| The converter valve and valve cooling system are expensive,and the investment of converter station infrastructure investment is huge,the converter valve cooling capacity is large and the outlet water temperature is generally low,which belongs to low-grade thermal energy and the direct utilization range is narrow,so its utilization has not received enough attention.In response to this problem,this article studies the following:(1)By investigating the cooling method of the external cooling system of the valve and the operating data of the typical converter station,the dependence relationship of the heat source of the converter valve residual heat,the environmental temperature control index of the valve hall and the heat sink of the external environment is determined,which provides a theoretical basis for subsequent project research.(2)Performance of thermal analysis on the designed two types of converter valve waste heat systems.For the heat exchange of the converter valve waste heat and heat supply system,after thermal calculation,under the condition of meeting the heating and cooling demand load of the valve hall,the system heating coefficient It is 3.26 and the cooling coefficient is 2.48,which can be used as an alternative to the auxiliary cooling scheme of the valve hall or when the mechanical cooling mode fails;for the seawater desalination system of the converter valve residual heat,three system schemes are established to calculate the heat pump system and single-effect seawater separately The thermal performance of the desalination system under the set working conditions,the results show that the single-effect seawater desalination system combined with the compression heat pump has the best water production performance,and then analyzes the water production performance of the system under different working conditions to find the best working point After a horizontal comparison,it is found that the compression heat pump-single-effect mechanical pressure steam distillation system performs better on the thermal performance of the heat recovery of the converter valve and has reasonable utilization value.(3)The thermal economy analysis of the system shows that the cost of water production is 4.74 yuan / ton,the unit price of the output cooling capacity is 34.09 yuan / kwh,and the average cost of the input raw material is 0.43 yuan / kwh,,which indicates that the waste heat utilization of the converter valve has some advantages in the direction of seawater desalination.(4)Using the MATLAB environment as a simulation platform,the mathematical model of the main components of the system is established according to the working principle of the seawater desalination system and the heat and mass transfer characteristics;the simulation results show that the theoretical analysis calculations are similar to the results of the simulation system;The influence of important independent parameters on the system recovery rate,specific power consumption of fresh water,and system utilization performance is investigated.The study found that the temperature of the residual hot water,the thermal conductivity of the pipe,the isentropic efficiency,and the increase in the seawater temperature all contribute to improving the system's water production performance.In this paper,different waste heat utilization systems of converter valves are introduced,and the performance of the system is evaluated by different evaluation angles(energy efficiency analysis,energy efficiency analysis,economy analysis),and the simulation platform is built to simulate the performance of the system,and a more reasonable engineering design scheme is established,which has certain application engineering value. |
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