CN115055030A - Heating furnace operation method with zero carbon dioxide emission - Google Patents
Heating furnace operation method with zero carbon dioxide emission Download PDFInfo
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- CN115055030A CN115055030A CN202210654852.7A CN202210654852A CN115055030A CN 115055030 A CN115055030 A CN 115055030A CN 202210654852 A CN202210654852 A CN 202210654852A CN 115055030 A CN115055030 A CN 115055030A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
Abstract
The invention discloses an operation method of a heating furnace with zero emission of carbon dioxide. The method comprises the following steps: preheating oxygen, mixing the preheated oxygen with circulating flue gas to obtain mixed gas, and feeding the mixed gas and preheated fuel into a heating furnace for combustion; compressing part of flue gas generated by combustion of the heating furnace to be used as circulating flue gas, and using the other part of flue gas to preheat fuel and oxygen; performing low-temperature heat exchange on the flue gas subjected to heat exchange with the fuel and the oxygen to obtain low-temperature flue gas; removing moisture from the low-temperature flue gas by a water separator to obtain dry flue gas; the dry flue gas enters an absorption tower and is in countercurrent contact with the mixed alcohol amine solution, lean gas is obtained at the top of the absorption tower, and rich liquid is obtained at the bottom of the absorption tower; the rich solution enters a desorption tower after heat exchange, and CO with the concentration of more than 99 percent is obtained through rectification and separation 2 And circulating alcohol amine solution, wherein the circulating alcohol amine solution exchanges heat with the rich solution and then enters the absorption tower. The invention adopts pure oxygen and circulating flue gas as the main air of the heating furnace, and the flue gas of the heating furnace does not contain NO x Component (a) with CO 2 The concentration is greatly improved, and the energy consumption of the subsequent carbon capture process is greatly reduced.
Description
Technical Field
The invention relates to an operation method of a heating furnace with zero emission of carbon dioxide, belonging to the technical field of petroleum processing.
Background
Since carbon dioxide concentration in the furnace is low, typically below 10%, and therefore would result in higher energy consumption if carbon capture were performed directly, higher carbon dioxide production concentration would typically mean lower carbon dioxide capture and compression costs, and thus increasing carbon dioxide concentration is an effective way to reduce the operating costs of carbon capture.
Chinese patent application CN 104121581A discloses a low-concentration oxygen-enriched combustion system and burner of a high-efficiency low NOx tubular heating furnace, the method adopts oxygen-enriched gas obtained by mixing air and oxygen-enriched air as an oxidant, and because the oxygen concentration is higher, the concentration of carbon dioxide in the flue gas of the heating furnace is greatly reduced, the generation amount of NOx in the combustion process is reduced, the power consumption of a blower and an induced draft fan is reduced, and the cost of carbon dioxide capture and separation is reduced. However, the flue gas still contains more than 50% of nitrogen, and the carbon capture energy consumption is still higher.
The Chinese patent application CN 205065703U discloses a low-NOx flue gas circulation oxygen-enriched combustion device for a heating furnace, and the method continuously circulates flue gas, gradually reduces the nitrogen content in the heating furnace, simultaneously reduces the generation amount of NOx in the combustion process, and improves the utilization rate of fuel. However, in the operation process of the method, a small amount of nitrogen still exists, and meanwhile, the heat in the flue gas is not fully utilized, so that the energy utilization rate is low.
Disclosure of Invention
The invention aims to provide a heating furnace operation method with zero carbon dioxide emission on the basis of the existing heating furnace flue gas treatment process so as to reduce carbon emission from the source.
The method for operating the heating furnace with zero emission of carbon dioxide provided by the invention comprises the following steps:
s1, preheating oxygen, mixing the preheated oxygen with circulating flue gas to obtain mixed gas, and feeding the mixed gas and preheated fuel into a heating furnace for combustion;
s2, compressing part of smoke generated by combustion of the heating furnace to be used as the circulating smoke, and using the other part of smoke to preheat the fuel and the oxygen;
s3, performing low-temperature heat exchange on the flue gas subjected to heat exchange with the fuel and the oxygen to obtain low-temperature flue gas, and heating domestic water;
s4, removing moisture from the low-temperature flue gas through a water separator to obtain dry flue gas;
s5, enabling the dry flue gas to enter an absorption tower and to be in countercurrent contact with a mixed alcohol amine solution so as to absorb and enrich carbon dioxide in the dry flue gas, wherein lean gas is obtained at the top of the absorption tower, and rich liquid is obtained at the bottom of the absorption tower;
and S6, the rich solution enters a desorption tower after heat exchange, carbon dioxide with the concentration of more than 99% and a circulating alcohol amine solution are obtained through rectification and separation, and the circulating alcohol amine solution enters the absorption tower after heat exchange with the rich solution.
In the above method, in step S1, the volume fraction of oxygen in the mixed gas is 21 to 50%.
In the above method, in step S1, a heat collector is provided in the heating furnace;
the temperature of the outlet flue gas of the heating furnace is 130-180 ℃.
In the method, in step S1, the temperature of the preheated fuel is 120-150 ℃;
the temperature of the preheated oxygen is 90-110 ℃.
In the method, in the step S3, the temperature of the low-temperature flue gas is 40 to 60 ℃.
In the above method, in step S4, the water separator is a low-temperature gas-liquid separation device, a solid adsorption water removal device, or a combination device of a low-temperature heat exchanger and a gas-liquid separation tank.
Compared with the prior heating furnace process, the invention has the following beneficial technical effects:
1. the heat of the flue gas of the heating furnace is fully utilized, so that the energy loss is reduced;
2. pure oxygen and circulating flue gas are used as main air of the heating furnace, and the flue gas of the heating furnace does not contain NO x The components and the concentration of carbon dioxide are greatly improved, and the energy consumption of the subsequent carbon capture process is greatly reduced;
3. after the process of over-absorption and desorption, high-concentration carbon dioxide gas with the concentration of more than 99 percent is obtained and can be used for sequestration or oil displacement operation.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
FIG. 1 shows a flow chart of the present invention.
Firstly, preheating a fuel 1 by a fuel preheater 3 to obtain a heated fuel 5, preheating pure oxygen 2 by a pure oxygen preheater 4 to obtain heated pure oxygen 6, and mixing the heated pure oxygen 6 with circulating flue gas 13 to obtain a mixed gas 7. The mixed gas 7 and the heated fuel 5 enter a heating furnace 8 to be combusted at the same time, a heating device is arranged in the heating furnace, the flue gas 9 exhausted by the heating furnace is divided into two parts, one part enters a flue gas circulating compressor 12 to be pressurized and then is mixed with heated pure oxygen 6 and returns to the heating furnace 8, the other part of flue gas 11 enters a fuel preheater 3, the flue gas 114 exhausted by the fuel preheater 3 enters a pure oxygen preheater 4, and the flue gas 215 exhausted by the pure oxygen preheater 4 enters a low-temperature heat exchanger 16. Domestic water 17 is heated into high-temperature water 18 in the low-temperature heat exchanger 16, low-temperature flue gas 19 discharged from the low-temperature heat exchanger 16 enters a water separator 20 to separate water, obtained sewage 21 is sent to sewage treatment, and dry flue gas 22 discharged from the water separator 20 enters an absorption tower 23. The dry flue gas 22 and the mixed alcohol amine solution 28 are subjected to an absorption process in the absorption tower 23, lean gas 25 discharged from the top of the absorption tower 23 is sent to a chimney, and rich liquid 24 discharged from the bottom of the absorption tower 23 is heated by a feeding heat exchanger 27 and then enters a desorption tower 29. The circulating alcohol amine solution 26 discharged from the bottom of the desorption tower 29 exchanges heat through a feeding heat exchanger 27 and then is mixed with a fresh alcohol amine solution 30 to obtain a mixed alcohol amine solution 28, and high-concentration carbon dioxide 31 is discharged from the top of the desorption tower 29 and used for sealing or oil displacement treatment.
Examples 1,
In order to verify the effect of the method, according to the process flow chart shown in FIG. 1, the energy consumption and the product are simulated and calculated by using flow simulation software, and the fuel consumption is 2600 kg/h. The composition of the fuel 1, the mixed gas 7 and the flue gas 9 is listed in table 1, and the heating power of the heating furnace and part of the energy consumption of the equipment are summarized in table 2. The volume fraction of oxygen in the mixed gas is 21%, the outlet temperature of the heating furnace is 180 ℃, the outlet temperature of the flue gas of the fuel preheater is 135 ℃, the outlet temperature of the flue gas of the pure oxygen preheater is 104 ℃, the outlet temperature of the flue gas of the low-temperature heat exchanger is 50 ℃, the temperature of the water separator is 10 ℃, and the concentration of the obtained high-concentration carbon dioxide is 99.9%.
Comparative examples 1,
The comparative example adopts the process flow of a conventional heating furnace, and the fuel consumption is 2600 kg/h. The combustion improver is air, the volume fraction of oxygen is 21%, the composition of fuel and flue gas is listed in table 1, the thermal power of the heating furnace and the energy consumption of part of equipment are summarized in table 2, and the concentration of the finally obtained high-concentration carbon dioxide is 99%.
As can be seen from tables 1 and 2, compared with the comparative example, the operation method of the carbon dioxide zero-emission heating furnace provided by the invention can fully utilize the heat of the flue gas, the thermal power of the heating furnace is improved by 7%, hot water is produced as a byproduct, the concentration of the carbon dioxide in the flue gas is greatly improved, the energy consumption for capturing the carbon dioxide is greatly reduced, and the economic benefit is obvious.
TABLE 1 composition of the gases
TABLE 2 energy consumption for the respective treatment modes
| Item, unit | Examples | Comparative example |
| Heating furnace thermal power, Gcal/h | 31.1 | 28.9 |
| High temperature water yield of low temperature heat exchanger, t/h | 65 | 0 |
| Flue gas recirculation compressor power, Gcal/h | 0.16 | 0 |
| Carbon dioxide Capture energy consumption, Gcal/h | 1.3 | 5.1 |
Claims (6)
1. A method for operating a heating furnace with zero emission of carbon dioxide comprises the following steps:
s1, preheating oxygen, mixing the preheated oxygen with circulating flue gas to obtain mixed gas, and feeding the mixed gas and preheated fuel into a heating furnace for combustion;
s2, compressing part of smoke generated by combustion of the heating furnace to be used as the circulating smoke, and using the other part of smoke to preheat the fuel and the oxygen;
s3, carrying out low-temperature heat exchange on the flue gas subjected to heat exchange with the fuel and the oxygen to obtain low-temperature flue gas;
s4, removing moisture from the low-temperature flue gas through a water separator to obtain dry flue gas;
s5, enabling the dry flue gas to enter an absorption tower and to be in countercurrent contact with a mixed alcohol amine solution so as to absorb and enrich carbon dioxide in the dry flue gas, wherein lean gas is obtained at the top of the absorption tower, and rich liquid is obtained at the bottom of the absorption tower;
and S6, the rich solution enters a desorption tower after heat exchange, carbon dioxide with the concentration of more than 99% and a circulating alcohol amine solution are obtained through rectification and separation, and the circulating alcohol amine solution enters the absorption tower after heat exchange with the rich solution.
2. The method of claim 1, wherein: in step S1, the volume fraction of oxygen in the mixed gas is 21-50%.
3. The method according to claim 1 or 2, characterized in that: in step S1, a heat collector is provided in the heating furnace;
the temperature of the outlet flue gas of the heating furnace is 130-180 ℃.
4. The method according to any one of claims 1-3, wherein: in the step S1, the temperature of the preheated fuel is 120-150 ℃;
the temperature of the preheated oxygen is 90-110 ℃.
5. The method according to any one of claims 1-4, wherein: in the step S3, the temperature of the low-temperature flue gas is 40-60 ℃.
6. The method according to any one of claims 1-5, wherein: in step S4, the water separator is a low-temperature gas-liquid separation device, a solid adsorption water removal device, or a combination device of a low-temperature heat exchanger and a gas-liquid separation tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210654852.7A CN115055030A (en) | 2022-06-10 | 2022-06-10 | Heating furnace operation method with zero carbon dioxide emission |
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| CN202210654852.7A CN115055030A (en) | 2022-06-10 | 2022-06-10 | Heating furnace operation method with zero carbon dioxide emission |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06322433A (en) * | 1993-05-14 | 1994-11-22 | Nippon Steel Corp | Heating furnace |
| US6202574B1 (en) * | 1999-07-09 | 2001-03-20 | Abb Alstom Power Inc. | Combustion method and apparatus for producing a carbon dioxide end product |
| CN2429780Y (en) * | 2000-02-18 | 2001-05-09 | 中原石油勘探局勘察设计研究院 | Pipe heat collector for water sleeve heating furnace in oil field |
| CN201531870U (en) * | 2009-09-15 | 2010-07-21 | 东南大学 | Device for carbon dioxide emission reduction through oxygen combustion in circulating fluidized bed based on warm flue gas recirculation |
| CN106594715A (en) * | 2016-12-05 | 2017-04-26 | 中国科学院工程热物理研究所 | Circulating fluidized bed oxygen-enriched combustion method and device with wet flue gas recycled |
| CN207247926U (en) * | 2017-09-25 | 2018-04-17 | 中国石油化工集团公司 | A kind of pure oxygen tubular heater |
| CN113877371A (en) * | 2021-11-10 | 2022-01-04 | 中国石油大学(北京) | Catalytic cracking regeneration method with zero emission of carbon dioxide |
| CN215982530U (en) * | 2021-09-30 | 2022-03-08 | 上海浩用工业炉有限公司 | Heating furnace system using low-calorific-value fuel gas |
| CN216244241U (en) * | 2021-07-19 | 2022-04-08 | 洛阳瑞昌环境工程有限公司 | Pure oxygen heating furnace |
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2022
- 2022-06-10 CN CN202210654852.7A patent/CN115055030A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06322433A (en) * | 1993-05-14 | 1994-11-22 | Nippon Steel Corp | Heating furnace |
| US6202574B1 (en) * | 1999-07-09 | 2001-03-20 | Abb Alstom Power Inc. | Combustion method and apparatus for producing a carbon dioxide end product |
| CN2429780Y (en) * | 2000-02-18 | 2001-05-09 | 中原石油勘探局勘察设计研究院 | Pipe heat collector for water sleeve heating furnace in oil field |
| CN201531870U (en) * | 2009-09-15 | 2010-07-21 | 东南大学 | Device for carbon dioxide emission reduction through oxygen combustion in circulating fluidized bed based on warm flue gas recirculation |
| CN106594715A (en) * | 2016-12-05 | 2017-04-26 | 中国科学院工程热物理研究所 | Circulating fluidized bed oxygen-enriched combustion method and device with wet flue gas recycled |
| CN207247926U (en) * | 2017-09-25 | 2018-04-17 | 中国石油化工集团公司 | A kind of pure oxygen tubular heater |
| CN216244241U (en) * | 2021-07-19 | 2022-04-08 | 洛阳瑞昌环境工程有限公司 | Pure oxygen heating furnace |
| CN215982530U (en) * | 2021-09-30 | 2022-03-08 | 上海浩用工业炉有限公司 | Heating furnace system using low-calorific-value fuel gas |
| CN113877371A (en) * | 2021-11-10 | 2022-01-04 | 中国石油大学(北京) | Catalytic cracking regeneration method with zero emission of carbon dioxide |
Non-Patent Citations (1)
| Title |
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| 夏璐;王恩禄;汪丽芬;宋治璐;: "富氧燃烧烟气循环过程建模及燃烧产物体积变化特性研究" * |
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