APPLICATION OF THE BIOMASS PYROLISIS PRODUCTS AS A REBURNING FUEL FOR NITROGEN OXIDES REDUCTION: TESTING THE CHEMICAL KINETICS MECHANISM

The mechanisms of chemical kinetics of the Reburning process using pyrolysis gases as a reburn fuel are determined. It has been shown that CO, CO2, H2 have very little effect on the reduction of the nitrogen oxides under conditions characteristic for the coal combustion, and hydrocarbons play the major contribution to the reduction of the nitrogen oxides. The results of the test calculations showed that the process of the nitrogen oxides reduction by the biomass pyrolysis products can be calculated by a simplified mechanism of the chemical kinetics of the Reburning process by replacing hydrocarbons with one substance (with a close carbon/hydrogen ratio as in the real pyrolysis gas mixture), provided that the mass fraction of carbon is preserved, fed to the reduction of nitrogen oxides unchanged. This approach significantly reduces machine time and calculates the nitrogen oxides reducing efficiency by Reburning technology with an accuracy of 17%.

Download Full-text

USE OF THE REBURNING TECHNOLOGY WITH BIOMASS PYROLYSIS PRODUCTS AS A REBURNING FUEL TO REDUCE EMISSIONS OF NITROGEN OXIDES FROM TPP 312 BOILER

Thermophysics and Thermal Power Engineering ◽

10.31472/ttpe.1.2021.10 ◽

2021 ◽

Vol 43 (1) ◽

pp. 82-88

Author(s):

S.G. Kobzar ◽

A.A. Khalatov

Keyword(s):

Natural Gas ◽

Nitrogen Oxides ◽

Coal Combustion ◽

High Price ◽

Design Parameters ◽

Combustion System ◽

Biomass Pyrolysis ◽

Boiler Load ◽

Pyrolysis Products ◽

Reduce Emissions

In Ukraine, a three-stage coal combustion system fueled by a natural gas as a reburning fuel for nitrogen oxides emission reduction was mounted on Unit № 4 of the Ladyzhyn TPP. This system was developed in cooperation with Combustion Engineering (USA), VTI (Russia) and the Gas Institute of the National Academy of Sciences of Ukraine and was assembled by the Ladyzhyn TPP staff in 1992. The test runs of this system had confirmed the effectiveness of this method of reducing emissions of nitrogen oxides into the atmosphere (up to 50%).Unfortunately, due to the high price of natural gas and the introduction of limits on its use, currently the use of natural gas as a fuel for reburning is impossible. One of the possible ways to reduce emissions of nitrogen oxides from the coal-fired boiler TPP 312 is the operation of Reburning technology with the biomass pyrolysis product as reburning fuel. The aim of the work was to evaluate the possibility of the application the biomass pyrolysis products as a reburning fuel in Reburning technology to reduce nitrogen oxides from the coal-fired boiler TPP 312. For this purpose, a detailed computer model of a standard TPP 312 boiler and a TPP 312 boiler with a coal reburning combustion system was developed and built. The study of the operation the Reburning coal combustion system, which is mounted on the unit №4 DTEK Ladyzhynska TPP, on the design parameters of the operation for the boiler load of 280 MWe was carried out. It was determinate that the supply of reburning fuel at 12% of the total heat capacity of the boiler gives a good level of the reduction of nitrogen oxides (up to 25%), provides no slag conditions for superheater pipes and does not lead to increase of the fuel losses with unburnt carbon.

Download Full-text

THE INVESTIGATION OF THE EFFICIENCY OF THE NITROGEN OXIDES REDUCTION BY ADVANCED REBURNING METHOD APPLICATION WITH THE COAL DUST AS A REBURNING FUEL

Industrial Heat Engineering ◽

10.31472/ihe.5.2017.15 ◽

2017 ◽

Vol 39 (5) ◽

pp. 91-96 ◽

Cited By ~ 1

Author(s):

S. G. Kobzar ◽

A. A. Khalatov

Keyword(s):

Nitrogen Oxides ◽

Coal Combustion ◽

Catalytic Reduction ◽

Coal Dust ◽

Single Stage ◽

Nitrogen Oxides Reduction

The investigation of the influence of the low reactivity reburning fuel coal dust on the simultaneous processes of the nitrogen oxides reduction in accordance with the mechanisms Reburning and selective non-catalytic reduction was carried out. The study showed the possibility to reduce the nitrogen oxides emissions up to 80 % compared with single-stage coal combustion.

Download Full-text

Optimization of Chemical Kinetics for Methane and Biomass Pyrolysis Products in Moderate or Intense Low-Oxygen Dilution Combustion

Energy & Fuels ◽

10.1021/acs.energyfuels.8b01022 ◽

2018 ◽

Vol 32 (10) ◽

pp. 10194-10201 ◽

Cited By ~ 7

Author(s):

Magnus Fürst ◽

Pino Sabia ◽

Marco Lubrano Lavadera ◽

Gianmarco Aversano ◽

Mara de Joannon ◽

...

Keyword(s):

Chemical Kinetics ◽

Biomass Pyrolysis ◽

Low Oxygen ◽

Pyrolysis Products

Download Full-text

Study on the Mechanism of Gas Component Release for Biomass Pyrolysis

E3S Web of Conferences ◽

10.1051/e3sconf/201911803058 ◽

2019 ◽

Vol 118 ◽

pp. 03058

Author(s):

Hongtao Li ◽

Li Wang ◽

Yunguang Ji ◽

Shuqi Xue ◽

Zhenhui Wang

Keyword(s):

Biomass Energy ◽

Energy Utilization ◽

Thermochemical Conversion ◽

Release Mechanism ◽

Correction Coefficient ◽

Superposition Method ◽

Biomass Pyrolysis ◽

Yield Model ◽

Pyrolysis Gas ◽

Pyrolysis Products

Biomass energy utilization can solve the contradiction between economic development and energy and environment. Biomass pyrolysis technology is not only one of the thermochemical conversion technologies, but also the necessary stage of biomass gasification, which has become a hot academic research topic. Firstly, based on the pyrolysis experimental data of cellulose, hemicellulose and lignin, the analytical expressions of pyrolysis gas mass yields of different biomass components varying with temperature were obtained; then, the prediction of pyrolysis products was obtained by mass component superposition method, and the correction coefficient of biomass pyrolysis gas yield model was obtained based on the comparison between the average yield of biomass pyrolysis gas and the predicted value of pyrolysis products; finally, the gas release mechanism model of biomass pyrolysis was obtained. This study provides theoretical basis and technical support for the development of biomass utilization technology.

Download Full-text

Analysis of Chemical Kinetics of the Trade-off between Soot and Nitrogen Oxides in Diesel Combustion(Thermal Engineering)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.76.772_2280 ◽

2010 ◽

Vol 76 (772) ◽

pp. 2280-2285

Author(s):

Tie LI ◽

Hideyuki OGAWA

Keyword(s):

Nitrogen Oxides ◽

Chemical Kinetics ◽

Thermal Engineering ◽

Diesel Combustion ◽

Trade Off ◽

Kinetics Of

Download Full-text

Differential kinetics of nitrogen oxides reduction leads to elevated nitrous oxide production by a nitrite fed granular denitrifying EBPR bioreactor

Environmental Science Water Research & Technology ◽

10.1039/c9ew00881k ◽

2020 ◽

Vol 6 (4) ◽

pp. 1028-1043 ◽

Cited By ~ 1

Author(s):

Han Gao ◽

Xiaotian Zhao ◽

Lei Zhou ◽

Fabrizio Sabba ◽

George F. Wells

Keyword(s):

Nitrous Oxide ◽

Nitrogen Oxides ◽

Greenhouse Gas ◽

P Uptake ◽

Oxide Production ◽

Slow Kinetics ◽

Nitrous Oxide Production ◽

Nitrogen Oxides Reduction ◽

Kinetics Of

Batch kinetic assays of DPAO-enriched biomass reveal elevated kinetics when nitrite is supplied for P uptake, but extremely slow kinetics for reduction of the potent greenhouse gas nitrous oxide.

Download Full-text

Structure and chemical kinetics of flames supported by nitrogen oxides

Pure and Applied Chemistry ◽

10.1351/pac199365020277 ◽

1993 ◽

Vol 65 (2) ◽

pp. 277-283 ◽

Cited By ~ 4

Author(s):

M. C. Branch ◽

J. J. Cor

Keyword(s):

Nitrogen Oxides ◽

Chemical Kinetics ◽

Kinetics Of

Download Full-text

Mathematical Modelling of Pyrolysis of Hardwood (Acacia)

Acta Technologica Agriculturae ◽

10.2478/ata-2020-0028 ◽

2020 ◽

Vol 23 (4) ◽

pp. 176-182

Author(s):

Alok Dhaundiyal ◽

Suraj B. Singh ◽

Istvan Bacskai

Keyword(s):

Mass Fraction ◽

Fixed Bed ◽

Temperature Sensors ◽

Solid Mass ◽

Biomass Pyrolysis ◽

Proposed Model ◽

Physical Attributes ◽

Pyrolysis Reactor ◽

The Relationship ◽

Kinetics Of

AbstractThis paper emphasises the analogous modelling of hardwood (acacia) pyrolysis. The impacts of physical characteristics of hardwood chips on the pyrolysis are examined through the conservation of biomass solid mass fraction. The ONORM standard chips of sizes ‘G30’ and ‘G50’ and their combination are individually tested in the pyrolysis reactor. In the analogous situation, the fixed bed is assumed to be a wooden slab with a porosity equivalent to the voidage of bed. Bulk density, bed length and porosity are several of the physical attributes of a fixed bed used to examine the variation in the hardwood solid mass across the fixed bed. To measure temperature, the four-temperature sensors separated from each other by 80 mm are fixed along periphery of a reactor. The heating element of 2 kWe is provided to initiate the biomass pyrolysis. The proposed model is also used to establish the relationship between the kinetics of pyrolysis and the structural properties of hardwood.

Download Full-text