World´s largest solar district heating plant with concentrating collectors

World´s largest solar district heating plant with concentrating collectors

The Chinese parabolic trough collector manufacturer Inner Mongolia XuChen Energy  has successfully operated a huge solar district heating plant since 2016 in a village near Baotou in Inner Mongolia, an autonomous region of China. Yu Wang, General Manager of XuChen, said that there is growing demand for solar heat from China’s northern provinces thanks to the central government’s green heat policy. The installation in Baotou consists of two fields of parabolic trough collectors, a 22,000 m2 rooftop field on XuChen's factory hall next to the company’s headquarters (left) and a 71,000 m2 system put up at ground level. The 93,000 m2 (65 MWth) SDH plant is the world’s second-largest after Denmark’s Silkeborg (110 MWth) installation but the biggest using concentrating collectors.
Photos: sohu.com, one of China’s major online news portals
 
“We spent eight years developing the solar concentrating technology for district heating and 59 patents are connected to this development together with more than 100 independent IP rights,” Wang said in a report published on 30 April on cnste.org, the website of the Chinese National Solar Thermal Alliance. XuChen, founded in spring 2016, invested Renminbi (RMB) 1.05 billion, i.e., USD 154.7 million, in putting up headquarters as well as a 50,000 m2 factory for parabolic trough collectors in Baotou’s green industrial park. 
 
A bird’s eye view of the 71,000 m2 parabolic trough solar system installed on the ground near Baotou, Inner Mongolia, China.  Photo: XuChen
 
The 93,000 m2 solar plant is part of the government’s green heat policy to improve air quality in China’s northern provinces and phase out coal boilers. This policy is part of the overall trend to improve social living conditions and provide affordable housing which is summarized under the slogan “livelihood”- a term created by the Chinese government.

Wang confirmed that the installation of the solar plant in Baotou is the first livelihood project introducing solar space heating to the region. “The government has completely taken over the RMB 0.55 billion in capital costs for the solar field, including the storage tank and the newly built heat network,” Wang explained in an interview with solarthermalworld.org. This 100 % public subsidy was what prompted XuCheng's investment in a collector factory in the same city.
 
He added that only one person is needed in the central control room of the solar thermal plant in Baotou. Another employee is in charge of operating the drone that monitors mirror performance. The drone’s infrared sensors can detect points of thermal imbalance across the field in time, so they can be solved immediately. The mirrors have so far been cleaned by hand, but XuChen has already started working on an automated system. You find technical and financial data about the Baotou project in the table at the end of the article.
 
Solar heat transported to nearby heat consumers by truck
Wang said that he has observed an increase in solar heat demand from China’s northern provinces. He added that surplus heat generated in summer, when none of the buildings connected to the SDH system require space heating, is transported by truck to nearby consumers, including hotels, swimming pools and spas. As China’s green heat policy requires the phase-out of coal boilers and because heat pumps rack up high electricity bills, purchasing solar heat from Baobou's SDH plant is an economically viable option for those requiring large amounts of heat all year round.
 
 
Yu Wang, General Manager of XuChen (front) during the announcement of his second solar district heating plant in the Chinese town of Han Dan Photo: XuChen
 
Another huge solar district heating system is currently being built by XuChen in Han Dan, in the north of China. According to Wang, this plant will provide heat to a new all-weather, four season ecotourism vacation and leisure park. Due to the green heat policy of the government the construction of the leisure park would not have been possible without a source of clean energy for heating, in this case provided by SDH. “Our investment will support the development of new urbanisation and modern tourism and will service industries in Han Dan City”, says Wang.  
 

Aperture area of ground-mounted parabolic trough solar field

71,000 m2

Aperture area of rooftop parabolic troughs

22,000 m2

In operation since

October 2016 (ground-mounted field) and June 2017 (entire SDH plant)

Heat transfer medium

Thermal oil

Solar circuit temperature

220 °C

Total tank volume for both solar fields

66,000 m3

Type of storage

14 steel tanks

Maximum tank water temperature

95 °C

Floor space heated by SDH system

500,000 m2 (residential buildings, buildings in neighbouring industrial zone and shopping mall)

Estimated annual solar yield

83 million kWh

Specific solar yield

887 kWh/m2 of aperture area

Backup system

Gas and electric boilers

Solar plant operator

XuChen Energy

Total amount invested in solar fields, including storage, installation and heat network

RMB 0.55 billion (USD 81.05 million)

Specific investment costs per m2 of aperture area, including heat network

872 USD/m2

CAPEX funded by

regional government (100 % funding)

Technical and financial data on the SDH plant in Baotou. Source: XuCheng
 
Sources for this article include a WeChat interview with Mr Yu Wang and the following news reports:
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