Tsinghua Tongfang energy-saving technology settled in Tianjin

“This winter is different from the past. In the past, the white smoke at the top of the boiler house had already drifted in front of my house. White smoke was almost invisible this year, but the family was very warm,” said Mr. Li, a resident of Tianjin Rongchuang Jiangping Garden.

In order to ensure the heating of residents, the boilers of the Tianma Heating Center in Tianjin were all opened; at the same time, the Tsinghua Tongfang's deep flue gas waste heat recovery and utilization project was also started at the center.

Tianjin Tiantuo Heating Center is a large unit implementing the "coal to gas" project, with a heating area of ​​4 million square meters. The picture shows the heat pump unit used by the center. Tongfang Energy Saving Diagram

Livelihood protection and ecological civilization are indispensable

Tianmao heating center is a large unit of coal-to-gas transformation project in the downtown area of ​​Tianjin. The heating area is nearly 4 million square meters, accounting for 3.3% of the 120 million square meters central heating area in the central city. Before the transformation, the exhaust temperature of the boiler was about 90°C, and the smoke contained a lot of water vapor and waste heat. After entering the atmosphere, it condensed to form "white smoke." The long plume plumes to the surrounding houses with the wind, and the exhaust gas has an adverse effect on the health of the residents. At the same time, a large amount of waste heat is wasted.

In order to solve this problem, Tongfang Energy Saving Equipment Co., Ltd. (hereinafter referred to as Tongfang Energy Saving) uses the “contract energy management” business cooperation model to provide a heating center with a complete solution from capital to technology, from construction to operation.

The core of the program is "Fume Waste Heat Recovery System", which uses absorption heat pump technology to recover waste heat from the flue gas. The equipment includes absorption heat pump and contact heat exchanger.

Absorption heat pumps are devices that transfer heat from a low temperature zone to a high temperature zone and function like a water pump. The contact heat exchanger is a device for exchanging heat between the flue gas and the water. At the same time as the heat exchange, the water vapor and the acidic solute dissolve into the alkaline circulating water, so that the circulating water meets the requirements of the boiler on the water quality.

Tsinghua Technology Hebei Manufacturing Tianjin Application

“The Tiantuo project is the first flue gas waste heat recovery system that adopts the technical route of 'hot water type absorption heat pump and contact heat exchanger'. It avoids the gas, smoke, environmental protection, fire protection, etc. of the gas heat pump. Many hidden dangers are a bold attempt and a surprise breakthrough.” Engineer of Tongfang Energy Saving Company introduced, “This system can reduce the exhaust gas temperature to less than 30°C and recover most of the waste heat and condensate in the flue gas. Slightly lower nitrogen oxide (NOx) emissions, achieving four major benefits of energy saving, water saving, whitening (smoke), and emission reduction.

Wang Fuquan, chief technical officer of the thermal center, was very excited: “This is a typical scientific and technological service social achievement. There are very important demonstration effects in the industry and even in the whole country.”

The project construction unit Tongfang Energy Saving Equipment Co., Ltd. is a wholly-owned subsidiary of Tsinghua Tongfang. Relying on the scientific research strength of Tsinghua University, Tongfang Energy Saving Company manufactures internationally leading high-efficiency energy-absorption absorption units, provides technical reform programs and energy-saving services for heat source systems, and is one of the leading companies in the field of energy conservation and emission reduction in China.

Tongfang Energy Saving Company's production base is in Langfang, Hebei. Two 20 MW heat pumps are being built in the first phase of the waste heat recovery project that is being operated in Tianjin, recovering 40-50 gigajoules per hour (that is, 40-50 billion joules) of waste heat, and 1.2 million gigajoules can be recovered in one year. It saves more than 3.6 million cubic meters of natural gas, which equals the gas consumption of 3,500 households (100 square meters per household). About 300 tons of condensate water is recovered every day, which can be used as heat network water recycling.

The research team led by Prof. Shi Jun, Chairman of the Tianjin Refrigeration Association and Director of the Department of Building Environment and Equipment at Tianjin University, conducted a detailed examination of the energy efficiency level of the project. Statistics show that after the end of the heating season this year, the system will save 10.8% over the same period of last year.

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