CN2787303Y - A coal pulverizing device in front of the furnace - Google Patents

Abstract

The utility model relates to a coal powder process device before stove, it includes its characterized in that: an air compressor; the baffle separator is connected with the air compressor through a conveying pipe; the inlet of the coal inlet pipe is connected with an outdoor coal supply device, and the outlet of the coal inlet pipe is connected with the lower part of the conveying pipe; a feeding port of the pulverized coal separator is connected with the baffle separator through a conveying pipe; the inlet of the coal mill is respectively connected with the baffle separator and the coal powder separator through two conveying pipes, and the outlet of the coal mill is connected with the coal powder separator through a conveying pipe; the inlet of the cyclone separator is connected with the pulverized coal separator through a conveying pipe; the inlet of the cloth bag filter is connected with the cyclone separator through a conveying pipe; the inlet of the exhaust fan is connected with the cloth bag filter, and the outlet of the exhaust fan is communicated with the outside; and the intermediate bin is respectively connected with the cyclone separator and the cloth bag filter through two conveying pipes. The utility model has simple structure and low price, and can be widely used for supplying powder in front of various medium and small pulverized coal boilers.

Description

A coal pulverizing device in front of the furnace

technical field

The utility model relates to a coal crushing and processing device, in particular to a small and medium-sized industrial pulverized coal filtering coal furnace pulverizing device.

Background technique

Coal pulverization in the general sense is actually a kind of coal crushing and crushing processing, which belongs to the primary stage of coal pulverization. The processed coal powder has a large particle size, which can only be used for traditional industrial boilers, and cannot meet the needs of high-efficiency industrial pulverized coal boilers. The particle size requirements for fine coal powder; and most of the existing ones are open-type operation, and the dust pollution is relatively serious.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a coal furnace front pulverizing device that realizes full sealing, full negative pressure, no exposure, and no environmental pollution during the processing process, and the pulverizing particle size can reach more than 200 mesh.

In order to achieve the above object, the present invention adopts the following technical solutions: a pulverizing device in front of a coal furnace, which is characterized in that it includes: an air compressor; a baffle separator, which is connected to the air compressor through a delivery pipe; Coal pipe, its inlet is connected to the outdoor coal supply device, its outlet is connected to the lower part of the conveying pipe; a pulverized coal separator, its feed port is connected to the baffle separator through a conveying pipe; a coal grinding A machine whose inlet is respectively connected to the baffle separator and the pulverized coal separator through two delivery pipes, and whose outlet is connected to the pulverized coal separator through a delivery pipe; a cyclone separator whose inlet is connected to the pulverized coal separator through a delivery pipe Connect the pulverized coal separator; a cloth bag filter, whose inlet is connected to the cyclone separator through a conveying pipe; an exhaust fan, whose inlet is connected to the cloth bag filter, and whose outlet leads to the outdoor; The silo is respectively connected to the cyclone separator and the bag filter through two conveying pipes.

The baffle separator includes a sealed cylinder, the top of the cylinder is provided with an exhaust port connected to the pulverized coal separator, the bottom of the cylinder is an inclined surface, and at the bottom of the inclined surface A return port connected to the coal mill is provided, a through hole is provided in the center of the inclined surface, the conveying pipe connected to the air compressor penetrates through the through hole, and is located in the middle of the cylinder body. A baffle plate is arranged obliquely above the conveying pipe.

The pulverized coal separator includes a sealed cylinder, and the side of the cylinder is at least provided with a feed pipe connected to the baffle separator and a return pipe connected to the outlet of the coal mill. The bottom of the cylinder is conical, and a return port connected to the inlet of the coal mill is provided at the bottom, and an exhaust port connected to the cyclone separator is provided near the top of the cylinder, and the top of the cylinder is in the middle A speed-regulating motor is provided, and the speed-regulating motor is connected with an impeller disc, and the impeller disc is located at the upper part of the barrel.

The coal mill includes a motor-driven screw feeding device and a three-stage hammer plus a first-stage fan, the outlet of the coal mill is the air outlet of the fan, and the screw feeding device includes a transverse guide A feeding pipe, a three-headed feeding screw connected to the motor is arranged in the feeding pipe, a sealed feeding hopper is vertically arranged in the middle of the feeding pipe, and two inlets are arranged on the top of the feeding hopper.

The intermediate silo is a tapered sealed cylinder with two feeding ports on the top of the cylinder and a pulverized coal outlet on the bottom of the cylinder.

The bag filter includes a box, and several filter bags are arranged in the box, and metal wires are wound on the outer surface of the filter bags. After the metal wires are collected, they pass through one side of the box and are grounded. , One side of the box is provided with a heavy hammer explosion-proof door.

Due to the adoption of the above technical scheme, the utility model has the following advantages: 1. The utility model performs primary separation of raw coal through a baffle separator, and secondary separation through a pulverized coal separator. After the selected coarse coal powder is pulverized by the coal mill, it is returned to the coal powder sorter to continue the secondary separation, so that the particle size of the coal powder entering the intermediate silo can reach more than 200 mesh, which can completely reach the size of the coal powder. The requirements of fine processing meet the powder supply needs of high-efficiency industrial pulverized coal boilers. 2. The conveying pipes are used to connect the various devices of the utility model, so that the pulverized coal is transported in a fully sealed environment during the entire processing process, which not only enables the entire pulverized supply system to be conveyed by pneumatic force, but also realizes that the pulverized coal is not exposed The purpose of the invention is to pollute the environment. 3. In the baffle separator, the device of this utility model utilizes the impact of the obliquely arranged baffle plate and the coal ejected from the obliquely opened conveying pipe, so that the coarse coal particles fall into the coal mill under its own weight, and the suspended The fine pulverized coal is transported to the pulverized coal separator under the action of the air flow, and the centrifugal action of the rotating impeller disc is used in the pulverized coal separator to make the coarse coal particles in the pulverized coal fall into the coal pulverizer under its own weight. , the suspended fine pulverized coal is transported to the cyclone separator under the action of the airflow, so that the separation of fine coal powder is realized, and the separation effect is particularly good. 4. The coal mill in the device of this utility model adopts a three-stage hammer for grinding ore and a one-stage fan device, which can not only ensure the processing effect of the pulverized coal, but also send the processed coal powder back through the power of the fan. Coal pulverized separator; at the same time, the feeding system of the coal mill adopts a single-head screw, especially a three-head screw, which not only has a fast feeding speed, but also is not easy to be blocked. 5. The cloth bag filter in the present invention is safe and reliable to use because it is provided with an antistatic ground wire and an explosion-proof explosion-proof door. The utility model has the advantages of simple structure, reasonable and compact configuration among various devices, small space occupation, flexible and convenient operation, and can be widely used for powder supply in front of various small and medium pulverized coal boilers.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the baffle separator of the present invention.

Fig. 3 is a structural schematic diagram of the utility model pulverized coal separator.

Fig. 4 is a structural schematic diagram of the impeller disk of the coal powder separator of the utility model.

Fig. 5 is a structural schematic diagram of the bag filter of the present invention.

Detailed ways

In order to describe the structure and features of the present utility model in detail, the following preferred embodiments are given and illustrated with accompanying drawings.

As shown in Figure 1, the utility model includes an air compressor 1, a baffle separator 2, a coal delivery pipe 3, a pulverized coal separator 4, a coal mill 5, a cyclone separator 6, a bag filter 7, and an exhaust fan 8 and intermediate silo 9.

The outlet of the air compressor 1 is connected to the baffle separator 2 through a conveying pipe 11, the outlet of the coal inlet pipe 3 is connected to the lower part of the conveying pipe 11 near the air compressor 1, and the inlet of the coal inlet pipe 3 is connected to an outdoor coal supply device. The exhaust port of the baffle separator 2 is connected to the pulverized coal separator 4 through the delivery pipe 12, and the return port of the baffle separator 2 is connected to the feed hopper 56 of the coal mill 5 through the delivery pipe 13, and the The feed hopper 56 is also connected to the feed return port of the pulverized coal separator 4 through the conveying pipe 14 , and the outlet of the coal mill 5 is connected to the inside of the pulverized coal separator 4 through the conveying pipe 15 . The exhaust port of the pulverized coal separator 4 is connected to the inlet of the cyclone separator 6 through the conveying pipe 16, the exhaust port of the cyclone separator 6 is connected to the bag filter 7 through the conveying pipe 17, and the air outlet of the bag filter 7 is connected to the exhaust fan 8. The exhaust fan 8 can exhaust air to the outside through the pipeline. The bottom return ports of the cyclone separator 6 and the bag filter 7 are respectively connected to the intermediate silo 9 through the conveying pipes 18 and 19. The intermediate silo 9 is a conical sealed cylinder. The pulverized coal outlet 91 that the coal device is connected to.

In the above embodiment, as shown in Figure 2, the baffle separator 2 includes a sealed cylinder 21, the top of the cylinder 21 is provided with an exhaust port 22, the bottom of the cylinder 21 is an inclined surface 23, and the lowest part of the inclined surface is provided The material return port 24 is provided with a through hole in the middle of the inclined surface 23, the conveying pipe 11 penetrates the through hole, and is located in the middle of the cylinder 21, and a baffle plate 25 is arranged obliquely above the outlet of the conveying pipe 11, and the baffle plate can be supported by The ribs 26 are supported on the delivery pipe 11 . The outlet of the conveying pipe 11 can also be set to be inclined, and its inclination direction can be the same as that of the baffle plate 25 , that is, the coal ejected from the conveying pipe 11 is vertically aligned with the baffle plate 25 .

In the above-mentioned embodiment, as shown in Fig. 3 and Fig. 4, the pulverized coal separator 4 includes a sealed cylinder 41, the top of which is arched, and an exhaust port 42 is arranged on it, and the top of the cylinder 41 is set in the middle A speed-regulating motor 43 , the output end of which is connected to an impeller disc 44 . Blades 45 are arranged radially on the impeller disc 44 . The bottom of the cylinder 41 is conical, and at the bottom of the cone there is a return port 49 connected to the coal mill 5, and a feed pipe 46 is provided on the side wall of the cylinder 41, and the outlet of the feed pipe 46 is upward. The delivery pipe 14 is connected at the inlet of the feed pipe 46 . A return pipe 47 is also arranged on the side wall of the cylinder 41 , the outlet of the return pipe 47 is also upward, and the delivery pipe 15 is connected to the inlet of the return pipe 47 . The feed pipe 46 and the return pipe 47 can be arranged on one side (as shown in FIG. 1 ), also can be separately arranged on both sides (as shown in FIG. 3 ), and can even be integrated into one after entering the cylinder 41 . A rotating tuyere 48 can also be set on the side wall of the cylinder 41 to send in the separation that rotates along the cylinder wall to increase the separation effect.

In the above embodiment, as shown in Figure 1, the coal mill 5 includes a screw feeding device 52 driven by a motor 51 and a three-stage pulverizing hammer plus a one-stage fan 53 device, and a three-stage pulverizing hammer plus a one-stage fan device belongs to Generally, the common structure of the heavy hammer type ore coal mill, the outlet of the coal mill 5 is the air outlet 53 of the fan, which is connected to the return port 47 of the pulverized coal separator through the conveying pipe 15 . The screw feeding device 52 comprises a horizontal feed pipe 54, a single-head or three-head feed screw 55 connected to the motor 51 is arranged in the feed pipe 54, and a sealed feed hopper 56 is vertically arranged in the middle of the feed pipe 54 to feed The top of the hopper 56 is provided with a parallel or two inlets to connect the return ports 24, 49 of the baffle separator 2 and the pulverized coal separator 4 through the delivery pipes 13, 14 respectively.

In the above-mentioned embodiment, as shown in Figure 5, the bag filter 7 includes a box body 71 and several filter bags 72 arranged in the box body 71, and metal wires 73 are wound on the filter bags 72, and each metal wire 73 is brought together Pass out from one side of the box body 71 and ground 74, which can play an anti-static role. One side of the box body 71 of the bag filter 7 can be provided with a heavy hammer type explosion-proof door 75 . The explosion-proof door 75 can also take other structural modes. The inlet 76 of the bag filter 7 is connected to the exhaust port of the cyclone separator 6 through the delivery pipe 17, the outlet 77 of the bag filter 7 is connected to the outdoor exhaust fan 8 through a pipeline, and the return port 78 of the bag filter 7 passes through the delivery pipe 19 Connect the intermediate silo 9.

In the above-mentioned embodiment, the air compressor 1, the cyclone separator 6 and the exhaust fan 8 can be purchased as ready-made products, which will not be repeated here. In addition, the specific structures of the above-mentioned devices can be changed.

When the utility model is in operation, as shown in Figure 1, start the air compressor 1, deliver high-pressure air to the system, and open the feed pipe 3 at the same time, and the coal material will enter the baffle separator under the negative pressure drainage in the delivery pipe 11 2. In the baffle separator 2, the coal material ejected from the conveying pipe 11 first encounters the obstruction of the inclined material baffle plate 26, and the coarse particles in the coal material will fall under their own gravity and flow along the barrel 21. The inclined surface 23 at the bottom and the conveying pipe 13 flow into the feed hopper 56 of the coal mill 5 to continue grinding; while the fine powder in the coal entering the baffle separator 2 will enter from the conveying pipe 12 along with the air pressure in the system. Pulverized coal separator4. In the pulverized coal separator 4, the pulverized coal entering from the feed pipe 46 is blocked by the rotating impeller disc 47 and is swirled up, and the fine powder rises through the conveying pipe connected to the exhaust port 42 under the action of air pressure 16 enters the cyclone separator 6, and under the action of gravity, the coarse particles return to the coal mill 5 through the conveying pipe 14 of the return port 49 to continue grinding, and the fine powder after the three-stage heavy hammer grinding is again discharged under the action of the fan. Be sent back to pulverized coal separator 4. The pulverized coal that enters the cyclone separator 6 is fine pulverized coal that meets the requirements. After the pulverized coal is separated from the air, the gas is discharged into the bag filter 7 through the delivery pipe 17, and the pulverized coal enters the intermediate silo 9 through the delivery pipe 18. . The gas entering the bag filter 7 is further filtered and separated, and the pulverized coal is sent back to the intermediate storage bin 9 through the delivery pipe 19 . The air discharged from the bag filter 7 by the exhaust fan 8 has fully reached the discharge standard, and will not pollute the environment, and can be directly discharged outdoors. The pulverized coal outlet 91 connected with the coal device of the pulverized coal boiler system can be opened or closed as required, and can also keep a small flow for continuous feeding.

Claims (10)

1. A pulverizing device in front of a coal furnace, characterized in that it comprises: an air compressor; A baffle separator, which is connected to the air compressor through a delivery pipe; A coal inlet pipe, the inlet of which is connected to the outdoor coal supply device, and the outlet of which is connected to the lower part of the conveying pipe; A pulverized coal separator, the feed port of which is connected to the baffle separator through a conveying pipe; A coal mill, the inlet of which is respectively connected to the baffle separator and the pulverized coal separator through two conveying pipes, and the outlet of which is connected to the pulverized coal separator through a conveying pipe; A cyclone separator, the inlet of which is connected to the pulverized coal separator through a delivery pipe; A cloth bag filter, the inlet of which is connected to the cyclone separator through a delivery pipe; A row of fans, the inlet of which is connected to the bag filter, and the outlet of which leads to the outside; An intermediate silo is connected to the cyclone separator and the bag filter respectively through two delivery pipes. 2. A coal furnace front pulverizing device according to claim 1, characterized in that: the baffle separator includes a sealed cylinder, and the top of the cylinder is provided with a plug connected to the coal powder separator. The exhaust port, the bottom of the cylinder is an inclined surface, and a return port connected to the coal mill is arranged at the bottom of the inclined surface, and a through hole is arranged in the center of the inclined surface, connected to the empty The conveying pipe of the press passes through the through hole and is located in the middle of the cylinder, and a material baffle plate is obliquely arranged above the conveying pipe. 3. A coal pulverizing device in front of a furnace according to claim 1, characterized in that the pulverized coal separator includes a sealed cylinder, and the side of the cylinder is provided with at least one connecting plate The feed pipe of the separator and a return pipe connected to the outlet of the coal mill, the bottom of the cylinder is conical, and a return port connected to the inlet of the coal mill is arranged at the bottom, the cylinder An exhaust port connected to the cyclone separator is provided near the top of the cylinder, and a speed-regulating motor is arranged in the middle of the top of the cylinder, and the speed-regulating motor is connected to an impeller disk, and the impeller disk is located on the upper part of the cylinder. 4. A coal pulverizing device in front of a furnace according to claim 2, wherein the pulverized coal separator includes a sealed cylinder, and at least one side of the cylinder is provided with a connecting plate The feed pipe of the separator and a return pipe connected to the outlet of the coal mill, the bottom of the cylinder is conical, and a return port connected to the inlet of the coal mill is arranged at the bottom, the cylinder An exhaust port connected to the cyclone separator is provided near the top of the cylinder, and a speed-regulating motor is arranged in the middle of the top of the cylinder, and the speed-regulating motor is connected to an impeller disk, and the impeller disk is located on the upper part of the cylinder. 5. A coal pulverizing device in front of a furnace as claimed in claim 1, 2, 3 or 4, characterized in that the coal mill includes a motor-driven screw feeding device, three-stage hammer plus one-stage fan , the outlet of the coal mill is the air exhaust port of the fan, the screw feeding device includes a horizontal feed pipe, and a three-head feed screw connected to the motor is arranged in the feed pipe, the A sealed feed hopper is arranged vertically in the middle of the feed pipe, and two inlets are arranged on the top of the feed hopper. 6. The pulverizing device in front of the coal furnace according to claim 1, 2, 3 or 4, characterized in that: the intermediate silo is a conical sealed cylinder, and the top of the cylinder is provided with two feeding ports, A pulverized coal outlet is provided at the bottom of the cylinder. 7. The pulverizing device in front of the coal furnace as claimed in claim 5, characterized in that: the intermediate silo is a conical sealed cylinder, the top of the cylinder is provided with two feeding ports, and the bottom of the cylinder is provided with One for pulverized coal export. 8. The pulverizing device in front of the coal furnace according to claim 1, 2, 3 or 4, characterized in that: the bag filter includes a box, and several filter bags are arranged in the box, and the filter bags The outer surface of the box is wound with metal wires. After the metal wires are collected, they pass through one side of the box and are grounded. One side of the box is provided with a heavy hammer type explosion-proof door. 9. The pulverizing device in front of the coal furnace according to claim 5, characterized in that: the bag filter comprises a box, and several filter bags are arranged in the box, and the outer surface of the filter bags is wound There are metal wires. After the metal wires are collected, they pass through one side of the box and are grounded. One side of the box is provided with a heavy hammer type explosion-proof door. 10. The pulverizing device in front of the coal furnace according to claim 6, characterized in that: the bag filter includes a box, and several filter bags are arranged in the box, and the outer surface of the filter bags is wound There are metal wires. After the metal wires are collected, they pass through one side of the box and are grounded. One side of the box is provided with a heavy hammer type explosion-proof door.

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