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While rapid industrial development has boosted economic growth, it has also brought noise pollution. Workers exposed to high-noise environments for extended periods not only suffer physical and mental health damage but also experience a significant decrease in work efficiency. To provide a quiet working environment, reasonable and effective sound insulation and noise reduction measures can effectively reduce the impact of noise, improve the quality of the working environment, and protect the health and safety of employees.
01. Noise Control Objectives
Comprehensive noise control measures will be implemented for the steam turbine generator set, including the turbine, reducer, generator, exciter, and piping. Soundproof enclosures will be installed to ensure that noise levels in the work area meet the requirements of the "Hygienic Standards for Industrial Enterprise Design," meaning that employee noise exposure time will not exceed 85 dB(A) over an 8-hour period. Sufficient maintenance space must be reserved in the design, and ventilation equipment must be installed to ensure good equipment ventilation. Furthermore, the temperature of the turbine bearings and generator set after the modification must not exceed the pre-modification values.
02. Design Basis and Standards
2.1 Design Basis
(1) Documents and design drawings provided by the owner and the design firm;
(2) Relevant information on similar noise control projects in China.
2.2 Relevant Laws, Regulations and Standards
Industrial Enterprise Boundary Environmental Noise Emission Standard (GB12348)
Environmental Noise Quality Standard (GB3096)
Industrial Enterprise Noise Control Design Code (GB/T50087)
Regulations for the Architectural Design of Compressor Plants (HG/T20673)
Fire Protection Design Code for Buildings (GB 50016)
Code for Design of Building Structures (GB 50009)
Code for Seismic Design of Buildings (GB 50011)
Code for Design of Steel Structures (GB50017)
Ventilation silencer (HJ16)
Technical requirements for silencers for wind turbines (JB/T 6891)
Hygiene Standard for Industrial Enterprise Design (GBZ1)
Occupational Exposure Limits for Hazardous Factors in the Workplace (Physical Factors) (GBZ 2.2)
"Measurement of Noise Based on Physical Factors in the Workplace" (GBZ/T 189.8)
03. Unit Noise Source Analysis
1. Steam turbine noise
When high-pressure, high-temperature steam passes through a regulating valve, the valve ball seal may be compromised due to poor valve manufacturing quality or long-term corrosion, resulting in steam leakage and thus generating loud noise.
2. Generator noise
Generator noise consists of three main parts: electromagnetic noise, aerodynamic noise, and mechanical noise.
3. Pipeline noise
Pipeline noise includes aerodynamic noise and pipeline vibration noise, mainly in the low to medium frequency range.
04. Noise Control Plan
Installing an integrated soundproof enclosure on steam turbine-related equipment can effectively reduce the noise radiation impact on the outside of the enclosure during the operation of the steam turbine generator set, and also reserve maintenance space and passageway to ensure sound insulation effect.
05. Significance of Noise Control
With the development of society and the economy, enterprises are paying increasing attention to the working environment of their employees. Noise is one of the main influencing factors in the working environment of industrial and mining enterprises, making sound insulation and noise reduction particularly important. By adopting reasonable and effective sound insulation and noise reduction solutions, selecting suitable materials, and carrying out safe and scientific installation, noise pollution in the working environment can be effectively reduced, thereby improving the office environment and work efficiency of enterprises.