C10 recovery device capable of generating steam
By designing a C10 recovery unit that can generate steam, and utilizing a two-stage preheater and circulation loop technology, the problem of efficient recovery and separation of C10 and lower products in refineries has been solved, achieving anti-coking of catalysts and extension of production cycles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-04-03
AI Technical Summary
Existing refineries have difficulty accurately separating reforming feedstocks with C10 and below, leading to catalyst coking and shortening the production cycle.
Design a C10 recovery device that can generate steam. By setting up a two-stage preheater, a tower top steam generator, and a tower top hot water heat exchanger, a product circulation loop and a preheating circulation loop are formed to achieve efficient recovery and separation of C10 and lower products.
It improved the recovery rate and purity of C10 and below products, extended the production cycle of the reforming process, improved heat recovery efficiency and raw material utilization, and avoided catalyst coking.
Smart Images
Figure CN121780195A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of petroleum refining technology and relates to a recovery device, particularly a C10 recovery device capable of generating steam. Background Technology
[0002] Continuous reforming is a refining process primarily used to convert low-octane naphtha (a type of light oil) into high-octane gasoline components and important chemical feedstocks such as benzene, toluene, and xylene. These products can be used to blend high-quality automotive gasoline or as basic raw materials in the manufacture of plastics, synthetic fibers, and other chemical products.
[0003] However, this process has very strict requirements for raw materials. If the raw materials contain too many heavy components with more than 11 carbon atoms (i.e., C11 or higher), or if the final boiling point of the raw materials is too high (above 180°C), then polycyclic aromatic hydrocarbons (PAHs) are easily generated during the reaction. These are substances that easily cause the catalyst to "coke". Once carbon accumulates on the catalyst surface too quickly, frequent shutdowns for regeneration are required, greatly shortening the production cycle and affecting efficiency and cost.
[0004] Therefore, the ideal reforming feedstock should be a light component with no more than 10 carbon atoms (C10 and below) and a final boiling point controlled below 180°C.
[0005] Currently, most domestic refineries still directly use heavy naphtha with carbon numbers between C7 and C12 as reforming feedstock, and cannot accurately separate reforming feedstock with C10 and below, which makes the catalyst prone to "coking" and greatly shortens the production cycle. Summary of the Invention
[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a C10 recycling device that can effectively achieve the recycling of C10 and below.
[0007] The objective of this invention can be achieved through the following technical solution: a C10 recovery device capable of generating steam, comprising:
[0008] Along the recycling path of C10 and below products, a first feed preheater, a second feed preheater, a C10 cutting tower, a tower top steam generator, and a tower top hot water heat exchanger are sequentially installed. The first and second feed preheaters preheat the feed oil, allowing it to enter the C10 cutting tower at a preset temperature for separation, forming gaseous light components. The tower top steam generator is connected between the top of the C10 cutting tower and the tower top hot water heat exchanger, performing secondary condensation on the gaseous light components. The condensation of the light components by the tower top steam generator produces low-pressure steam and liquid light components after primary condensation. The condensation of the liquid light components by the tower top hot water heat exchanger produces hot water for heat tracing and C10 and below products. The C10 and below products are output as reforming feedstock in the form of hot discharge.
[0009] In the aforementioned C10 recovery device capable of generating steam, the output end of the hot water heat exchanger at the top of the tower is connected to the reflux tank at the top of the tower. A portion of the C10 and lower products flowing out from the reflux tank at the top of the tower return to the C10 cutting tower, and a portion is output as reforming feed in the form of hot discharge. A product circulation loop is formed between the C10 cutting tower, the steam heat exchanger at the top of the tower, the hot water heat exchanger at the top of the tower, and the reflux tank at the top of the tower.
[0010] In the aforementioned C10 recovery unit that can generate steam, the output end of the top reflux tank forms three branches, namely the first branch, the second branch, and the third branch. In the first branch, liquid C10 and lower products are refluxed back to the C10 cutting tower; in the second branch, liquid C10 and lower products are fed into the reforming unit as reforming feedstock in the form of hot discharge; and in the third branch, liquid C10 and lower products are fed into the tank area after being cooled by the product water cooler.
[0011] In the aforementioned C10 recovery device capable of generating steam, a first preheating circulation loop is formed between the first feed preheater and the top of the C10 cutting tower.
[0012] In the aforementioned C10 recovery device capable of generating steam, a second preheating circulation loop is formed between the second feed preheater and the bottom of the C10 cutting tower.
[0013] In the aforementioned C10 recovery device capable of generating steam, a reboiler is provided in the second preheating circulation loop. The two ends of the reboiler are connected to the bottom of the C10 cutting tower and the tower body of the C10 cutting tower, respectively. The heavy components generated at the bottom of the C10 cutting tower flow out from the bottom of the tower, are heated and vaporized by the reboiler, and then flow back to the C10 cutting tower.
[0014] The aforementioned C10 recovery device capable of generating steam also includes a heavy component output channel, and a bottom steam generator and a bottom oil aftercooler are sequentially arranged along the heavy component output direction. The bottom steam generator is connected to the second feed preheater, and the heavy component is output after secondary condensation through the bottom steam generator and the bottom oil aftercooler.
[0015] The present invention also provides a C10 recovery device capable of generating steam, comprising:
[0016] Along the recycling path of C10 and below products, a first feed preheater, a second feed preheater, a C10 cutting tower, a tower top steam generator, and a tower top heat pump steam generator are sequentially installed. The first and second feed preheaters preheat the feed oil, allowing it to enter the C10 cutting tower at a preset temperature for separation, forming gaseous light components. The tower top steam generator is connected between the top of the C10 cutting tower and the tower top heat pump steam generator to perform secondary condensation on the gaseous light components. The tower top steam generator generates low-pressure steam and liquid light components after primary condensation of the light components. The tower top heat pump steam generator generates high-pressure steam and C10 and below products after condensation of the liquid light components. The C10 and below products are output as reforming feedstock in the form of hot discharge.
[0017] In the aforementioned C10 recovery device capable of generating steam, a first preheating circulation loop is formed between the first feed preheater and the top of the C10 cutting tower; a second preheating circulation loop is formed between the second feed preheater and the bottom of the C10 cutting tower. A bottom reboiler is provided in the second preheating circulation loop, and the two ends of the bottom reboiler are respectively connected to the bottom of the C10 cutting tower and the body of the C10 cutting tower.
[0018] The aforementioned C10 recovery device capable of generating steam also includes a heavy component output channel, and a bottom steam generator and a bottom heat pump steam generator are sequentially arranged along the heavy component output direction. The bottom steam generator is connected to the second feed preheater, and the heavy component is output after secondary condensation through the bottom steam generator and the bottom heat pump steam generator.
[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0020] (1) By setting up a two-stage preheater, the recovery rate of C10 and below products is improved, while the accumulation of C11 and above products at the top of the tower is inhibited, thereby avoiding coking of the catalyst in the C10 cutting tower and extending the production cycle of the reforming process.
[0021] (2) Setting up a top steam generator and a top hot water heat exchanger is, on the one hand, to realize the condensation treatment of the light components output from the top of the tower, converting the gaseous light components into liquid C10 and below products, which can be directly used as reforming raw materials. On the other hand, the light components can generate low-pressure steam and hot water for heat tracing during the condensation process, and the low-pressure steam and hot water for heat tracing can be used to heat other equipment, thereby improving heat recovery efficiency.
[0022] (3) By setting up a product circulation loop, it helps to form a gas-liquid balance in the C10 cutting tower, thereby improving the separation accuracy between C10 and below products and C11 and above components, thus improving the purity of C10 and below products and ensuring product quality. In addition, reflux helps to control the temperature at the top of the C10 cutting tower and avoid drastic changes in tower temperature.
[0023] (4) By setting up a third branch, when the reforming unit malfunctions and needs to be repaired, or when the reforming unit's capacity cannot keep up with the input speed of the reforming raw materials, the excess liquid C10 and below products can be temporarily stored in the tank area. Since the temperature that the tank area can withstand is within a certain range, it is necessary to further cool the liquid C10 and below products through the product water cooler before they can be temporarily stored in the tank area. This avoids the waste of reforming raw materials and damage to the tank area, and improves the utilization rate of reforming raw materials.
[0024] (5) The heat at the top of the C10 cutting tower returns to the first preheater through the first preheating circulation loop, providing the feed temperature for the new feed oil, so that the new feed oil can reach the preset temperature more quickly. On the one hand, it improves the utilization rate of heat in the C10 cutting tower, and on the other hand, it can accelerate the output speed of C10 and below products.
[0025] (6) By setting up a reboiler at the bottom of the tower, the heavy components are re-vaporized to produce light components, thereby separating more C10 and below products from the C10 cutting tower, producing more reforming feedstock, and improving the utilization rate of feedstock oil. In addition, by setting up the first preheating circulation loop, the feedstock oil in the C10 cutting tower is guaranteed to have a higher temperature, which can reduce the load on the reboiler at the bottom of the tower and reduce energy loss. Attached Figure Description
[0026] Figure 1 This is a process flow diagram of a C10 recovery device capable of generating steam according to the present invention.
[0027] Figure 2 This is a process flow diagram of another embodiment of a C10 recovery device capable of generating steam according to the present invention.
[0028] In the diagram, 1. First feed preheater; 2. Second feed preheater; 3. C10 cutting tower; 4. Top steam generator; 5. Top hot water heat exchanger; 6. Top reflux tank; 7. Product water cooler; 8. Bottom reboiler; 9. Bottom steam generator; 10. Bottom oil aftercooler; 11. Top heat pump steam generator; 12. Bottom heat pump steam generator. Detailed Implementation
[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.
[0031] Example 1
[0032] like Figure 1 As shown, the present invention provides a C10 recovery device capable of generating steam, comprising:
[0033] Along the recycling path of C10 and below products, a first feed preheater 1, a second feed preheater 2, a C10 cutting tower 3, a tower top steam generator 4, and a tower top hot water heat exchanger 5 are sequentially arranged. The first feed preheater 1 and the second feed preheater 2 preheat the feed oil, allowing the feed oil to enter the C10 cutting tower 3 at a preset temperature for separation, forming gaseous light components. The tower top steam generator 4 is connected between the top of the C10 cutting tower 3 and the tower top hot water heat exchanger 5 to perform secondary condensation of the gaseous light components. The tower top steam generator 4 generates low-pressure steam and liquid light components after primary condensation of the light components. The tower top hot water heat exchanger 5 generates hot water for heat tracing and C10 and below products after condensation of the liquid light components. The C10 and below products are output as reforming feed in the form of hot discharge.
[0034] It is worth mentioning that by setting up a two-stage preheater, the recovery rate of C10 and below products is improved, while simultaneously preventing the enrichment of C11 and above products at the top of the tower. This avoids coking of the catalyst in the C10 cutting tower 3, thereby extending the production cycle of the reforming process.
[0035] In addition, the purpose of setting up the top steam generator 4 and the top hot water heat exchanger 5 is twofold: firstly, to condense the light components output from the top of the tower, converting the gaseous light components into liquid C10 and below products, which can be directly used as reforming feedstock; secondly, the light components can generate low-pressure steam and hot water for heat tracing during the condensation process, which can be used to heat other equipment, thereby improving heat recovery efficiency.
[0036] It is worth mentioning that since the light components produced by the separation of feedstock oil in C10 cutting tower 3 are in gaseous form, they need to be collected at the top of the tower. Therefore, both the top steam generator 4 and the top hot water heat exchanger 5 are connected to the top of C10 cutting tower 3. In addition, the light components in the top steam generator 4 exchange heat with demineralized water, where the light components condense and release condensate, and the demineralized water vaporizes into low-pressure steam. In the top hot water heat exchanger 5, the light components condensed in the top steam generator 4 exchange heat with low-temperature water, where the light components condense again to form C10 and lower grade products, while the low-temperature water is heated to provide hot water for heat tracing.
[0037] It is further noted that the preset temperature is 243℃.
[0038] More preferably, the output end of the hot water heat exchanger 5 at the top of the tower is connected to the reflux tank 6 at the top of the tower. A portion of the C10 and lower products flowing out from the reflux tank 6 are returned to the C10 cutting tower 3, and a portion is output as reforming raw material in the form of hot discharge. A product circulation loop is formed between the C10 cutting tower 3, the steam heat exchanger at the top of the tower, the hot water heat exchanger at the top of the tower 5, and the reflux tank 6.
[0039] In this embodiment, by setting up a product circulation loop, it is helpful to form a gas-liquid balance in the C10 cutting tower 3, thereby improving the separation accuracy between C10 and below products and C11 and above components, thus improving the purity of C10 and below products and ensuring product quality. In addition, reflux helps to control the temperature at the top of the C10 cutting tower 3 and avoid drastic temperature changes.
[0040] More preferably, the output end of the top reflux tank 6 forms three branches, namely the first branch, the second branch and the third branch. The liquid C10 and below products in the first branch are refluxed to the C10 cutting tower 3; the liquid C10 and below products in the second branch are fed into the reforming unit as reforming feedstock in the form of hot discharge; and the liquid C10 and below products in the third branch are fed into the tank area after being cooled by the product water cooler 7.
[0041] In this embodiment, by setting up a third branch, when the reforming unit malfunctions and needs maintenance, or when the reforming unit's capacity cannot keep up with the input speed of the reforming raw materials, excess liquid C10 and below products can be temporarily stored in the tank area. Since the temperature that the tank area can withstand is within a certain range, it is necessary to further cool the liquid C10 and below products through the product water cooler 7 before they can be temporarily stored in the tank area. This avoids waste of reforming raw materials and damage to the tank area, and improves the utilization rate of reforming raw materials.
[0042] Preferably, a first preheating circulation loop is formed between the first feed preheater 1 and the top of the C10 cutting tower 3.
[0043] In this embodiment, the heat at the top of the C10 cutting tower 3 returns to the first preheater through the first preheating circulation loop, providing the feed temperature for the new feed oil, so that the new feed oil can reach the preset temperature more quickly. On the one hand, this improves the utilization rate of heat in the C10 cutting tower 3, and on the other hand, it can accelerate the output speed of C10 and below products.
[0044] Preferably, a second preheating circulation loop is formed between the second feed preheater 2 and the bottom of the C10 cutting tower 3.
[0045] More preferably, a reboiler 8 is provided in the second preheating circulation loop, and the two ends of the reboiler 8 are connected to the bottom of the C10 cutting tower 3 and the tower body of the C10 cutting tower 3, respectively. The heavy components generated at the bottom of the C10 cutting tower 3 flow out from the bottom of the tower, are heated and vaporized by the reboiler 8, and then flow back to the C10 cutting tower 3.
[0046] In this embodiment, by setting up a reboiler 8 at the bottom of the tower, the heavy components are re-vaporized to produce light components, thereby separating more C10 and lower products from the C10 cutting tower 3, producing more reforming feedstock, and improving the utilization rate of feedstock oil. In addition, by setting up the first preheating circulation loop, the feedstock oil in the C10 cutting tower 3 is guaranteed to have a higher temperature, which can reduce the load on the reboiler 8 at the bottom of the tower and reduce energy loss.
[0047] Preferably, it also includes a heavy component output channel, and a bottom steam generator 9 and a bottom oil aftercooler 10 are sequentially arranged along the heavy component output direction. The bottom steam generator 9 is connected to the second feed preheater 2, and the heavy component is output to the next device after secondary condensation through the bottom steam generator 9 and the bottom oil aftercooler 10. Such as a diesel refining unit.
[0048] It is worth mentioning that a portion of the heavy component flowing out from the bottom of the C10 cutting tower 3 enters the C10 cutting tower 3 through the bottom reboiler 8, where the light component is further separated. The other portion flows through the second feed preheater 2 to the bottom steam generator 9 and the bottom oil aftercooler 10. The heavy component is condensed by the bottom steam generator 9, and the demineralized water in the bottom steam generator 9 is vaporized into low-pressure steam. The heavy component that has been condensed by the bottom steam generator 9 is condensed again by the bottom oil aftercooler 10, and the demineralized water in the bottom oil aftercooler 10 is heated into hot water for heat tracing and output.
[0049] In addition, both the low-pressure steam generated by the bottom steam generator 9 and the hot water for heat tracing generated by the bottom oil aftercooler 10 can provide heat to other equipment.
[0050] Therefore, the C10 recovery device that generates steam provided by this invention can not only obtain C10 and lower grade products as reforming feedstock, but also generate a variety of by-products, increasing the added value of the device. For example, the low-pressure steam generated by the top steam generator and the bottom steam generator 9, and the hot water for heat tracing generated by the top hot water heat exchanger 5 and the bottom oil aftercooler 10 can all provide heat to other equipment. The heavy components generated by the bottom oil aftercooler 10 can also be used as feedstock for diesel refining, thereby improving the utilization rate of feedstock oil.
[0051] Example 2
[0052] like Figure 2 As shown, the difference between this embodiment and embodiment one is that in embodiment one, the structure connected to the top steam generator 4 is the top hot water heat exchanger 5, and the structure connected to the bottom steam generator 9 is the bottom oil aftercooler 10. In this embodiment, the structure connected to the top steam generator 4 is the top heat pump steam generator 11, and the structure connected to the bottom oil aftercooler 10 is the bottom heat pump steam generator 12.
[0053] It is worth mentioning that in Embodiment 1, the top steam generator 4 is connected to the top hot water heat exchanger 5, and the bottom steam generator 9 is connected to the bottom oil aftercooler 10, mainly for collecting hot water for heat tracing and providing heat treatment for other equipment; while in this embodiment, the top steam generator 4 is connected to the top heat pump steam generator 11, and the bottom steam generator 9 is connected to the bottom heat pump steam generator 12, mainly for collecting steam and providing heat treatment for other equipment, such as providing heat for the sulfur plant.
[0054] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0055] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.
[0056] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.
Claims
1. A C10 recovery device capable of generating steam, characterized in that, include: Along the recycling path of C10 and below products, a first feed preheater, a second feed preheater, a C10 cutting tower, a tower top steam generator, and a tower top hot water heat exchanger are sequentially installed. The first and second feed preheaters preheat the feed oil, allowing it to enter the C10 cutting tower at a preset temperature for separation, forming gaseous light components. The tower top steam generator is connected between the top of the C10 cutting tower and the tower top hot water heat exchanger, performing secondary condensation on the gaseous light components. The condensation of the light components by the tower top steam generator produces low-pressure steam and liquid light components after primary condensation. The condensation of the liquid light components by the tower top hot water heat exchanger produces hot water for heat tracing and C10 and below products. The C10 and below products are output as reforming feedstock in the form of hot discharge.
2. The C10 recovery device capable of generating steam according to claim 1, characterized in that, The output end of the hot water heat exchanger at the top of the tower is connected to the reflux tank at the top of the tower. A portion of the C10 and lower products flowing out of the reflux tank at the top of the tower return to the C10 cutting tower, and a portion is output as reforming feed in the form of hot discharge. A product circulation loop is formed between the C10 cutting tower, the steam heat exchanger at the top of the tower, the hot water heat exchanger at the top of the tower, and the reflux tank at the top of the tower.
3. The C10 recovery device capable of generating steam according to claim 2, characterized in that, The output end of the top reflux tank forms three branches: the first branch, the second branch, and the third branch. In the first branch, liquid C10 and below products are refluxed back to the C10 cutting tower; in the second branch, liquid C10 and below products are fed into the reforming unit as reforming feedstock in the form of hot discharge; and in the third branch, liquid C10 and below products are fed into the tank area after being cooled by the product water cooler.
4. The C10 recovery device capable of generating steam according to claim 1, characterized in that, The first preheating circulation loop is formed between the first feed preheater and the top of the C10 cutting tower.
5. The C10 recovery device capable of generating steam according to claim 1, characterized in that, A second preheating circulation loop is formed between the second feed preheater and the bottom of the C10 cutting tower.
6. The C10 recovery device capable of generating steam according to claim 5, characterized in that, A reboiler is installed at the bottom of the column in the second preheating cycle loop. The two ends of the reboiler are connected to the bottom of the C10 cutting column and the column body of the C10 cutting column, respectively. The heavy components generated at the bottom of the C10 cutting column flow out from the bottom of the column, are heated and vaporized by the reboiler, and then flow back to the C10 cutting column.
7. The C10 recovery device capable of generating steam according to claim 1, characterized in that, It also includes a heavy component output channel, and a bottom steam generator and a bottom oil aftercooler are arranged sequentially along the heavy component output direction. The bottom steam generator is connected to the second feed preheater, and the heavy component is output after secondary condensation through the bottom steam generator and the bottom oil aftercooler.
8. A C10 recovery device capable of generating steam, characterized in that, include: Along the recycling path of C10 and below products, a first feed preheater, a second feed preheater, a C10 cutting tower, a tower top steam generator, and a tower top heat pump steam generator are sequentially installed. The first and second feed preheaters preheat the feed oil, allowing it to enter the C10 cutting tower at a preset temperature for separation, forming gaseous light components. The tower top steam generator is connected between the top of the C10 cutting tower and the tower top heat pump steam generator to perform secondary condensation on the gaseous light components. The tower top steam generator generates low-pressure steam and liquid light components after primary condensation of the light components. The tower top heat pump steam generator generates high-pressure steam and C10 and below products after condensation of the liquid light components. The C10 and below products are output as reforming feedstock in the form of hot discharge.
9. The C10 recovery device capable of generating steam according to claim 8, characterized in that, A first preheating circulation loop is formed between the first feed preheater and the top of the C10 cutting tower; a second preheating circulation loop is formed between the second feed preheater and the bottom of the C10 cutting tower. A bottom reboiler is provided in the second preheating circulation loop, and the two ends of the bottom reboiler are connected to the bottom of the C10 cutting tower and the body of the C10 cutting tower, respectively.
10. The C10 recovery device capable of generating steam according to claim 8, characterized in that, It also includes a heavy component output channel, and a bottom steam generator and a bottom heat pump steam generator are arranged sequentially along the heavy component output direction. The bottom steam generator is connected to the second feed preheater. The heavy component is output after secondary condensation through the bottom steam generator and the bottom heat pump steam generator.