49 results about "Continuous emissions monitoring system" patented technology

A system for generating electricity includes a generator and an interface. The generator is coupled to the interface and provides data to the interface regarding electricity generation. The interface is coupled to a control node for monitoring and controlling the generator. The control node may be coupled to the generator through a medium such as the internet. In some aspects of the invention, a continuous emissions monitoring system is provided for fossil-fuel based generators to enhance operation and reduce emissions of such generators.

A continuous emissions monitoring system is in fluid communication with a flue stack conducting exhaust gas from a combustion source. The continuous emissions monitor system comprises an analyzer for measuring concentrations of an analyte present in the exhaust gas. A probe is in fluid communication with the flue stack to acquire a sample of exhaust gas from the flue stack. The probe is also in fluid communication with and located upstream of the analyzer. The probe tends to remove analyte from the sample. A calibration checking system is in fluid communication with the probe. The calibration checking system includes a source that provides a flow of a known concentration of calibration material to be measured by the analyzer. The calibration material is the same as the analyte. A humidifier is associated with the source to provide moisture to a flow of calibration material. The moisture acts to cleanse removed analyte from the probe and thereby enable an accurate measurement of the concentration of the calibration material. A supply system is operatively connected with the humidifier to provide a desired amount of a liquid to the humidifier.

A continuous emissions monitoring system is in fluid communication with a flue stack conducting exhaust gas from a combustion source. The continuous emissions monitor system comprises an analyzer for measuring concentrations of an analyte present in the exhaust gas. A probe is in fluid communication with the flue stack to acquire a sample of exhaust gas from the flue stack. The probe is also in fluid communication with and located upstream of the analyzer. The probe tends to remove analyte from the sample. A calibration checking system is in fluid communication with the probe. The calibration checking system includes a source that provides a flow of a known concentration of calibration material to be measured by the analyzer. The calibration material is the same as the analyte. A humidifier is associated with the source to provide moisture to a flow of calibration material. The moisture acts to cleanse removed analyte from the probe and thereby enable an accurate measurement of the concentration of the calibration material.

The invention provides an ammonia spraying regulation automatic control method for a denitrification system of a thermal power plant. The method comprises the following steps of 1, using a DCS to conduct circular blowing control on sampling channels of CEMS (Continuous Emission Monitoring System) analyzers on an inlet and an outlet of each flue according to the number of flues of a same boiler; 2, acquiring the analysis values of the CEMS analyzers on the inlet and the outlet of the current flue in the process of blowing control, and adjusting the opening degree of an ammonia spraying door of the current flue according to a preset specific value relation; and 3, if the CEMS analyzers on the inlet and the outlet of the current flue are maintained or blown, replacing with the analysis values of CEMS analyzers on an inlet and an outlet of another flue. According to the provided CEMS analyzer blowing control method, the CEMS analyzers of the denitrification system can be automatically and orderly blown; besides, an automatic control strategy for ammonia spraying is designed for the blowing control method, and the blowing of the CEMS analyzers is controlled; and through the set logic switch, the ammonia spraying door is guaranteed to be constantly controllable, the undisturbed switching is guaranteed after blowing is finished, and the adjusting effect is improved.

Embodiments of the invention relate generally to systems used to measure mercury in gaseous emissions. In one aspect, the invention is directed to the use of an inert covalently bonded material selected from silicon carbide (SiC), silicon oxides (SiO_n, n=1-2), silicon nitride (e.g. Si₃N₄), silicon boride (e.g. SiB₆), boron nitride (e.g. BN) and mixtures thereof as material for a thermal pyrolysis unit. In another aspect, the invention is directed to an improved pyrolyzer design, in which a thermal pyrolysis unit comprises a tailpiece that allows water to be injected at the heated exit of the thermal pyrolysis unit. In another aspect, the invention is directed to the use of a coalescing filter in a scrubbing unit. In another aspect, the invention is directed to the use of a hydrophobic filter element in a scrubbing unit. One or more of these elements may be used in a conditioning module of a continuous emissions monitoring system, for example.

A converter of the Continuous Emission Monitoring System (CEMS) receives a gas sample containing vaporized mercury from a probe. The converter converts oxidized mercury present within the gas sample into an elemental mercury component and an oxidizing component using thermal cracking. The converter also reduces the pressure of the gas sample to minimize recombination of the elemental mercury component with the oxidizing components. A mercury analyzer of the system receives the reduced pressure gas sample from the converter and detects the fluorescence of the elemental mercury within the sample. The mercury analyzer holds the gas sample at the reduced pressure to reduce an effect of fluorescence quenching on the fluorescence of the elemental mercury within the sample and provides substantially accurate measurement of the concentration of the elemental mercury in the gas sample.

The invention discloses an intelligent fault detection device of a continuous emission monitoring system (CEMS). The intelligent fault detection device of the CEMS comprises a parameter acquisition unit, a data fault analysis unit, and a fault alarming unit, wherein the parameter collecting unit collects physical characteristic data and system data of each component of the CEMS through running a parameter acquisition sensor group, the data fault analysis unit analyzes a fault component and fault information of the fault component of the CEMS according to the physical characteristic data and system data collected by the parameter collecting unit, the fault alarming unit is connected with external devices or the network and is used for receiving fault information of the fault component generated by the data fault analysis unit and sends out a fault alarming signal. The intelligent fault detection device of the CMES can be widely applied to industries like thermal power plants, waste incineration power plants, chemical plants and paper-making. The intelligent fault detection device of the CMES can greatly improve operational stability of the CEMS, reduce manpower and material resources needed to operate the CEMS, and therefore the running cost and expense of the CEMS are reduced.

The invention discloses a method and a system for denitration control of a thermal power plant. The method comprises the following steps: calculating an O'clock every hour average value of NOX emission amount according to an NOX emission concentration value detected at a chimney by a CEMS (Continuous Emission Monitoring System); then judging whether the O'clock every hour average value is within apreset NOX emission threshold value range or not, increasing the ammonia spraying amount if the O'clock every hour average value is higher than a preset NOX emission threshold value, and reducing theammonia spraying amount if the O'clock every hour average value is smaller than the preset NOX emission threshold value. Compared with a traditional method for controlling the ammonia spraying amountaccording to an emitted NOX real-time concentration value, environment protection assessment standard can be met by just ensuring that the O'clock every hour average value accords with the preset NOXemission threshold value no matter how big an emitted NOX real-time concentration value is, the ammonia spraying amount can be accurately controlled on the premise that the NOX emission amount according with the environment protection requirements is ensured, and the situation that too much or too less ammonia is sprayed can be prevented from happening, so that the probability of blocking an airpre-heater is reduced, the resistance of a draught fan is reduced, and the overhauling cost is reduced.

The invention relates to a flue gas continuous monitoring electronic cooler which mainly comprises an acid and alkali resistance borosilicate glass tube 1, an aluminum-made aluminum core 2, a semiconductor cooling plate 3, a radiating fin 4, a closed plate 5, a cooling fan 6, a box body 7, a PID (PID control) temperature controller 8, a solid state relay 9 and a platinum resistance temperature sensor 10. The temperature of the acid and alkali resistance borosilicate glass tube 1 (namely flue gas to be tested) is accurately controlled by the PID (PID control) temperature controller 8. The PID (PID control) temperature controller 8 can set a temperature value, and has the functions of alarm, code setup, remote control, communication with other equipment, and the like. The device has the advantages of high efficiency, low energy consumption, low cost, little noise, small volume, light weight, no pollution, fast cold and hot exchange speed, high temperature control accuracy, and the like, is widely applied to the field of dewatering and drying treatment for exhaust source flue gas extracted by a fixed pollution source continuous monitor system.

The invention discloses an ultraviolet absorption measurement method for waste gas sulfur dioxide of a stationary pollution source. According to the method, an ultraviolet absorption method sulfur dioxide analyzer or multiple groups of gas analyzers with an ultraviolet absorption method sulfur dioxide analysis function is/are used as multiple monitors; sulfur dioxide is used for absorbing light with the characteristic wavelength of 240-330nm in a near ultraviolet light region, and the concentration of sulfur dioxide in waste gas is quantified according to the lambert-beer law; then the sulfur dioxide discharging rate is obtained by further calculation. An ultraviolet absorption method can adapt to wider measurement on SO2 discharged by the stationary source; by the method, the requirements on supervising monitoring on an on-site pollution source, comparison monitoring on a CEMS (continuous emission monitoring system) and checking of data effectiveness are met.

The invention discloses an intelligent denitration method and an intelligent denitration device for a spray drying tower. The device comprises a control system, a CEMS (continuous emission monitoring system) online monitoring module, a reducing agent conveying module, a reducing agent preparation module and a spray gun; the intelligent denitration method monitors the content of nitric oxide in the drying tower in real time through a CEMS, controls the system to control the whole denitration process, uses the intelligent spray gun to accurately control the use amount of a reducing agent, and prevents the excessive reducing agent from overflowing to corrode equipment, affect the product quality and pollute the environment; the method in the scheme can control the denitration operations of a plurality of spray drying towers at the same time through one control system, control in a combined manner, improve the working efficiency, reduce the launching of the equipment, and save the cost.

The invention relates to a CEMS (continuous emission monitoring system) sampling system for a horizontal flue at a main discharge port of a coal-fired unit. The CEMS sampling system comprises sampling branch pipes, back flushing electromagnetic valves, sampling electromagnetic valves, a mixing main pipe, flow regulating valves, a dilution unit and a probe controller. A plurality of groups of sampling branch pipes are arranged on the measuring section of a main discharge port flue, a plurality of sampling branch pipes form a group, the lengths of the sampling branch pipes in the same group are arranged in equal difference, and the tops of the sampling branch pipes are equal in height. Each sampling branch pipe is connected to the mixing main pipe through one sampling electromagnetic valve and one flow regulating valve in sequence, and the mixing main pipe is connected to a gas analyzer through the dilution unit and the probe controller in sequence. An outlet pipeline of each sampling branch pipe is connected with a back flushing pipeline, and a back flushing electromagnetic valve is arranged on the back flushing pipeline. The system and the method have the beneficial effects that multi-point sampling is performed at the main discharge port of the coal-fired unit, so that the problem of non-uniform pollutant concentration field caused by a flow field can be eliminated, and the defect that single-point measurement data cannot represent the overall pollutant discharge condition is overcome.