Environmental parameter time-average measurement system

Abstract

The present invention provides a time-average value measurement system for environmental protection parameters. The system comprises: a measurement time timing module for recording measurement time; an abnormal value screening module for obtaining input analog values, removing abnormal analog values ​​and outputting analog values, and controlling the measurement time timing module to stop timing when abnormal analog values ​​are detected; an analog value accumulation module for accumulating analog values ​​output by the abnormal value screening module; and a time-average value output module for determining and outputting a time-average value according to the total value of analog values ​​accumulated by the analog value accumulation module and the total value of measurement time recorded by the elapsed time timer.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental pollutant measurement, and in particular to a time-average value measurement system for environmental parameters. Background Art

[0002] Coal-fired power plants generate electricity through the heat energy generated by burning coal, which produces a large amount of NO x , SO2, and dust and other environmental pollutants. The above environmental pollutants need to be treated with denitrification, dust removal, desulfurization, etc. before they can be discharged. Various thermal power generation companies have successively completed the environmental protection transformation of thermal power generating units, and strictly controlled the operation and adjustment of environmental parameters of environmental pollutants. In recent years, the assessment of pollutant emissions exceeding the standard has been calculated according to the time-average calculation method. Thermal power generation companies can only make rough estimates without direct time-average reference and prediction, which has a large inaccuracy and the risk of exceeding the environmental pollutant emissions. In this context, it is quite necessary to build the thermal power plant's own time-average measurement point logic in the DCS system as a reference according to the time-average assessment calculation method to predict and prevent the risk of exceeding the environmental parameters. Summary of the invention

[0003] The invention provides a time-average value measurement system for environmental protection parameters, which can accurately calculate the time-average value of the environmental protection parameters of a thermal power generation enterprise.

[0004] The present invention provides a time-average value measurement system for environmental protection parameters, comprising:

[0005] The measuring time timing module is used to record the measuring time;

[0006] The abnormal value screening module is used to obtain the input analog value, remove the abnormal analog value and output the analog value. When the abnormal analog value is detected, the measurement time timing module is controlled to stop timing;

[0007] The analog value accumulation module is used to accumulate the analog values ​​output by the abnormal value screening module;

[0008] The time average value output module is used to determine and output the time average value according to the total value of the analog value accumulated by the analog value accumulation module and the total value of the measurement time recorded by the measurement time timer.

[0009] Optionally, the outlier screening module includes:

[0010] A function generator is used to filter the acquired analog values, remove abnormal values ​​in the analog values ​​and then output the analog values;

[0011] A first analog switch, used for transmitting the analog value output by the function generator;

[0012] The quality detector is used to detect whether the analog value obtained by the function generator is abnormal. When the analog value obtained by the function generator is abnormal, the quality detector sends a cut-off signal to the first analog switch. After receiving the cut-off signal, the first analog switch cuts off the analog value. When the quality detector detects that the analog value obtained by the function generator is an abnormal value, the quality detector will also send a stop timing signal to the measurement time timing module to stop timing the measurement time timing module.

[0013] Optionally, the measurement time timing module includes an elapsed time timer.

[0014] Optionally, the analog value accumulation module includes an integrator.

[0015] Optionally, the time-average value output module includes a divider.

[0016] Optionally, the environmental parameter time-average measurement system further includes:

[0017] The cycle switching module is used to accumulate the cycle time. When the switching cycle is met, a pulse timing signal is sent to the analog value accumulation module and the measurement time timing module to perform cycle switching, and the accumulated analog value in the analog value accumulation module and the measurement time in the measurement time timing module are reset to zero.

[0018] Optionally, the periodic switching module includes:

[0019] A timing unit, used for timing and outputting a time signal;

[0020] The high and low limit unit is used to obtain the time signal of the timing unit and output a reset signal;

[0021] The cycle timing unit is used to obtain the reset signal output by the high and low limit units, and output the reset signal when the switching cycle is met;

[0022] The second negation operator is used to negate the reset signal output by the periodic timing unit to form a pulse timing signal.

[0023] Optionally, the environmental parameter time-average measurement system further includes:

[0024] An output locking module, the output locking module is used to lock the time average value of the output when performing cycle switching;

[0025] When the switching cycle is satisfied, the cycle switching module transmits the reset signal to the output locking module, and the output locking module locks the time average value of the output when receiving the reset signal.

[0026] Optionally, the output locking module includes:

[0027] A second analog switch, the second analog switch is arranged between the analog value accumulation module and the time average value output module, the second analog switch is used to obtain the output of the analog value accumulation module, and after receiving the reset signal, the second analog switch locks the output value unchanged;

[0028] The third analog switch is arranged after the time average value output module and is used to receive the time average value output by the time average value output module. After receiving the reset signal, the third analog switch locks the output value unchanged.

[0029] Optionally, the environmental parameter time-average measurement system further includes:

[0030] Manual cycle switching module, used to manually generate pulse timing signals.

[0031] The beneficial effects brought by the technical solution provided by the present invention are:

[0032] In the disclosed embodiment, the environmental parameter time-mean value measurement system is provided with an abnormal value screening module, through which abnormal analog values ​​are removed, and then normal analog values ​​are transmitted to the analog value accumulation module for accumulation, thereby ensuring that the analog values ​​accumulated by the analog value accumulation module are accurate. When the abnormal value screening module detects that the analog value is an abnormal value, it will also control the measurement time timing module to stop timing, thereby ensuring that the measurement time recorded in the measurement time timing module is accurate. Finally, the time-mean value output module can determine the time-mean value based on the analog value accumulated by the analog value accumulation module and the measurement time recorded by the measurement time timing module. In addition, the time-mean value obtained by the environmental parameter time-mean value measurement system of the present invention has a higher accuracy, which can further avoid the technical problem of inaccurate time-mean value caused by abnormal analog value input due to abnormal analog measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic diagram of a time-average value measurement system for environmental protection parameters provided by an embodiment of the present disclosure;

[0035] Figure 2 It is a schematic diagram of a periodic switching module provided in an embodiment of the present disclosure.

[0036] Reference numerals:

[0037] 10: Measuring time timing module.

[0038] 20: abnormal value screening module; 21: function generator; 22: manual input module; 23: first analog switch; 24: quality detector; 25: first negation operator.

[0039] 30: Analog value accumulation module;

[0040] 40: time average output module;

[0041] 50: cycle switching module; 51: timing unit; 511: minute timer; 512: second timer; 52: high and low limit unit; 521: first high and low limit operator; 522: second high and low limit operator; 53: AND operator; 54: cycle timing unit; 541: first cycle timer; 542: second cycle timer; 55: second inversion operator; 56: third inversion operator.

[0042] 60: output locking module; 61: second analog switch; 62: third analog switch.

[0043] 70: manual cycle switching module; 71: remote control memory; 72: third cycle timer.

[0044] 80: Fourth cycle timer. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Figure 1 A schematic diagram of a time-average measurement system for environmental parameters provided by an embodiment of the present disclosure. Figure 1 The environmental parameter time-average measurement system includes:

[0047] The measuring time timing module 10 is used to record the measuring time;

[0048] The abnormal value screening module 20 is used to obtain the input analog value, remove the abnormal analog value and output the analog value, and control the measurement time timing module to stop timing when the analog value is detected to be abnormal;

[0049] The analog value accumulation module 30 is used to accumulate the analog values ​​output by the abnormal value screening module 20;

[0050] The time-average value output module 40 is used to determine and output the time-average value according to the total value of the analog value accumulated by the analog value accumulation module 30 and the total value of the measurement time recorded by the measurement time timer.

[0051] In the disclosed embodiment, the environmental parameter time-mean value measurement system is provided with an abnormal value screening module, through which abnormal analog values ​​are removed, and then normal analog values ​​are transmitted to the analog value accumulation module for accumulation, thereby ensuring that the analog values ​​accumulated by the analog value accumulation module are accurate. When the abnormal value screening module detects that the analog value is an abnormal value, it will also control the measurement time timing module to stop timing, thereby ensuring that the measurement time recorded in the measurement time timing module is accurate. Finally, the time-mean value output module can determine the time-mean value based on the analog value accumulated by the analog value accumulation module and the measurement time recorded by the measurement time timing module. In addition, the time-mean value obtained by the environmental parameter time-mean value measurement system of the present invention has a higher accuracy, which can further avoid the technical problem of inaccurate time-mean value caused by abnormal analog value input due to abnormal analog measurement.

[0052] It is worth noting that the simulated value refers to the concentration of environmental parameters, such as NO x The concentration of NO x It can be NO, NO2 and other gases. The simulation value is measured by the environmental parameter concentration measurement system of the thermal power generation enterprise.

[0053] In the embodiment of the present disclosure, the outlier screening module 20 includes:

[0054] A function generator (FX) 21 is used to filter the acquired analog values, remove abnormal values ​​in the analog values ​​and then output the analog values;

[0055] A first analog switch (T) 23, used for transmitting the analog value output by the function generator 21;

[0056] The quality detector (TSTQ) 24 is used to detect whether the analog value obtained by the function generator 21 is abnormal. When the analog value obtained by the function generator 21 is abnormal, a cut-off signal is sent to the first analog switch 23. After receiving the cut-off signal, the first analog switch 23 cuts off the analog value. When the quality detector 24 detects that the analog value obtained by the function generator 21 is an abnormal value, the quality detector 24 will also send a stop timing signal to the measurement time timing module 10 to stop the measurement time timing module 10.

[0057] In the disclosed embodiment, the function generator can approximate the relationship between the input value and the output value through a function, thereby ensuring that the output value is more accurate, so as to screen out and remove abnormal input values. The quality detector can detect the analog value, and by determining whether the analog value is normal, control the first analog switch whether to transmit the analog value. When the analog value is abnormal, control the first analog switch to stop transmitting the analog value output by the function generator, and control the measurement time timer to stop timing, so that the abnormal analog value can be removed. At the same time, the measurement time of the abnormal analog value can also be removed, so that the time average value finally obtained is more accurate.

[0058] In the disclosed embodiment, a manual input module (A) 22 is further provided in the abnormal value screening module 20, and the manual input module 22 is used to input a manually set analog value into the first analog switch 23. When the environmental parameter concentration measurement system is being overhauled, the environmental parameter concentration measurement system cannot measure the analog value. At this time, an analog value needs to be manually set as an input so that the environmental parameter time-mean value measurement system can perform time-mean value calculation.

[0059] In the embodiment of the present disclosure, a first negation operator (NOT) 25 is further provided in the abnormal value screening module 20. The first negation operator 25 is used to negate the output of the quality detector 24 to form a stop timing signal.

[0060] In the embodiment of the present disclosure, the measurement time timing module 10 includes an elapsed time timer (ETIMER), and the measurement time can be obtained by using the elapsed time timer.

[0061] In the embodiment of the present disclosure, the analog value accumulation module 30 includes an integrator (∫), which can continuously accumulate the analog value transmitted by the first analog switch.

[0062] In the embodiment of the present disclosure, the time average value output module 40 includes a divider (÷). The divider can be used to divide the analog value accumulated by the analog value accumulation module 30 and the measurement time accumulated by the measurement time timing module 10, so as to generate a time average value.

[0063] In the embodiment of the present disclosure, the environmental parameter time-average measurement system further includes:

[0064] The cycle switching module 50 is used to accumulate the cycle time. When the switching cycle is met, a pulse timing signal is sent to the analog value accumulation module 30 and the measurement time timing module 10 to perform cycle switching, and the accumulated analog value in the analog value accumulation module 30 and the measurement time in the measurement time timing module 10 are reset to zero.

[0065] In the disclosed embodiment, the environmental parameter time-mean value measurement system recalculates the time-mean value every time a switching cycle passes, and sets a cycle switching module. The cycle switching module automatically sends a signal to perform cycle switching when the switching cycle is met.

[0066] Figure 2 A schematic diagram of a periodic switching module provided by an embodiment of the present disclosure. Figure 2 , the period switching module 50 comprises:

[0067] A timing unit 51, used for timing and outputting a time signal;

[0068] The high and low limit unit 52 is used to obtain the time signal of the timing unit 51 and output a reset signal;

[0069] The cycle timing unit 54 is used to obtain the reset signal output by the high and low limit unit 52, and output the reset signal when the switching cycle is met.

[0070] An AND operator (AND) 53 is further provided between the upper and lower limit unit 52 and the period timing unit 54 .

[0071] The second negation operator 55 is used to negate the reset signal output by the period timing unit 54 to form a pulse timing signal.

[0072] In the embodiment of the present disclosure, the time signal is continuously input through the timing unit, and after passing through the high and low limit units, the time signal is converted into a reset signal "0", and then the reset signal enters the periodic timing unit. The periodic timing unit will time the switching period, and when the switching period is met, the reset signal is released. After the reset signal passes through the second inversion operator, the reset signal "0" is converted into a pulse timing signal "1".

[0073] See also Figure 1 and Figure 2 The pulse timing signal "1" is transmitted to the analog quantity accumulation module 30 after passing through the fourth cycle timer 80, and is transmitted to the measurement time timing module 10 after passing through the third inversion operator 56, so that the analog quantity accumulation module 30 and the measurement time timing module 10 are reset to zero.

[0074] In the embodiment of the present disclosure, the environmental parameter time-average measurement system further includes:

[0075] An output locking module 60, the output locking module 60 is used to lock the time average value of the output when performing cycle switching;

[0076] The cycle switching module 50 is further used to generate a reset signal, and when the switching cycle is satisfied, transmit the reset signal to the output locking module 60. When receiving the reset signal, the output locking module 60 locks the time average value of the output.

[0077] In the embodiment of the present disclosure, the analog value accumulation module and the measurement time timing module will be reset to zero when the cycle is switched. Therefore, it is easy to cause errors in the time average value output when the cycle is switched. By setting an output locking module to lock the system's time average value output to the time average value output of the previous hour when the cycle is switched, the above problem can be avoided.

[0078] In the embodiment of the present disclosure, the timing unit 51 includes a minute timer 511 and a second timer 512 .

[0079] In the embodiment of the present disclosure, the high and low limit unit 52 includes a first high and low limit operator (H / L) 521 and a second high and low limit operator (H / L) 522. The first high and low limit operator 521 and the second high and low limit operator 522 receive inputs from a minute timer 511 and a second timer 512 respectively, and the L ends of the first high and low limit operator 521 and the second high and low limit operator 522 serve as output ends.

[0080] The cycle timing unit 54 includes a first cycle timer (TD-DIG) 541 and a second cycle timer (TD-DIG) 542 .

[0081] In the disclosed embodiment, the AND operator 53 includes two outputs, one output generates a pulse timing signal after passing through the first cycle timer 541 and the second negation operator 55, and the other output generates a reset signal after passing through the second cycle timer 542.

[0082] It is worth mentioning that Figure 1 The input pulse timing signal and reset signal come from Figure 2 The pulse timing signal and reset signal output in the.

[0083] In the embodiment of the present disclosure, the output locking module 60 includes:

[0084] A second analog switch 61, which is disposed between the analog value accumulation module 30 and the time-average value output module 40. The second analog switch 61 is used to obtain the output of the analog value accumulation module 30. After receiving a reset signal, the second analog switch 61 locks the output value unchanged;

[0085] The third analog switch 62 is arranged after the time average value output module, and is used to receive the time average value output by the time average value output module 40. After receiving the reset signal, the third analog switch 62 locks the output value unchanged.

[0086] In the embodiment of the present disclosure, the second analog switch can lock the output value of the integrator, and the third analog switch can lock the time average value output by the time average value output module. The time average value can be kept unchanged during periodic switching through the second analog switch and the third analog switch. Among them, the output of the second analog switch is used as the input of the S2 end of the second analog switch, and the output of the third analog switch is used as the input of the S2 end of the third analog switch. When a reset signal is received, the second analog switch and the third analog switch use the input of the S2 end as the output, which can lock the output of the second analog switch and the third analog switch to lock the time average value output.

[0087] In the embodiment of the present disclosure, the environmental parameter time-average measurement system further includes:

[0088] The manual cycle switching module 70 is used to manually generate a pulse timing signal.

[0089] In the embodiment of the present disclosure, a manual cycle switching module is provided in the environmental parameter time-average measurement system, and the manual cycle switching module can manually release a pulse timing signal to perform cycle switching.

[0090] In the disclosed embodiment, the manual cycle switching module 70 includes a remote control memory (RCM) 71 and a third cycle timer (TD-DIG) 72. The third cycle timer 72 can be controlled by the remote control memory to generate a manual pulse timing signal.

[0091] In the disclosed embodiment, a fourth cycle timer 80 is also provided in the environmental parameter time-average measurement system. The fourth cycle timer 80 is used to obtain the pulse timing signal and the manual pulse timing signal of the manual cycle switching module, and output it when the switching cycle is met.

[0092] It is worth noting that the environmental parameter time-mean measurement system provided by the present invention can effectively avoid exceeding the environmental parameter standard, ensure the ultra-low emission of environmental pollutants of thermal power generating units, and conservative analysis can reduce the number of exceeding the standard caused by improper adjustment by more than 15%, effectively protecting the ecological environment. At the same time, it also plays a significant role in improving the efficiency of environmental protection operation regulation, saving the costs of desulfurization, denitrification, dust removal, etc., and controlling the corresponding costs of urea, lime powder, factory electricity, etc. The actual purchase volume and purchase price of the business materials department of a certain power generation company are compared with the calculation when the environmental parameter time-mean measurement system provided by the present invention is not adopted. From the aspect of denitrification alone, the amount of ammonia used is reduced by more than 6%, and the use of the corresponding raw material urea is conservatively estimated to save more than 170,000 yuan per month.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A time-average measurement system for environmental parameters, characterized in that: include: The measuring time timing module is used to record the measuring time; The abnormal value screening module is used to obtain the input analog value, remove the abnormal analog value and output the analog value. When the abnormal analog value is detected, the measurement time timing module is controlled to stop timing; The outlier screening module comprises: A function generator is used to filter the acquired analog values, remove abnormal values ​​in the analog values ​​and then output the analog values; A first analog switch, used for transmitting the analog value output by the function generator; The quality detector is used to detect whether the analog value obtained by the function generator is abnormal. When the analog value obtained by the function generator is abnormal, the quality detector sends a cut-off signal to the first analog switch. After receiving the cut-off signal, the first analog switch cuts off the analog value. When the quality detector detects that the analog value obtained by the function generator is an abnormal value, the quality detector also sends a stop timing signal to the measurement time timing module to stop timing the measurement time timing module. The abnormal value screening module also includes a manual input module, which is used to input manually set analog values ​​to the first analog switch when the environmental parameter concentration measurement system is overhauled; The analog value accumulation module is used to accumulate the analog values ​​output by the abnormal value screening module; The time average value output module is used to determine and output the time average value according to the total value of the analog value accumulated by the analog value accumulation module and the total value of the measurement time recorded by the measurement time timer; The environmental parameter time-average measurement system also includes: The cycle switching module is used to accumulate the cycle time, and when the switching cycle is met, sends a pulse timing signal to the analog value accumulation module and the measurement time timing module to perform cycle switching, and resets the analog value accumulated in the analog value accumulation module and the measurement time in the measurement time timing module to zero; The cycle switching module comprises: A timing unit, used for timing and outputting a time signal; The high and low limit unit is used to obtain the time signal of the timing unit and output a reset signal; The cycle timing unit is used to obtain the reset signal output by the high and low limit units, and output the reset signal when the switching cycle is met; A second negation operator, used for negating the reset signal output by the periodic timing unit to form a pulse timing signal; The cycle timing unit includes two cycle timing units, the second negation operator is arranged behind one of the cycle timing units, and the other cycle timing unit is used to output a reset signal when the timing cycle is met; The environmental parameter time-average measurement system also includes: An output locking module, the output locking module is used to lock the time average value of the output when performing cycle switching; When the switching cycle is satisfied, the cycle switching module transmits the reset signal to the output locking module, and the output locking module locks the time average value of the output when receiving the reset signal; The output locking module comprises: A second analog switch, the second analog switch is arranged between the analog value accumulation module and the time average value output module, the second analog switch is used to obtain the output of the analog value accumulation module, and after receiving the reset signal, the second analog switch locks the output value unchanged; The third analog switch is arranged after the time average value output module and is used to receive the time average value output by the time average value output module. After receiving the reset signal, the third analog switch locks the output value unchanged.

2. The environmental parameter time-average measurement system according to claim 1, characterized in that: The measured time timing module includes an elapsed time timer.

3. The environmental parameter time-average measurement system according to claim 1, characterized in that: The analog value accumulation module includes an integrator.

4. The environmental parameter time-average measurement system according to claim 1, characterized in that: The time-average value output module includes a divider.

5. The environmental parameter time-average measurement system according to any one of claims 1 to 4, characterized in that: The environmental parameter time-average measurement system also includes: Manual cycle switching module, used to manually generate pulse timing signals.

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