CN202733894U

CN202733894U - Semi-premixed natural gas pipe burner

Info

Publication number: CN202733894U
Application number: CN 201220333519
Authority: CN
Inventors: 赵治国; 金晔荻; 严家武
Original assignee: Shanghai Tenneco Exhaust System Co Ltd
Current assignee: Shanghai Tenneco Exhaust System Co Ltd
Priority date: 2012-07-10
Filing date: 2012-07-10
Publication date: 2013-02-13
Anticipated expiration: 2022-07-10

Abstract

The utility model relates to a semi-premixed natural gas pipe burner, which comprises an outer pipe, a secondary mixing chamber, a primary mixing chamber, an air inlet hole plate, a gas inlet pipe and a combustion hole plate, wherein the secondary mixing chamber is coaxially arranged in the outer pipe and is separated from the outer pipe, and the primary mixing chamber is coaxially arranged in the secondary mixing chamber and is separated from the secondary mixing chamber; the air inlet hole plate is connected at the left end of the outer pipe, the secondary mixing chamber and the primary mixing chamber, and the gas inlet pipe is coaxially connected onto the air inlet hole plate and extends into the primary mixing chamber; and the combustion hole plate is connected at the right end of the primary mixing chamber. The semi-premixed natural gas pipe burner has the characteristics that the first air-fuel ratio can be adjusted, the combustion stability under the condition of small flow of natural gas is ensured, and the mixed gas temperature field is uniform.

Description

Half premixed natural gas tubular type burner

Technical field

The utility model relates to a kind of burner, particularly a kind of half premixed natural gas tubular type burner.

Background technology

Often need to adopt firing equipment to obtain needed gas temperature in the engineering production field, neat gas burner is the normal burner types that adopts.By hybrid mode empty, natural gas, neat gas burner can be divided into non-premix, half premix and premix burner.In the industrial application scope, usually can assess with following several indexs the performance of combustion of natural gas:

1, the trouble free service condition range of burner;

Industrial burner requires burner to have the condition range of certain trouble free service, tempering can not occur and take off fiery phenomenon at this scope inner burner.

2, satisfied requirement to the length of flame

According to the needs of applied specific environment, wish that burner has the adjustable performance of the length of flame.To improve the risk of the efficiency of heating surface and reduction hot-spot.

3, the simplification of operation and control

The burner that complicated operation and control strategy are difficult to realize is not suitable for engineering to be used, and under the prerequisite that satisfies the heating properties requirement, burner design simple to operate and that control is easy to realize is applicable to commercial Application.

The utility model content

The purpose of this utility model, but be to provide half premixed natural gas tubular type burner of an a kind of air-fuel ratio self-control, applicable working condition wide ranges.

The purpose of this utility model is achieved in that a kind of half premixed natural gas tubular type burner, and it comprises:

Outer tube;

Secondary hybrid chamber, coaxial setting also and between the outer tube are provided with the interval within the outer tube;

The mixed once chamber, coaxial be arranged in the secondary hybrid chamber and and the secondary hybrid chamber between be provided with the interval;

The air inlet orifice plate is connected to the left end in outer tube, secondary hybrid chamber and mixed once chamber;

Gas inlet pipe coaxially is connected on the air inlet orifice plate and stretches in the mixed once chamber;

The burning porose disc is connected to the right-hand member in mixed once chamber.

Described air inlet orifice plate is provided with primary air import, auxiliary air import and tertiary air import; The primary air import is communicated with the mixed once chamber, and the auxiliary air import is communicated with the secondary hybrid chamber, and the tertiary air import is communicated with the interval between secondary hybrid chamber and the outer tube.

The head of described gas inlet pipe is the taper of convergent, is provided with a plurality of gas outlets at taper surface.

Half premixed natural gas tubular type burner of the present utility model, combustion gas is by several angle ejections of gas pipeline head in the mixed once chamber, mix for the first time with the primary air in entering the chamber, mixed gas again several apertures on the burning porose disc enters the secondary hybrid chamber, lighted the required air of auxiliary air supplemental natural gas completing combustion of inflow in the place ahead, hole through aperture effluent air mixture.Leave the interval between secondary hybrid chamber and the outer tube and lead to tertiary air, the amount of primary air amount, auxiliary air amount and tertiary air can be according under the different air inlet amounts, the back pressure of diverse location realizes that self-control changes, thus the condition range of expansion burner trouble free service.

Half premixed natural gas tubular type burner of the present utility model, it is adjustable to have first air-fuel ratio, guarantees the combustion stability under the natural gas low flow rate condition, the more uniform characteristics in mist temperature field.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the utility model half premixed natural gas tubular type burner;

Fig. 2 is the A-A sectional structure schematic diagram of Fig. 1;

Fig. 3 is the B-B sectional structure schematic diagram of Fig. 1.

The specific embodiment

Referring to Fig. 1, cooperate referring to Fig. 2, Fig. 3, half premixed natural gas tubular type burner of the present utility model comprises outer tube 1, secondary hybrid chamber 2, mixed once chamber 3, air inlet orifice plate 4, gas inlet pipe 5 and burning porose disc 6.Secondary hybrid chamber 2 coaxial being arranged in the outer tube 1 wherein also and between the outer tube are provided with the interval, mixed once chamber 3 is coaxial be arranged in the secondary hybrid chamber 2 and and the secondary hybrid chamber between be provided with the interval, air inlet orifice plate 4 is connected to the left end in outer tube, secondary hybrid chamber and mixed once chamber, gas inlet pipe 5 is coaxial to be connected on the air inlet orifice plate 4 and to stretch in the mixed once chamber 3, and burning porose disc 6 is connected to the right-hand member in mixed once chamber 3.

Air inlet orifice plate 4 in the utility model is provided with primary air import 41, auxiliary air import 42 and tertiary air import 43; Primary air import 41 is communicated with mixed once chamber 3, and auxiliary air import 42 is communicated with secondary hybrid chamber 2, the interval that tertiary air import 43 is communicated with between secondary hybrid chamber and the outer tube.

The head 51 of the gas inlet pipe 5 in the utility model is the taper of convergent, is provided with a plurality of gas outlets 52 at taper surface.

Operation principle of the present utility model is described as follows in conjunction with Fig. 1, Fig. 2, Fig. 3:

Air divides three parts to enter in the burner, wherein primary air enters into mixed once chamber 3 by primary air import 41 along the circular passage around the gas inlet pipe 5, auxiliary air enters secondary hybrid chamber 2 by auxiliary air import 42, and tertiary air mixes with hot flue gas along the place ahead that secondary hybrid chamber and space between the outer tube enter into the combustion chamber by tertiary air import 43.The mass distribution of three strands of air is by the big or small self-control of each several part system back pressure, wherein the pore size between secondary hybrid chamber and the outer tube will be through the Fluid Mechanics Computation numerical computations end value that is optimized, and reaches optimal value to guarantee the mass fraction that primary air accounts for total air.Combustion gas enters into the mixed once chamber by gas pipeline, and the skewed slot outflow by pipe end forms and mixes with the air staggered form, improves the mixed effect of combustion gas and air.Fuel gas mixture after the mixed once is lighted in the exit of burning porose disc 6, and auxiliary air continues to replenish the required air of combustion gas completing combustion, thereby tertiary air mixes the hot gas that forms needed temperature and mass flow with combustion product.

Claims

1. one and half premixed natural gas tubular type burners is characterized in that comprising:

Outer tube;

2. half premixed natural gas tubular type burner according to claim 1, it is characterized in that: described air inlet orifice plate is provided with primary air import, auxiliary air import and tertiary air import; The primary air import is communicated with the mixed once chamber, and the auxiliary air import is communicated with the secondary hybrid chamber, and the tertiary air import is communicated with the interval between secondary hybrid chamber and the outer tube.

3. half premixed natural gas tubular type burner according to claim 1, it is characterized in that: the head of described gas inlet pipe is the taper of convergent, is provided with a plurality of gas outlets at taper surface.