CN114276036B - Low-temperature calcining equipment for recycling industrial waste heat steam - Google Patents
Low-temperature calcining equipment for recycling industrial waste heat steam Download PDFInfo
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- CN114276036B CN114276036B CN202111592118.4A CN202111592118A CN114276036B CN 114276036 B CN114276036 B CN 114276036B CN 202111592118 A CN202111592118 A CN 202111592118A CN 114276036 B CN114276036 B CN 114276036B
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Abstract
The invention provides low-temperature calcining equipment for recycling industrial waste heat steam, which comprises a plurality of stages of calcining cylinders and a plurality of stages of heat exchange cylinders, wherein the calcining cylinders are accommodated in the heat exchange cylinders, the plurality of stages of calcining cylinders are connected in series end to end, the adjacent two stages of heat exchange cylinders are connected end to end through heat conduction pipes, each stage of calcining cylinder is also connected with one end of a heat return pipe, the other end of the heat return pipe is connected with a cyclone separator and then is connected with a first stage of calcining cylinder, and the head end of the last stage of heat exchange cylinder is also connected with steam source equipment through a steam supply pipe. By adopting the technical scheme of the invention, the gypsum slag is calcined at low temperature by utilizing the waste heat discharged by various industrial enterprises, and in the calcining process, the water vapor extracted from the gypsum slag is mixed into the vapor of the heat exchange cylinder and then exchanges heat with the gypsum slag, so that the gypsum slag is more fully calcined, the dehydration efficiency is improved, the three phases of gypsum powder tend to be stable through aging treatment, and the quality of gypsum powder is improved.
Description
Technical Field
The invention relates to the technical field of gypsum treatment processes, in particular to low-temperature calcining equipment for recycling industrial waste heat steam.
Background
The phosphogypsum is a chemical by-product which is generated by taking calcium sulfate as a main component in the process of preparing phosphoric acid by a wet method by taking phosphate rock as a raw material. Approximately five tons of phosphogypsum are produced simultaneously per ton of phosphoric acid produced. The phosphogypsum also contains undecomposed phosphorite and SiO 2 Alumina, ferric oxide, magnesium oxide, fluorine-containing substances, acidic insoluble organic matters and the like, which are harmful to human health and biological growth and influence the quality of phosphogypsum products; the main component in the phosphogypsum is CaSO 4 ·2H 2 And O, the water content in the phosphogypsum is high, the aim of the phosphogypsum calcining process is to fully remove water contained in the phosphogypsum, and the existing phosphogypsum calcining process equipment is the process and equipment of the traditional natural gypsum which are continuously used. For example, the rotary kiln calcination adopts a process of firstly burning and then grinding; the continuous frying pan, the conical frying pan, the fluidized bed furnace and the like adopt a process of grinding and then burning; grinding and burning machines, e.g. leatherExtra grinding followed by calcination. The key link of the devices is drying. The heat source for drying comes from a combustion device. Concurrent heating is generally used. The material that is usually to be dried is fed from a feed bin and is slid into the drum and then pushed back by the screw flight. Because the general rotary kiln is obliquely arranged, the materials flow to the rear end under the action of gravity and rotation on one hand, and on the other hand, the materials are repeatedly picked up by the shoveling plates and are brought to the upper end and then continuously spread, so that the materials form a uniform curtain in the cylinder and fully exchange heat with hot air in the cylinder. Because the materials are repeatedly raised and scattered, the contained moisture is gradually dried, thereby achieving the purpose of drying. The existing rotary kiln generally directly contacts the hot air of the calcining furnace with the gypsum slag, although the heat transfer efficiency is high, the flue gas easily pollutes the gypsum slag, the final product quality is difficult to ensure, the industrial waste heat recycling can save energy and reduce carbon emission, and the boosting carbon achieves peak carbon neutralization.
Disclosure of Invention
In order to solve the technical problem, the invention provides low-temperature calcining equipment for recycling industrial waste heat steam.
The invention is realized by the following technical scheme.
The invention provides low-temperature calcination equipment for recycling industrial waste heat steam, which comprises multiple levels of calcination cylinders and multiple levels of heat exchange cylinders, wherein the calcination cylinders of all levels correspond to the heat exchange cylinders of all levels one by one, the calcination cylinders are accommodated in the heat exchange cylinders, the multiple levels of calcination cylinders are connected in series end to end, the head end of a first level of calcination cylinder is used as a feeding port, the tail end of a last level of calcination cylinder is used as a discharging port, the adjacent two levels of heat exchange cylinders are connected end to end through heat conduction pipes, each level of calcination cylinder is also connected with one end of a heat return pipe, and the other end of the heat return pipe is connected with a cyclone separator and then is connected with the first level of calcination cylinder.
And the tail end of each calcining cylinder is also provided with a speed reducing motor.
The inner wall of each calcining cylinder is also provided with spiral teeth.
The low-temperature calcining equipment for recycling the industrial waste heat steam further comprises an aging tank, and a conveyor is arranged between the aging tank and the discharge hole.
The low-temperature calcining equipment for recycling the industrial waste heat steam further comprises a ball mill, and the ball mill is arranged between the discharge hole and the aging tank.
The conveyer is a spiral conveyer or a bucket elevator.
The head end of the last stage heat exchange cylinder is connected with a steam source device through a steam supply pipe.
The steam source equipment is a coal-fired boiler, an electric power boiler or industrial enterprise tail gas discharge equipment.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, tail gas, namely industrial waste heat, discharged by various industrial enterprises is fully utilized to carry out low-temperature calcination on gypsum slag, in the calcination process, steam fed into each stage of heat exchange cylinder through a steam supply pipe exchanges heat with gypsum slag in each stage of calcination cylinder respectively, water in the gypsum slag is gradually evaporated in each stage of calcination cylinder, the evaporated secondary steam is treated by a cyclone separator to be converted into hot-containing air flow, the hot-containing air flow is mixed into the calcination cylinder, heat energy carried in the hot-containing air flow can fully exchange heat with the gypsum slag, so that the gypsum slag is more fully calcined, the dehydration efficiency is higher, the calcination cylinder is driven to rotate by a speed reduction motor, the gypsum slag continuously rotates forwards along the axial direction in the calcination cylinder, the gypsum in the calcination cylinder is fully homogenized, the gypsum and the steam in the heat exchange cylinder are fully exchanged heat, further, the water in the gypsum slag is fully evaporated and removed, the dehydration efficiency is improved, in addition, the calcination cylinder is obliquely arranged relative to a horizontal plane, the gypsum slag is more convenient to be conveyed forwards, the calcination cylinder and the heat exchange cylinder are arranged from bottom to top, the space can be more effectively utilized, the yield of gypsum powder is improved, and the gypsum powder is more aged, and the yield of the gypsum powder is improved after being aged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a photograph showing a connecting structure of two adjacent calcining cylinders according to the present invention;
FIG. 3 is a photograph of a cyclone arrangement of the present invention;
FIG. 4 is a pictorial photograph of an aging tank of the present invention.
In the figure: 1-calcining cylinder, 2-heat exchange cylinder, 3-feeding port, 4-discharging port, 5-heat conduction pipe, 6-heat return pipe, 7-steam supply pipe, 8-induced draft fan, 9-speed reducing motor, 12-helical teeth, 13-aging tank, 14-ball mill, 15-conveyor, 16-cyclone separator and 17-steam condensation pipe.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in figure 1, the invention provides low-temperature calcination equipment for recycling industrial waste heat steam, which comprises multiple levels of calcination cylinders 1 and multiple levels of heat exchange cylinders 2, wherein each level of calcination cylinders 1 corresponds to each level of heat exchange cylinder 2 one by one, the calcination cylinders 1 are accommodated in the heat exchange cylinders 2, the multiple levels of calcination cylinders 1 are connected in series end to end, the head end of the first level of calcination cylinder 1 is used as a feeding port 3, the tail end of the last level of calcination cylinder 1 is used as a discharging port 4, the adjacent two levels of heat exchange cylinders 2 are connected end to end through heat conduction pipes 5, each level of calcination cylinder 1 is also connected with one end of a heat return pipe 6, and the other end of the heat return pipe 6 is connected with the tail end of the first level of calcination cylinder 2 after being connected with a cyclone separator. The low-temperature calcining equipment can be suitable for calcining industrial gypsum discharged in the production process of various chemical plants such as desulfurized gypsum, salt gypsum, titanium gypsum, citric acid gypsum and the like. The low-temperature calcination is carried out when the temperature in the calcination cylinder 6 is more than 100 ℃, preferably 140 ℃ to 180 ℃, the existing process technology for carrying out calcination treatment on the industrial gypsum product is generally high-temperature calcination with the temperature of more than 200 ℃, the energy required by high-temperature calcination is large, and the low-temperature calcination process technology for recycling industrial waste heat steam realizes low-temperature calcination within the range of 100 ℃ to 200 ℃, so that the energy consumption is reduced.
Furthermore, the tail end of each stage of the calcining cylinder 1 is also provided with a speed reducing motor 9. The inner wall of each calcining cylinder 1 is also provided with helical teeth 12. So that the industrial gypsum can move back and forth along the axial direction of the calcining cylinder 1 around the calcining cylinder 1 to realize the transportation, and the inclination angle between the axial direction of the calcining cylinder 1 and the horizontal plane can be adjusted properly. The industrial gypsum calcining device has the advantages that the industrial gypsum is enabled to move forwards under the axial rotation of the calcining cylinder 1 and the self sliding effect of the industrial gypsum when the calcining cylinder 1 moves forwards along the axial rotation of the calcining cylinder 1, the reduction of the power consumption of a speed reduction motor under the same condition is facilitated, in addition, the material conveying connection between the two adjacent calcining cylinders 1 is also facilitated, in addition, each calcining cylinder and each heat exchange cylinder can be also horizontally laid and arranged along the horizontal direction, wherein the gypsum guide pipe 5 between two stages can be made of rigid or flexible materials, for example, the heat conducting pipe 5 can be in rigid connection or flexible connection.
Furthermore, at least one stage of the calcining cylinder is also provided with a microwave generator. Through the quick heating effect in following the gypsum crystal of microwave, can make the crystal water in the industry gypsum crystal structure also deviate from fast to promote dehydration rate.
In addition, the low-temperature calcining equipment for recycling industrial waste heat steam further comprises an aging tank 13, and a conveyor 15 is arranged between the aging tank 13 and the discharge port 4. The low-temperature calcining equipment for recycling the industrial waste heat steam further comprises a ball mill 14, and the ball mill 14 is arranged between the discharge port 4 and the aging tank 13. The conveyor 15 is a screw conveyor or a bucket elevator.
In addition, the number of the calcining cylinders 1 and the heat exchange cylinders 2 is not limited, the head end of the last stage of heat exchange cylinder 2 is connected with steam source equipment through a steam supply pipe 7, and the steam source equipment is a coal-fired boiler, an electric power boiler or tail steam discharge equipment of industrial enterprises. The outer wall of the last calcining barrel 1 is also provided with an electric heating tube which is connected with an external power supply and used for supplementing, heating and calcining the gypsum slag in the calcining barrel 1 so as to fully and thoroughly remove water in the gypsum slag.
By adopting the technical scheme of the invention, tail gas, namely industrial waste heat, discharged by various industrial enterprises is fully utilized to carry out low-temperature calcination on gypsum slag, in the calcination process, steam fed into each stage of heat exchange cylinder through a steam supply pipe exchanges heat with gypsum slag in each stage of calcination cylinder respectively, water in the gypsum slag is gradually evaporated in each stage of calcination cylinder, the evaporated secondary steam is treated by a cyclone separator to be converted into hot-containing air flow, the hot-containing air flow is mixed into the calcination cylinder, heat energy carried in the hot-containing air flow can fully exchange heat with the gypsum slag, so that the gypsum slag is more fully calcined, the dehydration efficiency is higher, the calcination cylinder is driven to rotate by a speed reduction motor, the gypsum slag continuously rotates forwards along the axial direction in the calcination cylinder, the gypsum in the calcination cylinder is fully homogenized, the gypsum and the steam in the heat exchange cylinder are fully exchanged heat, further, the water in the gypsum slag is fully evaporated and removed, the dehydration efficiency is improved, in addition, the calcination cylinder is obliquely arranged relative to a horizontal plane, the gypsum slag is more convenient to be conveyed forwards, the calcination cylinder and the heat exchange cylinder are arranged from bottom to top, the space can be more effectively utilized, the yield of gypsum powder is improved, and the gypsum powder is more aged, and the yield of the gypsum powder is improved after being aged.
Claims (5)
1. The utility model provides an industry waste heat steam cyclic utilization low temperature calcination equipment which characterized in that: the device comprises multistage calcining cylinders (1) and multistage heat exchange cylinders (2), wherein each stage of calcining cylinder (1) corresponds to each stage of heat exchange cylinder (2) one by one, the calcining cylinders (1) are accommodated in the heat exchange cylinders (2), the multistage calcining cylinders (1) are connected in series end to end, wherein the head end of the first stage of calcining cylinder (1) is used as a feeding port (3), the tail end of the last stage of calcining cylinder (1) is used as a discharging port (4), the adjacent two stages of heat exchange cylinders (2) are connected end to end through a heat conduction pipe (5), each stage of calcining cylinder (1) is also connected with one end of a heat return pipe (6), and the other end of the heat return pipe (6) is connected with the first stage of calcining cylinder (1) after being connected into a cyclone separator;
the head end of the last stage of heat exchange cylinder (2) is also connected with steam source equipment through a steam supply pipe (7), the steam source equipment is a coal-fired boiler, an electric power boiler or industrial enterprise tail steam discharge equipment, and the temperature in the calcining cylinder (1) is 140-180 ℃; the inner wall of each calcining cylinder (1) is also provided with spiral teeth (12).
2. The industrial waste heat steam recycling low-temperature calcining equipment as claimed in claim 1, wherein: the tail end of each calcining cylinder (1) is also provided with a reducing motor (9).
3. The industrial waste heat steam recycling low-temperature calcining equipment as claimed in claim 1, characterized in that: the low-temperature calcining equipment for recycling the industrial waste heat steam further comprises an aging tank (13), and a conveyor (15) is arranged between the aging tank (13) and the discharge hole (4).
4. The industrial waste heat steam recycling low-temperature calcining equipment as claimed in claim 3, characterized in that: the low-temperature calcination equipment for recycling the industrial waste heat steam further comprises a ball mill (14), wherein the ball mill (14) is arranged between the discharge hole (4) and the aging tank (13).
5. The industrial waste heat steam recycling low-temperature calcining equipment as claimed in claim 3, characterized in that: the conveyor (15) is a spiral conveyor or a bucket elevator.
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| CN202111592118.4A CN114276036B (en) | 2021-12-23 | 2021-12-23 | Low-temperature calcining equipment for recycling industrial waste heat steam |
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| CN202111592118.4A CN114276036B (en) | 2021-12-23 | 2021-12-23 | Low-temperature calcining equipment for recycling industrial waste heat steam |
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| CN114276036B true CN114276036B (en) | 2023-01-24 |
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| CN1727296A (en) * | 2005-07-26 | 2006-02-01 | 万炳进 | Method and system for desulfurization in wet-process of limestone-gypsum, and resource process of desulfurized gypsum |
| CN103159418B (en) * | 2013-04-15 | 2014-07-23 | 平邑龙源石膏科技有限公司 | Beta-semi-hydrated gypsum powder calcination preparation technique and calcination apparatus |
| CN203728726U (en) * | 2013-12-18 | 2014-07-23 | 北京博奇电力科技有限公司 | Gypsum drying device using waste heat of power plant |
| CN207567121U (en) * | 2017-11-14 | 2018-07-03 | 北京中科领向环保研究院有限公司 | A kind of system that desulfurated plaster recycling is carried out using power plant exhaust waste heat |
| CN108709408A (en) * | 2018-06-29 | 2018-10-26 | 自贡市德明电站锅炉有限公司 | Aqueous gypsum drying and calcining device and technique |
| CN211770962U (en) * | 2020-03-10 | 2020-10-27 | 山东大学 | System for preparing sulphoaluminate cement by using all solid wastes of aluminum ash pretreatment |
| 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 |
| CN214218591U (en) * | 2021-01-21 | 2021-09-17 | 中山嘉珂环保科技有限公司 | Energy-concerving and environment-protective system of calcining of gypsum |
| CN112897914A (en) * | 2021-03-17 | 2021-06-04 | 河南鼎隆新材料科技有限公司 | Energy-saving treatment system for preparing gypsum cementing material from industrial byproduct gypsum |
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