A viewing device for initial treatment of filter bags for online replacement

Abstract

The utility model relates to a kind of observation devices for initial treatment of online replacement filter bag, including observation cylinder, one end of observation cylinder is equipped with eyepiece, the other end is connected with the ash bucket shell of cloth bag dust catcher and is communicated with ash bucket interior, the middle part of observation cylinder is equipped with a by-passing cleaning pipe, cleaning pipe one end is communicated with observation cylinder, the other end is connected to compressed air source, valve is equipped on cleaning pipe;The utility model is convenient for real-time observation the ash deposition condition of filter bag in bag chamber when ash deposition after online replacement new filter bag, to judge whether ash deposition reaches requirement, beneficial to improve the filterability of filter bag.

Description

Technical Field

[0001] This utility model relates to the field of copper smelting production technology, specifically an observation device for initial treatment of online filter bag replacement. Background Technology

[0002] The particulate matter concentration in the flue gas generated during the smelting of scrap copper in a vertical shaft furnace exceeds emission standards. Currently, baghouse dust collectors are generally used to purify the flue gas. However, in actual production, the filter bags of these dust collectors frequently become damaged. After damage, the particulate matter concentration at the flue gas outlet increases and may even exceed the standard. If the baghouse dust collector is shut down and the filter bags are replaced offline, the vertical shaft furnace must also be shut down, resulting in significant economic losses. Therefore, baghouse dust collectors adopt a multi-baghouse design, such as... Figure 4 , Figure 5 As shown, to achieve online filter bag replacement, the specific online filter bag replacement method is as follows: After a filter bag is found to be damaged, both the vertical shaft furnace and the bag filter continue to operate. The lifting valve of the bag chamber containing the damaged filter bag is closed to shut off its flue gas outlet, while other bag chambers continue to operate normally. The cover plate of the upper box of the bag chamber containing the damaged filter bag is manually opened, the damaged old filter bag is removed from the upper box, a new filter bag is replaced, and then the bag chamber is put back into operation.

[0003] While the aforementioned online filter bag replacement method avoids furnace shutdowns and ensures normal production, the following problems exist in practical application: After replacing the filter bags, the hourly average concentration of particulate matter at the flue gas outlet increases significantly compared to the normal operation period before the filter bags were damaged. Furthermore, the more filter bags replaced and the higher the replacement ratio, the greater the increase in the average particulate matter concentration at the flue gas outlet. Frequent and widespread exceedances of minute particulate matter values ​​sometimes even force an emergency shutdown of the vertical furnace to avoid environmental penalties for exceeding hourly particulate matter standards. This adversely affects the furnace's safety and production safety, causing significant economic losses and contradicting the original intention of online filter bag replacement to achieve uninterrupted furnace operation. Summary of the Invention

[0004] To address the technical problem of low dust removal efficiency in the initial stage of use of newly replaced filter bags during online replacement, this utility model provides an observation device for the initial treatment of filter bags during online replacement.

[0005] The specific solution of this utility model is as follows: An observation device for the initial treatment of online filter bag replacement includes an observation cylinder, one end of which is equipped with an eyepiece, and the other end is connected to the ash hopper shell of the bag dust collector and communicates with the inside of the ash hopper. A bypass cleaning pipe is provided in the middle of the observation cylinder, one end of which is connected to the observation cylinder and the other end is connected to a compressed air source. A valve is installed on the cleaning pipe.

[0006] Furthermore, the observation tube includes a base tube and an eyepiece mounting tube. One end of the base tube is connected to the ash hopper shell, and the base tube and the eyepiece mounting tube are connected by a flange. The cleaning tube is installed on the eyepiece mounting tube, and a protective valve is installed on the eyepiece mounting tube between the flange and the cleaning tube.

[0007] Furthermore, the diameter of the eyepiece mounting tube is smaller than that of the base tube, and a tapered connecting tube is provided at the end of the eyepiece mounting tube facing the base tube.

[0008] Furthermore, the base tube has a gate at one end facing the ash hopper, and an insert plate is installed at the gate. The insert plate is used to open or close the communication hole between the observation tube and the ash hopper.

[0009] Furthermore, the protective valve is a butterfly valve.

[0010] Compared with the prior art, this utility model has the following beneficial effects: 1. When replacing new filter bags online, it is convenient to observe the dust accumulation of filter bags inside the baghouse in real time, so as to determine whether the dust accumulation meets the requirements, which is conducive to improving the filtration performance of filter bags; 2. During the daily operation of bag dust collectors, this utility model can also be used to monitor the inside of bag dust collectors. If dust accumulation is found, the dust discharge force can be increased; if agglomeration is found, the vibration intensity can be increased in time; if individual filter bags are found to be damaged, they can be replaced online immediately to prevent the damage from spreading to other filter bags, avoid the risk of excessive particulate matter at the flue gas outlet, and save on filter bag replacement costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the observation device and ash spraying device of this utility model;

[0012] Figure 2 yes Figure 1 AA section view;

[0013] Figure 3 yes Figure 1 Enlarged view of point V;

[0014] Figure 4 This is a structural schematic diagram of an existing bag filter dust collector;

[0015] Figure 5 yes Figure 4 Side view;

[0016] In the diagram: 1. Bag chamber; 2. Filter bag; 3. Upper housing; 4. Lifting valve; 5. Ash hopper; 6. Observation device; 61. Base tube; 62. Insert plate; 63. Flange; 64. Protective valve; 65. Eyepiece mounting tube; 66. Eyepiece; 67. Cleaning tube; 68. Manual valve; 7. Ash spraying device; 71. Air inlet pipe; 72. Circular pipe; 73. Spray pipe. Detailed Implementation

[0017] See Figure 1-3This embodiment provides a method for initial treatment of filter bags during online replacement. Four observation ports are provided at the ash hopper 5 of the bag chamber 1, and each observation port is equipped with an observation device 6. The observation device 6 is used to observe the filter bags 2 inside the bag chamber 1. The observation device 6 includes an observation cylinder with an eyepiece 66 mounted on its outer end. The inner end of the observation cylinder is connected to the shell of the ash hopper 5. A cleaning pipe 67 is provided in the middle of the observation cylinder, with one end connected to the observation cylinder and the other end connected to a compressed air source. The observation cylinder includes a base tube 61 and an eyepiece. The mounting tube 65 and the base tube 61 are connected to the eyepiece mounting tube 65 via a flange 63. The cleaning tube 67 is mounted on the eyepiece mounting tube 65, and a protective valve 64 is installed on the eyepiece mounting tube 65 between the flange 63 and the cleaning tube 67. The diameter of the eyepiece mounting tube 65 is smaller than that of the base tube 61, and a tapered connecting tube is provided at the end of the eyepiece mounting tube 65 facing the base tube 61. A gate is provided at the end of the base tube 61 facing the ash hopper 5, and a slide plate 62 is installed at the gate. The slide plate 62 is used to close or open the observation port of the ash hopper 5. In this embodiment, the protective valve 64 is a manual butterfly valve. When the butterfly valve is fully open, the valve plate plane is parallel to the axis of the eyepiece mounting tube 65, and at this time, the line of sight of the eyepiece 66 is basically unobstructed by the valve. The outer side of the ash hopper 5 is also provided with an ash spraying device 7. The ash spraying device 7 includes a ring pipe 72. An air inlet pipe 71 is connected to one side of the ring pipe 72. Eight spray pipes 73 are evenly arranged on the ring pipe 72 and extend into the ash hopper 5. Each spray pipe 73 is arranged towards the soot in the ash hopper 5. The spray pipes 73 are inclined downward at 30°-60° and point towards the center line of the ash hopper 5.The replacement of filter bag 2 is carried out by the above-mentioned observation device 6 and ash spraying device 7. The specific method includes the following steps: S1, before replacing the new filter bag 2, a certain amount of soot is retained in the ash hopper 5 of the bag chamber 1 where the damaged filter bag 2 is located; S2, the bag chamber 1 is disconnected, and the back-blowing cleaning of the bag chamber 1 is closed at the same time, and then a new filter bag 2 is replaced; S3, compressed gas is introduced into the air inlet pipe 71 of the ash spraying device 7 to stir the soot in the ash hopper 5, so that the soot rises and adheres to the surface of the filter bag 2, and the ash adhesion on the surface of the filter bag 2 is observed through the observation device 6; during the observation process, the protective valve 64 is opened, and the insert plate 62 is pulled out. The ash accumulation at the observation port is checked through the eyepiece 66 to confirm that the eyepiece 66 does not obstruct the line of sight to the bag chamber 1; otherwise, the eyepiece 66 is unscrewed, the manual valve 68 of the cleaning pipe 67 is opened, and compressed gas is introduced into the eyepiece mounting pipe 65 to blow away the ash. If necessary, the flange 63 is disassembled and the soot at the port of the base pipe 61 is cleaned with a steel rod. Clumping is prevented to ensure that the filter bag 2 inside the bag chamber 1 can be observed through eyepiece 66; S4, when the original color of the filter bag 2 can no longer be observed on the lower surface of the new filter bag 2, the dust spraying is stopped, and then the cover plate is opened from the top of the upper box 3 of the bag chamber 1. Then, the new filter bag 2 is lifted up one end distance to check the dust accumulation on the upper surface of the filter bag 2. If the original color of the filter bag 2 can be seen on the upper part, the new filter bag 2 is reset and steps S3 and S4 are repeated until the original color of the filter bag 2 can no longer be seen on the upper surface of the new filter bag 2. S5. Install filter bag 2 and close the cover of upper housing 3; S6. In manual mode, start the back-flushing cleaning of bag chamber 1 where the new filter bag 2 is located, back-flushing several times, and then open the lifting valve 4 to put bag chamber 1 into operation; S7. Observe the operating resistance of the bag filter and compare it with the level before the filter bag 2 was damaged: If the operating resistance is greater than the normal level before the filter bag 2 was damaged, start the back-flushing cleaning of bag chamber 1 where the new filter bag 2 is located, and use the automatic mode to make the operating resistance of the bag filter return to the level of normal operation. If the operating resistance is less than the normal level before the filter bag 2 was damaged, continue to stop the back-flushing cleaning until the operating resistance value increases to the normal level before the filter bag 2 was damaged, then start the back-flushing cleaning again, and use the automatic mode to make the operating resistance of the bag filter return to the level of normal operation. In this embodiment, after replacing 36 filter bags 2 in the same bag chamber 1 online, all new filter bags 2 were simultaneously dusted, and the dusting was completed in 25 minutes. Then bag chamber 1 was put back into operation. After the new filter bag 2 was put into use, the hourly average particulate matter concentration at the flue gas outlet was 1.7 mg / Nm3 to 4.3 mg / Nm3, and the minute value ranged from 0.5 mg / Nm3 to 6.5 mg / Nm3, which is better than the normal operating level and fully meets the environmental protection requirements.

Claims

1. An observation device for initial treatment of online filter bag replacement, characterized in that: It includes an observation tube, one end of which is equipped with an eyepiece, and the other end is connected to the ash hopper shell of the bag filter and communicates with the inside of the ash hopper. A bypass cleaning pipe is provided in the middle of the observation tube, one end of which is connected to the observation tube and the other end is connected to a compressed air source. A valve is installed on the cleaning pipe.

2. The observation device for initial treatment of online filter bag replacement according to claim 1, characterized in that: The observation tube includes a base tube and an eyepiece mounting tube. One end of the base tube is connected to the ash hopper shell, and the base tube and the eyepiece mounting tube are connected by a flange. The cleaning tube is installed on the eyepiece mounting tube, and a protective valve is installed on the eyepiece mounting tube between the flange and the cleaning tube.

3. The observation device for initial treatment of online filter bag replacement according to claim 2, characterized in that: The diameter of the eyepiece mounting tube is smaller than that of the base tube, and a tapered connecting tube is provided at the end of the eyepiece mounting tube facing the base tube.

4. An observation device for initial treatment of online filter bag replacement according to claim 2 or 3, characterized in that: The base tube has a gate at one end facing the ash hopper, and an insert plate is installed at the gate. The insert plate is used to open or close the communication hole between the observation tube and the ash hopper.

5. The observation device for initial treatment of online filter bag replacement according to claim 2, characterized in that: The protection valve is a butterfly valve.

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