cement kiln has been relatively mature. However, with the wide application of six-stage preheater in cement kiln firing system, the outlet flue gas temperature of C1 cylinder drops to about ~ 250 ℃, resulting in the cement kiln waste heat power generation index falling to 24 ~ 26 kWh/t. Cl, and driven by the "double carbon" strategic goal, the traditional cement kiln waste heat power generation system is increasingly difficult to meet the expectations of enterprises.
In order to actively respond to the needs of enterprises, Nanjing Kaisheng Kaineng Environmental Protection Energy Co., Ltd. has innovatively developed the "Industrial Waste Heat High Efficiency Reheat Power Generation Technology", which is the only high-tech enterprise in China with the performance of cement kiln high efficiency reheat waste heat power generation project. The schematic diagram of cement kiln high efficiency reheat waste heat power generation system is shown in Figure 1. The corresponding patent certificate is shown in Figure 2.
Fig. 1 Cement Kiln High Efficiency Reheat Waste Heat Power Generation System
Fig. 2 Cement Kiln High Efficiency Reheat Waste Heat Power Generation System Patent Certificate
Fig. 3 Hunan Cement Waste Heat Power Generation Project Site Map
This technology deeply taps the potential of waste heat resources. The power generation per ton of clinker has been significantly improved. Compared with the conventional industrial waste heat power generation system, the high-efficiency reheat power generation technology adds a reheater in the waste heat boiler, so that the temperature of the steam entering the low-pressure cylinder of the steam turbine is increased, the cycle thermal efficiency of the system is improved, and the power generation can be increased by more than 10%; In addition, the exhaust steam of the steam turbine is reduced, and the cold end loss is reduced, so that the power consumption of the circulating water system is significantly reduced, and the auxiliary power consumption rate is reduced by 30% -50%; because the reheating system has higher power generation efficiency, the increased investment cost of the reheating system can be recovered within 1.5 years.
With many advantages such as high power generation efficiency and short investment recovery cycle, the "Industrial Waste Heat High Efficiency Reheat Power Generation Technology" developed by Nanjing Kaishengneng Environmental Protection Energy Co., Ltd. has been widely recognized in the domestic market, and has been successfully applied and put into operation in many projects. Table 1 shows all the newly-built cement kiln waste heat power generation high-efficiency reheat projects in China. Practice shows that it has the advantages of high efficiency, stable performance, reliable operation and high degree of automation.
Table 1 In
order to further reduce energy consumption, more and more cement production lines in China have carried out the transformation of the firing system, in which the preheater at the kiln inlet has been transformed from 5 to 6, or even from 5 to 7. At the same time, in order to improve the efficiency of waste heat utilization, the waste heat power generation system has also been transformed into high-efficiency reheat power generation. Practice shows that after the reheat transformation, the power generation of the waste heat power generation system has been significantly improved. Table 2 shows all the high-efficiency reheat transformation projects of cement kilns put into operation in China.
Table 2 High-efficiency reheat reconstruction projects
for waste heat power generation of all cement kilns put into operation in China In addition, the high-efficiency reheat projects for waste heat power generation of cement kilns currently under construction in China are detailed in Table 3.
Table 3 Cement Kiln Waste Heat Power Generation High Efficiency Reheat Project
under Construction in China