CN1313240A - High-pressure methanation process for raw gas of synthetic ammonia - Google Patents
High-pressure methanation process for raw gas of synthetic ammonia Download PDFInfo
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- CN1313240A CN1313240A CN 00113314 CN00113314A CN1313240A CN 1313240 A CN1313240 A CN 1313240A CN 00113314 CN00113314 CN 00113314 CN 00113314 A CN00113314 A CN 00113314A CN 1313240 A CN1313240 A CN 1313240A
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- synthetic ammonia
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- raw gas
- methanation process
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Abstract
A high-pressure methanating process for the raw gas of synthetic ammonia features that the overheat steam at 1.27 MPa is used to heat the raw gas at 31.4 MPa. Its advantages include low energy consumption and cost, and reuse of steam from afterheat boiler in urea step to decrease the investment to equipment.
Description
The present invention relates to middle-size and small-size nitrogen fertilizer plant refining process for synthetic ammonia raw material gas, particularly high-pressure methanation process for raw gas of synthetic ammonia.
At present, the syngas for synthetic ammonia of middle-size and small-size nitrogen fertilizer plant use is sent into the synthetic ammonia synthesizing section after all will making with extra care by processing steps such as conversion, decarburization, smart desulfurization, methanolizing and methanations.But existing methanation process exists following problem: (1), after the methanation, CO+CO in the refinery gas
2Content influences the purity of unstripped gas generally at 15-20PPM, and ammonia synthesis system emptying amount is increased; (2), adopt 12.7MPa methanation process speed of response slow, restricted throughput; In order to address the above problem, the high-pressure deep purification technology of ammonia-synthesizing material gas that Chinese patent (CN1152022A) provides, its unstripped gas after with middle pressure connection alcohol or the decarburization unstripped gas after smart desulfurization, carry out high pressure methanolizing and high-pressure methanation reaction through the compressor pressurize of oil-free lubricatoin technology to 24.0-31.4MPa, though this patented technology has solved CO+CO in the refinery gas
2The problem that content is high makes CO+CO in the refinery gas
2Content≤10PPM, and accelerated the speed of response of methanation, improved throughput, but, can not keep autothermal equilibrium because methanation process reaction heat is little, need push away electric furnace production, cause the energy consumption height, improved the production cost of synthetic ammonia.
The purpose of this invention is to provide a kind of high-pressure methanation process for raw gas of synthetic ammonia, to solve the high problem of electric furnace production energy consumption that pushes away that exists in the existing refining raw-material gas for synthesis of ammonia process.
For achieving the above object, the technical solution adopted in the present invention is: high-pressure methanation process for raw gas of synthetic ammonia, it is characterized in that and to send into waste heat boiler through the 31.4MPa unstripped gas after the recirculation heater heating that described waste heat boiler feeds the 1.27MPa superheated vapo(u)r with heating 31.4MPa unstripped gas.
High-pressure methanation process for raw gas of synthetic ammonia provided by the present invention, employing feeds 1.27MPa superheated vapour heating 31.4MPa unstripped gas in waste heat boiler, replaced and pushed away electric furnace production, for unstripped gas provides the higher-grade thermal source, kept the thermal equilibrium of system, reduced energy consumption, thereby reduced the production cost of synthetic ammonia, the steam that goes out waste heat boiler simultaneously can send urea workshop section again, has saved the steam saturator of urea workshop section, has reduced the facility investment of synthetic ammonia.
Embodiment: high-pressure methanation process for raw gas of synthetic ammonia, it will be from the 31.4MPa unstripped gas of compression section after the oil separator separating oil, enter annular space by methanator top, after the annular space heating, remove recirculation heater, 31.4MPa unstripped gas is sent into waste heat boiler after the recirculation heater heating, waste heat boiler feeds 1.27MPa, 250-350 ℃ of superheated vapour heating 31.4MPa unstripped gas, 31.4MPa unstripped gas after the heating enters methanator, in methanator, a spot of CO and CO in the 31.4MPa unstripped gas
2Under the effect of methanation catalyst respectively with H
2Reaction generates methane and water, and the gas that goes out methanator enters the water cooler that anhydrates after the recirculation heater cooling, and the separator that anhydrates after water cooling divides the gas deammoniation synthesizing section as a supplement of the gas after dried up.
Claims (2)
1, high-pressure methanation process for raw gas of synthetic ammonia is characterized in that the 31.4MPa unstripped gas after the recirculation heater heating enters the waste heat boiler heating; Described waste heat boiler feeds the 1.27MPa superheated vapour with heating 31.4MPa unstripped gas.
2, high-pressure methanation process for raw gas of synthetic ammonia according to claim 1, the temperature that it is characterized in that described superheated vapour is 250-350 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00113314 CN1313240A (en) | 2000-03-09 | 2000-03-09 | High-pressure methanation process for raw gas of synthetic ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00113314 CN1313240A (en) | 2000-03-09 | 2000-03-09 | High-pressure methanation process for raw gas of synthetic ammonia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1313240A true CN1313240A (en) | 2001-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00113314 Pending CN1313240A (en) | 2000-03-09 | 2000-03-09 | High-pressure methanation process for raw gas of synthetic ammonia |
Country Status (1)
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| CN (1) | CN1313240A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603453A (en) * | 2012-02-15 | 2012-07-25 | 山东洪达化工有限公司 | Device and method for increasing temperature of decarburization gas at inlet of synthesis ammonia methanation furnace |
-
2000
- 2000-03-09 CN CN 00113314 patent/CN1313240A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603453A (en) * | 2012-02-15 | 2012-07-25 | 山东洪达化工有限公司 | Device and method for increasing temperature of decarburization gas at inlet of synthesis ammonia methanation furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |