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Low-energy-consumption high-yield method for preparing hydrogen from raw gas

A raw gas, high-yield technology, applied in chemical instruments and methods, sulfur preparation/purification, hydrogen, etc., can solve the problems of combustible gas waste in the analysis gas, low hydrogen yield, analysis gas treatment, etc., to achieve protection Adsorbent, reduce investment, effect of desulfurization and deoxidation adsorbent

Inactive Publication Date: 2018-03-06
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can effectively solve the problems of high energy consumption and low hydrogen yield in the prior art, and improve the calorific value of the analytic gas in the hydrogen production process from raw coal gas, and overcome the inability to further process the analytic gas in the hydrogen production process from raw coal gas. The disadvantage of causing the waste of combustible gas in the analysis gas; and by-products such as sulfur and pure nitrogen, realize the high-value utilization of raw gas, and further improve the enthusiasm of enterprises to use raw gas

Method used

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  • Low-energy-consumption high-yield method for preparing hydrogen from raw gas
  • Low-energy-consumption high-yield method for preparing hydrogen from raw gas
  • Low-energy-consumption high-yield method for preparing hydrogen from raw gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 2 As shown, a low energy consumption, high yield raw gas hydrogen production process, followed by the following operations:

[0055] 1) Pre-purification: The raw gas from the gas cabinet is pressurized to 30kpa by the fan, enters from the lower part of the washing tower, contacts with the washing liquid countercurrently, and enters the electrostatic coke catcher after being washed. More than 93% of the tar is removed, and the tar content is about 50mg / m3.

[0056] 2) Naphthalene removal: The pre-purified raw coal gas is compressed to 0.3MPag in one stage, and enters the naphthalene removal unit from the bottom of the naphthalene removal tower. The naphthalene removal unit is composed of 4 purification towers and 1 regeneration heater; 2 of which are adsorption towers It is in the state of adsorption, and the rest of the adsorption towers are in the state of regeneration. The adsorption tower is operated alternately to ensure the continuous entry of raw...

Embodiment 2

[0064] Such as image 3 As shown, a low energy consumption, high yield raw gas hydrogen production process, followed by the following operations:

[0065] The raw gas from the gas cabinet is pressurized to 30kpa by the fan, washed by the water washing tower and then enters the electrostatic coke catcher. More than 93% of the tar is removed, and the tar content is about 50mg / m3. After one-stage compression to 0.5MPag, it enters the naphthalene removal unit from the bottom of the naphthalene removal tower. The naphthalene removal unit is composed of 3 purification towers and 1 regeneration heater; 1~2 adsorption towers are in the adsorption state, and the rest of the adsorption towers are in the regenerative state. The adsorption tower is operated alternately to ensure the continuous entry of raw gas; after naphthalene removal, the naphthalene content is less than 20mg / m3. Then through two-stage compression to 1.0MPag, it enters the process of shifting and degassing. It is he...

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Abstract

The invention discloses a low-energy-consumption high-yield method for preparing hydrogen from raw gas. The method comprises the following procedures: pre-cleaning; naphthalene removal; transformationand desulfurization; sulfur recovery; refined debenzolization; pressure swing adsorption for hydrogen production; recovery of tail gas; nitrogen production; etc. After pretreatment and naphthalene removal, raw gas is allowed to enter the procedure of transformation and desulfurization so as to obtain more hydrogen and increase the yield of hydrogen, and then desulfurization is carried out in a desulfurization tower; then pure hydrogen is prepared through the procedure of refined debenzolization and the procedure of pressure swing adsorption for hydrogen production; through the procedures of tail gas recovery and nitrogen production, effective hydrogen in desorbed gas is recovered, and hydrogen yield is further increased; and pure nitrogen with a purity of 99% or more is further prepared through a nitrogen production unit. The method provided by the invention substantially reduces the energy consumption of an apparatus for hydrogen production from raw gas, increases hydrogen yield, recovers almost all the effective hydrogen component in the desorbed gas, realizes recovery and graded utilization of each component in the raw gas while guaranteeing low energy consumption and high yield, and by-produces sulfur, pure nitrogen and the other products while preparing pure hydrogen.

Description

technical field [0001] The invention belongs to the field of hydrogen production, and more specifically relates to a method for preparing hydrogen from raw coal gas. Background technique [0002] Coke oven gas (COG) is a high-quality resource. It is a combustible gas obtained while producing coke and tar products in the coking process, and is the most important by-product in the coking process. The production of 1 ton of coke can produce about 42516m3 of coke oven gas. Coke oven gas can be divided into crude gas and clean gas. The unrecovered chemical products and unpurified coke oven gas overflowing from the coke oven riser are called raw gas or crude gas. [0003] Raw coal gas is the unpurified gas product precipitated in the coal dry distillation process, mainly including about 25% hydrogen by volume, about 38% nitrogen by volume, about 7% methane by volume, about 10% carbon monoxide by volume, and 12% by volume About carbon dioxide, 7.9% water by volume, and a small a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/16C01B3/56C01B21/04C01B17/04
CPCC01B3/16C01B3/56C01B17/04C01B21/045C01B2210/0014C01B2210/0051C01B2210/0053C01B2210/0064C01B2210/0068Y02P20/52
Inventor 钟雨明刘开莉钟娅玲蔡跃明牟树荣王波
Owner SICHUAN TECHAIRS
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