CN210945738U - Production line for producing high-grade direct method zinc oxide - Google Patents

Abstract

The utility model discloses a production line for producing high-grade zinc oxide by direct method, which comprises a furnace body, wherein the middle part of the furnace body is provided with a smoke throat, the outlet of the smoke throat is connected with an oxidation chamber, the oxidation chamber is connected with a smoke tunnel, the smoke tunnel is respectively connected with a waste gas dust collecting system and a dust collecting chamber, the dust collecting chamber is connected with a cooling chamber, the cooling chamber is connected with a pulse dust collector, the pulse dust collector is connected with a desulfurizing tower, and a draught fan is arranged between the pulse dust collector and the desulfurizing tower; the furnace body, the smoke throat and the oxidation chamber form a grate furnace, the smoke throat is vertical to the furnace body, the oxidation chamber is vertical to the furnace body through the smoke throat, and furnace doors are arranged on two longitudinal sides of the furnace body; the furnace body adopts a chain type grate furnace structure, and a slag scraping and breaking system is arranged inside the furnace body; both sides of the furnace body are provided with a pellet feeding system. The utility model discloses possess the high production efficiency of rotary kiln method, possess the ability of weishi furnace method production high-grade direct method zinc oxide again, realize high-efficient low-cost production high-quality direct method zinc oxide product.

Description

Production line for producing high-grade direct method zinc oxide

Technical Field

The utility model relates to the technical field of non-ferrous metal smelting, in particular to a production line for producing high-grade direct method zinc oxide.

Background

Direct method zinc oxide is smelted by zinc calcine and zinc ore raw materials through reaction processes such as reduction, oxidation and the like by a pyrogenic process, and corresponding indirect method zinc oxide is smelted by zinc calcine and zinc ore into zinc ingots, the zinc ingots are heated, smelted, evaporated and oxidized, the indirect method is called as an indirect method because the indirect method is performed through an intermediate smelting process, at present, the method for producing the zinc oxide by the direct method generally adopts a Webster furnace production method and a rotary kiln production method, and the high-grade direct method zinc oxide is produced by smelting the zinc calcine serving as a raw material by a Webster furnace production line, the Webster furnace is a production line for smelting by a static fixed furnace bed, manually feeding and manually raking slag, the other method for producing the direct method zinc oxide is a hot equipment for heating and processing bulk or slurry materials, and belongs to rotary kiln cylindrical equipment, the zinc oxide is widely applied to the industrial departments of nonferrous metallurgy, ferrous metallurgy, chemical industry, cement, refractory materials, lime and the like, and is mainly used for drying, roasting, enriching valuable metals and producing low-grade zinc oxide in the zinc smelting industry.

However, the production method of the high-grade direct method zinc oxide by using the Wells furnace production line can achieve the production target of manufacturing the high-grade direct method zinc oxide, but the production method is of an intermittent operation type, manual operation, high labor intensity, large heat radiation, high requirement on labor force, and is influenced by manpower capacity, the general hearth area is 6-12 square meters, the feed per furnace is up to 2.7 tons at most according to the Wells furnace with 12 square meter hearth area, nine furnaces are 24.3 tons per day, the per-man feed amount is 0.52 tons, the direct recovery rate of zinc is less than 90 percent, the per-day direct method zinc oxide of each production line is less than 8 tons, the per-man shift output is less than 0.14 tons, the production efficiency is low, the production cost is high, and is influenced by manual operation, the quality of feed and raking slag generally has unstable conditions, sometimes, the fed bottom coal is uneven and agglomerated ore is piled, and the raking slag is not clean, the smelting process is unstable, the product recovery rate and the product quality are easy to reduce, the direct method zinc oxide is produced by using the rotary kiln production line, the production is continuous, can overcome the defects of small treatment capacity, low production efficiency and high production cost of a Webster furnace production line, but cannot design an exhaust gas dust collecting system and perform exhaust gas discharge process operation due to continuous feeding and continuous smelting, and the continuous turnover of the kiln generates mechanical dust in the production process, the produced product has poor quality, the zinc oxide product has low grade and color difference, compared with the traditional Webster furnace, the method only improves the production efficiency, the product quality grade is much lower than that of the Webster furnace production line, the coal consumption and other auxiliary materials such as lime and the like are consumed, therefore, the method is used for producing direct zinc oxide, in particular high-grade zinc oxide, and has obvious defects and can not produce high-grade zinc oxide.

Disclosure of Invention

The utility model provides a production line of production high-grade direct method zinc oxide, this production line possess the throughput and the high production efficiency of rotary kiln production method promptly, possess the ability of weishi stove production method production high-grade direct method zinc oxide again, realize high-efficient low-cost high-quality high-grade direct method zinc oxide product of production, can save the investment simultaneously, possess the grate furnace of same throughput, the production line investment amount is about the advantage of the fourth of rotary kiln production line investment amount.

The utility model provides a following technical scheme:

a production line for producing high-grade zinc oxide by a direct method comprises a furnace body, wherein a smoke throat is arranged in the middle of the furnace body, an oxidation chamber is connected at the outlet of the smoke throat, the oxidation chamber is connected with a smoke tunnel, the smoke tunnel is respectively connected with a waste gas dust collecting system and a dust collecting chamber, the dust collecting chamber is connected with a cooling chamber, the cooling chamber is connected with a pulse dust collector, the pulse dust collector is connected with a desulfurizing tower, an induced draft fan is arranged between the pulse dust collector and the desulfurizing tower, and the desulfurizing tower is connected with a chimney; the furnace is characterized in that the furnace body, the smoke throat and the oxidation chamber form a grate furnace, the smoke throat is vertical to the furnace body, the oxidation chamber is vertical to the furnace body through the smoke throat, and furnace doors are arranged on two longitudinal sides of the furnace body;

the chain type grate system is arranged in the grate furnace and comprises a grate and a transmission device, the grate is a chain type grate, the grate sheet is divided into a driving sheet and a driven sheet, and the driving sheet is a chain link; the fire grate is provided with a fire grate guide rail; the grate is arranged on a driving chain wheel and a driven chain wheel, and one side close to the driving chain wheel and the driven chain wheel is respectively provided with a guide rail cooling and waste heat utilization system which comprises a guide rail cooling fan and a furnace bottom blower; the transmission device comprises a fire grate driving motor;

the grate furnace is provided with a slag scraping and breaking system, slag breaking equipment of the slag scraping and breaking system extends to the outside of the furnace door at one side of the furnace body, and a coal feeder is arranged outside the furnace door at the other side of the furnace body; the slag scraping and breaking system comprises a slag scraping mechanism and a slag breaking mechanism, the slag scraping mechanism comprises eight slag scraping sheets on the grate, the slag breaking mechanism is positioned on one side of the grate, which is close to the driven roller, and the slag breaking mechanism comprises a hollow shaft, a hook hammer and a driving device;

both sides of the furnace body are provided with pellet feeding systems which comprise a combination body and a driving system, wherein the combination body consists of a feeding car track, a pellet feeding car and a feeding bottom plate car at both ends of the grate furnace.

Build by laying bricks or stones cigarette larynx stove arch on the stove body middle part stove arch of grate furnace, the space that the furnace body middle part position formed a flue gas and assembled, cigarette larynx stove arch is perpendicular with the stove body stove arch direction, and the cigarette larynx export is at the fore-and-aft middle part of furnace body, and the furnace body middle part is horizontal to be passed through the cigarette larynx and links to each other with the oxidizing chamber, and the oxidizing chamber stove arch is higher than cigarette larynx stove arch, has the connector of matching between oxidizing chamber and the throat, and the connector both sides are built by laying bricks or stones the flue gas disturbance wall.

In the guide rail cooling and waste heat utilization system, a guide rail cooling pipe is fixedly sleeved at an air outlet of a guide rail cooling fan, and the guide rail cooling pipe is arranged on one side of a grate guide rail in the furnace body and respectively communicated with the grate guide rail; a hot air inlet pipe is fixedly sleeved at an air inlet of the furnace bottom blower, the air inlet of the furnace bottom blower is fixedly sleeved with an air outlet of the guide rail cooling pipe, and a furnace bottom air channel is fixedly sleeved at an air outlet of the furnace bottom blower;

the grate guide rail is made of square tubes, a rectangular inner cavity serves as a cooling air duct, the upper grate guide rail is connected and supported through a transverse beam I-shaped steel bracket, the lower grate guide rail is connected and supported through an I-shaped steel chain row dragging bottom frame, I-shaped steel is sealed by a sealing steel plate to form an inner cavity, the inner cavity is communicated with the inner cavity of the guide rail, and a cooling fan blows air for cooling during operation.

The slag scraping mechanism of the slag scraping and breaking system comprises eight slag scraping sheets on the fire grate, the eight slag scraping sheets are respectively divided into two groups, each group is four, the two groups of slag scraping sheets are respectively positioned on the two sides of the two ends of the fire grate and the fire grate in the middle, the side slag scraping sheets positioned on the two sides are closely mounted with the furnace wall of the fire grate furnace, and the middle slag scraping sheets positioned in the middle two groups and the side slag scraping sheets positioned on the two sides are transversely mounted on the fire grate in the same straight line; the slag breaking mechanism is positioned on one side of the fire grate close to the driven roller and comprises a hollow shaft, a hook hammer and a driving device, the driving device comprises a slag breaking driving motor, the slag breaking driving motor is connected with a slag breaking driving speed reducer through a slag breaking driving belt pulley, the slag breaking driving speed reducer is connected with a rotating shaft through a chain wheel, and the middle part of the rotating shaft is fixedly sleeved with the hollow shaft; the hollow shaft is provided with a plurality of groups of hook hammers.

The agglomerate feeding system also comprises a furnace door track positioned on the side of the furnace door, a coal feeding hopper and a coal hopper track are arranged on the side of the furnace door at one end of the grate furnace, the furnace door track is connected with the coal hopper track, a coal hopper track support frame is arranged on one side of the bottom of the coal hopper track, a feeding car scraping plate at one end is fixed on the coal hopper track support frame, a feeding car scraping plate at the other end is fixed on the feeding car track, and a combination body of an agglomerate feeding car and a feeding bottom plate car is arranged on the two sets of feeding car tracks and is driven by rollers; the whole combination of the pellet feeding car and the feeding bottom plate car is arranged on the base through the feeding car track.

The utility model discloses possess following beneficial effect:

1. the utility model discloses compare with the wechsler furnace production method, grate furnace area is much bigger than the wechsler furnace area, corresponding input can not receive the manpower to influence much, production efficiency improves greatly, productivity improves about eightfold, coal consumption and power consumption reduce to some extent, ton product fixed cost and fixed cost greatly reduced, direct rate of recovery improves more than 3%, total rate of recovery improves about 3%, manufacturing cost greatly reduced, and mechanized can avoid manual operation's unstability, avoid the harmful effects to product quality and rate of recovery.

2. The utility model discloses compare with the rotary kiln production method, the utility model discloses a throughput can reach the throughput of rotary kiln, the utility model discloses a production efficiency, coal consumption, power consumption etc. are close or reach the rotary kiln production method, and manufacturing cost is lower, the utility model discloses a production facility investment amount is less than the rotary kiln production line of equal throughput greatly, the utility model discloses the above-mentioned specification is "fire grate furnace" production line total investment quota of 28 square meters (8 × 3.5.5) and is about 400 ten thousand yuan, and equal throughput, same cooling subsides and tail gas treatment facility's phi 2.4 meters × 36 meters rotary kiln investment amount is more than 1600 ten thousand yuan.

Summarizing, the utility model has the advantages of obvious, the existing advantage of high production efficiency, low production cost can realize producing the target of high quality, high-grade direct method zinc oxide again, and production line equipment investment is few, can realize than higher economic benefits, each item such as carbon dioxide discharges also corresponding reduction.

Drawings

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

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic view of the front end of the production line of the present invention;

FIG. 4 is a schematic view of a grate furnace of the present invention;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a left side view of FIG. 4;

fig. 7 is a schematic view of the rail cooling and waste heat utilization system of the present invention;

FIG. 8 is a top view of FIG. 7;

FIG. 9 is a left side view of FIG. 7;

FIG. 10 is a schematic view of the slag scraping and breaking system of the present invention;

FIG. 11 is a top view of FIG. 10;

FIG. 12 is a left side view of FIG. 10;

FIG. 13 is a schematic view of the slag breaking mechanism of the present invention;

fig. 14 is a schematic view of the pellet feeding system of the present invention;

FIG. 15 is a schematic view of a pellet feeder carriage;

FIG. 16 is a top view of FIG. 15;

FIG. 17 is a left side view of FIG. 15;

FIG. 18 is a schematic view of a feed floor truck;

fig. 19 is a top view of fig. 18.

Fig. 20 is a left side view of fig. 18.

In the figure: 1. a furnace body; 2. (ii) the throat; 3. an oxidation chamber; 4. a smoke lane; 5. an exhaust gas dust collection system; 6. a dust collecting chamber; 7. a cooling chamber; 8. a pulse dust collector; 9. an induced draft fan; 10. a desulfurizing tower; 11. a chimney; 12. a furnace door; 13. a slag scraping and breaking system; 14. a guide rail cooling and waste heat utilization system; 15. a pellet feeding system; 16. a coal feeder; 17. a guide rail cooling fan; 18. a furnace bottom blower; 19. a grate driving motor; 20. a furnace body arch; 21. a throat arch; 22. an oxidation chamber arch; 23. a connecting port; 24. a flue gas disturbance wall; 25. a driven drum; 26. a drive sprocket; 27. a driven sprocket; 28. a slag breaking driving belt pulley; 29. driving a speed reducer by breaking slag; 30. a rotating shaft; 31. a sprocket; 32. a base; 33. a guide rail cooling pipe; 34. a grate guide rail; 35. a hot air inlet pipe; 36. a furnace bottom air channel; 37. a transverse beam I-steel bracket; 38. an I-shaped steel chain row dragging underframe; 39. sealing the steel plate; 40. scraping a slag sheet; 41. side slag scraping sheets; 42. middle slag scraping sheets; 43. a hollow shaft; 44. hooking and hammering; 45. the slag is broken and the motor is driven.

151. A furnace door track; 152. a coal feeding hopper; 153. a coal hopper rail; 154. a coal hopper rail support frame; 155. the feeding car scrapes the flat plate; 156. a feeder car track; 157. a pellet feeding floor vehicle; 158. a pellet feeding car.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-20, a production line for producing high-grade zinc oxide by a direct method comprises a furnace body 1, wherein a smoke throat 2 is arranged in the middle of the furnace body 1, an oxidation chamber 3 is connected at the outlet of the smoke throat 2, the oxidation chamber 3 is connected with a smoke tunnel 4, the smoke tunnel 4 is respectively connected with a waste gas dust collection system 5 and a dust collection chamber 6, the dust collection chamber 6 is connected with a cooling chamber 7, the cooling chamber 7 is connected with a pulse dust collector 8, the pulse dust collector 8 is connected with a desulfurizing tower 10, an induced draft fan 9 is arranged between the pulse dust collector 8 and the desulfurizing tower 10, and the desulfurizing tower 10 is connected with a chimney 11; the furnace is characterized in that a furnace body 1, a smoke throat 2 and an oxidation chamber 3 form a grate furnace, the smoke throat 2 is vertical to the furnace body 1, the oxidation chamber 3 is vertical to the furnace body 1 through the smoke throat 2, and furnace doors 12 are arranged on two longitudinal sides of the furnace body 1;

the chain type grate system is arranged in the grate furnace and comprises a grate and a transmission device, the grate is a chain type grate, the grate sheet is divided into a driving sheet and a driven sheet, and the driving sheet is a chain link; the fire grate is provided with a fire grate guide rail; the fire grate is arranged on a driving chain wheel 26 and a driven chain wheel 27, and one side of the fire grate close to the driving chain wheel 26 and the driven chain wheel 27 is respectively provided with a guide rail cooling and waste heat utilizing system 14 which comprises a guide rail cooling fan 17 and a furnace bottom blower 18; the transmission device comprises a fire grate driving motor 19;

the grate furnace is provided with a slag scraping and breaking system 13, a slag breaking device of the slag scraping and breaking system 13 extends to the outside of a furnace door 12 on one side of the furnace body 1, and a coal feeder 16 positioned on the outside of the furnace body 1 is arranged on one side of the furnace door 12 far away from the slag scraping and breaking system 13; the slag scraping and breaking system comprises a slag scraping mechanism and a slag breaking mechanism, the slag scraping mechanism comprises eight slag scraping sheets on the grate, the slag breaking mechanism is positioned on one side of the grate, which is close to the driven roller 25, and the slag breaking mechanism comprises a hollow shaft, a hook hammer and a driving device;

both sides of the furnace body 1 are provided with a pellet feeding system 15 which comprises a combination body and a driving system, wherein the combination body consists of a feeding car track, a pellet feeding car and a feeding bottom plate car at both ends of the grate furnace.

The flue gas disturbing wall comprises a flue gas inlet, a flue gas outlet, a.

In the guide rail cooling and waste heat utilization system 14, a guide rail cooling pipe 33 is fixedly sleeved at an air outlet of a guide rail cooling fan 17, and the guide rail cooling pipe 33 is arranged at one side of a fire grate guide rail 34 in the furnace body 1 and is respectively communicated with the fire grate guide rail 34; a hot air inlet pipe 35 is fixedly sleeved at an air inlet of the furnace bottom blower 18, the air inlet of the furnace bottom blower 18 is fixedly sleeved with an air outlet of the guide rail cooling pipe 33, and a furnace bottom air channel 36 is fixedly sleeved at an air outlet of the furnace bottom blower 18;

the grate guide rail 34 is made of square tubes, a rectangular inner cavity serves as a cooling air duct, an upper grate guide rail is connected and supported through a transverse beam I-shaped steel bracket 37, a lower grate guide rail is connected and supported through an I-shaped steel chain row dragging bottom frame 38, I-shaped steel is sealed through a sealing steel plate 39 to form an inner cavity, the inner cavity is communicated with the inner cavity of the guide rail, and a cooling fan blows air for cooling during operation.

The slag scraping mechanism of the slag scraping and breaking system 13 comprises eight slag scraping sheets 40 on the fire grate, the eight slag scraping sheets 40 are respectively two groups, each group is four, the two groups of slag scraping sheets 40 are respectively positioned on two sides of two ends of the fire grate and the fire grate in the middle, the side slag scraping sheets 41 on two sides are closely mounted with the furnace wall of the fire grate furnace, and the middle slag scraping sheets 42 in the middle two groups and the side slag scraping sheets 41 on two sides are transversely mounted on the same straight line of the fire grate; the slag breaking mechanism is positioned on one side of the fire grate close to the driven roller 25, the slag breaking mechanism comprises a hollow shaft 43, a hook hammer 44 and a driving device, the driving device comprises a slag breaking driving motor 45, the slag breaking driving motor 45 is connected with a slag breaking driving speed reducer 29 through a slag breaking driving belt pulley 28, the slag breaking driving speed reducer 29 is connected with a rotating shaft 30 through a chain wheel 31, and the hollow shaft 43 is fixedly sleeved in the middle of the rotating shaft 30; the hollow shaft 43 is provided with a plurality of sets of hook hammers 44.

The agglomerate feeding system 15 further comprises a furnace door track 151 positioned on the side of the furnace door, a coal hopper 152 and a coal hopper track 153 are arranged on the side of the furnace door at one end of the grate furnace, the furnace door track 151 is connected with the coal hopper track 153, a coal hopper track support frame 154 is arranged on one side of the bottom of the coal hopper track 153, a feeding car scraping plate 155 at the end is fixed on the coal hopper track support frame 154, a feeding car scraping plate 155 at the other end is fixed on a feeding car track 156, and a combination of an agglomerate feeding car 158 and a feeding bottom plate car 157 is installed on the two sets of feeding car tracks 156 and is driven by rollers; the entire combination of the pellet feeder carriage 158 and the feed floor carriage 157 is positioned on the base 32 by the carriage rails 156.

The production line flow comprises the following steps:

s1, using zinc-containing materials and anthracite as raw materials, adding auxiliary materials, mixing the materials by a briquetting system, pressing the materials into pellets, drying the pellets in the air, and producing the briquettes by using firewood and diesel oil to ignite lump coal in the first production; firstly, starting a guide rail cooling system, and simultaneously checking whether a standby cooling fan is in a good state; the process comprises the steps of performing motion slag discharging, slag scraping, slag discharging, slag breaking, slag conveying and slag processing according to the starting sequence of a slag processing system, a slag conveyor, a slag breaking system and a grate driving system, wherein during normal production, the systems are started, performing motion slag discharging, slag scraping, slag discharging, slag breaking, slag conveying and slag processing in sequence, flatly paving smokeless small coal blocks on a grate by a coal feeder while performing slag scraping, slag discharging and slag breaking on the grate, wherein the weight of bottom coal added into each furnace is 0.8-1.0 ton, and the flatly paving of the coal blocks is completed while completing slag discharging, and the time is 8-10 minutes; stopping the machine, wherein the shutdown sequence is opposite to the startup sequence;

s2, a 'static smelting' process, namely a static fixed grate hearth smelting process, namely closing a furnace door, igniting lump coal under the reflection action of heat in a furnace body, blowing air to be red hot after combustion for 5-6 minutes, then opening the furnace door, then simultaneously throwing the briquettes by the briquette feeding systems at two sides of a grate furnace, wherein the thickness of a material layer is uniform, 8-10 tons of material are thrown in each furnace, the feeding time is 1-1.5 minutes, closing the furnace door 12 again, blowing air and starting an exhaust gas system, discharging the exhaust gas for 5-7 minutes, removing water and low-boiling-point impurities in furnace burden as clean as possible so as to avoid influencing the product quality, closing the exhaust gas system after the exhaust gas is discharged, starting an induced draft fan, slowly raising a flashboard containing zinc, namely entering a formal smelting period, converging steam smoke generated by smelting at a smoke throat, entering an oxidation chamber from the smoke throat under the action of the induced draft fan, sucking fresh air into the oxidation chamber under the action of negative pressure generated by the induced draft fan, oxidizing zinc-containing steam into zinc oxide smoke, cooling the zinc oxide smoke by a smoke tunnel, a dust collecting chamber, a cooling chamber and a pulse dust collector, and performing dust collecting sedimentation and dust collection to obtain a high-grade zinc oxide product;

s3, a smelting period is 105-115 minutes, after smelting is finished, a furnace bottom blower fan 144 and an induced draft fan are shut down, a guide rail cooling fan 141 of a grate 166 still runs, a furnace door gate is opened, a 'moving slag discharging' process is started again, all systems are started according to the starting sequence of a slag processing system, a slag conveyor, a slag breaking system 13 and a grate driving system, moving slag discharging is carried out, slag scraping, slag discharging, slag breaking, slag conveying and slag processing are carried out in sequence, large slag becomes small slag and crushed slag under the action of the slag scraping and slag breaking system 13, lump coal is flatly laid when the slag scraping, slag discharging and slag breaking are carried out on the grate, a next smelting period is started, and the circulation is repeated and continuously circulated, one cycle period is one furnace, 10 cycles are carried out every day, namely, the furnace is smelted for 10 furnaces, the lump coal is processed for 80-100 tons every day, 8-10 tons of lump coal is added, the mixture is 88-110 tons, the treatment capacity of a set of 2.4-meter × 36 meter rotary kiln, the production capacity is equivalent to a set of a 3-ton manual bag-3.3-3-ton manual production, and the production of full-bag-3.3-ton manual zinc bag-3.3-3-ton manual zinc bag-manual production is required.

The working principle is as follows: the first process is 'static smelting of grate furnace', the grate furnace is in static fixed state after four processes of putting fuel lump coal (the first time of putting fuel lump coal needs ignition, igniting lump coal by utilizing heat reflection in the furnace body each time later), lump coal red heat, putting agglomerate, blowing furnace bottom to formal smelting, stopping blowing furnace bottom after smelting is finished, starting a driving device, simultaneously starting a slag scraping and breaking system, completing grate movement, slag discharging, slag scraping and slag breaking simultaneously, namely, completing the second process, namely, 'grate intermittent movement slag discharging', then entering the next smelting cycle of putting lump coal and other processes, the grate furnace is composed of a furnace body, a smoke throat and an oxidation chamber, two ends of the furnace body with special structure are provided with two furnace doors for feeding and slag discharging, the middle part of the furnace body is provided with a smoke throat, the smoke throat is provided with a single furnace arch, the smoke throat furnace arch is vertical to the furnace arch direction of the main body of the grate furnace, and the smoke throat outlet is arranged at the longitudinal middle part of the main body of, the zinc-containing steam flue gas generated in the smelting process is collected at the smoke throat part and enters the oxidation chamber from a connecting port under the action of a draught fan of the production line, the zinc-containing steam flue gas is subjected to oxidation reaction with sucked fresh air in the oxidation chamber, the zinc-containing steam flue gas is converted into zinc oxide-containing flue gas, the zinc oxide-containing flue gas is cooled and settled through a smoke tunnel, a dust collecting chamber and a cooling chamber, the zinc oxide-containing flue gas enters a pulse dust collector for dust collection, a zinc oxide product is obtained, purified gas after smoke dust removal is desulfurized by a desulfurizing tower and then is discharged from a chimney, a cooling system of a grate guide rail in the whole production process is operated all the time, the cooling system is an independent system, forced ventilation and cooling are carried out through a blower, the cooling of the guide rail during slag discharge during the smelting process and after blowing of the bottom of a furnace is stopped, the guide rail made of carbon, paving and flattening lump coal, throwing the red hot lump coal by using a feeding system to ensure that the thickness of a material layer is uniformly paved, wherein the feeding system consists of a set of combination device of a fixed feeding car track, a movable lump ore feeding car and a lump ore feeding bottom plate car at two ends of a grate furnace, the sum of the effective areas of the two sets of lump ore feeding cars is the same as the total effective smelting total area of the grate furnace, driving the combination device of the lump ore feeding car and the lump ore feeding bottom plate car to move forwards to a feeding position of the grate furnace, scraping the lump ore feeding car by a scraping plate of the feeding car fixed on the feeding car track to ensure that the thickness of the lump ore layer in the lump ore feeding car is uniform, starting a driving device of the lump ore feeding bottom plate car, returning the lump ore feeding bottom plate car to the original position of the feeding car track, uniformly throwing the lump ore in the lump ore feeding car on the red hot coal, starting the driving device of the lump ore feeding car, returning the lump ore feeding car to the original position of the feeding car track, the utility model discloses a slay is broken into little piece sediment to the slay feeding car, the slay piece is scraped to the reunion body device of slay feeding bottom plate car group one-tenth, respectively install four on the both sides at grate furnace grate both ends and the grate in the middle of grate, constitute and scrape the sediment system, the slag piece is scraped to the side and is condensed on the grate oven when striking off the smelting, and the hardened slag in the middle part of the stove is taken away in preliminary breakage, ensure to slag out totally not remain, the side of slagging tap of grate furnace sets up broken slag system, make the smelting process board become bold slag breakage and become the fritter sediment, ensure to slag out and go on smoothly, the fritter bold sediment that the fritter hardens breaks into the frit.

The method comprises the steps of taking a 'chain type grate furnace' with the specification of 28 square meters (8 ×.5) as an example to illustrate the process method of the production line and the technical and economic indexes which can be achieved by the method, using zinc-containing materials and anthracite as raw materials, adding auxiliary materials, mixing and pressing the materials into pellets through a pelletizing system, drying the pellets to produce, using firewood and diesel to ignite the lump coal in the first production, firstly starting a guide rail cooling system, simultaneously checking whether a standby cooling fan is in a good state or not, performing a 'motion slag tapping' process, when in normal production, starting a slag processing system, a slag conveyor, a slag breaking system and a grate driving system according to the starting sequence of the slag processing system, paving small lumps of coal on a grate according to a coal feeder, finishing the coal dust collection, slag scraping, slag breaking, slag discharging, and slag discharging, simultaneously, enabling the furnace door to be completely started, a furnace door of a blast furnace, a blast furnace door, a furnace, a blast furnace, a furnace door, a blast furnace, a furnace door, a furnace, a blast furnace door, a furnace door, a furnace, a blast furnace, a furnace door, a furnace door, a furnace, a blast furnace, a furnace door, a furnace, a blast furnace door, a furnace door, a furnace door, a furnace door, a furnace door, a furnace door, a furnace, a blast furnace, a furnace door.

To sum up, the utility model discloses a characteristics:

1. the chain type grate furnace which is generally used for the sintering of a boiler or iron ore is used for producing high-grade direct-method zinc oxide through innovation.

2. The grate furnace is provided with furnace doors for feeding and discharging materials at two longitudinal sides, wherein one side of each furnace door is used for feeding coal, and the other side is used for discharging residues; the briquettes are fed from two sides of the furnace doors at the same time. The chain grate furnace is generally used for sintering a boiler or iron ore, and one side of the chain grate furnace is fed with coal and the other side is tapped.

3. The smoke throat with the special structure in the middle is perpendicular to the furnace body, smoke and smoke drainage are gathered, the distance of smoke volatilization flow is short, and the structure creates conditions for enlarging the area of the hearth and improving the feeding amount. General way, the flue gas is direct to flow to the oxidizing chamber from vertical one side of furnace body, the utility model discloses this structure has shortened the flow distance of flue gas, avoids the flue gas to subside or condense in the furnace body and become hanging etc. the influence is smelted and is retrieved a rate.

4. The furnace body is connected with the oxidation chamber through the smoke throat and is vertically arranged, thereby being beneficial to the collection and the flow of smoke, creating space conditions for feeding at two longitudinal sides, greatly increasing the area of the furnace chamber and greatly improving the feeding amount. In the traditional Webster furnace, the furnace body and the oxidation chamber are arranged in a longitudinal linear mode.

5. The guide rails and the transverse supporting beams are cooled, so that the problem of rigidity of a high-temperature smelting furnace body made of common materials is solved, the deformation of a furnace body steel structure and parts thereof due to temperature change is greatly reduced, the operation reliability is greatly improved, the maintenance rate is reduced, and the service life of equipment is prolonged; meanwhile, the cooling is realized by forced ventilation and cooling of the air blower, hot air generated in the cooling process is used as a hot air source for blowing air to the furnace bottom, and the hot air which is used for utilizing waste heat from other parts of the production line are used together to provide hot air for the smelting process through the air blower at the furnace bottom, so that the smelting temperature is improved, the coal consumption is saved, the smelting recovery rate is improved, and the cost is saved.

6. The slag scraping sheet is arranged, so that the problem of furnace body slagging is solved, slag and wall hanging on the wall of the furnace body are cleaned, the furnace body keeps a normal effective smelting area, the effect of crushing the slag is achieved, the problem of slag smooth slag discharging of the slag is solved together with a slag breaking device, and production interruption caused by furnace body slagging and slag discharging is avoided.

7. The problem of mechanical throwing of the briquettes is solved, and the briquettes are respectively thrown from furnace doors at the two longitudinal sides of the furnace body by using the briquettes feeding cars, so that the throwing is mechanized, the thickness of a throwing material layer is balanced and consistent, and conditions are created for normal and stable operation of smelting.

8. The process is innovative: the grate furnace is used for producing direct method zinc oxide, the intermittent operation process of guide rail cooling, static smelting and dynamic slag discharging is carried out synchronously with slag scraping, slag discharging and slag breaking, the two sides of a pellet feeding car are fed simultaneously, and smoke gas is gathered at a smoke throat. The ingenious application of intermittent operation satisfies the basic process requirements and conditions for producing high-grade direct method zinc oxide, is a great innovation of the operation mode of a chain type grate furnace, and the common grate furnace is continuously operated when being used for boilers or sintering.

The unexplained parts related to the present invention are the same as or implemented by using the prior art.

Claims (5)

1. A production line for producing high-grade zinc oxide by a direct method comprises a furnace body (1), wherein a smoke throat (2) is arranged in the middle of the furnace body (1), an oxidation chamber (3) is connected at an outlet of the smoke throat (2), the oxidation chamber (3) is connected with a smoke tunnel (4), the smoke tunnel (4) is respectively connected with a waste gas dust collection system (5) and a dust collection chamber (6), the dust collection chamber (6) is connected with a cooling chamber (7), the cooling chamber (7) is connected with a pulse dust collector (8), the pulse dust collector (8) is connected with a desulfurizing tower (10), an induced draft fan (9) is arranged between the pulse dust collector (8) and the desulfurizing tower (10), and the desulfurizing tower (10) is connected with a chimney (11); the method is characterized in that: the furnace body (1), the smoke throat (2) and the oxidation chamber (3) form a grate furnace, the smoke throat (2) is vertical to the furnace body (1), the oxidation chamber (3) is vertical to the furnace body (1) through the smoke throat (2), and furnace doors (12) are arranged on two longitudinal sides of the furnace body (1);

the chain type grate system is arranged in the grate furnace and comprises a grate and a transmission device, the grate is a chain type grate, the grate sheet is divided into a driving sheet and a driven sheet, and the driving sheet is a chain link; the fire grate is provided with a fire grate guide rail; the grate is arranged on a driving chain wheel (26) and a driven chain wheel (27), and one side close to the driving chain wheel (26) and the driven chain wheel (27) is respectively provided with a guide rail cooling and waste heat utilizing system (14) which comprises a guide rail cooling fan (17) and a furnace bottom blower (18); the transmission device comprises a fire grate driving motor (19);

the grate furnace is provided with a slag scraping and breaking system (13), slag breaking equipment of the slag scraping and breaking system (13) extends to the outside of the furnace door (12) at one side of the furnace body (1), and a coal feeder (16) is arranged outside the furnace door (12) at the other side of the furnace body (1); the slag scraping and breaking system comprises a slag scraping mechanism and a slag breaking mechanism, the slag scraping mechanism comprises eight slag scraping sheets on the grate, the slag breaking mechanism is positioned on one side of the grate, which is close to the driven roller (25), and the slag breaking mechanism comprises a hollow shaft, a hook hammer and a driving device;

both sides of the furnace body (1) are provided with pellet feeding systems (15) which comprise a combination body and a driving system, wherein the combination body consists of a feeding car track, a pellet feeding car and a feeding bottom plate car at both ends of the grate furnace.

2. A line for producing high grade direct process zinc oxide as claimed in claim 1 wherein: build by laying bricks or stones cigarette throat (2) and cigarette throat stove arch (21) on the furnace body middle part stove arch (20) of grate furnace, furnace body (1) middle part position forms the space that a flue gas assembles, cigarette throat stove arch (21) and furnace body stove arch (20) direction are perpendicular, cigarette throat (2) export is at furnace body (1) fore-and-aft middle part, furnace body (1) middle part transversely links to each other with oxidation chamber (3) through cigarette throat (2), oxidation chamber stove arch (22) are higher than cigarette throat stove arch (21), there is connector (23) of matching between oxidation chamber (3) and cigarette throat (2), connector (23) both sides are built by laying bricks or stones and are had flue gas disturbance wall (24).

3. A line for producing high grade direct process zinc oxide as claimed in claim 1 wherein: in the guide rail cooling and waste heat utilization system (14), a guide rail cooling pipe (33) is fixedly sleeved at an air outlet of a guide rail cooling fan (17), and the guide rail cooling pipe (33) is arranged at one side of a grate guide rail (34) in the furnace body (1) and respectively led to the grate guide rail (34); a hot air inlet pipe (35) is fixedly sleeved at an air inlet of the furnace bottom blower (18), the air inlet of the furnace bottom blower (18) is fixedly sleeved with an air outlet of the guide rail cooling pipe (33), and a furnace bottom air channel (36) is fixedly sleeved at an air outlet of the furnace bottom blower (18);

the grate guide rail (34) is made of square tubes, a rectangular inner cavity serves as a cooling air duct, an upper grate guide rail is connected and supported through a transverse beam I-shaped steel bracket (37), a lower grate guide rail is connected and supported through an I-shaped steel chain row dragging bottom frame (38), I-shaped steel is sealed through a sealing steel plate (39) to form an inner cavity, the inner cavity is communicated with the inner cavity of the guide rail, and a cooling fan blows air for cooling during operation.

4. A line for producing high grade direct process zinc oxide as claimed in claim 1 wherein: the slag scraping and breaking system (13) is characterized in that a slag scraping mechanism comprises eight slag scraping sheets (40) on a grate, the eight slag scraping sheets (40) are respectively two groups, each group is four, the two groups of slag scraping sheets (40) are respectively positioned on two sides and the middle of two ends of the grate, the side slag scraping sheets (41) positioned on two sides are closely mounted with the furnace wall of the grate furnace, and the middle slag scraping sheets (42) positioned in the middle two groups and the side slag scraping sheets (41) positioned on two sides are transversely mounted on the same straight line of the grate; the slag breaking mechanism is positioned on one side, close to the driven roller (25), of the fire grate, the slag breaking mechanism comprises a hollow shaft (43), a hook hammer (44) and a driving device, the driving device comprises a slag breaking driving motor (45), the slag breaking driving motor (45) is connected with a slag breaking driving speed reducer (29) through a slag breaking driving belt pulley (28), the slag breaking driving speed reducer (29) is connected with a rotating shaft (30) through a chain wheel (31), and the hollow shaft (43) is fixedly sleeved in the middle of the rotating shaft (30); the hollow shaft (43) is provided with a plurality of groups of hook hammers (44).

5. A line for producing high grade direct process zinc oxide as claimed in claim 1 wherein: the agglomerate feeding system (15) further comprises a furnace door track (151) positioned on the side of the furnace door, a coal hopper (152) and a coal hopper track (153) are arranged on the side of the furnace door at one end of the grate furnace, the furnace door track (151) is connected with the coal hopper track (153), a coal hopper track support frame (154) is arranged on one side of the bottom of the coal hopper track (153), a feed car scraping plate (155) at one end is fixed on the coal hopper track support frame (154), a feed car scraping plate (155) at the other end is fixed on a feed car track (156), and a combined body of an agglomerate feed car (158) and a feed bottom plate car (157) is arranged on the two sets of feed car tracks (156) and is driven by rollers; the entire combination of the pellet feeder car (158) and the feed floor car (157) is placed on the base (32) by the feeder car track (156).

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