| With the increase of coal mining depth,the problem of high temperature heat damage in mines has become more and more prominent.it is necessary to effectively cool the mine to ensure the safety of the miners in the high temperature working environment and the efficient production of coal mines,cooling with an air conditioning system is one of the effective technical measures.Based on the increasing energy consumption of the pump and the improvement of the cooling capacity of the chiller,the use of large temperature difference cold water operation in the mine cooling system can effectively reduce the total energy consumption of the system.Based on the theoretical formula,this paper analyzes the changes in the thermal performance of chillers,pumps and air coolers after the mine cooling system adopts the cold water large temperature difference technology,the results show that the thermal performance of the chiller is basically not affected by the large temperature difference of cold water;The energy consumption of the pump is mainly related to the size of the pipe diameter and the temperature difference of the cold water,the appropriate pipe diameter should be selected according to the economic specific frictional resistance and then the energy consumption analysis and calculation should be carried out;When analyzing the thermal performance of the air cooler,according to the heat exchange efficiency coefficient,the expression of total hot cooling is fitted by computer programming regression,the results show that the cooling capacity of the air cooler decreases with the increase of the cold water temperature difference,the energy consumption of the air cooler increases as the temperature difference of the cold water increases,the water resistance of the air cooler decreases as the temperature difference of the cold water increases.This paper calculates the initial investment and energy consumption of each equipment in the large temperature difference mine cooling system.In the initial investment calculation,the initial investment of the pump and the chiller is estimated by the power;The initial investment of air coolers is estimated by area;the initial investment of the cold water system is estimated by the diameter of the pipe.In the calculation of energy consumption,the effect of cold loss on the energy consumption of the chiller and the energy consumption of the cooling system is considered.Analyze and compare various economic evaluation methods,introduce the system refrigeration coefficient,and based on the calculated energy consumption and initial investment,a mathematical model for the economics of the large temperature difference mine cooling system is established.Optimization theory is used to solve the optimal temperature difference of large temperature difference mine cooling.When analyzing the change of total energy consumption and total investment,the energy consumption change coefficient and the initial investment change coefficient are introduced.According to the calculation results of each major equipment,the energy consumption and initial investment changes of chillers and cooling systems have little impact on total energy consumption and total investment.changes in energy consumption of pumps and air coolers are the main factors affecting total energy consumption;the initial investment in air coolers,pumps and cold water systems is the main factor affecting the total investment.according to the total energy consumption and the total investment function,the optimization objective function is established,and the optimal temperature difference under different cooling load and cooling distance is solved.The cooling load and cooling distance of the working surface and the optimal temperature difference are found.There is no obvious law between them,and the cooling distance has little effect on the optimal temperature difference.At the same time,according to the calculation formula of this paper,the computer program for solving the optimal temperature difference is given. |
