International Journal of Chemical Engineering

International Journal of Chemical Engineering / 2013 / Article

Research Article | Open Access

Volume 2013 |Article ID 297941 |

Thanasit Wongsiriamnuay, Nattakarn Kannang, Nakorn Tippayawong, "Effect of Operating Conditions on Catalytic Gasification of Bamboo in a Fluidized Bed", International Journal of Chemical Engineering, vol. 2013, Article ID 297941, 9 pages, 2013.

Effect of Operating Conditions on Catalytic Gasification of Bamboo in a Fluidized Bed

Academic Editor: Deepak Kunzru
Received19 Mar 2013
Revised03 Jun 2013
Accepted03 Jun 2013
Published19 Jun 2013


Catalytic gasification of bamboo in a laboratory-scale, fluidized bed reactor was investigated. Experiments were performed to determine the effects of reactor temperature (400, 500, and 600°C), gasifying medium (air and air/steam), and catalyst to biomass ratio (0 : 1, 1 : 1, and 1.5 : 1) on product gas composition, H2/CO ratio, carbon conversion efficiency, heating value, and tar conversion. From the results obtained, it was shown that at 400°C with air/steam gasification, maximum hydrogen content of 16.5% v/v, carbon conversion efficiency of 98.5%, and tar conversion of 80% were obtained. The presence of catalyst was found to promote the tar reforming reaction and resulted in improvement of heating value, carbon conversion efficiency, and gas yield due to increases in H2, CO, and CH4. The presence of steam and dolomite had an effect on the increasing of tar conversion.

1. Introduction

Energy demand has been growing for the past several decades due to rapid industrial and urban development in industry, but fossil fuel reserves have been in decline [1]. Renewable energy has been very popular as an obvious candidate to substitute fossil fuels. Biomass is one of the renewable fuel sources that can claim to have significant environmental benefits with regards to neutral carbon emissions and reduction in global warming [2, 3]. There are many biomass materials that can be utilized for energy [4]. Fast growing plants, which do not compete with food crops, may be used as sustainable energy resources [5, 6] for developed and developing countries. Biomass can be converted to biofuels via several pathways such as biochemical or thermochemical conversion. Gasification process is one of the promising technologies to produce syngas from solid feedstock [2, 79]. Producer gas containing simple molecular gas can be used, instead of fossil fuels, in combustion engines.

Gas production is dependent on input streams, operating conditions, and gas output conditioning. Input of gasification process is referred to by type and components of feedstock materials and type and flow of gasifying agent. Gas output conditioning is a process involved in cooling and disposing particulate matter and tar in the gas product. Gasification reactions are controlled by operation conditions such as temperature, pressure, and residence time. Reaction temperature is one of the most influential parameters for the gasification operation. Gasification temperature is normally classified into three ranges; low (400–600°C), medium (600–900°C), and high (>900°C). Increasing temperature tends to result in increasing H2, CO, gas heating value, carbon conversion efficiency, and gas yields. The advantage of gasification at low temperatures is due to reduced energy input, low tar yield [10], and low cost by partial oxidation, but heating value of fuel gas may be low. To increase the heating value of the product gas, steam may be added to the gasifying medium but additional energy input would be needed. This way, the H2 content in the producer gas can be improved. H2 has beneficial properties as a clean energy carrier for heat supply and transportation purposes [2, 8]. Steam gasification takes place at high temperatures because the steam reforming reaction is an endothermic process, but catalytic steam gasification at low temperatures was more useful than high temperature with high content of H2 [10]. Chang et al. [11] found that maximum H2 content occurred at steam to biomass ratio of 1.

Normally, producer gas contains a high content of tar which can cause operational problems by blocking gas cooler, filter elements, and engine components. Most producer gas applications also require the removal of dust and tar before the gas can be used [12]. Tar can be effectively minimized in the producer gas by catalytic cracking. Many researchers have extensively studied and shown that a cheap additive such as calcined dolomite (MgO-CaO) was useful in reducing tar, improving gas quality and heating value for biomass gasification [13, 14]. The destruction of tar is more effective at high temperatures, but increasing temperature may lead to higher tar yield [10]. At low temperature of 550°C, Asadullah et al. [15] reported that, with the presence of dolomite, tar conversion was around 63%. At medium temperature, Yu et al. [13] found that tar conversion of around 65–75% could be achieved at 700°C, with the presence of dolomite. Increasing from 700 to 800°C resulted in a decrease in tar conversion. This was contributed to that fact that more stable compounds of tar were formed, so it was harder to crack. Chiang et al. [16] found that increasing content of CaO and temperature (600–900°C) resulted in an increase of gas heating value and carbon conversion rate. At high temperatures, Akay and Jordan [17] used CaO as an in-bed catalyst in a fixed-bed gasifier at 1,040°C and obtained minimum tar yields of less than 0.8 g/kg and maximum gas yield of 4 Nm3/kg. In addition, the gas produced can be applied into an internal combustion engine and gas burners fixed in the combustion chamber with the downstream process similar to the diesel burner [18].

Many reports exist in the open literature on gasification of various types of biomass, but studies on bamboo are rather limited. Bamboo is one of the fast growing and widely cultivated plants in many countries. It can be harvested within a few years [19]. So far, it has been used mainly as structural material for construction and household furniture [2023]. Its utilization as renewable energy has not yet been investigated extensively. There have been several studies on thermal conversion of bamboo, but most work was about production of activated carbon [2429], or bio-oil via pyrolysis [3035]. Chiang et al. [16] investigated fixed-bed gasification of waste bamboo chopsticks. The heating value was found to be in the range of 2.0–10.6 MJ/m3, obtained between 600–900°C using CaO as a catalyst. Kantarelis et al. [5] used steam as a medium in the gasification of bamboo powder and reported that 10–20% H2 and 15–20% CO can be obtained between 797 and 865 K. Increased steam to biomass ratio resulted in increased H2, CO2, and gas yield, but with reduction in CO, CH4, and heating value. Gasification in a fluidized bed reactor was conducted by Xiao et al. [36] at 400–700°C. The heating value was found to be 7.2 MJ/Nm3 at 700°C with excess air ratio of 0.2. Kannang et al. [37] found that the heating value was 5.26 MJ/Nm3 at 700 K.

There appears to be a lack of information with respect to the gasification of bamboo in a fluidization reactor with the presence of a catalyst, especially at low temperature range. In this study, an experimental study in a fluidized bed reactor was conducted for the gasification of bamboo. The objective of this study was to investigate the effects of reactor temperature, gasifying medium, and catalyst to biomass ratio on composition of product, gas yield, heating value, and carbon conversion efficiency.

2. Materials and Methods

2.1. Biomass Materials and Catalysts

Samples of bamboo collected in Chiang Mai, Thailand, were used. The collected samples were dried, crushed, and ground in a high-speed rotary mill and sieved to provide a feed sample in the size range between 0.10 and 0.25 mm. The moisture, volatile, fixed carbon, and ash were determined, following the ASTM standards. The carbon, hydrogen, and nitrogen contents were determined using a Thermo Scientific Instrument CHN elemental analyzer. The oxygen content was calculated by difference. The heating value of the dried bamboo was determined with a Parr bomb calorimeter. The analysis results of the bamboo samples are shown in Table 1 [37].


Proximate analysis
 Moisture(% w/w)ASTM D 31735.73
 Volatile(% w/w)ASTM D 317574.68
 Fixed carbon(% w/w)ASTM D 317214.04
 Ash(% w/w)ASTM D 31775.55
Ultimate analysis
 Carbon(%)ASTM D 317445.66
 Hydrogen(%)ASTM D 31744.32
 Nitrogen(%)ASTM D 31740.24
 Oxygen(%)By difference49.78
 LHV(MJ/kg)ASTM 586517.80

Silica sand with a particle size of 45 micron was used as inert bed material in the fluidized bed gasifier, while calcined dolomite was used as a catalyst. The dolomite was sieved to obtain a fraction with a particle size of 45 micron and then calcined in the oven at 900°C for 4 h. The calcined dolomite was kept in a desiccator for later use.

2.2. Experimental Apparatus and Procedure

Figure 1 shows a schematic diagram of a fluidized bed gasification system used in this study. There are six main components. Air and steam supply units were composed of air and water supplies, control valves, flow meters, and preheaters. An external heating system supplied heat at the bottom of the fluidized bed reactor. The fluidized bed reactor unit comprised a biomass feeder and a reactor. The reactor was made from a stainless steel cylinder and was externally covered with a thick insulator. The total height of the reactor was 2 m, with an internal diameter of 50 mm. The reactor was installed with a series of thermocouples along the length in order to measure the temperature distribution inside. An air distributor was installed to ensure uniform air distribution. A gas cleaning unit consisted of a series of glass tubes containing isopropanol for gas cleaning and the collection of tar. The gas collecting unit was constituted of a pump, a gas meter, and gas sampling bag. Cold fluidization tests in a transparent tube of the same dimension to the reactor were carried out for these biomass, dolomite, and silica sand particles between 5 and 30 l/min of air flows. It was visually confirmed that proper mixing was achieved at 15 l/min of air flow or higher.

The biomass was fed into the reactor. Air was used as the fluidizing agent and supplied from an air compressor at a constant flow rate of 15 l/min with the equivalent ratio (ER) of about 0.4. Before the air entered the reactor, it was preheated to 300–500°C. When steam was used, it was produced by a steam generator which fed steam to biomass (S/B) ratio of 1 : 1 at 150°C into the reactor. Biomass was continuously fed into the reactor by the screw feeder from the hopper at a constant rate of 10 g/min.

Each run was started by filling the bed with silica sand, with or without dolomite up to the desired catalyst to biomass (C/B) ratio between 0 : 1, 1 : 1, and 1.5 : 1 w/w. The burner was then turned on to provide heat externally. The start-up period was necessary to preheat the bed. After the bed temperature reached the desired level and became steady, the air compressor was turned on to drive the air through the preheater, air distributor, and into the reactor before the commencement of the biomass feeding. The product gas exited the reactor through a cyclone, via gas conditioning unit, and gas sampling system. Char was separated from the producer gas in the cyclone. The produced gas passed through an ice trap for cooling and cleaning. The dry and clean gas was sampled using gas bags and analyzed by gas chromatography. The Shimadzu GC model GC-8A fitted with a Shin-carbon column, and TCD detector was used to detect H2, O2, N2, CH4, CO, and CO. The gas chromatograph was calibrated using standard gases. Helium was used as a carrier gas. Tar was condensed and collected in a series of glass tubes containing isopropanol and it was measured by gravimetric method. The collected tar contained primary and condensed tertiary that dilute in a solvent [38]. Each experimental test’s conditions were repeated at least three times. Average values were subsequently presented with error bar.

From the data collected, lower heating value (LHV) and carbon conversion efficiency (CCE) were calculated from the following equations [39]: where CO, CO2, H2, and CH4 are the concentrations of the gas products, is the gas yield measured from the gas meter, and , C%, and ash are referred to as the biomass feeding rate, carbon, and ash contents in the biomass, respectively.

3. Results and Discussion

3.1. Effects of Temperature and Gasifying Medium

The effects of temperature and gasifying medium on the gas content with nitrogen-free are shown in Figure 2. The reactor temperature was varied between 400 and 600°C. Precision of temperature was about ±20°C for all experiments. Increasing temperature from 400 to 600°C was found to decrease H2 and CO contents by around 1.5–5.6% and 4.2–6.9%, respectively. CO content decreased with increasing temperature due to the endothermic reaction [37], while CO2 increased by around 7.8–8.7% with increasing temperature from 400 to 600°C. CH4 decreased with increasing temperature from 400 to 600°C due to the reaction of steam and CH4 [10].

H2, CO, and CH4 contents in the product gas were higher when an air/steam mixture was used as the gasifying medium. But CO2 content from air gasification was higher than that from air-steam gasification [40]. With air gasification, an increased degree of combustion rate may occur to release more CO2 due to the higher ER (0.4) used in the gasification process. Combustion reactions hardly produce H2 [41]. It was reported that H2 content in product gas was obtained from the dehydrogenation of biomass components and secondary decomposition of their pyrolyzed products (reactions (2) or (3)) [37, 41]:

H2 and CO were decreased at higher temperatures [4] due to the high reactivity of char with air at a higher ER. Increasing temperature favors the endothermic reaction; hence CO content decreased due to a more complete oxidation reaction (reaction (4)) and partial oxidation reaction (reaction (5)) which resulted in increasing CO2 [4]. Skoulou et al. [42] suggested that the reaction of char combustion was composed of absorption and desorption. O2 was absorbed by C which represented carbon active site and released C(O) which was a carbon-oxygen complex in reaction (6). Subsequently, CO2 was released by desorption (reactions (7) and (8)). Oxygen from CO2 was absorbed by char to form C(O) and released CO (reaction (9)). CO was desorbed from surface oxygen complex from reaction (10) and absorbed and reacted with C(O) in reaction (11) and released CO2 [42, 43]:

Figure 3 shows that increasing temperature affected LHV due to the reduction in H2 and CO content [44]. Carbon conversion efficiency was found to increase due to an increase in CO2 content while gas yields remained constant. LHV, carbon conversion efficiency, and gas yield were found to increase when air/steam was used as agent in the gasification process. This was so because higher contents of H2, CO, and CH4 were expected from the water-gas reaction [39].

3.2. Effect of Catalyst to Biomass Ratio

The effects of catalyst on gas compositions with nitrogen-free are shown in Figure 4. It was found that the content of H2 and CO increased, while the content of CH4 and CO2 slightly decreased with increasing temperature and catalyst to biomass ratio [10]. It was reported that tar cracking and tar reforming reactions resulted in increased content of H2 at higher temperatures, according to reactions (12)–(14) [9, 4850]. The content of CO2 increased initially with increasing temperature and then decreased when temperatures were higher than 500°C. With increased catalyst to biomass ratio from 0 to 1.5, higher content of CO2 was obtained due to the release of CO2 from dolomite. At higher temperatures, reforming of tar with CO2 with the presence of dolomite led to a decrease of CO2. The reforming reaction of tar on a dolomite surface occurred by capturing carbon to produce more H2 and CO, according to reaction (14) [50]:

At high temperatures, increase in CO and decrease in CO2 contents were due to reactions (15) and (16). CO2 reacted with excess carbon in char, producing CO (reaction (15)) similar to those previously reported [41, 46]. The reforming of CO2 with tar (reaction (16)) produced CO and H2O. The presence of catalyst promoted the tar reforming reaction, leading to a decrease in tar yield. From Figure 5, it was clear that increasing temperature and catalyst amount resulted in improvement of LHV, carbon conversion efficiency, and gas yield due to the increase in H2, CO, and CH4 contents.

From Figure 6, it was found that tar conversion increased with increasing temperature for all cases. With air-steam gasification, tar conversion was increased from 84 to 92% and 77 to 90% when catalyst to biomass ratio was increased from 1 : 1 to 1.5 : 1, respectively. The trend was similar to those previously reported [13, 15].

3.3. Comparison with the Literature

Table 2 shows producer gas composition, gas ratio and yields, carbon conversion efficiency from different biomass materials, and reactor configurations found from the reported literature. In the comparison of bamboo with other agricultural residues [45, 47], it was found that the H2 content obtained was in similar magnitude, but CO appeared to be higher than other biomass materials. The H2 content obtained from air/steam gasification of bamboo was lower than that from pine sawdust but was in a similar range to those from cellulose and sewage sludge. Regarding the CO content, bamboo was similar to pine sawdust but higher than cellulose and sewage sludge [1, 11, 39, 46]. As far as catalytic gasification was concerned, H2 from bamboo showed a similar magnitude to that from sewage sludge but was lower than pine sawdust [1, 46]. H2/CO was found to be lower than those from the literature. Gas yields and carbon conversion efficiency obtained from bamboo gasification were similar to other biomass materials but higher than cellulose.

RefBiomassC : BS/BAgentER (°C)(% mol)H2/COGas yield
CCE (%)

This work
1 : 1–1 : 1.53.2–9.121.4–31.70.1–0.31.9–2.159.5–80.1
1 : 1Air-steam10.9–16.536.1–40.30.3–0.42.8–2.987.3–98.5
[1]Pine sawdust3%0.75–0.9Air-steam0.22–0.380035.87–40.6722.71–29.881.2–1.791.5–2.3
[45] Rice huskAir0.25–0.35665–11034.0–3.319.9–12.30.20–0.261.3–1.955–81
[46]Sewage sludge10, 15%Air0.3750–8509.9–15.26.1–14.41.05–1.622.5–2.869.9–88.6
10%0.5, 1Air-steam80015.7–16.87.5–9.11.7–2.22.7–2.882.5–83.0
[39]Pine sawdust2.81 : 1Air-steam0.22700–90021.0–38.033.0–43.00.5–1.21.4–2.578.2–92.6
Coir pithAir0.3–0.5400–9005.6–10.66.5–12.70.7–1.01.9–3.2
[47]Rice husk5.3–8.69.3–19.60.4–0.671.8–2.8
Saw dust5.2–10.110.78–16.840.41–0.582.2–3.7

4. Conclusions

In this study, the investigation of low-temperature gasification of bamboo in a fluidized bed reactor has been carried out. The effects of temperature, gasifying medium, and catalyst to biomass ratio on gas composition, LHV, and carbon conversion efficiency of fuel gas were evaluated. The results showed that the content of H2 and CO in the fuel gas decreased with increasing temperature while the content of CO2 increased. Added steam was found to enhance the quality of fuel gas, showing higher contents of H2, CO, and LHV. The presence of a catalyst was found to increase the amount of H2 and CO in fuel gas at higher temperature, whereas the opposite trends were true for CO2.


The authors would like to acknowledge the support from the Thailand Research Fund (Contract no. RSA5080010) and the National Research Council of Thailand. Dr. Suphatz Sukamolson was thanked for assistance in preparing the manuscript.


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Copyright © 2013 Thanasit Wongsiriamnuay et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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