CN210237467U - Waste heat recovery system for producing semi-hydrated gypsum - Google Patents
Waste heat recovery system for producing semi-hydrated gypsum Download PDFInfo
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- CN210237467U CN210237467U CN201920115895.1U CN201920115895U CN210237467U CN 210237467 U CN210237467 U CN 210237467U CN 201920115895 U CN201920115895 U CN 201920115895U CN 210237467 U CN210237467 U CN 210237467U
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Abstract
The utility model discloses a waste heat recovery system for producing semi-hydrated gypsum, which comprises a feeding device, a drying device, a high-temperature impurity removal device, a calcining device and a cooling device which are connected in sequence; the drying device comprises a double-layer cyclone dust removal heat exchanger and a first heat return pipe connected to the double-layer cyclone dust removal heat exchanger, a first discharge pipe is arranged at the bottom of the double-layer cyclone dust removal heat exchanger and connected to a high-temperature impurity removal device, the high-temperature impurity removal device comprises an impurity removal furnace, a second heat return pipe connected to the impurity removal furnace and a second discharge pipe, the second heat return pipe is connected with the calcining device, and the second discharge pipe is connected with the calcining device; the calcining device comprises a phase change furnace and a third discharging pipe connected to the phase change furnace, and the third discharging pipe is connected to the cooling device. The utility model discloses collect processes such as drying, edulcoration, calcination, cooling with the gypsum as an organic whole to carry out reutilization with the waste gas waste heat that drying, edulcoration stage produced, improved the heat utilization of system, reduced manufacturing cost.
Description
Technical Field
The utility model relates to a gypsum production technical field, more specifically the waste heat recovery system who relates to a production hemihydrate gypsum that says so.
Background
At present, gypsum is calcium sulfate containing crystal water as a chemical component, and in daily life, gypsum is divided into natural mineral gypsum and chemical gypsum, wherein the natural gypsum is a mineral substance containing two crystal water, the chemical gypsum is a waste material generated in the production of chemical fertilizers and other chemical raw materials, and a byproduct generated in a desulfurization process is called desulfurized gypsum along with the improvement of the emission requirement of a coal-fired boiler; the waste gypsum generated in the production of chemical fertilizers and other phosphide is called phosphogypsum because of containing phosphorus oxide, and the application of the gypsum in building materials is mostly to calcine raw gypsum containing two crystal waters into gypsum containing half crystal water, commonly called hemihydrate gypsum; in the calcining process of the dihydrate gypsum, the gypsum is heated to 130-230 ℃ so that the gypsum contains free moisture and crystal water which are separated out and becomes the hemihydrate gypsum, thereby being applied to the field of buildings;
at present, most phosphogypsum processing and utilization adopt a phosphogypsum dryer, the principle is that the phosphogypsum is conveyed into the dryer, a flame-throwing furnace is arranged at the end part of the dryer, flame sprayed by the flame-throwing furnace is utilized to generate high-temperature airflow, and the phosphogypsum is heated and dried, so that the aim of gypsum structure conversion is achieved, but most of high temperature generated in the production process is lost.
Therefore, how to provide a semi-hydrated gypsum waste heat recovery system, which is a problem to be solved urgently by those skilled in the art to improve the heat utilization degree in the production process.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a waste heat recovery system for producing semi-hydrated gypsum comprises a feeding device, a drying device, a high-temperature impurity removal device, a calcining device and a cooling device which are sequentially connected;
the drying device comprises a double-layer cyclone dust removal heat exchanger and a first heat return pipe connected to the double-layer cyclone dust removal heat exchanger, a first discharge pipe is arranged at the bottom of the double-layer cyclone dust removal heat exchanger, and the first discharge pipe is connected to the high-temperature impurity removal device.
The high-temperature impurity removing device comprises an impurity removing furnace, and a second heat return pipe and a second discharge pipe which are connected to the impurity removing furnace, the second heat return pipe is connected with the calcining device, and the second discharge pipe is connected with the calcining device;
the calcining device comprises a phase change furnace and a third discharging pipe connected to the phase change furnace, and the third discharging pipe is connected to the cooling device.
Furthermore, the top of edulcoration stove, phase transition stove is provided with first feed inlet and second feed inlet respectively, first feed inlet with first discharging pipe intercommunication, the second feed inlet with the second discharging pipe intercommunication.
Furthermore, the top of the phase change furnace is also provided with a heat inlet, the heat inlet is connected with a blower, and an air inlet of the blower is respectively communicated with the first heat return pipe and the second heat return pipe.
Furthermore, the phase change furnace is also connected with a dust removal device, and the dust removal device comprises an induced draft fan and a dust remover connected with the induced draft fan.
Furthermore, the cooling device is a plate heat exchanger, a vertical heat transfer plate group is arranged in the plate heat exchanger, the plate heat exchanger is provided with a cold source inlet, a cold source outlet, a powder inlet and a powder outlet, the heat transfer plate group is composed of a plurality of hollow heat exchange plates connected in parallel, a cooling channel is formed in the space in each heat exchange plate, the cold source inlet and the cold source outlet are communicated with the heat exchange plates, a powder channel is formed in the space between each heat exchange plate and the adjacent heat exchange plate, and the third discharge pipe is connected into the powder inlet.
Furthermore, the bottom of the second discharge pipe is connected with a discharge bin.
Known through foretell technical scheme, compare with prior art, the utility model discloses following beneficial effect has:
1. the processes of drying, modifying, impurity removal, calcining, cooling and the like of the gypsum are integrated into a whole and are carried out step by step in a system, so that the heat energy is fully utilized, the heat exchange efficiency is high, and the energy is saved and the environment is protected;
2. waste gas waste heat generated in the drying and impurity removing stages is secondarily utilized, so that the heat utilization degree of the system is improved;
3. the double-layer cyclone dust removal heat exchanger performs heat exchange, and the heat which is exchanged and utilized is sent into the phase change furnace through the first heat return pipe by the blower for secondary utilization, so that the fuel consumption is reduced, the production cost is reduced, the temperature of the discharged gas is reduced, and the influence of greenhouse effect on the environment is reduced;
4. the calcining waste heat is fully utilized, and the heat transfer efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a waste heat recovery system for producing hemihydrate gypsum of the present invention.
Wherein:
1-a feeding device; 2-double-layer cyclone dust removal heat exchanger; 21-a first heat return pipe; 22-a first tapping pipe; 3-removing impurities from the furnace; 31-a second regenerative tube; 32-a second tapping pipe; 4-phase change furnace; 41-a third discharge pipe; 42-a blower; 5-a dust removal device; 51-an induced draft fan; 52-a dust remover; 6-a cooling device; 61-vertical heat transfer plate group; 62-cold source inlet; 63-cold source outlet; 7-discharging the material bin.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the embodiment of the utility model discloses a waste heat recovery system for producing semi-hydrated gypsum, which comprises a feeding device 1, a drying device, a high temperature impurity removing device, a calcining device and a cooling device 6 which are connected in sequence;
the feeding device can be a belt feeder or other feeding equipment, the drying device comprises a double-layer cyclone dust removal heat exchanger 2 and a first heat return pipe 21 connected to the double-layer cyclone dust removal heat exchanger, the first heat return pipe 21 is connected with the calcining device, a first discharge pipe 22 is arranged at the bottom of the double-layer cyclone dust removal heat exchanger 2, and the first discharge pipe 22 is connected with a high-temperature impurity removal device;
the high-temperature impurity removing device comprises an impurity removing furnace 3, and a second heat return pipe 31 and a second discharge pipe 32 which are connected to the impurity removing furnace 3, wherein the second heat return pipe 31 is connected with the calcining device, the second discharge pipe 32 is connected with the calcining device, and the bottom of the second discharge pipe 32 is connected with a material discharging bin 7, so that waste materials can be timely discharged when the system is possibly blocked (in a normal condition, the material discharging bin 7 is not communicated with the second discharge pipe 32);
the calcining device comprises a phase change furnace 4 and a third discharging pipe 41 connected to the phase change furnace, wherein the third discharging pipe 41 is connected with a cooling device;
the cooling device 6 is arranged as a plate heat exchanger, a vertical heat transfer plate group 61 is arranged in the plate heat exchanger, the plate heat exchanger is provided with a cold source inlet 62, a cold source outlet 63, a powder inlet and a powder outlet, the heat transfer plate group 61 is composed of a plurality of hollow heat exchange plates connected in parallel, a cooling channel is formed in the space in each heat exchange plate, the cold source inlet 62 and the cold source outlet 63 are communicated with the heat exchange plates, a powder channel is formed in the space between each heat exchange plate and the adjacent heat exchange plate, and the third discharge pipe 41 is connected into the powder inlet.
Specifically, the tops of the impurity removing furnace 3 and the phase change furnace 4 are respectively provided with a first feeding hole and a second feeding hole, the first feeding hole is communicated with a first discharging pipe 22, and the second feeding hole is communicated with a second discharging pipe 32; the top of the phase change furnace 4 is also provided with a heat inlet, the heat inlet is connected with a blower 42, and the air inlet of the blower 42 is respectively communicated with the first heat return pipe 21 and the second heat return pipe 31.
In some embodiments, the phase change furnace 4 is further connected with a dust removing device 5, and the dust removing device 5 comprises an induced draft fan 51 and a dust remover 52 connected with the induced draft fan.
The working process of the utility model is that the phosphogypsum mixed with alkaline neutralizer is evenly sent into a drying device by a belt feeder (or other feeding devices) (when processing blocky phosphogypsum, the phosphogypsum can be mechanically scattered firstly), the temperature is increased to promote the neutralization reaction to be full (removing part of soluble phosphorus [ fluorine ]), the phosphogypsum without surface water enters a double-layer cyclone dust removal heat exchanger 2 and is sent into an impurity removing furnace 3 through a first discharging pipe at the lower part, the high-temperature waste gas from the cyclone separator 2 enters a phase change furnace 4 through a first heat return pipe 21 for secondary utilization, the high-temperature gas after high-temperature impurity removal enters a phase change furnace 4 through a second heat return pipe 31 for secondary utilization, the dihydrate phosphogypsum obtained by treatment of the impurity removing furnace 3 enters a phase change furnace 4 through a second discharging pipe 32 for calcination (the calcination temperature is 150 ℃ and 240 ℃), so that 1 half of crystal water is removed from the dihydrate phosphogypsum, the dihydrate phosphogypsum is changed into building gypsum powder (CaSO 4. 1/2H2O) mainly based on β phases, the phenomenon of anhydrous anhydrite powder is avoided from the phenomenon, the cooling device enters a cooling device, and the cooling device to obtain the phosphogypsum through a cooling medium in a mode of a cooling plate sheet bar from the top to the top and the cooling of the cooling device, and the phosphogypsum, the cooling medium in the cooling process of the cooling device.
In the operation process, the cooling device 6 is in a standing state, no moving part is arranged except a discharging device at the bottom, dust and material degradation phenomena are not generated when materials move slowly, the cost is low, the energy consumption is low, no dust is generated, and compared with a process using a medium (such as gas) for cooling, the energy consumption is reduced by about 90%. The material enters the cooling device 6 from the upper powder inlet, is subjected to heat exchange and cooling, and is finally discharged from the bottom of the plate heat exchanger at the temperature of 0-80 ℃.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. The waste heat recovery system for producing the semi-hydrated gypsum is characterized by comprising a feeding device (1), a drying device, a high-temperature impurity removal device, a calcining device and a cooling device which are sequentially connected;
the drying device comprises a double-layer cyclone dust removal heat exchanger (2) and a first heat return pipe (21) connected to the double-layer cyclone dust removal heat exchanger (2), the first heat return pipe (21) is connected with the calcining device, a first discharge pipe (22) is arranged at the bottom of the double-layer cyclone dust removal heat exchanger (2), and the first discharge pipe is connected to the high-temperature impurity removal device;
the high-temperature impurity removing device comprises an impurity removing furnace (3), and a second heat return pipe (31) and a second discharge pipe (32) which are connected to the impurity removing furnace (3), wherein the second heat return pipe (31) is connected with the calcining device, and the second discharge pipe (32) is connected with the calcining device;
the calcining device comprises a phase change furnace (4) and a third discharging pipe (41) connected to the phase change furnace, and the third discharging pipe (41) is connected to the cooling device;
the top of the phase change furnace (4) is also provided with a heat inlet, the heat inlet is connected with a blower (42), and an air inlet of the blower (42) is respectively communicated with the first heat return pipe (21) and the second heat return pipe (31);
the top of edulcoration stove (3), phase transition stove (4) is provided with first feed inlet and second feed inlet respectively, first feed inlet with first discharging pipe (22) intercommunication, the second feed inlet with second discharging pipe (32) intercommunication.
2. The waste heat recovery system for producing hemihydrate gypsum according to claim 1, wherein the phase change furnace (4) is further connected with a dust removal device (5), and the dust removal device (5) comprises an induced draft fan (51) and a dust remover (52) connected with the induced draft fan.
3. The waste heat recovery system for producing hemihydrate gypsum according to claim 1, wherein the cooling device (6) is a plate heat exchanger, a vertical heat transfer plate group (61) is arranged in the plate heat exchanger, the plate heat exchanger is provided with a cold source inlet (62), a cold source outlet (63), a powder inlet and a powder outlet, the heat transfer plate group (61) is composed of a plurality of hollow heat exchange plates connected in parallel, cooling channels are formed in spaces in the heat exchange plates, the cold source inlet (62) and the cold source outlet (63) are communicated with the heat exchange plates, a powder channel is formed in a space between each heat exchange plate and an adjacent heat exchange plate, and the third discharge pipe (41) is connected to the powder inlet.
4. A waste heat recovery system for producing hemihydrate gypsum according to claim 1, characterized in that a discharge bin (7) is connected to the bottom of the second discharge pipe (32).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920115895.1U CN210237467U (en) | 2019-01-23 | 2019-01-23 | Waste heat recovery system for producing semi-hydrated gypsum |
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| CN201920115895.1U CN210237467U (en) | 2019-01-23 | 2019-01-23 | Waste heat recovery system for producing semi-hydrated gypsum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233802A (en) * | 2020-06-03 | 2021-08-10 | 山东天力能源股份有限公司 | Integrated processing device for compound |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233802A (en) * | 2020-06-03 | 2021-08-10 | 山东天力能源股份有限公司 | Integrated processing device for compound |
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