CN114379878A - Constant-temperature and constant-humidity control system and method for ethylene oxide sterilization pretreatment - Google Patents
Constant-temperature and constant-humidity control system and method for ethylene oxide sterilization pretreatment Download PDFInfo
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- CN114379878A CN114379878A CN202111672151.8A CN202111672151A CN114379878A CN 114379878 A CN114379878 A CN 114379878A CN 202111672151 A CN202111672151 A CN 202111672151A CN 114379878 A CN114379878 A CN 114379878A
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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 constant-temperature constant-humidity control system and method for ethylene oxide sterilization pretreatment. The control system comprises a preheating chamber, a combined air conditioning system, a geothermal coil and an automatic control system; the combined air conditioning unit is arranged in the middle of the top of the preheating chamber and comprises an air conditioning steam inlet, an air conditioning humidifier port, a heating coil condensed water outlet and a humidifying condensed water outlet; the geothermal coil is arranged at the bottom of the preheating chamber; the automatic control system keeps the temperature and the humidity of the preheating chamber within the required range all the time. Therefore, the control system can monitor the temperature and humidity of the surface of the instrument to be sterilized in real time within preset time to meet the requirements; when the medical instruments are taken out of the warehouse in batches and opened, the automatic control system can monitor the temperature and humidity difference inside and outside the preheating chamber and correct the temperature and humidity difference, so that the aim of meeting the requirement that the medical instruments achieve sterilization conditions through preheating the surface temperature and humidity 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 constant-temperature constant-humidity control system and method for ethylene oxide sterilization pretreatment.
Background
Ethylene oxide is a broad-spectrum sterilizing agent, and can kill various microorganisms including spore, tubercle bacillus, bacteria, virus, fungi, etc. at normal temperature, and the ethylene oxide sterilizing device is a sterilizing device using ethylene oxide as sterilizing agent.
The ethylene oxide sterilizing device is used as key equipment of a disposable sterile medical instrument production enterprise, special requirements are provided for installation, operation, use and management, the temperature and the humidity before sterilization are key important parameters influencing the ethylene oxide sterilizing effect, and researches show that when the relative humidity is less than 30%, the spore residual curve is similar to a concave shape, and when the relative humidity reaches 50% -70%, the spore residual curve basically presents or is close to a linear shape. In addition, the penetration rate of water vapor is weak relative to ethylene oxide, the water vapor can not penetrate products with the same thickness as ethylene oxide at the same time and temperature, but the ethylene oxide can interact with microorganisms only after water exists and a ring-shaped structure is opened, so that a constant-temperature constant-humidity preheating chamber is provided as an intermediate link in a sterilization process in a pretreatment stage, the temperature and humidity of the sterilized products are controlled in advance, and a cold point is eliminated so as to prepare for entering an ethylene oxide sterilization link formally.
Currently, the products are preheated mostly by adopting a pretreatment cabinet, and the products are transported to an ethylene oxide sterilization cabinet for sterilization operation after being preheated by the pretreatment cabinet. Whether the product can really reach the preset temperature and humidity is difficult to master by the pretreatment cabinet, and when the product enters the sterilization cabinet from the pretreatment cabinet after being preheated, the temperature and humidity of the product are changed due to the opening of the pretreatment cabinet, so that the final sterilization result is influenced.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a constant temperature and humidity control system and a constant temperature and humidity control method for ethylene oxide sterilization pretreatment.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a constant temperature and humidity control system and method for ethylene oxide sterilization pretreatment, wherein the control system comprises a preheating chamber, a combined air conditioning system, a geothermal coil pipe and an automatic control system, wherein the combined air conditioning system is used for heating air in the preheating chamber and supplementing water vapor for hot air;
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 port, main steam enters the combined air conditioning unit through an air conditioning steam pipeline, condensate water flows out of a heating coil condensate water outlet and a humidifying condensate water outlet of the combined air conditioning unit, and the heating coil condensate water outlet and the humidifying condensate water outlet are converged into a condensate water outlet;
the geothermal coil is arranged at the bottom of the preheating chamber;
the automatic control system is used for automatically detecting the temperature and humidity change of the preheating chamber and adjusting the temperature and humidity change, so that the temperature and humidity of the preheating chamber are always kept in a required range.
Furthermore, the combined air-conditioning system also comprises an air supply pipeline, a return air pipeline, a fresh air system and a built-in fan, wherein the return air pipeline is communicated with the built-in fan.
The heat exchanger is used for heating water circulated in the heat exchanger to 30-60 ℃, and is provided with a heat exchanger steam inlet, a heat exchanger cold water inlet, a heat exchanger hot water outlet and a heat exchanger cold water outlet, wherein the heat exchanger steam inlet is provided with a steam regulating valve.
The split-cylinder is provided with a main steam inlet, a first steam outlet of the split-cylinder and a second steam outlet of the split-cylinder, and the first steam outlet of the split-cylinder and the second steam outlet of the split-cylinder are respectively 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 a heat exchanger steam pipeline.
Further, geothermal coil is provided with geothermal cold water export and geothermal hot water import, geothermal coil intercommunication has circulation tank, circulation tank is provided with the first cold water import of water tank, the cold water import of water tank second, water tank hot water import, water tank hot water export and water tank cold water export, the first cold water import of water tank passes through the pipeline intercommunication with the comdenstion water export, water tank second cold water import passes through the pipeline intercommunication with geothermal cold water export, water tank hot water import and water tank cold water export respectively through pipeline and heat exchanger hot water export and heat exchanger cold water import intercommunication.
Further, be provided with the heat pump on the pipeline between circulating water tank and the heat exchanger, the heat pump includes first heat pump and second heat pump, and the heat pump working method divide into automatic mode and manual mode.
Further, a geothermal circulating pump is arranged on a pipeline between the circulating water tank and the geothermal coil pipe, the geothermal circulating pump comprises a first geothermal circulating pump and a second geothermal circulating pump, and the working mode of the geothermal circulating pump is divided into an automatic mode and a manual mode.
Furthermore, the main building of the preheating chamber is made of polyurethane heat-insulating materials, two ends of the preheating chamber are provided with translation doors, and the height of the preheating chamber layer is 2.5m, the length is 14m, and the width is 10 m.
Further, 4 temperature and humidity sensors and 2 differential pressure sensors are fixedly installed in a fixed point mode in the preheating chamber; 4 temperature and humidity sensors are arranged on two symmetrical axes which are vertical and horizontal in the preheating chamber, and 2 pressure difference sensors are arranged near the two translation doors;
the combined air-conditioning system is provided with 1 differential pressure sensor;
1 outdoor temperature and humidity sensor is arranged at the outlet of the preheating chamber;
respectively installing 1 wind speed sensor at an air inlet of an air supply pipeline, an air inlet of an air return pipeline and an air inlet of a fresh air system;
meanwhile, 20 movable temperature and humidity sensors are arranged and placed at a cold spot where the predicted temperature and humidity are not easy to penetrate according to the placement position of the articles and the packaging condition;
and transmitting all sensor signals to an automatic control system in real time.
The following control method is used for the ethylene oxide sterilization pretreatment constant temperature and humidity control system:
the automatic control system calculates to obtain: when the difference between the average temperature B of the preheating chamber and the average temperature A of the door opening of the preheating chamber is greater than a threshold value T1, and the average temperature B of the preheating chamber is lower than the average value B of the temperature required by the preheating chamberAre all made ofWhen the preheating chamber is heated, the combined air conditioning system and the heating coil are started;
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 value T1, the time for the combined air conditioning system and the heating coil to heat 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 larger than the threshold T2, and the average relative humidity Y of the preheating chamber is lower than the average value Y of the relative humidity required by the preheating chamberAre all made ofWhen the preheating chamber is in use, the combined air conditioning system is started to humidify the preheating chamber;
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, the combined air conditioning system is stopped 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 larger than a threshold value T2, the humidifying time of the preheating chamber by the combined air conditioning system is prolonged.
(III) advantageous effects
The invention has the beneficial effects that:
the invention provides a constant temperature and humidity control system and method for ethylene oxide sterilization pretreatment, wherein a polyurethane thermal insulation material is used as a preheating chamber material, and a combined air conditioner and geothermal heating combined heating mode is adopted (group air heating is a heat convection principle, and humid and hot air flows and can uniformly diffuse water vapor indoors, geothermal heating is a thermal radiation principle, so that the overall temperature lifting speed is high), heat delivery and water vapor delivery are controlled, (when the preheating chamber is closed, the micro positive pressure of indoor humid and hot air is maintained, and the water vapor permeability is improved), and meanwhile, a fixed temperature and humidity sensor and a movable temperature and humidity sensor are used for monitoring the surface temperature and humidity of an instrument to be sterilized in real time to meet requirements in a preset time, so that cold spots are effectively reduced;
when the door is opened during the operation of opening the door after the door is taken out of the warehouse in batches, the automatic control equipment can monitor the temperature and humidity difference inside and outside the preheating chamber, regulate and control the air quantity of an air inlet of the air supply pipeline through algorithm control, increase the numerical correction of outdoor temperature and outdoor humidity, and compensate heat loss and water vapor loss in time. The whole system is high in operation preheating efficiency and reasonable in energy utilization, and the purposes of meeting the requirement that the surface temperature and humidity of medical instruments after a preheating process reach sterilization conditions and improving the efficiency of a subsequent ethylene oxide sterilization process are achieved.
Drawings
FIG. 1 is a schematic flow diagram of a preheat 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 heat circulating pump;
fig. 5 is a schematic view of the preheating chamber with full load of goods.
[ description of reference ]
1: a combined air conditioning system; 11: a combined air conditioning unit; 111: an air conditioner steam inlet; 112: an air conditioner humidifier port; 113: a condensed water outlet; 1131: a heating coil condensed water outlet; 1132: a humidifying coil condensed water outlet; 12: an air supply duct; 13: a return air duct; 14: a fresh air system; 15: an empty steam pipeline is assembled;
2: a geothermal coil; 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: a cold water outlet of the heat exchanger; 35: a steam regulating valve; 36: a heat exchanger steam line;
4: a cylinder is divided; 41: a primary steam inlet; 42: a first steam outlet of the steam distributing cylinder; 43: a second steam outlet of the steam distributing cylinder;
5: a circulating 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 hot water outlet of the water tank; 55: a water tank cold water outlet;
6: a heat pump; 61: a first heat pump; 62: a second heat pump;
7: a geothermal circulating pump; 71: a first geothermal circulating pump; 72: a second geothermal circulating pump;
8: a preheating chamber; 81: a sliding door; 82: a column; 83: the wood raft is placed.
Detailed Description
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can 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. 1-4, the present invention provides a constant temperature and humidity control system and method for ethylene oxide sterilization pretreatment, wherein the control system comprises a preheating chamber 8, a combined air conditioning system 1 for heating air in the preheating chamber and supplementing water vapor to the hot air, a geothermal coil 2 for enhancing heating of the preheating chamber 8, and an automatic control system for monitoring 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 duct 13, a fresh air system 14, and a built-in fan.
The combined air conditioning unit 11 is provided with a steam coil and a steam humidifier inside, and the corresponding outside is provided with an air conditioning steam inlet 111 and an air conditioning humidifier port 112, where steam enters the combined air conditioning unit 11 and is respectively communicated with the steam coil and the steam humidifier, so that main steam enters the steam coil 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, can control the indoor temperature at 30-50 ℃, and simultaneously the steam humidifier supplements water vapor for hot air, so that the indoor relative humidity of the preheating chamber 8 can be controlled at 30-80%. Corresponding to the steam coil and the steam humidifier, a heating coil condensate outlet 1131 and a humidification condensate outlet 1132 are further arranged outside the combined air conditioning unit 11, condensate water in the combined air conditioning unit 11 is discharged from the heating coil condensate outlet 1131 and the humidification condensate outlet 1132 respectively and converged to the condensate water 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 cold water inlet 51 of the water tank through a pipeline for recycling.
As shown in fig. 2, the air supply duct 12 and the air return duct 13 are connected to the combined air conditioning system 1, and correspondingly, the combined air conditioning unit 11 is provided with an air inlet of an air supply pipe network and an air inlet of an air return pipe network, which are respectively connected to the air supply duct 12 and the air return duct 13, and the other side of the air inlet of the air return pipe network is communicated with a built-in fan, which is arranged in the center of the top of the preheating chamber 8, and the inlet of the built-in fan is the air inlet of the air return pipe network.
As shown in fig. 5, the preheating chamber 8 is mainly constructed as a constant temperature and humidity room, a polyurethane thermal insulation material is used for constructing a board room, and two ends of the room are provided with translation doors 81 made of a light firewall material. The preheating chamber has 8 layers with height of 2.5m, length of 14m and width of 10m, and is provided with 14 wood row placing positions 83 symmetrically inside, each wood row placing position 83 is used for placing wood rows with standard size of 1.2m multiplied by 1.2m, the sterilized goods are fully loaded and stacked with height of 1.7m (the volume calculation method of the fully loaded goods is that 7 multiplied by 4 multiplied by 1.2 multiplied by 1.7 is 68.54 m)3). According to the size of the preheating chamber 8, 8 air supply valves and a square air diffuser are evenly distributed in an air supply pipeline 12, wherein the air supply valves are manual and are arranged on the inner side of the square air diffuser; 10 single-layer louver air openings are evenly distributed in the air return pipeline 13. Wherein, the air quantity of the air supply outlet can be adjusted by an automatic control system and is matched with the volume of the preheating chamber 8, so that the air quantity Q is 10000m3And h, realizing the circulation air exchange times of 1-20 times per hour. Meanwhile, the built-in fan operates to circulate the air in the preheating chamber 8, the fresh air system 14 is provided with a fresh air regulating valve which can supplement fresh air indoors, so that the residual pressure outside the combined air-conditioning system 1 during operation is greater than 150Pa, when the preheating chamber 8 is fully loaded, the indoor temperature can be controlled between 40-55 ℃ and the relative humidity is 30% -80%, and the heat insulation structure can maintain the positive pressure of 5-10 Pa in the preheating chamber 8, so that the heating rate is high, and the combined air-conditioning system is suitable for continuous preheating work. Wherein, the interval 1m between two adjacent raft places 83, can let the sufficient space of handling electric motor car operation in preheating chamber 8, makes things convenient for the commodity circulation transportation, also can guarantee that indoor damp and hot air circulation is smooth and easy. Six uprights 82 are also provided centrally in the preheating chamber 8 in order to support the combined air conditioning system 1 above the ceiling.
In the above, the combined air conditioning system 1 transfers the temperature by using the heat convection principle, and simultaneously transfers the water vapor from the high pressure zone to the low pressure zone.
As shown in fig. 1, the heating mode of the constant temperature and humidity control system includes a combined air conditioning system 1 for providing hot and humid air to 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 out of a water tank hot water outlet 54 and pumps the hot water into the geothermal coil 2 from a geothermal hot water inlet 22 through a pipeline, geothermal return water flows out of a geothermal cold water outlet 21 and enters the circulating water tank 5 from a water tank second cold water inlet 52 through a pipeline, and the geothermal circulating pump 7 provides power for circulating flow of 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 condensed return water and the geothermal return water in the circulating water tank 5 are pumped out from a cold water outlet 55 of the water tank and are pumped into the heat exchanger 3 from a cold water inlet 32 of the heat exchanger through a pipeline by the heating pump 6, the heat exchanger 3 heats the condensed return water and the geothermal return water which circulate from the cold water inlet 32 of the heat exchanger to the heat exchanger 3 to 30-60 ℃ by utilizing the temperature of steam and combining self heating, then the condensed return water and the geothermal return water flow out from a hot water outlet 33 of the heat exchanger and enter the circulating water tank 5 from a hot water inlet 53 of the water tank 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 enables the recycle water tank 5 to recover the above-mentioned condensate return water 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 exchanger efficiency can be regulated by controlling the opening degree of the steam regulating valve 35. In addition, a small amount of steam cooled into water is discharged from the cold water outlet 34 of the heat exchanger simultaneously with the heat exchange.
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 heat pump 6 also includes a first heat pump 61 and a second heat pump 62, both of which are used in one-by-one arrangement to facilitate work and maintenance without delay.
As shown in fig. 1, in actual operation, after entering 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, and then the branch cylinder 4 divides the main steam into two parts, 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 through the combined air steam pipeline 15 from the air conditioning steam inlet 111 and the air conditioning humidifier port 112 to supply heat source to the combined air conditioning unit 11 and humidify the hot air; the other part of the partial cylinder passes out of the second steam outlet 43 of the partial cylinder 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 differential pressure sensors are distributed and installed at the inlets and outlets of the air supply pipeline 12, the air return pipeline 13 and the combined chamber air conditioning unit 11 in the preheating chamber 8, specifically, the temperature and humidity sensors are mainly distributed in the door, the room and the packaged object to be sterilized, and 4 temperature and humidity sensors and 2 differential pressure sensors are fixedly installed in the preheating chamber 8 in a fixed point mode; 4 temperature and humidity sensors are arranged on two symmetrical axes which are vertical and horizontal in the preheating chamber 8, and 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;
1 outdoor temperature and humidity sensor is arranged at the outlet of the preheating chamber 8;
respectively installing 1 wind speed sensor 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 placed at a cold spot where the predicted temperature and humidity are not easy to penetrate according to the placement position of the articles and the packaging condition; therefore, preheating completion can be judged in advance, the position of a cold spot can also be judged, and the phenomenon that the sterilization yield is influenced by mistakenly entering a sterilization stage for articles with substandard damp and heat is avoided.
The signals of all the sensors are transmitted to the automatic control system in real time, and the automatic control system can automatically detect the temperature and humidity change of the preheating chamber 8 and adjust the temperature and humidity change, so that the temperature and humidity of the preheating chamber 8 are always kept in a required range.
The following constant temperature and humidity control method for ethylene oxide sterilization pretreatment is obtained by calculation of an automatic control system:
if the average temperature A of the door of the preheating chamber 8 is A, the highest value A1 and the lowest value A2;
the average temperature B of the preheating chamber 8, the maximum value B1, the minimum value B2;
average temperature C, highest value C1 and lowest value C2 in the package to be sterilized;
average relative humidity X at the door 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 maximum value Y1, the minimum value Y2;
average relative humidity Z in the packaged object to be sterilized, highest value Z1 and lowest value Z2;
during door closing operation, 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 less than a, the combined air conditioning system 1 and the heating 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 at the door opening of the preheating chamber 8 is greater than a threshold value T1 and the average temperature B of the preheating chamber 8 is lower than the average value B of the temperatures required by the preheating chamber 8, the combined air conditioning system 1 and the heating 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 which the preheating chamber 8 is heated by the combined air conditioning system 1 and the heating coil 2 is prolonged;
when the average temperature B of the preheating chamber 8 is more than or equal to the average value B of the temperature required by the preheating chamber 8 no matter the door is closed or opened, the combined air conditioning system 1 and the heating 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 less 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 larger than or equal to d, the combined air-conditioning system 1 is stopped to humidify 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 at the door of the preheating chamber 8 is greater than the threshold T2, and the average relative humidity Y of the preheating chamber 8 is lower 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 larger than or equal to d, the combined air-conditioning system 1 is stopped to humidify 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 greater than the threshold value T2, the time for which the combined air conditioning system 1 humidifies the preheating chamber 8 is prolonged.
In this embodiment, during the closing operation, the average temperature B of the preheating chamber 8 should meet 47.5 ℃ < B <52.5 ℃, if B <47.5 ℃, the combined air conditioning system 1 and the heating coil 2 are started to heat the preheating chamber 8, B ≧ 50 ℃, and the combined air conditioning system 1 and the heating coil 2 are stopped to heat the preheating chamber 8;
when the door is opened, if B-A is more than 2.5 ℃, the combined air-conditioning system 1 and the heating coil 2 are started to heat the preheating chamber 8 at the temperature of B <50 ℃, the combined air-conditioning system 1 and the heating coil 2 are stopped to heat the preheating chamber 8 at the temperature of B > 50 ℃, and after the door is closed, the combined air-conditioning system 1 and the heating coil 2 are stopped to heat the preheating chamber 8 if B > 50 ℃;
the average temperature C in the package to be sterilized is in accordance with B-C <2.5 ℃, for example, B-C >2.5 ℃, the time for heating the preheating chamber 8 by the combined air conditioning system 1 and the heating coil 2 is prolonged;
if the difference between the A1, A2, B1, B2, C1 and C2 and the average temperature A, B and C is too large, an alarm signal is sent, and the cause of the problem needs to be checked;
during door closing operation, the average relative humidity Y in the preheating chamber 8 is in accordance with 40% < Y < 80%, if Y < 40%, the combined air-conditioning system 1 is started to humidify the preheating chamber 8, and Y ≧ 80% the combined air-conditioning system 1 is stopped to humidify the preheating chamber 8.
When the door is opened, when Y-X is more than 5% and Y is less than 40%, the combined air conditioning system 1 is started to humidify the preheating chamber 8, the door is opened, if Y is larger than or equal to 80%, the combined air conditioning system 1 is stopped to humidify the preheating chamber 8, and the door is closed to close the preheating chamber 8.
The average humidity Z in the package to be sterilized should be such that Y-Z < 5%, e.g. Y-Z > 5%, extends the time for which the combined air conditioning system 1 humidifies the preheating chamber 8.
And if the difference between the 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 a heating mode of combining the geothermal coil 2 and the combined air conditioning system 1 to control heat transmission and water vapor transmission, firstly, the steam provides a heat source for the combined air conditioning system 1 through the steam distributing cylinder 4 and humidifies hot air, thus, the combined air conditioning system 1 can provide damp hot air, and secondly, the geothermal coil 2 enhances heating. Meanwhile, an indoor temperature sensor, an indoor humidity sensor, an indoor differential pressure sensor, an outdoor humidity sensor, an outdoor temperature sensor, a combined air conditioner wind speed sensor and a combined air conditioner differential pressure sensor are distributed and installed in the preheating chamber 8; and then the sensor signal is accessed into an automatic control system, and the temperature and humidity on the surface of the instrument can be monitored to meet the requirement within 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 the indoor hot and humid air is maintained, and the water vapor permeability is improved; when the preheating chamber 8 needs to be taken out of the warehouse in batches and opened, the automatic control equipment can monitor the temperature and humidity difference 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 degree of the air supply valve and compensate heat loss and water vapor loss in time. When the preheating chamber 8 is fully loaded, the indoor temperature can be controlled to be 40-55 ℃, the relative humidity is 30-80%, and the heat-insulating structure can maintain the positive pressure of 5-10 Pa, so that the heating rate is high, and the continuous preheating work is adapted. When the door is opened during the operation of batch delivery, the automatic control equipment can monitor the difference value of the temperature and the humidity inside and outside the preheating chamber 8, regulate and control the opening of the air supply valve and compensate the heat loss and the water vapor loss in time.
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:
an automatic control system: the system is matched with a 1-surface electric control cabinet, and an electric loop and a PLC (programmable logic controller) are arranged in the system. The controller adopts Siemens S7-200 smart series PLC, the operation panel adopts a vinylon 10-inch color touch screen man-machine interface, the main equipment is provided with a button indicator light, and all the operations can be completed on each picture of the touch screen. In addition, 1 matched upper computer is shared with an analysis room air-conditioning system, a Siemens industrial personal computer is adopted to communicate with the PLC Ethernet, and the functions of remote operation, parameter setting, data recording, alarm recording, report printing and the like can be realized. The special configuration of 12 KVA UPS for control system and host computer power supply, when the system outage, UPS uninterrupted power supply, at least 15 minutes ensure that the system can the safe shut-off valve, the accident data of record simultaneously.
The control cabinet door is provided with a plurality of groups of button switches and indicator lamps, and the label indicates the function of the control cabinet. Comprises 1 air-mixing device, 2 geothermal circulating pumps and 2 heating circulating pumps.
The touch screen is connected with the PLC through an Ethernet (local area network, which is suitable for transmitting IP data), and under the normal condition of the system, after the power supply of the equipment is switched on, the touch screen starts to work, establishes communication connection with the PLC, and firstly enters a starting interface. All equipment are only effective under the switch of cabinet door change over switch switches to "automatic" state, touch screen control.
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 relevant 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 degree of the adjusting 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.
A circulating water system: the circulating water interface mainly displays the state, operation parameters and the like of equipment related to the circulating water tank 5. Wherein the steam regulating valve 35 can be set to an automatic option or a manual option through a button, and the opening degree of the regulating 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 operation curve of important parameters of the system, and the data change trend within 10 hours can be visually observed.
The parameters are divided into operation parameters and alarm parameters, the operation parameters are mainly system operation target set values, the alarm parameters set system operation limiting values, once the alarm parameters exceed the alarm set values, the system generates alarm information, and corresponding equipment automatically responds.
In addition, the operation modes of the geothermal heat circulating pump 7 and the heat pump 6 are also classified into an automatic mode and a manual mode.
It should be noted that all devices can start the automatic operation program of the system only in an automatic mode, and automatically work according to the set flow.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (10)
1. A constant temperature and humidity control system for ethylene oxide sterilization pretreatment is characterized in that: the system comprises a preheating chamber (8), a combined air conditioning system (1) for heating air in the preheating chamber and supplementing water vapor for the hot air, 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 in the middle 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 port (112) through which main steam enters the combined air-conditioning unit (11) through a combined air steam pipeline (15), a heating coil condensate outlet (1131) and a humidifying condensate outlet (1132) through which condensate water flows out of the combined air-conditioning unit (11), and the heating coil condensate outlet (1131) and the humidifying condensate outlet (1132) are converged into a condensate 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 the temperature and humidity change of the preheating chamber (8) and adjusting the temperature and humidity change, so that the temperature and humidity of the preheating chamber (8) are always kept in a required range.
2. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: the combined air conditioning system (1) further comprises an air supply pipeline (12), an air return pipeline (13), a fresh air system (14) and a built-in fan, wherein the air return pipeline (13) is communicated with the built-in fan.
3. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: the heat exchanger is characterized by further comprising a heat exchanger (3), the 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 constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: the combined air-conditioning system further comprises a steam-distributing cylinder (4), the steam-distributing cylinder (4) is arranged at an inlet of the system, main steam is divided into two parts and enters the combined air-conditioning system (1) and the heat exchanger (3) respectively, the steam-distributing cylinder (4) is provided with a main steam inlet (41), a first steam outlet (42) of the steam-distributing cylinder and a second steam outlet (43) of the steam-distributing cylinder, and the first steam outlet (42) of the steam-distributing cylinder and the second steam outlet (43) of the steam-distributing cylinder are communicated with the air-conditioning steam inlet (111), the air-conditioning humidifier port (112) and the heat exchanger steam inlet (31) through the air-distributing steam pipeline (15) and the heat exchanger steam pipeline (36) respectively.
5. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: the geothermal coil (2) is provided with a geothermal cold water outlet (21) and a geothermal hot water inlet (22), the geothermal coil (2) is communicated with a circulating water tank (5), the circulating water tank (5) is provided with a first water tank cold water inlet (51), a second water tank cold water inlet (52), a hot water tank inlet (53), a hot water tank outlet (54) and a cold water tank outlet (55), the first water tank cold water inlet (51) is communicated with the condensed water outlet (113) through a pipeline, the second water tank cold water inlet (52) is communicated with the geothermal cold water outlet (21) through a pipeline, and the hot water tank inlet (53) and the cold water tank outlet (55) are communicated with the heat exchanger hot water outlet (33) and the heat exchanger cold water inlet (32) through pipelines respectively.
6. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: circulating water tank (5) with be provided with heat pump (6) on the pipeline between heat exchanger (3), heat pump (6) include first heat pump (61) and second heat pump (62), heat pump (6) working method divide into automatic mode and manual mode.
7. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: the geothermal circulating system is characterized in that a 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 working modes of the geothermal circulating pump (7) are divided into an automatic mode and a manual mode.
8. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: the preheating chamber (8) is mainly made of polyurethane heat-insulating materials, two ends of the preheating chamber (8) are provided with translation doors (81), and the preheating chamber (8) is 2.5m high in floor height, 14m long and 10m wide.
9. The constant temperature and humidity control system for ethylene oxide sterilization pretreatment according to claim 1, characterized in that: 4 temperature and humidity sensors and 2 differential pressure sensors are fixedly arranged in the preheating chamber (8) in a fixed point mode; 4 temperature and humidity sensors are arranged on two symmetrical axes which are vertical and horizontal in the preheating chamber (8), and 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;
1 outdoor temperature and humidity sensor is arranged at the outlet of the preheating chamber (8);
1 air speed sensor is respectively arranged at an air inlet of the air supply pipeline (12), an air inlet of the air return pipeline (13) and an air inlet of the fresh air system (14);
meanwhile, 20 movable temperature and humidity sensors are arranged and placed at a cold spot where the predicted temperature and humidity are not easy to penetrate according to the placement position of the articles and the packaging condition;
and transmitting all sensor signals to the automatic control system in real time.
10. The control method for the ethylene oxide sterilization pretreatment constant temperature and humidity control system according to any one of claims 1 to 9, characterized in that:
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 value T1, and the average temperature B of the preheating chamber (8) is lower than the average value B of the required temperature of the preheating chamber (8)Are all made ofWhen the preheating chamber (8) is heated, the combined air-conditioning system (1) and the heating coil (2) are started;
-extending the time during which the combined air-conditioning system (1) and the heating coil (2) heat the preheating compartment (8) when the difference between the average temperature B of the preheating compartment (8) and the average temperature C inside the package to be sterilised is greater than the threshold value T1;
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 value T2, the preheating is carried outThe average relative humidity Y of the hot chamber (8) is lower than the average value Y of the relative humidity required by the preheating chamber (8)Are all made ofWhen the preheating chamber (8) is in a humidifying state, the combined air-conditioning system (1) is started;
-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 at 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 greater than the threshold value T2, the time for which the preheating chamber (8) is humidified by the combined air conditioning system (1) is prolonged.
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