30results about How to "Reduce excess air ratio" patented technology

A combustion control apparatus operates an internal combustion engine in a split retard combustion mode during regenerating an exhaust purifier such as a particulate filter. In the split retard combustion mode, the combustion control apparatus controls a first fuel injection to cause preliminary combustion at or near top dead center, and controls a second fuel injection to cause main combustion after an end of the preliminary combustion. In this manner, the combustion control apparatus controls an exhaust gas temperature, or an exhaust air-fuel ratio, without increasing exhaust smoke. During the split retard combustion mode, the combustion control apparatus controls an EGR rate of the engine. The EGR rate in the split retard combustion mode is set lower than in the normal combustion mode, in each operating point of the engine.

The invention discloses a light roasting MgO suspension calcination production process and device. The device comprises a raw material cabin, a five-stage cyclone preheating tube, a suspension calcination furnace, three sets of combustion systems, a three-stage suspension cooling cylinder, a two-stage fluidized bed, a waste gas treatment device, a sleeve type water cooling spiral conveyor, a finished product cabin, a fan, a turning plate valve, a temperature detector and the like. The defects that the existing light calcination MgO calcination equipment has the narrow calcination temperature regulation range, the activity of the produced light calcination MgO product is single, collapse materials under the abnormal work conditions cannot be timely treated, the stable operation of the wholesystem is influenced, and the like are overcome. The combustion systems are arranged in the height direction and the radial direction of the suspension calcination furnace; the two-stage fluidized bed is arranged at the discharging opening of the suspension calcination furnace; the problem of the material collapse phenomenon occurring under the abnormal work conditions can be solved; meanwhile, the precise different-region calcination of the MgO with different activities can be realized; the popularization and application of the light calcination MgO in the building industry can be facilitated.

The invention discloses a stable and effective biomass pellet fuel combustion device and method. The stable and effective biomass pellet fuel combustion device comprises a combustion furnace shell, a primary air device, a secondary air device, an ignition device, a feed device, a burner, a heat exchange device, a stirring device and an ash tray. The stable and effective biomass pellet fuel combustion device and method are capable of guaranteeing the stable and effective combustion of the fuel and preventing slagging and caking in combustion so as to realize continuous stable combustion. The volatile component and fixed carbon in the biomass are burnt in two stages, the air quality is controlled, and the pollutant emission is lowered in combustion. The ignition device achieves low ignition energy consumption and low ignition pollutant emission; the combustion is safely isolated from stored materials; the stable and effective biomass pellet fuel combustion device and method have high energy conservation and emission reduction benefit and application value.

The invention provides an energy-saving method of an oxygenized air mixed blowing supporter combustion boiler and equipment used by the method, belonging to an energy-saving and emission-reduction combustion technology of the boiler; the invention more particularly relates to an efficient energy-saving combustion technology combining oxygenized air technology and supporter combustion technology and equipment thereof; the effects of energy-saving and emission-reduction of the invention are different according to the different running situations and equipment of the boiler (kiln); the statistics obtained from the cases studies of dozens of boilers and kilns proves that the lowest coal-saving ratio is 5.7%, the highest coal-saving ratio is 25%, and the coal-saving ratio of a pulverized coal fired boiler of 670t/h in a thermal power plant is 8.34%, so that the statistical data shows that the effects of energy-saving and emission-reduction of the technical improvement measure are excellent, the technology can be widely popularized, and good social and economical benefits can be brought about.

The invention discloses a process method for preparing active calcium oxide by oxygen-enriched calcination. The process method the following steps of firstly crushing and sieving raw limestone to enable the particle size of the raw limestone to be 10-55 mm, conveying the raw limestone into a stock bin with a circular cross section, wherein the stock bin is arranged at an upper part of a vertical preheater; then, uniformly conveying the raw materials in the stock bin into the vertical preheater through a blanking pipe, and preheating the raw materials by using high-temperature kiln gas and cooling gas of a vertical cooler; then, feeding the materials into a rotary kiln, and importing oxygen-enriched air from a kiln head to perform oxygen-enriched calcination; and then, feeding the calcium oxide obtained after calcination and decomposition into the vertical cooler to be cooled by air, namely, obtaining the active calcium oxide. According to the process method disclosed by the invention,through the integration of the processes of graded preheating, oxygen-enriched calcination, graded cooling, dynamic temperature monitoring and the like, and the raw materials are preheated by combining the high-temperature kiln gas and the high-temperature gas discharged from the cooler, the heat transfer efficiency of the system is greatly improved, the activity of calcium oxide is obviously improved, the energy consumption is reduced, and the energy conservation and emission reduction are realized.

The invention discloses a multi-gas mixed combustion boiler and a combustion method, and belongs to boilers and combustion methods. The multi-gas mixed combustion boiler structurally comprises a hearth, a hearth water cooling wall, a steam generating system, a platen superheater, a high-temperature superheater, a low-temperature superheater, a coal economizer, an air preheater and a gas preheater. A gas combustion stabilizer is arranged on the lower portion of the hearth, three layers of gas combustors are arranged on the outer side of the gas combustion stabilizer, and the outer sides of the three layers of gas combustors are respectively connected with three gas pipelines. The combustion method includes enabling various gases and air to proportionally flow into the hearth to be combusted; transmitting heat to the steam generating system; enabling saturated steam to flow through the superheaters and then heating the saturated steam to obtain superheated steam; enabling flue gas to flow through the superheaters; then preheating water by the aid of the coal economizer, and heating the flue gas by the air preheater and the coal preheater; finally exhausting the flue gas into the atmosphere. The flue gas is generated after fuel is combusted. The water is about to be fed to the boiler. The multi-gas mixed combustion boiler and the combustion method have the advantages that coke-oven gas, blast-furnace gas and converter gas can be combusted by the aid of the multi-gas mixed combustion boiler and the combustion method; a large quantity of energy can be saved, severe environmental pollution due to gas emission can be prevented, the production cost can be reduced, and the like.

The invention discloses a pulverized coal co-combustion system of an industrial boiler. With the system, layer combustion and suspension combustion can form in a furnace. The system includes a boiler, a raw coal supply device and a co-combustion device. The boiler comprises a furnace, a coal inlet located at the lower part of a front end wall, and a chain grate disposed at the lower part of a furnace inner chamber. The raw coal supply device is connected to the coal inlet through a coal hopper. The co-combustion device is arranged at the boiler tail, and is composed of a boiler-front mill, a pulverized coal combustor and a pulverized coal conveying pipe. The boiler-front mill includes a rotation shaft running through a primary milling chamber, an intermediate milling chamber and a fine milling chamber connected in order, a primary hammer type impeller, an intermediate hammer type impeller and a final hammer type impeller. The front end wall upper part of the primary milling chamber is provided with a coal inlet, and the chamber wall upper part of the fine milling chamber is provided with a pulverized coal nozzle. The pulverized coal combustor includes a combustor body and a combustion nozzle. The combustor body is equipped with a secondary air inlet and a pulverized coal inlet. And the pulverized coal conveying pipe connects the pulverized coal inlet of the combustor body and the pulverized coal nozzle of the boiler-front mill.

The invention discloses an energy conservation and emission reduction modification method for reducing the emission load of nitric oxide of a DDF cement decomposing furnace. By arranging an air gathering bellows and a gooseneck pipe on the DDF decomposing furnace with the small volume, the smoke standing time is prolonged; part of coal powder is distributed to the conical portion of the decomposing furnace, part of tertiary air is distributed to the upper middle portion of the decomposing furnace, the volume of the DDF decomposing furnace is enlarged, the position of part of coal powder entering the furnace is reduced, and the coal powder burn-off rate is improved. The coefficient of excess air in the lower middle portion of the decomposing furnace is smaller than 1.0. Under the condition of insufficient oxygen, CO of a large proportion is generated to become reducing agents for reducing and eliminating nitric oxide. An ash returning channel is arranged inside the air gathering bellows and feeds raw materials and coal powder particles subsided back to the position above a middle nozzle of the decomposing furnace, so that the problem of sintering blockage of accumulated ash is solved, the coarse particle processing capacity of the decomposing furnace is improved, the decomposition rate of raw materials entering the furnace is improved, and through the double effects of reducing emission of nitric oxide and reducing heat loss, the effective energy conservation and emission reduction of a cement calcining system are achieved.

The invention discloses a full-premixing type condensation type steam generator. Gas communicates with a gas inlet of a premixing cavity through a proportional valve. Air communicates with an air inlet of the premixing cavity through an air filter. The premixing cavity is connected with a draught fan inlet. A draught fan outlet is connected with a mixer. A mixer outlet is connected with a combustor. After being ignited, mixed gas enters an S-shaped heat exchange coil pipe arranged in a combustion barrel, and an outlet of the S-shaped heat exchange coil pipe in the combustion barrel communicates with a secondary heat exchanger through a smoke guide-out pipe. The top and the bottom of an auxiliary water tank communicate with water supplementing pipes at the top and the bottom of the combustion barrel correspondingly. Three water level sensors are arranged in the auxiliary water tank so as to induct the high water level, the middle water level and the low water level in the combustion barrel. A full-premixing combustion structure is adopted in the combustion barrel, meanwhile, the secondary heat exchanger is utilized for conducting condensation heat exchange on high-temperature smoke,gas and a certain amount of air are sufficiently mixed before combustion, the flame propagation velocity is high, the excess air coefficient is very small, heat efficiency is effectively improved, and emission of pollutants is reduced.

The invention belongs to the technical field of air separation, and particularly relates to a cement plant kiln on-site oxygen production and gas supply device and method. A membrane separation oxygen production technology is organically coupled to an original compressed air gas supply facility, and original compressed air is separated into two kinds of gas, rich nitrogen and rich oxygen; the generated rich nitrogen directly replaces the compressed air demand of an original factory, and compression energy is recycled; the generated rich oxygen can be sent to a furnace kiln to directly completely or partially replace original clean air and coal air to carry out oxygen-enriched combustion, the compression energy of a fan is recycled, and additional economic benefits are obtained due to oxygen-enriched combustion; the extreme condition of compressed air use is fully considered, a standby compressed air compensation loop is adopted for flow compensation, the oxygen supply scheme that oxygen is replaced with compressed air is achieved on the whole, and energy consumption of oxygen extraction is greatly reduced; and the equipment management and maintenance cost is low, potential safety hazards are avoided, and a preferred scheme for oxygen-enriched combustion energy-saving transformation of a cement plant is achieved.

The invention discloses a furnace tube installation and fixing method applied to a hydrocarbon-steam conversion hydrogen production conversion furnace. The method is used for sealing connection between a plurality of rows of arranged furnace tubes and a conversion furnace body; the furnace tubes vertically penetrate through and extends out of a furnace top plate and a furnace bottom plate of the conversion furnace body; one end, stretching downwards out of the furnace bottom plate, of each furnace tube is provided with a fixing supporting piece for preventing the furnace tube from extending downwards or swinging transversely due to thermal expansion; and each fixing supporting piece is fixedly connected with a steel structure at the furnace bottom. According to the method, transverse displacement of the furnace tubes due to thermal expansion and extension of a lower gas collection tube is avoided, and coaxiality of the furnace tubes with the furnace top plate and a furnace bottom sealing structure can be guaranteed to the maximum extent, so that heat efficiency of the conversion furnace is improved, welding seam cracking caused by thermal expansion is avoided, and production safetyis ensured.

The invention discloses a high-activity MgO roasting technology and device. The roasting technology comprises the following steps: firstly, enabling magnesium carbonate powder and hot air to be in contact and mixed to absorb heat, and pre-heating the material until the temperature is about 350 DEG C; then carrying out cyclone calcination and calcining and decomposing in a temperature range of 800DEG C to 1000 DEG C to obtain an MgO and CO2 mixture; conveying the cooled MgO and CO2 mixture into a separation device and carrying out gas-material separation; conveying collected powder into a finished-product cabin and storing; after treating escaped waste gas through a water gas treatment device, discharging the waste gas into the atmosphere through a chimney. According to the high-activity MgO roasting technology and device, disclosed by the invention, the disadvantages of an existing high-activity MgO calcination device of large equipment investment, short running period, large repairing strength, high heat consumption and great product quality fluctuation are changed and the High-activity MgO roasting technology and the special device thereof are developed; the device has the advantages of less investment, simple equipment, long service life, low repairing difficulty, low firing heat consumption and good product activity stability.

The invention relates to the technical field of thermal power engineering and particularly relates to a furnace oxygen-enriched catalyzing combustion supporting method and device. According to the furnace oxygen-enriched catalyzing combustion supporting method and device, oxygen-enriched air and catalyzing combustion are combined; oxygen-enriched air with the purity being 21-60% is directly made from air through a normal temperature air separation method; a catalyst is dissolved, enters a water solution and is used for stimulating singlet oxygen; and air or the made oxygen-enriched air servesas a gas source to jet the catalyst solution and is fed into a furnace along with fuel to carry out oxygen-enriched catalyzing combustion. The device comprises an oxygen extracting device, a catalystdissolving, stirring and pressurizing device and an oxygen-enriched jetting and atomizing device. According to the furnace oxygen-enriched catalyzing combustion supporting method and device, the essence is to getting energy from oxygen instead of fuels such as coal, methane and oil; and besides, the requirements for the flow and purity on an oxygen source is greatly lowered, the investment of oxygen equipment and operation maintaining cost of the equipment are greatly reduced, especially the energy consumption of oxygen generating plants is reduced, and significant economic benefits are achieved.

The invention discloses a combustion system and method of an inverted-alpha shaped flame air distribution type layered boiler, and belongs to the technical field of boilers. The combustion system comprises a front arch, a rear arch, a fire grate and an air distribution system, wherein the front arch and the rear arch are separately arranged aslant; the top height of the front arch is less than that of the rear arch; the rear arch is shorter than the front arch; an included angle of the front arch and the rear arch is an obtuse angle; the front arch, the rear arch and a partitioning plate are divided into a front zone and a rear zone, the front zone is a combustion zone and the rear zone is a cooling area; the air distribution system comprises a main pipe, air blowers, a fume exhaust pipe and a plurality of air distribution pipes; the fume exhaust pipe and one end of each of the plurality of air distribution pipes are connected with the main pipe; the other end of each of the pluralityof air distribution pipes extends into a combustion chamber from the front arch or the rear arch; an adjusting valve is arranged on the each air distribution pipe; the other end of the fume exhaust pipe extends into a cooling fume exhaust zone, the main pipe communicates with an air pre-heater of an existing boiler; and the air blowers are separately arranged on the main pipe and the fume exhaustpipe. According to the system and the method disclosed by the invention, generation of nitrogen oxide can be reduced, and fume exhaustion loss is reduced.

The invention discloses a burner. The burner comprises an outer ring burning assembly, an inner ring burning assembly and a furnace end for supplying gas to the outer ring burning assembly and the inner ring burning assembly, and further comprises a heat gathering ring of a cylindrical structure, wherein the heat gathering ring is arranged between the outer ring burning assembly and the inner ringburning assembly. The heat gathering ring is arranged on the periphery of the inner ring burning assembly in a sleeving manner, an inner ring gap is formed between the heat gathering ring and the inner ring burning assembly, and an outer ring gap is formed between the heat gathering ring and the outer ring burning assembly. An air supplementing gap is formed between the bottom of the outer ring burning assembly and a cooking bench and communicates with the inner ring gap and the outer ring gap. According to the burner, because the heat gathering ring is used instead of a heat gathering disc,the cost of the burner is reduced on the basis of ensuring that heat can be gathered to improve the heat efficiency.

The invention discloses a composite combustion circulating fluidized bed. The composite combustion circulating fluidized bed comprises an automatic control electric cabinet, a pulverizer, a hearth ofthe fluidized bed, a chimney, a flue for connecting the chimney and the hearth, hot air pipes, a powder pipe and a gas-powder mixing structure. The powder pipe comprises a main powder pipe and a branch powder pipe, and the main powder pipe is connected with the pulverizer and the branch powder pipe. One hot air pipe is communicated with the pulverizer and the flue, and the other two hot air pipesconnect the flue with the gas-powder mixing structure. The gas-powder mixing structure is used for mixing powder conveyed by the branch powder pipe and high-temperature flue gas conveyed by the hot air pipes and then spraying the mixture onto the two sides of the hearth. The flue is communicated with the chimney through an induced draft fan, the chimney is provided with an oxygen meter used for detecting the oxygen content in exhausted waste gas, and the hearth is further provided with a steam pressure meter used for detecting the steam pressure in the hearth. And the automatic control electric cabinet is respectively connected with the pulverizer, the gas-powder mixing structure, the induced draft fan, the steam pressure meter and the oxygen meter. The composite combustion circulating fluidized bed has the advantages of high combustion intensity, high temperature rise speed and high heat efficiency.