Quick heat exchanger for oil refining circulating water system

Abstract

The utility model discloses a kind of quick heat exchangers of oil refining circulating water system, which belongs to oil refining equipment technical field.It mainly includes rack, and it is characterized by: rack bottom rear fixedly connected sewage tank, first heat exchanger is fixedly connected in rack upper portion, heat exchange assembly connected with first heat exchanger is equipped in rack lower portion, heat exchange assembly includes compressor, gas-liquid separator and second heat exchanger, water circulation passage and fluorine road circulation passage are equipped in second heat exchanger, the water inlet of water circulation passage is communicated with oil refining circulating water outlet pipeline by water pump, the water outlet of water circulation passage is communicated with oil refining circulating water inlet pipeline and sewage tank respectively by three-way valve.The utility model additionally adds second heat exchanger and sewage tank, both solve the fouling problem of heat exchanger, avoid heat exchange efficiency to drop, realize resource secondary utilization again, improve economy, reduce pollutant emission.The utility model is mainly used for the quick heat exchange of oil refining circulating water in vacuum unit and the recovery of free fatty acid.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil refining equipment, and more specifically, it relates to a fast heat exchanger for an oil refining circulating water system. Background Technology

[0002] The refining process of animal fats mainly includes degumming, deacidification, decolorization, and deodorization. Deodorization, in particular, is carried out under high temperature and high vacuum, resulting in very high-temperature oil. Prolonged exposure to air at high temperatures makes the oil highly susceptible to oxidation and rancidity, affecting its quality, color, flavor, and shelf life. Therefore, after deodorization, the hot oil needs to be depressurized and cooled using a vacuum unit, reducing its temperature to 240-260℃.

[0003] Patent CN212585231U discloses a circulating water cooling system for a vacuum unit used for grease deodorization. The system includes a cooling tank, a compressor chiller, evaporator tubes, and a submersible pump. The evaporator tubes consist of an outer tube, an inner tube, and end plates. The inner tube is coaxially fitted inside the outer tube. The end plates are located at both ends of the evaporator tubes and are annular in shape. The inner side of the end plates connects to the inner tube, and the outer side connects to the outer tube. One end of the inner tube is connected to the water inlet of the cooling tank, and the other end is located at the bottom of the cooling tank. The outer tube has inlet and outlet pipes connected at both ends, both of which pass through the cooling tank and connect to the compressor chiller. This system changes the circulating water from being cooled in a cooling tower to being cooled by the compressor chiller. This prevents odor components discharged with the circulating water from being released into the atmosphere with the cooling tower water. Instead, the odor components are fixed in the circulating water and periodically discharged to a wastewater treatment plant for treatment, thus achieving zero exhaust emissions and improving air quality.

[0004] However, the above structure also has the following problems: 1. The evaporator tube has a vertical spiral nested inner and outer tube structure. The inner wall of the inner tube is prone to dirt accumulation due to impurities, grease residue, and odorous substances (free fatty acids) in the circulating water. In addition, the spiral structure results in a narrow internal space and many bends in the pipe, making it difficult for conventional cleaning tools to penetrate, making cleaning and maintenance difficult. The accumulation of dirt will continuously reduce heat exchange efficiency and affect the cooling effect. 2. The circulating water contains a large amount of acidic odorous substances (free fatty acids). These acidic substances will corrode the outer and inner tubes of the evaporator tube. At the same time, the submersible pump is immersed in the acidic circulating water for a long time, and its metal parts and seals are easily corroded, which can easily lead to leakage or failure, shorten the service life of the equipment, and increase the frequency of maintenance and replacement. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a fast heat exchanger for a refining circulating water system. It adds a second heat exchanger and a sewage tank, which not only solves the problem of scaling of the heat exchanger and avoids the decline in heat exchange efficiency, but also realizes the secondary utilization of resources, improves economic efficiency, and reduces pollutant emissions.

[0006] The aforementioned rapid heat exchanger for the oil refining circulating water system includes a frame, characterized in that: a wastewater tank is fixedly connected to the rear bottom of the frame, a first heat exchanger is fixedly connected to the upper part of the frame, and a heat exchange assembly connected to the first heat exchanger is provided at the lower part of the frame. The heat exchange assembly includes a compressor, a gas-liquid separator, and a second heat exchanger. The second heat exchanger is provided with a water circulation channel and a refrigerant circulation channel. The inlet of the water circulation channel is connected to the oil refining circulating water outlet pipe through a water pump, and the outlet of the water circulation channel is connected to the oil refining circulating water inlet pipe and the wastewater tank through a three-way valve.

[0007] Preferably, the compressor's outlet is connected to a four-way solenoid valve, which is connected to the inlet of the gas-liquid separator, the first heat exchanger, and the refrigerant circulation channel. The refrigerant circulation channel is connected to the first heat exchanger via a pipe, and an expansion valve is provided between the refrigerant circulation channel and the first heat exchanger.

[0008] Preferably, there are two sets of the first heat exchanger and the heat exchange assembly, with the two sets of first heat exchangers arranged symmetrically, and the bottom of the first heat exchanger is inclined towards the middle of the frame.

[0009] Preferably, a plurality of fans are fixedly connected to the top of the frame, and the fans are arranged opposite to the first heat exchanger.

[0010] Preferably, the gas-liquid separators in the two sets of heat exchange components are fixedly installed on both sides of the sewage tank, the two second heat exchangers are arranged side by side at the front end of the sewage tank, and the two compressors and water pumps are respectively installed on both sides of the second heat exchangers.

[0011] Preferably, the sewage tank includes a tank body, a fixed cover plate is sealed and fixedly connected to the top of the tank body near the middle of the frame, a sewage discharge hole is opened on the fixed cover plate, a three-way valve is sealed and connected to the sewage discharge hole through a sewage discharge pipe, and a movable cover plate is provided on the other side of the top of the tank body, and a handle is fixedly connected to the movable cover plate.

[0012] Preferably, the second heat exchanger is a plate heat exchanger.

[0013] Preferably, the first heat exchanger is a finned heat exchanger.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. A second heat exchanger and a wastewater tank are added. The second heat exchanger enables rapid heat exchange of the refinery's circulating water. Furthermore, addressing the tendency of free fatty acids to crystallize and deposit after cooling, the second heat exchanger has a large heat exchange area. The heat exchange components, by switching a four-way solenoid valve to change the flow direction of the fluorinated medium, achieve reverse heating of the second heat exchanger. Combined with circulating water containing alkali and surfactants, this efficiently dissolves the attached fatty acid layer. The wastewater tank enables efficient recovery of fatty acids, solving the problem of scale buildup in the heat exchanger, preventing a decrease in heat exchange efficiency, achieving resource reuse, improving economic efficiency, and reducing pollutant emissions.

[0016] 2. Two sets of first heat exchangers and heat exchange components are used in parallel, and the top fan accelerates the air flow, which significantly improves the overall heat exchange capacity of the system. It can meet the cooling requirements of large flow of oil refining circulating water and is suitable for different load conditions. The second heat exchanger uses the independent design of water circulation channel and fluorine circulation channel to efficiently transfer heat by utilizing the phase change of fluorine medium, which greatly improves the heat exchange rate.

[0017] 3. This utility model has a compact structure, with the gas-liquid separator, compressor, water pump, etc., arranged in an orderly manner around the sewage tank, reducing pipeline resistance and improving the stability of system operation. In addition, the connection of each component adopts standardized interfaces (such as three-way valves and sewage pipes), which makes disassembly and assembly convenient and reduces the later maintenance costs. Attached Figure Description

[0018] Figure 1 This is a front structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0020] Figure 3 This is a partial structural schematic diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the sewage tank.

[0022] Figure 5 This is a schematic diagram of the present invention.

[0023] In the diagram: 1. Frame; 2. Wastewater tank; 201. Drain valve; 202. Drain hole; 203. Fixed cover plate; 204. Movable cover plate; 205. Handle; 3. First heat exchanger; 4. Fan; 5. Gas-liquid separator; 6. Compressor; 7. Water pump; 8. Second heat exchanger; 801. Inlet; 802. Outlet; 803. Refrigerant circulation port one; 804. Refrigerant circulation port two; 9. Four-way solenoid valve; 10. Three-way valve; 11. Expansion valve. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Example 1:

[0027] like Figures 1 to 5 As shown, a rapid heat exchanger for an oil refining circulating water system includes a frame 1. The frame 1 serves as the basic support structure for the entire rapid heat exchanger, used to fix and support components such as the wastewater tank 2, the first heat exchanger 3, the heat exchange components, and the fan 4, ensuring the stability of each component during operation and preventing loose connections or structural deformation due to vibration or other factors.

[0028] Because the circulating water in the oil refining system contains free fatty acids, the temperature of the circulating water decreases during heat exchange. If the surface temperature of the heat exchanger metal is lower than the freezing point of the free fatty acids (e.g., palmitic acid at 63°C), the free fatty acids will crystallize and deposit, making them easily adhere to the inside of the second heat exchanger 8 during heat exchange. This reduces the heat transfer efficiency of the second heat exchanger 8 and affects the cooling efficiency of the circulating water. A wastewater tank 2 is fixedly connected to the rear bottom of the frame 1. In this embodiment, a wastewater tank 2 is added for periodically reversing the heating of the second heat exchanger 8 and using alkaline solutions and surfactants to clean the fatty acid layer inside the second heat exchanger 8. The wastewater tank 2 is mainly used to collect and temporarily store the fatty acid layer wastewater generated during system operation. At this time, the wastewater has a high fatty acid content, which facilitates the subsequent recovery and utilization of fatty acids, greatly improving economic value.

[0029] The first heat exchanger 3 is fixedly connected to the upper part of the frame 1. The first heat exchanger 3 is preferably a finned heat exchanger. As the main heat exchange component, the first heat exchanger 3 can realize the exchange and transfer of heat, and facilitate the dissipation of heat transferred from the refrigerant circulation channel or other components in the second heat exchanger 8, or absorb external heat according to the system operation mode, thereby regulating the temperature of the refrigerant medium.

[0030] like Figure 3 and Figure 5 As shown, the lower part of the frame 1 is provided with a heat exchange assembly connected to the first heat exchanger 3. The heat exchange assembly includes a compressor 6, a gas-liquid separator 5, and a second heat exchanger 8. The second heat exchanger 8 is preferably a plate heat exchanger.

[0031] The second heat exchanger 8 contains a water circulation channel and a fluorine circulation channel, which are completely isolated by a metal partition. Heat exchange occurs solely through the partition, preventing direct contact between the two media. The partition is coated with an anti-corrosion layer. Specifically, the water circulation channel allows the refinery's circulating water to flow, while the fluorine circulation channel facilitates the flow of the fluorine medium. The two media exchange heat within the second heat exchanger 8 through the partition structure, achieving heat transfer between the refinery's circulating water and the fluorine medium. This cools the refinery's circulating water or heats the water circulation channel to remove the fatty acid layer. The second heat exchanger 8 offers efficient heat exchange, high efficiency, small size, and a compact structure, making it suitable for achieving highly efficient heat exchange between the refinery's circulating water and the fluorine medium. Furthermore, the large heat exchange area of ​​the second heat exchanger 8 facilitates fatty acid recovery and allows for easy disassembly and cleaning.

[0032] Specifically, compressor 6, gas-liquid separator 5, and second heat exchanger 8 transfer heat through the circulation of fluorinated medium, working in conjunction with the first heat exchanger 3 to achieve rapid heat exchange treatment of the refinery circulating water. Specifically, the outlet of compressor 6 is connected to a four-way solenoid valve 9. Compressing the fluorinated medium increases its pressure and temperature, enhancing its heat exchange capacity. The four-way solenoid valve 9 can change the flow direction of the fluorinated medium, switching between different connection paths to achieve system cooling or heating modes, adapting to the temperature regulation requirements of the refinery circulating water. The four-way solenoid valve 9 is connected to the inlet of the gas-liquid separator 5, the first heat exchanger 3, and the refrigerant circulation channel. By switching the four-way solenoid valve 9, the high-temperature and high-pressure refrigerant discharged from the compressor 6 can be selectively transported to the gas-liquid separator 5, the first heat exchanger 3, or the refrigerant circulation channel. The gas-liquid separator 5 can separate the refrigerant into gas and liquid, ensuring that the refrigerant entering the subsequent components is in a stable state. At the same time, it realizes the circulation of the refrigerant between different components, completing the heat transfer and conversion. The outlet of the gas-liquid separator 5 is connected to the inlet of the compressor 6 through a pipeline, forming a complete circulation loop for the refrigerant.

[0033] The refrigerant circulation channel is connected to the first heat exchanger 3 via a pipe, and an expansion valve 11 is installed between the refrigerant circulation channel and the first heat exchanger 3. The two ends of the refrigerant circulation channel are respectively provided with a refrigerant circulation port 1 (803) and a refrigerant circulation port 2 (804). Refrigerant circulation port 1 (803) is connected to a four-way solenoid valve 9, and refrigerant circulation port 2 (804) is connected to the expansion valve 11 via a pipe. The refrigerant circulation channel and the first heat exchanger 3 form a refrigerant circulation loop. The expansion valve 11 can reduce the pressure and temperature of the refrigerant, ensuring that the refrigerant is in a suitable state for heat exchange when entering the first heat exchanger 3 or the refrigerant circulation channel, thereby improving heat exchange efficiency.

[0034] The inlet 801 of the water circulation channel is connected to the oil refining circulating water outlet pipe via a water pump 7. The water pump 7 provides power for the oil refining circulating water to enter the water circulation channel of the second heat exchanger 8, drawing the circulating water from the oil refining circulating water outlet pipe into the water circulation channel to ensure that the circulating water can flow continuously and stably in the channel to meet the heat exchange requirements. The outlet 802 of the water circulation channel is connected to the oil refining circulating water inlet pipe and the wastewater tank 2 via a three-way valve 10. The three-way valve 10 serves to switch the water flow direction. When the vacuum unit needs to be cooled, the oil refining circulating water after heat exchange treatment connects the outlet 802 of the water circulation channel to the oil refining circulating water inlet pipe through the three-way valve 10, allowing the circulating water to re-enter the oil refining system for recycling. When the second heat exchanger 8 needs to be cleaned, the three-way valve 10 is switched to connect the outlet 802 to the wastewater tank 2, discharging the cleaning wastewater into the wastewater tank 2 for subsequent fatty acid recovery.

[0035] Example 2:

[0036] A rapid heat exchanger for an oil refining circulating water system comprises two sets of first heat exchangers 3 and heat exchange components. The two sets of first heat exchangers 3 and heat exchange components can improve the heat exchange efficiency and processing capacity of the system, meeting the heat exchange requirements of larger flow rates of oil refining circulating water. The two sets of first heat exchangers 3 are symmetrically arranged, which makes the structural layout of this utility model more reasonable and the stress more balanced. Furthermore, the bottom of each first heat exchanger 3 is inclined towards the middle of the frame 1, which on the one hand increases the heat exchange area between the air and the first heat exchanger 3, improving the heat exchange efficiency, and on the other hand, facilitates the smooth flow of liquids such as condensate, avoiding accumulation at the bottom of the first heat exchanger 3 and affecting the heat exchange effect.

[0037] Multiple fans 4 are fixedly connected to the top of the frame 1. The fans 4 are arranged opposite to the first heat exchanger 3, that is, the air outlet of the fans 4 is perpendicular to the fin surface of the first heat exchanger 3. When the fans 4 are working, they generate airflow, which accelerates the airflow speed around the first heat exchanger 3, promotes the heat exchange between the first heat exchanger 3 and the outside air, improves the heat dissipation or heat absorption efficiency of the first heat exchanger 3, and ensures that it can quickly and effectively regulate the temperature of the fluorine medium.

[0038] The gas-liquid separators 5 in the two heat exchange components are fixedly installed on both sides of the sewage tank 2, and the two second heat exchangers 8 are arranged side by side at the front end of the sewage tank 2. The two compressors 6 and the water pump 7 are respectively installed on both sides of the second heat exchangers 8. This layout allows the components to be evenly distributed on the frame 1, saving installation space. It also facilitates the connection of pipes between the components, reduces pipe length and resistance, improves the stability and reliability of system operation, and facilitates the maintenance and repair of the components in the future.

[0039] The wastewater tank 2 includes a tank body. A fixed cover plate 203 is sealed and fixedly connected to the top of the tank body near the middle of the frame 1. The fixed cover plate 203 seals the corresponding position of the tank body to prevent wastewater from splashing out or odors from escaping. A drain hole 202 is provided on the fixed cover plate 203, ensuring a sealed connection between the drain pipe and the wastewater tank 2. A three-way valve 10 is sealed to the drain hole 202 via the drain pipe, allowing discharged wastewater to directly enter the wastewater tank, preventing leakage and avoiding environmental pollution and water waste. A movable cover plate 204 is provided on the other side of the top of the tank body. The movable cover plate 204 covers the area of ​​the top of the tank body not covered by the fixed cover plate 203. A handle 205 is fixedly connected to the movable cover plate 204. The movable cover plate 204 can be opened for easy cleaning, inspection, and maintenance of the inside of the wastewater tank 2. The handle 205 facilitates the operation of the operator by opening and closing the movable cover plate 204, improving ease of operation.

[0040] The rear end of the water tank is connected to a drain outlet, on which a drain valve 201 is installed. In use, the drain outlet is connected to the recycling mechanism via a pipe and a pump. The drain valve 201 is used to control the opening and closing of the drain outlet and the flow rate. Everything else is the same as in Embodiment 1.

[0041] Working principle:

[0042] Two sets of heat exchange components share a single wastewater tank 2. During use, the two sets of heat exchange components can be used simultaneously or one of them can be used selectively. In particular, when the second heat exchanger 8 in one set of heat exchange components needs to be cleaned, the other set of heat exchange components can be used alone to cool the refining circulating water.

[0043] When cooling of the vacuum unit is required, water pump 7, compressor 6, and fan 4 are started. Circulating water in the refinery's circulating water outlet pipe, driven by water pump 7, enters the water circulation channel of the second heat exchanger 8 through inlet 801. Simultaneously, the fluorinated medium is compressed into a high-temperature, high-pressure gaseous state by compressor 6. This gaseous fluorinated medium enters the four-way solenoid valve 9 from the outlet, which then transports it to the first heat exchanger 3. Fan 4 blows air into the first heat exchanger 3 to cool it, lowering the temperature of the fluorinated medium. The fluorinated medium then passes through expansion valve 11, which further reduces its pressure and temperature, transforming it into a low-temperature, low-pressure liquid. The liquid fluorinated medium then enters the fluorinated circulation channel through fluorinated circulation port 804, exchanging heat with the refinery's circulating water in the second heat exchanger 8. The fluorinated medium absorbs heat from the refinery's circulating water, lowering its temperature. The cooled circulating water then enters the vacuum unit for further cooling and heat exchange, thus reducing the pressure and temperature of the high-temperature oil. Finally, the fluorinated medium after heat exchange is discharged through the fluorinated circuit circulation port 803 and enters the gas-liquid separator 5 for gas-liquid separation, and then returns to the compressor 6 to form a fluorinated medium circulation.

[0044] When it is necessary to clean the second heat exchanger 8 and recover the fatty acid layer inside it, a certain proportion of alkali and surfactant is added to the refining circulating water entering the inlet of the water pump 7. Simultaneously, the four-way solenoid valve 9 changes the flow direction of the fluorine medium, allowing the high-temperature, high-pressure gaseous fluorine medium from the compressor 6 to first enter the fluorine circulation channel through the fluorine circulation port 803 to exchange heat with the refining circulating water. At this time, the refining circulating water absorbs the heat from the fluorine medium, causing its temperature to rise, dissolving the fatty acid layer inside the second heat exchanger 8. This dissolved layer then circulates with the refining circulating water. The three-way valve 10 is controlled to allow the refining circulating water containing a large amount of fatty acids to flow into the wastewater tank 2, thus recovering the fatty acids. After cleaning, the alkali and surfactant addition device is turned off, and the inside of the second heat exchanger 8 is flushed with refining circulating water. Then, the three-way valve 10 can be switched to restore normal refrigeration operation.

[0045] After the fluorinated medium exchanges heat with the refining circulating water, its temperature decreases and it is discharged through the fluorinated circuit circulation port 804. Then it flows through the expansion valve 11, which throttles and cools the fluorinated medium, turning it into a low-temperature, low-pressure liquid. The liquid fluorinated medium enters the first heat exchanger 3, absorbs heat from the air and vaporizes. Finally, after gas-liquid separation by the gas-liquid separator 5, it returns to the compressor 6, and so on in a cycle.

[0046] In addition, after the work is completed, the second heat exchanger 8 can be disassembled periodically. The plate heat exchanger has a layered structure inside, which is convenient for installation and disassembly, so that the grooves inside the layered plate can be cleaned in detail, making maintenance more convenient.

[0047] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rapid heat exchanger for an oil refining circulating water system, comprising a frame (1), characterized in that: The bottom rear of the frame (1) is fixedly connected to the sewage tank (2). The upper part of the frame (1) is fixedly connected to the first heat exchanger (3). The lower part of the frame (1) is provided with a heat exchange assembly connected to the first heat exchanger (3). The heat exchange assembly includes a compressor (6), a gas-liquid separator (5), and a second heat exchanger (8). The second heat exchanger (8) is provided with a water circulation channel and a fluorine circulation channel. The inlet (801) of the water circulation channel is connected to the oil refining circulating water outlet pipe through a water pump (7). The outlet (802) of the water circulation channel is connected to the oil refining circulating water inlet pipe and the sewage tank (2) through a three-way valve (10).

2. The rapid heat exchanger for an oil refining circulating water system according to claim 1, characterized in that: The compressor (6) has a four-way solenoid valve (9) connected to its outlet. The four-way solenoid valve (9) is connected to the inlet of the gas-liquid separator (5), the first heat exchanger (3), and the refrigerant circulation channel. The refrigerant circulation channel is connected to the first heat exchanger (3) through a pipe, and an expansion valve (11) is provided between the refrigerant circulation channel and the first heat exchanger (3).

3. The rapid heat exchanger for an oil refining circulating water system according to claim 2, characterized in that: The first heat exchanger (3) and the heat exchange components are both in two sets. The two sets of first heat exchangers (3) are symmetrically arranged, and the bottom of the first heat exchangers (3) is inclined towards the middle of the frame (1).

4. A rapid heat exchanger for an oil refining circulating water system according to claim 3, characterized in that: Multiple fans (4) are fixedly connected to the top of the frame (1), and the fans (4) are arranged opposite to the first heat exchanger (3).

5. A rapid heat exchanger for an oil refining circulating water system according to claim 3, characterized in that: The gas-liquid separators (5) in the two sets of heat exchange components are fixedly installed on both sides of the sewage tank (2), the two second heat exchangers (8) are arranged side by side at the front end of the sewage tank (2), and the two compressors (6) and the water pump (7) are respectively installed on both sides of the second heat exchangers (8).

6. A rapid heat exchanger for an oil refining circulating water system according to any one of claims 1 to 5, characterized in that: The sewage tank (2) includes a tank body. A fixed cover plate (203) is sealed and fixedly connected to the top of the tank body near the middle of the frame (1). A drain hole (202) is opened on the fixed cover plate (203). A three-way valve (10) is sealed and connected to the drain hole (202) through a drain pipe. A movable cover plate (204) is provided on the other side of the top of the tank body. A handle (205) is fixedly connected to the movable cover plate (204).

7. A rapid heat exchanger for an oil refining circulating water system according to claim 6, characterized in that: The second heat exchanger (8) is a plate heat exchanger.

8. A rapid heat exchanger for an oil refining circulating water system according to claim 6, characterized in that: The first heat exchanger (3) is a finned heat exchanger.

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