Carbon dioxide delivery system

Abstract

The invention relates to a carbon dioxide conveying system. An inlet of a compressor communicates with a carbon dioxide collecting pipeline, an outlet of the compressor communicates with an inlet of a first heat exchanger, an outlet of the first heat exchanger communicates with an inlet of an absorption tower, and a bottom outlet of the absorption tower communicates with an inlet of a first separation tank; an inlet of the second feeding pump is communicated with a bottom outlet of the first separation tank, an outlet of the second feeding pump is communicated with an inlet of the second heat exchanger, an outlet of the second heat exchanger is communicated with an inlet of the stripping tower, a bottom outlet of the stripping tower is communicated with an inlet of the second separation tank, and a top outlet of the stripping tower is communicated with the purification unit; a bottom outlet of the second separation tank is communicated with an inlet of the first feeding pump; an outlet of the first feeding pump is communicated with an inlet of the first heat exchanger. Carbon dioxide is in a stable storage state through the absorption tower and the stripping tower and is easy to transport, the generated carbon dioxide is easy to separate from the system, the safety coefficient is high, and the investment cost is low.

Description

Technical Field

[0001] The present disclosure relates to the technical field of carbon dioxide delivery, and in particular, to a carbon dioxide delivery system. Background Art

[0002] In recent years, global environmental problems centered on climate change have become increasingly serious, and the control and reduction of greenhouse gas emissions have become a hot topic of concern to the international community. CO2 capture, utilization and storage (CCUS) technology will play an important role in the transition to a low-carbon economy. The use of pipelines to transport CO2 is an important part of achieving CCUS. Its mainstream distribution model is that upstream factories recover (or capture) CO2 and then transport it to downstream oil and gas fields to increase recovery rates, or directly bury it.

[0003] The critical pressure of CO2 is 7.38MPa, the temperature is 31.1℃, and the critical density is 0.448g / cm3. It is currently considered to be a more convenient and economical means of transportation to heat and pressurize the captured CO2 to a supercritical state and then transport it to target locations such as oil and gas fields or underground voids through pipelines. Supercritical CO2 has the characteristics of high compressibility, high diffusivity and low viscosity, and its solubility in water is much higher than that of non-supercritical CO2.

[0004] According to statistics from the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA), there were 64 CO2 pipeline leakage accidents in the United States between 1992 and 2013, and pipeline corrosion failure (accounting for 23.6%) and material, welding or equipment failure (accounting for 24.1%) were the main causes of these accidents.

[0005] When the supercritical CO2 transmission pipeline contains water and other impurities, metal components such as pipelines and equipment will be severely corroded. In some special cases, the corrosion rate can even reach 10mm / a, which has reached the level of severe corrosion. When the water content exceeds its solubility in supercritical CO2 and precipitates and condenses into a liquid phase, it combines with CO2 to form carbonic acid, which poses a major threat to metals. When the pH value is the same, the corrosion ability of carbonic acid on metals is much higher than that of hydrochloric acid and sulfuric acid.

[0006] Although CO2 is non-flammable, its density is greater than that of air, and it has certain asphyxiation and inhalation problems. Due to the high operating pressure of the pipeline, high crack prevention requirements, and great impact on ground personnel after leakage, its pipeline safety and operation risk control should be increasingly valued.

[0007] How to effectively reduce the CO2 delivery pressure and reduce the risk of leakage during the delivery process is a key issue that needs to be solved urgently. Summary of the invention

[0008] The purpose of the present disclosure is to provide a carbon dioxide delivery system, which can effectively solve the technical problems existing in the related art.

[0009] In order to achieve the above-mentioned object, the present disclosure provides a carbon dioxide delivery system, the carbon dioxide delivery system comprising a first delivery unit and a second delivery unit;

[0010] The first delivery unit includes a compressor, a first feed pump, a first heat exchanger, an absorption tower and a first separation tank, wherein the inlet of the compressor is used to communicate with the carbon dioxide collection pipeline, the outlet of the compressor is communicated with the inlet of the first heat exchanger, the outlet of the first heat exchanger is communicated with the inlet of the absorption tower, and the bottom outlet of the absorption tower is communicated with the inlet of the first separation tank;

[0011] The second conveying unit includes a second feed pump, a second heat exchanger, a stripping tower, a second separation tank and a purification unit, the inlet of the second feed pump is connected to the bottom outlet of the first separation tank, the outlet of the second feed pump is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the inlet of the stripping tower, the bottom outlet of the stripping tower is connected to the inlet of the second separation tank, the top outlet of the stripping tower is connected to the purification unit, the bottom outlet of the second separation tank is connected to the inlet of the first feed pump, and the outlet of the first feed pump is connected to the inlet of the first heat exchanger.

[0012] Optionally, the carbon dioxide delivery system further includes a first delivery pipeline and a second delivery pipeline;

[0013] One end of the first delivery pipeline is in communication with the bottom outlet of the first separation tank, and the other end of the first delivery pipeline is in communication with the inlet of the second feed pump, so as to deliver the carbon-rich solution flowing out of the bottom outlet of the first separation tank;

[0014] One end of the second delivery pipeline is connected to the bottom outlet of the second separation tank, and the other end of the second delivery pipeline is connected to the inlet of the first feed pump, so as to deliver the carbon-depleted solution flowing out from the bottom outlet of the second separation tank.

[0015] Optionally, the carbon dioxide delivery system further includes a first valve and a second valve, wherein the first valve is disposed on the first delivery pipeline, and the second valve is disposed on the second delivery pipeline.

[0016] Optionally, the carbon dioxide delivery system also includes a first gas-phase discharge pipeline, a second gas-phase discharge pipeline and a third gas-phase discharge pipeline, the first gas-phase discharge pipeline is connected to the top outlet of the absorption tower, the second gas-phase discharge pipeline is connected to the top outlet of the first separation tank, and the third gas-phase discharge pipeline is connected to the top outlet of the second separation tank.

[0017] Optionally, the carbon dioxide delivery system further includes a third valve, a fourth valve and a fifth valve, the third valve being arranged on the first gas phase discharge pipeline, the fourth valve being arranged on the second gas phase discharge pipeline, and the fifth valve being arranged on the third gas phase discharge pipeline.

[0018] Optionally, the carbon dioxide delivery system also includes a third delivery pipeline and a fourth delivery pipeline, one end of the third delivery pipeline is connected to the outlet of the compressor, the other end of the third delivery pipeline is connected to the inlet of the first heat exchanger, one end of the fourth delivery pipeline is connected to the outlet of the first feed pump, and the other end of the fourth delivery pipeline is connected to the third delivery pipeline.

[0019] Optionally, the carbon dioxide delivery system further includes a sixth valve and a seventh valve, the sixth valve being arranged on the third delivery pipeline, and the seventh valve being arranged on the fourth delivery pipeline.

[0020] Optionally, the purification unit comprises a condenser and a carbon dioxide purification unit, the inlet of the condenser is communicated with the top outlet of the stripping tower, and the outlet of the condenser is communicated with the inlet of the carbon dioxide purification unit.

[0021] Optionally, the inner surface of the first conveying pipeline is provided with a first anti-corrosion layer, and the inner surface of the second conveying pipeline is provided with a second anti-corrosion layer.

[0022] Optionally, the carbon dioxide delivery system further includes a first pressure detection component and a second pressure detection component, wherein the first pressure detection component is disposed on the first delivery pipeline, and the second pressure detection component is disposed on the second delivery pipeline.

[0023] In the above technical scheme, the compressor feeds the collected carbon dioxide into the absorption tower, the first feed pump feeds the carbon-poor solvent into the absorption tower, and after separation in the first separation tank, a carbon-rich solvent is obtained, and the carbon-rich solvent is transported to the second delivery unit, and after delivery by the second feed pump, it is sent to the stripping tower, and the reaction product is separated to obtain mixed carbon dioxide and carbon-poor solvent, and the mixed carbon dioxide is purified by the purification unit to obtain purified carbon dioxide, and the carbon-poor solvent is transported back to the first feed pump of the first delivery unit. The carbon dioxide transportation system realizes the recycling of carbon-carrying solvents, and the carbon dioxide is kept in a stable state through the absorption tower and the stripping tower, which is easy to transport, and the generated carbon dioxide is easy to separate from the system. Compared with carbon dioxide transportation methods such as tank truck transportation, ship transportation, and supercritical pipeline transportation, it has a high safety factor and low investment cost, and is suitable for using the captured carbon dioxide in oil recovery and other fields.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0026] Figure 1 is a schematic diagram of a carbon dioxide delivery system according to an embodiment of the present disclosure.

[0027] Description of Reference Numerals

[0028] 1 First delivery unit 11 Compressor

[0029] 12 First feed pump 13 First heat exchanger

[0030] 14 Absorption tower 15 First separation tank

[0031] 2 Second conveying unit 21 Second feed pump

[0032] 22 Second heat exchanger 23 Stripping tower

[0033] 24 Second separation tank 25 Purification unit

[0034] 251 Condenser 252 Carbon dioxide purification unit

[0035] 10 First delivery pipeline 20 Second delivery pipeline

[0036] 30 third delivery pipeline 40 fourth delivery pipeline

[0037] 101 First gas phase discharge pipeline 102 Second gas phase discharge pipeline

[0038] 103 The third gas phase discharge pipeline DETAILED DESCRIPTION

[0039] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0040] Reference Figure 1 As shown, the present disclosure provides a carbon dioxide delivery system, which includes a first delivery unit 1 and a second delivery unit 2. The first delivery unit 1 includes a compressor 11, a first feed pump 12, a first heat exchanger 13, an absorption tower 14 and a first separation tank 15, the inlet of the compressor 11 is used to communicate with a carbon dioxide collection pipeline, the outlet of the compressor 11 is communicated with the inlet of the first heat exchanger 13, the outlet of the first heat exchanger 13 is communicated with the inlet of the absorption tower 14, and the bottom outlet of the absorption tower 14 is communicated with the inlet of the first separation tank 15. The second conveying unit 2 includes a second feed pump 21, a second heat exchanger 22, a stripping tower 23, a second separation tank 24 and a purification unit 25. The inlet of the second feed pump 21 is connected to the bottom outlet of the first separation tank 15, the outlet of the second feed pump 21 is connected to the inlet of the second heat exchanger 22, the outlet of the second heat exchanger 22 is connected to the inlet of the stripping tower 23, the bottom outlet of the stripping tower 23 is connected to the inlet of the second separation tank 24, the top outlet of the stripping tower 23 is connected to the purification unit 25, the bottom outlet of the second separation tank 24 is connected to the inlet of the first feed pump 12, and the outlet of the first feed pump 12 is connected to the inlet of the first heat exchanger 13.

[0041] In the above technical scheme, the compressor 11 feeds the collected carbon dioxide into the absorption tower 14, and the first feed pump 12 feeds the carbon-poor solvent into the absorption tower 14. After separation in the first separation tank 15, a carbon-rich solvent is obtained, and the carbon-rich solvent is transported to the second conveying unit 2, and is transported to the stripping tower 23 after being transported by the second feed pump 21. The reaction product is separated to obtain mixed carbon dioxide and carbon-poor solvent. The mixed carbon dioxide is purified by the purification unit 25 to obtain purified carbon dioxide, and the carbon-poor solvent is transported back to the first feed pump 12 of the first conveying unit 1. The carbon dioxide transportation system realizes the recycling of carbon-carrying solvents, and the carbon dioxide is kept in a stable state through the absorption tower 14 and the stripping tower 23, which is easy to transport, and the generated carbon dioxide is easy to separate from the system. Compared with carbon dioxide transportation methods such as tank truck transportation, ship transportation, and supercritical pipeline transportation, it has a high safety factor and low investment cost, and is suitable for using the captured carbon dioxide in oil recovery and other fields.

[0042] In one embodiment, referring to Figure 1 As shown, the carbon dioxide delivery system further includes a first delivery pipeline 10 and a second delivery pipeline 20; one end of the first delivery pipeline 10 is connected to the bottom outlet of the first separation tank 15, and the other end of the first delivery pipeline 10 is connected to the inlet of the second feed pump 21, so as to deliver the carbon-rich solution flowing out of the bottom outlet of the first separation tank 15. One end of the second delivery pipeline 20 is connected to the bottom outlet of the second separation tank 24, and the other end of the second delivery pipeline 20 is connected to the inlet of the first feed pump 12, so as to deliver the carbon-depleted solution flowing out of the bottom outlet of the second separation tank 24.

[0043] In this embodiment, by providing the first delivery pipeline 10, it is convenient to deliver the carbon-rich solution flowing out of the bottom outlet of the first separation tank 15 to the second feed pump 21, and the delivery is convenient. The length, radial size, material, etc. of the first delivery pipeline 10 can be set according to the needs, and the present disclosure does not limit this. By providing the second delivery pipeline 20, it is convenient to deliver the carbon-depleted solution flowing out of the bottom outlet of the second separation tank 24 to the first feed pump 12, and the delivery is convenient. The length, radial size, material, etc. of the second delivery pipeline 20 can be set according to the needs, and the present disclosure does not limit this.

[0044] Optionally, a first anti-corrosion layer is provided on the inner surface of the first delivery pipeline 10 , and a second anti-corrosion layer is provided on the inner surface of the second delivery pipeline 20 , so as to reduce corrosion of the first delivery pipeline 10 and the second delivery pipeline 20 and extend the service life of the first delivery pipeline 10 and the second delivery pipeline 20 .

[0045] Optionally, the carbon dioxide delivery system further includes a first valve (not shown) and a second valve (not shown), the first valve being arranged on the first delivery pipeline 10, and the second valve being arranged on the second delivery pipeline 20. By arranging the first valve and the second valve, the first delivery pipeline 10 and the second delivery pipeline 20 can be opened and closed, which is convenient for operators to operate.

[0046] Reference Figure 1 As shown, the carbon dioxide delivery system also includes a first gas-phase discharge pipeline 101, a second gas-phase discharge pipeline 102 and a third gas-phase discharge pipeline 103. The first gas-phase discharge pipeline 101 is connected to the top outlet of the absorption tower 14, the second gas-phase discharge pipeline 102 is connected to the top outlet of the first separation tank 15, and the third gas-phase discharge pipeline 103 is connected to the top outlet of the second separation tank 24.

[0047] In this embodiment, by providing the first gas-phase discharge pipeline 101, the gas flowing out of the top outlet of the absorption tower 14 can be effectively utilized, by providing the second gas-phase discharge pipeline 102, the gas flowing out of the top outlet of the first separation tank 15 can be effectively utilized, and by providing the third gas-phase discharge pipeline 103, the gas flowing out of the top outlet of the second separation tank 24 can be effectively utilized. The length, radial size, material, etc. of the first gas-phase discharge pipeline 101, the second gas-phase discharge pipeline 102, and the third gas-phase discharge pipeline 103 can be set according to the needs, and the present disclosure does not limit this.

[0048] Optionally, the carbon dioxide delivery system further includes a third valve (not shown), a fourth valve (not shown) and a fifth valve (not shown), the third valve being arranged on the first gas phase discharge pipeline 101, the fourth valve being arranged on the second gas phase discharge pipeline 102, and the fifth valve being arranged on the third gas phase discharge pipeline 103. By arranging the third valve, the fourth valve and the fifth valve, it is convenient to conduct and close the first gas phase discharge pipeline 101, the second gas phase discharge pipeline 102 and the third gas phase discharge pipeline 103, so as to facilitate the operator to perform adjustment operations.

[0049] In other embodiments, the carbon dioxide delivery system further includes a third delivery pipeline 30 and a fourth delivery pipeline 40, one end of the third delivery pipeline 30 is connected to the outlet of the compressor 11, the other end of the third delivery pipeline 30 is connected to the inlet of the first heat exchanger 13, one end of the fourth delivery pipeline 40 is connected to the outlet of the first feed pump 12, and the other end of the fourth delivery pipeline 40 is connected to the third delivery pipeline 30. By providing the third delivery pipeline 30 and the fourth delivery pipeline 40, it is convenient to transport carbon dioxide and carbon-depleted solution, and the transportation is convenient. The length, radial size, material, etc. of the third delivery pipeline 30 and the fourth delivery pipeline 40 can be set according to the needs, and the present disclosure does not limit this.

[0050] Optionally, the carbon dioxide delivery system further includes a sixth valve (not shown) and a seventh valve (not shown), the sixth valve being disposed on the third delivery pipeline 30, and the seventh valve being disposed on the fourth delivery pipeline 40. This facilitates controlling the opening and closing of the third delivery pipeline 30 and the fourth delivery pipeline 40.

[0051] The purification unit 25 includes a condenser 251 and a carbon dioxide purification unit 252, wherein the inlet of the condenser 251 is connected to the top outlet of the stripping tower 23, and the outlet of the condenser 251 is connected to the inlet of the carbon dioxide purification unit 252. The carbon dioxide purification unit 252 may be, for example, a distillation tower, but the present disclosure does not limit the specific type of the carbon dioxide purification unit 252.

[0052] In another embodiment, the carbon dioxide delivery system also includes a first pressure detection device and a second pressure detection device. The first pressure detection device is arranged on the first delivery pipeline 10, and the second pressure detection device is arranged on the second delivery pipeline 20, so as to facilitate the detection of the pressure of the first delivery pipeline 10 and the second delivery pipeline 20 to avoid safety accidents.

[0053] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0055] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A carbon dioxide delivery system, characterized in that: The carbon dioxide delivery system comprises a first delivery unit and a second delivery unit; The first delivery unit includes a compressor, a first feed pump, a first heat exchanger, an absorption tower and a first separation tank, wherein the inlet of the compressor is used to communicate with the carbon dioxide collection pipeline, the outlet of the compressor is communicated with the inlet of the first heat exchanger, the outlet of the first heat exchanger is communicated with the inlet of the absorption tower, and the bottom outlet of the absorption tower is communicated with the inlet of the first separation tank; The second conveying unit includes a second feed pump, a second heat exchanger, a stripping tower, a second separation tank and a purification unit, the inlet of the second feed pump is connected to the bottom outlet of the first separation tank, the outlet of the second feed pump is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the inlet of the stripping tower, the bottom outlet of the stripping tower is connected to the inlet of the second separation tank, the top outlet of the stripping tower is connected to the purification unit, the bottom outlet of the second separation tank is connected to the inlet of the first feed pump, and the outlet of the first feed pump is connected to the inlet of the first heat exchanger.

2. The carbon dioxide delivery system according to claim 1, characterized in that: The carbon dioxide delivery system also includes a first delivery pipeline and a second delivery pipeline; One end of the first delivery pipeline is in communication with the bottom outlet of the first separation tank, and the other end of the first delivery pipeline is in communication with the inlet of the second feed pump, so as to deliver the carbon-rich solution flowing out of the bottom outlet of the first separation tank; One end of the second delivery pipeline is connected to the bottom outlet of the second separation tank, and the other end of the second delivery pipeline is connected to the inlet of the first feed pump, so as to deliver the carbon-depleted solution flowing out from the bottom outlet of the second separation tank.

3. The carbon dioxide delivery system according to claim 2, characterized in that: The carbon dioxide delivery system further includes a first valve and a second valve, wherein the first valve is disposed on the first delivery pipeline, and the second valve is disposed on the second delivery pipeline.

4. The carbon dioxide delivery system according to claim 1, characterized in that: The carbon dioxide delivery system also includes a first gas-phase discharge pipeline, a second gas-phase discharge pipeline and a third gas-phase discharge pipeline. The first gas-phase discharge pipeline is connected to the top outlet of the absorption tower, the second gas-phase discharge pipeline is connected to the top outlet of the first separation tank, and the third gas-phase discharge pipeline is connected to the top outlet of the second separation tank.

5. The carbon dioxide delivery system according to claim 4, characterized in that: The carbon dioxide delivery system also includes a third valve, a fourth valve and a fifth valve. The third valve is arranged on the first gas phase discharge pipeline, the fourth valve is arranged on the second gas phase discharge pipeline, and the fifth valve is arranged on the third gas phase discharge pipeline.

6. The carbon dioxide delivery system according to claim 1, characterized in that: The carbon dioxide delivery system also includes a third delivery pipeline and a fourth delivery pipeline, one end of the third delivery pipeline is connected to the outlet of the compressor, and the other end of the third delivery pipeline is connected to the inlet of the first heat exchanger, one end of the fourth delivery pipeline is connected to the outlet of the first feed pump, and the other end of the fourth delivery pipeline is connected to the third delivery pipeline.

7. The carbon dioxide delivery system according to claim 6, characterized in that: The carbon dioxide delivery system further includes a sixth valve and a seventh valve, wherein the sixth valve is disposed on the third delivery pipeline, and the seventh valve is disposed on the fourth delivery pipeline.

8. The carbon dioxide delivery system according to claim 1, characterized in that: The purification unit comprises a condenser and a carbon dioxide purification unit, wherein the inlet of the condenser is communicated with the top outlet of the stripping tower, and the outlet of the condenser is communicated with the inlet of the carbon dioxide purification unit.

9. The carbon dioxide delivery system according to claim 2, characterized in that: The inner surface of the first conveying pipeline is provided with a first anti-corrosion layer, and the inner surface of the second conveying pipeline is provided with a second anti-corrosion layer.

10. The carbon dioxide delivery system according to claim 2, characterized in that: The carbon dioxide delivery system further includes a first pressure detection component and a second pressure detection component, wherein the first pressure detection component is disposed on the first delivery pipeline, and the second pressure detection component is disposed on the second delivery pipeline.

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