A method and an apparatus for protection of a combustion unit of a chemical process against over firing, the burner(s) of the combustion unit are limited by a fuel and duty limiter which limits the duty based on process feeds, combustion gas and fuel flows.

In an aspect, an HVAC system includes an inducer motor to provide combustion airflow, and a pressure sensor to measure an output airflow pressure of the inducer motor. The HVAC system may initiate the inducer motor, and receive a pulse width modulation (PWM) signal from the inducer motor, wherein the PWM signal indicates a PWM signal of the inducer motor corresponding to a predetermined airflow pressure of the inducer motor and measured by the pressure sensor. The HVAC system may compare the PWM signal to a baseline value, and control the inducer motor based on the comparing of the PWM signal to the baseline value. The HVAC system may also generate a status notification of the combustion airflow of the HVAC system in response to the comparing the PWM signal to the baseline value.

Methods and systems for testing a flame detector include receiving, at a trigger sensor of the flame detector, a coded trigger signal from a test lamp and performing a self-test operation of the flame detector in response to detection of the coded trigger signal. The flame detectors may include a trigger sensor configured to detect a trigger signal received from an external source. The trigger sensor has a field-of-view and sensitivity that is the same a flame detection sensor of the flame detector. The flame detector will perform a self-test operation when the trigger signal is received at the trigger sensor. Test lamps include a light source configured to emit light and a controller configured to control the light source to generate and output a trigger signal, wherein the trigger signal is configured to cause the flame detector to perform the self-test operation.

A heating, ventilation, and/or air conditioning (HVAC) system includes a control system configured to initiate an operating cycle of a furnace of the HVAC system at an initial operating stage in response to a call for heating, monitor a duration of time associated with the operating cycle of the furnace to satisfy the call for heating, adjust the initial operating stage to provide an adjusted initial operating stage of the furnace based on the duration of time, and initiate a subsequent operating cycle of the furnace at the adjusted initial operating stage.

Systems and methods include a computer-implemented method for providing flare header information. Instantaneous flaring flowrate data is received from flaring sources of a flare network of a processing facility. The instantaneous flaring flowrate data is analyzed in conjunction with physical properties of relief sources obtained from a heat and material balance of the processing facility. A heating value and a molecular weight are determined for each relief source and flare header using a processing model associated with a relief source type, size, and identifications. The relief sources are connected using a data signal received and processed using the processing model. Reports are generated showing average daily heating values and molecular weights for each flare header. A real-time display is provided for monitoring instantaneous heating values and molecular weights for each flare header on a real-time basis.

A cooking appliance that includes: a gas cooking element; an igniter located next to the gas cooking element to ignite the gas cooking element; a gas valve for regulating gas flow to the gas cooking element; a burner control coupled to the gas valve to vary the gas flow to the gas cooking element; and a control circuit coupled to the burner control and for activating the igniter when the burner control is positioned within a predetermined range of positions, where the control circuit detects when the burner control has been moved through the predetermined range of positions in less than a predetermined time, and in response to determining that the burner control has been moved through the predetermined range of positions in less than the predetermined time, generate an alert to a user.

A system for controlling digital gas valves of an appliance utilizing a configurable duty cycle that includes a configurable ON time, a configurable cycle period and one or more configurable burner power level variables. In some instances, the configurable duty cycle may be configured at least in part by operation of a control knob, and in some instances, multiple burner power levels may be specified such that cycling may be performed between multiple burner power levels.

A system for electronically controlling a vent damper for a gas oven.

Systems and methods for multi-variable flare control include receiving, at a flare controller, a plurality of flare characteristics from a flare monitor. The flare monitor may be an optical flare monitor. The plurality of flare characteristics may include, but are not limited to, Combustion Efficiency (CE), Smoke Index (SI), Flame Stability (FS), Flame Footprint (FF), and Heat Release (HR). The flare controller analyzes a plurality of the flare characteristics and outputs a control signal to control an operating condition of the flare, such as an amount of assist media being fed to the flare. Iterations of the control signal may be bounded by a step value defining a maximum increase or decrease in the control value as compared to the previous control value.

A water heater monitoring and notification method includes determining, by a controller of a water heater system, a deviation of a duration of a pre-purge operation from a pre-purge duration average value. The method further includes determining, by the controller of the water heater system, a deviation of a flame current from a flame current average value and determining, by the controller of the water heater system, a deviation of a pulse-width-modulation (PWM) parameter from a PWM parameter average value. The method also includes providing a notification related to a combustion system of the water heater system based on at least the deviation of the duration of the pre-purge operation from the pre-purge duration average value, the deviation of the flame current from the flame current average value, and the deviation of the PWM parameter from the PWM parameter average value.