Crude benzene distillation and wash oil regeneration heating system
By introducing heat exchangers and slag storage tanks to preheat light oil in the negative pressure crude benzene distillation system in the coking industry, and heating regenerated oil vapor with the inner and outer sides of the spiral tube and jacket, the problems of high energy consumption and heat waste in the existing technology are solved, efficient heat utilization and oil vapor heating are achieved, and debenzene removal efficiency is improved.
Patent Information
- Application Number
- CN202422726910.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-11-08
AI Technical Summary
In the existing negative pressure crude benzene distillation process in the coking industry, the superheated steam heating method consumes a lot of energy, the split heating method increases the difficulty of handling and is seriously wasted heat, and the residue and waste heat of the oil and gas are not used during the oil washing and regeneration process.
A system including a benzene washing tower, a benzene debenzene tower, a regenerator and a heater is designed to preheat light oil through a heat exchanger and a slag storage tank, regenerated oil and gas are heated using a spiral tube and the inner and outer sides of the jacket, and filter impurities are filtered together with an agitator and a filter to achieve efficient heat utilization and uniform heating of oil and gas.
It achieves good energy saving effect, simple operation, less heat waste, improves heating efficiency, ensures the vaporization effect of recycled oil vapor, reduces energy consumption and improves the debenzene efficiency.
Smart Images
Figure CN223170339U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coking equipment, in particular to a crude benzene distillation and wash oil regeneration heating system. Background Technique
[0002] The negative pressure crude benzene distillation process method in the coking industry has the characteristics of high benzene removal efficiency, energy saving, water saving, etc., and has been widely used. At present, there are three methods for regenerating wash oil in the negative pressure crude benzene distillation process: direct heating method with superheated steam (300°C - 400°C), two-way heating method for the circulating wash oil in the debenzolization tower and the regenerated circulating wash oil, and different vacuum regeneration methods for heating the debenzolization circulating wash oil and the regenerated circulating wash oil together. However, it is found in the actual operation process that there are some problems with these three methods: First, the use of the superheated steam heating method requires a large amount of superheated steam, and the energy saving and water saving effects are not good; second, the use of the two-way heating method for the debenzolization circulating wash oil and the regenerated circulating wash oil requires two heaters or one heater to accurately heat two different temperature media, which will undoubtedly increase the operation difficulty and investment cost; in addition, residues and oil vapor will be generated during the wash oil regeneration process, and a large amount of waste heat is contained in these residues and oil vapor. If not utilized, it will cause waste of heat. Therefore, it is objectively necessary to develop a crude benzene distillation and wash oil regeneration heating system with good energy saving effect, simple operation and less heat waste. Content of the Utility Model
[0003] The purpose of the utility model is to provide a crude benzene distillation and wash oil regeneration heating system with good energy saving effect, simple operation and less heat waste.
[0004] The purpose of the utility model is realized as follows. It includes a benzene scrubber, a debenzolization tower, a regenerator and a heater, and also includes a heat exchanger and a slag storage tank. The heavy oil outlet at the bottom of the benzene scrubber is connected to the heavy oil inlet at the upper part of the debenzolization tower through a pipeline. The light oil inlet at the upper part of the benzene scrubber is connected to the light oil outlet at the bottom of the debenzolization tower through a pipeline. The top outlet of the debenzolization tower is connected to the tube side inlet of the heat exchanger through a pipeline. Heat exchange tubes are arranged in the slag storage tank. The light oil outlet at the bottom of the debenzolization tower is connected to the shell side inlet of the heat exchanger and the inlet end of the heat exchange tubes respectively through pipelines. The shell side outlet of the heat exchanger and the outlet end of the heat exchange tubes are connected to the inlet of the heater through pipelines. A jacket is arranged on the outer wall of the regenerator. A spiral tube is arranged inside the regenerator. The upper port of the spiral tube is connected to the jacket, and the lower port is connected to the outlet of the heater. The lower part of the jacket is connected to the lower part of the debenzolization tower through a pipeline. The lower part of the regenerator is connected to the outlet of the heater through a pipeline, and the top is connected to the lower part of the debenzolization tower through a pipeline.
[0005] Further, a stirrer is arranged inside the regenerator, and the stirring blades of the stirrer are located inside the spiral tube.
[0006] Further, a filter screen is arranged inside the regenerator above the spiral tube.
[0007] Further, a spray head is arranged above the filter screen. The inlet end of the spray head is communicated with the air outlet of the top of the regenerator through a backwash pipe, and a backwash air pump is arranged on the backwash pipe.
[0008] Further, a mixer is arranged on the pipeline at the inlet end of the heater. The shell-side outlet of the heat exchanger and the outlet end of the heat exchange tube are both communicated with the inlet of the mixer.
[0009] Further, heat preservation layers are arranged on the outer walls of the heat exchanger and the slag storage tank.
[0010] When the utility model operates, the heavy oil discharged from the benzol scrubber is conveyed to the debenzolizer. The light oil after debenzolization is divided into three streams. The first stream is conveyed to the benzol scrubber for benzene scrubbing. The second stream is conveyed to the shell side of the heat exchanger and preheated by using the heat in the hot steam discharged from the debenzolizer. The third stream is conveyed to the heat exchange tubes in the slag storage tank and preheated by using the heat in the oil slag, so as to improve the heating efficiency of the subsequent heater, reduce the energy consumption of the heater, save energy. The two streams of light oil preheated by the heat exchanger and the slag storage tank converge and flow into the heater. The temperature of the light oil is increased by using the heater. After heating is completed, the light oil is divided into two streams and sent into the regenerator. One stream flows through the spiral tube and the jacket in sequence and then is sent into the debenzolizer. The other stream is sent into the interior of the regenerator, and the light oil in the spiral tube and the jacket provides heat for it from both the inside and the outside simultaneously, preventing the temperature of the regenerated oil vapor from decreasing and ensuring a good vaporization and regeneration effect of the regenerated oil vapor. The regenerated oil vapor is sent into the debenzolizer from the top of the regenerator. In the above process, the debenzolization of the wash oil is carried out in the debenzolizer, and the wash oil in the debenzolizer is flash-vaporized by using the heat contained in the regenerated oil vapor and the circulating oil vapor conveyed from the regenerator, so as to achieve the purpose of debenzolization. The utility model has good energy-saving effect, simple operation and less heat waste, and has remarkable economic value and social value. Description of the Drawings
[0011] Figure 1 is the overall structural schematic diagram of the utility model;
[0012] In the figure: 1 - benzol scrubber, 2 - debenzolizer, 3 - regenerator, 4 - heater, 5 - heat exchanger, 6 - slag storage tank, 7 - heat exchange tube, 8 - jacket, 9 - spiral tube, 10 - stirrer, 11 - filter screen, 12 - spray head, 13 - backwash pipe, 14 - mixer. Detailed Embodiment
[0013] The following further describes the present utility model with reference to the drawings, but does not limit the present utility model in any way. Any change or improvement based on the present utility model falls within the protection scope of the present utility model.
[0014] Such as Figure 1As shown in the figure, the utility model includes a benzol scrubber 1, a debenzolizer 2, a regenerator 3 and a heater 4. The benzol scrubber 1 is an existing device, which is used for scrubbing benzol from crude benzene and generating heavy oil. The debenzolizer 2 is used for debenzolizing the heavy oil and generating light oil. The regenerator 3 is used for regenerating the wash oil to realize the recycling of the wash oil. The heater 4 provides heat for heating the wash oil. It also includes a heat exchanger 5 and a slag storage tank 6. The heavy oil outlet at the bottom of the benzol scrubber 1 is connected to the heavy oil inlet at the upper part of the debenzolizer 2 through a pipeline. The light oil inlet at the upper part of the benzol scrubber 1 is connected to the light oil outlet at the bottom of the debenzolizer 2 through a pipeline. The top outlet of the debenzolizer 2 is connected to the tube-side inlet of the heat exchanger 5 through a pipeline. There are heat exchange tubes 7 arranged in the slag storage tank 6. The heat exchange tubes 7 can use structures such as tube bundles, elbow pipes, spiral coil pipes, etc., as long as they have a good heat exchange effect. The light oil outlet at the bottom of the debenzolizer 2 is connected to the shell-side inlet of the heat exchanger 5 and the inlet end of the heat exchange tubes 7 through pipelines respectively. The shell-side outlet of the heat exchanger 5 and the outlet end of the heat exchange tubes 7 are connected to the inlet of the heater 4 through pipelines. There is a jacket 8 arranged on the outer wall of the regenerator 3, and a spiral tube 9 is arranged inside the regenerator 3. The upper port of the spiral tube 9 is connected to the jacket 8, and the lower port is connected to the outlet of the heater 4. The lower part of the jacket 8 is connected to the lower part of the debenzolizer 2 through a pipeline. The lower part of the regenerator 3 is connected to the outlet of the heater 4 through a pipeline, and the top is connected to the lower part of the debenzolizer 2 through a pipeline.
[0015] When the utility model operates, the heavy oil discharged from the benzol scrubber 1 is transported to the debenzolizer 2. The debenzolized light oil is divided into three streams. The first stream is transported to the benzol scrubber 1 for benzol scrubbing. The second stream is transported to the shell side of the heat exchanger 5 and preheated by using the heat in the hot steam discharged from the debenzolizer 2. The third stream is transported to the heat exchange tubes 7 in the slag storage tank 6 and preheated by using the heat in the oil slag, so as to improve the heating efficiency of the subsequent heater 4, reduce the energy consumption of the heater 4, save energy. The two streams of light oil preheated by the heat exchanger 5 and the slag storage tank 6 flow together into the heater 4, and the temperature of the light oil is raised by using the heater 4. After heating, the light oil is divided into two streams and sent into the regenerator 3. One stream flows through the spiral tube 9 and the jacket 8 in sequence and then is sent into the debenzolizer 2. The other stream is sent into the interior of the regenerator 3, and the light oil in the spiral tube 9 and the jacket 8 provides heat for it from both the inside and the outside at the same time, preventing the temperature of the regenerated oil vapor from decreasing and ensuring a good vaporization and regeneration effect of the regenerated oil vapor. The regenerated oil vapor is sent from the top of the regenerator 3 into the debenzolizer 2. In the above process, the debenzolization of the wash oil is carried out in the debenzolizer 2, and the heat contained in the regenerated oil vapor and the circulating oil vapor transported from the regenerator 3 is used to flash-vaporize the wash oil in the debenzolizer 2 to achieve the purpose of debenzolization.
[0016] A stirrer 10 is arranged inside the regenerator 3, and the stirring blades of the stirrer 10 are located inside the spiral tube 9. The stirrer 10 is an existing technology, which can stir the light oil in the regenerator 3 to make it flow, thereby improving the vaporization and regeneration effect of the light oil.
[0017] A filter screen 11 is arranged inside the regenerator 3 above the spiral tube 9. The regenerated oil vapor often contains certain impurities and oil residues. After these oil residues and impurities enter the debenzolization tower 2, the debenzolization efficiency of the heavy oil will be affected. To prevent this situation, the filter screen 11 is set up to filter the impurities and oil residues by using the filter screen 11.
[0018] A spray head 12 is arranged above the filter screen 11. The inlet end of the spray head 12 is communicated with the air outlet at the top of the regenerator 3 through a backflush pipe 13. A backflush air pump is arranged on the backflush pipe 13. After the filter screen 11 is used for a period of time, it may adhere to more oil residues and impurities. After a long time, the filter screen 11 may be blocked. To avoid this situation, after the equipment operates for a period of time, the backflush air pump can be turned on to pump the regenerated oil vapor to the spray head 12 and then spray it onto the filter screen 11 to clean the oil residues and impurities adhered to the filter screen 11 and ensure the filtering effect of the filter screen 11.
[0019] A mixer 14 is arranged on the pipeline at the inlet end of the heater 4. The shell-side outlet of the heat exchanger 5 and the outlet end of the heat exchange tube 7 are both communicated with the inlet of the mixer 14. The mixer 14 is a prior art and can uniformly mix two or more liquids. In the present utility model, the temperatures of the two light oils preheated by hot steam and preheated by oil residues are different. If they are directly fed into the heater 4 for heating without mixing, the heating temperature of the light oil may be uneven, affecting the heating effect of the subsequent light oil. Therefore, the two light oils are uniformly mixed before mixing to output light oil with a uniform temperature and improve the heating efficiency of the subsequent heater 4 for the light oil.
[0020] Heat insulation layers are arranged on the outer walls of the heat exchanger 5 and the slag storage tank 6. Through the arrangement of the heat insulation layers, the loss of internal heat of the heat exchanger 5 and the slag storage tank 6 can be prevented, the heat loss can be reduced, and the utilization rate of heat can be improved.
Claims
1. A crude benzene distillation and wash oil regeneration heating system, comprising a benzene scrubber (1), a debenzolization column (2), a regenerator (3) and a heater (4), characterized in that : It further includes a heat exchanger (5) and a slag storage tank (6). The heavy oil outlet at the bottom of the benzene scrubbing tower (1) is connected to the heavy oil inlet at the upper part of the debenzolization tower (2) through a pipeline. The light oil inlet at the upper part of the benzene scrubbing tower (1) is connected to the light oil outlet at the bottom of the debenzolization tower (2) through a pipeline. The top outlet of the debenzolization tower (2) is connected to the tube side inlet of the heat exchanger (5) through a pipeline. A heat exchange tube (7) is arranged in the slag storage tank (6). The light oil outlet at the bottom of the debenzolization tower (2) is respectively connected to the shell side inlet of the heat exchanger (5) and the inlet end of the heat exchange tube (7) through pipelines. The shell side outlet of the heat exchanger (5) and the outlet end of the heat exchange tube (7) are connected to the inlet of the heater (4) through a pipeline. A jacket (8) is arranged on the outer wall of the regenerator (3), and a spiral tube (9) is arranged inside the regenerator (3). The upper port of the spiral tube (9) is connected to the jacket (8), and the lower port is connected to the outlet of the heater (4). The lower part of the jacket (8) is connected to the lower part of the debenzolization tower (2) through a pipeline. The lower part of the regenerator (3) is connected to the outlet of the heater (4) through a pipeline, and the top is connected to the lower part of the debenzolization tower (2) through a pipeline.
2. The crude benzene distillation and wash oil regeneration heating system according to claim 1, wherein : A stirrer (10) is arranged inside the regenerator (3), and the stirring blades of the stirrer (10) are located inside the spiral tube (9).
3. The crude benzene distillation and wash oil regeneration heating system according to claim 1, characterized in that : A filter screen (11) is arranged inside the regenerator (3) above the spiral tube (9).
4. The crude benzene distillation and wash oil regeneration heating system according to claim 3, wherein : A spray head (12) is arranged above the filter screen (11). The inlet end of the spray head (12) is connected to the gas outlet at the top of the regenerator (3) through a backwashing pipe (13), and a backwashing air pump is arranged on the backwashing pipe (13).
5. A crude benzene distillation and wash oil regeneration heating system according to claim 1, characterized in that : A mixer (14) is arranged on the pipeline at the inlet end of the heater (4). The shell side outlet of the heat exchanger (5) and the outlet end of the heat exchange tube (7) are both connected to the inlet of the mixer (14).
6. A crude benzene distillation and wash oil regeneration heating system according to claim 1, characterized in that : Heat insulation layers are arranged on the outer walls of the heat exchanger (5) and the slag storage tank (6).