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Method and device for purifying liquid ammonia decomposition gas

A purification method and a technology for decomposing gas, which are applied in the directions of using liquid contact hydrogen separation, hydrogen separation, hydrogen production, etc., which can solve the problems of reduced performance of cemented carbide and great influence of cemented carbide performance.

Inactive Publication Date: 2013-02-13
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impurity sulfur in cobalt powder has a great influence on the performance of cemented carbide, and excessive sulfur impurities can greatly reduce the performance of cemented carbide

Method used

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  • Method and device for purifying liquid ammonia decomposition gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The following describes the purification method of the liquid ammonia decomposition gas described in the application for the invention with reference to the device, and the method includes the following steps:

[0025] 1. Liquid ammonia vaporization: liquid ammonia is stored in the liquid ammonia storage tank, and is vaporized through the liquid ammonia evaporator in the vaporization chamber and the buffer storage tank. The liquid ammonia enters the liquid ammonia evaporator and contacts the heat exchange fins, so that the temperature of the liquid ammonia rises. Vaporization is carried out at a temperature of up to 20°C, the pressure is controlled at 0.2Mpa, the heat exchange source is water vapor, and the liquid ammonia enters the buffer storage tank after vaporization to maintain a stable supply of ammonia gas, and the outlet pressure is controlled to 0.3 Mpa by a pressure reducing valve;

[0026] 2. Ammonia decomposition: After the liquid ammonia is vaporized, it is ...

Embodiment 2

[0031] Described method comprises the steps:

[0032]1. Liquid ammonia vaporization: liquid ammonia is stored in the liquid ammonia storage tank, and is vaporized through the liquid ammonia evaporator in the vaporization chamber and the buffer storage tank. The liquid ammonia enters the liquid ammonia evaporator and contacts the heat exchange fins, so that the temperature of the liquid ammonia rises. The temperature is as high as 40°C for vaporization, the pressure is controlled at 0.5Mpa, the heat exchange source is hot water, and the liquid ammonia enters the buffer storage tank after vaporization to maintain a stable supply of ammonia gas, and the outlet pressure is controlled to 0.4 Mpa through the pressure reducing valve;

[0033] 2. Ammonia decomposition: After the liquid ammonia is vaporized, it is decomposed in the ammonia decomposition furnace. The ammonia decomposition furnace is composed of a preheater and a catalytic decomposer. The gas enters the catalytic decompo...

Embodiment 3

[0038] Described method comprises the steps:

[0039] 1. Liquid ammonia vaporization: liquid ammonia is stored in the liquid ammonia storage tank, and is vaporized through the liquid ammonia evaporator in the vaporization chamber and the buffer storage tank. The liquid ammonia enters the liquid ammonia evaporator and contacts the heat exchange fins, so that the temperature of the liquid ammonia rises. The temperature is as high as 30°C for vaporization, the pressure is controlled at 0.3Mpa, the heat exchange source is hot water, and the liquid ammonia enters the buffer storage tank after vaporization to maintain a stable supply of ammonia gas, and the outlet pressure is controlled to 0.4 Mpa by a pressure reducing valve;

[0040] 2. Ammonia decomposition: After the liquid ammonia is vaporized, it is decomposed in the ammonia decomposition furnace. The ammonia decomposition furnace is composed of a preheater and a catalytic decomposer. The gas enters the catalytic decomposer, i...

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Abstract

The invention provides a device for purifying liquid ammonia decomposition gas, and the device comprises a liquid ammonia storage tank, a vaporizing chamber, an ammonia decomposition furnace, a purifier, a cyclone separator, and a drier, wherein the vaporizing chamber comprises a liquid ammonia evaporator and a buffering storage tank; the ammonia decomposition furnace comprises a preheater and a catalytic decomposer; the liquid ammonia storage tank is connected with the liquid ammonia evaporator; the liquid ammonia evaporator is connected with the buffering storage tank, and then orderly connected with the preheater, the catalytic decomposer, the purifier, the cyclone separator and the drier; the drier comprises a water-vapor absorption layer and an organic adsorption layer; liquid ammonia is vaporized and introduced into the ammonia decomposition device to obtain hydrogen nitrogen mixed gas containing little residual ammonia and impurities such as sulfur; the mixed gas is introduced into an alkaline solution through a gas distribution pipe to absorb impurities such as sulfur and NH3 in the mixed gas; the purified gas is separated, and the separated gas contains a few liquid drops; the liquid drops [S1] return to the purifier for circular purification; the separated gas is dried by the drier to obtain high-purity hydrogen nitrogen mixed gas.

Description

technical field [0001] The application of the present invention relates to a method for purifying liquid ammonia decomposition gas and its equipment, belonging to the technical field of chemical industry. Background technique [0002] Hydrogen is used in industries such as powder metallurgy and float glass, and the production of hydrogen from the decomposition of liquid ammonia is widely used due to its cost advantage. However, raw materials for liquid ammonia synthesis, such as natural gas, water gas, and heavy oil, all contain a small amount of sulfide. Although most of the sulfur is removed through processes such as hydrogenation conversion and zinc oxide desulfurization, a very small amount is brought into the finished liquid ammonia. [0003] In the prior art, after desulfurization by crystallization adsorption method, the H in liquid ammonia is controlled 2 S content≤5mg / kg, S impurity in liquid ammonia divided by H 2 In addition to the S form, a small amount exists ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04C01B3/52
CPCY02E60/364Y02E60/36
Inventor 苏陶贵何显达李杨郭苗苗许强王勤
Owner GEM CO LTD
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