Automatic resistance furnace temperature control method based on queue model

A resistance furnace and model technology, applied in temperature control using digital devices, temperature control using electric methods, etc., can solve the problems of low cost of components, affecting reliability, and high cost, and achieve high reliability, easy maintenance, No harmonic effect

Active Publication Date: 2016-05-25
HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The above methods have their own advantages and disadvantages: in method 1, precise temperature control can be achieved, and the temperature difference range is small, but the cost of components is high, the reliability is low, and harmonics are easy to generate, especially when the installed capacity of the resistance furnace is large, the current Harmonic content is easy to exceed the standard; in method 2, the cost of components is low, but the temperature range is large, and one of the contactors is prone to contact burnout due to frequent switching, which affects reliability; in method 3, method 1 and The advantage of 2 is that it has a high cost performance when the installed capacity of the resistance furnace is not high, but when the installed capacity of the resistance furnace is high (for example, above 1000kW), the cost is still high, and when the thyristor or solid state relay fails, It is impossible to adjust the temperature, and the reliability is low

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  • Automatic resistance furnace temperature control method based on queue model

Examples

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Embodiment 1

[0031] Such as figure 1 As shown, the present embodiment provides a method for automatically controlling the temperature of a resistance furnace based on a queue model, which includes the following steps:

[0032] (1) Evenly group all the heating devices in a single resistance furnace into N groups according to the heating power. Any group of heating devices is connected to the power supply through a switching device, and all switching devices are controlled by a control device. ;

[0033] (2) Define the set temperature input from the control device as Tset, define the measured temperature collected from the control device as Tact, define the resection temperature of any group of heating devices as ΔTh, and define the input of any group of heating devices The aliquot temperature is ΔT1;

[0034] (3) Calculate the number of groups required to put in or remove the heating device. When TactTset, define the group number required to remove the heating device as E ,in,

[0035] ...

Embodiment 2

[0050]This example provides an application of the method in Example 1 in a resistance furnace with a rated power of 2500kW and below. Due to the limited capacity of the distribution transformer, the capacity of a single resistance furnace generally does not exceed 2500kW. When the resistance When the total capacity of the furnace exceeds 2500kW, it is generally divided into two or more units that work at the same time and are powered by different distribution transformers respectively. Through this example, it can be seen that the method in Example 1 can be better applied to existing furnaces with various power resistance furnace.

[0051] Considering the installation size and cost of the switching devices in the cabinet, the rated current of the switching devices is preferably no more than 400A. Therefore, when grouping, the power of each group of heating devices is preferably no more than 210kW. From the above, it can be seen that in the resistance furnace with a rated power...

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Abstract

The invention relates to the resistance furnace temperature control method technology field and particularly relates to an automatic resistance furnace temperature control method based on a queue model. The method comprises steps that (1), even group division is carried out, all heaters in a single resistance furnace are evenly divided into N groups according to heating power, any group of heaters is connected with a power source through a switch device, and all switch devices are controlled by a controller to realize on and off; (2), the setting temperature inputted from the controller is defined to be Tset, and the actually-measured temperature acquired at the controller is defined to be Tact; (3), the group quantity of heaters needing being switched on or switched off is calculated, when the Tact is smaller than the Tset, the group quantity of heaters needing being switched on is defined to be B, when the Tact is greater than the Tset, the group quantity of heaters needing being switched off is defined to be E; and (4), the heaters are switched on or switched off. Through the method, the temperature of the resistance furnace can be more excellently controlled.

Description

technical field [0001] The invention relates to the technical field of resistance furnace temperature control methods, in particular to an automatic control method for resistance furnace temperature based on a queue model. Background technique [0002] In the application of flowing medium heating, the outlet temperature of the medium flowing out of the resistance furnace (that is, the measured temperature Tact in the following) is the process controlled object, which needs to be stable at a certain temperature, and the actual temperature difference is within the upper and lower limits. There are mainly three traditional temperature control methods: 1. Resistance furnaces are not divided into groups, and the control device (usually PLC) controls the voltage regulation of silicon controlled rectifiers or switching of solid state relays; 2. The resistance furnaces are divided into multiple groups, and all use contactors to switch 3. The resistance furnace is divided into multip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/19
CPCG05D23/1917
Inventor 任复明黄海军陈秀妹
Owner HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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