CN114261644A - Port crude MDI storage and transportation system and method - Google Patents
Port crude MDI storage and transportation system and method Download PDFInfo
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Abstract
The invention relates to a port crude MDI storage and transportation system and a storage and transportation method, wherein the system comprises a transfer device, at least two crude MDI storage tanks, a liquid nitrogen storage tank, a loading platform and a heating assembly; the liquid nitrogen storage tank is communicated with the transfer device through a first pipeline and is communicated with the crude MDI storage tank through a second pipeline; the transfer device is communicated with the root of the crude MDI storage tank through a third pipeline, the crude MDI is conveyed to the crude MDI storage tank from the transfer device, the transfer device is also communicated with the top of the crude MDI storage tank through a fourth pipeline, and the gas phase between the transfer device and the crude MDI storage tank is balanced; the crude MDI storage tank is communicated with the loading platform through a fifth pipeline, and the crude MDI is transferred from the crude MDI storage tank to the loading platform; the heating assembly is arranged on the coarse MDI storage tank, the third pipeline and the fifth pipeline and used for heating and insulating the coarse MDI inside the coarse MDI storage tank. The crude MDI storage and transportation system is suitable for crude MDI transfer at ports, and is simple, convenient, reliable and safe.
Description
Technical Field
The invention belongs to the technical field of storage and transportation processes, and particularly relates to a port crude MDI storage and transportation system and a storage and transportation method.
Background
Polymethylene polyphenyl polyisocyanates, abbreviated PMDI, or crude MDI, are non-limiting cargoes. Pale yellow to brown viscous liquid with pungent odor. Relative density (20 deg.C) 1.2, ignition point 218 deg.C, freezing point<At 10 ℃ and a viscosity (25 ℃) of 200 to 1000 mPas. Crude MDI is in fact a mixture of 50% MDI and 50% of polyisocyanates having a functionality of more than 2. Can generate self-polymerization when being heated, and is dissolved in chlorobenzene, o-dichlorobenzene, toluene and the like. Has low toxicity and the maximum allowable concentration of 0.2mg/m in the air3. The goods need to be subjected to heat tracing and heat preservation, the heat preservation temperature needs to be controlled to be 39-45 ℃, and irreversible polymerization can occur when the temperature is too high or too low, so that the quality is influenced. Irreversible polymerization also occurs upon exposure to water vapor. Transportation distance is often required to be considered when coarse MDI is stored in ports, and long-distance chemical transportation cannot meet the requirement of operation safety risk control.
The existing storage system in the port has insufficient sealing property and heat insulating property, has certain safety risk and cannot meet the requirement of storage MDI. For example, CN208281808U discloses a long-distance transportation system for highly viscous oil products in petrochemical wharfs and storage areas, which completes long-distance oil product transportation to refinery terminals through the wharf, the highly viscous oil product storage tank, a control system and transportation equipment. However, the storage and transportation environment of the crude MDI is completely different from that of the high-viscosity oil product, and the considered indexes are different.
Therefore, how to design a simple, reliable and safe crude MDI storage and transportation system and a storage and transportation method suitable for ports and wharfs is a technical problem to be solved in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a port crude MDI storage and transportation system and a storage and transportation method, which can realize simple, reliable and safe storage and transportation of crude MDI materials in a port.
In a first aspect, the invention provides a port crude MDI storage and transportation system, which comprises a transfer device, at least two crude MDI storage tanks, a liquid nitrogen storage tank, a loading platform and a heating assembly, wherein the transfer device is used for transferring crude MDI to the at least two crude MDI storage tanks;
the liquid nitrogen storage tank is communicated with the transfer device through a first pipeline, is communicated with the crude MDI storage tank through a second pipeline and is used for providing nitrogen protection for the transfer device and the crude MDI storage tank;
the transfer device is communicated with the root part of the crude MDI storage tank through a third pipeline and used for transferring the crude MDI from the transfer device to the crude MDI storage tank, and the transfer device is also communicated with the top part of the crude MDI storage tank through a fourth pipeline and used for balancing gas phase between the transfer device and the crude MDI storage tank;
the crude MDI storage tank is communicated with the loading platform through a fifth pipeline and is used for transferring crude MDI from the crude MDI storage tank to the loading platform;
the heating assembly is arranged on the crude MDI storage tank, the third pipeline and the fifth pipeline and used for heating and insulating the crude MDI inside the crude MDI storage tank.
Further, the system also comprises a sixth pipeline and a seventh pipeline, wherein the sixth pipeline is communicated with the loading platform and the top of the crude MDI storage tank and is used for adsorbing and treating tail gas; and the seventh pipeline is communicated with the loading platform and the liquid nitrogen storage tank and is used for providing nitrogen protection for the loading platform.
Furthermore, the loading platform is provided with a mass flow meter, a batch control instrument and two loading arms, wherein the batch control instrument is used for controlling the crude MDI to carry out quantitative conveying and loading through the loading arms according to the data of the mass flow meter.
Furthermore, a connecting pipeline is arranged between the two upper loading arms, and the crude MDI can realize reverse circulation through the fifth pipeline and the connecting pipeline.
Further, the system also comprises a control component, wherein the crude MDI storage tank comprises a liquid level display and a temperature display, the liquid level display is used for measuring and displaying the liquid level of the crude MDI inside the crude MDI storage tank, and the temperature display is used for displaying the temperature;
the liquid level display and the temperature display are in communication connection with the control assembly, and the control assembly is used for controlling the heating assembly according to received signals of the liquid level display and the temperature display.
Furthermore, the heating assembly comprises a thermal circulation loop which is correspondingly arranged with each crude MDI storage tank, the thermal circulation loop comprises a thermal circulation pipeline, and a valve, a circulation pump and an electric heater which are respectively electrically connected with the control assembly, the valve is arranged at the root of the crude MDI storage tank, and the thermal circulation pipeline is sequentially communicated with the circulation pump, the electric heater and the top of the crude MDI storage tank from the valve.
Further, the liquid level display is provided with a set threshold value, and is used for sending a signal to the control assembly after the liquid level of the crude MDI exceeds the set threshold value, controlling the circulating pump and the electric heater and starting the thermal circulation loop; and the control component controls the power of the electric heater and the power of the heat circulating pump according to the received temperature display signal, so that the temperature values of the heat circulating pipeline and the coarse MDI in the coarse MDI storage tank are stabilized in a reasonable range.
Further, the circulating pump still with the fifth pipeline intercommunication, the control assembly still is used for through control the circulating pump starts the fifth pipeline and carries out the transportation loading of thick MDI, closes simultaneously the thermal cycle return circuit.
Further, the heating assembly further comprises a heat insulation layer and an electric tracing band, and the heat insulation layer and the electric tracing band are arranged on the third pipeline, the fifth pipeline and the heat circulation pipeline;
the thickness of the heat preservation layer is 5-10cm, the electric tracing band is electrically connected with the control component, and the control component is used for controlling the temperature of the electric tracing band to be stabilized within a reasonable range.
In a second aspect, the invention provides a storage and transportation method adopting the port crude MDI storage and transportation system, which comprises the following steps:
s1: starting the heating assembly, and preheating the third pipeline and the crude MDI storage tank;
s2: the transfer device transfers the crude MDI to each crude MDI storage tank through a third pipeline;
s3: starting a liquid nitrogen storage tank for transmission through a first pipeline, and performing nitrogen purging protection on the intermediate rotation device;
s4: the liquid level of the crude MDI in the crude MDI storage tank reaches a set threshold value, the crude MDI in the crude MDI storage tank is circularly heated, and the temperature of the circular heating is controlled in a reasonable range;
s5: and stopping the cyclic heating, preheating the fifth pipeline, and transferring the crude MDI from the crude MDI storage tank to the loading platform.
The invention designs a port crude MDI storage and transportation system by arranging the crude MDI storage tank, the liquid nitrogen storage tank, the loading platform, the heating assembly and each pipeline, and the crude MDI storage and transportation system is adopted to carry out the storage and transportation of the crude MDI, thereby achieving the following technical effects:
1. under the condition of meeting the storage and transportation requirements of the crude MDI, the method is more reliable and safer, has simple process flow and is convenient to operate and manage;
2. by controlling the heating assembly, the heat insulation and the water prevention are realized, the stability of the crude MDI in storage and transportation is ensured, and the operation benefit is improved;
3. the transfer process embodies the safety in operation, is convenient for nitrogen purging, and is convenient for ensuring and repairing the system.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic diagram illustrating a port crude MDI storage and transportation system according to an embodiment of the invention;
FIG. 2 is a schematic diagram showing a transmission part in a port crude MDI storage and transportation system according to an embodiment of the invention;
FIG. 3 is a schematic diagram showing a heat exchange part in a port crude MDI storage and transportation system according to an embodiment of the invention;
FIG. 4 is a schematic diagram showing a part of a truck in a port crude MDI storage and transportation system according to an embodiment of the invention;
fig. 5 is a flow chart illustrating a method for transporting a port crude MDI in accordance with an embodiment of the present invention.
Description of reference numerals: 1. the system comprises a transfer device, 21, a first crude MDI storage tank, 22, a second crude MDI storage tank, 3, a liquid nitrogen storage tank, 4, a loading platform, 41, a mass flow meter, 42, an upper loading arm, 43, a connecting pipeline, 51, a first heat circulation loop, 511, a first electric heater, 512, a first valve, 513, a first circulating pump, 52, a second heat circulation loop, 521, a second electric heater, 522, a second valve, 523, a second circulating pump, 61, a first pipeline, 62, a second pipeline, 63, a third pipeline, 64, a fourth pipeline, 65, a fifth pipeline, 66, a sixth pipeline, 67 and a seventh pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
The present invention will be described in detail with reference to specific examples. Fig. 1 shows a rough MDI storage and transportation system for a port in this embodiment, which includes a transfer device 1, two rough MDI storage tanks, a liquid nitrogen storage tank 3, a loading platform 4 and a heating assembly. The two crude MDI storage tanks are a first crude MDI storage tank 21 and a second crude MDI storage tank 22, respectively.
The liquid nitrogen storage tank 3 is communicated with the transfer device 1 through a first pipeline 61 and is communicated with the coarse MDI storage tank through a second pipeline 62, and the liquid nitrogen storage tank 3 can respectively provide sealing protection nitrogen for the transfer device 1 and the coarse MDI storage tank.
The nitrogen used by the liquid nitrogen storage tank 3 is 99.99 percent, and the dew point is liquid nitrogen at minus 40 ℃. The liquid nitrogen storage tank 3 can be 30M according to specific application conditions3A liquid nitrogen tank and a gasifier, the gasification amount is 800M per hour3The outlet pressure of the gasifier is 0.8Mpa, and the gasifier is conveyed to the loading platform 4, the crude MDI storage tank and the transfer device 1 through a pipeline and a branch line, and the tail end pressure is not less than 0.6 Mpa.
The transfer device 1 is communicated with the root of the crude MDI storage tank through a third pipeline 63, the crude MDI is conveyed from the transfer device 1 to the crude MDI storage tank during storage, transportation and unloading, the transfer device 1 is also communicated with the top of the crude MDI storage tank through a fourth pipeline 64, and the fourth pipeline 64 is used for balancing gas phase between the transfer device 1 and the crude MDI storage tank.
The third line 63 branches off at the tank side of the two crude MDI storage tanks and connects into the two crude MDI storage tanks, respectively. The tank bodies are insulated by aluminum silicate with the thickness of 10cm, the coarse MDI in the two tank bodies can realize tank conversion, and each tank body can also realize circulating heat exchange.
Since the crude MDI product requires 99.99% pure nitrogen purge at dew point-40 deg.C, a second line 62 is provided to introduce nitrogen from the liquid nitrogen storage tank 3. At the same time, a fourth line 64 is also provided leading from the top of the two crude MDI tanks to the transfer device 1 to facilitate the gas phase equilibrium for ship unloading.
The crude MDI storage tank is communicated with the loading platform 4 through a fifth pipeline 65, and the crude MDI is transported from the crude MDI storage tank to the loading platform 4.
The heating assembly heats the crude MDI storage tank, the third line 63 and the fifth line 65, respectively, ensuring that the temperature in the crude MDI storage tank and the lines is maintained at a reasonable temperature.
The heating assembly further comprises an insulating layer and an electric tracing band, and the third pipeline 63, the fifth pipeline 65 and the heat circulating pipeline are respectively provided with the insulating layer and the electric tracing band;
the thickness of the heat preservation layer is 5-10cm, the electric tracing band is electrically connected with the control component, and the control component is used for controlling the temperature of the electric tracing band to be stabilized in a reasonable range.
In this embodiment, the thickness of the insulating layer on the third pipeline 63, the fifth pipeline 65 and the thermal cycle pipeline is 5cm, which can be adjusted according to the actual situation, and generally does not exceed 10 cm. The electric tracing band is electrically connected with the control component, the control temperature of the electric tracing band is 39-45 ℃, and the specific temperature range is required to meet the chemical characteristics of the crude MDI.
The crude MDI storage tank comprises a liquid level display and a temperature display, wherein the liquid level display is used for measuring and displaying the liquid level of the crude MDI inside the crude MDI storage tank; the liquid level display and the temperature display are in communication connection with the control assembly, and the control assembly controls the heating assembly to heat according to received signals of the liquid level display and the temperature display.
The heating assembly comprises a thermal circulation loop, a first thermal circulation loop 51 and a second thermal circulation loop 52, which are arranged corresponding to each crude MDI storage tank. Each thermal circulation loop comprises a thermal circulation pipeline, and a valve (a first valve 512 and a second valve 522), a circulation pump (a first circulation pump 513 and a second circulation pump 523) and an electric heater (a first electric heater 511 and a second electric heater 521) which are respectively electrically connected with the control assembly, wherein the valve is arranged at the root part of the crude MDI storage tank, and the thermal circulation pipeline is sequentially communicated with the circulation pump, the electric heater and the top part of the crude MDI storage tank from the valve.
The crude MDI storage and transportation system is provided with 4 100KW pipeline type electric heaters, each crude MDI storage tank corresponds to 2 crude MDI storage tanks and is mutually standby, and goods in the tanks are subjected to heat exchange through the electric heaters in a circulation mode of a circulating pump for 24 hours, so that the temperature of the goods is ensured to be within a reasonable range (between 40 ℃ and 45 ℃). The circulating pump can select for use the magnetic drive pump, and every thermal cycle return circuit is equipped with 2 magnetic drive pumps, and Y type filter is installed additional to the pump import to realize frequency conversion control through pressure transmitter. 2 magnetic pumps may also be used for the fifth pipeline. The use mode is that the circulation is not carried out when loading, the loading is not carried out when the circulation, and the two pumps and the pipeline can realize mutual standby. Meanwhile, each pump can realize low liquid level, negative pressure in the tank and overpressure of a tail gas pipe of the vehicle platform.
The liquid level display is provided with a set threshold value and is used for sending a signal to the control assembly after the liquid level of the crude MDI exceeds the set threshold value, controlling the circulating pump and the electric heater and starting the heat circulation loop; the control component controls the power of the electric heater and the power of the heat circulating pump according to the received temperature display signal, so that the temperature values of the heat circulating pipeline and the coarse MDI in the coarse MDI storage tank are stabilized in a reasonable range.
The circulating pump is still communicated with fifth pipeline 65, and the control assembly is still used for starting fifth pipeline 65 through control circulating pump and carrying out the transportation loading of thick MDI, closes the thermal cycle return circuit simultaneously.
The crude MDI storage and transportation system also comprises a sixth pipeline 66 and a seventh pipeline 67, wherein the sixth pipeline 66 is communicated with the top of the loading platform 4 and the top of the crude MDI storage tank and is used for adsorbing and treating tail gas; the seventh pipeline 67 communicates with the loading platform 4 and the liquid nitrogen storage tank 3 for providing nitrogen protection for the loading platform 4.
The loading platform 4 is provided with a mass flow meter 41, a batch control instrument and two loading oil filling pipes 42, the batch control instrument is used for controlling the crude MDI to carry out quantitative conveying and loading through the loading oil filling pipes 42 according to the data of the mass flow meter 41, and the magnetic force pump conveys goods to the loading platform 4 for loading.
A Y-shaped filter is arranged in front of the inlet of the flowmeter, and a sixth pipeline 66 is connected to a crude MDI tank top carbon adsorption tail gas treatment device.
Two upper-loading oil filling riser 42 are designed on the loading platform 4, the upper-loading oil filling riser 42 is selected for the universal upper-loading oil filling riser, a connecting pipeline 43 is installed between the two oil filling riser, quantitative counter-circulation of materials between two crude MDI storage tanks can be realized through a batch control instrument (for example, each tank is counter-circulated to another tank by 5 tons every time, and the total circulation is 2 times), and the crystallization phenomenon of the crude MDI in the fifth pipeline 65 can be avoided when the vehicle is loaded in winter.
As shown in fig. 5, a method for transporting and transporting crude MDI in a port is provided, which comprises the following steps:
s1: starting the heating assembly, and preheating the third pipeline and the crude MDI storage tank;
s2: the transfer device transfers the crude MDI to each crude MDI storage tank through a third pipeline;
s3: starting a liquid nitrogen storage tank for transmission through a first pipeline, and performing nitrogen purging protection on the intermediate rotation device;
s4: the liquid level of the crude MDI in the crude MDI storage tank reaches a set threshold value, the crude MDI in the crude MDI storage tank is circularly heated, and the temperature of the circular heating is controlled in a reasonable range;
s5: and stopping the cyclic heating, preheating the fifth pipeline, and transferring the crude MDI from the crude MDI storage tank to the loading platform.
In another embodiment, a specific method for storing and transporting the crude MDI in the port is provided.
The process flow comprises the following steps:
the crude MDI is transported to a port wharf by a ship, directly transported to a crude MDI storage tank by a transfer device 1 through a crude MDI storage and transportation system, and then transported to a loading platform 4 for loading.
The crude MDI goods can not contact water and air, the sealing operation must be carried out under the protection of high-purity nitrogen (99.99%, -40 ℃) nitrogen, and the tail gas of the crude MDI storage tank is conveyed to a transfer device to return to a cabin for gas phase compensation at the same time of ship unloading.
1. Transmission of
As shown in fig. 2, the crude MDI storage vessel is shipped to a quay berth at a port, the ship unloading hose is connected to a third pipeline 63, and the ship unloading pump feeds the materials into the designated crude MDI storage tank; the specific process is as follows:
the ship unloading hose → the transfer device → the third pipeline → the crude MDI tank.
The crude MDI storage tank and the third pipeline 63 are preheated by starting the electric tracing band 5 hours before the ship comes, high-purity nitrogen (99.99%, -40 ℃) is used for blowing before and after the ship is unloaded, the liquid nitrogen storage tank 3 is started to blow the residual goods in the ship unloading pipeline to the crude MDI storage tank through the transmission of the first pipeline 61, and the third pipeline 63 realizes the line sweeping of the ball.
The flow rate of the crude MDI was controlled at 140m during the transfer3And about/h, the gas phase pressure of the crude MDI storage tank is maintained at about 2.8Kpa, and the electric tracing band of the pipeline is automatically opened and closed according to a set temperature value, so that the temperature of the material is maintained in a safety range of 39-45 ℃.
2. Storage warehouse
The crude MDI storage tank can be made of carbon steel, the tank body is provided with a heat insulation layer for heat insulation, the crude MDI storage tank is communicated with the liquid nitrogen storage tank 3 through the second pipeline 62, the second pipeline 62 is provided with a nitrogen sealing valve for realizing nitrogen sealing of high-purity nitrogen (99.99%, -40 ℃), the nitrogen sealing valve is automatically started for air supplement when the gas phase pressure of the storage tank is lower than 2Kpa, and the nitrogen sealing valve is automatically closed when the gas phase pressure of the storage tank is higher than 2 Kpa. The storage tank is provided with a pressure gauge, a multipoint thermometer and a double-radar liquid level meter to ensure the quality and quantity of goods and the safety and environmental protection of storage.
3. Heat exchange
Referring to fig. 3, when the temperature of goods in the crude MDI storage tank reaches a set threshold (which may be 39 ℃), the circulation pump is started, the goods enter the electric heater through the hot circulation line, the heating temperature is controlled within a reasonable range (according to the chemical characteristics of the crude MDI, the value selected in the reasonable range in this embodiment is 45 ℃), the goods enter the crude MDI storage tank, the circulation pump is set to be started for 24 hours, but the operation is suspended when the goods are loaded. The whole thermal cycle pipeline valve is laid with electric tracing band and is insulated. The specific process is as follows:
coarse MDI storage tank → circulating pump → electric heater → coarse MDI storage tank.
The circulating flow rate is controlled to be about 60m3And the electric heater is automatically turned on and off according to a set value every hour, when the temperature of the goods is reduced to 39 ℃, the electric heater is automatically started, and when the temperature of the goods is increased to 45 ℃, the electric heater is automatically turned off.
4. Loading vehicle
As shown in fig. 4, the storage tank materials are quantitatively loaded and delivered through a fifth pipeline 65, and the quantitative loading is realized by adopting an upper loading arm, a batch control instrument and a pneumatic valve. The specific process is as follows:
coarse MDI storage tank → circulating pump → loading platform → loading crane pipe → quantitative loading.
The flow rate of loading is controlled to be about 60m3Every hour, the fifth pipeline 65 is provided with an electric tracing band and is automatically opened and closed according to a set temperature value, so that the temperature of the material is maintained in a safety range of 39-45 ℃. Wherein, thick MDI storage tank, third pipeline 63, fifth pipeline 65 and electric heater all set up control by temperature change and temperature display device and liquid level display device, and control assembly is all received to control by temperature change, temperature display device and liquid level display device.
The loading platform 4 is connected with a quantitative loading control system (comprising a batch control instrument, a flow meter and a pneumatic valve) of the loading shed, and the quantitative loading control system of the loading shed can realize automatic and accurate loading and delivery of the crude MDI.
The crude MDI goods are protected by nitrogen in the storage and transportation process, the goods are not easy to volatilize, and tail gas mainly comes from the transmission operation and the storage of the nitrogen containing a small amount of the goods. And (3) waste gas treatment measures: during transmission, gas in the crude MDI tank returns to the transfer device through the gas phase balance pipe to realize gas phase balance; and the tail gas of the scavenging line enters the crude MDI tank, enters the carbon absorption device through a single breath valve or a meteorological balance pipe, and is discharged. Tail gas generated by loading enters the carbon adsorption device through a tail gas pipeline and is then discharged.
The foregoing describes preferred embodiments of the present invention, and is intended to provide a clear and concise description of the spirit and scope of the invention, and not to limit the same, but to include all modifications, substitutions, and alterations falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A port crude MDI storage and transportation system is characterized by comprising a transfer device, at least two crude MDI storage tanks, a liquid nitrogen storage tank, a loading platform and a heating assembly;
the liquid nitrogen storage tank is communicated with the transfer device through a first pipeline, is communicated with the crude MDI storage tank through a second pipeline and is used for providing nitrogen protection for the transfer device and the crude MDI storage tank;
the transfer device is communicated with the root part of the crude MDI storage tank through a third pipeline and used for transferring the crude MDI from the transfer device to the crude MDI storage tank, and the transfer device is also communicated with the top part of the crude MDI storage tank through a fourth pipeline and used for balancing gas phase between the transfer device and the crude MDI storage tank;
the crude MDI storage tank is communicated with the loading platform through a fifth pipeline and is used for transferring crude MDI from the crude MDI storage tank to the loading platform;
the heating assembly is arranged on the crude MDI storage tank, the third pipeline and the fifth pipeline and used for heating and insulating the crude MDI inside the crude MDI storage tank.
2. The system of claim 1, further comprising a sixth line and a seventh line, the sixth line communicating the loading platform and the top of the crude MDI storage tank for sorptively treating tail gas; and the seventh pipeline is communicated with the loading platform and the liquid nitrogen storage tank and is used for providing nitrogen protection for the loading platform.
3. The system of claim 1, wherein the loading platform is provided with a mass flow meter, a batch control instrument and two loading arms, and the batch control instrument is used for controlling the crude MDI to carry out quantitative conveying loading through the loading arms according to data of the mass flow meter.
4. The system of claim 3, wherein a connecting line is provided between two of said top-loading arms, and wherein the crude MDI is counter-circulated via said fifth line and said connecting line.
5. The system of claim 1, further comprising a control assembly, the crude MDI storage tank including a level display and a temperature display therein for measuring and displaying a level of the crude MDI therein and a temperature;
the liquid level display and the temperature display are in communication connection with the control assembly, and the control assembly is used for controlling the heating assembly according to received signals of the liquid level display and the temperature display.
6. The system of claim 5, wherein the heating assembly comprises a thermal circulation loop corresponding to each crude MDI storage tank, the thermal circulation loop comprises a thermal circulation pipeline, and a valve, a circulation pump and an electric heater which are respectively electrically connected with the control assembly, the valve is arranged at the root of the crude MDI storage tank, and the thermal circulation pipeline is communicated with the circulation pump, the electric heater and the top of the crude MDI storage tank from the valve in sequence.
7. The system of claim 6, wherein the level display is provided with a set threshold for sending a signal to the control assembly to control the circulation pump and the electric heater to activate the thermal circulation loop after the level of the crude MDI exceeds the set threshold; and the control component controls the power of the electric heater and the power of the heat circulating pump according to the received temperature display signal, so that the temperature values of the heat circulating pipeline and the coarse MDI in the coarse MDI storage tank are stabilized in a reasonable range.
8. The system of claim 6, wherein the circulation pump is further in communication with the fifth line, and the control assembly is further configured to initiate a transfer loading of the crude MDI by controlling the circulation pump to activate the fifth line while the thermal cycle loop is closed.
9. The system of claim 6, wherein the heating assembly further comprises an insulating layer and an electric trace strip, the insulating layer and the electric trace strip being disposed on the third pipeline, the fifth pipeline, and the heat circulation pipeline;
the thickness of the heat preservation layer is 5-10cm, the electric tracing band is electrically connected with the control component, and the control component is used for controlling the temperature of the electric tracing band to be stabilized within a reasonable range.
10. A method for transporting a crude MDI in a port using the system of any one of claims 1 to 9, comprising the steps of:
s1: starting the heating assembly, and preheating the third pipeline and the crude MDI storage tank;
s2: the transfer device transfers the crude MDI to each crude MDI storage tank through a third pipeline;
s3: starting a liquid nitrogen storage tank for transmission through a first pipeline, and performing nitrogen purging protection on the intermediate rotation device;
s4: the liquid level of the crude MDI in the crude MDI storage tank reaches a set threshold value, the crude MDI in the crude MDI storage tank is circularly heated, and the temperature of the circular heating is controlled in a reasonable range;
s5: and stopping the cyclic heating, preheating the fifth pipeline, and transferring the crude MDI from the crude MDI storage tank to the loading platform.
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| CN114261644B (en) | 2023-02-24 |
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