On November 9, Haiyang City, Yantai, Shandong Province, officially launched the nuclear energy heating model to ensure that 200,000 people use winter heating, with a heating area of 4.5 million square meters. From coal-fired heating to nuclear heating, Haiyang became the country's first "zero-carbon" heating city.
In the past, coal-fired heating was the main heating method in the winter in northern China, but in recent years, as the amount of coal burning continues to rise, the emission of atmospheric pollutants has increased, causing serious damage to air quality. Since 2017, China has vigorously promoted clean heating in the northern region, and nuclear energy, as a safe and clean energy source, is currently the most economical and safest way to heat up smokeless dust, ash residue and nitrogen oxide emissions.
Different from coal-fired heating, the principle of nuclear energy heating is to extract steam from the second circuit of the nuclear power unit as a heat source, carry out multi-channel isolation and multi-stage heat exchange through the heat exchange station, and finally transfer the heat to the user through the municipal heating pipe network. In this process, only the transfer of heat, no exchange of other media such as water, to ensure that the user heating clean and safe.
As a listed enterprise specializing in pipeline production and research and development, Donghong Co., Ltd. plays an important role in the project. In January 2021, after the bidding process, our company successfully won the bid for the 4.5 million M2 nuclear energy heating pipe network project in the new and old town of Haiyang City, and provided φ720mm-φ1020mm polyurethane spray polyethylene winding prefabricated direct buried insulation pipe and supporting pipe fittings for the project.
Relying on the perfect product logistics system and strong team support, in mid-March, the first batch of insulation pipes was successfully delivered to the construction site to smoothly ensure the construction of the project.
The polyurethane spray polyethylene winding prefabricated direct buried insulation pipe used in the project is our company's advantageous product, which adopts polyurethane spray polyethylene winding in-line molding technology, which replaces the "pipe in the tube" two-step molding technology common at home and abroad in the large and medium pipe diameter, and improves the uniformity of foam density and the consistency of the thickness of the insulation layer.
Two-step process bubbles
Spray winding process bubbles
As can be seen from the above figure, the bubble size of the "spray winding" process is significantly smaller than that of the "two-step method - tube in the tube" process and the density is high, and its oval bubbles increase the radial compressive strength of the polyurethane insulation layer, which further enhances the thermal insulation performance and deformation resistance of the pipe.
After the spray polyurethane foam is completely cured, the outer protective polyethylene layer will be wound, which can effectively eliminate the residual stress of the foaming process, while the outer winding structure has no axial molecular orientation to avoid the possibility of axial cracking.
The whole pipeline production process adopts automated production technology, high standard quality control runs through the whole production process, and quality production helps the project to operate stably.
After the project was put into operation, the nuclear power unit officially replaced the local 12 coal-fired boilers, compared with previous years, it is expected to save 100,000 tons of raw coal, reduce carbon dioxide emissions by 180,000 tons, smoke and dust by 691 tons, nitrogen oxides 1,123 tons, sulfur dioxide 1,188 tons, equivalent to planting 1,000 hectares of broad-leaved forests, and reduce heat emissions to the environment by 1.3 million gigajoules.
Nuclear energy heating not only improves the quality of residential heating, but also improves the atmospheric environment and marine ecological environment of Haiyang City's heating season, Donghong shares as the transmitter of the project to undertake an important mission, but also to help the country to achieve carbon peak carbon neutrality as soon as possible to contribute to The strength of Donghong.
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