阅读说明：本技术 一种氢火焰离子化检测器的自动点火控制方法 (Automatic ignition control method of hydrogen flame ionization detector ) 是由 应刚 李彦妍 吴明所 周立 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种氢火焰离子化检测器的自动点火控制方法,其特征在于,包括以下步骤：步骤S1,启动自检程序；步骤S2,自检合格后,进行点火操作,并在经过第二预定时间时关闭点火开关；步骤S3,采集连续第七预定时间内的信号输出数据,根据信号输出数据判断点火是否成功,当判断为成功时,设置火焰状态为开；当判断为否时判定点火失败；步骤S4,当判定点火失败后,进一步判断点火次数是否小于等于点火次数上限,并在进一步判断为是时,重新执行步骤S2,三路气体分别为可燃气、尾吹气以及助燃气；本发明的自动点火控制方法用于控制氢火焰离子化检测器的自动点火,且控制更精确、更省时、更方便、更节约气体。(The invention discloses an automatic ignition control method of a hydrogen flame ionization detector, which is characterized by comprising the following steps of: step S1, starting a self-checking program; step S2, after the self-checking is qualified, the ignition operation is carried out, and the ignition switch is closed when a second preset time passes; step S3, collecting signal output data in a seventh continuous preset time, judging whether ignition is successful according to the signal output data, and setting the flame state to be on when the ignition is successful; judging that the ignition fails when the judgment result is no; step S4, after judging that the ignition fails, further judging whether the ignition frequency is less than or equal to the ignition frequency upper limit, and if so, re-executing the step S2, wherein the three gases are respectively combustible gas, tail blowing gas and combustion-supporting gas; the automatic ignition control method is used for controlling the automatic ignition of the hydrogen flame ionization detector, and has the advantages of more accurate control, time saving, convenience and gas saving.)

1. An auto-ignition control method of a hydrogen flame ionization detector is characterized by comprising the following steps:

step S1, starting a self-checking program, wherein the self-checking program comprises a step of judging whether an ignition ready condition is reached, if yes, setting an ignition state as a ready state, otherwise, setting the ignition state as a preparation, and judging whether the ignition ready condition is met within first preset time again, if yes, setting the ignition state as the ready state, otherwise, judging that the ignition fails;

step S2, after the ignition state is the ready state, carrying out ignition operation, and closing an ignition switch when a second preset time passes;

step S3, collecting signal output data in a seventh continuous preset time, judging whether ignition is successful according to the signal output data, and setting the flame state to be on when the ignition is successful; judging that the ignition fails when the judgment result is no;

and step S4, after the ignition failure is judged, further judging whether the ignition frequency is less than or equal to the ignition frequency upper limit, and if so, re-executing the step S2, wherein the three paths of gases are combustible gas, tail blowing gas and combustion-supporting gas respectively.

2. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 1, wherein before starting the self-test procedure, the auto-ignition control method further comprises the steps of:

and step S0, collecting signal output data within the seventh preset time, judging whether the ignition is successful according to the signal output data, setting the flame state to be on when the judgment is yes, then entering the ending state or the next detection period, and executing the step S1 when the judgment is no.

3. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 1 or 2, wherein in the step S2, the ignition operation is to adjust a three-way gas flow, turn on an ignition switch to ignite and gradually increase the three-way gas flow multiple times.

4. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 3, wherein the step S2 includes the following sub-steps:

step S2-1, setting the three paths of gas flow rates as a first flow rate value;

step S2-2, turning on the ignition switch, setting the ignition state as ignition and passing a third preset time;

step S2-3, increasing the three-way gas flow to a second flow value and passing a fourth preset time;

step S2-4, increasing the three paths of gas flow into a third flow value and passing a fifth preset time;

and step S2-5, when the three paths of gas flows are reduced to the user set value and the sixth preset time is passed, the ignition switch is closed.

5. The automatic ignition control method of a hydrogen flame ionization detector as claimed in claim 4, wherein setting the three gas flows as the first flow value means setting the combustible gas flow as 35-45ml/min, the tail gas flow as 0ml/min, the combustion-supporting gas as 255-265 ml/min;

increasing the flow of the three paths of gas to the second flow value means that the flow of the combustible gas is set to be 35-45ml/min, the flow of the tail gas is set to be 5-10ml/min, and the flow of the combustion-supporting gas is set to be 255-265 ml/min;

increasing the three paths of gas flow to the third flow value means that the combustible gas flow is set to be 45-55ml/min, the tail gas blowing flow is set to be 15-25ml/min, and the combustion-supporting gas flow is set to be 295-305 ml/min.

6. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 1 or 2, wherein in said step S1, said ignition ready condition includes that the detector temperature is equal to or higher than the ready temperature and the combustible gas flow rate and the combustion-supporting gas flow rate are equal to or higher than the ready gas flow rate value and the combustion-supporting gas flow rate value, respectively.

7. The method as claimed in claim 6, wherein the ready temperature is 145-155 ℃, the ready flow value of the combustible gas is 15-25ml/min, and the ready flow value of the combustion-supporting gas is 195-205 ml/min.

8. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 1 or 2, wherein the three-way gas flow is controlled by an electronic flow control valve.

9. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 1 or 2, wherein in the step S3, it is judged whether ignition is successful by judging whether the signal output data within a predetermined ratio satisfies a set ignition lower limit value.

10. The auto-ignition control method of a hydrogen flame ionization detector as claimed in claim 1 or 2, wherein in step S4, when it is further determined that the ignition frequency is greater than the upper limit of the ignition frequency, the ignition state is set as ignition failure, and the three-way gas flow is set to zero, and then the end state or the next detection period is entered.

Technical Field

The invention relates to the technical field of gas chromatography detection, in particular to an automatic ignition control method of a hydrogen flame ionization detector.

Background

The Flame Ionization Detector (FID) is one of the most commonly used detectors in gas chromatography detectors, and has the outstanding advantages of high sensitivity, wide linear range, stability, reliability, and convenient operation, and has response to almost all organic substances.

The smooth completion of the ignition step is the premise of normal work of the FID detector, and in the traditional gas chromatography FID design, the ignition is usually completed in a manual mode, and the specific steps are as follows: after the temperature of the sample injector, the temperature of the column box and the temperature of the detector meet requirements, three paths of gas including combustible gas (hydrogen), combustion-supporting gas (air) and tail blowing gas (nitrogen) are started, then the gas flow of each path is adjusted through the adjusting valve, whether a gas path system is normal or not is observed, finally, the ignition switch is started to ignite, and after the ignition switch is started, whether ignition is successful or not is observed manually.

The determination of whether the flame is lit is generally made by the following steps: a cold metal bright surface (such as stainless steel pliers) is placed against the FID outlet, and if water drops condense on the surface, the ignition is successful.

However, manual control of the ignition conditions inevitably has a lot of uncertainty, and takes a lot of time, is easy to make mistakes, and is tedious in work; moreover, the manual control mode is increasingly unable to meet the requirements of laboratories, so that a method capable of solving the problems needs to be found.

Disclosure of Invention

In view of the above, there is a need to overcome at least one of the above-mentioned drawbacks in the prior art, and the present invention provides an auto-ignition control method for a hydrogen flame ionization detector, comprising the steps of: step S1, starting a self-checking program, wherein the self-checking program comprises a step of judging whether an ignition ready condition is reached, if yes, setting an ignition state as a ready state, otherwise, setting the ignition state as a ready state, and judging whether the ignition ready condition is met within a first preset time again, if yes, setting the ignition state as the ready state, if no, judging that the ignition is failed, and executing the step S4; step S2, after the ignition state is the ready state, carrying out ignition operation, and closing an ignition switch when a second preset time passes; step S3, collecting signal output data in a seventh continuous preset time, judging whether ignition is successful according to the signal output data, setting a flame state to be on when the ignition is successful, and then entering an ending state or the next detection period; when the judgment is no, ignition failure is judged, and then the process proceeds to step S4; and step S4, after the ignition failure is judged, further judging whether the ignition frequency is less than or equal to the ignition frequency upper limit, and if so, executing the step S2 again, otherwise, setting the ignition state as the ignition failure, returning the flow of the three paths of gases to zero, and then entering an ending state or the next detection period, wherein the three paths of gases are combustible gas, tail blowing gas and combustion-supporting gas respectively.

According to the background art of the patent, manual control of the ignition conditions inevitably has a lot of uncertainty, and can take a lot of time, easily make mistakes, and have tedious work, and the requirements of a laboratory can not be met more and more; the automatic ignition control method of the hydrogen flame ionization detector disclosed by the invention judges whether the ignition is successful or not according to the comparison of the signal output data and the ignition lower limit, can accurately and quickly judge whether the ignition is successful or not, and is simple to operate; moreover, the ignition frequency is preset, whether the ignition frequency exceeds the ignition frequency upper limit or not is automatically judged after the ignition fails, if the ignition frequency exceeds the ignition frequency upper limit, the three paths of air flows are closed, so that unnecessary attempts are avoided when the ignition cannot be performed due to the conditions of machine faults and the like, the time is saved, and the effect of saving gas is achieved; meanwhile, hydrogen accumulation is easy to detonate, the three paths of gas flow are automatically controlled to return to zero, gas is saved, hydrogen accumulation is avoided, and detection safety is improved.

In addition, the automatic ignition control method of the hydrogen flame ionization detector disclosed by the invention also has the following additional technical characteristics:

further, before the self-test procedure is started (i.e., before step S1), the auto-ignition control method further includes the steps of:

step S0: and collecting signal output data within the seventh preset time, judging whether the ignition is successful according to the signal output data, setting the flame state to be on when the judgment is yes, then entering an ending state or the next detection period, and executing the step S1 when the judgment is no.

Further, the first preset time is 25-35s, and the seventh preset time is greater than or equal to 10 s.

Further, the first predetermined time is 30s, and the seventh predetermined time is 10 s.

Further, in the step S2, the ignition operation is to adjust the three-way gas flow, turn on an ignition switch to ignite and gradually increase the three-way gas flow multiple times.

Through increasing three routes gas flow gradually, not only make the gas flow change of gas circuit more stable, better trigger signal has increased the ignition success rate moreover.

Further, the step S2 includes the following sub-steps: step S2-1, setting the flow rates of the three paths of gases as a first flow rate value, step S2-2, starting the ignition switch, setting the ignition state as ignition and passing a third preset time; the method comprises the steps of S2-3, increasing the three-way gas flow to a second flow value and passing a fourth preset time, S2-4, increasing the three-way gas flow to a third flow value and passing a fifth preset time, and S2-5, reducing the three-way gas flow to a user setting value and turning off the ignition switch when a sixth preset time passes.

Further, the third predetermined time is 4.5 to 5.5s, the fourth predetermined time is 1.5 to 2.5s, the fifth predetermined time is 1.5 to 2.5s, and the sixth predetermined time is 4.5 to 5.5 s.

Further, the third predetermined time is 5s, the fourth predetermined time is 5s, the fifth predetermined time is 2s, and the sixth predetermined time is 5 s.

Further, setting the three-way gas flow as the first flow value means setting the combustible gas flow as 35-45ml/min, setting the tail gas flow as 0ml/min, and setting the combustion-supporting gas as 255-265 ml/min; increasing the flow of the three paths of gas to the second flow value means that the flow of the combustible gas is set to be 35-45ml/min, the flow of the tail gas is set to be 5-10ml/min, and the flow of the combustion-supporting gas is set to be 255-265 ml/min; increasing the three paths of gas flow to the third flow value means that the combustible gas flow is set to be 45-55ml/min, the tail gas blowing flow is set to be 15-25ml/min, and the combustion-supporting gas flow is set to be 295-305 ml/min.

Further, setting the three gas flows as the first flow value means setting the combustible gas flow as 40ml/min, setting the tail gas blowing flow as 0ml/min, and setting the combustion-supporting gas as 260 ml/min; increasing the flow of the three paths of gas to the second flow value means that the flow of the combustible gas is set to be 40ml/min, the flow of the tail gas is set to be 10ml/min, and the flow of the combustion-supporting gas is set to be 260 ml/min; increasing the three paths of gas flow to the third flow value means setting the combustible gas flow to be 50ml/min, the tail gas blowing flow to be 20ml/min and the combustion-supporting gas flow to be 300 ml/min.

In step S2-3, the tail blow flow is increased to trigger the output signal to generate the signal output data.

Further, in the step S1, the ignition ready condition includes that the detector temperature is greater than or equal to the ready temperature, and the combustible gas flow and the combustion-supporting gas flow are greater than or equal to a combustible gas ready flow value and a combustion-supporting gas ready flow value, respectively.

Furthermore, the ready temperature is 145-155 ℃, the ready flow value of the combustible gas is 15-25ml/min, and the ready flow value of the combustion-supporting gas is 195-205 ml/min.

Further, the ready temperature is 150 ℃, the ready flow value of the combustible gas is 20ml/min, and the ready flow value of the combustion-supporting gas is 200 ml/min.

Further, the three paths of gas flows are controlled by an electronic flow control valve.

The gas flow of combustible gas (hydrogen), combustion-supporting gas (air) and tail blowing gas (nitrogen) is controlled by an Electronic Flow Control (EFC) technology, the manual adjustment of three paths of gas flow through an adjusting valve is avoided, the operation is convenient, the time is saved, and the error rate is low.

Further, in the step S3, it is determined whether or not the ignition is successful by determining whether or not a predetermined proportion of the signal output data satisfies (i.e., is equal to or greater than) a set ignition lower limit value.

Still further, the predetermined ratio is 90%.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a hydrogen flame ionization detector provided by the present invention; and

fig. 2 is an operation flowchart of an auto-ignition control method of a hydrogen flame ionization detector according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout; the embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "lateral", "vertical", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The invention adopts the conception that an Electronic Flow Control (EFC) technology is adopted to control the flow of three paths of gases, and whether the ignition is successful is judged according to signal output data; and when the continuous ignition failure times exceed the ignition time upper limit, three paths of gas flows are closed, and meanwhile, during ignition, gas fluid is gradually increased for many times, so that the ignition control of the automatic ignition control method is more accurate, more time-saving, more convenient and more gas-saving.

FIG. 1 is a schematic diagram of a hydrogen flame ionization detector provided by the present invention; and fig. 2 is an operation flow chart of an auto-ignition control method of the hydrogen flame ionization detector provided by the invention.

As shown in the drawings, according to an embodiment of the present invention, an auto-ignition control method of a hydrogen flame ionization detector includes the steps of: step S1, starting a self-checking program, wherein the self-checking program comprises a step of judging whether an ignition ready condition is reached, if yes, setting an ignition state as a ready state, otherwise, setting the ignition state as a ready state, and judging whether the ignition ready condition is met within a first preset time again, if yes, setting the ignition state as the ready state, if no, judging that the ignition is failed, and executing the step S4; step S2, after the ignition state is the ready state, carrying out ignition operation, and closing an ignition switch when a second preset time passes; step S3, collecting signal output data in a seventh continuous preset time, judging whether ignition is successful according to the signal output data, setting a flame state to be on when the ignition is successful, and then entering an ending state or the next detection period; when the judgment is no, ignition failure is judged, and then the process proceeds to step S4; and step S4, after the ignition failure is judged, further judging whether the ignition frequency is less than or equal to the ignition frequency upper limit, and if so, executing the step S2 again, otherwise, setting the ignition state as the ignition failure, returning the flow of the three paths of gases to zero, and then entering an ending state or the next detection period, wherein the three paths of gases are combustible gas, tail blowing gas and combustion-supporting gas respectively.

According to the background art of the patent, manual control of the ignition conditions inevitably has a lot of uncertainty, and can take a lot of time, easily make mistakes, and have tedious work, and the requirements of a laboratory can not be met more and more; the automatic ignition control method of the hydrogen flame ionization detector disclosed by the invention judges whether the ignition is successful or not according to the comparison of the signal output data and the ignition lower limit, can accurately and quickly judge whether the ignition is successful or not, and is simple to operate; moreover, the ignition frequency is preset, whether the ignition frequency exceeds the ignition frequency upper limit or not is automatically judged after the ignition fails, if the ignition frequency exceeds the ignition frequency upper limit, the three paths of air flows are closed, so that unnecessary attempts are avoided when the ignition cannot be performed due to the conditions of machine faults and the like, the time is saved, and the effect of saving gas is achieved; meanwhile, hydrogen accumulation is easy to detonate, the three paths of gas flow are automatically controlled to return to zero, gas is saved, hydrogen accumulation is avoided, and detection safety is improved.

In addition, the automatic ignition control method of the hydrogen flame ionization detector disclosed by the invention also has the following additional technical characteristics:

according to some embodiments of the present invention, before the self-test procedure is started (i.e., before step S1), the auto-ignition control method further comprises the steps of:

step S0: and collecting signal output data within the seventh preset time, judging whether the ignition is successful according to the signal output data, setting the flame state to be on when the judgment is yes, then entering an ending state or the next detection period, and executing the step S1 when the judgment is no.

According to some embodiments of the invention, the first predetermined time is 25-35s and the seventh predetermined time is equal to or greater than 10 s.

According to an embodiment of the invention, the first predetermined time is 30s and the seventh predetermined time is 10 s.

According to some embodiments of the invention, in the step S2, the igniting operation is to adjust the three-way gas flow, turn on an ignition switch to ignite and gradually increase the three-way gas flow multiple times.

Through increasing three routes gas flow gradually, not only make the gas flow change of gas circuit more stable, better trigger signal has increased the ignition success rate moreover.

According to some embodiments of the invention, the step S2 includes the following sub-steps: step S2-1, setting the flow rates of the three paths of gases as a first flow rate value, step S2-2, starting the ignition switch, setting the ignition state as ignition and passing a third preset time; the method comprises the steps of S2-3, increasing the three-way gas flow to a second flow value and passing a fourth preset time, S2-4, increasing the three-way gas flow to a third flow value and passing a fifth preset time, and S2-5, reducing the three-way gas flow to a user setting value and turning off the ignition switch when a sixth preset time passes.

According to some embodiments of the invention, the third predetermined time is 4.5-5.5s, the fourth predetermined time is 1.5-2.5s, the fifth predetermined time is 1.5-2.5s, and the sixth predetermined time is 4.5-5.5 s.

According to an embodiment of the present invention, the third predetermined time is 5s, the fourth predetermined time is 5s, the fifth predetermined time is 2s, and the sixth predetermined time is 5 s.

According to some embodiments of the present invention, setting the three gas flows as the first flow value means setting the combustible gas flow as 35-45ml/min, the tail gas flow as 0ml/min, and the combustion supporting gas as 255-; increasing the flow of the three paths of gas to the second flow value means that the flow of the combustible gas is set to be 35-45ml/min, the flow of the tail gas is set to be 5-10ml/min, and the flow of the combustion-supporting gas is set to be 255-265 ml/min; increasing the three paths of gas flow to the third flow value means that the combustible gas flow is set to be 45-55ml/min, the tail gas blowing flow is set to be 15-25ml/min, and the combustion-supporting gas flow is set to be 295-305 ml/min.

According to one embodiment of the invention, setting the three gas flows to the first flow value means setting the combustible gas flow to 40ml/min, the tail gas flow to 0ml/min, and the combustion gas to 260 ml/min; increasing the flow of the three paths of gas to the second flow value means that the flow of the combustible gas is set to be 40ml/min, the flow of the tail gas is set to be 10ml/min, and the flow of the combustion-supporting gas is set to be 260 ml/min; increasing the three paths of gas flow to the third flow value means setting the combustible gas flow to be 50ml/min, the tail gas blowing flow to be 20ml/min and the combustion-supporting gas flow to be 300 ml/min.

In step S2-3, the tail blow flow is increased to trigger the output signal to generate the signal output data.

According to some embodiments of the invention, in the step S1, the ignition ready condition includes that the detector temperature is greater than or equal to the ready temperature and the combustible gas flow rate and the combustion-supporting gas flow rate are greater than or equal to a combustible gas ready flow rate value and a combustion-supporting gas ready flow rate value, respectively.

According to some embodiments of the present invention, the ready temperature is 145-155 ℃, the ready flow value of the combustible gas is 15-25ml/min, and the ready flow value of the combustion-supporting gas is 195-205 ml/min.

According to one embodiment of the invention, the ready temperature is 150 ℃, the ready flow value of the combustible gas is 20ml/min and the ready flow value of the combustion-supporting gas is 200 ml/min.

According to some embodiments of the invention, the three-way gas flow is controlled by an electronic flow control valve.

The gas flow of combustible gas (hydrogen), combustion-supporting gas (air) and tail blowing gas (nitrogen) is controlled by an Electronic Flow Control (EFC) technology, the manual adjustment of three paths of gas flow through an adjusting valve is avoided, the operation is convenient, the time is saved, and the error rate is low.

According to some embodiments of the present invention, in the step S3, it is determined whether ignition is successful by determining whether a predetermined proportion of the signal output data satisfies (i.e., is greater than or equal to) a set ignition lower limit value.

According to one embodiment of the invention, the predetermined proportion is 90%.

Any reference to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention; the schematic representations in various places in the specification do not necessarily refer to the same embodiment; further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.

While specific embodiments of the invention have been described in detail with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention; in particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention; except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.