Device for reducing evaporation of material from methyl ethyl carbonate storage tank

Abstract

The utility model relates to a kind of methyl ethyl carbonate storage tank material volatilization device for reducing.Its technical scheme is: installing inner float in the inner chamber liquid upper portion of methyl ethyl carbonate storage tank, connecting first material pump and second material pump by pipeline at the outlet of methyl ethyl carbonate storage tank, connecting first return material branch pipeline and first external discharge pipeline at the output end of first material pump, connecting second return material branch pipeline and second external discharge pipeline at the output end of second material pump, nitrogen storage tank is equipped at the top of methyl ethyl carbonate storage tank, the outlet end of nitrogen storage tank is connected to the top of methyl ethyl carbonate storage tank by nitrogen main pipeline and first control valve, so that the top of methyl ethyl carbonate storage tank maintains micro-positive pressure environment.Its beneficial effect is: on the one hand, install inner float in fixed top storage tank, on the other hand, by being equipped with nitrogen sealing system, the combination application of these two technologies not only greatly reduces the volatilization amount of methyl ethyl carbonate, reduces material loss and environmental pollution, but also improves the safety of storage process.

Description

Technical Field

[0001] This utility model relates to the field of methyl ethyl carbonate storage technology, and in particular to a device for reducing the volatilization of materials in methyl ethyl carbonate storage tanks. Background Technology

[0002] Ethyl methyl carbonate (EMC) has a low boiling point, approximately 61–63°C, and a high saturated vapor pressure at room temperature, causing liquid molecules to continuously escape into the gas phase. This characteristic makes it evaporate rapidly in open or poorly sealed environments. Furthermore, EMC vapor mixes with air to form a flammable mixture (explosion limits LEL = 2.0%, UEL = 10.0%). Existing storage tanks generally use fixed-roof tanks, whose top space cannot effectively discharge accumulated flammable gases, making them highly susceptible to combustion and explosion accidents when exposed to static sparks or open flames. In particular, the evaporation rate is significantly accelerated by rising temperatures (following the Clausius-Clapeyron equation), making it especially dangerous in the high temperatures of summer. Furthermore, direct exhaust emissions mean that all exhaled gases are released directly into the atmosphere without any treatment. It is estimated that the annual emissions from a single storage tank can reach tens of tons, far exceeding the limits set by the "Standard for Unorganized Emissions of Volatile Organic Compounds" (GB 37822) (concentration at monitoring points around the plant perimeter ≤ 4 mg / m³). Ethyl methyl carbonate (EMC), as a photochemically active substance, participates in ozone formation reactions, exacerbating regional smog problems. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a device for reducing the volatilization of materials in methyl ethyl carbonate storage tanks. This device combines two technologies: firstly, an internal floating roof is installed inside the fixed-roof tank; secondly, a nitrogen sealing system is provided. The combined application of these two technologies not only significantly reduces the volatilization of methyl ethyl carbonate, thereby reducing material loss and environmental pollution, but also improves the safety of the storage process.

[0004] The present invention discloses a device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank. The technical solution includes: a methyl ethyl carbonate storage tank (1), a nitrogen storage tank (2), an internal floating plate (3), a methyl ethyl carbonate temporary storage tank (4), a volatile gas filter (5), an incinerator (6), a first feed pump (8), a second feed pump (9), a first return branch pipeline (10), a second return branch pipeline (11), a first external discharge pipeline (12), a second external discharge pipeline (13), a return main pipeline (14), and a feed pump (19). The outlet of the methyl ethyl carbonate temporary storage tank (4) is connected to the methyl ethyl carbonate storage tank (1) via the feed pump (19) and pipelines. An internal floating plate (3) is installed above the liquid in the inner cavity of the methyl ethyl carbonate storage tank (1). The outlet of the methyl ethyl carbonate storage tank (1) is connected to the first feed pump (8) and the second feed pump (9) via pipelines. The output end of the first feed pump (8) is connected to... Connect the first return branch line (10) and the first discharge line (12), and connect the second return branch line (11) and the second discharge line (13) to the output end of the second feed pump (9). The outer ends of the first return branch line (10) and the second return branch line (11) converge to the return main line (14) and are connected to the lower side of the methyl ethyl carbonate storage tank (1) through the return main line (14). The top of the methyl ethyl carbonate storage tank (1) is provided with a nitrogen storage tank (2). The outlet end of the nitrogen storage tank (2) is connected to the top of the methyl ethyl carbonate storage tank (1) through the nitrogen main line and the first control valve (a1) to maintain a slightly positive pressure environment at the top of the methyl ethyl carbonate storage tank (1). A volatile gas pipeline (22) and a breather valve (21) are also installed on the top of the methyl ethyl carbonate storage tank (1). The outer end of the volatile gas pipeline (22) is connected to the incinerator (6) through a volatile gas filter (5).

[0005] Preferably, the output end of the above-mentioned feed pump (19) is connected to the methyl ethyl carbonate storage tank (1) through the feed filter (7) and the second self-control valve (17), and the control end of the second self-control valve (17) is connected to the liquid level sensor (16) through the signal line.

[0006] Preferably, a third self-control valve (18) and a discharge filter (20) are installed on the pipeline at the outlet end of the methyl ethyl carbonate storage tank (1), and the control end of the third self-control valve (18) is connected to the control end of the second self-control valve (17) via a signal line.

[0007] Preferably, the liquid level observer (15) is connected to the outside of the methyl ethyl carbonate storage tank (1) via a pipeline.

[0008] Preferably, the first control valve (a1) and one side of the nitrogen main pipeline are connected to the second nitrogen pipeline. A first check valve (a2), a three-way valve (a3), and a second check valve (a4) are installed on the second nitrogen pipeline. The third outlet of the three-way valve (a3) ​​is connected to the volatile gas pipeline (22) through the pipeline and the fourth control valve (a5).

[0009] Preferably, the outer end of the aforementioned volatile gas pipeline (22) is connected to the volatile gas filter (5) via a fifth control valve (a6).

[0010] Preferably, the aforementioned inner floating plate (3) includes a floating plate body (3.1), a lower protruding ring (3.2), an arc-shaped top (3.3), an air storage chamber (3.4), and an air storage bag (3.5). The lower outer ring of the floating plate body (3.1) is provided with a lower protruding ring (3.2), and an arc-shaped top (3.3) is installed on the upper surface of the floating plate body (3.1). An air storage chamber (3.4) is formed between the arc-shaped top (3.3) and the upper surface of the floating plate body (3.1). Multiple air storage bags (3.5) are provided in the inner cavity of the floating plate body (3.1).

[0011] The beneficial effects of this invention are as follows: Firstly, by installing an internal floating roof inside the fixed-top storage tank, the internal floating roof is designed to rise and fall with changes in liquid level, closely adhering to the liquid surface to form a physical barrier. This significantly reduces the volume of the gas phase space inside the storage tank, decreases the contact area between methyl ethyl carbonate and air, and thus inhibits its volatilization. Secondly, this invention is equipped with a nitrogen sealing system. By injecting inert nitrogen gas into the storage tank, the nitrogen sealing system maintains a slightly positive pressure environment inside the tank, further isolating the direct contact between air and methyl ethyl carbonate, effectively preventing the escape of volatile substances. The combined application of the above two technologies not only greatly reduces the volatilization of methyl ethyl carbonate, reduces material loss and environmental pollution, but also improves the safety of the storage process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal floating roof structure; In the diagram above: 1. Methyl methyl carbonate storage tank; 2. Nitrogen storage tank; 3. Internal floating roof; 4. Methyl methyl carbonate temporary storage tank; 5. Volatile gas filter; 6. Incinerator; 7. Feed filter; 8. First feed pump; 9. Second feed pump; 10. First return branch line; 11. Second return branch line; 12. First external discharge line; 13. Second external discharge line; 14. Main return line; 15. Liquid level observer; 16. Liquid level sensor; 17. Second automatic control valve; 18. Third automatic control valve; 19. Feed pump; 20. Discharge filter; 21. Breathing valve; 22. Volatile gas line; 31. First control valve a1; 32. First one-way valve a2; 33. Three-way valve a3; 4. Second one-way valve a4; 5. Fourth control valve a5; 6. Fifth control valve a6; 3.1. Floating roof body; 3.2. Lower protruding ring; 3.3. Arc-shaped top; 3.4. Gas storage chamber; 3.5. Gas storage bladder. Detailed Implementation

[0013] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0014] Example 1, referring to Figure 1 and Figure 2 This utility model discloses a device for reducing the volatilization of materials in a methyl ethyl carbonate (MEC) storage tank, comprising an MEC storage tank 1, a nitrogen storage tank 2, an internal floating roof 3, a MEC temporary storage tank 4, a volatile gas filter 5, an incinerator 6, a first feed pump 8, a second feed pump 9, a first return branch pipeline 10, a second return branch pipeline 11, a first external discharge pipeline 12, a second external discharge pipeline 13, a return main pipeline 14, and a feed pump 19. The outlet of the MEC temporary storage tank 4 is connected to the MEC storage tank 1 via the feed pump 19 and pipelines. An internal floating roof 3 is installed on the upper part of the liquid in the inner cavity of the MEC storage tank 1. The outlet of the MEC storage tank 1 is connected to the first feed pump 8 and the second feed pump 9 via pipelines. The output end of the first feed pump 8 is connected to the first return branch pipeline. The feed branch line 10 and the first external discharge line 12 are connected to the second return branch line 11 and the second external discharge line 13 at the output end of the second feed pump 9. The outer ends of the first return branch line 10 and the second return branch line 11 converge to the return main line 14 and are connected to the lower side of the methyl ethyl carbonate storage tank 1 through the return main line 14. The top of the methyl ethyl carbonate storage tank 1 is equipped with a nitrogen storage tank 2. The outlet end of the nitrogen storage tank 2 is connected to the top of the methyl ethyl carbonate storage tank 1 through the nitrogen main line and the first control valve a1, so that the top of the methyl ethyl carbonate storage tank 1 maintains a slightly positive pressure environment. A volatile gas pipeline 22 and a breather valve 21 are also installed on the top of the methyl ethyl carbonate storage tank 1. The outer end of the volatile gas pipeline 22 is connected to the incinerator 6 through the volatile gas filter 5.

[0015] The output end of the feed pump 19 is connected to the methyl ethyl carbonate storage tank 1 via the feed filter 7 and the second automatic control valve 17. The control end of the second automatic control valve 17 is connected to the liquid level sensor 16 via a signal line.

[0016] A third automatic control valve 18 and a discharge filter 20 are installed on the pipeline at the outlet end of the methyl ethyl carbonate storage tank 1. The control end of the third automatic control valve 18 is connected to the control end of the second automatic control valve 17 via a signal line.

[0017] The first control valve a1 and one side of the nitrogen main line are connected to the second nitrogen line. The first check valve a2, the three-way valve a3 and the second check valve a4 are installed on the second nitrogen line. The third outlet of the three-way valve a3 is connected to the volatile gas line 22 through the pipeline and the fourth control valve a5.

[0018] The outer end of the aforementioned volatile gas pipeline 22 is connected to the volatile gas filter 5 via the fifth control valve a6.

[0019] Reference Figure 2 The inner floating plate 3 mentioned in this utility model includes a floating plate body 3.1, a lower protruding ring 3.2, an arc-shaped top 3.3, an air storage chamber 3.4, and an air storage bag 3.5. The lower protruding ring 3.2 is provided on the lower outer ring of the floating plate body 3.1, which can lower the overall center of gravity of the floating plate body 3.1 and make the entire inner floating plate more stable. An arc-shaped top 3.3 is installed on the upper surface of the floating plate body 3.1, and an air storage chamber 3.4 is formed between the arc-shaped top 3.3 and the upper surface of the floating plate body 3.1. Multiple air storage bags 3.5 are provided in the inner cavity of the floating plate body 3.1. Through the provided air storage chamber 3.4 and multiple air storage bags 3.5, it can be ensured that the floating plate body 3.1 can float on the upper part of the liquid.

[0020] In use, the methyl ethyl carbonate temporary storage tank 4 delivers methyl ethyl carbonate to the methyl ethyl carbonate storage tank 1 via the feed pump 19. Before entering the storage tank 1, the methyl ethyl carbonate is filtered by the feed filter 7. The liquid level in the storage tank 1 is controlled by the liquid level sensor 16. Furthermore, an inner floating plate 3 is installed above the liquid level, which rises and falls with changes in the liquid level, closely adhering to the liquid surface to form a physical barrier. This significantly reduces the volume of the gas phase space within the storage tank, minimizing the reaction between methyl ethyl carbonate and... The air contact area is increased, thus inhibiting its volatilization. In addition, the nitrogen sealing system maintains a slightly positive pressure environment inside the tank by injecting inert nitrogen gas into the tank, further isolating the direct contact between air and ethyl methyl carbonate, effectively preventing the escape of volatile substances. The discharge of ethyl methyl carbonate is achieved through the first feed pump 8 and the second feed pump 9, which can achieve simultaneous discharge of the two sets. In addition, ethyl methyl carbonate can also be pumped back into the ethyl methyl carbonate storage tank 1 through the first return branch line 10 and the second return branch line 11.

[0021] Example 2: A device for reducing the volatilization of methyl ethyl carbonate (MEC) storage tanks mentioned in this utility model includes an MEC storage tank 1, a nitrogen storage tank 2, an internal floating roof 3, a MEC temporary storage tank 4, a volatile gas filter 5, an incinerator 6, a first feed pump 8, a second feed pump 9, a first return branch pipeline 10, a second return branch pipeline 11, a first external discharge pipeline 12, a second external discharge pipeline 13, a return main pipeline 14, and a feed pump 19. The outlet of the MEC temporary storage tank 4 is connected to the MEC storage tank 1 via the feed pump 19 and pipelines. An internal floating roof 3 is installed on the upper part of the liquid in the inner cavity of the MEC storage tank 1. The outlet of the MEC storage tank 1 is connected to the first feed pump 8 and the second feed pump 9 via pipelines. The output end of the first feed pump 8 is connected to the second feed pump 9. A return branch line 10 and a first discharge line 12 are connected to a second return branch line 11 and a second discharge line 13 at the output end of a second feed pump 9. The outer ends of the first return branch line 10 and the second return branch line 11 converge to the main return line 14 and are connected to the lower side of the methyl ethyl carbonate storage tank 1 through the main return line 14. A nitrogen storage tank 2 is provided at the top of the methyl ethyl carbonate storage tank 1. The outlet end of the nitrogen storage tank 2 is connected to the top of the methyl ethyl carbonate storage tank 1 through the main nitrogen line and a first control valve a1 to maintain a slightly positive pressure environment at the top of the methyl ethyl carbonate storage tank 1. A volatile gas pipeline 22 and a breather valve 21 are also installed at the top of the methyl ethyl carbonate storage tank 1. The outer end of the volatile gas pipeline 22 is connected to the incinerator 6 through a volatile gas filter 5.

[0022] The difference from Example 1 is: The methyl ethyl carbonate storage tank 1 mentioned in this embodiment is connected to a liquid level observer 15 via a pipeline on its outside for easy observation of the liquid level.

[0023] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank, characterized in that: The system includes a methyl ethyl carbonate storage tank (1), a nitrogen storage tank (2), an internal floating roof (3), a methyl ethyl carbonate temporary storage tank (4), a volatile gas filter (5), an incinerator (6), a first feed pump (8), a second feed pump (9), a first return branch pipeline (10), a second return branch pipeline (11), a first external discharge pipeline (12), a second external discharge pipeline (13), a return main pipeline (14), and a feed pump (19). The outlet of the methyl ethyl carbonate temporary storage tank (4) is connected to the methyl ethyl carbonate storage tank (1) via the feed pump (19) and pipelines. An internal floating roof (3) is installed on the upper part of the liquid in the inner cavity of the methyl ethyl carbonate storage tank (1). The outlet of the methyl ethyl carbonate storage tank (1) is connected to the first feed pump (8) and the second feed pump (9) via pipelines. The output end of the first feed pump (8) is connected to the first return branch pipeline (10) and the first external discharge pipeline (13). The discharge pipeline (12) is connected to the second return branch pipeline (11) and the second external discharge pipeline (13) at the output end of the second feed pump (9). The outer ends of the first return branch pipeline (10) and the second return branch pipeline (11) converge to the return main pipeline (14) and are connected to the lower side of the methyl ethyl carbonate storage tank (1) through the return main pipeline (14). The top of the methyl ethyl carbonate storage tank (1) is provided with a nitrogen storage tank (2). The outlet end of the nitrogen storage tank (2) is connected to the top of the methyl ethyl carbonate storage tank (1) through the nitrogen main pipeline and the first control valve (a1) to maintain a slightly positive pressure environment at the top of the methyl ethyl carbonate storage tank (1). A volatile gas pipeline (22) and a breather valve (21) are also installed on the top of the methyl ethyl carbonate storage tank (1). The outer end of the volatile gas pipeline (22) is connected to the incinerator (6) through a volatile gas filter (5).

2. The device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank according to claim 1, characterized in that: The output end of the feed pump (19) is connected to the methyl ethyl carbonate storage tank (1) through the feed filter (7) and the second self-control valve (17), and the control end of the second self-control valve (17) is connected to the liquid level sensor (16) through the signal line.

3. The device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank according to claim 2, characterized in that: in A third self-control valve (18) and a discharge filter (20) are installed on the pipeline at the outlet end of the methyl ethyl carbonate storage tank (1). The control end of the third self-control valve (18) is connected to the control end of the second self-control valve (17) via a signal line.

4. The device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank according to claim 3, characterized in that: The outer side of the methyl ethyl carbonate storage tank (1) is connected to a liquid level observer (15) via a pipeline.

5. The device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank according to claim 3 or 4, characterized in that: The first control valve (a1) is connected in parallel with the second nitrogen pipeline on one side of the nitrogen main pipeline. A first check valve (a2), a three-way valve (a3), and a second check valve (a4) are installed on the second nitrogen pipeline. The third outlet of the three-way valve (a3) ​​is connected to the volatile gas pipeline (22) through the pipeline and the fourth control valve (a5).

6. The device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank according to claim 5, characterized in that: The outer end of the volatile gas pipeline (22) is connected to the volatile gas filter (5) via the fifth control valve (a6).

7. The device for reducing the volatilization of materials in a methyl ethyl carbonate storage tank according to claim 1, characterized in that: The inner floating plate (3) includes a floating plate body (3.1), a lower protruding ring (3.2), an arc-shaped top (3.3), an air storage chamber (3.4), and an air storage bag (3.5). The lower outer ring of the floating plate body (3.1) is provided with a lower protruding ring (3.2). An arc-shaped top (3.3) is installed on the upper surface of the floating plate body (3.1). An air storage chamber (3.4) is formed between the arc-shaped top (3.3) and the upper surface of the floating plate body (3.1). Multiple air storage bags (3.5) are provided in the inner cavity of the floating plate body (3.1).

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