Road Concrete Containing Coal Ashes of Thermal Power Stations Located in Krasnoyarsk

2020 ◽  
Vol 839 ◽  
pp. 160-165
Author(s):  
Galina V. Vasilovskaya ◽  
Maria L. Berseneva ◽  
Alexandra A. Yakshina ◽  
Vadim V. Servatinsky ◽  
Igor Ya. Bogdanov
Keyword(s):  
Fly Ash ◽  
Calcium Oxide ◽  
Thermal Power ◽  
Free Calcium ◽  
Power Station ◽  
Disposal Area ◽  
Power Stations ◽  
Thermal Power Stations ◽  
Concrete Mix ◽  
Ash Disposal

The paper reports on outcomes of research into a road concrete containing coal ash powders of thermal power stations located in Krasnoyarsk. The study was focused on characteristics of a fly ash, and ash taken in an ash-disposal area of Krasnoyarsk Thermal Power Station 1, as well as ash of Beryozovskaya GRES. To compare characteristics a standard limestone powder was used. Physical and mechanical characteristics, chemical and mineral composition of these powders were analyzed. Mineral powders differed in a concentration of free calcium oxide (СаОfr.). Samples of a fine-grained road concrete were composed and prepared using materials above. Physical and mechanical properties of formed road concrete samples were tested. A coefficient K was introduced to assess the relation between key characteristics of a road concrete mix and concentration of free calcium oxide, furthermore, it considers a percentage of СаОfr. in ash (m) and percentage of this ash in a road concrete (n), i.e. К= m·n. It has been established a coefficient К ranging 0 to 32 СаОfr. has no significant effect on characteristics of a road concrete mix. A fly ash and ash taken in an ash-disposal area of Krasnoyarsk thermal power station 1 are recommended for the use in industry as a mineral powder in a road concrete mix. Additionally, ash taken in an ash-disposal area is to be dried and grinded, a maximal content of a fly ash in a road concrete mix is estimated to be 4% provided that a concentration of СаОfr. is less than 8%.

The Latest Research in Mongolia on the Utilization of Coal Combustion By-Products

2021 ◽  
Vol 323 ◽  
pp. 8-13
Author(s):  
Jadambaa Temuujin ◽  
Damdinsuren Munkhtuvshin ◽  
Claus H. Ruescher
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Coal Combustion ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Power Stations ◽  
Thermal Power Stations ◽  
Coal Ashes ◽  
By Products

With a geological reserve of over 170 billion tons, coal is the most abundant energy source in Mongolia with six operating thermal power stations. Moreover, in Ulaanbaatar city over 210000 families live in the Ger district and use over 800000 tons of coal as a fuel. The three thermal power plants in Ulaanbaatar burn about 5 million tons of coal, resulting in more than 500000 tons of coal combustion by-products per year. Globally, the ashes produced by thermal power plants, boilers, and single ovens pose serious environmental problems. The utilization of various types of waste is one of the factors determining the sustainability of cities. Therefore, the processing of wastes for re-use or disposal is a critical topic in waste management and materials research. According to research, the Mongolian capital city's air and soil quality has reached a disastrous level. The main reasons for air pollution in Ulaanbaatar are reported as being coal-fired stoves of the Ger residential district, thermal power stations, small and medium-sized low-pressure furnaces, and motor vehicles. Previously, coal ashes have been used to prepare advanced materials such as glass-ceramics with the hardness of 6.35 GPa, geopolymer concrete with compressive strength of over 30 MPa and zeolite A with a Cr (III) removal capacity of 35.8 mg/g. Here we discuss our latest results on the utilization of fly ash for preparation of a cement stabilized base layer for paved roads, mechanically activated fly ash for use in concrete production, and coal ash from the Ger district for preparation of an adsorbent. An addition of 20% fly ash to 5-8% cement made from a mixture of road base gave a compressive strength of ~ 4MPa, which exceeds the standard. Using coal ashes from Ger district prepared a new type of adsorbent material capable of removing various organic pollutants from tannery water was developed. This ash also showed weak leaching characteristics in water and acidic environment, which opens up an excellent opportunity to utilize.

Characteristics of Rheinisch Brown Coals With Respect to Their Combustion and Fouling Behavior in Thermal Power Stations

1977 ◽  
Vol 99 (4) ◽  
pp. 679-683 ◽  
Author(s):  
K. Hein
Keyword(s):  
Thermal Power ◽  
Research Programme ◽  
Operating Parameters ◽  
Power Station ◽  
Power Stations ◽  
Excess Air ◽  
Thermal Power Stations ◽  
Brown Coals ◽  
First Results ◽  
Fouling Characteristics

In the paper first results of a several years’ research programme into the combustion and fouling characteristics of Rheinish brown coals are given. As described, fouling of the heat transfer surfaces causes severe difficulties for power station operation. The deposit formation is strongly dependent on both the composition of the inherent ash of the fuel and the extraneous impurities. The phenomenon of fouling can be influenced by operating parameters like excess air level and mixing between fuel and combustion air. The temperature of the heat receiving surface as well as its geometry play an important role.

scholarly journals Effect of mechanical activation of fly ash added to Moroccan Portland cement

2018 ◽  
Vol 149 ◽  
pp. 01074 ◽  
Author(s):  
H. Ez-zaki ◽  
A. Diouri ◽  
M. Maher ◽  
A. Aidi ◽  
T. Guedira
Keyword(s):  
Fly Ash ◽  
Mechanical Activation ◽  
Thermal Power ◽  
Cement Industry ◽  
Production Costs ◽  
Blended Cements ◽  
Power Stations ◽  
Physico Chemical ◽  
Thermal Power Stations ◽  
Alternative Solutions

Nowadays, the cement industry is the largest emitter of CO2. In 2015, cement production accounts for roughly 8% of global CO2 emissions. In order to reduce this impact, cement plants are working on alternative solutions, for instance, producing cement by adding additives like fly ash known for reducing the emissions of CO2 and minimizing production costs. The thermal power stations in Morocco produce more than 500 000 tons per year. For ecological and sustainable development reasons, it is desirable to recycle these quantities according to beneficial methods to their addition in the cement. This study aims to investigate the influence of grinding fly ash on the physico-chemical and mechanical properties of fly ash blended CPJ45 cement. The addition of the fly ash particles to the grinder leads respectively to the breakage of the particles and to reduce the agglomeration effect in the balls of cement grinder. Fly ash milling was found to improve particles fineness, and increase the silica and alumina content in the cement. Furthermore, milled fly ash blended cements show higher compressive strength compared to unmilled fly ash blended cements, due to improved fly ash reactivity through their mechanical activation.

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