Energy Recovery of Blast-Furnace Gas Coke: The Importance of a Correct Regulation System

1996 ◽  
Vol 118 (3) ◽  
pp. 610-619
Author(s):  
D. Laforgia ◽  
F. Ruggiero
Keyword(s):  
Blast Furnace ◽  
Energy Recovery ◽  
Response Times ◽  
Electric Energy ◽  
Experimental Tests ◽  
Dynamic Responses ◽  
Regulation System ◽  
Residual Pressure ◽  
Blast Furnace Gas ◽  
System A

The present work deals with the regulation system of a plant recovering the energy of blast-furnace gas coke residual pressure. Such a plant is equipped with a turbogenerator, which produces electric energy, expanding the gas coke up to the mill pipe network pressure value. Before revamping, the regulation system consisted of an automatic nozzle control of a turbine stator and a throttle valve. Once the system became operative, the regulation system seemed to be inadequate because it caused a significant reduction in energy recovery due to the variation of the gas coke characteristics, compared to the original engineering specifications. A mathematical model for the plant simulation has been developed through the regulation system static and dynamic responses. This simulation, together with a series of experimental tests, identified the causes of the operational problems in the original regulation system. On the basis of the response times of the old regulation system, a value with reduced intervention inertia has been suggested. The regulation logic was also modified: The valve interventions were directly linked to the pressure variations recorded at the blast furnace top, and no longer to the opening variation of the turbine automatic system. A more rational use of the plant components and its control system, together with an increase of the electric energy production, have been demonstrated.

Investigations of the Stabilities of Piloted Flames Using Blast Furnace Gas

2015 ◽  
Author(s):  
Chunyan Li ◽  
Haojie Tang ◽  
Liyue Jing ◽  
Min Zhu
Keyword(s):  
Blast Furnace ◽  
Low Cost ◽  
Diagnostic System ◽  
Calorific Value ◽  
Dynamic Responses ◽  
Low Grade ◽  
Blast Furnace Gas ◽  
Flame Dynamics ◽  
Main Burner ◽  
Set Up

The effective utilization of low-grade energy sources generated from steel-making processes provides not only excellent opportunities for low cost power generation but also a significant means for the reduction of greenhouse gas emissions. In this paper, the work was carried out to study the static and dynamic combustion instabilities for gas turbine combustors burning low-calorific-value blast furnace gas (BFG). A burner was designed to stabilize the BFG flame with central pilot flames. A diagnostic system was set up to detect the characteristics of flame dynamics. In the experiments, the fuel ratio between the pilot and main burner and, the equivalence ratio of the main flame and the annular flow velocity were varied for the investigation of the combustion lean blowout (LBO) limits. The flame dynamics near LBO were investigated. The dynamic responses of the flame to flow perturbations were also measured. A network model was employed to study and validate the blowout mechanisms. The LBO limits were calculated and compared with experimental results for various equivalence ratios.

scholarly journals Comparative Analysis of Gas Turbine Systems for Pressure Energy Recovery From Blast Furnace Gas

1984 ◽  
Author(s):  
Giuseppe Leo Guizzi
Keyword(s):  
Blast Furnace ◽  
Gas Turbine ◽  
Energy Recovery ◽  
Turbine Unit ◽  
High Capacity ◽  
Integrated System ◽  
Main Process ◽  
Blast Furnace Gas ◽  
Gas Heating ◽  
Water Saturated

Modern high capacity blast furnaces are generally operated at high values of back pressure at the top of the furnace (250÷400 kPa abs.). In order to recover this large quantity of pressure energy some turbine equipments have been recently developed. The possible solutions of these systems must take into account the clean up outcoming blast furnace gas conditions (cold and water saturated gas). Up-to-date solution analysis has carried to three different main process types: wet expansion; dry expansion by partial burning of gas; dry expansion by gas heating in a heat exchanger. This paper develops an energy based analysis for these equipments taking into account not only the recovery in the turbine unit, but also the effect of this equipment on the whole integrated system “blower - cowpers - blast furnace - gas turbine unit - power conversion station”. A parametric analysis is performed and the obtained results are presented and discussed.

Investigations of the Stabilities of Piloted Flames Using Blast Furnace Gas

2015 ◽  
Vol 138 (3) ◽  
Author(s):  
Chunyan Li ◽  
Haojie Tang ◽  
Liyue Jing ◽  
Min Zhu
Keyword(s):  
Blast Furnace ◽  
Low Cost ◽  
Diagnostic System ◽  
Calorific Value ◽  
Dynamic Responses ◽  
Low Grade ◽  
Blast Furnace Gas ◽  
Flame Dynamics ◽  
Main Burner ◽  
Set Up

The effective utilization of low-grade energy sources generated from steel-making processes provides not only excellent opportunities for low cost power generation but also a significant means for the reduction of greenhouse gas emissions. In this paper, the work was carried out to study the static and dynamic combustion instabilities for gas turbine (GT) combustors burning low-calorific-value blast furnace gas (BFG). A burner was designed to stabilize the BFG flame with central pilot flames. A diagnostic system was set up to detect the characteristics of flame dynamics. In the experiments, the fuel ratio between the pilot and main burner, and the equivalence ratio of the main flame and the annular flow velocity were varied for the investigation of the combustion lean blowout (LBO) limits. The flame dynamics near LBO were investigated. The dynamic responses of the flame to flow perturbations were also measured. A network model was employed to study and validate the blowout mechanisms. The LBO limits were calculated and compared with experimental results for various equivalence ratios.

DESIGN OF AIR PRE-HEATER FOR BLAST FURNACE GAS FIRED BOILER

2016 ◽  
Vol 1 (3) ◽  
pp. 53-59
Author(s):  
Venkateshkumar R ◽  
Kishor Kumar ◽  
Prakash B ◽  
Rahul R
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Gas

Towards a new design with generic modeling and adaptive control of a transformable quadrotor

2021 ◽  
pp. 1-31
Author(s):  
S.H. Derrouaoui ◽  
Y. Bouzid ◽  
M. Guiatni
Keyword(s):  
Adaptive Control ◽  
Control Strategy ◽  
Experimental Tests ◽  
Generic Model ◽  
System Control ◽  
System A ◽  
Viable Solution ◽  
Generic Modeling ◽  
Adaptive Control Strategy ◽  
The Stability

Abstract Recently, transformable Unmanned Aerial Vehicles (UAVs) have become a subject of great interest in the field of flying systems, due to their maneuverability, agility and morphological capacities. They can be used for specific missions and in more congested spaces. Moreover, this novel class of UAVs is considered as a viable solution for providing flying robots with specific and versatile functionalities. In this paper, we propose (i) a new design of a transformable quadrotor with (ii) generic modeling and (iii) adaptive control strategy. The proposed UAV is able to change its flight configuration by rotating its four arms independently around a central body, thanks to its adaptive geometry. To simplify and lighten the prototype, a simple mechanism with a light mechanical structure is proposed. Since the Center of Gravity (CoG) of the UAV moves according to the desired morphology of the system, a variation of the inertia and the allocation matrix occurs instantly. These dynamics parameters play an important role in the system control and its stability, representing a key difference compared with the classic quadrotor. Thus, a new generic model is developed, taking into account all these variations together with aerodynamic effects. To validate this model and ensure the stability of the designed UAV, an adaptive backstepping control strategy based on the change in the flight configuration is applied. MATLAB simulations are provided to evaluate and illustrate the performance and efficiency of the proposed controller. Finally, some experimental tests are presented.

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