The design and assembly of a smart device constituent of a micro-machined (a.k.a. MEMS, Micro Electro Mechanical Systems) mass flow sensor and an electrically controllable valve for applications in safety enhancement and intermit connectivity for residential or commercial gas range is disclosed in the present invention. The said smart device detects the gas flow at the unattended situations and sends information to the destined mobile devices of the users via the network such that it enables the users to remotely execute actions of either shutting off the gas supply or call for relevant party's immediate attention. The said smart device shall also automatically shut off the gas supply should the transmitted signal to users failed to send feedback signal such that it can prevent the safety incidents due to leakage or overheating or even fires. The capability of the MEMS mass flow sensor shall also provide the thermal value measurement of the supplied gases and enable the user to program the gas range for making complete tasks of cooking substances in the unattended situation.

Described is a device (11) for controlling the combustion of a burner (1), comprising: first means (12) for measuring the fuel flow rate (Vg); second means 13 for measuring the flow rate of the comburent (Va) first operator means (14) for controlling the opening of an inlet valve (5) as a function of the quantity of fuel to be supplied to the burner (1); second operator means (15) for controlling the comburent flow regulator means (8) as a function of the quantity of comburent to be supplied to the burner (1); According to this invention, the device (11) comprises a unit (16) for controlling the first operator means (14) and the second operator means (15) as a function of the values measured by the first measuring means (12) and by the second measuring means (13).

The present invention describes a device for delivering a combustible gaseous mixture (M) comprising a first duct for feeding air (A) and a second duct for feeding a gaseous fuel (G), which join in a mixing zone, in which the gaseous fuel (G) and air (A) mix according to a lambda coefficient () before being sent to a burner, a ventilation device for feeding the air (A) and at the same time suctioning gaseous fuel (G) along said ducts, and means for regulating the flow rate of gaseous fuel (G). The invention also concerns a method to use a device for delivering a combustible gaseous mixture (M).

Systems and methods are provided for gas furnace systems, including a pressure transducer and optionally one or more pressure switches for efficiently achieving multiple operating modes and/or multiple fuel-to-air mixtures. The pressure transducer may determine a pressure setting at the heat exchanger and based on the pressure value may determine an amount to open a gas valve. As pressure transducer is capable of detecting a range of pressures, multiple different operational modes may be achieved by adjusting the opening of the gas valve depending on the detected pressure. The pressure switches may be used to calibrate and/or confirm the accuracy of the pressure transducer. For example, the output of a pressure switch may be compared to an output of a pressure transducer at a given inductor fan setting to determine whether the pressure transducer is accurate and/or calibrated.

Systems and methods for reducing NO.sub.x and CO emissions in a natural draft heater are disclosed. For example, the disclosure provides embodiments of systems and methods for controlling a draft value within a heater shell to deliver an amount of excess air to a burner to thereby maintain at least one of NOx emissions not exceeding 0.025 lb/MMBtu (HHV) and CO emissions not exceeding 0.01 lb/MMBtu (HHV) in a natural draft heater.

A burner control system for improving burner performance and efficiency. The system may determine fuel and air channel or manifold parameters. Determination of parameters may be performed with a sensor connected across the air and fuel channels. A signal from the sensor may control the parameters which in turn affect the amounts of fuel and air to the burner via a controller. Parameter control of the fuel and air in their respective channels may result in more accurate fuel and air ratio control. One or more flow restrictors in fuel and/or air bypass channels may further improve accuracy of the fuel and air ratio. The channels may be interconnected with a pressure or flow divider. Byproducts of combustion in the exhaust, temperatures of gas and air, flame quality and/or other items may be monitored and adjusted with control of the fuel and air ratio for optimum combustion in the burner.

A method of and control apparatus for operation of a boiler plant are described. The boiler plant has a furnace volume, an oxyfuel firing system for oxyfuel combustion of fuel in the furnace volume, and a compression system for compression of gases exhausted from the furnace volume after combustion. The method and control apparatus are characterized by the step of controlling mass flow of gases through the compression system as a means to control pressure within the furnace volume. This invention relates to both single and multi unit arrangements.

The present invention describes a device for delivering a combustible gaseous mixture (M) comprising a first duct for feeding air (A) and a second duct for feeding a gaseous fuel (G), which join in a mixing zone, in which the gaseous fuel (G) and air (A) mix according to a lambda coefficient () before being sent to a burner, a ventilation device for feeding the air (A) and at the same time suctioning gaseous fuel (G) along said ducts, and means for regulating the flow rate of gaseous fuel (G). The invention also concerns a method to use a device for controlling the delivering of a combustible gaseous mixture (M).

Systems and methods for reducing NO.sub.x and CO emissions in a natural draft heater are disclosed. For example, the disclosure provides embodiments of systems and methods for controlling a draft value within a heater shell to deliver an amount of excess air to a burner to thereby maintain at least one of NO.sub.x emissions not exceeding 0.025 lb/MMBtu (HHV) and CO emissions not exceeding 0.01 lb/MMBtu (HHV) in a natural draft heater.

Exemplary embodiments are disclosed of systems including electronic differential pressure sensors for electronically controlling stepper gas valves to modulate fuel flow in PAM combustion systems (e.g., PAM furnace systems, etc.). Also disclosed are exemplary methods for electronically modulating fuel flow in pressure augmented modulation (PAM) combustion systems.