Method for improving pulverized coal fuel rate at lower air temperature

Abstract

The invention relates to the technical field of clean and efficient combustion of pulverized coal, and particularly discloses a method for improving the fuel rate of the pulverized coal at a relatively low air temperature, which comprises the following steps: acquiring quality data of the pulverized coal before and after drying and screening data of the pulverized coal after drying, processing and analyzing the quality data and the screening data to obtain a drying performance value MFB, whether pulverized coal drying is qualified or not is judged according to the drying performance value MFB, then in the monitoring period, primary air state parameters are obtained and analyzed to obtain a primary air state value ZT, and whether primary air meets the pulverized coal conveying requirement or not is judged based on the obtained primary air state value ZT; and finally, the primary air tuyere area and the primary air state value are analyzed to obtain a primary air state curve, a primary air performance value BX is obtained based on the obtained primary air state curve, and whether the primary air tuyere area influences the primary air state value or not is judged based on the obtained primary air performance value BX.

Description

Technical Field

[0001] The invention relates to the technical field of clean and efficient combustion of pulverized coal, and in particular to a method for improving the fuel rate of pulverized coal under relatively low wind temperature. Background Art

[0002] Improving the pulverized coal fuel rate is the key to reducing pollutant emissions. Under low wind temperature conditions, traditional coal-fired technology performs poorly in low wind temperature environments, resulting in increased fuel consumption and reduced combustion efficiency. Searching and citing advanced science and technology to overcome this obstacle is of great significance for ensuring stable energy supply, reducing operating costs and meeting environmental protection requirements.

[0003] A Chinese patent application with publication number CN108278595A discloses a method and system for deep graded combustion of pulverized coal. The system includes a pre-combustion device, a medium-temperature combustion device and a separator connected in sequence. The pulverized coal is partially gasified in the pre-combustion device to produce synthesis gas, and enters the medium-temperature combustion device together with unburned fuel for medium-temperature suspension combustion under graded air distribution conditions. The combustion products are separated into gas and solid by a separator, and the separated solid particles are returned to the medium-temperature combustion device to participate in material circulation and cyclic combustion. The present invention partially gasifies the pulverized coal by the pre-combustion device to obtain gasified synthesis gas, and then burns it in the medium-temperature combustion device, so that the three types of particles, fine, medium and coarse, are gasified, the residence time of the pulverized coal particles in the whole system is increased, which is conducive to the ignition of the pulverized coal and the conversion rate of the pulverized coal is increased, and the coal burning method is changed to the method of burning pulverized coal and synthesis gas, which improves the distribution of the flow field and temperature field inside the furnace, so that the combustion is more thorough and the burnout rate is higher.

[0004] In the above-mentioned prior art, the combustion efficiency of pulverized coal is improved by burning pulverized coal in stages, but the state of pulverized coal after drying is not analyzed during the entire pulverized coal combustion process, so it is impossible to judge whether the pulverized coal is qualified, resulting in a waste of resources. In addition, the primary air is not analyzed, which greatly reduces the efficiency of transporting pulverized coal to the furnace.

[0005] To this end, the present invention provides a method for increasing the pulverized coal fuel rate at a relatively low wind temperature. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a method for increasing the fuel rate of pulverized coal at a relatively low wind temperature, comprising:

[0008] Step 1: Obtain the quality data of the coal powder before and after drying and the screening data of the coal powder after drying, wherein the quality data includes the quality of the coal powder before and after drying, and the screening data includes the quality of the coal powder after drying after screening, process and analyze the quality data and the screening data to obtain a drying performance value MFB, judge whether the coal powder is dried to be qualified according to the drying performance value MFB, and generate a performance signal, which is divided into a drying qualified signal and a drying unqualified signal;

[0009] Step 2: Based on the qualified signal of pulverized coal drying, obtain the primary air state parameters within the monitoring period, wherein the primary air state parameters include the primary air temperature deviation absolute value ratio QL and the primary air speed stability value WD, analyze the primary air state parameters to obtain the primary air state value ZT, judge whether the primary air meets the requirements for conveying pulverized coal based on the obtained primary air state value ZT, and generate an analysis signal, which is divided into a signal that meets the requirements and a signal that does not meet the requirements;

[0010] Step three: Based on the generated signal that the requirements are not met, the primary wind status curve is obtained by analyzing the primary wind outlet area and the primary wind status value, and the primary wind performance value BX is obtained based on the obtained primary wind status curve. Based on the obtained primary wind performance value BX, it is determined whether the primary wind outlet area has an impact on the primary wind status value, and a processing signal is generated. The processing signal is divided into an adjustment signal and a maintenance signal.

[0011] As a further solution of the present invention: the drying performance value MFB is obtained in the following manner:

[0012] The obtained coal powder moisture evaporation rate SL and the coal powder screening rate SZ after drying are processed by data, and the formula is: The performance value MFB of the dried coal powder is obtained, where a1 and a2 are both preset proportional coefficients.

[0013] As a further solution of the present invention: the coal powder water evaporation rate SL is obtained in the following manner:

[0014] The masses of the coal powder before and after drying are obtained by an electronic weighing instrument, and the difference is processed to obtain the coal powder mass difference. The obtained coal powder mass difference is processed as a ratio with the coal powder mass before drying to obtain the coal powder water evaporation rate SL.

[0015] As a further solution of the present invention: the method for obtaining the coal powder screening rate SZ after drying is:

[0016] The dried coal powder obtained in the above operation is put into a screening machine for screening to obtain the screened dried coal powder, and its mass is obtained by an electronic weighing instrument, which is marked as the screened mass. The screened mass is ratioed to the dried coal powder mass to obtain the dried coal powder screening rate SZ.

[0017] As a further solution of the present invention: the primary wind state value ZT is obtained in the following manner:

[0018] The obtained primary wind speed stability value WD and the primary wind temperature deviation absolute value ratio QL are processed by the formula: A wind state value ZT is obtained, where n1 and n2 are both preset proportional coefficients.

[0019] As a further solution of the present invention: the primary wind speed stability value WD is obtained in the following manner:

[0020] The obtained coincidence time SH and non-coincidence time FH are processed by the formula: The primary wind speed stability value WD is obtained, where b1 and b2 are both preset proportional coefficients.

[0021] As a further solution of the present invention: the overlap time SH and the non-overlap time FH are obtained in the following manner:

[0022] Obtain a wind speed parameter value and mark it as the wind speed parameter value, establish a rectangular coordinate system with time as the X-axis and the wind speed parameter value as the Y-axis, mark the wind speed parameter value in the rectangular coordinate system, obtain a wind speed parameter change curve, count all wind speed parameter values, sum them up and then perform mean processing to obtain the wind speed parameter mean;

[0023] With the mean wind speed parameter as the reference point, mark a reference line on the Y axis parallel to the X axis, mark it as the mean wind speed reference line, calculate the duration of the overlapping part of the wind speed parameter change curve and the mean wind speed reference line on the X axis, mark it as the overlapping time SH, calculate the duration of the non-overlapping part of the wind speed parameter change curve and the mean wind speed reference line on the X axis, mark it as the non-overlapping time FH.

[0024] As a further solution of the present invention: the primary air temperature deviation absolute value ratio QL is obtained in the following manner:

[0025] The primary air temperature value is obtained in real time through the temperature detector. The obtained primary air temperature values ​​are first summed and then averaged to obtain the primary air temperature mean. The obtained primary air temperature mean is first subtracted from the preset primary air temperature threshold and then processed as an absolute value to obtain the absolute value of the primary air temperature deviation. The absolute value of the primary air temperature deviation is ratioed with the primary air temperature threshold to obtain the absolute value ratio QL of the primary air temperature deviation.

[0026] As a further solution of the present invention: the primary wind performance value BX is obtained in the following manner:

[0027] The obtained percentage of the number of ascending sub-segments SZ and the percentage of the mean difference of the slope of the ascending sub-segments JZ are processed by the formula: Get the primary wind performance value BX.

[0028] As a further solution of the present invention: the ascending sub-segment quantity proportion SZ is obtained in the following manner:

[0029] Divide the primary wind state change curve into several sub-segments, mark them as primary wind state change sub-segments, obtain the endpoints of the primary wind state change sub-segment and connect them with a straight line to obtain the primary wind state change sub-segment connecting line, number all the endpoints of the primary wind state change sub-segment connecting line as i, i=1, 2, 3...n, obtain the primary wind state value corresponding to one of the i+1 endpoints of the primary wind state change sub-segment connecting line on the Y axis, perform difference processing on it and the primary wind state value corresponding to the other adjacent endpoint i on the Y axis to obtain the primary wind state difference, if the primary wind state difference is greater than 0, mark the primary wind state change sub-segment as an ascending sub-segment, count the number of ascending sub-segments, perform ratio processing on it and the number of all primary wind state change sub-segments to obtain the ascending sub-segment number ratio SZ;

[0030] The method for obtaining the mean value JZ of the slope difference of the ascending sub-segment is as follows:

[0031] Based on the rising sub-segments obtained above, the slopes of all the rising sub-segments are obtained, and they are summed up and then averaged to obtain the mean slope of the rising sub-segments. The obtained mean slope of the rising sub-segments is first subtracted from the slope of the rising sub-segments and then processed by absolute value to obtain the slope difference of the rising sub-segments. The slope differences of all the rising sub-segments are counted and summed up and then averaged to obtain the mean of the slope differences of the rising sub-segments. The obtained mean of the slope differences of the rising sub-segments is ratioed with the mean slope of the rising sub-segments to obtain the mean proportion of the slope differences of the rising sub-segments JZ.

[0032] Beneficial effects of the present invention:

[0033] 1. Obtain the quality data of coal powder before and after drying, as well as the screening data of coal powder after drying, process and analyze the quality data and screening data to obtain the drying performance value MFB, judge whether the coal powder drying is qualified according to the drying performance value MFB, and generate a performance signal. The performance signal is divided into a qualified drying signal and an unqualified drying signal. Through the quality data and the screening data of coal powder after drying, the performance of the coal powder drying process can be effectively analyzed and its qualification can be judged.

[0034] 2. During the monitoring period, the primary air state parameters are obtained and analyzed to obtain the primary air state value ZT. Based on the obtained primary air state value ZT, it is judged whether the primary air meets the requirements for conveying pulverized coal. This has a significant effect on ensuring the effective conveying of pulverized coal, ensuring the stable operation of the boiler, optimizing the operation strategy, and improving safety. It also helps to improve energy utilization and operation efficiency, and reduce operation costs and safety risks. Then, the primary air inlet area and the primary air state value are analyzed to obtain the primary air state curve. Based on the obtained primary air state curve, the performance value BX of the primary air is obtained. Based on the obtained primary air performance value BX, it is judged whether the primary air inlet area has an impact on the primary air state value. By analyzing the primary air state curve and the performance value BX, potential problems that may exist in the primary air system can be discovered in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Figure 1 This is a flow chart of the steps of a method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to the present invention;

[0037] Figure 2 It is a flow chart of the steps for obtaining a method for increasing the pulverized coal fuel rate at a relatively low wind temperature as described in an alternative embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] Example 1

[0040] like Figure 1-2 As shown, a method for improving pulverized coal fuel rate at a relatively low wind temperature according to an embodiment of the present invention comprises:

[0041] Step 1: Obtain the quality data of the coal powder before and after drying and the screening data of the coal powder after drying, wherein the quality data includes the quality of the coal powder before and after drying, and the screening data includes the quality of the coal powder after drying after screening, process and analyze the quality data and the screening data to obtain a drying performance value MFB, judge whether the coal powder is dried to be qualified according to the drying performance value MFB, and generate a performance signal, which is divided into a drying qualified signal and a drying unqualified signal;

[0042] The mass of the coal powder before and after drying is obtained by an electronic weighing instrument, and the difference is processed to obtain the coal powder mass difference. The obtained coal powder mass difference is processed with the coal powder mass before drying to obtain the coal powder water evaporation rate SL;

[0043] The dried coal powder obtained in the above operation is put into a screening machine for screening to obtain the screened dried coal powder, and its mass is obtained by an electronic weighing instrument, which is marked as the screened mass, and the screened mass is compared with the dried coal powder mass to obtain the dried coal powder screening rate SZ;

[0044] The obtained coal powder moisture evaporation rate SL and the coal powder screening rate SZ after drying are processed by data, and the formula is: The performance value MFB of the dried coal powder is obtained, where a1 and a2 are both preset proportional coefficients;

[0045] Preset the performance threshold MFY of the pulverized coal after drying;

[0046] If the performance value of the dried coal powder MFB ≥ the performance threshold value of the dried coal powder MFY, a qualified signal of the dried coal powder is generated, and the dried coal powder needs to proceed to the next step;

[0047] If the performance value of the dried coal powder MFB is less than the performance threshold value of the dried coal powder MFY, a signal indicating that the coal powder is not dried properly is generated. In this case, the coal powder needs to be dried again and the performance value of the dried coal powder needs to be re-evaluated.

[0048] The technical solution of the embodiment of the present invention is as follows: quality data of coal powder before and after drying and screening data of coal powder after drying are obtained, the quality data and screening data are processed and analyzed to obtain a drying performance value MFB, whether the coal powder drying is qualified is judged according to the drying performance value MFB, and a performance signal is generated. The performance signal is divided into a drying qualified signal and a drying unqualified signal. Through the quality data and the screening data of coal powder after drying, the performance of the coal powder drying process can be effectively analyzed and its qualification can be judged.

[0049] Example 2

[0050] like Figure 1-2 As shown, a method for improving pulverized coal fuel rate at a relatively low wind temperature according to an embodiment of the present invention comprises:

[0051] Step 2: Based on the qualified signal of pulverized coal drying, obtain the primary air state parameters within the monitoring period, wherein the primary air state parameters include the primary air temperature deviation absolute value ratio QL and the primary air speed stability value WD, analyze the primary air state parameters to obtain the primary air state value ZT, judge whether the primary air meets the requirements for conveying pulverized coal based on the obtained primary air state value ZT, and generate an analysis signal, which is divided into a signal that meets the requirements and a signal that does not meet the requirements;

[0052] It should be noted that: primary air refers to: primary air is used to transport and heat pulverized coal, so that it is sent into the furnace through the primary air duct, and it is mainly provided by the primary fan;

[0053] The primary air temperature value is obtained in real time through the temperature detector. The primary air temperature values ​​obtained are summed up and then averaged to obtain the primary air temperature average. The primary air temperature average is first subtracted from the preset primary air temperature threshold and then processed as an absolute value to obtain the primary air temperature deviation absolute value. The primary air temperature deviation absolute value is processed as a ratio of the primary air temperature threshold to obtain the primary air temperature deviation absolute value ratio QL;

[0054] Obtain a wind speed parameter value and mark it as the wind speed parameter value, establish a rectangular coordinate system with time as the X-axis and the wind speed parameter value as the Y-axis, mark the wind speed parameter value in the rectangular coordinate system, obtain a wind speed parameter change curve, count all wind speed parameter values, sum them up and then perform mean processing to obtain the wind speed parameter mean;

[0055] Using the wind speed parameter mean as the reference point, mark a reference line on the Y axis parallel to the X axis, mark it as the wind speed mean reference line, calculate the duration of the overlapped portion of the wind speed parameter change curve and the wind speed mean reference line on the X axis, mark it as the overlap time SH, calculate the duration of the non-overlapped portion of the wind speed parameter change curve and the wind speed mean reference line on the X axis, mark it as the non-overlap time FH;

[0056] The obtained coincidence time SH and non-coincidence time FH are processed by the formula: The primary wind speed stability value WD is obtained, where b1 and b2 are both preset proportional coefficients;

[0057] It should be noted that: the meaning of the primary wind speed stability value WD is: the primary wind speed stability value WD is obtained by calculating the overlap time SH and the non-overlap time FH, wherein the overlap time SH reflects the overlap degree between the wind speed parameter change curve and the wind speed parameter mean reference line. The larger the overlap time SH, the more stable the wind speed parameter change curve is, while the non-overlap time FH reflects the amount of non-overlapping part between the wind speed parameter change curve and the wind speed parameter mean reference line. The smaller the non-overlap time FH, the more stable the wind speed parameter change curve is.

[0058] The obtained primary wind speed stability value WD and the primary wind temperature deviation absolute value ratio QL are processed by the formula: Get the primary wind state value ZT, where n1 and n2 are both preset proportional coefficients;

[0059] Preset primary wind state threshold ZTY;

[0060] If the primary air state value ZT is greater than or equal to the primary air state threshold ZTY, a required signal is generated, and the primary air transports the pulverized coal into the furnace;

[0061] If the primary wind state value ZT is less than the primary wind state threshold ZTY, a signal indicating that the requirement is not met is generated, and further analysis of the primary wind is required;

[0062] Step 3: Based on the generated signal that the requirement is not met, a primary wind state curve is obtained by analyzing the primary wind outlet area and the primary wind state value, and a primary wind performance value BX is obtained based on the obtained primary wind state curve. Based on the obtained primary wind performance value BX, it is determined whether the primary wind outlet area has an impact on the primary wind state value, and a processing signal is generated. The processing signal is divided into an adjustment signal and a maintenance signal;

[0063] It should be noted that the primary air outlet area refers to the cross-sectional area of ​​the primary air nozzle in the pulverized coal burner.

[0064] Through the historical data, the primary air outlet area and the primary air state value ZT corresponding to the primary air outlet area are obtained, and then a rectangular coordinate system is established with the primary air outlet area as the X-axis and the primary air state value ZT as the Y-axis. The primary air state value ZT corresponding to the primary air outlet area is marked in the rectangular coordinate system to obtain the primary air state change curve;

[0065] Divide the primary wind state change curve into several sub-segments, mark them as primary wind state change sub-segments, obtain the endpoints of the primary wind state change sub-segment and connect them with a straight line to obtain the primary wind state change sub-segment connecting line, number all the endpoints of the primary wind state change sub-segment connecting line as i (where i=1, 2, 3...n), obtain the primary wind state value corresponding to one of the i+1 endpoints of the primary wind state change sub-segment connecting line on the Y axis, perform difference processing on it and the primary wind state value corresponding to the other adjacent endpoint i on the Y axis to obtain the primary wind state difference, if the primary wind state difference is greater than 0, mark the primary wind state change sub-segment as an ascending sub-segment, count the number of ascending sub-segments, perform ratio processing on it with the number of all primary wind state change sub-segments, and obtain the ascending sub-segment number ratio SZ;

[0066] Based on the rising sub-segments obtained above, the slopes of all the rising sub-segments are obtained, and they are summed up and then averaged to obtain the average slope of the rising sub-segments. The obtained average slope of the rising sub-segments is first subtracted from the slope of the rising sub-segments and then processed by absolute value to obtain the slope difference of the rising sub-segments. The slope differences of all the rising sub-segments are counted and summed up and then averaged to obtain the average of the slope differences of the rising sub-segments. The obtained average of the slope differences of the rising sub-segments is ratioed with the average slope of the rising sub-segments to obtain the average proportion of the slope differences of the rising sub-segments JZ;

[0067] The obtained percentage of the number of ascending sub-segments SZ and the percentage of the mean difference of the slope of the ascending sub-segments JZ are processed by the formula: Get the primary wind performance value BX;

[0068] Preset a wind performance threshold BXY;

[0069] If the primary wind performance value BX is greater than or equal to the primary wind performance threshold value BXY, an adjustment signal is generated. At this time, the primary wind outlet area needs to be adjusted to adjust the primary wind state value;

[0070] If the primary air performance value BX is less than the primary air performance threshold value BXY, a maintenance signal is generated, and the pulverized coal combustion equipment needs to be repaired;

[0071] The technical solution of the embodiment of the present invention is as follows: within the monitoring period, the primary air state parameters are obtained and analyzed to obtain the primary air state value ZT. Based on the obtained primary air state value ZT, it is judged whether the primary air meets the requirements for conveying coal powder, which has a significant effect on ensuring the effective conveying of coal powder, ensuring the stable operation of the boiler, optimizing the operation strategy and improving safety. It also helps to improve energy utilization and operation efficiency, and reduce operation costs and safety risks. Then, the primary air inlet area and the primary air state value are analyzed to obtain the primary air state curve, and the primary air performance value BX is obtained based on the obtained primary air state curve. Based on the obtained primary air performance value BX, it is judged whether the primary air inlet area has an impact on the primary air state value. By analyzing the primary air state curve and the performance value BX, potential problems that may exist in the primary air system can be discovered in advance.

[0072] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for increasing the fuel efficiency of pulverized coal at a relatively low wind temperature, characterized in that: include: Step 1: Obtain the quality data of the coal powder before and after drying and the screening data of the coal powder after drying, wherein the quality data includes the quality of the coal powder before and after drying, and the screening data includes the quality of the coal powder after drying after screening, process and analyze the quality data and the screening data to obtain a drying performance value MFB, judge whether the coal powder is dried to be qualified according to the drying performance value MFB, and generate a performance signal, which is divided into a drying qualified signal and a drying unqualified signal; Step 2: Based on the qualified signal of pulverized coal drying, obtain the primary air state parameters within the monitoring period, wherein the primary air state parameters include the primary air temperature deviation absolute value ratio QL and the primary air speed stability value WD, analyze the primary air state parameters to obtain the primary air state value ZT, judge whether the primary air meets the requirements for conveying pulverized coal based on the obtained primary air state value ZT, and generate an analysis signal, which is divided into a signal that meets the requirements and a signal that does not meet the requirements; Step three: Based on the generated signal that the requirements are not met, the primary wind status curve is obtained by analyzing the primary wind outlet area and the primary wind status value, and the primary wind performance value BX is obtained based on the obtained primary wind status curve. Based on the obtained primary wind performance value BX, it is determined whether the primary wind outlet area has an impact on the primary wind status value, and a processing signal is generated. The processing signal is divided into an adjustment signal and a maintenance signal.

2. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 1, characterized in that: The drying performance value MFB is obtained as follows: The obtained coal powder moisture evaporation rate SL and the coal powder screening rate SZ after drying are processed by data, and the formula is: The performance value MFB of the dried coal powder is obtained, where a1 and a2 are both preset proportional coefficients.

3. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 2, characterized in that: The coal powder water evaporation rate SL is obtained as follows: The masses of the coal powder before and after drying are obtained by an electronic weighing instrument, and the difference is processed to obtain the coal powder mass difference. The obtained coal powder mass difference is processed as a ratio with the coal powder mass before drying to obtain the coal powder water evaporation rate SL.

4. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 2, characterized in that: The method for obtaining the coal powder screening rate SZ after drying is: The dried coal powder obtained in the above operation is put into a screening machine for screening to obtain the screened dried coal powder, and its mass is obtained by an electronic weighing instrument, which is marked as the screened mass. The screened mass is ratioed to the dried coal powder mass to obtain the dried coal powder screening rate SZ.

5. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 1, characterized in that: The primary wind state value ZT is obtained in the following manner: The obtained primary wind speed stability value WD and the primary wind temperature deviation absolute value ratio QL are processed by the formula: A wind state value ZT is obtained, where n1 and n2 are both preset proportional coefficients.

6. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 5, characterized in that: The primary wind speed stability value WD is obtained in the following manner: The obtained coincidence time SH and non-coincidence time FH are processed by the formula: The primary wind speed stability value WD is obtained, where b1 and b2 are both preset proportional coefficients.

7. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 6, characterized in that: The overlap time SH and the non-overlap time FH are obtained as follows: Obtain a wind speed parameter value and mark it as the wind speed parameter value, establish a rectangular coordinate system with time as the X-axis and the wind speed parameter value as the Y-axis, mark the wind speed parameter value in the rectangular coordinate system, obtain a wind speed parameter change curve, count all wind speed parameter values, sum them up and then perform mean processing to obtain the wind speed parameter mean; With the mean wind speed parameter as the reference point, mark a reference line on the Y axis parallel to the X axis, mark it as the mean wind speed reference line, calculate the duration of the overlapping part of the wind speed parameter change curve and the mean wind speed reference line on the X axis, mark it as the overlapping time SH, calculate the duration of the non-overlapping part of the wind speed parameter change curve and the mean wind speed reference line on the X axis, mark it as the non-overlapping time FH.

8. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 5, characterized in that: The method for obtaining the absolute value ratio QL of the primary air temperature deviation is as follows: The primary air temperature value is obtained in real time through the temperature detector. The obtained primary air temperature values ​​are first summed and then averaged to obtain the primary air temperature mean. The obtained primary air temperature mean is first subtracted from the preset primary air temperature threshold and then processed as an absolute value to obtain the absolute value of the primary air temperature deviation. The absolute value of the primary air temperature deviation is ratioed with the primary air temperature threshold to obtain the absolute value ratio QL of the primary air temperature deviation.

9. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 1, characterized in that: The primary wind performance value BX is obtained in the following way: The obtained percentage of the number of ascending sub-segments SZ and the percentage of the mean difference of the slope of the ascending sub-segments JZ are processed by the formula: Get the primary wind performance value BX.

10. The method for increasing the pulverized coal fuel rate at a relatively low wind temperature according to claim 9, characterized in that: The method for obtaining the proportion SZ of the number of ascending sub-segments is as follows: Divide the primary wind state change curve into several sub-segments, mark them as primary wind state change sub-segments, obtain the endpoints of the primary wind state change sub-segment and connect them with a straight line to obtain the primary wind state change sub-segment connecting line, number all the endpoints of the primary wind state change sub-segment connecting line as i, i=1, 2, 3...n, obtain the primary wind state value corresponding to one of the i+1 endpoints of the primary wind state change sub-segment connecting line on the Y axis, perform difference processing on it and the primary wind state value corresponding to the other adjacent endpoint i on the Y axis to obtain the primary wind state difference, if the primary wind state difference is greater than 0, mark the primary wind state change sub-segment as an ascending sub-segment, count the number of ascending sub-segments, perform ratio processing on it and the number of all primary wind state change sub-segments to obtain the ascending sub-segment number ratio SZ; The method for obtaining the mean value JZ of the slope difference of the ascending sub-segment is as follows: Based on the rising sub-segments obtained above, the slopes of all the rising sub-segments are obtained, and they are summed up and then averaged to obtain the mean slope of the rising sub-segments. The obtained mean slope of the rising sub-segments is first subtracted from the slope of the rising sub-segments and then processed by absolute value to obtain the slope difference of the rising sub-segments. The slope differences of all the rising sub-segments are counted and summed up and then averaged to obtain the mean of the slope differences of the rising sub-segments. The obtained mean of the slope differences of the rising sub-segments is ratioed with the mean slope of the rising sub-segments to obtain the mean proportion of the slope differences of the rising sub-segments JZ.

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