CN210559363U - Synthetic ammonia conversion system capable of improving productivity - Google Patents
Synthetic ammonia conversion system capable of improving productivity Download PDFInfo
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- CN210559363U CN210559363U CN201921576676.XU CN201921576676U CN210559363U CN 210559363 U CN210559363 U CN 210559363U CN 201921576676 U CN201921576676 U CN 201921576676U CN 210559363 U CN210559363 U CN 210559363U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model discloses an improve synthetic ammonia conversion system of productivity, the natural gas that comes out from lower part heat exchange coil outlet pipeline gets into from the top of pre-reformer, fill conversion catalyst in the pre-reformer, the bottom reborned gas outlet of pre-reformer links to each other with the cold side import of heater, the hot side import of heater links to each other with the tail gas discharge pipeline of the boiler of starting work who produces middling pressure steam, the hot side export of heater links to each other with the reformer import of heat transfer formula reformer, the reformer export of heat transfer formula reformer links to each other with the upper portion gas inlet of two-stage furnace, the bottom gas outlet of two-stage furnace links to each other with the shell side import of heat transfer formula reformer, middling pressure steam that the boiler of starting work produced removes middling pressure steam pipe network. The utility model discloses an increase in current conversion system in advance reborner, heater and medium pressure steam boiler, carry on earlier with the conversion to the gas mixture, reduce the production load of follow-up reborner, guarantee that the conversion is thorough, satisfy the demand that synthetic ammonia expands the ability.
Description
Technical Field
The utility model relates to a synthetic ammonia conversion system for improving productivity, which belongs to the field of synthetic ammonia.
Background
The total flow of the process for synthesizing ammonia in a nitrogenous fertilizer plant is as follows: the natural gas from the long-distance pipeline firstly enters a natural gas distribution station, the natural gas enters a normal-temperature desulfurization system of a synthetic ammonia device after being buffered and pressure-regulated in the distribution station, and then passes through the natural gasGas compression, high-temperature desulfurization, heat exchange type first-stage steam conversion, second-stage oxygen-enriched air conversion, carbon monoxide high-temperature and low-temperature conversion, decarbonization by an improved hot potash process, methanation and deep purification to remove residual CO and CO2Compressing the synthesis gas, synthesizing ammonia under 14.0MPa, and freezing and separating to obtain the product liquid ammonia.
At present, the conversion system is: the process natural gas boosted by the compressor firstly enters the upper heat exchange coil of the natural gas heating furnace to be heated, the process natural gas leaves the heating furnace after being heated, the process natural gas is mixed with the process natural gas from the temperature adjusting pipeline (branch pipe of the process natural gas pipeline) and then enters the middle heat exchange coil of the natural gas heating furnace to be continuously heated, the process natural gas enters the desulfurizing tank after being heated to 330-335 ℃, most of sulfur in the process natural gas is removed by the ferro-manganese desulfurizer, and then the process natural gas enters the zinc oxide desulfurizing tank to be continuously subjected to fine desulfurization until the sulfur content in the process natural gas is reduced to be less than 0.2 PPM. The process natural gas coming out from the bottom of the zinc oxide tank is mixed with medium-pressure steam and then enters a lower coil of a natural gas heating furnace for heating, and the mixed gas is heated to about 450 ℃ and then enters a heat exchange type conversion furnace (a temperature adjusting auxiliary line and a valve are arranged on a mixed gas pipeline). The natural gas is converted in a converter tube in the furnace, and converted gas (CH4 is less than 35%) coming out of the converter tube enters a secondary furnace for deep conversion again. Oxygen-enriched air enters from the top of the secondary furnace, and oxygen in the oxygen-enriched air and H in the converted gas2Burning in the furnace, supplying the high temperature generated by burning to the furnace gas for deep conversion, and converting gas (CH) from the secondary furnace4Less than 0.35%) into the shell side of the heat-exchange reformer, the high-temperature gas is used for supplying natural gas in the reformer tube for conversion, and finally the converted gas coming out from the bottom of the shell side of the reformer is sent to a conversion boiler.
The bottom of the natural gas heating furnace is provided with a fuel natural gas pipeline, the fuel natural gas is conveyed to a bottom burner of the heating furnace through the pipeline to be combusted, and the temperature of the heating furnace is realized by combusting the fuel natural gas to heat.
The prior conversion system faces incomplete conversion of a heat exchange type converter and a secondary furnace when improving the capacity of synthetic ammonia, the converted gas from the secondary furnace can not meet the requirement (CH4 is less than 0.35 percent), and the conversion system restricts the capacity expansion of the synthetic ammonia.
SUMMERY OF THE UTILITY MODEL
In view of the above technical problem, an object of the present invention is to provide a synthetic ammonia conversion system capable of improving productivity, which can improve conversion efficiency and satisfy conversion requirements when expanding the energy of synthetic ammonia.
In order to realize the purpose, the technical scheme of the utility model is that: a synthetic ammonia conversion system for improving productivity comprises a natural gas converter, a heat exchange type converter, a secondary furnace, a desulfurization tank and a zinc oxide tank, wherein an upper heat exchange coil, a middle heat exchange coil and a lower heat exchange coil are sequentially arranged in the natural gas converter from top to bottom, an outlet of a process natural gas pipeline connected with an outlet of a compressor is connected with an inlet of the upper heat exchange coil, the process natural gas pipeline is divided into a temperature adjusting pipeline, natural gas of the temperature adjusting pipeline and natural gas coming out of the upper heat exchange coil are mixed and adjusted in temperature and then enter the middle heat exchange coil, the natural gas coming out of the middle heat exchange coil sequentially enters the desulfurization tank and the zinc oxide tank for desulfurization, and the desulfurized natural gas and medium-pressure steam are mixed and then enter the lower heat exchange coil for continuous heating, and the synthetic ammonia conversion system is: the natural gas from the outlet pipeline of the lower heat exchange coil enters from the top of a pre-reformer, a reforming catalyst is filled in the pre-reformer, a bottom reformed gas outlet of the pre-reformer is connected with a cold side inlet of a heater, a hot side inlet of the heater is connected with a tail gas discharge pipeline of a start-up boiler producing medium-pressure steam, a hot side outlet of the heater is connected with a reformer inlet of a heat exchange reformer, a reformer outlet of the heat exchange reformer is connected with an upper gas inlet of a secondary boiler, a bottom gas outlet of the secondary boiler is connected with a shell side inlet of the heat exchange reformer, and the medium-pressure steam produced by the start-up boiler goes to a medium-pressure steam pipe network.
By adopting the scheme, the mixed gas coming out of the natural gas heating furnace firstly enters the pre-reforming furnace and is converted under the action of the conversion catalyst, so that part of the natural gas is converted into H2、CO、CO2Thereby reducing the production load of the subsequent converter, ensuring thorough conversion and meeting the energy expansion requirement of the synthetic ammonia.
The temperature of the mixed gas after conversion in the pre-converter is reduced, a heater is additionally arranged behind the pre-converter to heat the discharged mixed gas, and the temperature of the mixed gas entering the heat exchange type converter is ensured to be 450 ℃.
On one hand, the problem of insufficient medium-pressure steam caused by energy expansion is solved by additionally arranging a medium-pressure steam boiler. On the other hand, the tail gas of the medium-pressure steam boiler is used for heating the mixed gas in the heater, and the waste heat is recycled, so that the aims of saving energy and reducing consumption are fulfilled.
In the scheme, the method comprises the following steps: the desulfurization tank is two, is desulfurization tank A and desulfurization tank B respectively, and the import of two desulfurization tanks all links to each other with the middle part heat exchange coil export of natural gas heating furnace, and the export of two desulfurization tanks all links to each other with zinc oxide tank import.
In the scheme, the method comprises the following steps: and a valve is arranged on the temperature adjusting pipeline.
In the scheme, the method comprises the following steps: the outlet pipeline of the zinc oxide tank is connected with a medium-pressure steam pipeline, the outlet pipeline of the zinc oxide tank is divided into a mixed gas temperature-regulating auxiliary line which is connected with the outlet pipeline of the lower heat exchange coil, mixed gas of process natural gas and medium-pressure steam enters the mixed gas temperature-regulating auxiliary line, and a mixed gas temperature-regulating valve is arranged on the mixed gas temperature-regulating auxiliary line. And adjusting the temperature of the mixed gas entering the pre-converter.
Has the advantages that: the utility model discloses an increase in current conversion system in advance reborner, heater and medium pressure steam boiler, carry on earlier with the conversion to the gas mixture, reduce the production load of follow-up reborner, guarantee that the conversion is thorough, satisfy the demand that synthetic ammonia expands the ability.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
example 1, as shown in fig. 1, a synthetic ammonia reforming system for improving productivity is composed of a natural gas reformer 1, a heat-exchange reformer 2, a secondary furnace 3, a desulfurization tank a4, a desulfurization tank B5, a zinc oxide tank 6, a medium-pressure steam pipeline 7, a pre-reformer 8, a heater 9, a start-up boiler 10, a valve 11, a mixed gas temperature-regulating valve 12, a medium-pressure steam control valve 13, and various connecting pipes.
An upper heat exchange coil, a middle heat exchange coil and a lower heat exchange coil are sequentially arranged in the natural gas reformer 1 from top to bottom, an outlet of a process natural gas pipeline connected with an outlet of the compressor is connected with an inlet of the upper heat exchange coil, the process natural gas pipeline is divided into a temperature adjusting pipeline, and a valve 11 is arranged on the temperature adjusting pipeline. The natural gas of the temperature adjusting pipeline 11 and the natural gas coming out of the upper heat exchange coil are mixed and then enter the middle heat exchange coil. The import of desulfurization groove A and desulfurization groove B all links to each other with the middle part heat exchange coil export of natural gas heating furnace 1, and the export of two desulfurization grooves all links to each other with 6 imports of zinc oxide groove, all is provided with the valve on the exit line of two desulfurization grooves. The two desulfurization tanks are opened and closed or simultaneously run in parallel according to the condition.
An intermediate pressure steam pipeline 7 is connected to an outlet pipeline of the zinc oxide tank 6, and an intermediate pressure steam control valve 13 is arranged on the intermediate pressure steam pipeline 7. The natural gas from the middle heat exchange coil sequentially enters a desulfurization tank and a zinc oxide tank 6 for desulfurization, the desulfurized natural gas and medium-pressure steam are mixed and then enter the lower heat exchange coil for continuous heating, a mixed gas temperature-adjusting secondary line is divided from an outlet pipeline of the zinc oxide tank 6 and is connected with an outlet pipeline of the lower heat exchange coil, mixed gas of process natural gas and medium-pressure steam enters the mixed gas temperature-adjusting secondary line, namely the mixed gas temperature-adjusting secondary line is positioned behind the medium-pressure steam pipeline 7, and a mixed gas temperature-adjusting valve 12 is arranged on the mixed gas temperature-adjusting secondary line.
The natural gas from the outlet pipeline of the lower heat exchange coil enters from the top of the pre-converter 8, the pre-converter 8 is filled with a conversion catalyst, the bottom converted gas outlet of the pre-converter 8 is connected with the cold side inlet of the heater 9, the hot side inlet of the heater 9 is connected with the tail gas discharge pipeline of the start-up boiler 10 producing medium-pressure steam, the hot side outlet of the heater 9 is connected with the inlet of the conversion pipe of the heat exchange converter 2, the outlet of the conversion pipe of the heat exchange converter 2 is connected with the upper gas inlet of the secondary furnace 3, the bottom gas outlet of the secondary furnace 3 is connected with the shell side inlet of the heat exchange converter 2, and the start-up boiler 10 produces medium-pressure steam to the medium-pressure steam pipe network.
The present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A synthetic ammonia conversion system for improving productivity comprises a natural gas converter, a heat exchange type converter, a secondary furnace, a desulfurization tank and a zinc oxide tank, wherein an upper heat exchange coil, a middle heat exchange coil and a lower heat exchange coil are sequentially arranged in the natural gas converter from top to bottom, an outlet of a process natural gas pipeline connected with an outlet of a compressor is connected with an inlet of the upper heat exchange coil, the process natural gas pipeline is divided into a temperature adjusting pipeline, natural gas of the temperature adjusting pipeline and natural gas coming out of the upper heat exchange coil are mixed and adjusted in temperature and then enter the middle heat exchange coil, the natural gas coming out of the middle heat exchange coil sequentially enters the desulfurization tank and the zinc oxide tank for desulfurization, and the desulfurized natural gas and medium-pressure steam are mixed and then enter the lower heat exchange coil for continuous heating, and the synthetic ammonia conversion system is: the natural gas from the outlet pipeline of the lower heat exchange coil enters from the top of a pre-reformer, a reforming catalyst is filled in the pre-reformer, a bottom reformed gas outlet of the pre-reformer is connected with a cold side inlet of a heater, a hot side inlet of the heater is connected with a tail gas discharge pipeline of a start-up boiler producing medium-pressure steam, a hot side outlet of the heater is connected with a reformer inlet of a heat exchange reformer, a reformer outlet of the heat exchange reformer is connected with an upper gas inlet of a secondary boiler, a bottom gas outlet of the secondary boiler is connected with a shell side inlet of the heat exchange reformer, and the medium-pressure steam produced by the start-up boiler goes to a medium-pressure steam pipe network.
2. The system for converting synthetic ammonia with increased capacity according to claim 1, wherein: the desulfurization tank is two, is desulfurization tank A and desulfurization tank B respectively, and the import of two desulfurization tanks all links to each other with the middle part heat exchange coil export of natural gas heating furnace, and the export of two desulfurization tanks all links to each other with zinc oxide tank import.
3. The enhanced-capacity synthetic ammonia conversion system of claim 2, wherein: and a valve is arranged on the temperature adjusting pipeline.
4. The system for converting synthetic ammonia with improved energy production according to any one of claims 1 to 3, wherein: the outlet pipeline of the zinc oxide tank is connected with a medium-pressure steam pipeline, the outlet pipeline of the zinc oxide tank is divided into a mixed gas temperature-regulating auxiliary line which is connected with the outlet pipeline of the lower heat exchange coil, mixed gas of process natural gas and medium-pressure steam enters the mixed gas temperature-regulating auxiliary line, and a mixed gas temperature-regulating valve is arranged on the mixed gas temperature-regulating auxiliary line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921576676.XU CN210559363U (en) | 2019-09-20 | 2019-09-20 | Synthetic ammonia conversion system capable of improving productivity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921576676.XU CN210559363U (en) | 2019-09-20 | 2019-09-20 | Synthetic ammonia conversion system capable of improving productivity |
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| CN210559363U true CN210559363U (en) | 2020-05-19 |
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