CN102494337B

CN102494337B - Plasma oil-free ignition staged combustion system

Info

Publication number: CN102494337B
Application number: CN201110441096.1A
Authority: CN
Inventors: 郑路
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2011-12-26
Filing date: 2011-12-26
Publication date: 2014-04-09
Anticipated expiration: 2031-12-26
Also published as: CN102494337A

Abstract

The invention discloses a plasma oil-free ignition staged combustion system, which comprises a plasma generator and a combustor, wherein a staged combustion sleeve is arranged in the combustor and is provided with a sleeve main body; the sleeve main body is arranged coaxially or parallelly with the combustor; and an enlarged taper is arranged on an outer wall surface of the sleeve main body along the circumference. By the technical scheme, because an outlet of the sleeve main body is provided with the enlarged taper, a peripheral length on an end face of the outlet of the staged combustion sleeve is increased, entrainment which is stronger than that generated without the enlarged taper can be formed at the outlet of the sleeve main body, a stable high-temperature flue gas backflow area can be established, the mixing of ignited pulverized coal and unignited pulverized coal inside the combustor is enhanced, the backflow of high-temperature flue gas is strengthened, the ignition success rate is improved, and a stable combustion effect is achieved.

Description

A kind of plasma oil-free ignition staged combustion system

Technical field

The invention belongs to thermal boiler field, relate to the combustion system of boiler, relate in particular to a kind of plasma oil-free ignition staged combustion system.

Background technology

The mode that traditional station boiler igniting generally adopts is grease gun igniting.During boiler ignition start, first put oil combustion gun, after the oily certain hour that burns, burner hearth is heated to the ignition temperature of breeze airflow in burner hearth, now coal dust is blown into burner hearth and carries out oily coal multifuel combustion.When boiler reaches more than 50% load, when breeze airflow can smooth combustion, fuel oil is excised gradually, complete boiler ignition start process.For cost-saving, reduce the fuel oil consumption of station boiler, lot of domestic and international company has developed multiple plasma oil-free ignition combustor, and is widely used on a lot of station boilers.

Plasma oil-free ignition combustor is a kind of internally fired device, power less (power of general plasma generator is 90～120KW) due to plasma generator, be not enough to directly light whole wind breeze airflows of boiler main burner, so one of design philosophy of existing plasma oil-free ignition combustor is " multistep ignition, amplify step by step ", by plasma generator ejection high-temperature plasma, in burner, light part coal dust, form new, the large incendiary source of thermal power, remove again to light other a part of coal dust, form another larger incendiary source, this " multistep ignition of final employing, amplify step by step " mode, light whole wind breeze airflows of main burner.So it is very crucial that the design quality of plasma oil-free ignition combustor is lighted the success or not of a wind breeze airflow for high-temperature plasma.

Burner in existing plasma oil-free ignition staged combustion system, adopts the hierarchy of metal thin-wall cylinder more.There is blending in the breeze airflow of having lighted and unlit breeze airflow, mixing effect is poor in cylinder exit, cause lighting with steady fuel efficiency fruit of breeze airflow also poor.

Summary of the invention

The object of the present invention is to provide the plasma oil-free ignition staged combustion system that a kind of ignition success rate is high, smooth combustion is effective.

In order to achieve the above object, the present invention adopts following technical solution to be achieved: a kind of plasma oil-free ignition staged combustion system, comprise plasma generator and burner, in burner, be furnished with fractional combustion sleeve, fractional combustion sleeve has sleeve body, the coaxial layout of sleeve body and burner, in the outside wall surface of sleeve body, has reamer body along circumferential arrangement.Adopt the technical program, because the outlet of sleeve body has the existence of reamer body profile, increased the circumferential length on fractional combustion sleeve exit end face, when a wind breeze airflow is blown over fractional combustion sleeve, can form than there is no stronger the entrainmenting of reamer body profile in the exit of sleeve body, can set up stable high temperature gases recirculating district, strengthened the blending of firing coal-dust and unignited coal dust of burner inside, strengthened the backflow of high-temperature flue gas, more coal dust is heated, improved the success rate of igniting, and played the effect of smooth combustion.

The principle of a kind of plasma oil-free ignition staged combustion system of the present invention is, fractional combustion sleeve is divided into two parts by breeze airflow, plasma generator ejection high-temperature plasma is lighted the breeze airflow entering in fractional combustion sleeve, and at fractional combustion sleeve, go out that interruption-forming is new, stable, the larger incendiary source of thermal power, and utilize this incendiary source to light remaining breeze airflow.

Expansion centrum is hollow, and is evenly arranged vertically, and the cone point of reamer body is in the import department of sleeve body, at the bottom of the cone of reamer body in the exit of sleeve body.This technical scheme, can further improve ignition success rate, plays better smooth combustion effect.

On the wall of fractional combustion sleeve, along being circumferentially evenly arranged the hollow reamer body structure of some.The tapering of reamer body is generally 1 °～45 °, and optimized angle is 5 °～10 °.The quantity of reamer body is generally 2～360, and preferably number is 2～20.

The cone point of reamer body is in the import department of fractional combustion sleeve, and at the bottom of the cone of reamer body, in the exit of fractional combustion sleeve, the shape of cross section of reamer body is triangle, rectangle, the scarce shape of circle, or other have the shape of simple geometry profile.

Fractional combustion sleeve is thin-wall face cylinder, and its shape of cross section is circular, oval, or the regular polygon shape such as triangle, square, regular pentagon, or other polygonal shapes, with circular or square for the most common.

Advantage of the present invention is: when ignition of the boiler, this system is utilized the direct firing coal-dust airflow of high-temperature plasma, without fuel oil baker, has very high oil-saving effect.The design of the fractional combustion sleeve by burner inside, sets up stable high temperature gases recirculating district in burner inside, the lighting and steady fuel efficiency fruit of strengthening breeze airflow.The present invention, concept is distinct, simple in structure, reasonable in design, and investment and operating cost are moderate, and cost performance is high.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail;

Fig. 1 is staged combustion systems schematic diagram;

Fig. 2 is the fractional combustion sleeve schematic diagram (square fractional combustion sleeve is furnished with rectangle reamer body) of embodiment 1;

Fig. 3 is that A in Fig. 2 is to view;

Fig. 4 is that B in Fig. 2 is to view;

Fig. 5 is that C-C in Fig. 4 is to view;

Fig. 6 is that D-D in Fig. 4 is to view;

Fig. 7 is the fractional combustion sleeve schematic diagram (circular fractional combustion sleeve is furnished with circle and lacks reamer body) of embodiment 2;

Fig. 8 is that A in Fig. 7 is to view;

Fig. 9 is that B in Fig. 7 is to view;

Figure 10 is that C-C in Fig. 9 is to view;

Figure 11 is the fractional combustion sleeve schematic diagram (regular pentagon fractional combustion sleeve is furnished with triangle reamer body) of embodiment 3;

Figure 12 is that A in Figure 11 is to view;

Figure 13 is that B in Figure 11 is to view;

Figure 14 is that C-C in Figure 13 is to view.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, but the present invention is not limited to following embodiment.

Embodiment 1

With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a kind of plasma oil-free ignition staged combustion system of the present invention, comprises plasma generator 1 and burner 2.In burner 2, be furnished with fractional combustion sleeve 3, fractional combustion sleeve 3 and burner 2 are coaxial or be arranged in parallel.Fractional combustion sleeve 3 has sleeve body 31, the cross sectional shape of sleeve body 31 is that square is furnished with rectangle reamer body 32, each side of sleeve body 31 is arranged symmetrically with 2 rectangle reamer bodies 32, rectangle reamer body 32 has the tapering of 5 °, cone point is in the import department of sleeve body 31, in the exit of sleeve body 31, sleeve body 31 and rectangle reamer body 32 are as a whole at the cone end.

During ignition of the boiler, plasma generator 1 inserts this burner 2, and the high-temperature plasma of plasma generator 1 ejection fills in fractional combustion sleeve 3.Fractional combustion sleeve 3 is divided into two parts by a wind breeze airflow, high-temperature plasma is lighted the wind breeze airflow of a part in the fractional combustion sleeve 3 of flowing through, and in the exit of fractional combustion sleeve 3, form incendiary source new, stable, that thermal power is larger, and light wind breeze airflow of remaining another part.

The outlet of fractional combustion sleeve 3, because there is the existence of rectangle reamer body profile, has more increased the circumferential length on fractional combustion sleeve 3 exit end faces.When a wind breeze airflow is blown over fractional combustion sleeve 3, can form than there is no stronger the entrainmenting of reamer body profile in the exit of fractional combustion sleeve 3, can set up stable high temperature gases recirculating district, strengthened the blending of firing coal-dust and unignited coal dust of burner inside, strengthened the backflow of high-temperature flue gas, more coal dust is heated, improved the success rate of plasma non-oil ignition and the effect of smooth combustion.

Embodiment 2

With reference to Fig. 1, Fig. 7, Fig. 8, Fig. 9 and Figure 10, the difference of the present embodiment and embodiment 1 is, in the present embodiment, the sleeve body 31 of fractional combustion sleeve 3 adopts circles to be equipped with circle to lack reamer body 32.4 circles lack reamer bodies 32 and are evenly arranged in circumference side, and the cone point of reamer body is in the import department of sleeve body 31, at the bottom of the cone of reamer body in the exit of sleeve body 31.Reamer body 32 has the tapering of 5 °, and it is as a whole that sleeve body 31 and circle lack reamer body 32.

Embodiment 3

With reference to Fig. 1, Figure 11, Figure 12, Figure 13 and Figure 14, the difference of the present embodiment and embodiment 1 is, in the present embodiment, the sleeve body 31 of fractional combustion sleeve 3 adopts regular pentagons to be equipped with triangle reamer body 32.5 triangular shaped reamer bodies 32 are evenly arranged in the side of regular pentagon, and the cone point of reamer body is in the import department of sleeve body 31, at the bottom of the cone of reamer body in the exit of sleeve body 31.Reamer body 32 has the tapering of 5 °, and sleeve body 31 and triangular shaped reamer body 32 are as a whole.

Claims

1. a plasma oil-free ignition staged combustion system, comprise plasma generator (1) and burner (2), in burner (2), be furnished with fractional combustion sleeve (3), fractional combustion sleeve has sleeve body (31), sleeve body (31) is arranged in parallel with burner (2), it is characterized in that, in the outside wall surface of sleeve body (31), along circumferential arrangement, having reamer body (32); Described expansion centrum (32) is hollow, and along being circumferentially evenly arranged, and the cone point of reamer body (32) is in the import department of sleeve body (31), at the bottom of the cone of reamer body (32) in the exit of sleeve body (31); Described sleeve body (31) is thin-wall face cylinder, and its shape of cross section is circle, triangle, square or regular pentagon; Fractional combustion sleeve (3) is a thin walled cylinder body that cross-sectional area amplifies gradually; During ignition of the boiler, plasma generator (1) inserts this burner (2), and the high-temperature plasma of plasma generator (1) ejection fills in fractional combustion sleeve (3).

2. plasma oil-free ignition staged combustion system according to claim 1, is characterized in that, the tapering of described reamer body (32) is 1 °～45 °.

3. plasma oil-free ignition staged combustion system according to claim 1, is characterized in that, the quantity of described reamer body (32) is 2～360.

4. plasma oil-free ignition staged combustion system according to claim 1, it is characterized in that, described sleeve body (31) is thin-wall face cylinder, and its shape of cross section is circle, ellipse, triangle, square, regular pentagon or other polygonal shapes.

5. plasma oil-free ignition staged combustion system according to claim 3, is characterized in that, the tapering of described reamer body (32) is 5 °～10 °.

6. plasma oil-free ignition staged combustion system according to claim 4, is characterized in that, the quantity of described reamer body (32) is 2～20; Described sleeve body (31) and the coaxial layout of burner (2).