Cloth bag dust removal and ash removal system and application thereof

Abstract

The invention relates to a cloth bag dust removal and ash removal system and application thereof. The cloth bag dust removal and ash removal system comprises a dust remover, an ash removal pipeline, an ash discharging bin, a fan, an ash discharging valve, a discharging valve and a PLC. The dust remover comprises an upper box body, a middle box body and a lower box body which are sequentially connected from top to bottom; a dust discharging valve is arranged at the bottom end of the dust remover and is connected with a dust cleaning pipeline; the head of the ash removal pipeline is connected with a fan, and the tail is connected with an ash discharge bin; the bottom end of the ash discharging bin is connected with a discharging valve; and the fan, the cindervalve and the discharge valve are all connected and controlled by a PLC (Programmable Logic Controller). According to the invention, the structure of the bag type dust removal device system is simplified, an ash discharge system of the scraper ash conveyor is eliminated, and a support platform of the scraper ash conveyor is omitted, so that the construction cost and the operation cost of the bag type dust removal device system are greatly reduced. Meanwhile, the intelligent dust collecting and discharging functions of the dust removal system are achieved through a PLC, the automatic and intelligent operation level of the production technology is greatly improved, and high-quality development of industrial production is promoted.

Description

Technical Field

[0001] The invention relates to a bag dust removal and cleaning system and application thereof, and in particular to an industrial flue gas dust removal and cleaning process, belonging to the technical field of industrial flue gas treatment. Background Art

[0002] The bag filter is a dry dust filter. It is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of textile filter cloth or non-textile felt, and uses the filtering effect of fiber fabric to filter the dust-containing gas. When the dust-containing gas enters the bag filter, the large particles and heavy dust settle down due to gravity and fall into the ash hopper. When the gas containing finer dust passes through the filter material, the dust is retained, so that the gas is purified.

[0003] Chinese patent document CN219441019U discloses a novel bag dust collector, which is provided with a fixed support plate and a movable baffle. When it is necessary to clean the dust in the dust removal chamber, the push-pull cylinder is started. After the push-pull cylinder is started, the movable baffle is pulled to open the movable baffle. At this time, the box body and the ash hopper are connected, while the diverter pipe and the box body are not connected. Then the dust cleaning fan and the ventilator are started, and the ventilator fills the external air into the first air chamber. At this time, the dust cleaning fan compresses the air in the first air chamber and introduces it into the telescopic pipe through the air inlet pipe, and then sprays the diamond-shaped cloth bag through multiple groups of blowing pipes to clean the dust covered on the outer surface of the diamond-shaped cloth bag. The cleaned dust falls into the ash hopper and is then discharged along the ash discharge valve. During cleaning, the external smoke cannot enter the box body, so that the dust removal chamber in the box body can be thoroughly cleaned.

[0004] like Figure 1 As shown in the figure, the main structure of the traditional bag filter is mainly composed of the upper box, the middle box, the lower box (ash hopper), the ash cleaning system, the ash discharge system and the like. The ash discharge system includes the ash discharge valve, the scraper ash conveyor and the like. The ash discharge valve is installed at the bottom of the lower box (ash hopper) and is vertically connected to the scraper ash conveyor. The ash discharge valve automatically discharges ash to the scraper ash conveyor under manual control. The continuously running scraper ash conveyor transports the powder ash to the ash bin in time. Then, the ash bin is manually controlled to discharge the powder ash to the ash truck at a fixed time. The ash truck transports the powder ash for other uses.

[0005] In the above-mentioned traditional process system, the scraper ash conveyor is placed on the supporting platform. The supporting platform is a reinforced concrete casting platform supported by multiple platform pillars. A sufficient height distance is reserved between the platform and the ground to facilitate the reasonable placement of the ash bin. The supporting platform occupies a large vertical space; the ash bin is an independent facility system, which is placed on the outside of one end of the platform. It is huge in size and occupies a large ground area and space above the ground.

[0006] In the existing narrow and crowded industrial production sites where every inch of land is valuable, especially in some old industrial renovation projects, due to the narrow and limited space around the renovation project, there is often no place to place the huge ash silo equipment, which in turn makes the construction of the bag dust removal process system impossible to complete. Based on this, further transforming and optimizing the existing bag dust removal process system to simplify the production process of the bag dust removal process system and reduce the volume of production equipment has become the main problem to be solved by the present invention. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a bag dust removal and cleaning system. The system adopts a brand-new structural design, which greatly saves production site space as a whole, and uses PLC to achieve intelligent control, realize the operation process of automatic unloading, cleaning and transportation, and greatly improve the cleaning efficiency.

[0008] The present invention also provides a working method of the above-mentioned bag dust removal and cleaning system.

[0009] The technical solution of the present invention is as follows:

[0010] A bag dust removal and cleaning system, comprising a dust collector, a cleaning pipeline, a dust discharge bin, a fan, a dust discharge valve, a discharge valve and a PLC;

[0011] The dust collector comprises an upper box body, a middle box body and a lower box body which are connected in sequence from top to bottom. A dust discharge valve is arranged at the bottom of the dust collector and is connected to a dust cleaning pipeline.

[0012] The head of the dust removal pipeline is connected to the fan, and the tail is connected to the dust discharge bin; the bottom of the dust discharge bin is connected to the discharge valve;

[0013] The fan, ash discharge valve and discharge valve are all connected and controlled by PLC.

[0014] Preferably, a return air duct is connected to the top of the dust unloading bin, and the return air duct extends from the box body into the dust collector.

[0015] Preferably, the bottom end of the return air duct is located 20-40 cm above the bottom of the middle box body.

[0016] Preferably, the dust unloading bin is located on one side of the dust collector and is fixedly connected to the side wall of the dust collector.

[0017] Preferably, the bottom end of the ash unloading bin is at least 4.0 m above the ground. The advantage of this design is that the ash transport truck can be directly parked under the ash unloading bin, and the ash storage tank of the ash transport truck can be directly filled by opening the ash unloading valve.

[0018] Preferably, an ash bag is provided at the bottom of the ash unloading bin. The advantage of this design is that the ash bag can be tightly connected to the ash storage tank of the ash truck to prevent dust from escaping to the outside and polluting the atmosphere during the unloading process.

[0019] Preferably, a first upper material level meter and a first lower material level meter are provided in the lower box body, and both the first upper material level meter and the first lower material level meter are connected and controlled by PLC.

[0020] Preferably, a second upper material level meter and a second lower material level meter are provided in the ash unloading bin; the second upper material level meter and the second lower material level meter are both connected and controlled by a PLC.

[0021] Preferably, the blower is a Roots blower.

[0022] Preferably, the volume of the ash unloading bin is 0.5-1.0 times the volume of the ash storage tank of the ash transport truck. The advantage of this design is that the volume of ash accumulated between the upper level meter and the lower level meter in the ash unloading bin should not exceed the capacity of the ash storage tank of the ash transport truck.

[0023] A working method of a bag dust removal and cleaning system comprises the following steps:

[0024] 1) During the operation of the dust collector, when the first upper material level meter detects that the dust in the lower box has accumulated to a certain extent, it transmits the signal to the PLC; the PLC controls the dust discharge valve and the Roots blower to open, and the dust in the lower box enters the dust cleaning pipe and is blown into the dust discharge bin with the help of the high-pressure wind input by the Roots blower, and the air is returned to the middle box from the return air duct;

[0025] 2) When the second loading level meter detects that the dust in the ash unloading bin has accumulated to the right position, it transmits the signal to the PLC; the PLC controls the unloading valve to open and fill the ash storage tank of the ash truck through the ash unloading bag;

[0026] 3) When the second material level meter detects that the dust in the ash unloading bin has fallen to the right position, it transmits the signal to the PLC; the PLC controls the unloading valve to close, the ash truck leaves the loading point, and the next ash truck stops at the loading point;

[0027] 4) When the first lower material level meter detects that the dust in the lower box has fallen to the right position, the signal is transmitted to the PLC; the PLC controls the ash discharge valve and the Roots blower to close;

[0028] 5) Repeat steps 1)-4) to achieve continuous unloading.

[0029] Technical features and beneficial effects of the present invention:

[0030] 1. The present invention simplifies the system structure of the bag dust removal device, eliminates the ash discharge system of the scraper ash conveyor, and saves the support platform of the scraper ash conveyor, thereby greatly reducing the construction cost of the bag dust removal device system.

[0031] 2. The present invention further simplifies the production process, reduces the inspection and maintenance costs of system equipment, production and operation costs, and improves the efficiency of ash removal operations.

[0032] 3. The present invention greatly reduces the volume and floor space of the dust removal bin equipment, so that the bag dust removal device system can be reasonably constructed in industrial production sites with limited space.

[0033] 4. The present invention adopts PLC to realize the intelligent ash collection and discharge functions of the dust removal system, greatly improves the automation and intelligent operation level of the production process, and promotes the high-quality development of industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the traditional process flow;

[0035] Figure 2 It is a schematic diagram of the process flow of the present invention;

[0036] In the figure: 1-upper box body, 2-middle box body, 3-lower box body, 4-ash unloading valve, 5-support platform, 6-platform pillar, 7-scraper ash conveyor, 8-ash conveying pipe, 9-ash bin, 10-ash bin pillar, 11-ash truck, 12-blower, 13-chimney, 14-first lower material level meter, 15-first upper material level meter, 16-ash cleaning pipeline, 17-ash connection port, 18-Roots blower, 19-return air duct, 20-ash unloading bin, 21-second upper material level meter, 22-second lower material level meter, 23-unloading valve, 24-ash unloading bag. DETAILED DESCRIPTION

[0037] The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings, but is not limited thereto.

[0038] Embodiment 1:

[0039] like Figure 2 As shown, this embodiment provides a bag dust removal and cleaning system, including a dust collector, a cleaning pipeline 16, an ash discharge bin 20, a Roots blower 18, an ash discharge valve 4, a discharge valve 23 and a PLC;

[0040] The dust collector comprises an upper box body 1, a middle box body 2 and a lower box body 3 which are connected in sequence from top to bottom. A dust discharge valve 4 is arranged at the bottom end of the dust collector and is connected to a dust cleaning pipeline 16.

[0041] The head of the dust removal pipeline 16 is connected to the Roots blower 18, and the tail is connected to the dust discharge bin 20; the bottom end of the dust discharge bin 20 is connected to the discharge valve 23;

[0042] The Roots blower 18, the ash discharge valve 4 and the discharge valve 23 are all connected and controlled by PLC.

[0043] Specifically, the dust collector adopts the existing bag-type dust collector, and the dust-containing flue gas enters the lower box 3 through the pipeline. The dust with large particles and high specific gravity settles down due to the effect of gravity and falls into the lower box (also called the ash hopper). At the same time, under the impact of the timed high-pressure airflow of the bag back-blowing device, the bag shakes violently, causing the fine dust attached to the outer wall of the dust bag to fall off to the inside of the lower box. When the dust in the lower box accumulates to a certain extent, it is necessary to discharge the dust, that is, to clean the lower box. The traditional process is to use a scraper ash conveyor 7 to transport ash to the outside, but the scraper ash conveyor occupies a large area and needs to build a support platform 5. For sites with limited space, it is difficult to install the support platform 5 and the scraper ash conveyor 7.

[0044] This embodiment is a modification of the traditional bag dust collector solution. The fan is used to input high-pressure wind to blow the dust from the dust collector into the dust discharge bin. The entire process is intelligently controlled by PLC.

[0045] The bottom end port of the lower box 3 is welded to the dust cleaning pipeline 16, and a dust discharge valve 4 is installed at the bottom of the lower box to open or close the lower box to discharge dust into the dust cleaning pipeline. When the dust in the lower box begins to be discharged into the dust cleaning pipeline 16, the Roots blower 18 is turned on to input high-pressure wind into the dust cleaning pipeline 16 to blow the dust into the dust discharge bin 20.

[0046] The top of the ash unloading bin 20 is connected with a return air duct 19, which extends from the middle box 2 into the dust collector. The bottom of the return air duct 19 is located 20 cm above the bottom of the middle box 2. The return air duct is responsible for introducing the ash conveying air containing a small amount of dust discharged from the ash unloading bin 20 into the dust collector for purification.

[0047] The ash unloading bin 20 is located on one side of the dust collector and is fixedly connected to the side wall of the dust collector or installed on a supporting column on one side of the dust collector. The bottom end of the ash unloading bin 20 is 4.0m above the ground. The ash truck can be directly parked under the ash unloading bin, and the ash storage tank of the ash truck can be directly filled by opening the ash unloading valve.

[0048] A first upper material level meter 15 and a first lower material level meter 14 are arranged in the lower box body 3 , and both the first upper material level meter 15 and the first lower material level meter 14 are connected and controlled by PLC.

[0049] A second upper material level meter 21 and a second lower material level meter 22 are provided in the ash unloading bin 20 ; the second upper material level meter 21 and the second lower material level meter 22 are both connected and controlled by a PLC.

[0050] The setting of each lower level meter is to ensure that a certain thickness of ash accumulation layer is always retained inside the ash hopper and ash unloading bin. The ash accumulation layer blocks the discharge port of the ash hopper and ash unloading bin to prevent the leakage of smoke in each ash hopper during the unloading of the ash hopper and ash unloading bin. The volume of the ash unloading bin is 0.5-1.0 times the volume of the ash storage tank of the ash truck. The ash accumulation volume between the upper level meter and the lower level meter in the ash unloading bin should not exceed the capacity of the ash storage tank of the ash truck.

[0051] The technical solution of this embodiment uses the high-pressure wind generated by the Roots blower as the power source for conveying dust, and blows the dust into the dust discharge bin continuously, replacing the traditional scraper conveyor. There is no need to build a supporting platform, which also saves equipment expenses. At the same time, the material level meter is used to collect relevant position signals and transmit them to the PLC. A more intelligent PLC is used as the control center to intelligently control the fan and valve, realize intelligent dust discharge and unloading, and thus save a lot of equipment energy consumption.

[0052] Embodiment 2:

[0053] A bag dust removal and cleaning system, the structure of which is as described in Example 1, except that: an ash bag 24 is provided at the bottom of the ash unloading bin 20, and the ash bag is cylindrical. The ash bag can be tightly connected to the ash storage tank of the ash truck to prevent dust from escaping to the outside during the unloading process and polluting the atmosphere.

[0054] Embodiment 3:

[0055] A bag dust removal system, the structure of which is as described in Example 1, except that the bottom end of the return air duct 19 is located 40 cm above the bottom of the middle box, so as to prevent the return air duct from blowing up dust accumulated in the lower box again.

[0056] Embodiment 4:

[0057] A bag dust removal system, the structure of which is as described in Example 1, except that the bottom of the dust unloading bin 20 is 5.0 m from the ground. For different dust transport trucks, the dust unloading bin should be kept at a sufficient height to facilitate the dust transport trucks to dock at the loading point smoothly.

[0058] Embodiment 5:

[0059] A working method of the bag dust removal and cleaning system as described in Example 1, the specific working process includes the following steps:

[0060] 1) During the operation of the dust collector, when the first upper material level meter 15 detects that the dust in the lower box 3 has accumulated to a certain extent, the signal is transmitted to the PLC; the PLC controls the dust discharge valve 4 and the Roots blower 18 to open, and the dust in the lower box 3 enters the dust cleaning pipe 16 and is blown into the dust discharge bin 20 with the help of the high-pressure wind force input by the Roots blower 18, and the air is returned to the middle box 2 from the return air pipe 19;

[0061] 2) When the second loading level meter 21 detects that the dust in the ash unloading bin 20 has accumulated to the right position, it transmits a signal to the PLC; the PLC controls the unloading valve 23 to open, and fills the ash storage tank of the ash truck through the ash unloading bag 24;

[0062] 3) When the second material level meter 22 detects that the dust in the ash unloading bin 20 has fallen to the right position, it transmits a signal to the PLC; the PLC controls the unloading valve 23 to close, the ash transport truck leaves the loading point, and the next ash transport truck stops at the loading point;

[0063] 4) When the first lower material level meter 14 detects that the dust in the lower box 3 has fallen to the right position, the signal is transmitted to the PLC; the PLC controls the ash discharge valve 4 and the Roots blower 18 to close;

[0064] 5) Repeat steps 1)-4) to achieve continuous unloading.

[0065] The above description is only a specific implementation mode of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A bag dust removal and cleaning system, characterized in that: Including dust collector, dust cleaning pipeline, dust discharge bin, fan, dust discharge valve, discharge valve and PLC; The dust collector comprises an upper box body, a middle box body and a lower box body which are connected in sequence from top to bottom. A dust discharge valve is arranged at the bottom of the dust collector and is connected to a dust cleaning pipeline. The head of the dust removal pipeline is connected to the fan, and the tail is connected to the dust discharge bin; the bottom of the dust discharge bin is connected to the discharge valve; The fan, ash discharge valve and discharge valve are all connected and controlled by PLC.

2. The bag dust removal and cleaning system according to claim 1, characterized in that: The top of the dust unloading bin is connected with a return air duct, and the return air duct extends from the middle box into the dust collector.

3. The bag dust removal and cleaning system according to claim 2, characterized in that: The bottom end of the return air duct is located 20-40 cm above the bottom of the middle box body.

4. The bag dust removal and cleaning system according to claim 1, characterized in that: The dust discharge bin is located at one side of the dust collector and is fixedly connected to the side wall of the dust collector.

5. The bag dust removal and cleaning system according to claim 1, characterized in that: The bottom end of the ash unloading bin is at least 4.0m above the ground.

6. The bag dust removal and cleaning system according to claim 1, characterized in that: An ash unloading bag is arranged at the bottom end of the ash unloading bin.

7. The bag dust removal and cleaning system according to claim 1, characterized in that: The lower box body is provided with a first upper material level meter and a first lower material level meter, and both the first upper material level meter and the first lower material level meter are connected and controlled by PLC.

8. The bag dust removal and cleaning system according to claim 1, characterized in that: The ash unloading bin is provided with a second upper material level meter and a second lower material level meter; the second upper material level meter and the second lower material level meter are both connected and controlled by a PLC.

9. The bag dust removal and cleaning system according to claim 1, characterized in that: The blower adopts a Roots blower.

10. A working method of a bag dust removal and cleaning system according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) During the operation of the dust collector, when the first upper material level meter detects that the dust in the lower box has accumulated to a certain extent, it transmits the signal to the PLC; the PLC controls the dust discharge valve and the Roots blower to open, and the dust in the lower box enters the dust cleaning pipe and is blown into the dust discharge bin with the help of the high-pressure wind input by the Roots blower, and the air is returned to the middle box from the return air duct; 2) When the second loading level meter detects that the dust in the ash unloading bin has accumulated to the right position, it transmits the signal to the PLC; the PLC controls the unloading valve to open and fill the ash storage tank of the ash truck through the ash unloading bag; 3) When the second material level meter detects that the dust in the ash unloading bin has fallen to the right position, it transmits the signal to the PLC; the PLC controls the unloading valve to close, the ash truck leaves the loading point, and the next ash truck stops at the loading point; 4) When the first lower material level meter detects that the dust in the lower box has fallen to the right position, the signal is transmitted to the PLC; the PLC controls the ash discharge valve and the Roots blower to close; 5) Repeat steps 1)-4) to achieve continuous unloading.

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