Processing system and control method for movable tank body cleaning

Abstract

The embodiment of the invention provides a treatment system for movable tank cleaning and a control method. In the treatment system, first gas replacement equipment is used for discharging residual gas in a movable tank body; the tail gas condensing equipment is used for condensing the residual gas to obtain liquefied waste liquid and unliquefied waste gas; the condensate tank is used for further separating unliquefied waste gas and temporarily storing liquefied waste liquid; the non-electric gas conveying equipment is used for sucking residual gas and conveying waste gas to the factory air supplementing equipment; the factory air supplementing equipment is used for adjusting the flow of supplemented factory air according to the gas output flow of the non-electric gas conveying equipment so as to meet the preset waste gas treatment flow requirement; the wastewater tank is used for temporarily storing waste liquid and cleaning wastewater generated by cleaning the interior of the tank body through the tank body cleaning equipment; the wastewater discharge adjusting equipment is used for allowing the liquid in the wastewater tank to be discharged when a plurality of indexes of the liquid in the wastewater tank meet preset wastewater treatment index requirements.

Description

Technical Field

[0001] The embodiments of this specification relate to the field of chemical engineering and environmental protection technology, and in particular to a processing system and control method for mobile tank cleaning. Background Art

[0002] With the continuous development of the chemical industry, the demand for mobile tanks such as tank trucks and tank containers for transporting chemicals has also increased. According to regulations, the inside of mobile tanks needs to be cleaned when they are changed to transport different types or varieties of goods. The cleaning operation of mobile tanks is often accompanied by the discharge of organic wastewater and volatile organic waste gas. Therefore, how to safely and efficiently clean mobile tanks and minimize the discharge of corresponding wastewater and waste gas has become a problem that needs to be solved. Summary of the invention

[0003] In view of the above, the embodiments of this specification provide a processing system and control method for mobile tank cleaning. With this processing system, the residual gas inside the mobile tank can be discharged using a first gas replacement device, and then the inside of the mobile tank can be cleaned using a tank cleaning device. Next, the residual gas can be condensed using an exhaust gas condensation device to obtain liquefied waste liquid and unliquefied waste gas, and then the unliquefied waste gas can be further separated using a condensate tank and the liquefied waste liquid can be temporarily stored. Non-electric gas conveying equipment can also be used to suck the residual gas so that the residual gas passes through the exhaust gas condensation equipment and the condensate tank in turn, and the waste gas from the condensate tank is conveyed to the factory wind replenishment equipment; further, the factory wind replenishment equipment is based on The flow rate of the supplemented factory air is adjusted according to the gas output flow rate of the non-electric gas conveying equipment, so that the sum of the flow rate of the supplemented factory air and the gas output flow rate meets the preset waste gas treatment flow requirement; the waste water tank is then used to temporarily store the waste liquid from the condensate tank and the cleaning waste water generated by cleaning the inside of the mobile tank body, and the waste water discharge regulating equipment is used to allow the liquid in the waste water tank to be discharged when it is judged that several indicators of the liquid in the waste water tank meet the preset waste water treatment indicator requirements, so that the waste water and waste gas discharged by the treatment system for mobile tank cleaning meet certain conditions, which is helpful for subsequent further treatment.

[0004] According to one aspect of an embodiment of the present specification, a processing system for cleaning a mobile tank is provided, comprising: a first gas replacement device for discharging residual gas from the inside of the mobile tank; a tank cleaning device for cleaning the inside of the mobile tank; an exhaust gas condensing device for condensing the residual gas to obtain liquefied waste liquid and unliquefied waste gas; a condensate tank for further separating the unliquefied waste gas and temporarily storing the liquefied waste liquid; a non-electric gas conveying device for sucking the residual gas so that the residual gas passes through the exhaust gas condensing device and the condensate tank in sequence. and conveying the waste gas from the condensate tank to the factory air replenishment equipment; the factory air replenishment equipment is used to adjust the flow rate of the replenished factory air according to the gas output flow rate of the non-electric gas conveying equipment, so that the sum of the flow rate of the replenished factory air and the gas output flow rate meets the preset waste gas treatment flow rate requirement; a wastewater tank is used to temporarily store the waste liquid from the condensate tank and the cleaning waste water generated by cleaning the inside of the mobile tank body; and a wastewater discharge regulating device is used to allow the liquid in the wastewater tank to be discharged when several indicators of the liquid in the wastewater tank meet the preset wastewater treatment indicator requirements.

[0005] According to another aspect of the embodiments of the present specification, there is provided a control method for a processing system as described above, the control method being executed by a distributed control system and a programmable logic controller, the control method comprising: in response to determining that the mobile tank has completed electrostatic grounding, the programmable logic controller generating status information indicating that the mobile tank has completed electrostatic grounding; in response to receiving input on-site cleaning task information and the status information indicating that the mobile tank has completed electrostatic grounding, the programmable logic controller transmitting the on-site cleaning task information to the distributed control system; in response to receiving confirmation information indicating confirmation of the on-site cleaning task information, the distributed control system activating the tank cleaning program and sending an instruction to the programmable logic controller indicating that tank cleaning is allowed; in response to receiving on-site confirmation information indicating the start of cleaning and having received an instruction sent by the distributed control system indicating that tank cleaning is allowed, the programmable logic controller sending a first notification information to the distributed control system indicating that the cleaning site is ready; in response to receiving the first notification information, The distributed control system checks the status of the non-electric gas delivery equipment and the corresponding exhaust gas valve, and sends a second notification message indicating that the gas replacement conditions are ready to the programmable logic controller when the exhaust gas delivery passage meets the preset requirements; in response to receiving the second notification message, the programmable logic controller sends a corresponding gas replacement control instruction to the first gas replacement equipment according to the gas replacement method indicated by the on-site cleaning task information; in response to the air pressure inside the mobile tank body meeting the preset negative pressure requirement, the programmable logic controller sends a third notification message indicating that the manhole is allowed to be opened and the tank cleaning equipment is allowed to be placed inside the mobile tank body; in response to receiving an on-site operation instruction indicating the start of cleaning, the distributed control system checks the status of the wastewater tank and the wastewater discharge regulating equipment, and sends a fourth notification message indicating that the cleaning is allowed to be started to the programmable logic controller when the checked status meets the preset wastewater receiving status requirement; and in response to receiving the fourth notification message, the programmable logic controller sends a control instruction indicating the start of cleaning to the tank cleaning equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] A further understanding of the nature and advantages of the content of this specification may be achieved by referring to the following drawings. In the drawings, similar components or features may have the same reference numerals.

[0007] Figure 1 A schematic diagram showing an example of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0008] Figure 2A schematic diagram showing yet another example of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0009] Figure 3 A schematic diagram showing an example of a portion of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0010] Figure 4 A schematic diagram showing yet another example of a portion of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0011] Figure 5 A schematic diagram showing yet another example of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0012] Figure 6 A signaling diagram showing an example of an interaction process between a control device and other devices in a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0013] Figure 7 A schematic diagram showing another example of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0014] Figure 8 A schematic diagram showing yet another example of a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0015] Fig. 9 A flow chart showing an example of a control method applied to a processing system for mobile tank cleaning according to an embodiment of the present specification. DETAILED DESCRIPTION

[0016] The subject matter described herein will be discussed below with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and is not a limitation of the scope of protection, applicability or examples set forth in the claims. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the embodiments of this specification. Various processes or components may be omitted, substituted or added to each example as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0017] As used herein, the term "including" and its variations represent open terms, meaning "including but not limited to". The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other definitions may be included below, whether explicit or implicit. Unless the context clearly indicates otherwise, the definition of a term is consistent throughout the specification.

[0018] The flowcharts used in this specification illustrate the operations implemented by the system according to some embodiments in this specification. It should be clearly understood that the operations of the flowcharts may not be implemented in sequence. On the contrary, the operations may be implemented in reverse order or simultaneously. In addition, one or more other operations may be added to the flowchart. One or more operations may be removed from the flowchart.

[0019] In view of this, the embodiment of this specification proposes a treatment scheme for mobile tank cleaning. In this treatment scheme, a gas replacement device is used to provide good conditions for tank cleaning, and the residual gas discharged from the inside of the mobile tank is collected by the tail gas condensation device, and the discharged residual gas is further separated into gas and liquid by using the condensate tank, and then the residual gas is sucked by the non-electric gas conveying device and conveyed to the factory wind supplementary device. The factory wind supplementary device adjusts the flow rate of the supplemented factory wind according to the gas output flow rate of the non-electric gas conveying device, and then the wastewater tank and the wastewater discharge regulating device are set to ensure that the wastewater can only be discharged after several indicators meet the requirements, thereby providing a wastewater and waste gas joint pretreatment scheme for the mobile tank cleaning process, ensuring that the wastewater and waste gas transported to the downstream equipment meet the preset requirements, and providing a basis for further centralized treatment of wastewater and waste gas.

[0020] The processing system and control method for mobile tank cleaning according to the embodiments of this specification will be described in detail below with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram of an example of a processing system 100 for mobile tank cleaning according to an embodiment of the present specification is shown.

[0022] like Figure 1 As shown, the processing system 100 for mobile tank cleaning may include a first gas replacement device 110, a tank cleaning device 120, an exhaust gas condensation device 130, a condensate tank 140, a non-electric gas transmission device 150, a factory wind supplement device 160, a wastewater tank 170, and a wastewater discharge adjustment device 180. In some examples, the above-mentioned various parts of the processing system 100 for mobile tank cleaning can be connected by pipelines.

[0023] The first gas replacement device 110 can be used to discharge the residual gas inside the mobile tank. In some examples, the first gas replacement device 110 can use factory wind to input replacement gas (such as nitrogen) into the mobile tank (such as the tank box of a tank truck) to replace the exhaust gas (such as volatile organic waste gas) in the mobile tank. The replaced exhaust gas can be transported to the tail gas condensation device 130 through a pipeline. In some examples, after the replacement gas is filled (i.e., the boosting process), it can be maintained for a certain time and then released (i.e., the depressurization process). In some examples, the above-mentioned boost-depressurization process can be repeated a preset number of times (e.g., 2 to 3 times). In some examples, during the subsequent cleaning of the interior of the mobile tank, the above-mentioned gas replacement operation can also be continued to reduce the residue as much as possible.

[0024] The tank cleaning device 120 can be used to clean the inside of a mobile tank. In some examples, the tank cleaning device 120 may include a cleaning pump, a heating device, a detergent dispensing device, etc. In some examples, the tank cleaning device 120 can clean the inside of a mobile tank according to a certain procedure. For example, water washing, heated steam washing, detergent washing, and water washing can be performed in sequence. In some examples, the tank cleaning device 120 may further include various types of sensors, such as a sensor for detecting residues inside the tank, a sensor for detecting the viscosity of residues inside the tank, a liquid level sensor, etc. Thus, the tank cleaning device 120 can adjust the cleaning procedure accordingly according to the detection results of the corresponding sensors, such as increasing or decreasing several cleaning steps.

[0025] In some examples, the tank cleaning device 120 may further include a drying device. Generally, after the above-mentioned cleaning processes such as water cleaning, heating steam cleaning, detergent cleaning, and water cleaning are completed, the drying device may be used to dry the inner wall of the mobile tank.

[0026] The tail gas condensing device 130 can be used to condense the residual gas discharged from the inside of the mobile tank to obtain liquefied waste liquid and unliquefied waste gas. The tail gas condensing device 130 can be various devices that can be used to condense gas. After passing through the tail gas condensing device 130, a part of the waste gas becomes liquefied waste liquid; after passing through the tail gas condensing device 130, another part of the waste gas (such as gas with a higher boiling point) becomes unliquefied waste gas and is transported to the condensate tank 140 together.

[0027] The condensate tank 140 can be used to further separate the unliquefied waste gas and temporarily store the liquefied waste liquid. Thus, the heavy components in the waste gas can be temporarily stored in the condensate tank 140 in liquid form, while the lighter components can be further transported to its downstream equipment through pipelines in gas form.

[0028] The non-electric gas delivery device 150 can be used to extract the above-mentioned residual gas so that the residual gas passes through the tail gas condensation device 130 and the condensate tank 140 in sequence, and the exhaust gas from the condensate tank 140 is delivered to the factory wind supplement device 160. The non-electric gas delivery device 150 is relative to the gas delivery device (such as a blower, a compressor, etc.) that includes an electrically driven mechanical component (such as an impeller, a piston, etc.). In some examples, the non-electric gas delivery device 150 may include various devices that use gas dynamics principles to transport gas, such as a gas ejector (Jet pump). In some examples, the gas ejector can use high-pressure (such as 700-800kPa) factory wind as a high-speed airflow to drive the delivery of the above-mentioned residual gas. In some examples, the suction force of the above-mentioned residual gas can also be adjusted by controlling the degree of decompression of the above-mentioned high-pressure factory wind.

[0029] The factory wind supplement device 160 can be used to adjust the flow rate of the supplemented factory wind according to the gas output flow rate of the non-electric gas delivery device 150, so that the sum of the flow rate of the supplemented factory wind and the above-mentioned gas output flow rate meets the preset exhaust gas treatment flow rate requirement. In some examples, the preset exhaust gas treatment flow rate requirement may be that the flow rate fluctuation does not exceed a preset range, such as fluctuations within a range of ±5% of a given flow rate. The factory wind supplement device 160 can adjust the flow rate of the supplemented factory wind according to the gas output flow rate of the non-electric gas delivery device 150 so that the total gas flow rate transported to its downstream equipment (such as the exhaust gas treatment equipment) through the factory wind supplement device 160 meets the above-mentioned preset exhaust gas treatment flow rate requirement. In some examples, the exhaust gas treatment equipment may be an exhaust gas combustion system, so that the emission of exhaust gas can be minimized.

[0030] In some examples, the factory air supplement equipment 160 may include a flow control device. In some examples, the flow control device can directly adjust the flow of the supplemented factory air so that the sum of the flow of the supplemented factory air and the gas output flow of the non-electric gas conveying device 150 meets the preset exhaust gas treatment flow requirements (for example, maintaining stability at a constant flow value). In some examples, the flow control device may include but is not limited to at least one of the following: a flow valve (FlowValve, FV), a flow indicating controller (Flow Indicating Controller, FIC). Compared with the prior art that usually uses fans for exhaust gas transportation, the use of static equipment such as non-electric gas conveying equipment instead of dynamic equipment such as fans with rotating parts can avoid the generation of sparks causing explosions, which is particularly suitable for the transmission of flammable and explosive gases in mobile tank cleaning scenarios, significantly improving safety.

[0031] The wastewater tank 170 can be used to temporarily store waste liquid from the condensate tank 140 and cleaning waste water generated by cleaning the interior of the mobile tank. In some examples, the wastewater tank 170 often has a larger capacity than the condensate tank 140.

[0032] The wastewater discharge regulating device 180 can be used to allow the liquid in the wastewater tank 170 to be discharged when several indicators of the liquid in the wastewater tank 170 meet the preset wastewater treatment indicator requirements. In some examples, the preset wastewater treatment indicator requirements may include but are not limited to at least one of the following: the temperature does not exceed the preset temperature threshold, the degree of organic pollution in the water quality is lower than the preset threshold, etc. In some examples, the wastewater discharge regulating device 170 can control the liquid in the wastewater tank 160 to be transported to the wastewater treatment facility when several indicators of the liquid in the wastewater tank 170 meet the corresponding wastewater treatment indicator requirements. In some examples, the wastewater treatment facility can be a centralized wastewater treatment system. The wastewater discharge regulating device can ensure that the wastewater discharged into the centralized wastewater treatment system meets the corresponding indicator requirements, laying a good foundation for the subsequent centralized treatment of wastewater, thereby improving the treatment efficiency of the wastewater generated during the mobile tank cleaning process.

[0033] Reference below Figure 2 , Figure 2 A schematic diagram of yet another example of a processing system 200 for mobile tank cleaning according to an embodiment of the present specification is shown.

[0034] like Figure 2 As shown, the processing system 200 for mobile tank cleaning may include a first gas replacement device 210, a second gas replacement device 212, a tank cleaning device 220, a spray device 222, an exhaust gas condensation device 230, a condensate tank 240, a non-electric gas conveying device 250, a factory wind supplement device 260, a wastewater tank 270, a wastewater discharge regulating device 280, and a wastewater tank gas conveying device 290. In some examples, the above-mentioned various parts of the processing system 200 for mobile tank cleaning can be connected by pipelines.

[0035] In this embodiment, the first gas replacement equipment 210, the tank cleaning equipment 220, the exhaust gas condensation equipment 230, the condensate tank 240, the non-electric gas conveying equipment 250, the wastewater tank 270 and the wastewater discharge regulating equipment 280 can be consistent with the description of the first gas replacement equipment 110, the tank cleaning equipment 120, the exhaust gas condensation equipment 130, the condensate tank 140, the non-electric gas conveying equipment 150, the wastewater tank 170 and the wastewater discharge regulating equipment 180 in the aforementioned embodiment, and will not be repeated here.

[0036] The second gas replacement device 212 and the spray device 222 can be connected to the wastewater tank 270. The spray device 222 can be used to clean the inner wall of the wastewater tank 270. In some examples, the wastewater tank 260 can be cleaned by spraying the inner wall of the wastewater tank 270 with the spray device 222. The specific cleaning process can refer to the description of the tank cleaning device 120 cleaning the inside of the mobile tank, which will not be repeated here.

[0037] The second gas replacement device 212 can be used to discharge the gas inside the wastewater tank 270. In some examples, the replacement process of the gas inside the wastewater tank 270 by the second gas replacement device 212 can refer to the description of the first gas replacement device 110 discharging the residual gas inside the mobile tank body, which will not be repeated here. In some examples, the replacement gas (e.g., nitrogen) used by the second gas replacement device 212 and the first gas replacement device 210 can be drawn from the same gas supply pipeline. Similarly, in some examples, the water used by the tank cleaning device 220 and the spraying device 222 can be drawn from the same water supply pipeline.

[0038] The factory wind supplement device 260 can be further used to adjust the flow rate of the supplemented factory wind according to the gas output flow rate of the non-electric gas delivery device 250 and the flow rate of the gas discharged from the wastewater tank 270, so that the sum of the flow rate of the supplemented factory wind, the flow rate of the gas discharged from the wastewater tank 270 and the gas output flow rate of the non-electric gas delivery device 250 meets the preset exhaust gas treatment flow rate requirement. In some examples, the preset exhaust gas treatment flow rate requirement can be that the flow rate fluctuation does not exceed a preset range, such as fluctuating within a range of ±5% of a given flow rate. The factory wind supplement device 260 can adjust the flow rate of the supplemented factory wind according to the sum of the gas output flow rate of the non-electric gas delivery device 250 and the flow rate of the gas discharged from the wastewater tank 270, so that the total gas flow rate delivered to its downstream equipment (such as the exhaust gas treatment equipment) through the factory wind supplement device 260 meets the above-mentioned preset exhaust gas treatment flow rate requirement. In some examples, the exhaust gas treatment equipment can be an exhaust gas combustion system, so that the exhaust gas emission can be minimized.

[0039] The wastewater tank gas delivery device 290 can deliver the gas discharged from the wastewater tank 260 to the factory air supplement device 260. In some examples, the wastewater tank gas delivery device 290 can be a gas delivery pipeline system, which can include components such as pipelines, pipe fittings, and valves. The gas delivery pipeline system can achieve stable delivery of gas by reasonable pipeline layout and pipe diameter selection and valve switch control, relying on the pressure difference of the gas in the pipeline, so that the gas flows from the end with higher pressure to the end with lower pressure.

[0040] Through the above method, the exhaust gas from the mobile tank, condensate tank and wastewater tank can be jointly treated to more efficiently reduce the emission of exhaust gas.

[0041] Continue to refer Figure 3 , Figure 3 A schematic diagram showing an example of a portion of a processing system 300 for mobile tank cleaning according to an embodiment of the present specification. Figure 3 Can be based on Figure 2 An example of a part of a processing system 200 for mobile tank cleaning is shown in FIG. In order to avoid repeated description, only the differences are described here.

[0042] like Figure 3 As shown, the processing system 300 for mobile tank cleaning may further include a control device 3100. The wastewater discharge regulating device 380 may include a wastewater pump 381, a circulation loop valve 382, ​​and a wastewater output valve 383. The wastewater tank 370 may have a liquid level sensor.

[0043] The control device 3100 may be configured to send a start cycle instruction to the wastewater discharge regulating device 380 in response to the liquid level in the wastewater tank 370 reaching a first predetermined liquid level threshold. In some examples, the control device 3100 may compare the reading of the liquid level sensor with the first predetermined liquid level threshold (e.g., 20%) to determine whether the liquid level in the wastewater tank 370 reaches the first predetermined liquid level threshold.

[0044] The wastewater discharge regulating device 380 can be used to: in response to receiving a start circulation instruction, control the wastewater pump 381 to open, control the circulation loop valve 382 to open, and control the wastewater output valve 383 to close, so that the wastewater pump 381 will return the liquid temporarily stored in the wastewater tank 370 to the wastewater tank 370 through the circulation loop.

[0045] It should be noted that Figure 3 The detailed description of the second gas replacement device 312, the spray device 322, the wastewater tank 370, the wastewater discharge regulating device 380 and the wastewater tank gas delivery device 390 can be referred to Figure 2 The descriptions of the second gas replacement device 212, the spraying device 222, the wastewater tank 270, the wastewater discharge regulating device 280 and the wastewater tank gas conveying device 290 in the embodiment are not repeated here.

[0046] By means of the above method, the liquid temporarily stored in the wastewater tank can be fully mixed in a timely manner, thereby facilitating subsequent treatment of the wastewater.

[0047] Figure 4A schematic diagram showing yet another example of a portion of a processing system 400 for mobile tank cleaning according to an embodiment of the present specification. Figure 4 Can be based on Figure 3 An example of a part of a processing system 300 for mobile tank cleaning is shown in FIG. In order to avoid repeated description, only the differences are described here.

[0048] like Figure 4 As shown, the processing system 400 for mobile tank cleaning may further include a cooler 486 disposed in the circulation loop. The wastewater tank 470 may further include a temperature indicator controller (TIC) 488 for monitoring the temperature of the liquid in the wastewater tank 470.

[0049] The control device 4100 can be further used to: determine whether the temperature of the liquid in the wastewater tank 470 meets the water temperature requirement according to the reading of the temperature display controller 488; in response to not meeting the water temperature requirement, send a start instruction to the cooler 486 so that the liquid temporarily stored in the wastewater tank 470 is cooled by the cooler 488 during the circulation process. In one example, the water temperature requirement can be, for example, that the temperature of the liquid in the wastewater tank 470 is lower than a preset temperature threshold. In some examples, the control device 4100 can obtain a reading from the temperature display controller 488, and then determine whether the temperature of the liquid in the wastewater tank 470 meets the water temperature requirement (for example, whether it is less than 45°C). When the reading shows that the water temperature does not meet the water temperature requirement, the control device 4100 can send a start instruction to the cooler 486. In some examples, starting the cooler can be achieved by injecting a cooling medium into the heat exchanger. It can be understood that when only the wastewater pump 481 is started and the cooler 486 is not started, the cooler 486 does not affect the circulation process of the liquid temporarily stored in the wastewater tank 470 in the circulation loop. When the cooler 486 is started, the liquid temporarily stored in the waste water tank 470 can be cooled by the cooler 486 while circulating in the circulation loop. In the above manner, the liquid level can be used to automatically control the timing of triggering the water circulation, and the timing of starting the cooling in the process of the water circulation can be further controlled in conjunction with the water temperature monitoring, so that the automatic circulation cooling can be started at the appropriate time, which will not cause excessive energy consumption due to starting the circulation cooling too early, and can ensure that the water temperature requirements are finally met as much as possible.

[0050] In some examples, the control device 4100 can also be used to: in response to the start of the cooler 486 and the wastewater pump 481 is not turned on, send a start cycle instruction to the wastewater discharge regulating device 480 to control the wastewater pump 481 to start, control the circulation loop valve 482 to open, and control the wastewater output valve 483 to close. It can be understood that through the above method, even if the liquid level in the wastewater tank has not reached the first predetermined liquid level threshold, the temperature indicator can be used to trigger the circulation cooling, so as to speed up the cooling process and improve the wastewater processing speed of the entire system.

[0051] In some examples, the wastewater tank 470 may also have a water quality organic pollution detector for detecting the degree of organic pollution of the liquid in the wastewater tank 470. The above-mentioned preset wastewater treatment index requirements may also include water quality organic pollution index requirements. In one example, the degree of organic pollution of the liquid can be represented by total organic carbon (TOC). The water quality organic pollution index requirement can be, for example, that TOC is lower than a preset total organic carbon threshold.

[0052] In these examples, the control device 4100 can be further used to: determine whether the water quality organic pollution index of the liquid in the wastewater tank 470 meets the water quality organic pollution index requirement according to the reading of the water quality organic pollution detector; in response to meeting the water temperature requirement and the water quality organic pollution index requirement and the liquid level in the wastewater tank 470 reaching the second predetermined liquid level threshold, send a wastewater discharge control signal to the wastewater discharge regulating device 480; and in response to not meeting the water quality organic pollution index requirement and the liquid level in the wastewater tank reaching the third predetermined liquid level threshold, send information indicating the start of the process of removing the liquid with excessive water quality organic pollution to the target device. Among them, the second predetermined liquid level threshold is usually greater than the first predetermined liquid level threshold, and the third predetermined liquid level threshold is usually not less than the second predetermined liquid level threshold. In some examples, the third predetermined liquid level threshold can be used to indicate the liquid level close to the maximum capacity limit of the wastewater tank 470. In some examples, the target device may include a terminal device used by an operator. In some examples, the information indicating the start of the process of removing the liquid with excessive water quality organic pollution can be a text prompt, a pop-up window alarm, or an audible and visual signal on the user interface. In some examples, the target equipment may include the spray equipment 422 and the wastewater pump 481. In some examples, the information instructing to start the process of removing the liquid with excessive organic pollution in water quality may be a control instruction instructing to stop working.

[0053] In this case, it usually means that the treatment system alone may not be able to make the water quality meet the standard. Accordingly, the spraying and wastewater discharge can be stopped, waiting for the operator to perform subsequent treatment operations, such as connecting the wastewater tank to the wastewater transport vehicle and adding treatment agents to make the wastewater meet the indicators before discharging it to the wastewater treatment facility for further treatment.

[0054] It should be noted that the present application does not limit the order of judging whether the temperature of the liquid from the wastewater tank meets the water temperature requirements and whether the water quality organic pollution index of the liquid in the wastewater tank meets the water quality organic pollution index requirements. For example, the judgment can be made in an order different from that shown in the figure.

[0055] It should also be noted that the judgment of the present application on whether the temperature of the liquid from the wastewater tank meets the water temperature requirements and whether the water quality organic pollution index of the liquid in the wastewater tank meets the water quality organic pollution index requirements can be repeated until both indicators meet the corresponding requirements.

[0056] In these examples, the wastewater discharge regulating device 480 can be used to: in response to receiving the wastewater discharge control signal, control the wastewater pump 481 to open, control the circulation loop valve 482 to close, and control the wastewater output valve 483 to open, so that the wastewater pump 481 can discharge the liquid temporarily stored in the wastewater tank 470 to the wastewater main ( Figure 4 not shown).

[0057] Through the above method, the liquid in the wastewater tank can be treated harmlessly as much as possible, so that the wastewater discharged into the wastewater main can meet the requirements of various preset wastewater treatment indicators.

[0058] Reference below Figure 5 , Figure 5 A schematic diagram of yet another example of a processing system 500 for mobile tank cleaning according to an embodiment of the present specification is shown.

[0059] like Figure 5As shown, the processing system 500 for mobile tank cleaning includes at least two corresponding first gas replacement devices (e.g., first gas replacement device 510 and first gas replacement device 510'), at least two tank cleaning devices (e.g., tank cleaning device 520 and tank cleaning device 520'), at least two wastewater tanks (e.g., wastewater tank 570 and wastewater tank 570') and corresponding at least two wastewater discharge regulating devices (e.g., wastewater discharge regulating device 580 and wastewater discharge regulating device 580'). Each wastewater tank is directly or indirectly connected to a corresponding tank cleaning device and a corresponding wastewater discharge regulating device. In some examples, the replacement gas (e.g., nitrogen) used by at least two first gas replacement devices (e.g., first gas replacement device 510 and first gas replacement device 510', etc.) can be drawn from the same gas supply pipeline. Similarly, in some examples, the water used by at least two tank cleaning devices (e.g., tank cleaning device 520 and tank cleaning device 520') can be drawn from the same water supply pipeline.

[0060] The processing system 500 for mobile tank cleaning may also include a control device 5100. The control device 5100 may be used to: when several indicators of the liquid in at least two wastewater tanks meet the preset wastewater treatment indicator requirements and are ready to send a wastewater discharge control signal to the wastewater discharge regulating device corresponding to one of them, determine the time from the closing of the corresponding wastewater output valves of all other wastewater discharge regulating devices to the current moment, and when the time exceeds the predetermined time threshold, send a wastewater discharge control signal to the wastewater discharge regulating device, and send a waiting wastewater discharge control signal to other wastewater discharge regulating devices, so that the above-mentioned at least two wastewater discharge regulating devices do not discharge wastewater into the wastewater main at the same time. In some examples, when several indicators of the liquid in at least two wastewater tanks (e.g., wastewater tank 570 and wastewater tank 570') meet the preset wastewater treatment indicator requirements (e.g., TOC is lower than the preset total organic carbon threshold, and the water temperature is lower than the preset temperature threshold), the control device 5100 may send wastewater discharge control information to the wastewater discharge regulating device corresponding to one of them. Specifically, if the control device 5100 is ready to discharge the wastewater in the wastewater tank 570, it can start timing from the time when the corresponding wastewater output valves of all other wastewater discharge regulating devices (such as the wastewater discharge regulating device 580', etc.) are closed. When the timing time exceeds the predetermined time threshold (for example, 5 minutes), a wastewater discharge control signal can be sent to the wastewater discharge regulating device 580 corresponding to the wastewater tank 570, and a waiting wastewater discharge control signal can be sent to other wastewater discharge regulating devices (such as the wastewater discharge regulating device 580', etc.). It can be understood that when receiving the wastewater discharge control signal, the wastewater discharge regulating device can control the wastewater pump to open, control the circulation loop valve to close, and control the wastewater output valve to open, so that the wastewater pump discharges the liquid temporarily stored in the wastewater tank to the wastewater main; when receiving the waiting wastewater discharge control signal, the wastewater discharge regulating device can close the wastewater output valve to prohibit the liquid temporarily stored in the wastewater tank from being discharged to the wastewater main.

[0061] In these examples, wastewater from at least two wastewater discharge regulating devices is collected into the same wastewater main to be transported to the wastewater treatment facility for further treatment. In this case, it is required that at least two wastewater discharge regulating devices included in the treatment system 500 for mobile tank cleaning do not discharge wastewater at the same time, and wastewater from at least two wastewater discharge regulating devices does not substantially mix with each other in the wastewater main. For example, if the wastewater discharge regulating device 580' is in the wastewater discharge start state, it means that the liquid in the wastewater tank 570' is being discharged, and at this time the control device 5100 can prohibit the wastewater discharge regulating device 580 from discharging wastewater into the wastewater main.

[0062] In some examples, the control device 5100 can also be used for: when several indicators of the liquid in at least two wastewater tanks meet the preset wastewater treatment indicator requirements and are ready to send a wastewater discharge control signal to the corresponding wastewater discharge regulating device of one of them, when it is determined that the corresponding wastewater output valves of all other wastewater discharge regulating devices are closed and the wastewater main has been flushed with more than a threshold amount of water since the last wastewater discharge, a wastewater discharge control signal is sent to the wastewater discharge regulating device, and a waiting wastewater discharge control signal is sent to other wastewater discharge regulating devices, so that the above-mentioned at least two wastewater discharge regulating devices do not discharge wastewater into the wastewater main at the same time.

[0063] It should be noted that Figure 5 The detailed description of the tail gas condensing device 530, the condensate tank 540, the non-electric gas conveying device 550 and the factory wind supplementary device 560 can be referred to Figure 1 The descriptions of the tail gas condensing device 130 , the condensate tank 140 , the non-electric gas conveying device 150 and the factory air supplementing device 160 in the embodiment are not repeated here.

[0064] Through the above method, chemical reactions between wastewaters from different tank cleaning processes can be avoided. By setting up a wastewater tank to temporarily store wastewater and the control strategy of the corresponding wastewater discharge regulation equipment, it is possible to operate multiple cleaning stations simultaneously, greatly improving the cleaning efficiency of the mobile tank.

[0065] Continue to refer Figure 6 , Figure 6 A signaling diagram showing an example of an interaction process 600 between a control device and other devices in a processing system for mobile tank cleaning according to an embodiment of the present specification.

[0066] like Figure 6 As shown, at S610, the control device receives input on-site cleaning task information.

[0067] In this example, the on-site cleaning task information can be used to indicate various information related to the cleaning task of the mobile tank to be cleaned. In some examples, the on-site cleaning task information can come from a programmable logic controller (PLC) arranged at the cleaning station. In some examples, the staff can input or select the corresponding on-site cleaning task information to the PLC arranged at the mobile tank cleaning station according to the type of the mobile tank to be cleaned, the type of items loaded, etc.

[0068] At S620, task verification is performed on the received on-site cleaning task information according to the stored task information.

[0069] In this embodiment, the cleaning task information to be executed can be stored in advance. When the on-site cleaning task information is received, it can be determined whether there is matching cleaning task information in the stored cleaning task information to be executed. If so, it is determined that the task verification has passed; if not, it is determined that the task verification has failed.

[0070] At S630 , it is determined whether the status of the non-electric gas delivery device and the corresponding exhaust gas valve meets the preset exhaust gas delivery path requirements.

[0071] In this embodiment, a number of exhaust valves can be set on the exhaust gas delivery passage, so that when the non-electric gas delivery equipment is operating normally, the corresponding valve state is set to ensure that the residual gas discharged from the inside of the mobile tank can smoothly reach the factory air replenishment equipment through the exhaust gas condensation equipment, condensate tank, etc. The preset exhaust gas delivery passage requirements can be used to indicate the state that the non-electric gas delivery equipment and the corresponding exhaust gas valves should be in in order to smoothly transport the exhaust gas, for example, the non-electric gas delivery equipment is in a normal operating state or a ready state, and the corresponding valve is in an open or closed state. According to the design of the actual exhaust gas delivery passage, the states that each target valve indicated by the preset exhaust gas delivery passage requirements should be in may be different.

[0072] At S640 , in response to the task verification being passed and determining that the corresponding state meets the preset exhaust gas delivery path requirements, an instruction is sent to the first gas replacement device to allow the start of gas replacement.

[0073] In this embodiment, the first gas replacement device may start the gas replacement process only after receiving an instruction allowing the start of gas replacement.

[0074] At S650 , in response to the air pressure inside the mobile tank body meeting the preset negative pressure requirement, an instruction is sent to allow the manhole to be opened and to allow the tank cleaning equipment to be started.

[0075] In the present embodiment, the preset negative pressure requirement may indicate that the air pressure inside the mobile tank is less than the atmospheric pressure. In some examples, the preset negative pressure requirement may specifically indicate the air pressure range. In some embodiments, an instruction indicating permission to open the manhole may be sent to the manhole locking device. The manhole locking device allows the manhole to be opened only after receiving an instruction indicating permission to open the manhole. In some embodiments, an instruction indicating permission to start the tank cleaning device may be sent to the tank cleaning device. In the present embodiment, the manhole may be opened only after receiving an instruction to open the manhole. In the present embodiment, the tank cleaning device may start the cleaning process inside the mobile tank only after receiving an instruction allowing the tank cleaning device to be started.

[0076] Through the above method, it is possible to automatically check whether the preparations of various equipment of the mobile tank are ready before the formal cleaning, combined with task verification, exhaust gas transmission path, negative pressure requirements before opening the manhole, gas replacement requirements before tank cleaning, etc., thereby providing a good foundation for the subsequent smooth cleaning and the treatment of wastewater and exhaust gas generated during the cleaning process.

[0077] Continue to refer Figure 7 , Figure 7 A schematic diagram of another example of a processing system 700 for mobile tank cleaning according to an embodiment of the present specification is shown. Figure 7 Can be based on Figure 1 Another example of a processing system 100 for mobile tank cleaning is shown in FIG. In order to avoid repeated description, only the differences are described here.

[0078] like Figure 7 As shown, the tank cleaning device 720 may include a tank cleaning pump. The processing system 700 for mobile tank cleaning may also include a control device 7100 and a cleaning wastewater transfer pump 792. The cleaning wastewater transfer pump 792 may be used to transport the wastewater generated during the cleaning process of the tank cleaning device 720 on the inside of the mobile tank to the wastewater tank 770. The control device 7100 may be further used to: in response to detecting that the tank cleaning pump starts working, send a start instruction to the cleaning wastewater transfer pump 792 after a preset time interval. Usually, after the tank cleaning pump starts working, it will continue to work until the cleaning process of the inside of the mobile tank is completed. In some examples, the preset time interval may be, for example, 30 seconds, 1 minute, 3 minutes, etc. Thus, the timing of transporting wastewater to the wastewater tank can be automatically controlled in combination with the cleaning process of the mobile tank, which is more accurate and reasonable.

[0079] Next reference Figure 8 , Figure 8 A schematic diagram of yet another example of a processing system 800 for mobile tank cleaning according to an embodiment of the present specification is shown. Figure 8 Can be based on Figure 7 Another example of a processing system 700 for mobile tank cleaning is shown in FIG. In order to avoid repeated description, only the differences are described here.

[0080] like Figure 8As shown, the processing system 800 for mobile tank cleaning may also include a spray device 822 connected to the wastewater tank 870. The spray device 822 may be used to clean the inner wall of the wastewater tank 870. The control device 8100 may be further used to: in response to detecting that the tank cleaning pump stops working and the liquid level in the wastewater tank 870 drops to a fourth predetermined liquid level threshold, send a start instruction to the spray device 822 connected to the wastewater tank 870 to clean the wastewater tank 870; in response to detecting that the liquid level in the wastewater tank 870 drops from the fourth predetermined liquid level threshold to the fifth predetermined liquid level threshold, send a shutdown instruction to the wastewater pump included in the wastewater discharge regulating device 880. It can be understood that the fourth predetermined liquid level threshold is less than the second predetermined liquid level threshold as described above, and the fifth predetermined liquid level threshold is less than the first predetermined liquid level threshold as described above. In some examples, the fourth predetermined liquid level threshold may be less than the first predetermined liquid level threshold as described above. In some examples, the specific cleaning process can refer to the description of the tank cleaning device cleaning the inside of the mobile tank, which will not be repeated here. Through the above method, the timing of cleaning the wastewater tank and stopping the wastewater pump can be automatically controlled in combination with the tank cleaning process. On the basis of achieving the cleaning of the wastewater tank, the air pressure fluctuation caused by evacuating the liquid in the wastewater tank can also be avoided. The process is more reasonable and effective, and provides a basis for the reuse of clean wastewater tanks.

[0081] Continue to refer Fig. 9 , Fig. 9 A flow chart of an example of a control method 900 applied to a processing system for mobile tank cleaning according to an embodiment of the present specification is shown. The processing system for mobile tank cleaning can refer to the corresponding description in the aforementioned embodiment. The control method 900 can be performed by a distributed control system (DCS) and a programmable logic controller. In some examples, the DCS can also be integrated into a factory automation control and management system. In some examples, the PLC can be arranged at the cleaning station site.

[0082] like Fig. 9 As shown, at S910, in response to determining that the mobile tank has completed electrostatic grounding, the programmable logic controller generates status information indicating that the mobile tank has completed electrostatic grounding.

[0083] In this embodiment, the programmable logic controller can detect whether the mobile tank body has completed electrostatic grounding. When it is determined that the electrostatic grounding has been completed, status information indicating that the mobile tank body has completed electrostatic grounding can be generated. In some examples, when the mobile tank body (such as a tank truck) is docked at a designated cleaning station, the on-site operator can do a good job of electrostatic grounding. At this time, the corresponding sensor can detect that the tank body has completed electrostatic grounding, for example, it is recognized that the resistance value of the grounding resistor falls within a predetermined resistance range or the electrostatic field strength meets the predetermined requirements. Accordingly, the programmable logic controller can receive the information of the above-mentioned sensor and determine that the mobile tank body has completed electrostatic grounding, so as to generate status information indicating that the mobile tank body has completed electrostatic grounding. For example, the grounding state of the mobile tank body can be set to "grounded". For another example, "grounding successful" can be displayed on the interactive interface.

[0084] At S920 , in response to receiving the input on-site cleaning task information and the status information indicating that the mobile tank has completed the electrostatic grounding, the programmable logic controller transmits the on-site cleaning task information to the distributed control system.

[0085] In this embodiment, the description of the on-site cleaning task information can refer to the aforementioned Figure 6 Corresponding description of step S610 in the embodiment. When the programmable logic controller receives the cleaning task information and determines that the status information indicates that the mobile tank has completed the electrostatic grounding, it can synchronously transmit the on-site cleaning task information to the distributed control system.

[0086] At S930, in response to receiving confirmation information indicating confirmation of the on-site cleaning task information, the distributed control system activates the tank cleaning program and sends an instruction to the programmable logic controller indicating permission to perform tank cleaning.

[0087] In this embodiment, the on-site cleaning task information transmitted from the programmable logic controller to the distributed control system can be confirmed by humans (e.g., operators in the central control room) or the distributed control system, for example, whether the information is correct or consistent with the corresponding task information in the database can be checked. When the information is confirmed to be consistent, the distributed control system can receive confirmation information confirming the on-site cleaning task information. After that, the distributed control system can activate the local tank cleaning program and send an instruction to the programmable logic controller to allow tank cleaning.

[0088] At S940, in response to receiving the on-site confirmation information indicating that cleaning is ready and receiving the instruction sent by the distributed control system indicating that tank cleaning is allowed, the programmable logic controller sends first notification information indicating that cleaning is ready to the distributed control system.

[0089] In this embodiment, the on-site confirmation information may be confirmation information received by the programmable logic controller from the mobile tank cleaning station site. In some examples, when the programmable logic controller receives an instruction sent by the distributed control system indicating that tank cleaning is allowed, the "cleaning ready" button can be activated on the interactive page of the programmable logic controller, for example, the state of the "cleaning ready" button is set to a clickable state. The on-site operator can click the above-mentioned "cleaning ready" button, which means that the programmable logic controller receives the on-site confirmation information indicating the start of cleaning. After receiving the on-site confirmation information indicating that cleaning is ready and having received the instruction sent by the distributed control system indicating that tank cleaning is allowed, the programmable logic controller can send a first notification information indicating that the cleaning site is ready to the distributed control system. The first notification information for indicating that the cleaning site is ready can be in various forms, for example, it can be "1", "000001", etc.

[0090] At S950, in response to receiving the first notification information, the distributed control system checks the status of the non-electric gas delivery equipment and the corresponding exhaust valve, and sends a second notification information to the programmable logic controller indicating that the gas replacement conditions are ready when the exhaust gas delivery passage meets the preset requirements.

[0091] In this embodiment, the second notification information for indicating that the gas replacement condition is ready can be in various forms, such as "10", "000010", etc. The operation of checking the status of the non-electric gas delivery equipment and the corresponding exhaust gas valve and judging whether the exhaust gas delivery path meets the preset requirements can refer to the aforementioned Figure 6 Relevant description of step S630 in the embodiment.

[0092] At S960, in response to receiving the second notification information, the programmable logic controller sends a corresponding gas replacement control instruction to the first gas replacement device according to the gas replacement method indicated by the on-site cleaning task information.

[0093] In this embodiment, the programmable logic controller can start the gas replacement process only when the second notification information is received. In some examples, the gas replacement control instruction can be used to indicate the start of the air or nitrogen replacement process, so as to control the opening or closing of the corresponding valve. In some examples, the gas replacement process can also include a vacuuming process after replacement with air or nitrogen, so that the air pressure inside the mobile tank is lower than the external atmospheric pressure. In some examples, the above-mentioned vacuuming process can also be triggered by the local operator clicking the "Start Vacuuming" button on the human-computer interaction interface.

[0094] At S970, in response to the air pressure inside the mobile tank body meeting the preset negative pressure requirement, the programmable logic controller sends a third notification message indicating permission to open the manhole and permission to place the tank cleaning device inside the mobile tank body.

[0095] In this embodiment, the third notification information can be used to indicate that the manhole is allowed to be opened and the tank cleaning equipment (such as the spray head therein) is allowed to be placed in the mobile tank. The third notification information can be in various forms, such as "11", "000100", etc. The manhole locking device allows the manhole to be opened only after receiving the above third notification information. In some embodiments, the on-site operator can open the manhole and place the tank cleaning equipment (such as the spray head therein) in the mobile tank.

[0096] At S980, in response to receiving an on-site operation instruction instructing to start cleaning, the distributed control system checks the status of the wastewater tank and the wastewater discharge regulating equipment, and when the checked status meets the preset wastewater receiving status requirements, sends a fourth notification message to the programmable logic controller indicating that cleaning can be started.

[0097] In this embodiment, the on-site operation instruction for instructing to start cleaning can be an instruction for instructing to start cleaning received from the mobile tank cleaning station site and synchronized by the programmable logic controller to the distributed control system. In some examples, when the on-site operator completes the various preparatory tasks before cleaning, he can click the "Start Cleaning" button, which means that the programmable logic controller receives the on-site operation instruction for instructing to start cleaning. After that, the programmable logic controller can synchronize the received on-site operation instruction for instructing to start cleaning to the distributed control system. In some examples, the various preparatory tasks before cleaning can include determining whether it is necessary to manually drain the residual liquid in the mobile tank, and connecting the wastewater delivery pipeline when it is drained or not. After receiving the on-site operation instruction for instructing to start cleaning, the distributed control system can check the status of the wastewater tank and the wastewater discharge regulating device, and send a fourth notification message to the programmable logic controller indicating that the cleaning is allowed to start when the checked status meets the preset wastewater receiving status requirements. In some examples, the preset wastewater receiving status requirements can, for example, include that the wastewater tank has been cleaned and the wastewater discharge regulating device prohibits the discharge of liquid in the wastewater tank. In this embodiment, the fourth notification information for indicating that the start of cleaning is allowed may be in various forms, for example, "100", "001000" and the like.

[0098] At S990, in response to receiving the fourth notification information, the programmable logic controller sends a control instruction to the tank cleaning device to start cleaning.

[0099] In this embodiment, the tank cleaning device can start the cleaning process of the inside of the mobile tank only after receiving the control instruction to start the cleaning. In some examples, the control instruction to start the cleaning may include an instruction to switch the corresponding valve state, for example, it may include an instruction to close the original exhaust system valve and open the valve of the exhaust pipeline with the spray head. In some examples, the control instruction to start the cleaning may also include an instruction to start the main cleaning program, such as sequentially performing steam preheating, water washing, detergent washing, water washing, etc.

[0100] In some examples, the tank cleaning device may include a main cleaning pump. The processing system for mobile tank cleaning may also include a cleaning wastewater transfer pump. The cleaning wastewater transfer pump may be used to transport wastewater generated during the cleaning process of the tank cleaning device on the inside of the mobile tank to the wastewater tank. After S910-S990, the control method 900 may also include S991-S999.

[0101] At S991 , in response to the main wash pump being started, the programmable logic controller sends fifth notification information indicating that the main wash pump has started washing to the distributed control system.

[0102] In this embodiment, the fifth notification information indicating that the main cleaning pump has started cleaning may be in various forms, such as "101", "010000", etc. In some examples, the programmable logic controller may obtain the start status of the main cleaning pump, and when the main cleaning pump is started, the programmable logic controller may synchronize information with the distributed control system.

[0103] In S993, in response to receiving the fifth notification information, the distributed control system sends a start instruction to the cleaning wastewater transfer pump after a preset time interval.

[0104] The above steps can at least refer to the above Figure 7 The corresponding description in the embodiments.

[0105] At S995, in response to receiving the on-site operation instruction indicating that the cleaning is completed, the programmable logic controller sends sixth notification information indicating that the cleaning is completed to the distributed control system.

[0106] In the present embodiment, the on-site operation instruction indicating the completion of cleaning can be an instruction received by the programmable logic controller from the mobile tank cleaning station site indicating the completion of cleaning. In some examples, when the main cleaning is completed (for example, the main cleaning pump stops running), the on-site operator can click the "complete cleaning" button, which means that the programmable logic controller receives the on-site operation instruction indicating the completion of cleaning. In some examples, when the main cleaning program is completed, the "complete cleaning" button can be activated on the interactive page of the programmable logic controller, for example, the state of the "complete cleaning" button is set to a clickable state. In the present embodiment, the sixth notification information for indicating that the cleaning is completed can be in various forms, for example, it can be "110", "100000", etc.

[0107] In S997, in response to receiving the sixth notification information, the distributed control system sends a shutdown instruction to the cleaning wastewater transfer pump.

[0108] In this embodiment, receiving the sixth notification information often means that the cleaning procedure no longer generates new tank cleaning wastewater, and the cleaning wastewater transfer pump can be turned off to save energy.

[0109] In S999, the distributed control system sends corresponding control instructions to the wastewater discharge regulating equipment according to whether several indicators of the liquid in the wastewater tank meet the preset wastewater treatment indicator requirements.

[0110] In some optional implementations, when several indicators of the liquid in the wastewater tank do not meet the preset wastewater treatment index requirements, the distributed control system may send corresponding control instructions to the wastewater discharge regulating device to prohibit the discharge of the liquid in the wastewater tank. In some examples, when several indicators of the liquid in the wastewater tank meet the preset wastewater treatment index requirements, the distributed control system may send corresponding control instructions to the wastewater discharge regulating device to allow the discharge of the liquid in the wastewater tank. In some examples, the preset wastewater treatment index requirements may include water temperature requirements, water quality organic pollution index requirements, etc. In some examples, when there are multiple sets of corresponding first gas replacement equipment, tank cleaning equipment, wastewater tanks and wastewater discharge regulating equipment, the distributed control system may send corresponding control instructions to the corresponding wastewater discharge regulating equipment when several indicators of the liquid in multiple wastewater tanks meet the preset wastewater treatment index requirements, so that at least two wastewater discharge regulating devices do not discharge wastewater into the wastewater main at the same time. The above-mentioned specific operations can refer to the aforementioned Figure 1-Figure 8 The relevant description in the embodiments will not be repeated here.

[0111] use Figure 1-Figure 9The treatment system for mobile tank cleaning and the control method applied to the treatment system disclosed in the invention can provide good conditions for tank cleaning through gas replacement equipment, collect residual gas discharged from the inside of the mobile tank through tail gas condensation equipment, and further use the condensate tank to separate the discharged residual gas into gas and liquid, and then use non-electric gas conveying equipment to suck the residual gas and convey it to the factory wind replenishment equipment, the factory wind replenishment equipment adjusts the flow rate of the replenished factory wind according to the gas output flow rate of the non-electric gas conveying equipment, and then through the setting of the wastewater tank and the wastewater discharge regulating equipment, it is ensured that the wastewater can be discharged only after several indicators meet the requirements, thereby providing a wastewater and waste gas joint pretreatment scheme for the mobile tank cleaning process, ensuring that the wastewater and waste gas transported to the downstream equipment meet the preset requirements, and providing a basis for further centralized treatment of wastewater and waste gas.

[0112] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0113] Not all steps and units in the above-mentioned processes and system structure diagrams are necessary, and some steps or units can be ignored according to actual needs. The execution order of each step is not fixed and can be determined according to needs. The device structure described in the above-mentioned embodiments can be a physical structure or a logical structure, that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or some components in multiple independent devices may be implemented together.

[0114] The term "exemplary" as used throughout this specification means "serving as an example, instance, or illustration" and does not imply "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, the techniques may be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0115] The optional implementation modes of the embodiments of the present specification are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present specification are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present specification, various simple modifications can be made to the technical solutions of the embodiments of the present specification, and these simple modifications all belong to the protection scope of the embodiments of the present specification.

[0116] The above description of the contents of this specification is provided to enable any person of ordinary skill in the art to implement or use the contents of this specification. Various modifications to the contents of this specification will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the contents of this specification. Therefore, the contents of this specification are not limited to the examples and designs described herein, but are consistent with the widest range of principles and novel features disclosed herein.

Claims

1. A processing system for mobile tank cleaning, comprising: A first gas replacement device, used to discharge the residual gas inside the mobile tank; Tank cleaning equipment, used to clean the inside of the mobile tank; Tail gas condensing equipment, used to condense the residual gas to obtain liquefied waste liquid and unliquefied waste gas; A condensate tank, used to further separate the unliquefied waste gas and temporarily store the liquefied waste liquid; A non-electric gas conveying device, used for sucking the residual gas so that the residual gas passes through the tail gas condensing device and the condensate tank in sequence, and conveying the exhaust gas from the condensate tank to the factory air supplement device; The factory air supplement device is used to adjust the flow rate of the supplemented factory air according to the gas output flow rate of the non-electric gas transmission device, so that the sum of the flow rate of the supplemented factory air and the gas output flow rate meets the preset exhaust gas treatment flow requirement; a waste water tank for temporarily storing waste liquid from the condensate tank and cleaning waste water generated by cleaning the interior of the mobile tank; and The wastewater discharge regulating device is used to allow the liquid in the wastewater tank to be discharged when several indicators of the liquid in the wastewater tank meet the preset wastewater treatment indicator requirements.

2. The processing system of claim 1 , further comprising: A spraying device and a second gas replacement device connected to the wastewater tank, The spraying equipment is used to clean the inner wall of the wastewater tank; The second gas replacement device is used to discharge the gas inside the wastewater tank; Wastewater tank gas delivery equipment, used to deliver the gas discharged from the wastewater tank to the factory air replenishment equipment; and The factory air supplement equipment is further used to adjust the flow rate of the supplemented factory air according to the gas output flow rate of the non-electric gas transmission equipment and the flow rate of the gas discharged from the wastewater tank, so that the sum of the flow rate of the supplemented factory air, the flow rate of the gas discharged from the wastewater tank and the gas output flow rate meets the preset exhaust gas treatment flow requirement.

3. The processing system of claim 1, wherein the plant air replenishment device comprises a flow control device and the non-electric gas delivery device comprises a gas injector.

4. The processing system according to claim 2 or 3, wherein: The treatment system further comprises a control device, the wastewater discharge regulating device comprises a wastewater pump, a circulation loop valve and a wastewater output valve, the wastewater tank has a liquid level sensor, and the control device is used to: In response to the liquid level in the wastewater tank reaching a first predetermined liquid level threshold, sending a start cycle instruction to the wastewater discharge regulating device, The wastewater discharge regulating device is used to control the wastewater pump to open, the circulation loop valve to open, and the wastewater output valve to close in response to receiving the start circulation instruction, so that the wastewater pump can return the liquid temporarily stored in the wastewater tank to the wastewater tank through the circulation loop.

5. The processing system of claim 4, wherein: The treatment system further includes a cooler disposed in the circulation loop, the wastewater tank further includes a temperature display controller for monitoring the temperature of the liquid in the wastewater tank, the preset wastewater treatment index requirement includes a water temperature requirement, and the control device is further used for: determining whether the temperature of the liquid in the waste water tank meets the water temperature requirement according to the reading of the temperature display controller; and In response to the water temperature requirement not being met, a start instruction is sent to the cooler so that the liquid temporarily stored in the waste water tank is cooled by the cooler during the circulation process.

6. The processing system of claim 5, wherein: The wastewater tank also has a water quality organic pollution detector for detecting the degree of organic pollution of the liquid in the wastewater tank, the preset wastewater treatment index requirements also include water quality organic pollution index requirements, and the control device is further used to: Determining whether the water quality organic pollution index of the liquid in the wastewater tank meets the water quality organic pollution index requirement according to the reading of the water quality organic pollution detector; In response to the water temperature requirement and the water quality organic pollution index requirement being met and the liquid level in the wastewater tank reaching a second predetermined liquid level threshold, sending a wastewater discharge control signal to the wastewater discharge regulating device, wherein the second predetermined liquid level threshold is greater than the first predetermined liquid level threshold; and In response to not meeting the water quality organic pollution index requirement and the liquid level in the wastewater tank reaching a third predetermined liquid level threshold, sending information to the target device indicating starting a process for removing liquid with excessive water quality organic pollution, wherein the third predetermined liquid level threshold is not less than the second predetermined liquid level threshold, The wastewater discharge regulating device is used to control the wastewater pump to open, the circulation loop valve to close, and the wastewater output valve to open in response to receiving the wastewater discharge control signal, so that the wastewater pump can discharge the liquid temporarily stored in the wastewater tank to the wastewater main pipe.

7. The processing system of claim 1, wherein: The treatment system comprises at least two corresponding first gas replacement devices, at least two tank cleaning devices, at least two wastewater tanks and at least two corresponding wastewater discharge regulating devices, each wastewater tank is directly or indirectly connected to a corresponding tank cleaning device and a corresponding wastewater discharge regulating device, respectively. The processing system also includes a control device for: When several indicators of the liquid in at least two wastewater tanks meet the preset wastewater treatment indicator requirements and are ready to send a wastewater discharge control signal to the corresponding wastewater discharge regulating equipment of one of them, the time from the closure of the corresponding wastewater output valves of all other wastewater discharge regulating equipment to the current moment is determined, and when the time exceeds the predetermined time threshold, a wastewater discharge control signal is sent to one of the wastewater discharge regulating equipment, and a waiting wastewater discharge control signal is sent to the other wastewater discharge regulating equipment, so that the at least two wastewater discharge regulating equipment do not discharge wastewater into the wastewater main pipe at the same time.

8. The processing system of claim 1, wherein: The processing system further comprises a control device, wherein the control device is configured to: receiving input on-site cleaning task information; Performing task verification on the received on-site cleaning task information according to the stored task information; Determining whether the status of the non-electric gas delivery equipment and the corresponding exhaust valve meets the requirements of the preset exhaust delivery path; In response to the task verification being passed and determining that the corresponding state meets the preset exhaust gas delivery path requirements, sending an instruction to the first gas replacement device indicating that the gas replacement is allowed to be started; and In response to the air pressure inside the mobile tank body meeting the preset negative pressure requirement, an instruction is sent to allow the manhole to be opened and to allow the tank cleaning equipment to be started.

9. The processing system of claim 1, wherein: The tank cleaning device includes a tank cleaning pump, and the treatment system also includes a control device and a cleaning wastewater transfer pump, wherein the cleaning wastewater transfer pump is used to transport the wastewater generated during the cleaning process of the tank cleaning device on the inside of the mobile tank to the wastewater tank, and the control device is further used to: In response to detecting that the tank cleaning pump starts to work, a start instruction is sent to the cleaning wastewater transfer pump after a preset time interval.

10. The processing system of claim 9, wherein: The wastewater discharge regulating device includes a wastewater pump, and the treatment system also includes a spraying device connected to the wastewater tank, and the spraying device is used to clean the wastewater tank; The control device is further used for: In response to detecting that the tank cleaning pump stops working and the liquid level in the wastewater tank drops to a fourth predetermined liquid level threshold, sending a start instruction to a spray device connected to the wastewater tank to clean the wastewater tank; In response to detecting that the liquid level in the wastewater tank drops from the fourth predetermined liquid level threshold to a fifth predetermined liquid level threshold, a shut-down command is sent to the wastewater pump.

11. A control method applied to the processing system according to any one of claims 1 to 10, the control method being executed by a distributed control system and a programmable logic controller, the control method comprising: In response to determining that the mobile tank has completed electrostatic grounding, the programmable logic controller generates status information indicating that the mobile tank has completed electrostatic grounding; In response to receiving the inputted on-site cleaning task information and the status information indicating that the mobile tank has completed the electrostatic grounding, the programmable logic controller transmits the on-site cleaning task information to the distributed control system; In response to receiving confirmation information indicating confirmation of the on-site cleaning task information, the distributed control system activates a tank cleaning program and sends an instruction to the programmable logic controller indicating permission to perform tank cleaning; In response to receiving the on-site confirmation information indicating that the cleaning is ready and having received the instruction sent by the distributed control system indicating that tank cleaning is allowed, the programmable logic controller sends a first notification information indicating that the cleaning site is ready to the distributed control system; In response to receiving the first notification information, the distributed control system checks the status of the non-electric gas delivery device and the corresponding exhaust valve, and sends a second notification information indicating that the gas replacement condition is ready to the programmable logic controller when the exhaust gas delivery path meets the preset requirements; In response to receiving the second notification information, the programmable logic controller sends a corresponding gas replacement control instruction to the first gas replacement device according to the gas replacement mode indicated by the on-site cleaning task information; In response to the air pressure inside the mobile tank body meeting the preset negative pressure requirement, the programmable logic controller sends a third notification message indicating permission to open the manhole and permission to place the tank cleaning device inside the mobile tank body; In response to receiving the on-site operation instruction instructing to start cleaning, the distributed control system checks the status of the wastewater tank and the wastewater discharge regulating device, and sends a fourth notification message instructing permission to start cleaning to the programmable logic controller when the checked status meets the preset wastewater receiving status requirement; as well as In response to receiving the fourth notification information, the programmable logic controller sends a control instruction to the tank cleaning device to start cleaning.

12. The control method according to claim 11, wherein: The tank cleaning equipment includes a main cleaning pump, the treatment system also includes a cleaning wastewater transfer pump, the cleaning wastewater transfer pump is used to transport the wastewater generated during the cleaning process of the tank cleaning equipment on the inside of the mobile tank to the wastewater tank, and the control method also includes: In response to the main cleaning pump being started, the programmable logic controller sends fifth notification information to the distributed control system indicating that the main cleaning pump has started cleaning; In response to receiving the fifth notification information, the distributed control system sends a start instruction to the cleaning wastewater transfer pump after a preset time interval; In response to receiving the on-site operation instruction indicating that cleaning is completed, the programmable logic controller sends sixth notification information indicating that cleaning is completed to the distributed control system; and In response to receiving the sixth notification information, the distributed control system sends a shutdown command to the cleaning wastewater transfer pump; and sends corresponding control instructions to the wastewater discharge regulating equipment based on whether several indicators of the liquid in the wastewater tank meet the preset wastewater treatment indicator requirements.

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