CN202371711U - Concentrator for coal dust combustor - Google Patents

Abstract

The utility model discloses a concentrator for a pulverized coal burner, which is installed in the primary air duct of the pulverized coal burner, and has a central pipe and an outer sleeve, and a circular enrichment block is installed on the inner wall of the outer sleeve, and its cross section is wedge-shaped. Or trapezoidal, set 2 to 4 rings, toward the direction of the spout side, the diameter of the concentrated block decreases ring by ring. Through the thickening block, the primary air pulverized coal flow can form a distribution of thick inside and light outside at the burner nozzle.

Description

Concentrator for pulverized coal burner

technical field

The utility model relates to a concentrator for a pulverized coal burner. the

Background technique

In the pulverized coal burner of power plant boiler, in order to make the distribution of pulverized coal particles in the primary air/ pulverized coal flow meet the requirements of specific burner design, various pulverized coal concentration structures are used, so that the pulverized coal can be concentrated , but if it is not handled properly, it will cause problems such as poor concentration effect, complex structure and serious wear, making it difficult to achieve the ideal concentration effect and combustion performance requirements. the

Utility model content

The purpose of this utility model is to provide a concentrator structure applied to the pulverized coal burner of the power station boiler, which is installed in the primary air pipe of the pulverized coal burner, and is used to realize the concentration distribution along the radial direction at the nozzle of the burner to form a primary air / The distribution of pulverized coal particles in the pulverized coal airflow is a pulverized coal airflow structure with thick inside and light outside. the

In order to achieve the above purpose, the technical solution of the utility model is: a concentrator for pulverized coal burner, which is installed in the primary air duct of the pulverized coal burner, has a central pipe and an outer sleeve, and a circular ring is installed on the inner wall of the outer sleeve. The enrichment block has a wedge-shaped or trapezoidal cross-section, and 2 to 4 rings are arranged, and the diameter of the ring-shaped enrichment block decreases ring by ring toward the side of the spout. the

Along the airflow direction, on the center pipe corresponding to the rear position of the enrichment block, an annular pulverized coal turning baffle is set.

The expansion cone angle α of the circular enrichment block is 10-35°. the

The expansion cone angle β of the pulverized coal turning baffle is 10-35°. the

A thick-thin separation cylinder is arranged from the annular thickening block closest to the spout to the spout. the

Through the structure of the concentration block and the separation cylinder, the primary air pulverized coal flow forms a distribution of thick inside and light outside at the burner nozzle, and the final concentration ratio of pulverized coal can be changed by changing the position and angle of the concentration block. the

Description of drawings

Figure 1 is a schematic diagram of the structure of the concentrator for pulverized coal burner

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the utility model is not limited to the following embodiments. the

As shown in Figure 1, a concentrator for a pulverized coal burner has a central tube 1 and an outer sleeve 2, and an annular thickening block 3 is installed on the inner wall of the outer sleeve 2, and the cross section of the thickening block 3 is wedge-shaped or trapezoidal. A 3-ring enrichment block is provided, and the diameter of the enrichment block decreases ring by ring toward the nozzle side, and the expansion cone angle α of the enrichment block 3 is 10-35°. The 2nd, the 3rd ring concentration block 3 that diameter dwindles can be connected and supported on the central tube 1 or the outer sleeve 2 with a steel plate (the supporting steel plate is not shown in the figure). The action of the concentration block 3 separates the pulverized coal airflow under the action of inertia, forming a thin pulverized coal airflow on the outer side and a dense pulverized coal airflow on the center side. A thick-thin separation cylinder 5 is set between the concentration block 3 closest to the spout and the spout, and the thick-thin pulverized coal gas flow is divided into two channels into the furnace by the thick-thin separation cylinder 5, so as to avoid remixing of the concentrated and separated gas flow. Corresponding to the rear position of the enrichment block 3 on the center pipe 1, a pulverized coal diversion baffle 4 is provided to prevent the pulverized coal flow due to inertial separation and diversion from wearing the central sleeve. The section of the pulverized coal diversion baffle 4 is wedge Shaped or trapezoidal, 2 ring pulverized coal steering baffles 4 are provided, and the expansion cone angle β of pulverized coal steering baffles 4 is 10-35 °. the

The concentrator is installed in the center of other structures (such as burners) as a whole. The central sleeve is the same as the outer sleeve. It is mainly fixed by connecting with other structures on the burner. The structure of the concentrator is not connected. The thickening block structure is installed on the sleeve and the outer sleeve to achieve the effect of pulverized coal concentration. the

Claims (5)

1. a coal burner is used inspissator, is installed in airduct of coal burner, has central tube (1) and outer sleeve (2); It is characterized in that; On sleeve (2) inwall annular concentrated block (3) is installed outside, its cross section is a wedge or trapezoidal, and 2～4 rings are set; Towards the spout side direction, the diameter of concentrated block (3) reduces by ring.

2. coal burner according to claim 1 is used inspissator, it is characterized in that, along airflow direction, the position after central tube (1) upward leans on corresponding to annular concentrated block (3) is provided with coal dust diversion baffle (4).

3. coal burner according to claim 1 is used inspissator, it is characterized in that, the expansion cone angle of said annular concentrated block (3) is 10-35 °.

4. coal burner according to claim 2 is used inspissator, it is characterized in that, the expansion cone angle beta of said coal dust diversion baffle (4) is 10-35 °.

5. use inspissator according to each described coal burner of claim 1 to 4, it is characterized in that, near annular concentrated block (3) to the spout place of spout deep or light separating tube (5) is being set.