CN215162202U

CN215162202U - System for utilize oil shale semicoke preparation baked brick

Info

Publication number: CN215162202U
Application number: CN202120516315.7U
Authority: CN
Inventors: 杨冬伟; 郭键柄; 陈正; 丁志广; 张亚东
Original assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Current assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-12-14
Anticipated expiration: 2031-03-11

Abstract

The utility model provides a system for preparing baked bricks by utilizing oil shale semicoke, which comprises a heat transmission mechanism, a pretreatment mechanism, an external heating type rotary kiln, a batching and stirring mechanism and a forming and sintering mechanism which are connected in sequence, wherein the external heating type rotary kiln is provided with a hot air inlet and a gas outlet; the molding sintering mechanism comprises a brick kiln, and the brick kiln is provided with a hot air outlet and a gas inlet; the heat transmission mechanism comprises an induced draft fan and a gas conduit, the hot air inlet is communicated with the hot air outlet through the induced draft fan, and the gas outlet is communicated with the gas inlet through the gas conduit. The utility model discloses an organic gas that produces the semicoke carbomorphism process of oil shale introduces the burning of brick kiln to the hot flue gas that will burn in the brick kiln sintering process simultaneously introduces and provides the heat in the external heating formula rotary kiln, can realize the heat cycle recycle of entire system in-process.

Description

System for utilize oil shale semicoke preparation baked brick

Technical Field

The utility model relates to a recovery field of recycling of oil shale semicoke, more specifically say, relate to a system for utilize oil shale semicoke preparation baked brick.

Background

The oil shale semicoke is solid waste generated in the process of producing shale oil by using a low-temperature dry distillation technology, and the oil shale contains a large amount of mineral substances, so that the amount of the oil shale semicoke generated by dry distillation is large and almost accounts for 60-80% of the treatment amount of the oil shale. In the development and utilization process, if the oil shale semicoke is not utilized, the oil shale semicoke is bound to become a development obstacle of the industry. If the oil shale semicoke is recycled, not only can the economic benefit of enterprises be increased, but also the environmental pollution can be reduced, and the economic benefit and the environmental benefit are both sufficient.

At present, the reports on the preparation of commercial concrete, the production of ceramsite and the like by using the oil shale semicoke are related, but the reports on the production of the baked brick are less. In addition, the oil shale semicoke contains organic components and fixed carbon, has a certain calorific value, and is rarely utilized at present.

SUMMERY OF THE UTILITY MODEL

To overcome the deficiencies in the prior art, one of the objects of the present invention is to solve one or more of the problems of the prior art. For example, one of the objects of the present invention is to provide a system for preparing baked bricks by using oil shale semicoke.

The utility model provides a system for preparing baked bricks by using oil shale semicoke, which can comprise a heat transmission mechanism, a pretreatment mechanism, an external heating type rotary kiln, a batching and stirring mechanism and a forming and sintering mechanism which are connected in sequence, wherein the external heating type rotary kiln is provided with a hot air inlet and a gas outlet; the molding sintering mechanism comprises a brick kiln, and the brick kiln is provided with a hot air outlet and a gas inlet; the heat transmission mechanism comprises an induced draft fan and a gas conduit, the hot air inlet is communicated with the hot air outlet through the induced draft fan, and the gas outlet is communicated with the gas inlet through the gas conduit.

Compared with the prior art, the beneficial effects of the utility model at least contain at least one of following:

(1) the utility model introduces the organic gas generated by carbonizing the oil shale semicoke in the external heating type rotary kiln into the brick kiln for combustion, and simultaneously introduces the hot flue gas generated in the sintering process of the brick kiln into the external heating type rotary kiln to become the heat source of the external heating type rotary kiln, thereby realizing the heat recycling in the whole system process;

(2) because the oil shale semicoke has a certain calorific value after being carbonized in the external heating type rotary kiln, the system of the utility model can directly sinter the oil shale semicoke with a certain calorific value for brick making, and can reduce the fuel consumption in the brick making process;

(3) the main components of the carbonized oil shale semicoke are silicon dioxide and calcium oxide, and the waste of the silicon dioxide and the calcium oxide can be reduced by using the carbonized oil shale semicoke as a raw material for brick firing, so that the resource recycling of the oil shale semicoke can be realized.

Drawings

The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

fig. 1 shows a schematic view of the system for sintering bricks by using oil shale semicoke according to the present invention.

Description of reference numerals:

1-external heating type rotary kiln, 2-brick kiln, 3-induced draft fan, 4-gas guide pipe, 5-crusher, 6-sieving machine, 7-ball mill, 8-elevator, 9-buffer bin, 10-proportioning bin, 11-quantitative feeder, 12-belt conveyor, 13-stirrer, 14-forming machine, 15-air blower, 101-hot air inlet, 102-gas outlet, 201-hot air outlet, 202-gas inlet, 1001-kiln cylinder, 1002-combustion chamber, 1003-kiln head cover, 1004-kiln tail cover.

Detailed Description

Hereinafter, a system for manufacturing a sintered brick using oil shale semicoke according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

The utility model provides an utilize system of oil shale semicoke preparation baked brick the utility model discloses an in an exemplary embodiment of system of utilizing oil shale semicoke preparation baked brick, as shown in figure 1, the system can include pretreatment mechanism, outer hot type rotary kiln 1, batching rabbling mechanism, shaping sintering mechanism and heat transmission mechanism. The pretreatment mechanism, the external heating rotary kiln 1, the batching and stirring mechanism and the molding and sintering mechanism are communicated with each other in sequence. The pretreatment mechanism can be used for the pretreatment of carbonization of the oil shale semi-coke. The batching and stirring mechanism can be used for batching and stirring the oil shale semicoke after carbonization treatment and the raw materials necessary for preparing the baked bricks. The molding and sintering mechanism can be used for molding and sintering the materials processed by the material mixing mechanism. The heat transfer mechanism may be used to condition and reuse the heat of the system.

The external heating rotary kiln 1 has a hot air inlet 101 and a gas outlet 102. The molding and sintering mechanism comprises a brick kiln 2. The kiln 2 has a hot air outlet 201 and a gas inlet 202. The heat transmission mechanism comprises an induced draft fan 3 and a gas conduit 4, and the hot air inlet 101 is communicated with the hot air outlet 201 through the induced draft fan 3. The gas outlet 102 communicates with the gas inlet 202 through the gas conduit 4.

Further, the pretreatment mechanism may include a crusher 5, a sifter 6, a ball mill 7, and an elevator 8. The crusher 5, the sieving machine 6 and the ball mill 7 are communicated with each other in sequence. The crusher 5 crushes the oil shale semi-coke and then conveys the crushed oil shale semi-coke to the sieving machine 6 for sieving, the sieving machine 6 conveys undersize materials to the ball mill 7 for ball milling after sieving, and the materials ball-milled by the ball mill 7 are conveyed to the external heating type rotary kiln 1. The elevator 8 has a lower opening that receives oversize material sieved by the sieving machine 6 and an upper opening that lifts the oversize material to the upper opening and conveys it to the crusher 5. The oversize can be reused by the hoisting machine 8.

Further, the ingredient mixing mechanism may include an ingredient bin 10, a constant feeder 11, a belt conveyor 12, and a mixer 13. The proportioning bin 10 receives the material discharged from the external heating rotary kiln 1, and the material is conveyed to the constant feeder 11 after being proportioned, and the constant feeder 11 is conveyed to the stirring machine 13 through the belt conveyor 12 after being weighed, and is conveyed to the molding sintering mechanism after being stirred by the stirring machine 13. The constant feeder 11 is disposed between the proportioning bin 10 and the mixer 13. The quantitative feeder 11 is provided with an inlet and an outlet. The inlet of the quantitative feeder 11 receives the ingredients discharged from the outlet of the proportioning bin 10, and the ingredients are weighed and discharged from the outlet of the quantitative feeder 11 into the mixer 13. The ingredients after being discharged from the outlet of the quantitative feeder 11 may be conveyed to the mixer 13 through a belt conveyor 12 provided at the outlet of the quantitative feeder 11.

Further, the molding and sintering mechanism may also include a molding machine 14. The forming machine 14 receives the material mixed by the mixer 13, and conveys the formed material to the brick kiln 2.

Specifically, as shown in fig. 1, the system may include: a crusher 5, a sieving machine 6, a ball mill 7, an external heating type rotary kiln 1, a proportioning bin 10, a stirrer 13, a forming machine 14, a brick kiln 2, a draught fan 3 and a gas guide pipe 4, wherein,

the crusher 5 is provided with an oil shale semicoke inlet and a crushed material outlet. After the oil shale semicoke enters from the oil shale semicoke inlet, the crusher 5 crushes the oil shale semicoke. The crusher 5 may be a impact crusher. Of course, the crusher may be another type of crusher, and is not illustrated here. And (4) feeding the crushed oil shale semicoke into a sieving machine 6. The screening machine 6 is provided with a crushing material inlet and a screen underflow feed opening. The sieving machine 6 sieves the material crushed by the crusher 5. For example, material having a radial dimension greater than 15mm is oversize and material having a radial dimension less than 15mm is undersize. Undersize enters from an undersize inlet of the ball mill 7, is subjected to ball milling in the ball mill 7, and is discharged from a ball mill material outlet of the ball mill 7. The undersize products can be changed into powder after ball milling, which is beneficial to fully carbonizing the undersize products. After the ball milling is finished, the ball milled materials enter the external heating type rotary kiln 1 from a ball milling material outlet. The external heating type rotary kiln 1 is provided with a rotary kiln inlet, a rotary kiln outlet, a hot air inlet and a gas outlet. The materials after ball milling enter from the inlet of the rotary kiln and are carbonized to decompose the organic matters thermally. The hot air inlet and the gas outlet are both communicated with the brick kiln 2. The hot air inlet is used for receiving hot flue gas generated by the brick kiln 2. The gas outlet is used for discharging volatile gases (e.g., organic combustible gases containing hydrocarbons) generated during the carbonization of the oil shale semicoke into the brickkiln 2. The proportioning bin 10 is used for receiving the oil shale semi-coke carbonized in the external heating type rotary kiln 1, and raw materials indispensable for preparing the baked bricks are added into the proportioning bin 10. The raw materials and the added amount of the raw materials for preparing the baked bricks are the conventional technology in the field. The carbonized oil shale semicoke is mixed with other raw material components in the mixing bin 10, enters the mixer 13 from a mixing inlet of the mixer 13 and is mixed strongly, and the mixed material is discharged from a mixing outlet of the mixer 13 and enters the forming machine 14. The molding machine 14 performs the stirred material into a predetermined shape, and then discharges the material from the outlet of the molding machine 14 to enter the brick kiln 2 for sintering. The brick kiln 2 is provided with a formed brick inlet, a sintered brick outlet, a hot air outlet and a gas inlet. The shaped brick inlet communicates with the outlet of the forming machine 14. And the sintered brick outlet is used for discharging sintered bricks after sintering. The hot air outlet of the brick kiln 2 is communicated with the hot air inlet of the external heating rotary kiln 1 through a draught fan 3. The hot flue gas generated in the brick kiln 2 can be directly introduced into the external heating type rotary kiln through the draught fan 3 to heat the external heating type rotary kiln, and the heat generated in the brick kiln 2 in the brick firing process can be effectively utilized. The gas conduit 4 can communicate the gas outlet of the external heating type rotary kiln 1 with the gas inlet of the brick kiln 2, and can introduce volatile gas generated in the carbonization process of the oil shale semicoke in the external heating type rotary kiln 1 into the brick kiln 2 for combustion so as to provide heat for the brick kiln 2, recycle of the volatile gas in the carbonization process can be realized, and fuel consumption in the brick burning process is reduced.

In the above, volatile gas generated by carbonizing the oil shale semicoke in the external heating type rotary kiln 1 is introduced into the brick kiln for combustion, and then flue gas generated in the brick kiln 2 is introduced into the external heating type rotary kiln 1 for heating the rotary kiln, so that the heat can be recycled. In addition, the carbonized oil shale semicoke has a certain heat value, and the fuel consumption in the brick making process can be further reduced.

Further, the system may also comprise a buffer bin 9. The buffer bin 9 is arranged between the ball mill 7 and the external heating type rotary kiln 1. An inlet of the buffer bin 9 is communicated with a ball milling material outlet of the ball mill 7, and an outlet of the buffer bin 9 is communicated with a rotary kiln inlet of the external heating rotary kiln 1.

Further, the external heating rotary kiln 1 is composed of a kiln cylinder 1001 and a combustion chamber 1002 located at the periphery of the kiln cylinder 1001, and a kiln head cover 1003 and a kiln tail cover 1004 are respectively arranged at two ends of the kiln cylinder 1001. The combustion chamber 1002 is used to heat the kiln barrel 1001. The combustion chamber 1002 may further be provided with a flue gas outlet for discharging flue gas in the combustion chamber.

Further, the hot air inlet 101 may be opened on the combustion chamber 1002. The kiln barrel 1001 can be heated by introducing hot flue gases from the brick kiln into the combustion chamber 1002. The gas outlet 102 may be disposed on the kiln hood 1004.

Further, the system may also include a blower 15. The blower 15 is used to blow air into the kiln.

Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A system for preparing baked bricks by using oil shale semicoke is characterized by comprising a heat transmission mechanism, a pretreatment mechanism, an external heating type rotary kiln (1), a batching and stirring mechanism and a forming and sintering mechanism which are sequentially communicated, wherein,

the external heating rotary kiln (1) is provided with a hot air inlet (101) and a gas outlet (102);

the molding and sintering mechanism comprises a brick kiln (2), and the brick kiln (2) is provided with a hot air outlet (201) and a gas inlet (202);

the heat transmission mechanism comprises an induced draft fan (3) and a gas guide pipe (4), a hot air inlet (101) is communicated with a hot air outlet (201) through the induced draft fan (3), and a gas outlet (102) is communicated with a gas inlet (202) through the gas guide pipe (4).

2. The system for preparing the baked bricks by using the oil shale semicoke as claimed in claim 1, wherein the pretreatment mechanism comprises a crusher (5), a sieving machine (6), a ball mill (7) and an elevator (8), wherein the crusher (5) crushes the oil shale semicoke and then conveys the crushed oil shale semicoke to the sieving machine (6) for sieving, the sieving machine (6) conveys undersize materials to the ball mill (7) for ball milling, and the materials after ball milling by the ball mill (7) are conveyed to the external heating type rotary kiln (1);

the lifter (8) is provided with a lower opening and an upper opening, the lower opening receives oversize products screened by the screening machine (6), and the oversize products are lifted to the upper opening and then conveyed to the crusher (5).

3. The system for preparing the baked bricks by using the oil shale semi-coke as claimed in claim 2, further comprising a buffer bin (9), wherein the feeding end of the buffer bin (9) is communicated with the ball mill (7), and the discharging end of the buffer bin (9) is communicated with the external heating type rotary kiln (1).

4. The system for preparing the baked bricks by using the oil shale semicoke as claimed in claim 1, 2 or 3, wherein the batching and stirring mechanism comprises a batching bin (10), a quantitative feeder (11), a belt conveyor (12) and a stirring machine (13), wherein the batching bin (10) receives the materials discharged by the external heating type rotary kiln (1), the materials are subjected to batching treatment and then conveyed to the quantitative feeder (11), the quantitative feeder (11) is weighed and then conveyed to the stirring machine (13) through the belt conveyor (12), and the materials are conveyed to the molding and sintering mechanism after being stirred by the stirring machine (13).

5. The system for preparing the baked bricks by using the oil shale semi-coke as claimed in claim 4, wherein the forming and sintering mechanism further comprises a forming machine (14), and the forming machine (14) receives the material stirred by the stirrer (13), and conveys the formed material to the brick kiln (2).

6. The system for preparing the baked bricks by using the oil shale semi-coke as claimed in claim 1, 2, 3 or 5, wherein the external heating type rotary kiln (1) comprises a kiln cylinder (1001) and a combustion chamber (1002) positioned at the periphery of the kiln cylinder (1001), and a kiln head cover (1003) and a kiln tail cover (1004) are respectively arranged at two ends of the kiln cylinder (1001).

7. The system for preparing the baked bricks by using the oil shale semi-coke as claimed in claim 6, wherein the hot air inlet (101) is opened on the combustion chamber (1002) and the gas outlet (102) is opened on the kiln tail hood (1004).

8. The system for producing baked bricks by using oil shale semi-coke according to claim 1, 2, 3, 5 or 7, characterized by further comprising a blower (15), wherein the blower (15) is communicated with the brick kiln (2).