Dichlorohydrin recovery method and system, intelligent terminal and storage medium

Abstract

The invention relates to a dichloropropanol recovery method and system, an intelligent terminal and a storage medium, and relates to the technical field of dichloropropanol recovery, and the method comprises the following steps: conveying a dichloropropanol waste liquid into a recovery kettle; the dichloropropanol waste liquid is conveyed into the reboiler through a circulating pump; distilling the dichloropropanol waste liquid through a reboiler to obtain dichloropropanol steam; detecting the liquid level variation in the recovery kettle; under the condition that the liquid level variable quantity is larger than a preset variable quantity threshold value, the step of distilling the dichloropropanol waste liquid through a reboiler is executed, and dichloropropanol steam is obtained; under the condition that the liquid level variable quantity is smaller than a preset variable quantity threshold value, steam is introduced into the recovery kettle for steam stripping operation, and dichloropropanol steam is obtained; the dichloropropanol steam is conveyed into a cooler; obtaining dichloropropanol liquid through a cooler; and conveying the dichloropropanol liquid into a recovery tank for storage. The method has the effect of reducing waste of dichloropropanol in the dichloropropanol waste liquid.

Description

Technical Field

[0001] The present application relates to the technical field of dichloropropanol recovery, and in particular to a method, system, intelligent terminal and storage medium for dichloropropanol recovery. Background Art

[0002] Dichloropropanol is an important organic intermediate. In the pharmaceutical field, it is an important raw material for synthesizing ganciclovir, can be used as an intermediate for synthesizing famotidine, and is one of the raw materials for synthesizing fluconazole. In the chemical industry, dichloropropanol is a key intermediate for producing epichlorohydrin, can be used to manufacture cross-linking agents for some polymer materials, and can improve the strength, heat resistance, corrosion resistance and other properties of the materials, and is widely used in industries such as rubber and plastics. Dichloropropanol is used in the production process of certain water treatment agents, which helps to improve the purification effect and stability of the water treatment agent on water quality. In addition, dichloropropanol has important applications in the fields of surfactants, dye intermediates and metal surface treatment.

[0003] In the existing process, when the dichloropropanol column bottom distills dichloropropanol, there is a part of dichloropropanol waste liquid in the column bottom. After being separated by a separation tank, the dichloropropanol waste liquid at the bottom of the column bottom is directly sent to an incinerator for incineration treatment. Among them, the dichloropropanol waste liquid contains about 15% of dichloropropanol.

[0004] Regarding the above related technologies, the inventor believes that directly incinerating the dichloropropanol waste liquid is likely to cause waste of the intermediate dichloropropanol and affect the output. Summary of the Invention

[0005] In order to reduce the waste of dichloropropanol in the dichloropropanol waste liquid, the present application provides a method, system, intelligent terminal and storage medium for dichloropropanol recovery.

[0006] In a first aspect, the present application provides a method for recovering dichloropropanol, adopting the following technical solution: A method for recovering dichloropropanol, the method comprising: Transporting the dichloropropanol waste liquid to a recovery kettle; Transporting the dichloropropanol waste liquid in the recovery kettle to a reboiler through a circulation pump; Distilling the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor; Detecting the change amount of the liquid level inside the recovery kettle; When the change amount of the liquid level is greater than the preset change amount threshold, perform the step of distilling the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor; when the change amount of the liquid level is less than the preset change amount threshold, stop performing the step of distilling the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor; perform a stripping operation by introducing steam into the recovery kettle to obtain the dichloropropanol vapor; Transport the dichloropropanol vapor to a cooler; Reduce the temperature of the dichloropropanol vapor through the cooler to obtain dichloropropanol liquid; Transport the dichloropropanol liquid in the cooler to a recovery tank for storage.

[0007] By adopting the above technical solution, the dichloropropanol waste liquid is transported to a recovery kettle, and then the dichloropropanol waste liquid in the recovery kettle is pumped into a reboiler by a circulation pump for distillation to obtain dichloropropanol vapor. When the reboiler distills the dichloropropanol waste liquid and the distillation effect is not obvious, that is, when the change amount of the liquid level in the recovery kettle is less than the change amount threshold, steam is introduced into the recovery kettle, so that the steam directly contacts the dichloropropanol waste liquid, thereby stripping the dichloropropanol in the dichloropropanol waste liquid to obtain dichloropropanol vapor. The cooler can cool the dichloropropanol vapor to obtain dichloropropanol liquid, and then transport the dichloropropanol liquid to a recovery tank for storage. The recovery of dichloropropanol in the dichloropropanol waste liquid is realized, thereby reducing the waste of dichloropropanol.

[0008] Optionally, monitor the flow data of the circulation pump; If the flow data is less than the flow threshold, control the circulation pump to work in the reverse direction; After the duration of the reverse operation of the circulation pump reaches the preset duration, control the circulation pump to work in the forward direction; Calculate the flow change rate of the flow data; If the flow change rate is less than the flow change threshold, close the first valve and open the second valve, and introduce steam toward the second valve to perform an impurity removal operation; If the flow change rate is not less than the flow change threshold, open the first valve and open the second valve, and control the circulation pump to work in the forward direction.

[0009] By adopting the above technical solution, when it is monitored that the flow data through the circulation pump is lower than the flow threshold, there may be a situation of impurity blockage in the conveying pipeline connecting the recovery kettle and the circulation pump. By controlling the reverse pump to work in the reverse direction, part of the dichloropropanol is conveyed reversely towards the recovery kettle, and the impurities are washed off from the side of the second valve close to the recovery kettle. Then, the circulation pump is controlled to work in the forward direction again, and the flow change rate of the flow data is calculated. If the flow change rate is less than the flow change threshold, it indicates that the side of the second valve close to the circulation pump is blocked. By introducing steam into the second valve, the impurities are washed off from the second valve. If the flow change rate is not less than the flow change threshold, it indicates that the impurities are blocked on the side of the second valve close to the recovery kettle and the impurities are washed off, thereby controlling the circulation pump to work in the forward direction. So that the circulation pump can continuously pump the dichloropropanol waste liquid into the reboiler for distillation.

[0010] Optionally, continuously monitor the flow data through the circulation pump; Judge whether the flow data is less than the flow threshold; If so, close the second valve and open the first valve, and remove impurities by introducing steam into the recovery kettle.

[0011] By adopting the above technical solution, by continuously monitoring the flow data through the circulation pump, judging whether the flow data is less than the flow threshold. If so, it indicates that there may be a situation of impurity blockage at the first valve. By introducing steam in the direction of the recovery kettle, the impurities at the first valve are washed off, so that the circulation pump can continuously pump the dichloropropanol waste liquid into the reboiler for distillation.

[0012] Optionally, detect the amount of waste liquid in the recovery kettle; Judge whether the amount of waste liquid in the recovery kettle is less than the lower limit threshold of the waste liquid amount; If so, control the pressure of the steam introduced into the recovery kettle to control the splashing of impurities; If not, then judge whether the amount of waste liquid in the recovery kettle is greater than the upper limit threshold of the waste liquid amount; If so, introduce steam in a random direction into the recovery kettle; If not, then introduce steam in a specified direction into the recovery kettle to make the waste liquid in the recovery kettle form a vortex.

[0013] By adopting the above technical solution, when the distillation effect of the dichloropropanol waste liquid by the reboiler is not obvious, and before introducing steam into the recovery kettle, first detect the amount of waste liquid in the recovery kettle. When the amount of waste liquid is less than the lower limit threshold of the waste liquid amount, it is necessary to control the pressure of the steam introduced into the recovery kettle to control the splashing of impurities. When the amount of waste liquid is greater than the upper limit threshold of the waste liquid amount, only introduce steam in a random direction into the recovery kettle to strip the dichloropropanol waste liquid, so as to obtain dichloropropanol steam. When the amount of waste liquid is greater than the lower limit threshold of the waste liquid amount and less than the upper limit threshold of the waste liquid amount, it is necessary to introduce steam in a specified direction into the recovery kettle to drive the dichloropropanol waste liquid to form a vortex, so as to wash the inner wall of the recovery kettle while stripping the dichloropropanol waste liquid, thereby reducing the probability of impurities remaining on the inner wall of the recovery kettle.

[0014] Optionally, during the process of introducing steam in a random direction into the recovery kettle, detect the temperature and flow rate of several detection points in the recovery kettle to obtain the temperature data and flow rate data of several detection points; If the temperature data of a target detection point is less than the temperature threshold and the flow rate data is less than the flow rate threshold, then obtain the position information of the target detection point; Determine the ventilation direction according to the position information; Introduce steam into the recovery kettle according to the ventilation direction.

[0015] By adopting the above technical solution, by detecting the temperature data and flow rate data of several points, if there is a target detection point whose temperature data is less than the temperature threshold and the flow rate data is less than the flow rate threshold, it indicates that the stripping effect of the steam in a random direction on the target detection point is not good. Therefore, it is necessary to determine the position information of the target detection point, and then adjust the direction of the steam and ventilate according to the position information of the target detection point, so as to heat the target detection point to improve the stripping efficiency of the dichloropropanol waste liquid.

[0016] Optionally, extract the historical temperature data of several detection points from the historical records; Form a scatter plot according to the historical temperature data and fit the scatter plot to obtain a curve graph; Calculate the average value of the historical temperature data; If the average value is less than the preset temperature average value, then take the current time as the standard, intercept a time period, and calculate the ratio of the historical temperature data in the time period to the time period to obtain the curve slope in the time period; Judge whether the curve slope is less than the preset slope; If so, introduce steam in the direction of the detection point for stripping operation.

[0017] By adopting the above technical solution, historical temperature data of several detection points is extracted from the historical records, a curve graph is obtained from the historical temperature data, and then the average value of the historical temperature data is calculated. If the average value is lower than the preset temperature average value, it indicates that the temperature at the detection point is insufficient. Then, taking the current time as the standard, the curve slope within a time period is obtained. If the curve slope is lower than the preset slope, it indicates that the temperature rise at the detection point is slow. Therefore, steam needs to be introduced in the direction of the detection point to increase the temperature at the detection point and improve the stripping efficiency of the detection point.

[0018] Optionally, according to the flow rate data of each of the detection points, the flow rate data is mapped to a direction horizontally perpendicular to the diameter of the recovery kettle to obtain tangential flow rate data; Extract the tangential flow rate data located at the same height to form a set of tangential flow rate data; Perform a classification operation on the set of tangential flow rate data to obtain a first set of tangential flow rate data and a second set of tangential flow rate data. The tangential flow rate data in the first set of tangential flow rate data is in the clockwise direction, and the tangential flow rate data in the second set of tangential flow rate data is in the counterclockwise direction; Perform a weighted calculation on the first set of tangential flow rate data to obtain a first flow rate data; perform a weighted calculation on the second set of tangential flow rate data to obtain a second flow rate data; Compare the magnitudes of the first flow rate data and the second flow rate data; If the first flow rate data is greater than the second flow rate data, introduce steam in the clockwise direction into the recovery kettle; If the first flow rate data is not greater than the second flow rate data, introduce steam in the counterclockwise direction into the recovery kettle.

[0019] By adopting the above technical solution, by mapping the flow rate data to a direction horizontally perpendicular to the diameter of the recovery kettle, tangential flow rate data is obtained. Then, the tangential flow rate data at the same height is aggregated to obtain a set of tangential flow rate data. Then, first flow rate data and second flow rate data are obtained based on the set of tangential flow rate data. If the first flow rate data is greater than the second flow rate data, it indicates that the dichloropropanol waste liquid in the recovery kettle rotates in the clockwise direction. At this time, introduce steam in the clockwise direction into the recovery kettle to enable the steam to fully contact the dichloropropanol waste liquid and improve the stripping efficiency of dichloropropanol; if the first flow rate data is less than the second flow rate data, it indicates that the dichloropropanol waste liquid in the recovery kettle rotates in the counterclockwise direction. At this time, introduce steam in the counterclockwise direction into the recovery kettle to enable the steam to fully contact the dichloropropanol waste liquid and improve the stripping efficiency of dichloropropanol.

[0020] In a second aspect, the present application provides a dichloropropanol recovery system, adopting the following technical solution: A dichloropropanol recovery system, comprising an acquisition module for acquiring liquid level change amount, waste liquid amount, flow rate data, temperature data, flow velocity data, position information, and historical records; A memory for storing a program of the dichloropropanol recovery method; A processor, and the program in the memory can be loaded and executed by the processor to implement the dichloropropanol recovery method.

[0021] By adopting the above technical solution, the dichloropropanol waste liquid is transported to a recovery kettle, and then the dichloropropanol waste liquid in the recovery kettle is pumped into a reboiler by a circulation pump for distillation to obtain dichloropropanol vapor. When the reboiler distills the dichloropropanol waste liquid and the distillation effect is not obvious, that is, when the liquid level change amount in the recovery kettle is less than the change amount threshold, steam is introduced into the recovery kettle, so that the steam directly contacts the dichloropropanol waste liquid, thereby stripping the dichloropropanol in the dichloropropanol waste liquid to obtain dichloropropanol vapor. The cooler can cool the dichloropropanol vapor to obtain dichloropropanol liquid, and then the dichloropropanol liquid is transported to a recovery tank for storage. The recovery of dichloropropanol in the dichloropropanol waste liquid is realized, thereby reducing the waste of dichloropropanol.

[0022] In a third aspect, the present application provides an intelligent terminal, adopting the following technical solution: An intelligent terminal, comprising a memory and a processor, and a computer program capable of being loaded and executed by the processor is stored on the memory and implements any one of the above methods.

[0023] In a fourth aspect, the present application provides a computer storage medium, which can store a corresponding program and has the characteristic of being convenient to realize reducing the waste of dichloropropanol in the dichloropropanol waste liquid, adopting the following technical solution: A computer-readable storage medium stores a computer program capable of being loaded and executed by the processor to implement any one of the above dichloropropanol recovery methods.

[0024] By adopting the above technical solution, the dichloropropanol waste liquid is transported to a recovery kettle, and then the dichloropropanol waste liquid in the recovery kettle is pumped into a reboiler by a circulation pump for distillation to obtain dichloropropanol vapor. When the reboiler distills the dichloropropanol waste liquid and the distillation effect is not obvious, that is, when the liquid level change amount in the recovery kettle is less than the change amount threshold, steam is introduced into the recovery kettle, so that the steam directly contacts the dichloropropanol waste liquid, thereby stripping the dichloropropanol in the dichloropropanol waste liquid to obtain dichloropropanol vapor. The cooler can cool the dichloropropanol vapor to obtain dichloropropanol liquid, and then the dichloropropanol liquid is transported to a recovery tank for storage. The recovery of dichloropropanol in the dichloropropanol waste liquid is realized, thereby reducing the waste of dichloropropanol.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The dichloropropanol waste liquid is transported to the recovery kettle, and then the dichloropropanol waste liquid in the recovery kettle is pumped into the reboiler by a circulation pump for distillation to obtain dichloropropanol vapor. When the reboiler distills the dichloropropanol waste liquid and the distillation effect is not obvious, that is, when the liquid level change amount in the recovery kettle is less than the change amount threshold, steam is introduced into the recovery kettle, so that the steam directly contacts the dichloropropanol waste liquid, thereby stripping the dichloropropanol in the dichloropropanol waste liquid to obtain dichloropropanol vapor. The cooler can cool the dichloropropanol vapor to obtain dichloropropanol liquid, and then the dichloropropanol liquid is transported to the recovery tank for storage. The recovery of dichloropropanol in the dichloropropanol waste liquid is realized, thereby reducing the waste of dichloropropanol; 2. When it is monitored that the flow data through the circulation pump is lower than the flow threshold, there may be a situation of impurity blockage in the pipeline connecting the recovery kettle and the circulation pump. By controlling the reverse pump to work in the reverse direction, part of the dichloropropanol is transported reversely towards the recovery kettle, and the impurities are washed off from the side of the second valve close to the recovery kettle. Then, the circulation pump is controlled to work in the forward direction again, and the flow change rate of the flow data is calculated. If the flow change rate is less than the flow change threshold, it means that the side of the second valve close to the circulation pump is blocked. By introducing steam into the second valve, the impurities are washed off from the second valve. If the flow change rate is not less than the flow change threshold, it means that the impurities are blocked on the side of the second valve close to the recovery kettle and the impurities are washed off, so the circulation pump is controlled to work in the forward direction. The circulation pump can continuously pump the dichloropropanol waste liquid into the reboiler for distillation; 3. By detecting the temperature data and flow data of several points, if the temperature data of the target detection point is less than the temperature threshold and the flow velocity data is less than the flow velocity threshold, it indicates that the stripping effect of the steam in the random direction on the target detection point is not good. Therefore, it is necessary to determine the position information of the target detection point, and then by adjusting the direction of the steam and ventilating according to the position information of the target detection point, the target detection point is heated to improve the stripping efficiency of the dichloropropanol waste liquid. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of a dichloropropanol recovery device provided by an embodiment of the present application.

[0027] Figure 2 is a schematic flow chart of a dichloropropanol recovery method provided by an embodiment of the present application.

[0028] Figure 3 is a schematic flow chart of a method for reducing the blockage probability of the second valve provided by an embodiment of the present application.

[0029] Figure 4It is a schematic flow chart of a method for reducing the clogging probability of the first valve provided by an embodiment of the present application.

[0030] Figure 5 It is a schematic flow chart of a method for preventing impurities from remaining on the inner wall of the recovery kettle provided by an embodiment of the present application.

[0031] Figure 6 It is a schematic flow chart of a stripping method provided by an embodiment of the present application.

[0032] Figure 7 It is a schematic flow chart of a method for determining the stripping direction provided by an embodiment of the present application.

[0033] Figure 8 It is a schematic flow chart of a method for increasing the contact area of water vapor provided by an embodiment of the present application.

[0034] Explanation of reference numerals: 1. Recovery kettle; 11. Feed pipeline; 12. Delivery pipeline; 121. First valve; 122. Second valve; 13. Steam pipeline; 14. Steam delivery pipeline; 2. Reboiler; 3. Cooler; 4. Recovery tank; 5. Circulation pump. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying Figure 1-8 drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] An embodiment of the present application discloses a dichloropropanol recovery device. Referring to Figure 1 , the dichloropropanol recovery device includes: a recovery kettle 1, a reboiler 2, a cooler 3 and a recovery tank 4; a feed pipeline 11 that is communicated with the inside and is used for feeding dichloropropanol waste liquid is arranged on the side wall at the top of the recovery kettle 1.

[0037] A delivery pipeline 12 for communication is arranged between the recovery kettle 1 and the reboiler 2, and a circulation pump 5 is arranged on the delivery pipeline 12. The circulation pump 5 is used to pump the dichloropropanol waste liquid in the recovery kettle into the reboiler 3.

[0038] A steam pipeline 13 is also communicated with the delivery pipeline 12, and steam is introduced into the recovery kettle 1 through the steam 13 pipeline.

[0039] The top of the reboiler 2 is communicated with the side wall at the top of the recovery kettle 1 through a steam outlet pipeline 21; the top of the recovery kettle 1 is communicated with the top of the cooler 3 through a steam delivery pipeline 14; the bottom of the cooler 3 is communicated with the top of the recovery tank 4 through a liquid delivery pipeline 31.

[0040] An embodiment of the present application discloses a dichloropropanol recovery method. Referring toFigure 2 , the dichloropropanol recovery method includes: Step S201: Transport the dichloropropanol waste liquid to a recovery kettle.

[0041] The dichloropropanol waste liquid refers to the waste liquid containing dichloropropanol generated during industrial production. After distilling dichloropropanol in the dichloropropanol column kettle, a part of the dichloropropanol waste liquid remains in the column kettle, and this part of the dichloropropanol waste liquid usually contains 15% of dichloropropanol.

[0042] The recovery kettle is a container for storing and treating waste liquid, usually having corrosion resistance and high temperature resistance.

[0043] The dichloropropanol waste liquid is transported to the recovery kettle through a feed pipeline.

[0044] Step S202: Transport the dichloropropanol waste liquid in the recovery kettle to a reboiler through a circulating pump.

[0045] The circulating pump is a mechanical device for transporting liquids. The circulating pump can transport liquids forward and also backward.

[0046] The reboiler is a device that can distill liquids. The reboiler usually has a shell side and a tube side. Liquid is introduced into the tube side, and high-pressure steam is introduced into the shell side. The high-pressure steam can exchange heat with the liquid in the tube side, thereby realizing the distillation of the liquid in the tube side.

[0047] The circulating pump pumps out the dichloropropanol waste liquid in the recovery kettle from the transport pipeline at the bottom of the recovery kettle and pumps the dichloropropanol waste liquid into the reboiler through the transport pipeline.

[0048] Step S203: Distill the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor.

[0049] Transport the dichloropropanol waste liquid along the transport pipeline to the tube side of the reboiler. Introduce high-pressure steam into the shell side of the reboiler. The steam contacts the outer wall of the tube side, realizing heat exchange between the steam and the dichloropropanol waste liquid in the tube side, distilling the dichloropropanol waste liquid, and thus generating dichloropropanol vapor.

[0050] Step S204: Detect the change amount of the liquid level inside the recovery kettle.

[0051] The change amount of the liquid level is the change value of the volume of the dichloropropanol waste liquid in the recovery kettle within a certain period of time. For example, the change value of the dichloropropanol waste liquid volume within 30 seconds. The reboiler distills the dichloropropanol waste liquid, reducing the content of dichloropropanol in the dichloropropanol waste liquid and decreasing the volume of the dichloropropanol waste liquid. Therefore, the value of the change amount of the liquid level can reflect the reduction value of the concentration of dichloropropanol in the dichloropropanol waste liquid.

[0052] Optionally, a liquid level gauge is provided on the recovery still, and the change in the liquid level height of the dichloropropanol waste liquid is detected through the liquid level gauge to obtain the change amount of the liquid level of the dichloropropanol waste liquid.

[0053] Step S205: When the change amount of the liquid level is greater than a preset change amount threshold, perform the step of distilling the dichloropropanol waste liquid through a reboiler to obtain dichloropropanol vapor.

[0054] The preset change amount threshold is a preset constant, and the specific value of the preset change amount threshold can be adjusted according to actual needs. For example, the preset change amount threshold can be set to 2% of the height of the recovery still.

[0055] If the change amount of the liquid level is greater than the preset change amount threshold, it means that the reboiler is performing normal distillation work on the dichloropropanol waste liquid, and continue to execute step S203.

[0056] Step S206: When the change amount of the liquid level is less than the preset change amount threshold, stop performing the step of distilling the dichloropropanol waste liquid through a reboiler to obtain dichloropropanol vapor.

[0057] If the change amount of the liquid level is less than the preset change amount threshold, it means that the concentration of dichloropropanol in the dichloropropanol waste liquid is low. At this time, the distillation effect of the reboiler on the dichloropropanol waste liquid is not ideal, and stop step S203.

[0058] Step S207: Perform a stripping operation by introducing steam into the recovery still to obtain dichloropropanol vapor.

[0059] Stripping refers to the process of heating a mixture with steam to make the mixture into two different phases of vapor phase and liquid phase of separated substances, and then separating the vapor phase part from the liquid phase.

[0060] By introducing steam into the recovery still, the steam directly contacts the dichloropropanol waste liquid to heat the dichloropropanol, and the dichloropropanol in the dichloropropanol waste liquid is separated in the form of vapor phase to obtain dichloropropanol vapor. Even if the concentration of dichloropropanol in the dichloropropanol waste liquid is low, the dichloropropanol can be extracted by the stripping method.

[0061] Step S208: Transport the dichloropropanol vapor to a cooler.

[0062] The dichloropropanol vapor is transported to the recovery still through the steam outlet pipe, and then transported to the cooler through the steam transmission pipe. Among them, part of the dichloropropanol vapor is liquefied when it meets cold in the steam outlet pipe and returns to the recovery still.

[0063] Step S209: Lower the temperature of the dichloropropanol vapor through a cooler to obtain dichloropropanol liquid.

[0064] Inside the cooler, there is a channel for transporting dichloropropanol vapor, and flowing water passes through the outer wall of this channel to transfer the heat of the dichloropropanol vapor to the water. Since the water is flowing, it can continuously carry away the heat of the dichloropropanol vapor, causing the dichloropropanol vapor to cool and liquefy to obtain dichloropropanol liquid.

[0065] Step S210: Transport the dichloropropanol liquid in the cooler to a recovery tank for storage.

[0066] The recovery tank is a tank for storing liquids.

[0067] Transport the dichloropropanol liquid to the recovery tank through an infusion pipeline.

[0068] Optionally, one end of the infusion pipeline is connected to the bottom of the cooler and the other end is connected to the top of the recovery tank. The recovery tank is arranged below the cooler so that the dichloropropanol liquid can flow by gravity into the recovery tank.

[0069] By adopting the above technical solution, the dichloropropanol waste liquid is transported to a recovery kettle, and then the dichloropropanol waste liquid in the recovery kettle is pumped into a reboiler by a circulating pump for distillation to obtain dichloropropanol vapor. When the reboiler distills the dichloropropanol waste liquid and the distillation effect is not obvious, that is, when the change amount of the liquid level in the recovery kettle is less than the change amount threshold, steam is introduced into the recovery kettle so that the steam directly contacts the dichloropropanol waste liquid, thereby stripping the dichloropropanol in the dichloropropanol waste liquid to obtain dichloropropanol vapor. The cooler can cool the dichloropropanol vapor to obtain dichloropropanol liquid, and then transport the dichloropropanol liquid to the recovery tank for storage. The recovery of dichloropropanol in the dichloropropanol waste liquid is realized, thereby reducing the waste of dichloropropanol.

[0070] In the following embodiments, please refer to Figure 1 , between the recovery kettle 1 and the reboiler 2 is connected by a transport pipeline 12. A first valve 121 and a second valve 122 are arranged on the transport pipeline 12. The first valve 121 is close to the recovery kettle 1, the second valve 122 is located between the first valve 121 and the circulating pump 5, and the steam outlet of the steam is located between the first valve 121 and the second valve 122. The second valve 122 may be blocked, resulting in a reduction in the flow rate through the circulating pump 5, reducing the distillation effect on the dichloropropanol waste liquid. To solve this problem, the embodiments of the present application disclose a method for reducing the probability of blockage of the second valve. Refer to Figure 3 This method includes: Step S301: Monitor the flow rate data passing through the circulating pump.

[0071] The flow rate data is the volume of the dichloropropanol waste liquid passing through the circulating pump within a certain period of time. For example, the flow rate data is the volume of the dichloropropanol waste liquid passing through the circulating pump within 30 seconds.

[0072] Flow meters are provided at both the inlet end and the outlet end of the circulation pump, and the volume of the dichloropropanol waste liquid passing through the circulation pump is measured by the flow meters. Optionally, the flow meter can be a differential pressure flow meter, a rotameter, a throttling flow meter, a volumetric flow meter, an electromagnetic flow meter, or an ultrasonic flow meter. In this embodiment, the flow meter is preferably an ultrasonic flow meter.

[0073] Step S302: If the flow data is less than the flow threshold, control the circulation pump to operate in the reverse direction.

[0074] In another aspect, if the flow data is not less than the flow threshold, it is not necessary to control the circulation pump to operate in the reverse direction.

[0075] The flow threshold is a preset constant, and the flow threshold is related to the flow data. The value of the flow threshold can be adjusted according to actual needs.

[0076] If the flow data is less than the flow threshold, it indicates that the first valve or the second valve is blocked. Control the circulation pump to operate in the reverse direction so that the dichloropropanol waste liquid is transported towards the recovery kettle, and the impurities on the side of the second valve away from the circulation pump are washed off.

[0077] Step S303: After the reverse operation duration of the circulation pump reaches the preset duration, control the circulation pump to operate in the forward direction.

[0078] The preset duration is a preset constant and can be adjusted according to actual needs. For example, the preset duration can be set to 3 seconds.

[0079] When the reverse operation duration of the circulation pump reaches the preset duration, at this time the first valve or the second valve may have been unclogged, so it is necessary to control the circulation pump to operate in the forward direction to pump the dichloropropanol waste liquid to the reboiler for distillation.

[0080] Step S304: Calculate the flow rate change rate of the flow data.

[0081] The flow rate change rate refers to the rate of change of the flow data with time.

[0082] Exemplarily, before the circulation pump operates in the reverse direction, the flow data Q1 is recorded by the flow meter. When the reverse operation duration of the circulation pump reaches the preset duration and switches to the forward direction, the flow data Q2 is recorded by the flow meter. The flow rate change rate is Q2 - Q1.

[0083] Step S305: If the flow rate change rate is less than the flow rate change threshold, close the first valve and open the second valve, and pass steam towards the second valve to perform the impurity removal operation.

[0084] The flow rate change threshold is a preset constant and can be adjusted according to the actual situation.

[0085] If the flow rate change rate is less than the flow rate change threshold, it indicates that there is still a blockage in the first valve or the second valve, and the blockage position of the second valve is on the side facing the circulation pump. Then close the first valve and open the second valve. Since the steam outlet is between the first valve and the second valve, and the steam is high-pressure steam, the steam can be transported along the pipeline towards the second valve. If there is an impurity blocked on the side of the second valve close to the circulation pump, the impurity can be removed.

[0086] Step S306: If the flow rate change rate is not less than the flow rate change threshold, open the first valve and the second valve, and control the circulation pump to operate forward.

[0087] If the flow rate change rate is not less than the flow rate change threshold, it indicates that the flow rate change rate is positive, that is, the flow rate data Q2 > the flow rate data Q1. At this time, the second valve has been unblocked. Open the first valve and the second valve, and control the circulation pump to operate forward to transport the dichloropropanol waste liquid to the reboiler.

[0088] By adopting the above technical solution, when it is monitored that the flow rate data passing through the circulation pump is lower than the flow rate threshold, there may be a blockage of impurities in the pipeline connecting the recovery kettle and the circulation pump. By controlling the reverse pump to operate in reverse, part of the dichloropropanol is transported reversely towards the recovery kettle, and the impurities are washed off from the side of the second valve close to the recovery kettle. Then, control the circulation pump to operate forward again, calculate the flow rate change rate of the flow rate data. If the flow rate change rate is less than the flow rate change threshold, it means that the side of the second valve close to the circulation pump is blocked. By introducing steam towards the second valve, the impurities are washed off from the second valve. If the flow rate change rate is not less than the flow rate change threshold, it means that the impurities are blocked on the side of the second valve close to the recovery kettle and the impurities have been washed off, so as to control the circulation pump to operate forward. So that the circulation pump can continuously pump the dichloropropanol waste liquid into the reboiler for distillation.

[0089] In the following embodiments, the first valve may be blocked, resulting in a reduction in the flow rate passing through the circulation pump and a decrease in the distillation effect of the dichloropropanol waste liquid. To solve this problem, the embodiment of the present application discloses a method for reducing the blockage probability of the first valve. Refer to Figure 4 , this method includes: Step S401: Continuously monitor the flow rate data passing through the circulation pump.

[0090] After performing step S305, continuously monitor the flow rate data passing through the circulation pump.

[0091] Step S402: Determine whether the flow rate data is less than the flow rate threshold.

[0092] The flow rate threshold is a preset constant and is the same as the flow rate threshold in step S302.

[0093] By comparing the flow rate data Q3 after performing step S305 with the flow rate threshold, if the flow rate data Q3 is less than the flow rate threshold, it indicates that there may be a blockage at the first valve.

[0094] Step S403: If so, close the second valve and open the first valve, and introduce steam into the recovery kettle to remove impurities.

[0095] On the other hand, if the flow rate data is not less than the flow rate threshold, end the process of this embodiment.

[0096] If so, that is, the flow rate data Q3 is less than the flow rate threshold, it indicates that there may be a blockage at the first valve. By closing the second valve and opening the first valve, steam is transported towards the recovery kettle, and the impurities at the first valve are washed off to dredge the first valve.

[0097] By adopting the above technical solution, by continuously monitoring the flow rate data of the circulation pump and judging whether the flow rate data is less than the flow rate threshold, if so, it indicates that there may be impurity blockage at the first valve. By introducing steam towards the recovery kettle, the impurities at the first valve are washed off, so that the circulation pump can continuously pump the dichloropropanol waste liquid to the reboiler for distillation.

[0098] In the following embodiment, some impurities may be attached during the transfer of the dichloropropanol waste liquid, and this part of the impurities will be transported to the recovery kettle together with the dichloropropanol waste liquid. During the process of introducing steam into the recovery kettle for stripping operation, this part of the impurities may splash and remain on the inner wall of the recovery kettle. To solve this problem, the embodiment of the present application discloses a method for preventing impurities from remaining on the inner wall of the recovery kettle. Refer to Figure 5 , this method includes: Step S501: Detect the amount of waste liquid in the recovery kettle.

[0099] The amount of waste liquid is the volume of dichloropropanol waste liquid in the recovery kettle.

[0100] The value of the liquid level in the recovery kettle can be obtained through a liquid level gauge.

[0101] Step S502: Judge whether the amount of waste liquid in the recovery kettle is less than the lower limit threshold of the amount of waste liquid.

[0102] The lower limit threshold of the amount of waste liquid is a preset constant, and the value of the lower limit threshold of the amount of waste liquid can be set according to process requirements. Compare the amount of waste liquid in the recovery kettle obtained through the liquid level gauge with the lower limit threshold of the amount of waste liquid, and judge whether the amount of waste liquid is less than the lower limit threshold of the amount of waste liquid.

[0103] Step S503: If so, control the pressure of the steam introduced into the recovery kettle to control the splashing of impurities.

[0104] If the amount of waste liquid is less than the lower limit threshold of the waste liquid amount. At this time, the amount of dichloropropanol waste liquid in the recovery kettle is small. When steam is introduced into the recovery kettle, if the pressure of the steam is high, the dichloropropanol waste liquid in the recovery kettle will splash, resulting in impurities being easily retained on the inner wall of the recovery kettle. Therefore, it is necessary to reduce the pressure of the steam introduced into the recovery kettle so that the dichloropropanol waste liquid is not easily splashed and the impurities are not easily retained on the inner wall of the recovery kettle.

[0105] Step S504: If not, then determine whether the amount of waste liquid in the recovery kettle is greater than the upper limit threshold of the waste liquid amount.

[0106] The upper limit threshold of the waste liquid amount is a preset constant, and the value of the upper limit threshold of the waste liquid amount can be set according to process requirements.

[0107] If the amount of waste liquid is not less than the lower limit threshold of the waste liquid amount, it is necessary to compare the amount of waste liquid with the upper limit threshold of the waste liquid amount and determine whether the amount of waste liquid is greater than the upper limit threshold of the waste liquid amount.

[0108] Step S505: If so, introduce steam in a random direction into the recovery kettle.

[0109] The dichloropropanol in the dichloropropanol waste liquid can escape from the dichloropropanol waste liquid together with the steam.

[0110] Optionally, a steam head for introducing steam is provided at the bottom of the recovery kettle, and the steam head can change the direction of steam introduction according to actual needs.

[0111] If the amount of waste liquid is greater than the upper limit threshold of the waste liquid amount, it means that the amount of dichloropropanol waste liquid in the recovery kettle is large. When steam is introduced into the recovery kettle, the probability of splashing of the dichloropropanol waste liquid is low, that is, the probability of impurities remaining on the inner wall of the recovery kettle is low. At this time, when introducing steam into the recovery kettle, there is no need to consider the direction of steam introduction.

[0112] Step S506: If not, then introduce steam in a specified direction into the recovery kettle to form a vortex of the waste liquid in the recovery kettle.

[0113] If the amount of waste liquid is less than the upper limit threshold of the waste liquid amount and greater than the lower limit threshold of the waste liquid amount, during the process of introducing steam into the recovery kettle, the probability of splashing of the dichloropropanol waste liquid is high. Therefore, it is necessary to control the direction of steam introduction to reduce the probability of splashing of the dichloropropanol waste liquid.

[0114] Exemplarily, change the orientation of the steam head so that the projection of the orientation of the steam head in the horizontal direction is consistent with the tangential direction of the inner wall of the recovery kettle, and introduce steam in the clockwise direction. Among them, the angle between the projection of the orientation of the steam head in the vertical direction and the horizontal direction is 45°. When the steam is introduced into the recovery kettle through the steam head, it can drive the dichloropropanol waste liquid to rotate to form a vortex. While the dichloropropanol waste liquid is rotating, it can also wash away the impurities remaining on the inner wall of the recovery kettle.

[0115] By adopting the above technical solution, when the distillation effect of the dichloropropanol waste liquid by the reboiler is not obvious, and before introducing steam into the recovery kettle, first detect the amount of waste liquid in the recovery kettle. When the amount of waste liquid is less than the lower limit threshold of the waste liquid amount, it is necessary to control the pressure of the steam introduced into the recovery kettle to control the splashing of impurities. When the amount of waste liquid is greater than the upper limit threshold of the waste liquid amount, only introduce steam into the recovery kettle in a random direction to strip the dichloropropanol waste liquid to obtain dichloropropanol steam. When the amount of waste liquid is greater than the lower limit threshold of the waste liquid amount and less than the upper limit threshold of the waste liquid amount, it is necessary to introduce steam into the recovery kettle in a specified direction to drive the dichloropropanol waste liquid to form a vortex, and while stripping the dichloropropanol waste liquid, it can wash the inner wall of the recovery kettle, thereby reducing the probability of impurities remaining on the inner wall of the recovery kettle. In the following embodiments, during the process of stripping the dichloropropanol waste liquid by introducing steam into the recovery kettle, there may be areas where the steam cannot effectively contact the dichloropropanol waste liquid, resulting in a reduction in the stripping efficiency of the dichloropropanol waste liquid. To solve this problem, the embodiments of the present application disclose a stripping method. Refer to Figure 6 , this method includes: Step S601: During the process of introducing steam into the recovery kettle in a random direction, detect the temperature and flow rate of several detection points in the recovery kettle to obtain the temperature data and flow rate data of several detection points.

[0116] A temperature sensor and a flow rate sensor are arranged at the detection point. The temperature data of the detection point can be obtained through the temperature sensor, and the flow rate data of the detection point can be obtained through the flow rate sensor.

[0117] Step S602: If there is a situation where the temperature data of the target detection point is less than the temperature threshold and the flow rate data is less than the flow rate threshold, obtain the position information of the target detection point.

[0118] On the other hand, if there is no situation where the temperature data of the target detection point is less than the temperature threshold and the flow rate data is less than the flow rate threshold, end the process of this embodiment.

[0119] Both the temperature threshold and the flow rate threshold are preset constants, and both are related to the stripping requirement of the dichloropropanol waste liquid, and the temperature threshold and the flow rate threshold can be adjusted according to actual needs.

[0120] If there is a target detection point whose temperature data is less than the temperature threshold and the flow rate data is less than the flow rate threshold, it means that when the water vapor enters the recovery kettle, the water vapor cannot effectively strip the dichloropropanol waste liquid at the target detection point. At this time, the position information of the target detection point needs to be obtained.

[0121] Step S603: Determine the ventilation direction according to the position information.

[0122] The water vapor is introduced into the recovery kettle through the steam head, that is, the ventilation direction is the same as the orientation direction of the steam head in step S505. By changing the orientation of the steam head, the steam head is made to face the direction provided by the position information.

[0123] Step S604: Introduce water vapor into the recovery kettle according to the ventilation direction.

[0124] By introducing water vapor towards the target detection point, the water vapor can effectively contact the dichloropropanol liquid at the target detection point, thereby improving the stripping efficiency of the dichloropropanol waste liquid.

[0125] By adopting the above technical solution, by detecting the temperature data and flow rate data of several points, if there is a target detection point whose temperature data is less than the temperature threshold and the flow rate data is less than the flow rate threshold, it indicates that the stripping effect of the water vapor in the random direction on the target detection point is not good. Therefore, it is necessary to determine the position information of the target detection point, and then by adjusting the direction of the water vapor and ventilating according to the position information of the target detection point, the target detection point can be heated to improve the stripping efficiency of the dichloropropanol waste liquid.

[0126] In the following embodiments, when obtaining the temperature data and flow rate data of the detection point, during the process of introducing water vapor into the recovery kettle, the dichloropropanol waste liquid at the detection point is not fixed, so there may be errors in measuring the temperature. To solve this problem, the embodiments of the present application disclose a method for determining the stripping direction. Refer to Figure 7 , the method includes: Step S701: Extract the historical temperature data of several detection points from the historical record.

[0127] The historical record refers to the historical data stored in the system in the past period of time. The historical data includes historical temperature data and historical flow rate data, and is usually saved in the form of a time series.

[0128] In this embodiment, the historical temperature data can also be replaced by the historical flow rate data.

[0129] During the process of introducing water vapor into the recovery kettle, extract the historical temperature data of several detection points from the historical record. Exemplarily, extract the historical temperature data of 7 detection points.

[0130] Step S702: Form a scatter plot based on historical temperature data and fit the scatter plot to obtain a curve graph.

[0131] The historical temperature data is in discrete form and cannot reflect the continuous temperature change at the detection point. Therefore, it is necessary to fit and predict the aforementioned continuous temperature change to improve the accuracy of subsequent calculation steps.

[0132] A scatter plot refers to plotting historical temperature data in the form of points in a coordinate system, with the horizontal axis being time and the vertical axis being the historical temperature data. Fitting means finding a curve through mathematical methods to make it as close as possible to the data points in the scatter plot. A curve graph refers to a smooth curve obtained through fitting, which is used to describe the changing trend of historical temperature data over time.

[0133] Step S703: Calculate the average value of the historical temperature data.

[0134] The average value is the average of the historical temperature data at the detection point over a past period of time.

[0135] Step S704: If the average value is less than the preset average temperature, then taking the current time as the standard, intercept a time period and calculate the ratio of the historical temperature data within the time period to the time period to obtain the curve slope within the time period.

[0136] On the other hand, if the average value is not less than the average temperature, it means that the temperature at the detection point is normal, so the process of this embodiment is ended.

[0137] The preset average temperature is a preset constant and can be adjusted according to actual needs.

[0138] If the average value is less than the preset average temperature, it means that the temperature at the detection point corresponding to this average value is relatively low compared to the preset average temperature over a past period of time, making the stripping effect of steam on this detection point not ideal. Taking the current time as the standard, intercept a time period and calculate the ratio of the historical temperature data within this time period to this time period to obtain the curve slope within the time period, which can obtain the change rate of the historical temperature data at this detection point through the curve slope.

[0139] Step S705: Determine whether the curve slope is less than the preset slope.

[0140] The preset slope is a preset constant, and the preset slope is related to the temperature change rate of the dichloropropanol waste liquid.

[0141] Step S706: If so, introduce steam in the direction towards the detection point to perform a stripping operation.

[0142] On the other hand, if the curve slope is not less than the preset slope, there is no need to change the direction of steam introduction.

[0143] If the slope of the curve is less than the preset slope, that is, the change rate of the historical temperature data is lower than the preset slope, it indicates that the temperature rising speed at the detection point is low. Therefore, it is necessary to direct the steam head towards the detection point and introduce steam towards the detection point for stripping operation.

[0144] By adopting the above technical solution, historical temperature data of several detection points are extracted from the historical record, a curve graph is obtained through the historical temperature data, and then the average value of the historical temperature data is calculated. If the average value is lower than the preset temperature average value, it indicates that the temperature at this detection point is insufficient. Then, taking the current time as the standard, the slope of the curve within a time period is obtained. If the curve slope is lower than the preset slope, it indicates that the temperature rise at this detection point is slow. Therefore, it is also necessary to introduce steam towards the detection point to increase the temperature at this detection point and improve the stripping efficiency of this detection point.

[0145] In the following embodiments, there are regions where the dichloropropanol waste liquid rotates in different directions, making it impossible for the steam to come into full contact with the dichloropropanol waste liquid. To solve this problem, the embodiments of the present application disclose a method for increasing the contact area of steam. Refer to Figure 8 , the method includes: Step S801: According to the flow rate data of each detection point, map the flow rate data to the direction perpendicular to the diameter of the recovery kettle horizontally to obtain the tangential flow rate data.

[0146] The tangential flow rate data refers to the component of the flow rate data in the direction perpendicular to the diameter of the recovery kettle horizontally.

[0147] According to the component of the flow rate data in the direction perpendicular to the diameter of the recovery kettle horizontally, it can be judged whether the dichloropropanol waste liquid is in a vortex state and the rotation rate can be determined.

[0148] Step S802: Extract the tangential flow rate data located at the same height to form a set of tangential flow rate data.

[0149] The set of tangential flow rate data is a set of tangential flow rate data of several detection points at the same height of the dichloropropanol waste liquid. Exemplarily, 7 detection points are selected at the same height of the dichloropropanol waste liquid, and the tangential flow rate data of these 7 detection points are extracted to obtain the set of tangential flow rate data {A, B, C, D, E, F, G}. Among them, the tangential flow rate data in the clockwise direction is positive, and the tangential flow rate data in the counterclockwise direction is negative.

[0150] Step S803: Perform a classification operation on the set of tangential flow rate data to obtain a first set of tangential flow rate data and a second set of tangential flow rate data. The tangential flow rate data in the first set of tangential flow rate data is in the clockwise direction, and the tangential flow rate data in the second set of tangential flow rate data is in the counterclockwise direction.

[0151] The first set of tangential flow velocity data is the set of data where the tangential flow velocity data is positive. Among them, the tangential flow velocity data being positive indicates that the direction of the tangential flow velocity data is clockwise.

[0152] The second set of tangential flow velocity data is the set of data where the tangential flow velocity data is negative. Among them, the tangential flow velocity data being negative indicates that the direction of the tangential flow velocity data is counterclockwise.

[0153] Exemplarily, among the set of tangential flow velocity data {A, B, C, D, E, F, G}, A, C, E, and F are all positive values, and B, D, and G are negative values. Then the first set of tangential flow velocity data is {A, C, E, F}, and the second set of tangential flow velocity data is {B, D, G}.

[0154] Step S804: Perform weighted calculation on the first set of tangential flow rate data to obtain the first flow velocity data. Perform weighted calculation on the second set of tangential flow velocity data to obtain the second flow velocity data.

[0155] Weighted calculation means assigning different weights according to the importance or contribution degree of each data point, and then calculating the weighted average. Among them, the weight is positively correlated with the distance of the detection point from the center position of the recovery kettle.

[0156] Exemplarily, the first set of tangential flow velocity data is {A, C, E, F}, and the weights are Wa, Wc, We, and Wf respectively. The first flow velocity data is: First flow velocity data = (Wa * A + Wc * C + We * E + Wf * F) / (Wa + Wc + We + Wf).

[0157] The first set of tangential flow velocity data is {B, D, G}, and the weights are Wb, Wd, and Wg respectively. The second flow velocity data is: Second flow velocity data = (Wb * B + Wd * D + Wg * G) / (Wb + Wd + Wg).

[0158] Step S805: Compare the magnitudes of the first flow velocity data and the second flow velocity data.

[0159] By comparing the magnitudes of the first flow velocity data and the second flow velocity data. If the first flow velocity data is greater than the second flow velocity data, then execute S806; if the first flow velocity data is not greater than the second flow velocity data, then execute S807.

[0160] Step S806: If the first flow velocity data is greater than the second flow velocity data, then introduce steam in the clockwise direction into the recovery kettle.

[0161] If the first flow velocity data is greater than the second flow velocity data, it indicates that the dichloropropanol waste liquid as a whole is rotating in the clockwise direction.

[0162] Change the orientation of the steam head so that the projection of the orientation of the steam head in the horizontal direction is in the clockwise direction. Then introduce steam to accelerate the rotation of the dichloropropanol waste liquid, enabling the steam to come into full contact with the dichloropropanol waste liquid and improving the stripping efficiency.

[0163] Step S807: If the first flow rate data is not greater than the second flow rate data, introduce steam in the counterclockwise direction into the recovery kettle.

[0164] If the first flow rate data is not greater than the second flow rate data, it indicates that the dichloropropanol waste liquid as a whole rotates in the counterclockwise direction.

[0165] Change the orientation of the steam head so that the projection of the orientation of the steam head in the horizontal direction is in the counterclockwise direction. Then introduce steam to accelerate the rotation of the dichloropropanol waste liquid, enabling the steam to come into full contact with the dichloropropanol waste liquid and improving the stripping efficiency.

[0166] By adopting the above technical solution, the flow rate data is mapped to the direction perpendicular to the diameter of the recovery kettle in the horizontal plane to obtain the tangential flow rate data. Then, the tangential flow rate data at the same height is aggregated to obtain the tangential flow rate data set. Then, the first flow rate data and the second flow rate data are obtained according to the tangential flow rate data set. If the first flow rate data is greater than the second flow rate data, it indicates that the dichloropropanol waste liquid in the recovery kettle rotates in the clockwise direction. At this time, introduce steam in the clockwise direction into the recovery kettle so that the steam can come into full contact with the dichloropropanol waste liquid and improve the stripping efficiency of dichloropropanol; if the first flow rate data is less than the second flow rate data, it indicates that the dichloropropanol waste liquid in the recovery kettle rotates in the counterclockwise direction. At this time, introduce steam in the counterclockwise direction into the recovery kettle so that the steam can come into full contact with the dichloropropanol waste liquid and improve the stripping efficiency of dichloropropanol.

[0167] Based on the same inventive concept, an embodiment of the present application provides a dichloropropanol recovery system, including: An acquisition module for acquiring the liquid level change amount, waste liquid amount, flow rate data, temperature data, flow velocity data, position information, and historical record; A memory for storing the program of the dichloropropanol recovery method; A processor, and the program in the memory can be loaded and executed by the processor to implement the dichloropropanol recovery method.

[0168] By adopting the above technical solution, the dichloropropanol waste liquid is transported to a recovery kettle, and then the dichloropropanol waste liquid in the recovery kettle is pumped into a reboiler by a circulation pump for distillation to obtain dichloropropanol vapor. When the reboiler distills the dichloropropanol waste liquid and the distillation effect is not obvious, that is, when the liquid level change amount in the recovery kettle is less than the change amount threshold, steam is introduced into the recovery kettle, so that the steam directly contacts the dichloropropanol waste liquid, thereby stripping the dichloropropanol in the dichloropropanol waste liquid to obtain dichloropropanol vapor. The cooler can cool the dichloropropanol vapor to obtain dichloropropanol liquid, and then the dichloropropanol liquid is transported to a recovery tank for storage. The recovery of dichloropropanol in the dichloropropanol waste liquid is realized, thereby reducing the waste of dichloropropanol.

[0169] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0170] The embodiment of the present application provides a computer-readable storage medium storing a computer program that can be loaded and executed by a processor for the dichloropropanol recovery method.

[0171] Computer storage media include, for example, various media that can store program codes such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0172] Based on the same inventive concept, the embodiment of the present application provides an intelligent terminal including a memory and a processor, and a computer program that can be loaded and executed by the processor for the dichloropropanol recovery method is stored on the memory.

[0173] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0174] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Any feature disclosed in this specification (including the abstract and drawings), unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example of a series of equivalent or similar features.

Claims

1. A method for recovering dichloropropanol, characterized in that: The method comprises: The dichloropropanol waste liquid is transported to a recovery kettle; The dichloropropanol waste liquid in the recovery kettle is transported to the reboiler through a circulation pump; Distilling the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor; Detecting the change in the liquid level inside the recovery kettle; When the liquid level change is greater than a preset change threshold, the step of distilling the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor is performed; when the liquid level change is less than the preset change threshold, the step of distilling the dichloropropanol waste liquid through the reboiler to obtain dichloropropanol vapor is stopped; and the dichloropropanol vapor is obtained by introducing water vapor into the recovery kettle to perform a stripping operation; conveying the dichloropropanol vapor to a cooler; The temperature of the dichloropropane vapor is reduced by the cooler to obtain dichloropropane liquid; The dichloropropane liquid in the cooler is transported to a recovery tank for storage.

2. A method for recovering dichloropropanol according to claim 1, characterized in that: The recovery kettle and the reboiler are connected via a delivery pipeline, a first valve and a second valve are provided on the delivery pipeline, the first valve is close to the recovery kettle, the second valve is located between the first valve and the circulation pump, and the steam outlet is located between the first valve and the second valve; The method further comprises: Monitoring flow data through the circulation pump; If the flow data is less than the flow threshold, control the circulation pump to work in reverse; After the duration of the reverse operation of the circulating pump reaches a preset duration, controlling the circulating pump to operate in the forward direction; Calculating the flow rate change rate of the flow data; If the flow rate change rate is less than the flow rate change threshold, closing the first valve and opening the second valve, and passing water vapor toward the second valve to perform an impurity removal operation; If the flow rate change rate is not less than the flow rate change threshold, the first valve and the second valve are opened, and the circulation pump is controlled to work in the forward direction.

3. A method for recovering dichloropropanol according to claim 2, characterized in that: After the water vapor is introduced toward the second valve, the method further comprises: Continuously monitoring the flow data through the circulation pump; Determining whether the flow data is less than the flow threshold; If so, close the second valve and open the first valve, and introduce water vapor into the recovery kettle to remove impurities.

4. A method for recovering dichloropropanol according to claim 1, characterized in that: The method further comprises: Detecting the amount of waste liquid in the recovery kettle; Determining whether the amount of waste liquid in the recovery kettle is less than a lower limit threshold of the amount of waste liquid; If so, the splashing of impurities is controlled by controlling the pressure of the water vapor introduced into the recovery kettle; If not, determining whether the amount of waste liquid in the recovery kettle is greater than an upper threshold value of the amount of waste liquid; If yes, then by introducing water vapor in random directions into the recovery kettle; If not, water vapor is introduced into the recovery kettle in a specified direction so that the waste liquid in the recovery kettle forms a vortex.

5. A method for recovering dichloropropanol according to claim 4, characterized in that: The method further comprises: In the process of introducing water vapor in a random direction into the recovery kettle, the temperature and flow rate of several detection points in the recovery kettle are detected to obtain temperature data and flow rate data of the several detection points; If there is a target detection point where the temperature data is less than the temperature threshold and the flow rate data is less than the flow rate threshold, acquiring the position information of the target detection point; determining a ventilation direction according to the position information; According to the ventilation direction, water vapor is introduced into the recovery kettle.

6. A method for recovering dichloropropanol according to claim 5, characterized in that: The method further comprises: Extracting historical temperature data of several detection points from historical records; Forming a discrete graph according to the historical temperature data, and fitting the discrete graph to obtain a curve graph; Calculating an average value of the historical temperature data; If the average value is less than the preset temperature average value, a time period is intercepted based on the current time, and the ratio of the historical temperature data in the time period to the time period is calculated to obtain the slope of the curve in the time period; Determining whether the slope of the curve is less than a preset slope; If so, water vapor is introduced toward the detection point to perform a stripping operation.

7. A method for recovering dichloropropanol according to claim 5, characterized in that: The method further comprises: According to the flow velocity data of each detection point, the flow velocity data is mapped to a direction horizontally perpendicular to the diameter of the recovery kettle to obtain tangent flow velocity data; Extracting the tangent flow velocity data at the same height to form a tangent flow velocity data set; Performing a classification operation on the tangent flow velocity data set to obtain a first tangent flow velocity data set and a second tangent flow velocity data set, wherein the tangent flow velocity data in the first tangent flow velocity data set are along a clockwise direction, and the tangent flow velocity data in the second tangent flow velocity data set are along a counterclockwise direction; Performing weighted calculation on the first tangent flow data set to obtain first flow velocity data; performing weighted calculation on the second tangent flow velocity data set to obtain second flow velocity data; comparing the first flow velocity data and the second flow velocity data; If the first flow rate data is greater than the second flow rate data, water vapor is introduced into the recovery kettle in a clockwise direction; If the first flow rate data is not greater than the second flow rate data, water vapor is introduced into the recovery kettle in a counterclockwise direction.

8. A dichloropropanol recovery system, characterized in that: The system is used to perform a dichloropropane recovery method according to any one of claims 1 to 7, comprising: Acquisition module, used to obtain liquid level change, waste liquid volume, flow data, temperature data, flow rate data, location information, and historical records; A memory for storing a program of the dichloropropane recovery method; The program in the memory can be loaded and executed by the processor to implement the dichloropropane recovery method.

9. An intelligent terminal, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and executes the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: A computer program is stored which can be loaded by a processor and execute the method according to any one of claims 1 to 7.

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