73 results about "Coal pipeline" patented technology

The invention relates to a system and a method for quickly adjusting the load of a coal-fired unit. The system for quickly adjusting the load of the coal-fired unit comprises a coal mill unit, a first-class coal mill and a second-class coal mill, the pulverized coal burner group comprises a first type of pulverized coal burners and a second type of pulverized coal burners, the first type of pulverized coal burners correspond to and are communicated with the first type of coal mills, the second type of pulverized coal burners correspond to and are communicated with the second type of coal mills, and a second type of pulverized coal pipeline is provided with an adjusting turn-off device; the position of the adjusting turn-off device on the second-class pulverized coal pipeline is adjustable; a powder-containing burner; and the pulverized coal classifier is connected to the second-class coal mill through a second-class pulverized coal pipeline so as to receive pulverized coal, and is connected to the pulverized coal-containing burner, the first-class pulverized coal burner and the second-class pulverized coal burner through the second-class pulverized coal pipeline so as to controllably convey the pulverized coal in a working state. In this way, the load of the coal-fired unit can be rapidly adjusted.

The utility model provides a primary air powder concentration measuring device and a heat supply system, and belongs to the technical field of concentration measurement, and the device comprises an electrostatic loading system which is used for carrying out charge loading treatment on electrostatic ions on the surfaces of all pulverized coal particles when a power plant is in a low load state, so that all the electrostatic ions reach a saturated state; each electric charge quantity measuring sensor is used for measuring the total electric charge quantity of the static ions reaching the saturation state; each signal detection sensor is used for detecting charges generated when the static ions reaching the saturation state flow through and generating electric signals; and the controller is used for calculating the pulverized coal mass flow according to the electric signal generated by the signal detection sensor, and calculating the primary pulverized coal concentration in the pulverized coal pipeline according to the total charge quantity of the electrostatic ions and the pulverized coal mass flow. According to the scheme, the primary air powder concentration can be accurately measured under the condition of low load of the power plant.

The invention discloses a coal-fired boiler ammonia-doped combustion system and method based on high-temperature strong reduction, and belongs to the technical field of boiler combustion. A main combustion area and an original over fire air area are sequentially arranged in the ammonia coal blending combustion boiler body from bottom to top; a primary air nozzle and a secondary air nozzle are mounted in the main combustion area; the primary air nozzle is respectively connected with a pulverized coal pipeline, an ammonia gas pipeline and a primary air pipeline through a four-way joint; the secondary air nozzle is respectively connected with a combustion-supporting oxygen pipeline and a secondary air pipeline through a three-way joint; an original over-fire air nozzle and a high over-fire air nozzle are mounted in the original over-fire air area; the original over-fire air nozzle and the high over-fire air nozzle are connected with an over-fire air pipeline; according to the ammonia-doped combustion system and method for the coal-fired boiler based on high-temperature strong reduction, oxygenation combustion and the deep air classification technology are coupled, and the internal contradiction problem that the theoretical combustion temperature of ammonia is low and the risk that NOx emission exceeds the standard is large is solved.

The present invention provides a method for leveling the air and pulverized coal in a tangentially fired boiler with four-corner tangential burners. The present invention includes a four-drive leveling valve device and, based on the on-line measurement data of air and pulverized coal, the central controller adjusts the opening combinations of the four-drive leveling valves to level the air and pulverized coal velocities and concentrations in each air and pulverized coal pipeline, so as to ensure the balanced output of each layer of burners during the operation of the tangentially fired boiler with four-corner tangential burners, which is of great significance to the safety and economy of the boiler.

The invention provides a pulverized coal concentration device based on a charge method and a control method of the pulverized coal concentration device, and belongs to the field of combustion of coal-fired boilers. The problems that a traditional inertia separation technology is low in separation efficiency and prone to abrasion in the low-load stable combustion process of the pulverized coal boiler are solved. Comprising a corona discharge device, a grounding device, a central discharge device, a concentrated pulverized coal pipeline and a light-phase pulverized coal pipeline, a guide plate is arranged at an inlet of the concentrated pulverized coal pipeline, one end of the light-phase pulverized coal pipeline is inserted into the concentrated pulverized coal pipeline, and the other end of the light-phase pulverized coal pipeline is located on the outer side of the concentrated pulverized coal pipeline; the corona discharge device is arranged on the outer side wall, corresponding to the insertion section of the light-phase pulverized coal pipeline, of the concentrated pulverized coal pipeline, the grounding device is of an annular structure and arranged on the outer side of the corona discharge device in a surrounding mode, and a wear-resistant lining is arranged on the inner wall of the concentrated pulverized coal pipeline. The device is mainly used for improving the pulverized coal concentration of the pulverized coal boiler during low-load operation.

The utility model provides a coal combustion system for a cement production line, which comprises at least two raw coal storage bins for storing raw coal with different qualities, a conveying device arranged below the raw coal storage bins, a coal grinding device arranged at one end of the conveying device far away from the raw coal storage bins and comprising a hot air inlet and a pulverized coal outlet, the pulverized coal outlet is communicated with a bag dust collector through a first pulverized coal pipeline, an air exhaust windmill is arranged on one side of the bag dust collector and used for exhausting air in the bag dust collector, pulverized coal storage bins corresponding to the raw coal storage bins are arranged at the bottom of the bag dust collector, and a second pulverized coal pipeline is correspondingly arranged at the bottom of each pulverized coal storage bin. According to the coal powder conveying device, through different conveying paths, raw coal of different qualities is ground and then conveyed into the corresponding combustors to be combusted, the efficiency is high, and the coal cost is saved.

The invention provides a tangential combustion boiler capable of eliminating residual rotation momentum at a hearth outlet, and relates to the technical field of coal-fired power plant boiler flow field optimization and smoke temperature deviation treatment. Comprising a hearth, a multi-layer corner-type arranged direct-flow burner, a wall-type arranged turbulent burner, a pulverized coal connecting pipe, a plurality of stop valves, a pulverized coal pipeline, a temperature measuring system and a flow velocity measuring system. The multi-layer angle-type arranged direct-flow combustors and the wall-type arranged rotational-flow combustors are arranged, and the two sets of devices are used in a matched mode. Therefore, the problems that in an existing corner tangential combustion boiler, due to smoke residual rotation, over-temperature and abrasion of a tube panel cause large interference on safe operation of the boiler, and local dust accumulation of a horizontal flue, a furnace arch, a tail vertical shaft and other parts can be caused by the difference of smoke flow velocity distribution are effectively solved; the normal operation of the denitration devices on the two sides is influenced.

A burner system suitable for deep peak shaving includes a dual-purpose burner for both coal combustion and burnout, located directly below and above a pulverized coal burner. The combustion system's air box includes a pulverized coal burner air box and a dual-purpose burner air box. The pulverized coal burner air box is connected to the pulverized coal burner, and the dual-purpose burner air box is connected to both the dual-purpose burner and the burnout air burner. The dual-purpose burner is arranged in the burnout air area of ​​the furnace. By opening or closing the pulverized coal pipeline of the dual-purpose burner, it can flexibly function as both a pulverized coal burner and a burnout air burner depending on the unit load, ensuring that the main reheat steam temperature under low load and the NOx generated by combustion under high load meet design requirements.

The present invention discloses a supercritical boiler flexible peak shaving system and method. The cold inlets of the steam boiler water heaters are respectively connected to the outlet of the main pipe of the economizer outlet and the lower header of the water wall. The steam pulverized coal heater is arranged on the primary air pulverized coal pipeline. The inlet and outlet of the hot steam extraction pipeline are respectively connected to the hot reheat steam header and the hot inlet of the steam boiler water heater. The hot outlet of the steam boiler water heater is connected to the hot inlet of the steam pulverized coal heater, and the hot outlet of the steam pulverized coal heater is connected with a waste steam pipeline. The present invention overcomes the problem of a relatively high wet state conversion load during the ultra-low load operation of a supercritical boiler. Under the condition that the unit is in ultra-low load operation and the boiler needs to be converted to wet state operation, the boiler water from the economizer outlet to the lower header of the water wall is heated, the ignition environment of pulverized coal is improved, and the conversion to wet state is postponed during the load reduction process; the primary air pulverized coal airflow is heated by steam, the temperature of the pulverized coal airflow is increased, the ignition heat of the pulverized coal is reduced, and the combustion stability is improved.

The application discloses a kind of coal powder pipeline blockage early warning method of thermal power plant, it is related to the field of electric power industry automation and condition monitoring technique, the present application automatically identifies the flow characteristic difference of different coal, and dynamically adjusts early warning threshold, avoid the false alarm caused by coal variety change;Adopt the way of generative adversarial network and computational fluid dynamics simulation combination, realize the virtual monitoring to key area such as elbow pipe, break through the limitation that only can rely on straight pipe section monitoring in the past;Through high-frequency sampling and cumulative sum algorithm, the transient abnormal capture ability is significantly improved, and the precursory characteristics of blockage can be found earlier;The linkage of hierarchical early warning mechanism and disposal suggestion makes the system not only can find problems, but also can provide targeted solution, greatly improves operation and maintenance efficiency, using software algorithm upgrade mainly, maximum utilization of existing hardware resources, reduces the transformation cost and implementation difficulty.

The application discloses a flow field uniform distribution device suitable for adjustable and retractable holes of a pulverized coal pipeline, which comprises a shell, a central blunt body arranged at the center of the shell, a first flow guide ring, a second flow guide ring and a third flow guide ring arranged between the shell and the central blunt body from outside to inside, and the first flow guide ring, the second flow guide ring and the third flow guide ring are connected together through support ribs and the shell; the central blunt body comprises a lip-shaped blunt body and annular blades arranged on the circumference of the lip-shaped blunt body, and the shell is provided with an air inlet and an air outlet along the axial direction. A plurality of annular airflow channels are formed between the first flow guide ring, the second flow guide ring, the third flow guide ring, the central blunt body and the shell. The application can improve the distribution characteristics of airflow after the adjustable and retractable holes of the primary air pipeline, improve the airflow distribution uniformity, meet the test requirements under the existing actual conditions, and thus improve the test precision and work efficiency.

The invention relates to the field of blast furnace ironmaking, and particularly discloses electromagnetic preheating equipment for a blast furnace pulverized coal pipeline, which comprises a preheating pipe connected between a mixer and a blast furnace, the preheating pipe is made of a metal material, a plurality of channels for pulverized coal to pass through are arranged in the preheating pipe, and an electromagnetic heating coil is sleeved outside the preheating pipe. After alternating current is introduced into the electromagnetic heating coil, an alternating magnetic field is generated, the preheating pipe generates eddy current and then emits heat, heat is transferred to pulverized coal and nitrogen flowing in the pipeline, the temperature of the pulverized coal rises, and the purpose of preheating the pulverized coal is achieved. The electromagnetic heating coil generates eddy current in the metal preheating pipe to generate heat, so that non-contact heating is realized, and heat radiation loss and open fire hidden dangers of traditional resistance heating are avoided; the alternating magnetic field directly acts on the preheating pipe, and the heat efficiency is obviously higher than that of an indirect heating mode; heat is uniformly conducted to pulverized coal and nitrogen in the channel through the pipe wall, and local overheating or heating dead angles are avoided.

The invention discloses a pipeline coal conveying pump station in-station allocation system which comprises a belt conveying unit, a raw coal surge bin is arranged at one end of the belt conveying unit, a constant feeder is connected to the output end of the raw coal surge bin, a rod mill is connected to the output section of the constant feeder, a water conveying pump is connected to a water inlet of the rod mill, and a water outlet of the water conveying pump is connected to a water outlet of the constant feeder. A discharge port of the rod mill is connected with a coal slurry buffer tank, the coal slurry buffer tank is sequentially connected with a coal slurry pump and a slurry storage tank group through pipelines, the slurry storage tank group is connected with a slurry feeding pump through a pipeline, and the slurry feeding pump is connected with a diaphragm pump through a pipeline. Meanwhile, the invention further discloses a coal slurry blending method, the liquid levels of the raw coal buffer bin, the coal slurry buffer tank and the slurry storage tank group are detected through the sensors, then all the systems are instructed to operate according to the calculated processing load, dynamic balance among all the systems is achieved, and the phenomena of violent fluctuation of system operation and even shutdown caused by insufficient supply are avoided.

The utility model relates to the technical field of pulverized coal pipeline monitoring, and discloses a coal mill pulverized coal pipeline monitoring device which comprises a sampling pipe, pulverized coal pipeline bodies are installed at the two ends of the sampling pipe, an auxiliary pipe is installed at the top of the sampling pipe, and a CO gas sensor is installed at the top of the auxiliary pipe. The clamping and stabilizing assembly comprises a plurality of mounting plates mounted on the outer wall of the auxiliary pipe and a connecting plate mounted at one end, opposite to the CO gas sensor, of each mounting plate, and a clamping plate is fixedly mounted at one end of each connecting plate. The stability and measurement precision of the sensor are ensured, it can be ensured that the sensor is not prone to displacement in the long-term use process, the original installation position of the sensor is kept, installation and disassembly of the sensor are facilitated, personnel can rapidly install and replace the sensor, the maintenance frequency is reduced, and therefore the accuracy of parameter measurement is improved.

The utility model relates to the technical field of lime shaft kilns, in particular to a double-hearth kiln fuel spray gun which comprises a gas pipeline, a pulverized coal pipeline, an inlet sleeve and an outlet sleeve. The coal gas pipeline and the pulverized coal pipeline are both in an L shape, the inlet end of the coal gas pipeline is fixed to the outer wall of the inlet sleeve and communicated with an inner cavity of the inlet sleeve, the inlet sleeve is arranged on the horizontal portion of the pulverized coal pipeline in a sleeved mode, and the two ends of the inlet sleeve are connected with the outer wall of the pulverized coal pipeline in a sealed mode. A coal gas inlet pipe is arranged on the inlet sleeve; the outlet end of the gas pipeline is fixed on the outer wall of the outlet sleeve and communicated with the outlet sleeve, the lower portion of the pulverized coal pipeline is arranged in the outlet sleeve in a penetrating mode in the axial direction of the outlet sleeve, and the top end of the outlet sleeve is connected with the outer wall of the pulverized coal pipeline in a sealed mode. The utility model provides the double-hearth kiln fuel spray gun which not only realizes the diversification of fuel, but also does not limit the use of single fuel.

The utility model discloses a system for replacing an oxygen pipeline of a gasification furnace by adopting medium-pressure superheated steam, which is characterized in that a pulverized coal pipeline and the oxygen pipeline are both connected to a gas inlet of a coal burner of the gasification furnace, a high-pressure nitrogen pipeline is connected to the oxygen pipeline, and the oxygen pipeline is connected to the coal burner of the gasification furnace through an oxygen-steam mixer; a first feeding port of the oxygen and steam mixer is connected with an oxygen pipeline and a high-pressure nitrogen pipeline, a second feeding port of the oxygen and steam mixer is connected with a medium-pressure superheated steam pipeline, and the medium-pressure superheated steam pipeline is sequentially provided with a hand valve, a steam filter, a second adjusting valve and a fifth switch valve in the material flowing direction. And a discharge hole of the oxygen-steam mixer is connected to a gas inlet of the coal burner through a replacement section oxygen pipeline. The medium-pressure superheated steam system is used for replacing a high-pressure nitrogen system to replace the oxygen pipeline of the gasification furnace, so that the fluctuation of nitrogen can be reduced, the safety of the replacement pipeline is ensured, and the content of nitrogen in crude synthesis gas can be obviously reduced.

This utility model discloses a sealing device for a circular backrest tube, including a backrest tube body and a pipeline ball valve sealed to the pressure measuring port of the pulverized coal flow pipeline. The sealing device includes a sealing component threaded to one end of the pipeline ball valve and a compression component. This utility model allows for manual opening of the pipeline ball valve, inserting the backrest tube body through the valve into the pulverized coal pipeline. Manual rotation of the tightening ring drives the compression stud to rotate within the placement groove. During rotation, the compression stud extends towards the sealing ring. Under the compression of the compression stud, the narrow opening in the center of the sealing ring undergoes a certain degree of contraction and deformation, thus tightly wrapping around the outer wall of the backrest tube body, achieving a complete seal between the backrest tube body and the pulverized coal pipeline. This prevents the leakage of primary air and the air-powder mixture, thereby making the wind speed measurement of the pulverized coal pipeline more accurate.

The invention belongs to the technical field of coal combustion equipment, and relates to a rotational flow combustion device and method for ammonia-doped coal combustion, and the rotational flow combustion device comprises a pre-combustion chamber, a combustion chamber, a pulverized coal pipeline, an ammonia pre-decomposition chamber, an ammonia preheating chamber and an ammonia gas supply assembly; and the conveying assembly is arranged on the recirculation flue gas pipe and used for conveying the high-temperature flue gas generated in the combustion chamber into the ammonia preheating chamber to heat the ammonia gas. High-temperature flue gas in the combustion chamber can be conveyed into the ammonia preheating chamber to heat ammonia gas, the heated ammonia gas enters the ammonia pre-decomposition chamber and is decomposed into hydrogen and nitrogen under the action of an ammonia decomposition catalyst, the ignition temperature of the ammonia gas is reduced, normal combustion of the ammonia gas is guaranteed, and meanwhile on the basis of the turbulent burner, the combustion efficiency is improved. Compared with the prior art, a tertiary air pipeline of an original turbulent burner is transformed into the ammonia gas pre-decomposition chamber, adding of combustion-supporting air is reduced, original airflow distribution is prevented from being disturbed, the combustion efficiency of pulverized coal is improved, the content of oxygen is reduced, and generation and emission of NOx are reduced.

The application discloses a kind of anti-clogging special mechanical transmission device of pulverized coal pipeline, it is related to pulverized coal pipeline technical field, including conveying pipe, the inside of conveying pipe is shaped with the first inner cavity for pulverized coal conveying, wind pipe, the inside of wind pipe is shaped with the second inner cavity for conveying wind force, the second inner cavity is fixed with fixed box inside by welding, stirring mechanism.The application is stirred by being provided with stirring mechanism, fan rotation drives rotating lever rotation, rotating lever rotation drives first bevel gear rotation, first bevel gear rotation drives second bevel gear rotation, second bevel gear rotation drives rotating column rotation, rotating column rotation drives stirring blade rotation, stirring blade rotation and the pulverized coal in the first inner cavity in conveying pipe inside are stirred, by this structure, it is favorable to the operation of pulverized coal conveying stirring and dispersing, avoid the situation that pulverized coal agglomerates appears in conveying pipe inside, to avoid the situation that pulverized coal blockage appears in conveying pipe inside.

The invention discloses a premixing gradually-shrinking side-blowing multi-pore-channel structure chaos stirring spray gun, and relates to the technical field of thermometallurgy, the premixing gradually-shrinking side-blowing multi-pore-channel structure chaos stirring spray gun comprises a gradually-shrinking type pulverized coal pipeline, a spraying nozzle and a spraying nozzle, the first spray gun outer pipe is arranged on the outer sides of the multiple flow guide ridges in a sleeving mode, every two adjacent flow guide ridges, the outer side face of the gradually-shrunk pulverized coal pipeline and the inner side face of the first spray gun outer pipe define a gradually-shrunk gas flow channel, and the sectional area of the gradually-shrunk gas flow channel is gradually reduced from the inlet end to the outlet end; the oxygen-enriched gas disperses airflow through a plurality of tapered gas flow channels to form fine and uniform bubble groups, and the flow speed is increased; the oxygen-enriched gas in the bubble state is beneficial to increasing the gas-liquid and gas-solid contact area in the molten pool and improving the mass transfer effect, the oxygen-enriched gas with the high flow rate can penetrate through a slag layer after being sprayed into the molten pool, fluid is guided to do chaotic motion in the molten pool, the gas-slag mixing uniformity is improved, and therefore the stirring effect and the reaction rate are improved.

The utility model discloses a combustion data sampling system for a variable coal type W flame boiler, which comprises a coal mill and a combustor, a pulverized coal pipeline is connected between the coal mill and the combustor, a sampling pipeline is mounted on the pulverized coal pipeline, the sampling pipeline is used for sampling pulverized coal to be combusted in the pulverized coal pipeline, and the sampling pipeline is used for sampling the pulverized coal to be combusted in the pulverized coal pipeline. The output end of the sampling pipeline is connected to the coal quality online detection device; a sound wave emission receiver is installed in a hearth of the combustor and connected with the industrial personal computer. According to the utility model, the pulverized coal sampling device before combustion and the acoustic wave temperature measuring device after combustion are additionally arranged in the boiler system, so that data support is provided for boiler flue gas composition and temperature detection.

The invention discloses a novel jet combustion device suitable for multi-coal blending combustion, belongs to the technical field of combustors, and solves the problem that an existing combustor cannot give consideration to combustion efficiency, stable combustion load and NOx emission due to changeable coal sources and large coal quality difference in a power plant. The burner body is provided with a central air duct, a primary air duct, an inner secondary air channel and an outer secondary air channel which are concentrically sleeved from inside to outside, and the central air duct, the primary air duct, the inner secondary air channel and the outer secondary air channel jointly form a main nozzle. The central air duct is provided with an independent inlet, and the inlet of the external secondary air channel is provided with a tangential air inlet air regulator structure; a pulverized coal concentration device is arranged at the upstream of primary air, an inlet of the pulverized coal concentration device is connected with a primary air pulverized coal pipeline, a first outlet is connected to a primary air cylinder through a concentrated-phase pulverized coal pipeline, and a second outlet is connected to an exhaust gas nozzle through an exhaust gas pipeline; and the exhaust gas nozzle and the main nozzle are in the same vertical plane and are positioned above the main nozzle. The device is mainly used for a power station boiler, and efficient stable combustion and low-nitrogen combustion of different coal types are achieved by conducting dense-thin separation and graded air distribution on air powder airflow.

The invention discloses a wear-resistant coal injection elbow, a coal injection elbow pipe and a disassembly and assembly method, and belongs to the technical field of pulverized coal pipelines. The wear-resisting coal injection elbow comprises a bent-pipe-shaped metal pipe body, an opening area is formed in the outer bent side of the metal pipe body, an arc-shaped ceramic sheath is buckled to the opening area, an outer cover is buckled to the outer side of the ceramic sheath, the outer cover is used for pressing and limiting the ceramic sheath, and the outer cover is fixedly arranged on the outer bent side of the metal pipe body; the ceramic sheath is independently arranged and buckled in the opening area of the metal pipe body instead of being pasted in the pipe as a lining, so that the limitation of the inner diameter of the elbow on the ceramic thickness is broken through, the thicker ceramic sheath can be selected according to the wear requirement, and the problems that the traditional lining ceramic is thinner in wall thickness and short in service time are solved; meanwhile, the pressing and limiting of the outer cover on the ceramic sheath replaces the pure pasting and fixing, the binding force of the ceramic and the metal pipe body is greatly improved, and the problem of wear resistance failure caused by the fact that the lining ceramic falls off due to washing is solved in cooperation with the limiting of the opening area.

The invention discloses a thermal power plant pulverized coal pipeline blockage early warning method, relates to the technical field of electric power industry automation and state monitoring, and aims to automatically identify flow characteristic differences of different coal types, dynamically adjust an early warning threshold value and avoid false alarms caused by coal type changes. By adopting a mode of combining a generative adversarial network and computational fluid dynamics simulation, virtual monitoring of key areas such as a bent pipe is realized, and the limitation that monitoring can only depend on a straight pipe section in the past is broken through; the transient abnormality capturing capability is remarkably improved through a high-frequency sampling and cumulative sum algorithm, and blockage precursor features can be found earlier; through linkage of a grading early warning mechanism and disposal suggestions, the system not only can discover problems, but also can provide targeted solutions, the operation and maintenance efficiency is greatly improved, a software algorithm upgrading-based mode is adopted, existing hardware resources are utilized to the maximum extent, and the modification cost and the implementation difficulty are reduced.

The invention provides a fan mill lignite boiler plasma ignition method, system and related device, the fan mill lignite boiler plasma ignition system comprises a plasma pulverized coal burner and a plasma generator, and the plasma generator is obliquely inserted and installed on the side face of a spray pipe of the plasma pulverized coal burner in the radial direction; the technical problem that the plasma generator cannot be axially installed due to the fact that the arrangement positions of the fan mill pulverized coal pipeline and the combustor are limited is effectively solved, and the plasma generator is particularly suitable for the special structure that the distance between a pulverized coal elbow and a combustor spray pipe is long and the height is inconsistent in a fan mill pulverizing system.

The utility model discloses a mixed coal blending combustion system for an ultra-supercritical coal-fired generator set, which comprises a raw coal bunker and a boiler, coal in the raw coal bunker is conveyed out by a coal feeder, the coal feeder conveys the coal to a coal grinding assembly, pulverized coal processed by the coal grinding assembly enters a pulverized coal bunker from a discharge port, the boiler is connected with a pulverized coal burner, a pulverized coal pipeline and an air bellow, and the air bellow is connected with the pulverized coal burner. The boiler is communicated with an electric dust remover through a pipeline, and the electric dust remover is communicated with follow-up equipment through a pipeline. Dynamic control over the air supply amount is achieved through the arranged air supply machine, the combustion rate of fuel is increased, and the better energy-saving effect is achieved; blended coal blending combustion is achieved through the coal feeder and the coal mill unit, meanwhile, the system is an ultra-supercritical coal-fired power generation unit, the utilization rate of fuel is increased, and energy saving of the system is achieved.

The utility model relates to a pulverized coal pipeline heating device for a pulverized coal boiler. The pulverized coal pipeline heating device comprises a pulverized coal pipeline, a heating assembly and a heat preservation device. The heating assembly is arranged on the outer side of the pulverized coal pipeline, a heat preservation device is arranged on the outer side of the pulverized coal pipeline and the heating assembly, and the heating assembly is an electric heating assembly or a steam heating assembly. In the design of a boiler, the temperature of pulverized coal airflow at an inlet of a pulverized coal pipeline can be controlled to be 120-130 DEG C; by means of the heating device, the temperature of pulverized coal airflow is further increased, and the temperature increasing amplitude ranges from 10 DEG C to 100 DEG C; according to the heating device, the temperature of pulverized coal airflow is increased, ignition heat of the pulverized coal airflow is reduced, the ignition condition of the pulverized coal airflow is improved, and therefore the ignition and stable combustion characteristics of the pulverized coal boiler are effectively improved.

The present invention discloses a method for reducing NO by reburning pulverized coal conditioned with active gas x The method includes the following steps: medium and high volatile coal fuel is carried by primary air and injected into the main burner on one side of the pulverized coal combustion chamber, and hot air enters the main combustion zone through the main burner in sequence; the medium and high volatile coal fuel is carried by recirculating flue gas and enters the reburner above the main burner through the reburn pulverized coal pipeline and the reburn pulverized coal nozzle, and the conditioning gas enters the reburner through the conditioning gas pipeline, the conditioning gas nozzle and the reburn pulverized coal nozzle in sequence. The medium and high volatile coal fuel and the conditioning gas are mixed in the reburner and then enter the reburn zone; hot air enters the burnout zone through the separated overfire air pipeline, the separated overfire air nozzle and the burnout burner above the reburner to burn out the combustion products. By adopting the above steps, the present invention uses the conditioning gas to condition the solid fuel, which not only ensures the effect of reducing NO x emissions, but also alleviates problems such as poor burnout caused by using a high proportion of reburn pulverized coal.

The invention provides an independent disconnecting link type primary air speed adjusting device which comprises a shell, a first connecting rod and a second connecting rod, the shell is provided with a containing cavity and a connecting end, and the connecting end is used for being connected with an opening of a pipeline; the throttling plate is arranged on the shell in the mode of being capable of rotating relative to the shell, the throttling plate has a first state and a second state, when the throttling plate is in the first state, the throttling plate is located in the containing cavity, and when the throttling plate is in the second state, at least part of the throttling plate penetrates through the connecting end from the containing cavity and stretches into the pipeline. Local throttling losses of the pipelines are changed through the throttling plates in a semi-intervention mode, and therefore the relative deviation of the air speed between the pulverized coal pipelines is adjusted. Compared with a traditional core plate type adjustable lock hole, the device has the advantages of being rapid in adjustment, simple in structure, not prone to blockage and rusting and convenient to disassemble. In the replacement process of the device, the pulverized coal pipeline or the coal mill does not need to be stopped, replacement can be completed only through temporary plugging, and therefore the stability of the combustion working condition is guaranteed to the maximum extent.

The utility model provides a non-coal pipeline one-way exhaust valve, and belongs to the technical field of exhaust valves. The non-coal pipeline one-way exhaust valve comprises a valve body and at least one annular waterproof pad. A connecting part and an annular mounting groove are formed at the two opposite ends of the valve body respectively, the connecting part is used for being connected with an exhaust component, and the valve body is provided with an exhaust hole communicating with the mounting groove and the exhaust component. The annular waterproof pad is fixed in the mounting groove and used for sealing the mounting groove, the waterproof pad is provided with a bent part close to the inner circumferential side, one side face of the bent part faces the exhaust hole, and the bent part is a flexible part and is bent in the air outlet direction of the exhaust part. According to the one-way exhaust valve, the exhaust component can be allowed to exhaust outwards, and meanwhile, external air, water and the like are prevented from entering the exhaust component to cause corrosion of the exhaust component or other adverse effects on the exhaust component.