CN100434381C - Semi-hydrated gypsum calcination system and preparation process thereof - Google Patents
Semi-hydrated gypsum calcination system and preparation process thereof Download PDFInfo
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- CN100434381C CN100434381C CNB200610069006XA CN200610069006A CN100434381C CN 100434381 C CN100434381 C CN 100434381C CN B200610069006X A CNB200610069006X A CN B200610069006XA CN 200610069006 A CN200610069006 A CN 200610069006A CN 100434381 C CN100434381 C CN 100434381C
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Abstract
The present invention provides one kind of semi-hydrated gypsum calcining system and preparing process. The semi-hydrated gypsum calcining system includes a gypsum weighing and mixing and speed regulating belt, a double screw feeding machine, a rotary calcining furnace, a pulse bag dust collector, a dusting draught fan, a screw conveyer, a bucket type elevator, a cooling screw conveyer, a rotary cooling furnace, an air filter and a cooling draught fan. The semi-hydrated gypsum preparing process includes mixing natural gypsum and desulfurized gypsum to form mixed gypsum, heating the mixed gypsum inside the rotary calcining furnace with the heat exchange pipe to eliminate surface free water and crystallized water to form semi-hydrated gypsum, cooling and discharging. The present invention has the features of high heat efficiency, stable running, high product quality, etc.
Description
Technical field
The present invention relates to the calcining process and the calcination system thereof of semi-hydrated gypsum, belong to the preparing technical field of semi-hydrated gypsum.
Background technology
Gypsum generates semi-hydrated gypsum (CaSO after certain temperature calcining or boiling
40.5H
2O), have light weight, fire resistance is good, decorate properties is good, the sound-insulating performance is good, reprocessing make characteristics such as performance is good again, be widely used in gypsum plaster, building gypsum products, industrial mould and artistic model etc.Using more gypsum calcination equipment both at home and abroad at present is frying pan, rotary kiln, fluidizing furnace etc.Frying pan is divided into intermittently frying pan and continuous frying pan etc.Intermittently frying pan is because of can't continuous production, so shortcoming such as existence yields poorly, the product performance instability between the every batch of material, every pot of material, and gap is bigger.Though the continuity frying pan can continuous production, require the fineness of raw material must reach the fineness of the finished product on the technology, thereby the milling equipment of front is had relatively high expectations.Rotary kiln is divided into direct-heating type and indirect heating type, and in the direct-heating type rotary kiln, thermal source directly contacts with raw material, for guaranteeing the quality of product, reduces foreign matter content, just needs to improve the requirement to thermal source, adopts the higher thermal source of cleanliness factor as far as possible.Adopt the indirect heating type rotary kiln, thermal source is given the kiln wall by conducting heat, and the raw material in the kiln is heated again, and certainly will make thermo-efficiency low.The thermo-efficiency of fluidizing furnace is than the height of frying pan and rotary kiln, but this equipment requirements uses the gas with certain pressure to make material be the boiling shape, and reach certain fluidizing velocity, therefore will cause certain energy consumption in this respect, the dust amount of carrying when discharging because of this portion gas simultaneously is bigger, so load of dust remove is higher, the dust removal installation investment is big.
Summary of the invention
The present invention is directed to the deficiency that existing above-mentioned various semi-hydrated gypsum calciners exist, a kind of thermo-efficiency height, stable, semi-hydrated gypsum calcination system that operating maintenance is easy are provided, and the semi-hydrated gypsum reparation technology that adopts this system.
Semi-hydrated gypsum calcination system of the present invention comprises desulfurated plaster weigh belt, mixed gypsum weighing speed-governing belt, double-spiral feeder, rotary calcining stove, drain tank, pulsed jet cloth filter, dedusting induced draft fan, worm conveyor, bucket elevator, cooling spiral transfer roller, revolution cool furnace, air filter and cooling induced draft fan; The desulfurated plaster weigh belt is arranged on the top of mixed gypsum weighing speed-governing belt, and mixed gypsum weighing speed-governing belt is arranged on the top of double-spiral feeder; Double-spiral feeder is connected with the opening for feed of rotary calcining stove, is provided with heat transfer tube in the rotary calcining stove, and heat transfer tube is connected with vapour line, and vapour line is provided with reducing valve; The discharge port below of rotary calcining stove is provided with the discharging scraper plate; Drain tank is connected with the condensation-water drain of rotary calcining stove; Pulsed jet cloth filter is connected with the air outlet of rotary calcining stove; The dedusting induced draft fan is connected with pulsed jet cloth filter; Worm conveyor is arranged on the below of pulsed jet cloth filter and is connected with calcining furnace discharging scraper plate; Bucket elevator is connected with the discharging scraper plate, and its exit end is connected with the cooling spiral transfer roller; The cooling spiral transfer roller links to each other with revolution cool furnace opening for feed, and the discharge gate below of revolution cool furnace is provided with finished product and carries scraper plate; Air filter is connected with revolution cool furnace blast inlet, and the cooling induced draft fan is connected between revolution cool furnace air outlet and the rotary calcining stove blast inlet.
Heat transfer tube in the rotary calcining stove is arranged with the 2-4 circle in the concentric(al) circles mode.Heat transfer tube is wound with the spirrillum fin outward, and is tall and big in pitch and wing height near the discharge end fin at pitch and wing near the fin of feed end.
Adopt the flow process of the semi-hydrated gypsum reparation technology of above-mentioned semi-hydrated gypsum calcination system to be:
The plaster of paris is delivered on the mixed gypsum weighing speed-governing belt, take by weighing a certain amount of desulfurated plaster with the desulfurated plaster weigh belt, and be transported on the mixed gypsum weighing speed-governing belt and form mixed gypsum, the weight of the plaster of paris accounts for 90% of mixed gypsum, and the weight of desulfurated plaster accounts for 10% of mixed gypsum; After mixed gypsum weighing speed-governing belt is weighed adjusting, a certain amount of mixed gypsum is sent in the rotary calcining stove by double-spiral feeder; Saturation steam is decompressed to 0.8-1.0MPa through reducing valve, feeds in the heat transfer tube in the rotary calcining stove, and steam carries out contact heat-exchanging by heat transfer tube tube wall and mixed gypsum raw material, removes surperficial free-water and crystal water, forms semi-hydrated gypsum; Semi-hydrated gypsum product after the calcining is discharged from rotary calcining furnace discharge end, sends in the revolution cool furnace through calcining furnace discharging scraper plate, bucket elevator, cooling spiral transfer roller and cools off, and is cooled to 70-80 ℃; Cooled semi-hydrated gypsum product is carried scraper plate output by finished product; The air of discharging cool furnace enters in the rotary calcining machine under the effect of cooling induced draft fan, carries the water vapor that produces in the gypsum calcination process and is discharged by the air outlet of rotary calcining furnace discharge end; The dust that wherein carries is collected by pulsed jet cloth filter, sends into calcining furnace discharging scraper plate through the worm conveyor of its below, and the product that goes out with the rotary calcining fire grate together enters refrigerating work procedure; Gas after the dedusting is by the emptying of dedusting induced draft fan.
Semi-hydrated gypsum calcination system of the present invention adopts the indirect heat exchange form of steam as thermal source, and thermal source does not directly contact with raw material, can not pollute product, has guaranteed quality product.Feed the interior gas of rotary calcining stove as just the humid gas of taking of taking away the calcining water vapor, so institute's air demand is little, the gas speed in the rotary calcining stove is very low, and it is few to carry Dust Capacity, has reduced the load of dust removal installation, has reduced the cost of investment of dust removal installation.Calcining furnace is employed to be taken humid gas and is the warm air after the cooler preheating, and the heat that has been consumed in the rotary calcining stove when having avoided direct use freezing air has improved the heat utilization efficiency of rotary calcining stove.The present invention has thermo-efficiency height, stable, characteristics that operating maintenance is easy.Adopt the semi-hydrated gypsum reparation technology of above-mentioned semi-hydrated gypsum calcination system to have characteristics stable, reliable product quality simultaneously.
Description of drawings
Fig. 1 is the composition synoptic diagram of semi-hydrated gypsum calcination system of the present invention.
Fig. 2 is the cross sectional representation of the rotary calcining stove among the present invention.
Fig. 3 is the structural representation of the heat transfer tube of rotary calcining stove among the present invention.
Among the figure: 1, plaster of paris kiln hood storehouse, 2, desulfurated plaster kiln hood storehouse, 3, the desulfurated plaster weigh belt, 4, mixed gypsum weighing speed-governing belt, 5, double-spiral feeder, 6, the rotary calcining stove, 7, pulsed jet cloth filter, 8, the dedusting induced draft fan, 9, worm conveyor, 10, the discharging scraper plate, 11, bucket elevator, 12, the cooling spiral transfer roller, 13, the revolution cool furnace, 14, air filter, 15, finished product is carried scraper plate, 16, the cooling induced draft fan, 17, drain tank, 18, reducing valve, 19, heat transfer tube, 20, coarse pitch, the big high fin of wing, 21, fine pitch, the fin that winglet is high, 22, condensing tubule not, 23, the calcining furnace cylindrical shell, 24, pipe support supports.
Embodiment
Fig. 1 has provided the composition synoptic diagram of semi-hydrated gypsum calcination system of the present invention.This system comprises desulfurated plaster weigh belt 3, mixed gypsum weighing speed-governing belt 4, double-spiral feeder 5, rotary calcining stove 6, drain tank 17, pulsed jet cloth filter 7, dedusting induced draft fan 8, worm conveyor 9, bucket elevator 11, cooling spiral transfer roller 12, revolution cool furnace 13, air filter 14 and cooling induced draft fan 16.Desulfurated plaster weigh belt 3 places the top of mixed gypsum weighing speed-governing belt 4, and the plaster of paris is weighed in proportion with desulfurated plaster and then mixed on mixed gypsum weighing speed-governing belt 4.Mixed gypsum weighing speed-governing belt 4 places the top of double-spiral feeder 5, and mixed gypsum is imported in the double-spiral feeder 5.Double-spiral feeder 5 is connected with the opening for feed of rotary calcining stove 6, mixed gypsum is imported rotary calcining stove 6 interior contacts with heat transfer tube calcine.Shown in the cross sectional representation of the rotary calcining stove 6 that provides as Fig. 2, be provided with the 2-4 circle heat transfer tube of arranging in the concentric(al) circles mode 19 in the rotary calcining stove 6, these concentric(al) circless are the center of circle with calcining furnace cylindrical shell 23, be provided with not condensing tubule 22 in the every heat transfer tube, the every heat transfer tube 19 outer spirrillum fins that all are wound with are to increase heat interchanging area.Each heat transfer tube supports 24 by pipe support and fixes.As shown in Figure 3, at the different positions place of heat transfer tube 19, its fin form difference, higher near the charging opening end because of material water ratio, hang on the tube wall for preventing material, adopt coarse pitch, the big high fin 20 of wing; And near discharge end, because of the water ratio of material reduces, viscosity reduces, thus can adopt fine pitch, fin 21 that winglet is high, to increase heat interchanging area, enhancing heat exchange effect.Heat transfer tube 19 is connected with vapour line, and vapour line is provided with reducing valve 18.The discharge gate below of rotary calcining stove 6 is provided with calcining furnace discharging scraper plate 10.Drain tank 17 is connected with the condensation-water drain of rotary calcining stove 6.Pulsed jet cloth filter 7 links to each other with the air outlet of rotary calcining stove 6, and dedusting induced draft fan 8 is connected with pulsed jet cloth filter 7.Worm conveyor 9 places the below of pulsed jet cloth filter 7 and is connected with discharging scraper plate 10.Bucket elevator 11 is connected with discharging scraper plate 10, and its exit end is connected with cooling spiral transfer roller 12; Cooling spiral transfer roller 12 links to each other with the opening for feed of revolution cool furnace 13, and the discharge gate below of revolution cool furnace 13 is provided with finished product and carries scraper plate 15; Air filter 14 is connected with the blast inlet of revolution cool furnace 13, and cooling induced draft fan 16 is connected between the blast inlet of the air outlet that turns round cool furnace 13 and rotary calcining stove 6.
Rotary calcining stove 6 is furnished with speed regulation device, makes the rotating speed of calcining furnace adjustable within the specific limits, the use needs when satisfying conditions such as steam, raw material and changing.
Calcination product is temperature required can regulate by the steam regulation flow.The water of condensation that vapor condensation produces with the rotation of rotary calcining stove 6, is discharged rotary calcining stove 6 under the gradient effect of rotary calcining stove 6, enter drain tank 17.After water of condensation reached certain liquid level in the drain tank 17, water discharging valve was opened, and water of condensation is entered the water of condensation house steward.In the operational process of rotary calcining stove 6, the not condensed gas that produces in the heat transfer tube is drained among the outer not condensing house steward of body of heater by the not condensing tubule 22 in the every heat transfer tube, and discharging regularly.
Total system adopts PLC to control automatically, has improved the level of automation and the operation stability of system operation, has reduced labour intensity.
Adopt the flow process of the semi-hydrated gypsum reparation technology of above-mentioned semi-hydrated gypsum calcination system to be:
The plaster of paris in the plaster of paris kiln hood storehouse 1 drops on the mixed gypsum weighing speed-governing belt 4, from desulfurated plaster kiln hood storehouse 2, weigh up a certain amount of desulfurated plaster with desulfurated plaster weigh belt 3, and be transported on the mixed gypsum weighing speed-governing belt 4 and form mixed gypsum, the weight of the plaster of paris accounts for 90% of mixed gypsum, and the weight of desulfurated plaster accounts for 10% of mixed gypsum.After mixed gypsum weighing speed-governing belt 4 is weighed adjusting, a certain amount of mixed gypsum is sent in the rotary calcining stove 6 by double-spiral feeder 5.Saturation steam is decompressed to 0.8-1.0MPa through reducing valve 18, feeds in the heat transfer tube 19 in the rotary calcining stove 6.Steam carries out contact heat-exchanging by heat transfer tube tube wall and mixed gypsum raw material, removes surperficial free-water and crystal water, forms semi-hydrated gypsum.Semi-hydrated gypsum product after the calcining is discharged from rotary calcining stove 6 discharge ends, sending into revolution through discharging scraper plate 10, bucket elevator 11, cooling spiral transfer roller 12 cools off in the cool furnace 13, be cooled to 70-80 ℃, cooled semi-hydrated gypsum product is carried scraper plate 15 outputs by finished product.
Natural air is after air filter 14 filters, at first enter in the revolution cool furnace 13, high temperature semi-hydrated gypsum product is cooled off, the air of discharging cool furnace has certain temperature, under the effect of cooling induced draft fan 16, enter in the rotary calcining stove 6,, carry the water vapor that produces in the gypsum calcination process and discharge by the air outlet of rotary calcining stove 6 discharge ends as taking humid gas.The low amounts of dust of wherein carrying is collected by pulsed jet cloth filter 7, and the worm conveyor 9 below it is sent into the discharging scraper plate 10 of rotary calcining stove 6 back, and the product of discharging with rotary calcining stove 6 together enters refrigerating work procedure.Gas after the dedusting is by 8 emptyings of dedusting induced draft fan.
Claims (4)
1, a kind of semi-hydrated gypsum calcination system comprises desulfurated plaster weigh belt, mixed gypsum weighing speed-governing belt, double-spiral feeder, rotary calcining stove, drain tank, pulsed jet cloth filter, dedusting induced draft fan, worm conveyor, bucket elevator, cooling spiral transfer roller, revolution cool furnace, air filter and cooling induced draft fan; It is characterized in that: the desulfurated plaster weigh belt is arranged on the top of mixed gypsum weighing speed-governing belt, and mixed gypsum weighing speed-governing belt is arranged on the top of double-spiral feeder; Double-spiral feeder is connected with the opening for feed of rotary calcining stove, is provided with heat transfer tube in the rotary calcining stove, and heat transfer tube is connected with vapour line, and vapour line is provided with reducing valve; The discharge port below of rotary calcining stove is provided with the discharging scraper plate; Drain tank is connected with the condensation-water drain of rotary calcining stove; Pulsed jet cloth filter is connected with the air outlet of rotary calcining stove; The dedusting induced draft fan is connected with pulsed jet cloth filter; Worm conveyor is arranged on the below of pulsed jet cloth filter and is connected with calcining furnace discharging scraper plate; Bucket elevator is connected with the discharging scraper plate, and its exit end is connected with the cooling spiral transfer roller; The cooling spiral transfer roller links to each other with revolution cool furnace opening for feed, and the discharge gate below of revolution cool furnace is provided with finished product and carries scraper plate; Air filter is connected with revolution cool furnace blast inlet, and the cooling induced draft fan is connected between revolution cool furnace air outlet and the rotary calcining stove blast inlet.
2, semi-hydrated gypsum calcination system according to claim 1 is characterized in that: the heat transfer tube in the described rotary calcining stove is arranged with the 2-4 circle in the concentric(al) circles mode.
3, semi-hydrated gypsum calcination system according to claim 1 is characterized in that: the heat transfer tube in the described rotary calcining stove is wound with the spirrillum fin outward, and is tall and big in pitch and wing height near the discharge end fin at pitch and wing near the fin of feed end.
4, a kind of semi-hydrated gypsum reparation technology that adopts the described semi-hydrated gypsum calcination system of claim 1, it is characterized in that: the flow process of this technology is: the plaster of paris is delivered on the mixed gypsum weighing speed-governing belt, take by weighing a certain amount of desulfurated plaster with the desulfurated plaster weigh belt, and be transported on the mixed gypsum weighing speed-governing belt and form mixed gypsum, the weight of the plaster of paris accounts for 90% of mixed gypsum, and the weight of desulfurated plaster accounts for 10% of mixed gypsum; After mixed gypsum weighing speed-governing belt is weighed adjusting, a certain amount of mixed gypsum is sent in the rotary calcining stove by double-spiral feeder; Saturation steam is decompressed to 0.8-1.0MPa through reducing valve, feeds in the heat transfer tube in the rotary calcining stove, and steam carries out contact heat-exchanging by heat transfer tube tube wall and mixed gypsum raw material, removes surperficial free-water and crystal water, forms semi-hydrated gypsum; Semi-hydrated gypsum product after the calcining is discharged from rotary calcining furnace discharge end, sends in the revolution cool furnace through calcining furnace discharging scraper plate, bucket elevator, cooling spiral transfer roller and cools off, and is cooled to 70-80 ℃; Cooled semi-hydrated gypsum product is carried scraper plate output by finished product; The air of discharging cool furnace enters in the rotary calcining stove under the effect of cooling induced draft fan, carries the water vapor that produces in the gypsum calcination process and is discharged by the air outlet of rotary calcining furnace discharge end; The dust that wherein carries is collected by pulsed jet cloth filter, sends into calcining furnace discharging scraper plate through the worm conveyor of its below, and the product that goes out with the rotary calcining fire grate together enters refrigerating work procedure; Gas after the dedusting is by the emptying of dedusting induced draft fan.
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| CN112279536B (en) * | 2020-11-05 | 2022-06-17 | 江苏鹏威重型设备有限公司 | Production process of industrial byproduct gypsum |
| CN113292262A (en) * | 2021-05-20 | 2021-08-24 | 四川善盛宏林科技有限公司 | Phosphogypsum calcining system |
| CN115180852B (en) * | 2022-06-23 | 2023-08-18 | 章丘市云龙机械有限公司 | Rotary type drying and calcining integrated device for desulfurized gypsum |
| CN115446074B (en) * | 2022-09-20 | 2023-08-04 | 北新集团建材股份有限公司 | Three-control dust collection ash comprehensive utilization system |
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