阅读说明：本技术 一种袋式除尘器的智能清灰控制方法 (Intelligent ash removal control method of bag type dust collector ) 是由 刘艳 刘滨 胡建鹏 张翼 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种袋式除尘器的智能清灰控制方法,将清灰程序和除尘器出口排放以及整体除尘器阻力联系起来,设置压差变送器,监控袋室的压差均衡状况,使得袋式除尘器的压差稳定、波动小,减少滤袋被压缩空气冲击的次数,滤袋寿命大大延长,又根据出风口处采集的实时粉尘浓度调整压差上下限值和间隔清灰时间,避免多余的清灰动作,保护滤袋表面的粉尘层,减少超细粉尘的逃逸和系统能耗,提高滤袋的使用寿命,最大程度减少因清灰所产生的排放,实现出口粉尘浓度保持在超低排放。(The invention discloses an intelligent dust cleaning control method of a bag type dust collector, which relates a dust cleaning program with dust collector outlet discharge and integral dust collector resistance, sets a differential pressure transmitter, monitors the differential pressure balance condition of a bag chamber, ensures that the differential pressure of the bag type dust collector is stable and has small fluctuation, reduces the times of the filter bag impacted by compressed air, greatly prolongs the service life of the filter bag, adjusts the upper and lower limit values of the differential pressure and the interval dust cleaning time according to the real-time dust concentration collected at an air outlet, avoids redundant dust cleaning action, protects the dust layer on the surface of the filter bag, reduces the escape of ultrafine dust and the system energy consumption, improves the service life of the filter bag, reduces the discharge caused by dust cleaning to the maximum extent, and realizes the ultra-low discharge of the outlet dust concentration.)

1. An intelligent ash removal control method of a bag type dust collector is characterized in that: the method specifically comprises the following steps:

(1) setting an upper limit value P1 of the pressure difference needing to be subjected to ash removal, a lower limit value P2 of the pressure difference needing to be subjected to ash removal, interval ash removal time T and ash removal dust setting concentration PM1 in a controller by combining the initial operation pressure difference of the bag type dust collector and the pressure difference after the operation setting time;

(2) the method comprises the steps that a pressure difference transmitter in a bag type dust collector collects real-time total pressure difference before and after dust removal of the bag type dust collector in real time, when the real-time total pressure difference is not smaller than a pressure difference upper limit value P1, a controller starts a dust cleaning mode, namely an air outlet channel is closed, compressed air is sprayed into a bag chamber, deposited dust on the outer surface of a filter bag is removed, in the dust cleaning process, when the real-time total pressure difference reaches a pressure difference lower limit value P2, the controller stops the dust cleaning mode, namely the air outlet channel is opened, the compressed air is sprayed into the filter bag, and when the real-time total pressure difference reaches a set pressure difference upper limit value P1;

(3) the dust monitoring instrument arranged at the air outlet of the bag type dust collector collects the real-time dust concentration at the air outlet in real time, when the real-time dust concentration exceeds the set dust concentration PM1 of the ash removal, the controller automatically adds the pressure difference to the upper pressure difference limit value P1 and the lower pressure difference limit value P2 set in the step (1) to set an increase value to form a new upper pressure difference limit value P1 and a new lower pressure difference limit value P2, and automatically adds the time to the interval ash removal time T set in the step (1) to set an increase value to form a new interval ash removal time T, so that redundant ash removal actions are avoided, a dust layer on the surface of the filter bag is protected, the escape of ultrafine dust and the system energy consumption are reduced, and the service life of the filter.

2. The intelligent ash removal control method of the bag type dust collector as claimed in claim 1, wherein: the pressure difference upper limit value P1 is 50 +/-10 Pa higher than the pressure difference lower limit value P2.

3. The intelligent ash removal control method of the bag type dust collector as claimed in claim 1, wherein: one end of a pressure difference transmitter in the bag type dust collector is connected with the ash removal bag chamber, the other end of the pressure difference transmitter is connected with an air purifying chamber in the bag type dust collector, and the air purifying chamber is arranged between the ash removal bag chamber and the air outlet.

4. The intelligent ash removal control method of the bag type dust collector as claimed in claim 1, wherein: after the controller starts the ash removal mode, namely after the air outlet channel is closed, compressed air is firstly sprayed into the bag chamber No. 1, the ash removal treatment is carried out on the bag chamber No. 1, then the compressed air is sprayed into the bag chambers No. 2, No. 3 and all the bag chambers one by one, and in the ash removal process, when the real-time total pressure difference reaches the lower pressure difference limit value P2, the controller stops the ash removal mode, namely the cleaning of the rest bag chambers is stopped, and the air outlet channel is opened and the compressed air is stopped being sprayed into the filter bags.

5. The intelligent ash removal control method of the bag type dust collector as claimed in claim 1, wherein: and (4) setting the pressure difference in the step (3) to be 20 Pa.

6. The intelligent ash removal control method of the bag type dust collector as claimed in claim 1, wherein: and (4) setting the time increasing value in the step (3) to be 5 s.

7. The intelligent ash removal control method of the bag type dust collector as claimed in claim 3, wherein: the air outlet channel is positioned between the air purifying chamber and the air outlet, a lifting valve plate is arranged at the air outlet channel, and the opening and closing of the air outlet channel are realized through the opening and closing of the lifting valve plate.

8. The intelligent ash removal control method of the bag type dust collector as claimed in claim 1, wherein: the controller comprises a single chip microcomputer, a keyboard input device and a display screen, the keyboard input device and the display screen are respectively connected with the single chip microcomputer, the single chip microcomputer is used for starting and controlling the ash removal mode in the step (2), the keyboard input device is used for inputting the pressure difference upper limit value P1, the pressure difference lower limit value P2, the interval ash removal time T and the ash removal dust set concentration PM1 in the step (1), and the display screen displays the real-time total pressure difference and the real-time dust concentration in real time.

Technical Field

The invention relates to the field of bag type dust collectors, in particular to an intelligent dust cleaning control method of a bag type dust collector.

Background

The bag type dust collector has the working principle of filtering-deashing-filtering, wherein the filtering is to realize gas-solid separation through a filter bag and remove dust particles in dust-containing gas, and the deashing is to clear away dust accumulated on the filter bag through pulse compressed air and restore the filtering performance of the filter bag again. The ash cleaning process comprises the following steps: closing off-line valve of certain ash cleaning unit, spraying compressed air into the interior of filter bag to remove the dust deposit on the external surface of filter bag, opening off-line valve and making said ash cleaning unit return to filtering state again. The traditional ash removal method is mainly used for removing ash at regular time, and the ash removal action of each unit is completed according to the set ash removal period or unit interval, and if the ash removal time is unreasonable, the ash removal is excessive sometimes, so that a second filter layer which needs to be reserved is removed, and the filtering efficiency of the dust remover is reduced; sometimes, the ash removal is insufficient, and the differential pressure of the dust remover is too high, so that the ventilation of the system is influenced.

Disclosure of Invention

The invention aims to solve the technical problem of providing an intelligent dust removal control method for a bag type dust collector, which solves the defects of the traditional timing dust removal, has stable pressure difference and small fluctuation, reduces the times of the filter bag impacted by compressed air, and greatly prolongs the service life of the filter bag.

The technical scheme of the invention is as follows:

an intelligent ash removal control method of a bag type dust collector specifically comprises the following steps:

(1) setting an upper limit value P1 of the pressure difference needing to be subjected to ash removal, a lower limit value P2 of the pressure difference needing to be subjected to ash removal, interval ash removal time T and ash removal dust setting concentration PM1 in a controller by combining the initial operation pressure difference of the bag type dust collector and the pressure difference after the operation setting time;

(2) the method comprises the steps that a pressure difference transmitter in a bag type dust collector collects real-time total pressure difference before and after dust removal of the bag type dust collector in real time, when the real-time total pressure difference is not smaller than a pressure difference upper limit value P1, a controller starts a dust cleaning mode, namely an air outlet channel is closed, compressed air is sprayed into a bag chamber, deposited dust on the outer surface of a filter bag is removed, in the dust cleaning process, when the real-time total pressure difference reaches a pressure difference lower limit value P2, the controller stops the dust cleaning mode, namely the air outlet channel is opened, the compressed air is sprayed into the filter bag, and when the real-time total pressure difference reaches a set pressure difference upper limit value P1;

(3) the dust monitoring instrument arranged at the air outlet of the bag type dust collector collects the real-time dust concentration at the air outlet in real time, when the real-time dust concentration exceeds the set dust concentration PM1 of the ash removal, the controller automatically adds the pressure difference to the upper pressure difference limit value P1 and the lower pressure difference limit value P2 set in the step (1) to set an increase value to form a new upper pressure difference limit value P1 and a new lower pressure difference limit value P2, and automatically adds the time to the interval ash removal time T set in the step (1) to set an increase value to form a new interval ash removal time T, so that redundant ash removal actions are avoided, a dust layer on the surface of the filter bag is protected, the escape of ultrafine dust and the system energy consumption are reduced, and the service life of the filter.

The pressure difference upper limit value P1 is 50 +/-10 Pa higher than the pressure difference lower limit value P2.

One end of a pressure difference transmitter in the bag type dust collector is connected with the ash removal bag chamber, the other end of the pressure difference transmitter is connected with an air purifying chamber in the bag type dust collector, and the air purifying chamber is arranged between the ash removal bag chamber and the air outlet.

After the controller starts the ash removal mode, namely after the air outlet channel is closed, compressed air is firstly sprayed into the bag chamber No. 1, the ash removal treatment is carried out on the bag chamber No. 1, then the compressed air is sprayed into the bag chambers No. 2, No. 3 and all the bag chambers one by one, and in the ash removal process, when the real-time total pressure difference reaches the lower pressure difference limit value P2, the controller stops the ash removal mode, namely the cleaning of the rest bag chambers is stopped, and the air outlet channel is opened and the compressed air is stopped being sprayed into the filter bags.

And (4) setting the pressure difference in the step (3) to be 20 Pa.

And (4) setting the time increasing value in the step (3) to be 5 s.

The air outlet channel is positioned between the air purifying chamber and the air outlet, a lifting valve plate is arranged at the air outlet channel, and the opening and closing of the air outlet channel are realized through the opening and closing of the lifting valve plate.

The controller comprises a single chip microcomputer, a keyboard input device and a display screen, the keyboard input device and the display screen are respectively connected with the single chip microcomputer, the single chip microcomputer is used for starting and controlling the ash removal mode in the step (2), the keyboard input device is used for inputting the pressure difference upper limit value P1, the pressure difference lower limit value P2, the interval ash removal time T and the ash removal dust set concentration PM1 in the step (1), and the display screen displays the real-time total pressure difference and the real-time dust concentration in real time.

The invention has the advantages that:

the invention relates the ash cleaning program to the outlet discharge of the dust collector and the resistance of the whole dust collector, sets the differential pressure transmitter, monitors the differential pressure balance condition of the bag chamber, ensures that the differential pressure of the bag type dust collector is stable and has small fluctuation, reduces the times of the filter bag being impacted by compressed air, greatly prolongs the service life of the filter bag, adjusts the upper and lower limit values of the differential pressure and the interval ash cleaning time according to the real-time dust concentration collected at the air outlet, avoids redundant ash cleaning action, protects the dust layer on the surface of the filter bag, reduces the escape of ultrafine dust and the energy consumption of a system, improves the service life of the filter bag, furthest reduces the discharge caused by ash cleaning, and realizes the ultra-low discharge of the outlet dust.

Drawings

Fig. 1 is a schematic structural diagram of a bag type dust collector of the present invention, wherein 1 is a differential pressure transmitter, 2 is an ash removal bag chamber, 3 is a gas purification chamber, 4 is an air outlet, 5 is a poppet valve plate, 6 is a dust monitor, and 7 is an air inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An intelligent ash removal control method of a bag type dust collector specifically comprises the following steps:

(1) setting an upper limit value P1 of the pressure difference needing to be subjected to ash removal, a lower limit value P2 of the pressure difference needing to be subjected to ash removal, interval ash removal time T and ash removal dust setting concentration PM1 in a controller by combining the initial operation pressure difference of the bag type dust collector and the pressure difference after the operation setting time, wherein the upper limit value P1 of the pressure difference is 50 +/-10 Pa higher than the lower limit value P2 of the pressure difference;

(2) the method comprises the following steps that a pressure difference transmitter 1 in a bag type dust collector collects real-time total pressure difference before and after dust removal of the bag type dust collector in real time, one end of the pressure difference transmitter 1 in the bag type dust collector is connected with an ash removal bag chamber 2, the other end of the pressure difference transmitter 1 is connected with an air purification chamber 3 in the bag type dust collector, the air purification chamber 3 is arranged between the ash removal bag chamber 2 and an air outlet 4, when the real-time total pressure difference is not less than an upper pressure difference limit value P1, a controller starts an ash removal mode, namely, after a poppet valve plate 5 at an air outlet channel is closed, compressed air is firstly sprayed into a bag chamber No. 1, ash removal treatment is carried out on the bag chamber No. 1, then the compressed air is sprayed into the bag chambers No. 2, No. 3 and all the bag chambers successively, in the ash removal process, when the real-time total pressure difference reaches a lower pressure difference limit value P2, the controller stops the ash removal mode, when the real-time total pressure difference reaches the set pressure difference upper limit value P1 again, the ash removal program is started again; the controller comprises a single chip microcomputer, a keyboard input device and a display screen, wherein the keyboard input device and the display screen are respectively connected with the single chip microcomputer, the single chip microcomputer is used for starting and controlling the ash removal mode in the step (2), the keyboard input device is used for inputting the pressure difference upper limit value P1, the pressure difference lower limit value P2, the interval ash removal time T and the ash removal dust set concentration PM1 in the step (1), and the display screen displays the real-time total pressure difference and the real-time dust concentration in real time;

(3) the dust monitor 6 arranged at the air outlet of the bag type dust collector collects the real-time dust concentration at the air outlet in real time, when the real-time dust concentration exceeds the set dust cleaning concentration PM1, the controller automatically adds the pressure difference setting increasing value 20 Pa to the pressure difference upper limit value P1 and the pressure difference lower limit value P2 set in the step (1) to form a new pressure difference upper limit value P1 and a new pressure difference lower limit value P2, and automatically adds the time setting increasing value 5s to the interval dust cleaning time T set in the step (1) to form a new interval dust cleaning time T, so that redundant dust cleaning actions are avoided, a dust layer on the surface of the filter bag is protected, the escape of ultrafine dust and the energy consumption of a system are reduced, and the service life of the filter bag is prolonged.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.