Automatic and safe interlocking device and method for taking out and separating ammonium chloride

Abstract

The invention discloses an automatic and safe interlocking device and method for taking out and separating ammonium chloride. The device comprises a cold extraction pipe densitometer bypass and flushing device, a first extraction pipe outlet pneumatic valve, a mixed thickener liquid outlet pipe densitometer bypass and flushing device, a second extraction pipe outlet pneumatic valve, a salting-out extraction pipe densitometer bypass and flushing device and a third extraction pipe outlet pneumatic valve, the device comprises a salting-out thickener liquid outlet pipe densimeter bypass and flushing device, a first current sensor, a second current sensor, a third current sensor and a fourth current sensor. According to the invention, automatic adjustment and control from crystal extraction to separation can be realized, the combined-soda refined operation level is improved, the ammonium chloride yield is improved, the automation degree is improved, the labor intensity of workers is reduced, and continuous and stable production is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of chemical automation production, and in particular to an automated ammonium chloride removal and separation and safety interlocking device and method. Background Art

[0002] At present, the automation level of combined alkali production is low, and the process of removing ammonium chloride slurry from thickening to separation has not been automated. Therefore, there are the following disadvantages: ① Manual measurement of the solid-liquid ratio has large errors, which is not conducive to refined production operations; ② Manual measurement of the solid-liquid ratio and adjustment of production have lags, such as comprehensive monitoring and timely adjustment of automated production, which is not conducive to refined production; ③ Manual operation has high labor intensity and is not friendly to employees; ④ The removal process has many moving equipment and a large output (130t / h), which is prone to failures. Manual operation is difficult to deal with in time, which can easily cause fluctuations in production. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic and safety interlocking device and method for taking out and separating ammonium chloride, so as to realize automatic adjustment and control from crystal taking out to separation, and trigger the interlocking protection when a sudden failure occurs in a production device, so as to ensure continuous and stable operation of production.

[0004] The present invention adopts the following technical scheme: an automatic and safety interlocking device for removing and separating ammonium chloride, comprising:

[0005] A bypass and flushing device for the density meter of the cold extraction tube, a pneumatic valve at the outlet of the first extraction tube, a bypass and flushing device for the density meter of the liquid outlet tube of the mixing thickener, a pneumatic valve at the outlet of the second extraction tube, a bypass and flushing device for the density meter of the salting out tube, a pneumatic valve at the outlet of the third extraction tube, a bypass and flushing device for the density meter of the liquid outlet tube of the salting out thickener, a first current sensor, a second current sensor, a third current sensor and a fourth current sensor.

[0006] Among them, the bypass and flushing device of the cold precipitation withdrawal tube density meter includes the cold precipitation withdrawal tube density meter, the first bypass and the first steam blowing and plugging pipeline; the bypass and flushing device of the mixing thickener liquid outlet tube density meter includes the mixing thickener liquid outlet tube density meter, the second bypass and the second steam blowing and plugging pipeline; the bypass and flushing device of the salting out withdrawal tube density meter includes the salting out withdrawal tube density meter, the third bypass and the third steam blowing and plugging pipeline; the bypass and flushing device of the salting out thickener liquid outlet tube density meter includes the salting out thickener liquid outlet tube density meter, the fourth bypass and the fourth steam blowing and plugging pipeline.

[0007] A first pneumatic valve is provided at the outlet of the cold extraction pipe, a second pneumatic valve is provided on the centrifuge inlet pipeline, a third pneumatic valve is provided at the outlet of the salting-out extraction pipe, a first current sensor is provided on the mixing thickener motor, a second current sensor is provided on the centrifuge motor, a third current sensor is provided on the wet ammonium belt conveyor motor, and a fourth current sensor is provided on the salting-out thickener motor.

[0008] Furthermore, a cold precipitation removal tube density meter is arranged behind the root valve of the cold precipitation crystallizer removal tube through a first bypass, a first cut-off valve is installed at the front end of the cold precipitation removal tube density meter, and a second cut-off valve is installed at the rear end of the cold precipitation removal tube density meter. One end of the first steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the first steam blowing and plugging pipeline is connected to the inlet pipe of the cold precipitation removal tube density meter.

[0009] The density meter of the liquid outlet pipe of the mixer and thickener is arranged behind the root valve of the liquid outlet pipe of the mixer and thickener through the second bypass, the third cut-off valve is installed at the front end of the density meter of the liquid outlet pipe of the mixer and thickener, and the fourth cut-off valve is installed at the rear end of the density meter of the liquid outlet pipe of the mixer and thickener, one end of the second steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the second steam blowing and plugging pipeline is connected to the inlet pipe of the density meter of the liquid outlet pipe of the mixer and thickener.

[0010] The salting out tube density meter is arranged behind the root valve of the salting out crystallizer tube through the third bypass, the fifth cut-off valve is installed at the front end of the salting out tube density meter, the sixth cut-off valve is installed at the rear end of the salting out tube density meter, one end of the third steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the third steam blowing and plugging pipeline is connected to the inlet pipe of the salting out tube density meter.

[0011] The density meter of the liquid outlet pipe of the salting out thickener is arranged behind the root valve of the outlet pipe of the salting out thickener through the fourth bypass, the seventh cut-off valve is installed at the front end of the density meter of the liquid outlet pipe of the salting out thickener, and the eighth cut-off valve is installed at the rear end of the density meter of the liquid outlet pipe of the salting out thickener. One end of the fourth steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the fourth steam blowing and plugging pipeline is connected to the inlet pipe of the density meter of the liquid outlet pipe of the salting out thickener.

[0012] Furthermore, the present invention also proposes a method for automating the separation and safety interlocking of ammonium chloride extraction, including control from cold precipitation extraction to wet ammonium discharge and control from salting out extraction to reverse feed cold precipitation.

[0013] The control from cold precipitation to wet ammonium discharge includes:

[0014] Step 1: Measure the density of the clear liquid of the cold-precipitated liquid and the density of the cold-precipitated liquid at a solid-liquid ratio of 20% to 60%, use a mathematical model to obtain the functional relationship between the cold-precipitated solid-liquid ratio and the density, and determine the solid-liquid ratio by measuring the density of the extracted liquid.

[0015] Step 2: Measure the solid-liquid ratio of the cold separation extraction through the cold separation extraction tube density meter bypass and flushing device, set the target value range of the solid-liquid ratio of the cold separation extraction, when the measured solid-liquid ratio of the cold separation extraction is lower than the minimum value of the target value range, adjust the pneumatic valve at the outlet of the first extraction tube down, when the measured solid-liquid ratio of the cold separation extraction is higher than the maximum value of the target value range, adjust the pneumatic valve at the outlet of the first extraction tube up.

[0016] Step 3, measure the liquid-to-solid ratio of the mixer and thickener through the bypass and flushing device of the mixer and thickener outlet pipe density meter, set the target value range of the solid-liquid ratio, when the measured liquid-to-solid ratio of the mixer and thickener is lower than the minimum value of the target value range, increase the pneumatic valve of the cold separation extraction pipe with the largest solid-liquid ratio, if the cold separation extraction solid-liquid ratios are all less than the first threshold value, reduce the pneumatic valves at the outlets of all the second extraction pipes, if the maximum value of the cold separation extraction solid-liquid ratio is not less than the first threshold value, increase the pneumatic valve at the outlet of the first extraction pipe corresponding to the maximum cold separation extraction solid-liquid ratio.

[0017] When the measured liquid-to-solid ratio of the mixing thickener is higher than the maximum value of the target value range, if the minimum solid-liquid ratio of the cold separation is not greater than the second threshold value, the pneumatic valve at the outlet of the first extraction pipe corresponding to the minimum solid-liquid ratio of the cold separation is adjusted down; if the solid-liquid ratios of the cold separation are all greater than the second threshold value, an alarm is issued.

[0018] The control from salting out to reverse feeding and cold precipitation includes:

[0019] Step 1: Measure the density of the clear liquid of the salting-out solution and the density of the salting-out solution at a solid-liquid ratio of 20% to 60%, use a mathematical model to obtain the functional relationship between the salting-out solid-liquid ratio and the density, and determine the solid-liquid ratio by measuring the density of the solution.

[0020] Step 2: Measure the solid-liquid ratio of the salting-out crystallizer through the salting-out extraction tube density meter bypass and flushing device, set the target value range of the solid-liquid ratio, and when the measured solid-liquid ratio of the salting-out crystallizer is lower than the minimum value of the target value range, reduce the pneumatic valve at the outlet of the third extraction tube; when the measured solid-liquid ratio of the salting-out crystallizer is higher than the maximum value of the target value range, increase the pneumatic valve at the outlet of the third extraction tube.

[0021] Step 3, measure the solid-liquid ratio of the salting-out thickener through the salting-out thickener outlet pipe density meter bypass and flushing device, set the target value range of the solid-liquid ratio, when the measured solid-liquid ratio of the salting-out thickener is lower than the minimum value of the target value range, if the maximum value of the solid-liquid ratio of the salting-out crystallizer is greater than the third threshold value, increase the pneumatic valve at the outlet of the third extraction pipe, if the solid-liquid ratio of the salting-out crystallizer is less than the third threshold value, an alarm is issued; when the measured solid-liquid ratio of the salting-out thickener is higher than the maximum value of the target value range, if the minimum value of the solid-liquid ratio of the salting-out crystallizer is less than the fourth threshold value, decrease the pneumatic valve at the outlet of the extraction pipe corresponding to the solid-liquid ratio, if the solid-liquid ratio of the salting-out crystallizer is higher than the fourth threshold value, an alarm is issued.

[0022] Furthermore, the functional relationship between the solid-liquid ratio and density of cold precipitation and salting out is:

[0023] ρ=ρ 0 +0.0016*V;

[0024] Where, ρ represents the density of the test liquid, ρ 0 It represents the density of the clear liquid taken out of the test liquid, and V represents the volume occupied by the solid and liquid in the test liquid.

[0025] Furthermore, during the cold precipitation and wet ammonium discharge control, the target value range of the solid-liquid ratio during the cold precipitation is 40-45%.

[0026] Reduce the pneumatic valve at the outlet of the first extraction pipe by 5%.

[0027] Increase the pneumatic valve at the outlet of the first extraction pipe by 5%.

[0028] The target value range of the liquid-to-solid ratio taken out of the mixer thickener is 70-75%.

[0029] The first threshold is 42%.

[0030] Increase the pneumatic valve at the outlet of the first extraction pipe corresponding to the maximum solid-liquid ratio of cold separation by 5%.

[0031] The second threshold is 43%.

[0032] Reduce the pneumatic valve at the outlet of the first extraction pipe corresponding to the minimum solid-liquid ratio of cold separation by 5%.

[0033] Furthermore, the target value range of the solid-liquid ratio of the salting-out crystallizer is 30-35% when the salting-out is taken out and fed into the reverse feed cold precipitation control.

[0034] Reduce the pneumatic valve at the outlet of the third extraction pipe by 5%.

[0035] Increase the outlet pneumatic valve of the third extraction pipe by 5%.

[0036] The target value range of the solid-to-liquid ratio of the salting-out thickener is 55-60%.

[0037] The third threshold is 32%.

[0038] Increase the outlet pneumatic valve of the third extraction pipe by 5%.

[0039] The fourth threshold is 33%.

[0040] Reduce the pneumatic valve at the outlet of the take-out pipe corresponding to the minimum solid-liquid ratio of the salting-out crystallizer by 5%.

[0041] Furthermore, the density meter is steam purged every 8 hours by steam blowing the plugged pipeline.

[0042] Furthermore, setting up the chain protection procedure includes the following:

[0043] 1. The belt conveyor motor is interlocked with the pneumatic valve at the outlet of the second take-out pipe and the pneumatic valve at the outlet of the first take-out pipe.

[0044] 2. The centrifuge motor is interlocked with the pneumatic valve at the outlet of the second extraction pipe.

[0045] 3. The motor of the mixer and thickener is interlocked with the pneumatic valve at the outlet of the first extraction pipe.

[0046] 4. The salting-out thickener motor is interlocked with the pneumatic valve at the outlet of the third extraction pipe.

[0047] Furthermore, the present invention also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for automating the removal and separation of ammonium chloride and the safety interlocking device when executing the computer program.

[0048] Furthermore, the present invention also proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is run by a processor, the method of the ammonium chloride removal and separation automation and safety interlocking device is executed.

[0049] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0050] 1. The present invention can realize automatic adjustment and control from crystallization taking out to separation, improve the level of fine operation of combined alkali, increase the output of ammonium chloride, improve the degree of automation, and reduce the labor intensity of employees.

[0051] 2. When a production device suddenly fails, the present invention can trigger a chain protection to reduce the scope of the failure, gain time for fault handling, and ensure continuous and stable production operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is the overall process flow chart of the present invention.

[0053] Figure 2 It is the control logic diagram of cold separation and extraction of the present invention.

[0054] Figure 3 It is the salting out control logic diagram of the present invention. DETAILED DESCRIPTION

[0055] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0056] To achieve the above object, the present invention provides an automatic and safe interlocking device for removing and separating ammonium chloride, such as Figure 1 As shown, it includes a bypass and flushing device for the cold extraction tube density meter ①, a first extraction tube outlet pneumatic valve ②, a bypass and flushing device for the mixing thickener outlet tube density meter ③, a second extraction tube outlet pneumatic valve ④, a bypass and flushing device for the salting out tube density meter ⑤, a third extraction tube outlet pneumatic valve ⑥, a bypass and flushing device for the salting out thickener outlet tube density meter ⑦, a first current sensor ⑧, a second current sensor ⑨, a third current sensor ⑩ and a fourth current sensor

[0058] Among them, the bypass and flushing device ① of the cold precipitation extraction tube density meter includes the cold precipitation extraction tube density meter, the first bypass and the first steam blowing and plugging pipeline. The bypass and flushing device ③ of the mixing thickener outlet tube density meter includes the mixing thickener outlet tube density meter, the second bypass and the second steam blowing and plugging pipeline. The bypass and flushing device ⑤ of the salting out extraction tube density meter includes the salting out extraction tube density meter, the third bypass and the third steam blowing and plugging pipeline. The bypass and flushing device ⑦ of the salting out thickener outlet tube density meter includes the salting out thickener outlet tube density meter, the fourth bypass and the fourth steam blowing and plugging pipeline.

[0059] The cold precipitation removal tube density meter is arranged behind the root valve of the cold precipitation crystallizer removal tube through the first bypass, the first cut-off valve is installed at the front end of the cold precipitation removal tube density meter, and the second cut-off valve is installed at the rear end of the cold precipitation removal tube density meter. One end of the first steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the first steam blowing and plugging pipeline is connected to the inlet pipe of the cold precipitation removal tube density meter.

[0060] A first outlet pneumatic valve ② is provided at the outlet of the cold separation removal pipe to adjust the flow rate of the cold separation removal pipe.

[0061] The density meter of the liquid outlet pipe of the mixer and thickener is arranged behind the root valve of the liquid outlet pipe of the mixer and thickener through the second bypass, the third cut-off valve is installed at the front end of the density meter of the liquid outlet pipe of the mixer and thickener, and the fourth cut-off valve is installed at the rear end of the density meter of the liquid outlet pipe of the mixer and thickener, one end of the second steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the second steam blowing and plugging pipeline is connected to the inlet pipe of the density meter of the liquid outlet pipe of the mixer and thickener.

[0062] A second extraction pipe outlet pneumatic valve ④ is arranged on the centrifuge inlet pipeline to adjust the feed volume of the centrifuge.

[0063] The salting out tube density meter is arranged behind the root valve of the salting out crystallizer tube through the third bypass, the fifth cut-off valve is installed at the front end of the salting out tube density meter, the sixth cut-off valve is installed at the rear end of the salting out tube density meter, one end of the third steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the third steam blowing and plugging pipeline is connected to the inlet pipe of the salting out tube density meter.

[0064] A third outlet pneumatic valve ⑥ is provided at the outlet of the salting-out pipe to adjust the flow rate of the salting-out pipe.

[0065] The density meter of the liquid outlet pipe of the salting out thickener is arranged behind the root valve of the outlet pipe of the salting out thickener through the fourth bypass, the seventh cut-off valve is installed at the front end of the density meter of the liquid outlet pipe of the salting out thickener, and the eighth cut-off valve is installed at the rear end of the density meter of the liquid outlet pipe of the salting out thickener. One end of the fourth steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the fourth steam blowing and plugging pipeline is connected to the inlet pipe of the density meter of the liquid outlet pipe of the salting out thickener.

[0066] A first current sensor ⑧ is provided on the motor of the mixing thickener to monitor the current. A second current sensor ⑨ is provided on the motor of the centrifuge to monitor the current. A third current sensor ⑩ is provided on the motor of the wet ammonium belt conveyor to monitor the current. A fourth current sensor is provided on the motor of the salting thickener Used to monitor current.

[0067] When in use, an ammonium chloride extraction and separation automation and safety interlocking device can perform two operations, namely, cold separation extraction to wet ammonium discharge control and salting-out extraction to reverse feed cold separation control.

[0068] like Figure 2 As shown, the process from cold precipitation to wet ammonium discharge control is:

[0069] Step 1. Due to different solid-liquid ratios, the solid and liquid contained in the same volume of liquid are different, resulting in different densities of the liquid. As the solid-liquid ratio increases, the density also increases. Therefore, the density of the clear liquid of the cold-precipitated liquid is first measured, and then the density of the cold-precipitated liquid at a solid-liquid ratio of 20% to 60% is measured. The functional relationship between the cold-precipitated solid-liquid ratio and the density is calculated using a mathematical model, and the solid-liquid ratio is accurately derived by measuring the density of the extracted liquid.

[0070] The solid-liquid ratio of cold separation extraction is measured by the cold separation extraction tube density meter bypass and flushing device, and the target value range of the solid-liquid ratio of cold separation extraction is set to 40-45%. When the measured solid-liquid ratio of cold separation extraction is lower than 40%, the pneumatic valve at the outlet of the first extraction tube is automatically adjusted down by 5%. When the measured solid-liquid ratio of cold separation extraction is higher than 45%, the pneumatic valve at the outlet of the first extraction tube is automatically adjusted up by 5%.

[0071] The relationship between the density of the extracted liquid and the solid-liquid ratio is determined by experiments to be ρ = ρ 0 +0.0016*V.

[0072] Where, ρ represents the density of the test liquid, ρ 0 It represents the density of the clear liquid taken out of the test liquid, and V represents the volume occupied by the solid and liquid in the test liquid.

[0073] Step 2: Since the density meter is a precision measuring element, it is usually made smaller (usually not exceeding DN80). In order to measure the density of the liquid in the larger diameter extraction tube, a bypass is installed on the extraction tube, which improves the measurement accuracy and reduces the use cost.

[0074] The liquid-solid-liquid ratio of the mixer and thickener is measured by the bypass and flushing device of the densitometer of the mixer and thickener outlet pipe, and the target value range of the solid-liquid ratio is set to 70-75%. When the measured liquid-solid-liquid ratio of the mixer and thickener outlet pipe is lower than 70%, the thickener outlet inlet pipe is checked, and the pneumatic valve of the cold separation outlet pipe with the largest solid-liquid ratio is increased. If the cold separation outlet solid-liquid ratio is less than 42%, all the pneumatic valves of the second outlet pipe are decreased. If the maximum value of the cold separation outlet solid-liquid ratio is not less than 42%, the pneumatic valve of the first outlet pipe corresponding to the maximum cold separation outlet solid-liquid ratio is increased by 5%.

[0075] When the measured solid-liquid ratio of the mixed thickener is higher than 75%, if the minimum solid-liquid ratio of the cold separation is not greater than 43%, the pneumatic valve at the outlet of the first extraction pipe corresponding to the minimum solid-liquid ratio of the cold separation is adjusted down by 5%. If the solid-liquid ratios of the cold separation are greater than 43%, a reminder is issued to ask the operator to arrange to check whether the centrifuge load can be increased (the increase of the centrifuge load is generally adjusted manually, and automatic adjustment is prone to spraying and loosening).

[0076] like Figure 3 As shown in the figure, the process from salting out to reverse material feeding and cold precipitation control is:

[0077] Step 1, measure the density of the clear liquid of the salting-out liquid, then measure the density of the salting-out liquid at a solid-liquid ratio of 20% to 60%, use a mathematical model to deduce the functional relationship between the salting-out solid-liquid ratio and the density, and accurately deduce the solid-liquid ratio by measuring the density of the extracted liquid.

[0078] The solid-liquid ratio of the salting-out crystallizer is measured by the salting-out extraction tube density meter bypass and flushing device, and the target value range of the solid-liquid ratio is set to 30-35%. When the measured solid-liquid ratio of the salting-out crystallizer is lower than 30%, the pneumatic valve at the outlet of the third extraction tube is reduced by 5%. When the measured solid-liquid ratio of the salting-out crystallizer is higher than 35%, the pneumatic valve at the outlet of the third extraction tube is increased by 5%.

[0079] Step 2, measure the solid-liquid ratio of the salting-out thickener through the salting-out thickener outlet pipe density meter bypass and flushing device, set the target value range of the solid-liquid ratio to 55-60%, when the measured solid-liquid ratio of the salting-out thickener is lower than 55%, if the maximum value of the solid-liquid ratio of the salting-out crystallizer is greater than 32%, increase the pneumatic valve at the outlet of the third withdrawal pipe by 5%, if the solid-liquid ratio of the salting-out crystallizer is less than 32%, issue a reminder and manually adjust the reverse feed pump; when the measured solid-liquid ratio of the salting-out thickener is higher than 60%, if the minimum value of the solid-liquid ratio of the salting-out crystallizer is less than 33%, decrease the pneumatic valve at the outlet of the withdrawal pipe corresponding to the solid-liquid ratio by 5%, if the solid-liquid ratio of the salting-out crystallizer is higher than 33%, issue a reminder and manually increase the reverse feed pump.

[0080] In addition, since the extracted liquid is prone to scarring, in order to ensure the accuracy of the density meter, the density meter is steam-purged every 8 hours using steam to blow the pipeline to prevent internal scarring from affecting the accuracy of the instrument. During the cleaning process, the relevant valves need to be manually controlled to prevent misoperation.

[0081] A chain protection program is set up for the ammonium chloride removal and separation automation and safety chain device, specifically:

[0082] 1. The belt conveyor motor is interlocked with the pneumatic valve at the outlet of the second take-out pipe and the pneumatic valve at the outlet of the first take-out pipe.

[0083] 2. The centrifuge motor is interlocked with the corresponding pneumatic valve at the outlet of the second extraction pipe.

[0084] 3. The motor of the mixer and thickener is interlocked with the pneumatic valve at the outlet of the first extraction pipe.

[0085] 4. The salting-out thickener motor is interlocked with the pneumatic valve at the outlet of the third extraction pipe.

[0086] In this embodiment, the density of the clear liquid obtained by cold separation is 1.165 g / cm 3 , the density of the cold-separated liquid is ρ 冷 =1.165+0.0016*V 冷 .

[0087] The density of the clear solution of the salting out is 1.195 g / cm, and the density of the salting out solution is ρ 盐 =1.195+0.0016*V 盐 .

[0088] Through experiments, it was found that the interlocking control logic of the ammonium chloride extraction and separation automation and safety interlocking device is:

[0089] 1. When the belt conveyor fails and jumps, immediately close all the pneumatic valves at the outlet of the second take-out pipe, and at the same time immediately close the pneumatic valve at the outlet of the first take-out pipe. When the belt conveyor stops, the centrifuge immediately stops unloading to prevent a large amount of material from accumulating on the belt, causing difficulty in cleaning. At the same time, close the pneumatic valve at the outlet of the first take-out pipe to prevent mixing damage caused by accumulation of material in the mixer thickener.

[0090] 2. When a single centrifuge stops, immediately close the pneumatic valve at the second outlet of the centrifuge corresponding to the centrifuge, and at the same time close half of the pneumatic valves at the first outlet of the centrifuge to ensure that a large amount of unseparated thin material will not flow onto the belt after the centrifuge stops, causing greater production failures. When closing the pneumatic valve at the second outlet of the centrifuge that stops, close half of the pneumatic valves at the first outlet of the centrifuge to prevent material accumulation from causing damage to the mixing process.

[0091] 3. When the mixing and thickening device stops stirring, immediately close the pneumatic valve at the outlet of the first extraction pipe to prevent material accumulation due to lack of stirring in the thickener.

[0092] 4. When the salting-out thickener stops stirring, immediately close the pneumatic valve at the outlet of the third extraction pipe to prevent material accumulation due to lack of stirring in the thickener.

[0093] The embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. It should be noted that when the processor executes the computer program, the specific steps of the method provided in the embodiment of the present invention are corresponding to the specific steps of the method provided in the embodiment of the present invention, and the processor has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided in the embodiment of the present invention.

[0094] The embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. It should be noted that when the computer program is executed by the processor, it corresponds to the specific steps of the method provided in the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided in the embodiment of the present invention.

[0095] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic and safety interlocking device for removing and separating ammonium chloride, characterized in that: include: Bypass and flushing device (①) of the densitometer of the cold extraction tube, pneumatic valve (②) of the outlet of the first extraction tube, bypass and flushing device (③) of the densitometer of the liquid outlet tube of the mixing thickener, pneumatic valve (④) of the outlet of the second extraction tube, bypass and flushing device (⑤) of the densitometer of the salting out extraction tube, pneumatic valve (⑥) of the outlet of the third extraction tube, bypass and flushing device (⑦) of the densitometer of the liquid outlet tube of the salting out thickener, first current sensor (⑧), second current sensor (⑨), third current sensor (⑩) and fourth current sensor Among them, the bypass and flushing device (①) of the cold precipitation removal tube density meter includes the cold precipitation removal tube density meter, the first bypass and the first steam blowing and plugging pipeline; the bypass and flushing device (③) of the mixing thickener outlet tube density meter includes the mixing thickener outlet tube density meter, the second bypass and the second steam blowing and plugging pipeline; the bypass and flushing device (⑤) of the salting out removal tube density meter includes the salting out removal tube density meter, the third bypass and the third steam blowing and plugging pipeline; the bypass and flushing device (⑦) of the salting out thickener outlet tube density meter includes the salting out thickener outlet tube density meter, the fourth bypass and the fourth steam blowing and plugging pipeline; A first outlet pneumatic valve (②) is provided at the outlet of the cold extraction pipe, a second outlet pneumatic valve (④) is provided on the centrifuge inlet pipeline, a third outlet pneumatic valve (⑥) is provided at the outlet of the salting-out extraction pipe, a first current sensor (⑧) is provided on the motor of the mixing thickener, a second current sensor (⑨) is provided on the motor of the centrifuge, a third current sensor (⑩) is provided on the motor of the wet ammonium belt conveyor, and a fourth current sensor is provided on the motor of the salting-out thickener 2. The automatic and safety interlocking device for removing and separating ammonium chloride according to claim 1, characterized in that: The cold precipitation extraction tube density meter is arranged behind the cold precipitation crystallizer extraction tube root valve through the first bypass, the front end of the cold precipitation extraction tube density meter is installed with a first cut-off valve, the rear end of the cold precipitation extraction tube density meter is installed with a second cut-off valve, one end of the first steam blowing and plugging pipeline is connected to the low-pressure steam network, and the other end of the first steam blowing and plugging pipeline is connected to the cold precipitation extraction tube density meter inlet pipe; The density meter of the liquid outlet pipe of the mixer and thickener is arranged behind the valve at the root of the liquid outlet pipe of the mixer and thickener through the second bypass, the front end of the density meter of the liquid outlet pipe of the mixer and thickener is installed with a third cut-off valve, the rear end of the density meter of the liquid outlet pipe of the mixer and thickener is installed with a fourth cut-off valve, one end of the second steam blowing and plugging pipeline is connected to the low-pressure steam network, and the other end of the second steam blowing and plugging pipeline is connected to the inlet pipe of the density meter of the liquid outlet pipe of the mixer and thickener; The salting out tube density meter is arranged behind the root valve of the salting out crystallizer through the third bypass, the front end of the salting out tube density meter is installed with a fifth cut-off valve, the rear end of the salting out tube density meter is installed with a sixth cut-off valve, one end of the third steam blowing and plugging pipeline is connected to the low-pressure steam network, and the other end of the third steam blowing and plugging pipeline is connected to the inlet pipe of the salting out tube density meter; The density meter of the liquid outlet pipe of the salting out thickener is arranged behind the root valve of the outlet pipe of the salting out thickener through the fourth bypass, the seventh cut-off valve is installed at the front end of the density meter of the liquid outlet pipe of the salting out thickener, and the eighth cut-off valve is installed at the rear end of the density meter of the liquid outlet pipe of the salting out thickener. One end of the fourth steam blowing and plugging pipeline is connected to the low-pressure steam pipeline network, and the other end of the fourth steam blowing and plugging pipeline is connected to the inlet pipe of the density meter of the liquid outlet pipe of the salting out thickener.

3. The method applied to the automatic ammonium chloride removal and separation and safety interlocking device according to claim 1, characterized in that: Including cold precipitation to wet ammonium discharge control and salting out to reverse feed cold precipitation control; The control from cold precipitation to wet ammonium discharge includes: Step 1, measuring the density of the clear liquid of the cold-precipitated liquid and the density of the cold-precipitated liquid at a solid-liquid ratio of 20% to 60%, using a mathematical model to obtain a functional relationship between the cold-precipitated solid-liquid ratio and the density, and determining the solid-liquid ratio by measuring the density of the liquid; Step 2: Measure the solid-liquid ratio of the cold separation extraction through the cold separation extraction tube densitometer bypass and flushing device, set the target value range of the solid-liquid ratio of the cold separation extraction, and when the measured solid-liquid ratio of the cold separation extraction is lower than the minimum value of the target value range, adjust the pneumatic valve at the outlet of the first extraction tube down; when the measured solid-liquid ratio of the cold separation extraction is higher than the maximum value of the target value range, adjust the pneumatic valve at the outlet of the first extraction tube up; Step 3, measure the liquid-solid-liquid ratio of the mixer and thickener through the bypass and flushing device of the mixer and thickener outlet pipe densitometer, set the target value range of the solid-liquid ratio, when the measured liquid-solid-liquid ratio of the mixer and thickener is lower than the minimum value of the target value range, increase the pneumatic valve of the cold separation outlet pipe with the largest solid-liquid ratio, if the cold separation outlet solid-liquid ratio is less than the first threshold value, reduce the pneumatic valves of all the second outlets of the outlet pipes, if the maximum value of the cold separation outlet solid-liquid ratio is not less than the first threshold value, increase the pneumatic valve of the first outlet pipe corresponding to the maximum cold separation outlet solid-liquid ratio; When the measured liquid-solid-liquid ratio of the mixer thickener is higher than the maximum value of the target value range, if the minimum value of the solid-liquid ratio of the cold separation is not greater than the second threshold value, the pneumatic valve at the outlet of the first extraction pipe corresponding to the minimum solid-liquid ratio of the cold separation is adjusted down, and if the solid-liquid ratio of the cold separation is greater than the second threshold value, an alarm is issued; The control from salting out to reverse feeding and cold precipitation includes: Step 1, measuring the density of the clear liquid of the salting-out solution and the density of the salting-out solution at a solid-liquid ratio of 20% to 60%, using a mathematical model to obtain a functional relationship between the salting-out solid-liquid ratio and the density, and determining the solid-liquid ratio by measuring the density of the solution; Step 2, measuring the solid-liquid ratio of the salting-out crystallizer through the salting-out take-out tube densitometer bypass and flushing device, setting the target value range of the solid-liquid ratio, when the measured solid-liquid ratio of the salting-out crystallizer is lower than the minimum value of the target value range, adjusting the pneumatic valve at the outlet of the third take-out tube down, when the measured solid-liquid ratio of the salting-out crystallizer is higher than the maximum value of the target value range, adjusting the pneumatic valve at the outlet of the third take-out tube up; Step 3, measure the solid-liquid ratio of the salting-out thickener through the salting-out thickener outlet pipe density meter bypass and flushing device, set the target value range of the solid-liquid ratio, when the measured solid-liquid ratio of the salting-out thickener is lower than the minimum value of the target value range, if the maximum value of the solid-liquid ratio of the salting-out crystallizer is greater than the third threshold value, increase the pneumatic valve at the outlet of the third extraction pipe, if the solid-liquid ratio of the salting-out crystallizer is less than the third threshold value, an alarm is issued; when the measured solid-liquid ratio of the salting-out thickener is higher than the maximum value of the target value range, if the minimum value of the solid-liquid ratio of the salting-out crystallizer is less than the fourth threshold value, decrease the pneumatic valve at the outlet of the extraction pipe corresponding to the solid-liquid ratio, if the solid-liquid ratio of the salting-out crystallizer is higher than the fourth threshold value, an alarm is issued.

4. The method of claim 3, wherein the ammonium chloride is automatically separated and the safety interlocking device is provided, The functional relationship between the solid-liquid ratio and density of cold precipitation and salting out is: ρ=ρ0+0.0016*V; Wherein, ρ represents the density of the extracted liquid of the test liquid, ρ0 represents the density of the clear liquid of the extracted liquid of the test liquid, and V represents the volume occupied by the solid and liquid in the test liquid.

5. The method of claim 3, wherein the ammonium chloride is automatically separated and the safety interlocking device is provided, During the cold precipitation to wet ammonium discharge control, the target value range of the cold precipitation solid-liquid ratio is 40-45%; Reduce the pneumatic valve at the outlet of the first extraction pipe by 5%; Increase the pneumatic valve at the outlet of the first extraction pipe by 5%; The target value range of liquid-to-solid ratio of the mixer thickener is 70-75%; The first threshold is 42%; Increase the pneumatic valve at the outlet of the first extraction pipe corresponding to the maximum solid-liquid ratio of cold separation by 5%; The second threshold is 43%; Reduce the pneumatic valve at the outlet of the first extraction pipe corresponding to the minimum solid-liquid ratio of cold separation by 5%.

6. The method of claim 3, wherein the ammonium chloride removal and separation automation and safety interlocking device is characterized in that: In the control of salting out to reverse feeding and cold precipitation, the target value range of the solid-liquid ratio of the salting out crystallizer is 30-35%; Reduce the pneumatic valve at the outlet of the third extraction pipe by 5%; Increase the pneumatic valve at the outlet of the third extraction pipe by 5%; The target range of solid-to-liquid ratio in the salting-out thickener is 55-60%; The third threshold is 32%; Increase the pneumatic valve at the outlet of the third extraction pipe by 5%; The fourth threshold is 33%; Reduce the pneumatic valve at the outlet of the take-out pipe corresponding to the minimum solid-liquid ratio of the salting-out crystallizer by 5%.

7. The method of claim 3 for the automated separation and safety interlocking device for ammonium chloride removal, characterized in that: Steam purge the density meter every 8 hours using steam to blow out the plugged pipeline.

8. The method of claim 3 for the automated separation and safety interlocking device for ammonium chloride removal, characterized in that: Setting up the chain protection procedure includes the following:

1. The belt conveyor motor is interlocked with the pneumatic valve at the outlet of the second take-out pipe and the pneumatic valve at the outlet of the first take-out pipe; 2. The centrifuge motor is interlocked with the pneumatic valve at the outlet of the second extraction tube; 3. The motor of the mixer and thickener is interlocked with the pneumatic valve at the outlet of the first extraction pipe; 4. The salting-out thickener motor is interlocked with the pneumatic valve at the outlet of the third extraction pipe.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for the automated ammonium chloride removal and separation and safety interlocking device described in any one of claims 3 to 8 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method of the automated ammonium chloride extraction and separation and safety interlocking device described in any one of claims 3 to 8 is executed.

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