CN102345863B - Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace - Google Patents
Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace Download PDFInfo
- Publication number
- CN102345863B CN102345863B CN 201110298069 CN201110298069A CN102345863B CN 102345863 B CN102345863 B CN 102345863B CN 201110298069 CN201110298069 CN 201110298069 CN 201110298069 A CN201110298069 A CN 201110298069A CN 102345863 B CN102345863 B CN 102345863B
- Authority
- CN
- China
- Prior art keywords
- anode
- negative electrode
- low
- chamber
- pulverized coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses a depth hierarchy low-NOx combustion system in a low-temperature plasma direct-current pulverized coal furnace. The system comprises a furnace and four low-temperature plasma direct-current pulverized coal ignition combustors which are configured in the main combustion region of a boiler hearth in a four-angle mode; a primary air nozzle of each low-temperature plasma direct-current pulverized coal ignition combustor is connected with the main combustion region of the hearth, and the main combustion region of the hearth is connected with a secondary air main pipeline nozzle; the hearth after-combustion region of the boiler is provided with a sectional air nozzle; a secondary air branch pipe is configured on the secondary air main pipeline; the sectional air nozzle is connected with the secondary air branch pipe, i.e., fuel materials are subjected to thermal cracking treatment before the combustion of the fuel materials, and the combustion effect is improved; and hierarchy air distribution is adopted for the combustion in a fuel furnace, thus the NOx generation is reduced. Therefore, according to the invention, the low-temperature plasma direct-current pulverized coal ignition combustors and the furnace hierarchy low-NOx combustion system are combined, the stable combustion of a combustion device under a low-load condition is ensured, simultaneously on the premises of not reducing the economic efficiency of the boiler, the emission of NOx is reduced.
Description
Technical field
The present invention relates to a kind of coal dust low NOx combustion system, especially a kind of with low-temperature plasma straight-through pulverized coal burner and stove internal classification air distribution technology in conjunction with the coal dust low NOx combustion system that is applied to boiler.Belong to the thermal power field of engineering technology, and environmental technology field.
Background technology
Nitrogen oxide is one of main atmosphere pollution, mainly comprises NO, NO
2, N
2O, N
2O
3, N
2O
5Deng, general designation NOx.Nitrogen oxide also can produce multiple secondary pollution except as primary pollution injury health.Nitrogen oxide is one of important as precursors thing that generates ozone, is also the major reason that forms regional fine particles pollution and gray haze, thereby the developed area atmospheric visibility such as China's Delta of the Pearl River is descended increasingly, and the gray haze number of days constantly increases.In recent years, China's total particulate discharge capacity is substantially controlled, and SO2 emissions descend to some extent, but nitrogen oxide emission rises rapidly along with the rapid growth of China's energy-consuming and vehicle guaranteeding organic quantity.Result of study also shows, the increase of nitrogen oxide emission make China's Acid Rain Pollution by sulfuric acid type to sulfuric acid and the compound transformation of nitric acid, nitrate ion in acid rain shared ratio from 1/10 of the eighties in last century progressively rise in recent years 1/3.The Eleventh Five-Year Plan period, the rapid growth of discharged nitrous oxides has aggravated the degradating trend of regional acid rain, partial offset China in the great efforts of paying aspect the sulfur dioxide reduction of discharging.The Thermal Power Generation Industry nitrogen oxide emission is huge, in the urgent need to controlling.Statistical analysis according to " the Emission Controlling Technology of Nitric Oxides project study report of Chinese thermal power plant " of China environmental protection industry association and organization, the nitrogen oxide total amount of power plant emission in 2007 has increased to 8,400,000 tons, increased closely 40.6% than 597.3 ten thousand tons in 2003, accounted for 35%～40% of national nitrogen oxide emission.The discharged nitrous oxides level of China unit's generated energy in 2007 is 3.1 grams/kilowatt hour, with world major industrial country relatively, and higher than developed country's unit generated energy emission levels of 1999 such as the U.S., Japan, Britain, Germany.According to scholarly forecast, along with the quickening of the national economic development, population growth and urbanization process, Chinese nitrogen oxide emission will continue to increase.National nitrogen oxide emission reached 2,000 ten thousand tons in 2008, became the first in the world discharged nitrous oxides state.If without control, nitrogen oxide emission will reach 3,000 ten thousand tons at the year two thousand twenty, bring huge threat for China's atmospheric environment.
Three kinds of mechanism that generate NOx in the Thermal Power Generation Industry process of coal combustion are: heating power type, prompt type and fuel type.Fuel type NOx accounts for 80% of NOx total release.Fuel type NOx generates owing to containing nitrogen (N) in fuel, and in process of coal combustion, fuel N overflows with fugitive constituent, and enters oxygen reaction generation NOx in the stove air; Anoxycausis in the coal dust primary zone, in the coal dust firing starting stage, fuel N overflows with fugitive constituent, generates NOx, and then in the situation that anoxic, NOx is reduced into again N2, in appropriate location, top, primary zone, sprays into after-flame wind at last, with coke after-flame in flying dust.At present the low N0x combustion technology that generally adopts of boiler factory mainly contains: Researched of Air Staging Combustion Burning Pulverized Coal technology, fuel-staged combustion technology, catch fire overheavy firing and combustion technology etc. more in advance.The application of these technology usually can produce the burning tissue in stove and change, thereby affects the efficiency of combustion of boiler.During the boiler actual motion, considering coal dust catching fire after spraying into burner hearth, the surely requirement of combustion and after-flame, and Boiler Economical Operation index, the degree of fuel staging and air classification is limited, and the effect that NOx reduces discharging can't reach expection.
Therefore, station boiler satisfies in the urgent need to a kind of high efficency low NOx combustion technology that steady combustion and efficiency of combustion are not exerted an influence the requirement that generating plant pulverized coal boiler NOx reduces discharging.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace is provided, it carries out thermal cracking to fuel before fuel combustion processes, and improves combustion efficiency; Adopt staged air distribution in the Fuel Furnace internal combustion, generate thereby reduce NOx.Therefore, technical purpose of the present invention is that the low-temperature plasma straight-through pulverized coal burner is combined with stove internal classification low NOx combustion system, thereby guarantee combustion apparatus energy smooth combustion under the underload situation, solve simultaneously under the prerequisite that does not reduce the boiler business efficiency, reduce the discharging of NOx.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace, comprise boiler and be four jiaos of four groups of low-temperature plasma pulverized coal direct-current ignition burners that are arranged in the boiler furnace primary zone, a wind snout of every group of low-temperature plasma pulverized coal direct-current ignition burner all is connected with the burner hearth primary zone, and the burner hearth primary zone is connected with Secondary Air trunk line spout, the burner hearth burning-out zone of described boiler is installed segmentation wind nozzle, described Secondary Air trunk line configuration Secondary Air arm, described segmentation wind nozzle is connected with the Secondary Air arm; Described low-temperature plasma pulverized coal direct-current ignition burner comprises coal burner, plasma generator and cooling chamber, and described plasma generator is arranged on plasma generator and installs in pipeline section, and the entrance of described coal burner is connected with the burner connecting cylinder; Described plasma generator is arranged on the cylindrical shell of burner connecting cylinder, and the axis angle α of the axis of plasma generator and coal burner is: 75 ° of ﹤ α≤90 °; Cooling chamber is installed in the inner flow passage entrance installation one-level thermal cracking chamber of coal burner in the burner connecting cylinder; The thermal source passage of the spout end of described plasma generator by cooling chamber is connected with one-level thermal cracking chamber, and the thermal source channel entrance end of cooling chamber with put windburn powder cylinder and be connected, the low-temperature receiver passage of cooling chamber is connected with the low-temperature receiver medium; The spout end of described plasma generator and the interior vertical pulverized coal concentrator that is split into two strands of wind powder streams of the igniting pulverized coal flow that impels inlet point windburn powder cylinder of installing of the cooling chamber thermal source pipeline between some windburn powder cylinder.
Described plasma generator comprises cathode assembly, anode assemblies and the anode and cathode connector that cathode assembly, anode assemblies are connected, wherein: described cathode assembly, comprise the open at both ends setting cathode shell, in establish negative electrode and the negative electrode conducting rod of cavity; The upper end of cathode shell and the sealing-in of negative electrode top cover, and the internal face of cathode shell is processed with negative electrode water-cooled cannelure; The two ends of negative electrode outer wall respectively with the flange of both sides, negative electrode water-cooled cannelure up and down accordingly liquid sealing be connected; One end of negative electrode conducting rod tightens up with the cathode connection plate after stretching out the negative electrode top cover, the other end is placed in the inner chamber of negative electrode, and formation cathode inlet chamber after negative electrode conducting rod, negative electrode, cathode shell and the assembling of negative electrode top cover, offer accordingly simultaneously the cathode inlet mouth and the negative electrode water inlet that is communicated with the water-cooled cannelure respectively and the negative electrode delivery port that connect with the cathode inlet chamber on cathode shell, described negative electrode conducting rod is connected with the thread in inner cavity of negative electrode afterwards and negative pole electric arc controller is fixed; Described negative pole electric arc controller comprises eddy flow spare body, and this eddy flow spare body offers core jet pipe along axis; Described eddy flow spare body comprises the eddy flow cylindrical section and shrink to extend along an end of cylindrical section the eddy flow conical section that forms, and simultaneously, the outer surface of described eddy flow cylindrical section is offered helicla flute; Described core jet pipe, helicla flute all are communicated with the cathode inlet chamber by the water conservancy diversion through hole offered on the negative electrode conducting rod, and core jet pipe extends by cone section jet pipe and an edge cone section jet pipe taper end shell of column jet pipe that forms and forms, described shell of column jet pipe is opened in the eddy flow conical section, cone section jet pipe is opened in the eddy flow cylindrical section, and the large end of core jet pipe is adjacent with the negative electrode conducting rod; Described anode assemblies comprises anode, anode water jacket, anode casing and anode cyclone ring; The inwall that anode casing nestles up the upper end arranges groove, the uncovered end that the periphery of anode cyclone ring and groove bottom land the are oppositely arranged sealing-in that closely cooperates, and the space between this anode cyclone ring and groove bottom land forms the anode inlet plenum; The uniform tangential discharge orifice more than 2 of the circumferencial direction of anode cyclone ring; Anode is offered the jet pipe for plasma jet vertically, and anode is placed in the below of anode cyclone ring, and the outer surface of anode is connected with the anode casing liquid sealing simultaneously; Anode water is placed between anode and anode casing, and this anode water jacket is divided into space between anode casing anode cooling water water-supplying chamber and the anode cooling water intake chamber that is communicated with anode; Offer respectively on anode casing with anode cooling water intake chamber and connect the anode cooling water inlet is connected, the anode coolant outlet that connects with anode cooling water water-supplying chamber, the anode inlet that is connected with the perforation of anode inlet plenum and for the placing chamber of installation striking device; Described anode and cathode connector comprises insulating sleeve, and an end of this insulating sleeve is threaded with negative electrode, and the other end is by supported flange and and anodic bonding.
Space between described negative electrode outer wall and water-cooled cannelure is separated into the negative electrode cooling water intake chamber that is communicated with and negative electrode cooling water water-supplying chamber by the negative electrode water jacket is set; And an end of negative electrode water jacket is threaded with negative electrode water-cooled cannelure, and the negative electrode water inlet is communicated with negative electrode cooling water intake chamber, and the negative electrode delivery port is communicated with negative electrode cooling water water-supplying chamber.
Described cathode inlet mouth tangentially is connected with the inwall of cathode inlet chamber; The negative electrode water inlet is connected with the negative electrode delivery port with negative electrode cooling water intake chamber inwall, negative electrode cooling water water-supplying chamber inwall and tangentially is connected accordingly; Anode inlet tangentially is connected with anode inlet plenum inwall; Anode cooling water inlet, anode coolant outlet tangentially are connected accordingly with anode cooling water intake chamber inwall, anode cooling water water-supplying chamber inwall respectively.
Described striking device is hf arc starter, comprises armature, coil, insulating support and tungsten pin; Coil is connected with high-frequency exiting power; One end and the insulating support of armature are hinged, and the other end is adjacent with coil; Tungsten pin one end is fixedly connected with armature, and the other end passes insulating support and suspends.
On described Secondary Air arm, flow measurement device is installed.
According to above technical scheme, can realize following beneficial effect:
1, the present invention adopts the low-temperature plasma pulverized coal direct-current ignition burner as the igniter of fdc heater, keep duty at plasma generator, make the fuel generation heat cracking reaction that enters burner hearth, and can by changing the power output of plasma generator, adjust the thermal cracking degree of coal dust in burner.The oxygen amount that provides of wind air once only in burner, excess air coefficient is very low, and the strong reducing property burning situation of formation can reduce the generation of NOx effectively.After fuel sprays into burner hearth, because ignition issues solves, only need guarantee that certain air capacity guarantees steady combustion, so in stove, whole air distribution can be regulated in a wider context, the excess air coefficient in primary zone also can be controlled at very low level.Like this, all form extremely strong reducing atmosphere in burner inside and main combustion zone, be conducive to suppress the generation of NOx in process of coal combustion.For guaranteeing the final burn-off rate of coal dust, surplus air is fed with after-flame wind form from upper furnace, form the zone of a strong oxidizing property atmosphere, make coal dust imperfect combustion in the boiler main combustion zone strongly mix with air in this zone, fully reaction, thus guarantee that boiler combustion efficiency does not reduce.
2, the low-temperature plasma burner can make coal dust that thermal cracking occurs before entering burner hearth, C element in fuel can't be mixed with enough air under the condition of high-temperature low-oxygen just begin large quantitative response, and product is take CO as main.In this atmosphere, after pulverized coal preheating in fuel nitrogen component break, generate simultaneously amino or cyanogen class nitrogen atom group (NH3, CN, HCN).If this course of reaction is to carry out (residual air parameter DB＜0.4) in reducing medium, the unstable atom of the above-mentioned type is rolled into a ball majority and is changed into dinitrogen (N2), and does not change into nitrogen oxide, has finally reduced the generation of fuel type Nox.
3, simultaneously, because excess air coefficient in the primary zone is very low, coal dust firing is incomplete, and temperature is limited, has controlled the generation of thermal NO x.At burning-out zone, although obtaining sufficient amount of oxygen, uncombusted fuel fully reacts, because the entrained air temperature is lower, the NOx growing amount is little, makes the overall growing amount of NOx be effectively controlled.
In sum, the present invention can guarantee effectively to suppress the growing amount of NOx in process of coal combustion under the prerequisite that boiler combustion efficiency does not reduce, and realizes that NOx reduces discharging.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the top view of Fig. 1;
Fig. 3 is the structural representation of low-temperature plasma pulverized coal direct-current ignition burner in Fig. 1;
Fig. 4 is the structural representation of Fig. 3 ionic medium generator;
Fig. 5 is the A-A cutaway view of Fig. 4;
Fig. 6 is plasma hf arc starter schematic diagram;
Wherein: anode 1; Anode O RunddichtringO 2; Anode water jacket 3; Anode casing 4; Anode seal 5; Plasma hf arc starter 6; Anode cyclone ring 7; Insulation gland flange 8; Insulated connectors 9; Locking nut 10; Negative electrode 11; Negative electrode water jacket 12; Negative electrode lower house 13; Negative electrode upper shell 14; Burner connecting cylinder 15; One-level thermal cracking chamber 16; Plasma generator 17; Plasma generator pipe laying 18; Cooling chamber 19; Wind powder connecting cylinder 20; Point windburn powder cylinder 21; Vertical strong/weak concentrated block 22; Burner hearth primary zone 23; Low-temperature plasma pulverized coal direct-current ignition burner 24; Segmentation wind nozzle 25; Burner hearth burning-out zone 26; Negative electrode top cover 27; Nut 28; Negative electrode take-up device 29; Cathode connection plate 30; Negative electrode sealing gasket 31; Negative electrode pad 32; Negative electrode top O RunddichtringO 33; Negative electrode cyclone 34; Negative electrode bottom O RunddichtringO 35; Cathode terminal 36; Mounting flange 37; Cathode inlet chamber 38; The cooling intake chamber 39 of negative electrode; Negative electrode cooling water outlet chamber 40; Anode inlet plenum 41; The cooling intake chamber 42 of anode; Anode cooling water outlet chamber 43; Armature 61; Coil 62; Insulating support 63; Tungsten pin 64.
The specific embodiment
Accompanying drawing discloses the structural representation of preferred embodiment involved in the present invention without limitation; Explain technical scheme of the present invention below with reference to accompanying drawing.
As depicted in figs. 1 and 2, deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace of the present invention, comprise boiler and be four jiaos of four groups of low-temperature plasma pulverized coal direct-current ignition burners that are arranged in the boiler furnace primary zone, a wind snout of every group of low-temperature plasma pulverized coal direct-current ignition burner all is connected with the burner hearth primary zone, and the burner hearth primary zone is connected with Secondary Air trunk line spout, the burner hearth burning-out zone of described boiler is installed segmentation wind nozzle, described Secondary Air trunk line configuration Secondary Air arm, described segmentation wind nozzle is connected with the Secondary Air arm.
During boiler operatiopn, plasma generator 17 remains duty, and plasma and heat cracking reaction chamber are heated to 800～1100 ℃ to coal dust, make it to reach the temperature of isolating the solid phase fugitive constituent before burner arrives at burner hearth; Wind snout of burner is connected with burner hearth master combustion zone 23, when Pulverized Coal sprays from burner, formation temperature reaches the mixture (fuel gas greater than 30%+residue charcoal core) more than 1200K, self ignition and smooth combustion after mixing with Secondary Air, the heat that burning discharges removes to light remaining Pulverized Coal.By will respectively extracting a transportation work style on two side secondary air house stewards, cause 23 tops, burner hearth master combustion zone through airduct, enter respectively the segmentation wind nozzle 25 of both sides, in the primary zone, oxygen concentration reduces thereby make, and is formed with to be beneficial to suppress the strong reducing property atmosphere that N0x generates.Heat cracking reaction occurs in coal dust under action of plasma before entering burner hearth, the C element in fuel is at high temperature and strictly control large quantitative response under the condition of oxygen making amount, and product is take CO as main.In this atmosphere, after pulverized coal preheating in fuel nitrogen component break, generate simultaneously amino or cyanogen class nitrogen atom group (NH3, CN, HCN).If this course of reaction is to carry out (residual air parameter DB＜0.4) in reducing medium, the unstable atom of the above-mentioned type is rolled into a ball majority and is changed into dinitrogen (N2), and does not change into nitrogen oxide, has finally reduced the generation of fuel type NOx.Because the interior excess air coefficient in primary zone 23 is very low, coal dust firing is incomplete, and temperature is limited, has controlled the generation of thermal NO x.
Extract a transportation work style before, inject burner hearth burning-out zone 26 from the after-flame wind snout 25 of upper furnace, strongly mix with the unburnt flue gas of coming from main combustion zone 23, form very strong oxidizing atmosphere, the pulverized coal particle in flue gas is burnt at this.At burning-out zone 26, owing to having injected a large amount of Cryogenic air from after-flame wind snout 25, make the temperature levels in the burner hearth burning-out zone can be too not high, so fully the burn NOx amount that generates of coal dust be limited.Like this, just under the prerequisite that has guaranteed boiler combustion efficiency and business efficiency, reduced the generation of N0x.
As shown in Figure 3, low-temperature plasma pulverized coal direct-current ignition burner of the present invention comprises coal burner, plasma generator and cooling chamber, described plasma generator is arranged on plasma generator and installs in pipeline section, and the entrance of described coal burner is connected with the burner connecting cylinder; Described plasma generator is arranged on the cylindrical shell of burner connecting cylinder, and the axis angle α of the axis of plasma generator and coal burner is: 75 ° of ﹤ α≤90 °; Cooling chamber is installed in the inner flow passage entrance installation one-level thermal cracking chamber of coal burner in the burner connecting cylinder; The thermal source passage of the spout end of described plasma generator by cooling chamber is connected with one-level thermal cracking chamber, and the thermal source channel entrance end of cooling chamber with put windburn powder cylinder and be connected, the low-temperature receiver passage of cooling chamber is connected with the low-temperature receiver medium; The spout end of described plasma generator and the interior vertical pulverized coal concentrator that is split into two strands of wind powder streams of the igniting pulverized coal flow that impels inlet point windburn powder cylinder of installing of the cooling chamber thermal source pipeline between some windburn powder cylinder.
As shown in Figure 4 and Figure 5, each member function of plasma generator of the present invention is as follows:
Anode 1: be assembled together with anode O RunddichtringO 2, anode water jacket 3, anode casing body 4, anode seal 5, anode cyclone ring 7, form anode assemblies; Be designed to the conical horn mouth-shaped, the compressed air of the rotation that produces by anode cyclone ring 7 makes its surperficial Arc point produce rotation, reduces surface abrasion, raising service life; Due to its special structure, and generate low temperature plasma under the acting in conjunction of negative electrode 11, penetrate the low temperature plasma torch of rotation;
Anode O RunddichtringO 2: the sealing of anode 1 bottom and anode casing body 4 junctions, bottom prevents that cooling water from leaking outside;
Anode water jacket 3: the space between anode 1 outer surface and anode casing body 4 inner surfaces is separated in two, forms the cooling intake chamber 30 of anode and anode cooling water outlet chamber 31, and make cooling water produce rotation, fully antianode 1 carries out coolingly, improves cooling effect;
Anode casing body 4: be threaded connection with anode 1, plasma hf arc starter 6 is fixed by screws in its side; Be provided with anode inlet d, anode water inlet e, anode delivery port f;
Anode seal 5: the sealing of anode 1 top and anode casing body 4 threaded connection places, top prevents that cooling water from leaking outside;
Plasma hf arc starter 6: list separately, its structural representation as shown in Figure 6: comprise armature, coil, insulating support and tungsten pin; Coil is connected with high-frequency exiting power; One end and the insulating support of armature are hinged, and the other end is adjacent with coil; Tungsten pin one end is fixedly connected with armature, and the other end passes insulating support and suspends.
Anode cyclone ring 7: after 4 assemblings of anode casing body, form anode inlet plenum 29, will rotate by along the circumferential direction uniform distribution of compressed air and generation that anode inlet d enters;
Insulation gland flange 8: insulated connectors 9 is bolted is fixed on anode casing body 4;
Insulated connectors 9: anode assemblies and cathode assembly are linked together, and insulation effect is played in two-part connection; Antianode ring 7 plays fixation simultaneously; Be threaded connection with negative electrode lower house 13, the location is accurately regulated in the gap of being convenient between negative electrode 11 and anode 1;
Locking nut 10: after adjust in the gap between negative electrode 11 and anode 1, cathode assembly and insulated connectors 9 are locked;
Negative electrode 11: fit together the formation cathode assembly with negative electrode water jacket 12, negative electrode lower house 13, negative electrode upper shell 14, negative electrode top cover 15, nut 16, negative electrode take-up device 17, cathode connection plate 18, negative electrode sealing gasket 19, negative electrode pad 20, negative electrode top O RunddichtringO 21, negative electrode cyclone 22, negative electrode bottom O RunddichtringO 23; Be designed to cylindrical tube shape, negative electrode cyclone 22 belows are arc chamber, produce the high-temperature electric arc of rotation, and negative electrode compressed air is become plasma; Its characteristics are that machining area is large, and Arc point effectively improves the life-span of negative electrode because turning effort ceaselessly changes; Due to its special structure, under the acting in conjunction of anode 1, the plasma that produces is low temperature plasma;
Negative electrode water jacket 12: be threaded connection with negative electrode upper shell 14, space between negative electrode 11 outer surfaces and negative electrode lower house 13 inner surfaces is separated in two, form the cooling intake chamber 39 of negative electrode and negative electrode cooling water outlet chamber 40, fully target 11 carries out coolingly, improves cooling effect;
Negative electrode lower house 13: be provided with negative electrode delivery port b; Be threaded connection with insulated connectors 9, the location is accurately regulated in the gap of being convenient between negative electrode 11 and anode 1; Be connected by argon arc welding with negative electrode upper shell 14;
Negative electrode upper shell 14: be provided with negative electrode water inlet a, cathode inlet mouth c; Be connected by argon arc welding with negative electrode lower house 13;
Negative electrode top cover 27: be connected and fixed by nut with negative electrode upper shell 14, and form cathode inlet chamber 38;
Nut 28: coordinate fixed negative pole 11 and cathode connection plate 30 with take-up device 29;
Negative electrode take-up device 29: be threaded connection with negative electrode 11, fixed negative pole cyclone 22 is provided with passage and guiding gutter, the compressed air in cathode inlet chamber 38 is dispensed to uniformly the air inlet of negative electrode cyclone 34; Be connected with cathode connection plate 30, power cathode is communicated to negative electrode 11, also can be used as the dismounting orientation tool that negative electrode 11 is connected with cathode shell;
Cathode connection plate 30: power cathode is connected with the transition of negative electrode;
Negative electrode sealing gasket 31: the target inlet plenum, 38 seal;
Negative electrode pad 32: the location when being used for the demolition, installation negative electrode;
Negative electrode top O RunddichtringO 33: the sealing between the cooling intake chamber 39 of cathode inlet chamber 38 and negative electrode;
Negative electrode cyclone 34: characteristics are that circumferencial direction adopts multi-thread helicla flute, make the carrier compressed air that produces plasma produce rotation, change arcing point, improve the life-span of negative electrode 11;
Negative electrode bottom O RunddichtringO 35: the sealing of negative electrode 11 bottoms and negative electrode lower house 13 junctions, bottom prevents that cooling water from leaking outside;
Anode terminal 36: be welded on anode casing body 4, positive source is connected with transition between anode 1;
Mounting flange 37: be used for plasma generator and be connected with installation between burner;
Cathode inlet chamber 38: make the compressed air uniform distribution that enters negative electrode;
The cooling intake chamber 39 of negative electrode: make the cooling water uniform distribution that enters negative electrode;
Negative electrode cooling water outlet chamber 40: evenly discharge after negative electrode cooling water hot water and cold water are separated;
Anode inlet plenum 41: make the compressed air uniform distribution that enters the anode utmost point;
The cooling intake chamber 42 of anode: make the cooling water uniform distribution that enters anode;
Anode cooling water outlet chamber 43: evenly discharge after anode cooling water hot water and cold water are separated;
A, negative electrode water inlet: type of attachment is divided into quick connector type and the type of being threaded;
B, negative electrode delivery port: type of attachment is divided into quick connector type and the type of being threaded;
C, cathode inlet mouth: type of attachment is divided into quick connector type and the type of being threaded;
D, anode inlet: type of attachment is divided into quick connector type and the type of being threaded;
E, anode water inlet: type of attachment is divided into quick connector type and the type of being threaded;
F, anode delivery port: type of attachment is divided into quick connector type and the type of being threaded.
The present invention is in whole boiler running process, and the plasma generator on burner keeps duty; When Pulverized Coal sprays from burner, formation temperature reaches the mixture (fuel gas greater than 30%+residue charcoal core) more than 1200K, self ignition and smooth combustion after mixing with Secondary Air, and the heat that burning discharges removes to light remaining Pulverized Coal.Reduce simultaneously the secondary air flow that the primary zone feeds, form a kind of strong reducing property atmosphere in the primary zone, Pulverized Coal is burnt under the state of high temperature anoxic; Surplus air feeds in burner hearth with after-flame wind form in upper furnace, form the zone of a strong oxidizing property atmosphere, make coal dust imperfect combustion in the boiler main combustion zone strongly mix with air, fully react, to satisfy the needs of coal dust after-flame in this zone.Its plasma generator generates low temperature plasma by arcing, and plasma contains a large amount of chemically active particles, as atom (C, H, O), atomic group (OH, H
2, O
2), ion (O
2 -, H
2 -, OH
-, O
-, H
+) and electronics etc., can accelerate the heat chemistry conversion, promote the green powder combustion decomposition.Plasma generator of the present invention has all adopted the thermal cracking gasification technology.It is that plasma and heat cracking reaction chamber can be heated to 800～1100 ℃ to coal dust, makes it to reach the temperature of isolating the solid phase fugitive constituent before burner arrives at burner hearth, can reach the combustion-supporting condition of black furnace non-oil ignition and underload; Plasma generator generates low temperature plasma by arcing, the wind powder is heated, and at the indoor heat cracking reaction that carries out of thermal cracking, the solid coal pruinescence is ionized into gaseous state, isolate fugitive constituent, make the coal dust partial combustion, reduce the oxygen content in primary wind and powder, make one-level thermal cracking chamber outlet fuel temperature higher than the burning of coal temperature, less than the coal dust melting temperature, the oxygen amount levels off to 0 simultaneously, is strict controlled in anaerobic state, and exit, thermal cracking chamber fuel is directly sent into boiler furnace; The core concept of coal burner makes pulverized coal particle farthest be gasified for to add physical reactions before combustion process, generates through the fuel combination combustible gas component several times after plasma gasification, realizes the low-temperature burning after coal gas.Reduce the secondary air flow that the primary zone feeds, respectively to extract a transportation work style from the Secondary Air house steward of burner hearth left and right sides porch, cause top, burner hearth primary zone by airduct, enter respectively four of the front and back segmentation wind nozzle of both sides, spray into burner hearth as after-flame wind, thereby form oxygen debt district in the primary zone, on top, primary zone, the after-flame wind action makes some combustible after-flames that do not fire; Enter on the pipeline of each after-flame wind combustor, flow measurement device is set, control after-flame wind throttle opening and air quantity variation in direct ratio.
Claims (6)
1. deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace, comprise boiler and be four jiaos of four groups of low-temperature plasma pulverized coal direct-current ignition burners that are arranged in the boiler furnace primary zone, a wind snout of every group of low-temperature plasma pulverized coal direct-current ignition burner all is connected with the burner hearth primary zone, and the burner hearth primary zone is connected with Secondary Air trunk line spout, it is characterized in that: the burner hearth burning-out zone of described boiler is installed segmentation wind nozzle, described Secondary Air trunk line configuration Secondary Air arm, described segmentation wind nozzle is connected with the Secondary Air arm; Described low-temperature plasma pulverized coal direct-current ignition burner comprises coal burner, plasma generator and cooling chamber, and described plasma generator is arranged on plasma generator and installs in pipeline section, and the entrance of described coal burner is connected with the burner connecting cylinder; Described plasma generator is arranged on the cylindrical shell of burner connecting cylinder, and the axis angle α of the axis of plasma generator and coal burner is: 75 ° of ﹤ α≤90 °; Cooling chamber is installed in the inner flow passage entrance installation one-level thermal cracking chamber of coal burner in the burner connecting cylinder; The thermal source passage of the spout end of described plasma generator by cooling chamber is connected with one-level thermal cracking chamber, and the thermal source channel entrance end of cooling chamber with put windburn powder cylinder and be connected, the low-temperature receiver passage of cooling chamber is connected with the low-temperature receiver medium; The spout end of described plasma generator and the interior vertical pulverized coal concentrator that is split into two strands of wind powder streams of the igniting pulverized coal flow that impels inlet point windburn powder cylinder of installing of the cooling chamber thermal source pipeline between some windburn powder cylinder.
2. deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace according to claim 1, it is characterized in that: described plasma generator comprises cathode assembly, anode assemblies and the anode and cathode connector that cathode assembly, anode assemblies are connected, wherein:
Described cathode assembly, comprise the open at both ends setting cathode shell, in establish negative electrode and the negative electrode conducting rod of cavity; The upper end of cathode shell and the sealing-in of negative electrode top cover, and the internal face of cathode shell is processed with negative electrode water-cooled cannelure; The two ends of negative electrode outer wall respectively with the flange of both sides, negative electrode water-cooled cannelure up and down accordingly liquid sealing be connected; One end of negative electrode conducting rod tightens up with the cathode connection plate after stretching out the negative electrode top cover, the other end is placed in the inner chamber of negative electrode, and formation cathode inlet chamber after negative electrode conducting rod, negative electrode, cathode shell and the assembling of negative electrode top cover, offer accordingly simultaneously the cathode inlet mouth and the negative electrode water inlet that is communicated with the water-cooled cannelure respectively and the negative electrode delivery port that connect with the cathode inlet chamber on cathode shell, described negative electrode conducting rod is connected with the thread in inner cavity of negative electrode afterwards and negative pole electric arc controller is fixed; Described negative pole electric arc controller comprises eddy flow spare body, and this eddy flow spare body offers core jet pipe along axis; Described eddy flow spare body comprises the eddy flow cylindrical section and shrink to extend along an end of cylindrical section the eddy flow conical section that forms, and simultaneously, the outer surface of described eddy flow cylindrical section is offered helicla flute; Described core jet pipe, helicla flute all are communicated with the cathode inlet chamber by the water conservancy diversion through hole offered on the negative electrode conducting rod, and core jet pipe extends by cone section jet pipe and an edge cone section jet pipe taper end shell of column jet pipe that forms and forms, described shell of column jet pipe is opened in the eddy flow conical section, cone section jet pipe is opened in the eddy flow cylindrical section, and the large end of core jet pipe is adjacent with the negative electrode conducting rod;
Described anode assemblies comprises anode, anode water jacket, anode casing and anode cyclone ring; The inwall that anode casing nestles up the upper end arranges groove, the uncovered end that the periphery of anode cyclone ring and groove bottom land the are oppositely arranged sealing-in that closely cooperates, and the space between this anode cyclone ring and groove bottom land forms the anode inlet plenum; The uniform tangential discharge orifice more than 2 of the circumferencial direction of anode cyclone ring; Anode is offered the jet pipe for plasma jet vertically, and anode is placed in the below of anode cyclone ring, and the outer surface of anode is connected with the anode casing liquid sealing simultaneously; Anode water is placed between anode and anode casing, and this anode water jacket is divided into space between anode casing anode cooling water water-supplying chamber and the anode cooling water intake chamber that is communicated with anode; Offer respectively on anode casing with anode cooling water intake chamber and connect the anode cooling water inlet is connected, the anode coolant outlet that connects with anode cooling water water-supplying chamber, the anode inlet that is connected with the perforation of anode inlet plenum and for the placing chamber of installation striking device;
Described anode and cathode connector comprises insulating sleeve, and an end of this insulating sleeve is threaded with negative electrode, and the other end is by supported flange and and anodic bonding.
3. deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace according to claim 2 is characterized in that: the space between described negative electrode outer wall and water-cooled cannelure is separated into the negative electrode cooling water intake chamber that is communicated with and negative electrode cooling water water-supplying chamber by the negative electrode water jacket is set; And an end of negative electrode water jacket is threaded with negative electrode water-cooled cannelure, and the negative electrode water inlet is communicated with negative electrode cooling water intake chamber, and the negative electrode delivery port is communicated with negative electrode cooling water water-supplying chamber.
4. deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace according to claim 3, it is characterized in that: described cathode inlet mouth tangentially is connected with the inwall of cathode inlet chamber; The negative electrode water inlet is connected with the negative electrode delivery port with negative electrode cooling water intake chamber inwall, negative electrode cooling water water-supplying chamber inwall and tangentially is connected accordingly; Anode inlet tangentially is connected with anode inlet plenum inwall; Anode cooling water inlet, anode coolant outlet tangentially are connected accordingly with anode cooling water intake chamber inwall, anode cooling water water-supplying chamber inwall respectively.
5. deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace according to claim 2, it is characterized in that: described striking device is hf arc starter, comprises armature, coil, insulating support and tungsten pin; Coil is connected with high-frequency exiting power; One end and the insulating support of armature are hinged, and the other end is adjacent with coil; Tungsten pin one end is fixedly connected with armature, and the other end passes insulating support and suspends.
6. deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace according to claim 1, is characterized in that: on described Secondary Air arm, flow measurement device is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110298069 CN102345863B (en) | 2011-09-28 | 2011-09-28 | Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110298069 CN102345863B (en) | 2011-09-28 | 2011-09-28 | Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102345863A CN102345863A (en) | 2012-02-08 |
| CN102345863B true CN102345863B (en) | 2013-06-12 |
Family
ID=45544787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110298069 Expired - Fee Related CN102345863B (en) | 2011-09-28 | 2011-09-28 | Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102345863B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079329B (en) * | 2012-12-26 | 2016-08-10 | 中国航天空气动力技术研究院 | A kind of high-pressure plasma ignition device |
| CN105838453B (en) * | 2016-05-31 | 2018-06-22 | 中国科学院广州能源研究所 | A kind of method for removing nitrogen-containing pollutant in biomass rough gas in biomass gasifying furnace in situ |
| CN106196165A (en) * | 2016-08-25 | 2016-12-07 | 江苏大唐国际吕四港发电有限责任公司 | Plasma ignition system and control method and applicable ultra-supercritical boiler |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2487965Y (en) * | 2001-01-15 | 2002-04-24 | 烟台开发区龙源电力燃烧控制工程有限公司 | Multifunctional pulverized coal burner using multi-stage axial feeding powder and gas film cooling technique |
| CN101900330B (en) * | 2010-07-23 | 2012-03-28 | 西安交通大学 | Plasma ignition burner for anthracite |
| CN201844394U (en) * | 2010-07-28 | 2011-05-25 | 南京创能电力科技开发有限公司 | Low-temperature plasma swirling pulverized coal ignition burner |
| CN202281219U (en) * | 2011-09-28 | 2012-06-20 | 南京创能电力科技开发有限公司 | Deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace |
-
2011
- 2011-09-28 CN CN 201110298069 patent/CN102345863B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102345863A (en) | 2012-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103104914B (en) | Biogas burner | |
| CN201706483U (en) | Biomass semi-gasification automatic control combustion engine | |
| CN202350009U (en) | Depth grading low-NOx combustion system in low-temperature plasma rotational flow pulverized coal boiler | |
| CN102345863B (en) | Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace | |
| CN110410787B (en) | Hydrogen and steam oxygen-enriched flameless combustor | |
| CN102338374B (en) | In-furnace grading low-NOx combustion system of low-temperature plasma rotational flow coal powder furnace | |
| CN103615718B (en) | A kind of two-period form coal dust combustion method | |
| CN102424910B (en) | Combustion nozzle for whole hydrogen bell-type annealing furnace, and waste hydrogen introduction and combustion method adopting the same | |
| CN207498325U (en) | For the plasma nozzle and gasification furnace of coal water slurry gasification | |
| CN113983495A (en) | Rotary detonation combustion chamber suitable for natural gas hydrogen-doped combustion | |
| CN202281219U (en) | Deep-graded low-NOx burning system in low-temperature plasma direct-current pulverized coal furnace | |
| CN104974797A (en) | Multifunctional coal gasification burner for two-stage type dry coal powder entrained flow gasification furnace | |
| CN102364248B (en) | Novel low temperature plasma direct-current pulverized coal ignition combustor | |
| CN109931597B (en) | Fuel staged gasification and low NOXCombustion boiler | |
| CN103277792A (en) | Plasma pulverized coal burner | |
| CN109868160B (en) | Plasma nozzle for gasifying coal water slurry, gasifier and gasification method | |
| CN103244954B (en) | Plasma heavy oil burner | |
| CN104987889B (en) | A kind of two-period form entrained flow gasification method | |
| CN110371927B (en) | Ignition combustion device of natural gas reforming hydrogen production device | |
| CN112443833B (en) | Pulverized coal fired boiler with bottom-mounted burner and control method thereof | |
| CN103398397A (en) | Combustion system of boiler and combustion method implemented by aid of system | |
| CN203298293U (en) | Plasma heavy oil burner | |
| CN209588041U (en) | A kind of cement kiln plasma strengthening spiral flame inspissator | |
| CN106545853A (en) | It is a kind of that there is low NOXAnd the low calorific value coal gasification gas burner of steady combustion function | |
| WO2020088567A1 (en) | Pulverized coal boiler with bottom-arranged combustor, and control method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20130928 |