Coal tar deep processing system

Abstract

The utility model belongs to the technical field of coal tar deep processing, and particularly relates to a coal tar deep processing system. Comprising a primary evaporator and a first tubular furnace, and the feeding end of the first tubular furnace is connected with a coarse asphalt return pipe; the secondary evaporator is connected with a second-section coal tar feeding pipe and a second-section coal tar discharging pipe; and the feeding end of the asphalt production device is connected with the second-section coal tar discharging pipe. The heated coal tar is fed into the primary evaporator, the material at the tower bottom of the primary evaporator is heated by the first tubular furnace and is fed into the secondary evaporator, and the coarse asphalt extracted from the tower bottom of the secondary evaporator is directly fed into the asphalt production system for continuous production, so that the cooling generated in the asphalt collection assembly is avoided; meanwhile, the coarse asphalt is fed into the first tubular furnace through the coarse asphalt return pipe for reheating circulation, so that the coarse asphalt can be maintained at a relatively high temperature, cooling solidification is avoided, a traditional tubular heating furnace is omitted, and the operation cost and the energy consumption are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coal tar deep processing, specifically relates to a coal tar deep processing system. BACKGROUND

[0002] Coal tar deep processing refers to that light oil, phenol oil, industrial naphthalene, asphalt and other products with higher added value are separated through processes such as fractionation by taking coal tar as raw material. When asphalt is prepared by taking coal tar as raw material, the coal tar after dehydration is heated to 380 DEG C ~ 405 DEG C through a tubular furnace, and then light oil, three mixed oil and crude asphalt and other products are obtained through fractionation. In the prior art, the crude asphalt obtained through fractionation is usually temporarily stored in an asphalt tank, and then is transported to an asphalt production system. For example, the Chinese utility model patent with the application number CN202120268031.0 discloses a coal tar deep processing system with high waste heat recovery utilization rate, which comprises a tubular furnace, a primary evaporator, a secondary evaporator, a fractionating tower and a coal tar feeding pipe. The coal tar after pretreatment such as dehydration firstly passes through the coal tar feeding pipe, exchanges heat with a first three mixed oil cooler and a first anthracene oil cooler arranged at the bottom of the fractionating tower, is sent into the primary evaporator after recovering waste heat in three mixed oil discharge and anthracene oil discharge of the fractionating tower, and recovers light components contained in the coal tar. The material at the bottom of the primary evaporator is sent into the secondary evaporator after being heated by the tubular furnace, and crude asphalt is extracted at the bottom of the secondary evaporator. The crude asphalt enters an asphalt collecting assembly and is then transported to the asphalt production system. However, in actual production, the temperature of the crude asphalt may decrease in the asphalt collecting assembly, which affects the next step of production. In this case, a transport pump and a tubular heating furnace are additionally arranged in the production site to heat the crude asphalt again, so that the crude asphalt can be kept at the required temperature, but the operation cost and energy consumption are increased. SUMMARY

[0003] Therefore, the coal tar deep processing system is provided to solve the technical problems that the temperature of the crude asphalt may decrease in the asphalt collecting assembly in the prior art, which affects the next step of production, and the additional transport pump and tubular heating furnace increase the operation cost and energy consumption.

[0004] The technical scheme for solving the above technical problems of the present application is as follows:

[0005] A coal tar deep processing system comprises:

[0006] A primary evaporator, a section of coal tar feeding pipe and a section of coal tar discharge pipe are connected to the primary evaporator;

[0007] A first tubular furnace, the feeding end of the first tubular furnace is connected to the section of coal tar discharge pipe, and a crude asphalt backflow pipe is further connected to the feeding end of the first tubular furnace;

[0008] a secondary evaporator, a second coal tar feed pipe and a second coal tar discharge pipe are connected to the secondary evaporator, the second coal tar feed pipe is connected to the discharge end of the first pipe furnace, and the second coal tar discharge pipe is connected to the crude pitch reflux pipe;

[0009] a pitch production device, a feed end of the pitch production device is connected to the second coal tar discharge pipe.

[0010] Preferably, the coal tar deep processing system further comprises a second pipe furnace, a coal tar feed pipe is connected to the second pipe furnace, and a discharge end of the second pipe furnace is connected to the first coal tar feed pipe.

[0011] Preferably, the coal tar deep processing system, the second coal tar discharge pipe is further connected to an emergency pitch temporary storage device, the emergency pitch temporary storage device temporarily stores crude pitch, and the emergency pitch temporary storage device is connected to the pitch production device.

[0012] Preferably, the coal tar deep processing system, the emergency pitch temporary storage device comprises a pitch tank and a feeding pump, a feed end of the pitch tank is connected to the second coal tar discharge pipe, a discharge end of the pitch tank is connected to a feed end of the feeding pump, and a discharge end of the feeding pump is connected to a feed end of the first pipe furnace.

[0013] Preferably, the coal tar deep processing system, the emergency pitch temporary storage device further comprises a third pipe furnace, a feed end of the third pipe furnace is connected to a discharge end of the feeding pump, and the feed end of the third pipe furnace is connected to the pitch production device.

[0014] Preferably, the coal tar deep processing system, the second coal tar discharge pipe and the crude pitch reflux pipe are both provided with control valves.

[0015] Preferably, the coal tar deep processing system, a primary light oil recovery assembly is further connected to the primary evaporator, and the primary light oil recovery assembly is used to recover light oil at the top of the primary evaporator.

[0016] Preferably, the coal tar deep processing system further comprises a fraction column, a fraction discharge pipe is arranged at the top of the secondary evaporator, a feed end of the fraction column is connected to the fraction discharge pipe, a second light oil recovery assembly is connected to a discharge end at the top of the fraction column, and the second light oil recovery assembly is used to recover light oil at the top of the fraction column.

[0017] Compared with the prior art, the present application has at least the following advantages:

[0018] The application provides a coal tar deep processing system, which comprises a primary evaporator, a first coal tar feeding pipe and a first coal tar discharging pipe connected to the primary evaporator; a first tubular furnace, a feeding end of the first tubular furnace being connected to the first coal tar discharging pipe, and the feeding end of the first tubular furnace being further connected to a crude pitch reflux pipe; a secondary evaporator, a second coal tar feeding pipe and a second coal tar discharging pipe being connected to the secondary evaporator, the second coal tar feeding pipe being connected to a discharging end of the first tubular furnace, and the second coal tar discharging pipe being connected to the crude pitch reflux pipe; and a pitch production device, a feeding end of the pitch production device being connected to the second coal tar discharging pipe. The heated coal tar is fed into the primary evaporator to recover primary light oil contained in the coal tar, the material at the bottom of the primary evaporator is heated to about 400 DEG C through the first tubular furnace and then fed into the secondary evaporator, crude pitch is collected at the bottom of the secondary evaporator, and fraction oil at the top of the secondary evaporator is fed into a fraction column to be fractionally distilled to obtain secondary light oil and three mixed oil. The crude pitch collected at the bottom of the secondary evaporator is directly fed into the pitch production system for continuous production, thereby avoiding temperature drop in the pitch collecting assembly, and the crude pitch is fed into the first tubular furnace through the crude pitch reflux pipe for reheating and recycling, so that the crude pitch collected at the bottom of the secondary evaporator can be maintained at a high temperature to avoid temperature drop and solidification, and on the other hand, the conveying pump and the tubular heating furnace are omitted, thereby reducing operation cost and energy consumption and being more suitable for continuous production occasions. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a coal tar deep processing system of the application.

[0020] In the figure: primary evaporator 100, first coal tar feeding pipe 110, first coal tar discharging pipe 120, primary light oil recovery assembly 130, first tubular furnace 200, crude pitch reflux pipe 210, secondary evaporator 300, second coal tar feeding pipe 310, second coal tar discharging pipe 320, fraction discharging pipe 330, second tubular furnace 400, coal tar feeding pipe 410, emergency pitch temporary storage device 500, pitch tank 510, material conveying pump 520, third tubular furnace 530, pitch production device 600, control valve 700, fraction column 800, secondary light oil recovery assembly 810. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the application, the application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the application are shown in the drawings. However, the application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the application can be more thoroughly and completely understood.

[0022] It is to be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end", and the like are used for the purpose of description and are not intended to limit the application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] Referring to the drawings Figure 1 In one embodiment of the present application, a coal tar deep processing system includes a primary evaporator 100, a first tube furnace 200, a secondary evaporator 300, and a pitch production device 600. The primary evaporator 100 is connected to a first coal tar feed pipe 110 and a first coal tar discharge pipe 120. The first tube furnace 200 is connected to the first coal tar discharge pipe 120. The first tube furnace 200 is also connected to a crude pitch reflux pipe 210. The secondary evaporator 300 is connected to a second coal tar feed pipe 310 and a second coal tar discharge pipe 320. The second coal tar feed pipe 310 is connected to the first tube furnace 200. The second coal tar discharge pipe 320 is connected to the crude pitch reflux pipe 210. The pitch production device 600 is connected to the second coal tar discharge pipe 320.

[0025] The coal tar which has been pretreated by dewatering and the like is heated to about 130°C, and then fed into the primary evaporator 100 through the primary coal tar feed pipe 110. The light components contained in the coal tar are recovered by evaporation in the primary evaporator 100, that is, the primary light oil. The material at the bottom of the primary evaporator 100 is then fed into the first tubular furnace 200 through the primary coal tar discharge pipe 120, heated to about 400°C, and then fed into the secondary evaporator 300 through the secondary coal tar feed pipe 310. The crude pitch produced at the bottom of the secondary evaporator 300 is directly fed into the pitch production device 600 through the secondary coal tar discharge pipe 320. The secondary coal tar discharge pipe 320 is also connected to the primary evaporator 100 through the crude pitch reflux pipe 210, and the crude pitch is fed into the first tubular furnace 200 through the crude pitch reflux pipe 210 for reheating and recycling. This can maintain the crude pitch produced at the bottom of the secondary evaporator 300 at a high temperature, avoid solidification due to temperature drop, ensure the system to operate at a low energy consumption, reduce production cost, and on the other hand, avoid the use of a pump and a tubular heating furnace, reduce operation cost and energy consumption, and be more suitable for continuous production.

[0026] In order to heat the coal tar to the required temperature, as preferred, the coal tar deep processing system further comprises a second tubular furnace 400, which is connected with a coal tar feed pipe 410, and the discharge end of the second tubular furnace 400 is connected with the primary coal tar feed pipe 110. The pretreated coal tar is fed into the second tubular furnace 400 through the coal tar feed pipe 410 for preheating, and then fed into the primary evaporator 100 for evaporation. The preheating can make the coal tar reach the required temperature for evaporation, and meet the production requirements. In actual production and modification, since the crude pitch is directly fed into the pitch production device 600, the tubular furnace for heating the crude pitch is idle, and the tubular furnace can be used as the second tubular furnace 400, which can reduce the equipment investment cost.

[0027] In view of the unexpected situations such as faults that may occur in the pitch production device 600, in a more preferred embodiment, the secondary coal tar discharge pipe 320 is further connected with an accident pitch temporary storage device 500, which temporarily stores the crude pitch, and the accident pitch temporary storage device 500 is connected with the pitch production device 600. The accident pitch temporary storage device 500 can be used to temporarily store the crude pitch produced by the secondary evaporator 300 when the pitch production device 600 fails, and can also be used to temporarily store the unqualified pitch.

[0028] Further, the accident asphalt temporary storage device 500 comprises an asphalt tank 510 and a feeding pump 520. The feeding end of the asphalt tank 510 is connected with the second coal tar outlet pipe, the outlet end of the asphalt tank 510 is connected with the feeding end of the feeding pump 520, and the outlet end of the feeding pump 520 is connected with the feeding end of the first tubular furnace 200. When the asphalt production device 600 fails, the asphalt production device 600 is operated, and the crude asphalt produced from the secondary evaporator 300 is sent into the asphalt tank 510. At this time, the feeding pump 520 sends the crude asphalt to the feeding end of the first tubular furnace 200 for secondary circulation production, which can stabilize the system operation and can also produce the unqualified asphalt in the asphalt tank 510 into qualified products.

[0029] In some extreme cases, the crude asphalt in the asphalt tank 510 is sent to the asphalt production device, and further, the accident asphalt temporary storage device 500 further comprises a third tubular furnace 530. The feeding end of the third tubular furnace 530 is connected with the outlet end of the feeding pump 520, and the feeding end of the third tubular furnace 530 is connected with the asphalt production device 600. In this case, the crude asphalt in the asphalt tank 510 is sent to the third tubular furnace for reheating, so that the crude asphalt is kept at a high temperature, avoiding condensation due to temperature drop, and being easy to produce the next step. Since the asphalt tank 510, the feeding pump 520 and the third tubular furnace 530 are provided as standby devices in the system, these standby devices will not be operated under the normal operation of the system, and will not produce additional energy consumption, but can be used for production as a short-time standby when the main pipeline fails, ensuring the normal production.

[0030] Further, the second coal tar outlet pipe 320 and the crude asphalt return pipe 210 are provided with control valves 700. Each control valve 700 controls the flow state of the material in each pipe according to the production needs.

[0031] In another specific embodiment of the present application, the primary evaporator 100 is further connected with a primary light oil recovery assembly 130, which is used to recover the light oil at the top of the primary evaporator 100. The heated coal tar feed is sent into the primary evaporator 100, and the moisture and the primary light oil are evaporated and recovered by the primary light oil recovery assembly 130 for re-production.

[0032] Further, the coal tar deep processing system further comprises a fraction column 800, a fraction outlet pipe 330 is arranged at the top of the secondary evaporator 300, a feed end of the fraction column 800 is connected to the fraction outlet pipe 330, and a secondary light oil recovery assembly 810 is connected to a discharge end of the fraction column 800, and the secondary light oil recovery assembly 810 is used to recover light oil at the top of the fraction column 800. The fraction oil at the top of the secondary evaporator 300 is transported to the fraction column 800 through the fraction outlet pipe 330 to be fractionally distilled, and the obtained secondary light oil is sent to the secondary light oil recovery assembly 810 through the top of the fraction column 800 to be recovered and then reproduced; a three-mixed oil recovery device is arranged at the discharge end of the column sump of the fraction column 800 to recover three-mixed oil in the column sump.

[0033] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A coal tar deep processing system, characterized in that, The application relates to a coal tar distillation device, which comprises the following parts: a primary evaporator, which is connected with a first coal tar feeding pipe and a first coal tar discharging pipe; a first tubular furnace, the feeding end of which is connected with the first coal tar discharging pipe, and the feeding end of which is also connected with a crude pitch reflux pipe; a secondary evaporator, which is connected with a second coal tar feeding pipe and a second coal tar discharging pipe, the second coal tar feeding pipe being connected with the feeding end of the first tubular furnace, and the second coal tar discharging pipe being connected with the crude pitch reflux pipe; a pitch production device, the feeding end of which is connected with the second coal tar discharging pipe.

2. The coal tar deep processing system of claim 1, wherein, The device further comprises a second tubular furnace, which is connected with a coal tar feeding pipe, and the discharging end of which is connected with the first coal tar feeding pipe.

3. The coal tar deep processing system of claim 1, wherein, The second coal tar discharging pipe is also connected with an emergency pitch temporary storage device, which is used for temporarily storing crude pitch and is connected with the pitch production device.

4. The coal tar deep processing system of claim 3, wherein, The emergency pitch temporary storage device comprises a pitch tank and a feeding pump, the feeding end of the pitch tank being connected with the second coal tar discharging pipe, the discharging end of the pitch tank being connected with the feeding end of the feeding pump, and the discharging end of the feeding pump being connected with the feeding end of the first tubular furnace.

5. The coal tar deep processing system of claim 4, wherein, The emergency pitch temporary storage device further comprises a third tubular furnace, the feeding end of which is connected with the discharging end of the feeding pump, and the feeding end of which is connected with the pitch production device.

6. The coal tar deep processing system of claim 1, wherein, The second coal tar discharging pipe and the crude pitch reflux pipe are both provided with control valves.

7. The coal tar deep processing system of claim 1, wherein, The primary evaporator is also connected with a primary light oil recovery assembly, which is used for recovering the light oil at the top of the primary evaporator.

8. The coal tar deep processing system of claim 1, wherein, The device further comprises a fraction tower, the top of the secondary evaporator being provided with a fraction discharging pipe, the feeding end of the fraction tower being connected with the fraction discharging pipe, and the top of the fraction tower being connected with a secondary light oil recovery assembly, which is used for recovering the light oil at the top of the fraction tower.

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