CN2913856Y - Pulverized coal firing boiler horizontal shade minim oil burner - Google Patents

Abstract

The utility model discloses a horizontal micro oil combustor of pulverized coal boiler for igniting dense and dilute pulverized coal/air flows, which is designed to solve the problems of high oil consumption and high cost in starting ignition of pulverized coal boiler, and capable of reducing oil consumption by 95%. During normal operation of boiler, the combustor can also realize classified combustion of pulverized coal to reduce discharge amount of nitrogen oxides by 25-30%. The micro oil combustor has an air inlet pipe, an impact block having trapezoid cross section and installed on the front part of the air inlet pipe, and a small combustion chamber arranged behind the impact block. Fuel oil atomized by an atomizing oil gun is combusted to ignite dense pulverized coal/air flow in the small combustion chamber, and further ignite dilute pulverized coal/air flow. A middle pipe with diameter slightly larger than that of the air inlet pipe and an outer pipe with larger diameter are arranged behind the small combustion chamber. The outer pipe is hermetically connected with the air inlet pipe in the middle part of the combustor, and connected with a film air pipe. The film air cools walls of the air inlet pipe, middle pipe and outer pipe at combustion section, and simultaneously supplies oxygen gas for combustion.

Description

Pulverized-coal fired boiler horizontal bias micro oil burner

One, technical field: the utility model relates to a kind of assisted combustion device of boiler, especially the burner of pulverized-coal fired boiler starting ignition.

Two, background technology: pulverized-coal fired boiler is that coal is made coal dust in coal pulverizer, with high velocity air coal dust is sprayed into burner hearth then, is a kind of boiler of suspended state burning.Pulverized-coal fired boiler start-up course diesel oil combustion-assistant ignition.The coal-powder boiler of a 670t/h starts a fuel consumption 60-70 ton, drops to 60% when following at boiler load, also will use diesel oil combustion-supporting, to stablize furnace flame.The power plant of a 500MW, about more than 2000 tons of the annual fuel consumption of its boiler, therefore, fuel consume has accounted for the critical positions of power plant cost.The Heilungkiang DianKeYuan has been developed vaporization small oil gun firing technique, and envoy's oil level improves greatly.It is to establish a taper combustion chamber in burner breeze airflow admission line central authorities, introduce the oil gun fuel injection nozzle from the tube chamber outside, fuel injection nozzle changes into thin pearl with fuel spray and is lighted by electric igniter, taper combustion chamber interior breeze airflow again ignites, flame is lighted the pulverized coal flow that flows through from the taper combustion chamber outside after mouthful ejection of taper combustion chamber awl, pulverized coal flow enters burner hearth and fully burns then.This burner remains in some shortcomings, and the gas-flow resistance in admission line of taper combustion chamber is big, quick abrasion under the high speed breeze airflow impacts.Change and to shut down, influence boiler and normally move.

Three, summary of the invention: the purpose of this utility model is a kind of pulverized-coal fired boiler horizontal bias micro oil burner of design, has overcome the problem that above-mentioned prior art exists, and better result of use is arranged.Its technical scheme is: impact block is equipped with in the front portion in the burner breeze airflow admission line that level is installed, and it is trapezoidal cross-section, installs and fixes from the admission line outside.Impact block after a while opposite, position one side be provided with little combustion chamber, on the little combustion chamber sidewall vaporization oil gun is installed, the oil inlet pipe of oil gun turns back on the oil gun fuel injection nozzle after through oil gun flame district.At burner outlet, there are middle pipe and the bore bigger outer tube more bigger than combustor air inlet pipe diameter in little combustion chamber back, and they coexist on the center line.Outer tube is connected sealing at the burner middle part with admission line, and joins with the air film airduct.

The good life-span of impact block result of use that pulverized-coal fired boiler horizontal bias micro oil burner adopts is long, changes easily, need not shut down.The vaporization oil atomizer gun that adopts makes fuel gasification, and fuel consumption descends 95%.Adopt the air film cooling technology to make the burner tube wall temperature can be not too high, increase the service life.Light side breeze airflow is in water screen tube one side in burner hearth, and this zone becomes the hyperoxia district, can effectively prevent the water screen tube slagging scorification.Breeze airflow is carried out fractional combustion in boiler when boiler normally moves, and can reduce boiler nitrogen oxide emission 25-30%.

Four, description of drawings: Fig. 1 is the structural representation that pulverized-coal fired boiler horizontal bias micro oil burner is overlooked section.

Five, the specific embodiment: pulverized-coal fired boiler horizontal bias micro oil burner is installed in four jiaos in boiler next time on the wind blast pipe, and its structure as shown in drawings.A wind that carries coal dust is entered by the breeze airflow admission line (2) of burner, side in admission line has impact block (1), on the position, opposite the little combustion chamber of tubular (10) is being housed behind the impact block pin of admission line middle part, it is offset in the admission line (2), its front end towards the air inlet inlet is cut into tilt port, and tilt port is towards impact block (1).The parallel streamline of breeze airflow runs into impact block in admission line stops and can formation cave in, and recovers parallel later again.And the most of coal dust in the air-flow flows to the little combustion chamber (10) on opposite under the inertia force effect, thus the thick coal culm air-flow and the thin powdered coal air-flow that form.Impact block in the admission line (1) section is trapezoidal, puts on the pipe tap position from admission line (2) outside and uses bolting.Not only result of use is good for it, and because of its gauge is big, the cycle of resistance to wearing is long, can change at any time again, and is very convenient.High velocity air in the pipeline forms and does not have the breeze airflow effusion when negative pressure is changed impact block.This is first characteristics of the present utility model.

Vaporization oil gun (3) is housed on the sidewall of combustion chamber (10), is used for lighting the interior thick coal culm air-flow of combustion chamber of flowing through.And breeze airflow thickens in the combustion chamber, can effectively reduce ignition temperature.Oil inlet pipe (5) is connected on the oil gun atomizer (6) through the flame district of oil gun, and fuel oil heats up through the flame district, has gasified when atomizer sprays again, makes oil inflame very abundant, the ignition temperature height.Fuel-economizing simultaneously is more obvious, and per hour oil consumption drops to the 20-25 kilogram by 1000 kilograms, and the low-load combustion-stabilizing rate of economizing gasoline descends 65%, and this is second characteristic of the present utility model.At this moment burner can be regarded as a kind of oil-saving burner.Compressed air is blown into from the blast pipe (4) of vaporization oil gun, supplies with the oxygen of burning usefulness, guarantees vaporization oil gun operate as normal.At the burner rear portion, be equipped with than the bigger middle pipe (9) of combustor air inlet pipeline (2) bore with mouthful through bigger outer tube (8) back of combustion chamber (10), and outer tube (8) is connected sealing at the burner middle part with admission line (2), and joins with air film airduct (11).The thermal-flame of vaporization oil gun is lighted the thick coal culm air-flow that the interior B of the little combustion chamber of tubular (10) district is flow through, and can check combustion case by peep hole (7).The thick coal culm air-flow that ignites and cross from the combustion chamber circumferential flux at combustion chamber outlet burned flame, to interior the C of middle pipe (9) district, flame ignites and reaches the thin powdered coal air-flow of periphery below the admission line (2).The breeze airflow that ignites fully enters the burner hearth of boiler by the D district of outer tube (8).This combustion process is that classification is carried out.After lighting, boiler enters normal operating condition, the vaporization oil gun quits work, at this moment the effect of burner is: breeze airflow is divided into deep or light two kinds sprays in the burner hearth, there is identical drift angle at the relative burner hearth of the burner center that is installed in four jiaos in burner hearth, the thick coal culm air-flow that sprays into is near the burner hearth center, and at burner hearth center formation eddy flow, thick coal culm rises on being ignited while burning by burner hearth high temperature earlier; The thin powdered coal air-flow is lighted after a while in the thick coal culm air-flow outside.Fractional combustion in this burner hearth that forms under the burner effect can reduce the discharging of nitrogen oxide, and discharged nitrous oxides reduces 25-30% after tested.This is the 3rd characteristics of the present utility model, and burner at this moment can be regarded a kind of shade burner as again.In the burner operation process, be blown into high pressure draught from air film airduct (11), air communication is crossed the outer wall of admission line (2) rear end, by the inside and outside wall of middle pipe (9), by the inwall of outer tube (8).It provides oxygen to make it sufficient combustion for the pulverized coal flow of burning on the one hand, is each tube wall cooling of burning block on the other hand, forms the air film protection, makes the pipeline longer service life of high temperature combustion zone, and this is the 4th characteristics of the present utility model.

Claims (4)

1, pulverized-coal fired boiler horizontal bias micro oil burner is the little combustion chamber of installing, vaporization oil gun and an impact block in horizontal firing device breeze airflow admission line, it is characterized in that: impact block (1) is equipped with in the front portion in the burner breeze airflow admission line (2) that level is installed, admission line middle part impact block after a while opposite, position one side be provided with little combustion chamber (10), vaporization oil gun (3) is installed on the little combustion chamber sidewall, and the oil inlet pipe of oil gun (5) process oil gun flame turns back to oil gun atomizer (6) behind the district; At burner outlet, there are middle pipe (9) and the bore bigger outer tube (8) more bigger than combustor air inlet pipeline (2) bore in the back of little combustion chamber (10), and outer tube (8) is connected sealing at the burner middle part with admission line (2), and joins with air film airduct (11).

2, pulverized-coal fired boiler horizontal bias micro oil burner as claimed in claim 1, it is characterized in that: described impact block (1) section is trapezoidal, puts on the pipe tap position from admission line (2) outside and uses bolting.

3, pulverized-coal fired boiler horizontal bias micro oil burner as claimed in claim 1, it is characterized in that: middle pipe (9) that described burner is not held and outer tube (8) and admission line (2) are on same axial line, middle pipe is comprised in the outer lumen, does not hold with admission line and joins.

4, pulverized-coal fired boiler horizontal bias micro oil burner as claimed in claim 1, it is characterized in that: little combustion chamber (10) is offset in the combustor air inlet pipeline (2), and its front end towards the air inlet inlet is cut into tilt port, and tilt port is towards impact block (1).

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