CN110631378A

CN110631378A - Vertical preheater

Info

Publication number: CN110631378A
Application number: CN201911115867.0A
Authority: CN
Inventors: 常彦鑫; 霍磊; 刘敏; 王浩; 黄宝; 刘晓渊
Original assignee: JINDIAN CHEMICAL INDUSTRY Co Ltd PIANGUAN COUNTY
Current assignee: JINDIAN CHEMICAL INDUSTRY Co Ltd PIANGUAN COUNTY
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2019-12-31

Abstract

The invention relates to a heat exchanger device, in particular to a vertical preheater for a rotary kiln tail. The invention comprises a shell, a preheating bin, a hopper, a blanking device, a discharge pipe, a smoke bin and a smoke cone, and is characterized in that the bin is a ventilating bin, the lower part of the bin is connected with the hopper, the lower part of the hopper is provided with a discharge valve, the lower part of the discharge valve is provided with the blanking device, the discharge hole of the blanking device is connected with the discharge pipe extending into the feed end of a rotary kiln, pellets enter the bin from an inlet and enter the hopper after heat exchange with high-temperature smoke, and enter the rotary kiln through the discharge pipe through the blanking device; the flue gas enters the smoke bin from the front end of the feed inlet of the rotary kiln, then enters the flue gas cone, and then enters the preheating bin to exchange heat with the pellets in the bin. According to the invention, the high-temperature flue gas generated by the rotary kiln is utilized to heat the metallurgical pellet materials, so that the calcining temperature in the rotary kiln is increased, the flue gas temperature is effectively reduced, the bag-type dust collector can effectively play a role for a long time, and the effects of energy conservation, emission reduction and waste heat utilization are achieved.

Description

Vertical preheater

Technical Field

The invention relates to a heat exchanger device, in particular to a vertical preheater for a rotary kiln tail.

Background

The rotary kiln refers to a rotary calcining kiln (commonly called a rotary kiln). In recent years, with the implementation of national environmental protection policies and resource use policies, the rotary kiln gradually replaces an earth kiln and a shaft kiln which have backward facilities, large pollution and high energy consumption. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the different materials to be treated. The rotary kiln described herein is a metallurgical chemical kiln.

During the process of calcining metallurgical pellet materials in a rotary kiln, a large amount of high-temperature flue gas is generated, the temperature of the flue gas at the tail of the kiln can reach 300-450 ℃, the existing high-temperature dust removal cloth bag is required to be used below 260 ℃ for a long time, the instantaneous temperature resistance is 280 ℃, and the high-temperature flue gas which is not processed can not be directly matched with a cloth bag dust remover for use. The conventional method is to add an air cooler and reduce the temperature of the flue gas to below 220 ℃. Because the air cooler requires large heat dissipation area, the floor area of the air cooler is 250 square meters, the steel consumption is 300 tons, and the total manufacturing cost is about 350 ten thousand.

Disclosure of Invention

The invention aims to provide a vertical preheater capable of saving energy, reducing emission and utilizing waste heat.

A vertical preheater comprises a shell, a preheating bin, a hopper, a blanking device, a discharging pipe, a smoke bin, a smoke cone hopper and a smoke pipeline, and is characterized in that a feeding hole is formed in the top of the shell, a material separating cone and a material blocking ring are mounted on the upper portion of the preheating bin, the material separating cone is connected with the bin below the material separating cone, the bin is a breathable bin, the hopper is connected to the lower portion of the bin, a discharging valve is mounted on the lower portion of the hopper, the blanking device is mounted on the lower portion of the discharging valve, the discharging pipe extending into the feeding end of a rotary kiln is connected to the discharging hole of the blanking device, pellets enter the preheating bin from an inlet and enter the rotary kiln under the action of the material separating cone hopper and the material blocking ring, and after heat exchange, the; the lower part of the preheating bin is provided with a smoke conical hopper, a straight section at the lower part of the conical hopper penetrates through the middle of the blanking device to be connected with the smoke bin, the lower part of the smoke bin is connected with a smoke outlet at the front end of a feed inlet of the rotary kiln, a smoke pipeline is arranged on the outer ring of the preheating bin to be communicated with a smoke channel in the preheating bin, smoke enters the smoke bin from the front end of the feed inlet of the rotary kiln, then enters the smoke conical hopper, enters the preheating bin to exchange heat with pellets in the bin, is reduced to below 200 ℃ and is sucked into a bag-type dust collector through the smoke pipeline, and after.

The feed bin in foretell preheating bin includes skeleton side pipe, bottom sprag side pipe, net steel sheet, and two skeleton side pipe link together and constitute a set ofly, fix on bottom sprag side pipe, and a plurality of group skeleton side pipe enclose into the round, and the net steel sheet is installed respectively on skeleton side pipe, and the net steel sheet chooses for use that heat resistance is good, the special material of net shape, and inside and outside respectively sets up the one deck, forms the annular feed bin of circle.

The feed bin in the preheating bin further comprises 8 partition plates, and the partition plates are fixed between the two framework square tubes and divide the feed bin into 8 chambers.

Every indoor 2 corrosion resistant wear-resisting thermal resistance of all installing of foretell feed bin, the inside temperature of real time monitoring feed bin, according to the unloading valve of monitoring temperature switch hopper bottom to rationally unload.

The framework square pipe and the bottom supporting square pipe of the storage bin are communicated to form an air cooling pipeline.

The air cooling valves are mounted at the outer ends of the bottom supporting square tubes of the storage bin, the negative pressure formed by the bag-type dust collector is utilized, the opening degree of the air cooling valves is adjusted according to the monitored temperature, and the air volume is controlled, so that the working temperature of the storage bin is effectively controlled.

The number of the hoppers is 16, and the hoppers are arranged below the storage bin. The bottom of the hopper is provided with a discharge valve.

The blanking device is provided with a scraping plate, a rotary material tray, a rotary support and a speed reduction motor driving device, wherein the scraping plate is fixed on an equipment support through a connecting plate, the rotary material tray is fixed at the top of an outer ring of the rotary support through a steel beam, the bottom of an inner ring of the rotary support is fixed on a concrete beam plate, the speed reduction motor driving device of the blanking device drives a large gear of the outer ring of the rotary support to rotate through a small gear transmission, so that the rotary material tray and metallurgical pellet materials falling on the rotary material tray are driven to rotate around the center, and the scraping plate scrapes the metallurgical pellet materials into a discharging.

An ash hopper and an ash discharge valve are arranged below the tobacco bin, so that dust is prevented from entering the rotary kiln, and collected dust is conveyed to the raw material workshop pneumatically to participate in batching again.

20 dust removal valves are uniformly distributed below the shell, and the valves are switched on and off at regular time according to production and equipment running conditions, and the dust falling into the bottom of the shell is absorbed by using negative pressure formed by the bag-type dust remover.

An access door is arranged in the middle of the preheating bin.

The inner side of the shell is provided with a refractory material.

Compared with the prior art, the invention has the following advantages:

the invention utilizes the high-temperature flue gas generated by the rotary kiln calcination to dry and heat the metallurgical pellet materials, is beneficial to improving the calcination temperature in the rotary kiln, and effectively reduces the temperature of the flue gas discharged by the rotary kiln calcination to be below 200 ℃, so that the bag-type dust collector can effectively play a role for a long time, plays a role in energy conservation and emission reduction and waste heat utilization, and reduces the equipment maintenance cost. The steel consumption of the invention is only 85 tons, the horizontal floor area is only 135 square meters, and the construction cost is greatly reduced.

Drawings

The invention is further illustrated with reference to the following figures and examples.

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

FIG. 2 is a schematic view of a flue gas duct of the present invention;

FIG. 3 is a schematic view of a hopper of the present invention;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a schematic perspective view of a storage bin of the present invention;

FIG. 6 is a top view of the bin of the present invention

FIG. 7 is a schematic perspective view of a blanking device according to the present invention;

fig. 8 is a plan view of the blanking apparatus of the present invention.

In the figure: 1 is metallurgical pelletizing material, 2 is separating material cone, 3 is the material stopping ring, 4 is preheating the storehouse, 5 is flue gas pipeline, 6 is the casing, 7 is the feed bin, 8 is flue gas cone fill, 9 is the hopper, 10 is unloader, 11 is the discharging pipe, 12 is the tobacco storehouse, 13 is the rotary kiln, 14 is the access door, 15 is corrosion-resistant wear-resisting thermal resistance, 16 is the dust removal valve, 17 is the air-cooled valve, 18 is the ash bucket, 19 is the unloading valve, 71 is skeleton side pipe, 72 is bottom sprag side pipe, 73 is the net steel sheet, 74 is the division board, 91 is the unloading valve, 101 is scraping plate, 102 is the rotating charging tray, 103 is slewing bearing, 104 is gear motor drive arrangement.

Detailed Description

As shown in the figure, the vertical preheater comprises a shell 6, a preheating bin 4, a stock bin 7, a hopper 9, a blanking device 10, a discharge pipe 11, a smoke bin 12, a smoke cone hopper 8 and a smoke pipeline 5, wherein a feed inlet is arranged at the top of the shell 6, a material separating cone 2 and a material blocking ring 3 are arranged at the upper part in the preheating bin 4, the stock bin 7 is connected with the lower part of the material separating cone 2, the stock bin 7 is a ventilating stock bin, the lower part of the stock bin 7 is connected with the hopper 9, a discharge valve 91 is arranged at the lower part of the hopper 9, the blanking device 10 is arranged at the lower part of the discharge valve 91, the discharge outlet of the blanking device 10 is connected with the discharge pipe 11 extending into the feed end of a rotary kiln, pellets 1 enter the preheating bin from an inlet and enter the stock bin 7, the material falls under the control of a discharge valve 91 and enters the rotary kiln 13 through a discharge pipe by a discharging device 10; a smoke conical hopper 6 is installed on the lower portion of a preheating bin 4, a straight section of the lower portion 8 of the conical hopper penetrates through the middle of a discharging device 10 to be connected with a smoke bin 12, the lower portion of the smoke bin 12 is connected with a smoke outlet at the front end of a feed inlet of a rotary kiln 13, a smoke pipeline 5 is installed on the outer ring of the preheating bin 4 to be communicated with a smoke channel in the preheating bin, smoke enters the smoke bin 12 from the front end of the feed inlet of the rotary kiln 13, then enters the smoke conical hopper 8, then enters the preheating bin 4 to exchange heat with pellets 1 in a bin 7, is reduced to below 200 ℃ and is sucked into a bag-type dust collector through the smoke pipeline 5.

The storage bin 7 in the preheating bin comprises a framework square pipe 71, a bottom supporting square pipe 72 and grid steel plates 73, wherein the two framework square pipes are connected together to form a group and fixed on the bottom supporting square pipe 72, 16 groups of framework square pipes are enclosed into a circle or 20 groups of framework square pipes are enclosed into a circle, the grid steel plates 73 are respectively installed on the framework square pipes 71, the grid steel plates 73 are made of materials with excellent heat resistance and special grid shapes, one layer is arranged inside and outside, and a circular ring-shaped storage bin is formed

The stock bin in the preheating bin further comprises 8 partition plates 74 which are fixed between the two framework square tubes and divide the stock bin into 8 chambers.

2 corrosion-resistant and wear-resistant thermal resistors 15 are installed in each chamber of the stock bin, the temperature in the stock bin is monitored in real time, and the discharge valve 91 at the bottom of the hopper 9 is opened and closed according to the monitored temperature, so that reasonable discharge is realized.

The framework square pipe 71 and the bottom supporting square pipe 72 of the stock bin 7 are communicated to form an air cooling pipeline, cold air is extracted from the outer end of the bottom supporting square pipe 72 by utilizing negative pressure formed by a bag-type dust collector arranged at the tail end of the flue gas pipeline 5, the framework square pipe 71 is cooled, the outer end of the bottom supporting square pipe 72 is provided with an air cooling valve 17, the opening degree of the air cooling valve 17 is adjusted according to the temperature monitored by the corrosion-resistant and wear-resistant thermal resistor 15, and the cooling air volume is controlled, so that the working temperature of the stock bin 7 is effectively controlled.

The above-mentioned hoppers 9 are 16 in total and are installed below the silo 7. The bottom of the hopper 9 is provided with a discharge valve 91.

The blanking device 10 is provided with a scraping plate 101, a rotary material tray 102, a slewing bearing 103 and a speed reduction motor driving device 104, the scraping plate 101 is fixed on an equipment support through a connecting plate, the rotary material tray 102 is fixed at the top of an outer ring of the slewing bearing through a steel beam, the bottom of the inner ring of the slewing bearing is fixed on a concrete beam plate, the speed reduction motor driving device 104 of the blanking device drives a large gear of the outer ring of the slewing bearing to rotate through pinion transmission, so that the rotary material tray and metallurgical pellet materials falling on the rotary material tray are driven to rotate around the center, the scraping plate scrapes the metallurgical pellet materials into a discharging pipe 11, and the metallurgical.

An ash hopper 18 and an ash discharge valve 19 are arranged below the tobacco bin 12 to prevent dust from entering the rotary kiln 13, and collected dust is pneumatically conveyed to a raw material workshop to participate in batching again.

20 dust removal valves 16 are uniformly distributed below the shell, and are switched on and off at regular time according to production and equipment running conditions, and dust falling into the bottom of the shell is absorbed by using negative pressure formed by a bag-type dust remover.

An access door is arranged in the middle of the preheating bin 4.

The inner side of the shell 6 is provided with a refractory material.

Claims

1. A vertical preheater comprises a shell, a preheating bin, a hopper, a blanking device, a discharging pipe, a smoke bin, a smoke cone hopper and a smoke pipeline, and is characterized in that a feeding hole is formed in the top of the shell, a material separating cone and a material blocking ring are mounted on the upper portion of the preheating bin, the material separating cone is connected with the bin below the material separating cone, the bin is a breathable bin, the hopper is connected to the lower portion of the bin, a discharging valve is mounted on the lower portion of the hopper, the blanking device is mounted on the lower portion of the discharging valve, the discharging pipe extending into the feeding end of a rotary kiln is connected to the discharging hole of the blanking device, pellets enter the preheating bin from an inlet and enter the rotary kiln under the action of the material separating cone hopper and the material blocking ring, and after heat exchange, the; the lower part of the preheating bin is provided with a smoke conical hopper, a straight section at the lower part of the conical hopper penetrates through the middle of the blanking device to be connected with the smoke bin, the lower part of the smoke bin is connected with a smoke outlet at the front end of a feed inlet of the rotary kiln, a smoke pipeline is arranged on the outer ring of the preheating bin to be communicated with a smoke channel in the preheating bin, smoke enters the smoke bin from the front end of the feed inlet of the rotary kiln, then enters the smoke conical hopper, enters the preheating bin to exchange heat with pellets in the bin, is reduced to below 200 ℃ and is sucked into a bag-type dust collector through the smoke pipeline, and after.

2. A vertical pre-heater according to claim 1, characterized in that the storage bin comprises framework square tubes, bottom support square tubes and grid steel plates, wherein two framework square tubes are connected together to form a group and fixed on the bottom support square tubes, a plurality of groups of framework square tubes are encircled to form a circle, the grid steel plates are respectively installed on the framework square tubes, the grid steel plates are made of materials with excellent heat resistance and special grid shape, and the inner side and the outer side of the grid steel plates are respectively provided with a layer to form a circular storage bin.

3. A vertical preheater as claimed in claim 2, wherein said preheating chamber further comprises 8 partition plates fixed between two framework square tubes for dividing the preheating chamber into 8 chambers.

4. A vertical preheater as claimed in claim 3, wherein each chamber of said silo is provided with 2 corrosion-resistant and wear-resistant thermal resistors for monitoring the temperature inside the silo.

5. A vertical preheater as recited in claim 2 wherein said bin is formed with a skeletal square tube in communication with a bottom support square tube to form an air-cooled duct.

6. The vertical preheater according to claim 2, wherein the air-cooled valves are mounted at the outer ends of the bottom supporting square tubes of the storage bin, and the opening and closing degree of the air-cooled valves is adjusted according to the monitored temperature by using the negative pressure formed by the bag-type dust collector to control the air volume, thereby effectively controlling the working temperature of the storage bin.

7. A vertical preheater according to claim 1, wherein 16 hoppers are provided below the hopper, and discharge valves are provided at the bottom of the hoppers.

8. A vertical preheater according to claim 1, wherein said blanking device comprises a scraping plate fixed to the equipment frame through a connecting plate, a rotary tray fixed to the top of the outer ring of the rotary support through a steel beam, a rotary support fixed to the bottom of the inner ring of the rotary support through a concrete beam, and a reduction motor driving device for driving the reduction motor of the blanking device to rotate a large gear of the outer ring of the rotary support through a small gear transmission, so as to drive the rotary tray and the metallurgical pellet material falling on the rotary tray to rotate around the center, and the scraping plate scrapes the metallurgical pellet material into the discharge pipe and into the rotary kiln.

9. A vertical preheater as recited in claim 1 wherein said hopper is provided with an ash hopper and an ash discharge valve below said flue to prevent dust from entering said rotary kiln and to pneumatically transport collected dust to said raw material plant for re-distribution.

10. A vertical preheater as claimed in claim 1, wherein 20 dust-removing valves are disposed under said casing, and are opened and closed at regular intervals according to the operation of the production and equipment, and the dust falling into the bottom of the casing is removed by the negative pressure generated by the bag-type dust remover.

11. A vertical preheater as recited in claim 1 wherein said preheater means has an access door at the center thereof.

12. A vertical preheater as set forth in claim 1, wherein said housing is provided with refractory material on an inner side thereof.