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Temperature Control Method of Resistance Furnace Based on Arrangement and Combination of Geometric Sequences

A temperature control method, permutation and combination technology, applied in furnace control devices, furnaces, furnace components, etc., can solve the problems of low temperature control accuracy, easy to generate harmonics, low cost, etc., achieve high temperature control accuracy, overcome disturbance, No harmonic effect

Active Publication Date: 2020-05-19
HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Method 1), can achieve precise temperature control, small temperature range, but high cost, low reliability, and easy to generate harmonics, especially when the installed capacity of the resistance furnace is large, the current harmonic content is easy to exceed the standard;
[0007] Method 2), the cost is low, but the temperature control accuracy is low, and it cannot automatically adapt to large external disturbances

Method used

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  • Temperature Control Method of Resistance Furnace Based on Arrangement and Combination of Geometric Sequences
  • Temperature Control Method of Resistance Furnace Based on Arrangement and Combination of Geometric Sequences
  • Temperature Control Method of Resistance Furnace Based on Arrangement and Combination of Geometric Sequences

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Embodiment 1

[0076] refer to figure 2 , in the first embodiment of the present invention, the grouping quantity of a single resistance furnace is recorded as 3, and the 1st, 2nd, and 3rd groups are recorded respectively, and the power of the 1st group is recorded as q, then the 2nd group is 2q, and the 3rd group is 4q. The power is 7q; if the installed power of the resistance furnace is p, then q=p / 7; the total output power is Arrange the above 7 kinds of power from small to large, that is, q, 2q, 3q, 4q, 5q, 6q, 7q, and the difference between the two adjacent powers is q; perform PID adjustment calculation and convert it into the required q for actual output Integer multiple, denoted as f k , build an index table, as shown in Table 1:

[0077] Table 1 Corresponding index table when a single resistance furnace is divided into 3 groups

[0078] f k

The serial number of the input group Corresponding output power 0 none 1 1 q 2 2 2q 3 1,2 q+2q ...

Embodiment 2

[0082] refer to image 3 , in the second embodiment of the present invention, the grouping quantity of a single resistance furnace is recorded as 4, and the 1st, 2nd, 3rd, 4th groups are recorded respectively, and the power of the 1st group is recorded as q, then the 2nd group is 2q, and the 3rd group is 4q , the fourth group is 8q, and the total power is 15q; if the installed power of the resistance furnace is p, then q=p / 15; the total output power is Arrange the above 15 powers from small to large, that is, q, 2q, 3q, 4q, 5q, 6q, 7q, 8q, 9q, 10q, 11q, 12q, 13q, 14q, 15q, the difference between two adjacent powers is q; carry out PID adjustment calculation and convert it into an integer multiple of q required for actual output, which is recorded as fk, and an index table is established, as shown in Table 2:

[0083] Table 2 Corresponding index table when a single resistance furnace is divided into 4 groups

[0084] f k

The serial number of the input group ...

Embodiment 3

[0088] refer to Figure 4 , in the third embodiment of the present invention, the grouping quantity of a single resistance furnace is recorded as 5, and the first, 2, 3, 4, and 5 groups are recorded respectively, and the power of the first group is recorded as q, then the second group is 2q, and the third group is 4q, the fourth group is 8q, the fifth group is 16q, and the total power is 31q; if the installed power of the resistance furnace is p, then q=p / 31; the total output power is Arrange the above 31 kinds of power from small to large, that is, q, 2q, 3q, 4q,..., 30q, 31q, and the difference between two adjacent powers is q; perform PID adjustment calculation and convert it into the required q for actual output Integer multiples of , denoted as f k , build an index table, as shown in Table 3:

[0089] Table 3 Corresponding index table when a single resistance furnace is divided into 5 groups

[0090]

[0091]

[0092] It can be seen from Table 3 that only 5 grou...

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Abstract

The invention discloses a temperature control method of resistance furnaces arranged and combined based on a geometric sequence. The temperature control method comprises the following steps of performing grouping and power determination, carrying out PID adjustment calculation and output conversion, and determining groups which are put into use and groups which are removed. According to the temperature control method of the resistance furnaces arranged and combined based on the geometric sequence, PID adjustment calculation is carried out on the basis of the equal-ratio sequence, and then theelectric resistance furnaces are arranged, combined and subjected to switching. By means of the temperature control method, the output of different power can be realized through very few number of groups, large external disturbance can be overcome, a high temperature control precision can be realized, harmonic waves are not available, the cost is low, and the temperature control method is suitablefor gas heating, and is also suitable for automatic control of heating temperature of flowing media such as liquid.

Description

technical field [0001] The invention relates to the technical field of medium heating temperature control, in particular to a resistance furnace temperature control method based on geometric sequence arrangement and combination. Background technique [0002] In the application of flowing medium heating, the outlet temperature of the medium flowing out of the resistance furnace is the process controlled object, which needs to be stabilized at a certain temperature, and the actual temperature difference is within the upper and lower limits. There are three main traditional temperature control methods: [0003] 1) The resistance furnace is not grouped, and the thyristor voltage regulation or solid state relay switching is controlled by PLC; [0004] 2) The resistance furnace is divided into multiple groups evenly, and all of them are switched by contactors. One or two groups are automatically controlled by PLC, and the rest of the groups are fixed. [0005] Each of the above ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D19/00
Inventor 任复明胡海邹会忠
Owner HANGZHOU FORTUNE CRYOGENIC EQUIP CO LTD
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