Tianjin Geothermal Resources Development and Management Report

During the winter and the twelfth lunar month, he went to the Huaxin Apartment Community in Hedong District of Tianjin and walked into a home without a doubt. The interior was warm and welcoming. The chief of the district geothermal power station told the reporter that the district under their jurisdiction had already achieved geothermal heating as early as in 2000, and the heating area reached 200,000 square meters.

This is just a microcosm of geothermal heating in Tianjin. At present, there are 140 heating communities like this in Tianjin, and the geothermal heating area has reached 12 million square meters, accounting for about 10% of the city's total central heating area and accounting for 50% of the country's total geothermal heating area.

Tianjin is the largest city in China that utilizes geothermal heating. The city’s 140 geothermal stations are equivalent to replacing 336,000 tons of raw coal each year, reducing emissions of 2,688 tons of coal dust, 2,710 tons of NO x, 57 tons of nitrogen oxides, and reducing carbon monoxide emissions by 171,400 tons. cubic meter.

“Geothermal is an advantageous mineral resource in Tianjin. Tianjin has a pioneering geothermal exploration, a large scale of use, a good management order, and a high level of technology. It is a leading large-scale city for exploration, development, comprehensive utilization and management of geothermal resources in China.” The hot community's unanimous assessment of geothermal utilization in Tianjin.

The geothermal economic environment has significant benefits. In 1936, Tianjin produced the first geothermal well, and the geothermal development and utilization of Tianjin began after the 1970s. After more than 30 years of exploration and development, Tianjin has gradually formed a pattern that uses geothermal heating as the main body and sets industrial and agricultural production, hot spring physical therapy, hot spring tourism, recreational bathing, and domestic hot water.

At present, there are 264 mining wells that have been incorporated into geothermal resources management in the city, and the annual extraction volume is 26 million cubic meters. Geothermal brings significant economic and environmental benefits to Tianjin.

- Currently, about 100,000 households can live hot water, which greatly improves the quality of life of the people. More than 10 million people enjoy comfortable spa baths every year in factories, universities, schools and other enterprises and institutions.

——18 hot spring recreation projects have been built using geothermal resources, and the city’s hot spring pool area has reached 20,000 square meters.

——Utilizing geothermal breeding, planting an area of ​​200,000 square meters, rare flowers and valuable aquatic products have become the symbol of modern agriculture in Tianjin.

The environmental benefits of the development and utilization of geothermal resources in Tianjin are also enormous. The city’s existing 140 geothermal heating stations, equivalent to the construction of 140 boiler houses, are equivalent to replacing 336,000 tons of raw coal annually, reducing emissions of 2,688 tons of coal dust, 2,710 tons of dioxide dioxide, and 2016 tons of nitrogen oxides, reducing carbon monoxide. 17.14 million cubic meters of emissions.

Establishing the mode of management of mining and irrigation balance According to the statistics released by the World Geothermal Congress, the most directly used geothermal resources in the world are China, and the one most directly used by geothermal heat in China is Tianjin. The experience of Tianjin’s scientific use of geothermal has attracted the attention of the international geothermal community. Geothermal experts from Iceland, New Zealand and other countries have made special trips to Tianjin for inspections. They believe that Tianjin has achieved an ideal model for geothermal utilization in low- and medium- Development gave a high evaluation.

If geothermal energy is only used for heat without water, so that geothermal resources can be regenerated, recharge technology must be used. In response to this worldwide problem, in 1996 Tianjin took the lead in conducting research on recharge irrigation technology and succeeded in bedrock thermal reservoirs. Afterwards, the management department insisted that the bedrock geothermal heating project implement an approval system for one-for-one irrigation, so that the rate of recharge of bedrock mining and irrigation systems will be maintained at over 80%. At present, the city has approved the establishment of 60 geothermal irrigation stations. This technology has been widely recognized by geothermal experts at home and abroad.

Geothermal cascade utilization technology is also an important promotion technology for geothermal development and utilization in Tianjin. Geothermal cascade utilization technology is multi-level extraction of thermal energy from geothermal water, using floor heating, heat pump and other related technologies to make full use of thermal energy, reduce geothermal tail water temperature, and improve resource utilization. This technology has increased geothermal utilization from 45% to 85% of conventional utilization. At present, this technology has been widely promoted in geothermal heating projects in Tianjin.

The demonstration project for the sustainable development and utilization of geothermal resources in Tianjin Binhai New Area has also been launched.

The exploitation of geothermal resources in the Binhai New Area is mainly concentrated in the Neogene Minghuazhen Formation and the Guantao Formation. Because of the formation reasons, it is difficult to recharge the irrigation and it is difficult to achieve the sustainable development and utilization of geothermal resources.

To this end, last year the Tianjin Municipal Bureau of Land Resources and Housing organized an expert demonstration meeting to evaluate past working methods and improve the construction process of geothermal well irrigation. At the same time, a geothermal recharging well was drilled in the Huatai Modern Agricultural Park in Tianjin City, and a two-irrigation model consisting of the existing wells and irrigation and wells was used to conduct a new round of geothermal recharge test, and the geothermal recharge of the pore type. The bottleneck is expected to make a breakthrough.

Intelligent networked monitoring Fully spread geothermal Like other resources, reserves are limited and must be mined scientifically.

Geothermal wells intelligent network monitoring system construction is a highlight of geothermal management in Tianjin. In the past, if you want to understand the exploitation of geothermal wells, the staff must be physically present at the scene, which is labor-intensive and inefficient. Since 2006, Tianjin State Land and Housing Administration Bureau has begun to invest funds and technical strength, and developed an intelligent network monitoring system in cooperation with the geothermal center of Tianjin University. At present, the system hardware installation tasks have basically been completed. Today, managers only need to turn on the computer, and the exploitation of hot wells at a glance is clear at a glance.

In 2009, it was the first year that all the geothermal network systems in Tianjin had been installed and operated. While the management department strengthened geothermal well remote monitoring and management, it constantly updated and improved the software and hardware performance of geothermal wells intelligent networked systems. In response to previously exposed problems, the wireless communication relay servers managed by the two companies have been integrated into one unit, and the geothermal department of the Tianjin Land and Housing Authority is responsible for ensuring the stable operation of the networked monitoring system.

In actual operation, the Tianjin Bureau made bold innovations and increased the remote communication functions of the upper computer and the lower computer for the networked monitoring system. This not only enhanced the management and control of the upper computer to the lower computer, but also realized the remote fault monitoring and maintenance of the lower computer by the upper computer. It reduces the number of maintenance personnel to on-site maintenance, saves maintenance costs and improves the automation level of networked systems.

Experience in the development of shallow geothermal energy exploration and utilization pilot project has been highly valued by the Ministry of Land and Resources for its experience in the development and utilization of geothermal energy in Tianjin. In October 2009, the Ministry of Land and Resources and major leaders of Tianjin jointly agreed to jointly develop shallow geothermal energy in Tianjin. The use of pilot work requires that the pilot work not only lays the foundation for the development and utilization of shallow geothermal energy in Tianjin, but also plays an exemplary role in the country. Under the guidance of the Ministry of Land and Resources, the work plan for "investigation in advance, planning for follow-up, demonstration of engineering, place of monitoring, and policy guarantee" was established.

The Ministry of Land and Resources attaches great importance to the development and utilization of shallow geothermal energy resources. On December 3, 2008, it issued the "Notice on Promoting the Development and Utilization of Shallow Geothermal Energy." In accordance with the requirements of the Ministry of Land and Resources, Tianjin City planned ahead of schedule and tried it first. In January 2009, it deployed in key areas such as Binhai New Area to carry out shallow geothermal energy resource surveys. After being identified as a pilot city in October 2009, Tianjin City re-established its work plan and carried out five special topics.

The Tianjin municipal government attached great importance to the pilot work. The mayor Huang Xingguo repeatedly made important instructions. The municipal government set up the vice mayor Xiong Jianping as the team leader, the municipal director of the State Land and Housing Bureau Wu Yanlong as the deputy leader, and the municipal relevant commissions took the leadership of Members' pilot work leading group. The shallow geothermal energy pilot project has a tight working time and heavy tasks. Completing the five special research projects in a one-year period requires breaking the traditional geological work flow and mode, and the multiple themes go hand in hand. Tianjin City has achieved a series of results after more than one year of intense and orderly work in accordance with the principle of “unified deployment, synchronized implementation, focused emphasis, and close cooperation”. The topic of resource investigation has been fully completed and passed the evaluation of the expert group, which has achieved excellent grades and has reached the international advanced level.

Through the investigation of geothermal resources, the conditions for the occurrence of shallow geothermal energy resources in Tianjin were ascertained, and the current status of the development and utilization of shallow geothermal resources in Tianjin was mastered. The appropriate zoning for the development and utilization of shallow geothermal energy resources was conducted and the shallow layers of Tianjin were evaluated. The amount of geothermal energy resources and potential for development and utilization analyzed the economic environmental benefits of the development and utilization of shallow geothermal energy resources, compiled a plan for the development and utilization of shallow geothermal energy resources in Tianjin, and summarized and improved the exploration techniques for shallow geothermal energy ground source heat pump sites. The evaluation of environmental geology in typical regions has established a well-established database.

The above results provide government organizations and development and utilization units with a more systematic and intuitive understanding of the occurrence and utilization of shallow geothermal energy resources in Tianjin, and provide more important data for scientific management and guidance of shallow geothermal energy development and utilization.

The shallow geothermal energy development and utilization plan in Tianjin is one of the key tasks.

In order to reasonably coordinate the development and utilization of shallow geothermal energy resources in Tianjin, optimize the layout of development and utilization, adjust the development and utilization structure, standardize development and utilization behaviors, and improve the level of development and utilization, Tianjin has developed the city's shallow geothermal energy resources development and utilization planning. The plan was rated as excellent by experts.

The plan is based on the shallow geothermal energy resource survey results, using a combination of qualitative and quantitative methods, using computer technology and advanced and applicable software to establish a shallow geothermal energy resource demand analysis and prediction model, comprehensive analysis of shallow geothermal energy in Tianjin Development and utilization status, resources supply and demand situation, development and utilization technologies and other conditions. According to the economic and social development strategy and layout of Tianjin City, the division of the shallow geothermal energy resources in Tianjin and the appropriate division of development and utilization were carried out. The scientific development and utilization plan was proposed, and the ideas for the development and utilization of demonstration projects and key projects as well as the development and utilization technology research and development and promotion were determined. . At the same time, it conducts analysis and research on the issues of exploration and evaluation, development and utilization of dynamic monitoring, environmental impact, investment and benefits, and proposes safeguard measures for planning implementation.

Not only that, the development and utilization plans have closely integrated Tianjin's urban development master plan, energy planning, underground space development plans, etc., and have optimized the shallow geothermal energy development and utilization layout in the near-term key development zones according to different utilization methods and different depths. .

The preparation and implementation of the plan for the development and utilization of shallow geothermal energy resources in Tianjin has important demonstration significance for the formulation of policies and regulations for the development and utilization of shallow geothermal energy resources and for regulating the development and utilization of shallow geothermal energy resources.

In order to standardize the scientific development and utilization of shallow geothermal energy and promote the healthy and orderly development of the industry, Tianjin has carried out demonstration project construction. Through the selection of 12 typical projects of different regions, types and modes of utilization and scale, the city’s superficial The geothermal energy development and utilization project has played a role in promoting and demonstrating in strict accordance with technical standards and norms.

Through the demonstration project construction, the standards and requirements for project construction and management were put forward, which provided the basis for the development of standardized geothermal energy utilization in shallow geothermal energy in Tianjin.

In order to grasp the dynamic changes of geothermal field and groundwater under the conditions of shallow geothermal energy development and utilization, the Tianjin Municipality has established a dynamic monitoring network in conjunction with demonstration projects.

The first is to establish a dynamic comprehensive monitoring station for 12 demonstration projects, with the functions of heat exchange system monitoring and operation system monitoring. The monitoring data is complete and accurate. Monitoring data is transmitted to the central station through dual-channel wireless communication, which can provide a basis for technical and economic evaluation of demonstration projects.

The second is to complete the construction of a shallow geothermal energy test field and establish a shallow geothermal energy development and utilization research base. Not only provides a test and research base, but also can use technological resources to carry out high-tech product development and production.

The third is to cooperate with Nankai University and other scientific research units to independently develop monitoring equipment and system software such as distributed tessellation fine temperature measurement and digital transmission system, and have obtained 3 national patents.

Fourth, the “Technical Regulations for Dynamic Monitoring of Ground-source Heat Pumps in Tianjin Underground” has been formulated to provide standards for the construction of dynamic monitoring systems for buried ground source heat pump projects in the future.

Fifth, the Tianjin shallow geothermal energy dynamic monitoring center was established to provide guidance for conducting shallow geothermal energy exploration, design, technical research and training.

In order to promote the orderly development and standardized management of shallow geothermal energy in Tianjin, and to achieve the sustainable development and utilization of shallow geothermal energy resources, Tianjin City, on the basis of thorough investigation and research, combined advanced management experience at home and abroad with the current management situation of the city, proposed "Opinions on Promoting Development and Management of Shallow Geothermal Energy in Tianjin."

The rational development and utilization of geothermal resources and shallow geothermal energy in Tianjin will surely play an active role in the city's energy-saving and emission reduction, and create a resource-saving and environment-friendly city.