The Effects of Methanol on Honehe Lignite Pyrolysis

2013 ◽  
Vol 291-294 ◽  
pp. 748-754
Author(s):  
De Min He ◽  
Jun Guan ◽  
Lin Zhang ◽  
Qiu Min Zhang
Keyword(s):  
Flow Rate ◽  
Functional Group ◽  
Coal Tar ◽  
Fixed Bed ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Oxygen Functional Group ◽  
N2 Atmosphere ◽  
N2 Flow Rate

In this paper, the pyrolysis of Honehe Lignite in N2 and N2-Methanol atmospheres were investigated on a fixed-bed reactor. The methanol flow rate, pressure, temperature and holding time were studied. The maximum of coal tar yields 12.01% (with methanol injected in) and 9.61% (absence of methanol) were achieved on the conditions of 520°C, 0.5MPa, N2 flow rate 50ml/min, methanol flow rate 0.1ml/min and holding time 20min, and the relative growing rate was about 25.0%. The gas from coal pyrolysis was detected by GC, and the coal tar was reprocessed and then detected by GC-MS. While the solid char was detected by IR to study the change of oxygen functional group during coal pyrolysis in N2-Methanol atmosphere. Compared with that pyrolysis in N2 atmosphere, the components, characteristics and properties of coal tar, gas and solid char varied a lot. The results showed that the injection of methanol into the system changed the products yields and distribution. The results showed that the total yields of phenol, cresol and xylenol (short for PCX) in the Acidic were about 1.93% and 1.15% (daf) in two atmospheres respectively, the PCX yields with methanol injected was about 1.67 times higher than that absence of methanol.

The Comparative Study of Honghe Lignite Pyrolysis under the Atmosphere of Methanol and Nitrogen

2012 ◽  
Vol 512-515 ◽  
pp. 1784-1789 ◽  
Author(s):  
De Min He ◽  
Lin Zhang ◽  
Jun Guan ◽  
Qiu Min Zhang
Keyword(s):  
Flow Rate ◽  
Coal Tar ◽  
Fixed Bed ◽  
Sulfur Removal ◽  
Nitrogen Atmosphere ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Nitrogen Flow Rate ◽  
Liquid Yield ◽  
The Comparative Study

The pyrolysis of Honghe lignite was investigated on low heating rate (about 20°C/min) conditions in a fixed bed reactor with 10g fed in. Nitrogen was used as carrier gas operating at the range from 50 to 200ml/min. And, the temperature was tested from 440 to 560°C, the pressure ranges from 0.1MPa to 1.2MPa. The yields of coal tar, char, water and gas were obtained in experiments. The maximum coal tar yield of 9.77% (dry coal) was achieved at 520°C, 50ml/min nitrogen flow rate, pressure 0.4MPa and 20 minutes holding time. Then methanol was injected in the system at the preheat temperature 240°C(a little higher than its critical temperature). The methanol flow rate, pressure and holding time were also taken into consideration. And the results were compared with those obtained in pyrolysis under nitrogen atmosphere. It showed that higher liquid yield with lower yields of char, gas and loss were obtained with the presence of methanol, but the differences of char yields were slight. The total sulfur removal for methanol presence is considerably higher than the absence of methanol in pyrolysis. Considering the mild conditions of the pyrolysis with presence of methanol, this method may be an appropriate way to make use of the lignite efficiently and environmentally.

Study on Brown Coal Pyrolysis

2012 ◽  
Vol 524-527 ◽  
pp. 894-897
Author(s):  
Gang Wei Zhao ◽  
Yun Han Xiao
Keyword(s):  
Brown Coal ◽  
Coal Tar ◽  
Fixed Bed ◽  
New Method ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Reaction Condition ◽  
Combustion Processes

It is very important to the combustion processes of coal pyrolysis, so the effects of all reaction condition on the brown coal (Yunnan,China) were investigated by using the fixed bed reactor in detail. Through the new method of part-hydrogenation of the pyrolysis, it can be increased the content of coal tar at the same time reduced H2consumption.

scholarly journals Modeling of fixed bed reactor for coal tar hydrogenation via the kinetic lumping approach

2018 ◽  
Vol 1 (3) ◽  
pp. 279-283 ◽  
Author(s):  
Fei Dai ◽  
Yalin Zhang ◽  
Endong Xia ◽  
Zhanquan Zhang ◽  
Zhihua Zhang ◽  
...  
Keyword(s):  
Coal Tar ◽  
Fixed Bed ◽  
Fixed Bed Reactor

Experimental Study of the Reforming of Methane with Carbon Dioxide over Coal Char

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Yanbing Li ◽  
Rui Xiao ◽  
Baosheng Jin ◽  
Huiyan Zhang
Keyword(s):  
Carbon Dioxide ◽  
Flow Rate ◽  
Fixed Bed ◽  
Coke Oven ◽  
Fixed Bed Reactor ◽  
Internal Diameter ◽  
Generation System ◽  
Coke Oven Gas ◽  
Surface Areas ◽  
Conversion Of Methane

As one of the fundamental issues of the new poly-generation system on the basis of gasification gas and coke oven gas, carbon dioxide reforming of methane experiments have been performed over coal chars derived from different parent coals in a lab-scale fixed-bed reactor (internal diameter 12 mm, length 700 mm). The char derived from TongChuan coal exhibited higher activity than other samples employed under the same conditions. After the reforming reaction, the char samples were covered with different amounts of carbon deposition which resulted in the surface areas decrease. As the flow rate of feed gas increased from 200 ml/min to 600 ml/min over the Xuzhou char sample at 1050 degrees Celsius, the conversion of methane decreased from 52.7% to 17.5% and the H2 /CO dropped from 0.75 to 0.55. While maintaining the flow rate of CO2 at 20ml/min at 1050 degrees Celsius, the mole ratio of reactants CH4/CO2 was varied from 1 to 1.75 which led to the H2/CO ratio increase from 0.75 to 1.2.

scholarly journals Dynamic Simulation of Adiabatic Catalytic Fixed-Bed Tubular Reactors: A Simple Approximate Modeling Approach

2014 ◽  
Vol 14 (1) ◽  
pp. 25
Author(s):  
Wiwut Tanthapanichakoon ◽  
Shinichi Koda ◽  
Burin Khemthong
Keyword(s):  
Dynamic Model ◽  
Dynamic Behavior ◽  
Dynamic Simulation ◽  
Flow Rate ◽  
Fixed Bed ◽  
Axial Dispersion ◽  
Fixed Bed Reactor ◽  
Inlet Temperature ◽  
Acetylene Hydrogenation ◽  
Tubular Reactors

Fixed-bed tubular reactors are used widely in chemical process industries, for example, selective hydrogenation of acetylene to ethylene in a naphtha cracking plant. A dynamic model is required when the effect of large fluctuations with time in influent stream (temperature, pressure, flow rate, and/or composition) on the reactor performance is to be investigated or automatically controlled. To predict approximate dynamic behavior of adiabatic selective acetylene hydrogenation reactors, we proposed a simple 1-dimensional model based on residence time distribution (RTD) effect to represent the cases of plug flow without/with axial dispersion. By modeling the nonideal flow regimes as a number of CSTRs (completely stirred tank reactors) in series to give not only equivalent RTD effect but also theoretically the same dynamic behavior in the case of isothermal first-order reactions, the obtained simple dynamic model consists of a set of nonlinear ODEs (ordinary differential equations), which can simultaneously be integrated using Excel VBA (Visual BASIC Applications) and 4th-order Runge-Kutta algorithm. The effects of reactor inlet temperature, axial dispersion, and flow rate deviation on the dynamic behavior of the system were investigated. In addition, comparison of the simulated effects of flow rate deviation was made between two industrial-size reactors.Keywords: Dynamic simulation, 1-D model, Adiabatic reactor, Acetylene hydrogenation, Fixed-bed reactor, Axial dispersion effect

scholarly journals The Effect of pyrolysis conditions to produce levoglucosan from rice straw

2018 ◽  
Vol 67 ◽  
pp. 03026
Author(s):  
Aji Satria Nugraha ◽  
Setiadi ◽  
Tania Surya Utami
Keyword(s):  
Rice Straw ◽  
Maximum Yield ◽  
Fixed Bed ◽  
Intermediate Compound ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Industrial Sectors ◽  
Bio Oil ◽  
Cellulose Component ◽  
Derivative Products

The industrial sectors that produce synthetic chemicals and and polymers rely heavily on fossil resources. Rice straw is very abundant in Indonesia and can be used as a substitute for fossil resources to produce petrochemical precursors. It is known that cellulose component is the main source for LG formation. Due to high contain of cellulose, the potential of rice straw can be transform by pyrolysis to produce bio-oils and derivative products towards levoglucosan (LG) should be developed. Levoglucosan is an important intermediate compound as it can be convert to the precursor of bio-polymer adipic acid, bio-ethanol, etc. Nowadays it’s still rarely research focused on this mechanism route producing LG through pyrolysis. LG then can run into a further reaction and produce derivative products. In order to obtain the highest yield of LG in bio-oil, a condition that may inhibit the further reaction of LG during pyrolysis takes place. The factor of biomass source and composition, temperature, and holding time (adjusted by N2 feed) most likely greatly affect the product composition formed at the end of pyrolysis. In this study, fast-pyrolysis of rice straw was performed in fixed-bed reactor (5 grams of biomass) under different temperature ranges (450 to 600 °C), N2 flow rate (1200 to 1582 ml/min) to maximize the yield of LG. The content of LG on bio-oil was measured by GC-MS instrument. The maximum yield of LG (67.78% of area) was obtained at an optimal temperature of 500°C with holding time of 1.35 s.

Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor

2017 ◽  
Vol 25 (4) ◽  
pp. 507-515 ◽  
Author(s):  
Shuai Cheng ◽  
Dengguo Lai ◽  
Zhen Shi ◽  
Leisheng Hong ◽  
Jianling Zhang ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Secondary Reactions

scholarly journals The Effects of Holding Time and the Sweeping Nitrogen Gas Flowrates on the Pyrolysis of EFB using a Fixed–Bed Reactor

2013 ◽  
Vol 53 ◽  
pp. 185-191 ◽  
Author(s):  
Alina Rahayu Mohamed ◽  
Zainab Hamzah ◽  
Mohamed Zulkali Mohamed Daud ◽  
Zarina Zakaria
Keyword(s):  
Fixed Bed ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Nitrogen Gas
Sign in / Sign up

Export Citation Format

Share Document