Rotary spraying dust remover

Abstract

The utility model discloses a rotary spraying dust remover. The air purification device at least comprises a driving box body and an air purification chamber arranged below the driving box body, a pattern plate is arranged at the bottom of the air purification chamber; a lower gas conveying pipe is arranged in the driving box body downwards; the lower end of the lower gas delivery pipe downwards extends into the bottom of the gas purification chamber and is propped against the tubesheet; a rotary driving device is arranged in the driving box body and is used for driving the lower gas conveying pipe to rotate; a blowing pipe communicated with the gas conveying pipe is mounted at the lower end of the lower gas conveying pipe; and an on-line bag breaking detection and plugging device is mounted on the side wall of the lower gas conveying pipe. In the working process, the position of the damaged filter bag can be detected in real time, the ash leakage pattern plate is automatically blocked in a non-contact mode, and a large amount of manpower and material resources are saved.

Description

Technical Field

[0001] The utility model relates to a dust collector, in particular to a rotary jet dust collector. Background Technique

[0002] With the continuous promotion of the ultra-low emission transformation of industries such as steel and building materials by the state. Publication No.: CN210045015 discloses a top-in and bottom-out low-pressure rotary jet dust collector, which is widely used in the field of flue gas pollutant treatment due to its characteristics of large flue gas treatment capacity, low air leakage rate, good adaptability, simple operation and maintenance, high dust removal efficiency, and no secondary pollution.

[0003] Compared with the structure of the traditional row jet dust collector, the orifice plate holes of the rotary jet dust collector are distributed in concentric circles, and the jetting device is driven by a rotating mechanism to dynamically jet the filter bags. The jetting pressure is lower than that of the row jet dust collector (about 80-98 kPa), which can effectively avoid the condensation of the filter bags, improve the service life of the filter bags, and the filtration area and the treated air volume of a single chamber are larger than those of the row jet dust collector, with a lower air leakage rate and a higher dust removal efficiency. However, since there are more filter bags loaded in a single compartment, it is more difficult to detect the position of the damaged filter bags by traditional methods. Moreover, most of the flue gas treated by the rotary jet dust collector is high-temperature flue gas, and the steel plate used for the compartment partition is a good conductor of heat. When a filter bag is damaged, cutting off the inlet and outlet baffle doors of the compartment cannot prevent the heat flow from flowing in from the adjacent compartment, and personnel cannot enter the compartment to replace the damaged filter bag. Only when the dust collector is shut down as a whole, and after the compartment cools down and sufficient air is blown in, can the maintenance personnel enter. According to the latest environmental protection regulations, to ensure that the chimney dust emission does not exceed the standard, the main process equipment must be shut down after the dust collector is shut down, seriously delaying the production operation.

[0004] At present, the existing online detection methods for filter bag damage mainly include detecting filter bag damage based on the charge method. This method requires a metal induction probe to be arranged inside each filter bag and connected to the signal processing module through a signal transmission line. This method has the disadvantages of huge cost increase, complex space layout, affecting the filter bag cleaning effect, easy failure or misoperation of the probe, and inability to replace online, so it is difficult to be widely promoted and applied on a large scale.

[0005] At present, most of the existing technologies for plugging damaged filter bags adopt mechanical seals. The sealing cover is installed on the jetting pipe. During operation, the leaking orifice plate hole is pressed tightly by a spring, and the gap between the orifice plate and the sealing cover is sealed with rubber. This method has the disadvantages of insufficient pressing, inaccurate centering of the orifice plate, easy falling off of the sealing cover under the action of the pressure difference of the dust collector, and inapplicability to the rotary jet pipe, and inability to achieve plugging online. Therefore, it is difficult to meet the actual working conditions requirements of the dust collector during use.

[0006] Therefore, the research and development of a device and method for online detecting the damage condition of filter bags in each compartment and the position of the leaking orifice plate, and online treating the leaking orifice plate, has been put on the agenda. Summary of the Utility Model

[0007] In view of the above problems, the purpose of the present utility model is to provide a rotary jet dust collector.

[0008] To achieve the above purpose, the rotary jet dust collector of the present utility model at least includes: a driving box body and a clean gas chamber arranged below the driving box body; a perforated plate is arranged at the bottom of the clean gas chamber; a lower air delivery pipe is arranged downward in the driving box body; the lower end of the lower air delivery pipe extends downward into the bottom of the clean gas chamber and abuts against the perforated plate; a rotary driving device is arranged in the driving box body, and the rotary driving device is used to drive the lower air delivery pipe to rotate; a blowing pipe communicated with the air delivery pipe is installed at the lower end of the lower air delivery pipe; an on-line bag breakage detection and blocking device is installed on the side wall of the lower air delivery pipe.

[0009] Further, the on-line bag breakage detection and blocking device includes: a guide rail is connected to the side wall of the lower air delivery pipe; a controlled trolley is installed below the guide rail, and a trolley driving device is used to drive the controlled trolley to move along the guide rail;

[0010] A bag breakage detection device and a blocking device are installed on the controlled trolley.

[0011] Further, the blocking device includes a liquid spraying pipe corresponding to the perforated plate, and the liquid spraying pipe is connected to the liquid outlet of the blocking liquid storage tank; a solenoid valve is arranged on the liquid spraying pipe.

[0012] Further, the driving device is used to drive the lower air delivery pipe to rotate at a first speed or a second speed

[0013] Further, an air bag is arranged on the driving box body, and an upper air delivery pipe is arranged at the lower end of the air bag; the bottom of the upper air delivery pipe is inserted into the head of the lower air delivery pipe, and the gap is sealed with an oil seal.

[0014] Further, the rotary driving device includes: a rotary motor reducer assembly installed on the driving box body, a driving gear installed on the output shaft of the motor, and a first encoder installed at the end of the driving gear shaft. The driving gear and the outer ring of the slewing bearing form a gear transmission pair, and the inner ring of the slewing bearing is installed on the driving box body; the lower air delivery pipe is installed on the outer ring of the slewing bearing.

[0015] Further, there are multiple blowing pipes.

[0016] Further, the trolley driving device includes: a traveling motor installed at the base on the upper surface of the guide rail; a driving sprocket is installed on the output shaft of the traveling motor; a second encoder is installed at the end of the output shaft of the traveling motor; front and rear sprockets are installed at both ends of the guide rail, and a chain ring is sleeved on the front and rear sprockets; the traveling trolley runs on the guide rail and is connected by a chain.

[0017] To achieve the above object, the on-line detection and plugging method of the jet dust collector of the present utility model includes the following steps:

[0018] The rotary drive device drives the guide rail to rotate;

[0019] The traveling trolley drives the dust concentration meter to sequentially collect the dust of each filter bag hole on the flower plate;

[0020] Determine the position of the damaged filter bag with the largest value;

[0021] The traveling trolley acts to align the liquid spraying pipe with the center of the damaged filter bag;

[0022] The solenoid valve acts, and the high-pressure plugging liquid is sprayed into the filter bag at high speed, adhering to the filter cage and the inner wall of the filter bag, filling the flower plate hole. After half an hour, the plugging liquid solidifies and plugs the flower plate hole.

[0023] The beneficial effects of the present utility model are as follows:

[0024] 1) The present utility model can, under the condition of non-stop operation, monitor the damage condition of each compartment filter bag in real time and accurately determine the position of the damaged filter bag. The system is stable and reliable, simple to operate, and has a high degree of automation.

[0025] 2) One set of detection probes of the single set system of the present utility model can simultaneously monitor up to more than 2,000 filter bags. Compared with the conventional charge detection or laser detection system, it saves a large amount of investment and operation costs.

[0026] 3) The present utility model can automatically complete the plugging treatment of the damaged filter bag without contact under the condition of non-stop operation of the dust collector, completely solving the problems such as the need for long-term shutdown of the high-temperature flue gas dust collector and the difficulty of personnel entering the chamber for maintenance. The synchronization rate with the main process equipment reaches 100%, ensuring personnel safety. Ensuring the stable up-to-standard discharge of dust at the chimney outlet and protecting the environment.

[0027] 4) The real-time monitoring device and the on-line processing device of the present utility model can be used in combination or separately, with flexible configuration, more flexible and intelligent operation, and fully meeting the requirements of the dust collector use working conditions. Description of the Drawings

[0028] Figure 1 is the front view of the present utility model.

[0029] Figure 2 is Figure 1 the enlarged structural schematic diagram at I in.

[0030] Figure 3 is Figure 1 the schematic diagram in the A-A direction in.

[0031] Figure 4 is Figure 1Schematic diagram of the enlarged structure at II in the middle

[0032] Explanation of drawing numbers

[0033] 1: Gas storage tank; 2: Upper gas transmission pipe; 3: Rotary motor drive assembly; 4: Driving gear; 5: Encoder 1; 6: Dust collector top plate; 7: Support; 8: Tie rod; 9: Blowing pipe; 10: Nozzle; 11: Filter bag; 12: Flower plate; 13: Bearing; 14: Head sprocket; 15: Tensioning sprocket; 16: Liquid spraying pipe; 17: Solenoid valve; 18: Dust concentration detector; 19: Plugging liquid storage tank; 20: Guide rail; 21: Bumping head; 22: Tail sprocket; 23: Chain; 24: Walking trolley; 25: Walking motor assembly; 26: Lower gas transmission pipe; 27: Slewing bearing; 28: Driving box; 29: Blowing valve; 30: Encoder 2; 31: Driving sprocket. Specific implementation mode

[0034] The following further describes the present utility model with reference to the accompanying drawings of the specification.

[0035] Embodiment 1

[0036] This embodiment provides a device for detecting and online processing of broken bags in a rotary jet dust collector, which is applied to a 330-square-meter sintering machine flue gas circulating fluidized bed desulfurization rotary jet dust collector in a certain steel plant. The dimensions of the dust collector (length × width × height) are: 38.7 m × 23.4 m × 31.8 m. It is arranged in a double row, with 6 chambers and 12 units. Two sets of broken bag detection and online processing devices are set in each chamber. As Figure 1 shown is the layout of a single unit, including an air bag system, a rotary blowing and position detection system, a trolley walking system, and a flower plate and filter cage filter bag system.

[0037] The air bag system is successively installed with a blowing valve, an air bag 1, an upper gas transmission pipe 2, a driving box 28, and a support 7 from top to bottom. The support is installed on the top plate at the center of the clean gas chamber. The volume of the air bag is 4m 3 , the working pressure of the air bag is 98 KPa, and the size of the pulse valve is 14 inches.

[0038] The rotary blowing and position detection system includes a rotary motor reducer assembly 3 installed on the driving box, a driving gear 4 installed on the output shaft of the motor, and an encoder 5 installed at the end of the driving gear shaft. The driving gear and the outer ring of the slewing bearing 27 form a gear transmission pair, and the inner ring of the slewing bearing is installed on the driving box 28. The rotary motor is a three-phase asynchronous variable-frequency motor, the reducer is of the cycloidal pinwheel type, the slewing bearing is of the external tooth meshing type of cylindrical gear, and the encoder is a single-turn absolute rotary encoder.

[0039] Rotary spraying and position detection system, the lower air pipe 26 is installed at the center of the slewing support and fixed to the outer ring of the slewing support, the bottom of the upper air pipe is inserted into the head of the lower air pipe, and the gap is sealed with an oil seal. The spray pipe 9 is bolted to the bottom of the lower air pipe 26, the end of the lower air pipe is inserted into the bearing, and the bearing is fixed in the center of the flower plate 12. The speed of the rotary spray device is about 1 turn / minute when running at high speed, and about 0.6 turns / minute when running at low speed.

[0040] The trolley travel system, the guide rail 20 is installed at the bottom of the lower air pipe, and is arranged at an angle of 90° with the spray pipe, with a total of three spray pipes and one set of guide rails. The travel motor assembly 25 is installed at the base on the upper surface of the guide rail, the drive sprocket is installed on the output shaft of the travel motor assembly, and the encoder 2 30 is installed at the end of the output shaft. The front and rear sprockets 22 and the impact head 21 are installed at both ends of the guide rail, and the travel trolley 24 runs on the guide rail. The drive sprocket, the guide sprocket, the front and rear sprockets and the travel trolley are connected by the chain 23. The guide rail 20 and the lower air pipe 26 are hinged by the pull rod 8. The travel motor assembly, the rotary motor adopts a three-phase asynchronous industrial frequency motor, the reducer is a cycloidal pinwheel type, the trolley travel speed is about 0.12m / s, and the encoder 2 30 adopts a multi-turn absolute rotary encoder. The dust concentration detector 18 is installed at the bottom of the trolley, the plugging liquid storage tank 19 is installed inside the trolley, and the outlet is connected to the solenoid valve 17 and the high-pressure spray pipe 16. The plugging liquid adopts a polyurethane foaming agent.

[0041] Flower plate and filter cage filter bag system. The flower plate has elliptical through holes, and the flower plate holes are arranged in concentric circles at equal intervals. The filter bag (the commonly used one is Φ127 filter bag) is an elliptical cloth bag, and the filter cage is composed of assembled multi-section filter cages, which are about 6 to 8.5 meters long after assembly. When the whole system is completed, the number of filter bag holes on the flower plate and the position of each filter bag hole are fixed, so the trolley travel system can scan and block the flower plate circle by circle and hole by hole.

[0042] In order to facilitate detection and blocking, the dust concentration detector and the nozzle of the high-pressure liquid spray pipe are both arranged in the direction of the guide rail. In this way, since the distance H between the dust concentration detector and the nozzle of the high-pressure liquid spray pipe is fixed, when the dust concentration detector detects that the dust concentration exceeds the standard, the trolley can move another distance H to align the nozzle of the high-pressure liquid spray pipe with the center position of the flower plate hole.

[0043] Example 2

[0044] This embodiment provides a method for detecting and processing bag breakage in a rotary jet dust collector, which is applied to a 330 square meter sintering machine flue gas circulating fluidized bed desulfurization rotary jet dust collector in a steel plant. The computer program is divided into a normal monitoring operation mode and a bag breakage online detection and processing mode.

[0045] During normal monitoring mode operation, the computer controls according to the differential pressure at the inlet and outlet of the dust collector or uses sequential control, sets the pulse interval time and pulse duration, the rotary motor runs at high speed to drive the pulse device to rotate, and the rotary pulse device automatically blows and cleans the filter bags. At the same time, Encoder 1 works to monitor the rotation angle of the guide rail in real time. The walking trolley starts from the innermost concentric circle position, and the dust concentration meter detects the damage condition of a circle of filter bags in real time. If the dust concentration does not exceed the set value, it is considered that there is no damage to the filter bags. After rotating a circle, the walking trolley accurately runs to the next concentric circle through the control of Encoder 2, and repeats the previous process until all the filter bags in the concentric circles are detected. Then the walking trolley retreats to the first circle of concentric circles and continues the above process. The online detection of broken bags does not affect the normal blowing and cleaning of the filter bags during operation.

[0046] When the dust concentration meter 18 detects that the concentration exceeds the set value, the system alarms and enters the online detection and treatment mode for broken bags. The rotary motor is frequency-converted and adjusted to run at low speed (the walking trolley does not move). The dust concentration meter collects the dust concentration of the filter bags in this concentric circle in real time, and the position with the highest dust concentration is the position of the broken filter bag. After the computer determines the position of the broken filter bag, it closes the inlet and outlet baffle doors of the dust collector compartment. The walking trolley moves to drive the dust concentration meter 18 away so that the liquid spraying pipe 16 is centered on the center of the broken filter bag. The solenoid valve 17 acts, and the high-pressure plugging liquid is sprayed into the filter bag at high speed and adheres to the filter cage and the inner wall of the filter bag, filling the hole of the flower plate. After half an hour, the plugging liquid solidifies to plug the hole of the flower plate. The system switches to the normal monitoring mode, opens the inlet and outlet baffle doors of this compartment, and this compartment is put into operation.

[0047] The above is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A rotary jet dust collector, characterized in that: At least: A driving box body and a clean air chamber arranged below the driving box body; a flower plate is arranged at the bottom of the clean air chamber; a lower air pipe is arranged downwardly in the driving box body; the lower end of the lower air pipe extends downward to the bottom of the clean air chamber and abuts against the flower plate; a rotating drive device is arranged in the driving box body, and the rotating drive device is used to drive the lower air pipe to rotate; a blowing pipe connected to the lower air pipe is installed at the lower end of the lower air pipe; an online bag breaking detection and blocking device is installed on the side wall of the lower air pipe.

2. The rotary spray dust collector according to claim 1, characterized in that: The online bag breakage detection and blocking device comprises: a guide rail is connected to the side wall of the lower gas transmission pipe; a controlled trolley is installed below the guide rail, and a trolley driving device is used to drive the controlled trolley to move along the guide rail; A bag breakage detection device and a blocking device are installed on the controlled trolley.

3. The rotary spray dust collector according to claim 1, characterized in that: The plugging device comprises a liquid spraying pipe arranged corresponding to the flower plate, the liquid spraying pipe is connected with the liquid outlet of the plugging liquid storage tank; and a solenoid valve is arranged on the liquid spraying pipe.

4. The rotary spray dust collector according to claim 1, characterized in that: The rotary drive device is used to drive the lower air delivery pipe to rotate at a first rotation speed or a second rotation speed.

5. The rotary spray dust collector according to claim 1, characterized in that: An air bag is arranged on the driving box body, and an upper air pipe is arranged at the lower end of the air bag; the bottom of the upper air pipe is inserted into the head of the lower air pipe, and the gap is sealed by an oil seal.

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