System for measuring time-averaged value of environmental protection parameter

Abstract

Provided in the present invention is a system for measuring a time-averaged value of an environmental protection parameter. The system comprises: a measurement-time timing module, which is configured to record a measurement time; an abnormal-value screening module, which is configured to acquire input analog quantity values, remove an abnormal analog quantity value and output the analog quantity values, and when an abnormal analog quantity value is detected, control the measurement-time timing module to stop timing; an analog quantity value accumulation module, which is configured to accumulate the analog quantity values output from the abnormal-value screening module; and a time-averaged value output module, which is configured to determine a time-averaged value on the basis of the total value of the analog quantity values accumulated by the analog quantity value accumulation module and the total value of measurement times recorded by an elapsed-time timer, and output the time-averaged value.

Description

Environmental parameter time average measurement system Technical Field

[0001] This invention relates to the field of environmental pollutant measurement technology, and in particular to a time-average measurement system for environmental parameters. Background Technology

[0002] Coal-fired power plants generate electricity using the heat produced by burning coal. The combustion of coal produces large amounts of NO. x Environmental pollutants such as SO2 and particulate matter require denitrification, dust removal, and desulfurization treatment before they can be emitted. As national policies increasingly emphasize environmental protection, thermal power plants have successively completed environmental upgrades to their generating units, strictly controlling the operation and adjustment of environmental parameters related to pollutants. In recent years, the national environmental protection department has assessed pollutant emissions exceeding standards using time-average values. Without direct time-average references or predictions, thermal power plants can only make rough estimates, leading to significant inaccuracies and the risk of exceeding emission standards. Against this backdrop, it is essential to establish a proprietary time-average measurement point logic within the DCS system for thermal power plants, based on the national environmental protection department's time-average assessment calculation method, to predict and prevent the risk of exceeding environmental parameter limits. Summary of the Invention

[0003] This invention provides a time-average measurement system for environmental parameters, which can accurately calculate the time-average values ​​of environmental parameters for thermal power plants.

[0004] This invention provides a time-average measurement system for environmental parameters, comprising:

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

[0006] The outlier filtering module is used to acquire the input analog value, remove abnormal analog values ​​and output the analog value. When an 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 outlier filtering module.

[0008] The time average output module is used to determine and output the time average value based on the total value of the analog values ​​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 filtering module includes:

[0010] The function generator is used to filter the acquired analog values, remove outliers, and then output the analog values.

[0011] a first analog switcher configured to transmit an analog value output by the function generator;

[0012] a quality detector configured to detect whether the analog value acquired by the function generator is abnormal, and send a cutting signal to the first analog switcher when the analog value acquired by the function generator is abnormal, the first analog switcher cutting the analog value after receiving the cutting signal; when the quality detector detects that the analog value acquired by the function generator is an abnormal value, the quality detector also sends a stop timing signal to the measurement time timing module, so that the measurement time timing module stops timing.

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

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

[0015] Optionally, the time average output module comprises a divider.

[0016] Optionally, the environmental protection parameter time average measurement system further comprises:

[0017] a cycle switching module configured to accumulate a cycle time, and send a pulse timing signal to the analog value accumulation module and the measurement time timing module to switch cycles when the switching cycle is met, and reset the analog value accumulated in the analog value accumulation module and the measurement time in the measurement time timing module.

[0018] Optionally, the cycle switching module comprises:

[0019] a timing unit configured to time and output a time signal;

[0020] a high-low limit unit configured to acquire the time signal of the timing unit and output a reset signal;

[0021] a cycle timing unit configured to acquire the reset signal output by the high-low limit unit and output the reset signal when the switching cycle is met;

[0022] a second NOT operator configured to invert the reset signal output by the cycle timing unit to form a pulse timing signal.

[0023] Optionally, the environmental protection parameter time average measurement system further comprises:

[0024] an output locking module configured to lock the output time average when switching cycles.

[0025] When the switching period is met, the period 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 comprises:

[0027] The second analog switcher is arranged between the analog value accumulation module and the time average value output module, and is used to acquire the output of the analog value accumulation module, and the output value of the second analog switcher is locked after receiving the reset signal;

[0028] The third analog switcher 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, and the output value of the third analog switcher is locked after receiving the reset signal.

[0029] Optionally, the environmental protection parameter time average value measurement system further comprises:

[0030] The manual period switching module is used to manually generate the pulse timing signal.

[0031] The technical scheme provided by the present application has the beneficial effects that:

[0032] In the environmental protection parameter time average value measurement system, the abnormal value screening module is arranged, the abnormal analog value is removed through the abnormal value screening module, and then the normal analog value is transported to the analog value accumulation module for accumulation, so that the analog value accumulated by the analog value accumulation module is accurate. When the analog value is detected as an abnormal value, the abnormal value screening module also controls the measurement time counting module to stop timing, so that the measurement time recorded in the measurement time counting module is accurate. Finally, the time average value output module can determine the time average value according to the analog value accumulated by the analog value accumulation module and the measurement time recorded by the measurement time counting module. Moreover, the time average value obtained by using the environmental protection parameter time average value measurement system in the present application has higher accuracy, and the technical problem of inaccurate time average value caused by abnormal analog value input can be further avoided. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0034] Fig. 1 is a schematic diagram of an environmental parameter time average value measurement system according to an embodiment of the present disclosure;

[0035] Fig. 2 is a schematic diagram of a cycle switching module according to an embodiment of the present disclosure.

[0036] Reference signs: 10: measurement time counting module; 20: outlier screening module; 21: function generator; 22: manual input module; 23: first analog switch; 24: quality detector; 25: first NOT operator; 30: analog value accumulation module; 40: time average value output module; 50: cycle switching module; 51: counting unit; 511: minute counter; 512: second counter; 52: high-low limit unit; 521: first high-low limit operator; 522: second high-low limit operator; 53: AND operator; 54: cycle counting unit; 541: first cycle counter; 542: second cycle counter; 55: second NOT operator; 56: third NOT operator; 60: output locking module; 61: second analog switch; 62: third analog switch; 70: manual cycle switching module; 71: remote control memory; 72: third cycle counter; 80: fourth cycle counter. DETAILED DESCRIPTION

[0037] For the purpose of making the object, technical scheme and advantages of the present disclosure clearer, the technical scheme of the present disclosure will be described clearly and completely below with reference to the drawings in the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present disclosure.

[0038] Fig. 1 is a schematic diagram of an environmental parameter time average value measurement system according to an embodiment of the present disclosure. Referring to Fig. 1, the environmental parameter time average value measurement system comprises:

[0039] a measurement time counting module 10 for recording measurement time;

[0040] an outlier screening module 20 for acquiring input analog values, removing abnormal analog values and outputting analog values, and stopping the measurement time counting module from counting when detecting abnormal analog values;

[0041] an analog value accumulation module 30 for accumulating the analog values output by the outlier screening module 20;

[0042] a time average value output module 40 for determining and outputting a time average value according to the total value of the analog values accumulated by the analog value accumulation module 30 and the total value of the measurement time recorded by the measurement time counter.

[0043] In the environmental protection parameter time average value measurement system, the abnormal value screening module is arranged, the abnormal analog value is removed through the abnormal value screening module, then the normal analog value is transported to the analog value accumulation module for accumulation, so that the analog value accumulated by the analog value accumulation module is accurate. When the abnormal value screening module detects that the analog value is an abnormal value, the measurement time counting module is also controlled to stop timing, so that the measurement time recorded in the measurement time counting module is accurate. Finally, the time average value output module can determine the time average value according to the analog value accumulated by the analog value accumulation module and the measurement time recorded by the measurement time counting module. Moreover, the time average value obtained by using the environmental protection parameter time average value measurement system has higher accuracy, and the technical problem of inaccurate time average value caused by abnormal analog value input due to abnormal analog measurement can be further avoided.

[0044] It should be noted that the analog value refers to the concentration of the environmental protection parameter, for example, the concentration of NO x , and the NO x may be NO, NO2 and the like. The analog value is measured by the environmental protection parameter concentration measurement system of the thermal power plant.

[0045] In the present disclosure, the abnormal value screening module 20 comprises:

[0046] A function generator (FX) 21 is configured to screen the obtained analog value, remove the abnormal value in the analog value, and output the analog value.

[0047] A first analog switch (T) 23 is configured to transmit the analog value output by the function generator 21.

[0048] A quality detector (TSTQ) 24 is configured 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, the quality detector 24 sends a cutting signal to the first analog switch 23, and the first analog switch 23 cuts the analog value after receiving the cutting signal. When the quality detector 24 detects that the analog value obtained by the function generator 21 is an abnormal value, the quality detector 24 also sends a stop timing signal to the measurement time counting module 10, so that the measurement time counting module 10 stops timing.

[0049] In the embodiment of the present disclosure, the function generator can approximate the relationship between the input value and the output value, so as to ensure that the output value is more accurate, and to screen out abnormal input values. The quality detector can detect the analog value, control the first analog switcher to deliver the analog value by determining whether the analog value is normal, control the first analog switcher to stop delivering the analog value of the output of the function generator when the analog value is abnormal, and control the measurement time timer to stop timing, so that the abnormal analog value can be removed, and the measurement time of the abnormal analog value can also be removed, so that the final time average value is more accurate.

[0050] In the embodiment of the present disclosure, the abnormal value screening module 20 is also provided with a manual input module (A) 22, which is used to input a manually set analog value into the first analog switcher 23. When the environmental protection parameter concentration measurement system is maintained, the environmental protection parameter concentration measurement system cannot measure the analog value, at which time a manually set analog value is needed as an input, so as to facilitate the environmental protection parameter time average value measurement system to calculate the time average value.

[0051] In the embodiment of the present disclosure, the abnormal value screening module 20 is also provided with a first NOT operator 25, which is used to take the inverse of the output of the quality detector 24 to form a stop timing signal.

[0052] In the embodiment of the present disclosure, the measurement time timing module 10 includes an elapsed time timer (ETIMER), and the elapsed time timer can be used to obtain the measurement time.

[0053] In the embodiment of the present disclosure, the analog value accumulation module 30 includes an integrator (∫), and the integrator can be used to continuously accumulate the analog value delivered by the first analog switcher.

[0054] 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 the time average value.

[0055] In the embodiment of the present disclosure, the environmental protection parameter time average value measurement system further includes:

[0056] The cycle switching module 50 is used to accumulate the cycle time, send a pulse timing signal to the analog value accumulation module 30 and the measurement time timing module 10 to perform cycle switching when the switching cycle is met, and reset the analog value accumulated in the analog value accumulation module 30 and the measurement time in the measurement time timing module 10.

[0057] In the embodiment of the present disclosure, the environmental protection parameter time average measurement system recalculates the time average every switching period, sets a period switching module, and the period switching module automatically sends a signal to switch the period when the switching period is met.

[0058] Fig. 2 is a schematic diagram of a period switching module provided by an embodiment of the present disclosure. Referring to Fig. 2, the period switching module 50 comprises:

[0059] a timing unit 51 for timing and outputting a time signal;

[0060] a high-low limit unit 52 for obtaining the time signal of the timing unit 51 and outputting a reset signal;

[0061] a period timing unit 54 for obtaining the reset signal output by the high-low limit unit 52 and outputting the reset signal when the switching period is met.

[0062] The high-low limit unit 52 and the period timing unit 54 are further provided with an AND operator 53 therebetween.

[0063] a second NOT operator 55 for inverting the reset signal output by the period timing unit 54 to form a pulse timing signal.

[0064] In the embodiment of the present disclosure, the timing unit continuously inputs the time signal, the time signal is converted into a reset signal “0” after passing through the high-low limit unit, then the reset signal enters the period timing unit, the period timing unit times the switching period, releases the reset signal when the switching period is met, and the reset signal “0” is converted into a pulse timing signal “1” after passing through the second NOT operator.

[0065] Referring to Figs. 1 and 2 simultaneously, the pulse timing signal “1” is transmitted to the analog quantity accumulation module 30 after passing through the fourth period timer 80, and is transmitted to the measurement time timing module 10 after passing through the third NOT operator 56, so as to reset the analog quantity accumulation module 30 and the measurement time timing module 10.

[0066] In the embodiment of the present disclosure, the environmental protection parameter time average measurement system further comprises:

[0067] an output locking module 60, which is configured to lock the output time average when the period is switched;

[0068] The period switching module 50 is further configured to generate a reset signal, transmit the reset signal to the output locking module 60 when the switching period is met, and lock the output time average when the output locking module 60 receives the reset signal.

[0069] In the embodiment of the present disclosure, the analog value accumulation module and the measurement time counting module are reset when the period switching is performed, thus, the time average output error is easily caused when the period switching is performed. The output locking module is set, the time average output of the system is locked as the time average output of the previous hour when the period switching is performed, thus, the above problem can be avoided.

[0070] In the embodiment of the present disclosure, the timing unit 51 includes a minute timer 511 and a second timer 512.

[0071] In the embodiment of the present disclosure, the high-low limit unit 52 includes a first high-low limit operator (H / L) 521 and a second high-low limit operator (H / L) 522, the first high-low limit operator 521 and the second high-low limit operator 522 respectively receive the inputs of the minute timer 511 and the second timer 512, and the L ends of the first high-low limit operator 521 and the second high-low limit operator 522 are used as output ends.

[0072] The period timing unit 54 includes a first period timer (TD-DIG) 541 and a second period timer (TD-DIG) 542.

[0073] In the embodiment of the present disclosure, the operator 53 includes two output paths, one output path generates a pulse timing signal after passing through the first period timer 541 and the second inverting operator 55, and the other output path generates a reset signal after passing through the second period timer 542.

[0074] It is worth noting that the pulse timing signal and the reset signal input in FIG. 1 are from the pulse timing signal and the reset signal output in FIG. 2.

[0075] In the embodiment of the present disclosure, the output locking module 60 includes:

[0076] The second analog switch 61 is arranged between the analog value accumulation module 30 and the time average output module 40, and is used to obtain the output of the analog value accumulation module 30. After receiving the reset signal, the second analog switch 61 locks the output value unchanged.

[0077] The third analog switch 62 is arranged after the time average output module, and is used to receive the time average output by the time average output module 40. After receiving the reset signal, the third analog switch 62 locks the output value unchanged.

[0078] 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 output by the time average output module, so that the time average remains unchanged when the cycle switching is performed. The output of the second analog switch is input to the S2 terminal of the second analog switch, and the output of the third analog switch is input to the S2 terminal of the third analog switch. When the reset signal is received, the input to the S2 terminal is used as the output of the second analog switch and the third analog switch, so that the output of the second analog switch and the third analog switch is locked to lock the time average output.

[0079] In the embodiment of the present disclosure, the environmental protection parameter time average measurement system further comprises:

[0080] The manual cycle switching module 70 is configured to manually generate the pulse timing signal.

[0081] In the embodiment of the present disclosure, the manual cycle switching module is arranged in the environmental protection parameter time average measurement system, and the manual cycle switching module can manually release the pulse timing signal to perform cycle switching.

[0082] In the embodiment of the present disclosure, the manual cycle switching module 70 comprises a remote control memory (RCM) 71 and a third cycle timer (TD-DIG) 72, and the third cycle timer 72 can generate the manual pulse timing signal by the remote control memory.

[0083] In the embodiment of the present disclosure, the environmental protection parameter time average measurement system further comprises a fourth cycle timer 80, which is configured to acquire the pulse timing signal and the manual pulse timing signal of the manual cycle switching module, and output when the switching cycle is met.

[0084] It is worth noting that the environmental protection parameter time average measurement system provided by the present disclosure can effectively avoid the environmental protection parameter exceeding the standard, protect the ultra-low emission of environmental pollutants of the thermal power generator unit, and reduce the number of exceeding standards caused by improper adjustment by more than 15% through conservative analysis, thereby effectively protecting the ecological environment. At the same time, it also has a significant effect on improving the environmental protection operation adjustment efficiency, saving the cost of desulfurization, denitrification, dust removal, and controlling the cost of corresponding urea, lime powder, and plant power. According to the actual purchase quantity and purchase price of the commercial material department of a power generation company, compared with the case where the environmental protection parameter time average measurement system provided by the present disclosure is not used, the ammonia usage amount is reduced by more than 6% only from the aspect of denitrification, and the use of raw material urea is conservatively estimated to be saved by more than 170,000 yuan per month.

[0085] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An environmentally friendly parameter time-averaged value measurement system, characterized by, The application relates to an environmental parameter time average value measuring system. The system comprises: a measuring time counting module for recording measuring time; an abnormal value screening module for acquiring input analog values, removing abnormal analog values and outputting the analog values, and stopping the measuring time counting module when abnormal analog values are detected; the abnormal value screening module comprises: a function generator for screening the acquired analog values, removing abnormal values in the analog values and outputting the analog values; a first analog switcher for transmitting the analog values output by the function generator; a quality detector for detecting whether the analog values acquired by the function generator are abnormal, sending a cutting signal to the first analog switcher when the analog values acquired by the function generator are abnormal, and cutting the analog values after the first analog switcher receives the cutting signal; and sending a stop counting signal to the measuring time counting module when the quality detector detects that the analog values acquired by the function generator are abnormal values, so that the measuring time counting module stops counting; the abnormal value screening module further comprises a manual input module for inputting manually set analog values to the first analog switcher when the environmental parameter concentration measuring system is overhauled; an analog value accumulation module for accumulating the analog values output by the abnormal value screening module; a time average value output module for determining and outputting a time average value according to the total value of the analog values accumulated by the analog value accumulation module and the total value of the measuring time recorded by the measuring time counter; the environmental parameter time average value measuring system further comprises: a cycle switching module for accumulating cycle time, sending a pulse counting signal to the analog value accumulation module and the measuring time counting module to switch cycles when the switching cycle is met, and resetting the analog values accumulated in the analog value accumulation module and the measuring time in the measuring time counting module; the cycle switching module comprises: a counting unit for counting and outputting a time signal; a high-low limit unit for acquiring the time signal of the counting unit and outputting a reset signal; a cycle counting unit for acquiring the reset signal output by the high-low limit unit and outputting the reset signal when the switching cycle is met; a second NOT operator for inverting the reset signal output by the cycle counting unit to form a pulse counting signal; two cycle counting units are included in the cycle counting unit, the second NOT operator is arranged behind one of the cycle counting units, and the other cycle counting unit is used for outputting a reset signal when a counting cycle is met; the environmental parameter time average value measuring system further comprises: an output locking module for locking the output time average value when the cycle is switched; when the switching cycle is met, the cycle switching module transmits the reset signal to the output locking module, and the output locking module locks the output time average value when the reset signal is received; the output locking module comprises: A second analog switch is arranged between the analog value accumulation module and the time average output module, and is configured to obtain the output of the analog value accumulation module, and after receiving a reset signal, the second analog switch locks the output value. A third analog switch is arranged after the time average output module, and is configured to receive the time average output by the time average output module, and after receiving a reset signal, the third analog switch locks the output value.

2. The environmentally friendly parameter time-averaged value measuring system according to claim 1, characterized in that, The measurement time counting module comprises an elapsed time counter.

3. The environmentally friendly parameter time-averaged value measuring system according to claim 1, characterized in that, The analog value accumulation module comprises an integrator.

4. The environmentally friendly parameter time-averaged value measuring system according to claim 1, characterized in that, The time average output module comprises a divider.

5. The environmentally parameter time-averaged value measuring system according to any one of claims 1 to 4, characterized in that, The environmental protection parameter time average measurement system further comprises: A manual cycle switching module is configured to manually generate a pulse timing signal.

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