CN114379878B - Control method for constant temperature and humidity of ethylene oxide sterilization pretreatment - Google Patents
Control method for constant temperature and humidity of ethylene oxide sterilization pretreatment Download PDFInfo
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- CN114379878B CN114379878B CN202111672151.8A CN202111672151A CN114379878B CN 114379878 B CN114379878 B CN 114379878B CN 202111672151 A CN202111672151 A CN 202111672151A CN 114379878 B CN114379878 B CN 114379878B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B55/00—Preserving, protecting or purifying packages or package contents in association with packaging
- B65B55/02—Sterilising, e.g. of complete packages
- B65B55/12—Sterilising contents prior to, or during, packaging
- B65B55/18—Sterilising contents prior to, or during, packaging by liquids or gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
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Abstract
The invention belongs to the technical field of intelligent control, and particularly relates to a control method for ethylene oxide sterilization pretreatment constant temperature and humidity. Adopting an ethylene oxide sterilization pretreatment constant temperature and humidity control system, wherein the control system comprises a preheating chamber, a combined air conditioning system, a geothermal coil pipe and an automatic control system; the combined air conditioning system is arranged at the middle position of the top of the preheating chamber and comprises a combined air conditioning unit, and the geothermal coil is arranged at the bottom of the preheating chamber; the automatic control system enables the temperature and humidity of the preheating chamber to be always kept within a required range. Therefore, the control system can monitor the temperature and humidity of the surface of the instrument to be sterilized in real time within a preset time to meet the requirements; and when the medical instrument is subjected to batch warehouse-out and door-opening operation, the automatic control system can monitor and correct the difference value between the temperature and the humidity inside and outside the preheating chamber, so that the aim of meeting the condition that the medical instrument reaches sterilization through the temperature and the humidity of the preheating surface and improving the efficiency of the subsequent ethylene oxide sterilization process is fulfilled.
Description
Technical Field
The invention belongs to the technical field of intelligent control, and particularly relates to a control method for ethylene oxide sterilization pretreatment constant temperature and humidity.
Background
Ethylene oxide is a broad-spectrum sterilizing agent, and can kill various microorganisms including spores, tubercle bacillus, bacteria, viruses, fungi and the like at normal temperature, and an ethylene oxide sterilizing device is sterilizing equipment using ethylene oxide as a sterilizing agent.
The ethylene oxide sterilizing device is used as key equipment of a disposable sterile medical instrument production enterprise, special requirements are met for installation operation and use management, the temperature and the humidity before sterilization are key important parameters for influencing the sterilization effect of the ethylene oxide, and researches show that when the relative humidity is less than 30%, the residual spore curve is similar to a concave shape, and when the relative humidity reaches 50% -70%, the residual spore curve basically shows or approaches a linear shape. In addition, the penetration rate of the water vapor is weaker than that of the ethylene oxide, the time and the temperature are the same, the water vapor is not as long as the ethylene oxide can penetrate the product with the same thickness, but the ethylene oxide needs the existence of water and can interact with microorganisms after the annular structure is opened, so that a constant temperature and humidity preheating chamber is provided as an intermediate link in a sterilization process in a pretreatment stage, and the temperature and humidity control of a sterilization product is performed in advance to eliminate a cold spot so as to prepare for formally entering the ethylene oxide sterilization link.
At present, most of the preheating of products adopts a pretreatment cabinet, and the products are transported to an ethylene oxide sterilization cabinet for sterilization after being preheated in the pretreatment cabinet. The pretreatment cabinet is difficult to grasp whether the product can truly reach the preset temperature and humidity, and when the product enters the sterilization cabinet from the pretreatment cabinet after the product is preheated, the temperature and humidity of the product change due to the opening of the pretreatment cabinet, so that the sterilization final result is affected.
Disclosure of Invention
First, the technical problem to be solved
In order to solve the problems in the prior art, the invention provides a control method for the constant temperature and humidity of the ethylene oxide sterilization pretreatment, which adopts a combined air conditioning system and a geothermal coil to heat and humiture and is matched with an automatic control system to control the humiture, so that the technical problems that the humiture on the surface of a medical instrument does not reach the standard before the medical instrument formally enters an ethylene oxide sterilization bin and the temperature and humidity change affects the sterilization final result when a preheating room needs to be opened are solved.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
the invention provides a control method for the sterilization pretreatment of ethylene oxide under constant temperature and humidity, which comprises the following steps: the system comprises a preheating chamber, a combined air conditioning system for heating air in the preheating chamber and supplementing water vapor for hot air, a geothermal coil for enhancing heating of the preheating chamber and an automatic control system for monitoring the temperature and humidity of the preheating chamber, wherein the preheating chamber is provided with a heating chamber;
when the difference between the average temperature B of the preheating chamber and the average temperature A of the door of the preheating chamber is greater than the threshold T1, the average temperature B of the preheating chamber is lower than the average value B of the required temperature of the preheating chamber Are all When the combined air conditioning system and the geothermal coil are started, the preheating chamber is heated;
when the difference between the average temperature B of the preheating chamber and the average temperature C in the package to be sterilized is greater than a threshold T1, the heating time of the combined air conditioning system and the geothermal coil to the preheating chamber is prolonged;
when the difference between the average relative humidity Y of the preheating chamber and the average relative humidity X of the door of the preheating chamber is greater than the threshold value T2, the average relative humidity Y of the preheating chamber is lower than the average value Y of the required relative humidity of the preheating chamber Are all When the combined air conditioning system is started, the preheating chamber is humidified;
when the average relative humidity Y of the preheating chamber is equal to the average relative humidity X of the door of the preheating chamber, stopping the combined air conditioning system from humidifying the preheating chamber;
when the difference between the average relative humidity Y of the preheating chamber and the average relative humidity Z in the package to be sterilized is greater than a threshold value T2, the time for the combined air conditioning system to humidify the preheating chamber is prolonged.
Further, the combined air conditioning system and the geothermal coil are arranged outside the preheating chamber, the combined air conditioning system is arranged in the middle of the top of the preheating chamber, the combined air conditioning system comprises a combined air conditioning unit, the combined air conditioning unit is provided with an air conditioning steam inlet and an air conditioning humidifier inlet, which are used for enabling main steam to enter the combined air conditioning unit through an air conditioning steam pipeline, a heating coil condensed water outlet and a humidifying coil condensed water outlet, which are used for enabling condensed water to flow out of the combined air conditioning unit, and the heating coil condensed water outlet and the humidifying coil condensed water outlet are converged into a condensed water outlet;
the geothermal coil is arranged at the bottom of the preheating chamber;
the automatic control system is used for automatically detecting and adjusting the temperature and humidity change of the preheating chamber, so that the temperature and humidity of the preheating chamber are always kept within a required range.
Further, the combined air conditioning system further comprises an air supply pipeline, an air return pipeline, a fresh air system and a built-in fan, wherein the air return pipeline is communicated with the built-in fan.
Further, the ethylene oxide sterilization pretreatment constant temperature and humidity control system further comprises a heat exchanger, water circulated into the heat exchanger is heated to 30-60 ℃, a heat exchanger steam inlet, a heat exchanger cold water inlet, a heat exchanger hot water outlet and a heat exchanger cold water outlet are arranged on the heat exchanger, and a steam regulating valve is arranged on the heat exchanger steam inlet.
Further, the ethylene oxide sterilization pretreatment constant temperature and humidity control system further comprises a branch cylinder, wherein the branch cylinder is arranged at the inlet of the system and divides main steam into two parts, the main steam enters the combined air conditioning system and the heat exchanger respectively, the branch cylinder is provided with a main steam inlet, a branch cylinder first steam outlet and a branch cylinder second steam outlet, and the branch cylinder first steam outlet and the branch cylinder second steam outlet are communicated with the air conditioning steam inlet, the air conditioning humidifier port and the heat exchanger steam inlet through a group air steam pipeline and the heat exchanger steam pipeline respectively.
Further, the geothermal coil is provided with a geothermal cold water outlet and a geothermal hot water inlet, the geothermal coil is communicated with a circulating water tank, the circulating water tank is provided with a first cold water inlet of the water tank, a second cold water inlet of the water tank, a hot water outlet of the water tank and a cold water outlet of the water tank, the first cold water inlet of the water tank is communicated with the condensed water outlet through a pipeline, the second cold water inlet of the water tank is communicated with the geothermal cold water outlet through a pipeline, and the hot water inlet of the water tank and the cold water outlet of the water tank are respectively communicated with the hot water outlet of the heat exchanger and the cold water inlet of the heat exchanger through pipelines.
Further, a heating pump is arranged on a pipeline between the circulating water tank and the heat exchanger, the heating pump comprises a first heating pump and a second heating pump, and the working modes of the heating pump are divided into an automatic mode and a manual mode.
Further, a geothermal circulating pump is arranged on a pipeline between the circulating water tank and the geothermal coil, the geothermal circulating pump comprises a first geothermal circulating pump and a second geothermal circulating pump, and the geothermal circulating pump is divided into an automatic mode and a manual mode.
Further, the main body of the preheating chamber is made of polyurethane heat-insulating materials, two ends of the preheating chamber are provided with translation gates, and the height of the layer of the preheating chamber is 2.5m, the length of the layer of the preheating chamber is 14m, and the width of the layer of the preheating chamber is 10m.
Further, 4 temperature and humidity sensors and 2 pressure difference sensors are fixedly arranged in the preheating chamber at fixed points; the 4 temperature and humidity sensors are arranged on the horizontal symmetry axis and the vertical symmetry axis in the preheating chamber, and the 2 pressure difference sensors are arranged near the two translation doors;
the combined air conditioning system is provided with 1 differential pressure sensor;
the outlet of the preheating chamber is provided with 1 outdoor temperature and humidity sensor;
1 wind speed sensor is respectively arranged at the air inlet of the air supply pipeline, the air inlet of the return air pipeline and the air inlet of the fresh air system;
meanwhile, 20 movable temperature and humidity sensors are arranged and are placed at a 'cold point' where the temperature and humidity are not easy to penetrate according to the placement position and the packaging condition of the articles;
all sensor signals are transmitted to the automatic control system in real time.
(III) beneficial effects
The beneficial effects of the invention are as follows:
the invention provides a control method of ethylene oxide sterilization pretreatment constant temperature and humidity, which adopts polyurethane heat preservation material as preheating chamber material, adopts a combined air conditioner and geothermal heat supply mode (the combined air conditioning and geothermal heat supply mode is a heat convection principle, the flow of damp and hot air can uniformly diffuse water vapor into the room, the geothermal heat supply is a heat radiation principle, the whole temperature is fast), and controls heat transportation and water vapor transportation, (when the preheating chamber is closed, the micro positive pressure of indoor damp and hot air is maintained, and the water vapor permeability is improved), and simultaneously utilizes a fixed and movable temperature and humidity sensor to monitor the surface temperature and humidity of the instrument to be sterilized in real time within a preset time to meet the requirement, thereby effectively reducing cold points;
when the door is opened during batch warehouse-out operation, the automatic control equipment can monitor the difference between the temperature and the humidity inside and outside the preheating chamber, regulate and control the air quantity of the air inlet of the air supply pipeline through algorithm control, increase the outdoor temperature and the numerical correction of the outdoor humidity, and timely compensate the heat loss and the water vapor loss. The whole system has high preheating efficiency in operation and reasonable energy utilization, and achieves the purposes of meeting the requirements that the surface temperature and humidity of medical instruments are subjected to a preheating process to achieve sterilization conditions and improving the efficiency of a subsequent ethylene oxide sterilization process.
Drawings
FIG. 1 is a schematic flow diagram of a preheating chamber system;
FIG. 2 is a schematic flow diagram of a combined air conditioning system;
FIG. 3 is a schematic flow diagram of a heat pump;
FIG. 4 is a schematic flow diagram of a geothermal circulation pump;
fig. 5 is a schematic diagram of a preheating chamber with full load.
[ reference numerals description ]
1: a combined air conditioning system; 11: a combined air conditioning unit; 111: an air conditioning steam inlet; 112: an air conditioner humidifier port; 113: a condensed water outlet; 1131: a heating coil condensate outlet; 1132: a humidifying coil condensed water outlet; 12: an air supply pipeline; 13: a return air duct; 14: a fresh air system; 15: grouping empty steam pipelines;
2: geothermal coiled pipe; 21: a geothermal cold water outlet; 22: a geothermal hot water inlet;
3: a heat exchanger; 31: a heat exchanger steam inlet; 32: a cold water inlet of the heat exchanger; 33: a hot water outlet of the heat exchanger; 34: cold water discharge of the heat exchanger; 35: a steam regulating valve; 36: a heat exchanger steam line;
4: a cylinder; 41: a main steam inlet; 42: a first steam outlet of the sub-cylinder; 43: a second steam outlet of the sub-cylinder;
5: a circulation water tank; 51: a first cold water inlet of the water tank; 52: a second cold water inlet of the water tank; 53: a hot water inlet of the water tank; 54: a tank hot water outlet; 55: a tank cold water outlet;
6: heating the pump; 61: a first heat pump; 62: a second heat pump;
7: a geothermal circulation pump; 71: a first geothermal circulation pump; 72: a second geothermal circulation pump;
8: a preheating chamber; 81: a translation door; 82: a column; 83: the wood row is placed.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1 to 4, the invention provides a control method for the constant temperature and humidity of the pretreatment of the sterilization of ethylene oxide, wherein the control system comprises a preheating chamber 8, a combined air conditioning system 1 for heating the air in the preheating chamber and supplementing the hot air with water vapor, a geothermal coil 2 for enhancing the heating of the preheating chamber 8 and an automatic control system for monitoring the temperature and humidity of the preheating chamber 8; the combined air conditioning system 1 and the geothermal coil 2 are arranged outside the preheating chamber 8, wherein the combined air conditioning system 1 is arranged in the middle of the top of the preheating chamber 8, and the geothermal coil 2 is arranged at the bottom of the preheating chamber 8;
as shown in fig. 2, the combined air conditioning system 1 includes a combined air conditioning unit 11, an air supply duct 12, a return air duct 13, a fresh air system 14, and a built-in fan.
The combined air conditioning unit 11 is internally provided with a steam coil pipe and a steam humidifier, and the corresponding outside is provided with an air conditioning steam inlet 111 and an air conditioning humidifier port 112 for entering steam into the combined air conditioning unit 11, which are respectively communicated with the steam coil pipe and the steam humidifier, so that main steam respectively enters the steam coil pipe and the steam humidifier from the air conditioning steam inlet 111 and the air conditioning humidifier port 112 through the air conditioning steam pipeline 15. The combined air conditioning system 1 heats air through the steam coil pipe, the indoor temperature can be controlled to be 30-50 ℃, and meanwhile, the steam humidifier supplements water vapor for the hot air, so that the indoor relative humidity of the preheating chamber 8 can be controlled to be 30-80%. Corresponding to the steam coil and the steam humidifier, a heating coil condensate outlet 1131 and a humidifying coil condensate outlet 1132 are further arranged outside the combined air conditioning unit 11, and condensate backwater in the combined air conditioning unit 11 is discharged from the heating coil condensate outlet 1131 and the humidifying coil condensate outlet 1132 respectively and is converged to the condensate outlet 113 to be discharged out of the combined air conditioning system 1 together, and then enters the circulating water tank 5 from the first water tank inlet 51 through a pipeline for recycling.
As shown in fig. 2, the air supply pipeline 12 and the return air pipeline 13 are connected with the combined air conditioning system 1, correspondingly, an air supply pipe network air inlet and a return air pipe network air inlet are arranged on the combined air conditioning unit 11, and are respectively connected with the air supply pipeline 12 and the return air pipeline 13, the other side of the return air pipe network air inlet is communicated with an internal fan, and the air supply pipe network air inlet is arranged at the center of the top of the preheating chamber 8, and is the inlet of the internal fan.
As shown in fig. 5, the preheating chamber 8 is constructed as a constant temperature and humidity room, the board room is constructed by using polyurethane heat-insulating materials, and two ends of the preheating chamber are provided with translation doors 81 made of light firewall materials. The preheating chamber 8 layers are 2.5m in height, 14m in length and 10m in width, 14 wood row placement positions 83 are symmetrically arranged inside, each wood row placement position 83 is used for placing wood rows with standard sizes of 1.2m multiplied by 1.2m, the full-load stacking height of sterilized cargoes is 1.7m, (full-load cargo volume calculation method: 7 multiplied by 4 multiplied by 1.2 multiplied by 1.7= 68.54 m) 3 ). According to the size of the preheating chamber 8, 8 air supply valves and square diffusers are evenly distributed in the air supply pipeline 12, and the air supply valves are manual and are arranged on the inner side of the square diffusers; 10 single-layer shutter air inlets are evenly distributed in the return air pipeline 13. Wherein, the air quantity of the air supply opening can be adjusted by an automatic control system to match the volume of the preheating chamber 8, so that the air quantity Q=10000 m 3 And/h, realizing the circulating ventilation times of 1-20 times per hour. Meanwhile, the built-in fan runs to circulate the air in the preheating chamber 8, and the fresh air system 14 is arrangedThe fresh air regulating valve is arranged and can supplement fresh air indoors, so that the external residual pressure of the combined air conditioning system 1 is more than 150Pa when the preheating chamber 8 is fully loaded, the indoor temperature can be controlled between 40 ℃ and 55 ℃ and the relative humidity is 30% -80%, and the heat preservation structure can maintain the positive pressure of 5Pa-10Pa in the preheating chamber 8, so that the heating rate is high, and the continuous preheating operation is adapted. Wherein, the interval between two adjacent wood rows place the position 83 1m, can let the sufficient space of loading and unloading electric motor car operate in preheating chamber 8, make things convenient for commodity circulation transportation, also can guarantee indoor damp and hot air circulation smooth and easy. Six upright posts 82 are also provided in the center of the preheating chamber 8 for supporting the combined air conditioning system 1 above the ceiling.
As described above, the combined air conditioning system 1 transfers temperature using the heat convection principle while bringing water vapor from the high air pressure region to the low air pressure region.
As shown in fig. 1, the heating mode of the constant temperature and humidity control system is provided with a combined air conditioning system 1 for providing hot and humid air for a preheating chamber 8 and a geothermal coil 2 for enhancing heating of the preheating chamber 8; the geothermal coil 2 is connected with a circulating water tank 5, a geothermal circulating pump 7 is connected between the circulating water tank 5 and the geothermal coil 2, the geothermal circulating pump 7 pumps hot water in the circulating water tank 5 from a hot water outlet 54 of the water tank to the geothermal coil 2 through a pipeline from a geothermal hot water inlet 22, geothermal backwater flows out from a geothermal cold water outlet 21 to enter the circulating water tank 5 through a pipeline from a second cold water inlet 52 of the water tank, and the geothermal circulating pump 7 provides power for circulating water between the circulating water tank 5 and the geothermal coil 2 so as to realize circulating supply of the circulating water tank 5 to the geothermal coil 2. The circulating water tank 5 is also connected with a heat exchanger 3, a heating pump 6 is connected between the heat exchanger 3 and the circulating water tank 5, the heating pump 6 pumps condensed backwater and geothermal backwater in the circulating water tank 5 from a water tank cold water outlet 55 to enter the heat exchanger 3 from a heat exchanger cold water inlet 32 through a pipeline, the heat exchanger 3 can heat the condensed backwater and geothermal backwater which circulate into the heat exchanger 3 from the heat exchanger cold water inlet 32 to 30-60 ℃ by utilizing the temperature of steam and combining self heating, then flows out from a heat exchanger hot water outlet 33 and enters the circulating water tank 5 from a water tank hot water inlet 53 through a pipeline, and the heating pump 6 provides power for the circulating flow of water between the circulating water tank 5 and the heat exchanger 3. This achieves the recycling of the condensate backwater from the circulation tank 5 to compensate for the loss of hot water in the geothermal coil 2. In order to control the heat exchange efficiency, a steam regulating valve 35 is further arranged on the steam inlet 31 of the heat exchanger, and the heat exchange efficiency can be regulated by controlling the opening degree of the steam regulating valve 35. In addition, while exchanging heat, a small amount of steam-cooled water is discharged from the heat exchanger cold water discharge port 34.
As shown in fig. 3 and 4, the geothermal circulating pump 7 includes a first geothermal circulating pump 71 and a second geothermal circulating pump 72, and the heating pump 6 also includes a first heating pump 61 and a second heating pump 62, which are both arranged in a standby mode, so that maintenance can be performed at any time without delay when working.
As shown in fig. 1, in actual operation, after the main steam enters the preheating chamber 8 through the main steam pipe network, the main steam enters the branch cylinder 4 arranged at the inlet of the system from the main steam inlet 41, then the branch cylinder 4 divides the main steam into two parts, and one part of the main steam exits from the first steam outlet 42 of the branch cylinder and enters the combined air conditioning system 1 from the two openings of the air conditioning steam inlet 111 and the air conditioning humidifier opening 112 through the air conditioning steam pipe network 15 so as to realize that the main steam provides a heat source for the combined air conditioning unit 11 and humidifies hot air; another part passes out of the branch cylinder second steam outlet 43 through the heat exchanger steam line 36 from the heat exchanger steam inlet 31 into the heat exchanger 3.
Meanwhile, temperature and humidity sensors and pressure difference sensors are distributed at the inlet and outlet of an air supply pipeline 12, an air return pipeline 13 and a combined air conditioning unit 11 in the preheating chamber 8, and particularly, the temperature and humidity sensors are mainly distributed at a door, a room and in the packaged objects to be sterilized, and 4 temperature and humidity sensors and 2 pressure difference sensors are fixedly arranged in the preheating chamber 8 at fixed points; the 4 temperature and humidity sensors are arranged on two symmetry axes which are horizontal and vertical in the preheating chamber 8, and the 2 pressure difference sensors are arranged near the two translation doors 81;
the combined air conditioning system 1 is provided with 1 differential pressure sensor;
the outlet of the preheating chamber 8 is provided with 1 outdoor temperature and humidity sensor;
1 wind speed sensor is respectively arranged at the air inlet of the air supply pipeline 12, the air inlet of the air return pipeline 13 and the air inlet of the fresh air system 14;
meanwhile, 20 movable temperature and humidity sensors are arranged and are placed at a 'cold point' where the temperature and humidity are not easy to penetrate according to the placement position and the packaging condition of the articles; therefore, preheating can be pre-judged in advance, the position of a cold point can be judged, and the phenomenon that articles with damp and hot not reaching standards enter a sterilization stage by mistake and the sterilization yield is affected is avoided.
All the sensor signals are transmitted to an automatic control system in real time, and the automatic control system can automatically detect and adjust the temperature and humidity changes of the preheating chamber 8, so that the temperature and humidity of the preheating chamber 8 are always kept within a required range.
The following is a constant temperature and humidity control method for ethylene oxide sterilization pretreatment, and the automatic control system calculates:
if the average temperature A at the entrance of the preheating chamber 8 is the highest value A1 and the lowest value A2;
average temperature B, highest value B1, lowest value B2 of preheating chamber 8;
average temperature C, highest value C1 and lowest value C2 in the package to be sterilized;
the average relative humidity X at the entrance of the preheating chamber 8, the highest value X1 and the lowest value X2;
the average relative humidity Y of the preheating chamber 8, the highest value Y1, the lowest value Y2;
the average humidity Z, the highest value Z1 and the lowest value Z2 in the package to be sterilized;
when the door is closed, the average temperature B of the preheating chamber 8 is in the interval of (a, B), and when the average temperature B of the preheating chamber 8 is smaller than a, the combined air conditioning system 1 and the geothermal coil 2 are started to heat the preheating chamber 8;
when the door is opened, when the difference between the average temperature B of the preheating chamber 8 and the average temperature A of the door opening of the preheating chamber 8 is larger than a threshold T1 and the average temperature B of the preheating chamber 8 is lower than the average value B of the temperature required by the preheating chamber 8, the combined air conditioning system 1 and the geothermal coil 2 are started to heat the preheating chamber 8;
when the difference between the average temperature B of the preheating chamber 8 and the average temperature C in the package to be sterilized is greater than a threshold value T1, the time for heating the preheating chamber 8 by the combined air conditioning system 1 and the geothermal coil 2 is prolonged;
when the average temperature B of the preheating chamber 8 is equal to or higher than the average value B of the temperatures required by the preheating chamber 8 in both the door closing operation and the door opening operation, the combined air conditioning system 1 and the geothermal coil 2 are stopped to heat the preheating chamber 8;
when the door is closed, the average relative humidity Y of the preheating chamber 8 is in the interval of (c, d), and when the average relative humidity Y of the preheating chamber 8 is smaller than c, the combined air conditioning system 1 is started to humidify the preheating chamber 8; when the average relative humidity Y of the preheating chamber 8 is greater than or equal to d, stopping the combined air conditioning system 1 from humidifying the preheating chamber 8;
when the door is opened, when the difference between the average relative humidity Y of the preheating chamber 8 and the average relative humidity X of the door opening of the preheating chamber 8 is larger than a threshold T2 and the average relative humidity Y of the preheating chamber 8 is lower than c, starting the combined air conditioning system 1 to humidify the preheating chamber 8; when the average relative humidity Y of the preheating chamber 8 is greater than or equal to d, stopping the combined air conditioning system 1 from humidifying the preheating chamber 8;
when the difference between the average relative humidity Y of the preheating chamber 8 and the average relative humidity Z within the packages to be sterilized is greater than the threshold T2, the time for the combined air conditioning system 1 to humidify the preheating chamber 8 is prolonged.
In this embodiment, when the door is closed, the average temperature B of the preheating chamber 8 should meet 47.5 ℃ < B <52.5 ℃, for example, B <47.5 ℃, the combined air conditioning system 1 and the geothermal coil 2 are started to heat the preheating chamber 8, B > 50 ℃, and the combined air conditioning system 1 and the geothermal coil 2 are stopped to heat the preheating chamber 8;
when the door is opened, if B-A is more than 2.5 ℃, B <50 ℃ starts the combined air conditioning system 1 and the geothermal coil 2 to heat the preheating chamber 8, B > =50 ℃ stops the combined air conditioning system 1 and the geothermal coil 2 to heat the preheating chamber 8, and if B is more than or equal to 50 ℃ stops the combined air conditioning system 1 and the geothermal coil 2 to heat the preheating chamber 8 after the door is closed;
the average temperature C in the package to be sterilized is in accordance with B-C <2.5 ℃, for example, the B-C is more than 2.5 ℃, and the heating time of the combined air conditioning system 1 and the geothermal coil 2 to the preheating chamber 8 is prolonged;
a1 The difference between A2, B1, B2, C1 and C2 and the average temperature A, B and C is too large to send out an alarm signal, and the cause of the problem should be checked;
when the door is closed, the average humidity Y in the preheating chamber 8 is 40% < Y <80%, for example, Y <40%, the combined air conditioning system 1 is started to humidify the preheating chamber 8, and Y +.80% stops the combined air conditioning system 1 from humidifying the preheating chamber 8.
When the door is opened, when Y-X is more than 5%, and Y <40% starts the combined air conditioning system 1 to humidify the preheating chamber 8, the door opening operation is completed, the preheating chamber 8 is closed, if Y is more than or equal to 80%, and the combined air conditioning system 1 stops humidifying the preheating chamber 8.
The average humidity Z in the package to be sterilized should be in accordance with Y-Z <5%, for example Y-Z >5%, to extend the time for the combined air conditioning system 1 to humidify the preheating chamber 8.
The difference between X1, X2, Y1, Y2, Z1 and Z2 and the average humidity X, Y and Z is too large, an alarm signal is sent out, and the system prompts the cause of the inspection problem.
In summary, the preheating chamber 8 adopts the heat supply mode of combining the geothermal coil 2 and the combined air conditioning system 1 to control heat transfer and water vapor transfer, firstly, the vapor provides a heat source for the combined air conditioning system 1 through the air separation cylinder 4 and humidifies hot air, thus, the combined air conditioning system 1 can provide damp and hot air, and secondly, the geothermal coil 2 enhances heating. Meanwhile, indoor temperature sensors, indoor humidity sensors, indoor pressure difference sensors, outdoor humidity sensors, outdoor temperature sensors, combined air conditioner wind speed sensors and combined air conditioner pressure difference sensors are distributed and installed in the preheating chamber 8; and then the sensor signal is connected into an automatic control system, and the temperature and humidity of the surface of the instrument can be monitored within a preset time by utilizing the fixed and movable temperature and humidity sensors for monitoring. When the preheating chamber 8 is closed, the micro-positive pressure of indoor hot and humid air is maintained, and the water vapor permeability is improved; when the preheating chamber 8 needs batch warehouse-out and door-opening operation, the automatic control equipment can monitor the temperature and humidity difference value inside and outside the preheating chamber 8, correct the outdoor temperature and the outdoor humidity through temperature and humidity change coupling control and algorithm control, regulate and control the opening of the air supply valve and timely compensate heat loss and water vapor loss. When the preheating chamber 8 is fully loaded, the indoor temperature can be controlled between 40 ℃ and 55 ℃ and the relative humidity is between 30% and 80%, and the heat insulation structure can maintain positive pressure of 5Pa to 10Pa, so that the heating rate is high, and the continuous preheating device is suitable for continuous preheating work. When the operation of batch warehouse-out and door opening is carried out, the automatic control equipment can monitor the difference value of the temperature and humidity inside and outside the preheating chamber 8, regulate and control the opening of the air supply valve, and timely compensate the heat loss and the water vapor loss.
The control principle of the automatic control system, the control interface of the combined air conditioning unit and the monitoring interface of the circulating water system are introduced as follows:
and (3) an automatic control system: the system is matched with a 1-side electrical control cabinet, and an electrical loop and a PLC controller are arranged in the system. The controller adopts Siemens S7-200smart series PLC, the operation panel adopts vinylon 10 inch color touch screen man-machine interface, the main equipment is configured with button indicator lamps, and all operations can be completed on each picture of the touch screen. In addition, the system is matched with 1 upper computer, is shared with an analysis room group air system, adopts Siemens industrial control computer and communicates with PLC Ethernet, and can realize functions of remote operation, parameter setting, data recording, alarm recording, report printing and the like. And 1 station 2KVAUPS is specially configured to supply power to a control system and an upper computer, and when the system is powered off, the UPS is used for supplying power uninterruptedly for at least 15 minutes, so that the system can safely close a valve and record accident data.
A plurality of groups of button switches and indicator lamps are arranged on the control cabinet door, and the sign indicates the functions of the control cabinet door. Comprises 1 air-building device, 2 geothermal circulating pumps and 2 heating circulating pumps.
The touch screen is connected with the PLC through an Ethernet (local area network, suitable for transmitting IP data), and under the normal condition of the system, the touch screen starts to work after the power of the equipment is connected, establishes communication connection with the PLC controller, and firstly enters a starting interface. All devices are only effective in touch screen control when the cabinet door change-over switch is switched to an automatic state.
The indoor environment information displays all indoor environment parameters including indoor temperature, indoor humidity, indoor and outdoor pressure difference and ventilation times.
A combined air conditioning system: the control interface of the combined air conditioning unit displays the state, operation parameters and the like of the related equipment of the combined air conditioning system 1. The fresh air valve, the steam heating valve and the steam humidifying valve can be set with automatic options or manual options through buttons, and the opening of the regulating valve can be manually input. In the automatic state, the regulating valve is controlled by an automatic program, and other parameters indicate actual operation data.
Circulating water system: the circulating water interface mainly displays the state of equipment, operation parameters and the like related to the circulating water tank 5. Wherein the steam adjusting valve 35 can set an automatic option or a manual option through a button, and the opening degree of the adjusting valve can be manually input. In the automatic state, the steam regulating valve 35 is controlled by an automatic program, and other parameters indicate actual operation data.
The trend picture can display the running curve of important parameters of the system, and can intuitively observe the data change trend within 10 hours.
The parameters are divided into an operation parameter and an alarm parameter, the operation parameter is mainly a system operation target set value, the alarm parameter sets a system operation limit value, once the alarm set value is exceeded, the system generates alarm information, and corresponding equipment automatically reacts.
The operation modes of the geothermal circulation pump 7 and the heating pump 6 are also classified into an automatic mode and a manual mode.
It should be noted that all devices can only start the system automatic running program in an automatic mode, and automatically work according to the set flow.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.
Claims (9)
1. A control method for the constant temperature and humidity of ethylene oxide sterilization pretreatment is characterized by comprising the following steps: the method comprises the steps of adopting an ethylene oxide sterilization pretreatment constant temperature and humidity control system, wherein the ethylene oxide sterilization pretreatment constant temperature and humidity control system comprises a preheating chamber (8), a combined air conditioning system (1) for heating air in the preheating chamber and supplementing hot air with water vapor, a geothermal coil (2) for enhancing heating of the preheating chamber (8) and an automatic control system for monitoring the temperature and humidity of the preheating chamber (8);
the combined air conditioning system (1) and the geothermal coil (2) are arranged outside the preheating chamber (8), the combined air conditioning system (1) is arranged at the middle position of the top of the preheating chamber (8), the combined air conditioning system (1) comprises a combined air conditioning unit (11), the combined air conditioning unit (11) is provided with an air conditioning steam inlet (111) and an air conditioning humidifier outlet (112) of the combined air conditioning unit (11) through a combined air conditioning steam pipeline (15), condensed backwater flows out of a heating coil condensed water outlet (1131) and a humidifying coil condensed water outlet (1132) of the combined air conditioning unit (11), and the heating coil condensed water outlet (1131) and the humidifying coil condensed water outlet (1132) are converged into a condensed water outlet (113);
the geothermal coil (2) is arranged at the bottom of the preheating chamber (8);
the automatic control system is used for automatically detecting and adjusting the temperature and humidity changes of the preheating chamber (8) so that the temperature and humidity of the preheating chamber (8) are always kept in a required range;
when the difference between the average temperature B of the preheating chamber (8) and the average temperature A of the gate of the preheating chamber (8) is larger than a threshold value T1, and the average temperature B of the preheating chamber (8) is lower than the preheating chamber #8) Average value B of the required temperature Are all When the combined air conditioning system (1) and the geothermal coil (2) are started to heat the preheating chamber (8);
when the difference between the average temperature B of the preheating chamber (8) and the average temperature C in the package to be sterilized is larger than the threshold value T1, the heating time of the preheating chamber (8) by the combined air conditioning system (1) and the geothermal coil (2) is prolonged;
when the difference between the average relative humidity Y of the preheating chamber (8) and the average relative humidity X of the gate of the preheating chamber (8) is greater than a threshold value T2, and the average relative humidity Y of the preheating chamber (8) is lower than the average value Y of the required relative humidity of the preheating chamber (8) Are all When the combined air conditioning system (1) is started to humidify the preheating chamber (8);
stopping the combined air conditioning system (1) from humidifying the preheating chamber (8) when the average relative humidity Y of the preheating chamber (8) is equal to the average relative humidity X of the door of the preheating chamber (8);
when the difference between the average relative humidity Y of the preheating chamber (8) and the average relative humidity Z in the package to be sterilized is larger than the threshold value T2, the time for the combined air conditioning system (1) to humidify the preheating chamber (8) is prolonged.
2. The method for controlling the constant temperature and humidity of the ethylene oxide sterilization pretreatment according to claim 1, wherein the method comprises the following steps: the combined air conditioning system (1) further comprises an air supply pipeline (12), an air return pipeline (13), a fresh air system (14) and an internal fan, wherein the air return pipeline (13) is communicated with the internal fan.
3. The method for controlling the constant temperature and humidity of the ethylene oxide sterilization pretreatment according to claim 1, wherein the method comprises the following steps: the ethylene oxide sterilization pretreatment constant temperature and humidity control system further comprises a heat exchanger (3), water circulated into the heat exchanger (3) is heated to 30-60 ℃, a heat exchanger steam inlet (31), a heat exchanger cold water inlet (32), a heat exchanger hot water outlet (33) and a heat exchanger cold water outlet (34) are arranged on the heat exchanger (3), and a steam regulating valve (35) is arranged on the heat exchanger steam inlet (31).
4. The method for controlling constant temperature and humidity of ethylene oxide sterilization pretreatment according to claim 3, wherein: the ethylene oxide sterilization pretreatment constant temperature and humidity control system further comprises a split cylinder (4), wherein the split cylinder (4) is arranged at a system inlet and divides main steam into two parts, the main steam enters the combined air conditioning system (1) and the heat exchanger (3) respectively, the split cylinder (4) is provided with a main steam inlet (41), a split cylinder first steam outlet (42) and a split cylinder second steam outlet (43), and the split cylinder first steam outlet (42) and the split cylinder second steam outlet (43) are communicated with the air conditioning steam inlet (111), the air conditioning humidifier outlet (112) and the heat exchanger steam inlet (31) through the group of air conditioning steam pipelines (15) and the heat exchanger steam pipelines (36) respectively.
5. The method for controlling constant temperature and humidity of ethylene oxide sterilization pretreatment according to claim 3, wherein: geothermal coil (2) are provided with geothermal cold water export (21) and geothermal hot water import (22), geothermal coil (2) intercommunication has circulation tank (5), circulation tank (5) are provided with first cold water import (51) of water tank, water tank second cold water import (52), water tank hot water import (53), water tank hot water export (54) and water tank cold water export (55), first cold water import (51) of water tank with condensate water export (113) are through pipeline intercommunication, water tank second cold water import (52) with geothermal cold water export (21) are through pipeline intercommunication, water tank hot water import (53) with water tank cold water export (55) respectively through the pipeline with heat exchanger hot water export (33) and heat exchanger cold water import (32) are through.
6. The method for controlling the constant temperature and humidity of the ethylene oxide sterilization pretreatment according to claim 5, wherein the method comprises the following steps: the heating pump (6) is arranged on a pipeline between the circulating water tank (5) and the heat exchanger (3), the heating pump (6) comprises a first heating pump (61) and a second heating pump (62), and the working modes of the heating pump (6) are divided into an automatic mode and a manual mode.
7. The method for controlling the constant temperature and humidity of the ethylene oxide sterilization pretreatment according to claim 5, wherein the method comprises the following steps: the geothermal circulating pump (7) is arranged on a pipeline between the circulating water tank (5) and the geothermal coil (2), the geothermal circulating pump (7) comprises a first geothermal circulating pump (71) and a second geothermal circulating pump (72), and the geothermal circulating pump (7) is divided into an automatic mode and a manual mode.
8. The control method for the sterilization pretreatment of ethylene oxide under constant temperature and humidity according to claim 2, characterized by comprising the following steps: the main body of the preheating chamber (8) is made of polyurethane heat-insulating materials, two ends of the preheating chamber (8) are provided with translation gates (81), and the height of the layer of the preheating chamber (8) is 2.5m, the length of the layer of the preheating chamber is 14m, and the width of the layer of the preheating chamber is 10m.
9. The method for controlling the constant temperature and humidity of the ethylene oxide sterilization pretreatment according to claim 8, wherein the method comprises the following steps: 4 temperature and humidity sensors and 2 pressure difference sensors are fixedly arranged in the preheating chamber (8) at fixed points; the 4 temperature and humidity sensors are arranged on two symmetry axes which are transverse and vertical in the preheating chamber (8), and the 2 pressure difference sensors are arranged near the two translation doors (81);
the combined air conditioning system (1) is provided with 1 differential pressure sensor;
the outlet of the preheating chamber (8) is provided with 1 outdoor temperature and humidity sensor;
1 wind speed sensor is respectively arranged at the air inlet of the air supply pipeline (12), the air inlet of the air return pipeline (13) and the air inlet of the fresh air system (14);
meanwhile, 20 movable temperature and humidity sensors are arranged and are placed at a 'cold point' where the temperature and humidity are not easy to penetrate according to the placement position and the packaging condition of the articles;
all sensor signals are transmitted to the autonomous system in real time.
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