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RESEARCH AND APPLICATION OF STATE VARIABLE …

Reheat steam temperature of the boiler in thermal power plant is one of the most important parameters of unit's security and economy. It has the large inertia and lag characteristic. Aiming at the characteristic of the controlled plant in reheat steam temperature, this paper put forwards the state variable-predictive control strategy based on the modern control theory for the control of

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Method and system for reheat temperature control

1997-2-25 · A further method to control reheat steam temperature is by water spray, also called direct contact attemperation, by which a cooling water spray is added to the fluid entering the reheater. This method can have a negative effect on cycle efficiency. Another method is to use excess air supplied to the boiler for reheater steam temperature control.

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Steam Superheater in Boiler: Role, Benefits, Types

Boiler Superheater's Manufacturing. Our superheaters are manufactured according to the IBR Regulations.Thermodyne manufactures both coil type and shell type superheaters depending upon the type of boiler and boiler capacity.. Coil type superheaters design generally consists of 180 o coils welded through the headers on both the sides. In a coil type designs steam is inside the coil and flue

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US5038568A - System for reheat steam temperature …

The arrangement of the control valves 56 and 64 is so chosen that controlability is achieved throughout the steam temperature control range and permits all reheater surfaces to be placed in the convection pass of the boiler, eliminating the need for in furnace reheater surfaces.

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Dynamic Behavior and Control of Reheated Steam …

A simple calculating formula of reheater dynamic behavior was presented.Based on the reheater structure and thermal parameters,the dynamic behavior of reheated steam temperature,about some temperature control modes such as burner tilting,gas damper and gas recirculation and water-spray disturbance,were analyzed.When main control mode can't be put into automatic opelation,two auxiliary

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Superheater and Reheater Temperature Control in …

2020-6-19 · The superheater temperature control can be done by many ways. Methods like desuperheating by water injection, flue gas flow diverting, burner tilting are few of the commonly adopted systems. In large capacity boilers the injection type desuperheating is adopted for superheater temperature control. Reheater in power boilers can also be technically classified as superheaters, …

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YAO Xiangyu, JIANG Deyong, ZHU Jiaqi, et al. The double reheat unit thermal economy research in different boiler reheater temperature control methods[J]. Electric Power Survey & Design, 2016(3): 8-15. [8],,, .

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Development of Stem Temperature Control System …

This paper discusses about the outline of design and actual experiences of our steam temperature control (STC) system. UFR boiler is constituted of single radient furnace and three gas paths system where gas passage is divided by partition water walls into a superheater path, a reheater path and a by-pass economizer path with control dampers

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US5038568A - System for reheat steam temperature …

The arrangement of the control valves 56 and 64 is so chosen that controlability is achieved throughout the steam temperature control range and permits all reheater surfaces to be placed in the convection pass of the boiler, eliminating the need for in furnace reheater surfaces.

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reheater --cnki

The method of turbine regulation has to be considered in the design of steam boiler reheater.From the point of economy,it may not be necessory to control the reheat steam temperature,but for the sake of sabety,it has to be controlled within limits.The variation of

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Boiler Controls & Instrumentation - Boilersinfo

Boiler Controls & Instrumentation Contents of Boiler Controls & Instrumentation. BOILER BASICS INSTRUMENTATION Basics of Boilers and HRSG Design COMBUSTION AND DRAFT CONTROL FEED WATER CONTROL STEAM TEMPERATURE CONTROL BOILER AUXILIARIES INTERLOCKS AND PROTECTION SYSTEM Boiler Drum Level Control BOILER CLASSIFICATION SCHEMATIC OF A BOILER Boiler …

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Intelligent modified predictive optimal control of

Abstract: A modified predictive optimal control (MPOC) scheme based on neural network modeling and particle swarm optimization (PSO) techniques is proposed in this paper for reheater steam temperature (RST) control of a large-scale boiler unit. A recurrent neural network is trained to directly model the temperature dynamic response of the

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Reheater Temperature Prediction - MDPI

2019-7-22 · Reheater Temperature Prediction Ning Gui 1, Jieli Lou 2, large variety of sensors is important for the realization of e ective control [8]. Traditional feature A reheater is a set of tubes located in a boiler, the main purpose of which is to avoid excess moisture

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A Linear Approach To System Analysis And Design Of

15  · A Linear Approach To System Analysis And Design Of Temperature Controller System For A Boiler Plant. PDF Download

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Intelligent modified predictive optimal control of

Abstract: A modified predictive optimal control (MPOC) scheme based on neural network modeling and particle swarm optimization (PSO) techniques is proposed in this paper for reheater steam temperature (RST) control of a large-scale boiler unit. A recurrent neural network is trained to directly model the temperature dynamic response of the

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US5038568A - System for reheat steam temperature …

The arrangement of the control valves 56 and 64 is so chosen that controlability is achieved throughout the steam temperature control range and permits all reheater surfaces to be placed in the convection pass of the boiler, eliminating the need for in furnace reheater surfaces.

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Reliable Superheater Tube Wall Temperature Control …

Reliable Superheater Tube Wall Temperature Control for HRSGs with Duct Firing. Issue 2 and Volume 118. 2.14.14. By Ilya Yarinovsky, Boiler/HRSG Sr be either superheater or reheater, or, in

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Boiler Reheater Temperature Control System Design Abstract Because the PID controller, good robustness advantages, it is widely used in Boiler Reheater Temperature control. At present, the boiler reheat steam temperature control in reheat steam outlet temperature, boiler safety and economic operation important role in.

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Superheater and Reheater (SH and RH) …

This is also used for SH temperature control supplementing attem — peration (Figure 6.26). Gas Recirculation and Tempering. Flue gas from a boiler, ECON, and AH exit at 250-400°C and can be introduced back into the furnace, without interfering with combustion, for …

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Combustion optimization in PF Boilers

2013-11-27 · Boiler losses and efficiency 3. Combustion measurement and optimization 4. Online diagnostic optimization localised furnace problems that can include inappropriate superheater and reheater temperature profiles, increased slagging and greater water-wall wastage. •Modeling based approach for combustion control

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