A multi-production system of integrated coal gasification combined cycle (IGCC) coupling refining and chemical and application thereof

Abstract

The present application relates to the field of petrochemical technology, and discloses a refining and chemical energy coupling IGCC multi-production system and application thereof, the system comprises a gasifier, a shift system connected with the gasifier, and a carbon dioxide capture system connected with the power generation system and the shift system respectively, the carbon dioxide capture system comprises a low-temperature methanol washing carbon dioxide device, a flue gas heat exchange device, and a carbon dioxide adsorption device; the carbon dioxide capture system utilizes the heat energy in the flue gas and the cooling energy of the low-temperature methanol washing carbon dioxide device to capture the low-concentration carbon dioxide in the flue gas, and the energy consumption is low and the energy conversion efficiency is high; the present application collects the carbon dioxide generated by the power generation system and the carbon dioxide generated by the shift system into carbon dioxide raw materials, and uniformly redistributes the obtained carbon dioxide raw materials to produce food-grade dry ice, DMC, PPC, methanol, acetic acid and other products, realizing zero carbon dioxide emission and significantly increasing economic benefits.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, and in particular to a refining, chemical, energy and chemical coupled IGCC multi-generation system and its application. Background Technology

[0002] IGCC stands for Integrated Gasification Combined Cycle Power Generation System. This system is an advanced power system that combines coal gasification technology with a highly efficient combined cycle. The system can convert by-products such as petroleum coke and coal coke into coal gas, and then use the coal gas for combustion to generate energy. The system has both high power generation efficiency and excellent environmental performance.

[0003] Those skilled in the art have discovered that IGCC systems can generate other resources in addition to power generation. Therefore, in order to improve the economic efficiency of IGCC systems, those skilled in the art have developed IGCC polygeneration systems based on IGCC systems, such as the IGCC polygeneration system disclosed in publication number CN113072422B. This system can produce gaseous products such as nitrogen, oxygen, argon, hydrogen, and carbon dioxide, as well as chemical products such as methanol, methane, and ammonia. In addition, it can also produce products such as electricity, iron, aluminum, alumina, and cenospheres, realizing the IGCC polygeneration technology and greatly improving energy conversion efficiency.

[0004] This invention, through in-depth research on existing IGCC polygeneration systems, has found that these systems have low or no utilization of the captured CO2. Since carbon dioxide gas has a high content in IGCC systems and is a significant and usable resource, this invention addresses these issues by providing a refining-chemical-energy-chemical coupled IGCC polygeneration system. Summary of the Invention

[0005] To overcome the problem of low or no utilization of captured CO2 in existing IGCC (Integrated Gas Conversion) polygeneration systems, a refining-chemical-energy-chemical coupled IGCC polygeneration system and its application are provided. This system simultaneously captures high-concentration CO2 generated by the conversion system and low-concentration CO2 generated by the power generation system through a CO2 capture system, resulting in low capture energy consumption and high energy utilization. This application method can reuse refining by-products as raw materials and convert them into new products. It can also collect the separated CO2 to produce new products such as food-grade dry ice, DMC, PPC, nitrogen, oxygen, argon, hydrogen, CO2, methanol, acetic acid, and ammonia, achieving resource reuse, avoiding emissions of refining by-products, truly achieving zero carbon emissions, and realizing efficient energy utilization and conversion.

[0006] The specific technical solution of this invention is as follows: A refining and energy-coupling IGCC (Integrated Gasification and Combustion Control) multi-generation system includes a gasifier, a conversion system connected to the gasifier, and a carbon dioxide capture system connected to both a power generation system and the conversion system. The carbon dioxide capture system includes a low-temperature methanol washing carbon dioxide unit, a flue gas heat exchanger, and a carbon dioxide adsorption unit connected to both the flue gas heat exchanger and the low-temperature methanol washing carbon dioxide unit. The carbon dioxide adsorption unit includes a tank, packing material disposed within the tank, a flue gas coil, and a heat exchange coil. The packing material is located within the gap between the flue gas coil and the heat exchange coil. The flue gas coil is connected to the flue gas heat exchanger, which is connected to the power generation system. The heat exchange coil is connected to both the flue gas heat exchanger and the low-temperature methanol washing carbon dioxide unit.

[0007] This invention provides a refining and energy-chemical coupled IGCC multi-generation system. This system captures carbon dioxide from the shift gas generated by the shift system and the flue gas generated by the power generation system through a carbon dioxide capture system, and performs product conversion on the captured carbon dioxide. The carbon dioxide capture system of this invention utilizes the thermal energy in the flue gas and the cooling energy of the low-temperature methanol washing carbon dioxide unit to capture low-concentration carbon dioxide in the flue gas. The carbon dioxide capture energy consumption is low and the energy conversion efficiency is high. The present invention employs a steam-carbon monoxide shift reaction to convert syngas into a shift gas containing hydrogen and high-concentration carbon dioxide. Existing technologies directly use a low-temperature methanol-wash carbon dioxide unit to capture and separate carbon dioxide from the shift gas. However, the flue gas generated by the power generation system has a low carbon dioxide concentration and contains other high-concentration acidic gases, making it impossible to use a low-temperature methanol-wash carbon dioxide unit to capture carbon dioxide from the flue gas. Currently, commonly used carbon dioxide capture systems consist of two independent units: a monoethanolamine separation unit and a low-temperature methanol-wash carbon dioxide unit. However, the present invention has found that the aforementioned carbon dioxide capture devices suffer from high energy consumption and low energy utilization efficiency in the IGCC system. Therefore, to solve the above problems, this invention designs a new carbon dioxide capture system. This system consists of a low-temperature methanol-wash carbon dioxide unit, a flue gas heat exchange unit, and multiple carbon dioxide adsorption units. The carbon dioxide adsorption unit comprises a flue gas coil, a heat exchange coil, and packing material placed between the flue gas coil and the heat exchange coil. During operation, the high-heat flue gas generated by the power generation system is input into the flue gas heat exchange unit, where the heat energy in the flue gas is stored and low-temperature flue gas is produced. This heat energy obtained after heat exchange can be used for desorption in the carbon dioxide adsorption unit. The carbon dioxide adsorption unit has two states: adsorption and desorption. When the carbon dioxide adsorption unit is in the adsorption state, it can adsorb low-concentration carbon dioxide in the low-temperature flue gas. When the packing material adsorbs a certain amount of carbon dioxide... Once saturated, the carbon dioxide adsorption device switches to desorption mode, using the heat energy stored in the flue gas heat exchanger to heat the packing material, releasing the carbon dioxide and reusing it for the next adsorption cycle. Because the carbon dioxide adsorption device needs to switch between adsorption and desorption states, multiple adsorption devices need to be used in combination to ensure continuous carbon dioxide capture. Furthermore, the packing material used in this device is a temperature-switching carbon dioxide adsorption material, which can physically adsorb carbon dioxide through temperature changes. This material can also be reused after desorption. This device can utilize the heat and cooling energy generated during production to adsorb low-concentration carbon dioxide in the flue gas, significantly improving energy conversion efficiency, reducing production energy consumption, and being an environmentally friendly, pollution-free physical adsorption device.

[0008] Preferably, the filler is a carbon dioxide temperature-switching adsorbent.

[0009] The carbon dioxide temperature-changing adsorbent of the present invention is preferably an activated carbon adsorbent doped with metal oxides. During the preparation process, the metal oxides are chemically doped onto the activated carbon adsorbent, which significantly improves the thermal conductivity of the activated carbon adsorbent, thereby improving the energy conversion efficiency of the packing and thus improving the carbon dioxide capture efficiency.

[0010] Preferably, the flue gas coil includes several parallel heating ends, and the wall of the venting end is provided with several air holes.

[0011] Preferably, the cooling pipe includes several heat exchange ends connected in parallel.

[0012] This invention features a permeable end on the flue gas coil and a heat exchange end on the cooling coil. Packing material is filled into the gap between the permeable end and the heat exchange end, significantly increasing the contact area between the packing material and the permeable end and the heat exchange end. At the same time, the heating end and the heat exchange end are evenly distributed between the packing material, which can significantly improve the mass transfer efficiency between carbon dioxide and the packing material, and significantly improve the energy conversion rate between the heat exchange coil and the packing material.

[0013] Preferably, the gasifier is equipped with an air separation system.

[0014] Preferably, the air separation system is connected to an ammonia synthesis system, and the ammonia synthesis system is connected to a conversion system.

[0015] Preferably, the gasifier is also equipped with a purification system, which is connected to the power generation system and the conversion system respectively.

[0016] Preferably, the carbon dioxide capture system is connected to a product gas system and a catalytic reforming system.

[0017] An application of the above-mentioned refining, chemical, energy and chemical coupled IGCC multi-product system includes the following steps: Step 1: Air enters the air separator to produce argon, oxygen and nitrogen; Step 2: Oxygen and coal enter the gasifier to produce crude syngas. The crude syngas then enters the purification device to remove gases and dust, producing syngas and fuel gas. Step 3: Fuel gas enters the power generation system to produce electricity, steam, and flue gas; Step 4: Syngas enters the steam-to-carbon dioxide conversion unit to convert steam into shift gas; Step 5: The shift gas and flue gas enter the carbon dioxide capture system. The shift gas is captured and separated into high-concentration carbon dioxide in the low-temperature methanol washing carbon dioxide unit, and the flue gas is captured and separated into low-concentration carbon dioxide in the carbon dioxide adsorption unit. The high-concentration carbon dioxide and low-concentration carbon dioxide are combined to form carbon dioxide feedstock. The carbon dioxide feedstock enters one or both of the catalytic reforming system and the product gas system.

[0018] Preferably, the refining byproducts include one of petroleum coke, petroleum tar, organic waste liquid, and unconverted oil residue.

[0019] This invention also provides an application method for the aforementioned refining and energy-coupling IGCC multigeneration system. Firstly, in traditional IGCC multigeneration systems, each unit operates independently, resulting in low energy conversion efficiency between units and direct emission of some carbon dioxide byproducts, leading to low resource utilization efficiency. In contrast, this invention designs the IGCC multigeneration system with efficient energy conversion as the fundamental goal, achieving multigeneration production while simultaneously realizing efficient energy conversion. Traditional power generation units primarily consist of single combustion power generation devices, which cannot fully utilize the released heat energy. This invention couples the combustion power generation device with a steam power generation device, allowing the steam power generation device to utilize the heat energy generated by the combustion power generation device for steam power generation, significantly improving energy conversion efficiency. Furthermore, traditional IGCC multigeneration systems typically collect carbon dioxide at the tail end of the combustion unit, resulting in low calorific value of the combustible gas entering the combustion unit. This invention separates carbon dioxide from the combustible gas before combustion and converts it into shift gas through a shift system, significantly improving the combustion efficiency of the combustible gas and thus significantly increasing the power generation system's production efficiency. This application also collects high-concentration carbon dioxide in the shift gas and low-concentration carbon dioxide in the flue gas simultaneously as carbon dioxide feedstock, achieving zero carbon dioxide emissions. In addition, the carbon dioxide feedstock collected by this invention is uniformly redistributed to the catalytic reforming system and product gas system to produce food-grade dry ice, DMC, PPC, methanol, acetic acid and other products, resulting in high product yield and significantly increased economic benefits.

[0020] Preferably, the refining byproducts include one or two of petroleum coke, petroleum tar, organic waste liquid, and unconverted oil residue.

[0021] Compared with the prior art, this application has the following technical effects: (1) The present invention captures carbon dioxide from the conversion gas generated by the conversion system and the flue gas generated by the power generation system through a carbon dioxide capture system, and converts the captured carbon dioxide into products. The carbon dioxide capture system of the present invention uses the heat energy in the flue gas and the cooling energy of the low temperature methanol washing carbon dioxide device to capture low concentration carbon dioxide in the flue gas. The carbon dioxide capture energy consumption is low and the energy conversion efficiency is high. (2) In this invention, refining by-products are reused as raw materials in the gasifier; (3) The present invention collects carbon dioxide generated by the power generation system and carbon dioxide generated by the conversion system into carbon dioxide raw materials, and then redistributes the obtained carbon dioxide raw materials to the catalytic reforming system and the product gas system to produce food-grade dry ice, DMC, PPC, methanol, acetic acid and other products. This achieves zero carbon dioxide emissions and significantly increases economic benefits. Attached Figure Description

[0022] Figure 1 This is an application flowchart of the refining, chemical, energy and chemical coupling IGCC multi-product system of the present invention.

[0023] Figure 2 This is a cross-sectional view of the carbon dioxide adsorption device of the present invention.

[0024] In the figure, tank 1, packing 2, flue gas coil 3, heating end 301, heat exchange coil 4, and heat exchange end 401 are shown. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments.

[0026] Example 1: like Figure 1 As shown, a refining and energy-coupling IGCC multi-generation system includes an air separation system, a gasifier, a purification system, a shift conversion system, a catalytic reforming system, a product gas system, a synthetic ammonia system, a power generation system, and a carbon dioxide capture system. The air separation system is an air separator, the purification system is a purification device, the shift conversion system is a water-gas shift conversion device, the catalytic reforming system is a dry reforming device, the synthetic ammonia system is an ammonia synthesis device, the product gas system includes a dry ice device, a DMC device, and a PPC device, and the power generation system includes a combustion power generation device and a steam power generation device. The air separator is equipped with oxygen and nitrogen output pipes. The oxygen output pipe is connected to the gasifier, and the nitrogen output pipe is connected to the ammonia synthesis unit. The gasifier is equipped with a crude synthesis output pipe, which is connected to a purification unit. The purification unit is equipped with a synthesis gas output pipe and a fuel gas output pipe. The synthesis gas output pipe is connected to a water-gas conversion unit. The water-gas conversion unit is connected to a carbon dioxide capture system. The fuel gas output pipe is connected to a combustion power generation unit. The steam power generation unit uses the heat energy generated by the combustion power generation unit to generate electricity. The combustion power generation unit is equipped with a flue gas output pipe, which is connected to the carbon dioxide capture system. The carbon dioxide capture system includes a cryogenic methanol washing carbon dioxide unit, a flue gas heat exchange unit, and a carbon dioxide adsorption unit, such as... Figure 2As shown, the carbon dioxide adsorption device includes a tank 1, a flue gas coil 3 and a heat exchange coil 4 installed inside the tank, and a packing 2 located in the gap between the flue gas coil and the heat exchange coil. The flue gas coil has multiple parallel vent ends 301, and the tube wall of the vent ends has multiple pores arranged in a row. The heat exchange coil has multiple parallel heat exchange ends 401. The heating end and the heat exchange end are evenly arranged between the packing. The packing is an activated carbon temperature-switching adsorbent doped with alumina (activated carbon adsorbent, the adsorption capacity at 0℃ to 100℃ under standard atmospheric pressure is 2.45 mmol / g to 3.59 mmol / g). The flue gas heat exchange device is connected to the flue gas output pipe. The flue gas heat exchange device is equipped with a heating pipe and a low-temperature flue gas output pipe. The heating pipe is connected to the heat exchange coil. The low-temperature methanol washing carbon dioxide device is equipped with a cooling pipe, which is connected to the heat exchange coil. The low-temperature flue gas output pipe is connected to the flue gas coil. The adsorption process of the carbon dioxide adsorption device includes: the cooling energy generated by the low-temperature methanol washing carbon dioxide device is used to quickly cool the packing through the heat exchange coil so that the packing can reach the optimal carbon dioxide adsorption temperature. Then, the low-temperature flue gas is introduced into the carbon dioxide adsorption device through the flue gas coil so that the packing can adsorb carbon dioxide. The desorption process of the carbon dioxide adsorption device includes: the heat energy of the flue gas heat exchanger heats the packing material through the heat exchange coil, and the packing material adsorbing carbon dioxide undergoes desorption under the heating state to complete the removal of carbon dioxide.

[0027] Example 2: An application of the refining, chemical, energy, and chemical coupled IGCC multi-product system of Example 1 includes the following steps: Step 1: Air enters the air separator to produce argon, oxygen and nitrogen; Step 2: Oxygen and coal enter the gasifier to produce crude syngas. The crude syngas then enters the purification device to remove gases and dust, producing syngas and fuel gas. Step 3: Fuel gas enters the power generation system to produce electricity, steam, and flue gas; Step 4: Syngas enters the steam-to-carbon dioxide conversion unit to convert steam into shift gas; Step 5: The shift gas and flue gas enter the carbon dioxide capture system. The shift gas captures and separates high-concentration carbon dioxide in the low-temperature methanol washing carbon dioxide unit, and the flue gas captures and separates low-concentration carbon dioxide in the carbon dioxide adsorption unit. The high-concentration carbon dioxide and low-concentration carbon dioxide are combined to produce carbon dioxide feedstock. The carbon dioxide feedstock enters the product gas system to produce food-grade dry ice, DMC and PPC.

[0028] Example 3: An application of the refining, chemical, energy, and chemical coupled IGCC multi-product system of Example 1 includes the following steps: Step 1: Air enters the air separator to produce argon, oxygen and nitrogen; Step 2: Oxygen, coal and petroleum coke enter the gasifier to produce crude syngas. The crude syngas enters the purification device to remove gases and dust, producing syngas and fuel gas. Step 3: Fuel gas enters the power generation system to produce electricity, steam, and flue gas; Step 4: Syngas enters the steam-to-carbon dioxide conversion unit to convert steam into shift gas; Step 5: The shift gas and flue gas enter the carbon dioxide capture system. The shift gas captures and separates high-concentration carbon dioxide in the low-temperature methanol washing carbon dioxide unit, and the flue gas captures and separates low-concentration carbon dioxide in the carbon dioxide adsorption unit. The high-concentration carbon dioxide and low-concentration carbon dioxide are combined to form carbon dioxide feedstock, which enters the catalytic reforming system to produce methanol and acetic acid.

[0029] Example 4: An application of the refining, chemical, energy, and chemical coupled IGCC multi-product system of Example 1 includes the following steps: Step 1: Air enters the air separator to produce argon, oxygen and nitrogen; Step 2: Oxygen, coal and petroleum coke enter the gasifier to produce crude syngas. The crude syngas enters the purification device to remove gases and dust, producing syngas and fuel gas. Step 3: Fuel gas enters the power generation system to produce electricity, steam, and flue gas; Step 4: Syngas enters the steam-to-carbon dioxide conversion unit to convert steam into shift gas; Step 5: The shift gas and flue gas enter the carbon dioxide capture system. The shift gas is captured and separated into hydrogen and high-concentration carbon dioxide in the low-temperature methanol washing carbon dioxide unit. The flue gas is captured and separated into low-concentration carbon dioxide in the carbon dioxide adsorption unit. The high-concentration carbon dioxide and low-concentration carbon dioxide are combined to produce carbon dioxide feedstock. Part of the carbon dioxide feedstock enters the product gas system to produce food-grade dry ice, DMC and PPC. Another part of the carbon dioxide feedstock enters the catalytic reforming system to produce methanol and acetic acid. Hydrogen and nitrogen enter the ammonia synthesis system to produce ammonia.

[0030] Comparative Example 1 Compared with Example 4, the carbon dioxide capture system in Comparative Example 1 consists of an ethanolamine capture device and a low-temperature methanol washing carbon dioxide device, and the other conditions are the same as in Example 1.

[0031] Comparative Example 2 Compared with Example 4, the packing material in the carbon dioxide adsorption device in Comparative Example 2 is activated carbon temperature-switching adsorbent without alumina doping, and the other conditions are the same as in Example 1.

[0032] Detection example The product conversion and economic benefits of Examples 1 to 4 above were statistically analyzed, and the results are shown in Table 1. Table 1 Product Conversion Data and Economic Benefits

[0033] As shown in Table 1, in the applications of Examples 2 to 4, the annual production of carbon dioxide feedstock can reach 2.02 million to 2.12 million tons / year. The carbon dioxide feedstock can produce products such as dry ice, DMC, PPC, methanol, and acetic acid, which can directly generate economic benefits of 9.8 to 10.6 billion yuan. The above results show that the application method of this application can effectively collect carbon dioxide in the IGCC polygeneration system and convert it into other products, which can significantly increase economic benefits and significantly reduce carbon emissions. In addition, in Examples 3 to 5, petroleum coke tar, a by-product of coal refining, is also used as a raw material for conversion. This can convert refining by-products into products while reducing the use of coal resources, significantly improving resource utilization, energy conversion efficiency, and economic benefits.

[0034] The energy consumption per ton of carbon dioxide captured by the carbon dioxide capture systems in Examples 2 to 4 and Comparative Examples 1 to 2 was statistically analyzed, and the results are shown in Table 2. Table 2. Energy consumption per ton of carbon dioxide captured by the carbon dioxide capture systems of Examples 2 to 4 and Comparative Examples 1 to 2.

[0035] The average comprehensive energy consumption of the carbon dioxide capture systems in Examples 2 to 4 for capturing one ton of carbon dioxide is 5.01 GJ, while the average comprehensive energy consumption of the carbon dioxide capture systems in Comparative Examples 1 and 2 for capturing one ton of carbon dioxide is 2.35 GJ. It can be seen that the energy consumption of the carbon dioxide capture system of the present invention is significantly reduced compared to the carbon dioxide capture system composed of a monoethanolamine capture device and a low-temperature methanol washing carbon dioxide device. By comparing the heat exchange efficiency of the temperature-changing adsorbent packing in Example 4 and Comparative Example 2, it was found that the heat exchange efficiency of Example 1 can reach 0.32MW, while the heat exchange efficiency of Comparative Example 2 is only 0.33MW. It can be seen that the thermal conductivity of the alumina-doped activated carbon adsorbent is significantly improved after metal doping, thereby significantly increasing the heat exchange rate of the adsorbent during the heat exchange process, and significantly increasing the carbon dioxide capture efficiency in the flue gas of the present invention.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A refining, chemical, energy, and chemical coupled IGCC multi-generation system, characterized in that, The system includes a gasifier and a carbon dioxide capture system. The gasifier is connected to a purification device. The purification device is equipped with a fuel gas output pipe connected to a combustion power generation device and a water-gas conversion device connected to a syngas output pipe. The carbon dioxide capture system includes a low-temperature methanol washing carbon dioxide device, a flue gas heat exchange device, and a carbon dioxide adsorption device. The carbon dioxide adsorption device includes a tank (1), a flue gas coil (3) and a heat exchange coil (4) installed in the tank, and a packing material (2) located in the gap between the flue gas coil and the heat exchange coil. The packing material is an activated carbon temperature-changing adsorbent doped with alumina. The water-gas conversion device is connected to the low-temperature methanol washing carbon dioxide device. The combustion power generation device is equipped with a flue gas output pipe connected to the flue gas heat exchange device. The low-temperature methanol washing carbon dioxide device is equipped with a cooling pipe connected to the heat exchange coil. The flue gas heat exchange device is equipped with a low-temperature flue gas output pipe connected to the flue gas coil and a heating pipe connected to the heat exchange coil.

2. The refining, chemical, energy, and chemical coupled IGCC multi-product system according to claim 1, characterized in that, The flue gas coil includes several parallel venting ends (301), and the venting end has several air holes on its pipe wall.

3. The refining, chemical, energy, and chemical coupled IGCC multi-product system according to claim 1, characterized in that, The heat exchange coil includes several parallel heat exchange ends (401).

4. The refining, chemical, energy, and chemical coupled IGCC multi-product system according to claim 1, characterized in that, The gasifier is equipped with an air separation system, which is connected to an ammonia synthesis system.

5. The refining, chemical, energy, and chemical coupled IGCC multi-product system according to claim 1, characterized in that, The carbon dioxide capture system is connected to a product gas system and a catalytic reforming system. The product gas system includes a dry ice unit, a DMC unit, and a PPC unit.

6. The refining, chemical, energy, and chemical coupled IGCC multi-product system according to claim 1, characterized in that, The combustion power generation unit is coupled with a steam power generation unit.

7. An application of a refining, chemical, energy, and chemical coupled IGCC multi-product system according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Air enters the air separator to produce argon, oxygen and nitrogen; Step 2: Oxygen, coal and refining byproducts enter the gasifier to produce crude syngas. The crude syngas then enters the purification unit to remove gases and dust, producing syngas and fuel gas. Step 3: Fuel gas enters the power generation system to produce electricity, steam, and flue gas; Step 4: Syngas enters the steam-to-carbon dioxide conversion unit to convert steam into shift gas; Step 5: The shift gas and flue gas enter the carbon dioxide capture system. The shift gas is captured and separated into high-concentration carbon dioxide in the low-temperature methanol washing carbon dioxide unit, and the flue gas is captured and separated into low-concentration carbon dioxide in the carbon dioxide adsorption unit. The high-concentration carbon dioxide and low-concentration carbon dioxide are combined to produce carbon dioxide feedstock.

8. The application according to claim 7, characterized in that, The refining byproducts include one of petroleum coke, petroleum tar, organic waste liquid, and unconverted oil residue.

Images