A petroleum coke calcination heat recycling system

Abstract

The present invention belongs to the technical field of calcination production of petroleum coke, and particularly relates to a heat recycling system for calcining petroleum coke, which comprises a drying device, a first kiln body, a second kiln body, a cooling kiln and a discharge bin connected in sequence; the drying device is in cyclic communication with a waste heat refrigeration device, the air outlets of the first kiln body, the second kiln body and the cooling kiln are connected to the waste heat refrigeration device through a first waste heat refrigeration pipeline, and the discharge bin is in communication with the waste heat refrigeration device; on the one hand, the high-temperature flue gas generated by the first kiln body and the second kiln body and the air outlet of the cooling kiln are directly heat-exchanged with the petroleum coke in the drying device after being cooled in the first stage to remove the moisture of the petroleum coke; on the other hand, the third gas obtained after the second-stage cooling can cool the discharged materials of the cooling kiln that do not meet the cooling requirements to meet the needs of material cooling.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum coke calcination production, and in particular relates to a petroleum coke calcination heat circulation utilization system. Background Art

[0002] Usually, petroleum coke is first calcined to obtain high-temperature calcined coke, and then enters the cooling kiln for cooling treatment. To ensure the cooling effect, the cooling kiln needs to have excellent performance, which requires strict control of the operating parameters of the cooling kiln, such as the adjustment of the rotation speed, the control of the spray intensity, etc. However, it is inevitable that the processing speed of the cooling kiln cannot keep up with the feeding speed of the calcining kiln, resulting in the situation that the temperature of the material has not dropped below the expected temperature when it comes out of the cooling kiln.

[0003] In addition, the temperature of high-temperature calcined coke is around 900-1000℃, and this part of the material contains huge amounts of heat. The high-temperature calcined coke enters the cooling kiln and is cooled by a combined cooling method of directly spraying cooling water on the high-temperature coke in the kiln and indirectly spraying cooling water on the kiln lining. Water vaporization takes away the heat to achieve cooling. At the same time, a large amount of dust-containing, water vapor-containing and other gases are generated during the cooling process. The final outlet air temperature is 130-180℃, which is directly discharged into the environment, which not only wastes a lot of energy, but also creates an environmental burden. Summary of the invention

[0004] In order to make up for the deficiencies mentioned in the background technology, the present invention provides a petroleum coke calcination heat recycling system.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a petroleum coke calcination heat recycling system, comprising a drying device, a first kiln body, a second kiln body, a cooling kiln and a discharge bin which are connected in sequence;

[0007] The drying device is cyclically connected with the waste heat refrigeration device;

[0008] The gas outlets of the first kiln body, the second kiln body and the cooling kiln are connected to the waste heat refrigeration device via a first waste heat refrigeration pipeline;

[0009] The discharge bin is connected to the waste heat refrigeration device via a third pipeline;

[0010] The petroleum coke is dried by the drying device to remove moisture, then enters the first kiln body, is heated to 500-800℃, and enters the second kiln body for calcination. The high-temperature flue gas generated by the first kiln body and the second kiln body and the exhaust gas of the cooling kiln enter the exhaust heat refrigeration device through the first exhaust heat refrigeration pipeline. After the first stage of cooling, the first gas is obtained. The first gas enters the drying device through the first pipeline, exchanges heat with the petroleum coke, and after removing moisture from the petroleum coke, it becomes the second gas and enters the exhaust heat refrigeration device through the second pipeline. After the second gas in the exhaust heat refrigeration device is cooled in the second stage, the third gas is obtained. The third gas enters the discharge bin through the third pipeline. After cooling the exhaust gas that does not meet the cooling requirement of the cooling kiln, the fourth gas is obtained. The fourth gas is discharged through the fourth pipeline.

[0011] It also includes a dust removal device, the first kiln body, the second kiln body, and the cooling kiln are connected to the dust removal device, and the high-temperature flue gas generated by the first kiln body and the second kiln body and the exhaust gas of the cooling kiln are dust-removed and then enter the waste heat refrigeration device through the first waste heat refrigeration pipeline.

[0012] It also includes a precooling device, the first kiln body and the second kiln body are connected to the precooling device, and the high-temperature flue gas generated by the first kiln body and the second kiln body is precooled and then enters the dust removal device through the precooling air outlet pipeline.

[0013] The precooling device is connected to the waste heat refrigeration device via a precooling air inlet pipeline, and the first gas, the second gas and the third gas can initially cool down the high-temperature flue gas generated by the first kiln body and the second kiln body.

[0014] The waste heat refrigeration device is provided with a blower for performing first stage cooling and second stage cooling.

[0015] The cooling kiln is a drum-type cooler, which is provided with a direct cooling pipe inside for directly spraying cooling water on the pre-cooled material, and an indirect cooling pipe outside for cooling the drum wall.

[0016] The dust removal device is a pulse long bag dust collector.

[0017] Beneficial Effects

[0018] The petroleum coke calcination heat recycling system of the present invention, on the one hand, utilizes the high-temperature flue gas generated by the first kiln body and the second kiln body and the outlet gas of the cooling kiln after the first stage of cooling, and directly exchanges heat with the petroleum coke in the drying device to remove the moisture of the petroleum coke; on the other hand, after the second stage of cooling, the second gas obtained can cool the outlet of the cooling kiln that does not meet the cooling requirement, so as to meet the material cooling requirement. In this way, the waste heat in the petroleum coke calcination process is fully utilized, and the cooling function of the cooling kiln alone cannot meet the outlet requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A schematic diagram of a petroleum coke calcination heat recycling system provided in an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1. Drying device, 2. First kiln body, 3. Second kiln body, 4. Cooling kiln, 5. Discharging bin, 6. Waste heat refrigeration device, 601. First waste heat refrigeration pipeline, 602. First pipeline, 603. Second pipeline, 604. Third pipeline, 605. Fourth pipeline, 7. Dust removal device, 8. Precooling device, 801. Precooling outlet pipeline, 802. Precooling inlet pipeline. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Example 1

[0024] A petroleum coke calcination heat recycling system comprises a drying device 1, a first kiln body 2, a second kiln body 3, a cooling kiln 4 and a discharge bin 5 which are connected in sequence;

[0025] The drying device 1 is cyclically connected with the waste heat refrigeration device 6;

[0026] The gas outlets of the first kiln body 2, the second kiln body 3 and the cooling kiln 4 are connected to the waste heat refrigeration device 6 via the first waste heat refrigeration pipeline 601;

[0027] The discharge bin 5 is connected to the waste heat refrigeration device 6 via a third pipeline 604;

[0028] The petroleum coke is dried by the drying device 1 to remove moisture, and then enters the first kiln body 2, is heated to 500-800°C, and enters the second kiln body 3 for calcination. The high-temperature flue gas generated by the first kiln body 2 and the second kiln body 3 and the outlet gas of the cooling kiln 4 enter the waste heat refrigeration device 6 through the first waste heat refrigeration pipeline 601. After the first stage of cooling, the first gas is obtained. The first gas enters the drying device 1 through the first pipeline 602, exchanges heat with the petroleum coke, and after removing the moisture of the petroleum coke, it becomes the second gas and enters the waste heat refrigeration device 6 through the second pipeline 603. After the second gas in the waste heat refrigeration device 6 is cooled in the second stage, the third gas is obtained. The third gas enters the discharge bin 5 through the third pipeline 604. After cooling the outlet gas of the cooling kiln 4 that does not meet the cooling requirement, the fourth gas is obtained. The fourth gas is discharged through the fourth pipeline 605.

[0029] In this embodiment, a secondary dust removal device (not shown in the figure) is preferably connected to the fourth pipeline 605.

[0030] Among them, in the drying device 1, only the high-temperature flue gas after the first stage of cooling is used to evaporate the moisture of the petroleum coke, and no volatile matter of the petroleum coke is generated; in the first kiln body 2, the petroleum coke is heated to 500-800°C, generating a large amount of volatile matter and high-temperature flue gas, and the high-temperature flue gas is recovered as waste heat; in the second kiln body 3, the petroleum coke is heated to above 1250°C for calcination, and high-temperature flue gas is generated at the same time, which is also recovered as waste heat; in the cooling kiln 4, water vaporization takes away heat to achieve cooling, so the water vapor also contains heat, which is also recovered.

[0031] The petroleum coke calcination heat recycling system of the present invention, on the one hand, utilizes the high-temperature flue gas generated by the first kiln body 2 and the second kiln body 3 and the outlet gas of the cooling kiln 4 after the first stage of cooling, and directly exchanges heat with the petroleum coke in the drying device 1 to remove the moisture of the petroleum coke; on the other hand, after the second stage of cooling, the third gas obtained can cool the outlet of the cooling kiln 4 that does not meet the cooling requirement, so as to meet the material cooling requirement. In this way, the waste heat in the petroleum coke calcination process is fully utilized, and the cooling function of the cooling kiln 4 alone is avoided from failing to meet the outlet requirements.

[0032] Taking into account that the high-temperature flue gas generated has not only high temperature and high dust content but also complex flue gas composition, preferably, the petroleum coke calcination heat recycling system also includes a dust removal device 7, and the first kiln body 2, the second kiln body 3, and the cooling kiln 4 are connected to the dust removal device 7. The high-temperature flue gas generated by the first kiln body 2 and the second kiln body 3 and the exhaust gas of the cooling kiln 4 are dust-removed and then enter the waste heat refrigeration device 6 through the first waste heat refrigeration pipeline 601.

[0033] Furthermore, the dust removal device 7 is a pulse long bag dust collector to adapt to the temperature of the high-temperature flue gas.

[0034] The high-temperature flue gas after dust removal can prevent the dust from clogging the equipment and affecting the materials during subsequent utilization. For example, too much dust will affect the quality of calcined petroleum coke.

[0035] In addition, the temperature of the high-temperature flue gas can reach 550°C. If it directly enters the dust removal device 7, it will cause damage to the dust removal device 7. Furthermore, the petroleum coke calcination heat recycling system also includes a precooling device 8. The first kiln body 2 and the second kiln body 3 are connected to the precooling device 8. The high-temperature flue gas generated by the first kiln body 2 and the second kiln body 3 is precooled and then enters the dust removal device 7 through the precooling outlet pipeline 801.

[0036] In order to further reduce the generation of waste heat, the initial cooling method of the high-temperature flue gas in the precooling device 8 can make full use of the gas cooled in the waste heat refrigeration device. Preferably, the precooling device 8 is connected to the waste heat refrigeration device 6 via the precooling air inlet pipeline 802, and the first gas, the second gas, and the third gas, which are much lower in temperature than the high-temperature flue gas, are mixed with the high-temperature flue gas to exchange heat, thereby initially cooling the high-temperature flue gas generated by the first kiln body 2 and the second kiln body 3.

[0037] In addition, in the cooling method of the waste heat refrigeration device 6, the present invention adopts an air cooling method. Preferably, the waste heat refrigeration device 6 is provided with a blower for performing the first stage cooling and the second stage cooling. The gas with waste heat is cooled by controlling the operating parameters of the blower, such as the speed, the operating time, etc. For the sake of environmental protection, it is preferred to blow in air at normal temperature.

[0038] The cooling method in the cooling kiln 4 is water cooling. Specifically, the cooling kiln 4 is a drum cooler, which is provided with a direct cooling pipe for directly spraying cooling water on the pre-cooled material, and an indirect cooling pipe for cooling the drum wall. As an option but not a limitation, the cooling kiln 4 can also be provided with a cold coke material dispensing port to provide auxiliary cooling for the calcined finished coke during the mixing of the formula materials.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A petroleum coke calcination heat recycling system, characterized in that: It comprises a drying device (1), a first kiln body (2), a second kiln body (3), a cooling kiln (4) and a discharge bin (5) which are connected in sequence; The drying device (1) is cyclically connected to the waste heat refrigeration device (6); The gas outlets of the first kiln body (2), the second kiln body (3) and the cooling kiln (4) are connected to the waste heat refrigeration device (6) via a first waste heat refrigeration pipeline (601); The discharge bin (5) is connected to the waste heat refrigeration device (6) via a third pipeline (604); The cooling kiln (4) is provided with a cooling coke material supply inlet; The petroleum coke is dried in a drying device (1) to remove moisture, and then enters a first kiln body (2), is heated to 500-800°C, and enters a second kiln body (3) for calcination. The high-temperature flue gas generated by the first kiln body (2) and the second kiln body (3) and the exhaust gas of the cooling kiln (4) enter the exhaust heat refrigeration device (6) through a first exhaust heat refrigeration pipeline (601). After cooling in the first stage, a first gas is obtained. The first gas enters the drying device (1) through a first pipeline (602), exchanges heat with the petroleum coke, removes moisture from the petroleum coke, becomes a second gas, and enters the exhaust heat refrigeration device (6) through a second pipeline (603). After cooling in the second stage, the second gas in the exhaust heat refrigeration device (6) obtains a third gas. The third gas enters a discharge bin (5) through a third pipeline (604). After cooling the exhaust gas of the cooling kiln (4) that does not meet the cooling requirement, a fourth gas is obtained. The fourth gas is discharged through a fourth pipeline (605).

2. The petroleum coke calcination heat recycling system according to claim 1, characterized in that: The invention also comprises a dust removal device (7), wherein the first kiln body (2), the second kiln body (3) and the cooling kiln (4) are connected to the dust removal device (7), and the high-temperature flue gas generated by the first kiln body (2) and the second kiln body (3) and the exhaust gas of the cooling kiln (4) are dust-removed and then enter the waste heat refrigeration device (6) through the first waste heat refrigeration pipeline (601).

3. The petroleum coke calcination heat recycling system according to claim 2, characterized in that: The invention also comprises a precooling device (8), wherein the first kiln body (2) and the second kiln body (3) are connected to the precooling device (8), and the high-temperature flue gas generated by the first kiln body (2) and the second kiln body (3) is precooled and then enters the dust removal device (7) through the precooling air outlet pipeline (801).

4. The petroleum coke calcination heat recycling system according to claim 3, characterized in that: The precooling device (8) is connected to the waste heat refrigeration device (6) via the precooling air inlet pipeline (802), and the first gas, the second gas, and the third gas can initially cool the high-temperature flue gas generated by the first kiln body (2) and the second kiln body (3).

5. The petroleum coke calcination heat recycling system according to claim 1, characterized in that: The waste heat refrigeration device (6) is provided with a blower for performing first stage cooling and second stage cooling.

6. The petroleum coke calcination heat recycling system according to claim 1, characterized in that: The cooling kiln (4) is a drum-type cooler, which is provided with a direct cooling pipe inside for directly spraying cooling water on the pre-cooled material, and an indirect cooling pipe outside for cooling the drum wall.

7. The petroleum coke calcination heat recycling system according to claim 2, characterized in that: The dust removal device (7) is a pulse long bag dust collector.

Images