Steam heat source utilization device for gasoline hydrodesulfurization fractionating tower reboiler

Abstract

The utility model relates to the technical field of gasoline production, in particular to a gasoline hydrodesulfurization fractionating tower reboiler steam heat source utilization device which comprises a fractionating tower, a reboiler A and a reboiler B. A feeding port of the reboiler B is connected with the bottom end of the fractionating tower through a feeding pipeline B, and a discharging port of the reboiler B is connected with the bottom end of the fractionating tower through a discharging pipeline B; a heat source inlet of the reboiler B is connected with a low-pressure steam input pipeline, a heat source outlet of the reboiler B is connected with a low-pressure steam output pipeline, the output end of the low-pressure steam output pipeline is connected with a steam inlet in the side part of a steam flash tank, and a steam outlet in the top of the steam flash tank is connected with a sulfur recovery device through a first pipeline; a bottom liquid outlet of the steam flash tank is connected with a condensed water pipe network through a second pipeline. The crude gasoline pre-fractionation device can effectively utilize an excessive low-pressure steam heat source in production to carry out crude gasoline pre-fractionation treatment, balances the use of the medium-pressure steam heat source and the low-pressure steam heat source, and saves energy and reduces consumption.

Description

Technical Field

[0001] This utility model relates to the field of gasoline production technology, specifically to a device for utilizing the steam heat source of a reboiler in a gasoline hydrodesulfurization fractionation tower. Background Technology

[0002] Gasoline hydrodesulfurization is a chemical treatment method used to remove sulfides from gasoline. This process primarily involves reacting hydrogen with sulfides in gasoline under the action of a catalyst to produce harmless hydrogen sulfide and hydrocarbons, thereby achieving desulfurization. The reaction is typically carried out under high temperature and high pressure conditions to improve reaction efficiency.

[0003] A typical hydrodesulfurization process includes the following steps: (1) Pretreatment: Before entering the reactor, gasoline feedstock usually undergoes a pretreatment stage to remove impurities and adjust the composition. (2) Hydrogenation reaction: The pretreated gasoline is mixed with hydrogen and enters the hydrodesulfurization reactor. In the reactor, the sulfides in the gasoline react with hydrogen under the action of a catalyst to generate sulfide gas and hydrocarbons. (3) Separation and purification: The mixture after the reaction is cooled and separated, hydrogen sulfide is removed, and the purified gasoline is used as the final product.

[0004] The pretreatment in step (1) is carried out in a pre-fractionation tower. The main function of the pre-fractionation tower is to perform preliminary separation of crude gasoline products, separating components with different boiling points so that subsequent processing can be more refined, thereby improving the quality and yield of the product.

[0005] The pre-fractionation tower is equipped with a reboiler with heating function at the bottom. In actual production, only one reboiler is usually used. The reboiler uses medium-pressure steam as a heat source. However, chemical plants may have steam balance problems. If there is already a surplus of low-pressure steam, and the reboiler uses medium-pressure steam as a heat source, it will lead to a further surplus of low-pressure steam, which is not conducive to energy saving and consumption reduction of the unit. Utility Model Content

[0006] To address the technical problem of wasted low-pressure steam heat source in existing technologies, this utility model provides a steam heat source utilization device for the reboiler of a gasoline hydrodesulfurization fractionation tower. This device can effectively utilize the excess low-pressure steam heat source in production for crude gasoline pre-fractionation, balancing the use of medium and low-pressure steam heat sources and saving energy and reducing consumption.

[0007] The technical solution adopted in this utility model is as follows:

[0008] A device for utilizing the steam heat source of a reboiler in a gasoline hydrodesulfurization fractionation tower includes a fractionation tower and a reboiler A. The feed inlet of reboiler A is connected to the bottom of the fractionation tower via a feed pipe A, and the discharge outlet of reboiler A is connected to the bottom of the fractionation tower via a discharge pipe A. The heat source inlet of reboiler A is connected to a medium-pressure steam input pipe, and the heat source outlet of reboiler A is connected to a medium-pressure steam output pipe. The device also includes a reboiler B. The feed inlet of reboiler B is connected to the bottom of the fractionation tower via a feed pipe B, and the discharge outlet of reboiler B is connected to the bottom of the fractionation tower via a discharge pipe B. The heat source inlet of reboiler B is connected to a low-pressure steam input pipe, and the heat source outlet of reboiler B is connected to a low-pressure steam output pipe. The output end of the low-pressure steam output pipe is connected to the steam inlet on the side of a steam expansion tank. The steam outlet at the top of the steam expansion tank is connected to a sulfur recovery device via a first pipeline, and the liquid outlet at the bottom of the steam expansion tank is connected to a condensate network via a second pipeline.

[0009] Furthermore, a first thermocouple and a second thermocouple are respectively installed on the discharge pipe B and the feed pipe B. Their function is to monitor the temperature of the crude gasoline before and after heating in real time, respectively, to determine whether it is within the range required by the process.

[0010] Furthermore, the low-pressure steam input pipeline is connected to the sulfur recovery unit via a third pipeline. This allows the remaining low-pressure steam to be fed into the sulfur recovery unit as a heat source, further balancing the excess low-pressure steam.

[0011] Furthermore, a flow meter is installed on the low-pressure steam input pipeline. Its function is to monitor the low-pressure steam flow rate entering reboiler B in real time and determine whether the flow rate is within the process requirements.

[0012] Furthermore, a flow regulating valve assembly is installed on the low-pressure steam output pipeline. Its function is to facilitate the regulation of the low-pressure steam flow rate entering the steam expansion vessel.

[0013] Furthermore, the first pipeline is equipped with a pressure regulating valve assembly. Its function is to control the external steam pressure via the pressure regulating valve assembly.

[0014] The beneficial effects of this utility model are as follows: The gasoline hydrodesulfurization fractionation tower reboiler steam heat source utilization device provided by this utility model, by adding reboiler B, enables the utilization of excess low-pressure steam in the crude gasoline pre-fractionation process, reducing the use of medium-pressure steam, balancing the steam of the entire plant, and the two reboilers can be used individually or simultaneously, enabling the switching of the heat source of the pre-fractionation tower. When the low-pressure steam or medium-pressure steam supply is interrupted, it can be quickly switched, reducing device fluctuations and ensuring stable operation of the device. At the same time, this utility model can use the low-pressure steam to enter the steam expansion tank to separate condensate, and obtain steam with further reduced pressure to be used as a heat source in the sulfur recovery unit, further improving the utilization rate of low-pressure steam and saving energy and reducing consumption. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0017] In the diagram, 1-medium-pressure steam input pipeline, 2-reboiler A, 3-medium-pressure steam output pipeline, 4-discharge pipeline A, 5-fractionation tower, 6-feed pipeline A, 7-discharge pipeline B, 8-second pipeline, 9-first thermocouple, 10-reboiler B, 11-feed pipeline B, 12-low-pressure steam input pipeline, 13-low-pressure steam output pipeline, 14-flow regulating valve assembly, 15-steam expansion tank, 16-first pipeline, 17-flow meter, 18-third pipeline, 19-pressure regulating valve assembly, 20-second thermocouple. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0019] Example 1

[0020] Combination Figure 1This utility model provides a device for utilizing the steam heat source of a reboiler in a gasoline hydrodesulfurization fractionation tower, including a fractionation tower 5 and a reboiler A2. The inlet of the reboiler A2 is connected to the bottom of the fractionation tower 5 via a feed pipe A6, and the outlet of the reboiler A2 is connected to the bottom of the fractionation tower 5 via a discharge pipe A4. The heat source inlet of the reboiler A2 is connected to a medium-pressure steam input pipe 1, and the heat source outlet of the reboiler A2 is connected to a medium-pressure steam output pipe 3. It also includes a reboiler B10, whose inlet is connected to the bottom of the fractionation tower 5 via a feed pipe B11, and its outlet is connected to the bottom of the fractionation tower 5 via a discharge pipe B7. The heat source inlet of the reboiler B10 is connected to a low-pressure steam input pipe 12. The heat source outlet of 10 is connected to the low-pressure steam output pipeline 13. The output end of the low-pressure steam output pipeline 13 is connected to the steam inlet on the side of the steam expansion vessel 15. The steam outlet at the top of the steam expansion vessel 15 is connected to the sulfur recovery device through the first pipeline 16. The drain outlet at the bottom of the steam expansion vessel 15 is connected to the condensate network through the second pipeline 8.

[0021] In order to monitor the temperature of crude gasoline before and after heating in real time and determine whether it is within the range required by the process, the discharge pipe B7 and the feed pipe B11 of this utility model are respectively equipped with a first thermocouple 9 and a second thermocouple 20.

[0022] In order to further balance the excess low-pressure steam and make further use of the low-pressure steam heat source, the low-pressure steam input pipeline 12 of this utility model is connected to the sulfur recovery device through the third pipeline 18, so that the excess low-pressure steam is introduced into the sulfur recovery device as a heat source for heat tracing.

[0023] In order to monitor the flow rate of low-pressure steam entering reboiler B 10 as a heat source in real time and determine whether the flow rate is within the process requirements, this utility model is equipped with a flow meter 17 on the low-pressure steam input pipeline 12 to monitor the flow rate of low-pressure steam entering reboiler B 10 in real time.

[0024] In order to regulate the flow rate of low-pressure steam entering the steam expansion vessel 15, a flow regulating valve group 14 is provided on the low-pressure steam output pipeline 13, which can regulate the flow rate of low-pressure steam entering the steam expansion vessel 15 to meet the process requirements.

[0025] In order to control the external pressure of the steam after being processed by the steam expansion vessel 15, the first pipeline 16 of this utility model is equipped with a pressure regulating valve group 19, which can regulate the external pressure of the steam.

[0026] To improve the automation level of this utility model, a controller is provided. The controller is electrically connected to the first thermocouple 9, the flow meter 17 and the flow regulating valve group 14. When the temperature detected by the first thermocouple 9 is too high, the controller controls the flow regulating valve group 14 to reduce the flow rate. When the temperature detected by the first thermocouple 9 decreases, the controller controls the flow regulating valve group 14 to increase the flow rate, thereby improving the automation level.

[0027] The working process of this utility model is as follows: when there is an excess of low-pressure steam in the factory, reboiler A2 stops working and reboiler B10 is started. The crude gasoline at the bottom of the fractionation tower 5 is drawn out through feed pipe B11, heated by reboiler B10, and then sent back to the bottom of the fractionation tower 5 through discharge pipe B7. Low-pressure steam of 1.0MPa is introduced into low-pressure steam input pipe 12. If the steam flow rate is too large, part of it is sent to the third pipeline 18 for external use, and the remaining part enters the reboiler B10 as a heat source. The low-pressure steam after heat exchange enters the steam expansion tank 15 through low-pressure steam output pipe 13 to reduce pressure and expand capacity. After the steam is reduced to 0.4MPa, it is discharged at the top of the steam expansion tank 15 and sent to the outside through the first pipeline 16. Condensate is discharged at the bottom of the steam expansion tank 15 and enters the condensate network through the second pipeline 8.

[0028] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention.

Claims

1. A device for utilizing the steam heat source of a reboiler in a gasoline hydrodesulfurization fractionation tower, comprising a fractionation tower and a reboiler A, wherein the inlet of the reboiler A is connected to the bottom of the fractionation tower via a feed pipe A, the outlet of the reboiler A is connected to the bottom of the fractionation tower via a discharge pipe A, the heat source inlet of the reboiler A is connected to a medium-pressure steam input pipe, and the heat source outlet of the reboiler A is connected to a medium-pressure steam output pipe, characterized in that... It also includes a reboiler B, whose inlet is connected to the bottom of the fractionation tower via a feed pipe B, and whose outlet is connected to the bottom of the fractionation tower via a discharge pipe B. The heat source inlet of the reboiler B is connected to a low-pressure steam input pipe, and the heat source outlet of the reboiler B is connected to a low-pressure steam output pipe. The output end of the low-pressure steam output pipe is connected to the steam inlet on the side of the steam expansion vessel. The steam outlet at the top of the steam expansion vessel is connected to a sulfur recovery unit via a first pipeline, and the drain outlet at the bottom of the steam expansion vessel is connected to a condensate network via a second pipeline.

2. The device for utilizing the steam heat source of a reboiler in a gasoline hydrodesulfurization fractionation tower as described in claim 1, characterized in that, The discharge pipe B and the feed pipe B are respectively equipped with a first thermocouple and a second thermocouple.

3. The device for utilizing the steam heat source of the reboiler in a gasoline hydrodesulfurization fractionation tower as described in claim 1, characterized in that, The low-pressure steam input pipeline is connected to the sulfur recovery unit via a third pipeline.

4. The device for utilizing the steam heat source of the reboiler in a gasoline hydrodesulfurization fractionation tower as described in claim 1, characterized in that, A flow meter is installed on the low-pressure steam input pipeline.

5. The device for utilizing the steam heat source of the reboiler in a gasoline hydrodesulfurization fractionation tower as described in claim 1, characterized in that, A flow regulating valve assembly is installed on the low-pressure steam output pipeline.

6. The device for utilizing the steam heat source of the reboiler in a gasoline hydrodesulfurization fractionation tower as described in claim 1, characterized in that, The first pipeline is equipped with a pressure regulating valve assembly.

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