Efficient and energy-saving dry desulfurization device for coal-fired boiler

Abstract

The invention relates to the technical field of desulfurization treatment, in particular to an efficient and energy-saving coal-fired boiler dry desulfurization device which comprises a dry desulfurization mechanism, and the dry desulfurization mechanism comprises a desulfurizing agent spraying device and water mist spraying equipment; the water mist spraying device is located at a spraying opening of the spraying device. The efficient and energy-saving dry desulfurization device for the coal-fired boiler further comprises a data acquisition module and a data processing module. Pressure data, sulfur dioxide concentration data and gravity data are obtained through the data acquisition module, the pressure data, the sulfur dioxide concentration data and the gravity data are processed through the data processing module, and the pressure adjustment coefficient of the water mist spraying equipment at the current moment is obtained to control the water mist spraying amount. By arranging the water mist spraying equipment and controlling the water mist spraying amount of the water mist spraying equipment, the desulfurization reaction effect of the dry desulfurization device for the coal-fired boiler is improved, and waste of desulfurization resources is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization treatment, and in particular to a high-efficiency and energy-saving dry desulfurization device for a coal-fired boiler. Background Art

[0002] Coal-fired boilers are common energy production facilities and are widely used in electricity, heating and other fields. However, the sulfur dioxide in the flue gas emitted by coal-fired boilers causes serious harm to the environment and human health. Therefore, desulfurization technology is needed to control the sulfur dioxide emissions in the flue gas.

[0003] In the existing method, sulfur dioxide in the flue gas discharged by the coal-fired boiler is treated by dry desulfurization technology, wherein the dry desulfurization device for the coal-fired boiler in the existing method includes a dry desulfurization mechanism, such as Figure 1 The figure shows the structure of the dry desulfurization device for coal-fired boilers in the prior art. Figure 1 Among them, 1 is a boiler, 2 is a pipeline, 3 is a desulfurizer silo, 4 is a desulfurizer spraying device, 5 is a circulating fluidized bed reactor, 6 and 9 are infrared absorption analyzers, 7 is a cyclone separator, 8 is an electrostatic precipitator, 10 is a flue gas emission pipeline, 11 is a flue gas circulation pipeline, 12 is a pipeline pressure monitoring device, 13 and 16 are solid particle collecting devices, and 14 and 15 are gravity monitoring devices.

[0004] The operation process of the dry desulfurization device for a coal-fired boiler in the existing method is as follows: the flue gas containing sulfur dioxide generated in the boiler 1 is transmitted to the circulating fluidized bed reactor 5 through the pipeline 2, and the solid desulfurizer in the desulfurizer silo 3, such as limestone powder, is sprayed out from the desulfurizer silo 3 through the desulfurizer spraying device 4, and then the sprayed solid desulfurizer is transmitted to the circulating fluidized bed reactor 5 through the solid desulfurizer conveying pipeline, and chemically reacts with the sulfur dioxide in the flue gas to capture the sulfur dioxide in the flue gas and convert it into other compounds such as calcium sulfate, and the flue gas after the reaction and the solid particles generated by the reaction enter the cyclone separator 7 through the flue gas circulation pipeline 11, the cyclone separator 7 separates the solid particles, and transmits the separated solid particles to the solid particle collection device 13 connected to the cyclone separator 7, and then The flue gas purified by the cyclone separator 7 is transmitted to the electrostatic precipitator 8 through the flue gas circulation duct 11. The electrostatic precipitator 8 adsorbs the fine solid particles that the cyclone separator 7 fails to separate, and transmits the adsorbed fine solid particles to the solid particle collection device 16 connected to the electrostatic precipitator 8; the flue gas adsorbed by the electrostatic precipitator 8 is transmitted to the to-be-emitted monitoring point at the location of the infrared absorption analyzer 9 through the flue gas circulation duct 11, and the sulfur dioxide concentration in the to-be-emitted flue gas at the to-be-emitted monitoring point is monitored to determine whether the sulfur dioxide content in the to-be-emitted flue gas meets the standard. If it meets the standard, the flue gas to be discharged is discharged through the flue gas discharge duct 10. If it does not meet the standard, the flue gas to be discharged is transmitted to the circulating fluidized bed reactor 5 through the flue gas circulation duct 11 to continue to chemically react the sulfur dioxide in the flue gas with the solid desulfurizer. Among them, the sulfur dioxide concentration data in the circulating fluidized bed reactor 5 is obtained in real time through the infrared absorption analyzer 6; the sulfur dioxide concentration data at the emission monitoring point is obtained in real time through the infrared absorption analyzer 9; the pressure data in the pipeline is obtained in real time through the pipeline pressure monitoring equipment 12; gravity monitoring devices 14 and 15 are respectively installed in the solid particle collecting devices 13 and 16 to analyze the generation of solid particles in the solid particle collecting devices 13 and 16 in real time.

[0005] In actual situations, there is an insufficient reaction between the solid desulfurizer and the sulfur dioxide in the flue gas in the circulating fluidized bed reactor 5, resulting in a poor desulfurization effect, which in turn causes the flue gas to be discharged to fail to meet the standards quickly. Multiple desulfurization reactions are required in the circulating fluidized bed reactor 5, resulting in a large waste of desulfurization resources. Summary of the invention

[0006] In order to solve the technical problem that the solid desulfurizer does not react sufficiently with sulfur dioxide in the flue gas discharged by the coal-fired boiler, resulting in poor desulfurization effect and a large waste of desulfurization resources, the present invention provides a high-efficiency and energy-saving dry desulfurization device for coal-fired boilers, and the technical scheme adopted is as follows: A high-efficiency and energy-saving dry desulfurization device for a coal-fired boiler, comprising a dry desulfurization mechanism, wherein the dry desulfurization mechanism comprises a desulfurizer spraying device and a water mist spraying device; the water mist spraying device is located at the injection port of the spraying device, and the high-efficiency and energy-saving dry desulfurization device for a coal-fired boiler further comprises a data acquisition module and a data processing module; the output end of the data acquisition module is connected to the input end of the data processing module; The data acquisition module is used to obtain the pressure data of the pipeline at each moment, the sulfur dioxide concentration data at each moment at a specific position, and the gravity data at each moment at a preset position; The data processing module is used to obtain the positive degree of desulfurization in the current local time period according to the pressure data difference and sulfur dioxide concentration data difference between the current local time period and the previous adjacent local time period received; Based on the gravity data in the current local time period and the sulfur dioxide concentration data at the current moment, the degree of desulfurization deficiency in the current local time period is obtained; According to the positive degree of desulfurization and the lack of desulfurization, the pressure adjustment coefficient of the water mist spraying equipment at the current moment is obtained to control the water mist spraying amount.

[0007] Furthermore, the specific locations are the circulating fluidized bed reactor and the monitoring point to be discharged; The preset position is a solid particle collection device to which the cyclone separator and the electrostatic precipitator are respectively connected.

[0008] Furthermore, the method for obtaining the positive degree of desulfurization is: According to the fluctuation of pressure data in the current local time period, the pressure fluctuation degree of the current local time period is obtained; According to the change of sulfur dioxide concentration data in the circulating fluidized bed reactor in the current time period and the pressure fluctuation degree, the desulfurization disorder degree in the current local time period is obtained; The positive degree of desulfurization in the current local time period is obtained based on the difference in the degree of desulfurization disorder between the current local time period and its previous adjacent local time period, and the difference in sulfur dioxide concentration data at the monitoring point to be discharged.

[0009] Furthermore, the method for obtaining the pressure fluctuation degree is: Fit the pressure data in the current local time period into a pressure curve according to the time sequence; The extreme value points in the pressure curve are sequentially combined in pairs from front to back without overlap, and the difference of the pressure data corresponding to any two extreme value points in each combination is obtained as the first difference; The variance of all first differences is obtained as the pressure fluctuation degree value of the current local time period.

[0010] Furthermore, the method for obtaining the desulfurization disorder degree is: Arrange the sulfur dioxide concentration data in the circulating fluidized bed reactor in the current local time period according to the time sequence to obtain the current sulfur dioxide concentration data sequence; Arrange the moment data in the current local time period in chronological order to obtain the current moment data sequence; The result of normalizing the Pearson correlation coefficient between the current sulfur dioxide concentration data series and the current time data series is used as the response reference value of the current local time period; The desulfurization disorder degree of the current local time period is obtained according to the pressure fluctuation degree and the reaction reference value of the current local time period; wherein the pressure fluctuation degree and the reaction reference value are both positively correlated with the desulfurization disorder degree.

[0011] Furthermore, the method for obtaining the positive degree of desulfurization is: According to the desulfurization disorder degree of the current local time period and the previous adjacent local time period, a first desulfurization reference degree is obtained; wherein the desulfurization disorder degree of the previous adjacent local time period of the current local time period is positively correlated with the first desulfurization reference degree, and the desulfurization disorder degree of the current local time period is negatively correlated with the first desulfurization reference degree; The average value of the sulfur dioxide concentration data at all times at the emission monitoring point in the current local time period is used as the first reference value; The average of the sulfur dioxide concentration data at all times at the emission monitoring point in the previous adjacent local time period of the current local time period is used as the second reference value; taking the ratio of the second reference value to the first reference value as a second desulfurization reference value; According to the first desulfurization reference degree and the second desulfurization reference value, the positive desulfurization degree of the current local time period is obtained; wherein the first desulfurization reference degree and the second desulfurization reference value are both positively correlated with the positive desulfurization degree.

[0012] Furthermore, the method for obtaining the degree of desulfurization deficiency is: Obtaining the average value of gravity data at all times in the solid particle collection device connected to the cyclone separator in the current local time period as a first gravity reference value; Obtaining the average value of gravity data at all times in the solid particle collection device connected to the electrostatic precipitator in the current local time period as a second gravity reference value; According to the first gravity reference value and the second gravity reference value, a first lack of reference degree is obtained; wherein the first gravity reference value and the first lack of reference degree are in a positive correlation relationship, and the second gravity reference value and the first lack of reference degree are in a negative correlation relationship; The ratio of the sulfur dioxide concentration data at the emission monitoring point at the current moment to the sulfur dioxide concentration data of the atmospheric emission standard is used as the second lack reference value; The desulfurization deficiency degree of the current local time period is obtained according to the first deficiency reference degree and the second deficiency reference value; wherein the first deficiency reference degree and the second deficiency reference value are both positively correlated with the desulfurization deficiency degree.

[0013] Furthermore, the method for obtaining the pressure adjustment coefficient is: According to the positive degree of desulfurization and the degree of lack of desulfurization in the current local time period, the adjustment parameter at the current moment is obtained; wherein the positive degree of desulfurization is negatively correlated with the adjustment parameter, and the degree of lack of desulfurization is positively correlated with the adjustment parameter; The sum of the first preset constant and the adjustment parameter is used as the pressure adjustment coefficient of the water mist spraying equipment at the current moment.

[0014] Furthermore, the calculation formula of the pressure adjustment coefficient is: ; In the formula, is the pressure adjustment coefficient of the water mist spray equipment at the current moment; is a first preset constant, not less than 1; is the positive degree value of desulfurization in the current local time period; is the desulfurization deficiency value in the current local time period; tanh is a hyperbolic function; is the adjustment parameter at the current moment.

[0015] Furthermore, the method for obtaining the local time period is: The local time period is obtained by dividing the time period forward according to the preset time length from the current time as the starting point; wherein the local time period where the current time is located is taken as the current local time period.

[0016] The present invention has the following beneficial effects: A water mist spray device is installed at the injection port of the desulfurizer spray device. By spraying the sprayed solid desulfurizer with water mist, the water film on the surface of the solid desulfurizer is increased, which is more conducive to the reaction of the solid desulfurizer with sulfur dioxide and improves the desulfurization reaction effect. In order to accurately control the water mist spray volume of the water mist spray device, the positive degree of desulfurization in the current local time period is obtained according to the pressure data difference between the current local time period and the previous adjacent local time period, as well as the sulfur dioxide concentration data difference, which accurately reflects the desulfurization reaction state in the current local time period and indirectly reflects the degree to which the water mist spray volume of the water mist spray device needs to be adjusted at the current moment. Further based on the gravity data in the current local time period and the current moment The sulfur dioxide concentration data under the desulfurization is used to obtain the degree of desulfurization deficiency in the current local time period, which accurately reflects the insufficiency of the desulfurization reaction in the current local time period, and also indirectly reflects the degree to which the water mist spray volume of the water mist spray equipment at the current moment needs to be adjusted; and then according to the positive degree of desulfurization and the degree of desulfurization deficiency, the pressure adjustment coefficient of the water mist spray equipment at the current moment is accurately obtained, the water mist spray volume of the water mist spray equipment at the current moment is determined, and then the water mist spray volume of the water mist spray equipment is accurately adjusted, so that the sulfur dioxide in the flue gas discharged by the coal-fired boiler reacts more quickly, which improves the reaction effect of the solid desulfurizer and sulfur dioxide, reduces the waste of desulfurization resources, and improves the desulfurization efficiency of the dry desulfurization device of the coal-fired boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only 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.

[0018] Figure 1 It is a structural schematic diagram of a dry desulfurization device for a coal-fired boiler in an existing method; Figure 2 A schematic diagram of a data processing flow corresponding to a high-efficiency and energy-saving dry desulfurization device for a coal-fired boiler provided by the present invention; Figure 3 A flow chart of a method for obtaining a positive degree of desulfurization provided by the present invention; Figure 1 Among them, 1 is a boiler, 2 is a pipeline, 3 is a desulfurizer silo, 4 is a desulfurizer spraying device, 5 is a circulating fluidized bed reactor, 6 and 9 are infrared absorption analyzers, 7 is a cyclone separator, 8 is an electrostatic precipitator, 10 is a flue gas emission pipeline, 11 is a flue gas circulation pipeline, 12 is a pipeline pressure monitoring device, 13 and 16 are solid particle collecting devices, and 14 and 15 are gravity monitoring devices. DETAILED DESCRIPTION

[0019] The present embodiment provides a high-efficiency and energy-saving dry desulfurization device for coal-fired boilers, including a dry desulfurization mechanism. It is known that sulfur dioxide is more easily soluble in water. The higher the humidity, the easier it is for sulfur dioxide to contact with the water film on the surface of the solid desulfurizer, thereby increasing the reaction effect of sulfur dioxide and the solid desulfurizer in the dry desulfurization device for coal-fired boilers and reducing the waste of desulfurization resources. Therefore, in the present embodiment, a water mist spraying device is installed at the injection port of the desulfurizer spraying device to spray the sprayed solid desulfurizer with water mist, increase the water film on the surface of the solid desulfurizer, and is more conducive to the reaction of the solid desulfurizer with sulfur dioxide. Therefore, the dry desulfurization mechanism includes a boiler, a pipeline, a desulfurizer silo, a desulfurizer spraying device, a circulating fluidized bed reactor, an infrared absorption analyzer, a cyclone separator, an electrostatic precipitator, a flue gas emission pipeline, a flue gas circulation pipeline, a pipeline pressure monitoring device, a solid particle collection device, a gravity monitoring device and a water mist spraying device.

[0020] In actual situations, the amount of water mist sprayed by the water mist spraying equipment needs to be controlled. Too little or too much water mist spraying will affect the desulfurization reaction in the circulating fluidized bed reactor, resulting in less than optimal desulfurization effect. In order to better control the amount of water mist sprayed by the water mist spraying equipment, it is necessary to further analyze the data generated in the high-efficiency and energy-saving dry desulfurization device for coal-fired boilers. Therefore, the high-efficiency and energy-saving dry desulfurization device for coal-fired boilers also includes a data acquisition module and a data processing module, wherein the output end of the data acquisition module is connected to the input end of the data processing module.

[0021] The data acquisition module is used to obtain the pressure data of the pipeline at each moment, the sulfur dioxide concentration data at each moment at a specific position, and the gravity data at each moment at a preset position. It should be noted that in this embodiment, the pressure data of the pipeline at each moment is obtained through the pipeline pressure monitoring equipment; the specific positions are the circulating fluidized bed reactor and the monitoring point to be discharged, respectively, and the preset positions are the solid particle collection devices connected to the cyclone separator and the electrostatic precipitator respectively; the sulfur dioxide concentration data at each moment in the circulating fluidized bed reactor and the monitoring point to be discharged is obtained through the infrared absorption analyzer; the gravity data at each moment in the solid particle collection device is obtained through the gravity monitoring device. Among them, the pipeline pressure monitoring equipment, infrared absorption analyzer and gravity monitoring device are all installed before the flue gas discharged from the coal-fired boiler enters the dry desulfurization device of the coal-fired boiler. In this embodiment, the time interval between two adjacent moments of data collection is set to 0.5 seconds. The implementer can set the time interval between two adjacent moments according to the actual situation, which is not limited here.

[0022] The data processing module can be a data processing chip such as a CPU, MCU, FPGA, or a data processing device such as a computer host. The data acquisition module is connected to the data processing module, and the two can be connected by wire through a data transmission line, or by wireless communication methods such as Bluetooth and WiFi. In addition, the data acquisition module and the data processing module can also be integrated to form a device that integrates data acquisition and data processing functions.

[0023] The data processing module processes the data acquired by the data acquisition module, such as Figure 2 The figure shows a data processing flow diagram corresponding to a high-efficiency and energy-saving dry desulfurization device for a coal-fired boiler, which includes the following steps: Step S1: Obtain the desulfurization positive degree of the current local time period according to the received pressure data difference and sulfur dioxide concentration data difference between the current local time period and the previous adjacent local time period.

[0024] Specifically, in order to timely control the water mist spray volume of the water mist spray equipment at the current moment, this embodiment first analyzes the difference in desulfurization reaction between the current local time period and its previous adjacent local time period, and compares it with the previous adjacent local time period of the current local time period. If the pressure data in the current local time period is more stable and the sulfur dioxide concentration data is smaller, it means that the desulfurization effect of the current local time period is better, and the water mist spray volume of the current water mist spray equipment should be kept more stable, that is, there is no need to increase the water mist spray volume. Therefore, this embodiment obtains the positive degree of desulfurization in the current local time period based on the difference in pressure data received between the current local time period and its previous adjacent local time period, as well as the difference in sulfur dioxide concentration data. The greater the positive degree of desulfurization, the better the desulfurization effect in the dry desulfurization device of the coal-fired boiler in the current local time period, which indirectly reflects that the water mist spray volume of the water mist spray equipment at the current moment does not need to be adjusted.

[0025] In some possible implementations of this embodiment, the method for obtaining the local time period is: starting from the current moment and dividing it forward according to the preset duration to obtain the local time period. This embodiment sets the preset duration to 5 minutes. The implementer can set the size of the preset duration according to the actual situation, which is not limited here. The local time period where the current moment is located is taken as the current local time period. It should be noted that the data obtained in this embodiment is data during the operation of the high-efficiency and energy-saving coal-fired boiler dry desulfurization device, and there are at least two local time periods corresponding to the data in the data processing module.

[0026] Preferably, in some possible implementations of this embodiment, the method for obtaining the positive degree of desulfurization can be referred to Figure 3, which shows a flow chart of a method for obtaining a positive degree of desulfurization provided in this embodiment, the method comprising the following steps: Step S301: according to the fluctuation of the pressure data in the current local time period, obtain the pressure fluctuation degree of the current local time period.

[0027] Flue gas emitted by coal-fired boilers containing sulfur dioxide will continue to enter the dry desulfurization device of coal-fired boilers through pipelines. In order to ensure the stable desulfurization reaction in the dry desulfurization device of coal-fired boilers, the pressure in the pipeline should be kept stable to avoid pressure fluctuations that lead to unstable reaction conditions, which in turn lead to poor desulfurization effects. In order to analyze the desulfurization situation in the dry desulfurization device of coal-fired boilers in the current local time period, this embodiment obtains the pressure fluctuation degree of the current local time period based on the fluctuation of pressure data in the current local time period. The greater the pressure fluctuation degree, the more unstable the desulfurization reaction in the current local time period, which indirectly indicates that the desulfurization effect in the current local time period may be worse.

[0028] In some possible implementations of this embodiment, the method for obtaining the degree of pressure fluctuation is: fitting the pressure data in the current local time period into a pressure curve according to the time sequence; wherein, the method of fitting the curve is a well-known technology and will not be described in detail. The extreme points in the pressure curve are sequentially combined from front to back without overlapping, and the absolute value of the difference between the pressure data corresponding to any two extreme points in each combination is obtained, which is used as the first difference. For example, the extreme points on the pressure data curve are marked as 1, 2, 3...n from front to back, then the first combination is composed of two extreme points labeled 1 and 2, and the second combination is composed of two extreme points labeled 3 and 4, and so on, to obtain all combinations in the pressure curve. Among them, for the two extreme points in any combination, one must be a maximum point and the other must be a minimum point. It should be noted that when there is no extreme point that can be combined with the last extreme point in the pressure curve, the last extreme point in the pressure curve is not analyzed. Among them, when the difference between the first differences is larger, it means that the pressure curve is more unstable, which indirectly means that the pressure in the dry desulfurization device of the coal-fired boiler is more unstable in the current local time period. Therefore, this embodiment obtains the variance of all the first differences as the pressure fluctuation degree value of the current local time period. The larger the pressure fluctuation degree value, the more likely the desulfurization reaction in the dry desulfurization device of the coal-fired boiler is to be unstable in the current local time period, which indirectly means that the desulfurization effect in the current local time period may be worse.

[0029] Step S302: according to the change of the sulfur dioxide concentration data in the circulating fluidized bed reactor in the current time period and the pressure fluctuation degree, the desulfurization disorder degree in the current local time period is obtained.

[0030] The unstable pipeline pressure in the dry desulfurization device of a coal-fired boiler will have a certain impact on the desulfurization reaction, and the impact is reflected in the change of the sulfur dioxide concentration data in the circulating fluidized bed reactor. When the change of the sulfur dioxide concentration data in the circulating fluidized bed reactor does not show a continuous decrease, it means that the desulfurization reaction in the circulating fluidized bed reactor is more unstable, which indirectly indicates that the desulfurization effect of the dry desulfurization device of a coal-fired boiler is worse. It is known that the greater the pressure fluctuation, the more unstable the desulfurization reaction in the corresponding local time period may be. Therefore, this embodiment obtains the desulfurization disorder degree of the current local time period according to the change of the sulfur dioxide concentration data and the pressure fluctuation in the circulating fluidized bed reactor in the current time period. The greater the desulfurization disorder, the more unstable the desulfurization reaction in the circulating fluidized bed reactor in the current local time period, which indirectly indicates that the desulfurization effect of the dry desulfurization device of a coal-fired boiler in the current local time period may be worse.

[0031] In some possible implementations of this embodiment, the method for obtaining the degree of desulfurization disorder is: arrange the sulfur dioxide concentration data in the circulating fluidized bed reactor in the current local time period in chronological order to obtain the current sulfur dioxide concentration data sequence; arrange the moment data in the current local time period in chronological order to obtain the current moment data sequence; it should be noted that the overall change trend of the current moment data sequence is an upward trend. Obtain the Pearson correlation coefficient between the current sulfur dioxide concentration data sequence and the current moment data sequence. The larger the Pearson correlation coefficient, the less likely it is that the overall change trend of the current sulfur dioxide concentration data sequence is a downward trend, which indirectly indicates that the desulfurization reaction in the circulating fluidized bed reactor in the current local time period is more unstable. Considering that the value range of the Pearson correlation coefficient is There are negative numbers. In order to avoid the influence of negative numbers in the subsequent analysis process, this embodiment normalizes the Pearson correlation coefficient between the current sulfur dioxide concentration data sequence and the current time data sequence as the reaction reference value of the current local time period, so that the range of the reaction reference value is 0 to 1; wherein, the larger the reaction reference value, the more chaotic the desulfurization reaction in the circulating fluidized bed reactor in the current local time period. Among them, the method for obtaining the Pearson correlation coefficient is a well-known technology and will not be repeated. In order to more accurately analyze the desulfurization reaction of the coal-fired boiler dry desulfurization device in the current local time period, the degree of desulfurization disorder in the current local time period is obtained according to the pressure fluctuation degree and the reaction reference value of the current local time period; wherein, the pressure fluctuation degree and the reaction reference value are both positively correlated with the degree of desulfurization disorder. The greater the degree of desulfurization disorder, the more unstable the desulfurization reaction of the coal-fired boiler dry desulfurization device in the current local time period, which indirectly indicates that the desulfurization effect of the coal-fired boiler dry desulfurization device in the current local time period is worse.

[0032] In order to accurately indicate the desulfurization disorder degree of the dry desulfurization device of the coal-fired boiler in the current local time period, this embodiment specifically quantifies the desulfurization disorder degree as a desulfurization disorder degree value. The larger the desulfurization disorder degree value, the more unstable the desulfurization reaction in the current local time period. The calculation formula of the desulfurization disorder degree value is: ; In the formula, is the desulfurization disorder degree value of the current local time period; is the pressure fluctuation value of the current local time period; is the Pearson correlation coefficient between the current sulfur dioxide concentration data sequence and the current moment data sequence; is the response reference value of the current local time period; norm is the normalization function.

[0033] At this point, the desulfurization disorder degree value of the current local time period is obtained.

[0034] Step S303: Obtain the desulfurization positive degree of the current local time period according to the difference in desulfurization disorder degree between the current local time period and its previous adjacent local time period, and the difference in sulfur dioxide concentration data at the monitoring point to be discharged.

[0035] In order to more accurately analyze whether the desulfurization reaction of the dry desulfurization device of the coal-fired boiler is in a good desulfurization reaction state in the current local time period, this embodiment compares the desulfurization situation of the current local time period with the previous adjacent local time period. When the desulfurization disorder degree of the current local time period is smaller than the desulfurization disorder degree of the previous adjacent local time period of the current local time period, it means that the desulfurization reaction state of the current local time period is better. Among them, according to the method for obtaining the desulfurization disorder degree of the current local time period, the desulfurization disorder degree of the previous adjacent local time period of the current local time period is obtained. In order to more accurately analyze the difference in desulfurization reaction between the current local time period and the previous adjacent local time period, this embodiment further compares the sulfur dioxide concentration data at the monitoring point to be discharged in the current local time period and the previous adjacent local time period. When the sulfur dioxide concentration data at the monitoring point to be discharged in the current local time period is relatively small as a whole, it means that the desulfurization state of the current local time period is better. Therefore, this embodiment obtains the positive degree of desulfurization in the current local time period according to the difference in the desulfurization disorder degree between the current local time period and the previous adjacent local time period, and the difference in the sulfur dioxide concentration data at the monitoring point to be discharged. The greater the positive degree of desulfurization, the better the desulfurization state of the coal-fired boiler dry desulfurization device in the current local time period.

[0036] In some possible implementations of this embodiment, the method for obtaining the positive degree of desulfurization is as follows: it is known that the greater the desulfurization disorder degree of the previous adjacent local time period of the current local time period is than the desulfurization disorder degree of the current local time period, it means that the desulfurization state in the current local time period is better, and then according to the desulfurization disorder degree of the current local time period and its previous adjacent local time period, the first desulfurization reference degree is obtained; wherein, the desulfurization disorder degree of the previous adjacent local time period of the current local time period is positively correlated with the first desulfurization reference degree, and the desulfurization disorder degree of the current local time period is negatively correlated with the first desulfurization reference degree; the larger the first desulfurization reference degree is, the better the desulfurization reaction effect in the current local time period. In order to further analyze the desulfurization reaction in the current local time period, the mean value of the sulfur dioxide concentration data at all times at the monitoring point to be discharged in the current local time period is obtained as the first reference value; the mean value of the sulfur dioxide concentration data at all times at the monitoring point to be discharged in the previous adjacent local time period of the current local time period is obtained as the second reference value; when the second reference value is greater than the first reference value, it means that the desulfurization effect in the current local time period is better, and then the ratio of the second reference value to the first reference value is used as the second desulfurization reference value; when the second desulfurization reference value is larger, it means that the larger the second reference value, the smaller the first reference value, and the better the desulfurization effect in the current local time period. Therefore, this embodiment obtains the positive degree of desulfurization in the current local time period according to the first desulfurization reference degree and the second desulfurization reference value; wherein, the first desulfurization reference degree and the second desulfurization reference value are both positively correlated with the positive degree of desulfurization. The greater the positive degree of desulfurization, the better the desulfurization effect of the dry desulfurization device of the coal-fired boiler in the current local time period, which indirectly indicates that the water mist spray volume of the water mist spray equipment at the current moment does not need to be adjusted.

[0037] In order to accurately express the desulfurization effect of the dry desulfurization device for coal-fired boilers in the current local time period, this embodiment specifically quantifies the desulfurization positive degree as a desulfurization positive degree value. The larger the desulfurization positive degree value, the better the desulfurization effect of the dry desulfurization device for coal-fired boilers in the current local time period. The calculation formula of the desulfurization positive degree value is: ; In the formula, is the positive degree value of desulfurization in the current local time period; is the desulfurization disorder degree value of the previous adjacent local time period of the current local time period; is the desulfurization disorder degree value of the current local time period; is the second preset constant, which is greater than 0; is the second reference value; is the first reference value; is the first desulfurization reference degree value; It is the second desulfurization reference value.

[0038] This embodiment will Set to 0.1 to avoid the denominator being 0. The implementer can set it according to the actual situation. The size is not limited here.

[0039] At this point, the desulfurization positive degree value of the current local time period is obtained.

[0040] Step S2: Based on the gravity data in the current local time period and the sulfur dioxide concentration data at the current moment, the degree of desulfurization deficiency in the current local time period is obtained.

[0041] Specifically, there are cyclone separators and electrostatic precipitators in the dry desulfurization device of coal-fired boilers, wherein the cyclone separator is at the front end of the electrostatic precipitator, and the cyclone separator is usually used as a pretreatment device before the electrostatic precipitator to remove larger solid particles, so as to reduce the workload of the electrostatic precipitator and extend the cleaning cycle of the electrode plate of the electrostatic precipitator. The cyclone separator is used to separate larger solid particles, and the electrostatic precipitator is used to adsorb smaller solid particles. Among them, the solid desulfurizer is used to carry out the desulfurization reaction in the form of fine solid particles or powder. Therefore, when the larger solid particles separated by the cyclone separator are more and the fewer solid particles adsorbed by the electrostatic precipitator are less, it means that the sulfur dioxide in the flue gas is more likely to have an insufficient reaction, because the more larger solid particles separated by the cyclone separator, the better the desulfurization reaction state, and the fewer solid particles adsorbed by the electrostatic precipitator, the less solid desulfurizer is insufficient, which leads to the insufficient reaction of sulfur dioxide in the flue gas. In order to accurately analyze the situation of solid particles, this embodiment uses the gravity data obtained by the gravity monitoring device in the solid particle collection device to illustrate the distribution of solid particles. In the current local time period, when the gravity data in the solid particle collection device connected to the cyclone separator is larger and the gravity data in the solid particle collection device connected to the electrostatic precipitator is smaller, it means that the desulfurization reaction in the current local time period is more likely to be incomplete, which indirectly means that the desulfurization reaction at the current moment is less thorough. In order to further analyze the desulfurization reaction at the current moment, and then obtain the sulfur dioxide concentration data at the checkpoint to be discharged at the current moment, when the sulfur dioxide concentration data at the checkpoint to be discharged at the current moment is larger, it means that the desulfurization reaction of the dry desulfurization device of the coal-fired boiler at the current moment is less thorough. Furthermore, this embodiment obtains the degree of desulfurization deficiency in the current local time period based on the gravity data in the current local time period and the sulfur dioxide concentration data at the current moment. The greater the degree of desulfurization deficiency, the less thorough the desulfurization reaction in the current local time period, which indirectly indicates that the desulfurization effect at the current moment is worse. The water mist spray volume of the water mist spray equipment at the current moment should be increased to enhance the desulfurization reaction effect of the dry desulfurization device of the coal-fired boiler.

[0042] Preferably, in some possible implementations of this embodiment, the method for obtaining the degree of desulfurization deficiency is: obtaining the mean value of the gravity data at all times in the solid particle collection device connected to the cyclone separator in the current local time period as the first gravity reference value, the larger the first gravity reference value, the better the desulfurization reaction state in the current local time period; obtaining the mean value of the gravity data at all times in the solid particle collection device connected to the electrostatic precipitator in the current local time period as the second gravity reference value, the smaller the second gravity reference value, the greater the possibility of insufficient solid desulfurization agent, which indirectly indicates that the desulfurization reaction in the current local time period is more likely to be insufficient. Comparing the first gravity reference value with the second gravity reference value further highlights the situation of the desulfurization reaction in the current local time period, therefore, according to the first gravity reference value and the second gravity reference value, the first degree of deficiency reference is obtained; wherein, the first gravity reference value is positively correlated with the first degree of deficiency reference, and the second gravity reference value is negatively correlated with the first degree of deficiency reference; wherein, the larger the first degree of deficiency reference is, the less thorough the desulfurization reaction in the current local time period is. In order to further analyze the desulfurization reaction at the current moment, the ratio of the sulfur dioxide concentration data at the monitoring point to be discharged at the current moment to the sulfur dioxide concentration data of the atmospheric emission standard is obtained as the second lack reference value; the larger the second lack reference value, the larger the sulfur dioxide concentration data at the monitoring point to be discharged at the current moment, which indirectly indicates that the desulfurization reaction effect at the current moment is worse. Furthermore, this embodiment obtains the desulfurization lack degree of the current local time period according to the first lack reference degree and the second lack reference value; wherein, the first lack reference degree and the second lack reference value are both positively correlated with the desulfurization lack degree. It should be noted that the atmospheric emission standard sulfur dioxide concentration data is well known.

[0043] In order to accurately indicate the degree of desulfurization deficiency in the current local time period, this embodiment specifically quantifies the degree of desulfurization deficiency as a desulfurization deficiency degree value. The larger the desulfurization deficiency degree value, the worse the desulfurization effect in the current local time period, which indirectly indicates that the desulfurization effect at the current moment is worse. The calculation formula of the desulfurization deficiency degree value is: ; In the formula, is the desulfurization deficiency value in the current local time period; is the first gravity reference value; is the second gravity reference value; is the third preset constant, which is greater than 0; is the first lack of reference degree value; The sulfur dioxide concentration data at the monitoring point to be discharged at the current moment; The sulfur dioxide concentration data for atmospheric emission standards; For the second lack of reference value.

[0044] This embodiment will Set to 0.1 to avoid the denominator being 0. The implementer can set it according to the actual situation. The size is not limited here.

[0045] At this point, the desulfurization deficiency degree value of the current local time period is obtained.

[0046] Step S3: According to the positive degree of desulfurization and the lack of desulfurization, the pressure adjustment coefficient of the water mist spraying equipment at the current moment is obtained to control the water mist spraying amount.

[0047] Specifically, it is known that the greater the positive degree of desulfurization, the better the desulfurization state in the current local time period, which indirectly means that the better the desulfurization state at the current moment, the more stable the water mist spray volume of the water mist spray equipment at the current moment should be; when the degree of desulfurization deficiency is greater, the more insufficient the desulfurization reaction in the current local time period is, which indirectly means that the desulfurization effect at the current moment is worse, the water mist spray volume of the water mist spray equipment at the current moment should be increased to improve the desulfurization effect of the dry desulfurization device of the coal-fired boiler; therefore, this embodiment obtains the pressure adjustment coefficient of the water mist spray equipment at the current moment to control the water mist spray volume according to the positive degree of desulfurization and the degree of desulfurization deficiency.

[0048] Preferably, in some possible implementations of this embodiment, the method for obtaining the pressure adjustment coefficient is: according to the positive degree of desulfurization and the degree of lack of desulfurization in the current local time period, the adjustment parameter at the current moment is obtained; wherein, the positive degree of desulfurization is negatively correlated with the adjustment parameter, and the degree of lack of desulfurization is positively correlated with the adjustment parameter; the larger the adjustment parameter, the greater the degree to which the water mist spray volume of the water mist spray equipment at the current moment needs to be increased. The sum of the first preset constant and the adjustment parameter is used as the pressure adjustment coefficient of the water mist spray equipment at the current moment. The larger the pressure adjustment coefficient, the more water mist spray volume the water mist spray equipment needs to adjust at the current moment. The calculation formula of the pressure adjustment coefficient is: ; In the formula, The pressure adjustment coefficient of the water mist spray equipment at the current moment; is a first preset constant, not less than 1; is the positive degree value of desulfurization in the current local time period; is the desulfurization deficiency value in the current local time period; tanh is a hyperbolic function; is the adjustment parameter at the current moment.

[0049] This embodiment will Set to 1, real-time users can set it according to actual conditions The size is not limited here.

[0050] The water mist spray volume of the water mist spray equipment at the current moment is regulated by the pressure adjustment coefficient of the water mist spray equipment at the current moment. The water mist sprayed by the water mist spray equipment can increase the water film on the surface of the solid desulfurizer, improve the reaction degree of the solid desulfurizer with sulfur dioxide in the flue gas, and then timely improve the desulfurization reaction effect of the dry desulfurization device of the coal-fired boiler and reduce the waste of desulfurization resources.

[0051] In summary, the present embodiment includes a dry desulfurization mechanism, the dry desulfurization mechanism includes a desulfurizer spray device and a water mist spray device; the water mist spray device is located at the injection port of the spray device, and the high-efficiency and energy-saving coal-fired boiler dry desulfurization device also includes a data acquisition module and a data processing module; the pressure data, sulfur dioxide concentration data and gravity data are obtained by the data acquisition module, and the pressure data, sulfur dioxide concentration data and gravity data are processed by the data processing module to obtain the pressure adjustment coefficient of the water mist spray device at the current moment to control the water mist spray amount. The present invention improves the desulfurization reaction effect of the coal-fired boiler dry desulfurization device by setting a water mist spray device and controlling the water mist spray amount of the water mist spray device, and reduces the waste of desulfurization resources.

[0052] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0053] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. An efficient and energy-saving dry desulfurization device for a coal-fired boiler, comprising a dry desulfurization mechanism, wherein the dry desulfurization mechanism comprises a desulfurizer spraying device and a water mist spraying device; the water mist spraying device is located at the injection port of the spraying device, characterized in that: The high-efficiency and energy-saving dry desulfurization device for coal-fired boilers further comprises a data acquisition module and a data processing module; the output end of the data acquisition module is connected to the input end of the data processing module; The data acquisition module is used to obtain the pressure data of the pipeline at each moment, the sulfur dioxide concentration data at each moment at a specific position, and the gravity data at each moment at a preset position; The data processing module is used to obtain the positive degree of desulfurization in the current local time period according to the pressure data difference and sulfur dioxide concentration data difference between the current local time period and the previous adjacent local time period received; Based on the gravity data in the current local time period and the sulfur dioxide concentration data at the current moment, the degree of desulfurization deficiency in the current local time period is obtained; According to the positive degree of desulfurization and the lack of desulfurization, the pressure adjustment coefficient of the water mist spraying equipment at the current moment is obtained to control the water mist spraying amount; The method for obtaining the pressure adjustment coefficient is: According to the positive degree of desulfurization and the degree of lack of desulfurization in the current local time period, the adjustment parameter at the current moment is obtained; wherein the positive degree of desulfurization is negatively correlated with the adjustment parameter, and the degree of lack of desulfurization is positively correlated with the adjustment parameter; The sum of the first preset constant and the adjustment parameter is used as the pressure adjustment coefficient of the water mist spraying device at the current moment; The calculation formula of the pressure adjustment coefficient is: ; In the formula, is the pressure adjustment coefficient of the water mist spray equipment at the current moment; is a first preset constant, not less than 1; is the positive degree value of desulfurization in the current local time period; is the desulfurization deficiency value in the current local time period; tanh is a hyperbolic function; is the adjustment parameter at the current moment.

2. A high-efficiency and energy-saving dry desulfurization device for coal-fired boilers as claimed in claim 1, characterized in that: The specific locations are the circulating fluidized bed reactor and the monitoring point to be discharged; The preset position is a solid particle collection device to which the cyclone separator and the electrostatic precipitator are respectively connected.

3. A high-efficiency and energy-saving dry desulfurization device for coal-fired boilers as claimed in claim 2, characterized in that: The method for obtaining the positive degree of desulfurization is: According to the fluctuation of pressure data in the current local time period, the pressure fluctuation degree of the current local time period is obtained; According to the change of sulfur dioxide concentration data in the circulating fluidized bed reactor in the current time period and the pressure fluctuation degree, the desulfurization disorder degree in the current local time period is obtained; The positive degree of desulfurization in the current local time period is obtained based on the difference in the degree of desulfurization disorder between the current local time period and its previous adjacent local time period, and the difference in sulfur dioxide concentration data at the monitoring point to be discharged.

4. A high-efficiency and energy-saving dry desulfurization device for coal-fired boilers as claimed in claim 3, characterized in that: The method for obtaining the pressure fluctuation degree is: Fit the pressure data in the current local time period into a pressure curve according to the time sequence; The extreme value points in the pressure curve are sequentially combined in pairs from front to back without overlap, and the difference of the pressure data corresponding to any two extreme value points in each combination is obtained as the first difference; The variance of all first differences is obtained as the pressure fluctuation degree value of the current local time period.

5. The high-efficiency and energy-saving dry desulfurization device for coal-fired boilers according to claim 3, characterized in that: The method for obtaining the desulfurization disorder degree is: Arrange the sulfur dioxide concentration data in the circulating fluidized bed reactor in the current local time period according to the time sequence to obtain the current sulfur dioxide concentration data sequence; Arrange the moment data in the current local time period in chronological order to obtain the current moment data sequence; The result of normalizing the Pearson correlation coefficient between the current sulfur dioxide concentration data series and the current time data series is used as the response reference value of the current local time period; The desulfurization disorder degree of the current local time period is obtained according to the pressure fluctuation degree and the reaction reference value of the current local time period; wherein the pressure fluctuation degree and the reaction reference value are both positively correlated with the desulfurization disorder degree.

6. A high-efficiency and energy-saving dry desulfurization device for coal-fired boilers as claimed in claim 3, characterized in that: The method for obtaining the positive degree of desulfurization is: According to the desulfurization disorder degree of the current local time period and the previous adjacent local time period, a first desulfurization reference degree is obtained; wherein the desulfurization disorder degree of the previous adjacent local time period of the current local time period is positively correlated with the first desulfurization reference degree, and the desulfurization disorder degree of the current local time period is negatively correlated with the first desulfurization reference degree; The average value of the sulfur dioxide concentration data at all times at the emission monitoring point in the current local time period is used as the first reference value; The average of the sulfur dioxide concentration data at all times at the emission monitoring point in the previous adjacent local time period of the current local time period is used as the second reference value; taking the ratio of the second reference value to the first reference value as a second desulfurization reference value; According to the first desulfurization reference degree and the second desulfurization reference value, the positive desulfurization degree of the current local time period is obtained; wherein the first desulfurization reference degree and the second desulfurization reference value are both positively correlated with the positive desulfurization degree.

7. A high-efficiency and energy-saving dry desulfurization device for coal-fired boilers as claimed in claim 2, characterized in that: The method for obtaining the desulfurization deficiency degree is: Obtaining the average value of gravity data at all times in the solid particle collection device connected to the cyclone separator in the current local time period as a first gravity reference value; Obtaining the average value of gravity data at all times in the solid particle collection device connected to the electrostatic precipitator in the current local time period as a second gravity reference value; According to the first gravity reference value and the second gravity reference value, a first lack of reference degree is obtained; wherein the first gravity reference value and the first lack of reference degree are in a positive correlation relationship, and the second gravity reference value and the first lack of reference degree are in a negative correlation relationship; The ratio of the sulfur dioxide concentration data at the emission monitoring point at the current moment to the sulfur dioxide concentration data of the atmospheric emission standard is used as the second lack reference value; The desulfurization deficiency degree of the current local time period is obtained according to the first deficiency reference degree and the second deficiency reference value; wherein the first deficiency reference degree and the second deficiency reference value are both positively correlated with the desulfurization deficiency degree.

8. The high-efficiency and energy-saving dry desulfurization device for coal-fired boilers according to claim 1, characterized in that: The method for obtaining the local time period is: The local time period is obtained by dividing the time period forward according to the preset time length from the current time as the starting point; wherein the local time period where the current time is located is taken as the current local time period.

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