CN112524391B

CN112524391B - Pulverized coal conveying method with electricity-saving, noise-reducing, low-nitrogen and anti-accumulation functions

Info

Publication number: CN112524391B
Application number: CN202011601713.5A
Authority: CN
Inventors: 王新路; 林立国; 朱振平; 曹磊
Original assignee: Linyi Zhonglian Cement Co ltd
Current assignee: Linyi Zhonglian Cement Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-03-11
Anticipated expiration: 2040-12-30
Also published as: CN112524391A

Abstract

The invention relates to a pulverized coal conveying method with functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation, which comprises the following steps: coal powder in the coal powder bin enters a conveying pipe through a weighing device, one end of the conveying pipe is communicated with a fan, the other end of the conveying pipe is communicated with a decomposing furnace, and the fan blows air to drive the coal powder to enter the decomposing furnace; the conveying pipe is provided with a bent pipe, the conveying pipe at the material incoming end of the bent pipe is provided with an energy collecting device, the energy collecting device comprises a turbine, the outer ring of the bent pipe is communicated with a side blowing pipe, the air inlet end of the side blowing pipe is communicated with smoke discharged by the decomposing furnace, the side blowing pipe is provided with an air blowing device, and the air blowing device comprises a pump wheel; the pulverized coal from the feeding end drives a turbine in the energy collecting device to rotate, the pulverized coal from the feeding end is subjected to energy collection, the energy collecting device drives a pump wheel in the air blowing device to rotate, smoke discharged by the decomposing furnace is blown into the elbow pipe through the pump wheel, and the pulverized coal in the elbow pipe is blown to the discharge direction of the elbow pipe.

Description

Pulverized coal conveying method with electricity-saving, noise-reducing, low-nitrogen and anti-accumulation functions

Technical Field

The invention relates to the technical field of pulverized coal conveying, in particular to a pulverized coal conveying method with functions of electricity saving, noise reduction, low nitrogen and accumulation prevention.

Background

Along with the aggravation of environmental pollution and the increasing shortage of energy sources, people hope to realize energy conservation and emission reduction through a novel combustion mode, in a pulverized coal combustion system, a weighing device is generally adopted to weigh feeding pulverized coal, then pulverized coal discharged from the weighing device is blown into a decomposing furnace through a conveying pipeline through a fan, a Roots fan is generally adopted in the conventional pulverized coal conveying fan, the problems of low working efficiency, low gas production rate, high noise, lubrication, easy pollution, high temperature and the like exist, great harm is easily brought to the environment and the health of workers, meanwhile, the problems of high power consumption and high noise exist in the conventional conveying method, the conveying pipeline cannot avoid an elbow, the pulverized coal is easily accumulated in the conveying pipeline, and the content of nitrogen oxides in smoke generated after the conventional combustion is too high, and serious atmospheric pollution is caused.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation.

The invention is realized by the following technical scheme, and provides a coal powder conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation, which comprises the following steps: coal powder in the coal powder bin enters a conveying pipe through a weighing device, one end of the conveying pipe is communicated with a fan, the other end of the conveying pipe is communicated with a decomposing furnace, and the fan blows air to drive the coal powder to enter the decomposing furnace; the conveying pipe is provided with a bent pipe, the conveying pipe at the material incoming end of the bent pipe is provided with an energy collecting device, the energy collecting device comprises a turbine, the outer ring of the bent pipe is communicated with a side blowing pipe, the air inlet end of the side blowing pipe is communicated with smoke discharged by the decomposing furnace, the side blowing pipe is provided with an air blowing device, and the air blowing device comprises a pump wheel; the pulverized coal from the feeding end drives a turbine in the energy collecting device to rotate, the pulverized coal impact energy from the feeding end is collected, the energy collecting device drives a pump wheel in the air blowing device to rotate, smoke discharged by the decomposing furnace is blown into the elbow pipe through the pump wheel, and the pulverized coal in the elbow pipe is blown to the discharge direction of the elbow pipe.

Because the main resistance in the conveyer pipe comes from the return bend, and the return bend has not been avoided again when the arrangement of conveyer pipe, in this scheme the impact energy through the buggy to the return bend feed end is collected, and turn into the pump impeller rotation among the gas blowing device with the kinetic energy after collecting, drive the flue gas through the pump impeller and blow in the return bend, blow the buggy in the return bend to return bend ejection of compact direction, thereby be convenient for turn to of buggy in the return bend, improve transport efficiency, reduce the friction between buggy and the return bend inner wall of outer lane simultaneously, prevent that the buggy from piling up, the noise reduction, the life of improvement return bend.

Meanwhile, the pulverized coal is subjected to side blowing by the smoke discharged by the decomposing furnace, on one hand, the waste heat in the smoke can be utilized, on the other hand, a part of smoke is returned to the decomposing furnace, the generation of nitrogen oxides can be inhibited, and the pulverized coal is subjected to side blowing by the smoke.

In the prior art, flue gas returns to the decomposing furnace through an independent gas inlet pipeline, and the flue gas and pulverized coal cannot be fully mixed after entering the decomposing furnace, so that a good effect of inhibiting the generation of nitrogen oxides cannot be achieved.

Preferably, the energy collecting device comprises a collecting pipe and a turbine shaft which is connected to the center of the collecting pipe in a shaft mode, a turbine is fixedly connected to the turbine shaft, a turbine driving bevel gear is fixedly connected to the turbine shaft, a turbine output shaft along the radial direction of the collecting pipe is further connected to the collecting pipe in a shaft mode, a turbine driven bevel gear meshed with the turbine driving bevel gear is arranged at one end of the turbine output shaft, and the other end of the turbine output shaft extends out of the collecting pipe and is connected with the input end of the speed increasing box; the blowing device comprises a blowing pipe and a pump wheel shaft which is connected with the center of the blowing pipe in a shaft mode, the pump wheel is fixedly connected to the pump wheel shaft, a pump wheel driven bevel gear is fixedly connected to the pump wheel shaft, the blowing pipe is further connected with a pump wheel input shaft in the shaft mode along the radial direction of the blowing pipe in a shaft mode, one end of the pump wheel input shaft is provided with a pump wheel driving bevel gear meshed with the pump wheel driven bevel gear, and the other end of the pump wheel input shaft extends out of the blowing pipe and is connected with the output end of the speed increasing box.

The buggy in this scheme drives the worm wheel and rotates, and it is rotatory to drive turbine output shaft through the turbine shaft, and it is rotatory that turbine output shaft drives the pump impeller input shaft after through the acceleration rate of speed-increasing box to drive the pump impeller and rotate, can increase the rotational speed of pump impeller through setting up the speed-increasing box, improve the speed that the return bend was insufflated to the flue gas.

Preferably, a turbine front guide cone located at one end, close to the incoming direction, of the turbine shaft is fixedly connected in the collecting pipe, and a pump wheel front guide cone located at one end, close to the air inlet direction, of the pump shaft is fixedly connected in the blowing pipe. The front wind guide cone of the turbine in the scheme plays a guiding role in guiding pulverized coal and airflow blown to the turbine shaft, so that impact and noise on the turbine shaft are reduced, the front wind guide cone of the pump wheel plays a guiding role in guiding the airflow blown to the pump wheel shaft, and impact and noise on the pump wheel shaft are reduced.

Preferably, the air inlet end of the side blowing pipe is also communicated with an air compensation pipe, and the air compensation pipe is provided with an air flow regulating valve. The air compensation pipe in the scheme provides air for the side blowing pipe, and adjusts the air input of the air through the air flow adjusting valve, so that the proportion of flue gas entering the conveying pipe is adjusted.

As optimization, the air inlet proportion of the smoke in the side blowing pipe can be obtained by measuring the temperature in the air compensation pipe, the temperature of the smoke discharged by the decomposing furnace and the temperature of the air outlet end of the side blowing pipe, so that the air flow regulating valve is regulated according to the proportion.

Preferably, the side blowing pipe is parallel to the discharge direction of the bent pipe, and the side blowing pipe is communicated to one end, close to the incoming material direction, of the outer ring of the bent pipe. The ejection of compact direction of side blowpipe and return bend in this scheme is parallel, is convenient for blow the material to ejection of compact direction, and the side blowpipe communicates to the return bend outer lane one end near supplied materials direction simultaneously, makes materials such as buggy just bear the yawing force as soon as getting into the return bend, and the material of being convenient for turns to.

Preferably, the outer ring of the elbow is provided with a plurality of side blowing openings communicated with the side blowing pipe, and the diameter of each side blowing opening is 5-10 mm. The side blow mouth is provided with a plurality of and the diameter of side blow mouth is 5~10mm in this scheme to blow in the return bend through a plurality of less side mouth of a river, be convenient for the mixture of flue gas and buggy.

Preferably, the side blowing pipe is communicated with the outer ring of the bent pipe through a bell mouth. The side-blown pipe communicates through the outer lane of horn mouth with the return bend in this scheme, the mixture of the flue gas of being convenient for and buggy.

Preferably, the conveying pipe is communicated with the upper part of the decomposing furnace through two upper end communicating ports, and the conveying pipe is communicated with the bottom of the decomposing furnace through two lower end communicating ports. The conveyer pipe communicates with the upper portion of the decomposing furnace through two upper end communicating ports in the scheme, and the conveyer pipe communicates with the bottom of the decomposing furnace through two lower end communicating ports, so that pulverized coal is combusted more fully after entering the decomposing furnace, and generation of nitrogen oxides can be effectively reduced.

Preferably, the fan is an air suspension blower. The fan adopts the air suspension air-blower in this scheme, has advantages such as energy-conserving high efficiency, no vibration, low noise.

The invention has the beneficial effects that: the invention relates to a pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation, which collects the impact energy of pulverized coal at the feeding end of an elbow, converts the collected kinetic energy into the rotation of a pump wheel in an air blowing device, drives smoke to blow into the elbow through the pump wheel, blows the pulverized coal in the elbow to the discharge direction of the elbow, thereby facilitating the steering of the pulverized coal in the elbow, improving the conveying efficiency, simultaneously reducing the friction between the pulverized coal and the inner wall of the outer ring of the elbow, preventing the accumulation of the pulverized coal, reducing the noise and prolonging the service life of the elbow, and blows the pulverized coal laterally through the smoke discharged by a decomposing furnace, on one hand, the residual heat in the smoke can be utilized, and on the other hand, the generation of nitrogen oxides can be inhibited by returning part of the smoke to the decomposing furnace.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of an energy harvesting device and an insufflation device of the present invention;

FIG. 3 is a schematic view of the interior of the energy harvesting apparatus of the present invention;

FIG. 4 is a left side view of FIG. 3 in accordance with the present invention;

FIG. 5 is a schematic view of the inside of the blowing device of the present invention;

FIG. 6 is a top view of the present invention as shown in FIG. 5;

shown in the figure:

1. the device comprises a fan, 2, a weighing device, 3, a bent pipe, 4, an energy collecting device, 5, a blowing device, 6, a speed increasing box, 7, a side blowing pipe, 8, a flue gas recovery pipe, 9, an air compensation pipe, 10, an air flow regulating valve, 11, a pulverized coal bin, 12, a corrugated compensator, 41, a collecting pipe, 42, a turbine shaft, 43, a turbine, 44, a turbine driving bevel gear, 45, a turbine gear box, 46, a turbine front wind cone, 47, a turbine rear wind cone, 48, a turbine output shaft, 49, a turbine driven bevel gear, 51, a blowing pipe, 52, a pump shaft, 53, a pump wheel, 54, a pump wheel driven bevel gear, 55, a pump wheel gear box, 56, a pump wheel front wind cone, 57, a pump wheel rear wind cone, 58, a pump wheel input shaft, 59 and a pump wheel driving bevel gear.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

As shown in fig. 1 to 6, the coal powder conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation comprises the following steps: the buggy in the buggy storehouse 11 passes through weighing device 2 and gets into the conveyer pipe, and the one end and the fan 1 intercommunication of conveyer pipe, the other end and the dore furnace intercommunication of conveyer pipe are blown through fan 1 and are driven the buggy and get into the dore furnace, and the conveyer pipe is through two upper end intercommunication mouths and dore furnace upper portion intercommunication, and the conveyer pipe is through two lower extreme intercommunication mouths and dore furnace bottom intercommunication.

The blower 1 adopts an air suspension blower, has the advantages of energy conservation, high efficiency, no vibration, low noise and the like, can save more than 26 percent of electricity on average according to the current running condition, and can save 3.3 ten thousand yuan of electricity per year (the electricity fee is calculated according to 0.57 yuan/degree and the days are calculated according to 300 days) compared with the original Roots blower.

The weighing device 2 is a rotor scale which has the advantages of accurate measurement, environmental protection and the like, and the pulverized coal in the pulverized coal bin 11 enters the rotor scale and is injected into the conveying pipe by the rotor scale according to the required weight.

A flow stabilizing bin is arranged between the pulverized coal bin 11 and the rotor scale, and pulverized coal can be prevented from being accumulated in the pulverized coal bin 11 and being adhered to the wall by the aid of the flow stabilizing bin.

The conveying pipe is provided with a bent pipe 3, the bent pipe 3 is a right-angle bent pipe, the bent pipe is arc-shaped, the outer ring of the bent pipe 3 refers to the outer ring of the bent pipe, and as shown in fig. 1, the outer ring of the bent pipe 3 refers to the position of the upper right corner of the bent pipe.

The conveying pipe is provided with a ripple compensator 12, and the ripple compensator 12 is arranged at the positions of two sides of the rotor scale in the embodiment.

An energy collecting device 4 is arranged on a conveying pipe at the feeding end of the elbow 3, the energy collecting device 4 comprises a turbine 43, the outer ring of the elbow 3 is communicated with a side blowing pipe 7, the air inlet end of the side blowing pipe 7 is communicated with smoke exhausted by the decomposing furnace through a smoke recycling pipe 8, an air blowing device 5 is arranged on the side blowing pipe 7, and the air blowing device 5 comprises a pump wheel 53; the pulverized coal at the feeding end drives the turbine 43 in the energy collecting device 4 to rotate, the impact energy of the pulverized coal at the feeding end is collected, the energy collecting device 4 drives the pump wheel 53 in the blowing device 5 to rotate, the smoke discharged by the decomposing furnace is blown into the elbow 3 through the pump wheel 53, and the pulverized coal in the elbow 3 is blown to the discharging direction of the elbow 3.

The energy collecting device 4 comprises a collecting pipe 41 and a turbine shaft 42 which is connected to the center of the collecting pipe 41 in a shaft mode, wherein the collecting pipe 41 and the conveying pipe are the same in outer diameter and are in butt joint with each other through a flange plate.

Two ends of the turbine shaft 42 are connected with the bearing with the seat in a shaft mode, the bearing with the seat is fixedly connected with the inner wall of the collecting pipe 41 through the connecting rod, the turbine 43 is fixedly connected on the turbine shaft 42, a turbine front air cone 46 located at one end, close to the feeding direction, of the turbine shaft 42 is fixedly connected in the collecting pipe 41, the turbine front air cone 46 is conical, the conical cone tip faces the feeding direction, and the conical bottom surface is larger than the bearing with the seat, so that pulverized coal is prevented from impacting the bearing with the seat and the turbine shaft 42.

A turbine driving bevel gear 44 is fixedly connected to the turbine shaft 42, the turbine driving bevel gear 44 is positioned on one side of the turbine 43 along the conveying direction of the pulverized coal, a turbine output shaft 48 along the radial direction of the collecting pipe 41 is also coupled to the collecting pipe 41, a turbine driven bevel gear 49 meshed with the turbine driving bevel gear 44 is mounted at one end of the turbine output shaft 48, and the other end of the turbine output shaft 48 extends out of the collecting pipe 41 and is connected with the input end of the speed increasing box 6.

The turbine driving bevel gear 44 and the turbine driven bevel gear 49 are mounted inside the turbine gear box 45 to prevent coal dust from being clamped on a gear meshing surface, a turbine rear air guide cone 47 located at one end, close to the material feeding direction, of the turbine gear box 45 is fixedly connected to the turbine shaft 42, the turbine rear air guide cone 47 is located between the turbine 43 and the turbine gear box 45, the turbine rear air guide cone 47 is conical, the conical cone tip faces the material feeding direction, and the conical bottom surface is larger than the turbine gear box 45, so that the coal dust is prevented from impacting the turbine gear box 45 to generate noise.

As shown in fig. 5, the blowing device 5 includes a blowing pipe 51 and a pump axle 52 coupled to the center of the blowing pipe 51, and the blowing pipe 51 has the same outer diameter as the conveying pipe and is coupled to the conveying pipe by a flange.

The two ends of the pump axle 52 are connected with the bearings with the seats through the connecting rod, the bearings with the seats are fixedly connected with the inner wall of the blowing pipe 51 through the connecting rod, the pump wheel 53 is fixedly connected on the pump axle 52, the blowing pipe 51 is fixedly connected with a front pump wheel guide cone 56 which is positioned at one end, close to the air inlet direction, of the pump axle 52, the front pump wheel guide cone 56 is conical, the conical cone tip faces the air inlet direction, and the conical bottom surface is larger than the bearings with the seats, so that the noise and the vibration caused by the fact that air collides with the bearings with the seats and the pump axle 52 are prevented.

A pump driven bevel gear 54 is fixedly connected to the pump shaft 52, the pump driven bevel gear 54 is positioned on one side of the pump 53 along the gas flowing direction, a pump input shaft 58 along the radial direction of the gas blowing pipe 51 is also axially connected to the gas blowing pipe 51, a pump driving bevel gear 59 meshed with the pump driven bevel gear 54 is arranged at one end of the pump input shaft 58, and the other end of the pump input shaft 58 extends out of the gas blowing pipe 51 and is connected with the output end of the speed increasing box 6.

The pump wheel driving bevel gear 59 and the pump wheel driven bevel gear 54 are arranged inside the pump wheel gear box 55 to prevent coal dust from being clamped on a gear meshing surface, the pump wheel shaft 52 is fixedly connected with a pump wheel rear air guide cone 57 which is positioned at one end, close to the incoming wind direction, of the pump wheel gear box 55, the pump wheel rear air guide cone 57 is positioned between the pump wheel 53 and the pump wheel gear box 55, the pump wheel rear air guide cone 57 is conical, the conical cone tip faces the incoming wind direction, and the conical bottom surface is larger than the pump wheel gear box 55, so that the noise generated when gas collides with the pump wheel gear box 55 is prevented.

Because the mass of the pulverized coal is large, the rotating speed of the turbine 43 does not need to be large, the pump wheel 53 needs to drive the gas to flow at a high speed, and therefore the pump wheel 53 is driven to rotate at a high speed through the speed increasing box 6.

The air inlet end of the side blow pipe 7 is also communicated with an air compensation pipe 9, and an air flow regulating valve 10 is arranged on the air compensation pipe 9.

The temperature sensors are arranged at the air outlet ends of the air compensation pipe 9, the smoke recycling pipe 8 and the side blowing pipe 7, the air inlet proportion of smoke in the side blowing pipe 7 can be obtained by measuring the temperature in the air compensation pipe 9, the temperature of smoke discharged by the decomposing furnace and the temperature of the air outlet end of the side blowing pipe 7, and therefore the air flow regulating valve 10 is regulated according to the proportion.

The side blowing pipe 7 is parallel to the discharging direction of the bent pipe 3, and the side blowing pipe 7 is communicated to one end, close to the incoming material direction, of the outer ring of the bent pipe 3.

The outer ring of the elbow pipe 3 is provided with a plurality of side blow openings communicated with the side blow pipe 7, and the diameter of each side blow opening is 5-10 mm.

And the side blow pipe 7 is communicated with the outer ring of the elbow pipe 3 through a bell mouth.

Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be implemented by or using the prior art, and will not be described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present invention and not for limiting the present invention, and the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.

Claims

1. A coal powder conveying method with functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation is characterized by comprising the following steps: coal powder in the coal powder bin (11) enters a conveying pipe through a weighing device (2), one end of the conveying pipe is communicated with a fan (1), the other end of the conveying pipe is communicated with a decomposing furnace, and the fan (1) blows air to drive the coal powder to enter the decomposing furnace;

the energy collecting device is characterized in that a bent pipe (3) is arranged on the conveying pipe, an energy collecting device (4) is arranged on the conveying pipe at the material feeding end of the bent pipe (3), the energy collecting device (4) comprises a turbine (43), the outer ring of the bent pipe (3) is communicated with a side blowing pipe (7), the air inlet end of the side blowing pipe (7) is communicated with smoke exhausted by the decomposing furnace, an air blowing device (5) is arranged on the side blowing pipe (7), and the air blowing device (5) comprises a pump wheel (53);

the pulverized coal from the feeding end drives a turbine (43) in an energy collecting device (4) to rotate, impact energy of the pulverized coal from the feeding end is collected, a pump wheel (53) in an air blowing device (5) is driven to rotate through the energy collecting device (4), smoke discharged by the decomposing furnace is blown into the bent pipe (3) through the pump wheel (53), and the pulverized coal in the bent pipe (3) is blown to the discharging direction of the bent pipe (3).

2. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 1, characterized by comprising the following steps: the energy collecting device (4) comprises a collecting pipe (41) and a turbine shaft (42) which is connected to the center of the collecting pipe (41) in a shaft mode, a turbine (43) is fixedly connected to the turbine shaft (42), a turbine driving bevel gear (44) is fixedly connected to the turbine shaft (42), a turbine output shaft (48) which is arranged along the radial direction of the collecting pipe (41) is further connected to the collecting pipe (41) in a shaft mode, a turbine driven bevel gear (49) which is meshed with the turbine driving bevel gear (44) is installed at one end of the turbine output shaft (48), and the other end of the turbine output shaft (48) extends out of the collecting pipe (41) and is connected with the input end of the speed increasing box (6);

the blowing device (5) comprises a blowing pipe (51) and a pump wheel shaft (52) which is connected with the center of the blowing pipe (51) in a shaft mode, a pump wheel (53) is fixedly connected onto the pump wheel shaft (52), a pump wheel driven bevel gear (54) is fixedly connected onto the pump wheel shaft (52), a pump wheel input shaft (58) which is radial along the blowing pipe (51) is further connected onto the blowing pipe (51) in a shaft mode, a pump wheel driving bevel gear (59) which is meshed with the pump wheel driven bevel gear (54) is installed at one end of the pump wheel input shaft (58), and the other end of the pump wheel input shaft (58) extends out of the blowing pipe (51) and is connected with the output end of the speed increasing box (6).

3. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 2, characterized by comprising the following steps: a turbine front guide cone (46) positioned at one end of the turbine shaft (42) close to the feeding direction is fixedly connected in the collecting pipe (41), and a pump wheel front guide cone (56) positioned at one end of the pump wheel shaft (52) close to the air inlet direction is fixedly connected in the air blowing pipe (51).

4. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to any one of claims 1 to 3, characterized by comprising the following steps: the air inlet end of the side blowing pipe (7) is also communicated with an air compensation pipe (9), and the air compensation pipe (9) is provided with an air flow regulating valve (10).

5. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 4, characterized by comprising the following steps: the air inlet proportion of the flue gas in the side blowing pipe (7) can be obtained by measuring the temperature in the air compensation pipe (9), the temperature of the flue gas discharged by the decomposing furnace and the temperature of the air outlet end of the side blowing pipe (7), so that the air flow regulating valve (10) is regulated according to the proportion.

6. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 1, characterized by comprising the following steps: the side blow pipe (7) is parallel to the discharging direction of the bent pipe (3), and the side blow pipe (7) is communicated to one end, close to the feeding direction, of the outer ring of the bent pipe (3).

7. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 1, characterized by comprising the following steps: the outer ring of the bent pipe (3) is provided with a plurality of side blowing openings communicated with the side blowing pipe (7), and the diameter of each side blowing opening is 5-10 mm.

8. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 1, characterized by comprising the following steps: and the side blow pipe (7) is communicated with the outer ring of the elbow pipe (3) through a bell mouth.

9. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 1, characterized by comprising the following steps: the conveying pipe is communicated with the upper part of the decomposing furnace through two upper end communicating ports, and the conveying pipe is communicated with the bottom of the decomposing furnace through two lower end communicating ports.

10. The pulverized coal conveying method with the functions of saving electricity, reducing noise, lowering nitrogen and preventing accumulation according to claim 1, characterized by comprising the following steps: the fan (1) adopts an air suspension blower.