CN201285042Y - Airflow annular alternating flow-equalizing injection premixed flame-stabilizing combustor - Google Patents

Abstract

The utility model relates to a premixed combustor with staggered ring-shaped airflow, flow equalization jet and stable flame, which can effectively solve the problems that coal gas and the air are not mixed well, airflow is not in even distribution and the combustion is insufficient or unstable. The combustor has a structure that a cylinder consists of an outer wall and an inner wall moving up and down, wherein the outer wall is arranged on a supporting ring plate; the inner wall and the outer wall are in labyrinth seal connection; a ring-shaped rectangular ring track arranged in the outer wall is symmetrically divided into an upper chamber coal gas distribution ring track and a lower chamber air distribution ring track by an inclined separation wall; the outer end of the largest section of each distribution ring track is respectively connected with a coal gas inlet pipe and an air inlet pipe; and two nozzles are provided with communicated ring-shaped premixed conduits on which equal flow and choked flow link stoppers are arranged. The utility model realizes the jetting and mixing of coal gas and air, reversed flow preheating and stable combustion and has huge economic and societal benefits.

Description

The burner of the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular

One, technical field

The utility model relates to the fuel combustion of Thermal Power Engineering Field and the dedicated devices of flowing heat transfer, the burner of the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular, it can be used for blast funnace hot blast stove as ceramic burner, also can be as a kind of burner application on the industrial furnace of other industry heating.

Two, background technology

(the perhaps indispensable core apparatus of burner material combustion furnace kiln plant, whether good its performance and structure be directly has influence on fuel availability, the thermal efficiency of stove and whether satisfies energy conservation and environment protection burner.At present, widely used various burners do not have the powdered coal burner of burning solid powder, high pressure or the diffusion combustion of low-pressure nozzle burner and burning gases or the burner of premix (half premix) burning of combustion of liquid fuel outward.Various burners all have significant progress and innovation at different industry fields, its effect separately of performance in various fuel-fired furnaces.Finished from sleeve type burner for the burner that adopts diffusion combustion mode, progressively carry out the transition to the conversion of the rectangle burner of comb shape air nozzle, and develop into that the annular steady flame combustion technology of multiple nozzle spraying eddy flow mixing backflow preheat or annular multiinjector are staggered goes up the steady flame overheavy firing of air-flow turn-back pre-heating technology after the spray premixed combustion.Along with the development of combustion technology, the combustion intensity of low-heat value gas and the stability of flame are all greatly improved, coal gas and air preheat make that ignition temperature constantly increases, efficiency of combustion also progressively improves in the cooperation.But make a general survey of existing gas burner, especially use the burner of the blast furnace gas on hot-blast stove, owing to structure unreasonable cause coal gas to mix not good with air and (or) the air-flow skewness is that problems such as thing, incomplete combustion that causes therefrom or combustion instability, heat load adjustment poor performance usually take place.Also there is problem on the structure if add in burner and heat transfer-regenerative apparatus overall co-ordination, will causes hot-blast stove heat-transfer effect difference and the low phenomenon of heat storage utilization rate.Such hot-blast stove obviously can not satisfy blast furnace to the air quantity of hot blast and the requirement of wind-warm syndrome, let alone efficient, the energy-conservation and environmental protection of hot-blast stove, does not also accomplish the operation with security and stability under the high hot blast temperature.Therefore, improve the structure of burner, make its with heat transfer-regenerative apparatus between form and dispose the effective way that just becomes raising hot-blast stove performance rightly.

Three, utility model content

Based on above-mentioned situation, for overcoming the prior art defective, the purpose of the utility model is exactly to propose the burner that the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular, can effectively solve coal gas mixes not good with air, air-flow skewness and incomplete combustion or problem of unstable, the technical scheme of its solution is, include cylinder 8, coal gas distributes circuit 2a and air to distribute circuit 2b, cylinder 8 is made of exterior wall 1 and the interior wall 11 that moves up and down, exterior wall places on the supporting ring flat-plate 9, interior wall adopts labyrinth sealing to be connected 10 with exterior wall and links together, being provided with coaxial cross section in cylinder 8 exterior walls 1 is the ring-type rectangle circuit of rectangle, by inclination partition wall 2C the circuit symmetry is divided into two chambers up and down in the rectangle circuit, upper chamber is that coal gas distributes circuit 2a, lower chambers is that air distributes circuit 2b, two circuits all are the chamber circuit that progressively shrinks inside gas outlet, there are gas inlet pipe 6 and air intlet pipe 7 to insert respectively in the outer end, place, maximum cross-section of distributing circuit separately, distribute the upper inner of circuit and air to distribute the lower inside of circuit to draw jet for gas pipe 3a and the air nozzle pipe 3b that is interspersed along circumferential ring-type respectively at coal gas, two blast tubes are in the cylinder body wall and parallel with its axis, and number respectively is 20～40; Two kinds of blast tubes are drawn by the upper surface respectively in cylinder, form the jet for gas and the air nozzle of ring-type interlaced arrangement, two kinds have above the nozzle be connected by interior wall and exterior wall top between the coaxial annular premixed conduit 4 that constitutes, be equipped with the current-sharing that the faces nozzle-choked flow link stopper 5 of equilateral triangle on the annular premixed conduit 4.

When using said burner, coal gas and air enter separately distribution of air flow circuit from its inlet respectively, afterwards via separately blast tube enter annular premixed groove, enter the combustion space through current-sharing-choked flow link stopper and fire burns after this does preliminary mixing, burning back flue gas has two kinds of types of flow according to different chamber structures; If a. flow through, then, vault flows out the heat-exchange device (or regenerator) below entering from the central space of annular burner downward (relatively upwards) because of stopping to turn back through vault combustion chamber (being used for hot-blast stove); Can form a backflow vortex between mixed airflow that in this process, rises and the flue gas of the decline stream, down current under its effect can to around separately form and be similar to VELOCITY DISTRIBUTION mobile in the pipe and enter heat-exchange device, the high temperature reflux flue gas also can make the rising mixed airflow obtain preheating and the realization flame stabilization that catches fire in advance; The annular burner middle part sealing (being used for other industrial furnace) if b. directly enter the combustion chamber, then the burner middle part also can form the backflow vortex, its high-temperature flue gas can reach the preheating premixed flow and realize the purpose of flame stabilization, but the distribution of air-flow must be through just being evenly distributed behind the current equalizer; In addition, the progressively contraction of coal gas and air distribution channel can make the blast tube exit velocity be tending towards evenly, adds the effect of current-sharing-choked flow link stopper and makes and enter the combustion chamber air-flow more evenly and good mixing.Here it is, and this burner can form high-intensity combustion and the two mechanism of action uniformly of even velocity temperature.

In a word, this burner can realize smoothly that coal gas and air spray premix, backflow preheat, smooth combustion, mixes not good, air-flow skewness, low-heat value gas combustion instability, low, the not high key issue of ignition temperature of combustion intensity with air thereby efficiently solve coal gas.

Four, description of drawings

Fig. 1 is the whole sectional front view of the utility model burner.

Fig. 2 is the utility model burner vertical view.

Fig. 3 is the different a of the utility model burner, b flow field schematic diagram (wherein 12 are regenerator, and 13 are the backflow flow field, and 14 is furnace cavity).

Five, the specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is explained in detail.

By Fig. 1, Fig. 2 provides, the utility model in the specific implementation, the cylinder of burner is built into cylindrical shape by laying bricks or stones by refractory brick or heat-resisting cast iron, cylinder 8 is made of exterior wall 1 and the interior wall 11 that moves up and down, exterior wall places on the supporting ring flat-plate 9, interior wall adopts labyrinth sealing to be connected 10 with exterior wall and links together, constitute stable body structure, build the distribution rectangle circuit of the square-section of coal gas and air in it by laying bricks or stones, the rectangle circuit by inclination partition wall 2c every being set to two chambers (claiming cavity again), upper chamber is that coal gas distributes circuit 2a, draw along circumferential equally distributed jet for gas pipe 3a on its top, after drawing, upwards arrives at this pipe the ejiction opening of annular premixed conduit 4 bottoms, lower chambers is that air distributes circuit 2b, draw along circumferentially being evenly distributed with air nozzle pipe 3b its underpart, and this pipe is drawn the ejiction opening that annular premixed conduit 4 bottoms are upwards also arrived in the back; The ejiction opening of coal gas and air is the staggered ring-type that is arranged in; Annular premixed conduit 4 is built by laying bricks or stones by refractory material and is formed, and its bottom and blast tube communicate, and the current-sharing-choked flow link stopper 5 of triangular-section is then laid on top directly over nozzle exit; Coal gas and air distribution circuit (2a and 2b) separately is the structure that the distribution circuit of whole square-section is split to form by the inclination partition wall 2c that builds by laying bricks or stones by certain slope, they are progressively inside chambers of shrinking of gas outlet of symmetry, insert gas inlet pipe 6 and air intlet pipe 7 respectively in outer end, place, maximum cross-section separately.

Here be necessary to point out that the number of coal gas, air nozzle pipe (3a, 3b) is decided according to the thermic load size of burner and the diameter of burner, generally between 20～40 of each leisures; Coal gas, air nozzle pipe are that the bottom from annular premixed conduit 4 enters, and be different with the position of coal gas, air nozzle pipe by annular premixed conduit 4, and it enters angle and can be in relative axis changes in 0 °～30 ° the angular range; The angle of inclination of the hypotenuse of trapezoid cross section of corresponding annular premixed conduit 4 also has 0 °～30 ° angle to change scope; Number 〉=jet for gas the pipe and the air nozzle pipe number of current-sharing-choked flow link stopper 5 that install on annular premixed conduit 4 tops, generally should be corresponding one by one, can be that the triangular-section also can be other shapes, its objective is the current-sharing effect of playing grid and the steady flame effect that refluxes dorsad, but its size just can not be too little in the time of on being applied to hot-blast stove, and its size just can be little when being used on the industrial furnace, and the link stopper number can also be more than blast tube.It is more even that the effect of block is to make gas to mix, and short flame combustion is even, effectively improves combustion intensity, and energy savings is effectively improved environmental aspect more than 35%, reduces and pollutes, and is that the utility model is created one of point, is that other burners are unexistent.

For burner is used for hot-blast stove, the vault combustion chamber of hot-blast stove should be placed on the top of burner, and the burner of having formed hot-blast stove together makes up, this device composite entity is placed on (hot-blast stove steel construction shell) supporting ring flat-plate 9, and with interior wall 11 between adopt labyrinth sealing to be connected 10, set up stable body structure with this, this is another characteristics of the utility model.

For burner is used for industrial furnace, burner should be installed on the combustion chamber furnace wall of industrial furnace, allow the nozzle end of burner towards the combustion chamber, and formed the burning zone of industrial furnace together.Be arranged in the number and the position of burning zone burner, and the size decide by the thermic load and the temperature requirement of industrial furnace, its fixing means can adopt various ways.But the structure of burner is immovable.

In a word, the utility model is with simple and rational structure, solved the burner jet-stream wind effectively and mixed not good, key issues such as burning is insufficient, combustion-gas flow speed temperature distributing disproportionation, as be used for that hot-blast stove just can guarantee effectively that hot-blast stove is efficient, high temperature, move safely and steadly; As be used for that industrial furnace can guarantee effectively also that thermal technology industry is efficient, samming, etc. calorific intensity and the operation of safety and stablization ground; Thereby can realize fuel saving, save investment, reduce the good economic and social benefit of EGT and discharge capacity, minimizing environmental pollution.

Claims (4)

1, the burner of the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular, include cylinder (8), coal gas distributes circuit (2a) and air to distribute circuit (2b), it is characterized in that, cylinder (8) is made of exterior wall (1) and the interior wall (11) that moves up and down, exterior wall places on the supporting ring flat-plate (9), interior wall adopts labyrinth sealing to be connected (10) with exterior wall and links together, being provided with coaxial cross section in cylinder (8) exterior wall (1) is the ring-type rectangle circuit of rectangle, by inclination partition wall 2C the circuit symmetry is divided into two chambers up and down in the rectangle circuit, upper chamber is that coal gas distributes circuit (2a), lower chambers is that air distributes circuit (2b), two circuits all are the chamber circuit that progressively shrinks inside gas outlet, there are gas inlet pipe (6) and air intlet pipe (7) to insert respectively in the outer end, place, maximum cross-section of distributing circuit separately, distribute the upper inner of circuit and air to distribute the lower inside of circuit to draw jet for gas pipe (3a) and the air nozzle pipe (3b) that is interspersed along circumferential ring-type respectively at coal gas, jet for gas pipe (3a) and air nozzle pipe (3b) are in the cylinder body wall and parallel with its axis, and number respectively is 20～40; Jet for gas pipe (3a) and air nozzle pipe (3b) are drawn by the upper surface respectively in cylinder, form the jet for gas and the air nozzle of ring-type interlaced arrangement, jet for gas with have above the air nozzle be connected by interior wall and exterior wall top between the coaxial annular premixed conduit (4) that constitutes, be equipped with the current-sharing that the faces nozzle-choked flow link stopper (5) of equilateral triangle on the annular premixed conduit (4).

2, the burner of the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular according to claim 1, it is characterized in that, it is by being the structure that inclination partition wall (2c) that the gradient builds by laying bricks or stones the distribution circuit with whole square-section is split to form that said coal gas distributes circuit (2a) and air to distribute circuit (2b), they are progressively inside chambers of shrinking of gas outlet of symmetry, insert gas inlet pipe (6) and air intlet pipe (7) respectively in outer end, place, maximum cross-section separately.

3, the burner of the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular according to claim 1, it is characterized in that, said coal gas, air nozzle pipe are that the bottom from annular premixed conduit (4) enters, it enters angle and is 0 °～30 ° in relative axis, and the angle of inclination of the hypotenuse of trapezoid cross section of corresponding annular premixed conduit (4) is 0 °～30 °.

4, the burner of the steady flame of premix is sprayed in the staggered current-sharing of a kind of air-flow annular according to claim 1, it is characterized in that the number 〉=jet for gas pipe and the air nozzle pipe number of current-sharing-choked flow link stopper (5) that install on said annular premixed conduit (4) top.

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