35results about How to "Reduce NOx concentration" patented technology

The invention discloses an ultra-supercritical boiler closed-loop combustion optimal control method; based on a combustion system dynamic model built by an untracked Kalman filtering least squares support vector machine, the boiler efficiency and the dynamic characteristics of NOx emission changed along with loads can be accurately reflected; and meanwhile, through introduction of updating mechanisms, the excellent self-adaption capacity and prediction capacity of the dynamic model under different working conditions are also guaranteed. When the load of a 1000 MW fired coal boiler is variableor stable, and the adjusting quantity, the controlled index and related parameters are all located in a reasonable range and stably changed, the boiler efficiency can be kept stable; and meanwhile, after SCR inlet conversion, the NOx concentration is obviously reduced after application.

The invention provides a flue structure for SNCR (selective non-catalytic reduction) denitration of flue gas of a pulverized coal boiler and heating of sludge drying heat-conducting oil. An SNCR denitration device is arranged in a proper area in a flue of the pulverized coal boiler, so that the flue gas carrying a reducing agent can be fully mixed when flowing through the SNCR denitration device,and ideal denitration efficiency is achieved. A heat-conducting oil heater pipeline is embedded in a basic mechanism unit, so that a heat-conducting oil heating system is simplified, and part of heatenergy in high-temperature flue gas is obtained for drying of municipal sludge. The whole design structure is simple, the concentration of NOx in the flue gas in front of an SCR device is greatly reduced, energy in the flue gas is obtained with the simple structure for drying of the municipal sludge, and better economic benefits and social benefits can be obtained in two aspects of pollutant emission reduction and municipal waste utilization.

The invention discloses a heat-storage-type burning device which comprises a furnace body, a burner block part, a furnace wall connecting member, a heat storage chamber, a combustible gas incoming pipe, an air-gas connecting body and an igniter. The burner block part comprises a burner block pouring material and a metal plate, an air nozzle and multiple combustible gas nozzles are arranged on the burner block pouring material, the combustible gas nozzles are arranged in a manner of surrounding the air nozzle, and the metal plate sleeves the burner block pouring material and is connected with the same through an anchoring hook. By the heat-storage-type burning device, reductive in-furnace atmosphere can be generated, and an in-furnace temperature field is more uniform, so that oxidation burning loss of the surface of a workpiece is reduced; uniformity of the in-furnace temperature field ensures integral balance uniformity in heating of the workpiece, so that quality of a heated workpiece is improved, and service life of the burner block part is prolonged. Due to porous and hierarchic burning, high-temperature oxygen-deficient burning can be realized, NOx concentration in the process of burning is lowered remarkably, oxidation burning loss of melting products is reduced, and energy conservation and environment protection are realized.

The invention relates to a refuse landfill gas burning and re-burning technology, and in particular relates to a method and a treatment system for reducing nitrogen oxides by using incineration of refuse landfill gas. The treatment system mainly consists of a refuse landfill, an air pipe, a fan, the other air pipe and an incinerator connected sequentially; during working, the landfill gas of the refuse landfill is led out by the fan through the air pipe, delivered to the incinerator through the other air pipe, and burnt and re-burnt by the incinerator; and the landfill gas is used for reducing NOx in the incinerator, so that the NOx content of the flue gas exhausted by the incinerator is effectively reduced. The method and the system solve the problem of air pollution caused by stench of the refuse landfill and the problem of NOx concentration in the flue gas exhausted by the refuse incinerator, and are particularly suitable for a newly built refuse power plant, particularly a refuse burning power plant which is built nearby the refuse landfill and can provide the landfill gas more conveniently and effectively.

[PROBLEM] To provide a construction machine capable of performing necessary operation or operations without a difficulty even when a remaining amount of a reducing agent becomes small. [SOLUTION] In a hydraulic excavator having an engine, a hydraulic cylinder (18), plural actuators including a hydraulic motor (29), and an exhaust gas treatment system for subjecting, to purification treatment, nitrogen oxides in exhaust gas from the engine, the hydraulic excavator is provided with an actuator operation control means for performing, when the remaining amount of the reducing agent in a reducing agent storage tank (30) is detected by a remaining reducing-agent amount detector (33) to have become equal to or smaller than a predetermined remaining amount, limiting control to limit an operation of the hydraulic cylinder (18) such that a front working implement driven by the hydraulic cylinder (18) becomes difficult to exhibit its function, and at a same time, holding control for holding the hydraulic motor (20) operable such that a function of a travel base (1) or swing upperstructure (3) driven by the hydraulic motor (20) can be exhibited.

The invention discloses a heat-storage-type burning device which comprises a furnace body, a burner block part, a furnace wall connecting member, a heat storage chamber, a combustible gas incoming pipe, an air-gas connecting body and an igniter. The burner block part comprises a burner block pouring material and a metal plate, an air nozzle and multiple combustible gas nozzles are arranged on the burner block pouring material, the combustible gas nozzles are arranged in a manner of surrounding the air nozzle, and the metal plate sleeves the burner block pouring material and is connected with the same through an anchoring hook. By the heat-storage-type burning device, reductive in-furnace atmosphere can be generated, and an in-furnace temperature field is more uniform, so that oxidation burning loss of the surface of a workpiece is reduced; uniformity of the in-furnace temperature field ensures integral balance uniformity in heating of the workpiece, so that quality of a heated workpiece is improved, and service life of the burner block part is prolonged. Due to porous and hierarchic burning, high-temperature oxygen-deficient burning can be realized, NOx concentration in the process of burning is lowered remarkably, oxidation burning loss of melting products is reduced, and energy conservation and environment protection are realized.

The invention discloses a burner. The burner comprises a body, wherein a flame outlet, a combustion-supporting gas inlet connector and a gas inlet connector are arranged on the surface of the body, an inner cavity main body is arranged inside the body and comprises a combustion chamber, an air-fuel flow guide body cavity and a gas inlet channel, the combustion chamber communicates with the flame outlet, the gas inlet channel communicates with the gas inlet connector, the air-fuel flow guide body cavity and the gas inlet channel both communicate with the combustion chamber, the combustion-supporting gas inlet connector communicates with the air-fuel flow guide body cavity, the gas inlet channel comprises a first-stage gas channel and a plurality of second-stage gas channels annularly arranged on the periphery of the first-stage gas channel, and the second-stage gas channels communicate through an annular channel arranged on the periphery of the first-stage gas channel in a sleeve mode. The invention provides a burner which is provided with the gas channels with multiple flow levels, ignition is conducted through the minimum flow by the burner, then the supply amount of gas is gradually increased, and the situation that ignition is difficult or ignition deflagration occurs can be effectively avoided.

Methods of treating exhaust in a vehicle, and exhaust systems for a vehicle, are disclosed. Example methods may include providing a catalytic converter in an exhaust tailpipe and an oxygen sensor downstream of the catalytic converter. The catalytic converter may be configured to reduce a concentration of a nitrogen oxide (NOx) present in an exhaust flow through the catalytic converter. The methodfurther includes predicting an increase in an oxygen concentration within the catalytic converter based upon at least one or more real-time vehicle operating parameters, wherein the increase is predicted before a corresponding increase in oxygen concentration is measured by the downstream oxygen sensor. The method may also include adjusting an air-fuel ratio of an engine of the vehicle based uponthe predicted increase in oxygen concentration, thereby at least partially preventing the corresponding increase in the oxygen concentration.

The invention discloses a burner which comprises a body, wherein a flame outlet, a combustion-supporting gas inlet connector and a fuel gas inlet connector are arranged on the surface of the body, an inner cavity main body is arranged in the body and comprises a combustion chamber, an air-fuel flow guide body cavity and a fuel gas inlet channel, the combustion chamber is communicated with the flame outlet, the gas inlet channel is communicated with the gas inlet connector, the air-fuel flow guide body cavity and the fuel gas inlet channel are both communicated with the combustion chamber, the combustion-supporting gas inlet connector is communicated with the air-fuel flow guide body cavity, the fuel gas inlet channel comprises a first-stage gas channel and a plurality of second-stage gas channels annularly arranged on the periphery of the first-stage gas channel, and the second-stage gas channels are communicated through an annular channel arranged on the periphery of the first-stage gas channel in a sleeving mode. The disclosed burner is provided with gas channels with multiple flow levels, ignition is conducted through the minimum flow, then the supply amount of gas is gradually increased, and the situation that ignition is difficult or ignition deflagration occurs can be effectively avoided.

The invention discloses a supercritical carbon dioxide coal-fired boiler denitrification, desulfurization and dust removal integrated system, which belongs to the technical field of NOx emission reduction. The boiler unit of the present invention is equipped with a multi-stage ammonia injection denitrification device to realize graded denitrification in the furnace, and the dust removal and denitrification unit can denitrify and remove dust again through selective catalytic reduction reaction; the combustion in the low-temperature flue gas recirculation mode can effectively reduce the temperature in the furnace and reduce the Thermal NOx generation reduces the concentration of NOx emitted from the furnace tail. At the same time, because the oxygen concentration of the recirculated flue gas is reduced, it is beneficial to meet the annular high-temperature and low-oxygen reduction zone formed by the ammonia injection burner, thereby realizing the deep denitrification of supercritical carbon dioxide coal-fired boilers. . The invention overcomes the insufficient denitrification degree caused by the high temperature of the supercritical carbon dioxide coal-fired boiler, can combine the three-stage ammonia injection denitrification process with the dust removal desulfurization and denitrification process, and denitrifies the flue gas cycle, realizing the integration of desulfurization, dust removal and denitrification.

The invention relates to a biomass briquette hot water boiler system. The biomass briquette hot water boiler system is characterized by comprising a boiler, a water circulation system, a fire grate and combustion system, a heat transfer system, a briquette fuel feeding system, a dust removal system, an induced draught system, a flue gas recirculation system, a solar photovoltaic power system and a control system; fuel in the briquette fuel feeding system enters the fire grate and combustion system through a feeding opening in the lower end of the boiler and is used for combustion, high-temperature flue gas generated during combustion heats low-temperature water in the water circulation system through the heat transfer system, the heated high-temperature water is conveyed to a glasshouse, the low-temperature flue gas enters the dust removal system through a smoke outlet of the heat transfer system, the flue gas obtained after dust removal is conducted through the dust removal system is extracted by the induced draught system, part of the flue gas is exhausted through a chimney, the other part of the flue gas enters the fire gate and combustion system through the flue gas recirculation system, and furthermore a small part of flue gas is extracted and used for supplementing carbon dioxide required by the photosynthesis of crops to the glasshouse. The biomass briquette hot water boiler system can be widely applied to a renewable energy source heating system.

[Problem] To reduce the NOx concentration in cement kiln exhaust gas. [Solution] A cement firing device 1 is equipped with a plurality of denitrification burners 14 (14A to 14D) which are provided atthe kiln inlet 4 of a cement kiln 5 and inject, into the kiln inlet, combustion air and a fuel F3 in an overall amount of between 50% and 100% of the fuel F2 being burned in a precalcination oven 3 installed on the cement kiln. Increasing the fuel injected into the kiln inlet increases the amount of reducing agent, while causing the influence from the kiln inlet O2 to be mostly lost, allowing theNOx concentration in the kiln exhaust gas to be reduced further. The provision of a plurality of denitrification burners allows for a reduction in the injection amount per denitrification burner, theprevention of coating adhesion and fuel-to-fuel collision, and a higher probability of the injected fuel mixing with the kiln exhaust gas flowing in the kiln inlet and colliding with the NOx in the kiln exhaust gas. Providing the plurality of denitrification burners in the same horizontal plane further increases the probability of colliding with the NOx in the kiln exhaust gas.

The present invention provides a nuisanceless multistage far-infrared radiation machine with less heat loss of exhaust gas. A far infrared rays radiating tube at the outlet port of combustion gas of a catalyst combustion device of a burner of the multistage far-infrared radiation machine, is connected in series to one or two heat generating units, provided with a far infrared rays radiating tube at the combustion gas outlet port of a burner combustion device.

The invention relates to a method for purifying nitrogen-containing oxide tail gas. In a static supergravity-ultrasonic reaction absorption device, air is used as an oxidant, NOx-containing oxide tail gas and a denitration solution perform contact reaction at the room temperature. The NOx removing process can be quickly and efficiently completed, so that the NOx concentration in the tail gas is reduced to be 30 mg / m<3> or below. The method is suitable for various NOx-containing treatments.

The invention discloses a deep denitrification process for a supercritical carbon dioxide coal-fired boiler, which belongs to the technical field of NOx emission reduction. The present invention includes three-stage ammonia injection denitrification: the ammonia injection burner is used to inject fuel and ammonia reductant to the main combustion area of ​​the burner in the furnace respectively to form an annular high-temperature and low-oxygen reduction area with a temperature of 850-1400°C, where the reduction reaction takes place Realize the first-level denitrification; the second-level ammonia injection device and the third-level ammonia injection device spray ammonia reductant to the main combustion zone above the high-temperature and low-oxygen reduction zone and the burnout zone after the burn-out air to realize the second-level and third-level denitrification; dust removal Desulfurization and denitrification: After the flue gas is denitrated by SCR in the dust removal and denitrification unit, it is cooled to 70-90°C and then sent to the furnace for cyclic denitrification treatment. The present invention overcomes the deficiency of insufficient denitrification degree caused by high temperature of supercritical carbon dioxide coal-fired boilers. The three-stage ammonia injection denitrification process realizes deep graded denitrification in the furnace, and the recirculation combustion of low-temperature flue gas effectively reduces the temperature in the furnace, reduces the generation of thermal NOx, and realizes Supercritical carbon dioxide coal-fired boiler deep denitrification.