CN2326861Y - Plasma ignition device for directly igniting coal-ash boiler of power station - Google Patents
Plasma ignition device for directly igniting coal-ash boiler of power station Download PDFInfo
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- CN2326861Y CN2326861Y CN 98202919 CN98202919U CN2326861Y CN 2326861 Y CN2326861 Y CN 2326861Y CN 98202919 CN98202919 CN 98202919 CN 98202919 U CN98202919 U CN 98202919U CN 2326861 Y CN2326861 Y CN 2326861Y
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Abstract
The utility model relates to a plasma ignition device for directly igniting a coal-ash boiler in a power station, comprising a burner, a plasma transmitting device and a power supply. The utility model is characterized in that the burner is provided with an overfire air transmission tube (2), a primary air main (3) for the transmission of primary coal powder flow, a primary air powder transmission tube (10) for ignition, and a tube (12) with a plasma fire source inside; the parts are permanently installed into integrated structure orderly by mutually sheathing in draw-in coaxial step ladder type. A plasma torch (6) is converged on the front part and extended on the rear part; the plasma torch (6) is fixed on the front end of the tube (12) with a plasma fire source inside; a plasma emission gun is arranged in the tube (12) with a plasma fire source inside.
Description
The utility model discloses a plasma ignition device for directly lighting power plant pulverized coal boiler, its mainly used directly lights power plant pulverized coal boiler including lean coal, in addition, when the peak regulation of power plant low-load operation, is used for the stable combustion.
At present, fuel oil is adopted to start ignition in the ignition modes of domestic and foreign power station boilers, for example, power stations in China, the ignition oil is started by 180 ten thousand tons every year, which is converted into RMB (more than 50 hundred million yuan), and in addition, the peak regulation of large-capacity units is also imperative along with the increasing of the capacity of a power grid and the capacity of a single machine in the power industry in China. The peak regulation of the power grid generally adopts three modes, namely a two-shift system is adopted, namely the power grid is stopped at 22 o 'clock at night and started at 6 o' clock in the morning; secondly, a low-load stable combustion mode is adopted (the mode is adopted in China, and the main purpose is to overcome the serious damage to equipment caused by frequent start and stop), and the low-load stable combustion index is that oil feeding is adopted for combustion supporting when the load of a boiler using lean coal is below 50%; the third way is to establish a large-scale energy storage hydropower station to solve the problem of power consumption in the valley of power consumption, but the third way needs to be implemented by a huge amount of capital of billions of yuan.
In the face of the worldwide energy crisis, particularly in the poor oil country, the invention of the oil for ignition starting and low-load stable combustion of the utility boiler in a non-traditional way is urgently needed. The method not only accords with the instruction spirit of the traffic energy department of the design and commission in 97 years 'Chinese energy', the China is a country with abundant coal resources and relatively short petroleum resources, the substitution of coal for oil is a very important energy policy, the research, development, popularization and application of the technology and the product of substituting coal for oil are part of the long-term energy strategy which is being executed, but also brings remarkable economic and social benefits to China and has important significance for energy conservation all over the world.
The use of high temperature plasma to solve the above problems began as early as the sixties. The American C-E company, the B-W company, the West House company, the original Soviet Union, the Australian Pacific International electric Power company, the Qinghua university of China, the Halbin boiler plant, the Wuhan boiler plant and other units make great contribution to the research. Since the eighties, they have continued to complete laboratory and industrial tests using plasma technology to directly ignite coal dust. Among them, in 1995, the international electric power company of the pacific australia successfully completed the manufacture of commercial products on a 30-ten-thousand-watt utility boiler, but the fuel used in the products was high-quality coal with a volatile content of more than 25%; most of China burns lean coal, so the product is not suitable for China. In the end of 1995, the plasma ignition device for the pulverized coal boiler of the power station, which is invented by the original soviet union, directly ignites the lean coal of copper and Sichuan with 13% of volatile matter and 4775 kilocalories/kilogram of heat value in the Bao chicken power plant in China, but only normally operates for zero eighths of three hours, namely the device is damaged and stops working; the plasma emission device can not work reliably in a high-temperature and high-pressure environment for a long time, particularly can not be used on a plasma ignition device for directly igniting a pulverized coal boiler of a power station reliably for a long time, the electrode has the problems of core digging, slag dropping and unstable current in the combustion process, an insulating layer (cooler) made of bakelite is broken down at a high temperature to cause short circuit, and joints for conveying water, electricity and gas are loosened for many times to cause faults; the volute burner is adopted to feed powder, and the defects of severe burning red of the volute, coking on the wall surface, severe abrasion, short service life and the like exist.
The utility model aims at providing a plasma ignition device for directly lighting power plant pulverized coal boiler, it has can stably apply including directly lighting the power plant pulverized coal boiler including the inferior coal for a long time.
The purpose of the utility model is realized like this: a plasma ignition device for directly igniting a pulverized coal boiler of a power station comprises a burner, a plasma emission gun and a power supply, wherein the burner is provided with a pipe for conveying secondary air, a primary air pipe for conveying main pulverized coal flow, a pipe for conveying primary air powder for ignition, a pipe internally provided with a plasma ignition source, and a coaxial stepped internally-contracted sleeve fixed and installed integrated structure in sequence; or a pipe for conveying high-temperature steam is coaxially and fixedly sleeved between the primary air pipe for conveying the main pulverized coal flow and the pipe for conveying the primary air powder for ignition;
the front ends of the pipe for conveying the high-temperature steam and the pipe forconveying the primary air powder for ignition are sealed, the front end of the pipe for conveying the primary air powder for ignition is provided with a steam guide hole, and the total area of the steam guide holes is approximately equal to the annular end area of the pipeline for conveying the high-temperature steam;
the front end of the primary air pipe for conveying the main pulverized coal flow is provided with a secondary air diversion hole, and the total area of the secondary air diversion holes is approximately equal to the area of the annular end of the pipeline for conveying the secondary air;
the plasma emission gun is provided with an electrode, a conductive mounting seat, a conductive tube, a conductive gasket, an insulating material, a shell, a bare head wire and an anti-loosening joint, wherein the shell is provided with an air inlet pipe; cooling through holes can be formed in the conductive mounting seat and the electrode;
the insulating material filled between the conductive tube and the shell is a group of high-alumina insulating ceramic tubes or high-alumina insulating ceramic tubes sintered with high-temperature glaze, and the insulating material filled between the conductive gasket, the bare-head lead and the shell is a high-temperature resistant rubber insulating bush;
the anti-loosening joint is composed of an outer nut, a joint, a base plate and a spring, the spring is arranged between the joint and the base plate, an anti-loosening spring clip is fixed at the end of the outer nut, the joint penetrates through the outer nut and is propped against the base plate of the pushing high-aluminum insulating ceramic tube, the tail end of the shell is provided with a thread, a circle of tooth-shaped groove is formed in the position, corresponding to the anti-loosening spring clip, of the lower end of the thread, and a bare-head wire penetrates through the joint, thebase plate and the.
The utility model has the main advantages that:
as is known, the inferior coal is mainly characterized by high ash content (more than 50 percent), high moisture content, low calorific value and low ash melting point; the boiler using such coal has problems of poor combustion characteristics, delayed ignition, unstable combustion, reduced thermal efficiency, insufficient output, etc.; the problem with high ash content is that the heating surfaces become fouled, reducing the availability of the equipment. Because the utility model adopts a reasonable method for arranging the pneumatic layout, the invention provides a full direct current burner and a high-temperature high-pressure plasma emission gun, and solves the problems existing in burning inferior coal.
1. Plasma ignition device and traditional fuel oil system expense are relatively:
unit capacity (ten thousand kilowatts) 10203050
Required oil system equipment cost (ten thousand yuan) 60080010001200
Using plasma ignition means (stage) 4688
Using plasma ignition means
Required cost (ten thousand yuan) 200300400400
Cost saving (ten thousand yuan) 400500600800
2. Plasma ignition device and conventional fuel oil system expense are relatively:
according to the calculation of data at the end of 1997, the total installed capacity of thermal power generating units of the national power system is as follows: 1.88 hundred million kilowatts, estimated to 940 standard 20 kilowatt units; the oil system of the 20-ten thousand kilowatt unit is two layers of 8 oil guns, the output of a single oil gun is 1.5 tons/hour, and the following estimation is carried out:
A. the oil for ignition and stable combustion in the national electric power system is about 150-180 ten thousand tons/year, and the comprehensive cost is 45-54 million yuan RMB/year according to 3000 yuan/ton;
by adopting the plasma ignition device of the utility model, the cost of coal consumption and power consumption is only about 12 percent of the oil consumption, and is about 5.4 to 6.5 million yuan RMB/year; the cost is saved by 39.6 to 47.5 hundred million yuan RMB/year;
B. plasma ignition device effect in the electric wire netting peak shaver:
along with the increase of china's electric wire netting capacity and unit capacity day by day, the peak shaver of large capacity unit is imperative, solves the power consumptive problem of electric wire netting low ebb and still remains the subject that the world people paid attention to, below estimate to the national conditions of china, it is visible the utility model discloses a show the advantage:
(1) peak shaving was achieved using a two shift system: (frequent start in this way, which would significantly reduce the life of the equipment)
The method comprises the following steps that 50% of full power generation and 50% of peak shaving are carried out in China, namely 20-point shutdown is carried out, the power generation is carried out at 6:00 in the morning of the next day, and the power generation is carried out at 8:00, namely 470 units of 20 ten thousand kilowatts work for 300 days in a year;
estimating the oil consumption cost: q1=57.7 billion yuan/year
Adopt the plasma ignition device, the coal consumption expense: q2=6.77 billion/year
Electricity consumption cost: q3=0.388 yen/year
The cost of adopting the oiland adopting the utility model discloses the ratio of the expense is:
(q2+q3)/q1=12％
the energy-saving cost is as follows: q1-q2-q3=50.6 yen/year;
the above estimate is essentially the same as the national statistics of 54 billion dollars per year.
(2) And (3) carrying out power grid peak regulation by adopting low-load stable combustion: (in this way, good protection of the equipment)
The specification requires that the load is thrown to 30% at every 22 o 'clock, a layer of 4 multiplied by 1.5 tons/hour oil gun is thrown at the moment, the oil gun is started at 6 o' clock in the morning, the oil gun is fully distributed according to 50% in the whole country, the peak load is regulated according to 50%, and 470 machines calculate:
estimating the oil consumption cost: q1=203 billion/year
Adopt the plasma ignition device, the coal consumption expense: q2=27 billion/year
Electricity consumption cost: q3=1 billion/year
The cost of adopting the oil and adopting the utility model discloses the ratio of the expense is:
(q2+q3)/q1=14％
the energy-saving cost is as follows: q1-q2-q3=175 yen/year;
(3) cost recovery case:
a adopts a two-shift system, which is the recovery cost of 2 months;
and B, low-load operation is adopted, and the recovery cost is 1 month.
3. Because the utility model discloses a combustor among the plasma ignition device has adopted full direct current coaxial ladder step by step control formula pneumatic overall arrangement, has delayed aviation Laval nozzle and boundary layer gas film cooling technique, establish cascaded speed flow field, in order to guarantee to roll up step by step and inhale and mix and lead to the fact a big temperature drop district in the combustor, make the whole combustion process accomplish in the pneumatic flow field of regulation, guarantee that combustor wall temperature does not reach the melting point of ash content, in addition, utilize the isolation of inner gas film to make once wind powder unlikely to strike and rub the combustor wall, therefore, especially when using lean coal, the utility model discloses can successfully directly light lean coal and support stable burning when the low-load; the wall surface of the burner is not coked, the abrasion is small, the service life is long, the powdery fuel is fully and stably combusted, the price is low, and the like.
4. Because the insulating material of the plasma emission gun of the utility model adopts high-alumina ceramics and sinters high-temperature glaze, the whole emission gun can not be punctured at high temperature; the problem that the original Soviet Union adopts bakelite insulation and is punctured for several times at high temperature is solved;
because the electrode of the plasma emission gun is made of refractory metal zirconium or hafnium and the like, the metal evaporation amount is extremely small under the condition of high temperature and large current, in addition, a plurality of through holes are drilled in the cylindrical electrode, all high-speed air carriers are changed into plasma after the electrode is cooled, the service life of the ignition gun is greatly prolonged, and a series of defects caused by the adoption of a graphite electrode in the original Soviet Union product are overcome;
the conductive mounting seat of the electrode can be disassembled and replaced, the use is very convenient, and the problem thatthe electrode of the charged transmission polished rod is unsafe is avoided;
the conductive path of the emission gun adopts a conductive tube and a conductive sleeve to send current of 200-600 amperes from a rectifying device to an electrode ignition end, and forms high-temperature (4000-5000 ℃) electric arc with an anode spray tube, and meanwhile, cold air from an air inlet pipe also cools the whole conductive path and the electrode through an air inlet hole, a tube core and a cooling through hole; the problem that the outer surface of the air-cooled electrode adopted by the original Soviet Union accelerates the oxidation of the electrode at high temperature is solved;
the anti-loosening spring clip fixed on the outer nut is rotated to a position, and the clip just falls into the tooth-shaped groove, so that a good anti-loosening effect is achieved; the problem of the ordinary screwed joint of former soviet union design, become flexible many times, leak water, leak gas and can not use in the course of the work is solved.
FIG. 1 is a schematic view of a burner of the plasma ignition device according to the present invention;
FIG. 2 is a schematic view of a plasma emission gun in the plasma ignition device according to the present invention;
fig. 3 is a schematic view of the plasma ignition device of the present invention.
The invention is further described by the following examples in conjunction with the accompanying drawings:
example 1:
a plasma ignition device for directly igniting a pulverized coal boiler of a power station comprises a plasma burner, an emission gun and a power supply;
the DC power supply supplies current to the emission gun, the electric arc emitted by the emission gun changes air or inert gas into plasma arc, the plasma arc directly ignites the coal powder in the burner, and the burner continuously sends the coal to the hearth, thereby achieving the purpose of warming the furnace.
As shown in fig. 1, the burner has a pipe 2 for conveying secondary air, a primary air pipe 3 for conveying main pulverized coal flow, a pipe 8 for conveying high-temperature steam, a pipe 10 for conveying ignition primary air powder, a pipe 12 for containing a plasma ignition source, and a coaxial ladder-shaped pipe 4, a primary air pipe 7 for conveying main pulverized coal flow, a pipe 9 for conveying high-temperature steam, and a pipe 11 for conveying ignition primary air powder;
the pipeline 4 for conveying secondary air, the primary air pipeline 7 for conveying main pulverized coal flow, the pipeline 9 for conveying high-temperature steam and the pipeline 11 for conveying primary air powder for ignition are all annular pipelines;
the end of the pipeline 4 for conveying secondary air is connected with the primary air pipe 3 for conveying main pulverized coal flow through an annular baffle 13, the end of the primary air pipeline 7 for conveying main pulverized coal flow is connected with the pipe 8 for conveying high-temperature steam through an annular baffle 13, the end of the pipeline 9 for conveying high-temperature steam is connected with the pipe 10 for conveying ignition primary air powder through an annular baffle 13, the end of the pipeline 11 for conveying ignition primary air powder is connected with the pipe 12 internally provided with a plasma ignition source through an annular baffle 13, and the concrete connection can adopt a screw fastening connection mode, namely, all pipelines are sequentially coaxially sleeved and fixedly installed into an integral structure according to a step type;
the secondary air pipe 2 is provided with a secondary air F2 inlet, the primary air pipe 3 for conveying the main pulverized coal flow is provided with a primary air F1 inlet for the main pulverized coal flow, the pipe 8 for conveying high-temperature steam is provided with a high-temperature steam Fh inlet, and the pipe 10 for conveying the primary air powder for ignition is provided with a primary air powder Fd1 inlet;
the front ends of a pipe 8 for conveying high-temperature steam and a pipe 10 for conveying primary air powder for ignition are sealed, and a plurality of rows of steam guide holes 5 vertical to the axis are uniformly formed in the front end of the pipe 10 for conveying the primary air powder for ignition; the total area of all the annular steam diversion holes 5 is approximately equal to the annular end area of the pipeline 9 for conveying high-temperature steam; so as to reduce the flow resistance of the gas; under the condition that the volatile content of the coal is higher, a high-temperature steam pipeline 9, namely a pipe 8 for conveying high-temperature steam, can be removed;
or the front ends of the pipe 8 for conveying the high-temperature steam and the pipe 10 for conveying the primary air powder for ignition are not closed, the steam diversion hole 5 is not opened, and the purpose of inhibiting expansion can be achieved by changing the pressure of the steam;
the front ends of a pipe 2 for conveying secondary air and a primary air pipe 3 for conveying main pulverized coal flow are closed, a plurality of rows of secondary air guide holes 1 vertical to the axis are uniformly formed in the front end of the primary air pipe 3 for conveying the main pulverized coal flow, and similarly, the total area of all annular secondary air guide holes 1 is approximately equal to the annular end area of a pipeline 4 for conveying the secondary air, so that the flowing resistance of air is reduced;
or the front ends of the pipe 2 for conveying secondary air and the primary air pipe 3 for conveying main pulverized coal flow are not closed, and no diversion hole is formed, so that the secondary air F2 can be used for inhibiting the expansion of flame and preventing pulverized coal from coking on the wall surface of the combustor by changing the pressure of the secondary air;
the anode plasma jet tube 6 is a jet tube which converges and diffuses firstly, the material can be red copper, the red copper is cooled by adopting a conventional water cooling mode, and the anode plasma jet tube is fixed at the front end of a tube 12 internally provided with a plasma emission gun; or the edge of the plasma spray pipe 6 is provided with a circle of annular holes through which the primary air powder can flow, and the spray pipe 6 is fixedly welded on a pipe 10 for conveying the primary air powder for ignition.
As shown in fig. 2, the gun has an electrode 14, a conductive mounting base 16, a fastening sleeve 17, a conductive tube 18, a contact point, a lead 27, a check joint 28, a ceramic insulating tube 21, a gasket 19, an insulating bush 24, a shell 20 and an air inlet pipe 23;
the electrode 14 is fixed in the conductive sleeve 15 to form a combined electrode (the conductive sleeve 15 is made of high conductive material such as copper tube), the electrode 14 is made of refractory metal, but hafnium, zirconium, molybdenum and other materials, according to the air flow, a plurality of cooling through holes 33 are drilled in the cylindrical micro-loss electrode 14, and the conductive mounting seat 16 is also provided with the cooling through holes 33 (or a plurality of cooling through holes 33 are drilled in the electrode 14, and the conductive mounting seat 16 is not provided with the cooling throughholes 33; or the cooling through holes 33 are not drilled in the electrode 14, and the cooling through holes 33 are formed in the conductive mounting seat 16), and high-speed air from the air inlet pipe 23 is converted into plasma after being cooled by the counter electrode;
the conductive tube 18 is a copper tube, which is provided with a cold air inlet 32, the shell 20 is provided with an air inlet pipe 23, and the air inlet pipe 23 can be welded on the shell 20; cold air enters the conductive tube core from the air inlet pipe 23 through the air inlet hole 32 and is discharged from the cooling through hole 33, so that the whole gun body conductive passage and the electrode are cooled;
the combined electrode is fixed on the conductive mounting seat 16 through a screw (or other detachable fixing modes), the conductive mounting seat 16 and the fastening sleeve 17 can be in screw or threaded connection, the conductive tube 18 is arranged in the shell 20, one end of the conductive tube is welded on the fastening sleeve 17, the other end of the conductive tube is connected with the front contact point 22 and the rear contact point 29 through a conductive gasket 31, the bare conductor 27 is welded on the rear contact point 29 and is locked and fixed by the anti-loosening joint 28;
a high-temperature-resistant insulating material is filled between a conductor formed by sequentially connecting the conductive tube 18, the conductive gasket 31 and the bare conductor 27 and the shell 20, the high-temperature-resistant insulating material is an annular high-alumina ceramic insulating tube 21 (the gun is ensured to have a resistance of not less than 3000V at a high temperature of 800 ℃) with high-temperature glaze sintered, a group of ceramic insulating tubes 21 are mutually sleeved, a gasket 19 can be added at a gap for fixing, the shell 20 is ensured to be uncharged, and an insulator filled among the conductive gasket 31, the bare conductor 27 and the shell 20 can also be an insulating rubber bushing 24;
the anti-loosening joint 28 consists of an outer nut 25, a joint 26, a backing plate 34 and a spring 35, wherein the spring 35 is arranged between the joint 26 and the backing plate 34, and a group of anti-loosening spring clips 30 are welded at the end head of the outer nut 25;
the tail end of the shell 20 is provided with a thread, and the lower end of the thread is provided with a circle of tooth-shaped grooves corresponding to the anti-loosening spring clips 30;
the anti-loose joint 28 is arranged at the tail end of the shell 20, when the outer nut 25 is screwed, the joint 26 tightly pushes the backing plate 34, the high-alumina ceramic insulating tube 21 is further extruded, the front contact point and the rear contact point are tightly pressed and tightly contacted with the conductive tube 18, the whole conductive path is connected, and after the anti-loose joint is screwed in place, the anti-loose spring clip 30 at the tail end of the shell 20 is just clamped and fixed in the tooth-shaped groove at the end part of the shell 20 and cannot be loosened;
as shown in fig. 3, the sleeve 36 is inserted into the tube 12 housing the plasma torch fastened in the sleeve 36 by a screw coupling.
The utility model discloses a theory of operation and process are:
the plasma ignition device of the utility model is used for directly igniting a power station pulverized coal boiler including lean coal, and is directly arranged in a secondary air pipe of the boiler or on the outer wall of the boiler, and a burner secondary air pipeline 4 of the plasma ignition device is connected with a prefabricated pipe of a boiler wall;
high-capacity current (such as 200-600 amperes) fromthe rectifying device is sent to a firing end through a lead 27 on the plasma emission gun through a contact point, a conductive tube 18, a conductive mounting seat 16 and a conductive sleeve 15 on an electrode, a 25000 volt high-frequency coil is used for breaking down a gap between the electrode 14 and a spray pipe 6 to form electric arcs, the electric arcs are blown into a combustor I area by pressure cold air or inert gas from an air inlet pipe 23, and the air or the inert gas is mixed with the electric arcs to form plasma arcs; the divergent expansion at the mouth of the nozzle 6 is in a reverse cone shape (the reverse cone flame is very beneficial to ignition), the expanded reverse cone flame is restrained by the primary air powder Fd1 for ignition output by the pipeline 11 (the expansion of the plasma flame can be controlled by adjusting the total pressure of the primary air powder in the pipeline 11);
when the volatile components of the primary air powder for ignition are ignited by the plasma flame, secondary expansion is carried out again, and the expansion flow is also inhibited by high-temperature steam Fh output from the pipeline 9 ring to the steam guide hole 5 (similarly, the expansion of the volatile components of the air powder can be controlled by adjusting the total pressure of the steam in the pipeline 9, and the temperature in the whole combustor can be controlled).
The burning wind powder volatile matter is ignited again to the main coal powder flow F1 sent by the pipeline 7, and the secondary expansion flow is restrained by the secondary wind F2 sent from the pipeline 4 to the secondary wind diversion hole 1; if the front end of the duct 4 for conveying the secondary air is not closed, the expansion flow is directly restrained by the secondary air F2 output from the duct 4 (similarly, the expansion can be controlled by adjusting the total pressure of the secondary air in the duct 4);
the high-temperature steam Fh flowing in the duct 9 and the secondary air F2 flowing in the duct 4 can suppress the expansion of the flame and form a large temperature drop zone in the wall surface of the burner. The formation mechanism is as follows: when the gas in the pipe flows to the end of the pipeline, the gas is blocked by the closed baffle plate, the dynamic pressure is reduced, the static pressure is increased, the gas is forced to flow out from the boundary layer diversion hole, the combustor is cooled, a large temperature drop area is formed, the temperature of the combustor is far lower than the melting point of the ash content of the pulverized coal, in addition, the primary air powder is not close to the wall surface of the combustor due to the influence of vertical flow, and the coking is inhibited.
In the above-mentioned process, plasma arc ignites the wind-powder mixture of primary wind of ignition coal powder in zone I, and the thermalization is completed in zone IIChemical treatment (coal gasification), i.e. (ii) a And igniting the volatile component of the main pulverized coal in the zone III, and converging the volatile component of the main pulverized coal and secondary air to be pushed into a hearth to be burnt out. The whole continuous combustion process completes the temperature rise of the boiler.
Adopts twice ignition (namely ignition by plasma arc and primary air coal dust volatilization are first ignition, and the energy of the first ignition is added with CO + H after coal gasification2The primary wind of the main pulverized coal is ignited by the combustion energy of the primary pulverized coal to be the secondary ignition. ) Although the structure is complicated, the power of the rectifying starting power supply of the plasma igniter can be greatly reduced, and the service life of the device is prolonged.
The flame stabilizing mechanism of the burner is that the electrolytic ionization process of electric arc is utilized to change air into plasma flow, and in addition, the added chemical heat treatment process of coal is equal to the addition of the volatile component (CO + H) required in equivalent combustion process2) The amount of the carbon dioxide increases the ignition heat supply, and a stable ignition source is established, so that the plasma arc and the volatile components of the coal and the high-calorific-value CO + H obtained by the chemical heat treatment of the coal2The flame formed jointly establishes a two-high one-low torch region, namely a high-temperature, high-speed and low-pressure plasma flow torch region, and the central low-pressure region realizes entrainment and mixing effects on two primary air powders, so that a good flame stabilizing condition is created. The designed combustor adopts a full direct current pneumatic layout and a four-layer stepped velocity flow field, wherein two layers are main flow fields, namely ignition primary air and main pulverized coal primary air; the two layers are control flow fields, namely steam and secondary air; the combustion of the two expansion flows is controlled within a specified range by the forced compression action of steam and secondary air in the two layers of control flow fields, so that the technical difficulties of 'wall brushing' friction, coking and the like in the pulverized coal combustion process are solved.
Claims (10)
1. A plasma ignition device for directly igniting a pulverized coal boiler of a power station comprises a burner, a plasma emission device and a power supply, and is characterized in that: the burner is provided with a pipe (2) for conveying secondary air, a primary air pipe (3) for conveying main pulverized coal flow, a pipe (10) forconveying ignition primary air powder, a pipe (12) internally provided with a plasma ignition source, and a coaxial stepped internal shrinkage sleeve-fixed integrated structure in sequence, wherein the plasma spray pipe (6) is a spray pipe which converges and diffuses firstly, the plasma spray pipe (6) is fixed at the front end of the pipe (12) internally provided with the plasma ignition source, and a plasma emission gun is arranged in the pipeline (12) internally provided with the plasma ignition source.
2. The plasma ignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 1, characterized in that: a pipe (8) for conveying high-temperature steam is coaxially sleeved and fixedly arranged between a primary air pipe (3) for conveying main pulverized coal flow and a pipe (10) for conveying ignition primary air powder.
3. The plasma ignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 2, characterized in that: the front ends of the pipe (8) for conveying high-temperature steam and the pipe (10) for conveying the primary air powder for ignition are closed, the front end of the pipe (10) for conveying the primary air powder for ignition is provided with a steam guide hole (5), and the total area of the steam guide hole (5) is approximately equal to the annular end area of the pipeline (9) for conveying high-temperature steam.
4. A plasma ignition device for direct ignition of a pulverized coal boiler of a power plant according to claim 1 or 3, characterized in that: the front ends of a pipe (8) for conveying secondary air and a primary air pipe (3) for conveying main pulverized coal flow are sealed, a secondary air diversion hole (1) is formed in the front end of the primary air pipe (3) for conveying the main pulverized coal flow, and the total area of the secondary air diversion hole (1) is approximately equal to the annular end area of a pipeline (4) for conveying the secondary air.
5. A plasma ignition device for direct ignition of a pulverized coal boiler of a power plant according to claim 1, 2 or 3, characterized in that: the plasma emission gun comprises an electrode (14), a conductive mounting seat (16), a conductive tube (18), a conductive gasket (31), an insulating material (21), a shell (20), a bare-end lead (27) and a check joint (28), an air inlet pipe (23) is arranged on a shell (20), an air inlet hole (32) is formed in a conductive pipe (18), a cooling through hole (33) is formed in a conductive mounting seat (16) or an electrode (14), the air inlet pipe (23) is communicated with the air inlet hole (32) and the cooling through hole (33), the electrode (14) is connected with the conductive mounting seat (16), the conductive pipe (18), a conductive gasket (31) and a bare-head wire (27) are sequentially connected and mounted in the shell (20), an insulating material (21) is filled between the conductive pipe (18) and the bare-head wire (27), the front end of the conductive pipe (18) is connected with the conductive mounting seat (16), the tail end of the shell (20) is connected with an anti-loosening joint (28), and the bare.
6. The plasma ignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 4, characterized in that: the plasma emission gun comprises an electrode (14), a conductive mounting seat (16), a conductive tube (18), a conductive gasket (31), an insulating material (21), a shell (20), a bare-end lead (27) and a check joint (28), an air inlet pipe (23) is arranged on a shell (20), an air inlet hole (32) is formed in a conductive pipe (18), a cooling through hole (33) is formed in a conductive mounting seat (16) or an electrode (14), the air inlet pipe (23) is communicated with the air inlet hole (32) and the cooling through hole (33), the electrode (14) is connected with the conductive mounting seat (16), the conductive pipe (18), a conductive gasket (31) and a bare-head wire (27) are sequentially connected and mounted in the shell (20), an insulating material (21) is filled between the conductive pipe (18) and the bare-head wire (27), the front end of the conductive pipe (18) is connected with the conductive mounting seat (16), the tail end of the shell (20) is connected with an anti-loosening joint (28), and the bare.
7. The plasma ignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 5, characterized in that: cooling through holes (33) are formed on the conductive mounting seat (16) and in the electrode (14).
8. The plasma ignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 6, characterized in that: cooling through holes (33) are formed on the conductive mounting seat (16) and in the electrode (14).
9. The plasma ignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 7, characterized in that: the insulating material (21) filled between the conductive tube (18) and the shell (20) is a group of high-alumina insulating ceramic tubes or high-alumina insulating ceramic tubes sintered with high-temperature glaze, wherein the insulating material (21) filled between the conductive gasket (31), the bare-end lead (27) and the shell (20) is a high-temperature resistant rubber insulating bush (24).
10. The plasmaignition device for directly igniting a pulverized coal boiler of a power plant as claimed in claim 9, characterized in that: the anti-loosening joint (28) is composed of an outer nut (25), a joint (26), a base plate (34) and a spring (35), the spring (35) is arranged between the joint (26) and the base plate (34), an anti-loosening spring clip (30) is fixed at the end of the outer nut (25), the joint (26) penetrates through the outer nut (25) and is propped against the base plate (34) of the pushing high-aluminum insulating ceramic tube, the tail end of the shell (20) is provided with a thread, a circle of tooth-shaped groove is formed in the position, corresponding to the anti-loosening spring clip (30), of the lower end of the thread, a bare-head lead (27) penetrates through the joint (26), the base plate (34) and the high-aluminum insulating ceramic tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98202919 CN2326861Y (en) | 1998-03-31 | 1998-03-31 | Plasma ignition device for directly igniting coal-ash boiler of power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98202919 CN2326861Y (en) | 1998-03-31 | 1998-03-31 | Plasma ignition device for directly igniting coal-ash boiler of power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2326861Y true CN2326861Y (en) | 1999-06-30 |
Family
ID=33959874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98202919 Expired - Lifetime CN2326861Y (en) | 1998-03-31 | 1998-03-31 | Plasma ignition device for directly igniting coal-ash boiler of power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2326861Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538004A (en) * | 2010-12-11 | 2012-07-04 | 水煤浆气化及煤化工国家工程研究中心 | Direct electric ignition method and device for entrained bed gasification furnace |
| CN116293786A (en) * | 2023-04-17 | 2023-06-23 | 鑫泓淼机械科技(山东)有限公司 | Contact type efficient electric energy converter |
-
1998
- 1998-03-31 CN CN 98202919 patent/CN2326861Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538004A (en) * | 2010-12-11 | 2012-07-04 | 水煤浆气化及煤化工国家工程研究中心 | Direct electric ignition method and device for entrained bed gasification furnace |
| CN116293786A (en) * | 2023-04-17 | 2023-06-23 | 鑫泓淼机械科技(山东)有限公司 | Contact type efficient electric energy converter |
| CN116293786B (en) * | 2023-04-17 | 2024-03-08 | 鑫泓淼机械科技(山东)有限公司 | Contact type efficient electric energy converter |
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Owner name: LONGYUAN ELECTRIC TECHNOLOGY CO., LTD., YANTAI Free format text: FORMER NAME OR ADDRESS: LONGYUAN ELECTRIC POWER BURNING + CONTROLLING ENGINEERING CO., LTD., YANTAIDEVE |
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| CP01 | Change in the name or title of a patent holder |
Patentee after: Yantai Longyuan Electric Power Technology Co., Ltd. Patentee before: Longyuan Electric Power Combustion Control Engineering Co., Ltd., Yantai Develop |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |