A dust cleaning method for filter bags of a dust collector and a related device

Abstract

The application discloses a dust cleaning and blowing method for filter bags of a dust remover and a related device, which can be used in the dust removal field. In the method, firstly, an inlet-outlet pressure difference of a filter bag area of the dust remover is obtained; then, when the inlet-outlet pressure difference is equal to a preset pressure drop, an interval time length of group blowing between a previous group of dust cleaning and blowing processes and a current group of dust cleaning and blowing processes is determined; the group of dust cleaning and blowing processes comprises multiple rounds of dust cleaning and blowing processes; then, based on the interval time length of group blowing and a preset mode determination rule, a blowing mode is determined; the blowing mode comprises constant-pressure blowing and constant-time blowing; finally, based on the blowing mode and a preset blowing rule, a group of dust cleaning and blowing processes is performed on the filter bags of the dust remover. Thus, the blowing mode is determined based on the interval time length of group blowing, the constant-pressure blowing and the constant-time blowing can be combined, dust attached to surfaces of the filter bags can be timely and effectively removed, and the service life of the filter bags is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust removal, in particular to a dust cleaning and blowing method for filter bags of a dust remover and related device. BACKGROUND

[0002] With the vigorous development of coal-fired power generation, cement production and metal processing industries, more and more attention has been paid to the large amount of dust pollution generated in the production process.

[0003] Currently, setting a dust remover at a dust emission port and the like is an important way to control dust pollution. Among them, bag-type dust removers and electric-bag composite dust removers are favored by more users and widely used due to their small footprint, high dust removal efficiency and the like. However, due to the difficulty in effectively removing the dust attached to the surface of the filter bag, the dust is accumulated on the surface of the filter bag for a long time, which may cause problems such as corrosion, wear and tear of the filter bag, and increase of the filtration resistance, thereby accelerating the damage of the filter bag, increasing the frequency of replacement of the filter bag and the cost required, and increasing the cost required for using such dust removers.

[0004] Therefore, how to effectively remove the dust attached to the surface of the filter bag and prolong the service life of the filter bag has become a problem to be solved. SUMMARY

[0005] Based on the above problems, the present application provides a dust cleaning and blowing method for filter bags of a dust remover and related device, which can effectively remove the dust attached to the surface of the filter bag and prolong the service life of the filter bag.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, the present application provides a dust cleaning and blowing method for filter bags of a dust remover, which comprises:

[0008] obtaining an inlet and outlet pressure difference of a filter bag area of the dust remover; the dust remover is provided with a gas inlet pipe penetrating through the filter bag area, one end of the gas inlet pipe is a dust inlet, and the other end is a dust outlet; the inlet and outlet pressure difference is the difference between the gas pressure of the dust inlet and the gas pressure of the dust outlet;

[0009] determining a group interval blowing time length from a previous group of dust cleaning and blowing processes to a time point when the inlet and outlet pressure difference is equal to a current preset pressure drop; the group of dust cleaning and blowing processes comprises a plurality of rounds of dust cleaning and blowing processes;

[0010] determining a blowing mode based on the group interval blowing time length and a preset mode determination rule; the blowing mode comprises constant pressure blowing and constant time blowing;

[0011] performing a group of dust cleaning and blowing processes on the filter bags of the dust remover based on the blowing mode and a preset blowing rule.

[0012] Optionally, the method further comprises:

[0013] if the interval time length is greater than or equal to a preset first time length, determining the blowing mode as a timed blowing mode;

[0014] if the interval time length is less than the preset first time length, determining the blowing mode as a constant pressure blowing mode.

[0015] Optionally, the constant pressure blowing mode comprises a plurality of preset pressure drops; and the method further comprises:

[0016] if the interval time length is less than a preset second time length, increasing a current preset pressure drop;

[0017] re-determining the interval time length based on the increased current preset pressure drop.

[0018] Optionally, the method further comprises:

[0019] determining a staggered blowing sequence of each blowing valve based on distances between the plurality of blowing valves and the dust inlet; the plurality of blowing valves are one-to-one correspondingly arranged on two sides of the inlet pipe, and one-to-one corresponding two blowing valves are a pair of blowing valves;

[0020] determining an opening time interval between blowing valves in an opening sequence based on the dust composition detection information of the dust inlet and the staggered blowing sequence; the opening time interval is a time interval between a closing time of a previous blowing valve and an opening time of a subsequent blowing valve;

[0021] performing a set of the dust blowing processes on the dust filter bag based on the blowing mode, the staggered blowing sequence of each blowing valve, and the opening time interval.

[0022] Optionally, the method further comprises:

[0023] obtaining a best compensation time length corresponding to the dust composition detection information based on the dust composition detection information of the dust inlet of the dust filter;

[0024] Based on the misaligned blowing sequence, a position coefficient of a to-be-opened blowing valve is obtained; the position coefficient of the blowing valve is positively correlated with the distance from the blowing valve to the dust inlet;

[0025] A product of the position coefficient of the to-be-opened blowing valve and the optimal compensation duration is calculated, and a sum of the product and a preset basic duration is taken as an opening time interval between adjacent blowing valves in the opening sequence.

[0026] Optionally, before the optimal compensation duration corresponding to the dust composition detection information is obtained based on the dust composition detection information of the dust inlet of the dust collector filter bag, the method further comprises:

[0027] First dust composition detection information of the dust inlet of the dust collector is obtained; the dust collector does not store past dust composition detection information similar to the first dust composition detection information within a preset similarity threshold;

[0028] A plurality of test compensation durations are selected within a preset duration range;

[0029] At least one round of ash cleaning blowing process is performed based on a plurality of test compensation durations, respectively, to obtain a plurality of inlet and outlet pressure differences;

[0030] A test compensation duration corresponding to a minimum value of the plurality of inlet and outlet pressure differences is taken as the optimal compensation duration, and a corresponding relationship between the optimal compensation duration and the first dust composition detection information is established.

[0031] Optionally, the blowing mode is constant pressure blowing, the blowing mode of the constant pressure blowing includes a plurality of preset pressure drops, a group of blowing valves includes a plurality of adjacent pairs of blowing valves or a pair of blowing valves, and the misaligned blowing sequence of each blowing valve is determined based on the distance from the plurality of blowing valves in the dust collector filter bag area to the dust inlet, comprising:

[0032] It is judged whether the current preset pressure drop is a maximum value in a plurality of preset pressure drops corresponding to a plurality of pressure drop levels, if yes, a first misaligned blowing sequence of each blowing valve is determined based on the distance from the plurality of blowing valves in the dust collector filter bag area to the dust inlet; the type of the first misaligned blowing sequence is a multi-blowing type of opening a group of blowing valves at the same time;

[0033] If not, a second misaligned blowing sequence of each blowing valve is determined based on the distance from the plurality of blowing valves in the dust collector filter bag area to the dust inlet; the type of the second misaligned blowing sequence is a single-blowing type of opening one blowing valve at the same time.

[0034] In a second aspect, the application provides a dust cleaning blowing device for a dust collector filter bag, the device comprising: an acquisition module, a group blowing interval duration determination module, a blowing mode determination module, and a dust cleaning module.

[0035] The acquisition module is configured to acquire an inlet-outlet pressure difference of the filter bag area of the dust collector; the dust collector is provided with an air inlet pipe penetrating through the filter bag area, one end of the air inlet pipe being a dust inlet and the other end being a dust outlet; the inlet-outlet pressure difference is the difference between the air pressure of the dust inlet and the air pressure of the dust outlet;

[0036] The interval time length determination module is configured to determine an interval time length between a time point when the inlet-outlet pressure difference is equal to a preset pressure drop and an ending time point of a previous group of dust removal spraying processes; the group of dust removal spraying processes includes multiple rounds of dust removal spraying processes;

[0037] The spraying mode determination module is configured to determine a spraying mode based on the interval time length and a preset mode determination rule; the spraying mode includes constant pressure spraying and constant time spraying;

[0038] The dust removal module is configured to perform a group of dust removal spraying processes on the filter bag of the dust collector based on the spraying mode and a preset spraying rule.

[0039] In a third aspect, the present application provides a dust collector, which comprises the dust removal spraying device of the filter bag of the dust collector according to the second aspect.

[0040] In a fourth aspect, the present application provides a computer readable storage medium, which stores computer instructions, when the computer instructions are run on a dust collector, the dust collector performs the steps of the dust removal spraying method of the filter bag of the dust collector according to any one of the first aspect.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] The application provides a dust cleaning and blowing method for a filter bag of a dust collector. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0044] Figure 1 A flow chart of a dust cleaning and blowing method for a filter bag of a dust collector is provided for the embodiments of the present application.

[0045] Figure 2 A structure diagram of an electric bag composite dust collector is provided for the embodiments of the present application.

[0046] Figure 3 A schematic diagram of a mode determination rule is provided for the embodiments of the present application.

[0047] Figure 4 Another structure diagram of an electric bag composite dust collector is provided for the embodiments of the present application.

[0048] Figure 5 A flow chart of a method for determining the opening time interval between adjacent opening valves in a dust collector is provided for the embodiments of the present application.

[0049] Figure 6 A schematic diagram of a dust cleaning and blowing device for a filter bag of a dust collector is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0050] The dust cleaning and spraying method of the filter bag of the dust remover and the related device provided by the application can be used in the dust removal field. The above is only an example and does not limit the application field of the dust cleaning and spraying method of the filter bag of the dust remover and the related device provided by the application.

[0051] The terms "first", "second", "third", and "fourth" and the like in the description, claims, and drawings of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

[0052] In the embodiments of the present application, the words "as an example" or "for example" are used to mean that an example, an illustration, or an explanation is given. Any embodiment or design scheme described as "as an example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the words "as an example" or "for example" are used in the specific manner to present the relevant concept.

[0053] The terms used in the embodiment part of the present application are only used for explaining the specific embodiments of the present application, and are not intended to limit the present application.

[0054] In order to enable persons skilled in the art to better understand the schemes of the present application, the technical schemes in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] Referring to Figure 1 The figure is a flow chart of the dust cleaning and spraying method of the filter bag of the dust remover provided by the embodiments of the present application, and the method comprises the following steps:

[0056] S101: Obtain the pressure difference between the inlet and outlet of the filter bag area of the dust remover.

[0057] Specifically, a plurality of filter bags are arranged in the dust remover, and the area where the filter bags are arranged is the filter bag area; an air inlet pipe can be arranged in the dust remover and penetrates the filter bag area, one end of the air inlet pipe is a dust inlet for enabling the gas to be dusted to enter the dust remover, and the other end is a dust outlet for enabling the dusted gas to be discharged from the dust remover; the pressure difference between the inlet and outlet is the difference between the pressure of the dust inlet and the pressure of the dust outlet.

[0058] For example, referring to Figure 2Fig. 1 is a structural diagram of an electric bag composite dust collector according to an embodiment of the present application. The dust collector comprises an electric zone 201, a filter bag zone 202, a filter bag zone inlet detection device 203, and a filter bag zone outlet detection device 204. The electric zone 201, the filter bag zone inlet detection device 203, the filter bag zone 202, and the filter bag zone outlet detection device 204 are sequentially connected. The filter bag zone inlet detection device 203 is located on the dust inlet side and is used to detect the dust condition in front of the filter bag. The filter bag zone inlet detection device 203 can include detection of the dust concentration, the distribution of dust particle size, the adhesion of dust, the filter bag inlet pressure, and the like at the filter bag inlet. The filter bag zone outlet detection device 204 is located on the dust outlet side and is used to detect the dust condition behind the filter bag. The filter bag zone outlet detection device 204 can include detection of the distribution of dust particle size, the filter bag outlet pressure, the outlet dust concentration, and the like at the filter bag outlet. The inlet-outlet pressure difference can be the difference between the filter bag outlet pressure and the filter bag inlet pressure detected above. The inlet-outlet pressure difference is mainly affected by the filter resistance of the filter bag. The greater the filter resistance, the greater the inlet-outlet pressure difference.

[0059] S102: Determine the group-to-group blowing interval duration from the end time of the previous group of cleaning blowing procedures to the time when the inlet-outlet pressure difference is equal to the current preset pressure drop.

[0060] As an example, a group of cleaning blowing procedures includes multiple rounds of cleaning blowing procedures. The specific rounds can be set based on actual needs. For example, a group of cleaning blowing procedures can be pre-set to include 100 rounds of cleaning blowing procedures.

[0061] As an example, the timing can be started at the end time of a group of cleaning blowing procedures. It is easy to understand that after the cleaning blowing procedure is performed, the inlet-outlet pressure difference of the dust collector will decrease. The timing can be stopped when the inlet-outlet pressure difference is equal to the current preset pressure drop again, so as to determine the group-to-group blowing interval duration from the end time of the previous group of cleaning blowing procedures.

[0062] S103: Determine the blowing mode based on the group-to-group blowing interval duration and a preset mode determination rule.

[0063] As an example, the same blowing mode can be used for all rounds of cleaning blowing procedures in a group of cleaning blowing procedures. The blowing mode can be re-determined based on the group-to-group blowing interval duration after each group of cleaning blowing procedures is performed. The blowing mode can include timed blowing and constant pressure blowing. The timed blowing is to perform a group of cleaning blowing procedures every fixed duration. The constant pressure blowing is to perform a group of cleaning blowing procedures when the inlet-outlet pressure difference reaches the preset pressure drop. A first duration can be pre-set. For example, the first duration can be 1 hour. When the group-to-group blowing interval duration is greater than or equal to the preset first duration, the blowing mode is determined to be timed blowing. When the group-to-group blowing interval duration is less than the preset first duration, the blowing mode is determined to be constant pressure blowing.

[0064] Referring to Figure 3The figure is a schematic diagram of a mode determination rule provided by an embodiment of the application. In the embodiment of the application, the constant pressure injection includes multiple pressure drop gears, each pressure drop gear corresponds to a different preset pressure drop. For example, the constant pressure injection can include five pressure drop gears, and the preset pressure drops corresponding to the five pressure drop gears are 800 Pa, 1000 Pa, 1200 Pa, 1500 Pa, and 2000 Pa, respectively. The above is only an example. It can be understood that the number of pressure drop gears and the preset pressure drop corresponding to each pressure drop gear can be set according to actual needs.

[0065] Optionally, when the first group of dust removal injection processes are performed after the dust remover is started, the injection mode can be set to constant pressure injection in advance, and at least one round of dust removal injection process is performed when the inlet and outlet pressure difference is equal to or greater than the current preset pressure drop. For example, 800 Pa can be set as the initial current preset pressure drop, and at least one round of dust removal injection process is performed when the inlet and outlet pressure difference reaches 800 Pa. After the execution is completed, the timing of the group interval injection duration is started.

[0066] For example, when the inlet and outlet pressure difference is equal to the current preset pressure drop 800 Pa again, the timing of the group interval injection duration is stopped, and the group interval injection duration is obtained. If the group interval injection duration is greater than or equal to the preset first duration, for example, greater than or equal to one hour, it indicates that the inlet and outlet pressure difference grows slowly, or the inlet and outlet pressure difference can be reduced to a lower level after a group of dust removal injection processes are performed. In order to avoid the dust from corroding the filter bag or hardening due to long-term accumulation on the surface of the filter bag, affecting the dust removal effect, the injection mode can be determined as constant time injection, for example, a group of dust removal injection processes are performed every 30 minutes. If the group interval injection duration is less than the preset first duration, it indicates that there is too much dust in the flue gas, so that the inlet and outlet pressure difference grows quickly, or the inlet and outlet pressure difference is still high after a group of dust removal injection processes are performed. At this time, the injection mode can be determined as constant pressure injection, for example, a group of dust removal injection processes are performed when the inlet and outlet pressure difference reaches 800 Pa again.

[0067] Optionally, in the constant time injection mode, if the group interval injection duration is less than the preset constant time duration, for example, less than 30 minutes, the injection mode can be switched from constant time injection to constant pressure injection. In the constant time injection mode, when the group interval injection duration is less than the preset first duration, the injection mode is switched to constant pressure injection.

[0068] Optionally, if the interval time length of group-to-group injection is less than a preset second time length, the current preset pressure drop can be increased; then, the interval time length of group-to-group injection is determined again based on the current preset pressure drop after the increase. The second time length is less than the first time length, for example, the second time length can be 15 seconds. When the interval time length of group-to-group injection is less than the preset second time length, it indicates that the current injection process for cleaning dust cannot effectively reduce the pressure difference between the inlet and outlet, at this time, the pressure drop gear can be changed to increase the current preset pressure drop, for example, the current preset pressure drop can be increased from 800 Pa to 1000 Pa. Taking 1000 Pa as the current preset pressure drop, the time length from the time point when the pressure difference between the inlet and outlet is equal to 1000 Pa to the time point when the previous group of injection process for cleaning dust ends is counted, to obtain a new interval time length of group-to-group injection and perform a new group of injection process for cleaning dust, so that the injection frequency between multiple rounds of injection process for cleaning dust is moderate during the execution of a group of injection process for cleaning dust in the constant pressure injection mode, and the service life of the filter bag of the dust collector is prolonged.

[0069] Therefore, when the pressure difference between the inlet and outlet increases slowly, or the pressure difference between the inlet and outlet can be reduced to a lower level after a group of injection process for cleaning dust is performed, the constant-time injection mode can be used to avoid long-term corrosion of the filter bag of the dust collector by the corrosive substances possibly contained in the dust, and to avoid the long-term accumulation of dust on the surface of the filter bag to affect the filtration resistance of the filter bag due to the hardening of the dust. When there is a lot of dust in the flue gas, so that the pressure difference between the inlet and outlet increases rapidly, or the pressure difference between the inlet and outlet is still high after a group of injection process for cleaning dust is performed, the constant-pressure injection mode can be used to remove the dust in time when the filtration resistance of the filter bag is high, that is, when there is a lot of dust attached to the surface of the filter bag, so as to combine the constant-pressure injection and the constant-time injection, delay the damage speed of the filter bag, prolong the service life of the filter bag, and reduce the cost required for replacing the filter bag of the dust collector.

[0070] Optionally, if the pressure difference between the inlet and outlet is greater than the preset first pressure drop and the interval time length of group-to-group injection is less than a preset third time length, a filter bag replacement prompt information can be output. For example, the preset first pressure drop can be 2000 Pa, and the preset third interval time length of group-to-group injection can be 15 seconds. Optionally, the filter bag replacement prompt information can include, but is not limited to, a buzzer alarm or an indicator light alarm.

[0071] Optionally, before outputting the filter bag replacement prompt information, the current preset pressure drop can be increased based on a preset pressure drop changing rule, and the dust removal spraying process can be continued in the constant pressure spraying mode based on the increased current preset pressure drop and the preset spraying rule. For example, when the current preset pressure drop is 2000 pa and the above conditions are met, the current preset pressure drop can be increased to 2100 pa based on the preset pressure drop changing rule, so that the dust collector can continue to work. The preset pressure drop changing rule can include a judgment condition and a corresponding pressure drop increasing step. For example, when the judgment condition of “the inlet and outlet pressure difference is greater than the preset first pressure drop and the group-to-group spraying interval time length is less than the preset third time length” is met, the pressure drop increasing step is 100 pa.

[0072] S104: Based on the spraying mode and the preset spraying rule, a set of dust removal spraying processes are performed on the filter bags of the dust collector.

[0073] For example, the dust collector filter bag area can include a plurality of filter bag compartments, each of which is configured with a plurality of filter bags and a plurality of spraying valves. Optionally, the number of filter bags and spraying valves in each filter bag compartment is the same, and the spraying valve can be a pulse spraying valve. The plurality of spraying valves are one-to-one correspondingly arranged on both sides of the inlet manifold, and the one-to-one corresponding two spraying valves form a pair of spraying valves. A group of spraying valves includes a plurality of pairs of adjacent spraying valves or a pair of spraying valves. The plurality of filter bag compartments can be arranged in a double-row arrangement, i.e., all filter bag compartments are divided into two rows and are one-to-one correspondingly arranged on both sides of the inlet manifold of the dust collector.

[0074] In the embodiments of the present application, the spraying order of each spraying valve and the opening time interval between adjacent spraying valves in the opening order can be determined based on the preset spraying rule. Specifically, the staggered spraying order of each spraying valve can be determined based on the distance between the plurality of spraying valves in the dust collector filter bag area and the dust inlet. The opening time interval between adjacent spraying valves in the opening order is determined based on the dust composition detection information of the dust inlet and the staggered spraying order. A set of dust removal spraying processes are performed based on the spraying mode, the staggered spraying order of each spraying valve, and the opening time interval. The opening time interval is the time interval between the closing time of the previous spraying valve and the opening time of the next spraying valve.

[0075] Optionally, the above determining the staggered blowing sequence of each blowing valve based on the distance between the plurality of blowing valves and the dust inlet in the dust collector can comprise: first, determining the blowing sequence of the plurality of filter bag compartments based on the distance between the plurality of filter bag compartments and the dust inlet in the dust collector, specifically, the blowing sequence of the plurality of filter bag compartments can be made to correspond to the distance between the plurality of filter bag compartments and the dust inlet from near to far, in particular, if the plurality of filter bag compartments adopts a double-row arrangement form, and the two filter bag compartments corresponding in position are not opened at the same time, then the blowing valves to be opened in all filter bag compartments on the same side of the dust collector can be opened in sequence first, and then the blowing valves to be opened in all filter bag compartments on the other side can be opened in sequence; then, the staggered blowing sequence of each blowing valve can be determined based on the distance between each blowing valve and the dust inlet, the corresponding relationship between the blowing valve and the filter bag compartment, and the blowing sequence of the plurality of filter bag compartments, specifically, in one filter bag compartment, the blowing valve configured therein can be opened in the order of the distance from the dust inlet from near to far; for the plurality of filter bag compartments, the blowing valve closest to the dust inlet among the blowing valves in the closed state configured in each filter bag compartment can be taken as the blowing valve to be opened, the blowing valve to be opened in each filter bag compartment is opened in sequence according to the blowing sequence of the plurality of filter bag compartments, then the blowing valve to be opened in each filter bag compartment is re-determined, the re-determined blowing valve to be opened in each filter bag compartment is opened in sequence according to the blowing sequence of the plurality of filter bag compartments, and the cycle is repeated, as the staggered blowing sequence of each blowing valve.

[0076] Specifically, referring to Figure 4Fig. 4 is a structural diagram of another electric bag composite dust collector provided by the embodiment of the present application, in which the dust collector is provided with four filter bag sub-chambers, the four filter bag sub-chambers are one-to-one corresponding in position, and are arranged in two rows on both sides of the dust inlet manifold of the dust collector. Each filter bag sub-chamber is provided with twenty blow valves. For the convenience of description, the filter bag sub-chambers on the side of the dust inlet manifold are assigned with numbers "sub-chamber one" and "sub-chamber two" from small to large in order of the distance from the dust inlet, and the filter bag sub-chambers on the other side are assigned with numbers "sub-chamber three" and "sub-chamber four" from small to large. In combination with the distance from the dust inlet, the twenty blow valves of the sub-chamber one can be assigned with numbers "1, 2, 3, …, 20" from small to large in order of the distance from the dust inlet. Similarly, the twenty blow valves of the sub-chamber two can be assigned with numbers "21, 22, 23, …, 40", the twenty blow valves of the sub-chamber three can be assigned with numbers "1', 2', 3', …, 20'", and the twenty blow valves of the sub-chamber four can be assigned with numbers "21', 22', 23', …, 40'". The number of the blow valve is positively correlated with the distance from the dust inlet, and can be used as the position coefficient of the blow valve. Thus, the closest one of the blow valves in the closed state in each filter bag sub-chamber to the dust inlet is taken as the blow valve to be opened. When the double-row arrangement form is adopted for the multiple filter bag sub-chambers, and the two filter bag sub-chambers corresponding in position are not opened at the same time, i.e., only one blow valve is opened at the same time, the above staggered blow sequence can be expressed as "1→21→1'→21'→2→22→2'→22'→3→23→3'→23'→4→24→4'→24'→……→20→40→20'→40'". When the double-row arrangement form is adopted for the multiple filter bag sub-chambers, and two filter bag sub-chambers corresponding in position are opened at the same time, i.e., a group of blow valves are opened at the same time, the above staggered blow sequence can be expressed as "1, 1'→21, 21'→2, 2'→22, 22'→3, 3'→23, 23'→4, 4'→24, 24'→……→20, 20'→40, 40'". As an example, if the group of blow valves includes two pairs of adjacent blow valves, the above staggered blow sequence can be expressed as "1, 1', 2, 2'→21, 21', 22, 22'→3, 3', 4, 4'→23, 23', 24, 24'→……→39, 39', 40, 40'".

[0077] Thus, the opening of the blow valves based on the staggered blow sequence can make the airflow generated by the opening of the blow valves more uniform, avoid the secondary dust raising after the adjacent filter bags are cleaned due to the opening of two groups of adjacent blow valves in turn, and avoid the turbulence of the blow airflow, thereby improving the cleaning effect on the filter bags of the dust collector.

[0078] Optionally, it can be judged whether the current preset pressure drop is the maximum value in the plurality of preset pressure drops corresponding to the plurality of pressure drop gears, if yes, the first staggered blowing sequence of each blowing valve is determined based on the distance between the plurality of blowing valves and the dust inlet in the filter bag area of the dust collector; if not, the second staggered blowing sequence of each blowing valve is determined based on the distance between the plurality of blowing valves and the dust inlet in the filter bag area of the dust collector. Wherein, the type of the first staggered blowing sequence is the multi-blowing type of opening a group of blowing valves at the same time; the type of the second staggered blowing sequence is the single-blowing type of opening one blowing valve at the same time. Thus, when the inlet and outlet pressure difference cannot be effectively reduced, a plurality of blowing valves can be opened at the same time in the process of executing the dust blowing process, thereby improving the dust removal effect. It can be understood that the multi-blowing type requires a larger gas storage capacity than the single-blowing type, and in order to realize multi-blowing, a standby gas tank can be pre-set, or a gas tank can be added before executing the dust blowing process in the staggered blowing sequence of the multi-blowing type.

[0079] Optionally, after each blowing valve executes the preset number of times of dust blowing process according to the above staggered blowing sequence, the lift valve of the filter bag compartment can be closed, so that the filter bag compartment no longer filters dust and performs offline dust removal. Thus, the relatively loose and not easily formed cake dust can be settled into the ash bucket, thereby achieving the purpose of reducing the inlet and outlet pressure difference.

[0080] In summary, in the embodiment of the present application, the blowing mode is determined based on the group blowing interval time length from the end time of the previous group of dust blowing processes when the inlet and outlet pressure difference is equal to the current preset pressure drop, which can combine the constant pressure blowing and the constant time blowing, avoid the problems that when the group blowing interval time length between the two groups of dust blowing processes is too long due to only using constant pressure blowing, the dust is long-term accumulated and corrodes the filter bag, or the dust is cakeed on the surface of the filter bag and affects the dust removal effect, and when the filtration resistance rises too fast due to only using constant time blowing, the inlet and outlet pressure difference is too large, which leads to the decrease of dust capture capacity, and the dust attached to the surface of the filter bag can be timely and effectively removed, thereby prolonging the service life of the filter bag.

[0081] Referring to Figure 5 The figure is a flow chart of a method for determining the opening time interval between the blowing valves with adjacent opening sequences in the dust collector provided by the embodiment of the present application. In the method, a round of dust blowing process is executed on the filter bag of the dust collector based on the staggered blowing sequence of each blowing valve, which can include the following steps:

[0082] S501: Obtain the dust composition detection information of the dust inlet of the dust collector, judge whether the dust collector stores the past dust composition detection information with a similarity within a preset similarity threshold to the dust composition detection information, if not, execute the steps described in S502; if yes, execute the steps described in S505.

[0083] As an example, the dust composition detection information can be obtained by, for exampleFigure 2 The filter bag area inlet detection device 203 shown in the figure detects the dust composition at the dust inlet, and obtains dust composition detection information such as dust inlet concentration, dust particle size distribution, and dust adhesion. The dust collector can include a control system such as a PLC (Programmable Logic Controller) for recording the detected dust composition detection information; the dust collector can also identify whether the currently detected dust composition detection information is the first dust composition detection information, and if so, perform the steps described in S502, and if not, perform the steps described in S505. If the dust collector does not store past dust composition detection information similar to the currently detected dust composition detection information within a preset similarity threshold, the currently detected dust composition detection information is the first dust composition detection information.

[0084] S502: Select a plurality of test compensation time lengths within a preset time length range.

[0085] As an example, 10 test compensation time lengths t1' can be selected within a preset time length range of, for example, 0.05 seconds to 1 second, for example, the 10 test compensation time lengths can be 0.06 seconds, 0.08 seconds, 0.1 seconds, 0.15 seconds, 0.2 seconds, 0.25 seconds, 0.3 seconds, 0.35 seconds, 0.4 seconds, and 0.45 seconds, respectively. The above is only an example, and the specific values of the preset time length range and the test compensation time length in the embodiments of the present application are not limited.

[0086] S503: Perform at least one round of dust cleaning injection process based on the plurality of test compensation time lengths respectively, and obtain a plurality of inlet and outlet pressure differences.

[0087] Specifically, for a plurality of test compensation time lengths t1', at least one round of dust cleaning injection process is performed based on any one of the test compensation time lengths, and the inlet and outlet pressure difference after each round of dust cleaning injection process is performed is obtained. For example, 10 test compensation time lengths t1' are preset, and 10 inlet and outlet pressure differences P1, P2, …, P10 can be obtained.

[0088] Optionally, before performing at least one round of dust cleaning injection process based on the plurality of test compensation time lengths respectively, the dust composition detection information of the dust inlet of the dust collector can be obtained once based on the plurality of test compensation time lengths, to avoid changes in dust composition during the process of performing dust cleaning injection process based on different test compensation time lengths, resulting in the best compensation time length obtained not being the best value among the plurality of test compensation time lengths; or the dust composition detection information of the dust inlet of the dust collector can be obtained only once before performing at least one round of dust cleaning injection process based on the plurality of test compensation time lengths, to reduce the computational load of the internal operation program of the dust collector and improve the computational speed.

[0089] S504: Corresponding relationship between the best compensation time length and the dust composition detection information is established by taking the minimum value of the plurality of import and export pressure differences as the test compensation time length.

[0090] Specifically, the import and export pressure differences after each round of dust cleaning injection process is executed can be compared. The smaller the import and export pressure difference, that is, the smaller the difference between the dust outlet pressure and the dust inlet pressure, the better the dust cleaning effect can be represented. The minimum value of the import and export pressure difference can be taken as the best compensation time length t1.

[0091] S505: Based on the dust composition detection information of the dust inlet of the dust collector, the best compensation time length t1 corresponding to the dust composition detection information is obtained.

[0092] Exemplarily, the best compensation time length t1 set in advance or determined through the steps described in S502-S504 can be recorded in the control system corresponding to the dust composition detection information. Before a new round of dust cleaning injection process starts, the current dust composition detection information can be detected first. Then it can be judged whether there is a recorded dust composition detection information in the one or more dust composition detection information recorded by the PLC control system, which has a similarity greater than a preset threshold with the current dust composition detection information. If yes, the compensation interval corresponding to the recorded dust composition detection information can be used as the compensation interval of the current round of dust cleaning injection process. If not, the compensation interval can be re-determined through the steps described in S502-S504 above, and the re-determined compensation interval t1 can be recorded in the control system corresponding to the current dust composition detection information.

[0093] S506: Based on the staggered injection sequence, the position coefficient N of the to-be-started injection valve is obtained.

[0094] Specifically, the position coefficient N of the injection valve is positively correlated with the distance from the injection valve to the dust inlet. For example, the injection valve with the shortest distance to the dust inlet can be determined as the first injection valve, and the injection valve with a longer distance to the dust inlet in two positionally adjacent injection valves is the Nth injection valve in the row, and N is the position coefficient of the injection valve.

[0095] The above-mentioned determination method of the position coefficient is only an example, and the position coefficient of the injection valve can also be determined based on, for example, the numerical value of the distance from the injection valve to the dust inlet in centimeter scale.

[0096] In the embodiments of the present application, based on the pre-determined staggered injection sequence, it can be known which injection valve is to be started, and then the position coefficient of the to-be-started injection valve is obtained.

[0097] S507: Calculate the product of the position coefficient N of the to-be-opened injection valve and the optimal compensation time t1, and take the sum of the product and the preset basic time t as the opening time interval between the two injection valves of adjacent opening sequence.

[0098] Specifically, the injection interval time T between groups can be calculated by the following formula: T=t+N*t1, wherein t is the preset basic time, which can be flexibly set based on the gas source and the gas tank compensation time, for example, it can be set to 15 seconds; N is the position coefficient of the to-be-opened injection valve; t1 is the optimal compensation time.

[0099] Optionally, if the current preset pressure drop is greater than or equal to the preset pressure drop threshold, the above-mentioned preset basic time t can be shortened, for example, if the preset pressure drop threshold is 1500pa and the current preset pressure drop is 2000pa, the preset basic time t can be gradually shortened from the original, for example, 15 seconds to, for example, 10 seconds.

[0100] In the embodiment of the application, there are multiple rows of filter bags in the direction perpendicular to the dust inlet pipe of the dust collector. Since the flow direction of the dust collected by the dust collector is from the dust inlet to the dust outlet, that is, the dust flows from the first row of filter bags near the dust inlet to the last row of filter bags. Therefore, the amount of dust that needs to be filtered by the first row of filter bags is greater than that of the second row of filter bags, and the amount of dust that needs to be filtered by the second row of filter bags is greater than that of the third row of filter bags. Usually, one row or several adjacent rows of filter bags in a filter bag compartment can be configured with one injection valve. Due to the difference in the amount of dust that needs to be filtered by each row of filter bags, the opening time interval between two injection valves of adjacent opening sequence that are closer to the dust inlet is shorter, and the opening time interval between two injection valves of adjacent opening sequence that are farther away from the dust inlet is longer, which can improve the dust cleaning effect.

[0101] Referring to Figure 6 The figure is a dust cleaning injection device for filter bags of a dust collector provided by the embodiment of the application, which includes an acquisition module 601, a group injection interval time determination module 602, an injection mode determination module 603, and a dust cleaning module 604.

[0102] The acquisition module 601 is configured to acquire the pressure difference between the inlet and outlet of the filter bag area of the dust collector. The dust collector is provided with an air inlet pipe that penetrates the filter bag area, one end of the air inlet pipe is a dust inlet, and the other end is a dust outlet. The pressure difference between the inlet and outlet is the difference between the air pressure of the dust inlet and the air pressure of the dust outlet.

[0103] The group injection interval time determination module 602 is configured to determine the group injection interval time from the end time of the previous group of dust cleaning injection processes to the time when the pressure difference between the inlet and outlet is equal to the current preset pressure drop. One group of dust cleaning injection processes includes multiple rounds of dust cleaning injection processes.

[0104] The blowing mode determination module 603 is configured to determine a blowing mode based on the interval length of the group-to-group blowing and preset mode determination rules. The blowing mode includes constant-pressure blowing and constant-time blowing.

[0105] The ash removal module 604 is configured to perform a set of ash removal blowing processes on the filter bag of the dust collector based on the blowing mode and preset blowing rules.

[0106] Optionally, the ash removal blowing device for the filter bag of the dust collector provided in the embodiments of the present application can include a first judgment unit and a determination unit in the blowing mode determination module 603. The first judgment unit is configured to determine whether the interval length of the group-to-group blowing is less than a preset first time length. If yes, the determination unit determines the blowing mode as constant-pressure blowing. If no, the determination unit determines the blowing mode as constant-time blowing.

[0107] Optionally, the blowing mode of the constant-pressure blowing includes a plurality of preset pressure drops in the embodiments of the present application. The ash removal blowing device for the filter bag of the dust collector provided in the embodiments of the present application further includes a second judgment module. The second judgment module is configured to determine whether the time length taken when the inlet and outlet pressure difference is equal to the current preset pressure drop is less than a preset second time length. If yes, the pressure drop gear is changed to increase the current preset pressure drop, and the interval length of the group-to-group blowing is determined again based on the increased current preset pressure drop. If no, the subsequent steps are performed based on the current interval length of the group-to-group blowing.

[0108] Optionally, the ash removal blowing device for the filter bag of the dust collector provided in the embodiments of the present application includes a blowing sequence determination unit 01, an opening time interval determination unit 02, and an ash removal unit 03. The dust collector provided in the embodiments of the present application includes a plurality of blowing valves that are one-to-one correspondingly arranged on both sides of the inlet pipe. One-to-one corresponding two blowing valves are a pair of blowing valves. The blowing sequence determination unit 01 is configured to determine the staggered blowing sequence of each blowing valve based on the distance between the plurality of blowing valves and the dust inlet in the filter bag area of the dust collector. The opening time interval determination unit 02 is configured to determine the opening time interval between the blowing valves with adjacent opening sequences based on the dust component detection information of the dust inlet and the staggered blowing sequence. The opening time interval is the time interval between the closing time of the previous blowing valve and the opening time of the subsequent blowing valve. The ash removal unit 03 is configured to perform a set of ash removal blowing processes on the filter bag of the dust collector based on the blowing mode, the staggered blowing sequence of each blowing valve, and the opening time interval.

[0109] Optionally, the opening time interval determination unit 02 is specifically configured to: based on the dust composition detection information of the dust inlet of the dust collector, obtain an optimal compensation duration corresponding to the dust composition detection information; based on the staggered blowing sequence, obtain a position coefficient of the to-be-opened blowing valve; the position coefficient of the blowing valve is positively correlated with the distance from the blowing valve to the dust inlet; and calculate the product of the position coefficient of the to-be-opened blowing valve and the optimal compensation duration, and take the sum of the product and a preset basic duration as the opening time interval between the blowing valves adjacent in the opening sequence.

[0110] Optionally, the opening time interval determination unit 02 can also be configured to: obtain first dust composition detection information of the dust inlet of the dust collector; the dust collector does not store past dust composition detection information similar to the first dust composition detection information within a preset similarity threshold; select a plurality of test compensation durations within a preset duration range; based on the plurality of test compensation durations, perform at least one round of ash blowing process to obtain a plurality of inlet and outlet pressure differences; take the test compensation duration corresponding to the minimum value in the plurality of inlet and outlet pressure differences as the optimal compensation duration, and establish a corresponding relationship between the optimal compensation duration and the first dust composition detection information.

[0111] Optionally, the group of blowing valves includes a plurality of adjacent pairs of blowing valves or a pair of blowing valves, and the blowing sequence determination unit 01 is specifically configured to: determine whether the current preset pressure drop is the maximum value in a plurality of preset pressure drops corresponding to a plurality of pressure drop levels, and if so, determine a first staggered blowing sequence of each blowing valve based on the distance from the plurality of blowing valves in the filter bag area of the dust collector to the dust inlet; the type of the first staggered blowing sequence is a multi-blowing type of opening a group of blowing valves at the same time; and if not, determine a second staggered blowing sequence of each blowing valve based on the distance from the plurality of blowing valves in the filter bag area of the dust collector to the dust inlet; the type of the second staggered blowing sequence is a single-blowing type of opening one blowing valve at the same time.

[0112] The application also provides a dust collector comprising the ash blowing device for the filter bag of the dust collector.

[0113] The application also provides a computer readable storage medium having computer instructions stored therein, when the computer instructions are executed on the dust collector, the dust collector executes the steps of the ash blowing method for the filter bag of the dust collector.

[0114] It should be noted that each of the embodiments of the present specification is described in a progressive manner, and the same or similar parts between the embodiments can be mutually referred to, and each of the embodiments focuses on the differences from other embodiments. In particular, for the device and storage medium embodiments, since they are basically similar to the method embodiments, they are described more simply, and the relevant parts can be referred to the part of the description of the method embodiments. The above-described device and storage medium embodiments are only illustrative, and the units described as separate components can or can not be physically separated, and the components indicated as units can or can not be physical units, that is, they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiments according to the actual needs. Those skilled in the art can understand and implement it without creative labor.

[0115] The above describes only one specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of cleaning a filter bag of a dust collector, characterized by, The method comprises: obtaining the pressure difference between the inlet and outlet of the filter bag area of the dust collector; the dust collector is provided with an air inlet pipe penetrating through the filter bag area, one end of the air inlet pipe is a dust inlet, and the other end is a dust outlet; the pressure difference between the inlet and outlet is the difference between the air pressure of the dust inlet and the air pressure of the dust outlet; determining the interval time length between the time when the pressure difference between the inlet and outlet is equal to the current preset pressure drop and the time when the previous group of cleaning blowing processes ends; the group of cleaning blowing processes comprises multiple rounds of cleaning blowing processes; determining the blowing mode based on the interval time length between the groups and the preset mode determination rule; the blowing mode comprises constant pressure blowing and constant time blowing; based on the blowing mode and the preset blowing rule, a group of cleaning blowing processes is performed on the filter bag of the dust collector; based on the blowing mode and the preset blowing rule, a group of cleaning blowing processes is performed on the filter bag of the dust collector; based on the distance between the plurality of blowing valves in the filter bag area of the dust collector and the dust inlet, the staggered blowing sequence of each blowing valve is determined; the plurality of blowing valves are correspondingly arranged on both sides of the air inlet pipe, and one-to-one corresponding two blowing valves form a pair of blowing valves; based on the dust composition detection information of the dust inlet of the dust collector, the best compensation time t1 corresponding to the dust composition detection information is obtained; based on the staggered blowing sequence, the position coefficient N of the to-be-started blowing valve is obtained; the position coefficient N of the blowing valve is positively correlated with the distance from the blowing valve to the dust inlet; the product of the position coefficient N of the to-be-started blowing valve and the best compensation time t1 is calculated, and the sum of the product and a preset basic time t is used as the opening time interval T between the blowing valves in the opening sequence, i.e. T=t+N*t1; the opening time interval is the time interval between the closing time of the previous blowing valve and the opening time of the next blowing valve; based on the blowing mode, the staggered blowing sequence of each blowing valve, and the opening time interval, a group of cleaning blowing processes is performed on the filter bag of the dust collector.

2. The method of claim 1, wherein, based on the interval time length between the groups and the preset mode determination rule, the blowing mode is determined, which comprises: if the interval time length between the groups is greater than or equal to a preset first time length, the blowing mode is determined to be constant time blowing; if the interval time length between the groups is less than the preset first time length, the blowing mode is determined to be constant pressure blowing.

3. The method of claim 1, wherein, The constant pressure blowing mode comprises a plurality of preset pressure drops; after the interval time length between the groups is determined, the method further comprises: if the interval time length between the groups is less than a preset second time length, the current preset pressure drop is increased; based on the increased current preset pressure drop, the interval time length between the groups is determined again.

4. The method of claim 1, wherein, before the best compensation time corresponding to the dust composition detection information of the dust inlet of the filter bag of the dust collector is obtained, the method further comprises: Obtain first dust component detection information of a dust inlet of the dust collector; the dust collector does not store past dust component detection information similar to the first dust component detection information within a preset similarity threshold; Select multiple test compensation time lengths within a preset time length range; Based on multiple test compensation time lengths, at least one round of ash removal blowing process is performed to obtain multiple inlet and outlet pressure differences; The minimum value of multiple inlet and outlet pressure differences corresponds to the test compensation time length as the best compensation time length, and the correspondence between the best compensation time length and the first dust component detection information is established.

5. The method of claim 1, wherein, The blowing mode is constant pressure blowing, the constant pressure blowing mode includes multiple preset pressure drops; a group of blowing valves includes multiple pairs of adjacent blowing valves or a pair of blowing valves; based on the distance between multiple blowing valves in the dust collector filter bag area and the dust inlet, the staggered blowing sequence of each blowing valve is determined, including: Determine whether the current preset pressure drop is the maximum value in the multiple preset pressure drops corresponding to the multiple pressure drop positions, if yes, based on the distance between multiple blowing valves in the dust collector filter bag area and the dust inlet, a first staggered blowing sequence of each blowing valve is determined; the type of the first staggered blowing sequence is the multi-blowing type of opening a group of blowing valves at the same time; If not, based on the distance between multiple blowing valves in the dust collector filter bag area and the dust inlet, a second staggered blowing sequence of each blowing valve is determined; the type of the second staggered blowing sequence is the single-blowing type of opening one blowing valve at the same time.

6. A dust collector filter bag cleaning jet cleaning device, characterized in that, The device includes an acquisition module, a group blowing interval time length determination module, a blowing mode determination module and an ash removal module; The acquisition module is used to acquire the inlet and outlet pressure difference of the dust collector filter bag area; the dust collector is provided with an air inlet pipe penetrating through the filter bag area, one end of the air inlet pipe is a dust inlet, and the other end is a dust outlet; the inlet and outlet pressure difference is the difference between the air pressure of the dust inlet and the air pressure of the dust outlet; The group blowing interval time length determination module is used to determine the group blowing interval time length from the end time of the previous group of ash removal blowing processes to the time when the inlet and outlet pressure difference is equal to the current preset pressure drop; the group of ash removal blowing processes includes multiple rounds of ash removal blowing processes; The blowing mode determination module is used to determine the blowing mode based on the group blowing interval time length and the preset mode determination rule; the blowing mode includes constant pressure blowing and constant time blowing; The ash removal module is used to perform a group of ash removal blowing processes on the dust collector filter bag based on the blowing mode and the preset blowing rule; The ash removal module includes a blowing sequence determination unit, an opening time interval determination unit and an ash removal unit; The blowing sequence determination unit is used to determine the staggered blowing sequence of each blowing valve based on the distance between multiple blowing valves in the dust collector filter bag area and the dust inlet; the multiple blowing valves are one-to-one correspondingly arranged on both sides of the air inlet pipe, and one-to-one corresponding two blowing valves are a pair of blowing valves; The opening time interval determination unit is configured to acquire, based on dust composition detection information of the dust inlet of the dust collector, an optimal compensation duration t1 corresponding to the dust composition detection information; Based on the staggered injection sequence, a position coefficient N of the to-be-opened injection valve is obtained; the position coefficient N of the injection valve is positively correlated with the distance from the injection valve to the dust inlet; A product of the position coefficient N of the to-be-opened injection valve and the optimal compensation duration t1 is calculated, and a sum of the product and a preset basic duration t is taken as an opening time interval T between injection valves in an opening sequence, i.e., T=t+N*t1; the opening time interval is a time interval between a closing time of a previous injection valve and an opening time of a subsequent injection valve; The dust cleaning unit is configured to execute, based on the injection mode, the staggered injection sequence of the injection valves, and the opening time interval, a set of the dust cleaning injection processes on the filter bag of the dust collector.

7. A dust extractor, characterized in that The dust collector comprises the dust cleaning injection device of the filter bag of the dust collector according to claim 6.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions, and when the computer instructions run on the dust collector, the dust collector executes the steps of the dust cleaning injection method of the filter bag of the dust collector according to any one of claims 1-5.

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