Come and watch how the clean room adjusts the test collection!
The commissioning of the clean room purification project is completed in four steps:
① Preparatory work before commissioning of clean room purification project.
② Single-machine test run of clean room purification project.
③ Linkage debugging of clean room purification projects.
④ Performance test and comprehensive evaluation of clean room.
(1) Preparations before commissioning of clean room purification project
1. Organizational preparation for the purification project commissioning of clean room:
Set up a commissioning team with the design unit, construction unit, and supervision unit as the head of the construction unit (owner). The commissioning team leads the overall work of commissioning, the commissioning team coordinates the relationship between all aspects, and the commissioning team provides various soft and hard conditions for commissioning.
2. Preparation and commissioning outline of clean room purification project
Under the leadership and organization of the commissioning team, prepare a commissioning outline. The commissioning outline is a guiding document for commissioning. The contents of the commissioning outline include: organizational division of labor, government affairs, and material transfer; commissioning projects, commissioning methods, and commissioning instruments; commissioning procedures, commissioning progress, commissioning plans, and so on. The preparation of the commissioning outline enables the commissioning personnel to have a clear mind, a unified understanding, a consistent pace, and neat actions, so that the commissioning work can be carried out smoothly.
3. Quality inspection of clean room construction site.
Under the leadership of the commissioning group, relevant leaders and technical personnel from the construction unit, design unit, construction unit, and supervision unit participated to conduct a comprehensive inspection of the construction site and construction quality. From freezing station, heat exchange station, boiler room, transformer substation, air-conditioning room to cooling, heating, power supply system, air-conditioning purification system and automatic control system. Comprehensive inspection of engineering construction quality from equipment (refrigerators, boilers, pumps, cooling towers, air conditioners, etc.), accessories (valves, tuyeres, mufflers, etc.), pipes and pipelines to insulation, equipment foundations, pipe supports and hangers, etc. . See if the construction is according to the drawings, check the discrepancies with the design drawings, find the construction quality substandard items and investigate the reasons. And fill in the "defect detail list" for construction, processing, installation and other quality issues one by one, put forward suggestions for rectification, and complete the rectification within a time limit (before formal commissioning).
4. Cleaning of air-conditioning equipment and air-conditioning systems in clean room purification projects:
① It is necessary to clean the clean room thoroughly and thoroughly before commissioning. Carefully, comprehensively and thoroughly clean the floor, walls, ceilings, doors and windows of the clean room (preferably ask a professional cleaning company); air-conditioning equipment, air-conditioning pipes (supply air pipes, return air pipes, fresh air pipes), Air-conditioning accessories (silencer, valve, tuyere, etc.) for inspection, leak detection and wiping. Meet cleanliness requirements.
② Install coarse and medium efficiency filters for the first air blow. On the basis of thorough cleaning, install coarse and medium efficiency filters in the air conditioner. Air blowing the entire purification air-conditioning system, the air blowing time is 24-36 hours, so that the entire system is initially purified.
③ Install high-efficiency filters. High efficiency filters can be installed after the system is air blown. Before installation of the high-efficiency filter, it is required to check it one by one and plug the leaker. Leak detection is performed on a temporary leak detection platform, and the dust source uses atmospheric dust. Only qualified high-efficiency filters can be installed. After installation, the installation seal of the high-efficiency filter is leak-tested (scanned with a dust particle counter) to achieve a qualified installation.
④ After the high-efficiency filter is installed and passed the leak detection, the air-purification system is air-blown a second time. The air blowing time is 24 hours before entering the debugging program.
5. Preparation of purification engineering test instruments, meters and tools in clean rooms
① Before commissioning, the instruments and meters used in the commissioning must be commissioned and calibrated (recalibration is required if the usage time exceeds). The instruments used include instruments that measure wind speed, air volume, temperature, relative humidity, pressure difference, noise, vibration, revolutions, time, atmospheric pressure, and cleanliness.
② Preparation of equipment and tools for commissioning. Such as: electrician's tools, plumber's tools, metalworking tools, fitter's tools and climbing ladders. And please ask the construction unit to cooperate with electricians, plumbers, metalworkers and fitters.
③ Preparation of drawings and record forms for commissioning and testing.
(II) Single-unit commissioning of clean room purification project
The stand-alone test run is a test run of all the equipment, accessories and other monomers in the project. The purpose of stand-alone commissioning is to check and assess the installation quality of these equipment and accessories and the quality of products leaving the factory. The main contents of stand-alone test run are:
Water and electricity come first. That is, the equipment and systems for water supply and power supply are first checked and evaluated. Such as pumps, transformers, distribution boxes, switches, etc. To ensure normal and reliable water supply and power supply.
Furthermore, cooling equipment (freezer, cooling tower, chilled water pump, cooling water, etc.), heating equipment (boiler, heat exchanger, hot water pump, etc.), air-conditioning equipment (surface cooler, heater, humidifier, filter, etc.) Equipment, fans, etc.), automatic control equipment, instruments, valves and accessories of each system for individual assessment. See if it can meet the design requirements and normal operation. Especially for rotating equipment such as fans and pumps, it is necessary to test rotation to see whether it runs smoothly, whether there is noise, collision and reverse phenomenon; whether the electrical equipment wiring is correct; whether the refrigerator and boiler can meet the design requirements; the surface cooler of the air conditioner Cooling and dehumidifying capacity, humidifying capacity of humidifier, etc. If malfunctions and problems are found, they should be rectified immediately.
For large-scale equipment such as refrigerators, boilers, air conditioners, etc. (especially imported equipment), it is best to have the manufacturer's commissioning personnel on-site guidance or the manufacturer is responsible for the test run when the single machine is commissioned, and it will be transferred to the user unit after normal operation. The stand-alone test run prepares each individual device for joint debugging.
(3) Coordinated debugging of clean room purification projects
Under normal circumstances, the joint debugging is divided into two phases, namely the air volume distribution phase and the joint debugging phase.
1. Air volume distribution:
The air volume distribution is to adjust the supply air volume, return air volume, fresh air volume, and exhaust air volume of each clean room to the design air volume according to the design requirements. Because a clean plant may have multiple air-conditioning air supply systems and exhaust air systems, or an air-conditioning air supply system shall bear the air supply of multiple clean rooms. Therefore, the air volume distribution commissioning work is a heavy workload, a long time, and a patient and meticulous work. Air volume distribution commissioning work is also the focus of the entire commissioning work. The common air volume distribution debugging method adopts the standard air outlet method.
Standard air outlet method: A clean room may have several or dozens of air-conditioning air supply and return air outlets. Because they are all in communication with each other, when the air volume of one air outlet is adjusted, the air volume of other air outlets will also change with it. Therefore, the standard tuyere method is used.
The so-called standard tuyere method is to open all the valves to the maximum before the air volume is distributed, and find the most unfavorable air outlet among all the air outlets (the air supply with the smallest air supply), and use this air outlet as the standard. tuyere. A monitoring instrument is set on the standard air outlet to test the air volume change of the standard air outlet at any time. Then adjust the air volume of all other air outlets. Because when adjusting the air volume of any air outlet, the air volume of the adjusted air outlet will be affected; therefore, when adjusting the air volume of any air outlet, the current air volume of the standard air outlet shall be used as the reference air volume, so that the air volume of all the air outlets will be The air volume of the standard air outlet changes synchronously.
When a purification air conditioning system is responsible for multiple clean room air conditioners, the commissioning should be performed in the clean room as the unit from the end to the main pipe. For each clean room, first adjust the relative relationship between the amount of air supply and then use the system's The total valve is used to adjust the air supply volume of each air outlet and each clean room to the actual design air supply volume.
2. Linkage debugging of clean room purification projects
The joint debugging is performed after the air volume adjustment and the single machine test run. The joint debugging will purify the air-conditioning system and all the systems that serve the air-conditioning system, namely: the cooling system (freezer, cooling tower, water pump and all accessories on the cooling system), the heating system (boiler, water pump and heating system All accessories), power supply system (distribution box, inverter ...) and automatic control system are all put into operation, and the comprehensive performance and linkage performance of each system are evaluated. If necessary, artificially set a certain amount of load in the clean room to check whether the linkage of temperature and humidity probes, intermediate instruments and actuators is sensitive and coordinated; check whether the temperature and humidity probes are accurate and the accuracy is acceptable.