Research Papers: Energy Systems Analysis

Improved Model of an Intermediate Point Enthalpy Control System for Enhancing Boiler Efficiency

[+] Author and Article Information
Zihao Yang

School of Energy and Power Engineering,
Huazhong University of
Science and Technology,
Wuhan 430074, China
e-mail: chris_young@foxmail.com

Yanping Zhang

School of Energy and Power Engineering,
Huazhong University of
Science and Technology,
Wuhan 430074, China
e-mail: zyp2817@hust.edu.cn

Wei Gao

School of Energy and Power Engineering,
Huazhong University of
Science and Technology,
Wuhan 430074, China
e-mail: gw@hust.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 27, 2017; final manuscript received August 21, 2018; published online September 26, 2018. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 141(2), 022001 (Sep 26, 2018) (11 pages) Paper No: JERT-17-1463; doi: 10.1115/1.4041286 History: Received August 27, 2017; Revised August 21, 2018

Control quality of an once-through boiler’s water-fuel ratio (WFR) and main-steam temperature are heavily influenced by the control quality of the once-through boiler’s intermediate point enthalpy (IPE), and it is also related to the economic and stable operation of the a once-through boiler. In order to control the IPE in a better way and to increase boiler efficiency, an improved model of IPE control system was built in this paper, matlab/simulink is used to build the IPE control system model based on a 600 MW supercritical unit, and the mechanism model of the control object is built in the same time. The feedforward of the feed-water temperature is brought to this model to increase the control rate. The control method of amendments to the amount of coal and the control method of amendments to the amount of feed-water are combined by the means of fuzzy control to solve the problem of the contradiction of the responding speed of the IPE and the separation interface’s stability of the steam-water separator. The simulation results show that the improved control method has better control effect and higher boiler efficiency was obtained as well.

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Fig. 1

The schematic representation of the once-through boiler

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Fig. 2

One-dimensional mechanism model of the spiral water-wall in simulink

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Fig. 3

Simplified one-dimensional mechanism model of the once-through boiler in simulink

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Fig. 4

Intermediate point enthalpy control system based on the feedforward of the feed-water temperature

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Fig. 10

The overall system simulation model in Simulink

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Fig. 9

Degree of membership functions of Δh (a) and k (b)

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Fig. 8

Improved model of the IPE control system with fuzzy control

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Fig. 7

Logical diagram of the IPE control system with fuzzy control

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Fig. 6

Model of the amendments control method

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Fig. 5

Feedforward of the feed-water temperature model in Simulink

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Fig. 11

Control effects of the coal quantity in the 75%THA working load

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Fig. 12

Control effects of the feed-water quantity in the 75%THA working load

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Fig. 13

Control effects of the enthalpy in the 75%THA working load

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Fig. 14

Boiler efficiency curves during load-varying process



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