Papermaking process reconstituted tobacco extract flowmeter anti-clogging control system and method

Abstract

The application discloses a kind of papermaking method reconstituted tobacco infusion flowmeter anti-blocking control system and method, including acid dissolving tank, clean water tank, infusion storage tank, acid liquid storage tank and liquid passing tee valve, the inlet of liquid passing tee valve is connected with liquid supply pipeline, infusion flowmeter and infusion regulating valve are arranged on the liquid supply pipeline, and infusion flowmeter and infusion regulating valve are interlocked control;Real-time monitoring infusion flowmeter liquid supply pipeline on infusion pump current value X and infusion regulating valve opening value Y, through two-stage prevention control mode, the dirt of residual in infusion flowmeter measuring tube inner wall is cleaned in time, effectively prevents flowmeter pollution, ensures flowmeter measurement accuracy, while simple operation, reduce manual labor cost, provide effective, stable infusion flow for subsequent process, ensure that production continuously normal operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of reconstituted tobacco production, and particularly relates to a papermaking method reconstituted tobacco extraction liquid flowmeter anti-blocking control system and method. TECHNICAL BACKGROUND

[0002] In the production of papermaking method reconstituted tobacco, water is often used as a solvent for tobacco raw material extraction, and the strong stirring in the extraction process can cause the difficult-to-dissolve components, insoluble components and microparticles to disperse, emulsify and suspend in water, forming a complex system composed of colloidal solution, emulsion, colloidal solution and true solution. A large amount of suspended matter can cause the extraction liquid to be turbid, and the solid particles and the solution are difficult to completely separate. Through detection and analysis, it is found that the extraction liquid of the papermaking method reconstituted tobacco contains a large amount of organic matter such as alkaloid salt, organic acid salt, ester, sugar, protein, pectin and calcium and magnesium salt inorganic matter.

[0003] In actual production process, flowmeter is usually used to measure the flow of extraction liquid at the inlet of the equipment or transported to the subsequent process. However, the suspended matter and macromolecular substances in the extraction liquid are extremely easy to remain in the flowmeter and its connecting pipeline, which makes the flowmeter measurement inaccurate, and even causes the flowmeter to be blocked in severe cases, affecting normal production. The cleaning of the flowmeter of the existing production line usually adopts manual offline cleaning method, that is, the flowmeter and its connecting pipeline are disassembled, then the flowmeter is cleaned by manual high-pressure water gun flushing or manual brushing, and after cleaning, the flowmeter and its connecting pipeline are installed and reset. According to different product formula requirements, some products need to add flocculating agent in the extraction liquid, and after a certain reaction time, the extraction liquid is pumped to the purification equipment. At this time, the flowmeter at the inlet pipeline of the purification equipment will be blocked for 6-7 days. The frequent manual disassembly, cleaning and resetting operation mode not only has high labor intensity and long time consumption, but also affects the continuous operation of production. SUMMARY

[0004] The present application discloses a papermaking method reconstituted tobacco extraction liquid flowmeter anti-blocking control system and method to avoid the pollution and blocking of the extraction liquid flowmeter measuring pipe, ensure the accuracy of the flowmeter measurement, solve the problems of high labor intensity and long time consumption of the existing extraction liquid flowmeter which needs to be manually disassembled, offline cleaned and reset, provide effective and stable extraction liquid flow for the subsequent process, and ensure the continuous and normal operation of production.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] The invention discloses a kind of papermaking method reconstituted tobacco leaching liquid flowmeter anti-blocking control system, including acid dissolution tank, clean water tank, leaching liquid storage tank, acid liquid storage tank and liquid passing tee valve, the inlet of liquid passing tee valve is connected with liquid supply pipeline, leaching liquid flowmeter and leaching liquid regulating valve are arranged on the liquid supply pipeline, and leaching liquid flowmeter and leaching liquid regulating valve are interlocked control;

[0007] The outlet of the acid dissolution tank is connected with the liquid supply pipeline before the leaching liquid flowmeter through pipeline, acid dissolution tank outlet pump, acid liquid supply valve and leaching liquid flowmeter arranged on the pipeline, the outlet of the clean water tank is connected with the liquid supply pipeline before the leaching liquid flowmeter through pipeline, clean water pump, clean water valve and leaching liquid flowmeter arranged on the pipeline, and the outlet of the leaching liquid storage tank is connected with the liquid supply pipeline before the leaching liquid flowmeter through pipeline, leaching liquid pump, leaching liquid valve and leaching liquid flowmeter arranged on the pipeline.

[0008] The first outlet of the liquid passing tee valve is connected with leaching liquid purification process pipeline, the second outlet of the liquid passing tee valve is connected with the inlet of the acid liquid storage tank through pipeline, cleaning liquid collecting valve and acid liquid storage tank arranged on the pipeline, and the pipeline between the second outlet of the liquid passing tee valve and the inlet of the acid liquid storage tank is branched to arrange a blowdown pipeline, and cleaning liquid discharge valve is arranged on the blowdown pipeline.

[0009] The outlet of the acid liquid storage tank is connected with two pipelines in parallel, acid dissolution tank outlet pump and acid liquid circulating pump are arranged on one pipeline, and the pipeline is connected with the liquid supply pipeline before the leaching liquid flowmeter, and acid liquid storage tank blowdown valve and online pH value detection device are arranged on the other pipeline, and the pipeline is connected with the blowdown pipeline.

[0010] Further, mechanical stirring devices are arranged in the acid dissolution tank, clean water tank, leaching liquid storage tank and acid liquid storage tank, and liquid level meter is further arranged on the acid liquid storage tank.

[0011] A kind of papermaking method reconstituted tobacco leaching liquid flowmeter anti-blocking control method, process as follows, including: real-time monitoring leaching liquid pump current value X and leaching liquid regulating valve opening value Y on leaching liquid flowmeter liquid supply pipeline;

[0012] When the leaching liquid pump current value X=0A, start first level prevention control mode;

[0013] When the leaching liquid pump current value X=0A and the leaching liquid flowmeter regulating valve opening value Y is greater than or equal to 2 times the leaching liquid flowmeter regulating valve normal opening value Z or the leaching liquid pump current value X≠0A and the leaching liquid flowmeter regulating valve opening value Y is greater than or equal to 2 times the leaching liquid flowmeter regulating valve normal opening value Z, real-time monitoring flowmeter instantaneous flow value Q and leaching liquid regulating valve opening value Y, and start timing, after 15min, when flowmeter instantaneous flow is (Q±1) m 3 / h, leaching liquid regulating valve opening is Y±5%, two conditions are satisfied simultaneously, start second level prevention control mode.

[0014] The primary prevention control mode specifically comprises:

[0015] S11, trigger the switching valve position of the overflow three-way valve to disconnect the leaching liquid flow meter and the pipeline before and after it from the leaching liquid purification process, trigger the cleaning liquid collection valve to close, and then trigger the cleaning liquid discharge valve, the clean water valve and the clean water pump to open in sequence;

[0016] S12, the clean water pump pumps clean water to the leaching liquid flow meter, and the clean water flushes the leaching liquid flow meter, the leaching liquid regulating valve and the liquid supply and discharge pipelines thereof, and the flushing water is discharged to the sewage treatment through the cleaning liquid discharge valve;

[0017] S13, after the clean water flushing operation is completed, trigger the clean water pump, the clean water valve and the cleaning liquid discharge valve to close in sequence, trigger the switching valve position of the overflow three-way valve to connect the leaching liquid flow meter and the pipeline before and after it with the leaching liquid purification process pipeline, and the leaching liquid pump meets the starting condition, thereby completing the primary prevention control;

[0018] The secondary prevention control mode specifically comprises:

[0019] S21, trigger the leaching liquid pump to stop running, trigger the switching valve position of the overflow three-way valve to connect the leaching liquid flow meter and the pipeline before and after it with the leaching liquid purification process pipeline, trigger the cleaning liquid discharge valve to close, and then trigger the cleaning liquid collection valve, the acid liquid supply valve and the acid dissolving tank discharge pump to open in sequence;

[0020] S22, the acid dissolving tank discharge pump pumps acid liquid to the leaching liquid flow meter, and the acid liquid flushes the leaching liquid flow meter, the leaching liquid regulating valve and the liquid supply and discharge pipelines thereof, and the flushing acid liquid is collected to the acid liquid storage tank through the cleaning liquid collection valve;

[0021] S23, when the liquid level of the acid liquid storage tank reaches 50%, trigger the acid dissolving tank discharge pump and the acid liquid supply valve to close, trigger the acid liquid circulating valve and the acid liquid storage tank discharge pump to open, and perform the circulating acid liquid flushing between the leaching liquid flow meter, the leaching liquid regulating valve and the acid liquid storage tank;

[0022] S24, after the acid liquid flushing operation is completed, the acid liquid is collected to the acid liquid storage tank, trigger the acid liquid storage tank discharge pump to close, trigger the acid liquid storage tank blowdown valve to open, and the acid liquid is discharged to the sewage treatment;

[0023] S25, when the liquid level of the acid liquid storage tank is less than or equal to 5%, trigger the acid liquid storage tank blowdown valve to close, trigger the clean water valve, the clean water pump and the acid liquid storage tank discharge pump to open, and perform the circulating clean water flushing of the leaching liquid flow meter, the leaching liquid regulating valve and the acid liquid storage tank with clean water;

[0024] S26, after the completion of the circulating clean water flushing, triggering the acid liquid circulating valve, acid liquid storage tank outlet pump to close, triggering the acid liquid storage tank blowdown valve open, until the blowdown valve water pH value reaches 7.0±0.5;

[0025] S27, when the blowdown valve water pH value reaches 7.0±0.5, in turn trigger the clean water pump, clean water valve, cleaning fluid collection valve, acid liquid storage tank blowdown valve closed, circulating acid liquid cleaning operation is completed, trigger the liquid three-way valve switching valve position, so that the leaching liquid flow meter and its before and after pipeline and leaching liquid purification process pipeline communication, leaching liquid pump to meet the starting condition, complete the secondary prevention control.

[0026] Further, the liquid three-way valve in S11 is a pneumatic three-way L-type switch valve; the clean water in S12 is medium pressure water, the pressure is (6~8) bar, the temperature is (15~25) ℃, the flow is (20~25) m 3 / h; the clean water flushing time is (3~5) min, and the leaching liquid pump cannot start running before the clean water flushing reaches the set time.

[0027] Further, the normal opening value Z of the leaching liquid regulating valve is (30~40)%.

[0028] Further, the acid liquid in the acid liquid storage tank in S22 is one of nitric acid or sulfamic acid solution, the concentration is (10~15) wt%, the temperature is 80℃, and the flow is (15~20) m 3 / h.

[0029] Further, the circulating acid liquid cleaning time in S23 is (45~60) min, and the leaching liquid pump cannot start running before the circulating acid liquid cleaning reaches the set time.

[0030] Further, the circulating clean water cleaning time in S25 is (5~10) min.

[0031] Further, the leaching liquid flow meter is an electromagnetic flow meter or a mass flow meter.

[0032] Further, the leaching liquid flow meter is provided with two metering channels, when the flow meter executes cleaning operation, the flow meter switches to the cleaning water metering channel, the flow meter display screen measures the instantaneous flow and cumulative flow of the cleaning water, after the cleaning operation is executed, the flow meter switches to the leaching liquid metering channel, the flow meter display screen measures the instantaneous flow and cumulative flow of the leaching liquid, which is convenient for accurate collection and calculation of the leaching liquid output and delivery data in actual production process.

[0033] The beneficial effects of the present application are: the present application conceives and designs a papermaking method reconstituted tobacco leaching liquid flowmeter anti-blocking control system and method, which is specifically divided into a first prevention control mode and a second prevention control mode. The first prevention control mode mainly uses medium-pressure clean water to flush the leaching liquid flowmeter measuring pipe, leaching liquid regulating valve and its liquid supply and liquid outlet pipeline when the leaching liquid flowmeter stops measuring the leaching liquid. The second prevention control mode mainly monitors the opening value of the leaching liquid regulating valve, determines the working state of the flowmeter through the opening value of the leaching liquid regulating valve, and uses acid liquid to perform long-time acid liquid circulation cleaning on the leaching liquid flowmeter measuring pipe, leaching liquid regulating valve and its liquid supply and liquid outlet pipeline when the opening value of the leaching liquid regulating valve reaches 2 times of the normal running opening value. The present application can realize timely cleaning of the dirt remaining on the inner wall of the leaching liquid flowmeter measuring pipe, avoid the formation of a thick and difficult-to-clean dirt layer due to the long retention time of the dirt, effectively prevent the flowmeter from being blocked, the method is simple to operate, ensures the accuracy of the flowmeter measurement, solves the problems of high labor intensity and long time consumption of the existing leaching liquid flowmeter, such as manual disassembly, offline cleaning and installation reset, provides effective and stable leaching liquid flow for subsequent processes, and ensures the continuous and normal operation of production. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic diagram of the control system of the present application;

[0035] Figure 2 is a process flow diagram of the control method of the present application.

[0036] In the figure: 1, acid dissolution tank; 2, clean water tank; 3, leaching liquid storage tank; 4, acid liquid storage tank; 5, liquid passing three-way valve; 6, leaching liquid regulating valve; 7, leaching liquid flowmeter; 8, cleaning liquid collection valve; 9, cleaning liquid discharge valve; 11, acid dissolution tank liquid outlet pump; 12, acid liquid supply valve; 21, clean water pump; 22, clean water valve; 31, leaching liquid pump; 32, leaching liquid valve; 41, acid liquid storage tank liquid outlet pump; 42, acid liquid circulation valve; 43, acid liquid storage tank liquid level meter; 44, acid liquid storage tank blowdown valve; 45, online pH value detection device. DETAILED DESCRIPTION

[0037] The following implementation examples are given to more specifically explain the present application, and it is necessary to point out that the following implementation examples cannot be understood as limiting the protection scope of the present application, and some non-essential improvements and adjustments made by the skilled person in the art to the present application according to the above content of the present application should still belong to the protection scope of the present application. EMBODIMENT

[0038] A papermaking method reconstituted tobacco leaching liquid flowmeter anti-blocking control system, as Figure 1As shown, including acid dissolution tank 1, clean water tank 2, leaching liquid storage tank 3, acid liquid storage tank 4 and over liquid three-way valve 5, the inlet of over liquid three-way valve 5 and liquid supply pipeline are connected, the liquid supply pipeline is provided with leaching liquid flow meter 7 and leaching liquid regulating valve 6, and leaching liquid flow meter 7 and leaching liquid regulating valve 6 are interlocked control, the outlet of acid dissolution tank 1 is communicated through pipeline and acid dissolution tank outlet pump 11, acid liquid supply valve 12 and liquid supply pipeline before leaching liquid flow meter 7 provided on the pipeline, the outlet of clean water tank 2 is communicated through pipeline and clean water pump 21, clean water valve 22 and liquid supply pipeline before leaching liquid flow meter 7 provided on the pipeline, the outlet of leaching liquid storage tank 3 is communicated through pipeline and leaching liquid pump 31, leaching liquid valve 31 and liquid supply pipeline before leaching liquid flow meter 7 provided on the pipeline, the outlet of acid liquid storage tank 4 is provided with two pipelines in parallel, one pipeline is provided with acid dissolution tank outlet pump 41 and acid liquid circulating valve 42 and is communicated with liquid supply pipeline before leaching liquid flow meter 7, the other pipeline is provided with acid liquid storage tank blowdown valve 44 and online pH value detection device 45 and is communicated with blowdown pipeline, the first outlet of over liquid three-way valve 5 is communicated with leaching liquid purification process pipeline, the second outlet of over liquid three-way valve 5 is connected with the inlet of acid liquid storage tank 4 through pipeline and cleaning liquid collection valve 8 provided on the pipeline, the pipeline between the second outlet of over liquid three-way valve 5 and the inlet of acid liquid storage tank 4 is branched and provided with blowdown pipeline, and cleaning liquid discharge valve 9 is arranged on the blowdown pipeline.

[0039] Mechanical stirring devices are arranged in the acid dissolution tank 1, clean water tank 2, leaching liquid storage tank 3 and acid liquid storage tank 4, and liquid level meter 43 of the acid liquid storage tank 4 is further arranged.

[0040] A kind of papermaking method reconstituted tobacco leaching liquid flow meter anti-blocking control method, such as Figure 2 As shown, specifically includes:

[0041] Real-time monitoring of leaching liquid flow meter 7 liquid supply pipeline on the leaching liquid pump 31 current value X and leaching liquid regulating valve 6 opening value Y;

[0042] (1) when the leaching liquid pump 31 current value X=0A, start first level prevention control mode, specifically includes:

[0043] S11, trigger over liquid three-way valve 5 switching valve, the over liquid three-way valve 5 is pneumatic three-way L type switch valve, make leaching liquid flow meter 7 and its before and after pipeline and leaching liquid purification process pipeline communication, trigger cleaning liquid collection valve 8 to close, then trigger cleaning liquid discharge valve 9, clean water valve 22, clean water pump 21 in turn open;

[0044] S12, the clean water pump 21 pumps clean water to leaching liquid flow meter 7, the clean water is medium pressure water, the pressure is (6~8) bar, the temperature is (15~25) ℃, the flow is (20~25) m 3 / h; the leaching solution flow meter 7, the leaching solution regulating valve 6 and the liquid supply and discharge pipelines thereof are flushed with clean water, the flushing water flows into the ditch through the cleaning liquid discharge valve 9 and is discharged to the sewage treatment, the clean water flushing time is (3-5) min, and the leaching solution pump 31 cannot be started and operated before the clean water flushing reaches the set time;

[0045] S13, after the completion of the clean water flushing operation, the clean water pump 21, the clean water valve 22 and the cleaning liquid discharge valve 9 are sequentially triggered to be closed, the over-liquid three-way valve 5 is triggered to switch the valve position, the leaching solution flow meter 7 and the pipelines before and after the same are communicated with the leaching solution purification process pipeline, the leaching solution pump 31 meets the starting condition, and the first level of prevention and control is completed.

[0046] (2) when the leaching solution pump 31 current value X = 0 A and the leaching solution regulating valve 6 opening value Y is greater than or equal to 2 times the normal opening value Z of the leaching solution regulating valve 6 or the leaching solution pump 31 current value X ≠ 0 A and the leaching solution regulating valve 6 opening value Y is greater than or equal to 2 times the normal opening value Z of the leaching solution regulating valve 6, the normal opening value Z of the leaching solution regulating valve 6 is (30-40) %, the instantaneous flow value Q of the flow meter and the opening value Y of the leaching solution regulating valve 6 are monitored in real time, and the timing is started, and after 15 min, when the flow meter instantaneous flow is (Q ± 1) m 3 / h and the opening of the leaching solution regulating valve 6 is Y ± 5 %, the two conditions are met at the same time, the second level of prevention and control mode is started, and specifically includes:

[0047] S21, the leaching solution pump 31 is triggered to stop running, the over-liquid three-way valve 5 is triggered to switch the valve position, the leaching solution flow meter 7 and the pipelines before and after the same are communicated with the leaching solution purification process pipeline, the cleaning liquid discharge valve 9 is triggered to be closed, and then the cleaning liquid collection valve 8, the acid liquid supply valve 12 and the acid dissolution tank discharge pump 11 are sequentially triggered to be opened;

[0048] S22, the acid dissolution tank discharge pump 11 pumps the acid liquid to the leaching solution flow meter 7, the leaching solution flow meter 7, the leaching solution regulating valve 6 and the liquid supply and discharge pipelines thereof are cleaned with the acid liquid, the cleaning acid liquid is collected to the acid liquid storage tank 4 through the cleaning liquid collection valve 8, specifically, the acid liquid in the acid liquid storage tank 4 is one of nitric acid or sulfamic acid solution, the concentration is (10-15) wt %, the temperature is 80 °C, and the flow is (15-20) m 3 / h;

[0049] S23, when the liquid level of the acid liquid storage tank 4 reaches 50 %, the acid dissolution tank discharge pump 11 and the acid liquid supply valve 12 are triggered to be closed, the acid liquid circulating valve 42 and the acid liquid storage tank discharge pump 41 are triggered to be opened, and the acid liquid is circulated and cleaned between the leaching solution flow meter 7, the leaching solution regulating valve 6 and the acid liquid storage tank 4, the cleaning time is (45-60) min, and the leaching solution pump 31 cannot be started and operated before the set time is reached;

[0050] S24, after the acid liquid cleaning operation is completed, the acid liquid is collected to the acid liquid storage tank 4, the acid liquid storage tank outlet pump 41 is triggered to be closed, the acid liquid storage tank blowdown valve 44 is triggered to be opened, and the acid liquid is discharged to the sewage treatment;

[0051] S25, when the liquid level of the acid liquid storage tank 4 is less than or equal to 5%, the acid liquid storage tank blowdown valve 44 is triggered to be closed, the clean water valve 22, the clean water pump 21 and the acid liquid storage tank outlet pump 41 are triggered to be opened, and the clean water is used to circularly flush the leaching liquid flow meter 7, the leaching liquid regulating valve 6 and the acid liquid storage tank 4. The cleaning time is (5-10) min.

[0052] S26, after the circular clean water flushing is completed, the acid liquid circulating valve 42 and the acid liquid storage tank outlet pump 41 are triggered to be closed, and the acid liquid storage tank blowdown valve 44 is triggered to be opened. An on-line pH value detection device 45 is arranged on the outlet pipeline of the acid liquid storage tank blowdown valve 44, and the pH value of the water outlet of the blowdown valve is kept at 7.0±0.5.

[0053] S27, when the pH value of the water outlet of the acid liquid storage tank blowdown valve 44 reaches 7.0±0.5, the clean water pump 21, the clean water valve 22, the cleaning liquid collecting valve 8 and the acid liquid storage tank blowdown valve 44 are sequentially triggered to be closed, and the circular acid liquid cleaning operation is completed. The switching valve position of the overflow three-way valve 5 is triggered to be switched, so that the leaching liquid flow meter 7 and the pipelines before and after the leaching liquid flow meter 7 are connected with the leaching liquid purification process pipeline, the leaching liquid pump 31 meets the starting condition, and the secondary prevention control is completed.

[0054] In the embodiment, the leaching liquid flow meter 7 is an electromagnetic flow meter or a mass flow meter. The leaching liquid flow meter 7 is provided with two metering channels. When the flow meter executes the cleaning operation, the flow meter is switched to the cleaning water metering channel. The flow meter display screen meters the instantaneous flow and the cumulative flow of the cleaning water. After the cleaning operation is completed, the flow meter is switched to the leaching liquid metering channel. The flow meter display screen meters the instantaneous flow and the cumulative flow of the leaching liquid. This is convenient for accurately collecting and calculating the data such as the leaching liquid output and the conveying capacity in the actual production process.

[0055] Comparative example

[0056] The leaching liquid in the leaching liquid storage tank 3 flows through the leaching liquid pump 31 and the leaching liquid valve 32 on the leaching liquid conveying pipeline, flows through the leaching liquid flow meter 7 (which is recorded as 1# leaching liquid flow meter at this time), flows into the leaching liquid purification process through the leaching liquid regulating valve 6.

[0057] The interface display flow and the actual flow of the leaching liquid flow meter (which is recorded as 2# leaching liquid flow meter at this time) in the embodiment and the 1# leaching liquid flow meter in the comparative example which are simultaneously put into the production line are compared and verified respectively. The actual flow verification method is as follows: 30mL of leaching liquid is selected and the liquid level and the volume are calibrated in advance. The leaching liquid is poured into the leaching liquid flow meter. The actual flow of the leaching liquid is calculated according to the volume of the leaching liquid and the density of the leaching liquid. 3The actual flow of the leaching liquid storage tank is calculated by the amount of leaching liquid flowing into the leaching liquid storage tank through the 1# and 2# leaching liquid flow meters within a certain time. The 1# leaching liquid flow meter does not use the anti-clogging control method of the application, and the 2# leaching liquid flow meter uses the anti-clogging control method of the application. The specific results are shown in Table 1.

[0058] Table 1 Comparison of interface display flow and actual flow of 1# and 2# leaching liquid flow meters

[0059]

[0060] The comparison results show that the actual flow and the interface display flow of the 1# leaching liquid flow meter without using the anti-clogging control method of the application are 24.95 m 3 / h and 27.17 m 3 / h, respectively, with a deviation of 8.17%; the actual flow and the interface display flow of the 2# leaching liquid flow meter using the anti-clogging control method of the application are 20.03 m 3 / h and 20.26 m 3 / h, respectively, with a deviation of 1.14%, and the flow meter is more accurate in measurement, eliminating the problem of measurement deviation caused by clogging of the flow meter due to dirt retention, and ensuring continuous normal operation of production.

[0061] The application sets a first prevention control mode and a second prevention control mode. The first prevention control mode is mainly to use medium-pressure clean water to flush the measurement pipe, the leaching liquid regulating valve and the liquid supply and discharge pipeline of the leaching liquid flow meter when the leaching liquid flow meter stops measuring the leaching liquid. The second prevention control mode is mainly to monitor the opening value of the leaching liquid regulating valve and determine the working state of the flow meter by the opening value. When the opening value reaches or exceeds twice the normal operating opening value, long-term acid circulation cleaning is performed on the measurement pipe, the leaching liquid regulating valve and the liquid supply and discharge pipeline of the leaching liquid flow meter using acid, which realizes timely cleaning of the dirt remaining on the inner wall of the measurement pipe of the leaching liquid flow meter, avoids the formation of a thick and difficult-to-clean scale layer due to long retention time of the dirt, effectively prevents clogging of the flow meter, and solves the problems of high labor intensity and long time consumption of manual disassembly, offline cleaning and installation and resetting of the existing leaching liquid flow meter, thereby providing effective and stable leaching liquid flow for subsequent processes and ensuring continuous normal operation of production.

Claims

1. A papermaking process reconstituted tobacco extract flowmeter anti-clogging control system comprising an acid dissolving tank, a clean water tank, an extract storage tank, an acid liquid storage tank, and a liquid passing tee valve, characterized in that, The inlet of the liquid-passing three-way valve is connected with a liquid supply pipeline, and a leaching liquid flow meter and a leaching liquid regulating valve are arranged on the liquid supply pipeline and are interlocked controlled; The outlet of the acid dissolving tank is connected with a pipeline, an acid dissolving tank outlet pump, an acid liquid supply valve and a liquid supply pipeline before a leaching liquid flow meter through the pipeline, the outlet of the clean water tank is connected with a pipeline, a clean water pump, a clean water valve and the liquid supply pipeline before the leaching liquid flow meter through the pipeline, and the outlet of the leaching liquid storage tank is connected with a pipeline, a leaching liquid pump, a leaching liquid valve and the liquid supply pipeline before the leaching liquid flow meter through the pipeline; The first outlet of the liquid-passing three-way valve is connected with a leaching liquid purification process pipeline, the second outlet of the liquid-passing three-way valve is connected with an acid liquid storage tank through a pipeline and a cleaning liquid collecting valve arranged on the pipeline, a branch pipeline is arranged on the pipeline between the second outlet of the liquid-passing three-way valve and the inlet of the acid liquid storage tank, and a pollution discharge pipeline is arranged on the branch pipeline and is provided with a cleaning liquid discharge valve; The outlet of the acid liquid storage tank is connected with two pipelines in parallel, an acid dissolving tank outlet pump and an acid liquid circulating pump are arranged on one pipeline and are connected with the liquid supply pipeline before the leaching liquid flow meter, and an acid liquid storage tank pollution discharge valve and an online pH value detection device are arranged on the other pipeline and are connected with the pollution discharge pipeline; The paper-making method for reconstituted tobacco leaf leaching liquid flow meter anti-blocking control method using the system comprises the following steps: When the leaching liquid pump current value X=0A, a first level prevention control mode is started; When the leaching liquid pump current value X = 0 A and the leaching liquid regulating valve opening value Y is greater than or equal to 2 times the normal opening value Z of the leaching liquid regulating valve, or the leaching liquid pump current value X ≠ 0 A and the leaching liquid regulating valve opening value Y is greater than or equal to 2 times the normal opening value Z of the leaching liquid regulating valve, the instantaneous flow value Q of the leaching liquid flow meter and the leaching liquid regulating valve opening value Y are monitored in real time, and the timing is started. After 15 minutes, when the leaching liquid flow meter instantaneous flow is (Q ± 1) m 3 / h, and the leaching liquid regulating valve opening is Y ± 5%, the secondary prevention control mode is started. The first level prevention control mode specifically comprises the following steps: S11, triggering the liquid-passing three-way valve to switch the valve position, connecting the leaching liquid flow meter and the pipelines before and after the leaching liquid flow meter with the leaching liquid purification process pipeline, triggering the cleaning liquid collecting valve to be closed, and then triggering the cleaning liquid discharge valve, the clean water valve and the clean water pump to be opened in sequence; S12, the clean water pump pumps clean water to the leaching liquid flow meter, and the clean water flushes the leaching liquid flow meter, the leaching liquid regulating valve and the liquid supply and outlet pipelines, and the flushing water flows into a ditch through the cleaning liquid discharge valve and is discharged to a sewage treatment plant; S13, after the clean water flushing operation is completed, the clean water pump, the cleaning liquid supply valve and the cleaning liquid discharge valve are triggered to be closed in sequence, the liquid-passing three-way valve is triggered to switch the valve position, the leaching liquid flow meter and the pipelines before and after the leaching liquid flow meter are connected with the leaching liquid purification process pipeline, the leaching liquid pump meets the starting condition, and the first level prevention control is completed; The second level prevention control mode specifically comprises the following steps: S21, triggering the leaching liquid pump to stop running, triggering the liquid-passing three-way valve to switch the valve position, connecting the leaching liquid flow meter and the pipelines before and after the leaching liquid flow meter with the leaching liquid purification process pipeline, triggering the cleaning liquid discharge valve to be closed, and then triggering the cleaning liquid collecting valve, the acid liquid supply valve and the acid dissolving tank outlet pump to be opened in sequence; S22, the acid dissolving tank outlet pump pumps acid liquid to the leaching liquid flow meter, and the acid liquid flushes the leaching liquid flow meter, the leaching liquid regulating valve and the liquid supply and outlet pipelines, and the flushing acid liquid is collected to the acid liquid storage tank through the cleaning liquid collecting valve. S23, when the liquid level of the acid liquid storage tank reaches 50%, trigger the acid dissolution tank outlet pump and the acid liquid supply valve to close, trigger the acid liquid circulating valve and the acid liquid storage tank outlet pump to open, and perform circulating acid liquid cleaning between the leaching liquid flow meter, the leaching liquid regulating valve and the acid liquid storage tank; S24, after the acid liquid cleaning operation is completed, the acid liquid is collected to the acid liquid storage tank, the acid liquid storage tank outlet pump is triggered to close, the acid liquid storage tank blowdown valve is triggered to open, and the acid liquid is discharged to the sewage treatment; S25, when the liquid level of the acid liquid storage tank is less than or equal to 5%, trigger the acid liquid storage tank blowdown valve to close, trigger the clean water valve, the clean water pump and the acid liquid storage tank outlet pump to open, and perform circulating clean water flushing on the leaching liquid flow meter, the leaching liquid regulating valve and the acid liquid storage tank; S26, after the circulating clean water flushing is completed, trigger the acid liquid circulating valve and the acid liquid storage tank outlet pump to close, trigger the acid liquid storage tank blowdown valve to open, and keep the pH value of the outlet water of the blowdown valve at 7.0±0.5; S27, when the pH value of the outlet water of the blowdown valve reaches 7.0±0.5, trigger the clean water pump, the clean water valve, the cleaning liquid collection valve and the acid liquid storage tank blowdown valve to close in sequence, complete the circulating acid liquid cleaning operation, trigger the over liquid three-way valve switching valve position, so that the leaching liquid flow meter and the pipelines before and after it are connected with the leaching liquid purification process pipeline, and the leaching liquid pump meets the starting condition, and the secondary prevention control is completed.

2. The control system of claim 1, wherein, Mechanical stirring devices are arranged in the acid dissolution tank, the clean water tank, the leaching liquid storage tank and the acid liquid storage tank, and an acid liquid storage tank liquid level meter is further arranged on the acid liquid storage tank.

3. The method of preventing clogging of a flow meter for a paper process reconstituted tobacco extract according to claim 1, wherein It comprises: Real-time monitoring of the leaching liquid pump current value X and the leaching liquid regulating valve opening value Y on the leaching liquid flow meter supply pipeline; When the leaching liquid pump current value X=0A, start the primary prevention control mode; When the leaching liquid pump current value X = 0 A and the leaching liquid regulating valve opening value Y is greater than or equal to 2 times the normal opening value Z of the leaching liquid regulating valve, or the leaching liquid pump current value X ≠ 0 A and the leaching liquid regulating valve opening value Y is greater than or equal to 2 times the normal opening value Z of the leaching liquid regulating valve, the instantaneous flow value Q of the leaching liquid flow meter and the leaching liquid regulating valve opening value Y are monitored in real time, and the timing is started. After 15 minutes, when the leaching liquid flow meter instantaneous flow is (Q ± 1) m 3 / h, and the leaching liquid regulating valve opening is Y ± 5%, the secondary prevention control mode is started. The primary prevention control mode comprises: S11, trigger the over liquid three-way valve switching valve position, so that the leaching liquid flow meter and the pipelines before and after it are connected with the leaching liquid purification process pipeline, trigger the cleaning liquid collection valve to close, and then trigger the cleaning liquid discharge valve, the clean water valve and the clean water pump to open in sequence; S12, the clean water pump pumps clean water to the leaching liquid flow meter, and performs clean water flushing on the leaching liquid flow meter, the leaching liquid regulating valve and the supply and outlet pipelines thereof, and the flushing water flows into the ditch through the cleaning liquid discharge valve and is discharged to the sewage treatment; S13, after the clean water flushing operation is completed, trigger the clean water pump, the cleaning supply valve and the cleaning liquid discharge valve to close in sequence, trigger the over liquid three-way valve switching valve position, so that the leaching liquid flow meter and the pipelines before and after it are connected with the leaching liquid purification process pipeline, and the leaching liquid pump meets the starting condition, and the primary prevention control is completed; The secondary prevention control mode comprises: S21, trigger the leaching liquid pump to stop running, trigger the over liquid three-way valve switching valve position, so that the leaching liquid flow meter and the pipelines before and after it are connected with the leaching liquid purification process pipeline, trigger the cleaning liquid discharge valve to close, and then trigger the cleaning liquid collection valve, the acid liquid supply valve and the acid dissolution tank outlet pump to open in sequence; S22, the acid dissolution tank outlet pump pumps acid liquid to the leaching liquid flow meter, and performs acid liquid cleaning on the leaching liquid flow meter, the leaching liquid regulating valve and the supply and outlet pipelines thereof, and the cleaning acid liquid is collected to the acid liquid storage tank through the cleaning liquid collection valve; S23, when the liquid level of the acid storage tank reaches 50%, trigger the acid dissolution tank outlet pump and the acid liquid supply valve to close, trigger the acid liquid circulating valve and the acid liquid storage tank outlet pump to open, and perform circulating acid cleaning between the leaching liquid flow meter, the leaching liquid regulating valve and the acid storage tank; S24, after the acid cleaning operation is completed, the acid is collected to the acid storage tank, the acid storage tank outlet pump is triggered to close, the acid storage tank blowdown valve is triggered to open, and the acid is discharged to the sewage treatment; S25, when the liquid level of the acid storage tank is ≤5%, trigger the acid storage tank blowdown valve to close, trigger the clean water valve, the clean water pump and the acid storage tank outlet pump to open, and use clean water to perform circulating clean water flushing on the leaching liquid flow meter, the leaching liquid regulating valve and the acid storage tank; S26, after the circulating clean water flushing is completed, trigger the acid liquid circulating valve and the acid storage tank outlet pump to close, trigger the acid storage tank blowdown valve to open, until the pH value of the blowdown valve outlet water reaches 7.0±0.5; S27, when the pH value of the blowdown valve outlet water reaches 7.0±0.5, trigger the clean water pump, the clean water valve, the cleaning liquid collection valve and the acid storage tank blowdown valve to close in sequence, complete the circulating acid cleaning operation, trigger the liquid overflow three-way valve switching valve position, so that the leaching liquid flow meter and the pipelines before and after it are connected with the leaching liquid purification process pipeline, and the leaching liquid pump meets the starting condition, and the secondary prevention control is completed.

4. The paper process reconstituted tobacco leaf extract flowmeter anti-clogging control method according to claim 3, characterized in that, The liquid-passing three-way valve in S11 is a pneumatic three-way L-shaped switch valve; the clean water in S12 is medium-pressure water, with a pressure of (6-8) bar, a temperature of (15-25) °C, and a flow of (20-25) m 3 / h; the clean water flushing time is (3-5) min, and the leaching liquid pump cannot start running before the clean water flushing reaches the set time.

5. The paper process reconstituted tobacco leaf extract flowmeter anti-clogging control method according to claim 3, characterized in that, The normal opening value Z of the leaching liquid regulating valve is (30-40)%.

6. The paper process reconstituted tobacco leaf extract flowmeter anti-clogging control method according to claim 3, characterized in that, The acid liquid in S22 is one of nitric acid or aminosulfonic acid solution, with a concentration of (10-15) wt%, a temperature of 80℃, and a flow rate of (15-20) m 3 / h.

7. The paper process reconstituted tobacco leaf extract flow meter clogging prevention control method according to claim 3, characterized by, In S23, the circulating acid cleaning time is (45-60) min, and the leaching liquid pump cannot start running before the circulating acid cleaning reaches the set time.

8. The paper process reconstituted tobacco leaf extract flow meter clogging prevention control method according to claim 3, characterized by, In S25, the circulating clean water flushing time is (5-10) min.

9. The paper process reconstituted tobacco leaf infusion flow meter anti-clog control system of claim 1 wherein, The leaching liquid flow meter is an electromagnetic flow meter or a mass flow meter.

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