A heat conducting oil regenerating device
By designing a heat transfer oil regeneration device, and using sulfuric acid, alkali solution, and clay treatment, rapid regeneration and solid-liquid separation of heat transfer oil are achieved. This solves the problem of performance degradation caused by uneven heating during the phthalic anhydride refining process, and improves production continuity and resource utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KAIFENG JIUHONG CHEM CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-14
AI Technical Summary
In the existing technology, the heat transfer oil undergoes cracking and condensation reactions due to uneven heating during the phthalic anhydride refining process, resulting in a decline in performance. Furthermore, the heat transfer oil needs to be replaced for maintenance, which affects the continuity of production, and the waste heat transfer oil resources are seriously wasted.
Design a heat transfer oil regeneration device, including a heat transfer oil storage tank, a reaction vessel, a booster pump, a filter press, and an online chromatograph, etc., to regenerate the heat transfer oil and perform solid-liquid separation through treatment with sulfuric acid, alkali solution, and clay, so as to achieve rapid replacement and regeneration.
It shortens the time required to replace the regenerated heat transfer oil in the heat transfer oil supply system, reduces production costs, minimizes resource waste, and improves work efficiency.
Smart Images
Figure CN224485964U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat transfer oil regeneration equipment, specifically to a heat transfer oil regeneration device. Background Technology
[0002] Heat transfer oil is a medium for transferring heat. In recent years, it has been widely used in various fields such as chemical engineering, printing and dyeing, rubber, resin, coatings, road construction, papermaking, and grain and oil processing, and its applications and usage are increasing. Most heat transfer oils are composed of hydrocarbons. Due to continuous operation at high temperatures, they are prone to chemical changes such as thermal cracking, oxidative condensation, and coking, leading to a decline in performance and eventually rendering them unusable. Only a small portion of waste heat transfer oil is discarded; the majority has recycling value. Although it can be supplied as fuel oil to refineries, this results in significant environmental pollution and resource waste.
[0003] Phthalic anhydride refining involves continuous distillation processes including pretreatment, light component separation, pure phthalic anhydride distillation, and residue concentration. The pretreatment involves crude phthalic anhydride from the precooler being pumped through a crude phthalic anhydride heater to a first phthalic anhydride treatment tank, from which it overflows sequentially into a second and third phthalic anhydride treatment tank. At the crude phthalic anhydride heater, the crude phthalic anhydride is heated to approximately 260°C. The liquid from the bottom of the third phthalic anhydride treatment tank during light component separation enters a light component column. The overhead gas is condensed by the light component column condenser, and the liquid flows into the light component column. The bottom liquid enters a pure phthalic anhydride column. In pure phthalic anhydride distillation, the overhead gas from the pure phthalic anhydride column is condensed by the pure phthalic anhydride column condenser, and the pure phthalic anhydride is collected in a pure phthalic anhydride intermediate tank, from which it is pumped to the slaking unit. The high-boiling-point concentrate at the bottom of the column flows by gravity into the evaporator under level control. The residue is concentrated in an evaporator, with the lighter components evaporated into a residual liquid washing tower. Most of the condensate returns to the evaporator via the residual liquid washing tower, while a small portion of the distillate returns to the crude phthalic anhydride intermediate tank for re-pretreatment. The concentrated residue is discharged into a waste collection tank before the new treatment cycle begins.
[0004] In the pre-treatment of phthalic anhydride refining, in the process of heating crude phthalic anhydride in the heating link, heating the residue in the residue concentration, and further heating the residue periodically discharged into the waste collection tank, relatively high temperatures are required to achieve this. Here, the relatively high temperature refers to a heating temperature exceeding 200°C. Generally, the heat source used in industrial processing for heating above 200°C is usually heat-conducting oil, considering the continuous demand for the heat source in phthalic anhydride refining. The supply of heat-conducting oil is required to be continuous. However, during the use of heat-conducting oil, cracking and condensation reactions occur due to uneven heating, resulting in the generation of low-boiling substances and high-boiling substances, a decrease in the flash point of the oil product, and an increase in the carbon residue; at the same time, when high-temperature heat-conducting oil contacts air, oxidation reactions occur, increasing the acid value of the oil product and promoting cracking and condensation reactions, generating sludge and sediment, and increasing the viscosity of the oil product. Once the indicators of the heat-conducting oil shown by the heat-conducting oil supply system are abnormal, it is necessary to replace the heat-conducting oil in a timely manner. The replacement of the heat-conducting oil in the heat-conducting oil supply system supporting the phthalic anhydride refining system is carried out during the shutdown maintenance period of the phthalic anhydride refining system. Therefore, there is a requirement for timeliness in replacing the heat-conducting oil in the heat-conducting oil supply system supporting the phthalic anhydride refining system. It aims to be able to accept abnormal heat-conducting oil and supply normal heat-conducting oil to the heat-conducting oil supply system after the abnormal heat-conducting oil is discharged, thereby meeting the requirements for the timeliness of replacing the heat-conducting oil in the heat-conducting oil supply system, and the received abnormal heat-conducting oil can be regenerated to reduce the production cost of the enterprise. Summary of the Invention
[0005] In view of the deficiencies of the prior art, the utility model provides a heat-conducting oil regeneration device that can shorten the time required for replacing and regenerating the heat-conducting oil in the heat-conducting oil supply system and can regenerate the recovered heat-conducting oil, which is used to overcome the defects in the prior art.
[0006] The technical solution adopted by the utility model is as follows: A heat-conducting oil regeneration device includes at least two heat-conducting oil storage tanks, a reaction kettle, and a first main heat-conducting oil pipeline. A second main heat-conducting oil pipeline and a third main heat-conducting oil pipeline are arranged on the reaction kettle. First booster pumps are respectively arranged on both the first main heat-conducting oil pipeline and the second main heat-conducting oil pipeline. A first branch heat-conducting oil pipeline is correspondingly arranged between each heat-conducting oil storage tank and the first main heat-conducting oil pipeline, and a second branch heat-conducting oil pipeline is correspondingly arranged between each heat-conducting oil storage tank and the second main heat-conducting oil pipeline. A slag discharge pipe, a first stop valve, a second booster pump, a filter press, a buffer tank, a second stop valve, a third booster pump, and an online chromatograph are sequentially arranged on the third main heat-conducting oil pipeline along the direction from close to the reaction kettle to far from the reaction kettle. A third branch heat-conducting oil pipeline is correspondingly arranged between each heat-conducting oil storage tank and the third main heat-conducting oil pipeline. Third stop valves are respectively arranged on the first branch heat-conducting oil pipeline, the second branch heat-conducting oil pipeline, and the third branch heat-conducting oil pipeline. An online turbidity meter and a fourth stop valve are arranged on the slag discharge pipe.
[0007] Preferably, a sulfuric acid storage tank and an alkali storage tank are provided above the reactor. The sulfuric acid storage tank and the reactor, as well as the reactor and the alkali storage tank, are connected by liquid delivery pipes. The liquid delivery pipes are provided with a first regulating valve, a metering tank, and a second regulating valve in sequence along the direction from near the reactor to far away from the reactor.
[0008] Preferably, a clay storage tank is provided above the reactor, and the clay storage tank and the reactor are connected by a powder material conveying pipe. The powder material conveying pipe is provided with a first butterfly valve, a first feeder, a weighing tank, a second feeder, and a second butterfly valve in sequence along the direction from near the reactor to far away from the reactor.
[0009] Preferably, a support frame is provided on the outside of the reactor, and a weight sensor is provided between the support frame and the reactor. The number of weight sensors is several, and the several weight sensors are evenly distributed in a star shape on the outside of the central axis of the reactor. A pH sensor is provided inside the reactor.
[0010] Preferably, the reactor is provided with a steam discharge pipe, and a third regulating valve, a pressure sensor and a vacuum pump are sequentially arranged on the steam discharge pipe along the direction from near the reactor to far away from the reactor.
[0011] Preferably, each of the heat transfer oil storage tank, metering tank, and buffer tank is equipped with a venting valve, and each of the heat transfer oil storage tank, metering tank, buffer tank, sulfuric acid storage tank, and alkali storage tank is equipped with a liquid level sensor.
[0012] Preferably, the clay storage tank is equipped with a level gauge.
[0013] The beneficial effects of this utility model are as follows: First, by setting up several heat transfer oil storage tanks, this utility model can easily receive the heat transfer oil discharged from the heat transfer oil supply system and can promptly transport the regenerated heat transfer oil to the heat transfer oil supply system, which can shorten the time required for the heat transfer oil supply system to replace the regenerated heat transfer oil. The heat transfer oil that needs to be regenerated can be regenerated through the reaction vessel, and the acid sludge produced by adding sulfuric acid in the middle is discharged through the sludge discharge pipe. Moreover, an online turbidity meter is installed on the sludge discharge pipe to facilitate feedback on the discharge status of acid sludge, and a filter press is installed to facilitate solid-liquid separation, thereby realizing the separation of regenerated heat transfer oil and bleaching clay.
[0014] Secondly, the reactor described in this utility model is equipped with a steam discharge pipe, and a third regulating valve, a pressure sensor and a vacuum pump are sequentially arranged on the steam discharge pipe along the direction from near the reactor to far away from the reactor; the installation of the pressure sensor facilitates the feedback of pressure parameters.
[0015] Furthermore, the level gauge described in this utility model is located in the lower middle part of the clay storage tank, and the level gauge is used to provide feedback on the minimum usable level of clay stored in the clay storage tank.
[0016] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model.
[0018] Figure 2 for Figure 1 A magnified view of detail A.
[0019] Figure 3 for Figure 1 A magnified view of detail B. Detailed Implementation
[0020] like Figures 1 to 3 As shown, a heat transfer oil regeneration device includes at least two heat transfer oil storage tanks 1, a reaction vessel 2, and a first heat transfer oil main pipe 3. A second heat transfer oil main pipe 4 and a third heat transfer oil main pipe 5 are installed on the reaction vessel 2. A first booster pump 6 is installed on both the first heat transfer oil main pipe 3 and the second heat transfer oil main pipe 4. A first heat transfer oil branch pipe 7 is correspondingly installed between each heat transfer oil storage tank 1 and the first heat transfer oil main pipe 3. A second heat transfer oil branch pipe 8 is correspondingly installed between each heat transfer oil storage tank 1 and the second heat transfer oil main pipe 4. The third heat transfer oil main pipe... 5. Along the direction from near the reactor 2 to away from the reactor 2, a slag discharge pipe 9, a first shut-off valve 10, a second booster pump 11, a filter press 12, a buffer tank 13, a second shut-off valve 14, a third booster pump 15, and an online chromatograph 16 are arranged in sequence. A third heat transfer oil delivery branch pipe 17 is arranged between each heat transfer oil storage tank 1 and the third heat transfer oil delivery main pipe 5. A third shut-off valve 18 is arranged on the first heat transfer oil delivery branch pipe 7, the second heat transfer oil delivery branch pipe 8, and the third heat transfer oil delivery branch pipe 17 respectively. An online turbidity meter 19 and a fourth shut-off valve 20 are arranged on the slag discharge pipe 9.
[0021] A sulfuric acid storage tank 21 and an alkali storage tank 22 are installed above the reactor 2. The sulfuric acid storage tank 21 and the reactor 2, as well as the reactor 2 and the alkali storage tank 22, are connected by liquid conveying pipes 23. A first regulating valve 24, a metering tank 25, and a second regulating valve 26 are sequentially installed on the liquid conveying pipes 23 from near to far from the reactor 2. A clay storage tank 27 is installed above the reactor 2. The clay storage tank 27 and the reactor 2 are connected by a powder material conveying pipe 28. A first butterfly valve 29, a first feeder 30, a weighing tank 31, a second feeder 32, and a second butterfly valve 33 are sequentially installed on the powder material conveying pipe 28 from near to far from the reactor 2.
[0022] A support frame 34 is provided on the outside of the reactor 2. A weight sensor 35 is installed between the support frame 34 and the reactor 2. Several weight sensors 35 are arranged in a star shape and evenly distributed on the outside of the central axis of the reactor 2. Installing several weight sensors 35 facilitates the feedback of the weight parameters of the reactor 2 and the temporarily stored medium inside it. A pH sensor 43 is installed inside the reactor 2. The reactor 2 includes a reactor body and a jacket installed on the outside of the reactor body. A stirring device is installed on the reactor 2, which includes a stirring shaft installed on the reactor body, stirring blades installed on the stirring shaft inside the reactor body, and a stirring motor drivenly connected to the stirring shaft on the outside of the reactor body.
[0023] The reactor 2 is equipped with a steam discharge pipe 36. A third regulating valve 37, a pressure sensor 38 and a vacuum pump 39 are sequentially arranged on the steam discharge pipe 36 along the direction from near the reactor 2 to away from the reactor 2. The pressure sensor 38 is installed to facilitate the feedback of pressure parameters.
[0024] Each of the heat transfer oil storage tank 1, metering tank 25 and buffer tank 13 is equipped with a venting valve 40, and each of the heat transfer oil storage tank 1, metering tank 25 and buffer tank 13, sulfuric acid storage tank 21 and alkali storage tank 22 is equipped with a liquid level sensor 41; the installation of the liquid level sensor 41 facilitates the feedback of liquid level parameters.
[0025] The clay storage tank 27 is equipped with a level gauge 42, which is located in the lower middle part of the clay storage tank 27. The level gauge 42 is used to provide feedback on the minimum usable level of clay stored in the clay storage tank 27.
[0026] The usage instructions for this product are as follows: Figures 1 to 3 As shown, firstly, before the heat transfer oil regeneration step, the heat transfer oil in the upstream heat transfer oil supply system needs to be replaced, specifically including the following steps:
[0027] One of several heat transfer oil storage tanks 1 is kept empty, while another heat transfer oil storage tank 1 stores regenerated heat transfer oil. The upstream heat transfer oil supply system delivers the heat transfer oil to be replaced to the empty heat transfer oil storage tank 1. After the upstream heat transfer oil supply system has finished delivering the heat transfer oil to be replaced, the heat transfer oil storage tank 1 storing the regenerated heat transfer oil sequentially delivers the regenerated heat transfer oil to the upstream heat transfer oil supply system through the corresponding first heat transfer oil delivery branch pipe 7 and the first heat transfer oil delivery main pipe 3. After the regenerated heat transfer oil has been delivered, the heat transfer oil replacement process in the upstream heat transfer oil supply system is completed. The heat transfer oil that needs to be regenerated in the upstream system needs to complete the regeneration process before it can be put into use again. At this time, the heat transfer oil storage tank 1 delivers the heat transfer oil that needs to be regenerated to the reaction vessel 2 through the corresponding second heat transfer oil delivery branch pipe 8 and the second heat transfer oil delivery main pipe 4, completing the preparation work before the heat transfer oil regeneration. The specific heat transfer oil regeneration process includes the following steps:
[0028] S1. The sulfuric acid storage tank 21 is supplied with sulfuric acid after being metered by the corresponding metering tank 25 via the corresponding liquid delivery pipe 23. Then, the stirring device on the reactor 2 is turned on to mix the sulfuric acid supplied to the reactor body with the heat transfer oil that needs to be regenerated in the reactor body. Air is continuously supplied to the liquid layer in the reactor body through external equipment until a preset time is reached and then stopped. After standing for a preset time, the fourth shut-off valve 20 on the slag discharge pipe 9 is opened to discharge the slag at the bottom of the liquid layer in the reactor body. During this period, the online turbidity meter 19 on the slag discharge pipe 9 needs to be observed in time. When the value fed back by the online turbidity meter 19 reaches the preset range, the fourth shut-off valve 20 should be closed in time.
[0029] S2. Repeat step S1 for the preset number of times.
[0030] S3. The corresponding liquid delivery pipe 23 of the alkali storage tank 22 delivers a sodium hydroxide solution with a concentration of 3% to 5% after being quantitatively delivered by the corresponding metering tank 25. After the sodium hydroxide solution is added, the stirring device on the reactor 2 is turned on to mix the liquid layer delivered to the reactor body. Then, according to the information fed back by the pH sensor 43 in the reactor 2, the alkali storage tank 22 delivers a small amount of sodium hydroxide solution to the reactor body through the corresponding liquid delivery pipe 23 until the information fed back by the pH sensor 43 in the reactor 2 reaches the preset range.
[0031] S4. The clay storage tank 27 delivers a preset amount of clay, weighed by the weighing tank 31, into the liquid layer inside the reactor body of the reactor 2. Then, the stirring device on the reactor 2 is turned on to continuously stir the liquid layer and clay inside the reactor body. During this period, high-pressure steam at a preset pressure is delivered into the jacket of the reactor 2. The high-pressure steam continuously received by the jacket of the reactor 2 exchanges heat with the liquid layer inside the reactor body. During this period, the vacuum pump 39 is turned on and the opening of the third regulating valve 37 is adjusted so that the pressure parameter fed back by the pressure sensor 38 is within a preset range. The stirring device on the reactor 2 is kept stirring the liquid layer and clay inside the reactor body for a preset time.
[0032] S5. When the high-pressure steam received by the jacket of reactor 2 reaches the preset time range, the jacket of reactor 2 stops receiving high-pressure steam, but the stirring device on reactor 2 is still kept stirring the liquid layer and bleaching clay in the reactor body. When the liquid layer and bleaching clay in the reactor body drop to the preset temperature range, the suspension composed of the liquid layer and bleaching clay in the reactor body is transported to the third heat transfer oil main pipe 5 and pressurized by the second booster pump 11 before being transported to the filter press 12. The liquid phase after being filtered by the filter press 12 is transported to the buffer tank 13 for temporary storage. After the suspension composed of the liquid layer and bleaching clay in the reactor body has been transported and the liquid phase after being filtered by the filter press 12 has been transported to the buffer tank 13.
[0033] S6. Turn on the third booster pump 15 to deliver the regenerated heat transfer oil stored in the buffer tank 13 to an unloaded heat transfer oil storage tank 1. During this process, if the information fed back by the online chromatograph 16 is within the preset range, the heat transfer oil received by the heat transfer oil storage tank 1 via the buffer tank 13 is the regenerated heat transfer oil. If the information fed back by the online chromatograph 16 is outside the preset range, steps S1 to S5 need to be executed again to regenerate until the information fed back by the online chromatograph 16 is within the preset range.
[0034] This embodiment achieves the goal of receiving heat transfer oil discharged from the heat transfer oil supply system by setting up several heat transfer oil storage tanks 1, and can promptly transport regenerated heat transfer oil to the heat transfer oil supply system. This can shorten the time required for the heat transfer oil supply system to replace the regenerated heat transfer oil. The heat transfer oil that needs to be regenerated can be regenerated through the reaction vessel 2. The acid sludge generated by adding sulfuric acid in the middle is discharged through the sludge discharge pipe 9. Moreover, the sludge discharge pipe 9 is equipped with an online turbidity meter 19 to facilitate feedback on the discharge status of acid sludge. The filter press 12 is installed to facilitate solid-liquid separation, thereby realizing the separation of regenerated heat transfer oil and bleaching clay.
[0035] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.
Claims
1. A heat transfer oil regeneration device, characterized in that: The system includes at least two heat transfer oil storage tanks (1), a reactor (2), and a first heat transfer oil main pipe (3). A second heat transfer oil main pipe (4) and a third heat transfer oil main pipe (5) are installed on the reactor (2). A first booster pump (6) is installed on both the first heat transfer oil main pipe (3) and the second heat transfer oil main pipe (4). A first heat transfer oil branch pipe (7) is installed between each heat transfer oil storage tank (1) and the first heat transfer oil main pipe (3). A second heat transfer oil branch pipe (8) is installed between each heat transfer oil storage tank (1) and the second heat transfer oil main pipe (4). The third heat transfer oil main pipe (5) runs along the line close to the reactor (2). A slag discharge pipe (9), a first shut-off valve (10), a second booster pump (11), a filter press (12), a buffer tank (13), a second shut-off valve (14), a third booster pump (15), and an online chromatograph (16) are arranged sequentially in the direction away from the reactor (2). A third heat transfer oil branch pipe (17) is arranged between each heat transfer oil storage tank (1) and the third heat transfer oil main pipe (5). A third shut-off valve (18) is arranged on the first heat transfer oil branch pipe (7), the second heat transfer oil branch pipe (8), and the third heat transfer oil branch pipe (17). An online turbidity meter (19) and a fourth shut-off valve (20) are arranged on the slag discharge pipe (9).
2. The heat transfer oil regeneration device according to claim 1, characterized in that: A sulfuric acid storage tank (21) and an alkali storage tank (22) are provided above the reactor (2). The sulfuric acid storage tank (21) and the reactor (2) and the reactor (2) and the alkali storage tank (22) are respectively connected by a liquid delivery pipe (23). The liquid delivery pipe (23) is provided with a first regulating valve (24), a metering tank (25) and a second regulating valve (26) in sequence along the direction from near the reactor (2) to away from the reactor (2).
3. The heat transfer oil regeneration device according to claim 1, characterized in that: A clay storage tank (27) is provided above the reactor (2). The clay storage tank (27) and the reactor (2) are connected by a powder material conveying pipe (28). The powder material conveying pipe (28) is provided with a first butterfly valve (29), a first feeder (30), a weighing tank (31), a second feeder (32), and a second butterfly valve (33) in sequence along the direction from near the reactor (2) to away from the reactor (2).
4. The heat transfer oil regeneration device according to claim 1, characterized in that: A support frame (34) is provided on the outside of the reactor (2). A weight sensor (35) is provided between the support frame (34) and the reactor (2). The weight sensor (35) is a number of several. The weight sensors (35) are evenly distributed in a star shape on the outside of the central axis of the reactor (2). A pH sensor (43) is provided inside the reactor (2).
5. The heat transfer oil regeneration device according to claim 1, characterized in that: The reactor (2) is provided with a steam discharge pipe (36), and a third regulating valve (37), a pressure sensor (38) and a vacuum pump (39) are sequentially arranged on the steam discharge pipe (36) along the direction from near the reactor (2) to away from the reactor (2).
6. The heat transfer oil regeneration device according to claim 2, characterized in that: Each of the heat transfer oil storage tank (1), metering tank (25) and buffer tank (13) is equipped with an air exchange valve (40), and each of the heat transfer oil storage tank (1), metering tank (25), buffer tank (13), sulfuric acid storage tank (21) and alkali storage tank (22) is equipped with a liquid level sensor (41).
7. The heat transfer oil regeneration device according to claim 3, characterized in that: The clay storage tank (27) is equipped with a level gauge (42).