Multi-channel cyclic sampling gas analysis method

A gas analysis and multi-channel technology, applied in the direction of analysis materials, sampling devices, measuring devices, etc., can solve the problems of analyzer data distortion, error revelation and discarding of analyzer sample gas analysis data, so as to promote popularization and application and improve accuracy sexual effect

Active Publication Date: 2015-05-06
WISDRI ENG & RES INC LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a multi-channel cyclic sampling gas analysis method to solve the process of data change and stability in the process of cyclic switching of channels in the prior art, and in this process the analyzer The data is seriously distorted and must be discarded, which makes the sample gas analysis data provided by the analyzer give false revelations during this process

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Embodiment 1

[0023] Such as figure 1 As shown, it is a schematic diagram of the structure of a multi-channel circulating sampling gas analysis system provided by an embodiment of the present invention. The analysis system shown includes a single set of analyzer equipment involved in the present invention (since the analyzer equipment involves multiple devices, including : display device, sensing device, controller, because they are distributed in different parts of the whole system, so they are not marked one by one in the figure). The system architecture provided in this embodiment is applicable to each method embodiment proposed in the present invention, but does not limit the scope of application of each method embodiment proposed in the present invention.

[0024] figure 1 SV-0A is the three-way solenoid valve of sample gas channel A, SV-0B is the three-way solenoid valve of sample gas channel B, SV-00C is the purge solenoid valve of sample gas channel C (nitrogen), and SV-00D is The...

Embodiment 2

[0028] Such as figure 2 Shown is a flow chart of a multi-channel cyclic sampling gas analysis method provided by an embodiment of the present invention, consisting of figure 2 As can be seen, the embodiment of a kind of multi-channel circulating sampling gas analysis method provided by the present invention comprises:

[0029] The data processing method of this patent is realized by a software system composed of data processing software and an industrial PLC control system. The functions of the data processing software are database management, forecasting model establishment and calculation; the functions of the industrial PLC control system are the hardware switching of the analysis system channel, the analysis data and the human-computer interaction (Human Machine Interface, abbreviation: HMI) of the system operation.

[0030] Since the basic principle of data processing of the multi-channel automatic circulation sampling analysis system has nothing to do with the number ...

Embodiment 3

[0045] In step 202 of the second embodiment, after the prediction model training of each channel ends, the system enters the channel switching training process. This embodiment provides a specific implementation of the channel switching training method for step 203 or 205 in the second embodiment. Such as image 3 shown, including:

[0046] In the case of keeping the hydrogen content of the annealing furnace basically stable, the system passes such as image 3 The channel switching training shown obtains the switching time of each channel. Take dual-channel switching training as an example:

[0047] In step 301, when the sample gas channel A is switched to the sample gas channel B, the timer T1 is started to count, and at the same time, the change rate of the sampled data is monitored.

[0048] In step 302, when the rate of change of the data is <5%, that is, when the sampled data is considered to be stable, proceed to step 303; otherwise, return to step 301 to continue mo...

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Abstract

The invention provides a multi-channel cyclic sampling gas analysis method. In a self-learning stage, when analysis meter equipment is switched into a sample gas channel B from a sample gas channel A, the switching time is started to be timed; the analysis meter equipment is used for sampling input data and output data of the sample gas channel B; the theoretical output value is calculated according to the input data of the sampled sample gas channel B; the error value of the theoretical output value and the sampled output data is acquired through comparison of the theoretical output value and the sampled output data; when the calculated average error value is less than the preset threshold value, timing is stopped, the timing result is defined as the switching time tA-B; and in a subsequent practical working stage, when the sample gas channel A is switched into the sample gas channel B each time, after the switching time tA-B transition is finished, practical data can be taken on. The multi-channel cyclic sampling gas analysis method can provide the sample gas analysis accuracy of all channels.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring, in particular to a multi-channel cyclic sampling gas analysis method. Background technique [0002] During the operation of industrial furnaces, in order to ensure the safety of the furnace body and meet the process requirements, it is often necessary to conduct online analysis of the gas content in the furnace atmosphere such as trace oxygen and hydrogen. In order to save investment and facilitate maintenance, a single set of analyzer equipment is often used for cyclic sampling and analysis of multiple sample gas channels. [0003] But precisely because of the cyclic sampling process of the analysis system, the analyzer equipment can only sample one channel at a certain time, which will cause the analyzer to be unable to obtain the sample gas information in other channels that have not been sampled at this sampling time. [0004] Moreover, since it takes time for the sample gas to pa...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N1/24
Inventor 张凯
Owner WISDRI ENG & RES INC LTD
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