33 results about "Chemical procedure" patented technology

The invention provides a chemical process safe and stable operation method and system combined with a DCS, and relates to the technical field of chemical process control, and the method comprises the steps: firstly collecting multi-dimensional operation data of each operation link of a chemical process, and forming a disturbance trigger signal set through multi-feature correlation analysis; constructing an operation element disturbance diffusion dynamic logic map based on the chemical process network; evaluating the response capability of the DCS control node according to the disturbance trigger signal set and the running element disturbance diffusion dynamic logic map, dividing multiple response stages and determining a core operation range; generating a control node composite operation sequence containing a conventional sequence and an emergency sequence; issuing a control node composite operation sequence and performing real-time monitoring to form a running state dynamic tracking record; and on the basis of the running state dynamic tracking record verification correction atlas and logic, a self-adaptive dynamic response mechanism is formed through multi-round iteration, and safe and stable running of the chemical process is guaranteed.

The present application relates to the field of industrial software, and provides a chemical process automatic generation method, system and medium. The chemical process automatic generation method comprises the following steps: receiving a natural language description about an industrial process, wherein the natural language description comprises design constraints of the industrial process; starting a multi-agent collaboration system, converting the natural language description into an intermediate representation of the design process through closed-loop interaction among the multi-agents, wherein the multi-agent collaboration system utilizes a semantic entropy index to monitor the logical determinacy of each generation node in the process of generating the design process and triggers a real-time correction mechanism according to the uncertainty quantification result; mapping the intermediate representation into executable instructions of a heterogeneous simulation engine through an adaptation interface to drive the heterogeneous simulation engine to perform physical simulation calculation; and asynchronously extracting the calculation result of the heterogeneous simulation engine to realize closed-loop verification of the design process.

The application relates to the field of automatic control, in particular to an automatic control system and method for a chemical process pump. The system comprises: a gap detection module configured to collect a first gap G1 between an impeller and a front wear plate; a compression amount detection module configured to collect a compression amount of a mechanical seal to obtain a sealing compression amount C; and a programmable logic controller (PLC) configured to generate a third control instruction based on a first difference D1 and send the third control instruction to a first driving module to drive the first driving module to drive a first adjusting top screw to reduce an axial gap between the front wear plate and the impeller by the first difference D1 when a real-time comprehensive amount Q is greater than a comprehensive amount threshold Q1 and the sealing compression amount C is less than a first compression amount limit C1. The system can realize collaborative and accurate control of the gap and the seal, improve the operation safety, ensure the continuous chemical production, and reduce the downtime loss.

The present application relates to the field of chemical process simulation, and particularly relates to a simultaneous equation simulation block solving method for process industry. The method comprises the following steps: extracting equations in an activated state and variables in an unfixed state from a chemical process model to form an original equation and variable set to be solved; converting the equation and variable set into a graph data structure reflecting system dependency according to a preset block strategy; using a strongly connected component identification algorithm to traverse the graph data structure to obtain a strongly connected component set, each strongly connected component in the strongly connected component set corresponding to a sub-equation block in the process equation; determining a solving order of the sub-equation blocks according to the dependency of the sub-equation blocks; solving each sub-equation block according to the solving order of the sub-equation blocks; and collecting the solving results of each sub-equation block to obtain a global solution of the complete chemical process model.

This utility model discloses a double-sealed chemical process pump, relating to the technical field of chemical process pumps. It includes a fixed motor and a pump head. A second connecting flange is fixedly installed on the side of the fixed motor, and a first connecting flange is fixedly installed on the side of the pump head. The first connecting flange is connected to the second connecting flange. This double-sealed chemical process pump utilizes a water-swellable rubber ring. When the first layer of seal leaks—that is, when leakage occurs between the first sealing strip and the first sealing groove—the fluid medium comes into contact with the interior of the water-swellable rubber ring. At this time, the water-swellable rubber ring expands, fitting tightly against the interior of the fixed cavity and forming a seal. This improves the sealing effect of the connection between the first and second connecting flanges, facilitates disassembly and assembly, reduces installation difficulty, and allows for quick assessment of the pump's sealing condition for subsequent operations.

This invention relates to the field of intelligent processing of chemical process diagrams and industrial image recognition technology, specifically to an intelligent parsing and change management method for chemical process diagrams (P&ID) based on image processing. The method includes: acquiring a two-dimensional degraded document image containing unstructured modification traces; extracting underlying image connectivity features and character features; inputting a graph neural network to reconstruct an initial logical topology network; dividing local regions and detecting logical conflicts using deterministic topology rules, quantifying the probability value of topological logical conflicts; comparing with a preset danger threshold, actively severing logical connections in high-risk areas and marking them as isolated sub-graph regions awaiting manual review, while retaining connectivity paths in low-risk areas to generate a global topology network; updating the global topology network based on manual review feedback, and outputting the final document drawing change parsing version. This invention significantly improves the recognition stability of complex on-site drawings.

The invention relates to the technical field of pump bodies, in particular to a gas-liquid separation pipe of a chemical process pump. The device comprises a water inlet pipe, an internal thread, a filter shell, a valve chamber, a separation shell, a spiral flow channel and a cylindrical separation part, the water inlet end of the water inlet pipe is connected with an external water source, the internal thread is arranged on the inner wall of the water inlet pipe, the bottom of the filter shell is communicated with one end of the water inlet pipe, the valve chamber is communicated with the top of the filter shell, the bottom end of the separation shell is communicated with the top of the valve chamber, and the spiral runner is arranged in an inner cavity of the separation shell and surrounds the cylindrical separation piece. The cylindrical separation part is communicated with the contact surface of the spiral flow channel, and the top end of the cylindrical separation part penetrates through the top end of the separation shell and extends out of the separation shell; water flow is forced to form rotating turbulent flow through a lead angle internal thread, micro-bubbles are induced to collide and coalesce into large bubbles larger than 200 microns, and the separability is improved.

The utility model provides a closed sampling and decompression cooling integrated device for a chemical process, which relates to the technical field of chemical sampling and comprises a centralized cooling system and a bottom plate. A cooling inlet and a cooling outlet of the centralized cooling system are connected with the jacket cooling systems through pipelines, a cooling inlet valve and a cooling outlet valve are installed on the pipelines respectively, and a first connecting pipeline is installed at an outlet of each jacket cooling system. A sampling steel cylinder is mounted at one end of the first connecting pipeline and is connected with the inlet. The output end is controlled to retract through the pushing air cylinder, so that the mounting frames on the two sides move towards the inner side, a sampling steel cylinder can be fixed between the arc-shaped clamping plates on the two sides, the sampling steel cylinders of different specifications can be clamped and fixed, taking and placing operation is more convenient, manual operation is reduced, the use process is more convenient, and the working efficiency is improved. And moving wheels are mounted at the bottoms of the supporting legs, so that the integral structure for fixing the sampling steel cylinder can move, and the sampling steel cylinder can be conveniently transferred.

The application provides a chemical process diagram information extraction method and system, and relates to the technical field of image processing. The method comprises the following steps: text extraction is performed on the process diagram to obtain each text and a corresponding bounding box; chemical object detection is performed on the process diagram to obtain attribute information of each chemical object in the process diagram; based on the positional relationship between the bounding box of the target text and each chemical object, the chemical object to which the target text belongs is determined, and the two are bound; based on the direction vector of the material flow line in the process diagram and the bounding box of the chemical object, the predecessor and successor of each chemical object are determined; based on the topological relationship and text binding relationship of all obtained chemical objects, a structured prompt word is constructed; through a visual language model, process information extraction is performed on the process diagram under the constraint of the structured topological relationship of the structured prompt word, and a process diagram file corresponding to the process diagram is obtained. The application aims to improve the information extraction accuracy of the chemical process diagram.

The application relates to the field of intelligent engineering design, and discloses a chemical process unit modularization division method and system based on a process adaptation path, which first acquires process operation parameter time sequence data of each device node and constructs an initial directed graph based on material flow direction, uses a transfer entropy algorithm to quantize normal fluctuation probability, combines a multi-dimensional Copula function to extract tail correlation coefficients under extreme working conditions, combines the two to obtain dynamic process coupling weights, and reconstructs a weighted process directed graph according to the dynamic process coupling weights, then performs graph clustering cutting to divide candidate modules with an agglomeration weight sum greater than a coupling weight sum, and finally uses space size and pipeline stress thresholds for constraint checking to output a final division scheme, the application realizes high cohesion and low coupling of a chemical module by fusing nonlinear fluctuation causality and extreme risk characteristics, effectively improves the anti-interference ability and system stability when a device is running under variable load, and avoids the mechanical failure risk of a module connection boundary.

The present application relates to the technical field of centrifugal pump, in particular to a chemical process pump with gradually changing impeller blade timing, comprising a pump shell, an impeller assembly rotatably installed in the pump shell, and a pump shaft for providing power for the rotation of the impeller assembly, wherein the impeller assembly comprises movable blades; further comprising: a transmission mechanism arranged on the pump shell for transmitting power between the pump shaft and the impeller assembly; and a centrifugal connecting mechanism arranged on the pump shaft for realizing the power connection between the pump shaft and the transmission mechanism. In the initial state, the pump shaft and the impeller assembly are disconnected, and as the rotation speed of the pump shaft increases, the blades are gradually adjusted from the initial gathering state to the open working state through the transmission of the transmission mechanism, the centrifugal connecting mechanism and the adjusting mechanism; when the impeller assembly is initially rotated, the blades are in the gathering state, which can reduce the effective flow area of the outlet of the impeller assembly, reduce the work done by the blades on the fluid, and reduce the initial torque and the peak value of the motor current.

The utility model relates to the field of petroleum chemical process pump, especially to the petroleum chemical process pump of preventing leakage, technical scheme: the petroleum chemical process pump of preventing leakage, including have pump machine body, liquid inlet pipe, liquid outlet pipe, no. The utility model is provided with the buckle and the slot on the transportation pipeline connected with the pump machine body, and the buckle is clamped in the slot to fix the sealing ring on the pipeline.

The invention discloses a sealing compensation and intelligent cooling system of a zero-leakage chemical process pump, and particularly relates to the technical field of chemical process pumps, which comprises a chemical process pump system starting module, an intelligent control module, a temperature detection and liquid speed control module, a temperature monitoring and judging module and a continuous monitoring and dynamic adjusting module, before the temperature monitoring and judging module transmits a monitoring result to the continuous monitoring and dynamic adjusting module, a temperature abnormity judging link, a shutdown preparation module, a temperature monitoring and shutdown confirmation module and a system closing module are arranged; a cooling adjusting algorithm based on the fuzzy PID control principle is adopted in the system, and the flow speed of cooling liquid can be adjusted in real time according to the actual temperature change of a pump body; compared with a traditional fixed flow cooling mode, the algorithm can control the cooling effect more accurately, energy waste caused by overcooling is avoided, meanwhile, it is ensured that the temperature of the pump body is always within the safety range, the cooling efficiency is improved, and the operation cost is reduced.

A solution method for batch simulation of complex processes based on modular decomposition is proposed, relating to the field of chemical process simulation technology. A decoupling method for model solution is proposed, decomposing the simulation solution of highly integrated complex processes into three stages: First, the process is simplified to a non-cyclic process and its feasibility is verified; second, the strong coupling of the process is broken by fracturing key tear streams, and operating parameters are adjusted to achieve process convergence after fracturing; finally, the tear stream data saved from the second stage simulation is assigned to the original process, and the final global solution is obtained after solving. For cases where convergence is still difficult in stages two and three, the success rate of the method is further improved by combining an intra-batch data migration mechanism and a cyclic diversion measure. This effectively solves the problem of unsolvable batch simulations, achieving a process run convergence rate of over 80%, significantly improving the success rate of batch simulation solutions and overall solution efficiency.

The invention discloses a big data-based chemical process flow analog simulation method and system, and relates to the field of chemical processes, and the method comprises the steps: receiving an intervention target set by a user, collecting historical data of a target chemical process flow, and carrying out the preprocessing to form a historical data set; training an initial simulation model taking the process parameters as input and taking the historical reference indexes as output by utilizing the historical data set, analyzing the historical data set by adopting a causal discovery algorithm, and constructing a causal graph of the causal relationship between the process variables; based on the intervention target, identifying candidate causal paths from the controllable process parameters to the intervention target from the causal graph of the causal relationship between the process variables; and reconstructing the initial simulation model according to the causal diagram and the candidate causal paths to obtain a causal diagram simulation model. According to the method, deepening from data driving to causal inference is realized, and the interpretability and optimization accuracy of chemical process simulation are improved.

The utility model discloses a double-sealed chemical process pump, which relates to the technical field of process pumps and comprises a support bottom plate. The double-sealed chemical process pump comprises a supporting bottom plate, a process pump body is installed on the upper surface of the supporting bottom plate, a first conveying pipe is arranged on the upper surface of the front end of the process pump body, a first connecting pipe is arranged on the outer surface of the first conveying pipe, and a pressure release valve is arranged at the output end of the first connecting pipe. Through the arrangement of the threaded rod, the pressure regulating spring can be pressed down in a spiral transmission mode according to the use requirement of the process pump body to regulate the pressure threshold value of the pressure release valve, so that the pressure release valve can be automatically opened when the pressure reaches a set value, redundant pressure is released, the pressure is prevented from continuously rising, and safe operation of the pump and the whole system is guaranteed; and through the arrangement of the storage tank, leaked chemical raw materials can be collected, so that environmental pollution caused by leakage of the chemical raw materials is avoided.

The invention relates to the field of automatic control, in particular to an automatic control system and method for a chemical process pump. The system comprises: a gap detection module configured to: collect a first gap G1 between an impeller and a front wear plate; the compression amount detection module is configured to collect the compression amount of the mechanical seal to obtain the seal compression amount C; the PLC is configured to generate a third control instruction based on the first difference value D1 under the condition that the real-time comprehensive quantity Q is larger than a comprehensive quantity threshold value Q1 and the sealing compression amount C is smaller than a first compression amount limiting value C1, and send the third control instruction to the first driving module, so that the first driving module drives a first adjusting jackscrew, and the second driving module drives a second adjusting jackscrew to adjust the sealing compression amount C; and then the axial gap between the front wear-resisting plate and the impeller is reduced by a first difference value D1. According to the system, cooperative precise control over gaps and sealing can be achieved, the operation safety is improved, continuous chemical production can be guaranteed, and shutdown losses are reduced.

The application belongs to the technical field of chemical process simulation, and discloses a parameter value correction method of a chemical process simulation program.The parameter value correction method of the chemical process simulation program comprises the following steps: iteratively calculating according to initial values of a plurality of parameters input in the simulation program; judging whether the result of the iterative calculation converges; if the result of the iterative calculation does not converge, determining a to-be-corrected parameter and a correction value of the to-be-corrected parameter from the plurality of parameters; replacing the initial value of at least one to-be-corrected parameter with the corresponding correction value, and iteratively calculating again to judge whether the result of the iterative calculation converges.The application simplifies the processing steps of the non-convergence phenomenon in the chemical process simulation program, enables the chemical process simulation program to have a certain parameter correction function, and has a certain positive effect on reducing the work difficulty of technical personnel and improving the design efficiency of the simulation program.

1. The name of the design product: chemical process pump. 2. The use of the design product: used in petroleum and chemical industry, oil refinery, water supply plant, power plant, etc. to transport liquid with or without trace of fine particles. 3. The design points of the design product: in shape. 4. The picture or photo showing the design points: perspective view 1.

The invention relates to a chemical process centrifugal pump impeller dynamic balance test process and test system. The test system comprises a simulation pump shell used for installing an impeller to be tested; the fluid circulation system is connected with the simulation pump shell to form a circulation loop; the fluid switching system is used for switching a basic medium of the magnetic response fluid; the magnetic field generating device is used for applying a magnetic field to the magnetic response fluid in the simulation pump shell so as to adjust the viscosity of the magnetic response fluid in real time, and is used for simulating the dynamic balance state of the impeller to be tested in fluids with different viscosities or fluids with non-uniform viscosities; the viscosity sensor is used for monitoring the viscosity of the magnetic response fluid in the simulation pump shell; and the simulation controller is in signal connection with the viscosity sensor and the magnetic field generation device and is configured to perform closed-loop regulation on the magnetic field intensity of the magnetic field generation device according to the real-time viscosity signal fed back by the viscosity sensor so as to maintain the stability of the viscosity of the magnetic response fluid. The dynamic balance test can be continuously carried out on one set of equipment during multi-viscosity fluid simulation pumping.

The utility model discloses a kind of high-temperature high-pressure wear-resistant petroleum chemical process pump, it is related to petroleum chemical process pump technical field, including motor assembly and pump head assembly, motor assembly and pump head assembly are connected.The utility model said a kind of high-temperature high-pressure wear-resistant petroleum chemical process pump, fixed snap pin is clamped in the inside of another clamping hole of rotating shaft, first base and second base can be connected quickly, split type structure, and bottom can be moved by moving roller, it is convenient for the movement and assembly of chemical process pump, flexible, portable, improve the flexibility of device, utilize the slope of filter screen, make solid particle slide to the bottom of filter screen, due to the blocking of baffle, the medium flow rate is slower at this place, solid particle is affected by gravity and falls into the inside of residue pipe and accumulates, reduce solid particle in the inside movement of chemical pump, and then reduce the damage of solid particle to pump inner wall, improve the service life of pump.

The present application belongs to the technical field of chemical process pumps, and particularly relates to an early warning system for chemical process pump failures, comprising multiple sets of pumps equipped with sound collection devices, signal relay stations and a signal receiving central station; the sound collection device comprises a sound collection end, which is arranged in the pump; the sound collection device can convert real-time sound signals collected by the sound collection end into initial sound data and send them; the signal receiving central station comprises a signal receiver and an upper computer, which is provided with a data processing system and an early warning judgment system. Compared with the prior art, the present application has the following advantages: it can collect sound information emitted by bearings during operation in a directional manner, has accuracy and timeliness, and can provide data support and basis for predictive maintenance; by using the principle of frequency spectrum analysis and the early warning judgment system, it can provide early warning in the early stage of failure, quickly determine the failure type by analyzing the frequency spectrum state, shorten the maintenance time and reduce the maintenance cost.

This invention discloses a method and system for evaluating chemical processes involving green electricity-to-hydrogen synthesis, ammonia synthesis, and methanol synthesis, relating to the field of green electricity-coupled chemical process evaluation technology. The method includes: determining green electricity and core unit parameters; constructing and calibrating unit performance models to obtain core performance items; establishing a full-process steady-state model using an integrated model, introducing green electricity fluctuations for dynamic simulation to obtain full-process process stability items; analyzing the attenuation law of core performance items under fluctuations, calculating the corresponding load adjustment energy consumption increment and equipment operating condition adaptation cost to obtain green electricity fluctuation adaptability items; using pinch technology to analyze hot and cold flow streams and designing a waste heat cascade recovery network, calculating the waste heat recovery amount and system energy efficiency improvement rate to obtain energy optimization efficiency items; and substituting the above four evaluation items into the target evaluation model for comprehensive evaluation, outputting the process evaluation results. This invention can mitigate the impact of green electricity fluctuations on chemical processes and achieve evaluation of process performance.

The application discloses an electrolyte crystallization simulation method and device based on Gibbs free energy minimization, equipment and medium, relates to chemical engineering separation simulation calculation technical field, and the method is to obtain the material flow, component composition and other working condition parameters of the crystallizer feed stream, and the temperature and pressure operating conditions of the target system, and the solid phase component information of the electrolyte to be precipitated; based on the principle of Gibbs free energy minimization, the total Gibbs free energy objective function is constructed, the solid-liquid phase equilibrium problem is converted into a nonlinear programming problem with constraints by applying equality and non-negative constraints; the solid-liquid phase equilibrium result is obtained by using the interior point method, and finally, the crystallization solid phase fraction is determined, and the liquid phase composition, solid phase type and crystallization amount are output. The application does not need to preset the solid phase precipitation sequence, is suitable for complex systems with multiple salt coexistence and multiple solid phase competitive precipitation, significantly improves the solving stability and calculation accuracy, and can be directly integrated into chemical process simulation software, thereby providing reliable bottom calculation support for crystallization process design.

The utility model relates to the technical field of ultra-small flow petrochemical process pumps, in particular to an ultra-small flow petrochemical process pump which comprises a process pump body, an adjusting assembly is arranged at the bottom of the process pump body, the adjusting assembly is arranged on the ultra-small flow petrochemical process pump, and a threaded rod can be driven to rotate by rotating an adjusting knob. The threaded rod drives the adjusting block to move when rotating, the adjusting block can drive the adjusting seat to move left and right, so that the left-right position of the process pump body can be adjusted, the front-back position of the process pump body can be adjusted by sliding the moving plate after the fixing bolt is detached, and the adjusted position can be fixed through the fixing bolt and the adjusting hole. Therefore, after the process pump body is fixed, the process pump body can be adjusted again, so that the process pump body is more convenient to install, and the whole device is simple in structure, convenient to operate and higher in practicability.

The invention relates to the technical field of centrifugal pumps, in particular to a chemical process pump with impeller blades gradually changing in time sequence, which comprises a pump shell, an impeller assembly rotatably mounted in the pump shell and a pump shaft used for providing power for rotation of the impeller assembly, and the impeller assembly comprises movably arranged blades; the transmission mechanism is arranged on the pump shell and used for transmitting power between the pump shaft and the impeller assembly; the centrifugal connecting mechanism is arranged on the pump shaft and used for achieving power connection between the pump shaft and the transmission mechanism. In the initial state, the pump shaft and the impeller assembly are in a disconnected state, and along with increase of the rotating speed of the pump shaft, the blades are gradually adjusted from the initial gathering state to the opening working state through transmission of the transmission mechanism, the centrifugal connecting mechanism and the adjusting mechanism; when the impeller assembly initially rotates, the blades are in a gathering state, the effective circulation area of an outlet of the impeller assembly can be reduced, the acting capacity of the blades on fluid is reduced, and the initial torque and the motor current peak value are reduced.

The invention discloses a chip fan-out packaging method and a chip fan-out packaging structure, and the packaging method comprises the steps: providing a silicon substrate and a chip, and bonding a non-functional surface of the chip to a first surface of the silicon substrate; forming a plastic package layer wrapping the chip, and exposing a chip bonding pad through laser windowing; performing metal wiring on one side of the functional surface of the chip to form a rewiring structure; one side of the first surface of the silicon substrate is temporarily bonded to the temporary substrate, and the second surface of the silicon substrate is thinned; mounting a diamond radiating fin on the second surface of the silicon substrate; and removing the temporary substrate and the bonding layer. The packaging structure comprises a silicon substrate, a chip, a plastic packaging layer, a rewiring structure and a diamond cooling fin. According to the scheme, the plastic packaging layer and the passivation layer are made of the resin / glue and inorganic matter mixed material, traditional photoetching is replaced with laser windowing, multiple chemical procedures and high-cost consumables are omitted, and the packaging cost is remarkably reduced; and the diamond cooling fins are used to solve the problem of poor heat conduction of the traditional plastic package, the heat dissipation requirement of the high-power-consumption chip is met, and the ultrathin packaging and the high-density integration are both considered.

1. The name of this design product: chemical process pump. 2. Application of this design product: used for conveying media in petrochemical production. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

The invention provides a chemical process optimization method and device, a storage medium and electronic equipment. A reconstruction step: reconstructing the quadratic programming problem in the chemical process simulation to obtain a target quadratic programming problem; a solving step: converting the target quadratic programming problem into a quadratic programming equation set meeting a KKT condition, and solving the quadratic programming equation set by adopting a preset strategy to obtain a solving result of the quadratic programming equation set; a selection step: based on the solving result of the quadratic programming equation set, determining the blocking constraint by adopting an improved blocking constraint stable selection strategy, and judging whether the solving reaches a preset convergence condition or not by utilizing the blocking constraint; repeating the steps, if the preset convergence condition is not met, repeatedly executing the solving step and the selecting step until the preset convergence condition is met, obtaining a solving result of the quadratic programming problem in the chemical process simulation, and applying the solving result to the corresponding actual chemical process. The problem that the solving efficiency of simulation optimization of the chemical process is low is solved.

The invention relates to the field of chemical production monitoring and analysis, in particular to a real-time monitoring and intelligent analysis system and method for chemical production data. The method comprises the following steps: acquiring chemical production data, and constructing a chemical production network according to the chemical production data; the method comprises the following steps: acquiring real-time production signal data of a chemical production network, analyzing the chemical production network to obtain a task production value, a cycle use degree and a production cycle, analyzing the production cycle to obtain an expected production value, and obtaining a task monitoring signal according to the expected production value and the task production value; analyzing the chemical process node, the production node and the task production value through a chemical production network to obtain a process production value, and obtaining a production process signal according to the process production value and the chemical process node; and generating a chemical production management strategy according to the task monitoring signal and the production flow signal. The chemical production safety can be improved.