Flow equalizing low-resistance dust dedusting system

Abstract

This invention relates to the equalization-flow and low resistance dust-clearing system of coal boiler. The character is in that: including smoke channel, multi-Venturi tube and circulating reflux combiner, air-in fractate flow equispaced smoke box, dust-clearing machine. The air-in opening of the smoke channel sets equalization-flow and low resistance 90 degree elbow and the air outlet sets equalization-flow and low resistance 180 degree elbow. The multi-Venturi tube and circulating reflux combiner is set between the equalization-flow and low resistance 90 degree elbow and 180 degree elbow. The air outlet of the smoke channel connects to the air-in opening of the fractate flow equispaced smoke box of which the air outlet connects to the air-in opening of the dust-clearing machine. This invention can not only keep the uniformity of the velocity field, but also clear the vortex which can reduce the resistance value 72% and make the system function continually, steadily and reliably with the collection coefficient eta=30-50% and drag loss DeltaP<=150Pa. This invention can be widely used in kinds of coal boiler especially the dust clearance of fuel electric plant.

Description

technical field

[0001] The invention relates to a dust removal system, in particular to a uniform-flow and low-resistance dust removal system for a coal-fired boiler, which is especially suitable for dust removal in thermal power plants. The utility model belongs to the technical field of industrial dust removal equipment. Background technique

[0002] At present, the coal-fired ash produced by coal-fired boilers in power plants is increasing, which significantly increases the concentration of soot entering the dust collector, especially after adopting the circulating fluidized bed flue gas desulfurization process, the concentration of soot before entering the dust collector is as high as 600-1000g / Nm 3 , which greatly exceeds the scope of application of conventional dust collectors. It is necessary to increase the dust removal capacity of the pre-dust collector and reduce the concentration of smoke before entering the dust collector. It is particularly important, but the s...

Examples

specific Embodiment 1

[0028] Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 constitute specific embodiment 1 of the present invention.

[0029] Referring to Fig. 1, the present embodiment includes a flue 1, a multi-venturi tube gas distribution and recirculation material return combiner 2, an upper air inlet knuckle airflow uniform distribution smoke box 3 and a dust collector 4; the air inlet of the flue 1 A 90° sharp elbow 5 with equal flow and low resistance is provided. The air outlet of the flue 1 is equipped with a 180° sharp elbow 6 with equal flow and low resistance. Between the sharp bend 5 of 90° of resistance and the sharp bend 6 of 180° of equal flow and low resistance, the air outlet of the flue 1 is connected to the air inlet of the smoke box 3 of the upper air inlet knuckle, and the air flow of the upper air inlet knuckle is evenly distributed. The air outlet of box 3 is connected with the air inlet of dust collector 4 .

[0030] Referring to Fig. 2, the described sharp elbow 5 with equa...

specific Embodiment 2

[0036] Referring to Fig. 6 and Fig. 7, the characteristic of this specific embodiment 2 is: the dust collector 4 located at the exit of the uniformly distributed airflow smoke box 3 is composed of a ladder groove plate electrostatic precipitator, and the electric precipitator is composed of 2 to 3 rows in a staggered manner. Ladder groove plate 41, discharge electrode 42 and power supply circuit 43 arranged in columns form, the voltage output terminal of power supply circuit 43 connects discharge electrode 42, power supply circuit and grounding end connect ladder groove plate 41, constitute dust collecting pole; 41 and the discharge electrode 42 are arranged as one-to-one pairs to form an electrostatic precipitator unit. All the other are identical with specific embodiment 1.

specific Embodiment 3

[0037] The characteristics of this specific embodiment 3 are: the dust collector 4 is a bag filter, and the rest are the same as the specific example 1.

technical field

[0001] The invention relates to a dust removal system, in particular to a uniform-flow and low-resistance dust removal system for a coal-fired boiler, which is especially suitable for dust removal in thermal power plants. The utility model belongs to the technical field of industrial dust removal equipment. Background technique

[0002] At present, the coal-fired ash produced by coal-fired boilers in power plants is increasing, which significantly increases the concentration of soot entering the dust collector, especially after adopting the circulating fluidized bed flue gas desulfurization process, the concentration of soot before entering the dust collector is as high as 600-1000g / Nm 3 , which greatly exceeds the scope of application of conventional dust collectors. It is necessary to increase the dust removal capacity of the pre-dust collector and reduce the concentration of smoke before entering the dust collector. It is particularly important, but the s...

Examples

specific Embodiment 1

[0028] Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 constitute specific embodiment 1 of the present invention.

[0029] Referring to Fig. 1, the present embodiment includes a flue 1, a multi-venturi tube gas distribution and recirculation material return combiner 2, an upper air inlet knuckle airflow uniform distribution smoke box 3 and a dust collector 4; the air inlet of the flue 1 A 90° sharp elbow 5 with equal flow and low resistance is provided. The air outlet of the flue 1 is equipped with a 180° sharp elbow 6 with equal flow and low resistance. Between the sharp bend 5 of 90° of resistance and the sharp bend 6 of 180° of equal flow and low resistance, the air outlet of the flue 1 is connected to the air inlet of the smoke box 3 of the upper air inlet knuckle, and the air flow of the upper air inlet knuckle is evenly distributed. The air outlet of box 3 is connected with the air inlet of dust collector 4 .

[0030] Referring to Fig. 2, the described sharp elbow 5 with equa...

specific Embodiment 2

[0036] Referring to Fig. 6 and Fig. 7, the characteristic of this specific embodiment 2 is: the dust collector 4 located at the exit of the uniformly distributed airflow smoke box 3 is composed of a ladder groove plate electrostatic precipitator, and the electric precipitator is composed of 2 to 3 rows in a staggered manner. Ladder groove plate 41, discharge electrode 42 and power supply circuit 43 arranged in columns form, the voltage output terminal of power supply circuit 43 connects discharge electrode 42, power supply circuit and grounding end connect ladder groove plate 41, constitute dust collecting pole; 41 and the discharge electrode 42 are arranged as one-to-one pairs to form an electrostatic precipitator unit. All the other are identical with specific embodiment 1.

specific Embodiment 3

[0037] The characteristics of this specific embodiment 3 are: the dust collector 4 is a bag filter, and the rest are the same as the specific example 1.

Images