Thermal energy utilization is very common in today's industrial fields, such as metal thermoprocessing, food baking, paint drying, grain drying, glass/plastic melting, fiber hair removal, etc. The sources of heat used in these fields are usually in two forms: one is the conversion of electrical energy to heat energy (which is not the topic of today's discussion), and the other is the conversion of chemical energy to heat energy.
The most common form of conversion of chemical energy to heat energy is combustion, and the most commonly used fuels in the industrial sector are gaseous fuels, such as natural gas, and liquid fuels, such as petroleum.
EN 746-2
Safety Requirements for Combustion and Fuel Handling Systems
The standard EN 746-2 describes the possible risk points during the entire combustion process:
1. Unburned fuel may be unintentionally released/leaked
2. The burner did not perform the correct ignition time
3. Failure to shut down the fuel supply in time in the event of a related failure
As a specialist in the field of machinery safety, PILZ has launched a special base module PNOZmulti 2 for the safety requirements of the burner sector – PNOZ m B1 Burner – which enables users in the burner sector to implement the safety functions of the burner based on the modular programmable safety controller PNOZmulti 2 system and to comply with the following standards:
●EN 746-2 Safety requirements for combustion and fuel handling systems
● EN 298:2012-11 Automatic combustion control systems for burners and appliances burning gaseous or liquid fuels
●EN 50156-1:2016-03 Electrical equipment for combustion furnaces and auxiliary equipment - Part 1: Requirements for application design and installation
● EN 50156-2:2016-03 Electrical equipment for combustion furnaces and auxiliary equipment - Part 2: Requirements for the design, development and type approval of safety equipment and subsystems
● UL 60730-1 (US) Automatic Electrical Control – Part 1: General Requirements
●UL 60730-2-5 (US) Automatic Electrical Control for Household and Similar Uses, Part 2-5: Special Requirements for Automatic Electric Burner Control Systems
●NFPA 85:2019 (US) Risk Codes for Boilers and Combustion Systems
● NFPA 86:2019 (US) Standard for Ovens and Burners
PNOZ m B1 Burner
Born for the burner industry
The PNOZmulti 2 system controls and monitors the safe ignition step of the furnace, the combustion air pressure, the ignition coil, the flame status, the external mixing controller status and the pipe tightness. Actuators such as fuel safety valves, ignition valves, exhaust valves, blowers and so on can all be controlled by the PNOZmulti 2 system. Depending on the application structure, the highest performance level is up to EN ISO 13849-1 PL e/Cat. 4 and IEC 61508 SIL CL 3.
The PNOZ m B1 Burner is a multifunctional combustion manager for the furnace industry that can be used for the safety monitoring and control of up to 12 furnaces at the same time. The certified prefabricated burner management software function blocks allow you to quickly and easily configure a wide range of furnace applications, such as main or slave furnaces, direct or indirect ignition, low or high temperature mode, etc. In addition, PNOZmulti 2 is equipped with an expansion module – PNOZ m EF 4DI4DORD – which provides four safe digital input points and four safe and versatile relay outputs in accordance with EN50156-1 for the control of furnace safety valves or blowers, for example. In addition to the monitoring of signals related to the combustion process, other safety functions on the system, such as the E-STOP button, the safety door/cover switch, the safety photoelectric system, etc., can be monitored by the PNOZmulti 2 system.
The comprehensive and professional diagnostic functions of the PNOZmulti 2 system extract all fault information that occurs during the combustion process and send it to the outside world by selecting different communication interface modules, so that the fault information can be quickly acquired and displayed.
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