基于组态软件、智能模块及PLC的岩土热物性原位测试仪监控系统

Automatic Detection and Control System of In-Situ Testing Equipment for Study Rock and Soil Thermophysical Properties Based on Configuration Software,Intelligent Module and PLC

介绍了应用地源热泵原理对地层的热物性进行原位测试的测试仪自动监控系统。系统通过检测并控制地热孔地下换热器进出口温差,保证恒热流输入。该系统由上位机及下位机系统组成:上位机由工控机作为监测控制核心,装有组态软件,编制整个控制系统操作界面和软件系统;下位机由两台AD转换智能模块采集各物理参数,一台可编程逻辑控制器(PLC)对控制动作执行机构进行控制输出。通过对4口地热井的实际工程应用,分别实现了连续72 h对地热孔地下换热器进出口温差的精确控制,控制精度小于0.1℃。

An automatic detection and control system of in-situ testing equipment studying rock and soil thermophysical properties applied ground-source heat pump theory is inroduced.This testing equipment pumps constant heat current into the ground heat exchanger by detecting and controlling the temperature difference of the exchanger entry and exit.This system is composed of the upper and the lower computer systems.In the upper computer system,an industrial computer is used as the core of detection and control,a configuration software is installed in it.The operation interfaces of the whole system and the software system are programmed by the configuration software.The lower computer system is composed of two analog-digital conversion intelligent modules and a programmable logic controller（PLC）.Two intelligent modules are applied to collect various parameters,and the PLC is applied to export the control signal,then control the actuator.Based on 4 experiments in different geothermal wells of 72 hours for each one,this automatic detection and control system achieved accurate control of temperature difference of the exchanger entry and exit continuously.The control precision is lower than 0.1℃.