1. introduction of polyurethane insulation pipe
polyurethane insulation pipes are mainly used in the following aspects in daily production and life: urban central heating and cooling; transportation of oil and natural gas; laying of industrial pipelines and cryogenic transport of liquefied natural gas. generally speaking, the polyester insulation pipe consists of three layers from the inside to the outside: the working steel pipe layer, the polyurethane insulation layer, and the high-density polyethylene protective layer. it has the advantages of anti-corrosion, good insulation performance, long service life, small footprint, fast construction, and environmental protection. especially in the cold winter, the role of polyurethane insulation pipes will become more important.
the direct-buried thermal insulation pipe is a kind of direct-buried prefabricated thermal insulation pipe with good thermal insulation performance, reliability and low engineering cost. polyurethane direct-buried insulation pipes have good mechanical properties and thermal insulation properties. usually, they can withstand a temperature of 120°c, and can withstand a temperature of 180°c through modification or combination with other insulation materials. polyurethane prefabricated direct-buried thermal insulation pipes are pre-ordered, which is beneficial to the actual production and life of thermal insulation pipe applications. it has great flexibility and adaptability, and direct-buried thermal insulation pipes with different parameters can be designed according to different needs. in the current field of technical facility construction, many construction companies use polyurethane direct-buried insulation pipes in the process of underground pipe network construction. compared with the traditional way of laying trenches and overhead pipelines, the laying efficiency of polyurethane direct-buried thermal insulation pipes is high and has good social benefits.
second, the current situation of central heating in cities in my country
in recent years, with the acceleration of urbanization and people's gradually deepening understanding of resources and environmental protection, as a heating system strongly supported by my country at this stage forms, the scope and scale of urban central heating continue to expand, which also drives the development of urban central heating pipelines. urban central heating mainly refers to the supply of heat for life and production to users in the city or a certain area through the heating pipe network from the centralized heat source in the city, with steam or hot water as the medium, also known as district heating, which is an urban energy source. an infrastructure built.
1, heating area
in the new era, with the continuous development of my country's economy, the acceleration of urbanization, and the improvement of people's living standards, urban heating has developed rapidly, especially the demand for central heating in cities is gradually increasing. from 2017 to 2021, the urban heating area will gradually increase. according to data from the national bureau of statistics, in 2021, my country's urban central heating area will be 10.603 billion square meters, a year-on-year increase of 7.3%.
figure 1 2017-2021 my country's urban central heating area and year-on-year growth rate (unit: 100 million square meters)
2, heating pipe length
while the central heating area in chinese cities is increasing, the length of heating pipelines is also increasing. according to data, in 2017, the length of central heating pipelines in chinese cities was 276,300 kilometers, and it will increase to 461,500 kilometers in 2021.
fig. 2 length of central heating pipelines and year-on-year growth rate in cities in my country from 2017 to 2021 (unit: 10,000 kilometers)
third, related policies
urban central heating is a part of my country's municipal public utilities, and one of the basic tasks of my country's urban economic construction and urbanization development and construction. it is a key factor that is directly related to social public interests, affects the quality of life of the broad masses of the people in our country, and is related to the sustainable development of urban economy and society. policy is the wind vane of urban heating construction. as a social and people's livelihood service, urban heating is mainly led by the government. in order to continuously improve the quality of life of urban residents, promote the healthy, sustainable, and steady development of the heating industry, and make every effort to ensure that the masses are warm, comfortable, and safe in winter, my country has issued many policies in recent years.
2022 in march 2018, the ministry of housing and urban-rural development issued the "14th five-year plan for building energy conservation and green building development", which pointed out that in severe cold areas, building energy efficiency renovations and heating pipes should be continuously promoted heat preservation and intelligent control. in july 2022, the national development and reform commission issued the "implementation plan for new-type urbanization during the 14th five-year plan", which clearly pointed out the promotion of aging and renovation of urban heating pipelines. cities around the world have also formulated relevant heating policies according to local conditions, mostly in the northern regions. in august 2022, jilin province issued the "jilin province's "14th five-year plan" comprehensive implementation plan for energy conservation and emission reduction", which combined with the renovation of old residential areas in cities and towns, continued to implement the renovation of municipal infrastructure such as old heating pipe networks; tianjin may 2022 promulgated the "tianjin "14th five-year" energy conservation and emission reduction work implementation plan" to promote clean heating according to local conditions, implement the renovation of the heating pipe network, and improve the energy efficiency of the heating system.
polyurethane insulation pipe has the following advantages: lower engineering cost; low heat loss, energy saving; anti-corrosion, good insulation performance, long service life ;small area occupation, fast construction, and favorable for environmental protection; an alarm system can be set up to automatically detect leakage faults in the pipe network, accurately indicate the fault location and automatically alarm. the above advantages are in line with the requirements of relevant government policies, and are the best choice for urban heating pipelines in winter.
driven by market demand and related policies, urban heating has maintained rapid development. in winter, people's demand for heating is also gradually increasing. the continuous release of heating demand will drive the increase of polyurethane consumption and promote the application of polyurethane materials in heating and heat preservation pipelines.
