Variable air volume laboratory temperature control system and method

Abstract

The invention provides a variable air volume laboratory temperature control system and method, and belongs to the field of automatic control. The system comprises a variable-frequency fresh air ventilator, a variable-frequency exhaust fan, a temperature sensor, an air pressure sensor, a PLC and a control room, wherein the variable-frequency fresh air ventilator, the variable-frequency exhaust fan, the temperature sensor and the air pressure sensor are respectively connected with the PLC; and the PLC is connected with the control room. A PLC control system is utilized, so that the influence of air volume change on the temperature in a laboratory is eliminated, the service life of laboratory instruments and equipment is prolonged, the using effect of the laboratory instruments and equipment is improved, the stability and accuracy of temperature change are ensured, and the problem of relevance control is solved. Experimental results show that the variable air volume laboratory temperature control system and method can play a good role in the laboratory, are good in use and control effect, and can automatically control the temperature in the laboratory according to the change of the air volume in the laboratory, so that unstable factors of the laboratory are reduced, and the use efficiency is improved.

Description

Technical field [0001] The present invention belongs to the field of automation control, and specifically, a temperature control system and method for a variable wind content laboratory. Background technique [0002] The petrochemical industry is an important economic pillar, petroleum petrochemical raw material specifications, the quality analysis of finished products, and the experimental analysis of public works, and other auxiliary tasks, it is necessary to rely on high-standard high-quality laboratories. Therefore, it is necessary to make a petrochemical laboratory with many functional needs in design planning, equipment selection, control schemes, etc. [0003] At present, there are some problems in the design construction and use of the Petrochemical Laboratory: the process plan is unreasonable, causing laboratory personnel to operate, unreasonable, benzene hydrocarbon compounds in the experiment and analysis process, acid The alkali wavase does not come out, causing the l...

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Problems solved by technology

[0003] At present, there are some problems in the design, construction and use of petrochemical laboratories: unreasonable process planning, resulting in inconvenient operation for laboratory personnel; unreasonable ventilation scheme, benzene hydrocarbons, acid The alkali volatile gas cannot be discharged, which causes too much odor in the laboratory; the design of the gas supply is unreasonable, and there are many gas points in the laboratory, and there is a risk of explosion if the design is unreasonable; the control method is unreasonable, and the operation of the variable air volume system is Reduced energy consumption, but caused large fluctuations in indoor temperature control

On the premise of taking into account the ventilation of variable air volume equipment and the exhaust of gas leakage accidents, how to ensure that the temperature change in the laboratory is within a controllable range, and will not affect the deviation requirements of some precision testing instruments for the ambient temperature, such research results Less, correlation control and holistic control technologies are not well applied to them

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