CN-119387017-B - A mixing wind device that is used for milling return air system's mixing wind, spark to catch

CN119387017BCN 119387017 BCN119387017 BCN 119387017BCN-119387017-B

Abstract

A wind mixing device for mixing wind and catching sparks of a powder grinding and air returning system comprises a wind mixing column outer cylinder, a wind outlet inner cylinder positioned in the wind mixing column outer cylinder, a cyclone wind channel arranged between the inner wall of the wind mixing column outer cylinder and the outer wall of the wind outlet inner cylinder, a spiral downward pressing top plate arranged at the top of the cyclone wind channel, a cyclone dust separation chute arranged on the inner wall of the cyclone wind channel in a spiral manner, a cone barrel ash bucket arranged at the bottom of the wind mixing column outer cylinder, and a 'two-inlet three-outlet' wind mixing system. The air sources of the invention are from partial residual temperature return air after dust removal of the grinding system and low-temperature flue gas of other systems, so that energy conservation and emission reduction are realized, waste heat recovery and reutilization are realized, the energy consumption of a hot blast stove heat source is reduced, meanwhile, both air sources have low-oxygen conditions, low-oxygen operation conditions are provided for the grinding system after air mixing, and the oxygen content of the grinding system is controlled below 12%.

Inventors

KONG JINSHAN
WANG JUNHUI
XIAO WEI
SHAO YONGQIANG
CHU ZHICHANG
DING CHENGKUN
WU FUDE
PING ZHIMING
LIU XIANFENG
LI GANGGANG

Assignees

黎明重工股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (5)

1. The air mixing device for mixing air and capturing sparks of a powder grinding and air returning system is characterized by comprising an air mixing column outer cylinder (12) and an air outlet inner cylinder (8) positioned in the air mixing column outer cylinder (12), wherein a cyclone air duct (13) is arranged between the inner wall of the air mixing column outer cylinder (12) and the outer wall of the air outlet inner cylinder (8), a spiral down-pressing top plate (11) is arranged at the top of the cyclone air duct (13), the top of the cyclone air duct (13) is positioned in a closed space by the spiral down-pressing top plate (11), a cyclone dust separation chute (2) is spirally arranged on the inner wall of the cyclone air duct (13), and a cone ash bucket (10) is arranged at the bottom of the air mixing column outer cylinder (12); the system also comprises a 'two-inlet three-outlet' air mixing system, wherein the first air inlet part is a low-temperature flue gas air inlet duct (4), the second air inlet part is a high Wen Huifeng air inlet duct (5), the low-temperature flue gas air inlet duct (4) and the high-temperature return air inlet duct (5) are both communicated with a cyclone air duct (13), a first dust exhaust port (1) is arranged at the tail end of the cyclone dust separation chute (2), a second dust exhaust port (14) is arranged at the bottom of the cone-shaped ash bucket (10), and a first air outlet (15) is arranged at the upper end of the air outlet inner barrel (8); The high-temperature return air inlet duct (5) is a rectangular pipeline, and the rectangular pipeline is positioned in the tangential air inlet direction of the air mixing column outer cylinder (12); The low-temperature flue gas air inlet duct (4) is a cylindrical pipeline, a plurality of cyclone blades (4.1) are arranged in the cylindrical pipeline, the tail ends of the cyclone blades (4.1) are flue gas outer cone barrels (4.2) for enlarging space, the center of an air outlet of each flue gas outer cone barrel (4.2) is a flue gas inner cone barrel (4.3), the bottom of each flue gas inner cone barrel (4.3) is a flue gas dust outlet (4.4), and the flue gas dust outlet (4.4) is communicated with the cyclone dust separation chute (2); The air outlet inner cylinder (8) is a cylindrical pipeline and is concentric with the air mixing column outer cylinder (12), and the bottom end plane of the air outlet inner cylinder (8) is higher than the bottom end plane of the air mixing column outer cylinder (12); The cross section of the cyclone dust separating chute (2) is L-shaped, the vertical edge is close to the axial center of the air mixing column outer cylinder (12), and the L-shaped cyclone dust separating chute and the inner wall of the air mixing column outer cylinder (12) form an open U-shaped chute; The first dust discharge port (1) adopts a pulse venturi, the dust discharge port of the pulse venturi is positioned at the tail end of the cyclone dust separation chute (2), the opening U-shaped chute is changed into a closed rectangular shrinkage port, and a pulse jetting pipe is arranged in the center of the cross section of the shrinkage port.
2. A mixing device for mixing air and catching sparks in a mill return air system according to claim 1, wherein the spiral line of the cyclone dust separating chute (2) is consistent with the pitch and diameter of the spiral down-pressing top plate (11).
3. A mixing device for mixing air and catching sparks for a mill return air system according to claim 1 is characterized in that a pulse valve interface (3) is arranged at a closed rectangular constriction.
4. A mixing device for mixing air and capturing sparks for a mill return air system according to claim 1, wherein a pressure transmitter (6) and a temperature transmitter interface (7) are arranged in a high Wen Huifeng air inlet duct (5), and a pressure transmitter (6) and a temperature transmitter interface (7) are arranged in an air outlet inner cylinder (8).
5. A mixing device for mixing air and catching sparks in a mill return air system according to claim 1, wherein a vortex cover (9) is arranged in a cone bucket ash bucket (10), and the vortex cover (9) is positioned above a second dust discharge port (14).

Description

A mixing wind device that is used for milling return air system's mixing wind, spark to catch Technical Field The invention relates to a closed-loop and semi-closed-loop wind mixing system for grinding powder, which is connected with a device for mixing wind and eliminating sparks between a hot blast stove and a mill. Background At present, a drying heat source of a pulverizer comes from various modes such as a hot blast stove, an exhaust gas and flue gas system, steam and flue gas heat exchange, pure gas heat exchange and the like, and particularly when flammable and explosive solid minerals are used on two sides of the pulverizer and the hot blast stove, a Mars catcher needs to be additionally arranged between the hot blast stove and the pulverizer, but adverse factors such as falling and breakage of a filter bag of the dust catcher, unstable combustion and deflagration of the hot blast stove cannot be avoided, so that a large amount of solid fuel Mars in a return air pipeline enter the pulverizer to cause combustion and explosion risks of solid combustibles in the pulverizer. The trap has single action on the return air pipeline, only catches sparks in the return air pipeline, and has no actions of mixing air smoke and dust fall on return air dust. The air mixing cylinder mixes the flue gas with the return air high-temperature gas, stably controls the air temperature entering the mill, and has no dust removal and spark catching effects. The purpose of mixing the flue gas is to reduce the oxygen content of the flue gas entering the mill, utilize the flue gas waste heat for drying, raise the temperature of the flue gas, and avoid the sulfur-containing flue gas from condensation corrosion pipelines at each mixing position of the mill, and the flue gas is subjected to centralized treatment of desulfurization and denitration. Disclosure of Invention The invention aims to provide a device for uniformly mixing air, stably controlling temperature, removing dust and falling dust, capturing sparks and heating flue gas to avoid dew corrosion containing sulfur, and provides a multipurpose air mixing device between a hot blast stove and a mill. The technical scheme of the invention is as follows: the air mixing device comprises an air mixing column outer cylinder and an air outlet inner cylinder positioned in the air mixing column outer cylinder, wherein a cyclone air channel is arranged between the inner wall of the air mixing column outer cylinder and the outer wall of the air outlet inner cylinder, and the top of the cyclone air channel is provided with a spiral down-pressing top plate which enables the top of the cyclone air channel to be in a closed space; the cyclone dust separating chute is characterized by further comprising a 'two-inlet three-outlet' air mixing system, wherein the first air inlet part is a low-temperature flue gas air inlet duct, the second air inlet part is a high Wen Huifeng air inlet duct, the low-temperature flue gas air inlet duct and the high-temperature return air inlet duct are both communicated with the cyclone air duct, a first dust discharging port is arranged at the tail end of the cyclone dust separating chute, a second dust discharging port is arranged at the bottom of the cone-barrel ash bucket, and a first air outlet is arranged at the upper end of the air outlet inner barrel. The high-temperature return air inlet duct is a rectangular pipeline, and the rectangular pipeline is positioned in the tangential air inlet direction of the outer cylinder of the air mixing column. The low-temperature flue gas air inlet duct is a cylindrical pipeline, a plurality of cyclone blades are arranged in the cylindrical pipeline, the tail ends of the cyclone blades are flue gas outer cone barrels for enlarging the space, the center of an air outlet of each flue gas outer cone barrel is a flue gas inner cone barrel, the bottom of each flue gas inner cone barrel is a flue gas dust outlet, and the flue gas dust outlet is communicated with the cyclone dust separation chute. The air outlet inner cylinder is a cylindrical pipeline and is concentric with the air mixing column outer cylinder, and the bottom end plane of the air outlet inner cylinder is higher than the bottom end plane of the air mixing column outer cylinder. The section of the cyclone dust separating chute is L-shaped, the vertical edge is close to the axial center of the outer cylinder of the air mixing column, and the L-shaped cyclone dust separating chute and the inner wall of the outer cylinder of the air mixing column form an open U-shaped chute. The spiral line of the cyclone dust separation chute is consistent with the pitch and the diameter of the spiral pressing top plate. The first dust discharge port adopts a pulse venturi, the pulse venturi dust discharge port is positioned at the tail end of the cyclone dust separation chute, the open U-shaped chute is changed into a closed rectangular shrinkage port, and the center of th