Oil fume purifier and oil discharge control method and oil discharge structure thereof

Abstract

The invention discloses an oil smoke purifier and an oil discharge control method and an oil discharge structure thereof, and the oil discharge control method comprises the following steps: obtaining real-time liquid level information, when the real-time liquid level information is greater than or equal to a preset working liquid level threshold value, controlling a steam switch valve to be opened at a preset initial opening degree, and setting the duration as a preset first working duration; acquiring the real-time temperature of the oil stain and the real-time temperature of the introduced steam; adjusting the actual working opening degree of a steam switch valve based on the real-time oil stain temperature and the real-time steam temperature; and when the real-time liquid level information is smaller than or equal to the preset low liquid level threshold value, the steam switch valve is controlled to be closed by delaying the preset second working duration. According to the method disclosed by the invention, the heating time and process are accurately controlled, so that the oil discharge channel is effectively prevented from being frozen and blocked by oil stains, and unnecessary energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of fume purifiers, and particularly to a fume purifier and its oil discharge control method and oil discharge structure. Background Technology

[0002] In industrial production, fume purifiers are key equipment for treating oil fume pollution. Their core working principle is to purify oil fumes using electrostatic separation technology. When the flue gas enters the fume purifier, it passes through several electrostatic purification modules. Under the influence of an electrostatic field, the particulate matter in the oil fume becomes charged and is adsorbed by the electrodes within the field, thus separating the oil fume from the clean gas. The purified gas is discharged through the exhaust end of the fume purifier, while the adsorbed oil gradually drips into the oil collection tank at the bottom of the purifier under gravity.

[0003] The main function of the oil collection tank is to collect dripping oil, which is then discharged directly through the oil drain pipe. This drain pipe is connected to a pressure-maintaining pipe, using pressure difference to automatically discharge the oil and ensure the airtightness of the fume purifier. However, in areas or seasons with low ambient temperatures, the oil in the collection tank can easily freeze into lumps due to the low temperature. This can cause blockage of the drain channel, hindering normal oil discharge and causing oil to continuously accumulate in the collection tank.

[0004] As oil accumulates and its height increases, it may enter the electrostatic field area of ​​the fume purifier. During the discharge process of the electrostatic field, the released electric sparks can easily ignite the accumulated oil, leading to a fire. This seriously threatens the safe operation of the equipment and the safety of the production environment.

[0005] To address the aforementioned issue of freezing at low temperatures, current fume purifiers used in cold regions typically incorporate heating devices within the bottom oil collection tank. Common heating methods include steam heating, electric heating, and high-temperature water heating. These devices continuously heat the oil in the collection tank, maintaining its temperature above its freezing point to prevent freezing. However, this continuous heating method results in a significant waste of energy.

[0006] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide an oil fume purifier and its oil discharge control method and oil discharge structure, which aims to solve the technical problem of energy waste caused by continuous heating of oil in the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for controlling oil discharge in an oil fume purifier includes:

[0010] Acquire real-time liquid level information. When the real-time liquid level information is greater than or equal to the preset working liquid level threshold, control the steam switch valve to open at the preset initial opening degree for a duration of the preset first working duration.

[0011] Obtain the real-time temperature of the oil stains and the real-time temperature of the introduced steam;

[0012] Adjust the actual operating opening of the steam switch valve based on the real-time temperature of the oil and steam.

[0013] A preset temperature rise threshold for oil sludge is set. When the rate of temperature rise of the oil sludge is less than the preset temperature rise threshold, the operating opening of the steam switch valve is increased. When the rate of temperature rise of the oil sludge is greater than the preset temperature rise threshold, the current operating opening of the steam switch valve is maintained.

[0014] When the real-time liquid level information is less than or equal to the preset low liquid level threshold, the control steam switch valve is closed after a preset second working time.

[0015] Furthermore, the adjustment of the actual operating opening of the steam switching valve based on the real-time temperature of the oil and the real-time temperature of the steam specifically includes:

[0016] Based on the real-time steam temperature, the heating mode is determined, including a low-temperature heating mode, a medium-temperature heating mode, and a high-temperature heating mode.

[0017] When the real-time temperature of the oil stain is ≤5℃ and the real-time temperature of the steam is in low-temperature heating mode, the preset first working opening of the steam switch valve is obtained.

[0018] When the real-time temperature of the oil sludge is ≤5℃ and the real-time temperature of the steam is in the medium-temperature heating mode, the preset second working opening of the steam switch valve is obtained.

[0019] When the real-time temperature of the oil stain is ≤5℃ and the real-time temperature of the steam is in high-temperature heating mode, the preset third working opening of the steam switch valve is obtained.

[0020] When 5℃ < real-time oil temperature ≤ 15℃, and the real-time steam temperature is in low-temperature heating mode, obtain the preset fourth working opening degree of the steam switch valve;

[0021] When 5℃ < real-time oil temperature ≤ 15℃, and the real-time steam temperature is in medium-temperature heating mode, obtain the preset fifth working opening of the steam switch valve;

[0022] When 5℃ < real-time oil temperature ≤ 15℃, and the real-time steam temperature is in high-temperature heating mode, obtain the preset sixth working opening of the steam switch valve;

[0023] When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in low-temperature heating mode, obtain the preset seventh working opening of the steam switch valve;

[0024] When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in medium-temperature heating mode, obtain the preset eighth working opening of the steam switch valve;

[0025] When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in high-temperature heating mode, obtain the preset ninth working opening degree of the steam switch valve.

[0026] Furthermore, the method of delaying the closing of the control steam switch valve for a preset second working time further includes: acquiring the real-time ambient temperature, and extending the preset second working time when the real-time ambient temperature is less than or equal to the preset ambient temperature.

[0027] Furthermore, it also includes: controlling the fume purifier to shut down when the real-time liquid level information is greater than or equal to the preset high liquid level threshold.

[0028] An oil discharge structure for an oil fume purifier is disclosed, wherein the oil discharge structure is controlled by the oil discharge control method of the oil fume purifier. The oil discharge structure includes a housing, a steam inlet pipe, and a steam outlet pipe. An oil collection trough is provided at the bottom of the housing, arranged parallel to each other along the direction of flue gas flow. The oil collection trough is used to collect oil sludge generated by the oil fume purifier. A liquid level sensor and a first temperature sensor are provided within the oil collection trough. The liquid level sensor is used to detect the real-time liquid level of the oil sludge in the oil collection trough, and the first temperature sensor is used to detect the real-time temperature of the oil sludge. Each oil collection trough is provided with a steam heating pipe, and steam in the steam inlet pipe flows to the steam heating pipe and is discharged through the steam outlet pipe. A steam switch valve and a second temperature sensor are provided on the steam inlet pipe. The second temperature sensor is used to detect the real-time temperature of the incoming steam. An oil discharge pipe is connected to the bottom of each oil collection trough.

[0029] Furthermore, the steam heating pipe includes a first straight segment, a second straight segment, and a bent pipe segment connecting the first straight segment and the second straight segment, and the first straight segment is parallel to the second straight segment; a plurality of first heat-conducting plates are welded to the upper surface of the first straight segment at intervals, and a plurality of second heat-conducting plates are welded to the upper surface of the second straight segment at intervals, and the plurality of first heat-conducting plates and second heat-conducting plates are staggered.

[0030] Furthermore, the steam heating pipes in the multiple oil collection tanks are connected in parallel, and the liquid level sensor and the first temperature sensor are located in the oil collection tank near the flue gas inlet.

[0031] Furthermore, the steam heating pipes in the multiple oil collection tanks are connected in series, the liquid level sensor is located in the oil collection tank near the flue gas inlet, and the first temperature sensor is located in the oil collection tank near the flue gas outlet.

[0032] Furthermore, the oil collecting trough has an inverted T-shaped cross-section, and an inclined plate is provided at the bottom of the oil collecting trough. The oil drain pipe is located at the inclined end of the inclined plate.

[0033] An oil fume purifier includes an oil discharge structure.

[0034] Beneficial effects:

[0035] This invention provides an oil fume purifier and its oil discharge control method and structure. It adopts an intermittent steam heating method to avoid energy waste caused by continuous heating. Heating is only activated when the oil accumulates to a level that requires treatment, so that the steam energy is concentrated on the necessary steps. At the same time, by accurately controlling the timing and process of heating, it can effectively prevent the oil from freezing and clogging the oil discharge channel, and reduce unnecessary energy consumption. Ultimately, it achieves the dual benefits of energy saving and stable equipment operation, and is suitable for long-term stable use in low-temperature environments. Attached Figure Description

[0036] Figure 1 A logic flowchart of the oil fume purifier oil discharge control method provided by the present invention;

[0037] Figure 2 This is a front view of the oil exhaust structure of the oil fume purifier provided by the present invention;

[0038] Figure 3 A schematic diagram of the connection of the steam heating pipe in the oil exhaust structure of the oil fume purifier provided by the present invention. Figure 1 ;

[0039] Figure 4 A schematic diagram of the connection of the steam heating pipe in the oil exhaust structure of the oil fume purifier provided by the present invention. Figure 2 ;

[0040] Figure 5 A partial exploded view of the oil discharge structure of the oil fume purifier provided by the present invention.

[0041] Reference numerals: 1. Housing; 2. Steam inlet pipe; 21. Steam switch valve; 22. Second temperature sensor; 23. Connecting pipe; 3. Steam outlet pipe; 4. Oil collection tank; 41. Inclined plate; 5. Liquid level sensor; 6. First temperature sensor; 7. Steam heating pipe; 71. First straight section; 72. Second straight section; 73. Bend section; 74. First heat-conducting plate; 75. Second heat-conducting plate; 8. Oil drain pipe. Detailed Implementation

[0042] This invention provides an oil fume purifier, its oil discharge control method, and its oil discharge structure. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0043] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0044] Please see Figure 1 As shown, the present invention provides a method for controlling the oil discharge of an oil fume purifier, comprising:

[0045] 101. Obtain real-time liquid level information. When the real-time liquid level information is greater than or equal to the preset working liquid level threshold, control the steam switch valve 21 to open at the preset initial opening degree for a duration of the preset first working duration.

[0046] In this embodiment, the real-time liquid level information is used to reflect the amount of oil accumulated in the oil collection tank 4. A preset working liquid level threshold is set to determine whether steam heating needs to be started. The threshold is set at 70% of the height of the oil collection tank 4. When the real-time liquid level information is greater than or equal to the preset working liquid level threshold, it indicates that the amount of oil accumulated has reached the level that needs to be treated. At this time, the steam switch valve 21 is controlled to open at a preset initial opening, and the duration of this initial opening is a preset first working time. The preset initial opening is 20% of the total opening of the steam switch valve 21, and the first working time is set to 1 minute. Steam is introduced slowly at a small flow rate to avoid instantaneous impact that could cause vibration of the equipment and corresponding pipelines, while also preheating the pipelines.

[0047] 102. Obtain the real-time temperature of the oil stains and the real-time temperature of the introduced steam;

[0048] In this embodiment, the real-time temperature of the oil sludge is acquired by a first temperature sensor 6 installed inside the oil collection tank 4. This temperature information reflects the current state of the oil sludge, i.e., the freezing status is determined by the real-time temperature of the oil sludge, providing a temperature basis for subsequent steam flow regulation. Simultaneously, the real-time temperature of the incoming steam is acquired by a second temperature sensor 22 installed on the steam inlet pipe 2. This temperature information reflects the heating capacity of the steam, ensuring that the incoming steam meets the requirements for heating and dissolving the oil sludge. Both serve as key parameters for subsequently controlling the opening degree of the steam switching valve 21, allowing for precise adjustment of the steam supply based on actual temperature conditions, achieving efficient heating and avoiding energy waste.

[0049] It should be noted that in most cases, the freezing point of oil is around 20℃, and the specific freezing point parameters are determined through experiments and data analysis; and the steam introduced can be recycled low-temperature steam that has participated in the production, with a temperature generally around 90℃-150℃; using recycled low-temperature steam can, on the one hand, make full use of the waste heat generated in the production process, improve the comprehensive utilization rate of energy, and reduce energy waste; on the other hand, compared with using newly generated steam, it can reduce the steam preparation cost, thereby saving overall operating costs.

[0050] 103. Adjust the actual operating opening of the steam switch valve 21 based on the real-time temperature of the oil and the real-time temperature of the steam.

[0051] In this embodiment, the operating opening of the steam switch valve 21 is determined based on the real-time temperature of the oil and the real-time temperature of the steam, thereby inputting a reasonable amount of steam. Specifically, the operation is dynamically adjusted based on the temperature of both: when the real-time temperature of the oil is low and the degree of freezing is high, and the real-time temperature of the steam is within the effective heating range, the operating opening of the steam switch valve 21 is appropriately increased to increase the steam flow and accelerate the thawing of the oil; when the real-time temperature of the oil gradually approaches the freezing point, and the real-time temperature of the steam is within the effective heating range, the operating opening of the steam switch valve 21 is correspondingly reduced to avoid excessive steam input (avoiding overheating). In this way, it is possible to ensure that the oil thaws within a reasonable time while minimizing steam consumption, achieving a balance between energy saving and efficient oil discharge.

[0052] 104. Preset the temperature rise threshold of the oil sludge; when the oil sludge temperature rise rate is less than the preset temperature rise threshold, increase the working opening of the steam switch valve 21; when the oil sludge temperature rise rate is greater than the preset temperature rise threshold, maintain the current working opening of the steam switch valve 21.

[0053] In this embodiment, the preset oil temperature rise threshold is determined through experiments and data analysis, taking into account factors such as the physical properties of the oil (e.g., freezing point), steam heating efficiency, and expected thawing time. Specifically, it can be set to 2°C / min. This threshold directly reflects the effect of the current steam flow rate on oil heating: when the oil temperature rise rate is less than this threshold, it indicates insufficient steam flow and low heating efficiency, making it difficult to thaw the oil within the expected time. In this case, the operating opening of the steam valve 21 is increased, specifically to 1.2 times the current operating opening, to increase the steam flow rate and improve the heating rate, ensuring timely thawing and discharge of the oil. When the oil temperature rise rate is greater than this threshold, it indicates that the current steam flow rate is sufficient for heating. Further increasing the opening may lead to energy waste or overheating of the oil. Therefore, the current operating opening of the steam valve 21 is maintained, achieving energy saving while ensuring thawing efficiency. Through this dynamic adjustment based on the heating rate, the steam supply is further optimized, making the heating process more closely match the actual needs of oil thawing.

[0054] 105. When the real-time liquid level information is less than or equal to the preset low liquid level threshold, control the steam switch valve 21 to close after a preset second working time.

[0055] In this embodiment, the preset low liquid level threshold is a critical value for determining whether oil discharge is close to completion. It is set slightly higher than the bottom of the oil collection tank 4 to ensure that subsequent operations can still be triggered even when a small amount of oil remains. When the real-time liquid level drops below this threshold, it indicates that most of the oil has been discharged, but some residual oil may still be frozen due to insufficient temperature. Therefore, the steam switch valve 21 is closed with a preset second working time delay. This time can be set according to factors such as the amount of residual oil, ambient temperature, and steam heating effect, specifically 1-2 minutes. During the delayed closure period, the continuously supplied steam can heat the oil collection tank 4 and the residual oil, ensuring that the residual oil is fully dissolved and discharged with the residual heat, maintaining a smooth oil discharge channel. This delayed closure mechanism ensures thorough oil discharge without wasting energy due to excessively prolonged heating time, further improving the reliability of oil discharge control.

[0056] In practical operation, frozen oil is melted by steam heating and discharged through the oil drain pipe 8. However, due to the low temperature environment, the oil is prone to refreezing. Therefore, after a single heating to melt the frozen oil, it will accumulate again to a certain height after a period of time. When the accumulation height reaches a preset value, i.e., the real-time liquid level information is greater than or equal to the preset working liquid level threshold, a new round of melting and freezing of the oil is initiated. This intermittent heating method avoids the energy loss caused by continuous heating. Heating is only activated when the oil accumulates to a level that requires treatment, allowing the steam energy to be concentrated on the necessary heating stages. At the same time, by precisely controlling the heating timing and process, it can effectively prevent the oil from freezing and clogging the oil drain channel, and reduce unnecessary energy consumption, achieving the dual goals of energy saving and stable equipment operation. It is especially suitable for long-term use in low-temperature environments.

[0057] In a preferred embodiment, adjusting the actual operating opening of the steam switch valve 21 based on the real-time temperature of the oil and the real-time temperature of the steam specifically includes:

[0058] 201. Based on the real-time steam temperature, determine the heating mode, which includes a low-temperature heating mode, a medium-temperature heating mode, and a high-temperature heating mode. In this embodiment, the temperature range of the introduced steam is typically 90-150℃ (i.e., the heating temperature that can be provided by the recovered low-grade steam). Specifically, the temperature of the introduced steam in the low-temperature heating mode is 90℃-110℃; the temperature of the introduced steam in the medium-temperature heating mode is 110℃-130℃; and the temperature of the introduced steam in the high-temperature heating mode is 130℃-150℃. The heating mode can be classified according to the specific steam temperature available in the production environment.

[0059] 202. When the real-time temperature of the oil sludge is ≤5℃ and the real-time temperature of the steam is in low-temperature heating mode, the preset first working opening of the steam switch valve 21 is obtained; specifically, the preset first working opening is 70% of the total opening of the steam switch valve 21.

[0060] 203. When the real-time temperature of the oil sludge is ≤5℃ and the real-time temperature of the steam is in the medium-temperature heating mode, the preset second working opening of the steam switch valve 21 is obtained; specifically, the preset second working opening is 60% of the total opening of the steam switch valve 21.

[0061] 204. When the real-time temperature of the oil sludge is ≤5℃ and the real-time temperature of the steam is in high-temperature heating mode, the preset third working opening of the steam switch valve 21 is obtained; specifically, the preset third working opening is 50% of the total opening of the steam switch valve 21.

[0062] 205. When 5℃ < real-time oil temperature ≤ 15℃ and the real-time steam temperature is in low-temperature heating mode, obtain the preset fourth working opening of the steam switch valve 21; specifically, the preset fourth working opening is 50% of the total opening of the steam switch valve 21.

[0063] 206. When 5℃ < real-time oil temperature ≤ 15℃ and the real-time steam temperature is in medium-temperature heating mode, obtain the preset fifth working opening of the steam switch valve 21; specifically, the preset fifth working opening is 45% of the total opening of the steam switch valve 21.

[0064] 207. When 5℃ < real-time oil temperature ≤ 15℃ and the real-time steam temperature is in high-temperature heating mode, obtain the preset sixth working opening of the steam switch valve 21; specifically, the preset sixth working opening is 40% of the total opening of the steam switch valve 21.

[0065] 208. When 15℃ < real-time oil temperature ≤ 22℃ and the real-time steam temperature is in low-temperature heating mode, obtain the preset seventh working opening of the steam switch valve 21; specifically, the preset seventh working opening is 40% of the total opening of the steam switch valve 21.

[0066] 209. When 15℃ < real-time oil temperature ≤ 22℃ and the real-time steam temperature is in medium-temperature heating mode, obtain the preset eighth working opening of the steam switch valve 21; specifically, the preset eighth working opening is 35% of the total opening of the steam switch valve 21.

[0067] 210. When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in high-temperature heating mode, obtain the preset ninth working opening of the steam switch valve 21; specifically, the preset ninth working opening is 30% of the total opening of the steam switch valve 21.

[0068] In actual operation, a stepped opening value was set according to the different freezing degrees of the oil sludge at real-time temperature and the temperature difference of the steam heating mode. By precisely matching the freezing degree of the oil sludge with the steam heating capacity, it can ensure efficient thawing when the oil sludge is frozen deeply, and can also reduce the opening in a timely manner as the oil sludge temperature or steam temperature rises to reduce steam consumption. At the same time, it takes into account the adaptability to different steam supply environments. Ultimately, it achieves an organic unity of energy saving and efficient heating while ensuring smooth oil drainage.

[0069] In a preferred embodiment, the control steam switching valve 21 is delayed in closing for a preset second working time, specifically including:

[0070] The system acquires the real-time ambient temperature. When the real-time ambient temperature is less than or equal to the preset ambient temperature, the preset second working time is extended. The preset ambient temperature serves as a critical value for determining whether low ambient temperature affects the dissolution of residual oil. When the real-time ambient temperature is less than or equal to the preset ambient temperature, it indicates that the current environment is likely to prevent the residual oil from completely dissolving and being discharged. In this case, the preset second working time is extended, and the extension can be set according to the actual temperature difference to ensure that sufficient heating time is available to completely dissolve and discharge the residual oil even in low-temperature environments. When the real-time ambient temperature is greater than the preset ambient temperature, the original preset second working time remains unchanged.

[0071] By dynamically adjusting the delayed shutdown time in conjunction with real-time ambient temperature, the heating effect on residual oil can be enhanced in frigid environments to ensure the dissolution and discharge of residual oil. At the same time, unnecessary heating extension can be avoided when the temperature is relatively suitable, further optimizing energy consumption and making the oil discharge control more in line with actual environmental conditions, thereby improving the adaptability and reliability of the equipment in different climatic scenarios.

[0072] In a preferred embodiment, the system further includes: controlling the oil fume purifier to shut down when the real-time liquid level information is greater than or equal to a preset high liquid level threshold. The preset high liquid level threshold is the highest critical liquid level to ensure the safe operation of the equipment, and its set height is 90% of the height of the oil collection tank 4, used to deal with emergency situations of abnormal oil accumulation. This threshold was determined through experimental verification to ensure that if operation continues when the oil reaches this height, it may cause the oil to overflow from the oil collection tank 4, seep into the equipment circuit, or enter the electrostatic purification module, causing safety accidents such as short circuits and fires.

[0073] When the real-time liquid level information is greater than or equal to the preset high liquid level threshold, the entire oil fume purifier is shut down, and an audible and visual alarm is activated to alert staff to promptly address the excessive oil buildup. This feature allows for rapid shutdown when the equipment faces a high-risk operating condition, preventing equipment damage or safety accidents caused by oil spills at the source. It further enhances the equipment's safety protection level and complements conventional liquid level control logic, constructing a multi-layered safety assurance system.

[0074] See Figure 2-5The present invention also provides an oil discharge structure for an oil fume purifier, wherein the oil discharge structure is controlled by the oil discharge control method of the oil fume purifier. The oil discharge structure includes a housing 1, a steam inlet pipe 2, and a steam outlet pipe 3. The bottom of the housing 1 is provided with oil collection tanks 4 arranged in parallel along the direction of flue gas flow. The oil collection tanks 4 are used to collect oil sludge generated by the oil fume purifier. The oil collection tanks 4 are provided with a liquid level sensor 5 and a first temperature sensor 6. The liquid level sensor 5 is used to detect the real-time liquid level of the oil sludge in the oil collection tanks 4, and the first temperature sensor 6 is used to detect the real-time temperature of the oil sludge. Each oil collection tank 4 is provided with a steam heating pipe 7. The steam in the steam inlet pipe 2 flows to the steam heating pipe 7 and is discharged through the steam outlet pipe 3. The steam inlet pipe 2 is provided with a steam switch valve 21 and a second temperature sensor 22. The second temperature sensor 22 is used to detect the real-time temperature of the incoming steam. The bottom of each oil collection tank 4 is connected to an oil discharge pipe 8.

[0075] During operation, the oil sludge falls into the oil collection tank 4 below due to its own weight. The oil easily freezes in the oil collection tank 4 and cannot be discharged in time, thus gradually accumulating. When the oil accumulates to a preset height, i.e., when the liquid level sensor 5 detects that the oil level has reached the preset working liquid level threshold, the steam switch valve 21 opens. Steam flows through the steam inlet pipe 2 into each steam heating pipe 7, and then exits through the steam outlet pipe 3. The steam exchanges heat with the steam heating pipes 7, thus heating and dissolving the oil. In this process, the steam exchanges heat with the steam heating pipes 7 to heat and dissolve the frozen oil. Simultaneously, the temperature of the frozen oil is detected by the first temperature sensor 6, and the temperature of the incoming steam is detected by the second temperature sensor 22. These two sensors work together to adjust the opening of the steam switch valve 21, thereby allowing an appropriate amount of steam to enter the steam heating pipes 7 for heating. This achieves efficient dissolution of the oil while reducing unnecessary energy consumption.

[0076] In the above description, the first temperature sensor 6 is installed in the oil collection tank 4 and is positioned close to the steam heating pipe 7. Since the steam heating pipe 7 is the component that directly heats the oil, its proximity reduces the lag in temperature detection, more accurately reflects the temperature state of the oil in the heating area, and provides a more timely basis for adjusting the opening of the steam switch valve 21.

[0077] Optionally, the first temperature sensor 6 is a thermocouple temperature sensor, which has oil-resistant and temperature-resistant characteristics. The probe can be directly inserted into the oil stains, and the response speed is fast, which can adapt to the harsh environment in the oil collection tank 4.

[0078] Optionally, the second temperature sensor 22 is installed on the steam inlet pipe 2. It is an infrared temperature sensor, which indirectly obtains the real-time temperature of the steam by detecting the infrared radiation temperature on the surface of the steam inlet pipe 2. It does not need to be in direct contact with the high-temperature steam, thus avoiding damage to the sensor caused by steam pressure and high temperature. At the same time, it has high detection accuracy and can stably monitor the steam temperature in the range of 90-150℃, which meets the requirements for heating mode judgment.

[0079] As described above, the steam outlet pipe 3 can be connected to the boiler to realize waste heat recovery, and the condensate and waste gas after heat exchange can be sent back to the boiler for reuse, thereby improving energy cycle efficiency; if the site does not have the conditions for recovery, it can also be directly discharged into the atmosphere.

[0080] In the above, one or more liquid level sensors 5 can be used, and the specific configuration is as follows:

[0081] In one embodiment, when using a single liquid level sensor 5, a capacitive liquid level sensor 5 is selected. This sensor continuously identifies multiple liquid level heights by detecting changes in capacitance between the oil and the sensor's probe, and can simultaneously determine whether the current liquid level has reached a preset working liquid level threshold, a low liquid level threshold, and a high liquid level threshold. This method eliminates the need to install multiple components at different heights in the oil collection tank 4, saving installation space and ensuring continuous detection.

[0082] In another embodiment, when multiple liquid level sensors 5 are used, photoelectric liquid level sensors are selected. Each sensor is installed at a height position corresponding to a preset threshold in the oil collection tank 4 (such as the working liquid level, low liquid level, and high liquid level). The liquid level is detected by infrared emission and reception: when the oil level rises to a certain sensor position, the oil blocks the infrared light, and the sensor immediately reports that the current liquid level has reached the corresponding threshold. This method provides a direct response and accurate detection, facilitating rapid triggering of the corresponding control logic.

[0083] In a preferred embodiment, see [reference] Figure 5The steam heating pipe 7 includes a first straight section 71, a second straight section 72, and a bent section 73 connecting the first straight section 71 and the second straight section 72. The first straight section 71 and the second straight section 72 are parallel. This structure extends the flow path of steam in the oil collecting tank 4, increases the heat exchange time between the steam and the steam heating pipe 7, and makes the heating effect more durable and stable. Several spaced first heat-conducting plates 74 are welded to the upper surface of the first straight section 71, and several spaced second heat-conducting plates 75 are welded to the upper surface of the second straight section 72. The multiple first heat-conducting plates 74 and second heat-conducting plates 75 are staggered to avoid concentrated heat accumulation. At the same time, the first heat-conducting plates 74 and second heat-conducting plates 75 both extend upward, increasing the contact area between the steam heating pipe 7 and the frozen oil, which can more evenly transfer the steam heat to the surrounding oil and greatly enhance the heat exchange efficiency. By combining dual temperature sensors to dynamically adjust the steam opening, it can accurately match the heating demand, avoiding the problems of local overheating or insufficient heating in traditional heating methods. It can also adjust the operating parameters in real time according to the ambient temperature and the freezing state of the oil, ensuring efficient defrosting of oil while minimizing ineffective steam consumption, thus achieving dual optimization of heating efficiency and energy saving goals.

[0084] The connection method between the steam inlet pipe 2 and each steam heating pipe 7 is as follows:

[0085] First, see Figure 3 Multiple steam heating pipes 7 within the oil collection tanks 4 are connected in parallel, meaning the steam inlet pipe 2 is connected to the inlet of each steam heating pipe 7, and the outlet of each steam heating pipe 7 is connected to the steam outlet pipe 3, thus forming an independent circuit for the steam heating pipes 7. A liquid level sensor 5 and a first temperature sensor 6 are located in the oil collection tank 4 near the flue gas inlet. Since the flue gas inlet is the area where oil fumes first come into contact, the oil settles quickly, and the initial accumulation is the largest. Installing sensors here allows for immediate detection of changes in oil level and temperature, enabling timely activation of the heating process.

[0086] Secondly, see Figure 4The steam heating pipes 7 in the multiple oil collection tanks 4 are connected in series. The steam inlet pipe 2 first connects to the inlet of the steam heating pipe 7 in the first oil collection tank 4, and the outlet of this steam heating pipe 7 is connected to the inlet of the steam heating pipe 7 in the next oil collection tank 4 via a connecting pipe 23, and so on, until the outlet of the last steam heating pipe 7 is connected to the steam outlet pipe 3. Steam flows sequentially through each heating pipe along the series path, releasing heat step by step and making full use of it. A liquid level sensor 5 is located in the oil collection tank 4 near the flue gas inlet end, allowing for the earliest detection of initial oil accumulation and timely initiation of the heating process. A first temperature sensor 6 is located in the oil collection tank 4 near the flue gas outlet end. Since the steam temperature decreases as it flows through the final steam heating pipe 7 with the release of heat, detecting the oil temperature at this location provides a more accurate reflection of the heating uniformity of the entire series system, especially ensuring that the oil in the downstream oil collection tank 4 is fully heated and dissolved, thereby guaranteeing the overall oil drainage effect.

[0087] In a preferred embodiment, see [reference] Figure 5 The oil collecting tank 4 has an inverted T-shaped cross-section, which can fully collect falling oil. An inclined plate 41 is provided at the bottom of the oil collecting tank 4, and the oil drain pipe 8 is located at the inclined end of the inclined plate 41. Specifically, the inclined angle of the inclined plate 41 is set to 3°-5°, guiding the oil to flow to a lower level by gravity. The oil drain pipe 8 is located at the lowest point of the entire oil collecting tank 4, ensuring that the oil dissolved by heating is completely drained into the oil drain pipe 8 through the inclined plate 41, minimizing residue.

[0088] Preferably, each oil collection tank 4 is equipped with a photoelectric liquid level sensor. This sensor detects when the oil level in each tank reaches a preset high liquid level threshold, enabling independent high liquid level monitoring for each tank and preventing overflow risks caused by undetected abnormal oil accumulation in a single tank. When the photoelectric liquid level sensor 5 of a tank 4 detects that the oil level has reached the high liquid level threshold, the entire fume purifier is shut down, and an audible and visual alarm is activated to alert staff to handle the situation promptly.

[0089] The present invention also provides an oil fume purifier, including the oil discharge structure of the oil fume purifier. Through temperature and liquid level control and efficient steam heating, it can effectively solve the problem of oil freezing and blockage in low-temperature environments, while significantly reducing energy consumption and extending the service life of the equipment. It is suitable for oil fume purification needs in various scenarios.

[0090] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A method for controlling oil discharge in an oil fume purifier, characterized in that, include: Acquire real-time liquid level information. When the real-time liquid level information is greater than or equal to the preset working liquid level threshold, control the steam switch valve to open at the preset initial opening degree for a duration of the preset first working duration. Obtain the real-time temperature of the oil stains and the real-time temperature of the introduced steam; Adjust the actual operating opening of the steam switch valve based on the real-time temperature of the oil and steam. A preset temperature rise threshold for oil sludge is set. When the rate of temperature rise of the oil sludge is less than the preset temperature rise threshold, the operating opening of the steam switch valve is increased. When the rate of temperature rise of the oil sludge is greater than the preset temperature rise threshold, the current operating opening of the steam switch valve is maintained. When the real-time liquid level information is less than or equal to the preset low liquid level threshold, the control steam switch valve is closed after a preset second working time.

2. The oil discharge control method of the oil fume purifier according to claim 1, characterized in that, The adjustment of the actual operating opening of the steam switch valve based on the real-time temperature of the oil and the real-time temperature of the steam specifically includes: Based on the real-time steam temperature, the heating mode is determined, including a low-temperature heating mode, a medium-temperature heating mode, and a high-temperature heating mode. When the real-time temperature of the oil stain is ≤5℃ and the real-time temperature of the steam is in low-temperature heating mode, the preset first working opening of the steam switch valve is obtained. When the real-time temperature of the oil sludge is ≤5℃ and the real-time temperature of the steam is in the medium-temperature heating mode, the preset second working opening of the steam switch valve is obtained. When the real-time temperature of the oil stain is ≤5℃ and the real-time temperature of the steam is in high-temperature heating mode, the preset third working opening of the steam switch valve is obtained. When 5℃ < real-time oil temperature ≤ 15℃, and the real-time steam temperature is in low-temperature heating mode, obtain the preset fourth working opening degree of the steam switch valve; When 5℃ < real-time oil temperature ≤ 15℃, and the real-time steam temperature is in medium-temperature heating mode, obtain the preset fifth working opening of the steam switch valve; When 5℃ < real-time oil temperature ≤ 15℃, and the real-time steam temperature is in high-temperature heating mode, obtain the preset sixth working opening of the steam switch valve; When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in low-temperature heating mode, obtain the preset seventh working opening of the steam switch valve; When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in medium-temperature heating mode, obtain the preset eighth working opening of the steam switch valve; When 15℃ < real-time oil temperature ≤ 22℃, and the real-time steam temperature is in high-temperature heating mode, obtain the preset ninth working opening degree of the steam switch valve.

3. The oil discharge control method of the oil fume purifier according to claim 1, characterized in that, The control of the steam switch valve to close after a preset second working time further includes: acquiring the real-time ambient temperature, and extending the preset second working time when the real-time ambient temperature is less than or equal to the preset ambient temperature.

4. The oil discharge control method of the oil fume purifier according to claim 1, characterized in that, Also includes: When the real-time liquid level information is greater than or equal to the preset high liquid level threshold, the oil fume purifier will be shut down.

5. An oil fume purifier's oil discharge structure, characterized in that, The oil discharge structure employs the oil discharge control method of the fume purifier as described in any one of claims 1-4 to achieve operational control; the oil discharge structure includes a casing, a steam inlet pipe, and a steam outlet pipe; the bottom of the casing is provided with oil collection troughs arranged in parallel along the flue gas flow direction; the oil collection troughs are used to collect the oil sludge generated by the fume purifier; the oil collection troughs are equipped with a liquid level sensor and a first temperature sensor, the liquid level sensor is used to detect the real-time liquid level of the oil sludge in the oil collection trough, and the first temperature sensor is used to detect the real-time temperature of the oil sludge; each of the oil collection troughs is equipped with a steam heating pipe, the steam in the steam inlet pipe flows to the steam heating pipe, and is discharged through the steam outlet pipe; the steam inlet pipe is equipped with a steam switch valve and a second temperature sensor; the second temperature sensor is used to detect the real-time temperature of the introduced steam; the bottom of each of the oil collection troughs is connected to an oil discharge pipe.

6. The oil discharge structure of the oil fume purifier according to claim 5, characterized in that, The steam heating pipe includes a first straight section, a second straight section, and a bent section connecting the first straight section and the second straight section, and the first straight section is parallel to the second straight section; a number of first heat-conducting plates are welded to the upper surface of the first straight section at intervals, and a number of second heat-conducting plates are welded to the upper surface of the second straight section at intervals, with the multiple first heat-conducting plates and second heat-conducting plates staggered.

7. The oil discharge structure of the oil fume purifier according to claim 5, characterized in that, The steam heating pipes in the multiple oil collection tanks are connected in parallel, and the liquid level sensor and the first temperature sensor are located in the oil collection tank near the flue gas inlet.

8. The oil discharge structure of the oil fume purifier according to claim 5, characterized in that, The steam heating pipes in the multiple oil collection tanks are connected in series, the liquid level sensor is located in the oil collection tank near the flue gas inlet, and the first temperature sensor is located in the oil collection tank near the flue gas outlet.

9. The oil discharge structure of the oil fume purifier according to claim 5, characterized in that, The oil collecting trough has an inverted T-shaped cross-section, and an inclined plate is provided at the bottom of the oil collecting trough. The oil drain pipe is located at the inclined end of the inclined plate.

10. An oil fume purifier, characterized in that, It includes the oil discharge structure of the fume purifier as described in claim 5.

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