14 results about "Reflux flow" patented technology

The present application relates to a kind of internal and external reflux and dosing control method and system, applied to AAO process wastewater treatment system, the control method includes: internal reflux control;The internal reflux control includes internal reflux feedback control, the internal reflux feedback control includes: based on the target TN value of effluent, according to the first real-time ammonia nitrogen concentration of the end of aerobic tank, determine the first target nitrate nitrogen concentration of the end of aerobic tank;According to the error of the first real-time nitrate nitrogen concentration of the end of aerobic tank and the first target nitrate nitrogen concentration, feedback control is used to determine the feedback internal reflux flow of internal reflux pipeline, and the feedback internal reflux flow is used to adjust the total flow of internal reflux pipeline, to stabilize the real-time TN value of effluent around target TN value.The method of the present application can eliminate the nitrate nitrogen concentration fluctuation of the end of aerobic tank caused by influent quality fluctuation, and then achieve the purpose of accurately controlling the real-time TN value of effluent.

This invention discloses a vacuum crystallization purification process for menthyl benzoate, comprising the following steps: S100, feeding; S200, cooling; S300, centrifugation. The parameter control process in step S200, cooling, specifically includes the crystallization temperature range, vacuum degree, methanol reflux flow rate, reflux methanol temperature, condenser medium, temperature rebound time, two-stage slow cooling method, multi-stage cooling method, and purity control of the menthyl benzoate raw material. This invention utilizes a rapid cooling method involving vacuum absorption and methanol reflux. Through precise temperature control, the system enters a transient stable state of crystallization before crystallization, where supersaturation and dissolution saturation are in equilibrium. Through two-stage slow cooling and multi-stage cooling stages, the system gradually enters a supersaturated solution state. Due to the precise control of the saturation-supersaturation-crystallization state, impurities cannot crystallize, thus achieving deep purification and obtaining a high-purity crystalline product.

This application discloses a control method, device, medium, and equipment for steam regulation in a propane stripper, comprising the following steps: Step S1: When the measured value of the side stream liquid level is ≥95.5% and the differential pressure on the tray is >35 kPa, the setting value of the steam flow regulating valve is lowered at intervals of 10 times / minute; Step S2: When the measured value of the side stream liquid level is <95% and the differential pressure on the tray is <48 kPa, the setting value of the steam flow regulating valve is raised at intervals of 10 times / minute; Step S3: The propylene reflux flow rate is measured using a flow detection device. When the propylene reflux flow rate is lower than 4100 kg / h, the steam feed rate is increased; Step S4: When the propylene reflux flow rate is higher than 4500 kg / h, the steam feed rate is reduced in multiple adjustments to maintain the propylene reflux flow rate at or above 5100 kg / h. After adopting this method, the top reflux flow rate of the propane stripper was stabilized at around 5100 kg / h, which solved the problem of intermittent and large fluctuations in the top reflux flow rate. After being put into use, the top output of the tower is sufficient and stable, and the side output level gauge is stable at 104%, ensuring the stable operation of the propylene recovery pump.

A control method for self-regenerative distillation of ethylene glycol includes the following steps for controlling the concentration of butanediol at the top of an ethylene glycol dealcoholization column: measuring the concentration of butanediol at the top of the column; establishing a butanediol concentration trend prediction model and predicting the butanediol concentration trend; controlling the butanediol concentration; controlling the reflux ratio; controlling the top reflux flow rate based on changes in the butanediol concentration; and controlling the reflux flow rate regulating valve.

1. The name of the design product: triangular lying pillow (anti-stomach flow). 2. The use of the design product: for lying on the bedside. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: combined state reference drawing. 5. The bottom of component 2 and component 3 of the design product is not easy to see or not visible during use, omitting the component 2 and component 3 bottom view.

The invention provides a control method, device and equipment for a partition plate type side-mining coarse separation tower and a medium. The method comprises the steps that the real-time feeding amount of the coarse separation tower and the real-time temperature of a target detection point are obtained; feedforward control is carried out on the steam flow of the coarse separation tower according to the real-time feeding amount so as to reduce the fluctuation of the upper temperature of the side mining tower, and the feedforward control is a control mode of adjusting the steam flow in advance according to the change of the feeding amount; according to the real-time temperature of the left lower temperature detection point and a corresponding first target control value, the small backflow flow is adjusted based on left lower temperature-small backflow cascade control, so that the temperature fluctuation of the left lower temperature detection point is reduced; and according to the real-time temperature of the tower top temperature detection point, the large reflux flow is subjected to compensatory adjustment, so that the temperature fluctuation of the tower top temperature detection point is reduced. The control precision of the partition plate type side-mining rough separation tower can be improved.

The utility model provides an atmospheric tower long-period operation system of a boiling bed residual oil hydrocracking unit. The atmospheric tower long-period operation system comprises an atmospheric tower and a reflux pipeline, a second side line outlet of the atmospheric tower is connected to a first inlet of the atmospheric tower through a reflux pipeline, and the reflux pipeline is sequentially connected with a reflux pipeline valve, a first pump inlet filter, a first reflux pump, a reflux flowmeter and a reflux valve group; the reflux pipeline is connected with an external reflux pipeline, the inlet end of the external reflux pipeline is connected to a front path of the reflux valve group, and the outlet end of the external reflux pipeline is connected to a No.2 inlet of the atmospheric tower; the external reflux pipeline is sequentially connected with an external reflux flowmeter and an external reflux valve group; the washing effect of the lower tray of the atmospheric tower can be improved, and the product quality is ensured.

This application relates to the field of lithium battery production technology, specifically disclosing a dust removal structure and system that forms a reflux flow. The dust removal system includes: a dust removal platform; a settling tank on the dust removal platform; a positive pressure jet duct and a negative pressure suction duct within the settling tank; and the negative pressure suction ducts located on both sides of the positive pressure jet duct along its width. In this solution, the dust removal platform can be positioned directly opposite the area to be dusted, and the positive pressure jet duct sprays compressed high-speed airflow into the area to be dusted to blow away contaminants from the material surface; the negative pressure suction ducts simultaneously absorb contaminants from both sides, avoiding the risk of secondary dust generation and secondary contamination of the material. Since both the positive pressure jet duct and the negative pressure suction duct are located within the settling tank, an airflow circulation channel is formed between them, while simultaneously creating an airflow field on the settling tank, effectively controlling the diffusion of contaminants and improving dust removal efficiency and effect.

This invention discloses a methanol reflux recovery device for the production of methyl chloroacetate, comprising an esterification reaction tower with an ester-water separator connected to its top via a pipe; and a reflux recovery unit comprising a methanol distillation tower and a reflux distribution mechanism. By setting up the reflux recovery unit, a channel switching device switches the flow path to connect either the sealed working chamber to the inlet pipe or the outlet pipe. When connected to the inlet pipe, methanol solution is rapidly and quantitatively drawn into the sealed working chamber. When connected to the outlet pipe, the quantitatively stored methanol solution in the sealed working chamber is rapidly pressurized to the reflux pipeline, opening the anti-backflow sealing device to form a conductive path, allowing methanol to reflux into the esterification reaction tower. When the channel switching device switches again, methanol solution is continuously drawn into the sealed working chamber according to a preset volume. By controlling the number of pumping and discharging actions of the channel switching device and the piston, the total reflux flow rate of methanol solution returning to the esterification reaction tower can be precisely controlled, effectively ensuring that the reflux flow rate is stable and controllable within a set range.

The invention provides an adaptive fuzzy echo state network control method for a denitrification process, and the method comprises the steps: simulating the whole sewage treatment process, simplifying a nitrate nitrogen concentration kinetic model, and obtaining a simplified kinetic model; derivation is carried out on the defined time-delay-error-free signal; fitting an unknown function by using a fuzzy echo state network, and designing an output weight adaptive updating law comprising error information for the fuzzy echo state network; deducing a delay-free control law by using the delay-free error signal, extracting the internal reflux quantity at the current moment, and performing nitrate nitrogen concentration control by taking the internal reflux quantity as the control input of a sewage treatment system; and carrying out stability verification on the time-delay-error-free signal, and carrying out convergence proving on an output weight self-adaptive updating law. Accurate finite time tracking control of nitrate nitrogen concentration in the denitrification process is achieved, and the control problem caused by water quality fluctuation and backflow delay is solved.

This invention discloses a layered economic optimization predictive control method for distillation columns. The two-layer predictive control strategy of this invention includes an economically self-optimizing steady-state optimization layer and a setpoint tracking dynamic control layer, aiming to simultaneously satisfy economic and control performance objectives. The steady-state optimization layer solves for the optimal objective function of the distillation column's steady-state model under constraints of input and output values ​​such as the distillation column outlet concentration and reflux flow rate, determining the optimal steady-state input and output that maximize economic benefits. The dynamic control layer employs an improved dynamic matrix control algorithm, outputting the optimal manipulated variables to the valve opening or the setpoint of a traditional PID controller, achieving dynamic tracking control of the optimal setpoint, and ultimately completing the multi-objective layered predictive control of the distillation column.

The utility model discloses a rectifying device for industrial carbon dioxide production, which is characterized in that a plurality of sieve tray plates are arranged in a rectifying tower at equal intervals, sufficient space is provided for gas-liquid mass transfer, the sieve structure is beneficial to uniform distribution and mixing of gas and liquid, the mass transfer effect is enhanced, and carbon dioxide and impurities can be efficiently separated. The reboiler naturally circulates according to the thermosyphon principle, additional pumps are not needed, equipment investment and energy consumption are reduced, the heating power can be accurately adjusted through a heating medium conveying and discharging pipe, and the temperature and pressure in the tower are kept stable. And the condenser is tubular, so that the heat transfer area is large, and the cooling efficiency is high. In the aspects of feeding, discharging and control, the feeding pipe is provided with a flow regulating valve, the tail end of the condensation outlet pipe is provided with a pressure regulating valve, and the reflux pipe is provided with a reflux regulating valve, so that the feeding flow, the tower top pressure and the reflux flow can be respectively regulated, the material balance is favorably maintained, the tower pressure is stabilized, and the reflux ratio is optimized, thereby improving the rectification efficiency and the product purity and reducing the energy consumption.

The invention relates to a carbon source adding operation control method and system for a sewage treatment plant and a medium, and the method comprises the following steps: obtaining the dissolved oxygen concentration of an aerobic zone in the sewage treatment plant, the reflux flow of a mixed solution refluxed from the aerobic zone to an anoxic zone, the water inlet flow of the anoxic zone, the water inlet load, the nitrate nitrogen concentration and the total nitrogen concentration; calculating surplus dissolved oxygen; determining the compensation dosage of the carbon source; inputting the water inlet load and the nitrate nitrogen concentration into a preset carbon demand calculation model to obtain a denitrification carbon demand; calculating the total carbon source adding amount, and generating a first adding frequency of the carbon source adding pump according to the total carbon source adding amount; obtaining the aeration intensity of the aerobic zone in a preset time window, and generating an aeration disturbance correction coefficient based on the aeration intensity; and correcting the first adding frequency according to the aeration disturbance correction coefficient to obtain a second adding frequency, and controlling the carbon source adding pump to add according to the second adding frequency. The operation control precision of the sewage treatment plant can be improved.

The utility model discloses a reflux device capable of quickly adjusting the pH value of an extraction box. The reflux device comprises a washing stage, a first locking knob is vertically mounted on the edge of the front side of a rotating motor, a liquid injector is mounted on the front side of an extraction secondary stage in a communicated manner, a pH dosing tank is mounted at the upper end of the liquid injector in a communicated manner, and a water phase outlet is mounted at the lower end of a raffinate clarification stage in a communicated manner. According to the backflow device capable of rapidly adjusting the PH of the extraction box, the backflow flow can be controlled through the valve, the flow meter and the backflow pipeline section, the PH value is reduced, normal operation of a system can be recovered within two hours, the error correction time of the system is greatly shortened, quantitative medicine injection can be conducted through the PH dosing tank and the liquid injector, the adjusting effect is good, and the cost is low. The height of the stirring block can be adjusted through the lifting support frame and the first locking knob, the mixing effect can be conveniently adjusted, the cover plate can be quickly turned over, opened and closed through the connecting hinge, the sealing ring and the second locking knob, and cleaning and recycling are convenient.