Industrial Burner Solutions for Safety & Efficiency
Proven burner technologies and local expertise to help you overcome the toughest challenges in critical industries.
Proven burner technologies and local expertise to help you overcome the toughest challenges in critical industries.
Emerson обеспечивает лучшее в отрасли сочетание доступности, надежности и экономичности для критически важного топочного оборудования, такого как котлы, горелки, печи, духовки, сушилки и мусоросжигательные установки. OEM-производители и конечные пользователи полагаются на наш широкий ассортимент инновационного надежного оборудования.
Наши предохранительные запорные клапаны ASCO обладают одной из самых высоких в отрасли пропускной способностью и помогают упростить конструкцию и эксплуатацию оборудования. Наш ассортимент предохранительных клапанов соответствует требованиям EN161, UL 429, FM и CSA.
Для подачи природного газа на промышленные горелки и котлы используются магистральные линии. Этот газ постоянно сжигается для достижения желаемой температуры. Для немедленного отключения подачи газа обычно используется клапан на магистрали и пилотный предохранительный клапан.
Строгие нормативы устанавливают жесткие параметры эффективности для предохранительных запорных клапанов. Решения ASCO для газовых горелок соответствуют широкому кругу нормативных стандартов, чтобы удовлетворить практически всем отраслевым требованиям.
Продувочные клапаны — это соленоидные клапаны, которые установлены на магистральной линии для отвода любых остатков природного газа или паров топлива после закрытия предохранительного клапана. Продувка предотвращает попадание газа в камеру сгорания при выключении системы.
По промышленным нормативам часто требуется установка продувочных клапанов, также называемых клапанами продувки топливной системы. Они должны быть высокого качества и проверены на надежность, чтобы функционировать в чрезвычайной ситуации. Они обычно оснащены индикатором открытого или закрытого положения.
В дополнение к запорному клапану для газовой магистрали, на большинстве крупных систем сгорания газа используется пилотный клапан. В системе сначала открывается пилотный клапан для зажигания запальника. Затем открывается предохранительный запорный клапан магистрали, и запальник зажигает пламя от магистрали.
Оба типа клапанов должны соответствовать строгим требованиям для применения в системах сгорания. Клапаны ASCO отвечают этим требованиям к пилотным предохранительным запорным клапанам с широким диапазоном расхода и размера.
Системы сгорания, где вместо газа сжигается или используется жидкое топливо, также требуют установки запорных клапанов. Горелки для жидкого топлива работают при значительно более высоком давлении среды, чем горелки на природном газе. Поэтому запорные клапаны для жидкого топлива должны быть прочными и мощными, чтобы немедленно перекрыть поток рабочей среды. .
Соленоидные клапаны и электрогидравлические приводы служат запорными клапанами для жидкого топлива и подходят для легкого и тяжелого топлива и мазута. Они могут быть установлены в нормально закрытом или открытом положении.
Для некоторых систем сгорания могут потребоваться другие клапаны и аксессуары, такие как трехходовой клапан с угловым корпусом, приводы, фитинги или фильтры, регуляторы, лубрикаторы (FRL).
Например, поршневые клапаны с угловым корпусом прочные и предназначены для условий, требующих повышенного давления и расхода. Электрогидравлические приводы управляют клапанами и механизмами, а сливные клапаны автоматически отводят конденсат из систем сжатого воздуха и котла.
Read our article about how Advanced Furnance Fuel Train technology can improve industrial sustainability.
Learn how Smart IIoT solutions and analytics can provide you with the actionable insights needed to reduce energy consumption
Case Study
Emerson increased production to meet an equipment manufacturer’s high-volume requirements — and delivered ASCO gas shut off valves as a drop-in replacement in less than 10 days. With the timely delivery the customer managed fluctuations in product demand and prevented shipping delays.
Case Study
To produce re-heating furnaces for steel plants in China, an OEM needed to integrate a pulse firing function to maintain an accurate temperature while reducing fuel consumption and emissions. Emerson’s high-cycling, long-life valves delivered while improving overall fuel train safety. We tested our valve up to 5 million cycles.
Case Study
An OEM supplied hundreds of industrial burners for eight vertical health furnaces in one of the world’s largest and most modern oil refineries. Emerson’s safety shut-off valve technology reduced air consumption and improved fuel train safety.
FAQs
What is a fuel safety shutoff valve ?
The fuel safety shutoff valves turns the burner ON and OFF and prevents the flow of fuel (gas or oil) into the combustion chamber should the furnace, oven, boiler, thermal oxidizer or other heating equipment shut down. fuel safety shutoff valves may be operated electrically (motorized or solenoid) or pneumatically and are required by national codes and standards.
Other valve characteristics:
What certifications govern fuel safety shutoff valves?
Safe fuel shutoff in pipe trains and gas systems is required by many industry standards and regulatory bodies, including Underwriters Laboratories (UL), Canadian Standards Association (CSA), Gas Regulation Appliance (GAR), Factory Mutual (FM), American Society of Mechanical Engineers (ASME) and National Fire Protection Association (NFPA).
Notable certifications include:
What is a fuel train and what components does it include?
A fuel train is the set of fluid control components that lead from the fuel supply up to the burner. The goal of the system is to safely control the flow of fuel into the burner and to ensure safe shutoff when needed. Fuel train assemblies consist of many components that are governed by various standards. For example:
A typical fuel train can include the gas pressure regulator, pressure switches, relief valve, first and second safety shutoff valves, vent valve, pressure gauges, gas filter and manual valves.
How does a Burner Management System work?
Large burners are controlled using a combination of a Burner Management System (BMS) and Combustion Control System (CCS).
The BMS ensures the safe startup, operation and shutdown of burners. Sometimes referred to as Flame Safeguard Systems, the BMS starts the burner in the proper sequence by first eliminating gas from the combustion chamber, lighting the pilot (if there is a pilot flame) and then opening the main fuel line. During operation, the BMS monitors the main burner flame and will cut power to the safety shutoff valves when the flame is not detected or if any unsafe condition is detected. In addition, the BMS checks for safe operating conditions upon startup; if conditions aren’t met, the BMS will stop the startup sequence and alert the operator.
The CCS consists of equipment to control the fuel-to-air ratio and firing rate. These mechanical and electronic components can include actuators, flow control valves, programmable logic controllers (PLC), variable frequency drives (VFD) and flow sensors. Under some conditions, the BMS and CCS can be integrated into the same control equipment.
What is meant by Turndown Ratio?
Turndown Ratio is a comparison of the highest and lowest output of the burner. Traditional combustion systems typically have a Turndown Ratio between 2:1 and 10:1. A higher ratio means your burner can operate more flexibly. For example, if you have a ratio of 10:1, you can operate at 100 percent all the way down to 10 percent. Without this flexibility, you would have to turn your burner on and off to meet low head-demand situations, which is not very fuel efficient.
What kind of fuel can be burned in a burner?
Fuel types include natural gas, fuel oil (diesel), biodiesel, coke oven gas, biogas, hydrogen and LPG (mainly butane and propane).
Some combustion systems use solid fuels such as solid biomass or coals, those systems are designed differently and have different rules and challenges to whom Emerson can also provide solutions.
What industry standards do I need to adhere to when it comes to the safety shutoff valves?
In the United States, you should reference the following standards:
In Europe, you should reference the following ones:
How can I meet proved-closed valve requirements?
NFPA stipulates proved-closed requirements for fuel safety shutoff valves that can be met one of two ways. The first is by implementing a proof-of-closure switch. Installed in the valve by the manufacturer, this interlock verifies that the fuel safety shutoff valve is fully closed before the system’s purge and ignition cycles can begin. A proof-of-closure switch switch needs to be factory set and non-adjustable, and it must be activated only after the valve has reached the closed position. This means that a special arrangement for overtravel must be put in place.
The second way to meet proved-closed requirements is by deploying a valve proving system. This system, which can be active or passive. When active it uses a pump to pressurize the piping between two fuel safety shutoff valves, monitors the pressurized gas for leakage prior to system startup. When passive, this system proves each valve separately with a specific sequencing of opening and closing the valve individually checking for leakages with pressure switches. A valve proving system can be mandated in Europe on burners’ fuel trains depending on their heat output. In NFPA, the valve proving system can replace the need of proof of closure switches in certain cases.
What does valve visual indication mean?
Required by many standards including FM, NFPA and UL, visual indicators show whether a fuel safety shutoff valve is open or closed, enabling operators to act with full confidence in situations where the valve must be closed for safety reasons. Indicators are typically mechanical in nature. Some standards dictate that if a light or LED is used instead, then the absence of light cannot show a position. This requirement makes having a closed-position light indication more complicated, as power to the valve stops when the component is closed.
What are some preventative maintenance measures I can take for fuel safety shutoff valves?
One way to ensure fuel safety shutoff valves are well-maintained and will operate reliably in the event of a shutdown is by conducting annual or more frequent leakage tests. Because valve seats wear over time, these tests ensure gas is not leaking through the valve.
Emerson valves for industrial burners feature a specific pressure tap to facilitate this testing procedure, allowing the valve to remain installed on the pipe during testing. These pressure taps also facilitate the installation of pressure switches for pressure limit monitoring or automatic leakage detection when used with a valve proving system.
