Pressure reducing device for deep processing of coal tar

Abstract

The utility model relates to the technical field of coal tar distillation, and discloses a coal tar deep processing pressure reducing device which comprises a washing oil buffer tank and a bottom plate, a cooler is fixedly connected to the bottom end of the left side of the washing oil buffer tank, and a connecting pipe is fixedly connected to the left side of the top end of the washing oil buffer tank. A tail gas ejector for pumping gas is fixedly connected to the other end of the connecting pipe, a vacuum pump is fixedly connected to the front end of the tail gas ejector, a residual oil ground groove is fixedly connected to the front side of the top end of the bottom plate, a product receiving tank is fixedly connected to the right side of the top end of the bottom plate, and a reduced pressure distillation tower is fixedly connected to the right side of the top end of the bottom plate. According to the utility model, the vacuum pump and the tail gas ejector are connected in series to work, so that the operation performance of the vacuum pump is improved, the stable suction capacity and vacuum are kept, the cavitation condition in the pump is reduced, and the ultimate vacuum of the vacuum pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal tar distillation, in particular to a coal tar deep processing decompression device. Background Art

[0002] The coal tar processing device involves a vacuum distillation system, which is equipped with an oil wash buffer tank, a vacuum pump, and a ground trough. The gas phase components at the top of the coal tar vacuum distillation tower are condensed by a heat exchanger and then enter the product receiving tank. The uncondensed gas at the top of the product receiving tank is sucked by an oil ring vacuum pump to generate a vacuum at the top of the vacuum distillation tower.

[0003] In the prior art, some pressure reducing devices have many problems. For example, the oil ring vacuum pump bears a large compression ratio and needs to have a high circumferential speed so that the vacuum pump can store a large amount of kinetic energy to complete the conversion of pressure energy. This will lead to increased energy consumption of the vacuum pump, severe cavitation of the pump impeller, loud noise from the vacuum pump, and unstable pressure in the vacuum system, which will affect the effect of pressure reduction distillation. Therefore, a coal tar deep processing pressure reducing device is proposed to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a coal tar deep processing decompression device, aiming to improve the problems in the prior art that the oil ring vacuum pump bears a large compression ratio and requires a high circumferential speed, thereby increasing the energy consumption of the vacuum pump.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A coal tar deep processing decompression device, comprising a wash oil buffer tank and a bottom plate, wherein a cooler is fixedly connected to the left bottom end of the wash oil buffer tank, a connecting pipe is fixedly connected to the left top end of the wash oil buffer tank, the other end of the connecting pipe is fixedly connected to an exhaust gas ejector for pumping gas, a vacuum pump is fixedly connected to the front end of the exhaust gas ejector, a residual oil trough is fixedly connected to the front side of the top end of the bottom plate, a product receiving tank is fixedly connected to the right top end of the bottom plate, and a vacuum distillation tower is fixedly connected to the right top end of the bottom plate;

[0007] As a further description of the above technical solution:

[0008] The exhaust gas injector comprises a nozzle, the rear end of the nozzle is fixedly connected to the front end of the exhaust gas injector, the rear end of the nozzle is fixedly connected to a suction chamber, the rear end of the suction chamber is fixedly connected to a mixing chamber, the rear end of the mixing chamber is fixedly connected to a diffuser, the front end of the nozzle is provided with a working gas inlet, the right side of the suction chamber is provided with a guide gas inlet, and the rear end of the diffuser is provided with a mixed gas outlet;

[0009] As a further description of the above technical solution:

[0010] The bottom end of the suction chamber is fixedly connected to the left side of the top end of the bottom plate, and the top end of the mixing chamber is fixedly connected to the left side of the top end of the bottom plate;

[0011] As a further description of the above technical solution:

[0012] The bottom end of the diffuser is fixedly connected to the left side of the top end of the bottom plate, and the bottom end of the vacuum pump is fixedly connected to the left side of the top end of the bottom plate.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, the vacuum pump and the exhaust ejector are connected in series to work, so that the operating performance of the vacuum pump is improved, thereby maintaining a stable suction volume and vacuum, reducing cavitation in the pump, and improving the ultimate vacuum of the vacuum pump.

[0015] 2. In the utility model, the working pressure range of the device is relatively wide, and vacuums of different pressures can be generated by adjusting the valve openings between the various connecting pipes, and the vacuum pressure in the pressure reducing tower can be further adjusted according to actual production.

[0016] 2. In the utility model, the non-condensable gas in the product receiving tank is extracted and mixed with the working gas, and the kinetic energy is converted into pressure energy through the diffusion tube, so that the inlet pressure of the vacuum pump is increased, the energy consumption of the vacuum pump is reduced, and the problems of pump impeller cavitation and high vacuum pump noise are improved, thereby reducing the pump maintenance cost and achieving better environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional schematic diagram of a coal tar deep processing pressure reducing device proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a cooler for a coal tar deep processing pressure reducing device proposed by the utility model;

[0019] Figure 3 This is a structural schematic diagram of a suction chamber of a coal tar deep processing decompression device proposed by the utility model;

[0020] Figure 4 The utility model discloses a structural schematic diagram of a residual oil trough of a coal tar deep processing pressure reducing device.

[0021] Legend:

[0022] 1. Wash oil buffer tank; 2. Cooler; 3. Exhaust gas ejector; 4. Nozzle; 5. Mixing chamber; 6. Diffuser; 7. Suction chamber; 8. Working gas inlet; 9. Inlet gas inlet; 10. Mixed gas outlet; 11. Vacuum pump; 12. Residual oil trough; 13. Product receiving tank; 14. Vacuum distillation tower. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Reference Figure 1-Figure 3The utility model provides an embodiment: a coal tar deep processing decompression device, comprising a wash oil buffer tank (1) and a bottom plate, the left bottom end of the wash oil buffer tank (1) is fixedly connected with a cooler (2), the cooler 2 in the wash oil buffer tank 1 here is a shell and tube water cooling, used to reduce the wash oil temperature in the buffer tank, so that the wash oil can better absorb dissolved gas phase components, the top left side of the wash oil buffer tank (1) is fixedly connected with a connecting pipe, the other end of the connecting pipe is fixedly connected with an exhaust gas injector (3) for pumping gas, the exhaust gas injector (3) includes a nozzle (4), the exhaust gas injector 3 here generates a high speed through the nozzle 4 so that a negative pressure is generated behind the nozzle 4, and the rear end of the nozzle (4) is fixedly connected to the exhaust gas nozzle The front end of the ejector (3) and the rear end of the nozzle (4) are fixedly connected with an intake chamber (7), wherein the intake chamber 7 is used to inhale non-condensable gas, the bottom end of the intake chamber (7) is fixedly connected to the left side of the top end of the bottom plate, the rear end of the intake chamber (7) is fixedly connected with a mixing chamber (5), wherein the mixing chamber 5 can extract non-condensable gas and mix it with the working gas in the working gas inlet 8, the top end of the mixing chamber (5) is fixedly connected to the left side of the top end of the bottom plate, the rear end of the mixing chamber (5) is fixedly connected with a diffuser (6), the bottom end of the diffuser (6) is fixedly connected to the left side of the top end of the bottom plate, and the bottom plate here plays a supporting and fixing role for the diffuser 6, the front end of the nozzle (4) is provided with a working gas inlet (8), and the intake chamber (5) is provided with a mixing chamber (5). A gas inlet (9) is provided on the right side of the inlet chamber (7), a mixed gas outlet (10) is provided at the rear end of the diffuser (6), a vacuum pump (11) is fixedly connected to the front end of the tail gas ejector (3), the air intake port of the vacuum pump 11 is connected in series with the tail gas ejector 3, the air exhaust port is connected to the upper gas phase space of the oil washing buffer tank 1, the bottom end of the vacuum pump (11) is fixedly connected to the left side of the top end of the bottom plate, the front side of the top end of the bottom plate is fixedly connected to the residual oil trough (12), the oil washing buffer tank 1 has an overflow port, the overflow port is connected to the residual oil trough 12, the right side of the top end of the bottom plate is fixedly connected to the product receiving tank (13), the side port of the tail gas ejector 3 is connected to the product receiving tank 13, and the product receiving tank 13 is connected to the product receiving tank 13. The non-condensable gas in the collecting tank 13 is extracted and mixed with the working gas, and the kinetic energy is converted into pressure energy through the diffusion tube, so that the inlet pressure of the vacuum pump 11 is increased, so that the working range of the vacuum pump 11 is moved to the stable performance section, the stable suction volume and vacuum are maintained, the cavitation in the pump is reduced, and the ultimate vacuum of the vacuum pump 11 is improved. The vacuum pump 11 here is a liquid ring type, and the liquid medium is wash oil. The wash oil in the pump is supplied from the wash oil buffer tank 1 through a pipeline. The wash oil forms a rotating liquid ring under the action of the centrifugal force generated by the rotation of the impeller. The rotating liquid ring is the power source for the pump to achieve suction and exhaust. A vacuum distillation tower (14) is fixedly connected to the right side of the top of the bottom plate. The bottom plate here plays a supporting and fixing role for the vacuum distillation tower 14.

[0025] Working principle: In the coal tar deep processing decompression device, various components work together to achieve an efficient decompression distillation process. First, the wash oil stored in the wash oil buffer tank 1 is cooled with the help of the shell and tube water cooler 2 to enhance its ability to absorb gaseous components. The overflow port of the wash oil buffer tank 1 controls the pressure and flow, maintains the processing efficiency and product quality, and discharges the excess residual oil to the residual oil tank 12. At the same time, the exhaust gas ejector 3 uses the non-condensable exhaust gas in the wash oil buffer tank 1 as the working gas, generates a high-speed airflow through the nozzle 4, forms a negative pressure zone, extracts the non-condensable gas in the product receiving tank 13 and mixes it with the gas input from the working gas inlet 8 in the mixing chamber 5.

[0026] The mixed gas enters the diffuser 6, and the kinetic energy is converted into pressure energy, which increases the pressure at the inlet of the vacuum pump 11, stabilizes the suction volume and vacuum degree, and reduces cavitation in the pump. The liquid ring vacuum pump 11 forms a rotating liquid ring through the wash oil supplied by the wash oil buffer tank 1, thereby realizing continuous suction and exhaust functions. The gas inlet 9 may introduce gas components in the external gas regulation system. Finally, the mixed gas leaves through the mixed gas outlet 10, and the vacuum distillation tower 14 operates independently during this process to effectively separate and treat the coal tar. Through this series of fine process controls, the coal tar deep processing decompression device not only ensures the processing efficiency, but also ensures the quality of the final product.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal tar deep processing decompression device, comprising a wash oil buffer tank (1) and a bottom plate, characterized in that: The left bottom end of the wash oil buffer tank (1) is fixedly connected to a cooler (2), the left top end of the wash oil buffer tank (1) is fixedly connected to a connecting pipe, the other end of the connecting pipe is fixedly connected to an exhaust gas ejector (3) for pumping gas, the front end of the exhaust gas ejector (3) is fixedly connected to a vacuum pump (11), the front side of the top end of the bottom plate is fixedly connected to a residual oil trough (12), the right top end of the bottom plate is fixedly connected to a product receiving tank (13), and the right top end of the bottom plate is fixedly connected to a vacuum distillation tower (14).

2. A coal tar deep processing decompression device according to claim 1, characterized in that: The exhaust gas injector (3) comprises a nozzle (4), the rear end of the nozzle (4) is fixedly connected to the front end of the exhaust gas injector (3), the rear end of the nozzle (4) is fixedly connected to a suction chamber (7), the rear end of the suction chamber (7) is fixedly connected to a mixing chamber (5), the rear end of the mixing chamber (5) is fixedly connected to a diffuser (6), the front end of the nozzle (4) is provided with a working gas inlet (8), the right side of the suction chamber (7) is provided with a guide gas inlet (9), and the rear end of the diffuser (6) is provided with a mixed gas outlet (10).

3. A coal tar deep processing decompression device according to claim 2, characterized in that: The bottom end of the suction chamber (7) is fixedly connected to the left side of the top end of the bottom plate, and the top end of the mixing chamber (5) is fixedly connected to the left side of the top end of the bottom plate.

4. A coal tar deep processing decompression device according to claim 2, characterized in that: The bottom end of the diffuser (6) is fixedly connected to the left side of the top end of the bottom plate, and the bottom end of the vacuum pump (11) is fixedly connected to the left side of the top end of the bottom plate.

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