The Application Of System-wide Absorption Regenerative Cycle In Combined Heat And Power

Now the CHP centralized heating of the north of our country face two problems to varying degrees, the incapacity of the power plant heat supply and incapacity of the heating pipe network. Combined with the CHP centralized heating current situation of the power plant in Shandong province, this paper put forward a project that transform the heating station and the central station of the heat supply network using the CHP centralized heating technology based on system-wide absorption regenerative cycle. The first kind of absorption heat exchanger is installed in the heating station to replace the heat exchanger to reduce the return temperature of primary heating network significantly using the available energy of large temperature difference between the primary heating network and the secondary heating network. The single-double effect regenerative absorption heat pump is installed in the central station of the power plant heat supply network to heat the primary heating network by using steam extraction of steam turbine and recycling exhaust heat of the circulating cooling water.This paper introduce the work progress and thermal calculation method of system-wide absorption regenerative cycle in detail and write the thermal calculation procedure. I analyze the property of the system-wide absorption regenerative cycle, know the influence of the supply temperature and return temperature of secondary heating network, the supply temperature of primary heating network, regenerator effectiveness, outlet temperature of recycled water and supply temperature of primary heating network on system-wide parameter. At the same time I analyze the operation condition of the system when the outdoor temperature is changing. The primary heating network and secondary heating network use constant flow method to adjust heating supply when the system is actual operation. And then I use dimensionless formula method to draw heating load duration graph.This paper analyze the system-wide absorption regenerative cycle from three sides, the energy-saving benefit, economic benefit, environmental benefit. Analysis shows that, the CHP centralized heating technology based on system-wide absorption regenerative cycle can recycle exhaust heat of the circulating cooling water and enhance heating capacity of the power plant. It can enhance the transportation of the heating network and solve the problem of the incapacity of the network. It can decrease the evaporation capacity of the power plant circulating water, and save water resources.