Sewage treatment plants and waterworks have large-scale water treatment pools, and sewage treatment plants have a relatively large annual electricity consumption. The photovoltaic power generation project uses the roof of the sewage treatment plant, the sedimentation tank, the biochemical pool and the contact pool to install solar energy on it, which has a unique space advantage.
(1) Rich land resources. The water treatment plant has a large area of water treatment tanks. The installation of solar photovoltaic panels on it has a unique space advantage. It can be used for secondary development of the occupied land of a large-scale water treatment plant, and can be used for intensive land. The effect of comprehensive utilization of land.
(2) High energy-consuming industries. Sewage treatment plants and waterworks have high electrical loads, are large energy consumers, and operate continuously for 24 hours. The load is stable. The power generated by PV power plants can basically be absorbed by the power consumption of water treatment plants, which is in line with “spontaneous use”. mode. In the direct production cost of water treatment plants, electricity consumption accounts for more than 30% of the cost, and the demand for cost reduction and efficiency is strong. The combination of photovoltaic and water treatment and the implementation of contract energy management can further reduce the cost of sewage and tap water treatment.
(3) Good stability. Sewage and tap water treatment facilities are public infrastructures, with long service life and low risk of outages. They are distributed in relation to other types of urban building roofs and have good investment stability.
(4) The water treatment field itself covers the demand. Due to the needs of the process, some water treatment tanks need to be covered to inhibit the growth of algae, and the construction of the grid above the pool surface is in line with its own capping requirements.
In summary, the construction of solar power in sewage/water treatment plants has the advantages of intensive land use, self-use, high electricity load, local consumption, good stability, good financing environment, and perfect combination with the production process of water treatment plants. The state has provided strong policy support and economic subsidies for the construction and use of solar power in the power load zone.
However, compared with the ground power station, the water treatment plant environment is relatively harsh. First, the humidity is high, and the product is easy to be oxidized. Second, the motor is large and the power grid environment is poor. The cost of installing photovoltaics is higher, the bracketing scheme and the electrical scheme, as well as the cable laying, are different from conventional ground power plants. Be serious and carefully designed.
1 water plant humidity is large
All parts must have strong anti-rust measures, the components should be double-glass components as much as possible, and the anti-corrosion measures of the brackets should be in place. Electrical equipment such as inverters and combiner boxes should be as far away from the water as possible.
2 water plant grid environment is poor
There are many water pumps in the water plant, and there are many large motors. The instantaneous current is 3-5 times of the rated current when starting. When selecting the inverter, choose the inverter with fast response. In addition, it is necessary to select the inverter with high power as much as possible. When the absolute value of the harmonic current is constant, the larger the inverter, the greater the ability to prevent current surge.
In order to ensure that each inverter adapts to harsh environments such as high humidity and poor grid environment, Guruwatt has established strict quality control of five quality engineering projects: design engineering, test engineering, manufacturing engineering, device engineering, environment and reliability engineering. system. Its more than a thousand inspection items are enough to prove its severity. In the process of design and development, it is required to go through “six-party proposal, three-tier argumentation, and four-way review”; for each new product, it requires hundreds of verifications and various long-term tests to simulate real harsh environments; "Select", all the first-line brands of key components; reasonable configuration and specification requirements for production processes and process operations, strict implementation of product process quality; use of scientific information systems to control product quality dynamics... higher than national standards, industry standards, The internal standards of international standards, as the basic requirements for products to enter the market, provide quality products to consumers around the world.