CN2328890Y

CN2328890Y - Burner with blunt body

Info

Publication number: CN2328890Y
Application number: CN 98235197
Authority: CN
Inventors: 钱壬章
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 1998-01-23
Filing date: 1998-01-23
Publication date: 1999-07-14
Anticipated expiration: 2008-01-23

Abstract

The utility model relates to a burner with a blunt body, which is composed of a primary air pipe, an expansion pipe connected with the primary air pipe and a blunt body positioned in the expansion pipe. The blunt body is provided with slits whose direction is in conformity with the blow direction through the whole blunt body. The slits and the bottom of the blunt body form an alpha angle which is larger than or equal to 0 DEG and smaller than or equal to 90 DEG. The burner with a blunt body of the utility model can effectively increase flame stability of the reflux zone behind the blunt body, and is suitable for powder coal, combustion gas, combustion fuel, etc.

Description

The burner that has blunt body

The utility model relates to a kind of burner.

The existing burner that has blunt body can form the recirculating zone at the blunt body rear, thus overheavy firing, but efficient still remains to be improved.There is jet nozzle the blunt body bottom surface that the patent of invention ZN86106374 of HUST " a kind of coal burner " adopts, can feed air-flow in the bluff body, and this burner needs additional gas sources, structure complicated.

For overcoming the problem that prior art exists, the utility model has the slit on blunt body, and minority fuel and air-flow can be sent in the recirculating zone at blunt body rear, forms the flame on duty to the main flow igniting.

The utility model has the burner of blunt body, by an airduct, and the convergent divergent channel that connects with airduct, the blunt body that is positioned at convergent divergent channel is formed, and has the slit of running through whole blunt body on the described blunt body, and the slit direction is consistent with air supply direction.

The blunt body center line can also can be departed from the blunt body position of center line in the crack of cracking on the described blunt body, and its quantity can be more than one.

The crack of cracking on the above-mentioned blunt body can be vertical or parallel with the bluff body bottom surface, also can with blunt body bottom surface angulation α, 0 °≤α≤90 °.

Blunt body is the present position in convergent divergent channel, the crack of cracking on the blunt body is overlapped with the extended line of an airduct center line or intersects, also can be so that the extended line of an airduct center line is departed from described slit.

Related blunt body in the aforementioned various technical scheme, its windward side cross-sectional profiles line can be the acutangulate straightway of two bar shapeds, or is curved line;

Described blunt body windward side cross-sectional profiles also can be spliced to form by broken line or by straightway and curved line.Geometric parameters such as the width of blunt body and gap width are determined according to other thermal parameters of boiler structure, fuel type and operation, or are determined by test.

Blunt body of the present utility model is divided into two big strands of air-flows with wind of incoming flow, and in formation recirculating zone, blunt body rear, the slit that is had on the blunt body makes wind of shallow bid and part of fuel send into the recirculating zone, because the shallow bid fuel gas stream very easily catches fire in the recirculating zone, thereby strengthen the ignition energy of recirculating zone to main flow, therefore the utility model can be used for different fuels such as coal dust, combustion gas, fuel oil, and applies to the air velocity scope of broad.

Fig. 1 is the utility model burner three-face view.

Fig. 2 is the blunt body three-face view that has the slit.

Fig. 3 is the schematic diagram of bluff body a kind of position in convergent divergent channel.

Fig. 4 is the different blunt body of shape of cross section with Fig. 5.

Now further describe enforcement state of the present utility model in conjunction with the accompanying drawings.

Fig. 1 (a) is the front view that has the burner of blunt body, airduct 1 among the figure, convergent divergent channel 2; Fig. 1 (b) is the A-A profile of Fig. 1 (a), and expression blunt body 3 is positioned at the expansion pipeline section, has slit 4 on the blunt body 3, and Fig. 1 (c) is the burner left view, can see blunt body 3 bottom surfaces and be fixed in convergent divergent channel.

Fig. 2 (a) is the blunt body front view, and Fig. 2 (b) is its vertical view, and in this embodiment, the blunt body center line is departed from slit 4, and Fig. 2 (c) is the left view of blunt body, and slit 4 is about 75 ° at vertical and the angled α in blunt body bottom surface.

Fig. 3 represents blunt body a kind of position in convergent divergent channel, and under this enforcement state, blunt body windward side cross-sectional profiles line is two straightways that form 60 ° of angles, and the center line extended line of an airduct 1 is departed from the slit 4 on the blunt body.

Blunt body windward side cross-sectional profiles line shown in Figure 4 is a curved line.

Blunt body windward side cross-sectional profiles line shown in Figure 5 is a broken line.

Claims

1, a kind of burner that has blunt body is made up of airduct, the convergent divergent channel that connects with airduct, the blunt body that is positioned at convergent divergent channel, it is characterized in that described blunt body has the slit of running through whole blunt body, and the slit direction is consistent with air supply direction.

2, burner as claimed in claim 1, the blunt body center line is departed from the crack that it is characterized in that cracking on the blunt body.

3, burner as claimed in claim 1 or 2, it is characterized in that cracking on the blunt body crack and blunt body bottom surface angulation α, 0 °≤α≤90 °

4, burner as claimed in claim 1 or 2 is characterized in that blunt body present position in convergent divergent channel makes the crack of cracking on the blunt body depart from the extended line of an airduct center line.

5, burner as claimed in claim 3 is characterized in that blunt body present position in convergent divergent channel makes the crack of cracking on the blunt body depart from the extended line of an airduct center line.

6,, it is characterized in that described blunt body windward side cross-sectional profiles line is the acutangulate straightway of two bar shapeds or is curved line as claim 1,2 or 5 described burners.

7, burner as claimed in claim 3 is characterized in that described blunt body windward side cross-sectional profiles line is the acutangulate straightway of two bar shapeds or is curved line.

8, burner as claimed in claim 4 is characterized in that described blunt body windward side cross-sectional profiles line is the acutangulate straightway of two bar shapeds or is curved line.

9,, it is characterized in that described blunt body windward side cross-sectional profiles line is spliced to form by broken line or by straightway and camber line as claim 1,2 or 5 described burners.

10, burner as claimed in claim 3 is characterized in that described blunt body windward side cross-sectional profiles line is spliced to form by broken line or by straightway and curved line.

11, burner as claimed in claim 4 is characterized in that described blunt body windward side cross-sectional profiles line is spliced to form by broken line or by straightway and curved line.