Ship LNG Automation & LNG Boiler Systems | Texon Automation

<BODY> <h1>Texon Automation</h1> Boiler control specialists for LNG and other types of steam-turbine vessels, where demands for control-performance are extreme. <h2>Press release</h2> Kockumation Group forms a new and competent lineup, consisting of Kockum Sonics along with the recently made acquisitions of Texon Automation and Polarmarine. <a href="pdf/press_release_kockumation_%20071002.pdf" target="_blank">For more information download Press Release in PDF format >></a> <br><br> <a href="main.htm">Home</a> <br><br><br> <h1>Products</h1> <h2>General on Texon control systems</h2> <h3>Redundancy</h3> Fully compliant with DNV regulations, "Instrumentation and Automation", section 2, A500 and beyond. <br><br> <h3>Hardware</h3> Equipment is fully compliant with the relevant classification society rules. <br><br> <h3>Man-Machine Interface (MMI)</h3> Adapted for various demands, utilizing all modern and traditional varieties of MMI for no-fuzz operations, maximum ergonomics and rapid accessibility. <br><br> <h2>Combustion Controls (ACC)</h2> <h3>Basic design features</h3> <ul> <li>Rugged design, based on development, design, installation, commissioning and operation of more than 250 marine boilers, of which 20 are dual fired onboard LNG-carriers, over a period of more than 25 years. <li>Extensive system funcionality and operators support for start up and any abnormal condition operations.</li> <li>Totally integrated functions (no unwanted lead/lag) together with error adaptive parameter settings result in supreme response at rapid load changes, yet maintaining steady operation at normal conditions.</li> <li>Extended turndown capabilities: The control valve is one of the major limiting factors for control system turn down. Due to careful selection and utilization of high turn down control valves (up to 500:1) and avoiding split range operation, supreme performance is achieved. </li> </ul> <br><br> <h2>General</h2> <ul> <li>The combustion control is a fully automatic, compact and reliable combustion control system for dual-fuel boilers on LNG carriers or single fuel boilers on other types of main steam turbine equipped vessels. The system maintains steam pressure within very close tolerances even during rapid load changes. It governs the supply of fuel and combustion air to the boiler furnace in close accordance with current steam demand, and permits instant and efficient engine control. The air/fuel ratio for optimum combustion efficiency is closely controlled.</li> <li>Combustion trim controller is often included in the system to compensate for the (inevitable) inaccuracy in measurement of fuel calorific values and combustion air mass.</li> </ul> <h2>Steam dump control</h2> <ul> <li>The steam dump control system operates with the steam pressure and LNG-boil off gas flow as process parameters. The steam dump valve will operate as required in order to maintain a constant steam pressure. The opening is prevented by condenser safety functions, e g high pressure or temperature.</li> <li>The steam dump is also used to maintain a desired cargo tank pressure on LNG-carriers Gas/oil relation calculator (Dual fuel boilers)</li> <li>The "Gas/oil relation calculator" is based on the principle of communicating vessels, i e if one of the fuels is reduced the other is instantly increased. The Texon-Kockums system keeps track on the actual fuel flow, comparing this with the fuel demand.</li> <li>For each fuel, the demand is compared with the actual flow. If one fuel is insufficient, the other fuel will instantly be added.</li> <li>Gas/oil relation calculator can be configurated to burn a minimum amount of fuel oil, if fuel gas is available. However, in order to meet the operational requirements it is fully selectable. Inputs to gas/oil relation calculator are fuel demand, actual gas flow, actual oil flow and desired relation between fuel gas and fuel oil.</li> <li>By utilizing multiple parameter controllers and thanks to gas/oil relation calculator design, no separate fuel oil boost controller is required.</li> <li>The fuel gas demand signal is corrected by tank pressure controller to maintain tank pressure floating between the two preset limits.</li> </ul> <br><br> <h2>Cross limiting</h2> <ul> <li>Fuel oil flow as well as fuel gas flow is limited if the air supply is insufficient.</li> <li>The combustion air is limited if the actual fuel flow is insufficient.</li> <li>The combustion air is forced to increase if actual fuel flow is higher than the demand. </li> </ul> <br><br> <h2>Fuel oil flow control valves</h2> The Texon-Kockums system utilizes control valves with exceptional turn down ratio, up to 500:1. Control valves usually have a turn down ratio of 50-75:1 and may therefore often require a split range setup using two valves. Split range operation of control valves is avoided by Texon due to the inevitable difficulties to achieve a well defined switch between the valves operation ranges. <br><br> <b>The advantages are:</b><br> - better control performance<br> - better reliability<br> - less maintenance<br> - lower cost <br><br> <h2>Fuel oil flow measurement.</h2> <b>The Texon-Kockums system is utilizing the well defined burner pressure/flow ratio as process parameter, rather than differential pressure drop across a fixed or variable orifice.</b> <ul> <li>Far better signal resolution and accuracy at high turndown operation</li> <li>Less sensitivity to transmitter zero drift</li> <li>Only one setting for min and max flow, i e not related to number of burners in operation</li> <li>Operating on full signal range independent of the number of burners in operation.</li> <li>Measurement is not affected by fuel oil recirculation, which is important for achieving minimum fuel oil consumption at gas firing. </li> </ul> <br><br> <h2>Fuel gas flow measurement.</h2> The Texon-Kockums system is utilizing the well defined burner pressure drop/flow ratio as process parameter, rather than differential pressure drop across an orifice or venturi. <ul> <li>Far better signal resolution at burner sequensing conditions, i e firing less than all burners</li> <li>Less sensitivity to transmitter zero drift</li> <li>Only one setting for min and max flow, i e not related to number of burners in operation</li> <li>Operating on full signal range independent of the number of burners in operation.</li> </ul> <br><br> <h2>Combustion air flow measurement.</h2> The Texon-Kockums system is utilizing the well defined burner register draught loss as process parameter, rather than differential pressure drop across a venturi arrangement in F.D. fan duct. <ul> <li>Far better signal resolution at burner sequensing conditions, i e firing less than all burners</li> <li>Less sensitivity to transmitter zero drift</li> <li>Only one setting for min and max flow, i e not related to number of burners in operation</li> <li>Operating on full signal range independent of the number of burners in operation.</li> <li>Independent of F.D. fan operating conditions (one fan per boiler or one fan for both boilers)</li> </ul> <br><br> <h2>Burner Management Systems (BMS)</h2> <h3>Basic features</h3> <ul> <li>The Burner Management System is a fully automatic control system for boiler safety and easy burner light up and shut down.</li> <li>Safety functions such as trip of fuel valves for various reasons are integrated in the system, with some critical sensors duplicated, e g for drum water level.</li> <li>Cascade of burners (Automatic start/stop) can be performed by BMS on order from ACC.</li> <li>The boilers can be operated from a control room panel or workstation as well as from a local control panel on the burner platform. Automatic control can be initiated from both panels.</li> <li>The system requires no manual operations under normal operating conditions. </li> </ul> <br><br> <h2>Boil Off Gas (BOG) control systems</h2> <h3>Cargo tank pressure control.</h3> <ul> <li>The tank pressure can vary between floating tank pressure setpoints.</li> <li>Pressure is reduced by increasing fuel gas firing together with steam dumping or increase of ship speed.</li> <li>Pressure is increased by reducing fuel gas firing together with increased fuel oil firing. </li> </ul> <h3>Compressor control.</h3> <ul> <li>Compressor capacity is controlled by means of speed and/or inlet vanes in order to maintain fuel gas control valves within optimum control range. </li> </ul> <br><br> <h2>Flame monitoring</h2> <h3>Basic functions</h3> <ul> <li>Flame scanners for different emission spectras, 200 (UV) and 800nm (IR)</li> <li>Floating reference system.</li> <li>Flame On and Off time delay.</li> <li>Selfcheck</li> <li>Scanner failure alarm </li> </ul> <br><br> <a href="products.htm">Products</a> <br><br><br> <h1>LNG (Liquefied Natural Gas)</h1> Texon/Kockums has since the building of LNG-carriers "Polar Alaska" and "Arctic Tokyo" 1968, continously supplied and serviced boiler and boil-off gas control systems for a number of LNG-carriers. <br><br> Our range of products for LNG-carriers include <ul> <li>Combustion control systems (ACC)</li> <li>Burner management systems (BMS) <li>Boil off gas controls:<br> -Cargo Tank Pressure Control<br> -Low Duty Compressor Control<br> -Vent mast control<br> -Fuel gas heater control<br> -Forcing vaporizer control<br> -Spray header pressure control<br> -Spray Control<br> -Steam Dump System </li> <li>Flame monitoring</li> <li>General steam plant controls</li> </ul> <br><br> <a href="lng.htm">LNG</a>  <script type="text/javascript"> var gaJsHost = (("https:" == document.location.protocol) ? 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