Mixed calcining system for calcining by using waste heat of high-temperature ceramsite

Abstract

The utility model discloses a mixed calcining system for calcining by using waste heat of high-temperature ceramsite, and relates to the technical field of harmless treatment of solid waste, the mixed calcining system comprises a plurality of rotary kilns arranged in parallel, spiral first propelling blades are arranged in the rotary kilns, one ends of the rotary kilns are closed, the other ends of the rotary kilns are provided with material ports, the material ports are communicated with first material channels, and the first material channels are communicated with second material channels; a material valve is arranged on the first material channel, the end, away from the material opening, of the first material channel communicates with a feeding pipe, and a first propelling assembly is arranged in the feeding pipe; a second material channel is arranged below the first material channel and also communicates with the material opening, and the end, away from the material opening, of the second material channel is connected with a sorting assembly. The device has the effects of reducing ash leakage in the calcining process and improving the calcining work continuity.

Description

TECHNICAL FIELD

[0001] The application relates to the harmless treatment technology field of solid waste, in particular to a mixed calcining system utilizing high-temperature ceramsite waste heat calcination. BACKGROUND

[0002] The ceramsite is generally light, porous and high-temperature resistant, is widely used in building construction and soil improvement scenes, and is used as a filtering material, a filling material, a thermal insulation material and a basic raw material of various composite building materials. At present, high-temperature ceramsite and phosphogypsum are mixed and calcined in a rotary kiln, the attached water and the crystal water in the phosphogypsum are removed by utilizing the waste heat of the high-temperature ceramsite, and the phosphogypsum is converted into a usable building material gypsum powder material, which is an effective means for the harmless treatment of the phosphogypsum.

[0003] At present, the feeding port and the discharging port of the common rotary kiln are arranged at two ends of the rotary kiln and are communicated with a material channel to transport the mixed raw materials, and the ash-like phosphogypsum is easy to leak out from the gap of the communication part, and the leaked phosphogypsum is scattered in the air and is inhaled by workers, which affects the health of the workers. Meanwhile, the high-temperature ceramsite and the phosphogypsum need to be separately fed in a single rotary kiln, and the working efficiency is low. CONTENT OF THE INVENTION

[0004] The application aims to provide a mixed calcining system utilizing high-temperature ceramsite waste heat calcination, which reduces the leakage of the phosphogypsum, improves the feeding efficiency of the rotary kiln and ensures the continuity of the work.

[0005] A mixed calcining system utilizing high-temperature ceramsite waste heat calcination, comprising a plurality of parallel rotary kilns, a spiral first pushing blade is arranged in each rotary kiln, one end of each rotary kiln is closed, and a feeding port is arranged at the other end, a first material channel is communicated with the feeding port, a material valve is arranged on the first material channel, a feeding pipe is communicated with one end of the first material channel away from the feeding port, and a first pushing assembly is arranged in the feeding pipe;

[0006] A second material channel is arranged below the first material channel, the second material channel is also communicated with the feeding port, and a sorting assembly is connected to one end of the second material channel away from the feeding port.

[0007] By adopting the above technical scheme, one side of the rotary kiln is closed, the first material channel and the second material channel are both communicated with the feeding port, the number of the communication parts between the rotary kiln and the outside is reduced, and the possibility of the leakage of the ash-like phosphogypsum from the gap of the communication part is reduced. Meanwhile, the forward rotation of the rotary kiln moves the mixed raw materials to the closed part, and the reverse rotation discharges the materials, which increases the calcining time and improves the waste heat utilization rate of the high-temperature ceramsite.

[0008] By arranging a plurality of said rotary kilns in parallel and each being communicated with said feeding pipe, and by using the material valve arranged on said first material channel, the high-temperature ceramic and phosphogypsum mixed raw materials can be sequentially fed into said rotary kiln for calcination, thereby ensuring the continuity of the mixed calcination process and improving the work efficiency.

[0009] Optionally, said first pushing assembly comprises a pair of rotating shafts arranged in said feeding pipe, a conveying belt is arranged around said rotating shafts, a plurality of pushing plates are connected to said conveying belt, a first motor is arranged outside said feeding pipe, and said first motor is used to drive one of said rotating shafts to rotate.

[0010] By using the above technical solution, said first motor drives said rotating shafts to rotate, and said pushing plates then push the mixed raw materials to said first material channel communicated with said feeding pipe, so that the mixed raw materials enter said rotary kiln through said first material channel.

[0011] Optionally, a baffle is arranged at the material channel opening of said first material channel close to said material port, and said baffle is connected to said first material channel through a torsional spring.

[0012] By using the above technical solution, when the mixed raw materials enter said rotary kiln through said first material channel, the mixed raw materials impact said baffle to rotate, thereby blocking said second material channel and guiding the mixed raw materials to enter said rotary kiln, so as to avoid the mixed raw materials entering said second material channel.

[0013] Optionally, a discharging pipe is further connected between said second material channel and said sorting assembly, one end of said first material channel away from said material port is communicated with said discharging pipe, one end of said discharging pipe is provided with a third material channel, said third material channel is connected to said sorting assembly, and a second pushing assembly is arranged in said discharging pipe.

[0014] By using the above technical solution, the mixed raw materials calcinated by a plurality of said rotary kilns enter said discharging pipe, and said second pushing assembly is used to move the mixed raw materials to said third material channel, and the mixed raw materials are sorted by the sorting assembly connected to said third material channel, thereby realizing that one sorting assembly completes the discharging and sorting work of a plurality of said rotary kilns, and the calcination cost is saved compared to the prior art in which one said sorting assembly is matched with one said rotary kiln.

[0015] Optionally, said second pushing assembly comprises a rotating shaft, a second pushing blade is arranged on said rotating shaft, a second motor is arranged outside said discharging pipe, and said second motor is used to drive said rotating shaft to rotate.

[0016] By using the above technical solution, said second motor drives said rotating shaft to rotate, said rotating shaft drives said second pushing blade to rotate, and said second pushing blade then pushes the mixed raw materials to move.

[0017] Optionally, the discharge pipe is further provided with an air supply pipeline connected with an air supply fan.

[0018] By adopting the above technical scheme, the air supply pipeline delivers cooling air flow to cool the high-temperature ceramsite and calcined phosphogypsum, facilitating subsequent screening and packaging.

[0019] Optionally, the sorting assembly comprises a sorting screen, one side of the sorting screen is connected with a fourth material channel, and a sorting hopper is further arranged below the sorting screen.

[0020] By adopting the above technical scheme, the sorting assembly sorts the mixed raw materials after calcination, the ceramsite with large particle size is screened out and discharged through the fourth material channel, and the calcined phosphogypsum with small particle size is discharged through the sorting hopper.

[0021] Optionally, the sorting screen is connected with a vibrator.

[0022] By adopting the above technical scheme, the vibrator vibrating the sorting screen helps to improve the screening efficiency.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. By closing one side of the rotary kiln and connecting the first material channel and the second material channel with the material port, the number of communication parts between the rotary kiln and the outside is reduced, and the possibility of leakage of ash-like phosphogypsum from the communication gap is reduced. At the same time, the rotation of the rotary kiln moves the mixed raw materials to the closed part, and the subsequent discharge process increases the calcination time of the mixed raw materials, thereby improving the utilization rate of the waste heat of the high-temperature ceramsite.

[0025] 2. By arranging a plurality of rotary kilns in parallel and connecting them with the discharge pipe, and by arranging the material feeder on the first material channel, the mixed raw materials of high-temperature ceramsite and phosphogypsum can be sequentially fed into the rotary kiln for calcination, ensuring the continuity of the calcination process and improving the work efficiency.

[0026] 3. By feeding the raw materials after mixed calcination in the plurality of rotary kilns into the discharge pipe, and by using the second pushing assembly to move the mixed raw materials to the third material channel, the mixed raw materials are sorted by the sorting assembly connected with the third material channel, thereby realizing the work of one sorting assembly to complete the sorting of the discharge of multiple rotary kilns, which saves the calcination cost compared with the prior art of one rotary kiln matched with one sorting assembly. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a front view of the first embodiment of the present application;

[0028] Figure 2 is a top view of the feeding pipe of the present application;

[0029] Figure 3 is a sectional view of the rotary kiln of the utility model;

[0030] Figure 4 is a sectional view of the feeding pipe of the utility model;

[0031] Figure 5 is a front view of the third embodiment of the utility model;

[0032] Figure 6 is a top view of the discharging pipe of the utility model;

[0033] Figure 7 is a sectional view of the discharging pipe of the utility model.

[0034] In the figure, 1, rotary kiln; 101, first propeller blade; 102, material port; 2, feeding pipe; 201, conveying belt; 202, push plate; 203, first motor; 3, discharging pipe; 301, rotating shaft; 302, second propeller blade; 303, second motor; 4, first material channel; 5, second material channel; 6, third material channel; 7, sorting assembly; 701, sorting screen; 702, sorting hopper; 703, fourth material channel; 8, feeding hopper; 9, air blower; 901, air outlet; 10, baffle; 11, dust cover; 12, cyclone dust collector; 13, induced draft fan. DETAILED DESCRIPTION

[0035] The following will be described in detail in combination with the accompanying drawings. Figure 1 - the accompanying drawings Figure 7 , the present application is further described in detail.

[0036] Example 1

[0037] As shown in Figure 1 and Figure 2 , a kind of mixed calcining system of calcining using high-temperature ceramic particle waste heat, including several parallelly arranged rotary kiln 1.It is shown in Figure 3 , rotary kiln 1 is provided with helical first propeller blade 101, one end of rotary kiln 1 is closed, and the other end is provided with material port 102, material port 102 is communicated with first material channel 4, and material valve is arranged on first material channel 4, and the end of first material channel 4 away from material port 102 is communicated with feeding pipe 2, and first propelling assembly is arranged in feeding pipe 2.

[0038] As shown in Figure 1 and Figure 3 , the lower portion of first material channel 4 is provided with second material channel 5, and second material channel 5 is also communicated with material port 102, and the end of second material channel 5 away from material port 102 is connected with sorting assembly 7.

[0039] The feeding pipe 2 is provided with a feeding hopper 8, and the high-temperature ceramsite and the phosphogypsum enter the feeding pipe 2 through the feeding hopper 8. The first pushing blade 101 is used to move the mixed raw materials to the closed end when the rotary kiln 1 rotates, and the first pushing blade 101 is used to move the mixed raw materials to the material port when the rotary kiln 1 reverses.

[0040] Specifically, one side of the rotary kiln 1 is closed, and the first material channel 4 and the second material channel 5 are both communicated with the material port 102, thereby reducing the number of communication positions of the rotary kiln 1 and the material channel, and reducing the possibility of the ash-like phosphogypsum leaking from the gap of the communication position. Meanwhile, the process of moving the mixed raw materials to the closed end when the rotary kiln 1 rotates and then discharging the materials when the rotary kiln 1 reverses increases the calcination time of the mixed raw materials, and improves the waste heat utilization rate of the high-temperature ceramsite.

[0041] Since the feeding port and the discharging port of the common rotary kiln 1 are arranged at two ends, the phosphogypsum is easy to float out from the gap of the communication position of the feeding port and the discharging port and the material channel, and is inhaled by workers, thereby affecting the health of the workers. In the utility model, one end of the rotary kiln 1 is closed, and only the material port 102 is arranged on one side, thereby reducing the length of the gap and reducing the possibility of the phosphogypsum leaking. Meanwhile, in the common rotary kiln, the mixed raw materials are discharged from the discharging port at the other end after being fed from the feeding port at one end, and the calcination time of the mixed raw materials is effective. In the utility model, the first material channel 4 and the second material channel 5 are arranged at the same end, and the calcination time of the mixed raw materials is prolonged by using the process of reversing the rotary kiln 1 to discharge the materials, thereby improving the waste heat utilization rate of the high-temperature ceramsite.

[0042] As shown in Figure 1 and Figure 3 , a negative pressure hot air circulation assembly is connected to the rotary kiln 1, and the negative pressure hot air circulation assembly comprises an induced draft fan 13 and a cyclone dust collector 12. The air inlet end of the cyclone dust collector 12 is communicated with one end of the rotary kiln 1 away from the material port 102, the air outlet end of the cyclone dust collector 12 is communicated with the air inlet end of the induced draft fan 13, and the air outlet end of the induced draft fan 13 is communicated with one end of the rotary kiln 1 close to the material port 102. Dust is generated when the high-temperature ceramsite and the phosphogypsum are calcined in the rotary kiln 1, and the dust may carry impurities to affect the calcination effect. By using the induced draft fan 13 and the cyclone dust collector 12, large-particle impurities are separated by the cyclone dust collector 12 and then discharged, and small-particle reactants that have not completely reacted are introduced into the rotary kiln 1 for further calcination, thereby improving the utilization rate. Meanwhile, the negative pressure hot air circulation assembly forms a wind path circulation, and the heat of the hot air is further used in the calcination process, thereby reducing the heat loss.

[0043] Further, a plurality of rotary kilns 1 are arranged side by side and are all communicated with the feeding pipe 2, and a material valve is arranged on the first material channel 4, so that the mixed raw materials of the high-temperature ceramsite and the phosphogypsum can be sequentially introduced into the rotary kiln 1 for calcination, thereby ensuring the continuity of the mixed calcination process and improving the work efficiency.

[0044] Preferably, the material valve is an electromagnetic valve, and the material valve is electrically connected with an external controller, and the automatic opening and closing of the material valve can be controlled by setting a fixed time, only one material valve is kept open at each time, and the mixed raw materials can only enter the rotary kiln 1 with the open material valve, after the feeding of one of the rotary kilns 1 is completed, the material valve corresponding to the rotary kiln 1 is closed, and the other material valve is opened, and under the action of the first advancing assembly, the mixed raw materials enter the corresponding rotary kiln 1, so that the rotary kilns 1 work in turn, and the continuity of the calcination work is ensured.

[0045] As shown in Figure 1 , the first material channel 4 is provided with a baffle 10 at the material channel opening close to the material port 102, the baffle 10 is connected with the first material channel 4 through a torsional spring, when the mixed raw materials enter the rotary kiln 1 through the first material channel 4, the mixed raw materials impact the baffle 10 to rotate, so that the baffle 10 blocks the second material channel 5, and the mixed raw materials are guided to enter the rotary kiln 1, and the mixed raw materials are prevented from entering the second material channel 5. When the mixed raw materials end up entering the rotary kiln 1, the baffle 10 is automatically rotated under the action of the torsional spring, and the second material channel 5 is opened, so as to facilitate the discharge of the rotary kiln 1 when it is reversed.

[0046] As shown in Figure 1 , the sorting assembly 7 includes a sorting screen 701, and the material channel opening of the second material channel 5 extends into the range of the sorting screen, and a sorting hopper 702 is further arranged below the sorting screen 701, the mixed raw materials discharged from the second material channel 5 are sorted by the sorting assembly 7 to separate the ceramsite and the calcined phosphogypsum, the ceramsite with a larger particle size is screened out and discharged through the fourth material channel 703, and the calcined phosphogypsum with a smaller particle size is screened and discharged through the sorting hopper 702.

[0047] In the embodiment, the sorting screen 701 has a certain inclination angle, and the fourth material channel 703 is located at the side with a lower height of the sorting screen 701, so as to facilitate the ceramsite after screening to enter the fourth material channel 703. In addition, a dust cover 11 is further arranged on the sorting screen 701, so as to prevent the dust generated during screening from floating in the air and affecting the working environment.

[0048] The sorting screen 701 is connected with a vibrator, and the vibration of the vibrator is helpful for screening the ceramsite and the calcined phosphogypsum, and the screening efficiency is improved.

[0049] The implementation principle of the embodiment of the application is as follows:

[0050] The mixed raw materials of the high-temperature ceramsite and the phosphogypsum are continuously fed into the feeding pipe 2 through the feeding hopper 8, under the action of the first advancing assembly, the mixed raw materials enter the rotary kiln 1 in turn when the material valves are opened and closed in turn, the rotary kiln 1 is reversed after being rotated for a period of time, so that the mixed raw materials are discharged from the second material channel 5, the second material channel 5 is connected with the sorting assembly 7 to realize the screening of the mixed raw materials, and the mixing and calcination are completed.

[0051] Embodiment two

[0052] The difference between the embodiment and the embodiment one is that the structure of the first advancing assembly is further limited.

[0053] As shown in Figure 4 , the first advancing assembly comprises a pair of rotating shafts arranged in the feeding pipe 2, a conveying belt 201 is arranged around the two rotating shafts, a first motor 203 is arranged outside the feeding pipe 2, the output end of the first motor 203 is connected with one of the rotating shafts, the rotating shafts are driven to rotate by the first motor 203, and then the conveying belt 201 is driven to rotate. A plurality of pushing plates 202 are connected on the conveying belt 201, the mixed raw materials can be pushed to move by the pushing plates 202, so that the mixed raw materials can reach any one of the first material channels 4, and when the material valve is opened, the mixed raw materials can enter the corresponding rotary kiln 1.

[0054] Embodiment three

[0055] The difference between the embodiment and the embodiment one and the embodiment two is that the discharge pipe 3 is additionally arranged on the basis of the embodiment one or the embodiment two.

[0056] As shown in Figure 5 and Figure 6 , the second material channel 5 is further connected with the sorting assembly 7 through the discharge pipe 3, the end of the first material channel 4 away from the material port 102 is communicated with the discharge pipe 3, one end of the discharge pipe 3 is provided with the third material channel 6, the third material channel 6 is connected with the sorting assembly 7; the second advancing assembly is arranged in the discharge pipe 3.

[0057] In the embodiment, the material channel port of the third material channel 6 extends into the range of the sorting screen 701 of the sorting assembly 7.

[0058] Specifically, the mixed raw materials after calcination of the plurality of rotary kilns 1 all enter the discharge pipe 3, and the second advancing assembly is used to move the mixed raw materials to the third material channel 6, the mixed raw materials are sorted by the sorting assembly 7 connected with the third material channel 6, so that one sorting assembly 7 can complete the work of discharging and sorting of the plurality of rotary kilns 1, and compared with the prior art that one sorting assembly 7 is matched with one rotary kiln 1, the calcination cost is saved.

[0059] As shown in Figure 7 , the second advancing assembly comprises a rotating shaft 301, a second advancing blade 302 is arranged on the rotating shaft 301, preferably, the second advancing blade 302 is an auger. A second motor 303 is arranged outside the discharge pipe 3, the output end of the second motor 303 is connected with the rotating shaft 301, the second motor 303 drives the rotating shaft 301 to rotate, so that the second advancing blade 302 rotates, and then the second advancing blade 302 pushes the mixed raw materials to move.

[0060] As shown in Figure 7As shown, the discharge pipe 3 is further provided with a blast pipe connected with a blower 9, and the blast pipe is used to deliver cooling air flow to cool the high-temperature ceramsite and calcined phosphogypsum, so as to facilitate subsequent screening and packaging.

[0061] The embodiments of the present embodiment are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, wherein the same parts are denoted by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A hybrid calcination system for calcination using high temperature ceramsite waste heat, characterized by, The application relates to a rotary kiln (1) which comprises a plurality of rotary kilns arranged in parallel, a spiral first pushing blade (101) arranged in the rotary kiln (1), one end of the rotary kiln (1) being closed, a material port (102) arranged at the other end of the rotary kiln (1), a first material channel (4) communicated with the material port (102), a material valve arranged on the first material channel (4), a feeding pipe (2) communicated with one end of the first material channel (4) away from the material port (102), and a first pushing assembly arranged in the feeding pipe (2). A second material channel (5) is arranged below the first material channel (4) and communicated with the material port (102), and a sorting assembly (7) is connected to one end of the second material channel (5) away from the material port (102).

2. The mixed calcining system for calcining with high-temperature ceramsite waste heat according to claim 1, characterized in that, The first pushing assembly comprises a pair of rotating shafts arranged in the feeding pipe (2), a conveying belt (201) arranged around the rotating shafts, a plurality of pushing plates (202) connected to the conveying belt (201), and a first motor (203) arranged outside the feeding pipe (2) and used for driving one of the rotating shafts to rotate.

3. The mixed calcination system for calcination by utilizing the waste heat of high-temperature ceramsite according to claim 1, characterized in that, A baffle (10) is arranged at a material channel opening of the first material channel (4) close to the material port (102), and the baffle (10) is connected to the first material channel (4) through a torsional spring.

4. The hybrid calciner system for calcination using high temperature ceramsite waste heat according to claim 1, characterized in that, A discharging pipe (3) is further connected between the second material channel (5) and the sorting assembly (7), one end of the first material channel (4) away from the material port (102) is communicated with the discharging pipe (3), a third material channel (6) is arranged at one end of the discharging pipe (3) and connected to the sorting assembly (7), and a second pushing assembly is arranged in the discharging pipe (3).

5. The hybrid calciner system for calcination using high temperature ceramsite waste heat according to claim 4, characterized in that, The second pushing assembly comprises a rotating shaft (301) and a second pushing blade (302) arranged on the rotating shaft (301), and a second motor (303) is arranged outside the discharging pipe (3) and used for driving the rotating shaft (301) to rotate.

6. The hybrid calciner system for calcination using high temperature ceramsite waste heat according to claim 4, characterized in that, An air feeding pipeline is further arranged on the discharging pipe (3) and connected to an air feeder (9).

7. The hybrid calciner system for calcination using high temperature ceramsite waste heat according to claim 1, characterized in that, The sorting assembly (7) comprises a sorting screen (701), one side of the sorting screen (701) is connected to a fourth material channel (703), and a sorting hopper (702) is further arranged below the sorting screen (701).

8. The hybrid calciner system for calcination using high temperature ceramsite waste heat according to claim 7, characterized in that, A vibrator is connected to the sorting screen (701).

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