A strontium carbonate calcining apparatus

Abstract

The utility model discloses a kind of strontium carbonate calcining devices, it is related to fine chemical industry field.The device includes sequentially connected raw material manufacturing components, belt dryer, screening conveying components, rotary kiln and reaction tank.It is innovative, set a set of heat recovery system connecting rotary kiln end and belt dryer.The system is made of heat recovery pipe and air mixing device, heat recovery pipe adopts flexible connection and has ash removal function, can export the high-temperature waste gas of rotary kiln safely;Air mixing device is through cyclone dust collection, circumferential jet flow air mixing and emergency sprinkling etc. The utility model effectively solves the pipeline deformation in waste heat recovery, dust blockage and temperature control problem, realizes the efficient cyclic utilization of energy, with the advantages of energy saving and consumption reduction, stable operation, product quality improvement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the fine chemical industry field, concretely relates to a strontium carbonate calcining device. BACKGROUND

[0002] In the process of preparing strontium oxide or strontium hydroxide from strontium carbonate, a plurality of processes such as mixing, granulation, drying, calcination and subsequent reaction are usually required. These processes involve the collaborative operation of a series of equipment such as a mixer, a granulator, a belt dryer, a rotary kiln and a reaction tank. The rotary kiln, as the core calcination equipment, generates a large amount of high-temperature waste gas during its operation. These waste gases are usually directly discharged, causing huge energy waste. At the same time, the front-end belt dryer needs to consume additional fuel to provide heat source, which not only increases the production cost, but also does not meet the green and environmental protection production requirements. At present, although some technologies attempt to utilize waste heat, there are often technical difficulties such as pipe connection deformation due to thermal stress, equipment wear and blockage due to high dust content in waste gas, and unstable hot air temperature affecting drying quality. Therefore, there is an urgent need for a system solution that can efficiently, stably and safely recover and utilize the waste heat of the rotary kiln and integrate it into the entire calcination production line. SUMMARY

[0003] The utility model aims at providing a strontium carbonate calcining device to solve the problems in the prior art. To achieve the above-mentioned purpose, the utility model employs the technical scheme of:

[0004] A strontium carbonate calcining device, comprising raw material manufacturing components, a belt dryer, a screening and conveying component, a rotary kiln and a reaction tank connected in sequence;

[0005] The rotary kiln is connected with a heat recovery component at the end, and the output end of the heat recovery component is communicated with the belt dryer;

[0006] The heat recovery component comprises a heat recovery pipe and an air mixing device;

[0007] The rotary kiln is connected with the heat recovery pipe at the end, the heat recovery pipe is communicated with the air mixing device, and the output end of the air mixing device is connected with the belt dryer.

[0008] Further, the air mixing device comprises an outer shell, an air mixing component and an emergency spraying component;

[0009] The outer shell comprises a column segment, an inverted cone segment and a settling segment connected in sequence from top to bottom;

[0010] The column segment has a plurality of air mixing components arranged in a circular array on the outer wall at the bottom, and the inverted cone segment has a plurality of emergency spraying components arranged in a circular array on the outer wall;

[0011] The air mixing component is used to control the temperature of the air at the output end, and the emergency spraying component sprays to reduce the temperature when the temperature is too high.

[0012] Further, the air mixing component includes a jet pipe, a regulating valve, and a cold air source.

[0013] The jet pipe is connected to the inside of the column segment, the input end of the jet pipe is connected to the cold air source, and the jet pipe is provided with the regulating valve.

[0014] The regulating valve is electrically connected to the control unit.

[0015] Further, the emergency spraying component includes a spraying pipe and a double-fluid atomizing spray gun, the spraying pipe is connected to the inside of the inverted cone segment, and the input end of the spraying pipe is connected to the double-fluid atomizing spray gun.

[0016] The double-fluid atomizing spray gun is electrically connected to the control unit.

[0017] Further, the top of the column segment is connected to the air inlet pipe in the tangential direction, the inverted cone segment is connected to the air outlet pipe, and the air outlet pipe is provided with a thermocouple.

[0018] The thermocouple is electrically connected to the control unit.

[0019] Further, it also includes a connecting structure, which includes a corrugated pipe and two symmetrically arranged connecting flanges at its ends.

[0020] The regenerative pipe includes a conical cover, a pipe body, a hinged ash removal door, and a compressed air purge ring.

[0021] The two connecting flanges are respectively detachably connected to the rotary kiln end and the conical cover, the conical cover is fixedly connected to the pipe body, and the pipe body has a plurality of hinged ash removal doors arranged linearly at the bottom.

[0022] A plurality of compressed air purge rings are linearly arranged along the length direction of the pipe body, and the pipe body is connected to the air inlet pipe.

[0023] Further, the belt dryer includes an air inlet main pipe, an air inlet auxiliary pipe, a first air distribution plate, a second air distribution plate, and a box body.

[0024] The top of the box body is connected to a plurality of air inlet auxiliary pipes, a plurality of air inlet auxiliary pipes are connected to the air inlet main pipe, and the air inlet main pipe is connected to the air mixing device.

[0025] The top of the box body is sequentially provided with the first air distribution plate and the second air distribution plate from top to bottom.

[0026] The bottom of the box body is provided with an air outlet, and the air outlet is connected to an air induction component.

[0027] Further, the raw material manufacturing component includes a mixer and a granulator;

[0028] The screening conveying component includes a screening machine and a weighing belt;

[0029] The mixer, the granulator, the belt dryer, the screening machine, the weighing belt, the rotary kiln and the reaction tank are sequentially connected.

[0030] The utility model has the following beneficial effects: the utility model discloses that the high-temperature waste gas generated by rotary kiln is directly used as the heat source of the front-end belt dryer through the special waste heat recovery system, realizes the cascade and recycling of energy in the production system, has the remarkable energy-saving and cost-reducing effect, and greatly reduces the fuel cost of the drying link. The system effectively compensates the thermal expansion displacement between the rotary kiln and the fixed pipeline through the flexible connecting structure, prevents the deformation or leakage of the connecting portion due to stress concentration, and improves the long-term operation reliability of the equipment. The innovative combined air mixing and cooling device integrates cyclone dust collection, accurate air mixing and emergency spraying functions, can not only effectively remove large particle dust in the waste gas and protect the subsequent fan and drying equipment, but also can accurately stabilize the waste gas temperature within the process requirement range through automatic regulation and control, and ensures the uniformity and stability of the drying quality. In addition, the belt dryer adopts a unique double-layer air distribution plate structure, so that hot air can uniformly penetrate the material layer, effectively avoids the phenomenon of local overheating or uneven drying, and further improves the quality of the final product. The whole system is designed ingeniously, compact in structure and high in automation, and provides an excellent waste heat comprehensive utilization example for similar ore processing production lines. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the utility model;

[0032] Figure 2 It is a sectional view of the air mixing device;

[0033] Figure 3 It is a sectional view of the connecting structure and the regenerative pipe;

[0034] Figure 4 It is a sectional view of the belt dryer. DETAILED DESCRIPTION

[0035] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. If not specially pointed out, the technical means used in the embodiments are conventional means familiar to those skilled in the art.

[0036] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0037] As shown in Figures 1-4 A strontium carbonate calcining device, comprising raw material manufacturing components, a belt dryer 4, screening and conveying components, a rotary kiln 11, a reaction tank 12 connected in sequence;

[0038] The raw material manufacturing components comprise a mixer 5 and a granulator 7;

[0039] The screening and conveying components comprise a screening machine 9 and a weighing belt 15;

[0040] The mixer 5, the granulator 7, the belt dryer 4, the screening machine 9, the weighing belt 15, the rotary kiln 11 and the reaction tank 12 are connected in sequence;

[0041] The raw material (strontium carbonate in this example) in the mixer 5 is mixed with additives and then sent into the granulator 7 by a screw conveyor 6 to be pressed into a spherical shape, the pressed raw material is then sent into the belt dryer 4 by a small-inclination belt conveyor 13 to perform drying operation, the dried raw material is sent into the screening machine 9 by a bucket elevator 14 to separate the broken strontium carbonate, and the intact one is weighed by the weighing belt 15 and sent into the rotary kiln 11 by a large-inclination belt conveyor 10 to be calcined and cracked into strontium oxide, and the strontium oxide is sent into the reaction tank 12 from the output end of the rotary kiln 11 to react with water to generate strontium hydroxide;

[0042] The rotary kiln 11 is connected with a heat recovery component, and the output end of the heat recovery component is communicated with the belt dryer 4;

[0043] Further comprising a connecting structure 1, the connecting structure 1 comprises a corrugated pipe 102 and connecting flanges 101 symmetrically arranged at both ends of the corrugated pipe 102; through the flexible connection of the corrugated pipe 102, relative movement between the heat recovery pipe 2 and the rotary kiln 11 is allowed, and deformation is avoided;

[0044] The heat recovery pipe 2 comprises a conical cover 201, a pipe body 202, a hinge type dust removal door 203 and a compressed air purging ring 204; a conical guide plate (inclination 30°) is arranged in the conical cover 201 to avoid the accumulation of dust caused by smoke vortex; a wear-resistant lining plate (material NM400) is welded at the edge of the guide plate to prolong the service life;

[0045] Pipe body 202 is composed of an inner layer of heat-resistant stainless steel (such as 310S) and an outer layer of insulation cotton / rock wool, and the whole is cylindrical;

[0046] The two connecting flanges 101 are detachably connected to the end of the rotary kiln 11 and the conical cover 201, respectively. The conical cover 201 is fixedly connected to the pipe body 202. The bottom of the pipe body 202 has a plurality of hinged dust removal doors 203 arranged linearly. The hinged dust removal doors 203 can be opened and closed and can be used to remove ash at regular intervals. The pipe body 202 has a plurality of compressed air purging rings 204 arranged linearly along its length. The end of the pipe body 202 is connected to the air inlet pipe 301. During dust removal, the compressed air purging rings 204 blow compressed gas to blow the ash out of the hinged dust removal doors 203, which is especially effective for bent parts.

[0047] The heat recovery component includes a heat recovery pipe 2 and an air mixing device 3;

[0048] The rotary kiln 11 is connected to the heat recovery pipe 2 at its end, the heat recovery pipe 2 is connected to the air mixing device 3, and the output end of the air mixing device 3 is connected to the belt dryer 4.

[0049] The exhaust gas at the end of the rotary kiln 11 is sent from the heat recovery pipe 2 through the air inlet pipe 301 into the air mixing device 3, and after being mixed, it is sent into the belt dryer 4 to dry the raw materials.

[0050] like Figure 1 As shown, the air mixing device 3 includes an outer shell, an air mixing component 303, and an emergency spray component 305; the outer shell includes a column section 302, an inverted cone section 304, and a settling section 307 connected sequentially from top to bottom;

[0051] The intake pipe 301 is shaped like a tapered nozzle, and this area inside the cylindrical section 302 forms a spacious cyclone chamber. High-temperature exhaust gas enters the cylindrical section 302 tangentially at a high speed, generating a strong centrifugal force along the cylinder wall. Heavier dust particles are thrown against the cylinder wall, lose kinetic energy after impact, and slide down the wall to the bottom settling section 307. The bottom of the settling section 307 has an openable opening for ash discharge. This achieves primary gravity dust removal, protecting the subsequent fan and dryer. Below the cyclone section, the outer perimeter of the cylinder is a surrounding annular cavity (both belong to the cylindrical section 302).

[0052] The bottom outer wall of the column segment 302 is circumferentially arrayed with several air mixing components 303. Each air mixing component 303 includes a jet pipe, a regulating valve, and a cold air source. The jet pipe connects to the interior of the column segment 302, and the input end of the jet pipe is connected to the cold air source. The regulating valve is installed on the jet pipe. The regulating valve is electrically connected to the control unit, and these valves are driven by the PID temperature controller of the control unit. Thermocouple 3061 monitors the temperature of the mixed air in real time. If the temperature is higher than the set value, the controller proportionally opens the cold air regulating valve to draw in more cold air for mixing and cooling; otherwise, it closes the valve. Through circumferential multi-point jetting, the cold air can be instantly and uniformly mixed with the high-temperature exhaust gas, avoiding the temperature unevenness and air path fluctuations caused by traditional single-point air mixing.

[0053] Inverted cone section 304: ① Breaks tangential flow: transforms the rotating airflow into a direct axial flow; ② Flow equalization: makes the airflow velocity more uniform across the cross section; ③ Anti-clogging: the cone angle makes it difficult for dust to accumulate.

[0054] The outer wall of the inverted cone section 304 is circumferentially arrayed with a plurality of emergency spray components 305; each emergency spray component 305 includes a spray pipe and a dual-fluid atomizing spray gun, the spray pipe is connected to the interior of the inverted cone section 304, and the input end of the spray pipe is connected to the dual-fluid atomizing spray gun; the dual-fluid atomizing spray gun is electrically connected to a control unit; the air mixing component 303 is used to control the output air temperature, and the emergency spray components 305 rapidly spray to cool down when the temperature is too high;

[0055] When the outlet temperature sensor detects an abnormally high temperature (e.g., >400℃, possibly due to a drastic change in kiln conditions), and the cold air regulating valve is fully open but still cannot control the temperature, the system automatically starts spraying, injecting extremely fine water mist to instantly force cooling using the principle of vaporization heat absorption, thus protecting the downstream equipment; this is the system's last safety barrier.

[0056] Specifically, the top of the column section 302 is connected to an air inlet pipe 301 along the tangential direction, the inverted cone section 304 is connected to an air outlet pipe 306, and a thermocouple 3061 is provided on the air outlet pipe 306; the thermocouple 3061 is electrically connected to a control unit and is used to monitor and feedback the gas temperature of the air outlet pipe 306.

[0057] like Figure 4As shown, the belt dryer 4 includes a main air inlet pipe 401, secondary air inlet pipes 402, a first air distribution plate 403, a second air distribution plate 404, and a housing 405. The top of the housing 405 is connected to several secondary air inlet pipes 402, which in turn connect to the main air inlet pipe 401. The main air inlet pipe 401 connects to the mixing device 3. From top to bottom, the top of the housing 405 is provided with appropriately sized first air distribution plates 403 and second air distribution plates 404. The upper first air distribution plate 403 is a coarse air distribution plate (15mm aperture, 30mm hole spacing), and the lower second air distribution plate 404 is a fine air distribution plate (8mm aperture, 20mm hole spacing). The distance between the two layers is 100mm, achieving uniform diffusion of flue gas and preventing localized overheating or uneven drying of the material. Multiple secondary air inlet pipes 402 enter from different positions, making the ventilation positions more dispersed.

[0058] In addition, the bottom of the housing 405 is provided with an exhaust port that connects to the exhaust port of the belt dryer 4 to the air duct component 8. The air duct component 8 includes an exhaust fan and a bag filter. The exhaust fan provides a power source, and the bag filter collects the dust generated during drying. Both are existing technologies and will not be described in detail.

[0059] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A strontium carbonate calcination apparatus, characterized in that: It includes raw material manufacturing components, belt dryer (4), screening and conveying components, rotary kiln (11), and reaction vessel (12) connected in sequence; The rotary kiln (11) is connected to a regenerating component at its end, and the output end of the regenerating component is connected to the belt dryer (4). The heat recovery component includes a heat recovery pipe (2) and a mixing device (3); The rotary kiln (11) is connected to the heat recovery pipe (2) at its end. The heat recovery pipe (2) is connected to the air mixing device (3). The output end of the air mixing device (3) is connected to the belt dryer (4).

2. The strontium carbonate calcination apparatus according to claim 1, characterized in that: The air mixing device (3) includes an outer shell, an air mixing component (303), and an emergency spray component (305); The outer shell includes a column section (302), an inverted cone section (304), and a settling section (307) connected sequentially from top to bottom; The bottom outer wall of the column section (302) has a plurality of air mixing components (303) arranged in a circular array, and the outer wall of the inverted cone section (304) has a plurality of emergency spray components (305) arranged in a circular array. The air mixing component (303) is used to control the temperature of the output air body, and the emergency spray component (305) sprays water quickly to cool down when the temperature is too high.

3. The strontium carbonate calcination apparatus according to claim 2, characterized in that: The air mixing component (303) includes a jet pipe, a regulating valve, and a cold air source; The jet pipe is connected to the interior of the column section (302), the input end of the jet pipe is connected to the cold air source, and the jet pipe is equipped with the regulating valve; The regulating valve is electrically connected to the control unit.

4. The strontium carbonate calcination apparatus according to claim 2, characterized in that: The emergency spray component (305) includes a spray pipe and a dual-fluid atomizing spray gun. The spray pipe is connected to the interior of the inverted cone section (304), and the input end of the spray pipe is connected to the dual-fluid atomizing spray gun. The dual-fluid atomizing spray gun is electrically connected to the control unit.

5. The strontium carbonate calcination apparatus according to claim 2, characterized in that: The top of the column section (302) is connected to an air inlet pipe (301) along the tangential direction, and the inverted cone section (304) is connected to an air outlet pipe (306). A thermocouple (3061) is provided on the air outlet pipe (306). The thermocouple (3061) is electrically connected to the control unit.

6. The strontium carbonate calcination apparatus according to claim 5, characterized in that: It also includes a connection structure (1), which includes a bellows (102) and a connection flange (101) symmetrically arranged at both ends; The regenerating pipe (2) includes a conical shroud (201), a pipe body (202), a hinged dust removal door (203), and a compressed air purging ring (204); The two connecting flanges (101) are detachably connected to the end of the rotary kiln (11) and the conical cover (201), respectively. The conical cover (201) is fixedly connected to the pipe body (202). The bottom of the pipe body (202) has a plurality of hinged dust removal doors (203) arranged in a linear array. The tube body (202) has a plurality of compressed air purge rings (204) arranged linearly along its length, and the end of the tube body (202) is connected to the air inlet pipe (301).

7. The strontium carbonate calcination apparatus according to claim 1, characterized in that: The belt dryer (4) includes a main air inlet pipe (401), a secondary air inlet pipe (402), a first air distribution plate (403), a second air distribution plate (404), and a housing (405); The top of the housing (405) is connected to a plurality of the intake sub-pipes (402), the plurality of the intake sub-pipes (402) are connected to the intake main pipe (401), and the intake main pipe (401) is connected to the air mixing device (3). The top of the housing (405) is provided with a first air distribution plate (403) and a second air distribution plate (404) of the same size from top to bottom; The bottom of the housing (405) is provided with an exhaust port, which is connected to the air intake component (8).

8. The strontium carbonate calcination apparatus according to claim 5, characterized in that: The raw material manufacturing components include a mixer (5) and a granulator (7); The screening and conveying components include a screening machine (9) and a weighing belt (15); The mixer (5), the granulator (7), the belt dryer (4), the sieve (9), the weighing belt (15), the rotary kiln (11), and the reaction vessel (12) are connected in sequence.

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