CN109628123B

CN109628123B - Coal tar dehydration process

Info

Publication number: CN109628123B
Application number: CN201910064739.1A
Authority: CN
Inventors: 高德俊; 单涛; 任庆民
Original assignee: Yulin City Yushen Industrial Zone Huahang Energy Co ltd
Current assignee: Yulin City Yushen Industrial Zone Huahang Energy Co ltd
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2020-12-04
Anticipated expiration: 2039-01-23
Also published as: CN109628123A

Abstract

The embodiment of the invention discloses a coal tar dehydration method, relating to the technical field of coal tar deep processing; the method comprises the following steps: s1, compressing and drying the air; s2, fully mixing the compressed dry air in the step S1 with the coal tar; s3, fully mixing the hot steam with the coal tar in the step S2; s4, heating the gas-liquid mixture in the step S3; and S5, after the water in the coal tar is fully evaporated, carrying out gas-liquid separation on the mixture. The method is used for solving the problem that the content of the coal tar water is not up to the standard due to insufficient dehydration of the coal tar in the prior art.

Description

Coal tar dehydration process

Technical Field

The embodiment of the invention relates to the technical field of deep processing of coal tar, and particularly relates to a coal tar dehydration method.

Background

Coal tar is a black or black brown viscous liquid obtained by dry distillation of coal. Coal tar is very rich in composition, and the types of the hydrocarbon can reach tens of thousands, so that the coal tar becomes an important raw material in the coal chemical industry.

Coal tar typically contains a large amount of water, which has a very adverse effect on the subsequent processing and utilization of the coal tar. It is therefore necessary to remove the water from the coal tar before it is subsequently processed. However, water in coal tar forms a water-in-oil, oil-in-water emulsion with oil, which makes water removal from coal tar very difficult.

This emulsified system is broken, typically by mixing with coal tar using a demulsifier, and the water from the coal tar is removed by a separation treatment. Most of coal tar has specific gravity larger than that of water or close to that of water, so that the coal tar and the water are difficult to separate in the deep processing process of the coal tar, and the coal tar and the water with large specific gravity difference can be separated by adopting a standing sedimentation mode at present. But the separation cannot be realized when the contrast weight difference is small, and the processing difficulty of the coal tar is seriously increased.

Coal tar produced on the existing coal chemical industry device contains more than 1.5 percent of water, and generally exceeds more than 5 percent. However, further processing of coal tar typically requires that the coal tar contain less than 0.5% water, and at the very least less than 1%. However, most of the coal tar is difficult to separate because the specific gravity of the coal tar is greater than or close to that of water, and generally, after most of the water is removed in a standing mode as much as possible in production, the coal tar is barely put into a device to be heated to over 180 ℃ to vaporize the water, so that the coal tar is dehydrated, but the energy consumption is large.

Disclosure of Invention

Therefore, the embodiment of the invention provides a tar dehydration method to solve the problem that the content of coal tar water is not up to the standard due to insufficient dehydration of coal tar in the prior art.

In order to achieve the above object, an embodiment of the present invention provides the following:

in an embodiment of the present invention, there is provided a coal tar dewatering process comprising the steps of:

s1, compressing and drying the air;

s2, fully mixing the compressed dry air in the step S1 with the coal tar;

s3, fully mixing the hot steam with the coal tar in the step S2;

s4, heating the gas-liquid mixture in the step S3;

and S5, after the water in the coal tar is fully evaporated, carrying out gas-liquid separation on the mixture.

Preferably, the heating temperature in step S4 is 180 ℃ to 200 ℃.

Preferably, in step S5, the method includes the following steps: step S51, standing the mixture to realize primary gas-liquid separation; pumping out the gas, and removing the coal tar from a finished product area; and S52, carrying out secondary separation on the gas, mixing the coal tar with the coal tar in the S51, and discharging the gas.

Preferably, in step S51 and step S52, the mixed solution is continuously heated to a temperature of 200 ℃ to 220 ℃.

Preferably, in step S52, the gas is filtered to separate the coal tar and the gas.

Preferably, the mixing ratio of the compressed dry air to the hot steam is 1-3:1 in steps S2 and S3.

Preferably, the gas-liquid mixture is heated for 15 to 30 minutes in step S4.

Preferably, the coal tar is continuously stirred during the heating process.

According to the embodiment of the invention, the following advantages are provided:

1. according to the embodiment of the invention, the compressed air and the steam are supplied, the provided dry compressed air is used for vaporizing the moisture in the coal tar into the air in the heating process by utilizing the principle that water is saturated in the air and has partial pressure, so that the moisture in the coal tar is separated out, and the process can be used for simply and quickly removing the moisture in the coal tar, so that the problem of difficulty in dewatering the coal tar is thoroughly solved.

2. According to the embodiment of the invention, through the process of separating the coal tar from the steam, the coal tar is continuously heated in the separation process, so that the temperature of the coal tar is kept at a higher temperature, and the steam cannot be cooled and condensed again when the coal tar is separated from the steam.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a flow chart of a coal tar dewatering method according to a first embodiment of the present invention;

FIG. 2 is a schematic view of an overall structure of a coal tar dewatering device according to a second embodiment of the present invention;

FIG. 3 is a schematic diagram of a protruded blender in a coal tar dewatering device according to a second embodiment of the present invention;

FIG. 4 is a schematic view of a protruded heating device in a coal tar dewatering equipment provided in the second embodiment of the present invention;

FIG. 5 is a schematic view of a protruded gas dissolving device in coal tar dewatering equipment according to the second embodiment of the present invention;

fig. 6 is a schematic diagram of a separation device in coal tar dewatering equipment according to the second embodiment of the present invention.

In the figure: 1. a mixer; 11. a mixing barrel; 111. a feed inlet; 112. a discharge port; 12. stirring blades; 13. a mixing motor; 2. a compressed air supply device; 21. an air compressor; 22. a dryer; 23. a control switch; 3. a feeding device; 31. a feed conduit; 32. a water pump; 33. a one-way valve; 4. a heating device; 41. a heating barrel; 42. a first heating sheet; 43. a temperature sensor; 5. a steam supply assembly; 51. a steam generator; 52. a control valve; 53. a steam line; 6. a gas dissolving device; 61. a gas dissolving barrel; 62. a screw blade; 63. a drive motor; 64. a second heating plate; 7. a separation device; 71. standing the barrel; 72. an oil liquid discharge pipeline; 721. a second control ball valve; 73. an oil outlet pump; 74. an air outlet pipe; 75. a secondary separation assembly; 751. a filter vat; 752. a filter screen; 753. an oil return conduit; 754. an exhaust pipe; 755. a first control ball valve; 76. a third heating plate; 8. a feed line; 81. a pipeline ball valve.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.

Example one

A coal tar dewatering process, as shown in figure 1, comprising the steps of:

s1, compressing and drying the air;

s2, fully mixing the compressed dry air in the step S1 with the coal tar;

s3, fully mixing the hot steam with the coal tar in the step S2;

s4, heating the gas-liquid mixture in the step S3;

In step S1, the air is compressed and dried, and in this step, it is preferable to compress the air and then dry the air to prevent secondary liquefaction of the vapor during the process of compressing the air. The drying process is deep drying.

In steps S2 and S3, the mixing ratio of the compressed dry air to the hot steam is 1-3: 1.

The gas-liquid mixture is heated for 15 to 30 minutes in step S4. In the heating process, the heating temperature is controlled to be 180-200 ℃. While the coal tar is continuously stirred. Through stirring, the water vapor in the coal tar can be quickly evaporated.

In step S5, the method includes the steps of:

step S51, standing the mixture to realize primary gas-liquid separation; pumping out the gas, and removing the coal tar from a finished product area;

and S52, carrying out secondary separation on the gas, mixing the coal tar with the coal tar in the S51, and discharging the gas.

In step S51 and step S52, the mixture is heated continuously, and the temperature is maintained at 200-220 ℃. This temperature is higher than the heating temperature in step S4, thereby ensuring, to a certain extent, that the water vapor does not liquefy secondarily during the gas-liquid separation, and thus ensuring the purity of the coal tar during the gas-liquid separation.

In step S52, the gas is filtered to separate the coal tar and the gas. By filtering the gas, the coal tar liquid drops in the gas can be filtered to prevent the coal tar liquid drops from entering the air.

Example two

A coal tar dehydration device is shown in figure 2 and comprises a mixer 1, a heating device 4, a gas dissolving device 6 and a separating device 7 through which coal tar sequentially passes, wherein feeding pipelines 8 are connected between the mixer 1 and the heating device 4, between the heating device 4 and the gas dissolving device 6 and between the gas dissolving device 6 and the separating device 7; in use, the mixer also comprises a compressed air supply device 2 connected with the mixer 1, a feeding device 3 connected with the mixer 1 and a steam supply assembly 5 connected with the heating device 4. When the device is used, materials are supplied into the mixer 1 through the arranged feeding device 3, meanwhile, compressed gas is added into the mixer 1 through the arranged compressed air supply device 2, after the materials are fully mixed, the gas-liquid mixture is conveyed to the heating device 4, hot steam is supplied into the heating device 4 through the arranged steam supply assembly 5, the gas-liquid mixture inside is heated, after the materials are heated, the heated gas-liquid mixture is conveyed to the gas dissolving device 6, moisture in coal tar in the gas dissolving device 6 is further separated, and finally gas-liquid separation is carried out at the separation device 7.

In order to conveniently control the time of the coal tar in each step, pipeline ball valves 81 for controlling the connection or disconnection of the feeding pipelines 8 connected between the mixer 1 and the heating device 4, between the heating device 4 and the gas dissolving device 6 and between the gas dissolving device 6 and the separating device 7 are respectively arranged on the feeding pipelines.

As shown in fig. 3, the mixer 1 may be a cylindrical mixer 1 or a funnel-shaped mixer 1, without limitation. Blender 1 includes mixing barrel 11 and sets up at 11 inside stirring leaves 12 of mixing barrel and set up the compounding motor 13 in 11 upper ends of mixing barrel, and when using, drives through the compounding motor 13 that sets up and stirs the material of leaf 12 to inside to make the material intensive mixing. Two feed inlets 111 are arranged at the upper end of the mixing barrel 11, the two feed inlets 111 are respectively connected with the compressed air supply device 2 and the feeding device 3, a discharge outlet 112 is arranged at the other end of the mixing barrel 11, and the discharge outlet 112 is connected with the feeding pipeline 8.

The compressed air supply device 2 comprises an air compressor 21 and a dryer 22 connected between the air compressor 21 and the mixer 1, the air compressor 21, the mixer 1 and the mixing barrel 11 are connected through pipelines, and a control switch 23 for controlling the on-off of air gas is arranged on the pipeline between the dryer 22 and the mixing barrel 11. Air is compressed by an air compressor 21 provided, and moisture in the compressed air is deeply dried by using a dryer 22. Thus, the gas discharged into the mixing bowl 11 is dry gas.

The feeding device 3 comprises a feeding pipeline 31 and a water pump 32 arranged on the feeding pipeline 31, and the materials in the feeding pipeline 31 are added into the mixing barrel 11 through the water pump 32. Further, be provided with check valve 33 on feed pipe 31 and the pipeline section that is located between water pump 32 and compounding bucket 11 to, make the coal tar only have water pump 32 one side row to the compounding bucket 11 in, prevent the risk of coal tar refluence to a certain extent, make and to keep certain pressure in the compounding bucket 11.

With the arrangement, in the process of stirring the coal tar in the mixing barrel 11, the added compressed air is dry air, so that the moisture in the coal tar is primarily gasified and then enters the heating device 4.

As shown in fig. 4, the heating device 4 is disposed below the mixing bowl 11 so that, when the gas-liquid mixture is sufficiently stirred in the mixing bowl 11, the pipe ball valve 81 can be opened to directly discharge into the heating device 4.

The heating device 4 includes a heating tub 41, and a first heating sheet 42 disposed inside the heating tub 41. The steam supply assembly 5 comprises a steam generator 51, and a steam conduit 53 arranged between the steam generator 51 and the heat supply unit, and a control valve 52 arranged on the steam conduit 53. Meanwhile, a temperature sensor 43 for controlling the on/off of the first heating sheet 42 is arranged in the heating barrel 41, when the temperature sensed by the temperature sensor 43 is between 180 ℃ and 200 ℃, the heat supply is stopped, and then the material is conveyed to the air dissolving device 6.

As shown in fig. 5, the air dissolving device 6 is disposed below the heating device 4, and includes an air dissolving barrel 61, an auger blade 62 disposed in the air dissolving barrel 61, a driving motor 63 disposed on the air dissolving barrel 61 and used for driving the auger blade 62 to rotate, and a second heating sheet 64 disposed in the air dissolving barrel 61 and located around the auger blade 62. The second heating plate 64 can continuously heat the gas-liquid mixture, so that the cooling steam of the gas-liquid mixture is prevented from being liquefied. Meanwhile, through stirring, the water vapor in the coal tar can be better evaporated.

The method is characterized in that dry compressed air is blown in, then hot steam is added, and the principle that water is saturated in air and has partial pressure is utilized to gasify moisture in the coal tar into the air, so that the moisture is removed from the coal tar.

As shown in fig. 6, the separator 7 is disposed in parallel with the gas dissolving device 6, and includes a standing tank 71, one side of the standing tank 71 is communicated with the feeding pipe 8, an oil discharging pipe 72 is connected to a lower end of the standing tank 71, an oil discharging pump 73 is disposed on the oil discharging pipe 72, and oil can be periodically discharged through the oil discharging pump 73.

An air outlet pipe 74 is connected to the upper end of the standing tub 71. A secondary separation assembly 75 is connected to one side of the air outlet pipeline 74, which is far away from the standing barrel 71, the secondary separation assembly 75 comprises a filter barrel 751 and a filter screen 752 arranged in the filter barrel 751 and used for filtering oil, an oil return pipeline 753 is connected to the lower end of the filter barrel 751, and an exhaust pipe 754 is arranged on one side of the filter screen 752, which is far away from the oil return pipeline 753; the position where the air outlet pipeline 74 is communicated with the filter barrel 751 is positioned on one side of the filter screen 752 far away from the exhaust pipe 754; through secondary filtration, the coal tar particles carried in the gas can be filtered.

The oil return pipeline 753 is communicated with the oil discharge pipeline 72, and a first control ball valve 755 is arranged on the oil return pipeline 753; a second control ball valve 721 is arranged on the oil liquid discharge pipeline 72, and the second control ball valve 721 is arranged on a pipe section between the connecting point of the oil return pipeline 753 and the oil liquid discharge pipeline 72 and the standing barrel 71. Through this setting, can control the coal tar oil extraction, the two realizes independent work.

In order to prevent the steam from being liquefied again when the gas-liquid temperature becomes low during the gas-liquid separation in use, third heating plates 76 are provided in the standing tub 71 and the filter tub 751, respectively, and the coal tar in the filter tub 751 in the standing tub 71 is heated by the third heating plates 76 so as to be kept at a high temperature, which is generally higher than the heating temperatures of the first heating plate 42 and the second heating plate 64.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A coal tar dehydration method is characterized in that: the method comprises the following steps:

s1, compressing and drying the air;

s2, fully mixing the compressed dry air in the step S1 with the coal tar;

s3, fully mixing the hot steam with the coal tar in the step S2;

s4, heating the gas-liquid mixture in the step S3;

s5, after water in the coal tar is fully evaporated, carrying out gas-liquid separation on the mixture;

s52, secondary separation of the gas is realized, the coal tar is mixed with the coal tar in the S51, and the gas is discharged;

standing the mixture to realize primary gas-liquid separation; pumping out the gas, and removing the coal tar from a finished product area; secondary separation is realized on the gas, the coal tar is mixed with the coal tar in the step S51, and the gas is discharged;

the method also comprises a coal tar dehydration device which comprises a mixer (1), a heating device (4), an air dissolving device (6) and a separating device (7) which are sequentially arranged along the flow direction of the coal tar, wherein feeding pipelines (8) are connected between the mixer (1) and the heating device (4), between the heating device (4) and the air dissolving device (6) and between the air dissolving device (6) and the separating device (7);

the coal tar dehydration device also comprises a compressed air supply device (2) connected with the mixer (1), a feeding device (3) connected with the mixer (1) and a steam supply component (5) connected with the heating device (4);

the mixer (1) comprises a mixing barrel (11), a stirring blade (12) arranged in the mixing barrel (11) and a mixing motor (13) for driving the stirring blade (12) to rotate;

two feed inlets (111) are arranged at one end of the mixing barrel (11) and comprise a first feed inlet (1111) and a second feed inlet (1112), the first feed inlet (1111) is communicated with the compressed air supply device (2), and the second feed inlet (1112) is communicated with the supply device (3);

a discharge hole (112) is formed in the other end of the mixing barrel (11), and the discharge hole (112) is connected with a feeding pipeline (8);

the compressed air supply device (2) comprises an air compressor (21) and a dryer (22) connected between the air compressor (21) and the mixer (1);

the feeding device (3) comprises a feeding pipeline (31), a water pump (32) arranged on the feeding pipeline (31), and a one-way valve (33) which is arranged on the feeding pipeline (31) and is positioned between the water pump (32) and the mixer (1);

the heating device (4) comprises a heating barrel (41) and a first heating sheet (42) arranged in the heating barrel (41);

the steam supply assembly (5) comprises a steam generator (51), a steam pipe (53) connected between the steam generator (51) and the heating tub (41), and a control valve (52) disposed on the steam pipe (53);

pipeline ball valves (81) for controlling the connection or disconnection of the feeding pipelines (8) are respectively arranged on the feeding pipelines (8) connected between the mixer (1) and the heating device (4), between the heating device (4) and the gas dissolving device (6) and between the gas dissolving device (6) and the separating device (7);

the gas dissolving device (6) comprises a gas dissolving barrel (61), an auger blade (62) arranged in the gas dissolving barrel (61), second heating sheets (64) arranged in the gas dissolving barrel (61) and positioned around the auger blade (62), and a driving motor (63) for driving the auger blade (62) to rotate;

the separation device (7) comprises a standing barrel (71), one side of the standing barrel (71) is communicated with a feeding pipeline (8), the lower end of the standing barrel (71) is connected with an oil liquid discharge pipeline (72), and an oil discharge pump (73) is arranged on the oil liquid discharge pipeline (72);

an air outlet pipeline (74) is connected to the upper end of the standing barrel (71);

one side, far away from the standing barrel (71), of the air outlet pipeline (74) is connected with a secondary separation assembly (75), the secondary separation assembly (75) comprises a filter barrel (751) and a filter screen (752) arranged in the filter barrel (751) and used for filtering oil, the lower end of the filter barrel (751) is connected with an oil return pipeline (753), and one side, far away from the oil return pipeline (753), of the filter screen (752) is provided with an exhaust pipe (754); the position of the air outlet pipeline (74) communicated with the filter barrel (751) is positioned on one side of the filter screen (752) far away from the exhaust pipe (754);

the oil return pipeline (753) is communicated with the oil discharge pipeline (72), and a first control ball valve (755) is arranged on the oil return pipeline (753); a second control ball valve (721) is arranged on the oil liquid discharging pipeline (72), and the second control ball valve (721) is arranged on a pipe section between the connecting point of the oil return pipeline (753) and the oil liquid discharging pipeline (72) and the standing barrel (71);

third heating sheets (76) are respectively arranged in the standing barrel (71) and the filtering barrel (751).

2. The method of dewatering coal tar according to claim 1, characterized by: the heating temperature in step S4 is 180-200 ℃.

3. The method of dewatering coal tar according to claim 1, characterized by: in step S51 and step S52, the mixture is heated continuously, and the temperature is maintained at 200-220 ℃.

4. The method of dewatering coal tar according to claim 1, characterized by: in step S52, the gas is filtered to separate the coal tar and the gas.

5. The method of dewatering coal tar according to claim 1, characterized by: wherein, in the step S2 and the step S3, the mixing ratio of the compressed dry air and the hot steam is 1-3: 1.

6. The method of dewatering coal tar according to claim 1, characterized by: the gas-liquid mixture is heated for 15 to 30 minutes in step S4.

7. The method of dewatering coal tar according to claim 1, characterized by: during the heating process, the coal tar is continuously stirred.