Coal solvent extraction reaction system

Abstract

The utility model belongs to the technical field of solvent extraction, and relates to a coal solvent extraction reaction system which comprises an extraction unit, a drying separation unit, a residual coal hydrogenation unit, a separation unit and an extraction filtrate fractionation unit, an extraction residue fractionation unit and a mixed filtrate fractionation unit; the extraction unit is communicated with the mixed filtrate fractionation unit through the drying separation unit and the extraction filtrate fractionation unit in sequence; the drying and separating unit is also communicated with the separating unit through the raffinate coal hydrogenation unit; the separation unit is also respectively communicated with the raffinate filter residue fractionation unit and the mixed filtrate fractionation unit; and the raffinate filter residue fractionation unit is also communicated with the mixed filtrate fractionation unit. According to the utility model, the extracted product can be deeply treated, the recycling is realized, the extraction utilization rate is improved, the pollution of waste residue to the environment is avoided, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solvent extraction and relates to a coal solvent extraction reaction system. Background Art

[0002] Coal is the main energy source for industrial production. However, with the rapid growth of coal production, its impact on resources and the environment has become increasingly apparent. The concentration of CO2 produced by coal combustion continues to increase. Soot pollution caused by coal burning is currently the main type of air pollution. Environmental problems have become a serious obstacle to achieving sustainable economic development, making it urgent to seek efficient and clean methods and ways to utilize coal.

[0003] The basic principle of coal solvent extraction technology is to extract certain components from the coal through the interaction between the solvent and small molecules in the coal, while also removing harmful elements from the coal, thereby reducing the environmental pollution caused by coal combustion. Chinese patent application number CN201310291865.3 discloses a reaction system for coal hot solvent extraction. This system stirs different phases of materials in a premixing and stirring tank, achieving uniform contact and flow within the reaction tube. The system also utilizes multiple sets of premixing and stirring devices and post-processing units in alternating operation to achieve continuous coal hot solvent extraction.

[0004] However, the existing coal solvent extraction system generally directly discharges the solid slag produced by extraction. However, since the solid slag contains useful components, direct discharge not only leads to low coal utilization, but also pollutes the environment. Utility Model Content

[0005] Aiming at the technical problems of low extraction utilization rate and environmental pollution in existing coal extraction, the utility model provides a coal solvent extraction reaction system.

[0006] The utility model is capable of deeply processing the extracted product by arranging an extraction unit, a drying and separation unit, an extracted coal hydrogenation unit, a separation unit, and an extraction filtrate fractionation unit, so as to realize recycling and utilization, improve the extraction utilization rate, avoid environmental pollution caused by waste residue, and achieve the purpose of energy conservation and emission reduction.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A coal solvent extraction reaction system comprises an extraction unit, a drying and separation unit, a raffinate coal hydrogenation unit, a separation unit, an extraction filtrate fractionation unit, a raffinate filter residue fractionation unit and a mixed filtrate fractionation unit;

[0009] The extraction unit is connected in sequence via a drying and separation unit, an extraction filtrate fractionation unit and a mixed filtrate fractionation unit; the drying and separation unit is also connected via an extract coal hydrogenation unit and a separation unit; the separation unit is also connected respectively to an extract residue fractionation unit and a mixed filtrate fractionation unit; the extract residue fractionation unit is also connected to a mixed filtrate fractionation unit.

[0010] It is further defined that the extraction unit includes an extraction tank and an ultrasonic vibrating rod and a stirrer respectively placed outside the extraction tank; one end of the ultrasonic vibrating rod and one end of the stirrer both extend into the extraction tank; and the extraction tank is connected to the drying and separation unit.

[0011] It is further defined that the drying and separation unit includes a plurality of vacuum drying and separation devices arranged in parallel; each vacuum drying and separation device is respectively connected to the extraction tank, the extract coal hydrogenation unit and the extraction filtrate fractionation unit.

[0012] It is further defined that the drying and separation unit further includes a plurality of vacuum pumps; the plurality of vacuum pumps are connected to the plurality of vacuum drying and separators in a one-to-one correspondence.

[0013] It is further defined that the extract coal hydrogenation unit includes an extract coal stirring tank, a heating furnace and a hydrogenation reactor connected in sequence; the extract coal stirring tank is connected to a vacuum drying separator; and the hydrogenation reactor is connected to the separation unit.

[0014] It is further defined that the separation unit includes a gas-liquid separator, a filter and a residue stirring tank connected in sequence; the gas-liquid separator is connected to the hydrogenation reactor, the residue stirring tank is connected to the extract residue fractionation unit; the filter is also connected to the mixed filtrate fractionation unit.

[0015] It is further defined that the extraction filtrate fractionation unit includes an extraction filtrate fractionation tower; the extraction filtrate fractionation tower is respectively connected to the mixed filtrate fractionation unit and the plurality of vacuum drying separators.

[0016] It is further defined that the raffinate residue fractionation unit includes a raffinate residue fractionation tower connected to the residue stirring tank.

[0017] It is further defined that the coal solvent extraction reaction system further includes an extractant collection tank connected to the extraction filtrate fractionation tower and the raffinate residue fractionation tower respectively.

[0018] It is further defined that the mixed filtrate fractionation unit includes a mixed filtrate fractionation tower and a tower top condensation tank connected in sequence; the mixed filtrate fractionation tower is connected to the extraction filtrate fractionation tower and the filter respectively.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The utility model is equipped with an extraction unit, a drying and separation unit, an extraction coal hydrogenation unit, a separation unit, and an extraction filtrate fractionation unit, which can deeply process the extracted product, realize recycling, improve the extraction utilization rate, avoid the pollution of waste residue to the environment, and achieve the purpose of energy conservation and emission reduction.

[0021] 2. In the present invention, the drying and separation unit comprises multiple vacuum drying and separation units connected in parallel; each vacuum drying and separation unit is connected to the extraction tank, the residual coal hydrogenation unit, and the extraction filtrate fractionation unit. Switching between multiple vacuum drying and separation units ensures continuous reaction and improves the recovery efficiency of the extraction product.

[0022] 3. In the present invention, the extract coal hydrogenation unit includes a sequentially connected extract coal mixing tank, a heating furnace, and a hydrogenation reactor; the extract coal mixing tank is connected to a vacuum drying separator; and the hydrogenation reactor is connected to the separation unit. The extract coal and the hydrogen-donating solvent are mixed in the extract coal mixing tank, and then the temperature is raised by heating to ensure the hydrogenation reaction proceeds, which facilitates the processing and recycling of the extract coal and improves the utilization rate of the coal solvent extraction products.

[0023] 4. The coal solvent extraction reaction system provided by the utility model has a simple structure. Among the final output products, the hydrogen supply reagent and the extractant can be collected and used for system recycling; the non-condensable gas, residue and oil material can be output outside the system for reuse. The entire system does not generate waste residue and waste gas, reduces pollutant emissions, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the coal solvent extraction reaction system provided in Example 1;

[0025] Figure 2 Schematic diagram of the coal solvent extraction reaction system provided in Example 2;

[0026] in:

[0027] 100-extraction unit; 200-drying and separation unit; 300-extracted coal hydrogenation unit; 400-separation unit; 500-extracted filtrate fractionation unit; 600-extracted residue fractionation unit; 700-mixed filtrate fractionation unit;

[0028] 1-extraction tank; 2-ultrasonic vibrator; 3-agitator; 4-heating jacket; 5-extraction pump; 6-vacuum drying separator; 7-coal extract mixing tank; 8-hydrogenation feed pump; 9-heating furnace; 10-hydrogenation reactor; 11-gas-liquid separator; 12-gas-liquid separation pump; 13-filter; 14-residue mixing tank; 15-residue extraction pump; 16-filtrate pump; 17-extraction filtrate fractionation tower; 18-residue fractionation tower; 19-extraction filtrate fractionation tower bottom pump; 20-residue fractionation tower bottom pump; 21-mixed filtrate fractionation tower; 22-mixed liquid delivery pump; 23-mixed filtrate fractionation tower bottom pump; 24-tower top condenser; 25-vacuum pump; 26-extraction agent collection tank; E1-first heater; E2-second heater; E3-third heater; E4-fourth heater. DETAILED DESCRIPTION

[0029] The technical solutions protected by this utility model are now described in detail with reference to the accompanying drawings and embodiments. However, it is clear that the described embodiments are only a portion of the embodiments of this application, and not all of them. Based on the described embodiments of this application, all other embodiments derived by persons of ordinary skill in the art without requiring creative effort are also within the scope of protection of this application.

[0030] Unless otherwise defined, the technical or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0031] Example 1

[0032] See also Figure 1This embodiment provides a coal solvent extraction reaction system, including an extraction unit 100, a drying and separation unit 200, a raffinate coal hydrogenation unit 300, a separation unit 400, an extraction filtrate fractionation unit 500; an extraction residue fractionation unit 600 and a mixed filtrate fractionation unit 700; the extraction unit 100 is sequentially connected to the drying and separation unit 200, the extraction filtrate fractionation unit 500 and the mixed filtrate fractionation unit 700; the drying and separation unit 200 is also connected to the separation unit 400 via the raffinate coal hydrogenation unit 300; the separation unit 400 is also respectively connected to the extraction residue fractionation unit 600 and the mixed filtrate fractionation unit 700; the extraction residue fractionation unit 600 is also connected to the mixed filtrate fractionation unit 700.

[0033] In this embodiment, the extraction unit 100 is used to allow coal and the extractant to undergo an extraction reaction to obtain an extraction mixture; the drying and separation unit 200 is used to dry and separate the extraction mixture obtained by the extraction unit 100 to obtain residual coal and an extract; the residual coal hydrogenation unit 300 is used to perform a hydrogenation reaction on the residual coal; the separation unit 400 is used to separate the products of the hydrogenation reaction to obtain non-condensable gas, filter residue and filtrate; the extraction filtrate fractionation unit 500 is used to fractionate the extract to obtain an extractant and a residual liquid; the extraction residue fractionation unit 600 is used to fractionate the filter residue to obtain an extractant, a residual liquid and a residue (as a gasification raw material); the mixed filtrate fractionation unit 700 is used to perform mixed fractionation on the filtrate obtained by the separation unit 400, the residual liquid obtained by the extraction filtrate fractionation unit 500 and the residual liquid obtained by the extraction residue fractionation unit 600 to obtain non-condensable gas, a hydrogen supply reagent and a hydrogenation raw material.

[0034] The coal solvent extraction reaction system provided in this embodiment has the following working process:

[0035] The extractant (carbon disulfide, acetone, N-methylpyrrolidone solvent, dichloromethane, tetrahydrofuran, cyclohexanone or pyridine) and coal (200 mesh to 1000 mesh) are added into the extraction unit 100 at a mass ratio of 5:1. The extractant and coal are fully mixed at a temperature of 25°C to 68°C and under stirring. The organic matter in the coal is better integrated into the extractant. The fully extracted coal and the extractant enter the drying and separation unit 200 together, and dry raffinate coal and extract are obtained through drying and separation.

[0036] The extractive coal at the top of the drying and separation unit 200 is transported to the extractive coal hydrogenation unit 300. At the same time, a hydrogen supply solvent (such as decahydronaphthalene, tetrahydronaphthalene, phenanthrene or n-hexane) and extractive coal mass ratio of (9:1) to (5:1) is added to the extractive coal hydrogenation unit 300, and the mixture is heated to 305-330°C. Then, at a temperature of 290-325°C, a pressure of 1.0 MPa-2.5 MPa, and the action of catalyst and hydrogen, the extractive coal is fully hydrogenated. After heat exchange, the reaction product enters the separation unit 400 to separate the filtrate and the filter residue; the separation unit 400 is used for separation of the filtrate and the filter residue. The residue from the bottom of the raffinate fractionation unit 600 is mixed with the extractant in a mass ratio of (8:1) to (4:1) and then enters the raffinate fractionation unit 600. The residue, extractant, and raffinate are fractionated at atmospheric pressure to 0.02 MPa and a temperature of 50°C to 105°C. The residue output from the bottom of the raffinate fractionation unit 600 is used as a gasification feedstock. The extractant at the top of the raffinate fractionation unit 600 is collected and drawn off and used as a reaction feedstock in the extraction unit 100 and the separation unit 400. The raffinate from the side of the raffinate fractionation unit 600 enters the mixed filtrate fractionation unit 700 for fractionation. The filtrate separated at the bottom of the separation unit 400 also enters the mixed filtrate fractionation unit 700 for fractionation.

[0037] The extract separated from the bottom of the drying and separation unit 200 enters the extraction filtrate fractionation unit 500, and is fractionated at normal pressure to 0.02 MPa and a temperature of 50°C to 120°C to obtain an extractant and a raffinate; the extractant at the top of the extraction filtrate fractionation unit 500 is extracted and collected and used as a reaction raw material in the extraction unit 100 and the separation unit 400; the raffinate at the bottom of the extraction filtrate fractionation unit 500 enters the mixed filtrate fractionation unit 700 for fractionation.

[0038] All liquids entering the filtrate fractionation unit 700 are fractionated at atmospheric pressure to 0.02 MPa and temperature of 70°C to 150°C. The hydrogen supply solvent, non-condensable gas and oil product are respectively extracted from the side line of the filtrate fractionation unit 700. The hydrogen supply solvent is returned to the extract coal hydrogenation unit 300 for recycling, the non-condensable gas is recovered and the oil product is reused as a hydrogenation raw material.

[0039] Example 2

[0040] See also Figure 1 In this embodiment, a coal solvent extraction reaction system is provided, in which the extraction unit 100 includes an extraction tank 1 and an ultrasonic vibrating rod 2 and a stirrer 3 respectively placed outside the extraction tank 1; one end of the ultrasonic vibrating rod 2 and one end of the stirrer 3 both extend into the extraction tank 1; the extraction tank 1 is connected to the drying and separation unit 200.

[0041] Preferably, the extraction tank 1 is cylindrical and externally provided with a heating jacket 4 for heating the extraction tank 1. Preferably, heating of the extraction tank 1 is achieved by passing a heat medium into the heating jacket 4. A coal feedstock inlet pipe and an extractant inlet pipe are externally connected to the top sidewall of the extraction tank 1, for respectively introducing coal and extractant into the extraction tank 1. A discharge port is provided at the bottom of the extraction tank 1 for discharging the mixed material in the extraction tank 1 into the drying and separation unit 200.

[0042] Preferably, in order to ensure that the raw materials in the extraction tank 1 are fully mixed, an agitator 3 and an ultrasonic vibrating rod 2 are also provided in the extraction tank 1. The agitator 3 is a paddle stirring device and is driven by a motor. One end of the paddle stirring device is located in the extraction tank 1, and the other end of the paddle stirring device is located outside the extraction tank 1 and connected to the motor; one end of the ultrasonic vibrating rod 2 is located in the extraction tank 1, and the other end of the ultrasonic vibrating rod 2 is located outside the extraction tank 1 and connected to the ultrasonic generating device.

[0043] In this embodiment, the drying and separation unit 200 includes a plurality of vacuum drying and separation devices 6 arranged in parallel; each vacuum drying and separation device 6 is connected to the extraction tank 1, the extract coal hydrogenation unit 300 and the extract filtrate fractionation unit 500 respectively.

[0044] In this embodiment, the vacuum drying separator 6 is a cylindrical structure, a filter screen is provided on the cross section of its interior, a nitrogen blowpipe is provided below the filter screen, and a vacuum pump 25 is connected to the lower side of the vacuum drying separator 6 for evacuating the vacuum drying separator 6. The extracted product coming out of the extraction tank 1 enters the side above the filter screen of the vacuum drying separator 6. Under a vacuum environment with a pressure of 0.2KPa to 0.6KPa and a temperature of 80°C to 150°C, the residual coal in the extract is dried and retained above the filter screen, and the extract flows out from the bottom of the vacuum drying separator 6 through the filter screen; then nitrogen is blown from the nitrogen blowpipe to the filter screen above, and the dried residual coal is blown out from the top of the vacuum drying separator 6 after breaking the vacuum.

[0045] In this embodiment, the drying and separation unit 200 further includes a plurality of vacuum pumps 25 ; the plurality of vacuum pumps 25 are connected to the plurality of vacuum drying and separation devices 6 in a one-to-one correspondence.

[0046] Preferably, two vacuum drying separators 6 are used alternately. When the pressure of the first vacuum drying separator 6 reaches 0.2 kPa, the second vacuum drying separator 6 is immediately switched to perform filtration and drying. Simultaneously, nitrogen is introduced into the first vacuum drying separator 6 to break the vacuum, then backflush the first vacuum drying separator 6 to deliver the dried raffinate coal to the raffinate coal hydrogenation unit 300.

[0047] In this embodiment, the extract coal hydrogenation unit 300 includes an extract coal stirring tank 7, a heating furnace 9 and a hydrogenation reactor 10 connected in sequence; the extract coal stirring tank 7 is connected to the vacuum drying separator 6; and the hydrogenation reactor 10 is connected to the separation unit 400.

[0048] In this embodiment, the separation unit 400 includes a gas-liquid separator 11, a filter 13 and a residue stirring tank 14 which are connected in sequence; the gas-liquid separator 11 is connected to the hydrogenation reactor 10, and the residue stirring tank 14 is connected to the extract residue fractionation unit 600; the filter 13 is also connected to the mixed filtrate fractionation unit 700.

[0049] In this embodiment, the extraction filtrate fractionation unit 500 includes an extraction filtrate fractionation tower 17 ; the extraction filtrate fractionation tower 17 is connected to the mixed filtrate fractionation unit 700 and the plurality of vacuum drying separators 6 , respectively.

[0050] In this embodiment, the raffinate residue fractionation unit 600 includes a raffinate residue fractionation tower 18 connected to the residue stirring tank 14 .

[0051] In this embodiment, the coal solvent extraction reaction system further includes an extractant collecting tank 26 connected to the extraction filtrate fractionation tower 17 and the raffinate residue fractionation tower 18 respectively.

[0052] In this embodiment, the mixed filtrate fractionation unit 700 includes a mixed filtrate fractionation tower 21 and a tower top condensation tank 24 which are connected in sequence; the mixed filtrate fractionation tower 21 is connected to the extraction filtrate fractionation tower 17 and the filter 13 respectively.

[0053] The coal solvent extraction reaction system provided in this embodiment has the following working process:

[0054] The extractant (carbon disulfide, acetone, N-methylpyrrolidone solvent, dichloromethane, tetrahydrofuran, cyclohexanone or pyridine) and coal (200 mesh to 1000 mesh) are added to the extraction tank 1 at a mass ratio of 5:1. The extraction tank 1 is heated by the heating jacket 4 and stirred by the stirrer 3 at a temperature of 25°C to 68°C and a stirring speed of 200 to 1000 r / min. The extractant and the coal are fully mixed. At the same time, the ultrasonic effect of the ultrasonic vibration rod 2 allows the organic matter in the coal to be better integrated into the extractant. The power of the ultrasonic vibration rod 2 is 2KW to 10KW and the frequency is 20KHz to 100KHz.

[0055] The fully extracted coal and the extractant are transported together via the extraction pump 5 to the vacuum drying filter 6. Two vacuum drying separators 6 are provided, which are used alternately and are evacuated using the vacuum pump 25. When the pressure of one vacuum drying separator 6 reaches 0.2 kPa, the other is immediately switched to perform filtration and drying. During operation, a filter screen is provided on the cross section of the vacuum drying separator 6 to separate the vacuum-dried residual coal from the extract. The residual coal is located above the filter screen, and the extract flows out of the bottom of the vacuum drying filter 6 through the filter screen. Nitrogen is introduced into the vacuum drying separator 6 that has stopped filtration and drying to break the vacuum, and then backflushing is performed to transport the dried residual coal from the top of the vacuum drying separator 6 to the residual coal mixing tank 7. The pressure within the vacuum drying separator 6 is 0.2 kPa to 0.6 kPa, and the temperature is 80°C to 150°C.

[0056] A hydrogen supply solvent is passed through the extract coal stirring tank 7, and the hydrogen supply solvent (such as decahydronaphthalene, tetrahydronaphthalene, phenanthrene or n-hexane) and the extract coal are uniformly mixed in the extract coal stirring tank 7 according to a mass ratio of (9:1) to (5:1). The mixture is then transported to a heating furnace 9 through a hydrogenation feed pump 8, heated to 305-330° C., and then enters a hydrogenation reactor 10. At the same time, hydrogen with a purity of 99.9% is introduced into the hydrogenation reactor 10. At a temperature of 290-325° C. and a pressure of 1.0 MPa-2.5 MPa, the extract coal is fully hydrogenated under the action of a catalyst and hydrogen. The hydrogenation reaction products are sequentially passed through the first heat exchanger E1 and the second heat exchanger E2 for heat exchange with the raffinate and the filtrate respectively, and then the reaction products are cooled to 150°C to 170°C and then enter the gas-liquid separator 11 for separation. The non-condensable gas and hydrogen generated from the top of the gas-liquid separator 11 are recycled and utilized. The liquid coming out of the bottom of the gas-liquid separator 11 is transported to the filter 13 through the gas-liquid separation pump 12. The filtrate and the residue in the liquid are effectively separated by filtration in the filter 13, and the filtrate enters the mixed filtrate fractionation tower 21 for further separation. The filter residue enters the filter residue stirring tank 14, in which the extractant is added according to the mass ratio of the extractant to the coal (8:1) to (4:1). After sufficient extraction, it is transported to the extract residue fractionation tower 18 through the filter residue extraction pump 15, and fractionated at normal pressure to 0.02 MPa and 50°C to 105°C. The extractant is extracted from the top of the extract residue fractionation tower 18, recovered and stored in the extractant collection tank 26, and returned to the extraction tank 1 and the filter residue stirring tank 14 for recycling. The residue is removed from the bottom of the extract residue fractionation tower 18 as a gasification raw material, and the raffinate at the bottom of the extract residue fractionation tower 18 is extracted by the extract residue fractionation tower bottom pump 20 and enters the mixed filtrate fractionation tower 21 for further separation.

[0057] The extract flowing out from the bottom of the vacuum drying separator 6 is pressurized by the filtrate pump 16 and heated by the fourth heat exchanger E4, and then enters the extraction filtrate fractionation tower 17, where fractionation is completed at normal pressure to 0.02 MPa and temperature of 50°C to 120°C. The extractant extracted from the top of the extraction filtrate fractionation tower 17 is recovered and stored in the extractant collection tank 26 and returned to the extraction tank 1 and the residue stirring tank 14 for recycling; the raffinate at the bottom of the extraction filtrate fractionation tower 17 is extracted by the extraction filtrate fractionation tower bottom pump 19 and enters the mixed filtrate fractionation tower 21 for further separation.

[0058] The raffinate extracted from the extract residue fractionation tower bottom pump 20, the raffinate extracted from the extract filtrate fractionation tower bottom pump 19 and the filtrate of the filter 13 are mixed and enter the mixed liquid delivery pump 22, and after being heated by the third heat exchanger E3, enter the mixed filtrate fractionation tower 21, and distilled into hydrogen supply solvent, light components and oil products at a pressure of normal pressure to 0.02 MPa and a temperature of 70°C to 150°C. The hydrogen supply solvent is withdrawn from the side line of the mixed filtrate fractionation tower 21 and returned to the system for recycling; the light components inside the mixed filtrate fractionation tower 21 are converted into non-condensable gas and condensate through the tower top condenser 24, the non-condensable gas is recycled, and the condensate and the oil product at the bottom of the mixed filtrate fractionation tower 21 are mixed and transported out of the system through the mixed filtrate fractionation tower bottom pump 23 to be used as hydrogenation raw materials.

[0059] It is particularly noted that the present invention protects the structure of the coal solvent extraction reaction system. The type of extractant, type of hydrogen-donating solvent, type of catalyst for the hydrogenation reaction, mass ratio of raw materials, reaction pressure, reaction temperature, etc. can all be designed and selected according to the actual extraction process, and the design selection is based on the existing technology of coal solvent extraction and hydrogenation reaction, and is not specifically limited here.

[0060] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A coal solvent extraction reaction system, characterized in that: It comprises an extraction unit (100), a drying and separation unit (200), a raffinate coal hydrogenation unit (300), a separation unit (400), an extraction filtrate fractionation unit (500), a raffinate filter residue fractionation unit (600) and a mixed filtrate fractionation unit (700); The extraction unit (100) is sequentially connected to a drying and separation unit (200), an extraction filtrate fractionation unit (500), and a mixed filtrate fractionation unit (700); the drying and separation unit (200) is further connected to an extract coal hydrogenation unit (300) and a separation unit (400); the separation unit (400) is further connected to an extract residue fractionation unit (600) and a mixed filtrate fractionation unit (700), respectively; the extract residue fractionation unit (600) is further connected to a mixed filtrate fractionation unit (700).

2. The coal solvent extraction reaction system according to claim 1, characterized in that: The extraction unit (100) comprises an extraction tank (1) and an ultrasonic vibration rod (2) and a stirrer (3) respectively placed outside the extraction tank (1); one end of the ultrasonic vibration rod (2) and one end of the stirrer (3) both extend into the extraction tank (1); and the extraction tank (1) is connected to a drying and separation unit (200).

3. The coal solvent extraction reaction system according to claim 2, characterized in that: The drying and separation unit (200) comprises a plurality of vacuum drying and separation devices (6) arranged in parallel; each vacuum drying and separation device (6) is respectively connected to the extraction tank (1), the residual coal hydrogenation unit (300) and the extraction filtrate fractionation unit (500).

4. The coal solvent extraction reaction system according to claim 3, characterized in that: The drying and separation unit (200) further comprises a plurality of vacuum pumps (25); the plurality of vacuum pumps (25) are connected to the plurality of vacuum drying separators (6) in a one-to-one correspondence.

5. The coal solvent extraction reaction system according to claim 3, characterized in that: The extract coal hydrogenation unit (300) comprises an extract coal stirring tank (7), a heating furnace (9) and a hydrogenation reactor (10) which are connected in sequence; the extract coal stirring tank (7) is connected to a vacuum drying separator (6); and the hydrogenation reactor (10) is connected to a separation unit (400).

6. The coal solvent extraction reaction system according to claim 5, characterized in that: The separation unit (400) comprises a gas-liquid separator (11), a filter (13) and a filter residue stirring tank (14) which are connected in sequence; the gas-liquid separator (11) is connected to the hydrogenation reactor (10), the filter residue stirring tank (14) is connected to the extract filter residue fractionation unit (600); the filter (13) is also connected to the mixed filtrate fractionation unit (700).

7. The coal solvent extraction reaction system according to claim 6, characterized in that: The extraction filtrate fractionation unit (500) comprises an extraction filtrate fractionation tower (17); the extraction filtrate fractionation tower (17) is respectively connected to the mixed filtrate fractionation unit (700) and the plurality of vacuum drying separators (6).

8. The coal solvent extraction reaction system according to claim 7, characterized in that: The raffinate residue fractionation unit (600) includes a raffinate residue fractionation tower (18) connected to the residue stirring tank (14).

9. The coal solvent extraction reaction system according to claim 8, characterized in that: The coal solvent extraction reaction system further comprises an extractant collecting tank (26) which is respectively connected to the extraction filtrate fractionation tower (17) and the extraction residue fractionation tower (18).

10. The coal solvent extraction reaction system according to claim 7, 8 or 9, characterized in that: The mixed filtrate fractionation unit (700) comprises a mixed filtrate fractionation tower (21) and a tower top condensation tank (24) which are connected in sequence; the mixed filtrate fractionation tower (21) is connected to the extraction filtrate fractionation tower (17) and the filter (13) respectively.

Images