Operation, Maintenance and Technical Development of TQ-Z Straight Cone Equipment

Operation, Maintenance and Technical Development of TQ-Z Straight Cone Equipment

1. Equipment Overview

The TQ-Z straight cone equipment is core solid-liquid extraction process equipment widely used in pharmaceutical, natural product extraction, food flavor, fine chemical and other industries. It adopts an integrated structure with an upper straight cylinder and a lower cone. The main cylinder is generally made of high-quality SUS304 and SUS316L stainless steel. The complete equipment set consists of a main tank body, jacket heating system, top defoaming device, condensation and cooling unit, oil-water separator, pre-filter, pneumatic slag discharge mechanism, CIP cleaning-in-place system, circulating conveying pipelines and other complete supporting components.

The unique conical bottom structure enables gravity self-flow slag discharge without residual liquid inside the equipment. Equipped with segmented jacket steam heating and bottom direct steam distribution structure, the tank features uniform and stable internal temperature distribution, adaptable to various process modes including water decoction extraction, organic solvent thermal reflux, dynamic circulating percolation and aromatic oil distillation recovery. Complying with GMP clean production specifications, the equipment boasts mature structural design and strong process adaptability, serving as a mainstream standardized process equipment for large-scale and standardized extraction of effective plant components.

2. Graded Maintenance and Systematic Maintenance Scheme

To ensure the long-term stable, safe and compliant operation of TQ-Z straight cone equipment, a four-level standardized operation and maintenance system is adopted, including daily inspection, periodic maintenance, annual overhaul and long-term shutdown preservation. Targeted refined management is implemented for five core vulnerable modules: pressure-bearing components, sealing mechanisms, heat exchange systems, pneumatic actuators and filter components, so as to fundamentally avoid typical equipment faults and production problems such as leakage, heat exchange efficiency attenuation, mechanism jamming and material cross-contamination.

2.1 Daily Operation Inspection (Implemented before and after each shift)

Daily inspection is the foundation for stable equipment operation, with comprehensive inspections standardized before startup and after shutdown of each shift. First, inspect the pressure and temperature control system. Record the jacket steam pressure, internal tank working pressure and temperature gauge readings in real time and compare with process set parameters. In case of abnormal pressure fluctuation, timely check the operating conditions of steam pressure reducing valves and condensate water drain valves. Inspect the explosion-proof sight glass, pressure gauge and temperature transmitter interfaces for liquid leakage, ensure the integrity of instrument pipeline insulation layers, and discharge jacket condensate water in a timely manner to avoid local low temperature and reduced heat exchange efficiency caused by water accumulation. Second, inspect the pneumatic slag discharge mechanism. Check the smooth operation of the slag discharge door, keep the air supply pressure of locking and opening cylinders stable at 0.6 to 0.7MPa, and ensure no jamming or foreign blockage of self-locking wedge blocks and roller sliding structures. Verify the reliable action of the safety pin interlock device, and prohibit pressure feeding when the safety lock is unlocked. Clean residual medicinal residues on the cone bottom joint surface and main sealing ring regularly to eliminate liquid leakage risks. Third, clean pipelines and filter units. Start the CIP rotary cleaning ball for preliminary tank cleaning after operation, dredge circulating discharge pipelines and duplex filters, and check the condition of the double-layer filter sieve plate at the tank bottom. Adopt compressed air back-blowing to clean blocked filter screens, and add hot water circulating flushing for viscous material extraction processes to prevent filter hole scaling and carbonization. Fourth, confirm auxiliary equipment operating conditions. Monitor the temperature difference between inlet and outlet cooling water of condensers and coolers to ensure stable cooling water flow; check the normal liquid level of the oil-water separator without emulsified liquid accumulation, and verify the circulating conveying pump operates without abnormal noise, vibration or mechanical seal leakage.

2.2 Periodic Regular Maintenance (Weekly, Monthly and Quarterly Maintenance)

Weekly maintenance focuses on the maintenance of sealing parts and clean structures. Regularly disassemble and inspect the special-shaped pressure-bearing sealing ring of the slag discharge door, which features enhanced tightness under higher pressure. Replace the ring immediately if surface hardening, cracks or solvent swelling deformation occur. Disassemble and clean the baffles and filter screens of the top defoamer to completely remove foam attachments and avoid secondary pollution. Fully fasten all fasteners of tank flanges and pipeline clamps to compensate for bolt relaxation caused by temperature alternation, ensuring equipment sealing and structural stability.

Monthly maintenance focuses on the upkeep of heat exchange and pneumatic systems. Regularly detect scale and rust accumulation inside the jacket heat exchange cavity, and perform food-grade weak acid circulating descaling under hard water working conditions to restore the effective heat exchange area of the equipment. Drain water from pneumatic triplets, replace air filter elements, and apply food-grade special grease to cylinder piston rods to ensure smooth operation of pneumatic mechanisms. Disassemble and clean CIP rotary cleaning nozzles to achieve 360° dead-angle-free tank spraying and cleaning. Regularly calibrate pressure gauges, temperature sensors and other measuring components to ensure accurate process parameter collection and controllable production.

Quarterly maintenance focuses on structural wear and pressure performance detection. Lift the slag discharge door to inspect deformation of the double hinge support structure and wear of pin shafts, and replace bushings in time if the pin shaft clearance exceeds the standard. Comprehensively inspect welds and transition fillet areas of the cone section tank for stress corrosion, pitting and other defects, and perform polishing and passivation repair on damaged stainless steel passivation layers. Lubricate circulating pump bearings and detect motor insulation resistance to ensure the safety and stability of equipment mechanical and electrical systems.

2.3 Annual Overhaul (Planned Shutdown Maintenance)

Annual overhaul is the core guarantee for long-term equipment operation, covering comprehensive compliant inspection and in-depth maintenance. Firstly, conduct pressure vessel compliance inspection. Entrust a special equipment inspection institution to carry out hydraulic tests on the tank jacket and cylinder, and issue a compliant annual inspection report to ensure the equipment’s pressure-bearing operation meets national special equipment standards. Secondly, perform full internal disassembly and inspection of the equipment. Take out the double-layer tank bottom filter plate for laser cleaning to thoroughly unclog filter holes, replace damaged filters with wear loss exceeding one third, and integrally polish the tank inner wall to repair pits and defects caused by material adhesion. Meanwhile, conduct in-depth maintenance of auxiliary equipment: perform tube cleaning for condenser tubes to remove oil scale and water scale, sandblast and passivate the inner wall of the oil-water separator, disassemble and grind the sealing surfaces of all pneumatic valves and stop valves, fasten control cabinet circuits, and complete explosion-proof electrical insulation detection. Finally, optimize and standardize the pipeline system, replace all aging hoses with sanitary hard pipes, and standardize the layout of transfer interfaces to effectively reduce pipeline sanitary dead angles.

2.4 Long-term Shutdown Preservation (Shutdown for More Than 7 Days)

Standardized preservation is required for long-term equipment shutdown to avoid idle aging and corrosion failure. Firstly, complete full-machine CIP cleaning, followed by rinsing with hot water and purified water in sequence, and hot-air dry the tank and internal pipelines to ensure no residual liquid or moisture. Leave a tiny gap on the slag discharge door to prevent permanent deformation of the sealing ring under long-term compression, and perform dust-proof wrapping protection for cylinder piston rods. Completely drain accumulated water from jackets and cooling water pipelines, and dry pipelines with compressed air to prevent winter cracking and internal corrosion. Cover the electrical control cabinet with moisture-proof and dust-proof materials, wrap the whole equipment with a dust cover, and manually open and close the slag discharge door once a month to prevent rusting and locking of hinges and locking mechanisms, ensuring normal restart conditions.

2.5 Operation Taboos and Fault Prevention

Standard operating specifications must be strictly followed during equipment operation and maintenance to avoid equipment damage caused by irregular operations. Do not forcibly close the slag discharge door under insufficient air supply pressure to prevent fracture of self-locking wedges and extrusion damage of sealing surfaces. It is prohibited to directly close the cone bottom slag discharge door with residues or hard sundries to avoid permanent leakage defects caused by scratches on the main sealing surface. The jacket steam pressure shall never exceed the design rated value of 0.3MPa to prevent stress overload deformation of the cone cylinder. Complete solvent replacement and thorough cleaning before shutdown under organic solvent working conditions to avoid accelerated aging of rubber seals caused by long-term solvent immersion.

3. Future Technical Development Direction of TQ-Z Straight Cone Equipment

Against the background of industrial upgrading featuring intelligent manufacturing, green production and high-grade clean manufacturing, the technical iteration of TQ-Z straight cone equipment focuses on five core directions: intelligent operation and maintenance, green low-carbon energy saving, clean and sterile upgrading, flexible process adaptation and long-life structural optimization, continuously adapting to the production upgrading needs of high-end fields such as biomedicine, refined natural product extraction and green chemical industry.

3.1 Implementation of IoT-based Predictive Intelligent Operation and Maintenance System

The traditional periodic passive maintenance mode will be fully upgraded to condition-based predictive maintenance. By installing IoT sensors for vibration, temperature, pressure and flow at the tank cone section, jacket and slag discharge mechanism, the PLC control system is linked with edge computing modules to collect core operating parameters in real time, including equipment heat exchange efficiency, cylinder action curve, micro sealing leakage data and pipeline flow status. Intelligent algorithms accurately predict potential faults such as sealing ring aging, filter screen blockage, heat exchanger scaling and hinge wear, and automatically generate standardized maintenance work orders, eliminating excessive maintenance caused by regular forced part replacement and reducing comprehensive maintenance costs by more than 25%. Meanwhile, full-process equipment process data and operation and maintenance records are stored in the cloud, fully meeting GMP data traceability and audit requirements of the pharmaceutical industry. The supporting human-machine interface realizes remote parameter adjustment, fault acousto-optic early warning and interlock protection for abnormal shutdown, greatly reducing on-site manual operation intensity and realizing unattended and intelligent equipment management.

3.2 Optimization of Energy-saving Structure and Heat Recovery Technology

Future equipment will realize green and low-carbon upgrading focusing on three dimensions: waste heat recovery, structural energy consumption reduction and frequency conversion energy saving. First, multi-stage waste heat recovery and reuse transformation. Recover secondary steam condensation waste heat generated in the extraction process, and preheat feeding solvent through plate heat exchangers to significantly reduce jacket steam consumption. Meanwhile, closed recovery and reuse of condensed water is realized to save both water resources and heat energy, reducing overall steam energy consumption by 18% to 22%. Second, composite heat preservation and structural optimization. Adopt a composite structure of high-density aluminum silicate insulation layer and mirror stainless steel shield to reduce cylinder surface heat dissipation loss. Optimize the cone bottom steam distribution structure through fluid simulation and adopt a uniform porous steam distribution plate to eliminate local overheating and medicinal liquid coking, shortening the heating cycle while ensuring extraction rate. Third, intelligent frequency conversion configuration for auxiliary equipment. Install frequency conversion drive systems for circulating delivery pumps and cooling water pumps to automatically adjust operating speed according to tank material concentration difference and equipment cooling load, eliminating electric energy waste caused by constant-frequency and constant-speed operation and realizing precise energy saving.

3.3 High-grade Clean and Sterile Structural Upgrading

Targeting high-clean production scenarios such as sterile traditional Chinese medicine preparations, bioactive raw materials and high-end medical beauty raw material extraction, the equipment will continue iterative optimization of sterile structures. The tank inner wall adopts high-precision electrolytic mirror polishing technology with surface roughness Ra≤0.4μm. All welds adopt rounded seamless welding technology with no internal protruding structures, fully adapting to integrated CIP cleaning-in-place and SIP sterilization-in-place processes to achieve dead-angle-free internal cleaning. The slag discharge door sealing structure is upgraded to fully covered fluororubber sanitary sealing, resistant to high-temperature steam sterilization and acid-base cleaning, eliminating rubber precipitate contamination of material liquid and ensuring material cleanliness. The overall equipment frame and support legs adopt inclined flow guide design with no water or dust accumulation on the surface, adapting to regular wet disinfection in clean workshops and meeting high-end sterile production environment standards.

3.4 Modular Flexible Customization and Integrated Integration

The equipment adopts a modular design concept of standardized main unit plus multi-functional modules. On the basis of retaining the classic TQ-Z straight cone tank structure, functional modules such as bottom stirring, ultrasonic assisted extraction, microwave assisted heating and countercurrent continuous extraction can be flexibly installed, enabling a single equipment to support multiple process modes including traditional static extraction, dynamic forced circulation and external field enhanced assisted extraction. It can quickly adapt to different production scenarios of laboratory bench scale, pilot scale and industrial mass production to realize flexible production. Meanwhile, intensive integrated design of multi-tank groups is promoted. Multiple equipment share centralized condensation, refrigeration, vacuum and CIP utility systems to standardize workshop pipeline layout, effectively reduce equipment floor area, avoid repeated investment in utility equipment and improve the overall integration and operation efficiency of production lines.

3.5 Application of New Corrosion-resistant and Long-life Materials

For special corrosive working conditions such as high acidity, high alcohol and high salinity, equipment structural materials are continuously upgraded. Duplex stainless steel 2205 and Hastelloy composite plates are optional for cone cylinders and core filter components, with pitting corrosion and intergranular corrosion resistance more than three times higher than conventional 316L stainless steel, suitable for long-term continuous production under complex corrosive working conditions. High-frequency moving parts such as equipment hinges and pin shafts adopt tungsten carbide spraying surface strengthening treatment, increasing wear service life by 50% and greatly reducing structural maintenance frequency. Non-metal vulnerable parts such as seals and filters adopt modified PTFE and perfluoroelastomer to replace traditional nitrile rubber, adapting to strong polar organic solvent immersion environments. The replacement cycle of sealing parts is extended from 3-6 months to more than 12 months, effectively reducing equipment maintenance costs and shutdown frequency.

3.6 Adaptation Transformation for Continuous Extraction Process

The traditional batch intermittent production mode is gradually iterated to continuous production. TQ-Z straight cone equipment undergoes targeted structural adaptation transformation, optimizing cone bottom discharge and top feeding structures. It can be connected with continuous material conveying and precise solid-liquid separation units to realize continuous herb feeding, automatic continuous slag discharge and stable continuous material liquid discharge, completely eliminating batch production intervals and significantly improving production efficiency. The overall equipment capacity is increased by more than 40%, fully adapting to the supporting needs of standardized and intelligent continuous production lines for large-scale plant extracts.

4. Conclusion

The stable and efficient operation of TQ-Z straight cone equipment relies on a standardized and graded refined maintenance system. The core focus is the normalized management of cone pressure-bearing sealing mechanisms, heat exchange systems and core filter components, which can effectively extend the overall equipment service life, stabilize extraction process quality and reduce full-life-cycle operation and maintenance costs. Against the backdrop of high-quality industrial development, the technical iteration of the equipment centers on five core directions: intelligent predictive maintenance, green energy conservation and consumption reduction, high-grade clean sterility, flexible modular adaptation and long-life corrosion resistance optimization. Through continuous structural optimization, technical upgrading and intelligent transformation, the mature traditional straight cone extraction equipment can continuously adapt to the high-end production needs of biomedicine, green fine chemical industry and deep processing of natural products, maximize the full-life-cycle application value of equipment, and provide core equipment support for standardized, intelligent and green production in the industry.

Jinzong Enterprise has been focusing on the design and manufacturing of chemical, food, and pharmaceutical machinery and equipment, the development of intelligent control systems, and engineering design and installation for over 20 years. The company has a design and marketing service center in Guangzhou and operates two production factories in the Zhaoqing National High-tech Zone. Jinzong holds the qualification for manufacturing special equipment pressure vessels and the pressure piping installation qualification (GC2). It is a National High-tech Enterprise and a Provincial Specialized and Sophisticated “Little Giant” Enterprise. The company has established a Provincial Engineering Technology Research Center and owns two Guangdong Provincial Famous Brand Products, as well as dozens of product patents, software copyrights, and provincial high-tech products. Jinzong has passed the National Intellectual Property Management Standardization Certification, ISO9001:2015 International Quality System Certification, and EU CE Certification. For many consecutive years, it has been rated as a “Guangdong Province Contract-abiding and Promise-keeping Enterprise” by the Guangdong Provincial Administration for Industry and Commerce. Its customers are spread across more than 50 countries and regions worldwide, and it has gained recognition and support from over 2,000 enterprises both domestically and internationally. As the saying goes, “A craftsman must sharpen his tools to do a good job.” Jinzong Enterprise, adhering to the philosophy of “Quality as Gold, Craftsmanship as Our Core,” provides advanced and automated production lines to manufacturing factories. Domestic and overseas friends are warmly welcome to visit and guide us!