Technique for producing synthetic ammonia gas by inputting nitrogen-rich air into two-stage converter in membrane method

A two-stage reforming and air input technology, which is used in the field of hydrocarbon steam reforming to achieve the effects of reducing combustion, improving operating flexibility and improving fuel utilization.

Active Publication Date: 2010-09-08
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above three devices are used in the synthetic ammonia gas production process, they usually only use their function of enriching oxygen

Method used

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  • Technique for producing synthetic ammonia gas by inputting nitrogen-rich air into two-stage converter in membrane method
  • Technique for producing synthetic ammonia gas by inputting nitrogen-rich air into two-stage converter in membrane method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Use the four-stage air compressor 1 to pressurize the process air step by step to 3.49Mpa(g), use the gas-liquid separation tank to separate the liquid produced by each stage of compression, and use the interstage cooler to cool the air to 153? , the flow rate and composition of the compressed air are shown in Table 1 below:

[0019] components

N 2

O 2

Ar

Dry basis composition / %

78.10

20.95

0.95

[0020] When nitrogen-enriched air is not used, all the compressed air is directly preheated to 484° C. by the air preheater 5 and then enters the secondary reformer 6 . Another feed to the secondary reformer is the process gas from the primary reformer, with a temperature of 822°C, a pressure of 3.20Mpa(g), and a flow rate of 4200.65kmol / h. The composition is shown in Table 2 below:

[0021] components

CH 4

N 2

H 2

Ar

CO 2

CO

Dry basis composition / %

...

Embodiment 2

[0027] Use the four-stage air compressor 1 to pressurize the process air to 3.49Mpa(g) step by step, use the gas-liquid separation tank to separate the liquid produced by each stage of compression, and use the interstage cooler to cool the air to 153°C. Then part of the compressed air is adjusted to a temperature of 40°C through the cooler 2, and after impurities are removed by the precision filter 3, it enters the hollow fiber oxygen nitrogen membrane separator 4. Since the oxygen in the compressed air is preferentially permeated in the polymer membrane material, oxygen-enriched air is obtained on the permeate side of the membrane separator, and nitrogen-enriched air is obtained on the retentate side. After being separated by the membrane separator, the nitrogen-enriched air concentration on the retentate side is about 80% (mole fraction, the same below), and the oxygen-enriched air concentration on the permeate side is about 30%. The oxygen-enriched air obtained from the per...

Embodiment 3

[0032] Use the four-stage air compressor 1 to pressurize the process air to 3.49Mpa(g) step by step, use the gas-liquid separation tank to separate the liquid produced by each stage of compression, and use the interstage cooler to cool the air to 153°C. Then let part of the compressed air go through the cooler 2 to adjust the temperature to 40°C, and then enter the hollow fiber oxygen nitrogen membrane separator 4 after the precision filter 3 removes impurities. Since the oxygen in the compressed air is preferentially permeated in the polymer membrane material, oxygen-enriched air is obtained on the permeate side of the membrane separator, and nitrogen-enriched air is obtained on the retentate side. After being separated by the membrane separator, the nitrogen-enriched air concentration on the retentate side is about 90% (mole fraction, the same below), and the oxygen-enriched air concentration on the permeate side is about 28%. The oxygen-enriched air obtained from the permea...

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Abstract

The invention discloses a technique for producing synthetic ammonia gas by inputting nitrogen-rich air into a two-stage converter in a membrane method, and is characterized in that a portion of air enters a membrane separator after the air is compressed. The nitrogen-rich air obtained at the permeation residue side of the membrane separator can be directly mixed with outlet air of an air compressor so as to be used as plant air which enters the two-stage converter after being heated by high-temperature flue gas through an air pre-heater. The nitrogen-rich concentration in the plant air and theheat load of the air pre-heater are regulated so as to ensure appropriate H / N ratio and high methane conversion rate in the two-stage converter. The nitrogen-rich air obtained at the permeation residue side of the membrane separator is added into a one-stage converter to assist combustion so that the fuel utilization rate of natural gas is increased. The technique reduces the burning capacity ofhydrogen in the two-stage converter and increases the material utilization rate of natural gas by pre-heating the plant air to a higher temperature in the air pre-heater.

Description

technical field [0001] The invention relates to a hydrocarbon steam reforming process, in particular to a hydrocarbon steam reforming process in a second-stage reformer for producing synthetic ammonia raw material gas by using hydrogen combustion heat to supply hydrocarbons for deep reforming. Background technique [0002] Synthetic ammonia is a pillar industry of the national economy, and its output ranks first among various chemical products. At the same time, it is also a big energy consumer. About 10% of the world's energy is used for ammonia synthesis. About 90% of the energy consumption of synthetic ammonia production is concentrated in two parts: raw material energy consumption and fuel energy consumption. With the aggravation of the energy crisis, improving the raw material utilization rate of natural gas in ammonia plants has become an important way to save energy and reduce consumption in ammonia plants. [0003] The second-stage reformer is one of the main equip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/02C01B21/04
CPCY02P20/129
Inventor 吴雪梅贺高红汪启富郭瑞华何振石瑜柏学森陈思
Owner DALIAN UNIV OF TECH
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