A petroleum coke rotary calcining process and device

Abstract

The present invention belongs to the technical field of coke production and preparation, and specifically relates to a petroleum coke rotary calcining process and device. When producing a petroleum coke product compounded from a plurality of different categories of calcined petroleum cokes, a first calcined petroleum coke raw material is rotary calcined, and when unloading into a cooling kiln, a second calcined petroleum coke of another category that has been calcined is added in parallel flow, and heat exchange occurs between the first calcined petroleum coke and the second calcined petroleum coke during mixing, and the temperature of the first calcined petroleum coke is accelerated to be reduced by the low-temperature second calcined petroleum coke, and the rotation speed of the cooling kiln is increased due to the temperature reduction, thereby promoting the mixing, turning and stirring effect of the petroleum coke, which also makes it possible for the mixed raw materials to be stirred and mixed in another mixer after coming out of the cooling kiln, or to obtain a mixed calcined petroleum coke product or a semi-finished product after only a short period of simple stirring and mixing, and the above process can also save cooling water.

Description

Technical Field

[0001] The invention belongs to the technical field of coke production and preparation, and specifically relates to a petroleum coke rotary calcining process and device. Background Art

[0002] Petroleum coke products are often obtained by mixing several different types of calcined petroleum cokes in proportion. For example, a certain petroleum coke product M is a mixture of Class A calcined petroleum coke and Class B calcined petroleum coke in proportion. When organizing the production, Class A calcined petroleum coke and Class B calcined petroleum coke are first rotary calcined in a rotary kiln, and then stirred and mixed through a mixing process.

[0003] When using a rotary kiln to calcine petroleum coke, the petroleum coke usually falls into a cooling kiln for cooling after being calcined in the rotary kiln. At this time, since the temperature of the high-temperature calcined petroleum coke is still very high, the cooling kiln needs to spray water with high intensity to cool the high-temperature petroleum coke. In addition, in order to allow the petroleum coke to have sufficient cooling time, the speed of the cooling kiln cannot be too high, otherwise the petroleum coke will not be fully cooled and will leave the cooling kiln body prematurely. This production method has higher requirements for equipment types and generates higher energy consumption. Summary of the invention

[0004] In order to make up for the deficiencies mentioned in the background technology to a certain extent, the present invention provides a petroleum coke rotary calcining process and device.

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

[0006] The present invention provides a petroleum coke rotary calcination process, comprising the following steps:

[0007] S1: transporting the raw material of the first calcined petroleum coke to the feed port at the tail of the rotary kiln, obtaining the first calcined petroleum coke after rotary calcination in the rotary kiln, and discharging the first calcined petroleum coke to the feed port of the cooling kiln through the discharge port at the head of the kiln;

[0008] S2: at the inlet of the cooling kiln, the second calcined petroleum coke having a lower temperature than the first calcined petroleum coke is fed into the cooling kiln together with the first calcined petroleum coke from the rotary kiln according to a set ratio, and the first calcined petroleum coke and the second calcined petroleum coke are continuously mixed and heat exchanged in the cooling kiln by the rotation of the cooling kiln, so that the temperature of the first calcined petroleum coke is accelerated to decrease;

[0009] S3: The first calcined petroleum coke and the second calcined petroleum coke are rotated and cooled together in a cooling kiln, and then discharged from a discharge port of the cooling kiln to obtain mixed calcined petroleum coke;

[0010] Wherein: the second calcined petroleum coke is a single type of calcined petroleum coke or a mixture of multiple types of calcined petroleum cokes;

[0011] The set ratio described in step S2 is determined according to the ratio of the final petroleum coke product M, and the petroleum coke product M is compounded from a plurality of different calcined petroleum cokes including a first calcined petroleum coke and a second calcined petroleum coke.

[0012] Suppose the operating speed of the cooling kiln when it only receives the first calcined petroleum coke from the rotary kiln is V1, and suppose the operating speed of the cooling kiln when it simultaneously receives the second calcined petroleum coke and the first calcined petroleum coke from the rotary kiln is V2, then V2>V1.

[0013] Assume that the cooling water spray flow rate when the cooling kiln only receives the first calcined petroleum coke from the rotary kiln is Q1, and the cooling water spray flow rate when the cooling kiln receives the second calcined petroleum coke and the first calcined petroleum coke from the rotary kiln is Q2, then Q2 <Q1。

[0014] In step S2, the first calcined petroleum coke and the second calcined petroleum coke are fed into the cooling kiln at the inlet of the cooling kiln in parallel.

[0015] In step S2, the first calcined petroleum coke and the second calcined petroleum coke flow in parallel at the inlet of the cooling kiln and are fed into the cooling kiln after auxiliary mixing.

[0016] In step S2, the second calcined petroleum coke having a lower temperature than the first calcined petroleum coke is a calcined petroleum coke at 20-30°C.

[0017] The present invention also provides a petroleum coke rotary calcining device for realizing the petroleum coke rotary calcining process, comprising a first material storage section, a rotary kiln, a second material storage section and a cooling kiln, wherein the first material storage section is connected to a feed port at a rotary kiln tail portion via a first material feeding section to transport the first calcined petroleum coke raw material to the rotary kiln, the discharge port at a rotary kiln head portion is connected to a feed port of a cooling kiln via a second material feeding section, and the second material storage section is connected to a feed port of a cooling kiln via a third material feeding section to transport the second calcined petroleum coke to the cooling kiln.

[0018] It also includes a fourth material feeding part, wherein the second material feeding part and the third material feeding part are joined to the fourth material feeding part, and the fourth material feeding part is connected to the material inlet of the cooling kiln.

[0019] An auxiliary mixing component is arranged inside the fourth feeding part to perform auxiliary mixing on the first calcined petroleum coke and the second calcined petroleum coke after parallel flow.

[0020] The cooling kiln is provided with more than two water cooling devices.

[0021] Beneficial Effects

[0022] The present invention first performs rotary calcination on the raw material of the first calcined petroleum coke, and then mixes it with other types of room-temperature calcined petroleum coke to exchange heat, and then cools it down. This not only quickly reduces the temperature of the first calcined petroleum coke and reduces the amount of cooling water, but also increases the rotation speed of the cooling kiln due to the reduction in temperature, thereby promoting the mixing, turning and stirring of the petroleum coke. This also makes it possible for the mixed raw materials to be stirred and mixed in another mixer after coming out of the cooling kiln, or to obtain a mixed calcined petroleum coke product or semi-finished product after only a short period of simple stirring and mixing.

[0023] The present invention controls the feeding ratio of the second calcined petroleum coke in the second material storage part according to the set ratio of the first calcined petroleum coke and the second calcined petroleum coke, thereby obtaining calcined petroleum coke with accurate ratio and high quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the rotary calcining device used in the petroleum coke rotary calcining process of Example 1 of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the rotary calcining device used in the petroleum coke rotary calcining process of Example 2 of the present invention.

[0026] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0027] Description of reference numerals:

[0028] 1. First material storage section, 11. First material feeding section, 2. Rotary kiln, 21. Second material feeding section, 3. Second material storage section, 31. Third material feeding section, 4. Cooling kiln, 41. Fourth material feeding section, 42. Auxiliary mixing component. DETAILED DESCRIPTION

[0029] 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.

[0030] Example 1

[0031] This embodiment provides a petroleum coke rotary calcination process. Figure 1 The petroleum coke rotary calcination process uses Figure 1 The rotary calcining device shown is implemented.

[0032] like Figure 1As shown, the rotary calcining device includes a first material storage part 1, a rotary kiln 2, and a cooling kiln 4. The first material storage part 1 is connected to the feed port at the tail of the rotary kiln 2 via a first material feeding part 11 to transport the first calcined petroleum coke raw material to the rotary kiln 2. The discharge port at the head of the rotary kiln 2 is connected to the feed port of the cooling kiln 4 via a second material feeding part 21.

[0033] Different from the prior art, the rotary calcining device is additionally provided with a second material storage part 3 , which is connected to the feeding port of the cooling kiln 4 via a third material feeding part 31 to feed the second calcined petroleum coke to the cooling kiln 4 .

[0034] Thus, the petroleum coke rotary calcining process of the present embodiment is implemented by the following steps:

[0035] S1: The raw material of the first calcined petroleum coke is transported to the feed port at the kiln tail of the rotary kiln 2, and the first calcined petroleum coke is obtained after rotary calcination in the rotary kiln 2. The first calcined petroleum coke is discharged to the feed port of the cooling kiln 4 through the discharge port at the kiln head.

[0036] Since calcined petroleum coke products are often obtained by mixing several different types of calcined petroleum cokes in proportion, in this embodiment, the first calcined petroleum coke raw material is first rotary calcined, and then mixed with other types of calcined calcined petroleum cokes to exchange heat and cool them down.

[0037] S2: At the inlet of the cooling kiln 4, the second calcined petroleum coke having a lower temperature than the first calcined petroleum coke is fed into the cooling kiln 4 together with the first calcined petroleum coke from the rotary kiln 2 according to a set ratio. With the help of the rotation of the cooling kiln 4, the first calcined petroleum coke and the second calcined petroleum coke are continuously mixed and heat exchanged in the cooling kiln 4, so that the temperature of the first calcined petroleum coke is accelerated to decrease.

[0038] In this step, the second calcined petroleum coke is transported to the cooling kiln 4 through the newly-installed second material storage section 3 and the third material transport section 31 .

[0039] In this embodiment, the feeding ratio of the second calcined petroleum coke is controlled according to the set ratio of the first calcined petroleum coke and the second calcined petroleum coke, so as to obtain calcined petroleum coke with accurate ratio and high quality. The set ratio is determined according to the ratio of the final petroleum coke product M, which is compounded by a plurality of different calcined petroleum cokes including the first calcined petroleum coke and the second calcined petroleum coke.

[0040] It should be noted that the second calcined petroleum coke is calcined petroleum coke, which is generally stored in a natural environment, so its temperature is much lower than that of the first calcined petroleum coke, and can be room temperature or near room temperature, such as calcined petroleum coke at 20-30°C. Moreover, since the petroleum coke product M may contain many types of petroleum coke, the second calcined petroleum coke referred to in this embodiment may be a single type of calcined petroleum coke or a mixture of multiple types of calcined petroleum cokes. For example, in order to better coordinate the throughput of the cooling kiln 4, two or more calcined calcined petroleum cokes belonging to the same petroleum coke product M are combined into the above-mentioned second calcined petroleum coke to be transported to the cooling kiln 4 through the second material storage section 3.

[0041] To ensure the cooling effect, preferably, in step S2, the first calcined petroleum coke and the second calcined petroleum coke are fed into the cooling kiln 4 at the inlet of the cooling kiln 4 in parallel. Figure 1 As shown, the rotary calcining device further includes a fourth material feeding part 41 , and the second material feeding part 21 and the third material feeding part 31 are joined to the fourth material feeding part 41 , and are connected to the material inlet of the cooling kiln 4 through the fourth material feeding part 41 .

[0042] S3: The first calcined petroleum coke and the second calcined petroleum coke are rotated and cooled together in the cooling kiln 4 and then discharged from the discharge port of the cooling kiln 4 to obtain mixed calcined petroleum coke.

[0043] On the basis of step S2, the petroleum coke after mixing and heat exchange not only reduces the temperature of the first calcined petroleum coke, but also increases the rotation speed of the cooling kiln 4 due to the temperature reduction. If the working speed of the cooling kiln 4 when only receiving the first calcined petroleum coke from the rotary kiln 2 is V1, and the working speed of the cooling kiln 4 when receiving the second calcined petroleum coke and the first calcined petroleum coke from the rotary kiln 2 is V2, the present invention promotes the mixing and stirring effect of the petroleum coke by making V2>V1. This makes it possible to obtain a mixed calcined petroleum coke product or semi-finished product without the need for another mixer to stir and mix the mixed raw materials after they come out of the cooling kiln 4, or only after a short period of simple stirring and mixing.

[0044] Note that "semi-finished product" is mentioned here because in the implementation of the above steps of the present application, although the second calcined petroleum coke is fed along the flow according to the set ratio of the petroleum coke product M, there may be a situation where, in one production, not all calcined petroleum coke required for the petroleum coke product M (including those that have not yet been calcined or have been calcined but not mixed in) is mixed along the flow. In this case, additional production and / or mixing procedures are required to obtain the petroleum coke product M in the sense of a finished product.

[0045] Regarding the cooling kiln 4, not only should the purpose of cooling and reducing the temperature of petroleum coke be achieved, but also the reasonable control of energy consumption should be ensured. The main motor of the cooling kiln 4 of the present invention uses a variable-frequency motor to drive the rotary cooling kiln 4 and adjust the rotation speed of the cooling kiln, facilitating the control of the cooling process. A material temperature detection sensor is provided at the discharge port of the cooling kiln 4 and is connected to the control system together with the variable-frequency motor. Through the control system, a temperature-rotation speed feedback mechanism is formed, and the rotation speed of the cooling kiln 4 is adjusted according to the set reference value of the discharge material temperature, which can maximize the working potential of the cooling kiln 4.

[0046] In terms of cooling and temperature reduction of the cooling kiln 4, on the one hand, direct cooling of petroleum coke is adopted. A spraying device is provided inside the cooling kiln 4 to cool the first calcined petroleum coke and the second calcined petroleum coke entering the cooling kiln 4. On the other hand, cooling of the kiln body of the cooling kiln 4 is adopted. A water cooling device is provided on the kiln wall and the outer periphery of the cooling kiln 4. The kiln wall is a circulating cooling pipe, and the outer periphery of the kiln is a spraying pipe, which is used to cool the kiln body of the cooling kiln 4 and indirectly reduce the temperature of petroleum coke through heat transfer.

[0047] It should be noted that regardless of whether the petroleum coke rotary calcination process provided by the present invention is adopted, all the above-mentioned various water cooling means are not necessarily all adopted. For example, one or two of them can be selected according to needs.

[0048] Since the present invention rapidly reduces the temperature of the first calcined petroleum coke by means of the low-temperature second calcined petroleum coke, the present invention also has the condition to achieve the purpose of saving cooling water. Let the cooling water spraying flow rate when the cooling kiln 4 only receives the first calcined petroleum coke from the rotary kiln 2 be Q1, and let the cooling water spraying flow rate when the cooling kiln 4 receives both the second calcined petroleum coke and the first calcined petroleum coke from the rotary kiln 2 be Q2. Then, by making Q2 < Q1, the consumption of cooling water is controlled.

[0049] The savings in the above-mentioned cooling water spraying flow rate can not only include the amount of water used for internal spraying of the cooling kiln 4, but also can连带 include the amount of water used for cooling the kiln body of the cooling kiln 4. In the water-saving response mode, one or several cooling water amounts can be adjusted, or in the case of multiple cooling means existing simultaneously, a certain cooling component can be closed. By trying to connect the control valve of the spraying device inside the cooling kiln 4 to the control system and realizing the联动 adjustment of the rotation speed of the cooling kiln and the internal spraying intensity of the cooling kiln with the help of the signal of the material temperature detection sensor, it can not only more flexibly adapt to the mixing and cooling requirements of petroleum coke, but also reduce the waste of water resources in the non-recyclable cooling method, and also optimize the smoke exhaust and heat discharge conditions.

[0050] Example 2

[0051] Figure 2Schematic diagram of the structure of the rotary calcining device used in the petroleum coke rotary calcining process of Example 2 of the present invention, and Figure 1 The difference is that in order to allow the first calcined petroleum coke and the second calcined petroleum coke in Example 1 to obtain a certain degree of auxiliary mixing when they flow in parallel at the inlet of the cooling kiln 4 and then be fed into the cooling kiln 4, an auxiliary mixing component 42 is arranged inside the fourth feeding part 41 to perform auxiliary mixing on the first calcined petroleum coke and the second calcined petroleum coke after the parallel flow. In this embodiment, the auxiliary mixing component 42 adopts a stirring wheel, but mixing components of other structures can also be used.

[0052] One of the purposes of this embodiment is to ensure sufficient heat exchange when the first calcined petroleum coke and the second calcined petroleum coke are mixed, and a more important purpose is that if due to the throughput limitation of the cooling kiln 4, although the operating speed V2 of the cooling kiln 4 has been improved, it is still impossible to achieve the degree of sufficient mixing of the first calcined petroleum coke and the second calcined petroleum coke, then the advance mixing of the auxiliary mixing component 42 can avoid the trouble of adding additional mixing work after unloading the materials in step S3.

[0053] Example 3

[0054] The difference between this embodiment and embodiment 1 or embodiment 2 is that after step S3, the following steps are further included:

[0055] S4: The raw material of the third calcined petroleum coke is transported to the feed port at the kiln tail of the rotary kiln 2, and the third calcined petroleum coke is obtained after rotary calcination in the rotary kiln 2. The third calcined petroleum coke is discharged to the feed port of the cooling kiln 4 through the discharge port at the kiln head.

[0056] S5: At the inlet of the cooling kiln 4, the premixed petroleum coke obtained in step S3 and containing the first calcined petroleum coke and the second calcined petroleum coke, whose temperature is lower than that of the third calcined petroleum coke, is fed into the cooling kiln 4 together with the third calcined petroleum coke from the rotary kiln 2. With the help of the rotation of the cooling kiln 4, the third calcined petroleum coke and the premixed petroleum coke are continuously mixed and heat exchanged in the cooling kiln 4, so that the temperature of the third calcined petroleum coke is accelerated to decrease.

[0057] S6: The third calcined petroleum coke and the premixed petroleum coke are rotated and cooled together through the cooling kiln 4 and then discharged from the discharge port of the cooling kiln 4 to obtain mixed calcined petroleum coke.

[0058] The purpose of this embodiment has been mentioned in Example 1. During the implementation of the steps of Example 1, although the second calcined petroleum coke is fed along the flow according to the set ratio of the petroleum coke product M, in the production described in Example 1, it is possible that not all calcined petroleum cokes required for the petroleum coke product M are mixed along the flow, but the third calcined petroleum coke listed in this embodiment has not yet been organized for calcination production. In this case, with the help of the above steps S4 to S6, the third calcined petroleum coke can be added to the product while being produced, that is, the above third calcined petroleum coke is also the type of petroleum coke required for the petroleum coke product M.

[0059] Obviously, the premixed petroleum coke containing the first calcined petroleum coke and the second calcined petroleum coke obtained in step S3 is preferably naturally cooled to room temperature or ambient temperature before being fed into the cooling kiln 4.

[0060] The control principles of the above steps S4, S5, and S6 can refer to the control principles of the first calcined petroleum coke and the second calcined petroleum coke in steps S1, S2, and S3, and will not be repeated here.

[0061] The solutions provided by the various embodiments of the present invention can be adapted to industrial production and achieve the purpose of reducing costs and increasing efficiency.

[0062] 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 rotary calcination process, characterized in that: The following steps are involved: S1: conveying the raw material of the first calcined petroleum coke to the feed port at the kiln tail of the rotary kiln (2), obtaining the first calcined petroleum coke after rotary calcination in the rotary kiln (2), and discharging the first calcined petroleum coke to the feed port of the cooling kiln (4) through the discharge port at the kiln head; S2: at the inlet of the cooling kiln (4), a second calcined petroleum coke having a lower temperature than the first calcined petroleum coke is fed into the cooling kiln (4) together with the first calcined petroleum coke from the rotary kiln (2) according to a set ratio, and the first calcined petroleum coke and the second calcined petroleum coke are continuously mixed and heat exchanged in the cooling kiln (4) by virtue of the rotation of the cooling kiln (4), so that the temperature of the first calcined petroleum coke is accelerated to decrease; S3: the first calcined petroleum coke and the second calcined petroleum coke are passed through a cooling kiln (4) for rotational cooling, and then discharged from a discharge port of the cooling kiln (4) to obtain mixed calcined petroleum coke; Wherein: the second calcined petroleum coke is a single type of calcined petroleum coke or a mixture of multiple types of calcined petroleum cokes; The set ratio in step S2 is determined according to the ratio of the final petroleum coke product M, and the petroleum coke product M is compounded from a plurality of different calcined petroleum cokes including the first calcined petroleum coke and the second calcined petroleum coke; Assuming that the operating speed of the cooling kiln (4) when receiving only the first calcined petroleum coke from the rotary kiln (2) is V1, and assuming that the operating speed of the cooling kiln (4) when receiving both the second calcined petroleum coke and the first calcined petroleum coke from the rotary kiln (2) is V2, then V2>V1; Assume that the cooling water spray flow rate when the cooling kiln (4) receives only the first calcined petroleum coke from the rotary kiln (2) is Q1, and assume that the cooling water spray flow rate when the cooling kiln (4) receives both the second calcined petroleum coke and the first calcined petroleum coke from the rotary kiln (2) is Q2, then Q2 <Q1; In step S2, the first calcined petroleum coke and the second calcined petroleum coke flow together at the inlet of the cooling kiln (4) and are fed into the cooling kiln (4) after being mixed with the aid of a stirring wheel.

2. The petroleum coke rotary calcination process according to claim 1, characterized in that: In step S2, the second calcined petroleum coke having a lower temperature than the first calcined petroleum coke is a calcined petroleum coke at 20-30°C.

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