Method for determining content of coal pyrolysis resultant
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A coal pyrolysis and product technology, applied in the direction of removing a certain component and weighing, can solve the problems of high cost, high measurement cost, and complicated measurement of pyrolysis components.
Active Publication Date: 2015-12-16
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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[0003] In order to determine the amount and rate of volatile matter precipitation, thermogravimetric analysis is usually used to test the weight loss and weight loss rate of coal at different heating rates and pyrolysis temperatures; the measurement of pyrolysis components is more complicated and costly; The combination of solution model and experimental data is a more effective research method; in order to predict the composition of coal pyrolysis products, the literature [Apredictivemulti-stepkineticmodelofcoaldevolatilization[J].Fuel, 2010, 89(2): 318-328] believes that coal is Composed of mixed functional groups, these functional groups produce specific types of gases with different kinetic parameters, and it is proposed that during the pyrolysis process, a multi-step kinetic method is used to determine the composi
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Embodiment 1
[0054] The gas produced by coal pyrolysis mainly contains CH 4 、C 2 h 6 , CO, CO 2 、H 2 O, H 2 , and some traces of polycyclic aromatic hydrocarbons PAHs (PolynuclearAromaticHydrocarbons) and nitrogen organic compounds NH 3 , HCN, etc., the content of nitrogen and sulfur in coal is relatively low, for example, the content of nitrogen is about 1%, here it is simplified to think that all nitrogen and sulfur remain in coal char, and the trace PAHs in pyrolysis gas are ignored; therefore, as 100g of dry ash-free base coal is used as a benchmark, and when the volatile matter is measured by an industrial analysis method, the pyrolysis equation expresses:
[0055]
[0056] Dry ash-free content is indicated by the subscript "daf".
[0057] The coefficient on the right-hand side of equation (1) represents the number of moles; CH x5 Indicates methane CH 4 , ethane C 2 h 6 , propane C 3 h 8 and vinyl C 2 h 4 A mixture of small molecule hydrocarbons, such as CH x5 It is ...
Embodiment 2
[0087] The detailed steps to determine the composition of coal pyrolysis products are as follows:
[0088] (1) For the actual coal used in a certain power plant, the samples were sent to the laboratory for laboratory analysis, and obtained by elemental analysis
[0089] m C =86.80
[0090] m H =4.52
[0091] m O =6.28
[0092] m N =1.35
[0093] m S =1.05
[0094] obtained through industrial analysis
[0095] m FC =81.58
[0096] m V =18.42
[0097] Q net,daf =33922.2kJ / kg
[0098] (2) Calculated according to formulas (2), (3), (4), (11), and (12)
[0099] b=0.0484
[0100] c=0.0328
[0101] a=6.5977
[0102] m A =1131.39
[0103] m'=911.28;
[0104] (3) m' C , m' H , m' O , m' V , m' A , Q′ net,daf The calculation algebra formulas are as follows:
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Abstract
The invention discloses a method for determining content of coal pyrolysis resultant. The method comprises (1) obtaining the mass of C, H, O, N and S in 100 g dry ash-free basis coal by employing an element analysis process and respectively recording as mC, mH, mO, mN and mS g, and employing a coal industrial analysis process to measure the caloric value Q[net ,dnf] of combustible substances in dry ash-free basis coal and measure the mass of coke and volatile compounds generated after pyrolysis respectively to be mFC and mV g; (2) calculating the air quantity demanded by combustion of 100 g dry ash-free basis coal to be mA g according to a combustion chemical formula; (3) obtaining the value of a, b and c from a coal pyrolysis formula (1) according to the data in the step (1) by balancing the mole numbers of N and S elements, thereby respectively determining the substance amount of C, N and S elements in coal, and calculating x[i] values according to a formula (14) by employing a process of solving a minimum value of a function, thereby determining the content of H2O, CO, CO2, a hydrocarbon mixture and H2.
Description
technical field [0001] The invention belongs to the field of thermal energy engineering, and in particular relates to a method for determining the composition content of coal pyrolysis products. Background technique [0002] The combustion of pulverized coal has to go through stages such as pyrolysis of organic matter, combustion of volatile matter, and heterogeneous reaction of coal char. Pyrolysis is the first step of pulverized coal combustion, and the mass of volatile matter precipitated in this process accounts for about 10% to 50% of the mass of raw coal; Volatile matter is coupled with the combustion process of coke. Due to the influence of volatile matter flame, coal char particles can be ignited below its ignition temperature, and volatile matter has both combustion-promoting and "oxygen-grabbing" effects on coke; The nitrogen oxides produced by partial combustion are related to factors such as reaction temperature, coal quality characteristics, and gas composition;...
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IPC IPC(8): G01N5/04
Inventor 刘福国崔福兴姜波周新刚
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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