Hydrogenating liquid cooler for hydrogen peroxide production

Abstract

The utility model provides a hydrogenated liquid cooler for hydrogen peroxide production, including the cooling cylinder who links with the discharge port of hydrogen peroxide production equipment, the inside of cooling cylinder is provided with cooling pipe group, the inside of cooling cylinder is filled with heat conducting medium, and the import of cooling pipe group and discharge port are linked through heat -resisting circulating pump and heat -resisting pipeline, the utility model discloses can through heat -resisting circulating pump and take in the liquid of cooling in cooling pipe group, realize the path of increasing the circulating flow of the liquid of cooling, has improved cooling effect and cooling efficiency greatly.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrogenated liquid cooling equipment, specifically to a hydrogenated liquid cooler for hydrogen peroxide production. Background Technology

[0002] In the process of producing hydrogen peroxide using the anthraquinone method, the temperature of the hydrogenated liquid needs to be reduced from 70°C to about 40°C before entering the oxidation tower. This process is usually completed by a traditional shell-and-tube heat exchanger.

[0003] Hydrogen peroxide, an important chemical raw material, is widely used in bleaching, disinfection, and environmental protection. Its production process primarily employs the anthraquinone method, with core steps including hydrogenation, oxidation, extraction, and purification. In the hydrogenation stage, the working fluid reacts with hydrogen gas under the action of a catalyst to generate a hydrogenated liquid. The temperature of this liquid after the reaction is typically as high as 120-150℃, requiring cooling to 40-60℃ before proceeding to the subsequent oxidation process. Insufficient or untimely cooling can lead to decreased oxidation efficiency, accelerated catalyst deactivation, and even affect the purity and yield of the hydrogen peroxide product.

[0004] The main problem with existing hydrogen peroxide production hydrogenated liquid coolers is that they mostly use a single spiral tube or tubular structure, which limits the heat exchange area. In addition, the hydrogenated liquid has a single flow path in the pipe, resulting in insufficient heat exchange with the cooling medium. This leads to long cooling times, which cannot meet the high-efficiency requirements of large-scale production and restricts the overall production efficiency. Utility Model Content

[0005] In view of this, the present invention provides a hydrogenated liquid cooler for hydrogen peroxide production, which can greatly improve the circulation path and cooling efficiency of the liquid to be cooled through at least two spiral heat dissipation pipes, and achieve efficient heat dissipation of the liquid to be cooled. This solves the problem that traditional coolers mostly use a single spiral tube or tube-type structure, which has a limited heat exchange area and a single flow path of hydrogenated liquid in the pipe, resulting in insufficient heat exchange with the cooling medium, leading to long cooling time and failing to meet the high-efficiency requirements of large-scale production, thus restricting the overall production efficiency.

[0006] To solve the above-mentioned technical problems, this utility model provides a hydrogen peroxide production hydrogenated liquid cooler, including a cooling cylinder connected to the discharge port of the hydrogen peroxide production equipment. The cooling cylinder is equipped with a cooling tube assembly and is filled with a heat-conducting medium. The inlet of the cooling tube assembly is connected to the discharge port through a heat-resistant circulating pump and a heat-resistant pipe. This utility model can use the heat-resistant circulating pump to draw the liquid to be cooled into the cooling tube assembly, thereby increasing the circulation path of the liquid to be cooled and greatly improving the cooling effect and cooling efficiency.

[0007] The cooling pipe assembly consists of two sets of interlocking spiral circulation pipes. Two inlets are opened on the side wall of the cooling cylinder, and each inlet contains a spiral circulation pipe.

[0008] The inlet and outlet of the heat-resistant circulating pump are connected by a discharge pipe. The outlet of the heat-resistant circulating pump is equipped with a heat-resistant pipe, and the other end of the heat-resistant pipe is equipped with a diversion valve. The two outlets of the diversion valve are respectively connected to the inlet of a spiral circulating pipe.

[0009] Cooling pipes are installed on the outer wall of the cooling cylinder, and the cooling pipes are connected to the coolant storage tank.

[0010] The inlet of the cooling pipe is connected to the outlet of the vane pump, and the inlet of the vane pump is connected to the coolant storage tank.

[0011] The flow divider valve is a three-way valve.

[0012] The spiral circulation pipe is made of copper.

[0013] The cooling cylinder is equipped with sealing flanges at both ends, and high-temperature resistant rubber gaskets are installed on the mating surfaces of the sealing flanges and the cooling cylinder.

[0014] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. Significantly improved cooling efficiency, solving the problem of low efficiency in existing equipment: This utility model greatly increases the heat exchange area through two sets of interlocking spiral cooling tubes. The high specific heat capacity of the heat transfer oil enhances heat transfer. Combined with the excellent thermal conductivity of copper pipes, the cooling time of the hydrogenated liquid is greatly shortened, and the cooling efficiency is greatly improved, meeting the high-efficiency requirements of large-scale production.

[0015] 2. Significantly optimized cooling uniformity, solving the problem of local overheating: This utility model uses a diversion valve to evenly distribute the hydrogenated liquid to two sets of spiral pipes. The interlocking spiral structure ensures that the hydrogenated liquid flows along a consistent path and at a uniform speed, without any stagnation or uneven flow rate. After cooling, the temperature fluctuation range of the hydrogenated liquid is greatly reduced, effectively avoiding catalyst deactivation and product quality fluctuations caused by local high temperatures.

[0016] 3. Reliable sealing, eliminating safety hazards: This utility model uses a sealing flange and a sealing gasket to achieve stable sealing performance under high temperature and high pressure conditions, greatly reducing the leakage rate and completely solving the leakage problem caused by the failure of existing equipment seals, thereby reducing safety risks and maintenance costs.

[0017] 4. Stable operation and precise temperature control: This invention can ensure stable coolant circulation flow through a vane pump, and the heat transfer medium has good thermal stability. With the real-time monitoring of dual temperature sensors, the cooling temperature of the hydrogenated liquid can be precisely controlled within the set range of 40-60℃, ensuring production continuity and product quality stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the hydrogen peroxide production hydrogenated liquid cooler of this utility model; Figure 2 This is an isometric view of the hydrogen peroxide production hydrogenated liquid cooler of this utility model; Figure 3 This is a front view of the hydrogen peroxide production hydrogenated liquid cooler of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 100, cooling cylinder; 200, cooling pipe assembly; 210, spiral circulation pipe; 300, feed inlet; 400, cooling pipe; 500, sealing flange. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-3 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0021] like Figure 1-3As shown: This embodiment provides a hydrogen peroxide production hydrogenated liquid cooler, including a cooling cylinder 100 connected to the discharge port of the hydrogen peroxide production equipment. The cooling cylinder 100, as the core load-bearing component, is made of 304 stainless steel through a process of CNC cutting, rolling, argon arc welding, inner and outer wall polishing, and anti-corrosion treatment. It possesses excellent high-temperature resistance and structural strength, capable of withstanding temperatures up to 160℃ and pressures up to 0.6MPa. The inner wall of the cooling cylinder 100 is coated with a polytetrafluoroethylene (PTFE) anti-corrosion coating. This coating is prepared through a process of sandblasting, rust removal, primer application, high-temperature curing, and topcoat forming, effectively resisting the erosion of corrosive components in the hydrogenated liquid while reducing the risk of scaling on the inner wall. Flange connection surfaces are provided at both ends of the cooling cylinder 100 for assembling sealing flanges 500. The cooling cylinder 100 contains 400 sets of cooling pipes 200, which serve as the core components for the flow and heat exchange of the hydrogenated liquid. These sets utilize two interlocking spiral circulation pipes 210, each made of T2 copper (copper has excellent thermal conductivity). The pipes are manufactured through a process of spiral forming (spiral angle 15-20°), argon arc welding, and hydrostatic testing (1.0 MPa). The interlocking of the two sets of pipes forms a double-layer spiral structure, increasing the heat exchange area by more than 60% compared to traditional single-spiral pipes. The inlet of each cooling pipe set 200 is connected to a heat-resistant pipe via a flange, and the outlet is connected to a discharge pipe. The entire assembly is fixed inside the cooling cylinder 100, completely immersed in the heat-conducting medium to ensure sufficient heat transfer. The interior of the cooling cylinder 100 is filled with a heat-conducting medium, specifically L-QD320 high-temperature heat-conducting oil. This oil features a wide applicable temperature range (-20℃ to 320℃), good thermal stability, and a large specific heat capacity. The filling volume is 80%-90% of the internal volume of the cooling cylinder 100, ensuring sufficient coverage of the cooling pipes 400 and allowing space for thermal expansion. The heat-conducting medium acts as a heat transfer medium, rapidly absorbing the heat released by the hydrogenated liquid within the pipes and then transferring it to the cooling pipes 400. The inlet and outlet of the 400 sets of 200 cooling pipes are connected via a heat-resistant circulating pump and heat-resistant pipes. The heat-resistant circulating pump is a Grundfos TPG32-160 high-temperature circulating pump, which allows a medium temperature of ≤180℃. It adopts a mechanical seal structure, is wear-resistant and high-temperature resistant, and can stably transport high-temperature hydrogenated liquid to avoid leakage. The heat-resistant pipes are made of 316L stainless steel, and the inner wall is polished to reduce the flow resistance and scaling of the hydrogenated liquid. The pipes are connected by flanges, and the joints are sealed with graphite gaskets. This invention can use the heat-resistant circulating pump to draw the liquid to be cooled into the 400 sets of 200 cooling pipes, thereby increasing the circulation path of the liquid to be cooled and greatly improving the cooling effect and cooling efficiency.

[0022] According to one embodiment of the present invention, such as Figure 1-3As shown, the cooling pipe group 400 200 consists of two sets of spiral circulation pipes 210 that are interlocked together. The cooling cylinder 100 has two feed ports 300 on its side wall, and each feed port 300 contains a spiral circulation pipe.

[0023] According to another embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the inlet and outlet of the heat-resistant circulating pump are connected by a discharge pipe. The outlet of the heat-resistant circulating pump is equipped with a heat-resistant pipe, and the other end of the heat-resistant pipe is equipped with a flow divider valve. The two outlets of the flow divider valve are respectively connected to the inlet of a spiral circulating pipe. The flow divider valve is a Beijing Huade Hydraulic FHS10-20B three-way flow divider and combiner valve, which can evenly distribute the hydrogenated liquid delivered by the heat-resistant circulating pump to the two sets of spiral circulating pipes, ensuring that the flow rate of hydrogenated liquid in each set of pipes is consistent and achieving uniform cooling.

[0024] Cooling pipes 400 are installed on the outer wall of the cooling cylinder 100. The cooling pipes 400 are connected to the coolant storage tank. The cooling pipes 400 are made of T2 copper and are spirally wound on the outer wall of the cooling cylinder 100 at a density of 8-10 turns per meter of cooling cylinder 100. The cooling pipes 400 are bonded to the outer wall of the cooling cylinder 100 with thermally conductive silicone to ensure efficient heat transfer. The coolant storage tank is injection molded from PE material and is used to store coolant (cooling water or L-QC300 type cooling oil can be selected). The tank is equipped with a level gauge and a temperature sensor to monitor the coolant status in real time. The vane pump is a Wilo IL50 / 125-2.2 / 4 type centrifugal vane pump, which operates stably and can provide continuous power to the coolant, ensuring that the coolant circulates between the cooling pipes 400 and the storage tank, quickly removing the heat of the heat transfer medium.

[0025] According to another embodiment of the present invention, such as Figure 1 and Figure 3 As shown, the inlet of cooling pipe 400 is connected to the outlet of vane pump, and the inlet of vane pump is connected to coolant storage tank.

[0026] The flow divider valve is a three-way valve.

[0027] The spiral circulation pipe is made of copper.

[0028] The cooling cylinder 100 is equipped with sealing flanges 500 at both ends. High-temperature resistant rubber gaskets are installed on the mating surfaces of the sealing flanges 500 and the cooling cylinder 100. The sealing flanges 500 at both ends of the cooling cylinder 100 are manufactured using a process of forging, machining, and grinding the sealing surfaces of 304 stainless steel. PTFE (polytetrafluoroethylene) gaskets (temperature resistance ≤260℃, excellent corrosion resistance) are fitted to the sealing surfaces. The sealing flanges 500 are fixedly connected to the ends of the cooling cylinder 100 using high-strength bolts to ensure uniform pressure on the sealing surfaces, achieving reliable sealing under high-temperature and high-pressure conditions and preventing leakage of hydrogenated liquids or heat transfer media.

[0029] A temperature sensor is installed on the cooling cylinder 100 to monitor the temperature of the heat transfer medium in real time; a temperature sensor is installed on the discharge pipe to monitor the temperature of the hydrogenated liquid after cooling; a cooler is installed on the coolant storage tank to replenish the coolant for cooling; valves are installed on each pipeline to regulate the flow rate and cut off the medium during maintenance.

[0030] Working principle and usage of this utility model: First, it should be clarified that the cooler involved in this utility model is mainly used for efficient cooling of various liquids. This utility model takes the cooling of hydrogenated liquid in the hydrogen peroxide production process as an example to explain its working principle and usage method in detail. The installation process is as follows: Cooling cylinder 100 assembly: 304 stainless steel plate is CNC cut to size and rolled, then welded into shape by argon arc welding. The weld is subjected to non-destructive testing (ultrasonic testing). After passing the test, the inner and outer walls of the cylinder are polished, and the inner wall is coated with polytetrafluoroethylene and cured at high temperature.

[0031] Installation of 400 sets of 200 cooling pipes: The copper T2 pipes are processed into two sets of spiral pipes using a pipe bending machine. After welding the joints, a 1.0MPa water pressure test is performed. After passing the test, the two sets of pipes are fitted and fixed together and installed inside the cooling cylinder 100 using a bracket, ensuring that the pipes are completely within the heat-conducting medium filling area of ​​the cooling cylinder 100.

[0032] Filling of heat transfer medium: Inject L-QD320 high-temperature heat transfer oil through the filling port at the top of the cooling cylinder 100, filling it to 85% of the volume of the cooling cylinder 100, and install a level gauge and a temperature sensor.

[0033] Hydrogenated liquid delivery system connection: The heat-resistant circulating pump is fixed on the equipment frame by the base. The inlet is connected to the discharge port flange of the hydrogen peroxide production equipment through the discharge pipe. The outlet is connected to the inlet of the diversion valve through the heat-resistant pipe. The two outlets of the diversion valve are respectively connected to the two inlet flanges of the 400 group 200 cooling pipe. The outlet of the 400 group 200 cooling pipe is connected to the discharge pipe. All flange interfaces are equipped with graphite gaskets for sealing.

[0034] Cooling system installation: The cooling pipe 400 is spirally wound around the outer wall of the cooling cylinder 100 and fixed with thermally conductive silicone. The inlet of the cooling pipe 400 is connected to the outlet flange of the vane pump, the inlet of the vane pump is connected to the outlet of the coolant storage tank, and the outlet of the cooling pipe 400 is connected to the inlet of the coolant storage tank, forming a circulation loop.

[0035] Installation of sealing and auxiliary components: After assembling the PTFE sealing gasket on the sealing flange 500, fix it to both ends of the cooling cylinder 100 with bolts, and tighten the bolts symmetrically and evenly; install the valves and temperature sensors on each pipeline, and connect the electrical control system (select a Siemens S7-200 SMART PLC controller to realize temperature monitoring and pump valve linkage control).

[0036] Commissioning and operation: Check the sealing of all connection parts, start the vane pump to circulate the coolant, and after the coolant temperature stabilizes, start the heat-resistant circulation pump and introduce simulated hydrogenated liquid (using 150℃ hot water as a substitute). Monitor the temperature after cooling, and adjust the flow rate of the diverter valve and vane pump to ensure that the cooling temperature reaches the set range (40-60℃).

[0037] The working principle is as follows: This cooler uses an "indirect heat exchange + dual circulation" mode to cool the hydrogenated liquid. The core principle is as follows: Hydrogenated liquid circulation heat exchange: The high-temperature hydrogenated liquid (120-150℃) discharged from the hydrogen peroxide production equipment enters the heat-resistant circulation pump through the discharge pipe. Under the power of the pump, it is transported to the diversion valve through the heat-resistant pipeline. The diversion valve evenly distributes the hydrogenated liquid into two sets of interlocking spiral circulation pipelines. When the hydrogenated liquid flows in the spiral pipelines, heat is transferred through the pipeline wall to the heat transfer medium (L-QD320 type heat transfer oil) in the cooling cylinder 100, and the temperature of the hydrogenated liquid gradually decreases.

[0038] Coolant circulation and heat dissipation: The vane pump provides circulation power for the coolant (cooling water). The coolant flows within the cooling pipe 400, which is tightly bonded to the outer wall of the cooling cylinder 100 using thermally conductive silicone. This allows for rapid absorption of heat from the heat transfer medium, maintaining its temperature at a low level (45-55℃). After absorbing heat, the coolant flows back to the coolant storage tank, where it cools naturally or is cooled by an auxiliary cooler before re-entering the circulation loop, forming a continuous heat dissipation circuit.

[0039] Precise temperature control: A temperature sensor inside the cooling cylinder 100 monitors the temperature of the heat transfer medium in real time, while a temperature sensor on the discharge pipe monitors the temperature of the cooled hydrogenated liquid. Data from both sensors is fed back to the PLC controller. When the temperature of the heat transfer medium exceeds the set value, the controller automatically adjusts the speed of the vane pump to increase the coolant flow rate; when the cooling temperature of the hydrogenated liquid is lower than the set value, it adjusts the flow rate of the diversion valve or reduces the speed of the heat-resistant circulating pump to ensure that the cooling temperature remains stable within the set range.

[0040] The usage method is as follows: Equipment initialization: Start the electrical control system, set the target cooling temperature (e.g., 50℃) and the upper limit of the heat transfer medium temperature (e.g., 60℃) via the touch screen (Kunlun Tongtai TPC7062Ti), check the status of each valve (ensure that the valves on the discharge pipe, outlet pipe, and coolant circulation pipe are in the open position), check the coolant storage tank level (must be higher than the minimum level line) and the heat transfer medium level to ensure that they meet the requirements.

[0041] Coolant circulation start-up: Start the vane pump to circulate the coolant between the cooling pipe 400 and the coolant storage tank. Run for 5-10 minutes until the coolant temperature stabilizes at 30-35℃, then proceed to the next step.

[0042] Hydrogenated liquid cooling operation: Start the heat-resistant circulating pump and slowly open the valve at the discharge port of the hydrogen peroxide production equipment to allow the high-temperature hydrogenated liquid to smoothly enter the cooler. Adjust the flow distribution of the two sets of spiral pipes through the diversion valve to ensure uniform flow. Monitor the temperature data on the touch screen in real time. If the temperature of the hydrogenated liquid after cooling is higher than the set value, increase the flow rate of the vane pump or decrease the hydrogenated liquid delivery speed; if the temperature is lower than the set value, decrease the flow rate of the vane pump or increase the hydrogenated liquid delivery speed.

[0043] Continuous operation monitoring: During operation, regularly check for leaks at all connection points, monitor the levels of coolant and heat transfer medium, and replenish them promptly if the levels drop; check the operating status of pumps and valves, and immediately stop the machine for repair if any abnormalities occur (such as excessive pump vibration or valve jamming).

[0044] Shutdown and Cleaning: After the hydrogen peroxide production equipment stops discharging, continue running the heat-resistant circulating pump and vane pump for 5-10 minutes to drain and cool the residual hydrogenated liquid in cooling pipe group 200 of group 400. Turn off both pumps and close all valves. Discharge the heat transfer medium (replace regularly, recommended every 6 months) through the drain port at the bottom of cooling cylinder 100. Disassemble cooling pipe group 200 and the pipes, and clean the inner wall (using a 5% citric acid solution for circulating cleaning to remove scale). After cleaning, reassemble and refill with heat transfer medium, ready for the next use.

[0045] This invention significantly improves the circulation path and cooling efficiency of the liquid to be cooled by using at least two spiral heat dissipation pipes, achieving efficient heat dissipation of the liquid to be cooled. It solves the problem that traditional coolers mostly use a single spiral tube or tubular structure, which has a limited heat exchange area and a single flow path of hydrogenated liquid in the pipe, resulting in insufficient heat exchange with the cooling medium, leading to long cooling time and failing to meet the high-efficiency requirements of large-scale production, thus restricting the overall production efficiency.

[0046] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A hydrogen peroxide production hydrogenated liquid cooler, comprising a cooling cylinder (100) connected to the discharge port of a hydrogen peroxide production equipment, characterized in that: The cooling cylinder (100) is provided with a cooling pipe (400) group (200) inside. The cooling cylinder (100) is filled with a heat-conducting medium. The inlet and outlet of the cooling pipe (400) group (200) are connected by a heat-resistant circulating pump and a heat-resistant pipe.

2. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 1, characterized in that: The cooling pipe (400) group (200) consists of two sets of spiral circulation pipes (210) that are interlocked together. The cooling cylinder (100) has two feed ports (300) on its side wall, and each feed port (300) is provided with a spiral circulation pipe.

3. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 2, characterized in that: The inlet and outlet of the heat-resistant circulating pump are connected by a discharge pipe. The outlet of the heat-resistant circulating pump is provided with a heat-resistant pipe. The other end of the heat-resistant pipe is provided with a diversion valve. The two outlets of the diversion valve are respectively connected to the inlet of a spiral circulating pipe.

4. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 1, characterized in that: A cooling pipe (400) is provided on the outer wall of the cooling cylinder (100), and the cooling pipe (400) is connected to the coolant storage tank.

5. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 4, characterized in that: The inlet of the cooling pipe (400) is connected to the outlet of the vane pump, and the inlet of the vane pump is connected to the coolant storage tank.

6. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 3, characterized in that: The diverter valve is a three-way valve.

7. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 2, characterized in that: The spiral circulation pipe is made of copper.

8. The hydrogen peroxide production hydrogenated liquid cooler as described in claim 1, characterized in that: The cooling cylinder (100) is provided with sealing flanges (500) at both ends.

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