CN202371750U

CN202371750U - Pure oxygen ignition device for boiler in power station

Info

Publication number: CN202371750U
Application number: CN201120507609XU
Authority: CN
Inventors: 段君寨; 郭秀峰; 刘明杰; 熊卓远; 胡伟; 侯德安; 姚文达; 张文鹏; 李福祥; 张海; 孔凡平; 姜东桥; 冯霖; 刘晓波; 张立群; 郑小明; 闫中前; 闫高程; 辛志刚
Original assignee: Hua Electricity Zhangqiu Electricity Generating Corp Ltd; WEIFANG POWER GENERATION CO Ltd OF CHINA HUADIAN Corp; Aipeix Sci & Tech (beijing) Co Ltd
Current assignee: Hua Electricity Zhangqiu Electricity Generating Corp Ltd; WEIFANG POWER GENERATION CO Ltd OF CHINA HUADIAN Corp; Aipeix Sci & Tech (beijing) Co Ltd
Priority date: 2011-12-08
Filing date: 2011-12-08
Publication date: 2012-08-08
Anticipated expiration: 2021-12-08

Abstract

The utility model discloses a pure oxygen ignition device for a power station boiler, which comprises a cylindrical shell, in which a multi-stage combustion chamber, a micro-oil gun, a blunt body and an oxygen supply structure are arranged. The flame outlet from the powder inlet to its rear end is arranged in sequence, wherein the micro-oil gun is arranged in the first-stage combustion chamber near the inlet end of the coal powder; the blunt body is arranged at the flame outlet on the housing; the oxygen supply structure It is arranged on the side of the blunt body or through the blunt body, and the oxygen ejected from it is sprayed into the recirculation zone formed in the space behind the blunt body. The utility model sprays a small amount of pure oxygen into the backflow area of the rear end of the blunt body arranged at the outlet of the pulverized coal burner, so that the backflow area is in an oxygen-enriched combustion-supporting state, and the temperature of the backflow area is increased, which is beneficial to flame propagation, flame stability and The pulverized coal is fully burned to reduce the carbon content of fly ash in the airflow after ignition. And it only needs to set a micro-oil gun at the inlet end of the pulverized coal burner, which produces a good fuel-saving effect.

Description

Station boiler pure oxygen ignition device

Technical field

The utility model relates to the device of a kind of starting ignition and low-load combustion-stabilizing, refers to a kind of station boiler pure oxygen ignition device especially.

Background technology

According to statistics, occupy the second place of the world to whole nation generating equipment installation in the end of the year 2010 total capacity, wherein thermoelectricity accounts for more than 70% of total capacity of installation.The start and stop of thermal power generation unit and low-load combustion-stabilizing need consume a large amount of petroleum resources; International oil price causes fuel price to continue to rise to the impact of domestic market; China is not produce oil big country, but is the oily rich and influential family of consumption, and the fuel-economizing work in the energy savings just has very important Special Significance.Fuel-economizing work is as the important component part of energy conservation; Should strengthen the fuel-economizing management from overall processes such as power plant's design, lectotype selection, construction, maintenance and operations; And, reliably igniting ripe according to the actual conditions active adoption and stable combustion technology transform boiler, reduces thermal power generation station-service oil significantly.Therefore, station boiler pure oxygen ignition technology has broad prospect of application.

The utility model content

To the needs of existing station boiler firing technique, the purpose of the utility model is to provide a kind of rate of economizing gasoline higher, the pure oxygen ignition device of safer reliable igniting and steady combustion.

For realizing above-mentioned purpose; The station boiler pure oxygen ignition device of the utility model; Comprise tubular shell, be provided with composite chamber, little oil gun, bluff body and oxygen supply structure in the housing, the flame ejiction opening of composite chamber from the coal dust import of housing front end to its rear end is arranged in order; Wherein, little oil gun is arranged in the one-level combustion chamber near the coal dust entrance point; Said bluff body is arranged on the flame ejiction opening place on the said housing; Said oxygen supply structure is arranged on bluff body one side or passes the bluff body setting, and the oxygen of its ejection is sprayed in the recirculating zone that forms in the bluff body rear space.

Further, said bluff body is a pyramid or cone, and cone is along the axis setting of said housing flame ejiction opening, and the awl point points to the housing front end, and the cone rear end has the plane that the air-flow that can make ejection in the housing forms the recirculating zone.

Further, said bluff body is three tapered ribs of a section, and this bluff body is along the radially setting of said housing flame ejiction opening, and the awl point points to the housing front end, and the rear end is the plane.

Further, said oxygen supply structure is an annular, and it circumferentially is provided with a plurality of oxygen jets or spray orifice.

Further, also be provided with the Pulverized Coal Concentration ring on the madial wall of the coal dust import department on the said housing.

Further, said outside also is coated with the surrounding air coolant jacket, and this coolant jacket is provided with air inlet, and the corresponding end of flame ejiction opening is provided with exhaust outlet on coolant jacket and the housing, and cooling air is admitted in the boiler furnace as the new wind of secondary simultaneously.

Further, said one-level combustion chamber is the central burner pipe, and the central burner pipe is arranged on the central axis place in the said housing.

The utility model sprays into a small amount of pure oxygen in the recirculating zone through the bluff body rear end that is provided with at coal burner ejiction opening place; Make the recirculating zone be in the oxygen-enriched combustion-supporting state; Improved the recirculating zone temperature; Help flame propagation, flame stabilization and coal dust and fully burn, reduce the unburned carbon in flue dust in the air-flow of igniting back.And only need a little oil gun be set and get final product, produce good oil-saving effect at the entrance point of coal burner.

Description of drawings

Fig. 1 is the structural representation of the pure oxygen ignition device of the utility model;

Fig. 2 is the sketch map of the another kind of form of pure oxygen ignition device of the utility model;

Fig. 3 is the recirculating zone sketch map that the pure oxygen ignition device exit of the utility model forms.

The specific embodiment

As shown in Figure 1; The pure oxygen ignition device of the utility model comprises that Pulverized Coal Concentration ring 1, coal burner 2, central burner pipe 3 (one-level combustion chamber), oil gun sleeve pipe 4, section are leg-of-mutton strip bluff body 5, annular oxygen jet 6 and surrounding air coolant jacket 7; Central burner pipe 3 is positioned on coal burner 2 axis; In order to improve its high-temperature resistance of little oil gun; Little oil gun (not shown) is inserted in the central burner pipe 3 from oil gun sleeve pipe 4, and oil gun sleeve pipe 4 connects with central burner pipe 3, and annular oxygen jet 6 is arranged on a side of coal burner 2 flame ejiction opening place bluff bodies 5; Surrounding air coolant jacket 7 is sleeved on coal burner 2 outsides, utilizes from the new wind of its air inlet input coal burner 2 housings are cooled off.

In the course of work, after breeze airflow encircled through Pulverized Coal Concentration 1, forming core was the thick coal culm air-flow, and part is the thin powdered coal air-flow all around.The thick coal culm air-flow passes through in central burner pipe 3 inside, and the thin powdered coal air-flow passes through in central burner pipe 3 outsides.Oily flame in the oil gun sleeve pipe 4 is lighted the thick coal culm air-flow in central burner pipe 3 inside, in central burner pipe 3 inside, behind little oil gun flame ignition breeze airflow, relies on the 3 steady combustions of central burner pipe.The flame of central burner pipe 3 mixes with the thin powdered coal air-flow in outlet, makes the thin powdered coal air-flow participate in burning.Central burner pipe 3 is exported between burner 2 outlets and is the secondary pulverized coal combustor.Coal burner 2 exits, breeze airflow is walked around bluff body 5, forms the stable centers recirculating zone in bluff body 5 backs, and concentration is that 95% above pure oxygen sprays from ring-type oxygen jet 6, forms local oxygen enrichment zone in the recirculating zone, center, carries out oxygen-enriched combustion-supporting.Oxygen-enriched combustion-supporting strengthens the burning velocity of regional area fuel, improves the regional area ignition temperature, helps lighting back flame propagation.

As shown in Figure 3, coal burner 2 exits, breeze airflow is walked around bluff body 5, forms the stable centers recirculating zone in bluff body 5 backs.Carry out oxygen-enriched combustion-supporting in the recirculating zone, center that behind bluff body, forms; Forming recirculating zone, high temperature center, because the recirculating zone, center is thermograde in the breeze airflow, concentration gradient maximum region, also is that breeze airflow and pure oxygen mix the most powerful zone; Can utilize strong heat and mass effect is arranged between recirculating zone, high temperature center and the breeze airflow; Firing coal-dust airflow reaches reliable ignition breeze airflow and sufficient combustion thus once more, reduces the purpose of the unburned carbon in flue dust in the air-flow of igniting back.Help flame propagation and flame stabilization.

Bluff body 5 in the above-mentioned embodiment is leg-of-mutton list structure for section, and in addition, bluff body 5 also can adopt taper shape or pyramid-shaped structures, just will bore point and get final product towards coal burner 2 front end coal dust input ports and along the burner axis setting.The annular oxygen jet also can as shown in Figure 2ly pass bluff body 5 and be provided with, and only aerobic gas can spray into the recirculating zone, center and get final product.In order to guarantee to spray into the even of oxygen, annular oxygen jet can upwards be provided with a plurality of spray orifices or nozzle in its week.In addition, central burner pipe 3 rear portions also can be provided with a plurality of combustion chambers as required.

It is to be noted that the foregoing description is exemplary the utility model is explained,, all should not think the protection domain that breaks away from the utility model according to any distortion that the spirit of the utility model is made.

Claims

1. The pure oxygen ignition device for power station boilers is characterized in that it includes a cylindrical shell in which there are multi-stage combustion chambers, micro-oil guns, blunt bodies and oxygen supply structures. The flame ejection ports imported to its rear end are arranged in sequence, wherein the micro-oil gun is arranged in the primary combustion chamber near the coal powder inlet; the blunt body is arranged at the flame ejection ports on the housing; the oxygen supply The structure is arranged on one side of the blunt body or through the blunt body, and the oxygen ejected from it is sprayed into the recirculation zone formed in the space behind the blunt body.

2. The pure oxygen ignition device for utility boilers as claimed in claim 1, wherein the blunt body is a pyramid or a cone, the cone is arranged along the axis of the flame outlet of the housing, and the tip of the cone points to the shell The front end of the body, and the rear end of the cone have a plane that can make the airflow ejected from the shell form a recirculation zone.

3. The pure oxygen ignition device for power plant boilers according to claim 1, wherein the blunt body is a triangular strip with a conical cross section, and the blunt body is arranged radially along the flame ejection port of the housing , the tip of the cone points to the front end of the shell, and the rear end is a plane.

4. The pure oxygen ignition device for power plant boilers according to claim 1, wherein the oxygen supply structure is ring-shaped, and a plurality of oxygen nozzles or injection holes are arranged on its circumference.

5 . The pure oxygen ignition device for power plant boilers according to claim 1 , wherein a pulverized coal concentration ring is also provided on the inner side wall of the pulverized coal inlet of the casing. 6 .

6. The pure oxygen ignition device for power plant boilers according to claim 1, characterized in that, the outside of the housing is also covered with a peripheral wind cooling jacket, the cooling jacket is provided with an air inlet, and the cooling jacket and the housing are sprayed with flames. The corresponding end of the outlet is provided with an exhaust port, so that the cooling air is sent into the boiler furnace as the secondary fresh air at the same time.

7. The pure oxygen ignition device for power plant boilers according to claim 1, wherein the primary combustion chamber is a central combustion tube, and the central combustion tube is arranged at the central axis of the housing.