CN111103141A - Safety system for fuel cell engine test and control method thereof - Google Patents
Safety system for fuel cell engine test and control method thereof Download PDFInfo
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- CN111103141A CN111103141A CN201911151312.1A CN201911151312A CN111103141A CN 111103141 A CN111103141 A CN 111103141A CN 201911151312 A CN201911151312 A CN 201911151312A CN 111103141 A CN111103141 A CN 111103141A
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Abstract
The invention discloses a safety system for a fuel cell engine test and a control method thereof, belonging to the technical field of engine tests. The safety system for the fuel cell engine test comprises an environment box, a pressure relief device and an air outlet, wherein the environment box is used for placing a fuel cell engine, and the top end of the environment box is provided with the pressure relief device and the air outlet for exhausting gas; a spiral finned tube heater disposed within the environmental chamber for heating a temperature within the environmental chamber; the control system is used for receiving signals and sending control signals; the monitoring system is in signal connection with the control system and is used for filling nitrogen into the environment box or starting the air outlet; and the fire fighting system is in signal connection with the control system and is used for starting the high-pressure water mist spray head at the top end of the environment box so as to spray water in the environment box for fire extinguishment. The advantages are that: the fuel cell engine can be ensured to complete test items under various simulation environments safely and reliably in the environment box.
Description
Technical Field
The invention relates to the technical field of engine tests, in particular to a safety system for a fuel cell engine test and a control method thereof.
Background
The fuel cell engine is taken as an important technical direction of a new energy automobile, has the characteristics of no mechanical loss in the reaction process, high energy conversion rate, only electricity, heat and water as products, stable operation and low noise, and is called as an ultimate environment-friendly engine; the development of fuel cell energy automobiles has very significant meaning for stabilizing energy supply, improving energy structure, developing low-carbon traffic, promoting international competitiveness and technological innovation and maintaining continuous development of automobile industry.
The fuel cell engine is a power generation device which directly converts hydrogen and oxygen into electric energy through electrochemical reaction, but hydrogen leakage or flame generated by combustion easily occurs in the working process of the fuel cell engine, so that hydrogen is exploded to cause safety accidents. Therefore, the development of the fuel cell engine must be tested and verified to ensure that the fuel cell engine can work safely and stably in various temperature, humidity and gas medium environments.
However, since it takes a lot of time and production cost to test a fuel cell engine in an actual environment, it is necessary to simulate various environments using an environment box to complete test verification, and finally put the fuel cell engine into practical use.
The safety system and the laboratory condition of the current fuel cell engine test have the defects of low safety, incapability of effectively ensuring the safety of testing personnel, equipment and a laboratory, poor environmental control and low testing efficiency, and the environment box does not have the functions of simulating sparks and preventing explosion, so that the safety and reliability test items of the fuel cell engine under various simulated environments can not be safely and reliably completed in the environment box.
In view of the above, it is desirable to design a safety system for fuel cell engine test and a control method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a safety system for fuel cell engine tests, which can ensure that a fuel cell engine can safely and reliably complete performance and reliability test items under various simulation environments in an environment box.
In order to achieve the purpose, the invention adopts the following technical scheme:
a safety system for fuel cell engine testing, comprising:
the environment box is used for placing a fuel cell engine and testing the fuel cell engine in the environment box, and the top end of the environment box is provided with a pressure relief device and an air outlet for exhausting gas;
a spiral finned tube heater disposed within the environmental chamber for heating a temperature within the environmental chamber;
the control system is used for receiving signals and sending control signals;
the monitoring system is in signal connection with the control system and is used for filling nitrogen into the environment box or starting the air outlet;
and the fire fighting system is in signal connection with the control system and is used for starting the high-pressure water mist spray head at the top end of the environment box so as to spray water in the environment box for fire extinguishment.
Preferably, a first sensor for detecting the hydrogen concentration, a second sensor for detecting the oxygen concentration, a third sensor for detecting the temperature, a fourth sensor for detecting the pressure in the environment box and a flame detector for detecting the flame during the combustion of the hydrogen are further arranged in the environment box.
Preferably, a temperature overtemperature protection switch is further arranged in the environment box and used for protecting the spiral finned tube heater so as to prevent the heating temperature of the spiral finned tube heater from being overhigh.
Preferably, a halogen lamp is further arranged in the environment box and used for lighting in the environment box, and a switch of the halogen lamp is arranged on the outer side of the environment box.
Preferably, the environment box is manufactured by adopting seamless welding, the outer side of the environment box is made of a steel plate, the steel plate is subjected to plastic spraying, and the inner side of the environment box is made of a stainless steel plate.
Preferably, the thermal insulation material of the environmental chamber is selected from rigid polyurethane foam.
Preferably, the top end of the pressure relief device is provided with a protective cover to prevent the top cover of the pressure relief device from flying out, the top cover is provided with a fifth sensor, and the fifth sensor is used for detecting whether the top cover is opened or not.
Preferably, still be provided with the fan in the environment case, the fan is used for gas exchange in the environment case, the drive fan pivoted motor is explosion proof machine, explosion proof machine sets up the outside of environment case, just when the impeller of fan rotates with the protection casing contactless.
Another objective of the present invention is to provide a method for controlling a safety system of a fuel cell engine test, wherein the safety system of the fuel cell engine test can ensure that the fuel cell engine can safely and reliably complete performance and reliability test items under various simulation environments in an environmental chamber.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method of a safety system of a fuel cell engine test comprises the safety system of the fuel cell engine test.
Preferably, the control method of the safety system for fuel cell engine testing further comprises four-stage prevention control:
primary prevention and control, namely when the concentration of hydrogen in the environment box reaches 20% of the lower limit of ignition, the control system gives an alarm;
the secondary prevention and control, when the concentration of the hydrogen in the environment box reaches 40% of the lower ignition limit or the temperature in the environment box reaches 150 ℃, the monitoring system fills nitrogen into the environment box and starts an exhaust outlet to exhaust the gas while the primary prevention and control is carried out;
the fire extinguishing system comprises a first-stage water mist sprayer, a second-stage water mist sprayer, a third-stage water mist sprayer and a fire extinguishing system, wherein the first-stage water mist sprayer and the second-stage water mist sprayer are connected in series;
and four-stage prevention and control, wherein when the pressure difference between the inside and the outside of the environment box reaches 0.02Bar, the pressure in the environment box drives the pressure relief device to be opened to rapidly release the pressure while the first-stage prevention and control, the second-stage prevention and control and the third-stage prevention and control are carried out.
The invention has the beneficial effects that:
the invention provides a safety system for a fuel cell engine test and a control method thereof. In the safety system for the fuel cell engine test, the pressure relief device and the air outlet are arranged at the top end of the environment box, so that gas in the environment box can be quickly exhausted, and the environment box has an explosion-proof function; meanwhile, the spiral finned tube heater is arranged in the environment box, so that the phenomenon that sparks are generated due to local overheating of the temperature in the environment box in the heating process can be avoided, and the environment box has a spark prevention function; meanwhile, the control system, the monitoring system and the fire fighting system are arranged, so that the monitoring system can charge nitrogen into the environment box to reduce the concentration of hydrogen or start an exhaust outlet to discharge the hydrogen when the hydrogen leaks in the test process of the environment box, and the hydrogen concentration is reduced so that the hydrogen cannot explode; or when hydrogen burns and produces flame, the fire extinguishing system can start the high-pressure water mist spray nozzle to spray water in the environment box to extinguish fire, so that the safety of the whole test is ensured. The fuel cell engine can safely and reliably complete performance and reliability test items under various simulation environments in the environment box, and meanwhile, the safety of testers, equipment and the whole laboratory can be effectively guaranteed.
Drawings
FIG. 1 is a front view of an environmental chamber according to an embodiment of the present invention;
FIG. 2 is a top view of an environmental chamber according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a control method of a safety system for a fuel cell engine test according to a second embodiment of the present invention;
fig. 4 is the contents of the fourth-stage prevention and control of the control method of the safety system for the fuel cell engine test according to the second embodiment of the present invention.
Description of reference numerals:
in the figure:
1-a first sensor; 2-high pressure water mist spray head; 3-a flame detector; 4-a pressure relief device; 5-a second sensor; 6-nitrogen inlet; 7-a motor; 8-air outlet.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. Like reference numerals refer to like elements throughout the specification.
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
Example one
The embodiment provides a safety system for fuel cell engine test, which comprises an environment box, as shown in fig. 1, for placing a fuel cell engine and enabling the fuel cell engine to be tested in the environment box. The environment box can provide various test environments to test the running performance of the fuel cell engine under various environments; to ensure the safety of the use, the fuel cell engine which runs normally after passing various test conditions can be put into practical use.
Specifically, a pressure relief device 4 and an air outlet 8 are arranged at the top end of the environment box and used for exhausting air. When abnormal gas occurs in the environment box, the gas in the environment box is more, and the air pressure is higher, the gas needs to be discharged from the pressure relief device 4 or the air outlet 8, so that the gas cannot explode, and the normal air pressure in the environment box is ensured. Wherein, the top of pressure relief device 4 is provided with the protection casing to avoid pressure relief device 4's top cap direct departure to hurt people. The top cover is provided with a fifth sensor, and the fifth sensor is used for detecting whether the top cover of the pressure relief device 4 is opened or not. In this embodiment, the fifth sensor is a displacement sensor.
Furthermore, the environment box is manufactured by integral seamless welding, and the integral sealing performance of the environment box can be better by adopting the seamless welding, so that the air leakage condition can not occur, and the test result is more accurate; meanwhile, water vapor and hydrogen can be prevented from leaking into the heat insulation board of the environment box, so that the heat insulation performance of the environment box is good. The outer side of the environment box is made of a steel plate, and the inner side of the environment box is made of a stainless steel plate; the high temperature resistance, high pressure resistance, low temperature resistance and corrosion resistance of the inner side and the outer side of the environmental box can be better; and the plastic spraying treatment is carried out on the steel plate on the outer side, so that the steel plate is isolated from air, the oxidation reaction of the steel plate is prevented, and the steel plate cannot rust.
In this embodiment, the insulation material of the environmental chamber is rigid polyurethane foam with a flame retardant rating of B2. The rigid polyurethane foam has the characteristics of good heat insulation effect, light weight, high specific strength and convenient construction. Further, the trompil that is used for line connection or gas exchange on the environment case lateral wall all does sealed the processing, and trompil department all installs electric valve, when the trompil need not use, directly uses electric valve to close it, easy operation, and can make the leakproofness of whole environment case better. In other embodiments, a manual valve can be installed at the opening.
Set up pressure relief device 4 and air exit 8 through the top at the environment case, select the material of environment case for the steel sheet, hard polyurethane foam is chooseed for use to insulation material, and seal up in trompil department, can make whole environment case have explosion-proof function to make the fuel cell engine can be in the environment case safe, reliable accomplish the test item of performance and reliability under the various simulated environment, can effectively guarantee the safety of testing personnel, equipment and whole laboratory simultaneously.
Further, a spiral finned tube heater is arranged in the environment box and used for heating the temperature in the environment box to enable the temperature to reach the required test temperature. Adopt spiral finned tube heater to heat, can avoid the heating temperature in the environment case inhomogeneous and the high temperature point appears, prevent the spark. The environment box is also internally provided with a temperature overtemperature protection switch matched with the spiral finned tube heater for protecting the spiral finned tube heater so as to prevent the spiral finned tube heater from generating sparks due to overhigh heating temperature.
In this embodiment, a halogen lamp is further disposed in the environmental chamber for illumination in the environmental chamber. The halogen lamp has the characteristics of explosion resistance, temperature resistance and moisture resistance. And the switch of the halogen lamp is arranged on the control panel at the outer side of the environment box so as to prevent the switch from being arranged at the inner side of the environment box and generating sparks during the use process.
Further, still be provided with the fan in the environment case, the fan is used for the gaseous exchange of environment incasement, and drive fan pivoted motor 7 is explosion-proof machine, and explosion-proof machine sets up in the outside of environment case, and the impeller of fan and the distance between the 4 top of pressure relief device 4 protection casings far away to make the impeller can not contact with the protection casing when rotating, avoid both contact friction in order to produce the spark. In this embodiment, the inside and outside of the environmental chamber are grounded to prevent sparks.
Through set up spiral finned tube heater, temperature overtemperature prote switch, halogen lamp and explosion proof machine in the environment case to all set up switch and explosion proof machine in the outside of environment case, can avoid the environment incasement to appear electric spark or naked light, make whole environment case have the spark prevention function, so that the fuel cell engine can be in the environment case safe, reliable completion under the various simulated environment performance and the test item of reliability, can effectively guarantee the safety of testing personnel, equipment and whole laboratory simultaneously.
Further, as shown in fig. 2, a first sensor 1 for detecting a hydrogen concentration in the environmental chamber, a second sensor 5 for detecting an oxygen concentration in the environmental chamber, a third sensor for detecting a temperature in the environmental chamber, and a fourth sensor for detecting a pressure in the environmental chamber are further provided in the environmental chamber. And a flame detector 3 for detecting flame generated when hydrogen in the environment box is combusted is also arranged in the environment box.
The concentration value of the hydrogen gas detected by the first sensor 1 is very important, and in the present embodiment, the number of the first sensors 1 is set to two. The two first sensors 1 are arranged, so that when one first sensor 1 fails, the other first sensor 1 can still work normally, and the reliability and safety of the environmental chamber are higher. In other embodiments, the number of the first sensors 1 may be set to one or three.
In this embodiment, the first sensor 1 is a hydrogen concentration sensor, the second sensor 5 is an oxygen concentration sensor, the third sensor is a temperature sensor, and the fourth sensor is a pressure sensor. The oxygen concentration sensor is used for detecting the concentration of oxygen in the environment box to ensure that the oxygen in the environment box is sufficient for testing personnel, and meanwhile, the oxygen concentration in the environment box cannot be too high for detection and control so as to avoid the combustion or explosion of hydrogen.
In this embodiment, the flame detector 3 is an infrared flame detector. The infrared flame detector can reduce misoperation caused by surrounding non-fire factors to the maximum extent, can achieve the maximum sensitivity by using the minimum consumption current, enhances the function of judging flame, and improves the reliability of flame detection.
Further, the safety system for the fuel cell engine test further comprises a control system, a monitoring system and a fire fighting system. Wherein, control system is used for receiving the signal of sensor and sends control signal, and control system control is connected with the siren, and when the hydrogen concentration of environment incasement was higher, control system control siren sent out acousto-optic warning to indicate that the experimenter has danger to take place. The monitoring system is in signal connection with the control system and is used for receiving signals of the control system and filling nitrogen into the environment box or starting the air outlet 8 so as to reduce the concentration of hydrogen and oxygen in the environment box and prevent the hydrogen and oxygen from exploding; and a nitrogen inlet 6 is formed in the side wall of the environment box, and the monitoring system fills nitrogen into the environment box through the nitrogen inlet 6. The fire-fighting system is in signal connection with the control system and is used for receiving the signal of the control system and starting the high-pressure water mist spray head 2 arranged at the top end of the environment box so as to spray water to extinguish fire in the environment box.
Wherein, a locking button is arranged in the control system. The locking button is in control connection with a box door of the environment box, when the environment box closes the box door and starts to perform a test, the locking button in the control system is pressed, the box door is directly locked, and a tester can not open the box door any more; after the test is finished, the locking button is pressed again to unlock the box door, and at the moment, a tester can open the box door; the safety of the test is further ensured.
In this embodiment, the quantity of the thin water smoke shower nozzle 2 of high pressure is provided with four, and four thin water smoke shower nozzles 2 of high pressure set up four corners on environment case top respectively to make whole environment incasement homoenergetic by even water spray, make the fire control effect better. In other embodiments, the number of high-pressure water mist heads 2 may be two, three or five.
By arranging the sensor, the control system, the monitoring system and the fire fighting system, wherein the control system can timely and accurately receive signals of the sensor so as to ensure that the control system can send out sound and light alarm when hydrogen leaks in the test process of the environment box, and meanwhile, the monitoring system can charge nitrogen into the environment box to reduce the concentration of the hydrogen or start the exhaust outlet 8 to discharge the hydrogen so as to reduce the concentration of the hydrogen and prevent the hydrogen from exploding; or when hydrogen burning produces flame, the fire extinguishing system can start the high-pressure water mist spray head 2 to spray water in the environment box to extinguish fire, so as to ensure the safety of the whole test. The fuel cell engine can safely and reliably complete performance and reliability test items under various simulation environments in the environment box, and meanwhile, the safety of testers, equipment and the whole laboratory can be effectively guaranteed.
Example two
In this embodiment, a method for controlling a safety system of a fuel cell engine test is provided, which includes the safety system of the fuel cell engine test in the first embodiment.
Specifically, as shown in fig. 4, the control method of the safety system of the fuel cell engine test further includes four stages of prevention control: primary prevention and control, secondary prevention and control, tertiary prevention and control and quaternary prevention and control. Wherein, the primary prevention and control, when the first sensor 1 detects that the hydrogen concentration in the environmental chamber reaches 20% of the lower limit value of hydrogen ignition, the control system controls the alarm to send out sound and light alarm, and the tester can remotely check and verify whether hydrogen leaks or other faults occur through the camera.
The secondary prevention and control, when the first sensor 1 detects that the hydrogen concentration in the environment box reaches 40% of the lower limit value of hydrogen ignition, or when the third sensor detects that the temperature in the environment box is more than or equal to 150 ℃, the control system controls the fuel cell engine to automatically stop, cuts off a power supply and a hydrogen source, and sends a hydrogen concentration signal to the monitoring system while starting the primary prevention and control; the monitoring system automatically fills nitrogen into the environment box through the nitrogen inlet 6 or quickly fills nitrogen into the environment box in a manual mode so as to reduce the concentration of hydrogen and oxygen in the environment box, and opens the air outlet 8 to quickly discharge the gas in the environment box to an air exhaust pipeline outside the environment box; meanwhile, the testers are evacuated from the environment box, and the condition in the environment box is remotely monitored through the camera.
And the three-stage prevention and control is realized, when the flame detector 3 detects flame generated when hydrogen is combusted in the environment box, the control system transmits a detection signal to the fire-fighting system when starting the first-stage prevention and control and the second-stage prevention and control, and the fire-fighting system starts the four high-pressure water mist nozzles 2 on the top end of the environment box to spray water for fire extinguishment.
And four-stage prevention and control, wherein when hydrogen in the environment box explodes to enable the pressure difference value of the inner side and the outer side of the environment box to rise sharply, the fourth sensor detects the pressure in the environment box to obtain the pressure difference value of the inner side and the outer side of the environment box to reach 0.02Bar, the top cover of the pressure relief device 4 can be directly flicked by the larger pressure in the environment box while the first-stage prevention and control, the second-stage prevention and control and the third-stage prevention and control are started, so that the pressure in the environment box is released rapidly. Wherein, the protection casing on the top cap can avoid the interior great pressure of environment box directly to fly the top cap bullet of pressure relief device 4 and hinder the people, and the protection casing can not the butt top cap simultaneously to make the top cap pop out smoothly, with the pressure release of environment box. Wherein all detection and control signals are transmitted to a general monitoring room so that a tester can check through remote monitoring.
The specific control process of the control method of the safety system for the fuel cell engine test of the embodiment comprises the following steps: as shown in fig. 3, when the first sensor 1 detects that the hydrogen concentration in the environmental chamber reaches 20% of the lower limit value of the hydrogen ignition, the primary prevention control is activated. When the first sensor 1 detects that the hydrogen concentration in the environmental chamber reaches 40% of the lower limit value of hydrogen ignition, or when the third sensor detects that the temperature in the environmental chamber is 150 ℃ or higher, either of the conditions is reached, the primary prevention control and the secondary prevention control are started. When the flame detector 3 detects that the flame is generated when hydrogen is burnt in the environment box, the first-stage prevention and control, the second-stage prevention and control and the third-stage prevention and control are started. When the fourth sensor detects the pressure in the environment box to obtain that the pressure difference between the inner side and the outer side of the environment box reaches 0.02Bar, the first-stage prevention and control, the second-stage prevention and control, the third-stage prevention and control and the fourth-stage prevention and control are started. Wherein all detection and control signals are transmitted to a general monitoring room so that a tester can check through remote monitoring.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A safety system for fuel cell engine testing, comprising:
the environment box is used for placing a fuel cell engine and testing the fuel cell engine in the environment box, and the top end of the environment box is provided with a pressure relief device (4) and an air outlet (8) for exhausting gas;
a spiral finned tube heater disposed within the environmental chamber for heating a temperature within the environmental chamber;
the control system is used for receiving signals and sending control signals;
the monitoring system is in signal connection with the control system and is used for filling nitrogen into the environment box or starting the air outlet (8);
and the fire fighting system is in signal connection with the control system and is used for starting the high-pressure water mist spray head (2) at the top end of the environment box so as to spray water in the environment box for fire extinguishment.
2. The fuel cell engine test safety system according to claim 1, wherein a first sensor (1) for detecting a hydrogen concentration, a second sensor (5) for detecting an oxygen concentration, a third sensor for detecting a temperature, a fourth sensor for detecting a pressure in the environmental chamber, and a flame detector (3) for detecting a flame at the time of combustion of hydrogen are further provided in the environmental chamber.
3. The fuel cell engine test safety system of claim 1, wherein a temperature overtemperature protection switch is further provided in the environmental chamber for protecting the spiral fin tube heater from an excessive heating temperature thereof.
4. The fuel cell engine test safety system of claim 1, wherein a halogen lamp is further provided in the environmental chamber for illumination in the environmental chamber, and a switch of the halogen lamp is provided outside the environmental chamber.
5. The fuel cell engine test safety system of claim 1, wherein the environmental chamber is made by seamless welding, the outside of the environmental chamber is made of a steel plate on which plastic injection is performed, and the inside of the environmental chamber is made of a stainless steel plate.
6. The fuel cell engine test safety system of claim 1, wherein the environmental chamber insulation is rigid polyurethane foam.
7. The fuel cell engine test safety system according to claim 1, wherein a top end of the pressure relief device (4) is provided with a protective cover to prevent a top cover of the pressure relief device (4) from flying out, and a fifth sensor is provided on the top cover and used for detecting whether the top cover is opened or not.
8. The fuel cell engine test safety system according to claim 7, wherein a blower is further provided in the environmental chamber, the blower is used for gas exchange in the environmental chamber, a motor (7) for driving the blower to rotate is an explosion-proof motor, the explosion-proof motor is arranged outside the environmental chamber, and an impeller of the blower does not contact the protective cover when rotating.
9. A method of controlling a safety system for a fuel cell engine test, comprising a safety system for a fuel cell engine test as claimed in any one of claims 1 to 8.
10. The method of controlling a safety system for a fuel cell engine test of claim 9, further comprising four-stage prevention control:
primary prevention and control, namely when the concentration of hydrogen in the environment box reaches 20% of the lower limit of ignition, the control system gives an alarm;
the secondary prevention and control, when the concentration of the hydrogen in the environment box reaches 40% of the lower ignition limit or the temperature in the environment box reaches 150 ℃, the monitoring system fills nitrogen into the environment box and starts an air outlet (8) to discharge the gas while the primary prevention and control is carried out;
the three-stage prevention and control, when flame during hydrogen combustion is detected, the fire-fighting system starts the high-pressure water mist spray head (2) to spray water for fire extinguishment while the primary prevention and control and the secondary prevention and control are carried out;
and four-stage prevention and control, wherein when the pressure difference between the inside and the outside of the environment box reaches 0.02Bar, the pressure in the environment box drives the pressure relief device (4) to be opened to rapidly release the pressure while the first-stage prevention and control, the second-stage prevention and control and the third-stage prevention and control are carried out.
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| CN112924876A (en) * | 2021-02-24 | 2021-06-08 | 重庆阿泰可科技股份有限公司 | Environmental test equipment suitable for hydrogen fuel new energy automobile engine |
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| CN116251320A (en) * | 2023-05-11 | 2023-06-13 | 宁德时代新能源科技股份有限公司 | Fire-fighting method, device, equipment, storage medium and product of environment test incubator |
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