Control method for methyl acrylate storage system and storage system

Abstract

The invention discloses a control method for a methyl acrylate storage system and the storage system.The storage system comprises a liquid storage tank used for storing methyl acrylate; the gas supply unit is used for providing polymerization inhibition gas for the liquid storage tank inner body; and the control unit is used for controlling the storage system to work, and when the methyl acrylate liquid is stored in the liquid storage tank, the control unit controls the gas supply unit to continuously provide the polymerization inhibition gas. The methyl acrylate storage system has the beneficial effects that a set of storage system with the liquid storage tank is arranged, so that a supply manufacturer can transport methyl acrylate by adopting a tank car, secondary reshipment is not needed in the production and use process, the safety coefficient of materials in the storage and transportation process is improved, and the use cost is reduced; and polymerization inhibition gas is introduced into the liquid storage tank, so that self-polymerization of the methyl acrylate can be prevented, the storage system can store the methyl acrylate for a long time, meanwhile, the polymerization inhibition gas does not reduce the purity of the material, and the subsequent polymerization reaction rate is accelerated.

Description

Technical Field

[0001] The invention belongs to the field of polymer compound storage systems, and in particular, relates to a control method and a storage system for methyl acrylate. Background Art

[0002] Methyl acrylate is widely used in the field of carbon fiber spinning due to its superior properties.

[0003] However, due to the active chemical properties of methyl acrylate materials, methyl acrylate materials often polymerize themselves, which not only affects their use but also brings safety risks. Suppliers usually use insulated barrels to contain methyl acrylate materials, with a net weight of 180 kg per barrel. With the increase in production usage, safe storage and transportation have become concerns. The cost of repackaging barreled materials is high, and the production and use process requires secondary transportation, which increases safety and usage costs. In addition, during the storage process, in order to ensure that the methyl acrylate material does not self-polymerize, anisole inhibitor is added to the methyl acrylate material, but the additive not only affects the purity of the material, but also affects the subsequent polymerization reaction rate.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, and provide a control method and a storage system for a storage system of methyl acrylate. By setting up a storage system, the methyl acrylate material is directly stored in a liquid storage tank, so that the supplier can use a tank truck for transportation, and there is no need for secondary transportation during production and use, thereby solving the problem of low safety factor and high use cost of the methyl acrylate material during storage and transportation; and, through the gas supply unit of the control system, an inhibitory gas is introduced into the liquid storage tank to increase the dissolved gas amount of the inhibitory gas and prevent methyl acrylate from self-polymerization, thereby solving the problem of reduced material purity and slow subsequent polymerization reaction rate caused by adding an inhibitor.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a control method for a storage system for methyl acrylate, the storage system comprising a liquid storage tank for storing methyl acrylate; a gas supply unit for providing an anti-polymerization gas to the liquid storage tank; and a control unit for controlling the operation of the storage system. When methyl acrylate liquid is stored in the liquid storage tank, the control unit controls the gas supply unit to continuously provide an anti-polymerization gas.

[0007] Furthermore, the storage system is equipped with a concentration monitoring unit for monitoring the amount of dissolution of the inhibitor in the methyl acrylate liquid; during the operation of the gas supply unit, the concentration monitoring unit monitors the actual amount of dissolution of the methyl acrylate liquid, and the control unit adjusts the gas flow of the gas supply unit and / or the concentration of the inhibitor in the gas according to the actual amount of dissolution.

[0008] Furthermore, during the operation of the gas supply unit, the control unit determines whether the actual dissolved amount is greater than or equal to a preset first dissolved amount threshold; if not, the gas supply unit increases the gas flow rate and / or increases the concentration of the inhibitor in the gas;

[0009] Preferably, a second solubility threshold greater than the first solubility threshold is preset; after determining that the actual solubility is greater than or equal to the first solubility threshold, the control unit determines whether the actual solubility is less than or equal to the second solubility threshold; if not, the gas supply unit is controlled to reduce the gas flow rate and / or reduce the concentration of the inhibitor in the gas.

[0010] Furthermore, the storage system includes a cooling unit for reducing the temperature of the methyl acrylate liquid, and a first temperature monitoring unit for monitoring the temperature of the methyl acrylate liquid; when the methyl acrylate liquid is stored in the liquid storage tank, the cooling unit starts to work, the first temperature monitoring unit works to obtain the actual temperature, and the control unit determines whether the actual temperature is less than or equal to a preset first temperature threshold; if not, the cooling efficiency of the cooling unit is improved;

[0011] Preferably, a second temperature threshold lower than the first temperature threshold is preset; after determining that the actual temperature is less than or equal to the first temperature threshold, the control unit determines whether the actual temperature is greater than or equal to the preset second temperature threshold; if so, the cooling efficiency of the cooling unit is reduced.

[0012] Furthermore, the storage system includes a circulation pipeline connected to the liquid storage tank, and a pumping device is connected in series on the circulation pipeline; the cooling unit is a cooler connected in series on the circulation pipeline, and a refrigerant channel for refrigerant to flow through is provided in the cooler; the control unit improves the cooling efficiency of the cooling unit by increasing the flow rate of methyl acrylate in the circulation pipeline and / or increasing the flow rate of the refrigerant and / or reducing the temperature of the refrigerant.

[0013] Furthermore, the circulation pipeline includes at least two connecting branches that can be connected to the liquid storage tank, and the liquid outlet ends of each connecting branch are respectively located at different heights, and the liquid storage tank is provided with a liquid level monitoring unit; during the operation of the pumping device, the liquid level monitoring unit is controlled to monitor the actual liquid level of the liquid storage tank, and the control unit determines whether the actual liquid level is greater than or equal to a preset first liquid level height; if so, the higher connecting branch is controlled to be connected; if not, the lower connecting branch is controlled to be connected;

[0014] Preferably, a second liquid level height lower than the first liquid level height is preset; when the actual liquid level is lower than the first liquid level height, the control unit determines whether the actual liquid level is lower than or equal to the second liquid level height;

[0015] If so, the pumping device and the cooling unit are controlled to stop running.

[0016] Furthermore, the storage system is also configured with a second temperature monitoring unit for monitoring the temperature of the methyl acrylate liquid, and the monitoring end of the second temperature monitoring unit is arranged at a certain distance from the monitoring end of the first temperature monitoring unit; when methyl acrylate liquid is stored in the liquid storage tank, the control unit calculates the average value of the monitoring values ​​of each first temperature monitoring unit to obtain the actual temperature.

[0017] Furthermore, when methyl acrylate liquid is stored in the liquid storage tank, the control unit calculates the absolute difference between the monitoring values ​​of the first temperature monitoring unit and the second temperature detection unit, and increases the flow rate of the circulation pipeline when the absolute difference is greater than a preset standard deviation.

[0018] Furthermore, the storage system is provided with a liquid inlet pipe connected to the liquid storage tank, and the liquid inlet pipe is provided with a third temperature monitoring unit for monitoring the temperature in the liquid inlet pipe, and the cooler can cool the methyl acrylate liquid in the liquid inlet pipe; when the storage system feeds liquid into the liquid storage tank through the liquid inlet pipe, the control unit adjusts the cooling efficiency of the cooler on the methyl acrylate in the liquid inlet pipe according to the liquid inlet temperature obtained by the third temperature monitoring unit.

[0019] A storage system for methyl acrylate is controlled by the control method for the storage system for methyl acrylate as described above.

[0020] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: by setting up a storage system with a liquid storage tank, the supplier can use a tank truck to transport methyl acrylate, and no secondary transportation is required during production and use, thereby improving the safety factor of the material during storage and transportation and reducing the use cost;

[0021] In addition, by introducing the polymerization inhibitor gas, the self-polymerization of methyl acrylate can be effectively prevented, so that the methyl acrylate can be stored for a long time. The polymerization inhibitor gas will not reduce the purity of the material and accelerate the subsequent polymerization reaction rate.

[0022] At the same time, the invention has a simple structure, significant effects and is suitable for popularization and use.

[0023] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0025] Figure 1is a schematic structural diagram of a storage system for methyl acrylate according to an embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of an air supply unit according to an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a gas scrubber according to an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the first liquid level monitoring unit according to an embodiment of the present invention.

[0029] In the figure: 1, liquid storage tank; 110, liquid inlet pipe; 111, liquid inlet pump; 112, liquid inlet main pipe; 113, liquid inlet branch pipe; 120, liquid outlet pipe; 130, first liquid level monitoring unit; 131, first liquid level gauge; 132, first high measuring pipe; 133, first low measuring pipe; 141, first temperature monitoring unit; 142, second temperature monitoring unit; 2, air supply unit; 210, air inlet pipe; 211, bubbling liquid level gauge; 220, Gas storage tank; 221, gas supply device; 222, gas mixer; 223, gas supply pipe; 224, gas mixing pipe; 3, cooling unit; 310, cooler; 4, purge unit; 410, hose station; 420, liquid inlet purge pipe; 421, first purge pipe; 422, second purge pipe; 5, gas scrubber; 501, tower body; 502, waste pipe; 503, first filler; 504, second filler; 505, water supply pipe; 510, main Exhaust pipe; 511, air supply unit; 520, first exhaust branch pipe; 521, first branch pipe; 522, second branch pipe; 530, second exhaust branch pipe; 540, circulation spray pump; 541, circulation pipe; 542, spray pipe; 543, waste water pipe; 550, second liquid level monitoring unit; 551, second liquid level meter; 552, second high measuring pipe; 553, second low measuring pipe; 560, observation liquid level monitoring unit; 561, observation 562, observation high measuring tube; 563, observation low measuring tube; 6, transportation equipment; 610, transportation tank; 710, pumping device; 720, connecting pipe; 721, connecting branch pipe; 721a, first connecting branch pipe; 721b, second connecting branch pipe; 723, switching valve; 724, injection device; 730, pre-cooling pipe; 810, spare pumping device; 820, spare liquid outlet pipe; 9, liquid outlet main pipe; 910, liquid outlet branch pipe.

[0030] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0032] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1-4 As shown, in an embodiment of the present invention, a control method for a storage system for methyl acrylate is introduced, the storage system includes a liquid storage tank 1 for storing methyl acrylate; a gas supply unit 2 for providing an anti-polymerization gas to the liquid storage tank 1; and a control unit for controlling the operation of the storage system. When methyl acrylate liquid is stored in the liquid storage tank 1, the control unit controls the gas supply unit 2 to continuously provide an anti-polymerization gas.

[0035] Through the above-mentioned arrangement, by setting up a storage system with a liquid storage tank 1, the supplier can use a tank truck to transport methyl acrylate, and there is no need for secondary transportation during production and use, which improves the safety factor of the material during storage and transportation and reduces the cost of use; and by introducing an inhibitory gas, the self-polymerization of methyl acrylate can be effectively prevented to achieve long-term storage of methyl acrylate, and the inhibitory gas will not reduce the purity of the material, thereby accelerating the subsequent polymerization reaction rate.

[0036] It should be noted that the inhibitory gas is a single gas or a mixed gas containing oxygen and / or nitrogen and / or an inert gas; preferably, the inhibitory gas is a mixed gas containing oxygen and / or nitrogen.

[0037] In an embodiment of the present invention, the storage system is configured with a concentration monitoring unit for monitoring the amount of dissolution of the inhibitor in the methyl acrylate liquid; during the operation of the gas supply unit 2, the concentration monitoring unit monitors the actual amount of dissolution of the methyl acrylate liquid, and the control unit adjusts the gas flow rate of the gas supply unit 2 and / or the concentration of the inhibitor in the gas according to the actual amount of dissolution; so that the control unit can adjust the gas supply unit 2 in real time according to the monitoring value of the concentration monitoring unit, and the storage system can automatically adjust the amount of dissolution of the inhibitor by methyl acrylate, thereby preventing the self-polymerization of methyl acrylate and avoiding the waste of inhibitor gas, thereby reducing the operating cost.

[0038] In an embodiment of the present invention, the concentration monitoring unit monitors the dissolved amount of oxygen and / or nitrogen and / or inert gas in methyl acrylate; preferably, the concentration monitoring unit monitors the dissolved amount of oxygen and / or nitrogen in methyl acrylate; more preferably, the concentration monitoring unit monitors the dissolved amount of oxygen in methyl acrylate.

[0039] In an embodiment of the present invention, the gas supply unit 2 includes a gas tank 220, which is connected to the liquid storage chamber through an air inlet pipe 210; a plurality of gas supply devices 221, which respectively store different types of gases, and each gas supply device 221 is respectively connected to the gas tank 220; a mixed gas containing a suitable oxygen concentration and / or nitrogen concentration is prepared by introducing a plurality of gases into the gas tank 220 for mixing, so that the gas supply unit 2 can adaptively adjust the content of oxygen and / or nitrogen and / or inert gas in the mixed gas according to the liquid level and operating status of the liquid storage pipe.

[0040] In an embodiment of the present invention, the concentration monitoring unit monitors the amount of dissolved oxygen in the methyl acrylate liquid; when the control unit adjusts the concentration of oxygen in the gas according to the actual dissolved amount, the control unit increases or decreases the opening of the gas supply device 221 for storing nitrogen, and / or decreases or increases the opening of the gas supply device 221 for storing oxygen or oxygen-containing gas; thereby adjusting the oxygen concentration of the mixed gas in the gas storage tank 220.

[0041] In an embodiment of the present invention, the gas supply devices 221 are respectively configured with gas supply pipes 223, and each gas supply pipe 223 is respectively connected to a gas mixer 222. The gas mixer 222 is used to fully mix the various types of gases introduced, and the gas outlet of the gas mixer 222 is connected to the gas storage tank 220 through a mixing pipe 224. By setting the gas mixer 222, the gas output by each gas supply device 221 is fully mixed by the gas mixer 222 before entering the gas storage tank 220, so as to reduce the density difference between the gas entering the gas storage tank 220 and the gas contained in the gas storage tank 220, so as to avoid the gas stratification in the gas storage tank 220 caused by the large difference between the gas provided by each gas supply device 221 and the gas contained in the gas storage tank 220 after entering the gas storage tank 220.

[0042] In an embodiment of the present invention, during the operation of the gas supply unit 2, the control unit determines whether the actual dissolved amount is greater than or equal to a preset first dissolved amount threshold; if not, the gas supply unit 2 increases the gas flow rate and / or increases the concentration of the inhibitor in the gas; so as to improve the dissolution efficiency of the inhibitor when the dissolved amount of the inhibitor is low.

[0043] In an embodiment of the present invention, a second solubility threshold value greater than the first solubility threshold value is preset; after determining that the actual solubility is greater than or equal to the first solubility threshold value, the control unit determines whether the actual solubility is less than or equal to the second solubility threshold value; if not, the gas supply unit 2 is controlled to reduce the gas flow rate and / or reduce the concentration of the inhibitor in the gas; when the solubility of the inhibitor is too high, the solubility of the inhibitor in methyl acrylate is controlled within a set range by reducing the flow rate or the concentration of the inhibitor in the gas to avoid wasting the inhibitor gas.

[0044] In an embodiment of the present invention, the liquid storage tank 1 has multiple working states, including a liquid inlet state, in which methyl acrylate is introduced into the liquid storage chamber through the liquid inlet pipe 110; a liquid outlet state, in which methyl acrylate is output to a subsequent device through the liquid outlet pipe 120; and a storage state, in which methyl acrylate is stored in the liquid storage chamber, which is independent of the liquid inlet state and the liquid outlet state.

[0045] In an embodiment of the present invention, during the operation of the gas supply unit 2, the control unit determines whether the liquid storage tank 1 is in a liquid inlet state or a liquid outlet state, and if so, adjusts the gas flow rate of the gas supply unit 2; if not, adjusts the concentration of the polymerization inhibitor in the gas; Preferably, in an embodiment of the present invention, during the operation of the gas supply unit 2, the control unit determines whether the liquid storage tank 1 is in a liquid inlet state or a liquid outlet state, and if so, adjusts the gas flow rate of the gas supply unit 2 and adjusts the concentration of the polymerization inhibitor in the gas;

[0046] When the liquid is introduced into the liquid storage tank 1, since the concentration of the inhibitor of polymerization of methyl acrylate entering the liquid storage tank 1 is usually lower than the concentration of the inhibitor of polymerization of methyl acrylate stored in the liquid storage tank 1, the actual amount of dissolution monitored is reduced, and at this time the liquid level in the liquid storage chamber is gradually increasing, and the gas flow rate is increased to increase the overall amount of dissolution; and when the liquid is discharged from the liquid outlet pipe 120, the liquid level in the liquid storage chamber drops, so that the demand for inhibitors for the remaining methyl acrylate in the liquid storage chamber is reduced. By reducing the gas flow rate, the amount of dissolution is reduced, and the gas usage and operating power are reduced, thereby reducing the operating cost of the storage system;

[0047] In addition, in the storage state, the liquid level in the liquid storage chamber remains basically unchanged. When the actual dissolved amount monitored exceeds the upper limit or is lower than the lower limit, if the flow rate is increased, the gas will flow too fast in the material, and the material will not have time to fully dissolve the inhibitor gas in the gas, resulting in a waste of the inhibitor. If the flow rate is reduced, there will be insufficient gas pressure for the gas to flow into the liquid storage chamber, resulting in blockage of the air inlet pipe 210 and even methyl acrylate backflow into the liquid inlet pipe 110. At this time, the most suitable adjustment method is to adjust the concentration of the inhibitor in the gas, which can achieve the actual dissolution amount of methyl acrylate liquid while avoiding the above-mentioned problems.

[0048] In the embodiment of the present invention, the control steps of the control unit on the air supply unit 2 are as follows:

[0049] S11: Control the concentration monitoring unit to monitor and obtain the actual dissolved amount;

[0050] S12: The control unit determines whether the actual dissolution amount is greater than or equal to the first dissolution amount threshold; if so, execute S16; if not, execute S13;

[0051] S13: Determine whether the liquid storage tank 1 is in a liquid filling state; if so, execute S14; if not, execute S15;

[0052] S14: Increase the gas flow rate of the gas supply unit 2, and execute S11;

[0053] S15: increasing the concentration of the polymerization inhibitor in the gas provided by the gas supply unit 2, and executing S11;

[0054] S16: The control unit determines whether the actual dissolution amount is less than or equal to the second dissolution amount threshold; if so, execute S11; if not, execute S17;

[0055] S17: Determine whether the liquid storage tank 1 is in a liquid discharge state; if so, execute S18; if not, execute S19;

[0056] S18: reduce the gas flow rate of the gas supply unit 2 and execute S11;

[0057] S19: reducing the concentration of the polymerization inhibitor in the gas provided by the gas supply unit 2, and executing S11;

[0058] In the embodiment of the present invention, after increasing or decreasing the gas flow rate of the gas supply unit 2 or the concentration of the gas polymerization inhibitor, a certain period of time needs to be waited before executing S11 again.

[0059] In an embodiment of the present invention, the storage system includes a cooling unit 3 for reducing the temperature of methyl acrylate liquid, and a first temperature monitoring unit 141 for monitoring the temperature of the methyl acrylate liquid; when methyl acrylate liquid is stored in the liquid storage tank 1, the cooling unit 3 starts to work, the first temperature monitoring unit 141 works to obtain the actual temperature, and the control unit determines whether the actual temperature is less than or equal to a preset first temperature threshold; if not, the cooling efficiency of the cooling unit 3 is improved.

[0060] Through the above arrangement, the temperature of methyl acrylate is lowered to further prevent the self-polymerization of methyl acrylate in the liquid storage tank 1; and the temperature of methyl acrylate in the liquid storage tank 1 is monitored to improve the control accuracy of the storage system, and when the temperature of methyl acrylate is high, it is cooled in time.

[0061] In an embodiment of the present invention, a second temperature threshold lower than the first temperature threshold is preset; after determining that the actual temperature is less than or equal to the first temperature threshold, the control unit determines whether the actual temperature is greater than or equal to the preset second temperature threshold; if so, the cooling efficiency of the cooling unit 3 is reduced; so as to control the temperature of the methyl acrylate in the liquid storage tank 1 between the first temperature threshold and the second temperature threshold, while preventing the methyl acrylate from self-polymerization, avoiding excessive cooling of the methyl acrylate, resulting in energy waste.

[0062] In an embodiment of the present invention, the storage system includes a circulation pipeline connected to the liquid storage tank 1, and a pumping device 710 is connected in series on the circulation pipeline; the cooling unit 3 is a cooler 310 connected in series on the circulation pipeline, and a refrigerant channel for refrigerant to flow through is provided in the cooler 310; the control unit improves the cooling efficiency of the cooling unit 3 by increasing the flow rate of methyl acrylate in the circulation pipeline and / or increasing the flow rate of the refrigerant and / or reducing the temperature of the refrigerant; the methyl acrylate is cooled by using the cooler 310 in a heat exchange manner, and the cooling efficiency of the cooler 310 on the material is changed by flow regulation or refrigerant temperature regulation.

[0063] In an embodiment of the present invention, when adjusting the cooling efficiency of the cooling unit 3, the control unit determines whether the liquid storage tank 1 is in a liquid inlet state or a liquid outlet state. If so, the flow rate of methyl acrylate in the circulation pipeline is adjusted; if not, the flow rate of the refrigerant is adjusted and / or the temperature of the refrigerant is lowered; when adjusting the cooling efficiency of the cooling unit 3, the working state in the liquid storage tank 1 is judged to distinguish whether the temperature change is due to a change in the liquid level or a change in the heat exchange efficiency of the cooler 310, thereby further improving the rationality of the regulation of the cooling unit 3 of the storage unit.

[0064] In the embodiment of the present invention, the control steps of the control unit on the cooling unit 3 are as follows:

[0065] S21: Control the first temperature monitoring unit 141 to monitor and obtain the actual temperature;

[0066] S22: The control unit determines whether the actual temperature is less than or equal to the first temperature threshold; if so, execute S26; if not, execute S23;

[0067] S23: Determine whether the liquid storage tank 1 is in a liquid filling state; if so, execute S24; if not, execute S25;

[0068] S24: increasing the flow rate of methyl acrylate in the circulation pipeline, and executing S21;

[0069] S25: increasing the flow rate of the refrigerant and / or reducing the temperature of the refrigerant, and executing S21;

[0070] S26: The control unit determines whether the actual temperature is greater than or equal to the second temperature threshold; if so, execute S27; if not, execute S21;

[0071] S27: Determine whether the liquid storage tank 1 is in a liquid discharge state; if so, execute S18; if not, execute S19;

[0072] S18: reducing the flow rate of methyl acrylate in the circulation pipeline, and executing S11;

[0073] S19: reduce the flow rate of the refrigerant and / or increase the temperature of the refrigerant, and execute S11;

[0074] In the embodiment of the present invention, after adjusting the cooling efficiency of the cooling unit 3, a period of time needs to be waited before executing S11 again.

[0075] In an embodiment of the present invention, the circulation pipeline includes at least two connecting branches 721 which are connected to the liquid storage tank 1 in a disconnectable manner, and the liquid outlet ends of each connecting branch 721 are located at different heights, and a liquid level monitoring unit is arranged on the liquid storage tank 1; during the operation of the pumping device 710, the liquid level monitoring unit is controlled to monitor the actual liquid level of the liquid storage tank 1, and the control unit determines whether the actual liquid level is greater than or equal to a preset first liquid level height; if so, the higher connecting branch 721 is controlled to be connected; if not, the lower connecting branch 721 is controlled to be connected.

[0076] Through the above arrangement, by arranging connecting branches 721 at different heights in the liquid storage tank 1, methyl acrylate material can be introduced into the liquid storage tank 1 at different heights, so that the methyl acrylate material in the liquid storage tank 1 is disturbed by liquid, thereby achieving the purpose of stirring the liquid, avoiding the self-polymerization and precipitation of methyl acrylate due to long-term standing, so that the liquid storage tank 1 can store materials for a long time.

[0077] In an embodiment of the present invention, a second liquid level height lower than the first liquid level height is preset; when the actual liquid level is lower than the first liquid level height, the control unit determines whether the actual liquid level is lower than or equal to the second liquid level height; if so, the pumping device 710 and the cooling unit 3 are controlled to stop running; when the actual liquid level is too low, the circulation is stopped to prevent the pumping device 710 from idling.

[0078] In an embodiment of the present invention, the first liquid level is higher than the liquid outlet of the higher connecting branch pipe 721 ; the second liquid level is higher than the liquid outlet of the lower connecting branch pipe 721 ; preferably, the first liquid level is flush with the liquid outlet of the higher connecting branch pipe 721 .

[0079] In the embodiment of the present invention, a first liquid level monitoring unit 130 is provided on the liquid storage tank 1, and the liquid level height in the liquid storage tank 1 is monitored by the first liquid level detection unit.

[0080] In an embodiment of the present invention, the first liquid level monitoring unit 130 includes a first liquid level gauge 131, which is connected to a first high measuring tube 132 and a first low measuring tube 133. The liquid inlet ends of the first high measuring tube 132 and the first low measuring tube 133 are respectively connected to the liquid storage cavity of the liquid storage tank 1, and the liquid inlet end of the first high measuring tube 132 is higher than the liquid inlet end of the first low measuring tube 133; the liquid inlet end of the first high measuring tube 132 is located at the first liquid level height, and the first low measuring tube 133 is located at the second liquid level height.

[0081] In an embodiment of the present invention, the storage system is further configured with a second temperature monitoring unit 142 for monitoring the temperature of the methyl acrylate liquid. The monitoring end of the second temperature monitoring unit 142 and the monitoring end of the first temperature monitoring unit 141 are arranged at a certain distance from each other. When methyl acrylate liquid is stored in the liquid storage tank 1, the control unit calculates the average value of the monitoring values ​​of each first temperature monitoring unit 141 to obtain the actual temperature, so as to improve the stability of temperature monitoring in the liquid storage tank 1.

[0082] In an embodiment of the present invention, the monitoring end of the second temperature detection unit is lower than the monitoring end of the first temperature detection unit; and the distance between the monitoring end of the second temperature detection unit and the monitoring end of the first temperature detection unit in the circumferential direction of the liquid storage chamber wall is greater than or equal to one quarter of the circumference of the liquid storage chamber.

[0083] In an embodiment of the present invention, when methyl acrylate liquid is stored in the liquid storage tank 1, the control unit calculates the absolute difference between the monitoring values ​​of the first temperature monitoring unit 141 and the second temperature detection unit respectively, and when the absolute difference is greater than the preset standard deviation, the flow rate of the circulation pipeline is increased; when it is judged that the monitoring values ​​of the two temperature monitoring units have a large numerical difference, the fluidity of the methyl acrylate in the liquid storage tank 1 is poor, and the circulation pipeline cannot fully and effectively disturb the methyl acrylate in the liquid storage tank 1. By increasing the flow rate of the circulation pipeline to improve the disturbance effect, it is avoided that the methyl acrylate in the liquid storage tank 1 will self-precipitate due to standing.

[0084] In an embodiment of the present invention, the storage system is provided with a liquid inlet pipe 110 connected to the liquid storage tank 1, and the liquid inlet pipe 110 is provided with a third temperature monitoring unit for monitoring the temperature in the liquid inlet pipe 110, and the cooler 310 can cool the methyl acrylate liquid in the liquid inlet pipe 110; when the storage system feeds liquid into the liquid storage tank 1 through the liquid inlet pipe 110, the control unit adjusts the cooling efficiency of the cooler 310 on the methyl acrylate in the liquid inlet pipe 110 according to the liquid inlet temperature obtained by the third temperature monitoring unit; by monitoring the temperature of the inlet liquid and pre-cooling the inlet liquid in the liquid inlet pipe 110, the methyl acrylate in the liquid storage tank 1 can be prevented from having a large temperature change during the inlet state.

[0085] In an embodiment of the present invention, the liquid outlet end of the cooling unit 3 is also connected to a pre-cooling pipe 730, and the liquid outlet end of the pre-cooling pipe 730 is connected to the liquid inlet pipe 110 with an adjustable opening, and the third temperature monitoring unit is located downstream of the liquid outlet end of the pre-cooling pipe 730; in the process of the storage system feeding liquid into the liquid storage tank 1 through the liquid inlet pipe 110, the pre-cooling pipe 730 is controlled to open at a preset opening, and the control unit adjusts the opening of the pre-cooling pipe 730 according to the liquid inlet temperature obtained by the third temperature monitoring unit to adjust the cooling efficiency of the cooler 310 on the methyl acrylate in the liquid inlet pipe 110.

[0086] In an embodiment of the present invention, when the storage system is feeding liquid into the liquid storage tank 1 through the liquid inlet pipe 110, the control unit determines whether the liquid inlet temperature is less than or equal to a preset third temperature threshold. If not, the opening of the pre-cooling pipe 730 is increased; if so, the current opening is maintained.

[0087] In an embodiment of the present invention, a storage system for methyl acrylate is also introduced, which is controlled by the control method for the storage system for methyl acrylate as described above.

[0088] In an embodiment of the present invention, the storage system includes a liquid storage tank 1, which has a liquid storage cavity inside and is equipped with a liquid inlet pipe 110 and a liquid outlet pipe 120 connected to the liquid storage cavity; an air supply unit 2, which is connected to the storage cavity through an air inlet pipe 210, and is used to provide the methyl acrylate liquid stored in the storage cavity with an inhibitory gas; a main exhaust pipe 510, which is connected to the liquid storage cavity, and is used to discharge the free gas in the liquid storage cavity that is not dissolved in the methyl acrylate liquid.

[0089] Through the above-mentioned arrangement, by setting up a storage system with a liquid storage tank 1, the supplier can use a tank truck to transport methyl acrylate, and there is no need for secondary transshipment during production and use, which improves the safety factor of the material during storage and transportation and reduces the cost of use; and, by introducing an inhibitory gas, the self-polymerization of methyl acrylate can be effectively prevented to achieve long-term storage of methyl acrylate, and the inhibitory gas will not reduce the purity of the material, thereby accelerating the subsequent polymerization reaction rate.

[0090] It should be noted that the inhibitory gas is a single gas or a mixed gas containing oxygen and / or nitrogen and / or an inert gas; preferably, the inhibitory gas is a mixed gas containing oxygen and / or nitrogen.

[0091] In an embodiment of the present invention, the outlet end of the air inlet pipe 210 is close to the bottom of the liquid storage chamber; so that the anti-agglomeration gas input into the liquid storage tank 1 moves upward from a position close to the bottom of the tank to the liquid surface, thereby increasing the contact time between the anti-agglomeration gas and the material and improving the gas dissolution efficiency.

[0092] In an embodiment of the present invention, the liquid outlet end of the liquid inlet pipe 110 is arranged near the bottom of the liquid storage chamber, and the air outlet end of the air inlet pipe 210 is lower than the liquid outlet end of the liquid inlet pipe 110; preferably, the liquid inlet pipe 110 is connected to the top of the liquid storage tank 1, passes through the top wall of the liquid storage tank 1 and extends from top to bottom into the liquid storage chamber.

[0093] In an embodiment of the present invention, the liquid inlet end of the liquid outlet pipe 120 is connected to the bottom wall of the liquid storage chamber; preferably, the gas outlet end of the air inlet pipe 210 and the liquid inlet end of the liquid storage pipe are arranged at a certain distance in the horizontal direction; to avoid negative pressure generated near the bottom of the liquid storage chamber during the liquid outlet pipe 120 discharging liquid, the negative pressure will directly suck the anti-agglomeration gas output by the air inlet pipe 210 into the air outlet pipe.

[0094] In an embodiment of the present invention, a bubbling level gauge 211 is connected in series to the air inlet pipe 210 so that when the air inlet pipe 210 is passing the inhibitory gas into the liquid storage tank 1, the bubbling level gauge 211 can measure the liquid level in the liquid storage tank 1 and regulate the air intake flow of the air supply unit 2 according to the liquid level.

[0095] In the embodiment of the present invention, a first liquid level monitoring unit 130 is provided on the liquid storage tank 1 ; the actual liquid level height monitored by the first liquid level monitoring unit 130 and the bubble level gauge 211 are calibrated with each other to improve the monitoring accuracy of the liquid level in the liquid storage tank 1 .

[0096] In an embodiment of the present invention, the air outlet end of the air inlet pipe 210 and the first liquid level monitoring unit 130 are arranged at a certain distance in the horizontal direction; preferably, the measuring positions of the air inlet pipe 210 and the first liquid level monitoring unit 130 are located on both sides of a vertical midline of the liquid storage tank 1; further preferably, the liquid outlet end of the air inlet pipe 210 is arranged close to the chamber wall on one side of the liquid storage cavity, and the measuring position of the first liquid level monitoring unit 130 is located near the chamber wall on the opposite side of the liquid storage cavity; so that the bubble level gauge 211 and the first liquid level monitoring unit 130 are arranged at a distance from one end, so that the first liquid level monitoring unit 130 and the bubble level gauge 211 respectively monitor the liquid level heights of the material at different horizontal positions, so as to improve the monitoring accuracy of the material level in the liquid storage cavity.

[0097] In an embodiment of the present invention, the first liquid level monitoring unit 130 includes a first liquid level gauge 131, which is connected to a first high measuring tube 132 and a first low measuring tube 133. The liquid inlet ends of the first high measuring tube 132 and the first low measuring tube 133 are respectively connected to the liquid storage cavity of the liquid storage tank 1, and the liquid inlet end of the first high measuring tube 132 is higher than the liquid inlet end of the first low measuring tube 133.

[0098] In an embodiment of the present invention, the height position of the liquid outlet end of the liquid inlet pipe 110 is lower than the height of the liquid inlet end of the first low measuring tube 133; so that when the first liquid level monitoring unit 130 determines that the liquid level has reached the lowest alarm level, the liquid level of methyl acrylate in the liquid storage tank 1 is still higher than the liquid outlet end of the liquid inlet pipe 110, thereby preventing the liquid outlet end of the liquid outlet pipe 120 from being higher than the liquid surface, causing the gas in the liquid storage tank 1 to overflow along the liquid outlet pipe 120 in reverse flow, and preventing the methyl acrylate discharged from the liquid outlet end of the liquid storage pipe from having to undergo a period of free fall before impacting the material stored in the liquid storage tank 1, causing the material to splash and adhere to the chamber wall around the liquid storage cavity.

[0099] In the embodiment of the present invention, the height position of the gas outlet end of the gas outlet pipe is lower than the height position of the liquid inlet end of the first low measuring tube 133 .

[0100] In an embodiment of the present invention, the gas supply unit 2 includes a gas tank 220, which is connected to the liquid storage chamber through an air inlet pipe 210; a plurality of gas supply devices 221, which respectively store different types of gases, and each gas supply device 221 is respectively connected to the gas tank 220; a mixed gas containing a suitable oxygen concentration and / or nitrogen concentration is prepared by introducing a plurality of gases into the gas tank 220 for mixing, so that the gas supply unit 2 can adaptively adjust the content of oxygen and / or nitrogen and / or inert gas in the mixed gas according to the liquid level and operating status of the liquid storage pipe.

[0101] In the embodiment of the present invention, the gas supply devices 221 are respectively configured with gas supply pipes 223, and each gas supply pipe 223 is respectively connected to a gas mixer 222. The gas mixer 222 is used to fully mix the various types of gases introduced, and the gas outlet of the gas mixer 222 is connected to the gas storage tank 220 through a mixing pipe 224. By setting the gas mixer 222, the gas output by each gas supply device 221 is fully mixed by the gas mixer 222 before entering the gas storage tank 220, so as to reduce the density difference between the gas entering the gas storage tank 220 and the gas contained in the gas storage tank 220, so as to avoid the gas stratification in the gas storage tank 220 caused by the large difference between the gas provided by each gas supply device 221 and the gas contained in the gas storage tank 220 after entering the gas storage tank 220.

[0102] In the embodiment of the present invention, at least part of the air supply device 221 is a barrel-shaped air supply barrel, and the air supply barrel is detachably connected to the corresponding air supply pipe 223.

[0103] In the embodiment of the present invention, at least part of the gas supply device 221 is a can-shaped gas supply tank, and the gas supply tank is fixedly connected to the corresponding gas supply pipe 223.

[0104] In the embodiment of the present invention, at least part of the air supply device 221 is an air supply fan, and the air supply fan runs at a high speed to pass air into the corresponding air supply pipe 223.

[0105] In an embodiment of the present invention, at least two air supply devices 221 provide compressed oxygen and / or oxygen-containing compressed gas, and the air outlet end of the air supply pipe 223 connected to one air supply device 221 is connected to the pipe wall of the air supply pipe 223 connected to the other air supply device 221, and the air outlet end of the air supply pipe 223 connected to the other air supply device 221 is connected to the gas mixer 222; preferably, one of the air supply devices 221 provides factory air, and the factory air is used to store compressed air for various equipment and processes inside the system; the other air supply device 221 provides instrument air, and the instrument air is used to drive compressed air for instruments and control equipment; that is, the two air supply devices 221 that provide oxygen are basic devices that need to be set up when the factory is built, and are not additional devices, thereby reducing the cost of system equipment.

[0106] In an embodiment of the present invention, nitrogen is stored in a gas supply device 221, so that a mixed gas containing oxygen and nitrogen is stored in the gas storage tank 220. Although compressed air can achieve the effect of inhibiting the polymerization of methyl acrylate at a lower operating cost, since oxygen can only inhibit the polymerization of methyl acrylate at low temperatures, when the temperature rises, oxygen will promote the self-polymerization of methyl acrylate. When the cooling equipment of methyl acrylate fails or the temperature of methyl acrylate rises unexpectedly before participating in the polymerization reaction, the self-polymerization of methyl acrylate may be accelerated. The above-mentioned problem can be avoided by appropriately increasing the amount of nitrogen dissolved in methyl acrylate.

[0107] In an embodiment of the present invention, the storage system is equipped with a cooling unit 3 for reducing the temperature of the methyl acrylate liquid in the liquid storage tank 1; by providing a cooler 310, the temperature of the methyl acrylate in the system is reduced to prevent the methyl acrylate from volatilizing faster due to the increase in temperature, and to prevent the temperature from being too high, causing oxygen to lose its inhibitory effect on methyl acrylate.

[0108] In the embodiment of the present invention, the cooling unit 3 includes a cooler 310, and a material channel for methyl acrylate to pass through and a refrigerant channel for refrigerant to pass through are provided in the cooler 310; the inlet and outlet of the material channel are respectively connected to the liquid storage tank 1; so that the cooler 310 circulates and cools the methyl acrylate in the liquid storage tank 1, so that the methyl acrylate in the liquid storage tank 1 is always kept at a suitable low temperature;

[0109] Alternatively, the material channel is connected in series to the liquid inlet pipe 110, so that after the methyl acrylate enters the storage system through the liquid inlet pipe 110, it is first cooled by the cooler 310 before entering the liquid storage tank 1, so as to prevent the methyl acrylate from entering the storage system at a high temperature, resulting in a large temperature change of the methyl acrylate in the area near the liquid outlet end of the liquid inlet pipe 110 in the liquid storage tank 1, causing the methyl acrylate in this area to self-polymerize.

[0110] In an embodiment of the present invention, the storage system is further provided with a purge unit 4 for providing a compressed gas purge device, and the gas outlet end of the purge unit 4 is connected to a first purge pipe 421 and a second purge pipe 422, and the gas outlet ends of the first purge pipe 421 and the second purge pipe 422 are respectively connected to the liquid inlet pipe 110 in a switchable manner; the liquid inlet pipe 110 is connected to a first exhaust branch pipe 520 which can be switched on and off, and the gas outlet end of the first exhaust branch pipe 520 is connected to the main exhaust pipe 510.

[0111] Since liquid passes through the liquid inlet pipe 110 only when methyl acrylate is transported to the liquid storage tank 1, there is no material in the pipe under normal circumstances, so that the methyl acrylate remaining in the liquid inlet pipe 110 is easily solidified and crystallized on the pipe wall, resulting in blockage of the liquid inlet pipe 110; through the above-mentioned arrangement, the liquid inlet pipe 110 is purged by adding a purge unit 4 to clean the methyl acrylate remaining in the liquid inlet pipe 110, thereby preventing the occurrence of the above-mentioned problem; and by setting the first exhaust branch pipe 520, the purged gas containing methyl acrylate is sent to the exhaust pipe to prevent pollution to the external atmosphere.

[0112] In one embodiment of the present invention, a liquid inlet pump 111 is connected in series to the liquid inlet pipe 110, the air outlet end in the purge unit 4 is connected to the upstream or downstream of the liquid inlet pump 111, and the air inlet end of the first exhaust branch pipe 520 is connected to the downstream or upstream of the liquid inlet pump 111; so as to clean the pump cavity of the liquid inlet pump 111 and prevent the liquid inlet pump 111 from being blocked and malfunctioning.

[0113] In another embodiment of the present invention, the outlet end of the purge unit 4 is connected to the first purge pipe 421 and the second purge pipe 422, and the outlet ends of the first purge pipe 421 and the second purge pipe 422 are respectively connected to the upstream and downstream of the liquid inlet pump 111, and the outlet end of the first exhaust branch pipe 520 is connected to the first branch pipe 521 and the second branch pipe 522, and the inlet ends of the first branch pipe 521 and the second branch pipe 522 are respectively connected to the upstream and downstream of the liquid inlet pump 111, and the first purge pipe 421 is located at the first branch pipe. 521 is upstream, and the second purge pipe 422 is downstream of the second branch pipe 522; preferably, the first purge pipe 421, the second purge pipe 422, the first branch pipe 521 and the second branch pipe 522 are respectively provided with air valves; through the corresponding switches and corresponding air valves, purge passages in different directions are formed in the pump chambers of the liquid inlet pipe 110 and the liquid inlet pump 111, so that the purge unit 4 forms a forward and reverse purge cleaning of the liquid inlet pump 111, further improving the purge effect of the liquid inlet pump 111.

[0114] In an embodiment of the present invention, the purge unit 4 includes a hose station 410, an air outlet end of the hose station 410 is connected to a liquid inlet purge pipe 420, and an air outlet end of the liquid inlet purge pipe 420 is connected to a first purge pipe 421 and a second purge pipe 422; preferably, the air inlet end of the hose station 410 is connected to an air supply device 221; further preferably, the air inlet end of the hose station 410 is connected to an air supply device 221 storing factory air.

[0115] In an embodiment of the present invention, the first liquid level gauge 131 is connected to the second exhaust branch pipe 530, and the outlet end of the second exhaust branch pipe 530 is connected to the exhaust main pipe; so that the storage system can regularly purge the first liquid level gauge 131 and discharge the purged gas into the main exhaust pipe 510; preferably, the air inlet end of the second exhaust branch pipe 530 is connected to the first high measuring pipe 132; preferably, an air valve is provided on the second exhaust branch pipe 530; so as to disconnect the passage of the second exhaust branch pipe 530 when no purging is performed, so as to prevent materials from entering the main exhaust pipe 510 along the second exhaust branch pipe 530.

[0116] In an embodiment of the present invention, the top wall of the gas storage tank 220 is configured as a pointed top that bulges upward from the periphery to the center, and the air inlet end of the main exhaust pipe 510 is connected to the highest point of the top wall of the gas storage tank 220; part of the gas input by the air inlet pipe 210 and the volatilized gas of methyl acrylate are discharged through the air inlet end of the main exhaust pipe 510 at the highest position of the top wall.

[0117] In an embodiment of the present invention, an explosion-proof manhole connected to the gas storage chamber is opened on the peripheral side wall of the liquid storage tank 1; so that the staff can enter the liquid storage chamber through the explosion-proof manhole to clean the chamber wall of the liquid storage chamber or repair and replace other functional components in the liquid storage chamber.

[0118] In an embodiment of the present invention, a breathing valve is provided on the liquid storage tank 1 so that the outside air is greater than the liquid storage chamber and can be connected and disconnected; when the liquid storage chamber is in a negative pressure state, the breathing valve is opened by electronic control or automatically opened under the action of negative pressure, and the outside atmosphere is introduced into the liquid storage tank 1 to balance the air pressure; preferably, the breathing valve is a one-way valve structure that conducts one-way from the outside atmosphere to the liquid storage chamber.

[0119] In the embodiment of the present invention, the air intake pipe 210 extends from top to bottom through the top wall of the air storage tank 220, and the position of the air storage tank 220 communicating with the air intake pipe 210 and the position of the air storage tank 220 communicating with the exhaust pipe are arranged at a certain distance in the horizontal direction.

[0120] In an embodiment of the present invention, the storage system includes a scrubbing tower 5, and the gas storage end of the main exhaust pipe 510 is connected to the scrubbing tower 5 for purifying the introduced gas; by scrubbing the introduced gas before discharging it, the waste gas containing methyl acrylate generated by the system is prevented from polluting the atmosphere, which is environmentally friendly.

[0121] In the embodiment of the present invention, the scrubber 5 includes a hollow tower body 501, the lower area of ​​the tower body 501 is connected to the gas outlet end of the main exhaust pipe 510, and the top of the tower body 501 is provided with an exhaust pipe; the lower area of ​​the tower body 501 is provided with a circulating liquid storage tank, and the middle area is provided with a spray pipe 542, and the part of the spray pipe 542 located in the tower body 501 is provided with a spray hole; the tower body 501 is provided with a circulating pipe 541, and the liquid inlet end of the circulating pipe 541 is connected to the circulating liquid storage tank. The liquid outlet end is connected with the liquid inlet end of the spray pipe 542, and a circulating spray pump 540 is arranged on the circulating pipe 541; the gas outlet end of the main exhaust pipe 510 is located above the circulating liquid pool; so that the circulating spray pump 540 pumps the circulating liquid in the circulating liquid storage tank into the spray pipe 542, and the spray pipe 542 sprays the circulating liquid through the spray hole. The circulating liquid contacts the gas flowing upward, absorbs methyl acrylate and other substances that may pollute the atmosphere in the gas, thereby achieving a gas washing effect.

[0122] In the embodiment of the present invention, the portion of the spray pipe 542 located in the tower body 501 extends in the horizontal direction, and the spray holes are distributed on the lower side wall of the portion.

[0123] In an embodiment of the present invention, a porous first filler 503 is arranged below the spray pipe 542, and the first filler 503 is located above the gas outlet end of the main exhaust pipe 510; the circulating water flows downward along the pores of the first filler 503, and the gas introduced into the tower body 501 by the main exhaust pipe 510 flows upward through the pores of the first filler 503, so as to increase the contact area and contact time between the circulating water and the gas by the isomorphic first filler 503, thereby improving the gas washing effect of the gas washing tower 5.

[0124] In the embodiment of the present invention, a second liquid level monitoring unit 550 is provided on the side wall of the lower area of ​​the tower body 501 . The second liquid level monitoring unit 550 is located below the main exhaust pipe 510 to monitor the liquid level in the circulating spray pool.

[0125] In an embodiment of the present invention, the second liquid level monitoring unit 550 includes a second liquid level gauge 551, which is connected to a second high measuring tube 552 and a second low measuring tube 553. The liquid inlet ends of the second high measuring tube 552 and the second low measuring tube 553 are respectively connected to the tower body 501, and the liquid inlet end of the second high measuring tube 552 is higher than the liquid inlet end of the second low measuring tube 553.

[0126] In the embodiment of the present invention, the height of the position where the liquid inlet end of the circulation tube 541 is located is lower than the height of the position where the liquid inlet end of the second lower measuring tube 553 is located.

[0127] In the embodiment of the present invention, a liquid level monitoring unit 560 with a visual display of the liquid level is provided on the side wall of the lower area of ​​the tower body 501. The liquid level monitoring unit 560 is located below the main exhaust pipe 510 to monitor the liquid level height in the circulating spray pool.

[0128] In an embodiment of the present invention, the observation liquid level monitoring unit 560 includes an observation part 561 with a transparent observation window, and the observation part 561 is connected to an observation high measuring tube 562 and an observation low measuring tube 563. The liquid inlet ends of the observation high measuring tube 562 and the observation low measuring tube 563 are respectively connected to the tower body 501, and the liquid inlet end of the observation high measuring tube 562 is higher than the liquid inlet end of the second high measuring tube 552, and the liquid inlet end of the observation low measuring tube 563 is lower than the liquid inlet end of the second low measuring tube 553; when the second monitoring unit detects that the liquid level of the circulating spray pool is too high or too low, the staff can intuitively check the specific situation of the liquid level outside the tower body 501 through the observation liquid level monitoring unit 560, and when the liquid level is higher than the second high measuring tube 552 or lower than the second low measuring tube 553, the specific position of the liquid level can also be checked through the observation liquid level monitoring unit 560, so that the staff can determine the solution in time.

[0129] In the embodiment of the present invention, the liquid inlet end of the circulation tube 541 is lower than the liquid inlet end of the second low measurement tube 553 , and higher than the liquid inlet end of the observation low measurement tube 563 .

[0130] In an embodiment of the present invention, the scrubbing tower 5 is provided with a water supply pipe 505, the liquid outlet end of which is connected to the upper area of ​​the tower body 501, so as to allow desalted water to be introduced into the tower body 501 to replenish or renew the circulating water in the tower body 501; preferably, the part of the water supply pipe 505 located inside the tower body 501 extends in a horizontal direction, and a plurality of spray holes are distributed on the lower side wall of the water supply pipe 505.

[0131] In the embodiment of the present invention, a porous second filler 504 is provided in the upper region of the tower body 501 . The second filler 504 is located below the liquid outlet of the water supply pipe 505 and above the liquid outlet of the circulation pipe 541 .

[0132] In an embodiment of the present invention, the circulation pipe 541 is connected to a switchable waste water pipe 543 downstream of the circulation spray pump 540, so that when the content of methyl acrylate contained in the circulating water in the tower body 501 or the content of substances that can be absorbed by the circulating liquid in the gas is too high, the waste water pipe 543 is opened to discharge part of the circulating liquid, and new circulating liquid is added through the water replenishing pipe 505 to ensure the gas washing efficiency of the circulating liquid on the gas.

[0133] In the embodiment of the present invention, a waste pipe 502 is disposed at the bottom of the tower body 501 , and the waste pipe 502 is connected to the bottom of the circulating spray pool.

[0134] In an embodiment of the present invention, the liquid outlet ends of the waste pipe 502 and the wastewater pipe 543 are respectively connected to the sewage inlet pipe of a sewage treatment plant; the sewage generated by the scrubbing tower 5 is treated by the sewage treatment plant built by the factory or other partners before being discharged after meeting the standards to prevent environmental pollution.

[0135] In an embodiment of the present invention, the storage system includes a liquid storage tank 1 having a liquid storage cavity therein for containing methyl acrylate liquid; a connecting pipe 720, wherein the liquid outlet end of the connecting pipe 720 is selectively connected to at least two connecting branch pipes 721, and the liquid outlet end of each connecting branch pipe 721 is respectively connected to the liquid storage tank 1, and the liquid outlet ends of each connecting pipe 720 are respectively located at different heights.

[0136] Through the above-mentioned arrangement, by setting up a storage system with a liquid storage tank 1, the supplier can use a tank truck to transport methyl acrylate, and there is no need for secondary transportation during production and use, which improves the safety factor of the material during storage and transportation and reduces the cost of use; and, by setting a connecting branch pipe 721 located at different heights in the liquid storage tank 1, the methyl acrylate material is introduced into the liquid storage tank 1 at different heights, and the methyl acrylate material in the liquid storage tank 1 is disturbed by liquid, so as to achieve the purpose of stirring the liquid, avoid the self-polymerization and precipitation of methyl acrylate due to long-term standing, so that the liquid storage tank 1 can store materials for a long time.

[0137] In one embodiment of the present invention, the liquid outlet end of each connecting tube 720 is arranged flush with the chamber wall of the liquid storage chamber.

[0138] In another preferred embodiment of the present invention, the liquid outlet end of each connecting branch pipe 721 extends to the inside of the liquid storage cavity and protrudes from the chamber wall of the liquid storage cavity; preferably, the liquid outlet end of each connecting branch pipe 721 extends along the radial direction corresponding to the liquid storage cavity; by making the liquid outlet end of each connecting branch pipe 721 close to the center of the liquid storage tank 1, the disturbance effect of each connecting branch pipe 721 is enhanced to further prevent methyl acrylate from self-polymerization.

[0139] In an embodiment of the present invention, at least part of the connecting branch pipes 721 are first connecting branch pipes 721a with the liquid outlet end tilted upward; preferably, other connecting branch pipes 721 are second connecting branch pipes 721b with the liquid outlet end extending horizontally, and each first connecting branch pipe 721a is respectively located above all second connecting branch pipes 721b; by setting the first connecting branch pipe 721a with the liquid outlet end tilted upward, the methyl acrylate output by the first connecting branch pipe 721a can disturb the material located above, thereby achieving all-round disturbance of the material in the liquid storage tank 1; in addition, by making the first connecting branch pipe 721a located at the top, it is prevented that the methyl acrylate output by the first connecting branch pipe 721a and the methyl acrylate output by the second connecting branch pipe 721b interfere with each other and affect the stirring effect.

[0140] In an embodiment of the present invention, the inclination angle of the liquid outlet end of each first connecting branch pipe 721a ranges from 20 to 60 degrees; preferably, the inclination angle of the liquid outlet end of each first connecting branch pipe 721a ranges from 30 to 45 degrees; while ensuring the disturbance of the upper liquid, it is ensured that the methyl acrylate output by the first connecting branch pipe 721a has a sufficient horizontal speed, and its horizontal coverage area can be disturbed.

[0141] In an embodiment of the present invention, the liquid outlet end of the connecting pipe 720 is connected to a switching valve 723, and each outlet of the switching valve 723 is connected to each corresponding connecting branch pipe 721; the switching valve 723 is used to switch and connect each connecting branch pipe 721 to the connecting pipe 720, so that the system can adaptively adjust the opening and closing of each connecting branch pipe 721 according to different conditions in the liquid storage tank 1.

[0142] In an embodiment of the present invention, the switching valve 723 is a three-way valve structure, and the liquid inlet end of each first connecting branch 721a is respectively connected to a liquid outlet of the switching valve 723, and each second connecting branch 721b is respectively connected to the other liquid outlet of the switching valve 723; so that the switching valve 723 with a three-way valve structure can connect the connecting pipe 720 with all the first connecting branches 721a and / or the second connecting branches 721b by switching, so as to simplify the operation of the switching valve 723; preferably, the number of the first connecting branch 721a and the number of the second connecting branch 721b are respectively one.

[0143] In the embodiment of the present invention, the connecting pipes 720 are distributed on the chamber wall of the liquid storage chamber along the circumferential direction.

[0144] In an embodiment of the present invention, an injection device 724 is provided on the liquid outlet end of the first connecting branch pipe 721a, and a plurality of injection holes connected to the first connecting branch pipe 721a are distributed on the injection device 724; preferably, the sum of the passing areas of all the injection holes is smaller than the passing area of ​​the first connecting branch pipe 721a.

[0145] Through the above-mentioned arrangement, by arranging the injection device 724 on the first connecting branch pipe 721a, the methyl acrylate output from the first connecting branch pipe 721a is dispersed into multiple thin streams, which enter the liquid storage tank 1 in a scattered manner, thereby improving the turbulence range of the output methyl acrylate, so that when there are more materials in the liquid storage tank 1, the materials at various positions in the liquid storage tank 1 can still be subjected to liquid turbulence respectively; in addition, by limiting the total passing area of ​​the injection device 724, the methyl acrylate can be accelerated to enter the liquid storage tank 1, thereby improving the speed and turbulence range of each thin stream.

[0146] In the embodiment of the present invention, a cooling unit 3 is connected in series to the connecting pipe 720 for reducing the temperature of the methyl acrylate liquid flowing therethrough; a cooler 310 is provided to reduce the temperature of the methyl acrylate in the system to prevent the methyl acrylate from volatilizing faster due to the increase in temperature, and to prevent the oxygen from losing its inhibitory effect on methyl acrylate due to excessive temperature.

[0147] In an embodiment of the present invention, the cooling unit 3 includes a cooler 310, which is provided with a material channel for methyl acrylate to pass through and a refrigerant channel for a refrigerant with a temperature lower than that of methyl acrylate to pass through; the material channel is connected in series to the connecting pipe 720; and the temperature of methyl acrylate in the system is reduced by heat exchange with the refrigerant.

[0148] In an embodiment of the present invention, the cooler 310 is tilted upward from the liquid inlet end to the liquid outlet end of the material channel; preferably, the cooler 310 is tilted upward by 3-15°; by tilting the cooler 310, the self-polymerization of methyl acrylate can be avoided by avoiding the aggregation of methyl acrylate. In addition, by limiting the tilt angle of the cooler 310, the cooler 310 can be prevented from tilting too much, which will cause the methyl acrylate to consume a large amount of kinetic energy through the material channel and affect the disturbance effect on the material in the liquid storage tank 1.

[0149] In one embodiment of the present invention, the liquid outlet end of the liquid inlet pipe 110 is connected to the liquid inlet end of the connecting pipe 720, and the liquid inlet pipe 110 is connected to the liquid storage tank 1 through each connecting branch pipe 721; so that the storage system can perform efficient liquid disturbance on the material in the liquid storage tank 1 while taking in liquid, thereby preventing the self-aggregation and precipitation of the material in the liquid storage tank 1.

[0150] In another preferred embodiment of the present invention, the storage system includes a pumping device 710, the liquid inlet end of the pumping device 710 is connected to the liquid storage tank 1, and the liquid outlet end of the pumping device 710 is connected to the liquid inlet end of the connecting pipe 720 to form a circulation pipeline; so that the storage system can disturb the material in the liquid storage tank 1 through the formed circulation pipeline, and at the same time, the timing of liquid disturbance in the liquid storage tank 1 is no longer limited to the process of liquid injection into the liquid storage tank 1, but the material in the liquid storage tank 1 can be continuously disturbed at any time as needed; in addition, the circulation pipeline can circulate and cool the material in the liquid storage tank 1 to improve the cooling efficiency of the storage system.

[0151] In an embodiment of the present invention, the storage system includes a liquid inlet pipe 110 connected to the liquid storage tank 1, which is used to pass external methyl acrylate into the liquid storage tank 1; the liquid outlet end of the cooling unit 3 is also connected to the pre-cooling pipe 730, and the liquid outlet end of the pre-cooling pipe 730 is connected to the liquid inlet pipe 110; preferably, the pre-cooling pipe 730 is connected to the connecting pipe 720 downstream of the cooling unit 3; during the liquid inlet process of the liquid inlet pipe 110, part of the cooled methyl acrylate is passed into the liquid inlet pipe 110, so that the methyl acrylate in the liquid inlet pipe 110 is cooled by liquid mixing, so as to prevent the methyl acrylate in the liquid inlet pipe 110 from having a large temperature difference with the methyl acrylate in the liquid storage tank 1, resulting in the methyl acrylate in the liquid storage tank 1 near the liquid inlet pipe 110 self-polymerization after rapid heating.

[0152] In an embodiment of the present invention, the liquid outlet end of the liquid inlet pipe 110 is arranged near the bottom of the liquid storage chamber, and the height position of the liquid outlet end of the lowest connecting branch pipe 721 is lower than the height position of the liquid outlet end of the liquid inlet pipe 110; generally, the liquid level height of the material in the liquid storage tank 1 is at least higher than the liquid outlet end of the liquid inlet pipe 110, and the connecting branch pipe 721 is arranged lower than the liquid outlet end of the liquid inlet pipe 110 to disturb the material between the liquid outlet end of the liquid inlet pipe 110 and the bottom wall of the liquid storage chamber.

[0153] In the embodiment of the present invention, a liquid inlet pump 111 is connected in series to the liquid inlet pipe 110 , and a jacket for passing chilled water is provided on the liquid inlet pump 111 , so as to cool the methyl acrylate flowing through the jacket by heat exchange.

[0154] In an embodiment of the present invention, a jacket is provided on the pumping device 710 for passing chilled water, so as to cool the methyl acrylate flowing through it by heat exchange; so as to pre-cool the methyl acrylate before it enters the cooling unit 3, so as to prevent a large temperature difference between the methyl acrylate and the refrigerant in the cooling unit 3, which would cause the refrigerant in the cooling unit 3 to rise in temperature to a large extent, resulting in corrosion or structural problems, thereby affecting the cooling efficiency of the cooling unit 3 for methyl acrylate.

[0155] In an embodiment of the present invention, a liquid outlet branch 910 is connected to the connecting pipe 720 between the pumping device 710 and the cooling unit 3, which is used to output the material in the liquid storage tank 1; through switching control, part or all of the methyl acrylate extracted by the pumping device 710 can be discharged for use, and because the subsequent use process involves heating the methyl acrylate, it is output before it enters the cooling unit 3 to reduce energy waste.

[0156] In an embodiment of the present invention, the storage system is provided with at least two independent liquid storage tanks 1, each storage tank is respectively and one by one configured with a pumping device 710, a connecting pipe 720 and a liquid outlet branch pipe 910, and the liquid outlet end of each liquid outlet branch pipe 910 is respectively connected to the same liquid outlet main pipe 9, and the liquid outlet main pipe 9 is used to output methyl acrylate to subsequent equipment; by providing parallel liquid storage tanks 1, the maximum total storage volume of the storage system can be increased.

[0157] In an embodiment of the present invention, the liquid inlet pipe 110 includes a liquid inlet main pipe 112 and at least two liquid inlet branch pipes 113 connected to the liquid outlet end of the liquid inlet main pipe 112, and each liquid inlet branch pipe 113 is connected to each liquid storage tank 1 one by one; preferably, the liquid outlet end of each pre-cooling pipe 730 is connected to the liquid inlet branch pipe 113 one by one.

[0158] In the embodiment of the present invention, each liquid storage tank 1 is connected to the liquid inlet end of the liquid pumping device 710 through a liquid outlet pipe 120, and each liquid outlet pipe 120 is connected to a spare liquid outlet pipe 820 which can be switched on and off. The liquid outlet end of each spare liquid outlet pipe 820 is connected to the same spare liquid pumping device 810, and the liquid outlet end of the spare liquid pumping device 810 is connected to the liquid outlet main pipe 9. By arranging the spare liquid pumping device 810 and the spare liquid outlet pipe 820, when the liquid pumping device 710 corresponding to a liquid storage tank 1 fails, the corresponding spare liquid outlet pipe 820 is opened to connect the liquid storage tank 1 with the spare liquid pumping device 810, and methyl acrylate is output to the liquid outlet main pipe 9 through the spare liquid pumping device 810.

[0159] In an embodiment of the present invention, a transport device 6 adapted for a storage system for methyl acrylate as described above is also introduced. The transport device 6 is provided with a transport tank 610 for storing methyl acrylate liquid, and the liquid inlet pipe 110 of the storage system is detachably connected to the liquid outlet of the transport tank 610.

[0160] Through the above arrangement, the traditional method of transporting barreled methyl acrylate by tank trucks is replaced by directly transporting methyl acrylate by tank trucks, thereby reducing the transportation cost and the safety cost of secondary transshipment.

[0161] In an embodiment of the present invention, the liquid inlet pipe 110 includes a deformable connecting hose located at the liquid inlet end, and the liquid inlet end of the connecting hose is detachably connected to the liquid outlet of the transport tank 610 .

[0162] In the embodiment of the present invention, the transport device 6 is equipped with a 5°C-15°C circulating cooling system to reduce the temperature of the methyl acrylate in the transport tank 610 and prevent the methyl acrylate from self-polymerizing during transportation.

[0163] In an embodiment of the present invention, the storage system is configured with an unloading platform for positioning and parking the transport equipment 6; when the transport equipment 6 stops at the corresponding position of the unloading platform, the connecting hose is connected to the liquid outlet of the transport tank 610 of the transport equipment 6, and then the liquid inlet pump 111 is controlled to operate to pump the methyl acrylate in the transport tank 610 into the liquid storage tank 1.

[0164] In an embodiment of the present invention, a gas replenishment port is opened in the upper area of ​​the top or side wall of the transport tank 610; the storage system includes a gas replenishment unit 511, which is connected to the gas replenishment port of the transport tank 610 and is used to introduce gas into the transport tank 610 to balance the air pressure in the tank.

[0165] Through the above arrangement, the transport tank 610 is not connected to the outside atmosphere, so that during the process of the transport tank 610 outputting methyl acrylate to the liquid storage tank 1, air is supplied to the inside of the transport tank 610 through the air supply unit 511 to prevent the air pressure inside the transport tank 610 from being too low and affecting the liquid discharge efficiency;

[0166] In addition, the prior art usually connects the air supply port on the top of the transport tank 610 directly to the outside atmosphere. However, when it is applied to volatile methyl acrylate, not only will the methyl acrylate volatilize and pollute the outside atmosphere, but the outside atmosphere at normal temperature will cause the methyl acrylate in the transport tank 610 to heat up rapidly, resulting in accelerated self-polymerization of methyl acrylate. This embodiment uses the air supply pipe to isolate the transport tank 610 from the outside atmosphere while balancing the air pressure. At the same time, the temperature of the gas in the air supply pipe can be adjusted as needed, thereby avoiding the above-mentioned problems.

[0167] In an embodiment of the present invention, the air supply unit 511 includes an air supply pipe connected to the main exhaust pipe 510 and an air supply valve arranged on the air supply pipe, and the air outlet end of the air supply pipe is detachably connected to the air supply port of the transport tank 610.

[0168] Through the above arrangement, the gas exhausted from the main exhaust pipe 510 is passed into the transport tank 610. Since the gas in the main exhaust pipe 510 is mainly discharged from the liquid storage tank 1, the gas is a gas with a relatively low temperature. The gas contains inhibitory gas and methyl acrylate, so that when the gas contacts the methyl acrylate material in the transport tank 610, it will not cause the material to heat up. At the same time, the methyl acrylate contained in the gas can inhibit the volatilization efficiency of the material. In addition, the inhibitory gas in the gas can prevent the material in the transport tank 610 from self-aggregating.

[0169] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A control method for a storage system for methyl acrylate, characterized in that: The storage system includes: A liquid storage tank for storing methyl acrylate; A gas supply unit, used for providing an anti-agglomeration gas to the inner body of the liquid storage tank; The control unit is used to control the operation of the storage system. When methyl acrylate liquid is stored in the liquid storage tank, the control unit controls the gas supply unit to continuously provide the polymerization-inhibiting gas.

2. A control method for a storage system for methyl acrylate according to claim 1, characterized in that: The storage system is equipped with a concentration monitoring unit for monitoring the amount of dissolution of the inhibitor in the methyl acrylate liquid; During the operation of the gas supply unit, the concentration monitoring unit monitors the actual dissolved amount of the methyl acrylate liquid, and the control unit adjusts the gas flow rate of the gas supply unit and / or the concentration of the polymerization inhibitor in the gas according to the actual dissolved amount.

3. A control method for a storage system for methyl acrylate according to claim 2, characterized in that: During the operation of the gas supply unit, the control unit determines whether the actual dissolved amount is greater than or equal to a preset first dissolved amount threshold; If not, the gas supply unit increases the gas flow rate and / or increases the concentration of the polymerization inhibitor in the gas; Preferably, a second dissolution amount threshold greater than the first dissolution amount threshold is preset; after determining that the actual dissolution amount is greater than or equal to the first dissolution amount threshold, the control unit determines whether the actual dissolution amount is less than or equal to the second dissolution amount threshold; If not, the gas supply unit is controlled to reduce the gas flow rate and / or reduce the concentration of the polymerization inhibitor in the gas.

4. A control method for a storage system for methyl acrylate according to any one of claims 1 to 3, characterized in that: The storage system includes a cooling unit for reducing the temperature of the methyl acrylate liquid, and a first temperature monitoring unit for monitoring the temperature of the methyl acrylate liquid; When methyl acrylate liquid is stored in the liquid storage tank, the cooling unit starts to work, the first temperature monitoring unit works to obtain the actual temperature, and the control unit determines whether the actual temperature is less than or equal to a preset first temperature threshold; If not, improve the cooling efficiency of the cooling unit; Preferably, a second temperature threshold lower than the first temperature threshold is preset; after determining that the actual temperature is less than or equal to the first temperature threshold, the control unit determines whether the actual temperature is greater than or equal to the preset second temperature threshold; If so, the cooling efficiency of the cooling unit is reduced.

5. A control method for a storage system for methyl acrylate according to claim 4, characterized in that: The storage system includes a circulation pipeline connected to the liquid storage tank, and a liquid pumping device is connected in series on the circulation pipeline; the cooling unit is a cooler connected in series on the circulation pipeline, and a refrigerant channel for refrigerant to flow through is provided in the cooler; The control unit improves the cooling efficiency of the cooling unit by increasing the flow rate of methyl acrylate in the circulation pipeline and / or increasing the flow rate of the refrigerant and / or reducing the temperature of the refrigerant.

6. A control method for a storage system for methyl acrylate according to claim 5, characterized in that: The circulation pipeline includes at least two connecting branches which are connected to the liquid storage tank in an on-off manner, the liquid outlet ends of each connecting branch are respectively located at different heights, and a liquid level monitoring unit is arranged on the liquid storage tank; During the operation of the pumping device, the liquid level monitoring unit is controlled to monitor the actual liquid level of the liquid storage tank, and the control unit determines whether the actual liquid level is greater than or equal to a preset first liquid level height; If so, the higher connecting branch pipe is controlled to be connected; If not, the lower connecting branch pipe is controlled to be connected; Preferably, a second liquid level height lower than the first liquid level height is preset; when the actual liquid level is lower than the first liquid level height, the control unit determines whether the actual liquid level is lower than or equal to the second liquid level height; If so, the pumping device and the cooling unit are controlled to stop running.

7. The control method for a storage system for methyl acrylate according to claim 5, characterized in that: The storage system is also equipped with a second temperature monitoring unit for monitoring the temperature of the methyl acrylate liquid, and the monitoring end of the second temperature monitoring unit is arranged at a certain distance from the monitoring end of the first temperature monitoring unit; When methyl acrylate liquid is stored in the liquid storage tank, the control unit calculates the average value of the monitoring values ​​of each first temperature monitoring unit to obtain the actual temperature.

8. The control method for a storage system for methyl acrylate according to claim 7, characterized in that: When methyl acrylate liquid is stored in the liquid storage tank, the control unit calculates the absolute difference between the monitoring values ​​of the first temperature monitoring unit and the second temperature detection unit, and increases the flow rate of the circulation pipeline when the absolute difference is greater than a preset standard deviation.

9. A control method for a storage system for methyl acrylate according to any one of claims 4 to 8, characterized in that: The storage system is provided with a liquid inlet pipe connected to the liquid storage tank, and the liquid inlet pipe is provided with a third temperature monitoring unit for monitoring the temperature in the liquid inlet pipe, and the cooler can cool the methyl acrylate liquid in the liquid inlet pipe; When the storage system is feeding liquid into the liquid storage tank through the liquid inlet pipe, the control unit adjusts the cooling efficiency of the cooler on the methyl acrylate in the liquid inlet pipe according to the liquid inlet temperature obtained by the third temperature monitoring unit.

10. A storage system for methyl acrylate, characterized in that: The control method for a methyl acrylate storage system is adopted as described in any one of claims 1 to 9.

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