Automatic liquid level control system for sugarcane juice steaming tank

Abstract

The invention discloses an automatic liquid level control system for a sugarcane juice steaming tank. A liquid sensor, a temperature sensor and a steam pressure sensor are arranged in the steaming tank; a sugarcane-juice brix sensor is mounted on an attached device of the steaming tank; cameras are mounted beside a liquid level meter of the steaming tank, a sugarcane juice input pump, an output pump and a steam inlet valve; a computer, a PLC (programmable logic controller) and video monitoring equipment are mounted in a center operation control room; various sensors are used for transmitting data of sugarcane juice level, brix, temperature and steam pressure in the steaming tank to the computer of the center operation control room, the computer is used for converting the data into output signals and sending the output signals to a memory of the PLC, a central processing unit is used for judging and processing the input signals according to a preset program in the memory, and the PLC is used for controlling quantity of heating steam which enters the steaming tank from a sugarcane juice feeding valve; the PLC is further used for transmitting real-time brix value, pressure value and liquid level of syrup to a man-machine interface for displaying, and an operator programs the PLC to control the whole device.

Description

technical field [0001] The invention relates to an automatic liquid level control system, in particular to an automatic liquid level control system for an evaporation tank in a sugar factory. Background technique [0002] The cane juice evaporation process is the section with the largest steam consumption in the sugar factory production process, accounting for more than 70% of the total steam consumption of the whole plant. Although the steam consumption is large, the juice steam produced is also large. Due to multi-effect evaporation, steam The utilization rate is high, and at the same time, according to the pressure and temperature of each juice vapor, it can provide heat energy for sugar boiling and heating equipment. The evaporation section is the center of the thermal system of the sugar factory. It is not only a consumer of high-temperature steam, but also a supply station for low-temperature steam (juice steam). At the same time, it is also the main source of boiler w...

AI Technical Summary

Problems solved by technology

This undoubtedly brings great inconvenience to the workers and increases their labor intensity.

In addition to increasing the labor intensity of employees, manual control also causes a large hysteresis phenomenon in liquid level control, which reduces the heat transfer efficiency of the entire evaporation system

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