CN113149486B - Gypsum calcining method - Google Patents
Gypsum calcining method Download PDFInfo
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- CN113149486B CN113149486B CN202110318090.9A CN202110318090A CN113149486B CN 113149486 B CN113149486 B CN 113149486B CN 202110318090 A CN202110318090 A CN 202110318090A CN 113149486 B CN113149486 B CN 113149486B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/0285—Rotary kilns
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
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Abstract
The application discloses gypsum calcination method uses the gypsum calcination system, and the gypsum calcination system includes consecutive material feeding unit, gypsum calcination device, fluidized bed furnace cooler and grinding device, the gypsum calcination device includes the rotary kiln and sets up the double helix feeder of rotary kiln front end, the front end of double helix feeder links to each other with the material feeding unit who carries the gypsum raw materials, be provided with the feed back mouth on the rotary kiln, the feed back mouth through circulating conveyer with the front end of double helix feeder links to each other, and the gypsum calcination method includes following step: feeding gypsum raw materials into a rotary kiln through a double-screw feeder by a feeding device for drying and calcining; the middle feed back in the rotary kiln enters the front end of the double-helix feeding machine through a feed back port and a circulating conveying device; feeding the gypsum powder calcined in the rotary kiln into a fluidized bed furnace cooler for cooling; and sending the cooled gypsum powder into a grinding device for grinding.
Description
Technical Field
The application relates to but is not limited to the field of gypsum production, in particular to a gypsum calcination method.
Background
In the calcining process of the gypsum, the drying and calcining of the materials in the rotary kiln are finished in the same equipment, and the process is simple and compact. However, since the desulfurized gypsum raw material contains a certain amount of free water and Cl-，SO42-The plasma corrodes pipelines and supports seriously, and directly influences the service life of equipment. Meanwhile, equipment such as a subsequent dust collector and the like can be seriously corroded due to higher humidity in the rotary kiln.
Disclosure of Invention
The embodiment of the application provides a gypsum calcining method which can reduce corrosion to equipment such as a rotary kiln in the gypsum calcining process.
The embodiment of the application provides a gypsum calcining method, which uses a gypsum calcining system,
the gypsum calcining system comprises a feeding device, a gypsum calcining device, a fluidized bed furnace cooler and a grinding device which are sequentially connected, wherein the gypsum calcining device comprises a rotary kiln and a double-screw feeder arranged at the front end of the rotary kiln, the front end of the double-screw feeder is connected with the feeding device for conveying gypsum raw materials, a feed back port is arranged on the rotary kiln and is connected with the front end of the double-screw feeder through a circulating conveying device,
the gypsum calcination method comprises the following steps:
feeding gypsum raw materials into a rotary kiln through a double-screw feeder by a feeding device for drying and calcining;
the middle feed back in the rotary kiln enters the front end of the double-helix feeder through a feed back hole and a circulating conveying device;
feeding the gypsum powder calcined in the rotary kiln into a fluidized bed furnace cooler for cooling;
and feeding the cooled gypsum powder into a grinding device for grinding.
Compared with the prior art, the method has the following beneficial effects:
according to the gypsum calcination method, the middle part of the rotary kiln is fed back to the double-screw feeder, and dry gypsum powder of the fed back is added into the double-screw feeder firstly, and then the wet desulfurization gypsum raw material is added. The dry gypsum powder added firstly avoids the direct contact between the wet desulfurized gypsum-containing raw material and equipment, and the free water content in the recycled dry gypsum powder is very low, so that the equipment is hardly chemically corroded; meanwhile, because the temperature of the returned material is higher (about 110 ℃), the wet desulfurization gypsum-containing raw material is heated in a double-screw feeder and is stirred and mixed with the wet desulfurization gypsum-containing raw material, so that the drying of the desulfurization gypsum-containing raw material is accelerated; greatly reduces the corrosion of the double-helix feeding machine and the rotary kiln.
Other features and advantages of the present application will be set forth in the description that follows.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
FIG. 1 is a schematic diagram of a calcination system used in a gypsum calcination process according to an embodiment of the present application.
Illustration of the drawings:
101-desulfurized gypsum hopper, 102-belt scale, 103-belt conveyor, 104-air locking discharger, 105-double-screw feeder, 106-rotary kiln, 107-star discharger, 108-star discharger, 109-zipper machine, 110-bucket elevator, 111-screw conveyor, 112-pneumatic gate valve, 113-rotary screen, 114-screw conveyor, 115-bucket elevator, 116-screw conveyor, 117-fluidized bed furnace cooler, 118-cooling fan, 119-electric butterfly valve, 120-electric butterfly valve, 121-roots fan, 122-electric butterfly valve, 123-three-way distributing valve, 124-ball mill, 125-screw conveyor, 126-heat regenerative fan, 127-heat exchanger, 128-electric butterfly valve, 201-dust collection negative pressure pipe, 202-dust collection negative pressure pipe, 203-cold air pipe, 204-cold air pipe, 301-saturated steam pipe, 302-condensate pipe, 303-high temperature condensate pipe, 304-low temperature condensate pipe, 401-first air supply outlet, 402-second air supply outlet, 403-return port.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the process of calcining the gypsum, along with the improvement of the environmental protection requirement, the coal-fired furnace is less and less, and the cost is higher by adopting natural gas as a heat source. Therefore, steam calcination processes are becoming increasingly widespread. Because the desulfurized gypsum raw material contains a certain amount of free water and Cl-，SO42-The plasma seriously corrodes the pipeline and the bracket at the feeding section of the equipment; meanwhile, equipment such as a subsequent dust collector and the like is seriously corroded due to high humidity in the atmosphere at the upper part of the rotary kiln.
The embodiment of the application provides a gypsum calcining method, a gypsum calcining system is used in the gypsum calcining method, the gypsum calcining system comprises a feeding device, a gypsum calcining device, a fluidized bed furnace cooler 117 and a grinding device which are connected in sequence, the gypsum calcining device comprises a rotary kiln 106 and a double-screw feeder 105 arranged at the front end of the rotary kiln 106, the front end of the double-screw feeder 105 is connected with the feeding device for conveying gypsum raw materials, a material return opening 403 is arranged on the rotary kiln 106, and the material return opening 403 is connected with the front end of the double-screw feeder 105 through a circulating conveying device. The gypsum calcination method comprises the following steps: the feeding device feeds the gypsum raw material into a rotary kiln 106 through a double-screw feeder 105 for drying and calcining; the middle feed back in the rotary kiln 106 enters the front end of the double-helix feeder 105 through a feed back hole 403 and a circulating conveying device; feeding the calcined gypsum powder of the rotary kiln 106 into a fluidized bed furnace cooler 117 for cooling; and sending the cooled gypsum powder into a grinding device for grinding.
According to the gypsum calcining method provided by the embodiment of the application, the middle part of the rotary kiln 106 is fed back to the double-screw feeder, so that the wet desulfurized gypsum raw material is prevented from being in direct contact with equipment, the chemical corrosion to the rotary kiln 106 and other equipment is reduced, and the practicability of the gypsum calcining method is improved. According to the gypsum calcining method provided by the embodiment of the application, the steam rotary kiln 106 is adopted for one-step drying and calcining of the desulfurized gypsum, the middle feed back of the rotary kiln 106 is accurately adjusted through the frequency conversion star-shaped discharger (the frequency conversion star-shaped discharger can carry out metering), and is conveyed to the front end of the double-screw feeder 105 through the zipper machine 109, the bucket elevator 110 and the screw conveyor 111, and then the desulfurized gypsum raw material inlet is sealed through the air locking discharger 104.
The feeding device comprises: the desulfurized gypsum hopper 101 is used for storing desulfurized gypsum and providing raw materials for the system; the belt weigher 102 is used for accurately measuring the feeding amount of the desulfurized gypsum; a belt conveyor 103 for conveying the raw material. The grinding device can adopt a ball mill. The circulating conveyor includes a zipper machine 109, a bucket elevator 110, and a screw conveyor 111 connected in sequence. The gypsum calcining apparatus employs a rotary kiln 106 with a middle portion fed back to a twin screw feeder 105, and dry gypsum powder (i.e., a middle feed back) is added first to the twin screw feeder 105, followed by the wet desulfurized gypsum-containing raw material. The dry gypsum powder added first forms a protective layer on the inner wall and the inner pipeline of the rotary kiln 106, so that the wet desulfurized gypsum-containing raw material is prevented from directly contacting with equipment, and the recycled dry gypsum powder has low free water content and hardly has chemical corrosion to the equipment; meanwhile, because the temperature of the feed back is higher (about 110 ℃), the wet desulfurization gypsum-containing raw material is heated in the double-screw feeder 105 and is stirred and mixed with the wet desulfurization gypsum-containing raw material, so that the drying of the desulfurization gypsum-containing raw material is accelerated; corrosion of the twin screw feeder 105 and the rotary kiln 106 is greatly reduced.
In an exemplary embodiment, as shown in FIG. 1, the feed inlet on the double screw feeder 105 for the intermediate feedback is located before the feed inlet on the double screw feeder 105 for the gypsum material.
The feed inlet of the intermediate feed back on the double-screw feeder 105 is located in front of the feed inlet of the gypsum raw material on the double-screw feeder 105, so as to ensure that the double-screw feeder 105 is not corroded by the gypsum raw material (or to greatly reduce the corrosion degree of the gypsum raw material on the double-screw feeder 105 and the like). Of course, the inlet of the intermediate feed back material on the twin screw feeder 105 may be the same inlet as the inlet of the gypsum material on the twin screw feeder 105 (i.e., the intermediate feed back material and the gypsum material enter the twin screw feeder 105 at the same inlet).
In an exemplary embodiment, as shown in FIG. 1, a first, forward section of the rotary kiln 106 is configured to dry the gypsum material, a second, rearward section of the rotary kiln 106 is configured to calcine the gypsum material, and a return opening 403 is located at the intersection of the first and second sections of the rotary kiln 106.
The material return port 403 is disposed at the boundary between drying and calcining to prevent the material return from caking due to the presence of more hemihydrate gypsum (i.e., calcined desulfurized gypsum) in the double screw feeder 105 when encountering free water in the desulfurized gypsum raw material, thereby preventing gypsum from accumulating on the inner wall and inner pipes of the rotary kiln 106.
In an exemplary embodiment, as shown in fig. 1, a dust collecting port is provided on the rotary kiln 106, and the rotary kiln 106 is connected to a dust collecting device through the dust collecting port, which is located above the feeding end of the rotary kiln 106.
The temperature of the material at the feed end of the rotary kiln 106 is low, and the drying intensity is severe, so the humidity in the atmosphere at the feed end is high. The dust collecting port of the rotary kiln 106 is arranged on the high-humidity side of the feeding port, so that generated water vapor can be discharged in time, high-humidity gas is prevented from penetrating through the rotary kiln 106, corrosion to the rotary kiln 106 is reduced, and the calcining quality is optimized.
In an exemplary embodiment, as shown in fig. 1, the rotary kiln 106 is further provided with a first air supply outlet 401 and a second air supply outlet 402, the first air supply outlet 401 and the second air supply outlet 402 are respectively arranged above the material return opening 403 and the rear end discharge opening of the rotary kiln 106, and the first air supply outlet 401 and the second air supply outlet 402 are connected with an air supply device through an air supply pipeline.
Preheated air is blown into the rotary kiln 106 from the middle discharge opening and the top of the end discharge opening (namely the first air supply opening 401 and the second air supply opening 402) respectively, so that micro-positive pressure can be formed locally in the rotary kiln 106, the discharge of the lower discharge opening is facilitated, and the mutual influence (negative pressure at the dust collection opening and positive pressure at the lower discharge opening) at the lower discharge opening and the dust collection opening is avoided.
In an exemplary embodiment, the rotary kiln 106 further includes a heat exchange pipe, a saturated steam pipe, and a condensate pipe, wherein high temperature steam enters the heat exchange pipe from the saturated steam pipe, exchanges heat with the gypsum raw material in the rotary kiln 106, and is changed into condensate water to be discharged from the condensate pipe.
The fire coal can not meet the existing environmental protection requirements; natural gas is used as a heat source, so that the cost is high; the rotary kiln 106 uses steam for calcination, so that the rotary kiln is environment-friendly and low in cost, and is beneficial to reducing the overall cost of gypsum calcination.
In an exemplary embodiment, the material of the feed end of the rotary kiln 106 is duplex stainless steel.
Because the desulfurized gypsum raw material contains a certain amount of free water and Cl-，SO42-Plasma corrodes pipelines and supports seriously at the feeding section of the equipment, the corrosion degree of the rotary kiln 106 is reduced by adopting the intermediate material return mode, and meanwhile, the heating pipeline and the supports at the feeding end of the rotary kiln 106 are made of duplex stainless steel 2205 or duplex stainless steel 2507, so that the corrosion resistance of the rotary kiln is greatly improved.
In an exemplary embodiment, the gypsum calcining system further comprises an air supply device, the air supply device comprises a back heating fan 126 and a heat exchanger 127 arranged at the rear end of the back heating fan 126, and condensed water discharged from a condensed water pipe enters the heat exchanger 127 to provide heat.
The air preheated by the heat recovery fan 126 is blown in, so that not only is the low-grade heat source (condensed water) generated in the system utilized, but also the heat is fully utilized, more importantly, the humidity of the atmosphere at the upper part of the rotary kiln 106 is reduced, and the corrosion of the rotary kiln 106 and subsequent dust collecting equipment is reduced.
In an exemplary embodiment, as shown in fig. 1, the gypsum calcining system further includes a terminal conveyor (screw conveyor 125), the outlet of the fluidized bed cooler 117 is connected to the pulverizing device and the terminal conveyor through the conveying pipes, respectively, and the outlet of the pulverizing device is connected to the terminal conveyor. The conveying pipeline is provided with a three-way material distributing valve 123, and the three-way material distributing valve 123 regulates the amount of the gypsum powder entering the grinding device from the fluidized bed furnace cooler 117 and the amount of the gypsum powder entering the tail end conveying device from the fluidized bed furnace cooler 117.
The calcined gypsum powder is cooled by a boiling cooler and then enters a three-way material distributing valve 123, and the three-way material distributing valve 123 can adjust the proportion of powder passing through a ball mill and powder not passing through the ball mill (namely the proportion of ground powder and unground powder), so that the gradation of gypsum powder is further optimized. The ground and unground gypsum powder is thoroughly mixed in the subsequent screw conveyor 125 and conveyed to subsequent equipment.
As shown in fig. 1, a calcining system used in a gypsum calcining method provided in the embodiment of the present application includes: the desulfurized gypsum hopper 101 is used for storing desulfurized gypsum and providing raw materials for the system; the belt scale 102 is used for accurately measuring the feeding amount of the desulfurized gypsum; a belt conveyor 103 for conveying the raw material; an air-locking discharger 104 is used for feeding and ensuring the double-screw feeder 105 and the rotary kiln 106 to be closed; a twin screw feeder 105 for stirring the raw material and feeding the rotary kiln 106; a rotary kiln 106 for drying and calcining the desulfurized gypsum; the star-shaped discharger 107 is used for discharging large-particle impurities and ensuring the rotary kiln 106 to be closed; the star-shaped discharger 108 is used for accurately controlling the middle discharge amount of the rotary kiln 106 through frequency conversion adjustment and ensuring the rotary kiln 106 to be closed; a zipper machine 109 for conveying gypsum powder; a bucket elevator 110 for elevating gypsum powder; a screw conveyor 111 for conveying gypsum powder; a pneumatic gate valve 112 for discharging gypsum powder when the subsequent conveying equipment of the system fails; the rotary screen 113 is used for screening gypsum powder and discharging impurities; a screw conveyor 114 for conveying gypsum powder; a bucket elevator 115 for elevating gypsum powder; a screw conveyor 116 for conveying gypsum powder; a boiling cooler 117 for cooling the gypsum powder; the cooling fan 118 is used for conveying cooling air and reducing the temperature of the gypsum powder; an electric butterfly valve 119 for controlling the blast volume entering the feed side of the boiling cooler 117 to ensure the stable fluidization of the feed side of the boiling furnace cooler; an electric butterfly valve 120 for controlling the amount of blast entering the discharge side of the fluidized cooler 117 to ensure stable fluidization at the discharge side of the fluidized bed cooler; a roots blower 121 for supplying high-pressure air required for fluidization to the boiling cooler 117; an electric butterfly valve 122 for controlling the dust collection air volume and ensuring the stable fluidization in the boiling cooler 117; the three-way material distributing valve 123 is used for adjusting the proportion of the powder passing through the ball mill 124 and not passing through the ball mill 124, namely the proportion of the ground powder and the unground powder, and optimizing the gradation of the gypsum powder; a ball mill 124 for grinding gypsum powder; a screw conveyor 125 for conveying and mixing the gypsum powder. And the heat return fan 126 is used for conveying air, heating the air by the heat exchanger 127 and blowing the air into the rotary kiln 106 to reduce the humidity in the atmosphere of the rotary kiln 106 and recover the heat of the condensed water 303 in the system. A heat exchanger 127 for heating the temperature of the air blown into the rotary kiln 106. And the electric butterfly valve 128 is used for controlling the dust collection air volume in the rotary kiln 106, ensuring the micro negative pressure of the rotary kiln 106 and avoiding the overflow of gypsum powder.
The desulfurized gypsum is metered in a desulfurized gypsum hopper 101 by a belt scale 102 and then enters a double-screw feeder 105 through a belt conveyor 103 and an air-locking discharger 104. The dried gypsum powder (i.e., intermediate feed back) of the rotary kiln 106 is subjected to variable frequency adjustment of the feed back amount by a star discharger 108, and is conveyed to a double-screw feeder 105 by a zipper 109, a bucket elevator 110 and a screw conveyor 111. The returned gypsum powder and the added desulfurized gypsum raw material are fully stirred and mixed by a double-screw conveyor 105, and then are conveyed to a rotary kiln 106 for drying and calcining. The large and light impurities enter the conical hopper at the feed end of the rotary kiln 106 along with the water vapor and are discharged through the star-shaped discharger 107. The cold air is preheated by the cold air pipe 204 and the heat recovery fan 126 through the heat exchanger 127, and then is blown into the upper parts of the middle discharge opening and the end discharge opening of the rotary kiln 106, and then carries the water vapor in the rotary kiln 106 and is connected to subsequent dust collecting equipment through the electric butterfly valve 128 and the dust collecting negative pressure pipe 201. When the subsequent conveying equipment of the rotary kiln 106 fails, the pneumatic gate valve 112 is opened to discharge the gypsum powder out of the system. The calcined gypsum powder is normally conveyed to a boiling cooler 117 through a rotary screen 113, a screw conveyor 114, a bucket elevator 115, and a screw conveyor 116, and cooled. High-pressure air is blown into the Roots blower 121, the air quantity on two sides is adjusted through the electric valve 119 and the electric valve 120, stable fluidization of gypsum powder is ensured together with the electric butterfly valve 122, and the electric butterfly valve 122 is connected with the dust collection negative pressure pipe 202. The cold air enters the fluidized bed furnace cooler 117 through the cold air pipe 203 and takes away the heat of the gypsum powder through the cooling fan 118, so that the gypsum powder is cooled. After the cooled gypsum powder is adjusted by a three-way material distributing valve 123, one part of the cooled gypsum powder enters a ball mill 124 for grinding, and the other part of the cooled gypsum powder directly enters a screw conveyor 125. The ground and unground landplaster are thoroughly mixed in the screw conveyor 125 and conveyed to subsequent equipment.
In the description of the present application, it should be noted that the term "plurality" refers to two or more, and the directions or positional relationships indicated by "upper", "lower", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the structures referred to have a specific direction, are constructed and operated in a specific direction, and thus, cannot be construed as limiting the present application.
In the description of the embodiments of the present application, unless expressly stated or limited otherwise, the terms "connected," "connected," and "mounted" are to be construed broadly, such that the terms "connected" and "connected" may be either fixedly, detachably, or integrally connected, for example; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The embodiments described herein are exemplary rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements that have been disclosed in this application may also be combined with any conventional features or elements to form unique aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other aspects to form another unique aspect as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
Claims (10)
1. A method for calcining gypsum is characterized in that a gypsum calcining system is used,
the gypsum calcining system comprises a feeding device, a gypsum calcining device, a fluidized bed furnace cooler and a grinding device which are sequentially connected, wherein the gypsum calcining device comprises a rotary kiln and a double-screw feeder arranged at the front end of the rotary kiln, the front end of the double-screw feeder is connected with the feeding device for conveying gypsum raw materials, a feed back port is arranged on the rotary kiln and is connected with the front end of the double-screw feeder through a circulating conveying device,
the gypsum calcination method comprises the following steps:
feeding gypsum raw materials into a rotary kiln through a double-screw feeder by a feeding device for drying and calcining;
the middle feed back in the rotary kiln enters the front end of the double-helix feeder through a feed back hole and a circulating conveying device;
feeding the gypsum powder calcined in the rotary kiln into a fluidized bed furnace cooler for cooling;
and sending the cooled gypsum powder into a grinding device for grinding.
2. A method as recited in claim 1, wherein said intermediate feed back is provided at an inlet on said twin screw feeder prior to a gypsum source being provided at an inlet on said twin screw feeder.
3. A gypsum calcination process according to claim 1, wherein a first, preceding section of the rotary kiln is arranged to dry the gypsum raw material and a second, succeeding section of the rotary kiln is arranged to calcine the gypsum raw material,
the feed back opening is positioned at the junction of the first section and the second section of the rotary kiln.
4. The gypsum calcination method as claimed in claim 1, wherein the rotary kiln is provided with a dust collecting port, the rotary kiln is connected with a dust collecting device through the dust collecting port,
the dust collecting port is positioned above the feeding end of the rotary kiln.
5. A gypsum calcination method according to claim 4, wherein the rotary kiln is further provided with a first air supply port and a second air supply port which are respectively provided above the return port and the rotary kiln rear end discharge port,
the first air supply outlet and the second air supply outlet are connected with an air supply device through an air supply pipeline.
6. The gypsum calcination method according to claim 5, wherein the rotary kiln further comprises a heat exchange tube, a saturated steam tube and a condensed water tube,
high-temperature steam enters the heat exchange tube from the saturated steam tube, is subjected to heat exchange with the gypsum raw material in the rotary kiln and then is changed into condensed water to be discharged through the condensed water tube.
7. The gypsum calcination method according to claim 4, wherein the material of the feed end of the rotary kiln is duplex stainless steel.
8. The gypsum calcination method according to claim 6, wherein the gypsum calcination system further comprises an air supply device including a regenerative fan and a heat exchanger disposed at a rear end of the regenerative fan,
and the condensed water discharged by the condensed water pipe enters the heat exchanger to provide heat.
9. The gypsum calcination method according to claim 1, wherein the gypsum calcination system further comprises a terminal conveyor, an outlet of the fluidized bed furnace cooler is connected to the pulverizing device and the terminal conveyor through a conveying line, respectively,
and the outlet of the grinding device is connected with the tail end conveying device.
10. A method for calcining gypsum according to claim 9, characterized in that a three-way distributing valve is arranged on the conveying pipeline,
the three-way distributing valve is used for adjusting the quantity of the gypsum powder entering the grinding device from the boiling furnace cooler and the quantity of the gypsum powder entering the tail end conveying device from the boiling furnace cooler.
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| CN202705248U (en) * | 2012-07-20 | 2013-01-30 | 息烽捷浪建材开发有限公司 | Coal-saving rotary kiln production line device for ardealite calcining |
| CN204240788U (en) * | 2014-11-14 | 2015-04-01 | 河北钢铁股份有限公司承德分公司 | Rotary kiln baiting device |
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