Support for carbon dioxide sequestration, method of preparing this support and equipment for preparing the support

Abstract

A medium for CO2 sequestration, comprising, in weight percent, the following components: quartz: from 30.10 to 40.45%; borax: from 8.75 to 14.3%; calcium oxide: from 5.13 to 7.20%; magnesium oxide: from 5.50 to 7.52%; sodium carbonate: from 1.87 to 3.47%; sodium sulfate: from 0.12 to 0.53%; sodium phosphate: from 0.23 to 0.82%; a stable dispersant: from 0.06 to 0.33%; a surfactant: from 0.02 to 0.13%; and water: from 35 to 45%. A method of preparing the medium for CO2 sequestration comprises: preparing a slurry; the preparation of a precursor of a support for CO2 sequestration; and the preparation of a support for CO2 sequestration. The support according to the invention contains gaseous carbon dioxide, which makes it possible to store carbon and achieve the objective of "carbon neutrality" as soon as possible. Figure 1

Description

Title of the invention: Support for carbon dioxide sequestration, method for preparing this support and equipment for preparing the support Technical field

[0001] The present invention relates to the field of preparation of non-metallic materials, and more particularly to a support for the sequestration of CO2, a method for preparing this support and equipment for preparing the support. CONTEXT

[0002] In the context of global climate change, the increase in greenhouse gas emissions has led to a continuous deterioration of the greenhouse effect, seriously affecting the survival and development of humankind. Controlling carbon dioxide emissions is considered a key measure to slow down global climate change. China has proposed a strategic goal of "dual carbon target": "carbon peak" by 2030 and "carbon neutrality" by 2060. Compared with other developed countries, China has a shorter time frame for achieving carbon neutrality, a faster rate of carbon emission reduction, and greater difficulty in achieving this goal. Industries such as construction and energy are making progress towards the dual carbon goal. These and other industries have undertaken in-depth reforms and transformations to achieve dual carbon goals.However, it remains difficult to achieve significant carbon emission reduction effects in the short term.

[0003] Carbon capture and storage (CCS) technology is a key means to achieve carbon neutrality globally. In particular, CCS technology is indispensable for China's power industry and industrial sectors where emission reduction is difficult, as their carbon emissions account for nearly 70% of the national CO2 emissions. CCS technology involves separating carbon dioxide generated by industrial sectors and then storing it in suitable media. Although CCS technology plays an important role in reducing carbon dioxide emissions, the current technological level still has significant limitations and challenges. CCS technology can be mainly divided into two types: physical storage and chemical sequestration. The technical principles are as follows: (1) storage in closed-pore structures; (2) sequestration by chemical reactions.CO2 storage media are currently mainly geological structures such as underground rocks, oil and gas deposits. depleted and salt water layers on the seabed. The investment cost of the entire technology is high, and the sealed storage media are difficult to reuse and have significant leakage risks. Therefore, it is difficult to promote and apply this technology on a large scale in the absence of obvious economic benefits. SUMMARY

[0004] The invention aims to solve the problems related to the high risk of leakage and the difficulty of reusing the supports in conventional CSC technology.

[0005] More specifically, the invention provides a CO2 capture and sequestration support, comprising the following components, in weight percentage:

[0006] quartz: from 30.10 to 40.45%;

[0007] borax: from 8.75 to 14.3%;

[0008] calcium oxide: from 5.13 to 7.20%;

[0009] magnesium oxide: from 5.50 to 7.52%;

[0010] sodium carbonate: from 1.87 to 3.47%;

[0011] sodium sulfate: from 0.12 to 0.53%;

[0012] sodium phosphate: from 0.23 to 0.82%;

[0013] a stable dispersant: from 0.06 to 0.33%;

[0014] a surfactant: from 0.02 to 0.13%; and

[0015] water: 35 to 45%.

[0016] The stable dispersant is sodium polyacrylate, sodium tripolyphosphate, polyethylene glycol or a mixture thereof.

[0017] The surfactant is a fluorocarbon-based surfactant or an organosilicon-based surfactant.

[0018] The function of calcium oxide and magnesium oxide is to react with CO2 in the atmosphere during the support preparation process, in order to chemically absorb the CO2.

[0019] The method of preparing the support for CO2 sequestration comprises the following steps:

[0020] 1) preparation of a mud

[0021] 2) from the mud, prepare a precursor of a support for the sequestration of the CO2; and

[0022] 3) from the precursor of a support for the sequestration of CO2, preparation of a support for CO2 sequestration.

[0023] More specifically, in 1), the components are weighted, mixed and stirred for 10-20 min; a resulting mixture is pumped to a ball mill, to give a slurry with a solids content of 55-65% and a particle size of < 10 qm.

[0024] In 2), the slurry prepared in 1) is pumped and transported to a spray granulation machine; the spray granulation machine has an air inlet temperature of 260-450°C, an air outlet temperature of 120-160°C, and a centrifugal speed of 10000-16500 rpm for spray granulation; carbon dioxide is used as the spray gas, and the collected powders are the precursor of a carrier for CO2 sequestration, with a diameter of 1-100 pm.

[0025] In 3), the precursor of a support for CO2 sequestration obtained in 2) is pumped to an upper section of a main tower; descending from the upper section of the main tower to a lower cone, the precursor is vitrified at high temperature, forming the support for CO2 sequestration; the temperature of the main tower is 600-900°C, and at the same time, the operation of distributing carbon dioxide gas is carried out.

[0026] The main tower comprises a gas distribution system and a heating system. The gas supplied by the gas distribution system is carbon dioxide, and the temperature in the high-temperature zone of the heating system is 600-900°C, so as to create reaction conditions for the chemical absorption of CO2 and accelerate the solidification reaction of CO2.

[0027] The sources of carbon dioxide in the carrier are as follows: (1) carbon dioxide introduced in the spray granulation and vitrification process is absorbed and solidified by chemical reaction of magnesium oxide and calcium oxide in the raw materials; (2) carbon dioxide is involved in the formation of closed porous structures of the carrier, leading to physical storage.

[0028] The present invention also provides a device for preparing a support for the sequestration of CO2.

[0029] The device comprises an energy-saving high-temperature furnace; the energy-saving high-temperature furnace comprises a main tower; the main tower comprises an upper section; a slurry hopper is connected to the top of the upper section of the main tower via a guide vane; a bottom side of the upper section is connected to a first recycling unit; an upper portion of the first recycling unit is connected to a second recycling unit via a first pipeline, and an upper portion of the second recycling unit is connected to an induced draft fan via a second pipeline; a lower portion of the first recycling unit and a lower portion of the second recycling unit are respectively connected to a material storage warehouse via pipelines; and

[0030] A lower section of the main tower is tapered, and a bottom of the lower section of the main tower includes a vent hole.

[0031] The device further comprises an outlet pipe of a hot air furnace and an exhaust pipe; the outlet pipe of the hot air furnace is connected to the guide vane; one end of the exhaust pipe is connected to the guide vane, and the other end is connected to the induced draft fan.

[0032] The invention integrates physical storage and chemical storage of carbon dioxide, thereby improving carbon storage capacity.

[0033] In the preparation method, the preparation atmosphere is carbon dioxide, and during the formation of the porous structure of the support, the carbon dioxide is wrapped in the hollow structure to be stored.

[0034] In the preparation method, raw materials are used which can react with carbon dioxide in the preparation atmosphere, thereby improving the carbon fixation capacity of the support.

[0035] The CO2 sequestration medium provided by the invention has a closed-pore internal structure that encapsulates a large amount of carbon dioxide, thereby reducing the risk of leakage compared to conventional storage media.

[0036] The spray granulation method and the proportion of its components used in the invention have a high efficiency, and the prepared carrier has a narrow particle size distribution, a large porosity and a high closed porosity, which increases the enclosed space required for carbon dioxide storage, thereby improving the carbon dioxide storage rate.

[0037] The first and second recycling units of the invention increase the recovery rate of the media for CO2 sequestration, by preventing the media from being drawn into the induced draft fan or discharged into the surrounding environment.

[0038] The support provided by the invention has excellent mechanical and thermal insulation properties, can be reused and is suitable for industrial fields such as architecture, coatings, plastics, etc. Brief description of the drawings

[0039] [Fig-1] [Fig.l] is a schematic diagram of a device for preparing a support for CO2 sequestration according to the invention.

[0040] 1. Outlet pipe of the hot air furnace; 2. Mud hopper; 3. Guide vane; 4. main tower; 5. first recycling unit; 6. second recycling unit; 7. induced draft fan; 8. exhaust pipe; 9. materials storage warehouse. DETAILED DESCRIPTION

[0041] To better describe the invention, a support for CO2 sequestration, a method for preparing this support and a device for preparing the support will be described in more detail in conjunction with embodiments. However, the invention is not limited to these embodiments.

[0042] The present invention relates to a method for preparing a support for CO2 sequestration, and the method comprises the following steps:

[0043] 1) preparation of a slurry: the components are weighed, mixed and stirred for 10 at 20 minutes; the resulting mixture is pumped into a ball mill, to obtain a slurry with a solids content of 55 to 65% and a particle size of < 10 qm;

[0044] 2) preparation of a precursor of a support for the sequestration of CO2: the slurry prepared in 1) is pumped and transported to a spray granulation machine; the spray granulation machine has an air inlet temperature of 260-450°C, an air outlet temperature of 120-160°C, and a centrifugal speed of 10000-16500 rpm for spray granulation; carbon dioxide is used as the spray gas, and the collected powders form the precursor of a carrier for CO2 sequestration, with a diameter of 1-100 qm; the obtained precursor has the characteristics such as good fluidity and narrow particle size distribution;

[0045] 3) preparation of a support for CO2 sequestration: the precursor of a support for the sequestration of CO2 obtained in 2) is pumped to an upper section of a main tower; descending from the upper section of the main tower to the lower cone, the precursor is subjected to the synergistic effect of the heating system and the carbon dioxide distribution system and vitrified, and the carbon dioxide is sucked into the hollow structure of the main tower. The resulting product is subjected to the wind force of the induced draft fan and falls into the first and second recycling units to be cooled and collected, thus obtaining a medium for CO2 sequestration.

[0046] The preparation methods of embodiments 1 to 4 are the same, and the formula and preparation parameters are shown in Table 1: the invention can be realized by the upper and lower limit values ​​and interval values ​​of the proportion of additives, the parameters of the spray granulation process, etc. [Tables 1] First step Second step Third step Fourth step Formula Quartz / kg 1000 976 1052 1036 Borax / kg 234 228 254 238 Calcium oxide / kg 160 180 163 170 Magnesium oxide / kg 177 186 164 178 Sodium carbonate / kg 59.5 61 56 69 Sodium sulfate / kg 4 5 6 3 Sodium phosphate / kg 7 6.5 7.3 6.8 Water / kg 890 914 962 988 Sodium polyacrylate / kg 3 3.2 2.9 3.1 Fluorocarbon surfactant / kg 2.3 2.2 2.4 2.5 Spray granulation Speed / rpm 16500 14000 14500 15000 Inlet temperature / 0 C 285 360 390 425 Export temperature / °C 130 141 148 153 High temperature oven Temperature / °C 750 820 880 900 Carbon dioxy concentration / % 99 99 99 99 Products Particle size (D 10 / D50 / D90 ) / qm 12 / 30 / 45 28 / 45 / 67 18 / 35 / 55 60 / 85 / 12 6 Thermal conductivity / W / (mK) 0.051 0.056 0.060 0.061 Resistance / MPa 2.1 1.7 1.7 1.4 Carbon dioxide concentration / % 96 98 94 95 Main application areas Building materials, coatings, etc.

[0047] It is found that by adjusting the composition of raw materials and processes, the particle size of the carrier for CO2 sequestration can be adjusted. Gas chromatography and TG-FTIR were used to test the internal gas of the sealed carrier, proving that the carbon dioxide concentration reached more than 90%.

[0048] The CO2 sequestration carrier of the invention can encapsulate a large amount of carbon dioxide gas inside the carrier, increase the carbon capture capacity and protect the environment.

[0049] Due to its high porosity and closed hollow structure, the carrier is an excellent container for carbon dioxide storage and can enable large-scale carbon dioxide storage. In addition, the performance of the carrier will not be affected after carbon dioxide storage, and the stored gas is also difficult to leak when used at room temperature and pressure. Therefore, the carrier is of great significance for industrial carbon neutrality.

[0050] The invention makes it possible to create the necessary conditions for the chemical absorption of carbon dioxide through the design of raw material compositions, and to construct a closed-pore structure for the physical storage of carbon dioxide through the design of a preparation process. The integration of physical and chemical storage of carbon dioxide is successfully achieved, and the prepared carbon dioxide carrier has excellent mechanical and insulation properties. thermal, which can be used for secondary use in industrial fields such as construction, plastics and coatings.

[0051] For the invention, the following points must be clarified:

[0052] (1) The drawings which accompany the present invention relate only to the structures related to certain embodiments of the invention, and the other structures may refer to typical designs.

[0053] (2) Without conflict, the embodiments and characteristics of the embodiments embodiments of the invention can be combined with each other to obtain new examples of implementation.

[0054] The above constitutes only specific methods of implementing the invention, but the scope of protection is not limited thereto. The scope of protection of the invention is based on the scope of protection claimed in the claims.

Claims

Claims

1. A medium for CO2 sequestration, comprising the following components in weight percentage: quartz: 30.10 to 40.45%; borax: 8.75 to 14.3%; calcium oxide: 5.13 to 7.20%; magnesium oxide: 5.50 to 7.52%; sodium carbonate: 1.87 to 3.47%; sodium sulfate: 0.12 to 0.53%; sodium phosphate: 0.23 to 0.82%; a stable dispersant: 0.06 to 0.33%; a surfactant: 0.02 to 0.13%; and water: 35 to 45%.

2. The carrier of claim 1, wherein the stable dispersant is sodium polyacrylate, sodium tripolyphosphate, polyethylene glycol or a mixture thereof.

3. The carrier of claim 1, wherein the surfactant is a fluorocarbon surfactant or an organosilicon surfactant.

4. A method for preparing the support for CO2 sequestration according to any one of claims 1 to 3, the method comprising:

1. preparing a slurry; 2. from the slurry, preparing a precursor of a support for CO2 sequestration; and 3. from the precursor of a support for CO2 sequestration, preparing a support for CO2 sequestration.

5. A method according to claim 4, wherein in step 1), the components are weighed, mixed and stirred for 10 to 20 min; the resulting mixture is pumped into a ball mill, to give a slurry with a solids content of 55 to 65% and a particle size less than or equal to 10 qm.

6. A method according to claim 4, wherein in step 2), the slurry prepared in step 1) is pumped and transported to a spray granulation machine; said spray granulation machine operates with an air inlet temperature of 260 to 450°C, an air outlet temperature of 120 to 160°C, and a centrifugal speed of 10000 to 16500 rpm for spray granulation; carbon dioxide is used as the spray gas, and the collected powders are the precursor of a carrier for CO2 sequestration, with a diameter of 1 to 100 pm.

7. A method according to claim 4, wherein in step 3), the precursor of a support for CO2 sequestration obtained in step 2) is pumped to an upper section of a main tower; during its descent from the upper section of the main tower to a lower cone, the precursor is vitrified at high temperature, thus forming the support for CO2 sequestration; the temperature of the main tower is maintained between 600 and 900°C, and simultaneously, a carbon dioxide gas distribution operation is carried out.

8. Device for preparing a support for CO2 sequestration intended to implement the method according to any one of claims 4 to 7, the device comprising an energy-saving high-temperature oven; wherein:

1. The energy-saving high-temperature furnace consists of a main tower; 2. the main tower comprises an upper section; a slurry hopper is connected to the top of the upper section of the main tower via a guide vane; a bottom side of the upper section is connected to a first recycling unit; an upper portion of the first recycling unit is connected to a second recycling unit via a first pipeline, and an upper portion of the second recycling unit is connected to an induced draft fan via a second pipeline; 3. a lower part of the first recycling unit and a lower part of the second recycling unit are respectively connected to a material storage warehouse by pipelines; and

9. 4. a lower section of the main tower is conical, and a bottom of the lower section of the main tower includes a ventilation hole. The device of claim 8, further comprising an outlet duct of a hot air furnace and an exhaust duct; wherein:the outlet duct of the hot air furnace is connected to the guide vane;a first end of the exhaust duct is connected to the guide vane, and a second end is connected to the induced draft fan.

Images