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A hydrogen deoxygenation process system and method

A process system, hydrogen technology, applied in chemical instruments and methods, hydrogen/synthesis gas production, hydrogen separation, etc., can solve problems such as load reduction or parking, low catalyst life, uneven distribution, etc., to reduce operating costs and save Operating costs, the effect of avoiding local overheating

Active Publication Date: 2021-11-16
HUNAN HENGGUANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The catalyst of the deaerator is unevenly distributed, and the hydrogen gas appears to be biased and unevenly distributed when the bulk catalyst section is descending;
[0006] 2. The reaction temperature of the catalyst in the middle of the deaerator is high, the temperature of the cylinder wall is low, the heat in the middle cannot be removed in time, the catalyst heats up and the filler is sintered, and the life of the catalyst is low;
[0007] 3. The applicability of the system to deal with hydrogen with high oxygen content is not strong, and it cannot be adjusted with the change of oxygen content. The purity of hydrogen after treatment is not guaranteed, and the quality is poor;
[0008] 4. The utilization rate of the catalyst in the system is poor, so that a device with the same scale of hydrogen production needs more catalyst, and the initial investment of the device is higher;
[0009] 5. It is necessary to reduce the load or shut down the deaerator for leakage, maintenance and catalyst replacement

Method used

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  • A hydrogen deoxygenation process system and method

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Comparison scheme
Effect test

Embodiment 1

[0043] attached figure 1 It is a structural schematic diagram of the hydrogen deoxygenation process system provided by the present invention. The hydrogen deoxygenation process system of the present invention includes 1-the first deaerator, 2-the second deaerator, 3-the third deaerator, 4-the fourth deaerator, 5-standby deaerator, 6- The first washing tower, 7-the second washing tower, 8-circulating vacuum pump, 9-turbulent fan.

[0044] The hydrogen to be deoxygenated comes from the hydrogen inlet pipe of the 18-deoxygenation system, and enters the 1-first deaerator by opening the 10-first deaerator inlet valve. At this time, the other valves at the 1-first deaerator inlet are closed. Open 11-the first deaerator outlet valve to leave 1-the first deaerator, at this time 1-the other valves at the first deaerator outlet are closed; 1-the first deaerator outlet is connected through a pipeline 2-the second deaerator The inlet of the deaerator enters the 2-second deaerator by ope...

Embodiment 2

[0048] Based on the hydrogen deoxygenation process system of embodiment 1, the hydrogen deoxygenation process method provided by the present invention comprises the following steps:

[0049] When the hydrogen deoxygenation system is started, the hydrogen processing capacity is set at 2000Nm 3 / h, the hydrogen delivery pipe at the outlet of the second water washing tower is not sent to the user, and all are safely emptied. Hydrogen with an oxygen concentration of 2.3-2.5% enters the first deaerator, and under the catalysis of nearly scrapped palladium catalyst, oxygen and hydrogen react to form water. When the oxygen concentration in the hydrogen at the outlet of the oxygen device is 2.2-2.4%, and the temperature is 90-110°C, the heat balance is achieved by the hydrogen itself removing heat, and at the same time, chloride ions and other impurities in the hydrogen are intercepted by the low-activity palladium catalyst;

[0050] Hydrogen with an oxygen concentration of 2.2-2.4% ...

Embodiment 3

[0056] Based on the hydrogen deoxygenation process system of embodiment 1, the hydrogen deoxygenation process method provided by the present invention, the switching steps of the deaerator are as follows:

[0057] After the first deaerator has been used for three months as required, the catalyst and ceramsite have adsorbed a large amount of impurities. When the outlet temperature is lower than 65°C, it is judged that the catalyst is scrapped, and the standby deaerator is switched to enter the deaerator. The system goes into production.

[0058] Open the outlet valve of the fourth deaerator in the outlet of the standby deaerator, and slowly open the inlet valve of the fourth deaerator in the inlet of the standby deaerator. Four deaerators. Close the fourth deaerator inlet valve in the existing fourth deaerator inlet, and close the fourth deaerator outlet valve in the existing fourth deaerator outlet. At this time, it becomes a standby deaerator (the original fourth deaerator ...

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Abstract

The invention discloses a hydrogen deoxygenation process system, comprising a first deaerator, a second deaerator, a third deaerator, a fourth deaerator, a standby deaerator, a first water washing tower, a second water washing tower The tower and the circulating vacuum pump for direct cooling and the turbo fan for indirect cooling. After the oxygen-containing hydrogen is pressurized, it passes through the first and second deaerators for catalytic deoxygenation, and then enters the first water washing tower for cooling and dehydration, and continues to enter the The third and fourth deaerators carry out catalytic deoxygenation, and the qualified hydrogen is then sent to users through the second water washing tower to cool down and remove water. The invention provides a process system for deoxygenation with a palladium catalyst deaerator, which makes the hydrogen gas with gradually reduced oxygen concentration contact with the palladium catalyst with gradually enhanced activity, so as to reduce the final oxygen concentration of hydrogen gas, reduce the catalytic reaction intensity, and prolong Catalyst life, to avoid direct reaction of high-concentration oxygen in hydrogen with high-activity catalysts to cause local overheating and deactivation of catalysts, ensuring safe and stable operation of the device. The invention also provides a process method for hydrogen deoxygenation.

Description

technical field [0001] The invention relates to the technical field of hydrogen purification production technology, in particular to a hydrogen deoxygenation process system and method. Background technique [0002] Many hydrogenation products need to use hydrogen from chlor-alkali, sodium chlorate and other devices in the production process, and the by-product hydrogen contains a certain amount of oxygen and a small amount of chlorine. The existence of oxygen is very dangerous to the production process of hydrogenation products Yes, once oxygen accumulates in the production process, it will cause an explosion accident; chlorine gas is also dangerous in the production process, and once a certain concentration of chlorine gas enters the hydrogen gas, it will cause catalyst poisoning; therefore, before the hydrogen gas enters the hydrogenation unit, it must be Remove most of the oxygen and chlorine. The hydrogen deoxygenation system is a key process in the hydrogen purificatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/58C01B3/50
CPCC01B3/50C01B3/58C01B2203/0435C01B2203/0465
Inventor 易重庆伍小望彭发权胡建新贺学军
Owner HUNAN HENGGUANG TECH