36results about How to "Achieve low nitrogen combustion" patented technology

The invention discloses an ultralow boiler smoke emission device. The ultralow boiler smoke emission device comprises a coal fired boiler, a denitration reactor, a bag type dust remover and a desulfuration tower. The coal fired boiler comprises a hearth, a main combustor and a flue. The main combustor is arranged at the lower portion of the hearth. Two layers of over fire air spraying ports are formed in the upper portion of the hearth. A smoke guide-out pipeline and a smoke guide-in pipeline are arranged between a previous-level economizer and a previous-level air pre-heater in the flue and are connected with an inlet and an outlet of the denitration reactor correspondingly, and an outlet of the flue is sequentially connected with the bag type dust remover and the desulfuration tower. The desulfuration tower is internally provided with a washing section, an absorption section and a mist removing section from bottom to top. Two water washing spraying layers are arranged above the absorption section, and a PP filler layer is arranged between the upper water washing spraying layer and the lower water washing spraying layer. The mist removing section is sequentially provided with a pipe type mist remover and a ridge mist remover from bottom to top. By means of the ultralow boiler smoke emission device, the content of NOX, SO2 and soot in the boiler smoke can be reduced, the national ultralow emission standard is met, and long-period running target of the device is achieved.

The invention discloses an automatic control method for preventing extinguishment and realizing ideal combustion for a hearth. The automatic control method is implemented by the aid of a full hearth control unit, signals inputted into the full hearth control unit at least include center temperature signals of various flame layers, given load signals of a boiler and starting and stopping state signals of various nozzles or pulverizing systems, automatic control operation is carried out inside the full hearth control unit, and signals outputted after automatic control operation at least include one type of fuel quantity instructions or fuel quantity correcting instructions of the various layers, air distribution quantity instructions or air distribution quantity correcting instructions of the various layers, oil feed combustion stabilizing instructions and total heat exchange energy signals generated during combustion of the hearth. The automatic control method has the advantages that the fuel coal quantity of the boiler and air quantities of the combustion nozzles can be adjusted automatically, excessively high temperature of the inside of the hearth is prevented, the boiler keeps in a stable combustion state, the extinguishment condition is stopped, the automatic control method is safe and convenient, and accordingly purposes of preventing extinguishment and realizing ideal low-nitrogen combustion are achieved for the hearth.

The invention relates to a method for adjusting low-nitrogen emission of a reheating coke oven. The method comprises the following steps: (1) adjusting bricks are arranged according to a lean gas heating mode; (2) when rich gas is adopted for heating, the air outlets and / or lean gas outlets of one or more sections in a vertical flame path are blocked by the adjusting bricks, so the amount of combustion-supporting air entering the bottom, the middle and the upper part of the vertical flame path can be independently and quantitatively adjusted, and low-nitrogen emission during rich gas heating is realized; and (3) when lean gas is adopted for heating, the adjusting bricks used for blocking the air outlets or the lean gas outlets in the step (2) are moved away, the initial state that the adjusting bricks are arranged according to the lean gas heating mode is recovered, and low-nitrogen emission during lean gas heating is achieved. According to the invention, one or more segmented outlets of air or lean gas in the vertical flame path are opened or closed, so the reheating coke oven which conducts segmented heating can realize low-nitrogen combustion no matter lean gas heating or rich gas heating is adopted.

The invention discloses a low-nitrogen hot water boiler with a replaceable sleeve type water-cooling burning head. The boiler comprises a combustion chamber and the sleeve type water-cooling burning head arranged at a fuel gas inlet of the combustion chamber, the sleeve type water-cooling burning head comprises a porous graphite burning head and a water cooling part, and the porous graphite burning head comprises an opening section and a double-layer graphite thin cylinder section; the opening section is arranged outside the combustion chamber, the double-layer graphite thin cylinder section is arranged inside the combustion chamber, and multiple rows of through holes are formed in the double-layer graphite thin cylinder section in the length direction; one end of the water cooling part is arranged on the opening section of the porous graphite burning head in a sleeving manner, the other end of the water cooling part is arranged at the outer side of the double-layer graphite thin cylinder section in the length direction and connected with a metal baffle, and the water cooling part is detachably connected with the outer wall of the combustion chamber; and according to the low-nitrogen hot water boiler, the difficulty in checking and replacing a water cooling pipe in the long-term service process of a water cooling combustor is overcome, meanwhile, the effects of treating the combusted flue gas, recycling the heat of the flue gas and reducing the content of pollutants in the flue gas are achieved, and the clean low-nitrogen combustion effect is achieved.

The invention is applicable to the technical field of agriculture, and provides a combustion device, a biomass fuel gasification direct-combustion boiler and an incineration method. The combustion device comprises a furnace body forming a fuel combustion space; a pellet fuel hopper used for storing pellet fuel and forming uniform discharging arrangement; a porous feeding hole used for feeding thepellet fuel and preventing cold air from entering the furnace body; a fire grate arranged below the pellet fuel hopper and used for bearing and conveying materials so as to enable the fuel to be dried, distilled and combusted at the upper part of the fire grate; an air preheater communicating with the furnace body and used for feeding heated air into the furnace body and increasing the temperatureof combustible air; a slag remover arranged at the bottom of the furnace body at the tail end of the fire grate and used for conveying ash slags to the outside of the furnace body; and an electric control room for controlling all driving pieces to automatically operate. The combustion device, the biomass fuel gasification direct-combustion boiler and the incineration method provided by the invention have the advantage that biomass bales are directly gasified and combusted; and the application capacity is high, the sufficiency in combustion is realized, the heat exchange efficiency is high, the heat dissipation is reduced, and dust accumulation is avoided.

The invention discloses an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method, including a coal mill, an air box, a first powder feeding pipeline, a direct current burner, a powder feeding pipeline reversing valve, and a secondary air adjustment Valve, preheating and deswirling burner, boiler furnace, secondary air duct and main burner; the center height of the nozzle of the preheating and deswirling burner is the same as the height of the nozzle of the direct-flow burner on the floor; the coal mill passes through the first The powder feeding pipeline is connected to the direct-flow burner and the preheating deswirl burner, the preheating deswirl burner is installed on the front and rear walls of the boiler furnace, and the air box is arranged on the side adjacent to the boiler furnace where the preheating deswirl burner is installed On the wall, the air box is connected with the direct-flow burner and the preheating solution swirl burner; it can make the pulverized coal undergo low-temperature pyrolysis in the pre-combustion chamber of the preheating solution swirl burner, and the pyrolysis product is mixed with the external secondary air, and then Spray into the boiler furnace for stable combustion, ensure the stable operation of the boiler under ultra-low load, and meet the needs of deep peak regulation.

The invention discloses a semi-coke powder circulating fluidized bed boiler based on material and heat balance. The semi-coke powder circulating fluidized bed boiler comprises a boiler body and a tailflue, wherein the boiler body and the tail flue are connected through a cyclone separator, a fluidized air distribution bed for supplying primary air is arranged at the bottom of the boiler body, a secondary air distribution device used for supplying secondary air is arranged on the side wall of the boiler body, the separation efficiency of the cyclone separator is not lower than 99.8%, the secondary air distribution device is provided with an upper secondary tuyere and a lower secondary tuyere, and a hearth of the boiler body is divided into a first zone, a second zone, a third zone and a fourth zone. According to the semi-coke powder circulating fluidized bed boiler based on material and heat balance, stable and efficient combustion of pure semi-coke powder can be realized on the premise of low-sulfur and low-nitrogen discharge.

The invention discloses a multi-stage adjustable low-nitrogen gas burner suitable for coke oven gas. A rotational flow device is arranged between a secondary fuel barrel and a burner box shell; a combustion air inlet is formed in the side face of the burner box shell; a combustion air baffle is arranged at the combustion air inlet; the combustion air inlet is divided into two paths, wherein one path communicates with a center air barrel through a center air adjusting valve, and the other path communicates with the burner box shell; a gas fuel inlet is formed in the outer side of the burner boxshell; a main gas fuel adjusting baffle is arranged at the gas fuel inlet; and the gas fuel inlet is divided into three paths, wherein the first path communicates with a center fuel barrel through acenter fuel adjusting valve, the second path communicates with a primary fuel barrel through an adjusting device, and the third path communicates with the secondary fuel barrel. The burner can meet the emission standard.

The invention discloses an automatic control method for preventing extinguishment and realizing ideal combustion for a hearth. The automatic control method is implemented by the aid of a full hearth control unit, signals inputted into the full hearth control unit at least include center temperature signals of various flame layers, given load signals of a boiler and starting and stopping state signals of various nozzles or pulverizing systems, automatic control operation is carried out inside the full hearth control unit, and signals outputted after automatic control operation at least include one type of fuel quantity instructions or fuel quantity correcting instructions of the various layers, air distribution quantity instructions or air distribution quantity correcting instructions of the various layers, oil feed combustion stabilizing instructions and total heat exchange energy signals generated during combustion of the hearth. The automatic control method has the advantages that the fuel coal quantity of the boiler and air quantities of the combustion nozzles can be adjusted automatically, excessively high temperature of the inside of the hearth is prevented, the boiler keeps in a stable combustion state, the extinguishment condition is stopped, the automatic control method is safe and convenient, and accordingly purposes of preventing extinguishment and realizing ideal low-nitrogen combustion are achieved for the hearth.

The invention provides a separating and returning adjusting and controlling system of a low-emission type circulating fluidized bed boiler and an integrated method. The separating and returning adjusting and controlling system of the low-emission type circulating fluidized bed boiler comprises a hearth, a separation device, a returning device, a slag discharging pipe, a slag discharging adjustmentvalve, a slag cooler, a coal slag discharging pipe, a coal slag discharge adjusting valve, a coal slag cooler, an ash discharging pipe, an ash discharging adjusting valve, an ash cooling machine anda coal slag removing machine. The inlet end of the ash discharging pipe extends into an air chamber to communicate with the bottom of a returning valve. The position of a moving cylinder is adjusted in a fixed cylinder. The integration method comprises the steps of firstly, under the condition that the load of the boiler descends or the caloric value of the fuel of the boiler descends, conductingfuel combustion and smoke and ash separation; and secondly, discharging the coal slag. According to the separating and returning adjusting and controlling system of the low-emission type circulatingfluidized bed boiler and the integrated method, by means of independent control over the amounts of separated ash and returning ash, discharging coal slag and discharging ash or integrated control over the amounts of separated ash and returning ash, discharging coal slag and discharging ash, the amount of separated ash, the amount of returning ash and the bed material of a bed hearth can be adjusted when the boiler is under a low load or fuel suddenly changes, so that the temperature field in the hearth is reasonable and uniform, the boiler can operate stably, stably and efficiently for a longtime, and ultra-low emission of NOX and SO2pollutans is achieved.

The invention discloses a low-nitrogen combustion circulating fluidized bed boiler and a using method thereof. The low-nitrogen combustion circulating fluidized bed boiler comprises a furnace, an airinlet system, a separating system and a coal inlet system, wherein the air inlet system involves an air inlet pipe, a primary air inlet device and a secondary air inlet pipeline system, the air inletpipe is connected with the primary air inlet device and the secondary air inlet pipeline system, and the primary air inlet device is arranged at the lower end of the furnace; the primary air inlet device is internally provided with a primary air inlet pipe, an air inlet buffer and an air distribution plate, and the primary air inlet pipe communicates with a primary air combustion area; and the secondary air inlet pipeline system communicates to a secondary air combustion area, and the secondary air combustion area is located downstream the primary air combustion area. According to the boiler and the method, coal is subjected to staged combustion in the boiler through the primary air inlet device and the secondary air inlet pipeline system, primary combustion is carried out under the low oxygen condition, secondary combustion is carried out under the low fuel condition, so that the generation of nitrogen oxides during two-time combustion is greatly inhibited, the principle is simple, and the practicability is high.