The pressure difference monitoring of chemical high-temperature reactors is fully compatible with high-temperature differential pressure transmitters. Conventional differential pressure instruments, limited by high temperatures, vibration, and corrosion, cannot meet the long-term stable measurement and control requirements. The Longlv PTL801H high-temperature differential pressure transmitter relying on professional high-temperature isolation design, perfectly matches the complex working conditions of high-temperature reactors, achieving 24-hour uninterrupted digital pressure difference monitoring. It shifts from manual timing inspection to online early warning, stably controls the reaction process parameters, and avoids production failures and safety risks caused by overpressure and blockage under high-temperature conditions. It is a reliable supporting instrument for automatic monitoring of chemical high-temperature reaction equipment.

1. Industry pain points of pressure difference monitoring for high-temperature reactors

During the operation of high-temperature chemical reactors, there are multiple severe operating conditions, making it difficult for ordinary differential pressure instruments to work stably. The high temperature of the materials inside the reactor and the continuous heat conduction from the reaction exotherm can easily cause zero drift and measurement inaccuracy in the sensing elements of conventional transmitters due to high temperature effects. The medium disturbance caused by stirring inside the reactor and the frequent switching between gas and liquid phases can lead to drastic fluctuations in pressure difference values. Some reaction media are corrosive and prone to crystallization, and ordinary pressure guiding structures may also encounter blockage and leakage issues.

Simultaneously, pressure difference is a core parameter for controlling reaction safety: By observing the pressure difference changes at the inlet and outlet of the reactor and between the upper and lower ends of the reactor, hidden dangers such as material level, internal filter blockage, excessive gas evolution, and pipeline blockage can be identified. Ordinary instruments can only provide rough observations in the short term and cannot provide long-term online accurate warnings. Therefore, it is necessary to use high-temperature differential pressure transmitters specifically adapted to high-temperature conditions.

II. Core Advantages of Longlv PTL801H High-Temperature Differential Pressure Transmitter for Reaction Kettles

 High-temperature isolation structure, shielding the sensing core from high-temperature damage

 A dedicated thermal insulation and isolation structure is designed for the high-temperature medium in the reaction kettle, blocking the conduction of high-temperature heat to the internal sensing unit. This ensures that the core measuring components are always maintained within a suitable operating temperature range, effectively addressing issues such as data drift and component aging and failure caused by high temperatures. It is suitable for long-term uninterrupted monitoring of high-temperature reaction processes.

 Resistant to vibration and medium disturbance, with stable differential pressure readings

 The continuous operation of the reactor stirrer brings high-frequency vibration, and the gas-liquid reaction generates instantaneous pressure pulses. This transmitter incorporates a multi-signal compensation mechanism that can filter out instantaneous pressure fluctuations, preventing numerical jumps. It accurately captures slowly changing steady-state pressure differences and avoids frequent false alarms.

 Anticorrosion sealing structure, suitable for chemical corrosive media

 The contact medium parts of the entire machine are made of corrosion-resistant stainless steel, paired with high-temperature dedicated sealing components, to withstand the erosion of chemical media such as acids, alkalis, solvents, and high-temperature steam. The dual pressure measuring interfaces are sealed securely, eliminating the risk of high-temperature medium leakage, and are suitable for various high-temperature synthetic reactors in fine chemical and coal chemical industries.

 Integrate with the central control system to achieve fully automated pressure difference management and control

 It outputs standardized universal industrial signals that can be directly connected to DCS and PLC control cabinets. The central control panel displays real-time pressure difference values and historical curves in real time. Based on the reaction process, multiple pressure difference thresholds are set. When the pressure difference exceeds the threshold, automatic audible and visual alarms, pressure relief, and feeding interlocking are triggered to ensure the safety of high-temperature reaction production.

 Strong installation adaptability and simple modification

 It supports standard threaded pressure tapping installation and can also be paired with remote capillary flanges to accommodate high viscosity and easily crystallizing material conditions, without requiring large-scale modifications to the original reactor piping. The equipment has a compact structure, allowing for smooth installation in narrow reactor spaces, and facilitating easy disassembly, calibration, and maintenance in the later stages.

III. Implementation Plan for Standardized Monitoring of Pressure Difference in High-Temperature Reactors

 The pressure tapping points are arranged reasonably

 Monitor the pressure difference of liquid level in the reactor: The pressure tapping points are set up in the gas phase area at the top and the liquid phase area at the bottom of the reactor. Monitor the pressure difference of the circulating feed filter screen: Pressure tapping ports are opened before and after the filter in the feed pipeline, which are connected to the high and low pressure ends of the transmitter respectively. The pressure tapping ports are kept away from the vortex area of the stirrer to ensure uniform pressure transmission.

 Equipped with auxiliary cooling and buffering components for further stability testing

 Install a condensation buffer bend in the pressure guiding pipeline to extend the heat conduction path and further reduce the temperature of the medium transmitted to the transmitter. The pipeline is arranged with a slight inclination to prevent the medium from crystallizing and residue from accumulating and blocking the pressure guiding channel.

 Setting of graded pressure difference warning

 Mild warning: The pressure difference deviates from the daily benchmark range, indicating a shift in material level and slight accumulation on the filter screen. Arrange for intermittent downtime for maintenance and cleaning;

 High-risk interlock alarm: When the pressure difference reaches the process safety threshold, the system automatically triggers audible and visual alerts, and simultaneously shuts off the feed and opens the pressure relief valve to prevent overpressure and leakage safety accidents.

 Regular operation and maintenance ensure long-term stability

 Periodically purge the pressure impulse piping to remove crystallization and sedimentary impurities; calibrate the transmitter zero point according to the operating condition cycle, continuously maintain measurement accuracy under high temperature conditions, and significantly reduce the probability of instrument downtime due to malfunctions.