Liquid removal device, vaporizer, and vaporizer liquid removal method

Abstract

The present application relates to the field of petroleum chemical industry, and discloses a liquid removal device, a vaporizer and a vaporizer liquid removal method. The liquid removal device comprises a buffer tank, a flare and a liquid collecting tank. The upper part of the buffer tank is provided with a liquid inlet, the top is provided with a vent port, and the lower part is provided with a liquid removal port. The liquid inlet is used for being communicated with the outlet of the vaporizer tank to buffer the fluid from the vaporizer tank. The flare has an air inlet, which is communicated with the vent port to treat the gas discharged from the buffer tank. The liquid collecting tank has a liquid collecting port, which is communicated with the liquid removal port to collect the liquid discharged from the buffer tank. The buffer tank provided by the present application buffers the fluid discharged from the vaporizer tank, the flare treats the gas discharged from the buffer tank, and the liquid collecting tank collects the liquid removed from the buffer tank. The liquid removal device enables the vaporizer to remove ammonia liquid in a closed buffer tank, thereby avoiding the problem that the fuel gas is prone to leakage when the existing vaporizer removes ammonia liquid.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, and more specifically to a dehydration device, a vaporizer, and a dehydration method using a vaporizer. Background Technology

[0002] Liquefied petroleum gas (LPG) is a key fuel choice for industrial use. The first step in using LPG as fuel is to vaporize it using a vaporizer. LPG typically contains liquid ammonia, which enters the vaporizer along with the LPG. If the ammonia is not removed from the vaporizer in a timely manner, it can easily mix with the fuel gas and be discharged from the vaporizer's outlet. This can affect the combustion of the fuel gas and, in severe cases, even disrupt the stable and safe operation of production.

[0003] Existing vaporizers used for liquefied petroleum gas (LPG) typically have a liquid discharge port at the bottom of the vaporization tank to drain the ammonia liquid into a waste tank. However, during the liquid discharge process, there is a risk of large-scale LPG leakage, which could lead to fire or explosion. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem of liquefied petroleum gas leakage during the removal of ammonia liquid from the vaporizer in the prior art, and to provide a liquid removal device, a vaporizer liquid removal method, and a vaporizer. This liquid removal device can achieve safe removal of ammonia liquid from the vaporizer.

[0005] To achieve the above objectives, the present invention provides a dehydration device, the dehydration device comprising:

[0006] A buffer tank is provided with a liquid inlet at the top, a vent at the top, and a liquid removal port at the bottom. The liquid inlet is used to communicate with the outlet at the bottom of the vaporization tank to buffer the fluid from the vaporization tank.

[0007] A flare, the flare having an air inlet connected to the vent outlet to handle gas discharged from the buffer tank; and

[0008] A liquid collection tank having a liquid collection port connected to the liquid removal port to collect liquid flowing out of the buffer tank.

[0009] Preferably, the dehydration device further includes at least one of a liquid inlet valve, a vent valve, and a dehydration valve;

[0010] The liquid inlet valve is installed on the liquid inlet pipe connecting the liquid inlet and the outlet; the vent valve is installed on the vent pipe connecting the vent and the air inlet; and the desliming valve is installed on the desliming pipe connecting the desliming port and the liquid collection port.

[0011] Preferably, the dehydration device further includes a monitoring component for monitoring at least one of the pressure and liquid level within the buffer tank.

[0012] Preferably, the monitoring component includes at least one of a remote pressure gauge and a field pressure gauge;

[0013] Preferably, the monitoring component includes at least one of a remote level gauge and a glass plate level gauge.

[0014] A second aspect of the present invention provides a vaporizer, the vaporizer comprising:

[0015] A vaporization tank, configured for vaporizing liquefied petroleum gas, wherein the vaporization tank has an outlet at its bottom; and

[0016] The above-mentioned liquid removal device has its inlet and outlet connected.

[0017] A third aspect of the present invention provides a method for dehydrating a vaporizer, using the vaporizer described above for dehydration. The dehydration device further includes a liquid inlet valve, a vent valve, and a dehydration valve. The liquid inlet valve is disposed on a liquid inlet pipe connecting the liquid inlet and the outlet. The vent valve is disposed on a vent pipe connecting the vent outlet and the air inlet. The dehydration valve is disposed on a dehydration pipe connecting the dehydration outlet and the liquid collection outlet. The method includes:

[0018] S1. Open the liquid inlet valve and close the vent valve and the liquid removal valve to allow the liquid in the vaporization tank to enter the buffer tank;

[0019] S2. Close the inlet valve and the outlet valve, and open the vent valve to allow the gas in the buffer tank to enter the flare.

[0020] S3. Close the inlet valve and the vent valve, and open the drain valve to allow the liquid in the buffer tank to enter the collection tank.

[0021] Preferably, step S1 includes opening the inlet valve when the liquid level in the vaporization tank is higher than or equal to the first target liquid level and the liquid level in the buffer tank is lower than the second target liquid level, and then closing the inlet valve.

[0022] Preferably, the ratio α1 of the first target liquid level to the height of the vaporization tank satisfies 60% ≤ α1 ≤ 80%;

[0023] Preferably, the ratio α2 of the second target liquid level to the height of the buffer tank satisfies 40% ≤ α2 ≤ 60%.

[0024] Preferably, step S2 includes opening the vent valve when the inlet valve is closed and the pressure in the buffer tank is higher than or equal to the target pressure, until the pressure in the buffer tank is lower than the target pressure, and then closing the vent valve.

[0025] Preferably, step S3 includes opening the dehydration valve when the inlet valve is closed and the liquid level in the buffer tank is higher than or equal to the third target liquid level, and closing the dehydration valve after the liquid level in the buffer tank is lower than the third target liquid level.

[0026] Preferably, the ratio α3 of the third target liquid level to the height of the buffer tank satisfies α3≤10%;

[0027] Preferably, the target pressure P satisfies P≤0.25MPa.

[0028] Through the above technical solution, the dehydration device provided by this invention uses a buffer tank to buffer the fluid discharged from the vaporizer, preventing the ammonia liquid mixed with fuel gas discharged from the vaporizer from being directly introduced into the waste liquid tank, thus avoiding the dangers of fuel gas being discharged into the atmosphere, polluting the environment, and causing fires and explosions. The inlet of the buffer tank is connected to the outlet of the vaporizer, allowing fluid to enter the buffer tank; the vent is connected to the air inlet of the flare, allowing the treatment of fuel gas inside the buffer tank; and the dehydration port is connected to the collection port of the collection tank, allowing the recovery of ammonia liquid. The dehydration device enables the vaporizer to remove ammonia liquid within a sealed buffer tank, avoiding the problem of liquefied gas leakage that easily occurs during ammonia removal in existing vaporizers. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a vaporizer provided by the present invention.

[0030] Explanation of reference numerals in the attached figures

[0031] 1-Vaporizer; 10-Liquid removal device; 20-Vaporizing tank; 20a-Outlet;

[0032] 11-Buffer tank; 12-Flame; 13-Collection tank; 14-Inlet pipe; 15-Vent pipe; 16-Desiccant pipe; 17-Monitoring components;

[0033] 11a - Liquid inlet; 11b - Vent port; 11c - Liquid stripping port; 12a - Air inlet; 13a - Liquid collection port;

[0034] 141-Inlet valve; 151-Vent valve; 161-Drain valve; 171-Remote level gauge; 172-Glass plate level gauge; 173-Remote pressure gauge; 174-Field pressure gauge. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0038] Please see Figure 1 , Figure 1 This is a schematic diagram of a vaporizer provided by the present invention. The present invention provides a liquid removal device 10, which includes a buffer tank 11, a flare 12, and a liquid collection tank 13. The buffer tank 11 has an inlet 11a at its upper part, a vent 11b at its top, and a liquid removal port 11c at its lower part. The inlet 11a communicates with the outlet 20a at the bottom of the vaporizer 20 to buffer the fluid from the vaporizer 20. The flare 12 has an inlet 12a that communicates with the vent 11b to process the gas discharged from the buffer tank 11. The liquid collection tank 13 has a collection port 13a that communicates with the liquid removal port 11c to collect the liquid flowing out of the buffer tank 11.

[0039] It is understood that the liquid removal device 10 provided by the present invention is used to remove liquid from the vaporization tank 20 of the vaporizer 1. Specifically, the liquid removal device 10 provided by the present invention can be applied in the petrochemical field, specifically to remove ammonia accumulated in the vaporization tank of a liquefied petroleum gas vaporizer. The vaporizer can be, but is not limited to, a hot water heated vaporizer, a steam heated vaporizer, an electrically heated vaporizer, a tubular vaporizer, or a coiled vaporizer. The above are examples of application scenarios for the liquid removal device 10 provided by the present invention and should not be construed as limiting the application scenarios of the liquid removal device 10 provided by the present invention.

[0040] The buffer tank 11 has a liquid inlet 11a at the top, a vent 11b at the top, and a drain outlet 11c at the bottom. It is understood that the liquid inlet 11a can be located at the top of the buffer tank 11 or on the upper part of its side wall. Similarly, it is understood that the drain outlet 11c can be located at the bottom of the buffer tank 11 or on the lower part of its side wall.

[0041] To more clearly illustrate the technical effects of this invention, related technologies are described here. In related technologies, vaporizers used for liquefied petroleum gas (LPG) vaporization typically have a liquid discharge port at the bottom of the vaporization tank. When the liquid level in the vaporization tank exceeds the safe level, operation and maintenance personnel open the valve at the liquid discharge port to drain the liquid from the vaporization tank into a waste liquid tank. However, during the liquid discharge process, a large amount of fuel gas is simultaneously collected in the vaporization tank. This fuel gas can easily become mixed with the liquid and leak out through the liquid discharge port, posing a significant risk of fuel gas leakage. Leaked fuel gas poses a serious fire and explosion hazard, affecting the safety of personnel and equipment.

[0042] Meanwhile, the fuel gas discharged from the deliquescence port is difficult to recover and treat, which can pollute the production environment and affect the health of operation and maintenance personnel. In addition, the quantitative accuracy of the deliquescence volume in the related technologies is low, and it relies heavily on human experience. This can easily lead to untimely deliquescence in the deliquescence tank, causing liquid to accumulate continuously. When the liquid level in the deliquescence tank is too high, the liquid can easily enter the downstream furnace for combustion along with the fuel gas, affecting the safe and stable operation of production.

[0043] When the liquid removal device 10 provided by the present invention is applied to remove liquid from the vaporization tank 20, the inlet 11a of the buffer tank 11 is connected to the outlet 20a of the vaporization tank 20. The liquid in the vaporization tank 20, mixed with some of the fuel gas in the vaporization tank 20, enters the buffer tank 11 from the outlet 20a via the inlet pipe 14 and the inlet 11a. The fluid entering the buffer tank 11 from the inlet 11a is buffered in the buffer tank 11, and the fuel gas and liquid are separated into layers under the action of gravity. The fuel gas enters the flare 12 from the vent 11b at the top of the buffer tank 11 via the vent pipe 15 and the air inlet 12a of the flare 12, realizing the recovery of fuel gas. The liquid enters the collection tank 13 from the liquid removal port 11c at the bottom of the buffer tank 11 via the liquid removal pipe 16 and the collection port 13a of the collection tank 13, realizing the collection of liquid.

[0044] It is understood that the buffer tank 11 in this invention buffers the fluid discharged from the vaporization tank 20, preventing the liquid mixed with fuel gas discharged from the vaporization tank 20 from being directly introduced into the waste liquid tank, thus avoiding the dangers of fuel gas being discharged into the atmosphere, polluting the environment, and causing fires and explosions. The liquid removal device 10 provided by this invention enables the vaporization tank 20 to achieve liquid removal within the sealed buffer tank 11, avoiding the problem of fuel gas leakage that easily occurs when removing liquid in existing vaporization tanks 20.

[0045] It is understood that the flare 12 in this invention is located downstream of the buffer tank 11, and is configured to collect and process the fuel gas discharged from the vent 11b of the buffer tank 11, preventing fuel gas leakage into the production environment, which could affect the health of personnel in the production environment and cause safety hazards such as fires and explosions. The deliquescence device 10 provided by this invention enables the vaporization tank 20 to transport the fuel gas entrained in the liquid to the flare 12 for fuel gas treatment, solving the problem that the fuel gas discharged from the existing vaporization tank 20 is difficult to treat.

[0046] It is understood that the liquid collection tank 13 in this invention is also located downstream of the buffer tank 11, and is configured to collect the liquid flowing out of the dewatering port 11c of the buffer tank 11. The liquid collection tank 13 realizes the collection and reuse of the liquid removed by the vaporization tank 20; thus, the dewatering device 10 provided by this invention enables the vaporization tank 20 to transport the removed liquid to the liquid collection tank 13 for liquid collection.

[0047] Please refer to it again. Figure 1 In some preferred embodiments, the dehydration device 10 further includes at least one of a liquid inlet valve 141, a vent valve 151, and a dehydration valve 161. The liquid inlet valve 141 is disposed on a liquid inlet pipe 14 connecting the liquid inlet 11a and the outlet 20a; the vent valve 151 is disposed on a vent pipe 15 connecting the vent outlet 11b and the air inlet 12a; and the dehydration valve 161 is disposed on a dehydration pipe 16 connecting the dehydration outlet 11c and the liquid collection outlet 13a.

[0048] It is understood that the inlet valve 141, the vent valve 151, and the dehydration valve 161 can respectively control the opening and closing of the inlet pipeline 14, the vent pipeline 15, and the dehydration pipeline 16. In some preferred embodiments, the dehydration device 10 includes the inlet valve 141, the vent valve 151, and the dehydration valve 161, so that the dehydration device 10 can simultaneously control the start and stop of the buffer tank 11 being fed liquid from the vaporization tank 20, the start and stop of the venting from the vent port 11b, and the start and stop of the dehydration from the dehydration port 11c.

[0049] In some optional embodiments, one or more of the inlet valve 141, the vent valve 151, and the dehydration valve 161 are opening-regulating valves. This allows the inlet valve 141, the vent valve 151, and the dehydration valve 161 to also control the fluid flow rate within the inlet pipeline 14, the vent pipeline 15, and the dehydration pipeline 16. This avoids excessive fluid flow rates within the inlet pipeline 14, the vent pipeline 15, and the dehydration pipeline 16, which could cause safety hazards, and also avoids excessively low fluid flow rates within the inlet pipeline 14, the vent pipeline 15, and the dehydration pipeline 16, which could lead to low dehydration efficiency of the dehydration device 10. This makes the dehydration device 10 provided by the present invention safer and more stable. Preferably, the inlet valve 141, the vent valve 151, and the dehydration valve 161 are all opening-regulating valves.

[0050] In some preferred embodiments, one or more of the inlet valve 141, the vent valve 151, and the dehydration valve 161 are solenoid valves; furthermore, one or more of the inlet valve 141, the vent valve 151, and the dehydration valve 161 are configured to be remotely controlled. This configuration allows operators to remotely control the adjustment of the inlet valve 141, the vent valve 151, and the dehydration valve 161, increasing the safety of equipment use. More preferably, the inlet valve 141, the vent valve 151, and the dehydration valve 161 are also interconnected with a host computer control system to achieve automatic valve control. Preferably, the inlet valve 141, the vent valve 151, and the dehydration valve 161 are all solenoid valves.

[0051] Please refer to it again. Figure 1 In some preferred embodiments, the dehydration device 10 further includes a monitoring component 17 for monitoring at least one of the pressure and liquid level within the buffer tank 11.

[0052] It is understood that the monitoring component 17 can realize real-time monitoring of the pressure and liquid level of the buffer tank 11, promptly detect situations where the pressure of the buffer tank 11 is too high or the liquid level is too high, and promptly remove the liquid in the buffer tank 11 or vent the fuel gas in the buffer tank 11 to avoid the danger of liquid and fuel gas leakage caused by damage to the buffer tank 11.

[0053] In some preferred embodiments, the monitoring device may also be associated with at least one of the inlet valve 141, the vent valve 151, and the dehydration valve 161. When the monitoring component 17 detects that the liquid level in the buffer tank 11 is too high, it instructs the inlet valve 141 to close, or instructs the dehydration valve 161 to close; when the monitoring component 17 detects that the pressure in the buffer tank 11 is too high, it instructs the inlet valve 141 to close, or instructs the vent valve 151 to close; when the monitoring component 17 detects that both the pressure and liquid level in the buffer tank 11 are at a safe and low level, it instructs the inlet valve 141 to open to dehydrate the vaporization tank 20.

[0054] In some optional embodiments, the monitoring component 17 can monitor not only the pressure and liquid level in the buffer tank 11, but also the temperature parameter in the buffer tank 11, thereby enabling monitoring of the temperature in the buffer tank 11 and timely detection of excessively high temperatures in the buffer tank 11, so as to reduce the safety hazards caused by excessively high liquid temperature when the dehydration device 10 dehydrates the vaporization tank 20.

[0055] Please refer to it again. Figure 1 In some preferred embodiments, the monitoring component 17 includes at least one of a remote pressure gauge 173 and a field pressure gauge 174.

[0056] It is understood that the remote pressure gauge 173 and the local pressure gauge 174 can monitor the pressure inside the buffer tank 11. In some preferred embodiments, the monitoring component 17 includes the remote pressure gauge 173 and the local pressure gauge 174, so that the dehydration device 10 can simultaneously monitor the pressure of the buffer tank 11 both locally and remotely.

[0057] The on-site pressure gauge 174 allows monitoring personnel to conveniently and intuitively obtain pressure data of the buffer tank 11 on-site. When excessive pressure is detected in the buffer tank 11, the vent valve 151 is opened promptly to release the fuel gas in the buffer tank 11, reducing the pressure and thus avoiding safety hazards caused by excessive pressure. The on-site pressure gauge 174 improves the efficiency of on-site control of the buffer tank 11.

[0058] The remote pressure gauge 173 enables unattended remote pressure monitoring of the buffer tank 11. Preferably, the remote pressure gauge 173 can upload the measured pressure data to the automatic control system, which guides the opening and closing of the inlet valve 141, the vent valve 151, and the dehydration valve 161 based on the real-time measured pressure data, thereby achieving unattended remote dehydration of the vaporization tank 20. The remote pressure gauge 173 can significantly reduce manual operation during the production process and lower the risk of injury to operators.

[0059] Please refer to it again. Figure 1 In some preferred embodiments, the monitoring component 17 includes at least one of a remote level gauge 171 and a glass plate level gauge 172.

[0060] It is understood that the remote level gauge 171 and the glass plate level gauge 172 can monitor the liquid level inside the buffer tank 11. In some preferred embodiments, the monitoring component 17 includes the remote level gauge 171 and the glass plate level gauge 172, so that the liquid removal device 10 can simultaneously monitor the liquid level of the buffer tank 11 both on-site and remotely.

[0061] The glass plate level gauge 172 allows monitoring personnel to conveniently and intuitively obtain the liquid level data of the buffer tank 11 on-site. When the liquid level in the buffer tank 11 is detected to be too high, the inlet valve 141 is promptly closed to stop the liquid from entering the vaporization tank 20, and the drain valve 161 is promptly opened to remove liquid from the buffer tank 11, thereby lowering the liquid level in the buffer tank 11 and avoiding safety hazards caused by an excessively high liquid level. The level gauge improves the efficiency of on-site control of the buffer tank 11.

[0062] The remote level gauge 171 enables unattended remote level monitoring of the buffer tank 11. Preferably, the remote level gauge 171 uploads the measured level data to the automatic control system, which then guides the opening and closing of the inlet valve 141, the vent valve 151, and the dehydration valve 161 based on the real-time measured level data, thus achieving unattended remote dehydration of the vaporization tank 20. The remote level gauge 171 can significantly reduce manual operation during the production process and lower the risk of injury to operators.

[0063] The present invention provides a vaporizer 1, which includes a vaporization tank 20 and the aforementioned dehydration device 10. The vaporization tank 20 is configured to vaporize liquefied petroleum gas, and an outlet 20a is provided at the bottom of the vaporization tank 20. The inlet 11a of the dehydration device 10 is connected to the outlet 20a.

[0064] It is understood that the vaporizer 1 provided by this invention is used for vaporizing liquefied petroleum gas (LPG). Specifically, the vaporizer 1 provided by this invention can be applied in the petrochemical field, specifically for vaporizing liquefied fuel gas. The vaporizer 1 can be, but is not limited to, a hot water-heated vaporizer, a steam-heated vaporizer, an electrically heated vaporizer, a tubular vaporizer, or a coil vaporizer. The above are examples of types of vaporizer 1 provided by this invention and should not be construed as limiting the types of vaporizer 1 provided by this invention.

[0065] It is understood that the vaporization tank 20 is configured as the vaporization site for liquefied petroleum gas (LPG), and the deliquencing device 10 is configured to remove the liquid accumulated in the vaporization tank 20. Specifically, in some embodiments, the vaporization tank 20 is an LPG vaporization tank 20, and the deliquencing device 10 is configured to remove ammonia from the LPG vaporization tank 20. Typically, LPG contains ammonia. When the vaporizer 1 vaporizes the LPG, ammonia accumulates in the vaporization tank 20. If the ammonia is not removed in time, it will enter the downstream furnace for combustion along with the fuel gas, affecting the safe and stable operation of production.

[0066] When the vaporizer 1 provided by this invention is applied to vaporize liquefied petroleum gas, the liquefied petroleum gas mixed with ammonia enters the liquefaction tank from the inlet of the vaporization tank 20. The ammonia in the liquefaction tank can flow from the outlet 20a at the bottom of the liquefaction tank to the buffer tank 11 of the dewatering device 10 for buffering. The fuel gas and liquid are separated into layers under the action of gravity. The fuel gas enters the flare 12 from the vent 11b at the top of the buffer tank 11 via the vent pipe 15 and the air inlet 12a of the flare 12 to realize the recovery of fuel gas. The liquid enters the collection tank 13 from the dewatering port 11c at the bottom of the buffer tank 11 via the dewatering pipe 16 and the collection port 13a of the collection tank 13 to realize the collection of liquid.

[0067] Please refer to it again. Figure 1The third aspect of the present invention provides a vaporizer dehydration method, using the vaporizer 1 described above for dehydration. The dehydration device 10 further includes an inlet valve 141, a vent valve 151, and a dehydration valve 161. The inlet valve 141 is disposed on an inlet pipe 14 connecting the inlet port 11a and the outlet port 20a. The vent valve 151 is disposed on a vent pipe 15 connecting the vent port 11b and the air inlet port 12a. The dehydration valve 161 is disposed on a dehydration pipe 16 connecting the dehydration port 11c and the liquid collection port 13a. The method includes: S1, opening the inlet valve 141 and closing the vent valve 151 and the dehydration valve 161 to allow the liquid in the vaporization tank 20 to enter the buffer tank 11; S2, closing the inlet valve 141 and the dehydration valve 161 and opening the vent valve 151 to allow the gas in the buffer tank 11 to enter the flare 12; S3, closing the inlet valve 141 and the vent valve 151 and opening the dehydration valve 161 to allow the liquid in the buffer tank 11 to enter the collection tank 13.

[0068] It is understood that when using the vaporizer deliquescence method provided by this invention to deliquulate the vaporizer 20, firstly, the deliquescence valve 161 and the vent valve 151 are closed, and the liquid inlet valve 141 is opened. The liquid in the vaporizer 20, mixed with some fuel gas, flows into the buffer tank 11 from the outlet 20a, the liquid inlet pipe 14, and the liquid inlet 11a, and the buffer tank 11 is in the liquid inlet state. At this time, the vaporizer 20 and the buffer tank 11 form a sealed whole because the deliquescence valve 161 and the vent valve 151 are in the closed state, thus avoiding fuel gas leakage during the liquid inlet process of the buffer tank 11.

[0069] Next, the inlet valve 141 and the dehydration valve 161 are closed, and the vent valve 151 is opened. Gas in the buffer tank 11 flows into the flare 12 through the vent port 11b, the vent pipe 15, and the inlet port 12a, putting the buffer tank 11 in a vented state. At this time, the vaporization tank 20 is sealed due to the closed inlet valve 141. Finally, the vent valve 151 and the dehydration valve 161 are closed, and the dehydration valve 161 is opened. Liquid in the buffer tank 11 flows into the collection tank 13 through the dehydration port 11c, the dehydration pipe 16, and the collection port 13a, putting the buffer tank 11 in a dehydrated state. At this time, the vaporization tank 20 is sealed due to the closed inlet valve 141.

[0070] Therefore, the vaporizer deliquescence method provided by the present invention can ensure that the vaporizer 20 is always in a sealed state during the liquid removal process, or in a sealed state together with the buffer tank 11, thus avoiding the safety hazards caused by the liquid to be removed and fuel gas being mixed and discharged into the production environment when the existing vaporizer 20 removes liquid.

[0071] It is understandable that the pressure inside the buffer tank 11 is relatively high when liquid removal and fuel gas venting are not performed. Simultaneously opening the liquid removal valve 161 and the venting valve 151 at this time will reduce the airtightness of the buffer tank 11. This can easily cause some of the fuel gas inside the buffer tank 11 to mix with the liquid under the pressure of the buffer tank 11 and flow out through the liquid collection port 13a to the liquid collection tank 13. This fuel gas accumulates in the liquid collection tank 13, causing excessive pressure and creating a safety hazard. Furthermore, it can easily cause some of the liquid inside the buffer tank 11 to be drawn into the venting pipe 15, entering the flare 12 along with the fuel gas and causing an explosion or other potential hazards.

[0072] Based on the above problems, the vaporizer deliquescence method provided by this invention involves venting the fuel gas in the buffer tank 11 after liquid inlet is completed, followed by liquid removal. Under gravity, the liquid in the buffer tank 11 is at the bottom, and the fuel gas is at the top. Opening the vent valve 151 allows the fuel gas in the buffer tank 11 to be discharged under pressure from the vent port 11b, the vent pipe 15, and the inlet 12a to the flare 12. After the fuel gas is discharged and the pressure in the buffer tank 11 decreases, the vent valve 151 is closed and the deliquescence valve 161 is opened. The remaining fuel gas in the buffer tank 11, due to the lower pressure within the buffer tank 11, is less likely to flow into the collection tank 13 with the liquid, thus ensuring the safety of the production environment and preventing the mixture of fuel gas and deliquescent liquid from flowing into the environment and causing dangers such as fires.

[0073] Please refer to it again. Figure 1 In some preferred embodiments, S1 includes opening the inlet valve 141 when the liquid level in the vaporization tank 20 is higher than or equal to the first target liquid level and the liquid level in the buffer tank 11 is lower than the second target liquid level, until the liquid level in the buffer tank 11 is higher than or equal to the second target liquid level, and then closing the inlet valve 141.

[0074] It is understood that in the above embodiment, the liquid inlet valve 141 is adjusted according to the liquid level of the vaporization tank 20 and the liquid level of the buffer tank 11. This allows the vaporization tank 20 to release liquid in a timely manner, preventing excessive liquid accumulation in the vaporization tank 20 from entering the furnace with the fuel gas and causing a safety hazard; at the same time, it also prevents excessive liquid in the buffer tank 11 from entering the flare 12 with the fuel gas under pressure and causing a safety hazard.

[0075] In some preferred embodiments, the dehydration device 10 includes a monitoring component 17 that can monitor the liquid level in the buffer tank 11. More preferably, the vaporization tank 20 used by the dehydration device 10 is equipped with a liquid level testing device for monitoring the liquid level in the vaporization tank 20. More preferably, the inlet valve 141 is a solenoid valve, and the monitoring component 17 and the liquid level testing device are interconnected with the inlet valve 141. Based on the measured liquid level parameters of the vaporization tank 20 and the buffer tank 11, the dehydration method of the vaporizer 1 provided in the above embodiments is used to instruct the inlet valve 141 to open and close.

[0076] In some preferred embodiments, the ratio α1 of the first target liquid level to the height of the vaporization tank 20 satisfies 60% ≤ α1 ≤ 80%. In some preferred embodiments, the ratio α2 of the second target liquid level to the height of the buffer tank 11 satisfies 40% ≤ α2 ≤ 60%.

[0077] Understandably, if the first target liquid level is set too high, the liquid in the vaporization tank 20 may not be removed in time. The liquid in the upper layer of the vaporization tank 20 may enter the furnace downstream of the vaporization tank 20 with the fuel gas and burn, causing safety hazards such as fire and explosion. At the same time, if the first target liquid level is set too low, the inlet valve 141 may open frequently, causing excessive fuel gas to flow out with the liquid into the buffer tank 11 and be discharged into the flare 12; thereby reducing the utilization rate of liquefied gas and resulting in fuel gas waste.

[0078] In the above embodiments, the ratio α1 of the first target liquid level to the height of the vaporization tank 20 satisfies 60% ≤ α1 ≤ 80%, which can achieve both timely liquid removal from the vaporization tank 20 and ensuring the utilization rate of liquefied gas. More preferably, the ratio α1 of the first target liquid level to the height of the vaporization tank 20 is 70%, which further improves the balance between timely liquid removal from the vaporization tank 20 and ensuring the utilization rate of liquefied gas. It should be noted that the above are preferred embodiments of the first target liquid level provided by the present invention and should not be construed as limiting the first target liquid level provided by the present invention.

[0079] Understandably, if the second target liquid level is set too high, the liquid level in the buffer tank 11 may become too high. When the buffer tank 11 is vented, the liquid in the buffer tank 11 may be drawn into the vent pipe 15 along with the fuel gas and enter the flare 12 for combustion, causing a safety hazard. At the same time, if the second target liquid level is set too low, the dehydration efficiency of the dehydration device 10 may become too low, requiring the inlet valve 141 to be opened multiple times to remove the liquid level in the vaporization tank 20 below the first target liquid level. The multiple openings of the inlet valve 141 will also increase the amount of fuel gas flowing into the buffer tank 11, resulting in energy waste.

[0080] In the above embodiments, the ratio α2 of the second target liquid level to the height of the buffer tank 11 satisfies 40% ≤ α2 ≤ 60%, which can achieve a balance between ensuring the safety of the venting process of the buffer tank 11 and ensuring the utilization rate of liquefied gas. More preferably, the ratio α2 of the second target liquid level to the height of the buffer tank 11 is 50%, which further improves the balance between ensuring the safety of the venting process of the buffer tank 11 and ensuring the utilization rate of liquefied gas. It should be noted that the above are preferred embodiments of the second target liquid level provided by the present invention and should not be construed as limiting the second target liquid level provided by the present invention.

[0081] Please refer to it again. Figure 1 In some preferred embodiments, S2 includes opening the vent valve 151 when the inlet valve 141 is closed and the pressure in the buffer tank 11 is higher than or equal to the target pressure, until the pressure in the buffer tank 11 is lower than the target pressure, and then closing the vent valve 151.

[0082] It is understood that in the above embodiment, the vent valve 151 is adjusted according to the pressure of the vaporization tank 20. This ensures that the buffer tank 11 can be fully vented, preventing incomplete venting of the buffer tank 11 from causing fuel gas to mix with the liquid and be removed into the liquid collection tank 13, which could lead to excessive pressure in the liquid collection tank 13 and create a safety hazard.

[0083] In some preferred embodiments, the dehydration device 10 includes a monitoring component 17 that can monitor the pressure inside the buffer tank 11. More preferably, the vent valve 151 is a solenoid valve, and the monitoring component 17 is associated with the inlet valve 141, instructing the vent valve 151 to open and close based on the measured pressure parameters of the buffer tank 11 using the dehydration method of the vaporizer 1 provided in the above embodiments.

[0084] Please refer to it again. Figure 1In some preferred embodiments, S3 includes opening the dewatering valve 161 when the inlet valve 141 is closed and the liquid level in the buffer tank 11 is higher than or equal to the third target liquid level, and closing the dewatering valve 161 after the liquid level in the buffer tank 11 is lower than the third target liquid level.

[0085] It is understood that in the above embodiment, the dehydration valve 161 is adjusted according to the liquid level in the vaporization tank 20. This ensures that the liquid in the buffer tank 11 can be fully removed, avoiding insufficient removal of liquid from the buffer tank 11 from affecting the dehydration efficiency of the dehydration device 10.

[0086] In some preferred embodiments, the dehydration device 10 includes a monitoring component 17 that can monitor the liquid level in the buffer tank 11. More preferably, the dehydration valve 161 is a solenoid valve, and the monitoring component 17 is associated with the dehydration valve 161, instructing the dehydration valve 161 to open and close based on the measured liquid level parameters of the buffer tank 11 using the vaporizer 1 dehydration method provided in the above embodiments.

[0087] In some preferred embodiments, the ratio α3 of the third target liquid level to the height of the buffer tank 11 satisfies α3≤10%. In some preferred embodiments, the target pressure P satisfies P≤0.25MPa.

[0088] It is understandable that if the third target liquid level is set too high, the buffer tank 11 may not be completely dehydrated, and the inlet valve 141 may need to be opened multiple times to remove the liquid to be removed from the vaporization tank 20 to the buffer tank 11, resulting in a low dehydration efficiency of the buffer tank 11.

[0089] In the above embodiments, the ratio α3 of the third target liquid level to the height of the buffer tank 11 satisfies α3≤10%, which can sufficiently ensure the dewatering efficiency of the buffer tank 11. More preferably, the ratio α3 of the third target liquid level to the height of the buffer tank 11 is 5%, at which point the dewatering efficiency of the buffer tank 11 is even better. It should be noted that the above are preferred embodiments of the third target liquid level provided by the present invention, and should not be construed as limiting the third target liquid level provided by the present invention.

[0090] It is understandable that if the target pressure is set too high, the fuel gas in the buffer tank 11 will not be completely vented, and some fuel gas will be separated from the liquid and enter the liquid collection tank 13, where it will accumulate and affect the safe operation of the liquid removal device 10 and the vaporizer 1.

[0091] In the above embodiments, the target pressure P, which satisfies P≤0.25MPa, allows the fuel gas in the buffer tank 11 to be fully vented through the venting pipe 15. More preferably, the target pressure P is 0.1MPa, at which point the venting effect of the buffer tank 11 is even better. It should be noted that the above are preferred embodiments of the target pressure provided by the present invention and should not be construed as limiting the target pressure provided by the present invention.

[0092] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Those skilled in the art should understand that the above embodiments or implementations are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or implementations, or equivalent substitutions can be made to some technical features, without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments or implementations can be combined in any manner.

Claims

1. A liquid separation device (10), characterized in that, The dehydration device (10) includes: A buffer tank (11) is provided with an inlet (11a) at the top, a vent (11b) at the top, and a drain (11c) at the bottom. The inlet (11a) is used to communicate with the outlet (20a) at the bottom of the vaporization tank (20) to buffer the fluid from the vaporization tank (20). A torch (12) having an air inlet (12a) connected to the vent (11b) for handling gas discharged from the buffer tank (11); and A liquid collection tank (13) having a liquid collection port (13a) connected to the liquid removal port (11c) for collecting liquid flowing out of the buffer tank (11).

2. The dehydration device (10) according to claim 1, characterized in that, The dehydration device (10) further includes at least one of a liquid inlet valve (141), a vent valve (151), and a dehydration valve (161); The inlet valve (141) is installed on the inlet pipe (14) connecting the inlet port (11a) and the outlet port (20a); the vent valve (151) is installed on the vent pipe (15) connecting the vent port (11b) and the air inlet port (12a); and the desiccant valve (161) is installed on the desiccant pipe (16) connecting the desiccant port (11c) and the collection port (13a).

3. The dehydration device (10) according to claim 1 or 2, characterized in that, The desliming device (10) further includes a monitoring component (17) for monitoring at least one of the pressure and liquid level in the buffer tank (11).

4. The dehydration device (10) according to claim 3, characterized in that, The monitoring component (17) includes at least one of a remote pressure gauge (173) and a local pressure gauge (174); and / or The monitoring component (17) includes at least one of a remote level gauge (171) and a glass plate level gauge (172).

5. A vaporizer (1), characterized in that, The vaporizer (1) includes: A vaporization tank (20), the vaporization tank (20) being configured for vaporizing liquefied petroleum gas, the bottom of the vaporization tank (20) being provided with an outlet (20a); and According to any one of claims 1-4, the liquid removal device (10) has its inlet (11a) connected to its outlet (20a).

6. A method for deliquerating a vaporizer, characterized in that, Using the vaporizer (1) according to claim 5 for dehydration, the dehydration device (10) further includes an inlet valve (141), a vent valve (151), and a dehydration valve (161). The inlet valve (141) is disposed on an inlet pipe (14) connecting the inlet port (11a) and the outlet port (20a). The vent valve (151) is disposed on a vent pipe (15) connecting the vent port (11b) and the air inlet port (12a). The dehydration valve (161) is disposed on a dehydration pipe (16) connecting the dehydration port (11c) and the collection port (13a). The method includes: S1. Open the inlet valve (141) and close the vent valve (151) and the descaling valve (161) to allow the liquid in the vaporization tank (20) to enter the buffer tank (11); S2. Close the inlet valve (141) and the outlet valve (161) and open the vent valve (151) to allow the gas in the buffer tank (11) to enter the torch (12); S3. Close the inlet valve (141) and the vent valve (151), and open the drain valve (161) to allow the liquid in the buffer tank (11) to enter the collection tank (13).

7. The vaporizer deliquescence method according to claim 6, characterized in that, S1 includes opening the inlet valve (141) when the liquid level in the vaporization tank (20) is higher than or equal to the first target liquid level and the liquid level in the buffer tank (11) is lower than the second target liquid level, until the liquid level in the buffer tank (11) is higher than or equal to the second target liquid level and then closing the inlet valve (141).

8. The vaporizer deliquescence method according to claim 7, characterized in that, The ratio α1 of the first target liquid level to the height of the vaporization tank satisfies 60% ≤ α1 ≤ 80%; and / or The ratio α2 of the second target liquid level to the height of the buffer tank satisfies 40% ≤ α2 ≤ 60%.

9. The vaporizer deliquescence method according to any one of claims 6-8, characterized in that, S2 includes opening the vent valve (151) when the inlet valve (141) is closed and the pressure in the buffer tank (11) is higher than or equal to the target pressure, until the pressure in the buffer tank (11) is lower than the target pressure, and then closing the vent valve (151); and / or S3 includes opening the drain valve (161) when the inlet valve (141) is closed and the liquid level in the buffer tank (11) is higher than or equal to the third target liquid level, and closing the drain valve (161) after the liquid level in the buffer tank (11) is lower than the third target liquid level.

10. The vaporizer deliquescence method according to claim 9, characterized in that, The ratio α3 of the third target liquid level to the height of the buffer tank satisfies α3≤10%; and / or The target pressure P satisfies P≤0.25Mpa.

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