The design and installation of the dust-free workshop exhaust system directly affects the rational design of the air flow ventilation and exhaust system in the entire clean room and effectively guarantees the production and living environment in the clean room. Therefore, the design of the exhaust ventilation system is an important part of the purification engineering construction. The material of the air duct and accessories shall be selected according to the engineering design requirements, if the engineering design does not require it.
The selection of the material of the exhaust duct should pay attention to the following conditions:
Exhaust air category→Air duct, accessory material
General exhaust, hot exhaust → galvanized steel
Acid exhaust → PVC board, stainless steel board, coated with tetrafluoroethylene stainless steel
Alkali exhaust, ammonia exhaust → PVC board
Organic exhaust gas exhaust → stainless steel plate, galvanized steel plate
Flammable and explosive materials exhaust → stainless steel plate, galvanized steel plate
(1) The production of exhaust ducts in a dust-free workshop shall comply with the following provisions:
1. The gaskets and fixing materials of flammable and toxic exhaust ducts shall be made of non-combustible materials;
2. The bolts, nuts, washers and rivets used in the duct shall be made of materials that are compatible with the performance of the pipe, do not produce electrochemical corrosion, or use anti-corrosion measures such as galvanizing;
3. The galvanized steel plate shall not be seriously damaged by the galvanized layer, such as large-area white flowers on the surface layer, powdering of the plating layer, etc.;
4. The spacing between the bolts and rivet holes of the duct flange should not exceed 100mm; the four corners of the rectangular duct flange should be provided with screw holes.
(2) When the exhaust duct passes through the fireproof, explosion-proof wall, ceiling or floor, a protective casing shall be provided, and the thickness of the casing steel plate shall not be less than 1.6 mm. The protective casing shall be pre-buried and fixed reliably; the air duct and the protective casing shall be sealed with non-combustible materials. Installation of exhaust ducts shall comply with the following regulations:
1. The exhaust air duct containing flammable or explosive medium or the air duct installed in an explosive atmosphere shall be well grounded;
2. When the exhaust duct passes through the wall, ceiling and ground of the clean room (area), a casing shall be provided and shall be airtight;
3. It is strictly forbidden to cross other pipelines in the exhaust duct;
4. The outdoor exhaust pipe is fixed to the cable, and it is strictly forbidden to connect with the lightning rod or lightning protection net.
(3) The handling and lifting of the exhaust equipment shall meet the following requirements:
1. Handling and hoisting of exhaust equipment should comply with the relevant requirements of the product specification, and do relevant protection work to prevent equipment damage or treatment performance degradation;
2. Before handling and hoisting large and medium-sized equipment, a safe and feasible handling and lifting plan should be formulated according to the equipment dimensions, weight, product specification requirements and safety production requirements, and implemented after approval by the construction unit and project supervision.
(4) The installation of adsorption-type exhaust gas treatment equipment shall meet the following requirements:
1. The foundation of the overall exhaust gas treatment equipment shall be directly placed, and the surface level shall not exceed 2/1000;
2. The verticality of the body of the adsorption device should not exceed 2/1000;
3. The center of the selected main port should be aligned with the installation reference line and the base surface, and the allowable deviation should not exceed 3 mm;
4. Before loading the adsorbent, the inside of the equipment should be purged with clean air to remove debris.
5. Check the effective activity of the adsorbent according to the provisions of the equipment technical documents before loading the adsorbent;
6. After filling and installation, the air tightness test should be carried out according to the design requirements. The test pressure should be 1000Pa and the dwell time should be 10~30min. There should be no leakage or abnormality after inspection.
(5) The installation of wet exhaust gas treatment equipment should meet the following requirements:
1. The foundation of the washing tower and the liquid tank shall have a surface level of not more than 2/1000;
2. The plumbness of the washing tower and the liquid tank should not exceed 1/1000;
3. After the equipment and pipelines are assembled, water is injected to the working liquid level. The air tightness test should be carried out at a pressure of 1000 Pa. The holding time is 30 min. After the inspection, there should be no leakage and abnormal phenomena; then the liquid is operated at the working pressure of the circulating pump. Pipeline strength test, holding time of 20min, no leakage and abnormality after inspection.
(6) The installation of the precipitator shall meet the following requirements:
1. Model, performance parameters, direction of entry and exit should meet the design requirements;
2, the foundation of the dust collector, its surface level should not be greater than 2 / 1000; the verticality of the dust collector shell should not be greater than 1 / 1000;
3. The dust collector installed on site shall be tested for air leakage, and the air leakage allowed at 1500 Pa is 3%;
4. When using the filter dust filter device, the installation and air tightness test should be carried out according to the product specification;
5. The grounding of the bag filter and the electrostatic precipitator housing and auxiliary equipment should be reliable and comply with the relevant standards.
After the installation of the clean engineering ventilation and exhaust system, it is necessary to perform single-machine debugging and joint debugging of the whole system.
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