Cloth bag dust removal and ash removal system

Abstract

The utility model relates to a cloth bag dust removal and ash removal system which comprises a dust remover, an ash removal pipeline, an ash discharge bin, a fan, an ash discharge valve, a discharge valve and a PLC (Programmable Logic Controller), 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 utility model, 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 collection and discharge functions of the dust removal system are realized by adopting a PLC (Programmable Logic Controller), the automatic and intelligent operation level of a production process is greatly improved, and the high-quality development of industrial production is promoted.

Description

Technical Field

[0001] This utility model relates to a bag filter dust removal system, and particularly to an industrial flue gas dust removal process, belonging to the field of industrial flue gas treatment technology. Background Technology

[0002] A baghouse dust collector is a dry dust filtration device. It is suitable for collecting fine, dry, non-fibrous dust. The filter bags are made of woven filter cloth or non-woven felt, utilizing the filtration effect of the fibrous fabric to filter dust-laden gas. When the dust-laden gas enters the baghouse dust collector, larger, heavier dust particles settle down due to gravity and fall into the ash hopper. The gas containing finer dust particles is purified as it passes through the filter media, as the dust is trapped.

[0003] Chinese patent document CN219441019U discloses a novel baghouse dust collector. This dust collector, by setting up fixed support plates and movable baffles, allows for efficient cleaning of the dust collection chamber. When cleaning is required, a push-pull cylinder is activated, pulling the movable baffle to open it. At this point, the chamber and ash hopper are connected, while the diversion pipe is not connected to the chamber. Then, a cleaning fan and a ventilation fan are activated. The ventilation fan draws external air into the first air chamber, which is then compressed by the cleaning fan and introduced into the telescopic pipe through the inlet pipe. The air then passes through multiple sets of blowpipes to blow through the diamond-shaped filter bags, cleaning the dust covering the outer surface of the bags. The cleaned dust falls into the ash hopper and is then discharged through the ash discharge valve. During cleaning, external flue gas cannot enter the chamber, thus thoroughly cleaning the dust collection chamber.

[0004] like Figure 1 As shown, the traditional baghouse dust collector mainly consists of an upper housing, a middle housing, a lower housing (ash hopper), a dust removal system, and an ash discharge system. The ash discharge system includes an ash discharge valve and a scraper conveyor. The ash discharge valve is installed at the bottom of the lower housing (ash hopper) and is vertically connected to the scraper conveyor. Under manual control, the ash discharge valve automatically discharges ash to the scraper conveyor. The continuously operating scraper conveyor transports the dust to the ash silo in a timely manner. Then, the ash silo is manually controlled at timed intervals to unload the dust onto ash transport trucks, which then transport the dust for other uses.

[0005] In the aforementioned traditional process system, the scraper conveyor is placed on a support platform, which is a reinforced concrete platform supported by multiple platform pillars. Sufficient height distance is maintained between the platform and the ground to facilitate the reasonable placement of the ash silo. The support platform occupies a large vertical space. The ash silo is an independent facility system, located on one side of the platform. It is large in size and occupies a large ground area and above-ground space.

[0006] In existing, cramped industrial production sites where space is extremely limited, especially in the renovation projects of older industrial facilities, the limited space around the project often leaves no room for bulky ash silos, thus hindering the construction of baghouse dust collection systems. Therefore, further modifying and optimizing existing baghouse dust collection systems to simplify the production process and reduce the size of the equipment has become the main problem that this utility model urgently needs to solve. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a bag filter dust removal system. This system adopts a completely new structural design, which significantly saves production space and utilizes PLC for intelligent control, enabling automatic unloading, dust removal, and dust transportation, thereby greatly improving dust removal efficiency.

[0008] The technical solution of this utility model is as follows:

[0009] A bag filter dust removal system includes a dust collector, a dust removal pipe, an ash discharge hopper, a fan, an ash discharge valve, a discharge valve, and a PLC;

[0010] The dust collector includes an upper chamber, a middle chamber, and a lower chamber connected in sequence from top to bottom. The bottom of the dust collector is equipped with an ash discharge valve and connected to the ash cleaning pipe.

[0011] The head of the ash removal pipe is connected to the fan, and the tail is connected to the ash discharge hopper; the bottom of the ash discharge hopper is connected to the discharge valve.

[0012] The blower, ash discharge valve, and material discharge valve are all controlled by a PLC.

[0013] Preferably, the top of the ash unloading hopper is connected to a return air pipe, which extends from the middle box into the dust collector.

[0014] Preferably, the bottom end of the return air duct is located 20-40cm above the bottom of the middle box.

[0015] Preferably, the ash unloading hopper is located on one side of the dust collector and is fixedly connected to the side wall of the dust collector.

[0016] Preferably, the bottom of the ash unloading hopper is at least 4.0m above the ground. The advantage of this design is that ash trucks can park directly below the ash unloading hopper, and the ash unloading valve can be opened to directly fill the ash storage tank of the ash truck.

[0017] Preferably, an ash discharge bag is provided at the bottom of the ash discharge hopper. The advantage of this design is that the ash discharge bag can be tightly connected to the ash storage tank opening of the ash transport truck, preventing dust from escaping during the unloading process and polluting the atmosphere.

[0018] Preferably, the lower housing is equipped with a first loading level gauge and a first unloading level gauge, both of which are controlled by a PLC.

[0019] Preferably, the ash unloading hopper is equipped with a second loading level gauge and a second unloading level gauge; both the second loading level gauge and the second unloading level gauge are connected and controlled by a PLC.

[0020] Preferably, the blower is a Roots blower.

[0021] Preferably, the volume of the ash unloading hopper 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 amount of ash accumulated between the upper and lower level gauges in the ash unloading hopper should not exceed the capacity of the ash storage tank of the ash transport truck.

[0022] Technical features and beneficial effects of this utility model:

[0023] 1. This utility model simplifies the structure of the bag filter dust collection system, eliminates the scraper conveyor ash discharge system, and saves the scraper conveyor support platform, thereby significantly reducing the construction cost of the bag filter dust collection system.

[0024] 2. This utility model further simplifies the production process, reduces the inspection and maintenance costs of system equipment and production operation costs, and improves the efficiency of ash removal operations.

[0025] 3. This utility model significantly reduces the volume and floor space of the ash unloading silo equipment, enabling the bag filter dust collection system to be rationally constructed in industrial production sites with limited space.

[0026] 4. This utility model uses PLC to realize the intelligent dust collection and discharge function of the dust removal system, which greatly improves the automation and intelligent operation level of the production process and promotes the high-quality development of industrial production. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the traditional process flow;

[0028] Figure 2 This is a schematic diagram of the process flow of this utility model;

[0029] In the diagram: 1-Upper box, 2-Middle box, 3-Lower box, 4-Ash discharge valve, 5-Support platform, 6-Platform support column, 7-Scraper conveyor, 8-Ash conveying pipe, 9-Ash silo, 10-Ash silo support column, 11-Ash truck, 12-Blower, 13-Chimney, 14-First discharge level gauge, 15-First loading level gauge, 16-Ash cleaning pipe, 17-Ash inlet, 18-Roots blower, 19-Return air pipe, 20-Ash discharge silo, 21-Second loading level gauge, 22-Second discharge level gauge, 23-Discharge valve, 24-Ash discharge bag. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0031] Example 1:

[0032] like Figure 2 As shown, this embodiment provides a bag filter dust removal system, including a dust collector, a dust removal pipe 16, an ash discharge hopper 20, a Roots blower 18, an ash discharge valve 4, a discharge valve 23, and a PLC;

[0033] The dust collector includes an upper chamber 1, a middle chamber 2 and a lower chamber 3 connected from top to bottom. The bottom of the dust collector is equipped with an ash discharge valve 4 and connected to the ash cleaning pipe 16.

[0034] The head of the ash removal pipe 16 is connected to the Roots blower 18, and the tail is connected to the ash discharge hopper 20; the bottom of the ash discharge hopper 20 is connected to the discharge valve 23.

[0035] The Roots blower 18, the ash discharge valve 4, and the discharge valve 23 are all controlled by a PLC.

[0036] Specifically, the dust collector uses an existing baghouse dust collector. Dust-laden flue gas enters the lower chamber 3 through a pipe. Larger, heavier dust particles settle due to gravity and fall into the lower chamber (also called the ash hopper). Simultaneously, under the timed high-pressure airflow of the baghouse back-blowing device, the filter bags vibrate violently, causing fine dust adhering to the outer wall of the filter bags to fall into the lower chamber. When the dust accumulates to a certain level in the lower chamber, ash removal, i.e., cleaning of the lower chamber, is required. Traditionally, a scraper conveyor 7 is used to transport the ash outwards. However, scraper conveyors occupy a large area and require a support platform 5. For sites with limited space, it is difficult to install the support platform 5 and the scraper conveyor 7.

[0037] This embodiment is a modification of the traditional bag filter solution. It uses a fan to input high-pressure air to blow dust from the dust collector into the ash discharge hopper. The whole process is intelligently controlled by a PLC.

[0038] The bottom end of the lower housing 3 is welded to the dust removal pipe 16. A ash discharge valve 4 is installed at the bottom of the lower housing to open or close the lower housing to discharge ash into the dust removal pipe. When the dust in the lower housing begins to be discharged into the dust removal pipe 16, the Roots blower 18 is turned on, inputting high-pressure air into the dust removal pipe 16 to blow the dust into the ash discharge bin 20.

[0039] The top of the ash discharge hopper 20 is connected to a return air duct 19, which extends from the middle box 2 into the dust collector. The bottom end of the return air duct 19 is located 20cm 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 discharge hopper 20 into the dust collector for purification.

[0040] The ash unloading hopper 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 of the ash unloading hopper 20 is 4.0m above the ground. Ash trucks can park directly under the ash unloading hopper, and the ash unloading valve can be opened to directly fill the ash storage tank of the ash truck.

[0041] The lower housing 3 is equipped with a first loading level gauge 15 and a first unloading level gauge 14, both of which are controlled by a PLC.

[0042] The ash unloading hopper 20 is equipped with a second loading level gauge 21 and a second unloading level gauge 22; both the second loading level gauge 21 and the second unloading level gauge 22 are connected and controlled by a PLC.

[0043] The purpose of installing each level gauge is to ensure that a certain thickness of ash layer is always maintained inside the ash hopper and ash discharge bin. This ash layer acts as a seal for the discharge ports of the ash hopper and ash discharge bin, preventing leakage of flue gas from the ash hopper during unloading. The volume of the ash discharge bin is 0.5-1.0 times the volume of the ash storage tank of the ash transport truck. The amount of ash accumulated between the upper and lower level gauges in the ash discharge bin should preferably not exceed the capacity of the ash storage tank of the ash transport truck.

[0044] This embodiment utilizes the high-pressure airflow generated by a Roots blower as the power source for conveying dust, continuously blowing dust into the ash discharge hopper, replacing the traditional scraper conveyor. This eliminates the need for a supporting platform and saves on equipment costs. Simultaneously, a level gauge collects relevant position signals and transmits them to a PLC. Using a more intelligent PLC as the control center, the blower and valves are intelligently controlled, achieving intelligent ash discharge and unloading, thereby saving significant energy consumption.

[0045] Example 2:

[0046] A baghouse dust collection and cleaning system is provided, with the structure described in Example 1, except that: a dust discharge bag 24 is provided at the bottom of the dust discharge hopper 20, and the dust discharge bag is cylindrical. The dust discharge bag can be tightly connected to the opening of the dust storage tank of the dust truck to prevent dust from escaping during the unloading process and polluting the atmosphere.

[0047] Example 3:

[0048] A baghouse dust collection and cleaning system, with the structure described in Example 1, differs in that the bottom end of the return air duct 19 is located 40cm above the bottom of the middle chamber. This prevents the return air duct from blowing up the dust already accumulated in the lower chamber again.

[0049] Example 4:

[0050] A baghouse dust collection and cleaning system, with the structure described in Example 1, differs in that the bottom of the ash unloading hopper 20 is 5.0m above the ground. The ash unloading hopper must maintain sufficient height for different ash-carrying trucks to facilitate smooth parking at the loading point.

[0051] Example 5:

[0052] A working method of the bag filter dust removal system as described in Example 1 includes the following steps:

[0053] 1) During the operation of the dust collector, when the first loading level gauge 15 detects that the dust in the lower box 3 has accumulated to the required level, it transmits the signal to the PLC; the PLC controls the ash discharge valve 4 and the Roots blower 18 to open, the dust in the lower box 3 enters the ash cleaning pipe 16 and is blown into the ash discharge hopper 20 by the high pressure air force input by the Roots blower 18, and the air is returned to the middle box 2 from the return air pipe 19;

[0054] 2) When the second loading level gauge 21 detects that the dust in the ash unloading hopper 20 has accumulated to the required level, it transmits the 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.

[0055] 3) When the second material level gauge 22 detects that the dust in the ash unloading hopper 20 has fallen to the required level, it transmits a signal to the PLC; the PLC controls the unloading valve 23 to close, the ash truck drives away from the loading point, and the next ash truck stops at the loading point;

[0056] 4) When the first discharge level gauge 14 detects that the dust in the lower box 3 has fallen to the designated position, it transmits a signal to the PLC; the PLC controls the ash discharge valve 4 and the Roots blower 18 to close.

[0057] 5) Repeat steps 1)-4) to achieve continuous unloading.

[0058] The above description is only a specific embodiment of this utility model. The protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A bag filter dust removal system, characterized in that, Includes dust collector, ash removal pipe, ash unloading hopper, fan, ash unloading valve, unloading valve and PLC; The dust collector includes an upper chamber, a middle chamber, and a lower chamber connected in sequence from top to bottom. The bottom of the dust collector is equipped with an ash discharge valve and connected to the ash cleaning pipe. The head of the ash removal pipe is connected to the fan, and the tail is connected to the ash discharge hopper; the bottom of the ash discharge hopper is connected to the discharge valve. The blower, ash discharge valve, and material discharge valve are all controlled by a PLC.

2. The bag filter dust removal system as described in claim 1, characterized in that, The top of the ash unloading hopper is connected to a return air pipe, which extends from the middle box into the dust collector.

3. The bag filter dust removal system as described in claim 2, characterized in that, The bottom end of the return air duct is located 20-40cm above the bottom of the middle box.

4. The bag filter dust removal system as described in claim 1, characterized in that, The ash unloading hopper is located on one side of the dust collector and is fixedly connected to the side wall of the dust collector.

5. The bag filter dust removal system as described in claim 1, characterized in that, The bottom of the ash unloading hopper is at least 4.0m above the ground.

6. The bag filter dust removal system as described in claim 1, characterized in that, The bottom of the ash unloading hopper is equipped with an ash unloading cloth bag.

7. The bag filter dust removal system as described in claim 1, characterized in that, The lower chamber is equipped with a first loading level gauge and a first unloading level gauge, both of which are controlled by a PLC.

8. The bag filter dust removal system as described in claim 1, characterized in that, The ash unloading hopper is equipped with a second loading level gauge and a second unloading level gauge; both the second loading level gauge and the second unloading level gauge are connected and controlled by a PLC.

9. The bag filter dust removal system as described in claim 1, characterized in that, The blower is a Roots blower.

Images