CN2037425U

CN2037425U - Low nox energy-saving burning equipment

Info

Publication number: CN2037425U
Application number: CN 88214087
Authority: CN
Inventors: 焦桂华; 王天飞; 傅忠诚
Original assignee: NORTHWEST BUILDING ENGINEERING COLLEGE; BEIJING PUBLIC UTILITY RESEARCH INSTITUTE
Current assignee: NORTHWEST BUILDING ENGINEERING COLLEGE; BEIJING PUBLIC UTILITY RESEARCH INSTITUTE
Priority date: 1988-09-24
Filing date: 1988-09-24
Publication date: 1989-05-10

Abstract

The utility model discloses an energy-saving fuel gas combustion device with low no-[x] discharge. The utility model is characterized in that the device adopts a combustion system which is provided with excess air injection, two-stage fuel gas combustion and plane segmentation flame, and the device is also provided with a small chamber type high temperature heating furnace which fits the combustion system. Compared with the existing combustion devices, the no-[x] pollutant discharge amount of the utility model reduces by more than 50%. Furthermore, the device also has the advantages of fuel gas saving and complete combustion.

Description

Low NOx energy-saving burning equipment

The utility model belongs to a kind of fuel gas buring equipment of hot industry heating usefulness, and particularly the steady flame device of flame is cut apart on excessive injection air fuel gas two stage combustion wherein and plane.

The medium and small combustion gas smith's hearth thermal efficiency that uses is low at present, nitrogen oxide (NO in the burning back discharging flue gas _X) height.Both wasted energy, again pollutant atmosphere.

The purpose of this utility model is to release a kind of low NO to the public _XThe heating furnace of the burner of pollution, saving combustion gas and supporting with it function admirable.In order to reduce NO _XPollutant emission also improves the thermal efficiency.

For achieving the above object, the utility model is finished in the following ways.

1, adopted the low NO of injection excess air combustion gas two stage combustion _XCombustion system.Whole combustion gas of whole combustion system distribute by a certain percentage and infeed for twice.A combustion gas is by the negative inspiratory pressure high-pressure ejector, and injection is gone into the required whole combustion airs of combustion process, forms the premixed combustible gas of excess air, forms thin circular flat at primary combustion device head and cuts apart flame.The secondary combustion gas is by being arranged in the secondary gas nozzle of primary combustion zone periphery.Be divided into the multiply thread and spray in the high-temperature flue gas, be the diffusion flame of brightness flame shape by superfluous oxygen formation, and then finish the burning overall process.

2, adopt the burner head form of porous radial spray, its design form makes the uniformity of exit velocity improve except guaranteeing certain exit velocity especially, can prevent tempering effectively.This head has the less resistance loss simultaneously, can guarantee that mass ratio of induced-to-inducing air reaches design load.

3, be provided with burner block with steady flame thing, it can control flame profile, promotes to mix.Can also play the effect of radiation heat transfer in anti-anti-avulsion fire and the reinforcement stove.

4, adopted the chamber structure of full refractory fibre furnace lining and the hard furnace bottom of refractory brick.Both can satisfy heating process requirement, conserve energy again.The body of heater load-bearing is a steel construction, adds the furnace retaining steel plate, has the advantages that air-tightness is good and construction is easy to maintenance.

Fig. 1 is the front view of burner.Among the figure: (1) primary combustion device, (2) secondary burner, (3) burner block, (4) primary combustion device head, (5) secondary gas nozzle.

Fig. 2 is the vertical view of burner.Among the figure: (6) gas nozzles, (7) injector, (8) secondary gas distribution pipe.

Fig. 3, Fig. 4 are respectively the front view and the vertical view of burner block.Among the figure: (9) fuel gas mixture inlets, (10) secondary gas nozzle hole, (11) steady flame thing.

Fig. 5, Fig. 6 are respectively the front view and the vertical view of primary combustion device head.Among the figure: (12) are head convergent lengthening spout.

Fig. 7, Fig. 8 are respectively once the spout partial enlarged drawing with secondary burner.Among the figure: (13) heat-insulating material, (14) secondary combustion gas spout.

Fig. 9, Figure 10 are respectively the front view and the vertical views of example structure.Among the figure: comprise the burner of forming by primary combustion device (1) secondary burner (2) and burner block (3) (15); The body of heater of forming by refractory fibre thermal insulating warm-keeping layer (16), the hard furnace bottom of refractory brick (17), grate steel construction (20) and fire door (21) (23); And the smoke evacuation system of forming by exhaust opening (18), flue (19) and chimney (22) (24).

Embodiment: at the small-sized forger heating furnace that uses coke-stove gas of Beijing Public Affair Science Inst.'s exploitation.Burner is located at furnace roof.Furnace height is 460 millimeters, and hearth area is 812 * 580 millimeters.Adopt down smoke-discharging, exhaust opening (18) is distributed in four jiaos of furnace bottoms.Heat insulation of furnace body heat-insulation layer (16) is an aluminosilicate refractory fiber, is fixed on the steel plate of furnace wall with the heat resisting steel clamping plate.Burner tip is by the heat resisting steel manufacturing, and adopts adiabatic measure.Primary combustion device (1) head fire hole form is convergent, elongated spout.The fire hole of secondary burner (2) is 8 groups 16 radially spray orifices.When getting total excess air coefficient α=1.10, the primary combustion air coefficient is more than 1.30, and the ratio (Vg2/Vg) that the secondary combustion gas accounts for total gas quantity is more than 15%.

When adopting coke-stove gas to make fuel, when thermic load be 185,000,000 Jiao/hour, furnace temperature is greater than 1100 ℃, α=1.10, α ₁=1.33, during Vg2/Vg=18%, at the sampling of chimney porch, NO _XBe 54PPM (O ₂: 0%).Compare with original updraft injecting combustor, reduce by 51.8%, and burning fully, the CO discharge capacity is 39PPM (O ₂: 0%).

Adopt plane burning top heating and refractory fibre as heat-insulation material.Stove heats up rapidly, and accumulation of heat is few, high insulating effect.Compare with the brick stove that original size of burner hearth is approximate, gas consumption is by average 29.4Nm ³/ h drops to 15.6Nm ³Below/the h.Save combustion gas more than 47%.Be warming up to 1200 ℃ in the stove and only need about 1.5 hours.

This shows, the utlity model has low NO_XDischarging and fuel-saving remarkable result, and overcome usually low NO_XThe imperfect combustion product that burner is prone to increases, the shortcoming that the thermal efficiency descends.

Claims

1, a kind of low NO _xThe combustion apparatus of discharging and saving gas energy.It comprises burner, body of heater and smoke evacuation system.It is characterized in that being provided with injection excess air, combustion gas two stage combustion and plane and cut apart the flame burning device.

2, press claim 1 described burner, it is characterized in that radially spray orifice of many groups secondary fuel that primary combustion device head adopted convergent, extended type radial spray fire hole and be arranged in the primary combustion zone periphery.

3, press claim 1 described burner, it is characterized in that being provided with the burner block of the steady flame thing of shunting.