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Method for detecting and disposing faults in natural gas reforming hydrogen production system

A technology of reforming hydrogen production and processing methods, which is applied in general control systems, control/regulation systems, and program control in sequence/logic controllers, etc., and can solve problems such as catalysts being easily polluted, economic losses, and unusable

Active Publication Date: 2018-11-06
ZHANGJIAGANG RES INST OF HYDROGEN ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this kind of fault removal are: 1. Regardless of whether the fault is a relatively simple low-level fault or a more complicated high-level fault, it will be shut down for maintenance, which greatly affects production efficiency.
2. During the emergency shutdown, the catalyst in the reformer, carbon monoxide converter, and desulfurization mechanism was not protected, which made the catalyst vulnerable to contamination and could not be used after the fault was resolved, resulting in economic losses

Method used

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  • Method for detecting and disposing faults in natural gas reforming hydrogen production system
  • Method for detecting and disposing faults in natural gas reforming hydrogen production system
  • Method for detecting and disposing faults in natural gas reforming hydrogen production system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: The temperature of the reformer is low.

[0039]The monitoring point 101 of the reformer temperature sends the monitoring signal to the PLC, and the PLC converts the monitoring signal into a measured value and sends it to the computer, and the computer obtains the measured value: T 实测 =700°C, the preset value T of the reformer temperature is preset in the computer 设定 =780℃, according to T 实测 设定 , the computer judged that the temperature of the reformer was low. In this embodiment, calculation processing is performed by the following method.

[0040] Calculation: △V=(△T / T 设定 ) × V 总 =0.43m 3 / h;

[0041] △Vair=λ△V=4.3 m 3 / h.

[0042] In the formula: △T is the difference between the temperature preset value and the measured temperature value; △V is the volume flow rate of natural gas for combustion that needs to be increased; T 设定 is the preset reformer temperature; V 总 is the initial volume flow rate of natural gas for combustion, V 总 =4.2m 3 / ...

Embodiment 2

[0044] Embodiment 2: Fault due to high sulfur content.

[0045] The monitoring point 106 of the natural gas composition after desulfurization sends the monitoring signal to the PLC, and the PLC converts the monitoring signal into a measured value and sends it to the computer, and the computer obtains the measured value of the sulfur content of the natural gas after desulfurization: S 实测 =8ppb, the preset value S of sulfur content in natural gas after desulfurization is preset in the computer 设定 =4ppb, according to S 实测 >S 设定 , the computer judged that a high sulfur content fault occurred.

[0046] According to △S=8-4=4ppb, the computer judges that the desulfurization treatment capacity needs to be doubled.

[0047] The computer sends instructions to the desulfurizer electric flow regulating valve 701 on a spare desulfurization pipeline through the PLC, so that the desulfurizer electric flow regulating valve 701 on the spare desulfurization pipeline is opened to a certain op...

Embodiment 3

[0048] Embodiment 3: The temperature of the carbon monoxide converter is too high and the fault occurs.

[0049] The monitoring point 102 of the temperature of the carbon monoxide converter sends the monitoring signal to the PLC, and the PLC converts the monitoring signal into a measured value and sends it to the computer, and the computer obtains the measured value of the temperature of the carbon monoxide converter: T 实测 =300℃, the preset value T of the carbon monoxide converter temperature is preset in the computer 设定 =280℃, according to T 实测 >T 设定 , the computer judges that the temperature of the carbon monoxide converter is too high. In this embodiment, calculation processing is performed by the following method.

[0050] Calculation: △V=(△T / T 设定 ) × V 导热油 =0.07 m / s.

[0051] In the formula: △T is the difference between the preset value and the measured value of the carbon monoxide converter temperature, △T=20℃; T 设定 is the preset value of carbon monoxide converter...

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Abstract

The invention discloses a method for detecting and disposing faults in a natural gas reforming hydrogen production system. The method comprises the following steps of fault monitoring, fault judgementand fault processing. When a temperature anomaly fault of a reformer, a temperature anomaly fault of a carbon monoxide converter, the fault of slightly high sulfur content or the fault of slightly small finished product hydrogen flow occurs, the faults can be automatically disposed. When a raw material natural gas component anomaly fault and / or a hydrogen leakage fault and / or the fault of low finished hydrogen purity and / or a primary reforming gas component anomaly fault and / or a converted gas component anomaly fault occurs, safe shutdown is performed, and accordingly catalysts in the reformer, the carbon monoxide converter and a desulfurization mechanism are protected. The method has the advantages that the fault caused by simple reasons can be automatically removed, shutdown is avoided,and accordingly the hydrogen production efficiency is greatly improved; for faults caused by complicated reasons and needing shutdown, safe shutdown is carried out, the catalysts can be effectively prevented from being contaminated, and economic losses are avoided.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by reforming natural gas. Background technique [0002] The structure of the current natural gas reforming hydrogen production system mainly includes: a reformer installed in the equipment installation shell, a carbon monoxide converter, and a pressure swing adsorber. A pair of buffer storage tanks are connected to the reformer—natural gas for combustion The buffer storage tank and the natural gas buffer storage tank for reaction, the input ends of a pair of buffer storage tanks are connected with the natural gas transmission main pipe, the raw natural gas is input from the natural gas transmission main pipe, the output end of the natural gas buffer storage tank for combustion is connected with the shell of the reformer The burner in the body is connected, and the output end of the natural gas buffer storage tank for reaction is connected with the reactor in the reformer through the de...

Claims

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Application Information

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IPC IPC(8): C01B3/38G05B19/05
CPCG05B19/054C01B3/38C01B2203/0233C01B2203/0283C01B2203/1241C01B2203/1609
Inventor 吕青青丁桓展唐健严岩魏蔚熊波王朝
Owner ZHANGJIAGANG RES INST OF HYDROGEN ENERGY CO LTD
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