A volatile organic compound treatment device and method for naphtha storage tank

Abstract

This application discloses a device and method for treating volatile organic compounds (VOCs) in naphtha storage tanks, mainly relating to the field of VOC treatment technology for oil storage tanks. It addresses the problem that most existing methods extract VOCs after they are generated in the liquid state of the storage tank, failing to reduce VOCs at the source. The device includes: a buffer tank pump connected to a first transfer pump; the first transfer pump is also connected to a feed heat exchanger; the feed heat exchanger is also connected to a stabilizer tower and a cooler; the stabilizer tower is also connected to a reboiler, an air cooler, and a second transfer pump; the reboiler is connected to an asphalt constant-temperature oil transfer device; the air cooler is connected to a reflux tank; and the reflux tank is also connected to the second transfer pump, an asphalt three-top gas-liquid ring pump, and a heavy, low-quality oil device.

Description

Technical Field

[0001] This application relates to the field of volatile organic compound (VOC) treatment technology for oil storage tanks, and in particular to a device and method for treating VOCs in naphtha storage tanks. Background Technology

[0002] Volatile organic compounds (VOCs) are precursors to PM2.5 and ozone. Specifically, when naphtha enters storage tanks, it contains a significant amount of liquefied petroleum gas components, which generate VOCs during storage. These VOCs are rich in light hydrocarbon components. The entry of this product into the tank farm can cause serious volatilization and excessively high concentrations of propane exceeding the lower explosive limit in the naphtha gas at the loading platform.

[0003] One technical solution to the problem of excessively high volatile organic compound (VOC) concentration is a VOC collection system (CN202110221225.X). A first pressure transmitter is installed on the top of a storage tank. The tank's gas phase pipeline is sequentially connected to a second shut-off valve, a first gas-liquid separator, an extraction device, a second gas-liquid separator, and a associated gas system. The first pressure transmitter is connected to the input terminal of a controller, and the controller's output terminal is connected to the second shut-off valve and the extraction device. When the tank pressure detected by the first pressure transmitter reaches the start-up set value, the controller opens the second shut-off valve and starts the extraction device to collect the VOCs in the tank into the associated gas system. When the tank pressure detected by the first pressure transmitter drops to the stop set value, the controller disconnects the second shut-off valve and stops the extraction device.

[0004] However, most existing methods extract volatile organic compounds (VOCs) after they are generated in the liquid state of the storage tank, which cannot reduce VOCs at the source. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this application provides a device and method for treating volatile organic compounds (VOCs) in naphtha storage tanks, thereby solving the problem that most existing methods extract VOCs after they are generated in the liquid state of the storage tank, failing to reduce VOCs at the source.

[0006] In a first aspect, this application provides a volatile organic compound (VOC) treatment device for naphtha storage tanks, comprising: a buffer tank pump connected to a first transfer pump; the first transfer pump also connected to a feed heat exchanger; the feed heat exchanger also connected to a stabilizer and a cooler; the stabilizer also connected to a reboiler, an air cooler, and a second transfer pump; the reboiler connected to an asphalt secondary oil transfer device; the air cooler connected to a reflux tank; and the reflux tank also connected to the second transfer pump, an asphalt triple-top gas-liquid ring pump, and a heavy inferior oil device.

[0007] Furthermore, the buffer tank pump is equipped with a naphtha output pipeline; the buffer tank pump is connected to the first delivery pump, specifically including: the buffer tank pump is connected to the first delivery pump through the naphtha output pipeline.

[0008] Furthermore, the stabilizer includes a top, a body, and a bottom; the feed heat exchanger is equipped with a liquid inlet transmission pipe and a liquid recovery pipe; the feed heat exchanger is connected to the stabilizer body via the liquid inlet transmission pipe; and the feed heat exchanger is connected to the stabilizer bottom via the liquid recovery pipe.

[0009] Furthermore, the reflux tank is also equipped with a reflux flow control device and an external oil delivery control device.

[0010] Furthermore, the reflux tank is equipped with a non-condensable gas output pipeline and an oil output pipeline; the non-condensable gas output pipeline is connected to the asphalt three-top gas-liquid ring pump; and the oil output pipeline is connected to the heavy and inferior oil device.

[0011] Furthermore, the reboiler is equipped with a heat source input pipe and a heat source output pipe; the reboiler is connected to the asphalt secondary oil transmission device through the heat source input pipe; the reboiler is connected to the secondary oil recovery device through the heat source output pipe.

[0012] Furthermore, the reboiler is also equipped with heat source No. 1 pipe and heat source No. 2 pipe; the stabilizer is equipped with an output naphtha interface and an input naphtha interface; the output naphtha interface is connected to heat source No. 1 pipe; and the heat source No. 2 pipe is connected to the input naphtha interface.

[0013] Furthermore, the buffer tank pump is also connected to the naphtha storage unit.

[0014] Furthermore, the buffer tank pump is also equipped with a naphtha input pipeline; the buffer tank pump is connected to the naphtha storage device through the naphtha input pipeline.

[0015] Secondly, this application provides a method for treating volatile organic compounds (VOCs) in naphtha storage tanks, applied to a VOC treatment device for naphtha storage tanks. The method comprises: inputting naphtha from the naphtha storage device into a buffer tank pump, pressurizing it through a first transfer pump, inputting the naphtha into a feed heat exchanger for heating, and inputting the naphtha into a stabilization tower after reaching a preset temperature value; heating the naphtha in the stabilization tower through a reboiler to generate volatile organic compounds and non-volatile liquids; wherein the reboiler uses as a heat source from the asphalt secondary oil transfer device; and in the case of volatile organic compounds... After the organic matter rises to the top of the stabilizer, it condenses into liquid organic matter in the air cooler and is transferred to the reflux tank. Based on the preset reflux flow rate, the external output is determined. The second transfer pump provides the transmission power to return the preset reflux flow rate of liquid organic matter in the reflux tank to the buffer tank pump. The external output liquid organic matter in the reflux tank is transferred to the heavy and inferior oil unit. The output liquid volume is obtained from the bottom of the stabilizer and transferred to the feed heat exchanger as a heat source for heating naphtha. Then it is transferred to the cooler. After the liquid temperature is reduced to the preset minimum temperature by the cooler, it is output.

[0016] Those skilled in the art will understand that this application has at least the following beneficial effects:

[0017] This application utilizes the heat from the high-temperature liquid output from the stabilizer in the feed heat exchanger to heat the naphtha. The naphtha is then reheated in the stabilizer using external high-temperature atmospheric secondary oil as a heat source, causing the light hydrocarbon components and saturated vapor in the naphtha to rise to the top of the stabilizer for collection. This addresses the problem of excessively high volatile organic compound concentrations in the tank farm at its source. Furthermore, this device achieves thermal integration by utilizing the asphalt unit (high-temperature atmospheric secondary oil) and the high-temperature liquid it processes, thereby improving energy utilization and reducing energy consumption. Attached Figure Description

[0018] The following description refers to some embodiments of this disclosure, in which:

[0019] Figure 1 This is a schematic diagram of the internal structure of a volatile organic compound treatment device for naphtha storage tanks provided in an embodiment of this application.

[0020] Figure 2 This is a flowchart of a method for treating volatile organic compounds in naphtha storage tanks provided in an embodiment of this application.

[0021] List of reference numerals in the attached diagram:

[0022] 1. Buffer tank pump; 2. First transfer pump; 3. Feed heat exchanger; 4. Stabilizer; 5. Cooler; 6. Reboiler; 7. Air cooler; 8. Second transfer pump; 9. Reflux tank; 10. Asphalt three-top gas-liquid ring pump; 11. Heavy and inferior oil unit; 12. Asphalt constant oil transfer unit. Detailed Implementation

[0023] Those skilled in the art should understand that the embodiments described below are merely preferred embodiments of this disclosure and do not imply that this disclosure can only be implemented through these preferred embodiments. These preferred embodiments are merely used to explain the technical principles of this disclosure and are not intended to limit the scope of protection of this disclosure. Based on the preferred embodiments provided by this disclosure, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of this disclosure.

[0024] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0025] The technical solutions proposed in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] Figure 1 This application provides an embodiment of a volatile organic compound (VOC) treatment device for naphtha storage tanks. For example... Figure 1 As shown, the device provided in this application embodiment mainly includes: a buffer tank pump 1, a first conveying pump 2, a feed heat exchanger 3, a stabilizer tower 4, a cooler 5, a reboiler 6, an air cooler 7, a second conveying pump 8, a reflux tank 9, an asphalt three-top gas-liquid ring pump 10, a heavy and inferior oil device 11, and an asphalt constant two-line oil transmission device 12.

[0027] The buffer tank pump 1 is a buffer tank equipped with a pressure pump. It is capable of inputting and outputting naphtha. As an example, the buffer tank pump 1 is provided with a naphtha output pipeline; the buffer tank pump 1 is connected to the first delivery pump 2 through the naphtha output pipeline, and outputs naphtha to the first delivery pump 2.

[0028] As an example two, the buffer tank pump 1 is also connected to the naphtha storage device, and the buffer tank pump 1 is also provided with a naphtha input pipe; the buffer tank pump 1 is connected to the naphtha storage device through the naphtha input pipe to input naphtha into the naphtha storage device.

[0029] The first pump 2 and the second pump 8 are both any feasible machines capable of extracting or pressing liquids.

[0030] Among them, the feed heat exchanger 3 is a heat exchanger that can obtain the high-temperature liquid from the bottom of the stabilizer tower 4 and the naphtha input from the buffer tank pump 1, and can heat the naphtha with the help of the high-temperature liquid from the bottom of the tower.

[0031] As an example, the feed heat exchanger 3 is provided with a liquid inlet transmission pipe and a liquid recovery pipe; naphtha is input to the stabilizer tower 4 through the liquid inlet transmission pipe; and the high-temperature liquid at the bottom of the stabilizer tower 4 is obtained through the liquid recovery pipe.

[0032] Among them, stabilization tower 4 can be any existing model of stabilization tower capable of processing naphtha.

[0033] As an example, the stabilization tower 4 includes a tower top, a tower body, and a tower bottom; the tower top can collect rising gas, the tower body can receive incoming naphtha, and the tower bottom can collect and recover the high-temperature liquid from the discharged gas.

[0034] Among them, cooler 5 can be any feasible cooler 5 capable of cooling high-temperature liquids.

[0035] Among them, the reboiler 6 is any feasible machine that can heat the liquid entering and leaving the stabilizer tower 4 with the help of an external heat source and return the liquid.

[0036] As an example, the reboiler 6 is equipped with a heat source input pipe and a heat source output pipe; the reboiler 6 is connected to the asphalt constant second line oil transmission device 12 through the heat source input pipe; the reboiler 6 is connected to the constant second line oil recovery device through the heat source output pipe to obtain an external heat source.

[0037] As an example, the reboiler 6 is also equipped with heat source pipe 1 and heat source pipe 2; the stabilizer 4 is equipped with an output naphtha port and an input naphtha port; the output naphtha port is connected to heat source pipe 1; and the heat source pipe 2 is connected to the input naphtha port, so as to realize the heating of liquid by means of external heat source in reboiler 6.

[0038] Among them, the air cooler 7 is any feasible air cooler 5 capable of cooling high-temperature gas.

[0039] The reflux tank 9 can be any feasible device capable of receiving the condensed liquid and non-condensable gas from the air cooler 5. It can also output the non-condensable gas to the asphalt triple-top gas-liquid ring pump 10, control the amount of liquid refluxed to the stabilizer tower 4, and control the output to the heavy and inferior oil device 11.

[0040] As an example, the reflux tank 9 is also equipped with a reflux flow control device and an external oil output control device. The reflux flow control device is any feasible device capable of controlling the specific amount of liquid refluxed to the stabilizer tower 4, and the external oil output control device is any feasible device capable of controlling the specific amount of liquid output to the heavy and inferior oil device 11.

[0041] As a further example, the reflux tank 9 is equipped with a non-condensable gas output pipe and an oil output pipe; the non-condensable gas output pipe is connected to the asphalt three-top gas gas-liquid ring pump 10, which can output non-condensable gas to the asphalt three-top gas gas-liquid ring pump 10; the oil output pipe is connected to the heavy and inferior oil device 11, which can output solidified liquid to the heavy and inferior oil device 11.

[0042] Among them, the asphalt three-top gas-liquid ring pump 10 is an external device, a type of asphalt pump, which is used in this application to recover non-condensable gas.

[0043] Among them, the heavy and inferior oil device 11 is an external device used in this application to recover the solidified liquid of volatile organic compounds.

[0044] Among them, the asphalt constant second line oil transmission device 12 is an external device, which is used in this application to input high temperature constant second line oil into the reboiler 6 as a heat source to heat the liquid from the stabilizer tower 4.

[0045] Based on the above description, those skilled in the art will understand that this application discloses a volatile organic compound (VOC) treatment device for naphtha storage tanks. The device connects a buffer tank pump 1 to a first transfer pump 2 (specifically, the buffer tank pump 1 is connected to the first transfer pump 2 via a naphtha output pipeline), enabling the input of naphtha to the first transfer pump 2. The first transfer pump 2 is also connected to a feed heat exchanger 3, enabling the input of naphtha to the feed heat exchanger 3. The feed heat exchanger 3 is also connected to a stabilization tower 4 (specifically, the feed heat exchanger 3 is connected to the stabilization tower 4 via a liquid input transmission pipeline, enabling the input of naphtha to the stabilization tower 4; the feed heat exchanger 3 is also connected to the bottom of the stabilization tower 4 via a liquid recovery pipeline, enabling the acquisition of high-temperature liquid, which is then used to heat the naphtha). The feed heat exchanger 3 is also connected to a cooler 5, which cools the high-temperature liquid. The stabilizing tower 4 is also connected to the reboiler 6 (specifically, the reboiler 6 is equipped with heat source pipeline 1 and heat source pipeline 2; the stabilizing tower 4 is equipped with an output naphtha interface and an input naphtha interface; the output naphtha interface is connected to heat source pipeline 1; and heat source pipeline 2 is connected to the input naphtha interface). The reboiler 6 is connected to the asphalt secondary oil transmission device 12 (specifically, the reboiler 6 is connected to the asphalt secondary oil transmission device 12 via a heat source input pipeline; and the reboiler 6 is connected to the secondary oil recovery device via a heat source output pipeline), thus achieving the heating of naphtha to release volatile organic compounds using high-temperature secondary oil. The stabilizing tower 4 is also connected to the air cooler 7, which achieves the condensable substances in the volatile organic compounds to solidify into liquid and to obtain non-condensable gases. The air cooler 7 is also connected to the reflux tank 9, which collects the condensable substances condensed into liquid and the non-condensable gases. Stabilizer 4 and reflux tank 9 are also connected to the second transfer pump 8, enabling the return of a preset portion of the solidified liquid to stabilizer 4. Reflux tank 9 is also connected to the second transfer pump 8, the asphalt three-top gas-liquid ring pump 10, and the heavy inferior oil device 11 (specifically, it is connected to the asphalt three-top gas-liquid ring pump 10 via a non-condensable gas output pipe; and to the heavy inferior oil device 11 via an oil output pipe), enabling the output of non-condensable gas to the asphalt three-top gas-liquid ring pump 10 and the output of a preset portion of the solidified liquid to the heavy inferior oil device 11.

[0046] In addition, this application also provides a method for treating volatile organic compounds in naphtha storage tanks, such as... Figure 2 As shown in the embodiments of this application, the method mainly includes the following steps:

[0047] Step 210: The naphtha in the naphtha storage device is fed into the buffer tank pump, pressurized by the first delivery pump, and fed into the feed heat exchanger for heating. After reaching the preset temperature value, the naphtha is fed into the stabilizer tower.

[0048] Step 220: Heat the naphtha in the stabilizer column through a reboiler to generate volatile organic compounds and non-volatile liquids.

[0049] It should be noted that the reboiler uses the high-temperature asphalt oil from the asphalt oil transfer device as its heat source.

[0050] Step 230: After the volatile organic compounds rise to the top of the stabilizer, they are condensed into liquid organic compounds by the air cooler and transferred to the reflux tank; based on the preset reflux flow rate, the external output is determined; the second transfer pump provides the transmission power to return the preset reflux flow rate of liquid organic compounds in the reflux tank to the buffer tank pump; the external output of liquid organic compounds in the reflux tank is transferred to the heavy and inferior oil unit.

[0051] Step 240: Obtain the output liquid volume. Obtain the output liquid volume from the bottom of the stabilizer and transfer it to the feed heat exchanger as a heat source for heating naphtha. Then transfer it to the cooler. After the liquid temperature is reduced to the preset minimum temperature by the cooler, it is output.

[0052] The technical solutions of this disclosure have been described in conjunction with the preceding embodiments. However, it will be readily understood by those skilled in the art that the scope of protection of this disclosure is not limited to these specific embodiments. Without departing from the technical principles of this disclosure, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this disclosure will fall within the scope of protection of this disclosure.

Claims

1. A device for treating volatile organic compounds in naphtha storage tanks, characterized in that, The device includes: The buffer tank pump is connected to the first transfer pump; the first transfer pump is also connected to the feed heat exchanger; the feed heat exchanger is also connected to the stabilizer and the cooler; the stabilizer is also connected to the reboiler, the air cooler, and the second transfer pump; the reboiler is connected to the asphalt constant oil transfer device; the air cooler is connected to the reflux tank; the reflux tank is also connected to the second transfer pump, the asphalt three-top gas gas-liquid ring pump, and the heavy and inferior oil device; the reflux tank is equipped with a non-condensable gas output pipeline and an oil output pipeline; the non-condensable gas output pipeline is connected to the asphalt three-top gas gas-liquid ring pump; and the oil output pipeline is connected to the heavy and inferior oil device.

2. The volatile organic compound treatment device for naphtha storage tanks according to claim 1, characterized in that, The buffer tank pump is equipped with a naphtha output pipeline; The buffer tank pump is connected to the first delivery pump, specifically including: The buffer tank pump is connected to the first delivery pump via a naphtha output pipeline.

3. The volatile organic compound treatment device for naphtha storage tanks according to claim 1, characterized in that, The stabilizer tower includes a top, body, and bottom; the feed heat exchanger is equipped with a liquid inlet transmission pipe and a liquid recovery pipe; The feed heat exchanger is connected to the stabilizer tower body via a liquid input transmission pipeline; The feed heat exchanger is connected to the bottom of the stabilizer tower via a liquid recovery pipe.

4. The volatile organic compound treatment device for naphtha storage tanks according to claim 1, characterized in that, The reflux tank is also equipped with a reflux flow control device and an external oil delivery control device.

5. The volatile organic compound treatment device for naphtha storage tanks according to claim 1, characterized in that, The reboiler is equipped with a heat source input pipe and a heat source output pipe; The reboiler is connected to the asphalt constant oil transmission device via a heat source input pipeline; The reboiler is connected to the atmospheric oil recovery unit via a heat source output pipeline.

6. The volatile organic compound treatment device for naphtha storage tanks according to claim 1, characterized in that, The reboiler is also equipped with heat source No. 1 pipe and heat source No. 2 pipe; the stabilizer is equipped with naphtha output interface and naphtha input interface; The naphtha output interface is connected to heat source No. 1 pipeline; Heat source No. 2 pipeline is connected to the naphtha input interface.

7. The volatile organic compound treatment device for naphtha storage tanks according to claim 1, characterized in that, The buffer tank pump is also connected to the naphtha storage unit.

8. The volatile organic compound treatment device for naphtha storage tanks according to claim 7, characterized in that, The buffer tank pump is also equipped with a naphtha input pipeline; The buffer tank pump is connected to the naphtha storage device via a naphtha input pipeline.

9. A method for treating volatile organic compounds (VOCs) in naphtha storage tanks, applied to the VOCs treatment device for naphtha storage tanks according to claim 1, characterized in that, The method includes: The naphtha in the naphtha storage device is fed into the buffer tank pump, pressurized by the first delivery pump, and fed into the feed heat exchanger for heating. After reaching the preset temperature value, the naphtha is fed into the stabilizer tower. The naphtha in the stabilizer is heated by a reboiler to generate volatile organic compounds and non-volatile liquids; wherein the reboiler uses the asphalt secondary oil transferred from the asphalt secondary oil transfer device as a heat source. After the volatile organic compounds rise to the top of the stabilizer, they are condensed into liquid organic compounds by the air cooler and transferred to the reflux tank. Based on the preset reflux flow rate, the external output is determined. The second transfer pump provides the transmission power to return the preset reflux flow rate of liquid organic compounds in the reflux tank to the buffer tank pump. The external output of liquid organic compounds in the reflux tank is transferred to the heavy and inferior oil unit. The output liquid volume is obtained from the bottom of the stabilizer and transferred to the feed heat exchanger as a heat source for heating naphtha. Then it is transferred to the cooler. After the cooler reduces the liquid temperature to the preset minimum temperature, it is output.

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