Research On The Construction Of Thermal And Humid Environment For Qingyuan Pumped-storage Underground Powerhouse

As an important form of energy storage,pumped storage has played an important role in peak shaving,frequency modulation,phase modulation,emergency backup and absorbing excess electric energy.In recent years,with the continuous growth of power demand and the need for energy development and transformation,pumped storage has The construction of energy power stations has entered a stage of rapid development.Due to the underground powerhouse buildings of pumped storage power stations buried deep underground and large in volume,the cavern structure is complex,and there are many heat dissipation and moisture dissipating equipment,the construction of the heat and humidity environment is very complicated and affects the heat and humidity environment of the underground powerhouse.The main factors include heat and moisture transfer through the envelope structure,the state parameters of the fresh air,and the heat and moisture sources inside the plant.While the ventilation ducts of underground power stations are the main way for fresh air to enter the underground powerhouse,studying the use of ventilation ducts to achieve the pretreatment of fresh air is of great significance for maintaining a good thermal and humid environment in the underground powerhouse and reducing the energy consumption of the airconditioning system.This paper designs and builds a 1:30 model test bed for the underground powerhouse of Qingyuan Pumped-storage Power Station based on similar theories,completes the design and production of the test bed’s main structure,ventilation and air conditioning system,cold and heat source system,and test system.Model test research on the air distribution and thermal distribution in the generator layer,busbar layer,hydraulic turbine layer,volute layer,draft tube layer,and busbar tunnel of the main powerhouse of the underground power station,and air conditioning design by measuring the speed,temperature and other parameters of the working area The effect of the plan was evaluated and suggestions were made for hoisting induced fans above the busbar layer and the turbine layer to improve the airflow organization and make the room temperature more uniform.On the other hand,a heat and moisture transfer model between the humid air and the wall is established,and the airflow organization and heat and moisture distribution of the underground main powerhouse and auxiliary powerhouse of Qingyuan Pumpedstorage Power Station are calculated and verified by numerical simulation,and the heat and humidity parameters of each room are studied.The distribution and change rules are compared with the model test.The ventilation and air conditioning schemes are analyzed and optimized under the design conditions.It is proposed to arrange dehumidifiers at both ends of the volute layer and increase the air volume of some rooms in the auxiliary plant to meet the control of the heat and humidity environment.Suggestions for the requirements.Furthermore,numerical simulation analysis is carried out for the changes of the air temperature and humidity in the ventilation tunnel of the underground powerhouse.Different dehumidification schemes are compared,and the feasibility of using the fresh air channel to bear part of the humidity load to reduce the energy consumption of air conditioning is discussed.Finally,this article combines theoretical calculations and numerical simulations to design typical air-conditioning operating conditions and corresponding operating strategies,and on this basis,obtain the number of open units and the number of airconditioning units of different generating units under summer,transition season,and winter operating conditions.The corresponding relationship of the number of open exhaust fans provides an empirical reference for the design and actual operation of the power station.