CN201166362Y - Low NOX coal-powder combustor - Google Patents
Low NOX coal-powder combustor Download PDFInfo
- Publication number
- CN201166362Y CN201166362Y CNU2007200888297U CN200720088829U CN201166362Y CN 201166362 Y CN201166362 Y CN 201166362Y CN U2007200888297 U CNU2007200888297 U CN U2007200888297U CN 200720088829 U CN200720088829 U CN 200720088829U CN 201166362 Y CN201166362 Y CN 201166362Y
- Authority
- CN
- China
- Prior art keywords
- burner
- bluff body
- burner housing
- trapezoidal side
- side bluff
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model provides a low NOX pulverized coal burner, which comprises a burner casing which is provided with an inlet end and an outlet end, a ladder-shaped side bluff body is arranged between two opposite lateral walls of the burner casing, at least four ladder-shaped blocks are arranged on the other two lateral walls near the outlet end of the burner casing, and at least a projection can be arranged out of the ladder-shaped side bluff body. The low NOX pulverized coal burner adopts a ladder-shaped distribution type structure to regulate the pulverized coal enrichment area and the enrichment degree on the jet tip of the burner and form oxygen concentration and pulverized coal concentration which can prompt burning and inhibit generating NOX, and reach the effects of high-effective burning and low NOX discharging.
Description
Technical field
The utility model belongs to the Thermal Energy and Power Engineering field, especially relates to coal burning boiler of power station and industry coal-boiler.
Background technology
The data investigation shows that domestic and international application or coal burner newly developed generally are to adopt the bluff body of non-streamline to form methods such as smoke backflow, coal powder light-dark separation or fractional combustion at present, promote the coal powder ignition burning and reduce NO
XDischarging.These methods are to NO in the process of coal combustion
XMinimizing limited, NO in the fume emission behind the coal dust firing in most cases
XStill do not reach national standard.
The utility model content
The purpose of this utility model is the flue gas NO that reduces in the coal dust firing
XDischarge capacity reaches national environmental standard.
Technical solutions of the utility model are:
A kind of low NO
XCoal burner, comprise burner housing with entrance point and port of export, it is characterized in that, between the burner housing two lateral walls, be provided with the trapezoidal side bluff body, be provided with at least four trapezoid blocks in the position of the close port of export of the other two lateral walls of burner housing.
Described trapezoidal side bluff body comprises two measure-alike and crossing rectangular slabs, and two crossing entrance points of holding towards burner housing of rectangular slabs, and two rectangular slabs intersect end and are connected with the burner housing two lateral walls.
Outside at least one projection that forms of described rectangular slab.
Described trapezoidal side bluff body is 0～0.25 with the sidewall that burner housing exit separation and burner housing link to each other with the trapezoidal side bluff body at the ratio of port of export length towards an end of the burner housing port of export.
Described trapezoid block comprises a trapezoidal plate and two set square measure-alike and that intersect with trapezoidal plate two waists respectively, and the upper base of trapezoidal plate is towards the entrance point of burner housing, and two set squares are positioned at the homonymy of trapezoidal plate.
The trapezoid block height is 0.15～0.21 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at port of export length ratio, the ratio of trapezoid block height and homonymy trapezoid block spacing is 0.3～0.55, trapezoidal side bluff body width is 0.3～0.4 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at the ratio of port of export length, trapezoidal side bluff body apex angle equals 35 °～50 °, and burner housing subtended angle β equals 10 °～16 °.
The trapezoid block height is 0.15～0.21 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at port of export length ratio, the ratio of trapezoid block height and homonymy trapezoid block spacing is 0.3～0.55, trapezoidal side bluff body width is 0.3～0.4 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at the ratio of port of export length, trapezoidal side bluff body apex angle equals 38 °～53 °, and burner housing subtended angle β equals 12 °～18 °.
The utility model adopts trapezoidal distribute type structure to adjust the coal dust enrichment region zone and the enrichment degree at burner nozzle place, and formation can promote burning to suppress NO again
XThe oxygen concentration and the coal powder density that generate.When breeze airflow during in the trapezoidal allocation component by burner, owing to be subjected to influence by a plurality of trapezoid blocks, the mobile of regional area breeze airflow changes, and coal dust is different with the density or the inertia of air, thereby cause that coal dust obtains enrichment in one section zone in burner outlet downstream, obtain high efficiency and combustion with reduced pollutants condition thus, reach efficient burning and low NO
XThe effect of discharging.
Description of drawings
Fig. 1 is the utility model front view;
Fig. 2 is the utility model side sectional view;
Fig. 3 is the A-A cutaway view among Fig. 1.
The specific embodiment
The utility model is the low NO of trapezoidal distribute type
XCoal burner, NO
XBe nitric oxide NO and nitrogen dioxide NO
2General name.Fig. 1 has provided the utility model structural representation, and this burner comprises burner housing 1, trapezoidal side bluff body 2 and a plurality of trapezoid block 3.
As shown in Figure 2, trapezoidal side bluff body 2 constitutes by the rectangular slab of two same sizes is crossing, the intersection forms apex angle, rectangular slab outside at trapezoidal side bluff body 2 can form one or more projection, projection can change the coal dust and air mixing two phase flow flow field of burner outlet outside, can more effectively reduce NO
XDischarge capacity.Trapezoidal side bluff body 2 is arranged between burner housing 1 two lateral walls A1, the A2 on the centre position, and two rectangular slabs intersect end towards burner housing 1 entrance point, and two rectangular slabs intersect end two and are connected with sidewall A1, A2 respectively.
As Fig. 1, Fig. 2 and shown in Figure 3, trapezoid block 3 comprises a trapezoidal plate and the set square of two same sizes intersecting with trapezoidal plate two waists respectively, trapezoid block 3 is installed on burner housing 1 port of export other relative two madial wall B1, the B2, and the trapezoidal plate upper base is towards the entrance point of burner housing 1.For the installation of trapezoid block 3, can locate size according to this trapezoid block 3 is done corresponding cutting at four jiaos of places of burner housing 1 outlet sidewall.
As shown in Figure 2, burner housing 1 sidewall B1, B2 expand outwardly gradually at place, the middle part of the side and form subtended angle β.
The coal powder density size of burner outlet regional area can be controlled in trapezoid block 3 and trapezoidal side bluff body 2 mutual alignments, is this burner overheavy firing and reduction NO
XThe key factor of discharging.Make trapezoidal distribute type hang down NO
XThe use of coal burner in boiler can be played smooth combustion and reduce the discharged nitrous oxides effect, and makes the NO in the flue gas of burning back
XDischarging reaches national environmental standard, must determine that trapezoidal distribute type hangs down NO according to the nitrogen content in coal and the coal
XThe structural parameters of burner, its main structure parameters has: sidewall A1, the A2 of burner housing 1 subtended angle β, burner housing 1 is in exit length H, trapezoidal side bluff body 2 apex angle, trapezoidal side bluff body 2 width L, trapezoidal side bluff body 2 non-crossing ends and burner 1 housing outlet spacing M, trapezoid block 3 numbers, homonymy trapezoid block 3 spacing C, trapezoid block 3 height B, above structural parameters should be determined by the power and the coal of burner, and consider the boiler design parameter, i.e. wind-warm syndrome, primary air ratio, primary air velocity.Trapezoidal side bluff body width L refers to two ultimate ranges between the rectangular slab, and the trapezoid block height B is meant the distance of burner housing 1 sidewall that this trapezoid block 3 connected of going to the bottom trapezoidal plate.
Table 1 has provided this burner structure B parameter: H, B:C, L:H, α and the β span according to coal and nitrogen content of coal content.
Table 1. the utility model main structure parameters
Generally speaking, the trapezoidal side bluff body is towards an end and burner outlet spacing M of the burner housing port of export: the sidewall that burner housing 1 links to each other with trapezoidal side bluff body 2 is in exit length H=0～0.25.The number of trapezoid block 3 is minimum to be 4, and allows to adjust according to the boiler practical operation situation.
The position of a plurality of trapezoid blocks 3 and size and determined the enrichment degree of coal dust and the position at rich region place.If the ature of coal difference, power difference, then its fuel NO
XFormation condition and position just different, so also difference of the size of the trapezoid block 3 of this burner.By adjusting trapezoid block 3 sizes, make coal dust in the suitable zone of burner outlet, carry out enrichment, form rational fuel-rich region, both helped catching fire of coal dust, can suppress the nitrogen content of coal element again to NO
XTransform, thereby reach the high-efficiency cleaning burning.
Investigation shows the low NO that does not also find to use trapezoidal distribute type structure
XThe coal burner technology.The use of this burner can be with the flue gas NO in the coal dust firing
XDischarging obviously reduces, the NO in the boiler emission flue gas
XReach national environmental standard.If in the application of this burner,, and carry out primary and secondary air spout relative position and redesign and arrange, then NO in the coal powder boiler combustion process simultaneously in conjunction with after-flame wind (OFA) technology
XDischarging also will further reduce.
Claims (6)
1, a kind of low NO
XCoal burner, comprise burner housing with entrance point and port of export, it is characterized in that, between the burner housing two lateral walls, be provided with the trapezoidal side bluff body, be provided with at least four trapezoid blocks in the position of the close port of export of the other two lateral walls of burner housing.
2, low NO according to claim 1
XCoal burner is characterized in that, described trapezoidal side bluff body comprises two measure-alike and crossing rectangular slabs, and two crossing entrance points of holding towards burner housing of rectangular slabs, and two rectangular slabs intersect end and are connected with the burner housing two lateral walls.
3, low NO according to claim 2
XCoal burner is characterized in that, outside at least one projection that forms of described rectangular slab.
4 low NO according to claim 2
XCoal burner is characterized in that, described trapezoidal side bluff body is 0～0.25 with the sidewall that burner housing exit separation and burner housing link to each other with the trapezoidal side bluff body at the ratio of port of export length towards an end of the burner housing port of export.
5, low NO according to claim 1
XCoal burner is characterized in that, described trapezoid block comprises a trapezoidal plate and two set square measure-alike and that intersect with trapezoidal plate two waists respectively, and the upper base of trapezoidal plate is towards the entrance point of burner housing, and two set squares are positioned at the homonymy of trapezoidal plate.
6, according to any described low NO in the claim 1 to 5
XCoal burner, it is characterized in that, the trapezoid block height is 0.15～0.21 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at port of export length ratio, the ratio of trapezoid block height and homonymy trapezoid block spacing is 0.3～0.55, trapezoidal side bluff body width is 0.3～0.4 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at the ratio of port of export length, trapezoidal side bluff body apex angle equals 35 °～50 °, and burner housing subtended angle β equals 10 °～16 °.
7, according to any described low NO in the claim 1 to 5
XCoal burner, it is characterized in that, the trapezoid block height is 0.15～0.21 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at port of export length ratio, the ratio of trapezoid block height and homonymy trapezoid block spacing is 0.3～0.55, trapezoidal side bluff body width is 0.3～0.4 with the sidewall that burner housing links to each other with the trapezoidal side bluff body at the ratio of port of export length, trapezoidal side bluff body apex angle equals 38 °～53 °, and burner housing subtended angle β equals 12 °～18 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200888297U CN201166362Y (en) | 2007-12-07 | 2007-12-07 | Low NOX coal-powder combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200888297U CN201166362Y (en) | 2007-12-07 | 2007-12-07 | Low NOX coal-powder combustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201166362Y true CN201166362Y (en) | 2008-12-17 |
Family
ID=40191752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200888297U Expired - Lifetime CN201166362Y (en) | 2007-12-07 | 2007-12-07 | Low NOX coal-powder combustor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201166362Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187472B (en) * | 2007-12-07 | 2010-06-16 | 华中科技大学 | Low NOx pulverized coal burner |
| CN107407482A (en) * | 2015-03-31 | 2017-11-28 | 三菱日立电力系统株式会社 | burner and boiler |
-
2007
- 2007-12-07 CN CNU2007200888297U patent/CN201166362Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101187472B (en) * | 2007-12-07 | 2010-06-16 | 华中科技大学 | Low NOx pulverized coal burner |
| CN107407482A (en) * | 2015-03-31 | 2017-11-28 | 三菱日立电力系统株式会社 | burner and boiler |
| US10605455B2 (en) | 2015-03-31 | 2020-03-31 | Mitsubishi Hitachi Power Systems, Ltd. | Combustion burner and boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20081217 Effective date of abandoning: 20071207 |