Production device and method of mixed sterilization gas of ethylene oxide and carbon dioxide

Abstract

The present application belongs to a kind of production device and method of mixed sterilization gas of ethylene oxide and carbon dioxide;Including ethylene oxide storage tank and liquid carbon dioxide storage tank, the outlet of ethylene oxide storage tank and the outlet of liquid carbon dioxide storage tank are connected with mixed sterilization gas filling unit respectively;Heat exchange unit is arranged in ethylene oxide storage tank, and the outlet of liquid carbon dioxide storage tank is connected with the pressure stabilizing port of ethylene oxide storage tank through heat exchange unit;Sterilization gas after filling can not only solve the nature defects of ethylene oxide, avoid the problem of flammable and explosive, but also realize the purpose of convenient transportation, ensure the proportion of each raw gas in product, maintain the temperature of ethylene oxide storage tank by liquid carbon dioxide skillfully, and make the carbon dioxide gas after heat exchange as pressure increasing protection gas for stabilizing the pressure of ethylene oxide storage tank, so as to avoid the defects of impurity gas in sterilization product gas.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sterilization gas production, and particularly relates to a production device and method of mixed sterilization gas of ethylene oxide and carbon dioxide. BACKGROUND

[0002] Ethylene oxide C2H4O (abbreviated as EO) is a broad-spectrum, high-efficiency, strong-penetration, and slightly-damaging disinfectant and sterilization agent for various objects, which can be used for fumigation disinfection or sterilization of various objects, especially for sterilization of disposable medical supplies, hygiene materials, and disinfection of fur industry. EO itself has a low boiling point, and its liquid and gas are both flammable substances that can rapidly gasify at room temperature. The gas is extremely easy to explode under high heat or spark ignition. Based on the above defects, ethylene oxide needs to be stored at low temperature in a storage tank, and the pressure in the ethylene oxide storage tank needs to be maintained to prevent explosion and other risks. Moreover, traditional EO is not suitable for long-distance transportation and has strong regionalism. SUMMARY

[0003] The present application aims to overcome the defects in the prior art and provide a production device and method of mixed sterilization gas of ethylene oxide and carbon dioxide.

[0004] The above technical purpose of the present application is achieved by the following technical scheme:

[0005] A production device of mixed sterilization gas of ethylene oxide and carbon dioxide comprises an ethylene oxide storage tank and a liquid carbon dioxide storage tank. The outlet of the ethylene oxide storage tank and the outlet of the liquid carbon dioxide storage tank are respectively connected with a mixed sterilization gas filling unit configured with different proportions. A heat exchange unit for cooling ethylene oxide is arranged in the ethylene oxide storage tank. The outlet of the liquid carbon dioxide storage tank is also connected with a pressure stabilizing port of the ethylene oxide storage tank through the heat exchange unit.

[0006] The present application is aimed at the defects of ethylene oxide itself by adding liquid-phase carbon dioxide into it for dilution mixing, so as to reduce the flammability and realize convenient transportation. The liquid-phase carbon dioxide is filled into the mixed sterilization gas filling unit, so that the sterilization gas can not only realize the purpose of accurately controlling the amount of the filled liquid-phase carbon dioxide, but also realize the accurate control of the proportion of ethylene oxide and carbon dioxide, and can help the diffusion of ethylene oxide in actual use, thereby playing the role of synergistic effect of sterilization gas. Further, the present application uses liquid-phase carbon dioxide as the heat exchange medium of the heat exchange unit in the ethylene oxide storage tank, so as to ensure that the ethylene oxide storage tank is in a reasonable temperature range, and the heat exchange medium after heat exchange is used as the pressurization protection gas of the ethylene oxide storage tank, so as to ensure that the ethylene oxide storage tank is in a reasonable pressure, avoid the defects of flammability and explosion, and avoid the introduction of impurity gas into the final sterilization product gas. The above device not only solves the nature defects of ethylene oxide itself, avoids the problems of flammability and explosion, but also realizes the purpose of convenient transportation, ensures the proportion of each raw material gas in the product, and maintains the temperature of the ethylene oxide storage tank by liquid carbon dioxide, and makes the carbon dioxide gas after heat exchange as the protection gas for stabilizing the pressure of the ethylene oxide storage tank, thereby avoiding the defects of not meeting the industry standard YY / T 0822-2011 due to the impurity gas in the sterilization product gas.

[0007] Preferably, a first four-way valve is arranged at the outlet of the liquid carbon dioxide storage tank, a second end of the first four-way valve is connected to the inlet of the heat exchange unit in the ethylene oxide storage tank through a first valve, the outlet of the heat exchange unit is connected to the pressure stabilizing port through a second valve and a third valve, and a top of the ethylene oxide storage tank is provided with an ethylene oxide recovery unit.

[0008] Preferably, the ethylene oxide recovery unit comprises an ethylene oxide recovery tank connected to the gas outlet at the top of the ethylene oxide storage tank, and a recovery heat exchange member is arranged in the ethylene oxide recovery tank; the gas outlet at the top of the ethylene oxide recovery tank is connected to a tail gas treatment device, and a reflux pipeline at the lower part of the ethylene oxide recovery tank is connected to a reflux liquid port of the ethylene oxide storage tank; a vent valve is arranged between the gas outlet at the top of the ethylene oxide storage tank and the ethylene oxide recovery tank.

[0009] Preferably, a second four-way valve is arranged between the second valve and the third valve; a third end of the first four-way valve is connected to the inlet of the recovery heat exchange member through a sixth valve, and the outlet of the recovery heat exchange member is connected to the third end of the second four-way valve through a seventh valve; the heat exchange unit and the recovery heat exchange member are both heat exchange coils.

[0010] Beneficial effects: The liquid carbon dioxide in the liquid carbon dioxide tank in the application can be used as one of the raw gas for filling the sterilization product gas, can be used as the heat exchange medium for adjusting the internal temperature of the ethylene oxide tank, can be used as the pressure protection gas for stabilizing the internal pressure of the ethylene oxide tank, can change the flammable and explosive properties of the ethylene oxide in the ethylene oxide tank and the final product, and can be used as the heat exchange medium in the recovery heat exchange part to reduce the temperature in the ethylene oxide recovery tank to achieve the purpose of recovering the ethylene oxide; the heat exchange unit and the recovery heat exchange part in the application can be conventional heat exchange equipment, preferably heat exchange coils, and further preferably heat exchange coils with fins to improve the heat exchange effect.

[0011] Preferably, the fourth end of the second four-way valve is connected to the carbon dioxide gas phase system pipe network through a fourth valve. The application also protects the recovery of the carbon dioxide gas used as the heat exchange medium to the carbon dioxide gas phase system pipe network to achieve the feature of fully utilizing the carbon dioxide.

[0012] Preferably, the fourth end of the first four-way valve is connected to the mixed sterilization gas filling unit through a carbon dioxide low-temperature liquid pump and a fifth valve.

[0013] Preferably, the mixed sterilization gas filling unit includes at least one mixed sterilization gas filling part, and the mixed sterilization gas filling part includes a mixed sterilization gas cylinder, the inlet of the mixed sterilization gas cylinder is connected to the outlet of the filling busbar, the first inlet of the filling busbar is connected to the outlet of the ethylene oxide tank through a first filling row valve and an outlet valve, and the second inlet of the filling busbar is connected to the outlet of the fifth valve through a second filling row valve.

[0014] The application also includes a PLC control system, the signal input end of the PLC control system is connected to the tank temperature sensor, the tank pressure sensor, the recovery tank temperature sensor, the filling pipeline pressure transmitter, and the electronic scale respectively; the signal output end of the PLC control system is connected to the first valve, the second valve, the third valve, the vent valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the first filling row valve, and the second filling row valve respectively; the tank temperature sensor and the tank pressure sensor are connected to the ethylene oxide tank respectively; the recovery tank temperature sensor is connected to the ethylene oxide recovery tank; the filling pipeline pressure transmitter is arranged on the carbon dioxide filling pipeline between the fifth valve and the second filling row valve; and the electronic scale is arranged at the bottom of the mixed sterilization gas cylinder.

[0015] The application also provides a method for producing the production device using the mixed sterilization gas of ethylene oxide and carbon dioxide, which includes an ethylene oxide storage method and a filling method.

[0016] a. The ethylene oxide storage method includes the following steps:

[0017] Step 1: The tank temperature sensor and the tank pressure sensor monitor the temperature and pressure conditions in the ethylene oxide tank in real time, and transmit the temperature and pressure data to the PLC control system;

[0018] Step 2: When the temperature data detected by the tank temperature sensor exceeds the preset threshold, the PLC control system controls the opening degree of the first valve and the second valve, so that the liquid carbon dioxide in the liquid carbon dioxide tank enters the heat exchange unit through the first valve to exchange heat with the ethylene oxide in the ethylene oxide tank, so that the temperature data detected by the tank temperature sensor returns to the preset threshold;

[0019] Step 3: When the pressure data detected by the tank pressure sensor is higher than the pressure preset threshold, the PLC control system controls the opening of the vent valve, so that the gas in the ethylene oxide tank enters the ethylene oxide recovery tank through the vent valve to release pressure;

[0020] Step 4: The recovery tank temperature sensor detects the temperature in the ethylene oxide recovery tank in real time, and transmits the temperature data to the PLC control system. The PLC control system controls the temperature of the recovery heat exchange member by adjusting the opening degree of the sixth valve and the seventh valve, so that the temperature in the ethylene oxide recovery tank is controlled within-10℃~0℃; The cooled liquid phase is ethylene oxide, which enters the ethylene oxide tank through the reflux liquid port, and the cooled gas phase enters the tail gas treatment device through the gas phase outlet at the top of the ethylene oxide recovery tank for treatment;

[0021] Step 5: When the pressure data detected by the tank pressure sensor is lower than the pressure preset threshold, and at the same time, the liquid carbon dioxide in the liquid carbon dioxide tank enters the heat exchange unit in step 2, the PLC control system controls the fourth valve to be closed, and the second valve and the third valve to be opened, so that the heat exchanged carbon dioxide enters the ethylene oxide tank as a pressurizing gas and makes the pressure data detected by the tank pressure sensor be at the preset threshold;

[0022] Step 6: When the pressure data detected by the tank pressure sensor is lower than the pressure preset threshold, and at the same time, the liquid carbon dioxide in the liquid carbon dioxide tank enters the recovery heat exchange member in step 4, the PLC control system controls the fourth valve to be closed, and the seventh valve and the third valve to be opened, so that the heat exchanged carbon dioxide enters the ethylene oxide tank as a pressurizing gas and makes the pressure data detected by the tank pressure sensor be at the preset threshold;

[0023] Step 7: When the pressure data detected in the tank pressure sensor is lower than the pressure preset threshold value, and the heat exchange unit is not used for heat exchange, the PLC control system controls the second valve and the seventh valve to be closed, and the fourth valve and the third valve to be opened. The carbon dioxide in the carbon dioxide gas phase system pipe network enters the ethylene oxide tank as a pressurizing gas of the ethylene oxide tank and makes the pressure data detected in the tank pressure sensor be at the preset threshold value.

[0024] Step 8: When the pressure data detected in the tank pressure sensor is at the pressure preset threshold value, the carbon dioxide passing through the second valve in step 2 and / or the carbon dioxide passing through the seventh valve in step 4 enters the carbon dioxide gas phase system pipe network through the fourth valve for use in other gas-consuming sections.

[0025] b. The filling method is used for filling ethylene oxide and carbon dioxide in different proportions, including the following steps:

[0026] Step 1: The ethylene oxide in the ethylene oxide tank enters the mixed sterilization gas cylinder through the outlet valve, the first filling discharge valve and the filling busbar.

[0027] Step 2: During the filling of the mixed sterilization gas cylinder by the ethylene oxide tank in step 1, the electronic scale weighs the mixed sterilization gas cylinder and transmits the weighing data to the PLC control system. When the ethylene oxide filling weight reaches the predetermined value, the PLC control system controls the first filling discharge valve corresponding to the mixed sterilization gas cylinder to be closed.

[0028] Step 3: When the ethylene oxide filling is completed, the fifth valve and the second filling discharge valve are opened, and the carbon dioxide low-temperature liquid pump is started. The liquid carbon dioxide in the liquid carbon dioxide storage tank enters the mixed sterilization gas cylinder through the third end of the first three-way valve, the carbon dioxide low-temperature liquid pump, the fifth valve, the second filling discharge valve and the filling busbar.

[0029] Step 4: The filling pipeline pressure transmitter detects the pressure in the carbon dioxide filling pipeline in real time. When the pressure in the carbon dioxide filling pipeline is <15 MPa, the liquid carbon dioxide in the liquid carbon dioxide storage tank is normally filled into the mixed sterilization gas cylinder. When the pressure in the carbon dioxide filling pipeline is ≥15 MPa, the PLC control system controls the fifth valve to be closed, and the liquid phase carbon dioxide of the carbon dioxide low-temperature liquid pump is returned to the self-circulation protection liquid pump body.

[0030] Step 5: During the normal filling of the liquid carbon dioxide, the electronic scale weighs the mixed sterilization gas cylinder and transmits the weighing data to the PLC control system. When the liquid carbon dioxide filling weight reaches the predetermined value, the PLC control system controls the second filling discharge valve corresponding to the mixed sterilization gas cylinder to be closed.

[0031] Preferably, the temperature preset threshold of the ethylene oxide storage tank 1 in the ethylene oxide storage method is -10℃-10℃; the pressure preset threshold of the ethylene oxide storage tank 1 in the ethylene oxide storage method is 0.6-0.8 MPa; and the weight ratio of ethylene oxide to carbon dioxide in the filling method is 10-95:90-5.

[0032] The method in the application comprises an ethylene oxide storage method and a filling method. The storage method is based on safe storage of ethylene oxide, and is characterized by full use of carbon dioxide. Specifically, liquid-phase carbon dioxide is used as the heat exchange medium of the heat exchange unit and the heat recovery unit. The temperature of the ethylene oxide storage tank and the ethylene oxide recovery tank is adjusted to ensure that the ethylene oxide in the ethylene oxide storage tank is in a long-term safe storage state and the ethylene oxide that escapes to the ethylene oxide recovery tank is fully recovered. The heat-exchanged heat exchange medium can be used as the pressurizing protection gas of the ethylene oxide storage tank to stabilize the pressure of the ethylene oxide storage tank. The above process can fully use carbon dioxide to lay the foundation for safe storage of ethylene oxide, and realize recovery of ethylene oxide and reuse of carbon dioxide. The carbon dioxide pipe network in the application can be used as a temporary storage of carbon dioxide after heat exchange. It can not only meet the needs of other processes that require carbon dioxide, but also supplement the pressurizing protection gas when the amount of heat exchange medium is insufficient. The filling method in the application realizes control of the weight ratio of ethylene oxide to carbon dioxide under the premise of safe filling. This realizes reduction of the flammable and explosive characteristics of ethylene oxide under the premise of meeting the industry standard, enhances the sterilization effect, and realizes long-distance transportation. The combination of the above two methods can reduce the loss of ethylene oxide, avoid the entry of impurity gas into the sterilization product gas, and affect the sterilization effect or not meet the industry standard. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0034] Figure 1 The structure of the application is shown in the figure.

[0035] Figure 2 The control principle block diagram of the application is shown in the figure. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be clearly and completely described below in combination with specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0037] With reference to Figure 1 The present application is a production device and method of mixed sterilization gas of ethylene oxide and carbon dioxide. The device part comprises an ethylene oxide storage tank 1 and a liquid carbon dioxide storage tank 2. The outlet of the ethylene oxide storage tank 1 and the outlet of the liquid carbon dioxide storage tank 2 are respectively connected with a filling unit for configuring mixed sterilization gas with different proportions. The inside of the ethylene oxide storage tank 1 is provided with a heat exchange unit 19 for cooling ethylene oxide. The outlet of the liquid carbon dioxide storage tank 2 is also connected with the pressure stabilizing port 4 of the ethylene oxide storage tank 1 through a heat exchange unit. The present application contains a storage system and a filling system for ethylene oxide. As for the storage system, the present application uses liquid carbon dioxide as heat exchange medium to exchange heat with ethylene oxide through the heat exchange unit in the ethylene oxide storage tank 1. The heat exchanged heat exchange medium enters the ethylene oxide storage tank 1 as pressurizing protection gas, so as to ensure that the temperature and pressure inside the ethylene oxide storage tank 1 are within the expected safety threshold, achieving the purpose of long-term safe storage of ethylene oxide. The above process makes full use of liquid carbon dioxide to save cost and avoid the introduction of impurity gas into the final product gas. Specifically, the pressure in the ethylene oxide storage tank 1 is 0.6-0.8 MPa, and the temperature is-10-10℃. The boiling point of 0.8 MPa carbon dioxide gas is about-43℃. After heat exchange under this condition, the liquid carbon dioxide becomes gaseous carbon dioxide. Based on the pressure and temperature of the ethylene oxide storage tank 1 and the properties of liquid carbon dioxide, the present application can make full use of liquid carbon dioxide without setting a pressurizing device. In addition, the carbon dioxide filled in the filling system of the present application is in liquid phase. The present application is different from the traditional filling form which uses gaseous filling. By using liquid carbon dioxide, the filling weight can be accurately controlled to achieve accurate proportioning of ethylene oxide and carbon dioxide. This not only makes the sterilization product gas meet the industry standard, but also improves the sterilization effect of the sterilization gas. Further, the use of liquid carbon dioxide can overcome the high energy consumption caused by high pressure of gaseous carbon dioxide during the gaseous carbon dioxide filling process. Specifically, the ideal gas equation of state PV=nRT. With the temperature of the gas in the cylinder being too high during the filling process, the pressure increases under the same weight. The liquid carbon dioxide is filled in the dense phase, so a common low-temperature liquid pump can be used, which occupies less space and consumes less energy. At the same time, the phase change heat absorption of the partial gasification of the liquid carbon dioxide in the cylinder can offset the temperature rise, so the temperature rise is less and the pressure rise is less, thereby achieving the purpose of reducing energy consumption.

[0038] Further, the outlet of the liquid carbon dioxide storage tank 2 is provided with a first four-way valve 5, the second end of the first four-way valve 5 is connected with the inlet of the heat exchange unit arranged in the ethylene oxide storage tank 1 through a first valve 6, the outlet of the heat exchange unit is connected with the pressure stabilizing port 4 through a second valve 7 and a third valve 8, and the top of the ethylene oxide storage tank 1 is provided with an ethylene oxide recovery unit. The present application provides a specific technical scheme that liquid carbon dioxide is used as a heat exchange medium and becomes a pressurized protective gas, and further requires that an ethylene oxide recovery unit for recovering the ethylene oxide escaping outside is arranged on the top gas outlet of the ethylene oxide storage tank 1.

[0039] Further, the ethylene oxide recovery unit comprises an ethylene oxide recovery tank 26 connected with the top gas outlet of the ethylene oxide storage tank 1, the inside of the ethylene oxide recovery tank 26 is provided with a recovery heat exchange member 29; the top gas outlet of the ethylene oxide recovery tank 26 is connected with a tail gas treatment device 13, the lower reflux pipeline of the ethylene oxide recovery tank 26 is connected with the reflux liquid port 27 of the ethylene oxide storage tank 1; and the space valve 9 is arranged between the top gas outlet of the ethylene oxide storage tank 1 and the ethylene oxide recovery tank 26. On the basis of the above technical scheme, the ethylene oxide recovery unit is further limited in the present application, and the tail gas treatment device 13 in the present application is a conventional tail gas treatment device, which specifically comprises an absorption tower and a tail gas discharge pipeline. The recovery heat exchange member 29 is used to reduce the temperature inside the ethylene oxide recovery tank 26 in the present application, so as to condense the ethylene oxide gas into liquid phase and make the liquid phase reflux to the ethylene oxide storage tank 1 for recovery.

[0040] Further, the second valve 7 and the third valve 8 are provided with a second four-way valve 10; the third end of the first four-way valve 5 is connected with the inlet of the recovery heat exchange member 29 through a sixth valve 28, and the outlet of the recovery heat exchange member 29 is connected with the third end of the second four-way valve 10 through a seventh valve 30; and the heat exchange unit 19 and the recovery heat exchange member 29 are both heat exchange coils. The recovery heat exchange member 29 uses liquid carbon dioxide as a heat exchange medium in the present application, the inside of the ethylene oxide recovery tank 26 is cooled through the recovery heat exchange member 29, the carbon dioxide after heat exchange is poured into the second four-way valve 10 and can also be used as a pressurized protective gas in the ethylene oxide storage tank 1.

[0041] Further, the fourth end of the second four-way valve 10 is connected with the carbon dioxide gas phase system pipe network 12 through the fourth valve 11. The present application is a complete system, in which the carbon dioxide gas phase system pipe network 12 can recycle the heat-exchanged carbon dioxide to meet the demand of other systems for carbon dioxide, and meanwhile, when there is no heat-exchanged carbon dioxide or the amount of heat-exchanged carbon dioxide is insufficient, the carbon dioxide gas phase system pipe network 12 can supplement the pressurizing protection gas into the ethylene oxide storage tank 1 to maintain the stability of the pressure in the ethylene oxide storage tank 1. Specifically, the carbon dioxide gas phase system pipe network 12 mainly comes from the storage tank venting (storage tank liquid phase gasification) with a pressure of about 1.8 MPa, and after centralized recovery (liquid ammonia heat-exchange liquefaction), the liquefaction can be sent to the liquid carbon dioxide storage tank 2; and as the pressurizing protection gas, the pressure is about 0.6-0.8 MPa, therefore, the carbon dioxide after being used as the heat-exchange medium in the present application and the carbon dioxide in the carbon dioxide gas phase system pipe network 12 can both be used as the pressurizing protection gas.

[0042] Further, the fourth end of the first four-way valve 5 is connected with the mixed sterilization gas filling unit through the carbon dioxide low-temperature liquid pump 14 and the fifth valve 15.

[0043] Further, the mixed sterilization gas filling unit comprises at least one mixed sterilization gas filling part, the mixed sterilization gas filling part comprises the mixed sterilization gas cylinder 3, the inlet of the mixed sterilization gas cylinder 3 is connected with the outlet of the filling busbar 16, the first inlet of the filling busbar 16 is connected with the outlet of the ethylene oxide storage tank 1 through the first filling row valve 17 and the outlet valve 24, and the second inlet of the filling busbar 16 is connected with the outlet of the fifth valve 15 through the second filling row valve 18. The mixed sterilization gas filling unit in the present application comprises at least one mixed sterilization gas filling part, when the mixed sterilization gas filling part is multiple, the parallel connection mode is adopted, that is, each mixed sterilization gas filling part is connected with the ethylene oxide storage tank 1 and the liquid carbon dioxide storage tank 2 respectively, which can realize the simultaneous filling of multiple mixed sterilization gas filling parts to improve the filling efficiency.

[0044] Reference Figure 1 , 2The application also comprises a PLC control system 25, signal inputs of the PLC control system 25 are connected with the storage tank temperature sensor 20, the storage tank pressure sensor 21, the recovery tank temperature sensor 31, the filling pipeline pressure transmitter 22 and the electronic scale 23 respectively; signal outputs of the PLC control system 25 are connected with the first valve 6, the second valve 7, the third valve 8, the vent valve 9, the fourth valve 11, the fifth valve 15, the sixth valve 28, the seventh valve 30, the first filling discharge valve 17 and the second filling discharge valve 18 respectively; the storage tank temperature sensor 20 and the storage tank pressure sensor 21 are connected with the ethylene oxide storage tank 1 respectively; the recovery tank temperature sensor 31 is connected with the ethylene oxide recovery tank 26; the filling pipeline pressure transmitter 22 is arranged on the carbon dioxide filling pipeline between the fifth valve 15 and the second filling discharge valve 18; and the electronic scale 23 is arranged at the bottom of the mixed sterilization gas cylinder 3.

[0045] The application also provides a method for producing the mixed sterilization gas by using ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method and a filling method.

[0046] a. The ethylene oxide storage method comprises the following steps:

[0047] Step 1: The storage tank temperature sensor 20 and the storage tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide storage tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0048] Step 2: When the temperature data detected by the storage tank temperature sensor 20 exceeds the preset threshold value, the PLC control system 25 controls the opening degrees of the first valve 6 and the second valve 7, so that the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the heat exchange unit through the first valve 6 to exchange heat with the ethylene oxide in the ethylene oxide storage tank 1, so that the temperature data detected by the storage tank temperature sensor 20 returns to the preset threshold value;

[0049] Step 3: When the pressure data detected by the storage tank pressure sensor 21 is higher than the pressure preset threshold value, the PLC control system 25 controls the vent valve 9 to open, so that the gas in the ethylene oxide storage tank 1 enters the ethylene oxide recovery tank 26 through the vent valve 9 to release pressure;

[0050] Step 4: The recovery tank temperature sensor 31 detects the temperature in the ethylene oxide recovery tank 26 in real time and transmits the temperature data to the PLC control system 25, which controls the temperature of the recovery heat exchanger 29 by adjusting the opening degrees of the sixth valve 28 and the seventh valve 30, so that the temperature in the ethylene oxide recovery tank 26 is controlled within -10℃ to 0℃; the pressure relief gas in step 3 enters the ethylene oxide recovery tank 26 for cooling, and the cooled liquid phase is ethylene oxide, which enters the ethylene oxide storage tank 1 through the reflux liquid port 27, and the cooled gas phase enters the tail gas treatment device 13 through the gas phase outlet at the top of the ethylene oxide recovery tank 26 for treatment;

[0051] Step 5: When the pressure data detected by the storage tank pressure sensor 21 is lower than the pressure preset threshold, and at the same time, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 in step 2 enters the heat exchange unit 19 for heat exchange, the PLC control system 25 controls the fourth valve 11 to be closed, and the second valve 7 and the third valve 8 to be opened, so that the heat-exchanged carbon dioxide enters the ethylene oxide storage tank 1 as the pressurizing gas of the ethylene oxide storage tank 1, and the pressure data detected by the storage tank pressure sensor 21 is at the preset threshold;

[0052] Step 6: When the pressure data detected by the storage tank pressure sensor 21 is lower than the pressure preset threshold, and at the same time, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 in step 4 enters the recovery heat exchanger 29, the PLC control system 25 controls the fourth valve 11 to be closed, and the seventh valve 30 and the third valve 8 to be opened, so that the heat-exchanged carbon dioxide enters the ethylene oxide storage tank 1 as the pressurizing gas of the ethylene oxide storage tank 1, and the pressure data detected by the storage tank pressure sensor 21 is at the preset threshold;

[0053] Step 7: When the pressure data detected by the storage tank pressure sensor 21 is lower than the pressure preset threshold, and the heat exchange unit is not used for heat exchange, the PLC control system 25 controls the second valve 7 and the seventh valve 30 to be closed, and the fourth valve 11 and the third valve 8 to be opened, so that the carbon dioxide in the carbon dioxide gas phase system pipe network 12 enters the ethylene oxide storage tank 1 as the pressurizing gas of the ethylene oxide storage tank 1, and the pressure data detected by the storage tank pressure sensor 21 is at the preset threshold;

[0054] Step 8: When the pressure data detected by the storage tank pressure sensor 21 is at the pressure preset threshold, the carbon dioxide passing through the second valve 7 in step 2 and / or the carbon dioxide passing through the seventh valve 30 in step 4 enters the carbon dioxide gas phase system pipe network 12 through the fourth valve 11 for use in other gas-consuming sections;

[0055] b. The filling method is used for filling ethylene oxide and carbon dioxide in different proportions, including the following steps:

[0056] Step 1: The ethylene oxide in the ethylene oxide storage tank 1 enters the mixed sterilization gas cylinder 3 through the outlet valve 24, the first filling drain valve 17 and the filling manifold 16;

[0057] Step 2: During the filling of the mixed sterilization gas cylinder 3 by the ethylene oxide storage tank 1 in step 1, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system, and when the ethylene oxide filling weight reaches the predetermined value, the PLC control system 25 controls the first filling drain valve 17 corresponding to the mixed sterilization gas cylinder 3 to be closed;

[0058] Step 3: When the ethylene oxide filling is completed, the fifth valve 15 and the second filling drain valve 18 are opened, and the liquid carbon dioxide pump 14 is started; the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the mixed sterilization gas cylinder 3 through the third end of the first three-way valve 5, the liquid carbon dioxide pump 14, the fifth valve 15, the second filling drain valve 18 and the filling manifold 16;

[0059] Step 4: The filling pipeline pressure transmitter 22 detects the pressure in the carbon dioxide filling pipeline in real time, and when the pressure in the carbon dioxide filling pipeline is < 15 MPa, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 is normally filled into the mixed sterilization gas cylinder 3; when the pressure in the carbon dioxide filling pipeline is ≥ 15 MPa, the PLC control system controls the fifth valve 15 to be closed, and the liquid phase carbon dioxide of the liquid carbon dioxide pump 14 is returned to the self-circulation protection pump body;

[0060] Step 5: During the normal filling of the liquid carbon dioxide, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system 25, and when the liquid carbon dioxide filling weight reaches the predetermined value, the PLC control system controls the second filling drain valve 18 corresponding to the mixed sterilization gas cylinder 3 to be closed.

[0061] The temperature preset threshold of the ethylene oxide storage tank 1 in the ethylene oxide storage method is -10℃-10℃; the pressure preset threshold of the ethylene oxide storage tank 1 in the ethylene oxide storage method is 0.6-0.8 MPa; and the weight ratio of ethylene oxide to carbon dioxide in the filling method is 10-95:90-5. The weight ratio of ethylene oxide to carbon dioxide in the present application is preferably in accordance with the specification of the industry standard YY / T 0822-2011, and specifically, the weight ratio of ethylene oxide to carbon dioxide can be 10:90, 20:80, 30:70, 40:60, 50:50, 70:30, 80:20, 90:10 or 95:5.

[0062] The present application is according to the property of ethylene oxide gas and the specification of industry standard YY / T 0822-2011, on one hand, using liquid phase carbon dioxide as one of the raw materials for filling, not only can accurately control the filling weight, but also can accurately control the weight ratio of ethylene oxide and carbon dioxide; can effectively overcome the problem of high gas temperature in the cylinder during the filling process, which leads to large energy consumption; on the other hand, using liquid phase carbon dioxide as a heat exchange medium to adjust the internal temperature of the ethylene oxide storage tank 1 and the ethylene oxide recovery tank 26, to realize the safe storage and effective recovery of ethylene oxide, and at the same time, the carbon dioxide gas after heat exchange can be used as the pressurizing protection gas of the ethylene oxide storage tank 1, to achieve the purpose of stabilizing the internal pressure of the ethylene oxide storage tank 1.

[0063] In order to explain the present application in more detail, the present application will be further described in conjunction with examples. The specific embodiments are as follows:

[0064] Example 1

[0065] The utility model relates to a kind of production device of ethylene oxide and carbon dioxide mixed sterilization gas, including ethylene oxide storage tank 1 and liquid carbon dioxide storage tank 2, the outlet of the ethylene oxide storage tank 1 and the outlet of liquid carbon dioxide storage tank 2 are connected with the filling unit for configuring different proportion of mixed sterilization gas respectively;The inside of the ethylene oxide storage tank 1 is equipped with heat exchange unit 19 for cooling ethylene oxide, the outlet of liquid carbon dioxide storage tank 2 is also connected with the pressure stabilizing port 4 of ethylene oxide storage tank 1 by heat exchange unit.The first four-way 5 is equipped at the outlet of the liquid carbon dioxide storage tank 2, the second end of the first four-way 5 is connected with the import of heat exchange unit arranged in the ethylene oxide storage tank 1 by first valve 6, the outlet of heat exchange unit is connected with pressure stabilizing port 4 by second valve 7 and third valve 8, and the top of the ethylene oxide storage tank 1 is equipped with ethylene oxide recovery unit.The ethylene oxide recovery unit includes ethylene oxide recovery tank 26 connected with the top gas outlet of ethylene oxide storage tank 1, and the inside of the ethylene oxide recovery tank 26 is equipped with recovery heat exchange piece 29;The top gas outlet of the ethylene oxide recovery tank 26 is connected with tail gas treatment device 13, and the lower reflux pipeline of the ethylene oxide recovery tank 26 is connected with the reflux liquid port 27 of the ethylene oxide storage tank 1;The emptying valve 9 is equipped between the top gas outlet of the ethylene oxide storage tank 1 and the ethylene oxide recovery tank 26.The second valve 7 and third valve 8 are equipped with second four-way 10;The third end of the first four-way 5 is connected with the import of recovery heat exchange piece 29 by sixth valve 28, and the outlet of recovery heat exchange piece 29 is connected with the third end of second four-way 10 by seventh valve 30;The heat exchange unit 19 and recovery heat exchange piece 29 are all heat exchange coil.The fourth end of the second four-way 10 is connected with carbon dioxide gas phase system pipe network 12 by fourth valve 11.The fourth end of the first four-way 5 is connected with mixed sterilization gas filling unit by carbon dioxide low-temperature liquid pump 14 and fifth valve 15.The mixed sterilization gas filling unit includes at least one mixed sterilization gas filling part, and the mixed sterilization gas filling part includes mixed sterilization gas cylinder 3, the import of mixed sterilization gas cylinder 3 is connected with the outlet of filling busbar 16, the first import of filling busbar 16 is connected with the outlet of ethylene oxide storage tank 1 by first filling row valve 17 and outlet valve 24, and the second import of filling busbar 16 is connected with the outlet of fifth valve 15 by second filling row valve 18.The application also comprises a PLC control system 25, signal inputs of the PLC control system 25 are connected with the storage tank temperature sensor 20, the storage tank pressure sensor 21, the recovery tank temperature sensor 31, the filling pipeline pressure transmitter 22 and the electronic scale 23 respectively; signal outputs of the PLC control system 25 are connected with the first valve 6, the second valve 7, the third valve 8, the vent valve 9, the fourth valve 11, the fifth valve 15, the sixth valve 28, the seventh valve 30, the first filling discharge valve 17 and the second filling discharge valve 18 respectively; the storage tank temperature sensor 20 and the storage tank pressure sensor 21 are connected with the ethylene oxide storage tank 1 respectively; the recovery tank temperature sensor 31 is connected with the ethylene oxide recovery tank 26; the filling pipeline pressure transmitter 22 is arranged on the carbon dioxide filling pipeline between the fifth valve 15 and the second filling discharge valve 18; and the electronic scale 23 is arranged at the bottom of the mixed sterilization gas cylinder 3.

[0066] The application also provides a method for producing the mixed sterilization gas by using ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0067] Step 1: the storage tank temperature sensor 20 and the storage tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide storage tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0068] Step 2: when the temperature data detected in the storage tank temperature sensor 20 exceeds the preset threshold value, the PLC control system 25 controls the opening degrees of the first valve 6 and the second valve 7, so that the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the heat exchange unit through the first valve 6 to exchange heat with the ethylene oxide in the ethylene oxide storage tank 1, so that the temperature data detected in the storage tank temperature sensor 20 returns to the preset threshold value;

[0069] Step 3: when the pressure data detected in the storage tank pressure sensor 21 is at the preset pressure threshold value, the carbon dioxide in step 2 passes through the fourth valve 11 to enter the carbon dioxide gas phase system pipeline network 12 for use in other gas-using sections;

[0070] In the ethylene oxide storage method, the temperature preset threshold value of the ethylene oxide storage tank 1 is -10℃ to 10℃; and in the ethylene oxide storage method, the pressure preset threshold value of the ethylene oxide storage tank 1 is 0.6 to 0.8 MPa.

[0071] Example 2

[0072] The structure in this example is the same as that in example 1.

[0073] The application also provides a method for producing sterilization gas by mixing ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0074] Step 1: The tank temperature sensor 20 and the tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0075] Step 2: When the pressure data detected by the tank pressure sensor 21 is higher than the pressure preset threshold, the PLC control system 25 controls the opening of the vent valve 9, so that the gas in the ethylene oxide tank 1 is discharged into the ethylene oxide recovery tank 26 through the vent valve 9 to release pressure;

[0076] Step 3: The recovery tank temperature sensor 31 detects the temperature in the ethylene oxide recovery tank 26 in real time, and transmits the temperature data to the PLC control system 25, and the PLC control system 25 controls the temperature of the recovery heat exchanger 29 by adjusting the opening degrees of the sixth valve 28 and the seventh valve 30, so that the temperature in the ethylene oxide recovery tank 26 is controlled within-10℃-0℃; the pressure relief gas in step 2 enters the ethylene oxide recovery tank 26 to be cooled, and the cooled liquid phase is ethylene oxide, which enters the ethylene oxide tank 1 through the reflux liquid port 27, and the cooled gas phase enters the tail gas treatment device 13 through the gas phase outlet at the top of the ethylene oxide recovery tank 26 for treatment;

[0077] Step 4: When the pressure data detected by the tank pressure sensor 21 is at the pressure preset threshold, the carbon dioxide in step 3 passes through the fourth valve 11 into the carbon dioxide gas phase system pipe network 12 for use in other gas-consuming sections through the seventh valve 30;

[0078] The temperature preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is-10℃-10℃, and the pressure preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is 0.6-0.8MPa.

[0079] Example 3

[0080] The structure in this example is the same as that in example 1.

[0081] The application also provides a method for producing sterilization gas by mixing ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0082] Step 1: The tank temperature sensor 20 and the tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0083] Step 2: When the temperature data detected in the tank temperature sensor 20 exceeds the preset threshold, the PLC control system 25 controls the opening degree of the first valve 6 and the second valve 7, so that the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the heat exchange unit through the first valve 6 to exchange heat with the ethylene oxide in the ethylene oxide storage tank 1, so that the temperature data detected in the tank temperature sensor 20 returns to the preset threshold;

[0084] Step 3: When the pressure data detected in the tank pressure sensor 21 is higher than the pressure preset threshold, the PLC control system 25 controls the opening of the vent valve 9, so that the gas in the ethylene oxide storage tank 1 enters the ethylene oxide recovery tank 26 through the vent valve 9 to release pressure;

[0085] Step 4: The recovery tank temperature sensor 31 detects the temperature in the ethylene oxide recovery tank 26 in real time, and transmits the temperature data to the PLC control system 25, and the PLC control system 25 controls the temperature of the recovery heat exchange member 29 by adjusting the opening degree of the sixth valve 28 and the seventh valve 30, so that the temperature in the ethylene oxide recovery tank 26 is controlled within-10℃-0℃; The cooled liquid phase is ethylene oxide, which enters the ethylene oxide storage tank 1 through the reflux liquid port 27, and the cooled gas phase enters the tail gas treatment device 13 through the gas phase outlet at the top of the ethylene oxide recovery tank 26 for treatment;

[0086] Step 5: When the pressure data detected in the tank pressure sensor 21 is at the pressure preset threshold, the carbon dioxide passing through the second valve 7 in step 2 and the carbon dioxide passing through the seventh valve 30 in step 4 enter the carbon dioxide gas phase system pipe network 12 through the fourth valve 11, for use in other gas-consuming sections;

[0087] The temperature preset threshold of the ethylene oxide storage tank 1 in the ethylene oxide storage method is-10℃-10℃; and the pressure preset threshold of the ethylene oxide storage tank 1 in the ethylene oxide storage method is 0.6-0.8MPa.

[0088] Example 4

[0089] The structure in this example is the same as that in Example 1.

[0090] The application also provides a method for producing a sterilization gas mixed with ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0091] Step 1: The tank temperature sensor 20 and the tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide storage tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0092] Step 2: When the temperature data detected in the tank temperature sensor 20 exceeds the preset threshold, the PLC control system 25 controls the opening degree of the first valve 6 and the second valve 7, so that the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the heat exchange unit through the first valve 6 to exchange heat with the ethylene oxide in the ethylene oxide tank 1, so that the temperature data detected in the tank temperature sensor 20 returns to the preset threshold;

[0093] Step 3: When the pressure data detected in the tank pressure sensor 21 is lower than the pressure preset threshold, the PLC control system 25 controls the fourth valve 11 to be closed, the second valve 7 and the third valve 8 to be opened, so that the carbon dioxide after heat exchange in step 2 enters the ethylene oxide tank 1 as a pressurizing gas of the ethylene oxide tank 1, and the pressure data detected in the tank pressure sensor 21 is in the preset threshold;

[0094] The temperature preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is -10℃-10℃; and the pressure preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is 0.6-0.8MPa.

[0095] Example 5

[0096] The structure in this example is the same as that in Example 1.

[0097] The application also provides a method for producing a sterilization gas mixed with ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0098] Step 1: The tank temperature sensor 20 and the tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0099] Step 2: When the pressure data detected in the tank pressure sensor 21 is lower than the pressure preset threshold, the PLC control system 25 controls the second valve 7 and the seventh valve 30 to be closed, and the fourth valve 11 and the third valve 8 to be opened, so that the carbon dioxide in the carbon dioxide gas phase system pipe network 12 enters the ethylene oxide tank 1 as a pressurizing gas of the ethylene oxide tank 1, and the pressure data detected in the tank pressure sensor 21 is in the preset threshold;

[0100] The temperature preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is -10℃-10℃; and the pressure preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is 0.6-0.8MPa.

[0101] Example 6

[0102] The structure in this example is the same as that in Example 1.

[0103] The application also provides a method for producing sterilization gas mixed with ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0104] Step 1: The temperature and pressure conditions in the ethylene oxide storage tank 1 are monitored in real time by the storage tank temperature sensor 20 and the storage tank pressure sensor 21, and the temperature and pressure data are transmitted to the PLC control system 25;

[0105] Step 2: When the pressure data detected by the storage tank pressure sensor 21 is higher than the pressure preset threshold value, the PLC control system 25 controls the opening of the vent valve 9, so that the gas in the ethylene oxide storage tank 1 is discharged into the ethylene oxide recovery tank 26 through the vent valve 9 to release pressure;

[0106] Step 3: The temperature in the ethylene oxide recovery tank 26 is detected in real time by the recovery tank temperature sensor 31, and the temperature data are transmitted to the PLC control system 25, and the PLC control system 25 controls the temperature of the recovery heat exchange member 29 by adjusting the opening degrees of the sixth valve 28 and the seventh valve 30, so that the temperature in the ethylene oxide recovery tank 26 is controlled within-10℃-0℃; the pressure relief gas in step 2 enters the ethylene oxide recovery tank 26 to be cooled, and the cooled liquid phase is ethylene oxide, which enters the ethylene oxide storage tank 1 through the reflux liquid port 27, and the cooled gas phase enters the tail gas treatment device 13 through the gas phase outlet at the top of the ethylene oxide recovery tank 26 for treatment;

[0107] Step 4: When the pressure data detected by the storage tank pressure sensor 21 is lower than the pressure preset threshold value, the PLC control system 25 controls the closing of the fourth valve 11 and the opening of the seventh valve 30 and the third valve 8, so that the heat-exchanged carbon dioxide enters the ethylene oxide storage tank 1 as the pressurizing gas of the ethylene oxide storage tank 1, and the pressure data detected by the storage tank pressure sensor 21 is at the preset threshold value;

[0108] The temperature preset threshold value of the ethylene oxide storage tank 1 in the ethylene oxide storage method is-10℃-10℃, and the pressure preset threshold value of the ethylene oxide storage tank 1 in the ethylene oxide storage method is 0.6-0.8MPa.

[0109] Example 7

[0110] The structure in this example is the same as that in example 1.

[0111] The application also provides a method for producing sterilization gas mixed with ethylene oxide and carbon dioxide, which comprises an ethylene oxide storage method, and the ethylene oxide storage method comprises the following steps:

[0112] Step 1: The tank temperature sensor 20 and the tank pressure sensor 21 monitor the temperature and pressure conditions in the ethylene oxide tank 1 in real time, and transmit the temperature and pressure data to the PLC control system 25;

[0113] Step 2: When the temperature data detected by the tank temperature sensor 20 exceeds the preset threshold, the PLC control system 25 controls the opening degree of the first valve 6 and the second valve 7, so that the liquid carbon dioxide in the liquid carbon dioxide tank 2 enters the heat exchange unit through the first valve 6 to exchange heat with the ethylene oxide in the ethylene oxide tank 1, so that the temperature data detected by the tank temperature sensor 20 returns to the preset threshold;

[0114] Step 3: When the pressure data detected by the tank pressure sensor 21 is higher than the pressure preset threshold, the PLC control system 25 controls the opening of the vent valve 9, so that the gas in the ethylene oxide tank 1 enters the ethylene oxide recovery tank 26 through the vent valve 9 to release pressure;

[0115] Step 4: The recovery tank temperature sensor 31 detects the temperature in the ethylene oxide recovery tank 26 in real time, and transmits the temperature data to the PLC control system 25. The PLC control system 25 controls the temperature of the recovery heat exchange member 29 by adjusting the opening degree of the sixth valve 28 and the seventh valve 30, so that the temperature in the ethylene oxide recovery tank 26 is controlled within-10℃-0℃. The pressure relief gas in step 3 enters the ethylene oxide recovery tank 26 to cool, and the cooled liquid phase is ethylene oxide, which enters the ethylene oxide tank 1 through the reflux liquid port 27. The cooled gas phase enters the tail gas treatment device 13 through the gas phase outlet at the top of the ethylene oxide recovery tank 26 for treatment;

[0116] Step 5: When the pressure data detected by the tank pressure sensor 21 is lower than the pressure preset threshold, the PLC control system 25 controls the fourth valve 11 to be closed, and the second valve 7, the seventh valve 30 and the third valve 8 to be opened, so that the heat exchanged carbon dioxide enters the ethylene oxide tank 1 as a pressurizing gas and makes the pressure data detected by the tank pressure sensor 21 reach the preset threshold;

[0117] The temperature preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is-10℃-10℃, and the pressure preset threshold of the ethylene oxide tank 1 in the ethylene oxide storage method is 0.6-0.8MPa.

[0118] Example 8

[0119] The structure in this example is the same as that in Example 1.

[0120] The application also provides a method for producing the sterilization gas mixture of ethylene oxide and carbon dioxide, which further comprises a filling method of ethylene oxide, and the filling method is used for filling ethylene oxide and carbon dioxide in different proportions, and comprises the following steps:

[0121] Step 1: ethylene oxide in the ethylene oxide storage tank 1 enters the mixed sterilization gas cylinder 3 through the outlet valve 24, the first filling discharge valve 17 and the filling manifold 16;

[0122] Step 2: during the filling of the mixed sterilization gas cylinder 3 by the ethylene oxide storage tank 1 in step 1, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system, and when the ethylene oxide filling weight reaches a predetermined value, the PLC control system 25 controls the first filling discharge valve 17 corresponding to the mixed sterilization gas cylinder 3 to be closed;

[0123] Step 3: when the ethylene oxide filling is completed, the fifth valve 15 and the second filling discharge valve 18 are opened, and the carbon dioxide low-temperature liquid pump 14 is started; the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the mixed sterilization gas cylinder 3 through the third end of the first three-way valve 5, the carbon dioxide low-temperature liquid pump 14, the fifth valve 15, the second filling discharge valve 18 and the filling manifold 16;

[0124] Step 4: the carbon dioxide filling pipeline pressure transmitter 22 detects the pressure in the carbon dioxide filling pipeline in real time, when the pressure in the carbon dioxide filling pipeline is < 15 MPa, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 is normally filled into the mixed sterilization gas cylinder 3; when the pressure in the carbon dioxide filling pipeline is ≥ 15 MPa, the PLC control system controls the fifth valve 15 to be closed, and the liquid-phase carbon dioxide of the carbon dioxide low-temperature liquid pump 14 is backflowed to the self-circulation protection liquid pump body;

[0125] Step 5: during the normal filling of the liquid carbon dioxide, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system 25, and when the liquid carbon dioxide filling weight reaches a predetermined value, the PLC control system controls the second filling discharge valve 18 corresponding to the mixed sterilization gas cylinder 3 to be closed.

[0126] The weight ratio of ethylene oxide to carbon dioxide in the filling method is 10:90.

[0127] Example 9

[0128] The structure in this example is the same as that in example 1.

[0129] The application also provides a method for producing the sterilization gas mixture of ethylene oxide and carbon dioxide, which further comprises a filling method of ethylene oxide, and the filling method is used for filling ethylene oxide and carbon dioxide in different proportions, and comprises the following steps:

[0130] Step 1: ethylene oxide in the ethylene oxide storage tank 1 enters the mixed sterilization gas cylinder 3 through the outlet valve 24, the first filling discharge valve 17 and the filling manifold 16;

[0131] Step 2: during the filling of the mixed sterilization gas cylinder 3 by the ethylene oxide storage tank 1 in step 1, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system, and when the ethylene oxide filling weight reaches a predetermined value, the PLC control system 25 controls the first filling discharge valve 17 corresponding to the mixed sterilization gas cylinder 3 to be closed;

[0132] Step 3: when the ethylene oxide filling is completed, the fifth valve 15 and the second filling discharge valve 18 are opened, and the carbon dioxide low-temperature liquid pump 14 is started; the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the mixed sterilization gas cylinder 3 through the third end of the first three-way valve 5, the carbon dioxide low-temperature liquid pump 14, the fifth valve 15, the second filling discharge valve 18 and the filling manifold 16;

[0133] Step 4: the carbon dioxide filling pipeline pressure transmitter 22 detects the pressure in the carbon dioxide filling pipeline in real time, when the pressure in the carbon dioxide filling pipeline is < 15 MPa, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 is normally filled into the mixed sterilization gas cylinder 3; when the pressure in the carbon dioxide filling pipeline is ≥ 15 MPa, the PLC control system controls the fifth valve 15 to be closed, and the liquid-phase carbon dioxide of the carbon dioxide low-temperature liquid pump 14 is backflowed to the self-circulation protection liquid pump body;

[0134] Step 5: during the normal filling of the liquid carbon dioxide, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system 25, and when the liquid carbon dioxide filling weight reaches a predetermined value, the PLC control system controls the second filling discharge valve 18 corresponding to the mixed sterilization gas cylinder 3 to be closed.

[0135] The weight ratio of ethylene oxide to carbon dioxide in the filling method is 55:45.

[0136] Example 10

[0137] The structure in this example is the same as that in example 1.

[0138] The application also provides a method for producing the sterilization gas mixed with ethylene oxide and carbon dioxide, which further comprises a filling method of ethylene oxide, and the filling method is used for filling ethylene oxide and carbon dioxide in different proportions, and comprises the following steps:

[0139] Step 1: ethylene oxide in the ethylene oxide storage tank 1 enters the mixed sterilization gas cylinder 3 through the outlet valve 24, the first filling discharge valve 17 and the filling manifold 16;

[0140] Step 2: during the filling of the mixed sterilization gas cylinder 3 by the ethylene oxide storage tank 1 in step 1, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system, and when the ethylene oxide filling weight reaches a predetermined value, the PLC control system 25 controls the first filling discharge valve 17 corresponding to the mixed sterilization gas cylinder 3 to be closed;

[0141] Step 3: when the ethylene oxide filling is completed, the fifth valve 15 and the second filling discharge valve 18 are opened, and the carbon dioxide low-temperature liquid pump 14 is started; the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the mixed sterilization gas cylinder 3 through the third end of the first three-way valve 5, the carbon dioxide low-temperature liquid pump 14, the fifth valve 15, the second filling discharge valve 18 and the filling manifold 16;

[0142] Step 4: the carbon dioxide filling pipeline pressure transmitter 22 detects the pressure in the carbon dioxide filling pipeline in real time, when the pressure in the carbon dioxide filling pipeline is < 15 MPa, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 is normally filled into the mixed sterilization gas cylinder 3; when the pressure in the carbon dioxide filling pipeline is ≥ 15 MPa, the PLC control system controls the fifth valve 15 to be closed, and the liquid carbon dioxide of the carbon dioxide low-temperature liquid pump 14 is returned to the self-circulation protection liquid pump body;

[0143] Step 5: during the normal filling of the liquid carbon dioxide, the electronic scale 23 weighs the mixed sterilization gas cylinder 3 and transmits the weighing data to the PLC control system 25, and when the liquid carbon dioxide filling weight reaches a predetermined value, the PLC control system controls the second filling discharge valve 18 corresponding to the mixed sterilization gas cylinder 3 to be closed.

[0144] The weight ratio of ethylene oxide to carbon dioxide in the filling method is 95:5.

[0145] Although the embodiments of the application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. An apparatus for producing a sterilizing gas mixture of ethylene oxide and carbon dioxide, comprising an ethylene oxide storage tank (1) and a liquid carbon dioxide storage tank (2), characterized in that: The outlet of the ethylene oxide tank (1) and the outlet of the liquid carbon dioxide tank (2) are connected with a mixed sterilization gas filling unit for configuring different proportions, respectively; The inside of the ethylene oxide tank (1) is provided with a heat exchange unit (19) for cooling ethylene oxide, and the outlet of the liquid carbon dioxide tank (2) is also connected with the pressure stabilizing port (4) of the ethylene oxide tank (1) through the heat exchange unit; The outlet of the liquid carbon dioxide tank (2) is provided with a first four-way valve (5), the second end of the first four-way valve (5) is connected with the inlet of the heat exchange unit provided in the ethylene oxide tank (1) through a first valve (6), the outlet of the heat exchange unit is connected with the pressure stabilizing port (4) through a second valve (7) and a third valve (8), and the top of the ethylene oxide tank (1) is provided with an ethylene oxide recovery unit; The ethylene oxide recovery unit comprises an ethylene oxide recovery tank (26) connected with the gas outlet at the top of the ethylene oxide tank (1), and the inside of the ethylene oxide recovery tank (26) is provided with a recovery heat exchange element (29); The fourth end of the first four-way valve (5) is connected with the mixed sterilization gas filling unit through a carbon dioxide low-temperature liquid pump (14) and a fifth valve (15).

2. The device for producing a sterilizing gas containing a mixture of ethylene oxide and carbon dioxide according to claim 1, characterized in that: The gas outlet at the top of the ethylene oxide recovery tank (26) is connected with a tail gas treatment device (13), and the lower reflux pipeline of the ethylene oxide recovery tank (26) is connected with a reflux liquid port (27) of the ethylene oxide tank (1); The gas outlet at the top of the ethylene oxide tank (1) and the ethylene oxide recovery tank (26) are provided with a vent valve (9).

3. The device for producing mixed sterilizing gas of ethylene oxide and carbon dioxide according to claim 2, characterized in that: A second four-way valve (10) is arranged between the second valve (7) and the third valve (8); The third end of the first four-way valve (5) is connected with the inlet of the recovery heat exchange element (29) through a sixth valve (28), and the outlet of the recovery heat exchange element (29) is connected with the third end of the second four-way valve (10) through a seventh valve (30); The heat exchange unit (19) and the recovery heat exchange element (29) are both heat exchange coils.

4. The device for producing mixed sterilizing gas of ethylene oxide and carbon dioxide according to claim 3, characterized in that: The fourth end of the second four-way valve (10) is connected with a carbon dioxide gas phase system pipeline network (12) through a fourth valve (11).

5. The device for producing mixed sterilizing gas of ethylene oxide and carbon dioxide according to claim 4, characterized in that: The mixed sterilization gas filling unit comprises at least one mixed sterilization gas filling part, the mixed sterilization gas filling part comprises a mixed sterilization gas cylinder (3), the inlet of the mixed sterilization gas cylinder (3) is connected with the outlet of a filling busbar (16), the first inlet of the filling busbar (16) is connected with the outlet of the ethylene oxide tank (1) through a first filling valve (17) and an outlet valve (24), and the second inlet of the filling busbar (16) is connected with the outlet of the fifth valve (15) through a second filling valve (18).

6. The device for producing mixed sterilizing gas of ethylene oxide and carbon dioxide according to claim 5, characterized in that: Further comprising a PLC control system (25), signal inputs of the PLC control system (25) are connected with the tank temperature sensor (20), the tank pressure sensor (21), the recovery tank temperature sensor (31), the filling pipeline pressure transmitter (22) and the electronic scale (23) respectively; signal outputs of the PLC control system (25) are connected with the first valve (6), the second valve (7), the third valve (8), the vent valve (9), the fourth valve (11), the fifth valve (15), the sixth valve (28), the seventh valve (30), the first filling discharge valve (17) and the second filling discharge valve (18) respectively; The tank temperature sensor (20) and the tank pressure sensor (21) are connected with the ethylene oxide tank (1) respectively; The recovery tank temperature sensor (31) is connected with the ethylene oxide recovery tank (26); The filling pipeline pressure transmitter (22) is arranged on the carbon dioxide filling pipeline between the fifth valve (15) and the second filling discharge valve (18); The electronic scale (23) is arranged at the bottom of the mixed sterilization gas cylinder (3).

7. A method for producing a sterilizing gas mixture of ethylene oxide and carbon dioxide using the device of claim 6, characterized in that: The method comprises ethylene oxide storage and ethylene oxide and carbon dioxide filling with different proportions; a. The ethylene oxide storage comprises the following steps: a1: The tank temperature sensor (20) and the tank pressure sensor (21) monitor the temperature and pressure conditions in the ethylene oxide tank (1) in real time, and transmit the temperature and pressure data to the PLC control system (25); a2: When the temperature data detected by the tank temperature sensor (20) exceeds the temperature preset threshold, the PLC control system (25) controls the opening degree of the first valve (6) and the second valve (7), so that the liquid carbon dioxide in the liquid carbon dioxide tank (2) enters the heat exchange unit through the first valve (6) to exchange heat with the ethylene oxide in the ethylene oxide tank (1), so that the temperature data detected by the tank temperature sensor (20) returns to the temperature preset threshold; a3: When the pressure data detected by the tank pressure sensor (21) is higher than the pressure preset threshold, the PLC control system (25) controls the vent valve (9) to open, so that the gas in the ethylene oxide tank (1) enters the ethylene oxide recovery tank (26) through the vent valve (9) to release pressure; a4: The recovery tank temperature sensor (31) detects the temperature in the ethylene oxide recovery tank (26) in real time, and transmits the temperature data to the PLC control system (25); the PLC control system (25) controls the temperature of the recovery heat exchange member (29) by adjusting the opening degree of the sixth valve (28) and the seventh valve (30), so that the temperature in the ethylene oxide recovery tank (26) is controlled within-10℃-0℃; the gas released in step a3 enters the ethylene oxide recovery tank (26) to be cooled, and the cooled liquid phase is ethylene oxide, which enters the ethylene oxide tank (1) through the reflux liquid port (27), and the gaseous phase cooled in the ethylene oxide recovery tank (26) enters the tail gas treatment device (13) for treatment; Step a5: when the pressure data detected in the tank pressure sensor (21) is lower than the pressure preset threshold value, and at the same time, the liquid carbon dioxide in the liquid carbon dioxide storage tank (2) in step a2 enters the heat exchange unit (19) for heat exchange, the PLC control system (25) controls the fourth valve (11) to be closed, the second valve (7) and the third valve (8) to be opened, so that the heat-exchanged carbon dioxide enters the ethylene oxide tank (1) as the pressurizing gas of the ethylene oxide tank (1) and makes the pressure data detected in the tank pressure sensor (21) be at the pressure preset threshold value; Step a6: when the pressure data detected in the tank pressure sensor (21) is lower than the pressure preset threshold value, and at the same time, the liquid carbon dioxide in the liquid carbon dioxide storage tank (2) in step a4 enters the recovery heat exchange element (29), the PLC control system (25) controls the fourth valve (11) to be closed, the seventh valve (30) and the third valve (8) to be opened, so that the heat-exchanged carbon dioxide enters the ethylene oxide tank (1) as the pressurizing gas of the ethylene oxide tank (1) and makes the pressure data detected in the tank pressure sensor (21) be at the pressure preset threshold value; Step a7: when the pressure data detected in the tank pressure sensor (21) is lower than the pressure preset threshold value, and without using the heat exchange unit for heat exchange, the PLC control system (25) controls the second valve (7) and the seventh valve (30) to be closed, the fourth valve (11) and the third valve (8) to be opened, so that the carbon dioxide in the carbon dioxide gas phase system pipe network (12) enters the ethylene oxide tank (1) as the pressurizing gas of the ethylene oxide tank (1) and makes the pressure data detected in the tank pressure sensor (21) be at the pressure preset threshold value; Step a8: when the pressure data detected in the tank pressure sensor (21) is at the pressure preset threshold value, the carbon dioxide passing through the second valve (7) in step a2 and / or the carbon dioxide passing through the seventh valve (30) in step a4 enters the carbon dioxide gas phase system pipe network (12) through the fourth valve (11) for use in other gas-using sections; b, the different proportions of ethylene oxide and carbon dioxide for filling, including the following steps: Step b1: the ethylene oxide in the ethylene oxide tank (1) enters the mixed sterilization gas cylinder (3) through the outlet valve (24), the first filling discharge valve (17) and the filling busbar (16); Step b2: during the filling of the mixed sterilization gas cylinder (3) by the ethylene oxide tank (1) in step b1, the electronic scale (23) weighs the mixed sterilization gas cylinder (3) and transmits the weighing data to the PLC control system, and when the ethylene oxide filling weight reaches the predetermined value, the PLC control system (25) controls the first filling discharge valve (17) corresponding to the mixed sterilization gas cylinder (3) to be closed; Step b3: when the ethylene oxide is filled, open the fifth valve (15) and the second filling discharge valve (18), and start the carbon dioxide low-temperature liquid pump (14); the liquid carbon dioxide in the liquid carbon dioxide storage tank (2) enters the mixed sterilization gas cylinder (3) through the fourth end of the first four-way valve (5), the carbon dioxide low-temperature liquid pump (14), the fifth valve (15), the second filling discharge valve (18) and the filling manifold (16); Step b4: the filling pipeline pressure transmitter (22) detects the pressure in the carbon dioxide filling pipeline in real time; when the pressure in the carbon dioxide filling pipeline is < 15 MPa, the liquid carbon dioxide in the liquid carbon dioxide storage tank (2) is normally filled into the mixed sterilization gas cylinder (3); when the pressure in the carbon dioxide filling pipeline is ≥ 15 MPa, the PLC control system controls the fifth valve (15) to be closed, and the liquid phase carbon dioxide of the carbon dioxide low-temperature liquid pump (14) is returned to the self-circulation protection liquid pump body; Step b5: in the process of normal filling of the liquid carbon dioxide, the electronic scale (23) weighs the mixed sterilization gas cylinder (3) and transmits the weighing data to the PLC control system (25); when the liquid carbon dioxide filling weight reaches a predetermined value, the PLC control system controls the second filling discharge valve (18) corresponding to the mixed sterilization gas cylinder (3) to be closed.

8. The method of the production device of the ethylene oxide and carbon dioxide mixed sterilization gas according to claim 7, characterized in that: The temperature preset threshold of the ethylene oxide storage tank (1) in the ethylene oxide storage is -10℃-10℃; The pressure preset threshold of the ethylene oxide storage tank (1) in the ethylene oxide storage is 0.6-0.8 MPa.

Images