CN211644593U - Based on CO before burning2Isothermal conversion system of trapping system - Google Patents
Based on CO before burning2Isothermal conversion system of trapping system Download PDFInfo
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- CN211644593U CN211644593U CN202020113806.2U CN202020113806U CN211644593U CN 211644593 U CN211644593 U CN 211644593U CN 202020113806 U CN202020113806 U CN 202020113806U CN 211644593 U CN211644593 U CN 211644593U
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Abstract
The utility model discloses a based on CO before burning2The isothermal transformation system of the trapping system comprises a synthesis gas input pipeline, a synthesis gas water distributor, a buffer filter, a synthesis gas preheater, an electric heater, a humidifier, an isothermal transformation furnace, a steam generator, a desalted water preheater, a transformed gas cooler, a transformed gas water distributor, a stripping tower and a desalted water buffer tank, can effectively solve various problems caused by adiabatic transformation, and is low in energy consumption and investment cost, simple in system, and free of catalysis and transformationThe phenomenon of temperature runaway of the agent bed.
Description
Technical Field
The utility model relates to an isothermal transformation system, concretely relates to based on CO before burning2An isothermal conversion system of the trap system.
Background
In recent years, the amount of carbon dioxide emitted into the atmosphere has increased greatly by the large exploitation and use of fossil energy such as coal and oil. For reducing CO2The emission of the energy resource is to replace the energy resource with high carbon emission by the energy resource with low carbon emission, and is an important strategic idea for building a non-carbon energy resource system in China. Therefore, the technology of clean and efficient utilization of energy is developed to improve energy efficiency, and CO is carried out2Capture and sequestration of, and reduction or stabilization of atmospheric CO2The concentration level is of particular significance for relieving global warming.
CO before combustion2The trapping technology is a novel technology for performing transformation trapping before the combustion of the synthesis gas, and is subsequently used as an important route of technologies such as hydrogen production, sealing storage, coal chemical product production and the like. At present, the domestic first set catches CO before combustion2The trapping system is based on carbon trapping before combustion of IGCC, and adopts processes of sulfur-tolerant shift, MDEA decarburization, wet desulphurization and the like. The transformation system is adiabatic transformation, and because the content of CO in the synthesis gas from the IGCC is high, three-stage transformation is adopted, the system is complex, and the investment and the energy consumption are high. The temperature runaway phenomenon of the catalyst bed layer occurs in the operation process, and the process index is difficult to control.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a pre-combustion CO-based fuel2The isothermal conversion system of the trapping system can effectively solve various problems caused by adiabatic conversion, has low energy consumption and investment cost, is simple, and does not generate the phenomenon of temperature runaway of a catalyst bed.
To achieve the above object, the present invention provides a pre-combustion CO-based fuel2The isothermal conversion system of the trapping system comprises a synthesis gas input pipeline, a synthesis gas water separator, a buffer filter, a synthesis gas preheater, an electric heater, a humidifier, an isothermal conversion furnace, a steam generator, a desalted water preheater, a converted gas cooler, a converted gas water separator, a stripping tower and a desalted water buffer tank;
the synthesis gas input pipeline is communicated with an inlet of the synthesis gas water separator, an air outlet of the synthesis gas water separator is communicated with an inlet of the humidifier through a buffer filter, a heat absorption side of the synthesis gas preheater and the electric heater in sequence, an outlet of a heat absorption side of the steam generator is communicated with an inlet of the humidifier, an outlet of the humidifier is communicated with a synthesis gas inlet of the isothermal shift converter, a shift gas outlet of the isothermal shift converter is communicated with an inlet of the shift gas water separator through a heat release side of the synthesis gas preheater, a heat release side of the desalted water preheater and the shift gas cooler in sequence, and a shift gas outlet of the shift gas water separator is communicated with a subsequent CO2The collecting and absorbing system is communicated, the water outlet of the shift gas water separator, the water outlet of the synthesis gas water separator and the outlet of the low-pressure steam pipeline are communicated with the inlet of the stripping tower, the outlet of the stripping tower is communicated with the inlet of the desalted water buffer tank, the outlet of the desalted water buffer tank is communicated with the heat absorption side inlet of the steam generator through the heat absorption side of the desalted water preheater, the heat release side outlet of the steam generator is communicated with the cold working medium inlet of the isothermal converter, and the cold working medium outlet of the isothermal converter is communicated with the heat release side inlet of the steam generator.
The outlet of the desalted water buffer tank is communicated with the heat absorption side inlet of the desalted water preheater through a desalted water pump.
The heat release side outlet of the steam generator is communicated with the cold working medium inlet of the isothermal shift converter through a circulating water pump.
The buffer filter is filled with an antitoxic protective agent.
The synthesis gas preheater is a shell-and-tube heat exchanger.
And a temperature adjusting auxiliary line is arranged between the heat absorption side inlet and the heat absorption side outlet of the synthesis gas preheater.
A depth-adjusting subline is arranged between the heat-absorbing side inlet and the heat-releasing side outlet of the synthesis gas preheater.
And the synthetic gas outlet of the isothermal shift converter is communicated with an emptying secondary line.
The utility model discloses following beneficial effect has:
based on CO before burning2When the isothermal conversion system of the trapping system is specifically operated, firstly, the synthesis gas is subjected to moisture drying and filtering through the synthesis gas water separator and the buffer filter to filter out impurities such as heavy metals and oxygen-containing substances which can cause the poisoning failure of a conversion catalyst in the synthesis gas, then the synthesis gas enters the isothermal conversion furnace, the synthesis gas is subjected to conversion treatment through the isothermal conversion furnace, in the conversion reaction process, reaction heat is transferred to the steam generator through circulating water through the circulating water pump and is absorbed by desalted water of a cold medium, the desalted water is vaporized into steam, the phenomenon of temperature runaway of a catalyst bed is avoided, various problems caused by adiabatic conversion are effectively solved, then the conversion gas output by the isothermal conversion furnace is subjected to three-level temperature reduction, and then the conversion gas is subjected to water separation drying through the conversion gas water separator and then enters subsequent CO2In the trapping and absorbing system, the system is simpler, and the energy consumption and the investment cost are lower.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a synthesis gas water separator, 2 is a buffer filter, 3 is a synthesis gas preheater, 4 is an electric heater, 5 is a humidifier, 6 is an isothermal shift converter, 7 is a circulating water pump, 8 is a steam generator, 9 is a desalted water preheater, 10 is a shifted gas cooler, 11 is a shifted gas water separator, 12 is a stripping tower, 13 is a desalted water buffer tank, and 14 is a desalted water pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the invention is based on pre-combustion CO2The isothermal transformation system of the trapping system comprises a synthesis gas input pipeline, a synthesis gas water separator 1, a buffer filter 2, a synthesis gas preheater 3, an electric heater 4, a humidifier 5, an isothermal transformation furnace 6 and a steam generator8. A desalted water preheater 9, a shift gas cooler 10, a shift gas water separator 11, a stripping tower 12 and a desalted water buffer tank 13; the synthesis gas input pipeline is communicated with the inlet of the synthesis gas water separator 1, the gas outlet of the synthesis gas water separator 1 is communicated with the inlet of the humidifier 5 through the buffer filter 2, the heat absorption side of the synthesis gas preheater 3 and the electric heater 4 in sequence, the heat absorption side outlet of the steam generator 8 is communicated with the inlet of the humidifier 5, the outlet of the humidifier 5 is communicated with the synthesis gas inlet of the isothermal shift furnace 6, the shift gas outlet of the isothermal shift furnace 6 is communicated with the inlet of the shift gas water separator 11 through the heat release side of the synthesis gas preheater 3, the heat release side of the desalted water preheater 9 and the shift gas cooler 10 in sequence, and the shift gas outlet of the shift gas water separator 11 is communicated with the subsequent CO2The collecting and absorbing system is communicated, the water outlet of the shift gas water separator 11, the water outlet of the synthesis gas water separator 1 and the outlet of the low-pressure steam pipeline are communicated with the inlet of the stripping tower 12, the outlet of the stripping tower 12 is communicated with the inlet of the desalted water buffer tank 13, the outlet of the desalted water buffer tank 13 is communicated with the heat absorption side inlet of the steam generator 8 through the heat absorption side of the desalted water preheater 9, the heat release side outlet of the steam generator 8 is communicated with the cold working medium inlet of the isothermal converter 6, and the cold working medium outlet of the isothermal converter 6 is communicated with the heat release side inlet of the steam generator 8.
The outlet of the desalted water buffer tank 13 is communicated with the heat absorption side inlet of the desalted water preheater 9 through a desalted water pump 14; the heat release side outlet of the steam generator 8 is communicated with the cold working medium inlet of the isothermal converter 6 through a circulating water pump 7.
A temperature-adjusting subline L1 is arranged between the heat-absorbing side inlet and the heat-absorbing side outlet of the synthesis gas preheater 3; a depth-adjusting subline L2 is arranged between the heat-absorbing side inlet and the heat-releasing side outlet of the synthesis gas preheater 3; the synthesis gas outlet of the isothermal converter 6 is communicated with a venting secondary line L3, the depth-adjusting secondary line L2 can guide part or all of the synthesis gas at the inlet of the synthesis gas preheater 3 to the shell side outlet of the synthesis gas preheater 3, and the flow of the synthesis gas entering the isothermal converter 6 is controlled by controlling the flow of the synthesis gas flowing into the depth-adjusting secondary line L2, so that the required conversion depth is achieved; the required charging temperature is achieved by controlling the flow rate of the low-temperature synthesis gas flowing into the temperature-adjusting secondary line L1.
The buffer filter 2 is filled with an anti-poison protective agent which can adsorb and filter out impurities such as heavy metals and the like in the synthesis gas, wherein the impurities can cause the shift catalyst to be poisoned and invalid.
The synthesis gas preheater 3, the steam generator 8 and the desalted water preheater 9 are shell-and-tube heat exchangers.
The utility model discloses a concrete working process does:
the synthesis gas enters a synthesis gas water separator 1 from a boundary area for water separation and drying, wherein the separated synthesis gas enters a buffer filter 2 for filtering, the filtered synthesis gas enters a synthesis gas preheater 3 to be heated by high-temperature conversion gas from an isothermal converter 6 and then enters an electric heater 4 for heating, the synthesis gas output by the electric heater 4 is mixed with medium-pressure steam output by a steam generator 8 and then enters an isothermal converter 6 for conversion reaction to generate conversion gas, the conversion gas enters the synthesis gas preheater 3 for primary heat exchange and cooling, the cooled conversion gas enters a desalted water preheater 9 for secondary heat exchange and cooling, then enters a conversion gas cooler 10 for tertiary heat exchange and cooling, is subjected to water separation and drying by a conversion gas water separator 11 and then enters subsequent CO (carbon monoxide) for water separation and drying, and the separated synthesis gas enters a buffer filter 2 for filtering2In a trapping absorption system.
The process water separated by the synthesis gas water separator 1 and the shift conversion gas water separator 11 enters a stripping tower 12 and is mixed with low-pressure steam to extract acid gas in the water, the stripped process water enters a desalted water buffer tank 13 for recycling, the process water in the desalted water buffer tank 13 is pressurized by a desalted water pump 14 and then is sent into a desalted water preheater 9 to exchange heat with the shift conversion gas output by the synthesis gas preheater 3 and then enters a steam generator 8, and then exchanges heat with boiler feed water output by the isothermal shift converter 6 to generate medium-pressure steam, wherein the generated medium-pressure steam enters a humidifier 5 and is mixed with the synthesis gas output by the electric heater 4 and then enters the isothermal shift converter 6.
In addition, at the initial stage of start-up, the electric heater 4 is operated, that is, when the temperature of the synthesis gas output from the synthesis gas preheater 3 does not reach the activation temperature of the shift catalyst, the electric heater 4 turns on the electric heating function. Once the high temperature shift gas is generated in the isothermal shift converter 6, the low temperature synthesis gas from the buffer filter 2 is heated by the synthesis gas preheater 3 to reach the activation temperature of the shift catalyst, and at this time, the electric heater 4 is turned off.
The isothermal shift converter 6 is internally provided with a plurality of heat exchange tubes, shift catalysts are filled in gaps among the heat exchange tubes, low-temperature working medium flowing in the heat exchange tubes is boiler feed water, the heat exchange tubes, a circulating water pump 7 and a steam generator 8 form a circulating loop of the boiler feed water, the boiler feed water is in undersaturation operation, and the isothermal shift converter has the function of removing heat released by shift reaction.
Claims (8)
1. Based on CO before burning2The isothermal conversion system of the capture system is characterized by comprising a synthesis gas input pipeline, a synthesis gas water separator (1), a buffer filter (2), a synthesis gas preheater (3), an electric heater (4), a humidifier (5), an isothermal conversion furnace (6), a steam generator (8), a desalted water preheater (9), a conversion gas cooler (10), a conversion gas water separator (11), a stripping tower (12) and a desalted water buffer tank (13);
the synthesis gas input pipeline is communicated with an inlet of a synthesis gas water separator (1), an air outlet of the synthesis gas water separator (1) is communicated with an inlet of a humidifier (5) through a buffer filter (2), a heat absorption side of a synthesis gas preheater (3) and an electric heater (4) in sequence, an outlet of a heat absorption side of a steam generator (8) is communicated with an inlet of the humidifier (5), an outlet of the humidifier (5) is communicated with a synthesis gas inlet of an isothermal converter (6), a conversion gas outlet of the isothermal converter (6) is communicated with an inlet of a conversion gas water separator (11) through a heat release side of the synthesis gas preheater (3), a heat release side of a desalted water preheater (9) and a conversion gas cooler (10) in sequence, and a conversion gas outlet of the conversion gas water separator (11) is communicated with a subsequent CO2The collecting and absorbing system is communicated, the water outlet of the shift gas water separator (11), the water outlet of the synthesis gas water separator (1) and the outlet of the low-pressure steam pipeline are communicated with the inlet of the stripping tower (12), the outlet of the stripping tower (12) is communicated with the inlet of the desalted water buffer tank (13), the outlet of the desalted water buffer tank (13) is communicated with the heat-absorbing side inlet of the steam generator (8) through the heat-absorbing side of the desalted water preheater (9), and the heat-releasing side outlet of the steam generator (8) is communicated with the isothermal shift conversionThe cold working medium inlet of the furnace (6) is communicated, and the cold working medium outlet of the isothermal conversion furnace (6) is communicated with the heat release side inlet of the steam generator (8).
2. The pre-combustion CO-based according to claim 12The isothermal transformation system of the capture system is characterized in that the outlet of a desalted water buffer tank (13) is communicated with the heat absorption side inlet of a desalted water preheater (9) through a desalted water pump (14).
3. The pre-combustion CO-based according to claim 12The isothermal transformation system of the capture system is characterized in that a heat release side outlet of a steam generator (8) is communicated with a cold working medium inlet of an isothermal transformation furnace (6) through a circulating water pump (7).
4. The pre-combustion CO-based according to claim 12The isothermal transformation system of the capture system is characterized in that the interior of the buffer filter (2) is filled with an antitoxic protective agent.
5. The pre-combustion CO-based according to claim 12The isothermal transformation system of the capture system is characterized in that the synthesis gas preheater (3) is a shell-and-tube heat exchanger.
6. The pre-combustion CO-based according to claim 12The isothermal shift system of the capture system is characterized in that a temperature adjustment subline (L1) is arranged between the heat absorption side inlet and the heat absorption side outlet of the synthesis gas preheater (3).
7. The pre-combustion CO-based according to claim 12Isothermal shift system for a capture system, characterized in that a depth-control subline (L2) is arranged between the heat-absorption-side inlet and the heat-release-side outlet of the syngas preheater (3).
8. The pre-combustion CO-based according to claim 12The isothermal transformation system of the capture system is characterized in that a synthesis gas outlet of the isothermal transformation furnace (6) is communicatedThere is a vent subline (L3).
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| CN202020113806.2U CN211644593U (en) | 2020-01-17 | 2020-01-17 | Based on CO before burning2Isothermal conversion system of trapping system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111115575A (en) * | 2020-01-17 | 2020-05-08 | 中国华能集团清洁能源技术研究院有限公司 | Based on CO before burning2Isothermal conversion system of trapping system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111115575A (en) * | 2020-01-17 | 2020-05-08 | 中国华能集团清洁能源技术研究院有限公司 | Based on CO before burning2Isothermal conversion system of trapping system |
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