CN2157400Y

CN2157400Y - Shutter coal powder thickener

Info

Publication number: CN2157400Y
Application number: CN 93209806
Authority: CN
Inventors: 秦裕琨; 邢春礼; 孙绍增; 吴少华; 孙恩召; 杨明新
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 1993-04-10
Filing date: 1993-04-10
Publication date: 1994-02-23
Anticipated expiration: 2003-04-10

Abstract

The utility model discloses a shutter coal powder thickener which comprises a primary air pipeline, a thickener casing, a shutter, a thick coal powder air-stream outlet and a thin coal powder air-stream outlet, wherein, the shutter is composed of a plurality of thickening barriers arranged between the air-stream inlet and the air-stream outlet in a staggered mode. The primary air can be divided into thick and thin coal powder air-streams, and the thickness difference between the thick and the thin coal powder air-streams can reach to three to nine times. The coal powder thickener has the advantages of high thickening ratio, small resistance, simple structure and convenient arrangement. The utility model is particularly suitable for the horizontal thickening coal powder burning mode for realizing coal dust burning and high efficient stable burning, and preventing slagging and low discharging of Nox simultaneously.

Description

Shutter coal powder thickener

The utility model relates to the boiler coal-ash inspissator, particularly horizontal pulverized coal concentrator.

Concentrated pulverized fuel combustion is the coal dust firing frontier, and representative work is " a kind of concentrated coal-ash burner " that professor Qin Yukun of Harbin Institute of Technology proposes, (ZL92224103.1).This horizontal concentrated coal-ash burner can be realized efficient, the steady combustion of coal dust firing, anti-slagging scorification and low NO simultaneously _XDischarging.But realize that this combustion system needs simple in structure a, arrangement convenience, cocnentration factor height and the little pulverized coal concentrator of resistance.The disclosed pulverized coal concentrator of Chinese patent CN89200682 and CN912173025 is bent-tube boiler, and its shortcoming is that cocnentration factor is little, only is about 2 as its cocnentration factor of CN89200682; The stokehold difficult arrangement.Therefore be unsuitable for realizing simultaneously efficient, the steady combustion of coal dust firing, anti-slagging scorification and low NO _XThe horizontal concentrated pulverized fuel combustion mode of discharging especially is difficult to realize anti-slagging scorification and low NO _XDischarging.

The utility model is the shortcoming of little at the existing cocnentration factor that is used for horizontal concentrated pulverized fuel combustion pulverized coal concentrator of stokehold difficult arrangement and a kind of simple in structure, the arrangement convenience, cocnentration factor height and the little new coal powder inspissator of resistance that propose are called louver pulverized coal concentrator.

The utility model is achieved by following manner: louver pulverized coal concentrator comprises airduct road 1 one time, inspissator shell 2, the shutter of being made up of a plurality of concentrated grid 3 places between the shunting plate washer 7 of air flow inlet 8 and air stream outlet, concentrating the grid number is 3-11, each concentrated pitch of shed β=25-30 degree, adjacent concentrated grid are misplaced arrangement, are misplaced width D ₁With ratio ψ=0.5-1 of concentrated grid width D, resistance system ξ=1.7～4 concentrate the join thick coal culm air stream outlet 4 that constitutes and 5, airduct roads of thin powdered coal air stream outlet and inspissator shell of grid by triangle shunting plate washer 9 and shutter afterbody and are connected in series; Shutter is divided into very big two strands of concentration difference, promptly dense and thin powdered coal air-flow to wind breeze airflow; Dense, thin powdered coal air stream outlet is parallel to each other and is positioned on the same horizontal plane, and its level interval is 0.1～5 times of dense, thin powdered coal air stream outlet width, the cross section F of thick coal culm airflow path _rWith all concentrated cross section, grid gap sum ∑ S ₁Ratio φ=0.25～0.35.

Operation principle of the present utility model is that a wind breeze airflow flows into louver pulverized coal concentrator through an airduct road, when breeze airflow flows to shutter, because the inertia of pulverized coal particle is big, most of pulverized coal particle can be got off by the concentrated grid resistance shelves of shutter and can not pass through shutter; On the other hand, when the part breeze airflow passes through shutter, the part pulverized coal particle that flows with this part air-flow is concentrated under the grid resistance retaining by shutter departing from the air current flow direction on the centrifugal action because air-flow curves.Through the barrier effect of a plurality of concentrated grid to breeze airflow, last, one time the wind breeze airflow is divided into very big dense, the light two strands of breeze airflows of concentration difference, and concentration difference can reach 3-9 doubly.Very big for guaranteeing two bursts of air-flow concentration difference, by adjusting shutter, two bursts of air capacities in the breeze airflow are equated, dense, thin powdered coal outlet static pressure is equated, so also can make the resistance of inspissator remain on lower level.This shows, owing to adopt shutter as concentrated element, therefore simple in structure; Inspissator and an airduct road are connected in series, inspissator itself also is the suitable cuboid in cross section and cross section, an airduct road, so arrangement convenience, by adjusting shutter, the ratio that can make the coal powder density of dense, light two strands of breeze airflows is that cocnentration factor reaches 3～9; Drag losses is also little simultaneously, calculates with the inlet primary air velocity, and resistance coefficient ξ is 1.7-4.

In sum, the utility model is compared with existing inspissator, has promptly overcome bent-tube boiler pulverized coal concentrator cocnentration factor shortcoming little, that structural configuration is difficult and has had advantage simple in structure, that resistance is little again.Therefore be suitable for realizing simultaneously the efficient of coal dust firing, steady combustion, anti-slagging scorification and low NO _XThe horizontal concentrated pulverized fuel combustion of discharging is because this louver pulverized coal concentrator can be guaranteed efficient, the steady combustion of coal dust firing, anti-slagging scorification and low NO _XHesitate and put, therefore, it increases coal adaptability for the security of raising boiler operatiopn, reduces and pollutes, and energy savings and the blowing out of minimizing boiler breakdowns etc. are all significant, and therefore very big economic implications and social effect are arranged.

Fig. 1 is a structure principle chart of the present utility model.In the drawings, 1 is an airduct road, 2 inspissator shells, 3 shutters, 4 thick coal culm air stream outlets, 5 thin powdered coal air stream outlets.F _rBe dense airflow path smallest cross-sectional, S ₁Be that adjacent two shutters concentrate the cross section in grid gap, β is for concentrating pitch of shed, and D is for concentrating the grid width that facings the wind, D ₁Be the distance that adjacent concentrated grid are misplaced on the windward side mutually, 6 for concentrating grid.H ₁H is dense, thin powdered coal air stream outlet width and spacing, 7 shunting plate washers, 8 air flow inlets.

Most preferred embodiment of the present utility model, as shown in Figure 1.Louver pulverized coal concentrator comprises the airduct road one time, inspissator shell, shutter, 5 concentrated grid, thick coal culm air stream outlet and the thin powdered coal air stream outlet of composition shutter.The inspissator shell in airduct road and rectangle cross section is connected in series; The shutter that is made of 5 concentrated grid is divided into concentration difference to wind breeze airflow and reaches 6 times dense, light two strands, the smallest cross-sectional F of thick coal culm airflow path _rWith whole cross section, grid gap and the ∑ S of concentrating that flow through all thin powdered coal air-flows ₁Ratio be φ=0.35, adjacent concentrated grid are misplaced width D ₁With the ratio of concentrated grid width D be that shutter concentrates grid and covers rate ψ=0.7 and constitute the concentrated grid number n of shutter=5, concentrated pitch of shed β=30 °, inspissator resistance coefficient ξ=2.0, more than each parameter best value according to use occasion (generating, heat supply etc.), the burning coal, concrete application background such as primary air velocity and deciding; The outlet of dense, light two breeze airflows is rectangle, is parallel to each other and is positioned at same horizontal plane, and two outlet spacing H are dense or thin powdered coal air stream outlet width H ₁0.7 times, decide on concrete application background, in order to prevent wearing and tearing, inspissator is by the cast steel manufacturing, shutter concentrates grid and carries out surface wear-resistant material built-up welding manufacturing with steel plate.

Claims

1, a kind of louver pulverized coal concentrator comprises an airduct road [1], inspissator shell [2], and an airduct road [1] and inspissator shell is characterized in that comprising for being connected in series:

A shutter [3] of being made up of a plurality of concentrated grid [6] places between the shunting plate washer [7] of air flow inlet [8] and air stream outlet, and the number that concentrates grid is 3-11, each concentrated pitch of shed β=25-30 degree, and adjacent concentrated grid are misplaced arrangement, are misplaced width D ₁With the ratio ψ=0.5-1 of concentrated grid width, resistance coefficient ξ=1.7～4;

Concentrate a thick coal culm outlet [4] and and the thin powdered coal outlet [5] that grid join and constitute by triangle shunting plate washer [7] and shutter afterbody, dense, thin powdered coal outlet is parallel to each other and is positioned on the same horizontal plane, and its spacing H is dense, thin powdered coal air stream outlet width H ₁0.1～5 times, the cross section F of thick coal culm airflow path _rWith all concentrated cross section, grid gap sum ∑ S _iRatio φ=0.25～0.35.