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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 870 Capturing carbon dioxide from air by using Sodium hydroxide (CO2 Trapper) Harshdeep Singh1, Prashant Gupta2, Akshay Soni3, Rohit Joshi4, Ram Jatan Yadav5, Ashutosh Singh6 1,2,3,4 Jims Engineering Management Technical Campus (JEMTEC-affiliated to GGSIPU) Department of Mechanical Engineering, Knowledge park 3, Greater Noida, Uttar Pradesh 5,6Assistant Professor Department of Mechanical Engineering,JIMS Engineering Management Technical Campus, Greater Noida., India.201308 ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Carbon dioxide (CO2) emissionshave becomeone of the most serious issues and this environmental concern is being faced by our civilization today. These emissions are mainly generated from the combustion of coal, oiland natural gas which are the main energy resources in our daily life, economic growth and industrial development. It is widely considered a primary factor in global climate change. In addition, it adversely affects our earth. Switching from fossil fuel would take time and in mean time, emissions will grow to a factor that will take centuries for plants to absorb it. Therefore, we need a solution for this. A possible solution is to capture carbon directly from air same as plants do and store it. This paper presents a way to capture carbon from air by using NaOH. This paper also presents design, materials and cost analysis of prototype created for carbon capturing facility. Reactions and chemicals involved to do so along with experimental data of effectiveness of carbon capturing. Key Words: Air purifier, Carbon Scrubber, Carbon Capture, Direct Air Capture (DAC), Carbon Dioxide Trapper. 1. INTRODUCTION It is well known that CO2 plays a dominating role in the greenhouse gases. Global climate change leads to the high interest in the technologies relevant to the CO2 capturing that is one of the potential methods to reduce greenhouse gas emissions. Carbon dioxide (CO2) emissionshavebecome one of the most serious issues and environmental concerns facing our civilization today. At present evenif westopusing fossil fuels or producing excess co2, we still cannot revert to the present normal state of the earth so we need to remove the excess co2 more rapidly than flora, as trees would require a long time to absorb the present excesscarbonfrom the atmosphere. Trees also require large amount of cultivating land of the earth which could be used for productive purpose. Keeping in mindall thechallengesfaced by humanity this projectwouldhelpovercometheimportant problem of global warming. The amount of carbon dioxide (CO2) in the atmosphere continues to rise and rather rapidly due to unparalleled cumulative CO2 emissions, provoking the undesirable greenhouse gas effect. Certainly, it is becoming critical to develop economical and practical pathways to reduce the CO2 emissions; and appropriately, prospective routes to address this enduring challenge are considered. (i) CO2 emission reduction from post-combustion stationary and mobile sources where CO2 concentration is in the range of 10–15% and (ii) CO2 removal from air called direct air cap0ture (DAC), which is another alternative option to reduce greenhouse gases emissions in a uniform way globally. Although DAC is relatively more challenging than post-combustion capture, it is recognized that it might be practical, provided that suitable adsorbent combining optimum uptake, kinetics, and energetics andCO2 selectivity is available at trace CO2 concentration. Figure 1: Carbon dioxide ppm level over the time 1.1 Literature Review Several methods has been developed and used to capture carbon dioxide from high emission sources and store it in different conditions, someof the featured workthathasbeen done is: Carbon capture and storage (CCS) involves the separation and capture of CO2 from flue gas, or syngas in the case of IGCC. CCS is a three-step process that includes: 1. LiOH absorption solution developed by NASA use same principle but different compound.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 871 2. Capture of CO2 from electric generating units (or other industrial processes); 3. Compressionand transport of the captured CO2 (usuallyin pipelines); 4. Underground injection and geologic sequestration (also referred to as storage) of theCO2 intodeepundergroundrock formations. These formations are often a mile or more beneath the surface and consist of porous rock that holds the CO2. Overlying these formations are impermeable, non- porous layers of rock that trap the CO2 and prevent it from migrating upward. Amine scrubbing: The dominant application forCO2 scrubbing is for removalof CO2 from the exhaust of coal- and gas-fired power plants. Virtually the only technology being seriously evaluated involves the use of various amines, e.g. mono-ethanol-amine. Cold solutions of these organic compounds bind CO2, but the binding is reversed at higher temperatures: CO2 + 2 HOCH2CH2NH2 ↔ HOCH2CH2NH3+ + HOCH2CH2NHCO2− As of 2009, this technology has only been lightly implemented because of capital costs of installing the facility and the operating costs of utilizing it. The following subsections provide an overview of CO2 capture technology, CO2 compression, CO2 pipeline infrastructurefortransportation,geologicsequestration,and alternatives to geologic sequestration. A. CO2 Capture Technology In general, CO2 capture technologies applicable to fossil-fuel fired power generation can be categorized into three approaches: • Post-combustionsystemsaredesignedtoseparateCO2 from the flue gas produced by fossil-fuel combustion in air. • Pre-combustion systems are designed to separate CO2 and H2 in the high-pressure syngas produced at IGCC power plants • Oxy-combustion uses high-purity oxygen (O2), rather than air, to combust coal and therefore produces a highly concentrated CO2 stream. Source: Literature Survey of Carbon Capture Technology - Environmental Protection Agency (EPA) Related work: 1. Gary T. Rochelle (2009). "Amine Scrubbing for CO2 Capture". 2. Li, Jian-Rong (2011). "Carbon dioxide capture- related gas adsorption and separation in metal- organic frameworks" 3. F. S. Zeman; K. S. Lackner (2004). "Capturing carbon dioxide directly from the atmosphere" 2. Experiment Principle of operation CO2 trapper works on the principle ofalkalibasescapacityto absorb carbon dioxide and convert it into carbonate. Reaction of the alkali bases with carbon dioxide: When the alkali solution isafairlyconcentratedone(pH>10), carbon dioxidedirectly reacts withittoformthebicarbonate, which further reactswiththealkalitoformsodiumcarbonate (Na2CO3) as the main product by complete neutralization. Complete Reaction involved and its intermediate states: 1. Carbon dioxide and water react to make carbonic acid. 2. Carbonic acid reacts with hydroxide ions to make bicarbonate ions. Reaction in aqueous solution: Now when carbon dioxide in the air had reacted to form sodium carbonate in the aqueous solution to obtain the absorbent solution (NaOH) back into the system, sodium carbonateis reacted with the calcium hydroxideto get NaOH solution back by the following equation: Setup: We will be using different percentage of NaOH solution for our testing with the prototype made; 1%, 2%, 3% and 5% (w/w) NaOH solution in distilled water. Ambient air with average temperature of 30℃ and normal percentage of carbon dioxide is used for the testing. Air flow inside the chamber is regulated withavoltageregulatorconnectedwith the fan. Solution is sprayed on custom-made filtration structure made to maximize absorption at lowest possible energy input. Nozzles used are made of brass and named “Mist Nozzle”; solution is supplied by using a pump placed outside the filtration box.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 872 Dimensions: Hull or Body: 750 x 300 x 750 (L.B.H mm) Filter Structure: 500 x 300 x 550 (L.B.H mm) Fan : 200mm Diameter (Voltage Regulated) Nozzle : 0.5mm (5 holes) Pump : 5-6 Kg hydraulic pressure (110 psi) Prototype device of above dimensions is taken to runthetest for absorption of CO2. 1. Air is made to flow through the system by use of an fan which extract air out of the system continuouslyandspeedof the fan can be regulated to increase or decrease the flow of air, this air first pass first layer of dry filters. These dry filters do not let dirt particles to enter the chamber and make only clean air to be processed. 2. Air then enters the chamber where custom-made NaOH filter is place. NaOH (aq) solution is sprayed from the top of the chamber; nozzles form mist of aqueous solution giving uniform spreading of solution over the filter. Filter is so designed so that, speed of air is reduced enough to give enough time for reaction to occur. The design of filter is such that air must pass aqueous solution layers of NaOH, hence improving reaction and surface area for better efficiency. 3. Passing from NaOH solution filter most of the carbon dioxideisabsorbed and remaining air is exhausted out ofthe chamber via voltage-regulated fan. 4. After absorption of CO2, solution becomes rich in Na2CO3. This solution is taken to react with Ca(OH)2 to form CaCO3 and NaOH, hence giving back the main working chemical (NaOH). CaCO3 being solid is easy to remove from the aqueous solution. We used 3, 4, 5% (w/w)solutionofNaOHwithdistilledwater to conduct the experiment. 2.1 Components and Working Figure 2: Main body Figure 3: Main body cut section
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 873 Figure 4: Carbon Dioxide filter (Top View) Table -1: Key Points of the components Preparation of Manuscript S. No Component Feature Material used 1. Main Body (Outer shell) Water proof and High strength G.I. (22 Gauge) (Painted inside with plastic paint) 2. Dust Filter Prevents dust from entering main reaction area HDPE or PVC fine mesh filter 3. Chemical Carbon Filter Shape of structure slows down air speed and promotes reaction with NaOH for better absorption, Chemical safe material PVC pipes and HDPE filter Sheets 4. Nozzle (3 Units) Misting nozzles spray solution all over the filter uniformly Brass or PVC 5. Connecting pipes Transports the solution from one compartment to other PVC or PU 6. Sodium Carbonate drip storage It collects the dripping solution from the filter and stores it until transported to other chamber HDPE , PVC , PU 7. Fan Voltage regulated speed control Plastic 8. Chemical storage compartment It stores both NaOH and Ca(OH)2, leak proof, high strength HDPE, PVC, Polypropylene or Poly Urethane 9. Pump Circulates solution with high pressure for nozzles to work __
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 874 Figure 5: Working of prototype systematically 1. Ambient air enters through the dust filter (air temp – 30℃ at 1atm); all the dust and macro impurity are filtered here 2. Now air moves to the chemical carbon filter where NaOH is spraying and structure is such made that air moves slowly while making contact with walls of NaOH solution and crosses HDPE filters many times which increase the chance of Carbon to be reacted with NaOH. In this process CarbonDioxidefromairget filtered out as it reacts with NaOH to form Na2CO3 (Sodium carbonate) and makes air free from Carbon Dioxide. 3. This air free from Carbon exits out of the body via exhaust fan. 4. Sodium carbonate that is made is collected at the bottom of the carbon filter and taken to chemical storage area where Na2CO3 is made to react with Calcium Hydroxide (Ca(OH)2) to form NaOH which is again used in the reaction and Calcium Carbonate which is easy to separate out. 5. NaOH obtained is recirculate repeatedly to filter out Carbon Dioxide. 3. Results These experiment results are obtained from 100% carbon dioxide gas fed to the reaction chamber just for testing the correct working of the project. The removal efficiency of CO2 as a function of operating temperature is shown in Chart 1 with the inlet CO2 concentration of 4%. As observed in the chart 1, with increasing the operating temperature, the reaction rate increases resulting in enhancement of the CO2 removal efficiency. Chart 1 shows that the maximum removal efficiency of 63% is related to100 °C with 3 wt. % of aqueous NaOH for the rate of 0.063 lit/s. Moreover, the sharp change in the green line shown in Chart 1 returns to the accuracy of the CO2 analyser as well as higher reaction rate. In order to evaluate the influence of the absorbent concentration, two different aqueous solution of NaOH with the values of 3 and 1 wt. % is used and the results are depicted in Chart 2. As can be seen, increasing the absorbent concentration from 1 to 3 wt. % leads to an enhancement in removal efficiency due to providing higher driving force to the reaction. As the concentration of absorbent is increased, the rate of reaction will also be favoured due to providing higher concentration of the reactant. These results are obtained from infrared CO2 sensor, air was heated from a rapid air heater just for testing purposes. Source of this result is Reference [1]: “A novel rate of the reaction between NaOH with CO2 at low temperature in spray dryer” byYadollahTavanandSeyyedHosseinHosseini. Chart 1: Plot for different temperature of air
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 875 Chart 2: Plot for different concentration of NaOH Cost Analysis Cost analysis of components that are used in this system are as follows: 1. Initial cost of body : 12,000 to 16,000 rupees 2. Cost of chemicals : NaOH : 8200 rupees / Ton (One time) Ca(OH)2 : 4000 rupees / Ton *(Reoccurring Cost) 3. Cost of Energy: It consumes about 40W – 70W energy depending upon pump (This energy can be free if solar energy panel is used and results in no carbon emissions) 3. CONCLUSIONS In practical application of the project ambient temperature of air would be around 30 – 40 ℃ considering weather conditions in India, ambient air also holds about 0.04% of carbon dioxide hence actual efficiency would certainly be lowered than ideal 100% carbon rich air. Conducting experimentsalongwiththestructuremadebyus actual efficiency of carbon removal varied between30-60%. Carbon removal efficiency grows with increase in temperature and concentration of carbon dioxide in air passing through this filter hence it can be ideal to use in capturing carbon from carbon rich emission sources. It is ideal for use in: Power plant emission control Oil refinery and oil extraction emissions control Fossil fuel powered objects like automobiles, etc. This can also be used for DAC Direct Air Capture, i.e. capturing carbon from ambient air itself. REFERENCES [1] “A novel rate of the reaction between NaOH with CO2 at low temperature in spray dryer” by Yadollah Tavan and Seyyed Hossein Hosseini. [2] Literature Survey of Carbon Capture Technology - Environmental Protection Agency (EPA) [3] “The Carbon Cycle” by Holli Riebeek, Design by Robert Simmo June 16, 2011 NASA https://earthobservatory.nasa.gov/Features/CarbonCyc le/ [4] Willis, Richard; Lesch, David A. (2010). "Carbon Dioxide Removal from Flue Gas Using Microporous Metal Organic Frameworks [5] Gary T. Rochelle (2009). "Amine Scrubbing for CO2 Capture". [6] Li, Jian-Rong (2011). "Carbon dioxide capture-related gas adsorption and separation in metal-organic frameworks" [7] F. S. Zeman; K. S. Lackner (2004). "Capturing carbon dioxide directly from the atmosphere" [8] M. Wang, A. Lawal, P. Stephenson,J.Sidders,C.Ramshaw “Post-combustion CO2 capture with chemical absorption: a state-of-the-art review” [9] M.H. Al-Marzouqi, M.H. El-Naas, S.A.M. Marzouk, M.A. Al- Zarooni, N. Abdullatif, R. Faiz “Modeling of CO2 absorption in membrane contractors” [10] J.M. Amann, M. Kanniche, C. Bouallou “Natural gas combined cycle power plant modified into an O2/CO2 cycle for CO2 capture” [11] J. Davison “Performance and costs of power plants with capture and storage of CO2” [12] Y. Tavan, S.H. Hosseini “A novel application of reactive absorption to break theCO2 –ethaneazeotrope withlow energy requirement” [13] E. Worrell, L. Price, N. Martin Energy efficiency and carbon dioxide emissions reductionopportunitiesinthe US iron and steel sector [14] J.-C. Chen, G.-C. Fang, J.-T. Tang, L.-P. Liu “Removal of carbon dioxide by a spray dryer” [15] S.-M. Shih, C.-S. Ho, Y.-S. Song, J.-P. Lin “Kinetics of the reaction of Ca(OH)2 with CO2 at low temperature”
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 876 [16] “Carbon Dioxide Capture from Atmospheric Air Using Sodium Hydroxide Spray” Joshuah K. Stolaroff§, David W. Keith‡ and Gregory V. Lowry [17] Microporous metal-organic framework with potential for carbon dioxide capture at ambient conditions: by Shengchang Xiang, Yabing He, Zhangjing Zhang,HuiWu, Wei Zhou, Rajamani Krishna & Banglin Chen [18] Quadrelli, R. & Peterson, S. The energy-climate challenge: recent trends in CO2 emissions from fuel combustion. Energ. [19] Rochelle, G. T. Amine scrubbing for CO2 capture. [20] Haszeldine, R. S. Carbon capture and storage:howgreen can black be? [21] D'Alessandro, D. M., Smit, B. & Long, J. R. Carbon dioxide capture: prospects for new materials. Angew. Chem.Int. [22] Drage, T. C. et al. Materials challenges for the development of solid sorbents for post-combustion carbon capture.
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