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Boilers for power

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  • CRC Press Taylor & Francis Group 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742 © 2009 by Taylor & Francis Group CRC Press is an imprint of Taylor & Francis Group, an Informa business No claim to original U.S. Government works Printed in the United States of America on acid-free paper 10 9 8 7 6 5 4 3 2 1

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  • The purpose of these recommended guidelines is to promote safety in the use of power boilers. The term “power boiler” in this Section includes stationary, portable, and traction type boilers, but does not include locomotive and high temperature water boilers, nuclear power plant boilers.

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  • The ASME Boiler and Pressure Vessel Code (BPVC) has established rules of safety governing the design, fabrication, and inspection of boilers and pressure vessels, power producing machines (and associated subsystems) and nuclear power plant components.

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  • Revised to cover the latest innovations and trends, the newest edition of this classic work provides detailed coverage of every component of effective energy management. It includes expert information on, boilers, steam systems, cogeneration, waste-heat recovery, HVAC systems, control systems, systems maintenance, industrial insulation, indoor air quality, thermal energy storage, and codes and standards.

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  • This section provides requirements for all methods of construction of power, electric, and miniature boilers; high temperature water boilers, heat recovery steam generators, and certain fired pressure vessels to be used in stationary service;...

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  • A supplementary-fired HRSG is basically a convective unit with a design quite similar to an unfired HRSG. However the firing capability provides the ability to control the HRSG steam production—within the capability of the burner system— independent of the normal gas turbine operating mode. Fully-Fired HRSG. A few industrials have used the exhaust of the gas turbine as preheated combustion air for a fully-fired HRSG. A fully fired HRSG is defined as a unit having the same amount of oxygen in its stack gases as an ambient-air-fired power boiler.

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  • Modeling of the boiler drum is an important and difficult task. In this paper, a recursive identification method based on the time-varying Hammerstein model were proposed for the boiler drum in thermal power plant. By dividing it into the nonlinearity subsystem and the second linear subsystem, the Hammerstein model is used to represent the process dynamics.

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  • Present, our country is developing Heat power plants with CFB technology. Coal amount after burning will become ash and slag at boiler bottom with average temperature in 600o C and needs to be cooled in 80o C. This cooling equipment system must be imported from foreign countries. Therefore, author group proposed bottom ash and slag cooling technology using indirect water and heat exchange accounting method.

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  • This paper proposes a new control strategy for improving the performance of the superheated steam temperature control system in thermal power plants. Based on the analysis of the limitations of the static feedforward compensators (SFC) for temperature and boiler load disturbances in the existing control system of the auxiliary boiler in Dung Quat refinery, two adaptive dynamic feedforward compensators (ADFC) for temperature and boiler load disturbances were proposed to replace the SFCs.

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  • Since the turbine exhaust gas is essentially preheated combustion air, the supplementary-fired HRSG fuel consumption is less than that required for a power boiler providing the same incremental increase in steam generation. Characteristically, the incremental steam production from supplementary firing above that of an unfired HRSG will be achieved at 100% efficiency, based on the lower heat value of the fuel fired. The amount of incremental fuel will be about 10% to 20% less than for a natural-gas-fired power boiler providing the same incremental increase in steam produced.

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  • This paper focuses primarily on application considerations for topping cogeneration cycles. For comparative purposes Figure 1 illustrates energy utilization effectiveness (the percent of total energy output from the cycle which is useful heat and/or power) for a typical non-reheat coal- fired utility/industrial plant configuration (three-stage feed water heating with steam conditions of 1450 psig / 950°F [101 bar / 510°C] steam conditions vs. a cogeneration facility utilizing the same fired boiler but with a non-condensing steam turbine generator that supplies steam to process.

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  • MODERN POWER-PLANT CYCLES AND EQUIPMENT CYCLE ANALYSES 1.4 Choosing Best Options for Boosting Combined-Cycle Plant Output 1.4 Selecting Gas-Turbine Heat-Recovery Boilers 1.10 Gas-Turbine Cycle Efficiency Analysis and Output Determination 1.13 Determining Best-Relative-Value of Industrial Gas Turbines Using a LifeCycle Cost Model 1.18 Tube Bundle

    pdf124p phuphong 09-12-2009 154 64   Download

  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS P • A • R • T 1 POWER GENERATION Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2006 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. POWER GENERATION Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2006 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 4 STEAM GENERATION EQUIPMENT AND AUXILIARIES Determining Equipment Loading for Generating Steam Efficiently 4.2 Steam Conditions with Two Boilers Supplying the Same Line 4.6 Generating Saturated Steam by Desuperheating Superheated Steam 4.7 Determining Furnace-Wall Heat Loss 4.8 Converting Power-Generation Pollutants from Mass to Volumetric Units 4.10 Steam Boiler Heat Balance Determination 4.11 Steam Boiler, Economizer, and AirHeater Efficiency 4.14 Fire-Tube Boiler Analysis and Selection 4.

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  • The study aimed at investigating the microstructure and mechanical properties of NeodymiumDoped Yttrium Aluminum Garnet (Nd:YAG) laser welded high strength low alloy (HSLA) SA516 grade 70 boiler steel. The weld joint for a 4 mm thick plate was successfully produced using minimum laser power of 2 kW by employing a single pass without any weld preheat treatment. The micrographs revealed the presence of martensite phase in the weld fusion zone which could be due to faster cooling rate of the laser weldment.

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  • The potential use of many common hydrofluorocarbons and hydrocarbons as well as new hydrofluoroolefins, i.e. R1234yf and R1234ze(E) working fluids for a combined organic Rankine cycle and vapor compression refrigeration (ORC-VCR) system activated by low-grade thermal energy is evaluated. The basic ORC operates between 80 and 40 C typical for low-grade thermal energy power plants while the basic VCR cycle operates between 5 and 40 C.

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