Study and Design on High Temperature Air Combustion of Hot Blast Stove

2014 ◽  
Vol 496-500 ◽  
pp. 1058-1062
Author(s):  
Fu Ming Zhang ◽  
Zu Rui Hu ◽  
Shu Sen Cheng
Keyword(s):  
High Temperature ◽  
Concentration Distribution ◽  
Cfd Simulation ◽  
Formation Rate ◽  
Flame Temperature ◽  
Combustion Process ◽  
High Temperature Air Combustion ◽  
Blast Stove ◽  
New Type ◽  
Hot Blast

During Hot Blast Stove (HBS) combustion, NOxforms rapidly when the flame temperature above 1420°C. In order to restrain the amount of NOxformation during combustion of HBS, the formation mechanism of NOxis investigated, and the NOxformation rate and amount in HBS are calculated by means of thermodynamic model. A new type of dome combustion HBS is developed based on high temperature air combustion (HTAC) technology. A comparison on the combustion process and characteristic of conventional HBS and HTAC HBS is performed by application of Computational Fluid Dynamics (CFD) simulation model. Temperature and concentration distribution, flame shape and NOxconcentration distribution of two kinds of stove are calculated. The result shows quite symmetrical HTAC stove temperature distribution. Under the same dome temperature, NOxamount is 80ppm only, reduced by approximate 76% in comparison with conventional stove.

Study on High Temperature Air Combustion of Hot Blast Stove

2014 ◽  
Vol 875-877 ◽  
pp. 715-719
Author(s):  
Fu Ming Zhang ◽  
Zu Rui Hu ◽  
Shu Sen Cheng
Keyword(s):  
High Temperature ◽  
Field Distribution ◽  
Combustion Process ◽  
Concentration Field ◽  
Generation Model ◽  
High Temperature Air Combustion ◽  
Blast Stove ◽  
Campaign Life ◽  
Higher Temperature ◽  
Hot Blast

NOx is the major technical barrier to increase hot blast temperature and prolong campaign life of hot blast stove (HBS) at present. In order to restrain the amount of NOx formation during combustion process in the HBS, the paper studies and analyses the generation mechanism of NOx production, and calculates NOx generation rate and amount in HBS by means of thermodynamic generation model. A new dome combustion stove is developed based on high temperature air combustion (HTAC) technology. A comparison on the combustion process and characteristic of conventional HBS and HTAC HBS is performed by application of CFD numerical simulation model. Temperature and concentration field distribution, flame shape and NOx concentration distribution of two kinds of stove are calculated. The result shows quite symmetrical HTAC stove temperature field distribution. Under the same dome temperature, NOx generation is 80ppm only, reduced by approximate 76% in comparison with conventional stove. HTAC HBS can obtain higher temperature, energy-saving, emission-reducing, and decrease NOx emission efficiently, as well as realize long campaign life of HBS.

Operation of the lining of a model high-temperature hot-blast stove

Refractories ◽  
1984 ◽  
Vol 25 (11-12) ◽  
pp. 663-666 ◽  
Author(s):  
F. R. Shklyar ◽  
E. D. Lekomtseva ◽  
M. I. Agafonova ◽  
N. L. Brun'ko ◽  
E. L. Surgucheva ◽  
...  
Keyword(s):  
High Temperature ◽  
Blast Stove ◽  
Hot Blast

Research and Application of the New Technologies on Blast Furnace at Shougang Qiangang Plant

2011 ◽  
Vol 402 ◽  
pp. 151-155 ◽  
Author(s):  
Fu Ming Zhang
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
High Efficiency ◽  
New Technologies ◽  
Technical Equipment ◽  
Gas Temperature ◽  
Bag Filter ◽  
Large Blast ◽  
Blast Stove ◽  
Hot Blast

In recent years great progress is made in technical equipment of large blast furnace in China. A series of new process, technologies and equipment, integrated and developed on our own, are applied on newly built large blast furnaces and have been proved to be highly effective. After more than 20 years’ development and innovation of the bell-less top equipment designed and developed on our own, it has reached the advanced level in the world in terms of equipment reliability and service life; fully-dry impulse bag filter dedusting technology of BF gas, which is also developed on our own, has gained technical breakthroughs in terms of optimized system design, gas temperature control, pneumatic conveying of dedusting fines; the integrated innovative high-efficiency long-life high-temperature technology, through applying high-temperature preheating technology of combustion air, improving heat transfer efficiency of hot blast stove and optimizing structure of the hot blast stove system, enables the blast temperature to reach 1250°C with BF gas as fuel.

scholarly journals Producing Effective and Clean Coke for Household Combustion Activities to Reduce Gaseous Pollutant Emissions

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Shoujun Liu ◽  
Ju Shangguan ◽  
Song Yang ◽  
Wenguang Du ◽  
Xudong Yan ◽  
...  
Keyword(s):  
High Temperature ◽  
Combustion Process ◽  
Pollutant Emissions ◽  
Atmospheric Environment ◽  
Gaseous Pollutant ◽  
New Type ◽  
Coke Combustion ◽  
Household Activities ◽  
Sulfur And Nitrogen Compounds ◽  
Sulfur Fixation

Nowadays, the gaseous pollutant emissions, including particulate matter (PM), sulfur dioxide (SO2), and nitrogen oxide (NOx) from household coal combustion, cause great threat to environment and public health by contributing to severe haze in China. Particularly, a clean coke free of the major pollutants precursors (sulfur and nitrogen compounds) by sulfur fixation and denitrification has been deemed as an effective strategy to reducing pollutants. In this paper, a preprocessed coke was prepared by co-pyrolysis of high-sulfur coal with the assistance of calcium-based and iron-based complexes at high temperature. The results show that high-temperature co-pyrolysis could remove the volatile compounds that are major precursors for the formation of gaseous pollutants from the raw coal. During the coking process, the sulfur can be removed by being fixed in the form of CaS in presence of a Ca-based complex, which could be beneficial for the CaSO4 during the coke combustion. The volatile nitrogen is transferred to the gas phase with the addition of Fe-based complexes, which effectively reduce the residual nitrogen in coke. As a result, Ca-based additives captured the released SO2 and formed CaSO4 during the combustion process. In addition, in the presence of Fe-based complexes, both char and CO react with NOx to form N2, which leads to a reduction in NOx emissions during combustion. Additionally, the replacement of current residential coal with a new type of clean coke is a facile method for reducing gaseous pollutant emissions from household activities to protect the atmospheric environment. The average emission factors (EFs) of PM, SO2, and NOx for the prepared clean coke were small during combustion and were much lower than the EFs of the tested raw coal, semicoke, and briquettes.

High temperature hot blast stove

Metallurgist ◽  
1957 ◽  
Vol 1 (9) ◽  
pp. 557-560 ◽  
Author(s):  
Yu. I. Gokhman
Keyword(s):  
High Temperature ◽  
Blast Stove ◽  
Hot Blast

The Effect of Distance Between Fuel and Oxidizer Nozzles on NOx Emission From High Temperature Air Combustion

2011 ◽  
Author(s):  
Yuzuru Nada ◽  
Yasutomo Zenman ◽  
Takahiro Ito ◽  
Susumu Noda
Keyword(s):  
High Temperature ◽  
Flame Temperature ◽  
Dilution Effect ◽  
Nox Emission ◽  
Emission Characteristics ◽  
High Temperature Air Combustion ◽  
Flamelet Model ◽  
Scaling Parameters ◽  
Fuel Nozzle ◽  
Emission Index

This study describes NOx emission characteristics of a high temperature air combustion furnace operating with parallel jet burner system. In the parallel jet burner system, fuel nozzles are separated with a distance from an oxidizer nozzle. Objectives of this study are to clarify the effect of the distance between the fuel nozzle and the oxidizer nozzle on NOx emission. The emission index of NOx (EINOx) decreases with the increase in the distance. This is due to the dilution through entrainment of burned gas. A scaling concept is proposed to assess the dilution effect on the NOx emission. Scaling parameters employed here are the global residence time of fuel and the flame temperature evaluated on a modified flamelet model in which the dilution effect is included. The overall EINOx production rate is scaled with the flame temperature. This scaling indicates the importance of the distance between the nozzles for NOx emission.

New Mechanism of Saving Energy and Reducing Pollution in Burning Processing of Emulsified Oil

2013 ◽  
Vol 634-638 ◽  
pp. 768-774
Author(s):  
Yuan Yu Tian ◽  
Ying Yun Qiao
Keyword(s):  
High Temperature ◽  
Heavy Oil ◽  
Flame Temperature ◽  
Combustion Process ◽  
Diesel Oil ◽  
Heat Transmission ◽  
Saving Energy ◽  
Emulsified Oil ◽  
Water Slurry ◽  
High Temperature Condition

A new mechanism of saving energy and reducing pollution is brought forward by analyzing water characters in high temperature condition and all factors which bring saving energy and reducing pollution in the combustion process of emulsification oil. The theory shows that the reason of saving energy and reducing pollution is that emulsification oil can reduce surplus air ratio effectively in the combustion process. These reasons include that of improving the burning flame temperature, avoiding the local super-high temperature, decreasing the amount of NOX and the conversion of SO2 oxidize to SO3, strengthening the burning and heat transmission and reducing the soot of the flue gas.By this new theory, the reasons of saving energy and reducing pollution in the combustion process of emulsification gasoline, emulsification diesel oil, emulsification heavy oil and other slurry fuel of W/O or O/W can be well explained. At the same time, the new mechanism was well validated in the combustion process of hard asphalt water slurry.

Calculations Related to Municipal Solid Waste MSW Burning Under High Temperature Air Combustion HiTAC Conditions

2007 ◽  
Author(s):  
David G. Lilley
Keyword(s):  
High Temperature ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Energy Production ◽  
Flame Temperature ◽  
Computer Code ◽  
Automatic Generation ◽  
High Temperature Air Combustion ◽  
Rapid Generation ◽  
Current Research Interest

New “high temperature air combustion” HiTAC technologies are evolving for the incineration of municipal solid waste for energy production and minimal pollution. As a contribution to this area of current research interest, a calculation procedure has been developed that permits rapid generation of general fuel-air combustion with many parameter variations. The program calculations are via Excel/VBA with immediate graphics of the parameter effects on the results. Thus, an extensive range of parameter effects may be quickly investigated and assessed. The very-general fuel is specified by way of its C-H-O-N-S content and additional water content and the “air” by way of the volume percent of oxygen, and the other component of “air” (nitrogen and/or carbon dioxide), each specified by the user. The temperature of each inlet (fuel and “air”) is specified by the user. The methodology and computer code takes as input also the equivalence ratio. Then, results of adiabatic flame temperature are calculated along with the equilibrium product species both with and without dissociation. Alternatively, the products temperature may be specified and the heat transfer in the combustor is then calculated. The computer code is very user friendly, with automatic nested loops for parameter variation and automatic generation of graphs, which are particularly useful in assessing the particular process under consideration. The application now is to incineration of municipal solid waste for energy production and minimal pollution. The waste may consist of a variety of specified components, including plastics and non-plastics, cellulose, cardboard, wood, etc. In the developed computer code, the choice of which components and their relative amounts is easily specified by the user.

High Temperature Air Combustion (HiTAC) Phenomena and its Thermodynamics

2014 ◽  
Author(s):  
Nabil Rafidi ◽  
Wlodzimierz Blasiak ◽  
Ashwani K. Gupta
Keyword(s):  
High Temperature ◽  
Energy Savings ◽  
Combustion Process ◽  
Point Of View ◽  
Low Oxygen ◽  
High Temperature Air Combustion ◽  
Improve Efficiency ◽  
Thermodynamic Irreversibility ◽  
Combustion Processes ◽  
Low Oxygen Concentration

The fundamentals and thermodynamic analysis of High Temperature Air Combustion (HiTAC) technology is presented with focus on industrial furnaces as they are amongst the major energy users. The HiTAC is characterized by high temperature of combustion air having low oxygen concentration. This study provides a theoretical analysis of HiTAC a process from the thermodynamic point of view. The results demonstrate the possibilities of reducing thermodynamic irreversibility of combustion by considering an oxygen-deficient combustion process that utilizes both gas- and heat-recirculation. Furthermore, combustion with the use of oxygen (in place of air) is also analyzed. The results showed that a system which utilizes oxygen as an oxidizer results in higher 1st and 2nd law efficiencies as compared to the case with air as the oxidizer. This study is aimed at providing technical guidance to further improve efficiency of a combustion process which show very small temperature increases due to mild chemical reactions. The significant of these findings are now widely used in industrial furnaces with singular successes on energy savings, pollution reduction and reduced size of the equipment. The exergy analysis too can be used as a technical tool to improve efficiency in combustion processes.

Sign in / Sign up

Export Citation Format

Share Document