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1. Project Overview
Shuoyang Packaging Co., Ltd. is located in Dongguan City. The production process is equipped with grinding and polishing procedures. A large amount of dust is generated during the grinding and polishing process, which causes certain pollution to the production workshop environment. The polished workpieces are mainly aluminum products and magnesium hardware products. The dust waste gas has explosion hazards during the production process. To protect the environment, ensure that the surrounding environment of the factory workshop is not polluted and protect the health of employees.
To safeguard the interests of employees and improve the working and surrounding environment, the factory specially entrusts Zhonghuan Lvzhou (Shandong) Equipment Manufacturing Co., Ltd. to compile this design scheme.
2. Pollutants and Hazards
2.1 Main Pollutants
Dust (refers to solid particles suspended in the air).
2.2 Formation and Hazards of Pollutants
Dust: The harm of smoke and dust to human body is related to particle size. Particles larger than 5 microns can be blocked by nasal hair and respiratory mucus. Particles smaller than 0.5 microns generally adhere to the surface of the upper respiratory tract and are discharged with sputum. Particles with a diameter of 0.5-5 microns are the most harmful to human body. They will not only deposit in the lungs, but also directly enter the blood and reach various parts of the human body. Due to various harmful substances attached to the surface of dust particles, inhalation will cause various respiratory diseases.
Dust drifting in the atmosphere often contains many toxic components such as chromium, manganese, cadmium, lead, mercury and arsenic. After human inhalation, particles smaller than 5μm easily penetrate into the lungs, causing toxic pneumonia, silicosis and even lung cancer. Once the pollutants deposited in the lungs are dissolved, they will directly invade the blood and cause blood poisoning. Undissolved pollutants may also be absorbed by cells, resulting in the destruction of cell structure. In addition, dust will pollute buildings and corrode ancient buildings. Dust falling on plant leaves will hinder photosynthesis and inhibit plant growth.
3. Design Basis and Principles
1. Comply with the Environmental Protection Law of the People's Republic of China;
2. Comply with GB16297-1996 Comprehensive Emission Standard of Air Pollutants;
3. Comply with Air Pollutant Control Engineering;
4. Comply with Ventilation and Air Conditioning Engineering;
5. Comply with Code for Construction and Acceptance of Industrial Pipeline Engineering;
6. Guangdong Local Standard DB44/27-2001 Emission Limit of Air Pollutants;
7. Based on on-site environment and factory requirements;
8. Based on previous work experience and reference data of similar manufacturers at home and abroad;
9. Electrical engineering adopts national design specifications and standards:
1) GBJ54-83 Code for Design of Low Voltage Distribution Devices and Lines
2) GBJ50034-93 Code for Lighting Design of Industrial Enterprises
3) GBJ50055-93 Code for Power Distribution of General Electrical Equipment
4. Design Objectives
After treatment, the pollutant emission at the discharge outlet shall meet the second period secondary emission standard of Guangdong local standard DB44/27-2001 Emission Limit of Air Pollutants, and comply with ISO14000 international general standard.
The dust discharge concentration is less than 120mg/m³, and the exhaust funnel is set for high-altitude discharge at 15 meters above the ground.
5. Process Selection, Flow Chart and Description
5.1 Process Selection
In summary, each treatment method has advantages and disadvantages. An excellent treatment process must integrate advantages, avoid disadvantages, and be efficient, practical, low energy consumption and easy to operate.
Practice has proved that a single treatment method cannot achieve efficient treatment effect. Therefore, this scheme adopts combined water spray dust removal process to achieve the best and efficient purification effect.
According to the characteristics of hardware grinding and polishing dust and environmental protection requirements, the water spray dust removal process is adopted for dust treatment.
Zhonghuan Lvzhou (Shandong) Equipment Manufacturing Co., Ltd. is a professional environmental protection company engaged in the design, construction and installation of dust treatment engineering equipment for hardware factories. According to different customer needs in various industries, the company designs satisfactory waste gas treatment schemes.
Consultation Hotline for hardware factory grinding and polishing dust treatment equipment: 158-5314-5085. One-stop service is provided.
