-temperature demineralized water pump. The low-temperature demineralized water pump establishes a signal connection with the control unit. The input pipe of the low-temperature demineralized water pump is connected to the low-temperature demineralized water tank. The output pipe of the low-temperature demineralized water pump is connected to the emergency discharge pipe after nitrogen is input. The output pipe of the low-temperature demineralized water pump is equipped with a low-temperature demineralized water flow control system to adjust the flow rate of low-temperature demineralized water output to the emergency discharge pipe.

[0024] Preferably, it also includes a potential grounding device, wherein the oxidation tower, the emergency discharge pipe, the open collection tank, the phosphoric acid input device, the cooling device, the nitrogen input device, and the low-temperature demineralized water input device are all connected to the potential grounding device.

[0025] Compared to the aforementioned background technology, the emergency discharge system for the oxidation tower provided by this invention, when the real-time monitoring value acquired by the temperature monitoring device is transmitted to the control unit, the control unit determines whether the real-time monitoring value has reached a preset value. When the real-time monitoring value reaches the preset value, the control unit correspondingly controls the emergency discharge valve, phosphoric acid input device, cooling device, nitrogen input device, and low-temperature demineralized water input device to operate. The emergency discharge valve is fully opened, and the working liquid in the oxidation tower is discharged into the open collection tank through the emergency discharge pipe. Since phosphoric acid can be input into the emergency discharge pipe when the phosphoric acid input device is working, the phosphoric acid mixes with the oxidation liquid urgently discharged from the emergency discharge pipe. The phosphoric acid neutralizes the alkaline substances in the oxidation liquid, making the oxidation liquid acidic. In this environment, the stability of hydrogen peroxide is improved, and the hydrogen peroxide in the oxidizing liquid does not decompose significantly. The cooling device lowers the temperature of the oxidizing liquid in the emergency discharge pipe, resulting in a significant decrease in the decomposition rate of hydrogen peroxide. The nitrogen input device introduces nitrogen into the emergency discharge pipe, which is then transferred to the open collection tank. This reduces the oxygen content in both the emergency discharge pipe and the open collection tank. The decreased oxygen content raises the flash point of the working fluid from approximately 68°C to over 80°C, preventing flash explosions. The oxygen-deficient environment also makes the normally flammable working fluid difficult to ignite, thus preventing fires. In addition, the addition of nitrogen gas acts as a stirrer, ensuring a more thorough and uniform mixing of phosphoric acid and the oxidizing solution, preventing localized alkalinity in the oxidizing solution. When the low-temperature demineralized water input device is operating, low-temperature demineralized water can be introduced into the emergency discharge pipe, and this water can be transferred to the open collection tank via the emergency discharge pipe. The temperature of the low-temperature demineralized water is approximately 10°C, and it has already had common cations and anions in water, such as iron, calcium, and chloride ions, removed beforehand. This further lowers the temperature of the oxidizing solution to approximately 12°C and prevents the decomposition of hydrogen peroxide in the presence of iron ions. Since the solubility of hydrogen peroxide in the low-temperature demineralized water is much greater than its solubility in the working solution, and the low-temperature demineralized water and the working solution are immiscible, the injection of low-temperature demineralized water can also extract hydrogen peroxide from the working solution, reducing the hydrogen peroxide concentration from over 90% to below 35%. This reduction in concentration significantly lowers the safety risks associated with hydrogen peroxide.

[0026] In summary, the emergency material removal system for an oxidation tower provided in this application avoids or reduces the decomposition of hydrogen peroxide during emergency material removal, increases the flash point of the working liquid, prevents flash explosion and combustion of the working liquid, and achieves automatic control operation. Personnel do not need to operate on-site at the hydrogen peroxide production unit, eliminating the possibility of slow or erroneous manual operation, reducing the time personnel are exposed to the hydrogen peroxide production unit, and improving personnel safety. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of an emergency material withdrawal system for an oxidation tower provided in an embodiment of the present invention.

[0029] in:

[0030] 1-Oxidation tower, 2-Emergency discharge pipe, 3-Open collection tank, 4-Phosphoric acid input device, 5-Cooling device, 6-Nitrogen input device, 7-Low temperature demineralized water input device, 8-Potential grounding device;

[0031] 11-Air inlet pipe, 12-Hydrogenated liquid inlet pipe, 13-Oxygen-deficient air outlet pipe, 14-Oxidation liquid outlet pipe, 15-Temperature monitoring device;

[0032] 21-Emergency discharge valve;

[0033] 41-Phosphoric acid tank, 42-Inlet pump, 43-pH detection component, 44-Phosphoric acid flow control system;

[0034] 51-Cooler, 52-Cooling water inlet pipe, 53-Cooling water outlet pipe, 54-Cooling water flow control system, 55-Temperature detection component;

[0035] 61-Nitrogen tank, 62-Nitrogen flow control system, 63-Oxygen detection component;

[0036] 71-Low-temperature demineralized water tank, 72-Low-temperature demineralized water pump, 73-Low-temperature demineralized water flow control system. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] See Figure 1 This application provides an emergency material withdrawal system for an oxidation tower, comprising:

[0040] Oxidation tower 1 is provided with an air input pipe 11, a hydrogenated liquid input pipe 12, an oxygen-deficient air output pipe 13, and an oxidation liquid output pipe 14 that connect to the cavity of oxidation tower 1. Specifically, the air input pipe 11 and the hydrogenated liquid input pipe 12 are located in the lower middle part of the left side of oxidation tower 1, the oxygen-deficient air output pipe 13 is located at the top of oxidation tower 1, and the oxidation liquid output pipe 14 is located at the upper right side of oxidation tower 1.

[0041] Temperature monitoring device 15 is installed on oxidation tower 1 to monitor the temperature inside the oxidation tower 1 cavity in real time, that is, to monitor the temperature of the oxidizing liquid inside the oxidation tower 1 cavity.

[0042] Emergency discharge pipe 2 and open collection tank 3. One end of emergency discharge pipe 2 is connected to the bottom of oxidation tower 1, and an emergency discharge valve 21 is provided at this end. That is, an emergency discharge valve 21 is provided at the end of emergency discharge pipe 2 near the bottom of oxidation tower 1. The emergency discharge valve 21 is a pneumatic valve to realize the opening or closing of emergency discharge pipe 2. The other end is connected to open collection tank 3, and the top of open collection tank 3 is set as an opening.

[0043] Phosphoric acid input device 4 is connected to emergency discharge pipe 2. When phosphoric acid input device 4 is working, phosphoric acid is input into emergency discharge pipe 2.

[0044] Cooling device 5 is installed on emergency discharge pipe 2 after phosphoric acid is input. When cooling device 5 is working, the temperature of the oxidizing liquid in emergency discharge pipe 2 decreases.

[0045] Nitrogen input device 6 is connected to the cooled emergency discharge pipe 2. When nitrogen input device 6 is working, nitrogen is input into emergency discharge pipe 2.

[0046] The low-temperature demineralized water input device 7 is connected to the emergency discharge pipe 2 after nitrogen is input. When the low-temperature demineralized water input device 7 is working, low-temperature demineralized water is input into the emergency discharge pipe 2.

[0047] The control unit establishes signal connections with the emergency discharge valve 21, temperature monitoring device 15, phosphoric acid input device 4, cooling device 5, nitrogen input device 6, and low-temperature demineralized water input device 7, respectively. The real-time monitoring value obtained by the temperature monitoring device 15 is transmitted to the control unit. The control unit determines whether the real-time monitoring value has reached the preset value. When the real-time monitoring value reaches the preset value, the control unit controls the emergency discharge valve 21, phosphoric acid input device 4, cooling device 5, nitrogen input device 6, and low-temperature demineralized water input device 7 to work.

[0048] By using the emergency discharge system of the oxidation tower of this application, when the real-time monitoring value obtained by the temperature monitoring device 15 is transmitted to the control unit, the control unit determines whether the real-time monitoring value has reached the preset value. When the real-time monitoring value reaches the preset value, the control unit controls the emergency discharge valve 21, the phosphoric acid input device 4, the cooling device 5, the nitrogen input device 6, and the low-temperature demineralized water input device 7 to work. The emergency discharge valve 21 is fully opened, and the working liquid in the oxidation tower 1 is discharged into the open collection tank 3 through the emergency discharge pipe 2. Since the phosphoric acid input device 4 can input phosphoric acid into the emergency discharge pipe 2 when it is working, the phosphoric acid mixes with the oxidation liquid urgently discharged from the emergency discharge pipe 2. The phosphoric acid neutralizes the alkaline substances in the oxidation liquid, making the oxidation liquid acidic. Under these conditions, the stability of hydrogen peroxide is improved, and at this point, the hydrogen peroxide in the oxidizing liquid does not decompose significantly. Because the cooling device 5 lowers the temperature of the oxidizing liquid in the emergency discharge pipe 2, the decomposition rate of hydrogen peroxide decreases dramatically. Because the nitrogen input device 6 inputs nitrogen into the emergency discharge pipe 2, and the nitrogen is transferred to the open collection tank 3 through the emergency discharge pipe 2, the oxygen content in the emergency discharge pipe 2 and the open collection tank 3 decreases. Due to the decrease in oxygen content, the flash point of the working liquid increases from approximately 68°C to over 80°C, preventing flash explosions. The reduced oxygen content creates an oxygen-deficient environment, making the working liquid, which is normally flammable in air, difficult to ignite, thus preventing fires. In addition, the addition of nitrogen gas acts as a stirrer, ensuring a more thorough and uniform mixing of phosphoric acid and the oxidizing solution, preventing localized alkalinity in the oxidizing solution. When the low-temperature demineralized water input device 7 is operating, low-temperature demineralized water can be introduced into the emergency discharge pipe 2, and this water can be transferred to the open collection tank 3 via the emergency discharge pipe 2. The temperature of the low-temperature demineralized water is approximately 10°C, and it has already had common cations and anions in water, such as iron ions, calcium ions, and chloride ions, removed beforehand. This further lowers the temperature of the oxidizing solution to approximately 12°C and prevents the decomposition of hydrogen peroxide in the presence of iron ions. Since the solubility of hydrogen peroxide in the low-temperature demineralized water is much greater than its solubility in the working solution, and the low-temperature demineralized water and the working solution are immiscible, the injection of low-temperature demineralized water can also extract hydrogen peroxide from the working solution, reducing the hydrogen peroxide concentration from over 90% to below 35%. This reduction in concentration significantly lowers the safety risks associated with hydrogen peroxide.

[0049] In summary, the emergency material removal system for an oxidation tower provided in this application avoids or reduces the decomposition of hydrogen peroxide during emergency material removal, increases the flash point of the working liquid, prevents flash explosion and combustion of the working liquid, and achieves automatic control operation. Personnel do not need to operate on-site at the hydrogen peroxide production unit, eliminating the possibility of slow or erroneous manual operation, reducing the time personnel are exposed to the hydrogen peroxide production unit, and improving personnel safety.

[0050] Specifically, under normal operating conditions, the materials in the hydrogenated liquid inlet pipe 12, air inlet pipe 11, oxidized liquid outlet pipe 14, and oxygen-deficient air outlet pipe 13 are all under certain pressure, temperature, and flow conditions, and the reaction proceeds stably. The temperature monitoring device 15 on the wall of the oxidation tower 1 can detect the temperature inside the oxidation tower 1 in real time, and the temperature is stable at 45-55℃.

[0051] Specifically, the control unit is a programmable logic controller.

[0052] Specifically, when the real-time monitoring value obtained by the temperature monitoring device 15 is less than the preset value, the emergency discharge valve 21, the phosphoric acid input device 4, the cooling device 5, the nitrogen input device 6, and the low-temperature demineralized water input device 7 are all in the closed state.

[0053] Specifically, the temperature monitoring device 15 uses existing mature technology, such as an infrared thermometer. The preset value in this application is 58°C. That is, when the real-time monitoring value of the temperature monitoring device 15 reaches 58°C, the control unit automatically controls the emergency material withdrawal system to work. The preset value can also be 57°C or 56°C. Since the flash point of the working liquid is about 68°C, when the temperature of the oxidizing liquid exceeds 58°C, and due to the exothermic decomposition of hydrogen peroxide, the temperature of the oxidizing liquid continues to rise, eventually exceeding the flash point of the working liquid. Even without electrostatic discharge, it is very easy to cause a flash explosion. This application preferably sets the preset value to 58°C.

[0054] Based on the above embodiments, the phosphoric acid input device 4 includes a phosphoric acid tank 41 and an inlet pump 42. The inlet pump 42 establishes a signal connection with the control unit. The input pipe of the inlet pump 42 is connected to the phosphoric acid tank 41, and the output pipe of the inlet pump 42 is connected to the emergency discharge pipe 2. The phosphoric acid input device 4 also includes a pH detection component 43 and a phosphoric acid flow control system 44. The pH detection component 43 is located on the open collection tank 3 and is used to detect the pH value of the oxidized liquid in the open collection tank 3. The phosphoric acid flow control system 44 is located on the output pipe of the inlet pump 42 and is used to adjust the amount of phosphoric acid input in the emergency discharge pipe 2. The pH detection component 43 and the phosphoric acid flow control system 44 establish a signal connection so that the pH value of the oxidized liquid in the open collection tank 3 is always less than 7.

[0055] The purpose of this setup is that when the emergency discharge valve 21 is activated, its operating state changes from closed to fully open. The control unit then activates the inlet pump 42, allowing phosphoric acid from the phosphoric acid tank 41 to be pumped into the emergency discharge pipe 2. The pH detection component 43 is used to detect the pH value of the oxidizing liquid in the open collection tank 3. The pH detection component 43 and the phosphoric acid flow control system 44 establish a signal connection. The phosphoric acid flow control system 44 adjusts the amount of phosphoric acid input into the emergency discharge pipe 2 based on the monitoring value of the pH detection component 43, ensuring that the pH value of the oxidizing liquid in the open collection tank 3 is always less than 7, keeping the oxidizing liquid always acidic. In this acidic environment, the stability of hydrogen peroxide is improved, and the hydrogen peroxide in the oxidizing liquid does not decompose significantly.

[0056] Specifically, the materials of the flow-through components of the inlet pump 42, the phosphoric acid tank 41, and the phosphoric acid flow control system 44 are all 316L stainless steel.

[0057] Specifically, the pH detection component 43 utilizes existing mature technologies, such as an online pH detection electrode component disclosed in Chinese Patent CN207096158U.

[0058] Specifically, the phosphoric acid flow control system 44 utilizes existing mature technologies, such as automatic control valves, shut-off valves, and relays. The relays establish signal connections with the automatic control valves, shut-off valves, and pH detection components 43. When the pH value of the oxidizing liquid in the open collection tank 3 increases, the relays can fully open the automatic control valves, thereby increasing the phosphoric acid input and stabilizing the pH value of the oxidizing liquid in the open collection tank 3 at around 6.

[0059] Based on the above embodiments, the cooling device 5 includes a cooler 51 that establishes a signal connection with the control unit. The cooler 51 is located on the emergency discharge pipe 2 after the phosphoric acid is input. The water inlet of the cooler 51 is connected to the cooling water input pipe 52, and the water outlet of the cooler 51 is connected to the cooling water output pipe 53. The cooling device 5 also includes a cooling water flow control system 54 and a temperature detection component 55. The temperature detection component 55 is located on the cooled emergency discharge pipe 2 and is used to monitor the temperature inside the cooled emergency discharge pipe 2. The cooling water flow control system 54 is located on the cooling water input pipe 52 and is used to adjust the flow rate of cooling water delivered to the cooler 51. The cooling water flow control system 54 and the temperature detection component 55 establish a signal connection so that the temperature inside the cooled emergency discharge pipe 2 is a first desired value.

[0060] The purpose of this setup is that when the emergency discharge valve 21 is activated, its operating state changes from closed to fully open. The control unit controls the cooler 51 to operate, reducing the temperature of the oxidant in the emergency discharge pipe 2. The temperature detection component 55 monitors the temperature of the oxidant in the cooled emergency discharge pipe 2. The cooling water flow control system 54 establishes a signal connection with the temperature detection component 55. The cooling water flow control system 54 adjusts the flow rate of cooling water into the cooler 51 based on the monitoring value of the temperature detection component 55, so that the temperature of the oxidant in the cooled emergency discharge pipe 2 is at the first desired value. Since the cooling device 5 can reduce the temperature of the oxidant in the emergency discharge pipe 2 when it is activated, the decomposition rate of hydrogen peroxide decreases significantly due to the substantial reduction in the oxidant temperature.

[0061] Specifically, the cooler 51 and the temperature detection component 55 are direct uses of existing mature technologies, and the temperature detection component 55 can be an application of an infrared thermometer;

[0062] Specifically, the cooling water is low-temperature water at a temperature of about 7°C, and the first expected value is 15°C. That is, the temperature of the oxidant in the emergency discharge pipe 2 after cooling is 15°C. Due to the significant decrease in the temperature of the oxidant, the decomposition rate of hydrogen peroxide decreases significantly.

[0063] Specifically, the cooling water flow control system 54 uses existing mature technologies, such as automatic control valves, shut-off valves and relays. The relays establish signal connections with the automatic control valves, shut-off valves and temperature detection components 55. When the temperature of the oxidant in the cooled emergency discharge pipe 2 is greater than 15°C, the relays can fully open the automatic control valves, thereby increasing the cooling water input and stabilizing the temperature of the oxidant in the cooled emergency discharge pipe 2 at around 15°C.

[0064] Based on the above embodiments, the nitrogen input device 6 includes a nitrogen tank 61, a nitrogen flow control system 62, and an oxygen detection component 63. The nitrogen flow control system 62 establishes a signal connection with the control unit. The output pipe of the nitrogen tank 61 is connected to the emergency discharge pipe 2. The nitrogen flow control system 62 is located on the output pipe of the nitrogen tank 61 to adjust the amount of nitrogen flow output to the emergency discharge pipe 2. The oxygen detection component 63 is located on the open collection tank 3 to detect the oxygen content in the open collection tank 3. The oxygen detection component 63 establishes a signal connection with the nitrogen flow control system 62 to ensure that the oxygen content in the open collection tank 3 is the second desired value.

[0065] The purpose of this setup is that when the emergency discharge valve 21 is activated, its operating state changes from closed to fully open. The control unit then activates the nitrogen flow control system 62, which inputs nitrogen into the emergency discharge pipe 2. The nitrogen is then transferred through the emergency discharge pipe 2 to the open collection tank 3. As a result, the oxygen content in the environment of the emergency discharge pipe 2 and the open collection tank 3 decreases. The oxygen detection component 63 is used to detect the oxygen content at the top of the open collection tank 3. The oxygen detection component 63 establishes a signal connection with the nitrogen flow control system 62. The nitrogen flow control system 62 adjusts the nitrogen flow rate output to the emergency discharge pipe 2 according to the monitoring value of the oxygen detection component 63, so that the oxygen content in the open collection tank 3 is 5-8% (v / v). Due to the decrease in oxygen content, the flash point of the working fluid increases from about 68°C to over 80°C, preventing the working fluid from flashing and exploding. The decrease in oxygen content creates an oxygen-deficient environment, making the working fluid, which is originally flammable in air, difficult to ignite, thus preventing a fire. In addition, adding nitrogen gas acts as a stirrer, ensuring that the phosphoric acid and the oxidizing solution are mixed more thoroughly and evenly, thus preventing the oxidizing solution from becoming alkaline in some areas.

[0066] Specifically, the oxygen detection component 63 is a direct use of existing technology, such as a direct use of an oxygen detector.

[0067] Specifically, the nitrogen flow control system 62 uses existing mature technologies, such as automatic control valves, shut-off valves and relays. The relays establish signal connections with the automatic control valves, shut-off valves and oxygen detection components 63. When the oxygen content in the open collection tank 3 is much greater than the second expected value, the relays can fully open the automatic control valves, thereby increasing the nitrogen input and stabilizing the oxygen content in the open collection tank 3 at about 5-8% (v / v).

[0068] Based on the above embodiments, the low-temperature demineralized water input device 7 includes a low-temperature demineralized water tank 71 and a low-temperature demineralized water pump 72. The low-temperature demineralized water pump 72 establishes a signal connection with the control unit. The input pipe of the low-temperature demineralized water pump 72 is connected to the low-temperature demineralized water tank 71. The output pipe of the low-temperature demineralized water pump 72 is connected to the emergency discharge pipe 2 after nitrogen is input. The output pipe of the low-temperature demineralized water pump 72 is equipped with a low-temperature demineralized water flow control system 73 to adjust the flow rate of the output low-temperature demineralized water.

[0069] The purpose of this design is that when the emergency discharge valve 21 is activated, its operating state changes from closed to fully open. The control unit then activates the cryogenic demineralized water pump 72, injecting cryogenic demineralized water into the emergency discharge pipe 2. This demineralized water can then be transferred to the open collection tank 3. The temperature of the demineralized water is approximately 10°C, and it has already had common cations and anions in water, such as iron ions, calcium ions, and chloride ions, removed beforehand. This further reduces the temperature of the oxidizing solution to approximately 12°C and prevents the decomposition of hydrogen peroxide in the presence of iron ions. Since the solubility of hydrogen peroxide in the cryogenic demineralized water is much greater than its solubility in the working solution, and the cryogenic demineralized water and the working solution are immiscible, injecting the cryogenic demineralized water can also extract hydrogen peroxide from the working solution, reducing the hydrogen peroxide concentration from over 90% to below 35%. This reduction in concentration significantly lowers the safety risks associated with hydrogen peroxide.

[0070] Specifically, the low-temperature demineralized water flow control system 73 utilizes existing mature technologies, and may include, for example, automatic control valves and shut-off valves.

[0071] Based on the above embodiments, the emergency material discharge system of the oxidation tower also includes a potential grounding device 8. The oxidation tower 1, the emergency material discharge pipe 2, the open collection tank 3, the phosphoric acid input device 4, the cooling device 5, the nitrogen input device 6, and the low-temperature demineralized water input device 7 are all connected to the potential grounding device 8.

[0072] Specifically, oxidation tower 1, emergency discharge pipe 2, inlet pump 42, phosphoric acid tank 41, cooler 51, nitrogen tank 61, low-temperature demineralized water pump 72, low-temperature demineralized water tank 71, and open collection tank 3 are all connected to potential grounding device 8. Specifically, potential grounding device 8 is a direct use of existing mature technology. The purpose of this setting is to prevent potential differences from forming between these facilities, and to promptly conduct away the static electricity generated by the friction between the oxidizing liquid and the inner wall of the pipe during emergency discharge, so as to avoid flash explosions and fires caused by electrostatic discharge.

[0073] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0074] This article uses specific examples to illustrate the principle and implementation of an emergency material withdrawal system for an oxidation tower provided by the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An emergency material withdrawal system for an oxidation tower, characterized in that, include: The oxidation tower (1) is equipped with an air inlet pipe (11), a hydrogenated liquid inlet pipe (12), an oxygen-deficient air outlet pipe (13), and an oxidation liquid outlet pipe (14) that connect to the cavity. A temperature monitoring device (15) is installed on the oxidation tower (1) to monitor the temperature inside the oxidation tower (1) in real time; Emergency discharge pipe (2) and open collection tank (3). One end of the emergency discharge pipe (2) is connected to the bottom of the oxidation tower (1) and an emergency discharge valve (21) is provided at this end. The other end is connected to the open collection tank (3). Phosphoric acid input device (4) is connected to the emergency discharge pipe (2) and inputs phosphoric acid into the emergency discharge pipe (2) when the phosphoric acid input device (4) is working; A cooling device (5) is installed on the emergency discharge pipe (2). When the cooling device (5) is working, the temperature of the oxidizing liquid in the emergency discharge pipe (2) decreases. A nitrogen input device (6) is connected to the emergency discharge pipe (2) and inputs nitrogen into the emergency discharge pipe (2) when the nitrogen input device (6) is working. The low-temperature demineralized water input device (7) is connected to the emergency discharge pipe (2). When the low-temperature demineralized water input device (7) is working, it inputs low-temperature demineralized water into the emergency discharge pipe (2). The control unit establishes signal connections with the emergency discharge valve (21), the temperature monitoring device (15), the phosphoric acid input device (4), the cooling device (5), the nitrogen input device (6), and the low-temperature demineralized water input device (7), respectively. The real-time monitoring value obtained by the temperature monitoring device (15) is transmitted to the control unit. The control unit determines whether the real-time monitoring value has reached a preset value. When the real-time monitoring value reaches the preset value, the control unit controls the emergency discharge valve (21), the phosphoric acid input device (4), the cooling device (5), the nitrogen input device (6), and the low-temperature demineralized water input device (7) to work accordingly. The cooling device (5) includes a cooler (51) that establishes a signal connection with the control unit. The cooler (51) is located on the emergency discharge pipe (2). The water inlet of the cooler (51) is connected to the cooling water input pipe (52), and the water outlet of the cooler (51) is connected to the cooling water output pipe (53). The cooling device (5) further includes a cooling water flow control system (54) and a temperature detection component (55). The temperature detection component (55) is installed on the cooled emergency discharge pipe (2) and is used to monitor the temperature of the oxidant in the cooled emergency discharge pipe (2). The cooling water flow control system (54) is installed on the cooling water input pipe (52) and is used to adjust the flow rate of cooling water delivered to the cooler (51). The cooling water flow control system (54) and the temperature detection component (55) establish a signal connection so that the temperature of the oxidant in the cooled emergency discharge pipe (2) is the first desired value. The nitrogen input device (6) includes a nitrogen tank (61), a nitrogen flow control system (62), and an oxygen detection component (63). The output pipe of the nitrogen tank (61) is connected to the emergency discharge pipe (2). The nitrogen flow control system (62) is located on the output pipe of the nitrogen tank (61) to adjust the nitrogen flow rate output to the emergency discharge pipe (2). The oxygen detection component (63) is located on the open collection tank (3) to detect the oxygen content in the open collection tank (3). The oxygen detection component (63) establishes a signal connection with the nitrogen flow control system (62) to make the oxygen content in the open collection tank (3) a second desired value. The low-temperature demineralized water input device (7) includes a low-temperature demineralized water tank (71) and a low-temperature demineralized water pump (72). The low-temperature demineralized water pump (72) establishes a signal connection with the control unit. The input pipe of the low-temperature demineralized water pump (72) is connected to the low-temperature demineralized water tank (71). The output pipe of the low-temperature demineralized water pump (72) is connected to the emergency discharge pipe (2) after nitrogen is input. The output pipe of the low-temperature demineralized water pump (72) is equipped with a low-temperature demineralized water flow control system (73) to adjust the flow rate of low-temperature demineralized water output to the emergency discharge pipe (2).

2. The emergency material withdrawal system for the oxidation tower according to claim 1, characterized in that, The phosphoric acid input device (4) includes a phosphoric acid tank (41) and an inlet pump (42). The inlet pump (42) establishes a signal connection with the control unit. The input pipe of the inlet pump (42) is connected to the phosphoric acid tank (41), and the output pipe of the inlet pump (42) is connected to the emergency discharge pipe (2).

3. The emergency material withdrawal system for the oxidation tower according to claim 2, characterized in that, The phosphoric acid input device (4) further includes a pH detection component (43) and a phosphoric acid flow control system (44). The pH detection component (43) is located on the open collection tank (3) and is used to detect the pH value of the oxidized liquid in the open collection tank (3). The phosphoric acid flow control system (44) is located on the output pipe of the inlet pump (42) and is used to adjust the amount of phosphoric acid input in the emergency discharge pipe (2). The pH detection component (43) and the phosphoric acid flow control system (44) establish a signal connection so that the pH value of the oxidized liquid in the open collection tank (3) is always less than 7.

4. The emergency material withdrawal system for the oxidation tower according to claim 1, characterized in that, The first expected value is 15℃.

5. The emergency material withdrawal system for the oxidation tower according to claim 1, characterized in that, The second expected value is in the range of 5-8% by volume.

6. The emergency material withdrawal system for the oxidation tower according to any one of claims 1-5, characterized in that, It also includes a potential grounding device (8), and the oxidation tower (1), the emergency discharge pipe (2), the open collection tank (3), the phosphoric acid input device (4), the cooling device (5), the nitrogen input device (6) and the low temperature demineralized water input device (7) are all connected to the potential grounding device (8).

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