0 Preface
At present, 2/3 of China's power plants are thermal power generation, the main energy source is coal, and lighting electricity accounts for 10% to 12% of the total power generation. According to experts' estimates, from 1996 to 2004, China's green lighting project saved 45 billion kWh, equivalent to 900×10 4 kW installed capacity, equivalent to reducing carbon dioxide emissions by 13 million tons [1]. Lighting is an important part of the safe production of thermal power plants. The scientific and reasonable lighting system can not only provide a bright and comfortable environment for the workplace, but also improve production efficiency and ensure the safety of production and work. At present, in the lighting design of thermal power plants, the design idea of ​​general industrial and mining lighting is still used. It is only considered to meet the basic lighting function requirements, and there is still a distance from the requirements of green lighting. How to use green lighting technology in a large number of new projects is of great significance for improving the working efficiency of production personnel, improving the working environment, reducing the power consumption of power plants, and improving economic efficiency.
1 Green lighting definition and basic requirements
Green lighting is lighting that protects the environment, saves energy, and helps people improve their work and quality of life and protect their physical and mental health. That is to say, through scientific lighting design, lighting products (including light source, electrical accessories, lamps, wiring equipment, dimming control equipment and light control equipment) with high efficiency, long life, safety and stable performance are finally built into environmental protection. Lighting systems that are efficient, comfortable, safe, economical, environmentally friendly and improve the quality of people's work, study and quality of life.
Basic requirements for green lighting:
â— The light source has high luminous efficiency. It mainly includes: high-pressure sodium lamps, metal halide lamps, energy-saving fluorescent lamps and other gas discharge lamps and new LED light sources.
â— It cannot cause harmonic pollution to the power grid. Eliminate the feasibility of thyristor phase shifting and energy saving, and eliminate the feasibility of using electronic ballasts or energy-saving products with harmonic content exceeding 5%.
â— Energy saving. For HID lamps, one is to improve the power factor and reduce the ballast loss; the other is to perform large-scale dimming of the light source, which not only can save a large proportion of energy, but also facilitate the rational use of light sources, protect vision, protect lighting products and lamps. .
â— There is no light pollution.
â— luminaire distribution and optimized design of lamp power [2].
2 Specific application of green lighting in power plant design
According to the definition of green lighting, the following aspects should be considered in the lighting design of power plants: energy saving, improving lighting quality, and optimizing the lighting scheme of the centralized control room. The following is a description of the green lighting design for thermal power generation projects.
2.1 The embodiment of energy saving measures in power plant lighting design
2.1.1 Adopting high-efficiency lighting fixtures
Green lighting should use high-efficiency and high-quality lighting fixtures in Tables 1 and 2.
For cleaner places without protective requirements, open-type lamps should be used first; for places with protective requirements, light-transmitting materials with good light transmission properties and reflective materials with high reflectivity should be used to ensure high efficiency. At the same time, the light distribution curve of the selected luminaire should be adapted to the environment to be illuminated, so that the illuminance of the illuminated surface is uniform, and the illuminance is not concentrated or dispersed. In order to improve the utilization of light source luminous flux, direct and semi-direct type lamps should be selected first in the workshop and workshop.
Now I will introduce the design and application of the first phase of a Huadian power plant as an example:
The slab lamp is selected in the zero meter layer, the 6.9 m layer and the deaerator layer of the steam engine room, and the metal halide lamp is used as the light source. The reflector of the lamp adopts a double-plate structure, and the lamp efficiency is 77%, which is a wide light distribution and a maximum distance. With a height ratio of 1.8 and a protection angle of 24°, the luminaire can be mounted on the column or suspended under the floor. Considering the color rendering index of the metal halide lamp can meet the requirements, a narrow light distribution block light is used in the running layer of the steam engine room, and the light source adopts ZJD400.