Sugarcane Press Automatic Control System

Abstract

The invention discloses an automatic sugarcane squeezing control system. The automatic sugarcane squeezing control system comprises an automatic sugarcane conveying belt control system, an automatic header tank material level control system and an automatic seepage water and minced sugarcane weight matching control system. The weight of squeezed minced sugarcane is measured through a double-weight-measurement method, material level sensors are installed on header tanks and used for measuring the material levels of the header tanks, A DCS control system controls the speed of a presser and the speed of a quick conveying belt according to the material levels of the header tanks, stability of the header tanks is controlled, an electromagnetic flower meter and a control valve are installed on a seepage water pipeline, and seepage water is controlled. The automatic sugarcane squeezing control system can accurately and uniformly control the amount of the squeezed minced sugarcane and can accurately control the additive amount of the seepage water, the maximal efficacy of the presser can be exerted, serious consequences of production halts caused by damage to the presser due to frequent speed regulation are avoided, and meanwhile, the sugar extraction rate can be further increased, heat energy evaporated in the following process is reduced, and the most ideal effect of automatic squeezing control is achieved.

Description

technical field [0001] The invention relates to the technical field of DCS industrial process control, in particular to an automatic control system for sugarcane pressing. Background technique [0002] Pressing is the first process of sugar production. Whether it is normal or not directly affects the production status of subsequent sections. If its production is not normal, it will affect the normal production of the whole plant, product quality, power, steam stability, and energy consumption. and production safety are seriously affected. However, due to the extremely complicated control relationship in the pressing workshop, various production parameters are interlocking and closely related, and it is a very complicated project. [0003] The key process requirements for sugarcane crushing are: not only to ensure that the entire crushing process is carried out safely, efficiently, and smoothly, but also to minimize the frequency of speed regulation of the squeezer, so as to...

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Problems solved by technology

[0005] 1. The control scheme and its defects measured by nuclear scales: According to the weight of sugarcane shreds to be squeezed by nuclear scales, the speed of the conveyor and the amount of permeated water added are controlled. This is the control scheme adopted by most sugar factories in China at present. Its main flaws are:

[0007] The nuclear radioactive sources used in nuclear scales are more or less harmful to the human body. During use, they not only directly endanger the health of operators and maintenance workers, but also have harmful effects on consumers who eat sugar products made of sugarcane shreds that have been exposed to nuclear radiation. Hazards, many countries including Thailand in Southeast Asia prohibit the use of nuclear scales in sugar factories

[0008] (2) The conversion is complicated and the error is large

[0031] We know that each measurement parameter will have an error, and the mass absorption coefficient of the material is also different due to the difference in sugarcane origin, variety, and batch. The above calculation involves nearly 10 measured values ​​and 1 mass absorption coefficient. There are so many error factors. The error will be even greater when superimposed. Therefore, the method of indirectly calculating the weight of sugarcane shreds to be squeezed through the measurement of nuclear scales is complex and inaccurate, which will inevitably affect the control accuracy of smooth pressing and the amount of permeated water added, resulting in unsatisfactory smooth pressing effect. Partial extraction rate decreases and subsequent heat of evaporation increases

[0032] (3) The installation, maintenance and repair of nuclear scales are troublesome

[0037] (1) Since the cane falling is uneven from the beginning, if the speed of each cane conveyor belt is synchronized, it will be difficult to ensure the uniformity of the sugarcane shreds on the last stage of the cane conveyor belt. Therefore, the control is too rough and the effect is not ideal

[0038] (2) Since there is no measurement of the incoming sugarcane shreds, there is no reference basis for the control of the amount of permeated water added, and it is impossible to accurately control it at all.

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