CN205332171U - Water gas is produced and is burnt integration combustion apparatus - Google Patents

Abstract

The utility model relates to a water gas is produced and is burnt integration combustion apparatus, mainly use on the boiler, combustion apparatus is including setting up on the base, be equipped with the combustion chamber of furnace arch among the inside furnace, the setting is in the combustion chamber, the grate that is equipped with the primary zone of furnace arch below, the setting links to each other with grate one end outside the combustion chamber deposits the feed bin of blue carbon, the connection is used for the fuel pusher to the blue carbon of propelling movement on the grate on the feed bin, the setting is in the grate below, a plurality of independent plenums for $facing combustion chamber supplying air on the grate, characterized by: independent plenum separately with grate sealing connection, the preceding wall of combustion chamber, the furnace roof is inside and the inside condenser tube that is equipped with of furnace arch, the grate below is equipped with and is used for supplying with the steam pipe that generates the required saturated steam of water gas to the primary zone on the grate. Adopt the utility model provides a combustion apparatus, the thermal efficiency is high, safety ring protects, the operation maintenance cost is low.

Description

A kind of water gas produces and burns Integrated Combustion equipment

Technical field

This utility model belongs to boiler technology field, is specifically related to a kind of water gas and produces burning Integrated Combustion equipment。

Background technology

China is the country of the rich coal few gas of few oil, requirement due to environmental protection, having forbidden fire coal in the greater part in the whole nation, the boiler user of nationwide much is required to change into oil-burning gas-fired boiler, and the production cost of such manufacturing enterprise relatively coal-burning boiler improves 4 times incessantly。

Boiler smoke discharge exceeds standard and fuel (oil, gas, coal) not direct relation in fact, but has direct relation with combustion apparatus and fume treatment auxiliary。Whether after-flame is relevant with combustion apparatus with fuel for such as black smoke；Sulfur dioxide (SO2) emissions, sulfur content in fuel in flue gas are relevant with desulphurization plant；Discharged nitrous oxides in flue gas is relevant with ignition temperature, control NO_x formation and denitration device；Dust in flue gas is relevant with the structure of boiler and cleaner, etc.。Want emission compliance, reduce the expense of discharge, first will from this Sources controlling that burns, then the clean combustion technique that will have had。The combustion system of existing coal-burning boiler all deposits deficiency structurally, and burning is also direct-fired, and fire box temperature is low causes non-complete combustion of fuel, and environment causes very big pollution, simultaneously because incomplete combustion also results in very big energy waste。

Distinct issues are thus had to put in face of us, want Sources controlling fume emission, first will there be a kind of maturation, clean combustion technique widely used, efficient and corresponding equipment, solve environmental protection and the power saving of fire coal, and equipment is safe and reliable to operation, maintenance rate is low。

Deficiency existing for the combustion system of conventional boiler:

(1) shortcoming of chain grate boiler and reciprocating-grate boiler:

1, owing to the grate wind chamber of motion seals bad, each air compartment alters wind, and have gap between fire grate both sides and cant board, make fire grate both sides intake bigger than intake in the middle of fire grate, fire grate cloth wind is uneven, makes that burning is uneven, incomplete combustion, ash content carbon high, boiler thermal output is low, chimney over-emitting black exhaust, operating cost are high。

2, fire grate maintenance rate is high。

(2) pulverized-coal fired boiler shortcoming:

1, coal dust cost is high, and coal dust is ground by mill house concentration, unified supply, and the price of coal dust reaches 1 ton more than 1000 yuan, and fuel cost is significantly high。

2, operating technology being required height, misoperation can cause furnace implosion and outer quick-fried and Combustion Efficiency of Coal Powder reduction, has potential safety hazard。

3, the high easily coking of in-furnace temperature, and it is easily generated nitrogen oxides, so necessary low-temperature burning, cause incomplete combustion。

4, producing substantial amounts of flying dust after burning, it is necessary to flying dust collected by the sack cleaner significantly high by purchase cost and maintenance cost, thus increasing the power of air-introduced machine, increasing electrisity consumption。

5, the quality requirements of coal is significantly high。

6, load range of boiler is low, and Load Regulation is between 70%-100%。

7, flying dust is serious, and ignition temperature controls bad, easily dross, corrosion heating surface on heating surface tube。

8, equipment investment is costly。

(3) shortcoming of CFBB:

1, equipment and boiler room investment cost are high。

2, air distribution plate maintenance rate is high。

3, cyclone separator maintenance rate is high。

4, due to air distribution plate resistance and coal seam resistance, increasing blower power, power consumption increases。

5, can not high-temp combustion, high-temp combustion exists and burns out air distribution plate and burner hearth and hang Jiao, causes that boiler is not normally functioning。

6, producing substantial amounts of flying dust after burning, it is necessary to flying dust collected by the sack cleaner significantly high by purchase cost and maintenance cost, thus increasing the power of air-introduced machine, increasing electrisity consumption。

7, can only burning inferior coal。

(4) oil-burning gas-fired boiler feature:

1, fuel cost is high。

2, the nitrogen oxides discharge capacity in flue gas is high, it is necessary to take off the nitrogen oxides in flue gas with special equipment, buying cost of equipment and cost of use are significantly high。

(5) feature of boiler burning waterpgas as fuel:

Water gas is a kind of high heating value cleaning fuel。Conventional water-gas boiler is to produce water gas, complex process by five-step approach in gas generator, and require over pipelined carry out burning to heat transmission equipment, heat exchange。

The raw material of traditional coal gas boiler water gas two-stage gasifier is coal and steam, produces water gas in gas generator。Principle chemical equationFrom reaction equation it can be seen that carbon and Aquatic product unboiled water coal gas are chemical reactions at high temperature。

Conventional water-gas boiler has the disadvantage in that

1, complex process, danger coefficient are big, easy detonation。

2, not energy-conservation, the thermal efficiency is low, and reason is that water gas consumes heat energy in gas generation process and course of conveying。

3, facility is complicated, and " stove " and " pot " separates, and floor space is big。

4, gas pipeline is easily blocked by coal tar, and the comparison of ingredients of coal tar is complicated, and it is extremely serious that coal tar burning produces the pollutant such as benzopyrene, white carbon black, sulfide, anthracene。

Sum up the weak point of any of the above boiler combustion equipment, it is necessary to design and can guarantee that again boiler output, boiler operatiopn cost are low, substantially produce burn Integrated Combustion technology and relevant device without maintenance rate, the water gas that easy and simple to handle, stable, safe and reliable, boiler room cost is low by clean combustion。

Utility model content

For the defect existed in existing combustion technology, the purpose of this utility model is to provide a kind of water gas and produces burning Integrated Combustion equipment。This equipment is capable of the i.e. product of water gas and namely fires, and sufficient combustion does not produce black smoke, and efficiency of combustion is high, and ash content carbon is low, improves boiler thermal output, and maintenance of equipment rate is low, and operating cost is low, and equipment is safe and reliable to operation。

For reaching object above, the utility model discloses water gas and produce a kind of water gas product burning Integrated Combustion method that burning Integrated Combustion equipment uses, comprise the steps:

(S1) blue carbon is coated with in boiler furnace chimney arch fire grate primary zone in light, make the temperature in described primary zone rise to more than 1100 degree；

(S2) pass into enough air and saturated vapor to described primary zone, make described blue carbon react in described primary zone with described air and described saturated vapor and produce water gas and burn；Quickening along with the described blue carbon in described primary zone and the burning velocity of described water gas, described air and the amount of feeding of described saturated vapor it is gradually increased to described primary zone, accelerate generation and the burning velocity of described water gas, thus reaching to make described water gas namely produce the effect namely fired；The thermal-flame and the unburnt high-temperature flue gas that produce after the described water gas burning in described primary zone enter in burner hearth from the arch mouth of described chimney arch, and under the cooperation of secondary wind in described burner hearth further after-flame。

Further, also including step (S3), in described burner hearth, the high-temperature flue gas in afterburnt enters the part of the pot of boiler for heat exchange。

Further, also include in described step (S2), the described primary zone of described fire grate and the intake in other region are individually adjusted, it is to avoid the described air intake in described other regions of fire grate affects burning and the temperature in described primary zone。

For reaching object above, the technical solution adopted in the utility model is:

A kind of water gas produces and burns Integrated Combustion equipment, including being arranged on base, internal burner hearth is provided with the combustor of chimney arch, it is arranged in described combustor, the fire grate being provided with primary zone below described chimney arch, it is arranged on the outer feed bin depositing blue carbon being connected with described fire grate one end of described combustor, it is connected to the fuel pusher for pushing described blue carbon on described fire grate on described feed bin, it is arranged on below described fire grate, for supplying the some independent air compartment of air to the described combustor on described fire grate, it is characterized in that: described independent air compartment is each tightly connected with described fire grate, the front wall of described combustor, it is provided with cooling water pipe inside the internal and described chimney arch of furnace roof, described fire grate is connected with for supplying the steam pipe generating the saturated vapor needed for water gas to the described primary zone on described fire grate。

Further, described fire grate is fixed water-cooled grate, is divided into preheating zone, primary zone, dregs baking region, and lower section is corresponding respectively is tightly connected the first independent air compartment that intake all can individually adjust, the second independent air compartment, the 3rd independent air compartment。

Further, described steam pipe is arranged in described second independent air compartment。

Further, described chimney arch covers above described primary zone, the refractory material adopting resistance to 1700 degree of high temperature makes, the burner hearth of described chimney arch one end and described combustor collectively forms arch mouth, the area of described arch mouth ensure that the state that combustion space is tiny structure that the primary zone by described fire grate and described chimney arch are constituted, the state of described tiny structure both can guarantee that the temperature that described water gas produces and burning is required can be assembled in the described primary zone below described chimney arch, can guarantee that again the thermal-flame of the described water gas in described primary zone burning generation and high-temperature flue gas flow out in described burner hearth smoothly from described primary zone。

Further, described fuel pusher includes the supporting plate being arranged under described feed bin, is arranged on the scraping wings with hydraulic cylinder on described supporting plate, connects the Hydraulic Station of described hydraulic cylinder。

Further, described combustor is provided with inputting the secondary air inlet of secondary wind in the described burner hearth of described combustor。

Further, described secondary air inlet is arranged on the described furnace roof of described combustor。

The beneficial effects of the utility model have following some:

1. owing to fire box temperature is high, so efficiency of combustion is high, it does not have black smoke, the low 4%-5% of ash content carbon, the not only generation of pollution element from Sources controlling, and also improve the thermal efficiency of the boiler using combustion apparatus provided by the utility model；

2. namely water gas produces and namely fires, and reaches cleaning burning, and technique is simple, save multiple links such as the conventional production of water gas, Pipeline transport, it is therefore prevented that the generation of detonation, equipment is safe and reliable to operation；Water gas two-stage gasifier equipment combines together with the part of " pot " in boiler, and floor space is little, saves the capital expenditure of boiler room；

3. fire grate is the problem that water-cooled grate is absent from burning out, maintenance rate extremely low (almost nil), saves maintenance cost for user；

4. fuel pusher, deslagging device are hydraulic drive, and maintenance rate is extremely low, and periodic replacement sealing ring is just passable, it is not necessary to blowing out and replaceable。Automaticity is high, operates safe, reliable；

5. produce the material choice orchid carbon of water gas, the discharge of sulfur dioxide can be reduced and produce the amount of lime-ash, because the sulfur content in blue carbon is that about about 0.18%-0.2%, cinder content are about about 6.2%-10.49%, so it is substantially reduced the desulfurization expense of flue gas and expense of mucking haulage, and it is very low to buy blue carbon expense；

6. using water gas to produce the boiler burning Integrated Combustion equipment is that monolayer is arranged, boiler room capital cost is low；

7. using water gas to produce the boiler burning Integrated Combustion equipment and do not have the waste of fuel when blowing out, because of burner hearth good airproof performance, do not have air and water vapour supply after blowing out, the blue carbon on fire grate is completely in not fired state。

Accompanying drawing explanation

Fig. 1 is that water gas described in this utility model specific embodiment produces the structure chart burning Integrated Combustion equipment；

In figure: 1-feed bin, 2-scraping wings, 3-hydraulic cylinder, 4-fuel pusher, 5-supporting plate, 6-Hydraulic Station, 7-front wall, 8-furnace roof, 9-secondary wind air inlet, 10-orchid carbon, 11-encircles mouth, 12-fuel bed, the part of 13-" pot ", 14-chimney arch, the independent air compartment of 15-the 3rd, 16-cooling water pipe, 17-high-temperature flue gas, 18-furnace outlet, 19-fire grate, the independent air compartment of 20-first, 21-steam pipe, the independent air compartment of 22-second, the total air inlet of 23-, the part of 24-" stove "。

Detailed description of the invention

Below in conjunction with drawings and Examples, this utility model is further described。

A kind of water gas product burning Integrated Combustion method that burning Integrated Combustion equipment adopts is produced the utility model discloses water gas, producing the raw material used by water gas is blue carbon, saturated vapor, air, chemical reaction is at high temperature occurred to generate water gas, water gas process and carbon molecule gasification, and combustion process。

Blue carbon and oxygen, saturated vapor occur following chemical reaction to produce water gas:

Carbon is met oxygen at high temperature combustion reaction and is generated carbon dioxide: C+O₂=CO₂+ Q, for exothermic process；

Carbon dioxide and carbon react generation carbon monoxide: CO₂+ C=2CO-Q, for endothermic process；

Carbon monoxide and hydrogen: H is produced under water vapour and carbon high-temp₂O+C=CO+H₂-Q

CO+H₂O=CO₂+H₂-Q

Blue carbon is at high temperature endothermic process with saturated steam water generation reaction coal gas, and substantial amounts of heat is released in water gas burning。

It is as follows that water gas provided by the utility model produces the step burning the water gas product burning Integrated Combustion method that Integrated Combustion equipment adopts:

Step S1, blue carbon is coated with in boiler furnace chimney arch fire grate primary zone in light, make the temperature in primary zone rise to more than 1100 degree；

Step S2, adds enough saturated steams and air to primary zone, makes blue carbon and air and saturated vapor react in primary zone generation water gas, and water gas is also directly burnt while producing；Raising along with the blue carbon in primary zone and the quickening of burning velocity of water gas, fire box temperature, it is gradually increased the amount of feeding of the saturated vapor to primary zone and air, accelerate generation and the burning velocity (increasing the generation of water gas and the direct burning of water gas) of described water gas, thus reaching to make water gas namely produce the effect namely fired；The thermal-flame and the unburnt high-temperature flue gas that produce after the water gas burning in primary zone enter in burner hearth (now the temperature in burner hearth is up to more than 1500 degree) from the arch mouth of chimney arch, and under the cooperation of secondary wind in burner hearth further after-flame；While namely water gas produces and namely fires, the air intake avoiding other regions of fire grate affects the burning in primary zone and temperature, and (preheating zone adjacent with primary zone on such as fire grate and dregs baking region have only to the wind that feeding is a small amount of, excessive wind is avoided to enter in burner hearth, it is not involved in burning and returns burner hearth cooling, affect integral combustion effect)。

Step S3, in burner hearth, the high-temperature flue gas in afterburnt enters the part of the pot of boiler for heat exchange。

Produce according to water gas provided by the utility model and burn Integrated Combustion method, the water gas produced directly burns under hot environment (in the burner hearth of such as high temperature) and the cooperation of secondary wind, reach namely to produce the effect namely fired, the temperature of hot environment is up to more than 1500 degree, so high temperature, accelerate the production of water gas, also the directly burning of water gas is accelerated, water gas combustion rate reaches nearly 100%, eliminate black smoke (being mainly white carbon black) in hot environment (burner hearth), thus reaching the effect of cleaning burning, blue carbon burning efficiency is more than 95%, reduce ash content carbon, improve the thermal efficiency of boiler。

This utility model provides and uses above-mentioned water gas to produce a kind of water gas product burning Integrated Combustion equipment burning Integrated Combustion method。Because water gas produces burning, Integrated Combustion method is mainly used on boiler, therefore with boiler embodiments, water gas provided by the utility model is produced burning Integrated Combustion equipment and illustrates。

As shown in Figure 1, a kind of water gas produces and burns Integrated Combustion equipment, (in the present embodiment, combustion apparatus is the part of " stove " in boiler) includes fuel pusher 4, combustor, several independent air compartments, and feed bin 1, fire grate 19, steam pipe 21 form。This combustion apparatus can also connect the part 13 for " pot " in the boiler of heat exchange, constitutes complete boiler structure。

Fire grate 19 is inclined at the bottom of combustor, for fixed water-cooled grate, has the water of flowing, furnace grate tube is effectively cooled down in the furnace grate tube of fire grate 19。Being provided with fire grate segment between furnace grate tube, what can also effectively prevent fuel on fire grate when ensureing good ventilation effect spills (fuel is blue carbon)。Fire grate 19 is divided into preheating zone, primary zone, dregs baking region for the combustion process of blue carbon。

Independent air compartment is arranged on the bottom of fire grate 19, have three (first independent air compartment the 20, second independent air compartments 15 of independent air compartment the 22, the 3rd), it is respectively directed to the preheating zone of fire grate 19, primary zone, dregs baking region, and be tightly connected with fire grate 19 respectively, between each air compartment independent sealed, the situation of wind will not be altered。Such setting ensure that on fire grate 19, each burning block can need to adjust air quantity according to burning, such as a small amount of wind can be given in preheating zone, primary zone can supply enough wind and ensure burning, dregs baking region ensures roasting slag needs can to a small amount of wind, can accomplish inching by louver。The bottom of fire grate 19 is additionally provided with the total air inlet 23 connected with each independent air compartment。

Feed bin 1 is arranged on the entrance of combustor, is used for holding blue carbon 10, is connected with the fire grate 19 in combustor by supporting plate 5。

Fuel pusher 4 includes the supporting plate 5 being arranged on below feed bin 1, being arranged on the scraping wings 2 with hydraulic cylinder 3 on supporting plate 5, connect the Hydraulic Station 6 of hydraulic cylinder 3, hydraulic cylinder 3 can promote scraping wings 2 to be pushed on fire grate 19 by the fuel 10 (by supporting plate 5) in feed bin 1。In the present embodiment, fuel pusher 4 can need to set pusher time and interval time according to boiler load, for Automatic Control。

In the present embodiment, pusher speed is mated with burning velocity, it is ensured that the fuel bed 12 being made up of blue carbon being laid on fire grate 19 does not have tomography, and continuous burning, for full-automatic chain control。

Combustor includes front wall 7, furnace roof 8, chimney arch 14, inside is burner hearth, also including furnace outlet 18, furnace outlet 18 can connect the part 13 for " pot " in the boiler of heat exchange, makes the high-temperature flue gas 17 after water gas burning enter in the part 13 of " pot " and carries out heat exchange。

Chimney arch 14 adopts low and long moulding, it is arranged in the burner hearth of inside of combustor, the primary zone of fire grate 19 is covered, the heat that the burning of such primary zone produces is absorbed by chimney arch 14, the heat absorbed reacts on again fuel bed 12 surface, between fire grate 19 and chimney arch 14, form high-temperature space, create hot conditions to production water gas, promote production and the burning of water gas。Chimney arch 14 adopts the refractory material of resistance to 1700 degree of high temperature to make, it is ensured that chimney arch 14 is durable in use。

One end (one end not contacted with the burner hearth of combustor) of chimney arch 14 and the burner hearth of combustor collectively form arch mouth 11, the area of arch mouth 11 makes to be formed in the primary zone under chimney arch 14 and makes water gas stop and clean-burning micro-vacuum state, it is exactly can guarantee that the temperature that water gas produces and burning is required is assembled in the primary zone below chimney arch 14, the thermal-flame that water gas burning generates can also be made to be detached from primary zone in time with (unburnt) high-temperature flue gas and enter in burner hearth, unburnt high-temperature flue gas (burns herein because of thermal-flame and unburnt high-temperature flue gas in burner hearth after going out to encircle mouth 11 in burner hearth, temperature reaches more than 1500 degree) mix with secondary wind, in high-temperature flue gas, the water gas of residual reaches burning completely (micro-vacuum state makes to have in water gas primary zone under chimney arch 14 enough time of staying to reach to be close to and burn completely at this, the water gas because having little time burning is avoided to enter convection heating surface, coal tar can be formed hang on heating surface when substantial amounts of water gas runs into low temperature heating surface, reduce heat exchange efficiency, also can hang more and more blocking exhaust gases passes because of coal tar), the high-temperature flue gas 17 in afterburnt flows out from furnace outlet 18, enter in pot for heat exchange。

Front wall 7 and furnace roof 8 be internally provided with cooling water pipe 16, and use refractory concrete to cover, cooling water pipe 16 forms overall water circulation in the front wall 7 and top 8 (part 24 of " stove ") of combustor, it is possible to cool down the concrete at each position of the burner hearth of combustor so that the concrete within the burner hearth of combustor can bear the high temperature of more than 1500 degree。In the present embodiment, the part 13 of cooling water pipe 16 and " pot " below is connected to, the heat that the part 24 of " stove " can be absorbed by cooling water pipe 16 heat exchange of the part 13 of " pot " later, takes full advantage of the heat of cooling water pipe 16 interior-heat water。

Furnace roof 8 is provided with secondary wind air inlet 9, secondary wind air inlet 9 for passing into secondary wind in the burner hearth of combustor, ensure that the water gas (particularly remaining water gas from the unburnt high-temperature flue gas that the primary zone chimney arch 14 detaches) produced fully burns, reach water gas better and namely produce the effect namely fired。

Steam pipe 21 is arranged in the second independent air compartment 22, for supplying saturated vapor to the primary zone of water-cooled grate 19, makes the fuel in fuel bed 12 produce water gas together with saturated vapor under the high temperature conditions。In the present embodiment, the consumption of saturated vapor is measured by steam-flow meter, pushes Synchronization Control with fuel, and the quantity of steam that the boiler of different tonnages needs is different。

Adopting water gas provided by the utility model to produce the boiler burning Integrated Combustion equipment, the thermal efficiency reaches more than 80% (the actual test of boiler is all more than 82%), thus reaching the effect of high efficiency boiler, energy-saving and environmental protection。

Device described in the utility model is not limited to the embodiment described in detailed description of the invention, and those skilled in the art draw other embodiment according to the technical solution of the utility model, also belongs to technological innovation scope of the present utility model。

Claims (7)

1. a water gas produces and burns Integrated Combustion equipment, including being arranged on base, internal burner hearth is provided with the combustor of chimney arch (14), it is arranged in described combustor, the fire grate (19) being provided with primary zone of described chimney arch (14) lower section, it is arranged on the outer feed bin (1) depositing blue carbon (10) being connected with described fire grate (19) one end of described combustor, it is connected to the fuel pusher (4) for above pushing described blue carbon (10) to described fire grate (19) on described feed bin (1), it is arranged on described fire grate (19) lower section, for supplying the some independent air compartment of air to the described combustor on described fire grate (19), it is characterized in that: described independent air compartment is each tightly connected with described fire grate (19), the front wall (7) of described combustor, internal and the described chimney arch (14) of furnace roof (8) is internal is provided with cooling water pipe (16), described fire grate (19) is connected with for supplying the steam pipe (21) generating the saturated vapor needed for water gas to the described primary zone on described fire grate (19)。

2. combustion apparatus as claimed in claim 1, it is characterized in that: described fire grate (19) is fixed water-cooled grate, being divided into preheating zone, primary zone, dregs baking region, lower section is corresponding respectively is tightly connected the first independent air compartment (20) that intake all can individually adjust, the second independent air compartment (22), the 3rd independent air compartment (15)。

3. combustion apparatus as claimed in claim 2, is characterized in that: described steam pipe (21) is arranged in described second independent air compartment (22)。

4. combustion apparatus as claimed in claim 1, is characterized in that:

Described chimney arch (14) covers above described primary zone, the refractory material adopting resistance to 1700 degree of high temperature makes, the burner hearth of described chimney arch (14) one end and described combustor collectively forms arch mouth (11), the area of described arch mouth (11) ensure that the state that combustion space is tiny structure that the primary zone by described fire grate (19) and described chimney arch (14) are constituted, the state of described tiny structure both can guarantee that the temperature that described water gas produces and burning is required can be assembled in the described primary zone of described chimney arch (14) lower section, can guarantee that again the thermal-flame of the described water gas in described primary zone burning generation and high-temperature flue gas (17) flow out in described burner hearth smoothly from described primary zone。

5. combustion apparatus as claimed in claim 1, it is characterized in that: described fuel pusher (4) includes the supporting plate (5) being arranged under described feed bin (1), be arranged on the scraping wings with hydraulic cylinder (3) on described supporting plate (5) (2), connect the Hydraulic Station (6) of described hydraulic cylinder (3)。

6. combustion apparatus as claimed in claim 1, is characterized in that: be provided with inputting the secondary air inlet (9) of secondary wind on described combustor in the described burner hearth of described combustor。

7. combustion apparatus as claimed in claim 6, is characterized in that: described secondary air inlet (9) is arranged on the described furnace roof (8) of described combustor。