System for cooling and separating oil and water on top of tar dehydrating tower

Abstract

The utility model relates to a system for cooling and separating oil and water at the top of a tar dehydrating tower. The system comprises a condensing, cooling and separating integrated tower, a separated water delivery pump and a light oil reflux pump, a condensing and cooling section, an oil-water separation section, a light oil intermediate tank and a separated water intermediate tank are sequentially arranged in the tower body of the condensing, cooling and separating integrated tower from top to bottom. The condensing device, the cooling device, the oil-water separation device, the light oil intermediate tank, the separated water intermediate tank and other equipment are integrated in one tower body, so that the occupied area is greatly reduced, the cost is reduced, the equipment layout and operation are more convenient, and the oil-water separation effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of coking, in particular to a system for cooling and separating oil and water at the top of a tar dehydration tower. Background Art

[0002] At present, there are three common treatment methods for the final dehydration of coal tar distillation in the coking industry:

[0003] The first method is that the raw tar is initially dehydrated in the oil depot (static separation alone or centrifugal separation using a super centrifuge), and the tar after the initial dehydration is sent to an intermittent kettle for final dehydration. The intermittent kettle is heated with steam or heat transfer oil, and the tar after the final dehydration is sent to a tar fraction tower for distillation, which is mainly used for intermittent tar processing;

[0004] The second type is that the raw tar is initially dehydrated in the oil depot (separate static separation or centrifugal separation by super centrifuge), and the tar after the initial dehydration is sent to the convection section of the tubular furnace for heating to complete the final dehydration. The tar after the final dehydration is sent to the tar fraction tower for distillation, which is mainly used for small-scale continuous tar processing;

[0005] The third type is that the raw tar is initially dehydrated in the oil depot (static separation alone or centrifugal separation using a super centrifuge), the tar after initial dehydration is heat exchanged in a tar preheater (using steam or heat transfer oil as a heat source), the heated tar is successively sent to a pre-dehydration tower and a dehydration tower to complete the final dehydration, and the final dehydrated tar is sent to a tar fractionation tower for distillation, which is mainly used for medium and large-scale continuous tar processing.

[0006] In the coking industry, since the construction scale is basically medium or large, the third final dehydration method mentioned above is widely used. Common dehydration tower top oil-water condensation cooling systems are as follows: Figure 1 As shown, the oil and gas at the top of the dehydration tower 1-1 first enter the air cooler 1-2 for condensation, and then enter the cooler 1-3 for heat exchange and cooling with circulating water. The cooled oil-water mixture flows by gravity to the oil-water separator 1-4, where it is statically separated. Since the density of light oil is less than that of water, the light oil flows into the light oil chamber of the oil-water separator 1-4 through the partition at the upper layer, and the water at the lower layer is sent out. The light oil in the oil-water separator 1-4 flows by gravity into the reflux tank 1-5, and then is pumped out by the reflux pump 1-6. A part of the light oil is pumped into the top of the dehydration tower 1-1 as reflux, and the other part of the light oil is sent out.

[0007] In the above process flow, materials flow from air cooler 1-2 to cooler 1-3, from cooler 1-3 to oil-water separator 1-4, and from oil-water separator 1-4 to reflux tank 1-5 into the next-level equipment by gravity. Therefore, these devices need to be arranged on civil engineering frames of different heights. Not only do multiple civil engineering frames of different heights need to be set up, but they also occupy a large area, and the final oil-water separation effect is not particularly ideal. Summary of the invention

[0008] The utility model provides a system for cooling and separating oil and water at the top of a tar dehydration tower, which integrates a condensing device, a cooling device, an oil-water separation device, a light oil intermediate tank, a separation water intermediate tank and other equipment into one tower body, greatly reducing the floor space and cost, making equipment layout and operation more convenient and achieving better oil-water separation effect.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A system for cooling and separating oil and water at the top of a tar dehydration tower, comprising a condensation cooling separation integrated tower, a separation water delivery pump and a light oil reflux pump; a condensation cooling section, an oil-water separation section, a light oil intermediate tank and a separation water intermediate tank are sequentially arranged in the tower body of the condensation cooling separation integrated tower from top to bottom; the condensation cooling section is provided with a condensation cooler, an oil-gas mixture inlet is arranged on one side of the upper part of the condensation cooling section to connect to the oil-gas mixture outlet at the top of the dehydration tower, and an oil-water mixture outlet is arranged on one side of the lower part of the condensation cooling section; a feed distributor is arranged in the tower body in the middle of the oil-water separation section, and the oil-water mixture outlet of the condensation cooling section is connected to the feed distributor through an external oil-water mixture pipeline The distributor has an oil-water mixture inlet, and the feed distributor has multiple feed holes evenly distributed along the cross-section of the tower body; a light oil outlet is arranged on one side of the upper part of the oil-water separation section, which is connected to the light oil inlet on one side of the light oil intermediate tank through an external light oil pipeline; a light oil outlet is arranged at the bottom of the light oil intermediate tank, which is connected to the reflux light oil inlet on one side of the upper part of the dehydration tower through a light oil reflux pipeline, and a light oil reflux pump is arranged on the light oil reflux pipeline; a separation water outlet is arranged on one side of the lower part of the oil-water separation section, which is connected to the separation water inlet on one side of the separation water intermediate tank through an external separation water pipeline; a separation water outlet is arranged at the bottom of the separation water intermediate tank, which is connected to the external external separation water pipeline, and a separation water delivery pump is arranged on the external separation water pipeline.

[0011] Furthermore, the condenser cooler is a shell and tube heat exchanger, the oil-gas mixture inlet is the shell inlet, and the oil-water mixture outlet is the shell outlet; the top of the condenser cooler is provided with a tube side inlet and a tube side outlet, and the tube side inlet and the tube side outlet are respectively connected to the circulating water system; a safety valve is provided on the circulating water pipeline connected to the tube side outlet.

[0012] Furthermore, the oil-water mixture outlet of the condensation cooling section is connected to the oil-water mixture pipeline through a plurality of outlet pipelines at different heights; each outlet pipeline is provided with a valve group and a sight glass.

[0013] Furthermore, the condensation cooling section is provided with a liquid level meter.

[0014] Furthermore, a liquid level regulator and an interface meter are provided outside the oil-water separation section.

[0015] Furthermore, the feed distributor is composed of a spirally wound multi-turn pipe, the pipe is provided with feed holes at even intervals, and on the same cross section, the upper and lower parts of the pipe are each distributed with two holes with a diameter of Feed hole.

[0016] Furthermore, a vented gas outlet is provided on one side of the upper portion of the oil-water separation section, the top of the light oil intermediate tank, and the top of the separated water intermediate tank, respectively, and is connected to a vented gas treatment system via a vented gas pipeline.

[0017] Furthermore, an anti-vortex component is provided at the light oil outlet at the bottom of the light oil intermediate tank.

[0018] Furthermore, an anti-vortex component is provided at the separation water outlet at the bottom of the separation water intermediate tank.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1) Integrate multiple devices such as condensing device, cooling device, oil-water separation device, light oil intermediate tank, separated water intermediate tank into one tower body, reducing the number of dispersed equipment and greatly reducing the floor space;

[0021] 2) Oil-water mixture, light oil and separated water can flow into the next level of equipment by gravity, which reduces the construction of civil framework and reduces costs;

[0022] 3) The integrated condensation, cooling and separation tower can be arranged close to the dehydration tower, making the equipment layout more reasonable and the operation more convenient;

[0023] 4) Multiple outlet pipes with different heights are set at the outlet of the oil-water mixture of the condensation cooling section. The effective cooling area of ​​the condensation cooler is ensured by opening valve groups at different heights. The liquid height in the condensation cooler is monitored at any time by a liquid level meter, which can also well ensure the condensation cooling area. By reasonably allocating the condensation cooling area, the condensation cooling can be completed in one device at one time.

[0024] 5) The oil-water separation section is equipped with a feed distributor to effectively reduce feed disturbance and enhance the oil-water separation effect; according to the density difference between light oil and water, the interface of the oil-water mixture is adjusted with a liquid level regulator to further improve the oil-water separation effect; by adjusting the oil-water interface in the oil-water separation section and reasonably distributing the feed liquid through the feed distributor, the oil-water separation effect is controlled in a dual-effect manner, making the oil-water separation effect better;

[0025] 6) The outer wall of the oil-water separation equipment of the condensation cooling separation integrated equipment is equipped with a liquid level regulator, and the distributor plus the liquid level regulator are dual-effect control, which has a better separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a structural schematic diagram of the traditional dehydration tower top oil-water condensation cooling system.

[0027] Figure 1 Middle: 1-1. Dehydration tower 1-2. Air cooler 1-3. Cooler 1-4. Oil-water separator 1-5. Reflux tank 1-6. Reflux pump

[0028] Figure 2 The utility model is a structural schematic diagram of a system for cooling and separating oil and water at the top of a tar dehydration tower.

[0029] Figure 3 It is a structural schematic diagram of the distributor of the utility model.

[0030] Figure 4 It is a schematic diagram of the cross-section opening of the distributor described in the utility model.

[0031] Figure 2-Figure 4 Middle: 1. Dehydration tower 2. Condensation cooling separation integrated tower 3. Condensation cooling section 3-1. Liquid level meter 3-2. Valve group 3-3. Sight glass 3-4. Safety valve 4. Oil-water separation section 4-1. Feed distributor 4-1-1. Feed hole 4-2. Interface meter 4-3. Conduit 5. Light oil intermediate tank 5-1. Anti-eddy current part 6. Separation water intermediate tank 6-1. Anti-eddy current part 7. Liquid level regulator 7-1. Hand wheel 8. Light oil reflux pump 9. Separation water delivery pump DETAILED DESCRIPTION

[0032] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0033] like Figure 2As shown, the utility model discloses a system for cooling and separating oil and water at the top of a tar dehydration tower, comprising a condensation cooling separation integrated tower 2, a separation water delivery pump 9 and a light oil reflux pump 8; the tower body of the condensation cooling separation integrated tower 2 is provided with a condensation cooling section 3, an oil-water separation section 4, a light oil intermediate tank 5 and a separation water intermediate tank 6 in sequence from top to bottom; the condensation cooling section 3 is provided with a condenser cooler, an oil-gas mixture inlet is provided on one side of the upper part of the condensation cooling section 3 to connect to the oil-gas mixture outlet at the top of the dehydration tower 1, and an oil-water mixture outlet is provided on one side of the lower part of the condensation cooling section 3; a feed distributor 4-1 is provided in the tower body in the middle of the oil-water separation section 4, and the oil-water mixture outlet of the condensation cooling section 3 passes through the external oil-water mixture A pipeline is connected to the oil-water mixture inlet of the feed distributor 4-1, and the feed distributor 4-1 has multiple feed holes evenly distributed along the cross-section of the tower body; a light oil outlet is set on the upper side of the oil-water separation section 4, which is connected to the light oil inlet on one side of the light oil intermediate tank 5 through an external light oil pipeline; a light oil outlet is set at the bottom of the light oil intermediate tank 5, which is connected to the reflux light oil inlet on one side of the upper part of the dehydration tower 1 through a light oil reflux pipeline, and a light oil reflux pump 8 is set on the light oil reflux pipeline; a separation water outlet is set on the lower side of the oil-water separation section 4, which is connected to the separation water inlet on one side of the separation water intermediate tank 6 through an external separation water pipeline; a separation water outlet is set at the bottom of the separation water intermediate tank 6 to connect to the external external separation water pipeline, and a separation water delivery pump 9 is set on the external separation water pipeline.

[0034] Furthermore, the condenser cooler is a shell and tube heat exchanger, the oil-gas mixture inlet is the shell side inlet, and the oil-water mixture outlet is the shell side outlet; the top of the condenser cooler is provided with a tube side inlet and a tube side outlet, and the tube side inlet and the tube side outlet are respectively connected to the circulating water system; a safety valve 3-4 is provided on the circulating water pipeline connected to the tube side outlet.

[0035] Furthermore, the oil-water mixture outlet of the condensation cooling section 3 is connected to the oil-water mixture pipeline through a plurality of outlet pipelines at different heights; each outlet pipeline is provided with a valve group 3-2 and a sight glass 3-3.

[0036] Furthermore, the condensation cooling section 3 is provided with a liquid level meter 3 - 1 .

[0037] Furthermore, a liquid level regulator 7 and an interface meter 4 - 2 are provided outside the oil-water separation section 4 .

[0038] Further, such as Figure 3 , Figure 4 As shown, the feed distributor 4-1 is composed of a spirally wound multi-turn pipe, and the pipe is provided with feed holes 4-1-1 at even intervals, and on the same cross section, the upper and lower parts of the pipe are each distributed with two holes with a diameter of The feed hole is 4-1-1.

[0039] Furthermore, the upper side of the oil-water separation section 4, the top of the light oil intermediate tank 5, and the top of the separated water intermediate tank 6 are respectively provided with vented gas outlets, which are connected to the vented gas treatment system through vented gas pipelines.

[0040] Furthermore, an anti-vortex component 5 - 1 is provided at the light oil outlet at the bottom of the light oil intermediate tank 5 .

[0041] Furthermore, an anti-vortex component 6 - 1 is provided at the separation water outlet at the bottom of the separation water intermediate tank 6 .

[0042] The process of the oil-water cooling and separation system for the top of a tar dehydration tower described in the utility model is as follows:

[0043] 1) The oil-gas mixture at 90-110°C coming out of the top of the dehydration tower 1 enters the condensation cooling separation integrated tower 2 through the oil-gas mixture pipeline, is first condensed and cooled to an oil-water mixture below 40°C by cooling water in the condensation cooling section 3, and then flows into the oil-water separation section 4 through the oil-water mixture pipeline; the cooling speed of the condenser cooler is adjusted by opening the valve group 3-2 on the outlet pipeline at different heights, the flow state of the oil-water mixture is observed through the sight glass 3-3, and the liquid level in the condenser cooler is monitored by the liquid level meter 3-1;

[0044] 2) After the oil-water mixture flows into the oil-water separation section 4 by gravity, the feed distributor 4-1 and the liquid level regulator 7 cooperate to complete the oil-water separation; the oil-water mixture enters the middle part of the oil-water separation section 4 through the multiple feed holes 4-1-1 on the feed distributor 4-41; the liquid level in the oil-water separation section 4 is adjusted by the liquid level regulator 7, and the height of the oil-water interface is adjusted at the same time, and the oil-water interface height is monitored by the interface meter 4-2; the separated light oil flows by gravity into the light oil intermediate tank 5 through the light oil pipeline, and the separated separation water flows by gravity into the separation water intermediate tank 6 through the separation water pipeline;

[0045] 3) The light oil at the bottom of the light oil intermediate tank 5 is pumped out by the light oil reflux pump 8, part of which is sent to the dehydration tower 1 for reflux, and the other part is sent out;

[0046] 4) The separation water at the bottom of the separation water intermediate tank 6 is pumped out by the separation water delivery pump 9 and delivered to the outside;

[0047] 5) The vented gas from the oil-water separation section 4, the light oil intermediate tank 5, and the separated water intermediate tank 6 is collected uniformly and sent to the vented gas treatment system.

[0048] The utility model discloses a system and method for cooling and separating oil and water at the top of a tar dehydration tower, wherein the system is mainly composed of a condensation cooling separation integrated tower 2, a separation water delivery pump 9, and a light oil reflux pump 8. The condensation cooling separation integrated tower 2 is composed of a condensation cooling section 3, an oil-water separation section 4, a light oil intermediate tank 5, a separation water intermediate tank 6, and the like.

[0049] The oil-gas mixture coming out from the top of the dehydration tower 1 is separated from the oil and water after being condensed, cooled and separated by the integrated tower 2. The separated light oil is stored in the light oil intermediate tank 5 and pumped out by the light oil reflux pump 8, with one part sent to the dehydration tower 1 for reflux and the other part sent out; the separated water is stored in the separation water intermediate tank 6 and pumped out by the separation water delivery pump 9 for sending out.

[0050] The condensation and cooling of the oil-gas mixture is realized in the condensation and cooling section 3. The oil-gas mixture at about 100°C coming out from the top of the dehydration tower 1 enters the condensation and cooling section 3, in which a condensation cooler is arranged. Taking a shell and tube cooler as an example, the oil-gas mixture enters the shell side and is condensed and cooled to below 40°C by circulating cooling water to form an oil-water mixture. The oil-water mixture flows into the oil-water separation section 4 by gravity through the oil-water mixture pipeline (on which a valve group 3-2 and a sight glass 3-3 are arranged).

[0051] In order to ensure the effective cooling area of ​​the condensation cooling section 3, the valve group 3-2 on the outlet pipe at different heights can be opened for adjustment. A sight glass is provided at the outlet of the valve group 3-2 to observe the flow state of the liquid. At the same time, a liquid level gauge 3-1 is provided on the shell side of the shell and tube cooler to monitor the liquid height in the condensation cooling section 3 at any time, which can also well ensure the condensation cooling area, so that the condensation cooling area is well distributed and the condensation cooling is completed in one device at one time.

[0052] The cooled oil-water mixture flows into the oil-water separation section 4 by gravity for oil-water separation. The oil-water separation is mainly completed by the cooperation of the feed distributor 4.1 and the liquid level regulator 7. The cooled oil-water mixture enters the middle of the oil-water separation section 4 and is evenly distributed in the cross section of the oil-water separation section 4 by the feed distributor 4-1. The structure of the feed distributor is as follows: Figure 3 , 4 As shown, feed holes are evenly opened along the circumference on multiple turns of pipes with different diameters of the feed distributor 4-1, preferably two feed holes are opened at the upper and lower parts of the same cross section of the pipe (with an angle of 90° apart). The distribution of the feed distributor fundamentally reduces the disturbance of the liquid during feeding, thereby achieving efficient oil-water separation.

[0053] A liquid level regulator 7 is provided on the outside of the oil-water separation section 4. The bottom of the liquid level regulator 7 is connected to the water phase at the bottom of the oil-water separation section 4 through a conduit 4-3. The inner cylinder provided or raised and lowered in the liquid level regulator 7 can adjust the liquid level by adjusting the height of the inner cylinder through a hand wheel 7-1, and can also adjust the height of the oil-water interface in the oil-water separation section 4. The height of the oil-water interface in the oil-water separation section 4 is detected by an interface meter 4-2. By adjusting the oil-water interface in the oil-water separation section 4 and by reasonably distributing the influent through the feed distributor 4-1, the oil-water separation effect is controlled in a dual-effect manner, so that the oil-water separation effect is better. The separated water flows into the separation water intermediate tank 6 from the bottom of the oil-water separation section 4 by gravity; the separated light oil flows into the light oil intermediate tank 5 from the upper part of the oil-water separation section 4 by gravity, thereby completing the oil-water separation process.

[0054] After the light oil separated from the oil-water separation section 4 flows into the light oil intermediate tank 5, it is pumped out at the bottom of the light oil intermediate tank 5 by the light oil reflux pump 8, part of which is sent to the dehydration tower 1 for reflux, and the other part is sent out. In order to prevent the bottom liquid level from swirling, an anti-vortex part 5-1 is provided at the light oil outlet at the bottom of the light oil intermediate tank 5.

[0055] The water separated from the oil-water separation section 4 flows into the separation water intermediate tank 6, and is pumped out and sent out by the separation water delivery pump 9 at the bottom of the separation water intermediate tank 6. In order to prevent the bottom liquid level from swirling, an anti-vortex part 6-1 is provided at the separation water outlet at the bottom of the separation water intermediate tank 6.

[0056] The vented gases from the oil-water separation section 4, the light oil intermediate tank 5, and the separated water intermediate tank 6 are collected together and sent to the vented gas treatment system.

[0057] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for cooling and separating oil and water at the top of a tar dehydration tower, characterized in that: It comprises a condensation cooling separation integrated tower, a separation water delivery pump and a light oil reflux pump; the tower body of the condensation cooling separation integrated tower is provided with a condensation cooling section, an oil-water separation section, a light oil intermediate tank and a separation water intermediate tank in order from top to bottom; the condensation cooling section is provided with a condenser cooler, an oil-gas mixture inlet is provided on one side of the upper part of the condensation cooling section to connect to the oil-gas mixture outlet at the top of the dehydration tower, and an oil-water mixture outlet is provided on one side of the lower part of the condensation cooling section; a feed distributor is provided in the tower body in the middle of the oil-water separation section, the oil-water mixture outlet of the condensation cooling section is connected to the oil-water mixture inlet of the feed distributor through an external oil-water mixture pipeline, and the feed distributor has multiple feed holes evenly distributed along the cross section of the tower body; a light oil outlet is provided on one side of the upper part of the oil-water separation section to connect to the light oil inlet on one side of the light oil intermediate tank through an external light oil pipeline; a light oil outlet is provided at the bottom of the light oil intermediate tank to connect to the reflux light oil inlet on one side of the upper part of the dehydration tower through a light oil reflux pipeline, and a light oil reflux pump is provided on the light oil reflux pipeline; A separation water outlet is provided on one side of the lower part of the oil-water separation section, which is connected to a separation water inlet on one side of the separation water intermediate tank through an external separation water pipeline; a separation water outlet is provided at the bottom of the separation water intermediate tank to connect to an external external separation water delivery pipeline, and a separation water delivery pump is provided on the external separation water delivery pipeline.

2. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: The condenser cooler is a shell and tube heat exchanger, the oil-gas mixture inlet is the shell side inlet, and the oil-water mixture outlet is the shell side outlet; the top of the condenser cooler is provided with a tube side inlet and a tube side outlet, and the tube side inlet and the tube side outlet are respectively connected to the circulating water system; a safety valve is provided on the circulating water pipeline connected to the tube side outlet.

3. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: The oil-water mixture outlet of the condensation cooling section is connected to the oil-water mixture pipeline through a plurality of outlet pipelines at different heights; each outlet pipeline is provided with a valve group and a sight glass.

4. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: The condensation cooling section is provided with a liquid level meter.

5. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: A liquid level regulator and an interface meter are arranged outside the oil-water separation section.

6. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: The feed distributor is composed of a spirally wound multi-turn pipe, on which feed holes are evenly spaced, and on the same cross section, two holes with a diameter of Feed hole.

7. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: The upper side of the oil-water separation section, the top of the light oil intermediate tank, and the top of the separated water intermediate tank are respectively provided with vented gas outlets, which are connected to the vented gas treatment system through vented gas pipelines.

8. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: An anti-vortex component is provided at the light oil outlet at the bottom of the light oil intermediate tank.

9. A system for cooling and separating oil and water at the top of a tar dehydration tower according to claim 1, characterized in that: An anti-vortex component is provided at the separation water outlet at the bottom of the separation water intermediate tank.

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